CN100406103C - air filter - Google Patents

Abstract

The present invention relates to an air filter. More than two nets are arranged on at least the downstream side of a filter assembly and are contained in a filter frame; at least one end of each net is bent to form more than two ribs; a reinforcing plate is arranged along the ribs; and the ribs are mutually butted with each other at the back sides and are fixed on the filter frame. Consequently, the strength of the nets is greatly improved; because of the arrangement of the nets, the air filter can effectively prevent the heavy filter assembly from deforming towards the downstream side direction due to the macro-scale operation of an air filter and the area enlargement of a filter medium, and can prevent filtering material form damage.

Description

air filter

technical field

The present invention relates to an air filter for creating an ultra-clean space such as a clean room for liquid crystal and semiconductor production.

Background technique

In the past, the structure of the clean room for liquid crystal and semiconductor production was that the air filter was installed on the entire ceiling, and the air was circulated by a large fan. Conventionally, as such an air filter, an air filter having a size of 610 mm in length and 610 mm in width has been used. As the filter material protection measure of the air filter, as shown in the Japanese Publication No. 57-73363, kraft paper is pasted on both sides of the filter paper with wavy pleats in the length direction, and a metal mesh made of metal mesh is set on the bottom surface. As for the reinforcement member, in order to further strengthen the reinforcement member, bends are provided on both sides of the metal mesh and embedded in the member, or in addition to the above bends, curling is provided on the flat portion of the metal mesh.

Recently, large air filters such as 4 feet in length and 4 feet in width have been adopted in order to reduce the amount of aluminum used on the ceiling and the number of fans related to the number of filters in order to create a low-cost clean room. When the large air filter is used in a horizontal position, the filter pack will be greatly deformed due to its own weight and wind pressure, and this deformation will cause damage to the filter material. Therefore, the solution to this problem has become a problem. .

But, in the filter material protection measure that above-mentioned bulletin discloses, only the liner plate that is formed with synthetic resin is provided with bending portion or is provided with the metal mesh of bending portion and crimp to be bonded on aforementioned kraft paper, and its reinforcing effect is little, The deformation caused by the self-weight and wind pressure is large, and the deformation of the filter material of the large air filter cannot be prevented.

In order to solve this problem, Japanese Patent No. 3337676 discloses an air filter. In the air filter, the filter assembly is composed of a filter material folded into folded pleats, at least downstream of the filter assembly, a mesh is provided, and one or more One or more ribs embed the periphery of the mesh in the cut grooves provided on the inner wall of the filter frame. The air filter improves the overall strength of the net, prevents deformation of the filter assembly and protects the filter material due to the surrounding of the net is embedded in the groove fixed on the inner wall of the filter frame.

However, in a large air filter, since the filter assembly itself has a very large dead weight, and the wind pressure acting on the filter assembly is also very large, after a long period of use, especially the central part of the filter assembly will be damaged Since the self-weight sags greatly toward the downstream side, in order to prevent the deformation of the filter pack for a long time, it is necessary to improve the protection measures of the filter material.

Contents of the invention

For this reason, the purpose of the present invention is to provide a kind of air filter, even this air filter also can keep uniform blowing out wind speed and collection efficiency as in the past even for the large-scale filter of vertical 4 feet * horizontal 4 feet, does not raise The pressure loss can more effectively prevent the deformation of the filter assembly and the damage of the filter material caused by it, and can be used for a long time.

In order to achieve the above object, the air filter described in the technical solution 1 of the present invention is equipped with two or more meshes and accommodated in the filter frame at least on the downstream side of the filter assembly, which is characterized in that At least one end of the above-mentioned mesh is bent to form two or more ribs, a reinforcing plate is arranged along the ribs, the backs of the above-mentioned ribs are butted against each other and fixed on the filter frame, and the ends of the above-mentioned ribs are Fold back, arrange the reinforcement plate between the folded portion and the rib, and crimp and fix the reinforcement plate to the rib by the folded portion.

In addition, the air filter described in claim 2 is the air filter described in claim 1, wherein the above-mentioned filter assembly is composed of a filter material with folded pleats, and the above-mentioned ribs are parallel to each other. on the pleats of the filter material.

In addition, the air filter according to claim 3 is the air filter according to claim 2, wherein the ribs are submerged in creases of the pleats of the filter material.

In addition, the air filter according to claim 4 is the air filter according to claim 1 , wherein the end of the rib is folded back at an acute angle to form a folded portion.

In addition, the air filter according to claim 5 is the air filter according to claim 1, wherein when the thickness of the air filter is X and the height of the rib is X1, X1/X is 1. /5～2/3.

In addition, the air filter according to claim 6 is the air filter according to claim 1, wherein the reinforcing plate has a thickness of 0.5 mm to 2 mm.

In addition, the air filter according to claim 7 is the air filter according to claim 1, wherein the reinforcing plate is a corrosion-resistant metal plate.

In addition, the air filter described in claim 8 is the air filter described in claim 1, characterized in that at least a pair of ends of the above-mentioned mesh are embedded in a slot fixed on the filter frame. .

Description of drawings

Fig. 1 is a plan view showing an air filter according to an embodiment of the present invention.

Fig. 2 is an explanatory diagram showing a state in which a reinforcing plate is fixed to a rib in an embodiment of the present invention.

Fig. 3 is a partially enlarged sectional view taken along line III-III of the air filter shown in Fig. 1 .

Fig. 4 is a graph showing time-dependent deformation of filter media in Examples of the present invention and in a conventional example.

Fig. 5 is a sectional view of a conventional air filter.

Detailed ways

In the air filter of the present invention, at least on the downstream side of the filter assembly, two or more nets are arranged and accommodated in the filter frame, and it is characterized in that at least one end of the nets is bent Fold to form 2 or more ribs, arrange reinforcing plates along the ribs, butt the backs of the ribs and fix them on the filter frame.

In the air filter of the present invention, the mesh is bent to form ribs, a reinforcing plate is arranged along the ribs, and the backs of two or more ribs are butted against each other and fixed to the filter frame, thus, Can greatly improve the strength of the mesh. Therefore, when the air filter of the present invention is a large air filter with a length of 916 mm or more and a thickness of 30 to 290 mm, the mesh with increased strength due to ribs and reinforcing plates can prevent heavy filter assemblies for a long time. Deformation toward the downstream side prolongs the life of the air filter.

The above-mentioned filter assembly is formed as follows: the filter material made of glass fiber, synthetic resin fiber, PTFE, etc. is folded into a folded shape. space, or, before folding the above-mentioned filter material, a strip-shaped hot-melt resin is applied in the extending direction of the filter material in advance to form a space maintaining part to maintain the space between the pleats.

In the above-mentioned filter pack, the straight ends parallel to the pleats of the filter material folded in a zigzag shape are fixed to the filter frame with an adhesive. The bent ends perpendicular to the pleats of the filter material are fixed to the filter frame with an airtight sealing material.

As the filter frame, a metal plate such as aluminum or stainless steel, a resin plate such as an extruded resin plate such as PC, or a wooden plate such as a plywood can be used.

As the mesh, a resin or metal wire mesh with a thickness of 0.5 mm or more and an opening ratio of 30 to 80% can be used.

For the mesh, at least a pair of ends of the mesh are embedded in the slots fixed on the inner wall of the filter frame, so that the overall strength of the mesh can be improved.

At least one end of the net is bent to form at least one rib on one net. Then the backs of the ribs of the mesh are butted against each other, which can improve the reinforcing effect of the ribs. For example, when disposing two nets on the downstream side of the air filter, in order to effectively prevent the filter assembly from deforming toward the downstream side, one end of each of the two nets is bent to form two ribs. The back surfaces of the two ribs are butted against each other to form a reinforcing part, and the reinforcing part is arranged at least in the central part of the filter pack. As another example, when disposing three pieces of mesh on the downstream side of the air filter, bend both ends of the mesh arranged in the central part to form two ribs on one mesh, and arrange the two ribs on both sides of the mesh. One end of the mesh in the central part is bent to form a rib respectively, and the ribs arranged on both ends of the mesh in the central part and the ribs arranged in one end of the mesh on both sides are arranged. , the back faces are butted against each other to form a butt joint, and the butt joint is preferably formed on both sides of the filter assembly. In addition, a plurality of meshes may be used, and the above-mentioned butting portions may be arranged at equal intervals of 50 to 100 mm.

Embedding at least one pair of end portions of the above-mentioned mesh in the slot fixed on the inner wall of the filter frame can improve the overall strength of the mesh.

In addition, when the ribs are arranged in parallel with the pleats of the filter medium of the filter pack, air flows from the upstream side to the downstream side along the ribs, so that the turbulence of the air can be suppressed.

In addition, when the above-mentioned ribs are submerged in the creases of the pleats of the filter material, the height of the ribs can be ensured by using the submerged space, and the width of the reinforcement plate arranged along the rib (the height when the reinforcement plate is erected along the rib) can also be ensured. , can further increase the strength of the mesh.

Also, when X1 is the height of the rib and X is the thickness of the air filter, X1/X is preferably 1/5 to 2/3.

If the above-mentioned X1/X is less than 1/5, the reinforcement effect of the ribs is small, and the strength of the mesh cannot be improved, so the deformation of the filter pack cannot be prevented after long-term use of more than one year.

In the clean room where the air filter is installed, organic gas is sometimes used for sterilization, etc., and the gas is often corrosive. Therefore, the above-mentioned reinforcement plate is preferably corrosion-resistant, such as stainless steel or aluminum processed by the aluminum surface passivation treatment method. Metal plate.

The thickness of the reinforcing plate is preferably 0.5 mm to 2 mm. If the thickness of the reinforcing plate is less than 0.5 mm, the reinforcing effect will be small. If it exceeds 2mm, the pressure loss increases.

In addition, the above-mentioned reinforcement plate is folded back at the end of the above-mentioned rib, and the reinforcement plate is crimped and fixed on the plane of the rib by the folded portion, and since the rib and the folded portion are used to wrap the reinforcement plate into the rib for fixing, the rib , the folded part and the reinforcing plate, the thickness of the reinforcing part of the reinforcing mesh is increased, and the strength of the mesh can be further improved. Therefore, the filter pack is stably prevented for a long period of time by the mesh material from gradually sagging and deforming the filter pack toward the air downstream side due to its own weight over time.

In addition, since the reinforcing plate is crimped and fixed to the rib by means of the folded-back portion formed by folding back the end of the rib, it does not protrude from the rib like bolts, rivets, etc. when the reinforcing plate is attached to the rib. As a result, the airflow is blocked, and the airflow through the air filter is not disturbed and does not form a quiet zone. In addition, unlike when the reinforcing plate is welded to the net, the unevenness of the product due to the level of welding is not caused, and an air filter with a high yield rate and stable quality can be provided. In this way, when the folded portion is formed at the end of the rib, the cut surface of the mesh does not face the filter medium, and the filter medium is not damaged by the cut surface of the mesh.

When the end of the rib is folded back at an acute angle to form a folded portion, the air circulating in the air filter does not collide with the end surface of the reinforcement plate, but flows along the acute angled folded portion, so the size of the air filter can be reduced. increase in pressure loss.

Both ends of the above-mentioned ribs and reinforcing plates can be fixed to the filter frame together with the filter pack with a sealing material. In addition, when the above-mentioned ribs and reinforcing plates are embedded in the grooves fixed on the inner wall of the filter frame, since the ribs and reinforcing plates are firmly fixed on the filter frame, the strength of the mesh is increased and the reinforcing effect is improved. .

Example

Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 is a plan view showing an air filter according to an embodiment of the present invention. Fig. 2 is an explanatory view showing a state in which a reinforcing plate is fixed to a rib. Fig. 3 is a partially enlarged sectional view taken along line III-III in Fig. 1 . Fig. 5 is a sectional view of a conventional air filter.

Example 1:

In FIG. 1 , 1 denotes an air filter, which is a large air filter with vertical and horizontal dimensions of 1220 mm×1220 mm and a thickness of 75 mm. It consists of a filter assembly 10 with a folded width of 65 mm, an aluminum filter frame 20 with a thickness of 15 mm, and two pieces of aluminum steel wire mesh 30 with a thickness of 1 mm and an opening ratio of about 70%.

The filter material 11 made of glass fibers constituting the filter pack 10 is folded in a zigzag shape, and the creases are fixed with a strip-shaped hot-melt resin to maintain the folding interval.

The ends 11a, 11b parallel to the pleats of the filter material 11 are fixed to the inner side walls 21, 22 of the filter frame 20 with an adhesive 12 . The bent ends 11c, 11d perpendicular to the pleats of the filter material 11 are hermetically fixed to the inner side walls 23, 24 of the filter frame 20 with a sealant 13 .

Two steel meshes 30, 30 are bent vertically at one end to form a rib 31 with a height of 30 mm, and the rib 31 is parallel to the pleats of the filter material 11 and submerged between the creases of the pleats of the filter material 11.

As shown in Figure 2, the end of the rib 31 is folded back to form a folded portion 31a at an acute angle of about 30 degrees, and a stainless steel reinforcement plate 32 is placed along the rib 31. The thickness of the reinforcement plate is 1mm, and the width corresponds to the height of the rib. is 28mm. The folded portion 31a is pressurized toward the rib from above the folded portion 31a, and the reinforcement plate 32 is rolled up by the folded portion 31a, and the reinforcement plate 32 is crimped and fixed to the rib 31 .

Then, as shown in FIG. 3 , the backs of the ribs 31, 31 formed at one end of the two steel wire meshes 30, 30 are abutted against each other in the manner of passing through the central portion of the filter assembly 10 to form the ribs 31, 31. The butt joint 33 arranges the wire meshes 30, 30 on the downstream side of the filter pack. The ends of the wire meshes 30 , 30 parallel to the ribs 31 , 31 are embedded and fixed in the slots 25 on the downstream side of the inner side walls 21 , 22 of the filter frame 20 . The ends of the steel wire meshes 30, 30 perpendicular to the ribs 31, 31, together with the ribs 31 and the reinforcing plate 32, are sealed and fixed on the inner side walls 23, 24 of the filter frame 20 with the sealing material 13 and the filter assembly 10 . In this way, since the rib 31 and the reinforcing plate 32 are fixed to the inner side walls 23, 24 of the filter frame 20, the strength of the steel mesh 30, 30 can be increased by the rib 31 and the reinforcing plate 32.

Example 2:

Adopt the air filter of the same material and size as the air filter of Example 1, the height of the rib is 11 mm, the width of the reinforcing plate matches the height of the rib, which is about 8 mm, and all the other conditions are the same as in Example 1.

Past example:

Adopt the air filter of the same material and size as the air filter of Embodiment 1, as shown in FIG.

For the air filters of the above-mentioned Examples 1, 2 and the prior examples, each air filter was placed horizontally, and the deformation of the filter assembly after 1 month, 3 months, 6 months, and 1 year was measured, and the filter material was confirmed. damage condition. The deformation of the filter pack is based on the downstream end of the filter frame of the horizontally placed air filter, and the amount of sagging deformation of the filter pack from the reference to the downstream side of the air filter is measured by the length. FIG. 4 shows the deformation state of the filter material of the air filter of Example 1 and the conventional example, and Table 1 shows the results of the deformation state of the filter material of the air filter of the embodiment 1, 2 and the conventional example.

Table 1

As shown in Table 1 and Figure 4, in Example 1, the ratio X1/X of the height X1 of the rib to the thickness X of the air filter is 1/5 or more (X1/X is 0.2 or more). The reinforcement plate, along with the enlargement of the air filter, is effectively prevented for a long time from the deformation of the filter assembly that is aggravated by the expansion of the filter material area. That is, even after the air filter of Example 1 was placed horizontally for one year, the deformation of the filter pack was only about 5 mm, and the filter material was not damaged. This is because the thickness of the reinforcement part for reinforcing the mesh, which is composed of the ribs formed on the mesh, the turned-back parts of the ribs, and the reinforcement plate, is increased, and the ribs and the reinforcement plate are fixed on the filter frame. , Therefore, the strength of the mesh can be greatly improved.

As shown in Example 2, when reinforcing plates are arranged on the ribs of the mesh, the strength of the mesh can be improved by means of the reinforcing effect of the ribs and the reinforcing plates, and after being placed horizontally for 3 months, the filter assembly Deformation is suppressed at around 4mm. However, when the ratio X1/X of the height X1 of the rib to the thickness X of the air filter is less than 1/5, the deformation of the filter pack cannot be prevented for a long time of more than 1 year, and the filter pack cannot be prevented after 6 months. The deformation of the filter is relatively large, reaching 18mm, and the filter material is damaged.

On the other hand, as shown in Table 1 and Fig. 4, in the past examples, only ribs are formed on the mesh, and no reinforcing plate is provided, so the reinforcing effect of the ribs is small, and the strength of the mesh cannot be greatly improved. , After being placed horizontally for 1 month, the deformation of the filter assembly is relatively large, reaching 18mm, which cannot prevent the deformation of the filter assembly and the damage of the filter material.

In addition, in Examples 1, 2 and the prior example, before the filter material is damaged, the uniform blowing wind speed of the air filter can be realized. In the examples 1, 2 and the prior example, the collection efficiency does not change. and reinforcement plates, the increase in pressure loss was not confirmed.

In the air filter of the present invention, two or more nets are arranged on at least the downstream side of the filter assembly and accommodated in the filter frame, and it is characterized in that at least one end of the nets is bent Fold to form two or more ribs, arrange reinforcement plates along the ribs, butt the backs of the ribs and fix them to the filter frame.

In the air filter of the present invention, the ribs are reinforced by reinforcing plates, and at the same time, the backs of the ribs are butted with each other and fixed on the filter frame, which can improve the reinforcing effect and greatly increase the strength of the mesh. Therefore, according to the air filter of the present invention, in a large air filter with a length of 916 mm or more and a thickness of 30 to 290 mm, the strength of the mesh is improved with ribs and reinforcing plates, and the strength of the mesh can be improved. Long-term protection against deformation of the heavy filter pack in the direction of the downstream side.

Fold back the end of the above-mentioned rib to form a fold-back portion, and use the fold-back portion to crimp and fix the reinforcement plate on the plane of the mesh, and use the above-mentioned rib, fold-back portion, and reinforcement plate to make the reinforcement of the reinforced portion of the mesh The increased thickness further improves the strength of the mesh, which can effectively prevent the deformation of the filter assembly and the damage of the filter material.

In addition, when the end of the rib is folded back at an acute angle to form the folded portion, since the rib is in a shape inclined at an acute angle toward the downstream side on the upstream side of the air filter, the air is guided by the folded portion, and the The upstream side of the filter flows along the ribs and the reinforcement plate toward the downstream side, preventing an increase in the pressure loss of the air filter.

In addition, when the above-mentioned ratio X1/X of the height X1 of the rib to the thickness X of the air filter is 1/5 to 2/3, the pressure loss of the air filter does not increase, and the reinforcement effect of the rib and the reinforcing plate is used to increase the pressure loss of the air filter. The strength of the mesh prevents the deformation of the filter pack, which has become heavy due to the increase in size of the air filter, even if it is left for a long time of more than one year.

Claims (8)

1. air cleaner in the downstream at least of filter pack, sets the net more than two or two and is housed in the filter frame, it is characterized in that,

At least one end bending described net forms the rib more than two or two, along this rib stiffener is set, and the back side of described rib is docked mutually and is fixed on the filter frame,

Turned back in the end of described rib, between this reflex part and described rib, dispose stiffener, the stiffener crimping is fixed on the described rib with described reflex part.

2. air cleaner as claimed in claim 1 is characterized in that, described filter pack is to constitute by having the filter material that is folded into the bended rivel, and described rib is parallel to the rivel of this filter material.

3. air cleaner as claimed in claim 2 is characterized in that, described rib submerges in the crease of rivel of described filter material.

4. air cleaner as claimed in claim 1 is characterized in that, is turned back in the end of described rib with acutangulating, forms described reflex part.

5. air cleaner as claimed in claim 1 is characterized in that, the thickness of establishing described air cleaner is the height of X, described rib when being X1, and X1/X is 1/5～2/3, and wherein X and X1 are equal number unit.

6. air cleaner as claimed in claim 1 is characterized in that the thickness of described stiffener is 0.5mm～2mm.

7. air cleaner as claimed in claim 1 is characterized in that, described stiffener is the metal making sheet of corrosion resistance.

8. air cleaner as claimed in claim 1 is characterized in that, at least one pair of end of described net is imbedded in the grooving that is fixed on the filter frame.

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