Electrostatic powder sprayer

Abstract

The invention relates to an electrostatic powder sprayer which comprises a gun body, a high-voltage module, an air duct assembly, a scattering head and an electrode needle. The air duct assembly comprises a spray pipe, the spray pipe is provided with a first channel and a positioning column coaxial with the first channel, the end, facing the scattering head, of the positioning column is provided with a step and a first through hole, the outer surface of the spray pipe is provided with a first groove, the first through hole is communicated with the first groove, and the scattering head detachably sleeves the step through a second through hole. The electrode needle penetrates through the first through hole and the second through hole, and the two ends of the electrode needle penetrate out of the second through hole and the first groove respectively. The electrostatic powder sprayer has the following advantages that only the scattering head can be disassembled and assembled, and the replacement difficulty is small; the scattering head is sleeved on the step, the precise mounting position of the scattering head can be ensured due to the limitation of the step, and the electrode needle only needs to penetrate through the second through hole section again; through the design of the first groove, the state of the electrode needle can be observed after the electrode needle penetrates out of the first through hole, and penetrating of the electrode needle is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of powder electrostatic spraying, and in particular to an electrostatic powder spray gun. Background Art

[0002] In the prior art, as disclosed in the Chinese invention patent publication No. CN101534956A, a powder spraying discharge assembly is provided, a powder spraying discharge assembly for connecting to an electrostatic spray gun, the gun having a gun body, means for connecting to a coating powder supply source, and means for supplying voltages at a first and a second potential respectively for a first electrical connection and a second electrical connection, each electrical connection for connecting to a respective one of a discharge electrode and a counter electrode, the means for supplying voltages including: a variable voltage power supply having an input terminal connected to the power supply; an output terminal connected to each of the first and second electrical connections; a control circuit for controlling the variable voltage power supply; and means for sensing the output load, wherein the control circuit is adapted to adjust the variable voltage power supply to decrease the voltage and current in proportion to an increase in the sensed load, or vice versa. However, the discharge electrode wire needs to be threaded through the shaft and the centering device, and the shaft and the centering device are at a 90° angle to each other, and the threading state of the discharge electrode wire inside cannot be observed, making the threading difficult. Also, the flaring deflector is integrally formed with the front end of the shaft. When replacing deflectors of different shapes, the shaft needs to be replaced together, and since the discharge electrode wire is threaded through the shaft, it needs to be re-threaded, resulting in high replacement costs and difficulty. Summary of the Invention

[0003] An object of the present application is to provide an electrostatic powder spray gun with convenient threading of the electrode needle and the ability to replace the scattering head individually.

[0004] The technical solution adopted in the present application is: an electrostatic powder spray gun, comprising

[0005] a gun body;

[0006] a high-voltage module for generating high-voltage static electricity;

[0007] an air duct assembly for guiding the flow of gas;

[0008] a scattering head for powder diffusion;

[0009] an electrode needle electrically connected to the high-voltage module;

[0010] The air duct assembly includes a spray pipe, the spray pipe is provided with a first channel and a positioning post coaxial with the first channel, one end of the positioning post facing the scattering head is provided with a step and a first through hole, a first groove is provided on the outer surface of the spray pipe, the first through hole is communicated with the first groove, the scattering head is detachably sleeved on the step through a second through hole, and the electrode needle is threaded through the first through hole and the second through hole and both ends of the electrode needle respectively pass through the second through hole and the first groove.

[0011] Compared with the prior art, the advantages of the present application are as follows: the scattering head protrudes outward and is located at the high-voltage static electricity releasing end of the electrode needle, which is easily damaged. The detachable design of the scattering head allows only the scattering head to be disassembled and assembled, with low replacement difficulty. When performing maintenance, it is not necessary to disassemble the entire electrostatic powder sprayer, which improves the maintenance efficiency. Moreover, by replacing scattering heads of different sizes, the diffusion range of the powder during spraying can be changed, and the scattering head can be replaced according to actual spraying needs, which improves the practicability; the scattering head is sleeved on the step, which facilitates the positioning and installation of the scattering head. Limited by the step, the position of the scattering head can be ensured to be accurate each time it is installed, and the sleeving operation is simple. The electrode needle only needs to be re-passed through the second through-hole section; the design of the first groove enables the state of the electrode needle to be observed after it passes through the first through-hole, which facilitates the passing of the electrode needle.

[0012] In some embodiments of the present application, a connection housing is provided on the spray pipe, the first groove is provided on the connection housing, and one end of the positioning post is connected to the connection housing; the side of the connection housing away from the scattering head is a first arc surface or a first inclined surface; a first flow guiding structure is provided on the side of the connection housing away from the scattering head.

[0013] In some embodiments of the present application, the spray pipe includes a connecting pipe body and a first pipe body and a second pipe body located at both ends of the connecting pipe body. The first groove is located on the connecting pipe body. The cross-sectional area of the connecting pipe body gradually decreases from the side away from the scattering head to the side close to the scattering head; the diameter of the first pipe body is smaller than that of the second pipe body, and the positioning post is located in the first pipe body.

[0014] In some embodiments of the present application, the center line of the second through-hole coincides with the center line of the scattering head; the second through-hole includes a cylindrical portion and a conical portion. One end of the cylindrical portion is sleeved on the step, the other end of the cylindrical portion is connected to one end of the conical portion, and the cross-sectional area of the conical portion gradually decreases from the side close to the cylindrical portion to the side away from the cylindrical portion.

[0015] In some embodiments of the present application, the connection between the scattering head and the positioning post has a smooth transition; the scattering head is in a horn shape; a convex block is provided on the side of the scattering head away from the positioning post, and the side of the convex block away from the positioning post is conical; the electrode needle is passed through the convex block.

[0016] In some embodiments of the present application, a powder cup and a battery pack are provided below the gun body, and both the powder cup and the battery pack are detachably connected to the gun body.

[0017] Furthermore, a blower is further included, and the blower is located in the air duct assembly; the air duct assembly further includes an adapter and an air inlet pipe. The two ends of the adapter are respectively connected to the spray pipe and the air inlet pipe. A notch is provided on the gun body, the air inlet pipe is communicated with the notch, a filter screen is provided on the notch, and a filter sheet is provided between the filter screen and the air inlet pipe.

[0018] Furthermore, the adapter includes an air duct inlet pipe, a powder cup inlet pipe, a powder cup outlet pipe and an air duct outlet pipe. The two ends of the air duct inlet pipe are respectively connected to the air inlet pipe and the powder cup inlet pipe, and the two ends of the air duct outlet pipe are respectively connected to the nozzle and the powder cup outlet pipe. The powder cup inlet pipe and the powder cup outlet pipe are both connected to the powder cup.

[0019] Furthermore, there is an arc-shaped transition between the air duct inlet pipe and the powder cup inlet pipe, and there is an arc-shaped transition between the air duct outlet pipe and the powder cup outlet pipe.

[0020] Furthermore, the air outlet end of the powder cup inlet pipe is provided with at least two powder blowing ports, which are arranged radially along the powder cup inlet pipe; the air outlet end of the powder cup inlet pipe is provided with a baffle, and the powder blowing ports are located between the baffle and the air outlet end of the powder cup inlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural diagram of embodiment 1 of the present invention;

[0022] Figure 2 is a cross-sectional view of Example 1 of the present invention;

[0023] Figure 3 yes Figure 2 A magnified view of part A in FIG;

[0024] Figure 4 This is a schematic diagram of the structure of the nozzle of Example 1 of the present invention. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the structure of the nozzle of Example 1 of the present invention. Figure 2 ;

[0026] Figure 6 1 is a schematic structural diagram of a scattering head according to embodiment 1 of the present invention;

[0027] Figure 7 4 is a cross-sectional view of a scattering head according to Example 1 of the present invention, wherein the scattering head includes an angle θ of 17°;

[0028] Figure 8 4 is a cross-sectional view of a scattering head according to Example 1 of the present invention, wherein the scattering head includes an angle θ of 24.5°;

[0029] Figure 9 yes Figure 2 Enlarged view of part B in .

[0030] In the figure: 1. Gun body; 11. Notch; 111. Filter net; 112. Filter sheet; 12. Barrel; 121. Connection section; 122. Knob; 123. Second convex ring; 13. Handle; 131. Platform; 132. Installation groove; 2. Air duct assembly; 21. Spray pipe; 211. First channel; 212. Positioning post; 2121. Step; 2122. First through hole; 213. First groove; 2131. Second arc surface; 214. Connection housing; 2141. First arc surface; 2142. First flow guiding structure; 215. Connection pipe body; 216. First pipe body; 217. Second pipe body; 218. Connection plate; 2181. Second flow guiding structure; 219. First convex ring; 22. Adapter; 221. Air duct inlet pipe; 2211. First arc-shaped surface; 222. Powder cup inlet pipe; 2221. Powder blowing port; 223. Powder cup outlet pipe; 224. Air duct outlet pipe; 2241. Second arc-shaped surface; 225. Baffle plate; 226. Installation sleeve; 23. Air inlet pipe; 3. Scattering head; 31. Second through hole; 311. Cylindrical part; 312. Conical part; 32. Convex block; 33. Diffusion part; 34. Connection part; 4. Electrode needle; 41. Bent part; 42. First extension part; 43. Second extension part; 5. Powder cup; 6. Battery pack; 61. Installation part; 7. Fan; 8. High-voltage module; 9. Power switch. Detailed implementation mode

[0031] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines the drawings and preferred embodiments to detail the specific implementation mode, structure, features and their effects of the present invention as follows.

[0032] Embodiment 1:

[0033] An electrostatic powder sprayer provided in this embodiment, as Figure 1 、 Figure 2 、 Figure 3 shown, includes

[0034] gun body 1;

[0035] a high-voltage module 8 for generating high-voltage static electricity;

[0036] an air duct assembly 2 for guiding the flow of gas;

[0037] a scattering head 3 for powder diffusion;

[0038] an electrode needle 4 electrically connected to the high-voltage module 8;

[0039] The air duct assembly 2 includes a nozzle 21. The nozzle 21 is provided with a first channel 211 and a positioning post 212 arranged coaxially with the first channel 211. One end of the positioning post 212 facing the scattering head 3 is provided with a step 2121 and a first through hole 2122. A first groove 213 is provided on the outer surface of the nozzle 21. The first through hole 2122 communicates with the first groove 213. The scattering head 3 is detachably sleeved on the step 2121 through a second through hole 31. The electrode needle 4 is inserted through the first through hole 2122 and the second through hole 31, and both ends of the electrode needle 4 penetrate out of the second through hole 31 and the first groove 213 respectively. The high-voltage module 8 adopts a high-voltage electrostatic generator.

[0040] The nozzle 21 is the outermost part of the air duct assembly 2. The first channel 211 thereon is used for powder ejection. The positioning post 212 is coaxial with the first channel 211, which makes the positioning post 212 located at the center of the first channel 211. The distances from the positioning post 212 to the surroundings are the same, and the gas movement around is uniform, ensuring uniform powder delivery and thus making the final spraying effect uniform. The scattering head 3 protrudes outward and is at the high-voltage electrostatic release end of the electrode needle 4, making it prone to damage. The detachable design of the scattering head 3 allows only the scattering head 3 to be disassembled and assembled, with low replacement difficulty. During maintenance, it is not necessary to disassemble the entire electrostatic powder sprayer, improving the maintenance efficiency. Moreover, by replacing scattering heads 3 of different sizes, the powder diffusion range during spraying can be changed, and the scattering head 3 can be replaced according to actual spraying needs, improving the practicality. The cost of separately producing the scattering head 3 is low. The scattering head 3 is sleeved on the step 2121, facilitating the positioning and installation of the scattering head 3. Being restricted by the step 2121 can ensure the accurate installation position of the scattering head 3 each time, and the sleeving operation is simple. The electrode needle 4 only needs to be reinserted through the second through hole 31 section. The design of the first groove 213 enables the state of the electrode needle 4 to be observed after it penetrates out of the first through hole 2122, facilitating the insertion of the electrode needle 4.

[0041] The gun body 1 includes a gun barrel 12 and a handle 13. The high-voltage module 8 is located inside the gun barrel 12, and the air duct assembly 2 is located between the high-voltage module 8 and the handle 13, that is, on the side of the high-voltage module 8 away from the handle 13, making it safer to use. The scattering head 3 is located at the nozzle of the gun barrel 12, and the scattering head 3 extends outward along the longitudinal direction of the gun barrel 12. The angle between the gun barrel 12 and the handle 13 is greater than or equal to 90°.

[0042] The scattering head 3 is coaxial with the positioning post 212, and the powder coming out of the nozzle 21 can contact the scattering head 3 at equal distances, making the powder spread evenly in all directions through the scattering head 3, ensuring uniform spraying and preventing powder accumulation on one side due to different diffusion amplitudes.

[0043] For the reliability of the nozzle 21, such as Figure 5As shown, the nozzle 21 is provided with a connecting housing 214 protruding inwards. The first groove 213 is arranged on the connecting housing 214, and one end of the positioning post 212 is connected to the connecting housing 214; the side of the connecting housing 214 away from the scattering head 3 is a first arc surface 2141 or a first inclined surface; a first flow guiding structure 2142 is provided on the side of the connecting housing 214 away from the scattering head 3. Specifically, the first flow guiding structure 2142 is an inclined surface where two sides intersect, and the included angle between these two inclined surfaces is an acute angle, such that the side surface of the first flow guiding structure 2142 is in a "V" - shaped structure. The connecting housing 214 is used to both connect and fix the positioning post 212 to the nozzle 21 and to provide the setting of the first groove 213. The positioning post 212 and the nozzle 21 are of an integral structure; the side of the connecting housing 214 facing the adapter 22 is a first arc surface 2141, which can reduce the obstruction to gas flow; the first flow guiding structure 2142 can reduce the obstruction to gas flow.

[0044] The bottom surface of the connecting housing 214 cooperates with the bottom surface of the positioning post 212, that is, the bottom surfaces of the connecting housing 214 and the positioning post 212 are both arc surfaces, reducing the obstruction to the air flow; the positioning post 212 and the inner wall of the connecting pipe body 215 are also connected by two connecting plates 218. The two connecting plates 218 are evenly distributed around the positioning post 212 with respect to the connecting housing 214, that is, the included angle between the connecting housing 214 and the connecting plates 218 is 120°; a second flow guiding structure 2181 is provided on the side of the connecting plate 218 away from the scattering head 3; the side of the first groove 213 away from the scattering head 3 is a second arc surface 2131 or a second inclined surface, which can guide the electrode needle 4 to rise obliquely and at the same time limit the electrode needle 4. Specifically, the second flow guiding structure 2181 is an inclined surface of two sides, and the included angle between these two inclined surfaces is an acute angle, such that the side surface of the second flow guiding structure 2181 is in a "V" - shaped structure.

[0045] The electrode needle 4 includes a bent portion 41 and a first extension portion 42 and a second extension portion 43 at both ends of the bent portion 41. The bent portion 41 is located in the first groove 213, the first extension portion 42 passes through the second through - hole 31, and the second extension portion 43 passes through the first groove 213 and is electrically connected to the high - voltage module 8.

[0046] For the reliability of the nozzle 21, such as Figure 4As shown, the nozzle 21 includes a connecting pipe body 215, a first pipe body 216 and a second pipe body 217 located at both ends of the connecting pipe body 215. The first groove 213 is located on the connecting pipe body 215, and the cross-sectional area of the connecting pipe body 215 gradually decreases from the side far away from the scattering head 3 to the side close to the scattering head 3; the diameter of the first pipe body 216 is smaller than that of the second pipe body 217, and the positioning post 212 is located inside the first pipe body 216. The small diameter of the first pipe body 216 can increase the powder ejection speed; the settings of the connecting housing 214 and the connecting plate 218 will both reduce the cross-sectional area through which the gas passes, causing the gas flow rate to increase when passing through. After the gas passes through the connecting housing 214 and the connecting plate 218, the cross-sectional area through which the gas can pass increases, causing the gas flow rate to decrease, resulting in unstable air flow. The connecting pipe body 215 is located between the first pipe body 216 and the second pipe body 217 and is in the part where the gas flow rate gradually increases. The connecting housing 214 and the connecting plate 218 are arranged on this section of the connecting pipe body 215, so that after the gas passes through the connecting housing 214 and the connecting plate 218, the cross-sectional area through which the gas can pass is still smaller than the cross-sectional area through which the gas can pass in the connecting pipe body 215, ensuring the stability of the gas flow rate.

[0047] Two first convex rings 219 are provided on the outer surface of the first pipe body 216, and two second convex rings 123 facing the first pipe body 216 are provided on the gun barrel 12. The two first convex rings 219 are located between the two second convex rings 123, and the sides of the two first convex rings 219 are respectively in contact with the sides of the two second convex rings 123. Through the cooperation of the first convex ring 219 and the second convex ring 123, the movement of the first pipe body 216 is restricted by the gun barrel 12, ensuring the stability of the outlet of the first channel 211.

[0048] To ensure the reliable installation of the electrode needle 4, the center line of the second through hole 31 coincides with the center line of the scattering head 3. The design of the second through hole 31 can not only facilitate the penetration of the electrode needle 4 inside the scattering head 3, but also be used for cooperative installation with the step 2121; the center line of the second through hole 31 coincides with the center line of the scattering head 3, so that the electrode needle 4 is on the center line of the scattering head 3, and the electrostatic field radiated by the electrode needle 4 is evenly distributed relative to the center of the scattering head 3, which also makes the powder surrounding the scattering head 3 uniformly charged, ensuring the uniformity of the spraying effect.

[0049] To ensure the structural reliability of the second through hole 31, the second through hole 31 includes a cylindrical portion 311 and a conical portion 312. One end of the cylindrical portion 311 is sleeved on the step 2121, and the other end of the cylindrical portion 311 is connected to one end of the conical portion 312. The cross-sectional area of the conical portion 312 gradually decreases from the side close to the cylindrical portion 311 to the side away from the cylindrical portion 311. The cylindrical portion 311 has a large space, which facilitates the passage of the electrode needle 4. The inclined surface of the conical portion 312 can guide the electrode needle 4 and ensure the passage of the electrode needle 4. At the same time, the small aperture of the outlet end of the conical portion 312 can prevent the electrode needle 4 from shaking due to excessive gap, ensuring the reliable installation of the electrode needle 4.

[0050] To ensure smooth powder discharge, the connection between the scattering head 3 and the positioning post 212 is smoothly transitioned. The powder-carrying airflow can stably flow along the outer surfaces of the positioning post 212 and the scattering head 3, without being obstructed by height differences or causing powder accumulation. This smooth airflow ensures stable powder discharge. Specifically, the bottom surface of the scattering head 3 is aligned with the bottom surface of the step 2121; the diameter of the bottom surface of the scattering head 3 is the same as the diameter of the bottom surface of the step 2121.

[0051] like Figure 6 As shown, the diffuser head 3 includes a diffuser portion 33 and a connecting portion 34. The diffuser portion 33 is horn-shaped, with its opening facing away from the positioning post 212. There is a smooth transition between the diffuser portion 33 and the connecting portion 34. The maximum cross-sectional diameter of the connecting portion 34 gradually increases from the side closest to the positioning post 212 to the side away from the positioning post 212. The diffuser portion 33 is used to guide powder diffusion outward, while the connecting portion 34 is used to guide powder from the nozzle 21 to the diffuser portion 33. The horn-shaped diffuser portion 33 allows powder to diffuse outward along the horn-shaped diffuser portion 33, forming a cloud-like spray pattern and a large spray area. The gradually increasing diameter of the connecting portion 34 better guides powder movement to the diffuser portion 33.

[0052] The diffuser 33 is provided with a protrusion 32 on the side away from the positioning post 212. The side of the protrusion 32 away from the positioning post 212 is conical in shape. The centerline of the protrusion 32 coincides with the centerline of the diffuser 33. The electrode needle 4 is inserted through the protrusion 32. The side of the protrusion 32 away from the connecting portion 34 extends beyond the side of the diffuser 33 away from the connecting portion 34. The trumpet-shaped diffuser 33 has a relatively thin outwardly extending portion, which is easily deformed by collisions. The design of the protrusion 32 enhances the structural strength of the diffuser 33, making it less susceptible to deformation and extending its service life. The front end of the protrusion 32 is conical, saving material and enhancing its appearance. The second through hole 31 extends through the protrusion 32, allowing the electrode needle 4 to pass through. The protrusion 32 extends beyond the diffuser 33, which in turn ensures that the electrode needle 4 also extends beyond the diffuser 33 after passing through, reducing interference from the diffuser 33 with the electrostatic field radiated by the electrode needle 4.

[0053] In order to make the powder spread into an ideal cloud-like spray, the angle θ between the line connecting the outer end of the diffusion part 33 and the center point of the initial surface of the connecting part 34 and the center line is 17° - 24.5°, and the preferred angle θ is 20°. Within this range, the air flow can stably spread into a cloud-like spray along the diffusion part 33. As Figure 7 shown, the angle θ of the scattering head 3 is 17°, the outward diffusion angle is relatively flat, and the diffusion area is small; as Figure 8 shown, the angle θ of the scattering head 3 is 24.5°, the outward diffusion angle is steeper, and the diffusion area is larger.

[0054] In order to make the powder spread into an ideal cloud-like spray, the distance L between the diffusion part 33 and the nozzle 21 is 20 mm - 24 mm, and the preferred distance L is 22 mm. Within this range, not only can the air flow carry the powder and flow smoothly out of the nozzle 21, preventing the air flow from moving around after exiting the nozzle 21 and causing air flow disorder, but also the horizontal air flow coming out of the nozzle 21 can be guided into a cloud-like spray that diffuses around within a short distance, and the gap between the diffusion part 33 and the nozzle 21 can accommodate a finger to enter, facilitating the extraction of the scattering head 3.

[0055] To improve portability, a powder cup 5 is provided below the barrel 12, and the powder cup 5 is detachably connected to the barrel 12; the opening of the powder cup 5 faces upward. The powder cup 5 is used for placing the powder. The detachable design facilitates the disassembly of the powder cup 5 for powder loading. Moreover, since the powder cup 5 is located below, it is convenient for the installation of the powder cup 5. At the same time, with the opening of the powder cup 5 facing upward, there is no risk of powder pouring out.

[0056] To improve portability, a battery pack 6 is provided below the handle 13, and the battery pack 6 is detachably connected to the handle 13. The detachable design of the battery pack 6 facilitates battery replacement by disassembling and assembling the battery pack 6, extends the usage time, improves work efficiency, and enables the charging of the battery pack 6 to be separated from the electrostatic powder sprayer. Also, since the battery pack 6 is located below, it is convenient for the disassembly and assembly of the battery pack 6.

[0057] The electrostatic powder sprayer does not require an external power supply and external powder supply, making it convenient to carry. Both the powder cup 5 and the battery pack 6 are located below, causing the weight to be concentrated at the lower part. The electrostatic powder sprayer stands more stably when placed upright. The powder cup 5 can serve as the second support point for upright placement, and can also be used for gripping at the powder cup 5 when necessary, with higher practicality.

[0058] A downward-extending connecting section 121 is provided on the barrel 12, and the connecting section 121 is detachably connected to the powder cup 5 by a thread. The design of the connecting section 121 can not only keep a certain distance between the powder cup 5 and the barrel 12 for convenient installation of the powder cup 5, but also lower the height of the powder cup 5 to facilitate the bottom surface of the powder cup 5 and the bottom surface of the battery pack 6 to be on the same plane.

[0059] A platform 131 is provided at the bottom of the handle 13, and the upper surface of the battery pack 6 is attached to the bottom surface of the platform 131. The design of the platform 131 makes the bottom of the handle 13 have a relatively large flat surface without affecting the grip on the upper part of the handle 13. At the same time, when the user holds it, the upper part of the handle 13 is blocked by the barrel 12, and the lower part of the handle 13 is blocked by the platform 131, which can prevent the user from slipping out of the handle 13 when holding it. The platform 131 expands the area of the bottom of the handle 13, that is, after the battery pack 6 is removed, the electrostatic powder sprayer can be stably placed on a flat surface through the platform 131, so as to facilitate the stable placement of the electrostatic powder sprayer after the battery pack 6 is removed; the contact area between the upper surface of the battery pack 6 and the bottom surface of the platform 131 is large. In the placement state of the electrostatic powder sprayer, the force can be dispersed and transmitted to the battery pack 6, which can reduce the force at the connection between the battery pack 6 and the handle 13.

[0060] To ensure reliable installation of the battery pack 6, an inwardly recessed installation groove 132 is provided on the bottom surface of the platform 131, and an upwardly protruding installation portion 61 is provided on the battery pack 6. The installation portion 61 cooperates with the installation groove 132, which can enable the battery pack 6 to be accurately installed. At the same time, after the installation portion 61 enters the installation groove 132, it can also prevent the battery pack 6 from displacing in the horizontal plane direction relative to the handle 13, that is, it can prevent shaking.

[0061] In this embodiment, the contacts of the battery pack 6 are arranged at the top of the installation portion 61, and the corresponding contacts on the handle 13 are arranged at the bottom of the installation groove 132, which provides good protection for the contacts and is not easy to get water in.

[0062] To ensure reliable placement of the electrostatic powder sprayer, the bottom surface of the battery pack 6 and the bottom surface of the powder cup 5 are on the same plane, that is, the electrostatic powder sprayer can be stably placed on a flat surface through the bottom surface of the battery pack 6 and the bottom surface of the powder cup 5.

[0063] To facilitate the grip of the electrostatic powder sprayer, the high-voltage module 8, the blower 7, the handle 13 and the battery pack 6 are on the same straight line, which makes the weight mainly concentrated on the straight line where the handle 13 is located, facilitating the user to hold it through the handle 13. When the user holds it, the force of outward turning is less, which can reduce the fatigue of the wrist.

[0064] To facilitate the adjustment of powder output, a knob 122 for output adjustment is provided on the side surface of the barrel 12. The knob 122 is arranged on the side, which is convenient for the user to operate. By the knob 122, the speed of the blower 7 can be steplessly adjusted, and thus the powder output can be steplessly adjusted.

[0065] A power switch 9 for the blower 7 and the high-voltage module 8 is provided on the handle 13, and the battery pack 6 is electrically connected to the blower 7 and the high-voltage module 8.

[0066] For reliable air intake, a fan 7 is further included. The fan 7 is located inside the air duct assembly 2, and the fan 7 is used to convey air flow to the air duct assembly 2. The air duct assembly 2 further includes an adapter 22 and an air inlet pipe 23. The two ends of the adapter 22 are respectively connected to the nozzle 21 and the air inlet pipe 23. A notch 11 is formed in the tail of the gun barrel 12, and the air inlet pipe 23 communicates with the notch 11. A filter screen 111 is provided on the notch 11, and a filter sheet 112 is provided between the filter screen 111 and the air inlet pipe 23. The air inlet pipe 23 communicates with the outside, facilitating the fan 7 to suck air. The adapter 22 is used to connect the powder cup 5, the air inlet pipe 23 and the nozzle 21. The filter screen 111 can block impurities from entering the interior along with the gas, and the filter sheet 112 can further purify the entering gas.

[0067] To ensure the reliability of the adapter 22, the adapter 22 includes an air duct inlet pipe 221, a powder cup inlet pipe 222, a powder cup outlet pipe 223 and an air duct outlet pipe 224. The two ends of the air duct inlet pipe 221 are respectively connected to the air inlet pipe 23 and the powder cup inlet pipe 222. The two ends of the air duct outlet pipe 224 are respectively connected to the nozzle 21 and the powder cup outlet pipe 223. Both the powder cup inlet pipe 222 and the powder cup outlet pipe 223 are connected to the powder cup 5. The outlet end of the powder cup inlet pipe 222 is close to the bottom of the powder cup 5, and the inlet end of the powder cup outlet pipe 223 is close to the top of the powder cup 5. The gas enters from the bottom and exits from the top, which is more conducive to driving the powder and can blow up the powder at the bottom. The air duct inlet pipe 221 is used to guide the air flow to enter, the powder cup inlet pipe 222 is used to introduce the air flow in the air duct inlet pipe 221 into the powder cup 5, the powder cup outlet pipe 223 is used to introduce the air flow in the powder cup 5 into the air duct outlet pipe 224, and the air duct outlet pipe 224 is used to guide the air flow to flow out, so that the air flow can stably enter the powder cup 5 and drive the powder in the powder cup 5 to leave the powder cup 5.

[0068] The axis of the air duct inlet pipe 221 is on the same straight line as the axis at the outlet of the air inlet pipe 23, and the gas flowing out of the air inlet pipe 23 can stably enter the air duct inlet pipe 221. The axis of the air duct outlet pipe 224 is on the same straight line as the axis of the nozzle 21, and the gas flowing out of the air duct outlet pipe 224 can stably enter the nozzle 21. The adapter 22 is integrally in a T shape and has a compact structure.

[0069] In this embodiment, the axis of the air duct inlet pipe 221 is perpendicular to the axis of the powder cup inlet pipe 222, and the axis of the powder cup outlet pipe 223 is perpendicular to the axis of the air duct outlet pipe 224. The axis of the air duct inlet pipe 221 is on the same straight line as the axis of the air duct outlet pipe 224. The axis of the powder cup inlet pipe 222 and the axis of the powder cup outlet pipe 223 are in the same plane and parallel to each other.

[0070] To ensure smooth gas flow, there is an arc transition between the air duct inlet pipe 221 and the powder cup inlet pipe 222, and an arc transition between the air duct outlet pipe 224 and the powder cup outlet pipe 223. That is, a first arc surface 2211 is provided between the air duct inlet pipe 221 and the powder cup inlet pipe 222. The first arc surface 2211 is located outside the intersection of the air duct inlet pipe 221 and the powder cup inlet pipe 222. When the incoming air of the air duct inlet pipe 221 enters the powder cup inlet pipe 222, it mainly impacts the outer side surface. The design of the first arc surface 2211 can effectively guide the incoming air, reduce the resistance during gas flow, and reduce excessive wind pressure attenuation. Of course, the first arc surface 2211 can also be extended to the entire connection; a second arc surface 2241 is provided between the air duct outlet pipe 224 and the powder cup outlet pipe 223. The second arc surface 2241 is located outside the intersection of the air duct outlet pipe 224 and the powder cup outlet pipe 223. When the outgoing air of the powder cup outlet pipe 223 enters the air duct outlet pipe 224, it mainly impacts the outer side surface. The design of the second arc surface 2241 can effectively guide the incoming air, reduce the resistance during gas flow, and reduce excessive wind pressure attenuation. Of course, the second arc surface 2241 can also be extended to the entire connection.

[0071] To improve the fluidization effect of the powder, at least two powder blowing ports 2221 are provided at the air outlet end of the powder cup inlet pipe 222, and the powder blowing ports 2221 are arranged along the radial direction of the powder cup inlet pipe 222; a baffle 225 is provided at the air outlet end of the powder cup inlet pipe 222, and the powder blowing ports 2221 are located between the baffle 225 and the air outlet end of the powder cup inlet pipe 222. The design of multiple powder blowing ports 2221 realizes multi-directional air outlet, has a better blowing effect on the powder, and can make the powder float more evenly; the design of the baffle 225 can block the air flow, so that the air flow coming out of the powder cup inlet pipe 222 is blocked and then moves towards the radially arranged powder blowing ports 2221. At the same time, the baffle 225 can block the powder from entering the powder cup inlet pipe 222 and prevent the powder from entering and blocking the powder cup inlet pipe 222.

[0072] In this embodiment, the four sides of the baffle 225 extend upward to form a mounting sleeve 226. The mounting sleeve 226 is sleeved on the outlet end of the powder cup inlet pipe 222, and the powder blowing ports 2221 are arranged on the mounting sleeve 226.

[0073] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form an equivalent embodiment with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An electrostatic powder sprayer, characterized in that, including a gun body (1); a high-voltage module (8) for generating high-voltage static electricity; an air duct assembly (2) for guiding gas flow; a scattering head (3) for powder diffusion; electrode needles (4) electrically connected to the high-voltage module (8); the air duct assembly (2) includes a nozzle (21), the nozzle (21) is provided with a first channel (211) and a positioning post (212) coaxial with the first channel (211), one end of the positioning post (212) facing the scattering head (3) is provided with a step (2121) and a first through hole (2122), a first groove (213) is provided on the outer surface of the nozzle (21), the first through hole (2122) communicates with the first groove (213), the scattering head (3) is detachably sleeved on the step (2121) through a second through hole (31), and the electrode needles (4) are inserted through the first through hole (2122) and the second through hole (31), and both ends of the electrode needles (4) respectively penetrate out of the second through hole (31) and the first groove (213).

2. The electrostatic powder sprayer according to claim 1, wherein: a connecting housing (214) is provided on the nozzle (21), the first groove (213) is arranged on the connecting housing (214), and one end of the positioning post (212) is connected to the connecting housing (214); the side of the connecting housing (214) away from the scattering head (3) is a first arc surface (2141) or a first inclined surface; a first flow guiding structure (2142) is provided on the side of the connecting housing (214) away from the scattering head (3).

3. The electrostatic powder sprayer according to claim 1, characterized in that: the nozzle (21) includes a connecting pipe body (215) and a first pipe body (216) and a second pipe body (217) located at both ends of the connecting pipe body (215), the first groove (213) is located on the connecting pipe body (215), the cross-sectional area of the connecting pipe body (215) gradually decreases from the side away from the scattering head (3) to the side close to the scattering head (3); the diameter of the first pipe body (216) is smaller than the diameter of the second pipe body (217), and the positioning post (212) is located inside the first pipe body (216).

4. An electrostatic powder sprayer according to claim 1, characterized in that: the center line of the second through hole (31) coincides with the center line of the scattering head (3); the second through hole (31) includes a cylindrical portion (311) and a conical portion (312), one end of the cylindrical portion (311) is sleeved on the step (2121), the other end of the cylindrical portion (311) is connected to one end of the conical portion (312), and the cross-sectional area of the conical portion (312) gradually decreases from the side close to the cylindrical portion (311) to the side away from the cylindrical portion (311).

5. An electrostatic powder sprayer according to claim 1, characterized in that: the connection between the scattering head (3) and the positioning post (212) has a smooth transition; the scattering head (3) is in a trumpet shape; a convex block (32) is provided on the side of the scattering head (3) away from the positioning post (212), and the side of the convex block (32) away from the positioning post (212) is conical; the electrode needles (4) are inserted through the convex block (32).

6. The electrostatic powder sprayer according to claim 1, characterized in that: a powder cup (5) and a battery pack (6) are provided below the gun body (1), and both the powder cup (5) and the battery pack (6) are detachably connected to the gun body (1).

7. An electrostatic powder sprayer according to claim 6, characterized in that: It further includes a fan (7), and the fan (7) is located inside the air duct assembly (2); the air duct assembly (2) further includes an adapter (22) and an air inlet pipe (23). The two ends of the adapter (22) are respectively connected to the spray pipe (21) and the air inlet pipe (23). A notch (11) is formed on the gun body (1), and the air inlet pipe (23) is communicated with the notch (11). A filter net (111) is provided on the notch (11), and a filter sheet (112) is provided between the filter net (111) and the air inlet pipe (23).

8. An electrostatic powder sprayer according to claim 7, characterized in that: The adapter (22) includes an air duct inlet pipe (221), a powder cup inlet pipe (222), a powder cup outlet pipe (223) and an air duct outlet pipe (224). The two ends of the air duct inlet pipe (221) are respectively communicated with the air inlet pipe (23) and the powder cup inlet pipe (222). The two ends of the air duct outlet pipe (224) are respectively communicated with the spray pipe (21) and the powder cup outlet pipe (223). Both the powder cup inlet pipe (222) and the powder cup outlet pipe (223) are communicated with the powder cup (5).

9. An electrostatic powder sprayer according to claim 8, characterized in that: An arc transition is provided between the air duct inlet pipe (221) and the powder cup inlet pipe (222), and an arc transition is provided between the air duct outlet pipe (224) and the powder cup outlet pipe (223).

10. An electrostatic powder sprayer according to claim 8, characterized in that: At least two powder blowing ports (2221) are provided at the air outlet end of the powder cup inlet pipe (222), and the powder blowing ports (2221) are arranged along the radial direction of the powder cup inlet pipe (222); a baffle (225) is provided at the air outlet end of the powder cup inlet pipe (222), and the powder blowing ports (2221) are located between the baffle (225) and the air outlet end of the powder cup inlet pipe (222).

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