CN107413132B - Air filter based on metal foam - Google Patents
Air filter based on metal foam Download PDFInfo
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- CN107413132B CN107413132B CN201710750408.4A CN201710750408A CN107413132B CN 107413132 B CN107413132 B CN 107413132B CN 201710750408 A CN201710750408 A CN 201710750408A CN 107413132 B CN107413132 B CN 107413132B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2455—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the whole honeycomb or segments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/785—Regeneration of the filtering material or filter elements inside the filter by electrical means, e.g. for the generation of electrostatic forces in order to reject particles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D51/00—Auxiliary pretreatment of gases or vapours to be cleaned
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/06—Polluted air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention discloses an air filtering device based on metal foam, belonging to the field of indoor air purification; the device comprises a discharge needle array plate, a perforated metal plate, an upstream metal net, metal foam and a downstream metal net which are sequentially arranged in a runner area of an openable insulating shell along the air flow direction, wherein two positive polarity output power supplies are arranged in a non-runner area of the openable insulating shell; the first power supply positive electrode is connected with the discharge needle array plate, and the grounding electrode is connected with the perforated metal plate; the second power supply positive electrode is connected with the upstream metal net, and the grounding electrode is connected with the downstream metal net; the metal foam is detachably connected with the openable insulating shell. The device is used for efficiently capturing indoor particles through the area between the discharge needle array plate and the perforated metal plate and the area between the upstream metal net and the downstream metal net; the device has a simple structure, provides a mode of low ozone generation, can realize low resistance and high efficiency removal of indoor particulate matters for a long time, and can realize recycling after cleaning.
Description
Technical Field
The invention relates to an air filtering device based on metal foam, and belongs to the technical field of indoor air purifying equipment.
Background
There have been numerous studies showing that particulate matter can have many negative effects on human health and even be life threatening. In order to reduce particulate matter pollution introduced into a room by ventilation, a particulate matter high-efficiency filtering device is often added into a fresh air system in public buildings. However, in the annual energy consumption of public buildings in China, the heating ventilation and air conditioning system accounts for 50-60%, and the fresh air system accounts for 20-30% of the heating ventilation and air conditioning system. Therefore, the reduction of the resistance of the particulate matter high-efficiency filtering device is an effective method for improving the energy efficiency of the heating ventilation air conditioning system. Therefore, in practical application, not only high efficiency but also low-resistance particulate matter removal technology is needed, so that the building energy consumption is reduced while the health of people is ensured.
Common indoor particulate matter low-resistance high-efficiency purification technology comprises the following steps: electrostatic dust removal, electret air filtration, and charge-carrying electret air filtration. The electrostatic precipitator has the defects of easy generation of a large amount of ozone (mainly because the dust removing plate of the existing electrostatic precipitator needs a strong deflection electric field perpendicular to the flow direction, and has discharge breakdown phenomenon, thereby generating a large amount of ozone), huge volume, small dust holding capacity and the like, and has certain limitation in indoor purification of civil buildings. In recent years, electret air filters and charge-type electret air filters are degraded in efficiency after a period of use. In the electret air filter, the charges generated on the surface of the electret are not permanent and can be lost due to the influence of ambient humidity and charged ions in the air; for the charge electret air filter, the effect of static electricity accumulation is that the charged particles are more difficult to be trapped by the dust collecting plate, so the filter must be cleaned from time to maintain the cleaning efficiency. For the two types of filters, the dust collecting channel is narrow and long, the device is large in size, and certain difficulties are caused to installation, maintenance and cleaning.
In addition to the above-mentioned technologies, recently, a technology for purifying particles by electrostatic enhancement filtration using a coarse-effect filter screen has been proposed, which can stably realize low-resistance and high-efficiency removal of indoor particles for a long period of time. The technology is based on a common coarse filter, and the particulate matters are positively charged through a particulate matter pre-charge part formed by a perforated metal plate connected with a grounding electrode and a metal discharge wire connected with a power supply anode; the filter screen is polarized through the filter screen polarization part formed by the metal discharge wire connected with the positive electrode of the power supply and the metal net connected with the grounding electrode, so that the positive and negative charges are separated from the fiber surface of the filter screen. Thereby further trapping the charged particles by the polarizing filter. According to the long-term experimental result of the device, as the technology adopts molybdenum wires or tungsten wires for discharging, on one hand, the discharge wires are easy to oxidize and rust and even break, so that a large amount of ozone is generated and even the device fails; on the other hand, the discharge surface area of the discharge wire is large, so that dust is easy to accumulate, and the filtration efficiency is reduced or a large amount of ozone is generated. And because the technology adopts the common coarse-effect filter screen, the internal fiber structure can be destroyed after cleaning, and the phenomena of resistance increase, static enhanced filtration efficiency reduction and the like can also be caused, so that the filter screen must be continuously updated, and resource waste is caused.
Therefore, there is a need for a cleaning device that can be repeatedly used after cleaning, produces low ozone, and can stably achieve low-resistance and high-efficiency particulate removal for a long period of time.
Disclosure of Invention
In order to overcome the defects that the existing electrostatic enhancement filtration technology can reduce the efficiency or generate a large amount of ozone after being used for a period of time, a filter screen cannot be cleaned and then reused, and the like, the invention provides the air filtration device based on the metal foam.
In order to achieve the above purpose, the present invention mainly achieves the following technical solutions:
an air filtration device based on metal foam, comprising: a discharge needle array plate (4), a perforated metal plate (5), an upstream metal net (6), metal foam (8) and a downstream metal net (9) which are sequentially arranged in the flow passage area of the openable insulating shell (2), wherein a first power supply (1) and a second power supply (3) are arranged in the non-flow passage area of the openable insulating shell (2); the flow passage area of the insulating shell (2) can be opened, and the opening end is perpendicular to the air flow direction; the positive electrode of the first power supply (1) is connected with the discharge needle array plate (4), and the grounding electrode of the first power supply (1) is connected with the metal plate (5) with holes; the positive electrode of the second power supply (3) is connected with the upstream metal net (6), and the grounding electrode of the second power supply (3) is connected with the downstream metal net (9); the discharge needle array plate (4) is in fit with the perforated metal plate (5), the perforated metal plate (5) is in fit with the upstream metal mesh (6), and the upstream metal mesh (6) is in fit with the metal foam (8), and the metal foam (8) is in fit with the downstream metal mesh (9); the metal foam (8) is detachably connected with the openable insulating shell (2) through the fixing part (7).
The first power supply (1) and the second power supply (3) are direct-current positive power supplies, and the polarities of the first power supply and the second power supply are positive.
The discharge needle array plate (4) is composed of a plurality of horizontal metal steel bars which are uniformly distributed along the direction perpendicular to the air flow direction at intervals of 30-60 mm and a plurality of stainless steel needles which are uniformly distributed on the metal steel bars at intervals of 30-60 mm.
Each stainless steel needle of the discharge needle array plate (4) corresponds to the holes in the metal plate (5) with holes one by one, and the needle points of the stainless steel needles are positioned on the central axis of the corresponding round holes.
The distance left between the metal steel bar of the discharge needle array plate (4) and the metal plate with holes (5) is 5-15 mm longer than the length of the stainless steel needles; the distance between the perforated metal plate (5) and the upstream metal net (6) is 15-30 mm; the distance between the upstream metal net (6) and the downstream metal net (9) is 15-30 mm and is at least 10mm longer than the thickness of the metal foam (8).
The metal foam (7) is a single layer, the thickness is 5-20 mm, the pore diameter is 20-90 ppi, the porosity is more than 75%, and the pores in the metal foam are mutually communicated.
The invention has the characteristics and beneficial effects that:
on the basis of metal foam, the device of the invention charges particles positively through a particle pre-charge part formed by a discharge needle array plate connected with a power supply anode and a perforated metal plate connected with a grounding electrode; an electric field is formed by a dust collecting part consisting of an upstream metal net connected with the anode of another power supply and a downstream metal net connected with the grounding electrode, so that charged particles are more easily captured by metal foam. Because the discharge is performed by the stainless steel needle, the discharge electrode is neither rusted nor dust accumulated, and the effective charge on the particulate matters (namely the high efficiency of the whole device) can be kept for a long time and the low ozone generation amount can be kept. Because the metal foam is low in porosity and large in aperture, the air filtering device is low in resistance and large in dust holding capacity while high efficiency is realized, and the phenomenon of static electricity accumulation can not occur in the using process. Meanwhile, the metal foam has better strength, and the metal foam is cleaned after being used for a period of time, so that the internal structure is not damaged and the efficiency is not reduced. The openable insulating shell and the metal foam fixing part can be used for installing and detaching the metal foam, so that the device can be recycled.
In addition, compared with the common electrostatic precipitator, the dust collecting part is made of more compact porous metal foam, so that the dust collecting area is greatly increased, the requirement on the charge quantity of particulate matters is reduced, the front end discharge voltage can be correspondingly reduced, and a large amount of ozone is avoided; meanwhile, a strong deflection electric field perpendicular to the flow direction of a dust collecting plate of a common electrostatic dust collector is not needed, so that the phenomenon of discharge breakdown is avoided, and meanwhile, the generation of ozone is also avoided.
In summary, the invention has simple structure, provides a mode of low ozone generation and long-term realization of low resistance and high-efficiency removal of indoor particulate matters, and can realize recycling after cleaning.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a schematic view along the line C-C in fig. 1.
Fig. 3 is a schematic view along the line D-D in fig. 1.
Fig. 4 is a schematic cross-sectional view of a single discharge needle and its corresponding metal plate hole.
In the figure: 1-a first power supply, 2-an openable insulating shell, 3-a second power supply, 4-a discharge needle array plate, 5-a perforated metal plate, 6-an upstream metal net, 7-a fixing part, 8-metal foam and 9-a downstream metal net.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
The invention provides an air filtering device based on metal foam, the whole structure is shown in figure 1, the device comprises: the discharge needle array plate 4, the perforated metal plate 5, the upstream metal net 6, the foam metal 8 and the downstream metal net 9 are arranged in the flow passage area of the openable insulating shell 2, the first power supply 1 and the second power supply 3 are arranged in the non-flow passage area of the insulating shell 2, and the flow passage area of the openable insulating shell 2 is opened and is perpendicular to the air flow direction; wherein, the positive pole of the first power supply 1 is connected with the discharge needle array plate 4, and the grounding electrode of the first power supply 1 is connected with the metal plate 5 with holes; the positive electrode of the second power supply 3 is connected with the upstream metal net 6, and the grounding electrode of the second power supply 3 is connected with the downstream metal net 9; a discharge needle array plate 4, a perforated metal plate 5, an upstream metal mesh 6, a foam metal 8 and a downstream metal mesh 9 are installed in the flow passage area in the air flow direction (i.e., from a to B direction shown in fig. 1) in this order; the discharge needle array plate 4 is in fit with the perforated metal plate 5, the perforated metal plate 5 is in fit with the upstream metal mesh 6, and the upstream metal mesh 6 is in fit with the metal foam 8, and the metal foam 8 is in fit with the downstream metal mesh 9; the metal foam 8 is detachably connected with the insulating housing 2 through a fixing portion 7, and the fixing portion 7 is used for mounting and dismounting the metal foam 8.
The specific implementation mode and the functions of each component of the invention are as follows:
the air flow channels (except the air inlet A and the air outlet B) of the air filtering device and the first power supply 1 and the second power supply 3 are packaged by an insulating shell 2. The insulating housing 2 can be opened, the overhaul device is convenient, the metal foam is replaced, and the openable part is sealed by a silicon rubber strip and is screwed up by a screw. This example uses an organic glass with a thickness of 8mm as the insulating housing material. The cross-sectional dimensions of the air flow channels were 0.24m by 0.16m.
The first power supply 1 and the second power supply 3 in the air filtering device both adopt direct-current positive power supplies, and the polarity is positive, so that ozone generation is reduced. Wherein, first power 1: a direct-current positive power supply is selected, and +7 to +15kV is output, so that corona discharge can be ensured, meanwhile, the ozone generation amount is small, and the embodiment adopts a direct-current power supply with +12kV output; second power supply 3: a direct-current positive power supply is selected, and +5 to +15kV is output, so that power short circuits caused by air breakdown are avoided, and the embodiment adopts a direct-current power supply with +6kV output.
Discharge needle array plate 4: the discharge needle array plate consists of a plurality of horizontal metal steel bars which are uniformly distributed along the direction perpendicular to the air flow direction at intervals of 30-60 mm and stainless steel needles which are uniformly distributed on the metal steel bars at intervals of 30-60 mm and are supported on the metal steel bars. The length of each metal steel bar is the same as the length or width of the air flow channel, the width is not more than 10mm, and the thickness is not more than 3mm; the metal steel strip is coated with an insulating coating except for the contact point with the stainless steel pin so as to avoid discharge at the metal steel strip. Each stainless steel needle corresponds to the round hole in the metal plate 5 with holes one by one, the needle length is 10-30 mm, the needle point is located on the central axis of the corresponding round hole, and the non-needle point of the stainless steel needle is supported on the metal steel bar. In the embodiment, 4 stainless steel bars with the length, width and thickness of 240mm, 6mm and 2mm are adopted, and all the metal steel bars are uniformly arranged perpendicular to the edge of an air flow channel with the length of 0.16m and are connected in series by a wire; 6 stainless steel needles with the length of 20mm are uniformly supported on each metal steel bar along the length direction; i.e. the distance between the stainless steel needles adjacent to the same row or column on the whole discharge needle array plate is 40mm, and the distance between one column of stainless steel needles close to the inner wall of the insulating shell 2 and the inner wall of the insulating shell is 20mm, as shown in figure 2.
Perforated metal sheet 5: the thickness of the metal plate with the holes is not more than 2mm, stainless steel materials are selected to be used for manufacturing, round holes in the metal plate are evenly distributed, the diameter of each hole is 20-40 mm, each hole corresponds to one of stainless steel needles on the discharge needle array plate 4, and chamfering angles of 30-60 degrees are arranged at the edges of the holes. In this embodiment, a stainless steel plate with a thickness of 1mm is used, the diameter of the round hole is 30mm, and the edge of the hole is provided with a chamfer of 45 degrees, as shown in fig. 3 and 4. The distance between the plane of the perforated metal plate 5 and the plane of the metal steel bars of the discharge needle array plate 4 is 30mm, and the distance between the plane of the perforated metal plate 5 and the plane of the upstream metal mesh 6 is 20mm.
Upstream metal mesh 6: the stainless steel material is selected, the mesh number is not more than 18, and the thickness is not more than 2mm. This example uses an 8 mesh stainless steel wire mesh 1mm thick.
Metal foam 7: and selecting metal foam with low resistance, wherein the thickness is 5-20 mm, the resistance of the metal foam is less than 20Pa, the pore diameter is 20-90 ppi, the porosity is more than 75%, the pores in the metal foam are basically communicated with each other, and the porosity is more than 98% under the condition that the head-on wind speed is 1 m/s. The metal foam is made of one or more of the following materials: iron, cobalt, nickel, zinc, copper. This example uses foam iron, 8mm thick, with a porosity of 25ppi.
Fixing portion 8: is made of insulating block frame-shaped materials and is fixed on the side wall of the insulating shell 1. In this example, 2 rectangular organic glass frames having an outer cross-sectional dimension of 0.24m×0.16m, an inner cross-sectional dimension of 0.20×0.12m, and a thickness of 5mm were used as the fixing portions 8 of the filter screen, and the metal foam 7 and the downstream metal mesh 9 were clamped between the two frames.
Downstream wire mesh 9: the stainless steel material is selected, the mesh number is not more than 18, and the thickness is not more than 2mm. This example uses an 8 mesh stainless steel wire mesh 1mm thick. The distance between the plane of the upstream wire 6 and the plane of the downstream wire 9 is 20mm.
In the air filtering device, a particulate matter pre-charge part is arranged between the discharge needle array plate 4 and the perforated metal plate 5, a dust collecting part is arranged between the upstream metal net 6 and the downstream metal net 9, and particulate matter filtering is realized by the two parts together. The distance left between the metal steel bars of the discharge needle array plate 4 and the perforated metal plate 5 is 5-15 mm longer than the length of the stainless steel needles: the ion discharge device is not smaller than 5mm to avoid power short circuit caused by air breakdown, and not larger than 15mm to ensure that more ions are generated to fully discharge. The distance between the perforated metal plate 5 and the upstream metal net 6 is 15-30 mm: not less than 15mm to avoid power short circuit caused by air breakdown between the upstream metal net and the metal plate with holes, not more than 30mm to save the space of the filter device; the distance between the upstream metal mesh 6 and the downstream metal mesh 9 is 15-30 mm and at least 10mm greater than the thickness of the metal foam 8: is not less than 15mm and at least 10mm more than the thickness of the foam metal 8 so as to avoid power short circuit caused by air breakdown, and is not more than 30mm so as to keep higher polarized dust collection electric field intensity, thereby ensuring the filtering efficiency of the device.
The operation process of the embodiment is as follows: the air filtering device is arranged in an air duct or an air supply outlet of the fresh air system, so that air to be filtered passes through in the direction from A to B, and then the first power supply 1 and the second power supply 3 are connected, so that an air filtering mode can be operated.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An air filtration device based on metal foam, comprising: a discharge needle array plate (4), a perforated metal plate (5), an upstream metal net (6), metal foam (8) and a downstream metal net (9) which are sequentially arranged in the flow passage area of the openable insulating shell (2), wherein a first power supply (1) and a second power supply (3) are arranged in the non-flow passage area of the openable insulating shell (2); the flow passage area of the insulating shell (2) can be opened, and the opening end is perpendicular to the air flow direction; the positive electrode of the first power supply (1) is connected with the discharge needle array plate (4), and the grounding electrode of the first power supply (1) is connected with the metal plate (5) with holes; the positive electrode of the second power supply (3) is connected with the upstream metal net (6), and the grounding electrode of the second power supply (3) is connected with the downstream metal net (9); the discharge needle array plate (4) is in fit with the perforated metal plate (5), the perforated metal plate (5) is in fit with the upstream metal net (6), the upstream metal net (6) is in fit with the metal foam (8), the distance between the metal steel bars of the discharge needle array plate (4) and the perforated metal plate (5) is 5-15 mm longer than the length of the stainless steel needles, the distance between the perforated metal plate (5) and the upstream metal net (6) is 15-30 mm, and chamfers are arranged at the edges of the openings of the perforated metal plate (5); the metal foam (8) is detachably connected with the openable insulating shell (2) through the fixing part (7); the particulate matter is positively charged by a particulate matter pre-charge part formed by the discharge needle array plate (4) connected with the positive electrode of the first power supply (1) and the perforated metal plate (5) connected with the grounding electrode of the first power supply (1), and an electric field is formed by a dust collection part formed by the upstream metal net (6) connected with the positive electrode of the second power supply (3) and the downstream metal net (9) connected with the grounding electrode of the second power supply (3).
2. An air filtration device according to claim 1, wherein the first power supply (1) and the second power supply (3) are direct positive power supplies and both polarities are positive.
3. The air filtering device according to claim 1, wherein the discharge needle array plate (4) is composed of a plurality of horizontally-oriented metal steel bars uniformly arranged at intervals of 30-60 mm in a direction perpendicular to an air flow direction and a plurality of stainless steel needles uniformly arranged at intervals of 30-60 mm supported on the horizontally-oriented metal steel bars.
4. An air filtration device according to claim 3, wherein each metal strip of the discharge needle array plate (4) has a length equal to the length or width of the air flow path, a width not exceeding 10mm, and a thickness not exceeding 3mm.
5. An air filtration device according to claim 3, wherein each metal strip of the array of discharge needles (4) is coated with an insulating coating except for the contact points with the stainless steel needles.
6. An air filtering device according to claim 3, wherein each stainless steel needle of the discharge needle array plate (4) corresponds to a hole in the metal plate (5) with a hole one by one, and the needle tip of the stainless steel needle is positioned on the central axis of the corresponding round hole.
7. An air filtration device according to claim 3, wherein the length of each stainless steel needle of the discharge needle array plate (4) is 10-30 mm.
8. The air filtering device according to claim 1, wherein the holes in the perforated metal plate (5) are round holes with diameters of 20-40 mm, and chamfers with angles of 30-60 degrees are arranged on the edges of the holes.
9. An air filtration device according to claim 1, wherein the perforated metal sheet (5), the upstream metal mesh (6) and the downstream metal mesh (9) are stainless steel sheets having a thickness of not more than 2mm.
10. An air filtration device according to claim 1, characterized in that the distance between the upstream metal mesh (6) and the downstream metal mesh (9) is 15-30 mm and at least 10mm longer than the thickness of the metal foam (8).
11. An air filtration device according to claim 1, wherein the metal foam (8) is a single layer, has a thickness of between 5 and 20mm, has a pore size of between 20 and 90ppi, has a porosity of above 75%, and is interconnected between pores in the metal foam.
12. An air filtration device according to claim 1, wherein the metal foam (8) is made of one or more of the following materials: iron, cobalt, nickel, zinc, copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710750408.4A CN107413132B (en) | 2017-08-28 | 2017-08-28 | Air filter based on metal foam |
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|---|---|---|---|
| CN201710750408.4A CN107413132B (en) | 2017-08-28 | 2017-08-28 | Air filter based on metal foam |
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| CN107413132A CN107413132A (en) | 2017-12-01 |
| CN107413132B true CN107413132B (en) | 2023-08-04 |
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| CN108435421A (en) * | 2018-05-15 | 2018-08-24 | 葛洪 | Electricity consumption mist in construction site combines air cleaning unit |
| CN110115904A (en) * | 2019-06-18 | 2019-08-13 | 山西安泰控股集团科技有限公司 | Pulsed plasma smoke and dust purifier |
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| CN102958264A (en) * | 2012-11-20 | 2013-03-06 | 浙江大学 | Plasma generation device and method based on back corona creeping-surface breakdown of catalyst as well as application thereof |
| CN103048169A (en) * | 2012-12-11 | 2013-04-17 | 上海海事大学 | Initiative microenvironment air persistent organic pollutant sampling device and method |
| CN207413014U (en) * | 2017-08-28 | 2018-05-29 | 清华大学 | A kind of air filter based on metal foam |
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