CN114918055A - Upstream and downstream powder feeding nozzle for cold spraying and coating cold spraying production system - Google Patents
Upstream and downstream powder feeding nozzle for cold spraying and coating cold spraying production system Download PDFInfo
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- CN114918055A CN114918055A CN202210537872.6A CN202210537872A CN114918055A CN 114918055 A CN114918055 A CN 114918055A CN 202210537872 A CN202210537872 A CN 202210537872A CN 114918055 A CN114918055 A CN 114918055A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1481—Spray pistols or apparatus for discharging particulate material
- B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state
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Abstract
The invention provides an upstream and downstream powder feeding nozzle for cold spraying and a coating cold spraying production system, and relates to the technical field of cold spraying. The upstream and downstream powder feeding nozzle for cold spraying comprises a contraction pipe section, an expansion pipe section and an extension pipe section, wherein the contraction pipe section is communicated with the expansion pipe section, one end, far away from the contraction pipe section, of the expansion pipe section is communicated with the extension pipe section, the contraction pipe section is provided with an upstream powder feeding nozzle, and the extension pipe section is provided with at least one downstream powder feeding nozzle. The upstream powder feeding nozzle and the downstream powder feeding nozzle can realize simultaneous powder feeding of two kinds of powder, the powder feeding is not required to be carried out after the powder is mixed, and the proportion and the speed of the powder are controllable. Meanwhile, independent upstream powder feeding or independent downstream powder feeding can be realized, the disassembly work of nozzle equipment is reduced, the operation difficulty is reduced, the preparation of the gradient coating with uniformly changed powder proportion can be realized, the method is particularly suitable for preparing the composite coating by powder with larger property difference, the structure is simple, and the manufacturing cost is low.
Description
Technical Field
The invention relates to the technical field of cold spraying, in particular to an upstream and downstream powder feeding nozzle for cold spraying and a coating cold spraying production system.
Background
The coating prepared by the cold spraying technology has the advantages of no melting and phase change of materials and no limitation on thickness, and is widely concerned by various enterprises and scientific research institutions.
In the cold spraying process, when a composite coating (at least two kinds of powder) is prepared, at least two kinds of powder are mixed, and then the mixed powder is sent to a laval nozzle through a powder feeder to realize the preparation of the composite coating. For some powders with different properties, some powders are suitable for the process parameters with higher process temperature, and some powders are suitable for the powders with lower process temperature, so that the cold spraying of the composite powder is more difficult to adopt the same process.
Meanwhile, the cold spraying nozzle is worn and blocked when spraying hard alloy powder and low-melting-point powder, the main mode of failure of the nozzle is caused, the main solution is to reduce the spraying process parameters, replace the more wear-resistant nozzle material or reduce the spraying process parameters, and as a result, the performance of the coating cannot reach the required index, the service cycle of the nozzle is short, and the cost is high.
In view of this, the present application is specifically made.
Disclosure of Invention
The invention aims to provide an upstream and downstream powder feeding nozzle for cold spraying and a coating cold spraying production system, which can accurately regulate and control the powder feeding proportion and speed and effectively improve the problem of easy abrasion.
Embodiments of the invention may be implemented as follows:
in a first aspect, the invention provides an upstream and downstream powder feeding nozzle for cold spraying, which comprises a contraction pipe section, an expansion pipe section and an extension pipe section, wherein the contraction pipe section is communicated with the expansion pipe section, one end of the expansion pipe section, which is far away from the contraction pipe section, is communicated with the extension pipe section, the contraction pipe section is provided with an upstream powder feeding nozzle, and the extension pipe section is provided with at least one downstream powder feeding nozzle.
In an alternative embodiment, the upstream powder delivery nozzle is disposed coaxially with the convergent section.
In an alternative embodiment, the downstream powder delivery nozzle is disposed at an angle of 30-90 ° to the side wall in the upstream direction of the elongated tube section.
In an alternative embodiment, the downstream powder delivery nozzle is in vertical communication with a sidewall of the elongated tube section.
In an alternative embodiment, the convergent section and the divergent section are detachably connected.
In an alternative embodiment, the converging tube section is provided with a first collar and the diverging tube section is provided with a first groove, the first collar being threadedly or telescopically coupled to the interior of the first groove thread.
In an alternative embodiment, when the first male ring and the first female sleeve are connected, a sealing ring is further disposed between the first male ring and the first female sleeve.
In an alternative embodiment, the expansion tube segment is removably connected to the extension tube segment.
In an alternative embodiment, the expansion pipe section is provided with a second collar, and the extension pipe section is provided with a second groove, the second collar being screwed or muff-coupled to the inside of the second groove.
In an alternative embodiment, the pipe diameter of the contracted pipe section gradually decreases along the direction from the contracted pipe section to the extended pipe section, the pipe diameter of the expanded pipe section gradually increases along the direction from the contracted pipe section to the extended pipe section, and the pipe diameter of the extended pipe section is uniform and equal to the maximum pipe diameter of the expanded pipe section.
In a second aspect, the present invention provides a coating cold spray production system comprising the upstream and downstream powder feeding nozzles for cold spray according to any one of the preceding embodiments.
The beneficial effects of the embodiment of the invention include, for example:
the invention provides an upstream and downstream powder feeding nozzle for cold spraying, which is provided with an upstream powder feeding nozzle on a contraction pipe section and at least one downstream powder feeding nozzle on an extension pipe section. The upstream powder feeding nozzle and the downstream powder feeding nozzle can realize simultaneous powder feeding of two kinds of powder, the powder feeding is not required to be carried out after the powder is mixed, and the proportion and the speed of the powder are controllable. Meanwhile, independent upstream powder feeding or independent downstream powder feeding can be realized, the disassembly work of the nozzle equipment is reduced, and the operation difficulty is reduced. And the upstream and downstream powder feeding quality can be adjusted in the powder feeding process, so that the preparation of the gradient coating with uniformly changed powder proportion can be realized. For some powders with larger property difference, for example, some powders are suitable for the process parameters with higher process temperature, and some powders are suitable for the powders with lower process temperature, the upstream and downstream powder feeding nozzles for cold spraying provided by the application can be used for preparing the composite coating by simultaneously feeding the powders upstream and downstream to be suitable for the powders with larger property difference. The application provides a cold spraying is with upper and lower reaches powder feeding nozzle simple structure, the cost of manufacture is low. The coating cold spraying production system with the upstream and downstream powder feeding nozzles for cold spraying can realize the preparation of various powder dipping coatings with large quality difference.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic structural view of an upstream and downstream powder feeding nozzle for cold spraying provided in the present application;
fig. 2 is a schematic exploded view of the upstream and downstream powder feeding nozzles for cold spraying provided by the present application.
An icon: 100-an upstream and downstream powder feeding nozzle for cold spraying; 110-a shrink tube section; 111-upstream powder delivery nozzle; 112-a first convex ring; 120-expanding the pipe section; 121-a first groove; 122-a second torus; 130-an extension pipe section; 131-downstream powder feeding nozzle; 132-second groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
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, it need not be further defined or explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are only used to distinguish one description from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1, the present embodiment provides an upstream and downstream powder feeding nozzle 100 for cold spraying, which includes a contraction pipe section 110, an expansion pipe section 120 and an extension pipe section 130, wherein the contraction pipe section 110 is communicated with the expansion pipe section 120, and one end of the expansion pipe section 120 far away from the contraction pipe section 110 is communicated with the extension pipe section 130.
The diameter of the convergent pipe section 110 is gradually reduced along the direction from the convergent pipe section 110 to the extension pipe section 130, the convergent pipe section 110 is provided with an upstream powder feeding nozzle 111, and the upstream powder feeding nozzle 111 is arranged coaxially with the convergent pipe section 110. In the present application, the upstream powder feeding nozzle 111 and the convergent pipe section 110 are coaxially arranged, so that the powder fed from the upstream powder feeding nozzle 111 directly flows with the gas.
The pipe diameter of the expanded pipe section 120 gradually increases in the direction from the contracted pipe section 110 to the extended pipe section 130.
The extended tube section 130 has a uniform tube diameter equal to the maximum tube diameter of the expanded tube section 120. The elongated tube section 130 is provided with at least one downstream powder delivery nozzle 131. The downstream powder feeding nozzle 131 is disposed at an angle of 30 to 90 degrees with respect to the upstream side wall of the extension pipe section 130. In the present application, the downstream powder feeding nozzle 131 and the extension pipe section 130 are disposed at an angle, so that the powder fed from the downstream powder feeding nozzle 131 to the extension pipe can have a certain impact with the powder or gas from the contraction pipe, and the powder fed from the downstream powder feeding nozzle 131 is uniformly distributed. Preferably, in the present application, the downstream powder feeding nozzle 131 is vertically communicated with the sidewall of the extension pipe section 130. In this application, the number of downstream powder feeding nozzles 131 can be decided according to the powder feeding amount, when two kinds of powders are sprayed, the number of downstream powder feeding nozzles 131 is set to 1, when various powders are sprayed, the number of downstream powder feeding nozzles 131 can be set to a plurality of, and the specific amount is reduced by 1 for the sprayed powder.
The structural arrangement of convergent spool piece 110 and divergent spool piece 120 may create a supersonic flow of gas having a pressure and relatively low velocity. The upstream powder feeding nozzle 111 feeds the powder into the contraction pipeline, the powder is rapidly diffused under the impact of the air flow and is driven by the air to move from the upstream to the downstream and is discharged from the discharge port, similarly, the downstream powder feeding nozzle 131 feeds the powder into the extension pipeline, the powder in the extension pipeline drives the powder to move from the downstream to the discharge port under the motion of the air flow, and when the upstream and the downstream are fed simultaneously, the powder fed from the upstream and the powder fed from the downstream can be fully mixed in the extension pipeline.
Further, referring to fig. 2, the convergent pipe section 110, the divergent pipe section 120 and the divergent pipe section 130 may be an integral structure or a segmented structure. Preferably, the contraction pipe section 110, the expansion pipe section 120 and the extension pipe section 130 are all of a segmented structure, and the contraction pipe section 110 and the expansion pipe section 120 are detachably connected, and the expansion pipe section 120 and the extension pipe section 130 are detachably connected.
The detachable sectional type structure is formed among the contraction pipe section 110, the expansion pipe section 120 and the extension pipe section 130, so that the processing is easy, meanwhile, because the nozzle is easy to block or wear in the using process, the sectional type structure can quickly replace the wear and the blocking part, and the rest parts which are not worn or blocked can be continuously used, so that the production cost is effectively reduced, and meanwhile, the processing difficulty is also reduced by the sectional type structure.
There are various ways of removably connecting the converging section 110 to the diverging section 120 and the diverging section 120 to the extending section 130, including but not limited to a threaded connection, a clamp connection, a sleeve connection, etc. Specifically in the present embodiment, which shows a typical but non-limiting example, by providing a first male ring 112 at one end of the converging tube section 110, providing a first groove 121 at one end of the diverging tube section 120, providing a second male ring 122 at the other end, providing a second groove 132 at the extending tube section 130, and providing external threads on the first male ring 112 and the second male ring 122, respectively, providing internal threads within the first groove 121 and the second groove 132, respectively, the first male ring 112 is threaded into the interior of the threads of the first groove 121, and the second male ring 122 is threaded into the interior of the second groove 132. In this embodiment, the collapsible tube section 110, the expandable tube section 120, and the elongated tube section 130 can be detachably connected by the structure of the groove and the convex ring, and the thread processing is easy to implement, and the thread connection is easy to operate and implement during installation and disassembly. It should be understood that the "sleeve connection" in this application means that the first protruding ring 112 can also be directly sleeved inside the first groove 121, and a sealing ring is disposed between the first protruding ring 112 and the first groove 121 for sealing, so as to realize the sleeve connection between the first protruding ring 112 and the first groove 121, in this case, it is not necessary to provide threads on the first protruding ring 112 and the first groove 121. The second male ring 122 and the second female groove 132 may also be connected by means of a sleeve connection.
The current cold spraying is mainly divided into high-pressure and low-pressure cold spraying, the powder of the high-pressure cold spraying is mainly sent through the upstream of the powder sending nozzles 100 for the upstream and the downstream of the cold spraying, and the powder has the characteristics of high pressure and high temperature and is suitable for high-hardness powder materials; the powder for low-pressure cold spraying enters the upstream and downstream powder feeding nozzles 100 for cold spraying mainly from the extension sections of the upstream and downstream powder feeding nozzles 100 for cold spraying, that is, the downstream powder feeding, and is suitable for powder materials with low melting points and the like.
The operation principle of the upstream and downstream powder feeding nozzle 100 for cold spraying provided by the embodiment is as follows: the powder is fed from at least one of the upstream powder feeding nozzle 111 and the downstream powder feeding nozzle 131, respectively, depending on the characteristics of the powder (high hardness powder material, low melting point powder material, or the like).
Embodiment 1:
when the upstream and downstream powder feeding nozzles 100 for cold spraying provided by the present application are used to spray a copper coating, an upstream powder feeding nozzle is used. At this time, the extension is directly detached so that it directly becomes the upstream powder feeding nozzle. The spraying process parameters are set to be 5MPa and 800 ℃.
Embodiment 2:
when the upstream and downstream powder feeding nozzle 100 for cold spraying provided by the application is used for spraying the babbitt metal powder, the upstream powder feeding nozzle 111 is blocked, the upstream powder feeding nozzle is changed into a downstream powder feeding nozzle, the powder enters from the downstream powder feeding nozzle 131, the spraying process parameter is 0.5MPa, and the temperature is set to 350 ℃.
Embodiment 3:
Al/Al spraying by adopting the upstream and downstream powder feeding nozzle 100 for cold spraying 2 O 3 In the case of composite powder, the number of the downstream powder feeding nozzles 131 is set to 1, and at this time, Al powder is fed through the upstream powder feeding nozzle, Al powder 2 O 3 Powder is fed through the downstream, and the parameters of the spraying process are set as follows: the spraying temperature is 350 ℃, the powder feeding pressure of the Al powder is 2MPa, and the Al powder 2 O 3 Powder feeding pressure of 1MPa, Al powder and Al 2 O 3 The mass ratio of the powders is 50: 50.
As can be seen from the foregoing embodiments 1 to 3, the upstream and downstream powder feeding nozzles 100 for cold spraying provided by the present application can achieve operations of independent upstream powder feeding or independent downstream powder feeding or simultaneous upstream and downstream powder feeding, and can adjust the upstream and downstream powder feeding quality during the powder feeding process, thereby achieving the production of gradient coatings with uniformly varying powder ratios. For some powders with larger property differences, for example, some powders are suitable for the process parameters with higher process temperature, and some powders are suitable for the powders with lower process temperature, the upstream and downstream powder feeding nozzles 100 for cold spraying provided by the present application can be used for preparing the composite coating by simultaneously feeding the powders upstream and downstream to be suitable for the powders with larger property differences.
In addition, the application also provides a coating cold spraying production system which comprises the upstream and downstream powder feeding nozzle 100 for cold spraying.
In summary, the present invention provides an upstream and downstream powder feeding nozzle 100 for cold spraying, which is provided with an upstream powder feeding nozzle 111 in the convergent pipe section 110 and at least one downstream powder feeding nozzle 131 in the divergent pipe section 130. The upstream powder feeding nozzle 111 and the downstream powder feeding nozzle 131 can simultaneously feed two kinds of powder, the powder feeding is not required to be carried out after the powder is mixed, and the proportion and the speed of the powder are controllable. Meanwhile, independent upstream powder feeding or independent downstream powder feeding can be realized, the disassembly work of the nozzle equipment is reduced, and the operation difficulty is reduced. And the upstream and downstream powder feeding quality can be adjusted in the powder feeding process, so that the preparation of the gradient coating with uniformly changed powder proportion can be realized. For some powders with different properties, for example, some powders are suitable for the process parameters with higher process temperature, and some powders are suitable for the powders with lower process temperature, the upstream and downstream powder feeding nozzles 100 for cold spraying provided by the present application can be used for preparing composite coatings by simultaneously feeding powder upstream and downstream to be suitable for the powders with different properties. The upstream and downstream powder feeding nozzle 100 for cold spraying provided by the application has the advantages of simple structure and low manufacturing cost. The coating cold spraying production system with the upstream and downstream powder feeding nozzles 100 for cold spraying can realize the preparation of various powder dip coatings with large quality differences.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. The upstream and downstream powder feeding nozzle for cold spraying is characterized by comprising a contraction pipe section, an expansion pipe section and an extension pipe section, wherein the contraction pipe section is communicated with the expansion pipe section, one end, far away from the contraction pipe section, of the expansion pipe section is communicated with the extension pipe section, the contraction pipe section is provided with an upstream powder feeding nozzle, and the extension pipe section is provided with at least one downstream powder feeding nozzle.
2. The upstream and downstream powder feeding nozzle for cold spray according to claim 1, wherein said upstream powder feeding nozzle is provided coaxially with said constricted tube section.
3. The upstream and downstream powder feeding nozzle for cold spray according to claim 1, wherein said downstream powder feeding nozzle is disposed at an angle of 30 to 90 ° to a side wall in an upstream direction of said elongated tube section.
4. The upstream and downstream powder feeding nozzle for cold spray according to claim 1, wherein said convergent tube section and said divergent tube section are detachably connected.
5. The upstream and downstream powder feeding nozzle for cold spray according to claim 4, wherein the convergent pipe section is provided with a first collar, and the divergent pipe section is provided with a first groove, and the first collar is connected to the inside of the first groove by means of a screw or a sleeve.
6. The upstream and downstream powder feeding nozzle for cold spray according to claim 5, wherein a seal ring is further provided between said first male ring and said first female groove when said first male ring and said first female groove are connected to each other.
7. The upstream and downstream powder feeding nozzle for cold spray according to claim 1, wherein the extension pipe section is detachably connected to the extension pipe section.
8. The upstream and downstream powder feeding nozzle for cold spray according to claim 7, wherein the extension pipe section is provided with a second collar, and the extension pipe section is provided with a second groove, and the second collar is connected to the inside of the second groove by means of a screw or a sleeve.
9. The upstream and downstream powder feeding nozzle for cold spraying according to any one of claims 1 to 8, wherein the pipe diameter of the constricted pipe section is gradually reduced in a direction from the constricted pipe section to the extended pipe section, the pipe diameter of the expanded pipe section is gradually increased in a direction from the constricted pipe section to the extended pipe section, and the pipe diameter of the extended pipe section is uniform and equal to the maximum pipe diameter of the expanded pipe section.
10. A coating cold spray production system comprising the upstream and downstream powder feeding nozzles for cold spray according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210537872.6A CN114918055A (en) | 2022-05-17 | 2022-05-17 | Upstream and downstream powder feeding nozzle for cold spraying and coating cold spraying production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210537872.6A CN114918055A (en) | 2022-05-17 | 2022-05-17 | Upstream and downstream powder feeding nozzle for cold spraying and coating cold spraying production system |
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| Publication Number | Publication Date |
|---|---|
| CN114918055A true CN114918055A (en) | 2022-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210537872.6A Pending CN114918055A (en) | 2022-05-17 | 2022-05-17 | Upstream and downstream powder feeding nozzle for cold spraying and coating cold spraying production system |
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| CN (1) | CN114918055A (en) |
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| CN103537391A (en) * | 2013-09-29 | 2014-01-29 | 广州有色金属研究院 | Adjustable two-channel powder feeding device |
| CN104415863A (en) * | 2013-08-31 | 2015-03-18 | 胜赛思精密压铸（扬州）有限公司 | Laval spray pipe for preparing die casting die releasing agent |
| CN105283675A (en) * | 2013-04-17 | 2016-01-27 | 萨姆斯技术公司 | Venturi pump and facility for applying paint coatings |
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|---|---|---|---|---|
| CN1403210A (en) * | 2001-09-05 | 2003-03-19 | 中国科学院金属研究所 | Cold air driven spray painter |
| CN1448223A (en) * | 2003-04-28 | 2003-10-15 | 西安交通大学 | Hollow cathode central axial powder-feeding plasma spraying gun |
| US20060138252A1 (en) * | 2004-12-16 | 2006-06-29 | Keudell Leopold V | Powder conveying device and catching nozzle for the powder conveying device |
| CN1958171A (en) * | 2005-10-31 | 2007-05-09 | 宝山钢铁股份有限公司 | Cold air dynamical spray-painting method and apparatus of delivering powder through down stream |
| WO2007091102A1 (en) * | 2006-02-07 | 2007-08-16 | The Boc Group Plc | Kinetic spraying apparatus and method |
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