Pumps – Three or more cylinders arranged in parallel – radial – or... – Radial cylinders
Patent
1997-09-08
1999-06-15
Freay, Charles G.
Pumps
Three or more cylinders arranged in parallel, radial, or...
Radial cylinders
92 58, F04B 104
Patent
active
059115610
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a pump for conveying a medium, in particular a gas-liquid mixture, and particularly to the structure of the eccentric controlled pumping elements.
From the state of the art many different types of pumps are known. Radial piston pumps, for example, have a cylinder block that lies off-center inside a housing. In the cylinder block, pistons are arranged radially which, during the turning of the cylinder block, execute a stroke movement. Normally the pistons are supported in the housing by rollers.
Such radial piston pumps have the disadvantage that their construction, in particular the guiding of the pistons in the cylinder block is relatively complicated. In addition, such pumps pose problems when conveying gas-liquid mixtures which occur, in particular, when conveying crude oil. To avoid these problems the natural gas present in the crude oil is first separated by compensators and after the pump it is fed in again via compressors. However, this process is very complicated and expensive.
SUMMARY OF THE INVENTION
The object of the present invention is, therefore, to provide a pump which has a simple construction and can be used to convey gas-liquid mixtures.
This object is achieved by providing a pump having an enclosed housing with an annular, inwardly facing surface inside and extending around the housing, a generally tubular eccentric extending inside and axially through the annular surface and disposed eccentric to the axis of the annular surface; a displacer adapted for radial displacement disposed between the annular surface and the eccentric and rotatable around the axis of the annular surface. There is a supply of a liquid gas mixture to be pumped and an outlet from the pump. The displacer selectively draws the mixture from the supply into the displacer and/or pump the mixture from the displacer as the radial space between the eccentric and the annular surface correspondingly changes in size. The annular surface may be connected with a shaft, particularly a hollow shaft, which rotates the annular surface and the shaft may, in turn, be rotated by a motor rotor or even may be part of the motor. The supply of liquid is through the eccentric. The eccentric has respective inlet and outlet chambers which respectively communicate with the displacer at different locations around the annular surface for receiving liquid mixture from the supply or for pumping it and out of the pump. Sealing arrangements for the displacers and various numbers of displacers are also disclosed. With the solution according to the invention so-called displacers are used, which each have a changeable volume displacer chamber. The displacers are arranged between an annular surface located radially inward and an eccentric arranged eccentrically to and radially outward of the annular surface. The annular surface, in addition to supporting the displacers, serves to hold the displacers in a fixed position on i.e. non-rotatable with respect to the annular surface, so that they can turn relative to the eccentric. During the turning, because of the eccentricity, the radial distance between the annular surface and eccentric, and accordingly also the volume of the displacer chambers, changes continuously.
With this arrangement it is possible to dispense completely with a cylinder block as the displacers are individual, independent parts which can be installed in a simple manner between the eccentric and annular surface. Furthermore, this design permits a compact and extremely space-saving construction.
According to an advantageous further development of the invention the annular surface is driven by a hollow shaft which, in addition, acts as medium supply. As a result thereof the supplied medium is also made to turn. The centrifugal force acting on the medium causes the specific lighter gas to collect in a middle section and the specific heavier liquid medium in an outer ring-shaped area. With the aid of this separation an optimal charging of the displacer chambers takes place an
REFERENCES:
patent: 3345916 (1967-10-01), Tobias
patent: 4975025 (1990-12-01), Yamamura et al.
patent: 5547348 (1996-08-01), Riley et al.
patent: 5752427 (1998-05-01), Leutner
patent: 5848565 (1998-12-01), Thoma
patent: 5848879 (1998-12-01), Hanson
Freay Charles G.
Gartenberg Ehud
Linear Anstalt
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