Filter device for filtering formaldehyde

Abstract

The present invention discloses a filter device for filtering formaldehyde, comprising: a first filter layer, a second filter layer, a third filter layer and a mounting frame; the mounting frame is formed with a mounting opening; the first filter layer, the second filter layer and the third filter layer are all folded structures; the first filter layer, the second filter layer and the third filter layer are sequentially stacked and arranged at the mounting opening of the mounting frame; the first filter layer is fixedly mounted to the mounting frame; the second filter layer and the third filter layer are detachably connected to the mounting frame; and a plurality of ventilation holes are formed at the folded portion of the second filter layer. The filter device for filtering formaldehyde of the present invention is provided with ventilation holes for increasing the ventilation volume at the folded portion of the second filter layer, which can solve the problem of excessive wind resistance caused by excessive density of multiple superimposed filter layers at the folded position. The ventilation holes formed at the folded portion reduce the overall area of ​​the second filter layer, which plays a role in adjusting the flow of the filter layer and increasing the reaction time.

Description

Technical Field

[0001] The invention relates to a filtering device for filtering formaldehyde. Background Art

[0002] The existing formaldehyde removal filter structure is generally formed by folding multiple layers of filter screens and stacking them in series. After the multiple layers of filter screens are folded and stacked, there is a significant difference in density between the folded parts and the non-folded parts. Specifically, the spatial density of the folded parts is greater, which results in greater wind resistance at the folded parts, and the airflow is not smooth at the folded parts, resulting in blockage and other adverse consequences. Summary of the invention

[0003] The present invention provides a filtering device for filtering formaldehyde, which adopts the following technical solution:

[0004] A filtering device for filtering formaldehyde, comprising: a first filtering layer, a second filtering layer, a third filtering layer and a mounting frame;

[0005] The mounting frame is formed with a mounting opening;

[0006] The first filter layer, the second filter layer and the third filter layer are all folded structures;

[0007] The first filter layer, the second filter layer and the third filter layer are sequentially stacked on each other and arranged at the installation opening of the installation frame;

[0008] The first filter layer is fixedly mounted to the mounting frame;

[0009] The second filter layer and the third filter layer are removably connected to the mounting frame;

[0010] A plurality of ventilation holes are formed at the folded portion of the second filter layer.

[0011] Furthermore, the second filter layer is integrally formed.

[0012] Furthermore, the second filter layer comprises: a plurality of filter elements and a plurality of connectors for connecting the filter elements;

[0013] The filter element and the connecting element are rectangular;

[0014] A plurality of filter elements are arranged in parallel and at intervals and connected into a whole through a plurality of connecting elements;

[0015] The gap between two adjacent filter elements forms a ventilation hole.

[0016] Further, a plurality of filters are arranged along a first direction;

[0017] A plurality of connecting members are arranged along the second direction;

[0018] The first direction is perpendicular to the second direction.

[0019] Further, the connecting member is an adhesive tape;

[0020] The filter element is made of formaldehyde-removing melt-blown paper;

[0021] The first filter layer is made of PP shaped meltblown paper;

[0022] The third filter layer is made of electrostatically graded polar meltblown paper.

[0023] Furthermore, the first filter layer is made of PP shaped melt-blown paper;

[0024] The second filter layer is made of formaldehyde-removing melt-blown paper;

[0025] The third filter layer is made of electrostatically polarized meltblown paper.

[0026] Furthermore, a ratio of the sum of the lengths of the plurality of ventilation holes in the folding direction of the second filter layer to the total length of the second filter layer in the folding direction is in a range of greater than or equal to 0.2 and less than or equal to 0.95.

[0027] Further, the folding angle of the second filter layer is in the range of greater than or equal to 5° and less than or equal to 80°;

[0028] The ratio of the sum of the lengths of the plurality of ventilation holes in the folding direction of the second filter layer to the total length of the second filter layer in the folding direction is set as the gap degree;

[0029] The relationship between the gap and the folding angle is:

[0030] A=1-0.01*θ,

[0031] Among them, A is the gap degree and θ is the folding angle.

[0032] Furthermore, a ratio of the sum of the areas of the plurality of ventilation holes to the total area of ​​the second filter layer is in a range of greater than or equal to 0.05 and less than or equal to 0.2.

[0033] Further, the folding angle of the second filter layer is in the range of greater than or equal to 5° and less than or equal to 80°;

[0034] The ratio of the sum of the areas of the plurality of ventilation holes to the total area of ​​the second filter layer is set as the ventilation degree;

[0035] The relationship between ventilation and folding angle is:

[0036] B = 0.21-0.002*θ,

[0037] Among them, B is the ventilation degree and θ is the folding angle.

[0038] The invention is beneficial in that the filter device for filtering formaldehyde is provided with ventilation holes for increasing ventilation at the folded part of the second filter layer, which can solve the problem of excessive wind resistance caused by excessive density of the multi-layer superimposed filter layer at the folded position. At the same time, the ventilation holes formed at the folded part reduce the overall area of ​​the second filter layer, reduce the material cost of the second filter layer, and play a role in regulating the flow of the filter layer and increasing the reaction time. Control the room temperature catalytic oxidation reaction to fall within the high efficiency range.

[0039] The benefit of the present invention is that the filtering device for filtering formaldehyde also reveals the setting method of the ventilation holes and defines the relationship between the ventilation holes and the folding angle of the second filter layer, so that the ventilation hole design of the second filter layer is more reasonable and the structure of the second filter layer is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of a first embodiment of a filtering device for filtering formaldehyde according to the present invention;

[0041] Figure 2 is an enlarged view of a first embodiment of a filtering device for filtering formaldehyde according to the present invention;

[0042] Figure 3 It is a partial schematic diagram of the second filter layer of the second embodiment of the filter device for filtering formaldehyde of the present invention.

[0043] A filtering device 100 for filtering formaldehyde comprises a first filtering layer 10, a second filtering layer (20, 200), a ventilation hole 21, a third filtering layer 30, a mounting frame 40, a mounting port 41, a filtering element 201, a connecting element 202, and a ventilation hole 203. DETAILED DESCRIPTION

[0044] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Figure 1A filter device 100 for filtering formaldehyde includes: a first filter layer 10, a second filter layer 20, a third filter layer 30 and a mounting frame 40. The mounting frame 40 is used to install the first filter layer 10, the second filter layer 20, the third filter layer 30 and the mounting frame 40. The mounting frame 40 is rectangular, and a mounting opening 41 is formed in the middle of the rectangular mounting frame 40. The first filter layer 10, the second filter layer 20 and the third filter layer 30 are all folded structures. The first filter layer 10, the second filter layer 20 and the third filter layer 30 are sequentially stacked and arranged in the mounting opening 41 of the mounting frame 40. Among them, the first filter layer 10 is fixedly installed to the mounting frame 40. The second filter layer 20 and the third filter layer 30 are detachably connected to the mounting frame 40. When the filter device needs to be cleaned, the second filter layer 20 and the third filter layer 30 are removed and installed to the mounting frame 40 after cleaning.

[0046] A plurality of ventilation holes 21 are formed in the folded part of the second filter layer 20. It is understandable that the filter device 100 for filtering formaldehyde is formed by stacking a plurality of folded filter layers, and the density in the folded part is relatively high. Therefore, the wind resistance in the folded part is too large, resulting in poor air flow. In the embodiment, a plurality of ventilation holes 21 are provided in the folded part of the second filter layer 20, which improves the ventilation efficiency of the folded part and avoids blockage. At the same time, the ventilation holes 21 formed in the folded part reduce the overall area of ​​the second filter layer 20, thereby reducing the material cost of the second filter layer 20.

[0047] Among them, the first filter layer 10 is made of PP shaped meltblown paper. The second filter layer 20 is made of formaldehyde removal meltblown paper, which is mainly used to remove formaldehyde in the air. Specifically, in the present invention, the formaldehyde removal meltblown paper is a manganese dioxide-containing meltblown paper, which is formed by immersing the meltblown paper in a manganese dioxide solution for a certain period of time and then drying it. The third filter layer 30 is made of electrostatically charged polar meltblown paper.

[0048] As a preferred embodiment, the second filter layer 20 is integrally formed. The second filter layer 20 is formed by folding a whole sheet of filter paper, and the ventilation holes 21 are formed at the folded portion by cutting or the like.

[0049] In order to ensure that the ventilation holes 21 can meet the ventilation requirements, the ratio of the sum of the lengths of the plurality of ventilation holes 21 in the folding direction of the second filter layer 20 to the total length of the second filter layer 20 in the folding direction is in a range of greater than or equal to 0.2 and less than or equal to 0.95. The ratio of the sum of the lengths of the plurality of ventilation holes 21 in the folding direction of the second filter layer 20 to the total length of the second filter layer 20 in the folding direction is set as the gap degree. The larger the gap degree, the better the ventilation effect of the second filter layer 20 at the folded part.

[0050] It is understandable that the larger the folding angle of the second filter layer 20, the greater the sealing of the folded part, the greater the wind resistance, and the larger the gap of the ventilation hole 21 that needs to be set. The range of the folding angle of the second filter layer 20 is greater than or equal to 5° and less than or equal to 80°. (PS, the final angle selected is 5-80, and 3 to 80° is not selected. Because the angle is selected as 3°, the coefficient of the fitted formula is more complicated.) The setting of the gap size is inversely proportional to the value of the folding angle. Specifically, when the folding angle is 5°, the gap is 0.95, and when the folding angle is 80°, the gap is 0.2. According to this relationship, the relationship between the gap and the folding angle is fitted as follows:

[0051] A=1-0.01*θ,(1)

[0052] Among them, A is the gap degree and θ is the folding angle.

[0053] Considering from another perspective, the ratio of the sum of the areas of the ventilation holes 21 to the total area of ​​the second filter layer 20 ranges from greater than or equal to 0.05 to less than or equal to 0.2. The ratio of the sum of the areas of the ventilation holes 21 to the total area of ​​the second filter layer 20 is set as the ventilation degree. The larger the gap, the better the ventilation effect of the second filter layer 20 at the folded part. The folding angle of the second filter layer 20 ranges from greater than or equal to 5° to less than or equal to 80°, and the setting of the ventilation degree is inversely proportional to the value of the folding angle. Specifically, when the folding angle is 5°, the ventilation degree is 0.2, and when the folding angle is 80°, the gap is 0.05. The relationship between the ventilation degree and the folding angle is fitted according to this relationship:

[0054] B = 0.21 - 0.002 * θ, (2)

[0055] Among them, B is the ventilation degree and θ is the folding angle.

[0056] In the above embodiment, the second filter layer 20 is a single component formed integrally. Figure 3The second embodiment of the second filter layer in this scheme is shown, that is, the second filter layer 200. In this embodiment, the second filter layer 200 includes: a plurality of filter elements 201 and a plurality of connectors 202 for connecting the filter elements 201. Specifically, the filter elements 201 and the connectors 202 are rectangular. A plurality of filter elements 201 are arranged in parallel and at intervals and connected into a whole by a plurality of connectors 202. The gap between two adjacent filter elements 201 forms a vent 203. Furthermore, a plurality of filter elements 201 are arranged along a first direction. A plurality of connectors 202 are arranged along a second direction. The first direction is perpendicular to the second direction. In this embodiment, the connector 202 is a tape. The filter element 201 is made of formaldehyde removal meltblown paper, specifically, the formaldehyde removal meltblown paper is a manganese dioxide-containing meltblown paper, which is formed by dipping the meltblown paper into a manganese dioxide solution for a certain period of time and then drying it. Among them, the setting method of the size of the vent 203 is the same as that of the previous embodiment, and no further description is given.

[0057] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A filtering device for filtering formaldehyde, comprising: A first filter layer, a second filter layer, a third filter layer and a mounting frame; The mounting frame is formed with a mounting opening; The first filter layer, the second filter layer and the third filter layer are all folded structures; The first filter layer, the second filter layer and the third filter layer are sequentially stacked on each other and arranged at the installation opening of the installation frame; It is characterized in that The first filter layer is fixedly mounted to the mounting frame; The second filter layer and the third filter layer are detachably connected to the mounting frame; A plurality of ventilation holes are formed at the folded portion of the second filter layer; The second filter layer comprises: a plurality of filter elements and a plurality of connecting elements for connecting the filter elements; The filter element and the connecting element are rectangular; A plurality of the filter elements are arranged in parallel and at intervals and connected into a whole through a plurality of the connecting elements; The gap between two adjacent filter elements forms the ventilation hole; A plurality of the filter elements are arranged along a first direction; A plurality of the connecting members are arranged along the second direction; The first direction is perpendicular to the second direction; The connecting piece is an adhesive tape; The filter element is made of formaldehyde-removing melt-blown paper; The first filter layer is made of PP shaped melt-blown paper; The third filter layer is made of electrostatically charged polar melt-blown paper; The second filter layer is integrally formed; The ratio of the sum of the lengths of the plurality of ventilation holes in the folding direction of the second filter layer to the total length of the second filter layer in the folding direction is in a range of greater than or equal to 0.2 and less than or equal to 0.95; The folding angle of the second filter layer is in the range of greater than or equal to 5° and less than or equal to 80°; The ratio of the sum of the lengths of the plurality of ventilation holes in the folding direction of the second filter layer to the total length of the second filter layer in the folding direction is set as the gap degree; The relationship between the gap and the folding angle is: A=1-0.01*θ, Wherein A is the gap degree, and θ is the folding angle.

2. The filtering device for filtering formaldehyde according to claim 1, characterized in that: The ratio of the sum of the areas of the plurality of ventilation holes to the total area of ​​the second filter layer is in a range of greater than or equal to 0.05 and less than or equal to 0.

2.

3. The filtering device for filtering formaldehyde according to claim 2, characterized in that: The folding angle of the second filter layer is in the range of greater than or equal to 5° and less than or equal to 80°; The ratio of the sum of the areas of the plurality of ventilation holes to the total area of ​​the second filter layer is set as the ventilation degree; The relationship between the ventilation degree and the folding angle is: B=0.21-0.002*θ, Wherein B is the ventilation degree, and θ is the folding angle.

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