Rotary kinetic fluid motors or pumps – With means for re-entry of working fluid to blade set – Turbine regenerative pump
Patent
1993-09-20
1996-06-18
Look, Edward K.
Rotary kinetic fluid motors or pumps
With means for re-entry of working fluid to blade set
Turbine regenerative pump
F04D 500
Patent
active
055271480
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a regenerative compressor and more specifically to a compressor having an impeller that can rotate within the housing of the compressor, having a support ring with blades wherein the support ring is connected to a hub element by a wall section and the hub element can be pushed onto a drive shaft.
EP-A-0 001 982 discloses a regenerative compressor of this type. In this regenerative compressor, a cover part is configured as a flat, annular disk. This disk has an assembly opening and is pushed onto an annular step provided on the hub element. At its rim, the disk is in contact in a corner recess configured on the supporting ring. The cover part is held by means of a front washer fastened by a screw connection at the end of the shaft of the impeller.
The front washer is supported on both the axially protruding annular step and on the cover part. The axial protrusion of the annular step must correspond precisely to the thickness of the cover part if the front washer is to come into contact with the cover part at all.
During a revolution of the impeller, different pressures act on the cover part at different locations on the periphery of the impeller so that the cover part may vibrate.
SUMMARY OF THE INVENTION
The present invention provides an arrangement for use in a generic type regenerative compressor That keeps the cover part is held firmly pressed onto the impeller.
In accordance with an embodiment of the present invention, the compressor having the impeller and supporting ring equipped with blades has a wall section that forms a boundary region for the impeller. The axial thickness of this wall section is less than the axial width of the impeller. An annular cover part has a rim in contact with a corner recess of the supporting ring and forms another boundary wall. That cover part includes an assembly opening that permits the element to be pushed onto the impeller. The sealing gaps present between the boundary walls of the impeller and the housing walls extend linearly over their full length. The cover part is held in contact on the supporting ring and the hub element by axial clamping.
Particularly in the corner recesses of the supporting ring, such an axial clamping of the cover part achieves firm pressure on the cover part and therefore prevents the undesirable vibration.
Two embodiments of the regenerative compressor permit clamping of the cover part to be achieved in a simple manner.
In one such embodiment the cover part is flat and is held in the region of its assembly opening by a clamping element against a contact surface of the hub element. The assembly opening may be a shaft opening such that the cover part can be pressed onto the shaft. The plane of the contact surface may be set back axially to the plane of the corner recess of the supporting ring.
In an alternative embodiment the cover part may have a conical shape and may be held by a clamping element against a contact surface on the hub element. The plane of the contact surface is located in the plane of the corner recess provided on the supporting ring.
In each of these embodiments the clamping element is a clamping ring that can be pressed against the cover part by a bolt arranged at the end of the shaft. The bolt which is necessary in any case for fastening the hub element onto the drive shaft can also undertake the application of pressure to the clamping ring. In consequence, no additional component is necessary for applying the clamping force.
BRIEF DESCRIPTION OF THE DRAWINGS
The subject matter of the application is described in more detail below by means of an embodiment example represented in the drawing. In this:
FIG. 1 shows, in section, a regenerative compressor connected to a drive motor.
FIG. 2 shows, in section, a cover part configured in conical shape.
DETAILED DESCRIPTION
A regenerative compressor connected to a drive motor 2 is indicated by 1; its housing consists of first and second housing halves 3 and 4. The regenerative compressor 1 also has an impell
REFERENCES:
patent: 4306833 (1981-12-01), Sixsmith et al.
patent: 4334821 (1982-06-01), Sixsmith et al.
Aust Norbert
Balling Manfred
Lee Michael S.
Look Edward K.
Siemens Aktiengesellschaft
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