| (11) | EP 4 053 406 A1 |
(12) | EUROPEAN PATENT APPLICATION |
published in accordance with Art. 153(4) EPC |
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(54) | CAPACITY CONTROL VALVE |
(57) There is provided a capacity control valve capable of improving responsiveness. A capacity control valve V includes: a valve housing 10 provided with a suction port 11 through which a suction fluid of a suction pressure Ps passes and a control port 12 through which a control fluid of a control pressure Pc passes; a valve body 51 to be driven by a solenoid 80; a spring 85 that biases the valve body 51 in a direction opposite to a direction of driving by the solenoid 80; a CS valve 50 that includes a CS valve seat 10a and the valve body 51, and that moves the valve body 51 to open and close a communication between the control port 12 and the suction port 11, the capacity control valve V opening and closing the CS valve 50 to control the control pressure Pc, in which the control fluid of the control pressure Pc is suppliable to a back side of the valve body 51, and the capacity control valve V further includes flow passage control device 40 that uses a fluid pressure generated by opening and closing of the CS valve 50 and a pressure on the back side of the valve body 51 to decrease the pressure on the back side of the valve body 51. |
{TECHNICAL FIELD}
{BACKGROUND ART}
{CITATION LIST}
{Patent Literature}
{SUMMARY OF INVENTION}
{Technical Problem}
{Solution to Problem}
{BRIEF DESCRIPTION OF DRAWINGS}
FIG. 1 is a schematic configuration view showing a swash plate-type variable displacement compressor into which a capacity control valve according to a first embodiment of the present invention is assembled.
FIG. 2 is a cross-sectional view showing a state where a CS valve is opened when the capacity control valve according to the first embodiment is in a non-energized state.
FIG. 3 is an enlarged view of main parts showing a state where the CS valve is opened when the capacity control valve according to the first embodiment is in the non-energized state, and showing a pressure distribution in a state where a first pressure-actuated valve is closed and a second pressure-actuated valve is opened when a control pressure is low. Incidentally, in order to show the pressure distribution, the hatching of a cross section of each member is omitted.
FIG. 4 is an enlarged view of main parts showing a state where the CS valve is closed when the capacity control valve according to the first embodiment is in an energized state, and showing a pressure distribution in a state where the first pressure-actuated valve is opened and the second pressure-actuated valve is closed when the control pressure is high. Incidentally, in order to show the pressure distribution, the hatching of a cross section of each member is omitted.
FIG. 5 is an enlarged view of main parts showing a pressure distribution in a state where when the capacity control valve according to the first embodiment switches from the energized state in FIG. 4 to the non-energized state to open the CS valve, the first pressure-actuated valve is opened and the second pressure-actuated valve is closed. Incidentally, in order to show the pressure distribution, the hatching of a cross section of each member is omitted.
FIG. 6 is a cross-sectional view showing a state where a CS valve is opened when a capacity control valve according to a second embodiment of the present invention is in a non-energized state.
FIG. 7 is an enlarged view of main parts showing a state where the CS valve is opened when the capacity control valve according to the second embodiment is in the non-energized state, and showing a pressure distribution in a state where a first pressure-actuated valve and a second pressure-actuated valve are closed when a control pressure is low. Incidentally, in order to show the pressure distribution, the hatching of a cross section of each member is omitted.
FIG. 8 is an enlarged view of main parts showing a state where the CS valve is closed when the capacity control valve according to the second embodiment is in an energized state, and showing a pressure distribution in a state where the first pressure-actuated valve is opened and the second pressure-actuated valve is closed when the control pressure is high. Incidentally, in order to show the pressure distribution, the hatching of a cross section of each member is omitted.
FIG. 9 is an enlarged view of main parts showing a pressure distribution in a state where when the capacity control valve according to the second embodiment switches from the energized state in FIG. 8 to the non-energized state to open the CS valve, the first pressure-actuated valve is closed and the second pressure-actuated valve is opened. Incidentally, in order to show the pressure distribution, the hatching of a cross section of each member is omitted.
{DESCRIPTION OF EMBODIMENTS}
{First embodiment}
{Second embodiment}
{REFERENCE SIGNS LIST}
a valve housing provided with a suction port through which a suction fluid of a suction pressure passes and a control port through which a control fluid of a control pressure passes;
a valve body to be driven by a solenoid;
a spring that biases the valve body in a direction opposite to a direction of driving by the solenoid; and
a CS valve that includes a CS valve seat and the valve body, and that moves the valve body to open and close a communication between the control port and the suction port, the capacity control valve opening and closing the CS valve to control the control pressure,
wherein the control fluid of the control pressure is suppliable to a back side of the valve body, and
the capacity control valve further comprises a flow passage control device that uses a fluid pressure generated by opening and closing of the CS valve and a pressure on the back side of the valve body to decrease the pressure on the back side of the valve body.
wherein the flow passage control device includes an actuating valve body and a biasing device, and
the flow passage control device is a valve in which a force due to the fluid pressure and a biasing force of the biasing device are opposed to a force due to the pressure on the back side of the valve body.
REFERENCES CITED IN THE DESCRIPTION
Patent documents cited in the description