Waste gas separation treatment equipment for paint spraying workshop

Abstract

The waste gas separation treatment equipment comprises a paint spraying room, a water curtain box, a pressure equalizing box and an air filtering box, a water collecting tank is arranged at the bottom of the paint spraying room, the water curtain box is connected to one side of the paint spraying room, the pressure equalizing box is connected to the top of the paint spraying room, and an inlet of the air filtering box is connected to the top of the air filtering box through a circulating air inlet pipe; an outlet of the air filter box is connected with an inlet of the surge tank through a circulating exhaust pipe; a gas-liquid separation plate set is arranged in the water curtain box, an overflow box is arranged on the side, close to the paint spraying room, of the dehumidification filter plate, an overflow guide plate is arranged on one side of the overflow box, a water curtain top plate is arranged below the overflow guide plate, a front water curtain plate is arranged on one side of the water curtain top plate, a rear water curtain plate is arranged on the side, close to the water curtain box, of the water curtain top plate, and an overflow groove is formed in the center of the water curtain top plate. By means of the double water curtains, the separation treatment efficiency of paint in waste gas can be remarkably improved, most gas is reserved in the system, and energy consumption and equipment investment can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment equipment, and in particular to a waste gas separation and treatment device for a paint spraying workshop. Background Technology

[0002] In surface treatment processes in industries such as automobiles, furniture, and machinery manufacturing, spray painting is a widely used technical step. Spray painting generally involves applying paint to workpieces using a spray gun. During the spray painting process, a large amount of paint that does not adhere to the workpiece surface, along with volatile organic compounds, will form mixed waste gas. This type of waste gas will pollute the atmospheric environment and harm human health.

[0003] To treat paint spraying exhaust gas, existing technologies employ wet treatment devices with water curtain cabinets to collect and treat this type of exhaust gas. By setting up a water curtain at the back, when the paint-containing exhaust gas passes through the water curtain during spraying, the collision and adsorption between the water and the paint particles cause most of the paint to be trapped in the water, thereby achieving gas-liquid separation. However, this type of water curtain cabinet has low paint capture efficiency, low separation efficiency, and is difficult to treat in the subsequent process, resulting in high operating costs. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a waste gas separation and treatment device for a paint spraying workshop, which has high efficiency in separating and treating paint particles from waste gas, reduces the difficulty of subsequent waste gas treatment, and has low operating costs.

[0005] According to an embodiment of the present invention, a waste gas separation and treatment device for a paint spraying workshop includes a paint spraying booth, a water curtain box, a pressure equalization box, and an air filter box. The paint spraying booth is equipped with a paint spraying robot, and a water collection tank is located at the bottom of the paint spraying booth. The water curtain box is connected to one side of the paint spraying booth, and the pressure equalization box is connected to the top of the paint spraying booth. The inlet of the air filter box is connected to the top of the air filter box via a circulating air intake pipe, and the outlet of the air filter box is connected to the inlet of the pressure equalization box via a circulating exhaust pipe. A circulating air pump is connected between the outlet of the air filter box and the circulating exhaust pipe. The water curtain box is equipped with a gas-liquid separation plate assembly. A dehumidifying filter plate is installed on the top of the water curtain box. An overflow box is located on the side of the dehumidifying filter plate closest to the paint booth. An overflow guide plate is located on one side of the overflow box. A water curtain top plate is located below the overflow guide plate. A front water curtain plate is located on the side of the water curtain top plate closest to the paint booth. A rear water curtain plate is located on the side of the water curtain top plate closest to the water curtain box. An overflow trough is located in the center of the water curtain top plate. A waste liquid tank connected to a water collection tank is located at the bottom of the water curtain box. A waste liquid purification pool is connected to one side of the waste liquid tank.

[0006] In this embodiment, the gas-liquid separation plate assembly includes a rear guide plate, an inclined separation plate, a closed-loop diverter, and a diverter baffle, which are distributed sequentially from bottom to top. The rear guide plate is connected to the bottom of the rear water curtain plate and is inclined away from the rear water curtain plate from top to bottom. A gap is formed between the rear guide plate and the back plate of the water curtain box. The inclined separation plate is inclined close to the rear water curtain plate from top to bottom, and a gap is formed between the inclined separation plate and the rear water curtain plate.

[0007] In this embodiment, the gas-liquid separation plate assembly also includes three sets of flow collecting plates. A flow collecting plate is provided between the inclined separation plate and the closed-loop flow divider, and a flow collecting plate is also provided between the closed-loop flow divider and the flow divider baffle. A flow collecting plate is also provided above the flow divider baffle.

[0008] In this embodiment, the closed-loop diverter has a hexagonal cross-section, a diverter inlet at the bottom, and a diverter exhaust at the top. The horizontal projections of the diverter inlet and the diverter exhaust are separated.

[0009] In this embodiment, the air filter box is provided with a first air filter, a second air filter and a cooling pipe, with the second air filter and the first air filter arranged sequentially on the side of the cooling pipe near the circulating air intake pipe.

[0010] In this embodiment, a dispersion plate is provided in the pressure equalization box, the dispersion plate is directly opposite the inlet of the pressure equalization box, and a pressure equalization filter is provided at the outlet of the pressure equalization box.

[0011] In this embodiment, a purification catalyst plate is provided above the pressure equalization filter, and an ultraviolet lamp assembly is provided in the pressure equalization box.

[0012] In this embodiment, a jet seat is provided between the rear water curtain plate and the front water curtain plate. The rear water curtain plate is provided with multiple jet clearance holes. The jet seat is provided with an air collection chamber. The jet seat is provided with a vent pipe that connects to the air collection chamber. Multiple jet heads are rotatably connected to one side of the jet seat and are respectively inserted into the corresponding jet clearance holes. The jet head is provided with a rotating jet channel. One end of the rotating jet channel is connected to the air collection chamber.

[0013] In this embodiment, an exhaust gas pipe is provided at the top of the waste liquid purification tank. The end of the exhaust gas pipe away from the waste liquid purification tank is connected to a combustion furnace. The outlet of the combustion furnace is connected to a vent pipe, which is equipped with an air jet filter and an air jet pump.

[0014] In this embodiment, a delivery pipe is provided on one side of the waste liquid purification tank, and a clear liquid temporary storage tank is provided at the end of the delivery pipe away from the waste liquid purification tank. A supply pipe is connected to the bottom of the clear liquid temporary storage tank, and the end of the supply pipe away from the clear liquid temporary storage tank is located above the overflow box. A liquid filter is provided in the clear liquid temporary storage tank, and a supply pump is provided in the supply pipe.

[0015] The embodiments of the present invention have at least the following beneficial effects: By installing a double water curtain consisting of a front and rear water curtain plate at the back of the spray booth, the contact rate between the exhaust gas and the water curtain can be significantly increased, thereby significantly improving the capture efficiency of paint in the exhaust gas. The separation efficiency of paint in the exhaust gas is high, and the exhaust gas treatment effect is good. The exhaust gas passing through the double water curtain passes through the gas-liquid separation plate assembly, where multiple baffles further achieve fine gas-liquid separation. This not only effectively removes large-diameter water droplets but also removes some residual paint. Finally, the airflow passes through the dehumidification filter plate, which adsorbs residual trace moisture and paint, providing highly clean and dry intake conditions for subsequent deep processing equipment. This effectively extends the service life and maintenance cycle of the core equipment and significantly saves operating costs. The air filter box further filters the water curtain. The pre-treated airflow undergoes deep purification and is connected to the air filter box and pressure equalization box via a circulation pipeline and circulation air pump. This allows the air that has undergone pre-treatment, dehumidification, and deep purification to be circulated back to the paint booth as fresh air. By retaining most of the gas within the system through internal circulation, the energy consumption and equipment investment for fresh air treatment can be effectively reduced, as well as the cost of gas emission treatment, further reducing operating costs. The overflow box and overflow guide plate ensure a stable supply of liquid to the overflow tank. The overflow from the overflow tank to both sides ensures that the liquid is guided to the front and rear water curtain plates in a uniform and stable laminar flow state, significantly improving the uniformity and continuity of the double water curtain formation. This effectively improves the stability of the water curtain's efficiency in capturing paint in the exhaust gas, resulting in high separation efficiency. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein: Figure 1 This is a three-dimensional structural diagram of the exhaust gas separation and treatment equipment in a paint spraying workshop according to an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the exhaust gas separation and treatment equipment in a paint shop according to an embodiment of the present invention, viewed from another perspective. Figure 3 This is a partial cross-sectional view of the exhaust gas separation and treatment equipment in a paint shop according to an embodiment of the present invention; Figure 4 for Figure 3 A magnified structural diagram of A in the diagram; Figure 5 This is a partial cross-sectional view of the exhaust gas separation and treatment equipment in a paint shop according to an embodiment of the present invention, taken from another perspective. Figure 6 This is a top view schematic diagram of the exhaust gas separation and treatment equipment in a paint spraying workshop according to an embodiment of the present invention; Figure 7 For along Figure 6Schematic diagram of the cross-sectional structure of B-B'; Figure 8 This is a top view of the jet generator in the exhaust gas separation and treatment equipment of the paint spraying workshop according to an embodiment of the present invention; Figure 9 For along Figure 8 Schematic diagram of the cross-sectional structure of C-C'; Figure 10 This is a perspective structural diagram of the jet nozzle in the exhaust gas separation and treatment equipment of the paint spraying workshop according to an embodiment of the present invention.

[0017] Figure label: 100 spray booths, 110 spray painting robots, and 120 water collection tanks; Water curtain box 200, waste liquid tank 201, gas-liquid separation plate assembly 210, rear guide plate 211, inclined separation plate 212, closed-loop diverter 213, diverter baffle 214, collector plate 215, diverter air inlet 216, diverter exhaust 217, dehumidification filter plate 220, overflow box 230, overflow guide plate 231, water curtain top plate 240, overflow trough 241, front water curtain plate 250, rear water curtain plate 260, jet clearance hole 261, jet seat 270, air collection chamber 271, vent pipe 280, jet filter 281, jet pump 282, jet head 290, rotating jet channel 291; Pressure equalization chamber 300, dispersion plate 310, pressure equalization filter 320, purification catalyst plate 330, ultraviolet lamp assembly 340; Air filter box 400, circulating air intake pipe 410, circulating air exhaust pipe 420, circulating air pump 421, first air filter 430, second air filter 440, cooling pipe 450; Waste liquid purification tank 500, waste gas pipe 510, liquid transfer pipe 520, clear liquid temporary storage tank 530, liquid supply pipe 540, liquid supply pump 541, liquid filter 550; Combustion furnace 600. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these 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 are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, left, right, front, back, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are 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 limiting this invention.

[0020] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0021] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0022] In surface treatment processes in industries such as automobiles, furniture, and machinery manufacturing, spray painting is a widely used technical step. Spray painting typically involves applying paint to workpieces using a spray gun. During the spray painting process, a large amount of paint that does not adhere to the workpiece surface, along with volatile organic compounds, forms a mixed waste gas. This waste gas pollutes the atmosphere and harms human health. To treat spray painting waste gas, existing technologies use wet treatment devices with water curtain cabinets to collect and treat this waste gas. By setting up a water curtain at the back, when the spray gun is spraying paint, the waste gas containing paint passes through the water curtain. The collision and adsorption between the water and paint particles cause most of the paint to be trapped in the water, thus achieving gas-liquid separation. However, this type of water curtain cabinet has low paint capture efficiency and low separation efficiency, making subsequent waste gas treatment difficult and increasing the workload of downstream purification devices. This significantly increases the system's maintenance and operating costs, resulting in high operating costs. Furthermore, existing spray painting workshops require a continuous intake of large amounts of fresh air from outdoors, which is then conditioned and humidified before being introduced, further increasing the operating costs of the spray painting workshop.

[0023] The following is for reference only. Figure 1 To be continued Figure 10 The present invention describes a waste gas separation and treatment device for a paint spraying workshop, which has high efficiency in separating and treating paint in waste gas, reduces the difficulty of subsequent waste gas treatment, and has low operating costs for circulating gas.

[0024] Reference Figures 1 to 10An embodiment of the present invention provides a waste gas separation and treatment device for a paint spraying workshop, comprising a paint spraying booth 100, a water curtain box 200, a pressure equalization box 300, and an air filter box 400. The paint spraying booth 100 is equipped with a paint spraying robot 110, and a water collection tank 120 is provided at the bottom of the paint spraying booth 100. The water curtain box 200 is connected to one side of the paint spraying booth 100, and the pressure equalization box 300 is connected to the top of the paint spraying booth 100. The outlet of the pressure equalization box 300 communicates with the internal space of the paint spraying booth 100. The inlet of the air filter box 400 is connected to the top outlet of the air filter box 400 through a circulating air intake pipe 410, and the outlet of the air filter box 400 is connected to the inlet of the pressure equalization box 300 through a circulating exhaust pipe 420. A circulating air pump 421 is connected between the outlet of the air filter box 400 and the circulating exhaust pipe 420, and the circulating air pump 421 is used to pump airflow along the circulating air intake pipe 410 to the circulating exhaust pipe 420. The water curtain box 200 is equipped with a gas-liquid separation plate assembly 210. A dehumidifying filter plate 220 is located on top of the water curtain box 200, between the gas-liquid separation plate assembly 210 and the circulating air inlet pipe 410. The dehumidifying filter plate 220 can be a zeolite-filled filter structure. An overflow box 230 is located on the side of the dehumidifying filter plate 220 closest to the paint booth 100. An overflow guide plate 231 perpendicular to the horizontal plane is located on one side of the overflow box 230. The top of plate 231 is connected to the edge of overflow box 230. Below overflow guide plate 231 is a water curtain top plate 240. A front water curtain plate 250 is located on the side of the water curtain top plate 240 closest to the spray booth 100, and a rear water curtain plate 260 is located on the side of the water curtain top plate 240 closest to the water curtain box 200. The front water curtain plate 250 serves as the side wall of the spray booth 100 closest to the water curtain box 200, and the rear water curtain plate 260 serves as the side wall of the water curtain box 200 closest to the spray booth 100. One side wall divides the interior space of the spray booth 100 and the interior space of the water curtain box 200. An overflow trough 241 is located at the center of the water curtain top plate 240, directly below the overflow guide plate 231. The extension direction of the overflow trough 241 is parallel to the extension direction of the front water curtain plate 250 and the rear water curtain plate 260, ensuring that the water overflowing from the overflow trough 241 can flow evenly and smoothly to the front water curtain plate 250 and the rear water curtain plate 260. 60. The bottom of the water curtain box 200 is provided with a waste liquid tank 201 connected to one side of the water collection tank 120. The gas-liquid separation plate group 210 and the rear water curtain plate 260 are both located above the waste liquid tank 201. The front water curtain plate 250 is located above the water collection tank 120 to ensure that the exhaust gas can enter the water curtain box 200 through the bottom of the front water curtain plate 250 and the rear water curtain plate 260. The side of the waste liquid tank 201 away from the water collection tank 120 is connected to a waste liquid purification pool 500.

[0025] By installing a double water curtain consisting of a front water curtain plate 250 and a rear water curtain plate 260 at the back of the spray booth 100, compared with the single water curtain treatment method in the prior art, the exhaust gas separation and treatment system of this application can significantly improve the contact probability between exhaust gas and water curtain, thereby significantly improving the capture efficiency of paint in exhaust gas. It can ensure that most of the paint is trapped in the water curtain and discharged with it. The separation and treatment efficiency of paint in exhaust gas is high and the exhaust gas treatment effect is good. The exhaust gas passing through the double water curtain passes through the gas-liquid separation plate group 210, and under the action of multiple baffles, it can further achieve fine gas-liquid separation. It can not only effectively remove large-diameter water droplets entrained, but also remove... Some residual paint remains, and the rising gas in the water curtain box 200 also partially contacts the water curtain of the rear water curtain plate 260, further capturing the paint in the exhaust gas. Finally, the airflow passes through the dehumidifying filter plate 220, which not only adsorbs residual trace moisture and paint, but its dense structure also intercepts the finest paint mist particles and aerosols that have penetrated the previous treatment. This three-stage synergistic purification mechanism of wet washing, physical separation, and dry fine filtration increases the purification precision step by step, effectively addressing the technical bottlenecks of incomplete paint mist treatment and secondary entrainment in traditional systems. It provides highly clean and dry air intake conditions for subsequent deep treatment equipment that may be connected, effectively... This extends the service life and maintenance cycle of core equipment, effectively saving operating costs. The air filter box 400 performs deep purification on the airflow that has undergone preliminary treatment by the water curtain box 200. A circulating pipeline and circulating air pump 421 connect the air filter box 400 and the equalizing box 300, allowing the pre-treated, dehumidified, and deeply purified air to be circulated as fresh air back to the paint booth 100. This internal circulation method retains most of the gas within the system, effectively reducing energy consumption and equipment investment in fresh air treatment, as well as reducing gas emission treatment costs, further lowering operating costs. The configuration of the dehumidifying filter plate 220 ensures the circulation of air... The dryness of the air effectively prevents the accumulation of humidity in the closed loop, ensuring the stability of the spraying environment and the safe operation of other equipment. The overflow box 230 and overflow guide plate 231 ensure a stable supply of liquid to the overflow tank 241. The overflow from the overflow tank 241 to both sides ensures that the liquid is guided to the front water curtain plate 250 and the rear water curtain plate 260 in a uniform and stable laminar flow state, significantly improving the uniformity and continuity of the double water curtain formation. This effectively avoids the technical problems of traditional technologies being unable to adapt to double water curtains, effectively improving the stability of the water curtain's efficiency in capturing paint in the exhaust gas, resulting in high separation and treatment efficiency. It effectively prevents water curtain interruptions. Furthermore, the separate design of the water collection tank 120 and the waste liquid tank 201, and the connection of the waste liquid purification tank 500, enables timely separation and centralized treatment of paint residue and wastewater, maintaining the cleanliness of the water circulation system, reducing maintenance frequency, and improving the long-term reliability of the entire system.

[0026] It is understood that the gas-liquid separation plate assembly 210 includes, from bottom to top, a rear guide plate 211, an inclined separation plate 212, a closed-loop diverter 213, and a diverter baffle 214. Below the front water curtain plate 250, there is a front guide bottom plate located above the water collection tank 120. The front guide plate is inclined from top to bottom away from the front water curtain plate 250, and the bottom of the front water curtain plate 250 has a serrated structure, which can effectively improve the smoothness and continuity of the water curtain's descent. A gap is formed between the front guide plate and the front water curtain plate 250, allowing paint spraying exhaust gases to pass through. The rear guide plate 211 is connected to the rear... At the bottom of the water curtain plate 260, the rear guide plate 211 is inclined from top to bottom away from the rear water curtain plate 260. The rear guide plate 211 and the back plate of the water curtain box 200 are separated. The back plate of the water curtain box 200 refers to the side wall of the water curtain box 200 opposite to the rear water curtain plate 260. The inclined separation plate 212, the flow collecting plate 215, the closed-loop flow divider 213 and the flow divider baffle 214 are all connected to the other two opposite side walls of the water curtain box 200. The inclined separation plate 212 is inclined from top to bottom close to the rear water curtain plate 260. The inclined separation plate 212 and the rear water curtain plate 260 are separated.

[0027] The serrated bottom structure design of the front water curtain plate 250 discretizes the continuous water curtain at the microscopic level, forming a series of regular falling water jets. This effectively reduces the risk of lateral displacement and tearing of the water curtain during descent due to surface tension or airflow disturbance, ensuring stable coverage. Furthermore, the serrated structure creates more local turbulence disturbance points at the bottom edge, enhancing contact and mixing between the exhaust gas and the falling water curtain as it passes through the gap between the front guide plate and the front water curtain plate 250, thereby improving the initial capture efficiency of paint mist. The non-parallel inclined channel formed by the rear guide plate 211, the inclined separation plate 212, and the rear water curtain plate 260 alters the upward trajectory of the airflow, forcing it to change direction multiple times within the gap between the plates, extending its residence time in the humid region. This design not only creates conditions for large droplets entrained in the airflow to impact the plate surface and be effectively separated under inertia, but also, together with the water curtain formed by the rear water curtain plate 260, constitutes a dynamic washing channel, achieving secondary deep washing and rectification of the exhaust gas.

[0028] Understandably, the gas-liquid separation plate assembly 210 also includes three sets of collecting plates 215. Collecting plates 215 are provided between the inclined separation plate 212 and the closed-loop diverter 213, and between the closed-loop diverter 213 and the diverter baffle 214. Collecting plates 215 are also provided above the diverter baffle 214. The collecting plates 215 are two inclined plates symmetrical about the center of the water curtain box 200, with a gap between them to allow the paint spraying exhaust gas to pass through. The extended lines of the two inclined plates in their cross-sectional state form an inverted V-shape.

[0029] The symmetrical inverted V-shaped structure of the three sets of collector plates 215 creates a series of converging and expanding flow fields within the airflow channel. When the airflow carrying droplets passes through the throat formed by the two inclined plates, the velocity increases, and the droplets in the airflow tend to maintain their original direction of motion due to inertia, thus increasing the probability of collision with the inclined plate walls. After passing through the throat, the airflow velocity decreases and the pressure recovers in the expansion section, which helps the separated liquid to flow downwards and converge. This periodically arranged collector plates 215 form a multi-stage inertial separation unit, separating droplets from the airflow step by step and efficiently. More importantly, the inverted V-shaped design allows the separated liquid to flow smoothly downwards along the inclined plate surfaces, preventing droplets from being re-entrained by subsequent high-speed airflow after stagnation on the wall, ensuring the long-term stability of the gas-liquid separation effect.

[0030] It is understandable that the cross-section of the closed-loop diverter 213 is hexagonal along the direction perpendicular to the horizontal plane. The bottom of the closed-loop diverter 213 is provided with a diverter inlet 216, and the top of the closed-loop diverter 213 is provided with a diverter exhaust port 217. The horizontal projection of the diverter inlet 216 and the horizontal projection of the diverter exhaust port 217 are separated. The horizontal projection refers to the projection on the horizontal plane along the direction perpendicular to the horizontal plane. The horizontal projection of the diverter inlet 216 and the horizontal projection of the diverter exhaust port 217 do not overlap. During the process of the paint spraying exhaust gas rising in the water curtain box 200, part of the paint spraying exhaust gas rises along the outer wall of the closed-loop diverter 213, while another part of the paint spraying exhaust gas enters the closed-loop diverter 213 through the diverter inlet 216, rises along the inclined inner wall of the closed-loop diverter 213, and is then output from the diverter exhaust outlet 217. It also collides with the part of the paint spraying exhaust gas rising along the outer wall of the closed-loop diverter 213. The two types of paint spraying exhaust gases rising inside and outside the closed-loop diverter 213 have different speeds and directions, which can effectively improve the gas-liquid separation effect.

[0031] Specifically, the top and bottom surfaces of the hexagonal closed-loop diverter 213 are parallel to the horizontal plane. The diverting air inlet 216 is located on the two inclined surfaces on the lower side of the closed-loop diverter 213, and the diverting exhaust port 217 is located on the two inclined surfaces on the upper side of the closed-loop diverter 213. This effectively prevents the paint spraying exhaust gas from rising vertically and further improves the effect of separating gas and liquid by passing through the velocity difference. With its unique hexagonal structure and internal and external dual-channel design, the closed-loop diverter 213 constitutes the core enhancement unit of the gas-liquid separation process. This structure forces the rising airflow to be transported through two paths. One part flows along the smooth outer wall surface, while the other part enters the internal channel through the bottom diverting air inlet 216 and climbs along its complex inclined inner wall surface, finally exiting from the top diverting exhaust port 217. When the two airflows converge near the top outlet area, their speed and direction differ significantly due to the different path lengths, wall friction resistance, and direction changes. It can generate controllable and intense airflow shearing and collision, causing residual, low-inertia, and difficult-to-separate fine droplets and aerosols in the airflow to coalesce under intense momentum exchange and turbulence, forming larger droplets, thus significantly increasing the probability of droplet sedimentation and separation. In short, this closed-loop diverter 213 shifts from passive interception to active induced coalescence and separation, greatly enhancing the system's ability to handle fine paint particles and water vapor.

[0032] It is understood that the air filter box 400 is equipped with a first air filter 430, a second air filter 440, and a cooling pipe 450 arranged sequentially along the airflow direction. The second air filter 440 and the first air filter 430 are sequentially arranged on the side of the cooling pipe 450 near the circulating air intake pipe 410. The first air filter 430 can be a paint-blocking cotton filter, the second filter can be a molecular sieve filter, and the cooling pipe 450 is used for circulating cooling water. When the paint spraying exhaust gas passes through the cooling pipe 450, its temperature decreases and moisture condenses, thereby effectively separating the gas and water. This effectively improves the dryness of the gas output from the outlet of the air filter box 400, thus ensuring the dryness of the gas returning to the paint booth 100 after passing through the equalization box 300, effectively ensuring the painting effect.

[0033] The first air filter 430, the second air filter 440, and the cooling coil 450 installed inside the air filter box 400 constitute a module for deep purification and precise temperature and humidity control of the circulating air. The first air filter 430 is responsible for intercepting trace paint particles that may remain after penetrating the upstream water curtain and gas-liquid separation stage; the second air filter 440 mainly adsorbs residual VOCs molecules and trace amounts of water vapor; the cooling coil 450, located downstream, actively cools the airflow through internal circulating cooling water. This ensures that residual water vapor in the airflow reaches saturation and condenses out; furthermore, the lower temperature conditions also help increase the adsorption capacity of any subsequent adsorption materials for organic matter. This three-stage series design ensures that the airflow flowing from the outlet of the air filter box 400 to the equalizing chamber 300 is not only highly clean, but also maintains a stable and controllable low temperature and humidity.

[0034] It is understood that the equalizing chamber 300 is equipped with a dispersion plate 310, which is directly opposite the inlet of the equalizing chamber 300 and has several dispersion holes. This can effectively disperse the uniformity of gas distribution in the equalizing chamber 300 and form a reliable pressure reduction effect. The outlet of the equalizing chamber 300 is equipped with an equalizing filter 320. The equalizing chamber 300 has multiple outlets, and each outlet of the equalizing chamber 300 is equipped with an equalizing filter 320, which can effectively improve the pressure equalization and filtration effect. Moreover, the pressure reduction effect can be effectively improved by expanding the output capacity.

[0035] The design of the dispersion plate 310 and the multi-outlet equalizing filter 320 in the equalizing box 300 works synergistically to achieve the key transformation of airflow from pipeline delivery to uniform distribution over a large area. The dispersion plate 310 faces the inlet, and the densely distributed dispersion holes on the plate create a sudden change in the cross-sectional area of ​​the flow channel, effectively consuming the airflow pressure, initially reducing the airflow velocity and dispersing it. Subsequently, the airflow reaches the end of the box, which has multiple outlets and corresponding equalizing filters 320. The setting of multiple outlets essentially diverts and expands the total airflow, further reducing the velocity and static pressure fluctuations at individual outlets. The equalizing filter 320 before each outlet, with its porous media structure, provides uniform resistance to airflow, acting as a rectifyer. This ensures that the airflow entering the paint booth 100 from each outlet achieves a high degree of uniformity and stability in both the velocity and pressure fields, and effectively controls the cleanliness of the air finally output to the paint booth 100. This uniform and stable air supply ensures a stable flow field in the working area of ​​the painting robot 110, thereby preventing paint mist from escaping and effectively improving the painting quality.

[0036] It is understood that each pressure equalizing filter 320 is equipped with a purification catalyst plate 330 above it. The purification catalyst plate 330 can be a titanium dioxide catalyst plate. The pressure equalizing box 300 is equipped with an ultraviolet lamp group 340. The ultraviolet lamp group 340 is used to purify the purification catalyst plate 330. Through the combination of ultraviolet light and titanium dioxide, electron-hole pairs can be generated, thereby decomposing the organic matter in the paint spraying exhaust gas into carbon dioxide and water.

[0037] Specifically, the purification catalytic plate 330 has several honeycomb through-holes, which further control the gas flow and create a pressure reduction effect. The purification catalytic plate 330 itself has a large specific surface area and a through-hole structure, serving both as the final airflow equalization element and as a carrier for the photocatalytic reaction. Without significantly increasing the system pressure drop or space requirements, it achieves deep mineralization treatment of trace pollutants in the circulating air, further improving the overall purification level and air quality assurance capability of the entire system, making it particularly suitable for applications with extremely high requirements for the air quality of the working environment.

[0038] It is understood that a jet seat 270 is provided between the rear water curtain plate 260 and the front water curtain plate 250. The rear water curtain plate 260 is provided with multiple jet clearance holes 261. The jet seat 270 is provided with a gas collection chamber 271. The jet seat 270 is provided with a vent pipe 280 that connects to the gas collection chamber 271. Multiple jet heads 290 are rotatably connected to one side of the jet seat 270 and are respectively inserted into the corresponding jet clearance holes 261. The jet head 290 is provided with a rotating jet channel 291. One end of the rotating jet channel 291 is connected to the gas collection chamber 271 through a jet hole. The rotating jet channel 291 extends in a spiral shape. When the gas moves along the axis of the jet head 290, it can form a circumferential thrust on the inner wall of the rotating jet channel 291, thereby causing the jet head 290 to rotate. The rotating jet head 290 can rotate and spray the liquid on the surface of the rear water curtain plate 260, which can form a fine spray effect of droplets and further carry away the paint dispersed in the paint spraying exhaust gas through the liquid.

[0039] An active, dynamic gas-liquid interaction enhancement mechanism is introduced through the jet head 290 installed on the rear water curtain plate 260. Utilizing the kinetic energy of the airflow itself, the jet head 290 rotates, transforming the airflow ejected from the jet holes from a static direct current into a high-speed rotating vortex. When this rotating airflow enters the water curtain on the surface of the rear water curtain plate 260, it generates strong shearing and tearing effects, shattering the water curtain into numerous fine droplets, thus forming a highly dispersed micro-water mist zone. Compared to a static water curtain, this dynamically generated micro-water mist has a larger total specific surface area and a higher degree of turbulence, enabling it to more effectively contact, collide, and adsorb the paint mist exhaust gas rising through the water curtain box 200. This significantly improves the collection efficiency of fine paint mist particles that penetrate the front water curtain and are dispersed in the airflow, further enhancing the adsorption and separation effect.

[0040] Understandably, the top of the waste liquid purification tank 500 is equipped with an exhaust gas pipe 510. The end of the exhaust gas pipe 510 furthest from the waste liquid purification tank 500 is connected to a combustion furnace 600. The waste liquid purification tank 500 contains degrading microorganisms. During the degradation of the waste liquid by these microorganisms, the generated gas passes through the exhaust gas pipe 510 and reaches the combustion furnace 600. The outlet of the combustion furnace 600 is connected to the end of a vent pipe 280 away from the jet nozzle 270. The vent pipe 280 is equipped with a jet filter 281 and a jet pump 282. The gas is then pumped through the jet nozzle. The filter 281 ensures the cleanliness of the gas output from the jet seat 270 and the jet head 290. In addition, the jet pump 282 ensures the flow rate of the gas in the vent pipe 280, effectively increasing the kinetic energy of the gas output from the jet head 290, thereby effectively increasing the amount of paint dispersed in the paint spray exhaust gas that can be carried away by the spray. The paint spray exhaust gas treatment effect is good. Moreover, the gas resources are recycled by using filtration and recovery, which not only saves raw material costs but also reduces sewage discharge costs, making it environmentally friendly and energy-saving.

[0041] It should be further explained that the vent pipe 280 passes through the overflow box 230. The gas discharged from the combustion furnace 600 can exchange heat with the liquid in the overflow box 230 through the vent pipe 280. This not only increases the temperature of the liquid in the overflow box 230, but also allows the uniformly heated liquid to pass through the overflow guide plate 231 and the overflow trough 241 to reach the front water curtain plate 250 and the rear water curtain plate 260 respectively. This can effectively improve the absorption and carrying efficiency of the water curtain for paint in the paint spraying exhaust gas, and effectively improve the purification efficiency. It can also reduce the temperature of the gas in the gas collection chamber 271 output from the vent pipe 280. Along the direction of gas flow in the vent pipe 280, the jet filter 281 and the jet pump 282 are located behind the overflow box 230. The cooled gas is then filtered by the paint spraying filter, which can effectively reduce the workload of the paint spraying filter and effectively extend the service life of the paint spraying filter and the jet pump.

[0042] The microbial degradation process in the waste liquid purification tank 500 is coupled with the air supply system of the rotary jet head 290 and the liquid preheating of the overflow box 230 to construct a multi-stage synergistic loop for energy and material recovery. The biological waste gas generated in the waste liquid purification tank 500 is introduced into the combustion furnace 600 and converted into heat energy, which can purify the biological waste gas. The heat energy enters the ventilation pipe 280 in the form of high-temperature gas. When the high-temperature gas flows through the ventilation pipe 280 section immersed in the overflow box 230, it first undergoes efficient heat exchange with the internal circulating water in the overflow box 230 to preheat the liquid that is about to form a water curtain. This can effectively increase the liquid temperature, reduce its surface tension and viscosity, which is conducive to forming a more uniform water curtain and improving the wetting and dissolving efficiency of the paint. After the heat exchange, the cooled gas then passes through the jet filter 281 and the jet pump 282 in sequence. The low temperature condition reduces the workload of the filter, extends its service life, and ensures the operational reliability of the jet pump 282. Ultimately, the clean and appropriately heated gas drives the jet head 290 to work, fulfilling its functional mission. The system as a whole has high energy efficiency and high resource utilization.

[0043] Understandably, a liquid delivery pipe 520 is provided on one side of the waste liquid purification tank 500. A clear liquid storage tank 530 is provided at the end of the liquid delivery pipe 520 away from the waste liquid purification tank 500. A liquid supply pipe 540 is connected to the bottom of the clear liquid storage tank 530. The end of the liquid supply pipe 540 away from the clear liquid storage tank 530 is located above the overflow box 230, that is, the outlet of the liquid supply pipe 540 is located above the overflow box 230. A liquid filter 550 is provided in the clear liquid storage tank 530. The liquid filter 550 is located above the inlet of the liquid supply pipe 540. The liquid filter 550 can be a zeolite filter. The liquid supply pipe 540 is equipped with a liquid supply pump 541. The liquid supply pump 541 can ensure a stable liquid supply in the overflow box 230. The liquid resources are recycled by filtration and recovery, which can not only save raw material costs, but also reduce sewage discharge costs, and is environmentally friendly and energy-saving.

[0044] The closed-loop liquid treatment circuit formed between the waste liquid purification tank 500, the clarified liquid storage tank 530, and the overflow box 230 enables sustainable water resource utilization and zero wastewater discharge. After the waste liquid is degraded by microorganisms in the purification tank, the supernatant enters the clarified liquid storage tank 530 through the delivery pipe 520. The liquid filter 550 installed in the clarified liquid storage tank 530 performs deep filtration on the clarified water, effectively removing residual suspended solids, colloids, and some dissolved organic matter, ensuring that the water quality meets the requirements for reuse. Subsequently, driven by the liquid supply pump 541, the purified clarified water is transported back to the overflow box 230 as a supplementary water source for forming the water curtain. The above water circulation circuit not only greatly reduces the consumption of fresh process water and wastewater discharge, reducing operating costs and environmental burden; through continuous circulation purification and reuse, it avoids frequent fluctuations in temperature and water quality caused by the use of fresh water in the water curtain system, maintaining the long-term stability of the water curtain performance, and effectively avoids system corrosion, blockage, or odor that may be caused by the accumulation of pollutants in the circulating water.

[0045] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A waste gas separation and treatment device for a paint spraying workshop, characterized in that... The system includes a spray booth (100), a water curtain box (200), a pressure equalization box (300), and an air filter box (400). The spray booth (100) is equipped with a spray painting robot (110). A water collection tank (120) is located at the bottom of the spray booth (100). The water curtain box (200) is connected to one side of the spray booth (100). The pressure equalization box (300) is connected to the top of the spray booth (100). The inlet of the air filter box (400) is connected to the top of the air filter box (400) via a circulating air intake pipe (410). The outlet of the air filter box (400) is connected to the inlet of the pressure equalization box (300) via a circulating exhaust pipe (420). A circulating air pump (421) is connected between the outlet of the air filter box (400) and the circulating exhaust pipe (420). The water curtain box (200) is equipped with a gas-liquid separation plate assembly (210). A dehumidifying filter plate (220) is located on the top of the water curtain box (200). An overflow box (230) is located on the side of the dehumidifying filter plate (220) closest to the paint booth (100). An overflow guide plate (231) is located on one side of the overflow box (230). A water curtain top plate (240) is located below the overflow guide plate (231). The water curtain top plate (240) is located near... The spray booth (100) has a front water curtain plate (250) on one side, and a rear water curtain plate (260) on the side of the water curtain top plate (240) near the water curtain box (200). An overflow trough (241) is provided at the center of the water curtain top plate (240). A waste liquid tank (201) connected to the water collection tank (120) is provided at the bottom of the water curtain box (200). A waste liquid purification pool (500) is connected to one side of the waste liquid tank (201).

2. The waste gas separation and treatment equipment for a paint spraying workshop according to claim 1, characterized in that... The gas-liquid separation plate assembly (210) includes a rear guide plate (211), an inclined separation plate (212), a closed-loop diverter (213), and a diverter baffle (214) arranged sequentially from bottom to top. The rear guide plate (211) is connected to the bottom of the rear water curtain plate (260). The rear guide plate (211) is inclined from top to bottom away from the rear water curtain plate (260). A gap is formed between the rear guide plate (211) and the back plate of the water curtain box (200). The inclined separation plate (212) is inclined from top to bottom close to the rear water curtain plate (260). A gap is formed between the inclined separation plate (212) and the rear water curtain plate (260).

3. The waste gas separation and treatment equipment for a paint spraying workshop according to claim 2, characterized in that... The gas-liquid separation plate assembly (210) further includes three sets of flow collecting plates (215). The flow collecting plates (215) are provided between the inclined separation plate (212) and the closed-loop flow divider (213). The flow collecting plates (215) are also provided between the closed-loop flow divider (213) and the flow divider baffle (214). The flow collecting plates (215) are also provided above the flow divider baffle (214).

4. A waste gas separation and treatment device for a paint spraying workshop according to claim 2 or 3, characterized in that... The closed-loop diverter (213) has a hexagonal cross-section. The bottom of the closed-loop diverter (213) is provided with a diverter inlet (216), and the top of the closed-loop diverter (213) is provided with a diverter exhaust (217). The horizontal projections of the diverter inlet (216) and the diverter exhaust (217) are separated.

5. The waste gas separation and treatment equipment for a paint spraying workshop according to claim 1, characterized in that... The air filter box (400) is provided with a first air filter (430), a second air filter (440) and a cooling pipe (450). The second air filter (440) and the first air filter (430) are arranged sequentially on the side of the cooling pipe (450) near the circulating air intake pipe (410).

6. The waste gas separation and treatment equipment for a paint spraying workshop according to claim 1, characterized in that... The equalizing chamber (300) is provided with a dispersing plate (310), the dispersing plate (310) is directly opposite the inlet of the equalizing chamber (300), and the outlet of the equalizing chamber (300) is provided with an equalizing filter (320).

7. The waste gas separation and treatment equipment for a paint spraying workshop according to claim 6, characterized in that... A purification catalyst plate (330) is provided above the pressure equalizing filter (320), and an ultraviolet lamp group (340) is provided in the pressure equalizing box (300).

8. The waste gas separation and treatment equipment for a paint spraying workshop according to claim 1, characterized in that... A jet seat (270) is provided between the rear water curtain plate (260) and the front water curtain plate (250). The rear water curtain plate (260) is provided with multiple jet clearance holes (261). The jet seat (270) is provided with an air collection chamber (271). The jet seat (270) is provided with a vent pipe (280) that communicates with the air collection chamber (271). A plurality of jet heads (290) are rotatably connected to one side of the jet seat (270) and are respectively inserted into the corresponding jet clearance holes (261). The jet head (290) is provided with a rotating jet channel (291). One end of the rotating jet channel (291) is connected to the air collection chamber (271).

9. The waste gas separation and treatment equipment for a paint spraying workshop according to claim 8, characterized in that... The top of the waste liquid purification tank (500) is provided with a waste gas pipe (510). The end of the waste gas pipe (510) away from the waste liquid purification tank (500) is connected to a combustion furnace (600). The outlet of the combustion furnace (600) is connected to the ventilation pipe (280). The ventilation pipe (280) is provided with a jet filter (281) and a jet pump (282).

10. The waste gas separation and treatment equipment for a paint spraying workshop according to claim 1, characterized in that... A delivery pipe (520) is provided on one side of the waste liquid purification tank (500). A clear liquid storage tank (530) is provided at the end of the delivery pipe (520) away from the waste liquid purification tank (500). A supply pipe (540) is connected to the bottom of the clear liquid storage tank (530). The end of the supply pipe (540) away from the clear liquid storage tank (530) is located above the overflow box (230). A liquid filter (550) is provided in the clear liquid storage tank (530). A supply pump (541) is provided in the supply pipe (540).

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