A photocatalytic air purifier

Abstract

The present invention relates to the field of air purification, and specifically provides a photocatalytic air purifier, comprising: a shell, an air inlet, a fixed fan blade, a rotating fan blade, a transparent hollow shaft, a light source, a photocatalyst, a motor, and a rotating table. The shell is a hollow open cylindrical shape, the air inlet is arranged on the side of the shell away from the open end, the fixed fan blade is fixedly arranged on the inner wall of the shell side, the motor is fixedly arranged on the inner wall of the shell bottom surface, the rotating table is fixedly arranged on the side of the motor close to the shell open, the transparent hollow shaft is fixedly arranged on the rotating table, the rotating fan blade is fixedly arranged on the outer surface of the transparent hollow shaft, the fixed fan blade and the rotating fan blade are not in contact with each other, the photocatalyst is fixedly arranged on the surface of the fixed fan blade and the rotating fan blade, the light source is fixedly arranged inside the transparent hollow shaft through the inner wall of the transparent hollow shaft, and the motor and the light source are connected to a power supply. The air purifier of the present application has a high purification efficiency.

Description

Technical Field

[0001] The present invention relates to the field of air purification, and in particular to a photocatalytic air purifier. Background Art

[0002] Due to poor air quality, renovation, long-term use of air conditioning and other reasons, the air contains particulate matter such as dust, pollen, and dust, harmful gases such as formaldehyde, benzene, and xylene, and microbial viruses, which are very harmful to the human body or electrical equipment. It is very necessary to remove harmful indoor pollutants, and a common purification device is an air purifier. The air purifier removes harmful pollutants from the air through activated carbon, catalysts, etc. Specifically, under the action of the suction device, the gas to be purified enters the air inlet of the air purifier, and the air entering the air purifier passes through the filter device arranged inside the air purifier to remove harmful pollutants in the air. The purified air is discharged from the air outlet of the air purifier. The circulating work makes the harmful pollution in the air less and less, thereby achieving the purpose of purifying the air.

[0003] The filter device is generally a multi-layer mesh structure with a high density. A catalyst is set in the mesh structure to play a catalytic role. Particulate pollutants such as dust are generally removed by activated carbon, and the removal effect is relatively good. For organic pollutants such as formaldehyde, benzene, and xylene, a catalyst is required to effectively remove them. A common catalyst is a photocatalyst, which is a general term for a class of nano-scale semiconductors represented by TiO2. When light is irradiated on the surface of the photocatalyst, photogenerated electrons and holes with strong oxidizing and reducing abilities are generated. The photogenerated electrons react with oxygen in the air to generate oxygen anions, and the photogenerated holes react with water molecules in the air to generate hydroxyl radicals. The oxygen anions and hydroxyl radicals generated by the redox reaction can combine with organic pollutants in the air such as formaldehyde, benzene, and xylene to generate carbon dioxide and water, thereby converting harmful pollutants into non-toxic and harmless carbon dioxide and water, playing a role in purifying the air.

[0004] However, in order to improve the air purification efficiency, existing air purifiers set the spacing and grid of the multi-layer mesh structure of the photocatalyst to less than 3mm, or even in the micron level, and the overall thickness is relatively thick. The thickness of the mesh structure of household air purifiers is more than 10cm. Since the photocatalytic reaction requires oxygen and water molecules in the air, when the air flows through the middle position of the multi-layer mesh structure, the concentration of oxygen and water molecules in the air is low. The occurrence of the photocatalytic reaction follows the principle of entropy increase and the law of conservation of energy. As the concentration of oxygen and water molecules in the air decreases, the photocatalytic reaction proceeds in reverse, thereby reducing the photocatalytic efficiency and reducing the overall purification efficiency.

[0005] In summary, in the structure of the existing air purifier, the concentration of substances that need to participate in the photocatalytic reaction around the photocatalyst is reduced, resulting in insufficient photocatalytic reaction, thereby reducing the purification efficiency. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a photocatalytic air purifier. The air purifier of the present invention includes: a shell, an air inlet, fixed blades, rotating blades, a transparent hollow shaft, a light source, a photocatalyst, a motor, and a rotating table. The shell is a hollow open cylindrical shell. The air inlet is arranged on the side of the shell away from the open end. An activated carbon filter is fixedly provided on the inner side of the air inlet. A grid baffle is provided at the open end of the shell. The grid baffle and the shell are detachably connected and may be threaded. The activated carbon filter is used to remove particulate pollutants in the air for preliminary purification. The fixed blades are fixedly provided on the inner wall of the side of the shell. The number of groups of fixed blades is greater than or equal to two groups. The plane where the contact point of each group of fixed blades with the shell is located is perpendicular to the central axis of the shell. The motor is fixedly mounted on the inner wall of the bottom surface of the housing, the turntable is fixedly mounted on the side of the motor close to the open end of the housing, the transparent hollow shaft is fixedly mounted on the turntable, the inner wall of one end of the transparent hollow shaft is adhesively fixedly connected to the side of the turntable, the turntable is cylindrical in shape, and the straight line on which the motor shaft is located, the central axis of the turntable, the central axis of the transparent hollow shaft, and the central axis of the housing are all collinear. The rotating blades are fixedly mounted on the outer surface of the transparent hollow shaft, the number of groups of rotating blades is greater than or equal to three, and the plane on which the contact point of each group of rotating blades with the transparent hollow shaft is perpendicular to the central axis of the transparent hollow shaft. The direction of rotation of the blade group at one end of the rotating blade away from the bottom of the housing is different from the direction of rotation of the remaining rotating blade groups. There is no contact between the fixed blades and the rotating blades. The material of the transparent hollow shaft is a transparent material, specifically, it can be hard plastic or glass. The transparent hollow rotating shaft has a circular cross-sectional shape along the vertical direction of its central axis. The light source is fixedly arranged inside the transparent hollow rotating shaft through the inner wall of the transparent hollow rotating shaft. The light source can be an ultraviolet light source, an ultraviolet-visible light source, a columnar light source, or an LED light source. A photocatalyst is applied to the surface of the fixed fan blade and the rotating fan blade using techniques such as spraying and spin coating. The photocatalyst is nano-sized titanium dioxide. Under the action of light, the photocatalyst and the air to be purified produce a photocatalytic reaction. Specifically, light irradiates the photocatalyst, causing the electrons in the photocatalyst to transition from the valence band to the conduction band, forming photogenerated electrons and photogenerated holes. The photogenerated electrons react with oxygen in the air to generate oxygen anions, and the photogenerated holes react with water molecules in the air to generate hydroxyl radicals. The generated oxygen anions and hydroxyl radicals react with organic pollutants in the air to generate pollution-free carbon dioxide and water, achieving the purpose of purifying the air. The motor and light source are connected to a power supply to form an electrical circuit.

[0007] Beneficial effects of the present invention: The present invention provides a photocatalytic air purifier. In the present invention, a photocatalyst is fixedly arranged on the surface of the rotating fan blades and the fixed fan blades. Under the action of light, the air passes through the photocatalyst and, through the photocatalytic reaction, converts the organic pollutants in the air into carbon dioxide and water. When the air purifier of the present application is working, the air has a strong fluidity, which provides a continuous supply of reactants required for the photocatalytic reaction, such as oxygen and water molecules, and does not cause the photocatalytic reaction to proceed in reverse, thereby causing the photocatalytic reaction to proceed insufficiently and the purification efficiency to decrease. Therefore, the air purifier of the present application has a high purification efficiency.

[0008] The present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of a photocatalytic air purifier provided by the present application;

[0010] Figure 2 This is a schematic diagram of the internal structure of a photocatalytic air purifier provided in this application.

[0011] In the figure: 1. Outer casing; 11. Air inlet; 2. Rotating part; 21. Transparent hollow shaft; 22. Rotating fan blades; 3. Fixed fan blades; 4. Rotating table; 5. Motor; 6. Grid baffle. DETAILED DESCRIPTION

[0012] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0013] Example 1

[0014] The present invention provides a photocatalytic air purifier, such as Figure 1 and Figure 2As shown, it includes a housing 1, an air inlet 11, a rotating part 2, a fixed fan blade 3, a rotating table 4, a motor 5, and a grid baffle 6, wherein the rotating part 2 includes a transparent hollow rotating shaft 21 and a rotating fan blade 22. The air purifier of the present application also includes activated carbon filter cotton, a light source, and a photocatalyst. The housing 1 is a cylindrical housing with an open end, and a circle of protrusions is provided around the side of the closed end, serving as the air inlet 11. Specifically, a slit with the same direction is provided on the protruding plane for air to enter the interior of the air purifier of the present invention. The direction of the slit can be parallel to the central axis direction of the cylindrical housing, or perpendicular to the central axis direction of the cylindrical housing, or at a certain angle to the central axis direction of the cylindrical housing. The grid baffle 6 is detachably fixed to the open end of the housing 1, and can be connected by threads. The shape and size match the shape and size of the open end of the housing 1. The structure of the grid baffle 6 is a mesh structure, so that the purified air can be discharged from the grid baffle 6, while also preventing debris from falling into the upper port of the air purifier. The shell 1 and the grid baffle 6 are made of hard materials, specifically, hard plastic, hard alloy, etc.

[0015] The motor 5 is fixedly arranged at the center position of the bottom surface of the shell 1. Specifically, the straight line on which the motor's shaft is located coincides with the straight line on which the central axis of the cylindrical shell 1 is located. The shaft of the motor 5 faces the side of the grid baffle 6. After the motor 5 is powered on, it can rotate at a certain speed. The rotating table 4 is fixedly arranged on the side of the electrode 5 close to the grid baffle 6. Specifically, the rotating table 4 is in the shape of a cylinder. The bottom surface shape of the cylinder is the same as the shape of the cross section of the transparent hollow rotating shaft 21 perpendicular to the rotating shaft direction, and the size is slightly smaller than the size of the cross section, so that the transparent hollow rotating shaft 21 can be fixedly connected to its side. The height of the rotating table 4 cylinder is greater than or equal to the length of the exposed part of the motor 5 shaft, and it contacts the shaft of the motor 5 and the surface of the motor 5 away from the bottom surface of the shell 1. They are fixedly connected and do not produce relative rotation. In this way, when the motor 5 rotates, the rotating table 4 rotates, and when the rotating table 4 rotates, the transparent hollow rotating shaft 21 rotates. The central axis of the transparent hollow shaft 21, the central axis of the rotating table 4, and the straight line on which the rotating shaft of the motor 5 is located are all collinear, so that the angular momentum has no component on the plane perpendicular to the central axis during rotation, and the rotation process is more stable. Activated carbon filter cotton is provided on the inner side of the air inlet 11 for preliminary removal of particulate pollutants and harmful gas pollutants in the air. Specifically, the activated carbon filter cotton is bonded and fixedly connected to the inner side of the air inlet 11 around one circumference to prevent the activated carbon filter cotton from moving inside the air purifier. Activated carbon cotton is provided in the protrusion on the outer shell 1, that is, the activated carbon cotton is not provided inside the outer shell 1 near the rotating table 4 and the motor 5. The activated carbon cotton is fixedly connected to the inner wall of the air inlet 11 to prevent movement.

[0016] The rotating part 2 includes a transparent hollow rotating shaft 21 and rotating fan blades 22. A light source is fixedly provided on the inner wall of the transparent hollow rotating shaft 21. The light source can be a cylindrical light source, preferably, with a size slightly smaller than the inner diameter of the transparent hollow rotating shaft 21, and the four sides of both ends are bonded and fixedly connected to the inner wall of the transparent hollow rotating shaft 21; the light source can also be an LED light source fixedly arranged in a spiral. Specifically, the pitch of the spiral needs to be less than 0.5 cm to ensure that the transparent hollow rotating shaft 21 is irradiated with strong light all around. The length of the light source on the inner wall is equal to the distance between the farthest ends of the fan blade groups at both ends on the outer wall, so that all the fan blades can be illuminated by the light source. The light source can be an ultraviolet light source or an ultraviolet-visible light source.

[0017] The two side surfaces of rotating blade 22 and fixed blade 3 are all fixedly provided with photocatalyst, specifically, photocatalyst is nano-sized titanium dioxide, under the action of light, reacts with oxygen, water molecules, organic pollutants in the air, and finally generates non-toxic carbon dioxide and water, reaches the purpose of purifying air. Specifically, photocatalyst can be fixedly arranged on the surface of blade in the form of deposition, spin coating, spraying, etc., because photocatalyst is nano-sized, and blade surface is rough, photocatalyst particles can be directly deposited on blade surface, or photocatalyst particles can be spin coated or sprayed on blade surface after mixing with adhesive. During work, rotating blade 22 is motion, that is, photocatalyst follows rotating blade 22 motion, like this, the air mobility in air purifier is better, that is, the air around blade is replaced, so there will not be the reduction of water molecules and oxygen concentration in catalytic reaction process, therefore, purification efficiency will not be decreased, thereby improving purification effect.

[0018] Three groups of fan blades are fixedly provided on the outer wall of the transparent hollow rotating shaft 21, which are respectively arranged on the outer wall of the transparent hollow rotating shaft 21 near one end of the grid baffle 6, one end near the rotating table 4, and the middle position. Specifically, the lowest position of the fan blade group near one end of the rotating table 4 needs to be higher than the upper edge of the air inlet 11, and at the same time, the end of the corresponding light source on the inner wall is also higher than the upper edge of the air inlet 11. This will prevent the light from the light source from leaking through the air inlet 11, and will not cause a large amount of light to be irradiated on the activated carbon cotton, thereby improving the utilization rate of the light source. The fan blade groups near one end of the rotating table 4 and the one end near the grid baffle 6 are of the same length, and their edges are close to the inner wall of the shell 1, that is, they are as long as possible inside the shell 1, and the rotation directions of the fan blade groups near one end of the rotating table 4 and the one end near the grid baffle 6 are opposite, and the rotation direction of the fan blade group in the middle position is the same as the rotation direction of the fan blade group near one end of the rotating table 4. In this way, the movement direction of the air when passing through the fan blade group near one end of the rotating table 4 and the fan blade group in the middle position is opposite to the movement direction when passing through the fan blade group near one end of the grid baffle 6, so that the air flowing out directly through the fan blade group near one end of the grid baffle 6 is less, so that most of the air enters the air purifier again and is purified again. The air discharged each time it passes through the fan blade group near one end of the grid baffle 6 is less than the volume of air entering the air purifier again. The air can be purified repeatedly inside the air purifier, increasing the time of the catalytic reaction. Since the air has strong fluidity, the longer air purification time will not reduce the oxygen and water molecules required for the catalytic reaction in the air too much, thereby not reducing the purification efficiency, so as to improve the purification effect.

[0019] At the same time, the length of the fan blade group in the middle position is smaller than the length of the fan blade group near one end of the rotating table 4, which makes it easier to localize the air near the fan blade group in the middle position for catalytic reaction, thereby increasing the time of the catalytic reaction. Since the air has strong fluidity, the longer air purification time will not reduce the oxygen and water molecules required for the catalytic reaction in the air too much, thereby not reducing the purification efficiency, thereby improving the purification effect. On the inner wall of shell 1, fixed blade 3 is fixedly arranged, and fixed blade 3 has two groups of blades, is respectively arranged between the blade group near one end of grid baffle 6 and the middle position blade group in rotating blade 22, and between the blade group near one end of rotating platform 4 and the middle position blade group, the edge of blade is close to transparent hollow rotating shaft 21 but does not touch, does not touch each other when rotating; Like this, on the one hand can be provided with more photocatalyst inside shell 1, makes the action area of photocatalyst and air larger, on the other hand, the setting of fixed blade 3 increases wind resistance, makes the flow rate of air reduce, thereby increases the time of interaction between air and photocatalyst, because the mobility of air is strong, air purification time is long and will not make the oxygen and water molecules needed for catalytic reaction in air reduce too much, thereby will not reduce purification efficiency, to promote purification effect. The distance between blade group from middle position blade group near one end of rotating platform 4 and near grid baffle 6 can be the same, also can be different, the distance between can allow fixed blade 3 on the inner wall of shell 1 and rotating blade 22 not to contact. The transparent hollow shaft 21 is made of plastic or glass, and the rotating blades 22 and the fixed blades 3 are made of plastic or glass fiber. Preferably, the rotating blades 22 and the fixed blades 3 are made of glass fiber. The uneven surface of the glass fiber makes it easier to set the photocatalyst on its surface, and the photocatalyst set on its surface is not easy to fall off. The rotation direction of the fixed blade 3 is opposite to the rotation direction of the corresponding rotating blade 22, that is, the rotation direction of the blade group near the bottom end of the shell 1 is the same as the rotation direction of the blade group near the turntable 4 end, and the rotation direction of the blade group away from the bottom end of the shell 1 is the same as the rotation direction of the blade group in the middle position, which further increases the wind resistance of the air inside the air purifier, prolongs the action time of the air and the catalyst, thereby making the catalytic reaction more sufficient and improving the purification effect. Preferably, the number of groups of fixed fan blades 3 is greater than 2, the number of groups of rotating fan blades 22 is greater than 3, and the number of groups of added fixed fan blades 3 is the same as the number of groups of rotating fan blades 22, and the rotation directions of the two are opposite. All the fan blades do not contact each other during rotation; in this way, on the one hand, the wind resistance inside the air purifier of the present application is greater, and the air stays in the air purifier for a longer time, that is, the time for the air to interact with the photocatalyst is longer, and the number of catalytic reactions is greater. On the other hand, the surface area of the fan blades is larger, and more photocatalysts can be set, so that more air can react with the photocatalyst at the same time. Therefore, the catalytic reaction between the air and the photocatalyst is more sufficient and the purification efficiency is higher.

[0020] The two electrodes of the motor 5 are connected to the power supply through a wire, and the light source is also connected to the power supply. Specifically, the motor 5 and the light source can be in a parallel relationship or in a series relationship. At the same time, a switch is set in the electrical circuit to control the on and off of the circuit. When the electrical circuit is connected, the rotating part 2 rotates, the light source emits light, and the light emitted by the light source shines on the rotating blades 22 and the fixed blades 3. The rotation of the rotating blades 22 causes the air to be purified to enter the air purifier of the present application through the air inlet 11. When it reaches the photocatalyst, a photocatalytic reaction occurs, and the air purifier starts to work. When the electrical circuit is disconnected, the light source stops emitting light, the rotating part 2 stops rotating, the photocatalytic reaction stops, and the air purifier stops working.

[0021] When in use, the electrical circuit is connected, the light emitted by the light source is irradiated on the photocatalyst on the surface of the fan blade, and the rotating part 2 rotates around the central axis of the transparent hollow shaft 21. The air to be purified enters the air purifier of the present application from the air inlet 11, and is primary purified by the activated carbon filter cotton to remove particulate pollutants. The air after primary purification reaches the photocatalyst, produces a photocatalytic reaction, and further removes organic pollutants in the air, achieving the purpose of purifying the air. The purified air is finally discharged by the grid baffle 6. Specifically, when in use, the speed of the motor 5 is less than 500rpm, which makes the contact time between the photocatalyst and the air longer, the photocatalytic reaction is fully carried out, and the purification efficiency is improved. A fixed fan blade 3 with a rotation direction opposite to that of the corresponding rotating fan blade 22 is set on the inner wall of the shell 1 to increase the wind resistance in the air purifier. The increase in wind resistance slows down the flow rate of the air, increases the interaction time between the air and the photocatalyst, and makes the photocatalytic reaction proceed more fully, ultimately improving the air purification efficiency. The blade length of the blade group at the middle position of the rotating blade 22 is less than the blade length of the blade group at the two end positions near the grid baffle 6 and near the turntable 4, and the rotation direction of the blade group near the grid baffle 6 is opposite to the rotation direction of the blade group at the middle position and near the turntable 4; In this way, most of the air at the blade group near the grid baffle 6 will return to the inside of the air purifier to participate in the photocatalytic reaction. By localizing the air in the air purifier, the interaction time between the air and the photocatalyst is increased, that is, the number of photocatalytic reactions before the air is discharged is increased, thereby improving the purification efficiency. When the air purifier of the present application is working, the air mobility is strong, which provides a continuous supply of reactants required for the photocatalytic reaction, such as oxygen and water molecules, which will not cause the photocatalytic reaction to proceed in reverse, resulting in a reduction in purification efficiency, thereby affecting the purification effect of the photocatalytic reaction. Therefore, the purification efficiency of the air purifier of the present application is high, and the purification efficiency is stable.

[0022] Example 2

[0023] On the basis of Example 1, the light source is an ultraviolet-visible light source, and graphene is doped in the photocatalyst. Graphene is transparent and has good absorption characteristics. Due to its zero bandgap structure, graphene has good electrical conductivity. Doping graphene in the photocatalyst has three improvements at the same time. First, it generates doping energy levels so that visible light irradiating the photocatalyst can also generate photogenerated electrons and photogenerated holes. Specifically, the photocatalyst is a semiconductor material with a wide bandgap. The photocatalytic reaction needs to generate photogenerated electrons and photogenerated holes, that is, the energy of the photon needs to be greater than or equal to the bandgap energy of the photocatalyst. Therefore, the existing photocatalyst has good absorption only in the ultraviolet band, that is, it can generate photogenerated electrons and photogenerated holes under ultraviolet light irradiation with higher photon energy; and it cannot generate photogenerated electrons and photogenerated holes under visible light irradiation with lower photon energy. However, the frequency band of visible light is wide, which makes the air purifier's utilization rate of the light source not high. After doping graphene, a metastable doping energy level is generated between the band gaps of the photocatalyst, so that photons can first transition from the valence band of the photocatalyst to the doping energy band, and then transition from the doping energy level to the conduction band of the photocatalyst. Therefore, the required photon energy is less than the band gap of the photocatalyst, so that visible light can also excite photogenerated electrons and photogenerated holes. The increase in the concentration of photogenerated electrons and photogenerated holes makes the photocatalytic reaction proceed in the forward direction, so that the photocatalytic reaction is more sufficient, and the purification efficiency of the air purifier of the present application is higher. The second aspect is to prevent the excited photogenerated electrons and photogenerated holes from recombining. Specifically, the doped photocatalyst forms a heterojunction with graphene so that there is electron migration between the photocatalyst and graphene. At the same time, graphene is a zero-bandgap material with good electrical conductivity. The photogenerated electrons and photogenerated holes generated under the action of light on the photocatalyst are in an excited state and are easily recombine, thereby not being able to participate in the photocatalytic process, making the photocatalytic reaction intensity weaker. After forming a heterojunction, the generated photogenerated electrons are quickly transferred to graphene, thereby avoiding the recombination of photogenerated electrons and photogenerated holes, thereby maintaining a certain concentration of photogenerated electrons and photogenerated holes, so that the photocatalytic reaction proceeds forward, and improves purification efficiency. At the same time, due to the interfacial effect, the photocatalytic reaction is stronger at the interface of the photocatalyst and graphene, further improving the reaction intensity of the photocatalytic reaction, and then improving purification efficiency. The third aspect is to enhance the adsorption of air. Specifically, the electron concentration in graphene is higher, so that the electric field around the graphene is stronger. Under the action of the strong electric field, air is adsorbed near the graphene, so that more air participates in the photocatalytic process, prompting the photocatalytic reaction to proceed forward, thereby making the interaction between air and photocatalyst more sufficient, the air purification efficiency of the air purifier of the present application is higher, and the air purification effect is improved. Combining the above three aspects, doping graphene in photocatalyst can make the photocatalytic reaction more complete, thereby improving the air purification efficiency.

[0024] Example 3

[0025] On the basis of Example 2, doped graphene is wrapped around photocatalyst particles, that is, titanium dioxide particles are wrapped with graphene, and can be prepared using a hydrothermal method. Specifically, the surface area of graphene is larger, and the electric field range generated near it is larger, and more air can be adsorbed to participate in photocatalytic reaction, so that the interaction between air and photocatalyst is more sufficient, thereby improving air purification efficiency. Due to the fact that graphene wraps photocatalyst, the light localized in the graphene wrapping layer is difficult to emit, and multiple reflections are carried out in the graphene wrapping layer, i.e., photocatalyst is excited multiple times, so that it produces more photogenerated electrons and photogenerated holes, so that the photocatalytic reaction is forward, thereby improving purification efficiency. In addition, the outer layers of different photocatalyst particles are all wrapped with graphene, and the electrical conductivity of graphene is relatively large. In this way, the graphene wrapping layers outside adjacent photocatalyst particles are in contact with each other, so that the photogenerated electrons migrating from the graphene can migrate over the entire fan blade area, thereby being able to undergo photocatalytic reactions with the air in a larger spatial range, thereby producing more oxygen negative ions and hydroxyl free radicals, reacting with more organic pollutants to generate carbon dioxide and water, thereby purifying the air. Therefore, the air purifier of the present application has a high purification efficiency.

[0026] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A photocatalytic air purifier, characterized in that: The invention comprises a shell, an air inlet, a fixed fan blade, a rotating fan blade, a transparent hollow rotating shaft, a light source, a photocatalyst, a motor, and a rotating table. The shell is a hollow open cylindrical shape. The air inlet is arranged on the side of the shell away from the open end. The fixed fan blade is fixedly arranged on the inner wall of the side of the shell. The motor is fixedly arranged on the inner wall of the bottom surface of the shell. The rotating table is fixedly arranged on the side of the motor close to the open end of the shell. The transparent hollow rotating shaft is fixedly arranged on the rotating table. The rotating fan blade is fixedly arranged on the outer side of the transparent hollow rotating shaft. There is no contact between the fixed fan blade and the rotating fan blade. The photocatalyst is fixedly arranged between the fixed fan blade and the rotating fan blade. The surface of the rotating fan blades, the material of the transparent hollow rotating shaft is transparent material, the cross-sectional shape of the transparent hollow rotating shaft in the direction perpendicular to the central axis is annular, the light source is fixedly arranged inside the transparent hollow rotating shaft through the inner wall of the transparent hollow rotating shaft, and the motor and the light source are connected to a power supply; the rotating fan blades and the fixed fan blades are staggered in the direction of the transparent hollow rotating shaft, the rotation direction of the fan blade group of the rotating fan blade away from one end of the bottom of the outer shell is different from the rotation direction of the remaining rotating fan blade groups, and the rotation direction of the fixed fan blade is opposite to the rotation direction of the corresponding rotating fan blade; the material of the fixed fan blade and the rotating fan blade is glass fiber.

2. The photocatalytic air purifier according to claim 1, wherein: The straight line where the rotating shaft of the motor is located, the central axis of the rotating platform, the central axis of the transparent hollow rotating shaft, and the central axis of the housing are all collinear.

3. The photocatalytic air purifier according to claim 2, wherein: The photocatalyst is nano-sized titanium dioxide.

4. The photocatalytic air purifier according to claim 3, wherein: The number of groups of the fixed fan blades is greater than or equal to two, and the plane where the contact points of each group of the fixed fan blades and the housing are located is perpendicular to the central axis of the housing.

5. The photocatalytic air purifier according to claim 4, characterized in that: The plane where the contact points of each group of rotating blades and the transparent hollow rotating shaft are located is perpendicular to the central axis of the transparent hollow rotating shaft.

6. The photocatalytic air purifier according to claim 5, characterized in that: The rotating platform is cylindrical in shape.

7. The photocatalytic air purifier according to claim 6, characterized in that: The inner wall of one end of the transparent hollow rotating shaft is bonded and fixedly connected to the side surface of the rotating platform.

8. The photocatalytic air purifier according to claim 1, wherein: A grid baffle is provided at one open end of the shell, and the grid baffle is detachably connected to the shell.

9. The photocatalytic air purifier according to claim 1, wherein: Activated carbon filter cotton is fixedly arranged on the inner side of the air inlet.

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