JPH0626323Y2 - Filter press filter cloth structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter cloth structure for a filter press, which comprises a pair of filter cloths having an undiluted solution hole substantially in the center of a filtering surface.

2. Description of the Related Art Conventionally, an undiluted solution hole is opened at approximately the center of each filter action surface of two filter cloths, the undiluted solution holes are aligned and a patch cloth is sewn onto the undiluted solution holes, and the undiluted solution holes are formed in a pair of filter cloths. A filter press filter cloth formed with is known. Further, two filter cloths each having a hole slightly smaller than the size of the communication hole (stock solution hole) opened in the center of the filter plate and covering both sides of the filter plate are placed in the communication hole of the filter plate, There is a filter cloth for a center feed type filter press (Japanese Utility Model Publication No. 50-129960) in which two joining plates are applied to the outer peripheral edge of a small hole and tightened with bolts to connect them.
Also, as a filter cloth fastener for a filter plate, it consists of a male body and a female body that are attached to the stock solution holes of the filter plate. The male body and the female body are attached and screwed together, the filter cloths on both sides are tightened by the jaws of both the male body and the female body, and the spanner hook is turned in the reverse direction to unscrew the screw cloth. 46-11195)
Is known. Also, a male type having a flange at one end of the cylindrical portion and a plurality of protrusion guides provided on the outer periphery in the vicinity of the other end, and a plurality of tapered pieces corresponding to the protrusion guides on the circumference of an annular body screwed into the cylindrical portion. Which is provided with a male type and a female type, and the original liquid hole portion of the filter cloth covering both sides of the filter plate is fastened to the original liquid hole portion of the filter plate with the male type and the female type (Shokai 56-106507).
Issue gazette). Also, a ring-shaped outer frame, a filtration mesh fitted along the inner circumference of the outer frame, a ring-shaped inner frame fixed around the hole opened in the center of the mesh, and a position where it covers both sides of the outer frame and hangs on the inner frame. A filter plate (Japanese Utility Model Publication No. 13-5611) is known, which is composed of a filter cloth having holes formed in the inner frame and eyelet fittings for sandwiching the edges of the filter cloth hanging on both sides of the inner frame from both sides.

Problems to be Solved by the Invention A pair of filter cloths in which the undiluted solution holes of two conventional filter cloths are connected to each other are used as a pair of filter cloths. The undiluted solution pores of one filter cloth may be pressed against the undiluted solution pores of the filter cloth on the side adjacent thereto due to the filtration pressure, and the undiluted solution pores may approach or come into close contact with each other. Therefore, the stock solution may enter the filtration chamber only slightly or may not be supplied at all. Even if the plate is opened next time, the stock solution is not dehydrated to a predetermined water content value, or the filtration chamber is opened in a completely empty state. Also, in the case where two filter cloths are fastened from both sides by joining plates in the undiluted solution hole of the filter plate, the joining plate enters the communication hole (undiluted solution hole) of the filter plate and the holes of the two filter cloths are Since they are connected, the connecting hole of the filter plate must be opened larger than the hole diameter of the filter plate which is usually required, more than the size of the joining plate. Further, when the filter plate is closed, the joint plate and the joint plate of the adjacent filter plate are separated from each other, so that the filter cloth hole portion to which the joint plate is applied may be displaced in the flowing direction of the stock solution. When the hole portion of the filter cloth shifts in the flow direction of the undiluted solution, the filter cloth on one side is forcibly stretched and broken, causing a wrinkle, and the resistance to passage of the undiluted solution increases. Next, since the filter cloth fastening tool consisting of the male type and the female type having the spanner hooking portion on the surface thereof, the spanner hooking portions of the adjacent filter plates are brought into close contact with each other when the filter plates are tightened, Even if the jaws 3 and 8 of the filter cloth clamp are on the filter cloth, the jaws rather serve to limit the flow of the stock solution. For this reason, the thickness of the jaw should be increased and the groove 5 for passing undiluted solution should be used.
If the depth is increased, the solid content in the stock solution will easily clog the groove. Further, if the filter plate has neither a filter bed nor a stock solution hole, this filter cloth fastening tool cannot be used. Next, a male type with a flange at one end of the cylinder and an annular body that fits into the other end of the cylinder that locks the undiluted solution hole of the filter cloth to the undiluted solution hole of the filter plate is the flange and the annular body of adjacent filter plates. Since they come close to each other when the filter plate is tightened, even if the flange portion and the ring-shaped body of the filter cloth fastening tool are on the filter cloth, the flange portion and the ring-shaped body rather serve to restrict the flow of the stock solution. Further, this filter cloth fastening tool cannot be used for a filter plate having neither a filter bed nor a stock solution hole.
Next, in the case where the inner frame is fixed to the center of the mesh stretched in the outer frame and the undiluted solution holes of the filter cloth are fastened with eyelet fittings on both sides of the inner frame, the eyelet fittings of the adjacent filter plates are fastened with the filter plate. Since they are also separated from each other, even if the hole periphery of the filter cloth 10 is tightened with the flange portion of the eyelet fitting, the flange portion does not function to introduce the stock solution into the filtration chamber. Further, even if the eyelet fitting is attached to the filter cloth, there arises a problem in sealing between the eyelet fitting and the annular inner frame 7 and a problem that the positioning of the eyelet fitting and the annular inner frame becomes difficult.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems of the prior art, in which a filter plate is a hollow frame, and a plurality of the filter plates are arranged side by side and a pair of filter cloths are applied to each filter plate for filtration. It is intended to improve the smooth pressing process.

Means for Solving the Problems In the present invention, two filter cloths 5 and 5 ', each of which has a through hole for forming an undiluted solution hole in the center of a filtering surface, are sewn together at the peripheral portions of both through holes. By connecting them, the undiluted solution holes 3 of the pair of filter cloths 2 are formed, and the pair of filter cloths 2 are hung on each filter plate 10 composed of a hollow frame without a filter bed to close the filter plate plate 10. A filter chamber is formed between the filter action surfaces of a pair of adjacent filter cloths, and the stock solution supplied from the supply side at one end of the filter press is sequentially introduced into the filter chamber from the stock solution hole 3 to perform each filter action. A pair of filter cloths 2 to be filtered on the surface
A filter press filter cloth comprising
A plurality of edge bars 1 are attached to the peripheral edges of the filter cloths 5, 5'on both sides of the filter cloth 5 and 5 ', respectively. The filter cloth structure of the filter press has a size in which the height of the edge bar 1 is matched with the thickness of the filter plate 10 on which the filter cloths 5 and 5'are hung.

The effect of the filter cloth of the filter press of the present invention is carried out by filtering and squeezing each filter plate composed of a frame body without filter beds, which is constructed as described above. The stock solution enters the filtration chamber from the peripheral portion between the edge bars 1 attached to the edges of the stock solution holes. Even if the filtration action surface of the filter cloth receives the liquid pressure of the supplied undiluted solution and tries to move to one side during filtration, the undiluted solution holes of each filter cloth are held at a constant interval in the space inside the frame of the filter plate. To be done. Therefore, the thickness of each filtration chamber can be made equal, and the stock solution can be uniformly introduced into the filtration chamber. Further, it is possible to obtain a cake having the same thickness and the same moisture content. Further, no wrinkles are generated from the undiluted solution hole portions of the pair of filter cloths. Further, since the undiluted solution stably passes through the periphery of the undiluted solution hole of the filter cloth, the cake does not adhere to the periphery of the undiluted solution hole and solidify.

Embodiments The present invention will be described with reference to the drawings. In FIGS. 1, 2, and 3, reference numeral 1 is an edge bar attached to the periphery of the stock solution holes 3 of the pair of filter cloths 2 of the filter press. The undiluted solution hole 3 is formed by abutting a through hole opened substantially at the center of the filtering surface of the filter cloths 5, 5'on both sides constituting the pair of filter cloths 2, but abutting cloth is applied to the inside thereof, and is bent and sewn. There is. The edge bar 1 is a set of two edge bars 6
Then, these are arranged in parallel on both sides of the periphery of the stock solution hole 3 and fastened with screws 4. When the height of the edge bar 1 projected on the filter cloth 5 on the one side and the height of the edge bar 1 projected on the filter cloth 5'on the other side are combined, a filter plate on which both filter cloths 5 and 5'are hung. This corresponds to a thickness of 10 (Figs. 2 and 3).

The edge bar 1 is in contact with the filter cloth of the adjacent filter plate during filtration so that a constant space is provided between the undiluted solution holes of both filter cloths. The thickness of the filtration chambers is equalized. The stock solution enters the filtration chamber on average. After filtration, a cake with the same thickness and moisture content is obtained. The filter cloth is
Wrinkles do not occur on the filtration surface from the stock solution holes. In addition, no cake remains on the periphery of the stock solution hole.

4 and 5 and 6 show an example in which the edge bar 1 is assembled in a frame shape. In the same figure, each end of a pair of two bar-shaped edge plates 7 is connected by a thin connecting piece 8. A mounting hole for mounting the frame die is provided in the middle of the connecting piece 8.

In the above embodiment, the edge bars 1, 6 and 7 are molded products made of metal, rubber or synthetic resin. The shape of the edge bar 1 is not limited to that shown in the figure. When using the edge rod 1, an appropriate one is selected from the above-mentioned ones in accordance with the filter cloth to be used. Also, in order not to damage the filter cloth material, the front and back surfaces and the corners of the edge rod 1 are largely rounded. Further, as the means for attaching the edge rod 1 to the filter cloth, an adhesive material or an adhesive tape other than the screw 4 or screw can be used.

The pair of filter cloths 2 of the present invention constructed as described above are hung on each filter plate 10 composed of a hollow frame body without a filter bed in which a large number of sheets are arranged, and the tightening stock solution is supplied by a tightening device as usual. After filtering, after filtering, the filter plates 10 are opened one by one or at the same time by opening the frame simultaneously, and both filter cloths 5, 5 between the adjacent filter plates 10 are opened.
The cake formed on the filtration surface 5'is discharged. The filtered liquid flows between the filter plates 5 and 5'located on both sides of the filter plate 10 and is discharged from the inside of the frame of the filter plate 10 to the outside. It is also possible to apply a flexible squeeze film to every other filter plate out of the above-mentioned many arranged filter plates 10 and arrange the squeeze film as a squeezing type filter plate for filtering and squeezing.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a front view of a pair of filter plates, FIG. 2 is a sectional view taken along line YY of FIG. 1, and FIG. 3 is FIG. 1X.
-X sectional view, FIG. 4 shows another embodiment in the undiluted solution hole portion of the pair of filter cloths shown in FIG. 1, and FIG. 5 and FIG. 6 are the central longitudinal sectional view and the central view of FIG. 4, respectively. It is a horizontal sectional view. 1 ... Edge bar, 2 ... Pair of filter cloths, 3 ... Undiluted solution hole, 4 ...
Screws, 5, 5 '... filter cloths on both sides constituting a pair of filter cloths,
6 ... a set of edge bars, 7 ... bar-shaped edge plates, 8 ... connecting pieces, 1
0 ... filter plate.

Claims (1)

[Scope of utility model registration request] 1. A pair of filters by sewn together two filter cloths 5 and 5'each having a through hole for forming an undiluted solution hole at the substantially center of the filtering surface and connecting them together at their peripheral portions. The undiluted solution holes 3 of the cloth 2 are formed, and the pair of filter cloths 2 are hung on each filter plate 10 composed of a hollow frame without a filter bed, and when the filter plates 10 are closed, a pair of adjacent filter cloths A filtration chamber is formed between the filtration chamber and the filtration surface, and the undiluted solution supplied from the supply side at one end of the filter press is sequentially introduced into the filtration chamber through the undiluted solution hole 3 and is filtered by each filtration surface. Cloth 2
In the filter cloth of the filter press, the plurality of edge bars 1 are attached to the edges of the filter cloth 5, 5'on both sides of the stock solution hole 3 so as to be separated from each other. A filter in which the combined size of the height of the rod 1 and the height of the edge rod 1 on the filter cloth 5'on the other side corresponds to the thickness of the filter plate 10 on which the filter cloths 5 and 5'are hung. Filter cloth structure of the press.