Air inlet mechanism of electrostatic powder spray gun

Abstract

The utility model relates to the technical field of electrostatic powder spray guns, in particular to an air inlet mechanism of an electrostatic powder spray gun, which comprises a first air supply pipeline, a second air supply pipeline, a third air supply pipeline, a fourth air supply pipeline and a fifth air supply pipeline, one end of the second air supply pipeline detachably sleeves the inner concave structure, and the other end of the second air supply pipeline is used for being connected with a powder supply mechanism; wherein a fan used for generating airflow is detachably arranged in the first air supply pipeline, and the second air supply pipeline is used for conveying the airflow generated by the fan to the powder supply mechanism; the first air supply pipeline is detachably connected with the second air supply pipeline, and the first air supply pipeline is detachably connected with the fan, so that the first air supply pipeline, the second air supply pipeline and the fan are convenient to replace and maintain, and the interiors of the first air supply pipeline and the second air supply pipeline are convenient to clean.

Description

Technical Field

[0001] This disclosure relates to the field of electrostatic powder spray gun technology, and in particular to an air inlet mechanism for an electrostatic powder spray gun. Background Technology

[0002] An electrostatic powder spray gun typically includes a gun body, nozzle, electrodes, powder supply mechanism, fan, control system, and high-voltage power supply. The high-voltage power supply provides high voltage to the electrodes, creating a strong electrostatic field around them. Simultaneously, the fan starts, generating a high-speed airflow, creating a pressure difference in the powder supply mechanism, which then transports the powder through a powder delivery pipe to the nozzle in the gun body. When the powder passes through the nozzle, the powder particles become electrostatically charged due to the electrostatic field generated by the electrodes. The charged powder is then ejected from the nozzle under the influence of the high-speed airflow, forming an atomized powder stream. Because the workpiece is grounded, the charged powder particles are attracted to the workpiece surface by electrostatic attraction, forming a uniform powder coating. As powder is continuously sprayed onto the workpiece surface, the coating gradually thickens until the desired thickness is reached, at which point spraying stops. Finally, a curing process is performed to solidify the powder coating into a hard, wear-resistant, and corrosion-resistant protective film, completing the entire spraying process.

[0003] Utility model patent with patent number 2020218574868 discloses an electrostatic powder spray gun, including a gun barrel. A partition plate is provided inside the gun barrel, dividing the inner cavity of the gun barrel into a powder spraying chamber and an instrument chamber. The bottom of the instrument chamber is connected to a handle fixing tube, and a handle is hinged to the outside of the handle fixing tube. A high-voltage discharge device is installed inside the instrument chamber. The high-voltage discharge device is connected to a power interface through a wire, and a touch switch is provided on the wire. A spring is provided inside the handle to trigger the touch switch. A protective tube is provided inside the powder spraying chamber, and a discharge needle is provided inside the protective tube. The discharge needle is connected to the high-voltage discharge device through a high-voltage wire. A powder high-voltage pipe is connected to the bottom of the powder spraying chamber. An annular cleaning plate is provided outside the protective tube inside the powder spraying chamber. Cleaning bristles are provided on both the inner and outer rings of the annular cleaning plate. An operating rod is connected to one end of the annular cleaning plate, and the operating rod extends out of the gun barrel.

[0004] The aforementioned patent uses a powder high-pressure tube to transport powder. Since the powder high-pressure tube involves the transmission of high-voltage electricity, it usually has a complex structure with electrodes, insulating materials, etc., which makes regular maintenance and cleaning extremely inconvenient. Utility Model Content

[0005] In view of the shortcomings or problems existing in the prior art, this disclosure provides an air inlet mechanism for an electrostatic powder spray gun, which has a stable structure and reliable operation.

[0006] The technical solution adopted by this disclosure to solve the above-mentioned technical problem is: an air inlet mechanism for an electrostatic powder spray gun, comprising:

[0007] The first air supply duct has a recessed structure at one end and a filter component at the other end.

[0008] The second air supply duct has one end detachably fitted onto the outside of the concave structure, and the other end is used to connect to the powder supply mechanism.

[0009] The first air supply duct is detachably equipped with a fan for generating airflow, and the second air supply duct is used to transport the airflow generated by the fan to the powder supply mechanism.

[0010] In a preferred embodiment, one end of the second air supply duct is provided with an outward expansion structure, which is located outside the concave structure.

[0011] The expansion structure is located at the junction of the first and second air supply ducts. This increases the contact area between them, resulting in more even stress distribution. It also enhances the smoothness of airflow transition, reducing turbulence and energy loss, thereby improving airflow delivery efficiency. Furthermore, the expansion structure provides elasticity and cushioning, absorbing vibrations generated during spray gun operation to some extent. This reduces the impact of vibrations on the junction of the first and second air supply ducts, preventing loosening due to long-term vibration and ensuring the normal operation of the air intake mechanism.

[0012] In a preferred embodiment, the outward expansion structure is located at the lower edge of the second air supply duct, and the outward expansion structure is an arc-shaped curved surface extending outward from the lower edge of the second air supply duct.

[0013] The outward expansion structure allows the airflow to gradually diffuse in the second air supply duct, making the airflow velocity distribution more uniform and preventing the airflow velocity from being too high or too low in local areas. This ensures that the airflow is evenly delivered to the powder supply mechanism, helps stabilize the power of powder delivery, and enables the powder to be delivered to the nozzle of the spray gun at a stable speed and flow rate, thereby improving the uniformity and consistency of the spraying.

[0014] In a preferred embodiment, the filter assembly includes a filter screen and a filter sheet, the filter screen being provided with a limiting groove, the shape of the filter sheet being adapted to the limiting groove, and the filter sheet being nested in the limiting groove.

[0015] In some embodiments, a first air inlet is provided at the end of the first air supply duct away from the second air supply duct, and the filter assembly is located at the first air inlet.

[0016] In some embodiments, the system further includes a housing, with the first and second air supply ducts disposed inside the housing, the housing having a second air inlet, the first air supply duct being disposed near the second air inlet, and the filter assembly being disposed at the second air inlet.

[0017] In a preferred embodiment, the first air supply duct includes a first connecting shell and a second connecting shell that can be detachably connected. The first connecting shell has a first splicing surface on both sides, and the second connecting shell has a second splicing surface on both sides. The first connecting shell and the second connecting shell are spliced ​​together through the first splicing surface and the second splicing surface to form the first air supply duct.

[0018] In a preferred embodiment, the first splicing surface is provided with a strip-shaped protrusion along its length direction, and the second splicing surface is provided with a strip-shaped concave side along its length direction, wherein the strip-shaped protrusion is located in the strip-shaped concave side.

[0019] The combination of the convex and concave strips provides positioning and guidance for installation; the convex strips are embedded in the concave strips, increasing the contact area at the joint of the first and second connecting shells, improving the sealing of the first air supply duct, which can not only effectively prevent air leakage and improve the air supply efficiency of the air supply duct, but also prevent dust and other impurities from entering.

[0020] In a preferred embodiment, the inner wall of the first air supply duct is provided with a first protrusion structure, and the outer casing of the fan is in contact with the first protrusion structure.

[0021] When the fan is working, it will inevitably vibrate. The support point formed by the first protrusion structure contacting the fan casing can effectively limit the displacement of the fan in the first air supply duct, preventing it from shifting position due to vibration and affecting the air supply effect.

[0022] In a preferred embodiment, the outer wall of the first air supply duct is provided with a second protrusion structure, and the housing is provided with a groove. The second protrusion structure cooperates with the groove to connect the first air supply duct to the housing.

[0023] Compared to existing products:

[0024] In this application, the fan is installed in the first air supply duct to generate a stable airflow in the first channel. The second air supply duct is installed between the first channel and the powder supply mechanism to transport the airflow from the first channel to the powder supply mechanism. The concave structure makes the inner walls of the first and second air supply ducts flush after they are connected, so that the airflow can smoothly transition from the first air supply duct to the second air supply duct, reducing airflow turbulence and energy loss, ensuring that the airflow flows efficiently to the powder supply mechanism, and providing a stable driving force for powder conveying.

[0025] The detachable connection between the first air supply duct and the second air supply duct, and the detachable connection between the first air supply duct and the fan, not only facilitates the replacement and maintenance of the first air supply duct, the second air supply duct, and the fan, but also facilitates the cleaning of the inside of the first air supply duct and the second air supply duct.

[0026] By placing the filter assembly at the end furthest from the second air supply duct, the filter assembly can effectively intercept dust, impurities, and other particles in the outside air, preventing them from entering the interior of the first air supply duct, avoiding wear on the fan, and extending the service life of the fan; more importantly, it can effectively prevent impurities from mixing into the powder and affecting the coating quality. Attached Figure Description

[0027] The present application will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the present application. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0028] Figure 1 This is one of the structural schematic diagrams of the air inlet mechanism of an electrostatic powder spray gun disclosed herein;

[0029] Figure 2 This is a cross-sectional view of the air inlet mechanism of an electrostatic powder spray gun disclosed herein;

[0030] Figure 3 This is a schematic diagram of the structure of the second air supply duct disclosed herein;

[0031] Figure 4 This is a schematic diagram of the structure of the first air supply duct disclosed in this publication;

[0032] Figure 5 This is a schematic diagram of the structure of the first connecting shell disclosed herein;

[0033] Figure 6 This is a schematic diagram of the structure of the second connecting shell of this disclosure;

[0034] Figure 7 This is the second schematic diagram of the air inlet mechanism of an electrostatic powder spray gun disclosed herein;

[0035] Figure 8 This is a schematic diagram of the air intake mechanism used in the spray gun disclosed herein;

[0036] Figure 9 This is a schematic diagram of the structure of the filtering component disclosed herein;

[0037] Figure 10 This is an exploded view of the filtering component disclosed in this publication.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. First air supply duct; 2. Second air supply duct; 3. Recessed structure; 5. Filter assembly; 6. Filter screen; 7. Filter disc; 8. Fan; 9. First air inlet; 10. Expanding structure; 11. First protruding structure; 12. Second protruding structure; 13. First connecting shell; 14. Strip-shaped protrusion; 15. Second connecting shell; 16. Strip-shaped concave; 17. Shell; 18. Powder supply mechanism; 19. Hollowed-out part; 20. Annular snap-fit ​​part; 21. Annular protrusion. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0041] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0042] Please refer to Figures 1-4As shown, this application provides an air inlet mechanism for an electrostatic powder spray gun, including a first air supply pipe 1 and a second air supply pipe 2. One end of the first air supply pipe 1 is provided with a concave structure 3, and the other end is provided with a filter assembly 5. One end of the second air supply pipe 2 is detachably sleeved on the outside of the concave structure 3, and the other end is used to connect to a powder supply mechanism 18. The first air supply pipe 1 is detachably provided with a fan 8 for generating airflow, and the second air supply pipe 2 is used to transport the airflow generated by the fan 8 to the powder supply mechanism 18. With the above structural arrangement, the fan 8 generates a stable airflow in the first channel. The second air supply duct 2 is located between the first channel and the powder supply mechanism 18, used to transport the airflow from the first channel to the powder supply mechanism 18. The concave structure 3 ensures that the inner walls of the first air supply duct 1 and the second air supply duct 2 are flush after they are connected, thus allowing the airflow to smoothly transition from the first air supply duct 1 to the second air supply duct 2, reducing airflow turbulence and energy loss, ensuring that the airflow flows efficiently to the powder supply mechanism 18, and providing a stable driving force for powder conveying. The first air supply duct 1 and the second air supply duct 2 are detachably connected, and the first air supply duct 1 is detachably connected to the fan 8. This design not only facilitates the replacement and maintenance of the first air supply duct 1, the second air supply duct 2, and the fan 8, but also makes cleaning of the interior of the first air supply duct 1 and the second air supply duct 2 easier. Furthermore, since there is no high-voltage electricity transmission in the first air supply duct 1 and the second air supply duct 2, maintenance and cleaning are safer. By placing the filter assembly 5 at the end furthest from the second air supply duct 2, the filter assembly 5 can effectively intercept dust, impurities, and other particles from the outside air, preventing them from entering the interior of the first air supply duct 1, avoiding wear on the fan 8, and extending the service life of the fan 8. More importantly, it can effectively prevent impurities from mixing into the powder and affecting the coating quality.

[0043] Furthermore, one end of the second air supply duct 2 is provided with an outward expansion structure 10, which is located outside the concave structure 3. Specifically, the outward expansion structure 10 is located at the lower edge of the second air supply duct 2, and is an arc-shaped curved surface extending outward from the lower edge of the second air supply duct 2. Placing the outward expansion structure 10 at the junction of the first air supply duct 1 and the second air supply duct 2 increases the contact area at the connection point, making the stress at the connection point more uniform; it also enhances the smoothness of airflow transition, reduces turbulence and energy loss, thereby improving airflow delivery efficiency.

[0044] Furthermore, the outward expansion structure 10 has a certain degree of elasticity and buffering effect, which can absorb the vibration generated during the operation of the spray gun to a certain extent, thereby reducing the impact of vibration on the connection between the first air supply duct 1 and the second air supply duct 2, preventing loosening of the connection due to long-term vibration, and ensuring the normal operation of the air intake mechanism 8. On the other hand, the outward expansion structure 10 can allow the airflow to gradually diffuse in the second air supply duct 2, making the airflow velocity distribution more uniform, preventing the airflow velocity from being too high or too low in a local area, ensuring that the airflow is uniformly delivered to the powder supply mechanism 18, helping to stabilize the power of powder delivery, so that the powder can be delivered to the nozzle of the spray gun at a stable speed and flow rate, thereby improving the uniformity and consistency of spraying.

[0045] The first air supply duct 1 and the second air supply duct 2 can be connected by plugging. In order to strengthen the connection between the first air supply duct 1 and the second air supply duct 2, the outer wall of the concave structure 3 is provided with several protrusions. The first air supply duct 1 and the second air supply duct 2 are both made of plastic and can undergo a certain degree of elastic deformation. The protrusions make the connection between the two more stable.

[0046] The first air supply duct 1 and the second air supply duct 2 can be connected together by a threaded connection. Specifically, the outer peripheral wall of the concave structure 3 is provided with an external thread, and the inner peripheral wall of the expanding structure 10 is provided with an internal thread, with the external thread engaging with the internal thread. Of course, the first air supply duct 1 and the second air supply duct 2 can also be connected by a snap-fit ​​connection. This application does not limit the specific connection method between the first air supply duct 1 and the second air supply duct 2, as long as it can be detachable.

[0047] Please refer to Figure 9 and Figure 10 As shown, in one embodiment of this disclosure, the filter assembly 5 includes a filter screen 6 and a filter element 7. The filter screen 6 is provided with a limiting groove, and the shape of the filter element 7 is adapted to the limiting groove, with the filter element 7 nested in the limiting groove. Specifically, the filter screen 6 is generally disc-shaped, with a hollow portion 19 in the middle, and an annular snap-fit ​​portion 20 is provided around the hollow portion 19. The annular snap-fit ​​portion 20 is used to snap into the first air supply duct 1 or the housing 17. The limiting groove is an annular protrusion 21 vertically provided on the annular snap-fit ​​portion 20, and the filter element 7 is positioned opposite the hollow portion 19. The filter element 7 has a circular structure and is made of sponge material, which can deform to a certain extent. The size of the filter element 7 in its normal state is slightly larger than the size of the limiting groove. After being nested in the limiting groove, the edge of the filter element 7 can fit tightly against the inner wall of the limiting groove, thereby making the connection between the filter element 7 and the filter screen 6 more secure. The above-described connection method of the filter screen 6 and the filter element 7 facilitates regular maintenance and replacement.

[0048] When air passes through the filter assembly 5, the filter screen 6 first intercepts larger particulate impurities, and then the filter plate 7 further filters smaller particles and impurities that may pass through the filter screen 6. This multi-stage filtration method can significantly improve filtration efficiency and filtration quality, thereby ensuring the cleanliness of the gas entering the first air supply duct 1.

[0049] In some embodiments, a first air inlet 9 is provided at the end of the first air supply duct 1 away from the second air supply duct 2, and a filter assembly 5 is provided at the first air inlet 9.

[0050] like Figure 7 and Figure 8 As shown, in some embodiments, the housing 17 is also included, the first air supply duct 1 and the second air supply duct 2 are disposed inside the housing 17, the housing 17 is provided with a second air inlet, the first air supply duct 1 is disposed near the second air inlet, and the filter assembly 5 is disposed at the second air inlet.

[0051] like Figures 4-6 As shown, the first air supply duct 1 includes a first connecting shell 13 and a second connecting shell 15 connected by bolts. The first connecting shell 13 has a first splicing surface on both sides, and the second connecting shell 15 has a second splicing surface on both sides. The first connecting shell 13 and the second connecting shell 15 are joined together through the first splicing surface and the second splicing surface to form the first air supply duct 1. The second air supply duct 2 is integrally formed.

[0052] Preferably, the first splicing surface is provided with a strip-shaped protrusion 14 along its length, and the second splicing surface is provided with a strip-shaped concave section 16 along its length, with the strip-shaped protrusion 14 located within the strip-shaped concave section 16. The matching method of the strip-shaped protrusion 14 and the strip-shaped concave section 16 provides positioning and guidance for installation; the strip-shaped protrusion 14 embedded in the strip-shaped concave section 16 increases the contact area at the splice of the first connecting shell 13 and the second connecting shell 15, improving the sealing performance of the first air supply duct 1. This not only effectively prevents air leakage and improves the air supply efficiency of the air supply duct, but also prevents the entry of dust and other impurities.

[0053] The inner wall of the first air supply duct 1 is provided with a first protruding structure 11, and the outer casing of the fan 8 contacts the first protruding structure 11. Specifically, the first protruding structure 11 consists of several protruding strips or blocks. When the fan 8 is working, it will inevitably vibrate. The support point formed by the contact between the first protruding structure 11 and the outer casing of the fan 8 can effectively limit the displacement of the fan 8 within the first air supply duct 1, preventing it from shifting its position due to vibration and affecting the air supply effect.

[0054] The outer wall of the first air supply duct 1 is provided with a second protruding structure 12, and the housing 17 is provided with a groove. The second protruding structure 12 cooperates with the groove to connect the first air supply duct 1 to the housing 17. Specifically, the second protruding structure 12 is a raised strip. The second protruding structure 12 and the groove provide a clear positioning reference for the connection between the first air supply duct 1 and the housing 17, thereby achieving a quick connection. Through the tight fit between the second protruding structure 12 and the groove, vibration energy is absorbed and dispersed, reducing the risk of loosening of the connection due to vibration, thereby improving the stability and reliability of the entire system.

[0055] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An air inlet mechanism for an electrostatic powder spray gun, characterized in that, include: The first air supply duct (1) has a concave structure (3) at one end and a filter assembly (5) at the other end. The second air supply duct (2) has one end detachably fitted onto the outside of the concave structure (3), and the other end is used to connect to the powder supply mechanism (18). The first air supply duct (1) is detachably equipped with a fan (8) for generating airflow, and the second air supply duct (2) is used to transport the airflow generated by the fan (8) to the powder supply mechanism (18).

2. The air inlet mechanism of the electrostatic powder spray gun according to claim 1, characterized in that, One end of the second air supply duct (2) is provided with an expansion structure (10), which is located outside the concave structure (3).

3. The air inlet mechanism of the electrostatic powder spray gun according to claim 2, characterized in that, The outward expansion structure (10) is located at the lower edge of the second air supply duct (2), and the outward expansion structure (10) is an arc-shaped curved surface extending outward from the lower edge of the second air supply duct (2).

4. The air inlet mechanism of the electrostatic powder spray gun according to claim 1, characterized in that, The filter assembly (5) includes a filter screen (6) and a filter sheet (7). The filter screen (6) is provided with a limiting groove. The shape of the filter sheet (7) is adapted to the limiting groove, and the filter sheet (7) is nested in the limiting groove.

5. The air inlet mechanism of the electrostatic powder spray gun according to claim 4, characterized in that, The first air supply duct (1) is provided with a first air inlet (9) at the end away from the second air supply duct (2), and the filter assembly (5) is provided at the first air inlet (9).

6. The air inlet mechanism of the electrostatic powder spray gun according to claim 4, characterized in that, It also includes a housing (17), a first air supply duct (1) and a second air supply duct (2) disposed inside the housing (17), the housing (17) is provided with a second air inlet, the first air supply duct (1) is disposed near the second air inlet, and the filter assembly (5) is disposed at the second air inlet.

7. The air inlet mechanism of the electrostatic powder spray gun according to claim 1, characterized in that, The first air supply duct (1) includes a first connecting shell (13) and a second connecting shell (15) that can be detachably connected. The first connecting shell (13) has a first splicing surface on both sides, and the second connecting shell (15) has a second splicing surface on both sides. The first connecting shell (13) and the second connecting shell (15) are spliced ​​together through the first splicing surface and the second splicing surface to form the first air supply duct (1).

8. The air inlet mechanism of the electrostatic powder spray gun according to claim 7, characterized in that, The first splicing surface is provided with a strip-shaped protrusion (14) along its length direction, and the second splicing surface is provided with a strip-shaped concave (16) along its length direction, wherein the strip-shaped protrusion (14) is located in the strip-shaped concave (16).

9. The air inlet mechanism of the electrostatic powder spray gun according to claim 1, characterized in that, The inner wall of the first air supply duct (1) is provided with a first protrusion structure (11), and the outer shell of the fan (8) is in contact with the first protrusion structure (11).

10. The air inlet mechanism of the electrostatic powder spray gun according to claim 6, characterized in that, The outer wall of the first air supply duct (1) is provided with a second protrusion structure (12), and the shell (17) is provided with a groove. The second protrusion structure (12) cooperates with the groove to connect the first air supply duct (1) and the shell (17).

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