CN201079755Y - Plasma spray gun - Google Patents

Abstract

The utility model belongs to a spraying device, and specifically relates to a plasma spraying gun. An air distribution ring (2) is arranged at the interval of an electrode tip (1) and a nozzle (6). The outside diameter of the air distribution ring (2) is smaller than the inner diameter of a cavity formed by the interval, and along the axial direction an end face of the air distribution ring (2) is connected with both sides of the interval in the axial direction. The air distribution ring (2) is provided with 2 to 8 through holes (7) along the radial direction used for communicating an air inlet (3) and the nozzle (6). Because the air occurs to rotate along an outer ring of the airflow distribution ring, and the air which enters an inner cavity of the nozzle by the through holes collides along with different directions, the ionization effect of the air is enhanced. Under the action of the rotational air, electric arcs compress towards the center and then the electric arch is prolonged and plasma air is fully heated. Therefore, the utility model has the advantage of favorable spraying effect.

Description

a plasma spray gun

technical field

The utility model belongs to spraying equipment, in particular to a plasma spray gun.

Background technique

Plasma spraying is the most widely used and most important thermal spraying process. Generally, plasma spraying equipment consists of six parts: spray gun, rectifier power supply, control system, heat exchange system, powder feeder, and water and electricity transfer box. Plasma spray gun is a plasma arc generator integrating water, electricity, gas and powder. It is mainly composed of nozzle, electrode, electrode rod, insulator, water channel head and so on. The plasma spray gun is the key to the whole system, the design of the spray gun directly affects whether the spray system can work normally and the quality of the spray coating. When spraying with ordinary plasma spray gun, when the gas enters the nozzle from the air inlet, there will be no gas swirl, and the gas ionization is not sufficient, resulting in low bonding strength and hardness of the coating, high porosity of the coating, and poor spraying effect .

Contents of the invention

The purpose of the utility model is to provide a plasma spray gun which makes the gas swirl and ionize more fully, thereby improving the spraying effect.

The utility model is achieved in the following way: a plasma spray gun, which includes an electrode head, a nozzle which is insulated from the electrode head through an insulator and maintains a gap, and an air intake pipe which communicates with the nozzle through the gap; between the electrode head and the nozzle A gas distribution ring is provided at the gap, the outer diameter of the gas distribution ring is smaller than the inner diameter of the cavity formed by the gap, the end face of the gas distribution ring along the axial direction connects the two axial sides of the gap, and the gas distribution ring is arranged along the radial direction There are 2 to 8 through holes for guiding the intake pipe and the nozzle.

In the present utility model, since a gas distribution ring is provided at the gap between the electrode head and the nozzle, the outer diameter of the gas distribution ring is smaller than the inner diameter of the cavity formed by the gap, and the gas will rotate along the outer ring of the gas distribution ring; The end face of the gas distribution ring along the axial direction connects the two axial sides of the gap, and the gas distribution ring is provided with 2 to 8 through holes along the radial direction, which are used to guide the intake pipe and the nozzle, so that the gas can only enter through the through holes into the nozzle cavity. Because the gas rotates along the outer ring of the airflow distribution ring, and the gas entering the inner cavity of the nozzle from the through hole collides in different directions, which enhances the ionization effect of the gas, thereby improving the spraying effect. In addition, in the utility model , The arc is compressed towards the center under the action of the rotating gas, so that the arc is elongated, which makes the plasma gas fully heated and improves the spraying effect. Therefore, the utility model has the advantage that the spraying effect is better.

Description of drawings

Fig. 1 is the structural representation of the plasma spray gun of the present utility model;

Fig. 2 is a schematic diagram of the gas distribution ring of the present invention.

In the figure, 1 electrode tip, 2 gas distribution ring, 3 inlet pipe, 4 water inlet pipe, 5 insulator, 6 nozzle, 7 through hole.

Detailed ways

As shown in Figures 1 to 2, a plasma spray gun includes an electrode head 1, a nozzle 6 that is insulated from the electrode head 1 through an insulator 5 and maintains a gap, and an air inlet pipe 3 that communicates with the nozzle 6 through the gap. A water inlet pipe 4 is provided on the outside of the nozzle, and a gas distribution ring 2 is provided at the gap between the electrode head 1 and the nozzle 6. The outer diameter of the gas distribution ring 2 is smaller than the inner diameter of the cavity formed by the gap, and the gas distribution The end surface of the ring 2 along the axial direction is connected to the two axial sides of the gap, and the gas distribution ring 2 is provided with 2 to 8 through holes 7 along the radial direction, which are used for leading the intake pipe 3 and the nozzle 6 .

In the utility model, the outer diameter of the gas distribution ring 2 is smaller than the inner diameter of the cavity formed by the gap, so the gas will rotate along the outer ring of the gas distribution ring; the gas distribution ring is connected to the shaft of the gap along the axial end face On both sides, the gas distribution ring is provided with 2 to 8 through holes along the radial direction, which are used to guide the air inlet and the nozzle, so that the gas can only enter the inner cavity of the nozzle through the through holes. Because the gas rotates along the outer ring of the gas flow distribution ring 2, and the gas entering the inner cavity of the nozzle from the through hole collides in different directions, which enhances the ionization effect of the gas, thereby improving the spraying effect. A high no-load voltage is applied between the nozzle 3 and the electrode tip 1, and the arc is ignited by the high-frequency arc ignition device. Under the action of the strong vortex air flow, the arc is compressed to the center and drawn out of the nozzle. nozzle exit face. The arc column is stretched to more than 130mm, the arc voltage is up to 400V, and the arc power is up to 200KW when the arc current is 500A. With such a long arc column and high power, the plasma gas can be fully heated, and a high-speed plasma jet is generated when the extremely high-temperature plasma gas leaves the nozzle.

Claims (1)

1. a plasma spray gun, it comprises electrode tip (1), and electrode tip (1) is insulated by insulator (5) and keeps the nozzle (6) of gap, communicates with described nozzle (6) by described gap The gas inlet (3) is characterized in that a gas distribution ring (2) is provided at the gap between the electrode tip (1) and the nozzle (6), and the outer diameter of the gas distribution ring (2) is smaller than the The inner diameter of the cavity formed by the gap, the end face of the gas distribution ring (2) along the axial direction connects the two axial sides of the gap, and the gas distribution ring (2) is provided with 2 to 8 through holes (7) along the radial direction. To guide the air inlet (3) and the nozzle (6).

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