Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Casing with axial – conical flow runner
Patent
1987-02-24
1988-10-04
Schwartz, Larry I.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Casing with axial, conical flow runner
415219R, F01D 2516
Patent
active
047752955
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a centrifugal pump casing.
Centrifugal pump casings of the type to which the invention pertains are externally loaded by forces due to piping and are also subjected to high internal pressures.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the invention to provide a centrifugal pump casing of sheet material which remains stable under the influence of high internal pressures.
The object is accomplished in that the casing comprises a one-piece or multiple-section sheet-metal jacket and a flange which is located at the suction side of the case and is integral with the jacket. The jacket has a plurality of corrugations in the region of the bores for the flange screw joint.
Integration of the suction side connecting flange in the casing jacket according to the invention results in a spherical or arcuate configuration of the pressure-absorbing casing between the pressure side fastening flange and the connection to the suction line. This yields a casing which is well-protected against deformation. The corrugation-like spaces, which are required for the mounting of the flange connecting screws, produce additional reinforcement of the casing jacket.
In one embodiment of the invention, the corrugation-like spaces are provided with disc-like abutments in the region of the suction side connecting flange. This embodiment is used in those cases where the nuts of the flange screw joints are disposed in these corrugation-like spaces. The abutments then allow the flange of the suction line and that of the suction nozzle integrated in the casing jacket to be connected with one another.
Another embodiment of the invention provides for a separate annular flange to be connected with the casing jacket in the region of the suction side connecting flange. The casing jacket here has a shoulder next to the corrugation-like spaces for the flange screw joint, and an annular flange lies flush against the shoulder and is fixed to the casing jacket. This annular flange, which can likewise be in the form of a discrete sheet material part, effects further reinforcement of the casing jacket.
In accordance with a further embodiment of the invention, the casing jacket is provided with an insert which constitutes the suction nozzle and forms a split seal with the impeller. This insert, which may, for example, be introduced into the casing jacket from the pressure side, can be manufactured as a simple tubular part. Depending upon its design, it can cooperate directly with the suction mount of the impeller to thus form a split seal or it receives an appropriately configurated split ring which cooperates with the suction mouth of the impeller.
According to yet another embodiment of the invention, the casing jacket is provided with a one-piece or multiple section insert which constitutes the suction nozzle and/or the suction side lateral impeller chamber. This can improve the hydraulic characteristics inside the casing jacket and also makes it possible to obtain additional reinforcement of the casing jacket.
A further embodiment of the invention, in which reinforcing means are arranged inside the casing between the suction nozzle and the space surrounding the suction nozzle, functions in this manner. The reinforcing means can be appropriately configurated shaped sheet material parts which, for example, extend between the region of the split ring and the corrugation-like spaces. The space which is inside the casing jacket and surrounds the suction nozzle can equally well be filled with appropriate sealing materials. These can be metallic. However, it is also possible to use appropriate synthetic resins.
BRIEF DESCRIPTION OF THE DRAWING
FIGS. 1 thru 3 show a casing jacket having corrugation-like spaces provided with abutments, and
FIGS. 4 thru 6 show a casing jacket provided with an annular flange.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The casing jacket 1 is provided, on the pressure side, with a fastening flange 2 which connects the casing jacket with a non-illustrated floo
REFERENCES:
patent: 1707719 (1929-04-01), Goldthwaite
patent: 2805615 (1957-09-01), Rudy
patent: 2844100 (1958-07-01), Heinecke
patent: 2916997 (1959-12-01), Terrie
patent: 3523743 (1970-08-01), Jolette
patent: 3746465 (1973-07-01), Van Dorn et al.
patent: 4288202 (1981-09-01), Buckmann
Ghiotto Renzo
Lovisetto Primo
Scherer Rolf
Starke Jorg
Klein, Schanzlin & Becker Aktiengesellschaft
Kontler Peter K.
Lowara S.p.A.
Schwartz Larry I.
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