CN219372648U

CN219372648U - Jet plasma spray gun with Laval nozzle

Info

Publication number: CN219372648U
Application number: CN202320168895.4U
Authority: CN
Inventors: 万良庆; 张凯
Original assignee: Nanjing Prospect Electronic Technology Co ltd
Current assignee: Nanjing Prospect Electronic Technology Co ltd
Priority date: 2023-02-09
Filing date: 2023-02-09
Publication date: 2023-07-18
Anticipated expiration: 2033-02-09

Abstract

The utility model discloses a jet plasma spray gun of a Laval nozzle, which comprises a spray gun barrel, a spray head barrel and a nozzle which are connected in sequence; the connecting seat is in sealing connection with the spray gun cylinder; the connecting seat is provided with a high-voltage wire through hole and a high-voltage air through hole; a fixed seat and an electrode are arranged in the spray head cylinder; the electrode passes through the fixed seat and is fixed at the center of the circular fixed seat; the high-pressure air passing through the high-pressure air hole enters the spray gun barrel through the through hole on the surface of the fixing seat and is led to the electrode to provide atmosphere for the electrode so as to generate plasma gas, and the plasma gas flows to the nozzle; the spray head is a Laval nozzle; the laval nozzle comprises an expansion portion located at the outside, a throat portion and a constriction portion located at the inside; the length of the contraction portion in the direction in which the gun body extends is longer than the expansion portion. The gun can make the plasma flame full, and when the flow rate of the gun is insufficient, the flow rate can be increased through the Laval nozzle.

Description

Jet plasma spray gun with Laval nozzle

Technical Field

The utility model relates to the technical field of plasma equipment, in particular to a jet plasma spray gun with a Laval nozzle.

Background

A plasma spray gun is a device for continuously spraying low-temperature plasma air flow and is used for surface modification treatment of materials. The plasma is a fourth state of a substance, which is derived from a gas state but is different from the gas state, when the temperature of the gas state substance is raised to a certain temperature, the out-of-nuclear electrons can escape from the original orbit to become free electrons, and the number of the escaped electrons and the number of the nuclei losing electrons are equal, so that the number of positive charges and the number of negative charges of the whole system are equal, and the plasma is called as the plasma; the active particles generated by the method contain a large number of active particles such as electrons, ions, free radicals and the like, and the active particles collide and contact the surface of an object to be treated to generate corresponding physical or chemical reactions, so that the property of the surface of the material is changed or a new function is endowed, the purpose of modifying the material is achieved, and the requirements of practical application are met.

The application number of the application is CN201811388670.X, which has already been filed, discloses a direct injection type atmospheric low-temperature plasma processor and an operation method thereof, and the inventor improves a nozzle based on the fact that the spray gun does not have an acceleration effect on the flow speed of plasma in the input work, and needs to be relatively close to the surface to be processed.

Disclosure of Invention

1. The technical problems to be solved are as follows:

in order to solve the technical problems, the utility model provides a jet plasma spray gun of a Laval nozzle, which realizes remote plasma treatment by improving the nozzle.

2. The technical scheme is as follows:

a jet plasma spray gun of a Laval nozzle comprises a connecting seat, a spray gun barrel, a spray head barrel and a nozzle; the spray gun cylinder body, the spray head cylinder body and the spray nozzle are sequentially connected into an integrated shell structure; the connecting seat is in sealing connection with the spray gun cylinder; the connecting seat is provided with a high-voltage wire through hole and a high-voltage air through hole; the high-voltage wire through hole is used for penetrating through the high-voltage wire; the high-pressure gas through hole is used for passing high-pressure gas; a fixed seat and an electrode are arranged in the spray head cylinder; the electrode passes through the fixed seat and is fixed at the center of the circular fixed seat; the high-pressure air passing through the high-pressure air hole enters the spray gun barrel through the through hole on the surface of the fixing seat and is led to the electrode to provide atmosphere for the electrode so as to generate plasma gas, and the plasma gas flows to the nozzle; the spray head is a Laval nozzle; the laval nozzle comprises an expansion part positioned at the outer part, a throat part and a contraction part positioned at the inner part; the length of the contraction part along the extending direction of the gun body is longer than that of the expansion part.

Further, the tail part of the spray gun is also provided with a fixing bracket for fixing the spray gun; the fixed support is fixedly connected with the spray gun barrel.

Further, the plasma power supply and gas source device are also included; the high-voltage line through hole is communicated with a high-voltage line, and the high-voltage line connected with a plasma power supply provides high-voltage electricity for the electrode; the high-pressure air supply device is connected with the high-pressure air through hole pipeline to realize air supply to the spray gun.

3. The beneficial effects are that:

the application improves the existing jet plasma spray gun, the spray nozzle of the spray gun is improved by adopting a Laval nozzle, so that plasma flame is plumer, and when the flow rate of the spray gun is insufficient, the flow rate can be increased through the Laval nozzle.

Drawings

FIG. 1 is an exterior view of the present application;

FIG. 2 is a cross-sectional view of the present application;

FIG. 3 is an external view 2 of the present application;

fig. 4 is an enlarged view of the laval nozzle in the present application.

Detailed Description

The present utility model will be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 4, a laval nozzle jet plasma spray gun comprises a connecting seat 1, a spray gun barrel 2, a spray head barrel 3 and a nozzle 4; the spray gun cylinder body, the spray head cylinder body and the spray nozzle are sequentially connected into an integrated shell structure; the connecting seat is in sealing connection with the spray gun cylinder; the connecting seat is provided with a high-voltage wire through hole 5 and a high-voltage air through hole 6; the high-voltage wire through hole is used for penetrating through the high-voltage wire; the high-pressure gas through hole is used for passing high-pressure gas; a fixed seat 7 and an electrode 8 are arranged in the spray head cylinder; the electrode passes through the fixed seat and is fixed at the center of the circular fixed seat; the high-pressure air passing through the high-pressure air hole enters the spray gun barrel through the through hole on the surface of the fixing seat and is led to the electrode to provide atmosphere for the electrode so as to generate plasma gas, and the plasma gas flows to the nozzle; the spray head is a Laval nozzle; the laval nozzle comprises an expansion 41 at the outside, a throat 42 and a constriction 43 at the inside; the length of the contraction part along the extending direction of the gun body is longer than that of the expansion part.

Further, the tail part of the spray gun is also provided with a fixing bracket 9 for fixing the spray gun; the fixed support is fixedly connected with the spray gun barrel.

Specific examples:

step one, according to the shape of the surface to be treated, adjusting the height and angle of a corresponding low-temperature plasma spray gun nozzle, and enabling a treatment surface to be at a proper distance from a spray gun opening of the low-temperature plasma spray gun nozzle; step two, switching on an air source; starting a low-temperature plasma power supply, setting power and protection parameters by controlling a touch screen, and starting a starting switch; outputting a power supply, and discharging at a spray gun opening of the low-temperature plasma spray gun nozzle; and fourthly, pressing a stop button to stop working.

The power supply is a PSPT-1000S series low-temperature plasma high-frequency power supply.

While the utility model has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model, and it is intended that the scope of the utility model shall be limited only by the claims appended hereto.

Claims

1. A jet plasma spray gun of a Laval nozzle comprises a connecting seat, a spray gun barrel, a spray head barrel and a nozzle; the spray gun cylinder body, the spray head cylinder body and the spray nozzle are sequentially connected into an integrated shell structure; the connecting seat is in sealing connection with the spray gun cylinder; the connecting seat is provided with a high-voltage wire through hole and a high-voltage air through hole; the high-voltage wire through hole is used for penetrating through the high-voltage wire; the high-pressure gas through hole is used for passing high-pressure gas; a fixed seat and an electrode are arranged in the spray head cylinder; the electrode passes through the fixed seat and is fixed at the center of the circular fixed seat; the high-pressure air passing through the high-pressure air hole enters the spray gun barrel through the through hole on the surface of the fixing seat and is led to the electrode to provide atmosphere for the electrode so as to generate plasma gas, and the plasma gas flows to the nozzle; the spray head is a Laval nozzle; the laval nozzle comprises an expansion part positioned at the outer part, a throat part and a contraction part positioned at the inner part; the length of the contraction part along the extending direction of the gun body is longer than that of the expansion part.

2. A laval nozzle jet plasma spray gun as claimed in claim 1, wherein: the tail part of the spray gun is also provided with a fixing bracket for fixing the spray gun; the fixed support is fixedly connected with the spray gun barrel.

3. A laval nozzle jet plasma spray gun as claimed in claim 1, wherein: the plasma power supply and air source device are also included; the high-voltage line through hole is communicated with a high-voltage line, and the high-voltage line connected with a plasma power supply provides high-voltage electricity for the electrode; the high-pressure air supply device is connected with the high-pressure air through hole pipeline to realize air supply to the spray gun.