US 6,234,763 B1Granted

Variable displacement compressor

AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho

InventorsMasaki Ota, Kenta Nishimura, Hirotaka Kurakake, Taku Adaniya

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Abstract

A variable displacement compressor the displacement of which is externally controlled is provided. The compressor has basically the same structure as prior art compressors except for simple differences. A pressure sensing chamber of a displacement control valve is connected to a suction chamber by an outlet passage. A bellows is located in the pressure sensing chamber. The bellows expands and contracts in accordance with the pressure in the sensing chamber. A valve chamber forms part of a displacement control passage, which is used to control the pressure of a crank chamber. A valve body is located in the valve chamber. The valve body is moved by the bellows to open and close the displacement control passage. Highly pressurized gas from the discharge chamber is supplied to the pressure sensing chamber through an inlet passage. The gas in the pressure sensing chamber is released to the suction chamber through the outlet passage. An electromagnetic valve is located in the outlet passage to regulate the flow of refrigerant gas from the sensing chamber. The outlet passage also includes a bypass passage. The bypass passage bypasses the electromagnetic valve and constantly communicates the pressure sensing chamber with the suction chamber.

Claims19

Dependent claims

A variable displacement compressor that has a suction zone, a discharge zone, a crank chamber, a displacement control valve, and a displacement control passage, the displacement control passage being controlled by the displacement control valve to vary the pressure in the crank chamber, wherein the compressor compresses gas drawn from the suction zone and discharges the compressed gas to the discharge zone, wherein the displacement of the compressor varies according to the pressure of the crank chamber, the displacement control valve comprising:

a valve chamber for forming part of the displacement control passage;
a valve body located in the valve chamber to regulate an opening in the displacement control passage;
a pressure sensing chamber connected to the discharge zone and an associated zone whose internal pressure is held at a pressure associated with a suction pressure of the suction zone wherein gas flows into the pressure sensing chamber from the discharge zone through an inlet passage and flows out of the pressure sensing chamber to the associated zone through an outlet passage;
a pressure sensing mechanism located in the pressure sensing chamber, wherein the pressure sensing mechanism acts on the valve body to adjust the position of the valve body according to the pressure in the pressure sensing chamber;
and
an electromagnetic valve for regulating one of the inlet passage and the outlet passage to change the pressure of the pressure sensing chamber according to a determination based on external conditions.

3 more elements

Dependencies are inferred from the claim text.