Sealing and pressure relief device for coal chemical pump

Abstract

The invention discloses a sealing and pressure relief device for a coal chemical pump. The device comprises a pump shaft, a telescopic ventilation cover, an exhaust pipe and an extension pipe; an impeller is arranged at the end part of the pump shaft; a rod body of the pump shaft is sleeved with a sealing throttling sleeve; a pump cover is arranged on the outer side of the sealing throttling sleeve; a throttling opening ring is arranged between the pump cover and the impeller; the impeller, the throttling opening ring, the sealing throttling sleeve and the pump cover form a pump cavity structure. A limiting ring is fixedly connected to the inner wall of the pump cover; the limiting ring matches a limiting rod; the limiting rod is of a cylindrical structure; the upper end of the limiting rod is fixedly connected to the bottom surface of a fixed plate; the telescopic ventilation cover is fixedly connected to the plate face of the fixed plate, the other end of the telescopic ventilation cover is fixedly connected to the inner wall of the pump cover, and a positioning ring is arranged on the surface of the fixed plate. The telescopic ventilation cover is arranged in the pump cavity andthe telescopic ventilation cover cooperates with the exhaust pipe to achieve sealing and pressure relief of the pump cavity; the device is simple in structure, convenient to operate and suitable forpopularization.

Description

technical field [0001] The invention relates to the technical field of chemical pumps, in particular to a sealing pressure relief device for coal chemical pumps. Background technique [0002] The chemical pump is an energy-saving pump designed jointly by the whole country. The performance and technical requirements of the pump are designed according to the performance and size stipulated in the international standard ISO2858. It can be divided into stainless steel chemical pumps, plastic chemical pumps, fluoroplastic chemical pumps, electric chemical pumps, Pneumatic chemical pump, but in actual use, the unstable air pressure inside the pump chamber affects the normal operation of the chemical pump. The traditional chemical pump has an air flow balance hole on the surface of the pump cover to relieve pressure, resulting in poor airtightness. Therefore, this The invention proposes a sealing pressure relief device for a coal chemical pump. Contents of the invention [0003]...

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Problems solved by technology

[0002] The chemical pump is an energy-saving pump jointly designed by the whole country. The performance and technical requirements of the pump are designed according to the performance and size specified in the international standard ISO2858. It can be divided into stainless steel chemical pumps, plastic chemical pumps, fluoroplastic chemical pumps, electric chemical pumps, Pneumatic chemical pump, but in actual use, the unstable air pressure inside the pump chamber affects the normal operation of the chemical pump. The traditional chemical pump has an air flow balance hole on the surface of the pump cover to relieve pressure, resulting in poor airtightness. Therefore, this Invention proposes a sealing pressure relief device for coal chemical pumps

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