Pneumatic high-speed rotating cup type electrostatic spraying nozzle

Abstract

The invention discloses a pneumatic high-speed rotating cup type electrostatic spraying nozzle which comprises a base, a rotating shaft, a nozzle body, a shell, a former, a connector, a liquid distribution disc, a rotating cup, a first fastener, a second fastener, a third fastener and a bearing. By the adoption of the technical scheme, the sprayed liquid spray material has the advantages of being corrosive, large in single-time coating coverage area, free of a liquid storage closed-loop circulation area inside, convenient to replace the spray head, sufficient in coating atomization and high in utilization rate.

Description

Technical Field

[0001] The present application relates to the technical field of electrostatic spraying, and in particular to a pneumatic high-speed rotary cup electrostatic spraying nozzle. Background Art

[0002] Electrostatic spraying is when the spray gun is spraying, under the action of the voltage of the high-voltage power supply, an electrostatic field with opposite charges is formed between the spray cup, the coating liquid and the workpiece to be coated. The spray gun's bell is driven by a pneumatic motor. When the paint is sent to the high-speed rotating bell of the spray gun, it obtains a huge acceleration and moves toward the edge of the bell. Under the dual action of centrifugal force and strong electric field, it is formed into extremely fine charged particles, which move toward the surface of the workpiece with opposite polarity and are deposited on the surface of the sprayed workpiece to form a uniform coating.

[0003] At present, electrostatic spraying technology has been widely used in the industry of spraying water paint or powder. However, in some special industries, the liquid coatings sprayed contain corrosive acidic media or precious metal ions. General-purpose nozzles and spray guns cannot meet the requirements of corrosion resistance. At the same time, due to the complexity of the assembled workpieces, there will be liquid accumulation in the gaps between parts, which aggravates the corrosion of the workpieces, shortens the service life of nozzles or spray guns, and makes the replacement cost too high.

[0004] Moreover, the precious metal ions contained in the paint have high requirements on the utilization rate of the paint. The utilization rate of ordinary paint is 85% to 90%. The high-voltage static loss is large, and the paint loss is large, which cannot meet the requirements of use.

[0005] In addition, with the existing rotary cup electrostatic spraying, when the coating area is large or the shape is complex, the coverage area of ​​the ordinary nozzle or spray gun is limited, the number of reciprocating times is large, and the coating uniformity and coating amount cannot meet the process requirements. Summary of the invention

[0006] In view of this, the embodiments of the present application hope to provide a pneumatic high-speed rotary cup electrostatic spray nozzle to at least solve the above-mentioned technical problems.

[0007] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0008] The embodiment of the present application provides a pneumatic high-speed rotary cup electrostatic spray nozzle, including a base, a rotating shaft, a nozzle body, a shell, a former, a connector, a liquid separation plate, and a rotary cup, wherein:

[0009] The base is used to input compressed air;

[0010] The nozzle body of the base and the rotating shaft are assembled to form an inner cavity, and the lower end surface of the nozzle body is provided with an air hole for compressed air to be filled into the inner cavity and act on the impeller of the rotating shaft to provide rotational power for the rotating shaft;

[0011] A first gas channel is provided in the housing, and a guide pipe at the end of the first gas channel has a slope and an inclination for entering most of the compressed air.

[0012] The former, the rotating shaft and the liquid separation plate form a cavity, the compressed air outlet plane of the former is arc-shaped, the lower end surface of the liquid separation plate is sloped, the lower end surface of the liquid separation plate and the upper end surface of the former form an oblique gas outlet channel for compressed air, and further, the liquid separation plate is laterally provided with openings. The liquid separation plate is connected to the rotary cup through the connector, forming a coaxial extension of the liquid separation plate and the rotary cup;

[0013] The former, the shell and the nozzle body form a charged paint particle channel for inputting charged paint particles, the cavity channel of the former is tapered inside, and the lower end surface of the upper part of the former is arc-shaped, for ejecting the charged paint particles under the high-speed rotation of the rotating shaft;

[0014] The rotary cup is used to bring the charged paint particles sprayed from the former to the first arc angle position of the rotary cup, and spread them upward, flowing on the inner wall of the rotary cup in the form of a thin film until reaching the tip, so that the charged paint particles are attracted to the coated surface under the action of electrostatic force to form a uniformly coated surface.

[0015] Furthermore, the impeller is a specially formed, local vortex impeller, and an adjusting air hole is opened at the position of the impeller. The adjusting air hole is perpendicular to the lateral section of the impeller and is used to adjust the air injection effect of compressed air on the rotating shaft, thereby adjusting the rotation speed of the rotating shaft.

[0016] Furthermore, the nozzle of the paint injector is located in a charged paint particle channel formed by the former, the shell and the nozzle body.

[0017] Furthermore, the rotating shaft and the shell form a second gas channel for entering part of the compressed air; the outlet of the guide pipe at the end of the first gas channel causes axial pressure on the rotating shaft to enhance the rotation force. Furthermore, a regulator is included, which enters the regulating air hole and is used to adjust the ventilation volume of the second gas channel of the shell to adjust the rotation speed of the rotating shaft, thereby adjusting the diameter of the charged paint particles.

[0018] Furthermore, it also includes a first fastener, a second fastener, a third fastener and a bearing, and the rotating shaft is matched through the first fastener, the third fastener and the bearing; the former, the shell and the nozzle body are integrally connected through the second fastener; the nozzle body and the base are connected through a sealing thread.

[0019] Furthermore, when the atomized particles on the inner surface of the swirl cup flow outward, the local disturbance vortex intensity is low so that the charged paint particles can escape.

[0020] Furthermore, the nozzle is made of a corrosion-resistant lightweight material.

[0021] Furthermore, the nozzle is made of non-corrosion-resistant material, and an anti-corrosion coating is provided on the outer layer.

[0022] The pneumatic high-speed rotary cup electrostatic spray nozzle provided by the present application is seamlessly connected in one piece, has a smooth appearance after assembly, has no obvious dead angle area, and is easy to maintain in an acidic working environment. The workpiece used is simple and easy to assemble, and the lost parts are easy to replace. The matching position of the internal cavity is guided by pneumatic flow, and there is no closed-loop circulation area for liquid storage. The spray width shape achieved by the nozzle presents a fan shape with high dispersion, and there is no missing coating area or unevenness. The utilization rate of the sprayed paint can reach 90-95%. In the factory where the nozzle is running, the charged paint particles are fully atomized and utilized through electrostatic force, which basically eliminates the situation of dispersion into the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a longitudinal cross-sectional schematic diagram of a pneumatic high-speed rotary cup electrostatic spray nozzle in this application;

[0024] Figure 2 It is a partial longitudinal cross-sectional schematic diagram of a pneumatic high-speed rotary cup electrostatic spray nozzle in this application;

[0025] Figure 3 It is a schematic cross-sectional view of the pneumatic high-speed rotary cup electrostatic spray nozzle in this application. DETAILED DESCRIPTION

[0026] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0027] The various specific technical features in the various embodiments described in the specific implementation methods can be combined in various ways without contradiction. For example, different implementation methods can be formed by combining different specific technical features. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0028] In the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0029] It should be noted that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It is understandable that the specific order or sequence of "first\second\third" can be interchanged where permitted. It should be understood that the objects distinguished by "first\second\third" can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0030] The following combination Figures 1 to 3 The pneumatic high-speed rotary cup electrostatic spray nozzle recorded in the embodiment of the present application is described in detail.

[0031] like Figures 1 to 3 As shown, the pneumatic high-speed rotary cup electrostatic spray nozzle includes a base 12, a rotating shaft 10, a nozzle body 7, a shell 6, a former 5, a connector 4, a liquid separation plate 2, a rotary cup 14, a first fastener 3, a second fastener 8, a third fastener 11 and a bearing 9.

[0032] Compressed air is input from the base 12, and the nozzle body 7 and the base 12 are connected by sealing threads to form a cavity, and the upper end surface of the cavity is a semi-arc connecting plane.

[0033] The nozzle body 7 and the rotating shaft 10 are assembled to form an inner cavity. The lower end surface of the nozzle body 7 is provided with air holes. Compressed air is filled into the inner cavity and acts on the impeller 10a of the rotating shaft 10 to provide rotational power for the rotating shaft.

[0034] A first gas channel is provided in the shell 6, and the end guide pipe of the first gas channel has a slope and inclination. Most of the compressed air enters the first gas channel. The outlet of the end guide pipe of the first gas channel causes axial side pressure on the rotating shaft 10 to enhance the rotation force.

[0035] The rotating shaft 10 and the housing 6 form a second gas passage, and part of the compressed air enters the second gas passage.

[0036] The former 5, the rotating shaft 10 and the separator 2 form a cavity. The compressed air outlet plane of the former 5 is arc-shaped. The lower end surface of the separator 2 is sloped. The lower end surface of the separator 2 and the upper end surface of the former 5 form an oblique gas outlet channel for compressed air.

[0037] The liquid separation plate 2 is provided with an opening on the side, and the liquid separation plate 2 is connected to the bell 14 through the connector 4, so that the liquid separation plate and the bell are coaxially extended.

[0038] The former 5 , the shell 6 and the nozzle body 7 form a charged paint particle channel 13 , and the nozzle of the paint injector can be located in the charged paint particle channel 13 formed by the former 5 , the shell 6 and the nozzle body 7 .

[0039] The charged paint particles are input into the charged paint particle channel 13. The interior of the cavity channel of the former 5 is conical, and the lower plane of the upper end surface of the former 5 is arc-shaped, so that the charged paint particles are ejected under the high-speed rotation of the rotating shaft 10.

[0040] The rotary cup 14 brings the charged paint particles sprayed from the former 5 to the first arc angle position of the rotary cup 14, and spreads them upward, flowing on the inner wall of the rotary cup 14 in the form of a thin film until reaching the tip, so that the charged paint particles are attracted to the coated surface under the action of electrostatic force, forming a uniformly coated surface.

[0041] The rotating shaft is matched by the first fastener 3 , the third fastener 11 and the bearing 9 .

[0042] The former 5 , the shell 6 and the nozzle body 7 are integrally connected via a second fastener 8 .

[0043] In this embodiment, the impeller 10a is a specially shaped impeller with a local vortex, and the impeller drives the rotating shaft 10 to rotate at a high speed under the action of compressed air.

[0044] In this embodiment, an adjusting air hole 1 is opened at the position of the impeller 10a. The adjusting air hole 1 is perpendicular to the lateral section of the impeller 10a, and the air injection effect of the compressed air on the rotating shaft 10 can be adjusted, thereby adjusting the rotation speed of the rotating shaft 10.

[0045] In this embodiment, the nozzle also includes a regulator (not shown), which enters the regulating air hole 1 and can adjust the ventilation volume of the first gas channel of the shell 6 to adjust the rotation speed of the rotating shaft 10, thereby adjusting the diameter of the charged paint particles.

[0046] In this embodiment, when the atomized particles on the inner surface of the swirl cup 14 flow outward, the local disturbance vortex intensity is low, so that the charged paint particles can escape.

[0047] In this embodiment, the nozzle is made of a corrosion-resistant lightweight material, or a common metal material, and an anti-corrosion coating is provided on the outer layer.

[0048] The working process of the pneumatic high-speed rotary cup electrostatic spray nozzle is described in detail below.

[0049] Compressed air enters from the base 12, and the nozzle body 7 is connected to the base 12 nozzle body through a sealing thread to form a cavity. The upper end surface of the cavity is designed as a semi-arc connecting plane, which can ensure that compressed air is filled into it without causing strong pressure to cause equipment vibration.

[0050] There are air holes for compressed air on the lower end face of the nozzle body 7 to ensure that the compressed air is filled into the inner cavity of the nozzle body 7. The inner cavity of the nozzle body 7 is formed by assembling the nozzle body 7 and the rotating shaft 10. The compressed air provides power for the rotating shaft in the cavity. The compressed air acts on the position of the impeller 10a. The impeller 10a is designed with a specially formed impeller with local vortex, which can drive the rotating shaft 10 to rotate at high speed.

[0051] Most of the compressed air enters the first gas channel reserved in the shell 6. The end guide pipe of the first gas channel in the shell 6 is designed with a slope and inclination to facilitate the compressed air diversion. At the same time, there is no vortex. The outlet of the end guide pipe of the first gas channel causes axial pressure on the rotating shaft 10 to enhance the rotation force. Part of the compressed air enters the second gas channel formed by the rotating shaft 10 and the shell 6.

[0052] The compressed air is collected and enters the cavity formed by the former 5, the rotating shaft 10 and the liquid separation plate 2. The plane of the compressed air outlet of the former 5 is designed to be an arc shape to facilitate the flow guidance.

[0053] The compressed air impacts the lower end surface of the separator plate 2, and the lower end surface of the separator plate 2 is designed with a slope. The lower end surface of the separator plate 2 and the upper end surface of the former 5 form an oblique gas outlet channel for the compressed air. The separator plate 2 has an opening on the side, which is connected to the bell cup 14 through the connector 4. Through this multi-connection form, a coaxial extension of the separator plate 2 and the bell cup 14 can be formed.

[0054] The lower end surface design of the liquid separation plate 2 can effectively relieve part of the compressed air pressure, and the shaking caused by the high-speed rotation of the rotating shaft 10, the bell cup 14 is very easy to fall out under the action of centrifugal force and particulate matter. The liquid separation plate 2 can effectively prevent the bell cup 14 from falling out, and through the close fit of the connector 4, the damage to components caused by gap vibration can be reduced.

[0055] The setting angle of the regulating air hole 1 is perpendicular to the lateral section of the impeller, which can effectively adjust the air injection effect of the compressed air on the rotating shaft 10. At the same time, the regulator entering the regulating air hole can also adjust the ventilation volume of the first gas channel of the shell 6, and can adjust the rotation speed of the rotating shaft 10, and then adjust the average diameter of the charged coating particles decomposed into tiny particles.

[0056] The rotating shaft 10 is matched with the main structure through the first fastener 3, the third fastener 11 and the radial bearing of the bearing 9. The friction is greatly reduced by the match between the ball and the raceway of the bearing, and the rotating shaft 10 can also achieve high-speed rotation.

[0057] The former 5, the shell 6, and the nozzle body 7 are integrally connected by the second fastener 8 without any gap. After assembly, the appearance is smooth without obvious dead angles. In an acidic working environment, it is easy to maintain. The workpieces used are simple and easy to assemble. The matching position of the internal cavity is guided by pneumatic diversion, and there is no closed-circuit circulation area for liquid storage.

[0058] The former 5, the shell 6, and the nozzle body 7 are closely matched to form a charged paint particle channel 13. The nozzle of the paint injector can penetrate into the pipeline. The charged paint particles enter the charged paint particle channel 13 and adhere to the smooth inner wall of the channel. Through the high-speed rotation of the rotating shaft 11, they are sprayed outward from the inner wall of the cavity channel of the former 5. The inner wall of the cavity channel of the former 5 is conical, and the lower end face of the upper part of the former 5 is arc-shaped, providing a spraying channel for the charged paint particles.

[0059] Due to the centrifugal force of high-speed rotation, the paint is fully atomized, and the average diameter of the decomposed atomized charged paint particles is 10 to 20 μm.

[0060] After being ejected from the cavity of the former 5, the charged coating particles reach the first arc angle position of the rotary cup 14, and spread upward, flowing on the inner wall of the rotary cup 14 in the form of a thin film until reaching the tip. The charged particles are attracted to the coated surface due to the electrostatic force, forming a uniformly coated surface.

[0061] The inner surface design of the swirl cup 14 avoids the self-spin of the compressed air and the rotation of the air and particles in the local space. The local disturbance vortex intensity is low, which facilitates the particles to escape from the nozzle.

[0062] In order to improve the anti-corrosion performance, the pneumatic high-speed rotary cup electrostatic spray nozzle is made of corrosion-resistant lightweight materials: it can be but not limited to the following: metal materials titanium, titanium alloy or non-metallic materials PEEK. Or use ordinary metal materials, and apply anti-corrosion coating on the outer layer.

[0063] The pneumatic high-speed rotary cup electrostatic spray nozzle in this embodiment is seamlessly connected, has a smooth appearance after assembly, has no obvious dead angle area, and is easy to maintain in an acidic working environment. The workpiece used is simple and easy to assemble, and the matching position of the internal cavity is guided by pneumatic flow, and there is no closed-loop circulation area for liquid storage. The spray width shape achieved by the nozzle presents a fan shape with high dispersion, and there is no missing coating area and unevenness. The utilization rate of the sprayed paint can reach 90-95%. In the factory where the nozzle is running, the charged paint particles are fully atomized and utilized through electrostatic force, which basically eliminates the situation of dispersion into the air.

[0064] The use of the pneumatic high-speed rotary cup electrostatic spray nozzle is not limited to the electrode spraying direction in the electrolysis field, but can also be used in other popular fields of electrostatic spraying.

[0065] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A pneumatic high-speed rotary cup electrostatic spray nozzle, characterized in that: It includes a base, a rotating shaft, a nozzle body, a shell, a former, a connector, a liquid separation plate, and a rotary cup, wherein: The base is used to input compressed air; The nozzle body of the base and the rotating shaft are assembled to form an inner cavity, and the lower end surface of the nozzle body is provided with an air hole for compressed air to be filled into the inner cavity and act on the impeller of the rotating shaft to provide rotational power for the rotating shaft; A first gas channel is provided in the housing, and a terminal flow guide pipe of the first gas channel has a slope and an inclination for admitting most of the compressed air; The former, the rotating shaft and the liquid separation plate form a cavity, the compressed air outlet plane of the former is arc-shaped, the lower end surface of the liquid separation plate is sloped, the lower end surface of the liquid separation plate and the upper end surface of the former form an oblique gas outlet channel for compressed air, the liquid separation plate is laterally provided with openings, the liquid separation plate is connected to the rotary cup through the connector, forming a coaxial extension of the liquid separation plate and the rotary cup; The former, the shell and the nozzle body form a charged paint particle channel for inputting charged paint particles, the cavity channel of the former is tapered inside, and the lower end surface of the upper part of the former is arc-shaped, for ejecting the charged paint particles under the high-speed rotation of the rotating shaft; The rotary cup is used to bring the charged paint particles sprayed from the former to the first arc angle position of the rotary cup, and spread them upward, flowing on the inner wall of the rotary cup in the form of a thin film until reaching the tip, so that the charged paint particles are attracted to the coated surface under the action of electrostatic force to form a uniformly coated surface.

2. The pneumatic high-speed rotary cup electrostatic spray nozzle according to claim 1, characterized in that: The impeller is a specially shaped, local vortex impeller, and an adjusting air hole is opened at the position of the impeller. The adjusting air hole is perpendicular to the lateral section of the impeller and is used to adjust the air injection effect of compressed air on the rotating shaft, thereby adjusting the rotation speed of the rotating shaft.

3. The pneumatic high-speed rotary cup electrostatic spray nozzle according to claim 1, characterized in that: The nozzle of the paint injector is located in a charged paint particle channel formed by the shaper, the shell and the spray head body.

4. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The nozzle body and the base are connected to form a cavity, and the upper end surface of the cavity is a semi-arc connecting plane.

5. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: A regulator is also included. The regulator enters the regulating air hole and is used to adjust the ventilation volume of the first gas channel of the shell to adjust the rotation speed of the rotating shaft, thereby adjusting the diameter of the charged paint particles.

6. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The rotating shaft and the shell form a second gas channel for the intake of part of the compressed air; the outlet of the guide pipe at the end of the first gas channel creates shaft side pressure on the rotating shaft to enhance the rotation force.

7. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: It also includes a first fastener, a second fastener, a third fastener and a bearing, wherein the rotating shaft is matched with the first fastener, the third fastener and the bearing; the former, the shell and the nozzle body are integrally connected by the second fastener; The nozzle body is connected to the base via a sealing thread.

8. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: When the atomized particles on the inner surface of the vortex cup flow outward, the local disturbance vortex intensity is low so that the charged paint particles can escape.

9. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The nozzle is made of corrosion-resistant lightweight material.

10. The pneumatic high-speed rotary cup electrostatic spray nozzle according to claim 9, characterized in that: The corrosion-resistant lightweight material is a metal material of titanium, a titanium alloy or a non-metal material of PEEK.

11. The pneumatic high-speed rotary cup electrostatic spray nozzle according to any one of claims 1 to 3, characterized in that: The material of the nozzle is a non-corrosion-resistant material, and an anti-corrosion coating is arranged on the outer layer of the non-corrosion-resistant material.

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