Rotary pump with ventilated chamber

Details Rotary pump with ventilated chamber Rotary pump with ventilated chamber

1999-02-04

2001-01-02

Lopez, F. Daniel (Department: 3745)

Rotary kinetic fluid motors or pumps

Including means for handling portion separated from working...

C415S056200, C415S088000

Utility Patent

active

06168376

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to a centrifugal pump with a pump chamber that accommodates a radial impeller, an aspiration port that is arranged coaxially to the radial impeller and at least one ventilating conduit leading from the pump chamber's inner radial area to the outside.
In DE 43 25 549 C3 a centrifugal pump of this type is described which specifically serves the purpose of pumping out the coolant or cooling lubricant emulsion accumulated in the engine bed of a machine tool. The liquid will then be reintroduced to the tool by means of another pump, if required.
Cooling lubricants used with this type of machine tools have become less and less harmful to the environment over recent years. However, newly developed cooling lubricants have a relatively poor gas evolution. Consequently, the liquid pumped out of the engine bed has an increased air share. The radial impeller's centrifugal effect facilitates a separation of air and liquid in the pump chamber generating an air cushion in the pump chamber's inner radial area which prevents the intake of additional liquid. Specifically during the start phase of pump operation this may cause problems of delivery.
In order to avoid these problems, the aforementioned pump incorporates ventilating conduits leading back from the pump chamber's inner radial area along the aspiration port's wall to the liquid pit in the engine bed. In addition, an axial impeller is provided inside the aspiration port improving the intake of liquid into the pump chamber. If an air cushion is generated in the pump chamber, the pressure in said cushion is higher than the ambient pressure. This facilitates evacuation of the air via ventilating conduits without a need for an extract fan. An improved pump performance specifically during the start phase can be achieved with this system.
The invention's purpose is to further improve the pump performance and the behavior during the start phase of an aforementioned pump type.
SUMMARY OF THE INVENTION
The problem is solved according to the invention by fitting interference contours to the pump chamber's external circumferential edge in order to swirl the liquid flow, which runs essentially in a tangential direction.
Experiments have shown that this measure can further reduce the generation of an air cushion in the pump chamber and, consequently, improve the pump performance and the behavior during the start phase. This is probably caused by the fact that the liquid's swirling reduces the liquid flow's tangential velocity component. This, in turn, reduces the centrifugal effect causing the separation of air and liquid without impeding the liquid flowing off into the pump's riser. Moreover, this measure produces a higher pressure in the pump chamber and, thus, an improved evacuation of the air via the ventilating conduits.
The interfering contours are preferably formed by individual pocket-shaped deepenings in the pump chamber's circumferential wall and the area of the pump chamber's bottom wall located radially outside the impeller, respectively.


REFERENCES:
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patent: 1048479 (1959-01-01), None
patent: 4325549 (1995-08-01), None
patent: 0460597 (1991-12-01), None
patent: 0936356A1 (1999-08-01), None

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