CN216960287U - An air-cooled plasma generator and its anode electrode - Google Patents

Abstract

The utility model relates to the technical field of plasma generators, in particular to an air-cooled plasma generator and an anode electrode thereof, which comprise an anode main body and a backflow cover, wherein the backflow cover is arranged at the front end of the anode main body; the cross section of the anode main body is an annular surface and is provided with a central arc channel and a plurality of cooling cavities distributed along the circumference of the central arc channel, the cavity inner space of each cooling cavity forms an air inlet channel, and a backflow channel is formed between the peripheral space of each cooling cavity and the backflow cover. The utility model adopts the gas cooling mode of gas reflux to carry out cooling, can avoid the cooling liquid from participating in the reaction during liquid cooling, has more simplified structure compared with the liquid cooling, and has strong practicability, long service life, high safety and wider application range.

Description

An air-cooled plasma generator and its anode electrode

technical field

The utility model relates to the technical field of plasma generators, in particular to an air-cooled plasma generator and an anode electrode thereof.

Background technique

Arc plasma is now widely used in arc plasma ignition, plasma cutting, plasma spraying and other fields of pulverized coal boilers. The traditional plasma electrode has a high working temperature. Except for low-power, intermittent cutting and welding plasma can be air-cooled. High-power plasma electrodes must use liquid cooling for long-term operation, but the liquid-cooled coolant is easy to participate in the reaction, and the plasma generator will consume part of the power supply due to the presence of a certain magnetic hysteresis in the coolant in the cooling device, reducing the plasma generator. efficiency. However, the existing low-power cutting and welding air-cooled plasma anode electrodes have the problems of unreasonable cooling structure and poor heat dissipation effect.

Utility model content

The purpose of the utility model is to provide an air-cooled plasma generator and its anode electrode, and to optimize the gas circuit structure of the anode section of the plasma generator to overcome the deficiencies in the prior art.

The embodiments of the present invention are realized by the following technical solutions: an anode electrode of an air-cooled plasma generator, comprising an anode main body and a return cover, and the return cover is installed at the front end of the anode main body;

The cross section of the anode body is an annular surface, and has a central arc channel and a plurality of cooling cavities distributed along the circumference of the central arc channel. The inner space of the cooling cavity constitutes an air intake channel, and the outer space of the cooling cavity A return channel is formed between it and the return cover.

According to a preferred embodiment, the air inlet channels are distributed axially along the annular surface of the anode body, and lead to the opposite direction of the plasma jet from the return channel.

According to a preferred embodiment, the diameter of the cooling cavity gradually decreases from the intake channel to the return channel.

According to a preferred embodiment, the central arc channel is composed of a working gas inlet, a compression channel and a nozzle connected in sequence, and the inner diameter of the central arc channel from the working gas inlet to the nozzle is in a state of first decreasing and then increasing.

According to a preferred embodiment, the anode body is screwed to the return cap.

According to a preferred embodiment, the anode body is made of a material with high electrical conductivity and high thermal conductivity.

According to a preferred embodiment, the anode body is made of red copper.

According to a preferred embodiment, the reflow cover is made of a material that is resistant to high temperature and oxidation.

According to a preferred embodiment, the material of the reflux cover is 310S stainless steel.

The utility model also provides an air-cooled plasma generator, comprising the anode electrode as described above.

The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects: (1) Cooling is carried out by adopting the air cooling method of gas reflux, which can avoid the cooling liquid participating in the reaction during liquid cooling; (2) By optimizing the anode cooling structure , opening multiple cooling cavities, increasing the heat dissipation area, improving the heat dissipation efficiency and heat dissipation effect; (3) Compared with the liquid cooling structure, it is more simplified, has strong practicability, long life, high safety and wider application range.

Description of drawings

1 is a schematic structural diagram of an anode electrode provided in Embodiment 1 of the present utility model;

2 is a schematic structural diagram of a cross-section of an anode body provided in Embodiment 1 of the present utility model;

Icons: 1- anode body, 2- return cover, 3- center arc channel, 301- working gas inlet, 302- compression channel, 303- spout, 4- cooling chamber, 401- intake channel, 402- return channel, 403 - Cooling 1 inlet for cooling gas, 5 - swirling working gas, 6 - cooling gas, 7 - plasma jet.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Example 1

According to the research of the applicant, the traditional plasma electrode has a high working temperature, except that the low-power, intermittently-operated cutting and welding plasma can be cooled by air, and the high-power plasma electrode must use liquid cooling for long-term operation. The liquid is easy to participate in the reaction, and the plasma generator will consume a part of the power supply due to the certain hysteresis of the cooling liquid in the cooling device, reducing the efficiency of the plasma generator. However, the existing low-power cutting and welding air-cooled plasma anode electrodes have the problems of unreasonable cooling structure and poor heat dissipation effect.

Therefore, the embodiments of the present invention provide an air-cooled plasma generator and an anode electrode thereof, and the gas circuit structure of the anode section of the plasma generator is optimized to overcome the deficiencies in the prior art.

Referring to FIG. 1 , FIG. 1 is a schematic structural diagram of an anode electrode provided in Embodiment 1 of the present invention.

An anode electrode of an air-cooled plasma generator, comprising an anode main body 1 and a return cover 2, the return cover 2 is installed at the front end of the anode main body 1; the anode main body 1 is an annular surface in cross section and has a central arc channel 3 and a plurality of cooling cavities 4 distributed along the circumference of the central arc channel 3, referring to FIG. 2, which shows a cross-section of the anode body 1 in the form of an annular surface.

The inner space of the cooling cavity 4 constitutes an intake channel 401 , and a return channel 402 is constituted between the outer space of the cooling cavity 4 and the return cover 2 . Further, the air inlet channels 401 are axially distributed along the annular surface of the anode body 1 , and are conducted to the opposite direction of the plasma jet 7 by the return channel 402 . In the actual cooling process, the cooling gas 6 enters the cooling gas inlet 403 and then reaches the return passage 402 along the intake passage 401. The return passage 402 makes the cooling gas 6 flow in the opposite direction to the plasma jet 7, and finally reverse discharge occurs. This prevents the cooling gas 6 from affecting the plasma jet 7 . It should be noted that a sufficient amount of air needs to be maintained during the operation of the cooling chamber 4, so that a large amount of heat can be taken away through the cooling chamber 4, so as to prevent the anode from melting under the burning of the high-temperature arc, and prolong the service life of the anode.

Further, the diameter of the cooling chamber 4 gradually decreases from the intake passage 401 to the return passage 402. With the above structure, the cooling gas 6 can effectively speed up the flow rate after entering, thereby improving the heat dissipation effect.

Further, the central arc channel 3 is composed of a working gas inlet 301, a compression channel 302 and a nozzle 303 that are connected in sequence, and the inner diameter of the central arc channel 3 from the working gas inlet 301 to the nozzle 303 is first decreased and then increased. state. It should be noted that when the swirling working gas 5 forming the arc enters the working gas inlet 301 and is effectively compressed in the compression channel 302 and then enters the enlarged nozzle 303, the arc is effectively amplified and directly ejected from the nozzle 303 to form a plasma jet 7 . It should be noted that the inner diameter from the working gas inlet 301 to the nozzle 303 through the central arc channel 3 is designed in a state of first decreasing and then increasing. The above structure is conducive to arc divergence and can effectively prolong the service life of the anode.

The anode body 1 is screwed with the return cover 2 . Wherein, the anode body 1 is made of red copper material with high electrical conductivity and high thermal conductivity; the reflow cover 2 is made of 310S stainless steel material with high temperature resistance and oxidation resistance.

The embodiment of the present invention also provides an air-cooled plasma generator, which includes the anode electrode as described above.

To sum up, the technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects: (1) air cooling is adopted for cooling, which can prevent the cooling liquid from participating in the reaction during liquid cooling; (2) by cooling the anode structure Optimized, multiple cooling cavities are opened, which increases the heat dissipation area, improves the heat dissipation efficiency and heat dissipation effect; (3) Compared with the liquid cooling structure, it is more simplified, with strong practicability, long life, high safety and wider application range. .

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

1. The anode electrode of the air-cooled plasma generator is characterized by comprising an anode main body (1) and a backflow cover (2), wherein the backflow cover (2) is arranged at the front end of the anode main body (1);

the cross section of the anode main body (1) is an annular surface and is provided with a central arc channel (3) and a plurality of cooling cavities (4) distributed along the circumference of the central arc channel (3), the cavity inner space of each cooling cavity (4) forms an air inlet channel (401), and a backflow channel (402) is formed between the peripheral space of each cooling cavity (4) and the backflow cover (2).

2. The air-cooled plasma generator anode electrode according to claim 1, characterized in that the air inlet channels (401) are distributed axially along the annular surface of the anode body (1) and are conducted by the return channel (402) to the opposite direction of the plasma jet (7).

3. The air-cooled plasma generator anode electrode according to claim 1, wherein the diameter of the cooling chamber (4) is gradually reduced from the inlet passage (401) to the return passage (402).

4. The gas-cooled plasma generator anode electrode according to claim 1, wherein the central arc passage (3) is composed of a working gas inlet (301), a compression passage (302), and a nozzle (303) which are connected in sequence, and the inner diameter of the central arc passage (3) from the working gas inlet (301) to the nozzle (303) is changed in a state of decreasing first and then increasing.

5. The air-cooled plasma generator anode electrode according to claim 1, wherein the anode body (1) is screwed with the return cover (2).

6. The anode electrode for air-cooled plasma generator according to any of claims 1 to 5, wherein the anode body (1) is made of material with high electrical and thermal conductivity.

7. The anode electrode for the air-cooled plasma generator according to claim 6, wherein the anode body (1) is made of red copper.

8. The anode electrode of the air-cooled plasma generator according to any of claims 1 to 5, wherein the return cover (2) is made of a material resistant to high temperature and oxidation.

9. The anode electrode of the air-cooled plasma generator according to claim 8, wherein the material of the return cover (2) is 310S stainless steel.

10. An air-cooled plasma generator comprising the anode electrode according to any one of claims 1 to 9.

Images