CN-115667718-B - Capacity control valve

CN115667718BCN 115667718 BCN115667718 BCN 115667718BCN-115667718-B

Abstract

The invention provides a capacity control valve having a fluid discharge function at the time of starting and having high operation efficiency. A capacity control valve (V1) is provided with a valve housing (10), a main valve (50) which is composed of a valve body (51) and a main valve seat (10 a), wherein the valve body (51) is driven by a solenoid (80), the main valve seat (10 a) is provided between a discharge port (12) and a control port (14) and can be contacted by the valve body (51), and a pressure sensitive valve member (52) which forms a pressure sensitive valve (53) together with a pressure sensitive body (60) arranged in a pressure sensitive chamber (40), and the control port (14) and a suction port (13) can be communicated through an intermediate communication passage (55) by opening and closing the pressure sensitive valve (53), wherein a slide valve body (90) which relatively slides with respect to the pressure sensitive valve member (52) to open and close a through hole (52 d) communicated with the intermediate communication passage (55) is provided, the slide valve body (90) divides the pressure sensitive chamber (40) into a Pd side space (S1) and a Pc side space (S2), and Pd-flow passages (90 b) which are formed on the slide valve body (90) to communicate the two spaces (S1, S2).

Inventors

Kurihara Taichi
FUKUDOME KOHEI
SHIRAFUJI KEIGO

Assignees

伊格尔工业股份有限公司

Dates

Publication Date: 20260508
Application Date: 20210524
Priority Date: 20200525

Claims (7)

1. A capacity control valve is provided with: a valve housing formed with a discharge port through which a discharge fluid having a discharge pressure passes, a suction port through which a suction fluid having a suction pressure passes, and a control port through which a control fluid having a control pressure passes; A main valve composed of a valve element driven by a solenoid and a main valve seat provided between the discharge port and the control port and capable of being contacted by the valve element; A pressure-sensitive body disposed in the pressure-sensitive chamber, and A pressure-sensitive valve member extending from the valve spool to the pressure-sensitive chamber, constituting a pressure-sensitive valve together with the pressure-sensitive body, An intermediate communication passage is formed in the valve body and the pressure-sensitive valve member, and the control port and the suction port can be communicated through the intermediate communication passage by opening and closing the pressure-sensitive valve, Wherein a through hole communicating with the intermediate communication passage is formed in the pressure-sensitive valve member, and a slide valve body is provided, which slides relatively with respect to the pressure-sensitive valve member in the pressure-sensitive chamber to open and close the through hole, The slide valve body divides the pressure-sensitive chamber into a Pd-side space on the discharge port side and a Pc-side space on the control port side, and a Pd-Pc flow path that communicates the two spaces is formed in the slide valve body.
2. The capacity control valve according to claim 1, wherein, The slide valve core slides along an outer peripheral surface of the pressure-sensitive valve member.
3. The capacity control valve according to claim 1 or 2, wherein, The Pd-Pc flow path is formed by a communication hole penetrating the slide valve body in the axial direction.
4. The capacity control valve according to claim 1 or 2, wherein, The Pd-Pc flow paths are arranged at equal intervals along the circumferential direction.
5. The capacity control valve according to claim 1 or 2, wherein, A protrusion is provided between the slide valve body and a flange portion formed on the pressure-sensitive valve member, the flange portion being positioned on the tip end side of the pressure-sensitive valve member with respect to the through hole.
6. The capacity control valve according to claim 5, wherein, The slide valve body is provided with a protrusion protruding toward the flange portion.
7. The capacity control valve according to claim 1 or 2, wherein, A stopper for restricting movement of the slide valve element in the opening direction is provided on the valve housing.

Description

Capacity control valve Technical Field The present invention relates to a capacity control valve for variably controlling the capacity of a working fluid, and for example, to a capacity control valve for controlling the discharge amount of a variable capacity compressor used in an air conditioning system of an automobile in accordance with pressure. Background A variable displacement compressor for use in an air conditioning system of an automobile or the like is provided with a rotary shaft rotatably driven by an engine, a swash plate whose inclination angle is variable and connected to the rotary shaft, a compression piston connected to the swash plate, and the like, and the amount of fluid discharge is controlled by changing the stroke of the piston by changing the inclination angle of the swash plate. By using a capacity control valve which is opened and closed by electromagnetic force, the inclination angle of the swash plate can be continuously changed by appropriately controlling the pressure in the control chamber by using the suction pressure Ps of the suction chamber for sucking the fluid, the discharge pressure Pd of the discharge chamber for discharging the fluid pressurized by the piston, and the control pressure Pc of the control chamber in which the swash plate is housed. In the continuous driving of the variable capacity compressor, the capacity control valve is normally controlled by a control computer to perform energization control, and by moving a valve body in the axial direction by electromagnetic force generated by a solenoid, a main valve provided between a discharge port through which a discharge fluid having a discharge pressure Pd passes and a control port through which a control fluid having a control pressure Pc passes is opened and closed to adjust the control pressure Pc of a control chamber of the variable capacity compressor. In normal control of the capacity control valve, the pressure of the control chamber in the variable capacity compressor is appropriately controlled, and the amount of discharge of fluid to the discharge chamber is controlled by continuously changing the inclination angle of the swash plate to the rotation shaft, thereby changing the stroke amount of the piston, and the air conditioning system is adjusted to the target cooling capacity. In addition, when the variable displacement compressor is driven at the maximum displacement, the main valve of the displacement control valve is closed to reduce the pressure of the control chamber, thereby maximizing the inclination angle of the swash plate. In addition, there is also known a capacity control valve in which an auxiliary communication passage is formed to communicate between a control port and a suction port of the capacity control valve, and refrigerant in a control chamber of the variable capacity compressor is discharged to a suction chamber of the variable capacity compressor through the control port, the auxiliary communication passage, and the suction port at the time of starting, so that the pressure in the control chamber is rapidly reduced at the time of starting, and the responsiveness of the variable capacity compressor is improved (see patent document 1). Prior art literature Patent literature Patent document 1 Japanese patent No. 5167121 (page 7, FIG. 2) Disclosure of Invention Problems to be solved by the invention However, in patent document 1, the fluid discharge function is excellent at the time of starting, but at the time of continuous driving of the variable capacity compressor, the auxiliary communication path is communicated, and the refrigerant flows from the control port into the suction port, so that the refrigerant circulation amount is large, and the operation efficiency of the variable capacity compressor may be lowered. The present invention has been made in view of such a problem, and an object thereof is to provide a capacity control valve having a fluid discharge function at the time of starting and having high operation efficiency. Means for solving the problems In order to solve the above problems, a capacity control valve according to the present invention includes: a valve housing formed with a discharge port through which a discharge fluid having a discharge pressure passes, a suction port through which a suction fluid having a suction pressure passes, and a control port through which a control fluid having a control pressure passes; A main valve composed of a valve element driven by a solenoid and a main valve seat provided between the discharge port and the control port and capable of being contacted by the valve element; A pressure-sensitive body disposed in the pressure-sensitive chamber, and A pressure-sensitive valve member extending from the valve spool to the pressure-sensitive chamber, constituting a pressure-sensitive valve together with the pressure-sensitive body, An intermediate communication passage is formed in the valve body and the pressure-sensitive