US 6,662,581 B2 · Variable displacement compressor and displacement control valve for variable displacement compressor

Abstract

A displacement control valve that performs transition between operating capacities in a reduced time period. A valve element for introducing refrigerant from a discharge chamber into a pressure-regulating chamber after reducing discharge pressure Pd of the refrigerant to pressure Pc1, and a valve element for introducing refrigerant having pressure Pc2 from the pressure-regulating chamber into a suction chamber under suction pressure Ps are configured to open and close in an interlocked fashion, and a displacement control valve is comprised of the valve elements and a solenoid section that applies to a solenoid force corresponding to a predetermined differential pressure to these valve elements. When control to the minimum operating displacement is carried out, the valve element is fully opened, and the valve element is fully closed, while control to the maximum operating displacement is carried out, the valve element is fully closed, and the valve element is fully opened, whereby transmission between operating capacities is performed in a reduced time period.

Claims19

Dependent claims

A variable displacement compressor including a wobble member arranged in a pressure-regulating chamber formed airtightly, such that an inclination angle of the wobble member can be changed with respect to a rotational shaft, and driven by rotation of the rotational shaft for wobbling motion, and pistons each connected to the wobble member for performing reciprocating motion in a direction parallel to the rotational shaft in accordance with the wobbling motion of the wobble member, to thereby draw refrigerant from a suction chamber into a cylinder, compress the refrigerant, and deliver the compressed refrigerant from the cylinder to a discharge chamber,

characterized in that a flow rate of the refrigerant flowing in a first refrigerant passage extending from the discharge chamber to the pressure-regulating chamber and a flow rate of the refrigerant flowing in a second refrigerant passage extending from the pressure-regulating chamber to the suction chamber are controlled in an interlocked fashion such that the first refrigerant passage and the second refrigerant passage are opened and closed, based on a change in a differential pressure between pressure in the suction chamber and pressure in the discharge chamber.

A displacement control valve for a variable displacement compressor, for controlling an amount of refrigerant introduced from a discharge chamber into a pressure-regulating chamber, such that a differential pressure between pressure in the suction chamber and pressure in the discharge chamber are maintained at a predetermined differential pressure, to thereby change an amount of the refrigerant discharged from the variable displacement compressor, characterized by comprising:

first and second valve elements operated in an interlocked fashion for opening and closing a refrigerant passage extending between the discharge chamber and the pressure-regulating chamber and a refrigerant passage extending between the pressure-regulating chamber and the suction chamber, respectively;
and
a solenoid section for applying a solenoid force corresponding to the predetermined differential pressure to the first and second valve elements.

Dependencies are inferred from the claim text.

Variable displacement compressor and displacement control valve for variable displacement compressor

Life of this patent

Variable displacement compressor and displacement control valve for variable displacement compressor

Life of this patent

Abstract

Claims19