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Control valve for variable displacement compressor

  • US 7,381,031 B2
  • Filed: 01/25/2005
  • Issued: 06/03/2008
  • Est. Priority Date: 01/29/2004
  • Status: Active Grant
First Claim
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1. A control valve for a variable displacement compressor, which is mounted on the variable displacement compressor to control pressure within a hermetic crankcase thereof to thereby change discharging capacity of refrigerant, comprising:

  • a body having a refrigerant passage formed therethrough;

    a valve section including a valve element moving to and away from a valve seat formed in the body so as to adjust a flow rate of refrigerant when part of refrigerant discharged from the variable displacement compressor is caused to flow into the crankcase, and a shaft configured to be axially slidably supported by the body and support the valve element such that the valve element can be caused to operate in unison therewith; and

    a solenoid including a core fixed within the body, a plunger for moving the valve element forward and backward within the body via the shaft so as to cause the valve element to open and close, and a solenoid coil for generating a magnetic circuit including the plunger and the core by electric current supplied from outside,wherein the plunger is formed by arranging a first plunger opposed to the core, and a second plunger to which an end of the shaft, opposite to the valve element, is connected, in series in an axial direction, the plunger being formed by arranging a pressure-sensing member for sensing suction pressure from a suction chamber, and a hollow cylindrical magnetic member for fixing the pressure-sensing member to the solenoid, between the first and second plungers,wherein the first plunger is configured to be urged in a direction away from the core, and support the second plunger in an axial direction when the solenoid is energized, andwherein the second plunger includes a small-diameter portion inserted into the magnetic member such that a predetermined space is formed therebetween, and a large-diameter portion radially outwardly extending from the small-diameter portion and having an opposed surface formed thereon which is axially opposed to an opposed surface of the magnetic member, the second plunger being urged in a direction away from the first plunger, while the magnetic circuit being formed via the opposed surfaces during energization of the solenoid.

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