Indoor nitrogen oxide air purifier

Abstract

This invention discloses an indoor nitrogen oxide air purifier, comprising a purifier body and a fan body and an original filter body respectively disposed at the upper and lower ends of the purifier body. A transfer and collection ring plate is detachably disposed inside the purifier body, and a filter cover is fitted on the air outlet side of the transfer and collection ring plate. A horizontal plate is disposed on the lower part of the inner side of the filter cover, and several arc-shaped grooves are arranged opposite each other on the top wall of the filter cover and the upper surface of the horizontal plate. A filter material permeable ring is disposed on the inner top wall of the filter cover. An air-blocking rod is disposed between the filter cover and the arc-shaped grooves opposite each other on the horizontal plate, and an interval lifting and resetting component is disposed between the filter cover and the air-blocking rod. The horizontal reciprocating movement of the adjusting plate causes the upper and lower positions of the air-blocking rod to be cyclically adjusted, so that the air intake and exhaust directions on both sides of the filter material permeable ring are cyclically switched, avoiding long-term single-sided air intake of the filter material permeable ring, and the two sides are evenly and alternately adsorbed, improving the adsorption effect of the activated carbon layer built into the filter material permeable ring during long-term use.

Description

Technical Field

[0001] This invention belongs to the field of air purification technology, specifically relating to an indoor nitrogen oxide air purifier. Background Technology

[0002] Air purifiers, also known as air decomposers, are devices that can adsorb, decompose, or transform various air pollutants, including PM2.5, dust, pollen, odors, formaldehyde, nitrogen oxides, bacteria, and allergens. In home kitchens, the combustion of gas or natural gas produces high flame temperatures, generating nitrogen oxides. Nitrogen oxides (NOx) are a collective term for compounds of nitrogen and oxygen, such as NO, N2O, N2O3, N2O4, and N2O5. Indoor nitrogen oxides enter the human body through respiration, irritating the respiratory tract and lungs, causing corrosive damage to the heart, liver, and kidneys, and can also cause acute or chronic poisoning and have carcinogenic effects, seriously affecting human health. Therefore, air purifiers are needed to purify nitrogen oxides in the air. Existing air purifiers use catalytic reduction, absorption, and adsorption to absorb nitrogen oxides from the air. Catalytic reduction and adsorption are commonly used methods, specifically achieved through catalysts and activated carbon filters, respectively.

[0003] For example, Chinese patent CN214287562U discloses an air purifier, which includes an outer cylinder and an inner cylinder. The upper and lower ends of the outer cylinder and the inner cylinder are connected by a connecting mesh, and a filling cavity is formed between the outer cylinder and the inner cylinder. A mesh ceramic core is provided in the lower part of the filling cavity, and an activated carbon layer is provided in the upper part of the filling cavity. A catalyst layer is coated on the surface of the mesh ceramic core. A heating plate is provided on the lower inner wall of the outer cylinder, and an air guide shroud is provided at the lower end of the outer cylinder.

[0004] However, the above solution has the following shortcomings: Since air containing nitrogen oxides can only enter from the outside of the outer cylinder to the inside, air can only enter from the outer side of the activated carbon layer. The activated carbon layer filling the cavity is fixed, and some nitrogen oxides will enter and be stored in the micropores of the activated carbon. However, the pores of activated carbon are irregularly distributed on the outer surface. Nitrogen oxides in the air entering from one side mainly accumulate on the air intake side of the activated carbon, while the air adsorbed on the back side of the activated carbon layer is less. If the air intake side of the activated carbon layer becomes saturated, its back side still has adsorption capacity. However, existing air purifiers cannot make the air drawn in from the air intake side evenly distributed on both sides of the activated carbon layer, causing the adsorption efficiency of the activated carbon layer on one side to decrease rapidly with the extension of the usage time. How to make the air drawn in from the air intake side of the air purifier distributed on both sides of the activated carbon layer, thereby improving the adsorption effect of the activated carbon layer, is a problem that needs to be solved at present. Summary of the Invention

[0005] The purpose of this invention is to provide an indoor nitrogen oxide air purifier to solve the problems existing in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An indoor nitrogen oxide air purifier includes a purifier body and a fan body and an original filter body respectively disposed at the upper and lower ends of the purifier body. A transfer and collection ring plate is detachably disposed inside the purifier body between the air outlet side of the fan body and the original filter body. A filter cover is fitted on the air outlet side of the transfer and collection ring plate and is used to filter nitrogen oxides.

[0008] A horizontal plate is provided on the lower inner side of the filter cover, and several arc-shaped grooves are arranged opposite each other on the top wall of the filter cover and the upper surface of the horizontal plate. A filter material air-permeable ring extending to the upper surface of the horizontal plate is provided on the inner top wall of the filter cover between adjacent arc-shaped grooves. An air-blocking rod is provided between the arc-shaped grooves opposite each other on the filter cover and the horizontal plate to block a single arc-shaped groove. An interval lifting and resetting assembly is provided between the filter cover and the air-blocking rod. The interval lifting and resetting assembly causes the arc-shaped grooves at the inlet and outlet ends of the filter material air-permeable rings to be staggered open by the several air-blocking rods.

[0009] Preferably, the center of the filter cover and the center of the arc-shaped groove on the horizontal plate are both located on the central axis of the transfer and gas collection ring plate, and the diameter of several arc-shaped grooves increases sequentially outward from the central axis. The filter material's permeable ring is filled with activated carbon particles and used to adsorb nitrogen oxides flowing through the air.

[0010] Preferably, the air-blocking rod frame includes an upper sealing arc ring block and a lower sealing arc ring block symmetrically arranged at its upper and lower ends. The up-and-down movement of the air-blocking rod frame can respectively shield and seal the arc ring grooves on the filter cover and the horizontal plate.

[0011] Preferably, the interval lifting and resetting assembly includes a push-down spring sleeve rod disposed on both sides of the bottom end of the lower sealing arc ring block, the push-down spring sleeve rod passing through the arc ring groove on the horizontal plate, a support hole plate disposed inside the filter cover below the horizontal plate, the support hole plate being provided with preset holes for the push-down spring sleeve rod to slide through, and a driven arc block disposed at the bottom end of the push-down spring sleeve rod.

[0012] Preferably, the lower ends of both inner side walls of the filter cover are provided with sealing sliding holes. The interval lifting and resetting assembly includes an adjusting plate that slides through the sealing sliding holes. The upper surface of the adjusting plate is provided with a top arc block and a groove. When the driven arc block and the top arc block on one side of the filter material air-permeable ring come into contact, the corresponding arc ring groove on the inner top wall of the filter cover is sealed by the upper sealing arc ring block. The arc ring groove on the horizontal plate and the lower sealing arc ring block are separated and opened.

[0013] At this time, the other side of the filter material air-permeable ring is inserted into the groove corresponding to the driven arc block. The upper sealing arc ring block and the upper sealing arc ring block on the inner top wall of the filter cover are separated and opened. The arc ring groove and the lower sealing arc ring block on the horizontal plate are in contact and sealed.

[0014] Preferably, a mounting bracket is provided on the outer side of the filter cover, and an electromagnet block is provided on the mounting bracket. A return spring sleeve is movably provided on the side wall of the adjustment plate and the mounting bracket. A magnetized metal block is provided at the outer end of the return spring sleeve and magnetically connected to the electromagnet block. The electromagnet block is in a normally open state. When the electromagnet block is working and magnetically connected to the magnetized metal block, the driven arc block moves from the contact part of the top arc block to the groove of the next position. At the same time, the driven arc block in the groove moves to the top arc block of the next position, so that the superior arc ring slots of the inlet and outlet ends of the filter material air permeable ring on both sides are in an alternating open state.

[0015] Preferably, a photocatalytic plate is fitted onto the upper surface of the filter cover, which is used to catalytically decompose carbon monoxide, nitrogen oxides, hydrocarbons, aldehydes and benzene in the gas discharged from the filter cover.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the horizontal reciprocating motion of the adjusting plate causes the vertical position of the air-blocking rod to be adjusted cyclically, thereby causing the air intake and exhaust directions on both sides of the filter material air-permeable ring to be cyclically reversed, and the direction of air flowing through the filter material air-permeable ring to be cyclically reversed left and right. The air drawn in from the air intake side of the purifier body can be cyclically distributed on both sides of the filter material air-permeable ring, effectively filtering nitrogen and oxygen compounds such as NO, N2O, N2O3, N2O4, and N2O5. This avoids long-term single-sided air intake of the filter material air-permeable ring, extends the service life of the activated carbon layer inside the filter material air-permeable ring, and the uniform alternating adsorption on both sides improves the adsorption effect of the activated carbon layer built into the filter material air-permeable ring during long-term use. Attached Figure Description

[0017] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0019] Figure 3for Figure 2 A magnified schematic diagram of a portion of the adjustment plate area;

[0020] Figure 4 for Figure 2 A schematic diagram of the adjusting plate in the magnetic attraction state between the electromagnet block and the magnetized metal block;

[0021] Figure 5 This is a schematic diagram of the separated structure of the filter cover and the photocatalytic plate of the present invention;

[0022] Figure 6 for Figure 5 A cross-sectional view of the filter cover;

[0023] Figure 7 This is a schematic diagram of the half-section structure of the filter material air-permeable ring of the present invention;

[0024] Figure 8 for Figure 2 Schematic diagram of vertical separation structure of air-blocking rods of different diameters in the image;

[0025] Figure 9 for Figure 2 A top view of the overall filter media air-permeable ring.

[0026] In the diagram: 1. Purifier body; 2. Fan body; 3. Original filter body; 4. Transfer and collection ring plate; 5. Filter cover; 6. Horizontal plate; 7. U-shaped arc ring groove; 8. Filter media breathable ring; 9. Air blocking rod bracket; 10. Upper sealing U-shaped arc ring block; 11. Lower sealing U-shaped arc ring block; 12. Downward push spring sleeve rod; 13. Support hole plate; 14. Driven arc block; 15. Sealing sliding hole; 16. Adjusting plate; 17. Top arc block; 18. Groove; 19. Mounting bracket; 20. Electromagnet block; 21. Reset spring sleeve rod; 22. Magnetized metal block; 23. Photocatalytic plate body. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] Please see Figure 1-9 The present invention provides a technical solution:

[0029] Example 1:

[0030] An indoor nitrogen oxide air purifier includes a purifier body 1 and a fan body 2 and an original filter body 3 respectively disposed at the upper and lower ends of the purifier body 1. The purifier body 1 is connected to an external power supply, and the original filter body 3 is a cylindrical purifier filter element with a service life of 6-12 months. A transfer and collection ring plate 4 is detachably disposed inside the purifier body 1 between the fan body 2 and the air outlet side of the original filter body 3. The transfer and collection ring plate 4 is composed of a circular plate with a collection hole with a diameter of 10cm in the middle. The transfer and collection ring plate 4 is fixed to the inner wall of the outer shell of the purifier body 1 by a snap-fit ​​method (not shown) for easy disassembly. The transfer and collection ring plate 4 is made of ABS plastic. A filter cover 5 is fitted on the air outlet side of the transfer and collection ring plate 4 for filtering nitrogen oxides contained in the intake air. The nitrogen oxides are composed of nitrogen and oxygen compounds such as NO, N2O, N2O3, N2O4, and N2O5.

[0031] A horizontal plate 6 is detachably fixed to the lower inner side of the filter cover 5 by screws or clips. Four arc-shaped grooves 7 are arranged opposite each other on the top wall of the filter cover 5 and the upper surface of the horizontal plate 6. A filter media permeable ring 8 extending to the upper surface of the horizontal plate 6 is provided on the inner top wall of the filter cover 5 between adjacent arc-shaped grooves 7. The filter media permeable ring 8 can adsorb nitrogen oxides in the airflow. An air-blocking rod 9 is provided between the arc-shaped grooves 7 on the filter cover 5 and the horizontal plate 6 to seal each individual arc-shaped groove 7, ensuring that only one of the opposite arc-shaped grooves 7 is open. A spacer-lifting reset assembly is provided between the filter cover 5 and the air-blocking rod 9. Figure 2 or Figure 2 As shown in the diagram, the interval lifting and reset assembly causes the four air-blocking rods 9 to open the arc-shaped grooves 7 of the inlet and outlet ends, which are located diagonally opposite on both sides of the filter material air-permeable ring 8, in an alternating open state. This ensures that the air passing through the arc-shaped grooves 7 on the horizontal plate 6 passes through the adjacent filter material air-permeable rings 8 for nitrogen oxide filtration.

[0032] Example 2:

[0033] Based on Example 1, it is further explained that the centers of the circular arc grooves 7 on the filter cover 5 and the horizontal plate 6 are both located on the central axis of the transfer and collection ring plate 4, and the diameters of the four circular arc grooves 7 increase sequentially outward from the central axis. Figure 8 As shown, the diameter of the air-blocking rod frame 9, which cooperates with the arc-shaped groove 7, is adaptively adjusted. The two sides of the filter material air-permeable ring 8 are composed of 30-mesh isolation mesh plates, which are breathable. The filter material air-permeable ring 8 is filled with activated carbon particles with a diameter greater than 30 mesh, which are used to adsorb nitrogen oxides flowing through the air. At the same time, 5% silica dehumidifying particles are mixed into the activated carbon particles to absorb moisture, effectively alleviating the caking of activated carbon particles in humid environments and extending their service life.

[0034] Example 3:

[0035] Based on Embodiment 1, the air-blocking rod frame 9 includes an upper sealing arc ring block 10 and a lower sealing arc ring block 11 symmetrically arranged at its upper and lower ends. The cross-sections of the upper sealing arc ring block 10 and the lower sealing arc ring block 11 are both semi-circular structures, and the upper sealing arc ring block 10 and the lower sealing arc ring block 11 are arc-shaped structures when viewed from above. The cross-sections of the upper sealing arc ring block 10 and the lower sealing arc ring block 11 can form a complete circle. The up and down movement of the air-blocking rod frame 9 can respectively cover and seal the arc ring groove 7 on the filter cover 5 and the horizontal plate 6, thereby facilitating the control of the air intake and exhaust directions on both sides of the filter material air-permeable ring 8.

[0036] The interval lifting and resetting assembly includes a push spring sleeve 12 disposed on both sides of the bottom end of the lower sealing arc ring block 11. The push spring sleeve 12 can generate a downward spring force on the lower sealing arc ring block 11. The push spring sleeve 12 passes through the arc ring groove 7 on the horizontal plate 6. The filter cover 5 is provided with a support hole plate 13 located below the horizontal plate 6. The support hole plate 13 is provided with a preset hole for the push spring sleeve 12 to slide through. The bottom end of the spring on the push spring sleeve 12 is fixed on the support hole plate 13 to play an elastic support role. The bottom end of the push spring sleeve 12 is snapped or screwed to a driven arc block 14. The driven arc block 14 has an arc-shaped cross section.

[0037] The lower ends of both inner side walls of the filter cover 5 are provided with horizontally oriented sealing sliding holes 15. The interval lifting and resetting assembly includes an adjusting plate 16 that slides through the sealing sliding hole 15. The adjusting plate 16 can slide horizontally within the sealing sliding hole 15, and sealing grease is applied between the adjusting plate 16 and the sealing sliding hole 15. A sealing ring is also bonded to the inner wall of the sealing sliding hole 15. The frictional resistance of the sealing ring on the adjusting plate 16 does not affect the horizontal sliding of the adjusting plate 16 under external force. The upper surface of the adjusting plate 16 is provided with a top arc block 17 and a groove 18. The height difference between the top arc block 17 and the driven arc block 14 ensures that the lower sealing arc ring block 11 separates from the corresponding arc ring groove 7 end on the horizontal plate 6. Figure 2 As shown, when the driven arc block 14 and the top arc block 17 on the left side of the filter material air-permeable ring 8 come into contact, the corresponding arc ring groove 7 on the inner top wall of the filter cover 5 is sealed by the upper sealing arc ring block 10. The arc ring groove 7 on the horizontal plate 6 and the lower sealing arc ring block 11 are separated and opened, so that the gas that has been initially purified by the original filter body 3 can enter through the opened arc ring groove 7 on the horizontal plate 6.

[0038] At this time, the right side of the filter material permeable ring 8 is inserted into the groove 18 corresponding to the driven arc block 14. The upper sealing arc ring block 10 on the inner top wall of the filter cover 5 is separated and opened. The upper arc ring slot 7 on the horizontal plate 6 and the lower sealing arc ring block 11 are in contact and sealed. At this time, the air flowing through the arc ring slot 7 on the horizontal plate 6 can only pass through the filter material permeable ring 8 and be discharged from the arc ring slot 7 on the top wall of the filter cover 5 in the opposite direction. In the above process, the filter material permeable ring 8 adsorbs and filters nitrogen oxides, carbon monoxide, formaldehyde and similar harmful household gases in the air.

[0039] A mounting bracket 19 is snapped or screwed onto the outer side of the filter cover 5. An electromagnet block 20 is mounted on the mounting bracket 19. The electromagnet block 20 is a KK-P25 / 29D DC24V type manufactured by Zhejiang Qianggu Special Plastics Co., Ltd. The control terminal of the electromagnet block 20 is electrically connected to the controller of the purifier body 1. When the electromagnet block 20 is working, it runs for 10 minutes after a delay by connecting an external delay switch or the built-in drive circuit of the purifier body 1, and then closes for 10 minutes, causing the electromagnet block 20 to cycle through opening and closing every 10 minutes. A reset spring sleeve 21 is movably mounted on the side wall of the adjustment plate 16 and the mounting bracket 19. The mounting bracket 19 has an F-shaped structure and pre-drilled mounting holes. The reset spring sleeve 21 slides through the mounting holes and can generate a rightward spring return force on the adjustment plate 16. Figure 2 As shown, the leftmost top arc block 17 of the adjusting plate 16 inside the filter cover 5 is adapted to the corresponding driven arc block 14. The outer end of the reset spring sleeve 21 is provided with a magnetized metal block 22 that is magnetically connected to the electromagnet block 20. The magnetized metal block 22 is made of iron. The electromagnet block 20 is in a normally open state. Figures 2 to 4 The state diagram shows that when the electromagnet block 20 is working and magnetically connected to the magnetized metal block 22, the driven arc block 14 moves from the contact part of the top arc block 17 to the groove 18 at the next position. At the same time, the driven arc block 14 located in the groove 18 moves to the top arc block 17 at the next position, so that the arc ring slots 7 of the inlet and outlet ends of the filter material air ring 8 are staggered open. At this time, the air inlet direction on both sides of the filter material air ring 8 is reversed, realizing the air entry method on both sides of the filter material air ring 8.

[0040] A photocatalytic plate 23 is fitted onto the upper surface of the filter cover 5. Under light irradiation, the valence band electrons of the nano-photocatalyst are excited to the conduction band, forming electrons and holes. These electrons and holes react with O2 and H2O adsorbed on its surface to generate superoxide anion free radicals, O2− and hydroxyl free radicals -OH. These free radicals have strong oxidative decomposition capabilities, capable of breaking C-C bonds, CH bonds, CN bonds, CO bonds, OH bonds, and NH bonds in organic matter, decomposing organic matter into carbon dioxide and water. Simultaneously, they disrupt bacterial cell membranes, solidify viral proteins, and alter the survival environment of bacteria and viruses, thereby killing them. Specifically, nano-TiO2 is coated on the substrate. The TiO2 carrier absorbs ultraviolet light radiation and is excited... The active material generates electrons and holes, thus exhibiting a strong photo-oxidation-reduction reaction. It decomposes carbon monoxide, nitrogen oxides, hydrocarbons, aldehydes, benzene, and various harmful gases in the air, catalytically reducing them into environmentally friendly and pollution-free H2O and CO2. The photocatalytic plate 23 is used to catalytically decompose carbon monoxide, nitrogen oxides, hydrocarbons, aldehydes, and benzene in the gas discharged from the filter hood 5. The photocatalytic plate 23 covers the gas outlet side of the filter hood 5, and symmetrically arranged on the lower inner side of the photocatalytic plate 23 are compatible ultraviolet lamps connected to an external power supply. The ultraviolet lamps generate ultraviolet light to further purify the nitrogen oxides in the air discharged from the filter hood 5 using the photocatalytic plate 23.

[0041] The working principle is as follows: The filter cover 5 is fixedly installed on the upper surface of the transfer and collection ring plate 4, and the electromagnet block 20 on the filter cover 5 and the ultraviolet lamp built into the photocatalytic plate 23 are connected to the power supply of the purifier body 1. At the same time, the electromagnet block 20 and the ultraviolet lamp built into the photocatalytic plate 23 can be controlled by the built-in controller of the purifier body 1. The transfer and collection ring plate 4 is installed between the fan body 2 and the original filter 3 by snap-fit, and the air outlet side of the original filter 3 and the air inlet side of the transfer and collection ring plate 4 are in contact. The built-in controller of the purifier body 1 drives the electromagnet block 20 to open or close every ten minutes. When the electromagnet block 20 is in the open state, refer to... Figure 2 As shown, the air passing through the intermediate gas collecting ring plate 4 passes through the open arc ring slot 7 on the horizontal plate 6. Since the upper sealing arc ring block 10 and the lower sealing arc ring block 11 at both ends of the air blocking rod frame 9 can only open one arc ring slot 7 at the upper and lower ends, the air discharged through the horizontal plate 6 will pass through the filter material permeable ring 8 on one side and be discharged from the arc ring slot 7 on the top wall of the obliquely opposite filter cover 5. The filter material permeable ring 8 can adsorb and purify nitrogen and oxygen compounds such as NO, N2O, N2O3, N2O4 and N2O5 in the passing air.

[0042] When electromagnet block 20 is in the closed state, refer to... Figure 4The change shown is that the horizontal leftward movement of the adjustment plate 16 adjusts the vertical position of the air blocking rod 9, thereby changing the direction of the air flowing through the filter material permeable ring 8. This allows the air drawn in from the air intake side of the purifier body 1 to be circulated and distributed on both sides of the filter material permeable ring 8, avoiding long-term single-sided air intake of the filter material permeable ring 8, extending the service life of the activated carbon layer inside the filter material permeable ring 8, and ensuring uniform alternating adsorption on both sides, thus improving the adsorption effect of the activated carbon layer inside the filter material permeable ring 8 during long-term use.

[0043] Furthermore, the air purified by the filter cover 5 will be purified a second time by the photocatalytic plate 23, which will decompose and catalyze the nitrogen oxides and harmful gases that escape from the filter material breathable ring 8.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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. An indoor nitrogen oxide air purifier, comprising a purifier body (1) and a fan body (2) and an original filter body (3) respectively disposed at the upper and lower ends therein, characterized in that: The air purifier body (1) is equipped with a transfer air collection ring plate (4) which is detachably installed between the fan body (2) and the original filter body (3) on the air outlet side. The transfer air collection ring plate (4) is fitted with a filter cover (5) on the air outlet side and is used to filter indoor nitrogen oxides. A horizontal plate (6) is provided on the lower inner side of the filter cover (5), and a number of arc ring slots (7) are arranged opposite to each other on the top wall of the filter cover (5) and the upper end face of the horizontal plate (6). A filter material air-permeable ring (8) extending to the upper end face of the horizontal plate (6) is provided on the inner top wall of the filter cover (5) between adjacent arc ring slots (7). An air-blocking rod frame (9) is provided between the arc ring slots (7) arranged opposite to each other on the filter cover (5) and the horizontal plate (6) for sealing a single arc ring slot (7). An interval lifting and resetting assembly is provided between the filter cover (5) and the air-blocking rod frame (9). The air-blocking rod frame (9) includes an upper sealing arc ring block (10) and a lower sealing arc ring block (11) symmetrically arranged at its upper and lower ends. The up and down movement of the air-blocking rod frame (9) can respectively cover and seal the arc ring groove (7) on the filter cover (5) and the horizontal plate (6). The interval lifting and resetting assembly includes a push spring sleeve (12) on both sides of the bottom end of the lower sealing arc ring block (11), the push spring sleeve (12) passes through the arc ring groove (7) on the horizontal plate (6), the filter cover (5) is provided with a support hole plate (13) located below the horizontal plate (6), the support hole plate (13) is provided with a preset hole for the push spring sleeve (12) to slide through, and the bottom end of the push spring sleeve (12) is provided with a driven arc block (14). The filter cover (5) has sealing sliding holes (15) at the lower ends of both inner side walls. The interval lifting and resetting assembly includes an adjusting plate (16) that slides through the sealing sliding hole (15). The upper end face of the adjusting plate (16) is provided with a top arc block (17) and a groove (18). When the driven arc block (14) on one side of the filter material air-permeable ring (8) and the top arc block (17) come into contact, the corresponding arc ring groove (7) on the inner top wall of the filter cover (5) is sealed by the upper sealing arc ring block (10). The upper arc ring groove (7) and the lower sealing arc ring block (11) of the horizontal plate (6) are separated and opened. At this time, the filter material breathable ring (8) on the other side is inserted into the groove (18) corresponding to the driven arc block (14). The upper sealing arc ring block (10) on the inner top wall of the filter cover (5) is separated and opened. The upper arc ring groove (7) and the lower sealing arc ring block (11) of the horizontal plate (6) are in contact and sealed. The filter cover (5) is provided with a mounting bracket (19) on the outer side, and an electromagnet block (20) is provided on the mounting bracket (19). The side wall of the adjustment plate (16) and the mounting bracket (19) are provided with a movably arranged reset spring sleeve rod (21). The outer end of the reset spring sleeve rod (21) is provided with a magnetized metal block (22) that is magnetically connected to the electromagnet block (20). The electromagnet block (20) is opened or closed every ten minutes.

2. The indoor nitrogen oxide air purifier according to claim 1, characterized in that: The center of the circular arc groove (7) on the filter cover (5) and the horizontal plate (6) is located on the central axis of the transfer gas collecting ring plate (4), and the diameter of several circular arc grooves (7) increases outward from the central axis. The filter material permeable ring (8) is filled with activated carbon particles and used to adsorb nitrogen oxides flowing through the air.

3. An indoor nitrogen oxide air purifier according to claim 1, characterized in that: When the electromagnet block (20) is working and magnetically connected to the magnetized metal block (22), the driven arc block (14) moves from the contact part of the top arc block (17) to the groove (18) of the next position. At the same time, the driven arc block (14) located in the groove (18) moves to the top arc block (17) of the next position, so that the superior arc ring slots (7) of the inlet and outlet ends of the filter material permeable ring (8) are staggered open.

4. An indoor nitrogen oxide air purifier according to claim 1, characterized in that: The filter cover (5) is fitted with a photocatalytic plate (23) on its upper surface. The photocatalytic plate (23) is used to catalytically decompose carbon monoxide, nitrogen oxides, hydrocarbons and aldehydes in the gas discharged from the filter cover (5).

Images