Method and structure for preventing explosion-proof submerged sewage pump orifice form generating friction spark and high temperature

Abstract

The invention is a method and a structure for preventing flame-proof diving sewage water pump mouth ring generating friction spark and high temperature, and the invention utilizes a method of adding mouth rings on a pump casing and an impeller, namely a pump casing mouth ring and an impeller mouth ring. The pump casing mouth ring is a fixed part which is fixed on the pump casing, the impeller mouth ring is fixed on the impeller and is a moving part rotating with the impeller, the radial clearance of the two mouth rings is 0.15-0.6 millimeters, the impeller and the pump casing are made of high strength metal materials, the pump casing is not made of metal materials any more but is the same with the impeller which is made of non-metal materials simultaneously, and the materials include polytetrafluoroethylene, imported sialon, graphite and polyurethane. The method and the structure have the advantages that because the pump casing mouth ring and the impeller mouth ring are made of non-metal materials, when accidents happen, moving and fixed parts in the small clearance of the two mouth rings can not generate friction spark when the moving part and the fixed part strike each other, simultaneously when the friction temperature is relatively high, the non-metal materials can be carbonized, thereby finishing friction without generating damages, namely achieving the flame-proof function.

Description

technical field [0001] The invention relates to a method and a structure for preventing friction sparks or high temperature at the mouth ring of an explosion-proof submersible sewage pump, and improving the explosion-proof safety performance of the product. It belongs to the technical field of explosion-proof submersible sewage pump products. Background technique [0002] At present, the mouth ring of the explosion-proof submersible sewage pump generally adopts the method that the pump shell is inlaid with the mouth ring, and the impeller is not inlaid with other materials. The pump casing mouth ring is made of copper alloy, stainless steel, hard alloy and other metal materials. The dynamic and static parts here are metal materials to metal materials. Since the general gap between the dynamic and static parts here is 0.15 ~ 0.6 mm, a However, if there is an accident, the metal parts will be rubbed against each other, which may cause friction sparks or high temperature, whic...

AI Technical Summary

Problems solved by technology

It is designed to solve the problem of sparks or high temperature caused by hard friction of moving and static parts (or hard particles inserted in the gap between the inlet rings in the medium) when an accident occurs at the mouth ring of the existing explosion-proof submersible sewage pump, thereby improving the explosion-proof safety performance of the product

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