Variable capacity wobble plate compressor

Claim 1

A variable capacity wobble plate compressor comprising: a crankcase; a wobble plate accomodated within said crankcase; a suction chamber; a discharge pressure chamber; a communication passage communicating between said crankcase and said suction chamber; and a pressure-control valve disposed across said communication passage for adjusting pressure in said crankcase to change the inclination angle of said wobble plate whereby the delivery quantity or capacity is varied, said pressure-control valve comprising deformable means variable in length with a change in the suction pressure; a valve body attached to one end of said deformable means for selectively opening and closing said communication passage depending on the length of said deformable means; a first movable member attached to the other end of said deformable means; a first spring interposed between said valve body and said first movable member and urging said valve body in a closing direction; a second movable member having a pressure-receiving portion for receiving at least discharge pressure from said discharge pressure chamber, said second movable member being selectively brought into and out of urging contact with said first movable member in response to at least a change in the discharge pressure acting upon said pressure-receiving portion; and a spring seat disposed in opposite and spaced relation to said pressure-receiving portion of said second movable member; and a second spring interposed between said spring seat and said second movable member, wherein when the discharge pressure is higher than a predetermined value, said second movable member is biased away from said first movable member by the discharge pressure against at least the force of said second spring, and when the discharge pressure is lower than the predetermined value, said second movable member is urged against said first movable member by at least the force of said second spring against the discharge pressure to urge said valve body in the closing direction via said first movable member, said first spring, and said deformable means.