Rotary expansible chamber devices – With mechanical sealing
Patent
1989-10-12
1991-11-05
Bertsch, Richard A.
Rotary expansible chamber devices
With mechanical sealing
277 81R, 277 81S, F04C 2700
Patent
active
050627775
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a pump assembly in which the pump housing constitutes the pump foundation and in which the pump housing comprises a working space for product-feeding units, and a casing which belongs encloses parts of the bearing axles of the units projecting backwards from the pump housing, and movement-transmitting elements for the bearing axles, can be fitted in the foundation. Additionally, the pump is of the type in which the bearing axles are pre-arranged arranged in bearing sleeves which, with the casing not mounted, can be anchored from the rear in the pump housing, in rear recesses in the housing, so that the axles extend, through front recesses in the pump housing, into the working space in which they can be connected in a rotationally fixed manner with the units. Also included are sliding ring seals which are arranged at the front recesses in order to seal off the working space from the rear parts of the pump. A front gable/gable section on the pump housing is removably fitted in order to permit access to the sliding ring seals from the front end of the pump housing when the gable/gable section and the units are not mounted.
BACKGROUND OF THE INVENTION
Pumps for puming, for example, foodstuffs and the like are previously known. Such pumps can comprise sealing arrangements for sealing off the working or pump space from the other parts of the pump and in the sealing arrangements there can be used sliding ring seals of known types. In pumps of the type referred to above, to support the product-feeding units/rotors, bearing sleeves are used in which anchoring of the bearing axles can take place. In the pre-assembly of the bearing axles their bearings can be clamped for appropriate rotation and securing of the bearing axles. The bearing sleeves facilitate assembly of the different parts of the pump.
In pumps of this type it is important that the pump can be made with the lowest possible number of parts which are easy to produce and assemble without renouncing the high demands placed on the pump as such. Among other things, it is especially important that the sealing arrangement can be arranged simply and with high reliability. It must be possible to maintain the mutual adjustment of dimensions in spite of a simplified construction and assembly operation. It is also important from the point of view of cleaning and service that a simple removal of mounted sliding ring seals can be carried out, which means that each respective seat and sliding ring seal parts which are located in this or possibly behind this must be designed for easy access and removal of such sliding ring seal parts after removal of the front gable of the pump and the units/rotors.
SUMMARY OF THE INVENTION
The aim of the present invention is to propose pump assembly in which the above problems and others are solved.
The principal characterizing features of an arrangement according to the invention are among others that the pump housing at each of the front recesses is designed as a seat which is assigned to the rotationally fixed part of each sliding ring seal and which is arranged or interacting with an element fixing fixes the axial displacement for the rotationally
fixed part, and that the seat and the rotationally fixed part are arranged for simple introduction into and access for removal from the seat of the rotationally fixed part. The rotationally fixed part is arranged in a rotationally fixed manner by means of eccentric design in the rotationally fixed part and the seat. In one embodiment, the rotationally fixed part of the sliding ring seal is arranged with an exposed interacting surface for an extraction element which can be passed over the respective axle from the front end of the pump when the pump is demounted and the respective product-feeding unit is removed. In a second alternative embodiment, each sliding ring seal is provided with an inner rotatable part arranged on a seal holder which is accessible with the extraction device which is in this connection fixed in a corresponding
REFERENCES:
patent: 2509912 (1950-05-01), Eliasson
patent: 3433489 (1969-03-01), Wiese
patent: 4145059 (1979-03-01), Imai et al.
patent: 4936821 (1990-06-01), Zuccato
Buchter, H. Industrial Sealing Technology (John Wiley & Sons, New York) 1979, pp. 208-219.
Bertsch Richard A.
Cavanaugh David L.
Johnson Pump AB
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