KR20150128587A

KR20150128587A - Control valve

Info

Publication number: KR20150128587A
Application number: KR1020150063586A
Authority: KR
Inventors: 마사아키 토네가와; 료타 스가무라
Original assignee: 가부시키가이샤 테지케
Priority date: 2014-05-09
Filing date: 2015-05-07
Publication date: 2015-11-18
Also published as: JP2015214914A; JP6368897B2

Abstract

<Task>
A sealing structure provided at the outer peripheral portion of the control valve is realized at low cost.
[Solution]
The valve body 2 includes a body 16 having a valve 16 and a port 14 through which refrigerant is introduced and a valve portion provided in a main passage for connecting the port 16 and the port 14 ); And a filter member 15 mounted on the outer circumferential surface of the body 5 so as to cover the ports 14 and 16 and regulating entry of foreign matter into each port. The filter member (15) is a tubular resin frame assembled to be inserted into the body (5) on the outside and having ring grooves (92) around the outer periphery thereof; A metal or resin mesh integrally provided in the frame and regulating the passage of foreign matter; And an O-ring 94 fitted in the ring-shaped groove 92 of the frame and exhibiting a sealing function when the valve body 2 is accommodated in the mounting hole of the object device.

Description

The control valve {CONTROL VALVE}

The present invention relates to a control valve suitable for controlling the flow of fluid through a target device.

A control valve for controlling the flow of the working fluid is used for an apparatus that performs control using a working fluid. For example, a variable capacity compressor (referred to as "compressor" in the following description) capable of varying the discharge capacity of a refrigerant is used in an air conditioner for an automotive vehicle so as to maintain a constant cooling capacity regardless of the number of revolutions of the engine . In order to control the capacity of the compressor, a solenoid-driven control valve is generally used (see, for example, Patent Document 1).

In this compressor, a compression piston is connected to a swing plate mounted on a rotary shaft driven by an engine, and the discharge amount of the refrigerant is adjusted by changing the stroke of the piston by changing the angle of the swing plate. The angle of the swing plate is continuously changed by introducing a part of the discharged refrigerant into the hermetically closed crank chamber and changing the balance of pressure applied to both surfaces of the piston. The housing of the compressor is provided with a mounting hole for communicating with the refrigerant passage, and the control valve is mounted to the mounting hole so as to be inserted from the front end side (the side opposite to the solenoid). The control valve controls at least one of a refrigerant flow rate introduced into the crank chamber from the discharge chamber and a refrigerant flow rate derived from the crank chamber to the suction chamber to change the discharge capacity of the compressor.

Japanese Patent Application Laid-Open No. 2001-349278

However, such a mounting hole of the compressor has a shape in which the diameter gradually increases from the inside toward the opening side in order to seal between the plurality of refrigerant passages. The control valve basically has a shape in which the outer diameter gradually increases from the insertion direction leading end side toward the rear end side so as to be complementary to the mounting hole. This is because by providing a sealing structure using the stepped portion, it is possible to prevent the external leakage of the refrigerant through the gap between the mounting hole and the control valve, and to prevent the external leakage of the refrigerant, . In order to realize such a sealing structure, the control valve is provided with a sealing member such as an O-ring between the ports on the outer periphery of the body. That is, on the outer peripheral surface of the body, a ring-shaped recess is provided around the periphery, and an O-ring is fitted in the recess.

However, when such a configuration is adopted, the outer diameter of the body must be increased to secure the formation of the recess. Alternatively, in order to reduce the size of the body, the portion other than the lumbar region should be formed to have a small diameter. In other words, the body is usually obtained by molding a metal material, and providing the recess has been a factor of increasing the material cost and processing cost of the metal material.

SUMMARY OF THE INVENTION The present invention has been conceived to solve such a problem, and its object is to realize a sealing structure provided at an outer peripheral portion of a control valve at low cost.

One embodiment of the present invention is a control valve that is constructed by assembling a valve body and a solenoid in an axial direction and is accommodated from a valve body side in a mounting hole formed in a target device for controlling a flow of fluid flowing through the target device. The valve body includes a body including a first port through which fluid is introduced and a second port through which fluid is introduced, and a valve portion provided in an internal passage connecting the first port and the second port; And a filter member mounted on the outer peripheral surface of the body so as to cover at least the first port and regulating the entry of foreign matter into the first port. The filter member includes a tubular resin frame assembled to be inserted into the body at the outer side and provided with a recess for fitting around the outer circumference thereof; A metal or resin mesh integrally provided in the frame and regulating the passage of foreign matter; And a sealing ring that is fitted in the recess of the frame and exerts a sealing function when the valve body is housed in the mounting hole of the object device.

According to this embodiment, the concave portion is provided on the outer peripheral surface of the filter member, and the sealing ring is fitted to the concave portion. By using the filter member in the sealing structure as described above, a metal material having a small outer diameter can be used as the material of the body. It is not necessary to increase the amount of cutting of the body for the recess. It is possible to form concave portions at the same time as the frame is formed by injection molding of a resin material or the like, whereby the yield of the resin material can be maintained favorably. As a result, a sealing structure provided at the outer peripheral portion of the control valve can be realized at low cost.

According to the present invention, a sealing structure provided at the outer peripheral portion of the control valve can be realized at low cost.

1 is a cross-sectional view showing a configuration of a control valve according to a first embodiment.
2 is a partially enlarged cross-sectional view corresponding to the upper half of Fig.
3 is a view showing the operation of the control valve.
4 is a view showing the operation of the control valve.
5 is a partial cross-sectional view showing a state in which the control valve is mounted on the compressor.
6 is a view showing a specific configuration of the filter member.
7 is a view schematically showing a process of attaching the filter member.
8 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the second embodiment.
9 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the third embodiment.
10 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the fourth embodiment.
11 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the fifth embodiment.
12 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the sixth embodiment.
13 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the seventh embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. On the other hand, in the following description, for convenience, the state shown in the drawing may be referred to as a positional relation of each structure.

[First Embodiment]

1 is a cross-sectional view showing the configuration of a control valve according to the first embodiment.

The control valve 1 is configured as an electromagnetic valve for controlling a discharge capacity of a variable capacity compressor (abbreviated as "compressor"), not shown, as a target device installed in a refrigeration cycle of an automotive air conditioner. This compressor compresses the refrigerant flowing in the refrigeration cycle and discharges it as gas refrigerant of high temperature and high pressure. The gas refrigerant is condensed by a condenser (external heat exchanger), and further adiabatically expanded by the expansion device to become a low-temperature, low-pressure mist type refrigerant. The low-temperature low-pressure refrigerant evaporates by the evaporator, and the vehicle interior air is cooled by the latent heat of evaporation. The refrigerant evaporated by the evaporator is returned to the compressor again to circulate the refrigeration cycle. The compressor includes a rotation shaft that is rotationally driven by an automobile engine, and a compression piston is connected to a swing plate mounted on the rotation shaft. The discharge amount of the refrigerant is adjusted by changing the stroke of the piston by changing the angle of the swing plate. The control valve 1 controls the flow rate of the refrigerant introduced from the discharge chamber of the compressor to the crank chamber (corresponding to the "control chamber"), thereby changing the angle of the swash plate, and thus the discharge capacity of the compressor. On the other hand, the control chamber of the present embodiment is formed of a crank chamber, but in the modified example, it may be a pressure chamber separately provided in the crank chamber or outside the crank chamber.

The control valve 1 is configured as a so-called Ps sensing valve for controlling the flow rate of the refrigerant introduced into the crank chamber from the discharge chamber so as to maintain the suction pressure Ps (corresponding to the "sensing pressure" . The control valve 1 is constituted by integrally assembling the valve body 2 and the solenoid 3 together. The valve body 2 includes a main valve for opening and closing a refrigerant passage for introducing a part of discharge refrigerant into the crank chamber at the time of operation of the compressor and a so-called bleed valve for bleeding the refrigerant in the crank chamber into the suction chamber valve which functions as a valve. The solenoid 3 drives the main valve in the opening and closing direction to adjust its opening degree and controls the refrigerant flow rate introduced into the crank chamber. The valve body 2 includes a cylindrical body 5 having a stepped portion, a main valve and a sub-valve provided inside the body 5, and a power generating unit that generates a force against the solenoid force Element 6 and the like. The power element 6 functions as a "pressure reducing portion ".

The body 5 is provided with ports 12, 14, 16 from the upper end thereof. The port 12 functions as a "suction chamber communication port " and communicates with the suction chamber of the compressor. The port 14 functions as a "crank chamber communication port" (corresponding to a "control chamber communication port") and communicates with the compressor crank chamber. The port 16 functions as a "discharge chamber communication port " and communicates with the discharge chamber of the compressor. Further, the port 16 functions as a "first port " and the port 14 functions as a" second port ". And an end member 13 is fixed so as to close the upper opening of the body 5. [ The lower end of the body (5) is connected to the upper end of the solenoid (3).

A main passage which is an internal passage for communicating the port 16 and the port 14 and a sub passage which is an internal passage for communicating the port 14 and the port 12 are formed in the body 5. [ A main valve is provided in the main passage, and a sub valve is provided in the sub passage. That is, the control valve 1 has a configuration in which the power element 6, the sub valve, the main valve, and the solenoid 3 are disposed in order from one end side. The main passage is provided with a main valve hole (20) and a main valve seat (22). A sub-valve hole (32) and a sub-valve seat (34) are provided in the sub passage.

The port 12 communicates the suction chamber with the operation chamber 23 partitioned on the upper portion of the body 5. [ The power element 6 is disposed in the operation chamber 23. [ The port 16 introduces the refrigerant of the discharge pressure Pd from the discharge chamber. A main valve chamber (24) is provided between the port (16) and the main valve hole (20), and a main valve is disposed. The port 14 draws the refrigerant having the crank pressure Pc toward the crank chamber via the main valve at the time of normal operation of the compressor and the crank pressure Pc discharged from the crank chamber at the time of starting the compressor Refrigerant is introduced. A sub valve chamber (26) is provided between the port (14) and the main valve hole (20), and a sub valve is disposed. The port 12 introduces the refrigerant having the suction pressure Ps at the normal operation of the compressor while drawing the refrigerant having the suction pressure Ps through the sub valve toward the suction chamber at the start of the compressor.

That is, when the main valve is opened, the port 16 functions as an "introduction port" for introducing the refrigerant from the discharge chamber, while the "port 14" functions as an "outlet port" for drawing the refrigerant toward the crank chamber. . On the other hand, when the sub valve is opened, the port 14 functions as an "introduction port" for introducing the refrigerant from the crank chamber, while the "port 12" . The port 14 functions as an " introduction lead-in port "for introducing or deriving the refrigerant according to the open / close state of the main valve and the sub valve.

The body 5 is provided with a cylindrical filter member 15 (functioning as a "foreign matter penetration regulating member") so as to cover both the port 14 and the port 16 from the outside. The filter member 15 includes a mesh for suppressing the intrusion of foreign matter into the inside of the body 5 and restricts the entry of foreign matter into the port 16 when the main valve is opened, Thereby restricting the entry of the foreign object into the port 14. The structure of the filter member 15 and its periphery will be described in detail later.

A main valve hole 20 is provided between the main valve chamber 24 and the sub valve chamber 26 and a main valve seat 22 is formed at the lower end opening end thereof. A guide hole (25) is provided between the port (14) and the operation chamber (23). A guide hole 27 is provided in a lower portion of the body 5 (opposite to the main valve hole 20 of the main valve chamber 24). In the guide hole 27, a cylindrical main valve body 30 is slidably inserted.

The upper half of the main valve body 30 is reduced in diameter to form a partitioning portion 33 which passes through the main valve hole 20 and divides the inside and outside. The stepped portion formed in the middle portion of the main valve body 30 is a valve forming portion 35 that is detachably attached to the main valve seat 22 to open and close the main valve. The main valve body 30 is detachably attached to the main valve seat 22 at the side of the main valve chamber 24 to open and close the main valve to adjust the flow rate of the refrigerant flowing from the discharge chamber to the crank chamber. The upper portion of the partition portion 33 is enlarged in a tapered shape toward the upper side and the sub valve seat 34 is formed at the upper end opening portion thereof. The sub valve seat (34) functions as a movable valve seat displaced together with the main valve body (30).

On the other hand, in the guide hole 25, a cylindrical valve sub-valve body 36 having a bottom portion is slidably inserted. And an internal passage of the sub valve body 36 serves as a sub valve hole 32. [ This internal passage allows the sub valve chamber 26 and the operation chamber 23 to communicate with each other by opening the sub valve. The sub valve body (36) and the sub valve seat (34) are arranged to face each other in the axial direction. And the sub valve is opened and closed by the sub valve body (36) being detached from the sub valve chamber (26) to the sub valve seat (34).

In addition, an operating rod 38 is formed along the axis of the body 5. The upper end of the operating rod 38 is operatively connected to the power element 6 through the sub-valve body 36. The lower end of the operating rod 38 is operatively connected to the plunger 50 of the solenoid 3, which will be described later. The upper half of the operating rod 38 passes through the main valve body 30 while gradually reducing its diameter, and supports the sub valve body 36 downwardly therefrom.

A ring-shaped spring bearing 40 is inserted and supported in the axial middle portion of the operating rod 38. A spring 42 (functioning as a "biasing member") for biasing the main valve body 30 in the closing direction of the main valve is disposed between the main valve body 30 and the spring bearing 40. On the other hand, between the power element 6 and the sub valve body 36, the sub valve body 36 is biased in the closing direction of the sub valve, while the main valve body 30 is biased in the opening direction of the main valve (Serving as a "biasing member").

The power element 6 includes a bellows 45 which senses a suction pressure Ps to be displaced and generates a force against the solenoid force due to the displacement of the bellows 45. [ This counter-force is also transmitted to the main valve body 30 through the sub-valve body 36. The relief of the refrigerant from the crank chamber to the suction chamber is blocked by the sub valve member 36 being seated on the sub valve seat 34 and closing the sub valve. In addition, relief of the refrigerant from the crank chamber to the suction chamber is permitted by opening the sub valve away from the sub valve seat 34 of the sub valve body 36.

On the other hand, the solenoid 3 includes a cylindrical core 46 having a stepped portion; A cylindrical sleeve 48 having a bottom assembled to seal the bottom opening of the core 46; A cylindrical plunger 50 received in the sleeve 48 and having a stepped portion disposed axially opposite to the core 46; A cylindrical bobbin 52 inserted outwardly into the core 46 and the sleeve 48; An electromagnetic coil 54 wound around the bobbin 52 to generate a magnetic circuit by energization; A cylindrical case 56 provided so as to cover the electromagnetic coil 54 from the outside; An end member 58 configured to seal the lower end opening of the case 56; And a collar 60 made of a magnetic material embedded in the end member 58 below the bobbin 52. [ On the other hand, the core 46, the case 56 and the collar 60 constitute a yoke. The body 5, the end member 13, the core 46, the case 56 and the end member 58 form the body of the entire control valve 1. [

The valve body 2 and the solenoid 3 are fixed by pressing the lower end of the body 5 into the upper opening of the core 46. [ A pressure chamber (28) is formed between the core (46) and the main valve body (30). On the other hand, the operation rod 38 is inserted so as to pass through the center of the core 46 in the axial direction. The suction pressure Ps introduced into the pressure chamber 28 is guided to the inside of the sleeve 48 through the communication passage 62 formed by the distance between the operation rod 38 and the core 46. [

The spring 44 also functions as an off spring for biasing the core 46 and the plunger 50 in a direction separating them from each other. The operation rod 38 is connected in a coaxial manner to each of the sub valve body 36 and the plunger 50, but is not fixed. That is, the upper portion of the operation rod 38 is movably engaged with the sub valve body 36, and the lower end portion thereof is movably engaged with the plunger 50. Since the spring 44 (off spring) is provided between the sub valve body 36 and the power element 6, the operation rod 38 is press-fitted into each of the sub valve body 36 and the plunger 50 And there is no problem even if it is not fixed by such as. Rather, by eliminating such press fitting, the machining properties of the sub-valve body 36, the actuating rod 38, and the plunger 50 and their assemblability can be improved. On the other hand, in the modified example, the operation rod 38 may be fixed to at least one of the sub valve body 36 and the plunger 50 by press fitting or the like.

The operating rod 38 is supported by the plunger 50 from below and is operatively connected to the main valve body 30, the sub valve body 36 and the power element 6. The operating rod 38 suitably transmits the solenoidal force which is the suction force of the core 46 and the plunger 50 to the main valve body 30 and the sub valve body 36. [ On the other hand, a driving force (also referred to as a "reduced driving force") caused by the expansion and contraction of the power element 6 is loaded on the working rod 38 so as to oppose the solenoid force. That is, in the control state of the main valve, a force adjusted by the solenoid force and the reduced pressure driving force acts on the main valve body 30 to properly control the opening of the main valve. The operation rod 38 is displaced relative to the body 5 against the urging force of the spring 44 so as to close the main valve so that the sub valve body 36 ) To push up the sub valve. Even when the main valve is being controlled, when the suction pressure Ps becomes considerably high, the operating rod 38 is displaced relative to the body 5 against the biasing force of the bellows 45 to close the main valve Subsequently, the sub valve body 36 is pushed up to open the sub valve. Thereby exerting the bleed function.

Sleeve 48 is made of a non-magnetic material. A plurality of communication grooves 66 parallel to the axis are provided on a side surface of the plunger 50 and a communication hole 68 communicating with the inside and the outside is provided at the lower portion of the plunger 50. The suction pressure Ps is guided to the back pressure chamber 70 through the gap between the plunger 50 and the sleeve 48 even if the plunger 50 is positioned at the bottom dead center as shown in the figure.

A pair of connection terminals 72 connected to the electromagnetic coil 54 extend from the bobbin 52 and extend through the end member 58 to the outside. In FIG. 1, only one of the pair is shown for convenience of explanation. The end member 58 is mounted so as to seal the entire structure in the solenoid 3 contained in the case 56 from below. The end member 58 is formed by mold molding (injection molding) of a resin material having corrosion resistance, and the resin material is also filled in the gap between the case 56 and the electromagnetic coil 54. As described above, the resin material fills the gap between the case 56 and the electromagnetic coil 54 to easily transfer heat generated in the electromagnetic coil 54 to the case 56, thereby enhancing the heat radiation performance. The distal end portion of the connection terminal 72 is drawn out from the end member 58 and connected to an external power source (not shown).

2 is a partially enlarged cross-sectional view corresponding to the upper half of Fig.

On the sliding surface of the main valve body 30 and the guide hole 27, a labyrinth seal 74 having a plurality of ring-shaped grooves for suppressing the flow of the refrigerant is provided. The spring bearing 40 is supported by the stepped portion 78 (functioning as a "first engagement portion") of the operating rod 38 and is disposed in the pressure chamber 28.

The inner diameter of the lower half of the main valve body 30 is enlarged, and the spring 42 is arranged to be accommodated in the enlarged diameter portion. With this configuration, since the point of contact between the spring 42 and the main valve body 30 is located closer to the main valve chamber 24 side than the center of the sliding portion in the guide hole 27, 30 are stably supported on the spring 42 in the form of a so-called balancing toy. As a result, it is possible to prevent or suppress the occurrence of hysteresis due to shaking when the main valve body 30 is opened and closed.

The sub-valve body (36) has a through hole (43) that passes through the center in the axial direction. The upper portion of the operating rod 38 extends through the through hole 43 to the power element 6. [ The sub valve element 36 is supported downward by a step portion 79 (functioning as a "second engagement portion") on the upper side of the operation rod 38. A plurality of internal passages 39 for communicating the internal passageway 37 of the main valve body 30 and the operation chamber 23 are formed around the insertion hole 43 of the sub valve body 36 have. The internal passage 39 extends parallel to the insertion hole 43 and passes through the sub valve body 36. On the other hand, in the state in which the sub valve member 36 is seated on the sub valve seat 34, the upper surface of the spring bearing 40 is supported by the lower surface of the main valve body 30 at least at a predetermined The positions of the stepped portions 78, 79 are set so as to be spaced apart from each other by an interval L. The predetermined interval L functions as a so-called "clearance ".

When the solenoid force is increased, the operation rod 38 may be displaced relative to the main valve body 30 to push up the sub valve body 36. Thereby, the sub valve can be opened by separating the sub valve member 36 and the sub valve seat 34 from each other. The solenoid force can be directly transmitted to the main valve body 30 in a state in which the spring bearing 40 and the main valve body 30 are engaged with each other, It is possible to pressurize with a great force. This configuration functions as a lock release mechanism for releasing the lock when the main valve body 30 is locked by the intrusion of foreign matter into the sliding portions of the main valve body 30 and the guide hole 27. [

The main valve chamber 24 is formed as a pressure chamber which is coaxial with the body 5 and has a larger diameter than the main valve hole 20. [ Therefore, a relatively large space is formed between the main valve and the port 16, so that the flow rate of the refrigerant flowing through the main passage can be sufficiently secured when the main valve is opened. Similarly, the sub valve chamber 26 is also formed as a pressure chamber which is coaxial with the body 5 and has a diameter larger than that of the main valve hole 20. Therefore, a relatively large space is also formed between the sub valve and the port 14. As shown in the figure, the upper end of the main valve body 30 and the lower end of the sub valve body 36 are set so as to be positioned at the center of the sub valve chamber 26. That is, the movable range of the main valve body 30 is set so that the sub valve seat 34 is always positioned in the sub valve chamber 26, and the sub valve is opened and closed in the sub valve chamber 26. Therefore, when the sub-valve is opened, the flow rate of the refrigerant flowing through the sub-passage can be sufficiently secured. That is, the bleed function can be effectively exerted.

The power element 6 is constituted such that the upper end opening of the bellows 45 is closed by the first stopper 82 and the lower end opening is closed by the second stopper 84. [ The bellows 45 functions as a " pressure reducing member ", and the first stopper 82 and the second stopper 84 each function as a "base member ". The first stopper 82 is formed integrally with the end member 13. The second stopper 84 is formed in a cylindrical shape having a bottom by press-forming a metal material, and has a flange portion 86 extending radially outwardly in a lower end opening portion thereof. The bellows 45 is hermetically welded to the lower surface of the end member 13 at the upper end of the bellows-like body, and the lower end opening of the bellows 45 is hermetically welded to the upper surface of the flange portion 86. The inside of the bellows 45 is a sealed reference pressure chamber S and a bellows 45 is provided between the end member 13 and the flange portion 86 on the inside of the bellows 45, A spring 88 is disposed. The reference pressure chamber S is in a vacuum state in the present embodiment.

The end member (13) is a fixed end of the power element (6). The set load of the power element 6 (the set load of the spring 88) can be adjusted by adjusting the amount of the end member 13 to be pushed into the body 5. The central portion of the first stopper 82 extends downward toward the inside of the bellows 45 and the central portion of the second stopper 84 extends upward toward the inside of the bellows 45 so that the bellows 45 ). And the upper end of the operating rod 38 is engaged with the second stopper 84. [ The bellows 45 elongates or contracts in the axial direction (opening and closing directions of the main valve and the sub valve) corresponding to the differential pressure between the suction pressure Ps of the operating chamber 23 and the reference pressure of the reference pressure chamber S. [ The driving force in the opening direction is given to the main valve body 30 in accordance with the displacement of the bellows 45. [ The second stopper 84 comes into contact with the first stopper 82 to be locked so that the shrinkage of the bellows 45 is restricted.

In the present embodiment, the effective hydraulic diameter A of the bellows 45, the effective hydraulic pressure B (sealing portion diameter) in the main valve of the main valve body 30, and the sliding portion diameter C (the diameter of the sealing portion) and the sliding portion diameter D (the diameter of the sealing portion) of the sub-valve body 36 are set equal to each other. Therefore, when the main valve body 30 and the power element 6 are operatively connected to each other, the discharge pressure Pd, the crank pressure Pc (Pc) acting on the combined body of the main valve body 30 and the sub valve body 36, And the suction pressure Ps are canceled. As a result, in the control state of the main valve, the main valve body 30 is opened and closed in accordance with the suction pressure Ps received by the power chamber 6 in the operating chamber 23. [ That is, the control valve 1 functions as a so-called Ps sensing valve.

In this embodiment, the diameters B, C, and D are made the same, and the inner passage of the valve body (main valve body 30 and sub valve body 36) The influence of the operating pressure Pd, Pc, Ps can be canceled. That is, the pressure in the front and rear (upper and lower in the figure) of the combined body of the sub valve body 36, the main valve body 30, the operating rod 38 and the plunger 50 can be set to the same pressure (suction pressure Ps) Whereby the pressure cancellation is realized. Thereby, the diameter of each valve body can be set independently of the diameter of the bellows 45, and the degree of design freedom is high. Therefore, in the modified example, diameters B, C, and D may be the same, and the effective hydraulic pressure diameter A may be different from these diameters. That is, the effective pressure-receiving diameter A of the bellows 45 may be smaller than the diameters B, C, and D, or may be larger than the diameters B, C,

A partition wall 90 that vertically separates the port 12 and the port 14 protrudes radially outward from the outer surface of the body 5. The outer diameter of the partition wall 90 is larger than the inner diameter of the filter member 15 and smaller than the outer diameter of the filter member 15. The filter member 15 is inserted into the body 5 so as to be inserted into the body 5 but is held between the lower surface of the partition wall 90 and the upper surface of the core 46 Crystals are formed, and the rattling is prevented.

A ring-shaped groove 92 (functioning as a "fitting recess "," first recessed portion ") is provided circumferentially on the outer peripheral surface of the axial middle portion of the filter member 15. An O-ring 94 (serving as a "first seal ring") for sealing is fitted in the ring-shaped groove 92. An annular groove 96 is also provided on the outer circumferential surface of the partition wall 90 so as to surround the O-ring 98 (serving as a "second seal ring") for sealing. Further, the ring-shaped groove 100 is also provided around the upper end of the core 46 in the vicinity of the upper end thereof, and an O-ring 102 for sealing (which functions as a "third seal ring") is inserted. These O-rings 94, 98, and 102 regulate the leakage of the refrigerant when the control valve 1 is mounted in the mounting hole of the compressor, and the details thereof will be described later.

Next, the operation of the control valve will be described.

Figs. 3 and 4 are views showing the operation of the control valve. Fig. FIG. 2 already described shows the minimum capacity operation state of the control valve. Fig. 3 shows a state when the bleed function is operated at the time of starting the control valve. Fig. 4 shows a relatively stable control state. Hereinafter, with reference to Fig. 1, a description will be made with reference to Figs. 2 to 4 as appropriate.

As shown in Fig. 2, when the solenoid 3 is not energized in the control valve 1, that is, when the automotive air conditioner is not operating, suction force acts between the core 46 and the plunger 50 Do not. On the other hand, the biasing force of the spring 44 is transmitted to the main valve body 30 through the sub valve body 36. [ As a result, the main valve body 30 is separated from the main valve seat 22 and the main valve is fully opened. At this time, the power element 6 does not substantially function. The sub-valve maintains the closed state.

3, when a starting current is supplied to the electromagnetic coil 54 of the solenoid 3 at the time of starting the automotive air conditioner, the suction pressure Ps is increased to the valve opening pressure (Also referred to as "sub-valve opening pressure"), the sub-valve is opened. That is, the solenoid force is applied to the urging force of the spring 42, and the sub-valve body 36 is pushed up integrally. As a result, the sub valve body 36 is separated from the sub valve seat 34 and the sub valve is opened, and the bleed function is efficiently exhibited. In this operation process, the main valve body 30 is pushed up by the urging force of the spring 42 to sit on the main valve seat 22. As a result, the main valve is closed. That is, after the main valve is closed to regulate the introduction of discharge refrigerant into the crank chamber, the sub valve is opened to quickly relieve the refrigerant in the crank chamber into the suction chamber. As a result, the compressor can be started quickly. On the other hand, as to the "sub-valve opening pressure", when the set pressure Pset to be described later is changed in accordance with the environment in which the vehicle is placed, it changes correspondingly.

When the current value supplied to the solenoid 3 is within the control current value range of the main valve, the opening degree of the main valve is autonomously adjusted so that the suction pressure Ps becomes the set pressure Pset set by the supply current value. In the control state of this main valve, as shown in Fig. 4, the sub valve body 36 is seated on the sub valve seat 34, and the sub valve remains closed. On the other hand, since the suction pressure Ps is relatively low, the bellows 45 is elongated and the main valve body 30 is operated to adjust the opening degree of the main valve. At this time, the main valve body 30 is closed by the force in the opening direction by the spring 44, the force in the closing direction by the spring 42, the solenoid force in the closing direction, The force in the opening direction by the element 6 stops at a balanced valve lift position.

When the refrigerating load becomes large and the suction pressure Ps becomes higher than the set pressure Pset, for example, the bellows 45 is contracted and the main valve body 30 relatively displaces upward (closing direction) . As a result, the opening degree of the main valve is reduced, and the compressor operates to increase the discharge capacity. As a result, the suction pressure Ps is lowered. On the other hand, when the refrigerating load becomes small and the suction pressure Ps becomes lower than the set pressure Pset, the bellows 45 is extended. As a result, the power element 6 biases the main valve body 30 in the opening direction to increase the opening degree of the main valve, and the compressor operates so as to reduce the discharge capacity. As a result, the suction pressure Ps is maintained at the set pressure Pset. On the other hand, if the suction pressure Ps becomes significantly higher than the set pressure Pset, it is assumed that the main valve is closed and the sub-valve is opened depending on the height of the suction pressure Ps. However, since there is a pressure range (blank deceleration) until the sub-valve is opened after the main valve is closed, it is prevented that the main valve and the sub-valve are unstably opened and closed.

When the load on the engine increases while the normal control is being performed and the load on the air conditioner is to be reduced, the solenoid 3 of the control valve 1 is switched from on to off. The main valve body 30 is separated from the main valve seat 22 by the urging force of the spring 44 so that the main valve body 30 is separated from the main valve seat 22 by the urging force of the spring 44, It becomes an expanded state. At this time, since the sub valve body 36 is seated on the sub valve seat 34, the sub valve is closed. Thereby, the refrigerant of the discharge pressure Pd introduced into the port 16 from the discharge chamber of the compressor passes through the main valve in the expanded state, and flows from the port 14 to the crank chamber. Accordingly, the crank pressure Pc is increased, and the compressor is operated at the minimum capacity.

Next, the foreign matter penetration control structure and the sealing structure of the control valve will be described in detail.

5 is a partial cross-sectional view showing a state in which the control valve is mounted on the compressor. 6 is a view showing a specific configuration of a filter member, wherein (A) is a perspective view and (B) is a longitudinal sectional view. 7 is a view schematically showing a process of attaching the filter member.

5, a mounting hole 112 for mounting the control valve 1 is provided in the housing 110 of the compressor. The housing 110 is provided with a communication passage 114 communicating with the suction chamber, a communication passage 116 communicating with the crank chamber and a communication passage 118 communicating with the discharge chamber, . The mounting holes 112 are enlarged in diameter toward the opening edge from the inside thereof, and the communication passages 114, 116, and 118 are sequentially opened from the inner end.

The control valve 1 is inserted into the mounting hole 112 from its front end side and its rear end is fixed to the mounting hole 112 through the washer 104. The port 12 is disposed so as to face the communication path 114 and the port 14 is opposed to the communication path 116 and the port 16 is disposed to face the communication path 118. [ The above-described O-rings 98, 94, and 102 are fitted on the outer circumferential surface of the control valve 1 so that sealability between the communication paths, between the ports, and inside and outside of the mounting hole 112 . That is, the sealability between the communication path 114 and the communication path 116 is ensured by the O-ring 98 and the sealing property between the port 12 and the port 14 is secured. The sealability between the communication path 116 and the communication path 118 is secured by the O-ring 94 and the sealing property between the port 14 and the port 16 is secured. An O-ring 106 is also fitted to the side surface of the end member 58 so that the sealing performance of the inside and outside of the mounting hole 112 is secured by the O-rings 102 and 106.

As shown in the figure, the filter member 15 is disposed so as to overlie a pressure chamber communicating with the communication passage 116 and a pressure chamber communicating with the communication passage 118. The filter member (15) restricts foreign matter from entering the port (14) when the foreign matter is contained in the refrigerant introduced from the crank chamber. The filter member 15 also restricts foreign matter from entering the port 16 when the foreign matter is contained in the refrigerant introduced from the discharge chamber.

6A, the filter member 15 includes a cylindrical frame 120 having a stepped portion provided with a plurality of openings on its side face, a cylindrical body 120 integrally provided on an inner peripheral portion of the frame 120, Shaped meshes 121 and 122, respectively. The above-mentioned O-ring 94 is fitted in the outer peripheral surface of the frame 120 in the central portion in the axial direction.

As shown in Fig. 6 (B), the frame 120 is made of a resin material, and the lower half portion thereof is slightly smaller in diameter than the upper half portion. That is, the frame 120 includes a partition wall portion 124 provided at the center in the axial direction, a first holding portion 126 connected to the upper portion of the partition wall portion 124, And a second holding portion 128 provided for the second holding portion. Four openings 130 are provided at equal intervals on the side of the first holding portion 126. That is, the upper end of the first holding portion 126 is a ring-shaped upper portion 132 connected in a circular ring shape, and the ring-shaped upper portion 132 and the partition wall portion 124 are connected by the four supporting pillars 134 have. These support pillars 134 are provided at intervals of 90 degrees with respect to the center of the filter member 15. Similarly, four opening portions 136 are provided at equal intervals on the side of the second holding portion 128. That is, the lower end of the second holding portion 128 is a ring-shaped upper portion 138 connected in a circular ring shape, and the ring-shaped upper portion 138 and the partition portion 124 are connected by the four support pillars 140 have. The support pillars 140 are provided at intervals of 90 degrees with respect to the center of the filter member 15.

The meshes 121 and 122 are each formed by rounding a band-shaped resin mesh into a cylindrical shape, and are integrally formed with the frame 120 by insert molding of a resin material using a predetermined mold. As shown in the drawing, the mesh 121 is provided so as to cover the four openings 130 while being stably held in the form embedded in the vicinity of the inner circumferential surface of the first holding portion 126. The mesh 122 is provided so as to cover the four openings 136 while being stably held in the form embedded in the vicinity of the inner circumferential surface of the second holding portion 128. The meshes 121 and 122 do not directly come into contact with the outer peripheral surface of the body 5 by configuring the inner circumferential surface of the frame 120 to be located slightly inside the meshes 121 and 122 as shown in the figure.

The inner circumferential portion 142 of the partition wall portion 124 of the frame 120 (more specifically, the portion located between the meshes 121 and 122 in the axial direction in the inner circumferential portion thereof) Is slightly smaller than the outer diameter of the mounting surface of the mounting surface (5). The lower end opening 144 of the frame 120 is slightly reduced in diameter and its inner diameter is slightly smaller than the outer diameter of the mounting surface of the body 5. [ These constitute a press-in amount when the filter member 15 is mounted on the body 5. [ The inner circumferential portion 142 located in the axial middle portion of the filter member 15 is press-fitted into the outer circumferential surface of the body 5, 16 and the port 14 is blocked.

As shown in Fig. 2, the outer diameter of the body 5 is maximized at the partition wall 90, but the outer diameter of the filter member 15 is larger than that. The outer diameter of the valve body 2 is maximized at the position of the O-ring 94, and is made smaller toward the upper and lower sides. That is, the radial thickness of the portion where the O-ring 94 having the maximum diameter is provided in the valve body 2 is supplemented by the filter member 15, so that the metal portion of the body 5 is suppressed to be small have.

7, the filter member 15 is mounted on the body 5 before the body 5 is mounted on the solenoid 3, in the process of assembling the control valve 1. As shown in Fig. That is, after the valve body 2 and the solenoid 3 are individually assembled, both are assembled. The power element 6, the sub valve body 36, the main valve body 30 and the O-ring 98 are assembled to the body 5 while the O-ring 94 is mounted The filter member 15 is assembled from the lower side (on the side of the connection part of the body 5 with the solenoid 3). The filter member 15 can be stably fixed (press-fitted) to the predetermined position of the body 5 because of the dimensional relationship between the body 5 and the filter member 15 described above. The control valve 1 shown in Fig. 1 is obtained by press-fitting the lower end portion of the valve body 2 with the filter member 15 assembled into the upper end portion of the core 46 as described above. On the other hand, in the state in which the control valve 1 is assembled as described above, the filter member 15 is stably supported in such a manner that it is sandwiched between the partition wall 90 and the core 46, as described above.

As described above, in the present embodiment, the ring-shaped groove 92 is provided on the outer peripheral surface of the filter member 15, and the O-ring 94 is fitted in the ring-shaped groove 92. As described above, by using the filter member 15 in a part of the sealing structure, a metal material having a small outer diameter can be used as the material of the body 5. Further, it is not necessary to increase the amount of cutting of the body 5 for the ring-shaped groove 92. Furthermore, in the present embodiment, since the ring-shaped groove 92 is formed simultaneously with the formation of the frame 120 by injection molding of the resin material, the yield of the resin material can be kept good. As a result, a sealing structure provided at the outer peripheral portion of the control valve 1 can be realized at low cost.

[Second Embodiment]

8 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the second embodiment. Hereinafter, differences from the first embodiment will be mainly described. 8, the same components as those in the first embodiment are denoted by the same reference numerals.

In the control valve 201 of the present embodiment, the structure of the filter member and its surroundings is different from that of the first embodiment. The control valve 201 is constituted by assembling the valve body 202 and the solenoid 3 integrally. In the present embodiment, the partition wall 290 is elongated in the axial direction of the body 205, and the port 14 is opened in the partition wall 290.

The filter member 215 is mounted on the body 205 so as to cover only the port 16 from the outside. That is, the filter member 215 has the structure as described above except for the portion covering the port 14 in the filter member 15 of the first embodiment. The filter member 215 is formed by integrally providing a mesh 122 with respect to the frame 220. The frame 220 is stably supported in such a manner that it is sandwiched and held between the partition wall 290 and the core 46 (yoke).

The ring shaped groove 92 is provided on the outer circumferential surface of the filter member 215 and the O ring 94 is fitted in the ring shaped groove 92. For this reason, as in the first embodiment, a metal material having a small outer diameter can be used as the material of the body 205. As a result, a sealing structure provided at the outer peripheral portion of the control valve 201 can be realized at low cost.

On the other hand, in the present embodiment, the filter member for regulating the entry of the foreign matter into the port 14 is not provided when the sub valve is opened. This is because the refrigerant flowing from the crank chamber is less likely to contain foreign matter, which is more problematic than the refrigerant flowing from the discharge chamber, so that the installation of the filter member to the crank chamber communication port is omitted. Even in such a case, the above-described sealing structure can be applied to the filter member provided in the discharge chamber communication port.

[Third embodiment]

9 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the third embodiment. Hereinafter, differences from the first embodiment will be mainly described. In Fig. 9, substantially the same constituent parts as those in the first embodiment are denoted by the same reference numerals.

In the control valve 301 of this embodiment, the structure of the filter member and its surroundings is different from that of the first embodiment. The control valve 301 is constituted by integrally assembling the valve body 302 and the solenoid 303 together. In the present embodiment, the O-ring 102 sealing the port 16 and the atmosphere is sandwiched between the filter member 315 and the O- The filter member 315 is formed by integrally providing meshes 121 and 122 with respect to the frame 320. [

The outer diameter of the frame 320 is maximized at the lower end 318 and the ring shaped groove 100 (functioning as a "third recess") is provided around the lower end 318, (Third seal ring) is inserted. That is, the frame 320 is longer in the axial direction than the frame 120 of the first embodiment, because the lower end 318 is provided. Conversely, the core 346 (the yoke) is shorter in the axial direction than the core 46 of the first embodiment, as it does not include the mounting portion of the O-ring 102. [

A ring-shaped groove 310 having a small width is provided on the outer circumferential surface of the body 305 located on the inner side of the O-ring 94, and an O-ring 312 is inserted. The O-ring 312 blocks the flow of the refrigerant through the gap between the intermediate portion 317 of the filter member 315 and the body 305 and ensures sealing between the port 16 and the port 14 And functions as a "fourth seal ring (sealing member) ". Further, a ring-shaped groove 306 having a small width is provided on the outer circumferential surface of the body 305 located on the inner side of the O-ring 102, and an O-ring 308 is inserted. The O-ring 308 prevents the refrigerant from flowing through the gap between the lower end 318 of the filter member 315 and the body 305 and ensures sealing between the port 16 and the pressure chamber 28 And functions as a "fifth seal ring (sealing member) ". The intermediate portion 317 and the lower end portion 318 of the filter member 315 are not press-fitted into the body 305. [

In the present embodiment, ring-shaped grooves 92, 100 are provided on the outer peripheral surface of the filter member 315, and O-rings 94, 102 are sandwiched therebetween. Therefore, a metal material having a small outer diameter can be used as the material of the body 305, and the core 346 made of a magnetic material can be made smaller. As a result, a sealing structure provided at the outer peripheral portion of the control valve 301 can be realized at low cost.

[Fourth Embodiment]

10 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the fourth embodiment. Hereinafter, differences from the first embodiment will be mainly described. In Fig. 10, the same components as those in the first embodiment are denoted by the same reference numerals.

In the control valve 401 of the present embodiment, the structure of the filter member, the power element, and the periphery thereof is different from that of the first embodiment. The control valve 401 is constituted by assembling the valve body 402 and the solenoid 403 integrally. In this embodiment, an O-ring 98 for sealing between the port 12 and the port 14 is fitted in the filter member 415. [ The filter member 415 is constituted by integrally providing the meshes 421 and 122 with respect to the frame 420.

The frame 420 has a first holding portion 426 located above the partition wall portion 124 in the axial direction and has a ring shaped groove 96 (called a "second concave portion" And an O-ring 98 is interposed therebetween. Thereby, the partition wall 490 formed in the body 405 is smaller in outer diameter than the partition wall 90 of the first embodiment. The frame 420 is stably supported in such a manner that it is held by the partition wall 490 and the core 446 (yoke).

The body 405 is constructed by assembling the first body 407 and the second body 408 in the axial direction. The second body 408 has a cylindrical shape and is press-fitted into the upper opening of the first body 407 in a coaxial shape. The filter member 415 is mounted on the outer peripheral surface of the first body 407. The port 12 is provided in the second body 408. An operation chamber 23 is formed in the inside of the port 12, and a power element 406 is accommodated. An end member 413 is press-fitted into the upper end of the second body 408.

The power element 406 includes a first stopper 82, a second stopper 84, a bellows 445, and a spring 88. The first stopper 82 is not formed integrally with the end member 413 but is accommodated in the bellows 445. [ The first stopper 82 has a flange portion 83 extending radially outward at its upper end and the flange portion 83 is in contact with the bottom of the bellows 445. The upper end of the bellows body 445 is closed and the lower end opening is fixed to the flange portion 86 of the second stopper 84. [ A spring 88 is disposed between the flange portion 83 and the flange portion 86. The end of the bellows 445 opposite to the flange portion 86 is held in contact with the end member 413. At the center of the end member 413, there is provided an engagement hole 416 to be fitted to the center of the end of the bellows 445.

In the present embodiment, ring-shaped grooves 92, 96 are provided on the outer circumferential surface of the filter member 415, and O-rings 94, 98 are sandwiched therebetween. Therefore, a metal material having a small outer diameter can be used as the material of the body 405. Particularly, since the outer diameter of the partition wall 490 can be reduced, the material cost can be further reduced as compared with the first embodiment. As a result, a sealing structure provided at the outer peripheral portion of the control valve 401 can be realized at low cost.

[Fifth Embodiment]

11 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the fifth embodiment. Hereinafter, differences from the third embodiment will be mainly described. In Fig. 11, components substantially the same as those in the third embodiment are denoted by the same reference numerals.

In the control valve 301 of the present embodiment, the structure of the filter member and its surroundings is different from that of the third embodiment. The control valve 501 is constituted by integrally assembling the valve body 502 and the solenoid 303 together. An O-ring 98 for sealing between the port 12 and the port 14 and an O-ring 102 for sealing between the port 16 and the atmosphere are both fitted in the filter member 515 have. The filter member 515 is formed by integrally providing meshes 121 and 122 with respect to the frame 520. [

The frame 520 has a first holding portion 526 which is located above the partition wall portion 124 in the axial direction and a ring shaped groove 96 is provided around the distal end portion 527, Ring 98 is inserted. Thereby, the partition wall 590 formed in the body 505 is smaller in outer diameter than the partition wall 90 of the first embodiment. The frame 520 is stably supported in such a manner that it is sandwiched and held between the partition wall 590 and the core 346.

In this embodiment, ring-shaped grooves 92, 96, and 100 (functioning as a "first recessed portion", a "second recessed portion", and a "third recessed portion") are provided on the outer peripheral surface of the filter member 515, And O-rings 94, 98, and 102 are inserted into them. Therefore, a metal material having a small outer diameter can be used as the material of the body 505, and the core 346 made of a magnetic member can be made smaller. As a result, a sealing structure provided at the outer peripheral portion of the control valve 501 can be realized at low cost.

[Sixth Embodiment]

12 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the sixth embodiment. Hereinafter, differences from the first embodiment will be mainly described. On the other hand, in Fig. 12, substantially the same constituent parts as those in the first embodiment are denoted by the same reference numerals.

In the control valve 601 of the present embodiment, the structure of the filter member and the periphery thereof is slightly different from that of the first embodiment. The control valve 601 is constituted by integrally assembling the valve body 602 and the solenoid 3 together. The filter member 615 is formed by integrally forming meshes 121 and 122 with respect to the frame 620 and is assembled to the outer peripheral surface of the body 605. [

The frame 620 is provided with a first holding portion 126 above the partition wall portion 624 and a second holding portion 128 below the partition wall portion 624. On the lower surface of the second holding portion 128, a ring-shaped projection 628 is provided. In addition, a tapered surface 625 whose diameter slightly increases toward the upper side is provided on the inner peripheral surface of the partition wall portion 624. On the other hand, at the position corresponding to the partition wall portion 624 of the body 605, an edge 610 formed by a stepped shape formed by decreasing the diameter downward is provided.

With this structure, when the body 605 and the solenoid 3 are assembled with the filter member 615 sandwiched therebetween, since the tip of the projection 628 is collapsed, the frame 620 and the core 46 Respectively. Thereby, the rattling of the filter member 615 is effectively prevented. Further, the edge 610 fits into the tapered surface 625, so that the frame 620 and the body 605 come into close contact with each other. The flow of the refrigerant between the port 14 and the port 16 through the gap between the body 605 and the filter member 615 is blocked.

The ring shaped groove 92 is provided on the outer circumferential surface of the filter member 215 and the O ring 94 is fitted in the ring shaped groove 92. Therefore, as in the first embodiment, a metal material having a small outer diameter can be used as the material of the body 605. As a result, a sealing structure provided at the outer peripheral portion of the control valve 601 can be realized at low cost.

[Seventh Embodiment]

13 is a partially enlarged cross-sectional view corresponding to the upper half of the control valve according to the seventh embodiment. Hereinafter, differences from the first embodiment will be mainly described. In Fig. 13, components substantially the same as those in the first embodiment are denoted by the same reference numerals.

In the control valve 701 of the present embodiment, the structure of the filter member and its surroundings is different from that of the first embodiment. The control valve 701 is constituted by assembling a valve body 702 and a solenoid 703 integrally. The sub valve body 736 is press-fitted into the upper end of the operating rod 38. The press-in position of the sub-valve body 736 is regulated by the step portion 79 on the upper side of the operating rod 38. A spring is not provided between the sub valve body 736 and the power element 6 and a spring 44 is disposed between the core 746 and the plunger 50 (not shown).

The filter member 715 is constituted by integrally providing a mesh 722 with respect to the frame 720 and is assembled to the outer peripheral surface of the body 705. [ The mesh 722 is made of a single resin mesh and insert-molded to the frame 720. The swollen portion 724 is formed in the central portion of the frame 720 in the radial direction and slightly bulges radially inwardly and the swollen portion 724 contacts the port 14 and the port 16 on the outer peripheral surface of the body 705, As shown in Fig. The flow of the refrigerant between the port 14 and the port 16 through the gap between the body 705 and the filter member 715 is blocked.

The ring shaped groove 92 is provided on the outer circumferential surface of the filter member 715 and the O ring 94 is fitted in the ring shaped groove 92. Therefore, as in the first embodiment, a metal material having a small outer diameter can be used as the material of the body 705. As a result, a sealing structure provided at the outer peripheral portion of the control valve 701 can be realized at low cost. Further, since the mesh 722 is one piece, the filter member 715 can be easily formed.

Although the preferred embodiments of the present invention have been described above, it is needless to say that the present invention is not limited to the specific embodiments described above, and various modifications are possible within the scope of the technical idea of the present invention.

In the first embodiment, as shown in Fig. 2, Fig. 6, and the like, a structure is provided in which the press-in portion is provided with a sealing function by pressing the axial middle portion (inner circumferential portion 142) For example. In a modified example, the sealing function may be provided by disposing a sealing ring between the middle of the axial direction of the filter member and the body.

In the above embodiment, the mesh of the filter member is made of a resin mesh, but it may be made of a metal mesh. Even in this case, the metal mesh may be insert-molded when the frame is injection-molded.

In the above embodiment, the so-called input control type control valve for adjusting the flow rate of the refrigerant introduced into the crank chamber from the discharge chamber of the variable displacement compressor is shown. However, in the modified example, the flow rate of the refrigerant led from the crank chamber to the suction chamber is adjusted So-called extraction control type control valve. In this case, the filter member of the above embodiment is arranged so as to cover the crank chamber communication port.

The above embodiment exemplifies a so-called Ps sensing valve in which the power element 6 is disposed in the operating chamber 23 filled with the suction pressure Ps and the suction pressure Ps is directly sensed . In the modified example, the power element is disposed in the capacity chamber in which the crank pressure Pc is filled, and the crank pressure Pc is canceled, thereby substantially sensing the suction pressure Ps and operating Ps detection valve.

In the above embodiment, the example in which the bellows 45 is employed as the pressure-reducing member constituting the power element 6 is shown, but a diaphragm may be employed. In this case, a plurality of diaphragms may be connected in the axial direction in order to secure a required operation stroke as the pressure-reducing member.

In the above embodiment, a spring (coil spring) is exemplified as the urging member with respect to the springs 42, 44, 88, but it goes without saying that an elastic material such as rubber or resin or an elastic mechanism such as a leaf spring may be employed .

In the above embodiment, the reference pressure chamber S in the bellows 45 is in a vacuum state. However, the atmosphere may be filled in, or a predetermined gas to be a reference may be filled. Alternatively, any one of the discharge pressure Pd, the crank pressure Pc, and the suction pressure Ps may be filled. The power element may be configured to operate by detecting the pressure difference between the inside and the outside of the bellows. In the above-described embodiment, the pressure Pd, Pc, Ps directly received by the main valve body is canceled, but the pressure of at least one of them may not be canceled.

In the above-described embodiment, an example is shown in which O-rings 94, 98, and 102 having a circular sectional shape are employed as sealing rings for sealing between the housing of the compressor and the control valve. In the modified example, a sealing ring (packing or the like) having a non-circular sectional shape may be employed for at least one of the O-rings 94, 98, and 102.

In the above embodiment, the suction chamber communication port, the crank chamber communication port, and the discharge chamber communication port are provided in order from one end side (solenoid opposite side) of the body, and the discharge chamber communication port is disposed close to the solenoid. In a modified example, other port arrangements may be employed. For example, the crank chamber communication port may be arranged close to the solenoid, or the suction chamber communication port may be arranged close to the solenoid.

In the above embodiment, a control valve having a main valve and a sub-valve and exhibiting a bleed function by the sub-valve is illustrated. In a modified example, the filter member and its sealing structure may be applied to a control valve having only a main valve and not having a bleed function.

Needless to say, the control valve of the above-described embodiment is not limited to the compressor as long as the target device needs to control the flow of the fluid flowing in the housing. It goes without saying that the configuration of the above embodiment is applicable to a control valve provided with a fluid introduction port and an introduction port. That is, in the above-described embodiment, the sealing structure using the above-described filter member is applied to a specific control valve, that is, a control valve that controls the variable capacity compressor. In the modified example, the control valve other than the variable displacement compressor may be applied as a control valve to be introduced as a target device. For example, a valve for controlling hot water and cold water, a valve for controlling the hydraulic pressure, and the like.

On the other hand, the present invention is not limited to the above-described embodiments and modifications, and can be embodied by modifying the constituent elements without departing from the gist. Various inventions may be formed by suitably combining a plurality of constituent elements disclosed in the above-described embodiment or modified examples. In addition, some of the constituent elements may be deleted from the entire constituent elements shown in the above-mentioned embodiment or modified examples.

1: Control valve
2:
3: Solenoid
5: Body
12, 14: Port
15: Filter element
16: Port
20: Main valve hole
22: Main valve seat
23: working room
24: Main valve chamber
25: Guide hole
26: Sub valve chamber
27: Guide hole
28: Pressure chamber
30: Main valve body
32: Sub valve hole
34: Sub-valve seat
36: Sub valve body
38: Operation rod
42, 44: spring
46: Core
50: plunger
90:
92: ring shaped groove
94: O-ring
96: ring shaped groove
98: O ring
100: ring shaped groove
102, 106: O-ring
110: Housing
112: Mounting hole
114, 116, 118:
120: frame
121, 122: mesh
124:
126: first holding portion
128: second holding portion
201: Control valve
202: valve body
205: Body
215:
220: frame
290:
301: Control valve
302: valve body
303: Solenoid
305: Body
306: ring shaped groove
308: O ring
315: Filter element
320: frame
346: core
401: Control valve
402: valve body
403: Solenoid
405: Body
415: Filter element
420: frame
421: Mesh
446: core
490:
501: Control valve
502: valve body
505: Body
515: Filter element
520: frame
601: Control valve
602:
605: Body
610: Edge
615: Filter element
620: frame
625: Tapered surface
628: projection
701: Control valve
702:
703: Solenoid
705: Body
715: Filter element
720: frame
722: Mesh
736: Sub-valve body
746: core

Claims

A control valve comprising a valve body and a solenoid assembled in an axial direction and accommodated in a mounting hole formed in a target device for controlling the flow of fluid flowing through the target device from the valve body side,
Wherein the valve body comprises:
A body including a first port through which a fluid is introduced and a second port through which fluid is introduced, wherein a valve is provided in an internal passage connecting the first port and the second port,
And a filter member mounted on an outer circumferential surface of the body so as to cover at least the first port and regulating entry of foreign matter into the first port,
Wherein the filter member comprises:
A tubular resin frame assembled so as to be inserted into the body at the outer side and provided with a recessed portion around its periphery;
A metal or resin mesh integrally provided in the frame and regulating the passage of foreign matter; And
And a seal ring fitted to the recess of the frame and exhibiting a sealing function when the valve body is received in the mounting hole of the object device.

The method according to claim 1,
Wherein the filter member is assembled to the body so that the filter member is inserted into the body from the side of the connection portion with the solenoid outside before the body and the solenoid are assembled.

3. The method according to claim 1 or 2,
And a control valve for the variable capacity compressor which changes the discharge capacity of the variable capacity compressor which compresses the refrigerant introduced into the suction chamber and discharges from the discharge chamber by adjusting the flow rate of the refrigerant introduced into the control chamber from the discharge chamber,
Wherein the body includes a discharge chamber communication port communicating with the discharge chamber as the first port and a control chamber communication port communicating with the control chamber as the second port.

The method of claim 3,
Wherein the body includes a suction chamber communication port communicating with the suction chamber, a main passage communicating with the discharge chamber communication port as the internal passage, and the control chamber communication port, and a communication passage communicating with the control chamber communication port and the suction chamber communication port A sub-
A main valve is provided as the valve portion for opening and closing the main passage,
A sub-valve for opening and closing the sub-passage is provided,
When the main valve is opened, the discharge chamber communication port functions as an introduction port for introducing the refrigerant from the discharge chamber, while the control chamber communication port functions as a discharge port for drawing the refrigerant toward the control chamber ,
When the sub valve is opened, the control chamber communication port functions as an introduction port for introducing the refrigerant from the control chamber, while the suction chamber communication port functions as a derivation port for drawing the refrigerant toward the suction chamber ,
Wherein the filter member is mounted on the body so as to cover both the discharge chamber communication port and the control chamber communication port and restricts entry of foreign objects into the discharge chamber communication port when the main valve is opened, The opening of the control chamber communication port is restricted,
Wherein a flow of the refrigerant between the discharge chamber communication port and the control chamber communication port on the outside of the frame is blocked by the seal ring.

5. The method of claim 4,
Wherein the filter member is configured to cover both the discharge chamber communication port and the control chamber communication port by a single mesh.

5. The method of claim 4,
The axial direction intermediate portion of the filter member is press-fitted into the outer circumferential surface located between the discharge chamber communication port and the control chamber communication port in the body so that the discharge chamber communication port and the discharge chamber communication port, And the flow of coolant between the control chamber communication ports is cut off.

5. The method of claim 4,
A sealing member is disposed between an outer circumferential surface of the body located between the discharge chamber communication port and the control chamber communication port and an axial intermediate portion of the filter member, And the flow of the refrigerant between the discharge chamber communication port and the control chamber communication port is cut off.

5. The method of claim 4,
A first recessed portion as a recessed portion positioned between the discharge chamber communication port and the control chamber communication port and a second recessed portion positioned between the control chamber communication port and the suction chamber communication port are provided on the outer circumferential surface of the frame And,
Further comprising a second seal ring fitted to the second recess to exhibit a sealing function when the valve body is received in the mounting hole of the object device.

The method of claim 3,
A first recessed portion as a recessed portion positioned between the discharge chamber communication port and the control chamber communication port and a third recessed portion located nearer to the solenoid than the first recessed portion are provided on the outer circumferential surface of the frame,
Further comprising a third seal ring fitted to the third recessed portion and exhibiting a sealing function when the valve body is received in the mounting hole of the target device.

3. The method according to claim 1 or 2,
A partition wall having an outer diameter larger than an inner diameter of the frame is provided on an outer peripheral surface of the body so as to protrude,
Wherein the filter member is restricted in its axial movement by being held between the yoke of the solenoid and the partition wall.

3. The method according to claim 1 or 2,
Wherein an edge of a stepped shape is provided on an outer circumferential surface positioned between the first port and the second port in the body and the edge is pierced on the inner circumferential surface of the filter member, And the flow of the refrigerant between the first port and the second port is interrupted.