Fluid pump having a pressure sealed motor chamber

Details Fluid pump having a pressure sealed motor chamber Fluid pump having a pressure sealed motor chamber

1994-02-23

1995-12-26

Bertsch, Richard A.

Pumps

Motor driven

Electric or magnetic motor

4174237, 41742311, F04B 3504

Patent

active

054782228

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a fluid pump comprising an electric drive motor having an impeller of a pump section mounted on its shaft, and comprising a housing.
The invention specifically relates to powerful pumps having an electrical power requirement in the range of 10 kW and more. So far, such pumps were usually installed with considerable expenditure in piping systems, with the expenditure being caused primarily by the fact that the drive of the pump unit proper was effected via a motor flange-mounted to the outside of the pump housing.
Such pump aggregates, with a power of 10 kW and more, are heavy and bulky and require specific support on a fixed foundation and thus cannot be integrated directly in the given piping path.
There are specific legal regulations concerning the design of pumps, in particular pumps used for pumping environmentally hazardous fluids. It must be ensured with certainty that leakage of environmentally hazardous pumping material is prevented. This leads to specific problems with respect to the sealing of the shaft passage. In the pumps used so far, the rotary shaft left the housing at at least one location of the pump housing. This is where special sealing measures must be taken.


SUMMARY OF THE INVENTION

It is the object of the invention to make available a fluid pump of the type indicated at the outset which, on the basis of its compact construction, may easily be installed in piping systems without any specific support problems and which, furthermore, reliably prevents the leakage of pumping material by avoiding shaft passages or lead-outs in the housing.
According to the invention, this object is met with a fluid pump of the type indicated in that the housing is hermetically sealed jointly for the drive motor and the rotary parts of the pump section and is formed without shaft lead-out to the outside, that a partition having a shaft passage bore and separating a drive section containing the drive motor from the pump section is formed within the housing, and in that a gas having a specific pressure is contained in a cavity of the drive section containing the drive motor.
Seen from the outside, the housing of the pump according to the invention is a completely hermetically sealed structure. There are no locations at which the shaft is led out to the outside. This results in particulary good hermetic sealing of the housing. The partition in the interior of the housing provides that the pump section is sufficiently separated from the drive section and that, thus, practically no pumping material can reach the cavity of the drive section. This is of particular importance when aggressive pumping material is involved that could possibly damage parts of the drive section. The separation is further enhanced by a seal on the rotary shaft, which is located between the pump section and the drive section. The gas in the cavity of the drive section is regulated with respect to its pressure preferably by a pressure regulator. This allows a pressure equilibrium between the gas within the drive section on the one hand and the pumping material in the pump section on the other hand. It is also possible to set the gas pressure to a slightly higher pressure as compared to the pressure of the pumping material. In addition to the seal between the rotary shaft and the bore of the partition, the gas pressure thereby assists in keeping pumping material away from the drive section.
However, it may nevertheless happen that, despite an operating seal and retention of the pumping material by means of an increased gas pressure in the drive section, some of the possibly aggressive pumping material reaches the drive section. According to the invention, a sump is therefore provided in the cavity of the drive section in which overflow pumping material is collected. The overflow pumping material can be pumped back to the pump section via a return line provided with a valve. The entire drive section is thus well protected against possible damages due to aggressive pumping material.
The

REFERENCES:
patent: 1928795 (1933-10-01), Reid
patent: 2911919 (1959-11-01), Tucker
patent: 3473475 (1969-10-01), Martini
patent: 3746472 (1973-07-01), Rupp
patent: 4065232 (1977-12-01), Stratieuko
patent: 4198191 (1980-04-01), Pierce
patent: 4836147 (1989-06-01), Morris
patent: 5368439 (1994-11-01), Piazza

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