A central duct exhaust structure for an electrostatic duster

Abstract

The application relates to a center-pipe air-extracting structure of an electrostatic powder spraying chamber, which is composed of a top wall, a side wall and a bottom wall to form a powder spraying cavity in the electrostatic powder spraying chamber, a suction port is formed by being recessed in the center of the bottom wall, the bottom of the suction port is an air-extracting pipe, an air-extracting fan is arranged to form a negative pressure air flow at the suction port through the air-extracting pipe, two movable pieces are arranged in the suction port and above the air-extracting pipe, the two movable pieces can rotate, the two movable pieces are sucked to the air-extracting pipe under the action of the negative pressure of the air-extracting fan and three air-extracting narrow channels are formed along the inner wall of the suction port, the negative pressure air flow generated by the air-extracting fan is distributed into three air-extracting air flows by the three air-extracting narrow channels. During the air-extracting process, the movable pieces are always sucked to cover the top and two sides of the air-extracting pipe, powder accumulation on the top and two sides of the air-extracting pipe is reduced, the movable pieces are convenient to clean, and the three air-extracting air flows bring better air-extracting effects.

Description

Technical Field

[0001] This invention relates to the field of electrostatic powder coating technology, specifically to a central duct exhaust structure for an electrostatic powder coating chamber. Background Technology

[0002] During electrostatic powder coating, the spray gun is connected to the negative terminal, while the workpiece is connected to the positive terminal and grounded. Under the high voltage of the high-voltage electrostatic generator, an electrostatic field is formed between the tip of the spray gun and the workpiece. The electric force on the paint particles is directly proportional to the main voltage of the electrostatic field and the charge of the paint, and inversely proportional to the distance between the spray gun and the workpiece. When the voltage is high enough, an air electric field is formed near the tip of the spray gun. The air is intensely ionized and heated, causing a dark red halo to form around the sharp edge of the spray gun tip or the electrode needle, which can be clearly seen in the dark. At this time, the air produces a strong corona discharge.

[0003] The powder coating process needs to be carried out in a relatively enclosed electrostatic powder coating chamber. Generally, an electrostatic powder coating chamber consists of a top wall, outer side walls, and a bottom wall. During powder coating, the powder that is not coated onto the workpiece falls back to the bottom due to its own gravity. Usually, an exhaust pipe is installed on the bottom wall, and an exhaust fan is connected to the exhaust pipe. After the exhaust fan generates negative pressure, the powder that was not used for coating is extracted through the exhaust pipe and can be recycled.

[0004] As attached Figure 1 The existing electrostatic powder spraying chamber has a flat top surface for the exhaust duct A, causing the falling powder to accumulate on the top surface of the exhaust duct A, as well as on both sides of the exhaust duct A. This not only makes cleaning very inconvenient, but also results in extremely poor powder extraction, affecting the normal operation of electrostatic powder spraying. Summary of the Invention

[0005] The purpose of this invention is to provide a central duct exhaust structure for an electrostatic powder spraying chamber.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a central duct exhaust structure for an electrostatic powder spraying chamber, comprising a top wall, side walls, and a bottom wall forming the electrostatic powder spraying chamber. A powder spraying cavity is formed within the electrostatic powder spraying chamber. An air intake is formed by a recess in the center of the bottom wall. The bottom of the air intake is an exhaust pipe, configured such that an exhaust fan creates a negative pressure exhaust airflow through the exhaust pipe at the air intake. Two movable components are disposed within the air intake, located above the exhaust pipe. These two movable components are rotatable and are held in place by the negative pressure of the exhaust fan, moving along the exhaust pipe. The inner wall of the nozzle forms three narrow exhaust channels. The negative pressure airflow generated by the exhaust fan is distributed into three corresponding exhaust airflows by the three narrow exhaust channels. The exhaust pipe is connected to the exhaust fan. When the exhaust fan is working, it generates negative pressure. Under the distribution action of two moving parts, it forms three exhaust airflows through the three narrow exhaust channels. This absorbs the electrostatic powder that has not been sprayed onto the workpiece in the electrostatic powder spraying chamber, making it easy to recycle. Since the moving parts are rotating and movable, they are always sucked up during the exhaust process to cover the top of the exhaust pipe, reducing the accumulation of powder on the top and sides of the exhaust pipe and making it easy to clean. At the same time, the three exhaust airflows bring better exhaust effect.

[0007] The cross-section of the exhaust duct is circular or non-circular, preferably circular, elliptical or square.

[0008] The movable part is penetrated by a rotating shaft and can be eccentrically connected to the air intake through the rotating shaft, thereby realizing the rotational connection relationship of the movable part.

[0009] The rotating shaft is detachably connected to the air intake. After the rotating shaft is quickly disassembled, the moving parts can be removed for cleaning, simplifying the cleaning process.

[0010] The three exhaust ducts include a first exhaust duct, a second exhaust duct, and a third exhaust duct. The second exhaust duct is located between the first and third exhaust ducts. The first and third exhaust ducts are formed by the bottom of the movable parts engaging with the inner wall of the air intake. The second exhaust duct is formed by the gap between the two movable parts. The first, second, and third exhaust ducts accelerate the airflow speed, thus improving the exhaust effect.

[0011] The connection position of the rotating shaft within the air intake is adjustable to change the width of the first, second, and third air intake channels. Therefore, the airflow of each air intake channel can be changed. Since the movable parts are symmetrically arranged about the vertical center line of the air intake, the first and second air intake channels are identical.

[0012] The movable component can be a metal component or a non-metal component, and the shape of the movable component is designed with consideration of the shape of the corresponding exhaust pipe and air inlet.

[0013] The widths of the first, second, and third exhaust ducts are between 0.2 and 50 mm.

[0014] Along the longitudinal section of the air inlet, the inner wall line of the air inlet forms an acute angle with its vertical center line. The airflow formed by the first and third air inlets expands upward and outward from the bottom of the spray chamber, thereby increasing the exhaust area and improving the exhaust effect. Attached Figure Description

[0015] Figure 1 This is a plan view of an electrostatic powder spraying chamber in the prior art;

[0016] Figure 2 This is a plan view of the central duct exhaust structure of the electrostatic powder spraying chamber of the present invention during operation;

[0017] Figure 3 This is a plan view of the central duct exhaust structure of the electrostatic powder spraying chamber of the present invention when it is not in operation;

[0018] Figure 4 for Figure 2 Enlarged diagram of part B in the middle;

[0019] Figure 5 A schematic diagram of the central duct exhaust structure of an electrostatic powder spraying chamber with an elliptical cross-section.

[0020] Figure 6 This is a schematic diagram of the central duct exhaust structure of an electrostatic powder spraying chamber, where the exhaust duct has a square cross-section.

[0021] In the attached diagram: Existing exhaust pipe A, top wall 1, side wall 2, bottom wall 3, air inlet 4, exhaust pipe 5, movable part 6, exhaust airflow 7, rotating shaft 8, first exhaust duct 9, second exhaust duct 10, and third exhaust duct 11. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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, they should not be construed as limitations on this invention.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] like Figure 1 The existing electrostatic powder coating chamber has a flat top for the exhaust duct, causing the fallen electrostatic powder to accumulate on the top and sides of the exhaust duct A, which makes cleaning very inconvenient and the extraction effect is not ideal. Therefore, it is urgent to improve the traditional electrostatic powder coating chamber.

[0027] Example 1:

[0028] This embodiment provides a central duct exhaust structure for an electrostatic powder spraying chamber.

[0029] See Figure 2 and Figure 3In this embodiment, an electrostatic powder spraying chamber is constructed from a top wall 1, a side wall 2, and a bottom wall 3. The electrostatic powder spraying chamber forms a powder spraying cavity. A suction port 4 is recessed at the center of the bottom wall 3. The bottom of the suction port 4 is a suction pipe 5, configured to generate a negative pressure suction airflow 7 through the suction pipe 5 via an exhaust fan at the suction port 4. Two movable parts 6 are disposed inside the suction port 4, located above the exhaust pipe 5. These two movable parts 6 are rotatable and are held in place by the negative pressure of the exhaust fan, forming three narrow suction channels along the inner wall of the suction port 4. The exhaust fan generates negative pressure airflow, which is distributed into three corresponding exhaust airflows 7 by the three narrow exhaust channels. The exhaust pipe 5 is connected to the exhaust fan. When the exhaust fan is working, it generates negative pressure, which is distributed by two movable parts 6 and forms three exhaust airflows 7 through the three narrow exhaust channels. This absorbs the electrostatic powder that has not been sprayed onto the workpiece in the electrostatic powder spraying chamber, making it easy to recycle. Since the movable parts 6 are rotating and movable, they are always sucked up during the exhaust process to cover the top of the exhaust pipe 5, reducing the accumulation of powder on the top and sides of the exhaust pipe 5, making it easy to clean. At the same time, the three exhaust airflows 7 bring better exhaust effect.

[0030] like Figure 3 Based on the rotational movement of the movable part 6, the movable part 6 is penetrated by the rotating shaft 8 and can be eccentrically adjusted and connected to the air intake 4 through the rotating shaft 8. During operation, the movable part 6 covers the outside of the exhaust pipe 5 to prevent powder from accumulating on the exhaust pipe 5 and its sides. After the movable part 6 is flipped up, it is easy to remove the exhaust pipe 5 for cleaning or maintenance.

[0031] In this embodiment, the rotating shaft 8 and the air intake 4 are detachably connected. After the rotating shaft 8 is quickly disassembled, the movable part 6 can be taken out for cleaning, simplifying the cleaning work.

[0032] like Figure 3 The three exhaust ducts include a first exhaust duct 9, a second exhaust duct 10, and a third exhaust duct 11. Since the two movable parts 6 are symmetrically arranged about the vertical center line of the air intake 4, the first exhaust duct 9 and the third exhaust duct 11 are consistent. The second exhaust duct 10 is located between the first exhaust duct 9 and the third exhaust duct 11. The first exhaust duct 9 and the third exhaust duct 11 are formed by the bottom of the movable parts 6 cooperating with the inner wall of the air intake 4. The second exhaust duct 10 is formed by the interval between the two movable parts 6. The movable parts 6 distribute the gas flow. The first exhaust duct 9, the second exhaust duct 10, and the third exhaust duct 11 accelerate the flow rate of the exhaust airflow 7, thus improving the exhaust effect.

[0033] Moreover, see Figure 2 or Figure 3Along the longitudinal section of the air inlet 4, the inner wall line of the air inlet 4 forms an acute angle with its vertical center line. The exhaust airflow 7 formed by the first exhaust duct 9 and the third exhaust duct 11 expands outward from the bottom of the spraying chamber, thereby increasing the exhaust area and improving the exhaust effect.

[0034] The connection position of the rotating shaft 8 within the air intake 4 is adjustable to change the width of the first exhaust duct 9, the second exhaust duct 10, and the third exhaust duct 11. In this embodiment, the widths of the first exhaust duct 9, the second exhaust duct 10, and the third exhaust duct 11 are between 0.2 and 50 mm. Therefore, the airflow of the three exhaust ducts can be changed. Since the movable part 6 is symmetrically arranged about the vertical center line of the air intake 4, the first exhaust duct 9 and the second exhaust duct 10 are aligned, and their connection position with the rotating shaft 8 is adjustable. Figure 4 A horizontal limiting groove (not shown in the figure) is opened on both sides inside the air intake 4. The limiting groove has a semi-circular positioning groove for the rotating shaft 8 to be positioned. There are multiple positioning grooves, which are spaced apart along the length of the positioning groove. When the rotating shaft 8 is placed in the positioning groove at different positions, the position of the rotating shaft 8 can be adjusted. The first exhaust duct 9, the second exhaust duct 10 and the third exhaust duct 11 can also be adjusted naturally, thereby changing the exhaust flow rate.

[0035] In this embodiment, the cross-section of the exhaust pipe 5 is circular or non-circular. Non-circular pipes are preferably elliptical or square, as shown in the figure. The air inlet 4 is circular. The movable component 6 is a metal component or a non-metal component. The shape of the movable component 6 is designed with consideration of the shapes of the exhaust pipe 5 and the air inlet 4.

[0036] Example 2:

[0037] This embodiment provides a central duct exhaust structure for an electrostatic powder spraying chamber, which differs from Embodiment 1 in some aspects.

[0038] In this embodiment, an electrostatic powder spraying chamber is constructed from a top wall 1, a side wall 2, and a bottom wall 3. The electrostatic powder spraying chamber forms a powder spraying cavity. A suction port 4 is recessed at the center of the bottom wall 3. The bottom of the suction port 4 is a suction pipe 5, configured to generate a negative pressure suction airflow 7 through the suction pipe 5 via an exhaust fan at the suction port 4. Two movable parts 6 are disposed inside the suction port 4, located above the exhaust pipe 5. These two movable parts 6 are rotatable and are held in place by the negative pressure of the exhaust fan, forming three narrow suction channels along the inner wall of the suction port 4. The exhaust fan generates negative pressure airflow, which is distributed into three corresponding exhaust airflows 7 by the three narrow exhaust channels. The exhaust pipe 5 is connected to the exhaust fan. When the exhaust fan is working, it generates negative pressure, which is distributed by the two movable parts 6 and forms three exhaust airflows 7 through the three narrow exhaust channels. This absorbs the electrostatic powder that has not been sprayed onto the workpiece in the electrostatic powder spraying chamber, making it easy to recycle. Since the movable parts 6 are rotating movable connections, they are always sucked up during the exhaust process to cover the top of the exhaust pipe 5, reducing the accumulation of powder on the top and sides of the exhaust pipe 5, making it easy to clean. At the same time, the three exhaust airflows 7 bring better exhaust effect.

[0039] Based on the rotational movement of the movable part 6, the movable part 6 is penetrated by the rotating shaft 8 and rotatably connected to the air intake 4 through the rotating shaft 8. During operation, the movable part 6 covers the outside of the exhaust pipe 5 to prevent powder from accumulating on the exhaust pipe 5 and its sides. After the movable part 6 is flipped up, it is easy to remove the exhaust pipe 5 for cleaning or maintenance.

[0040] In this embodiment, the rotating shaft 8 and the air intake 4 are detachably connected. After the rotating shaft 8 is quickly disassembled, the movable part 6 can be taken out for cleaning, simplifying the cleaning work.

[0041] The three exhaust ducts include a first exhaust duct 9, a second exhaust duct 10, and a third exhaust duct 11. Since the two movable parts 6 are symmetrically arranged about the vertical center line of the air intake 4, the first exhaust duct 9 and the third exhaust duct 11 are consistent. The second exhaust duct 10 is located between the first exhaust duct 9 and the third exhaust duct 11. The first exhaust duct 9 and the third exhaust duct 11 are formed by the bottom of the movable parts 6 cooperating with the inner wall of the air intake 4. The second exhaust duct 10 is formed by the interval between the two movable parts 6. The movable parts 6 distribute the gas flow. The first exhaust duct 9, the second exhaust duct 10, and the third exhaust duct 11 accelerate the flow rate of the exhaust airflow 7, thus improving the exhaust effect.

[0042] Furthermore, along the longitudinal section of the air inlet 4, the inner wall line of the air inlet 4 forms an acute angle with its vertical center line. The exhaust airflow 7 formed by the first exhaust duct 9 and the third exhaust duct 11 expands outward from the bottom of the spray chamber, thereby increasing the exhaust area and improving the exhaust effect.

[0043] The connection position of the rotating shaft 8 within the air intake 4 is adjustable to change the width of the first exhaust duct 9, the second exhaust duct 10, and the third exhaust duct 11. In this embodiment, the widths of the first exhaust duct 9, the second exhaust duct 10, and the third exhaust duct 11 are between 0.2 and 50 mm. Therefore, the airflow of the three exhaust ducts can be changed. Since the movable part 6 is symmetrically arranged about the vertical center line of the air intake 4, the first exhaust duct 9 and the second exhaust duct 10 are aligned, and their connection position with the rotating shaft 8 is adjustable. Figure 4 A horizontal limiting groove (not shown in the figure) is opened on both sides inside the air intake 4. The limiting groove has a semi-circular positioning groove for the rotating shaft 8 to be positioned. There are multiple positioning grooves, which are spaced apart along the length of the positioning groove. When the rotating shaft 8 is placed in the positioning groove at different positions, the position of the rotating shaft 8 can be adjusted. The first exhaust duct 9, the second exhaust duct 10 and the third exhaust duct 11 can also be adjusted naturally, thereby changing the exhaust flow rate.

[0044] In this embodiment, the cross-section of the exhaust pipe 5 is circular or non-circular, and the non-circular cross-section is preferably elliptical or square. The movable component 6 is a metal component or a non-metal component, and the shape of the movable component 6 is designed with consideration of the shape of the exhaust pipe 5 and the air inlet 4.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A central duct exhaust structure for an electrostatic powder spraying chamber, characterized in that, An electrostatic powder spraying chamber is constructed from a top wall, side walls, and a bottom wall. The electrostatic powder spraying chamber forms a powder spraying cavity. A suction port is formed by a recess in the center of the bottom wall. The bottom of the suction port is an exhaust pipe, which is configured to generate a negative pressure exhaust airflow through the exhaust pipe. Two movable parts are provided in the suction port above the exhaust pipe. The two movable parts are rotatable. The two movable parts are sucked onto the exhaust pipe by the negative pressure of the exhaust fan and form three narrow exhaust channels along the inner wall of the suction port. The negative pressure airflow generated by the exhaust fan is distributed into three corresponding exhaust airflows by the three narrow exhaust channels. The movable part is penetrated by a rotating shaft and can be eccentrically adjusted and connected to the air intake through the rotating shaft; The rotating shaft and the air intake are detachably connected; The three exhaust ducts include a first exhaust duct, a second exhaust duct, and a third exhaust duct. The second exhaust duct is located between the first exhaust duct and the third exhaust duct. The first exhaust duct and the third exhaust duct are formed by the bottom of the movable part cooperating with the inner wall of the air intake. The second exhaust duct is formed by the gap between the two movable parts. The connection position of the rotating shaft within the air intake is adjustable to change the width of the first, second, and third air intake channels.

2. The central duct exhaust structure of the electrostatic powder spraying chamber according to claim 1, characterized in that, The exhaust duct has a circular cross-section.

3. The central duct exhaust structure of the electrostatic powder spraying chamber according to claim 1, characterized in that, The cross-section of the exhaust duct is non-circular.

4. The central duct exhaust structure of an electrostatic powder spraying chamber according to any one of claims 1-3, characterized in that, The moving parts are non-metallic or metallic components.

5. The exhaust structure of the central duct of the electrostatic powder spraying chamber according to claim 1, characterized in that, The widths of the first, second, and third exhaust ducts are between 0.2 and 50 mm.

6. The central duct exhaust structure of an electrostatic powder spraying chamber according to any one of claims 1-3, characterized in that, Along the longitudinal section of the air intake, the inner wall line of the air intake forms an acute angle with its vertical center line.

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