Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part
Reexamination Certificate
1999-09-27
2001-07-31
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
C415S199400, C417S423120, C417S423150
Reexamination Certificate
active
06267554
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a cooling water pump with an internal rotor which is held in the housing and carries at least two impellers and with flow guide housings, namely an inflow housing and an outflow housing.
A number of boundary conditions must be observed in the design of cooling water pumps for internal combustion engines, particularly for motor vehicles. Such a cooling water pump must be simple in its design, cheap to produce and sufficiently sturdy in order to match the engine's service life without requiring any maintenance whatsoever. A further important criterion in the design of cooling water pumps is the restricted available installation space in modern motor vehicles. There is an additional problem in certain engines that high conveying quantities must be provided already at relatively low speeds. Moreover, the efficiency is to be as high as possible in order to reduce fuel consumption.
Usually, cooling water pumps are designed as radial centrifugal pumps whose dimensions are designed according to the volumes to be conveyed. Serious constructional problems can occur particularly when the outer diameter of the pump is limited.
DESCRIPTION OF THE PRIOR ART
A cooling water pump for an internal combustion engine is known from DE 725 762 C which is provided with a three-stage arrangement. Radial inflow and radial outflow of the cooling water is provided. A pump of such design requires a relatively large installation space and in many cases can therefore not be used. The same applies to a pump as is disclosed in U.S. Pat. No. 1,370,823 A for example.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a cooling water pump for an internal combustion engine which shows a high conveying quantity and conveying level already at relatively low speeds. In particular, the outside diameter of the pump is to be as small as possible.
This object is achieved in accordance with the invention that a bearing element is provided in which the rotor is held and which is used to fasten the cooling water pump and that a flow guide housing is integrally arranged with the bearing element. The cross-flow of the cooling water occurs substantially in the axial direction, even though the impellers are provided with a radially outwardly directed flow component. As a result of the preferably provided guide blades, the cooling water flow is directed radially inwardly so as to provide an optimal flow against the next following impeller. A particularly favorable constructional arrangement of the cooling water pump is given in the case that the pump is provided with a three-stage arrangement and two intermediate housings are provided between the inflow housing and the outflow housing. It is particularly preferable in this case if guide blades are provided which are fixedly connected with the intermediate housings.
In a particularly favorable embodiment of the present invention it is provided that the rotor is provided with a shaft stub held in an overhung arrangement to which the impellers are fastened. In this case the design is particularly simple and sturdy.
The cooling water pump in accordance with the invention can preferably be directly flanged onto the engine block or the cylinder head of the internal combustion engine when the bearing element is provided with a flanging surface which is parallel to the axis of the cooling water pump and the outflow opening is arranged in the flange surface. This leads to a particularly compact and secure design, because the number of sealing surfaces and connecting parts is minimized. The production costs can be reduced further by arranging the impellers as identical parts.
REFERENCES:
patent: 1370823 (1921-03-01), Krause
patent: 4067665 (1978-01-01), Schwartzman
patent: 4120618 (1978-10-01), Klaus
patent: 4479756 (1984-10-01), Sieghartner
patent: 5409350 (1995-04-01), Mitchell
patent: 5951264 (1999-09-01), Hori et al.
patent: 128755 (1996-03-01), None
patent: 725762 (1942-08-01), None
patent: 93483 (1983-11-01), None
Gossett PLLC Dykema
Look Edward K.
McAleenan James M
TCG Unitech Aktiengesellschaft
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