CN202877077U - Inner hole cold spraying spray gun - Google Patents
Inner hole cold spraying spray gun Download PDFInfo
- Publication number
- CN202877077U CN202877077U CN201220474378.1U CN201220474378U CN202877077U CN 202877077 U CN202877077 U CN 202877077U CN 201220474378 U CN201220474378 U CN 201220474378U CN 202877077 U CN202877077 U CN 202877077U
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- cold spraying
- spray gun
- air chamber
- powder feeding
- laval nozzle
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Abstract
The utility model relates to an inner hole cold spraying spray gun comprising a powder conveying connector, two working gas inlet connectors, an L-shaped preliminary chamber, a temperature measuring connector, a pressure measuring connector, a powder conveying pipe and a laval nozzle. The inner hole cold spraying spray gun is characterized by further comprising a middleware; the powder conveying connector is placed at the top end of the L-shaped preliminary chamber; the tail end of the L-shaped preliminary chamber is fixedly connected with the laval nozzle through the middleware; and the powder conveying pipe is connected with the powder conveying connector, is communicated with the laval nozzle through a through hole formed in the L-shaped preliminary chamber, and after turning, a straight part at the tail end of the L-shaped preliminary chamber is fixed. According to the inner hole cold spraying spray gun disclosed by the utility model, a position and a way of powder conveying are changed and the length of a vertical section of the preliminary chamber can be determined according to the actual condition, so that the surface of the inner wall with a small hole diameter can be subjected to cold spraying treatment through using an inner hole cold spraying technology; and a coating is prepared on the inner wall of a workpiece and the repairing and the reproduction of the workpiece can be realized, so that the surface performance of the inner hole wall of the workpiece is improved.
Description
Technical field
The present invention relates to the device of a kind of material surface modifying in the Surface Engineering field, specifically a kind of cold spray technique that utilizes deposits to the inner hole of workpiece surface with the device of preparation coating with powder particle, relates to a kind of endoporus cold spraying spray gun.
Background technology
Cold spraying is to be expanded and next a kind of novel, advanced face coat technology by plasma spray technology.Cold spraying is based on the process of aerodynamics and high velocity impact principle of dynamics, at first gases at high pressure are imported contraction-expanding Laval nozzle, gas flow produces Supersonic Flow after crossing nozzle throat, then by powder feeding gas dusty spray is sent into the air-flow from nozzle upstream vertically, powder particle is accelerated to above high-speed of 300～1200m/s through whole nozzle, violent plastic deformation occurs and deposits the formation coating with the matrix collision in formation high-velocity particles stream.In this course, the common preheating of working gas, different according to sprayed on material, temperature is generally at 100～800 ° of C, but far below the fusing point of sprayed on material.Because spraying process adopts relatively low temperature, the adverse effects such as the oxidation (for metal material) that can avoid in thermal spray process, occuring, phase transformation, decomposition, chemical reaction, grain growth (for nano structural material).At present, cold spray technique successfully has been used to prepare most of simple metal, alloy, metal-base composites, nanostructured metal coating or bulk etc.
As everyone knows, the inner surface of a lot of industrial parts need to protect.For because of wearing and tearing or the endoporus parts that lost efficacy of corrosion, for example the cylinder jacket of engine is the most serious parts that wear and tear, owing to bear high temperature, impacting with high pressure and the straight motion of piston reciprocating friction, wearing and tearing comparatively fast easily produce pull-cylinder phenomena.Therefore, can on the inwall of cylinder sleeve, replace original cast steel cover by spray-on coating, not only can reduce the wearing and tearing of inboard wall of cylinder liner, can also alleviate the weight of engine, prolong the service life of engine.Anticorrosion and wear-resistant coating is a kind of effective means that solves parts corrosion and wearing and tearing at the surface deposition of parts to adopt spraying technology, but when the inner space was narrow, general spraying equipment just was difficult to the preparation of parts internal surface protection coating.Although the part plasma spray technology has solved the problem of endoporus spraying at present, for example: Chinese patent (88213477.9) discloses a kind of endoporus plasma gun that sprays internal diameter 105mm workpiece; United States Patent (USP) (5245153) has been announced a kind of endoporus arc spraying apparatus of consutrode.But inevitably can occur the overheated phenomenon of matrix and spray gun in thermal spray process, therefore, cold spray technique is expected to become a kind of new method for preparing endoporus metal coating or composite coating.But existing cold spraying spray gun can not be at the bore area spray-on coating of small diameter because sprayed the space and stretch in the hole nozzle can not be perpendicular to the restriction of the factors such as inner hole wall.Therefore, a kind of easy, endoporus cold spraying spray gun low cost of manufacture, that relative size is less of exploitation will have engineering significance very much.This can realize that not only the endoporus cold spray technique prepares coating at the inwall of workpiece, can also realize the reparation of workpiece and can make again.
Summary of the invention
The technical problem that solves
For fear of the deficiencies in the prior art part, the present invention proposes a kind of endoporus cold spraying spray gun, solves to adopt cold spray technique that the less inner wall surface in aperture is carried out the cold spraying processing, thereby improves the problem of the surface property of inner hole of workpiece wall.
Technical scheme
A kind of endoporus cold spraying spray gun comprises powder feeding joint 1, working gas inlet attack 2, the pre-air chamber 4 of L-type, thermometric joint 6, pressure measuring tie-in 7, powder feeding pipe 8 and Laval nozzle 10; Characterized by further comprising middleware 9; Powder feeding joint 1 places the top of the pre-air chamber 4 of L-type, and the end of the pre-air chamber 4 of L-type is fixedly connected with Laval nozzle 10 by middleware 9; Powder feeding pipe 8 connects powder feeding joints 1, and is connected with Laval nozzle 10 along the through hole of the pre-air chamber 4 interior settings of L-type, at the end of the pre-air chamber 4 of L-type, turn round after straight position be fixed.
Between Laval nozzle 10 and the pre-air chamber 4 of L-type, be provided with the fixed bar 5 of oblique pull.
Be provided with the rising head 3 that powder feeding joint 1 and 2 working gas inlet attacks are installed on the top of the pre-air chamber 4 of L-type.
Described Laval nozzle 10 divergence ratios are 4～10.
Described working gas inlet attack 2 is two.
Beneficial effect
A kind of endoporus cold spraying spray gun that the present invention proposes, position and the approach of change powder feeding, the vertical segment length of pre-air chamber can be determined according to actual conditions, adopt two parts processing.Packed into after the powder feeding pipe by the top of pre-air chamber, adopt welding that two parts are coupled together, miscellaneous part adopts and is threaded, and is convenient to dismounting, and adopts the effect that reaches sealing of ball cone match.In addition, the working gas in the pre-air chamber can also play the indirect auxiliary heating effect to gas powder in the powder feeding pipe.
A kind of easy, endoporus cold spraying spray gun low cost of manufacture, that relative size is less will have engineering significance very much.This can realize that not only the endoporus cold spray technique processes the less inner wall surface in aperture being carried out cold spraying, prepares coating at the inwall of workpiece, can also realize the reparation of workpiece and can make again, thereby improve the surface property of inner hole of workpiece wall.
Description of drawings
Fig. 1 is 3-D solid structure schematic diagram of the present invention;
Fig. 2 is planar elevation view of the present invention;
Fig. 3 is nozzle implementation structural representation of the present invention;
1-powder feeding joint, 2-working gas inlet attack, 3-rising head, the pre-air chamber of 4-L-type, 5-fixed bar, 6-thermometric joint, 7-pressure measuring tie-in, 8-powder feeding pipe, 9-middleware, 10-Laval nozzle, 10-1-nozzle entrance section, 10-2-nozzle contraction section, 10-3-nozzle throat, 10-4-nozzle expansion segment, 10-5-jet expansion diameter.
The specific embodiment
Now in conjunction with the embodiments, the invention will be further described for accompanying drawing:
The technical scheme that the embodiment of the invention adopts provides a kind of endoporus cold spraying spray gun that stretches into smaller aperture due, it is characterized in that: powder feeding joint 1, working gas inlet attack (2) 2, rising head 3, pre-air chamber 4, fixed bar 5, thermometric joint 6, pressure measuring tie-in 7, powder feeding pipe 8, middleware 9, Laval nozzle 10.Powder feeding joint 1 is used for connecting dust feeder; Working gas inlet attack 2 is used for connecting the importing working gas to pre-air chamber 4; Rising head 3 is used for sealing pre-air chamber 4, and connects powder feeding joint 1 and working gas inlet attack 2; Pre-air chamber 4 is used for making behind the steady air current of importing again flow nozzle 10, can also carry out to the powder of supplying gas in the powder feeding pipe 8 heat effect to a certain degree, wherein gas temperature and pressure can obtain by thermometric joint 6 and pressure measuring tie-in 7 respectively in the pre-air chamber, are used for on-line monitoring; Fixed bar 5 is used for connecting nozzle 10 and pre-air chamber 4, and adopts bolt and nut fastening, and fixedly spray gun is whole in cold spray process, prevents the percussion of air-flow; Powder feeding gas first through vertical section of powder feeding pipe 8 and then by rear axle to horizontal segment powder is sent into the contraction section 10-2 of nozzle 10; Middleware 9 is used for connecting pre-air chamber 4 and nozzle 10; Laval nozzle 10 with the powder quick particle, thereby prepares coating for generation of supersonic airstream.
Working gas can be selected pure gas (compressed air, nitrogen, argon gas, helium) or their mist in this endoporus cold spraying spray gun; Can be operated in high pressure (1.0～4.0MPa) or low pressure (under 0.4～1.0MPa) the gas condition; Gas temperature can be between ° C of room temperature～800.
The nozzle of endoporus cold spraying spray gun is based on the contraction of FLUENT software optimization design-expanding Laval nozzle, and this endoporus cold spraying spray gun can be realized the preparation of the coatings such as simple metal, alloy, metal-base composites, nano structural material.
Fig. 1 and Fig. 2 are the schematic diagram of present embodiment, are comprised of cap mouth 3, pre-air chamber 4, fixture 5, powder feeding pipe 8, middleware 9 and nozzle 10.Powder feeding joint 1 connects powder feeder, powder is by vertical section in the cap mouth 3 importing powder feeding pipe 8, when adopting single working gas, the working gas of (temperature is between 100～800 ° of C) (high pressure or low pressure) imports to (this moment, another gas access joint was closed) in the pre-air chamber 4 through the joint of one of two working gas entrances after the preheating; When adopting hybrid working gas, two working gas inlet attacks 2 all connect air supply plant, working gas through the gas-heating apparatus preheating flows in the pre-air chamber 4 by cap mouth 3, the working gas of preheating can carry out indirectly heat effect to the powder in the powder feeding pipe 8 in the at this moment pre-air chamber 4, powder has flowed to flat segments by vertical section in the powder feeding pipe 8, at this moment, working air current is to also changing horizontal direction into, wherein the gas temperature in the pre-air chamber and pressure can obtain by thermometric joint 6 and pressure measuring tie-in 7 respectively, be used for on-line monitoring spray gun entrance front gas temperature and pressure, meanwhile, the powder feeding gas that working gas carries powder to be sprayed enters nozzle contraction section 10-2 by nozzle entrance 10-1, formation is confluxed and through the pinch effect of nozzle contraction section 10-2,10-3 reaches velocity of sound at nozzle throat, then enter downstream nozzle expansion segment 10-4, produce Supersonic Flow at nozzle expansion segment 10-4, after the high speed operation air-flow accelerates.Particle flies out behind the jet expansion 10-5, and the inner hole wall of striking work if particle rapidity surpasses critical speed, just can form coating.
Nozzle 10 is critical component in the present embodiment, is the contraction-expanding Laval nozzle through FLUENT software optimization design.Fig. 3 is a specific embodiment of nozzle among the present invention: be applied in the aperture and be 70mm or greater than the parts of 70mm, be the flat segments of a diameter 8mm, length 10mm before the nozzle entrance section 10-1; Nozzle entrance section 10-1 diameter is 8mm, and nozzle contraction section 10-2 length is 10mm; Nozzle throat 10-3 diameter is 2mm; Nozzle expansion segment 10-4 length is 40mm; Jet expansion diameter 10-5 is 5mm.It more than is the size of nozzle key position in this specific embodiment, but according to the engineering application state of reality can also be suitable the adjustment nozzle in following size: (guarantee divergence ratio 4～10, this embodiment is 6.25 for jet expansion 10-5 diameter and the 10-3 of throat diameter in the length of nozzle downstream expansion segment 10-4 and the nozzle 10; Guarantee that expansion segment length is long as far as possible).
Claims (5)
1. an endoporus cold spraying spray gun comprises powder feeding joint (1), working gas inlet attack (2), the pre-air chamber of L-type (4), thermometric joint (6), pressure measuring tie-in (7), powder feeding pipe (8) and Laval nozzle (10); Characterized by further comprising middleware (9); Powder feeding joint (1) places the top of the pre-air chamber of L-type (4), and the end of the pre-air chamber of L-type (4) is fixedly connected with Laval nozzle (10) by middleware (9); Powder feeding pipe (8) connects powder feeding joint (1), and is connected with Laval nozzle (10) along the interior through hole that arranges of the pre-air chamber of L-type (4), is fixed at the end of the pre-air chamber of L-type (4), the rear straight position of turning round.
2. described endoporus cold spraying spray gun according to claim 1 is characterized in that: the fixed bar (5) that is provided with oblique pull between Laval nozzle (10) and the pre-air chamber of L-type (4).
3. described endoporus cold spraying spray gun according to claim 1 and 2 is characterized in that: be provided with the rising head (3) that powder feeding joint (1) and working gas inlet attack are installed on the top of the pre-air chamber of L-type (4).
4. described endoporus cold spraying spray gun according to claim 1, it is characterized in that: described Laval nozzle (10) divergence ratio is 4～10.
5. according to claim 1 or 3 described endoporus cold spraying spray guns, it is characterized in that: described working gas inlet attack (2) is two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220474378.1U CN202877077U (en) | 2012-09-18 | 2012-09-18 | Inner hole cold spraying spray gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220474378.1U CN202877077U (en) | 2012-09-18 | 2012-09-18 | Inner hole cold spraying spray gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202877077U true CN202877077U (en) | 2013-04-17 |
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ID=48068543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220474378.1U Expired - Lifetime CN202877077U (en) | 2012-09-18 | 2012-09-18 | Inner hole cold spraying spray gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202877077U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873011A (en) * | 2012-09-18 | 2013-01-16 | 西北工业大学 | Spray gun for cold spray of inner hole |
| CN105499086A (en) * | 2016-02-02 | 2016-04-20 | 集美大学 | Spraying gun used for cold spraying |
-
2012
- 2012-09-18 CN CN201220474378.1U patent/CN202877077U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102873011A (en) * | 2012-09-18 | 2013-01-16 | 西北工业大学 | Spray gun for cold spray of inner hole |
| CN105499086A (en) * | 2016-02-02 | 2016-04-20 | 集美大学 | Spraying gun used for cold spraying |
| CN105499086B (en) * | 2016-02-02 | 2018-09-18 | 集美大学 | Spray gun for cold spray |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130417 |