Pumps – Condition responsive control of drive transmission or pump... – Adjustable cam or linkage
Patent
1994-08-31
1997-04-15
Berisch, Richard A.
Pumps
Condition responsive control of drive transmission or pump...
Adjustable cam or linkage
417270, F04B 126
Patent
active
056203101
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to a flow control valve adapted for being incorporated in a variable displacement refrigerant compressor. More particularly, it relates to a control valve for controlling a pressure level in a crank chamber of a variable displacement refrigerant compressor provided with a suction chamber for refrigerant gas before compression, a discharge chamber for the refrigerant gas after compression, and a crank chamber for receiving therein a compression mechanism driven by a drive shaft, in order to adjustably change an amount of compressed refrigerant gas delivered from the compressor toward a car climate control system.
PRIOR ART
U.S. Pat. No. 4,428,718 discloses a variable displacement refrigerant compressor including an open ended cylinder block having a plurality of cylinder bores arranged around an axis of the compressor, a front housing connected to the front end of the cylinder block so as to define a crank chamber therein extending in front of the front end of the cylinder block, a rear housing connected to the rear end of the cylinder block so as to define therein a suction chamber for receiving refrigerant gas before compression and a discharge chamber for receiving the refrigerant gas after compression. The crank chamber receives therein an axial drive shaft having one end rotatably supported by the cylinder block and the other end also rotatably supported by the front housing. The drive shaft has a swash plate supported thereon so as to be capable of rotating together with the drive shaft and of changing an angle of inclination with respect to a plane perpendicular to the axis of the drive shaft. The swash plate has a non-rotatable wobble plate mounted thereon via a thrust bearing. The wobble plate capable of changing an angle of inclination thereof together with the swash plate is connected to plurality of pistons via connecting rods so that respective pistons are able to reciprocate in corresponding respective cylinder bores.
A valve plate, suction valves, and discharge valves are arranged between the rear end of the cylinder block and the rear housing. Namely, the respective cylinder bores of the cylinder block are alternately communicated with the suction and discharge chambers of the rear housing via the suction and discharge valves during the reciprocation of the pistons.
The rear housing receives therein a control valve provided with pressure-sensitive bellows capable of displacing in response to detection of a gas pressure under suction at the inlet port of the compressor, and a valve mechanism operating in response to the displacement of the bellows so as to change an opening degree of a fluid communication passageway between the crank chamber and the discharge chamber and an opening degree of a fluid communication passageway between the crank chamber and the suction chamber.
In the above-mentioned compressor of U.S. Pat. No. 4,428,718, when the gas pressure under suction detected at the inlet port of the compressor increases above a predetermined level in relation to a rise of an ambient temperature, the bellows of the control valve is compressed so as to move the valve mechanism so that the opening degree of the communication passageway between the crank chamber and the suction chamber is increased while closing the communication passageway between the crank chamber and the discharge chamber. Thus, the pressure level in the crank chamber is reduced due to extraction of a pressurized gas from the crank chamber toward the suction chamber. Accordingly, back pressure acting on the respective pistons is lowered so as to increase the angle of inclination of the swash and wabble plates. Consequently, the reciprocating stroke of the respective pistons is increased so as to increase the displacement of the compressor.
On the contrary, when the gas pressure under suction detected at the inlet port of the compressor is reduced to the predetermined level in relation to a fall of the ambient temperature, the communication passageway between the c
REFERENCES:
patent: 4428718 (1984-01-01), Skinner
patent: 4480964 (1984-11-01), Skinner
patent: 4747753 (1988-05-01), Taguchi
patent: 4780059 (1988-10-01), Taguchi
patent: 5332365 (1994-07-01), Taguchi
Takeichi Toru
Takenaka Kenji
Berisch Richard A.
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Kim Ted
LandOfFree
Control valve for a variable displacement refrigerant compressor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Control valve for a variable displacement refrigerant compressor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Control valve for a variable displacement refrigerant compressor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-356248