JP2005133556A - Control valve for variable displacement compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a caulked tightening part of a yoke of solenoid in a control valve of a variable displacement compressor into a waterproofing structure. <P>SOLUTION: In a part tightened with a resin-made housing 22 for a connector receiving an external signal by caulking a tip 27 of the yoke 20 onto an inner side in the radial direction, a plate 26 forming a magnetic circuit between the yoke 20 of the solenoid and a core 16 as the housing 22 is insert-molded to cover the inner side in the radial direction except an outer peripheral fringe part of a face on its outer side by a seal part 29, and the tip 27 of the yoke 20 is caulked to apply on the seal part 29. Since the tip 27 of the yoke 20 adheres closely to the seal part 29, a metallic part of the plate 26 is not exposed to improve waterproof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a control valve for a variable capacity compressor, and in particular, can control a capacity of a refrigerant gas that is provided in a variable capacity compressor that compresses a refrigerant gas that circulates in a refrigeration cycle of a vehicle air conditioner. The present invention relates to a control valve for a variable capacity compressor.

  Since the compressor used for compressing the refrigerant in the refrigeration cycle of the air conditioner for automobiles uses the engine as a drive source, the rotational speed control cannot be performed. Therefore, a variable capacity compressor capable of changing the compression capacity of the refrigerant is used in order to maintain an appropriate cooling capacity without being restricted by the rotational speed of the engine.

  In such a variable capacity compressor, a compression piston is connected to a swing plate attached to a shaft that is rotationally driven by an engine, and the stroke of the piston is changed by changing the angle of the swing plate. The discharge amount, that is, the capacity of the compressor is changed.

  The angle of the oscillating plate is continuously changed by introducing a part of the compressed refrigerant into the sealed crank chamber, changing the pressure Pc in the crank chamber, and changing the balance of pressure applied to both surfaces of the piston. It is changing.

  The pressure Pc in the crank chamber of the variable capacity compressor generally controls the flow rate of the refrigerant introduced from the discharge chamber into the crank chamber by forming a refrigerant passage between the discharge chamber and the crank chamber of the variable capacity compressor. The control valve can be changed by the control valve. This control valve includes a valve portion that controls opening and closing of a refrigerant passage between the discharge chamber and the crank chamber, and a solenoid that can set the valve portion so that the variable displacement compressor has a predetermined discharge capacity by an external signal (For example, refer to Patent Document 1).

The solenoid includes a plunger and a core arranged in a direction in which the valve body of the valve portion opens and closes, an electromagnetic coil arranged around the plunger and the core and capable of changing a relative position of the plunger with respect to the core by an external signal, And a yoke that is arranged so as to cover the electromagnetic coil and constitutes a solenoid case. The yoke has a shape in which one end thereof extends radially inward to the vicinity of the plunger so as to form a magnetic circuit with the plunger. On the other hand, the other end of the yoke is provided with a housing for a connector for receiving a spring that urges the plunger shaft in a direction away from the core and receiving an external signal. This housing is usually made of a resin, and a metal plate for forming a magnetic circuit between the yoke and the core is inserted. The housing is fastened to the yoke by caulking the other end of the yoke and engaging the outer periphery of the plate.
JP 2001-295759 A (paragraph numbers [0015] to [0019], FIG. 1)

  In a conventional control valve of a variable displacement compressor, a yoke of a solenoid and a housing are fastened by caulking the yoke and engaging with a plate embedded in the housing. For this reason, there is a problem that rust is generated because the metal plate is exposed. Moreover, although the housing is formed by insert molding and the plate is embedded, there is a problem that it is difficult to mold the housing because water may enter from the insert portion.

  The present invention has been made in view of these points, and an object of the present invention is to provide a control valve for a variable capacity compressor with improved waterproofness in a caulking fastening portion of a yoke.

  In the present invention, in order to solve the above problem, in a control valve of a variable capacity compressor comprising a valve portion for controlling the pressure in the crank chamber and a solenoid for setting the operation value thereof, the yoke and the core of the solenoid, And a connector housing in which the plate is inserted and molded with a resin so as to cover the inner side in the radial direction excluding the outer peripheral edge of the outer surface of the plate with a seal portion. The yoke and the housing are fastened by caulking the inside of the yoke so that the tip of the yoke straddles the seal portion over the outer peripheral edge of the plate. A control valve for a variable displacement compressor is provided.

  According to such a control valve of the variable capacity compressor, the yoke and the housing are fastened by caulking the inside of the yoke so that the tip of the yoke overlaps the seal portion. Thereby, since the plate is surrounded by the seal portion and the yoke formed integrally with the housing, the metal portion is not exposed to the outside, and the occurrence of rust can be prevented. In addition, by crimping the tip of the yoke so as to overlap the seal portion, the tip of the yoke and the seal portion are brought into close contact with each other, so that waterproofness can be improved.

  In the control valve of the variable capacity compressor of the present invention, a seal portion is formed integrally with the housing of the connector, and the housing and the yoke are fastened by caulking inward so that the tip of the yoke overlaps and closely contacts the seal portion. Since it did in this way, the metal part of a plate is not exposed and the waterproof structure which water does not infiltrate can be achieved simultaneously, and there exists an advantage that reliability can be improved with a simple structure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a control valve of a variable displacement compressor according to the first embodiment, and FIG. 2 is an enlarged sectional view of a main part of the control valve of the variable displacement compressor according to the first embodiment. .

  This capacity control valve includes a valve section 1, a solenoid 2, and a diaphragm 3 of a pressure-sensitive member disposed between them, and when the valve section 1 is installed in a variable capacity compressor (not shown), the valve section 1 discharges. Each of the chamber and the crank chamber is connected to a refrigerant passage communicating with the chamber, and a space for receiving pressure by the diaphragm 3 is connected to a refrigerant passage communicating with the suction chamber.

  The valve unit 1 is provided with a port 5 at one end in the longitudinal direction of the body 4 and connected to the discharge chamber of the variable capacity compressor for receiving the discharge pressure Pd. The side of the body 4 is connected to the crank chamber of the variable capacity compressor. A port 6 is provided for supplying a controlled and controlled pressure Pc to the crank chamber. A valve seat 7 is formed integrally with the body 4 between the port 5 and the port 6, and a ball-shaped valve body 8 is provided on the side of the port 5 that receives the discharge pressure Pd facing the valve seat 7. Has been placed. The valve body 8 is biased by a spring 9 in a direction to be seated on the valve seat 7. The spring 9 is received by an adjustment screw 10 screwed into the port 5, and the load of the spring 9 is adjusted by the screwing amount of the adjustment screw 10. A strainer 11 is attached to the tip of the body 4 where the port 5 is open. The valve body 8 is also in contact with the upper end portion of the shaft 12 that extends upward in the figure through the valve hole and is held by the body 4 so as to be slidable in the axial direction.

  Below the figure of the body 4 is formed a port 13 that communicates with the suction chamber of the variable capacity compressor and receives the suction pressure Ps. The suction pressure Ps is sandwiched between the body 4 and the solenoid 2 at the outer periphery. It is made to be detected by the diaphragm 3. In the space where the suction pressure Ps is introduced, a disk 14 is disposed so as to contact the center of the diaphragm 3, and the lower end of the shaft 12 is in contact with the disk 14.

  The solenoid 2 has a sleeve 15, and a core 16 is fixed to the lower end portion thereof by press-fitting. A plunger 17 is slidably disposed in the sleeve 15 between the core 16 and the diaphragm 3. An electromagnetic coil 19 wound around a bobbin 18 is disposed outside the sleeve 15, and the outside is surrounded by a yoke 20. The upper end of the yoke 20 in the drawing is fastened to the lower end of the body 4 by caulking.

  One end of a shaft 21 disposed through the core 16 is press-fitted into the plunger 17. The other end of the shaft 21 is supported by a bearing portion 23 disposed in the housing 22. The shaft 21 is also provided with a spring receiving portion 24 and urges the plunger 17 to abut against the diaphragm 3 by a spring 25 disposed between the spring receiving portion 24 and the bearing portion 23.

  In the housing 22, a portion that protects the outer periphery of the bobbin 18, a portion that accommodates the bearing portion 23 and the spring 25, and a connector portion are integrally formed of resin. Further, a plate 26 is inserted into the housing 22. The plate 26 forms a magnetic circuit between the yoke 20 and the core 16, and the outer peripheral edge portion is in contact with the yoke 20 and the inner peripheral edge portion is in contact with the core 16.

  The housing 22 and the yoke 20 are fastened by caulking. As shown in an enlarged view of the fastening portion in FIG. 2, the plate 26 is an opposing surface on which the tip 27 of the yoke 20 is located by caulking of the yoke 20, and is an annular groove radially inward from the outer peripheral edge portion. The groove 28 is formed integrally with the housing 22 in a state in which the seal portion 29 protrudes from the surface of the plate 26. Thus, when the yoke 20 is caulked, the tip 27 of the yoke 20 is bent inward in the radial direction so as to grip the outer peripheral edge of the plate 26. At this time, the tip 27 of the yoke 20 comes into close contact with the seal portion 29 by crushing the seal portion 29 protruding from the surface of the plate 26. Since the housing 22 is a portion protruding outside the variable capacity compressor when the control valve is mounted on the variable capacity compressor, the caulking fastening portion between the yoke 20 and the housing 22 is exposed to the outside air. However, since the metal plate 26 is not exposed, the plate 26 does not rust, and the metal contact portion between the yoke 20 and the plate 26 is not exposed. It is possible to prevent the occurrence of electric corrosion.

  In the control valve having the above configuration, when the maximum current is supplied to the electromagnetic coil 19 and the maximum suction force is generated between the plunger 17 and the core 16, the valve body 8 is controlled by the biasing force of the spring 9. It is seated on the seat 7 and the valve is closed. On the other hand, when the electromagnetic coil 19 is not energized, the urging force of the spring 25 acts on the plunger 17 and the shaft 12 is pressed upward through the diaphragm 3 and the disk 14. The seat 7 is lifted by a predetermined distance. Moreover, the lift amount of the valve body 8 can be freely set by changing the current supplied to the electromagnetic coil 19.

  Here, when the controlled current is supplied to the electromagnetic coil 19 and the valve body 8 is set to a predetermined lift amount, for example, when the suction pressure Ps changes so as to decrease, the diaphragm 3 moves upward in the figure. Displacement drives the valve body 8 in the valve opening direction, and the lift amount increases. As a result, the flow rate of the refrigerant supplied to the crank chamber is increased and the internal pressure Pc is increased, so that the discharge capacity is decreased and the suction pressure Ps is increased. On the contrary, when the suction pressure Ps is increased, the diaphragm 3 is displaced downward in the drawing to move the valve body 8 in the valve closing direction, and the lift amount is decreased. As a result, the flow rate of the refrigerant supplied to the crank chamber decreases and the internal pressure Pc decreases, so the discharge capacity increases and an attempt is made to lower the suction pressure Ps. Therefore, this control valve senses the suction pressure Ps and controls the pressure Pc in the crank chamber so that the suction pressure Ps of the variable capacity compressor becomes constant.

  FIG. 3 is a longitudinal sectional view showing a control valve of a variable capacity compressor according to the second embodiment, and FIG. 4 is an enlarged cross-sectional view of a main part of the control valve of the variable capacity compressor according to the second embodiment. . 3 and 4, elements having the same or equivalent functions as those shown in FIGS. 1 and 2 are given the same reference numerals, and detailed descriptions thereof are omitted.

  This control valve has a configuration in which instability at the time of caulking between the yoke 20 and the housing 22 is eliminated as compared with the control valve of the variable capacity compressor according to the first embodiment. That is, the plate 26 also has an annular groove 28 on the surface facing the tip 27 of the yoke 20 by caulking of the yoke 20 and radially inward from the outer peripheral edge portion. The seal portion 29 is formed integrally with the housing 22 in a state of protruding from the surface of the plate 26. A gasket 30 is disposed between the seal portion 29 and the tip 27 of the yoke 20.

  Here, by crimping the yoke 20, the tip 27 of the yoke 20 is bent radially inward so as to grip the outer peripheral edge of the plate 26 with the gasket 30 interposed therebetween, and the yoke 20 and the housing 22 are fastened together. Is done. At this time, the gasket 30 is in close contact between the tip 27 of the yoke 20 and the outer peripheral edge portion of the plate 26. Further, in the seal portion 29 protruding from the surface of the plate 26, the seal portion is crushed by crushing it. 29 is in close contact with 29. As a result, the exposed portion of the plate 26 is eliminated, so that the plate 26 is not rusted, and the metal contact portion between the yoke 20 and the plate 26 is not exposed. Can be prevented. Since the gasket 30 is interposed in the caulking fastening portion, the non-uniformity of caulking processing in the circumferential direction of the tip 27 of the yoke 20 can be absorbed by the gasket 30, so that the yoke 20 and the housing 22 can be absorbed. Can be stably fastened.

  In this embodiment, the function of the bearing portion 23 is integrally formed by the housing 22 to reduce the number of parts. Further, the operation of this control valve is the same as that of the variable displacement compressor according to the first embodiment, and is therefore omitted.

  In the above-described embodiment, the case where the present invention is applied to a control valve of a variable displacement compressor that senses the suction pressure Ps has been described in detail as an example. However, the valve portion that controls the pressure Pc in the crank chamber and its operating value are described. In other types of control valves including solenoids that perform the above-described setting, the invention can be similarly applied to a caulking fastening portion between a yoke and a housing that is exposed to the atmosphere when the variable displacement compressor is mounted.

It is a longitudinal cross-sectional view which shows the control valve of the variable capacity compressor which concerns on 1st Embodiment. It is a principal part expanded sectional view of the control valve of the variable capacity compressor which concerns on 1st Embodiment. It is a longitudinal cross-sectional view which shows the control valve of the variable capacity compressor which concerns on 2nd Embodiment. It is a principal part expanded sectional view of the control valve of the variable capacity compressor which concerns on 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve part 2 Solenoid 3 Diaphragm 4 Body 5 Port 6 Port 7 Valve seat 8 Valve body 9 Spring 10 Adjustment screw 11 Strainer 12 Shaft 13 Port 14 Disc 15 Sleeve 16 Core 17 Plunger 18 Bobbin 19 Electromagnetic coil 20 Yoke 21 Shaft 22 Housing 23 Bearing portion 24 Spring receiving portion 25 Spring 26 Plate 27 Tip 28 Groove 29 Seal portion 30 Gasket

Claims (4)

In a control valve of a variable capacity compressor having a valve section for controlling the pressure in the crank chamber and a solenoid for setting the operation value thereof,
A plate disposed between the yoke and core of the solenoid to form a magnetic circuit;
A connector housing in which the plate is inserted and molded with resin so as to cover the radially inner side excluding the outer peripheral edge of the outer surface of the plate with a seal portion;
The yoke and the housing are fastened by crimping the yoke so that the tip of the yoke straddles the seal portion over the outer peripheral edge of the plate. Control valve for capacity compressor.   2. The variable capacity compression according to claim 1, wherein the plate has an annular groove into which the seal portion formed integrally with the housing is fitted on an opposing surface on which the tip of the yoke is located. Machine control valve.   The control valve of a variable capacity compressor according to claim 2, wherein the seal portion is formed so that a portion fitted in the groove protrudes from a surface of the plate. 2. The control valve for a variable capacity compressor according to claim 1, wherein a gasket is interposed between the outer peripheral edge of the plate and the seal portion and the tip of the yoke.

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