Patent Publication Number: US-2022232731-A1

Title: Tank and cooling unit

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority under 35 U.S.C. § 119 to Japanese Patent Application No. 2021-006712, filed on Jan. 19, 2021, the entire contents of which are hereby incorporated herein by reference. 
     1. FIELD OF THE INVENTION 
     The present disclosure relates to a tank and a cooler. 
     2. BACKGROUND 
     A liquid feeder that feeds liquid using a pump is used in various apparatuses. In one example, a liquid feeder is used in a cooling apparatus that circulates a refrigerant for cooling a heat generating component. In order to prevent the pump from idling, a tank that prevents a refrigerant containing gas from flowing into the pump has been studied. 
     Conventionally, there has been known a refrigerant storage tank in which a restraining plate facing an outflow port in a tank main body is disposed near the outflow port. In the conventional refrigerant storage tank, the restraining plate can prevent the refrigerant from flowing directly from the inflow port to the outflow port, so that the gas in the refrigerant can be prevented from flowing into the pump. 
     However, even in the conventional refrigerant storage tank, the gas in the tank main body may enter the outflow port, and the gas may flow into the pump. For example, when the orientation or attitude of the refrigerant storage tank is changed and the outflow port of the tank main body is positioned vertically above, the refrigerant in the tank main body gathers vertically below the tank main body, and as a result, the gas in the tank main body gathers near the outflow port of the tank main body positioned vertically above. In this case, the gas in the vicinity of the outflow port may flow out from the outflow port. 
     SUMMARY 
     An example embodiment of a tank of the present disclosure includes a housing including a tank chamber, a tank chamber inflow hole through which liquid flows into the tank chamber, a tank chamber outflow hole through which the liquid flows out from the tank chamber, and a protruding flow path connected to the tank chamber outflow hole and protruding from the tank chamber outflow hole into the tank chamber. 
     An example embodiment of a cooler of the present disclosure includes the tank described above, and a cover on the tank chamber outflow hole side of the tank. At least the tank and the cover define a second flow path, and liquid flowing out from the tank chamber outflow hole of the tank flows in the second flow path along a direction different from a direction in which the protruding flow path extends. 
     The above and other elements, features, steps, characteristics and advantages of the present disclosure will become more apparent from the following detailed description of the example embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic perspective view of a tank of a first example embodiment of the present disclosure. 
         FIG. 2A  is a schematic cross-sectional perspective view of the tank of the first example embodiment. 
         FIG. 2B  is a schematic cross-sectional view of the tank of the first example embodiment. 
         FIG. 3A  is a schematic cross-sectional perspective view of a tank of a second example embodiment of the present disclosure. 
         FIG. 3B  is a schematic cross-sectional view of the tank of the second example embodiment. 
         FIG. 4A  is a schematic cross-sectional perspective view of a tank of a third example embodiment of the present disclosure. 
         FIG. 4B  is a schematic cross-sectional view of the tank of the third example embodiment. 
         FIG. 5A  is a schematic cross-sectional perspective view of a tank of a fourth example embodiment of the present disclosure. 
         FIG. 5B  is a schematic cross-sectional view of the tank of the fourth example embodiment. 
         FIG. 6A  is a schematic cross-sectional perspective view of a tank of a fifth example embodiment of the present disclosure. 
         FIG. 6B  is a schematic cross-sectional perspective view of a tank of a sixth example embodiment of the present disclosure. 
         FIG. 7  is a schematic perspective view of a cooler of a seventh example embodiment of the present disclosure. 
         FIG. 8  is a schematic exploded perspective view of the cooler of the seventh example embodiment. 
         FIG. 9  is a schematic cross-sectional view of the cooler of the seventh example embodiment. 
         FIG. 10  is a schematic cross-sectional view of the cooler of the seventh example embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, example embodiments of the present disclosure will be described with reference to the accompanying drawings. Note that in the drawings, the same or corresponding parts will be denoted by the same reference symbols and description thereof will not be repeated. The present specification may refer to an X-axis, a Y-axis, and a Z-axis, orthogonal to each other, to facilitate the understanding of the disclosure. Typically, any one of the X-axis, the Y-axis, and the Z-axis is parallel to the vertical direction, and the remaining two are parallel to the horizontal direction. Further, a direction on one side in the X axis is defined as a +X direction, and a direction on the other side is defined as a −X direction. Further, a direction on one side in the Y axis is defined as a +Y direction, and a direction on the other side is defined as a −Y direction. Further, a direction on one side in the Z axis is defined as a +Z direction, and a direction on the other side is defined as a −Z direction. However, the orientations of the X axis, the Y axis, and the Z axis are not intended to limit the orientation when the cooler according to the present disclosure is used. 
     Next, a tank  100  of a first example embodiment will be described with reference to  FIG. 1 .  FIG. 1  is a schematic perspective view of the tank  100 . 
     The tank  100  can store liquid. The liquid stored in the tank  100  may be water. Alternatively, the liquid may be a mixed liquid. For example, the mixed liquid may contain water and propylene glycol. 
     Liquid flows into the tank  100 . The liquid in the tank  100  flows out of the tank  100 . The tank  100  is used for circulation of liquid. The tank  100  can temporarily store liquid circulating through the tank  100 . 
     As illustrated in  FIG. 1 , the tank  100  includes a housing  110 , a tank chamber inflow hole  120 , and a tank chamber outflow hole  130 . The housing  110  has a tank chamber  114  which is a hollow part. The tank chamber  114  constitutes an internal space of the housing  110 . The tank chamber  114  stores the liquid flowing into the tank  100 . 
     Here, the outer shape of the housing  110  is a substantially rectangular parallelepiped shape. The housing  110  extends in the X direction, and the longitudinal direction of the housing  110  is the X direction. The housing  110  has an outer peripheral surface  111  and an inner peripheral surface  112 . 
     The outer peripheral surface  111  of the housing  110  has a first outer main surface  111   a , a second outer main surface  111   b , a first outer side surface  111   c , a second outer side surface  111   d , a third outer side surface  111   e , and a fourth outer side surface  111   f . The first outer side surface  111   c  and the second outer side surface  111   d  each are connected to the first outer main surface  111   a  and the second outer main surface  111   b . The third outer side surface  111   e  and the fourth outer side surface  111   f  each are connected to the first outer main surface  111   a , the second outer main surface  111   b , the first outer side surface  111   c , and the second outer side surface  111   d . The first outer main surface  111   a  is located on the +Z direction side, and the second outer main surface  111   b  is located on the −Z direction side. The first outer side surface  111   c  is located on the −X direction side, and the second outer side surface  111   d  is located on the +X direction side. The third outer side surface  111   e  is located on the +Y direction side, and the fourth outer side surface  111   f  is located on the −Y direction side. Here, the first outer main surface  111   a , the second outer main surface  111   b , the first outer side surface  111   c , the second outer side surface  111   d , the third outer side surface  111   e , and the fourth outer side surface  111   f  are all flat surfaces. 
     The inner peripheral surface  112  of the housing  110  has a first inner main surface  112   a , a second inner main surface  112   b , a first inner side surface  112   c , a second inner side surface  112   d , a third inner side surface  112   e , and a fourth inner side surface  112   f . The first inner side surface  112   c  and the second inner side surface  112   d  each are connected to the first inner main surface  112   a  and the second inner main surface  112   b . The third inner side surface  112   e  and the fourth inner side surface  112   f  each are connected to the first inner main surface  112   a , the second inner main surface  112   b , the first inner side surface  112   c , and the second inner side surface  112   d . The first inner main surface  112   a  is located on the +Z direction side, and the second inner main surface  112   b  is located on the −Z direction side. The first inner side surface  112   c  is located on the −X direction side, and the second inner side surface  112   d  is located on the +X direction side. The third inner side surface  112   e  is located on the +Y direction side, and the fourth inner side surface  112   f  is located on the −Y direction side. Here, the first inner main surface  112   a , the second inner main surface  112   b , the first inner side surface  112   c , the second inner side surface  112   d , the third inner side surface  112   e , and the fourth inner side surface  112   f  are all flat surfaces. 
     Here, the tank chamber inflow hole  120  is located on the +Z direction side with respect to the tank chamber  114 . The tank chamber inflow hole  120  is a through hole connecting the first outer main surface  111   a  and the first inner main surface  112   a . The tank chamber outflow hole  130  is located on the −Z direction side with respect to the tank chamber  114 . The tank chamber outflow hole  130  is a through hole connecting the second inner main surface  112   b  and the second outer main surface  111   b.    
     Liquid flows into the tank chamber  114  through the tank chamber inflow hole  120 . The liquid in the tank chamber  114  flows out through the tank chamber outflow hole  130 . 
     Here, the tank chamber  114  is a substantially rectangular parallelepiped shape. The tank chamber  114  extends in the X direction, and the longitudinal direction of the tank chamber  114  is the X direction. The tank chamber  114  is surrounded by the first inner main surface  112   a , the second inner main surface  112   b , the first inner side surface  112   c , the second inner side surface  112   d , the third inner side surface  112   e , and the fourth inner side surface  112   f.    
     An inflow attachment port  122  connected to the tank chamber inflow hole  120  is disposed outside the housing  110 . The inflow attachment port  122  is located on the +Z direction side with respect to the first outer main surface  111   a  of the housing  110 . The inflow attachment port  122  has a cylindrical shape. The inflow attachment port  122  is disposed to surround the tank chamber inflow hole  120 . Here, the inner diameter (length in the XY plane) of the inflow attachment port  122  is larger than the hole diameter (length in the XY plane) of the tank chamber inflow hole  120 . However, the inner diameter of the inflow attachment port  122  may be substantially equal to the hole diameter of the tank chamber inflow hole  120 . A pipe (not shown) through which liquid flows is attached to the inflow attachment port  122 . 
     Further, an outflow attachment port  132  connected to the tank chamber outflow hole  130  is disposed outside the housing  110 . The outflow attachment port  132  is located on the −Z direction side with respect to the second outer main surface  111   b  of the housing  110 . The outflow attachment port  132  has a cylindrical shape. The outflow attachment port  132  is disposed to surround the tank chamber outflow hole  130 . The tank chamber outflow hole  130  is located at the center of the second inner main surface  112   b . The inner diameter (length in the XY plane) of the outflow attachment port  132  is larger than the hole diameter (length in the XY plane) of the tank chamber outflow hole  130 . However, the inner diameter of the outflow attachment port  132  may be substantially equal to the hole diameter of the tank chamber outflow hole  130 . A pipe (not illustrated) through which liquid flows is attached to the outflow attachment port  132 . 
     Typically, the hole diameter (length in the XY plane) of the tank chamber outflow hole  130  is substantially equal to the hole diameter (length in the XY plane) of the tank chamber inflow hole  120 . The inner diameter (length in the XY plane) of the outflow attachment port  132  is substantially equal to the inner diameter (length in the XY plane) of the inflow attachment port  122 . 
     Here, the tank  100  has a symmetrical structure with respect to the XZ plane located at the center portion along the Y direction except for the tank chamber inflow hole  120  and the inflow attachment port  122 . However, the tank  100  may not have a symmetrical structure. 
     Next, the tank  100  of the first example embodiment will be described with reference to  FIGS. 1 to 2B .  FIG. 2A  is a schematic cross-sectional perspective view of the tank  100  of the first example embodiment, and  FIG. 2B  is a schematic cross-sectional view of the tank  100  of the first example embodiment. 
     As illustrated in  FIGS. 2A and 2B , the tank  100  further includes a protruding flow path  140  in addition to the housing  110 , the tank chamber inflow hole  120 , and the tank chamber outflow hole  130 . In the tank  100  of the first example embodiment, the protruding flow path  140  has a cylindrical shape. The protruding flow path  140  has a through hole extending in the Z direction. The outer peripheral surface and the inner peripheral surface of the protruding flow path  140  each have a cylindrical shape. However, the protruding flow path  140  may have a tubular shape, and the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may each have a rectangular parallelepiped shape. The combination of the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may be arbitrary.  FIGS. 2A and 2B  each show a cross section along the center of the protruding flow path  140  having a cylindrical shape. The housing  110  has the tank chamber  114 . Liquid flows into the tank chamber  114  from the tank chamber inflow hole  120 . Liquid in the tank chamber  114  flows out through the tank chamber outflow hole  130 . 
     The protruding flow path  140  is connected to the tank chamber outflow hole  130 . The protruding flow path  140  protrudes from the tank chamber outflow hole  130  into the tank chamber  114 . Specifically, the protruding flow path  140  protrudes in the +Z direction from the second inner main surface  112   b  toward the inside of the tank chamber  114 . 
     The protruding flow path  140  has a first end  140   a  and a second end  140   b . The first end  140   a  is located on the tank chamber outflow hole  130  side. The second end  140   b  is located on the side opposite to the tank chamber outflow hole  130 . 
     The protruding flow path  140  has a flow path inlet  140 P, a flow path outlet  140 Q, and a first flow path  140 R. The flow path inlet  140 P is located on the +Z direction side with respect to the second end  140   b  of the protruding flow path  140 . The liquid in the flow path inlet  140 P passes through the first flow path  140 R and flows to the flow path outlet  140 Q. The flow path outlet  140 Q is located on the −Z direction side with respect to the first end  140   a  of the protruding flow path  140 . The tank chamber outflow hole  130  is located in the flow path outlet  140 Q. Here, the outflow attachment port  132  is disposed at the flow path outlet  140 Q. The first flow path  140 R connects the flow path inlet  140 P and the flow path outlet  140 Q. 
     The outflow attachment port  132  has a cylindrical shape. The outflow attachment port  132  faces the protruding flow path  140  via the tank chamber outflow hole  130 . Typically, the inner diameter (length in the XY plane) of the protruding flow path  140  is substantially equal to the inner diameter (length in the XY plane) of the outflow attachment port  132 . However, the inner diameter of the protruding flow path  140  may be different from the inner diameter of the outflow attachment port  132 . 
     The tank chamber outflow hole  130  is a through hole connecting the second inner main surface  112   b  and the second outer main surface  111   b . The tank chamber outflow hole  130  is surrounded by a protruding flow path  140  protruding in the +Z direction from the second inner main surface  112   b . Therefore, in the tank  100  shown in  FIGS. 2A and 2B , even if the orientation or attitude of the tank  100  is changed such that the second outer main surface  111   b  of the tank  100  faces vertically upward in a state where the gas is accumulated together with the liquid in the tank chamber  114 , the gas in the tank chamber  114  cannot reach the flow path inlet  140 P and hardly directly enters the protruding flow path  140 . Therefore, according to the tank  100  of the present example embodiment, the protruding flow path  140  can suppress gas from entering the tank chamber outflow hole  130  regardless of the attitude of the tank  100 . 
     The housing  110  includes a first component  110 S and a second component  110 T. The second component  110 T constitutes the tank chamber  114  together with the first component  110 S. The first component  110 S has the tank chamber inflow hole  120  and the inflow attachment port  122 . The first component  110 S has the first outer main surface  111   a , the first outer side surface  111   c , the second outer side surface  111   d , the third outer side surface  111   e , the fourth outer side surface  111   f , the first inner main surface  112   a , the first inner side surface  112   c , the second inner side surface  112   d , the third inner side surface  112   e , and the fourth inner side surface  112   f.    
     The second component  110 T has the tank chamber outflow hole  130 , the outflow attachment port  132 , and the protruding flow path  140 . The second component  110 T has the second outer main surface  111   b  and the second inner main surface  112   b . By constituting the tank  100  with the first component  110 S and the second component  110 T, the tank  100  can be configured of a small number of components, and the cost can be reduced. 
     If the height Ha (length along the Z direction) of the protruding flow path  140  is too short with respect to the height Hr (length along the Z direction) of the tank chamber  114 , even if the amount of liquid in the tank chamber  114  is relatively large, the gas in the tank chamber  114  may enter the tank chamber outflow hole  130  when the orientation or attitude of the tank  100  is changed so that the second outer main surface  111   b  faces vertically upward. In addition, if the height Ha of the protruding flow path  140  is too long with respect to the height Hr in the tank chamber  114 , even if the amount of liquid in the tank chamber  114  is relatively large, the gas in the tank chamber  114  may enter the tank chamber outflow hole  130  when the orientation or attitude of the tank  100  is changed such that the first outer main surface  111   a  faces vertically upward. Therefore, for example, the height Ha of the protruding flow path  140  may be 30% or more and 70% or less of the height Hr in the tank chamber  114 . When the height Ha of the protruding flow path  140  is about 50% of the height Hr of the inside of the tank chamber  114 , the air hardly enters regardless of the attitude in the vertical direction. 
     When the height (length along the Z direction) of the protruding flow path  140  is 50% of the height (length along the Z direction) in the tank chamber  114 , the second end  140   b  of the protruding flow path  140  is located at the center between the surface (that is, the first inner main surface  112   a ) of the first component  110 S on the tank chamber  114  side and the surface (that is, the second inner main surface  112   b ) of the second component  110 T on the tank chamber  114  side. Since the second end  140   b  is located at the center of the height of the tank chamber  114 , the volume in which the gas can be stored vertically above the flow path inlet  140 P increases, and the gas can be suppressed from entering the tank chamber outflow hole  130 . In addition, since the length of the protruding flow path  140  is relatively long with respect to the tank chamber  114 , it is possible to suppress gas from entering the protruding flow path  140 . 
     In the description with reference to  FIGS. 1 to 2B , the housing  110  has the tank chamber  114  having a substantially rectangular parallelepiped shape, but the present example embodiment is not limited thereto. It is preferable that the housing  110  is configured to further suppress the outflow of the gas from the tank  100 . Since the liquid flows from the flow path inlet  140 P to the protruding flow path  140 , the housing  110  regulates the flow around the flow path inlet  140 P, so that it is possible to suppress the gas from flowing out of the tank  100 . 
     Next, a tank  100  of a second example embodiment will be described with reference to  FIGS. 3A and 3B .  FIG. 3A  is a schematic cross-sectional perspective view of the tank  100  of the second example embodiment, and  FIG. 3B  is a schematic cross-sectional view of the tank  100  of the second example embodiment. The tank  100  of the second example embodiment shown in  FIGS. 3A and 3B  has a configuration similar to that of the tank  100  of the first example embodiment shown in  FIGS. 2A and 2B  except that the housing  110  has a protruding wall  112   w  protruding toward the protruding flow path  140 , and redundant description is omitted for the purpose of avoiding redundancy. Even in this example, the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  each have a cylindrical shape. However, the protruding flow path  140  may have a tubular shape, and the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may each have a rectangular parallelepiped shape. The combination of the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may be arbitrary. 
     As shown in  FIGS. 3A and 3B , in the tank  100 , the housing  110  has the protruding wall  112   w  protruding toward the protruding flow path  140 . The protruding wall  112   w  partially protrudes in the −Z direction from the first inner main surface  112   a . The protruding wall  112   w  faces the +Z direction side with respect to the protruding flow path  140 . The protruding wall  112   w  restricts the flow of liquid flowing in from the +Z direction side with respect to the flow path inlet  140 P. Therefore, it is possible to suppress gas from entering the protruding flow path  140  by the protruding wall  112   w  in the housing  110 . 
     The length (Lw) of the protruding wall  112   w  along the X direction is substantially equal to the length (La) of the protruding flow path  140  along the X direction. The length (Ww) of the protruding wall  112   w  along the Y direction is substantially equal to the length (Wa) of the outer diameter of the protruding flow path  140  along the Y direction. 
     It is preferable that the length (Hw) of the protruding wall  112   w  along the Z direction and the length (Ha) of the protruding flow path  140  along the Z direction are designed such that the flow path inlet  140 P is positioned at the center of the height Hr of the tank chamber  114 . For example, the length (Hw) of the protruding wall  112   w  along the Z direction may be substantially equal to the length (Ha) of the protruding flow path  140  along the Z direction. 
     The protruding flow path  140  includes the flow path inlet  140 P into which liquid flows, the flow path outlet  140 Q from which liquid flows out, and the first flow path  140 R connecting the flow path inlet  140 P and the flow path outlet  140 Q. Here, the flow path inlet  140 P is defined by the second end  140   b  of the protruding flow path  140  and a surface of the protruding wall  112   w  facing the protruding flow path  140 . The flow path inlet  140 P is closed in the straight advancing direction (Z direction) of the protruding flow path  140 , and is open in a direction (X direction or Y direction) different from the direction (Z direction) in which the first flow path  140 R extends. Therefore, it is possible to suppress the liquid from flowing into the protruding flow path  140  along the extending direction of the protruding flow path  140 , and as a result, it is possible to suppress generation of bubbles due to generation of a spiral and a wave in the flow path inlet  140 P and to suppress entry of the gas accumulated in the tank into the protruding flow path. 
     In the description with reference to  FIGS. 1 to 3B , the protruding wall  112   w  extends from the first inner main surface  112   a  toward the protruding flow path  140 , but the present example embodiment is not limited thereto. The protruding wall  112   w  may extend toward the protruding flow path  140  so as to partially suppress the inflow of liquid into the flow path inlet  140 P. 
     Next, a tank  100  of a third example embodiment will be described with reference to  FIGS. 4A and 4B .  FIG. 4A  is a schematic cross-sectional perspective view of the tank  100  of the third example embodiment, and  FIG. 4B  is a schematic cross-sectional view of the tank  100  of the third example embodiment. The tank  100  of the third example embodiment shown in  FIGS. 4A and 4B  has a configuration similar to that of the tank  100  of the second example embodiment shown in  FIGS. 3A and 3B  except that a part of the protruding wall  112   w  partially protrudes, and redundant description is omitted in order to avoid redundancy. Even in this example, the outer peripheral surface of the protruding flow path  140  has a rectangular parallelepiped shape, and the inner peripheral surface of the protruding flow path  140  has a cylindrical shape. However, the combination of the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may be arbitrary. 
     As shown in  FIGS. 4A and 4B , in the tank  100  of the third example embodiment, the housing  110  has the protruding wall  112   w . The protruding wall  112   w  has a main body  112   wa  and a protrusion  112   wb . The main body  112   wa  partially protrudes in the −Z direction from the first inner main surface  112   a . The main body  112   wa  faces the +Z direction side with respect to the protruding flow path  140 . The main body  112   wa  restricts the flow of liquid flowing in from the +Z direction side with respect to the flow path inlet  140 P. 
     The protrusion  112   wb  partially protrudes from the surface of the main body  112   wa  on the protruding flow path  140  side toward the protruding flow path  140 . The protrusion  112   wb  partially protrudes in the −Z direction from an end on the +Y direction side of a surface of the main body  112   wa  facing the protruding flow path  140 . Further, the protrusion  112   wb  partially protrudes in the −Z direction from an end on the −Y direction side of a surface of the main body  112   wa  facing the protruding flow path  140 .  FIGS. 4A and 4B  illustrate the protrusion  112   wb  extending from an end on the +Y direction-side of the surface of the main body  112   wa  facing the protruding flow path  140  toward the flow path inlet  140 P of the protruding flow path  140 . However, the protrusion  112   wb  also extends from an end on the −Y direction-side of the surface of the main body  112   wa  facing the protruding flow path  140  toward the flow path inlet  140 P of the protruding flow path  140 . The protrusion  112   wb  connects the main body  112   wa  and the protruding flow path  140 . The protrusion  112   wb  can prevent gas from entering the protruding flow path  140 . 
     The length (Lw 2 ) of the protrusion  112   wb  along the X direction is substantially equal to the length (Lw 1 ) of the main body  112   wa  along the X direction. The length (Ww 2 ) of the protrusion  112   wb  along the Y direction is shorter than the length (Ww 1 ) of the main body  112   wa  along the Y direction. 
     For example, it is preferable that the length (Hw 2 ) of the protrusion  112   wb  along the Z direction is shorter than the length (Hw 1 ) along the main body  112   wa . However, the length (Hw 2 ) of the protrusion  112   wb  along the Z direction may be substantially equal to the length (Hw 1 ) along the main body  112   wa.    
     Here, the flow path inlet  140 P is defined by the second end  140   b , the surface of the protruding wall  112   w  on the protruding flow path  140  side, and the protrusion  112   wb . The flow path inlet  140 P is closed in the short direction (Y direction) of the tank chamber  114  and the straight advancing direction (Z direction) of the protruding flow path  140 . On the other hand, the flow path inlet  140 P is open in the longitudinal direction (X direction) of the tank chamber  114 . Therefore, it is possible to suppress the liquid from staying in the tank chamber  114  by the protrusion  112   wb.    
     In the tank  100  shown in  FIGS. 2A to 4B , the flow path inlet  140 P is located on the +Z direction side of the protruding flow path  140 , but the flow path inlet  140 P may be located at a position different from the +Z direction side of the protruding flow path  140 . 
     Next, a tank  100  of a fourth example embodiment will be described with reference to  FIGS. 5A and 5B .  FIG. 5A  is a schematic cross-sectional perspective view of the tank  100  of the fourth example embodiment, and  FIG. 5B  is a schematic cross-sectional view of the tank  100  of the fourth example embodiment. The tank  100  of the fourth example embodiment shown in  FIGS. 5A and 5B  has a configuration similar to that of the tank  100  of the second example embodiment shown in  FIGS. 3A and 3B  except that the protruding flow path  140  has a through hole  140   s  and the protruding wall  112   w  covers the second end  140   b  of the protruding flow path  140 , and redundant description is omitted in order to avoid redundancy. The outer peripheral surface and the inner peripheral surface of the protruding flow path  140  each have a rectangular parallelepiped shape. However, the protruding flow path  140  may have a tubular shape, and the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may each have a cylindrical shape. The combination of the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may be arbitrary. 
     As shown in  FIGS. 5A and 5B , the protruding flow path  140  has the through hole  140   s  that connects the inside of protruding flow path  140  and the outside of the protruding flow path  140 . The through hole  140   s  penetrates the side of the protruding flow path  140 . Here, the through hole  140   s  is located on the second end  140   b  side of the protruding flow path  140  extending in the Z direction. 
     The height Hal of the through hole  140   s  with respect to the height Hr in the tank chamber  114  (the length along the Z direction from the second inner main surface  112   b  to the through hole  140   s ) may be 30% or more and 70% or less. When the height Hal of the through hole  140   s  is about 50% of the height Hr in the tank chamber  114 , the air hardly enters regardless of the attitude in the vertical direction. 
     The protruding flow path  140  has a tubular shape, and the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  each have a substantially rectangular parallelepiped shape. The through hole  140   s  is located on each of a surface on the +X direction side, a surface on the −X direction side, a surface on the +Y direction side, and a surface on the −Y direction side of the protruding flow path  140 . 
     In addition, here, the protruding flow path  140  is in contact with the protruding wall  112   w . Specifically, the opening of the second end  140   b  of the protruding flow path  140  is covered with the protruding wall  112   w . Therefore, since the liquid flows into the inside of the protruding flow path  140  from the side of the protruding flow path  140  via the through hole  140   s , it is possible to suppress the gas from entering the tank chamber outflow hole  130 . 
     As described above, the opening of the second end  140   b  of the protruding flow path  140  is covered with the protruding wall  112   w . Therefore, the flow path inlet  140 P into which liquid flowing through the protruding flow path  140  flows is defined around the through hole  140   s.    
     The protruding flow path  140  includes the flow path inlet  140 P into which liquid flows, the flow path outlet  140 Q from which liquid flows out, and the first flow path  140 R connecting the flow path inlet  140 P and the flow path outlet  140 Q. The flow path inlet  140 P faces a direction different from the direction (Z direction) in which the first flow path  140 R extends. By suppressing the liquid from flowing in along the direction in which the protruding flow path  140  extends, it is possible to suppress generation of bubbles in the liquid due to generation of a spiral and a wave in the flow path inlet  140 P. 
     In  FIGS. 5A and 5B , the through hole  140   s  is located on each of the surface on the +X direction side, the surface on the −X direction side, the surface on the +Y direction side, and the surface on the −Y direction side of the protruding flow path  140 , but the present example embodiment is not limited thereto. The through hole  140   s  may be located on any surface of the protruding flow path  140 . However, it is preferable that the through hole  140   s  is located along the longitudinal direction of the tank chamber  114 . For example, when the tank chamber  114  extends along the X direction, it is preferable that the through hole  140   s  is located on the surface on the +X direction side and the surface on the −X direction side of the protruding flow path  140 . This makes it possible to suppress entry of gas into the protruding flow path  140  regardless of the orientation or attitude of the tank  100 , and to suppress outflow of gas from the tank chamber outflow hole  130 . 
     In  FIGS. 5A and 5B , the protruding wall  112   w  of the housing  110  comes into contact with the second end  140   b  of the protruding flow path  140  and covers the second end  140   b  of the protruding flow path  140 , but the present example embodiment is not limited thereto. The protruding wall  112   w  may not be in contact with the second end  140   b  of the protruding flow path  140 , and the protruding flow path  140  may be open at the second end  140   b  of the protruding flow path  140 . 
     The tank  100  of the first to fifth example embodiments is suitably used as a cooler for cooling a heat source. When the tank  100  is used as a cooler, the liquid in the tank  100  functions as so-called refrigerant. 
     The tank  100  of the first to fifth example embodiments described with reference to  FIGS. 1 to 5B  may be used in combination with another member. In that case, it is preferable that the liquid flowing out of the tank chamber outflow hole  130  of the tank  100  flows in a direction different from the direction in which the liquid flows through the protruding flow path  140 . 
     Next, a cooler  200  of a fifth example embodiment will be described with reference to  FIG. 6A .  FIG. 6A  is a schematic cross-sectional perspective view of the cooler  200  of the fifth example embodiment. 
     The cooler  200  is suitably used for cooling heat generating components. The cooler  200  may cool an electronic device having a heating element inside. The cooler  200  may cool a circuit of an electronic device. Alternatively, the cooler  200  may cool a light source or the like of an electronic device. For example, the electronic device may be any of a server, a workstation, a projector, a laptop computer, and a two-dimensional display device. 
     As illustrated in  FIG. 6A , the cooler  200  includes a tank  100  and a cover  210 . The cover  210  is disposed on the tank chamber outflow hole  130  side of the tank  100 . The flow path outlet  140 Q has the tank chamber outflow hole  130 . The cover  210  covers the second outer main surface  111   b  of the tank  100 . The tank  100  may be any of the tanks  100  described above with reference to  FIGS. 1 to 5B . 
     Even in this example, the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  each have a cylindrical shape. However, the protruding flow path  140  may have a tubular shape, and the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may each have a rectangular parallelepiped shape. The combination of the outer peripheral surface and the inner peripheral surface of the protruding flow path  140  may be arbitrary. 
     The cover  210  is disposed to face the tank chamber outflow hole  130  of the tank  100 . The cover  210  is disposed away from the second outer main surface  111   b  of the housing  110  by a predetermined distance. The cooler  200  has a predetermined gap between the second outer main surface  111   b  of the housing  110  and the cover  210 . The liquid flowing out of the tank chamber outflow hole  130  of the tank  100  flows along the gap between the second outer main surface  111   b  of the housing  110  and the cover  210 . Therefore, a flow path is formed between the second outer main surface  111   b  of the housing  110  and the cover  210 . In the present specification, a flow path located between the second outer main surface  111   b  of the housing  110  and the cover  210  may be referred to as a “second flow path  210 R”. 
     The first flow path  140 R of the protruding flow path  140  extends in the Z direction, whereas the second flow path  210 R extends in a direction different from the Z direction. In this example, the second flow path  210 R extends in the X direction. 
     The cover  210  has an outflow hole  230 . The outflow hole  230  is located on the −Z direction side with respect to the second flow path  210 R. 
     An attachment port  232  connected to the outflow hole  230  is disposed outside the cover  210 . The attachment port  232  is located on the −Z direction side with respect to the cover  210 . The attachment port  232  has a cylindrical shape. The attachment port  232  is disposed to surround the outflow hole  230 . The inner diameter (length in the XY plane) of the attachment port  232  is larger than the hole diameter (length in the XY plane) of the outflow hole  230 . A pipe (not illustrated) through which liquid flows is attached to the attachment port  232 . 
     The outflow hole  230  is disposed at a position different from the tank chamber outflow hole  130 . Specifically, in the XY plane, the position of the outflow hole  230  is different from the position of the tank chamber outflow hole  130 . Therefore, even if the gas flows out from the tank chamber outflow hole  130 , it is possible to suppress the gas flowing out from the tank chamber outflow hole  130  from linearly moving to the outflow hole  230 . Therefore, it is possible to suppress a large amount of gas from continuously flowing out from the cooler  200 . 
     At least the tank  100  and the cover  210  constitute the second flow path  210 R. The liquid flowing out of the tank chamber outflow hole  130  of the tank  100  flows in the second flow path along a direction different from the direction in which the protruding flow path  140  extends. Since the liquid flowing out of the tank chamber outflow hole  130  of the tank  100  flows in a direction different from the direction in which the protruding flow path  140  extends, it is possible to suppress the gas from linearly moving in a short period according to the change of the attitude of the cooler  200 . 
     The cover  210  may be a cold plate. The cold plate is suitably used for cooling the heat source. 
     Next, a cooler  200  of a sixth example embodiment will be described with reference to  FIG. 6B .  FIG. 6B  is a schematic cross-sectional view of the cooler  200  of the sixth example embodiment. 
     As illustrated in  FIG. 6B , the cooler  200  includes the tank  100  and a cold plate  210 A as the cover  210 . The cold plate  210 A is disposed on the tank chamber outflow hole  130  side of the tank  100 . The cold plate  210 A is made of a material having higher thermal conductivity than that of the tank  100 . Typically, the cold plate  210 A is made of a metal such as copper or aluminum. 
     The cold plate  210 A has fins  212 . The fins  212  are disposed on a +Z direction-side surface of the cold plate  210 A. The fins  212  are configured by disposing a plurality of plate-shaped protrusions extending in the X direction in parallel. The fins  212  are disposed facing the tank chamber outflow hole  130  of the tank  100 . 
     As described above, the cover  210  includes the cold plate  210 A. The heat source is in contact with a −Z direction-side surface of the cold plate  210 A. As a result, the heat source can be efficiently cooled using the liquid flowing out of the tank  100 . 
     The second flow path  210 R is a heat exchange chamber  214  including the tank  100  and the cold plate  210 A. More specifically, the second component  110 T and the cold plate  210 A constitute the heat exchange chamber  214 . The cold plate  210 A has the fins  212  facing the tank chamber outflow hole  130  in the heat exchange chamber  214 . Therefore, the heat source can be efficiently cooled by the liquid. 
     Although the cooler  200  of the sixth example embodiment described with reference to  FIGS. 6A and 6B  includes the tank  100  and the cover  210 , the present example embodiment is not limited thereto. The cooler  200  may include the tank  100  together with a pump that circulates the liquid in the tank  100 . 
     Next, a cooler  200  of a seventh example embodiment will be described with reference to  FIG. 7 .  FIG. 7  is a schematic perspective view of the cooler  200  of the seventh example embodiment. 
     As illustrated in  FIG. 7 , the cooler  200  includes the tank  100 , the cold plate  210 A, and a pump  220 . The cold plate  210 A is located on the −Z direction side of the tank  100 . The pump  220  is located on the −X direction side of the tank  100 . The pump  220  is exposed to the outer surface of the cooler  200 . 
     The liquid flows into the cooler  200  through the tank chamber inflow hole  120 . The liquid in the cooler  200  flows out through the outflow hole  230 . 
     In this example, the tank chamber inflow hole  120  is located on the +Z direction side of the housing  110 . The outflow hole  230  is located on the +Z direction side of the housing  110 . Specifically, the tank chamber inflow hole  120  and the outflow hole  230  are located on the first outer main surface  111   a.    
     The attachment port  232  connected to the outflow hole  230  is disposed outside the housing  110 . The attachment port  232  is located on the +Z direction side of the housing  110 . The attachment port  232  has a cylindrical shape. The attachment port  232  is disposed to surround the outflow hole  230 . 
     In this example, the liquid flowing in from the tank chamber inflow hole  120  flows into the tank chamber  114 . The liquid flowing out of the tank chamber  114  flows out of the outflow hole  230  via the pump  220 . 
     Next, the cooler  200  of the seventh example embodiment will be described with reference to  FIG. 8 .  FIG. 8  is a schematic exploded perspective view of the cooler  200  of the seventh example embodiment. 
     As illustrated in  FIG. 8 , the cooler  200  includes the pump  220 , the first component  110 S, the second component  110 T, and the cold plate  210 A. The tank  100  includes the first component  110 S and the second component  110 T. The pump  220  has a fixed part  222  ( FIG. 9 ) and a rotating part  224  ( FIG. 9 ,  FIG. 10 ) that rotates with respect to the fixed part  222 . The pump  220  has a motor. The stator of the motor is accommodated in the fixed part. The rotor and the impeller of the motor are integrally formed in the rotating part. 
     The first component  110 S includes the tank chamber inflow hole  120 , the inflow attachment port  122 , the outflow hole  230 , the attachment port  232 , and a pump chamber  110   r . The pump chamber  110   r  is provided to be recessed on the first outer main surface  111   a . The pump chamber  110   r  is recessed in a size corresponding to the length (length along the X direction), the width (length along the Y direction), and the height (length along the Z direction) of the pump  220 , and the pump  220  is disposed in the pump chamber  110   r . More specifically, the impeller is disposed in the pump chamber  110   r , and the stator isolated from the pump chamber  110   r  is disposed in the +Z direction with respect to the pump chamber  110   r . The pump chamber  110   r  is provided with a flow path connected to the outflow hole  230  and a flow path connected to a protruding flow path  150 . 
     The second component  110 T has the protruding flow path  140 . The second component  110 T also has the protruding flow path  150 . When the first component  110 S and the second component  110 T are combined, the protruding flow path  140  is disposed in the tank chamber  114 , and the protruding flow path  150  connects the second flow path  210 R formed between the cold plate  210 A and the second component  110 T and the pump chamber  110   r.    
     The cooler  200  further includes the pump  220  connected to the second flow path  210 R. The pump  220  can circulate the liquid passing through the tank  100 . 
     Next, the cooler  200  of the seventh example embodiment will be described with reference to  FIGS. 7 to 10 .  FIG. 9  is a schematic cross-sectional view of the cooler  200  of the seventh example embodiment.  FIG. 10  is a schematic cross-sectional view of the cooler  200  of the seventh exemplary example embodiment. 
     As illustrated in  FIG. 9 , the pump  220  is disposed in the pump chamber  110   r  of the first component  110 S. More specifically, the impeller is disposed in the pump chamber  110   r , and the stator isolated from the pump chamber  110   r  is disposed in the +Z direction. The liquid flowing into the tank chamber  114  from the tank chamber inflow hole  120  of the tank  100  flows through the protruding flow path  140 , the tank chamber outflow hole  130 , the heat exchange chamber  214 , and the pump chamber  110   r  in this order, and flows out from the outflow hole  230 . Since the liquid flowing out of the tank chamber  114  after flowing into the tank chamber  114  from the tank chamber inflow hole  120  does not directly flow into the pump chamber  110   r , gas can be suppressed from entering the pump chamber  110   r.    
     As illustrated in  FIG. 10 , in the cooler  200 , it is preferable that the tank chamber outflow hole  130  is disposed at a position facing the center of the fin  212 . As a result, the liquid can be circulated throughout the cold plate  210 A. 
     The example embodiments of the present disclosure are described above with reference to the drawings. However, the present disclosure is not limited to the above example embodiments, and can be implemented in various aspects without departing from the range of the gist of the present disclosure. Additionally, the plurality of components disclosed in the above example embodiments can be appropriately modified. For example, one component of all components shown in one example embodiment may be added to a component of another example embodiment, or some components of all components shown in one example embodiment may be eliminated from the one example embodiment. 
     The drawings schematically illustrate each component mainly to facilitate understanding of the disclosure, and thus each illustrated component may be different in thickness, length, number, interval, or the like from actual one for convenience of creating the drawings. The configuration of each component described in the above example embodiments is an example, and is not particularly limited. Thus, it is needless to say that various modifications can be made without substantially departing from the range of effects of the present disclosure. 
     The present disclosure is suitably used for a tank and a cooler. 
     Features of the above-described example embodiments and the modifications thereof may be combined appropriately as long as no conflict arises. 
     While example embodiments of the present disclosure have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present disclosure. The scope of the present disclosure, therefore, is to be determined solely by the following claims.