Formaldehyde filters and air handling units

Abstract

The present invention discloses a formaldehyde filter and an air treatment device, wherein the formaldehyde filter comprises a substrate, the substrate has a plurality of vents extending along the thickness direction of the substrate, the cross-sectional area of ​​the vents and the hole depth of the vents have a cut-to-depth ratio, and the cut-to-depth ratio is greater than or equal to 0.06 and less than or equal to 2.5. In this way, the filtering effect of the formaldehyde filter can be ensured; and the wind resistance of the formaldehyde filter can be avoided to be too large, so as to ensure the air supply volume, thereby ensuring the stability of the performance of the formaldehyde filter.

Description

Technical Field

[0001] The present invention relates to the technical field of air purification, in particular to a formaldehyde filter and an air treatment device. Background Art

[0002] In the related art, formaldehyde filters can be used to remove formaldehyde, but there are no restrictions on the cross-sectional area of ​​the vent holes and the thickness of the formaldehyde filter, which can easily make the wind resistance of the formaldehyde filter too large, or the filtering effect (mainly referring to the formaldehyde removal effect) too poor, thus making the performance of the formaldehyde filter unstable. Summary of the Invention

[0003] The main purpose of the present invention is to provide a formaldehyde filter, aiming to solve the technical problem of unstable performance of formaldehyde filter in related technologies.

[0004] To achieve the above object, the present invention provides a formaldehyde filter, comprising a substrate having a plurality of vent holes extending along the thickness direction of the substrate, wherein the cross-sectional area of ​​the vent holes and the hole depth of the vent holes have a cut-to-depth ratio, and the cut-to-depth ratio is greater than or equal to 0.06 mm / mm. 2 , and less than or equal to 2.5mm / mm 2 .

[0005] Optionally, the cut-to-depth ratio is greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1mm / mm 2 .

[0006] Optionally, the cross-sectional shape of the vent hole is triangular.

[0007] Optionally, the cross-sectional shape of the vent hole is circular, and the cross-sectional depth ratio is greater than or equal to 0.06 mm / mm. 2 , and less than or equal to 1.8mm / mm 2 .

[0008] Optionally, the vent hole has a depth greater than or equal to 3 mm / mm 2 , and less than or equal to 50 mm / mm 2 and / or

[0009] The mesh number of the vent holes is greater than or equal to 30 and less than or equal to 150; and / or

[0010] A depth direction of the vent hole is inclined with respect to a thickness direction of the substrate.

[0011] Optionally, it is characterized in that the formaldehyde filter further includes a catalytic layer, and the catalytic layer is arranged on the surface of the hole wall of the vent hole.

[0012] Optionally, the substrate is made of a paper material; and / or

[0013] The catalyst layer is prepared from materials including at least one of manganese dioxide and titanium dioxide.

[0014] Optionally, a plurality of inner ventilation holes are provided on the hole wall of the ventilation hole, and the inner ventilation holes are connected to two adjacent ventilation holes.

[0015] The present invention also provides an air treatment device comprising a housing and a formaldehyde filter. The housing has an air inlet, an air outlet, and an air treatment duct connecting the air inlet and the air outlet. The formaldehyde filter is disposed at the air inlet; alternatively, the formaldehyde filter is disposed within the air treatment duct; alternatively, the formaldehyde filter is disposed at the air outlet. The formaldehyde filter comprises a substrate having a plurality of vents extending along the thickness of the substrate. The cross-sectional area of ​​the vents and the depth of the vents have a cut-to-depth ratio, and the cut-to-depth ratio is greater than or equal to 0.06 and less than or equal to 2.5.

[0016] Optionally, the air treatment device is any one of a fan, an air machine, an air conditioner indoor unit, an all-in-one air conditioner, an air purifier and an air humidifier.

[0017] The formaldehyde filter of the present invention can ensure the filtering effect of the formaldehyde filter by making the cut-to-depth ratio greater than or equal to 0.06 and less than or equal to 2.5; it can also avoid excessive wind resistance of the formaldehyde filter to ensure the air supply volume, thereby ensuring the stability of the performance of the formaldehyde filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a schematic structural diagram of an air treatment device according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the formaldehyde filter;

[0021] Figure 3 for Figure 2 A partial enlarged view of point A in the middle;

[0022] Figure 4 For formaldehyde filter along Figure 2 Schematic cross-section of line Ⅰ-Ⅰ;

[0023] Figure 5 Schematic diagram of the cross-sectional structure of another embodiment of the formaldehyde filter of the present invention;

[0024] Figure 6 Schematic diagram of the cross-sectional structure of the formaldehyde filter of the present invention in other embodiments.

[0025] Description of Figure Numbers:

[0026] Label name Label name 100 Formaldehyde filter 1000 Air handling unit 10 substrate 200 case 11 vents 220 air outlet

[0027] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that if the embodiments of the present invention include descriptions of "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0030] In addition, the meaning of "and / or" appearing in the full text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution in which both A and B are satisfied.

[0031] The invention provides a formaldehyde filter and an air treatment device.

[0032] The formaldehyde filter is used in air handling units to remove formaldehyde from the air and improve air quality. Air handling units are devices that regulate air temperature, humidity, or cleanliness, and include, but are not limited to, fans, air conditioners, indoor air conditioners, all-in-one air conditioners, air purifiers, and humidifiers. These include, but are not limited to, floor-standing, vertical-mounted, and wall-mounted indoor air conditioners.

[0033] Specifically, such as Figure 1As shown, the air treatment device 100 includes a shell 200, which has an air inlet, an air outlet 220 and an air treatment duct between the air inlet and the air outlet 220. The formaldehyde filter 100 is usually arranged at the air inlet to remove formaldehyde in the air so that cleaner air can enter the shell 200; of course, the formaldehyde filter 100 can also be arranged in the air treatment duct or at the air outlet 220.

[0034] In one embodiment of the present invention, Figure 2-4 As shown, the formaldehyde filter 100 includes a substrate 10 , and the substrate 10 has a plurality of vent holes 11 extending along a thickness direction of the substrate 10 .

[0035] It should be pointed out that the substrate 10 has a plurality of ventilation holes 11 extending along the thickness direction of the substrate 10, which means that the substrate 10 is provided with a plurality of ventilation holes 11 penetrating the substrate 10 in the thickness direction of the substrate 10. The ventilation holes 11 can be parallel to the thickness direction of the substrate 10, or the depth direction of the ventilation holes 11 can be inclined to the thickness direction of the substrate 10.

[0036] Optionally, a plurality of the vent holes 11 are distributed on the surface of the substrate 10 , and the vent holes 11 are through holes.

[0037] In a specific embodiment, to improve the filtering effect of the formaldehyde removal filter 100, the following methods are adopted: 1) Method 1: The substrate 10 may be made of a catalytic material or the substrate 10 may be made of a catalytic material, the catalytic material including but not limited to at least one of manganese dioxide, titanium dioxide, and silver oxide. In this way, when air flows through the vent 11, the catalytic material in the substrate 10 can act as a catalyst to catalyze a (complex) chemical reaction of formaldehyde in the air, thereby decomposing the formaldehyde into carbon dioxide and water, thereby achieving the purpose of removing formaldehyde from the air. 2) Method 2: The formaldehyde filter 100 may also include a catalytic layer, the catalytic layer being disposed on the surface of the vent 11 wall. In this way, when air flows through the vent 11, the catalytic layer catalyzes a (complex) chemical reaction of formaldehyde in the air, thereby decomposing the formaldehyde into carbon dioxide and water, thereby achieving the purpose of removing formaldehyde from the air. 3) In a third method, the formaldehyde filter 100 may further include a condensation reaction layer capable of reacting with formaldehyde, and the condensation reaction layer may be disposed on the surface of the pore wall of the vent 11. Thus, when air flows through the vent 11, the condensation reaction layer reacts with formaldehyde in the air to remove formaldehyde from the air. [The following text appears to be unrelated and should likely be omitted.]

[0038] In this embodiment, the second method described above is used to improve the filtering effect of the formaldehyde removal filter 100. That is, the formaldehyde filter 100 further includes a catalytic layer, which is disposed on the surface of the pore wall of the vent 11. Specifically, the catalytic layer is made of a catalytic material or is made of a catalytic material, which includes but is not limited to at least one of manganese dioxide, titanium dioxide, and silver oxide.

[0039] Specifically, when air flows through the vents 11, the catalytic material in the catalytic layer acts as a catalyst, catalyzing a (complex) chemical reaction with formaldehyde in the air, decomposing the formaldehyde into carbon dioxide and water, thereby removing formaldehyde from the air. Furthermore, during the formaldehyde decomposition process, the catalytic layer only serves as a catalyst and does not wear out, thereby ensuring a long service life for the formaldehyde filter 100.

[0040] Specifically, the catalytic layer can be provided as a coating or plating layer so that the catalytic layer is firmly attached to the surface of the hole wall of the vent 11, thereby simplifying the manufacturing process of the formaldehyde filter 100 and preventing the catalytic layer from falling off. Of course, the catalytic layer can also be provided on the surface of the hole wall of the vent 11 by other means, such as bonding with an adhesive.

[0041] Furthermore, the cross-sectional area of ​​the vent hole 11 and the hole depth of the vent hole 11 have a cut-to-depth ratio. Since the unit of the cross-sectional area is different from the unit of the hole depth, the unit of the cut-to-depth ratio can be set to mm / mm. 2 , that is, millimeters per square millimeter; the cut depth ratio is greater than or equal to 0.06mm / mm 2 , and less than or equal to 2.5mm / mm 2 The depth of the vent hole 11 is the depth / length of the vent hole 11 , the cross section of the vent hole 11 is the cross section perpendicular to the depth direction of the vent hole 11 , and the cross-sectional depth ratio is the ratio of the cross-sectional area of ​​the vent hole 11 to the depth of the vent hole 11 . The depth of the vent hole 11 is related to the thickness of the substrate 10 : the thicker the substrate 10, the deeper the vent hole 11 ; the thinner the substrate 10, the shallower the depth of the vent hole 11 .

[0042] It can be understood that the smaller the cross-sectional area of ​​the vent holes 11, the more vent holes 11 can be set on the substrate 10 of the same area, that is, the larger the mesh number of the vent holes 11, the greater the wind resistance of the formaldehyde filter 100 and the better the filtering effect; conversely, the larger the cross-sectional area of ​​the vent holes 11, the fewer vent holes 11 are set on the substrate 10 of the same area, that is, the smaller the mesh number of the vent holes 11, the smaller the wind resistance of the formaldehyde filter 100 and the worse the filtering effect.

[0043] The smaller the hole depth of the vent 11, the smaller the hole wall area of ​​the vent 11 (usually can be expressed by the product of the cross-sectional area of ​​the vent 11 and the hole depth of the vent 11), the smaller the wind resistance of the formaldehyde filter 100, and the worse the filtering effect; the larger the hole depth of the vent 11, the larger the hole wall area of ​​the vent 11, the greater the wind resistance of the formaldehyde filter 100, and the better the filtering effect.

[0044] Based on the above analysis, it is easy to know that the smaller the cut-to-depth ratio (which can be achieved by reducing the cross-sectional area of ​​the vent 11 or increasing the hole depth of the vent 11), the greater the wind resistance of the formaldehyde filter 100 and the better the filtering effect; however, if the cut-to-depth ratio is too small, the wind resistance of the formaldehyde filter 100 will be too large, resulting in excessive air volume loss and excessive noise, which is not conducive to air supply of the air treatment device 100.

[0045] The larger the cut-to-depth ratio (which can be achieved by increasing the cross-sectional area of ​​the vent 11 or reducing the hole depth of the vent 11), the smaller the wind resistance of the formaldehyde filter 100 and the worse the filtering effect; however, if the cut-to-depth ratio is too large, the filtering effect of the formaldehyde filter 100 will be too poor.

[0046] Therefore, the cut-to-depth ratio can be greater than or equal to 0.06 mm / mm 2 , and less than or equal to 2.5mm / mm 2 To ensure the filtering effect of the formaldehyde filter 100; and to avoid excessive wind resistance of the formaldehyde filter 100 to ensure the air supply volume, thereby improving the stability of the performance of the formaldehyde filter 100.

[0047] That is, the formaldehyde filter 100 of the present invention has the cut-to-depth ratio greater than or equal to 0.06 mm / mm. 2 , and less than or equal to 2.5mm / mm 2 , which can not only ensure the filtering effect of the formaldehyde filter 100 , but also avoid excessive wind resistance of the formaldehyde filter 100 to ensure the air supply volume, thereby improving the performance stability of the formaldehyde filter 100 .

[0048] It is understood that in order to further improve the stability of the performance of the formaldehyde filter 100, the cut-to-depth ratio can be greater than or equal to 0.1 mm / mm. 2 , and less than or equal to 1mm / mm 2 ; This can further ensure the filtering effect of the formaldehyde filter 100; and can further avoid excessive wind resistance of the formaldehyde filter 100 to further ensure the air supply volume.

[0049] More specifically, the cut-to-depth ratio is greater than or equal to 0.18 mm / mm 2 , and less than or equal to 0.6mm / mm2 .

[0050] It is understood that the formaldehyde filtration performance is related to the cross-sectional shape of the vent 11. The above-mentioned depth ratio is defined below in combination with the shape of the vent 11. Specifically, the cross-sectional shape of the vent 11 is usually polygonal or circular, which are described below respectively.

[0051] In this embodiment, if Figure 2 and 3 As shown, the cross-sectional shape of the vent hole 11 is a triangle.

[0052] It is understood that a triangular structure has a strong stability. Based on this, the formaldehyde filter 100 of the present invention, by configuring the cross-sectional shape of the vent 11 to be triangular, can make the connection between the side walls of the vent 11 relatively stable, strong, and not easily damaged, thereby enhancing the overall structural strength of the formaldehyde filter 100, reducing the risk of damage to the formaldehyde filter 100, and thus extending the service life of the formaldehyde filter 100.

[0053] Specifically, when the cross-sectional shape of the vent hole 11 is a triangle, the section-to-depth ratio may be greater than or equal to 0.06 mm / mm. 2 , and less than or equal to 2.5mm / mm 2 More specifically, the cut-to-depth ratio can be greater than or equal to 0.1 mm / mm. 2 , and less than or equal to mm / mm 2 Preferably, the cut-to-depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6mm / mm 2 .

[0054] Of course, in other embodiments, the cross-sectional shape of the vent hole 11 may also be set to be a quadrilateral, a pentagon, a hexagon, an octagon or a circle.

[0055] It should be noted that when the cross-sectional shape of the vent hole 11 is a quadrilateral, the section-to-depth ratio can be greater than or equal to 0.06 mm / mm. 2 , and less than or equal to 2.2mm / mm 2 More specifically, the cut-to-depth ratio may be greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1.5mm / mm 2 Preferably, the cut-to-depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6mm / mm 2 .

[0056] When the cross-sectional shape of the vent hole 11 is a pentagon, the section-to-depth ratio can be greater than or equal to 0.06 mm / mm. 2 , and less than or equal to 2.1mm / mm 2 More specifically, the cut-to-depth ratio may be greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1.3mm / mm 2 Preferably, the cut-to-depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6mm / mm 2 .

[0057] When the cross-sectional shape of the vent hole 11 is hexagonal, the section-to-depth ratio can be greater than or equal to 0.06 mm / mm. 2 , and less than or equal to 2mm / mm 2 More specifically, the cut-to-depth ratio may be greater than or equal to 0.1 and less than or equal to 1.2 mm / mm 2 Preferably, the cut-to-depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6mm / mm 2 .

[0058] When the cross-sectional shape of the vent hole 11 is an octagon, the section-to-depth ratio can be greater than or equal to 0.06 and less than or equal to 1.9; more specifically, the section-to-depth ratio can be greater than or equal to 0.1 mm / mm. 2 , and less than or equal to 1.1mm / mm 2 Preferably, the cut-to-depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6mm / mm 2 .

[0059] When the cross-sectional shape of the vent hole 11 is circular, the section-to-depth ratio can be greater than or equal to 0.06 mm / mm. 2 , and less than or equal to 1.8mm / mm 2 More specifically, the cut-to-depth ratio may be greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1mm / mm 2 Preferably, the cut-to-depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6mm / mm 2 .

[0060] It is understandable that the filtration performance and wind resistance of formaldehyde filtration are not only related to the hole wall area of ​​the vent 11, but also to the cross-sectional shape of the vent 11, wherein the cross-sectional shape of the vent 11 can affect the time for air to flow in the vent 11. Specifically, the cross-sectional shape of the vent 11 is a polygon (such as a triangle, a quadrilateral, a pentagon, or a hexagon, etc.) or a circle (it can be understood that a circle has infinite sides, that is, the more sides a polygon has, the closer it is to a circle). When the cross-sectional polygon is a regular polygon or approximately a regular polygon, the more sides the cross-sectional polygon has, the larger the angle between two adjacent sides becomes (it can also be understood that the sum of the internal angles of the cross-sectional polygon is larger), so that the flowing air generates fewer or less obvious eddies and turbulence in the vent 11, and the air flow speed in the vent 11 is faster; so for the vent 11 with the same cross-sectional area and the same hole depth, the more sides its cross-sectional polygon has, the shorter the time the flowing air flows in the vent 11, the shorter the contact time of the flowing air with the catalytic material, the worse the filtering effect of the formaldehyde filter 100, and the smaller the wind resistance.

[0061] Therefore, when the number of sides of the cross-sectional polygon increases, the size of the cross-sectional depth ratio can be appropriately reduced.

[0062] In this embodiment, if Figure 4 As shown, the depth direction of the vent hole 11 can be made parallel to the thickness direction of the substrate 10 (allowable error), that is, the depth direction of the vent hole 11 is the thickness direction of the substrate 10, so as to reduce the difficulty of manufacturing the substrate 10 and the formaldehyde filter 100. In this case, the hole depth of the vent hole 11 is the thickness of the substrate 10. Of course, in other embodiments, such as Figure 6 As shown, the depth direction of the vent 11 can also be tilted to the thickness direction of the substrate 10 to increase the hole wall area of ​​the vent 11, thereby increasing the filtration area to improve the filtration efficiency (formaldehyde removal efficiency) and improve the purification effect.

[0063] In this embodiment, the depth direction of the vent hole 11 is parallel to the thickness direction of the substrate 10 (allowable error), and the depth direction of the vent hole 11 is the thickness direction of the substrate 10. The hole depth of the vent hole 11 is the thickness of the substrate 10.

[0064] Furthermore, the mesh number of the vent holes 11 is greater than or equal to 30 and less than or equal to 150.

[0065] It can be understood that the mesh number represents the distribution density of the vent holes 11. If the mesh number of the vent holes 11 is smaller, the vent holes 11 are more sparsely distributed on the formaldehyde filter 100, and the filtering area of ​​the formaldehyde filter 100 is smaller; conversely, if the mesh number of the vent holes 11 is larger, the vent holes 11 are more densely distributed on the formaldehyde filter 100, and the filtering area of ​​the formaldehyde filter 100 is larger, but the wind resistance of the formaldehyde filter 100 is also greater.

[0066] It is understood that if the mesh size of the vent holes 11 is too small, the filtration area of ​​the formaldehyde filter 100 will be too small, significantly reducing the filtration efficiency and purification effect. If the mesh size of the vent holes 11 is too large, the wind resistance of the formaldehyde filter 100 will be too large, significantly reducing the ventilation volume of the formaldehyde filter 100. Therefore, the mesh size of the vent holes 11 is set to be greater than or equal to 30 and less than or equal to 150. More specifically, the mesh size of the vent holes 11 is set to be greater than or equal to 50 and less than or equal to 120. Preferably, the mesh size of the vent holes 11 is set to be greater than or equal to 80 and less than or equal to 100. This ensures the filtration area of ​​the formaldehyde filter 100 while reducing the wind resistance of the formaldehyde filter 100.

[0067] Furthermore, the depth of the vent hole 11 is greater than or equal to 3 mm and less than or equal to 50 mm.

[0068] It is understandable that if the hole depth of the vent 11 is smaller, the air will flow less time in the vent 11 and the filtering area of ​​the formaldehyde filter 100 will be smaller; conversely, if the hole depth of the vent 11 is larger, the air will flow more time in the vent 11 and the filtering area of ​​the formaldehyde filter 100 will be larger, but the wind resistance of the formaldehyde filter 100 will also be greater.

[0069] It is understood that if the vent holes 11 are too shallow, the filtration area of ​​the formaldehyde filter 100 will be too small, significantly reducing filtration efficiency and purification effects. If the vent holes 11 are too deep, the wind resistance of the formaldehyde filter 100 will be too great, significantly reducing the ventilation volume of the formaldehyde filter 100. Therefore, the vent holes 11 are preferably set to have a depth greater than or equal to 3 mm and less than or equal to 50 mm. More specifically, the vent holes 11 have a depth greater than or equal to 5 mm and less than or equal to 30 mm. Preferably, the vent holes 11 have a depth greater than or equal to 10 mm and less than or equal to 20 mm. This ensures the filtration area of ​​the formaldehyde filter 100 while reducing wind resistance.

[0070] In order to facilitate understanding of the present invention, the present invention provides some experimental data, as shown below.

[0071] In the experiment provided by the present invention, the cross-sectional shape of the vent 11 is triangular, and the effect of the change in the cut-depth ratio on the filtering effect and wind resistance of the formaldehyde filter 100 when the mesh size of the vent 11 is 60 mesh, 70 mesh, 95 mesh and 120 mesh is given; wherein the wind resistance is represented by the loss rate of the air volume after the flowing air passes through the formaldehyde filter 100; the filtering effect is represented by the CADR value, which refers to the volume of formaldehyde purified per unit time, and its unit is m 3 / h.

[0072] Table 1

[0073]

[0074]

[0075] In another embodiment of the formaldehyde filter 100 of the present invention, a plurality of inner air-through holes are provided on the wall of the vent hole 11 , and the inner air-through holes communicate with two adjacent vent holes 11 .

[0076] In this way, by providing inner air holes, the flowing air can be circulated in different air holes 11, thereby reducing wind resistance and increasing air supply volume without significantly reducing or reducing the filtering effect of the formaldehyde filter 100, thereby further improving the performance of the formaldehyde filter 100.

[0077] Optionally, a plurality of inner air holes are provided on the wall of any vent hole 11, which can greatly reduce wind resistance and increase air supply volume.

[0078] Optionally, the cross-sectional shape of the vent 11 is polygonal, and the hole wall of the vent 11 includes a plurality of interconnected hole side walls, and the inner air holes on two adjacent or opposite hole side walls are staggered to ensure that the formaldehyde filter 100 has sufficient wind resistance to ensure the filtering and purification effect.

[0079] In this embodiment, the vent holes 11 at the outermost periphery / circle of the substrate 10 further comprise external ventilation holes (not shown) that communicate with the circumference of the substrate 10. The external ventilation holes enable the vent holes 11 to laterally communicate with the external air environment. Thus, when the formaldehyde filter 100 is in use, one end of the vent hole 11 can be blocked (e.g., by providing a sealing plate on one surface of the substrate 10, or by placing one surface of the substrate 10 within a sealed chamber to block one end of the vent hole 11). Thus, the internal ventilation holes and the external ventilation holes can form a lateral ventilation channel, thereby achieving air intake from the substrate surface and air outlet from the circumference of the substrate 10 (i.e., front air intake and side air outlet), or air intake from the circumference and air outlet from the substrate surface (i.e., side air intake and front air outlet). This further increases the time that the flowing air spends in the vent hole 11, thereby improving the filtering effect of the formaldehyde filter 100.

[0080] In another embodiment of the formaldehyde filter 100 of the present invention, Figure 5 As shown, the vent 11 includes a tapered section, the cross-sectional area of ​​which increases or decreases in the thickness direction of the substrate 10. This increases the wall area of ​​the vent 11, thereby effectively increasing the filtration area of ​​the formaldehyde filter 100, thereby effectively improving the filtration effect of the formaldehyde filter 100 and enhancing the purification efficiency.

[0081] In this embodiment, further, Figure 5 As shown, the cross-sectional area of ​​the vent 11 increases or decreases in the depth direction of the vent 11, that is, the entire vent 11 is a tapering section, that is, the vent 11 is configured to be contracted or expanded in the depth direction of the vent 11, thereby further increasing the pore wall area of ​​the vent 11, thereby effectively improving the filtering effect of the formaldehyde filter 100 and improving the purification efficiency.

[0082] In this embodiment, further, Figure 5 As shown, the vent hole 11 has a larger opening end and a smaller opening end, and the opening area of ​​the larger opening end has a reduction ratio with respect to the opening area of ​​the smaller opening end, and the reduction ratio is greater than 1 and less than or equal to 10. The reduction ratio refers to the ratio of the opening area of ​​the larger opening end to the opening area of ​​the smaller opening end.

[0083] It can be understood that the larger the reduction ratio, the larger the wall area of ​​the vent 11, and thus the greater the wind resistance. In other words, if the reduction ratio is too small, the increased wall area of ​​the vent 11 will be ineffective, resulting in a less effective filtration effect of the formaldehyde filter 100. If the reduction ratio is too large, the wind resistance of the formaldehyde filter 100 will be excessive, leading to excessive air volume loss and excessive noise, which will be detrimental to air delivery by the air treatment device 100. Therefore, the reduction ratio can be selected to be greater than 1 and less than or equal to 10, to ensure both the filtration effect of the formaldehyde filter 100 and excessive wind resistance, thereby ensuring a sufficient air volume.

[0084] More specifically, the reduction ratio is greater than or equal to 1.5 and less than or equal to 8.

[0085] In this embodiment, further, Figure 5As shown, the cross-sectional area of ​​the vent 11 increases or decreases linearly in the depth direction of the vent 11. That is, the longitudinal section of the vent 11 is formed by two oblique lines. The longitudinal section of the vent 11 refers to a section parallel to the depth direction of the vent 11, such as a section passing through the centerline of the vent 11. This reduces the difficulty of manufacturing the formaldehyde filter 100 and improves its manufacturing efficiency. Of course, the cross-sectional area of ​​the vent 11 can also be decreased or increased in other ways, such as forming two arcs in the longitudinal section of the vent 11 to further increase the wall area of ​​the vent 11.

[0086] In this embodiment, it can be understood that if Figure 5 As shown, to save costs and other reasons, the wall thickness of the vent holes 11 is usually uniform. Thus, when the cross-sectional area of ​​one vent hole 11 decreases from one surface of the substrate 10 toward the other, the cross-sectional area of ​​the adjacent vent hole 11 decreases in the opposite direction (i.e., increases in the same direction). In other words, when one vent hole 11 is configured to taper from one end toward the other, the adjacent vent hole 11 will be configured to taper in the opposite direction (i.e., expand in the same direction). In other words, the changing trends of the two adjacent vent holes 11 are opposite. This not only further increases the wall area of ​​the vent holes 11, improving purification efficiency, but also saves material.

[0087] It should be noted that the technical solutions of the above-mentioned embodiments of the formaldehyde filter 100 of the present invention may be combined with each other, but this must be based on the premise that they can be implemented by a person of ordinary skill in the art. If the combination of technical solutions is inconsistent or cannot be implemented, it shall be deemed that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention. For example, when the cross-sectional area of ​​the vent 11 increases or decreases in the depth direction of the vent 11, the cross-sectional area of ​​the vent 11 at any position must meet the following requirements: the section-to-depth ratio is greater than or equal to 0.06 and less than or equal to 2.5.

[0088] Furthermore, the substrate 10 is made of a paper material. In this embodiment, the substrate 10 can be made of a rough-surfaced paper material to increase the adhesion area and adhesion strength of the catalytic layer, thereby improving the purification capacity of the formaldehyde filter 100 and effectively reducing the production cost of the formaldehyde filter 100.

[0089] The present invention also provides an air treatment device. Figure 1As shown, the air treatment device includes a shell 200 and a formaldehyde filter 100. The shell 200 has an air inlet, an air outlet 220 and an air treatment duct connecting the air inlet and the air outlet 220. The formaldehyde filter 100 is arranged at the air inlet; or, the formaldehyde filter 100 is arranged in the air treatment duct; or, the formaldehyde filter 100 is arranged at the air outlet 220.

[0090] Specifically, the specific structure of the formaldehyde filter 100 refers to the above embodiments. Since the air treatment device of the present invention adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0091] Specifically, the air handling device 100 refers to a device that can adjust the temperature, humidity, or cleanliness of air, and includes but is not limited to any one of a fan, an air conditioner, an air conditioner indoor unit, an integrated air conditioner, an air purifier, and an air humidifier. The air conditioner indoor unit includes but is not limited to a floor-standing air conditioner indoor unit, a vertically mounted air conditioner indoor unit, and a wall-mounted air conditioner indoor unit.

[0092] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A formaldehyde filter, characterized in that: The formaldehyde filter comprises a substrate, wherein the substrate has a plurality of vents extending in a thickness direction of the substrate, wherein a cross-sectional area of ​​the vents and a hole depth of the vents have a cut-to-depth ratio, and the cut-to-depth ratio is greater than or equal to 0.06 mm / mm 2 , and less than or equal to 2.5mm / mm 2 ; A plurality of inner air-passing holes are arranged on the hole wall of the air-passing hole, and the inner air-passing holes are connected with two adjacent air-passing holes; The vent holes at the outermost periphery / circle of the substrate have outer air holes connected to the circumferential surface of the substrate, and the outer air holes connect the vent holes laterally with the external air environment. A sealing plate is provided on one surface of the substrate, or a surface of the substrate is provided in a closed cavity to block one end of the vent holes, so that the inner air holes and the outer air holes form a lateral ventilation channel.

2. The formaldehyde filter according to claim 1, characterized in that: The cut-to-depth ratio is greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1mm / mm 2 .

3. The formaldehyde filter according to claim 1, characterized in that: The cross-sectional shape of the vent hole is a triangle.

4. The formaldehyde filter according to claim 1, characterized in that: The cross-sectional shape of the vent hole is circular, and the cross-sectional depth ratio is greater than or equal to 0.06 mm / mm 2 , and less than or equal to 1.8mm / mm 2 .

5. The formaldehyde filter according to claim 1, characterized in that: The vent hole has a depth greater than or equal to 3 mm and less than or equal to 50 mm; and / or The mesh number of the vent holes is greater than or equal to 30 and less than or equal to 150; and / or A depth direction of the vent hole is inclined with respect to a thickness direction of the substrate.

6. The formaldehyde filter according to any one of claims 1 to 5, characterized in that: The formaldehyde filter screen further comprises a catalytic layer, and the catalytic layer is arranged on the surface of the hole wall of the vent hole.

7. The formaldehyde filter according to claim 6, characterized in that: The manufacturing material of the substrate includes paper material; and / or, The preparation material of the catalytic layer includes at least one of manganese dioxide and titanium dioxide.

8. An air treatment device, characterized in that: It comprises a shell and a formaldehyde filter as described in any one of claims 1 to 7, the shell having an air inlet, an air outlet and an air treatment duct connecting the air inlet and the air outlet, the formaldehyde filter being arranged at the air inlet; or, the formaldehyde filter being arranged in the air treatment duct; or, the formaldehyde filter being arranged at the air outlet.

9. The air treatment device according to claim 8, characterized in that: The air treatment device is any one of a fan, an air machine, an air conditioner indoor unit, an all-in-one air conditioner, an air purifier and an air humidifier.

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