JP2017115688A - Check valve for compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve for a compressor, of which a portion for coming in slide contact with a valve element to guide the movement of the valve element can also function as a refrigerant passage (a valve hole).SOLUTION: The check valve for the compressor, which is provided in a refrigerant passage for refrigerant to pass therethrough, includes a valve seat member 50 having a valve hole 54 and a valve seat 53, and a valve element 60 for leaving/contacting the valve seat to open/close the valve hole. The valve element 60 has a trunk 63 to be guided to the valve hole 54, and a head 65 for, when moved together with the trunk, contacting/leaving the valve seat. The valve seat member 50 is annularly formed. An outer peripheral face 57 of the valve seat member is fixed to an inner wall surface of the refrigerant passage, and the inner peripheral face of the valve seat member forms the inner wall of the valve hole. One end side of the valve seat member forms the valve seat, and the other end side of the valve seat member forms a restriction face 51T to restrict the movement in the opening/closing direction of the valve element.SELECTED DRAWING: Figure 4

Description

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

  The compressor includes a check valve to prevent the refrigerant flowing in the refrigerant passage from flowing backward. A check valve disclosed in JP 2013-108628 A (Patent Document 1) includes a cylindrical valve seat member, a cylindrical guide member disposed inside the valve seat member, and a cylindrical guide member. And a coil spring that urges the valve rod (valve element) in the closing direction. The valve seat member and the guide member are integrally formed via a plurality of connecting portions, and an opening that functions as a refrigerant passage is formed between the valve seat member, the guide member, and the connecting portion.

JP 2013-108628 A

  In the check valve disclosed in Japanese Patent Application Laid-Open No. 2013-108628 (Patent Document 1), a body of a valve body (valve rod) is slidably fitted inside a cylindrical guide member. The valve seat member and the guide member are integrally formed through a plurality of connecting portions, and an opening that functions as a refrigerant passage (that is, a valve hole) is formed between the valve seat member, the guide member, and the connecting portion. Has been. The space formed inside the guide member is in sliding contact with the valve body in order to move the valve body stably, and does not function as a refrigerant passage. In the configuration disclosed in the publication, a portion that slides on the valve body and guides the movement of the valve body and a portion that functions as a refrigerant passage (valve hole) are provided separately. An object of the present invention is to provide a check valve for a compressor having a configuration in which a portion that slides in contact with a valve body and guides the movement of the valve body can also function as a refrigerant passage (valve hole). And

  A check valve for a compressor according to the present invention is provided in a refrigerant passage through which a refrigerant passes, and a valve seat member having a valve hole and a valve seat, and a valve seat that opens and closes the valve hole in contact with the valve seat. A check valve for a compressor including a valve body, wherein the valve body is guided by the valve hole of the valve seat member, and is disposed on the downstream side of the valve hole together with the body part. The valve seat member is formed in an annular shape, and the outer peripheral surface of the valve seat member is fixed to the inner wall surface of the refrigerant passage. The inner peripheral surface of the seat member forms the inner wall of the valve hole, one end side of the valve seat member forms the valve seat, and the other end side of the valve seat member is the valve body A restricting surface that restricts movement in the opening direction is formed.

  Preferably, the valve seat member has a peripheral wall portion and an annular portion having a shape protruding radially inward from the peripheral wall portion, and an upstream surface of the peripheral wall portion has the restriction surface. The downstream surface of the annular portion forms the valve seat, and the inner peripheral surface of the annular portion forms the valve hole.

  Preferably, the annular portion is provided so as to protrude radially inward from an end portion on the downstream side of the peripheral wall portion.

  According to said structure, the valve seat member has the internal peripheral surface which forms the inner wall of a valve hole, and the trunk | drum of a valve body is penetrated by the valve hole of a valve seat member. The inner peripheral surface of the valve seat member can slide on the valve body to guide the movement of the valve body, and can also function as a refrigerant passage (valve hole). Further, the valve seat member can regulate movement in the opening direction by cooperating with the valve body.

1 is a cross-sectional view showing a compressor in a first embodiment. It is sectional drawing along the II-II line in FIG. It is sectional drawing along the III-III line in FIG. FIG. 3 is a cross-sectional view showing a check valve in the first embodiment. It is sectional drawing along the VV line in FIG. FIG. 3 is a cross-sectional view showing a part of the check valve in Embodiment 1 in an exploded manner. FIG. 3 is a perspective view showing a first valve body part provided in the check valve in the first embodiment. It is sectional drawing which shows a mode that the non-return valve in Embodiment 1 is opening. It is sectional drawing which shows the non-return valve in a comparative example. 6 is a cross-sectional view showing a check valve in Embodiment 2. FIG. 6 is a cross-sectional view showing a check valve in Embodiment 3. FIG. It is a perspective view which shows the 1st valve body part with which the check valve in Embodiment 4 is equipped. It is a perspective view which shows the 1st valve body part with which the check valve in Embodiment 5 is equipped.

  Hereinafter, embodiments will be described with reference to the drawings. 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. FIG. 3 is a cross-sectional view taken along line III-III in FIG. The compressor 10 is a vane type compressor, is mounted on a vehicle, and is used for an air conditioner of the vehicle. Note that the check valve in each embodiment disclosed below can be applied to a scroll type, swash plate type, or roots type compressor.

  As shown in FIG. 1, the housing 11 of the compressor 10 is formed of a cylindrical rear housing 12 (shell) and a front housing 13 joined to the front end surface of the rear housing 12. The rear housing 12 has a peripheral wall 12a (see also FIGS. 2 and 3). The front housing 13 has a cylindrical cylinder block 14. The cylinder block 14 is integrated with the front housing 13 and accommodated in the rear housing 12. The material of the rear housing 12 and the front housing 13 is, for example, metal. The material of the cylinder block 14 is also a metal, for example.

  A side plate 15 is joined to the rear end surface of the cylinder block 14. The front housing 13 and the side plate 15 support the rotating shaft 16 in a rotatable manner. The rotating shaft 16 passes through the cylinder block 14. Between the rotary shaft 16 and the front housing 13, a lip seal type shaft seal device 17a is provided. The shaft seal device 17 a prevents the refrigerant gas from leaking along the peripheral surface of the rotating shaft 16.

  A rotor 18 having a cylindrical shape is provided in the cylinder block 14. The rotor 18 is fixed to the rotary shaft 16 so as to be integrally rotatable. The front end face of the rotor 18 faces the end face of the front housing 13, and the rear end face of the rotor 18 faces the end face of the side plate 15.

  As shown in FIGS. 2 and 3, the inner peripheral surface of the cylinder block 14 is formed in an elliptical shape. A rotor 18 is provided in the cylinder block 14. A plurality of vane grooves 18 a are formed on the outer peripheral surface of the rotor 18 so as to extend radially. A vane 19 is accommodated in each of the plurality of vane grooves 18a so as to be able to appear and retract. Lubricating oil (not shown) is supplied to each of the plurality of vane grooves 18a.

  As the rotary shaft 16 rotates, the rotor 18 rotates. When the tip end surface of the vane 19 contacts the inner peripheral surface of the cylinder block 14, 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), a plurality of compression chambers 21 are defined. With respect to the rotation direction of the rotor 18, the stroke in which the compression chamber 21 expands the volume is the suction stroke, and the stroke in which the compression chamber 21 decreases the volume is the compression stroke.

  As shown in FIGS. 1 and 2, a recess 14 a is formed on the outer peripheral surface of the cylinder block 14 over the entire circumference in the circumferential direction of the cylinder block 14. A suction chamber 20 communicating with the suction port 22 is defined by the recess 14 a and the inner peripheral surface of the rear housing 12. The cylinder block 14 cooperates with the inner peripheral surface of the rear housing 12 and partitions the suction chamber 20 in the rear housing 12 (shell).

  As shown in FIG. 2, the suction chamber 20 is formed between the cylinder block 14 and the rear housing 12 and extends in the circumferential direction. The portion of the inner peripheral surface of the peripheral wall 12a of the rear housing 12 where the suction port 22 is open has an arc shape. Although details will be described later, the suction port 22 forms a refrigerant passage through which the refrigerant passes, and a check valve 40 for preventing the refrigerant from flowing backward is provided in the suction port 22.

  In the radial direction of the rotating shaft 16, the suction chamber 20 and the suction port 22 are disposed so as to overlap the compression chamber 21. The cylinder block 14 is formed with a pair of suction ports 23 (FIG. 2) communicating with the suction chamber 20. During the suction stroke, the compression chamber 21 and the suction chamber 20 communicate with each other via the suction port 23.

  As shown in FIG. 3, a pair of recesses 14b are formed in the outer peripheral surface of the cylinder block 14 (see also FIG. 1). The pair of recesses 14b are located on opposite sides of the rotating shaft 16. Each recess 14b includes an extended surface 141b extending from the outer peripheral surface of the cylinder block 14 toward the rotation shaft 16, and an attachment surface 142b that intersects the extended surface 141b and extends toward the outer peripheral surface of the cylinder block 14. It is formed.

  The discharge chamber 30 is defined by the extended surface 141b, the mounting surface 142b, and the inner peripheral surface of the rear housing 12. The discharge chamber 30 is located between the cylinder block 14 and the rear housing 12 in the radial direction (see also FIG. 1). In the cylinder block 14, a discharge port 31 that connects the compression chamber 21 and the discharge chamber 30 is formed. The discharge port 31 is opened and closed by a discharge valve 32 attached to the attachment surface 142b. 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.

  As shown in FIG. 1, a discharge port 34 is formed in the peripheral wall 12 a of the rear housing 12. A joint portion 38 is connected to the discharge port 34. A discharge pipe 39 extending toward the outside of the compressor 10 (for example, a capacitor of an external refrigerant circuit) is connected to the joint portion 38.

  On the rear side of the rear housing 12, a discharge region 35 is defined by the side plate 15. An oil separator 36 is disposed in the discharge region 35. The oil separator 36 has a bottomed cylindrical case 36a, and a cylindrical oil separation cylinder 36b is fitted and fixed to the opening side of the case 36a.

  An oil passage 36c is formed in the lower part of the case 36a. The oil passage 36c communicates the inside of the case 36a with the bottom side of the discharge region 35. A communication passage 37 is formed in the side plate 15 and the case 36a (see also FIG. 3). The communication path 37 communicates the discharge chamber 30 and the case 36a. An oil supply passage 15 d is formed in the side plate 15. The oil supply passage 15d guides the lubricating oil stored on the bottom side of the discharge region 35 to the vane groove 18a.

(Check valve 40)
1 and 2, as described above, the suction port 22 is provided so as to penetrate the peripheral wall 12a of the rear housing 12 (shell), and the joint portion 24 is continuously provided on the outer portion of the suction port 22. Is done. A suction pipe 25 is connected to the joint portion 24. Refrigerant gas flows into the suction port 22 from an evaporator (not shown) through the suction pipe 25. The suction port 22 forms a refrigerant passage through which the refrigerant passes. A check valve 40 is provided in the suction port 22.

  FIG. 4 is a cross-sectional view showing the check valve 40. 5 is a cross-sectional view taken along line VV in FIG. In FIG. 5, the end surface of the peripheral wall portion 51 (regulating surface 51 </ b> T) of the valve seat member 50 is illustrated. The peripheral wall portion 51 (regulating surface 51T) of the valve seat member 50 in FIG. 5 does not represent a cross-sectional structure, but is hatched for convenience of explanation. FIG. 6 is an exploded sectional view showing a part of the check valve 40 (the valve seat member 50, the valve body 60, and the coil spring 70). The check valve 40 of the present embodiment includes a valve seat member 50, a valve body 60, and a coil spring 70 (FIG. 4).

(Valve seat member 50)
Referring mainly to FIGS. 4 and 6, the valve seat member 50 has a hollow annular shape as a whole, and has a valve hole 54 formed inside. The material of the valve seat member 50 is, for example, metal. The valve seat member 50 of the present embodiment has a shape that is rotationally symmetric about the axial direction as a whole. The valve seat member 50 includes a peripheral wall portion 51 and an annular portion 52 as its constituent parts.

  The peripheral wall portion 51 has a shape obtained by extending an annular member in the axial direction. In the present embodiment, the peripheral wall portion 51 is a member that is provided separately from the member that forms 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. (See FIG. 5).

  The annular part 52 is provided on the inner side of the peripheral wall part 51 and has a shape protruding from the inner side of the peripheral wall part 51 toward the inner side in the radial direction. In the present embodiment, the annular portion 52 is provided so as to protrude radially inward from the downstream end portion of the peripheral wall portion 51. When the sectional shape of the valve seat member 50 is viewed, a pair of L-shaped shapes appear symmetrically. The annular portion 52 may be provided so as to protrude radially inward from an intermediate portion in the axial direction of the peripheral wall portion 51.

  The valve seat member 50 is formed in an annular shape as a whole. The valve seat 53 is located on the most downstream side, the regulating surface 51T is located on the most upstream side, the inner circumferential surface 56 (FIG. 6), and the outer circumferential surface 57 (see FIG. 6).

  The valve seat 53 is formed by a surface on one end side of the valve seat member 50 in the axial direction. In the present embodiment, the downstream surface of the annular portion 52 forms the valve seat 53. The valve seat 53 is located downstream of the valve hole 54 and is formed so as to be located in a plane perpendicular to the axial direction. The valve seat 53 contacts a seal surface 65S (FIG. 6) of a valve body 60 (first valve body portion 61) described later.

  The restricting surface 51T is formed by the surface on the other end side of the valve seat member 50 in the axial direction. In the present embodiment, the upstream surface of the peripheral wall 51 forms the regulation surface 51T. Similarly to the valve seat 53, the restricting surface 51T is formed so as to be located in a plane perpendicular to the axial direction. The restricting surface 51T comes into contact with a lower end surface 68K of a valve body 60 (second valve body portion 62) described later (see FIG. 8).

  The inner peripheral surface 56 connects the radially inner portion of the valve seat 53 (the surface on one end side of the valve seat member 50) and the radially inner portion of the restricting surface 51T (the surface on the other end side of the valve seat member 50). As such, it is provided between these radially inner portions. A downstream portion of the inner peripheral surface 56 forms an inner wall of the valve hole 54.

  The inner peripheral surface 56 of the present embodiment has an inner wall 51S, a spring receiving surface 52U, and a valve hole 54. The inner wall 51 </ b> S is formed by the inner peripheral surface of the upstream portion of the peripheral wall portion 51. The spring receiving surface 52U is formed by the upstream surface of the annular portion 52. The lower end of the coil spring 70 is placed on the spring receiving surface 52U. The inner wall 51S of the valve seat member 50 restricts the movement of the coil spring 70 in the radial direction. The valve hole 54 is located inside the peripheral wall portion 51. In the present embodiment, the valve hole 54 is formed by the inner peripheral surface of the annular portion 52 of the inner peripheral surface 56.

  As shown in FIG. 4, the suction port 22 of the present embodiment includes a large diameter portion 22a, a medium diameter portion 22b located on the downstream side of the large diameter portion 22a, and a step located on the downstream side of the medium diameter portion 22b. Part 22c, and small diameter part 22d located in the downstream of level | step-difference part 22c. The inner diameter of the medium diameter portion 22b is smaller than the inner diameter of the large diameter portion 22a, and the inner diameter of the small diameter portion 22d is smaller than the inner diameter of the medium diameter portion 22b.

  The outer peripheral surface 57 of the valve seat member 50 includes a radially outer portion of the valve seat 53 (a surface on one end side of the valve seat member 50) and a radially outer side of the restricting surface 51T (the other surface side of the valve seat member 50). These are provided between these radially outer parts so as to connect the parts. The outer peripheral surface 57 in the present embodiment is formed by a surface located on the radially outer side of the peripheral wall portion 51. The valve seat member 50 is inserted into the suction port 22 (large diameter portion 22a) from the upstream side toward the downstream side. Thereafter, the valve seat member 50 (the peripheral wall portion 51) is press-fitted inside the medium diameter portion 22b. By press-fitting, the outer peripheral surface 57 of the valve seat member 50 is fixed to the inner wall surface of the suction port 22 (medium diameter portion 22b).

(Valve 60)
As shown in FIG. 4, the valve body 60 of the check valve 40 is provided in the suction port 22 (refrigerant passage), and can contact and separate from the valve seat 53 of the valve seat member 50. As will be described in detail later, the coil spring 70 is provided so as to surround the periphery of the valve body 60 (the body portion 63 of the first valve body portion 61), the valve seat member 50 (spring receiving surface 52U), and the valve body 60. It arrange | positions between the spring receiving parts 66 provided in this. The coil spring 70 biases the valve body 60 in a direction away from the suction chamber 20 (FIG. 2) (closed direction). The valve body 60 of the present embodiment is configured such that the movement in the opening direction is restricted when the lower end surface 68K provided on the valve body 60 contacts the restriction surface 51T of the valve seat member 50. (See FIG. 8).

  The valve body 60 of this Embodiment is comprised by combining the 1st valve body part 61 and the 2nd valve body part 62 which were provided as a mutually separate member. The material of the 1st valve body part 61 is resin, for example, and the material of the 2nd valve body part 62 is also resin, for example. FIG. 7 is a perspective view showing the first valve body 61.

(First valve body 61)
Referring mainly to FIG. 6 and FIG. 7, the first valve body portion 61 includes a body portion 63, a head portion 65, a raised portion 67, and an annular portion 69 as its constituent parts. The head 65 has a substantially disk shape. The head 65 is disposed on the downstream side of the valve hole 54 provided in the valve seat member 50 (see FIG. 4) and faces the suction port 22. The head 65 has a larger outer shape than the valve hole 54, and the outer peripheral portion of the surface located on the upstream side of the head 65 forms a seal surface 65S.

  The head 65 reciprocates in the axial direction together with the body 63 described below. When the sealing surface 65S (FIG. 6) of the head 65 comes into contact with and separates from the valve seat 53 of the valve seat member 50, the valve hole 54 is closed and opened. A raised portion 67 having a conical shape (conical shape in the present embodiment) is formed at the central portion of the surface located on the upstream side of the head 65.

  The body 63 is inserted inside the valve hole 54 of the valve seat member 50. The trunk portion 63 of the present embodiment has a plurality of (four in the present embodiment) columnar portions 63a to 63d (FIG. 7). The plurality of columnar parts 63 a to 63 d extend in parallel from the surface located on the upstream side of the head 65 toward the upstream side. The plurality of columnar parts 63a to 63d are provided with a gap D (FIG. 7) between them in the circumferential direction.

  An engaging claw 63T that extends toward the outside in the radial direction is provided at an end portion in the axial direction of the body portion 63 (columnar portions 63a to 63d). The annular portion 69 has a shape extending annularly in a direction intersecting with the plurality of columnar portions 63a to 63d (a direction orthogonal in the present embodiment). The annular portion 69 connects intermediate portions in the extending direction (longitudinal direction) of the plurality of columnar portions 63a to 63d.

  As shown in FIG. 6, the annular portion 69 in the present embodiment is located closer to the distal end side of the plurality of columnar portions 63 a to 63 d than the intermediate position in the extending direction of the plurality of columnar portions 63 a to 63 d. In other words, if the length dimension in the extending direction of the plurality of columnar portions 63a to 63d is H, the downstream end 69K of the annular portion 69 is located at an intermediate position (H / 2) in the extending direction of the plurality of columnar portions 63a to 63d. ) And the tip end portions of the plurality of columnar portions 63a to 63d (end portions on the side where the engaging claws 63T are provided) are preferably provided. The closer the annular portion 69 is to the tip ends of the plurality of columnar portions 63a to 63d, the more the plurality of columnar portions 63a to 63d are less likely to bend, and the plurality of columnar portions 63a to 63d can be reinforced more strongly.

  As described above, the body portion 63 (the plurality of columnar portions 63 a to 63 d) is inserted inside the valve hole 54 of the valve seat member 50. At the time of insertion, the distal end portions of the plurality of columnar portions 63a to 63d bend toward the inner diameter side using the annular portion 69 as a starting point of elastic deformation as the engaging claw 63T gets over the inner wall of the valve hole 54. The plurality of columnar portions 63 a to 63 d are arranged inside the valve hole 54 by the engagement claw 63 </ b> T getting over the inner wall of the valve hole 54.

  The trunk | drum 63 (several columnar part 63a-63d) of the 1st valve body part 61 can move relatively with respect to the valve hole 54 of the valve seat member 50, and the outer peripheral surface 63S (FIG. 6) of the trunk | drum 63 is formed. Thus, it functions as an “other outer peripheral surface” that is in sliding contact with the inner wall of the valve hole 54.

  A space S1 (FIG. 7) is formed inside the plurality of columnar portions 63a to 63d. A gap S <b> 2 is formed between the adjacent columnar parts 63 a to 63 d due to the presence of the interval D. The downstream portion of the space S1 and the downstream portion of the gap S2 are positioned downstream of the valve seat 53 when the valve is opened. Therefore, the space S1 and the gap S2 can function as a flow path through which the refrigerant passes when the valve is opened (see FIG. 8), and the trunk portion 63 is a space S1 formed inside the trunk portion 63 when the valve is opened. In addition, the refrigerant passage can be communicated through the gap S2.

(Second valve body 62)
4-6 (mainly FIG. 6), the 2nd valve body part 62 contains the four guide parts 68 (68a-68d) and the connection part 64 which connects these as a structural part. It is out. The four guide portions 68 (68a to 68d) have an arcuate cross-sectional shape that is bent so as to be positioned on the same circumference, and are provided with a space therebetween in the circumferential direction. (See the gap S in FIG. 5). The number of guide portions 68 (68a to 68d) is not limited to four, and two, three, or five or more guide portions may be provided at equal intervals between each other in the circumferential direction. Further, the intervals between the guide portions need not be equal. The guide portions 68a and 68c (FIG. 5) are arranged so as to face each other across the axis center, and the guide portions 68b and 68d (FIG. 5) are also arranged so as to face each other across the axis center. Yes.

  The connecting portion 64 has an annular shape. The connecting portion 64 is provided inside the four guide portions 68 (68a to 68d) and connects the inner diameter side portions of the four guide portions 68 (68a to 68d). The connecting portion 64 can function as an “engaging piece extending inward in the radial direction”. As described above, the engaging claw 63T extending toward the outer side in the radial direction is provided at the end portion in the axial direction of the body portion 63 (columnar portions 63a to 63d). The first valve body 61 and the second valve body 62 are assembled to each other by engaging the engaging claw 63T with the connecting portion 64 (engaging piece).

  Specifically, the body part 63 (the plurality of columnar parts 63a to 63d) of the first valve body part 61 is inserted inside the connection part 64 (engagement piece). At the time of insertion, the tip portions of the plurality of columnar portions 63a to 63d are bent toward the inner diameter side with the annular portion 69 as a starting point of elastic deformation as the engaging claw 63T gets over the inner wall of the connecting portion 64 (engaging piece). Mu The plurality of columnar parts 63a to 63d are arranged inside the connecting part 64 (engaging piece) by the engagement claw 63T getting over the inner wall of the connecting part 64 (engaging piece). The first valve body 61 and the second valve body 62 are assembled to each other by engaging the engaging claw 63T with the connecting portion 64 (engaging piece). You may join the location where the engaging nail | claw 63T and the connection part 64 are engaging by an adhesive agent, welding (ultrasonic welding etc.), or riveting. By joining the first valve body portion 61 and the second valve body portion 62 to each other, the first valve body portion 61 and the second valve body portion 62 are separated even when a high load is applied to the valve body 60. Can be prevented.

  A spring receiving portion 66 is formed on the downstream surface of the connecting portion 64. In the state where the valve body 60 (the first valve body portion 61 and the second valve body portion 62) is assembled to the valve seat member 50 and integrated as the check valve 40, the four guide portions 68 and the second valve body portion. The spring receiving portion 66 of 62 is disposed on the upstream side of the valve hole 54. The four guide parts 68 are arranged on the outer side in the radial direction of the body part 63. The coil spring 70 is provided so as to surround the periphery of the body portion 63 of the first valve body portion 61, and is disposed between the valve seat member 50 (spring receiving surface 52 </ b> U) and the spring receiving portion 66.

  The upper end of the coil spring 70 is in contact with the spring receiving portion 66. In a state where the first valve body portion 61 and the second valve body portion 62 are assembled to each other and integrated as the valve body 60, the spring receiving portion 66 of the second valve body portion 62 is connected to the first valve body portion 61. It arrange | positions so that it may extend toward the radial direction outer side from the trunk | drum 63 (refer FIG. 4). The four guide portions 68 (68a to 68d) are located on the radially outer side of the spring receiving portion 66. In the present embodiment, the inner peripheral surface 68U (FIG. 6) of each of the four guide portions 68 is located on the radially outer side of the coil spring 70 and restricts the movement of the coil spring 70 in the radial direction. That is, even if a radial clearance is provided between the body portion 63 and the guide portion 68, the guide portion 68 of the valve body 60 in the present embodiment regulates the movement of the coil spring 70 in the radial direction. Thus, stable reciprocation of the valve body 60 can be realized. By suppressing the displacement of the coil spring 70, the coil spring 70 can be expanded and contracted stably, and the valve body 60 can be stably moved. Even when a sudden pressure fluctuation occurs, the coil spring 70 is hardly displaced radially outward, and the behavior of the coil spring 70 is hardly unstable.

  In the present embodiment, the outer peripheral surface 68S (FIGS. 4 and 6) of each of the four guide portions 68 has a size and a shape capable of sliding contact with the inner wall surface of the suction port 22 (refrigerant passage). (See FIG. 5). For example, as shown in FIG. 5, the outer peripheral surface 68S is configured to have a curvature radius slightly smaller than the curvature radius of the inner wall surface of the suction port 22 (large diameter portion 22a). That is, the guide portion 68 of the valve body 60 in the present embodiment can achieve stable movement of the valve body 60 by slidingly contacting the inner wall surface of the suction port 22.

  The check valve 40 has a configuration in which the guide portion 68 (inner peripheral surface 68U) can move the valve body 60 stably by restricting the movement of the coil spring 70 in the radial direction, and the guide portion 68 (outer peripheral surface). 68S) is preferably provided with both the configuration in which the valve body 60 can be stably moved by slidingly contacting the inner wall surface of the suction port 22, but only one of them may be provided. .

  In the present embodiment, the outer peripheral surface 63S (FIG. 6) of the body portion 63 of the first valve body portion 61 functions as “another outer peripheral surface” and is in sliding contact with the inner wall of the valve hole 54. The valve body 60 can be stably moved also by the sliding contact. The check valve 40 has both a configuration in which the guide portion 68 (outer peripheral surface 68S) is in sliding contact with the inner wall surface of the suction port 22 and a configuration in which the outer peripheral surface 63S of the trunk portion 63 is in sliding contact with the inner wall of the valve hole 54. Although it is preferable to provide, only either one may be provided. When the check valve 40 has both of these sliding contact configurations, the clearance between the guide portion 68 (outer peripheral surface 68S) and the inner wall surface of the suction port 22, the outer peripheral surface 63S of the trunk portion 63, and the valve The clearance between the inner wall of the hole 54 is preferably set to be substantially the same.

  With reference to FIG. 5, as described above, the guide portion 68 a (first guide portion) and the guide portion 68 b (second guide portion) are arranged in the circumferential direction with respect to the arrangement of the check valve 40 in the suction port 22. The gaps S are provided so as to be spaced apart from each other. The same applies to the guide portions 68b and 68c, the same applies to the guide portions 68c and 68d, and the same applies to the guide portions 68d and 68a.

  In the present embodiment, four gaps S are formed. The four gaps S are formed so as to be arranged in the circumferential direction at an arrangement interval of 90 °. The peripheral wall 51 (regulating surface 51T) of the valve seat member 50 is located downstream (directly below) these four gaps S. In other words, when the check valve 40 disposed in the suction port 22 is viewed along the axial direction (when the check valve 40 is viewed in plan as shown in FIG. 5), the four gaps S Through, the peripheral wall part 51 (regulation surface 51T) of the valve seat member 50 can be visually recognized.

  As described above, in FIG. 5, the end surface of the peripheral wall portion 51 (regulating surface 51 </ b> T) of the valve seat member 50 is illustrated. The peripheral wall portion 51 (regulating surface 51T) of the valve seat member 50 in FIG. 5 does not represent a cross-sectional structure, but is hatched for convenience of explanation. According to the configuration in which the peripheral wall portion 51 (regulating surface 51T) of the valve seat member 50 is positioned downstream (directly below) the four gaps S, even after the check valve 40 is assembled as a finished product. The valve seat member 50 can be pressed into the suction port 22 in the axial direction by using a tool inserted into the gap S.

(Function and effect)
2 and 8, when the rotating shaft 16 rotates, the rotor 18 and the vane 19 rotate, and the refrigerant gas flows into the suction port 22 from the evaporator via the suction pipe 25, the valve body 60 (FIG. The suction pressure of the refrigerant gas acts on the head 65 of 8), and the valve body 60 moves against the urging force of the coil spring 70 in a direction away from the inner peripheral surface of the suction port 22. The head 65 of the valve body 60 is accommodated in the suction port 22 when the check valve 40 is closed, and protrudes from the suction port 22 to the suction chamber 20 (FIG. 2) when the check valve 40 is open. It will be.

  FIG. 9 is a cross-sectional view showing a check valve 40Z in the comparative example. In the check valve 40Z, the valve seat member 50 and the bottomed cylindrical body 80 are arranged in the axial direction. The valve body 60 is accommodated in the body 80, and the valve seat member 50 and the valve body 60 are also arranged in the axial direction. The bottom portion 84 of the body 80 has a function as a stopper that restricts the movement of the valve body 60 and a function as a spring receiving surface that receives the coil spring 70, but due to the presence of the bottom portion 84 of the body 80, It is difficult to shorten the length.

  In addition, among the spaces provided in the shell to allow the check valve 40Z to be disposed, the space SS (outside the bottom of the body 80 when viewed from the valve body 60) is located outside the bottom of the body 80. The space SS) located on the side is mainly provided to accommodate the bottomed cylindrical body 80, and this space SS is hardly utilized as a refrigerant passage. There is also a concern that foreign matter may stay in the space SS. It is necessary to determine the overall arrangement position of the check valve 40Z so that the communication window 82 of the body 80 is not blocked, and the dimensions in the depth direction of the check valve 40Z and the position, size, and shape of the suction chamber 20 are determined. Restrictions are likely to occur.

  In contrast to the check valve 40Z as described above, in the check valve 40 in the present embodiment (see FIG. 8), the valve body 60 and the valve seat member 50 are not aligned in the axial direction. The valve seat member 50 is disposed so as to overlap in the radial direction. According to the said structure, the space in the axial direction required in order to arrange | position the check valve 40 can be made small, and it can arrange | position easily in the suction port 22 which has a cylindrical shape. Since the check valve 40 (head 65) is accommodated in the suction port 22 when the check valve 40 is closed, assembly and disassembly of the compressor 10 as a whole is also possible. Easy.

  In the present embodiment, a space S1 (FIG. 7) is formed inside the plurality of columnar portions 63a to 63d. A gap S2 is formed between the adjacent columnar parts 63a to 63d due to the presence of the gap D. The downstream portion of the space S1 and the downstream portion of the gap S2 are positioned downstream of the valve seat 53 when the valve is opened. Therefore, the space S1 and the gap S2 can function as a flow path through which the refrigerant passes when the valve is opened (see FIG. 8).

  At this time, if the raised portion 67 is formed on the head 65, the raised portion 67 can guide the refrigerant gas flowing near the center of the suction port 22 to the outer peripheral side. The check valve 40 is opened, and the refrigerant gas is sucked into the suction chamber 20 (FIG. 2) through the suction port 22. The valve seat member 50 has a restricting surface 51T, and the maximum stroke amount (the check valve 40 is fully opened) when the lower end surface 68K of the valve body 60 (second valve body portion 62) contacts the restricting surface 51T. Is defined) (see FIG. 8).

  4 and 8, when the valve body 60 is moving in the axial direction, the outer peripheral surface 68S of the guide portion 68 is in sliding contact with the inner wall surface of the suction port 22 at the position of the point P1. It is assumed that the outer peripheral surface 63S is in sliding contact with the inner wall of the valve hole 54 at the position of the point P2. The point P1 is located near the upper end (near the upstream) in the axial direction of the valve body 60, and the point P2 is located near the lower end (near the downstream) in the axial direction of the valve body 60. That is, since the valve body 60 is guided at two locations (points P1 and P2) that are separated when the valve body 60 moves, the valve body 60 can be stably moved (in practice, the valve body 60 is Instead of being guided by a point, the valve body 60 is guided by a region having a certain area).

  Here, the axial distance between the point P1 and the point P2 changes as the valve body 60 moves. For example, the distance is the maximum value L1 (FIG. 4) when the valve is closed, and the minimum value L2 (FIG. 8) when the stroke is maximum. Even if the distance becomes the minimum value L2 (FIG. 8) at the time of the maximum stroke, in the present embodiment, the outer peripheral surface 68S of the guide portion 68 continues to slidably contact the inner wall of the suction port 22 with a predetermined surface area. Therefore, regardless of the position of the valve body 60 in the opening / closing direction, the valve body 60 can move stably without tilting.

  That is, the second valve body portion 62 of the valve body 60 in the present embodiment has a function that the positional deviation in the radial direction of the coil spring 70 can be suppressed by the inner peripheral surface 68U of the guide portion 68, and the outer peripheral surface 68S of the guide portion 68. Is capable of guiding the movement of the valve body 60 by slidingly contacting the inner wall of the suction port 22 and the lower end surface 68K of the guide portion 68 is in contact with the restriction surface 51T of the valve seat member 50 to restrict movement in the opening direction. It also has the function of being able to (can define the maximum stroke amount).

  Further, the valve seat member 50 in the present embodiment has an inner peripheral surface 56 that forms the inner wall of the valve hole 54, and the body 63 of the valve body 60 is inserted into the valve hole 54 of the valve seat member 50. Is done. The inner peripheral surface 56 of the valve seat member 50 (inner wall of the valve hole 54) can slide on the valve body 60 to guide the movement of the valve body 60, and can also function as a refrigerant passage (valve hole). The valve seat member 50 can also restrict movement in the opening direction by the cooperation of the regulating surface 51T and the lower end surface 68K of the valve body 60.

  The refrigerant gas sucked into the suction chamber 20 is sucked into the compression chambers 21 during the suction stroke through the suction ports 23 (FIG. 2). The refrigerant gas sucked into each compression chamber 21 is compressed by the volume reduction of the compression chamber 21 during the compression stroke. The compressed refrigerant gas is discharged from the compression chambers 21 to the discharge chambers 30 through the discharge ports 31.

  The refrigerant gas in each discharge chamber 30 flows out into the case 36a through the communication passage 37 (FIG. 1) and is blown to the outer peripheral surface of the oil separation cylinder 36b, and swirls around the outer peripheral surface of the oil separation cylinder 36b. However, it is guided downward in the case 36a. Centrifugation separates the lubricating oil from the refrigerant gas. The lubricating oil separated from the refrigerant gas moves to the bottom side of the case 36a and is stored at the bottom of the discharge region 35 through the oil passage 36c.

  The lubricating oil stored at the bottom of the discharge region 35 is guided from the oil supply passage 15d to the vane groove 18a, and pushes the vane 19 to the outer peripheral side as back pressure. The compression chamber 21 is partitioned by the vane 19 pushed to the outer peripheral side. The sliding portion between the vane 19 and the vane groove 18a is lubricated by the lubricating oil guided to the vane groove 18a. On the other hand, the refrigerant gas from which the lubricating oil is separated in the oil separator 36 moves upward in the oil separation cylinder 36 b and is discharged to the capacitor via the discharge port 34 and the discharge pipe 39.

  On the other hand, when the rotation of the rotating shaft 16 stops, the rotation of the rotor 18 and the vane 19 stops, and the compression operation of the compressor 10 stops. Then, as shown in FIG. 4, the valve body 60 is biased toward the inner peripheral surface of the suction port 22 by the biasing force of the coil spring 70, and the seal surface 65 </ b> S comes into contact with the valve seat 53. Thereby, the check valve 40 is closed, and the backflow of the refrigerant gas from the compression chamber 21 side toward the suction pipe 25 through the suction chamber 20 and the suction port 22 when the compressor 10 is stopped from being compressed is prevented. .

[Embodiment 2]
FIG. 10 is a cross-sectional view showing a check valve 40A in the second embodiment. In the present embodiment, the peripheral wall portion 51 of the valve seat member 50 is integral with the member forming the inner wall surface of the suction port 22.

  Also with this configuration, the valve body 60 and the valve seat member 50 are not aligned in the axial direction, and the valve body 60 and the valve seat member 50 are disposed so as to overlap in the radial direction. The space in the axial direction necessary for arranging the check valve 40A can be reduced. In the state where the check valve 40A is closed, the structure in which the check valve 40A (head 65) is accommodated in the suction port 22 is employed, so that the compressor can be easily assembled and disassembled as a whole. It is. As in the case of the first embodiment, the space S1 and the gap S2 can function as a flow path through which the refrigerant passes when the valve is opened (see FIG. 8).

  Also in the present embodiment, the second valve body portion 62 of the valve body 60 has a function that the positional deviation in the radial direction of the coil spring 70 can be suppressed by the inner peripheral surface 68U of the guide portion 68, and the outer periphery of the guide portion 68. The function that the movement of the valve body 60 can be guided by the surface 68S slidingly contacting the inner wall of the suction port 22, and the movement in the opening direction by the lower end surface 68K of the guide portion 68 contacting the restriction surface 51T of the valve seat member 50. It has a function that can regulate the maximum stroke amount (the maximum stroke amount can be defined).

  Further, the inner peripheral surface 56 of the valve seat member 50 (inner wall of the valve hole 54) can slide on the valve body 60 to guide the movement of the valve body 60, and can also function as a refrigerant passage (valve hole). Furthermore, the valve seat member 50 can also restrict movement in the opening direction by the cooperation of the regulating surface 51T and the lower end surface 68K of the valve body 60.

[Embodiment 3]
FIG. 11 is a cross-sectional view showing a check valve 40B in the third embodiment. The valve body 60 of the present embodiment has a configuration in which the first valve body portion 61 and the second valve body portion 62 in the above-described first and second embodiments are integrated. When the configuration is adopted, the annular portion 69 that connects the body portion 63 (the plurality of columnar portions 63 a to 63 d) is not provided as shown in FIG. 11 or is provided near the head 65. It is preferable. This is to facilitate assembly to the valve seat member 50. Also in the present embodiment, the body portion 63 (a plurality of columnar portions) is inserted into the valve hole 54 of the valve seat member 50. At the time of insertion, the plurality of columnar portions bend toward the inner diameter side with the base portions of the plurality of columnar portions as starting points of elastic deformation. As the plurality of columnar portions get over the inner wall of the valve hole 54, the plurality of columnar portions are arranged inside the valve hole 54. Also with this configuration, it is possible to obtain substantially the same operations and effects as those described in the above embodiments.

[Embodiment 4]
FIG. 12 is a perspective view showing a first valve body 61C provided in the check valve in the fourth embodiment. The difference between the first valve body portion 61C and the first valve body portion 61 is that the columnar portions 63a and 63b constituting the body portion 63 are not four but two (two) as in the first embodiment. There is a point and a point that the engaging claw 63T is not provided as in the first embodiment. Also with this configuration, the space S1 can function as a flow path through which the refrigerant passes when the valve is opened (see FIG. 8).

[Embodiment 5]
FIG. 13 is a perspective view showing a first valve body portion 61D provided in the check valve in the fifth embodiment. Although the trunk | drum 63 in 1st valve body part 61D also has a columnar shape, the trunk | drum 63 of this Embodiment is the cylinder extended toward the upstream from the head 65 more specifically. It has a shape. A communication window 63H is provided in the cylindrical portion of the body 63, and the space S1 and the communication window 63H formed inside the body 63 serve as a passage through which the refrigerant passes when the valve is opened. Can function.

  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.

  DESCRIPTION OF SYMBOLS 10 Compressor, 11 Housing, 12 Rear housing, 12a Perimeter wall, 13 Front housing, 14 Cylinder block, 14a, 14b Recessed part, 15 Side plate, 15d Oil supply passage, 16 Rotating shaft, 17a Shaft seal device, 18 Rotor, 18a Vane Groove, 19 vane, 20 suction chamber, 21 compression chamber, 22 suction port (refrigerant passage), 22a large diameter portion, 22b medium diameter portion, 22c stepped portion, 22d small diameter portion, 23 suction port, 24, 38 joint portion, 25 Suction pipe, 30 discharge chamber, 31 discharge port, 32 discharge valve, 34 discharge port, 35 discharge area, 36 oil separator, 36a case, 36b oil separation cylinder, 36c oil passage, 37 communication path, 39 discharge pipe, 40, 40A, 40B, 40Z check valve, 50 valve seat member, 51 peripheral wall, 51S inner wall, 1T regulating surface, 52 annular portion, 52U spring receiving surface, 53 valve seat, 54 valve hole, 56, 68U inner circumferential surface, 57, 63S, 68S outer circumferential surface, 60 valve body, 61, 61C, 61D first valve body Part, 62 2nd valve body part, 63 trunk part, 63H, 82 communication window, 63T engaging claw, 63a, 63b, 63d columnar part, 64 connecting part, 65 head, 65S sealing surface, 66 spring receiving part, 67 Bumped portion, 68, 68a, 68b, 68c, 68d Guide portion, 68K lower end surface, 69 annular portion, 69K downstream end, 70 coil spring, 80 body, 84 bottom portion, 141b extended surface, 142b mounting surface, D spacing, L1 maximum Value, L2 minimum value, P1, P2 point, S, S2 gap, S1, SS space.

Claims (3)

A check valve for a compressor, which is provided in a refrigerant passage through which refrigerant passes, and includes a valve seat member having a valve hole and a valve seat, and a valve body that opens and closes the valve hole in contact with the valve seat. There,
The valve body is a body portion that is guided by the valve hole of the valve seat member, and a head portion that is disposed downstream of the valve hole and moves together with the body portion so as to contact and separate from the valve seat, Including
The valve seat member is formed in an annular shape,
An outer peripheral surface of the valve seat member is fixed to an inner wall surface of the refrigerant passage, an inner peripheral surface of the valve seat member forms an inner wall of the valve hole, and one end side of the valve seat member is The valve seat is formed, and the other end side of the valve seat member forms a regulating surface that regulates movement of the valve body in the opening direction.
Compressor check valve. The valve seat member has a peripheral wall portion, and an annular portion having a shape protruding radially inward from the peripheral wall portion,
The upstream surface of the peripheral wall portion forms the regulation surface,
The downstream surface of the annular portion forms the valve seat,
The inner peripheral surface of the annular portion forms the valve hole,
The check valve of the compressor according to claim 1. The annular part is provided so as to protrude radially inward from the downstream end of the peripheral wall part,
A check valve for a compressor according to claim 2.