WO2008066134A1

WO2008066134A1 - Control valve for variable displacement compressor

Info

Publication number: WO2008066134A1
Application number: PCT/JP2007/073104
Authority: WO
Inventors: Koichi Shimada; Takashi Kobayashi
Original assignee: Calsonic Kansei Corporation
Priority date: 2006-11-30
Filing date: 2007-11-29
Publication date: 2008-06-05
Also published as: JP4925800B2; CN101542120A; US20100068074A1; EP2090779A1; JP2008138540A

Abstract

A control valve is adapted such that the closer to one end is a high-pressure-side valve body placed by a solenoid, the greater the degree of communication of a high-pressure valve section is and the less the discharge flow path-side pressure acting on the high-pressure-side valve body is. The control valve is also adapted such that the closer to the other end is a low-pressure-side valve body placed by the solenoid, the greater the degree of communication of a low-pressure valve section is, that the high-pressure-side valve body and low-pressure-side valve body are integrally placed on the one side by the solenoid, and that the high-pressure-side valve body and low-pressure-side valve body are separated when the low-pressure-side valve body is placed on the other side by the solenoid.

Description

Specification

Control valve for variable displacement compressor

Technical field

[0001] The present invention relates to a control valve for a variable displacement compressor.

Background art

Conventionally, as a control valve for a variable capacity compressor used in a refrigeration cycle such as an air conditioner for an automobile, a high pressure provided in the middle of an introduction side communication path that connects a discharge flow path of the variable capacity compressor and a control pressure chamber. A valve portion, and a low pressure valve portion provided in the middle of the discharge side communication passage communicating the suction flow path and the control pressure chamber, and variably controlling the opening degree of the high pressure valve portion and the low pressure valve portion. It is known that the angle of the swash plate is changed by changing the pressure in the control pressure chamber.

In such a configuration, the case chamber (crank chamber) is often used as a control pressure chamber. In this case, when the control pressure (control pressure chamber pressure) is increased, the swash plate angle is reduced and the discharge capacity is reduced. When the control pressure is lowered, the swash plate angle increases and the discharge capacity increases (for example, Patent Document 1).

[0004] However, in the control valve disclosed in Patent Document 1, since the discharge pressure acts in the direction of closing the valve body in the ball valve as the high pressure valve portion, the swash plate angle is reduced to reduce the discharge capacity. When performing the control to reduce, there is a possibility that the high pressure valve portion is unintentionally closed by the discharge pressure, the control pressure is lowered, the swash plate angle is increased, and the discharge capacity is increased.

[0005] In addition to the above-described ball valve as the high pressure valve portion, there is a conventional force in which the valve body of the low pressure valve portion is integrated with the spool valve as the high pressure valve portion. There was a problem that when the start-up slowed down due to the occurrence of a leak in the clearance between the sleeve and the spool at the pressure valve section, the start-up became slow!

[0006] Therefore, the present invention provides a variable displacement compressor that can prevent the high-pressure valve portion from being inadvertently closed due to an increase in the discharge pressure, thereby increasing the swash plate angle, and further improving the startability. The purpose is to obtain a control valve.

Patent Document 1: International Publication WO2004 / 065789 Disclosure of the invention

[0007] In the present invention, the high-pressure valve portion provided in the middle of the introduction-side communication path that connects the discharge flow path of the variable capacity compressor and the control pressure chamber, the suction flow path, the control pressure chamber, A low-pressure valve portion provided in the middle of the discharge-side communication passage, and variably controlling the opening degree of the high-pressure valve portion and the low-pressure valve portion to change the pressure of the control pressure chamber to In the control valve of the variable displacement compressor that changes the angle, the control valve comprises position control means for controlling advancing and retreating positions of the high pressure side valve body of the high pressure valve portion and the low pressure side valve body of the low pressure valve portion, and the position control means As the high-pressure side valve body is arranged on one side, the communication opening of the high-pressure valve portion increases, and the pressure on the discharge flow path side acting on the high-pressure side valve body is reduced. The low pressure side valve element is arranged on the other side by means. The communication opening degree of the low-pressure valve portion is increased so that the high-pressure side valve body and the low-pressure side valve body are integrally disposed on the one side by the position control means, while the position control means When the low pressure side valve element is disposed on the other side, the high pressure side valve element and the low pressure side valve element are separated from each other.

[0008] Further, in the present invention, the low pressure valve portion may be configured to be fully closed when the high pressure side valve body and the low pressure side valve body are arranged on one side by the position control means. it can.

[0009] Further, the present invention can be configured to include urging means for urging only the low-pressure side valve body out of the high-pressure side valve body and the low-pressure side valve body.

Brief Description of Drawings

FIG. 1 is a schematic diagram of a device configuration of a variable displacement compressor and a control valve according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the control valve of the variable displacement compressor according to the embodiment of the present invention, in which the high pressure valve portion is closed! / And the low pressure valve portion is open! / FIG.

FIG. 3 is an enlarged view of part A in FIG.

FIG. 4 is an enlarged view of a portion B in FIG.

FIG. 5 is a longitudinal sectional view of a control valve of a variable displacement compressor according to an embodiment of the present invention, showing a state in which a high pressure valve portion is open and a low pressure valve portion is closed.

[Fig. 6] Fig. 6 is a diagram showing the possibility of the control valve of the variable displacement compressor according to the embodiment of the present invention. It is a graph which shows the correlation with the position of a moving part, and the opening area of a high pressure valve part and a low pressure valve part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a device configuration of a variable displacement compressor and a control valve that are applied to this embodiment, and FIG. 2 is a longitudinal sectional view (a sectional view including a central axis) of the control valve, in which a high-pressure valve portion is Fig. 3 is an enlarged view of part A in Fig. 2, Fig. 4 is an enlarged view of part B in Fig. 2, and Fig. 5 is a longitudinal section of the control valve. FIG. 6 is a diagram showing a state in which the high-pressure valve portion is open and the low-pressure valve portion is closed, and FIG. 6 is a correlation between the position of the movable portion in the control valve and the opening area of the high-pressure valve portion and the low-pressure valve portion. It is a graph which shows.

As shown in FIG. 1, the control valve 1 according to the present embodiment controls a control pressure Pc that changes the inclination angle of the swash plate 2 a that changes the discharge capacity of the variable displacement compressor 2. Therefore, as an example, the pressure (control pressure) Pc in the case chamber 3 as the control pressure chamber is controlled. In this case, the lower the pressure Pc in the case chamber 3 is, the larger the pressure difference acting on the piston in the variable displacement compressor 2 is, and the discharge capacity is increased. Conversely, the higher the pressure in the case chamber 3 is, the higher the discharge capacity is. Will be reduced.

[0013] The control pressure Pc is an intermediate pressure between the medium pressure (discharge pressure) Pd in the discharge flow path 4 (for example, the discharge port) and the medium pressure (suction pressure) Ps in the suction flow path 5 (for example, the intake port). It is generated as For this purpose, the control valve 1 is provided in the middle of the introduction-side communication path 6 that communicates the discharge flow path 4 and the case chamber 3, and the suction flow path 5 And a low pressure valve section 9 that is provided in the middle of the discharge side communication path 8 that communicates with the case chamber 3 and that variably controls the communication opening degree. Pc is generated. In such a configuration, the control pressure Pc approaches the discharge pressure Pd and becomes higher as the communication opening in the high-pressure valve section 7 is larger, while the control pressure Pc increases as the communication opening in the low-pressure valve section 9 increases. The pressure becomes low. In addition, by controlling both the opening degree of the high pressure valve section 7 and the opening degree of the low pressure valve section 9, the flow of the medium from the discharge flow path 4 to the suction flow path 5 is suppressed and energy loss is suppressed. It is possible to generate the control pressure Pc while reducing the pressure. In the present embodiment, the medium circulation path (including the introduction-side communication path 6 and the discharge-side communication path 8) used for generating the control pressure Pc is also used as the medium circulation path in the case chamber 3. It helps to lubricate and cool the sliding parts. For this reason, the opening 6a of the introduction-side communication passage 6 facing the case chamber 3 and the opening 8a of the discharge-side communication passage 8 are arranged appropriately spaced from each other, and reach from the high-pressure valve section 7 to the low-pressure valve section 9. The media path to the site is also somewhat longer. Therefore, the pressure Pel on the case chamber 3 side in the high pressure valve portion 7 is slightly higher than the pressure Pc2 on the case chamber 3 side in the low pressure valve portion 9.

As shown in FIG. 2, the control valve 1 includes a solenoid 10 incorporating a solenoid as a position control means, and a valve unit 11 incorporating a high-pressure valve unit 7 and a low-pressure valve unit 9. Yes.

[0016] In the valve part 11, the valve body of the high pressure valve part 7 (high pressure side valve body 7a) and the valve body of the low pressure valve part 9 (low pressure side valve body 9a) are connected to the movable part 10a of the solenoid. They are arranged in tandem in the advancing / retreating direction and are in contact with each other, and are pressed against the movable part 10a by coil springs 14, 16, etc. as urging means, and by changing the advance / retreat position of the movable part 10a, the high pressure side The positions of the valve body 7a and the low pressure side valve body 9a are made variable so that the communication opening degree of both the high pressure valve section 7 and the low pressure valve section 9 can be controlled. In the present embodiment, the low pressure side valve body 9a is disposed on the side closer to the movable portion 10a, and the high pressure side valve body 7a is disposed on the far side. In the following description, for the sake of convenience, the pointing direction of the arrow X in FIGS. 2 to 5 is referred to as the distal end side, and the opposite side is referred to as the proximal end side. The movable part 10a, the low-pressure side valve body 9a, and the high-pressure side valve body 7a advance and retreat along the X direction. This X direction is along the axial direction of the sleeve 12, the spool 13, and the solenoid movable portion 10a.

The valve portion 11 includes a substantially cylindrical sleeve 12 having a through hole 12a having a circular cross section in the longitudinal direction, and a spool 13 is inserted into the through hole 12a with an appropriate clearance. In the through-hole 12a, it can advance and retreat along its longitudinal direction.

A high pressure valve portion 7 is formed on the distal end side of the valve portion 11. Here, a specific configuration of the high-pressure valve unit 7 will be described with reference to FIG. 2 and FIG.

[0019] A bottomed cylindrical recess 12b having a diameter larger than that of the through hole 12a is formed on the distal end side of the through hole 12a of the sleeve 12, and the opening 12e side of the recess 12b is closed by a lid 12d. [0020] On the other hand, an umbrella-shaped poppet 13a projecting slightly outward from the through hole 12a is formed at the tip of the spool 13. The poppet 13a is accommodated in the recess 12b. 2 and 3, the bottom surface 13b of the poppet 13a and the bottom surface 12c of the recess 12b are in contact with each other. In the present embodiment, the poppet 13a corresponds to the high-pressure side valve body 7a of the high-pressure valve portion 7, and the bottom surface 12c of the recess 12b corresponds to the sealing surface (sitting surface).

[0021] Here, a coil spring 14 as an urging means is interposed between the lid 12d and the poppet 13a. The poppet 13a is inserted into the X direction base end side by the coil spring 14, that is, the poppet 13a. The high pressure side valve element 7a is biased in the valve closing direction.

The sleeve 12 is formed with a lateral hole port 12f orthogonal to the through hole 12a at a position spaced from the opening 12e on the distal end side of the through hole 12a by a predetermined distance from the X direction base end side. The spool 13 is formed with a small diameter portion 13c having a substantially constant circular cross section that is narrowly wound from the bottom surface 13b of the poppet 13a to a position facing the side hole port 12f.

[0023] Then, the case chamber 3 side of the introduction side communication path 6 (not shown in Figs. 2 and 3) is communicated with the recess 12b through the through hole 12g formed in the lid 12d, while the introduction side communication path The discharge channel 4 side of the passage 6 communicates with the side hole port 12f. Therefore, the pressure in the recess 12b, that is, the back pressure of the poppet 13a becomes the control pressure (Pel), and the pressure in the gap 12h corresponding to the side hole port 12f and the narrow diameter portion 13c of the spool 13 becomes the discharge pressure Pd.

Here, the discharge pressure Pd acts on the tip end side in the X direction of the narrow diameter portion 13c of the spool 13, and the end face on the base end side in the X direction of the narrow diameter portion 13c of the spool 13 The discharge pressure Pd acts on the tip in the X direction. Accordingly, the discharge pressure Pd acting on the spool 13 is reduced (offset) in the axial direction of the spool 13.

[0025] With the above configuration, when the spool 13 moves to the tip end side in the X direction and the poppet 13a as the high pressure side valve element 7a is separated from the bottom surface 12c as the seating surface, the high pressure valve portion 7 is opened. As a result, the introductory communication path 6 communicates. The communication opening degree by the high-pressure valve part 7 increases according to the distance from the bottom surface 12c of the poppet 13a. On the other hand, the state in which the spool 13 is positioned on the most proximal side in the X direction and the poppet 13a is seated on the bottom surface 12c corresponds to the state in which the high-pressure valve portion 7 is closed. It is designed to be blocked. In such a configuration, the sealing performance in the high pressure valve portion 7 can be improved by making the poppet 13a fit into the bottom surface 12c. Then, the position of the poppet 13a in the X direction, that is, the communication opening degree of the high-pressure valve section 7 is controlled by a solenoid as a position control means described later.

A low pressure valve portion 9 is formed on the base end side of the valve portion 11. Here, a specific configuration of the low-pressure valve unit 9 will be described with reference to FIGS. 2, 4, and 5.

[0027] In the sleeve 12, another lateral hole port 12i perpendicular to the through hole 12a is formed at a position spaced from the lateral hole port 12f by a predetermined distance toward the base end side in the X direction. A small-diameter portion 13d having a substantially constant circular cross section that is narrowly formed from a position facing the lateral hole port 12i to an end portion on the proximal end side is formed.

[0028] It should be noted that the clearance between the through hole 12a and the section (general part 13e) existing between the side hole port 12f and the side hole port 12i in the spool 13 is narrowed so that the medium between the side hole ports 12f and 12i Leakage is reduced.

[0029] Further, a bottomed cylindrical concave portion 1 having a diameter larger than that of the through hole 12a is formed on the proximal end side of the through hole 12a of the sleeve 12. The distal end side of the side wall 12k of the concave portion 1 is press-fitted into a concave groove 10b provided on the distal end side of the solenoid 10 so that the valve portion 11 and the solenoid 10 are coupled.

[0030] A poppet 15 as a low-pressure side valve element 9a is arranged in the recess 1/3. The poppet 15 is formed with a substantially cylindrical recess 15a, and the small diameter portion 13d of the spool 13 is loosened in the recess 15a.

[0031] An annular protrusion 15b is provided on the tip end side of the poppet 15 in the X direction. As shown in FIG. 5, when the poppet 15 is located on the most tip end side in the X direction, the protrusion 15b Is inserted into the through-hole 12a from the opening 12m on the base end side of the through-hole 12a, and the top surface 15c around the protrusion 15b and the bottom surface 12η of the recess 1 are in contact with each other. As described above, in this embodiment, the poppet 15 corresponds to the low-pressure side valve body 9a of the low-pressure valve portion 9, and the bottom surface 12η of the recess 1¾ corresponds to the seal surface (seat surface).

[0032] Further, a coil spring 16 as an urging means is interposed between the bottom surface 12η and the poppet 15, and the poppet 15 is supported by the coil spring 16 in the X direction base end side, that is, The low pressure side valve element 9a is biased in the valve opening direction.

[0033] And, the case chamber 3 side of the discharge side communication passage 8 (not shown in Figs. 2, 4 and 5) is communicated with the lateral hole port 12i, while the suction flow path 5 side of the discharge side communication passage 8 is the side wall 12k. It communicates with the inside of the recess 1 ¾ through a through-hole 12ο formed in the inner wall. Accordingly, the pressure in the recess 1, that is, the back pressure of the poppet 15 becomes the suction pressure Ps, and the pressure of the side hole port 12 i becomes the control pressure (Pc 2).

That is, in the present embodiment, when the spool 13 moves to the base end side in the X direction and the poppet 15 as the low pressure side valve body 9a is separated from the bottom surface 12η as the seating surface, the low pressure valve portion 9 opens. In this state, the discharge side communication passage 8 communicates. The communication opening degree by the low-pressure valve part 9 increases in accordance with the separation distance from the bottom surface 12η of the poppet 15. On the other hand, the state in which the spool 13 is positioned at the most distal end in the X direction and the poppet 15 is seated on the bottom surface 12η corresponds to the state in which the low pressure valve 9 is closed, and in this state, the discharge side communication path 8 is blocked. It is supposed to be done. In such a configuration, the sealing performance in the low-pressure valve portion 9 can be improved by making the poppet 15 conform to the bottom surface 12η by pressing it. Then, the position of the poppet 15 in the X direction, that is, the communication opening degree of the low-pressure valve section 9 is controlled by a solenoid as a position control means described later.

[0035] The movable portion 10a of the solenoid 10 is disposed on the proximal end side of the poppet 15 as the low pressure side valve body 9a.

[0036] In the present embodiment, the movable portion 10a has a shape in which a first member 10c located on the distal end side in the X direction and a second member 10d located on the proximal end side are arranged in the X direction and integrally coupled to each other. It is. The first member 10c is formed with a concave portion 10e whose front end side is expanded in a mortar shape and whose proximal end side is substantially cylindrical, and a poppet 15 is loosened in the concave portion 10e. At this time, the bottom surface 15d of the poppet 15 is brought into contact with the bottom surface 10f of the concave portion 10e, and the poppet 15 is pressed against the first member 10c by the coil spring 16. Due to the clearance between the inner wall of the recess 10e and the outer wall of the poppet 15, the axial displacement between the poppet 15 and the movable part 10a can be absorbed!

[0037] A flange portion 10g is formed at the tip of the first member 10c. This flange portion 10g is locked to the opening edge of the recess 10i formed on the front end side of the casing 10h of the solenoid 10. As a result, the movement of the movable portion 10a toward the base end is restricted.

[0038] A coil spring 17 as an urging means is interposed between the back surface 10j of the flange portion 10g and the stepped portion 10k formed on the side wall of the concave portion 10i. By this coil spring 17, the movable portion 10a Is biased toward the tip in the X direction.

[0039] The recess 10i is isolated by an annular plate-shaped diaphragm 18. The peripheral edge of the diaphragm 18 is mounted with a seal secured to the casing 10h.

The central portion of the diaphragm 18 is sandwiched between the first member 10c and the second member 10d in a state where a seal is ensured.

[0040] Here, since the recess 10i communicates with the recess 1¾ via a passage 10m penetrating the front and back of the flange portion 10g, the recess 10i is in the recess 10i, that is, on the front surface (surface) of the diaphragm 18. The acting pressure is the suction pressure Ps. On the other hand, due to the sealing by the diaphragm 18, the pressure acting on the base end side surface (back surface) of the diaphragm 18 is atmospheric pressure. Therefore, when the suction pressure Ps increases from a predetermined value, the movable portion 10a moves to the proximal end side due to the differential pressure acting on the diaphragm 18.

[0041] Further, a shaft 19 is coupled to the movable portion 10a, and the shaft 19 is urged toward the distal end side by a coil spring 20 as urging means disposed on the proximal end side.

[0042] With the above configuration, when the coil 21 is energized, a force that causes a directional force and a suction force to act on the movable portion 10a (second member 10d) toward the base end side is attracted by controlling the current to the coil 21. By adjusting the force, the movable part 10a and the low-pressure side valve body 9a in contact with the movable part 10a are balanced by the balance between this suction force and the urging force of the coil springs 14, 16, 17, 20 as urging means. The position of the poppet 15 in the X direction is determined as well as the poppet 13a as the high-pressure side valve element 7a provided on the spool 13 that contacts the poppet 15.

[0043] Here, when the movable portion 10a moves to the proximal end side by energization control to the coil 21 or the increase of the suction pressure Ps acting on the diaphragm 18, the action of the coil spring 16 as the biasing means causes the low pressure side. The poppet 15 as the valve body 9a also moves to the base end side in conjunction with the movable part 10a, and further, the poppet 13a as the high-pressure side valve body 7a provided on the spool 13 by the action of the coil spring 14 as the biasing means Will move to the base end side in conjunction with the movable part 10a. However, in the present embodiment, the spool 13 provided with the poppet 13a and the poppet 15 are configured to be separated from each other, and therefore, as shown in FIG. After the poppet 13a is seated on the bottom surface 12c as the seating surface, the poppet 15 is separated from the spool 13, and only the low pressure valve section 9 increases the communication opening.

FIG. 6 shows the communication opening degree of the high-pressure valve part 7 and the low-pressure valve part 9 with respect to the position in the X direction of the movable part 10a in the control valve 1 having the above configuration. In FIG. 6, the horizontal axis indicates the position of the movable portion 10a in the X direction, with the right side being the proximal end side and the left side being the distal end side. The vertical axis represents the communication opening (opening area).

[0046] The communication opening degree of the high-pressure valve part 7 changes linearly depending on the position of the movable part 10a, that is, the position of the poppet 13a. That is, when the movable part 10a is located at the most distal end side (Fig. 5), the communication opening degree of the high pressure valve part 7 is maximized, and as the position of the movable part 10a changes to the proximal end side, the high pressure valve part 7 When the poppet 13a as the high pressure side valve element 7a contacts the bottom surface 12c as the seating surface, the high pressure valve section 7 is closed and the communication opening becomes 0. . When the high-pressure valve section 7 is closed, the case chamber is caused by a force that stops the supply of the medium into the case chamber 3 through the introduction side communication passage 6, leakage from the clearance between the piston and the cylinder, and the like. The supply of the medium into the 3 can be secured.

[0047] The communication opening degree of the low-pressure valve part 9 is also different in the force S that changes in accordance with the position of the movable part 10a and in the manner of change in accordance with the position of the movable part 10a. That is, first, in a state where the movable portion 10a is located at the most distal end side, the poppet 15 as the low pressure side valve element 9a contacts the bottom surface 12n as the seating surface, and the low pressure valve portion 9 is closed.

[0048] When the position of the movable portion 10a changes to the proximal end side, the poppet 15 moves away from the bottom surface 12η. While the poppet 15 is not so far away from the bottom surface 12η, the communication opening changes linearly (region 1). Thereafter, even when the separation distance from the bottom surface 12η of the poppet 15 increases, as long as the protrusion 15b is inserted into the through hole 12a, the communication opening degree of the low pressure valve section 9 is about the protrusion 15b and the through hole 12a. The clearance becomes dominant and becomes equivalent to a fixed orifice. Therefore, in this section, the change in the communication opening is almost constant (area 2). Thereafter, when the protrusion 15b comes out of the through hole 12a, the communication opening degree of the low pressure valve portion 9 increases linearly according to the distance from the bottom surface 12η of the poppet 15 (region 3). And in this area 3, As described above, since the poppet 15, that is, the low pressure side valve body 9 a is separated from the poppet 13 a, that is, the spool 13 including the high pressure side valve body 7 a (gap G), the high pressure valve portion 7 is closed and the high pressure side valve body is closed. Regardless of the movement of the base 7a toward the base end, the open degree of the low-pressure valve 9 can be quickly expanded.

As described above, according to the present embodiment, the discharge pressure Pd acting on the poppet 13a as the high-pressure side valve element 7a acts on both the X-direction proximal end side and the distal end side of the spool 13. Since it is configured to be attenuated, when the high pressure valve portion is in an open state as in the prior art, the high pressure valve portion is closed by the pressure Pd on the discharge flow path acting on the high pressure side valve body. It is possible to suppress the pressure in the chamber from decreasing. Therefore, when the angle of the swash plate 2a of the variable capacity compressor 2 is small, the communication opening degree of the high pressure valve section 7 is narrowed or closed, the pressure in the case chamber 3 is reduced, and the angle of the swash plate 2a is It is possible to suppress the increase.

[0050] That is, according to the present embodiment, a state in which there is almost no discharge capacity can be obtained more reliably by keeping the angle of the swash plate 2a small, so that the present invention is applied to a variable capacity compressor for a so-called clutchless system. It is suitable for. In this case, compared to a system that stops the rotation of the compressor using a clutch, there is an advantage that the number of parts can be reduced, the device configuration can be simplified, and the weight can be reduced.

[0051] According to the present embodiment, when the poppet 15 as the low-pressure side valve element 9a is arranged on the proximal end side by the solenoid 10 as the position control means, the poppet 13a as the high-pressure side valve element 7a is arranged. Since the poppet 15 as the low pressure side valve body 9a is separated, the opening of the low pressure valve portion 9 can be expanded without the poppet 15 being restricted by the poppet 13a. Therefore, when the variable displacement compressor 2 is started, the communication opening degree of the low pressure valve section 9 is expanded more quickly to reduce the control pressure Pc in the case chamber 3, and the angle of the swash plate 2a is increased. The required discharge capacity can be secured more quickly.

[0052] Further, since the high pressure side valve body 7a and the low pressure side valve body 9a are separable, the discharge pressure Pd acts on the high pressure side valve body 7a toward the tip end in the X direction. However, there is no hindrance to the operation of the low pressure side valve body 9a toward the base end side in the X direction.

[0053] Further, according to the present embodiment, the high pressure side valve is operated by the solenoid 10 as the position control means. Since the low pressure valve section 9 is fully closed when the poppet 13a as the body 7a and the poppet 15 as the low pressure side valve body 9a are arranged on the tip side, the control pressure Pc in the case chamber 3 is increased to a high pressure. As a result, the energy loss can be reduced as much as the leakage flow rate in the low pressure valve section 9 can be reduced.

[0054] Further, since the low-pressure valve unit 9 is configured to be closed, the communication opening degree of the low-pressure valve unit 9 in the closed state is naturally smaller than that in the non-closed configuration, and according to the present embodiment, the high-pressure side valve Since the body 7a and the low pressure side valve body 9a are separated from each other, they can be integrated! Switching from the state in which the valve section 9 is closed, that is, the control pressure Pc in the case chamber 3 is high, to the state in which the low pressure valve section 9 is open, that is, the control pressure Pc in the case chamber 3 is low, is performed more quickly. Control responsiveness can be improved.

Furthermore, according to the present embodiment, the poppet 13a and the poppet 15 can be more quickly separated by the coil spring 17 that biases only the poppet 15 toward the proximal end without biasing the poppet 13a. Therefore, the communication opening degree of the low pressure valve section 9 can be expanded more quickly, and the control response can be improved.

[0056] While the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, the poppet valve may be changed to a ball valve or a needle valve. Further, the direction of the suction force by the solenoid, the configuration for generating the suction force, the configuration of each valve unit, the configuration of the urging means, etc. are not limited to the above embodiment.

Industrial applicability

The present invention can be used as a control valve for a variable displacement compressor.

Claims

The scope of the claims

[1] A high-pressure valve portion provided in the middle of the introduction-side communication path that connects the discharge flow path of the variable capacity compressor and the control pressure chamber, and a discharge-side communication path that connects the suction flow path and the control pressure chamber. A variable capacity compressor that changes the pressure of the control pressure chamber to change the angle of the swash plate by variably controlling the communication opening degree of the high pressure valve portion and the low pressure valve portion. In the control valve of

Position control means for controlling the advancing and retracting positions of the high pressure side valve body of the high pressure valve portion and the low pressure side valve body of the low pressure valve portion;

As the high pressure side valve element is arranged on one side by the position control means, the communication opening degree of the high pressure valve part is increased, and the pressure on the discharge flow path side acting on the high pressure side valve element is reduced. ,

The communication control opening degree of the low-pressure valve portion is increased as the low-pressure side valve element is arranged on the other side by the position control means,

When the high pressure side valve body and the low pressure side valve body are integrally disposed on the one side by the position control means, the low pressure side valve body is disposed on the other side by the position control means. A control valve for a variable displacement compressor, characterized in that the high-pressure side valve element and the low-pressure side valve element are separated from each other.

[2] The low-pressure valve section is configured to be fully closed when the high-pressure side valve body and the low-pressure side valve body are arranged on one side by the position control means. The control valve for the variable displacement compressor described in 1.

3. The control valve for a variable displacement compressor according to claim 1, further comprising biasing means for biasing only the low-pressure side valve body of the high-pressure side valve body and the low-pressure side valve body to the other side.