JPH06269623A - Filter device and its manufacture - Google Patents

Abstract

PURPOSE:To ensure that a filter device is compact with a large filtration area and thereby a gas is prevented from becoming contaminated by an off-gas by making the inner peripheral surface of flow-through holes formed in a plate- like support and the outer peripheral surface of the end of a cylindrical filter element in thermally melting synthetic resin, and connecting both by thermal deposition. CONSTITUTION:The filter device comprises a rigid plate-like support 9 and filter elements 10. The support 9 has flow-through holes 13 formed, for example, in a zigzag fashion, and is of thermally fusible synthetic resin. A sheet outside the filter element 10 is also of thermally fusible synthetic resin. In addition, one end 10a of the filter element 10 is fitted into the flow-through hole 13, and is fixed airtightly by thermal deposition at a thermally deposited part 78. Consequently, the filtration area is enlarged for a compact constitution, so that a filtering action is performed at low pressure loss, and no adhesive needs to be used, thus preventing a gas from becoming contaminated by an off-gas generating from the adhesive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device, a filter element used in the filter device, and a method for manufacturing the filter device, and particularly in a super clean room or the like.
rticulate Air), ULPA (UltraLow Penetration Ai)
r) or an ultra-ULPA filter device, preferably a filter device and a filter element, and a method for manufacturing the filter device.

[0002]

2. Description of the Related Art With recent advances in science and technology and changes in lifestyles, clean spaces and clear air are increasingly needed. Clear air is naturally desirable in hospitals and homes, and various air purifiers are used. The same applies to the precision machinery industry and the food industry. Furthermore, in the production of integrated circuits and semiconductors, the production of chemicals, and the production of medical-related products such as artificial organs, a much smaller amount of dust is allowed than in a normal clean space, and a HEPA filter device is generally preferred. Is a ULPA filter device, more preferably ultra ULP
A filter grade filter device is needed.

In the above-described filter device for cleaning air, a filter element made of a filter material for passing air to be cleaned to remove dust is attached to the filter device.

FIG. 38 is a schematic perspective view showing an example of this filter element. The filter element 1 is composed of a filter material 3 which is a filter material bent to form a plurality of ridges 2, for example, a glass fiber filter cloth. Furthermore, spacers 4 are generally arranged between the ridges (only two are shown by way of example) in order to evenly distribute the filter material. The periphery of such a filter element 1 is airtightly joined in a rectangular frame (not shown) using an adhesive such as urethane to form a filter device. Air passing through the filter device flows from the rear of the right hand in FIG. 38 through the filter material toward the front of the left hand, as indicated by the arrow. Such a filter element is disclosed, for example, in "Development of high-performance filter" (Osaka Chemical Research Series VOL.5 NO.9).
40 ~ by Osaka Chemical Marketing Center)
It is described on page 41.

One of the criteria for judging the performance of a filter device is the concept of filtration area. More specifically, the filtration area per unit volume of the filter element is a measure of the performance of the filter device. In general, the embodiment in which the filter element that is as compact as possible has the largest possible filtration area is the preferred embodiment that has high performance with low pressure drop.

In the filter element 1 of FIG. 38, the total area of the filter material 3 is the filtration area. In order to increase the filtration area in order to improve the performance of the filter element having such a structure, the interval between the ridge-shaped portions, that is, the pitch (length p in FIG. 38) is made as small as possible, and the ridges are formed. It is common practice to make the folds folds.

However, there is a limit to the reduction of the pitch p depending on the kind of the filter material to be used because of the problem of flexibility of the material itself, and if the pitch is too small, adjacent filter materials (or When the separator is present, the filter material and the separator) come into contact with each other, the flow path of the air becomes unnecessarily small, the pressure loss increases, and the blowing power becomes large, which is not preferable in many cases.

Considering, for example, the case where a non-woven fabric of glass fiber which has been generally used for an air filter is used as a filter material, a non-woven fabric having a thickness of 0.5 mm is used to construct the filter element having the structure shown in FIG. If configured, the pitch is considered to be limited to about 5 mm.
Therefore, for example, the frontage (length a in FIG. 38 x length b)
Is 610 mm × 610 mm and the depth (length c in FIG. 38) is 150 mm, the filtration area is about 16 m ² .

When glass fiber is used as a filter material, fine dust is generated from the glass fiber (Japanese Patent Publication No. 3-34967). Therefore, it is not the best material to obtain clean air.

It is an object of the present invention to provide a filter device and a filter element which are compact, have a large filtration area to reduce pressure loss, and are free from dust generation.

Further, in the prior art shown in FIG. 38, there is a problem in that an adhesive agent such as urethane for fixing the filter element 1 to the frame and an off gas from the binder fixing the glass fiber are generated. . Examples of the above-mentioned adhesive include epoxy-based, silicon-based, and cyanoacrylate-based adhesives in addition to urethane.

[0012]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a filter device and a filter element which prevent the generation of an undesired gas without using an adhesive and a binder. .

A further object of the present invention is to provide a method of manufacturing a filter device with improved productivity.

[0014]

According to the present invention, there is provided a support having a large number of through holes, and a tubular shape in which one end is inserted into the through hole of the support and the other end is closed so as to project from the support. At least one of the inner peripheral surface of the flow hole of the support, or at least one of the outer peripheral surface of the filter element is made of a heat-meltable synthetic resin, the inner peripheral surface of the flow hole of the support And the outer peripheral surface of the filter element are connected by heat fusion.

According to the present invention, the inner peripheral surface of the flow hole of the support is formed so that the inner diameter decreases from the one end of the filter element to the other end thereof, and the one end of the filter element flows. It is characterized in that the diameter is increased along the inner peripheral surface of the hole and the connection is made by heat fusion.

Further, the present invention is characterized in that the one end portion of the filter element has an outward flange covering the outer peripheral portion of the through hole, and the flange and the support body are thermally fused and connected. .

Further, according to the present invention, the support is made of a material other than the heat-meltable synthetic resin, at least the outer peripheral surface of the filter element is made of the heat-meltable synthetic resin, and the inner peripheral surface of the flow hole is finished into an uneven shape. It is characterized by a curved surface.

Further, the present invention is characterized in that at least the inner peripheral surface of the support is made of a heat-melting synthetic resin, and the outer peripheral surface of the filter element has an uneven shape.

Further, according to the present invention, a support having a large number of through holes, a cylindrical filter element having one end inserted through the through hole of the support and the other end closed and projecting from the support extend. A sleeve that is fitted to the one end of the filter element, has a flow hole through which gas flows, and includes a sleeve that presses the outer peripheral surface of the filter element in an airtight manner on the inner peripheral surface of the flow hole of the support. It is a characteristic filter device.

The present invention is also characterized in that the sleeve is detachably fitted to the one end of the filter element.

Further, according to the present invention, at least one of at least one of the inner peripheral surface of the through hole of the support and the outer peripheral surface of the filter element is made of a heat-meltable synthetic resin, and the sleeve is also made of a heat-meltable synthetic resin. The inner peripheral surface of the flow hole of the support, the outer peripheral surface of the filter element, and the sleeve are connected by heat fusion.

Further, according to the present invention, a locking recess is formed in the flow hole of the support, and the sleeve is elastically locked in the locking recess via the one end of the filter element. It is characterized by having a stop convex portion.

Further, according to the present invention, there are provided a porous membrane, and a pair of sheets each having a pore size larger than a diameter of the porous membrane, laminated on both sides of the porous membrane and fixed by sandwiching, and made of a heat-meltable synthetic resin. Is formed into a tubular shape, and one end portion in the axial direction is crushed so as to be within a virtual circle projected in the axial direction of the remaining portion, and at least the inner side of the pair of sheets is crushed. The filter element is characterized in that the sheets are heat-sealed to each other and closed.

According to the present invention, one end in the axial direction is
A cylindrical filter element that is crushed and closed so as to enter the virtual circle projected in the axial direction of the remaining part, with one end of each filter element facing down, above the jig. The filter elements are individually stored in a plurality of open bottomed storage recesses, and the other end of the filter element projects above the jig and has a large number of flow holes. The other end portion of the filter element is inserted therein, and the other end portion of the filter element and the flow hole of the support body are heat-sealed to be connected to each other.

[0025]

According to the present invention, one end of a cylindrical filter element is connected to a large number of through holes formed in a support formed in a plate shape, and the other end of the filter element is connected. Is closed to form a filter device, so that the gas to be filtered that has entered through the flow holes passes through the filter element to be cleaned, or in the opposite direction, that is, the gas passes from the outside to the inside of the filter element. Then, it is cleaned and discharged from the flow hole. In this way, the filter element is formed into a tubular shape,
Since it is connected to a large number of flow holes in the support, the overall structure can be made smaller, the filtration area can be increased, the pressure loss can be reduced, and dust generation can be prevented. can do.

At least one of at least one of the inner peripheral surface of the through hole of the support and the at least one outer peripheral surface of the filter element is made of a heat-meltable synthetic resin, and the inner peripheral surface of the through hole of the support and the outer periphery of the filter element. Since the above-mentioned adhesive is not used in the present invention since it is connected to the surface by heat fusion, undesired off-gas is generated from such an adhesive and gas such as air is polluted. Can be prevented.

The inner peripheral surface of the flow hole of the support is formed in a hollow truncated cone shape so that the inner diameter becomes smaller from the one end of the filter element to the other end thereof, and the one end of the filter element is formed. May be configured so as to be expanded in diameter along the inner peripheral surface of the flow hole, or alternatively, the one end of the filter element is formed in an outward flange shape, and the flange and the support are heat-sealed. The support element made of a material other than the heat-meltable synthetic resin may be formed with a concavo-convex shape on the inner peripheral surface of the flow hole so that the heat-meltable synthetic material of at least the outer peripheral surface of the filter element is formed. The resin may be melted by heat and the filter element and the support may be fixed by the so-called anchor effect.
Furthermore, the outer peripheral surface of the filter element is made uneven such as a non-woven fabric, and at least the inner peripheral surface of the support, which is made of a heat-fusible synthetic resin, is heat-melted so that the anchor effect is exerted and the filter element and the support And may be fixed.

Further, according to the invention, the sleeve is used to press the outer peripheral surface of the filter element against the inner peripheral surface of the through hole of the support body in an airtight manner to fix the filter element and the support body at this time. Of the support element is made detachable so that the filter element can be easily replaced when the filter element is damaged or the sleeve is made of a heat-meltable synthetic resin. The inner peripheral surface of the through hole, the outer peripheral surface of the filter element, and the sleeve may be heat-sealed and fixed to each other. In order to make it removable by utilizing the elastic force of the sleeve, a locking recess is formed in the through hole of the support, and a locking projection is formed in the sleeve, and the locking recess is formed between the sleeve and the support. The one end of the filter element can be interposed and fixed.

Still further in accordance with the invention, the closed end of the filter element is such that it lies within a virtual circle projected axially of the remaining portion, ie the outer diameter of its collapsed end. Keep the outer diameter of the remaining part or less so that the filter element is inserted and stored in the storage recess of the jig, and the end protruding upward from the storage recess of this filter element is It can be inserted into the through hole and connected by heat fusion, and thus the manufacturing can be automated, and the productivity can be improved.

[0030]

1 is a perspective view of a filter device according to an embodiment of the present invention, FIG. 2 is a partial perspective view thereof, and FIG. 3 is a sectional view of the filter device. This filter device
For example, it is provided on the ceiling of a super clean room and is supplied with air to be cleaned, as indicated by arrow 6, and the cleaned air is passed through a filter device 8 according to the invention as indicated by arrow 7. Supplied indoors. The filter device 8 basically comprises a rigid plate-shaped support 9 and a number of filter elements 10. This flange 39
A mounting hole 40 is formed in the mounting hole 40, a screw 41 is inserted into the mounting hole 40, and the filter device 8 is fixed to the ceiling plate 43 via a gasket 42. A protective frame 11 which is a tubular body is fixed to the lower surface of the support body 9 in FIG. This protective frame 11
The filter element 10 is protected by surrounding the outside of the filter element 10 and preventing the filter element 10 from being damaged by an external force.

A ventilation member 12 is provided below the protective frame 11 to improve the appearance. The ventilation member 12 may be configured by a large number of blades arranged side by side, but may be configured by a net or the like. The ventilation member 12 may also be a sheet or film having a large number of ventilation holes formed therein. The cleaned air can be rectified and supplied to the room by the ventilation member 12 as described above by the arrow 7. The mounting flange 34 is formed outside the region of the support 9 in which the flow hole 13 is formed.

As another embodiment of the present invention, a metal punching metal, for example, is used as the ventilation member 12 provided in the lower portion of the frame body 11, so that when a fire occurs in the room, the flame is directed to the filter element 10 side. Passing is prevented and flame is blocked.

The support 9 of the filter device 8 is made of a heat-meltable synthetic resin such as polyethylene, polypropylene, AB.
S resin, polyethylene terephthalate (abbreviation PET),
Polyamide, polyvinyl chloride, polystyrene, polyether sulfone, methacrylic resin, etc. can be used.

A large number of through holes 13 are formed in the support 9 in a staggered manner as shown in FIG. Each circulation hole 13
Has an inner diameter D1 of typically 4 to 5 mm,
The minimum distance D2 between adjacent flow holes 13 is, for example, 1 mm.
Alternatively, the axis of each flow hole 13 is at the apex position of the rhombus as indicated by the imaginary line 14. In this embodiment, the flow holes 13 are arranged in a zigzag pattern, but as another embodiment of the present invention, the axis of each flow hole 13 may be arranged at the apex position of a square or a rectangle. By arranging them in a zigzag manner as in the embodiment described above, it is possible to form as many flow holes as possible per unit area of the support 9 and thereby increase the filtration area as much as possible.

According to the invention, the filter element 10
The inner diameter of is, for example, 2 to 20 mmφ, preferably 2 to 10 mmφ. If the inner diameter of the filter element 10 is less than 2 mmφ, as will be described later with reference to FIG. 8, when the mandrel 23 is manufactured, the mandrel 23 becomes too thin and the mandrel 23 bends, resulting in an accurate Although it is difficult to manufacture the filter element 10, when the filter medium 16 has a flexible structure, it is possible to prevent the mandrel 23 from bending during such manufacturing and to further reduce the diameter. If the inner diameter of the filter element 10 exceeds 20 mmφ, it is difficult to achieve the object of the present invention to obtain a filtration area which is as small as possible and has a largest possible area.

One end 10a of the filter element 10
Is fitted in the through hole 13 and is airtightly fixed by heat fusion. The other end 10b of the filter element 10 is
As shown in FIGS. 12 to 21, which will be described later, it is crushed and closed by heat fusion. The length of the filter element 10 in the upper and lower axial directions in FIG. 3 can be selected as desired, but in practice, the length is, for example, about 50 mm or more and less than about 300 mm. The filter element 10 may be longer, but doing so would add to the overall structure of the filter device, and therefore would be meaningless if it is too long. The filter element 10 may be formed as short as less than 50 mm.

The filter element 10 is formed into a cylindrical shape by spirally winding it as shown in FIG. 8 described later using the filter medium 16 shown in FIG. The filter medium 16 is composed of a porous film 17 and sheets 18a and 18b fixed to overlap with the porous film 17. The sheets 18a, 18b may be indicated generally by the reference numeral 18. The porous membrane 17 has an average pore diameter of 0.1 to 5 μm and a pressure loss of 10 to 200 mmH ₂ O when air is permeated at a flow rate of 5.3 cm / sec. As shown in Table 1 below, 10
~100mmH a ² O consisting of PTFE (polytetrafluoroethylene).

Such a porous membrane made of PTFE has P
The TFE semi-baked body is stretched biaxially at a stretching area ratio of at least 50 and heat-treated at a temperature equal to or higher than the melting point of PTFE, so that the porous film is predominantly composed of fibrils, that is, an image of a scanning electron micrograph. The area ratio of fibrils and nodules by the treatment was 99: 1 to 75:25, the average fibril diameter was 0.05 μm to 0.2 μm, the maximum area of the nodules was 2 μm ² or less, and the average pore diameter was 0. It is a PTFE porous membrane having a thickness of 2 to 0.5 μm. According to the porous film made of PTFE, for example, 0.1
It is possible to remove 99.9995% of dust having a diameter of μmφ or more.

As described above, the structure of the stretched porous body obtained by stretching the PTFE semi-sintered body in the biaxial direction by an expansion area ratio of at least 50 times, preferably at least 70 times, and more preferably at least 100 times has almost nodule. It has a peculiar membrane structure composed of fine fibers. Moreover, the average pore diameter of the PTFE porous membrane thus produced is extremely small, usually 0.5 μm to 0.2 μm, and the thickness of the membrane is 1/20 of that before stretching (the original thickness of the semi-baked body). Is, for example, 100 μm, it is 5 μm after stretching and firing) to about 1/50.

Porous membrane 1 made of PTFE in the present invention
Table 1 collectively shows the preferable range and particularly preferable range of each parameter of No. 7.

[0041]

[Table 1]

Although the practicable film thickness of the porous film 17 is in the range shown in Table 1, the practicable range according to the present invention is 0.05 to 100 μm, preferably 0.
It is in the range of 05 to 10 μm. The average pore diameter is as shown in Table 1, but the practicable range according to the present invention is 0.1 to 5 μm.

Conventionally, there is a flat filter medium made of glass fiber. When an attempt is made to manufacture a filter element by forming such a filter medium made of glass fiber into a tubular shape by the method shown in FIG. The filter medium cannot be smoothly curved, and a sharp corner or an obtuse angle is formed to form a bent corner. As a result, dust is generated and dust contained in the air to be filtered passes through a relatively large gap in the corner portion without being filtered, which makes it difficult to clean the air.
The filter medium 16 according to the present invention described above solves such a problem.

A method of measuring each of the above characteristics will be described.

Average Pore Size Mean flow pore size (MFP) measured according to the description of ASTM F-316-86 was taken as the average pore size.
Actual measurements are based on the Coulter Pometer
rometer) [Coulter E
lectronics) (UK)].

[0046] Using the film thickness Mitutoyo Corporation Ltd. 1D-110MH type film thickness meter, the thickness of the entire measured repeatedly five porous membrane dividing the thickness at 5, one obtained value The film thickness of the film.

The cut out pressure loss porous membrane into a circle having a diameter of 47 mm, was set in a filter holder of the transmission effective area 12.6 cm ^2, in which pressurized inlet side to 0.4 kg / cm ^2, the air exiting from the outlet side The flow rate was set to a flow rate of 5.
It was adjusted to 3 cm / sec, and the pressure loss at that time was measured with a manometer.

Calcination degree The calcination degree of the PTFE semi-calcined product of the present invention is determined as follows.

First, from the PTFE unsintered body, 3.0 ± 0.
A 1 mg sample is weighed and cut out, and a crystal melting curve is first obtained using this sample. Similarly, a sample of 3.0 ± 0.1 mg is weighed and cut out from the PTFE semi-baked body, and a crystal melting curve is obtained using this sample.

The crystal melting curve is referred to as a differential scanning calorimeter (hereinafter referred to as "DSC". For example, DSC-5 manufactured by Shimadzu Corporation).
0 type) to record. First, a sample of the PTFE unfired body is placed in a DSC aluminum pan, and the heat of fusion of the unfired body and the heat of fusion of the fired body are measured by the following procedure.

(1) Samples were heated at a heating rate of 50 ° C./min to 25
Heat to 0 ° C, then 250 ° C at 10 ° C / min heating rate
To 380 ° C. The peak position of the endothermic curve that appears in this process is defined as "melting point of PTFE unfired body".
Alternatively, it is defined as "melting point of PTFE fine powder".

(2) Immediately after heating to 380 ° C., the sample is cooled to 250 ° C. at a cooling rate of 10 ° C./min.

(3) The sample is heated again to 380 ° C. at a heating rate of 10 ° C./min. The peak position of the endothermic curve that appears in the heating step (3) is defined as the "melting point of the PTFE fired body".

Subsequently, the crystal melting curve of the PTFE semi-baked body is recorded according to the step (1).

The heat of fusion of the PTFE unfired body, the fired body, and the semi-fired body is proportional to the area between the endothermic curve and the baseline, and the Shimadzu DSC-50 model automatically sets the analysis temperature. Calculated.

Therefore, the firing degree is calculated by the following formula.

Firing degree = (ΔH ₁ −ΔH ₃ ) / (ΔH ₁ −ΔH ₂ ) ... (1) where ΔH ₁ is the heat of fusion of the PTFE unfired body, ΔH ₂ is the heat of fusion of the PTFE fired body, and ΔH ₃ is the heat of fusion of the semi-sintered PTFE.

Image analysis The area ratio of fibrils to nodules, average fibril diameter, and maximum nodule area were measured by the following methods.

A photograph of the surface of the porous film is taken with a scanning electron microscope (Hitachi S-4000 type deposition is Hitachi E1030 type) (S
EM photograph, magnification 1000-5000 times). This picture is processed by an image processor (Ratock Engineering Co., Ltd. Image Command 4198, TVIP).
-4100) and separated into nodules and fibrils,
An image consisting of nodules and an image consisting of fibers are obtained. The maximum nodule area was obtained by arithmetically processing an image consisting of only nodules, and the average diameter of fibrils was obtained by arithmetically processing an image consisting of only fibrils (total area divided by 1/2 total perimeter).

The area ratio of fibrils and nodules was calculated from the ratio of the total area of fibril images to the total area of nodule images.

The sheets 18a and 18b have a pore size larger than the average pore size of the porous membrane 17, sandwiched on both sides of the porous membrane 17 and sandwiched and fixed by heat fusion or by using a dotted adhesive. To be done. This sheet 18a, 1
8b is made of a heat-fusible synthetic resin, and is preferably made of synthetic fibers 19 having a core / sheath structure.
The synthetic fiber 19 comprises an outer layer 20 and an inner layer 21 as shown in FIG. The outer layer 20 is made of a synthetic resin having a low melting point (for example, about 120 ° C.) for heat fusion, and the inner layer 21.
Is made of a high melting point synthetic resin in order to prevent heat shrinkage at the time of heat fusion and to maintain voids at the time of heating, and for example, combinations 1 to 4 shown in Table 2 are exemplified.

[0062]

[Table 2]

Synthetic fiber 1 having such a core / sheath structure
9 is composed of a non-woven fabric or a woven fabric. The outer layer 20 has a lower melting point than that of the inner layer 21, which has the advantage that the porous film 17 can be heat-sealed and fixed without an adhesive. The inner layer 21 has a higher melting point than the outer layer 20, and when the outer layer 20 is thermally melted, the inner layer 21 does not melt, so that it does not shrink, and therefore the fine voids of the reinforcing sheet 18 are not closed.

By using the materials shown in Table 2 above, the sheets 18a and 18b can be made of a heat-meltable synthetic resin. The outer layer 20 may also be polyethylene terephthalate (PET) or the like.

According to the filter medium 16 shown in FIGS. 5 and 7, the porous film 17 has a pair of sheets 18a and 18a.
Since it is sandwiched by b, it is possible to prevent the porous film 17 from being scratched such as pinholes. Further, as shown in FIG. 9 described later, the inner sheet 1 extends over the length e1.
Since 8a and the outer sheet 18b are heat-sealed, the excellent effect of improving the adhesive strength is also achieved. This also applies to a configuration in which the filter media 16 are partially overlapped and heat-sealed into a tubular shape as shown in FIG. 10 described later. In this way, in particular, the outer sheet 18b serves to prevent the porous film 17 from being damaged by an external force and protect it, and to improve the adhesive strength when heat-sealed to the inner sheet 18a as shown in FIG.

7 and 8 show the filter element 1
It is a perspective view for explaining the process of manufacturing 0. Figure 7
The lengths e and f (e = f in this embodiment) of the widthwise ends of the reinforcing sheet 18 of the filter medium 16 shown in FIG. 8 are spirally wound by the heat-sealing form shown in FIG. 8 to form a cylindrical filter. The element 10 is configured. As shown in FIG. 8, a right cylindrical mandrel 23 is rotatably provided, and the roll 24 of the filter medium 16 is spirally wound around the mandrel 23 while applying a braking force in the direction of the arrow 25. Two
The outer peripheral surface of the filter medium 16 wound around the No. 3 is an endless belt 26.
The air is blown by the nozzle 26 to the region indicated by the length e in FIG. 7 at one end in the width direction of the filter medium 16 which is driven to rotate by a and is supplied from the roll 24, and the heat shield plate 32 is provided. Restricts the range over which hot air is blown, and thus the outer layer 20 of the synthetic fibers 19 forming the sheets 18a and 18b is melted and softened to form the filter element 10. The sheet 18a on the inner side and the sheet 18b on the outer side of the filter medium 16 extend over the length e in the axial direction,
It is heated and pressure-bonded to prevent voids in the portion extending over the length e, and airtightness is achieved.

The spiral wound filter element 1 depends on the difference between the friction coefficients acting on the filter medium 16 of the belt 26a and the mandrel 23, more specifically, the kinetic friction coefficient.
0 is formed. That is, since the frictional drag force generated between the belt 26a and the filter medium 16 is larger than the frictional drag force generated between the mandrel 23 and the wound filter medium 16, the spirally wound filter element 10 is formed and the mandrel is formed. Unrolled from 23. The inner sheet 18a achieves the function of heat sealing for an airtight closure at the end 10 and is spirally wound with a mandrel 23 as described in connection with FIG. When the element 10 is formed, it prevents the porous membrane 17 from directly contacting and damaging the mandrel 23, and protects the porous membrane 17.

In the filter element 10, the thickness of the porous membrane 17 may be, for example, 10 to 100 μm, and particularly when the thickness of the porous membrane 17 exceeds 100 μm, the outer sheet 18b can be omitted. Inner seat 18a and outer seat 18
The thickness of b may be 0.10 mm to 0.50 mm, for example, the thickness of the inner sheet 18a is 0.26.
The thickness of the outer sheet 18b is, for example, 0.16 mm.

The outer diameter of the mandrel 23 is selected to be 2 to 20 mmφ corresponding to the inner diameter of the filter element 10.
If the inner diameter of the filter element 10 is small, the mandrel 23 bends, thus making it difficult to process, and if it is large, the filtering area is reduced.

In the embodiment shown in FIG. 2, the support 9
L1 × length L2 is 610 mm × 610 mm, and the length H protruding from the support 9 of the filter element 10 is 150 mm, and D1 = in FIG.
When it is set to 4.0 mm and D2 = 1 mm, the filtration area is about 23 m ² . From this, it is confirmed that the filtration area can be obviously increased as compared with the prior art having the filtration area of about 16 m ² described with reference to FIG.

FIG. 10 is a perspective view of a part of another embodiment of the present invention. Instead of spirally winding the filter medium 16, the lengthwise direction of the filter medium 16 is made perpendicular to the axis of the cylinder to be formed into a straight cylindrical shape, and by fixing by heat fusion,
The filter element 10 may be configured in a cylindrical shape.

FIG. 11 shows a structure in which the end portion 10a of the filter element 10 is fixed to the support 9 by heat fusion. The support 9 is made of a heat-meltable synthetic resin, and the outer sheet 18b of the filter element 10 is made of a heat-meltable synthetic resin as described above.
18b is hermetically connected at the heat-sealed portion indicated by reference numeral 78.

FIG. 12 is a view for showing a connection work by heat fusion between the support 9 and the filter element 10 shown in FIG. The inner peripheral surface of the flow hole 13 of the support 9 extends from one end 10 a of the filter element 10 to the other end 10 thereof.
The inner diameter becomes smaller as it becomes b, that is, as it goes from the upper side to the lower side in FIGS. 11 and 12, and in FIG.
And the inner diameter of the lower part is shown as d2. By inserting the upper end portion 10a of the filter element 10 into the flow hole 13 and inserting the truncated cone-shaped end portion 72 of the ultrasonic vibration horn 71 into the end portion 10a of the filter element 10, The end portion 10a has a through hole 13
The diameter is expanded along the inner peripheral surface of the and is instantly fixed to the support 9 by heat fusion. The frequency of the ultrasonic vibration horn 71 is 40 kHz, and the pressure bonding time at the time of heat fusion is 0.2 to 0.
3 seconds.

In the experiment conducted by the present inventor, the porous membrane 17 is a non-woven fabric made of the fibers of the combination 1 in Table 2 above and has a basis weight of 50 g / cm ² , and the total thickness after laminating the sheets 18a and 18b is It was about 0.5 mm. The outer diameter d2 of this filter element 10 is 6 mm and the inner diameter is about 5 m.
m, total length L0 = 150 mm, closed length L3 by heat fusion of the end portion 10b = about 5 mm, the support 9 is made of polyethylene (melting point about 120 ° C.), and its thickness L4 = 7 m.
m, the inner diameter d1 of the upper part of the flow hole 13 is 7 mm, the inner diameter d2 of the lower part is 6 mm, and the end portion 1 of the filter element 10 is
0a is the end portion 72 of the ultrasonic vibration horn 71 as described above.
Is expanded by. End 72 of ultrasonic vibration horn 71
Has a tip outer diameter d3 = 4 mmφ and a base end outer diameter d.
4 = 8 mm and length L5 = 15 mm.

The end portion 10b of the filter element 10 is
The inner sheets 18a are crushed and heat-sealed to each other so as to be airtightly closed, and thus the end 10b is formed into a flat plate shape. At this time, the width of the flat end 10b (in the plane of FIG. 12). The length in the vertical direction) is larger than the outer diameter of the filter element 10.

As another embodiment of the present invention, the end portion 10c of the filter element 10 shown in FIG. 13 has a bottom surface as shown in FIG. 14 and a right side surface as shown in FIG. The section perpendicular to the axis may be bent in a substantially V shape so that the inner sheets 18a are heat-sealed to each other to be closed. Angle θ of the end 10c
By setting 1 to, for example, 76 degrees, the end portion 10c
The outer diameter of the filter element 10 can be within the outer diameter of the remaining portion of the filter element 10. In other words, the remaining portion of the filter element 10 other than the end portion 10c has an end within the virtual circle 114 projected in the axial direction. It can be configured to include the portion 10c. Due to the blockage of the end portion 10c due to heat fusion, as shown in FIG.
Using a base 74 having a V-shaped convex portion 75 and a pressing member 76 having a V-shaped convex portion 75, the base 74 and the pressing member 76 are heated to a temperature sufficient for the heat fusion. 16 (2), the end portions of the filter element 10 are interposed between the base 74 and the pressing member 76, and both 74 and 76 are moved close to each other as shown by an arrow 77. Thus, the end portion 10c is crushed to achieve heat fusion.

As still another embodiment of the present invention, FIG.
The end 10d of the filter element 10 as shown in FIG.
Of the outer sheet 1
8b is also configured to be heat-sealed. That is, FIG.
~ By further crushing the end portion 10c in the embodiment of FIG. 16 to make the angle θ1 zero, the end portion 10d of FIG.
Is formed. In this way, the end portion 10d can be made smaller.

Yet another embodiment of the present invention is shown in FIG. 18, with its bottom surface shown in FIG. 19 and its side surface shown in FIG. In this embodiment, the end portion 10e of the filter element 10 is formed in a plus shape in the cross section perpendicular to the axis, and the inner sheets 10a are heat-sealed to each other and closed.

FIG. 21 shows another embodiment of the present invention.
As shown in the bottom surface of the filter element 10, the cross section of the end portion 10f of the filter element 10 perpendicular to the axis may be crushed in a Y shape and heat-sealed to be closed.

FIG. 22 is a cross-sectional view showing the construction of another embodiment of the present invention in which the end portion 10a of the filter element 10 and the flow hole 13 of the support 9 are heat-sealed. Although this embodiment is similar to the embodiment shown in FIG. 11 described above, in this embodiment, the inner diameter of the inner peripheral surface of the through hole 13 is uniform in the axial direction. Reference numeral 78 indicates a heat-sealed portion.

FIG. 23 is a sectional view showing a connection structure by heat fusion between the filter element 10 and the support 9 according to still another embodiment of the present invention. This embodiment is similar to the embodiment of FIG. 22 described above, but it should be noted that in this embodiment, as indicated by reference numeral 79, the filter element 1
A part of the end portion 10 a of 0 is spot-welded on the upper surface of the flow hole 13 of the support 9 over the entire circumference.

FIG. 24 is a cross-sectional view showing a connection structure by heat-sealing the end portion 10a of the filter element 10 and the support 9 according to still another embodiment of the present invention. Although this embodiment is similar to the previous embodiment, it should be noted that the end portion 10a of the filter element 10 has an outer peripheral portion 8 of the through hole 13.
0 has an outwardly facing flange 81, and this flange 81 and the upper surface 82 of the support 9 in FIG.
The portions indicated by reference numeral 83 are thermally fused and connected to each other.

In each of the above-mentioned embodiments, the support 9 is made of heat-meltable synthetic resin, and the filter element 10 is made of heat-meltable synthetic resin at least on the outer peripheral surface.
As a further embodiment of the present invention, as shown in FIG. 25, the support 9 is basically a main body 89 made of a material other than a heat-meltable synthetic resin, and a through hole 1 in a mounting hole 85 of the main body 89.
3, a mounting member 84 made of a heat-melting synthetic resin having a right cylindrical shape is formed, and the mounting member 84 is airtightly fixed to the mounting hole 85. The end portion 10a of the filter element 10 is inserted into the mounting member 84, and the portion indicated by reference numeral 86 is heat-sealed and connected by using, for example, ultrasonic waves as described above.

The material other than the heat-meltable synthetic resin may be a metal such as aluminum, titanium or stainless steel, or may be a cross-linking type synthetic resin such as epoxy resin or Bakelite, or Further, a composite reinforced synthetic resin (abbreviation FRP) in which fibers such as glass fiber or carbon fiber are mixed in epoxy resin may be used.

FIG. 26 is a partial cross-sectional view of still another embodiment of the present invention. Filter element 1 of this embodiment
Although at least the outer peripheral surface of 0 is made of a heat-melting synthetic resin as described above, the support 9 having the flow holes 13 is
It is made of a material other than the above-mentioned heat-meltable synthetic resin. The inner peripheral surface of the flow hole 13 is a surface finished in an uneven shape, and the end portion 10a of the filter element 10 is heat-melted in the heat-melting portion 115, so that the inner peripheral surface of the flow hole 13 has an uneven shape. It enters, the anchor effect is exhibited, so to speak,
An airtight and firm bond between the filter element 10a and the support 9 is achieved.

FIG. 26 shows the experimental results of the inventor of the present invention.
In the above, the support 9 is made of epoxy resin, and the through hole 1
The inner peripheral surface of 3 is sandblasted using an Ascon sandblasting device (manufactured by Atsuko Tekko Co., Ltd.). The sand particles are Tosa Emery 120 mesh, and the air pressure is 4k.
The surface is roughened by jetting at g / cm ² . According to the sandblast method, it is possible to obtain an uneven shape having a satin finish.
The end portion 10a of the filter element 10 similar to that shown in FIG. 2 is inserted into the through hole 13, and a soldering iron heating rod heated to 150 ° C. is inserted into the end portion 10a for 15 seconds. Then, the end portion 10a and the support 9 are fixed to each other by heat melting. In order to check the adhesion strength, the surface wind velocity 10c is set in the end portion 10a of the single filter element 10.
It was confirmed that the filter element 10 did not come off at the end 10a when air was blown at m / sec (please check).

As another embodiment of the present invention, in the structure of FIG. 26, an ultrasonic vibration horn may be used instead of the heating rod. Instead of finishing with an uneven shape by sandblasting, a knurling jig may be used to form a mesh pattern, that is, a file pattern, or a lathe may be used to form a scribing pattern, or another method. The uneven shape may be formed by. Although the support 9 may be made of a material other than the heat-meltable synthetic resin as described above, as another embodiment, it is higher than the melting temperature of the heat-meltable synthetic resin material of the outer sheet 18b of the filter element 10. Even if the material has a melting point, finishing in such an uneven shape is effective for improving the fixing strength.

FIG. 27 is a sectional view showing a structure in which the end portion 10a of the filter element 10 and the support 9 of another embodiment of the present invention are fixed by heat fusion. The sheets 18a and 18b on the outer side of the filter element 10 are non-woven fabrics made of fibers made of a synthetic resin material such as polyethylene terephthalate, the sheets 18a and 18b have a melting point of about 235 ° C., and the support 9 has a melting point of 120. It is made of polyethylene having a temperature of about ° C, and other configurations are the same as those of the material shown in Fig. 11. A heating rod is inserted into the end portion 10a of the filter element 10 for heat-sealing, and the end portion 10a of the filter element 10 and the support body 9 are heat-sealed and fixed at a portion indicated by reference numeral 90. . In this case, the sheets 18a and 18b on the outer side of the filter element 10 do not melt because the melting temperature is as high as about 235 ° C. as described above, and the support 9 is melted and the ends 10a and the support 9 are not melted. Fixation is achieved. It was confirmed that the fixing strength was a large value as in the above-mentioned examples.

In the embodiment shown in FIG. 27, the heat-melted synthetic resin material of the support 9 is used as the filter element 1.
0 into the non-woven fabric of the outer sheet 18b to achieve a firm connection. In this way, the outer peripheral surface of the end portion 10a of the filter element 10 is formed into a fine uneven shape, and since it does not heat-melt, it can be said that it is made of a material other than the heat-meltable synthetic resin, while the support 9 Since at least the inner peripheral surface of the through hole 13 of the filter is made of a heat-meltable synthetic resin, the end portion 10 of the filter element 10 is
The connection by thermal fusion between a and the support 9 will be achieved as described above. When a material other than the heat-melting synthetic resin material is used as the material of the sheets 18a and 18b on the outer side of the filter element 10, for example, a nonwoven fabric made of heat-resistant synthetic resin fiber such as aramid fiber may be used.

FIG. 28 is a sectional view showing a structure in which an end portion 10a of a filter element 10 of still another embodiment of the present invention is airtightly fixed to a support 9. In the embodiment shown in FIG. 28, the end portion 10 of the filter element 10 is attached to the inner peripheral surface of the through hole 13 of the support 9 by the sleeve 91.
a is pressed and fixed. The sleeve 91 is detachably fitted to the end portion 10a, and therefore, when the filter element 10 is damaged, the filter element 10 can be easily replaced.

FIG. 29 is a sectional view showing a manufacturing process of the embodiment shown in FIG. The sleeve 91 is a molded product made of polyethylene, and has an annular flange portion 92 and a hollow truncated cone shape that is continuous with the flange portion 92 and expands away from the flange portion 92 (that is, toward the lower side of FIG. 29). The first tubular portion 93 and the second tubular portion 94 which is continuous with the first tubular portion 93 and has a hollow conical truncated cone shape whose diameter becomes smaller as the distance from the flange portion 92 increases. The sleeve 91 is formed with a flow hole 99 extending along the axial direction thereof. The dimensions of the sleeve 91 according to the experiments conducted by the inventor of the present invention are as follows: L6 = 20 mm, L7 = 7.5 mm, L
8 = 2 mm, d5 = 12 mm, d6 = 7 mm, d7 = 5
mm, d8 = 14 mm.

A sleeve 91 is provided in the through hole 13 of the support body 9.
Coronal-shaped inclined surfaces 95 and 96 that are inclined in the axial direction are formed corresponding to the first and second cylindrical portions 93 and 94, thereby forming the locking recess 97. The size and shape of the through hole 13 are L9 = 15 mm, L10 = 7.5 mm, d
9 = d10 and d11 = 14 mm. The outer diameter d12 of the filter element 10 to be connected = about 10 m
m, and d11>d9> d12. Sleeve 91
The state in which the first and second cylindrical portions 93 and 94 are elastically locked to the inclined surfaces 95 and 96 of the through hole 13 of the support body 9 via the end portion 10a of the filter element 10 is achieved.
The locking recess 97 is formed by the first tubular portion 93 and the second tubular portion 94.
An engaging projection 98 is formed for elastically engaging with.
The sleeve 91 is made of a material other than the heat-meltable synthetic resin, and may be, for example, a metal and a synthetic resin material, or may be made of a material such as rubber. The sleeve 91 does not have elasticity, and the end portion 10a of the filter element 10 is connected to the flow hole 13 by plastic deformation processing.
It may be fixed by pressing on.

In the embodiment shown in FIGS. 28 and 29, the support 9 and the end 10a of the filter element 10 are provided.
In connecting the and, it is not always necessary to integrally bond them, and the necessary condition is that (a) the filter element 10 does not separate from the support 9 when the wind pressure of the gas to be filtered acts. It is also necessary that (b) the airflow does not flow from the gap between the support 9 and the filter element 10 at the working wind pressure at the same time.
In order to achieve such two conditions (a) and (b), the support 9 is inserted from the inside of the cylindrical filter element 10.
The sleeve 91 is inserted into the through hole 13 and fixed by using fitting. The shape of the sleeve 91 is not limited to the above-described embodiment, but the tubular filter element 1 may be used.
It suffices that a force acts from the inside of 0 toward the flow hole 13 side.

Yet another embodiment of the present invention is shown in FIG. This embodiment is similar to the embodiment of FIGS. 28 and 29, but the flow hole 13 of the support 9 is formed in a truncated cone shape, and the end 10a of the filter element 10 is
A sleeve 101 having an outer shape of a truncated cone presses and fixes the inner peripheral surface of the through hole 13. The sleeve 101 is
It may be made of the same material as the sleeve 91 described above. A flow hole 102 is formed in the sleeve 101.

FIG. 31 is a sectional view showing a structure in which an end portion 10a of a filter element 10 of still another embodiment of the present invention is fixed by a sleeve 103 and connected by heat fusion, and FIG. 32 shows a part thereof. It is an expanded sectional view. The sleeve 103 includes a flange 104, a right-cylindrical first cylindrical portion 105 connected to the flange 104, and the first cylindrical portion 105.
And a second cylindrical portion 106 having a hollow truncated cone shape continuous with a flow passage hole 107. The filter element 10 is similar to the filter element described above, for example, the sheets 18a and 18b on the outside thereof are made of a heat-meltable synthetic resin material, and the support 9 is also made of a heat-meltable synthetic resin. Furthermore, the sleeve 103 is made of a synthetic resin material having a relatively low melting point, such as polyethylene and polypropylene. At the time of manufacturing, the end portion 10a of the filter element 10 is inserted into the through hole 13 of the support body 9 and the sleeve 10
3 is fitted and mounted, and then the sleeve 103, the end portion 10a of the filter element 10 and the support body 9 are heat-melted by using an ultrasonic vibrating horn or a heating rod, and as shown in FIG. Flange 1 of sleeve 103
A portion indicated by reference numeral 108 near 04 is melted to achieve airtightness.

As another embodiment of the present invention, the support 9 and at least the outer peripheral surface of the filter element 10 in the embodiment shown in FIGS. 31 and 32 may be made of a material other than the heat-meltable synthetic resin. . According to the configuration shown in FIGS. 31 and 32, the above-described FIGS.
As compared with the respective embodiments of No. 0, the support 9 and the end portion 10a of the filter element 10 can be connected more firmly, so that the wind pressure resistance can be improved, and the filter element 10 can be removed from the support 9 It can be more reliably prevented from coming off.

FIG. 33 is a partial sectional view of a filter element 10 according to another embodiment of the present invention. This filter element 10 is provided with a heat-melting synthetic resin sheet 18a similar to that described above on one surface on the inner peripheral surface side of the porous membrane 17, and on the outer peripheral surface side thereof is the same heat-melting synthetic resin. The seat 18b is provided, and another seat 18c is further provided outside the seat 18b. Sheet 18
c may be, for example, the above-mentioned non-woven fabric of aramid fiber. The sheet 18b serves to fix the porous film 17 and the sheet 18c. In the filter element 10 thus configured, the sheet 18c is made of a material other than the heat-melting synthetic resin, and the filter element 10 having such a configuration is supported by the configuration described with reference to FIG. It can be fixed to the body 9 by heat fusion.

FIG. 34 is a sectional view showing a manufacturing process of the filter device 8 according to one embodiment of the present invention. The filter element 10 is crushed such that the closed end 10c is within the axially projected virtual circle 114 of the remaining portion, as described above in connection with FIGS. 13-21. The filter element 10 is closed and the jig 111 is
Are individually stored in the plurality of storage recesses 112 formed in the. The storage recess 112 of the jig 111 is open upward and has a bottom 113. The end portion 10 a of the filter element 10 projects upward from the upper surface 116 of the jig 111.

Then, next, the support 9 is placed above the jig 111, and the end portion 10a of the filter element 10 is inserted into the through hole 13 formed in the support 9. Therefore, an ultrasonic vibrating horn or a heating rod is inserted into the end portion 10a of the filter element 10 so as to insert the both 9, 10a.
Connection by heat fusion is performed, and thus the configuration shown in FIG. 35 is realized. The number of storage recesses 112 of the jig 111 is less than or equal to the number of through holes 13 formed in the support 9 of the filter element 10, and the number of ultrasonic vibration horns or heating rods is the number of storage recesses 112. The number of vibration horns or heating rods may be set to the following, and the operation of inserting a plurality of vibrating horns or heating rods into the end 10a of the filter element 10 housed in the housing recess 112 and performing heat fusion is repeated, thereby All of the filter elements 10 housed in the housing recess 112 of the jig 111 are connected to the support body 9,
Then, a new filter element 10 is newly stored in the storage recess 112 of the jig 111, and the above-described operation is repeated. In this way, the manufacture of the filter device can be automated by a robot or the like. Therefore, it is easy to automate the work of mounting a large number of filter elements 10 such as 8000 on the support body 9,
Productivity is improved. The jig 111 has, for example, a vertical length of 10c.
It may have a configuration in which the storage recesses 112 are formed on the upper surface of m × horizontal 10 cm in a contiguous manner of 14 columns and 15 rows.

FIG. 36 is a partial sectional view of another embodiment of the present invention. In this embodiment, although similar to the above-mentioned embodiment, it should be noted that both end portions 10a and 10a1 of the filter element 10 which communicate with the through hole 15 of the support plate 9.
Is inserted and fixed using an adhesive or the like.

Yet another embodiment of the present invention is shown in FIG. In this embodiment, the bellows-like curved portion 29 is formed so that the filter element 10 can be easily curved.

[0102]

As described above, according to the present invention, since a filter device is realized by connecting a cylindrical filter element to a large number of through holes formed in a support, a filtering area can be realized with a compact structure. It is possible to increase the size of the filter, so that the filtration can be performed with a low pressure loss and the generation of dust can be prevented.

Further, according to the present invention, since the inner peripheral surface of the through hole of the support is connected to the outer peripheral surface of the filter element by heat fusion, it is not necessary to use an adhesive, and therefore the adhesive is used. Contamination of gas due to off-gas generated from is prevented.

Further, according to the present invention, the inner peripheral surface of the through hole of the support is formed so that the inner diameter becomes smaller from the one end of the filter element to the other end thereof, and the one end of the filter element has the through hole. Since the diameter of the filter element is increased along the inner peripheral surface of the filter and the particles are connected by heat fusion, the filter element and the support can be reliably fixed to each other.

Further, according to the present invention, the outward flange formed on the one end of the filter element and the support body are connected by heat fusion, which makes it possible to secure the fixing.

Further, according to the present invention, the support is made of a material other than the heat-melting synthetic resin, at least the outer peripheral surface of the filter element is made of the heat-melting synthetic resin, and the inner peripheral surface of the flow hole has an uneven shape. Or, conversely, at least the inner peripheral surface of the support is made of heat-meltable synthetic resin, and the outer peripheral surface of the filter element is made uneven, thus fixing the filter element and the support airtightly by the anchor effect during heat fusion. , Its strength can be improved.

Furthermore, according to the present invention, the outer peripheral surface of the filter element is airtightly pressed against the inner peripheral surface of the through hole of the support by using a sleeve, and it is necessary to use an adhesive also in such a structure. Since it disappears, it becomes possible to prevent the gas from being contaminated by the off-gas generated from the adhesive. By making the sleeve detachable, it is possible to easily replace the filter element when the filter element is damaged.

At least one of at least one of the inner peripheral surface of the support and the outer peripheral surface of the filter is made of a heat-meltable synthetic resin, and the sleeve is also made of a heat-meltable synthetic resin. The surface, the outer peripheral surface of the filter element, and the sleeve are connected to each other by heat fusion, so that the fixing strength can be improved and the airtightness can be improved.

Furthermore, according to the present invention, a locking recess is formed in the through hole of the support, and the sleeve is a locking projection that elastically locks in the locking recess through one end of the filter element. A portion is provided so that the sleeve can be attached and detached, and the filter element can be easily replaced.

Furthermore, according to the present invention, since the closed end of the sleeve is formed so as to be small within the virtual circle projected in the axial direction of the remaining portion, each of the recesses of the jig is accommodated. The filter element can be easily fitted and stored, the end projecting upward from the storage recess of the filter element can be inserted into the flow hole of the support, and the work of connecting by heat fusion can be automated. Will be improved. This means that it is important to improve the productivity, especially in a filter device provided with a large number of filter elements, and the present invention is preferably implemented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of a filter device 8 according to an embodiment of the present invention.

2 is a schematic perspective view showing a part of the filter device 8 shown in FIG. 1. FIG.

FIG. 3 is a vertical cross-sectional view of a part of the filter device 8.

4 is a plan view of the filter device 8. FIG.

5 is a perspective view of a filter medium 16 that constitutes the filter element 10. FIG.

FIG. 6 is a cross-sectional view of fibers of a core / sheath structure that form the sheets 18a and 18b.

FIG. 7 is a perspective view showing a filter medium 16 for forming a filter element 10 configured by spiral winding.

FIG. 8 is a perspective view showing a process of manufacturing the filter element 10 by spirally winding the filter medium 16.

9 is a sectional view of a part of the filter element 10. FIG.

FIG. 10 is a filter element 1 according to another embodiment of the present invention.
It is a perspective view of 0.

FIG. 11 is a cross-sectional view showing a connection structure by heat fusion between the end portion 10a of the filter element 10 and the support 9.

FIG. 12 is a cross-sectional view showing a process for achieving the connection structure by heat fusion shown in FIG. 11.

FIG. 13 is a side view of another embodiment of the filter element 10.

FIG. 14 is a bottom view showing an end portion 10c of the filter element 10 shown in FIG.

15 is a right side view of the filter element 10 shown in FIGS. 13 and 14. FIG.

16 is a cross-sectional view showing a process for forming the end portion 10c of the filter element 10. FIG.

FIG. 17 is a filter element 1 according to another embodiment of the present invention.
It is a bottom view which shows the edge part 10d of 0.

FIG. 18 is a front view showing a filter element 10 according to still another embodiment of the present invention.

19 is a bottom view showing an end portion 10e of the filter element 10 shown in FIG.

20 is a right side view of the filter element 10 shown in FIGS. 18 and 19. FIG.

FIG. 21 is a filter element 1 according to another embodiment of the present invention.
It is a bottom view which shows the edge part 10f of 0.

FIG. 22 is a cross-sectional view showing a connection structure of a filter element 10 and a support 9 by heat fusion according to still another embodiment of the present invention.

FIG. 23 is a filter element 1 according to another embodiment of the present invention.
It is sectional drawing which shows the structure by the heat fusion of the edge part 10a of 0, and the support body 9.

FIG. 24 is a filter element 1 according to another embodiment of the present invention.
It is sectional drawing which shows the connection structure by the heat fusion of the edge part 10a of 0, and the support body 9.

FIG. 25 is a partial cross-sectional view of still another embodiment of the present invention.

FIG. 26 is a filter element 1 according to another embodiment of the present invention.
It is sectional drawing which shows the connection structure by the heat fusion of the edge part 10a of 0, and the support body 9.

FIG. 27 is a cross-sectional view showing a connection structure by thermal fusion bonding showing a part of another embodiment of the present invention.

FIG. 28 is a cross-sectional view showing a connection structure between an end portion 10a of a filter element 10 and a support 9 using a sleeve according to still another embodiment of the present invention.

FIG. 29 is an exploded cross-sectional view showing a process for achieving the connection structure shown in FIG. 28.

FIG. 30 is a cross-sectional view showing a connection structure between an end 10a of a filter element 10 and a support 9 according to still another embodiment of the present invention.

FIG. 31 is a cross-sectional view showing a connection structure in which an end portion 10a of a filter element 10 and a support 9 according to still another embodiment of the present invention are further heat-sealed by using a sleeve.

32 is an enlarged cross-sectional view of a portion of the embodiment shown in FIG.

FIG. 33 is a filter element 1 according to another embodiment of the present invention.
It is a sectional view of a part of 0.

FIG. 34 is a cross-sectional view showing a process for manufacturing the filter device 10 according to the embodiment of the present invention.

35 is a sectional view of a part of the filter device 8 manufactured by the manufacturing method shown in FIG. 34.

FIG. 36 is a partial cross-sectional view of a filter device according to still another embodiment of the present invention.

FIG. 37 is a partial cross-sectional view of a filter according to still another embodiment of the present invention.

FIG. 38 is a perspective view of a portion of the prior art.

[Explanation of symbols]

8 Filter Device 9 Support 10 Filter Element 10a, 10b, 10c, 10d, 10e, 10f End 11 Frame 13 Flow Hole 16 Filter Media 17 Porous Membrane 18a, 18b Sheet 19 Fiber 20 Outer Layer 21 Inner Layer 23 Mandrel 91, 101, 103 Sleeve 97 locking recess 98 locking projection 111 jig 112 storage recess 113 bottom 114 virtual circle

Front page continued (72) Inventor Osamu Inoue No. 1 Nishiichitsuya, Settsu City, Osaka Prefecture Daikin Industries, Ltd. Yodogawa Manufacturing Co., Ltd. (72) Inventor Tomio Kusumi No. 1 Nishiichitsuya, Settsu City, Osaka Prefecture Daikin Industry Co., Ltd. Yodogawa, Ltd. Inside the factory (72) Inventor Shinichi Chaen 1-1, Nishiichitsuya, Settsu City, Osaka Prefecture Daikin Industries, Ltd. Yodogawa Factory (72) Inventor Jun Asano, Nishiichitsuya City, Osaka Prefecture Daikin Industries, Ltd. Yodogawa Factory (72) Inventor Shinki Uraoka 1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works (72) Inventor Shinji Tamaru Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works

Claims (11)

[Claims] 1. A support having a large number of flow holes, and a cylindrical filter element having one end inserted into the flow hole of the support and the other end closed and projecting from the support. At least one of at least the inner peripheral surface of the flow hole of the support, or at least one of the outer peripheral surface of the filter element is made of a heat-meltable synthetic resin, the inner peripheral surface of the flow hole of the support and the outer peripheral surface of the filter element A filter device that is connected by heat fusion. 2. The inner peripheral surface of the flow hole of the support is formed so that the inner diameter becomes smaller from the one end portion of the filter element to the other end portion, and the one end portion of the filter element is inside the flow hole. The filter device according to claim 1, wherein the filter device is expanded in diameter along the peripheral surface and is connected by heat fusion. 3. The filter element has an outward flange that covers an outer peripheral portion of the flow hole, and the flange and the support body are heat-sealed and connected to each other. The described filter device. 4. The support is made of a material other than a heat-meltable synthetic resin, at least the outer peripheral surface of the filter element is made of a heat-meltable synthetic resin, and the inner peripheral surface of the flow hole is a surface finished in an uneven shape. The filter device according to claim 1, wherein the filter device is provided. 5. The filter device according to claim 1, wherein at least the inner peripheral surface of the support is made of a heat-meltable synthetic resin, and the outer peripheral surface of the filter element has an uneven shape. 6. A support having a large number of through holes, a tubular filter element having one end inserted through the through holes of the support and the other end closed and extending projecting from the support, A sleeve that is fitted into the one end and has a flow hole through which gas flows, and a sleeve that presses the outer peripheral surface of the filter element in an airtight manner on the inner peripheral surface of the flow hole of the support. Filter device. 7. The filter device according to claim 6, wherein the sleeve is detachably fitted to the one end of the filter element. 8. At least one of at least one of the inner peripheral surface of the flow hole of the support and the at least outer peripheral surface of the filter element is made of a heat-meltable synthetic resin, and the sleeve is also made of a heat-meltable synthetic resin. 7. The filter device according to claim 6, wherein the inner peripheral surface of the through hole, the outer peripheral surface of the filter element, and the sleeve are connected by heat fusion. 9. A locking recess is formed in the flow hole of the support, and the sleeve has a locking projection that elastically locks in the locking recess through the one end of the filter element. The filter device according to claim 6, further comprising: 10. A porous membrane and a pair of sheets having a pore size larger than the pores of the porous membrane, laminated on both sides of the porous membrane and fixed by sandwiching, and made of a heat-meltable synthetic resin. , A tubular shape, one end of which in the axial direction is crushed so that one end in the axial direction falls within a virtual circle projected in the axial direction of the remaining portion, and at least the inner sheet of the pair of sheets is mutually crushed. A filter element characterized by being heat-sealed and closed. 11. A cylindrical filter element, wherein one end portion in the axial direction is crushed and closed so as to be included in a virtual circle projected in the axial direction of the remaining portion, the tubular filter element is provided for each filter element. With one end facing down, the plurality of bottomed storage recesses opened above the jig are individually stored, and the other end of the filter element projects above the jig. The other end of the filter element is inserted into the flow hole of the support having a large number of flow holes, and the other end of the filter element and the flow hole of the support are thermally fused and connected. A method for manufacturing a filter device, comprising: