A formaldehyde decomposition filter

Abstract

The utility model relates to the technical field of air purification, and specifically to a formaldehyde decomposition filter net. The technical problem to be solved is to overcome the defects of adsorption purification and catalytic purification in the prior art, which is mainly achieved through the following technical scheme: a formaldehyde decomposition filter net, comprising a filter frame, two adsorption layers and an excitation light source layer, the adsorption layer is arranged on two opposite sides of the excitation light source layer, the excitation light source layer includes a plurality of ultraviolet light sources and a mounting block, the adsorption layer includes an activated carbon layer and a catalytic layer, the activated carbon layer includes a plurality of activated carbon blocks, the activated carbon blocks include a plurality of honeycomb blocks with spiral filter holes, the filter holes can increase the contact area between the polluted gas and the inner wall of the honeycomb block, improve the adsorption effect, and the spiral structure can avoid internal ultraviolet light leakage, ensure the safety of use, after the adsorption layer adsorbs formaldehyde, the formaldehyde will be decomposed by the excitation light source layer, and the ozone generated by the ultraviolet light source will continue to be adsorbed and oxidized by the adsorption layer on the other side, avoiding additional pollution.

Description

Technical Field

[0001] The utility model relates to the technical field of air purification, in particular to a formaldehyde decomposition filter. Background Art

[0002] Formaldehyde, also known as formic aldehyde, is a colorless and irritating gas that can irritate the human eyes and nose. At present, formaldehyde has been clearly listed as a carcinogenic and teratogenic substance by the World Health Organization. When the indoor formaldehyde concentration reaches 0.5mg / m3, the human body will experience symptoms of tearing and abnormal eye sensitivity. Long-term exposure to low-dose formaldehyde environments may also cause chronic respiratory diseases and even increase the risk of malignant tumors such as nasopharyngeal cancer, colon cancer, and brain tumors.

[0003] Adsorption technology is one of the main methods of indoor air purification. Adsorption mostly uses porous materials such as activated carbon to adsorb gaseous pollutants such as formaldehyde. However, the adsorbed formaldehyde is only captured by materials such as activated carbon in a physical way, and the formaldehyde adsorption capacity of this method is small. There is also a risk of desorption after the activated carbon adsorption is saturated, so the filter needs to be replaced frequently and regularly. The catalytic principle is to use ultraviolet light to excite catalysts such as titanium dioxide to produce active oxygen and active hydroxyl groups, and then decompose formaldehyde into carbon dioxide and water through catalytic oxidation and other methods. This method has a long effective period and avoids the problem of frequent filter replacement, but ultraviolet light is harmful to the human body, and high-energy ultraviolet light will produce ozone, which is not good for the environment. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects of adsorption purification and catalytic purification in the prior art, thereby providing a formaldehyde decomposition filter.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A formaldehyde decomposition filter comprises a filter frame, two adsorption layers and an excitation light source layer, wherein the adsorption layer and the excitation light source layer are both embedded in the filter frame, the filter frame is rectangular and covers the adsorption layer and the excitation light source layer, the adsorption layer is arranged on two opposite sides of the excitation light source layer, the excitation light source layer comprises a plurality of ultraviolet light sources and a mounting block, a plurality of ultraviolet light sources are arranged in an array along the length direction of the filter frame and the height of the ultraviolet light source is less than the height of the filter frame, the mounting block is arranged at the bottom of the filter frame and the ultraviolet light sources are all snap-connected to the mounting block.

[0007] By adopting the above technical scheme, when the polluted gas passes through the front adsorption layer, the formaldehyde captured by the adsorption layer will be catalytically decomposed by the inner excitation light source layer, and the ozone generated by the ultraviolet light source will be adsorbed and oxidized by the rear adsorption layer. Through multiple adsorption and catalytic treatments, the method of activated carbon adsorption and ultraviolet catalysis is integrated, and the formaldehyde is completely decomposed into carbon dioxide and water by first adsorption and then catalytic decomposition, so as to achieve the purpose of thorough purification.

[0008] Furthermore, the adsorption layer on each side includes an activated carbon layer and a catalytic layer, the catalytic layer is arranged on a side close to the excitation light source layer and is sprayed on the activated carbon layer, and the catalytic layer is titanium dioxide.

[0009] By adopting the above technical solution, photocatalyst materials such as titanium dioxide are sprayed on the side of the activated carbon layer close to the excitation light source layer, so that after the activated carbon layer adsorbs formaldehyde, the formaldehyde captured by the activated carbon layer can be effectively decomposed into water and carbon dioxide in combination with the photocatalyst material and the ultraviolet light source, thereby extending the service life of the entire filter.

[0010] Furthermore, the activated carbon layer includes a plurality of bonded and fixed activated carbon blocks, each of which is surrounded by a reinforcement frame, which is rectangular and embedded on the outer side of the activated carbon block.

[0011] By adopting the above technical solution, multiple activated carbon blocks form an overall activated carbon layer, which makes it easy to adjust the filter size according to needs and adapt to different filters.

[0012] Furthermore, the activated carbon block includes a plurality of honeycomb blocks connected to each other at the sides, each of the honeycomb blocks is provided with a filter hole, the filter hole is spiral and has a pore size of 5mm-10mm, and the filter hole is axially arranged perpendicular to the outer side of the activated carbon block.

[0013] By adopting the above technical scheme, the spiral filter holes can increase the contact area between the polluted gas entering the honeycomb and the honeycomb block relative to the conventional straight hole structure, thereby improving the adsorption effect of a single honeycomb block and ensuring the low resistance of the overall filter net to avoid the influence of excessive wind resistance on the filtering effect; at the same time, since the filter holes are spiral, the leakage of internal ultraviolet light can be avoided to ensure the safety and utilization rate of ultraviolet light; during the production, the spiral filter holes are easy to process and can be removed in a spiral manner after the honeycomb block is pressed, and the process is simple.

[0014] Furthermore, the filter frame includes a U-shaped frame and a top frame that are snap-connected. The top frame is snap-connected on the top of the U-shaped frame opening. The U-shaped frame opening is upwardly arranged and guide grooves are provided on both sides of the opening. The guide grooves are located on the side of the adsorption layer away from the excitation light source layer.

[0015] By adopting the above technical solution, the U-shaped frame and the top frame that are snap-connected are easy to disassemble, and the guide groove also facilitates the installation of the adsorption layer.

[0016] Furthermore, limit bars are arranged on opposite sides of the U-shaped frame, the limit bars are arranged along the height direction of the U-shaped frame, the limit bars are arranged corresponding to the adsorption layer, and the distance between the two limit bars on the same side of the U-shaped frame is greater than or equal to the width of the excitation light source layer.

[0017] By adopting the above technical solution, the limit strip is used to limit the installation position of the adsorption layer, avoiding the adsorption layer from being installed too deep and contacting with the ultraviolet light source, affecting the catalytic effect inside, and reserving a working gap for the excitation light source layer to ensure the safe use of the excitation light source layer.

[0018] Furthermore, a plurality of mounting slots extend from the mounting block, the mounting slots are arranged corresponding to the ultraviolet light source and the ultraviolet light source is snap-connected and arranged in the mounting slots, and fixed edges extend around the mounting slots, and the fixed edges connect and fix the outer side surfaces of the mounting slots and the upper surface of the mounting block.

[0019] By adopting the above technical solution, the mounting slot is used to fix the ultraviolet light source to ensure that it is vertical on the inner wall of the filter frame, and the fixed edge increases the firmness of the mounting block to ensure the stability of the ultraviolet light source base.

[0020] Furthermore, a plurality of snap-fit ​​seats are provided at the bottom of the top frame corresponding to the ultraviolet light source, and the snap-fit ​​seats are extended at the bottom of the top frame and are in a circular ring shape. Snap-fit ​​feet extend downward at both ends of the top frame and are inserted into the openings of the U-shaped frame.

[0021] By adopting the above technical solution, the snap-fit ​​seat cooperates with the mounting block at the bottom of the ultraviolet light source to limit the position of the ultraviolet light source to ensure that it is firmly fixed between the two adsorption layers, ensuring that the ultraviolet light source can illuminate the inside of the adsorption layer and ensuring its internal use effect.

[0022] In summary, the technical solution of the utility model has the following advantages:

[0023] 1. The formaldehyde decomposition filter provided by the utility model integrates the method of activated carbon adsorption and ultraviolet catalysis, and adopts adsorption first and then catalytic decomposition, which can completely decompose formaldehyde into carbon dioxide and water, thereby achieving the purpose of thorough purification.

[0024] 2. The formaldehyde decomposition filter provided by the utility model has a spiral filter hole relative to the conventional straight hole structure, so that the polluted gas entering the honeycomb can increase the contact area with the honeycomb block, thereby improving the adsorption effect of a single honeycomb block and ensuring the low resistance of the overall filter net to avoid the influence of excessive wind resistance on the filtering effect. At the same time, since the filter hole is spiral, the leakage of internal ultraviolet light can be avoided, ensuring safety and the utilization rate of ultraviolet light.

[0025] 3. The formaldehyde decomposition filter provided by the utility model has spiral filter holes, which are convenient for processing and operation during manufacture. The filter can be removed in a spiral manner after the honeycomb block is pressed and processed, and the process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of a formaldehyde decomposition filter provided in one embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the explosion structure of a formaldehyde decomposition filter provided in one embodiment of the utility model;

[0029] Figure 3 A schematic diagram of a partial structure of an activated carbon block provided in one embodiment of the utility model;

[0030] Figure 4 The figure is a schematic cross-sectional structure diagram of a honeycomb block provided in one embodiment of the present utility model.

[0031] Description of reference numerals:

[0032] 1. Filter frame; 2. U-shaped frame; 21. Guide groove; 22. Limiting strip; 3. Top frame; 31. Snap-fit ​​seat; 32. Snap-fit ​​foot; 4. Adsorption layer; 5. Activated carbon layer; 51. Activated carbon block; 511. Honeycomb block; 512. Filter hole; 52. Reinforcement frame; 6. Catalytic layer; 7. Excitation light source layer; 71. Ultraviolet light source; 72. Mounting block; 721. Mounting slot; 722. Fixed edge. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] A formaldehyde decomposition filter, such as Figure 1 and Figure 2As shown, it includes a filter frame 1, two adsorption layers 4 and an excitation light source layer 7. The adsorption layer 4 and the excitation light source layer 7 are both embedded in the filter frame 1. The filter frame 1 is rectangular and is covered on the adsorption layer 4 and the excitation light source layer 7. The adsorption layer 4 is arranged on the front and back sides of the excitation light source layer 7. The excitation light source layer 7 includes a plurality of ultraviolet light sources 71 and a mounting block 72. The ultraviolet light sources 71 are arranged in an array along the length direction of the filter frame 1. The height of the ultraviolet light sources 71 is less than the height of the filter frame 1. The mounting block 72 is arranged at the bottom of the filter frame 1 and the ultraviolet light sources 71 are all snap-connected on the mounting block 72. When the polluted gas passes through the front adsorption layer 4, the formaldehyde captured by the adsorption layer 4 will be catalytically decomposed by the inner excitation light source layer 7, and the ozone generated by the ultraviolet light source 71 will be adsorbed and oxidized by the rear adsorption layer 4. Multiple adsorption and catalytic treatments, the method of integrating activated carbon adsorption and ultraviolet catalysis, and the method of first adsorption and then catalytic decomposition are adopted to completely decompose the formaldehyde into carbon dioxide and water, thereby achieving the purpose of complete purification.

[0035] like Figure 1 and Figure 2 As shown, the filter frame 1 includes a U-shaped frame 2 and a top frame 3 that are snap-fitted, the top frame 3 being snap-fitted at the top of the opening of the U-shaped frame 2, the U-shaped frame 2 opening being upwardly disposed and guide grooves 21 being disposed on both sides of the opening, the guide grooves 21 being located on the side of the adsorption layer 4 away from the excitation light source layer 7. The snap-fitted U-shaped frame 2 and the top frame 3 are easy to disassemble, and the guide grooves 21 are also easy to install the adsorption layer 4.

[0036] Limiting bars 22 are arranged on opposite sides of the U-shaped frame 2, and the limiting bars 22 are arranged along the height direction of the U-shaped frame 2. The limiting bars 22 are arranged corresponding to the adsorption layer 4 on each side, and the distance between the two limiting bars 22 on the same side of the U-shaped frame 2 is greater than or equal to the width of the excitation light source layer 7. The limiting bars 22 are used to limit the installation position of the adsorption layer 4, to prevent the adsorption layer 4 from being installed too deep and contacting the ultraviolet light source 71, affecting the catalytic effect inside, and to reserve a working gap for the excitation light source layer 7 to ensure the safety of the excitation light source layer 7.

[0037] A plurality of mounting slots 721 extend from the mounting block 72, and the mounting slots 721 are arranged corresponding to the ultraviolet light source 71 and the ultraviolet light source 71 is arranged in the mounting slots 721. A plurality of fixing edges 722 extend around the mounting slots 721, and the fixing edges 722 connect and fix the outer side surface of the mounting slots 721 and the upper surface of the mounting block 72. The mounting slots 721 are used to fix the ultraviolet light source 71 to ensure that it is vertical on the inner wall of the filter frame 1, and the fixing edges 722 increase the firmness of the mounting block 72 and ensure the stability of the base of the ultraviolet light source 71.

[0038] A plurality of snap-fit ​​seats 31 are provided at the bottom of the top frame 3 corresponding to the ultraviolet light source 71. The snap-fit ​​seats 31 are extended at the bottom of the top frame 3 and are in a circular ring shape. The two ends of the top frame 3 extend downward with snap-fit ​​feet 32 ​​inserted into the opening of the U-shaped frame 2. The snap-fit ​​seats 31 cooperate with the mounting blocks 72 at the bottom of the ultraviolet light source 71 to limit the position of the ultraviolet light source 71 to ensure that it is firmly fixed between the two adsorption layers 4, and to ensure that the ultraviolet light source 71 can irradiate the inner side of the adsorption layer 4, thereby ensuring the internal use effect.

[0039] like Figure 2 , Figure 3 and Figure 4 As shown, each side of the adsorption layer 4 includes an activated carbon layer 5 and a catalytic layer 6. The catalytic layer 6 is arranged on the side close to the excitation light source layer 7 and sprayed on the activated carbon layer 5. The catalytic layer 6 is a photocatalyst material such as titanium dioxide. Titanium dioxide and other photocatalyst materials are sprayed on the side of the activated carbon layer 5 close to the excitation light source layer 7, so that after the activated carbon layer 5 adsorbs formaldehyde, the formaldehyde captured by the activated carbon layer 5 can be effectively decomposed into water and carbon dioxide in combination with the photocatalyst material and the ultraviolet light source 71, thereby extending the service life of the entire filter.

[0040] The activated carbon layer 5 includes a plurality of bonded activated carbon blocks 51, each of which is surrounded by a reinforcement frame 52, which is rectangular and embedded on the outside of the activated carbon block 51. The plurality of activated carbon blocks 51 form an integral activated carbon layer 5, which is convenient for adjusting the size of the filter screen according to needs and adapting to different filters.

[0041] The activated carbon block 51 includes a plurality of honeycomb blocks 511 connected at the sides, and filter holes 512 are formed through the honeycomb blocks 511. The filter holes 512 are spiral-shaped and have a pore size of 5mm-10mm. The filter holes 512 are arranged axially perpendicular to the outer side of the activated carbon block 51. Compared with the conventional straight hole structure, the spiral filter holes 512 can increase the contact area between the polluted gas entering the honeycomb and the honeycomb block 511, thereby improving the adsorption effect of a single honeycomb block 511, and ensuring the low resistance of the overall filter screen, avoiding the influence of excessive wind resistance on the filtering effect; at the same time, since the filter holes 512 are spiral-shaped, the leakage of internal ultraviolet light can be avoided, ensuring safety and the utilization rate of ultraviolet light; during production, the spiral filter holes 512 are easy to process and can be removed by spiral means after the honeycomb block 511 is pressed and processed, and the process is simple.

[0042] The working principle and use method of the formaldehyde decomposition filter net are as follows: the corresponding activated carbon blocks 51 are pressed and spiral filter holes 512 are opened. The activated carbon blocks 51 are spliced ​​according to the needs to form an activated carbon layer 5. The catalytic layer 6 is sprayed on one side of the activated carbon layer 5 to form an adsorption layer 4. First, the ultraviolet light source 71 is installed on the installation block 72, and then the adsorption layers 4 on both sides are inserted. In order to ensure the firmness, glue is applied and finally the top frame 3 is closed to complete the installation of the filter net.

[0043] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A formaldehyde decomposition filter, characterized in that: The invention comprises a filter frame (1), two adsorption layers (4) and an excitation light source layer (7); the adsorption layer (4) and the excitation light source layer (7) are both embedded in the filter frame (1); the filter frame (1) is rectangular and covers the adsorption layer (4) and the excitation light source layer (7); the adsorption layer (4) is arranged on two opposite sides of the excitation light source layer (7); the excitation light source layer (7) comprises a plurality of ultraviolet light sources (71) and a mounting block (72); a plurality of ultraviolet light sources (71) are arranged in an array along the length direction of the filter frame (1); the height of the ultraviolet light sources (71) is less than the height of the filter frame (1); the mounting block (72) is arranged at the bottom of the filter frame (1); and the ultraviolet light sources (71) are all embedded on the mounting block (72).

2. A formaldehyde decomposition filter according to claim 1, characterized in that: The adsorption layer (4) on each side comprises an activated carbon layer (5) and a catalytic layer (6); the catalytic layer (6) is arranged on a side close to the excitation light source layer (7) and is sprayed on the activated carbon layer (5); and the catalytic layer (6) is titanium dioxide.

3. A formaldehyde decomposition filter according to claim 2, characterized in that: The activated carbon layer (5) comprises a plurality of bonded and fixed activated carbon blocks (51), each of the activated carbon blocks (51) being surrounded by a reinforcement frame (52), the reinforcement frame (52) being rectangular and embedded on the outside of the activated carbon block (51).

4. A formaldehyde decomposition filter according to claim 3, characterized in that: The activated carbon block (51) comprises a plurality of honeycomb blocks (511) connected to each other at the sides, each of the honeycomb blocks (511) being provided with a filter hole (512), the filter hole (512) being spiral-shaped and having a hole diameter of 5 mm to 10 mm, and the filter hole (512) being axially arranged perpendicular to the outer side surface of the activated carbon block (51).

5. The formaldehyde decomposition filter according to claim 1, characterized in that: The filter frame (1) comprises a U-shaped frame (2) and a top frame (3) which are arranged in a snap-fitting manner, wherein the top frame (3) is snap-fitted to the top of the opening of the U-shaped frame (2), the opening of the U-shaped frame (2) is arranged upward and guide grooves (21) are arranged on both sides of the opening, and the guide grooves (21) are located on a side of the adsorption layer (4) away from the excitation light source layer (7).

6. A formaldehyde decomposition filter according to claim 5, characterized in that: Limiting bars (22) are arranged on two opposite sides of the U-shaped frame (2), the limiting bars (22) are arranged along the height direction of the U-shaped frame (2), the limiting bars (22) are arranged corresponding to the adsorption layer (4), and the distance between the two limiting bars (22) on the same side of the U-shaped frame (2) is greater than or equal to the width of the excitation light source layer (7).

7. A formaldehyde decomposition filter according to claim 6, characterized in that: A plurality of mounting slots (721) extend from the mounting block (72), the mounting slots (721) are arranged corresponding to the ultraviolet light source (71), and the ultraviolet light source (71) is snap-fitted and arranged in the mounting slots (721), and fixed edges (722) extend around the mounting slots (721), and the fixed edges (722) are connected to fix the outer side surface of the mounting slots (721) and the upper surface of the mounting block (72).

8. A formaldehyde decomposition filter according to claim 7, characterized in that: A plurality of snap-fit ​​seats (31) are arranged at the bottom of the top frame (3) corresponding to the ultraviolet light source (71); the snap-fit ​​seats (31) are extended at the bottom of the top frame (3) and are in a circular ring shape; snap-fit ​​feet (32) extend downward at both ends of the top frame (3) and are inserted into the opening of the U-shaped frame (2).

Images