JP2518723Y2 - Filter press filter plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a filter plate of a side-feed type filter press, in particular, an undiluted solution supply port thereof.

(Prior Art) In a filter press in which a large number of filter plates are closely arranged and a stock solution for filtration is supplied into a filter chamber formed between these filter plates for filtration, a squeezing pressure is applied during a filtering operation. In order to prevent a part of the undiluted solution in the filter chamber from flowing backward through the undiluted solution supply port when the height is increased, a undiluted solution supply port penetrating the frame portion,
An undiluted solution passage communicating with a filtering chamber formed by stacking a filtering plate and a pressure filtering plate is formed on the filtering plate, and the opening on the filtering chamber side of this undiluted solution passage is closed by a thick part provided on the rubber sheet for pressing. This is known (see Japanese Utility Model Publication No. 47-42557). In addition, a mouthpiece for supplying the undiluted solution which is opened in the filter chamber is sandwiched by a pair of filter cloths, and the downward opening of the mouthpieces is closed by a cover attached to the filter cloth (Japanese Utility Model Publication No. 58-13925). (See) is known.

(Problems to be Solved by the Invention) However, in the conventional device, the filter chamber side opening of the stock solution supply passage is closed by the expansion of the rubber sheet (diaphragm) for compression. It requires a press, and since the opening is not closed when starting the pressing, the stock solution in the filter chamber flows back at the same time when the pressing starts, and the filter cloth is laid on the rubber sheet surface. Cake is attached to the filter cloth, and since the cake adhering surface is in contact with the opening, the cake adheres to the opening, and the adhering cake hinders the supply of the undiluted solution. There is a problem that the thick part and the cover of the filter cloth are misaligned and the effect is easily lost, and the cleaning water is supplied as undiluted solution when cleaning the cake and filter cloth by supplying the cleaning water from the filtrate discharge hole. I couldn't prevent myself from focusing on my mouth and coming off.

This invention, in the filter plate of the side-feed type filter press, can open and close the undiluted liquid passage without using the diaphragm for compression, not only during compression,
It is intended to provide a filter plate capable of preventing backflow even during cake washing.

(Means for Solving the Problem) A filter plate of a filter press according to the present invention has a stock solution supply port bored in the vicinity of a frame portion, and a part of the periphery of the stock solution supply port opens on a side in contact with a filter bed. In the filter plate of the side-feed type filter press that forms the undiluted solution passage for the filter chamber, the undiluted solution passage is formed into a tube shape by a flexible thin plate such as rubber, and contracts when the internal pressure is reduced. A tubular opening / closing valve that opens the passage and expands when the internal pressure is applied to close the stock solution passage is attached, and a fluid passage for supplying pressurized fluid to the tubular opening / closing valve is formed in the frame. To do. The filter plate may or may not be provided with a squeezing diaphragm. Further, the tubular on-off valve described above can have an arbitrary cross-sectional shape such as a cylindrical shape or a rectangular tube shape.

(Function) When the pressure inside the tube-shaped on-off valve is reduced, the tube-shaped on-off valve contracts and the undiluted solution passage is opened, so by supplying undiluted solution to the undiluted solution supply port, this undiluted solution is supplied to the filter chamber for filtration. Done. Further, when a high-pressure fluid is supplied to the tube-shaped on-off valve, the tube-shaped on-off valve expands and the stock solution passage is closed, so if the tube-shaped on-off valve is expanded before squeezing and washing, the stock solution in the filter chamber or The wash water will not flow out from the undiluted solution supply port.

(Example) FIG. 1 shows an example in which a stock solution supply port is provided outside the frame portion. That is, a horseshoe-shaped outer ear 2 is provided at the center of the upper side of the rectangular frame portion 1, and a penetrating stock solution supply port 3 is bored in the outer ear 2. Then, when the undiluted solution for filtration is supplied to the undiluted solution supply port 3, the undiluted solution is filtered by the filter cloth F (see FIG. 3) between the filter plates through the undiluted solution passage 4 below the undiluted solution supply port 3. The filtrate that has been passed through the filter cloth F is discharged from the filter beds 5 formed on the inside and outside of the frame 1 on both the front and back sides and from the filtrate passages 6 at the upper left corner and the lower left and right corners, and passes through the eyes of the filter cloth F. The non-capable particles are captured by the filter cloth F to form a cake. It should be noted that rectangular outer ears 7 are projectingly provided at the four corners of the frame 1 at the top, bottom, left and right, and arms 8 are projecting outwardly at the left and right side pieces, and a filter plate is provided via the left and right arms 8, 8. Slide on the left and right side plates 9, 9.

Thus, in this embodiment, a tubular open / close valve 10 is provided across the raw liquid passage 4 at the lower end of the raw liquid passage 4 continuing from the upper raw liquid supply port 3. This tubular open / close valve
10 is a rubber tube as shown in FIG. 2 and FIG.
A square plug 12 is fixed to one end of a ring 11 by a ring 13, and a square holed plug 14 is fixed to the other end of the ring 11 by a ring 15, respectively. 14 is fitted and fixed, and the center hole of the perforated plug 14 has a fluid passage 16 provided along the upper side of the frame 1 and a fluid supply port 17 penetrating the outer ear 7 at the upper right corner (see FIG. 1). ) And a switching valve (not shown) to a high pressure source and a low pressure source.

In the above structure, when a low pressure source is connected to the fluid supply port 17 (see FIG. 4), the rubber tube 11 contracts as shown by the chain line (11) to open the stock solution passage 4 and supply the stock solution for filtration to the stock solution. It flows from the mouth 3 through the stock solution passage 4 into the filter chamber. When a high pressure source is connected to the fluid supply port 17, the rubber tube 11 expands as shown by the solid line to close the stock solution passage 4,
The communication between the filter chamber and the stock solution supply port 4 is cut off.

FIG. 5 is an example in which a stock solution supply port is provided inside the frame portion. That is, an inner ear 22 is formed inside the center of the upper side of the frame portion 21, and a rectangular undiluted solution supply port 23 is bored in this inner ear 22, and this undiluted solution supply port 23 passes through the undiluted solution passage 24 at the lower end to the filter bed 25.
It is connected to both front and back sides. Then, the tubular on-off valve 26 is fixed across the stock solution passage 24 in the same manner as in the above-mentioned example. However, in this example, the fluid passage is perpendicular to the upper side of the frame 21.
27 is provided, and a fluid supply pipe for operating the tubular open / close valve 26 is connected to each filter plate.

(Effect of the Invention) This invention provides a tube-shaped on-off valve in the stock solution passage that connects the stock solution supply port of the filter plate and the surface of the filter bed, and decompresses and pressurizes the inside of the tube-shaped on-off valve. Since it opens and closes the above-mentioned undiluted solution passage, it can be applied to a filter plate of a type that does not have a diaphragm for squeezing. It is also effective in preventing backflow at the time of washing, and since the pressing or water washing can be started after the stock solution passage is completely closed, no backflow occurs when starting the pressing or water washing. Further, since a tube-shaped on-off valve is provided in the undiluted solution passage that connects the undiluted solution supply port of the filter plate and the surface of the filter bed, the cake of the filter cloth is provided as if a thick part was provided on the diaphragm or a cover was attached to the filter cloth. Will not adhere to the other parts, nor will the above-mentioned thick portion or cover be displaced.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG.
FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, and FIG. 5 is a front view of the main part of the modification. 1, 21: Frame part, 3, 23: Stock solution supply port, 4, 24: Stock solution passage, 5, 25: Filter bed, 10, 26: Tubular on-off valve, 16, 27:
Fluid passage.

Claims (1)

(57) [Scope of utility model registration request] 1. An undiluted solution supply port is bored in the vicinity of the frame portion,
In a filter plate of a side-feed type filter press in which a part of the circumference of the stock solution supply port is opened on the side in contact with the filter bed to form a stock solution passage for the filter chamber, a flexible material such as rubber is provided in the stock solution passage. It is formed into a tube shape by a thin plate, and it is contracted when the internal pressure is reduced to open the stock solution passage and expanded when pressurized inside to close the stock solution passage. A filter plate for a filter press, characterized in that a fluid passage for supplying the liquid is formed in the frame.