JP2002045730A - Filter cloth attachment structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter cloth attachment structure which is used e.g. for a basket-type centrifugal separator for subjecting a suspension comprising solid particles and a liquid to solid-liquid separation, prevents fine particles from leaking through a filter cloth, and decreases the labor and time required for attaching a filter cloth. SOLUTION: This structure is composed of a basket 2, peripheral grooves 3, a filter cloth 4, and seal members 5. Especially, the structure includes annular peripheral groove 3 which are formed at the outer peripheral sections of terminal walls 8 of a basket 2 and continue to the inner peripheries of a surrounding wall 7, an open-end tubular filter cloth 4 which is soft and is positioned at the inside the surrounding wall 7 of the basket 2 and of which both the terminal edges 9 are inserted into respective peripheral grooves 3, and annular sealing members 5 which are inlaid into the peripheral grooves 3 to seal the gaps between terminal edges 9 of the filter cloth 4 and the basket 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a filter cloth mounting structure used for a basket type centrifuge for solid-liquid separation of, for example, a suspension which is a mixture of solid particles and a liquid.

[0002]

2. Description of the Related Art Conventionally, as this type of filter cloth mounting structure,
For example, those shown in FIG. 5 and those shown in FIGS. 1 to 4 of JP-A-10-180144 are known. The former includes a basket having a peripheral wall provided with a large number of through holes and end walls integrally provided on both sides of the peripheral wall, and an annular peripheral groove formed at both inner ends of the peripheral wall of the basket. The end of the band-shaped one is formed into a cylindrical shape so that the ends thereof are superimposed, and the end-end cylindrical filter cloth is positioned inside the peripheral wall of the basket. And a rope for fixing. The latter has a basket having a peripheral wall provided with a large number of through holes and end walls provided integrally on both sides of the peripheral wall, and a belt-like one formed into a tubular shape so that the beginning and the end thereof are overlapped. An end-end cylindrical filter cloth positioned inside the peripheral wall of the basket, and an annular filter cloth fixing bracket movable only in the radially expanding direction so as to press both end edges of the filter cloth against the peripheral wall of the basket. ing.

[0003]

However, in the case of the former, since both ends of the filter cloth must be bent and fixed in the circumferential groove, this kind of work is complicated, and both ends of the filter cloth must be fixed. It was easy to be damaged. On the other hand, in the case of the latter, since both ends of the filter cloth had to be fixed with special filter cloth fixing brackets, this kind of work was complicated. Also, any of them
Since it had to be held in a cylindrical shape in a basket using a band-shaped filter cloth, a large number of hands were required, and since the starting and ending ends were simply polymerized, the fine particles from here were removed. There was a risk of leakage.

As a filter using a filter (metal screen) made of a perforated plate, a wire mesh, or the like instead of a filter cloth, a filter described in FIG. 7 of Utility Model Registration No. 2534444 is known. This is a basket having a peripheral wall provided with a large number of through-holes and end walls provided on both sides thereof, one of which is detachable, and a peripheral wall formed on an outer peripheral portion of each end wall of the basket. An annular circumferential groove continuous to the inner circumference and an endless tubular shape formed by welding a strip-shaped one with a tubular end or a overlapping portion so that the end and the beginning are overlapped are formed into an endless tubular shape, and both end edges are formed at each periphery. A filter made of a self-supporting material such as a perforated plate or a wire mesh inserted into the groove, and an annular sealing material inserted into each circumferential groove to seal between each end wall and both end edges of the filter. I have.

However, since such a filter uses a filter made of a self-supporting material such as a perforated plate or a wire mesh, it cannot be inserted into the basket unless one end wall of the basket is detached. Was. For this reason, since the basket must be disassembled and assembled, the work of mounting the filter becomes large and there is a problem that the structure of the basket becomes complicated. Needless to say, since the filter is manufactured by using a perforated plate, a wire mesh, a laminate thereof, or the like, its filter hole becomes larger than that of the filter cloth, and it is difficult to apply the filter to solid-liquid separation of a fine particle suspension. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in order to solve the problem. The object of the present invention is to prevent leakage of fine particles from the filter cloth and to prevent the filter cloth from leaking. An object of the present invention is to provide a filter cloth mounting structure capable of reducing labor and time required for mounting.

[0007]

SUMMARY OF THE INVENTION A filter cloth mounting structure according to the present invention comprises a basket having a peripheral wall having a large number of through holes and end walls integrally provided on both sides of the peripheral wall. An annular peripheral groove formed on the outer peripheral portion of the end wall and continuing to the inner periphery of the peripheral wall, and an endless cylindrical shape having flexibility and located inside the peripheral wall of the basket and having both edges inserted into each peripheral groove And a ring-shaped sealing material fitted into each circumferential groove to seal between both ends of the filter cloth and the basket.

[0008] The filter cloth is rolled into a shape having an outer diameter smaller than the opening of one end wall of the basket, and inserted into the basket from the opening. Then, the filter cloth is cylindrically expanded along the inner peripheral surface of the peripheral wall of the basket, and both edges are bent by utilizing its flexibility to be inserted into each peripheral groove of the basket. Thereafter, a sealing material is fitted into each of the circumferential grooves to seal between both ends of the filter cloth and the basket. The filter cloth has an endless cylindrical shape, and both ends are inserted into the circumferential groove and sealed by the seal material, so that leakage of fine particles from the filter cloth is prevented. The filter cloth can be mounted at a predetermined position inside the basket from the opening thereof by utilizing its flexibility, so that the labor and time required for mounting can be reduced.

[0009] The filter cloth is formed into a tubular shape so that the end and the beginning of the filter cloth are overlapped, and a step portion is formed and sewn so that the overlapped portion has a uniform thickness with other portions. Is preferred. With this configuration, the band-shaped material can be formed into an endless cylindrical shape having a uniform thickness, the sealing effect by the sealing material can be exerted uniformly over the entire circumference, and partial leakage of fine particles can be prevented. Can do things.

[0010] The filter cloth is formed into a tubular shape so that the end and the beginning of the filter cloth are superimposed, and a step portion is formed so that the superposed portion has a uniform thickness with other portions, and is adhered by an adhesive. It is preferred that they are stitched together. In this manner, the polymerized portion of the filter cloth is bonded not only by stitching but also by an adhesive, so that the bonding strength is increased accordingly.

It is preferable that a wire mesh attached to the peripheral wall of the basket be interposed between a portion of the filter cloth other than both end edges and the peripheral wall of the basket. With this configuration, the peripheral wall of the basket except for the through-hole does not directly contact the filter cloth, so that the filtering effect of the filter cloth is improved accordingly.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a part of a basket-type centrifugal separator suitable for applying the filter cloth mounting structure of the present invention, in a longitudinal section. FIG. 2 is a longitudinal sectional front view showing a part of the basket of FIG. 1 in an enlarged manner. FIG. 3 is a perspective view showing a filter cloth.
4 is an enlarged view of a portion A in FIG. 3, (a) is a schematic plan view before suturing, and (b) is a plan view after suturing. (C) is a front view of a main part of (b).

The filter cloth mounting structure 1 has a basket 2, a circumferential groove 3, a filter cloth 4, and a sealing material 5 as its main part, and is applied to a vertical basket type centrifugal separator 50.

The basket type centrifugal separator 50 comprises a bed 5
1, an elastic support device 52 provided thereon, a casing 53 supported thereon, a basket 2 provided rotatably about a vertical axis, and a rotary drive provided on the casing 53 to rotate the basket 2 A device 54 and a scraping device 55 provided in the casing 53 for scraping off the cake attached to the basket 2 are provided.

The basket 2 has a peripheral wall 7 formed with a large number of through holes 6 and end walls 8 provided integrally on both sides thereof. In this example, a cylindrical peripheral wall 7 is provided. It comprises upper and lower end walls (top wall and bottom wall) 8 which are integrally welded to the upper and lower sides thereof, and a large number of through holes 6 which are formed in a staggered manner in the peripheral wall 7. The inner and outer peripheral surfaces are not cut.

The circumferential groove 3 is formed in an outer peripheral portion of each end wall 8 of the basket 2 and is continuous with the inner periphery of the peripheral wall 7 in an annular shape.
In this example, the bottom wall 8 has a concave shape,
Are respectively depressed in the outer peripheral portion of the upper surface and extend vertically along the inner periphery of the peripheral wall 7.

The filter cloth 4 is an endless cylindrical member having flexibility and located inside the peripheral wall 7 of the basket 2 and having both edges (both ends in the width direction) 9 inserted into the respective peripheral grooves 3. In this example,
It is made of Tetron (registered trademark) felt, and the strip is formed into a tubular shape so that the ends (both ends in the circumferential direction) of the strip overlap, and the overlapped portion 11 has a uniform thickness with other portions. Are formed and sewn. Filter cloth 4
Is composed of a central base cloth 13 and webs 14 laminated on the front and back sides thereof. The overlapping webs 14 of the overlapping portion 11 are cut off to form the stepped portions 12. Specifically, the circumference (endless length) is 3798 mm and the height is 8
20 mm, thickness 1.5 mm, overlap of overlapping part 11 is 3
0 mm, the center of the overlapped portion 11 is sewn by the single stitch 15 and both sides of the overlapped portion 11 (web 1
Two butted ends are stitched together by overlock stitching (staggered overlock stitching) 16.

The seal member 5 is an annular member which is fitted into each of the circumferential grooves 3 to seal between the end edges 9 of the filter cloth 4 and the basket 2. In this example, the seal member 5 is made of a silicone rubber o-ring. The filter cloth 4 is fitted into the peripheral groove 3 so that both end edges 9 of the filter cloth 4 abut against the peripheral wall 7 of the basket 2.

Next, the operation will be described based on such a configuration. The filter cloth 4 is rounded into a shape having an outer diameter smaller than an opening (not shown) in the upper end wall 8 of the basket 2 and inserted into the basket 2 from the opening. And
The filter cloth 4 is cylindrically expanded along the inner peripheral surface of the peripheral wall 7 of the basket 2, and is inserted into the upper and lower peripheral grooves 3 by bending the upper and lower edges 9 by utilizing flexibility. . Then, the filter cloth 4 is joined to the inner peripheral surface of the peripheral wall 7 of the basket 2 to be self-standing. Thereafter, the sealing material 5 is fitted into the upper and lower peripheral grooves 3, respectively, and the space between the upper and lower edges 9 of the filter cloth 4 and the basket 2 is sealed.

The filter cloth 4 has an endless cylindrical shape, and the upper and lower ends 9 are inserted into the respective circumferential grooves 3 and sealed by the sealing material 5, so that the overlapping portion 11 of the filter cloth 4 and the upper and lower ends are formed. Rim 9
Leakage of fine particles from the surface can be completely eliminated. Filter cloth 4
Can be attached to a predetermined position inside from the opening of the basket 2 by utilizing its flexibility, and can be made to stand alone in a cylindrical shape. And time can be reduced. In particular, since this is unnecessary as compared with the structure in which the upper end wall 8 of the basket 2 is separated, the structure can be simplified and the cost can be reduced accordingly.

Since the sealing material 5 is fitted into the circumferential groove 3 and does not protrude, the scraping blade of the scraping device 55 avoids this in comparison with the case where the filter cloth is fixed with the filter cloth fixing bracket. The notch is not required, and the cake can be discharged effectively. After the upper and lower edges 9 are inserted into the circumferential groove 3, the filter cloth 4 is sealed by the sealing material 5 in a straight state without being bent, so that damage to the upper and lower edges 9 is prevented. .

Next, a second embodiment of the present invention will be described with reference to FIG. In the second example, the whole of the polymerized portion 11 of the filter cloth 4 is adhered with an adhesive (such as Loctite 424) 17 and a predetermined length (30 mm) from both upper and lower ends of the polymerized portion 11.
The second embodiment is different from the first embodiment in that overlock stitches 16 are used and sewing is performed using synthetic resin (urethane VH-6 or the like) 18, and the other portions are the same. In such a structure, the upper and lower portions of the overlapped portion 11 are adhered by the adhesive 17 and are not sewn, so that the thickness is made uniform and the sealing effect by the sealing material 5 is evenly performed. Are sealed by the synthetic resin 18, so that fine particles do not leak from the seam.

Next, a third embodiment of the present invention will be described with reference to FIG. The third example is different from the first example in that a wire mesh 19 is interposed between a portion excluding the upper and lower edges 9 of the filter cloth 4 and the peripheral wall 7 of the basket 2, and the other is the same. Wire mesh 19
Is rolled to a predetermined thickness (about 1.5 mm) and is attached by spot welding to a position other than the upper and lower portions of the peripheral wall 7 of the basket 2. In such a case, since the wire mesh 19 is present, the peripheral wall 7 except for the through holes 6 of the basket 2 does not directly contact the filter cloth 4, and is filtered by the entire filter cloth 4, and the filtering effect is improved accordingly. You.

In the above example, the filter cloth mounting structure 1 is applied to a vertical basket type centrifuge, but is not limited to this, and may be applied to, for example, a horizontal basket type centrifuge. In the above example, the filter cloth 4 is formed in an endless cylindrical shape from a belt shape. However, the present invention is not limited to this. For example, the filter cloth 4 may be woven or knitted in a cylindrical shape from the beginning.

[0025]

As described above, according to the present invention, as described above,
The following excellent effects can be obtained. (1) It is composed of a basket, a circumferential groove, a filter cloth, and a sealing material, and has, in particular, an annular circumferential groove formed on the outer peripheral portion of each end wall of the basket and continuous with the inner periphery of the peripheral wall, and has flexibility. An endless cylindrical filter cloth which is located inside the peripheral wall of the basket and has both edges inserted into each peripheral groove, and an annular seal which is fitted into each peripheral groove and seals between the both edges of the filter cloth and the basket. Since the material is provided, leakage of fine particles from the filter cloth can be prevented, and the labor and time required for mounting the filter cloth can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a part of a basket type centrifugal separator suitable for applying a filter cloth mounting structure of the present invention, which is cut longitudinally.

FIG. 2 is a longitudinal sectional front view showing a part of the basket of FIG. 1 in an enlarged manner.

FIG. 3 is a perspective view showing a filter cloth.

FIG. 4 is an enlarged view of a portion A in FIG. 3, (a) is a schematic plan view before suturing, and (b) is a plan view after suturing. (C) is a front view of the main part of (b).

FIG. 5 is a view similar to FIG. 4, showing a second example of the present invention.

FIG. 6 is a view similar to FIG. 2, showing a third example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Filter cloth installation structure, 2 ... Basket, 3 ... Peripheral groove, 4 ... Filter cloth, 5 ... Sealing material, 6 ... Through-hole, 7 ... Peripheral wall, 8 ... End wall, 9
... edge, 10 ... start and end, 11 ... overlap, 12 ... step
13 ... base cloth, 14 ... web, 15 ... single stitch, 16 ...
Overlock sewing, 17 ... adhesive, 18 ... synthetic resin, 19 ... wire mesh, 50 ... basket type centrifuge, 51 ... bed, 5
2 ... elastic support device, 53 ... casing, 54 ... rotary drive device, 55 ... scraping device.

Claims (4)

[Claims] 1. A basket having a peripheral wall provided with a large number of through holes and end walls integrally provided on both sides of the peripheral wall.
An annular peripheral groove formed on the outer peripheral portion of each end wall of the basket and continuous with the inner periphery of the peripheral wall; and a flexible and located inside the peripheral wall of the basket and both end edges inserted into each peripheral groove. A filter cloth mounting structure, comprising: an endless cylindrical filter cloth; and an annular sealing material fitted into each circumferential groove to seal between both ends of the filter cloth and the basket. 2. A filter cloth is formed into a tubular shape so that its end and beginning are superimposed, and a step portion is formed and stitched so that the superimposed portion has a uniform thickness with other portions. The filter cloth mounting structure according to claim 1. 3. The filter cloth is formed in a tubular shape so that the end and the beginning of the filter cloth are superimposed, and a step portion is formed so that a superposed portion has a uniform thickness with other portions. 2. The filter cloth mounting structure according to claim 1, wherein the filter cloth is attached and sewn. 4. A filter cloth installation according to claim 1, wherein a wire mesh attached to the peripheral wall of the basket is interposed between a portion of the filter cloth other than both end edges and the peripheral wall of the basket. Construction.