JPH10118413A - Filter plate packing for filter press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easy to fit a packing into a filter plate, simplify a structure because the packing has none of the fins which cause a problem with deformation of fluid flow, without clogging of a fluid passage hole, and further, prevent the flow resistance of the fluid from being deteriorated and also prevent the packing from being deformed into the fluid passage hole, although the deformation is slight. SOLUTION: This packing 2 is fitted into the periphery of a fluid passage hole 1a in a filter plate 1A and is arranged around the fluid passage hole 1a of the filter plate 1 when the filter plate 1 is clamped and opened. In addition, the packing 2 consists of an annular main body 2f with a smooth surface, an open hole 2a which is formed in the center of the main body and has a larger inner diameter than the fluid passage hole 1a of the filter plate 1. Further, an annular fitting protrusion 2b is tightly fitted into a fitting groove 1b formed, in annular shape, around the fluid passage hole 1a of the filter plat 1. Thus the main bodies 2f of the packings 2 come into close contact with each other when the filter plate 1A is clamped to prevent a fluid from leaking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter plate packing for a filter press for sealing around a fluid passage hole through which a filtrate or a compressed gas of a filter plate of the filter press passes.

[0002]

2. Description of the Related Art Conventionally, various types of filter plate packings of this type are known. For example,
As shown in FIG. 5, a packing 78 described in Japanese Patent Publication No. 168 is fitted in a stock solution hole 72 of a pressing plate 71 having a filter cloth 75 and a pressing sheet 74 on the surface. The packing 78 is a circular packing having a substantially constant thickness and having a shoulder 79 formed in a ring shape with the inner diameter side facing inward. On its outer surface, it rises slightly from the circumference with a certain interval on the outer diameter circle of the packing,
An outer peripheral wall (fin) 80 protrudes so as to be slightly inclined toward the inner diameter direction. A gap 81 closed to the outside is formed between the inner wall surface of the outer peripheral wall 80 and the outer surface on the inner diameter side of the packing. In addition, this packing 78 has a left-right paired plane-symmetric relationship,
The inner diameter openings are connected and supported by the band members 22, 22, 22 having a length substantially equal to the thickness of the filter plate ear along the filtrate passage hole 77, and both openings 77a of the filtrate passage hole 77 are provided. , 77b at the same time, a pair of packings 78, 7
8 so that the shoulders 79, 79 can be fitted. In addition, as shown in FIG.
The packing 42 disclosed in Japanese Patent Publication No. 7 is fitted around the opening edge of the conduit 51 of the filter plate 41, has a seal lip 61 inclined inward, and has a recess 211 provided inside the seal lip 61. ing. And, on the other side of the packing 42,
An engaging ridge 62 for preventing the packing 42 from falling off from the pipeline 41 is provided around the groove 111 provided around the inside of the opening edge of the hole.

[0003]

However, in the packing structure shown in FIG. 5, the packing structure is somewhat complicated, and the sealing fin is crushed and deformed by the pressing force when tightening the filter plate. The desired sealing function may be impaired. The packing 42 in FIG.
There is a problem that it is difficult to fit the inner engaging projection 62 to the groove 111 of the filtrate, and it can be fitted only in a very loose state, and the sealing function is deteriorated. Further, since the packing is loosely fitted into the filter plate, the packing may be detached from the filter plate. In addition, groove 1
11 is difficult to process. There is also a problem that the engagement ridge portion and the seal lip 61 may be deformed and enter the conduit 51 which is a filtrate hole of the filter plate. Therefore, an object of the present invention is to solve the above-mentioned problems, and it is easy to attach to a filter plate, it is possible to have a simple structure because there is no fin, and the problem that the fluid flow due to the fin is deformed. To provide a filter plate packing for a filter press that does not cause clogging of a fluid passage hole, does not lower fluid flow resistance, and does not deform and enter the fluid passage hole even if it is slightly deformed. It is in.

[0004]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, the present invention is configured as follows. According to the invention according to claim 1, in the filter plate packing of the filter press fitted around the fluid passage hole of the filter plate, when the filter plate is tightened and the filter plate is tightened and released, the fluid passage hole of the filter plate is removed. An annular body disposed around and having a flat surface, an opening formed in the center of the body and having an inner diameter larger than the fluid passage hole of the filter plate, and formed on the back surface of the body, and An annular engaging projection which is fitted closely into an annular engaging groove around the fluid passage hole of the filter plate. Claim 2
According to the invention according to the first aspect, in the first aspect of the invention, the engagement groove is a dovetail groove, and the engagement protrusion may have a trapezoidal cross section capable of being closely fitted to the dovetail groove. . According to the above configuration, it suffices to simply fit the engagement protrusion of the packing into the engagement groove of the filter plate so as to press it into the groove, and the filter plate can be easily attached to the filter plate. In addition, the packing is formed in a simple annular shape and the surface is flat, and there is no fin on the surface, so that the packing can be made a simple structure as a whole and the fins deform the fluid flow. In addition, the fluid passage hole is not clogged, the flow resistance of the fluid is not reduced, and even if the packing is slightly deformed, it does not deform and enter the fluid passage hole.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below in detail with reference to FIGS. The filter plate packing 2 of the filter press according to the first embodiment of the present invention includes, as shown in FIGS.
c so as to cover the periphery of the opening of the fluid passage hole 1a penetrating through the filter plate 1c. When the filter plates are fastened, the adjacent filter plates 1 are fastened to each other so that the fluid passage holes 1a penetrate each other. At this time, they are in close contact with each other so as to prevent leakage of fluid such as filtrate and compressed gas between the fluid passage holes 1a. An annular dovetail groove 1b is formed on the outer periphery of the filter plate 1 on the opening side of the fluid passage hole 1a. The dovetail groove 1b is formed so as to have a cross-sectional opening that gradually widens from the groove opening side toward the groove bottom surface.

[0006] The filter plate packing 2 has a fluid passage hole 1 in the filter plate 1 when the filter plate is tightened and when the filter plate is tightened and released.
b, an annular main body 2 having a flat surface
The packing 2 is integrally formed of an elastic material, for example, a synthetic resin such as natural rubber, synthetic rubber, polyethylene, polypropylene, nylon, or fluororesin. The annular body 2f of the packing 2 has an opening 2 having an inner diameter slightly larger than the fluid passage hole 1a of the filter plate 1 by a dimension L.
a, and an inclined surface 2c that is inclined such that the inner peripheral surface of the opening gradually decreases from the surface of the packing body toward the back surface, that is, toward the filter plate. On the other hand, the outer peripheral surface has an inclined surface 2e that is inclined such that the outer diameter gradually increases from the front surface side to the rear surface side of the packing 2. On the back of packing 2, filter plate 1
Has an annular engaging projection 2b which is fitted in close contact with the engaging groove 1b. That is, the engagement protrusion 2b is formed to have a trapezoidal cross-sectional shape that gradually widens from the packing surface side to the back side. Further, in some cases, as shown in FIG. 1, the packing 2 has a notch 2d cut into the inclined surface 2c of the fluid passage hole 2a.
May be formed on the entire circumference so that air can be entrapped in the cut 2d.

According to the above configuration, the engagement protrusions 2b of the packing 2 need only be pressed tightly into the engagement grooves 1b of the filter plate 1 so as to be pushed. In this state, when performing filtration by tightening a large number of filter plates 1, the main bodies 2f, 2f of the packings 2, 2 between the adjacent filter plates 1, 1 are in close contact with each other, and the adjacent fluid passage holes 1a, 1a is communicated through the openings 2a, 2a of the two packings 2, 2. For example, when the fluid passage hole 1a is used as a filtrate passage hole, the fluid passage hole 1a is formed along the bottom of the filter plate during filtration. Is discharged to the outside of the filter press through a number of fluid passage holes 1a,..., 1a sealed and communicated with the packing 2. When the fluid passage hole 1a is used as a compressed fluid passage hole, the compressed fluid is supplied to a desired compressed sheet through a number of fluid passage holes 1a,. The squeeze sheet is expanded to perform squeeze filtration. That is, when the filter plates are tightened, the two packings 2, 2 are pressed and contacted between the two adjacent filter plates 1, 1 so that the surfaces of the main bodies thereof are in close contact with each other, and the fluid passing between the filter plates 1, 1 is performed. The periphery of the hole 1a is sealed to reliably prevent leakage of a fluid such as a filtrate or a compressed gas. Since the inner diameter of the opening 2a of the packing 2 is larger than the inner diameter of the fluid passage 1a of the filter plate 1, even if the packing 2 is crushed and elastically deformed, it does not protrude into the fluid passage 1a. It remains located around 1a and does not obstruct passage of fluid. When removing the packing 2 from the filter plate 1,
If b is pulled out from the engagement groove 1b of the filter plate 1, the packing 2 can be relatively easily removed from the filter plate 1.

According to the above embodiment, the engagement groove 1 of the filter plate 1
In this case, it is only necessary that the engagement protrusions 2b of the packing 2 be fitted into the packing plate 2 in such a manner that the engagement projections 2b are pushed into the filter plate 1b. Even if the engagement protrusion 2b of the packing 2 is difficult to fit into the engagement groove 1b and is not tightly fitted, the packing 2 between the filter plates 1 and 1 when the filter plate is tightened.
Is pressed in the direction of fitting into the engaging groove 1b of the filter plate 1, so that the fitting is more securely performed. Further, by forming the engaging groove 1b as a dovetail groove and the engaging protrusion 2b as a trapezoidal cross section, the packing 2 can be prevented from easily falling off the filter plate 1 with a simple structure. Further, the packing 2 has a simple annular shape and a flat surface, and has no fins on its surface. Therefore, the packing can have a simple structure as a whole, and a fluid flow is deformed by the fins. There is no problem due to this, even if the packing is deformed, it does not enter the fluid passage hole, and the fin does not enter the fluid passage hole and clog the fluid passage hole,
There is no reduction in fluid flow resistance.

The present invention is not limited to the above embodiment, but can be implemented in various other modes. For example, the ears 1c to which the packing 2 is attached are not limited to those protruding from the four corners of the rectangular plate-shaped filter plate body, but may be attached to a fluid passage hole formed in the square plate-shaped filter plate body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where a filter plate packing of a filter press according to an embodiment of the present invention is fitted into a fluid passage hole of a filter plate and a state where the filter plate packing is about to be fitted.

FIG. 2 is a partial front view in a state where the filter plate packing of FIG. 1 is fitted around a fluid passage hole of the filter plate.

FIG. 3 is a front view of the packing of FIG. 1;

FIG. 4 is a rear view of the packing of FIG. 1;

FIG. 5 is a cross-sectional view of a conventional filter plate packing fitted in a filtrate passage hole of the filter plate.

FIG. 6 is a cross-sectional view of another conventional filter plate packing fitted in a filtrate passage hole of the filter plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Filter plate, 1a ... Fluid passage hole, 1b ... Engagement groove, 1c ... Ear part, 2 ... Filter plate packing, 2a ... Opening, 2b ... Engagement protrusion,
2c: inclined surface, 2d: cut, 2e: inclined surface, 2f ...
Body.

Claims (2)

[Claims] 1. A filter plate packing of a filter press fitted around a fluid passage hole (1a) of a filter plate (1), wherein the filter plate has a fluid passage hole when the filter plate is tightened and when the filter plate is tightened and released. An annular body (2f) disposed around the periphery of the body and having a flat surface; an opening (2a) formed in the center of the body and having an inner diameter larger than a fluid passage hole of the filter plate; An annular engagement projection (2b) formed on the back surface and closely fitted to an annular engagement groove (1b) formed around the fluid passage hole of the filter plate. Filter plate packing of filter press characterized by the following. 2. A filter plate packing for a filter press according to claim 1, wherein said engaging groove is a dovetail groove, and said engaging projection has a trapezoidal cross section capable of being closely fitted to said dovetail groove.