CN100441966C - Vertical Photocatalytic Air Purifier - Google Patents

Abstract

A vertical photocatalytic air purifier belongs to the technical field of air purification. Including the organic casing (1), the air inlet door (11) at the lower part of the casing, the primary filter screen (12), the cross-flow fan (3), the fan motor (2) and the air flow guide casing (4), the upper part of the casing The air outlet (14) and the circuit board (15) are characterized in that it also contains: a medium-efficiency filter screen (6) on the upper part of the nest shell, which is at an angle of less than 90° to the horizontal plane; fixed on the upper end surface of the nest shell, the other side A deflector (5) perpendicular to the front direction of the medium-efficiency filter; a plasma dust collector (7) above the medium-efficiency filter; a photocatalytic unit composed of a photocatalytic honeycomb filter (8) and an ultraviolet lamp (9) and The activated carbon filter screen (10) positioned above it; the negative ion generator (13) positioned at the air outlet side. This structure integrates different purification technologies and exerts their synergistic principle to completely eliminate various indoor pollutants and achieve the purpose of purifying the air.

Description

Vertical Photocatalytic Air Purifier

Technical field:

The invention belongs to the technical field of air purifiers, in particular to the technical field of manufacturing a multifunctional air purifier.

Background technique:

The source of indoor air pollution includes dust, fiber, odor, odor, bacteria, virus and other substances, but the harm to human health mainly lies in the indoor suspended inhalable particles. This is because bacteria, spirochetes, viruses and other microorganisms that cause damage to human health, although their size is only between 0.01 and 10 microns, they cannot exist alone in the air and often adsorb on the surface of particles several times larger than them. Traditional air purifiers use air blowers to pass air through porous filter materials (materials such as non-woven fabrics, filter paper, fiber or foam filter materials), thereby separating pollutants from the air to achieve the purpose of purification, or through corona The discharge makes the pollutants in the air charged, and the dust collection device is used to capture the charged particles to purify the air. However, this kind of purifiers on the market that use physical filtration, adsorption, electrostatic condensation to remove dust and other single or comprehensive functions, although effective to a certain extent, only transfer pollutants, and cannot treat odors, pathogenic bacteria, Pollution caused by viruses, microorganisms, etc. is fundamentally eliminated.

At present, the second generation of air purifiers has entered the market in the first three years. It is an air purifier with ozone and negative ions as its main functions. Ozone has the functions of disinfection, sterilization, deodorization, deodorization and depigmentation. Therefore, the combination of ozone and negative ion smoke and dust removal and other advanced physical filtration or dust removal methods is an ideal air purifier today. However, when the ozone concentration reaches 0.15PPM, it will have harmful effects on the human body. Therefore, when ozone is generally used for indoor sterilization, personnel should not be active indoors.

The most advanced air purifier is a photocatalytic air purifier that integrates smoke elimination, dust removal, sterilization and detoxification, deodorization and deodorization, and decomposition of organic pollutants. This type of air purifier is different from the first generation of physical air purifiers and the second generation of ozone and negative ion air purifiers. Its purification structure is sterilizing light and deodorizing sterilizing filter, which has the functions of sterilization, disinfection, deodorization and dust removal. Hydroxyl radical ion is a chemical substance that directly sterilizes and disinfects. It directly decomposes organic matter and first destroys the cell membrane of bacteria. , and then decompose the organic matter in the bacteria, and directly coagulate the protein of the virus, and the final products are CO ₂ and H ₂ O. Compared with ordinary photocatalytic products, the advantage of nanophotocatalysis is that it can achieve self-regeneration, and the reduction rate is greatly improved, while the hydroxyl radical ion itself is non-toxic, does not decompose, does not overflow, and does not produce toxins. After testing, this technology can effectively kill nearly ten kinds of common germs, and is effective against tuberculosis virus, influenza virus, hepatitis B virus and SARS virus. Photocatalysis is a high-tech product that has the function of decomposing organic pollutants. Photocatalysis is coupled with plasma dust removal, so that a small amount of ozone generated by plasma dust removal enters the photocatalytic reaction device, which accelerates the electrons generated on the surface of the catalyst under the action of light excitation- The separation of hole pairs improves the efficiency of the purifier in decomposing organic pollutants, sterilizing and deodorizing, etc. In this way, combined with some physical methods of dust removal and smoke removal, it becomes an all-round and multi-functional air purifier.

The basic principle of photocatalytic air purification is based on semiconductor theory. TiO ₂ is an N-type semiconductor material with a band gap energy of 3.2ev, which is equivalent to light with a wavelength of 380nm. When the ultraviolet light with a wavelength less than 380nm irradiates the surface of TiO ₂ , photoinduced electrons (e _CB ^- ) and holes (h _VB ⁺ ) will be generated on the surface of TiO ₂ . Electrons and holes can migrate to the solid surface to interact with dissolved oxygen and adsorbed water on the surface to generate highly active free radicals, ·OH, ·O ₂ ^- , as shown in Figure 1, ·OH has a strong Oxidation ability, its reaction energy is 120kcal/mol, which is higher than various chemical bonds, such as CC (83kcal/mol), CH (99kcal/mol), CN (73kcal/mol), CO (84kcal/mol), HO (111kcal/mol) mol), NH (93kcal/mol), so it can completely decompose various organic substances, and finally generate CO ₂ and H ₂ O, so as to kill bacteria and viruses and eliminate indoor pollution.

The application of photocatalytic technology to indoor air purification is an innovation in air purification technology in recent years. Most of the currently published patents are small desktop photocatalytic air purifiers, which deal with a small amount of air and have limited pollutant treatment efficiency. Patent 01276442.6 discloses a vertical nano-photocatalytic electrostatic air purifier, which integrates high-voltage electrostatic dust removal technology and photocatalytic technology to achieve air purification. The structural design of the purifier has the following problems: (1) The air-passing area of pollutants is small under the same volume of the purifier; (2) The high-voltage electrostatic precipitator will generate ozone, which is harmful to the human body; (3) The structure of the photocatalytic chamber Complicated; (4) There is no active carbon filter layer, and the untreated gas after the electrostatic-photocatalytic layer cannot be eliminated at one time. In addition, since the photocatalytic reaction is a wall reaction, whether the pollutants can fully contact the catalyst surface and whether the photons emitted by the light source can be fully utilized will directly affect the photocatalytic purification efficiency, and these are related to the structural design of the purifier. direct cause and effect.

Invention content:

Aiming at the above problems existing in current photocatalytic air purifiers, the present invention designs a large-scale vertical photocatalytic air purifier, optimizes its internal structure, and improves the air volume and purification efficiency of pollutants. The invention is a vertical multifunctional photocatalytic air purifier integrating various purification technologies, which has a small footprint, a large processing air volume, a large applicable building area and high air purification efficiency. It includes a vertical casing, a flexible detachable air inlet door installed on the lower side of the casing, a flexible detachable primary filter in the inner groove of the air inlet door, a fan and a fan nest installed behind the primary filter, There is a deflector on the upper part of the nest shell, a medium-efficiency filter placed obliquely, a plasma dust collector, at least two layers of photocatalytic honeycomb filters and an ultraviolet lamp, an air outlet on the upper part of the casing, and an air outlet arranged inside the casing. Negative ion generator and circuit control board near the tuyere.

Referring to Fig. 2 and Fig. 3 for the technical characteristics of the present invention, the vertical photocatalytic air cleaner designed by the present invention includes a casing 1, an air inlet door 11 arranged in sequence along the air flow direction installed on the bottom of the casing, and a primary filter screen 12 , the cross-flow fan 3, the fan motor 2 and the air flow guide casing 4, the upper part of the casing is arranged with an air outlet 14 and a circuit board 15 for controlling the work of the purifier, and it is characterized in that it also contains: the upper part of the casing 4 1. An intermediate-efficiency filter screen 6 fixed in the casing 1 and having an inclination angle of less than 90° with the horizontal plane; one side is fixed on the upper end surface of the casing 4, and the other side is located in the upstream direction of the airflow flow of the intermediate-effect filter screen 6 The deflector 5 on one side; the plasma dust remover 7 on the medium-efficiency filter screen 6; the photocatalytic purification that is positioned on the plasma dust remover 7 and consists of at least two photocatalytic honeycomb filter screens 8 and an ultraviolet lamp 9 Unit, wherein the ultraviolet lamp 9 is placed in the middle of two filter screens 8, and both are fixed in the casing 1; the activated carbon filter screen 10 located above the photocatalytic honeycomb filter screen 8 and fixed on the inside of the casing 1 ; Be fixed on the casing 1 and be positioned at the negative ion generator 13 of air outlet 14 one sides.

The photocatalytic honeycomb purification filter screen 8 in the present invention is a honeycomb porous structure, and the hole shape is any one of triangle, square, polygon, circle or corrugated shape, and the honeycomb material is aluminum, paper, pottery, plastic, fiber And any one of non-woven fabrics. The side length of each square hole of the photocatalytic honeycomb filter 8 is less than 5 mm, and the ratio of the thickness of the filter screen to the side length of the hole is less than 8.

The main wavelength of the ultraviolet lamp 9 in the present invention is between 230-420nm, and the distance between the ultraviolet lamp 9 and the adjacent photocatalytic honeycomb filter screen 8 is 10mm-60mm.

The included angle between the medium-efficiency filter screen 6 and the horizontal plane in the present invention is 20°-80°.

The oblique placement of the vertical photocatalytic air purifier increases the contact surface area between the airflow and the catalyst, prolongs the service life of the filter, increases the amount of pollutants treated, and improves the purification efficiency. The purifier is effective for formaldehyde and nitrogen oxides , sulfur dioxide and other pollutants have a good removal effect.

Description of drawings

Figure 1 shows the principle of photocatalytic air purification;

Fig. 2 is the side view of the structure of the photocatalytic air cleaner of the present invention after removing the front panel;

1-casing, 2-fan motor, 3-cross-flow fan, 4-casing, 5-deflector, 6-medium efficiency filter, 7-plasma dust collector, 8-photocatalytic honeycomb filter, 9- Ultraviolet lamp, 10-activated carbon filter screen, 11-air intake door, 12-primary effect filter screen, 13-negative ion generator, 14-air outlet, 15-circuit control board.

Fig. 3 is the cut-away front view of photocatalytic air cleaner of the present invention;

Fig. 4 is photocatalytic air purifier of the present invention to the degradation effect of pollutant formaldehyde;

Fig. 5 is that photocatalytic air purifier of the present invention is to pollutant SO _Degradation effect;

Fig. 6 is the degradation effect of the photocatalytic air purifier of the present invention on pollutant _NOx .

Detailed ways:

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

The implementation of the technical solution of the present invention is specifically referred to in Fig. 2 and Fig. 3 . On the basis of the prior art, the structural feature of the present invention is that there is a deflector 5 on the top of the socket shell 4, and the airflow direction through the deflector 5 is perpendicular to the medium-efficiency filter 6 placed obliquely, and the medium-efficiency filter 6 , The plasma dust collector 7, the photocatalytic honeycomb filter screen 8 and the horizontal plane are at an angle of 45 degrees, which improves the contact area between the pollutants and the catalyst. Negative ion generator 13 is arranged near the airflow outlet to increase the concentration of negative ions in the air. The photocatalytic purification unit in FIG. 2 includes three photocatalytic honeycomb filter screens 8 and two rows of four ultraviolet lamps 9 , and the ultraviolet lamps 9 are placed in the center of the photocatalytic honeycomb filter screen 8 in parallel. In this embodiment, in order to improve the purification efficiency, the number of photocatalytic honeycomb filter screens 8 and ultraviolet lamps 9 can be increased, and photocatalytic honeycomb filter screens 8 and light sources 9 can be arranged in parallel in two or more groups. The photocatalytic honeycomb filter 8 is based on honeycomb aluminum, honeycomb paper, honeycomb ceramics, and non-woven fabrics. The combination of the catalyst and the substrate can be a physical method, a chemical method, or a combination of a physical method and a chemical method. In addition, the activated carbon filter screen 10 of the present invention can also be vertically placed on the inside of the outlet 14 with the horizontal plane, and fixed on the casing 1, while the medium-efficiency filter screen 6, the plasma dust collector 7, the photocatalytic purification unit, and the activated carbon filter The spatial position of the mesh 10 can be interchanged.

The working process of the photocatalytic air purifier of the present invention is that under the action of the cross-flow fan 3, the gas first passes through the primary filter screen 12 to filter, and then flows through the medium-efficiency filter screen 6 through the nest shell 4 under the action of the deflector 5 , the plasma dust removal net 7 removes more than 90% of the dust, and the polluted gas after dust removal is photocatalytically degraded under the action of the photocatalytic honeycomb filter 8 and the ultraviolet lamp 9, and a small amount of polluted gas that has not been photocatalytically oxidized is degraded at the outlet Activated carbon filter screen 10 is adsorbed, thereby obtains clean gas.

The invention integrates filtration, plasma dedusting, photocatalytic oxidation, and adsorption technologies. The inclined placement method increases the contact surface area between the airflow and the catalyst, makes the airflow fully contact with the surface of the catalyst, and increases the contact area of pollutants. The service time of the filter is extended, the pollutant treatment capacity is increased, and the purification efficiency is improved. The photocatalytic coating obtained by using physical coating film, chemical coating film or a combination of physical coating film and chemical coating film not only ensures the activity of the catalyst, but also ensures that the catalyst film has a certain degree of firmness. The present invention has very good removal effect on pollutants such as formaldehyde, nitrogen oxide, sulfur dioxide, detailed description is as follows:

Figure 4 shows the degradation effect of the photocatalytic air cleaner of the present invention on the pollutant formaldehyde. Put the photocatalytic air purifier of the present invention into a glass sealed chamber of 4 cubic meters, pass a certain concentration of formaldehyde pollution gas into the sealed chamber, and open the purifier after the pollutants are adsorbed and balanced to obtain the photocatalytic removal effect of pollutants , as can be seen from Figure 4, more than 50% of formaldehyde pollutants were removed within 30 minutes.

What Fig. 5 shows is the degradation effect of the photocatalytic air cleaner of the present invention on pollutant SO ₂ . Put the photocatalytic air purifier of the present invention into a glass sealed chamber of 4 cubic meters, pass a certain concentration of sulfur dioxide polluting gas into the sealed chamber, and open the purifier after the pollutants are adsorbed and balanced to obtain the photocatalytic concentration of the pollutants. As for the removal effect, it can be seen from Figure 5 that more than 98% of the sulfur dioxide was removed within 25 minutes.

Fig. 6 shows the degradation effect of the photocatalytic air purifier of the present invention on pollutant _NOx . Put the photocatalytic air purifier of the present invention into a glass sealed chamber of 4 cubic meters, pass a certain concentration of nitrogen oxide gas into the sealed chamber, and turn on the purifier when the pollutants are adsorbed and balanced to obtain the light of the pollutants. Catalytic removal effect, as can be seen from Figure 6, each component in nitrogen oxides was removed to varying degrees within 30 minutes.

Claims (6)

1. A vertical photocatalytic air purifier, including a casing (1), an air inlet door (11) installed in the lower part of the casing along the flow direction of the airflow, a primary filter (12), a cross-flow fan (3), The blower motor (2) and the airflow guide casing (4) are arranged with an air outlet (14) and a circuit board (15) for controlling the work of the purifier on the upper part of the casing, and it is characterized in that it also contains: 4) The upper medium-efficiency filter screen (6) that is fixed in the casing (1) and has an inclination angle of less than 90° with the horizontal plane; one side is fixed on the upper end surface of the casing (4), and the other side is in the middle Efficiency filter screen (6) is positioned at the deflector (5) of one side of the upstream direction of air flow; The plasma dust collector (7) that is positioned at medium efficiency filter screen (6) top; Be positioned at plasma dust collector (7), A photocatalytic unit consisting of at least two photocatalytic honeycomb filter screens (8) and an ultraviolet lamp (9), wherein the ultraviolet lamp (9) is placed between the two filter screens (8), and both are fixed In the casing (1); the active carbon filter (10) positioned above the photocatalytic honeycomb filter (8) and fixed on the inside of the casing (1); fixed on the casing (1) and positioned at the air outlet (14 ) the negative ion generator (13) on one side. 2. The vertical photocatalytic air purifier according to claim 1, characterized in that: the photocatalytic honeycomb filter screen (8) is a honeycomb porous structure, and the hole shape is triangle, square, polygon, circle or Any one of the corrugated shapes, and the honeycomb material is any one of aluminum, paper, ceramics, plastics, fibers and non-woven fabrics. 3. according to the described vertical photocatalytic air purifier of claim 1 or 2, it is characterized in that each square hole side length of described photocatalytic honeycomb filter screen (8) is less than 5mm, and filter screen thickness and hole side length The ratio is less than 8. 4. The vertical photocatalytic air cleaner according to claim 1, characterized in that the dominant wavelength of the ultraviolet lamp (9) is between 230 and 420 nanometers. 5. The vertical photocatalytic air cleaner according to claim 1 or 4, characterized in that the distance between the ultraviolet lamp (9) and the adjacent photocatalytic honeycomb filter screen (8) is 10 mm to 60 mm. 6. The vertical photocatalytic air cleaner according to claim 1, characterized in that the angle between the medium-efficiency filter (6) and the horizontal plane is 20°-80°.

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