Composite cathode for plasma spray gun

Abstract

A composite cathode for a plasma spray gun relates to a cathode structure of the plasma spray gun and is formed by a cathode sleeve and a cathode head. The cathode sleeve is in a hollow rotation body structure; the cathode head is embedded to the inner space at the front portion of the cathode sleeve; the front end of the cathode head extends out of the cathode sleeve; the embedded section of the cathode head is in a cylinder structure; the inner space of the cathode sleeve at the back end of the cylinder structure forms a cooling cavity; the back end of the cylinder structure of the cathode head is a flow guidance cone which is reduced gradually backwards; the axis of the flow guidance cone is overlapped with the axis of the embedded section; the circumference of the flow guidance cone is provided with a plurality of cooling rib plates; the cooling rib plates and the cathode head are integrated in a radial arrangement manner; the flow guidance cone and the cooling rib plates are arranged in the cooling cavity; and spaces between the plurality of cooling rib plates form cooling branch grooves. According to the composite cathode, the cathode is divided into two components to carry out processing, thereby making production simple, improving processing efficiency of the components, and saving material cost; and the composite cathode is suitable for a washing cooling mode, and heat at the head portion of the cathode can be removed quickly.

Description

technical field [0001] The invention relates to plasma equipment, in particular to a cathode structure of a plasma torch. Background technique [0002] At present, plasma technology has been widely used, industrially used in plasma ignition, plasma spraying, metal smelting, plasma heating to manufacture nanomaterials, cutting, waste incineration and waste treatment, etc. The plasma treatment method is very different from the general method. Plasma is a state formed under the ionosphere or discharge phenomenon. With the discharge phenomenon, excited atoms, excited molecules, dissociated atoms, free atomic groups, Active chemicals of groups of atoms or molecular ions and their reactions resulting from collisions with other chemicals. In the plasma generator, the discharge effect causes the working gas molecules to lose the outer electrons and form an ion state, which generates high temperature through mutual collision, and the temperature can reach more than tens of thousands...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming that the cathode of the existing plasma spray gun is easily ablated, and to provide a composite cathode for the plasma spray gun, which is suitable for flushing and cooling, so that the cathode is not easy to be ablated, so as to prolong the plasma spray gun life cycle, improve production efficiency and save production costs

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