Rotary kinetic fluid motors or pumps – Including means for handling portion separated from working...
Patent
1995-02-24
1996-08-13
Look, Edward K.
Rotary kinetic fluid motors or pumps
Including means for handling portion separated from working...
415175, F01D 110
Patent
active
055450059
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a centrifugal pump. A type of a centrifugal pump is described, for instance, in EP Patent 114 932.
SUMMARY OF THE INVENTION
The object of the present invention is to improve the separation of gas and liquid in a pump of this type.
According to the invention the peripheral opening (12) is arranged in the hub housing wall (20) and is formed as a drive nozzle; the opening (12) debouches into a space (11) which adjoins the hub chamber (7) on the drive side and is connected with it by the slot (10); the opening (12) is directed against a diffuser pipe (13) in such a manner that it forms a liquid jet pump (12, 13), through which the liquid coming from the hub chamber (7) flows and entrains and discharges the gas coming from the slot (10).
The pressures occurring locally in the pump chamber differ in value depending on the configuration of the impeller and, accordingly, produce different liquid-gas compositions. The object of the invention is to improve the separation of liquid and gas as compared with said prior art, and to do so independently of the configuration of the impeller.
The vanes of the coaxial vane rotor which is connected fixed for rotation with the impeller or the vanes which are fastened with radial symmetry to the hub of the impeller receive the fluid which enters into the hub chamber and place it in intensive rotation. This has the result that the separation of gas and liquid is sharper, since the gas can leave the hub chamber at the smallest diameter (at the shaft clearance slot). The gas leaves the hub chamber before it mixes again with the liquid and can arrive back at the impeller channel due to the unequal pressure conditions in the labyrinth. The separated liquid, on the other hand, is imparted a higher pressure and is driven out through the nozzle of a liquid jet pump. The vacuum produced by the jet of liquid is utilized in order to remove the gases which have been separated. The gas-liquid mixture which emerges from the liquid jet pump can be conducted into a gas-liquid mixture chamber, for example, a gas separator of known construction, from where the liquid is returned into the pump suction line.
BRIEF DESCRIPTION OF THE DRAWING
The invention will be explained by way of example with reference to the accompanying diagrammatic drawing, in which:
FIG. 1 is a cross-section through a centrifugal pump; and
FIG. 2 is a view of the centrifugal pump in a reduced scale.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The centrifugal pump of FIG. 1 has an open, single-vane pump impeller 1 and is mounted for rotation in a pump housing 2. The impeller 1 is seated by means of its hub 3 on a shaft 4 which is mounted in a bearing 19 and turns with slight clearance "a" over the housing rear wall 5 which forms a labyrinth slot 6 with the hub 3 of the impeller 1. The labyrinth slot connects the pump chamber 2' with the hub chamber 7. Gas collected from the material conveyed in the center of the impeller and mixed with liquid passes through the labyrinth slot 6 out of the pump chamber 2' into the hub chamber 7, where it is imparted a stronger rotation by vanes 8 which are attached fixed for rotation to the hub 3. The stronger rotary movement of the gas-liquid mixture results in a better separation between gas and liquid, possible fiber substances being kept away by a guide spiral 9, for example, a spiral groove 9 or a spiral rib arranged in a hub housing wall 20 from a shaft clearance 10 through which the gases can pass into a chamber 11 separated from the hub chamber 7 by the hub housing wall 20. During this, the liquid flows under higher pressure out of the hub chamber 7 through a drive nozzle 12 which passes through the hub housing wall 20 into a diffuser pipe 13 and in this connection entrains the gas out of the chamber 11. A connecting line 14 which connects to the diffuser pipe 13 (FIG. 2) conducts the gas-liquid mixture into a lower pressure chamber such as a gas separator 15 which returns the liquid to the suction-si
REFERENCES:
patent: 4256436 (1981-03-01), Fandrey et al.
patent: 5114310 (1992-05-01), Haavik et al.
patent: 5152663 (1992-10-01), Peroaho et al.
patent: 5215430 (1993-06-01), Brown
patent: 5413462 (1995-05-01), Alberni
Farber Martin A.
Look Edward K.
Sgantzos Mark
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