JP2605200Y2 - Filter media support - 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 medium support for supporting a filter medium, and more particularly to a filter medium support most suitable for a filter medium for filtering a polymer.

[0002]

2. Description of the Related Art Various filters have conventionally been used to remove foreign substances, gels, and the like in a molten polymer.
Various types of filter media are known, for example, those obtained by sintering metal powder and metal fibers. A filter medium made of such a sintered body of metal powder or metal fiber has the advantage that it can be formed into a thin layer even with a thin layer.However, since the filter medium alone cannot withstand the filtration pressure, a filter medium such as punching metal is usually used. It is used in a structure supported by a filter medium support made of a perforated plate. Conventionally, a filter medium support made of a perforated plate such as a punched metal has been formed by perforating a large number of holes of a fixed size.

[0003] A filtering device is constructed by incorporating one or a plurality of the above-described combinations of the filter medium and the filter medium support. In the filter apparatus, a combination of the filter medium and the filter medium support is used. On the upstream side and / or downstream side of the device, the fluid to be filtered is often caused to flow in the radial direction due to the configuration or specifications of the device.

However, such an apparatus in which the fluid to be filtered flows radially upstream and / or downstream of the combination of the filter medium and the filter medium support has the following problems.

[0005] First, a typical configuration of a conventional filter medium support, a filter device using the filter medium, and a usage mode thereof will be described. As shown in FIG. 8, the filter medium 1 is supported by a filter medium support 2 made of a perforated plate such as punched metal having a large number of holes of a fixed size, and a filter element 4 is formed by incorporating a retainer 3 therein. Is done.
On the inner peripheral side, a hub 5 having a hole or groove 5A, a spoke-like spacer 6 extending radially between the filter elements 4
Is provided, and a plurality of filter elements 4 are usually assembled in a support 7 in a stacked state. The fluid to be filtered, for example, the polymer 8 is introduced into the space 9 defined by the spacers 6 between the filter elements 4 as shown by the arrows, flows in the radial direction and is sequentially filtered through the filter medium 1, and is filtered. After passing through 2, it flows inside the retainer 3 toward the inner diameter side, and flows into the column 7 through the hole or groove 5A of the hub 5 and the hole 7A of the column 7. Although not shown, it is also possible to adopt a configuration in which the polymer flows from the inner diameter side to the outer diameter side of the filter element, is filtered by a filter medium, and is collected on the outer diameter side of the filter element.

In the filter device having the structure shown in FIG. 8, the polymer enters the retainer 3 from the space 9 between the filter elements 4 through the filter medium 1 and the filter medium support 2 and flows through the retainer 3 in the radial direction. However, the flow in the radial direction in the retainer 3 receives a greater resistance than the flow in other portions. Therefore, the polymer flowing from the space 9 to the outer diameter side of the retainer 3 is
It is difficult for the polymer to flow through the retainer 3 in the radial direction, and the polymer flowing into the radial direction of the retainer 3 flows more easily through the retainer 3 in the radial direction. As described above, as a result of the difference in the ease of flow (resistance) in the radial direction between the outer diameter side and the inner diameter side, the flow rate of the polymer flowing from the space 9 into the filter medium 1 becomes non-uniform. That is, in terms of the unit area of the filter medium 1, the flow rate of the polymer flowing into the inside of the space 9 to the inner diameter side and flowing into the filter medium 1 from the inner diameter side of the filter medium 1 is larger than the flow rate of the polymer flowing into the filter medium 1 from the outer diameter side of the filter medium 1. More. As a result, the inner diameter side of the filter medium 1 is clogged earlier in the initial stage, the resistance of this portion gradually increases due to the clogged state, the flow rate decreases, and the more the outer diameter side of the filter medium 1 sequentially increases, Polymer flows in. Therefore, in the latter stage of use in which the clogging state on the inner diameter side of the filter medium 1 has advanced in the end, the outer diameter side of the filter medium 1 also effectively performs a filtering action for a considerably large flow rate. Since the outer diameter side of the filter medium 1 was hardly used effectively at the initial stage, a gelled polymer or a deteriorated polymer was generated in this portion, and the outer diameter side of the filter medium 1 began to be effectively used. In addition, there is a problem that a gelled polymer or a deteriorated polymer flows out downstream. In particular, when a wire mesh is used as the retainer 3, the flow resistance in the radial direction is extremely large. Therefore, in the early stage of use, there is a strong possibility that the polymer hardly flows into the outer diameter side of the retainer 3 from the space 9 at the initial stage. In addition, the problem of the gelled polymer and the deteriorated polymer appears remarkably. In addition, if the use of the filter element 4 is stopped or replaced before such a problem occurs, the use of the filter element 1 may be stopped or replaced without the outer diameter side of the filter medium 1 being effectively used for filtration. , The life of the filter medium 1 is shortened.

In order to cope with such a problem, there are known a method of giving a large resistance to the spoke-shaped spacers 6 extending radially, and a method of interposing a wire netting for giving a flow path resistance in the space 9. I have. However, in the former method, it is difficult to make the polymer flow rates on the inner diameter side and the outer diameter side of the filter medium 1 uniform, and in the latter method, the resistance of the entire filter device increases due to the resistance of the wire mesh, and the initial filtration pressure increases. However, there is a problem that the actual use becomes difficult due to the excessively high cost.

[0008]

SUMMARY OF THE INVENTION The present invention focuses on the above-mentioned problems and provides a filter medium supported by a filter medium support.
An object of the present invention is to equalize the flow rate of a fluid to be filtered through a filter medium on the inner and outer peripheral sides.

[0009]

According to the present invention, there is provided a filter medium support according to the present invention, which supports a filter medium and has a plurality of fluid passages penetrating in a thickness direction through which a fluid to be filtered passes. , The cross-sectional area of each of the plurality of fluid passages,
Not to so that gradually changing in the radial direction of the filter medium support
You.

The plurality of fluid passages are formed as follows.
It is possible. That is, the large number of fluid passages include, for example, a large number of holes arranged concentrically, and among the large number of holes arranged concentrically, the holes arranged on the same concentric circle each have a predetermined cross section. The holes having an area and arranged on different concentric circles have a gradually decreasing cross-sectional area in the radial direction inside or outside the filter medium support. A large number of fluid passages whose cross-sectional area gradually changes in the radial direction can be processed by etching. By performing processing by etching instead of punching, the aperture ratio can be increased.

However, the filter medium support of the present invention is different from the above.
Has a different configuration. That is, the filter medium support according to the present invention
The body is a filter medium support formed by winding at least one wire including at least a corrugated wire in a spiral shape in a surface direction along a corrugated surface of the corrugated wire to form a disc shape, The characteristic feature is that the pitch of the waveform is gradually changed in a constant direction with respect to the magnitude relationship in the radial direction of the filter medium support.
What you do.

The above-mentioned wire may be composed of one kind of corrugated wire, but it is composed of two kinds of wire, that is, a corrugated wire and a wire that extends straight, and these are alternately arranged in the radial direction of the filter medium support. It is desirable to be spirally wound. The spirally wound wires are joined together by sintering between adjacent spirally wound layers to form a disk-shaped filter medium support.

The change in the corrugated pitch of the corrugated wire may be determined by the flow direction of the fluid to be filtered (for example, a polymer) with respect to the filter medium (with respect to the filter medium support). Since the aperture ratio in the filter medium support changes due to the change in the pitch, the change in the pitch may be determined so that the aperture ratio becomes smaller in a portion where more resistance is desired (a portion where the flow rate is to be suppressed).

[0014]

In the filter device using such a filter medium support, the cross-sectional area of each of the plurality of fluid passages of the filter medium support is gradually changed in the radial direction of the filter medium support, so that the flow rate can be further reduced. The flow path cross-sectional area of the fluid passage at the desired part is smaller, and the flow path cross-sectional area of the fluid passage at the part where the passing flow rate is desired to be further increased is set larger. As a result, the flow of the fluid to be filtered, which is going to pass through the filter medium supported by the filter medium support, can be intentionally given a resistance corresponding to a change in the flow path cross-sectional area of the fluid passage. Accordingly, it is possible to make the passing flow rate uniform on the inner and outer peripheral sides of the filter medium.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show one example for comparison with the present invention.
5 shows a filter medium support according to a comparative example and a filter device using the filter medium support. FIG. 1 shows a part of a filter device, and 11 shows a filter medium support 11.
A filter medium 20 made of a sintered body of metal powder or metal fiber or the like is supported by the filter medium support 11, and a pair of filter medium 20 and a retainer 21 are interposed between the filter medium supports 11 to form a set of filter elements 22. I have. A hub 23 having a hole or groove 23 </ b> A is provided on the inner peripheral side, and a spoke-shaped spacer 24 that extends radially and has relatively small flow resistance is provided between the filter elements 22. These filter elements 22 are incorporated into a plurality of columns 25. The fluid 26 to be filtered flows into the space 27 between the filter elements 22 defined by the spoke-shaped spacers 24 as shown by the arrows, passes through the filter medium 20 and the filter medium support 11, flows into the retainer 21, and And flows into the column 25 from the hole or groove 23A of the hub 23 through the hole 25A of the column 25.

As shown in FIG. 2, the filter medium support 11 penetrates in the thickness direction of the filter medium support 11 and has a plurality of fluid passages whose flow path cross-sectional areas gradually change in the radial direction of the filter medium support 11. It has a number of holes 12. In this embodiment, the holes 12
Is set so as to gradually decrease toward the inside in the radial direction. However, the direction of change of this cross-sectional area is
What is necessary is just to determine according to the flow direction of the upstream side and the downstream side of the filter medium support 11 and the filter medium 20, and it may be set so that the part which wants to give resistance by the flow of the passing fluid may be made smaller as described later.

The large number of holes 12 are arranged concentrically, and among the large number of holes 12 arranged concentrically, the holes 12 arranged on the same concentric circle each have a constant cross-sectional area. I have. The holes 12 arranged on different concentric circles
However, as described above, the cross-sectional area is gradually reduced toward the radially inward direction of the filter medium support 11.

The large number of holes 12 are processed by etching. In the punching process, it is difficult to increase the aperture ratio. However, by performing the etching process, the aperture ratio can be easily increased, and the resistance of the filter medium support 11 as a whole can be kept low.

In the device configured as described above, the fluid that has flowed into the space 27 tends to flow in a large amount toward the inner diameter side because the flow resistance in the space 27 is small. However, in the flow path passing through the filter medium 20 and the filter medium support 11, the resistance is increased toward the inner diameter side of the filter medium support 11, so that the flow rate of the fluid flowing into the filter medium 20 from the inner diameter side is higher. Can be suppressed. The change in the resistance in the radial direction of the filter medium support 11 is caused by the large number of holes 1 as described above.
2 is set so as to gradually decrease toward the inside in the radial direction. By appropriately setting the change in the resistance in the radial direction, the filter medium 20 is formed.
The flow rate of flow into the tank is made uniform in the radial direction. Further, as described above, in the retainer 21 portion, the resistance to the flow in the inner diameter direction is larger on the outer diameter side and smaller on the inner diameter side, but the filter medium support is set so as to cancel the magnitude relation of the resistance. Eleven changes in resistance are determined. Therefore, filter medium 2
From 0 to the end of the retainer 21, and in some cases, from the space 27 to the end of the retainer 21, the resistance is uniform in the radial direction.

When the flow rate through the filter medium 20 is made uniform in the radial direction, the filter medium 20 is used under substantially the same conditions in the entire radial direction from the initial stage of use, as in the prior art. A specific part in the stage (for example, the outer diameter side part)
Therefore, the flow rate of the polymer is extremely small (or stays), and the polymer does not gel or deteriorate. In addition, since the filter medium 20 is effectively used for filtration under substantially the same conditions in the entire radial direction from the initial stage of use, the entire area of the filter medium 20 reaches the end of life at substantially the same time. As a result, compared to the case where the degree of effective use was uneven in the radial direction,
Life is greatly extended. In addition, since the conditions of the passing flow rate are the same in the radial direction, the conditions for capturing the foreign matter and the like in the fluid by the filter medium 20 are also uniformed, the capture leakage and the like are prevented, and the target filtration performance is reliably exhibited. It will be like that.

The change in the cross-sectional area of the hole 12 is intended to ultimately change the radial resistance of the filter medium support, thereby making the flow rate of the filter medium uniform in the radial direction. For example, assuming an apparatus in which the flow direction of the fluid between the filter elements is opposite to that shown in FIG. 2, the diameter of the filter medium support is adjusted so that the flow rate of the filter medium can be made uniform according to the apparatus. A change in resistance in the direction (therefore, a change in the sectional area of the hole 12) may be provided.

FIGS. 3 to 5 show a filter medium support according to an embodiment of the present invention. Since the filter device conforms to the comparative example, only the filter medium support will be described here. As shown in FIGS. 3 and 4, the filter medium support 31 includes a corrugated wire 32 and a straight wire 33.
And two types of wire rods. These two kinds of wires 3
The two wires are spirally wound as a set such that the wires 2 and 33 are alternately arranged in the surface direction along the surface of the corrugated wire 32 in the waveform bending direction and in the radial direction of the filter medium support 31. The wires 32 and 33 wound in a spiral shape are between the wires 32 and 33,
And between the adjacent spirally wound layers are sintered or brazed to each other.

The corrugated pitch P of the corrugated wire 32 is gradually changed in the radial direction so as to be larger on the inner diameter side and smaller on the outer diameter side when viewed in the radial direction of the filter medium support 31. Such a change in the pitch P of the waveform can be easily achieved by winding the wires 32 and 33 as follows.

That is, as shown in FIG.
In winding the wires 32, 33 in a spiral shape on the winding drive source 35, a winding torque T of the winding drive source 35,
And / or by gradually reducing the braking force B of the supply wires 32, 33 controlled by the brake 37 via the nip roll 36 (or unwinding device: not shown) as the winding diameter increases, The corrugated wire 32 is further elongated, and the corrugated wire 32 is further contracted on the outer diameter side, so that the above-described change in the pitch P of the waveform is obtained.

In the disk-shaped filter medium support 31 formed as shown in FIG. 3, by gradually changing the pitch P of the waveform of the corrugated wire 32, the distance between the wires 33 is reduced toward the inner diameter side and the outer diameter is reduced. Coupled with the fact that the distance between the wire members 33 becomes larger toward the side, the opening ratio becomes smaller toward the inner diameter side, and becomes larger toward the outer diameter side. Therefore, the resistance to the passing fluid is higher on the inner diameter side and lower on the outer diameter side.

In the filter medium support 31, as shown in FIG. 4, each wire 32, 33 is formed of a flat wire having a width d larger than the thickness t, t '. Is preferred. With such a configuration, a large aperture ratio and a small resistance can be achieved while maintaining sufficient strength as a filter medium support.

The filter medium support 31 constructed as described above
Is incorporated into the filter device, for example, in a manner similar to that shown in FIG. As described above, the flow rate of the fluid flowing into the filter medium tends to increase toward the inner diameter side.
Is configured to increase toward the inner diameter side, and by appropriately setting the change in the resistance, it is possible to make the flow rate of the filter medium uniform in the radial direction. That is, the same operation and effect as those of the comparative example can be obtained.

In the above embodiment, the corrugated wire 3
Although the filter medium support 31 was formed such that the pitch P of the waveform 2 became larger toward the inner diameter side, depending on the shape of the spirally wound corrugated wire (corrugated pitch in free state, corrugated height), conversely. In some cases, the smaller the pitch of the waveform toward the inner diameter, the smaller the aperture ratio (and thus the greater the resistance) on the inner diameter. In such a case, as shown in FIG. 6, for example, as shown in FIG. 6, the winding torque T of the winding drive source 35 and / or the braking force B of the brake 37 are made smaller toward the inner diameter side, and are gradually reduced as the winding is increased. You can control it to be larger.

The direction in which the pitch of the corrugated wire is changed in the radial direction may be determined according to, for example, the flow direction of the fluid between the filter elements, and may be reversed. That is, a change in the resistance in the radial direction of the filter medium support (and a change in the pitch of the corrugated wire) may be provided so that the flow rate of the filter medium can be made uniform.

Further, the filter medium support can be composed of only a corrugated wire. As shown in FIG. 7, a part of the filter medium support 41, the corrugated wire 42 is spirally wound so as to generate a predetermined pitch change, and then the corrugated wires 42 are joined together by sintering, brazing, or the like. A filter medium support 41 having a desired radial resistance change is configured.

[0031]

As described above, when the filter medium support of the present invention is used, the cross-sectional area of each of the plurality of fluid passages is gradually changed in the radial direction of the filter medium support to thereby provide the filter medium support. In addition, a desirable change in the resistance in the radial direction can be provided, whereby the flow rate of the filter medium can be made uniform in the radial direction. By this homogenization, the entire filter medium can be used for filtration under substantially the same conditions from the initial stage of use, and it is possible to prevent gelation and deterioration of the polymer in a specific portion,
An extremely high-performance and highly reliable filter device can be realized. In addition, since the entire filter medium can be effectively used from an early stage of use, the life of the filter medium can be greatly extended.
Further, the radial uniformization can be achieved by the characteristics of the filter medium support itself, and does not require a special member between the filter elements and the like. And the filter device can be simplified.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view of a filter device using a filter medium support according to a comparative example of the present invention.

FIG. 2 is a plan view of the filter medium support of FIG.

FIG. 3 is a plan view of a filter medium support according to an embodiment of the present invention.

FIG. 4 is a partially enlarged perspective view of the filter medium support of FIG. 3;

FIG. 5 is a schematic configuration diagram of an apparatus showing a winding state of a filter medium support of FIG. 3;

FIG. 6 is a schematic configuration diagram of an apparatus showing a wound state of a filter medium support according to a modification of FIG. 3;

FIG. 7 is a partial perspective view of a filter medium support according to another modification of FIG. 3;

FIG. 8 is a partial longitudinal sectional view of a conventional filter device.

[Explanation of symbols]

 11, 31, 41 Filter medium support 12 hole 20 Filter medium 21 Retainer 22 Filter element 23 Hub 24 Spacer 25 Support 26 Fluid 27 Space 32, 42 Waveform wire 33 Straight wire 34 Winding core 35 Winding drive source 36 Nip roll 37 Brake

Claims (4)

(57) [Scope of request for utility model registration] Claims: 1. At least including a corrugated wire
Aspects of a type of wire rod along the surface of the corrugated wire rod
A filter media support wound spirally in the direction
Therefore, the pitch of the waveform of the corrugated wire is set to
The size relationship was gradually changed in a certain direction
A filter medium support characterized by the above-mentioned. 2. The method according to claim 1 , wherein the wire is straight with the corrugated wire.
The corrugated wire and a straight wire
Wire rods are alternately arranged in the radial direction of the filter media support.
The claim in which the corrugated wire and the straight wire are spirally wound.
Item 7. The filter medium support of Item 1. 3. The filter according to claim 2, wherein the pitch of the waveform of the corrugated wire is a filter material support.
Claim 1 or Claim 2 which becomes large so that it goes to a holding body radial direction inside.
2. Filter media support. 4. The helically wound wire rods are adjacent to each other.
Sintered between braided layers, joined by brazing, etc.
The filter medium support according to any one of claims 1 to 3, wherein
body.