Thin plate type filter
By designing a filter adsorption layer composed of activated carbon with particle size of 1 mm to 8 mm and covering it between thin cloth layers, the existing filters have been solved, and the high adsorption volume has been achieved , low pressure loss and long lifespan effects.
Patent Information
- Application Number
- CN202420967405.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2034-05-07
AI Technical Summary
When removing volatile organic compounds such as toluene, existing filters have low efficiency, high cost, poor effect, and short service life, resulting in low recovery and high material loss rate.
A thin plate filter is designed, which includes a filter adsorption layer composed of activated carbon of 1 mm to 8 mm particle size. The activated carbon is coated between thin cloth layers in the accommodating space to reduce wind resistance and increase adsorption amount.
The effect of high adsorption volume and low pressure loss is achieved, the life span increases by more than 30%, and the pressure loss is reduced by more than 20%.
Smart Images
Figure CN222468402U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a thin plate filter, in particular to an air purification device with high adsorption capacity and low pressure loss. Background Art
[0002] First, in the field of semiconductor manufacturing, in order to further improve product yield, clean rooms are widely used to manufacture products in a clean, pollution-free, isolated environment. In the previous technology, if the environmental requirements of the clean room are to be met, a fan filter unit (FFU) is usually installed on the ceiling of the clean room, and a make-up air unit (MAU) filter device is installed at the air inlet, so that the air flow is driven by the fan through the filter screen of the filter device and then enters the clean room, so as to reduce the micro-pollutants (AMC: Airborne Molecular Contamination) in the external air intake or the air inside the clean room, such as sulfur-containing substances, acidic substances, alkaline substances, or volatile organic compounds (VOCs).
[0003] The filter device installed at the air inlet of a clean room or air conditioning equipment, such as the one mentioned above, mainly comprises several filter units filled with a single or multiple filter materials, which are respectively installed in a container that can support the several filter units, so that the above-mentioned gas passes through each filter unit layer by layer to achieve the purpose of air filtration.
[0004] Among them, toluene (C7H 8) It is an organic compound, an aromatic hydrocarbon, with a molecular formula of C6H5CH3. Toluene is liquid at room temperature, colorless and flammable. Its boiling point is 110.8°C, its freezing point is -95°C, and its density is 0.866 g / cm3. Its freezing point is lower than that of water, and its boiling point is higher than that of water. Toluene is insoluble in water, but soluble in ethanol and benzene solvents. Toluene vapor is toxic and can cause harm to the human body through the respiratory tract. It should be prevented from entering the respiratory organs during use and production. However, existing methods for removing toluene have shortcomings such as low efficiency, high cost, and poor effect.
[0005] like Figure 1 As shown in the figure, it discloses a conventional filter unit 70, which has a filter screen 72 in a frame 71. Since activated carbon is a porous carbon-containing substance, it has a highly developed pore structure, resulting in the characteristics of high microporous volume and high surface area of activated carbon. Therefore, it is widely used to make application products of activated carbon filter screens. Figure 1 The activated carbon filter 72 shown, or other activated carbon filters such as coated activated carbon filters, V-shaped chemical filters, honeycomb activated carbon filters, etc.
[0006] In addition, although the existing filter 72 is coated with adsorbent materials such as activated carbon to adsorb volatile organic compounds (VOCs) such as toluene, most of these activated carbons are in the form of fine powder particles with a particle size of approximately 0.2 to 0.8 mm, which will have a large wind resistance, and it is necessary to mix glue or fiber into the activated carbon to melt and solidify it between the upper and lower filter cloths to form a filter cloth structure that is usually less than 5 mm thick. The filter cloth is then folded into a wavy shape and placed in a housing (into a frame) to form the existing filter 72. Furthermore, the adsorbent materials such as activated carbon will be covered by fibers or glue on their surface holes, so that the airflow cannot reach the developed holes inside the activated carbon, resulting in a reduced adsorption capacity and a poor service life.
[0007] Therefore, how to effectively overcome the shortcomings of the existing filter screen, such as low recovery rate, high cost and poor effect, and how to increase the service life and reduce the material loss rate, are the issues to be solved by the utility model. Utility Model Content
[0008] The main technical problem to be solved by the utility model is to overcome the above-mentioned defects of the prior art and provide a thin plate filter, which has a thin volume but high adsorption capacity and low pressure loss, and can increase the service life by more than 30%; it has the effect of reducing the pressure loss by at least 20%.
[0009] The technical solution adopted by the utility model to solve its technical problems is:
[0010] A thin plate filter comprises: a box body, a first grid is provided on the bottom side, and a second grid is provided on the top side, so that a accommodating space with a height of 20mm to 40mm is formed between the first and second grids; a first thin cloth layer is attached to the inner edge surface of the first grid and is supported and positioned by the first grid; a second thin cloth layer is attached to the inner edge surface of the second grid and is supported and positioned by the second grid; a filtering adsorption layer is composed of a plurality of activated carbons, each of which has a particle size of 1mm to 8mm, which are installed in the accommodating space and are evenly filled between the first thin cloth layer and the second thin cloth layer; and the pores of the first and second thin cloth layers are smaller than the particle size of the activated carbon, so that the activated carbon is coated in the accommodating space and will not leak out; the above components are combined to form a thin plate filter, so that when the wind speed on the air flow channel surface is less than 0.4m / s, its pressure loss is less than 200Pa.
[0011] According to the above characteristics, the activated carbon is in the shape of granules or columns.
[0012] According to the above characteristics, the activated carbon is granular, and its length and width are 2mm to 8mm.
[0013] According to the above characteristics, the activated carbon is columnar and its diameter is 1 mm to 5 mm.
[0014] According to the aforementioned features, the box body is composed of a lower frame body and an upper frame body which are connected by welding, screw rivet locking, or mutual locking through a plurality of joint components.
[0015] According to the above-mentioned features, the first and second grids are respectively formed integrally with the upper frame and the lower frame, or are formed first and then combined with the lower frame and the upper frame.
[0016] According to the above-mentioned features, the first and second thin fabric layers include fiber fabrics and non-woven fabrics.
[0017] According to the above-mentioned features, the side of the box body also includes a filling port and a sealing cover. The activated carbon of the filter adsorption layer is loaded into the accommodating space through the filling port and is sealed by the sealing cover so that the activated carbon is installed in the accommodating space.
[0018] According to the above-mentioned features, the activated carbon of the filter adsorption layer is pre-installed in a bag body formed by combining the first and second thin cloth layers. Before the lower frame and the upper frame of the box body are combined, the bag body is placed between the upper and lower frames, and then the upper and lower frames are combined so that the first and second thin cloth layers are also attached to the inner edge surfaces of the upper and lower frames respectively, and the activated carbon is installed in the accommodating space.
[0019] With the help of the above technical means, the utility model has the following effects that need to be explained:
[0020] The filter adsorption layer of the utility model is entirely composed of stacked activated carbon, which is different from the traditional adsorption material that is glued or fiber melted and solidified between the upper and lower filter cloths. In addition, the particle size of the activated carbon makes it have lower wind resistance, thereby achieving the effects of high filter material filling, high adsorption capacity and long service life.
[0021] The filter adsorption layer of the utility model has a thickness of about 20mm to 40mm, and the particle size of the activated carbon is 1mm to 8mm. When the waste gas such as toluene passes through at a certain speed, the toluene gas therein is adsorbed and retained by the activated carbon, and the purified air is discharged to the outside. After being adsorbed by the activated carbon, the toluene content in the waste gas can be reduced to less than 10%.
[0022] The thin plate filter of the utility model has a pressure loss of less than 200 Pa when the wind speed on the air flow channel surface is less than 0.4 m / s, and has a low pressure loss effect.
[0023] The beneficial effects of the utility model are that it has a thin volume but a high adsorption capacity and low pressure loss, and can increase the service life by more than 30%; it has the effect of reducing the pressure loss by at least 20%. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0025] Figure 1 The invention is a structural schematic diagram of an existing plate-type filter unit.
[0026] Figure 2 It is an exploded perspective view of the first feasible embodiment of the utility model.
[0027] Figure 3A It is a partially exploded stereogram of the first feasible embodiment of the utility model.
[0028] Figure 3B It is a combined stereogram of the first feasible embodiment of the utility model.
[0029] Figure 4A It is a partially exploded perspective view of a second feasible embodiment of the utility model.
[0030] Figure 4B It is a combined stereogram of the second feasible embodiment of the utility model.
[0031] Figure 5 It is a cross-sectional view of a feasible embodiment of the utility model.
[0032] Fig. 6A It is a schematic diagram showing that the activated carbon of the utility model is in granular form.
[0033] Figure 6B It is a schematic diagram showing that the activated carbon of the utility model is in a columnar shape.
[0034] Fig. 7A is a schematic diagram showing hot gas flow through granular activated carbon.
[0035] Figure 7B is a schematic diagram showing hot gas flow through a column of activated carbon.
[0036] Description of the numbers in the figure:
[0037] 10 Box
[0038] 10a lower frame
[0039] 10b Upper frame
[0040] 10c Storage space
[0041] 11 First Grid
[0042] 12 Second Grid
[0043] 13 Filling port
[0044] 14 Capping
[0045] 15. Joining components
[0046] 20 First thin fabric layer
[0047] 30 Second thin fabric layer
[0048] 40 Filter adsorption layer
[0049] 41 Activated carbon
[0050] 40a Bag body
[0051] 41a Granular
[0052] 41b Columnar
[0053] 50 Thin plate filter DETAILED DESCRIPTION
[0054] The following is a description of the implementation of the present invention by means of specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied by means of other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.
[0055] First, see Figures 2 to 7B As shown, it is a preferred embodiment of the thin plate filter 50 of the utility model, which includes: a box body 10, a first grid 11 is provided on the bottom side, and a second grid 12 is provided on the top side, so that a accommodating space 10c with a height (H) of 20mm to 40mm is formed between the first and second grids 11 and 12, and the side of the box body 10 is provided with at least a filling port 13 and a cover 14; In this embodiment, the mesh shape of the grid structure of the box body 10 is composed of one or a combination of a circle, a square, a rectangle, a rhombus, a triangle and other polygons. And the first and second grids 11 and 12 are respectively integrally formed with the lower frame 10a and the upper frame 10b, or are first formed and then combined with the lower frame 10a and the upper frame 10b, which can be implemented.
[0056] like Figures 2 to 3B As shown, in the first embodiment, the box body 10 includes a lower frame body 10a and an upper frame body 10b which are connected by a plurality of joint components 15, or by welding, or by screw rivet locking, or by mutual engagement. The joint component 15 can be, for example, a screw or other component, but is not limited thereto. The box body 10 can also be formed in one piece, and both are feasible.
[0057] The filter adsorption layer 40 is composed of a plurality of activated carbons 41, each of which has a particle size of 1 mm to 8 mm. The activated carbons 41 are loaded into the accommodating space 10c through the filling port 13 and sealed by the cover 14. In this embodiment, the activated carbons 41 are in the shape of granules 41a or columns 41b. Fig. 6A As shown, the activated carbon 41 is in the form of granules 41a, and its length and width (LxW) are 2 mm to 8 mm. Figure 6B As shown, the activated carbon 41 may also be columnar 41b with a diameter of 1 mm to 5 mm. The particle size of the activated carbon 41 is one of the important factors in the present invention, so the particle size is preferably between 1 mm and 8 mm according to its shape, so that it has a high surface area and low wind resistance adsorption characteristics.
[0058] Please come back Figure 2 to Figure 5 As shown, the first thin cloth layer 20 is attached to the inner edge surface of the first grid 11 and is supported and positioned by the first grid 11; the second thin cloth layer 30 is attached to the inner edge surface of the second grid 12 and is supported and positioned by the second grid 12; the pores of the first and second thin cloth layers 20 and 30 are smaller than the particle size of the activated carbon 41, so that the activated carbon 41 is coated in the accommodating space 10c without leaking out.
[0059] In this embodiment, the first and second thin cloth layers 20, 30 include fiber cloth or non-woven fabric, but are not limited thereto. Their main function is to prevent the activated carbon 41 from falling out, which is somewhat different from the traditional filter net or filter cloth that mainly functions to absorb pollutants, so their thickness and structure are also somewhat different. The utility model mainly uses the activated carbon 41 loaded in the thin plate filter 50 to absorb low-concentration volatile organic compounds, such as toluene (C7H8), but is not limited thereto.
[0060] like Figures 4A to 4B As shown, in the second embodiment, the activated carbon 41 of the filter adsorption layer 40 is pre-installed in the bag body 40a formed by combining the first and second thin cloth layers 20 and 30. Before the lower frame body 10a and the upper frame body 10b of the box body 10 are combined, the bag body 40a is placed between the upper and lower frames 10b and 10a, and then the upper and lower frames 10b and 10a are combined, so that the first and second thin cloth layers 20 and 30 of the bag body 40a are also respectively attached to the surfaces of the upper and lower frames 10b and 10a, and the adsorbent 41 is installed in the accommodating space 10c.
[0061] The pressure loss test method of the thin plate filter 50 of the utility model is as follows. It is carried out in a channel with the same cross-sectional area and a certain length to stabilize the flow rate of the test airflow. The surface velocity is controlled by a flow meter at the air inlet end. The activated carbon 41 with a particle size of 2mm to 5mm is used. When the surface velocity is 0.1 to 0.4m / s, the following data are measured:
[0062] Average surface velocity (m / s) Average pressure loss (Pa) Measuring pressure loss range 0.0 0.0 0.0～0.1 0.1 47 45～49 0.2 88 86～90 0.3 124 122～126 0.4 173 170～176
[0063] Therefore, according to the test results of the utility model, when the face wind speed is 0.4m / s, the pressure loss does not exceed 200Pa. Compared with the pressure loss of the existing filter, it is at least reduced by more than 20%.
[0064] Further, the saturated adsorption capacity test of the thin plate filter 50 of the utility model is as follows:
[0065] Test gas species <![CDATA[Toluene (C7H8)]]> Test concentration value 18.42ppm Filter surface wind speed 0.3m / sec (test system wind 6.48CMM; surface wind speed is calculated based on the filter cross section of 600mm×600mm) Capacity test end point The removal efficiency dropped to 77.0% (test time was 1440 minutes) Concentration interval 1min Total adsorption value 385.18g / filter (total adsorption capacity when the initial removal efficiency is tested from 99.7% to 95.0%) Total adsorption value 483.82g / filter (total adsorption capacity from the initial removal efficiency of 99.7% to 90.0%) Total adsorption value 550.83g / filter (total adsorption capacity when the initial removal efficiency is tested from 99.7% to 85.0%) Total adsorption value 594.27g / filter (total adsorption capacity from the initial removal efficiency of 99.7% to 80.0%)
[0066] From the above saturated adsorption capacity experimental results, it is known that the adsorption capacity: when the removal efficiency drops to 80%, the adsorption capacity>500g; therefore, the high adsorption capacity of toluene (C7H8) by the thin plate filter 50 of the utility model has substantial benefits.
[0067] With the help of the above technical means, the utility model has the following effects that need to be explained:
[0068] 1. The filter adsorption layer 40 of the present invention is entirely composed of stacked activated carbon 41, which is different from the traditional adsorption material that is glue or fiber melted and solidified between the upper and lower filter cloths. In addition, the particle size of the activated carbon 41 makes it have a lower wind resistance, thereby achieving the effects of high filter material filling, high adsorption capacity and long service life.
[0069] 2. The filter adsorption layer 40 of the utility model has a thickness of about 20mm to 40mm. When the waste gas such as toluene passes through at a certain speed, the toluene gas therein is adsorbed and retained by the activated carbon 41, and the purified air is discharged to the outside. After the toluene content of the waste gas G is adsorbed by the activated carbon 41, the toluene content can be reduced to less than 10%.
[0070] 3. The thin plate filter 50 of the present invention has a pressure loss of less than 200 Pa when the wind speed on the air flow channel surface is less than 0.4 m / s, and indeed has the effect of low pressure loss.
[0071] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A thin plate filter, characterized in that: include: The box body has a first grid on its bottom side and a second grid on its top side, so that a containing space with a height of 20 mm to 40 mm is formed between the first and second grids; A first thin cloth layer, abutting against the inner edge surface of the first grid and supported and positioned by the first grid; A second thin cloth layer is attached to the inner edge of the second grid and is supported and positioned by the second grid; The filter adsorption layer is composed of a plurality of activated carbons, each of which has a particle size of 1 mm to 8 mm, and is installed in the accommodation space and evenly fills the space between the first thin cloth layer and the second thin cloth layer; and The pores of the first and second thin fabric layers are smaller than the particle size of the activated carbon, so that the activated carbon is encapsulated in the accommodating space without leaking out; The box body, the first thin cloth layer, the second thin cloth layer and the filter adsorption layer are combined to form a thin plate filter, so that when the wind speed on the air flow channel surface is less than 0.4m / s, the pressure loss is less than 200Pa.
2. The thin plate filter according to claim 1, characterized in that: The activated carbon is in the shape of granules or columns.
3. The thin plate filter according to claim 2, characterized in that: The activated carbon is in granular form, and its length and width are 2mm to 8mm.
4. The thin plate filter according to claim 2, characterized in that: The activated carbon is columnar, and its diameter is 1 mm to 5 mm.
5. The thin plate filter according to claim 1, characterized in that: The box body is composed of a lower frame body and an upper frame body which are connected by welding, mutual clamping, or screw rivet locking through a plurality of joint components.
6. The thin plate filter according to claim 5, characterized in that: The first and second grids are respectively formed integrally with the upper frame and the lower frame, or are formed first and then combined with the lower frame and the upper frame.
7. The thin plate filter according to claim 1, characterized in that: The first and second thin fabric layers include fiber fabric and non-woven fabric.
8. The thin plate filter according to claim 1, characterized in that: The side of the box body also includes a filling port and a sealing cover. The activated carbon of the filter adsorption layer is loaded into the accommodating space through the filling port and is sealed by the sealing cover, so that the activated carbon is installed in the accommodating space.
9. The thin plate filter according to claim 1, characterized in that: The activated carbon of the filter adsorption layer is pre-installed in a bag body formed by combining the first and second thin cloth layers. Before the lower frame and the upper frame of the box body are combined, the bag body is placed between the upper and lower frames, and then the upper and lower frames are combined so that the first and second thin cloth layers are also attached to the inner edge surfaces of the upper and lower frames respectively, and the activated carbon is installed in the accommodating space.