JP2003071222A - Filter element and filter unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter element which enough utilizes the energy of air for removing dust by minimizing the resistance of air during filtration while keeping strength, maximizes the effective area of a filter, prevents clogging by enlarging each through hole, and has a shape to facilitate the production of the entire filter element and a filter unit using the filter element. SOLUTION: The filter element 10S in which interval holding parts 10N are protruded in parallel to through holes 10M is formed in one side part of a plate-shaped body 10' formed by arranging a plurality of the through holes 10M. A plurality of the filter elements 10S are bonded, welded, or integrally molded while being laminated with the interval holding parts 10N arranged in the same direction to constitute the filter unit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-supporting type filter element which can be backwashed, and a filter unit constructed by using this filter element.

[0002]

2. Description of the Related Art A backwashable self-supporting filter element and a filter unit constructed by using this filter element are conventionally described in, for example, Japanese Patent Publication No. 7-83810. 2 and 3 thereof, there is a description of a filter body constituted by stacking a plurality of plate-like breathable filters, and FIG. 10 thereof shows the same. A filter device using a filter body is described.

The structure of the filter element constituting the filter body and the filter device will be described in more detail. The filter element is formed from one end surface of the facing end surface of the plate-like body made of air-permeable porous material to the other end surface thereof. A plurality of holes are formed through the plate-shaped body, and the inner wall surfaces of the plurality of holes are formed in a mountain shape toward the side wall surfaces of the plate-shaped body that are adjacent to each other. The structure is durable against external pressure applied to the filter when cleaning the filter.

[0004]

However, in the conventional filter element described in the above publication, as shown in the sectional views shown in FIGS. 4 to 8 of the publication, each hole 55 is formed. When air goes out from the plate-shaped body 52 to the outer wall of the plate-shaped body 52, since the wall thickness of the plate-shaped body 52 is different, the air resistance of the thick wall portion increases and the pressure loss increases. However, there is a problem that stable performance cannot be maintained as a filter element and a filter unit. Also, each hole 55 formed in each filter element
As shown in the figure, since the hole shape is made smaller than the wall thickness of the filter element, there is a problem that when used in a place where the amount of dust is large, it is immediately clogged.

Further, the conventional filter element and filter unit described above are each plate-shaped in order to form the clean gas passages 62 between the plate-shaped bodies 52 ... As shown in FIG. 1 and FIG. The ribs 58, 58 protruding along the edges of the end faces 53, 54 of the body 52 are formed long in the directions (perpendicular directions) orthogonal to the penetrating direction of the holes 55. Ribs 58, 58 and holes 55
When the plate-like body 52 is manufactured,
There is a problem in that molding in one step such as pultrusion molding or extrusion molding becomes impossible, and as a result, the number of processing steps increases, the manufacturing work becomes difficult, and the manufacturing cost increases.

In addition, in the above-mentioned conventional filter element and filter unit, the clean gas passages 62 formed between the laminated filter elements 51 are made extremely narrow as shown in FIG. Is formed by a right-angled edge, so that when the dust removal air is blown from the clean gas passages 62 to remove the dust adhering to the filter element 51, the resistance coefficient against the inflow of the dust removal air is large. There is also a problem that the energy of the dust removing air is attenuated.

Therefore, the technical problem of the present invention is to make the air resistance at the time of filtration as small as possible while maintaining the strength so that the energy of the dust-removing air can be fully utilized, while the effective area of the filter is increased. A filter element having a shape that facilitates the manufacture of the entire filter while increasing the size of each through-hole to prevent clogging by increasing the size of each through-hole, and a filter unit configured by using this filter element. Is to provide.

[0008]

[Means for Solving the Problems] Means taken in the present invention for solving the above technical problems are as follows.

(1) A filter element in which a large number of through-holes are formed from one end face of an opposing end face to the other end face of a plate-like member made of a gas permeable porous material. A rib-shaped or padding-shaped space holding portion is provided on at least one surface of one side portion in parallel with the through hole and in the plate thickness direction of the plate-shaped body. (Claim 1)

(2) The other end portion of the plate-like body on the opposite side of the one side portion on which the interval holding portion is provided is formed into a chamfered shape in which the plate thickness is gradually reduced. (Claim 2)

(3) The cross-sectional shape of each through hole provided in the plate-like member is formed into a square shape of a substantially quadrangular shape or a substantially octagonal shape, and each through hole serving as a passage for dust-containing air and a filter element. The thickness of the wall surface that constitutes the surface of the is formed to be substantially uniform and thin along the through hole. (Claim 3)

(4) The cross-sectional size of each through hole is
The dimension of the short side of the through hole is at least 7 mm or more, and the value obtained by dividing the dimension of the through hole by the dimension of the short side of the hole is at least 4 mm.
Be configured to be 0 or less. (Claim 4)

(5) A large number of through-holes are formed side by side on one side of the plate-like body made of a gas permeable porous material from one end face of the opposite end to the other end face. , A filter element formed by projecting rib-shaped or build-up space-holding portions in parallel with the through-holes and in the plate thickness direction of the plate-shaped body, the position of each space-holding portion Assembling by stacking a plurality of sheets in parallel so as to be in the same direction, and sealing the gaps between both end portions orthogonal to the gap holding portion among the gaps between the filter elements arranged in parallel. (Claim 5)

(6) A large number of through holes are formed side by side from one end face of the opposite end to the other end face of a plate-like body made of a gas permeable porous material, and at one side of the plate-like body. , A filter element formed by projecting rib-shaped or build-up space-holding portions in parallel with the through-holes and in the plate thickness direction of the plate-shaped body, the position of each space-holding portion Integrally molded in a state where multiple sheets are stacked so that they are in the same direction,
Among the intervals of the filter elements integrally formed with each other, the intervals between both end portions orthogonal to the interval holding portion are sealed and assembled, or the sealing is configured at the same time when integrally molded. thing. (Claim 6)

(7) An interval between the filter elements arranged in parallel is used as a flow passage for the filtered air and the dust-removing air, and at least one port or both ports of each through hole provided in each filter element is treated as a dust-containing member. The air inlet and the dust removing air are used, and the chamfered shape of each filter element that gradually thins the thickness of the filter element is used for the filter air outlet and dust removing. Use as an air inlet. (Claim 7)

(8) The spacing holding portion formed on one side of the filter element is formed by either ribs, padding or sealing, and the stacked filters are sealed by these spacing holding portions. Configure the cross-sectional area of the slit spacing on one side of the element to seal at least 60% or more. (Claim 8)

According to the first aspect of the present invention described in (1) above, the plurality of through holes and the space holding portions provided in the plate-like body forming the filter element are formed in parallel relationship with each other. Therefore, since the through hole and the spacing member can be simultaneously formed by a single drawing or extrusion molding, the filter element can be manufactured relatively easily and at a low cost. Further, in the case of the rib-shaped space maintaining portion, it is possible to prevent blowout of the dust removing air and effectively use the energy of the dust removing air for removing dust.

According to the second aspect of the invention described in (2) above, when the plate-like members are stacked, the chamfered shape formed at the tip of the plate-like members causes the inside of the flow passage to be cleaned when the filter is cleaned. The dust removal air that is blown into the air can easily enter, and clogging of the filter can be effectively eliminated. Also,
The chamfered shape is formed in the same direction as the through hole and the spacing member, at the time of drawing or extrusion molding of the plate-shaped body, because it can be molded together with the through hole and the spacing member, This makes it possible to manufacture a filter element having a through hole, a space holding portion and a chamfered shape relatively easily and at low cost.

According to the third aspect of the invention described in (3) above, since the through hole is formed in a mechanically strong rectangular shape having a substantially square cross section or a substantially octagonal cross section, the backwashing dust remover is provided. Sufficient strength can be exhibited against external pressure such as blowing of air. Further, since the wall thickness of each through hole and the wall surface forming the surface of the filter element can be formed to be substantially uniform and thin so that the effective area of the filter can be increased, the size of the filter element can be reduced. And the air resistance during filtration is reduced as much as possible,
It enables stable filtration performance as a filter element.

According to the means of claim 4 described in (4) above, the energy of the injected dust removing air has a large cross-sectional area of the through hole, that is, the short side dimension of the through hole is at least small. 7 mm or more, hole length dimension / hole short side dimension = 40
By the following, the adhering dust inside each through hole is carried out to the outside of the hole without being attenuated, so that it is possible to exhibit an excellent dust removing effect. Further, since the diameter of the hole is large, it can be used without clogging even when used in a waste treatment facility that handles high-concentration waste dust.

According to the means according to claims 5, 6, and 7 described in the above (5), (6), and (7), a plurality of filter elements are superposed with the direction of the spacing portions thereof being the same. The air flow containing dust, which was welded or adhered, or integrally molded, and flowed from the dust-containing air flow inlet of each through hole, was filtered through the wall of the element, and was formed by the protrusion of the space holding portion. It exits through an unsealed outlet through a clean air flow passage. Further, in order to scavenge the dust adhering to the filter element, the dust-removing air for backwashing blown into the flow passage from the above-mentioned blow-out port also serving as the flow outlet passes through the wall of the element surrounding each through hole. After that, since it is discharged to the outside from the exhaust port that also serves as an air inlet through each through hole, it is possible to backwash the dust adhering to the wall of each through hole and remove it. A compact and high-performance filter combining the excellent strength, functionality, and filtration performance of the filter element described for each of the means (1), (2), (3), and (4). Allows you to provide a unit.

According to the means according to claim 8 described in the above (8), it is possible to simplify the labor when superposing a plurality of filter elements. That is, it is most desirable that the upper surface of the space holding portion formed on each filter element and the bottom surface of the filter element (plate-shaped body) to be overlapped with the space holding portion are completely in contact with each other to completely close the space. Since the height is not always made constant, it needs to be made slightly smaller. As a result, a slit-like space is generated between the space holding portion and the bottom surface of the filter element. However, this space is 60% or more of the space between the filter elements, and the space for dust removal is Since it does not have a large effect on the blow-off effect, it is possible to simplify manufacturing and assembling by superimposing and adhering or welding each filter element in anticipation of this gap, or by integrally molding. It is possible to change.

As described above, the above (1)-
The technical problems described above can be solved by the means described in (8), and the problems of the conventional technology can be solved.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a filter element and a filter unit according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a filter element 10S according to the present invention, and FIG. 2 is shown in FIG. FIG. 3 is a perspective view showing a filter unit 10 according to the present invention, which is formed by stacking a plurality of vertically stacked filter elements 10S, with a part thereof omitted.
As shown in the drawing, a plurality of through-holes 10M ... Are provided side by side in a plate-shaped body 10 'made of a gas permeable porous material such as a ceramic material from one end face to the other end face facing each other. On one surface of one side of the body 10 ',
The plate-like body 1 is parallel to the through hole 10M and is parallel to the through-hole 10M.
Rib-shaped or padding-shaped space holding portion 10 in the 0'thickness direction
N is protruded, and the tip portion 10K of the plate-shaped body 10 'is further formed into a chamfered shape whose plate thickness gradually becomes smaller. In addition, in order to provide the space holding portion 10N, a filling material for plugging may be poured out and formed on one surface of the plate-shaped body 10 ', and the method for forming the space holding portion 10N is arbitrary.

As shown in the figure, the through holes 10M are structurally strong and have a substantially octagonal cross section (honeycomb shape) or a substantially quadrangular cross section, and the through holes 10M and the surface of the filter element are formed. The wall thickness of the wall surface is made substantially uniform along the through hole 10M, and is also thin.
In addition, since the interval holding portion 10N and the chamfered tip end portion 10K, including the through holes 10M, are all formed in the same direction and in parallel, the plate-shaped body is pulled out by a pulling machine or an extrusion machine. By using a processing machine such as a machine, the filter element 10S including the plurality of through-holes 10M ... And the spacing holding portion 10N and the chamfered tip portion 10K can be easily formed at one time. .

Incidentally, FIG. 8A shows the structure of the through hole 10M formed in a substantially octagonal cross section, and FIG. 8B shows the structure of the through hole 10M formed in a substantially square cross section. . In these drawings, the symbol L indicates the dimension of the short side of each of the through holes 10M formed in the above rectangular shape,
Further, Table 1 below shows the amount of blown air (dust removal air amount) with respect to the size of the through hole 10M, the filter pressure loss,
The relationship with the drop-off rate is measured and expressed based on experiments.

[Table 1]

From Table 1, the size of the cross section of each through hole 10M is set to be at least "40" or less by dividing the size of the hole length by the size of the short side of the hole (above L). If you do
It turned out that an excellent effect is exhibited. In addition, Table 1 above
The value of is a value when one opening of each through hole 10M is opened and the other opening is closed, and is "80" or less when both openings are opened.

The filter unit 10 shown in FIG.
A plurality of filter elements 10 configured as described above
S ... are vertically stacked so that the positions of the space holding portions 10N provided on one side are in the same direction, and these are adhered or welded to be integrated, or the whole is integrally formed. And each interval holding portion 10N
Each filter element 10S formed by ...
(Space) is a flow passage 10 for filtered air and dust removal air.
It is H (see FIG. 3). In addition, the both ends of each flow passage 10H of each of the stacked filter elements 10S ...
A filling material such as ceramics is embedded by about 10 mm for sealing, respectively, and both ends or one end of each unsealed through hole 10M ... The mouth of the flow passages 10H on the side where the space holding portions 10N between the filter elements 10S are not provided, that is, the chamfered tip portion 1 is formed.
The port 10B on the side where 0K ... Is provided is configured to serve as an outlet for filtered air and an inlet for dust removal air.

Further, in FIG. 2, 11A and 11B are filter elements 10S stacked vertically as described above.
Shows the ceiling and bottom plate that are attached to both the upper and lower sides of. Also, FIG.
In (a), the dust-containing airflow sent into each through hole 10M ... Of each filter element 10S assembled as shown in FIG. 2 is filtered by passing through the wall surface sandwiching the through hole 10M and the flow passage 10H, Next, the filtered air is discharged from the outlet 10B to the outside of the filter unit 10 through each of the flow passages 10H, and shows a state during dust collection operation. Dust removal air for backwashing is blown into the flow passages 10H ... From the blow-in port 10B which also serves as an outflow port, and dust adhering to the wall surface of each filter element 10S passes through each through hole 10M. The figure shows the state during the dust removal operation in which one end is discharged to the mouth side.

Further, FIG. 4 is a front view of the filter unit 10 constructed as described above, and FIG. 5 is a partial cross-sectional side view of the filter unit 10.
9 has a structure that is used by being incorporated in the dust collecting apparatus generally indicated by reference numeral 1 in FIGS. 9 and 10.

Next, FIG. 6 shows the filter unit 10 described above.
FIG. 20B is a perspective view for explaining the assembled state of FIG.
Is a plug made of a filling material such as ceramics that closes the left and right ends of each flow passage 10H between the filter elements 10S that are vertically stacked, and each flow passage 10H ...
The space is supported by the space holding portion 10N described above and the left and right plugs 20T, 20T.

In order to assemble the filter unit 10 by vertically stacking the filter elements 10S ... As shown in FIGS. 2 to 5, the filter elements 10S ...
The spacers 30, 30 each having a thickness of about 3 mm are interposed between the filter element 10S and the upper and lower top plates 11A and bottom plates 11B, respectively.
After filling the above-mentioned filling material into the both ends of each flow passage 10H maintained by 30 and sealing 20T, 20T, waiting for drying and pulling out each spacer 30, 30, the parallel flow passages can be formed. The filter units 10 can be assembled by laminating the respective filter elements 10S ... With a space of 10H. The respective laminated filter elements 10S.
It is designed to be integrally bonded by.

Each filter element 10S includes a space holding portion 10N, each through hole 10M ..., And a tip portion 10.
Because all the chamfered shapes of K are formed in the same direction, not only can each filter element 10S be manufactured in one step by drawing or extrusion molding, but also a plurality of filter elements 10S ... It is possible to form a stack of the flow passages 10H ... In a state where the flow passages 10H are opened at a time by the above-mentioned molding method.
If T, 20T, the filter unit 1 shown in FIG.
0 can be easily assembled.

Further, according to the present invention, when the filter elements 10S are laminated, they are formed in a rib shape or a built-up shape, or a space holding portion of each filter element 10S constituted by a plug 20T. Since there is variation in the dimension of 10N, taking into account this variation in advance, the spacing 10Na between the equal spacing holding portion 10N and the bottom surface of the filter element 10S (FIG. 2, FIG. 3,
Slit spacing W (see FIGS. 5 to 7) (see FIG. 7)
The cross-sectional area of the filter element is configured to be sealed by at least 60% or more with respect to the cross-sectional area of the slit spacing W, thereby facilitating the stacking work and process of each filter element 10S. In FIG. 7, 11K is a cover for preventing air leakage, 11P and 11P are packings for attaching the cover 11K, 11D is a spacing member provided on the bottom plate 11B, and 11C in FIG. 6 is this spacing member 11D. It is a holding unit instead of.

Table 2 below shows the above-mentioned space holding portion 10N.
It is a test result which is a table showing a comparison between a blocking degree (%) of a slit interval which is blocked by a (rib) and a degree of a filter pressure loss at the time of injecting dust removal air.
It has been found that blocking by about 60% has the same effect as that by blocking by 100%.

[Table 2] Needless to say, when the slit spacing W is set to 0 and 100% closed, the dust-removing air does not blow through, and the dust can be effectively removed. However, the 100% blockage makes it difficult to manufacture and assemble it, resulting in high cost.

9 and 10 are a side view and a plan view of a multi-stage type dust collecting apparatus using the filter unit 10 according to the present invention described above, and in these drawings, reference numeral 1 respectively.
The inside of the dust collector main body shown in FIG.
Is divided into two chambers, the dust chamber 3A and the clean chamber 3B, which are arranged side by side, and an inlet 4 to which a suction duct for dust-containing airflow is connected is provided on the upper surface of the dust chamber 3A, and the upper surface of the clean chamber 3B. Is provided with an exhaust port 6 to which an exhaust duct is connected. 1H is a hopper provided at the bottom of the dust chamber 3A.

As shown in FIG. 9, a plurality of filter mounting holes (not shown) for mounting a plurality of filter units 10 according to the present invention on the intermediate partition wall 2 described above.
Are opened at intervals in the vertical direction and in the horizontal direction, and each filter unit 10 ... Is provided in a state of protruding to the inside of each filter mounting port, that is, the dust chamber 3A side as shown in FIG. It is attached inside the filter support member 11 having a substantially box structure.

Further, the filter unit 1 according to the present invention
As shown in FIG. 0, the openings of the through holes 10M ... Opened on both sides inside the filter support member 11 face openings (not shown) provided on the left and right side surfaces of the filter support member 11, respectively. Further, the respective outlets 10B of the outflow port and the blow-in port, which are open to the front, are attached so as to face the filter attachment ports. In the figure, reference numeral 12 denotes a shield plate provided on the intermediate partition wall 2 so as to face the mouths of the through holes 10M ... so as to shield between the filter units 10 ...

Further, in FIGS. 9 and 10, 10H '...
Is a filter inspection cover which is attached to the surface of the intermediate partition wall 2 on the clean room 3B side so as to close the filter mounting port, or which is detachably mounted. Each of these filter inspection covers 1
Venturi pipes 10V for blowing dust removal air, which also serve as exhaust pipes for filtered air, are provided at 0H 'so as to project toward the clean room 3B.

Further, in the figure, 5 ... is a straightening plate provided in the dust chamber 3A, 13 ... is an injection pipe of dust removal air (compressed air) piped inside the cleaning chamber 3B so as to face the respective venturi pipes 10V. (Plow tube), 13A ... Injection nozzles, 14 and 15 compression tanks containing dust removal air, 1
4T and 15T are electromagnetic on-off valves, 13S ... are each injection pipes 1
The flow-blocking stoppers 3 are provided so that the destinations of the dust-removing air supplied from the left and right tanks 14 and 15 are determined by the positions of these blocking plugs 13S. Further, 7 is an opening / closing door for inspection which is openably / closably attached to the front opening of the clean room 3B provided in the dust collector main body 1, and 7T ... Shows a handle for opening / closing provided on the opening / closing door 7, which is used for checking the filter. Lid 10
When the H'is opened to inspect the filter unit 10 according to the present invention, the opening / closing door 7 is opened.

Since the filter element and the filter unit according to the present invention are constructed as described above, the space holding portion 10N of the filter element 10S, the plurality of through holes 10M ..., And the chamfered tip portion 10K.
Are formed in a parallel relationship with each other, it is possible to simultaneously form the space holding portion 10N, the through hole 10M, and the tip portion 10K by one-time drawing or extrusion molding, and the through holes 10M ... Size and through hole 10
Since the wall surface sandwiching M and the flow passage 10H can be formed to have a substantially uniform wall thickness, the strength of the filter element 10 is stable.
S can be provided.

Further, in the pultrusion molding or extrusion molding of the filter element 10S, the above-mentioned chamfered tip portion 10K can be molded at the same time, and the chamfered tip portion 10K is formed in the filter element 10.
When removing dust adhering to S, it has a shape that allows easy entry of dust removal air and can reduce loss due to air resistance, so dust is effectively removed from the filter element 10S and clogging is reliably eliminated. can do. In addition, each of the through holes 10M described above is formed in a square shape having a substantially quadrangular or substantially octagonal cross section, and the wall surface thereof is formed uniformly and thinly along the through holes 10M, so that filtration is performed. The air resistance at the time can be made as small as possible to exhibit stable filtration performance, and also exhibit excellent strength against external pressure.

Further, the filter unit 10 constructed by vertically stacking the filter elements 10S having the above-mentioned structure has an excellent function in which the respective characteristics of the filter elements 10S described above are integrated.
It is possible to provide a compact filter unit 10 that is easy to manufacture and has excellent strength and filtration performance.

[0044]

As described above, according to the filter element and the filter unit according to the present invention, it is possible to obtain a filter element having excellent strength and filtration performance, although the manufacturing and assembling are easy and the manufacturing cost is low. A filter unit can be provided, which can be applied to a dust collector having various structures to exhibit an excellent filtering function and dust removing function.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional plan view of a filter element according to the present invention.

FIG. 2 is a perspective view of a filter unit configured by stacking the filter elements shown in FIG.

FIG. 3A is a plan view illustrating the flow of filtered air in the filter unit during dust collection operation, and FIG. 3B is a plan view illustrating the flow of dust removal air in the filter unit during dust removal operation. Is.

FIG. 4 is a front view of a filter unit according to the present invention.

FIG. 5 is a partial cross-sectional side view of the filter unit according to the present invention.

FIG. 6 is an inclined view illustrating a state in which a filter unit is assembled using the filter element according to the present invention.

FIG. 7 is a side view illustrating the assembled filter unit with a part of the structure omitted.

FIG. 8A is a partially enlarged view of a filter element having a through hole formed in a substantially octagonal cross section, and FIG. 8B is a partially enlarged view of a filter element having a through hole formed in a substantially square cross section.

FIG. 9 is a side view showing the whole of a multi-stage dust collector incorporating the filter unit according to the present invention.

FIG. 10 is a plan sectional view of an essential part of a multi-stage dust collector in which a filter unit is also incorporated.

[Explanation of symbols]

1 Multi-stage dust collector 10 Filter unit 10 'Plate-like body 10S Filter element 10K Tip part 10M Through hole 10N Space holding part 10H consisting of rib, padding and plugging 10H Flow passage for filtered air and dust removal air 10B Filtered air Air outlet and air inlet for dust removal 10Na Space between the space holding part and the bottom surface W Slit space 20T Sealing

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tetsumi Tetsumi             1-6-2 Shintoda Hamamatsu City, Shizuoka Prefecture Amano Co., Ltd.             Ceremony company Miyakoda Techno Business Office (72) Inventor Takumi Seo             1-6-2 Shintoda Hamamatsu City, Shizuoka Prefecture Amano Co., Ltd.             Ceremony company Miyakoda Techno Business Office (72) Inventor Keiichiro Suzuki             426-1 Kakuda, Aikawa-cho, Aiko-gun, Kanagawa Prefecture Asahi Glass             Child Sagami Office (72) Inventor Takashi Hamada             426-1 Kakuda, Aikawa-cho, Aiko-gun, Kanagawa Prefecture Asahi Glass             Child Sagami Office F-term (reference) 4D058 JA01 JA12 JB06 JB28 JB39                       KA08 KA14 KA15 KB11 KC62                       MA15 MA22 QA17

Claims (8)

[Claims] 1. A plate-shaped body made of a breathable porous material,
A filter element formed by arranging a large number of through holes from one end face of the opposite end face to the other end face, wherein the filter element is formed on at least one surface of one side portion of the plate-like body in parallel with the through hole. A filter element characterized in that rib-shaped or padding-shaped space holding portions are provided so as to project in the plate thickness direction of the plate-shaped body. 2. A chamfered shape in which the other end portion of the plate-like body on the opposite side of the one side portion provided with the protruding space-holding portion is chamfered so that the plate thickness gradually becomes smaller. The filter element according to claim 1. 3. The through-holes formed in the plate-like body are formed in a rectangular shape or a square shape of a substantially octagonal shape, and each of the through-holes and the filter element serving as a passage for dust-containing air is formed. 2. The filter element according to claim 1, wherein the wall surface constituting the surface is formed to be substantially uniform and thin along the through hole. 4. The size of the cross section of each through hole is such that the dimension of the short side of the through hole is at least 7 mm or more, and the value obtained by dividing the dimension of the through hole by the dimension of the short side of the hole is: The filter element according to claim 3, wherein the filter element is configured to have at least 40 or less. 5. A plate-shaped body made of a breathable porous material,
A large number of through holes are formed side by side from one end face of the opposite end to the other end face, and at one side of the plate-shaped body, in parallel with the through-hole, and the plate thickness of the plate-shaped body. A plurality of filter elements formed by protruding rib-shaped or padding-shaped space holding portions in the direction are stacked side by side so that the positions of the space holding portions are in the same direction, and these are arranged side by side. A filter unit, characterized in that, of the intervals of the respective filter elements, the intervals between both end portions orthogonal to the above-mentioned interval holding portion are each sealed. 6. A plate-shaped body made of a breathable porous material,
A large number of through holes are formed side by side from one end face of the opposite end to the other end face, and at one side of the plate-shaped body, in parallel with the through-hole, and the plate thickness of the plate-shaped body. A plurality of filter elements each having a rib-shaped or padding-shaped space holding portion projecting in the same direction are integrally formed in a stacked state so that the positions of the space holding portions are in the same direction. Among the intervals of the molded filter elements, the intervals between the both ends orthogonal to the interval holding portion are respectively sealed and assembled, or the sealing is simultaneously formed at the time of integral molding. And a filter unit. 7. An interval between the filter elements arranged in parallel is used as a flow passage for filtered air and dust-removing air, and at least one port or both ports of each through hole provided in each filter element is provided with dust-containing air. In addition to the inlet and outlet of the dust-removing air, the distance between the tip end side of each filter element formed into a chamfered shape that gradually thins the plate thickness is the outlet for the filtered air and the dust-removing air. 7. The filter unit according to claim 5, wherein the filter unit is a blow port. 8. A spacing element formed on one side of the filter element is formed by either ribs, padding, or sealing, and each of the stacked filter elements is sealed by the spacing element. 8. The filter unit according to claim 5, 6 or 7, wherein the cross-sectional area of the slit spacing on one side is at least 60% or more.