CN209767899U - Cathode and plasma generator - Google Patents
Cathode and plasma generator Download PDFInfo
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- CN209767899U CN209767899U CN201920326830.1U CN201920326830U CN209767899U CN 209767899 U CN209767899 U CN 209767899U CN 201920326830 U CN201920326830 U CN 201920326830U CN 209767899 U CN209767899 U CN 209767899U
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- pipe section
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- connecting pipe
- working pipe
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- 239000000463 material Substances 0.000 claims abstract description 30
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 5
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 239000004332 silver Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 4
- 229910052726 zirconium Inorganic materials 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 13
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005219 brazing Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Plasma Technology (AREA)
Abstract
The utility model discloses a negative pole and plasma generator relates to the plasma field. The cathode comprises at least one working pipe section and at least one connecting pipe section connected with the working pipe section; the working pipe section is an area where an arc root is located when the plasma generator runs; the working pipe section and the connecting pipe section are made of different materials. The utility model discloses a can improve the negative pole life-span under the circumstances that reduces the negative pole cost.
Description
Technical Field
The utility model relates to a plasma field especially relates to a negative pole and plasma generator.
background
The basic structure of the arc plasma torch is that an anode and a cathode are arranged in a discharge chamber and are respectively connected with the anode and the cathode of a direct current power supply. The high-frequency arc starting device discharges between a cathode and an anode to generate electric arcs, working gas is ionized and heated after passing through the high-temperature electric arcs to form thermal plasma, and then the thermal plasma is ejected from one end of the anode under the driving of pressure to form a plasma torch. The flame of the plasma torch has a high thermal power density and contains a large amount of highly active ions, and thus has a wide application in industrial fields where heating or high temperature treatment is required.
The electrode of the plasma torch is a consumable product, particularly the service life of a cathode, and the research is always focused. The currently used tubular cathode is made of red copper (T2, purity higher than 99.9%), and when the working gas is an oxidizing medium (such as air, oxygen, etc.), the service life of the cathode is usually not longer than 100 hours. In order to prolong the service life of the cathode, most tubular cathode plasma torches continuously adjust the air volume ratio of two paths of inlet air, so that the position of an arc root in the cathode is continuously moved. The continuous movement of the arc root position can prevent the electric arc from being continuously burnt at a certain position, is beneficial to prolonging the service life of the electrode, but frequent air volume adjustment also reduces the operation reliability of the plasma torch, and particularly, the arc breaking fault is more serious under the condition that the carrier air source is unstable. Meanwhile, oxide powder generated during long-term discharge of the cathode also affects the arcing region.
The cathode is made of pure silver or silver-copper alloy, so that the service life of the cathode can be obviously prolonged under the working condition of an oxidizing medium, and the manufacturing cost of the cathode is greatly increased.
Disclosure of Invention
The to-be-solved technical problem of the present invention is to provide a cathode and a plasma generator, which can improve the life of the cathode while reducing the cost of the cathode.
According to an aspect of the present invention, a cathode is provided, which includes: the plasma generator comprises at least one working pipe section, wherein the working pipe section is an area where an arc root is located when the plasma generator runs; and at least one connecting pipe section connected to the working pipe section; wherein, the material of the working pipe section is different from that of the connecting pipe section.
In one embodiment, the work pipe section and the connecting pipe section are detachably connected.
In one embodiment, a seal ring is disposed between the working pipe section and the connecting pipe section.
In one embodiment, the work pipe section is threadably connected to the connection pipe section.
In one embodiment, the work pipe section and the connection pipe section are at least one of welded and interference fit connected.
In one embodiment, the cathode includes at least two work tube segments.
In one embodiment, the work pipe sections and the connecting pipe sections are arranged alternately in the axial direction; or the working pipe section is embedded on the inner side arm of the connecting pipe section.
In one embodiment, the work pipe section is disposed coaxially with the connection pipe section.
In one embodiment, a radial positioning structure is provided between the work pipe section and the connecting pipe section.
In one embodiment, the working pipe section and the connecting pipe section are matched by adopting an annular step structure.
In one embodiment, the working pipe section and the connecting pipe section are made of a material that satisfies at least one of the following: the melting point of the material of the working pipe section is greater than that of the material of the connecting pipe section; the oxidation resistance of the material of the working pipe section is greater than that of the material of the connecting pipe section; the electron emission power of the material of the working pipe section is lower than that of the material of the connecting pipe section.
In one embodiment, the material of the work tube segment comprises silver, silver-copper alloy and/or zirconium; the connecting pipe section is made of red copper.
According to another aspect of the present invention, there is also provided a plasma generator, comprising the cathode described above.
compared with the prior art, the utility model discloses a negative pole is constituteed to the pipeline section of different materials, makes the arc root position continuously move with the continuous adjustment working gas amount of wind and compares, can improve the operational reliability of negative pole, improves the negative pole life-span under reduce cost's the condition.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
The invention will be more clearly understood from the following detailed description, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of an embodiment of the cathode of the present invention.
fig. 2 is a schematic structural view of another embodiment of the cathode of the present invention.
Fig. 3 is a schematic structural view of a cathode according to still another embodiment of the present invention.
Fig. 4 is a schematic structural view of another embodiment of the cathode of the present invention.
Fig. 5 is a schematic structural diagram of an embodiment of the plasma generator of the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, 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 invention.
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.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
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 order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
The utility model provides a negative pole for example is tubular cathode, the both ends of tubular cathode, one end opening, and the other end seals, and the clearance that the distance is very little between the negative and positive poles constitutes main gas port, and the negative pole blind end sets up the aperture and constitutes supplementary air intake. One path of working gas enters the plasma generator through the rotation of the main gas port, and the other path of working gas enters the plasma generator through the rotation of the auxiliary gas inlet.
As shown in fig. 1, the cathode includes at least one work pipe segment 100A and at least one work pipe segment 100A, the work pipe segment 100A is connected to the connection pipe segment 100B, and the work pipe segment 100A and the connection pipe segment 100B are made of different materials.
The work pipe section 100A is used to emit electrons in the region where the arc root is located for operation of the plasma generator, and if there are multiple work pipe sections, the arc root may be transferred from one work pipe section to another. The coupling segment 100B is a non-working region of the arc root and functions to couple the working segments 100A. The connecting pipe section 100B may also have different functions at different positions of the cathode, for example, the connecting pipe section 100B is disposed at the side of the auxiliary air inlet of the cathode, so as to prevent the arc root from moving to the auxiliary air inlet. The coupling segment 100B is disposed at another location on the cathode and functions to transition the arc root to the work segment 100A, e.g., to transfer the arc from the location where the arc is generated to the work segment 100A.
In one embodiment, the melting point of the material of the work pipe section 100A is greater than the melting point of the material of the coupling pipe section 100B, the oxidation resistance of the material of the work pipe section 100A is greater than the oxidation resistance of the material of the coupling pipe section 100B, and the electron emission power of the material of the work pipe section 100A is lower than the electron emission power of the material of the coupling pipe section 100B. That is, the working pipe section 100A is made of precious metal materials with high melting point, high electrical conductivity, high oxidation resistance, low electron emission power, high thermal conductivity and high thermal conductivity, such as silver, silver-copper alloy and zirconium, to improve the cathode and prolong the service life. The connecting tube section 100B is made of a common metal material with high thermal conductivity, good electrical conductivity and low price, such as red copper, so as to reduce the overall cost of the tubular cathode.
In the above-mentioned embodiment, adopt the pipeline section constitution negative pole of different materials, make the arc root position with the continuous regulation working gas amount of wind and compare that the operational reliability of negative pole is higher, and the negative pole life-span is longer.
In one embodiment, the work pipe segments 100A may be disposed at the cathode end and may also be disposed between the connection pipe segments 100B, and if there are a plurality of work pipe segments 100A and a plurality of connection pipe segments 100B, the work pipe segments 100A and the connection pipe segments 100B may be axially alternated. The arc root is stabilized on a certain working pipe section 100A when the plasma generator operates normally, and is transferred between different working pipe sections 100A, for example, after the plasma generator operates for a specific period, the arc root is transferred from one working pipe section to another working pipe section, so that the service life of the cathode is prolonged. The position of the arc root of the arc can be moved by adjusting the flow of the main gas and the flow of the auxiliary gas or setting the current, so that the arc root can be moved between different working pipe sections.
In another embodiment, the working pipe section 100A may also be nested on the inside arm of the connecting pipe section 100B.
in one embodiment, the work pipe segment 100A and the connection pipe segment 100B may be detachably connected, such as by screwing, welding, interference fit, etc.
Fig. 2 is a schematic structural view of another embodiment of the cathode of the present invention. The structure is a longitudinal sectional view of the cathode. In this embodiment, the working pipe section 100A and the connection pipe section 100B in the cathode are connected by a thread 110, wherein a sealing ring, such as an O-ring 111, is disposed between the working pipe section 100A and the connection pipe section 100B, and the O-ring 111 can separate the cooling medium 500 from the working gas 400, thereby ensuring the normal operation of the plasma generator. A straight line in the radial direction between the tubes is illustrated as the radial center of the tubes.
during normal operation of the plasma generator, the arc root stabilizes at region M. After the service life of the working pipe section 100A is reached, only the material of the working pipe section needs to be replaced, so that the maintenance cost of the electrode is reduced.
Fig. 3 is a schematic structural view of a cathode according to still another embodiment of the present invention. In this embodiment, the working pipe section and the connecting pipe section in the cathode are connected by welding, such as high-frequency brazing, vacuum brazing, friction welding, and the like.
This embodiment includes two work pipe sections 100A-1 and 100A-2 and three connecting pipe sections 100B, with the work pipe sections located between the connecting pipe sections. Because the welding mode is fixed connection, after the working pipe section is burnt out, a new device needs to be replaced, and therefore two or more working pipe sections can be arranged in the cathode. Wherein a balance point can be found between the number of configuration of the work pipe sections and the service life of the cathode, depending on the customer acceptance.
During normal operation of the plasma generator, the arc root settles on M1 in the work pipe section 100A-1 and is then free to transfer to M2 in the work pipe section 100A-2 as required by the program. Through this cathode structure, can promote the life of negative pole.
Fig. 4 is a schematic structural view of another embodiment of the cathode of the present invention. In this embodiment, the working segments 100A-1, 100A-2 and the connecting segment 100B in the cathode are connected by interference fit 130. Because the interference fit mode is fixed connection, after the working pipe section is burnt out, a new device needs to be replaced, and therefore two or more working pipe sections can be configured in the cathode. The work pipe sections 100A-1, 100A-2 in this embodiment are nested on the inside arms of the connecting pipe section 100B.
During normal operation of the plasma generator, the arc root is stabilized at M1 in the work pipe section 100A-1 and then can be freely transferred to M2 in the work pipe section 100A-2 according to program requirements. Through this cathode structure, can promote the life of negative pole.
In one embodiment, the work pipe section 100A and the connection pipe section 100B are coaxially arranged, and in order to ensure the coaxiality of the work pipe section 100A and the connection pipe section 100B, a radial positioning structure may be arranged between the work pipe section 100A and the connection pipe section 100B, for example, an annular step structure fit is adopted between the work pipe section 100A and the connection pipe section 100B.
As shown in fig. 3, the concentricity between the work pipe segment 100A and the connection pipe segment 100B is ensured by the arrangement of the boss 126. In one embodiment, work pipe section 100A is flush with the inside wall of connecting pipe section 100B.
fig. 5 is a schematic structural diagram of an embodiment of the plasma generator of the present invention. In this embodiment, the working pipe section 100A is located at one end of the cathode, and the other end is provided with a connecting pipe section 100B, wherein the coaxiality between the working pipe section 100A and the connecting pipe section 100B is ensured by arranging bosses. The working pipe section 100A is made of a silver pipe, a silver-copper alloy pipe or a zirconium pipe, and the connecting pipe section 100B is made of a red copper pipe. One path of the working gas 400 enters from the main air inlet between the anode 200 and the cathode 100, and the other path enters from the auxiliary air inlet of the cathode.
In this embodiment, a long connecting pipe section 100B is provided between the cathode auxiliary air inlet and the working pipe section 100A, and the cost of the cathode is reduced because the connecting pipe section 100B is made of inexpensive metal.
Because the working pipe section 100A is arranged at the cathode arcing part, the high-frequency arcing success rate of the plasma generator can be obviously improved, the working pipe section is directly contacted with a cooling medium, the cooling effect is better, the problem that the traditional cathode cannot be used due to serious burning loss of an arcing surface after multiple times of arcing is avoided, and the service life of the cathode is prolonged. In addition, the arc root position is discontinuously moved when the plasma generator operates, so that the operation stability of the generator is improved. Moreover, only the working pipe section adopts noble metal, so that the overall cost of the generator is reduced.
The present invention has been described in detail so far. Some details which are well known in the art have not been described in order to avoid obscuring the concepts of the present invention. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present invention have been described in detail by way of illustration, it should be understood by those skilled in the art that the above illustration is only for purposes of illustration and is not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (13)
1. A cathode, comprising:
The plasma generator comprises at least one working pipe section, wherein the working pipe section is an area where an arc root is located when the plasma generator runs; and
At least one connecting pipe section connected to the working pipe section;
Wherein the working pipe section and the connecting pipe section are made of different materials.
2. The cathode according to claim 1,
The working pipe section and the connecting pipe section adopt a detachable connection mode.
3. The cathode according to claim 2,
And a sealing ring is arranged between the working pipe section and the connecting pipe section.
4. The cathode according to claim 2,
the working pipe section is in threaded connection with the connecting pipe section.
5. The cathode according to claim 1,
The working pipe section and the connecting pipe section are connected in at least one of welding and interference fit.
6. The cathode according to claim 5,
The cathode includes at least two work tube segments.
7. The cathode according to any one of claims 1 to 6,
the working pipe sections and the connecting pipe sections are axially and alternately arranged; or
the working pipe section is embedded on the inner side arm of the connecting pipe section.
8. The cathode according to any one of claims 1 to 6,
The working pipe section and the connecting pipe section are coaxially arranged.
9. the cathode according to claim 8,
And a radial positioning structure is arranged between the working pipe section and the connecting pipe section.
10. The cathode according to claim 9,
The working pipe section is matched with the connecting pipe section in an annular step structure.
11. The cathode according to any one of claims 1 to 6, wherein the material of the working tube section and the connecting tube section satisfies at least one of the following:
The melting point of the material of the working pipe section is greater than that of the material of the connecting pipe section;
The oxidation resistance of the material of the working pipe section is greater than that of the material of the connecting pipe section;
The electron escape power of the material of the working pipe section is lower than that of the material of the connecting pipe section.
12. The cathode according to claim 11,
The material of the working pipe section comprises silver, silver-copper alloy and/or zirconium;
the connecting pipe section is made of red copper.
13. a plasma generator comprising a cathode according to any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920326830.1U CN209767899U (en) | 2019-03-14 | 2019-03-14 | Cathode and plasma generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920326830.1U CN209767899U (en) | 2019-03-14 | 2019-03-14 | Cathode and plasma generator |
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| Publication Number | Publication Date |
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| CN209767899U true CN209767899U (en) | 2019-12-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113084287A (en) * | 2021-04-02 | 2021-07-09 | 星箭精工科技(常州)有限公司 | Non-vacuum brazing method for plasma cutting electrode |
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2019
- 2019-03-14 CN CN201920326830.1U patent/CN209767899U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113084287A (en) * | 2021-04-02 | 2021-07-09 | 星箭精工科技(常州)有限公司 | Non-vacuum brazing method for plasma cutting electrode |
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