Formaldehyde filter and air treatment device

Abstract

The present invention discloses a formaldehyde filter and an air treatment device. Among them, the formaldehyde filter includes a substrate, the substrate has a plurality of ventilation holes extending along the thickness direction of the substrate, the ventilation holes include a reduced section, and the cross-sectional area of the reduced section increases or decreases in the thickness direction of the substrate. In this way, the pore wall area of the ventilation holes can be increased, which is beneficial to effectively increase the filtration area of the formaldehyde filter, thereby effectively improving the filtration effect of the formaldehyde filter and improving the purification efficiency.

Description

Technical Field

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

[0002] In related technologies, the ventilation holes of a formaldehyde filter screen are usually set as straight holes, which cannot effectively improve the filtering effect of the formaldehyde filter screen. Summary of the Invention

[0003] The main object of the present invention is to propose a formaldehyde filter screen, aiming to solve the technical problem in the prior art that the filtering effect of the formaldehyde filter screen cannot be effectively improved.

[0004] To achieve the above object, the present invention proposes a formaldehyde filter screen, which includes a substrate. The substrate has a plurality of ventilation holes extending along the thickness direction of the substrate. The ventilation holes include a reduced section, and the cross-sectional area of the reduced section increases or decreases in the thickness direction of the substrate.

[0005] Optionally, the cross-sectional area of the ventilation holes increases or decreases in the thickness direction of the substrate.

[0006] Optionally, the ventilation holes have a larger opening end and a smaller opening end. The opening area of the larger opening end and the opening area of the smaller opening end have a reduction ratio, and the reduction ratio is greater than 1 and less than or equal to 10.

[0007] Optionally, the reduction ratio is greater than or equal to 1.5 and less than or equal to 8.

[0008] Optionally, the changing trends of two adjacent ventilation holes are opposite.

[0009] Optionally, the longitudinal section of the ventilation holes is two oblique lines or two arcs.

[0010] Optionally, the formaldehyde filter screen further includes a catalytic layer, and the catalytic layer is disposed on the surface of the pore wall of the ventilation holes; and / or,

[0011] the mesh number of the ventilation holes is greater than or equal to 30 and less than or equal to 150; and / or,

[0012] the thickness of the substrate is greater than or equal to 3 mm and less than or equal to 50 mm.

[0013] Optionally, a plurality of inner ventilation through holes are provided on the pore wall of the ventilation holes, and the inner ventilation through holes communicate two adjacent ventilation holes.

[0014] The present invention also provides an air treatment device, which includes a housing and a formaldehyde filter screen. The housing has an air inlet, an air outlet, and an air treatment air duct disposed between the air inlet and the air outlet, and the formaldehyde filter screen is disposed at the air inlet; alternatively, the formaldehyde filter screen is disposed in the air treatment air duct; alternatively, the formaldehyde filter screen is disposed at the air outlet.

[0015] Optionally, the air treatment device is any one of a fan, an air conditioner, an indoor unit of an air conditioner, an integrated air conditioner, an air purifier, and an air humidifier.

[0016] For the formaldehyde filter screen of the present invention, by providing a reduction section in the ventilation hole and making the cross-sectional area of the reduction section increase or decrease in the thickness direction of the substrate, the hole wall area of the ventilation hole can be increased, which is beneficial to effectively increase the filtering area of the formaldehyde filter screen, thereby effectively improving the filtering effect of the formaldehyde filter screen and improving the purification efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the air treatment device of the present invention;

[0019] Figure 2 It is Figure 1 a schematic structural diagram of the formaldehyde filter screen in

[0020] Figure 3 It is Figure 2 a partial enlarged view of part A in

[0021] Figure 4 It is a schematic cross-sectional view of the formaldehyde filter screen along the Figure 2 line I-I in

[0022] Figure 5 It is a schematic cross-sectional structure diagram of another embodiment of the formaldehyde filter screen of the present invention;

[0023] Figure 6 It is Figure 5 a partial enlarged view of part B in

[0024] Figure 7 It is a schematic cross-sectional view of the formaldehyde filter screen along the Figure 5 line II-II in

[0025] Figure 8 This is a schematic structural diagram of another embodiment of the formaldehyde filter net of the present invention;

[0026] Figure 9 This is a schematic cross-sectional structural diagram of the fifth embodiment of the formaldehyde filter net of the present invention.

[0027] Explanation of the reference numerals in the drawings:

[0028] Reference numeral Name Reference numeral Name 100 Formaldehyde filter 112 Smaller opening end 10 Substrate 1000 Air treatment device 11 Vent hole 200 Housing 111 Larger opening end 220 Air outlet

[0029] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0031] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0032] In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B at the same time.

[0033] The present invention provides a formaldehyde filter net and an air treatment device.

[0034] The formaldehyde filter net is applied to an air treatment device to remove formaldehyde in the air and improve air quality. The air treatment device refers to a device that can adjust the temperature, humidity, cleanliness, etc. of the air, including but not limited to fans, air machines, air conditioner indoor units, air conditioner all-in-ones, air purifiers, air humidifiers, etc. Among them, the air conditioner indoor unit includes but not limited to floor-standing air conditioner indoor units, vertical wall-mounted air conditioner indoor units, and wall-mounted air conditioner indoor units.

[0035] Specifically, as Figure 1As shown, the air treatment device 1000 includes a housing 200 having an air inlet, an air outlet 220, and an air treatment air 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 relatively clean air enters the housing 200. Of course, the formaldehyde filter 100 can also be arranged in the air treatment air duct or at the air outlet 220.

[0036] In a specific embodiment of the present invention, as Figures 2-5 shown, the formaldehyde filter 100 includes a substrate 10 having a plurality of ventilation holes 11 extending in the thickness direction of the substrate 10.

[0037] It should be noted that the substrate 10 having a plurality of ventilation holes 11 extending in the thickness direction of the substrate 10 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.

[0038] Optionally, a plurality of the ventilation holes 1111 are distributed on the surface of the substrate 10, and the ventilation holes 1111 are through holes.

[0039] In a specific embodiment, to improve the filtering effect of the formaldehyde filter 100, the following methods are adopted: 1) Method 1: The preparation material of the substrate 10 includes a catalytic material or the substrate 10 is prepared from a catalytic material, and the catalytic material includes at least one of manganese dioxide, titanium dioxide, silver oxide, etc.; thus, when air flows through the ventilation holes 11, the catalytic material in the substrate 10 can act as a catalyst to catalyze the formaldehyde in the air to undergo a (complex) chemical reaction to decompose the formaldehyde into carbon dioxide and water, so as to achieve the purpose of removing formaldehyde in the air. 2) Method 2: The formaldehyde filter 100 further includes a catalytic layer provided on the surface of the pore wall of the ventilation holes 11; thus, when air flows through the ventilation holes 11, the catalytic layer will catalyze the formaldehyde in the air to undergo a (complex) chemical reaction to decompose the formaldehyde into carbon dioxide and water, so as to achieve the purpose of removing formaldehyde in the air. 3) Method 3: The formaldehyde filter 100 further includes a condensation reaction layer that can undergo a condensation reaction with formaldehyde, and the condensation reaction layer is provided on the surface of the pore wall of the ventilation holes 11; thus, when air flows through the ventilation holes 11, the condensation reaction layer will undergo a condensation chemical reaction with the formaldehyde in the air, so as to achieve the purpose of removing formaldehyde in the air. And so on.

[0040] In an example of the present invention, the above-mentioned method two is adopted to improve the filtering effect of the formaldehyde filter net 100. That is, the formaldehyde filter net 100 further includes a catalytic layer, and the catalytic layer is arranged on the surface of the pore wall of the ventilation hole 11. Specifically, the preparation material of the catalytic layer includes a catalytic material or the catalytic layer is prepared from a catalytic material, and the catalytic material includes but is not limited to at least one of manganese dioxide, titanium dioxide, silver oxide, etc.

[0041] Specifically, when air flows through the ventilation hole 11, the catalytic material of the catalytic layer can act as a catalyst to catalyze the (complex) chemical reaction of formaldehyde in the air, so as to decompose formaldehyde into carbon dioxide and water, thereby achieving the purpose of removing formaldehyde in the air. Moreover, during the decomposition process of formaldehyde, since the catalytic layer only plays a catalytic role and will not be consumed, the formaldehyde filter net 100 has a long service life.

[0042] Specifically, the catalytic layer can be set as a coating or a plating layer, so that the catalytic layer is firmly attached to the surface of the pore wall of the ventilation hole 11, which simplifies the manufacturing process of the formaldehyde filter net 100 and can prevent the catalytic layer from falling off. Of course, the catalytic layer can also be arranged on the surface of the pore wall of the ventilation hole 11 by other means, such as bonding with an adhesive.

[0043] In an embodiment of the present invention, the cross-sectional area of the ventilation hole 11 and the hole depth of the ventilation hole 11 have a cut-off depth ratio. Since the unit of the cross-sectional area is different from the unit of the hole depth, the unit of the cut-off depth ratio can be set as mm / mm 2 , that is, millimeters per square millimeter; the cut-off depth ratio is greater than or equal to 0.06 mm / mm 2 , and less than or equal to 2.5 mm / mm 2 . Wherein, the hole depth of the ventilation hole 11 is the depth / length of the ventilation hole 11, the cross-section of the ventilation hole 11 refers to the section perpendicular to the depth direction of the ventilation hole 11, and the cut-off depth ratio refers to the ratio of the cross-sectional area of the ventilation hole 11 to the hole depth of the ventilation hole 11. Among them, the depth of the ventilation hole 11 is related to the thickness of the substrate 10. The thicker the substrate 10, the greater the depth of the ventilation hole 11; the thinner the substrate 10, the smaller the depth of the ventilation hole 11.

[0044] It can be understood that the smaller the cross-sectional area of the ventilation hole 11, the more ventilation holes 11 can be arranged on the substrate 10 with the same area, that is, the larger the mesh number of the ventilation holes 11, the greater the air resistance of the formaldehyde filter net 100, and the better the filtering effect; on the contrary, the larger the cross-sectional area of the ventilation hole 11, the fewer ventilation holes 11 are arranged on the substrate 10 with the same area, that is, the smaller the mesh number of the ventilation holes 11, the smaller the air resistance of the formaldehyde filter net 100, and the worse the filtering effect.

[0045] The smaller the depth of the ventilation hole 11, the smaller the wall area of the ventilation hole 11 (usually expressed as the product of the cross-sectional area of the ventilation hole 11 and the depth of the ventilation hole 11), the smaller the wind resistance of the formaldehyde filter net 100, and the worse the filtering effect; the larger the depth of the ventilation hole 11, the larger the wall area of the ventilation hole 11, the larger the wind resistance of the formaldehyde filter net 100, and the better the filtering effect.

[0046] Based on the above analysis, it is easy to know that the smaller the cut-off depth ratio (which can be achieved by reducing the cross-sectional area of the ventilation hole 11 or increasing the depth of the ventilation hole 11), the greater the wind resistance of the formaldehyde filter net 100, and the better the filtering effect; however, if the cut-off depth ratio is too small, the wind resistance of the formaldehyde filter net 100 will be too large, resulting in excessive air volume loss and excessive noise, which is not conducive to the air supply of the air treatment device 1000.

[0047] The larger the cut-off depth ratio (which can be achieved by increasing the cross-sectional area of the ventilation hole 11 or reducing the depth of the ventilation hole 11), the smaller the wind resistance of the formaldehyde filter net 100, and the worse the filtering effect; however, if the cut-off depth ratio is too large, the filtering effect of the formaldehyde filter net 100 will be too poor.

[0048] Therefore, the cut-off depth ratio can be made greater than or equal to 0.06 mm / mm 2 and less than or equal to 2.5 mm / mm 2 ; so as to ensure both the filtering effect of the formaldehyde filter net 100 and avoid excessive wind resistance of the formaldehyde filter net 100 to ensure the air supply volume, thereby improving the stability of the performance of the formaldehyde filter net 100.

[0049] That is to say, for the formaldehyde filter net 100 of the present invention, by making the cut-off depth ratio greater than or equal to 0.06 mm / mm 2 and less than or equal to 2.5 mm / mm 2 , it can ensure both the filtering effect of the formaldehyde filter net 100 and avoid excessive wind resistance of the formaldehyde filter net 100 to ensure the air supply volume, thereby improving the stability of the performance of the formaldehyde filter net 100.

[0050] It can be understood that in order to further improve the stability of the performance of the formaldehyde filter net 100, the cut-off depth ratio can be made greater than or equal to 0.1 mm / mm 2 and less than or equal to 1 mm / mm 2 ; thereby further ensuring the filtering effect of the formaldehyde filter net 100 and further avoiding excessive wind resistance of the formaldehyde filter net 100 to further ensure the air supply volume.

[0051] More specifically, the cut-off depth ratio is greater than or equal to 0.18 mm / mm 2 and less than or equal to 0.6 mm / mm2 。

[0052] It can be understood that the filtration performance of the formaldehyde filtration is related to the cross-sectional shape of the ventilation holes 11. Hereinafter, in combination with the shape of the ventilation holes 11, the above-mentioned cut depth ratio will be defined. Specifically, the cross-sectional shape of the ventilation holes 11 is usually polygonal or circular, and the following will be described separately.

[0053] In this embodiment, as Figure 2 and 3 shown, the cross-sectional shape of the ventilation holes 11 is triangular.

[0054] It can be understood that the triangular structure has strong stability. Based on this, for the formaldehyde filter net 100 of the present invention, by setting the cross-sectional shape of the ventilation holes 11 to be triangular, the connection between the side walls of the hole walls of the ventilation holes 11 can be relatively stable, firm and not easily damaged, thereby enhancing the overall structural strength of the formaldehyde filter net 100 and reducing the risk of damage to the formaldehyde filter net 100, so as to improve the service life of the formaldehyde filter net 100.

[0055] Specifically, when the cross-sectional shape of the ventilation holes 11 is triangular, the cut depth ratio can be selected to be greater than or equal to 0.06 mm / mm 2 , and less than or equal to 2.5 mm / mm 2 . More specifically, the cut depth ratio can be made greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1.8 mm / mm 2 . Preferably, the cut depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6 mm / mm 2 .

[0056] In another embodiment of the present invention, as Figures 5-7 shown, the cross-sectional shape of the ventilation holes 11 is polygonal, and the number of sides of the cross-section of the ventilation holes 11 is greater than or equal to 4.

[0057] It can be understood that the filtration performance and air resistance of formaldehyde filtration are not only related to the pore wall area of the ventilation holes 11, but also related to the cross-sectional shape of the ventilation holes 11. Among them, the cross-sectional shape of the ventilation holes 11 can affect the flow time of air in the ventilation holes 11. Specifically, the cross-sectional shape of the ventilation holes 11 is a polygon (such as a triangle, quadrilateral, pentagon, hexagon, or octagon, etc.) or a circle (it can be understood that a circle has an infinite number of 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 included angle between adjacent sides becomes (it can also be understood that the sum of the interior angles of the cross-sectional polygon is larger), so that the phenomenon of vortex and turbulent flow of the flowing air in the ventilation holes 11 is less or less obvious, and the flow velocity of the air in the ventilation holes 11 can be made faster; therefore, for the ventilation holes 11 with the same cross-sectional area and the same hole depth, the more sides the cross-sectional polygon has, the shorter the flow time of the flowing air in the ventilation holes 11, the shorter the contact time between the flowing air and the catalytic material, and the worse the filtration effect of the formaldehyde filter mesh 100, and the smaller the air resistance. Therefore, when the number of sides of the cross-sectional polygon increases, the depth-to-width ratio can be appropriately reduced.

[0058] Therefore, for the formaldehyde filter mesh 100 of the present invention, by making the cross-sectional shape of the ventilation holes 11 a polygon and making the number of sides of the cross-section of the ventilation holes 11 greater than or equal to 4, it is beneficial to shorten the flow time of the flowing air in the ventilation holes 11, thereby being beneficial to reducing the air resistance of the formaldehyde filter mesh 100, so that it is convenient to manufacture a formaldehyde filter mesh 100 with a smaller air resistance.

[0059] Specifically, the cross-sectional shape of the ventilation holes 11 is a regular polygon (allowing for manufacturing errors) or a circle (allowing for manufacturing errors). In this way, it is convenient to reduce the manufacturing difficulty of the formaldehyde filter mesh 100.

[0060] In this embodiment, specifically, the cross-sectional shape of the ventilation holes 11 can be set to a quadrilateral, pentagon, hexagon, octagon, or circle, etc., which will be described separately below.

[0061] When the cross-sectional shape of the ventilation holes 11 is a quadrilateral, the depth-to-width ratio can be made greater than or equal to 0.06 mm / mm 2 , and less than or equal to 2.2 mm / mm 2 ; more specifically, the depth-to-width ratio can be made greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1.5 mm / mm 2 . Preferably, the depth-to-width ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6 mm / mm 2 .

[0062] Specifically, the cross-sectional shape of the vent hole 11 can be selected as a rectangle.

[0063] When the cross-sectional shape of the vent hole 11 is a pentagon, the cutting depth ratio can be made greater than or equal to 0.06 mm / mm 2 , and less than or equal to 2.1 mm / mm 2 ; More specifically, the cutting depth ratio can be made greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1.3 mm / mm 2 . Preferably, the cutting depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6 mm / mm 2 .

[0064] Specifically, the cross-sectional shape of the vent hole 11 can be selected as a regular pentagon.

[0065] When the cross-sectional shape of the vent hole 11 is a hexagon, the cutting depth ratio can be made greater than or equal to 0.06 mm / mm 2 , and less than or equal to 2 mm / mm 2 ; More specifically, the cutting depth ratio can be made greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1.2 mm / mm 2 . Preferably, the cutting depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6 mm / mm 2 .

[0066] Specifically, the cross-sectional shape of the vent hole 11 can be selected as a regular hexagon.

[0067] When the cross-sectional shape of the vent hole 11 is an octagon, the cutting depth ratio can be made greater than or equal to 0.06 mm / mm 2 , and less than or equal to 1.9 mm / mm 2 ; More specifically, the cutting depth ratio can be made greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1.1 mm / mm 2 . Preferably, the cutting depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6 mm / mm 2 .

[0068] Specifically, the cross-sectional shape of the vent hole 11 can be selected as a regular octagon.

[0069] When the cross-sectional shape of the vent hole 11 is a circle, the cutting depth ratio can be made greater than or equal to 0.06 mm / mm 2, and less than or equal to 1.8 mm / mm 2 ; More specifically, the cutting depth ratio can be made greater than or equal to 0.1 mm / mm 2 , and less than or equal to 1 mm / mm 2 . Preferably, the cutting depth ratio is greater than or equal to 0.2 mm / mm 2 , and less than or equal to 0.6 mm / mm 2 .

[0070] For the convenience of understanding the present invention, the present invention provides some experimental data as follows.

[0071] In the experiment provided by the present invention, the cross-sectional shape of the ventilation hole 11 is triangular, and the influence of the change of the cutting depth ratio on the filtration effect and air resistance of the formaldehyde filter net 100 is given when the mesh numbers of the ventilation hole 11 are 60 mesh, 70 mesh, 95 mesh and 120 mesh respectively; wherein, the air resistance is represented by the loss rate of the air volume when the flowing air passes through the formaldehyde filter net 100; the filtration effect is represented by the CADR value, and the CADR value refers to the volume of purified formaldehyde per unit time, and its unit is m 3 / h.

[0072] Table 1

[0073]

[0074]

[0075] It can be easily seen from Table 1 that within a certain range, when the cutting depth ratio increases, the air volume loss after the flowing air passes through the formaldehyde filter net 100 becomes smaller, and the purification effect also becomes worse.

[0076] In another embodiment of the formaldehyde filter net 100 of the present invention, a plurality of inner air passing holes are provided on the pore wall of the ventilation hole 11, and the inner air passing holes communicate two adjacent ventilation holes 11.

[0077] In this way, by arranging the inner air passing holes, the flowing air can be circulated in different ventilation holes 11, so that the air resistance can be reduced and the air supply volume can be increased on the premise of not significantly reducing or not reducing the filtration effect of the formaldehyde filter net 100, thereby further improving the performance of the formaldehyde filter net 100.

[0078] Optionally, a plurality of inner air passing holes are provided on the pore wall of any ventilation hole 11. In this way, the air resistance can be greatly reduced and the air supply volume can be increased.

[0079] Optionally, the cross-sectional shape of the vent hole 11 is polygonal, and the hole wall of the vent hole 11 includes a plurality of interconnected hole side walls. The inner air passing holes on two adjacent or opposite hole side walls are staggered to ensure that the formaldehyde filter net 100 has sufficient air resistance and ensure the filtering and purification effects.

[0080] In this embodiment, further, the vent hole 11 at the outermost periphery / circle of the substrate 10 has an outer air passing hole (not shown in the figure) communicating with the peripheral surface of the substrate 10, and the outer air passing hole can realize the lateral communication between the vent hole 11 and the external air environment. Thus, when the formaldehyde filter net 100 is in use, one end of the vent hole 11 can be blocked (for example, by setting a sealing plate on one plate surface of the substrate 10, or by placing one plate surface of the substrate 10 in a sealed cavity to block one end of the vent hole 11). In this way, the inner air passing hole and the outer air passing hole can form a lateral ventilation channel to realize air intake from the plate surface of the substrate 10 and air outlet from the peripheral surface (i.e., positive air intake and lateral air outlet), or air intake from the peripheral surface and air outlet from the plate surface (i.e., lateral air intake and positive air outlet), thereby further increasing the flowing time of the flowing air in the vent hole 11 and improving the filtering effect of the formaldehyde filter net 100.

[0081] In another embodiment of the formaldehyde filter net 100 of the present invention, as Figure 8 shown, the vent hole 11 includes a reduced section, and the cross-sectional area of the reduced section increases or decreases in the thickness direction of the substrate 10. Thus, the hole wall area of the vent hole 11 can be increased, which is beneficial to effectively increasing the filtering area of the formaldehyde filter net 100, thereby effectively improving the filtering effect of the formaldehyde filter net 100 and improving the purification efficiency.

[0082] In this embodiment, further, as Figure 8 shown, the cross-sectional area of the vent hole 11 increases or decreases in the depth direction of the vent hole 11, that is, the entire vent hole 11 is a reduced section, that is, the vent hole 11 is provided with a reduced or enlarged opening in the depth direction of the vent hole 11. Thus, the hole wall area of the vent hole 11 can be further increased, thereby effectively improving the filtering effect of the formaldehyde filter net 100 and improving the purification efficiency.

[0083] In this embodiment, further, as Figure 8 shown, the vent hole 11 has a larger opening end 111 and a smaller opening end 112, and there is a reduction ratio between the opening area of the larger opening end 111 and the opening area of the smaller opening end 112. 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 111 to the opening area of the smaller opening end 112.

[0084] It can be understood that the larger the reduction ratio is, the larger the pore wall area of the ventilation hole 11 is, and the greater the wind resistance is. That is to say, if the reduction ratio is too small, the increase effect of the pore wall area of the ventilation hole 11 will not be obvious, resulting in an unclear filtering effect of the formaldehyde filter screen 100; if the reduction ratio is too large, the wind resistance of the formaldehyde filter screen 100 will be too large, resulting in excessive air volume loss and excessive noise, which is not conducive to the air supply of the air treatment device 1000. Therefore, the reduction ratio is optionally greater than 1 and less than or equal to 10, so as to ensure the filtering effect of the formaldehyde filter screen 100 and avoid excessive wind resistance of the formaldehyde filter screen 100 to ensure the air supply volume.

[0085] More specifically, the reduction ratio is greater than or equal to 1.5 and less than or equal to 8.

[0086] In this embodiment, further, as Figure 8 shown, the cross-sectional area of the ventilation hole 11 increases or decreases linearly in the depth direction of the ventilation hole 11. That is to say, the longitudinal section of the ventilation hole 11 is two oblique lines; wherein, the longitudinal section of the ventilation hole 11 refers to the section parallel to the depth direction of the ventilation hole 11, such as the section passing through the center line of the ventilation hole 11. In this way, the manufacturing difficulty of the formaldehyde filter screen 100 can be reduced, and the manufacturing efficiency of the formaldehyde filter screen 100 can be improved. Of course, the cross-sectional area of the ventilation hole 11 can also be decreased or increased by other means, such as the longitudinal section of the ventilation hole 11 being two arcs, to further increase the pore wall area of the ventilation hole 11.

[0087] In this embodiment, it can be understood that, as Figure 8 shown, for reasons such as cost saving, the pore wall thickness of the ventilation hole 11 is usually the same. In this way, when the cross-sectional area of a ventilation hole 11 decreases from one plate surface of the substrate 10 to the other plate surface, the cross-sectional area of another adjacent ventilation hole 11 decreases in the opposite direction (i.e., increases in the same direction). In other words, when a ventilation hole 11 is provided with a reduced opening from one end to the other end, another adjacent ventilation hole 11 will be provided with a reduced opening in the opposite direction (i.e., an increased opening in the same direction). That is to say, the change trends of two adjacent ventilation holes 11 are opposite. In this way, not only can the pore wall area of the ventilation hole 11 be further increased to improve the purification efficiency, but also materials can be saved.

[0088] To facilitate the understanding of the present invention, some experimental data are provided in this embodiment as follows.

[0089] In the experiment provided by this embodiment, when the cross-sectional shapes of the ventilation holes 11 are triangular, rectangular, and circular respectively, the influence of the change in the taper ratio on the filtration effect and air resistance of the formaldehyde filter net 100 is given; among them, the air resistance is represented by the loss rate of the air volume after the flowing air passes through the formaldehyde filter net 100; the filtration effect is represented by the CADR value, and the CADR value refers to the volume of purified formaldehyde per unit time, and its unit is m 3 / h.

[0090] Table 2

[0091]

[0092]

[0093] It can be easily seen from Table 2 that within a certain range, when the taper ratio increases, the air volume loss after the flowing air passes through the formaldehyde filter net 100 becomes larger, but the purification effect becomes better.

[0094] In the fifth embodiment of the formaldehyde filter net 100 of the present invention, as Figure 9 shown, the depth direction of the ventilation hole 11 is inclined to the thickness direction of the substrate 10 to increase the pore wall area of the ventilation hole 11, that is, the filtration area can be increased to improve the filtration efficiency (formaldehyde removal efficiency) and the purification effect can be improved. Of course, in other embodiments, as Figure 4 and 7 shown, the depth direction of the ventilation hole 11 can also be parallel to the thickness direction of the substrate 10 (allowing for errors), that is to say, the depth direction of the ventilation hole 11 is the thickness direction of the substrate 10 to reduce the manufacturing difficulty of the substrate 10 and the formaldehyde filter net 100. At this time, the hole depth of the ventilation hole 11 is the thickness of the substrate 10.

[0095] In the sixth embodiment of the formaldehyde filter net 100 of the present invention, the pore wall of the ventilation hole 11 can be arranged in a wavy shape, so as to not only increase the attachment area of the catalytic layer and improve the attachment strength, but also be beneficial to increasing the filtration area to enhance the purification effect.

[0096] It should be noted that the technical solutions between the above-mentioned various embodiments of the formaldehyde filter net 100 of the present invention can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. For example, when the cross-sectional area of the ventilation hole 11 increases or decreases in the depth direction of the ventilation hole 11, the cross-section of the ventilation hole 11 at any position should satisfy that the cut-off ratio is greater than or equal to 0.06 and less than or equal to 2.5.

[0097] Further, the manufacturing material of the substrate 10 includes paper material. In this embodiment, the manufacturing material of the substrate 10 can be selected as a paper material with a rough surface to increase the attachment area and attachment strength of the catalytic layer, improve the purification ability of the formaldehyde filter net 100, and in addition, can effectively reduce the production cost of the formaldehyde filter net 100.

[0098] Further, the mesh number of the ventilation holes 11 is greater than or equal to 30 and less than or equal to 150.

[0099] It can be understood that the mesh number represents the distribution density of the ventilation holes 11. If the mesh number of the ventilation holes 11 is smaller, the distribution of the ventilation holes 11 on the formaldehyde filter net 100 is sparser, and the filtration area of the formaldehyde filter net 100 is smaller; conversely, if the mesh number of the ventilation holes 11 is larger, the distribution of the ventilation holes 11 on the formaldehyde filter net 100 is denser, and the filtration area of the formaldehyde filter net 100 is larger, but the air resistance of the formaldehyde filter net 100 is also larger.

[0100] It can be understood that if the mesh number of the ventilation holes 11 is too small, the filtration area of the formaldehyde filter net 100 will be too small, which will greatly reduce the filtration efficiency and purification effect. If the mesh number of the ventilation holes 11 is too large, the air resistance of the formaldehyde filter net 100 will be too large, which will greatly reduce the ventilation volume of the formaldehyde filter net 100, etc. Therefore, the mesh number of the ventilation holes 11 is set to be greater than or equal to 30 and less than or equal to 150. More specifically, the mesh number of the ventilation holes 11 is set to be greater than or equal to 50 and less than or equal to 120. Preferably, the mesh number of the ventilation holes 11 is set to be greater than or equal to 80 and less than or equal to 100. In this way, both the filtration area of the formaldehyde filter net 100 can be ensured and the air resistance of the formaldehyde filter net 100 can be reduced.

[0101] Further, the hole depth of the ventilation holes 11 is greater than or equal to 3 mm and less than or equal to 50 mm.

[0102] It can be understood that if the hole depth of the ventilation holes 11 is smaller, the flow time of air in the ventilation holes 11 is less, and the filtration area of the formaldehyde filter net 100 is smaller; conversely, if the hole depth of the ventilation holes 11 is larger, the flow time of air in the ventilation holes 11 is more, and the filtration area of the formaldehyde filter net 100 is larger, but the air resistance of the formaldehyde filter net 100 is also larger.

[0103] It can be understood that if the depth of the ventilation hole 11 is too small, the filtering area of the formaldehyde filter net 100 will be too small, which will greatly reduce the filtering efficiency and purification effect. If the depth of the ventilation hole 11 is too large, the air resistance of the formaldehyde filter net 100 will be too large, which will greatly reduce the ventilation volume of the formaldehyde filter net 100, etc. Therefore, the depth of the ventilation hole 11 is set to be greater than or equal to 3 mm and less than or equal to 50 mm. More specifically, the depth of the ventilation hole 11 is greater than or equal to 5 mm and less than or equal to 30 mm. Preferably, the depth of the ventilation hole 11 is greater than or equal to 10 mm and less than or equal to 20 mm. In this way, both the filtering area of the formaldehyde filter net 100 can be ensured and the air resistance of the formaldehyde filter net 100 can be reduced.

[0104] The present invention also provides an air treatment device. As Figure 1 shown, the air treatment device 1000 includes a housing 200 and a formaldehyde filter net 100. The housing 200 has an air inlet, an air outlet 220, and an air treatment air duct connecting the air inlet and the air outlet 220. The formaldehyde filter net 100 is disposed at the air inlet; alternatively, the formaldehyde filter net 100 is disposed in the air treatment air duct; alternatively, the formaldehyde filter net 100 is disposed at the air outlet 220.

[0105] Specifically, for the specific structure of the formaldehyde filter net 100, refer to the above embodiments. Since the air treatment device 1000 of the present invention adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one.

[0106] Specifically, the air treatment device 1000 refers to a device that can adjust the temperature, humidity, cleanliness, etc. of the air, including but not limited to any one of a fan, an air machine, an air conditioner indoor unit, an air conditioner integrated machine, an air purifier, an air humidifier, etc. Among them, the air conditioner indoor unit includes but not limited to a floor-standing air conditioner indoor unit, a vertical hanging air conditioner indoor unit, and a wall-mounted air conditioner indoor unit.

[0107] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A formaldehyde filter, characterized in that, The formaldehyde filter screen includes a substrate having a plurality of ventilation holes extending in the thickness direction of the substrate. The formaldehyde filter screen further includes a catalytic layer provided on the surface of the pore wall of the ventilation holes. The ventilation holes include a reduced section, and the cross-sectional area of the reduced section increases or decreases in the thickness direction of the substrate, so as to increase the pore wall area of the ventilation holes corresponding to the reduced section and increase the setting amount of the corresponding catalytic layer; The cross-sectional area of the ventilation holes increases or decreases in the thickness direction of the substrate; The change trends of two adjacent ventilation holes are opposite, so that when the cross-sectional area of one of the ventilation holes decreases from one plate surface of the substrate to the other plate surface, the cross-sectional area of the adjacent other ventilation hole increases from one plate surface of the substrate to the other plate surface; A plurality of inner air passing through holes are provided on the pore wall of the ventilation holes, and the inner air passing through holes communicate two adjacent ventilation holes.

2. The formaldehyde filter screen according to claim 1, characterized in that, The ventilation holes have a larger opening end and a smaller opening end, and the opening area of the larger opening end and the opening area of the smaller opening end have a reduction ratio, and the reduction ratio is greater than 1 and less than or equal to 10.

3. The formaldehyde filter according to claim 2, wherein, The reduction ratio is greater than or equal to 1.5 and less than or equal to 8.

4. The formaldehyde filter according to any one of claims 1 to 3, characterized in that, The longitudinal section of the ventilation holes is two oblique lines or two arcs.

5. The formaldehyde filter according to any one of claims 1 to 3, characterized in that, The mesh number of the ventilation holes is greater than or equal to 30 and less than or equal to 150; and / or, The thickness of the substrate is greater than or equal to 3 mm and less than or equal to 50 mm.

6. An air treatment device, characterized in that, It includes a housing and the formaldehyde filter screen according to any one of claims 1 to 5. The housing has an air inlet, an air outlet, and an air treatment air duct provided between the air inlet and the air outlet. The formaldehyde filter screen is provided at the air inlet; or, the formaldehyde filter screen is provided in the air treatment air duct; or, the formaldehyde filter screen is provided at the air outlet.

7. The air treatment device according to claim 6, wherein The air treatment device is any one of a fan, an air conditioner, an indoor unit of an air conditioner, an integrated air conditioner, an air purifier, and an air humidifier.

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