Claims
- 1. A compressor having an internal refrigerant gas passage selectively connected to and disconnected with an external refrigerant circuit separately provided from the compressor, said compressor having a plurality of pistons reciprocable in a plurality of cylinder bores in a housing for compressing gas, said compressor comprising:
- a drive shaft rotatably supported by the housing;
- a swash plate supported on the drive shaft for integral rotation with inclining motion with respect to the drive shaft, said swash plate being movable between a maximum inclined angle and a minimum inclined angle;
- a rotary valve disposed in the middle of the internal refrigerant gas passage for synchronously rotating with the drive shaft, said rotary valve having a refrigerant supply passage for sequentially supplying the refrigerant gas in the internal refrigerant gas passage to each cylinder bore; and
- disconnecting means for disconnecting the external refrigerant circuit from the internal refrigerant gas passage when the swash plate is at the minimum inclined angle.
- 2. A compressor according to claim 1 further comprising control means for detecting a pressure sucked in the internal refrigerant gas passage to control the inclined angle of the swash plate.
- 3. A compressor according to claim 2, wherein said disconnecting means is disposed downstream of a position where said control means detects the pressure in the internal refrigerant gas passage.
- 4. A compressor according to claim 3, wherein said control means includes a valve which is opened in response to the pressure sucked from the external refrigerant circuit into the internal refrigerant gas passage.
- 5. A compressor according to claim 1 further comprising actuating means for driving the swash plate in accordance with an electric signal indicative of the operating conditions of the compressor.
- 6. A compressor having an internal refrigerant gas passage selectively connected to and disconnected with an external refrigerant circuit separately provided from the compressor, said compressor having a plurality of reciprocable pistons for compressing gas, said compressor comprising:
- a housing having a discharge chamber and a refrigerant suction;
- a crank chamber defined in the housing;
- a plurality of cylinder bores formed in the housing, each cylinder bore communicating to the discharge chamber and the refrigerant suction passage and accommodating each piston;
- a drive shaft rotatably supported by the housing;
- a swash plate supported on the drive shaft for integral rotation with inclining motion with respect to the drive shaft, said swash plate being movable between a maximum inclined angle and a minimum inclined angle;
- a rotary valve disposed in the middle of the internal refrigerant gas passage for synchronously rotating with the drive shaft, said rotary valve having a refrigerant supply passage for sequentially supplying the refrigerant gas in the internal refrigerant gas passage to each cylinder bore; and
- disconnecting means for disconnecting said external refrigerant circuit from the internal refrigerant gas passage when the swash plate is at the minimum inclined angle.
- 7. A compressor according to claim 6, wherein said internal refrigerant gas passage includes:
- a first passage for connecting the crank chamber and the refrigerant suction passage to deliver the refrigerant gas from the crank chamber to the refrigerant suction passage;
- a second passage for connecting the discharge chamber and the crank chamber to deliver the refrigerant gas from the discharge chamber to the crank chamber; and
- a circulating passage including the first and the second passages, said circulating passage being formed upon disconnection of the external refrigerant circuit from the internal refrigerant gas passage.
- 8. A compressor according to claim 7 further including:
- said external refrigerant circuit being connected to the refrigerant suction passage for supplying the refrigerant gas to the refrigerant suction passage; and
- an exhaust port for connecting the discharge chamber to the external refrigerant circuit to discharge the refrigerant gas from the discharge chamber to the external refrigerant circuit.
- 9. A compressor according to claim 7 further comprising actuating means for selectively opening and closing the second passage.
- 10. A compressor according to claim 9 further comprising a computer separately provided from the compressor, said computer being electrically connected to the compressor and computing conditions relative to the operation of the compressor.
- 11. A compressor according to claim 10, wherein said computer outputs electric signals indicative of the operational conditions of the compressor to the actuating means in order to drive the actuating means.
- 12. A compressor according to claim 9, wherein said actuating means includes an electromagnetic valve.
- 13. A compressor according to claim 6 further comprising control means for detecting a pressure sucked in the internal refrigerant gas passage to control the inclined angle of the swash plate.
- 14. A compressor according to claim 13, wherein said disconnecting means is disposed downstream of a position where said control means detects the pressure in the internal refrigerant gas passage.
- 15. A compressor according to claim 14, wherein said control means includes a valve which is opened in response to the pressure sucked from the external refrigerant circuit into the internal refrigerant gas passage.
- 16. A compressor according to claim 6, wherein said disconnecting means has a movable member movable along the internal refrigerant gas passage, said movable member and said rotary valve being movably supported on the drive shaft in an axial direction of the drive shaft, and wherein said movable member moves together with the rotary valve according to a change of the inclined angle of the swash plate and shuts off the cylinder bores from the refrigerant suction passage when the swash plate at the minimum angle.
- 17. A compressor according to claim 16, wherein said movable member shuts off the refrigerant supply passage from the refrigerant suction passage when the swash plate is at the minimum inclined angle.
- 18. A compressor according to claim 17, wherein said movable member includes:
- a pipe disposed between the swash plate and the rotary valve and being movable on the drive shaft in accordance with the change of the inclined angle of the swash plate, and wherein said pipe moves the rotary valve on the drive shaft based on the movement of the pipe; and
- a shutter member mounted on the drive shaft between the rotary valve and the refrigerant suction passage, and wherein said shutter member selectively opens and closes the refrigerant suction passage in accordance with the movement of the rotary valve.
- 19. A compressor according to claim 18, wherein said movable member includes a spring disposed between the rotary valve and the shutter member for urging the rotary valve toward the pipe.
- 20. A compressor according to claim 6, wherein said disconnecting means includes:
- a movable member movable along the internal refrigerant gas passage;
- a shutter plate formed integrally with the rotary valve, said shutter plate having a plurality of holes communicating the refrigerant suction passage and the refrigerant supply passage; and
- wherein said movable member closes the holes when the movable member moves on the drive shaft in accordance with the change of the inclined angle of the swash plate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-332137 |
Dec 1993 |
JPX |
|
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation in part application of the U.S. application Ser. No. 08/255,043 filed on Jun. 7, 1994, entitled SWASH PLATE TYPE COMPRESSOR.
US Referenced Citations (16)
Foreign Referenced Citations (1)
Number |
Date |
Country |
64-56972 |
Mar 1989 |
JPX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
255043 |
Jun 1994 |
|