Rotary expansible chamber devices – With mechanical sealing – Seal element between working member and cylinder
Patent
1999-07-21
2000-10-17
Benion, Thomas
Rotary expansible chamber devices
With mechanical sealing
Seal element between working member and cylinder
418258, 418259, 418269, F01C 1900
Patent
active
061321966
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an apparatus capable for use as a pump or motor, and in particular, to a fluid Vane pump/motor.
BACKGROUND OF THE INVENTION
Typically, fluid vane motors comprise a housing having a cylindrical bore closed by end plates and a rotor mounted for rotation within the bore. The rotor is in the form of a solid cylindrical billet of metal with longitudinally extending slots formed about its periphery. The axis of rotation of the rotor is parallel to but offset from the longitudinal axis of the housing. A plurality of vanes are supported in respective longitudinal slots in the rotor in a manner so as to allow movement in the radial direction. Fluid chambers are formed between adjacent vanes, the volume of the chambers varying as the rotor rotates. When functioning as a pump, the chambers act to displace fluid from an inlet in the housing to an outlet, and when acting as a motor, the chambers allow for the release of pressure of a pressurised fluid to cause rotation of a shaft attached to the rotor.
Conventional fluid vane motors/pumps are notoriously inefficient due to leakage of fluid between adjacent chambers via leakage paths formed about the periphery of the vanes as well as through the rotor itself. Additionally, high frictional losses occur due to the substantial contact area between the peripheral edges of the vanes and end plates of the housing.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an apparatus capable for use as a pump or motor of increased efficiency.
According to the present invention there is provided an apparatus capable for use as a pump or motor, said apparatus comprising: said housing further including first and second ports both allowing fluid communication between the interior and exterior of said housing; for rotation within said cavity about a rotation axis extending parallel to and offset from a longitudinal axis of said cavity, said rotor body having opposite first and second ends which include respective portions of reduced diameter with respect to an intermediate portion of said rotor body; opposite first and second ends and terminating in and inboard of said reduced diameter portions; and, separate slots for movement radially of said rotation axis; chamber is formed between adjacent vanes, an inner circumferential surface of said housing and said rotor, and wherein said first and second ports are disposed in different ones of said chambers.
Preferably said opposite ends of each slot are arcuate in shape.
Preferably there is provided a seal about each of said reduced diameter portions, said seals being seated so as to cover the opposite ends of each slot and sealing abut axially opposite ends of said vanes.
Preferably each end of said housing is provided with a stepped inner surface formed by the junction of two faces and each seal can make sealing contact with both of said faces of an adjacent end of said housing.
Preferably a groove extending radially from each end of each slot is formed on a surface at each of said first and second ends interior of said rotor body for receiving axially opposite ends of a vane received in that slot.
Preferably said grooves on said interior surface at said first end of said rotor body extend beyond the centre of said rotor body.
In an alternate embodiment said interior surface at said first end of said rotor body is provided with a circular recess centered about said rotation axis and the grooves formed on this interior surface extends radially from the end of the slots near said first end to said circular recess.
Preferably said rotor comprises a shaft extending from the first end of said rotor body and through an aperture formed in a first of said ends of said housing, wherein when said apparatus is used as a pump, torque can be applied to said shaft to impart rotational motion to said rotor, and when said apparatus is used as a motor, said shaft can act as a power take off.
Preferably the second end of said rotor body opposite said shaft is provided wit
REFERENCES:
patent: 3995976 (1976-12-01), Ishizuka
patent: 4268230 (1981-05-01), Bassan
patent: 4331420 (1982-05-01), Jones
patent: 4445830 (1984-05-01), Woodruff
patent: 4484873 (1984-11-01), Inagaki et al.
patent: 5964584 (1999-10-01), Lorentz
Benion Thomas
Brown Kevin C.
Trieu Theresa
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