JPH11128643A - Filter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter unit capable of being appropriately used as a chemical filter for removing a chemical pollutant in an air relatively low in wind-speed and easy in exchanging of a filter sheet. SOLUTION: A main body 2 in which a long and thin supporting material 7 is arranged in a box frame 6 having a prescribed depth in a fluid passing direction, a frame shaped filter putting frame 3 provided detachably to the main body 2 and in which plural long and thin press materials 9 are arranged and the filter sheet 5 arranged at a fluid passing part of the main body 2 are provided. When the filter-putting frame 3 is mounted at the main body 2, both surfaces of the filter sheet 5 are alternately supported with a supporting material 7 and the press material 9 and held wavelike.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter unit for removing impurities in a fluid, and more particularly to a filter unit suitable for filtering gas having a relatively low wind speed passing through the filter.

[0002]

2. Description of the Related Art Conventionally, a filter device has been used to remove impurities present in a fluid such as a gas or a liquid. The filter unit used in the filter device is
Various types are used depending on the purpose and the object to be removed.
For example, in a semiconductor or liquid crystal manufacturing process, or a food or pharmaceutical manufacturing process, it is required to remove chemical contaminants and dust floating in the air to an extremely low level, and thus has an extremely high removal performance. A chemical filter is used. A filter sheet made of ion-exchange fiber, a filter sheet made of activated carbon fiber, a filter sheet to which activated carbon is attached, and a substance obtained by adding an adsorbed substance to activated carbon are attached to a chemical filter that removes such chemical contaminants. A filter unit having a filter sheet or the like is used. As such a filter unit, a pleated type, a bag type, a tray type and the like are known. The pleated type is one in which a filter sheet is mounted in a wave shape in a main body and sealed, and the bag type is one in which the filter sheet is processed into a bag shape and mounted in the main body. In the tray type, a frame having a filter sheet is housed in multiple stages in a main body.

[0003]

However, the conventional pleated filter unit has a complicated structure and is expensive.
There is a problem that it is difficult to attach and detach the filter sheet to and from the main body when reproducing the filter sheet. Further, the bag-type filter unit has a problem in that the cost for processing the filter sheet into a bag-like shape is large, and when regenerated, the shape is lost and the filtering performance and the like are reduced. Further, the tray type filter unit has a problem that the structure of the filter tray and the shelves and frames supporting the tray are complicated and expensive. Therefore, there has been a strong demand for a filter unit that is low in cost, easily attached to and detached from the main body when the filter sheet is regenerated, and has a simple structure. An object of the present invention is to provide a filter unit satisfying such a demand.

[0004]

According to a first aspect of the present invention, there is provided a filter unit comprising: a main body in which a plurality of elongated support members are arranged in a box having a predetermined depth in a fluid passage direction; A frame-shaped filter stretching frame which is detachable from the main body and in which a plurality of elongated holding members are aligned,
A filter sheet disposed in the fluid passage section of the main body. Then, when the filter stretching frame is attached to the main body in a state where the filter sheet is in contact with the support material, the pressing material is inserted deeper than the supporting material, whereby both sides of the filter sheet are alternately supported by the supporting material and the pressing material. It is characterized by being held in a wave shape. The invention according to claim 2 is an embodiment of the filter unit according to claim 1, wherein the filter sheet is made of ion exchange fibers or activated carbon fibers.

In the above-mentioned filter unit, the filter sheet is attached to the main body in a wavy manner by attaching the filter extension frame to the main body with the filter sheet in contact with the support material. Further, if the filter extension frame is detached from the main body, the filter sheet can be removed from the main body as it is. Therefore, the attachment and detachment of the filter sheet is extremely easy, and the structure is simple and the cost can be reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example in which the filter unit of the present invention is applied to a chemical filter for filtering gas will be described with reference to the drawings. FIG. 1 is a schematic partially cutaway perspective view showing a state where the filter unit of the present invention is assembled.
FIG. 3 is a perspective view showing an example of a main body and a filter extending frame forming a filter unit. In these figures, a filter unit 1 includes a main body 2 made of a plate material such as metal or plastic, a filter extension frame 3 made of a similar material detachably attached to the main body 2, and a fluid passage portion of the main body 2. 4 is provided with a filter sheet 5 arranged in a wave shape, and an arrow A shown in FIG. 1 is a passage direction of a gas to be filtered.

The main body 2 is provided in parallel with a predetermined interval between a box frame 6 having a predetermined depth in the fluid passage direction and having a rectangular cross section and opposed side plates of the box frame 6. It has a plurality of elongated supports 7. The support member 7 is made of a metal or plastic bar material, and its both ends are box frames 6.
Is fixed to the side plate by caulking, welding, bonding or the like. The support member 7 is not provided at the center of the box frame 6 in the depth direction, but at the filter extension frame 3.
Is aligned with the edge near the insertion side when the is mounted. In FIG. 2, upper and lower guides of a sliding door provided at an opening of a building are provided at upper and lower opposing edges (fixed side of the support member 7) on the insertion side when the filter extending frame 3 of the box frame 6 is mounted. An inner groove (not shown) such as a groove is provided, and the filter extending frame 3 can be mounted in the groove.

[0008] The filter extending frame 3 includes a rectangular frame 8 and
The edge frame 8 has a plurality of elongated pressing members 9 provided in parallel at predetermined intervals between opposing side plates. The outer dimensions of the edge frame 8 are slightly larger than the inner diameter of the box frame 6 of the main body 2 and smaller than the distance between a pair of internal grooves (not shown) provided at the edge of the main body 2. When the mounting frame 3 is mounted on the main body 2 from the direction of arrow B, the sliding door can be inserted into the box frame 6 by mounting the sliding door in the upper and lower guide grooves. The pressing member 9 is formed by forming a metal or plastic rod into a U-shape, and both ends thereof are fixed to the side plate of the edge frame 8 by welding or bonding.

As the filter sheet 5, a sheet made of ion-exchange fiber, a sheet made of activated carbon fiber, a sheet to which activated carbon is attached, a sheet to which activated carbon is added with an adsorbing substance, and the like can be used. Ion exchange fibers can be used as natural or synthetic fibers, such as cation exchange groups such as sulfone groups, or quaternary ammonium groups,
An anion exchange group such as a tertiary amine group or a secondary amine group, which is chemically or physically uniformly adsorbed. Usually, these fibers are formed into a sheet in the form of a woven or nonwoven fabric. To use. Then, depending on the chemical contaminants to be removed, either an cation exchange group or an anion exchange group ion exchange fiber is selected, and both ion exchange fibers are used in some cases. The sheet using the ion exchange fiber is suitable for removing chemical contaminants such as ammonia, fluorine and chlorine. Activated carbon fiber is obtained by physically and uniformly adsorbing fine activated carbon particles on natural or synthetic fibers. The sheet using activated carbon is nitric acid,
Suitable for removing chemical contaminants such as sulfuric acid.

Next, a method of assembling the filter unit 1 as shown in FIG. 1 will be described with reference to FIG. First, as shown in FIG. 3A, a filter sheet 5 obtained by cutting a nonwoven fabric sheet of, for example, ion exchange fibers into a predetermined size is disposed on one surface of the main body 2 (a surface close to the support member 7). The dimensions of the filter sheet 5 are slightly larger than the width of the main body 2 (the longitudinal direction of the support member 7) and slightly larger than the length of the main body 2 in a wavy state. Next, as shown in FIG. 3B, the filter extending frame 3 is mounted on the main body 2 from above the filter sheet 5. At the time of mounting, one edge of the filter extension frame 3 is inserted into one groove of the box frame 6 as shown by an arrow C, and the filter extension frame 3 is attached in a state where the inserted portion is locked. Alternatively, the filter extension frame 3 is mounted in a state where the central portion in the longitudinal direction of the sheet filter 5 is attached to the main body 2. Then, the filter extension frame 3 is dropped into the inner groove of the box frame 6 in the direction of arrow D in FIG. 3C, so that the filter extension frame 3 is attached to the main body 2 and the state of the filter unit 1 in FIG. Assembled.

In order to detach the filter sheet 5 from the filter unit 1 in the state shown in FIG. 1 for regeneration or the like, the filter extension frame 3 is removed in the reverse order of FIGS. The sheet 5 may be taken out. In the filter unit 1 configured as described above, since the size of the filter sheet 5 is set to a value slightly larger than the size of the box frame 6 of the main body 2, a gap is provided between the assembled filter sheet 5 and the edge of the box frame 6. Will not occur. Therefore, even if a special sealing mechanism is not provided, chemical contaminants and the like do not flow out to the outlet side. Further, the filter unit 1 configured as described above is suitably used for filtering a gas having a relatively low wind speed passing through the filter, for example, a gas having a velocity of 0.7 m / s or less. And, if the wind speed in the range of about 0.3~0.7m / s, the basis weight of the ion exchange fibers (woven amount of ion-exchange fibers per 1m ²⁾ 600~1,000g / m ²
One or several filter sheets 5 having a thickness of about one may be used according to the purpose.

[0012]

EXAMPLE The filter unit 1 assembled as shown in FIG. 1 was subjected to an air cleaning experiment on a clean bench by a one-pass chemical filter mounted on a fan filter unit. Incidentally, as the filter sheet 5, a first filter unit 1 of the effective area 1.5 m ² using a cation exchange fiber, the second filter unit 1 of the effective area 1.5 m ² using anion exchange fiber It was arranged in series with the air flow passage. NH ₃ , SO ₄ as chemical pollutants
As a result of introducing air containing about 6 μg / m ^{3 and} operating at an air flow rate of 10 m ³ / s, an ultra-pure air cleanliness of 0.01 μg / m ³ or less at the outlet side is obtained. Was.

[0013]

According to the filter unit of the present invention configured as described above, the filter sheet is waved into the main body simply by mounting the filter extension frame on the main body with the filter sheet in contact with the support member. Be attached. Also, if the filter extension frame is detached from the main body, the filter sheet can be easily removed from the main body. Therefore, the attachment and detachment of the filter sheet is extremely easy, the structure is simple, and the filter sheet can be manufactured at low cost. Also, since the filter sheet can be used by cutting a sheet-like thing into a simple shape,
The production yield from the filter sheet material is good, and the running cost can be kept low. Further, the filter unit of the present invention can flexibly adapt to the target fluid flow rate and pressure loss only by changing the pitch of the support member aligned with the main body and the pitch of the pressing member aligned with the filter extension frame.

[Brief description of the drawings]

FIG. 1 is a schematic partially broken perspective view showing a state where a filter unit of the present invention is assembled.

FIG. 2 is a perspective view showing an example of a main body 2 and a filter extension frame 3 constituting the filter unit of FIG.

FIG. 3 is an explanatory view showing a procedure for assembling the filter unit as shown in FIG. 1;

[Description of Signs] 1 Filter Unit 2 Main Body 3 Filter Stretching Frame 4 Fluid Passing Section 5 Filter Sheet 6 Box Frame 7 Supporting Material 8 Edge Frame 9 Holding Material

Claims (2)

[Claims] 1. A main body 2 in which a plurality of elongated support members 7 are arranged in a box frame 6 having a predetermined depth in a fluid passage direction, and a plurality of elongated holding members 9 which are detachable from the main body 2 and are arranged. A frame-shaped filter extension frame 3, and a filter sheet 5 disposed in the fluid passage section 4 of the main body 2. The filter extension frame 3 is attached to the support member 7 while the filter sheet 5 is in contact with the main body 2. 2. A filter unit characterized in that the holding member 9 is inserted into the back of the supporting member 7 when it is mounted on the supporting member 2, and both sides of the filter sheet 5 are alternately supported by the supporting member 7 and the holding member 9 and held in a wave shape. . 2. The filter unit according to claim 1, wherein the filter sheet is made of ion exchange fibers or activated carbon fibers.