JP2001179010A - Filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter constituted so that the passing resistance of a fluid and a rise of pressure loss are reduced, filtering capacity is kept for a long period of time and a perforated cylindrical body can be reused. SOLUTION: In a filter equipped with a perforated cylindrical body, the filter medium mounted on the outer periphery thereof and the end plates provided to both end parts of the perforated cylindrical body, the filter medium is constituted of an almost cylindrical body having a honeycomb structure wherein fluid passing parts having depth in a radial direction are provided from a large number of strip-like sheets made of a nonwoven fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a cylindrical filter used in a device for filtering fluid such as gas and liquid.

[0002]

2. Description of the Related Art As this kind of filter, a filter having a so-called pleated filter, in which a single nonwoven fabric sheet is folded to increase its surface area, is generally used on the outer periphery of a perforated cylindrical body. .

[0003] However, this type of filter has a structure in which a substance to be filtered in the fluid is filtered by impinging and passing the fluid in the thickness direction of the filter medium, so that the resistance to the passage of the fluid is increased and the substance to be filtered is filtered. There is a problem that clogging is likely to occur due to being trapped inside the material, pressure loss increases in a relatively short period of time, and the service life is short.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and has a low fluid passage resistance, a small increase in pressure loss, and a long-term maintenance of filtration performance. Another object of the present invention is to make a perforated cylindrical body reusable.

[0005]

A filter according to the present invention comprises a perforated cylindrical body, a filter material mounted on the outer periphery thereof, and end plates provided at both ends, wherein the filter material is used. It is characterized in that it is a substantially cylindrical body having a honeycomb structure in which a plurality of strips of nonwoven fabric and a fluid passage portion having a depth in the radial direction are continuously provided.

According to this means, the fluid introduced into the perforated cylindrical body from the inflow port of one end plate has a honeycomb structure in which a fluid passage portion having a depth is continuously provided from the fine holes of the perforated cylindrical body. Since the gas passes through the filter, the passage resistance is reduced, and an increase in pressure loss is prevented.

In the present invention, when a perforated plate or net made of metal or synthetic resin is formed into a cylindrical shape as the perforated cylinder, the perforated cylinder can be reused.

In this case, the size and porosity of the micropores of the perforated cylindrical body are within a range of 0.5 to 10 mm in diameter, in consideration of the passage resistance, the collecting property of the material to be filtered, and the like. 50%
Is more preferable, more preferably in the range of 2 to 5 mm in diameter, and in the range of 30 to 40%.

[0009]

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, a filter F has a perforated tubular body B detachably mounted inside a substantially cylindrical filter medium A having a honeycomb-shaped fluid passage portion E, and upper and lower end plates at both ends. C and D are attached. The upper end plate C is a disk-shaped object having an inflow port in the center, and the lower end plate D is a disk-shaped object having a convex cross section and fitted to the lower end of the perforated cylindrical body B.

The filter material A is formed by joining a number of strips made of non-woven fabric to each other at a joining portion a in which each of the adjacent front and back surfaces extends in the radial direction, and non-joining with an opposing joining portion a. This is formed into a cylindrical body having a honeycomb structure in which a fluid passage section E partitioned by a section c is provided continuously.

That is, as shown in FIG. 2, the filter material A is made of a nonwoven fabric sheet 1 having a required width and length.
2. . . n are sequentially overlapped, and the adjacent odd-numbered
The even-numbered joint portion a and the even-numbered-odd-numbered joint portion b were joined at the same pitch, and the joining positions were joined at a predetermined pitch to form a substantially bellows-like stacked sheet. Thereafter, the sheets can be formed by integrally bonding the sheets on both sides of the stacked sheet with an adhesive or the like. By the way, the above-mentioned joining portions are provided at the same length as the width of the belt-shaped sheet and are provided at regular intervals in the longitudinal direction of the sheet. As a joining means, known means such as adhesion and fusion can be used.

In this case, a desired cross-sectional area of the fluid passage portion E can be obtained by appropriately changing the width and the joining pitch of the joining portion.

The size of the nonwoven fabric band-shaped sheet is not particularly limited, but it is preferable to use a wide sheet since the depth becomes deep and the total filtration surface area of the fluid passage section can be increased. It is.

The nonwoven fabric sheet may be any of spunbond, meltblown, heat-sealed, and composite products of these. Further, if an electret-processed sheet is used, the filtration efficiency can be improved. Can,
In addition, when a material subjected to adhesive processing is used, fine dust and insects in the fluid can be efficiently removed.

Further, the material of the fibers constituting the nonwoven fabric of the belt-shaped sheet is not particularly limited. However, in consideration of the ease of forming the joint portion and the point of not absorbing oil or moisture, polypropylene, polyester, etc. A thermoplastic synthetic fiber such as nylon, polyethylene or the like is used alone or in combination of two or more.

Next, the perforated cylindrical body B has a diameter of 3 m.
m, a stainless steel pipe having a porosity of 30% was used, but the present invention is not limited to this.

Although not shown, a porous cylinder made of metal or synthetic resin or a porous cylinder made of a nonwoven fabric sheet is provided on the outer peripheral side of the filter medium A in consideration of improvement in filtration efficiency. Sometimes.

[0019]

According to the first aspect of the present invention, the fluid in which the fluid introduced from the inlet of one of the end plates into the inside of the perforated cylindrical body has a fluid passage portion connected to the micropores of the perforated cylindrical body is provided. Since it passes through the filter medium having the structure, the passage resistance becomes small, a sharp rise in pressure loss can be prevented, and the service life can be greatly extended. According to the invention of claim 2, the perforated cylinder can be reused by replacing only the filter medium.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a filter of the present invention.

FIG. 2 is a partially enlarged perspective view in which a filter medium is developed.

FIG. 3 is a perspective view of a perforated cylindrical body.

[Explanation of symbols]

 F: Filter A: Filter material B: Perforated cylinder C: Upper end plate D: Lower end plate E: Fluid passage part 1, 2, 3,. . . n: Non-woven fabric strip a, b: Joined part c: Non-joined part

Claims (2)

[Claims] 1. A filter comprising a perforated cylindrical body, a filter material attached to the outer periphery thereof, and end plates provided at both ends, wherein the filter material is a multi-layered nonwoven fabric sheet. And a substantially cylindrical body having a honeycomb structure in which fluid passage portions having a depth in a radial direction are continuously provided. 2. The filter according to claim 1, wherein the perforated cylinder is a perforated plate or net made of metal or synthetic resin.