×

Air conditioner and control valve in variable displacement compressor

  • US 6,457,319 B1
  • Filed: 11/21/2000
  • Issued: 10/01/2002
  • Est. Priority Date: 11/25/1999
  • Status: Expired due to Fees
First Claim
Patent Images

1. An air conditioner including a refrigerant circuit, the refrigerant circuit having a condenser, a decompression device, an evaporator and a variable displacement compressor, wherein the compressor has a discharge pressure zone, the pressure of which is a discharge pressure, and a suction pressure zone, the pressure of which is a suction pressure, wherein the refrigerant circuit further has a high pressure passage extending from the discharge pressure zone to the condenser and a low pressure passage extending from the evaporator to the suction pressure zone, the air conditioner comprising:

  • a displacement control mechanism, which controls the displacement of the compressor based on the pressure difference between the pressure at a first pressure monitoring point located in the refrigerant circuit and the pressure at a second pressure monitoring point located in the refrigerant circuit, wherein the first pressure monitoring point is located in a section of the refrigerant circuit that includes the discharge pressure zone, the condenser and the high pressure passage, and wherein the second pressure monitoring point is located in a section of the refrigerant circuit that includes the evaporator, the suction pressure zone and the low pressure passage;

    detectors for detecting external information used for controlling the compressor displacement other than the pressure difference; and

    a controller, which determines a target value of the pressure difference based on the detected external information, wherein the controller commands the target value to the displacement control mechanism, and wherein the displacement control mechanism controls the compressor displacement such that the actual pressure difference seeks the target value.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×