CABIN FILTER UNIT

Abstract

The present invention relates to a cabin filter unit, and may comprise: a HEPA filter; and carbon block filters placed at the rear end of the HEPA filter, wherein each of the carbon block filters has a structure which has multiple perforations formed and distributed throughout the entire area thereof for the flow of air, and is formed to satisfy the perforation ratio of 30-50% with reference to 07-10, two or more carbon block filters being stacked, and disposed to be in close contact with each other or spaced apart from each other.

Claims

1. A cabin filter unit comprising: a HEPA filter; and a carbon block filter placed at the rear end of the HEPA filter.

2. The cabin filter unit of claim 1, further comprising a non-woven fabric placed at the rear end the carbon block filter.

3. The cabin filter unit of claim 1, wherein the carbon block filter has a structure which has several perforations formed and distributed throughout the entire area thereof for flow or air, and satisfies a perforation ratio of 30 to 50% with reference to Ø7 to 10.

4. The cabin filter unit of claim 3, wherein one carbon block filter is used, or two or more carbon block filters are stacked, and when two or more carbon block filters are stacked, they can be in close contact with each other or can be spaced apart from each other.

5. The cabin filter unit of claim 4, wherein when two or more carbon block filters are stacked, the carbon block filters are stacked up and down such that perforations corresponding to each other of the carbon block filters not entirely but partially communicate with each other so that air stays longer and the performance of adsorbing harmful gas can be increased.

6. The cabin filter unit of claim 1, wherein the carbon block filter is manufactured through steps of: mixing activated carbon and a polymer binder at a weight ratio of 10:1.5 to 2; putting the mixture of the activated carbon and the polymer binder into a mold and performing heat treatment on the compound at temperature of 210° C. to 250° C. and pressure of 5 Kgf/cm.sup.2 to 10 Kgf/cm.sup.2 for 5 to 15 minutes, thereby forming a block; and cooling in the mold for 20 minutes in the air, wherein the activated carbon is coconut activated carbon and has a granular size that passes a 30×60 mesh or a 20×45 mesh; and the polymer binder is ultrahigh molecular weight polyethylene (UHMWPE).

7. The cabin filter unit of claim 1, wherein a HEPA filter of H11 or higher is used for the HEPA filter to satisfy the collection ratio of 95% or more with reference to 0.3 μm particles.

8. A method of manufacturing a cabin filter that manufactures a carbon block filter by performing a post-processing treatment to increase efficiency of adsorbing harmful gas by giving impregnation performance, the method comprising: performing primary impregnation for 15 to 30 minutes after putting a carbon block filter into a mixed solution of DI water and phosphoric acid (H.sub.3PO.sub.4) of 15%; performing primary drying on the carbon block filter impregnated in the solution mixed with phosphoric acid; performing secondary impregnation for 20 to 30 minutes after putting the carbon block filter, which has undergone the primary drying, into a mixed solution of DI water, KI of 3%, and KOH of 20%; and performing secondary drying on the carbon block filter impregnated in the solution mixed with KI and KOH.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0033] FIG. 1 is a perspective view showing a cabin filter unit according to an embodiment of the present invention.

[0034] FIG. 2 is an exploded perspective view showing the cabin filter unit according to an embodiment of the present invention.

[0035] FIG. 3 is a cross-sectional view showing the cabin filter unit according to an embodiment of the present invention.

[0036] FIG. 4 is an exemplary view showing the state when one carbon block filter is applied to the cabin filter unit according to an embodiment of the present invention.

[0037] FIG. 5 is a perspective view showing an array of two carbon block filters in the cabin filter unit according to an embodiment of the present invention.

[0038] FIG. 6 is an exemplary cross-sectional view showing an array of two carbon block filters in the cabin filter unit according to an embodiment of the present invention.

[0039] FIG. 7 shows simulation data showing a flow or air analysis result using a CFD program on the cabin filter unit according to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

[0040] Hereinafter, exemplary embodiments of the present invention are described in detail with reference to the accompanying drawings.

[0041] Terminologies used in the present invention are terminologies defined in consideration of functions in the present invention and may depend on users, the intention of an operator, or customs, so the definition of the terminologies should be construed as meanings and concepts corresponding to the technical matters of the present invention.

[0042] FIGS. 1 to 7 of the accompanying drawings are figures for illustrating a cabin filter unit according to the present invention.

[0043] A cabin filter unit 100 according to an embodiment of the present invention, as shown in FIGS. 1 to 6, includes a HEPA filter 120 and a carbon block filter 130 that are attached inside an edge-type paper mockup 110 having a frame structure and are placed at the front and rear.

[0044] The cabin filter unit 100 may further include a non-woven fabric 140 placed at the rear end of the carbon block filter 130.

[0045] The HEPA filter 120, which is placed at the front end to collect particulate contaminants including microdust or virus contained in the external air, is provided to block and prevent particulate contaminants from entering inward.

[0046] The HEPA filter 120 has a structure similar to a net and has a function of passing air and blocking particulate contaminants, and is formed by compressing a glass fiber. The performance of the HEPA filter 120 can be controlled by adjusting the diameter of the glass fiber or the filter thickness.

[0047] The HEPA filter 120 is manufactured in a corrugated structure so that the surface for collecting particulate contaminants can be increased, and is usually provided to increase the efficiency of removing microdust.

[0048] It is preferable that a HEPA filter of H11 or higher is employed and used for the HEPA filter 120 to satisfy the collection ratio of 95% or more with reference to 0.3 μm particles.

[0049] That is, the HEPA filter 120 is provided to achieve the main function for blocking microdust in terms of the use.

[0050] The carbon block filter 130 is attached inside the paper mockup 110 and placed at the rear end of the HEPA filter 120 to adsorb and remove various harmful gases such as nitrogen dioxide (NO.sub.2), ammonia (NH.sub.3), sulfur dioxide (SO.sub.2), and toluene contained in the external air.

[0051] The carbon block filter 130 also performs a deodorization function of removing smell from various harmful gases.

[0052] The carbon block filter 130 has a structure which has multiple perforations 131 formed and distributed throughout the entire area thereof to enable smooth flow of air.

[0053] The perforations 131 may be formed in various shapes such as a circle, a rectangle, or a hexagon, and it is preferable that the size of the perforations is about 07 to 10 to satisfy a perforation ratio of 30 to 50% with reference to the size of 07 to 10.

[0054] One carbon block filter 130 may be provided, as shown in FIG. 4, or two carbon block filters 130 may be stacked, as shown in FIG. 5.

[0055] A configuration of two or more carbon block filters 130 being stacked may also be possible.

[0056] When two or more carbon block filters 130 are stacked, as shown in FIG. 6, they may be disposed in close contact with each other or may be spaced apart from each other.

[0057] When two or more carbon block filters 130 are stacked, it may be preferable that the carbon block filters 130 are stacked up and down such that perforations 131 corresponding to each other of the carbon block filters 130 not entirely but partially communicate with each other.

[0058] Accordingly, the air passing through the cabin filter unit 100 stays longer in the carbon block filters 130, thereby being able to provide the advantage that it is possible to increase the adsorption performance and removal efficiency.

[0059] The carbon block filter 130 may be manufactured through the following manufacturing process to increase the efficiency of removing harmful gases.

[0060] To this end, activated carbon and a polymer binder are mixed at a weight ratio of 10:1.5 to 2.

[0061] It is preferable that the activated carbon is coconut activated carbon, and more preferably, the activated carbon may have a granular size that can pass a 30×60 mesh or a 20×45 mesh.

[0062] It is preferable that the polymer binder is ultrahigh molecular weight polyethylene (UHMWPE).

[0063] The coconut activated carbon has a characteristic of a large specific surface area (pores) and an excellent adsorption ability, so it can provide an advantage in that it is very advantageous in removing harmful gases.

[0064] For example, it is possible to maintain 1100 to 1400 m.sup.2/g for the specific surface area and show performance of 1100 to 1300 mg/g for iodine adsorption ability.

[0065] The mixture of the activated carbon and the polymer binder is put into a mold and then thermally treated, whereby a block is formed.

[0066] The forming condition in the mold may be temperature of 210° C. to 250° C., pressing pressure of 5 Kgf/cm.sup.2 to 10 Kgf/cm.sup.2, and time of 5 to 15 minutes.

[0067] The mixture in the mold may be cooled in the air for 20 minutes to manufacture the block.

[0068] Post-processing treatment may be performed as follows to increase the performance of adsorbing harmful gases by giving adhesion performance to the carbon block filter 130.

[0069] To this end, a mixed solution of DI water and phosphoric acid (H.sub.3PO.sub.4) of 15% is prepared, is put into the carbon block filter, and then undergoes primary impregnation for 15 to 30 minutes.

[0070] The DI water may be deionized water or ultrapure distilled water.

[0071] In the primary impregnation, about 15 to 20 minutes is preferable when one carbon block filter is impregnated, and about 20 to 30 minutes is preferable when two carbon block filter is impregnated.

[0072] Primary drying is performed on the carbon block filter impregnated in the solution mixed with phosphoric acid.

[0073] A dry oven may be used for the drying. About 20 to 30 minutes is preferable when one carbon block filter is dried, and about 2 to 3 hours is preferable when two carbon block filters are dried.

[0074] The carbon block that has undergone the primary drying is put into a mixed solution of DI water, KI of 3%, and KOH of 20% and then secondary impregnation is performed for 20 to 30 minutes.

[0075] The DI water may be deionized water or distilled water.

[0076] In the secondary impregnation, KI and KOH are not used together and may be separately used.

[0077] Secondary drying is performed on the carbon block filter impregnated in the solution mixed with KI and KOH.

[0078] A dry oven may also be used for the drying in this case. 2 to 3 hours is preferable for both when one carbon block filter is dried and when two carbon block filters are dried.

[0079] The non-woven fabric 140 is placed at the rear end of the carbon block filter 130.

[0080] The non-woven fabric 140 is fabricated in a felt type by arranging fibers in a parallel or indefinite direction without a weaving process and then combining the fibers using a synthetic resin adhesive to exhibit a filtering function.

[0081] For the post-processing treatment for giving impregnation performance to the carbon block filter 130, the efficiency of adsorbing and removing harmful gas was tested and the result is shown in the following Tables 1 to 4.

[0082] The harmful gas test was performed for each of three cases of “one carbon block filter”, “two carbon block filters”, and “two carbon block filters+non-woven fabric”, in which four kinds of harmful gases of nitrogen dioxide (NO.sub.2), ammonia (NH.sub.3), sulfur dioxide (SO.sub.2), and toluene were used.

TABLE-US-00001 TABLE 1 Inlet (Initial concen- Time (min) Item tration) 5 min 10 min 20 min 30 min Remark One 30 ppm 25 ppm 16 ppm  8 ppm 3 ppm Target gas carbon (90%) (Test gas) block NH3 Two 30 ppm 20 ppm 9 ppm 3 ppm 0.5 ppm carbon (99%) blocks Non- 30 ppm 20 ppm 8 ppm 4 ppm 0.5 ppm woven (99%) fabric + two carbon blocks

TABLE-US-00002 TABLE 2 Inlet (Initial concen- Time (min) Item tration) 5 min 10 min 20 min 30 min Remark One 50 ppm 35 ppm 16 ppm  8 ppm 5 ppm Target carbon (90%) gas block (Test Two 50 ppm 20 ppm 9 ppm 5 ppm 0.5 ppm gas) carbon (99%) Toluene blocks Non- 50 ppm 19 ppm 8 ppm 3.5 ppm   0.4 ppm woven (99.2%↑) fabric + two carbon blocks

TABLE-US-00003 TABLE 3 Inlet (Initial concen- Time (min) Item tration) 5 min 10 min 20 min 30 min Remark One 40 ppm 30 ppm 22 ppm 14 ppm  8 ppm Target gas carbon (90%) (Test gas) block SO2 Two 40 ppm 24 ppm 12 ppm 7 ppm 1 ppm carbon (99%) blocks Non- 40 ppm 22 ppm 11 ppm 6 ppm 0.5 ppm woven (99%) fabric + two carbon blocks

TABLE-US-00004 TABLE 4 Inlet (Initial concen- Time (min) Item tration) 5 min 10 min 20 min 30 min Remark One 20 ppm 17 ppm 12 ppm  6 ppm 2 ppm Target gas carbon (90%) (Test gas) block NO2 Two 20 ppm 12 ppm 7 ppm 3 ppm 0.4 ppm carbon (96%) blocks Non- 20 ppm 12 ppm 7 ppm 2.5 ppm   0.4 ppm woven (96%) fabric + two carbon blocks

[0083] As in the harmful gas test result shown in Tables 1 and 2, it can be seen that the adsorption and removal rate gradually increase over time for four kinds of harmful gases of nitrogen dioxide (NO.sub.2), ammonia (NH.sub.3), sulfur dioxide (SO.sub.2), and toluene through a post-processing treatment for giving the impregnation performance in the present invention.

[0084] The result shows that the adsorption and removal rate is high for the four kinds of harmful gases of nitrogen dioxide (NO.sub.2), ammonia (NH.sub.3), sulfur dioxide (SO.sub.2), and toluene when two carbon block filters are used, as compared to when one carbon block filter is used.

[0085] FIG. 7 shows simulation data showing a flow of air analysis result using a CFD (Computational Fluid Dynamics) program on the cabin filter unit 100 of the present invention, that is, it shows a simulation result when two carbon block filters are disposed behind a HEPA filter.

[0086] In this case, the inflow flux of flow of air was 0.4 m/sec.

[0087] In (a) of FIG. 7, the left data show flow of air seen from the front and the right data show flow of air seen from the rear.

[0088] In (b) of FIG. 7, the left data show flow of air seen from the side and the right data show flow of air seen from the top.

[0089] As in the simulation data shown in FIG. 7, in the present invention, it is seen that the flow of air is relatively uniformly maintained throughout the entire area and smooth flow of air is possible.

[0090] Therefore, according to the cabin filter unit 100 having the configuration described above in accordance with the present invention, since a HEPA filter and a carbon block filter are assembled to be placed at the front and rear, there is an advantage that it is possible to simultaneously remove all of microdust, yellow dust, and various gases including sooty smoke, it is possible to achieve an excellent ability to collect and adsorb microdust and harmful gases, and it is possible to provide smooth flow of air.

[0091] The embodiments described above are only preferable embodiments of the present invention, and the present invention is not limited to the embodiments. The present invention may be changed and modified and steps may be replaced in various ways by those skilled in the art within the spirit and claims of the present invention and those are included in the scope of the present invention.

REFERENCE SIGNS LIST

[0092] 100: Cabin filter unit [0093] 110: Paper mockup [0094] 120: HEPA filter [0095] 130: Carbon block filter [0096] 131: Perforation [0097] 140: Non-woven fabric