Internal circulating cooling system and internal circulating cooling method of submersible electric pump motor

Abstract

The invention discloses an internal circulating cooling system and an internal circulating cooling method of a submersible electric pump motor. The internal circulating cooling system comprises a motor, a pump body and a vane wheel, wherein an output shaft of the motor extends into the pump body, the vane wheel is arranged in the pump body and fixed on an end portion of the output shaft of the motor, back vanes are respectively arranged on the rear end face of the vane wheel, a connection seat is connected between the pump body and the motor, a cooling water circulating water jacket is hermetically pressed between the connection seat and an upper end cover of the motor, a passageway serving as a circulating cooling chamber is formed between the inner sidewall of the cooling water circulating water jacket and a motor casing, a water inlet passageway and a water returning passageway are casted in the connection seat, a water inlet of the water inlet passageway is located, corresponding to outer circle portions of the back vanes, on the connection seat, a water outlet of the water inlet passageway and a water inlet of the water returning passageway are respectively communicated with the circulating cooling chamber, and a water outlet of the water returning passageway is located, corresponding to root portions of the back vanes, on the connection seat. According to above novel scheme of the internal circulating cooling system, a submersible electric pump structure is more compact and attractive in appearance, and production efficiency of the pump is improved, particularly in batch production of the pump.

Description

technical field [0001] The invention relates to the field of sewage treatment equipment and industrial equipment, in particular to an internal circulation cooling device and method for a submersible electric pump motor. Background technique [0002] Submersible electric pumps are widely used in municipal engineering, industry, agriculture, power stations and other fields. With the enhancement of people's awareness of environmental protection and the country's increasing emphasis on environmental protection, more than 1,000 urban sewage treatment plants will be built nationwide during the 12th Five-Year Plan; at the same time, the country's investment in the hydraulic industry has increased, and various related submersible pumps demand will increase significantly. At the same time, the requirements for pumps are becoming more and more stringent. For example, the liquid to be transported can be clean water or sewage containing various fibers or domestic waste. There are both ...

AI Technical Summary

Problems solved by technology

[0004] At present, the motor cooling method commonly used by submersible pump manufacturers is water cooling. A cooling water jacket is designed on the motor base, and the pipeline is drilled from the outlet flange of the pump to lead cold water to the motor water jacket, and hot water is drawn from the water jacket. The pipeline installed on the upper part leads to the suction port of the pump. This cooling method is effective but has many disadvantages. First, the on-site piping is quite cumbersome and requires professional plumbers; second, the height tolerance of the pump parts is accumulated during processing. Drilling errors in the angle and direction, length errors in steel pipe blanking, and various circumstances lead to the inability to assemble the pipes on site. After the forced assembly, the pipe joints will leak when the water pressure test is performed.

However, most users have more and more stringent requirements on the site environment. If there is a problem with the pipeline installation and continuous water leakage at the joint, on-site maintenance will be very difficult; third, how to connect the pipeline flow from the pump outlet is inconvenient to control, unless a gate valve is installed, and a manual gate valve is installed. The final flow can be adjusted, but the cost increases and it is easy to block. Fourth, this structure uses the same steel pipe, and it is larger. In order to prevent blockage, the high-lift pump will have a great impact on the efficiency of the pump when the flow is large. Insufficient cooling effect of motor due to low water volume

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