Air purifier

Abstract

According to the air purifier, air turbulence can be formed in the filter cartridge, the point wind speed on the surface of a photocatalyst carrier is increased due to the formation of the air turbulence, the contact probability of air and the photocatalyst carrier can be increased, and the filtering effect of the filter cartridge is improved; furthermore, no shielding object is arranged in the air duct in the filter cartridge, and the air resistance in the filter cartridge is reduced, so that the filtering effect of the air purifier can be comprehensively improved in the two aspects of purified air quantity and purification effect, the air resistance in a filtering pipeline is reduced, the contact frequency of air and the photocatalyst carrier is increased, and the air purification effect is improved. And the filtering efficiency of the air purifier is improved. The filter cartridge is provided with an air inlet and an air outlet, and the axial length of the filter cartridge is larger than the maximum inner diameter of the filter cartridge; the photocatalyst carrier is attached to the inner surface of the filter cartridge; and the irradiation unit is fixed on the inner surface of the filter cartridge and emits ultraviolet light to irradiate the photocatalyst carrier.

Description

Technical Field

[0001] The utility model relates to the technical field of air purification, and more specifically to an air purifier. Background Art

[0002] An air purifier is a device that purifies the air by means of physical adsorption and / or chemical decomposition. Existing air purifiers mainly use activated carbon adsorption, chemical material decomposition or photocatalyst decomposition as purification methods. Among them, activated carbon adsorption as a single physical adsorption method cannot decompose harmful gases in the air, and the purification and filtration effect is limited; chemical material decomposition can use chemical reactions to decompose specific harmful substances. The types and capabilities of substances that can be decomposed are limited by materials, etc., and it is difficult to maintain long-term effective filtration and purification effects; while photocatalyst decomposition can irradiate a photocatalyst carrier with light of a special frequency, induce the electrons of the photocatalyst material in the photocatalyst carrier to jump out, and decompose the water molecules in the air around the photocatalyst carrier, and use the hydroxide ions obtained by the decomposition of water molecules to decompose the pollutants contained in the air, which can maintain long-term reaction activity and have a better long-term air purification effect. However, since the substances decomposed by the photocatalyst material are often concentrated around the photocatalyst carrier, effective purification can be achieved through air circulation or contact with the surface of the photocatalyst carrier.

[0003] In this regard, the prior art often uses a filtration structure that combines a photocatalyst carrier with a filter, so that the air in the pipe passes through the filter and comes into contact with the photocatalyst material in the photocatalyst carrier to decompose, thereby purifying the air. However, the purification effect is poor when the air flows through the filter at one time. In order to improve the purification effect, or for some filtering pipes with a larger air volume, the filtration structure combining the photocatalyst carrier with the filter needs to be provided with multiple layers, which increases the wind resistance in the pipe and makes the wind pressure in the pipe upstream of the filter too large.

[0004] In the prior art, as described in patent document JP2022074291A, a technical solution is provided in which a photocatalyst nonwoven fabric and an irradiation unit are arranged on the inner peripheral surface of the air outlet pipe. Figure 1 As shown, the photocatalyst nonwoven fabric 36 and the LED 38 of the irradiation unit for irradiating the photocatalyst nonwoven fabric 36 with ultraviolet rays are arranged on the inner peripheral surface of the air outlet duct body 20 at the rear side of the vehicle. The photocatalyst nonwoven fabric 36 is a nonwoven fabric carrying a photocatalyst such as titanium dioxide. When the LED 38 irradiates ultraviolet rays to the photocatalyst nonwoven fabric 36, OH radicals are generated on the surface of the nonwoven fabric, and the generated OH radicals can remove odor components, smoke components, etc. contained in the air. Thus, the air flowing through the air duct 35 in the vehicle air conditioner 10 is purified.

[0005] In the prior art, the photocatalyst nonwoven fabric is attached to the inner surface of the air duct, which reduces wind resistance and is easy to replace. However, the prior art has a technical problem of how to effectively control the flow of gas in the air duct to achieve a better air purification effect.

[0006] Therefore, an improved technical solution is urgently needed to solve the above problems of the existing air purifier. Utility Model Content

[0007] In view of the above-mentioned problems in the prior art, the technical solution of the utility model provides an air purifier, which can reduce the wind resistance in the filter duct, increase the contact between air and photocatalyst carrier, and improve the purification efficiency of the air purifier.

[0008] The utility model provides an air purifier, which at least comprises: a filter cartridge with an air inlet and an air outlet, wherein the axial length of the filter cartridge is greater than the maximum inner diameter of the filter cartridge; a photocatalyst carrier attached to the inner surface of the filter cartridge; and an irradiation unit fixed to the inner surface of the filter cartridge, emitting ultraviolet light to irradiate the photocatalyst carrier.

[0009] According to the technical solution, the photocatalyst carrier attached to the wall of the filter cartridge has a rough surface due to the particle characteristics of the photocatalyst material. Therefore, after the high-speed flowing air enters the filter cartridge, it contacts the photocatalyst carrier on the inner surface of the filter cartridge, and the disturbance of the rough surface of the photocatalyst carrier will form an irregularly moving turbulent flow. Since the axial length of the filter cartridge is larger than the maximum inner diameter of the filter cartridge, the fine turbulent flow can develop into turbulence in the filter cartridge with a larger axial length, and the formation of air turbulence increases the point wind speed on the surface of the photocatalyst carrier, so that mixing occurs between the layers of air flow, thereby improving the contact between the air and the photocatalyst carrier, that is, improving the purification effect of the air flowing through the filter cartridge. At the same time, since the photocatalyst carrier and the irradiation unit are both arranged on the inner surface of the filter cartridge, there is no obstruction such as a filter screen in the air duct inside the filter cartridge, and the wind resistance in the filter cartridge is also reduced, so that the purification efficiency of the air purifier can be comprehensively improved in terms of purification air volume and purification effect.

[0010] As a preferred technical solution, the air purifier provided by the utility model may further include: a fan arranged outside the filter cartridge and correspondingly arranged at the air outlet.

[0011] According to this preferred technical solution, the fan is arranged outside the filter cartridge and air is sucked to the outside through the air outlet, which can avoid the fan being arranged inside the filter cartridge from blocking the air flow inside the filter cartridge.

[0012] As a preferred technical solution, the photocatalyst carrier of the air purifier provided by the utility model is a photocatalyst non-woven fabric, and the photocatalyst non-woven fabric is attached to the inner surface of the filter cartridge.

[0013] According to the preferred technical solution, the photocatalyst non-woven fabric has a rough surface, which is more conducive to the formation of air turbulence in the filter cartridge. In addition, the photocatalyst non-woven fabric has good flexibility and can be more closely attached to the inner surface of the filter cartridge, thereby increasing the contact area between the air and the photocatalyst non-woven fabric.

[0014] As a preferred technical solution, the irradiation unit of the air purifier provided by the utility model includes irradiation lamp beads, and the surface of the photocatalyst non-woven fabric is provided with a notch matching the size of the irradiation lamp beads, and the irradiation lamp beads are arranged on the inner surface of the filter cartridge in the form of being fully or partially embedded in the notch.

[0015] According to the preferred technical solution, a notch is opened on the surface of the photocatalyst non-woven fabric, so that the irradiation light emitted by the irradiation lamp beads can be emitted from the notch to the surroundings, thereby expanding the irradiation range of the ultraviolet rays emitted by the irradiation lamp beads. In addition, the irradiation lamp beads are arranged in a manner of being embedded in the notch, which will not affect the airflow in the filter cartridge and can further reduce the wind resistance in the filter cartridge.

[0016] As a preferred technical solution, the inner surface of the filter cartridge of the air purifier provided by the utility model has the same cross-section in the axial direction, and the irradiation units are evenly distributed on the inner surface of the filter cartridge along the axial direction of the filter cartridge.

[0017] According to the preferred technical solution, the irradiation unit can optimize the irradiation of the photocatalyst non-woven fabric on the inner surface of the filter cartridge, and can also ensure optimized ultraviolet irradiation of the photocatalyst non-woven fabric while saving costs by reasonably setting the axial distribution spacing of the irradiation unit on the inner surface of the filter cartridge.

[0018] As a preferred technical solution, the cross-section of the inner surface of the filter cartridge of the air purifier provided by the utility model is rectangular.

[0019] According to the preferred technical solution, the rectangular filter cartridge has four flat inner surfaces, which makes it easier to attach and replace the photocatalyst carrier.

[0020] As a preferred technical solution, the filter cartridge of the air purifier provided by the utility model is a metal shell.

[0021] According to the preferred technical solution, the metal material has good heat transfer performance and can promptly absorb and dissipate the heat generated by the irradiation unit, which is beneficial to extending the life of the irradiation unit. In addition, the metal material will not be decomposed by the photocatalyst material. The filter cartridge made of metal material can resist the decomposition and corrosion of the photocatalyst material and has a higher shell hardness.

[0022] As a preferred technical solution, the air purifier provided by the utility model may also include: a conical guide cylinder having a guide cylinder inlet and a guide cylinder outlet, which is arranged in a form of matching connection between the guide cylinder inlet and the air outlet of the filter cylinder, and the cross-sectional area of ​​the guide cylinder outlet is larger than the cross-sectional area of ​​the guide cylinder inlet.

[0023] According to the preferred technical solution, the guide cylinder outlet with a larger cross-sectional area can increase the matching surface between the conical guide cylinder and the fan, so that the air outlet of the filter cylinder has a lower air pressure, increasing the wind speed in the filter cylinder, and being more conducive to the formation of air turbulence. After the air with a higher flow rate in the filter cylinder enters the conical guide cylinder, as the cross-sectional area of ​​the conical guide cylinder increases, the flow rate of the air decreases, so that the filtered air can be blown out smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of an air purifier in the prior art.

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of the air purifier in the first embodiment of the utility model.

[0026] Figure 3 It is a schematic cross-sectional view of the air purifier in the first embodiment of the present utility model.

[0027] Figure 4 It is a schematic cross-sectional structure diagram of the air purifier in the second embodiment of the present utility model.

[0028] Figure 5 It is a schematic cross-sectional structure diagram of a preferred air purifier in the second embodiment of the present utility model.

[0029] Figure 6 It is a schematic cross-sectional structure diagram of an air purifier provided in the third embodiment of the present utility model.

[0030] Figure 7 It is a schematic structural diagram of a cross section of an air purifier provided in the third embodiment of the present utility model.

[0031] Figure numerals: 1-filter cylinder; 11-air inlet; 12-air outlet; 2-photocatalyst carrier; 20-photocatalyst non-woven fabric; 21-notch; 3-irradiation unit; 31-irradiation lamp bead; 32-irradiation lamp holder; 4-fan; 5-conical guide cylinder; 51-guide cylinder outlet; 52-guide cylinder inlet. DETAILED DESCRIPTION

[0032] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0033] The term "photocatalyst carrier" refers to a composite carrier formed by combining a photocatalyst material and a carrier that carries the photocatalyst material, wherein the photocatalyst material can be solid particles of one or more combinations of titanium dioxide (TiO2), zinc oxide (ZnO), tin oxide (SnO2), zirconium dioxide (ZrO2), cadmium sulfide (CdS), etc., and the carrier can be a ceramic carrier, a non-woven fabric carrier, an activated carbon carrier, etc. The photocatalyst material can be compounded in the carrier by deposition / coating / impregnation, etc. to obtain the photocatalyst carrier in this embodiment.

[0034] The term "turbulence" refers to a flow state of a fluid. Fluid flow is generally divided into "laminar flow" and "turbulent flow". The determining factors for the transition between the two include flow velocity, the aspect ratio of the pipe, and the roughness of the inner surface of the pipe. Among them, the greater the flow velocity, the greater the aspect ratio of the pipe, and the higher the roughness of the inner surface of the pipe, the greater the difference between the flow velocity in the center of the fluid and the flow velocity near the inner surface of the pipe, and the streamlines of the fluid begin to swing in a wave-like manner until the laminar flow is destroyed and turbulence is formed. Turbulent fluids do not have clear hierarchical interfaces during the flow process. The fluid moves irregularly and there is mixing between adjacent flow layers.

[0035] First embodiment

[0036] Figure 2 is a schematic diagram of an axial cross-sectional structure of an air purifier provided in the first embodiment of the utility model, Figure 3 1 is a cross-sectional schematic diagram of an air purifier provided by the first embodiment of the utility model. Figure 2 and Figure 3 As shown in FIG. 1 , the air purifier includes a filter cartridge 1 , a photocatalyst carrier 2 and an irradiation unit 3 .

[0037] The filter cartridge 1 may be a hollow cylinder with any shape and material, having an air inlet 11 and an air outlet 12, and is not limited here. For example, the filter cartridge 1 may be a cylinder with a triangular, rectangular, pentagonal, hexagonal, circular or elliptical cross section on the inner surface, or may be a conical or truncated cone cylinder with an uneven inner diameter. Figure 3 The structure of a preferred filter cartridge 1 is shown in the figure, that is, the cross section of the inner surface of the filter cartridge 1 is rectangular. The rectangular filter cartridge 1 has four flat inner surfaces, which can make it easier to attach or remove and replace the photocatalyst carrier 2. The two axial ends of the filter cartridge 1 are relatively connected to form an air duct for air flow. The through openings at the two ends of the air duct are respectively an air inlet 11 ( Figure 2 The opening at the right end of the filter cartridge 1) and the air outlet 12 ( Figure 2The air enters the filter cartridge 1 through the air inlet 11 on the right side of the filter cartridge 1 for purification, and the purified air is blown out of the filter cartridge 1 through the air outlet 12 on the left side of the filter cartridge 1. In particular, in this embodiment, the axial length L of the filter cartridge 1 is greater than the maximum inner diameter D of the filter cartridge 1.

[0038] The inner surface of the filter cartridge 1 is fixed with a photocatalyst carrier 2 and an irradiation unit 3, wherein the irradiation unit 3 can be embedded in the inner surface of the filter cartridge 1, or can be fixed to the inner surface of the filter cartridge 1 in a protruding manner, and the irradiation unit 3 includes an irradiation lamp bead that can emit light of a specific frequency (see Figure 7 ), the light of the specific frequency matches the type of photocatalyst material in the photocatalyst carrier 2, and the light of the specific frequency can be used to irradiate the photocatalyst material and make the photocatalyst material decompose water molecules in the air. Specifically, in this embodiment, the irradiation unit 3 has a UVLED capable of emitting ultraviolet rays as an example. The photocatalyst carrier 2 is attached to the inner surface of the filter cartridge 1 and is arranged in a manner that does not block the irradiation unit 3, so that the irradiation unit 3 can emit ultraviolet rays to irradiate the surface of the photocatalyst carrier 2.

[0039] Specifically, when the air purifier provided in the present embodiment performs air purification, the irradiation unit 3 is first turned on to emit ultraviolet rays. After the photocatalyst carrier 2 attached to the inner surface of the filter cartridge 1 is irradiated with ultraviolet rays, the photocatalyst material in the photocatalyst carrier 2 is activated, and the water molecules in the air are continuously decomposed, and purified ions (hydroxyl ions) are formed near the surface of the photocatalyst carrier 2 to decompose the pollutants contained in the air. At this time, air is blown into the filter cartridge 1, and the air first enters the filter cartridge 1 from the air inlet 11 of the filter cartridge 1, and then continues to flow along the axial direction of the filter cartridge 1. At this time, since the axial length L of the filter cartridge 1 used in the present embodiment is larger than the maximum inner diameter D of the filter cartridge 1, and the photocatalyst carrier 2 attached to the inner surface of the filter cartridge 1 also has a rougher surface due to the particle characteristics of the photocatalyst material, the flowing air enters the filter cartridge 1 and contacts with the photocatalyst carrier 2 on the inner surface of the filter cartridge 1, and is disturbed by the rough surface of the photocatalyst carrier 2 to form The irregular motion of the disturbed flow will develop into turbulence in the filter cartridge 1 whose axial length L is greater than the maximum inner diameter D (i.e., the aspect ratio is greater than 1). The formation of air turbulence makes it easier for the air flowing in the filter cartridge 1 to mix. Therefore, not only the air near the photocatalyst carrier 2 on the inner surface of the filter cartridge 1 is purified, but also the air farther away from the photocatalyst carrier 2 (i.e., closer to the center of the filter cartridge 1) can have the opportunity to mix and flow to the vicinity of the photocatalyst carrier 2, so that the water molecules therein are decomposed to obtain purified ions (hydroxyl ions).

[0040] The air flows through the filter cartridge 1 , and after being purified as described above, is blown out from the air outlet 12 of the filter cartridge 1 .

[0041] It is worth mentioning that the inventors tested the effects of filter cartridges 1 with different aspect ratios on the filtering effect of the air purifier, and the test results are shown in Table 1. When the inner diameter D of the filter cartridge 1 is 30 mm and the axial length L is 100 mm, the CADR value of the air purifier is 0.5 mm. 3 / h; when the inner diameter D of the filter cartridge 1 is 30 mm and the axial length L is 200 mm, the CADR value of the air purifier is 0.7 m 3 / h; when the inner diameter D of the filter cartridge 1 is 50 mm and the axial length L is 100 mm, the CADR value of the air purifier is 0.7 m 3 / h; when the inner diameter D of the filter cartridge 1 is 50 mm and the axial length L is 200 mm, the CADR value of the air purifier is 1m 3 / h. It can be seen that when the inner diameter D of the filter cartridge 1 is 50 mm and the axial length L is 200 mm, the filtering effect of the air purifier is better.

[0042] Table 1. Filtration test table of air purifiers with different aspect ratios

[0043]

[0044] Furthermore, the inventors also conducted UVLED power selection and air volume tests for air purifiers with a filter cartridge size of 50 mm x 200 mm. The test results are shown in Table 2. When the air volume is 625.7 L / min-809.3 L / min and 4-8 W / 4 pcs UVLED is used as the irradiation unit 3, the CADR value of the air purifier can be greater than 3 m 3 / h, the filtration effect is excellent. In particular, when the air volume is 625.7L / min and 6W / 4pcs UVLED is used as the irradiation unit 3, the CADR value of the air purifier reaches a maximum value of 5.681m 3 / h, the filtering effect is best.

[0045] Table 2. Filtration test table of air purifiers at different air volumes and LED powers

[0046] Test conditions <![CDATA[CADR value / m 3 / h]]> 401.8L / min, 2W / 4pcsUVLED 2.716 625.7L / min, 2W / 4pcsUVLED 2.875 625.7L / min, 4W / 4pcsUVLED 3.674 625.7L / min, 6W / 4pcsUVLED 5.681 809.3L / min, 6W / 4pcsUVLED 4.577 809.3L / min, 8W / 4pcsUVLED 3.959

[0047] In the present embodiment, the ratio of the axial length L of the filter cartridge 1 to the maximum inner diameter D is increased, and the photocatalyst carrier 2 is attached to the filter cartridge 1 to form a rough surface, so that the air flowing into the filter cartridge 1 forms air turbulence. The formation of air turbulence increases the point wind speed on the surface of the photocatalyst carrier 2, so that mixing occurs between the layers of air flow, thereby increasing the contact between the air and the photocatalyst carrier 2, that is, improving the purification effect of the air flowing through the filter cartridge 1; at the same time, since the photocatalyst carrier 2 and the irradiation unit 3 are both fixed to the inner surface of the filter cartridge 1, there are no obstructions in the air duct inside the filter cartridge 1, and the wind resistance in the air duct of the filter cartridge 1 is reduced, thereby comprehensively improving the purification efficiency of the air purifier in terms of both purified air volume and purification effect.

[0048] Second embodiment

[0049] The second embodiment of the present invention is a more preferred technical solution based on the air purifier in the first embodiment, and is described in detail with examples.

[0050] Figure 4 Schematic diagram of the cross-sectional structure of the air purifier in the second embodiment of the utility model. Figure 4 As shown, the air purifier in this embodiment may further include a fan 4, which may be a blower or a suction fan. According to different blowing methods, the fan 4 may be correspondingly arranged at the air inlet 11 or the air outlet 12 of the filter cartridge 1. For example, when the fan 4 is a blower, the fan 4 is correspondingly arranged at the air inlet 11 of the filter cartridge 1, and blows air from the air inlet 11 into the air duct of the filter cartridge 1; when the fan 4 is a suction fan, the fan 4 is correspondingly arranged at the air outlet 12, and draws air outward from the air outlet 12, so that the air in the air duct of the filter cartridge 1 flows to the air outlet 12.

[0051] Among them, preferably, the fan 4 is a suction fan (centrifugal fan), which draws air outward from the air outlet 12. The suction fan has less noise than the blower, so that the air filter in this embodiment can be more suitable for use in home or office environments.

[0052] Furthermore, if Figure 5 As shown, the air purifier in this embodiment may also have a conical guide cylinder 5 connected to the air inlet 11 or the air outlet 12 of the filter cylinder 1. Figure 5 The example in FIG. 1 shows that the conical guide tube 5 is correspondingly arranged at the air outlet 12, but the present invention is not limited thereto. The conical guide tube 5 is also arranged at the air inlet 11. The conical guide tube 5 also has an axially penetrating guide air duct, with the guide tube outlet 51 and the guide tube inlet 52 at the two ends thereof. Figure 5Take an example to illustrate, when the conical guide cylinder 5 is set at the air outlet 12 of the filter cylinder 1, the guide cylinder inlet 52 of the conical guide cylinder 5 is matched and connected with the air outlet 12 of the filter cylinder 1, and the cross-sectional area of ​​the guide cylinder outlet 51 is larger than the cross-sectional area of ​​the guide cylinder inlet 52. The guide cylinder outlet 51 with a larger cross-sectional area can increase the matching surface between the middle conical guide cylinder 5 and the fan 4, so that the air outlet 12 of the filter cylinder 1 has a lower air pressure, the wind speed in the filter cylinder 1 is increased, and it is beneficial to the formation of air turbulence in the filter cylinder 1. After the air with a higher flow rate in the filter cylinder 1 enters the conical guide cylinder 5, as the cross-sectional area of ​​the conical guide cylinder 5 increases, the flow rate of the air decreases, so that the filtered air can be blown out smoothly, which can improve the user experience.

[0053] It should be noted that the "conical guide tube" in the present embodiment refers to the inner surface of the conical guide tube enclosed to form a conical air duct (i.e., the cross-sectional area of ​​the guide tube outlet 51 is larger than the cross-sectional area of ​​the guide tube inlet 52), and does not imply that the exterior of the conical guide tube is formed into a cone. In fact, no matter what shape the exterior of the conical guide tube is formed into, as long as the air duct enclosed by its inner surface is a cone with a large inlet and a small outlet, it falls within the protection scope of the present utility model.

[0054] Among them, preferably, the filter cylinder 1 and / or the conical guide cylinder 5 can be a metal shell. The metal material has good heat transfer performance and can promptly absorb and dissipate the heat generated by the irradiation unit 3, which is beneficial to prolonging the life of the irradiation unit 3. In addition, the metal material will not be decomposed by the photocatalyst material and has a higher shell hardness.

[0055] In this embodiment, by arranging a fan 4 outside the filter cartridge 1 and arranging a conical guide cylinder 5 with a small inlet and a large outlet at the air outlet 12 of the filter cartridge 1 corresponding to the fan 4, it is possible to avoid the fan 4 being arranged inside the air duct of the filter cartridge 1 to block the air flow in the air duct, increase the wind speed inside the filter cartridge 1, and enable the filtered air to be smoothly blown out from the guide cylinder outlet 51 of the conical guide cylinder 5, thereby promoting the formation of air turbulence in the filter cartridge 1 and improving the user experience.

[0056] Third embodiment

[0057] The third embodiment of the present utility model is a more optimized technical solution made on the basis of the air purifier in the first embodiment or the second embodiment, which is described in detail with examples below.

[0058] In the third embodiment of the utility model, the photocatalyst carrier 2 is preferably a photocatalyst non-woven fabric 20 carrying a photocatalyst material. For example, nanoparticles containing one or more combinations of titanium dioxide (TiO2), zinc oxide (ZnO), tin oxide (SnO2), zirconium dioxide (ZrO2), cadmium sulfide (CdS), etc. can be compounded on the surface of the non-woven fabric by a deposition method to form a photocatalyst non-woven fabric 20 with a rough surface. The photocatalyst non-woven fabric 20 has good flexibility and can adhere more closely to the inner surface of the filter cartridge 1. The photocatalyst non-woven fabric 20 can be arranged in a manner that covers the entire inner surface of the filter cartridge 1, thereby being able to increase the contact area between the air and the photocatalyst non-woven fabric 20 to a greater extent.

[0059] Figure 6 : is a schematic cross-sectional view of an air purifier provided in the third embodiment of the present utility model, such as Figure 6 As shown, a notch 21 matching the size of the irradiation unit 3 is formed on the surface of the photocatalyst non-woven fabric 20, and the irradiation unit has an irradiation lamp holder 32 and an irradiation lamp bead 31 (UVLED), wherein the irradiation lamp holder 32 is fixed to the inner surface of the filter cartridge 1 and is arranged corresponding to the notch 21, and the irradiation lamp bead 31 is arranged in a manner of partially or completely embedding in the notch 21, so that the irradiation light emitted by the irradiation lamp bead 31 can be emitted from the notch 21 to the surroundings, thereby expanding the irradiation range of the ultraviolet rays emitted by the irradiation lamp bead 31, and the embedded irradiation lamp bead 31 will not block the air flow in the filter cartridge 1, further reducing the wind resistance inside the filter cartridge 1.

[0060] Preferably, the cross-section of the inner surface of the filter cartridge 1 in the axial direction remains unchanged, the inner surface of the filter cartridge 1 encloses a uniform air duct with a constant inner diameter D, and the irradiation units are evenly distributed on the inner surface of the filter cartridge 1 along the axial direction of the filter cartridge 1, so that the photocatalyst non-woven fabric 20 on the inner surface of the filter cartridge 1 can be optimally irradiated, and by reasonably setting the axial distribution spacing of the irradiation units 3 on the inner surface of the filter cartridge 1, it is possible to ensure uniform ultraviolet irradiation of the photocatalyst non-woven fabric 20 while saving costs.

[0061] Further, Figure 7 : is a schematic diagram of the cross-section structure of an air purifier provided in the third embodiment of the present utility model, such as Figure 7 As shown, for a filter cartridge 1 with a rectangular cross-section on the inner surface, the irradiation units 3 can be symmetrically arranged on the opposite inner side surfaces of the filter cartridge 1, so as to achieve a more optimized irradiation effect and improve the filtration efficiency of the air purifier.

[0062] In this embodiment, a photocatalyst non-woven fabric 20 with a high surface roughness is used as a photocatalyst carrier 2, which can further promote the formation of air turbulence inside the filter cartridge 1; and, by designing and improving the structure and distribution of the irradiation unit 3, the uniformity of ultraviolet irradiation of the irradiation lamp beads 31 on the surface of the photocatalyst non-woven fabric 20 is also improved, and the number and cost of the irradiation units 3 are reasonably controlled.

[0063] So far, the technical solutions of the present invention have been described in conjunction with the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific implementations. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An air purifier, comprising: A filter cartridge having an air inlet and an air outlet; A photocatalyst carrier is attached to the inner surface of the filter cartridge; The irradiation unit is fixed to the inner surface of the filter cartridge and emits ultraviolet light to irradiate the photocatalyst carrier. It is characterized in that The axial length of the filter cartridge is greater than the maximum inner diameter of the filter cartridge.

2. The air purifier according to claim 1, characterized in that: Also includes, The fan is outside the filter cartridge and is correspondingly arranged at the air outlet.

3. The air purifier according to claim 1, characterized in that: The photocatalyst carrier is a photocatalyst non-woven fabric, and the photocatalyst non-woven fabric is attached to the inner surface of the filter cartridge.

4. The air purifier according to claim 3, characterized in that: The irradiation unit comprises irradiation lamp beads, a notch matching the size of the irradiation lamp beads is provided on the surface of the photocatalyst non-woven fabric, and the irradiation lamp beads are arranged on the inner surface of the filter cartridge in the form of being fully or partially embedded in the notch.

5. The air purifier according to any one of claims 1 to 3, characterized in that: The cross sections of the inner surface of the filter cartridge in the axial direction are all the same, and the irradiation units are evenly distributed on the inner surface of the filter cartridge along the axial direction of the filter cartridge.

6. The air purifier according to claim 5, characterized in that: The cross section of the inner surface of the filter cartridge is rectangular.

7. The air purifier according to claim 1, characterized in that: The filter cartridge is a metal shell.

8. The air purifier according to claim 2, characterized in that: Also includes: The conical guide cylinder has a guide cylinder inlet and a guide cylinder outlet, and is arranged in a form in which the guide cylinder inlet is matched and connected with the air outlet of the filter cylinder, and the cross-sectional area of ​​the guide cylinder outlet is larger than the cross-sectional area of ​​the guide cylinder inlet.

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