CAPACITY CONTROL VALVE

• US 20200132060A1
• Filed: 02/08/2018
• Published: 04/30/2020
• Est. Priority Date: 02/18/2017
• Status: Active Grant

• Current Assignee: Eagle Industry Company Limited
• Original Assignee: Eagle Industry Company Limited
• Inventors: HIGASHIDOZONO, Hideki, HAYAMA, Masahiro
• Granted Patent: US 11,542,930 B2
• Time in Patent Office: Days
• CPC Class Codes: F04B 2027/1813 Crankcase pressure
• CPC Class Codes: F04B 2027/1827 between crankcase and discharge chamber
• CPC Class Codes: F04B 2027/1831 between crankcase and suction chamber
• CPC Class Codes: F04B 2027/185 Discharge pressure
• CPC Class Codes: F04B 2027/1854 External parameters
• CPC Class Codes: F04B 2027/1859 Suction pressure
• CPC Class Codes: F04B 27/1804 Controlled by crankcase pressure
• CPC Class Codes: F16K 31/06 using a magnet , e.g. diaphragm valves, cutting off by means of a liquid

Abstract

In an exemplary embodiment, a capacity control valve includes: a valve main body 2 having a first valve chamber 7 through which a fluid at control pressure passes and which has a first valve seat surface 31A, and an interior space 4 through which a fluid at suction pressure passes; and a valve body 21 having an intermediate communication passage 26 for communicating the first valve chamber 7 and the interior space 4, and a first valve part 21C for opening and closing the intermediate communication passage 26 adjacent to the first valve seat surface 31A, wherein an opening area of the first valve part 21C is smaller than that of the intermediate communication passage 26. The capacity control valve is capable of simultaneously achieving reduction of a start-up time of the variable capacity compressor and improvement of responsiveness of capacity control at the time of control.

Claims

1. A capacity control valve for controlling a flow rate or pressure in a control chamber according to a valve opening degree of a valve section, characterized by comprising:

a valve main body having a first valve chamber communicating with a first communication passage through which a fluid at control pressure passes and having a first valve seat surface and a second valve seat surface, a second valve chamber having a valve hole communicating with the first valve chamber and communicating with a second communication passage through which a fluid at discharge pressure passes, and an interior space communicating with a third communication passage through which a fluid at suction pressure passes;

a pressure sensitive body arranged in the interior space and having a communication part communicating with the interior space on a free end part side moving so as to extend and contract in response to the suction pressure;

a valve body including at least an intermediate communication passage for communicating the first valve chamber and the interior space, a second valve part for opening and closing the valve hole for communicating the first valve chamber and the second valve chamber by separating from and contacting with the second valve seat surface, a first valve part for opening and closing the intermediate communication passage by separating from and contacting with the first valve seat surface in conjunction with the second valve part in the opposite direction thereto, and an abutment part abutting the free end part of the pressure sensitive part; and

a solenoid section attached to the valve main body and actuating the respective valve parts of the valve body so as to be opened and closed, and characterized in that;

an opening area of the first valve part is smaller than that of the intermediate communication passage.

2. The capacity control valve according to claim 1, characterized in that the second valve part is disengaged from the second valve seat surface, and at the same time, resistance of a flow passage leading to the interior space from the first valve chamber is increased according to a stroke of the valve body, and resistance of a flow passage leading to the first valve chamber from the second valve chamber is decreased according to the stroke of the valve body.

3. The capacity control valve according to claim 1, characterized in that the opening area of the first valve part when the second valve part is closed is set to exceed a blow-by gas amount.

4. The capacity control valve according to claim 1, characterized in that the first valve part has a first valve part surface opposed to the first valve seat surface, and an axial gap part whose size is changed according to the stroke of the valve body is included between the first valve part surface and the first valve seat surface.

5. The capacity control valve according to claim 1, characterized in that the first valve part has a first valve part surface opposed to the first valve seat surface and formed in a radial direction and a tapered surface whose diameter is reduced toward an axial direction from an inner diameter part of the first valve part surface, and an axial gap part whose size is changed according to the stroke of the valve body is included between the first valve part surface and the first valve seat surface and a radial gap part whose size is changed according to the stroke of the valve body is included between the tapered surface and the first valve seat surface.

6. The capacity control valve according to claim 2, characterized in that the opening area of the first valve part when the second valve part is closed is set to exceed a blow-by gas amount.

7. The capacity control valve according to claim 2, characterized in that the first valve part has a first valve part surface opposed to the first valve seat surface, and an axial gap part whose size is changed according to the stroke of the valve body is included between the first valve part surface and the first valve seat surface.

8. The capacity control valve according to claim 2, characterized in that the first valve part has a first valve part surface opposed to the first valve seat surface and formed in a radial direction and a tapered surface whose diameter is reduced toward an axial direction from an inner diameter part of the first valve part surface, and an axial gap part whose size is changed according to the stroke of the valve body is included between the first valve part surface and the first valve seat surface and a radial gap part whose size is changed according to the stroke of the valve body is included between the tapered surface and the first valve seat surface.

9. The capacity control valve according to claim 3, characterized in that the first valve part has a first valve part surface opposed to the first valve seat surface, and an axial gap part whose size is changed according to the stroke of the valve body is included between the first valve part surface and the first valve seat surface.

10. The capacity control valve according to claim 3, characterized in that the first valve part has a first valve part surface opposed to the first valve seat surface and formed in a radial direction and a tapered surface whose diameter is reduced toward an axial direction from an inner diameter part of the first valve part surface, and an axial gap part whose size is changed according to the stroke of the valve body is included between the first valve part surface and the first valve seat surface and a radial gap part whose size is changed according to the stroke of the valve body is included between the tapered surface and the first valve seat surface.

11. The capacity control valve according to claim 6, characterized in that the first valve part has a first valve part surface opposed to the first valve seat surface, and an axial gap part whose size is changed according to the stroke of the valve body is included between the first valve part surface and the first valve seat surface.

12. The capacity control valve according to claim 6, characterized in that the first valve part has a first valve part surface opposed to the first valve seat surface and formed in a radial direction and a tapered surface whose diameter is reduced toward an axial direction from an inner diameter part of the first valve part surface, and an axial gap part whose size is changed according to the stroke of the valve body is included between the first valve part surface and the first valve seat surface and a radial gap part whose size is changed according to the stroke of the valve body is included between the tapered surface and the first valve seat surface.