Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump
Patent
1998-02-26
2000-07-04
Look, Edward K.
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Turbine regenerative pump
415 555, 415200, 4152141, F04D 500
Patent
active
060829605
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In side-channel pumps, it is necessary to maintain a tight play between the vane and the surrounding casing parts. If the gap becomes too large, the leakage flows within the pump increase and pumping capacity and effectiveness decline. Since the vanes must also be prevented, as far as possible, from running up against the casing parts, this means that those casing parts of the pump which enclose the vane, and the vane itself, must be accurately centred one to another and must be set perpendicular to the shaft. Finally, care should be taken in side-channel pumps to ensure that both the vane and the casing exhibit high strength characteristics, since side-channel pumps, in contrast to normal-intake pumps, can achieve many times higher pressures given equal pump dimensions and rotation speeds. This is particularly true of sectional pumps having a plurality of stages, in which very high pressures are obtained with just a relatively low number of stages. All these aspects have hitherto resulted in the casing parts which enclose the vane generally being constructed as metallic castings in which the interacting faces are worked with tight production tolerances. Although a pump of similar type, namely a peripheral pump, has been disclosed (GB-A 968 511), in which all pump casing parts are formed from sheet metal, this is only conceivable where the requirements in terms of trueness of running and efficiency are very low.
SUMMARY OF THE INVENTION
The object of the invention is to reduce the production complexity in side-channel centrifugal pumps of the type stated in the introduction, whilst maintaining a high level of efficiency. The solution according to the invention consists in the suction and pressure connectors of at least one stage pack being formed as sheet-metal parts and being disposed in an annular casing shell element.
The fact that the casing parts enclosing the vane are deep-drawn and punched as simple sheet-metal parts or are spatially formed in a similar fashion and the casing shell elements which reach over them are configured as simple annular parts means that the structural complexity is very low. The invention is based on the recognition that the dimensional accuracy which is now available for sheet-metal parts by deformation technology is sufficient, under certain preconditions, for such sheet-metal parts to be used as casing parts for side-channel pumps. The precondition for this is, however, that the sheet-metal parts should be of such simple design that a flat plate can be used as the original blank, which is then deep-drawn in the desired manner.
Although it is known (EP-A 588 258), in a normal-intake centrifugal pump, to provide a disc-shaped annular element of a stepped casing pack made from formed sheet-metal, there are no fundamental accuracy requirements placed upon this part, whereas those inner casing parts which interact with the impeller are traditionally configured as castings.
Furthermore, in a normal-intake centrifugal pump (DE-A 36 29 123) on which no fundamental efficiency requirements are placed and in which the distributor of the individual pump stages is not therefore particularly matched in shape to the impeller, it is known to make this distributor from sheet-metal; yet, because of the different accuracy requirements, this cannot be a model for side-channel centrifugal pumps.
The casing shell elements of successive stages can be centred at the ends in a known fashion one to another and in relation to the end casing parts. They can also centre the suction and pressure connectors at their outer periphery. According to the invention, however, an embodiment is preferred in which the suction and pressure connectors in the casing shell elements exhibit radial play and are centred from the shaft. The radial play between the suction and pressure connectors and the casing shell elements is expediently only present during assembly, whereas, once assembly is completed and they have been centred by the shaft, the suction and pressure connectors are firm
REFERENCES:
patent: 2282569 (1942-05-01), Fabig
patent: 3440968 (1969-04-01), Jensen
patent: 4390317 (1983-06-01), Lehmann et al.
patent: 4842480 (1989-06-01), Jensen et al.
patent: 4877372 (1989-10-01), Jensen et al.
patent: 5318403 (1994-06-01), Kajiwara et al.
Fandrey Peter
Schulz Gudrun
Look Edward K.
Sterling Fluid Systems GmbH
Woo Richard
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