Patent Publication Number: US-2023141026-A1

Title: Flow path switching device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application is a continuation application of International Patent Application No. PCT/JP2021/024288 filed on Jun. 28, 2021, which designated the U.S. and claims the benefit of priority from Japanese Patent Application No. 2020-125898 filed on Jul. 23, 2020. The entire disclosures of all of the above applications are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a flow path switching device. 
     BACKGROUND ART 
     In a fluid circuit, plural switch valves are arranged in order to realize a passage configuration according to an application. For example, in a water supply pump device, a first switch valve to a fifth switch valve are adopted to switch passage configurations, and the switching is performed among passage configurations of five patterns by controlling the operations of the first switch valve to the fifth switch valve. 
     SUMMARY 
     According to an aspect of the present disclosure, a flow path switching device for a fluid circuit in which a fluid circulates includes a main body member, a drive unit, a first cover member, and a second cover member. The main body member includes a first passage portion and a second passage portion. The first passage portion has a first passage connected to the fluid circuit, and the first passage has a groove shape where one surface of the main body member is opened. The second passage portion has a second passage that communicates with the first passage at a plurality of places and connected to the fluid circuit. The second passage has a groove shape where another surface of the main body member is opened. The drive unit drives valve body portions in conjunction to adjust a flow rate of a fluid passing through a communication passage that communicates the first passage and the second passage. The first cover member is attached to a surface of the first passage portion. The second cover member is attached to a surface of the second passage portion. The first passage portion, the second passage portion, and the drive unit are stacked in this order. The first cover member includes: a sealing portion and an opening. The sealing portion is arranged to seal an opened portion of the first passage, when the first cover member is attached to the surface of the first passage portion. The opening is arranged along an outer edge of the opened portion of the first passage and is formed to communicate a side of the main body member to an external side. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above object and other objects, features, and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. In the accompanying drawings: 
         FIG.  1    is a schematic configuration view of a flow path switching device according to a first embodiment; 
         FIG.  2    is a side view of the flow path switching device according to the first embodiment; 
         FIG.  3    is an overall configuration view of a heat medium circuit according to the first embodiment; 
         FIG.  4    is a plan view of a first passage portion of the flow path switching device; 
         FIG.  5    is a plan view of a configuration of a first passage of the flow path switching device; 
         FIG.  6    is a plan view of a second passage portion of the flow path switching device; 
         FIG.  7    is a plan view of a configuration of a second passage of the flow path switching device; 
         FIG.  8    is a cross-sectional view taken along a line VIII-VIII in  FIGS.  4  and  6   ; 
         FIG.  9    is an explanatory view illustrating a configuration of a heat medium check valve in the flow path switching device; 
         FIG.  10    is an explanatory view illustrating a schematic configuration of a heat medium three-way valve in the flow path switching device according to the first embodiment; 
         FIG.  11    is an explanatory view illustrating a schematic configuration of a heat medium on-off valve in a flow path switching device according to a second embodiment; 
         FIG.  12    is a cross-sectional view illustrating an internal configuration of the flow path switching device according to the second embodiment; 
         FIG.  13    is an explanatory view illustrating a schematic configuration of a heat medium switch valve in a flow path switching device according to a third embodiment; 
         FIG.  14    is a cross-sectional view illustrating an internal configuration of the flow path switching device according to the third embodiment; 
         FIG.  15    is a plan view of a first passage portion of a flow path switching device according to a fourth embodiment; and 
         FIG.  16    is a plan view of a second passage portion of the flow path switching device according to the fourth embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     To begin with, examples of relevant techniques will be described. In a conventional fluid circuit, plural switch valves are arranged in order to realize a passage configuration according to an application. For example, in a water supply pump device, a first switch valve to a fifth switch valve are adopted to switch passage configurations, and the switching is performed among passage configurations of five patterns by controlling the operations of the first switch valve to the fifth switch valve. 
     The first switch valve to the fifth switch valve are respectively connected via a large number of pipes and joints. Therefore, the configuration for switching the passages increases in size, which affects the space and weight of the entire device. 
     In addition, a drive unit related to the switching operation is required for each of the first switch valve to the fifth switch valve. Therefore, when the drive unit for each switch valve is taken into consideration, it is considered that there is room for further improvement in the space and weight of the configurations for switching the passages. 
     Then, in a case where a flow path switching device is manufactured by compactly arranging configurations for switching passages, each of the configurations is required to be accurately arranged. As a result, it is assumed that workability in the manufacturing may be deteriorated. For example, it is considered that fluid may leak from the passage depending on joining accuracy between members when the flow path switching device is manufactured. In order to cope with the leakage of the fluid, it is assumed that workability in the manufacturing may be deteriorated. The present disclosure provides a flow path switching device capable of switching a passage configuration of a fluid circuit by a compact configuration so as to improve the work efficiency in manufacturing. 
     A flow path switching device according to an aspect of the present disclosure switches a passage configuration of a fluid circuit in which a fluid circulates. The flow path switching device includes a main body member, a drive unit, a first cover member, and a second cover member. 
     The main body member includes a first passage portion and a second passage portion. The first passage portion has a first passage connected to the fluid circuit, and the first passage has a groove shape where one surface of the main body member is opened. The second passage portion has a second passage that communicates with the first passage at a plurality of places and connected to the fluid circuit. The second passage has a groove shape where another surface of the main body member is opened. 
     The drive unit drives valve body portions in conjunction adjusting a flow rate of a fluid passing through a communication passage that communicates the first passage and the second passage. The first cover member is attached to a surface of the first passage portion. The second cover member is attached to a surface of the second passage portion. The first passage portion, the second passage portion, and the drive unit are stacked and arranged in this order. 
     The first cover member includes: a sealing portion and an opening. The sealing portion is arranged to seal an opened portion of the first passage, when the first cover member is attached to the surface of the first passage portion. The opening is arranged along an outer edge of the opened portion of the first passage and is formed to communicate a side of the main body member to an external side. 
     According to the flow path switching device, the first passage portion, the second passage portion, and the drive unit are stacked and arranged in this order, so that it is possible to switch the passage configuration of the fluid circuit by a compact configuration. 
     Since the first cover member has the sealing portion and the opening, it is possible to easily locate a position where the fluid flowing through the first passage leaks from between the sealing portion of the first cover member and the first passage portion. Therefore, according to the flow path switching device, it is possible to improve workability in detecting leakage of the fluid and rejoining the sealing portion in a leak inspection, and it is possible to improve workability in manufacturing the flow path switching device. 
     Embodiments of the present disclosure will be described hereafter referring to drawings. In the embodiments, a part that corresponds to a matter described in a preceding embodiment may be assigned with the same reference numeral, and redundant explanation for the part may be omitted. When only a part of a configuration is described in an embodiment, another preceding embodiment may be applied to the other parts of the configuration. The parts may be combined even if it is not explicitly described that the parts can be combined. The embodiments may be partially combined even if it is not explicitly described that the embodiments can be combined, provided there is no harm in the combination. 
     (First Embodiment) 
     A schematic configuration of a flow path switching device  1  according to a first embodiment will be described with reference to the drawings. As illustrated in  FIG.  1   , the flow path switching device  1  according to the first embodiment constitutes a part of a heat medium circuit  50  as a fluid circuit, and switches a passage configuration of the heat medium circuit  50 , as described later. 
     The heat medium circuit  50  according to the first embodiment is mounted on an electric vehicle that obtains driving force for traveling from a motor generator. The heat medium circuit  50  is used in the electric vehicle when air-conditioning in the cabin of the vehicle, which is a space to be air-conditioned, is performed and when the temperatures of in-vehicle equipment (e.g., heat generating equipment  54  and a battery  57 ), which are objects whose temperatures are to be adjusted, are adjusted. That is, the heat medium circuit  50  according to the first embodiment constitutes, in an electric vehicle, a part of a vehicle air conditioner with a temperature adjustment function for the in-vehicle equipment. 
     In the heat medium circuit  50  of the first embodiment, the heat generating equipment  54  that generates heat during operation and the battery  57  that generates heat during charging and discharging are objects whose temperatures are to be adjusted. The heat generating equipment  54  includes a plurality of components. Specific examples of the components of the heat generating equipment  54  include a motor generator, a power control unit (so-called PCU), and a control device for an advanced driving assistance system (so-called ADAS). 
     The motor generator outputs driving force for traveling by being supplied with power, and generates regenerative power when the vehicle decelerates or the like. The PCU is obtained by integrating a transformer, a frequency converter, and the like in order to appropriately control the power to be supplied to each in-vehicle equipment. 
     The battery  57  is a secondary battery (e.g., a lithium ion battery) that stores the power to be supplied to the motor generator and the like. The battery  57  is an assembled battery formed by connecting a plurality of battery cells in series or in parallel. 
     As illustrated in  FIG.  1   , the components of the heat medium circuit  50  are connected to the flow path switching device  1  according to the first embodiment. Specifically, a heater core  51 , a heat medium-refrigerant heat exchanger  52 , a heating device  53 , the heat generating equipment  54 , a radiator  55 , a chiller  56 , the battery  57 , a first heat medium pump  58   a,  and a second heat medium pump  58   b  are connected to the flow path switching device  1  via heat medium pipes. 
     As illustrated in  FIG.  2   , the flow path switching device  1  includes a first cover member  20 , a main body member  5 , a second cover member  25 , and a drive unit  30 . In the flow path switching device  1 , the first cover member  20 , the main body member  5 , the second cover member  25 , and the drive unit  30  are stacked and arranged in this order in a stacking direction L. 
     In the flow path switching device  1  according to the first embodiment, the main body member  5  is formed in a block shape having a rectangular parallelepiped shape by a synthetic resin, as illustrated in  FIGS.  1  and  2   . On one surface (lower surface in  FIG.  2   ) side of the main body member  5 , a first passage  11 , having a groove shape, the one surface side of which is opened, is formed. 
     As illustrated in  FIGS.  2 ,  4 ,  8   , and the like, the first passage  11  functions as a pipeline through which a heat medium in the heat medium circuit  50  circulates by joining the first cover member  20  to the one surface of the main body member  5 . The one surface side of the main body member  5  constitutes a first passage portion  10 . 
     On another surface (upper surface in  FIG.  2   ) side positioned on the back side of the one surface of the main body member  5 , a second passage  16  having a groove shape, the another surface side of which is opened, is formed. As illustrated in  FIGS.  2  and  8   , the second passage  16  functions as a heat medium passage through which the heat medium in the heat medium circuit  50  circulates by joining the second cover member  25  and the like to the other surface of the main body member  5 . The other surface side of the main body member  5  constitutes a second passage portion  15 . 
     A plurality of valve body portions  73  are arranged inside the second passage  16 . In the first embodiment, the valve body portions  73  of a first heat medium three-way valve  70   a  to a third heat medium three-way valve  70   c,  a first heat medium on-off valve  80   a,  and a second heat medium on-off valve  80   b,  which will be described later, are arranged inside the second passage  16 . Each of the valve body portions  73  switches the flows of the heat medium in the first passage  11  and the second passage  16 , thereby changing the passage configuration of the heat medium circuit  50 . 
     In the main body member  5 , communication portions  13  formed to penetrate the one surface side and the other surface side are formed at a plurality of predetermined places. The communication portions connect between the first passage  11  and the second passage  16  such that the heat medium can circulate therebetween, and include a first communication portion  13   a,  a second communication portion  13   b,  and a third communication portion  13   c,  which will be described later. 
     As illustrated in  FIG.  2   , a plurality of connection ports, to which heat medium pipes of the heat medium circuit  50  are to be connected, are formed on the side surfaces of the main body member  5 . The flow path switching device  1  according to the first embodiment has a first connection port  35   a  to a tenth connection port  35   j,  to which the components of the heat medium circuit  50  are connected via the heat medium pipes. 
     As illustrated in  FIGS.  2  and  4   , the first cover member  20  is attached to the surface of the first passage portion  10  of the main body member  5 , and has a plurality of sealing portions  21  formed in plate shapes by a synthetic resin, and an opening  23 . The first cover member  20  according to the first embodiment has a first sealing portion  21   a  to a fifth sealing portion  21   e.  Each of the sealing portions  21  of the first cover member  20  is joined to one surface of the main body member  5  (lower surface, in  FIG.  2   , of the main body member  5 ) by vibration welding, laser welding, or the like. 
     As a result, the opened portion of the first passage  11  having a groove shape is sealed by the sealing portions  21  of the first cover member  20 , so that the first passage  11  functions as a pipeline through which the heat medium circulates. The outer edge of each of the sealing portions  21  is positioned, on the surface of the first passage portion  10 , outside the first passage  11  along the outer edge of the opened portion of the first passage  11 . 
     The opening  23  of the first cover member  20  passes through the first cover member  20  in the thickness direction and is formed to communicate the side of the main body member  5  to the outside of the flow path switching device  1 . Since the opening  23  is arranged along the outer edge of each of the sealing portions  21  of the first cover member  20 , the opening is arranged at a position along the outer edge of the opened portion of the first passage  11 . 
     As illustrated in  FIGS.  2  and  6   , the second cover member  25  is attached to the surface of the second passage portion  15  of the main body member  5 , and has a plurality of sealing portions  26  formed in plate shapes by a synthetic resin, and an opening  27 . The second cover member  25  according to the first embodiment has a first sealing portion  26   a  to a fourth sealing portion  26   d.  Each of the sealing portions  26  of the second cover member  25  is joined to the other surface of the main body member  5  (lower surface, in  FIG.  2   , of the main body member  5 ) by vibration welding, laser welding, or the like. 
     As a result, the opened portion of the second passage  16  having a groove shape is sealed by the sealing portions  26  of the second cover member  25 , so that the second passage  16  functions as a pipeline through which the heat medium circulates. The outer edge of each of the sealing portions  26  is positioned, on the surface of the second passage portion  15 , outside the second passage portion  15  along the outer edge of the opened portion of the second passage portion  15 . 
     The opening  27  of the second cover member  25  penetrates the second cover member  25  in the thickness direction and is formed to communicate the side of the main body member  5  and the outside of the flow path switching device  1 . Since the opening  27  is arranged along the outer edge of each of the sealing portions  26  of the second cover member  25 , the opening is arranged at a position along the outer edge of the opened portion of the second passage  16 . 
     As illustrated in  FIG.  2    and the like, the drive unit  30  is arranged on the other surface side of the main body member  5  having a block shape (i.e., on the surface side of the second passage portion  15 ). The drive unit  30  is configured such that an electromagnetic motor  32 , a link disc  33 , link levers  34 , and a non-illustrated drive control unit are housed in a casing  31 . The casing  31  protects the electromagnetic motor  32 , the link disc  33 , the link levers  34 , and the drive control unit from dust and water. 
     The electromagnetic motor  32  has a drive shaft  32   a  driven by power supply, and functions as a drive source for the valve body portions  73  of the first heat medium three-way valve  70   a  to the third heat medium three-way valve  70   c,  the first heat medium on-off valve  80   a,  and the second heat medium on-off valve  80   b,  which will be described later. Inside the casing  31  of the drive unit  30 , the electromagnetic motor  32  is attached to a motor holder  17  formed on the surface of the second passage portion  15  so as to be located at a predetermined position. 
     The link disc  33  and the link levers  34  constitute a transmission mechanism for transmitting the driving force generated by the electromagnetic motor  32  to the respective valve body portions  73 . 
     The link disc  33  is a disc-shaped member that is attached to the drive shaft  32   a  of the electromagnetic motor  32  and is arranged inside the casing  31 . The link levers  34  are rotatably attached to the link disc  33  so as to correspond to the valve body portions  73 . One end of each of the link levers  34  is attached to a rotating shaft  74   a  of each of the valve body portions  73 . 
     Therefore, when the driving force by the electromagnetic motor  32  is transmitted to the link disc  33  and the link disc rotates, each of the link levers  34  can be rotated, and each of the valve body portions  73  can be rotated around the rotating shaft  74   a.  As a result, the drive unit  30  can operate in conjunction the valve body portions  73  disposed in the flow path switching device  1 . 
     The drive control unit is an electronic control unit for controlling the operation of the flow path switching device  1 . Specifically, the drive control unit has a microcontroller, and controls the operations of the electromagnetic motor  32  and the transmission mechanism in accordance with control signals from a non-illustrated control device. 
     Next, configurations of the first passage  11  and the second passage  16  in the first embodiment will be described with reference to  FIGS.  3  to  7   . As described above, the heat medium circuit  50  is a heat medium circulation circuit that circulates cooling water as the heat medium. In the first embodiment, the passage configuration of the heat medium circuit  50  is switched as described later in order to perform air-conditioning in the cabin of the vehicle and temperature adjustment of the in-vehicle equipment (the heat generating equipment  54  and the battery  57 ). As the heat medium circulating in the heat medium circuit  50 , an ethylene glycol aqueous solution, which is an incompressible fluid, is adopted. 
     As illustrated in  FIG.  1    and the like, the inlet of a heat medium passage  52   b  of the heat medium-refrigerant heat exchanger  52  is connected to the first connection port  35   a  via the heat medium pipe. Here, the heat medium-refrigerant heat exchanger  52  is a component of the heat medium circuit  50 , and is one of the components of a refrigeration cycle  100 . The heat medium-refrigerant heat exchanger  52  includes a refrigerant passage  52   a  through which the refrigerant in the refrigeration cycle  100  circulates, and the heat medium passage  52   b  through which the heat medium in the heat medium circuit  50  circulates. 
     The heat medium-refrigerant heat exchanger  52  is formed of the same type of metal (in the first embodiment, an aluminum alloy) having an excellent heat transfer property, and the respective constituent members are integrated by brazing. As a result, the refrigerant circulating through the refrigerant passage  52   a  and the heat medium circulating through the heat medium passage  52   b  can exchange heat with each other. 
     In the first embodiment, the high-pressure refrigerant in the refrigeration cycle  100  circulates through the refrigerant passage  52   a  of the heat medium-refrigerant heat exchanger  52 , so that the heat medium-refrigerant heat exchanger  52  functions as a radiator that dissipates heat of the high-pressure refrigerant to the heat medium in the heat medium passage  52   b.  As a result, the heat medium-refrigerant heat exchanger  52  can heat the heat medium with the heat of the high-pressure refrigerant. 
     The heating device  53  is connected to the outlet of the heat medium passage  52   b  of the heat medium-refrigerant heat exchanger  52  via the heat medium pipe. The heating device  53  has a heating passage and a heat generator, and heats the heat medium flowing into the heater core  51  by the power supplied from a non-illustrated control device. The calorific value of the heating device  53  can be arbitrarily adjusted by controlling the power from the control device. 
     The heating passage of the heating device  53  is a passage through which the heat medium circulates. The heat generator heats the heat medium circulating through the heating passage by being supplied with power. Specifically, a PTC element or a nichrome wire can be adopted as the heat generator. 
     The heat medium inlet side of the heater core  51  is connected to the outlet side of the heating passage of the heating device  53  via the heat medium pipe. The heater core  51  is a heat exchanger that exchanges heat between blown air blown from a non-illustrated cabin blower and the heat medium. Therefore, the heater core  51  can heat the blown air by using, as a heat source, the heat of the heat medium heated by the heat medium-refrigerant heat exchanger  52 , the heating device  53 , or the like. 
     The heater core  51  is arranged on the downstream side of a cabin evaporator constituting the refrigeration cycle  100  in the casing of a cabin air-conditioning unit mounted on the electric vehicle. Heating of and dehumidification and heating of the cabin of the electric vehicle can be realized by heating the blown air by the heater core  51 . The third connection port  35   c  is connected to the heat medium outlet side of the heater core  51  via the heat medium pipe. As illustrated in  FIG.  7   , the third connection port  35   c  constitutes one end portion of the second passage  16 . 
     A heat medium passage  54   a  of the heat generating equipment  54  is connected to the third connection port  35   c  constituting one end portion of the first passage  11  via the heat medium pipe. The heat medium passage  54   a  of the heat generating equipment  54  is formed in a housing portion, a case, or the like forming an outer shell of the heat generating equipment  54 . 
     The heat medium passage  54   a  of the heat generating equipment  54  is a heat medium passage for adjusting the temperature of the heat generating equipment  54  by circulating the heat medium. In other words, the heat medium passage  54   a  of the heat generating equipment  54  functions as a temperature adjusting unit that adjusts the temperature of the heat generating equipment  54  by heat exchange with the heat medium circulating in the heat medium circuit  50 . 
     The fourth connection port  35   d  is connected to the other end side of the heat medium passage  54   a  of the heat generating equipment  54  via the heat medium pipe. As illustrated in  FIG.  7   , the fourth connection port  35   d  constitutes the one end portion of the second passage  16 . 
     The outlet of the heat medium passage  57   a  of the battery  57  is connected to the fifth connection port  35   e  constituting the one end portion of the second passage  16  via the heat medium pipe. The battery  57  is a secondary battery (e.g., a lithium ion battery) that stores the power to be supplied to the motor generator and the like. The battery  57  is an assembled battery formed by connecting a plurality of battery cells in series or in parallel. 
     The heat medium passage  57   a  of the battery  57  is a heat medium passage for adjusting the temperature of the battery  57  by circulating the heat medium, and constitutes a heat exchanger unit for equipment. That is, the heat medium passage  57   a  of the battery  57  is connected such that the heat medium in the heat medium circuit  50  can flow in and out. The outlet of a heat medium passage  56   b  of the chiller  56  is connected to the inlet of the heat medium passage  57   a  of the battery  57  via the heat medium pipe. 
     The chiller  56  includes a heat medium-refrigerant heat exchanger, and includes a refrigerant passage  56   a  through which the low-pressure refrigerant in the refrigeration cycle  100  passes, and the heat medium passage  56   b  through which the heat medium circulating in the heat medium circuit  50  passes. The chiller  56  functions as a heat absorber that causes the low-pressure refrigerant to absorb the heat of the heat medium circulating through the heat medium passage  52   b,  and can cool the heat medium passing through the heat medium passage  56   b.    
     The sixth connection port  35   f  is connected to the inlet of the heat medium passage  56   b  of the chiller  56  via the heat medium pipe. As illustrated in  FIG.  5   , the sixth connection port  35   f  constitutes the one end portion of the first passage  11 . 
     The discharge port of the second heat medium pump  58   b  is connected to the seventh connection port  35   g  constituting the one end portion of the second passage  16  via the heat medium pipe. The second heat medium pump  58   b  is an electric pump whose rotation speed (i.e., pumping capability) is controlled by a control voltage output from a non-illustrated control device. Therefore, the second heat medium pump  58   b  pumps the heat medium toward the seventh connection port  35   g.  The suction port of the second heat medium pump  58   b  is connected to the outlet of a second reserve tank  59   b  via the heat medium pipe. 
     The second reserve tank  59   b  is one of heat medium storage portions that stores the heat medium surplus in the heat medium circuit  50 . In the case of a passage configuration through the second heat medium pump  58   b,  the second reserve tank  59   b  suppresses a decrease in the liquid amount of the heat medium circulating in the heat medium circuit  50 . The second reserve tank  59   b  has a heat medium supply port for supplying the heat medium if the amount of the heat medium in the heat medium circuit  50  becomes insufficient. 
     A second attachment port  22   b  formed in the first cover member  20  is connected to the inlet of the second reserve tank  59   b  via a second hose member  36   b  having flexibility. The second attachment port  22   b  is formed in the first cover member  20  and communicates with the first passage  11 . Therefore, the heat medium flowing through the first passage  11  is supplied to the second reserve tank  59   b  via the second hose member  36   b.    
     The discharge port of the first heat medium pump  58   a  is connected to an eighth connection portion  90   h  constituting the one end portion of the first passage  11  via the heat medium pipe. The first heat medium pump  58   a  is an electric pump similar to the second heat medium pump  58   b  described above. Therefore, the first heat medium pump  58   a  pumps the heat medium toward the eighth connection port  35   h.  The suction port of the first heat medium pump  58   a  is connected to the outlet of the first reserve tank  59   a  via the heat medium pipe. 
     The first reserve tank  59   a  is one of the heat medium storage portions to store the heat medium surplus in the heat medium circuit  50 . The first reserve tank  59   a  suppresses a decrease in the liquid amount of the heat medium circulating in the heat medium circuit  50 , in the case of a passage configuration through the first heat medium pump  58   a.  The first reserve tank  59   a  and the second reserve tank  59   b  are selectively used depending on the passage configuration of the heat medium circuit  50 . The first reserve tank  59   a  has a heat medium supply port for replenishing the heat medium if the amount of the heat medium in the heat medium circuit  50  becomes insufficient. 
     A first attachment port  22   a  formed in the first cover member  20  is connected to the inlet of the first reserve tank  59   a  via a first hose member  36   a  having flexibility. The first attachment port  22   a  is formed in the first cover member  20  and communicates with the first passage  11 . Therefore, the heat medium flowing through the first passage  11  is supplied to the first reserve tank  59   a  via the first hose member  36   a.    
     The outlet of the radiator  55  is connected to the ninth connection port  35   i  constituting the one end portion of the first passage  11  via the heat medium pipe. The radiator  55  is a heat exchanger that exchanges heat between the heat medium circulating inside and outside air. Therefore, the radiator  55  dissipates the heat of the heat medium passing through the inside to the outside air. 
     The radiator  55  is arranged on the front side of the room of a drive device in the electric vehicle. Therefore, the radiator  55  can also be configured integrally with an outdoor heat exchanger. The tenth connection port  35   j  is connected to the inlet of the radiator  55  via the heat medium pipe. As illustrated in  FIG.  5   , the tenth connection port  35   j  constitutes the one end portion of the first passage  11 . 
     As illustrated in  FIGS.  3  and  4   , the first passage  11  extending from the first connection port  35   a  constitutes a first connection portion  90   a  connected to the first passage  11  extending from one of the outlets of the first heat medium three-way valve  70   a  and to the first passage  11  extending from the outlet of a first heat medium check valve  60   a.  The first heat medium check valve  60   a  allows the heat medium to flow from the side of an eleventh connection portion  90   k  to be described later to the side of the first connection portion  90   a,  and prohibits the heat medium from flowing from the first connection portion  90   a  to the eleventh connection portion  90   k.    
     The first passage  11  extending from the sixth connection port  35   f  constitutes the eighth connection portion  90   h  connected to the first passage  11  extending from the other of the outlets of the first heat medium three-way valve  70   a  and to the first passage  11  extending from the outlet of a fourth heat medium check valve  60   d.  The fourth heat medium check valve  60   d  allows the heat medium to flow from the side of a tenth connection portion  90   j  to be described later to the side of the eighth connection portion  90   h,  and prohibits the heat medium from flowing from the eighth connection portion  90   h  to the tenth connection portion  90   j.    
     As illustrated in  FIGS.  3  and  7   , the second passage  16  extending from the seventh connection port  35   g  is connected to the inlet of the first heat medium three-way valve  70   a.  Therefore, the first heat medium three-way valve  70   a  is a three-way flow control valve capable of adjusting a flow rate ratio between the flow rate of, of the heat medium discharged from the first heat medium pump  58   a,  the heat medium flowing out of one of the outlets and the flow rate of the heat medium flowing out of the other of the outlets. The operation of the first heat medium three-way valve  70   a  is controlled by controlling the drive unit  30  by a non-illustrated control device. 
     Furthermore, the first heat medium three-way valve  70   a  can cause the total flow rate of the heat medium discharged from the first heat medium pump  58   a  to flow out to either of the two outlets. As a result, the first heat medium three-way valve  70   a  can switch the passage configuration of the heat medium circuit  50 . 
     The heat medium flowing in from the inlet of the first heat medium three-way valve  70   a  passes through a communication passage in the course of flowing through the first heat medium three-way valve  70   a  toward the outlet, and flows out from the second passage  16  to the first passage  11 . Specific configurations of heat medium three-way valves  70  including the first heat medium three-way valve  70   a  will be described later with reference to the drawings. 
     As illustrated in  FIGS.  3  and  7   , the second passage  16  extending from the third connection port  35   c  is connected to the inlet of a second heat medium three-way valve  70   b.  Therefore, the second heat medium three-way valve  70   b  can adjust a flow rate ratio between the flow rate of, of the heat medium flowing out of the heater core  51 , the heat medium flowing out of one of the outlets and the flow rate of the heat medium flowing out of the other of the outlets. 
     Furthermore, the second heat medium three-way valve  70   b  can cause the total flow rate of the heat medium flowing out of the heater core  51  to flow out to either of the two outlets. As a result, the second heat medium three-way valve  70   b  can switch the passage configuration of the heat medium circuit  50 . 
     The heat medium flowing in from the inlet of the second heat medium three-way valve  70   b  passes through a communication passage in the course of flowing through the second heat medium three-way valve  70   b  toward the outlet, and flows out from the second passage  16  to the first passage  11 . 
     As illustrated in  FIGS.  3  and  5   , the first passage  11  extending from the second connection port  35   b  constitutes a fifth connection portion  90   e  connected to the first passage  11  extending from the outlet of a second heat medium check valve  60   b  and to the first passage  11  extending from one of the outlets of the second heat medium three-way valve  70   b.  The second heat medium check valve  60   b  allows the heat medium to flow from the side of the eleventh connection portion  90   k  to be described later to the side of the fifth connection portion  90   e,  and prohibits the heat medium from flowing from the fifth connection portion  90   e  to the eleventh connection portion  90   k.    
     Here, the first passage  11  extending from the other of the outlets of the second heat medium three-way valve  70   b  constitutes a second connection portion  90   b  connected to the first passage  11  extending from the outlet of a third heat medium check valve  60   c  and to the first passage  11  extending from the outlet of a fifth heat medium check valve  60   e.  The third heat medium check valve  60   c  allows the heat medium to flow from the side of a seventh connection portion  90   g  to the side of a sixth connection portion  90   f,  and prohibits the heat medium from flowing from the sixth connection portion  90   f  to the seventh connection portion  90   g.    
     As illustrated in  FIG.  4   , the opened portion of the first passage  11  including the second connection portion  90   b  is sealed by the second sealing portion  21   b  of the first cover member  20 . In the second sealing portion  21   b,  the first attachment port  22   a,  penetrating, in the thickness direction, the second sealing portion  21   b  having a plate shape, is formed. 
     One end portion of the first hose member  36   a,  formed of a flexible hose or the like, is connected to the first attachment port  22   a.  As described above, the other end portion of the first hose member  36   a  is connected to the inlet of the first reserve tank  59   a.  As a result, the heat medium flowing through the first passage  11  is supplied to the first reserve tank  59   a  via the first hose member  36   a.    
     As illustrated in  FIG.  3   , the first hose member  36   a  is connected, at the first attachment port  22   a,  to the first passage  11  extending from the other of the outlets of the second heat medium three-way valve  70   b  and to the first passage  11  extending from the outlet of the third heat medium check valve  60   c.  Therefore, the first attachment port  22   a  constitutes the sixth connection portion  90   f.    
     As illustrated in  FIG.  7   , the second passage  16  extending from the fourth connection port  35   d  is connected to the second passage  16  extending from one of the inflow outlets of the first heat medium on-off valve  80   a,  and has the first communication portion  13   a.  Here, the communication portion  13  including the first communication portion  13   a  is an opening that communicates between the first passage  11  and the second passage  16  such that the heat medium can flow in and out. As illustrated in  FIG.  5   , the first passage  11 , in which the first communication portion  13   a  is formed, extends from the inlet of the fifth heat medium check valve  60   e.    
     That is, the second passage  16  extending from the fourth connection port  35   d  constitutes a fourth connection portion  90   d  connected to the second passage  16  extending from one of the inflow outlets of the first heat medium on-off valve  80   a  and to the second passage  16  extending from the first communication portion  13   a.  The fifth heat medium check valve  60   e  allows the heat medium to flow from the side of the fourth connection portion  90   d  to the side of the second connection portion  90   b  to be described later, and prohibits the heat medium from flowing from the second connection portion  90   b  to the fourth connection portion  90   d.    
     The first heat medium on-off valve  80   a  has a communication passage that communicates the first passage  11  and the second passage  16 , and opens and closes the communication passage by the operations of the valve body portions  73  to control the flow of the heat medium from one of the inflow outlets to the other. Therefore, the heat medium flowing in from one of the inflow outlets of the first heat medium on-off valve  80   a  passes through the communication passage in the course of flowing through the first heat medium on-off valve  80   a  toward the other of the inflow outlets, and flows out from the second passage  16  to the first passage  11 . 
     As illustrated in  FIG.  5   , the first passage  11  extending from the other of the inflow outlets of the first heat medium on-off valve  80   a  is connected to the first passage  11  extending from the other of the inflow outlets of the second heat medium on-off valve  80   b,  and has the third communication portion  13   c.    
     As illustrated in  FIGS.  3  and  7   , the second passage  16  extending from the fifth connection port  35   e  is connected to the second passage  16  extending from one of the inflow outlets of the second heat medium on-off valve  80   b,  and has the second communication portion  13   b.  As illustrated in  FIG.  5   , the first passage  11 , in which the second communication portion  13   b  is formed, extends from the inlet of the third heat medium check valve  60   c.    
     That is, the second passage  16  extending from the fifth connection port  35   e  constitutes the seventh connection portion  90   g  connected to the second passage  16  extending from one of the inflow outlets of the second heat medium on-off valve  80   b  and to the second passage  16  extending from the second communication portion  13   b.    
     The first passage  11  extending from the eighth connection port  35   h  is connected to the first passage  11  extending from the inlet of the second heat medium check valve  60   b  and to the other first passage  11  to constitute the tenth connection portion  90   j  and the eleventh connection portion  90   k.    
     Specifically, the tenth connection portion  90   j  includes the first passage  11  extending from the eighth connection port  35   h,  the first passage  11  extending from the inlet of the second heat medium check valve  60   b,  and the first passage  11  extending from the inlet of the fourth heat medium check valve  60   d.    
     The eleventh connection portion  90   k  includes the first passage  11  extending from the eighth connection port  35   h,  the first passage  11  extending from the inlet of the second heat medium check valve  60   b,  and the first passage  11  extending from the inlet of the first heat medium check valve  60   a.    
     As illustrated in  FIGS.  3  and  5   , the first passage  11  extending from the ninth connection port  35   i  is connected to the first passage  11  extending from one of the outlets of the third heat medium three-way valve  70   c.  The first passage  11  extending from the tenth connection port  35   j  is connected to the first passage  11  extending from the other of the outlets of the third heat medium three-way valve  70   c.    
     As illustrated in  FIG.  4   , the opened portions of the first passage  11  extending from the ninth connection port  35   i  and the first passage  11  extending from the tenth connection port  35   j  are sealed by the fourth sealing portion  21   d  of the first cover member  20 . The second attachment port  22   b,  penetrating, in the thickness direction, the fourth sealing portion  21   d  having a plate shape, is formed in a portion of the fourth sealing portion  21   d  that corresponds to the first passage  11  extending from the ninth connection port  35   i.    
     One end portion of the second hose member  36   b,  formed of a flexible hose or the like, is connected to the second attachment port  22   b.  As described above, the other end portion of the second hose member  36   b  is connected to the inlet of the second reserve tank  59   b.    
     That is, the second hose member  36   b  is connected, at the second attachment port  22   b,  to the first passage  11  extending from the ninth connection port  35   i  and to the first passage  11  extending from one of the outlets of the third heat medium three-way valve  70   c,  as illustrated in  FIG.  3   . Therefore, the second attachment port  22   b  constitutes a third connection portion  90   c.    
     As illustrated in  FIGS.  3  and  7   , the third communication portion  13   c  is formed in the second passage  16  extending from the inlet of the third heat medium three-way valve  70   c.  Similarly to the first communication portion  13   a  and the like described above, the third communication portion  13   c  communicates the first passage  11  and the second passage  16 . Therefore, on the side of the first passage portion  10 , the first passage  11  extending from the third communication portion  13   c  extends. The first passage  11  extending from the third communication portion  13   c  constitutes a ninth connection portion  90   i  connected to the first passage  11  extending from the other of the inflow outlets of the first heat medium on-off valve  80   a  and to the first passage  11  extending from the other of the inflow outlets of the second heat medium on-off valve  80   b.    
     Specific configurations of heat medium check valves  60 , including the first heat medium check valve  60   a  to the fifth heat medium check valve  60   e,  and of the heat medium three-way valves  70 , including the first heat medium three-way valve  70   a  to the third heat medium three-way valve  70   c,  will be described later with reference to the drawings. The same applies to heat medium on-off valves  80  including the first heat medium on-off valve  80   a  to the second heat medium on-off valve  80   b.    
     According to the flow path switching device  1  of the first embodiment, the passage configuration of the heat medium circuit  50  can be switched to various aspects by controlling the operations of the heat medium three-way valves  70  and of the heat medium on-off valves  80 . 
     For example, the flow path switching device  1  causes, in the heat medium circuit  50 , the heat medium to circulate through the first heat medium pump  58   a,  the first heat medium three-way valve  70   a,  the heat medium-refrigerant heat exchanger  52 , the heating device  53 , and the heater core  51  in this order. Then, the heat medium flowing out of the heater core  51  is caused to flow and circulate to the second heat medium three-way valve  70   b,  the heat generating equipment  54 , the fifth heat medium check valve  60   e,  the first reserve tank  59   a,  and the first heat medium pump  58   a.    
     According to the heat medium circuit  50  having this passage configuration, the heat medium heated by waste heat from the heat generating equipment  54  can be caused to flow into the heater core  51 , so that heating of the cabin of the vehicle using the waste heat from the heat generating equipment  54  can be realized. 
     In addition, the flow path switching device  1  causes, in the heat medium circuit  50 , the heat medium to flow through the second heat medium pump  58   b,  the first heat medium check valve  60   a,  the heat medium-refrigerant heat exchanger  52 , the heating device  53 , the heater core  51 , the second heat medium three-way valve  70   b,  and the heat generating equipment  54  in this order. Then, the heat medium flowing out of the heat generating equipment  54  is caused to flow through the first heat medium on-off valve  80   a,  the third heat medium three-way valve  70   c,  the radiator  55 , the second reserve tank  59   b,  and the second heat medium pump  58   b  in this order, thereby circulating the heat medium. 
     As a result, a circulation route for the heat medium that passes through the heat generating equipment  54 , the heat medium-refrigerant heat exchanger  52 , the heater core  51 , and the radiator  55  is formed. It is possible to realize heating of the cabin of the vehicle using the heat of the high-pressure refrigerant in the refrigeration cycle  100  or exhaust heat from the heat generating equipment  54 . In addition, the radiator  55  can dissipate excess heat from the heat medium to the outside air, so that temperature adjustment in the heating can also be performed. 
     At this time, the flow path switching device  1  causes, in the heat medium circuit  50 , the heat medium to flow and circulate through the first heat medium pump  58   a,  the first heat medium three-way valve  70   a,  the chiller  56 , the battery  57 , the third heat medium check valve  60   c,  the first reserve tank  59   a,  and the first heat medium pump  58   a  in this order. 
     As a result, the battery  57  can be cooled by using the heat medium cooled by the chiller  56 . A circulation route for the heat medium that passes through the heat generating equipment  54 , the heat medium-refrigerant heat exchanger  52 , and the heater core  51  and a circulation route for the heat medium that passes through the chiller  56  and the battery  57  can be configured in parallel. Therefore, according to the heat medium circuit  50  having this passage configuration, it is possible to perform heating of the cabin of the vehicle using waste heat or the like from the heat generation equipment  54  and simultaneously to cool the battery  57  using the refrigeration cycle  100 . 
     Furthermore, the flow path switching device  1  causes the heat medium to circulate through the second heat medium pump  58   b,  the fourth heat medium check valve  60   d,  the chiller  56 , the battery  57 , the second heat medium on-off valve  80   b,  the third heat medium three-way valve  70   c,  the radiator  55 , the second reserve tank  59   b,  and the second heat medium pump  58   b  in this order. At the same time, the heat medium is caused to circulate through the second heat medium pump  58   b,  the heat generating equipment  54 , the first heat medium on-off valve  80   a,  the third heat medium three-way valve  70   c,  the radiator  55 , the second reserve tank  59   b,  and the second heat medium pump  58   b  in this order. 
     According to the heat medium circuit  50  having this configuration, a circulation route for the heat medium that passes through the chiller  56  and the battery  57  and a circulation route for the heat medium that circulates through the heat generating equipment  54  and the radiator  55  can be configured in parallel. As a result, the heat medium circuit  50  cools the battery  57  by the refrigeration cycle  100 , and simultaneously can realize cooling of the heat generating equipment  54  by dissipating heat to the outside air. 
     Subsequently, a specific configuration of the first cover member  20  of the flow path switching device  1  according to the first embodiment will be described with reference to  FIGS.  4 ,  5 , and  8   . As described above, the first cover member  20  is attached to the surface of the first passage portion  10  of the main body member  5  by vibration welding, laser welding, or the like. The first cover member  20  includes the sealing portions  21  for sealing the opened portion of the first passage  11  formed in a groove shape, and the opening  23 . 
     As illustrated in  FIG.  4   , the first cover member  20  has the first sealing portion  21   a  to the fifth sealing portion  21   e  as the sealing portions  21 . Each of the sealing portions  21  is attached, on the surface of the first passage portion  10 , to seal the opened portion of the first passage  11 . 
     Specifically, with reference to  FIGS.  4  and  5   , the first sealing portion  21   a  of the first cover member  20  is attached to seal the opened portions of the first passage  11  extending from the first connection port  35   a  and the first passage  11  extending from the sixth connection port  35   f.  The outer edge of the first sealing portion  21   a  is arranged along the outside of the opened portions of the first passage  11  extending from the first connection port  35   a  and the first passage  11  extending from the sixth connection port  35   f.    
     A part of the outer edge of the first sealing portion  21   a  is arranged on a joint surface  12   b  formed on a reinforcing portion  12  of the first heat medium check valve  60   a  and the fourth heat medium check valve  60   d.  The configurations of the first heat medium check valve  60   a  and the like will be described later. 
     The second sealing portion  21   b  of the first cover member  20  is attached to seal the opened portions of the first passage  11  extending from the second connection port  35   b  and the first passage  11  extending from the other of the outlets of the second heat medium three-way valve  70   b.  The outer edge of the second sealing portion  21   b  is arranged along the outside of the opened portions of the first passage  11  extending from the second connection port  35   b  and the first passage  11  extending from the other of the outlets of the second heat medium three-way valve  70   b.  A part of the outer edge of the second sealing portion  21   b  is arranged on the joint surface  12   b  formed on the reinforcing portion  12  of the second heat medium check valve  60   b.    
     As illustrated in  FIGS.  4  and  5   , the third sealing portion  21   c  of the first cover member  20  is attached to seal the opened portion of the first passage  11  extending from the eighth connection port  35   h.  The outer edge of the third sealing portion  21   c  is arranged along the outside of the opened portion of the first passage  11  extending from the eighth connection port  35   h.  A part of the outer edge of the third sealing portion  21   c  is arranged on a joint surface formed on the reinforcing portion  12  of the first heat medium check valve  60   a,  the second heat medium check valve  60   b,  and the fourth heat medium check valve  60   d.    
     The fourth sealing portion  21   d  of the first cover member  20  is attached to seal the opened portions of the first passage  11  extending from the ninth connection port  35   i  and the first passage  11  extending from the tenth connection port  35   j.  The outer edge of the fourth sealing portion  21   d  is arranged along the outside of the opened portions of the first passage  11  extending from the ninth connection port  35   i  and the first passage  11  extending from the tenth connection port  35   j.    
     The fifth sealing portion  21   e  of the first cover member  20  is attached to seal the opened portion of the first passage  11  extending from the third communication portion  13   c.  The outer edge of the fifth sealing portion  21   e  is arranged along the outside of the opened portion of the first passage  11  extending from the third communication portion  13   c.    
     As a result, in the flow path switching device  1  according to the first embodiment, the opened portions of all of the first passages  11  formed in the first passage portion  10  are sealed by the sealing portions  21  of the first cover member  20 . That is, in the flow path switching device  1 , the first passages  11  formed in the first passage portion  10  can be configured as a tubular passage through which the heat medium circulates. 
     As illustrated in  FIG.  8   , the opening  23  penetrates in the thickness direction of the first cover member  20 , and is opened to communicate the side of the main body member  5  and the external side of the flow path switching device  1 . 
     As illustrated in  FIG.  4   , the opening  23  is arranged along the outer edge of the opened portion of each of the first passages  11 . Therefore, in the first cover member  20 , the first sealing portion  21   a  to the fifth sealing portion  21   e  are divided by the opening  23 . 
     Here, when the flow path switching device  1  is manufactured, a leak inspection for detecting leakage of the heat medium from the first passage  11  is performed. When leakage of the heat medium from the first passage  11  is detected in the leak inspection, it is necessary, in order to ensure the airtightness of the first passage  11 , to remove the first cover member  20  from the first passage portion  10  and to attach the first cover member again so as to ensure the airtightness. 
     For example, when the first cover member  20 , having a plate shape that is of the same size as the surface of the first passage portion  10 , is adopted, it has been difficult in the leak inspection to locate the position of leakage even if the leakage of the heat medium from between the first passage  11  and the first cover member  20  is detected. Since the position of the leakage cannot be located, it has been necessary to remove the entire first cover member  20  having a plate shape and to reattach it to the surface of the first passage portion  10 . 
     In this regard, according to the flow path switching device  1  of the first embodiment, the first cover member  20  has the sealing portions  21  and the opening  23 , so that, in the leak inspection, the position of the leakage of the heat medium from the inside of the first passage  11  can be located by using the opening  23 . As a result, the work of reattaching the first cover member  20 , which is performed to ensure the airtightness of the first passage  11 , is reduced to the minimum necessary, and workability until the completion of the manufacturing can be improved. 
     In addition, in the first cover member  20  of the flow path switching device  1 , the sealing portions  21  are divided by the opening  23 , so that it is possible to locate the position of the leakage detected in the leak inspection at least in units of the sealing portions  21 . As a result, it is possible to perform the work of reattaching the first cover member  20 , accompanying the detection of the leakage, in units of the sealing portions  21 , and it is possible to reduce waste in the work of the reattachment. 
     Next, a specific configuration of the second cover member  25  of the flow path switching device  1  according to the first embodiment will be described with reference to  FIGS.  6  to  8   . As described above, the second cover member  25  is attached to the surface of the second passage portion  15  of the main body member  5  by vibration welding, laser welding, or the like. The second cover member  25  includes the sealing portions  26  for sealing the opened portions of the second passage  16  formed in a groove shape, and the opening  27 . 
     As illustrated in  FIG.  6   , the second cover member  25  includes the first sealing portion  26   a  to the fourth sealing portion  26   d  as the sealing portions  26 . Each of the sealing portions  26  is attached, on the surface of the second passage portion  15 , to seal the opened portion of the second passage portion  15 . 
     Specifically, with reference to  FIGS.  6  and  7   , the first sealing portion  26   a  of the second cover member  25  is attached to seal the opened portion of the second passage  16  extending from the third connection port  35   c.  Therefore, the first sealing portion  26   a  is arranged to seal the inlet side of the second heat medium three-way valve  70   b.  The outer edge of the first sealing portion  26   a  is arranged along the outside of the opened portion of the second passage  16  extending from the third connection port  35   c.    
     The second sealing portion  26   b  of the second cover member  25  is attached to seal the opened portion of the second passage  16  extending from the seventh connection port  35   g.  Therefore, the second sealing portion  26   b  is arranged to seal the inlet side of the first heat medium three-way valve  70   a.  The outer edge of the second sealing portion  26   b  is arranged along the outside of the opened portion of the second passage  16  extending from the seventh connection port  35   g.    
     The third sealing portion  26   c  of the second cover member  25  is attached to seal the opened portions of the second passage  16  extending from the fourth connection port  35   d  and the second passage  16  extending from the third communication portion  13   c.  Therefore, the third sealing portion  26   c  is arranged to seal one side of the inflow outlets of the first heat medium on-off valve  80   a  and the inlet side of the third heat medium three-way valve  70   c.  The outer edge of the third sealing portion  26   c  is arranged along the outside of the opened portions of the second passage  16  extending from the fourth connection port  35   d  and the second passage  16  extending from the third communication portion  13   c.    
     Furthermore, the fourth sealing portion  26   d  of the second cover member  25  is attached to seal the opened portion of the second passage  16  extending from the fifth connection port  35   e.  Therefore, the fourth sealing portion  26   d  is arranged to seal one side of the inflow outlets of the second heat medium on-off valve  80   b.  The outer edge of the fourth sealing portion  26   d  is arranged along the outside of the opened portion of the second passage  16  extending from the fifth connection port  35   e.    
     As a result, in the flow path switching device  1  according to the first embodiment, the opened portions of all of the second passages  16  formed in the second passage portion  15  are sealed by the sealing portions  26  of the second cover member  25 . That is, in the flow path switching device  1 , the second passages  16  formed in the second passage portion  15  can be configured as a tubular passage through which the heat medium circulates. 
     In the second cover member  25 , the opening  27  penetrates in the thickness direction of the second cover member  25 , and is opened to communicate the side of the main body member  5  and the external side of the flow path switching device  1 , as illustrated in  FIGS.  7  and  8   . The opening  27  of the second cover member  25  is arranged along the outer edge of the opened portion of each of the second passages  16 . Therefore, in the second cover member  25 , the first sealing portion  26   a  to the fourth sealing portion  26   d  are divided by the opening  27 . 
     Here, when the flow path switching device  1  is manufactured, a leak inspection for detecting leakage of the heat medium from the second passage  16  is performed similarly to the first passage  11 . When leakage of the heat medium from the second passage  16  is also detected in the leak inspection from the second passage  16 , it is necessary, in order to ensure the airtightness of the second passage  16 , to remove the second cover member  25  from the main body member  5  and to reattach the second cover member so as to ensure the airtightness. 
     For example, when the second cover member  25 , having a plate shape that is of the same size as the surface of the second passage portion  15 , is adopted, it has been difficult in the leak inspection to locate the position of leakage even if the leakage of the heat medium from between the second passage  16  and the second cover member  25  is detected. Since the position of the leakage position cannot be located, it has been necessary to remove the entire second cover member  25  having a plate shape and to reattach it to the surface of the second passage portion  15 . 
     In this regard, according to the flow path switching device  1  of the first embodiment, the second cover member  25  has the sealing portions  26  and the opening  27 , so that, in the leak inspection, the position of the leakage of the heat medium from the inside of the second passage  16  can be located by using the opening  27 . As a result, the work of reattaching the second cover member  25 , which is performed to ensure the airtightness of the second passage  16 , is reduced to the minimum necessary, and workability until the completion of the manufacturing can be improved. 
     In addition, in the second cover member  25  of the flow path switching device  1 , the sealing portions  26  are divided by the opening  27 , so that it is possible to locate the position of the leakage detected in the leak inspection at least in units of the sealing portions  26 . As a result, it is possible to perform the work of reattaching the second cover member  25 , accompanying the detection of the leakage, in units of the sealing portions  26 , and it is possible to reduce waste in the work of the reattachment. 
     As illustrated in  FIGS.  6  and  7   , the motor holder  17  is formed on the surface of the second passage portion  15 . The motor holder  17  is configured to hold the electromagnetic motor  32  constituting the drive unit  30  with respect to the second passage portion  15 , and has a plurality of positioning pins  17   a.    
     Each of the positioning pins  17   a  is arranged at a position of the second passage portion  15  that corresponds to the opening  27  when the second cover member  25  is attached. Each of the positioning pins  17   a  is inserted into a holding hole (not illustrated) formed in the body of the electromagnetic motor  32 , which determines a relative positional relationship of the electromagnetic motor  32  with respect to the main body member  5 . 
     As a result, the electromagnetic motor  32  is arranged, on the surface of the second passage portion  15 , inside the opening  27  of the second cover member  25 . Since the relative positional relationship of the electromagnetic motor  32  with respect to the main body member  5  is determined by the motor holder  17 , the relative position of the drive shaft  32   a  of the electromagnetic motor  32  with respect to the main body member  5  can be accurately determined. 
     In the flow path switching device  1 , the driving force of the electromagnetic motor  32  is transmitted from the drive shaft  32   a  to the valve body portions  73  of the respective heat medium three-way valve  70  and heat medium on-off valve  80  via the link disc  33  and the link levers  34 , as illustrated in  FIGS.  2  and  8   . 
     As described above, the second passages  16 , including the first heat medium three-way valve  70   a  to the third heat medium three-way valve  70   c,  the first heat medium on-off valve  80   a,  and the second heat medium on-off valve  80   b,  are sealed by the respective sealing portions  26  of the second cover member  25 . Therefore, the link levers  34  connected to the valve body portions  73  are connected to the link disc  33  arranged inside the casing  31  of the drive unit  30  via the respective sealing portions  26 . 
     In this regard, in the flow path switching device  1  according to the first embodiment, the respective sealing portions  26  of the second cover member  25  are divided by the opening  27 , so that the relative positional relationships of the respective link levers  34  with respect to the main body member  5  can be adjusted to appropriate positions. 
     That is, the relative positional relationships of the electromagnetic motor  32  and the link levers  34  with respect to the main body member  5  can be determined at appropriate positions, so that smooth operations of the respective valve body portions  73  via the link disc  33  can be realized. As a result, the flow path switching device  1  according to the first embodiment can reduce a work load for ensuring smooth operations of the valve body portions  73 , and improve workability until the completion of the manufacturing. 
     Subsequently, configuration of the first heat medium check valve  60   a  and the like in the flow path switching device  1  will be described with reference to  FIGS.  8  and  9   . In the flow path switching device  1  according to the first embodiment, the first heat medium check valve  60   a  to the fifth heat medium check valve  60   e  are arranged in the first passage portion  10 , as described above. As illustrated in  FIG.  5   , the first heat medium check valve  60   a  to the fifth heat medium check valve  60   e  are each configured by using the first passage  11  and the reinforcing portion  12  formed in the first passage  11 . 
     In the following description, the first heat medium check valve  60   a  to the fifth heat medium check valve  60   e  may be collectively referred to as a heat medium check valve  60 , unless otherwise necessary. 
     First, the configuration of the reinforcing portion  12  will be described with reference to  FIGS.  7  and  8   . The reinforcing portion  12  is formed in a wall shape so as to cross the first passage  11  formed in a groove shape. As a result, the reinforcing portion  12  enhances stiffness against a load in the width direction of the first passage  11  having a groove shape. 
     In each of the reinforcing portions  12 , a passage hole  12   a  is formed. The passage hole  12   a  penetrates, in the thickness direction, the reinforcing portion  12  having a wall shape, and is configured such that the heat medium in the first passage  11  circulates therethrough. The inner diameter of the passage hole  12   a  is formed to be smaller than the outer diameter of a spherical valve body  62  to be described later. The passage hole  12   a  constitutes a valve seat on which the spherical valve body  62  is seated when the heat medium flows in from the outlet side of the heat medium check valve  60 . 
     As illustrated in  FIG.  9   , the reinforcing portion  12  has the joint surface  12   b.  The joint surface  12   b  of the reinforcing portion  12  is configured by connecting the surface on the side of the first passage portion  10  so as to cross the first passage  11 . When the sealing portions  21  of the first cover member  20  are attached to the surface of the first passage portion  10 , the joint surface  12   b  comes into contact with the surfaces of the respective sealing portions  21 , as illustrated in  FIG.  8   . 
     Here, according to the flow path switching device  1  of the first embodiment, the outer edge portions of the two sealing portions  21  of the first cover member  20  are joined to the joint surface  12   b  of the reinforcing portion  12  by laser welding or the like. As a result, in the flow path switching device  1 , the joint strength of the first cover member  20  with respect to the main body member  5  can be improved, and occurrence of leakage of the fluid from the first passage  11  can be reduced. 
     As illustrated in  FIGS.  8  and  9   , the joint surface  12   b  is formed by connecting the surface of the first passage portion  10 , so that when laser welding or the like is adopted, a change in setting of a focal length and the like can be minimized, and continuous joining work can be performed. 
     By forming the passage hole  12   a  in the reinforcing portion  12 , the reinforcing portion  12  changes the passage cross-sectional area of the first passage  11  so as to be reduced. Therefore, the reinforcing portion  12  has a role as a passage resistance portion that increases a passage resistance for the heat medium flowing through the first passage  11 . 
     As illustrated in  FIGS.  5 ,  8   , and the like, each of the heat medium check valves  60  includes a valve body housing portion  61  formed by using a part of the first passage  11 . The valve body housing portion  61  is arranged adjacent to the reinforcing portion  12  in the first passage  11 , and is responsible for the configuration, on the outlet side, of the heat medium check valve  60 . 
     The valve body housing portion  61  is a part of the first passage  11  adjacent to the reinforcing portion  12 , and houses the spherical valve body  62  therein. The spherical valve body  62  is configured to move inside the valve body housing portion  61  according to the flow of the heat medium in the first passage  11  including the valve body housing portion  61 . 
     The bottom surface of the valve body housing portion  61  is formed in a curved surface shape whose central portion in the width direction is recessed. As a result, it is possible to make a difference between the flow of the heat medium above the spherical valve body  62  and the flow of the heat medium below the spherical valve body  62 , which can suppress a backflow in the spherical valve body  62 . 
     As illustrated in  FIGS.  8  and  9   , a passage-side regulating piece  63  is arranged on the bottom surface of the valve body housing portion  61 . The passage-side regulating piece  63  is a protruding piece formed to protrude from the bottom surface of the valve body housing portion  61  along a direction in which the first passage  11  including the valve body housing portion  61  extends, which corresponds to an example of a regulating piece. The passage-side regulating piece  63  comes into contact with the spherical valve body  62  to regulate a moving range, inside the valve body housing portion  61 , of the spherical valve body  62 , which ensures the outflow of the heat medium from the outlet of the heat medium check valve  60 . 
     As illustrated in  FIG.  8   , a cover-side regulating piece  64  is formed in the sealing portion  21  of the first cover member  20  that seals the opened portion of the first passage  11  including the valve body housing portion  61 . The cover-side regulating piece  64  is a protruding piece protruding from the sealing portion  21  toward the inside of the valve body housing portion  61 , which corresponds to an example of the regulating piece. As a result, the passage-side regulating piece  63  and the cover-side regulating piece  64  cooperate with each other, so that the moving range of the spherical valve body  62  in the valve body housing portion  61  can be reliably regulated. 
     In the flow path switching device  1  according to the first embodiment, the first heat medium check valve  60   a  to the fifth heat medium check valve  60   e  are configured by using five reinforcing portions  12  and the like formed in the first passages  11 . The operations of the heat medium check valves  60  will be described with reference to  FIG.  8    by taking the second heat medium check valve  60   b  as a specific example. 
     In the example illustrated in  FIG.  8   , when the heat medium flows from the eleventh connection portion  90   k  to the fifth connection portion  90   e,  the spherical valve body  62  moves, according to the flow of the heat medium, toward the heat medium outlet side in the valve body housing portion  61  of the second heat medium check valve  60   b.    
     As a result, the passage hole  12   a  in the second heat medium check valve  60   b  is opened, and the flow of the heat medium from the side of the eleventh connection portion  90   k  toward the fifth connection portion  90   e  is allowed. At this time, the spherical valve body  62  comes, inside the valve body housing portion  61 , into contact with the passage-side regulating piece  63  and the cover-side regulating piece  64  to regulate the movement to the heat medium outlet side, so that the heat medium does not flow out from the valve body housing portion  61  to the outside. The spherical valve body  62  does not seal the heat medium outlet from the inside of the valve body housing portion  61 . 
     On the other hand, when the heat medium flows from the fifth connection portion  90   e  to the eleventh connection portion  90   k,  the spherical valve body  62  moves, according to the flow of the heat medium, toward the heat medium inlet side and is seated in the passage hole  12   a  inside the valve body housing portion  61  of the second heat medium check valve  60   b.  As a result, the passage hole  12   a  of the second heat medium check valve  60   b  is sealed by the spherical valve body  62 , and the flow of the heat medium from the fifth connection portion  90   e  to the eleventh connection portion  90   k  is prohibited. 
     In the flow path switching device  1  according to the first embodiment, each of the first heat medium check valve  60   a  to the fifth heat medium check valve  60   e  performs opening/closing operations according to the direction of the flow of the heat medium, as described above. As a result, the flow path switching device  1  can appropriately switch the passage configuration of the heat medium circuit  50 . 
     As illustrated in  FIG.  5   , the valve body housing portion  61  is arranged on one side (upper side in  FIG.  5   ) with respect to the reinforcing portion  12  in any of the first heat medium check valve  60   a  to the fifth heat medium check valve  60   e.  With such an arrangement, a mold can be removed in the same direction when the reinforcing portion  12  and the valve body housing portion  61  are formed, by the mold, in the first passage  11  in the first passage portion  10 . As a result, it is possible to improve work efficiency when the heat medium check valves  60  are formed in the first passage  11 . 
     Next, configurations of the first heat medium three-way valve  70   a  and the like in the flow path switching device  1  will be described with reference to the drawings. In the flow path switching device  1  according to the first embodiment, the first heat medium three-way valve  70   a,  the second heat medium three-way valve  70   b,  and the third heat medium three-way valve  70   c  are arranged as described above. 
     In the following description, the first heat medium three-way valve  70   a  to the third heat medium three-way valve  70   c  may be collectively referred to as a heat medium three-way valve  70 , unless otherwise necessary.  FIG.  10    is an explanatory view illustrating a basic configuration of the heat medium three-way valve  70 . 
     As illustrated in  FIG.  10   , the heat medium three-way valve  70  is a three-way flow control valve capable of adjusting a flow rate ratio between the flow rate of, of the heat medium flowing in from a heat medium inlet  72 , the heat medium flowing out of a first heat medium outlet  76  and the flow rate of the heat medium flowing out of a second heat medium outlet  77 . 
     In the first heat medium three-way valve  70   a,  the second passage  16  extending from the seventh connection port  35   g  corresponds to the heat medium inlet  72 . The first passage  11  extending to the first connection portion  90   a  and the first passage  11  extending to the eighth connection portion  90   h  correspond to the first heat medium outlet  76  and the second heat medium outlet  77 . 
     In the case of the second heat medium three-way valve  70   b,  the second passage  16  extending from the third connection port  35   c  corresponds to the heat medium inlet  72 . The first passage  11  extending to the second connection portion  90   b  and the first passage  11  extending to the fifth connection portion  90   e  correspond to the first heat medium outlet  76  and the second heat medium outlet  77 . 
     In the case of the third heat medium three-way valve  70   c,  the second passage  16  extending from the third communication portion  13   c  corresponds to the heat medium inlet  72 . The first passage  11  extending to the ninth connection port  35   i  and the first passage  11  extending to the tenth connection port  35   j  correspond to the first heat medium outlet  76  and the second heat medium outlet  77 . 
     As illustrated in  FIG.  10   , the heat medium three-way valve  70  is formed in a tubular shape extending in the stacking direction L. Therefore, in the first heat medium three-way valve  70   a  to the third heat medium three-way valve  70   c,  a communication passage that communicates the second passage  16  and the first passage  11  in the stacking direction L corresponds to a housing  71 . 
     The valve body portions  73  are arranged inside the housing  71 . The valve body portion  73  includes a drive disc  74  and a fixed disc  75 . The fixed disc  75  is arranged to divide the housing  71  in the stacking direction L, and has a first communication passage  75   a  and a second communication passage  75   b.    
     The first communication passage  75   a  penetrates the fixed disc  75  in the thickness direction thereof, and communicates a space on the side of the heat medium inlet  72  and a space on the side of the first heat medium outlet  76 . The second communication passage  75   b  penetrates the fixed disc  75  in the thickness direction thereof at a position adjacent to the first communication passage  75   a.  The second communication passage  75   b  communicates the space on the side of the heat medium inlet  72  and a space on the side of the second heat medium outlet  77 . 
     In the housing  71 , the space on the side of the first heat medium outlet  76  and the space on the side of the second heat medium outlet  77  are partitioned. Therefore, the heat medium does not flow in and out between the space on the side of the first heat medium outlet  76  and the space on the side of the second heat medium outlet  77  without passing through the first communication passage  75   a  and the second communication passage  75   b.    
     The drive disc  74  is arranged along the surface, on the side of the heat medium inlet  72 , of the fixed disc  75 , and is formed in a substantially fan-shaped plate shape. The drive disc  74  is formed in a size capable of sealing at least one of the first communication passage  75   a  and the second communication passage  75   b.  The drive disc  74  is fixed to the rotating shaft  74   a  constituting the valve body portion  73 . 
     Therefore, the drive disc  74  slides on the surface of the fixed disc  75  as the rotating shaft  74   a  rotates. As described above, the rotating shaft  74   a  reaches the inside of the drive unit  30  via a through hole of the second cover member  25 . As illustrated in  FIGS.  2  and  8   , the rotating shaft  74   a  in the drive unit  30  is connected to the link lever  34 . Therefore, the drive disc  74  slides on the surface of the fixed disc  75  as the electromagnetic motor  32  operates. 
     That is, the heat medium three-way valve  70  can change the position of the drive disc  74  with respect to the fixed disc  75  by controlling the operation of the drive unit  30 . As a result, the heat medium three-way valve  70  can adjust a flow rate ratio between the flow rate of the heat medium flowing out of the first heat medium outlet  76  and the flow rate of the heat medium flowing out of the second heat medium outlet  77 . The heat medium three-way valve  70  can allow the heat medium to flow out of either of the two outlets. 
     Therefore, according to the flow path switching device  1  of the first embodiment, the passage configuration of the heat medium circuit  50  can be appropriately switched by controlling the operations of the valve body portions  73  of the first heat medium three-way valve  70   a  to the third heat medium three-way valve  70   c.    
     As described above, the first heat medium on-off valve  80   a  and the second heat medium on-off valve  80   b  are arranged in the flow path switching device  1  according to the first embodiment. In the following description, a heat medium on-off valve  80  is used as a general term for the first heat medium on-off valve  80   a  and the second heat medium on-off valve  80   b.    
     The heat medium on-off valve  80  according to the first embodiment has the same basic configuration as the heat medium three-way valve  70  except that there is one heat medium outlet and one communication passage in the fixed disc  75 . Therefore, the heat medium on-off valve  80  has the valve body portion  73 . In the valve body portion  73  of the heat medium on-off valve  80 , one communication passage configured similarly to the first communication passage  75   a  is formed in the fixed disc  75 . By opening and closing the communication passage by the drive disc  74 , opening and closing operations of the heat medium on-off valve  80  are realized, and the presence or absence of the flow out of the heat medium from the heat medium outlet in the heat medium check valve  60  can be switched. 
     Therefore, according to the flow path switching device  1  of the first embodiment, the passage configuration of the heat medium circuit  50  can be appropriately switched by controlling the operations of the valve body portions  73  of the first heat medium on-off valve  80   a  and the second heat medium on-off valve  80   b.    
     As described above, according to the flow path switching device  1  of the first embodiment, the first passage portion  10 , the second passage portion  15 , and the drive unit  30  are stacked and arranged in this order, so that it is possible to switch the passage configuration of the heat medium circuit  50  by a compact configuration. 
     As illustrated in  FIG.  4   , the first cover member  20  of the flow path switching device  1  has the sealing portions  21  and the opening  23 , so that it is possible to easily locate a position where the fluid flowing through the first passage  11  leaks from between the sealing portion  21  of the first cover member  20  and the first passage portion  10 . Therefore, the flow path switching device  1  can improve work efficiency in detecting leakage of the fluid and rejoining the sealing portion  21  in a leak inspection, and can improve workability in manufacturing the flow path switching device  1 . 
     As illustrated in  FIGS.  4  and  5   , the sealing portions  21  of the first cover member  20  partially seal the opened portion of the first passage  11 , and are divided by the opening  23 . The first cover member  20  seals all of the opened portions of the first passages  11  having a groove shape by the sealing portions  21 . 
     Therefore, according to the flow path switching device  1 , it is possible, in a leak inspection for the first passage  11 , to detect the presence or absence of the leakage of the fluid from the first passage  11  for at least each portion of the first passage  11 , and it is possible to easily locate the position of the leakage. Furthermore, the sealing portion  21  where leakage has occurred can be rejoined independently of the work on the sealing portions  21  where no leakage has occurred, so that a work load in rejoining the first cover member  20  can be reduced to the minimum necessary. 
     As illustrated in  FIGS.  5  and  9   , the reinforcing portion  12  is formed inside the first passage  11 . The reinforcing portion  12  has the joint surface  12   b  that crosses, in the width direction, the first passage  11  formed in a groove shape and extends along the surface of the first passage portion  10 . As illustrated in  FIGS.  4  and  8   , the outer edges of at least two sealing portions  21  of the first cover member  20  are joined to the joint surface  12   b  of the reinforcing portion  12 . 
     As described above, the reinforcing portion  12  is formed to cross the first passage  11  in the width direction, so that the flow path switching device  1  can enhance the stiffness against a load in the width direction of the first passage  11  by the reinforcing portion  12 . Since the outer edges of at least two sealing portions  21  are joined to the joint surface  12   b,  the joint strength of the first cover member  20  to the surface of the first passage portion  10  can be improved. Since the joint surface  12   b  extends along the surface of the first passage portion  10  and a change in setting and the like can be reduced, it is possible to improve workability in the work of joining each of the sealing portions  21 . 
     As illustrated in  FIGS.  8  and  9   , the passage hole  12   a  is formed in the reinforcing portion  12 , and the valve body housing portion  61  for housing the spherical valve body  62  is formed at a position adjacent to the reinforcing portion  12 . In addition, the passage-side regulating piece  63  and the cover-side regulating piece  64  are arranged inside the valve body housing portion  61 . 
     As a result, the flow path switching device  1  can arrange the heat medium check valve  60  on the first passage  11  by using the first passage  11  and the reinforcing portion  12 . That is, the flow path switching device  1  can realize a compact configuration capable of switching the passage configuration by using the heat medium check valve  60 . 
     As illustrated in  FIG.  6   , the second cover member  25  of the flow path switching device  1  has the sealing portions  26  and the opening  27 , so that it is possible to easily locate a position where the fluid flowing through the second passage  16  leaks from between the sealing portion  26  of the second cover member  25  and the second passage portion  15 . Therefore, the flow path switching device  1  can improve work efficiency in detecting leakage of the fluid and rejoining the sealing portion  26  in a leak inspection, and can improve workability in manufacturing the flow path switching device  1 . 
     As illustrated in  FIGS.  2  and  8   , the drive unit  30  has the electromagnetic motor  32 , and the motor holder  17  is formed on the surface of the second passage portion  15 . As illustrated in  FIG.  6   , the motor holder  17  is formed at a position that corresponds to the opening  27  when the second cover member  25  is attached to the second passage portion  15 . 
     With such a configuration, the valve body portion  73  and the like and the drive shaft  32   a  of the electromagnetic motor  32  are arranged with the main body member  5  as a reference, and relative positional relationships among the respective members can be accurately determined. As a result, by enhancing the accuracy of the relative positional relationship between the electromagnetic motor  32  and the valve body portion  73 , it is possible to improve workability in such as work of attaching a configuration for transmitting the driving force of the electromagnetic motor  32  to the valve body portion  73 . 
     (Second Embodiment) 
     Next, a second embodiment different from the first embodiment will be described with reference to  FIGS.  11  and  12   . The second embodiment is different from the first embodiment in the configuration of the heat medium on-off valve  80  arranged in the flow path switching device  1 . The configurations, such as the basic configurations of the flow path switching device  1  and the heat medium circuit  50 , are the same as those of the first embodiment, so that repetitive description will be omitted. 
     In the first embodiment described above, the heat medium on-off valve  80  is configured to open and close the communication passage leading from the second passage  16  to the first passage  11 . In this regard, a heat medium on-off valve  80  of the second embodiment is configured to open and close a passage in either the first passage  11  or the second passage  16 . 
     As illustrated in  FIG.  11   , the heat medium on-off valve  80  according to the second embodiment is configured such that a valve body portion  82  is housed in a main body portion  81  formed in a cylindrical shape. The main body portion  81  is housed in the first passage  11  or the second passage  16 , and has a first inflow outlet  84   a  and a second inflow outlet  84   b.    
     The valve body portion  82  is formed in a cylindrical shape, and an internal passage  83  is formed therein. The internal passage  83  is formed to be capable of communicating the first inflow outlet  84   a  and the second inflow outlet  84   b  in the main body portion  81 . According to the flow path switching device  1 , the positions of the internal passage  83  of the valve body portion  82  with respect to the first inflow outlet  84   a  and the second inflow outlet  84   b  in the main body portion  81  can be adjusted by controlling the operation of the drive unit  30 . 
     That is, the heat medium on-off valve  80  constitutes a so-called rotary valve that rotates the valve body portion  82  having a cylindrical shape. As a result, the heat medium on-off valve  80  can switch the presence or absence of the flow of the heat medium from either the first inflow outlet  84   a  or the second inflow outlet  84   b  to the other. 
     As illustrated in  FIG.  12   , when the heat medium on-off valve  80  of the second embodiment is arranged to be connected to the communication portion  13  communicating the first passage  11  and the second passage  16 , the same effects as those of the heat medium on-off valve  80  of the first embodiment can be exhibited. 
     For example, when the heat medium on-off valves  80  on the side of the first passage  11  and on the side of the second passage  16  in  FIG.  12    are opened, the flow of the heat medium between the first passage  11  and the second passage  16  via the communication portion  13  is allowed. 
     When either of the heat medium on-off valves  80  on the side of the first passage  11  and on the side of the second passage  16  is closed, the flow of the heat medium between the first passage  11  and the second passage  16  via the communication portion  13  is prohibited. 
     The configuration of the heat medium on-off valve  80  according to the second embodiment can also be adopted in the heat medium three-way valve  70 . The heat medium three-way valve  70  in this case is configured to be capable of switching the outflow destination of the fluid in either the first passage  11  or the second passage  16 . Specifically, three inflow outlets are formed in the main body portion of the heat medium three-way valve  70  in this case, and the internal passage of the valve body portion is formed to be capable of communicating at least two of the three inflow outlets. 
     As described above, when the three-way valve of a rotary valve type is adopted, the flow path switching device  1  can switch the outflow destination of the fluid in either the first passage  11  or the second passage  16 . 
     As described above, according to the flow path switching device  1  of the second embodiment, it is possible to obtain the operational effects exerted from the configuration and operation common to the first embodiment described above, similarly to the first embodiment, even when the configuration of the heat medium on-off valve  80  is changed. 
     (Third Embodiment) 
     Subsequently, a third embodiment different from the embodiments described above will be described with reference to  FIGS.  13  and  14   . In a flow path switching device  1  according to the third embodiment, a heat medium switch valve  85  is arranged instead of the heat medium three-way valve  70  in the embodiments described above. The configurations, such as the basic configurations of the flow path switching device  1  and the heat medium circuit  50 , are the same as those of the embodiments described above, so that repetitive description will be omitted. 
     As illustrated in  FIG.  13   , the heat medium switch valve  85  according to the third embodiment has a three-way valve structure for switching the flow of the heat medium in the first passage  11  and a three-way valve structure for switching the flow of the heat medium in the second passage  16 . The heat medium switch valve  85  can simultaneously perform a switching operation in the first passage  11  and a switching operation in the second passage  16 . 
     Specifically, a configuration of the heat medium switch valve  85  according to the third embodiment will be described. As illustrated in  FIG.  13   , the heat medium switch valve  85  is configured such that the valve body portion  82  is housed in a main body portion  81  formed in a cylindrical shape. The main body portion  81  is formed in a cylindrical shape extending in the stacking direction L, and at least a part thereof is housed in the first passage  11  and the other part thereof is housed in the second passage  16 . 
     A first inflow outlet  84   a,  a second inflow outlet  84   b,  and a third inflow outlet  84   c  are formed in a portion of the main body portion  81  that is arranged in the second passage  16 . The first inflow outlet  84   a  to the third inflow outlet  84   c  are respectively connected to the different portions of the second passage  16 . 
     In addition, a fourth inflow outlet  84   d,  a fifth inflow outlet  84 e, and a sixth inflow outlet  84   f  are formed in a portion of the main body portion  81  that is arranged in the first passage  11 . The fourth inflow outlet  84   d  to the sixth inflow outlet  84   f  are respectively connected to the different portions of the first passage  11 . 
     The valve body portion  82  in the third embodiment is formed in a cylindrical shape, and a first internal passage  83   a  and a second internal passage  83   b  are formed therein. The first internal passage  83   a  and the second internal passage  83   b  are formed to be aligned in the stacking direction L in the valve body portion  82 . 
     The first internal passage  83   a  has a configuration in which three linear passages are connected at one place, and is formed to be capable of communicating at least two of the fourth inflow outlet  84   d  to the sixth inflow outlet  84   f.  Similarly, the second internal passage  83   b  has a configuration in which three linear passages are connected at one place, and is configured to be capable of communicating at least two of the first inflow outlet  84   a  to the third inflow outlet  84   c.    
     The flow path switching device  1  rotates the valve body portion  82  inside the main body portion  81  by controlling the operation of the drive unit  30 . As described above, the valve body portion  82  has the first internal passage  83   a  and the second internal passage  83   b.  Therefore, the positions of the first internal passage  83   a  with respect to the fourth inflow outlet  84   d  to the sixth inflow outlet  84   f  and the positions of the second internal passage  83   b  with respect to the first inflow outlet  84   a  to the third inflow outlet  84   c  can be simultaneously adjusted, as illustrated in  FIG.  14   . 
     That is, in the flow path switching device  1  according to the third embodiment, the passage configuration, for the heat medium, of the first passage  11  and the passage configuration, for the heat medium, of the second passage  16  can be simultaneously switched by rotating the valve body portion  82  of the heat medium switch valve  85 . 
     As described above, according to the flow path switching device  1  of the third embodiment, it is possible to obtain the operational effects exerted from the configuration and operation common to the embodiments described above, similarly to the embodiments described above, even when the heat medium switch valve  85  is adopted. 
     (Fourth Embodiment) 
     Next, a fourth embodiment different from the embodiments described above will be described with reference to  FIGS.  15  and  16   . In a flow path switching device  1  according to the fourth embodiment, the configurations of a first cover member  20  and a second cover member  25  are different from those of the embodiments described above. Therefore, the configurations, such as the basic configurations of the flow path switching device  1  and the heat medium circuit  50 , are similar to those of the embodiments described above, so that repetitive description will be omitted. 
     As illustrated in  FIG.  15   , the first cover member  20  of the fourth embodiment has a frame-shaped portion  24  in addition to the sealing portions  21  and the opening  23 . The frame-shaped portion  24  is a frame-shaped member arranged along the outer edge of the surface of the first passage portion  10 , and connects among the sealing portions  21 . 
     Even with such a configuration, the sealing portions  21  and the opening  23  are formed in the first cover member  20 , so that it is possible, in a leak inspection in manufacturing the flow path switching device  1 , to easily locate the position of leakage of the heat medium that has occurred in the first passage  11 . 
     As illustrated in  FIG.  16   , the second cover member  25  of the fourth embodiment has a frame-shaped portion  28  in addition to the sealing portions  26  and the opening  27 . The frame-shaped portion  28  is a frame-shaped member arranged along the outer edge of the surface of the second passage portion  15 , and connects among the sealing portions  26 . 
     Even with such a configuration, the sealing portions  26  and the opening  27  are formed in the second cover member  25 , so that it is possible, in a leak inspection in manufacturing the flow path switching device  1 , to easily locate the position of leakage of the heat medium that has occurred in the second passage  16 . 
     As described above, according to the flow path switching device  1  of the fourth embodiment, it is possible to obtain the operational effects exerted from the configuration and operation common to the embodiments described above, similarly to the embodiments described above, even when the frame-shaped portions are provided in the first cover member  20  and the second cover member  25 . 
     Although the embodiments have been described above, the present disclosure is not limited to the embodiments described above at all. That is, various improvements and changes can be made without departing from the gist of the present disclosure. 
     In the embodiments described above, the second sealing portion  21   b  of the first cover member  20  seals, as one member, the opened portions between the valve body housing portion  61  of the third heat medium check valve  60   c  and the second communication portion  13   b  and between the valve body housing portion  61  of the fifth heat medium check valve  60   e  and the first communication portion  13   a.  However, the configuration of the second sealing portion  21   b  is not limited to this aspect. 
     That is, the second sealing portion  21   b  may be divided at the positions of the reinforcing portions  12  related to the third heat medium check valve  60   c  and the fifth heat medium check valve  60   e,  and the outer edge of the sealing portions  21  may be joined at the joint surface  12   b  between the respective reinforcing portions  12 . 
     Specifically, for example, regarding the opened portion of the third heat medium check valve  60   c,  the opened portion related to the valve body housing portion  61  of the third heat medium check valve  60   c  is sealed by the second sealing portion  21   b.  Then, the opened portion, related from the reinforcing portion  12  of the third heat medium check valve  60   c  to the second communication portion  13   b,  is configured to be sealed by the sealing portion  21  as a separate member. With such a configuration, the outer edge of the sealing portions  21  can be joined to improve the joint strength, even at the joint surface  12   b  in the reinforcing portion  12  of the third heat medium check valve  60   c.  Description of a specific example of the fifth heat medium check valve  60   e  will be omitted. 
     In the drive unit  30  of the embodiments described above, the driving force of the electromagnetic motor  32  is transmitted to the valve body portions  73  and the like via the link disc  33  and the link levers  34 , but the present disclosure is not limited to this aspect. Various aspects can be adopted as long as the driving force of the electromagnetic motor  32  can be transmitted to the valve body portions  73 . For example, as a configuration of the drive unit  30 , the driving force of the electromagnetic motor  32  may be transmitted to the valve body portions  73  via a gear train or a belt mechanism. 
     In the embodiments described above, the link disc  33  is attached to the drive shaft  32   a  of the electromagnetic motor  32 , so that the position of the drive shaft  32   a  matches the rotation center of the link disc  33 , but the present disclosure is not limited to this aspect. For example, as long as the driving force generated in the drive shaft  32   a  can be transmitted to the link disc  33  by a transmission mechanism adopting a gear train, a belt, or the like, the rotation center of the link disc  33  may be shifted from the position of the drive shaft  32   a  of the electromagnetic motor  32 . 
     In the embodiments described above, the bottom surface of the valve body housing portion  61  is formed in a curved surface shape to suppress a backflow in the spherical valve body  62 , as illustrated in  FIG.  9   , but the present disclosure is not limited to this aspect. Various aspects can be adopted as long as a difference can be made between the flow of the heat medium circulating through the bottom surface side of the valve body housing portion  61  with respect to the spherical valve body  62  and the flow of the heat medium circulating through the side of the sealing portion  21  with respect to the spherical valve body  62 . For example, a recess recessed in the thickness direction of the sealing portion  21  may be formed in, of the surface of the sealing portion  21 , a portion on the inner side of the valve body housing portion  61 . 
     In addition, in the embodiments described above, an example has been described in which the flow path switching device  1  according to the present disclosure is applied to the heat medium circuit  50  in a vehicle air conditioner with an in-vehicle equipment cooling function, but the present disclosure is not limited thereto. 
     The flow path switching device  1  according to the present disclosure may be applied to a heat medium circuit of a stationary air conditioner or the like, without being limited to a heat medium circuit for a vehicle. For example, the flow path switching device may be applied to a heat medium circuit of an air conditioner or the like with a server cooling function in which the temperature of a server (computer) is appropriately adjusted and simultaneously a room where the server is housed is air-conditioned. 
     The embodiments have been described, in which an ethylene glycol aqueous solution is adopted as the heat medium in the heat medium circuit  50 , but the heat medium is not limited thereto. For example, a solution containing dimethylpolysiloxane, a nanofluid, or the like, an antifreeze liquid, or the like can be adopted as the heat medium. 
     Although the present disclosure has been described in accordance with the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure also encompasses various modifications and variations within the scope of equivalents. In addition, various combinations and modes, and other combinations and modes including only one element, more elements, or less elements are also within the scope and idea of the present disclosure.