Capacity control valve

Abstract

In an embodiment, a capacity control valve includes: a pressure-sensitive body 50 positioned in a third valve chamber 38 ; an adapter 53 provided on the free end of the pressure-sensitive body 50 having a circular seating surface; a third valve part 43 that moves integrally with a valve element 40 in the third valve chamber 38 and has a circular engagement surface that opens/closes intake-side passages 34 by engaging with and separating from the seating surface of the adapter 53 ; and a solenoid 60 that applies an electromagnetic drive force to the valve element 40 in the direction of closing a first valve part 41 , wherein the pressure-sensitive body 50 is formed by a formed bellows made of material having greater yield stress than phosphor bronze, and the formed bellows has its diameter set smaller and its stroke longer than the diameter and stroke of a phosphor bronze bellows.

1 . A capacity control valve, comprising:
 discharge-side passages communicating a discharge chamber that discharges fluid and a control chamber that controls a discharge rate of fluid;   a first valve chamber formed along the discharge-side passages;   intake-side passages communicating an intake chamber that takes in fluid and the control chamber;   a second valve chamber formed along the intake-side passages;   a valve element that integrally has a first valve part that opens/closes the discharge-side passages in the first valve chamber and a second valve part that opens/closes the intake-side passages in the second valve chamber, where the two valve parts open/close in opposite directions due to reciprocating motion;   a third valve chamber formed along the intake-side passages at a position closer to the control chamber than to the second valve chamber;   a pressure-sensitive body positioned in the third valve chamber to apply, by extending, a bias force in a direction of opening the first valve part, and also to contract as a surrounding pressure increases;   an adapter provided on a free end of the pressure-sensitive body in extending/contracting directions and having a circular seating surface;   a third valve part that moves integrally with the valve element in the third valve chamber and has a circular engagement surface that opens/closes the intake-side passages by engaging with and separating from the seating surface of the adapter; and   a solenoid that applies an electromagnetic drive force to the valve element in a direction of closing the first valve part;   the capacity control valve characterized in that:   the pressure-sensitive body is formed by a formed bellows made of material having greater yield stress than phosphor bronze; and   the formed bellows has its diameter set smaller and its stroke longer than a diameter and stroke of a phosphor bronze bellows.   
     
     
         2 . A capacity control valve according to  claim 1 , characterized in that the pressure-sensitive body is formed with austenitic stainless material. 
     
     
         3 . A capacity control valve according to  claim 1 , characterized in that the adapter provided on the free end of the formed bellows and a partition adjustment member provided on a fixed end are formed with non-magnetic material. 
     
     
         4 . A capacity control valve according to  claim 3 , characterized in that the partition adjustment member is formed with austenitic stainless material. 
     
     
         5 . A capacity control valve according to  claim 3 , characterized in that the formed bellows, adapter, and partition adjustment member are fixed by means of electron beam welding, and an interior of the formed bellows is kept in an absolute vacuum state. 
     
     
         6 . A capacity control valve according to  claim 2 , characterized in that the adapter provided on the free end of the formed bellows and a partition adjustment member provided on a fixed end are formed with non-magnetic material. 
     
     
         7 . A capacity control valve according to  claim 6 , characterized in that the partition adjustment member is formed with austenitic stainless material. 
     
     
         8 . A capacity control valve according to  claim 4 , characterized in that the formed bellows, adapter, and partition adjustment member are fixed by means of electron beam welding, and an interior of the formed bellows is kept in an absolute vacuum state. 
     
     
         9 . A capacity control valve according to  claim 6 , characterized in that the formed bellows, adapter, and partition adjustment member are fixed by means of electron beam welding, and an interior of the formed bellows is kept in an absolute vacuum state. 
     
     
         10 . A capacity control valve according to  claim 7 , characterized in that the formed bellows, adapter, and partition adjustment member are fixed by means of electron beam welding, and an interior of the formed bellows is kept in an absolute vacuum state.