A self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst

Abstract

The invention discloses a self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst, relates to the technical field of fume hoods, comprises a main ventilation cabinet, the top of which is fixedly connected with a purification cabinet, a control panel is fixedly connected to the middle position of the front of the main ventilation cabinet, an air intake pipe is fixedly connected to the bottom position of one side of the main ventilation cabinet, an exhaust box is fixedly connected to the top center position of the purification cabinet, a purification mechanism is arranged inside the main ventilation cabinet, the purification mechanism comprises a plasma generator and a titanium dioxide purifier, the plasma generator and the titanium dioxide purifier suck VOC gas through the air intake pipe based on reciprocating motion, and at the same time, the titanium dioxide purifier rotates to generate centrifugal force; water generated by redox reaction will be separated from titanium dioxide under the action of centrifugal force, so that titanium dioxide can continuously promote the plasma formed by VOC gas to perform redox reaction, thereby improving the effect of purifying VOC gas by the purification mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of fume hoods, and in particular to a self-cleaning fume hood based on the synergistic effect of low-temperature plasma and a catalyst. Background Art

[0002] Existing laboratory fume hoods, such as a laboratory fume hood disclosed in patent publication number CN110180855A, can absorb VOC harmful gases generated in the laboratory in a timely manner, but the emissions are not treated in any way, resulting in the VOC harmful gases still floating in the laboratory environment and polluting the air in the laboratory environment. When VOC harmful gases are treated by ordinary catalysts, the effect is poor, and high-concentration VOC harmful gases cannot be completely purified and discharged. Therefore, a fume hood is needed that can absorb and purify high-concentration VOC harmful gases in a timely manner so that they can be discharged directly without polluting the air in the laboratory environment. Summary of the invention

[0003] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst, so as to solve the problem in the prior art that when the fume hood absorbs and discharges VOC harmful gases discharged from the laboratory, it cannot completely purify the emission of high-concentration VOC harmful gases, resulting in VOC harmful gases polluting the air around the laboratory.

[0004] The purpose of the present invention can be achieved through the following technical solutions:

[0005] The present invention provides a self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst, comprising a main ventilation cabinet, a purification cabinet is fixedly connected to the top of the main ventilation cabinet, a control panel is fixedly connected to the middle position of the front of the main ventilation cabinet, an air intake pipe is fixedly connected to the bottom position of one side of the main ventilation cabinet, an exhaust box is fixedly connected to the top center position of the purification cabinet, a purification mechanism is arranged inside the main ventilation cabinet, the purification mechanism comprises a plurality of plasma generators and titanium dioxide purifiers, and the plasma generator and the titanium dioxide purifier suck VOC gas through the air intake pipe based on reciprocating motion, and at the same time, the titanium dioxide purifier generates centrifugal force.

[0006] As a further solution of the present invention: the ventilation main cabinet includes a main cabinet body, and a fixed piston is fixedly connected to the interior of the main cabinet near the plasma generator. A gas transmission channel is opened inside the fixed piston, and the gas transmission channel is connected to the air intake pipe. The fixed piston matches the inner cavity of the plasma generator.

[0007] As a further solution of the present invention: a one-way valve is installed in the gas delivery channel inside the fixed piston.

[0008] As a further solution of the present invention: a fixing rod is installed at a position of the main cabinet near several groups of titanium dioxide purifiers, a transmission gear is installed at the center of the fixing rod through a bearing, a gear groove matching the transmission gear is opened at a position near the transmission gear on the side of the titanium dioxide purifier, and a hydraulic cylinder is installed at a bottom of the main cabinet near the bottom of the plasma generator, and the top of the hydraulic cylinder is fixedly connected to the top of the side of the plasma generator through a hydraulic rod.

[0009] As a further solution of the present invention: a delivery pipeline is fixedly connected to the bottom end of the titanium dioxide purifier, the delivery pipeline matches the inner cavity of the plasma generator, and a one-way valve is installed inside the delivery pipeline.

[0010] As a further solution of the present invention: a centrifugal cavity is provided inside the titanium dioxide purifier, a rotating inner cylinder is arranged at the center of the centrifugal cavity, the interior of the rotating inner cylinder is filled with nano-titanium dioxide, and an exhaust port is provided at the top of the centrifugal cavity.

[0011] As a further solution of the present invention: an infusion hose is fixedly connected to the bottom of the centrifugal chamber, and one end of the infusion hose away from the centrifugal chamber is connected to the external environment of the ventilation main cabinet.

[0012] As a further solution of the present invention: a ball nut is installed at the inner center of the rotating inner cylinder, a mounting block is fixedly connected to the top surface of the inner cavity of the purification cabinet, a lead screw is fixedly connected to the bottom surface of the mounting block, and the lead screw matches the ball nut.

[0013] As a further solution of the present invention: the ball nut includes a rotating inner ring, a rotating outer ring is nested on the outer side of the rotating inner ring, the side surface of the rotating inner ring is rotatably connected with elastic teeth, and the inner wall of the rotating outer ring is provided with inverted tooth grooves matching the elastic teeth.

[0014] As a further solution of the present invention: a VOC sensor is installed inside the air intake duct, and the VOC sensor collects the concentration value of the VOC gas inside the air intake duct in real time and transmits the concentration value to the control panel. The control panel presets a concentration threshold of the VOC gas. If the concentration value is less than the concentration threshold, the plasma generator is not started. If the concentration value is greater than or equal to the concentration threshold, the plasma generator is started.

[0015] Beneficial effects of the present invention:

[0016] 1. In the present invention, through the purification mechanism, the plasma generator and the titanium dioxide purifier suck the VOC gas through the air intake pipe based on reciprocating motion, and at the same time, the titanium dioxide purifier generates centrifugal force. Therefore, after the VOC gas forms plasma and enters the titanium dioxide purifier, it will be affected by the centrifugal force generated by the titanium dioxide purifier. Under the action of centrifugal force, it will fully contact with titanium dioxide, promoting the redox reaction. Under the action of centrifugal force, the water generated by the redox reaction will separate from the titanium dioxide, which is convenient for titanium dioxide to continuously promote the plasma formed by the VOC gas to perform the redox reaction, thereby improving the effect of the purification mechanism in purifying the VOC gas.

[0017] 2. In the present invention, the top end of the delivery pipe is directly connected to the rotating inner cylinder, so that the plasma in the inner cavity of the plasma generator directly enters the rotating inner cylinder through the delivery pipe and contacts with the nano-titanium dioxide in the rotating inner cylinder. The nano-titanium dioxide in the rotating inner cylinder is granular, so there will be gaps between the nano-titanium dioxide, which is helpful for the plasma to fully contact with the nano-titanium dioxide. After the plasma formed by the VOC gas contacts the nano-titanium dioxide, a large number of negative ions are ionized by the plasma itself. Under the catalytic action of the nano-titanium dioxide, an oxidation-reduction reaction will occur quickly to generate carbon dioxide and water, thereby achieving the effect of purifying the VOC gas, so that the VOC gas treated by the ventilation main cabinet can be directly discharged into the laboratory without polluting the air in the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings:

[0019] Figure 1 It is a structural schematic diagram of a self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst according to the present invention;

[0020] Figure 2 This is a front view of the self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the purification mechanism in the present invention;

[0022] Figure 4 It is a schematic diagram of the internal structure of the self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst of the present invention;

[0023] Figure 5 It is a partial front view of the self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst of the present invention;

[0024] Figure 6 It is a structural schematic diagram of the ventilation main cabinet in the present invention;

[0025] Figure 7 It is a partial cross-sectional view of a self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst of the present invention;

[0026] Figure 8 It is a partial structural schematic diagram of the purification mechanism in the present invention;

[0027] Fig. 9 It is a partial structural front view of the purification mechanism in the present invention;

[0028] Fig.10 It is a structural schematic diagram of a single set of plasma generator and titanium dioxide purifier in the present invention;

[0029] Fig.11 is a cross-sectional view of a single set of plasma generator and titanium dioxide purifier in the present invention;

[0030] Fig.12 It is a schematic diagram of the internal structure of the ball nut in the present invention.

[0031] Figure numerals: 1. ventilation main cabinet; 11. main cabinet body; 12. sealing plate; 13. fixed piston; 14. fixed rod; 15. transmission gear; 16. hydraulic cylinder; 2. purification cabinet; 3. control panel; 4. air intake duct; 5. purification mechanism; 51. plasma generator; 52. conveying pipeline; 53. titanium dioxide purifier; 54. mounting block; 55. screw; 56. rotating inner cylinder; 57. ball nut; 571. rotating inner ring; 572. rotating outer ring; 573. elastic teeth; 58. centrifugal chamber; 59. exhaust port; 6. exhaust box. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1 - Fig.12As shown, the present invention discloses a self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst, comprising a main ventilation cabinet 1, a purification cabinet 2 is fixedly connected to the top of the main ventilation cabinet 1, a sealing plate 12 is installed between the main ventilation cabinet 1 and the purification cabinet 2, and the sealing plate 12 can isolate the internal space between the main ventilation cabinet 1 and the purification cabinet 2, a control panel 3 is fixedly connected to the middle position of the front of the main ventilation cabinet 1, a PCB circuit board is arranged inside the control panel 3, and a liquid crystal touch screen is arranged on the top of the control panel 3, and technical personnel in this field can control the operation of the main ventilation cabinet 1 and the purification cabinet 2 through the control panel 3, an air intake duct 4 is fixedly connected to the bottom position of one side of the main ventilation cabinet 1, and the end of the air intake duct 4 away from the main ventilation cabinet 1 can be connected to the laboratory VOC gas exhaust pipe or the exhaust port of other experimental instruments, so that the main ventilation cabinet 1 can absorb VOC gas in time through the air intake duct 4 to prevent VOC gas from leaking into the air inside the laboratory and polluting the air of the laboratory, an exhaust box 6 is fixedly connected to the top center position of the purification cabinet 2, and a purification mechanism 5 is arranged inside the main ventilation cabinet 1, and after the main ventilation cabinet 1 absorbs VOC gas through the air intake duct 4, it can The VOC gas is transported to the purification mechanism 5, which can purify the VOC gas. The purification mechanism 5 includes several groups of plasma generators 51 and titanium dioxide purifiers 53. The plasma generator 51 and the titanium dioxide purifier 53 suck the VOC gas through the air intake pipe 4 based on reciprocating motion, and at the same time, the titanium dioxide purifier 53 generates centrifugal force. The specifications and types of the plasma generator 51 are adaptively selected by technicians in this field according to the purpose of the laboratory and the type of VOC gas produced by the laboratory. When the VOC gas enters the purification mechanism 5, it first enters the plasma generator 51. The plasma generator 51 performs low-temperature ionization on the incoming VOC gas to form plasma, and then the formed plasma is transported to the titanium dioxide purifier 53. The outer material of the titanium dioxide purifier 53 is made of transparent material. An ultraviolet lamp is installed on the side of the purification cabinet 2 to ensure that the ultraviolet light emitted by the ultraviolet lamp can irradiate the inside of the titanium dioxide purifier 53, so that the titanium dioxide purifier 53 produces a catalytic effect, so that the VOC gas forms plasma to undergo an oxidation-reduction reaction to produce carbon dioxide and water.

[0035] Since the plasma generator 51 and the titanium dioxide purifier 53 draw VOC gas through the air intake pipe 4 based on reciprocating motion, the titanium dioxide purifier 53 generates centrifugal force at the same time. Therefore, after the VOC gas forms plasma and enters the titanium dioxide purifier 53, it will be affected by the centrifugal force generated by the titanium dioxide purifier 53. After the VOC gas forms plasma and enters the titanium dioxide purifier 53, it will fully contact with titanium dioxide under the action of centrifugal force, thereby promoting the redox reaction. The water generated by the redox reaction will separate from the titanium dioxide under the action of centrifugal force, so that the titanium dioxide can continuously promote the redox reaction of the plasma formed by the VOC gas, thereby improving the effect of the purification mechanism 5 in purifying the VOC gas.

[0036] The carbon dioxide produced by the plasma formed by the VOC gas is transported to the purification cabinet 2 by the purification mechanism 5, and the purification cabinet 2 then transports the carbon dioxide to the exhaust box 6. A fan can be installed inside the exhaust box 6. The fan exhausts the internal gas to form a negative pressure in the inner cavity of the purification cabinet 2, which helps the plasma formed by the VOC gas in the titanium dioxide purifier 53 to pass through the titanium dioxide.

[0037] Example 2

[0038] like Figure 5 and Figure 6 As shown, the ventilation main cabinet 1 includes a main cabinet 11, and a fixed piston 13 is fixedly connected to the position of the main cabinet 11 near the plasma generator 51. A gas transmission channel is opened inside the fixed piston 13, and the gas transmission channel is connected to the air intake pipe 4. The fixed piston 13 matches the inner cavity of the plasma generator 51, and a one-way valve is installed in the gas transmission channel inside the fixed piston 13. When the plasma generator 51 moves upward on the outer side of the fixed piston 13, the fixed piston 13 will increase the volume of the sealed cavity inside the plasma generator 51 (the sealed cavity is formed by the plasma generator 51 and the fixed piston 13), so the plasma generator 51 can absorb VOC gas through the gas transmission channel inside the fixed piston 13. The one-way valve installed in the gas transmission channel inside the fixed piston 13 can ensure that the VOC gas in the gas transmission channel enters the plasma generator 51, and prevent the VOC gas in the plasma generator 51 from entering the gas transmission channel.

[0039] like Figure 5 and Figure 6As shown, a fixing rod 14 is installed at a position of the main cabinet 11 near several groups of titanium dioxide purifiers 53, and a transmission gear 15 is installed at the center of the fixing rod 14 through a bearing. A gear groove matching the transmission gear 15 is provided at a position near the transmission gear 15 on the side of the titanium dioxide purifier 53. When the titanium dioxide purifier 53 on one side of the transmission gear 15 moves upward, the titanium dioxide purifier 53 on the other side of the transmission gear 15 must move downward under the cooperation of the transmission gear 15 and the gear groove, and the displacement distance of the titanium dioxide purifiers 53 on both sides of the transmission gear 15 is the same. A hydraulic cylinder 16 is installed at the bottom of the main cabinet 11 near the bottom of the plasma generator 51. The top of the hydraulic cylinder 16 is fixedly connected to the top of the side of the plasma generator 51 through a hydraulic rod. When in use, the hydraulic cylinder 16 is opened, and the hydraulic rod at the top of the hydraulic cylinder 16 will push the plasma generator 51 fixedly connected thereto, so as to Figure 5 and Figure 6 For example, a total of 18 titanium dioxide purifiers 53 are arranged inside the ventilation main cabinet 1, and the 18 titanium dioxide purifiers 53 are divided into 6 groups, with three titanium dioxide purifiers 53 in each group. The 6 groups of titanium dioxide purifiers 53 can be marked as group 1-6 titanium dioxide purifiers 53 from left to right, and the hydraulic cylinder 16 is used to drive group 1 titanium dioxide purifiers 53 and group 5 titanium dioxide purifiers 53, so that when the hydraulic cylinder 16 is opened, group 1 titanium dioxide purifiers 53 and group 5 titanium dioxide purifiers 53 will move upward, while groups 2, 4 and 6 titanium dioxide purifiers 53 will move downward synchronously, and group 3 titanium dioxide purifiers 53 will move upward, that is, when the hydraulic cylinder 16 pushes the hydraulic rod, titanium dioxide purifiers 53 No. 1, No. 3 and No. 5 move upward, and titanium dioxide purifiers 53 No. 2, No. 4 and No. 6 move downward synchronously.

[0040] When the titanium dioxide purifiers 53 of groups 1, 3 and 5 move upward, in cooperation with the fixed piston 13 inside the main cabinet 11, the plasma generators 51 corresponding to the titanium dioxide purifiers 53 of groups 1, 3 and 5 inhale the VOC gas from the air intake pipe 4 through the fixed piston 13. When the fixed piston 13 is at the bottom position of the plasma generator 51, the rising of the plasma generator 51 is stopped, and the power of the plasma generator 51 is turned on, so that a voltage difference is generated inside the plasma generator 51, and the VOC gas inside the plasma generator 51 is ionized to form plasma.

[0041] Start the hydraulic cylinder 16 again. At this time, the hydraulic cylinder 16 moves the titanium dioxide purifiers 53 of groups 1, 3 and 5 downward through the hydraulic rod. When the titanium dioxide purifiers 53 of groups 1, 3 and 5 move downward, the plasma generator 51 cooperates with the fixed piston 13. The fixed piston 13 squeezes the plasma in the inner cavity of the plasma generator 51, so that the plasma enters the corresponding titanium dioxide purifier 53.

[0042] like Figure 5 , Figure 6 and Figure 8 As shown, the bottom end of the titanium dioxide purifier 53 is fixedly connected with a delivery pipe 52, and the delivery pipe 52 matches the inner cavity of the plasma generator 51. A one-way valve is installed inside the delivery pipe 52. It should be noted that the one-way valve can ensure that the gas in the plasma generator 51 enters the titanium dioxide purifier 53 through the delivery pipe 52, and prevent the gas in the titanium dioxide purifier 53 from entering the plasma generator 51 through the delivery pipe 52. When the fixed piston 13 squeezes the plasma in the inner cavity of the plasma generator 51, the plasma in the inner cavity of the plasma generator 51 will enter the titanium dioxide purifier 53 through the delivery pipe 52.

[0043] like Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, a centrifugal chamber 58 is provided inside the titanium dioxide purifier 53, a rotating inner cylinder 56 is provided at the center of the centrifugal chamber 58, the interior of the rotating inner cylinder 56 is filled with nano-titanium dioxide, and an exhaust port 59 is provided at the top of the centrifugal chamber 58. It should be noted that the outer shell of the titanium dioxide purifier 53 and the rotating inner cylinder 56 are both made of transparent materials, and the top of the delivery pipe 52 is directly connected to the rotating inner cylinder 56, so that the plasma in the inner cavity of the plasma generator 51 can directly enter the rotating inner cylinder 56 through the delivery pipe 52 and contact with the nano-titanium dioxide in the rotating inner cylinder 56. It should be noted that the nano-titanium dioxide in the rotating inner cylinder 56 can be granular, so that there will be gaps in the nano-titanium dioxide, which is conducive to the plasma to fully contact with the nano-titanium dioxide. After the plasma formed by the VOC gas contacts the nano-titanium dioxide, since the plasma itself is ionized into a large number of negative ions, under the catalytic action of the nano-titanium dioxide, a redox reaction will quickly occur to generate carbon dioxide and water, thereby achieving the effect of purifying the VOC gas, so that the VOC gas treated by the ventilation main cabinet 1 can be directly discharged into the laboratory without polluting the laboratory air.

[0044] like Figure 1 , Fig.10 and Fig.11As shown, a ball nut 57 is installed at the inner center position of the rotating inner cylinder 56, a mounting block 54 is fixedly connected to the top surface of the inner cavity of the purification cabinet 2, and a lead screw 55 is fixedly connected to the bottom surface of the mounting block 54. The lead screw 55 matches the ball nut 57. It should be noted that the positions of the lead screw 55 and the ball nut 57 correspond one to one. Bearings are installed at the top and bottom of the titanium dioxide purifier 53, and the bearings are used to limit the position of the rotating inner cylinder 56 so that the rotating inner cylinder 56 can stably rotate inside the titanium dioxide purifier 53.

[0045] like Fig.11 and Fig.12 As shown, the ball nut 57 includes a rotating inner ring 571, a rotating outer ring 572 is nested on the outer side of the rotating inner ring 571, and the side surface of the rotating inner ring 571 is rotatably connected with an elastic tooth 573. The inner wall of the rotating outer ring 572 is provided with an inverted tooth groove matching the elastic tooth 573. It should be noted that the outer side surface of the rotating outer ring 572 is fixedly connected to the inner wall of the rotating inner cylinder 56 through a long rod, and the inner wall of the rotating inner ring 571 is provided with a threaded groove matching the screw 55. When the titanium dioxide purifier 53 moves on the side of the screw 55, Fig.12 For example, when the lead screw 55 drives the rotating inner ring 571 to rotate clockwise, the elastic tooth 573 will be stably stuck on the inverted tooth groove under the action of the spring, so that the rotating rotating inner ring 571 will drive the rotating outer ring 572 to rotate synchronously. Since the outer side surface of the rotating outer ring 572 is fixedly connected to the inner wall of the rotating inner cylinder 56 through the long rod, the rotating rotating outer ring 572 will drive the rotating inner cylinder 56 to rotate synchronously. When the rotating inner cylinder 56 rotates, the plasma entering the rotating inner cylinder 56 will be in more sufficient contact with the nano-titanium dioxide under the action of centrifugal force. When the plasma undergoes an oxidation-reduction reaction to generate carbon dioxide and water, the water will flow to the inner wall of the rotating inner cylinder 56 under the action of centrifugal force, and finally flow to the bottom surface of the inner cavity of the titanium dioxide purifier 53 under the action of gravity, which can prevent water from adhering to the surface of the nano-titanium dioxide and affecting the catalytic effect of the nano-titanium dioxide.

[0046] An infusion hose is fixedly connected to the bottom of the centrifugal chamber 58, and one end of the infusion hose away from the centrifugal chamber 58 is connected to the external environment of the ventilation main cabinet 1. It should be noted that in order to prevent water flowing to the bottom of the inner cavity of the titanium dioxide purifier 53 from entering the delivery pipe 52, a guide groove can be opened on the bottom of the inner cavity of the titanium dioxide purifier 53, and the infusion hose is connected to the guide groove, so that the water in the guide groove can flow to the external environment of the ventilation main cabinet 1 through the infusion hose.

[0047] Example 3

[0048] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a VOC sensor (not shown in the attached figure) is installed inside the air intake duct 4. The VOC sensor collects the concentration value of the VOC gas inside the air intake duct 4 in real time and transmits the concentration value to the control panel 3. The control panel 3 presets a concentration threshold of the VOC gas. If the concentration value is less than the concentration threshold, the plasma generator 51 is not started. If the concentration value is greater than or equal to the concentration threshold, the plasma generator 51 is started.

[0049] It should be noted that when the concentration value of the VOC gas inside the air intake duct 4 collected by the VOC sensor is less than the concentration threshold, it means that the concentration value of the VOC gas is low, and the purification can be completed by a titanium dioxide purifier 53, and there is no need to start the plasma generator 51 for coordinated purification. Therefore, the plasma generator 51 can be disabled at this time to reduce the energy consumption of the ventilation main cabinet 1. When the concentration value of the VOC gas inside the air intake duct 4 collected by the VOC sensor is greater than or equal to the concentration threshold, it means that the concentration value of the VOC gas is high, and it cannot be completely purified by a titanium dioxide purifier 53. At this time, the control panel 3 can start the plasma generator 51 to ionize the VOC gas entering the plasma generator 51 to form plasma. In conjunction with the titanium dioxide purifier 53, the VOC gas with a higher concentration can be completely purified, which meets the direct emission standards of the laboratory and will not pollute the air of the laboratory.

[0050] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst, characterized in that: include: A ventilation main cabinet, the top of which is fixedly connected to a purification cabinet, a control panel is fixedly connected to the middle of the front of the ventilation main cabinet, an air intake duct is fixedly connected to the bottom of one side of the ventilation main cabinet, and an exhaust box is fixedly connected to the center of the top of the purification cabinet; A purification mechanism is arranged inside the ventilation main cabinet, and the purification mechanism includes a plasma generator and a titanium dioxide purifier, and the plasma generator and the titanium dioxide purifier suck VOC gas through the air intake pipe based on reciprocating motion, and at the same time, the titanium dioxide purifier generates centrifugal force; The ventilation main cabinet includes a main cabinet body, a fixed piston is fixedly connected to a position near the plasma generator inside the main cabinet body, a gas transmission channel is opened inside the fixed piston, the gas transmission channel is connected to the air intake pipeline, and the fixed piston matches the inner cavity of the plasma generator; A fixing rod is installed at a position of the main cabinet near the titanium dioxide purifier, a transmission gear is installed at the center of the fixing rod through a bearing, a gear groove matching the transmission gear is opened at a position near the transmission gear on the side of the titanium dioxide purifier, and a hydraulic cylinder is installed at the bottom of the main cabinet near the bottom of the plasma generator, and the top of the hydraulic cylinder is fixedly connected to the top of the side of the plasma generator through a hydraulic rod; A centrifugal chamber is provided inside the titanium dioxide purifier, a rotating inner cylinder is provided at the center of the centrifugal chamber, the interior of the rotating inner cylinder is filled with nano-titanium dioxide, and an exhaust port is provided at the top of the centrifugal chamber; A ball nut is installed at the inner center of the rotating inner cylinder, a mounting block is fixedly connected to the top surface of the inner cavity of the purification cabinet, a lead screw is fixedly connected to the bottom surface of the mounting block, and the lead screw matches the ball nut; A VOC sensor is installed inside the air intake duct. The VOC sensor collects the concentration value of the VOC gas inside the air intake duct in real time and transmits the concentration value to the control panel. The control panel presets the concentration threshold of the VOC gas. If the concentration value is less than the concentration threshold, the plasma generator will not be started. If the concentration value is greater than or equal to the concentration threshold, the plasma generator will be started.

2. A self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst according to claim 1, characterized in that: A one-way valve is installed in the gas delivery channel inside the fixed piston.

3. A self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst according to claim 1, characterized in that: The bottom end of the titanium dioxide purifier is fixedly connected with a delivery pipeline, the delivery pipeline matches the inner cavity of the plasma generator, and a one-way valve is installed inside the delivery pipeline.

4. A self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst according to claim 1, characterized in that: The bottom of the centrifugal chamber is fixedly connected with an infusion hose, and one end of the infusion hose away from the centrifugal chamber is communicated with the external environment of the ventilation main cabinet.

5. A self-cleaning fume hood based on the synergistic effect of low-temperature plasma and catalyst according to claim 1, characterized in that: The ball nut comprises a rotating inner ring, a rotating outer ring is nested on the outer side of the rotating inner ring, elastic teeth are rotatably connected to the side surface of the rotating inner ring, and an inverted tooth groove matching the elastic teeth is opened on the inner wall of the rotating outer ring.

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