Amphibious pump

Abstract

An amphibious pump is provided including a wet type motor with coolant and an absorbing mechanism of the expansion of the coolant inside the motor chamber, dividing it into two chambers, at least one expansion joint between an internal chamber of the motor, hermetically closed, and an equalization inner chambers and a means to equalize the internal pressure for the pumped fluid. The electric motor is immersed m a cooling liquid, usually oil, in a chamber, and, the other camera is filled with the aqueous solution, which communicates with the outside through the equalizer assembly, which can, for example, comprise a rubber mask with micro holes, which allows the exchange of water between the outer chamber and the chamber of the motor.

Description

TECHNICAL FIELD[0001]The present disclosure refers to a fluids pump which can work submerged or not, being generally known in the state of art as amphibious, equipped with art wet type electric motor filled with coolant typically an oil, which allows pumping fluids of high and low temperature and which operates at high pumping pressures. It has the application equipment in various areas, such as sanitation, mining, steelmaking, ethanol plants, industrial processes and others.BACKGROUND OF RELATED ART[0002]The state of art particularly refers to the submerged pumps with dry-type electric motors. In this type of pump the motor is protected by a mechanical seal system, which turns out to be a limiting factor in the pressure level that the pump can operate, as in the case of high pressures external to the motor housing runs the risk of breaking this mechanical seal, causing damage to the windings and motor bearings.[0003]In relation to the dry type pumps belonging to the state of techno...

AI Technical Summary

Benefits of technology

The present invention is an amphibious pump with a wet type motor and coolant that has a mechanism to absorb the expansion of the coolant inside the motor chamber. The technical solution is to create one expansion set in the motor chamber, which is divided into two chambers with at least one expansion joint between them. The expansion joint allows for equalization of the internal pressure of the pumped fluid. The electric motor is immersed in oil and the other camera is filled with an aqueous solution, which communicates with the outside through the equalizer assembly. The equalizer assembly can have a mask rubber with micro holes to allow for the exchange of water between the outer chamber and the chamber of the motor. This invention solves obstacles associated with pumps in environments that can be wet or underwater.

Problems solved by technology

In this type of pump the motor is protected by a mechanical seal system, which turns out to be a limiting factor in the pressure level that the pump can operate, as in the case of high pressures external to the motor housing runs the risk of breaking this mechanical seal, causing damage to the windings and motor bearings.

However, despite the totally dry submersible motor pump be capable of working under higher pressure conditions, it has its performance limited.

In addition, the totally dry submersible motor pump proposed by the PI8900494-9 presents an extremely complex assembly, with a considerable amount of components, which makes its cost of manufacturing and assembling high.

But these pumps are limited to working with low temperature fluids and only with low voltage motors, in Brazil up to 1000 volts.

Such a need is known in the state of technology, because In motors like this there is a greater heating of the internal liquid of the motor chamber, leading to boiling aqueous liquid and the collapse of the motor.

Now, requiring the use of oil or coolant, the technical problem is evident, since it is not acceptable to release the oil. or this coolant in the environment, neither the motor may receive water or an aqueous liquid, when the operation of the pressure equalizing assembly, as described in BR P10103598-3.

Thus, to date the amphibious pumps are limited to use low voltage motors.

However, being a completely closed system, the motor chamber would break, with consequent collapse thereof.

Also, when such pumps are subjected to high pressures, there tends to be a difference in internal pressure of the housing where the motor and external pressure is, between the pump and motor housing.

Elevated pressures tend causing the breakup of sealing seals or equivalent mechanisms.

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