Pneumatic powder spraying apparatus

Abstract

This invention opens one kind of gas dynamic powder spraying device which is composed with compression gas source,powder feed unit and spray mechanism.The spray mechanism includes gas heater and supersonic nozzle that is rigid linkage structure of coaxial setting.Gas heater includes metal shell,heat element and electrothermal insulator.One end of metal shell is fixed coaxial with the supersonic nozzle,the other end of metal shell is equipped with carrier gas joint and feed powder joint.The electrothermal insulator which is installed in the metal shell is composed with two coaxial emboitement internal and external tube,the center of the internal tube has a channel which two ends respectively connect powder feed unit and supersonic nozzle.In the exine of the internal tube,there are agroove gas direct channels which connect to the compress gas source,the heat element lies in the agroove gas direct channals.This invention which can be used to prepared monolayer and multi-layer coating widens industry application,reduces equipment weight,simplifies design structure and equipment maintanance and improves the spraying efficiency,being suitable for mechanical energy and metallurgy etc.

Description

technical field [0001] The invention relates to surface spraying treatment of materials, in particular to a gas power powder spraying device. Background technique [0002] In the prior art, relevant patent documents related to the gas power spraying device: 1. Russian patent, patent number 1674585 (патент Pφ №1674585, МКИC 23C 26 / 00, 1989.); 2. Chinese patent application, application number 01128130.8. The main structure of the above-mentioned device includes a compressed gas source, a powder feeder, a supersonic nozzle, a working gas heater, and a powder particle speed regulating system (including a control valve). The structural disadvantage of the above-mentioned device lies in its technical and functional limitations. In fact, the heater made of a long conduit has a working gas circulation pipe inside, which increases the size and weight of the heater and complicates its flexible use. [0003] Gas-powered powder spraying device, Russian patent, patent number 2190695 (Па...

AI Technical Summary

Problems solved by technology

The main structure of the above-mentioned device includes a compressed gas source, a powder feeder, a supersonic nozzle, a working gas heater, and a powder particle speed regulating system (including a control valve). The structural disadvantage of the above-mentioned device lies in its technical and functional limitations. In fact, the heater made of long pipes has a working gas circulation pipe inside, which increases the size and weight of the heater and complicates its flexible use

[0003] Gas-powered powder spraying device, Russian patent, patent number 2190695 (Патент Pφ №2190695, МКИC 23C 26 / 00, 20.04.2000r.), consists of a spraying mechanism and a control device, the two are connected by a hose, the spraying mechanism In order to be able to control the portable manual type from a long distance, it is composed of a supersonic nozzle and a gas heater rigidly connected. The disadvantage of the above structure is that the supersonic nozzle and the heater are not coaxially fixed, and the powder is sent from the powder feeder to the nozzle by a hose. The electric heating insulator of the gas heater has a straight-through gas conduit, which makes it difficult to install the heating element in it, and processing parallel ventilation pipes in the pipe of the electric heating insulator also increases the technical difficulty, and the supersonic nozzle is not the same as the gas heater. Coaxial reducer work efficiency

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