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US 5,330,463 AGranted
Scroll type fluid machinery with reduced pressure biasing the stationary scroll
AssigneeMitsubishi Jukogyo Kabushiki Kaisha
InventorTakahisa Hirano
Life of this patent
Estimating the term…
Abstract
A scroll type fluid machinery has a stationary scroll and revolving scroll with spiral elements set up at end plates thereof. The scrolls respectively, are engaged with each other, and a high pressure fluid chamber is formed on the outside of the end plate of the stationary scroll. A low pressure fluid chamber or an intermediate pressure fluid chamber is formed between the end plate of the stationary scroll and the high pressure fluid chamber. As a result, the pressure of a low pressure fluid or an intermediate pressure fluid acts on the outside of the end plate of the stationary scroll. Accordingly, deformation of the end plate is prevented or reduced, and reliability of the fluid machinery may be improved.
Claims19
A scroll type fluid machinery comprising:
- a closed housing, the housing having means forming a high pressure chamber and means forming a low pressure chamber, fluid pressure in the closed housing varying form a low pressure in the low pressure chamber to a high pressure in the high pressure chamber;
- a stationary scroll and a revolving scroll having end plates, each end plate having a spiral element and the spiral elements being engageable with each other so as to form closed spaces which varying in volume during revolution of the revolving scroll in a solar motion;
- a first annular member surrounding a discharge port in the stationary scroll;
- the high pressure fluid chamber being partially formed on an outside of the end plate of said stationary scroll by a partition wall, the end plate and the first annular member and the high pressure fluid chamber being in communication with the discharge port defined in the stationary scroll, the partition wall separating at least a portion of the high pressure chamber form the low pressure chamber in the closed housing;
- a second annular member at a periphery of the end plate of the stationary scroll, both the first and second annular members being integral with the end plate of the stationary scroll and both the first and second annular members having ends in sealing engagement with the partition wall forming the high pressure fluid chamber, the stationary scroll being fixed to the partition wall by at least one of the first and second annular members;
- an intermediate pressure fluid chamber being formed between the end plate of said stationary scroll, the first annular member, the second annular member and the partition wall forming said high pressure fluid chamber;
- and
- an intermediate pressure introduction hole communicating with said closed spaces and the intermediate pressure fluid chamber during compression, the intermediate pressure introduction hole being formed in the end plate of said stationary scroll, and intermediate pressure fluid in said closed spaces being introduced into said intermediate pressure fluid chamber through said hole.
5 more elements
A scroll type fluid machinery comprising:
- a closed housing, the housing having means forming a high pressure chamber and means forming a low pressure chamber, fluid pressure in the closed housing varying form a low pressure chamber in the low pressure chamber to a high pressure in the high pressure chamber;
- a stationary scroll and a revolving scroll having end plates, each end plate having a spiral element and the spiral elements being engageable with each other so as to form closed spaces which vary in volume during revolution of the revolving scroll in a solar motion;
- a first annular member surrounding a discharge port in the stationary scroll;
- the high pressure fluid chamber being formed on an outside of the end plate of said stationary scroll by a partition wall, the end plate and the first annular member and the high pressure fluid chamber being in communication with the discharge port defined in the stationary scroll, the partition wall separating at least a portion of the high pressure chamber from the low pressure chamber in the closed housing;
- a second annular member at a periphery of the end plate of the stationary scroll, both the first and second annular members being integral with the end plate of the stationary scroll and both the first and second annular members having ends in sealing engagement with the partition wall forming the high pressure fluid chamber, the stationary scroll being fixed to the partition wall by at least one of the first and second annular members;
- an intermediate pressure fluid chamber being formed between the end plate of said stationary scroll, the first annular member, the second annular member and the partition wall forming the high pressure fluid chamber;
- and
- means for reducing outward force on the end plate of the stationary scroll regardless of pressure within the closed spaces to thereby reduce deformation of the end plate of the stationary scroll, the means for reducing being located between the periphery of the end plate of the stationary scroll and the discharge port.
5 more elements
A scroll type fluid machinery comprising:
- a closed housing, the housing having means forming a high pressure chamber and means forming a low pressure chamber, fluid pressure in the closed housing varying from a low pressure chamber in the low pressure chamber to a high pressure in the high pressure chamber;
- a stationary scroll and a revolving scroll having end plates, each end plate having a spiral element and the spiral elements being engageable with each other so as to form closed spaces which vary in volume during revolution of the revolving scroll in a solar motion;
- a first annular member surrounding a discharge port in the stationary scroll;
- the high pressure fluid chamber being partially formed on an outside of the end plate of said stationary scroll by a partition wall, the end plate and the first annular member and the high pressure fluid chamber being in communication with the discharge port defined in the stationary scroll;
- a second annular member at a periphery of the end plate of the stationary scroll, both the first and second annular members being a part of the end plate of the stationary scroll and both the first and second annular members having ends in sealing engagement with the partition wall forming the high pressure fluid chamber;
- an intermediate pressure fluid chamber being formed between the end plate of said stationary scroll, the first annular member, the second annular member and the partition wall forming the high pressure fluid chamber;
- and
- means for reducing outward force on the end plate of the stationary scroll regardless of pressure within the closed spaces to thereby reduce deformation of the end plate of the stationary scroll, the means for reducing being located between the periphery of the end plate of the stationary scroll and the discharge port;
- wherein an intermediate pressure chamber has a volume V which will satisfy the following equation:
- ##EQU3## where, LP is suction pressure,
- MP is pressure in the intermediate pressure chamber,
- Vth is displacement, and
- .kappa. is an adiabatic exponent.
10 more elements
Dependencies are inferred from the claim text.