Patent Publication Number: US-11047385-B2

Title: Electric compressor having compression portion and motor chamber communication via passage in flange of shaft support member

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to Japanese Patent Application No. 2018-070075 filed on Mar. 30, 2018, the entire disclosure of which is incorporated herein by reference. 
     BACKGROUND ART 
     The present disclosure relates to an electric compressor including a motor housing, a compressor housing, and a shaft support member. 
     An electric compressor in which a movable scroll is driven by an electric motor commonly includes a bottomed cylindrical motor housing, a bottomed cylindrical compressor housing, and a shaft support member. The motor housing accommodates the electric motor. The compressor housing accommodates a compression portion including a fixed scroll and a movable scroll. The shaft support member supports a rotary shaft, and includes a flange portion disposed in an outer peripheral portion of the shaft support member (see, for example, Japanese Patent Application Publication No. 2011-89507). 
     In Japanese Patent Application Publication No. 2011-89507, the proximal portion of a flange portion that is disposed at one end of a shaft support member in the thickness direction of the shaft support member is fitted onto an inner peripheral surface of a first housing (motor housing). The flange portion of the shaft support member is interposed between and tightly held by an end face of an open end of the first housing and an end face of an open end of a second housing. In the shaft support member according to Japanese Patent Application Publication No. 2011-89507, a plurality of suction passages extends in an axial direction and a radial direction of a rotary shaft, and is formed radially outward of a bearing holding portion. Then, a refrigerant gas is introduced from a suction port into a compression portion through a gap formed in an electric motor and the suction passages of the shaft support member. 
     In the shaft support member according to Japanese Patent Application Publication No. 2011-89507, the suction passages communicating with the compression portion are formed inward of a fitted surface of the shaft support member that is fitted onto the motor housing. This configuration decreases rigidity of the shaft support member, thereby making it difficult to suppress vibration of the compression portion and the rotary shaft and occurrence of noise. However, if the suction passages are formed outward of the fitted surface, the housing including the shaft support member is radially increased. 
     The present disclosure, which has been made in light of the above-described problem, is directed to providing an electric compressor that is excellent in quietness while suppressing an increase in a radial direction of a housing. 
     SUMMARY 
     In accordance with an aspect of the present invention, there is provided an electric compressor that includes a housing including a motor housing, a compressor housing, and a shaft support member, a rotary shaft, an electric motor, a compression portion, and a fluid passage. The rotary shaft is accommodated in the housing. The electric motor is accommodated in the housing and configured to rotate the rotary shaft. The compression portion is accommodated in the housing and configured to be driven by rotation of the rotary shaft to compress a fluid. The motor housing has a bottomed cylindrical shape and accommodates the electric motor. The compressor housing has a bottomed cylindrical shape and accommodates the compression portion. The shaft support member is interposed between and held by a first end face of an open end of the motor housing and a second end face of an open end of the compressor housing. The shaft support member cooperates with the motor housing to form a motor chamber that accommodates the electric motor, and cooperates with the compressor housing to form a compression chamber that accommodates the compression portion. The shaft support member has an insertion hole through which the rotary shaft is inserted, and rotatably supports the rotary shaft. The shaft support member, the motor housing, and the compressor housing are fastened with a fastening member to form the housing. The motor chamber is in communication with the compression portion through the fluid passage. The first end face has a first fastening hole into which the fastening member is inserted and a first recessed portion formed in communication with the motor chamber. The second end face has a second fastening hole into which the fastening member is inserted and a second recessed portion formed in communication with the compression chamber. The shaft support member has a fitted surface fitted onto an opening of the motor housing and a flange portion extending from the fitted surface and interposed between and held by the first end face and the second end face. The flange portion has a through hole through which the fastening member is inserted and a passage-forming hole through which the first recessed portion and the second recessed portion are in communication with each other. The through hole and the passage-forming hole are arranged in a circumferential direction of the flange portion. The fluid passage is formed at least by the first recessed portion, the second recessed portion, and the passage-forming hole. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure together with objects and advantages thereof, may best be understood by reference to the following description of the embodiment together with the accompanying drawings in which; 
         FIG. 1  is a cross-sectional view of a scroll type compressor according to an embodiment; 
         FIG. 2  is an exploded perspective view of a shaft support member, a motor housing, and an electric motor; 
         FIG. 3  is a view of the inside of the scroll type compressor viewed from a fixed scroll side; and 
         FIG. 4  is a cross-sectional view of the inside of the scroll type compressor taken along line IV-IV in  FIG. 1  viewed from a motor housing side. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     An embodiment of the present disclosure in which an electric compressor is embodied as a scroll type compressor will be described below with reference to  FIGS. 1 to 4 . 
     As illustrated in  FIG. 1 , an electric compressor, which is in this embodiment, is a scroll type compressor  10 , includes a housing H in which an inlet Ha and an outlet Hb are formed. A fluid (refrigerant gas in the present embodiment) is introduced from the inlet Ha and is discharged from the outlet Hb. The housing H has a substantially cylindrical shape as a whole. The scroll type compressor  10  includes, more specifically, the housing H includes a motor housing  11  having a bottomed cylindrical shape, a compressor housing  21  having a bottomed cylindrical shape, and a shaft support member  31  having a disc shape and disposed between the motor housing  11  and the compressor housing  21 . The motor housing  11 , the compressor housing  21 , and the shaft support member  31  are assembled such that an end face of an open end of the motor housing  11  and an end face of an open end of the compressor housing  21 , which are explained later, are in contact with the shaft support member  31 . 
     The inside of the housing H is separated into a motor chamber S 1  and a compression chamber S 2  by the shaft support member  31 . The shaft support member  31  cooperates with the motor housing  11  to form the motor chamber S 1 , and an electric motor  16  is accommodated in the motor chamber S 1 . The shaft support member  31  cooperates with the compressor housing  21  to form the compression chamber S 2 , and a compression portion  15  is accommodated in the compression chamber S 2 . 
     The inlet Ha is formed in a side wall portion  11   a  of the motor housing  11 , specifically, at a position in the side wall portion  11   a  adjacent to a bottom portion  11   b  of the motor housing  11 , and is in communication with the motor chamber S 1 . The outlet Hb is formed in a bottom portion  21   a  of the compressor housing  21 . The compression portion  15  accommodated in the compression chamber S 2  introduces and compresses the fluid, which has been introduced into the motor chamber S 1  from the inlet Ha, and then discharges the fluid from the outlet Hb. The electric motor  16  accommodated in the motor chamber S 1  configured to drive the compression portion  15 . A rotary shaft  17 , the compression portion  15 , and the electric motor  16  are accommodated in the housing H. That is, the compression portion  15  is accommodated in the housing H, and is configured to be driven by rotation of the rotary shaft  17  to compress the fluid. The electric motor  16  is disposed adjacent to the inlet Ha in the housing H, and the compression portion  15  is disposed adjacent to the outlet Hb in the housing H. 
     The rotary shaft  17  is rotatably accommodated in the housing H. The shaft support member  31  rotatably supporting a part of the rotary shaft  17  is interposed between the compression portion  15  and the electric motor  16 . The shaft support member  31  has therethrough an insertion hole  32  through which the rotary shaft  17  is inserted, and a first bearing  18  is disposed in the insertion hole  32 . The shaft support member  31  and the bottom portion  11   b  of the motor housing  11  face each other in an axial direction of the rotary shaft  17 , and a cylindrical boss  19  protrudes from the bottom portion  11   b  of the motor housing  11  toward the motor chamber S 1 . A second bearing  20  is disposed inside the boss  19 . The rotary shaft  17  is rotatably supported by both the bearings  18 ,  20 . 
     In the housing H, a fluid passage, which, in this embodiment, is a suction passage  25  is formed for directing the fluid, which has been introduced into the motor chamber S 1  from the inlet Ha, from the motor chamber S 1  to the compression portion  15 . In other words, the motor chamber S 1  is in communication with the compression portion  15  through the suction passage  25 . The compression portion  15  is configured to compress the fluid introduced into the compression portion  15  through the suction passage  25 , and includes a fixed scroll  41  fixed to the housing H and a movable scroll  42  configured to revolve, specifically, configured to make an orbital motion, with respect to the fixed scroll  41 . 
     The fixed scroll  41  is fixed to an inner peripheral surface of a peripheral wall portion  21   b  of the compressor housing  21 . The fixed scroll  41  includes a base plate  41   a  having a disc shape and disposed coaxially with the rotary shaft  17 , an outer wall portion  41   b  extending from the base plate  41   a  along the inner peripheral surface of the peripheral wall portion  21   b , and a scroll wall  41   c  extending from the base plate  41   a  and disposed inward of the outer wall portion  41   b  in a radial direction of the fixed scroll  41 . The outer wall portion  41   b  surrounds the scroll wall  41   c . A suction hole  41   d  for introducing the fluid into the inside of the outer wall portion  41   b  is formed through the outer wall portion  41   b  in a thickness direction of the outer wall portion  41   b.    
     The movable scroll  42  includes a base plate  42   a  having a disc shape and facing the base plate  41   a  and a scroll wall  42   b  extending from the base plate  42   a  toward the base plate  41   a . The fixed scroll  41  and the movable scroll  42  are meshed with each other. Specifically, the scroll wall  41   c  and the scroll wall  42   b  are meshed with each other on the radially inner side with respect to the outer wall portion  41   b , a top end face of the scroll wall  41   c  is in contact with the base plate  42   a , and a top end face of the scroll wall  42   b  is in contact with the base plate  41   a , A fluid compression chamber  24  in which the fluid is compressed is defined by the fixed scroll  41  and the movable scroll  42 . 
     The insertion hole  32  of the shaft support member  31  is closed by the base plate  42   a  of the movable scroll  42 , so that a back pressure chamber  47  is defined by a wall of the insertion hole  32  and the movable scroll  42 . The fluid compressed in the fluid compression chamber  24  is introduced into the back pressure chamber  47 . This causes the pressure in the back pressure chamber  47  to become higher than the suction pressure, and urges the movable scroll  42  against the fixed scroll  41 . This configuration enhances the sealing of the fluid compression chamber  24  by resisting compression reaction force that occurs along the axial direction of the rotary shaft  17  and acts on the movable scroll  42  while the compression portion  15  is driven. 
     The movable scroll  42  is configured to make an orbital motion in conjunction with rotation of the rotary shaft  17 . Specifically, a part of the rotary shaft  17  protrudes toward the compression portion  15  through the insertion hole  32  of the shaft support member  31 . An eccentric pin  43  is disposed at a position that is eccentric with respect to an axis L of the rotary shaft  17  on an end face of the rotary shaft  17  adjacent to the compression portion  15 . A bushing  44  is disposed for the eccentric pin  43 . The bushing  44  and the movable scroll  42  (specifically, the base plate  42   a ) are connected via a bearing  45 . 
     The scroll type compressor  10  includes an anti-rotation part  46  that is disposed on an outer peripheral portion of the shaft support member  31  to restrict rotation of the movable scroll  42  while allowing orbital motion of the movable scroll  42 . Note that a plurality of the anti-rotation parts  46  is disposed in this embodiment. As the rotary shaft  17  rotates in a predetermined forward direction, the movable scroll  42  makes an orbital motion in the forward direction. The movable scroll  42  makes an orbital motion in the forward direction about an axis of the fixed scroll  41  (that is, the axis L of the rotary shaft  17 ). 
     This reduces the volume of the fluid compression chamber  24 , so that the fluid introduced into the motor chamber S 1  from the inlet Ha flows through a gap formed in the electric motor  16  and reaches the suction passage  25 . After the fluid flows into the compression chamber S 2  through the suction passage  25 , the fluid is introduced into the fluid compression chamber  24  through the suction hole  41   d , which is formed through the outer wall portion  41   b  of the fixed scroll  41 , and is compressed in the fluid compression chamber  24 . The compressed fluid is discharged from a discharge port  48  formed through the base plate  41   a , and thereafter is discharged from the outlet Hb. A discharge valve  49  configured to cover the discharge port  48  is disposed on the base plate  41   a . The fluid compressed in the fluid compression chamber  24  pushes out the discharge valve  49  and is discharged from the discharge port  48 . 
     The electric motor  16  rotates the rotary shaft  17  to revolve the movable scroll  42 . The electric motor  16  includes a rotor  51  rotating integrally with the rotary shaft  17  and a stator  52  surrounding the rotor  51 . The rotor  51  is connected to the rotary shaft  17 . The rotor  51  includes a permanent magnet (not illustrated). The stator  52  is fixed to an inner peripheral surface of the side wall portion  11   a  of the housing H (specifically, the motor housing  11 ). The stator  52  includes a stator core  53  facing the cylindrical rotor  51  in a radial direction of the rotor  51  and a coil  54  that is wound in the stator core  53 . The coil  54  includes coil ends  54   a  protruding from opposite end faces of the stator core  53  in an axial direction of the stator core  53 . In other words, the electric motor  16  includes a pair of coil ends  54   a , and the coil ends  54   a  are respectively disposed on opposite sides of the electric motor  16  in the axial direction of the rotary shaft  17 . 
     The scroll type compressor  10  includes an inverter  55  serving as a drive circuit configured to drive the electric motor  16 . The inverter  55  is accommodated in the housing H, specifically, accommodated in a cylindrical cover member  56  that is attached to the bottom portion  11   b  of the motor housing  11 . The inverter  55  and the coil  54  are electrically connected. 
     Next, the motor housing  11 , the compressor housing  21 , and the shaft support member  31  will be described in detail. 
     As illustrated in  FIGS. 1 and 2 , a first flange  12  is disposed at the open end of the motor housing  11 . The first flange  12  protrudes outward from the open end of the motor housing  11  in a radial direction of the motor housing  11  and over entirety in a circumferential direction of the motor housing  11 . The first flange  12  of the motor housing  11 , which is disposed at the open end of the motor housing  11 , has a first end face  12   b  that is disposed in contact with the shaft support member  31 . The first end face  12   b  of the motor housing  11  has a plurality of first fastening holes, which, in this embodiment, is a plurality of first female threaded portions  12   a , such that the first female threaded portions  12   a  are recessed in the axial direction of the rotary shaft  17 . The first female threaded portions  12   a  are spaced from each other at equal distances in the circumferential direction of the motor housing  11 . 
     The first end face  12   b  of the motor housing  11  has a plurality of first recessed portions  13 . The first recessed portions  13  are recessed in an inner peripheral surface of the first flange  12  toward an outer peripheral surface of the first flange  12  in a radial direction of the first flange  12 , and are formed in communication with the motor chamber S 1 . The first recessed portion  13  allows the first end face  12   b  to communicate with the inside of the motor housing  11 , i.e., the motor chamber S 1 . The first recessed portions  13  are spaced from each other at equal distances in the circumferential direction of the motor housing  11 . The first female threaded portions  12   a  and the first recessed portions  13  are alternately disposed in the circumferential direction of the motor housing  11 . 
     At least a part of the first recessed portion  13  faces, in a radial direction of the rotary shaft  17 , an outer peripheral surface of one coil end  54   a  of the coil ends  54   a  of the electric motor  16  that is closer to the shaft support member  31  than the other coil end  54   a . Since the plurality of first recessed portions  13  is disposed in the circumferential direction of the motor housing  11 , the plurality of first recessed portions  13  faces the outer peripheral surface of the one coil end  54   a  at a plurality of positions. 
     As illustrated in  FIGS. 1 and 3 , a second flange  22  is disposed at the open end of the compressor housing  21 . The second flange  22  protrudes outward from the open end of the compressor housing  21  in a radial direction of the compressor housing  21  and over entirety in a circumferential direction of the compressor housing  21 . The second flange  22  of the compressor housing  21 , which is disposed at the open end of the compressor housing  21 , has a second end face  22   b  that is disposed in contact with the shaft support member  31 . The second end face  22   b  of the compressor housing  21  has a plurality of second fastening holes, which, in this embodiment, is a plurality of second female threaded portions  22   a . The second female threaded portions  22   a  are recessed in the axial direction of the rotary shaft  17 , specifically, are formed through the second flange  22  in a thickness direction of the second flange  22 . The second female threaded portions  22   a  are spaced from each other at equal distances in the circumferential direction of the compressor housing  21 . 
     The second end face  22   b  of the compressor housing  21  has a plurality of second recessed portions  23 . The second recessed portions  23  are recessed in an inner peripheral surface of the second flange  22  toward an outer peripheral surface of the second flange  22  in a radial direction of the second flange  22 , and are formed in communication with the compression chamber  52 . The second recessed portion  23  allows the second end face  22   b  to communicate with the inside of the compressor housing  21 , i.e., the compression chamber S 2 . The second recessed portions  23  are spaced from each other at equal distances in the circumferential direction of the compressor housing  21 . The second female threaded portions  22   a  and the second recessed portions  23  are alternately disposed in the circumferential direction of the compressor housing  21 . 
     As illustrated in  FIGS. 1 and 2 , an insertion hole  32  is formed through the shaft support member  31  in a thickness direction of the shaft support member  31  at a radial center portion of the shaft support member  31 . A flange portion  33  is disposed on an outer peripheral portion of the shaft support member  31 . The shaft support member  31  includes a fitted portion  34  whose outer peripheral surface is fitted onto the inner peripheral surface of the first flange  12  of the motor housing  11 . In other words, the shaft support member  31  has a fitted surface, which in this embodiment, is the outer peripheral surface of the fitted portion  34  that is fitted onto an opening of the motor housing  11 . The fitted portion  34  has a cylindrical shape, and the insertion hole  32  is formed through a center portion of the fitted portion  34 . The fitted portion  34  includes a small-diameter portion  34   a  adjacent to the electric motor  16 , and the first bearing  18  is disposed in and supported by the small-diameter portion  34   a . Since the outer peripheral surface of the fitted portion  34  serving as a fitted surface is fitted onto the opening of the motor housing  11 , the axis L of the rotary shaft  17  supported by the shaft support member  31  is easily matched with a center axis of the motor housing  11 . The flange portion  33  extends from the outer peripheral surface of the fitted portion  34 . 
     A plurality of through holes  33   a  is formed through the flange portion  33  of the shaft support member  31  in a thickness direction of the flange portion  33 , and the through holes  33   a  are spaced from each other at equal distances in a circumferential direction of the flange portion  33 . A plurality of passage-forming holes  35  is formed through the flange portion  33  in the thickness direction of the flange portion  33 . The passage-forming holes  35  are spaced from each other at equal distances in the circumferential direction of the flange portion  33 . Each of the passage-forming holes  35  has an elongated hole shape that extends in the circumferential direction of the flange portion  33 . Specifically, the passage-forming hole  35  extends in an arc shape along the circumferential direction of the flange portion  33 . The flange portion  33  has the through holes  33   a  and the passage-forming holes  35  that are arranged alternately in the circumferential direction of the flange portion  33 . The through holes  33   a  and the passage-forming holes  35  are formed outward of the outer peripheral surface (fitted surface) of the fitted portion  34 . 
     As illustrated in  FIG. 1 , in the housing H, the first end face  12   b  of the motor housing  11  is disposed in contact with one surface of opposite surfaces of the flange portion  33  of the shaft support member  31  in the thickness direction of the flange portion  33 , and the second end face  22   b  of the compressor housing  21  is disposed in contact with the other surface of the flange portion  33  in the thickness direction of the flange portion  33 . 
     Each of the first female threaded portions  12   a  of the first flange  12  is in communication with the corresponding second female threaded portion  22   a  of the second flange  22  through the through hole  33   a  of the flange portion  33 . The first flange  12 , the flange portion  33 , and the second flange  22  are fastened with fastening members, which, in this embodiment, are bolts  26 , to form the housing H. Each of the bolts  26  is inserted into the first female threaded portion  12   a  of the first flange  12 , through the through hole  33   a  of the flange portion  33  and the second female threaded portion  22   a  of the second flange  22  with the flange portion  33  interposed between the first female threaded portion  12   a  and the second female threaded portion  22   a . In the housing H, the flange portion  33  is interposed between and tightly held by the first end face  12   b  of the motor housing  11  and the second end face  22   b  of the compressor housing  21 . 
     As illustrated in  FIGS. 1 and 4 , the first recessed portion  13  of the motor housing  11  and the second recessed portion  23  of the compressor housing  21  are in communication with each other through the passage-forming hole  35  of the flange portion  33 . The passage-forming hole  35  faces the whole of an opening of the first recessed portion  13  formed in the first end face  12   b , and faces the whole of an opening of the second recessed portion  23  formed in the second end face  22   b.    
     A part of an inner surface of the passage-forming hole  35  adjacent to an outer peripheral surface of the flange portion  33  is continuous with a part of an inner surface of the first recessed portion  13  adjacent to the outer peripheral surface of the first flange  12  along the axial direction of the rotary shaft  17 . In addition, the part of the inner surface of the passage-forming hole  35  adjacent to the outer peripheral surface of the flange portion  33  is continuous with a part of an inner surface of the second recessed portion  23  adjacent to the outer peripheral surface of the second flange  22  along the axial direction of the rotary shaft  17 . Further, a part of the inner surface of the passage-forming hole  35  adjacent to the fixed scroll  41  is continuous with a part of an outer peripheral surface of the outer wall portion  41   b  along the axial direction of the rotary shaft  17 . 
     In the housing H, the suction passage  25  serving as a fluid passage is formed at least by the first recessed portion  13 , the passage-forming hole  35 , and the second recessed portion  23 . The suction passage  25  allows the motor chamber S 1  and the suction hole  41   d  of the compression portion  15  to communicate with each other. Specifically, the suction passage  25  is a passage which directs the fluid, which will be introduced into the fluid compression chamber  24  through the suction hole  41   d , from the motor chamber S 1  to the suction hole  41   d.    
     The suction passage  25  is formed outward of the back pressure chamber  47  in a radial direction of the shaft support member  31 , and the passage-forming hole  35  constituting a part of the suction passage  25  is formed through the flange portion  33  of the shaft support member  31 . The flange portion  33  is a section that constitutes a part of an outer peripheral surface of the housing H, and is a section that is interposed between and held by the motor housing  11  and the compressor housing  21  when the motor housing  11 , the shaft support member  31 , and the compressor housing  21  are fastened with the shaft support member  31  interposed between the motor housing  11  and the compressor housing  21 . That is, the flange portion  33  is an existing joining surface where the motor housing  11  and the compressor housing  21  face each other via the flange portion  33 . Therefore, in the shaft support member  31 , the passage-forming hole  35  is not formed in the fitted portion  34  that has the insertion hole  32 , but is formed outward of the outer peripheral surface (fitted surface) of the fitted portion  34  in the radial direction of the shaft support member  31 . 
     Next, operation of the scroll type compressor  10  will be described. 
     When the rotary shaft  17  is rotated by power supply to the electric motor  16 , the bushing  44  revolves around the rotary shaft  17  and the movable scroll  42  revolves. Then, the fluid is introduced into the housing H, specifically, introduced into the motor chamber S 1  in the housing H from the inlet Ha. The fluid passes through the gap formed in the electric motor  16  while contacting the coil end  54   a  of the coil ends  54   a  that is closer to the bottom portion  11   b  of the motor housing  11  than the other coil end  54   a , and flows in the axial direction of the rotary shaft  17 . 
     While contacting the coil end  54   a  that is closer to the shaft support member  31  than the other coil end  54   a , the fluid is introduced into the suction passage  25  from the first recessed portion  13 , and flows through the passage-forming hole  35  and the second recessed portion  23  into the compression chamber S 2  in the compressor housing  21 . Then, the fluid is introduced into the compression portion  15  from the suction hole  41   d . The fluid introduced into the fluid compression chamber  24  of the compression portion  15  is compressed by the orbital motion of the movable scroll  42 , and the compressed fluid is discharged from the discharge port  48 , then pushes out the discharge valve  49  and is discharged from the outlet Hb. Note that the highly-compressed fluid is introduced into the back pressure chamber  47  as a control gas, and this control gas presses the movable scroll  42  against the fixed scroll  41  in the axial direction of the rotary shaft  17 . 
     The above embodiment of the present disclosure offers the following effects. 
     (1) Each of the passage-forming holes  35 , which is a part of the suction passage  25 , is formed in the flange portion  33  of the shaft support member  31 , which the bolts  26  are inserted through to form the housing H. That is, the passage-forming hole  35  is not formed in the fitted portion  34  that has the insertion hole  32 , but is formed outward of the outer peripheral surface (fitted surface) of the fitted portion  34  in the radial direction of the shaft support member  31 . The passage-forming hole  35  and the through hole  33   a  are arranged in the circumferential direction of the flange portion  33 . This configuration allows the suction passage  25  to pass through the existing joining surface without an increase in the diameter of the flange portion  33 . This configuration does not cause a decrease in rigidity of the fitted portion  34 , i.e., the shaft support member  31 , thereby easily suppressing vibration of the rotary shaft  17  and obtaining excellent quietness in the scroll type compressor  10 . 
     (2) The passage-forming hole  35  is formed through the flange portion  33 , which the bolts  26  are inserted through to fasten the motor housing  11  and the compressor housing  21 . More specifically, in the flange portion  33 , the passage-forming hole  35  is interposed between adjacent through holes  33   a  for receiving the bolts  26  in the circumferential direction of the flange portion  33 . This configuration suppresses an increase in diameter of the shaft support member  31 , thereby suppressing an increase in diameter of the housing H by effectively using the flange portion  33  for coupling between the motor housing  11  and the compressor housing  21 . 
     (3) The motor housing  11  and the compressor housing  21  are fastened with the bolts  26  that is inserted through the flange portion  33  with the flange portion  33  interposed between and held by the motor housing  11  and the compressor housing  21 . The flange portion  33  is held in the thickness direction of the flange portion  33 . This configuration increases support rigidity of the shaft support member  31  that supports the rotary shaft  17 . Therefore, this configuration suppresses vibration of the shaft support member  31 , which is caused by vibration of the rotary shaft  17 , and obtains excellent quietness in the scroll type compressor  10 , (4) The passage-forming hole  35  formed through the flange portion  33  of the shaft support member  31  has an elongated hole shape that extends in the circumferential direction of the flange portion  33 . This configuration easily secures a flow passage cross-sectional area in a part of the suction passage  25  formed by the passage-forming hole  35  without an increase in diameter of the flange portion  33 . 
     (5) The first recessed portion  13  is formed in the first flange  12 , and the second recessed portion  23  is formed in the second flange  22 . This configuration effectively uses the first flange  12  and the second flange  22 , which is for coupling between the motor housing  11  and the compressor housing  21 , to form the suction passage  25 , and suppresses an increase in diameter of the housing H. 
     (6) At least a part of the first recessed portion  13  faces, in the radial direction of the rotary shaft  17 , the outer peripheral surface of the one coil end  54   a  closer to the shaft support member  31  than the other coil end  54   a . Therefore, the fluid introduced into the suction passage  25  from the motor chamber S 1  is brought into contact with the coil end  54   a  closer to the shaft support member  31 . In addition, the fluid introduced from the inlet Ha is brought into contact with the other coil end  54   a  closer to the bottom portion  11   b  of the motor housing  11 . Accordingly, this configuration enables both the coil ends  54   a  to be cooled by the fluid. 
     (7) A part of the inner surface of the passage-forming hole  35  adjacent to the fixed scroll  41  is continuous with the outer peripheral surface of the outer wall portion  41   b  of the fixed scroll  41  in the axial direction of the rotary shaft  17 . This prevents the outer wall portion  41   b  from closing a part of the passage-forming hole  35 , thereby suppressing a decrease in the flow passage cross-sectional area of the suction passage  25 . 
     Note that the above embodiment may be modified as follows. 
     Each of the passage-forming holes  35  may not have an elongated hole shape that extends in the circumferential direction of the flange portion  33 . For example, the passage-forming hole  35  may have a round hole shape or an elliptical hole shape. 
     In the above embodiment, the plurality of passage-forming holes  35 , the plurality of first recessed portions  13 , and the plurality of second recessed portions  23  are formed. However, the number of passage-forming holes  35 , the number of first recessed portions  13 , and the number of second recessed portions  23  are not limited. A single passage-forming hole  35 , a single first recessed portion  13 , and a single second recessed portion  23  may be formed. 
     The passage-forming holes  35 , the first recessed portions  13 , and the second recessed portions  23  may be spaced from each other at different distances. 
     The inner surface of each of the passage-forming holes  35  adjacent to the rotary shaft  17  may not be continuous with the outer peripheral surface of the outer wall portion  41   b.    
     Each of the first recessed portions  13  may not face the one coil end  54   a  closer to the shaft support member  31  than the other coil end  54   a  in the radial direction of the rotary shaft  17 . 
     The first recessed portion  13  may face the whole of the one coil end  54   a  closer to the shaft support member  31  than the other coil end  54   a  in the radial direction of the rotary shaft  17 . 
     If the scroll type compressor  10  is configured to discharge the fluid compressed by the compression portion  15  from an outlet formed in the motor housing  11  into the motor chamber S 1 , the fluid passage, which is formed by the first recessed portion  13 , the passage-forming hole  35 , and the second recessed portion  23 , serves as a discharge passage. 
     The first recessed portion  13  may be a through hole that is formed through the first flange  12  to allow the first end face  12   b  and the motor chamber S 1  to communicate with each other. 
     The second recessed portion  23  may be a through hole that is formed through the second flange  22  to allow the second end face  22   b  and the compression chamber S 2  to communicate with each other. 
     The compression portion  15  is not limited to a scroll type that includes the fixed scroll  41  and the movable scroll  42 . The compression portion  15  may be a type such as a piston type or a vane type. 
     In the embodiment, each of the suction passages  25  includes the first recessed portion  13 , the passage-forming hole  35 , and the second recessed portion  23 ; however, the suction passage  25  (fluid passage) may include a hole formed in another member. 
     The first fastening hole and the second fastening hole may be formed without female thread, and a through bolt may be employed as the fastening member. In this case, the motor housing  11 , the shaft support member  31 , and the compressor housing  21  may be fastened by a nut and the through bolt, which is inserted through the first fastening hole, the through hole  33   a , and the second fastening hole, to form the housing H.