Scroll-type variable-capacity compressor with bypass valve
AssigneeNippondenso Co., Ltd.
InventorsMitsuo Inagaki, Mikio Matsuda, Kazuhide Uchida, Hideaki Sasaya
Life of this patent
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Abstract
A scroll compressor wherein a cylinder is provided along the end plate of a stationary scroll member and a plurality of bypass holes which open in the end plate and can communicate with the space in the cylinder and a plurality of operating spaces formed between the spiral vanes of the stationary scroll member and a moving scroll member are successively opened by a plunger to communicate with the suction side, whereby the capacity may be changed smoothly. When reducing the capacity to close to 0 percent, another cylinder and plunger are used to bypass the discharge pressure to the suction side.
Claims7
A scroll-type variable-capacity compressor comprising:
- (a) a stationary scroll member having a spiral vane formed on a stationary end plate;
- (b) a moving scroll member which has a spiral vane formed on an end plate supported so as to enable a revolution in a state with a rotation inhibited and able to oppositely engage with said spiral vane of said stationary scroll member and which forms a plurality of operating spaces between these spiral vanes;
- (c) a suction pressure chamber introducing a low pressure fluid to the outer circumference of said plurality of said operating spaces;
- (d) a discharge pressure chamber in which high pressure fluid is discharged from the center of said plurality of said operating spaces;
- (e) a cylinder which is formed along said end plate of said stationary scroll member in a direction from part of the outer circumference side of said end plate to the center side of the same avoiding a discharge opening at a center of said scroll member;
- (f) a group of bypass holes comprised of a plurality of bypass holes which are disposed so as to substantially align linearly along said cylinder avoiding the discharge opening and open in said end plate of said stationary scroll member and can directly communicate the space in said cylinder and said operating spaces;
- (g) a communicating path which communicates said space in said cylinder with said suction pressure chamber;
- and
- (h) a plunger which is inserted in said cylinder in a reciprocally moving manner and successively opens or closes directly said group of bypass holes.
Dependencies are inferred from the claim text.