JPS6253708A - Diaphragm for filter press - Google Patents

Abstract

PURPOSE:To insure undeformable filtrate passage, by communicating through cylindrical bodies attached to the peripheral edge of a diaphragm of a filter press, a filtrate drainage channel provided in the diaphragm with filtrate discharge holes of a filter press body. CONSTITUTION:A stock liquid in a slurry form is supplied through stuck liquid passing holes into a stock liquid chamber defined between two adjacent filter films. A pressurizing fluid is then forced from fluid passing holes into a pressurizing fluid chamber, thereby bulging a diaphragm 3 outward to press a filter film 4 against toward the stock liquid chamber. Thus the stock liquid is compressed between the filter films, so that the filtrate passes through the filter liquid chamber and is bulged on the inner peripheral surface of the diaphragm 3. The filtrate is conducted through a channel 16 to cylindrical bodies 18 on a periphery 10, conducted therefrom through a outlets 19, a communicating hole 20 in to a filtrate discharge hole 21, discharged or recovered.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a diaphragm for squeezing used in a filter press for separating a slurry-like raw solution into solids and filtrate, and in particular, a diaphragm that serves as a filtrate extraction port. 51133 at the periphery of the diaphragm.

(Prior Art) Conventionally, a diaphragm of a filter press was provided to separate a stock solution chamber and a pressurized fluid chamber, and was brought into contact with a filter membrane on the stock solution chamber side, and a groove for drawing out the filtrate was provided on the contact surface. , and this groove was extended to the periphery of the diaphragm sandwiched between the plywood sheets, and communicated with the filtrate outflow hole of the filter press main body.

Then, the diaphragm is bulged toward the stock solution chamber by injecting the squeezing fluid into the pressurized fluid chamber, and the resulting pressure squeezes the slurry stock solution in the stock solution chamber via 'aS, and the filtrate is poured into the groove. The filtrate is guided along the periphery of the diaphragm and then to the filtrate outlet hole for discharge or recovery.

(Problem to be Solved by the Invention) However, the diaphragm is made of a relatively soft and flexible material, and the periphery of the diaphragm does not allow the diaphragm body to be attached to a supporting body such as a core root in an airtight or liquid-tight manner. Due to necessity, the diaphragm, which is the filtrate extraction port, There is a problem in that the peripheral grooves are crushed or deformed and become partially or completely obstructed, which impedes the outflow of the filtrate.

Therefore, the technical problem to be solved by the present invention is to secure a filtrate flow path in the peripheral portion of the diaphragm that will not be crushed or deformed due to the above-mentioned causes.

(Means for solving the problem) The technical means for solving the above problem is to partition the stock solution chamber and the pressurized fluid chamber, and to contact the filter membrane on the stock solution chamber side and to draw out the filtrate to the contact surface. In the diaphragm of the filter press, the groove is provided with a filtrate outflow hole provided in the main body of the filter press, and the groove is communicated with a filtrate outflow hole provided in the main body of the filter press by a cylinder made of a hard material attached to the peripheral edge of the diaphragm.

In the above configuration, the cross-sectional shape of the cylinder is circular.

Including ellipses, ovals, polygons, etc. Further, the material of the cylinder includes hard rubber, hard plastic, fLn, and the like. The cylindrical body can be installed in one or more pieces, and the manner of attachment is such that the cylindrical body is removably attached to a groove of a corresponding shape provided on the periphery of the diaphragm, or it can be embedded in the periphery of the diaphragm. Alternatively, a strip member having a cylinder attached thereto in any of the above-mentioned manners may be removably attached to the peripheral edge of the diaphragm.

(Function) The cylindrical body made of a hard material is not easily crushed or deformed by the clamping pressure of the diaphragm holder or by the bulging deformation of the diaphragm. A flow path for the filtrate is ensured.

(Example) Next, the configuration of a first example of the present invention will be described based on FIGS. 1 to 5.

Figure 1 shows a filter plate 1, which is a constituent unit of a filter press.
This filter plate 1 is constructed by mounting diaphragms 3 according to this embodiment on both sides of a heart root 2, and mounting a filter membrane 4 on the outer surfaces of both diaphragms 3 as shown in FIG. There is. A stock solution chamber (not shown) is configured outside the filter membrane 4 to introduce a slurry stock solution.

The core root 2 is formed by covering a core metal 5 made of steel with a surface material 6 made of ebonite or hard rubber, and has a thin inner circumferential portion 7 and a thick peripheral edge portion 8. And in the center of heart root 2,
A stock solution passage hole 9 is provided.

Next, the diaphragm 3 is formed into a sheet shape from a flexible material such as relatively soft rubber, and its peripheral edge 10 is formed into a flat shape.
At the same time, the part of the stock solution passage hole 12 corresponding to the stock solution passage hole 9 is also fixed to the core root 2 by a bolt 13. A large number of protrusions 15 are arranged and provided on the outer surface of the inner peripheral portion 14 of the diaphragm 3, thereby providing grooves 16 for guiding filtrate between these protrusions 15.

Further, a groove 17 having an arcuate cross section is provided in the lower corner of the peripheral edge 10 of the diaphragm 3, and a metal cylinder 18 is fitted into this groove 17, with one end of the cylinder 18 It communicates with the groove 16, and the other end communicates with a discharge port 19 formed through the diaphragm 3 and the core root 2. The discharge port 19 communicates with a filtrate outflow hole 21 passing through the filter plate 1 via a communication hole 20 provided inside the core root 2 .

In addition, the inner peripheral part 7 of the core root 2 and the inner peripheral part 14 of the diaphragm 3
There is a pressurized fluid chamber 22 configured airtight or liquidtight between the
A fluid passage hole 2 is formed through the upper corner of the filter plate 1.
3 is in communication with this pressurized fluid chamber 22.

This embodiment configured as described above is used as follows.

First, a slurry-like stock solution is supplied from the stock solution passage hole 12 to a stock solution chamber formed between the filter membrane 4 and an adjacent filter membrane (not shown). Next, a pressurizing fluid (gas or liquid) is forced into the pressurized fluid chamber 22 through the fluid passage hole 23, so that the diaphragm 3 bulges outward and presses the m-membrane 4 toward the stock solution chamber.

In this way, since the stock solution is squeezed between the filter membranes, the solids in the stock solution are left in the stock solution chamber, and the filtrate passes through 11g14.
A line is applied on the inner circumference 14 surface of the diaphragm 3. The filtrate is then guided by the groove 16 to the cylinder 18 of the peripheral portion 10,
The filtrate is led from the cylindrical body 18 through the outlet 19 and the communication hole 20 to the filtrate outflow hole 21, where it is discharged or collected.

After the squeezing operation is completed, the fluid in the pressurized fluid chamber 22 is pulled back through the fluid hole 23, and the cake remaining in the stock solution chamber is dropped downward and removed by expanding the gap between the filter membranes. Or it will be collected.

In addition, as another example of the use of this embodiment, the filter plate 1 is constituted only by diaphragms on both the left and right sides and filter membranes attached to the outer surfaces of the diaphragms, and the peripheral edges of the diaphragms are connected to each other airtightly or liquidtightly. , the space between both diaphragms may be used as a pressurized fluid chamber (not shown).

Next, a second embodiment of the present invention will be described based on FIG. 6. The cylindrical body 18 is embedded inside the thick wall of the peripheral edge of the diaphragm 3. In other respects, the configuration and usage conditions are the same as those of the first embodiment.

(Effects of the Invention) The present invention has the effect of ensuring a filtrate flow path at the peripheral edge of the diaphragm.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing the first embodiment of the present invention in use, Fig. 2 is a vertical sectional view of the main part thereof, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 is FIG. 3 is a sectional view taken along the line AA in FIG. 3, FIG. 5 is a sectional view taken along the line BB in FIG. 1...Filter plate 3...Diaphragm 4...Filter membrane 10...Peripheral portion 16...Groove' 18...Cylinder body Applicant Makino Iron Works Co., Ltd. Agent Patent attorney Hidehiko Okada (2 others) Figure 3

Claims (4)

[Claims] (1) In the diaphragm of the filter press, which separates the stock solution chamber and the pressurized fluid chamber, contacts the filter membrane on the stock solution chamber side, and is provided with a groove for drawing out the filtrate on the contact surface. A diaphragm for a filter press, characterized in that a filtrate outflow hole provided in a main body is communicated with a cylindrical body made of a hard material attached to a peripheral edge of the diaphragm. (2) The diaphragm of a filter press according to claim 1, wherein the cylindrical body is removably fitted into a groove provided on the peripheral edge of the diaphragm. (3) A diaphragm for a filter press according to claim 1, wherein the cylindrical body is embedded in a peripheral portion of the diaphragm. (4) The filter according to claim 1, wherein the attachment portion of the cylinder at the peripheral edge of the diaphragm is formed separately from the diaphragm body and is removably attached to the diaphragm body. Press diaphragm.