CN108692070B

CN108692070B - Compressor with a compressor housing having a plurality of compressor blades

Info

Publication number: CN108692070B
Application number: CN201810264896.2A
Authority: CN
Inventors: 米田正人; 出户纪一; 中岛昭治; 小林俊之
Original assignee: Toyoda Automatic Loom Works Ltd
Current assignee: Toyota Industries Corp
Priority date: 2017-03-29
Filing date: 2018-03-28
Publication date: 2019-12-24
Anticipated expiration: 2038-03-28
Also published as: JP6760176B2; CN108692070A; JP2018168729A; KR20180110620A; KR101963214B1

Abstract

The invention provides a compressor. The check valve (40) of the compressor is provided with a valve seat member (50) in which a valve hole (51) is formed, a valve body (70) that opens and closes the valve hole (51), and a stopper (14 s). A pilot member (80) is coupled to the valve body (70) via a coupling portion that allows the relative distance between the pilot member (80) and the valve body (70) to be variable. The pilot member (80) can pass through the valve hole (51), and the pilot member (80) does not protrude in the opposite direction from the valve hole (51) in a state where the valve body (70) is in contact with the stopper (14 s). When the refrigerant flows in the reverse direction, the pilot member (80) receives the pressure from the refrigerant, and the pilot member (80) passes through the valve hole (51) in the reverse direction and pulls the valve body (70) to move the valve body (70) in the reverse direction, and the valve hole (51) is blocked by the differential pressure of the valve body (70) contacting the valve seat member (50).

Description

Compressor with a compressor housing having a plurality of compressor blades

Technical Field

The present invention relates to a compressor.

Background

The compressor is provided with a check valve for preventing the refrigerant from flowing backward. As disclosed in japanese patent laid-open publication nos. 2003-232456 and 53-130519, in general, a check valve includes: the valve includes a valve seat member having a valve hole formed therein, a valve body that opens and closes the valve hole by coming into contact with and separating from the valve seat member, and a spring that biases the valve body in a valve closing direction.

Disclosure of Invention

In the check valve disclosed in japanese patent application laid-open No. 2003-232456, the 1 st and 2 nd valve bodies constitute 1 valve body in a state of being in close contact with each other, and a spring biases the 1 valve body in a valve closing direction. The 1 spool moves against the urging force of the spring so that the valve hole opens. In this publication, it is described that the spring may be omitted depending on the implementation.

If it is assumed that the spring is omitted in the structure of japanese patent application laid-open No. 2003-232456, the valve hole is opened by moving 1 valve element by the pressure of the fluid flowing in the forward direction, and the valve hole is closed by moving 1 valve element in the valve closing direction by the pressure of the fluid flowing in the reverse direction. Since 1 spool has a predetermined weight, it is not always easy to stably move 1 spool as described above by the pressure of the fluid.

The pneumatic automatic valve disclosed in Japanese patent application laid-open No. 53-130519 (Japanese: air is made so) is provided with 2 valve elements that can move independently of each other in order to open and close a fluid passage. One valve element is connected to the piston and biased by a spring. When the piston moves by the supply of the pressurized air, the one valve element moves in the valve opening direction against the biasing force of the spring. The other valve element is moved in the valve opening direction by the fluid flowing through the fluid passage. In the structure of jp 53-130519 a, a spring for biasing the one valve element is required.

When the above-described spring is used for the check valve, the valve body is brought into contact with the valve seat member by the biasing force of the spring, and the valve hole is closed. The spring as described above for closing the valve hole acts as resistance against the valve body moving in the valve opening direction when the valve is opened, and therefore may cause a loss in the kinetic energy of the fluid and/or the pressure of the fluid. In the case where the structure may be adopted without the spring for closing the valve hole as described above, or in the case where the structure may be adopted with a spring smaller than the spring for closing the valve as described above, the resistance acting on the valve body when the valve is opened can be reduced, the check valve can be made smaller and/or lighter in weight, can be provided in a smaller space, and can contribute to the downsizing of the entire compressor, and the like.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a compressor including a check valve having a structure capable of reducing pressure loss and reducing the size of the compressor.

A compressor according to the present invention is a compressor including a check valve that allows a refrigerant to flow in a forward direction toward a compression chamber and restricts the refrigerant from flowing in a reverse direction, the check valve including: a valve seat member having a valve hole through which the refrigerant passes; a valve body disposed on a downstream side of the valve seat member in the forward direction, and configured to open and close the valve hole by coming into contact with and separating from the valve seat member; and a stopper (stopper) that restricts movement of the valve body in an opening/closing direction of the valve body on a side opposite to the valve seat member with respect to the valve body, a pilot member is coupled to the valve element via a coupling portion that allows a relative distance of the pilot member to the valve element in an opening/closing direction of the valve element to be variable, and the pilot member is allowed to pass through the valve hole, the pilot member does not protrude from the valve hole in the opposite direction in a state where the valve body abuts against the stopper, when the refrigerant flows in the reverse direction, the pilot member receives the pressure from the refrigerant, so that the pilot member passes through the valve hole in the opposite direction and pulls the valve body to move the valve body in the opposite direction, the valve hole is closed by a differential pressure through the valve body contacting the valve seat member.

According to the check valve of the compressor, the pilot member is coupled to the valve body such that the relative distance from the valve body in the opening/closing direction of the valve body is variable, and the pilot member is moved by the pressure of the fluid, whereby the pressure loss can be reduced and the size can be reduced without using a spring or using a smaller spring.

The above and other objects, features, aspects and advantages of the present invention will become apparent from the following detailed description of the present invention, which is to be read in connection with the accompanying drawings.

Drawings

Fig. 1 is a sectional view showing a compressor 10 in embodiment 1.

Fig. 2 is a sectional view taken along line II-II in fig. 1.

Fig. 3 is a sectional view taken along the line III-III in fig. 1.

Fig. 4 is a sectional view showing an area surrounded by an IV line in fig. 2 in an enlarged manner, and shows a sectional configuration of the check valve 40.

Fig. 5 is a sectional perspective view showing an exploded state of the check valve 40 in embodiment 1.

Fig. 6 is a cross-sectional view showing a state in which the refrigerant flows in the forward direction in the check valve 40 of embodiment 1.

Fig. 7 is a cross-sectional view showing a state where the refrigerant starts to flow in the reverse direction in the check valve 40 of embodiment 1.

Fig. 8 is a cross-sectional view showing a state in which the pilot member 80 is moved by the refrigerant flowing in the reverse direction in the check valve 40 of embodiment 1.

Fig. 9 is a cross-sectional view showing a state in which the valve hole 51 is closed by the valve body 70 in the check valve 40 of embodiment 1.

Fig. 10 is a sectional view showing a check valve 40Z in the comparative example.

Fig. 11 is a sectional perspective view showing a check valve 40A in a modification of embodiment 1.

Fig. 12 is a sectional view showing a check valve 40B in embodiment 2.

Fig. 13 is a cross-sectional view showing a state where the refrigerant starts to flow in the reverse direction in the check valve 40B of embodiment 2.

Fig. 14 is a cross-sectional view showing a state in which the pilot member 80 is moved by the refrigerant flowing in the reverse direction in the check valve 40B of embodiment 2.

Fig. 15 is a cross-sectional view showing a state in which the valve hole 51 is closed by the valve body 70 in the check valve 40B of embodiment 2.

Fig. 16 is a sectional view showing a check valve 40C in embodiment 3.

Fig. 17 is a cross-sectional view showing a state where the refrigerant starts to flow in the reverse direction in the check valve 40C of embodiment 3.

Fig. 18 is a cross-sectional view showing a state in which the pilot member 80 is moved by the refrigerant flowing in the reverse direction in the check valve 40C according to embodiment 3.

Fig. 19 is a cross-sectional view showing a state in which the flat plate 67 is moved by the refrigerant flowing in the reverse direction in the check valve 40C of embodiment 3.

Fig. 20 is a cross-sectional view showing a state in which the valve hole 51 is closed by the valve body 70 in the check valve 40C according to embodiment 3.

Fig. 21 is a sectional view showing a check valve 40D in embodiment 4.

Fig. 22 is a cross-sectional view showing a state in which the refrigerant flows in the forward direction in the check valve 40D according to embodiment 4.

Fig. 23 is a cross-sectional view showing a state in which the refrigerant flows in the reverse direction and the pilot member 80 moves by the refrigerant flowing in the reverse direction in the check valve 40D according to embodiment 4.

Fig. 24 is a cross-sectional view showing a state in which the valve hole 51 is closed by the valve body 70 in the check valve 40D according to embodiment 4.

Fig. 25 is a sectional view showing a check valve 40E in embodiment 5.

Fig. 26 is a cross-sectional view showing a state in which the refrigerant flows in the forward direction in the check valve 40E of embodiment 5.

Fig. 27 is a cross-sectional view showing a state in which the refrigerant flows in the reverse direction and the pilot member 80 moves by the refrigerant flowing in the reverse direction in the check valve 40E of embodiment 5.

Fig. 28 is a cross-sectional view showing a state in which the valve hole 51 is closed by the valve body 70 in the check valve 40E according to embodiment 5.

Fig. 29 is a sectional view showing a check valve 40F in embodiment 6.

Fig. 30 is a cross-sectional view showing a state in which the refrigerant flows in the reverse direction and the pilot member 80 moves by the refrigerant flowing in the reverse direction in the check valve 40F of embodiment 6.

Fig. 31 is a cross-sectional view showing a state in which the valve hole 51 is closed by the valve body 70 in the check valve 40F according to embodiment 6.

Fig. 32 is a sectional view showing a check valve 40G in embodiment 7.

Detailed Description

The embodiments are described below with reference to the drawings. The same reference numerals are given to the same and corresponding members, and repetitive description may not be repeated.

[ embodiment 1]

(compressor 10)

Fig. 1 is a sectional view showing a compressor 10 in embodiment 1. Fig. 2 is a sectional view taken along line II-II in fig. 1. Fig. 3 is a sectional view taken along the line III-III in fig. 1. The compressor 10 is mounted on a vehicle, for example, and is used for an air conditioner of the vehicle. The compressor 10 is a vane (english: vane) type compressor, but the following concepts can be applied to scroll (english: scroll) type, swash plate type, and Roots (english: Roots) type compressors.

As shown in fig. 1, the compressor 10 includes a housing 11 and a check valve 40. The housing 11 includes a rear housing 12 and a front housing 13 as its constituent elements, and has a suction chamber 20 formed therein. The rear case 12 has a peripheral wall 12a (see fig. 2 and 3). The front housing 13 has a cylinder 14. The cylinder 14 is integrated with the front housing 13 and housed in the rear housing 12. The side plate 15 is coupled to the cylinder 14.

A rotor 18 is provided inside the cylinder 14. A plurality of grooves 18a are provided on the outer peripheral surface of the rotor 18 (fig. 2 and 3). Blades 19 are housed inside the grooves 18a so as to be able to enter and exit. The rotor 18 rotates with the rotation of the rotary shaft 16. A compression chamber 21 is defined between the outer peripheral surface of the rotor 18, the inner wall of the cylinder 14, the adjacent pair of vanes 19, the front housing 13 (fig. 1), and the side plate 15 (fig. 1).

A recess 14a is formed in the outer peripheral surface of the cylinder 14 over the entire circumference of the cylinder 14 in the circumferential direction (see fig. 2). The suction chamber 20 is formed by a recess 14a provided in the cylinder 14 and the inner circumferential surface of the rear housing 12. The suction chamber 20 is formed between the cylinder 14 (the recess 14a) and the rear housing 12 (the peripheral wall 12 a). A suction port (japanese: suction ポート)22 provided in the housing 11 (rear housing 12) forms a refrigerant passage through which refrigerant passes, and communicates with the suction chamber 20. As will be described in detail later, the suction port 22 is provided with a check valve 40 that prevents a refrigerant from flowing backward from the suction chamber 20 to the suction port 22.

The cylinder 14 is formed with a pair of suction ports 23 (fig. 2) communicating with the suction chamber 20. In the suction stroke, the compression chamber 21 and the suction chamber 20 communicate with each other through the suction port 23. A pair of recesses 14b (fig. 1 and 3) are also provided on the outer peripheral surface of the cylinder 14. The discharge chamber 30 is partitioned by the concave portion 14b and the inner peripheral surface of the rear housing 12 (peripheral wall 12 a). The cylinder 14 is formed with a discharge port 31 (fig. 3) that communicates the compression chamber 21 with the discharge chamber 30. The discharge port 31 is opened and closed by a discharge valve 32. The refrigerant gas compressed in the compression chamber 21 pushes open 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 (japanese patent: discharge ポート)34 is formed in the peripheral wall 12a of the rear housing 12. A condenser of an external refrigerant circuit, not shown, is connected to the discharge port 34. On the rear side of the rear case 12, a discharge area 35 (fig. 1) is partitioned by the side plate 15. An oil separator 36 is disposed in the discharge region 35.

A communication passage 37 (fig. 1 and 3) is formed between the side plate 15 and the oil separator 36. The communication passage 37 communicates the discharge chamber 30 with the oil separator 36. The side plate 15 is formed with an oil supply passage 15d (fig. 1). The oil supply passage 15d guides the lubricating oil stored in the bottom portion of the discharge region 35 to the groove 18a (vane groove).

(check valve 40)

Referring to fig. 1 and 2, the suction port 22 is provided so as to penetrate through a peripheral wall 12a of a rear housing 12 (cover), and a cylindrical joint portion 24 is provided continuously outside the suction port 22. A suction pipe 25 is connected to the joint 24. The refrigerant (refrigerant gas) flows from an unillustrated evaporator into the suction port 22 through the suction pipe 25. The suction port 22 forms a refrigerant passage through which refrigerant passes. A check valve 40 is provided in the suction port 22.

Fig. 4 is a sectional view showing an area surrounded by an IV line in fig. 2 in an enlarged manner, and shows a sectional configuration of the check valve 40. Fig. 5 is a sectional perspective view showing an exploded state of the check valve 40. As shown in fig. 4 and 5, the check valve 40 includes a seat member 50, a valve body 70, and a stopper 14 s. As described in detail below, the check valve 40 is disposed inside the compressor 10, and allows the refrigerant to flow in the forward direction toward the compression chambers 21 (see fig. 6) and restricts the refrigerant from flowing in the reverse direction (see fig. 9).

(valve seat member 50)

The valve seat member 50 of the check valve 40 has a hollow annular shape as a whole and is provided in the suction port 22. The valve seat member 50 has a valve hole 51 formed therein through which a refrigerant passes. The valve seat member 50 is a member provided separately from the member forming the inner wall surface of the suction port 22 (the rear housing 12 in the present embodiment), and is fixed to the inner wall surface of the suction port 22 by press fitting.

The valve seat 52 is formed on an end surface of the valve seat member 50 on the downstream side in the positive direction of the valve hole 51 (in other words, an end surface of the valve hole 51 on the downstream side in the positive direction when the refrigerant flows in the positive direction). The valve seat 52 of the present embodiment is formed so as to be located in a plane perpendicular to the axial direction of the suction port 22. The valve seat 52 is in contact with a sealing surface 75 of the valve body 70 described later.

(valve core 70)

The valve body 70 of the check valve 40 is disposed on the downstream side of the valve seat member 50 in the positive direction (in other words, on the downstream side of the valve seat member 50 in the positive direction when the refrigerant flows in the positive direction). The valve body 70 opens and closes the valve hole 51 by coming into contact with and separating from the seat member 50. A pilot member 80 whose relative distance from the valve element 70 in the opening/closing direction of the valve element 70 is variable is connected to the valve element 70. In the present embodiment, the valve body 70 and the pilot member 80 are both disposed in the suction chamber 20 so as to be movable relative to each other.

(Pilot parts 80)

The pilot member 80 includes a 1 st plate-like portion 81, a shaft portion 82, and a bottom portion 83. The 1 st plate-like portion 81 has a substantially disk-like shape. The 1 st plate-like portion 81 is disposed at a position closest to the valve hole 51 among the valve body 70 and the pilot member 80 when the refrigerant flows in the forward direction. The surface of the 1 st plate-like portion 81 on the side where the seat member 50 is located has a spherical shape, and the center portion of the surface bulges toward the side where the seat member 50 is located. A surface 85 of the 1 st plate-like portion 81 on the side opposite to the side where the valve seat member 50 is located is flat in surface shape.

The shaft portion 82 has a cylindrical shape. The shaft portion 82 is provided upright at a portion of the 1 st plate-like portion 81 on the side opposite to the side where the valve hole 51 (valve seat member 50) is located. The bottom portion 83 has a plate-like shape, and the outer peripheral edge of the bottom portion 83 has a circular shape. The shaft portion 82 is provided at a central portion of the bottom portion 83. The surface of the bottom portion 83 on the side where the valve seat member 50 is located forms the 1 st locking portion 84 and has a flat surface shape.

In the present embodiment, the shaft portion 82 and the bottom portion 83 are integrally formed with each other by resin molding or the like. In a state where the shaft portion 82 is inserted into the insertion hole 71 described later, the 1 st plate-like portion 81 is joined to the tip end of the shaft portion 82. The shaft portion 82 and the 1 st plate-like portion 81 are joined to each other by, for example, a screw stopper and/or an adhesive. In the present embodiment, the length of the shaft portion 82 is longer than the thickness of the 2 nd plate-like portion 72 described later, and with this configuration, the valve body 70 and the pilot member 80 are coupled to each other so that the relative distance therebetween in the opening and closing direction of the valve body 70 is variable. That is, the shaft portion 82 and the bottom portion 83 can function as a connecting portion.

Not limited to the above configuration, the 1 st plate-like portion 81 and the shaft portion 82 may be integrally formed with each other, and the bottom portion 83 may be joined to the distal end of the shaft portion 82 in a state where the shaft portion 82 is inserted into the insertion hole 71. Not limited to this configuration, the 1 st plate-like portion 81, the shaft portion 82, and the bottom portion 83 may all be made as separate members.

The valve body 70 has a 2 nd plate-like portion 72 and a cylindrical portion 73. The 2 nd plate-like portion 72 has a disk-like shape, and an insertion hole 71 is formed in the center of the 2 nd plate-like portion 72. The 2 nd plate-like portion 72 has a surface on the side where the valve seat member 50 is located forming a sealing surface 75, and the 2 nd plate-like portion 72 has a surface on the side opposite to the side where the valve seat member 50 is located forming a 2 nd locking portion 74. The cylindrical portion 73 is provided in an outer peripheral portion of the 2 nd plate-like portion 72 on the side opposite to the side where the valve hole 51 (valve seat member 50) is located, and has a hollow shape.

(stop 14s)

As shown in fig. 4 and 5, a stopper 14s is provided on the opposite side of the valve seat member 50 from the valve body 70. The stopper 14s of the present embodiment is formed by a part of the surface of the cylinder 14 (the recess 14 a). The part of the cylinder 14 (the recess 14a) functions as one of the components of the check valve 40, but the stopper 14s may be a member provided separately from the cylinder 14. The stopper 14s abuts on the valve body 70 to restrict the movement of the valve body 70 in the opening and closing directions. The check valve 40 may further include a cylindrical body 62 (guide portion). The cylindrical body 62 is fixed to the surface of the cylinder 14 (the recess 14 a). The inner peripheral surface of the cylindrical body 62 is in sliding contact with the outer peripheral surface of the valve body 70, whereby the cylindrical body 62 guides the movement (described in detail later) of the valve body 70. By providing such a cylindrical body 62, the valve body 70 can be moved more stably.

Referring to fig. 4, in the present embodiment, the diameter D51 of the valve hole 51 is larger than the diameter D81 of the outer peripheral edge of the 1 st plate-like portion 81 and smaller than the diameter D75 of the sealing surface 75. Therefore, the 1 st plate portion 81 of the pilot member 80 can be disposed inside the valve hole 51 and can pass through the valve hole 51. On the other hand, the sealing surface 75 of the valve body 70 can block the valve hole 51 by coming into contact with the valve seat 52.

(Positive direction)

As shown in fig. 6, when the refrigerant flows in the forward direction (arrow AR1), the valve body 70 and the pilot member 80 receive the pressure from the refrigerant and move in a direction to open the valve hole 51 (in other words, the valve body 70 and the pilot member 80 are disposed at positions away from the valve hole 51). In a state where the refrigerant flows in the forward direction, a gap S is formed between the 1 st plate-like portion 81 and the 2 nd plate-like portion 72.

The 1 st locking portion 84 formed in the bottom portion 83 of the pilot member 80 and the 2 nd locking portion 74 formed in the 2 nd plate-like portion 72 of the spool 70 are separated from each other. The bottom portion 83 of the pilot member 80 and the cylindrical portion 73 of the spool 70 abut against the stopper 14 s. In a state where the valve body 70 is in contact with the stopper 14s, the pilot member 80 is disposed on the suction chamber 20 side with respect to the valve hole 51 and does not protrude in the reverse direction from the valve hole 51.

Refrigerant from an unillustrated evaporator enters the suction chamber 20 through the valve hole 51. The surface of the 1 st plate-like portion 81 on the valve seat member 50 side has a spherical shape, and therefore the refrigerant can efficiently enter the suction chamber 20 from the suction port 22 with less pressure loss.

(reverse direction)

As shown in fig. 7, when the refrigerant flows in the reverse direction (arrow AR2), the pilot member 80 receives pressure (fluid pressure) from the refrigerant. This pressure acts as a negative pressure to move the pilot member 80 toward the side where the valve hole 51 is located. The refrigerant enters the gap S between the 1 st plate-like portion 81 and the 2 nd plate-like portion 72, and the pilot member 80 can receive pressure from the refrigerant efficiently.

As shown in fig. 8, the pilot member 80 moves in the reverse direction (in other words, the downstream side in the reverse direction when the refrigerant flows in the reverse direction) by the pressure of the refrigerant. As the pilot member 80 approaches the valve seat member 50 (valve hole 51), the passage cross-sectional area through which the refrigerant in the valve hole 51 can pass becomes gradually smaller as the pilot member 80 approaches.

The pilot member 80 enters the valve hole 51 so that the pilot member 80 partially blocks the valve hole 51. The cross-sectional area of the passage through which the refrigerant can pass in the valve hole 51 is further reduced, so that the flow velocity of the refrigerant flowing near the pilot member 80 is increased, and a larger force to move the pilot member 80 to the downstream side acts on the pilot member 80.

When the bottom portion 83 of the pilot member 80 contacts the 2 nd plate-like portion 72 of the valve body 70, the 1 st locking portion 84 and the 2 nd locking portion 74 are locked to each other. By the 1 st locking portion 84 and the 2 nd locking portion 74 being locked to each other, a force generated in association with the movement of the pilot member 80 is applied to the valve body 70 through the locking portion.

In a state where the 1 st locking portion 84 and the 2 nd locking portion 74 are locked to each other, the valve body 70 is pulled by the pilot member 80 and moves in the reverse direction (downstream side in the reverse direction when the refrigerant flows in the reverse direction). In the present embodiment, the valve body 70 can more stably approach and move toward the seat member 50 by the tubular body 62.

As shown in fig. 9, the pilot member 80 passes through the valve hole 51 in the reverse direction, and pulls the spool 70 to move the spool 70 further in the reverse direction. In a state where the seal surface 75 of the valve body 70 is in contact with the valve seat 52 of the valve seat member 50, the valve hole 51 is closed by a differential pressure via the valve body 70 in contact with the valve seat member 50. In the closed state, the pressure in the space on the suction chamber 20 side with respect to the suction port 22 is higher than the pressure in the space on the joint 24 side with respect to the suction port 22. Due to this differential pressure, the spool 70 is continuously pressed against the valve seat 52, and the pilot member 80 (bottom portion 83) is continuously pressed against the 2 nd plate-like portion 72 of the spool 70.

The valve hole 51 is closed by the valve body 70, and the insertion hole 71 of the valve body 70 is closed by the bottom portion 83 of the pilot member 80. The refrigerant may be restricted from flowing in the reverse direction (arrow AR 3).

Comparative example

Fig. 10 is a sectional view showing a check valve 40Z in the comparative example. The check valve 40Z includes a seat member 50, a valve body 70, a housing 90, and a spring 98. The housing 90 has a cylindrical portion 91 and a bottom portion 92. A communication hole 91H is formed in the cylindrical portion 91, and the upper end of the cylindrical portion 91 is connected to the lower end of the valve seat member 50.

The valve body 70 and the spring 98 are housed inside the case 90, and the spring 98 biases the valve body 70 in the valve closing direction. The valve element 70, which receives the pressure from the refrigerant flowing in the forward direction, moves against the biasing force of the spring 98. The valve body 70 is separated from the valve seat 52, the valve hole 51 is opened, and the refrigerant flows to the downstream side of the suction chamber 20 and the like through the valve hole 51 and the communication hole 91H.

The spring 98 provided in the check valve 40Z acts not only in a direction of narrowing the passage cross-sectional area through which the refrigerant flowing in the forward direction (arrow AR1) can pass when the valve is opened, but also causes a pressure loss of the refrigerant to a small extent. If the spring 98 is omitted in the structure of the check valve 40Z, the valve body 70 is moved by the pressure of the refrigerant flowing in the forward direction to open the valve hole 51, and the valve body 70 is moved in the valve closing direction by the pressure of the refrigerant flowing in the reverse direction to close the valve hole 51. Since the valve body 70 has a predetermined weight, it is not always easy to stably move the valve body 70 by the pressure of the refrigerant.

(action and Effect of embodiment 1)

In the check valve 40Z of the comparative example (fig. 10), the valve body 70 is composed of 1 member. In contrast, in the check valve 40 according to embodiment 1, the pilot member 80 whose relative distance from the valve body 70 in the opening/closing direction of the valve body 70 is variable is connected to the valve body 70.

The check valve 40 is not provided with a spring acting in a direction to narrow the cross-sectional area of the passage through which the refrigerant flows when the valve is opened, and the pressure loss of the refrigerant is less likely to occur than in the case of the comparative example. The check valve 40 can be configured to be lighter and smaller, and can contribute to downsizing of the entire compressor 10, for example, by not providing a spring for biasing the valve body 70 in the valve closing direction (for example, between the valve body 70 and the cylinder 14).

Focusing on the operation of shifting from the valve-open state to the valve-closed state, when the spring 98 is omitted in the check valve 40Z of the comparative example, the 1 valve element 70 performs the operation of starting to move toward the valve hole 51 upon receiving the pressure of the refrigerant and the operation of contacting the valve seat 52 to close the valve hole 51.

On the other hand, in the check valve 40 according to embodiment 1, the pilot member 80 performs an operation of starting movement toward the valve hole 51 upon receiving the pressure of the refrigerant, and the valve body 70 moves along with the movement of the pilot member 80, and the valve body 70 performs an operation of contacting the valve seat 52 to close the valve hole 51. In the check valve 40 according to embodiment 1, the valve body 70 and the pilot member 80 can be easily moved from the valve-open position to the valve-closed position by the pressure of the refrigerant, and the valve hole 51 can be stably opened and closed by the cooperation of the pilot member 80 and the valve body 70 without using a spring.

In the check valve 40 according to embodiment 1, the pilot member 80 does not perform an operation of actually closing the valve hole 51, and therefore the pilot member 80 may be configured to have a function of receiving the pressure of the refrigerant and starting to move toward the valve hole 51. Therefore, the pilot member 80 is easily configured to be lighter than in the case of the valve body 70 of the comparative example, and for example, the pilot member 80 may be lighter than the valve body 70.

[ modification of embodiment 1]

Fig. 11 is a sectional perspective view showing a check valve 40A in a modification of embodiment 1. The check valve 40 in embodiment 1 differs from the check valve 40A in this modification in the following respects.

The check valve 40A includes a housing 61. The housing 61 has a cylindrical portion 62A and a bottom portion 62B. A communication hole 62H is formed in the cylindrical portion 62A, and the upper end of the cylindrical portion 62A is connected to the lower end of the seat member 50. The inner surface of the bottom portion 62B constitutes a stopper 14 s. With this configuration, the check valve 40A in which the valve seat member 50, the valve body 70, and the stopper 14s are assembled as 1 unit can be obtained. The inner peripheral surface of the cylindrical portion 62A is in sliding contact with the outer peripheral surface of the valve body 70, whereby the cylindrical portion 62A can also function as a guide portion for guiding the movement of the valve body 70.

[ embodiment 2]

Fig. 12 is a sectional view showing a check valve 40B in embodiment 2. The check valve 40 in embodiment 1 is different from the check valve 40B in embodiment 2 in the following points.

The valve body 70 of the check valve 40B has a seal surface 75 and a recessed portion 76, and a pilot member 80 is coupled to the valve body 70 via a coupling portion 64. The pilot member 80 has a spherical shape, but may have a flat plate shape (including a disk shape). The pilot member 80 has a diameter smaller than that of the valve hole 51. The links 64 may be comprised of a rope and/or chain. The material of the coupling portion 64 may be resin or metal. The valve body 70 and the pilot member 80 are coupled to each other via a coupling portion 64. The pilot member 80 is constructed to be sufficiently lighter than the spool 70.

(Positive direction)

As shown in fig. 12, when the refrigerant flows in the forward direction (arrow AR1), the valve body 70, the coupling portion 64, and the pilot member 80 receive the pressure from the refrigerant and move in a direction to open the valve hole 51 (in other words, the valve body 70, the coupling portion 64, and the pilot member 80 are disposed at positions away from the valve hole 51). In a state where the valve body 70 is in contact with the stopper 14s, the pilot member 80 is disposed on the suction chamber 20 side with respect to the valve hole 51 and does not protrude in the reverse direction from the valve hole 51. Refrigerant from an unillustrated evaporator enters the suction chamber 20 through the valve hole 51.

(reverse direction)

As shown in fig. 13, when the refrigerant flows in the reverse direction (arrow AR2), the pilot member 80 receives pressure (fluid pressure) from the refrigerant. This pressure acts as a negative pressure to move the pilot member 80 toward the side where the valve hole 51 is located.

As shown in fig. 14, the pilot member 80 moves in the reverse direction (in other words, the downstream side in the reverse direction when the refrigerant flows in the reverse direction) by the pressure of the refrigerant. As the pilot member 80 approaches the valve seat member 50 (valve hole 51), the passage cross-sectional area through which the refrigerant in the valve hole 51 can pass becomes gradually smaller as the pilot member 80 approaches.

The pilot member 80 enters the valve hole 51 so that the pilot member 80 partially blocks the valve hole 51. The cross-sectional area of the passage through which the refrigerant can pass in the valve hole 51 is further reduced, so that the flow velocity of the refrigerant flowing near the pilot member 80 is increased, and a larger force to move the pilot member 80 to the downstream side acts on the pilot member 80. The force generated in association with the movement of the pilot member 80 is applied to the valve body 70 via the connection portion 64. The valve body 70 is pulled by the pilot member 80 (the connection portion 64) and moves in the reverse direction (the downstream side in the reverse direction when the refrigerant flows in the reverse direction).

As shown in fig. 15, the pilot member 80 passes through the valve hole 51 in the reverse direction, and pulls the spool 70 to move the spool 70 further in the reverse direction. At this time, the cylindrical body 62 may be configured to be long so that the valve body 70 is guided by the cylindrical body 62, or, as shown in fig. 15, the outer peripheral surface of the valve body 70 may be configured to be guided by the inner surface of the suction port 22 after the valve body 70 is separated from the cylindrical body 62. The valve body 70 may be configured to be always guided by either the cylindrical body 62 or the inner surface of the suction port 22. In a state where the seal surface 75 of the valve body 70 is in contact with the valve seat 52 of the valve seat member 50, the valve hole 51 is closed by a differential pressure via the valve body 70 in contact with the valve seat member 50. The refrigerant may be restricted from flowing in the reverse direction (arrow AR 3).

(action and Effect of embodiment 2)

In the check valve 40B according to embodiment 2, a pilot member 80 whose relative distance from the valve body 70 in the opening/closing direction of the valve body 70 is variable is connected to the valve body 70. The check valve 40B is not provided with a spring acting in a direction to narrow the cross-sectional area of the passage through which the refrigerant flows when the valve is opened, and the pressure loss of the refrigerant is less likely to occur than in the case of the comparative example. The check valve 40B can be configured to be lighter and smaller, and can contribute to downsizing of the entire compressor 10, for example, by not providing a spring for biasing the valve body 70 in the valve closing direction (for example, between the valve body 70 and the cylinder 14).

Also in the check valve 40B according to embodiment 2, the pilot member 80 performs an operation of receiving the pressure of the refrigerant and starting to move toward the valve hole 51, and the valve body 70 moves along with the movement of the pilot member 80, and the valve body 70 performs an operation of contacting the valve seat 52 to close the valve hole 51. Also in the check valve 40B according to embodiment 2, the valve body 70 and the pilot member 80 can be easily moved from the valve-open position to the valve-closed position by the pressure of the refrigerant, and the valve hole 51 can be stably opened and closed by the cooperation of the pilot member 80 and the valve body 70 without using a spring.

[ embodiment 3]

Fig. 16 is a sectional view showing a check valve 40C in embodiment 3. The check valve 40B in embodiment 2 differs from the check valve 40C in embodiment 3 in the following points.

The coupling portion 64 of the present embodiment includes a 1 st coupling element 65, a 2 nd coupling element 66, and a flat plate 67. The 1 st and 2 nd coupling elements 65 and 66 may be formed of a string and/or a chain, and a resin or a metal may be used as a material. The flat plate 67 has a disc shape and is provided between the 1 st connecting element 65 and the 2 nd connecting element 66. The outer diameter of the plate 67 is smaller than the diameter of the valve bore 51.

(Positive direction)

As shown in fig. 16, when the refrigerant flows in the forward direction (arrow AR1), the valve body 70, the coupling portion 64, and the pilot member 80 receive the pressure from the refrigerant and move in a direction to open the valve hole 51 (in other words, the valve body 70, the coupling portion 64, and the pilot member 80 are disposed at positions away from the valve hole 51). In a state where the valve body 70 is in contact with the stopper 14s, the pilot member 80 is disposed on the suction chamber 20 side with respect to the valve hole 51 and does not protrude in the reverse direction from the valve hole 51. Refrigerant from an unillustrated evaporator enters the suction chamber 20 through the valve hole 51.

(reverse direction)

As shown in fig. 17, when the refrigerant flows in the reverse direction (arrow AR2), the pilot member 80 receives pressure (fluid pressure) from the refrigerant. This pressure acts as a negative pressure to move the pilot member 80 toward the side where the valve hole 51 is located.

As shown in fig. 18, the pilot member 80 moves in the reverse direction (in other words, the downstream side in the reverse direction when the refrigerant flows in the reverse direction) by the pressure of the refrigerant. As the pilot member 80 approaches the valve seat member 50 (valve hole 51), the passage cross-sectional area through which the refrigerant in the valve hole 51 can pass becomes gradually smaller as the pilot member 80 approaches.

The force generated in association with the movement of the pilot member 80 is applied to the flat plate 67 via the 1 st coupling element 65. The flat plate 67 is pulled by the pilot member 80 (the 1 st coupling element 65) and moves in the reverse direction (the downstream side in the reverse direction when the refrigerant flows in the reverse direction). As the flat plate 67 approaches the valve seat member 50 (valve hole 51), the passage cross-sectional area through which the refrigerant in the valve hole 51 can pass becomes gradually smaller due to the approach of the pilot member 80.

As shown in fig. 19, the force generated with the movement of the plate 67 is applied to the valve body 70 via the 2 nd coupling element 66. The pilot member 80 passes through the valve hole 51 in the reverse direction, and pulls the plate 67 to move the plate 67 further in the reverse direction. The valve body 70 is pulled by the flat plate 67 (the 2 nd coupling element 66) and moves toward the downstream side in the reverse direction (the downstream side in the reverse direction when the refrigerant flows in the reverse direction).

As shown in fig. 20, in a state where the sealing surface 75 of the valve body 70 is in contact with the valve seat 52 of the valve seat member 50, the valve hole 51 is closed by a differential pressure via the valve body 70 in contact with the valve seat member 50. The refrigerant may be restricted from flowing in the reverse direction (arrow AR 3).

(action and Effect of embodiment 3)

In the check valve 40C according to embodiment 3, a pilot member 80 whose relative distance from the valve body 70 in the opening/closing direction of the valve body 70 is variable is connected to the valve body 70. The check valve 40C is not provided with a spring acting in a direction to narrow the cross-sectional area of the passage through which the refrigerant flows when the valve is opened, and the pressure loss of the refrigerant is less likely to occur than in the case of the comparative example. The check valve 40C can be configured to be lighter and smaller, and can contribute to downsizing of the entire compressor 10, for example, by not providing a spring for biasing the valve body 70 in the valve closing direction (for example, between the valve body 70 and the cylinder 14).

In the check valve 40C according to embodiment 3, the pilot member 80 performs an operation of receiving the pressure of the refrigerant to start moving toward the valve hole 51, the flat plate 67 performs an operation of receiving the pressure of the refrigerant to start moving toward the valve hole 51, and thereafter, the valve body 70 performs an operation of contacting the valve seat 52 to close the valve hole 51. Also in the check valve 40C according to embodiment 3, the valve body 70 and the pilot member 80 can be easily moved from the valve-open position to the valve-closed position by the pressure of the refrigerant, and the valve hole 51 can be stably opened and closed by the cooperation of the pilot member 80, the flat plate 67, and the valve body 70 without using a spring. The coupling portion 64 is composed of 3 members including a flat plate 67. For example, the pilot member 80, the plate 67, and the valve body 70 may be stacked in this order.

[ embodiment 4]

Fig. 21 is a sectional view showing a check valve 40D in embodiment 4. The check valve 40B in embodiment 2 is different from the check valve 40D in embodiment 4 in the following points.

The valve body 70 of the check valve 40D has a seal surface 75, and a pilot member 80 is coupled to the valve body 70 via a coupling portion 64. The pilot member 80 has a hollow tapered shape (here, a cone with its bottom surface side open). The coupling portion 64 may be formed of a rod and/or a flat plate. The material of the coupling portion 64 may be resin or metal.

(Positive direction)

As shown in fig. 22, when the refrigerant flows in the forward direction (arrow AR1), the pilot member 80 receives the pressure from the refrigerant, the coupling portion 64 receives the pressing force from the pilot member 80 and bends toward the downstream side, and the valve body 70, the coupling portion 64, and the pilot member 80 receive the pressure from the refrigerant as a whole and move in a direction to open the valve hole 51 (in other words, the valve body 70, the coupling portion 64, and the pilot member 80 are disposed at positions where the valve hole 51 is opened as a whole). In a state where the spool 70 abuts against the stopper 14s, the pilot member 80 does not protrude in the reverse direction from the valve hole 51. Refrigerant from an unillustrated evaporator enters the suction chamber 20 through the valve hole 51.

(reverse direction)

As shown in fig. 23, when the refrigerant flows in the reverse direction (arrow AR2), the pilot member 80 receives pressure (fluid pressure) from the refrigerant. This pressure acts to move the pilot member 80 in the reverse direction (in other words, the downstream side in the reverse direction when the refrigerant flows in the reverse direction). As the pilot member 80 moves, the passage cross-sectional area through which the refrigerant in the valve hole 51 can pass gradually decreases. The pilot member 80 further enters into the valve hole 51, so that the pilot member 80 further partially blocks the valve hole 51.

The cross-sectional area of the passage through which the refrigerant can pass in the valve hole 51 is further reduced, so that the flow velocity of the refrigerant flowing near the pilot member 80 is increased, and a larger force to move the pilot member 80 to the downstream side acts on the pilot member 80. The force generated in accordance with the movement of the pilot member 80 is applied to the valve body 70 via the connection portion 64. The valve body 70 is pulled by the pilot member 80 (the connection portion 64) and moves toward the downstream side in the reverse direction (the downstream side in the reverse direction when the refrigerant flows in the reverse direction).

As shown in fig. 24, the pilot member 80 passes through the valve hole 51 in the reverse direction, and pulls the spool 70 to move the spool 70 further in the reverse direction. In a state where the seal surface 75 of the valve body 70 is in contact with the valve seat 52 of the valve seat member 50, the valve hole 51 is closed by a differential pressure via the valve body 70 in contact with the valve seat member 50. The refrigerant may be restricted from flowing in the reverse direction (arrow AR 3).

(action and Effect of embodiment 4)

In the check valve 40D according to embodiment 4, a pilot member 80 whose relative distance from the valve body 70 in the opening/closing direction of the valve body 70 is variable is connected to the valve body 70. The check valve 40D can be configured to be lighter and smaller, and can contribute to downsizing of the entire compressor 10, for example, by not providing a spring for biasing the valve body 70 in the valve closing direction (for example, between the valve body 70 and the cylinder 14).

[ embodiment 5]

Fig. 25 is a sectional view showing a check valve 40E in embodiment 5. The check valve 40B in embodiment 2 differs from the check valve 40E in embodiment 5 in that the pilot member 80 of the check valve 40E is formed of a flat plate, and the coupling portion 64 of the check valve 40E is formed of a coil spring.

(Positive direction)

As shown in fig. 26, when the refrigerant flows in the forward direction (arrow AR1), the pilot member 80 receives the pressure from the refrigerant, the coupling portion 64 receives the pressing force from the pilot member 80 and contracts toward the downstream side, and the valve body 70, the coupling portion 64, and the pilot member 80 receive the pressure from the refrigerant as a whole and move in a direction to open the valve hole 51 (in other words, the valve body 70, the coupling portion 64, and the pilot member 80 are disposed at positions to open the valve hole 51 as a whole). In a state where the spool 70 abuts against the stopper 14s, the pilot member 80 does not protrude in the reverse direction from the valve hole 51. Refrigerant from an unillustrated evaporator enters the suction chamber 20 through the valve hole 51.

(reverse direction)

As shown in fig. 27, when the refrigerant flows in the reverse direction (arrow AR2), the pilot member 80 receives pressure (fluid pressure) from the refrigerant. This pressure acts to move the pilot member 80 in the reverse direction (in other words, the downstream side in the reverse direction when the refrigerant flows in the reverse direction). As the pilot member 80 moves, the passage cross-sectional area through which the refrigerant in the valve hole 51 can pass gradually decreases. The pilot member 80 enters the valve hole 51 so that the pilot member 80 partially blocks the valve hole 51.

The cross-sectional area of the passage through which the refrigerant in the valve hole 51 can pass is reduced, so that the flow velocity of the refrigerant flowing near the pilot member 80 is increased, and a larger force to move the pilot member 80 toward the downstream side acts on the pilot member 80. The force generated in accordance with the movement of the pilot member 80 is applied to the valve body 70 via the connection portion 64. The valve body 70 is pulled by the pilot member 80 (the connection portion 64) and moves in the reverse direction (the downstream side in the reverse direction when the refrigerant flows in the reverse direction).

As shown in fig. 28, the pilot member 80 passes through the valve hole 51 in the reverse direction, and pulls the spool 70 to move the spool 70 further in the reverse direction. In a state where the seal surface 75 of the valve body 70 is in contact with the valve seat 52 of the valve seat member 50, the valve hole 51 is closed by a differential pressure via the valve body 70 in contact with the valve seat member 50. The refrigerant may be restricted from flowing in the reverse direction (arrow AR 3).

(action and Effect of embodiment 5)

In the check valve 40E according to embodiment 5, a pilot member 80 whose relative distance from the valve body 70 in the opening/closing direction of the valve body 70 is variable is connected to the valve body 70. The check valve 40E can be configured to be lighter and smaller, and can contribute to downsizing of the entire compressor 10, for example, by not providing a spring for biasing the valve body 70 in the valve closing direction (for example, between the valve body 70 and the cylinder 14).

[ embodiment 6]

Fig. 29 is a sectional view showing a check valve 40F in embodiment 6. The check valve 40 in embodiment 1 differs from the check valve 40F in embodiment 6 in the following respects.

Of the check valves 40F, the entire check valve 40F is disposed in the suction port 22. In the check valve 40F, the valve seat member 50 and the support member 68 are press-fitted to the inner wall surface of the suction port 22. The support member 68 has a communication hole 68H. The cylindrical body 62 is fixed to the surface of the support member 68, and a communication hole 62H is formed in the cylindrical body 62. In the present embodiment, the cylindrical portion 73 of the valve body 70 is also formed with a communication hole 73H.

(Positive direction)

As shown in fig. 29, when the refrigerant flows in the forward direction (arrow AR1), the valve body 70 and the pilot member 80 receive the pressure from the refrigerant and move in a direction to open the valve hole 51 (in other words, the valve body 70 and the pilot member 80 are disposed at positions away from the valve hole 51).

The 1 st locking portion 84 formed in the bottom portion 83 of the pilot member 80 and the 2 nd locking portion 74 formed in the 2 nd plate-like portion 72 of the spool 70 are separated from each other. The surface 85 of the pilot member 80 contacts the 2 nd plate-like portion 72 of the spool 70. In a state where the spool 70 abuts against the stopper 14s, the pilot member 80 does not protrude in the reverse direction from the valve hole 51. The refrigerant from the evaporator, not shown, passes through the valve hole 51, the communication hole 62H, the communication hole 73H, and the communication hole 68H and enters the suction chamber 20.

(reverse direction)

As shown in fig. 30, when the refrigerant flows in the reverse direction (arrow AR2), the pilot member 80 receives pressure (fluid pressure) from the refrigerant. This pressure acts to move the pilot member 80 toward the side where the valve hole 51 is located. As the pilot member 80 approaches the valve seat member 50 (valve hole 51), the passage cross-sectional area through which the refrigerant in the valve hole 51 can pass gradually decreases as the pilot member 80 approaches.

The bottom portion 83 of the pilot member 80 contacts the 2 nd plate-like portion 72 of the spool 70, and the 1 st locking portion 84 and the 2 nd locking portion 74 are locked to each other. Since the 1 st locking portion 84 and the 2 nd locking portion 74 are locked to each other, a force generated in accordance with the movement of the pilot member 80 is applied to the valve body 70 through the locking portion.

In a state where the 1 st locking portion 84 and the 2 nd locking portion 74 are locked to each other, the valve body 70 is pulled by the pilot member 80 and moves toward the downstream side in the reverse direction (the downstream side in the reverse direction when the refrigerant flows in the reverse direction). The valve body 70 can more stably approach and move toward the valve seat member 50 by the cylindrical body 62.

As shown in fig. 31, the pilot member 80 passes through the valve hole 51 in the reverse direction, and pulls the valve body 70 to further move the valve body 70 in the reverse direction. In a state where the seal surface 75 of the valve body 70 is in contact with the valve seat 52 of the valve seat member 50, the valve hole 51 is closed by a differential pressure via the valve body 70 in contact with the valve seat member 50. In the closed state, the pressure in the space on the suction chamber 20 side with respect to the suction port 22 is higher than the pressure in the space on the joint 24 side with respect to the suction port 22. Due to this pressure difference, the spool 70 is continuously pressed against the valve seat 52, and the pilot member 80 (bottom portion 83) is continuously pressed against the 2 nd plate-like portion 72 of the spool 70. The valve hole 51 is closed by the valve body 70, and the insertion hole 71 of the valve body 70 is closed by the bottom portion 83 of the pilot member 80. The refrigerant may be restricted from flowing in the reverse direction (arrow AR 3).

(action and Effect of embodiment 6)

Also in the check valve 40F according to embodiment 6, the check valve 40F can be configured to be lighter and smaller, and can contribute to downsizing of the entire compressor 10, and the like, by eliminating the provision of a spring (for example, between the valve body 70 and the cylinder 14) for biasing the valve body 70 in the valve closing direction.

Also in the check valve 40F according to embodiment 6, the pilot member 80 performs an operation of receiving the pressure of the refrigerant and starting to move toward the valve hole 51, and the valve body 70 moves along with the movement of the pilot member 80, and the valve body 70 performs an operation of contacting the valve seat 52 to close the valve hole 51. Also in the check valve 40F according to embodiment 6, the valve body 70 and the pilot member 80 can be easily moved from the valve-open position to the valve-closed position by the pressure of the refrigerant, and the valve hole 51 can be stably opened and closed by the cooperation of the pilot member 80 and the valve body 70 without using a spring.

[ embodiment 7]

Fig. 32 is a sectional view showing a check valve 40G in embodiment 7. The check valve 40G of the present embodiment is different from the above-described embodiments in that the valve body 70 includes the spring 88. The spring 88 is disposed between the stopper 14s and the main body portion of the valve body 70 on which the seal surface 75 is formed. The spring 88 biases the main body portion of the valve body 70 toward the valve hole 51 side, but in a state where the valve body 70 closes the valve hole 51 (a state where the valve body 70 is in contact with the valve seat member 50), the spring 88 does not bias the main body portion of the valve body 70. That is, the spring 88 is not a member for closing the valve hole 51, and is configured to be smaller than a conventionally used spring for closing the valve. Even with the check valve 40G having this configuration, the check valve 40G can be made lighter and smaller than a conventional check valve having a spring for closing the valve, and this can contribute to downsizing of the entire compressor 10.

The spring 88 is not limited to the above configuration, and may be configured to be separated from the valve body 70 and fixed to the recess 14a of the cylinder 14. In this case, the valve body 70 is configured to be able to separate from and contact the spring 88, and a portion of the spring 88 that contacts the valve body 70 constitutes the stopper 14 s. Even with this configuration, the spring 88 biases the valve body 70 toward the valve hole 51, but the spring 88 does not bias the valve body 70 in a state where the valve body 70 closes the valve hole 51. The spring 88 is not a member for closing the valve hole 51, and is configured to be smaller than a conventionally used spring for closing the valve. Even with the check valve 40G having this configuration, the check valve 40G can be made lighter and smaller than a conventional check valve having a spring for closing the valve, and this can contribute to downsizing of the entire compressor 10.

The operation and effect achieved by the technical ideas disclosed in the above-described embodiments can be obtained even when the check valve is provided with the spring 88 as described above (a spring that does not bias the valve body 70 in the valve closing direction in the valve closed state). That is, the technical meaning of the expression even if the spring is not used does not positively exclude the check valve to which such a spring 88 is added from the disclosure range of the present specification or the claims.

Embodiments of the present invention are described, but it should be appreciated that: the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the appended claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims

1. A compressor having a check valve for allowing a refrigerant to flow in a forward direction toward a compression chamber and restricting the refrigerant from flowing in a reverse direction,

the check valve includes:

a valve seat member having a valve hole through which the refrigerant passes;

a valve body disposed on a downstream side of the valve seat member in the forward direction, and configured to open and close the valve hole by coming into contact with and separating from the valve seat member; and

a stopper that restricts movement of the valve body in an opening/closing direction of the valve body on an opposite side of the valve seat member with respect to the valve body,

a pilot member is coupled to the valve element via a coupling portion that changes a relative distance between the pilot member and the valve element in an opening/closing direction of the valve element,

the pilot member is capable of passing through the valve hole, the pilot member does not protrude from the valve hole in the opposite direction in a state where the valve body abuts against the stopper,

when the refrigerant flows in the reverse direction, the pilot member receives a pressure from the refrigerant, and the pilot member passes through the valve hole in the reverse direction and pulls the valve body to move the valve body in the reverse direction, so that the valve hole is closed by a differential pressure via the valve body in contact with the valve seat member.

2. The compressor of claim 1, wherein the compressor is a compressor,

the pilot member has a 1 st click section,

the valve body has a 2 nd locking part locked in the 1 st locking part,

the 1 st locking part and the 2 nd locking part are separated from each other when the refrigerant flows in the forward direction,

when the refrigerant flows in the reverse direction, the pilot member moves in the reverse direction, the 1 st locking portion and the 2 nd locking portion are locked to each other, and the valve body moves in the reverse direction in a state where the 1 st locking portion and the 2 nd locking portion are locked to each other.

3. The compressor of claim 1, wherein the compressor is a compressor,

the pilot member has a 1 st plate-like portion and a shaft portion provided upright on a portion of the 1 st plate-like portion opposite to a side where the valve hole is located,

the valve body has a 2 nd plate-shaped portion having an insertion hole through which the shaft portion is inserted, and a cylindrical portion provided in a portion of the 2 nd plate-shaped portion on a side opposite to a side where the valve hole is located,

a gap is formed between the 1 st plate-like portion and the 2 nd plate-like portion in a state where the refrigerant flows in the forward direction.

4. The compressor of claim 2, wherein the compressor is a compressor,

5. The compressor of claim 1, wherein the compressor is a compressor,

the connecting portion is composed of at least 1 of a rope, a chain, a rod, a coil spring and a flat plate.

6. The compressor of claim 5, wherein the compressor is a compressor,

the pilot member has a spherical shape, a flat plate shape, or a hollow tapered shape.

7. The compressor according to any one of claims 1 to 6,

the pilot member is configured to be lighter than the spool.

8. The compressor according to any one of claims 1 to 6,

the compressor further includes a guide portion that guides movement of the valve body by sliding contact with the valve body.

9. The compressor of claim 7, wherein said compressor is a compressor,

10. The compressor according to any one of claims 1 to 6,

the compressor includes a housing having a suction port through which the refrigerant passes, and a suction chamber formed therein and communicating with the suction port,

the valve seat member is disposed within the suction port,

the pilot member and the valve element are disposed in the suction chamber.

11. The compressor of claim 7, wherein said compressor is a compressor,

the valve seat member is disposed within the suction port,

the pilot member and the valve element are disposed in the suction chamber.

12. The compressor of claim 8 wherein said compressor is a single-stage compressor,

the valve seat member is disposed within the suction port,

the pilot member and the valve element are disposed in the suction chamber.

13. The compressor of claim 9, wherein said compressor is a single-stage compressor,

the valve seat member is disposed within the suction port,

the pilot member and the valve element are disposed in the suction chamber.