A filter for air duct purification

Abstract

The application belongs to the technical field of air filtering equipment, and particularly relates to a filter for air pipeline purification, which comprises a cylindrical upper shell and a cylindrical lower shell, the opposite sides of the cylindrical upper shell and the cylindrical lower shell are fixedly connected with first flanges, the two first flanges are fixedly connected through bolts, the inner wall of the cylindrical upper shell is placed with an elliptical plate, the outer wall of the cylindrical upper shell is provided with two symmetrically distributed screw holes, and the hole walls of the screw holes are threadedly connected with limiting bolts. The filter has the functions of pre-condensation pre-water removal, double-cylinder alternating adsorption purification and active carbon online in-situ regeneration, can effectively solve the problems of quick saturation of active carbon of the existing adsorption filter, quick attenuation of purification effect, frequent disassembly and replacement of filter material, high operation and maintenance labor intensity and interruption of spraying production, can significantly improve the reliability and use convenience of continuous purification of the filter, reduce operation and maintenance cost, and guarantee long-term stable operation of an epoxy powder spraying production line.

Description

Technical Field

[0001] This invention belongs to the field of air filtration equipment technology, and in particular relates to a filter for purifying air ducts. Background Technology

[0002] In industrial production, epoxy powder coating requires compressed air as the core power medium, delivered by an air pump. This air is used to fluidize and atomize the epoxy powder, ensuring uniform coating formation and continuous operation. Because the atmosphere contains moisture, compressed air often carries water. If this moisture is introduced directly into the coating system without filtration, it can cause the epoxy powder to clump, clog supply lines and spray guns, and result in defects such as pinholes, blistering, and reduced adhesion in the cured coating. Therefore, a purification filter must be installed on the compressed air pipeline to meet the stringent requirements of epoxy powder coating regarding air dryness and cleanliness.

[0003] Existing compressed air pipeline purification systems mostly use adsorption filters, relying on activated carbon and hydrophobic adsorption filter media to remove impurities and moisture. However, these devices have significant shortcomings in long-term use: as the operating time increases, the adsorption filter media gradually reaches saturation due to continuous adsorption of water vapor, leading to a gradual decline in the water adsorption purification effect, and in severe cases, complete loss of purification capacity. The reliability of filtration decreases rapidly with the use time. In order to maintain the filtration effect, the staff needs to frequently disassemble the equipment to replace the adsorption filter element and filter media, which not only greatly increases the labor intensity of operation and maintenance, but also easily causes the interruption of spraying operations, reduces the ease of use of the filter and the continuity of production line operation, and is difficult to adapt to the needs of epoxy powder coating production lines that operate continuously for a long time.

[0004] Therefore, we propose a filter for air duct purification to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing a filter for purifying air ducts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a filter for purifying air ducts, comprising a cylindrical upper shell and a cylindrical lower shell, wherein a first flange is fixedly connected to one side of the cylindrical upper shell and the cylindrical lower shell respectively, and the two first flanges are fixedly connected by bolts; an elliptical plate is placed on the inner wall of the cylindrical upper shell; two symmetrically distributed screw holes are opened on the outer wall of the cylindrical upper shell, and the hole walls of the screw holes are threadedly connected to limit bolts; threaded holes that cooperate with the limit bolts are opened on both sides of the elliptical plate.

[0007] An air purification mechanism is fixedly connected to the outer wall of the elliptical plate, and an air pretreatment mechanism is fixedly connected to the bottom end of the air purification mechanism.

[0008] An air intake drying mechanism is fixedly connected to the inner wall of the top of the cylindrical upper shell.

[0009] The top of the cylindrical upper shell is fixedly fitted with an L-shaped inlet pipe and an L-shaped outlet pipe.

[0010] In the aforementioned filter for air duct purification, the air purification mechanism includes a U-shaped plate fixedly connected to the lower surface of an elliptical plate. Both the elliptical plate and the U-shaped plate have two circular holes on their bottom outer walls, and the walls of these holes are respectively fixedly connected to a first purification threaded sealing cap and a second purification threaded sealing cap. The inner walls of the openings of the first and second purification threaded sealing caps are respectively threaded to a first purification cylinder and a second purification cylinder. Both the first and second purification cylinders are filled with an activated carbon adsorption particle layer. The top of the first purification threaded sealing cap is fixedly connected to a first inlet three-way reversing solenoid valve and a first outlet three-way reversing solenoid valve. The top of the second purification threaded sealing cap is fixedly connected to... The system is fixedly connected to a second intake three-way reversing solenoid valve and a second exhaust three-way reversing solenoid valve. The side intake ends of the first and second intake three-way reversing solenoid valves are fixedly connected to a first Y-shaped pipe. The top intake ends of the first and second intake three-way reversing solenoid valves are fixedly connected to a second Y-shaped pipe. The side exhaust ends of the first and second exhaust three-way reversing solenoid valves are fixedly connected to a third Y-shaped pipe. The exhaust end of the third Y-shaped pipe is fixedly connected to the intake end of an L-shaped outlet pipe via a pipe clamp. The bottom exhaust ends of both the first and second intake three-way reversing solenoid valves are fixedly connected to an air guide extension assembly.

[0011] In the above-mentioned filter for air duct purification, the air guiding extension assembly includes two extension tubes that are fixedly connected to the outlet ends of the first air inlet three-way reversing solenoid valve and the second air inlet three-way reversing solenoid valve, respectively. The bottom ends of the two extension tubes extend into the bottom cavities of the first purification cylinder and the second purification cylinder, respectively. The bottom ends of the extension tubes are provided with multiple air outlet holes.

[0012] In the aforementioned filter for air duct purification, the air pretreatment mechanism includes a heat-insulating cylinder fixedly connected to the bottom of a second purification cylinder. An inner cylinder is fixedly connected to the inner wall of the heat-insulating cylinder. Multiple semiconductor cooling chips are fixedly embedded in the outer wall of the inner cylinder. An inlet spiral tube and an outlet spiral tube are fixedly embedded in the top of the inner cylinder. The walls of the inlet and outlet spiral tubes are in contact with the cooling side of the semiconductor cooling chips. A partition is fixedly connected to the bottom of both the inlet and outlet spiral tubes. The partition divides the internal cavity of the inner cylinder into a cooling zone and a water storage zone. A fixing through hole is provided on the upper surface of the partition. A liquid level sensor is fixedly connected to the wall of the through hole. A protective sponge block is fixedly sleeved on the rod wall of the liquid level sensor. An air inlet pipe is fixedly connected to the air inlet end of the air inlet spiral pipe. The air outlet end of the air inlet pipe passes through the outer wall of the heat insulation cylinder and is fixedly connected to the air outlet end of the L-shaped inlet pipe through a pipe clamp. The air inlet end of the first Y-shaped pipe passes through the inner wall of the heat insulation cylinder and is fixedly connected to the air outlet end of the air outlet spiral pipe. Multiple threaded holes are opened on the outer wall of the bottom end of the heat insulation cylinder, and an air filter canister is threadedly sealed to the hole wall of the threaded holes. A round hole is opened on the outer wall of the heat insulation cylinder located in the water storage area, and a normally closed solenoid valve is fixedly connected to the hole wall of the round hole.

[0013] In the above-mentioned filter for purifying air ducts, the air inlet end of the air filter canister is fixedly connected to a rubber ring, the inner wall of the rubber ring is fixedly connected to a filter mesh, and the bottom outer wall of the cylindrical lower shell is provided with a plurality of snap-fit ​​holes that cooperate with the outer wall of the rubber ring.

[0014] In the aforementioned filter for purifying air ducts, the air intake drying mechanism includes a U-shaped frame fixedly connected to the inner wall of the top of a cylindrical upper shell. A micro air pump and a PLC controller are fixedly connected to the outer wall of the U-shaped frame. The air intake end of the micro air pump is fixedly connected to a branch pipe. The air intake end of the branch pipe passes through the wall of the heat insulation cylinder and communicates with the internal cavity of the heat insulation cylinder. The air intake end of the second Y-shaped pipe is fixedly connected to the air outlet end of the micro air pump.

[0015] In the above-mentioned filter for purifying air ducts, a discharge conduit is fixedly connected to the inner wall of the outlet end of the cylindrical lower shell, and a protective mesh sleeve is fixedly sleeved to the outlet end of the discharge conduit by a pipe clamp.

[0016] In the aforementioned filter for purifying air ducts, the outer ends of both the L-shaped inlet pipe and the L-shaped outlet pipe are fixedly connected to a second flange, and the outer walls of both second flanges are fixedly fitted with reinforcing tubes, the side ends of which are fixedly connected to the outer wall of the cylindrical upper shell.

[0017] Compared to existing technologies, the advantages of a filter for air duct purification are:

[0018] 1. Through the air pretreatment mechanism, when the filter purifies the compressed air, the cooling side of the semiconductor refrigeration chip is in contact with the walls of the inlet and outlet spiral tubes, continuously reducing the internal temperature of the flow channel. The compressed air to be treated first spirals downwards along the inlet spiral tube, fully exchanging heat with the low-temperature tube wall. The gaseous water vapor condenses into liquid water droplets upon encountering the cold air. The centrifugal force generated by the spiral flow channel throws the water droplets to the tube wall, where they converge and slide down to the water storage area. The airflow, having removed most of the free water, then spirals upwards into the outlet spiral tube for further cooling, completing the pretreatment. The air is then sent to an air purification unit for further processing. This structure solves the problems of existing adsorption filters when directly processing high-humidity compressed air. These problems include the activated carbon adsorption granules quickly reaching saturation due to the adsorption of a large amount of water vapor, resulting in rapid decay of purification effect, short effective working cycle, and easy clogging of adsorbent pores by impurities. This structure can significantly reduce the water vapor treatment load of the downstream adsorption unit, extend the effective duration of single adsorption purification, slow down the adsorption saturation rate, ensure long-term stable adsorption efficiency, effectively improve the defects of rapid failure of activated carbon adsorption filter media, and enhance the reliability of continuous purification of the filter.

[0019] 2. Through the established air purification and air intake drying mechanisms, when the filter is running continuously, the first and second purification cylinders alternately switch positions under the coordinated control of multiple sets of three-way reversing solenoid valves. One set of purification cylinders is connected to the main compressed air circuit. The airflow enters evenly from the bottom and passes through the activated carbon adsorption particle layer from bottom to top, deeply removing residual moisture and ensuring that the output air source meets the drying and cleanliness requirements of epoxy powder coating. The other set of purification cylinders is simultaneously connected to the external airflow pipeline provided by the air intake drying mechanism. A micro air pump draws external airflow carrying heat from the heat dissipation side of the semiconductor cooling chip and sends it into the corresponding purification cylinder, utilizing the heat dissipation... Heat and a continuous airflow accelerate the desorption of moisture adsorbed in the pores of activated carbon, achieving in-situ drying and regeneration of the adsorbent. This structure solves the problems of existing single-cylinder adsorption filters requiring shutdown and disassembly for filter media replacement after adsorption saturation, resulting in high maintenance labor intensity, easy interruption of spraying production, and inability to adapt to long-term continuous operation production lines. It can achieve simultaneous purification gas supply and adsorption regeneration, and the adsorption performance can be restored without shutdown and disassembly throughout the process, significantly extending the overall service life of activated carbon, significantly reducing the labor intensity of maintenance personnel, avoiding production stoppages caused by filter element replacement, and improving the ease of use of the filter and the continuity of production line operation.

[0020] 3. Through the configuration of the PLC controller, liquid level sensor, cylindrical upper shell, and cylindrical lower shell, during filter operation, the PLC controller can automatically switch the purification cylinder position, start and stop the regeneration gas path, and automatically control the drainage of the water storage area according to preset parameters. The liquid level sensor monitors the water level in the water storage area in real time, and automatically opens the normally closed solenoid valve to drain the accumulated water when the warning threshold is reached, without the need for manual operation or supervision. The core purification and pretreatment components are fixed to the inner wall of the cylindrical upper shell by elliptical plates and limit bolts. After disassembling the first flange to separate the upper and lower shells, the internal components can be removed for maintenance. This structure enables fully automated operation of the filter, reduces the frequency of manual intervention, and avoids the risk of purification failure due to water overflow or failure to promptly address filter saturation. At the same time, the modular integrated structure significantly reduces the difficulty of maintenance and repair, improves equipment operation and maintenance efficiency and operational stability, and can meet the long-term stable operation requirements of industrial spraying scenarios. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a filter for purifying air ducts provided by the present invention;

[0022] Figure 2 yes Figure 1 A cross-sectional structural diagram;

[0023] Figure 3 yes Figure 2 A partially enlarged structural diagram;

[0024] Figure 4 This is a three-dimensional structural diagram of the elliptical plate and the U-shaped plate.

[0025] Figure 5 This is a cross-sectional structural diagram of the first purification cylinder;

[0026] Figure 6 yes Figure 2 A cross-sectional structural schematic diagram of the air pretreatment mechanism;

[0027] Figure 7 This is a schematic diagram of the air-guiding extension component in a filter for air duct purification provided by the present invention;

[0028] Figure 8 This is a side view of the structure of the second Y-shaped tube in a filter for air duct purification provided by the present invention.

[0029] In the diagram: 1. Cylindrical upper shell; 2. Cylindrical lower shell; 3. First flange; 4. Elliptical plate; 5. Limiting bolt; 6. Air purification mechanism; 61. U-shaped plate; 62. First purification threaded sealing cap; 63. Second purification threaded sealing cap; 64. First purification cylinder; 65. Second purification cylinder; 66. Activated carbon adsorption particle layer; 67. First inlet three-way reversing solenoid valve; 68. First outlet three-way reversing solenoid valve; 69. Second inlet three-way reversing solenoid valve; 610. Second outlet three-way reversing solenoid valve; 611. First Y-shaped tube; 612. Second Y-shaped tube; 613. Third Y-shaped tube; 7. Air guide extension assembly; 71. Extension tube; 72. Outlet fine... 8. Hole; 8. Air pretreatment mechanism; 81. Insulation cylinder; 82. Inner cylinder; 83. Semiconductor cooling chip; 84. Inlet spiral pipe; 85. Outlet spiral pipe; 86. Partition plate; 87. Cooling zone; 88. Water storage zone; 89. Liquid level sensor; 810. Protective sponge block; 811. Inlet duct; 812. Air filter canister; 813. Normally closed solenoid valve; 9. Inlet drying mechanism; 91. U-shaped frame; 92. Miniature air pump; 93. PLC controller; 94. Branch pipe; 10. L-shaped inlet pipe; 11. L-shaped outlet pipe; 12. Rubber ring; 13. Filter cloth; 14. Discharge duct; 15. Protective mesh sleeve; 16. Second flange; 17. Reinforcing pipe. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] like Figures 1-8 As shown, a filter for purifying air ducts includes a cylindrical upper shell 1 and a cylindrical lower shell 2. A first flange 3 is fixedly connected to one side of the cylindrical upper shell 1 and the cylindrical lower shell 2. The two first flanges 3 are fixedly connected by bolts. An elliptical plate 4 is placed on the inner wall of the cylindrical upper shell 1. Two symmetrically distributed screw holes are opened on the outer wall of the cylindrical upper shell 1, and the hole walls of the screw holes are threaded with limit bolts 5. Threaded holes that cooperate with the limit bolts 5 are opened on both sides of the elliptical plate 4.

[0032] An air purification mechanism 6 is fixedly connected to the outer wall of the elliptical plate 4, and an air pretreatment mechanism 8 is fixedly connected to the bottom end of the air purification mechanism 6.

[0033] An air intake drying mechanism 9 is fixedly connected to the inner wall of the top of the cylindrical upper shell 1;

[0034] The top of the cylindrical upper shell 1 is fixedly fitted with an L-shaped inlet pipe 10 and an L-shaped outlet pipe 11.

[0035] The air purification mechanism 6 includes a U-shaped plate 61 fixedly connected to the lower surface of the elliptical plate 4. Both the elliptical plate 4 and the U-shaped plate 61 have two circular holes on their bottom outer walls. A first purification threaded sealing cap 62 and a second purification threaded sealing cap 63 are fixedly connected to the walls of these holes, respectively. A first purification cylinder 64 and a second purification cylinder 65 are threadedly connected to the inner walls of the openings of the first and second purification threaded sealing caps 62 and 63, respectively. Both the first and second purification cylinders 64 and 65 are filled with activated carbon adsorption particle layers 66. A first inlet three-way reversing solenoid valve 67 and a first outlet three-way reversing solenoid valve 68 are fixedly connected to the top of the first purification threaded sealing cap 62. A second inlet three-way reversing solenoid valve 68 is fixedly connected to the top of the second purification threaded sealing cap 63. The first intake three-way reversing solenoid valve 69 and the second intake three-way reversing solenoid valve 610 are fixedly connected to the side intake ends of the first intake three-way reversing solenoid valve 67 and the second intake three-way reversing solenoid valve 69 via a first Y-shaped pipe 611. The top intake ends of the first intake three-way reversing solenoid valve 67 and the second intake three-way reversing solenoid valve 69 are fixedly connected to the second Y-shaped pipe 612. The side exhaust ends of the first exhaust three-way reversing solenoid valve 68 and the second exhaust three-way reversing solenoid valve 610 are fixedly connected to the third Y-shaped pipe 613. The exhaust end of the third Y-shaped pipe 613 is fixedly connected to the intake end of the L-shaped outlet pipe 11 via a pipe clamp. The bottom exhaust ends of the first intake three-way reversing solenoid valve 67 and the second intake three-way reversing solenoid valve 69 are both fixedly connected to the air guide extension assembly 7.

[0036] The air guiding extension assembly 7 includes two extension tubes 71 that are fixedly connected to the air outlets of the first air inlet three-way reversing solenoid valve 67 and the second air inlet three-way reversing solenoid valve 69, respectively. The bottom ends of the two extension tubes 71 extend into the bottom cavities of the first purification cylinder 64 and the second purification cylinder 65, respectively. The bottom ends of the extension tubes 71 are provided with multiple air outlet holes 72.

[0037] The air pretreatment mechanism 8 includes a heat-insulating cylinder 81 fixedly connected to the bottom end of the second purification cylinder 65. An inner cylinder 82 is fixedly connected to the inner wall of the heat-insulating cylinder 81. A plurality of semiconductor cooling chips 83 are fixedly embedded in the outer wall of the inner cylinder 82. An air inlet spiral pipe 84 and an air outlet spiral pipe 85 are fixedly embedded in the top end of the inner cylinder 82. The pipe walls of the air inlet spiral pipe 84 and the air outlet spiral pipe 85 are in contact with the cooling side of the semiconductor cooling chips 83. A partition 86 is fixedly connected to the bottom end of the air inlet spiral pipe 84 and the air outlet spiral pipe 85. The partition 86 divides the internal cavity of the inner cylinder 82 into a cooling zone 87 and a water storage zone 88. A fixed through hole is opened on the upper surface of the partition 86, and a liquid level sensor 89 is fixedly connected to the wall of the fixed through hole. A protective sponge block 810 is fixedly sleeved on the rod wall of the liquid level sensor 89. The side wall of the protective sponge block 810 contacts the inner wall of the inner cylinder 82, covering the entire water storage area 88, preventing water below the protective sponge block 810 from being carried into the air outlet spiral pipe 85. The air inlet end of the air inlet spiral pipe 84 is fixedly connected to the air inlet conduit 811. The air outlet end of the air inlet conduit 811 passes through the outer wall of the heat insulation cylinder 81 and is fixedly connected to the air outlet end of the L-shaped inlet pipe 10 through a pipe clamp. The air inlet end of the first Y-shaped pipe 611 passes through the inner wall of the heat insulation cylinder 81 and is fixedly connected to the air outlet end of the air outlet spiral pipe 85. The bottom outer wall of the heat insulation cylinder 81 is provided with multiple threaded holes, and the hole wall of the threaded holes is threadedly sealed with an air filter canister 812. The outer wall of the heat insulation cylinder 81 located in the water storage area 88 is provided with a round hole, and the hole wall of the round hole is fixedly connected with a normally closed solenoid valve 813.

[0038] The air inlet of the air filter canister 812 is fixedly connected to a rubber ring 12, and a filter mesh 13 is fixedly connected to the inner wall of the rubber ring 12. The bottom outer wall of the cylindrical lower shell 2 is provided with multiple snap-fit ​​holes that cooperate with the outer wall of the rubber ring 12.

[0039] The air intake drying mechanism 9 includes a U-shaped frame 91 fixedly connected to the inner wall of the top of the cylindrical upper shell 1. A micro air pump 92 and a PLC controller 93 are fixedly connected to the outer wall of the U-shaped frame 91. The air intake end of the micro air pump 92 is fixedly connected to a branch pipe 94. The air intake end of the branch pipe 94 passes through the wall of the heat insulation cylinder 81 and communicates with the internal cavity of the heat insulation cylinder 81. The air intake end of the second Y-shaped pipe 612 is fixedly connected to the air outlet end of the micro air pump 92.

[0040] The inner wall of the outlet end of the cylindrical lower shell 2 is fixedly connected to a discharge conduit 14, and the outlet end of the discharge conduit 14 is fixedly fitted with a protective mesh sleeve 15 by a pipe clamp.

[0041] The outer ends of the L-shaped inlet pipe 10 and the L-shaped outlet pipe 11 are both fixedly connected to a second flange 16. The outer walls of the two second flanges 16 are both fixedly fitted with reinforcing pipes 17, and the side ends of the reinforcing pipes 17 are fixedly connected to the outer wall of the cylindrical upper shell 1.

[0042] The operating principle of this invention is described as follows: Before the filter is connected to the compressed air pipeline, the operating parameters are preset in the PLC controller 93, including the alternation cycle of the first purification cylinder 64 and the second purification cylinder 65 (e.g., 1 hour), the warning liquid level threshold of the liquid level sensor 89, and the single drainage time of the normally closed solenoid valve 813 (e.g., 15 seconds). Then, the filter is connected in series to the epoxy powder-coated compressed air supply pipeline through two second flanges 16, so that the compressed air enters the filter through the L-shaped inlet pipe 10. After purification, the air returns to the supply pipeline through the L-shaped outlet pipe 11, completing the equipment assembly. The reinforcing pipe 17 can reinforce the connection between the L-shaped inlet pipe 10 and the L-shaped outlet pipe 11.

[0043] The first step is to pre-treat the compressed air by cooling, such as... Figure 2 and Figure 6 As shown, the PLC controller 93 controls the semiconductor cooling chip 83 to start working. The cooling side of the semiconductor cooling chip 83 continuously reduces the temperature inside the inlet spiral tube 84, the outlet spiral tube 85, and the inner cylinder 82. The compressed air to be purified enters the inlet duct 811 through the L-shaped inlet pipe 10, and then flows into the inlet spiral tube 84, flowing downwards along the spiral path. The low-temperature tube wall continuously cools the compressed air inside the tube, causing the gaseous water vapor in the air to condense into liquid water droplets upon contact with the cold air. At the same time, the centrifugal force generated by the spiral flow channel throws the condensed water droplets into the inlet spiral tube 84. Water droplets slide down the inner wall of the pipe to the bottom outlet. After dripping through the protective sponge block 810, they flow into the water storage area 88 for storage. The protective sponge block 810 can block airflow disturbance and prevent the water in the water storage area 88 from being rolled up and carried away by the airflow again. The compressed air, which has been dehydrated, enters the outlet spiral pipe 85 from the bottom of the inlet spiral pipe 84 and flows upward along the spiral path. It exchanges heat with the low-temperature pipe wall for a second time to further cool down. The pre-treated low-temperature and low-humidity air flows out from the top of the outlet spiral pipe 85 and is sent into the air purification mechanism 6 along the first Y-shaped pipe 611.

[0044] This pretreatment structure can significantly remove free water from compressed air, reduce the processing load of the downstream adsorption and drying, effectively extend the effective working time of the activated carbon adsorption particle layer 66, and alleviate the problem of rapid saturation of the activated carbon adsorption particle layer 66.

[0045] The second step involves alternating adsorption purification and online regeneration using the first purification cylinder 64 and the second purification cylinder 65, as follows: Figures 1-5 , Figure 7 and Figure 8As shown, in the initial state, the PLC controller 93 controls the side air inlet and bottom air outlet of the first air inlet three-way reversing solenoid valve 67 to be connected and the top air inlet to be closed; the bottom air inlet and side air outlet of the first air outlet three-way reversing solenoid valve 68 to be connected and the top air outlet to be closed; at the same time, the side air inlet of the second air inlet three-way reversing solenoid valve 69 is closed and the top air inlet is connected; the side air outlet of the second air outlet three-way reversing solenoid valve 610 is closed and the top air outlet is connected.

[0046] Pre-treated compressed air enters the first intake three-way reversing solenoid valve 67 through the first Y-shaped pipe 611, and is then evenly delivered to the bottom of the first purification cylinder 64 through the outlet fine hole 72 at the bottom of the extension pipe 71. The compressed air passes through the activated carbon adsorption particle layer 66 from bottom to top, and the residual water vapor is fully adsorbed and removed by the activated carbon. The dry and clean air that has completed deep purification flows out from the top of the first purification cylinder 64, flows into the third Y-shaped pipe 613 through the side outlet of the first outlet three-way reversing solenoid valve 68, and is finally delivered to the compressed air pipeline through the L-shaped outlet pipe 11, providing a clean and dry power source for epoxy powder spraying and avoiding quality defects such as powder agglomeration caused by water and oil in the air source.

[0047] While the first purification cylinder 64 performs adsorption purification, the second purification cylinder 65 simultaneously performs activated carbon drying and regeneration. The PLC controller 93 controls the micro air pump 92 to start. The micro air pump 92 continuously draws air from the cavity between the heat insulation cylinder 81 and the inner cylinder 82 through the branch pipe 94, creating a negative pressure state in the cavity. Under the action of pressure difference, outside air enters from the snap-fit ​​hole at the bottom of the cylindrical lower shell 2, and enters the negative pressure cavity after passing through the filter cloth 13 and the air filter canister 812 in sequence. When the clean outside air flows through the heat dissipation side of the semiconductor cooling chip 83, it carries away heat and performs forced heat dissipation on the semiconductor cooling chip 83, ensuring the continuous cooling effect on the cooling side. The air carrying heat is pressurized by the micro air pump 92 and sent into the second Y-shaped pipe 612, and then enters the second purification cylinder through the top air inlet of the second air inlet three-way reversing solenoid valve 69. 65, and injected into the bottom of the second purification cylinder 65 through the extension pipe 71. The external airflow carrying heat passes through the activated carbon adsorption particle layer 66 from bottom to top. The external airflow carrying heat can quickly remove the moisture adsorbed in the pores of the activated carbon. In this process, even without the heat dissipation side of the semiconductor cooling chip 83, the rapidly flowing external airflow can still regenerate and dry the activated carbon adsorption particle layer 66, ensuring that the activated carbon adsorption particle layer 66 can be used effectively. Finally, the external airflow carrying water vapor is discharged from the top outlet of the second outlet three-way reversing solenoid valve 610, flows into the outer shell cavity composed of the cylindrical upper shell 1 and the cylindrical lower shell 2, and is finally discharged to the outside of the equipment through the discharge pipe 14 and the protective net sleeve 15. The protective net sleeve 15 can prevent external dust and foreign objects from entering the equipment in reverse, ensuring the cleanliness of the internal structure.

[0048] This structure reuses the heat dissipation airflow of semiconductor cooling to improve the efficiency of activated carbon drying and regeneration, thereby improving energy utilization efficiency. At the same time, it enables online in-situ regeneration of the activated carbon adsorption particle layer 66, restoring adsorption performance without disassembling the machine.

[0049] The third step involves automatic switching between purification and regeneration stations, such as step 1- Figure 5 and Figure 7 As shown, when the first purification cylinder 64 reaches the preset working time (e.g., 1 hour), the PLC controller 93 controls each three-way reversing solenoid valve to switch its conduction state synchronously: the second inlet three-way reversing solenoid valve 69 switches to the side inlet end open and the top inlet end closed, the second outlet three-way reversing solenoid valve 610 switches to the side outlet end open and the top outlet end closed, and the pre-treated compressed air switches into the second purification cylinder 65 to perform deep adsorption purification, continuously and stably supplying air to the outside; at the same time, the first inlet three-way reversing solenoid valve 67 switches to the top inlet end open and the side inlet end closed, the first outlet three-way reversing solenoid valve 68 switches to the top outlet end open and the side outlet end closed, and the hot air flow delivered by the micro air pump 92 switches into the first purification cylinder 64 to dry and regenerate the activated carbon adsorption particle layer 66 that has been adsorbed to saturation. The first purification cylinder 64 and the second purification cylinder 65 alternately perform the adsorption purification and drying and regeneration processes, always maintaining a working state of one-way purification air supply and one-way offline repair.

[0050] The alternating structure of the first purification cylinder 64 and the second purification cylinder 65 enables short-cycle self-repair of the adsorption filter element, significantly extending the overall service life of the activated carbon. Staff only need to replace the activated carbon adsorption particle layer 66 at long cycles (such as 6 months), eliminating the need for frequent disassembly of the equipment to replace the filter element. This effectively reduces the labor intensity of operation and maintenance, avoids interruption of spraying operations due to filter element replacement, and improves the continuous working reliability and ease of use of the filter.

[0051] The fourth step is the automatic drainage of water storage area 88, such as... Figure 6 As shown, the liquid level sensor 89 monitors the water level in the water storage area 88 in real time. When the liquid level rises to the preset warning threshold, the liquid level sensor 89 sends a signal to the PLC controller 93. The PLC controller 93 then controls the normally closed solenoid valve 813 to be energized and opened. The water in the water storage area 88 flows out rapidly under the action of compressed air pressure, first entering the bottom cavity of the cylindrical lower shell 2, and then being discharged from the equipment through the discharge pipe 14 and the protective net sleeve 15. After the preset drainage time (such as 15 seconds) is reached, the PLC controller 93 controls the normally closed solenoid valve 813 to be de-energized and closed, completing one automatic drainage cycle.

[0052] The automatic drainage function can prevent excessive water accumulation in the water storage area from flowing back into the compressed air pipeline, ensuring the reliability of the filter in removing moisture from the compressed air. It eliminates the need for manual periodic disassembly and drainage, thus improving the stability of unmanned operation of the device.

[0053] The elliptical plate 4 inside the equipment is fixed to the inner wall of the cylindrical upper shell 1 by the limiting bolt 5, which can support and fix the air purification mechanism 6 and the air pretreatment mechanism 8 as a whole. When it is necessary to inspect and maintain the internal components, the cylindrical upper shell 1 and the cylindrical lower shell 2 can be separated by removing the connecting bolt of the first flange 3, and the internal core components can be taken out as a whole by unscrewing the limiting bolt 5, which improves the convenience of inspection and maintenance.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A filter for purifying air ducts, comprising a cylindrical upper shell (1) and a cylindrical lower shell (2), wherein a first flange (3) is fixedly connected to one side of each of the cylindrical upper shell (1) and the cylindrical lower shell (2), and the two first flanges (3) are fixedly connected by bolts, characterized in that, The inner wall of the cylindrical upper shell (1) is provided with an elliptical plate (4). The outer wall of the cylindrical upper shell (1) has two symmetrically distributed screw holes, and the screw hole wall is threaded with a limit bolt (5). Both sides of the elliptical plate (4) are provided with threaded holes that cooperate with the limit bolt (5). An air purification mechanism (6) is fixedly connected to the outer wall of the elliptical plate (4), and an air pretreatment mechanism (8) is fixedly connected to the bottom end of the air purification mechanism (6). An air intake drying mechanism (9) is fixedly connected to the inner wall of the top of the cylindrical upper shell (1). The top of the cylindrical upper shell (1) is fixedly fitted with an L-shaped inlet pipe (10) and an L-shaped outlet pipe (11).

2. A filter for purifying air ducts according to claim 1, characterized in that, The air purification mechanism (6) includes a U-shaped plate (61) fixedly connected to the lower surface of the elliptical plate (4). The bottom outer walls of both the elliptical plate (4) and the U-shaped plate (61) have two round holes, and the walls of the two round holes are respectively fixedly connected to a first purification threaded sealing cap (62) and a second purification threaded sealing cap (63). The inner walls of the openings of the first purification threaded sealing cap (62) and the second purification threaded sealing cap (63) are respectively threadedly connected to a first purification cylinder (64) and a second purification cylinder (65). The first purification cylinder (64) and the second purification cylinder (65) are both filled with an activated carbon adsorption particle layer (66). The top of the first purification threaded sealing cap (62) is fixedly connected to a first air inlet three-way reversing solenoid valve (67) and a first air outlet three-way reversing solenoid valve (68). The top of the second purification threaded sealing cap (63) is fixedly connected to a second air inlet three-way valve. The first intake three-way reversing solenoid valve (69) and the second intake three-way reversing solenoid valve (610) are fixedly connected to the side intake ends of the first intake three-way reversing solenoid valve (67) and the second intake three-way reversing solenoid valve (69) via a first Y-shaped pipe (611). The top intake ends of the first intake three-way reversing solenoid valve (67) and the second intake three-way reversing solenoid valve (69) are fixedly connected to the second Y-shaped pipe (612). The side exhaust ends of the first exhaust three-way reversing solenoid valve (68) and the second exhaust three-way reversing solenoid valve (610) are fixedly connected to the third Y-shaped pipe (613). The exhaust end of the third Y-shaped pipe (613) is fixedly connected to the intake end of the L-shaped outlet pipe (11) via a pipe clamp. The bottom exhaust ends of the first intake three-way reversing solenoid valve (67) and the second intake three-way reversing solenoid valve (69) are both fixedly connected to the air guide extension assembly (7).

3. A filter for purifying air ducts according to claim 2, characterized in that, The air guiding extension assembly (7) includes two extension tubes (71) that are fixedly connected to the air outlets of the first air inlet three-way reversing solenoid valve (67) and the second air inlet three-way reversing solenoid valve (69), respectively. The bottom ends of the two extension tubes (71) extend into the bottom cavities of the first purification cylinder (64) and the second purification cylinder (65), respectively. The bottom ends of the extension tubes (71) are provided with a plurality of air outlet holes (72).

4. A filter for purifying air ducts according to claim 2, characterized in that, The air pretreatment mechanism (8) includes a heat insulation cylinder (81) fixedly connected to the bottom end of the second purification cylinder (65). An inner cylinder (82) is fixedly connected to the inner wall of the heat insulation cylinder (81). A plurality of semiconductor cooling chips (83) are fixedly embedded in the outer wall of the inner cylinder (82). An air inlet spiral pipe (84) and an air outlet spiral pipe (85) are fixedly embedded in the top end of the inner cylinder (82). The pipe walls of the air inlet spiral pipe (84) and the air outlet spiral pipe (85) are in contact with the cooling side of the semiconductor cooling chip (83). A partition plate (86) is fixedly connected to the bottom end of the air inlet spiral pipe (84) and the air outlet spiral pipe (85). The partition plate (86) divides the internal cavity of the inner cylinder (82) into a cooling zone (87) and a water storage zone (88). A fixing through hole is opened on the upper surface of the partition plate (86). A liquid level sensor (89) is fixedly connected to the wall. A protective sponge block (810) is fixedly sleeved on the rod wall of the liquid level sensor (89). The air inlet end of the air inlet spiral pipe (84) is fixedly connected to the air inlet conduit (811). The air outlet end of the air inlet conduit (811) passes through the outer wall of the heat insulation cylinder (81) and is fixedly connected to the air outlet end of the L-shaped inlet pipe (10) through the pipe clamp. The air inlet end of the first Y-shaped pipe (611) passes through the inner wall of the heat insulation cylinder (81) and is fixedly connected to the air outlet end of the air outlet spiral pipe (85). The bottom outer wall of the heat insulation cylinder (81) is provided with multiple threaded holes, and the hole wall of the threaded holes is thread-sealed with an air filter canister (812). The outer wall of the heat insulation cylinder (81) located in the water storage area (88) is provided with a round hole, and the hole wall of the round hole is fixedly connected with a normally closed solenoid valve (813).

5. A filter for purifying air ducts according to claim 4, characterized in that, The air inlet of the air filter canister (812) is fixedly connected to a rubber ring (12), and a filter mesh (13) is fixedly connected to the inner wall of the rubber ring (12). The bottom outer wall of the cylindrical lower shell (2) is provided with multiple snap-fit ​​holes that cooperate with the outer wall of the rubber ring (12).

6. A filter for purifying air ducts according to claim 5, characterized in that, The air intake drying mechanism (9) includes a U-shaped frame (91) fixedly connected to the inner wall of the top of the cylindrical upper shell (1). A micro air pump (92) and a PLC controller (93) are fixedly connected to the outer wall of the U-shaped frame (91). The air intake end of the micro air pump (92) is fixedly connected to a branch pipe (94). The air intake end of the branch pipe (94) passes through the wall of the heat insulation cylinder (81) and communicates with the internal cavity of the heat insulation cylinder (81). The air intake end of the second Y-shaped pipe (612) is fixedly connected to the air outlet end of the micro air pump (92).

7. A filter for purifying air ducts according to claim 1, characterized in that, The inner wall of the outlet end of the cylindrical lower shell (2) is fixedly connected to a discharge conduit (14), and the outlet end of the discharge conduit (14) is fixedly fitted with a protective mesh sleeve (15) by a pipe clamp.

8. A filter for purifying air ducts according to claim 1, characterized in that, The outer ends of the L-shaped inlet pipe (10) and the L-shaped outlet pipe (11) are fixedly connected to a second flange (16), and the outer walls of the two second flanges (16) are fixedly fitted with reinforcing pipes (17). The side ends of the reinforcing pipes (17) are fixedly connected to the outer wall of the cylindrical upper shell (1).

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