CN210287470U - Supersonic plasma spraying spray pipe capable of adjusting inner powder feeding position - Google Patents
Supersonic plasma spraying spray pipe capable of adjusting inner powder feeding position Download PDFInfo
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- CN210287470U CN210287470U CN201920979800.0U CN201920979800U CN210287470U CN 210287470 U CN210287470 U CN 210287470U CN 201920979800 U CN201920979800 U CN 201920979800U CN 210287470 U CN210287470 U CN 210287470U
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Abstract
The utility model discloses a supersonic speed plasma spraying spray tube of powder position is sent in adjustable, include: the device comprises a front end baffle, a main spray pipe, a powder hole plugging cap and a cooling water adapter; the front end baffle, the main spray pipe and the cooling water adapter are coaxially matched and arranged from left to right in sequence; the whole main nozzle is of a columnar structure, the center of the main nozzle is of a structure which is contracted firstly and then expanded, the main nozzle is provided with circular through holes distributed along the circumferential direction along the radial direction, the main nozzle is divided into an inner layer and an outer layer, a radial circular hole-shaped powder feeding channel is arranged in the middle area of the two circular through holes, and the powder feeding channels are distributed at equal intervals in the area corresponding to the expansion section along the axial direction. The utility model provides the high suitability of spray tube to different types of powder, this spray tube is applicable to supersonic speed flame spraying equally.
Description
Technical Field
The utility model belongs to the hot spraying field relates to a supersonic speed plasma spraying spray tube.
Background
Plasma spraying is a method of forming a firmly attached surface layer by heating a powder material such as ceramics, alloys, metals, etc. to a molten or semi-molten state using a high-temperature plasma jet generated by a plasma generator as a heat source and spraying the material onto the surface of a pretreated workpiece at a high speed.
Plasma spraying can be divided into subsonic plasma spraying and supersonic plasma spraying according to the velocity of the spraying gas. Compared with the prior art, the supersonic plasma spraying gas velocity is faster, the spraying particles are carried to reach higher velocity, the obtained coating has high tissue density, high interface bonding strength and excellent coating performance, so the supersonic plasma spraying technology is increasingly becoming one of the key development directions of the thermal spraying technology.
Under the supersonic speed condition, the air flow speed is high, the rigidity is strong, if a traditional powder feeding mode is adopted, firstly, the heating stroke of the powder is short, the energy of a plasma flame flow high-temperature area cannot be utilized, the powder is not fully melted, secondly, the powder is difficult to rush into a jet flow core area, the energy of the plasma flame flow core area cannot be fully utilized, the problems of non-uniform powder melting and low melting efficiency and deposition efficiency are caused, and therefore, an internal powder feeding mode is often adopted in supersonic plasma spraying, namely, the sprayed powder is blown into a plasma torch vertically or at a certain angle in a spraying pipe, and the full melting and acceleration of the powder are realized. The jet pipe is a necessary component for generating supersonic airflow, plays a role in accelerating the airflow to achieve supersonic velocity, and is of a contraction-expansion type channel structure.
However, when an internal powder feeding mode is adopted, high requirements are required for the powder feeding position and the powder melting degree, the powder is easily heated insufficiently at the downstream of the internal powder feeding position, the internal powder feeding effect is not obvious, excessive powder melting is easily caused at the upstream, the melted powder is easily deposited on the inner wall of the spray pipe and even the spray pipe is blocked, and meanwhile, different requirements are required for the internal powder feeding position due to different characteristics such as melting points and heat exchange rates of different types of powder. At present traditional interior powder feeding spray tube send powder at fixed position basically, and is narrower to the adaptability of powder, when using different powder in send powder, is difficult to guarantee that the powder is heated to melt fully and can not bond and lead to the dual effect of blocking the spray tube at the spray tube inner wall, often is that the powder characteristic difference needs carry out corresponding supporting the change to the spray tube when great.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the supersonic plasma spraying nozzle overcomes the defects of the prior art, the applicability of the nozzle to different kinds of powder is improved, and the nozzle is also suitable for supersonic flame spraying.
The utility model adopts the technical proposal that: a supersonic plasma spraying nozzle capable of adjusting the position of internal powder feeding comprises a front end baffle, a main nozzle, a powder hole plugging cap and a cooling water adapter; the main nozzle is of a columnar structure, a central hole is formed along the axis, the central hole is of a structure which is contracted and then expanded, the central hole is a high-temperature airflow channel, and the turning point is a nozzle throat; the inner circle of circular through holes and the outer circle of circular through holes are circumferentially distributed around the center hole of the main spray pipe, the number and the distribution angle of the two circles of circular through holes are the same, and the circular through holes are spray pipe cooling water channels; from the longitudinal section of the main nozzle, a radial circular hole-shaped powder feeding channel is arranged in the middle area of the two circular through holes, and the powder feeding channels are distributed at equal intervals in the area corresponding to the expansion section of the high-temperature airflow channel along the axial direction of the main nozzle; the powder hole blocking caps are respectively arranged on the ports of the powder feeding channels; the front end baffle, the main spray pipe and the cooling water adapter are sequentially and coaxially installed from left to right in a matching manner.
One end of the main nozzle is provided with an annular groove around the central shaft, the center of the other end of the main nozzle protrudes outwards, and an inner hole corresponding to the protruding part is a contraction section of the high-temperature airflow channel.
The port of each powder feeding channel is provided with a 55-degree sealed inner conical thread section.
The front end baffle is of an annular sheet structure, and a space area formed after the front end baffle is matched and installed with the annular groove at one end of the main nozzle is a cooling water loop; the front end baffle and the main spray pipe are fixed through a fixed connection screw.
The powder hole plugging cap is a plug processed with a 55-degree sealing outer cone thread section, and the thread specification is the same as the specification of an inner cone thread at the port of the powder feeding channel.
The cooling water adapter is of a revolving body structure, a central step through hole is formed along the axis, a cooling water inlet channel is formed along the radial direction and communicated with the inner wall of the large end of the central step through hole, an annular groove is formed on the end face of one end of the cooling water adapter around the central step through hole, and a cooling water outlet channel along the radial direction of the cooling water adapter is communicated with the annular groove.
The areas of the inner layer circular through hole and the outer layer circular through hole in the two layers of circular through holes of the main nozzle are A1 and A2 respectively, and the area ratio A1/A2 is 0.3-0.7.
The number of the powder feeding channels is 2-5, and the distance between the axis of the powder feeding channel closest to the end face of the main nozzle installation front end baffle and the end face of the main nozzle installation front end baffle is more than or equal to 10 mm.
The diameter of the powder feeding channel is 1-3 mm.
The axis of the powder feeding channel on the longitudinal section of the main nozzle is inclined, and the radial inclination angle gamma is 0-10 degrees.
Compared with the prior art, the utility model the advantage lie in:
(1) the utility model discloses arrange a plurality of interior powder feeding channels at main nozzle expansion section, can select reasonable powder feeding position according to different types of powder and physical properties, realize that the powder is fully heated and is melted and the dual effect of unblock spray tube, strengthened the suitability of single spray tube.
(2) The utility model discloses the circular through-hole type cooling water course that the main spray tube adopted circumference to arrange has satisfied the required space of interior powder feeding passageway in monolithic structure, has guaranteed that the cooling of spray tube is even, abundant simultaneously, has improved the life and the reliability of spray tube.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
fig. 2 is a sectional view taken along the line a-a of fig. 1.
Reference numbers in the figures: 1-front end baffle; 2-fixing the screw; 3-main nozzle; 4-powder hole blocking cap; 5-Cooling Water fittings.
Detailed Description
The following provides a further detailed description of the present invention with reference to the accompanying drawings.
As shown in fig. 1, the supersonic plasma spraying nozzle capable of adjusting the internal powder feeding position of the present invention comprises a front end baffle 1, a fastening screw 2, a main nozzle 3, a powder hole plugging cap 4 and a cooling water adapter 5; the front end baffle 1, the main spray pipe 3 and the cooling water adapter 5 are coaxially matched and arranged from left to right in sequence.
As shown in fig. 1 and 2, the main nozzle 3 has a cylindrical structure as a whole, a structure with a center of contraction before expansion, a high-temperature airflow channel, and a turning point of a nozzle throat; the high-temperature airflow channel is circumferentially distributed with circular through holes 31 along the radial direction of the main nozzle, the number and the distribution angle of the circular through holes 31 in the two layers are the same, the circular through holes 31 are nozzle cooling water channels, the areas of the circular through holes in the inner layer and the circular through holes in the outer layer are respectively A1 and A2, and the area ratio A1/A2 is 0.3-0.7; from the longitudinal section angle of the main nozzle 3, the radial circular hole-shaped powder feeding channels are arranged in the middle area of the two circular through holes 31, the number of the powder feeding channels is 2-5, and the distance between the axis of the powder feeding channel closest to the end surface of the main nozzle 3 provided with the front end baffle 1 and the end surface of the main nozzle 3 provided with the front end baffle 1 is more than or equal to 10 mm.
The diameter of the powder feeding channel is 1-3 mm, the axis of the powder feeding channel is inclined, the radial inclination angle gamma is 0-10 degrees, the outer end of the powder feeding channel is a 55-degree sealed inner conical thread section, and the powder feeding channel is distributed in an area corresponding to the inner expansion section along the axial direction of the main nozzle 3 at equal intervals.
One end of the main nozzle 3 is provided with an annular groove around the central shaft, the center of the other end of the main nozzle protrudes outwards, and the inner hole of the protruding part is a contraction section of a high-temperature airflow channel. The front end baffle 1 is of an annular sheet structure, and a space area formed after the front end baffle 1 is matched with the main spray pipe 3 is a cooling water loop.
The powder hole plugging cap 4 is a plug processed with a 55-degree sealing outer cone thread section, and the thread specification is the same as the specification of an inner cone thread at the outer end of the powder feeding channel.
The cooling water adapter 5 is a revolving body structure, a central step through hole is formed along the axis, a cooling water inlet channel is formed along the radial direction and communicated with the inner wall of the large end of the central step through hole, an annular groove is formed on the end face of one end of the cooling water adapter 5 around the central step through hole, and a cooling water outlet channel along the radial direction of the cooling water adapter 5 is communicated with the annular groove. The convex part at the other end of the main nozzle 3 is inserted into a central step through hole of the cooling water adapter 5, and the center of the cooling water adapter 5 and two layers of annular structures close to the outside are respectively a water inlet uniform distribution ring and a water return water collection ring.
The utility model is also suitable for supersonic flame spraying.
The utility model discloses a theory of operation is: the high-temperature plasma airflow generated by the upstream plasma generator enters the contraction section of the main nozzle 3 from the right side, the airflow is compressed, the speed is increased, the speed reaches the sonic speed at the throat, and the airflow continues to accelerate to reach the supersonic speed as the airflow enters the expansion section and continuously moves forwards. According to the physical characteristics of the type, heat absorption rate, melting point and the like of powder used for spraying, a proper powder feeding channel is selected to spray the powder into high-temperature supersonic plasma airflow at the expansion section of the main nozzle 3, so that the powder is fully and uniformly heated and melted and is sprayed out from the outlet at the left side of the nozzle at a high speed, meanwhile, the melted powder is prevented from being bonded and blocked at the expansion section of the main nozzle 3, the rest powder feeding channels are blocked by the powder hole blocking caps 4, 55-degree conical threads are adopted between the powder hole blocking caps 4 and the powder feeding channels, and the dual functions of connection and sealing are achieved. The circulating cooling water uniformly passes through the through hole type cooling water channel of the main nozzle 3 after passing through the cooling water adapter 5 to effectively cool the circulating cooling water, and is prevented from being burnt by high-temperature plasma airflow.
The technology not described in detail in the specification of the present invention belongs to the common general knowledge of the skilled person in the art.
Claims (10)
1. A supersonic plasma spraying nozzle capable of adjusting the position of internal powder feeding is characterized by comprising a front end baffle (1), a main nozzle (3), a powder hole plugging cap (4) and a cooling water adapter (5); the main nozzle (3) is of a columnar structure, a central hole is formed along the axis, the central hole is of a structure which is contracted and then expanded, the central hole is a high-temperature airflow channel, and the turning point is a nozzle throat; an inner circle of circular through holes (31) and an outer circle of circular through holes (31) are circumferentially distributed around the central hole of the main spray pipe (3), the number and the distribution angle of the two circles of circular through holes (31) are the same, and the circular through holes (31) are spray pipe cooling water channels; from the longitudinal section angle of the main nozzle (3), a radial circular hole-shaped powder feeding channel is arranged in the middle area of the two circular through holes (31), and the powder feeding channels are distributed at equal intervals in the area corresponding to the expansion section of the high-temperature airflow channel along the axial direction of the main nozzle (3); the powder hole blocking caps (4) are respectively arranged on the ports of the powder feeding channels; the front end baffle (1), the main spray pipe (3) and the cooling water adapter (5) are sequentially and coaxially installed from left to right in a matching manner.
2. The supersonic plasma spray nozzle of claim 1, having an adjustable internal powder feed position, wherein: one end of the main nozzle (3) is provided with an annular groove around the central shaft, the center of the other end of the main nozzle protrudes outwards, and an inner hole corresponding to the protruding part is a contraction section of the high-temperature airflow channel.
3. The supersonic plasma spray nozzle of claim 2, with an adjustable internal powder feed position, further comprising: the port of each powder feeding channel is provided with a 55-degree sealed inner conical thread section.
4. The supersonic plasma spray nozzle of claim 2, with an adjustable internal powder feed position, further comprising: the front end baffle (1) is of an annular sheet structure, and a space area formed after the front end baffle is matched and installed with an annular groove at one end of the main spray pipe (3) is a cooling water loop; the front end baffle (1) and the main spray pipe (3) are fixed through a fixed connection screw (2).
5. A supersonic plasma spray nozzle of adjustable internal powder feed position according to claim 3, wherein: the powder hole plugging cap (4) is a plug processed with a 55-degree sealing outer cone thread section, and the thread specification is the same as the specification of an inner cone thread at the port of the powder feeding channel.
6. The supersonic plasma spray nozzle of claim 1, having an adjustable internal powder feed position, wherein: the cooling water adapter (5) is of a revolving body structure, a central step through hole is formed along the axis, a cooling water inlet channel is formed along the radial direction and communicated with the inner wall of the large end of the central step through hole, an annular groove is formed on the end face of one end of the cooling water adapter (5) around the central step through hole, and a cooling water outlet channel along the radial direction of the cooling water adapter (5) is communicated with the annular groove.
7. The supersonic plasma spray nozzle of claim 1, having an adjustable internal powder feed position, wherein: the areas of the inner layer circular through hole and the outer layer circular through hole in the two layers of circular through holes of the main nozzle (3) are A1 and A2 respectively, and the area ratio A1/A2 is 0.3-0.7.
8. The supersonic plasma spray nozzle of claim 7, having an adjustable internal powder feed position, wherein: the number of the powder feeding channels is 2-5, and the distance between the axis of the powder feeding channel closest to the end face of the main spray pipe (3) provided with the front end baffle (1) and the end face of the main spray pipe (3) provided with the front end baffle (1) is more than or equal to 10 mm.
9. The supersonic plasma spray nozzle of claim 8, with an adjustable internal powder feed position, further comprising: the diameter of the powder feeding channel is 1-3 mm.
10. The supersonic plasma spray nozzle of claim 9 with adjustable internal powder feed position, wherein: the axis of the powder feeding channel on the longitudinal section of the main nozzle (3) is inclined, and the radial inclination angle gamma is 0-10 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920979800.0U CN210287470U (en) | 2019-06-26 | 2019-06-26 | Supersonic plasma spraying spray pipe capable of adjusting inner powder feeding position |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920979800.0U CN210287470U (en) | 2019-06-26 | 2019-06-26 | Supersonic plasma spraying spray pipe capable of adjusting inner powder feeding position |
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| CN210287470U true CN210287470U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920979800.0U Active CN210287470U (en) | 2019-06-26 | 2019-06-26 | Supersonic plasma spraying spray pipe capable of adjusting inner powder feeding position |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505864A (en) * | 2022-08-08 | 2022-12-23 | 中国人民解放军陆军装甲兵学院 | Small-size axial powder feeding inner hole plasma spraying gun |
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2019
- 2019-06-26 CN CN201920979800.0U patent/CN210287470U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115505864A (en) * | 2022-08-08 | 2022-12-23 | 中国人民解放军陆军装甲兵学院 | Small-size axial powder feeding inner hole plasma spraying gun |
| CN115505864B (en) * | 2022-08-08 | 2023-12-29 | 中国人民解放军陆军装甲兵学院 | Small-size axial powder feeding inner hole plasma spraying gun |
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