JPS6029528B2 - filter press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a filter press, particularly a filter press related to a high-pressure dewatering system.

As is well known, in a filter press, furnace plates covered with furnace cloth are pressed together to form a sealed furnace sieve chamber between the furnace slopes, and the raw liquid is pressurized into the furnace sieve chamber. The filter press currently used in the chemical industry uses a high-pressure dehydration type to further reduce the moisture content of the furnace water that accumulates in the furnace sieve chamber after the furnace operation. filter presses are widely used. As is known, the high-pressure dehydration type filter press consists of a rubber sheet inserted between a furnace plate and a furnace cloth stretched over its surface. A common structure is to supply high compressed air or high water pressure between the furnace plate and the rubber sheet, expand the rubber sheet, and compress the furnace inside the furnace chamber to dehydrate it. In this case, the dewatering efficiency is further increased. For this reason, one side of the rubber sheet is made to have an uneven surface similar to the surface of the other furnace plate, and water guide grooves are provided so that the furnace liquid that oozes out due to pressure can be quickly transferred. It's normal. As mentioned above, this type of high-pressure dehydration type filter press can perform effective filtration by squeezing out the moisture accumulated in the filtration chamber by compressing the rubber sheet, and can also reduce the water content of the filtrate. Therefore, it has the advantage of being easier to handle, but it has the disadvantage that it is more expensive as a filter press than a normal filter press.

In particular, the rubber sheet that compresses the furnace birch must be specially molded, as it needs to have a water guide groove on one side facing the furnace chamber, and it must be large enough to cover one side of the furnace plate. The production cost is extremely high due to the high temperature required.

In addition, as mentioned above, this type of high-pressure dehydration type filter press often passes raw solutions containing chemicals through the furnace, and because it is expanded under high fluid pressure, the damage rate is high, and maintenance is difficult. The problem was that it was expensive.

In particular, chemicals can be avoided by coating the surface of the rubber sheet with a chemical-resistant resin material. However, since conventional rubber sheets have an uneven surface to form water guide grooves on the surface, even if it is technically possible, the product itself is extremely expensive, so it is hardly ever put into practical use. That is the reality. The present invention has been researched and developed in view of innovative aspects, and its main purpose is to insert a rubber sheet with a flat surface between a furnace plate and a furnace cloth placed on the surface of the furnace plate, and to A porous plate with excellent water permeability, such as a sturdy metal or synthetic resin net with excellent chemical resistance, is inserted between the furnace cloth and the above-mentioned furnace cloth, and a flat rubber sheet and a porous plate are combined. The present invention aims to provide a high dehydration type filter press that has the same effect as a conventional rubber sheet having an uneven surface.

That is, in the present invention, a porous plate separate from the rubber sheet is inserted in place of the unevenness formed on the surface of the rubber sheet, and this porous plate is used to form water guide grooves on the surface of the rubber sheet. .

The greatest effect of the above combination in the present invention is that a flat rubber sheet can be used as the rubber sheet.

Such rubber sheets are commercially available ready-made products, and because they are inexpensive and have smooth surfaces, they can be coated with soft materials such as Pipalon, polypropylene, and vinyl chloride, which have excellent chemical resistance. can. Of course, chemical-resistant treatment of rubber sheets can be applied directly to the sheet surface.
Alternatively, the surface may be coated with a film made of the above-mentioned material. On the other hand, since the porous plate forming the water guide groove may be a commercially available synthetic resin net, it can also be obtained at a low price.

As explained in the examples below, this porous plate is attached by fixing it to the back side of the furnace cloth facing the rubber sheet, and in actual furnace work, the rubber sheet and the rubber sheet are attached each time the plate is opened. Instead of being set between the furnace cloths, it is kept attached to the surface of the furnace cloth at all times and is automatically inserted between the rubber sheet and the furnace cloth as the furnace plates are opened and pressed.

Of course, it is detachably fixed to the furnace cloth so that it can be removed and replaced if the porous plate itself is damaged or the furnace cloth is damaged. Examples illustrating the filter press according to the present invention will be described below to clarify other features.

Figure 1 is an enlarged vertical cross-sectional view of the main part showing a state in which some furnace plates are open and others are open, and Figure 2 is an enlarged longitudinal sectional view of the main part showing a state in which high water pressure is supplied to the furnace chamber formed by the furnace plates. FIG. 3 is an enlarged vertical cross-sectional view of the main part showing a state in which the furnace law is compressed.

In these drawings, 1 and 2 represent furnace plates, 3... is a furnace cloth stretched so as to cover the surface of each furnace plate, and 4 is between one furnace plate 1 and the above-mentioned furnace cloth 3. A flat rubber sheet 5 is inserted between the rubber sheet 4 and the furnace cloth, and numeral 5 is a porous plate (hereinafter referred to as a net) having water permeability such as a synthetic resin silk body.
). The furnace plates 1 and 2 are the same as those used in ordinary filter presses, with hanging arms provided on both sides of the furnace plate hanging over the side bars, and a large number of plates arranged in an overlapping manner. Furnace chamber 6 is pressed in contact with the furnace plate and sealed in between by a depression on the surface of the furnace plate.
... will be formed respectively. In this embodiment, each furnace plate has a liquid feeding hole 7 at a common position.
A ring-shaped connecting member 8 is inserted between the liquid feeding holes to form a single liquid feeding path passing through the entire furnace plate. The connecting member 8 shown here is suspended above the filter press by a hanging shell 9 in the form of a thinner band, and when the plate is opened as shown in Fig. 1, it hangs between the two furnace plates, and when the plate is closed, it hangs down. It is sandwiched between the liquid feeding holes of both furnace plates. Each connecting member is provided with a discharge hole 10 that communicates with the hollow part, and when the furnace plate is pressed and connected, the stock solution sent through the liquid sending path formed by this connection is passed through the discharge hole to each furnace. room 6
It is designed so that it can be supplied to... by the way,
Among the furnace plates arranged in a row, the furnace plate designated by reference numeral 1 has one water supply hole 11 bored from the upper part of the furnace plate along the center of the plate.
Furthermore, a branch hole 12 is provided at the tip of the water supply hole 11 to penetrate the furnace plate back and forth, so that high-pressure water that is press-in from the upper end of the water supply hole can be discharged from both ends of the branch hole. 4 is placed over the furnace plate 1 so as to close the mouth of this branch hole 12.

In this embodiment, the rubber sheet 4 is a flat rubber sheet having a width equal to the width of the oven plate, and is bent in two with the upper green of the oven plate as a folding point, so that both sides of the oven plate can be coated at the same time. .

Holes 4a and 4b are previously opened in this rubber sheet at positions corresponding to the entrances of the water supply hole 11 and the liquid feed hole 7, so as not to block each liquid path. On the other hand, the furnace cloth 3 stretched over each furnace plate is made by folding a piece of furnace cloth in half in the same way as the rubber sheet described above so as to cover both sides of the furnace plate. The one hung on one furnace plate 1 has holes 3a and 3b similar to those of the rubber sheet 4 at positions corresponding to the entrances of the water supply hole 11 and the liquid feed hole 7.

The mesh body 5 is fixed to the back surface of the furnace cloth 3 stretched over the furnace plate 1, that is, the surface facing the rubber sheet 4. The silk body 5 is formed in a size that covers approximately the surface of the recess of the furnace plate 1 that forms the furnace chamber 6, and as shown in FIG. It is detachably attached by tying together the thin strips 13 that have been sewn in advance.

In addition, 14 in the figure is a protrusion provided on the surface of the tank-side furnace plate 2 to form a water guide groove. The filter press according to the present invention is constructed as described above, and each furnace plate is provided with a water supply hole 11 as shown in the figure, and the furnace plate 1 covered with the rubber sheet 5 is alternately arranged with the other furnace plate 2. The connecting members 8 are set side by side and pressed by the pressure of the press device as described above to form the furnace chamber 6 between the furnace plates 1 and 2, and the connecting members 8 are hung between each furnace plate.
is sandwiched between each liquid feeding hole 7, 7, and passed through so that the stock solution can be supplied into each furnace chamber from one end of the furnace plate.

In this case, the furnace cloth 3 and the rubber sheet 4 are placed between the thick part of the green around the furnace plate.
At the same time, the edges of the holes 3a and 4a made in the furnace cloth 3 and rubber sheet 4 are sandwiched between the liquid feed hole 7 and the connecting member 8 to seal the surrounding area of the furnace filtration chamber. Prepare for work. The stock solution pumped through the liquid sending hole is delivered to the discharge hole 1 of the connecting member 8.
0 to each furnace chamber 6, and is heated through the furnace cloth stretched over the surface of the furnace plate.

The furnace liquid that has passed through the furnace cloth of the furnace plate 1 passes between the nets fixed to the back side of the furnace plate and is collected in a liquid collecting hole (not shown), and is recovered, while the furnace liquid passes through the furnace cloth of the other furnace plate 2. The collected furnace liquid passes between the protrusions 14 formed on the surface of the furnace plate, and is collected and recovered in the liquid collection hole. When dehydrating the strawberry that has been pushed into the furnace chamber 6 upon completion of the furnace work, high pressure water or high pressure vertical air is supplied from the supply hole 11 while keeping the furnace plate in a clamped state. Rubber sheet 4 attached to the surface of board 1
is expanded as shown in Figure 2, and the furnace temperature is compressed. The furnace liquid squeezed by this compression passes through the net 5 inserted between the furnace cloth and the rubber sheet and each of the protrusions 14, and is collected from the liquid collection hole in the same way as described above. become. As described above, the filter press according to the present invention can be expected to achieve the same furnace filtration and dewatering effects through exactly the same operation as the conventional high-pressure dehydration type filter press using a rubber sheet integrally formed with water guide grooves. The filter press according to the present invention uses a flat sheet as the rubber sheet for compressing the furnace air, and also uses ordinary silk as the water guide groove, and each of these is generally commercially available. This has the advantage that it can be provided at a much lower price than conventional rubber sheets with water guide grooves.

In particular, since the rubber sheet in a filter press is easily damaged and fatigued and needs to be replaced, the present invention has an extremely large economical effect in terms of maintenance and management. Moreover, since the rubber sheet only needs to be a flat sheet, it can be used for various types of furnace plates having different surface areas without being restricted by a mold like that of a subordinate furnace. Furthermore, since the surface of the above-mentioned rubber sheet is flat, it is easy to perform chemical-resistant treatment on the surface of the sheet, which was conventionally considered difficult in molding.Therefore, it is effective as a filtering device for wastewater discharged from the chemical industry, etc. There are advantages that can be taken advantage of.

In this case, the surface treatment of the sheet may be performed by directly coating the surface with a synthetic resin material, or by adhering or polymerizing a film made of the same material to the surface of the rubber sheet, and the effect can be expected. Furthermore, since the rubber sheet of the present invention is flat and has a uniform thickness over its entire surface, when it is expanded under high pressure during dewatering of the furnace, the entire surface facing the furnace chamber is evenly expanded. Because it stretches, the material has the advantage of being able to be used for a long period of time without concentrating on fatigue.

This point is particularly remarkable compared to conventional grooved rubber sheets. In other words, because conventional rubber sheets have different wall thicknesses due to the formation of grooves, when they expand, the thinner parts at the bottom of the grooves mainly elongate, and as a result, fatigue concentrates in these parts, making them prone to damage and extremely shortening their lifespans. It was. In addition to the above-mentioned advantages as a filter press, particularly in the present invention, the porous plate forming the water guide grooves, that is, the entire structure may be a commercially available synthetic resin net, which can be obtained at a low price like a rubber sheet. Therefore, it is very advantageous in implementation, and at the same time, since this silk body can be easily attached to the monkey cloth by tying a string, it can be exchanged freely and easily. On the other hand, since this net body is fixed to the sarufu, it hangs together with the sarufu without falling when the sarufu is opened, and when closing the sarufu, it is attached at the same time as the sarufu is set. Since it is inserted and set between the rubber sheet and the opening/closing plate, there is no problem with the operation of the opening/closing plate, and it is possible to expect the same working efficiency as when liquid guide holes are provided on the surface of the rubber sheet.

[Brief explanation of the drawing]

The drawings show an embodiment of the filter press according to the present invention, and FIG. 1 is an enlarged vertical cross-sectional view of the main parts showing a state in which some furnace plates are opened and others are closed. 3 is an enlarged vertical cross-sectional view of the main part showing a state in which the furnace structure is compressed by supplying high water pressure to the furnace chamber formed by the furnace plates, and FIG. 3 is an exploded perspective view of the furnace cloth and silk body. 1 and 2 are furnace plates, 3 is furnace cloth, 4 is rubber sheet, 5 is silk body,
6 is a furnace chamber, and 13 is a string for fixing the mesh body. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. In a filter press in which a filtration chamber is formed between the filter plates by pressing filter plates having filter cloth stretched on their surfaces so that they are in contact with each other, one of the contacting surfaces is The filter plate is provided with a flow path for supplying pressure fluid to the filtration chamber, and a rubber sheet is inserted between the filter plate and a filter cloth stretched over the surface of the filter plate, and the rubber sheet and the filter cloth are interposed between the filter plate and the filter cloth. A water-permeable porous plate stretched across substantially the front surface of the filter chamber is inserted between the filtration chamber and a string is sewn to the back surface of the filter cloth, and by tying the string, the porous plate is A filter press characterized by a plate that can be attached and detached freely. 2. The filter press according to claim 1, wherein the porous plate is a net body. 3. The filter press according to claim 1, wherein the rubber sheet is flat and the surface on the filtration chamber side is coated with a chemical-resistant synthetic resin material.