JP2020034129A - Compressor - Google Patents

Abstract

To provide a compressor capable of preventing induction of discharge pulsation due to self-excited vibration of a vale body to prevent generation of noise in a check valve arranged on a discharge passage.SOLUTION: A compressor is equipped with a check valve 50 on a discharge passage 40, wherein the check valve comprises: a cylindrical case 51 in which a bottom 51a is provided integrally or separately; a valve hole 58 formed in the bottom 51a; a valve body 52 movable in the case along the depth direction of the case 51 and opening and closing the valve hole 58; and a spring 53 that energizes the valve body 52 toward the bottom 51a, wherein a flow passage (flow passage part 52d) for working fluid formed between the valve body 52 of the check valve 50 and the inner peripheral surface of the case 51 is formed so as to be unevenly distributed around the axial core of the valve body 52.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a compressor used in a refrigeration cycle, and more particularly, to a compressor provided with a check valve on a discharge passage for sending compressed working fluid to the outside.

  In the compressor used in the refrigeration cycle, in order to prevent the backflow of the working fluid when the operation is stopped, and in the case of the variable capacity swash plate type compressor, in order to improve the startability from the minimum capacity operation, In the case of a clutchless compressor, it is known to provide a check valve on a discharge passage in the compressor in order to prevent the outflow of working fluid during idling operation.

For example, Patent Document 1 (WO2002-061280) discloses a compressor provided with a check valve near a discharge port of a compressor in a discharge passage of a variable displacement swash plate type clutchless compressor.
The check valve includes a bottomed cylindrical case, a valve body slidable in the case along a depth direction of the case, and opening and closing a valve hole formed in a bottom portion; And a spring for urging the case toward the bottom of the case. Therefore, when the compressor is stopped or when the compressor is operating at the minimum capacity, when the pressure difference between the upstream side and the downstream side of the valve body is not large enough to overcome the biasing force of the spring, The valve body is pressed against the bottom of the case so as to close the valve hole. On the other hand, if the compressor is operated with a predetermined displacement or more and the pressure difference between the upstream side and the downstream side of the valve body overcomes the urging force of the spring, the valve body is pushed up to open the valve hole. Then, the working fluid flows downstream between the valve body and the case, and is discharged from the discharge port of the compressor to the refrigeration cycle.

International Publication WO02 / 061280

In the check valve having the above-described configuration, a predetermined clearance is secured between the maximum diameter portion of the valve body and the inner peripheral surface of the case so that the valve body can slide in the case. For this reason, when the working fluid flows around the periphery of the valve body, the refrigerant flowing around the valve body may cause self-excited vibration of the valve body to induce discharge pulsation.
That is, if the refrigerant flows completely and uniformly around the valve body, no vibration occurs. However, if the flow around the valve body is slightly deviated, the valve body is drawn to the side where more refrigerant flows. Then, the clearance on the opposite side increases, the flow of the refrigerant to that portion increases, and the valve element is pulled back. Since the variation of such a portion through which a large amount of refrigerant flows is repeated in a short cycle, the valve body causes self-excited vibration in the case, thereby inducing a discharge pulsation to cause a problem that noise is generated.

  The present invention has been made in view of the above circumstances, and in a check valve disposed on a discharge passage, to prevent induction of discharge pulsation caused by self-excited vibration of a valve body, and to reduce generation of noise. The main task is to provide a compressor that can operate.

  In order to achieve the above object, in the compressor according to the present invention, a check valve is provided on a discharge passage that sends out the compressed working fluid to the outside, and the check valve has a bottom integrally or separately. A provided cylindrical case, a valve hole formed in the bottom portion, a valve body movable in the case along a depth direction of the case, and opening and closing the valve hole; and the valve body. A spring for urging the valve body toward the bottom portion, wherein a flow path of the working fluid formed between the valve body and an inner peripheral surface of the case is provided at an axial center of the valve body. Is formed so as to be unevenly distributed.

  Therefore, since the flow path formed between the valve body and the inner peripheral surface of the case is formed so as to be unevenly distributed around the axis of the valve body, it is intended for a region where a large amount of working fluid flows around the valve body. The valve body can be always drawn to the side where the working fluid flows intentionally much. Therefore, induction of self-excited vibration of the valve body is suppressed.

  Here, various configurations can be considered as a configuration in which the flow path formed between the valve body and the inner peripheral surface of the case is unevenly distributed around the axis of the valve body. Is a valve head that opens and closes a valve hole, a body formed subsequent to the valve head, and a recess formed on the back surface, and a protrusion protruding from the outer surface of the body to form an inner surface of the case. In the case of having a slidable guide blade portion, the flow channel is formed between adjacent guide blade portions around the body portion, and the circumferential width of the guide blade portion is made different to form the flow channel. It may be formed so as to be unevenly distributed around the axis of the valve body.

  The check valve may further include a stopper having a bottom integrally formed with the case, a stopper fixed to an open end of the case and restricting movement of the valve body, wherein the spring is disposed between the valve body and the stopper. The bottom is formed by a bottom member fitted to the case, and a stopper for restricting the movement of the valve body is formed integrally on the side opposite to the side where the bottom member of the case is fitted. The spring may be mounted between the valve body and the stopper.

Further, in order to effectively suppress the self-excited vibration of the valve body, the discharge passage is provided with the working fluid flowing out of the check valve being offset from the axis of the valve body immediately after the check valve. A drift forming means for flowing may be further provided.
According to such a configuration, since the flow of the working fluid immediately after the check valve flows by one side from the axis of the case by the drift forming means, the periphery of the valve body is adjusted in accordance with the flow of the working fluid immediately after the check valve. Deviation also occurs in the flowing working fluid. Due to the bias of the working fluid flowing around the valve body, the flow path formed unevenly around the valve body is directed to the side where the working fluid flows unevenly, and the working fluid flows through the unevenly distributed flow path. Together with this, the force for pulling the valve body toward the inner peripheral surface of the case toward the side where the working fluid immediately after the check valve is biased further increases. For this reason, self-excited vibration of the valve body can be more effectively suppressed.

  The above-described configuration includes a shaft that is rotatably supported by the housing through the crank chamber, and a swash plate that rotates in synchronization with the rotation of the shaft and is provided to be tiltable with respect to the shaft. A piston that is moored at the periphery of the swash plate and reciprocates in a cylinder bore formed in the housing with the rotation of the swash plate, and a suction chamber selectively communicates with the cylinder bore by reciprocation of the piston. This is particularly effective in a variable displacement swash plate type compressor having a discharge chamber and controlling the displacement by changing the inclination angle of the swash plate.

  As described above, according to the present invention, the flow path formed between the valve body and the inner peripheral surface of the case is formed unevenly around the axis of the valve body. It is possible to intentionally form a region around which a large amount of working fluid flows, and it is possible to always draw the valve body to a side where a large amount of working fluid is intentionally flowing. Therefore, induction of self-excited vibration of the valve body is suppressed, and it is possible to provide a compressor capable of preventing induction of discharge pulsation due to self-excited vibration and reducing generation of noise. .

FIG. 1 is a sectional view showing a variable displacement clutchless compressor according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view showing a portion of the compressor according to the embodiment of the present invention where the check valve is provided. 3A is an enlarged sectional view of the check valve shown in FIG. 2, and FIG. 3B is an exploded perspective view of the check valve shown in FIG. 4A and 4B are views showing a valve body of a check valve, in which FIG. 4A is a perspective view, FIG. 4B is a plan view, FIG. 4C is a bottom view, and FIG. It is sectional drawing cut | disconnected by the A line. 5A and 5B are cross-sectional views of the check valve. FIG. 5A illustrates a case where the valve body is in a closed state, and FIG. 5B illustrates a case where the valve body is in an open state. FIG. 6 is a cross-sectional view illustrating another configuration example of the check valve. FIG. 7 is an enlarged cross-sectional view showing a modification of the portion of the compressor according to the embodiment of the present invention where the check valve is provided. FIG. 8 is a cross-sectional view illustrating the flow of the refrigerant in the configuration shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a variable displacement clutchless compressor as an example of the compressor. The compressor includes a cylinder block 1, a rear head 3 mounted on a rear side (right side in the figure) of the cylinder block 1 via a valve plate 2, and a front side (left side in the figure) of the cylinder block 1. And a front head 5 which is assembled so as to be closed so as to define a crank chamber 4. The front head 5, the cylinder block 1, the valve plate 2, and the rear head 3 are fastened by fastening bolts. 6 are fastened in the axial direction to form a compressor housing.

  A shaft 7, one end of which protrudes from the front head 5, passes through the crank chamber 4 defined by the front head 5 and the cylinder block 1. A portion of the shaft 7 protruding from the front head 5 is connected to a drive pulley 10 rotatably fitted to a boss portion 5a of the front head 5 via a relay member 9 fixed by bolts 8 so that the vehicle can be driven. Rotational power is transmitted from the engine via a drive belt (not shown). One end of the shaft 7 is hermetically sealed with a front head 5 via a seal member 11 provided between the shaft 7 and the shaft 7 and is rotatably supported by a radial bearing 12. The other end of the shaft 7 is rotatably supported by a radial bearing 14 housed in the recess 13 of the cylinder block 1.

  The cylinder block 1 is formed with the concave portion 13 in which the radial bearing 14 is housed, and a plurality of cylinder bores 15 arranged at equal intervals on a circumference around the concave portion 13. , A single-headed piston 16 is inserted so as to be able to slide back and forth.

  A thrust flange 17 that rotates integrally with the shaft 7 in the crank chamber 4 is fixed to the shaft 7. The thrust flange 17 is rotatably supported on the inner surface of the front head 5 via a thrust bearing 18, and a swash plate 20 is connected to the thrust flange 17 via a link member 19.

  The swash plate 20 is provided so as to be tiltable around a hinge ball 21 slidably provided on the shaft 7, and rotates integrally with the rotation of the thrust flange 17 via a link member 19. It is supposed to. An engaging portion 16a of the single-headed piston 16 is moored to the swash plate 20 at a peripheral portion thereof via a pair of shoes 22.

  Therefore, when the shaft 7 rotates, the swash plate 20 rotates with the rotation of the shaft 7, and the rotational motion of the swash plate 20 is converted into the reciprocating linear motion of the single-headed piston 16 via the shoe 22, and the single-headed piston 16 The volume of the compression chamber 23 formed between the pressure chamber 23 and the valve plate 2 is changed.

  The valve plate 2 is formed with a suction hole 31 and a discharge hole 32 corresponding to each cylinder bore 15, and the rear head 3 has a suction chamber 33 containing a working fluid to be supplied to the compression chamber 23, A discharge chamber 34 for containing the working fluid discharged from the compression chamber 23 is defined. The suction chamber 33 is formed at a central portion of the rear head 3, communicates with a suction port (not shown) that communicates with the outlet side of the evaporator, and via a suction hole 31 of the valve plate 2 that is opened and closed by a suction valve 35. 23 can be communicated. The discharge chamber 34 is formed around the suction chamber 33, and can communicate with the compression chamber 23 via the discharge hole 32 of the valve plate 2 opened and closed by the discharge valve 36. In addition, it communicates with a muffler chamber 37 formed in the peripheral portion of the cylinder block 1 through the passages 2a and 1a formed in the cylinder block 1.

  As shown in FIG. 2, the muffler chamber 37 is closed by a cover 38 attached to the cylinder block 1. The cover 38 has a discharge port 38a and a valve housing hole 38b. The above-described passages 1a and 2a, the muffler chamber 37, the valve accommodating hole 38b, and the discharge port 38a constitute a discharge passage 40 for sending the refrigerant gas discharged from the compression chamber 23 to the discharge chamber 34 to the outside of the compressor. A check valve 50 is housed in the valve housing hole 38b of the discharge passage 40.

  The inclination angle of the swash plate 20 with respect to the plane perpendicular to the shaft 7 is determined by the moment acting on the swash plate 20. The swash plate has a force based on a pressure difference acting on the front and back surfaces of the respective pistons 16 via the shoes 22 (that is, a pressure difference between the compression chamber 23 and the crank chamber 4), and a piston stroke via the hinge ball 21. Is exerted by a pressing force of the destroke spring 28 which urges in a direction to reduce the pressure. The inclination of the swash plate 20 is set where the sum of the moments based on these forces balances, whereby the piston stroke is determined and the discharge capacity is determined.

  As a result, when the pressure in the crank chamber 4 decreases, the differential pressure between the compression chamber 23 and the crank chamber 4 increases, and a moment acts in a direction to increase the inclination angle of the swash plate 20, and the stroke amount of the piston 16 increases. As a result, the discharge capacity increases. Conversely, if the pressure in the crank chamber 4 increases, the differential pressure between the compression chamber 23 and the crank chamber 4 decreases, and a moment acts in a direction to decrease the inclination angle of the swash plate 20, and the stroke amount of the piston 16 decreases. As a result, the discharge capacity is reduced.

  In addition, an air supply passage 41 that connects the discharge chamber 34 and the crank chamber 4 is formed by passages 1b, 2b, 3b formed over the cylinder block 1, the valve plate 2, and the rear head 3, and the cylinder block 1 A bleed passage 42 is formed between the crank chamber 4 and the suction chamber 33 through the passages 1c and 2c formed in the valve plate 2, the passage 7c formed in the shaft 7, the gap between the radial bearings 14, and the like. . A pressure control valve 45 is provided on the air supply passage 41, and the pressure in the crank chamber 4 is controlled by adjusting the flow rate of the refrigerant flowing from the discharge chamber 34 into the crank chamber 4 by the pressure control valve 45. I have.

  Here, the pressure control valve 45 is inserted into a mounting hole 43 formed in the rear head 3 and has a valve portion 45a, a solenoid 45b, and a bellows 45c. The bellows 45c extends when the suction pressure decreases, and moves the valve portion 45a in a direction to open the air supply passage 41. The solenoid 45b biases the valve portion 45a in a direction to close the air supply passage 41 when a current supplied from a control unit (not shown) increases. The opening degree or opening time of the air supply passage 41 is adjusted by controlling the amount of current supplied from the outside, thereby controlling the crank chamber pressure so that the suction pressure becomes a target value, and stopping the power supply (off). Control such as fully opening the air supply passage 41 and increasing the crank chamber pressure to minimize the discharge capacity is performed.

  Therefore, in a state where the power supply is stopped, the compression chamber 23, the discharge hole 32, the discharge chamber 34, the air supply passage 41, the crank chamber 4, the bleed passage 42, and the suction chamber 33 form an internal circulation path in the compressor. With this internal circulation path, when the inclination angle of the swash plate 20 is at or near the minimum, the refrigerant gas is circulated in the compressor to lubricate and cool the sliding portion inside the compressor. In order to secure such internal circulation of the refrigerant, the check valve 50 is provided in front of the discharge port 38a of the discharge passage 40 to prevent the refrigerant inside the compressor from flowing out.

  The check valve 50 is attached to the cover member 38 so that a valve hole 58 described later faces the muffler chamber 37. In this example, the check valve 50 is provided in the muffler chamber 37 separated from the passages 1a and 2a communicating with the discharge chamber 34. It is provided at a position facing the end.

  As shown in FIG. 3, the check valve 50 housed in the valve housing hole 38b of the discharge passage 40 has a bottomed cylindrical case 51, a valve body 52 housed in this case, A coil-shaped spring 53 for urging the valve element 52, a stopper 54 for restricting the movement of the valve element, and a partition member which is slidably fitted to the valve element 52 and forms a damper chamber 55 together with the valve element 52. 56.

  The case 51 extends from the bottom 51a, the overlap 51b formed following the bottom 51a, the transition 51c formed following the overlap 51b, and the transition 51c. And a cylindrical portion 51d. The bottom portion 51a has a seat surface 57 with which the distal end of the valve body contacts, and a valve hole 58 formed at the center of the seat surface 57. The overlap portion 51b is provided substantially upright with respect to the bottom portion 51a to enable a fitting state of a predetermined length in the depth direction between the distal end portion of the valve body 52 and the case 51.

The transition portion 51 c is formed so as to widen as it moves away from the seat surface 57, and has a tapered surface 59 that narrows the flow of the refrigerant gas between the transition portion 51 c and the distal end portion of the valve body 52. The cylindrical portion 51d extends in the axial direction of the case from the portion where the diameter of the transition portion 51c is widest so as to allow the valve body 52 to move along the depth direction (axial direction) of the case 51. Has become.
A locking recess 60 for locking a stopper 54 described later is formed in an annular shape around the entire inner wall near the open end of the case.

  On the other hand, the valve body 52 is housed in the case 51 and is slidable in the depth direction (axial direction) of the case 51. As shown in FIG. 4, the valve body 52 has a valve head 52 a formed at the distal end thereof and a recess 61 which is formed following the valve head and has a recess 61 for accommodating the spring 53 on the back surface. And a guide blade portion 52c (52c1, 52c2, 52c3) protruding from the outer peripheral surface of the body portion 52b. The valve head 52a has an axially protruding projection 52a1 formed at the center thereof, and a step 52a2 formed therearound. The convex portion 52a1 has a seat surface 62 that can contact the seat surface 57 of the case 51, and opens and closes the valve hole 58 by contacting or separating from the seat surface 57 of the case 51. . A plurality of guide blades 52c (52c1, 52c2, 52c3) are provided at intervals on the outer peripheral surface of the body, and in this example, extend from the opening end of the body to the vicinity of the bottom along the axis of the valve body. The valve body 52 is smoothly guided in the axial direction of the case 51 by sliding the inner peripheral surface of the cylindrical portion 51d of the case 51 in the axial direction. Further, between the adjacent guide blade portions, a flow path portion 52d is provided for flowing the refrigerant gas flowing into the case 51 from the valve hole 58 to the downstream side of the valve body 52.

In this example, adjacent guide blades are provided at intervals of approximately 90 degrees. Two of the guide blades 52c1 and 52c2 have a circumferential width substantially equal to the amount of protrusion from the body, and the other guide blade 52c3 has a circumferential width of approximately 90 at the central angle. (A portion formed diagonally with respect to the guide blade portion 52c1 to a portion located diagonally with respect to the guide blade portion 52c2).
Therefore, the flow path 52d (the flow path of the working fluid formed between the valve body and the inner peripheral surface of the case) in which the working fluid passes beside the valve body in the case becomes three places in the circumferential direction. And are arranged eccentrically around the axis of the valve element.

  In this example, the stopper 54 is formed by forming a thin plate-like member made of spring steel or the like into a chrysanthemum seat shape, and includes a disc-shaped seat surface portion 54b having a through hole 54a formed in the center and the seat surface portion 54b. A plurality of flexible claw portions 54c (six provided at 60-degree intervals in this example) which are radially extended at equal intervals and bent in the same direction (opposite to the valve element) and bent. It is configured to have. The stopper 54 is pushed into the release end of the case 51 from the side of the seat surface portion 54b to elastically deform the claw 54c, and the tip of the claw 54c is formed in the engagement recess formed near the release end of the inner wall of the case 51. It is locked so as to be hooked on the case 60 and fixed to the case 51. Therefore, in a state where the stopper 54 is fixed to the case 51, a communication portion 54 d that connects the front and rear of the stopper 54 is formed by a gap between the adjacent claw portions 54 c, and the valve body 52 and the inner peripheral surface of the case 51 are connected to each other. In the meantime, when the valve body 52 is open (the valve head 52a of the valve body 52 is lifted so as to be disengaged from the overlap portion 51b), the discharge is performed from the valve hole 58 of the case 51 to the communication portion 54d of the stopper 54. A gas passage 65 through which gas flows inside the case is formed.

  The partition member 56 is formed in a cylindrical shape with a bottom, has an inner diameter larger than the diameter of the spring 53, and has an axial dimension substantially equal to the axial dimension of the concave portion 61 formed in the valve body 52. It is formed equal or shorter. The outer diameter of the partition member 56 is formed slightly smaller than the inner diameter of the concave portion 61 of the valve body 52. The damper chamber 55 is slidably fitted in the concave member 61 of the valve body 52. Are formed. A convex portion 56b swelling outward in the axial direction is formed on the bottom portion 56a of the partition member 56. The convex portion 56b is loosely fitted into the through hole 54a of the stopper 54, and the bottom portion 56a is attached to the seat surface portion 54b of the stopper 54. Is in contact with

  The spring 53 is housed in the damper chamber 55 in a state of being compressed in the axial direction, and is elastically mounted between the valve head 52a of the valve body 52 and the bottom 56a of the partition member 56, It is adjusted so that the convex portion 52a1 of the valve body 52 is pressed against the seat surface 57 of the case 51 with a predetermined set load.

In the above configuration, when the valve is closed, as shown in FIG. 5A, the seat surface 62 of the convex portion 52a1 of the valve body 52 comes into contact with the seat surface 57 of the case 51 to close the valve hole 58. The pressure in the muffler chamber 37 is applied only to the portion inside the convex portion 52a1.
Since the pressure on the external cycle side presses the valve body 52 in the closing direction together with the spring load of the spring 53, when the pressure in the muffler chamber 37 becomes higher than this pressing force, the check valve 50 is opened.

  Immediately after the valve is opened, the valve body 52 separates from the seat surface 57 and the valve hole 58 is in an open state, but the distal end portion (valve head 52a) of the valve body 52 is separated from the overlap portion 51b. Therefore, the refrigerant flowing from the valve hole 58 only flows to the discharge port side through the clearance between the valve body 52 and the case 51 in the overlap portion 51b, and the check valve 50 is not substantially opened. It is in. In this state, the pressure on the upstream side (the pressure in the muffler chamber 37) acts on the convex portion 52a1 and the stepped portion 52a2, and the area on which the pressure on the upstream side acts increases. The valve body 52 moves in the opening direction by overcoming the spring load.

  FIG. 5B shows an open state, in which the distal end of the valve body 52 is disengaged from the overlap portion 51 b, and the refrigerant gas in the muffler chamber 37 is directed to the external cycle side via the gas passage 65 of the check valve 50. Discharged. Once the check valve 50 transitions to the open state, the convex part 52a1 and the step part 52a2 of the valve body 52 receive the upstream pressure, so that the open state is maintained even if the flow rate of the refrigerant gas passing through the check valve decreases. Can be maintained.

At this time, the working fluid that has flowed into the case via the valve hole 58 mainly flows through the flow path 52d of the valve element 52, but the flow path 52d is unevenly distributed around the axis of the valve element 52. Therefore, the working fluid flows around the axis of the valve body 52 in a one-sided manner. For this reason, the valve element 52 is drawn toward the side where the flow path portion 52d is formed. The working fluid flowing through the flow path 52d does not increase more than the working fluid flowing through the flow path 52d, so that the state in which the working fluid flows through the unevenly distributed flow path 52 is maintained.
For this reason, the valve element 52 is prevented from generating self-excited vibration, pressure pulsation due to self-excited vibration is suppressed, and the generation of noise can be reduced.

  In particular, in the above-described example, the check valve 50 is provided in the cover 38 so as to face a region away from the passages 1 a and 2 a communicating with the discharge chamber 34 of the muffler chamber 37. The working fluid flows into the check valve 50 after flowing through the muffler chamber 37 to the end, and the working fluid is urged in a direction away from the passages 1a and 2a. As a result, the valve element 52 in the case rotates in accordance with the flow of the refrigerant, and the unevenly distributed flow path portion 52d moves away from the side (paths 1a and 2a) into which the working fluid flows into the muffler chamber 37. Stabilizes when pointed. For this reason, a force to move the valve body 51 in a direction away from the passages 1a and 2a continues to act.

In the above-described configuration, since the damper chamber 55 is formed between the valve body 52 and the stopper 54, even if there is a pressure pulsation or sudden pressure fluctuation, the valve body 52 suddenly moves. Can be alleviated.
In the above-described configuration, since the spring 53 is disposed in the damper chamber 55, it is not necessary to dispose the spring 53 in the gas passage 65 formed between the case 51 and the valve body 52. It is also possible to avoid the disadvantage that the passage resistance increases.

In the configuration of the check valve 50 described above, the case 51 in which the bottom portion 51a is integrated is used, and the stopper 54 is fitted to the case 51. However, the configuration of the check valve 50 may use various forms. It is possible.
For example, as shown in FIG. 6, a bottom member 70 in which an overlap portion 51b and a transition portion 51c formed subsequently thereto are integrally formed and a valve hole 58 is formed in the center is fitted to the case 51. The bottom portion 51a may be formed together, and the stopper 54 may be integrated with the case 51 so that the spring 53 is elastically mounted between the valve body 52 and the partition member 56 housed in the case. Also in such a configuration, as shown in FIG. 4, the valve element 50 has a valve head 52a formed at the distal end thereof, and is formed following the valve head, and accommodates a spring 53 on the back surface. It has a cylindrical body 52b having a recess 61 formed therein, and guide blades 52c (52c1, 52c2, 52c3) protruding from the outer peripheral surface of the body 52b. Also in this example, a plurality of guide blades 52c are provided at intervals on the outer peripheral surface of the body, and between adjacent guide blades, the refrigerant gas flowing into the case 51 from the valve hole 58 into the valve body 52 is provided. 52d, which is a flow path part that is circulated downstream of the flow path. Further, three adjacent guide blades are provided at intervals of approximately 90 degrees, and one guide blade 52c3 is formed with a circumferential width of approximately 90 degrees at the central angle (guide blade 52c1). From the portion located diagonally to the guide blade portion 52c2). Therefore, the flow path portion 52d (the flow path of the working fluid formed between the valve body 52 and the inner peripheral surface of the case 51) in which the working fluid passes beside the valve body in the case has three circumferential positions. It is arranged eccentrically around the axis of the valve element 51.

  Even in such a configuration, when the working fluid flows out through the check valve 50, it is possible to always draw the valve body near the flow path through which a large amount of working fluid flows, and the self-excited vibration of the valve body Can be suppressed.

  In the above configuration, a guide blade 52c is provided to project outward from the body 52b of the valve 52 in order to guide the movement of the valve 52, and the width of the guide blade in the circumferential direction is made different. The flow path of the working fluid formed between the body 52 and the inner peripheral surface of the case 51 is formed so as to be unevenly distributed around the axis of the valve body 52. Is not limited thereto.

  For example, the flow path of the working fluid may be formed so as to be unevenly distributed around the axis of the valve body by making the interval between the adjacent guide blade portions 52c different. The flow path of the working fluid may be unevenly distributed by changing the circumferential width of the blades or changing the distance between adjacent guide blades.

  As shown in FIG. 7, in order to deviate the flow of the working fluid flowing around the valve body, as shown in FIG. 7, the flow of the working fluid immediately after the check valve is deviated from the axis of the valve body 52 to form a deviated flow. The means may be provided downstream of the check valve 50 (between the check valve 50 and the discharge port 38a).

This drift forming means may be formed by providing a throttle portion 80 for narrowing the passage cross section on the discharge passage immediately after the check valve 50, and displacing the throttle portion 80 from the axis of the valve body. In this example, the throttle portion 80 is formed integrally with the cover 38, and relays between the check valve 50 and the working fluid flowing out of the check valve toward the throttle portion 80 without any resistance. A space 81 is formed.
In this example, when the pressure immediately after the check valve rises abnormally, a relief passage 82 leading to a relief valve for releasing the pressure is connected to the relay space 81.

  By adopting such a configuration, as shown in FIG. 8, in the relay space 81 between the check valve 50 and the throttle unit 80, the working fluid flowing out of the check valve 50 largely changes its flow direction. As a result, the working fluid flowing around the valve body 52 in the case 51 tends to flow more toward the throttle portion 80, and this is combined with the uneven distribution of the flow passage portion 52 d. It is possible to more effectively deviate the flow of the working fluid flowing around the valve body.

  In particular, due to the above-described uneven flow forming means and the formation of the unevenly distributed flow path, the unevenly distributed flow path portion 52d around the valve body is rotated by the working fluid flowing around the valve body, and the working fluid immediately after the check valve is actuated. Has been found to be directed to the side (throttle section side), the amount of working fluid flowing through the throttle section side of the valve body further increases, and the valve body is moved toward the side where the working fluid immediately after the check valve is biased. The force attracting to the inner peripheral surface of the case is further increased. Therefore, the self-excited vibration can be effectively suppressed, and the pressure pulsation and noise of the working fluid due to the self-excited vibration can be effectively reduced.

Reference Signs List 4 crank chamber 7 shaft 15 cylinder bore 16 piston 20 swash plate 33 suction chamber 34 discharge chamber 40 discharge passage 50 check valve 51 case 51a bottom 52 valve body 52a valve head 52b body 52c guide blade 52d flow path 53 spring 54 Stopper 55 Damper chamber 56 Partition member 58 Valve hole
61 recess 65 gas passage 80 throttle

Claims (6)

A check valve is provided on a discharge passage for sending the compressed working fluid to the outside,
This check valve is
A cylindrical case in which the bottom is provided integrally or separately,
A valve hole formed in the bottom portion,
A valve body that is movable in the case along the depth direction of the case and opens and closes the valve hole;
A spring for urging the valve body toward the bottom,
In the compressor having
A compressor, wherein a flow path of the working fluid formed between the valve body and an inner peripheral surface of the case is formed so as to be unevenly distributed around an axis of the valve body. The valve body is formed following the valve head, which opens and closes the valve hole,
A body portion having a concave portion formed on the back surface, and a guide blade portion protruding from the outer peripheral surface of the body portion and capable of slidingly contacting the inner peripheral surface of the case;
The flow path is formed between the adjacent guide blades around the trunk,
2. The compressor according to claim 1, wherein the flow passage is formed so as to be unevenly distributed around an axis of the valve body by changing a circumferential width of the guide blade. 3. The check valve is
The bottom is integrally formed with the case;
A stopper that is fixed to an opening end of the case and regulates movement of the valve body;
The compressor according to claim 1, wherein the spring is elastically mounted between the valve body and the stopper. The check valve is
The bottom is formed by a bottom member fitted to the case;
A stopper for restricting the movement of the valve body is integrally formed on the side of the case opposite to the side where the bottom member is fitted,
The compressor according to claim 1, wherein the spring is elastically mounted between the valve body and the stopper.   The discharge passage is further provided with a non-uniform flow forming means for flowing the working fluid flowing out of the check valve so as to be deviated from the axis of the valve immediately after the check valve. The compressor according to claim 1.   The compressor includes a shaft that penetrates through a crank chamber and is rotatably supported by a housing, a swash plate that rotates in synchronization with the rotation of the shaft, and that is provided to be tiltable with respect to the shaft. A piston moored at the periphery of the plate and reciprocatingly sliding within a cylinder bore formed in the housing with rotation of the swash plate; and a suction chamber and a discharge chamber selectively communicating with the cylinder bore by reciprocating sliding of the piston. The compressor according to any one of claims 1 to 5, wherein the compressor is a variable displacement swash plate type compressor that controls discharge capacity by changing a tilt angle of the swash plate.

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