Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1998-01-28
2000-08-01
Thorpe, Timothy S.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417440, 4174105, F04B 4900
Patent
active
060957646
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
This invention generally relates to a scroll compressor with a scroll compression mechanism made up of a fixed scroll and a moving scroll and more specifically to technology to prevent damage to the scroll compression mechanism due to opposite rotation of the moving scroll to the correct rotation direction.
2. Background Art
A typical scroll compressor of this type has in a casing a scroll compression mechanism comprising two different scrolls, namely a moving scroll rotatably driven by a motor and a fixed scroll secured to the casing. The moving scroll has a panel board from which an involute body projects. On the other hand, the fixed scroll has a panel board disposed so as to face the panel board of the moving scroll. Disposed on the panel board of the fixed scroll is an involute body which engages with the involute body of the moving scroll in order that a compression chamber may be defined therebetween. Approximately centrally formed in the panel board of the fixed scroll is a discharge port through which gas compressed in a compression chamber between the two involute bodies is discharged towards the back of the fixed scroll. A portion of the casing on the side of the back of the fixed scroll acts as a high-pressure discharge chamber, in other words, the casing is divided into two portions, namely the high-pressure discharge chamber and a low-pressure suction chamber. If such division of the casing internal cavity is made by the fixed scroll per se, the fixed scroll is likely to undergo bending due to differential in pressure between the discharge chamber and the suction chamber. As a result, the compressor falls off in performance. With a view to providing a solution to such a problem, Japanese Patent Application Laying Open Gazette No. 2-125986 has offered a proposal in which a barrier wall (partition) for providing a division into a discharge chamber and a suction chamber is disposed on the fixed scroll rear side.
Japanese Patent Application Laying Open Gazette No. 4-241702 shows a scroll compressor. A discharge opening is formed in the barrier wall for introducing gas, discharged from the discharge port of the fixed scroll, to the discharge chamber. A check valve is disposed at an opening portion of the discharge opening on the side of the discharge chamber, in order to prevent reverse flow of the gas from the discharge chamber into the suction chamber. In accordance with this prior art scroll compressor, a seal member is provided between the fixed scroll and the barrier wall in order to provide a hermetical seal between an inner compartment including the discharge port and the discharge opening and an outer compartment on the peripheral side of a space defined between the fixed scroll and the barrier wall.
In such a scroll compressor, when the moving scroll is normally operated, that is, when the moving scroll is operated in the correct rotation direction, gas flows in the scroll compression mechanism. Frictional heat, caused by contact of the forward end surfaces of the involute bodies of the fixed and moving scrolls with their respectively facing panel boards, is released to outside the scroll compression mechanism because of such a gas flow, therefore producing no problems.
If the moving scroll is opposition operated or operated in a rotation direction opposite to the correct rotation direction for some reason such as inaccurate power wiring of the drive motor, then the check valve is closed. The discharge port pressure falls below that of the suction and discharge chambers, and a vacuum is finally created. Because of this, gas stagnates and ceases to flow and frictional heat becomes close in the scroll compression mechanism. Both of the involute bodies undergo thermal expansion due to the fictional heat, as a result of which the forward end surfaces of the involute bodies are abnormally pressed against their respectively facing panel boards. Much greater frictional heat is produced, therefore causing seizing in the forward end surfaces of the i
REFERENCES:
patent: 5452989 (1995-09-01), Rood et al.
Kajiwara Mikio
Shibamoto Yoshitaka
Ueda Shuusaku
Yoshimura Keiji
Daikin Industries Ltd.
Studebaker Donald R.
Thorpe Timothy S.
Tyler Cheryl J.
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