JP3429360B2 - Hub ring for filter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hub ring for a filter, and more particularly to a structure of a hub ring for a filter which is most suitable for a polymer filter used by laminating a plurality of sheets.

[0002]

2. Description of the Related Art Disc-shaped filters have been conventionally known as filters for polymer filtration, so-called leaf disc filters, and disc-shaped filter members which are laminated on the upper and lower sides of a retainer. A three-layer type for assembling a filter element is known. Such filters are often used by laminating the number of sheets according to the capacity of filtration (flow rate of molten polymer to be filtered). To use by stacking,
Since it is necessary to seal the polymers before and after filtration with each other, a hub ring is provided on the inner peripheral side of each filter, and in some cases on the outer peripheral side. This hub ring has
As described above, it plays a role of sealing the polymers before and after filtration to ensure the passage of the filtered polymer and maintaining the laminated filters in a predetermined positional relationship (for example, a predetermined interval).

As a structure of a conventional representative hub ring for a filter, for example, a structure shown in FIG. 10 is known. FIG. 10 shows a part of the inner peripheral side of the leaf disk type filter 101, in which the filter medium 1 is provided on both sides of the retainer 102 with porous plates 103 (for example, punching metal) interposed therebetween.
04 are provided. A hub ring 105 is provided on the inner circumference of the filter 101, and a large number of small holes 106 are formed in the hub ring 105 along the circumferential direction. The molten polymer 107 that flows into the filter medium 104 from both sides of the filter 101 and is filtered by the filter medium 104
Are collected from the retainer 102 through the small hole 106 of the hub ring 105 in the central portion as indicated by the arrow, and sent to the next step.

When a plurality of filters 101 are stacked, a predetermined number of filters 101 are attached to the cylindrical support 108.
Are fitted and laminated, and the interval between the filter media 104 of each filter 101 is determined based on the hub ring 105 portion. Hub ring 105 of each laminated filter 101
Is tightened from above with a pressure sufficient to seal the polymer before and after filtration, for example, with a large total tightening force of about 5 to 10 tons.

[0005]

In the conventional structure as described above, the following problems remain. First,
The hub ring 105 is provided with a large number of small holes 106 for passing the polymer after filtration, but the aperture ratio is at most 20%.
This is the reason why this small aperture ratio causes a large pressure loss at this portion. Although it is conceivable to increase the hole diameter in order to increase the aperture ratio, the size of the hole diameter has its own limit when considering the large tightening force as described above.

Further, in the small hole drilling structure, there is a possibility that the peripheral portion of the small hole 106 forms a large dead space for the flow of the polymer when viewed from the polymer inflow side.
The dead space causes stagnation in the polymer, but the stagnation leads to deterioration of the polymer and further outflow of the deteriorated polymer, and therefore it should be prevented as much as possible.

Further, the small hole 106 has a hub ring 105.
Since it has to be bored in the radial direction, it is relatively difficult to process and requires time to process, and the manufacturing cost of the hub ring 105 is relatively high.

The object of the present invention is to pay attention to the above-mentioned problems and to make the opening ratio of the polymer passage large so that the pressure loss is extremely low, the retention is extremely unlikely to occur, and the production is easy and inexpensive. The purpose is to provide a structure of a hub ring for a filter.

[0009]

Means for Solving the Problems A filter hub ring according to the present invention for this purpose is a hub ring provided on at least one of an inner circumference and an outer circumference of a disk-shaped filter, and is arranged to face each other with a space (a). A pressing plate composed of a pair of annular flat plate members extending in an annular shape; and (b) an annular extending member interposed between the pair of pressing plates, the pair being substantially perpendicular to the pair of pressing plates. A plurality of supporting pieces extending in the radial direction of the hub ring at the same time as extending over the holding plates of the holding plate, and a supporting member having an annular piece to which the plurality of supporting pieces are connected and arranged at intervals in the circumferential direction of the hub ring. The above
A large number of supporting pieces are flat plate-shaped members that are the materials for the supporting members.
A large number of cuts are engraved at a predetermined interval on the
Is formed by twisting 90 degrees in the same direction
The ring-shaped piece is formed by engraving a cut in the flat plate-shaped member.
It is characterized in that it is formed from a portion which is not formed .

The annular piece of the supporting member is connected to either the outer diameter side or the inner diameter side of the hub ring of a large number of arranged support pieces so that the arrangement of the large number of support pieces can be maintained in a predetermined shape. Good. Further, as will be described in detail in Examples to be described later, the large number of supporting pieces has a large number of radially extending cuts on the inner peripheral side or the outer peripheral side of a simple annular flat plate-like member, and the gap between the cuts is 90 degrees. Although it is easily formed by twisting, it is possible to easily perform this processing and to make the formed support piece have a large compressive strength between the pair of holding plates. Stainless steel is preferable as the material.

[0011]

In such a hub ring for a filter, a large number of supporting pieces extending in a direction substantially perpendicular to the pair of holding plates are interposed between the pair of holding plates.
A space between the support pieces adjacent to each other extends in the radial direction,
Formed in the passage of filtered polymer. At the site where the above-mentioned many supporting pieces are interposed between the pair of holding plates,
All the parts other than the support piece function as a passage for the polymer. Therefore, compared with the conventional structure having a large dead space in which small holes are provided, the opening ratio of the polymer passage is significantly increased, and the pressure loss is significantly reduced.

The support piece extends in a direction substantially perpendicular to the pair of holding plates and functions as a hard rod (plate) against a compressive load applied to the pair of holding plates, and they buckle. As long as the above does not occur, for example, it is possible to exhibit extremely high compression resistance strength as compared with a member in which a simple wire-like member is formed in a wave shape. Since the dimension between the pair of holding plates is not so large and is at most about 5 mm, the supporting piece does not buckle. Therefore, even if a large compressive load is applied between the pair of pressing plates, that is, even if a large tightening force is applied to each hub ring laminated by the laminated structure of the plurality of filters, the hub ring is not deformed and Large polymer passages are maintained in shape without problems.

The annular piece to which a large number of supporting pieces are connected is located on the outer diameter side or the inner diameter side of the annularly arranged supporting pieces. The space between the annular piece and the pair of holding plates functions as a passage for the filtered polymer. Therefore, even in this portion, a large opening ratio of the polymer passage is secured,
The pressure loss is kept small.

By thus increasing the aperture ratio, the pressure loss of the hub ring as a whole can be suppressed to a very small level, and in the polymer passage in the hub ring, there is no portion where polymer may remain, and the polymer is filtered. The entire amount of the polymer can smoothly pass through the hub ring.

Further, in the hub ring according to the present invention, the holding plate consisting of a pair of belt-shaped flat plate members extending in an annular shape and the supporting member having the support piece and the annular piece can be separately manufactured. That is, the support member
As described above, a large number of cuts extending in the radial direction are formed on the inner peripheral side or the outer peripheral side of the annular flat plate-like member, and the gap between the cuts can be twisted by 90 degrees to easily manufacture. Also, if each holding plate and the supporting member are appropriately joined by welding or the like,
These members can be made into one piece, and a hub ring having extremely excellent handleability can be manufactured. As described above, not only each member constituting the hub ring but also the entire hub ring can be manufactured very easily, mass production can be performed in a short time, and the manufacturing cost is significantly reduced as compared with the conventional one.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the filter hub ring of the present invention will be described below with reference to the drawings. 1 to 5 show a hub ring for a filter according to an embodiment of the present invention. 1 to 3, reference numeral 1 denotes the entire leaf disk type filter, and the drawings show the periphery of the hub ring 2. Filter 1 is
The retainer 3 arranged in the central portion in the thickness direction, the porous plates 4 arranged on both sides of the retainer 3, the filter medium 5 arranged outside each porous plate 4, and the inner circumference of the filter 1. And a hub ring 2 disposed on the. When a predetermined number of filters 1 are stacked, each filter 1
In order to secure a predetermined polymer flow path therebetween, in this embodiment, a spacer 6 made of a ring-shaped member having a predetermined thickness is interposed between the hub rings 2. The molten polymer 7 to be filtered is filtered by the filter medium 5 as shown by the arrow, then passes through the porous plate 4 and the retainer 3 part, passes through the hub ring 2, and is collected in the central support column 8 to Sent to the process. Although the spacer 6 is a separate member from the hub ring 2 in this embodiment, it may be integrated with the hub ring 2. Further, the structure of the hub ring according to the present invention is
It can also be applied to a filter in which a hub ring is arranged on the outer circumference.

The hub ring 2 is composed of a pair of upper and lower holding plates 9a and 9b, which are annularly extending strip-shaped flat plate members and are opposed to each other at a predetermined interval, and an annular extending support interposed between the two holding plates 9a and 9b. And a member 10. As shown in FIGS. 4 and 5, the support member 10 includes
A large number of support pieces 10a, which extend in a direction substantially perpendicular to the pair of pressing plates 9a and 9b and extend between the pair of pressing plates 9a and 9b and extend in the hub ring radial direction (radial direction), are arranged at intervals in the hub ring circumferential direction. It is set up. The large number of support pieces 10a corresponds to the large number of support pieces 10a.
The outer diameter side of the hub ring is connected to the annular piece 10b.

The large number of support pieces 10a can be formed, for example, as follows. As shown in FIG. 6, a large number of cuts 12 (slits) extending in the radial direction are formed at predetermined intervals on the inner peripheral side of a simple annular flat plate-like member 11 having a predetermined thickness, and a portion 13 between adjacent cuts 12 is formed. , Twist 90 degrees in the same direction with an appropriate jig (not shown). At this time, break 12
The non-engraved annular part 14 is located exactly in the center of the gap part 13 which is twisted 90 degrees. As a result, the inter-cut portions 13 twisted by 90 degrees are aligned in height and position with respect to the annular portion 14 in a direction perpendicular to the annular portion 14. The 90-degree-twisted gap portion 13 can form the large number of supporting pieces 10a, and the uncut notched annular portion 14 can form the annular piece 10b.

Such processing can be easily performed if, for example, the annular flat plate-like member 11 as a material is made of stainless steel having a thickness of about 1 mm. Generally, work hardening can be expected for stainless steel, and it becomes possible for the support piece 10a formed by being twisted by 90 degrees described above to have great rigidity against bending and buckling when a compressive load is applied. . In particular, if it is made of cold-rolled stainless steel material such as CSPH material, it can be expected to have a large work hardening and can have extremely large rigidity. Even if the thickness is about 0.6 mm, the laminated filter can be tightened. It is possible to provide a strength that can sufficiently withstand a compressive load due to a force or polymer pressure, that is, high strength that does not deform even when such a compressive load is applied. When a high-strength material such as a CSPH material is used, the cuts (slits) in the above-described processing have a certain width, that is, a band-shaped portion having a certain width is cut from the material, and the cut portion is cut. It is also possible to widen the interval between them and widen the arrangement pitch of the support pieces formed by being twisted by 90 degrees. With a high-strength material, a sufficiently large pressure resistance can be provided even if the support pieces are arranged at a large pitch.

In the hub ring for a filter as described above, the molten polymer 7 which is filtered by the filter medium 5 and flows into the hub ring 2 from the retainer 3 part is pressed by both presser plates 9.
Collected into the struts 8 through the polymer passages 15 formed between a and 9b. Between both presser plates 9a and 9b,
First, looking at the portion where the support pieces 10a are arranged in a ring, in this portion, the space other than the support pieces 10a is
Since it is entirely formed as the polymer passage 15, an extremely large aperture ratio can be obtained as compared with the conventional small hole drilling structure and the like. The aperture ratio is calculated from the plate thickness of the support piece 10a, the arrangement pitch, and the diameter of the inner end of the support piece 10a. In designing, the hub ring 2 has sufficient deformation resistance against the compressive load applied to the pressing plates 9a and 9b, that is, the tightening force applied to the hub ring 2 portion when a plurality of filters 1 are stacked and assembled. However, it is easy to set the aperture ratio to 40% or more, preferably 45% or more, while having a sufficiently high deformation resistance strength against a large pressure such as a total tightening force of about 10 tons or more. be able to.

For example, in the supporting member 10 according to this embodiment shown in FIG. 4, the thickness of the supporting piece 10a is 1 mm, and the supporting piece 1 is
Since the distance between the adjacent supporting pieces at the inner end portion of 0a was 2.5 mm, a large aperture ratio of about 71% could be realized.
With the same arrangement pitch of the support pieces 10a, the support pieces 10a
If the thickness is about 0.6 mm, for example, the aperture ratio becomes as large as about 83%.

At the portion where the annular piece 10b is located, the annular piece 10b partially obstructs the polymer passage 15 as shown in FIG. Since it only intervenes, it does not cause a large resistance, and a large aperture ratio is easily secured even in this portion.

For example, the distance between the pair of pressing plates 9a and 9b is 2.5 mm, the thickness of the supporting member 10, that is, the annular piece 10b.
With a thickness of 1 mm, a large aperture ratio of 60% is secured. If the thickness of the annular piece 10b is 0.6 mm,
The aperture ratio is as large as 76%.

Due to such a large aperture ratio, the pressure loss when passing through the polymer is greatly reduced. Usually, in a filter device, the life of the filter is judged by the increase of the filter pressure (the inlet pressure of the filter medium) due to the clogging of the filter medium, and the filter is replaced when the filter pressure reaches a certain upper limit. When the aperture ratio is increased and the pressure loss in the hub ring portion is significantly reduced, the initial filtration pressure is significantly reduced, and the usable time of the filter until the above certain upper limit is reached is increased accordingly (that is, the accumulated polymer is accumulated). The flow rate increases, and the filter life is greatly extended.

Further, the support piece 10a is composed of pressing plates 9a and 9b.
Since it extends perpendicularly to the above and receives the compressive load applied between the pressing plates 9a and 9b most efficiently, it exhibits an extremely high compressive strength. Therefore, first, structurally, it is possible to easily design with sufficient compressive strength even with a total tightening force of about 10 tons or more. Further, if the supporting member 10 is made of stainless steel as in the present embodiment, when the supporting member 10 is processed to form the supporting piece 10a as described above, work hardening peculiar to stainless steel occurs and the compressive strength is improved. It will be further improved.

Further, as described above, the opening ratio can be made extremely large, so that there is no portion where the polymer may stay in the entire polymer passage 15 of the hub ring 2. That is, the entire amount of the polymer can smoothly pass through the polymer passage 15 of the hub ring 2. Since no stagnation occurs, no deteriorated polymer is generated, and defects in product quality such as fish eyes due to outflow of deteriorated polymer are prevented, and production troubles occur in the subsequent process due to outflow of deteriorated polymer. To be prevented.

Further, the hub ring 2 according to the present invention is greatly simplified and facilitated in terms of manufacturing method as compared with the conventional structure. That is, the hub ring 2 according to the present invention is
The pressing plates 9a and 9b and the supporting member 10 can be processed as separate members, and the pressing plates 9a and 9b can be mass-produced extremely easily, and the supporting member 10 has the same structure as shown in FIG. , Simply cut 12 in the annular plate member
A machining put, since the cut between the portions 13 need only apply a 90 ° twist processing, the processing is extremely easy compared with the case where the conventional radial direction provided many small holes. Then, by combining these members, the predetermined hub ring 2 can be easily obtained. Therefore, the hub ring 2 can be mass-produced easily and in a short time by a simple processing step, and can be manufactured at low cost.

The pair of pressing plates 9a and 9b and the supporting member 1
At the time of combination (assembly) with 0, as shown in FIG. 7, these members may be joined in a predetermined positional relationship by spot welding or the like (welded portion 16). As a result, it becomes possible to handle the hub ring 2 as one integral part, and the handleability is further improved.

Further, in the above embodiment, the supporting member 1
Although the method of using the annular flat plate-shaped member 11 as the material has been described as the manufacturing method of 0, the manufacturing method is not limited to this method, and other methods can be used. For example, as shown in FIG. 8, a flat plate-shaped member 20 extending in a strip shape and a linear shape
Insert a large number of cuts 21 into the
The support piece is twisted to form a support piece, and then the entire member is bent into a circular shape as shown by an arrow, whereby a support member equivalent to that shown in FIG. 4 can be manufactured.

Further, in the above embodiment, the annular piece 10b is arranged on the outer diameter side of the hub ring of the support piece 10a arranged in an annular shape, but the annular piece may be located on the inner diameter side of the hub ring of the support piece. For example, as shown in FIG.
b is a support piece 17 that is twisted 90 degrees and arranged in an annular shape.
The support member 17 located on the inner diameter side of the hub ring of a may be used.

[0031]

As described above, in the case of the filter hub ring of the present invention, the polymer passage is formed by the supporting member having a large number of supporting pieces arranged between the pair of holding plates. The opening ratio of the polymer passage can be greatly increased, and the pressure loss due to the hub ring can be suppressed to an extremely low level.

Further, it is possible to easily give the hub ring a desired high compressive strength while having a simple structure.

Further, it is possible to realize a flow path shape in the hub ring which is free from polymer retention, prevent deterioration polymer from being generated due to retention, and improve product quality.

Further, the hub ring according to the present invention can be mass-produced extremely easily and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a partially transparent perspective view of a filter using a hub ring according to an embodiment of the present invention.

FIG. 2 is a front view of the hub ring of FIG.

3 is a partially enlarged perspective view of the filter shown in FIG.

FIG. 4 is a plan view of a supporting member of the hub ring of FIG.

5 is an enlarged partial perspective view of the support member of FIG.

FIG. 6 is a plan view of the support member of FIG. 4 during processing.

FIG. 7 is a partial perspective view of a hub ring according to a modified example of the present invention.

FIG. 8 is a plan view of a material showing a method of processing a supporting member different from that of FIG.

FIG. 9 is a plan view of a support member in which an annular piece is located on the hub ring inner diameter side of the support piece.

FIG. 10 is a partial perspective view of a conventional filter.

[Explanation of symbols]

1 filter 2 hub ring 3 retainer 4 Perforated plate 5 filter media 6 spacers 7 Molten polymer 8 props 9a, 9b Presser plate 10, 17 Support member 10a, 17a Support piece 10b, 17b annular piece 11 Flat member 12 breaks 13 Between breaks 14 Annular part 15 Polymer passage 16 welds 20 Flat member 21 breaks 22 Between breaks

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B01D 29/34

Claims (3)

(57) [Claims] 1. A hub ring provided on at least one of an inner circumference and an outer circumference of a disk-shaped filter, comprising: (a) a holding plate made of a pair of annular flat plate members that are arranged to face each other and are spaced apart from each other; b) A support piece formed of an annularly extending member interposed between the pair of holding plates and extending between the pair of holding plates in a direction substantially perpendicular to the pair of holding plates and at the same time extending in the hub ring radial direction. together are arranged with a distance from one another in a number hub ring circumferential direction, a support member having an annular piece said multiple of the support piece is connected, Ri Tona, the plurality of supporting pieces, as a material of the support member Flat plate
A number of cuts are engraved on the member at specified intervals, and the space between adjacent cuts is
Formed by twisting the parts 90 degrees in the same direction
The annular piece is a cut of the flat plate-shaped member.
A hub ring for a filter, which is characterized by being formed from a portion that is not engraved . 2. The hub ring for a filter according to claim 1, wherein the annular piece of the support member is connected to either the outer diameter side or the inner diameter side of the hub ring of the multiple arranged support pieces. 3. The support member is made of stainless steel,
The hub ring for a filter according to claim 1 or 2.