JP2019178612A - Check valve with no spring for compressor - Google Patents

Abstract

To provide a check valve with no spring for a compressor, capable of suppressing the inclination of a valve element when the valve element is moved even if the thickness of the valve element is reduced.SOLUTION: The check valve with no spring for the compressor includes a valve seat member 50, and a valve element 60, the valve element 60 including a plate-like part 61, and a protruded part 62 protruded from a central portion of a surface 61a of the plate-like part 61 to the side where a valve hole 51 is located. With the movement of the valve element 60 in a closing direction as the direction of closing the valve hole 51, the protruded part 62 is inserted into the valve hole 51 to cause the flow path cross section area of the valve hole 51 to be narrower, resulting in the movement assist of the valve element 60 in the closing direction. Inside the valve element 60, a recessed part 65 is formed opening on a reverse 61b of the plate-like part 61 and extending in the protruded part 62. Into the recessed part 65, a guide part 75 is inserted for guiding the movement of the valve element 60 in the opening/closing direction.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a springless check valve for a compressor.

  The compressor includes a check valve for preventing the refrigerant from flowing backward. The check valve generally includes a valve seat member that forms a valve hole, a valve body that opens and closes the valve hole by being separated from the valve seat member, a spring that biases the valve body in a valve closing direction, and a valve body And a guide part for stably moving. The check valve disclosed in Japanese Patent Application Laid-Open No. 2012-149615 (Patent Document 1) does not include the above-described spring for closing the valve, and as a means for moving the valve body in the valve closing direction, a reverse flow is provided. The differential pressure generated by the fluid force of the incoming refrigerant is used.

JP2012-149615A

  When the check valve includes a spring for closing the valve, the valve body comes into contact with the valve seat member by the biasing force of the spring, and the valve hole is closed. When the valve hole is opened, the valve closing spring becomes a resistance against the valve body that moves in the valve opening direction. When the check valve does not have a spring for closing like the check valve disclosed in Patent Document 1, resistance (pressure loss) acting on the valve body when the valve is opened can be reduced and It is also possible to reduce the size and weight of the stop valve and the compressor.

  Making the thickness of the valve body thinner leads to weight reduction of the valve body itself, and the valve body becomes easier to move. For example, if the check valve does not include a spring for closing the valve, it is not necessary to form a part (spring seat) for positioning the spring in the valve body. It becomes possible. However, if the thickness of the valve body is reduced without implementing special measures, the valve body tends to tilt when the valve body moves, making it difficult for the valve body to stably open and close the valve hole. Can be.

  The present invention provides a springless check valve for a compressor that can suppress the inclination of the valve body when the valve body moves even when the thickness of the valve body is reduced. Objective.

  The springless check valve for a compressor according to the present invention allows the refrigerant to flow in the forward direction, restricts the refrigerant from flowing in the reverse direction, and controls the valve body by the flow of the refrigerant in the reverse direction. A non-spring check valve for a compressor that closes the valve hole with a valve having the valve hole through which the refrigerant passes and a valve seat formed on the downstream side of the valve hole in the forward direction. A seat member; and the valve body disposed on the downstream side of the valve seat member in the forward direction, the valve body having a plate-like portion having a front surface and a back surface, and the surface of the plate-like portion. A protrusion projecting from the center portion toward the side where the valve hole is located, and the valve hole is opened and closed by the surface of the plate-like part being separated from the valve seat, and the valve hole With the movement of the valve body in the closing direction, which is the direction to close By inserting into the hole and reducing the flow path cross-sectional area of the valve hole, the movement of the valve body in the closing direction is assisted, and the plate-like portion is provided inside the valve body. A recess is formed on the back surface and extends in the protrusion, and a guide for guiding movement of the valve body in the opening / closing direction is inserted in the recess.

  According to the above configuration, the valve body can move in the opening and closing direction while being guided by the guide portion. Decreasing the thickness of the plate-like portion leads to reducing the thickness of the valve body itself and reducing the weight of the valve body itself, and the valve body is easily moved. Even if the thickness of the plate-like part is reduced, the inclination of the valve body when the valve body moves can be effectively suppressed or prevented by the guide function of the guide part, and the valve body can be stabilized. It is possible to open and close the valve hole.

  In the springless check valve for the compressor, preferably, the guide portion is disposed so as to overlap an axis that defines a central axis of the valve hole.

  According to the said structure, a refrigerant | coolant can spread radially by the projection part arrange | positioned around a guide part, and a refrigerant | coolant can flow to a forward direction with less pressure loss efficiently.

  In the springless check valve for the compressor, preferably, the guide portion is disposed at a position away from an axis that defines a central axis of the valve hole.

  According to the above configuration, since the valve body is guided at a position away from the axis defining the central axis of the valve hole, the valve body can be reciprocated more stably.

  The springless check valve for the compressor preferably further includes a valve case that accommodates the valve body inside, and the valve case is formed in a cylindrical shape and rises from the outer peripheral portion of the bottom portion. The side wall is connected to the valve seat member.

  According to the above configuration, it is possible to obtain a check valve in which the valve seat member and the valve body are assembled as one unit, which is convenient for design and can improve convenience for layout of various elements. It becomes possible.

  Preferably, in the springless check valve for the compressor, a stopper that restricts movement of the valve body in the valve opening direction by an inner surface of the bottom portion of the valve case coming into contact with the back surface of the plate-like portion. The guide portion is provided so as to stand up from the bottom portion of the valve case.

  According to the above configuration, a check valve in which the valve seat member, the valve body, the guide portion, and the stopper portion are assembled as one unit can be obtained, which is convenient in design and convenient in layout of various elements. Can also be improved.

  In the springless check valve for the compressor, a through hole through which the refrigerant passes is preferably formed in the bottom portion of the valve case.

  According to the above configuration, when the refrigerant flows in the reverse direction, the valve element can receive pressure from the refrigerant that has passed through the through hole, and can efficiently move toward the side where the valve hole is located. .

  In the springless check valve for the compressor, a communication window through which the refrigerant passes is preferably formed on the side wall of the valve case.

  According to the above configuration, the refrigerant can efficiently flow downstream through the valve hole and the communication window.

  According to the present invention, it is possible to obtain a springless check valve for a compressor capable of suppressing the inclination of the valve body when the valve body moves even when the thickness of the valve body is reduced. Is possible.

1 is a cross-sectional view showing a compressor 10 in a first embodiment. It is arrow sectional drawing along the II-II line in FIG. It is arrow sectional drawing along the III-III line in FIG. It is sectional drawing which expands and shows the area | region enclosed by the IV line in FIG. FIG. 2 is a cross-sectional perspective view showing a check valve 40 in the first embodiment. FIG. 3 is a cross-sectional perspective view showing an exploded state of the check valve 40 in the first embodiment. In check valve 40 of Embodiment 1, it is sectional drawing which shows a mode that a refrigerant | coolant is flowing forward. In check valve 40 of Embodiment 1, it is sectional drawing which shows a mode when a refrigerant | coolant begins to flow into a reverse direction. FIG. 3 is a cross-sectional view showing a state where a valve hole 51 is closed by a valve body 60 in the check valve 40 of the first embodiment. It is sectional drawing which shows a mode when the refrigerant | coolant begins to flow in the reverse direction in the non-return valve 40Z of a comparative example. It is sectional drawing which shows non-return valve 40A in Embodiment 2. FIG. It is sectional drawing which shows the non-return valve 40B in Embodiment 3. It is sectional drawing which shows nonreturn valve 40C in Embodiment 4. It is sectional drawing which shows check valve 40D in Embodiment 5. FIG. It is sectional drawing which shows the non-return valve 40E in Embodiment 6. It is a cross-sectional perspective view which shows the non-return valve 40F in Embodiment 7. It is sectional drawing which shows the non-return valve 40G in Embodiment 8. It is sectional drawing which shows the non-return valve 40H in Embodiment 9.

  Hereinafter, embodiments will be described with reference to the drawings. In the description of the embodiments, the same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated.

[Embodiment 1]
(Compressor 10)
FIG. 1 is a cross-sectional view showing a compressor 10 in the first embodiment. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view taken along line III-III in FIG. The compressor 10 is mounted on a vehicle, for example, and used for an air conditioner of the vehicle. Although the compressor 10 is of a vane type, the technical idea relating to the check valve 40 disclosed below can be applied to a compressor of a scroll type, a swash plate type, a roots type, or the like.

  As shown in FIG. 1, the compressor 10 includes a housing 11 and a check valve 40. The housing 11 includes a rear housing 12 and a front housing 13, and forms a suction chamber 20 inside. The rear housing 12 has a peripheral wall 12a (FIGS. 2 and 3). The front housing 13 has a cylinder block 14, and the cylinder block 14 is accommodated in the rear housing 12. A side plate 15 is joined to the cylinder block 14.

  A rotor 18 is provided inside the cylinder block 14. A plurality of grooves 18a are provided on the outer peripheral surface of the rotor 18 (FIGS. 2 and 3), and a plurality of vanes 19 are accommodated inside the plurality of grooves 18a so as to be able to appear and retract. As the rotary shaft 16 rotates, the rotor 18 rotates, and the outer peripheral surface of the rotor 18, the inner wall of the cylinder block 14, a pair of adjacent vanes 19, the front housing 13 (FIG. 1), and the side plate 15 (FIG. 1), the compression chamber 21 is defined.

  A concave portion 14 a is formed on the outer peripheral surface of the cylinder block 14. A suction chamber 20 is formed by the recess 14 a provided in the cylinder block 14 and the inner peripheral surface of the rear housing 12. A suction port 22 provided in the housing 11 (rear housing 12) forms a refrigerant passage through which the refrigerant passes, and can communicate with the suction chamber 20 via a check valve 40.

  The cylinder block 14 is formed with a pair of suction ports 23 (FIG. 2). During the suction stroke, the compression chamber 21 and the suction chamber 20 communicate with each other through the suction port 23. A pair of recesses 14 b (FIGS. 1 and 3) is also provided on the outer peripheral surface of the cylinder block 14. The discharge chamber 30 is defined by the recess 14b and the rear housing 12 (the peripheral wall 12a). In the cylinder block 14, a discharge port 31 (FIG. 3) that connects the compression chamber 21 and the discharge chamber 30 is formed. The refrigerant gas compressed in the compression chamber 21 pushes out the discharge valve 32 and is discharged to the discharge chamber 30 through the discharge port 31.

  A discharge port 34 (FIG. 1) is formed on the peripheral wall 12 a of the rear housing 12. A discharge region 35 (FIG. 1) is defined by the side plate 15 on the rear side of the rear housing 12. An oil separator 36 is provided in the discharge region 35. A communication passage 37 is formed in the side plate 15 and the oil separator 36 (FIGS. 1 and 3). The communication passage 37 allows the discharge chamber 30 and the oil separator 36 to communicate with each other. An oil supply passage 15 d (FIG. 1) is also formed in the side plate 15. The oil supply passage 15d guides the lubricating oil stored at the bottom of the discharge region 35 to the plurality of grooves 18a (vane grooves).

(Check valve 40)
The suction port 22 (FIGS. 1 and 2) is provided so as to penetrate the peripheral wall 12 a of the rear housing 12, and a cylindrical joint portion 24 is connected to the suction port 22. A pipe (not shown) is connected to the joint portion 24, and refrigerant (refrigerant gas) flows into the suction port 22 through this pipe. A check valve 40 (a springless check valve for a compressor) that prevents the refrigerant from flowing back from the suction chamber 20 to the suction port 22 is provided in the suction port 22. FIG. 4 is an enlarged cross-sectional view showing a region surrounded by line IV in FIG. FIG. 5 is a cross-sectional perspective view showing the check valve 40. FIG. 6 is a cross-sectional perspective view showing an exploded state of the check valve 40.

  As shown in FIGS. 4 to 6, the check valve 40 includes a valve seat member 50, a valve body 60, and a valve case 70. The check valve 40 is provided inside the housing 11 (FIG. 1) of the compressor 10, and the refrigerant flows in the forward direction from the suction port 22 toward the suction chamber 20 as described in detail below. Allowing (see FIG. 7), restricting the flow of the refrigerant in the reverse direction, and closing the valve hole 51 by the valve body 60 by the flow of the refrigerant in the reverse direction (see FIG. 9).

(Valve seat member 50)
The valve seat member 50 has a hollow annular shape as a whole and is provided in the suction port 22. The valve seat member 50 is a member provided separately from the member forming the inner wall surface of the suction port 22 (rear housing 12), and is fixed to the inner wall surface of the suction port 22 by press fitting. The valve seat member 50 forms a valve hole 51 through which refrigerant passes. The valve hole 51 has a cylindrical space and has a central axis 51c. The central axis 51 c is parallel to the axial direction of the suction port 22. A recess 51t (FIG. 6) extending in the circumferential direction is formed on the outer side of the valve seat member 50.

  The end face of the valve seat member 50 on the downstream side in the forward direction of the valve hole 51 (in other words, the end face located on the downstream side of the valve hole 51 in the forward direction when the refrigerant is flowing in the forward direction) A valve seat 52 is formed. The valve seat 52 of the present embodiment is formed so as to be located in a plane perpendicular to the central axis 51c. The valve seat 52 is arrange | positioned so that the surface 61a of the valve body 60 mentioned below can contact.

(Valve 60)
The valve body 60 is disposed downstream of the valve seat member 50 in the forward direction (in other words, downstream of the valve seat member 50 in the forward direction when the refrigerant is flowing in the forward direction). The valve body 60 includes a plate-like portion 61 and a protruding portion 62. The plate-like portion 61 and the protruding portion 62 can be manufactured integrally with each other by, for example, resin molding. The plate-like portion 61 has a substantially disc shape, and has a front surface 61 a located on the valve hole 51 side and a back surface 61 b located on the opposite side of the valve hole 51.

  The protruding portion 62 protrudes from the central portion of the surface 61a of the plate-like portion 61 toward the side where the valve hole 51 is located. The valve body 60 opens and closes the valve hole 51 when a portion of the surface 61 a of the plate-like portion 61 located on the outer periphery of the protrusion 62 comes in contact with the valve seat 52. The protrusion 62 is a portion that is disposed at a position closest to the valve hole 51 in the valve body 60 when the refrigerant is flowing in the forward direction (in the state shown in FIG. 7). The protruding portion 62 has a cylindrical shape at a portion protruding from the surface 61a of the plate-like portion 61, and a portion having a disk shape is formed at the tip of the cylindrical portion so as to close the tip opening of the cylindrical portion. Is provided. The portion having the disk shape forms the tip 62u of the protrusion 62.

  A recess 65 is formed in the valve body 60. The recess 65 has a cylindrical space, opens on the back surface 61 b of the plate-like portion 61, and extends in the protrusion 62. That is, one end 65 a (FIG. 6) of the recess 65 is open on the back surface 61 b of the plate-like part 61. The other end 65 b (FIG. 6) of the recess 65 is provided inside the protrusion 62. The recess 65 extends from the position of the one end 65a toward the position of the other end 65b with a length that does not penetrate the protrusion 62. The recessed portion 65 does not penetrate the distal end portion 62u, and the recessed portion 65 is formed in the valve body 60 so that the distal end portion 62u remains at the position on the other end 65b side of the recessed portion 65.

  The valve body 60 in the present embodiment is configured as described above, and is rotationally symmetric with respect to an axis that defines the central axis 51c of the valve hole 51 (a straight line formed when the central axis 51c is extended). have. The rotational symmetry means that 2π / n radians (n is a positive integer and n = 4 in the present embodiment) when a part of the valve body 60 is rotated around an axis that defines the central axis 51c. Means that the same figure is repeated at a rotation angle of.

(Valve case 70)
The valve case 70 has a bottomed cylindrical shape and accommodates the valve body 60 inside. The valve case 70 of the present embodiment has a bottom 71 and a side wall 72. The bottom portion 71 is formed in a substantially disk shape, and the inner surface of the bottom portion 71 constitutes a stopper portion 71s. That is, the stopper portion 71 s is provided at a position opposite to the valve seat member 50 with respect to the plate-like portion 61 of the valve body 60. The stopper portion 71s abuts against the back surface 61b of the plate-like portion 61 to limit the movement of the valve body 60 in the valve opening direction.

  A guide portion 75 is provided on the bottom portion 71 of the valve case 70 so as to rise from the inner surface of the bottom portion 71 toward the side where the valve hole 51 is located. The guide part 75 has a thin cylindrical shape. In a state where the valve case 70 is coupled to the valve seat member 50, the guide portion 75 is disposed so as to overlap an axis that defines the central axis 51c of the valve hole 51 (a straight line formed when the central axis 51c is extended). Is done. The guide portion 75 is inserted into the concave portion 65 of the valve body 60 from the one end 65a (FIG. 6) side.

  The guide part 75 guides the movement of the valve body 60 in the opening / closing direction (the valve opening direction and the valve closing direction). The guide part 75 guides the movement of the valve body 60 in the opening / closing direction by slidingly contacting the inner surface of the valve body 60 forming the recess 65. A gap extending continuously or intermittently in the circumferential direction may be formed between the outer peripheral surface of the guide portion 75 and the inner surface of the concave portion 65 of the valve body 60. In other words, a gap that forms some so-called play may be formed between the outer peripheral surface of the guide portion 75 and the inner surface of the recess 65 of the valve body 60. That is, the guide portion 75 may be configured to always slidably contact the inner surface of the recess 65, or not always slidably contact the inner surface of the recess 65 as long as a desired guide function can be achieved. It may be configured as follows. Due to the presence of the gap, relative movement between the valve body 60 and the valve case 70 in the left-right direction (direction orthogonal to the axial direction) is likely to occur, and thus the sealing performance of the valve body 60 with respect to the valve hole 51 is appropriate The size of the gap may be determined within a range that can be secured.

  A pair of through holes 71h are formed in the bottom 71 (FIG. 6). Each of the pair of through holes 71h penetrates the bottom portion 71 in the thickness direction, and extends in a semicircular arc shape (substantially C shape) along the circumferential direction. A side wall 72 is provided so as to stand up from the outer peripheral portion of the bottom 71. The side wall 72 has a cylindrical shape, and four communication windows 72h through which refrigerant passes when the valve is opened are formed side by side in the circumferential direction (FIG. 6).

  A portion of the side wall 72 positioned between two communication windows 72h adjacent to each other in the circumferential direction forms a columnar portion 72s. In the present embodiment, the side wall 72 includes four columnar portions 72s. A plurality of convex portions 72t (FIG. 6) are provided on the portion of the side wall 72 located on the upper side (valve hole 51 side) of the columnar portion 72s so as to extend in the circumferential direction. The valve case 70 is connected to the valve seat member 50 by fitting the plurality of convex portions 72t into the concave portions 51t of the valve seat member 50. Since the check valve 40 includes the valve case 70, the check valve 40 in which the valve seat member 50, the valve body 60, the stopper portion 71s, and the guide portion 75 are assembled as one unit can be obtained. The above convenience is improved, and the convenience in layout of various elements can be improved.

  As shown in FIG. 4, in the check valve 40, in a state where the back surface 61b of the plate-like portion 61 of the valve body 60 is in contact with the stopper portion 71s, a part of the protrusion 62 of the valve body 60 is a valve hole. 51 is located inside. When all of the protrusions 62 of the valve body 60 are not located inside the valve hole 51 when the back surface 61b of the plate-like part 61 of the valve body 60 is in contact with the stopper portion 71s due to the presence of the part. Compared with, the flow path cross-sectional area of the valve hole 51 in the check valve 40 is narrowed (the flow path cross-sectional area is small). In the present embodiment, in addition, in the state in which the back surface 61b of the plate-like portion 61 is in contact with the stopper portion 71s, the part of the protruding portion 62 that is located inside the valve hole 51 is the valve hole. 51 is arranged so as to overlap the central axis 51c of 51.

(Forward direction)
Referring to FIG. 7, when the refrigerant flows in the forward direction (arrow AR1) with the valve closed, the valve body 60 receives pressure (fluid force) from the refrigerant, so that the valve body 60 It moves in the direction of opening the valve hole 51. The guide part 75 guides the movement of the valve body 60 in the valve opening direction by sliding contact with the inner surface of the valve body 60 forming the recess 65. The valve body 60 can move stably. The front surface 61a of the plate-like portion 61 is disposed at a position away from the valve seat 52, and the back surface 61b of the plate-like portion 61 contacts the stopper portion 71s. As described above, in the state where the valve body 60 is in contact with the stopper portion 71 s, a part of the protruding portion 62 is located inside the valve hole 51.

  Refrigerant from an evaporator (not shown) passes through the valve hole 51 and the four communication windows 72h (FIG. 6) and enters the suction chamber 20. Since the four communication windows 72h are provided in the side wall 72 of the valve case 70, the refrigerant can efficiently enter the suction chamber 20 through the valve hole 51 and the four communication windows 72h (FIG. 6).

  In the present embodiment, the guide portion 75 is disposed so as to overlap with an axis that defines the central axis 51 c of the valve hole 51, and the projection portion 62 is disposed around the guide portion 75. The protrusion 62 is arranged so as to overlap the central axis 51c of the valve hole 51, and the refrigerant can spread radially by the protrusion 62, and the refrigerant can be efficiently introduced into the suction chamber 20 from the suction port 22 with less pressure. You can get in with a loss.

(Reverse direction)
As shown in FIG. 8, at a timing immediately after the operation of the compressor 10 stops, the refrigerant flows in the reverse direction (arrow AR <b> 2). When the refrigerant flows in the reverse direction (arrow AR2) in a state where the back surface 61b of the plate-like portion 61 is in contact with the stopper portion 71s, the valve body 60 receives pressure (fluid force) from the refrigerant. This pressure is negative and acts to move the valve body 60 toward the side where the valve hole 51 is located.

  In the check valve 40, as described above, a part of the protrusion 62 is located inside the valve hole 51 in a state where the valve body 60 is in contact with the stopper portion 71s. The valve hole 51 is partially blocked, and the flow path cross-sectional area of the valve hole 51 is narrowed compared to the case where the entire protrusion 62 is not located inside the valve hole 51 (the flow path is cut off). The area is getting smaller).

  The presence of the part of the protrusion 62 forms a portion where the refrigerant hardly passes inside the valve hole 51, and acts so that a high pressure reducing effect is generated at the portion (position RB). When the refrigerant flows in the reverse direction (arrow AR2), not only does the pressure reducing effect occur at the position RA where the four communication windows 72h are provided, but the flow passage cross-sectional area is reduced due to the presence of the part of the protrusion 62. A high depressurization effect is generated at the position RB inside the valve hole 51.

  When the refrigerant passes through the valve hole 51 whose flow path cross-sectional area is narrowed, the valve body 60 can receive pressure from the refrigerant efficiently, and the valve body 60 is connected to the valve seat member 50 side. A greater force will be applied to move to. The valve body 60 receives such force and starts moving in the closing direction, which is the direction closing the valve hole 51. As the valve body 60 starts moving, the protrusion 62 is inserted further into the valve hole 51, and the flow path cross-sectional area of the valve hole 51 is further reduced, thereby closing the valve body 60. Movement to is assisted.

  In the check valve 40, a pair of through holes 71 h are formed in the bottom portion 71 of the valve case 70. When the refrigerant flows in the reverse direction (arrow AR2), the refrigerant passes through the pair of through holes 71h and applies pressure to the plate-like portion 61 of the valve body 60. The valve body 60 can also receive pressure from the refrigerant that has passed through the pair of through holes 71h, and can move more efficiently toward the side where the valve hole 51 is located.

  As shown in FIG. 9, the valve body 60 moves in the reverse direction (in other words, the downstream side in the reverse direction when the refrigerant is flowing in the reverse direction) by receiving pressure from the refrigerant. The valve body 60 moves in the direction of closing the valve hole 51 while being guided by the guide portion 75, and the surface 61 a of the plate-like portion 61 contacts the valve seat 52. In a state where the surface 61 a of the plate-like portion 61 is in contact with the valve seat 52 of the valve seat member 50, the valve body 60 is held by the differential pressure generated through the plate-like portion 61 of the valve body 60 in contact with the valve seat member 50. Then, the valve hole 51 is closed.

  In the closed state, the pressure in the space on the suction chamber 20 side with respect to the suction port 22 is higher than the pressure in the space on the joint portion 24 side with respect to the suction port 22. Due to this differential pressure, the surface 61 a of the plate-like portion 61 continues to be pressed against the valve seat 52 of the valve seat member 50. The valve hole 51 is closed, and the refrigerant flowing in the reverse direction (arrow AR3) is restricted.

[Comparative example]
FIG. 10 is a cross-sectional view showing a state when the refrigerant starts to flow in the reverse direction in the check valve 40Z of the comparative example. The check valve 40Z of the comparative example is that the protrusion 62 is not provided on the valve body 60 (the valve body 60 is configured only from a portion corresponding to the plate-like portion 61), and the guide portion is provided on the valve case 70. The difference from the check valve 40 in the first embodiment is that 75 is not provided.

  When the refrigerant flows in the reverse direction (arrow AR4) while the valve body 60 is in contact with the stopper portion 71s, the valve body 60 receives pressure (fluid force) from the refrigerant. This pressure is negative and acts to move the valve body 60 toward the side where the valve hole 51 is located.

  In the check valve 40Z, both the front surface and the back surface of the valve body 60 have a flat surface shape, and the refrigerant (arrow AR4) can pass through when the valve body 60 is in contact with the stopper portion 71s. The cross-sectional area of the simple flow path is not reduced compared to the case of the first embodiment, and the flow path is smaller than that of the first embodiment in which a part of the protrusion 62 is located inside the valve hole 51. The road cross-sectional area is large.

  When the refrigerant flows in the reverse direction (arrow AR4), a pressure reducing effect occurs at the position RA where the four communication windows 72h are provided. However, in the case of the check valve 40Z, a sufficient pressure reducing effect does not occur at the position RC inside the valve hole 51 and in the vicinity thereof. Since the refrigerant passes through the flow passage (valve hole 51) whose flow passage cross-sectional area is not narrowed compared to the case of the first embodiment, the valve body 60 is more efficient than the refrigerant in the case of the first embodiment. The pressure cannot be received well, and a large force that moves the valve body 60 toward the valve seat member 50 does not act on the valve body 60.

  In the case of the check valve 40Z, the valve body 60 is further configured only from a portion corresponding to the plate-like portion 61. Decreasing the thickness of the valve body 60 leads to weight reduction of the valve body 60 itself, and the valve body 60 becomes easy to move. However, since the check valve 40Z does not have the guide portion 75, the valve body 60 is likely to be inclined when the valve body 60 moves (see the chain line shown in FIG. 10). However, it may be difficult to open and close the valve hole 51 stably. It is also possible to adopt a configuration in which the inner peripheral surface of the side wall 72 of the valve case 70 is slidably contacted with the outer peripheral surface of the valve body 60 so that the inner peripheral surface of the side wall 72 of the valve case 70 functions as a guide portion. However, reducing the thickness of the valve body 60 leads to a decrease in the surface area of the outer peripheral surface of the valve body 60 and a decrease in the area in which the valve body 60 comes into sliding contact. Thus, it may be difficult to open and close the valve hole 51.

(Operation and effect of the first embodiment)
The check valve 40 according to the first embodiment includes a guide portion 75, and the valve body 60 can move in the valve opening direction and the valve closing direction while being guided by the guide portion 75. Decreasing the thickness of the plate-like portion 61 leads to reducing the thickness of the valve body 60 itself and reducing the weight of the valve body 60 itself, so that the valve body 60 is easily moved. In the case of the check valve 40, even if the thickness of the plate-like portion 61 is reduced, it is effectively suppressed or prevented by the guide function of the guide portion 75 that the valve body 60 tends to be inclined when the valve body 60 moves. The valve body 60 can open and close the valve hole 51 stably.

  In the check valve 40, a recess 65 is further formed inside the valve body 60. The recess 65 has a cylindrical space and extends from the position of one end 65a (FIG. 6) toward the position of the other end 65b so as not to penetrate the protrusion 62. The recess 65 does not penetrate the tip 62u of the protrusion 62, and the recess 65 is formed in the valve body 60 so that the tip 62u remains at a position on the other end 65b side of the recess 65. Yes. If the protrusion 62 of the valve body 60 is formed only from a member having a cylindrical shape, that is, if the other end 65b is open at the tip of the protrusion 62, the protrusion 62 is not closed when the valve is closed. There is a possibility that the refrigerant leaks from the opening formed at the tip through the minute gap between the inner peripheral surface of the protrusion 62 and the outer peripheral surface of the guide portion 75 to the suction chamber 20 side. On the other hand, in the case of the check valve 40, the recess 65 is formed inside the valve body 60 in such a manner that the tip 62u remains at the position on the other end 65b side of the recess 65. Since the tip end 62u side is closed, the refrigerant is effectively prevented from leaking to the suction chamber 20 side when the valve is closed.

  In the check valve 40 of the first embodiment, a protrusion 62 is provided on the valve body 60, and a part of the protrusion 62 is in the valve hole 51 in a state where the valve body 60 is in contact with the stopper portion 71 s. Located inside. When the refrigerant flows in the reverse direction (arrow AR2), the refrigerant passes through the valve hole 51 in which the flow path cross-sectional area is narrowed, so that the valve body 60 can receive pressure from the refrigerant efficiently. Therefore, a greater force is applied to move the valve body 60 toward the valve seat member 50. That is, the check valve 40 can more efficiently utilize the differential pressure generated by the fluid force of the refrigerant that flows backward. The valve body 60 can be easily moved from the open position to the closed position by the pressure of the refrigerant, and the valve hole 51 can be opened and closed stably by the valve body 60 without using a spring.

  A spring that acts in the direction of narrowing the cross-sectional area of the passage through which the refrigerant flows when the valve is opened is not provided in the check valve 40 (a springless check valve for the compressor). As a result, no pressure loss of the refrigerant occurs. Since the spring that biases the valve body 60 in the valve closing direction is not provided (for example, between the valve body 60 and the stopper portion 71s), the check valve 40 can be configured to be lighter and smaller. Moreover, it can also contribute to size reduction of the compressor 10 whole. While being able to ensure the flow volume of a refrigerant | coolant appropriately, it is also possible to ensure the cooling capacity of the compressor 10 appropriately.

  In the check valve 40 of the first embodiment, the valve body 60 is rotationally symmetric with respect to an axis that defines the central axis 51c of the valve hole 51 (a straight line formed when the central axis 51c is extended). have. For example, the protrusion 62 of the valve body 60 may not have a shape that is rotationally symmetric with respect to the axis that defines the central axis 51 c of the valve hole 51. The protruding portion 62 may extend from an arbitrary position in the plate-like portion 61 so as to be parallel to the axis. The same applies to the shape and position of the guide portion 75.

[Embodiment 2]
FIG. 11 is a cross-sectional view showing a check valve 40A in the second embodiment. The check valve 40A is different from the check valve 40 according to the first embodiment in the following points. In the check valve 40 </ b> A, the entire protrusion 62 is not located inside the valve hole 51 in a state where the valve body 60 is in contact with the stopper portion 71 s. The front end 62u of the protrusion 62 is located slightly closer to the stopper 71s than the valve seat 52 is. Also with this configuration, the valve body 60 can move in the opening / closing direction while being guided by the guide portion 75. Even if the thickness of the plate-like portion 61 is reduced, the inclination of the valve body 60 when the valve body 60 moves can be effectively suppressed or prevented by the guide function of the guide portion 75. 60 can open and close the valve hole 51 stably.

  Even when the projecting portion 62 having the configuration is employed, the valve body 60 receives pressure (fluid force) from the refrigerant when the refrigerant flows in the reverse direction. This pressure is negative and acts to move the valve body 60 toward the side where the valve hole 51 is located. The valve body 60 receives such force and starts moving in the closing direction, which is the direction closing the valve hole 51. Due to the presence of the protrusion 62 approaching the valve hole 51, the flow rate of the refrigerant flowing into the valve hole 51 is limited, and the protrusion 62 is inserted into the valve hole 51 after the valve body 60 starts moving. As a result, the movement of the valve body 60 in the closing direction is assisted, as in the case of the above-described first embodiment, by reducing the flow path cross-sectional area of the valve hole 51 due to the presence of the protrusion 62. . Therefore, even in a check valve employing such a configuration, the valve body 60 can efficiently receive pressure from the refrigerant, and the valve body 60 moves the valve body 60 toward the valve seat member 50. A large force will be applied. The check valve adopting such a configuration can also efficiently use the differential pressure generated by the fluid force of the refrigerant flowing backward, and the valve body 60 is opened by the refrigerant pressure. The valve hole 51 can be opened and closed stably by the valve body 60 without using a spring.

[Embodiment 3]
FIG. 12 is a cross-sectional view showing a check valve 40B in the third embodiment. The check valve 40B is different from the check valve 40 in the first embodiment in that the protrusion 62 has a small diameter portion 62a and a large diameter portion 62b.

  The small diameter part 62 a protrudes from the surface 61 a of the plate-like part 61. The large diameter portion 62b is provided on the opposite side of the plate-like portion 61 with respect to the surface 61a and has a conical shape. The large diameter portion 62b is formed with a portion having a longer circumference than the small diameter portion 62a. The said part is comprised by the outer periphery of the cone-shaped bottom part, and is formed in the position near the small diameter part 62a among the large diameter parts 62b. A pressure receiving surface 62s is formed between the portion and the small diameter portion 62a.

  When the refrigerant flows in the reverse direction, the valve body 60 can efficiently receive pressure from the refrigerant due to the presence of the pressure receiving surface 62s. Further, since the conical portion is provided at the tip of the protrusion 62, the presence of the protrusion 62 hardly inhibits the flow of the refrigerant when the valve is opened, and the refrigerant flows from the suction port 22 into the suction chamber 20. It is possible to enter with less pressure loss.

[Embodiment 4]
FIG. 13 is a cross-sectional view showing a check valve 40C in the fourth embodiment. In each of the embodiments described above, the stopper portion 71s and the guide portion 75 are provided in the valve case 70 of the check valve. It is not essential that the stopper portion 71s and / or the guide portion 75 is provided in the valve case 70.

  For example, in the case of a check valve 40C that does not include a valve case, a bulging portion 14c is provided on the surface of a recess 14a provided on the outer peripheral surface of the cylinder block 14. The surface of the bulging portion 14c constitutes a stopper portion 14s. A guide portion 14d having a function similar to that of the guide portion 75 rises from the stopper portion 14s. Also with this configuration, it is possible to obtain substantially the same operations and effects as the above-described embodiments.

  In a state where the plate-like portion 61 is in contact with the stopper portion 14 s, the surface (the stopper portion 14 s) of the bulging portion 14 c is placed on the plate-like portion 61 so that the outer peripheral portion of the back surface 61 b of the plate-like portion 61 is exposed. It may be configured to be slightly smaller than the size of the back surface 61b. The valve body 60 can efficiently receive pressure from the refrigerant, and a greater force acts on the valve body 60 to move the valve body 60 toward the valve seat member 50.

[Embodiment 5]
FIG. 14 is a cross-sectional view showing a check valve 40D in the fifth embodiment. In the check valve 40D, the guide portion 75 has a cylindrical shape as a whole, and the concave portion 65 also has a cylindrical space as a whole. A hanging portion 66 is provided at the center of the tip end portion 62 u of the protruding portion 62. The hanging portion 66 extends in a rod shape from the center of the tip end portion 62 u of the protruding portion 62 toward the bottom portion 71 side. A hanging portion 66 having a columnar shape is inserted inside a guide portion 75 having a cylindrical shape.

  In the present embodiment, the guide portion 75 is disposed at a position away from the axis that defines the central axis 51 c of the valve hole 51. The movement of the valve body 60 is guided by the sliding contact between the inner peripheral surface of the cylindrical portion of the guide portion 75 and the outer peripheral surface of the hanging portion 66. Since the valve body 60 is guided at a position away from the axis defining the central axis 51c, the valve body 60 can be reciprocated more stably.

[Embodiment 6]
FIG. 15 is a cross-sectional view showing a check valve 40E in the sixth embodiment. In the check valve 40E, a plurality of guide portions 75m and 75n are provided in the valve case 70, and a plurality of recesses 65m and 65n are provided in the valve body 60. Each of the guide portions 75m and 75n has a cylindrical shape, and each of the recesses 65m and 65n has a cylindrical space. The guide portions 75m and 75n are inserted into the recesses 65m and 65n, respectively.

  Also in the present embodiment, the guide portions 75m and 75n are arranged at positions away from the axis defining the central axis 51c of the valve hole 51. Also with this configuration, it is possible to obtain substantially the same operations and effects as the above-described embodiments. In the case where the check valve includes a plurality of guide portions and a plurality of recesses, two of these configurations may be provided, for example, at 180 ° intervals along the circumferential direction, or along the circumferential direction. Four may be provided at intervals of 90 °.

[Embodiment 7]
FIG. 16 is a cross-sectional perspective view showing a check valve 40F in the seventh embodiment. The check valve 40F is different from the check valve 40 in the first embodiment in that a hollow space is provided inside the guide portion 75. By increasing the diameter of the guide portion 75 as compared with the case of the first embodiment, the area of the portion where the guide portion 75 and the valve body 60 are in sliding contact with each other is increased, and the guide function by the guide portion 75 is improved. Even when such a configuration is adopted, it is possible to reduce the weight of the valve case 70 by providing a hollow space inside the guide portion 75.

  The guide portion 75 shown in FIG. 16 has a cylindrical portion and a portion having a disk shape provided at the distal end of the cylindrical portion so as to close the distal end opening located on the distal end portion 62u side with respect to the cylindrical portion. Yes. Not limited to such a configuration, when the guide portion 75 has a cylindrical shape, the tip end side may be formed to open (see the guide portion 75 shown in FIG. 14). . Also with these configurations, it is possible to obtain substantially the same operations and effects as the above-described embodiments.

[Embodiment 8]
FIG. 17 is a cross-sectional view showing a check valve 40G in the eighth embodiment. In each of the above-described embodiments, the depth of the concave portion 65 (the length of the concave portion 65 in the axial direction) and the height of the guide portion 75 (the length of the guide portion 75 in the axial direction) are substantially the same. Like the check valve 40G shown in FIG. 17, the depth value of the recess 65 may be smaller than the height value of the guide portion 75.

  In this configuration, the inner surface 71t of the bottom portion 71 of the valve case 70 does not constitute a stopper portion, but instead, the tip of the guide portion 75 functions as a stopper 75s. Also with this configuration, the same operations and effects as the configurations described in the above embodiments can be obtained.

[Embodiment 9]
FIG. 18 is a cross-sectional view showing a check valve 40H according to the ninth embodiment. Like the check valve 40H shown in FIG. 18, the depth value of the recess 65 may be larger than the height value of the guide portion 75.

  In this configuration, the distal end of the guide portion 75 does not contact the distal end portion 62 u of the protruding portion 62. In a state where the back surface 61b of the plate-like portion 61 of the valve body 60 is in contact with the stopper portion 71s, a gap S is formed between the tip end of the guide portion 75 and the tip end portion 62u of the protrusion 62. Also with this configuration, the same operations and effects as the configurations described in the above embodiments can be obtained.

[Other embodiments]
In each of the above-described embodiments, the communication window 72h through which the refrigerant passes when the valve is opened is provided on the side wall 72 of the valve case 70. The configuration is not limited to this, and one or more communication windows 72h may be provided on the bottom 71 of the valve case 70.

  In each of the above-described embodiments, the through hole 71 h is formed in the bottom 71 of the valve case 70. The formation of the through hole 71h in the bottom 71 is not an essential configuration, and the protrusion is provided when the valve body 60 is provided with the protrusion 62 or when the valve body 60 is in contact with the stopper portion 71s. By adopting a configuration in which a part of 62 is positioned inside the valve hole 51, the valve body 60 is controlled by a negative pressure applied to the valve body 60 when the refrigerant flows in the reverse direction. It is possible to move toward the side where the hole 51 is located.

  Although the embodiment has been described above, the above disclosure is illustrative in all respects and is not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  10 compressor, 11 housing, 12 rear housing, 12a peripheral wall, 13 front housing, 14 cylinder block, 14a, 14b, 51t, 65, 65m, 65n recess, 14c bulge, 14d, 75, 75m, 75n guide, 14 s, 71 s, 75 s Stopper portion, 15 side plate, 15 d Oil supply passage, 16 rotating shaft, 18 rotor, 18 a groove, 19 vane, 20 suction chamber, 21 compression chamber, 22 suction port, 23 suction port, 24 joint portion, 30 discharge chamber, 31 discharge port, 32 discharge valve, 34 discharge port, 35 discharge area, 36 oil separator, 37 communication path, 40, 40A, 40B, 40C, 40D, 40E, 40F, 40G, 40H, 40Z Valve, 50 Valve seat member, 51 Valve hole, 51c Center shaft, 52 Valve seat, 6 Valve body, 61 plate-like portion, 61a surface, 61b back surface, 62 protrusion, 62a small diameter portion, 62b large diameter portion, 62s pressure receiving surface, 62u tip portion, 65a one end, 65b other end, 66 hanging portion, 70 valve case, 71 bottom part, 71h through-hole, 71t inner surface, 72 side wall, 72h communication window, 72s columnar part, 72t convex part, S gap.

Claims (7)

A springless check for a compressor that allows the refrigerant to flow in the forward direction, restricts the refrigerant from flowing in the reverse direction, and closes the valve hole with the valve body by the flow of the refrigerant in the reverse direction. A valve,
A valve seat member having the valve hole through which the refrigerant passes, and a valve seat formed on the downstream side of the valve hole in the forward direction;
The valve body disposed on the downstream side of the valve seat member in the forward direction,
The valve body includes a plate-shaped portion having a front surface and a back surface, and a projection protruding from a central portion of the surface of the plate-shaped portion toward the side where the valve hole is located, The surface of the part opens and closes the valve hole by being separated from the valve seat,
With the movement of the valve body in the closing direction, which is the direction to close the valve hole, the protrusion is inserted into the valve hole and the flow passage cross-sectional area of the valve hole is reduced, The movement in the closing direction is assisted,
In the inside of the valve body, a recess is formed that opens on the back surface of the plate-like portion and extends in the protrusion,
A guide portion that guides the movement of the valve body in the opening and closing direction is inserted into the recess.
Springless check valve for compressor. The guide portion is disposed so as to overlap an axis that defines a central axis of the valve hole.
A springless check valve for a compressor according to claim 1. The guide portion is disposed at a position away from an axis that defines the central axis of the valve hole.
A springless check valve for a compressor according to claim 1. A valve case for accommodating the valve body inside;
The valve case has a bottom portion and a side wall formed in a cylindrical shape so as to stand up from an outer peripheral portion of the bottom portion, and the side wall is coupled to the valve seat member.
A springless check valve for a compressor according to any one of claims 1 to 3. The inner surface of the bottom portion of the valve case constitutes a stopper portion that restricts movement of the valve body in the valve opening direction by contacting the back surface of the plate-like portion,
The guide portion is provided to stand up from the bottom portion of the valve case,
A non-spring check valve for a compressor according to claim 4. A through hole through which the refrigerant passes is formed at the bottom of the valve case,
A springless check valve for a compressor according to claim 4 or 5. A communication window through which the refrigerant passes is formed on the side wall of the valve case.
A non-spring check valve for a compressor according to any one of claims 4 to 6.

Images