CN2413467Y - Plasma generator for spraying process - Google Patents
Plasma generator for spraying process Download PDFInfo
- Publication number
- CN2413467Y CN2413467Y CN 99244261 CN99244261U CN2413467Y CN 2413467 Y CN2413467 Y CN 2413467Y CN 99244261 CN99244261 CN 99244261 CN 99244261 U CN99244261 U CN 99244261U CN 2413467 Y CN2413467 Y CN 2413467Y
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- China
- Prior art keywords
- anode
- section
- negative electrode
- inner chamber
- diameter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000005507 spraying Methods 0.000 title claims description 12
- 238000000034 method Methods 0.000 title description 4
- 238000000576 coating method Methods 0.000 claims abstract description 13
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000007750 plasma spraying Methods 0.000 abstract description 3
- 230000007704 transition Effects 0.000 abstract 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- Plasma Technology (AREA)
- Nozzles (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The utility model relates to a plasma spraying technology especially relates to a plasma generator who is used for this technology. The inner cavity of the anode of the device is composed of a rectifying section, a transition section, a compression section and an expansion section along the airflow direction, wherein except that the inner cavity of the rectifying section is a circular truncated cone, other inner cavities are all cylinders, the diameter of the transition section is the same as that of the top circle of the rectifying section, the ratio of the diameter of the compression section to that of the transition section is 1: 1.5-1: 2.5, the ratio of the diameter of the compression section to that of the expansion section is 1: 1.5-1: 3.5, and the expansion section is used as a nozzle. Compared with the existing equipment, the device has the advantages of low noise, improved working environment quality and improved coating quality.
Description
The utility model relates to plasma spray coating process, relates in particular to a kind of plasma generator that is used for this technology.Plasma spray coating process is powder heating, the acceleration that will spray with plasma jet, is ejected into a kind of technology on the workpiece then.The negative electrode of the used plasma generator of existing plasma spray coating process is the electrode stem that a head has cone, anode then has a flaring inner chamber, the cone of negative electrode reaches in the inner chamber of anode, and working gas enters the inner chamber from the side of negative electrode, after the making current, working gas is ionized, only there is a very short laminar flow in formed plasma jet, just becomes turbulent flow then, produces a lot of vortexs, make the heat heavy losses, during spraying also with high-intensity noise.After such plasma generator was used for spraying coating process, the noise of generation was very big, and operational environment is very poor, also seriously had influence on the quality of coating.
The purpose of this utility model is exactly the internal structure by the improvement plasma generator, makes this plasma generator can obtain stable laminar flow plasma jet, thereby reduces the noise and the energy loss of plasma spraying, improves operational environment, improves coating quality.
For achieving the above object, the technical solution adopted in the utility model is: plasma generator is by the negative electrode of double as delivery port, the anode of double as nozzle, the circuit that links to each other with anode with negative electrode, front gun body, rear lance, water inlet pipe, air inlet pipe is formed, the front portion of negative electrode is a cone, the rear portion then is the interior empty Metallic rod of double as delivery port, anode has inner chamber, form a cavity between anode external and the front gun body, one end of this cavity links to each other with water inlet, the other end is communicated to the exhalant canal of cathode rod, rear lance is made by insulating material, the circular cone of negative electrode is positioned in the rear lance with the bar portion of combining, the nose cone part then places the anode inner chamber, it is characterized in that: the inner chamber of anode along airflow direction by rectification section, changeover portion, the compression section, expansion segment four parts are formed, wherein except the rectification section inner chamber is Rotary-table, other inner chambers are cylinder, the diameter of changeover portion is identical with rectification section round platform outside diameter circle, compression section diameter and changeover portion diameter ratio are 1: 1.5～1: 2.5, compression section diameter and expansion segment diameter ratio are 1: 1.5～1: 3.5, and expansion segment is as nozzle.
For the ease of the formation of laminar flow, place a guide ring at the nose cone of negative electrode and the bar portion of combining, have 15～40 apertures on the guide ring equably, working gas enters rectification section by air inlet pipe from the aperture of guide ring.
After adopting the technical solution of the utility model, can form stable laminar flow plasma jet, thereby reduce the noise and the energy loss of plasma spraying, improve operational environment, improve coating quality.Spraying with the WC/Co coating is an example, with the performance data such as the table 1 of scheme of the present utility model and two kinds of technologies sprayings of common turbulent flow gained.
The performance comparison of table 1 scheme of the present utility model and common turbulent flow technology spraying WC coating
| Technology | Porosity % | WC content % | Microhardness HV300 | Average bonding strength MPa | Power kW | Noise dB |
| The art of this patent | 4．3 | 45 | 1113．5 | 64．5 | 14～16 | 75 |
| Former turbulent flow | 4．75 | 43．2 | 890 | 46．5 | ～20 | 120 |
Data show in the table, and the performance of the utility model laminar flow spray-on coating is better than former turbulent flow coating, and noise all has decline significantly with power.
The utility model is further described below in conjunction with accompanying drawing.
Fig. 1 turbulent jet (a) and the disturbance contrast of laminar jet (b) to atmosphere;
Fig. 2 laminar flow plasma generator schematic diagram.
In Fig. 1, turbulent jet is very fast formation turbulent flow behind very short stable jet of experience, and the laminar jet that the utility model patented technology is produced has a very long stable jet.
In the embodiment shown in Figure 2, a kind of plasma generator that is used for spraying coating process, negative electrode 4 by the double as delivery port, the anode 1 of double as nozzle, front gun body 3, rear lance 6, water inlet pipe 12, air inlet pipe 10 is formed, the front portion of negative electrode is a cone, the rear portion then is the interior empty Metallic rod 7 of double as delivery port, anode 1 places front gun body 3 and fixing with cover cap 2, cover cap 2 has centre bore, nozzle passes from this centre bore, anode 1 has inner chamber, form a cavity 14 between anode 1 outside and the front gun body 3, one end of this cavity 14 links to each other with water inlet 12, the other end is communicated to the exhalant canal of cathode rod 7, rear lance 6 is made by insulating material, the circular cone of negative electrode 4 is with in the bar portion of combining is positioned rear lance 6, the nose cone part then places the anode inner chamber, the inner chamber of anode along airflow direction by rectification section 11, changeover portion 13, compression section 15 and expansion segment 16 4 parts are formed in proper order, be the Rotary-table wherein except rectification section inner chamber 11, other inner chambers are cylinder, the diameter of changeover portion 13 is identical with rectification section 11 round platform outside diameter circles, compression section 15 diameters and changeover portion 13 diameter ratios are 1: 2, compression section 15 diameters and expansion segment 16 diameter ratios are 1: 3.4, expansion segment 16 is as nozzle, and the cone of negative electrode 4 puts in rectification section 11 and changeover portion 13.
The as a whole structure of anode 1 each section of inner chamber.A guide ring 5 is placed by the nose cone of negative electrode 4 and the bar portion of combining, and has 24 apertures 9 on the guide ring 5 equably, and working gas enters rectification section 11 by air inlet pipe 10 from the aperture 9 of guide ring 5.With, in order to prevent the seepage of cooling water, be connected with the exhalant canal of cathode rod 7 front gun body 3 of passage and joint portions of rear lance 6 junctions, cathode rod 7 delivery ports and rear lance 6 etc. of the knot seam place, two ends of the cavity 14 that surrounds at anode 1 and front gun body 3, cavity 14 may produce place installation sealing structure all of the seepage of cooling water, and be circumferential sealing, to guarantee the axial installation accuracy of plasma generator.
Now that the data list of two embodiment of this patent is as follows:
| Circular diameter at the bottom of the rectification section | The compression section diameter | The changeover portion diameter | The expansion segment diameter | The little hole count of guide ring | |
| Embodiment 1 | 17mm | 5mm | 10mm | 40mm | 24 |
| |
15mm | 6mm | 12mm | 45mm | 30 |
This device is compared the noise with generation with existing equipment very little, and the quality of working environment quality and coating all is improved.
Claims (4)
1. plasma generator that is used for spraying coating process, negative electrode (4) by the double as delivery port, the anode of double as nozzle (1), the circuit that links to each other with anode with negative electrode, front gun body (3), rear lance (6), water inlet pipe (12), air inlet pipe (10) is formed, the front portion of negative electrode is a cone, the rear portion then is the interior empty Metallic rod of double as delivery port (7), anode (1) has inner chamber, form a cavity (14) between anode (1) outside and the front gun body (3), one end of this cavity links to each other with water inlet (12), the other end is communicated to the exhalant canal of cathode rod (7), rear lance (6) is made by insulating material, the circular cone of negative electrode (4) is with in the bar portion of combining is positioned rear lance (6), the nose cone part then places the anode inner chamber, it is characterized in that: the inner chamber of anode along airflow direction by rectification section (11), changeover portion (13), compression section (15) and expansion segment (16) four parts are formed in proper order, be the Rotary-table wherein except rectification section inner chamber (11), other inner chambers are cylinder, rectification section round platform inner chamber should be able to guarantee that the negative electrode nose cone is placed in one but not contact with the chamber wall, the diameter of changeover portion (13) is identical with rectification section (11) round platform outside diameter circle, compression section (15) diameter and changeover portion (13) diameter ratio are 1: 1.5～1: 2.5, compression section (15) diameter and expansion segment (16) diameter ratio are 1: 1.5～1: 3.5, expansion segment (16) is as nozzle, and the cone of negative electrode (4) puts in anode (1) inner chamber.
2. plasma generator according to claim 1 is characterized in that: the as a whole structure of each section of inner chamber of anode (1).
3. plasma generator according to claim 1 and 2, it is characterized in that: the nose cone of negative electrode (4) is placed a guide ring (5) with the bar portion of combining, have 15～40 apertures (9) on the guide ring (5) equably, working gas enters rectification section (11) by air inlet pipe (10) from the aperture (9) of guide ring (5).
4. plasma generator according to claim 1 and 2 is characterized in that: the circumferential sealing structure is all installed in the knot seam place, two ends of the cavity (14) that surrounds at anode (1) and front gun body (3), cavity (14) place that the front gun body (3) of passage and the joint portion of rear lance (6) junction, cathode rod (7) delivery port and rear lance (6) etc. may produce the seepage of cooling water that is connected with the exhalant canal of cathode rod (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99244261 CN2413467Y (en) | 1999-09-10 | 1999-09-10 | Plasma generator for spraying process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99244261 CN2413467Y (en) | 1999-09-10 | 1999-09-10 | Plasma generator for spraying process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2413467Y true CN2413467Y (en) | 2001-01-03 |
Family
ID=34030389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99244261 Expired - Lifetime CN2413467Y (en) | 1999-09-10 | 1999-09-10 | Plasma generator for spraying process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2413467Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100441501C (en) * | 2002-09-09 | 2008-12-10 | 张芬红 | System for preparing nanometer silicon nitride powder |
| CN102271451A (en) * | 2010-06-03 | 2011-12-07 | 成都阳流科技发展有限公司 | Cathode structure of laminar flow electric arc plasma generator |
| CN101828432B (en) * | 2007-08-06 | 2013-11-06 | 普拉斯马外科投资有限公司 | Pulsed plasma device and method for generating pulsed plasma |
| CN104853514A (en) * | 2015-05-12 | 2015-08-19 | 四川大学 | Laminar plasma generator |
| WO2023015613A1 (en) * | 2021-08-12 | 2023-02-16 | 江苏天楹等离子体科技有限公司 | Device and method for producing metal powder by means of plasma atomization |
-
1999
- 1999-09-10 CN CN 99244261 patent/CN2413467Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100441501C (en) * | 2002-09-09 | 2008-12-10 | 张芬红 | System for preparing nanometer silicon nitride powder |
| CN101828432B (en) * | 2007-08-06 | 2013-11-06 | 普拉斯马外科投资有限公司 | Pulsed plasma device and method for generating pulsed plasma |
| CN102271451A (en) * | 2010-06-03 | 2011-12-07 | 成都阳流科技发展有限公司 | Cathode structure of laminar flow electric arc plasma generator |
| CN102271451B (en) * | 2010-06-03 | 2016-01-06 | 四川金虹等离子技术有限公司 | A kind of cathode construction of laminar flow electric arc plasma generator |
| CN104853514A (en) * | 2015-05-12 | 2015-08-19 | 四川大学 | Laminar plasma generator |
| WO2023015613A1 (en) * | 2021-08-12 | 2023-02-16 | 江苏天楹等离子体科技有限公司 | Device and method for producing metal powder by means of plasma atomization |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |