JP2009074431A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor which can prevent the occurrence of a malfunction that a relief valve falls off from an attachment hole even under the action of abnormal high pressure from a discharge pressure area. <P>SOLUTION: The relief valve 30 of the refrigerant compressor 11 is inserted and provided from the opening on the discharge chamber Da side of the attachment hole 15 to the inside of the attachment hole 15 so that an inflow opening 38 is positioned on the discharge chamber Da side of the attachment hole 15 and that a discharge opening 45 is positioned on the atmospheric side of the attachment hole 15. The movement of the relief valve 30 to the discharge chamber Da side in the attachment hole 15 is regulated by the engagement between an engagement convexity 34 of a casing 31 and the engagement concavity 15d of the attachment hole 15. Furthermore, the movement of the relief valve 30 to the atmosphere side in the attachment hole 15 is regulated by the engagement between the engagement step part 36 of the casing 31 and the engagement step 15c of the attachment hole 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor in which a relief valve for releasing pressure in a discharge pressure region is mounted in a mounting hole.

  For example, during operation of a refrigerant compressor used in a refrigeration circuit of a vehicle air conditioner, a discharge chamber formed in the refrigerant compressor is in a high pressure state, but the pressure in the discharge chamber exceeds a predetermined value and becomes abnormally high. In this case, it is necessary to reduce the pressure in the discharge chamber and prevent the refrigerant compressor from being destroyed. For this reason, the refrigerant compressor is equipped with a relief valve for releasing the refrigerant gas (pressure) in the discharge chamber to the outside (see, for example, Patent Document 1 and Patent Document 2).

  The relief valve of Patent Document 1 includes a cup-shaped body made of a synthetic resin, a pressure inlet is formed at the center bottom of the body, and a valve seat is formed at the inner periphery of the pressure inlet. A valve element is accommodated in the body, and a compression coil spring is accommodated inside the valve element guide portion of the valve element. A plate made of a synthetic resin having a passage in the center is fixed to the upper opening of the body. The compression coil spring is interposed between the valve body and the plate. And the relief valve of patent document 1 is equipped with the refrigerant | coolant compressor by screwing the external screw provided in the lower outer peripheral surface of the body to the recessed part recessed from the exterior side of the housing to the discharge chamber vicinity. Yes.

In addition, the relief valve of Patent Document 2 has a housing in which a valve body and a spring are housed in a valve chamber recessed from the outer side to the vicinity of the discharge chamber, and the opening of the valve chamber is closed on the outer side of the housing. The valve cover is attached to the refrigerant compressor. The valve lid is fixed by crimping with a convex member protruding from the outer surface of the housing, or is fixed to the housing by a screwed relationship formed between the peripheral surface of the valve lid and the peripheral surface of the valve chamber. An inflow hole for connecting the discharge chamber and the valve chamber is formed in the housing, and a discharge hole for connecting the valve chamber and the atmosphere is formed in the valve lid. The spring is interposed between the valve body and the valve lid.
JP 2001-12628 A JP 2004-360491 A

  However, the relief valve of Patent Document 1 is installed in the refrigerant compressor by screwing the male screw of the body into the recess from the outside of the housing. For this reason, when the pressure in the discharge chamber becomes abnormally high and the abnormal high pressure acts on the valve body, the plate is strongly pressed from the concave portion to the atmosphere side through the valve body and the compression coil spring, and the plate is detached. There is a risk that the relief valve itself may fall out of the recess. The relief valve of Patent Document 2 is also provided in the refrigerant compressor with a valve body and a spring housed in the valve chamber from the outside of the housing, and a valve lid fixed to the housing so as to close the opening of the valve chamber. . When the pressure in the discharge chamber becomes abnormally high and the abnormal high pressure acts on the valve body, the valve cover is strongly pressed from the valve chamber to the atmosphere via the valve body and the spring, and the valve cover is removed from the valve chamber. There is a possibility that a problem may occur that the relief valve comes off and falls from the housing.

  An object of the present invention is to provide a compressor capable of preventing the occurrence of a problem that a relief valve drops off from a mounting hole even when an abnormal high pressure is applied from a discharge pressure region.

  In order to solve the above problems, the invention according to claim 1 is characterized in that the housing has one end communicating with the discharge pressure region and the other end opened to the atmosphere, and the discharge pressure region communicates with the atmosphere. And a relief valve for releasing the pressure in the discharge pressure region is mounted in the attachment hole, and the relief valve is a flow into which gas from the discharge pressure region flows. A valve comprising a casing made by welding a synthetic resin body formed with an inlet and a synthetic resin stopper formed with a discharge port for discharging the gas, and for opening and closing the inflow port in the casing And a compression spring that urges the valve body in a direction to close the inlet, and a support portion that supports the compression spring is formed in the casing in the vicinity of the discharge port. The relief valve is positioned from the opening on the discharge pressure region side of the mounting hole so that the inlet is positioned on the discharge pressure region side of the mounting hole and the discharge port is positioned on the atmosphere side of the mounting hole. It is inserted into the mounting hole and mounted, and the positioning means restricts the movement toward the discharge pressure region in the mounting hole. Further, the locking step formed in the casing and the mounting hole Movement to the atmosphere side in the mounting hole is restricted by the locking with the formed locking step.

  According to this configuration, the relief valve is mounted by being inserted into the mounting hole from the opening on the discharge pressure region side of the mounting hole. In the mounting state in the mounting hole, the movement of the relief valve to the atmosphere side in the mounting hole is prevented by the locking of the locking step portion of the casing and the locking step of the mounting hole. Therefore, even if an abnormal high pressure acts on the relief valve from the discharge pressure region, it is possible to prevent the relief valve from moving to the atmosphere due to the engagement between the engagement step portion of the casing and the engagement step of the mounting hole. it can.

  The relief valve may be entirely accommodated in the mounting hole. According to this configuration, the relief valve does not get in the way, for example, when the compressor is mounted on a vehicle or when the compressor is transported.

  The casing has a cylindrical shape and the mounting hole has a circular shape, and the positioning means includes an engaging convex portion provided over the entire outer peripheral surface of the casing, and the engaging convex portion. And an engaging recess provided over the entire circumference of the peripheral surface of the mounting hole.

  According to this configuration, for example, when the outer shape of the engaging convex portion is formed in a polygonal shape, and the engaging concave portion that allows the engaging convex portion of the polygonal shape to be engaged is formed by grooving the mounting hole. In comparison, the engagement recess can be easily formed.

  The housing is formed of a cylinder block and a front housing and a rear housing joined to the cylinder block, and the positioning means is interposed between the cylinder block and the rear housing, and is disposed on the discharge pressure region side of the mounting hole. You may consist of the valve and port formation body with which the axial direction end of the located casing contact | abuts.

  According to this configuration, when the relief valve is mounted in the mounting hole, one end of the casing in the axial direction contacts the valve / port formation body to move toward the discharge pressure region in the mounting hole of the relief valve. Is blocked.

  According to the present invention, it is possible to prevent the occurrence of a problem that the relief valve drops from the mounting hole even when an abnormal high pressure acts from the discharge pressure region.

(First embodiment)
Hereinafter, a first embodiment in which a compressor according to the present invention is embodied in a refrigerant compressor used in a refrigeration circuit of a vehicle air conditioner will be described with reference to FIGS. 1 and 2.

First, the refrigeration circuit of the vehicle air conditioner will be described.
As shown in FIG. 1, the refrigeration circuit 10 squeezes the refrigerant from the refrigerant compressor 11 that compresses the refrigerant gas as gas, the condenser C that cools the high-pressure refrigerant gas from the refrigerant compressor 11, and the refrigerant from the condenser C. An expansion valve V and an evaporator E for evaporating the refrigerant from the expansion valve V are provided. The refrigerant compressor 11 has a relief valve 30 for releasing the refrigerant gas in the discharge chamber Da to the atmosphere in order to release the pressure in the discharge chamber Da when the discharge chamber Da, which is a discharge pressure region, becomes an abnormally high pressure. Equipped.

  The housing of the refrigerant compressor 11 includes a cylinder block 12, a front housing 13 joined to the front side of the cylinder block 12, and a rear housing 14 joined to the rear side of the cylinder block 12. The cylinder block 12, the front housing 13, and the rear housing 14 are fastened together by a plurality of (for example, five) bolts B. A discharge chamber Da and a suction chamber Sa are defined between the cylinder block 12 and the rear housing 14 in the housing. In the refrigerant compressor 11, a valve plate 19 as a valve / port forming body, a discharge valve forming plate 20, a suction valve forming plate 21, and a retainer are disposed between the rear housing 14 and the cylinder block 12. A gasket 22 is interposed.

  In the valve plate 19, a discharge port 19a is formed at a position corresponding to the discharge chamber Da, and a suction port 19b is formed at a position corresponding to the suction chamber Sa. The discharge valve forming plate 20 is formed with a discharge valve 20a at a position corresponding to the discharge port 19a. The discharge valve 20a opens and closes the discharge port 19a. In addition, a retainer 22a is formed in the retainer gasket 22, and the retainer 22a regulates the opening degree of the discharge valve 20a. The suction valve forming plate 21 is formed with a suction valve 21a at a position corresponding to the suction port 19b. The suction valve 21a opens and closes the suction port 19b.

  A suction passage 16 is formed in the rear housing 14. One end of the suction passage 16 communicates with the suction chamber Sa, and the other end of the suction passage 16 is connected to the evaporator E in the refrigeration circuit 10. A discharge passage 17 is formed in the rear housing 14. One end of the discharge passage 17 communicates with the discharge chamber Da, and the other end of the condenser C in the refrigeration circuit 10 is connected. The refrigerant compressor 11 compresses the refrigerant gas sucked from the suction chamber Sa in a compression chamber (not shown), and discharges the compressed high-pressure refrigerant gas to the discharge chamber Da. The refrigerant gas discharged into the discharge chamber Da flows into the condenser C from the discharge passage 17. Further, the refrigerant that has passed through the expansion valve V and the evaporator E flows from the suction passage 16 into the suction chamber Sa.

  As shown in FIG. 2, the rear housing 14 is formed with a circular mounting hole 15. One end of the mounting hole 15 communicates with the discharge chamber Da (discharge pressure region) and the other end of the refrigerant compressor 11. Open to the atmosphere, which is the outside. The mounting hole 15 communicates the discharge chamber Da with the atmosphere. The mounting hole 15 has a large-diameter portion 15a on the discharge chamber Da side, and has a small-diameter portion 15b having a smaller diameter than the large-diameter portion 15a on the atmosphere side from the large-diameter portion 15a. Then, on the peripheral surface of the mounting hole 15, a locking step 15 c is formed over the entire periphery of the mounting hole 15 between the large diameter portion 15 a and the small diameter portion 15 b. Further, on the peripheral surface of the mounting hole 15, an engaging concave portion 15 d as a positioning means is formed in the edge of the large diameter portion 15 a on the discharge chamber Da side over the entire circumference of the mounting hole 15. A relief valve 30 is mounted in the mounting hole 15 configured as described above.

Next, the configuration of the relief valve 30 will be described.
The outer shell of the relief valve 30 is formed by a cylindrical casing 31. The casing 31 is formed by welding and integrating a cylindrical body 32 and a cylindrical stopper 33 by ultrasonic welding. The body 32 and the stopper 33 are made of a thermoplastic resin (for example, a polyetherimide resin) which is a synthetic resin. The direction in which the central axis L of the casing 31 extends is the axial direction of the casing 31, the discharge chamber Da side in the casing 31 is one end side in the axial direction of the casing 31, and the atmospheric side is the other end side in the axial direction of the casing 31. In the relief valve 30, the total length of the casing 31 along the axial direction is shorter than the length between the opening on the discharge chamber Da side and the opening on the atmosphere side in the mounting hole 15.

  On the outer peripheral surface of one end side (body 32) in the axial direction of the casing 31, an engaging convex portion 34 as a positioning means is formed over the entire circumference of the casing 31, and the engaging convex portion 34 is engaged with the mounting hole 15. The recess 15d can be engaged. Further, a locking step portion 36 is formed over the entire circumference of the casing 31 on the outer peripheral surface of the axially central portion (stopper 33) of the casing 31, and the locking step portion 36 is a locking step 15 c of the mounting hole 15. Can be locked to. That is, the casing 31 has a larger diameter on the body 32 side than on the stopper 33 side.

  A valve chamber 37 is formed in the casing 31. An inlet 38 into which refrigerant gas flows is formed at one end in the axial direction of the casing 31 on the discharge chamber Da side of the body 32, and the inlet 38 connects the discharge chamber Da and the valve chamber 37. Communicate. In the casing 31, a cylindrical valve seat 39 is erected around the inflow port 38 toward the inside of the valve chamber 37.

  At the other end in the axial direction of the casing 31 and at the end face (the other end face) of the stopper 33 on the atmosphere side, a discharge port 45 for discharging refrigerant gas is formed. The discharge port 45 communicates the valve chamber 37 and the atmosphere. Yes. Further, in the casing 31, the periphery (near) of the discharge port 45 is in contact with the other end of the compression spring 44 made of a coil spring housed in the valve chamber 37, and becomes a support portion 33 a that supports the compression spring 44. Yes.

  A valve body 40 is accommodated in the valve chamber 37. The valve body 40 has a substantially cylindrical shape, and a seal rubber 41 is attached to an end surface of the valve body 40 on the valve seat 39 side. A slight gap (not shown) is formed between the peripheral surface of the valve body 40 and the inner peripheral surface of the body 32 facing the peripheral surface, and the valve body 40 is in contact with and away from the valve seat 39. It can move along the direction (the axial direction of the casing 31). And the valve body 40 opens and closes the inflow port 38 by contacting / separating with respect to the valve seat 39. FIG. Further, in the valve body 40, a spring mounting portion 40c is erected on the end face facing away from the end face where the seal rubber 41 is mounted.

  In the valve chamber 37, one end of the compression spring 44 is attached to the spring attachment portion 40c so as to surround the spring attachment portion 40c, one end of the compression spring 44 abuts on the valve body 40, and the other end of the compression spring 44 is The support part 33a in the casing 31 is abutted and supported. The compression spring 44 urges the valve body 40 toward the valve seat 39 and urges the inflow port 38 in a closing direction. A seal member 35 is attached to the outer peripheral surface of the body 32, and the seal member 35 prevents the refrigerant gas from leaking between the outer peripheral surface of the casing 31 and the peripheral surface of the mounting hole 15.

  The relief valve 30 configured as described above is inserted into the mounting hole 15 of the rear housing 14 before the housing of the refrigerant compressor 11 is assembled. At this time, the relief valve 30 is inserted into the opening of the mounting hole 15 on the discharge chamber Da side (discharge pressure region side) from the other axial end side of the casing 31. Then, when the relief valve 30 is inserted into the mounting hole 15 until the locking step portion 36 is locked to the locking step 15c, the engaging convex portion 34 is engaged with the engaging concave portion 15d, and the relief valve 30 is connected to the mounting hole 15. Installed inside. The relief valve 30 is entirely accommodated in the mounting hole 15 so that the relief valve 30 does not protrude from the end surface of the rear housing 14 to the outside of the rear housing 14.

  When the relief valve 30 is mounted in the mounting hole 15, the inlet 38 is positioned on the discharge chamber Da side of the mounting hole 15 and the discharge port 45 is positioned on the atmosphere side of the mounting hole 15. Furthermore, the relief valve 30 is provided by positioning means comprising an engagement relationship provided between the outer peripheral surface of the casing 31 and the peripheral surface of the mounting hole 15, that is, an engagement relationship between the engagement convex portion 34 and the engagement concave portion 15d. The movement of the mounting hole 15 toward the discharge chamber Da is restricted. Further, the mounting hole 15 of the relief valve 30 is provided by a locking relationship provided between the outer peripheral surface of the casing 31 and the peripheral surface of the mounting hole 15, that is, a locking relationship between the locking step portion 36 and the locking step 15c. Movement to the atmosphere side is restricted.

  Next, the function of the relief valve 30 configured as described above will be described. If the discharge chamber Da of the refrigerant compressor 11 is not at an abnormally high pressure, the force in the valve opening direction acting on the valve body 40 based on the pressure in the discharge chamber Da is small. Therefore, the spring force of the compression spring 44 is dominant in positioning the valve body 40, and the valve body 40 is in contact with the valve seat 39. Therefore, the communication between the inlet 38 and the valve chamber 37 is not blocked by the valve body 40, and the refrigerant gas in the discharge chamber Da is not released from the relief valve 30 to the atmosphere.

  If the discharge chamber Da is going to rise to an abnormally high pressure for some reason from this state, the force in the valve opening direction acting on the valve body 40 based on the pressure of the discharge chamber Da becomes excessive. Therefore, the valve body 40 moves against the spring force of the compression spring 44 and moves away from the valve seat 39. Accordingly, the communication between the inlet 38 and the valve chamber 37 is opened by the valve body 40, and the refrigerant gas in the discharge chamber Da is discharged to the atmosphere via the inlet 38, the valve chamber 37 and the discharge port 45, and discharged. Abnormal pressure rise in the chamber Da is prevented, and destruction of the housing due to abnormal high pressure is prevented.

  Further, when the discharge chamber Da is going to rise to an abnormal high pressure, the abnormal high pressure acts on one end of the casing 31 in the axial direction and the valve body 40, and the casing 31 and the valve body 40 are strongly pressed to the atmosphere side. At this time, the relief valve 30 is engaged with the engagement convex portion 34 of the casing 31 and the engagement concave portion 15d of the mounting hole 15, and further, the locking step portion 36 of the casing 31 and the locking step 15c of the mounting hole 15. The relief valve 30 is prevented from moving to the atmosphere side by the locking.

According to the above embodiment, the following effects can be obtained.
(1) The relief valve 30 is mounted by being inserted into the mounting hole 15 from the opening of the mounting hole 15 on the discharge chamber Da side. In the mounting state in the mounting hole 15, the locking step portion 36 of the casing 31 is locked to the locking step 15 c of the mounting hole 15, so that the relief valve 30 moves to the atmosphere side in the mounting hole 15. Movement is blocked. Further, the engagement convex portion 34 of the casing 31 is engaged with the engagement concave portion 15 d of the mounting hole 15, so that the movement of the casing 31 toward the discharge chamber Da and the atmosphere side within the mounting hole 15 is restricted. . Therefore, even if an abnormal high pressure acts on the relief valve 30 from the discharge chamber Da, the relief valve 30 can be prevented from moving to the atmosphere side, and the relief valve 30 can be prevented from dropping out of the mounting hole 15. Can do.

  (2) An engaging convex portion 34 is formed in the casing 31, and an engaging concave portion 15 d is formed in the mounting hole 15. When the relief valve 30 is inserted into the mounting hole 15 and the engaging convex portion 34 is engaged with the engaging concave portion 15d, an engaging sound is generated. For this reason, when the relief valve 30 is mounted in the mounting hole 15, it can be confirmed by the engagement sound whether the relief valve 30 is mounted at a predetermined position of the mounting hole 15.

  (3) Engagement of the engaging convex portion 34 and the engaging concave portion 15d restricts movement of the relief valve 30 toward the discharge chamber Da in the mounting hole 15. Therefore, when the discharge chamber Da of the refrigerant compressor 11 is evacuated, the relief valve 30 can be prevented from moving toward the discharge chamber Da of the mounting hole 15.

  (4) The casing 31 has a cylindrical shape, and the engaging convex portion 34 is formed over the entire outer peripheral surface of the casing 31. The mounting hole 15 has a circular shape, and the engaging recess 15 d is formed over the entire circumference of the peripheral surface of the mounting hole 15. For this reason, for example, the casing 31 is formed in a hexagonal cylindrical shape, the outer shape of the engaging convex portion 34 is formed in a hexagonal shape, and the engaging concave portion 15d that can engage the hexagonal engaging convex portion 34 is mounted. Compared with the case where the hole 15 is formed by grooving, the engaging recess 15d can be easily formed.

  (5) The mounting hole 15 is formed by drilling the rear housing 14 from the discharge chamber Da. When the relief valve 30 is inserted from the opening of the mounting hole 15 on the discharge chamber Da side, the other axial end of the casing 31 does not protrude out of the mounting hole 15. That is, the entire relief valve 30 is accommodated in the mounting hole 15. Therefore, the relief valve 30 does not get in the way when the refrigerant compressor 11 is mounted on a vehicle or when the refrigerant compressor 11 is transported.

  (6) The casing 31 is made of synthetic resin. Therefore, material costs can be reduced as compared with the case where the casing 31 is made of aluminum. The casing 31 (the body 32 and the stopper 33) is formed by injection molding, and the engaging convex portion 34, the locking step portion 36 and the like for mounting the relief valve 30 by restricting movement into the mounting hole 15 are injection molded. In this case, it is integrally formed. Therefore, unlike the case where the casing 31 is made of aluminum, it is not necessary to process a male screw or the like for mounting the relief valve 30 to the refrigerant compressor 11, and the processing cost of the casing 31 can be reduced and the engagement convexity can be reduced. The precision of the part 34, the locking step part 36, etc. can be made favorable.

  (7) The relief valve 30 is mounted in a state where the relief valve 30 is positioned in the mounting hole 15 by engaging the engaging convex portion 34 with the engaging concave portion 15 d of the mounting hole 15 while being entirely accommodated in the mounting hole 15. Is done. Therefore, for example, when the relief valve is made of aluminum and the male screw provided on the relief valve is screwed into the rear housing and installed in the refrigerant compressor, the relief valve is rotated by a tool and screwed, It is not necessary to project the end of the relief valve for hooking the tool from the housing. Therefore, the refrigerant compressor 11 does not require a space for the protruding end portion of the relief valve, and it is not necessary to secure a space for moving a tool for screwing the relief valve. The mounting space can be reduced. In addition, since the relief valve 30 is simply inserted into the mounting hole 15 and positioned in the mounting hole 15, it can be easily installed in the refrigerant compressor 11 as compared with the case where the relief valve is screwed.

(Second Embodiment)
Next, a second embodiment in which the compressor of the present invention is embodied will be described with reference to FIGS. In the embodiment described below, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the redundant description thereof is omitted or simplified. FIG. 3 is a view of the refrigerant compressor 11 as seen from the retainer gasket 22 toward the rear housing 14, and FIG. 4 is a cross-sectional view of the relief valve 30. In the second embodiment, the engagement convex portion 34 is not formed on the casing 31 of the relief valve 30.

  As shown in FIG. 4, the mounting hole 50 is formed on the outer peripheral side of the discharge chamber Da in the rear housing 14, and one end of the mounting hole 50 opens toward the retainer gasket 22. In the retainer gasket 22, a circular communication hole 22 b is formed at a position facing the mounting hole 50. The diameter of the communication hole 22 b is smaller than the outer diameter on one end side in the axial direction of the casing 31, and the center point of the communication hole 22 b is located on the central axis L of the casing 31.

  As shown in FIG. 3, the retainer gasket 22 is formed with a plurality of recesses 22 c along the opening of the discharge chamber Da formed in the rear housing 14. In the retainer gasket 22, a seal portion 22 d that is sandwiched between the end surface of the rear housing 14 on the cylinder block 12 side and the end surface of the cylinder block 12 and suppresses leakage of the refrigerant gas from the discharge chamber Da is formed at the periphery of each recess 22 c. Has been. The retainer gasket 22 is formed with a communication groove 22e that communicates the communication hole 22b with one recess 22c. Therefore, the discharge chamber Da and the communication hole 22b communicate with each other through the communication groove 22e, and the discharge chamber Da, the concave portion 22c, the communication groove 22e, and the communication hole 22b serve as a discharge pressure region.

  As shown in FIG. 4, one end of the mounting hole 50 communicates with the communication hole 22 b of the retainer gasket 22, and the other end is opened to the atmosphere outside the refrigerant compressor 11. Therefore, in the mounting hole 50, the retainer gasket 22 side has a large diameter portion 50a, and the atmosphere side from the large diameter portion 50a has a small diameter portion 50b smaller in diameter than the large diameter portion 50a. Further, a locking step 50 c is formed on the peripheral surface of the mounting hole 50 over the entire periphery of the mounting hole 50 between the large diameter portion 50 a and the small diameter portion 50 b.

  The relief valve 30 is inserted into the mounting hole 50 of the rear housing 14 before assembling the refrigerant compressor 11. At this time, the relief valve 30 is inserted into the opening of the retainer gasket 22 in the mounting hole 50 on the communication hole 22 b side (discharge pressure region side) from the other axial end side of the casing 31. When the relief valve 30 is inserted into the mounting hole 50 until the locking step portion 36 is locked to the locking step 50 c, the entire relief valve 30 is accommodated in the mounting hole 50, and the rear valve 14 extends from the end surface of the rear housing 14. The relief valve 30 does not protrude outside the housing 14.

  In a state where the relief valve 30 is mounted in the mounting hole 50, the inflow port 38 is positioned on the side of the mounting hole 50 on the communicating hole 22 b side of the retainer gasket 22 and the discharge port 45 is positioned on the atmosphere side of the mounting hole 50. . Then, the valve plate 19, the valve forming plate 20, the valve forming plate 21, and the retainer gasket 22 are interposed between the cylinder block 12 and the rear housing 14, and the cylinder block 12, the front housing 13, and the rear housing are formed by bolts B. 14 is fastened together to form a housing.

  In the relief valve 30, one axial end of the casing 31 is in contact with the peripheral edge of the communication hole 22 b in the retainer gasket 22. Therefore, the movement of the relief valve 30 toward the communication hole 22 b in the mounting hole 50 is restricted by the positioning means having a contact relationship between one end of the casing 31 and the retainer gasket 22. Further, the mounting hole 50 of the relief valve 30 is provided by a locking relationship provided between the outer peripheral surface of the casing 31 and the peripheral surface of the mounting hole 50, that is, a locking relationship between the locking step portion 36 and the locking step 50c. Movement to the atmosphere side is restricted.

Therefore, according to 2nd Embodiment, in addition to the effect similar to (5)-(7) as described in 1st Embodiment, the following effects can be acquired.
(8) The relief valve 30 is mounted in the mounting hole 50 by being inserted into the mounting hole 50 from the opening on the communication hole 22 b side of the retainer gasket 22. In the mounting state in the mounting hole 50, the locking step portion 36 of the casing 31 is locked to the locking step 50 c of the mounting hole 50, so that the relief valve 30 moves to the atmosphere side in the mounting hole 50. Is blocked. Further, when one end of the casing 31 in the axial direction is in contact with the retainer gasket 22, the movement of the casing 31 toward the retainer gasket 22 in the mounting hole 50 is restricted. Therefore, even if an abnormal high pressure from the discharge pressure region acts on the relief valve 30, the relief valve 30 can be prevented from moving to the atmosphere side, and the relief valve 30 can be prevented from dropping out of the mounting hole 50. be able to.

  (9) The mounting hole 50 is formed by drilling the rear housing 14. When the relief valve 30 is inserted into the mounting hole 50, the other axial end of the casing 31 does not protrude outside the mounting hole 50. That is, the entire relief valve 30 is accommodated in the mounting hole 50. Therefore, the relief valve 30 does not get in the way when the refrigerant compressor 11 is mounted on a vehicle or when the refrigerant compressor 11 is transported.

In addition, you may change this embodiment as follows.
○ In the second embodiment, one end of the casing 31 in the axial direction is in contact with the retainer gasket 22, but the valve / port formation that contacts the casing 31 faces the mounting hole of the rear housing in the refrigerant compressor. The valve / port forming body is not limited to the retainer gasket 22.

In the first embodiment, an engagement concave portion may be provided on the outer peripheral surface of the casing 31 and an engagement convex portion may be provided on the peripheral surface of the mounting hole 15.
The relief valve 30 may have the other axial end of the casing 31 protruding from the mounting hole 15 to the atmosphere.

  In each embodiment, the refrigerant compressor 11 is embodied to constitute the refrigeration circuit 10 of the vehicle air conditioner, but the refrigerant compressor 11 constitutes a refrigeration circuit of an air conditioner other than the vehicle air conditioner, You may actualize to what is used for refrigeration circuits other than an air conditioner.

Next, the technical idea that can be grasped from the above embodiment and other examples will be described below.
(1) The compressor according to claim 4, wherein the valve / port forming body is a retainer gasket that is sandwiched between a cylinder block and a rear housing and includes a seal portion that suppresses gas leakage from the discharge chamber.

The fragmentary sectional view which shows the refrigerating circuit containing a refrigerant compressor. Sectional drawing which shows the relief valve and mounting | wearing hole of 1st Embodiment. The figure which shows the retainer gasket and relief valve in 2nd Embodiment. Sectional drawing which shows the relief valve and mounting | wearing hole in 2nd Embodiment.

Explanation of symbols

  Da ... discharge chamber as discharge pressure region, 11 ... refrigerant compressor as compressor, 12 ... cylinder block forming housing, 13 ... front housing forming housing, 14 ... rear housing forming housing, 15, 50 ... mounting holes, 15c, 50c ... locking step, 15d ... engaging recess as positioning means, 22 ... retainer gasket as valve / port forming body, 22b ... communication hole as discharge pressure area, 22c ... as discharge pressure area , 22e: communication groove as a discharge pressure region, 30: relief valve, 31: casing, 32: body, 33: stopper, 33a: support part, 34: engagement convex part as positioning means, 36: locking Step part 38 ... Inlet port 40 ... Valve body 44 ... Compression spring 45 ... Release port.

Claims (4)

One end of the housing communicates with the discharge pressure region and the other end opens toward the atmosphere, and a mounting hole that connects the discharge pressure region and the atmosphere is formed, and the pressure of the discharge pressure region is formed in the mounting hole. A compressor equipped with a relief valve for opening,
The relief valve is formed by welding a synthetic resin body in which an inflow port into which gas from the discharge pressure region flows is formed and a synthetic resin stopper in which a discharge port for discharging the gas is formed. The casing includes a valve body that opens and closes the inflow port, and a compression spring that urges the valve body in a direction to close the inflow port, and the casing includes the compression spring. A supporting portion for supporting is formed in the vicinity of the discharge port in the stopper;
The relief valve is located in the mounting hole from the opening on the discharge pressure region side of the mounting hole so that the inlet is positioned on the discharge pressure region side of the mounting hole and the discharge port is positioned on the atmosphere side of the mounting hole. Inserted into the mounting hole, and the movement to the discharge pressure region side in the mounting hole is restricted by the positioning means, and further, the locking step portion formed in the casing and the mounting hole are formed. The compressor is characterized in that movement to the atmosphere side in the mounting hole is restricted by locking with a locking step.   The compressor according to claim 1, wherein the relief valve is entirely accommodated in the mounting hole.   The casing has a cylindrical shape and the mounting hole has a circular hole shape, and the positioning means includes an engaging convex portion provided over the entire outer peripheral surface of the casing, and an engaging convex portion. The compressor according to claim 1, further comprising an engaging recess formed over the entire circumference of the peripheral surface of the mounting hole.   The housing is formed of a cylinder block and a front housing and a rear housing joined to the cylinder block, and the positioning means is interposed between the cylinder block and the rear housing and is located on the discharge pressure region side of the mounting hole. The compressor according to claim 1 or 2, comprising a valve / port forming body with which one axial end of the casing abuts.

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