JP2752573B2 - Pressed filter plate in filter press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressed filter plate in a filter press, and more particularly, to a pressed filter plate for preventing deformation of a filtrate hole portion of a pressed membrane of the pressed filter plate.

[0002]

2. Description of the Related Art In general, a press filter plate of a filter press provided with a press membrane has a drawback that a filtrate hole portion of the press membrane is easily deformed by the press pressure and is easily broken. For example,
In Japanese Patent No. 30543, the hole of the sheet, which is a compressed film, is easily damaged, so that the edge member 12 is fitted and protected.

[0003]

However, in the above-mentioned structure, when the squeezing pressure is high, the hole may be deformed and damaged together with the rim member. Therefore, the hole cannot be sufficiently protected by the rim member. Accordingly, an object of the present invention is to solve the above-described problems, and in a filter press in which a passage for discharging a filtrate can be sufficiently secured, and the passage is not deformed even by a pressing pressure. It is to provide a press filter plate.

[0004]

In order to achieve the above object, the present invention provides a method in which a pressing film is covered on a substrate without forming a hole portion penetrating the pressing film, and the periphery of the pressing film is pressed by a pressing frame. A filtrate discharge passage is formed in the holding frame to discharge the filtrate. That is, the invention of claim 1 provides a substrate having a filtrate hole which communicates with a filtration bed portion and discharges a filtrate of the filtration bed portion, a compression membrane disposed on the filtration bed portion of the substrate, Having a filtrate discharge passage for communicating the surface of the filtration bed portion with the filtrate hole of the substrate, and
And a pressing frame attached to the substrate for pressing and holding a peripheral portion of the compressed film. According to a second aspect of the present invention, in the first aspect of the present invention, a concave portion is formed in the filter bed portion of the substrate, the compressed film is housed in the concave portion, and the pressing frame is fitted in the concave portion. It can also be configured to be combined. According to a third aspect of the present invention, in the first or second aspect, the pressing frame is formed at a portion of the filtrate discharge passage that communicates with a surface of the filtration bed portion of the compression membrane, and the filtrate discharge passage is connected to the filtrate discharge passage. It may be configured to have a cut groove communicating therewith. According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the substrate has a filtrate discharge hole formed so as to penetrate in a thickness direction. It is also possible to configure so as to communicate with the filtrate discharge hole.

[0005]

According to the structure of the present invention, since the holes for discharging the filtrate are not formed in the pressed film of the pressed filter plate, the holes are not deformed and the holes of the pressed film are formed. Since there is no hole in the substrate for communicating with the portion, there is no possibility that the hole in the substrate is blocked by the compressed film. Further, the expiration date of the compressed membrane is not shortened due to the breakage of the hole. Further, unlike the case where a hole is formed in the compression membrane, since the filtrate discharge passage is formed in the holding frame, the filtrate discharge passage is not affected by the compression pressure at all, and can be a passage that is not easily deformed by the compression pressure. Also, if the cut groove is formed in the filtrate discharge passage portion of the holding frame, even if the opening portion of the filtrate discharge passage is blocked by the compressed film, there is a cut groove, and as a result, the filtrate is formed by the compressed film. The discharge passage is not blocked.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
It will be described in detail based on. The press filter plate in the filter press according to the present embodiment is configured as a center feed type press filter plate, as shown in FIG.
The compressed film 4 is laid in the concave portion 3 provided in the center of the substrate 2,
The pressing frame 5 is fitted to the substrate 2 at a position corresponding to the periphery of the pressing film 4 and the pressing film 4 is pressed.
The filter cloth 6 is disposed on both front and rear surfaces of the pressed filter plate.

The substrate 2 is shown in FIGS. 2A and 3A.
As shown in FIG. 3, concave portions 3 are provided at the center of the front and rear surfaces of a substantially rectangular plate made of, for example, polypropylene, and a concave portion 3 is formed. Ears 2a, ..., 2a
Is provided integrally. In FIG. 2 (A), filtrate discharge holes 15, 15, 15 are formed in the upper right, lower right, lower left ear portions 2a, 2a, 2a as through holes penetrating in the front-rear direction. A compressed fluid supply hole 16 penetrating in the front-rear direction is formed in the upper left ear 2a. Each of the filtrate discharge holes 15 and the inner surface opening of the concave portion 3 are connected to each other by the filtrate holes 7. The compressed fluid supply hole 16 is opened and communicates with the bottom surfaces of the front and rear recesses 3 by a supply passage 17 formed therethrough. The concave portion 3 has such a size that the compressed film 4 can be laid on the entire surface thereof.
In FIG. 1, reference numeral 29 denotes a packing member for the ear 2a.

The presser frame 5 is shown in FIGS. 2B and 3
As shown in FIG. 2B, a rectangular frame-shaped member made of a thin and less distorted material, for example, polypropylene, etc.
Of the surrounding area. The holding frame 5 is fastened to the substrate 2 with bolts and nuts or the like so that the compressed film 4 does not separate from the substrate 2 when the filter plate 1 is opened. In the holding frame 5, a filtrate discharge passage 27 communicating with the filtrate hole 7 on the upper right of the substrate 2 is formed in the upper right portion, and the filtrate discharge passage 27 is formed in the recess 3 as shown in FIG. Opening to the inner side, the filtration bed portion 9 of the compression membrane 4
The filtrate in the recess 3 is guided to the filtrate discharge hole 15 through the filtrate discharge passage 27 and the filtrate hole 7 at the upper right of the substrate 2 to improve the drainage of the filtrate. FIG.
As shown in (B), the lower right and lower left filtrate holes 7,
7 is formed continuously with the lower surface of the concave portion 3 of the holding frame 5 so that a part of the upper side of the filtrate discharge passage 27 is opened, and the surface of the filtration bed portion 9 of the compression membrane 4 is opened. Then, the filtrate in the concave portion 3 is discharged to the lower right and lower left filtrate discharge holes 15 of the substrate 2 through the filtrate discharge passage 27 and the filtrate holes 7 of the substrate 2, respectively. Improving sex. Also, as shown in FIG.
A notch groove 18 is formed along the inner circumference and the outer circumference. The cut grooves 18 are for preventing the filtrate discharge passages 27, 27 from being blocked by the compressed film 4 when the compressed film 4 swells. The filtrate also flows from the cut grooves 18 through the filtrate discharge passages 27, 27, through the filtrate holes 7, 7 in the substrate 2.
It flows into 7,7. The filtrate hole 7 and the filtrate discharge passage 27 constitute a communication hole 8 for communicating the filtration bed portion with the filtrate discharge hole 15.

As shown in FIGS. 4 (A) and 4 (B), the compression membrane 4 is formed of a substantially rectangular elastic membrane, and can be communicated with the stock solution hole 11 of the substrate 2 at substantially the center of the filtration bed portion 9. An undiluted solution hole 12 is formed. The stock solution hole 12 further communicates with the stock solution hole 13 of the filter cloth 6. Although not shown, it is preferable that a large number of concave and convex grooves for discharging the filtrate are formed in the filtration bed portion 9 like a known compression membrane.

[0010] A plurality of squeezing filter plates according to the above configuration are arranged between the front and rear stands, and a pair of filter cloths 6, 6 are sandwiched between adjacent squeezing filter plates to constitute a squeezing filter press. At the time of filtration, the pressed filter plate is fastened to, for example, the front stand side, and the undiluted solution to be filtered is supplied to the filtration chamber 14 formed between the filter cloths between the adjacent pressed filter plates to perform filtration. This state is shown in FIG. At the time of compression filtration, the filtration chamber 14
The undiluted solution is squeezed and filtered by the expansion of the squeezed membranes 4 and 4 of both squeezed filter plates. In FIG. 5, the upper pressing membrane 4 of the upper pressing filter plate 1 shows a state during filtration, and the lower pressing membrane 4 of the upper pressing filter plate and the upper and lower pressing of the lower pressing filter plate. The membranes 4 and 4 show a press-filtration state. During filtration or squeezing, the filtrate is discharged out of the machine through the filtrate hole 7, the cut groove 18, the filtrate discharge passage 27 and the filtrate discharge hole 15. In the above-mentioned compression filtration state, the compression membrane 4 is less likely to block the filtrate discharge passage 27 of the holding frame 5, and even if the opening of the filtrate discharge passage 27 is blocked by the compression membrane 4, the cut groove 18 is not formed. As a result, the filtrate discharge passage 27 is not blocked by the compression membrane 4 as a result. In the above embodiment, the substrate 2 and the holding frame 5
The filtrate hole 7, the filtrate discharge passage 27 and the cut groove 18 are for discharging the filtrate. However, in addition to discharging the filtrate, other fluids can be discharged or supplied. For example, supplying or discharging compressed air to remove moisture,
Also, the cake can be washed by supplying and discharging washing water. Further, a filtrate may be used instead of the washing water.

According to the above embodiment, since the hole for discharging the filtrate is not formed in the pressed film 4 of the pressed filter plate 1, the hole is not deformed. Since there is no hole in the substrate 2 for communicating with the portion, there is no possibility that the hole in the substrate 2 is blocked by the compressed film 4. Further, the expiration date of the compressed film 4 is not shortened due to the breakage of the hole. In addition, unlike the case where a hole is formed in the compressed film 4, the filtrate discharge passage 27 is formed in the holding frame 5, so that the filtrate discharge passage 27 is not affected by the compression pressure at all, and has a hole that is not easily deformed by the compression pressure. Can be. Further, since the cut groove 18 is formed in the filtrate discharge passage 27 of the holding frame 5, even if the opening of the filtrate discharge passage 27 is blocked by the compressed film 4, there is the cut groove 18. The filtrate discharge passage 27 does not block. Note that the present invention is not limited to the above-described embodiment, and can be implemented in various other modes. For example, the filtrate discharge passage 27 is not limited to the one formed as a hole penetrating the presser frame 5, but may be formed of a concave groove whose side surface along the axial direction is open.

Further, the cut groove 18 of the holding frame 5 is not limited to the above embodiment. As shown in FIGS. 6 and 7, the cut groove 18 has a rectangular concave portion and a convex portion alternately. You may make it form the tooth shape arrange | positioned. Therefore, the filtrate in the concave portion 3 of the substrate 2 flows from the cut groove 18 to the filtrate discharge passages 27, 27, 27, the filtrate hole 7 of the substrate 2,
The filtrate is led to the filtrate discharge holes 15, 15, 15 through 7, 7. In the figure, reference numeral 19 denotes a tightening bolt / nut for attaching the holding frame 5 to the substrate 2 via the compression film 4 to prevent the holding frame 5 from coming off the concave portion 3 of the substrate 2. For example, it is sufficient that one or two bolts / nuts 19 are provided vertically. Pressing membrane 4 when filter plate 1 is opened
Is to be tightened so as not to separate from the substrate 2. Alternatively, the holding frame 5 may be formed of an elastic material so that the holding frame 5 can be easily fitted into the recess 3 of the substrate 2 and airtightly attached. Also, the filtrate discharge passage 2 of the presser frame 5
, 27 may be provided not only on the lower or upper side of the presser frame 5 but also on the side. Further, the press filter plate 1 is not limited to the center feed type according to the above embodiment, but may be a bottom feed type or a top feed type. Also,
The hollow part 3 of the substrate 2 can be hollowed out by punching out the middle. Further, the substrate 2 is not limited to one having ears 2a,..., 2a projecting laterally from the side part. May be formed. In a so-called open-type filter press, the outer end of the filtrate hole 7 of the substrate 2 may be simply opened on the side surface of the substrate 2, and the filtrate may be discharged so as to flow directly out of the machine from the opening.

[Brief description of the drawings]

FIG. 1 is a front view of a squeezed filter plate in a filter press according to one embodiment of the present invention.

FIGS. 2A and 2B are a front view of a substrate and a front view of a holding frame of the compression filter plate, respectively.

3 (A) and 3 (B) are a cross-sectional view taken along line AA in FIG. 2 (A) and a cross-sectional view taken along line BB in FIG. 2 (B) of the pressing filter plate substrate, respectively, in FIG. 2 (A). .

FIGS. 4A and 4B are a front view and a cross-sectional side view of a pressed membrane of the pressed filter plate, respectively.

FIG. 5 is a partially cutaway sectional view of the compressed filter plate in a tightened state.

FIG. 6 is a front view of the holding frame.

7 is a cross-sectional view of the holding frame taken along line CC in FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Squeezed filter plate, 2 ... Substrate, 2a ... Ear part, 3 ... Depressed part of substrate, 4 ... Pressed film, 5 ... Holding frame, 6 ... Filter cloth, 7 ... Filtration hole of substrate, 8 ... Communication hole, 9 ... Filtration bed of pressed membrane, 10: undiluted hole of squeezed filter plate, 11: undiluted hole of substrate, 12: undiluted hole of pressed membrane, 13: undiluted hole of filter cloth, 14: filtration chamber, 15: filtrate discharge hole, 16 ... compressed fluid supply hole, 17 ... compressed fluid supply passage, 18 ... cut groove, 19 ... bolt nut, 27 ... filtrate discharge passage of the holding frame.

Claims (4)

(57) [Claims] 1. A substrate (2) having a filtrate hole (7) communicating with a filtration bed portion and discharging a filtrate of the filtration bed portion, and a compression membrane (2) disposed on the filtration bed portion of the substrate (2). 4)
And a filtrate discharge passage (27) for communicating the surface of the filtration bed portion (9) of the compression membrane (4) with the filtrate hole (7) of the substrate (2). And a press frame (5) attached to the press membrane (4) to press and hold the periphery of the press membrane (4). 2. A concave portion (3) is formed in a filtration bed portion of the substrate (2), the compressed film (4) is housed in the concave portion, and the holding frame (5) is formed in the concave portion. The compressed filter plate in the filter press according to claim 1, wherein the compressed filter plate is fitted to the filter press. 3. The holding frame (5) is formed at a portion of the filtrate discharge passage (27) communicating with the surface of the filtration bed portion of the compression membrane (4), and the filtrate discharge passage (27).
The press filter plate in the filter press according to claim 1 or 2, further comprising a cut groove (18) communicating with the filter press. 4. The substrate (2) has a filtrate discharge hole (15) formed therethrough in the thickness direction, and the filtrate hole (7).
The compressed filter plate in the filter press according to any one of claims 1 to 3, wherein the filtration bed portion and the filtrate discharge hole (15) are communicated with each other.