JP2002126432A - Separator for air filter and air filter - Google Patents

Separator for air filter and air filter

Info

Publication number
JP2002126432A
JP2002126432A JP2000325732A JP2000325732A JP2002126432A JP 2002126432 A JP2002126432 A JP 2002126432A JP 2000325732 A JP2000325732 A JP 2000325732A JP 2000325732 A JP2000325732 A JP 2000325732A JP 2002126432 A JP2002126432 A JP 2002126432A
Authority
JP
Japan
Prior art keywords
separator
air filter
filter
porous
air
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000325732A
Other languages
Japanese (ja)
Inventor
Noriaki Sato
Masanobu Tsuda
典明 佐藤
正信 津田
Original Assignee
Nippon Sheet Glass Co Ltd
日本板硝子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Sheet Glass Co Ltd, 日本板硝子株式会社 filed Critical Nippon Sheet Glass Co Ltd
Priority to JP2000325732A priority Critical patent/JP2002126432A/en
Publication of JP2002126432A publication Critical patent/JP2002126432A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/10Particle separators, e.g. dust precipitators, using filter plates, sheets, or pads having plane surfaces, i.e. axial filtering
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D46/00Filters, i.e. particle separators or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/523Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with means for maintaining spacing between the pleats or folds

Abstract

PROBLEM TO BE SOLVED: To provide a separator for an air filter capable of constituting a compact and inexpensive air filter having a capturing function of particles, micro amounts of gas, etc., a long filter life, excellent capturing efficiency and to provide a high performance air filter using the separator for the air filter. SOLUTION: In the separator 6 for the air filter, at least one part is a porous material. The air filter uses this separator 6 for the air filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filter for filtering a gas and a separator used for the air filter. Further, the present invention relates to an air filter separator having a function of collecting particles and trace gases, and a high-performance air filter using the air filter separator. It should be noted that the air filter separator and the air filter to be purified by the present invention include gases other than air. Hereinafter, “air” generally refers to gas.

[0002]

2. Description of the Related Art As an air filter used in an air conditioner or the like, as shown in a partially cutaway perspective view of FIG. Filter pack 3 with separator 2 inserted,
A folding air filter 5 incorporated in the outer frame 4 is used. Note that, in FIG. 2, arrows indicate the direction of air flow.

In this folding air filter 5,
As the corrugated plate-like separator 2, a corrugated plate made of metal foil or paper such as aluminum or stainless steel is used. The corrugated separator 2 has the function of reinforcing the filter strength and a rectifying function of suppressing the turbulent flow when air passes through the air filter and reducing the pressure loss. There is no function to collect gas.

Conventionally, in such a folding air filter, the following measures have been made in order to suppress an increase in pressure loss and to improve the collection efficiency of particulates and the like and the life of the filter. I was That is, for example, a HEPA filter for creating a dust-free and sterile environment is expensive, so a pre-filter or a medium-performance filter is arranged on the upstream side to collect large particles in advance, thereby reducing the pressure loss. The rise is reduced to extend the life of the filter. Further, in a semiconductor manufacturing process or the like, a chemical filter using activated carbon, ion exchange resin, or the like as a material is installed upstream of the ULPA filter in order to remove trace gases at a high level. Particularly, when high clean air is required, a filter for acidic gas, a filter for basic gas, and a filter for organic gas are installed in three stages as chemical filters. In addition, in order to increase the removal efficiency of trace gas, filter materials for chemical filters and HEPA
Alternatively, a filter using a laminated filter material obtained by superposing a filter material for collecting particles of medium performance or the like, and a filter obtained by applying an adsorbent to the surface of a corrugated separator are provided.

[0005]

However, the conventional foldable air filter has the following problems. In collecting liquid particles such as oil mist, the filter life is short. That is, when the amount of collected liquid particles increases, the liquid particles aggregate, form a film on the surface of the filter medium, and cause a rapid increase in pressure loss, so that long-term use is impossible. When filters are arranged in multiple stages to reduce the rise in pressure loss or remove trace gases, the air conditioning equipment including the maintenance space becomes large, and a large equipment space is required. Further, since a plurality of air filters are required, the cost of the apparatus is high. When a plurality of filter media are used in an overlapping manner, a filter media having a small basis weight is preferably used in order to suppress an increase in pressure loss. Therefore, the contact time of the trace gas cannot be sufficiently secured, the collection efficiency is insufficient, and the filter performance is inferior. In applying the adsorbent to the corrugated separator, the filter life cannot be sufficiently ensured due to the shortage of the adsorbent adsorption capacity.

The present invention solves the above-mentioned problems in the prior art, has an excellent function of collecting particles and trace gases, has a long filter life, and can constitute a compact and inexpensive air filter. And an air filter using the same.

[0007]

An air filter separator according to the present invention is characterized in that at least a part thereof is porous. Of course, the whole may be porous. The presence of the porous portion in the separator exerts a function of collecting particles, trace gases, and the like. That is, the trapping ability of the filter material of the air filter is supplemented by the porous portion, so that the trapping efficiency of the air filter can be improved and the life can be extended.

[0008] The shape of the separator of the present invention is not particularly limited. Good. However, when such a bulk body is used, a rectifying effect cannot be expected from the separator. Therefore, when importance is placed on suppressing the pressure loss, the separator is preferably formed into a corrugated plate. The corrugated separator is
In order to maintain the shape, it is preferable that one is reinforced with a metal foil 14 as shown in FIG.

[0009] The term "porous" in the present invention means that the internal porosity is 50% or more. The preferred range of the porosity is 60 to 70%.

Examples of the material constituting the porous portion include organic fibers, inorganic fibers, and metal fibers, and more specifically, polypropylene fibers or fibrous activated carbon are preferable. By forming these fibers into a nonwoven fabric, a porous portion is formed.

The porous portion may carry an adsorbent.

The air filter of the present invention uses a separator having a porous portion in an air filter in which a filter medium is folded into a pleated shape, and a separator is inserted in a gap between the folded portions, and traps particles and trace gases. Since it is excellent in collecting effect and has a long life and does not need to be provided with another filter, it is possible to reduce the size of equipment, reduce installation space, and reduce equipment cost.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. In addition, it is not limited to the following embodiment.

FIG. 1 is a partially cutaway perspective view of an air filter having a separator according to the present invention. Non-woven fabric (bulk body) is used for separators with porous portions
This was placed upstream.

The porous part has an internal porosity of 50%.
It is necessary to be above. If the porosity is less than 50%, the efficiency of collecting particles and trace gases will not be sufficiently improved. on the other hand,
If the porosity is too high, the strength and shape retention of the separator cannot be maintained, so that it is preferably 70% or less in practical use. Therefore, a preferable range of the porosity is 60 to 70%. The porosity is 70%.
When the pressure exceeds, turbulence tends to occur near the porous part,
The pressure loss due to this turbulence is a new problem.

The shape of the separator is not particularly limited, and may be a simple bulk or a corrugated plate similar to the conventional one. In order to suppress the rise in pressure loss,
The surface condition is preferably as smooth as possible.

The material of the porous portion is not particularly limited, and is appropriately selected according to required characteristics. For example, polypropylene fiber, fibrous activated carbon, glass fiber,
Examples include metal fibers and mixed fibers thereof. By forming these into a nonwoven fabric by a known means such as a papermaking method or a spreading process, a porous portion can be obtained. Among the above-mentioned fibers, when a nonwoven fabric of glass fiber is used as the filter medium, it is preferable to use a separator made of the same glass fiber in order to prevent the occurrence of leakage or breakage due to a difference in thermal expansion when used at a high temperature. When fibrous activated carbon is used, trace gas and the like are more effectively collected by the adsorption function of the activated carbon itself.

[0018] The separator according to the present invention can exhibit a trapping function based on porosity even if it is arranged on either the upstream side or the downstream side of the air filter. In addition, if it is arranged on both the upstream side and the downstream side, this trapping function will be more effectively exhibited. However, if they are arranged on both sides, it is difficult to expect a rectifying effect in the separator. Therefore, when pressure loss is a problem, it is preferable to arrange them on either the upstream side or the downstream side. In this case, it is preferable to arrange the filter medium on the upstream side which greatly affects the life of the filter medium.

When only a part of the separator is porous, the production method is not particularly limited. For example, a method of bonding one side of a nonwoven fabric of the above-described fiber to a metal foil having a shape maintaining performance, or sandwiching and integrating with a metal foil, and folding the nonwoven fabric and the metal foil together can be mentioned. . If the separator has a corrugated shape, a rectifying effect can be obtained, and an increase in pressure loss due to the porosity can be suppressed.

The separator is mounted on the air filter by known means, and the air filter is small,
It has excellent effects such as low cost and high performance.

[0021]

The present invention will be described more specifically with reference to the following examples and comparative examples. For convenience of explanation,
First, a comparative example will be described.

(Comparative Example 1) An oil mist collection test was performed on a conventional foldable air filter having the structure shown in FIG. In this air filter, a 35 μm-thick aluminum foil was used as a corrugated separator, and a glass fiber filter paper having a transmittance of 0.3 μm particles of 4% or less was used as a filter medium. The outer frame is a drawn aluminum material,
The dimensions are 500 mm (H) x 400 mm (W) x 150 mm (D).
This air filter corresponds to a quasi-HEPA filter.

The measurement of the amount of retained oil mist is described in JIS.
B9908 Ventilation air filter unit Model 2 "
Using a device conforming to the measurement of, the set air volume 10m 3 / min,
The test was performed at an oil mist concentration of 10 g / min. Measure the weight of the filter in advance, and the pressure drop is 30 ~
Each time the pressure increased by 50 Pa, the weight of the filter was measured, and the oil adhesion amount at that time was determined. The results are shown in Table 1 and FIG.

Example 1 An oil mist collection test was performed on an air filter using a separator 6 having a porous portion on the upstream side of the configuration shown in FIG. The separator having a porous portion is made of a polypropylene felt having a basis weight of 150 g / m 2 and a thickness of 5 mm (porosity of 60%, pressure loss of 24.5 Pa or less at a ventilation of 2.5 m / s in the thickness direction). 125mm (direction of air flow) x 470mm x 5
The one cut into mm was used. Except for using this separator, it is completely the same as Comparative Example 1. The results are shown in Table 1 and FIG.

[0025]

[Table 1]

As is clear from Table 1 and FIG. 4, the pressure loss value that increases with the amount of oil adhering is initially lower in Comparative Example 1, but reversed around 250 Pa in pressure loss.
According to the separator of the present invention, an increase in pressure loss due to oil adhesion can be suppressed to a low level.

[0027]

As described in detail above, since the air filter separator of the present invention has a function of collecting particles and trace gases, when collecting oil mist, liquid particles are collected by the filter medium. Before being trapped in the porous portion of the separator. Since the porous material has large pores, the rise in pressure loss is small.
In addition, when the trapping amount increases, the trapped liquid particles move downward as droplets, so that the load on the filter medium is reduced and the life of the air filter is prolonged. There is no need to provide a pre-filter or a chemical filter, and the equipment can be made compact and the installation space can be reduced. There is no need to separately install a pre-filter or a chemical filter, and equipment costs can be reduced accordingly. With such an effect, stable and efficient purification can be performed over a long period of time, and high-cleaning air can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a structure of an air filter of the present invention.

FIG. 2 is a partially cutaway perspective view showing the structure of a conventional folding air filter.

FIG. 3 is a perspective view showing an embodiment of the air filter separator of the present invention.

FIG. 4 is a graph showing a relationship between an oil adhesion amount of an air filter and a pressure loss value obtained in Example 1 and Comparative Example 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter material 2 Corrugated separator 3 Filter pack 4 Outer frame 5 Foldable air filter 6 Separator having a porous portion 10 Corrugated separator 11 Concave 12 Convex 13 Porous sheet 14 Metal foil

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4D019 AA01 AA03 BA03 BA13 BB03 BC05 CB01 CB03 4D058 JA13 JB03 JB05 JB12 JB18 KA08 KA21 TA02 TA03

Claims (6)

[Claims]
1. An air filter separator which is at least partially porous.
2. The porosity of the porous portion is 60 to 70%.
The separator for an air filter according to claim 1, wherein
3. The air filter separator according to claim 1, wherein the porous portion is made of a nonwoven fabric of fibers.
4. The air filter separator according to claim 1, wherein an adsorbent is carried on the porous portion.
5. An air filter using the separator according to claim 1.
6. The air filter according to claim 5, wherein the separator having the porous portion is disposed on an upstream side.
JP2000325732A 2000-10-25 2000-10-25 Separator for air filter and air filter Pending JP2002126432A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000325732A JP2002126432A (en) 2000-10-25 2000-10-25 Separator for air filter and air filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000325732A JP2002126432A (en) 2000-10-25 2000-10-25 Separator for air filter and air filter

Publications (1)

Publication Number Publication Date
JP2002126432A true JP2002126432A (en) 2002-05-08

Family

ID=18803049

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000325732A Pending JP2002126432A (en) 2000-10-25 2000-10-25 Separator for air filter and air filter

Country Status (1)

Country Link
JP (1) JP2002126432A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007268501A (en) * 2006-03-31 2007-10-18 Nippon Muki Co Ltd Separator type air filter and method of manufacturing the same
WO2016185511A1 (en) * 2015-05-15 2016-11-24 日本ケンブリッジフィルター株式会社 High-temperature filter

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007268501A (en) * 2006-03-31 2007-10-18 Nippon Muki Co Ltd Separator type air filter and method of manufacturing the same
JP4733551B2 (en) * 2006-03-31 2011-07-27 日本無機株式会社 Separator air filter and manufacturing method thereof
WO2016185511A1 (en) * 2015-05-15 2016-11-24 日本ケンブリッジフィルター株式会社 High-temperature filter
US20180154299A1 (en) * 2015-05-15 2018-06-07 Cambridge Filter Japan, Ltd. High-temperature Filter

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