CN114471987A - Cold spraying spray gun - Google Patents
Cold spraying spray gun Download PDFInfo
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- CN114471987A CN114471987A CN202210205561.XA CN202210205561A CN114471987A CN 114471987 A CN114471987 A CN 114471987A CN 202210205561 A CN202210205561 A CN 202210205561A CN 114471987 A CN114471987 A CN 114471987A
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- gas
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- mixing chamber
- supply pipe
- cooling
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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
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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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- 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
- B05B7/1404—Arrangements for supplying particulate material
- B05B7/1431—Arrangements for supplying particulate material comprising means for supplying an additional liquid
- B05B7/1436—Arrangements for supplying particulate material comprising means for supplying an additional liquid to a container where the particulate material and the additional liquid are brought together
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Abstract
本发明涉及喷涂设备技术领域，并具体公开了一种冷喷涂喷枪，其包括气粉混合室、设置于气粉混合室内的导流筛、以及分别连接于气粉混合室的供粉管、供气管和喷管。导流筛沿气粉混合室的轴向贯设有第一通孔，并于第一通孔的四周均布一圈或多圈圆周通孔，每个圆周通孔均以统一斜度或螺旋度过渡至导流筛的另一端面；供粉管沿轴向设置于气粉混合室且其出口端插设于第一通孔内；供气管连接于气粉混合室的气体入口，导流筛设置在气体入口之后。供气管输入的喷涂气体通过圆周通孔分散导向形成中心旋流，中心旋流与供粉管的送粉气体快速混合形成气粉混合射流并保持轴向运动进入喷管，以此提高喷涂气体对粉末的加速效果，保证涂层的沉积效率与均匀性。
The invention relates to the technical field of spraying equipment, and specifically discloses a cold spraying spray gun, which comprises an air-powder mixing chamber, a guide screen arranged in the air-powder mixing chamber, and a powder supply pipe and a supply pipe respectively connected to the air-powder mixing chamber. Trachea and nozzle. The guide screen is provided with a first through hole along the axial direction of the gas-powder mixing chamber, and one or more circles of circumferential through holes are evenly distributed around the first through hole, and each circumferential through hole has a uniform slope or spiral It transitions to the other end face of the diversion sieve; the powder supply pipe is axially arranged in the gas-powder mixing chamber and its outlet end is inserted into the first through hole; the gas supply pipe is connected to the gas inlet of the gas-powder mixing chamber to guide A screen is placed after the gas inlet. The spraying gas input from the gas supply pipe is dispersed and guided through the circumferential through holes to form a central swirl flow. The central swirl flow and the powder feeding gas of the powder supply pipe are rapidly mixed to form a gas-powder mixed jet and keep the axial movement into the nozzle, so as to improve the spraying gas. The acceleration effect of the powder ensures the deposition efficiency and uniformity of the coating.
Description
Technical Field
The invention relates to the technical field of spraying equipment, in particular to a cold spraying spray gun.
Background
Cold spraying is a surface modification process in which a spray material is accelerated to impact a substrate by using low-temperature and high-speed gas, so that the spray material is deposited on the surface of the substrate to form a coating. Different from a spraying process of heating a spraying material to be molten by using a heat source, the cold spraying process has the core that the temperature in the process is always lower than the melting point of the spraying material, and the coating preparation is realized by completely utilizing aerodynamic force to drive the spraying material to accelerate impact. The cold spraying spray gun is used as a carrier for realizing acceleration of gas and a spraying material, the speed extreme value and the speed distribution uniformity of the spraying material are influenced by the structure of the spray gun, and the deposition quality of a final coating in a cold spraying process is determined.
At present, a cold spraying spray gun adopting radial or oblique (non-axial) powder feeding is adopted, because the direction of powder entering the spray gun is inconsistent with the direction of gas entering the spray gun, the powder in the spray gun always has radial velocity inertia, so that the powder is unevenly distributed in the spray gun, the velocity distribution difference is large after the powder is accelerated by a spray pipe, and the finally deposited coating is unstable in quality, which is represented by uneven coating binding force, uneven coating surface, fluctuation of porosity and deposition rate and the like; adopt the cold spraying spray gun that the axial sent powder, guaranteed that powder direction of delivery and spray gun acceleration direction maintain unanimously, nevertheless equally because gaseous axial input spray gun simultaneously, because the non-axial of gas gets into inevitable velocity inertia that appears, can certain disturbance appear when leading to gaseous entering spray gun, this disturbance also can transmit to the powder simultaneously, can cause certain powder velocity distribution uneven phenomenon.
Disclosure of Invention
The invention aims to provide a cold spraying spray gun which can convert radial gas into a rotational flow form to be mutually fused and mixed with axially input powder feeding gas, so that the pushing acceleration effect of the spraying gas on powder is improved, and the deposition efficiency and uniformity of a final coating are ensured.
The invention provides a cold spraying spray gun, which comprises a gas-powder mixing chamber, a diversion screen arranged in the gas-powder mixing chamber, and a powder supply pipe, a gas supply pipe and a spray pipe which are respectively connected with the gas-powder mixing chamber; the center of the diversion screen is provided with a first through hole along the axial direction of the gas-powder mixing chamber, one circle or more circles of circumferential through holes are uniformly distributed around the first through hole, and the circumferential through holes are all transited to the other end face of the diversion screen by uniform inclination or helicity; the powder supply pipe is axially arranged in the gas-powder mixing chamber, and the outlet end of the powder supply pipe is inserted into the first through hole of the flow guide sieve and used for supplying powder supply gas to the spray pipe; the gas supply pipe is connected to a gas inlet of the gas-powder mixing chamber and used for providing spraying gas for the spray pipe; the flow guide sieve is arranged behind the gas inlet and used for enabling the spraying gas to be dispersed and guided to form a central rotational flow after passing through the circumferential through hole, so that the central rotational flow and the powder feeding gas of the powder supply pipe are quickly mixed to form a gas-powder mixed jet flow and keep moving axially to enter the spray pipe.
Furthermore, a chamber cover is arranged at the inlet end of the gas-powder mixing chamber, a second through hole penetrates through the center of the chamber cover along the axial direction of the gas-powder mixing chamber, the inlet end of the powder supply pipe is fixed to the second through hole of the chamber cover, and the inlet end of the powder supply pipe is externally connected with a powder supply pipeline.
Further, the gas inlet is radially opened along the wall of the gas-powder mixing chamber.
Furthermore, the gas supply pipe comprises an inlet pipeline connected to the gas inlet and a gas supply pipeline bent and extending to the inlet pipeline, and the gas supply direction of the gas supply pipeline is the same as the powder feeding direction of the powder feeding pipe.
Furthermore, the inner diameter of the spray pipe is in a pipe type structure with the trend of gradually reducing and then gradually expanding along the gas direction.
Furthermore, the connection part of the gas-powder mixing chamber and the spray pipe is sealed by adopting a cambered surface and is locked and fixed through a nut.
Furthermore, the outer surface of the spray pipe is sleeved with a cooling pipe sleeve, the cooling pipe sleeve is in threaded connection with the spray pipe, and a port where the cooling pipe sleeve and the spray pipe are connected can be sealed in a plane or a cambered surface mode.
Further, the cooling pipe sleeve adopts cooling water circulation or cooling air circulation to realize cooling of the spray pipe.
Furthermore, the cooling pipe sleeve is provided with a cooling cavity larger than the outer diameter of the spray pipe, an internal pipeline is arranged in one side wall of the cooling cavity, the outer surface of the cooling pipe sleeve is provided with a cooling pipe outer inlet and a cooling pipe outer outlet, the inner wall of the cooling cavity is provided with a cooling pipe inner inlet and a cooling pipe inner outlet, the cooling pipe outer inlet is externally connected with a cooling pipeline, and the cooling pipe outer outlet is externally connected with a cooling discharge pipeline, so that a closed cooling circulation loop is formed.
The application provides a pair of cold spraying spray gun, it includes the gas-powder mixing chamber, sets up the water conservancy diversion sieve in the gas-powder mixing chamber and connects in the confession powder pipe, air supply pipe and the spray tube of gas-powder mixing chamber respectively. Wherein, the outlet end of the gas-powder mixing chamber is connected with a spray pipe; the outer diameter of the diversion screen is consistent with the inner diameter of the gas-powder mixing chamber, a first through hole penetrates through the center of the diversion screen along the axial direction of the gas-powder mixing chamber, one circle or more circles of circumferential through holes are uniformly distributed around the first through hole, and the circumferential through holes are all transited to the other end face of the diversion screen by uniform inclination or helicity; the powder supply pipe is axially arranged in the gas-powder mixing chamber, and the outlet end of the powder supply pipe is inserted into the first through hole of the flow guide sieve; the gas supply pipe is connected with a gas inlet of the gas-powder mixing chamber; the water conservancy diversion sieve sets up behind the gas inlet for through the circumference through-hole with the spraying gas dispersion direction formation central whirl of air supply pipe input, make central whirl and the powder feeding gas rapid mixing who supplies the powder pipe form gas-powder mixing efflux and keep axial motion to get into the spray tube, with this improvement spraying gas to the acceleration effect of powder, and then make gas-powder mixing efflux obtain even stable accelerating in the spray tube, guarantee the deposition efficiency and the homogeneity of coating.
Drawings
FIG. 1 is a schematic view of the overall structure of the cold spray gun of the present invention.
FIG. 2 is an exploded view of the cold spray gun of the present invention.
FIG. 3 is a cross-sectional view of the gas-powder mixing chamber of the cold spray gun of the present invention.
Fig. 4 is a schematic structural view of a flow guide screen of the cold spray gun of the present invention.
FIG. 5 is a schematic view showing the internal structure of the gas-powder mixing chamber of the cold spray gun of the present invention.
FIG. 6 is an overall cross-sectional view of the cold spray gun of the present invention.
The reference numerals are explained below:
1. a gas-powder mixing chamber; 101. an inlet end; 102. a gas inlet; 103. an outlet end; 2. a nozzle; 3. cooling the pipe sleeve; 301. an annular cooling flow path; 302. an outer inlet of the cooling pipe; 303. an outer outlet of the cooling tube; 304. an inlet in the cooling pipe; 305. an outlet in the cooling pipe; 4. a powder supply pipe; 5. a gas supply pipe; 6. a flow guide sieve; 601. a first through hole; 602. a circumferential through hole; 7. a chamber lid; 701. a second through hole; 8. and locking the nut.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
In the current spray gun design, a rectifying sieve is utilized to rectify and disperse non-axially input spraying gas, but the rectifying sieve is used for rectifying the gas in a straight hole plate mode, the spraying gas forms a gas form which moves in parallel with axial powder feeding gas through rectification, so that the heat transfer between two groups of gas is slow, the acceleration effect of the powder by the spraying gas is poor, the gas velocity in a gun is uneven, the powder velocity is far lower than the spraying gas velocity, and the like, and the pneumatic spraying performance is unstable.
The cold spraying spray gun provided by the invention has the advantages that under the aim of ensuring axial powder feeding to maintain the acceleration uniformity of powder, the radial input gas is subjected to dispersion and rotational flow guide treatment before gas-powder mixing, so that the spraying gas and the powder feeding gas can be rapidly fused and mixed with each other before entering the spray pipe 2, the mixed gas-powder jet flow keeps consistent with the acceleration direction (axial direction) of the spray gun, the stable and uniform distribution of the powder in the spray gun is maintained without being disturbed by the radial speed, and the acceleration effect and the spraying quality stability of the spray gun are greatly improved.
Referring to fig. 1, the present application provides a cold spray gun, which includes a gas-powder mixing chamber 1, a flow guiding screen 6 disposed in the gas-powder mixing chamber 1, and a powder supply pipe 4, a gas supply pipe 5 and a spray pipe 2 respectively connected to the gas-powder mixing chamber 1.
Referring to fig. 2 and 3, the gas-powder mixing chamber 1 is a carrier member in the spray gun into which spray powder and spray gas enter and mix. The outlet end 103 of the gas-powder mixing chamber 1 is connected with the spray pipe 2, the spraying powder and the spraying gas are uniformly mixed after entering the gas-powder mixing chamber 1 through a pipeline, and the mixed gas-powder mixed jet flows out of the outlet end 103 of the gas-powder mixing chamber 1 in the axial direction and enters the spray pipe 2. The connection part of the gas-powder mixing chamber 1 and the spray pipe 2 is sealed by adopting a cambered surface and is fixed by a locking nut 8.
The diversion screen 6 is arranged in the gas-powder mixing chamber 1 and divides the gas-powder mixing chamber 1 into a front section pipeline and a rear section pipeline; a front-section pipeline is arranged between the inlet end 101 of the gas-powder mixing chamber 1 and the flow guide sieve 6, and a rear-section pipeline is arranged between the outlet end 103 of the gas-powder mixing chamber 1 and the flow guide sieve 6.
Referring to fig. 4, a first through hole 601 is formed in the center of the diversion screen 6 along the axial direction of the gas-powder mixing chamber 1, one or more circles of circumferential through holes 602 are uniformly distributed around the first through hole 601, and the outer diameter of the diversion screen 6 is consistent with the inner diameter of the gas-powder mixing chamber 1, so that the gas can only enter the rear-section pipeline of the gas-powder mixing chamber 1 through the circumferential through holes 602 on the diversion screen 6 after entering the gas-powder mixing chamber 1. The circumferential through holes 602 are all transited to the other end face of the flow guide sieve 6 by uniform inclination or spiral degree, and disperse and guide the gas entering the gas-powder mixing chamber 1, so that the gas passes through the flow guide sieve 6 to form a rotational flow distributed along the axis, and the spraying gas can be mutually fused and mixed with the powder feeding gas input from the axis of the gas-powder mixing chamber 1 in a rotational flow mode after passing through the flow guide sieve 6 to form uniformly distributed gas-powder mixed jet flow, thereby improving the acceleration effect of the spraying gas on pushing the powder.
The powder supply pipe 4 is arranged along the axial direction of the gas-powder mixing chamber 1, and one end of the powder supply pipe 4 is inserted into the first through hole 601 of the flow guide sieve 6 so as to be used for axially feeding powder to the gas-powder mixing chamber 1.
The inlet end 101 of the gas-powder mixing chamber 1 is provided with a chamber cover 7, and the chamber cover 7 is in sealing connection with the inlet end 101 of the gas-powder mixing chamber 1 through a flange. A second through hole 701 penetrates through the center of the chamber cover 7 along the axial direction of the gas-powder mixing chamber 1, one end of the powder supply pipe 4 sequentially penetrates through the second through hole 701 of the chamber cover 7, the other end of the powder supply pipe is inserted into the first through hole 601 of the flow guide sieve 6, and the powder supply pipe 4 is externally connected with a powder conveying pipeline; the powder supply pipe 4 is connected with the second through hole 701 through threads, and the powder supply pipe 4 is connected with an external powder feeding pipeline through the second through hole 701. The chamber cover 7 can be used for fixedly installing the powder supply pipe 4 and can be opened to provide convenience when the powder supply pipe 4 and the diversion screen 6 are installed or the spray gun is cleaned.
In use, the diversion screen 6 is firstly arranged at the tail end of the powder supply pipe 4, then the diversion screen 6 and the powder supply pipe 4 are arranged in the gas-powder mixing chamber 1 together, and finally the chamber cover 7 is locked and sealed. Referring to fig. 5, in particular, the diversion screen 6 should be installed and fixed between the gas inlet 102 of the gas-powder mixing chamber 1 and the outlet end 103 of the gas-powder mixing chamber 1 to ensure that the spraying gas flows into the rear pipeline of the gas-powder mixing chamber 1 after passing through the diversion screen 6 after entering the gas-powder mixing chamber 1.
The gas supply pipe 5 is externally connected with a gas supply pipeline, a gas inlet 102 of the gas supply pipe 5 on the gas-powder mixing chamber 1 is positioned between an inlet end 101 of the gas-powder mixing chamber 1 and the flow guide screen 6, specifically, the gas inlet 102 is radially arranged along the chamber wall of the gas-powder mixing chamber 1, and the gas supply pipe 5 is communicated with the gas-powder mixing chamber 1 through the gas inlet 102. The design of axial powder feeding and radial gas feeding ensures that the movement direction of the spraying powder is consistent with the acceleration direction after the spraying powder enters the spray gun, avoids the turbulent flow phenomenon caused by velocity inertia when the spraying gas is input in the radial direction, and improves the stability of spraying because the powder is uniformly distributed in the spray gun; the spraying gas sent in the radial direction is subjected to dispersion guiding of the spraying gas by the aid of the diversion screen 6, so that the spraying gas enters the gas-powder mixing chamber 1 in a central rotational flow mode, and then is rapidly mixed with the powder feeding gas to form gas-powder mixed jet flow and keep axial movement to enter the spray pipe 2, the gas-powder mixed jet flow is accelerated uniformly and stably in the spray pipe 2, and pneumatic acceleration performance of the spray gun to the spraying powder is improved.
The gas supply pipe 5 has an inlet pipe connected to the gas inlet 102 of the gas-powder mixing chamber 1 and a gas supply pipe bent to extend to the inlet pipe. Preferably, the air supply pipe 5 has a bent portion at a right angle so that the air supply pipe is in the same direction as the powder supply pipe. Because need use mechanical mobile device for example manipulator centre gripping operation during the application, to different spraying contours, the range and the angle of removal are great, and the relative position can be fixed to two sets of pipelines behind the syntropy in the centre gripping removes spraying operation, and the input of unified gas, powder that carries on at an input makes things convenient for circuit layout and reduces the pipeline interference when the centre gripping removes spraying operation.
Referring to fig. 6, the nozzle 2 is a pipeline with a variable inner diameter, and the inner diameter is arranged in a pipe shape structure that gradually decreases and then gradually expands along the gas direction, i.e. the flow line changes in a manner of gradually decreasing and gradually expanding. The gas-powder mixed jet is changed from subsonic speed to supersonic speed through the change of pipe diameter of gradually reducing and then gradually expanding.
The outer surface of the spray pipe 2 is provided with a cooling pipe sleeve 3 in a nested mode, and the cooling pipe sleeve 3 is connected with the spray pipe 2 in a threaded mode. A cooling cavity with the outer diameter larger than that of the spray pipe 2 is arranged in the cooling pipe sleeve 3, and the spray pipe 2 is sleeved in the cooling cavity. During installation, openings are formed in both axial ends of the cooling pipe sleeve 3, the openings in both ends of the cooling pipe sleeve are respectively embedded and fixedly installed in both ends of the spray pipe 2, and the connection part of the openings in both ends of the cooling pipe sleeve 3 and the spray pipe 2 can be sealed by adopting a plane or a cambered surface. When installed, an annular cooling flow path 301 is formed between the outer surface of the nozzle 2 and the cooling cavity.
An internal pipeline is arranged in one side wall of the cooling cavity, the outer surface of the cooling pipe sleeve 3 is provided with a cooling pipe outer inlet 302 and a cooling pipe outer outlet 303, the inner wall of the cooling cavity is provided with a cooling pipe inner inlet 304 and a cooling pipe inner outlet 305, the cooling pipe outer inlet 302 is externally connected with a cooling pipeline, and the cooling pipe outer outlet 303 is externally connected with a cooling discharge pipeline, so that a closed cooling circulation loop is formed. The cooling medium enters from the cooling pipe outer inlet 302, flows into the annular cooling flow path 301 through the cooling pipe inner inlet 304, flows out through the cooling pipe inner outlet 305, and is finally discharged from the cooling pipe outer outlet 303. One of the recirculating cooling loops is shown in FIG. 6 by the direction of the arrows. It is understood that the positions of the cooling tube external inlet 302 and the cooling tube external outlet 303 can be switched according to the placement direction of the spray gun, and the direction of the cooling tube external outlet 303 is preferably the same as the direction of the powder feeding pipeline, so as to facilitate the layout and reduce the pipeline interference during the clamping and moving spraying operation. Cooling water circulation or cooling air circulation or other cooling media can be adopted in the cooling pipe sleeve 3 to cool the spray pipe 2 so as to prevent powder flowing in the spray pipe 2 from being softened by heat and being adhered to the inner pipe wall of the spray pipe 2 to cause blockage.
The application provides a cold spraying spray gun, it includes gas-powder mixing chamber 1, sets up the water conservancy diversion sieve 6 in gas-powder mixing chamber 1 and connects respectively in gas-powder mixing chamber 1's confession powder pipe 4, air supply pipe 5 and spray tube 2. Wherein, the outlet end 103 of the gas-powder mixing chamber 1 is connected with the spray pipe 2; the outer diameter of the diversion screen 6 is consistent with the inner diameter of the gas-powder mixing chamber 1, the diversion screen 6 is provided with a first through hole 601 along the axial direction of the gas-powder mixing chamber 1, one circle or more circles of circumferential through holes 602 are uniformly distributed around the first through hole 601, and the circumferential through holes 602 are all transited to the other end face of the diversion screen 6 by uniform inclination or helicity; the powder supply pipe 4 is arranged along the axial direction of the gas-powder mixing chamber 1, and one end of the powder supply pipe 4 is inserted into the first through hole 601 of the flow guide sieve 6 so as to be used for axially feeding powder to the gas-powder mixing chamber 1; spraying gas enters the gas-powder mixing chamber 1 through the gas supply pipe 5 and is dispersedly guided by the circumferential through holes 602 of the flow guide sieve 6, so that the formed central rotational flow is rapidly mixed with powder feeding gas of the powder supply pipe 4 to form gas-powder mixed jet flow, the gas-powder mixed jet flow keeps axial movement and enters the spray pipe 2, and the gas-powder mixed jet flow is uniformly and stably accelerated in the spray pipe 2.
According to the invention, the uniformity of the input of the spraying powder is ensured by feeding the powder in the axial direction, the disturbance of the axial powder feeding caused by the spraying gas is avoided by feeding the spraying gas in the radial direction, and the spraying gas is dispersedly guided by the diversion screen 6 before the spraying powder is mixed with the spraying gas, so that the spraying gas fed in the radial direction is converted into the rotational flow moving in the axial direction, the uniform mixing of the spraying gas and the powder can be rapidly realized, the acceleration effect of the spraying gas on the spraying powder is further improved after the gas and the powder are mixed, the acceleration capability of the spraying gun on the gas-powder mixed jet flow is obviously improved, and the deposition efficiency and uniformity of the final coating are ensured. And the integrated transportation of gas, powder and cooling in cold spraying is realized by combining the directions of the passages of the gas, powder and cooling pipelines, so that spraying operation is conveniently carried out by clamping a spray gun by using mobile equipment, the stable implementation of a spraying process is ensured, the interference of different pipelines is avoided, and a basic support is provided for the development of a cold spraying automatic process. In addition, the spray gun is processed and used, and through spraying experiments, the spraying stability and the pneumatic acceleration effect of powder are improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, but rather is intended to cover all equivalent structural changes made by the use of the specification and drawings.
Claims (9)
1. A cold spraying spray gun is characterized by comprising a gas-powder mixing chamber, a diversion screen arranged in the gas-powder mixing chamber, and a powder supply pipe, a gas supply pipe and a spray pipe which are respectively connected with the gas-powder mixing chamber;
the center of the diversion screen is provided with a first through hole along the axial direction of the gas-powder mixing chamber, one circle or more circles of circumferential through holes are uniformly distributed around the first through hole, and the circumferential through holes are all transited to the other end face of the diversion screen by uniform inclination or spiral degree; the powder supply pipe is axially arranged in the gas-powder mixing chamber, and the outlet end of the powder supply pipe is inserted into the first through hole of the flow guide sieve and used for supplying powder supply gas to the spray pipe; the gas supply pipe is connected to a gas inlet of the gas-powder mixing chamber and used for providing spraying gas for the spray pipe; the flow guide sieve is arranged behind the gas inlet and used for enabling the spraying gas to be dispersed and guided to form a central rotational flow after passing through the circumferential through hole, so that the central rotational flow and the powder feeding gas of the powder supply pipe are quickly mixed to form a gas-powder mixed jet flow and keep moving axially to enter the spray pipe.
2. The cold spray gun according to claim 1, wherein a chamber cover is provided at an inlet end of the gas-powder mixing chamber, a second through hole is formed in the center of the chamber cover along an axial direction of the gas-powder mixing chamber, an inlet end of the powder supply pipe is fixed to the second through hole of the chamber cover, and the inlet end of the powder supply pipe is used for externally connecting a powder supply pipeline.
3. The cold spray gun of claim 2 wherein said gas inlet is open radially along a wall of said gas-powder mixing chamber.
4. The cold spray gun of claim 3, wherein said gas supply tube comprises an inlet pipe connected to said gas inlet and a gas supply pipe extending in a bent manner to said inlet pipe, and a gas supply direction of said gas supply pipe is the same as a powder feeding direction of said powder feeding pipe.
5. The cold spray gun according to any one of claims 1 to 4, wherein the nozzle has a tubular structure having an inner diameter that tends to gradually decrease and then gradually increase in a gas direction.
6. The cold spray gun of claim 5 wherein the junction of the gas-powder mixing chamber and the lance is sealed with a cambered surface and secured by a nut.
7. The cold spray gun of claim 6, wherein the outer surface of the nozzle is sleeved with a cooling sleeve, the cooling sleeve is in threaded connection with the nozzle, and the connection port of the cooling sleeve and the nozzle can be sealed by a plane or a cambered surface.
8. The cold spray gun of claim 7 wherein said cooling jacket utilizes cooling water or cooling air circulation to provide cooling to said spray tube.
9. The cold spray gun according to claim 8, wherein the cooling jacket is provided with a cooling cavity having an outer diameter larger than that of the nozzle, an inner pipeline is provided in a sidewall of the cooling cavity, an outer inlet and an outer outlet of the cooling jacket are provided on an outer surface of the cooling jacket, an inner inlet and an inner outlet of the cooling jacket are provided on an inner wall of the cooling cavity, the outer inlet of the cooling jacket is externally connected to a cooling pipeline, and the outer outlet of the cooling jacket is externally connected to a cooling discharge pipeline, thereby forming a closed cooling circulation loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210205561.XA CN114471987A (en) | 2022-03-02 | 2022-03-02 | Cold spraying spray gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210205561.XA CN114471987A (en) | 2022-03-02 | 2022-03-02 | Cold spraying spray gun |
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| CN114471987A true CN114471987A (en) | 2022-05-13 |
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| CN202210205561.XA Pending CN114471987A (en) | 2022-03-02 | 2022-03-02 | Cold spraying spray gun |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115305467A (en) * | 2022-08-31 | 2022-11-08 | 浙江柯蓝工贸有限公司 | Alloy spraying gun for manufacturing cooking pot body and spraying method thereof |
| CN115365022A (en) * | 2022-08-30 | 2022-11-22 | 中国人民解放军陆军装甲兵学院 | Particle jet nozzle |
| CN115814975A (en) * | 2022-11-22 | 2023-03-21 | 浙江理工大学 | A cold spray gun |
| CN119525045A (en) * | 2025-01-22 | 2025-02-28 | 中铁十局集团城建工程有限公司 | Sprinkler device for shotcrete |
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| CN115305467A (en) * | 2022-08-31 | 2022-11-08 | 浙江柯蓝工贸有限公司 | Alloy spraying gun for manufacturing cooking pot body and spraying method thereof |
| CN115305467B (en) * | 2022-08-31 | 2024-03-29 | 浙江柯蓝工贸有限公司 | Alloy spraying gun for manufacturing cooking pot and spraying method thereof |
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| CN119525045A (en) * | 2025-01-22 | 2025-02-28 | 中铁十局集团城建工程有限公司 | Sprinkler device for shotcrete |
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