CN214544896U

CN214544896U - Plasma generator

Info

Publication number: CN214544896U
Application number: CN202120821196.6U
Authority: CN
Inventors: 张兴; 呼志杰; 蔡飞; 于庆雷; 姜国财; 范景利; 张柯; 孙宇光; 梁强; 韦光辉
Original assignee: Yantai Longyuan Power Technology Co Ltd
Current assignee: Yantai Longyuan Power Technology Co Ltd
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-10-29
Anticipated expiration: 2031-04-21

Abstract

The present disclosure provides a plasma generator having a cooling flow passage for a cooling medium to flow, comprising: the first electrode is of a cylindrical structure, an arc channel arranged along the axial direction of the first electrode is formed in the hollow part of the first electrode, and the cooling flow channel comprises an electrode cooling flow channel arranged in the cylinder wall of the first electrode; the cooling flow channel comprises a sleeve inflow channel and a sleeve outflow channel which are arranged inside the cylinder wall of the supporting sleeve, and the sleeve inflow channel and the sleeve outflow channel are communicated with the electrode cooling flow channel; and a second electrode disposed within the sleeve cavity coaxially with the support sleeve. The plasma generator is beneficial to fast loading or unloading the first electrode, and is convenient to install and maintain.

Description

Plasma generator

Technical Field

The present disclosure relates to the field of plasma technology, and more particularly, to a plasma generator.

Background

At present, the plasma ignition and stable combustion technology of the utility boiler is widely applied to coal-fired power plants. Arc plasma generators, one of the core devices of this technology, are demanding more on lightweight, compact, and efficient product structures.

SUMMERY OF THE UTILITY MODEL

The purpose of this disclosure is to provide a plasma generator which facilitates quick installation or extraction of a first electrode and is convenient to install and maintain.

The present disclosure provides a plasma generator having a cooling flow passage for a cooling medium to flow, comprising:

the cooling flow channel comprises an electrode cooling flow channel arranged in the cylinder wall of the first electrode;

the cooling flow channel comprises a sleeve inflow channel and a sleeve outflow channel which are arranged inside the cylinder wall of the supporting sleeve, and the sleeve inflow channel and the sleeve outflow channel are communicated with the electrode cooling flow channel; and

a second electrode disposed within the sleeve cavity coaxially with the support sleeve.

In some embodiments, the second electrode has a non-contacting overlapping segment between an end of the second electrode near an axial direction of the first electrode and the first end of the first electrode.

In some embodiments, the electrode cooling flow channel comprises:

a first electrode cooling flow passage in communication with the sleeve inflow channel; and

and the second electrode cooling flow channel is positioned at the downstream of the first electrode cooling flow channel along the flowing direction of the cooling medium and is communicated with the sleeve outflow channel, and the first electrode cooling flow channel is positioned at the radial inner side of the second electrode cooling flow channel.

In some embodiments, the first electrode cooling flow channel is separated from the second electrode cooling flow channel by a spacer.

In some embodiments, the cooling flow passage comprises:

an electrode inlet channel disposed at a first end of the first electrode, the first electrode cooling flow channel in communication with the sleeve inlet channel through the electrode inlet channel; and/or

And the electrode outflow channel is arranged at the first end of the first electrode, and the second electrode cooling flow channel is communicated with the sleeve outflow channel through the electrode outflow channel.

In some embodiments, the plasma generator comprises:

the first flow guiding device is arranged in the cooling flow channel and is configured to provide flowing power of a cooling medium; and/or

The second drainage device is arranged between the second electrode and the support sleeve and is configured to provide flowing power of working medium gas.

In some embodiments, the plasma generator further comprises an insulator disposed between the second electrode and the support sleeve.

In some embodiments of the present invention, the,

an electrode positioning step is arranged at the first end of the first electrode;

one end of the support sleeve connected with the first electrode is provided with a sleeve positioning step, and the electrode positioning step is abutted against the end face of the sleeve positioning step and/or is matched with the circumferential face of the sleeve positioning step.

In some embodiments of the present invention, the,

a first sealing groove is formed between the first electrode and the supporting sleeve, a first sealing ring is arranged in the first sealing groove, and the first sealing ring is located between the sleeve cavity and the sleeve inflow channel along the radial direction of the supporting sleeve; and/or

A second sealing groove is formed between the first electrode and the supporting sleeve, a second sealing ring is arranged in the second sealing groove, and the second sealing ring is located on the outer side of the sleeve outflow channel along the radial direction of the supporting sleeve; and/or

A third sealing groove is formed between the first electrode and the supporting sleeve, a third sealing ring is arranged in the third sealing groove, and the third sealing ring is located between the sleeve inflow channel and the sleeve outflow channel along the radial direction of the supporting sleeve.

In some embodiments, the first electrode is provided at its outer periphery with a snap-fit portion for engaging with a tool when the first electrode is mounted on or removed from the support sleeve.

Based on this plasma generator that discloses provides, the cooling runner sets up in the section of thick bamboo wall of first electrode and in the section of thick bamboo wall of support sleeve, and the first end screw-thread fit connection of support sleeve and first electrode does benefit to and packs into fast or takes out first electrode, and the installation is maintained conveniently.

The plasma generator is beneficial to reducing the outer diameter size, realizes the light structure of the plasma generator, is beneficial to reducing the weight of the generator, can enhance the maintenance convenience of equipment and reduce the material cost consumption.

The plasma generator is beneficial to better matching with the combustor, is beneficial to the arrangement of a primary air flow field of the combustor, and promotes combustion adjustment.

The smaller product volume and weight of the plasma generator are more convenient to install and apply, and especially more convenient for boilers with narrow external space.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 is a schematic cross-sectional structural view of a plasma generator according to an embodiment of the present disclosure;

FIG. 2 is a schematic perspective view of a first electrode of the plasma generator of the embodiment shown in FIG. 1;

FIG. 3 is a schematic front view of the first electrode shown in FIG. 2;

fig. 4 is a schematic sectional view of the first electrode shown in fig. 3 along the direction a-a.

Reference numerals in the drawings indicate:

1-a first electrode; 11-an arc path; 12-a first thread; 15-electrode positioning step;

2-a support sleeve; 21-sleeve inflow channel; 22-sleeve outflow channel;

3-a second electrode;

51-a first seal groove; 52-a second seal groove; 53-third seal groove;

6-spacer bush; 61-a first electrode cooling flow channel; 62-a second electrode cooling flow channel; 63-electrode inflow channel; 64-an electrode outflow channel;

81-a first drainage device; 82-a second drainage device;

91-insulating member.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present disclosure.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are presented only for the convenience of describing and simplifying the disclosure, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

The disclosed embodiments provide a plasma generator. As shown in fig. 1 to 4, the plasma generator has a cooling flow passage through which a cooling medium flows. The plasma generator includes: a first electrode 1, a support sleeve 2 and a second electrode 3.

The first electrode 1 is in a cylindrical structure, an arc channel 11 arranged along the axial direction of the first electrode 1 is formed in the hollow part of the first electrode 1, and the cooling flow channel comprises an electrode cooling flow channel arranged in the cylindrical wall of the first electrode 1.

The supporting sleeve 2 and the first electrode 1 are coaxially arranged at the first axial end of the first electrode and are in threaded connection with the first axial end of the first electrode 1, the sleeve cavity of the supporting sleeve 2 is communicated with the arc channel 11, the cooling flow channel comprises a sleeve inflow channel 21 and a sleeve outflow channel 22 which are arranged inside the cylinder wall of the supporting sleeve 2, and the sleeve inflow channel 21 and the sleeve outflow channel 22 are communicated with the electrode cooling flow channel.

A second electrode 3 is provided within the sleeve cavity coaxially with the support sleeve 2.

The cooling flow channel of the plasma generator is arranged in the cylinder wall of the first electrode 1 and the cylinder wall of the supporting sleeve 2, the supporting sleeve 2 is in threaded fit connection with the first end of the first electrode 1, the first electrode 1 can be conveniently and rapidly installed or pulled out, and installation and maintenance are convenient.

The smaller product volume and weight of the plasma generator are more convenient to install and apply, and especially more convenient for boilers with narrow external space. As shown in fig. 1 and 4, the electrode cooling channels include a first electrode cooling channel 61 and a second electrode cooling channel 62. The first electrode cooling flow passage 61 communicates with the sleeve inflow passage 21. The second electrode cooling flow channel 62 is located downstream of the first electrode cooling flow channel 61 in the flow direction of the cooling medium, and communicates with the sleeve outflow passage 22. The first electrode cooling flow channel 61 is located radially inward of the second electrode cooling flow channel 62. This setting does benefit to plasma generator's first electrode 1 and external environment and keeps apart better, realizes better cooling effect.

As shown in fig. 1 and 4, in some embodiments, the first electrode cooling channel 61 is separated from the second electrode cooling channel 62 by a spacer 6. The separation of the first electrode cooling channel 61 from the second electrode cooling channel 62 by the spacer 6 facilitates the manufacture of the first electrode 1.

The form of the first electrode cooling channel 61 and the second electrode cooling channel 62 may be set according to cooling requirements. The first electrode cooling channel 61 may be a first annular channel; and/or the second electrode cooling flow channels 62 are second annular channels; and/or the first electrode cooling flow channel 61 comprises a plurality of first sub-flow channels arranged side by side; and/or the second electrode cooling flow channel 62 includes a plurality of second sub-flow channels arranged side-by-side. The first sub-flow passage may be, for example, a first axial sub-flow passage or a first helical sub-flow passage. The second sub-flow passage may be, for example, a second axial sub-flow passage or a second helical sub-flow passage.

In the embodiment shown in fig. 1-4, the first electrode cooling channel 61 may be a first annular channel and the second electrode cooling channel 62 may be a second annular channel. This arrangement can simplify the structure of the first electrode cooling flow passage 61 and the second electrode cooling flow passage 62, and facilitate the manufacture of the first electrode 1.

As shown in fig. 1 and 4, in some embodiments, the cooling flow channels include an electrode inflow channel 63 and an electrode outflow channel 64. An electrode inflow passage 63 is provided at a first end of the first electrode 1, and the first electrode cooling flow passage 61 and the sleeve inflow passage 21 communicate through the electrode inflow passage 63. An electrode outflow passage 64 is provided at a first end of the first electrode 1, and the second electrode cooling flow passage 62 and the sleeve outflow passage 22 communicate through the electrode outflow passage 64.

In addition, as shown in fig. 1 and 4, the plasma generator may include a first flow guide device 81, and the first flow guide device 81 is disposed in the cooling flow passage and configured to provide a flow power of the cooling medium. In some embodiments, the first flow directing device 81 may be disposed within the first electrode cooling flow channel 61. Optionally, the first flow-directing device 81 is used to direct the cooling medium in a spiral flow.

As shown in fig. 1, the plasma generator may comprise a second flow directing device 82. The second flow guiding device 82 is arranged between the second electrode 3 and the support sleeve 2 and is configured to provide flowing power of the working medium gas. Optionally, the second flow directing device 82 is used to direct a helical flow of the working gas.

As shown in fig. 1 and 4, the first end of the first electrode 1 is provided with an electrode positioning step 15. As shown in fig. 1, one end (second end) of the support sleeve 2 connected to the first electrode 1 has a sleeve positioning step, and the electrode positioning step 15 abuts against an end face of the sleeve positioning step. This arrangement makes it possible to achieve an axial positioning of the first electrode 1 and the support sleeve 2.

In addition, as shown in fig. 1, the electrode positioning step 15 is fitted to the peripheral surface of the sleeve positioning step. This arrangement makes it possible to achieve a radial positioning of the first electrode 1 and the support sleeve 2.

As shown in fig. 1 to 4, in some embodiments, the first electrode 1 is provided with a snap-fit portion 4 on its outer circumference for engaging with a tool when the first electrode 1 is attached to or detached from the support sleeve 2. The cross-section of the snap-fit portion 4 perpendicular to the axis of the first electrode 1 may be, for example, a polygonal structure.

Embodiments of the disclosure are further described below with reference to fig. 1-4. The interior of the first electrode 1 is provided with an arc channel 11 in the direction from the first end to the second end (from left to right in fig. 1 to 4) of its axial direction. The arc channel 11 is arranged along the axial direction of the first electrode 1 and is used for passing through working medium gas plasma arc.

Optionally, the first electrode 1 is made of a copper alloy material and is used for providing power electric transmission required by the arc plasma generator and ensuring the normal operation of the plasma generator.

The first end of the support sleeve 2 is used for inputting working medium gas and inputting and outputting cooling medium. The second end of the support sleeve 2 is screwed to the first end of the first electrode 1 for rapid insertion and extraction of the first electrode 1. The sleeve cavity of the support sleeve 2 communicates with the arc channel 11. The support sleeve 2 is used to support the first electrode 1.

The second electrode 3 is arranged in the cavity of the sleeve and is arranged along the axial direction of the first electrode 1, and a non-contact overlapping section is arranged between the end part of the axial second end of the second electrode 3 and the first end of the first electrode 1. Namely: the end portion of the second electrode 3 is located within the arc channel 11 of the first electrode 1.

The working medium gas enters a non-contact overlapping section between the second electrode 3 and the first electrode 1 through the area between the second electrode 3 and the supporting sleeve 2, voltage is generated through the non-contact overlapping section of the first electrode 1 and the second electrode 3 to break down the working medium gas to initiate an arc, a plasma arc is formed, and the plasma arc flows along the arc channel 11.

In some embodiments, the plasma generator further comprises an insulator 91, the insulator 91 being disposed between the second electrode 3 and the support sleeve 2. As shown in fig. 1, a first insulator 91 is provided at a portion of the second electrode 3 facing the support sleeve 2. The first insulator 91 forms an insulating layer between the second electrode 3 and the support sleeve 2.

As shown in fig. 1, in some embodiments, a first sealing groove 51 is disposed between the first electrode 1 and the support sleeve 2, and a first sealing ring is disposed in the first sealing groove 51 and located between the sleeve cavity and the sleeve inflow channel 21 along the radial direction of the support sleeve 2; and/or a second sealing groove 52 is arranged between the first electrode 1 and the support sleeve 2, a second sealing ring is arranged in the second sealing groove 52, and the second sealing ring is positioned outside the sleeve outflow channel 22 along the radial direction of the support sleeve 2; and/or a third sealing groove 53 is arranged between the first electrode 1 and the support sleeve 2, a third sealing ring is arranged in the third sealing groove 53, and the third sealing ring is positioned between the sleeve inflow channel 21 and the sleeve outflow channel 22 along the radial direction of the support sleeve 2.

The above embodiment is advantageous in improving the sealing performance between the first electrode 1 and the support sleeve 2.

As shown in fig. 1 and 4, a first seal groove 51 is provided between the first electrode 1 and the first holder 2. Optionally, the first end of the first electrode 1 is provided with a first sealing groove 51. The first sealing groove 51 is close to the threaded connection between the first end of the first electrode 1 and the support sleeve 2, and a first sealing ring is arranged in the first sealing groove 51. The first seal ring installed in the first seal groove 51 on the first electrode 1 prevents the passage of the cooling medium or working gas from the installation surface between the support sleeve 2 and the first electrode 1.

As shown in fig. 1, a second seal groove 52 is provided between the first electrode 1 and the support sleeve 2. Optionally, the support sleeve 2 is provided with a second sealing groove 52. The second sealing groove 52 is close to the threaded connection between the first electrode 1 and the support sleeve 2, and a second sealing ring is arranged in the second sealing groove 52. The second seal ring installed in the second seal groove 52 on the support sleeve 2 prevents the cooling medium from passing through the mounting surface between the first electrode 1 and the support sleeve 2.

As shown in fig. 1 and 4, a third seal groove 53 is provided between the first electrode 1 and the support sleeve 2. Optionally, the first electrode 1 is provided with a third sealing groove 53. A third sealing ring is arranged in the third sealing groove 53, so that the first electrode 1 and the support sleeve 2 are in sealing connection. A third seal ring fitted in a third seal groove 53 on the first electrode 1 prevents the passage of the cooling medium from the mounting surface between the first electrode 1 and the support sleeve 2.

As shown in fig. 1 and 4, the first electrode 1 has a first thread 12 on the outer circumference of the first end, the support sleeve 2 has a second thread on the inner wall of the second end, and the first thread 12 and the second thread are engaged when the first electrode 1 and the support sleeve 2 are assembled. The thread section of the first thread 12 matched with the second thread is positioned between the second sealing ring and the third sealing ring.

As shown in fig. 1 and 4, the arc path 11 includes a first path, a second path, and a third path sequentially arranged in the arc flow direction. The radial dimension of the first passage is tapered in the direction of arc flow. The radial dimension of the second passage is uniform in the arc flow direction. The radial dimension of the third passage increases gradually in the arc flow direction. In some embodiments, the first electrode 1 is provided with a snap-fit for disassembly 4.

The first electrode 1 is used for providing arc-stabilizing working medium gas and a cooling circulation loop required by the plasma generator and power electric transmission required by the plasma generator, so that the normal work of the plasma generator is ensured.

Optionally, the wall thickness of the first electrode 1 is 10mm to 50mm, the length L is 200mm to 600mm, and the inner diameter of the arc channel 11 is 10mm to 60 mm.

In some embodiments, the first electrode 1 is energized positive and the second electrode 3 is energized negative. Alternatively, the first electrode 1 is connected to the negative electrode of the power supply, and the second electrode 3 is connected to the positive electrode of the power supply.

In some embodiments, the cooling medium comprises water or other coolant.

The embodiment of the disclosure is used for improving the comprehensive performance of the arc plasma generator and realizing the light structure of the arc plasma generator.

In some embodiments, the plasma generator operates as follows.

The first electrode 1 and the second electrode 3 are respectively connected with the positive electrode and the negative electrode of a power supply, or the negative electrode and the positive electrode, the first insulating part 91 forms an insulating layer, working medium gas sequentially passes through a channel between the insulating layer and the second electrode 3, the second drainage device 82 and the overlapping section of the second electrode 3 and the first electrode 1 are subjected to voltage breakdown through the overlapping section of the first electrode 1 and the second electrode 3 to start arcing, plasma electric arcs reach the electric arc channel 11 of the first electrode 1 to form rotary arc-stabilizing working medium gas with a certain rotating speed, constant pressure and uniformity, and the rotary arc-stabilizing working medium gas rotates in the electric arc channel 11.

The arc channel 11 forms a stable arc channel for gas discharge, and the stable arc channel can stabilize plasma arcs generated by the plasma generator in the center of the plasma generator, so that the normal work of the arc plasma generator is ensured.

The cooling medium entering the plasma generator firstly flows through the sleeve inflow channel 21, then flows through the electrode inflow channel 63 and the first electrode cooling channel 61 to take away the heat productivity of the first electrode 1, then flows through the second electrode cooling channel 62 and the electrode outflow channel 64, finally flows through the sleeve outflow channel 22 and flows through the whole cooling channel, so that the temperature of the first electrode 1 of the arc plasma generator is not too high, and the normal work of the arc plasma generator is ensured.

Finally, it should be noted that: the above examples are intended only to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the disclosure or equivalent replacements of parts of the technical features may be made, which are all covered by the technical solution claimed by the disclosure.

Claims

1. A plasma generator having a cooling flow passage through which a cooling medium flows, comprising:

the cooling device comprises a first electrode (1) which is of a cylindrical structure, wherein an arc channel (11) arranged along the axial direction of the first electrode (1) is formed in the hollow part of the first electrode (1), and the cooling flow channel comprises an electrode cooling flow channel arranged in the cylinder wall of the first electrode (1);

a support sleeve (2) coaxially arranged at the first axial end of the first electrode (1) and in threaded connection with the first axial end of the first electrode (1), a sleeve cavity of the support sleeve (2) being in communication with the arc channel (11), the cooling flow channel comprising a sleeve inflow channel (21) and a sleeve outflow channel (22) arranged inside the cylinder wall of the support sleeve (2), the sleeve inflow channel (21) and the sleeve outflow channel (22) being in communication with the electrode cooling flow channel; and

a second electrode (3) disposed within the sleeve cavity coaxially with the support sleeve (2).

2. The plasma generator according to claim 1, characterized in that there is a non-contact overlap between the end of the second electrode (3) close to the axial direction of the first electrode (1) and the first end of the first electrode (1).

3. The plasma generator of claim 1, wherein the electrode cooling flow channel comprises:

a first electrode cooling flow passage (61) communicating with the sleeve inflow passage (21); and

a second electrode cooling flow passage (62) located downstream of the first electrode cooling flow passage (61) in a flow direction of the cooling medium and communicating with the sleeve outflow passage (22), the first electrode cooling flow passage (61) being located radially inward of the second electrode cooling flow passage (62).

4. The plasma generator according to claim 3, characterized in that the first electrode cooling channel (61) is separated from the second electrode cooling channel (62) by a spacer (6).

5. The plasma generator of claim 3, wherein the cooling flow channel comprises:

an electrode inflow channel (63) provided at a first end of the first electrode (1), the first electrode cooling flow channel (61) communicating with the sleeve inflow channel (21) through the electrode inflow channel (63); and/or

An electrode outflow channel (64) disposed at a first end of the first electrode (1), the second electrode cooling flow channel (62) communicating with the sleeve outflow channel (22) through the electrode outflow channel (64).

6. The plasma generator of claim 1, comprising:

the first flow guide device (81) is arranged in the cooling flow channel, and is configured to provide flowing power of a cooling medium; and/or

The second drainage device (82) is arranged between the second electrode (3) and the support sleeve (2), and is configured to provide flowing power of working medium gas.

7. The plasma generator according to claim 1, further comprising an insulator (91), the insulator (91) being arranged between the second electrode (3) and the support sleeve (2).

8. The plasma generator of claim 1,

an electrode positioning step (15) is arranged at the first end of the first electrode (1);

one end of the support sleeve (2) connected with the first electrode (1) is provided with a sleeve positioning step, and the electrode positioning step (15) is abutted against the end face of the sleeve positioning step and/or is matched with the circumferential face of the sleeve positioning step.

9. The plasma generator of claim 1,

a first sealing groove (51) is arranged between the first electrode (1) and the supporting sleeve (2), a first sealing ring is arranged in the first sealing groove (51), and the first sealing ring is positioned between the sleeve cavity and the sleeve inflow channel (21) along the radial direction of the supporting sleeve (2); and/or

A second sealing groove (52) is formed between the first electrode (1) and the supporting sleeve (2), a second sealing ring is arranged in the second sealing groove (52), and the second sealing ring is located on the outer side of the sleeve outflow channel (22) along the radial direction of the supporting sleeve (2); and/or

A third sealing groove (53) is formed between the first electrode (1) and the supporting sleeve (2), a third sealing ring is arranged in the third sealing groove (53), and the third sealing ring is located between the sleeve inflow channel (21) and the sleeve outflow channel (22) along the radial direction of the supporting sleeve (2).

10. The plasma generator according to claim 1, characterized in that the first electrode (1) is provided on its periphery with a snap-fit engagement (4) for engaging with a tool when the first electrode (1) is removed from the support sleeve (2).