Sand prevention device of submersible pump motor

Abstract

The invention provides a sand control device for a submersible pump motor, which includes a motor casing, a motor shaft, a sealing end cover, a skeleton oil seal and a sand throwing ring, wherein the sand throwing ring is sleeved on the motor shaft and is located above the sealing end cover; the sealing end The cover includes an upper sealing end cover and a lower sealing end cover. A plane and a positioning circular step are processed on the inner side of the upper sealing end cover. The skeleton oil seal is fixedly installed on the positioning circular step. Between the skeleton oil seal and the lower sealing end cover, the top end of the edge of the lower sealing end cover is sealed and welded to the shell wall of the motor casing. The invention has the beneficial effects of good sealing performance and high production efficiency, can effectively prevent mud and sand from entering the motor, and improve the service life of the submersible motor.

Description

technical field [0001] The invention relates to a sealing structure, in particular to a sand control device for a submersible pump motor. Background technique [0002] The submersible motor works in water, and anti-silt and water tightness are one of the important characteristics of the submersible motor. Existing submersible motors have strict requirements on the water quality of the conveyed water. The national standard stipulates that the content of mud and sand in the water is not more than 0.01%, but in actual work, it is often much greater than this value, because mud and sand can easily enter between the motor shaft and the dynamic seal. , so that the motor shaft and seal are damaged early due to the rapid wear of mud and sand, thereby greatly reducing the service life of the submersible motor, affecting the work progress, and increasing the cost. At present, some submersible motors only set a sand sealing cover on the upper end of the sealing groove of the submersib...

AI Technical Summary

Problems solved by technology

Existing submersible motors have strict requirements on the water quality of the conveyed water. The national standard stipulates that the content of mud and sand in the water is not more than 0.01%, but in actual work, it is often much greater than this value, because mud and sand can easily enter between the motor shaft and the dynamic seal. , so that the motor shaft and seal are damaged early due to the rapid wear of mud and sand, which greatly reduces the service life of the submersible motor, affects the work progress, and increases the cost

At present, some submersible motors only set a sand sealing cover on the upper end of the sealing groove of the submersible motor. This setting cannot effectively block the mud and sand, so that the mud and sand will accumulate in the sealing groove of the submersible motor through the sand sealing cover. Through the continuous rotation of the submersible motor, the The mud and sand are brought into the interior of the submersible motor, reducing the service life of the submersible motor

The sand-proof structure of some submersible motors uses a cast iron sand throwing ring to connect the motor shaft through a flat key, and the upper part of the sand throwing ring is a plane, but there is a gap at the connection in this way, which is easy to accumulate mud and sand, which will cause mud and sand to pass through the gap along the motor shaft. The shaft enters the inner cavity of the guide bearing seat, eventually causing rapid wear of the oil seal and guide bearing, and even burning the motor

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