Scroll-type variable-capacity compressor having two control valves
AssigneesNippondenso Co., Ltd., Nippon Soken, Inc.
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.
Claims5
A scroll-type variable-capacity compressor comprised of the following:
- (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 form a plurality of operating spaces between said spiral vanes;
- (c) a suction pressure chamber introducing a low pressure fluid to an outer circumference of said plurality of operating spaces;
- (d) a discharge pressure chamber in which high pressure fluid is discharged from a center of said plurality of said operating spaces passing through a discharge valve;
- (e) a first cylinder which is formed along said end plate of said stationary scroll member from part of an outer circumference side of said end plate to a center side thereof;
- (f) a group of bypass holes comprised of a plurality of bypass holes which open in said end plate of said stationary scroll member and thereby communicate a space in said first cylinder and said operating spaces;
- (g) a communicating path which communicates said space in said first cylinder with said suction pressure chamber;
- (h) a first plunger which is inserted in said first cylinder in a reciprocating moving manner and successively opens or closes said group of bypass holes to change a capacity of said compressor between a maximum capacity and a predetermined capacity;
- (i) a second cylinder which communicates with said discharge pressure chamber at all times;
- (j) a discharge port which opens to said second cylinder and discharges fluid to the outside;
- (k) a suction bypass port which opens to said second cylinder and can cause fluid to bypass from said second cylinder to said suction pressure chamber side;
- (l) a second plunger which is inserted in a reciprocating moving manner in said second cylinder, which opens and closes said discharge port and said suction bypass port, and which closes one of said ports when the other is opened and vice versa, to change the capacity of said compressor between said predetermined capacity and 0 percent;
- (m) a control means for controlling the reciprocating movement positions of said first plunger and said second plunger;
- whereby
- (n) when the discharge capacity is changed between 100 percent capacity and said predetermined capacity, said first plunger opens and closes said group of bypass holes and said second plunger opens said discharge port in said second cylinder and closes said suction bypass port, while when said discharge capacity is changed between said predetermined capacity and 0 percent, said second plunger closes said discharge port and opens said suction bypass port in said second cylinder.
Dependencies are inferred from the claim text.