A furniture paint purification device

Abstract

This invention discloses a furniture spray painting purification device, belonging to the technical field of spray painting purification equipment. It includes a housing, inside which a purification module is fixed. The purification module includes a pre-processor, a purification tower, and a terminal purification unit. The purification tower contains a condensation unit and a coaxial rotating condensing demister. The pre-processor includes an anti-adhesion chamber, with paint mist inlet flanges and paint mist exhaust flanges fixed at both ends. A circulation chamber is integrally formed at the bottom of the anti-adhesion chamber, and the bottom of the circulation chamber is connected to a first circulation pump via a flange. Multiple atomizing nozzles are fixed at the top inner side of the anti-adhesion chamber, and the first circulation pump is connected to the liquid inlet of the atomizing nozzles via a pipe assembly. The paint mist inlet flange is connected to an air intake fan outside the housing. This furniture spray painting purification device, through anti-adhesion, condensation, centrifugal detachment, condensation demister, and terminal purification, can achieve efficient and thorough purification of furniture spray painting.

Description

Technical Field

[0001] This invention specifically relates to a furniture spray painting purification device, belonging to the technical field of spray painting purification equipment. Background Technology

[0002] In the furniture manufacturing industry, after painting, the confined spray booth often contains a large amount of suspended paint in the air. When painting other products, this suspended paint may come into contact with their surfaces, resulting in uneven paint color, reduced painting quality, and rough paint surfaces. Simply spraying water mist to remove the suspended paint is insufficient because the high air pressure from the spray gun during painting causes the suspended paint to disperse widely, making it difficult to completely eliminate it. Furthermore, the air contains a large amount of paint mist particles and volatile organic compounds (VOCs), with a wide particle size distribution, a high proportion of submicron particles (0.1-5μm), and strong adhesion. This not only pollutes the atmosphere but also harms the health of operators. Therefore, spray booth purification is necessary. Purification equipment, such as the furniture spray painting purification device disclosed in Chinese Patent Publication No. CN106110801B, includes a base plate and a rectangular shell disposed on the base plate. Air inlets and outlets are respectively provided on the left and right side walls of the shell. A partition is vertically fixed inside the shell, dividing the inner cavity of the shell into independent left and right cavities. A long, narrow water passage runs through the partition vertically. The partition also has an air passage unit that connects the left and right cavities. This device has the advantage of good dust removal effect. However, in existing spray painting purification equipment, paint mist easily adheres to the inner walls of the equipment, pipes, and the surface of the demisting elements during purification, leading to equipment blockage, increased resistance, and a significant increase in maintenance frequency and cost. During purification, most equipment uses water curtain purification, which generates a large amount of wastewater, and the submicron paint mist in the airflow cannot be fully removed, resulting in large fluctuations in treatment effect and difficulty in meeting environmental emission requirements. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a furniture paint purification device that sequentially performs de-adhesion, coagulation, centrifugal detachment, coagulation demisting, and end-point purification, enabling efficient and thorough purification of furniture paint.

[0004] The furniture paint purification device of the present invention includes a housing, wherein a purification module is fixed inside the housing, and the purification module includes: The pre-processor includes a bracket, on which an anti-sticking chamber is fixed. Paint mist inlet flanges and paint mist exhaust flanges are fixed at both ends of the anti-sticking chamber. A circulation chamber is integrally formed at the bottom of the anti-sticking chamber, and the bottom of the circulation chamber is connected to a first circulation pump via a flange. Multiple atomizing nozzles are fixed to the top inner side of the anti-sticking chamber. The first circulation pump is connected to the liquid inlet end of the atomizing nozzles via a pipe assembly. The paint mist inlet flange is connected to an air intake fan outside the housing. The purification tower is a tubular structure, with its bottom fixed to a storage tank; a purification inlet flange connected to a paint mist exhaust flange is fixed at the bottom of the purification tower, and a purification exhaust flange is fixed at the top of the purification tower. The condensation unit includes an annular atomizing nozzle group fixed inside the purification tower and disposed above the purification inlet flange, and a reverse atomizing nozzle group fixed at the center above the annular atomizing nozzle group; the annular atomizing nozzle group and the reverse atomizing nozzle group are connected to the storage tank through a second circulation pump. A coaxial rotary condensing demister is mounted above a condensation unit via an internal support. The demister includes a main shaft, one end of which is connected to the internal support via a bearing, and the other end is connected to a demister motor outside the purification tower via a coupling. A centrifugal impeller is fixed to the lower section of the main shaft, and a condensing demister is fixed to the upper section. The demister includes multiple condensing discs with radially arranged fan-shaped air holes. Short polytetrafluoroethylene (PTFE) fiber bundles are fixed to the top surface of each condensing disc. A collection trough is fixed to the bottom surface of the condensing discs and the bottom surface of the centrifugal impeller on the inner wall of the purification tower. The collection trough is connected to a filter via a pipe assembly, and the bottom of the filter is connected to a storage tank. The terminal purification unit is a photocatalytic purification unit. The input end of the photocatalytic purification unit is connected to the purified exhaust flange, and the output end of the photocatalytic purification unit is provided with a terminal exhaust pipe.

[0005] The working process of the furniture spray painting purification equipment of the present invention is as follows: The intake fan sends the exhaust gas containing paint mist into the housing through the exhaust gas inlet and guides it into the purification module. The exhaust gas first enters the pre-processor. The first circulation pump works continuously, sending the de-adhesive in the circulation chamber into each atomizing nozzle. The atomized de-adhesive fills the entire de-adhesive chamber through the atomizing nozzle. Excess de-adhesive drips back into the circulation chamber, waiting for the next spray. The exhaust gas and the atomized de-adhesive fully contact each other, de-adhesing the paint mist in the exhaust gas. Then, the exhaust gas continues to move forward and enters the lower inner part of the purification tower. The annular atomizing nozzle group and the reverse atomizing nozzle group cooperate to fill the lower inner part of the purification tower with coagulant, specifically: Compressed air and coagulant mix inside the nozzles of the annular atomizing nozzle group, producing a uniform micro-mist with a particle size of 20-50μm. The nozzles employ a fan-shaped spray pattern with a spray angle of 45°, and the overlap rate of the mist fields between adjacent nozzles is controlled at 15%-20%. A reverse atomizing nozzle group is added above the center of the annular atomizing nozzle group, with its nozzles spraying downwards to create an upward-downward spray mist field, eliminating dead zones in the airflow. The de-adhesive exhaust gas comes into full counter-current contact with the atomized coagulant, causing the paint mist particles to condense and enlarge. Excess coagulant drips back into the storage tank. The condensed paint mist then enters the coaxial rotating condensing demister area with the airflow, where the demister motor activates, driving the main shaft to rotate. This drives the condenser and condensation disc to rotate synchronously. The condensed paint mist first contacts the high-speed rotating centrifugal impeller. Through the powerful centrifugal force of the impeller, large paint mist flocculent particles (>5μm) are thrown towards the tower wall and fall down to the collection tank. After centrifugal separation, the remaining airflow containing 0.1-5μm submicron paint mist continues to flow upward to the condenser. When the condenser is working, the condensation disc carries bundles of polytetrafluoroethylene (PTFE) short fibers and rotates at high speed. When the airflow passes vertically through the high-speed rotating radial fan-shaped air holes, the submicron paint mist particles cannot bypass the PTFE short fiber bundles and directly collide with them. The paint mist particles are intercepted by short polytetrafluoroethylene (PTFE) fiber bundles. These particles accumulate on the surface of the PTFE fiber bundles, forming small droplets. Due to the high-speed rotation of the condensation disc, the strong centrifugal force completely ejects the paint mist droplets from the PTFE fiber bundles. The droplets fly towards the tower wall and fall along the wall into the collection tank. The paint liquid in the collection tank is introduced into the pipe assembly through the bottom return holes and flows into the filter. The filter traps the flocculation layer, and the filtered coagulant re-enters the storage tank. Finally, the remaining organic waste gas enters the photocatalytic purification unit, where it is catalytically degraded into carbon dioxide and water by titanium dioxide under ultraviolet light. The clean gas is then discharged from the terminal exhaust pipe.

[0006] Furthermore, the photocatalytic purification unit includes a photocatalytic degradation chamber, inside which multiple catalytic degradation units are stacked. Each catalytic degradation unit includes a straight cylinder, on the top surface of which a porous ceramic plate loaded with titanium dioxide is fixed. Multiple rows of straight holes are spaced apart on the straight cylinder. Multiple irradiation units are fixed on the outer wall of the photocatalytic degradation chamber. Each irradiation unit includes a main pipe, on which a row of branch pipes is fixed, and the branch pipes communicate with the top of the catalytic degradation unit. The top of the main pipe is closed, and an ultraviolet lamp is fixed at the bottom. The top of the photocatalytic degradation chamber is connected to a purification exhaust flange, and the terminal exhaust pipe is connected to the bottom of the photocatalytic degradation chamber.

[0007] The ultraviolet lamp provides the ultraviolet light source, which is distributed to various branch pipes through the main pipe. The branch pipes evenly and comprehensively distribute the ultraviolet light source onto the porous ceramic plate. The porous ceramic plate has a pore size of 3mm, a porosity of 70%, and a titanium dioxide coating thickness of 30μm. Under the irradiation of the ultraviolet lamp, the titanium dioxide is excited to generate electron-hole pairs, which react with water and oxygen in the air to generate hydroxyl radicals and superoxide ions with strong oxidizing properties. When the photocatalytic purification unit is working, the clean airflow is injected into the photocatalytic degradation chamber through the purification exhaust flange. When the airflow passes through the porous ceramic plate loaded with titanium dioxide, the trace active substances in the clean airflow can completely degrade the residual organic waste gas into carbon dioxide and water, which are finally discharged from the terminal exhaust pipe.

[0008] Furthermore, an electrostatic adsorption device is connected in series between the purified exhaust flange and the photocatalytic purification unit; multiple sets of parallel-arranged anode plates and cathode wires are fixed inside the electrostatic adsorption device. Clean airflow is first injected into the electrostatic adsorption device through the purified exhaust flange, where the anode plates and cathode wires work together to adsorb and trap trace amounts of paint mist residue, and finally sent to the photocatalytic purification unit for final treatment.

[0009] Furthermore, the output end of the de-adhesion chamber has a narrowed diameter structure, which facilitates the return of the de-adhesion agent to the circulation chamber.

[0010] Furthermore, a replenishing valve is provided on the upper part of the circulation chamber and the storage tank, through which anti-adhesion agent and coagulant are periodically replenished into the circulation chamber and the storage tank.

[0011] Furthermore, the radial fan-shaped pores of adjacent condensation discs are staggered.

[0012] Furthermore, a rectifier grid is fixed on the inner side of the purification tower above the condenser demister. The airflow has a certain degree of rotation before entering the rectifier grid, and the rectifier grid straightens the rotating airflow into a uniform and smooth airflow.

[0013] Furthermore, the inner wall of the purification tower and the blade surface of the centrifugal impeller are coated with a hydrophobic polytetrafluoroethylene coating. The hydrophobic polytetrafluoroethylene coating can prevent paint residue from adhering to the inner wall of the purification tower and the blade of the centrifugal impeller, while allowing the condensed paint droplets to quickly detach from the inner wall of the purification tower and the blade surface of the centrifugal impeller, so that the paint droplets can be smoothly guided into the collection tank.

[0014] Furthermore, the polytetrafluoroethylene short fiber bundle is fixed on the spoke, the spoke is fixed on the top surface of the condensation disk, and is disposed between radial fan-shaped pores; the polytetrafluoroethylene short fiber bundle has a fiber diameter of 80 μm and a fiber length of 12 mm; The centrifugal impeller rotates at high speed, generating an upward suction force. The airflow, after primary centrifugal separation, enters the condenser demister in a rotating, upward-moving state (angular velocity close to that of the impeller). The airflow first reaches the lower surface of the lower condenser disc. Then, the airflow passes through the radial fan-shaped vents of the condenser disc. Unable to pass through the solid flanges and spokes, the airflow can only flow upwards through the radial fan-shaped vents with a coverage of 60%-70%. As the airflow passes through the radial fan-shaped vents, it encounters the high-speed rotating polytetrafluoroethylene (PTFE) short fiber bundles on the upper surface. The fiber bundles, with a linear velocity of 50-60 km / h, transversely cut the vertically upward airflow. Submicron paint mist particles collide with the fibers due to inertia and are adhered to the surface of the PTFE short fiber bundles. The airflow rotates and rises in the space between the two condenser discs, passing through... The airflow from the lower condensation plate enters the 150-200mm gap between the upper and lower condensation plates. The airflow continues to rotate in the gap, making full contact with the fiber bundles on the upper surface of the lower condensation plate. Particles not captured by the lower condensation plate are captured by the polytetrafluoroethylene short fiber bundles of the upper condensation plate. The airflow passes through the radial fan-shaped pores of the upper condensation plate, and the process is exactly the same as that of the lower condensation plate. The airflow is cut and captured by the fiber bundles of the upper layer again. After multiple captures by multiple condensation plates, submicron paint mist and flocculant droplets are completely removed. The airflow enters the rectifier grid. The airflow passing through the uppermost condensation plate still has a certain degree of rotation. The rectifier grid (honeycomb structure) straightens the rotating airflow into a uniform and smooth airflow, and finally smoothly enters the photocatalytic purification unit.

[0015] Furthermore, a turntable is fixed at the bottom of the main shaft, and multiple wavy metal wires are fixed on the outer periphery of the turntable; when the airflow carrying fine flocculant droplets passes through the rotating metal wires, the wavy structure generates a large number of micro vortices, which further enhances the collision and coagulation of paint mist and flocculant, shortens the flocculation reaction time, and improves the utilization rate of the agent.

[0016] Compared with the prior art, the furniture spray painting purification equipment of the present invention has the following advantages: 1. Pre-treatment to prevent sticking and blockage, clearing obstacles for subsequent purification: Through circulating atomization spray, an atomization zone for the anti-sticking agent is established in the anti-sticking chamber to fully destroy the stickiness of the paint mist; combined with the narrowing and reflux of the anti-sticking chamber, the anti-sticking agent can be recycled, which can prevent paint mist from adhering to the inner wall of the equipment and pipes from the source, and prevent equipment blockage and the problem of easy contamination and failure of the end purification unit.

[0017] 2. Enhanced condensation without dead angles for efficient demisting: Annular and reverse atomizing nozzles form a fully covered mist field, which, combined with the micro-vortex generated by the wave-shaped metal wire disc at the bottom of the main shaft, allows the paint mist and coagulant to fully collide and condense into large particles. Then, a coaxially driven centrifugal impeller and condenser demister remove particles larger than 5μm. The multi-layered staggered condensation disc drives PTFE fiber bundles to cut the airflow at high speed, capturing submicron particles of 0.1-5μm. The high-speed centrifugal force automatically detaches paint droplets, achieving self-cleaning. A hydrophobic PTFE coating further prevents paint residue adhesion, ensuring real-time purification efficiency.

[0018] 3. Pre-treatment purification reduces the burden and ensures that the final depth meets the standards: After the airflow is treated with high-efficiency demisting in the pre-treatment stage, there is almost no paint mist residue. After entering the photocatalytic purification unit, the residual VOCs are completely degraded through distributed ultraviolet irradiation and a titanium dioxide porous ceramic plate.

[0019] 4. Full-process reagent recycling, balancing adaptability and low cost: The de-sticking agent is continuously circulated and atomized, and the coagulant is recycled through filtration, which greatly reduces the amount of solid waste generated. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the furniture spray painting purification equipment of the present invention.

[0021] Figure 2 This is a schematic diagram of the overall structure of the purification module in Embodiment 1 of the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the purification tower in Embodiment 1 of the present invention.

[0023] Figure 4 This is a schematic diagram of the condensation disk structure of the present invention.

[0024] Figure 5 This is a schematic diagram of the internal structure of the photocatalytic purification unit of the present invention.

[0025] Figure 6 This is a schematic diagram of the overall structure of the purification module in Embodiment 2 of the present invention.

[0026] Figure 7 This is a schematic diagram of the internal structure of the purification tower in Embodiment 3 of the present invention.

[0027] Reference numerals: 1. Housing; 2. Support frame; 3. De-sticking chamber; 4. Paint mist inlet flange; 5. Paint mist exhaust flange; 6. Circulation chamber; 7. First circulation pump; 8. Inlet fan; 9. Purification tower; 10. Accumulator; 11. Purification inlet flange; 12. Purification exhaust flange; 13. Annular atomizing nozzle assembly; 14. Reverse atomizing nozzle assembly; 15. Second circulation pump; 16. Main shaft; 17. Demisting motor; 18. Centrifugal impeller; 19. 20. Condensation plate, 21. Radial fan-shaped vents, 22. Polytetrafluoroethylene short fiber bundles, 23. Collection trough, 24. Filter, 25. Photocatalytic purification unit, 26. Terminal exhaust pipe, 27. Photocatalytic degradation chamber, 28. Straight cylinder, 29. Porous ceramic plate, 30. Straight hole, 31. Main pipe, 32. Branch pipe, 33. Ultraviolet lamp, 34. Electrostatic adsorption device, 35. Liquid replenishment valve, 36. Rectifying grid, 37. Turntable, 38. Metal wire. Detailed Implementation

[0028] Example 1: like Figures 1 to 5 The furniture painting purification equipment shown includes a housing 1, inside which a purification module is fixed. The purification module includes: The pre-processor includes a bracket 2, on which an anti-adhesion chamber 3 is fixed. Paint mist inlet flange 4 and paint mist exhaust flange 5 are fixed at both ends of the anti-adhesion chamber 3. A circulation chamber 6 is integrally formed at the bottom of the anti-adhesion chamber 3. The bottom of the circulation chamber 6 is connected to a first circulation pump 7 via a flange. Multiple atomizing nozzles are fixed to the top inner side of the anti-adhesion chamber 3. The first circulation pump 7 is connected to the liquid inlet end of the atomizing nozzles via a pipe assembly. The paint mist inlet flange 4 is connected to an air intake fan 8 outside the housing 1. Purification tower 9 is a tubular structure, and the bottom of purification tower 9 is fixed to storage tank 10; purification inlet flange 11 connected to paint mist exhaust flange 5 is fixed at the lower part of purification tower 9, and purification exhaust flange 12 is fixed at the top of purification tower 9. The condensation unit includes an annular atomizing nozzle group 13 fixed inside the purification tower 9 and disposed above the purification inlet flange 11, and a reverse atomizing nozzle group 14 fixed at the center above the annular atomizing nozzle group 13; the annular atomizing nozzle group 13 and the reverse atomizing nozzle group 14 are connected to the storage tank 10 through a second circulation pump 15. A coaxial rotary condensing demister is mounted above a condensing unit via an internal support. The demister includes a main shaft 16, one end of which is mounted to the internal support via a bearing, and the other end is connected to a demister motor 17 outside the purification tower 9 via a coupling. A centrifugal impeller 18 is fixed to the lower section of the main shaft 16, and a condensing demister is fixed to the upper section. The condensing demister includes multiple condensing discs 19, each with radially arranged fan-shaped air holes 20. A bundle of polytetrafluoroethylene (PTFE) short fibers 21 is fixed to the top surface of each condensing disc 19. A collection trough 22 is fixed to the bottom surface of the condensing discs 19 and the bottom surface of the centrifugal impeller 18 on the inner wall of the purification tower 9. The collection trough 22 is connected to a filter 23 via a pipe assembly, and the bottom of the filter 23 is connected to a storage tank 10. The main shaft 16 is vertically oriented... Above, it is coaxially arranged with the purification tower 9; the centrifugal impeller 18 and the condenser demister share a main shaft 16 with the same rotation speed. The main shaft 16 is a stainless steel round shaft with a diameter of 30-50mm. There are 2-3 condenser plates 19 arranged in parallel. The condenser plate 19 is a circular stainless steel disc with a thickness of 2-3mm. The diameter of the condenser plate 19 is 10-30mm smaller than the inner diameter of the tower body. The distance between the upper and lower condenser plates 19 is 150-200mm. The center of the condenser plate 19 is a solid flange connected to the main shaft 16. The radial fan-shaped air holes 20 are opened in the following manner: 12-16 evenly distributed radial fan-shaped holes are opened from the outer edge of the flange outward. The opening rate is 60%-70% to avoid excessive airflow resistance. The opening width gradually increases from the inside to the outside, with an inner width of 10mm and an outer width of 30mm. The fan-shaped opening is the gap between the spokes. The terminal purification unit is a photocatalytic purification unit 24. The input end of the photocatalytic purification unit 24 is connected to the purification exhaust flange 12, and the output end of the photocatalytic purification unit 24 is provided with a terminal exhaust pipe 25.

[0029] The working process of the furniture spray painting purification equipment of the present invention is as follows: The intake fan 8 sends the exhaust gas containing paint mist into the housing 1 through the exhaust gas inlet and introduces it into the purification module. The exhaust gas first enters the pre-processor. The first circulation pump 7 works continuously, sending the de-adhesive in the circulation chamber 6 into each atomizing nozzle. The atomized de-adhesive fills the entire de-adhesive chamber 3 through the atomizing nozzle. Excess de-adhesive drips back into the circulation chamber 6, waiting for the next spray. The exhaust gas and the atomized de-adhesive fully contact each other to de-adhere the paint mist in the exhaust gas. Then, the exhaust gas continues to move forward and enters the lower inner part of the purification tower 9. The annular atomizing nozzle group 13 and the reverse atomizing nozzle group 14 cooperate to fill the lower inner part of the purification tower 9 with a coagulant, specifically: compressed air. The paint mist mixes with the coagulant inside the nozzles of the annular atomizing nozzle group 13, producing a uniform micro-mist with a particle size of 20-50 μm. The nozzles employ a fan-shaped spray pattern with a spray angle of 45°, and the overlap rate of the mist fields between adjacent nozzles is controlled at 15%-20%. A reverse atomizing nozzle group 14 is added above the center of the annular atomizing nozzle group 13. The nozzles of the reverse atomizing nozzle group 14 spray downwards, forming an upward and downward spray mist field to eliminate dead zones in the airflow. The de-adhesive exhaust gas comes into full counter-current contact with the atomized coagulant, causing the paint mist particles to agglomerate and enlarge. Excess coagulant drips back into the storage tank 10. The agglomerated paint mist enters the coaxial rotating condensing demister area with the airflow. The demister motor 17 actuates, driving the main shaft 16 to rotate, thereby driving the condensing demister... The mist collector and condensation disc 19 rotate centrifugally in sync. The condensed paint mist first contacts the high-speed rotating centrifugal impeller 18. Through the powerful centrifugal force of the impeller 18, large paint mist particles (>5μm) are thrown towards the tower wall and fall along the wall into the collection trough 22. After centrifugal separation, the remaining airflow containing 0.1-5μm submicron paint mist continues to flow upwards to the condensation demister. In operation, the condensation disc 19 rotates at high speed with polytetrafluoroethylene (PTFE) short fiber bundles 21. When the airflow passes vertically through the high-speed rotating radial fan-shaped air holes 20, the submicron paint mist particles cannot bypass the PTFE short fiber bundles 21 and directly collide with them, being absorbed by the PTFE. The polytetrafluoroethylene (PTFE) short fiber bundles 21 intercept the paint mist particles. These particles accumulate on the surface of the PTFE short fiber bundles 21, forming small droplets. Due to the high-speed rotation of the condensation disc 19, the strong centrifugal force completely throws the paint mist droplets off the PTFE short fiber bundles 21. The paint mist droplets fly towards the tower wall and fall down the wall to the collection tank 22. The paint liquid in the collection tank 22 is introduced into the pipe group through the bottom return hole and flows into the filter 23. The filter 23 intercepts the flocculation layer, and the filtered coagulant re-enters the storage tank 10. Finally, the residual organic waste gas enters the photocatalytic purification unit 24, where it is catalytically degraded into carbon dioxide and water by titanium dioxide under ultraviolet light. Finally, the clean gas is discharged from the terminal exhaust pipe 25.

[0030] Anti-sticking agents mainly consist of high-molecular-weight surfactants, organic amine compounds, and special additives; their function is to disrupt the surface tension and charge balance of paint mist particles, causing the paint droplets to lose their stickiness and preventing them from adhering to the inner walls of equipment and pipes. Coagulants mainly consist of a compound of high-molecular-weight polyacrylamide (PAM) and polyaluminum chloride (PAC); their function is to connect the de-adhesive, fine paint mist particles into large, dense flocculents through bridging adsorption. The appropriate type needs to be selected based on the specific paint mist composition. Oil-based paints (nitrocellulose lacquer, PU lacquer, PE lacquer): The main components of the anti-tack agent are organic amines and nonionic surfactants, and the main component of the coagulant is anionic PAM (molecular weight 8-12 million). It is suitable for traditional furniture spray painting workshops, with oil-based paint accounting for >80%. Water-based paints (acrylic water-based paints, water-based polyurethane paints): The main component of the anti-tack agent is a modified polymer, and the main component of the coagulant is non-ionic PAM (molecular weight 6-10 million). It is suitable for environmentally friendly furniture painting workshops, with water-based paint accounting for >80%. Mixed paint mist (oil-based and water-based): The main components of the anti-tack agent are organic amines and modified polymers, and the main components of the coagulant are cationic and anionic PAM. It is suitable for mixing new and old production lines, and the type of paint is not fixed. UV paint (ultraviolet curing paint): The main components of the detackifier are strong demulsifier and high molecular weight dispersant, and the main component of the coagulant is ultra-high molecular weight anionic PAM (12-16 million); it is suitable for high solids content and high viscosity UV paint spraying lines. When preparing the de-sticking agent and coagulant, the mass ratio should be 1:1 to 1:2 (1:1.5 for oil-based paint, 1:1 for water-based paint, and 1:2 for UV paint); the pH value of the circulating liquid should be controlled between 7.5 and 8.5, which can be adjusted by adding a small amount of sodium hydroxide or sulfuric acid; the temperature of the circulating liquid should be 15-35℃, as too low a temperature will reduce the flocculation effect.

[0031] The photocatalytic purification unit 24 includes a photocatalytic degradation chamber 26, on the inner side of which multiple catalytic degradation units are stacked. Each catalytic degradation unit includes a straight cylinder 27, on the top surface of which a porous ceramic plate 28 loaded with titanium dioxide is fixed. Multiple rows of straight holes 29 are spaced apart on the straight cylinder 27. Multiple irradiation units are fixed on the outer wall of the photocatalytic degradation chamber 26. Each irradiation unit includes a main pipe 30, on which a row of branch pipes 31 are fixed. The branch pipes 31 are connected to the top of the catalytic degradation unit. The top of the main pipe 30 is closed, and an ultraviolet lamp 32 is fixed at the bottom. The top of the photocatalytic degradation chamber 26 is connected to the purification exhaust flange 12, and the terminal exhaust pipe 25 is connected to the bottom of the photocatalytic degradation chamber 26.

[0032] The ultraviolet lamp 32 provides an ultraviolet light source, which is distributed to each branch pipe 31 through the main pipe 30. The branch pipes 31 evenly and comprehensively distribute the ultraviolet light source onto the porous ceramic plate 28. The porous ceramic plate 28 has a pore diameter of 3mm, a porosity of 70%, and a titanium dioxide coating thickness of 30μm. Under the irradiation of the ultraviolet lamp 32, the titanium dioxide is excited to generate electron-hole pairs, which react with water and oxygen in the air to generate hydroxyl radicals and superoxide ions with strong oxidizing properties. When the photocatalytic purification unit 24 is working, the clean airflow is injected into the photocatalytic degradation chamber 26 through the purification exhaust flange 12. When the airflow passes through the porous ceramic plate 28 loaded with titanium dioxide, the trace active substances in the clean airflow can completely degrade the residual organic waste gas into carbon dioxide and water, which are finally discharged from the terminal exhaust pipe 25.

[0033] Example 2: like Figure 6 The furniture painting purification equipment shown has an electrostatic adsorption device 33 connected in series between the purification exhaust flange 12 and the photocatalytic purification unit 24. The electrostatic adsorption device 33 has multiple sets of parallel anode plates and cathode wires fixed inside. The clean airflow is first injected into the electrostatic adsorption device 33 through the purification exhaust flange 12. Through the cooperation of the anode plates and cathode wires, the trace amount of paint mist residue is first adsorbed and intercepted, and then sent to the photocatalytic purification unit 24 for final treatment.

[0034] The output end of the de-adhesion chamber 3 has a narrowed diameter structure, which facilitates the return of the de-adhesion agent to the circulation chamber 6.

[0035] The circulation chamber 6 and the storage tank 10 are equipped with a liquid replenishment valve 34, through which anti-adhesion agent and coagulant are periodically replenished into the circulation chamber 6 and the storage tank 10.

[0036] The radial fan-shaped vents 20 of the adjacent condensation discs 19 are staggered.

[0037] The purification tower 9 has a rectifier grid 35 fixed on the inner side above the condenser demister. The airflow has a certain rotational property before entering the rectifier grid 35. The rectifier grid 35 rectifies the rotating airflow into a uniform and smooth airflow.

[0038] The inner wall of the purification tower 9 and the blade surface of the centrifugal impeller 18 are coated with a hydrophobic polytetrafluoroethylene coating. The hydrophobic polytetrafluoroethylene coating can prevent paint residue from adhering to the inner wall of the purification tower 9 and the blade surface of the centrifugal impeller 18, while allowing the condensed paint droplets to quickly detach from the inner wall of the purification tower 9 and the blade surface of the centrifugal impeller 18, so that the paint droplets can be smoothly guided into the collection tank 22.

[0039] The polytetrafluoroethylene short fiber bundle 21 is fixed on the spokes, which are fixed on the top surface of the condensation disk 19 and positioned between the radial fan-shaped pores 20; the polytetrafluoroethylene short fiber bundle 21 has a fiber diameter of 80 μm and a fiber length of 12 mm.

[0040] The centrifugal impeller 18 rotates at high speed, generating an upward suction force. The airflow, after primary centrifugal separation, enters the condenser demister in a rotating and rising state (angular velocity close to that of the impeller). The airflow first reaches the lower surface of the lower condenser plate 19. Then, the airflow passes through the radial fan-shaped vents 20 of the condenser plate 19. The airflow cannot pass through the solid flange and spokes, and can only flow upward through the radial fan-shaped vents 20 with a coverage of 60%-70%. When the airflow passes through the radial fan-shaped vents 20, it encounters the high-speed rotating polytetrafluoroethylene (PTFE) short fiber bundles 21 on the upper surface. The fiber bundles cut the vertically upward airflow laterally at a linear velocity of 50-60 km / h. Submicron paint mist particles collide with the fibers due to inertia and are stuck to the surface of the PTFE short fiber bundles 21. The airflow rotates and rises in the space between the two condenser plates 19, passing through the lower condenser plate. The airflow 19 enters the 150-200mm gap between the upper and lower condensation disks 19. The airflow continues to rotate in the gap and makes full contact with the fiber bundles on the upper surface of the lower condensation disk 19. Particles not captured by the lower condensation disk 19 are captured by the polytetrafluoroethylene short fiber bundles 21 of the upper condensation disk 19. The airflow passes through the radial fan-shaped air holes 20 of the upper condensation disk 19, and the process is exactly the same as that of passing through the lower condensation disk 19. The airflow is cut and captured by the upper fiber bundles again. After multiple captures by multiple condensation disks 19, the submicron paint mist and flocculant droplets are completely removed. The airflow enters the rectifier grid 35. The airflow passing through the uppermost condensation disk 19 still has a certain rotation. The rectifier grid 35 (honeycomb structure) rectifies the rotating airflow into a uniform and smooth airflow, and finally smoothly enters the photocatalytic purification unit 24.

[0041] Example 3: like Figure 7 The furniture spray painting purification equipment shown has a turntable 36 fixed at the bottom of the main shaft 16, and multiple wavy metal wires 37 fixed on the outer periphery of the turntable 36. When the airflow carrying fine flocculant droplets passes through the rotating metal wires 37, the wavy structure generates a large number of micro vortices, which further enhances the collision and coagulation of paint mist and flocculant, shortens the flocculation reaction time, and improves the utilization rate of the agent.

[0042] The above embodiments are merely preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention are included within the scope of the present invention.

Claims

1. A furniture paint spraying purification device, characterized in that: The system includes a housing, and a purification module is fixed inside the housing. The purification module includes: The pre-processor includes a bracket, on which an anti-sticking chamber is fixed. Paint mist inlet flanges and paint mist exhaust flanges are fixed at both ends of the anti-sticking chamber. A circulation chamber is integrally formed at the bottom of the anti-sticking chamber, and the bottom of the circulation chamber is connected to a first circulation pump via a flange. Multiple atomizing nozzles are fixed to the top inner side of the anti-sticking chamber. The first circulation pump is connected to the liquid inlet end of the atomizing nozzles via a pipe assembly. The paint mist inlet flange is connected to an air intake fan outside the housing. The purification tower is a tubular structure, with its bottom fixed to a storage tank; a purification inlet flange connected to a paint mist exhaust flange is fixed at the bottom of the purification tower, and a purification exhaust flange is fixed at the top of the purification tower. The condensation unit includes an annular atomizing nozzle group fixed inside the purification tower and disposed above the purification inlet flange, and a reverse atomizing nozzle group fixed at the center above the annular atomizing nozzle group; the annular atomizing nozzle group and the reverse atomizing nozzle group are connected to the storage tank through a second circulation pump. A coaxial rotary condensing demister is mounted above a condensation unit via an internal support. The demister includes a main shaft, one end of which is connected to the internal support via a bearing, and the other end is connected to a demister motor outside the purification tower via a coupling. A centrifugal impeller is fixed to the lower section of the main shaft, and a condensing demister is fixed to the upper section. The demister includes multiple condensing discs with radially arranged fan-shaped air holes. Short polytetrafluoroethylene (PTFE) fiber bundles are fixed to the top surface of each condensing disc. A collection trough is fixed to the bottom surface of the condensing discs and the bottom surface of the centrifugal impeller on the inner wall of the purification tower. The collection trough is connected to a filter via a pipe assembly, and the bottom of the filter is connected to a storage tank. The terminal purification unit is a photocatalytic purification unit. The input end of the photocatalytic purification unit is connected to the purified exhaust flange, and the output end of the photocatalytic purification unit is provided with a terminal exhaust pipe.

2. The furniture spray painting purification equipment according to claim 1, characterized in that: The photocatalytic purification unit includes a photocatalytic degradation chamber, inside which multiple catalytic degradation units are stacked. Each catalytic degradation unit includes a straight cylinder, on the top surface of which a porous ceramic plate loaded with titanium dioxide is fixed. Multiple rows of straight holes are spaced apart on the straight cylinder. Multiple irradiation units are fixed on the outer wall of the photocatalytic degradation chamber. Each irradiation unit includes a main pipe, on which a row of branch pipes is fixed, and the branch pipes communicate with the top of the catalytic degradation unit. The top of the main pipe is closed, and an ultraviolet lamp is fixed at the bottom. The top of the photocatalytic degradation chamber is connected to a purification exhaust flange, and the terminal exhaust pipe is connected to the bottom of the photocatalytic degradation chamber.

3. The furniture spray painting purification equipment according to claim 1, characterized in that: An electrostatic adsorption device is connected in series between the purified exhaust flange and the photocatalytic purification unit; multiple sets of parallel-arranged anode plates and cathode wires are fixed inside the electrostatic adsorption device.

4. The furniture spray painting purification equipment according to claim 1, characterized in that: The output end of the de-adhesion chamber has a reduced diameter structure.

5. The furniture spray painting purification equipment according to claim 1, characterized in that: The circulation chamber and the storage tank are equipped with a liquid replenishment valve at the top.

6. The furniture spray painting purification equipment according to claim 1, characterized in that: The radial fan-shaped pores of the adjacent condensation plates are staggered.

7. The furniture spray painting purification equipment according to claim 1, characterized in that: A flow-rectifying grid is fixed on the inner side of the purification tower above the condenser demister.

8. The furniture spray painting purification equipment according to claim 1, characterized in that: The inner wall of the purification tower and the surface of the centrifugal impeller blades are coated with a hydrophobic polytetrafluoroethylene coating.

9. The furniture spray painting purification equipment according to claim 1, characterized in that: The polytetrafluoroethylene short fiber bundle is fixed on the spoke, the spoke is fixed on the top surface of the condensation disk, and is arranged between radial fan-shaped pores; the polytetrafluoroethylene short fiber bundle has a fiber diameter of 80 μm and a fiber length of 12 mm.

10. The furniture spray painting purification equipment according to claim 1, characterized in that: A turntable is fixed to the bottom of the spindle, and multiple wavy metal wires are fixed to the outer periphery of the turntable.

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