JP4170779B2 - Pressure control valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pressure control valve, and more particularly to a pressure control valve for controlling a compressor of an automotive air conditioner that controls a valve portion by receiving pressure of a flexible diaphragm.
[0002]
[Prior art]
In an automotive air conditioner, since the rotational speed of the engine that is the power source of the compressor is not constant, it is necessary to perform control so that the refrigerating capacity is constant regardless of the rotational speed of the engine. In response to this requirement, a variable capacity compressor that makes the discharge capacity of the refrigerant variable is generally used. In order to change the discharge capacity, the pressure in the crank chamber is controlled by a swash plate type variable displacement compressor, and a pressure control valve is used to control the pressure in the crank chamber.
[0003]
The pressure control valve includes an internal variable control system (for example, see Patent Document 1) that mechanically controls only in the compressor, and an external variable control that is electrically controlled based on the calculation results of various sensor outputs. There is a method. Here, a control valve for a variable capacity compressor that performs control of the internal variable control system will be described.
[0004]
FIG. 5 is a cross-sectional view showing a configuration example of a conventional internal variable control pressure control valve used in a variable capacity compressor.
The pressure control valve includes a valve portion 1 and a power element 2 that drives and controls the valve portion 1. The valve unit 1 communicates with the discharge chamber of the variable capacity compressor via a strainer 4 provided at the tip of the body 3 to thereby introduce a port 5 for introducing the discharge pressure Pd, and a crank chamber of the variable capacity compressor. And a port 6 that outputs a controlled pressure, that is, a crank chamber pressure Pc, and a port 7 that communicates with the suction chamber of the variable capacity compressor and receives the suction pressure Ps. A ball valve body 8 is disposed in a refrigerant flow path communicating with the port 6 of the crank chamber pressure Pc so as to be seated on the valve seat formed integrally with the body 3 from the port 5 side of the discharge pressure Pd. The ball valve body 8 is biased in the valve closing direction by a spring 9, and the spring load of the spring 9 is adjusted by an adjustment screw 10 screwed to the port 5. In addition, a shaft 11 that is in contact with the ball valve body 8 and is controlled and driven is held at the axial position of the body 3 so as to be able to advance and retract in the axial direction.
[0005]
The power element 2 is arranged so as to hold the lower housing 12, the upper housing 13, the diaphragm 14 of the pressure-sensitive member that partitions the space surrounded by the lower housing 12 and the upper housing 13, and the central portion of the diaphragm 14 from both sides. The two discs 15 and 16 and a spring 17 that urges the disc 16 toward the valve portion 1 side. The disc 15 on the valve portion 1 side is in contact with the end surface of the shaft 11 extending through a communication hole 18 that communicates the port 7 for suction pressure Ps and the diaphragm chamber on the valve portion 1 side.
[0006]
Here, the valve portion 1 and the power element 2 are assembled separately and screwed into a state shown in FIG. 5 by a screw portion 19 screwed into the lower end portion of the lower housing 12 and the upper end portion of the body 3. .
[0007]
FIG. 6 is an enlarged view showing a power element of a conventional pressure control valve used in a variable capacity compressor.
A diaphragm 14 is held on the outer peripheral portion of the lower housing 12 by a caulking portion 13a of the upper housing 13, and a sealed space is defined. The diaphragm 14 drives and controls the valve unit 1 by contacting the end surface of the shaft 11 shown in FIG. 5 via the disk 15 on the lower housing 12 side. The disk-shaped disk 16 has the same shape as the disk 15 and includes a bottom surface portion 16a and an outer peripheral standing portion 16b. The bottom surface portion 16a of the disk 16 is in contact with the central portion of the thin film diaphragm 14 with a predetermined area. Further, the outer peripheral upright portion 16b of the disk 16 is brought into contact with the stepped portion 13b of the inner peripheral surface of the upper housing 13 whose diameter has been increased, thereby restricting the diaphragm 14 from being excessively displaced into the sealed space. ing.
[0008]
Similarly, the disk 15 on the lower housing 12 side is also composed of a bottom surface portion 15 a and an outer peripheral standing portion 15 b, and the outer peripheral standing portion 15 b is also configured to abut on the step portion 12 a on the inner peripheral surface of the lower housing 12. The diaphragm 14 restricts excessive displacement in the direction of the valve portion 1.
[0009]
Thus, in the conventional pressure control valve, in addition to the function that the two disks 15 and 16 disposed on both sides of the diaphragm 14 receive the spring 17 or the shaft 11, the displacement of the diaphragm 14 is restricted more than necessary. It has a function to do.
[0010]
[Patent Document 1]
JP 2001-349279 A (paragraph numbers [0011] to [0014], FIG. 1)
[0011]
[Problems to be solved by the invention]
However, such a pressure control valve requires two disks of the same shape that hold the diaphragm of the pressure sensitive member from both sides. When assembling the power element, especially the disk on the valve side is troublesome to incorporate. Not only is necessary, but also because it is the same shape as the disk that receives the spring force of the spring on the opposite side of the diaphragm, it may be accidentally assembled in the reverse direction, which causes a decrease in product yield, etc. There was a problem of becoming.
[0012]
An object of the present invention is to provide a pressure control valve that simplifies a structure for restricting excessive displacement of a power element portion toward a valve portion of a diaphragm.
[0013]
[Means for Solving the Problems]
In the present invention, in order to solve the above problem, in a pressure control valve having a diaphragm-type pressure-sensitive member and a valve portion, a first housing that defines a sealed space partitioned by a flexible diaphragm; A spring disposed in the first housing for urging the diaphragm toward the valve portion; and a spring disposed between the diaphragm and the spring to displace the diaphragm in a direction away from the valve portion. The valve to be regulated and the receiving portion of the diaphragm projecting inward to a position on the valve portion side corresponding to the press contact outer peripheral portion of the disc pressed against the diaphragm by the spring are integrally formed, and the valve comprises a second housing which is to be connected to the parts of the body, and wherein the receiving portion of the second housing, the die Notched contact surfaces of Fulham pressure control valve, characterized in that provided radially are provided.
[0014]
In the pressure control valve of the present invention, excessive displacement of the diaphragm is regulated by the second housing in which the receiving portion of the diaphragm is integrally molded, so that the disc on the valve portion side is not required and the trouble of assembling is reduced. Can be eliminated. At this time, even if the diaphragm is displaced toward the valve portion and comes into contact with the receiving portion, the contact surface with the diaphragm is communicated through the notch.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. Prior to that, the related art of the present invention will be described.
FIG. 1 is a cross-sectional view showing a pressure control valve for a variable capacity compressor according to the related art .
[0016]
In FIG. 1, the same parts as those of the conventional pressure control valve (FIG. 5 ) are denoted by the same reference numerals. Here, the shape of the lower housing 20 is different from the conventional one. That is, the lower housing 20 is integrally formed with an annular inner protrusion 21 as a receiving portion for restricting the displacement of the diaphragm 14 to the valve portion 1 side.
[0017]
The surface of the inner protrusion 21 that faces the diaphragm 14 is formed in a shape corresponding to a conventional disk (disk 15 in FIG. 5 ). That is, the inner protrusion 21 corresponds to the shape of the disk 16 in the upper housing 13 and is pressed by the spring 17 to receive the suction pressure Ps of the variable capacity compressor and interlock with the shaft 11 to The receiving part which controls the stroke of the diaphragm 14 which controls movement is comprised.
[0018]
FIG. 2 is an enlarged view showing a power element of a pressure control valve according to the related art .
A communication hole 22 that is slightly larger than the diameter of the communication hole 18 of the shaft 11 is formed in the central portion of the inner protrusion 21 that constitutes the receiving portion. The shaft 11 disposed so as to pass through the communication hole 22 drives and controls the valve unit 1 by directly contacting the diaphragm 14 with an end surface thereof. Therefore, the contact surface on which the inner protrusion 21 contacts the diaphragm 14 has a ring shape, but the lower housing 20 itself can have a stroke restricting function.
[0019]
The inner protrusion 21 can prevent the diaphragm 14 from being bent more than a predetermined stroke by the spring 17 in a state where the suction pressure Ps is not introduced into the diaphragm 14. At the same time, the stroke of the ball valve body 8 and the spring 9 of the valve portion 1 can be suppressed by the inner protrusion 21.
[0020]
In this way, in this pressure control valve, the lower housing 20 itself regulates the stroke of the diaphragm 14 at the pressure contact position with the disk 16 with the diaphragm 14 interposed therebetween, and the shaft 11 passes through the hole penetrating the inner protrusion 21. Since the end of the abutment is in contact with the diaphragm 14, the disk on the valve side, which has been conventionally required, can be omitted, and the time and labor during assembly of the power element 2 can be reduced.
[0021]
FIG. 3 is a cross-sectional view showing the pressure control valve for the variable capacity compressor according to the first embodiment. 3, the same components as those of the pressure control valve shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0022]
In the pressure control valve for the variable capacity compressor according to the first embodiment, the notches 23 are provided radially on the abutting surface of the inner projection 21 of the lower housing 20 with the diaphragm 14. Thereby, even when the diaphragm 14 is in contact with the contact surface of the inner protrusion 21, the suction pressure Ps can be introduced to the entire lower surface of the diaphragm 14 through the notch 23, and the diaphragm 14 with respect to the suction pressure Ps can be introduced. The pressure receiving area can be the same as the conventional one.
[0023]
FIG. 4 is a cross-sectional view showing a pressure control valve for a variable capacity compressor according to a second embodiment. 4, the same components as those of the pressure control valve shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
[0024]
In the pressure control valve for a variable capacity compressor according to the second embodiment, a communication hole 24 is provided in the inner protrusion 21 of the lower housing 20 so as to penetrate therethrough. The communication hole 24 is formed outside the position where the diaphragm 14 contacts the inner protrusion 21, and the suction pressure Ps is applied to the lower surface of the diaphragm 14 even when the diaphragm 14 is in contact with the contact surface of the inner protrusion 21. To be able to introduce. As a result, when the suction pressure Ps is sufficiently low and the diaphragm 14 rises from when it is in contact with the inner protrusion 21, the diaphragm 14 can sense the suction pressure Ps on the entire lower surface thereof. become able to.
[0025]
【The invention's effect】
As described above, according to the pressure control valve of the present invention, the lower housing has a shape protruding inward so as to restrict the stroke of the diaphragm to the valve portion side, and the diaphragm contact surface is notched or since the communication hole are integrally formed receiving portion provided, the diaphragm 14 and keeping the breathability during contact between the inner projection 21, conventionally Russia a housing-side were required two disks supporting the diaphragm Can reduce the number of disks.
[0026]
As a result, the number of component parts is reduced, so that the labor of assembly is reduced, and in particular, the factor of the yield reduction due to the reverse assembly of the disk or the lack of parts can be reduced, so the productivity of the pressure control valve increases. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a pressure control valve for a variable capacity compressor according to the related art .
FIG. 2 is an enlarged view showing a power element of a pressure control valve according to related technology .
FIG. 3 is a cross-sectional view showing a pressure control valve for the variable capacity compressor according to the first embodiment.
FIG. 4 is a cross-sectional view showing a pressure control valve for a variable capacity compressor according to a second embodiment.
FIG. 5 is a cross-sectional view showing a configuration example of a conventional internal variable control pressure control valve used in a variable capacity compressor.
FIG. 6 is an enlarged view showing a power element of a conventional pressure control valve used in a variable capacity compressor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve part 2 Power element 3 Body 4 Strainer 5 Port 6 Port 7 Port 8 Ball valve body 9 Spring 10 Adjustment screw 11 Shaft 12 Lower housing 12a Step part 13 Upper housing 13a Caulking part 13b Step part 14 Diaphragm 15 Disc 15a Bottom part 15b Peripheral standing part 16 Disc 16a Bottom face part 16b Peripheral standing part 17 Spring 18 Communication hole 19 Screw part 20 Lower housing 21 Inner protrusion (receiving part)
22 Communication hole 23 Notch 24 Communication hole

Claims (2)

In a pressure control valve having a diaphragm-type pressure-sensitive member and a valve portion,
A first housing defining a sealed space partitioned by a flexible diaphragm;
A spring disposed in the first housing and biasing the diaphragm toward the valve portion;
A disk that is disposed between the diaphragm and the spring and restricts displacement of the diaphragm in a direction away from the valve portion;
A receiving portion of the diaphragm that protrudes inward to a position on the valve portion side corresponding to a pressure contact outer peripheral portion of the disk that is pressed against the diaphragm by the spring is integrally formed, and is connected to the body of the valve portion. A second housing adapted to be
The pressure control valve is characterized in that the receiving portion of the second housing is provided with notches radially on the contact surface with the diaphragm . In a pressure control valve having a diaphragm-type pressure-sensitive member and a valve portion,
  A first housing that defines a sealed space partitioned by a flexible diaphragm;
  A spring disposed in the first housing and biasing the diaphragm toward the valve portion;
  A disk that is disposed between the diaphragm and the spring and restricts displacement of the diaphragm in a direction away from the valve portion;
  A receiving portion of the diaphragm projecting inwardly to a position on the valve portion side corresponding to a pressure contact outer peripheral portion of the disk pressed against the diaphragm by the spring is integrally formed and connected to the body of the valve portion. A second housing adapted to be
  The receiving portion of the second housing is provided with a communication hole formed so as to penetrate the receiving portion outside a position corresponding to the press contact outer peripheral portion of the disk. Pressure control valve to play.

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