Backwind-preventing high-pressure-difference-resisting rotary feed valve

Abstract

The invention relates to a backwind-preventing high-pressure-difference-resisting rotary feed valve. An empty side of a feed valve housing is provided with two symmetric exhaust vents; high-pressure air leaked from a high-temperature pipeline to the empty side can be exhausted via the two exhaust vents in time to prevent upward backwind of the high-pressure air so that a material inside a hopper is prevented from being lifted, failing of normal discharging is prevented, thus the problem about influences on the discharging efficiency is solved, and damages, caused by the high-pressure air accumulated inside the housing, of a sealing ring are prevented as well; the end part of a rotary impeller is connected with a soft wear-resisting bar; the wear-resisting bar makes close contact with the inner wall of the housing so as to realize sealing between rotary blades and the inner wall of the housing and prevent air leakage from affecting the discharging; a scraping brush arranged on the feedvalve housing can be used for scraping away residual materials between the wear-resisting bar and the inner wall of the housing so as to prevent the sealing between the rotary impeller and the inner wall of the housing, and therefore the feed valve provided by the invention solves the problems about backwind and leakage of the air inside the feed valve, improves the conveying efficiency of air transportation and achieves great popularization and application values.

Description

technical field [0001] The invention relates to the technical field of pneumatic conveying devices, in particular to an anti-backwind and high-pressure resistant [0002] Poor rotary dosing valve. Background technique [0003] Pneumatic conveying technology uses compressed air to realize short-distance conveying of non-cohesive granular materials in pipelines. Pneumatic conveying has the advantages of cleanliness, environmental protection, safety, and high degree of automation. The rotary feed valve is a key part of the pneumatic conveying equipment. The upper end of the feed valve is often connected with the feed hopper. When working, the rotary impeller rotates in the cavity of the feed valve, and the material in the feed hopper falls into the feed hopper. When the rotary impeller rotates in the valve cavity, it is quickly moved to the discharge port at the lower end by the rotary impeller, and the discharge port is connected to a high-pressure conveying pipeline for high...

AI Technical Summary

Problems solved by technology

The rotary feed valve is a key part of the pneumatic conveying equipment. The upper end of the feed valve is often connected with the feed hopper. When working, the rotary impeller rotates in the cavity of the feed valve, and the material in the feed hopper falls into the feed hopper. When the rotary impeller rotates in the valve cavity, it is quickly moved to the discharge port at the lower end by the rotary impeller, and the discharge port is connected with a high-pressure conveying pipeline to carry out high-pressure pneumatic conveying of the material; the rotary feeding valve can realize high-pressure feeding of the material. The efficiency is continuous conveying, but because the outlet at the lower end is connected with a high-pressure gas source, a part of the high-pressure gas easily enters the empty material side of the feeding valve with the rotation of the rotating impeller, and is sprayed upward from the outlet of the feeding valve. Then the material in the hopper is lifted up to affect the normal feeding, which is called "return air"; in addition, the high-pressure gas accumulated in the feeding valve can easily damage the seal of the valve body, resulting in serious air leakage of the feeding valve, thereby reducing the pressure in the high-pressure pipeline. The delivery pressure; the rotary impeller in the traditional feed valve and the inner wall of the feed valve are often not tightly connected, resulting in the leakage of high-pressure gas

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