Rotary kinetic fluid motors or pumps – Working fluid passage or distributing means associated with... – Scroll or helical type casing with specific exit nozzle
Patent
1994-10-28
1996-09-03
Look, Edward K.
Rotary kinetic fluid motors or pumps
Working fluid passage or distributing means associated with...
Scroll or helical type casing with specific exit nozzle
4152151, F04D 2944
Patent
active
055518397
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A rotary pump is known from DE-A-33 16 927 that is comprised of a housing divided into two identical housing halves by a plane that is located perpendicular to the housing axis and running through the middle of the housing and is preferably made of plastic. The housing has a separately-formed outlet pipe that is connected to a lateral outlet opening provided on the external periphery of the housing. In one embodiment of the housing, the direction of its outlet opening is offset to the center axis of the housing. In addition, the interior chamber of the pump housing extends into the connection area of the outlet pipe. The outlet opening of the housing is provided with a flange, so that the outlet pipe can be mounted on the bearing surface of the housing with a corresponding rectangular connection flange. The rotary pump is adapted to various requirements through the use of outlet pipes of corresponding different shapes. The two-part embodiment of the housing with identical housing halves, which has an opening for securing to a pump or to receive a cover with an inlet opening, restricts the usable area. For ease of assembly, the impeller may not be larger than said opening. Consequently, the pump has an impeller diameter that is much smaller than the diameter of the housing, and adjustment of its power is restricted with regard to delivery heads and flow rates. The rotary pump shown in the illustration is a non-clogging pump used to convey high flow rates of contaminated water containing a great deal of grease. Therefore, the pump is not intended for the build-up of high pressures. Furthermore, this design has the disadvantage that many parts must be assembled. In addition to the housing parts, seals and connecting elements are required. The way in which the parts are connected requires flanges, and gaps in which deposits can form are produced between the parts.
DE-A-30-00 095 shows a centrifugal pump having a pump housing that has a discharge disposed substantially tangentially in relation to the wall enclosing the pump housing, whereby the discharge has an opening with a substantially rectangular cross section. That opening diminishes the stiffness of the housing and does not provide any additional protection against the deformation forces caused by the internal pressure. Welding to the pipe is difficult, since the welded seam runs in three planes. For that reason, the pipe is designed in such a way that it can be mounted on the three-dimensional contour of the housing.
SUMMARY OF THE INVENTION
The aim of the invention is to create a standard pump housing for impellers with various delivery heads and flow rates that can be manufactured with a simple sheet metal shaping technique, is very stiff even at the joint, and achieves the best possible efficiency.
The aim is achieved in accordance with the invention in that a flattened part is disposed on the housing circumference, the flattened part narrows the flow chamber arranged downstream of the impeller and delimited by the pump housing in the direction of the pump axis, and an opening for connecting with a pipe having a standard connection cross-section is arranged on the flattened part.
The advantages provided by the invention are comprised in particular of the fact that flattening the pump housing allows reliable connection of the pipe with the hosing by welding in one plane. In that regard, a connection with no gaps can be produced that allows sensitive pump media to be conveyed. The flattened part also increases the stiffness of the housing. The pump housing is primarily developed to be manufactured using a sheet metal shaping technique, but is also equally suitable to be manufactured using other technologies and other materials.
A further development has the advantage that enlarging the surface area of the flattened part makes it easier to connect the pipe with the housing because sufficient room is created for automated welding. It is essential that the surface on the connection cross section of the pipe remains constant
REFERENCES:
patent: 1109393 (1914-09-01), Blackstead
patent: 1997387 (1935-04-01), McCord
patent: 2999628 (1961-09-01), Crombie
patent: 4398867 (1983-08-01), Dernedde et al.
patent: 5069599 (1991-12-01), Carretta
patent: 5112190 (1992-05-01), Kajiwara et al.
patent: 5133642 (1992-07-01), Kajiwara
patent: 5184937 (1993-02-01), Arakawa et al.
Riel Axel
Schuster Oliver
Seitz Kurt
KSB Aktiengesellschaft
Look Edward K.
Sgantzos Mark
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