JP2605397Y2 - Filter element - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter element having a novel structure.

[0002]

2. Description of the Related Art Conventionally, as a filter capable of increasing a filtration area, for example, a leaf filter disclosed in Japanese Utility Model Laid-Open No. Sho 59-176615 has been frequently used.

As shown in FIG. 6, this leaf filter is composed of two filter plates A, which are hollowed out in a donut shape.
A is overlapped, and for example, a wire mesh retainer B for the shape of a filtration chamber and porous plates C, C for reinforcement are arranged therebetween, and the outer peripheral edges of the filter plates A, A are welded. The filter plate A is made of a sintered body such as fine metal powder or metal fiber.

If the filter plate has a high precision, a protective screen may be laminated to protect the surface of the filter plate. Accordingly, a rim fitting D is attached to the inner hole of the filter plate A via a sealing member. Is done.

[0005] Such a leaf filter is stacked in multiple stages via, for example, a seal ring E and a spider-shaped rectifying bracket F, and an insertion tube G having a discharge hole is inserted through a central bore of the filter element, and is vertically moved. The filter device is constituted by tightening the.

In this filter device, the filtration area can be freely adjusted by arbitrarily adjusting the size and the number of sheets contained in such a leaf filter.

[0007]

However, since this leaf filter is joined by welding the outer peripheral edges of a filter plate which is a porous member to each other, the leaf filter not only reduces the yield due to cracking due to heat shrinkage, but also reduces the yield. Also, since it is a hollow disk shape, the number of processing steps is increased, and material loss is involved.

Further, as described above, this leaf filter uses a large number of members, increases the weight and increases the cost.

[0009] Further, in the filtration performance, although the flow path thickness is small near the outer peripheral edge and increases toward the center, the flow path in the circumferential cross section of each concentric circle is directed toward the center. Therefore, there is a problem to be solved in that a good flow cannot be obtained, and in particular, when the liquid to be treated is a highly viscous fluid such as a polymer, the filtration cannot be performed from the entire surface of the filter with a uniform pressure.

An object of the present invention is to provide a filter element which has a novel structure, is inexpensive, and can improve filtration performance.

[0011]

According to the present invention, there is provided a trunk member having a short cylindrical shape having both ends opened, and a guide hole communicating with the inner peripheral surface and the outer peripheral surface provided in the peripheral surface. At both ends of
A filter element comprising a filter material that covers the opening , and a pressing tool that presses the filter material from the other side, wherein a filter chamber is formed inside the body surrounded by the body member and the filter material, The filter material is fitted into a fitting portion provided on an inner peripheral side of the body member and / or the pressing tool, and an outer peripheral edge of the filter material is formed by a first pressing portion formed on the body member. The body member is disposed between the pressing member and a second pressing portion provided so as to face the same, and the body member is a mating surface between an outer peripheral surface of the body member and an outer peripheral surface of the pressing member.
Along with the pusher to integrate it with the
By holding the filter material between the first and second pressing parts by shrinking
Filter element.

[0012]

As described above, in the filter element of the present invention, the guide hole is formed around the short cylindrical body member, so that the filtration can be performed by effectively utilizing the substantially entire surface of the filter material. Is sandwiched between the pressing portion formed on the body member and the other pressing portion formed on the pressing member, so that leakage can be easily prevented.

[0013]

FIG. 1 shows an embodiment of a filter element according to the present invention. The filter element 1 is composed of a short cylindrical body member 3 having a guide hole 2 formed thereon and filter materials 4 and 4 covering both ends of the body member 3. , Thereby forming a filtration chamber 6 surrounded by the body member 3 and the filter materials 4 and 4.

The body member 3 is a metal member formed in a short cylindrical shape with both ends opened by machining, for example, a cylindrical shape in this example. The notch allows the fitting portion 11 of the filter material 4 to be inserted.
Is formed. The fitting portion 11 is concentric with the outer peripheral surface and perpendicular to the mating surface 20. The first pressing portion 13 is provided at the inner end of the fitting portion 11 and has a step facing outward.
An inclined surface from the pressing portion 13 to the inner peripheral surface is formed.

The body member 3 is provided with one or more conducting holes 2 passing through the outer peripheral surface and the inner peripheral surface. The conducting hole 2 is formed by a small-diameter tube 15.

The body member 3 has an outer diameter of 30 to 300, for example.
In addition to a circular short cylinder having a height of about 10 mm and a height of about 10 to 40 mm, it may be formed into an ellipse, a square, or the like.

The first pressing portion 13 sandwiches the filter material 4 between the first pressing portion 13 and a second pressing portion 23 formed on the pressing tool 5.

In the present embodiment, the pusher 5 is formed by cutting out the outer peripheral surface of a ring body having an outer peripheral surface having the same diameter as the outer peripheral surface of the trunk member 3, and joining the mating surface 20 in contact with the mating surface 10 of the trunk member 3.
A fitting portion 21 fitted into the fitting portion 11;
A second pressing portion 23 facing the pressing portion 13 and interposing the filter material 4 therebetween. In this example, the second pressing portion 2 is formed by a configuration in which the filter material 4 has a two-layer structure.
3 is formed wider than the first pressing portion 13.

The facing surfaces of the first and second pressing portions 13 and 23 may be flat surfaces, curved surfaces or a combination thereof, and the first pressing portion 13 may be flat and the second pressing portion 23
It is also preferable to provide several concentric ridges concentrically.

The body member 3, the filter material 4 and the pressing member 5
In this example, the body member 3 and the pressing tool 5 are pressed under a predetermined pressure.
Are welded along the mating surfaces 10 and 20 to be integrated. Further, the dimensions of each part are set to a size which ensures that the filter material 4 is pressed by the heat shrinkage accompanying the cooling of the melting part M and the sealing property is improved. In addition, as shown in FIG. 2, the molten portion M generated by welding is set so as not to reach the filter material 4.

As a result, even if the filter material 4 is made of fine particles, the heat transfer is small, and the occurrence of cracks and the like is suppressed. Also, depending on welding conditions, the pressing member 5 may be heated by heat that does not reach the point where the filter material 4 melts.
Diffusion bonding with the body member 3 enables more reliable integration. Preferably, as shown in FIG. 2, the welding portion is displaced from the filter material 4 by a distance H in the height direction. This distance varies depending on the size of the filter element 1, but is usually about 0.5 to 5 mm.

Although this embodiment shows an example in which the mating surfaces 10 and 20 are formed at right angles, the mating surfaces 10 and 20 may be formed with an inclination with respect to the outer peripheral surface of the body member 3, for example. This enables the filter material 4 to be pressed more strongly.

The filter material 4 may be made of metal,
A porous member obtained by sintering ceramic or other powder or fiber into a predetermined shape can be used. Still preferably, FIG.
As shown in FIG. 3, a composite of a support layer 4A having a large pore diameter and a relatively large thickness and a fine layer 4B of fine particles bonded to at least one side thereof is used.

This configuration makes it possible to suppress the pressure loss as a filtering characteristic and increase the mechanical strength. For example, the method of Japanese Patent Application No. 3-289087 previously proposed by the present applicant is applied. be able to. In this method, a support layer 4A previously formed by sintering is immersed in a suspension in which fine particles for forming a fine layer 4B are suspended, deposited by a suction method, and then sintered. Thus, the fine layer 4B having excellent uniformity can be formed thin. For the support layer 4A, it is preferable to use, for example, the fiber sintered body having elasticity.

In the filter element 1, in this embodiment, the filtrate flows from the outside to the inside of the filter element 1, and the fine layer 4B of the filter material 4 is arranged on the upstream side, but may be changed as appropriate. . Further, the pressing surface of the second pressing portion 23 that presses the fine layer 4B has a larger area as described above than the first pressing portion 13 that presses the support layer 4A. Reduces cracking. In this case, it can be seen that the support layer 4A is pressed more greatly than the fine layer 4B and is denser.

FIG. 3 shows another example of the holding portion of the filter material 4. As shown in FIG. In this example, the filter member 4 is made of one layer, and a large-sized one having a large area is used, so that a reinforcing member 9 such as a punching plate is employed. In the figure, in order to support the reinforcing member 9, an outward supporting surface 9A comprising a step is provided at the inner end of the inner peripheral surface of the body member 3, and the fitting portion 11 of the filter material 4 is formed on the pusher 5 side. It is an example.

The filter member 4 and the reinforcing member 9 may be formed separately from each other, or may be formed as an integral sintered product. The support layer 4A is also provided with a pore diameter gradient capable of sequentially expanding or reducing the pore diameter, for example, to improve the filtration characteristics, or to provide a protective layer (not shown) screen for protecting the outer surface of the filter material 4. Is also preferable.

The pressing member 5 holds the filter material 4 therebetween.
When integrated while sliding, as shown in FIG.
In order to prevent the abrasion of the pores and the dropping of particles of the filter material, a packing member 30 such as a pipe ring is provided between them. The packing member 30 made of a pipe ring body holds the filter member 4 by the body member 3 and the pressing tool 5 by elastic repulsion by flattening the cross section by pressing, and also seals between the fitting portion inner wall by expansion due to flattening. And the penetration of the object into the joint gap between the two can be prevented.

As shown in FIG. 5, for example, such a filter element 1 is formed by sequentially connecting the guide holes 2 provided in the element to the branch pipes L of the pipe K installed in the container J. And a filter device.
By appropriately setting the distance between the branch pipes L and the number of branch pipes L, the filtration area and the filtration characteristics can be improved.

As an example of the use of the filter element of the present invention, as a filter material for filtering an inert gas (N2 gas) having a supply pressure of 150 kgf / cm ³ , a metal having a fiber diameter of 4 μm or less and an aspect ratio of 2 to 50 is used. A fine layer 4B made of short fibers having a thickness of 1 mm or less and a fiber diameter of 4 to
It is preferable that a support layer 4A made of metal fibers of about 12 μm and having a thickness of about 2 mm or less is integrally sintered and bonded.

Applicants have also proposed other filters, for example:
It has been confirmed that a single-layer product obtained by sintering a relatively long metal short fiber having a fiber diameter of 1 μm and an average aspect of 500 to a porosity of 90% and a thickness of about 2 to 5 mm is also preferable. For example, the latter filter material has elasticity, and in addition to its high porosity and relatively thick thickness, excellent filtration characteristics can be obtained even if its filtration area is reduced. Suitable.

With the above-described structure, the filter element of the present invention does not melt the filter itself, thereby eliminating the problem that welding fumes and the like adhere to the filter material and contaminate it. It can be used to a great extent not only for filtering high-purity gas, but also for filtering pure water and general polymers.

[0033]

As described in detail above, the filter element of the present invention has a novel structure and can improve the filtration performance while having a sealing effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a filter element.

FIG. 2 is an enlarged sectional view showing a main part thereof.

FIG. 3 is an enlarged sectional view showing another embodiment.

FIG. 4 is a sectional view showing still another embodiment.

FIG. 5 is a cross-sectional view illustrating a filter device.

FIG. 6 is a perspective view showing a conventional leaf filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter element 2 Guide hole part 3 Body member 4 Filter material 5 Pusher 6 Filtration chamber 13 First pressing part 23 Second pressing part

──────────────────────────────────────────────────続 き Continued on the front page (58) Investigated field (Int.Cl. ⁷ , DB name) B01D 29/00-29/075 B01D 29/39-29/43 B01D 39/20 B01D 46/10

Claims (3)

(57) [Scope of request for utility model registration] 1. A torso member having a short cylindrical shape having both ends opened, and a guide hole formed in the inner peripheral surface and an outer peripheral surface thereof provided on the peripheral surface thereof, and covering the openings at both ends of the torso member. Filter material,
And a pusher for pressing the filter material from the other surface side, and a filter element having a filtration chamber formed therein surrounded by the body member and the filter material, wherein the filter material is the body. The filter member is fitted into a fitting portion provided on the inner peripheral side of the member and / or the pressing member, and an outer peripheral edge of the filter material is opposed to a first pressing portion formed on the body member so as to face the first pressing portion. The second provided on the pusher
The body member is disposed between the pressing member and the outer peripheral surface thereof.
And welded along the mating surface of the pusher and the outer peripheral surface of the pusher
And filter material by heat shrinkage
Filter element sandwiched between first and second pressing parts
G. 2. The filter material according to claim 1, wherein said filter material has relatively large holes.
A support layer and a fine layer of microvoids integrally bonded to the support layer
2. The composite sintered product according to claim 1, wherein
Filter element. 3. The filter according to claim 2, wherein the mating surface is different from the filter material.
4. The filter according to claim 2, wherein the filter is formed at a predetermined height.
Luther element.