JP2000117034A - Prefilter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a prefilter small in deformation under a condition of a large volume of wind, capable of keeping the interval between filter media in a relatively wide range and adopting relatively thin paper made stabilizers each capable of easily die cutting. SOLUTION: In the prefilter formed by fixing to house a laminated filter medium 3, which is obtained by disposing a reinforcing body 2 on one surface of a long belt like filter medium 1 and folding into corrugated state, in an outside frame 5, which is a paper made box type and has an opening surface support provided with a plurality of openings each having a prescribed shape and formed on each front and rear surface. The laminated filter medium 3, the stabilizer 4 and the outside frame 5 are fixed to one another with an adhesive through the paper made stabilizer 4 formed form a belt like support 4A belt-likely supporting the top part of flow-in side or the flow-out side of the laminated filter medium 3 and a comb-teeth shaped interval keeping part keeping the folded interval of the laminated medium 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-filter for a medium / high performance filter, and more particularly to a primary filter used for a gas turbine intake filter.

[0002]

2. Description of the Related Art Conventionally, as a pre-filter for a medium / high-performance filter, a paper box-shaped pre-filter, as disclosed in Japanese Patent Application Laid-Open No. 8-177524, has a plurality of openings of a required shape on the front and rear surfaces thereof. A pre-filter is used in which an outer frame provided with an opening surface support is provided, and a laminated filter medium that is folded in a wave shape with a reinforcing member attached to one surface of a long strip-shaped filter medium is accommodated.

[0003]

However, in the above-mentioned conventional pre-filter, the pleat spacing of the laminated filter medium is temporarily maintained by an opening surface support which comes into contact with the laminated filter medium. Under the condition of a large amount of air, the pleat interval collapses, and as a result, there is a risk that desired filter efficiency such as a desired collection efficiency and a dust holding capacity cannot be obtained. Generally, as a method of maintaining the interval between the filter media, there is a method of inserting a corrugated separator used in a high-performance filter or the like between the filter media, or a method of fixing the top of the folded filter media with a ribbon material. But,
In the case of the pre-filter of the medium / high-performance filter, the filter medium is not a thin paper but a thick one in which a reinforcing member is added to a long strip-shaped filter medium, so that it cannot be fixed completely and is not adopted. Therefore, Japanese Patent Laid-Open Publication No. Hei 6-343804 discloses that a filter medium is fixed by using a comb-shaped stabilizer. However, this stabilizer is a single plate, and a range in which a filter medium interval can be maintained is small. In order to widen the range, it is necessary to adopt a thick paperboard as a material or take measures such as increasing the number of sheets used per filter. However, there is a problem that it is difficult to perform the die-cutting process on a thick paperboard, and the cost increases as the number of sheets used increases. Further, there is a risk that the stabilizer itself may be significantly deformed under the condition of a large air flow. The present invention has been made in order to solve such a problem, and has a small deformation under a condition of a large air flow, can maintain a distance between the filter media in a relatively wide range, and is relatively thin paper. An object of the present invention is to provide a pre-filter that employs a paper stabilizer that is easily die-cut.

[0004]

According to the present invention, according to the present invention, an opening surface support having a plurality of openings of a required shape is formed on the front and rear surfaces of a paper box. In a pre-filter in which a layered filter medium folded and folded in a wave shape with a reinforcing member attached to one surface of a long band-shaped filter medium is fixedly housed in an outer frame, the entire top of the inflow side or outflow side of the layered filter medium is band-shaped. The stabilizer, the laminated filter medium, and the outer frame are bonded to the adhesive through a paper stabilizer formed from a band-shaped support part that supports the filter medium and a comb-teeth-shaped space holding part that maintains the folded distance of the laminated filter medium. The pre-filter characterized in that the pre-filter is characterized in that the stabilizer is less deformed even under a large air flow condition. Further, the band-shaped support portion also functions to support the filter medium together with the outer frame. Claim 2
As described in the above, in the prefilter according to claim 1,
The above-mentioned stabilizer is obtained by folding paper punched into a symmetrical shape into two in a V-shape, and has the same depth on the inflow side and the outflow side.
Compared with a stabilizer made of a single plate, the filter medium spacing can be maintained in a wide range despite being made of thin paper. According to a third aspect of the present invention, in the pre-filter according to the first or second aspect, the stabilizer has the same depth on the inflow side and the outflow side, thereby reducing costs due to common use of parts. You can also go down.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As the above-mentioned filter medium, a mixed nonwoven fabric of synthetic fibers such as nonwoven reinforced cotton (cotton) and polyester fibers or a nonwoven fabric of synthetic fibers alone can be used.

As the reinforcing member, a metal wire netting such as a galvanized iron wire, a synthetic resin netting such as a tropical net, a nonwoven fabric, or the like can be used. In particular, if the reinforcing member is a synthetic resin net or a non-woven fabric, it is possible to discard by reducing the volume by incineration.

[0007] Before the pleating process, the filter medium and the reinforcing body are laminated and fixed on the outflow side of the filter medium with an adhesive.

The outer frame is made of water-resistant paper used for drinking water packs and the like, and coated balls (two paperboards coated with resin on one side are adhered and laminated so that the resin-coated surface is on the outside to make them water-resistant. Are particularly preferable). The outer frame is provided with an opening support having a plurality of openings of a desired shape such as a rhombus so as to support the filter medium on both the inflow side and the outflow side.

As the stabilizer, as in the case of the outer frame, a water-resistant paper frame used for a drinking water pack or the like, a coated ball (adhesive lamination of two paperboards each having a resin coating on one side such that the resin coating surface is on the outside). Water-resistant). In addition, the stabilizer is formed of a band-shaped support portion that supports the top of the laminated filter medium on the inflow side or the outflow side in a band shape, and a comb-shaped interval retaining section that maintains the folded interval of the laminated filter medium, and is symmetrical. This is a sheet of paper that has been punched out in a different shape and is folded in half, and the inflow side and the outflow side have the same depth. The band-shaped support portion is bent perpendicularly to the comb-shaped interval holding portion to support the filter medium together with the outer frame. The band width of the band-shaped support portion is 5 to 15 mm, and the tooth height of the comb-shaped space holding portion is 20 to 1
00mm, tooth spacing 1-15mm, tooth bottom width 10-3
0 mm, and the width of the tooth top is 5 to 25 mm.

[0010] The filter medium, the stabilizer, and the outer frame are hermetically sealed by being bonded to each other with an adhesive such as starch paste.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view of a prefilter of the present invention, and FIG. 2 is a developed view of a stabilizer used in the prefilter of the present invention.

The prefilter of the present invention has a ridge height of 95 mm formed by laminating a long strip-shaped filter medium 1 made of a polyester fiber filter medium and a reinforcing body 2 made of a galvanized iron wire mesh with an adhesive and bending the zigzag shape. The stacked filter media 3 having 22 folds are held at upper and lower portions by a stabilizer 4 or 7 made of a coated cardboard having a thickness of 1 mm from the outflow side and the inflow side, respectively. It is stored and fixed by outer frames 5 and 6.

As shown in FIG. 4, the box-shaped outer frames 5 and 6 are made of a single sheet of water-repellent paperboard with two sheets of 310 g / m ² paperboard laminated with the resin-coated surface facing outward. Cardboard 4
The corners are notched, and the corners 5b, 6b formed by the ears are asymmetrical in the box-shaped outer frames on the outflow side and the inflow side. Air leaks can be prevented by combining as much as possible.

The basic openings of the opening surface support portions 5c and 6c are diamond-shaped in consideration of the supportability of the filter medium, the strength of the frame, the securing of the filtration area, and the prevention of appearance defects due to the exposure of the stabilizer.

The stabilizers 4, 7 are formed by punching a single plate, and the band widths 4a, 7a of the band-shaped support portions 4A, 7A are 1
1.5 mm, tooth height 4 of comb-tooth-shaped space holding portions 4B, 7B
b and 7b are 50 mm, tooth spacings 4c and 7c are 21 mm, tooth bottom widths 4d and 7d are 7 mm, and tooth top widths 4e and 7e are 8 m.
m, forming 21 interval holding portions at a pitch of 28 mm,
It was folded in two at the line of symmetry.

As a result of a pressure test of a filter having the above specifications,
It was confirmed that the stabilizer of the above specification also maintained the filter medium spacing without deformation.

[0017]

(1) Since the stabilizer and the outer frame are fixed by an adhesive and the belt-like support portion for supporting the top of the laminated filter material in a belt shape is provided, the space between the stabilizer and the filter material is deformed even under a large air flow condition. Less is. (2) A conventional stabilizer can be obtained by folding the stabilizer into a symmetrical shape and folding the paper into two in a V-shape.
Compared with a stabilizer made of a single plate, the filter medium spacing can be maintained in a wide range despite being made of thin paper. (3) If the depths of the stabilizers on the upstream and downstream sides are the same, the productivity is improved by using a common punching die.
Further, the material cost of the stabilizer can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a prefilter of the present invention.

FIG. 2 is a development view of a stabilizer used in the prefilter of the present invention.

FIG. 3 is an enlarged sectional view of a stabilizer used in the prefilter of the present invention.

FIG. 4 is a development view of an outer frame used in the prefilter of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filtration material made of polyester fiber (long band-shaped filtration material) 2 Wire mesh made of galvanized iron wire (reinforcing body) 3 Laminated filtering material 4 Stabilizer 4A Band-shaped support portion 4a Band width 4B Comb-shaped interval holding portion 4b Tooth height 4c Teeth interval 4d Tooth bottom Width 4e Tooth upper width 5 Outer frame 5a Ear 5b Corner 5c Open surface support 6 Outer frame 6a Ear 6b Corner 6c Open surface support 7 Stabilizer 7A Band support 7a Band width 7B Comb tooth spacing holder 7b Tooth height 7c Tooth spacing 7d Tooth bottom width 7e Tooth top width

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Fumio Nakajima 415, Sakunodani, Yuki-shi, Ibaraki Prefecture F-term in the Yuki Plant of Nippon Inorganic Corporation 4D058 JA14 JB13 JB14 JB25 KA01 KA06 KA23 KC28 KC54 SA20

Claims (3)

[Claims] A reinforcing member is provided on one surface of a long strip-shaped filter material in an outer frame formed in a paper box shape and having an opening surface support having a plurality of openings of a required shape on the front and rear surfaces thereof. In a pre-filter in which a laminated filter medium folded and folded in a wave shape is fixed and accommodated, a band-shaped support portion that supports a top portion on the inflow side or the outflow side of the laminated filter medium in a band shape, and a comb that maintains a folded interval of the laminated filter medium. A pre-filter, wherein the laminated filter medium, the stabilizer, and the outer frame are fixed to each other with an adhesive via a paper stabilizer formed from the tooth-shaped space holding portion. 2. The pre-filter according to claim 1, wherein said stabilizer is formed by folding a sheet punched into a symmetrical shape into two in a V-shape. 3. The stabilizer according to claim 1, wherein the inflow side and the outflow side have the same depth.
The described prefilter.