JPS6236490Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an improvement of a filter cloth for a filter press with a fixed filter cloth.

(Prior art) In a bottom-feed type, side-feed type, or top-feed type filter press with a fixed filter cloth, a filter plate is provided with a stock solution inlet hole with a hole diameter approximately equal to the stock solution supply hole provided on the required side part of the filter plate. It is covered with cloth and fixed with a liquid supply fitting. The sludge supplied from the stock solution supply hole is sent to the filter chamber formed between the filter plates through the stock solution passage provided in the notch of the liquid supply fitting. Since filtration is also carried out in the part of the filter cloth that faces the raw solution passage connecting the filter cloth and the filter chamber, sludge accumulates on the part of the filter cloth that follows the raw solution introduction hole, gradually blocking the raw solution passage, making it difficult to supply sludge, and the raw solution This system has various problems, such as sludge layering and accumulation near the passage, impairing the airtightness of the filter chamber.

(Purpose of the invention) The present invention solves the above-mentioned problems, eliminates the accumulation and accumulation of sludge in and around the undiluted solution passage, and prevents clogging of the undiluted solution passage. This was completed with the aim of creating a filter cloth for a filter press with a fixed filter cloth that can maintain the airtightness of the filter chamber by eliminating stacking and accumulation of sludge.

(Structure of the invention) The present invention provides a stock solution introduction hole in a required side part of the main body of the filter cloth, and the part following the stock solution introduction hole is opposed to the stock solution passageway that connects the stock solution supply hole of the filter press and the filter chamber. It is characterized by being formed in a non-water-permeable part.

Next, the present invention will be explained in detail by taking the bottom feed type filter cloth fixed type filter press as shown in the drawing as an example. A stock solution introduction hole 2 is provided in the side part, and the stock solution introduction hole 2
A large number of radial notches 3 are uniformly provided on the edge of the hole. Reference numeral 4 denotes a water-impermeable part formed in the part of the filter cloth main body 1 that follows the stock solution introduction hole 2, which is the part facing the stock solution passage connecting the stock solution supply hole of the filter press and the filter chamber; 4 is formed by applying a mixed solution of a synthetic resin such as polyvinyl chloride-vinyl acetate copolymer and an organic solvent to the required portions of the filter cloth main body 1 to impregnate it. A water portion 4 is formed following a water-blocking portion 4' similarly formed at the edge of the stock solution introduction hole 2, and 5 is a support rod insertion portion formed at the upper edge of the filter cloth main body 1; Reference numeral 6 designates a stay engagement hole provided at the lower end of the filter cloth main body 1, and 7 designates a reinforcing cloth sewn near the hole edge of the stock solution introduction hole 2 of the filter cloth main body 1 as necessary. . On the other hand, 10 is a well-known filter cloth fixed type filter press body in which a filter cloth is mainly covered.
A support rod 13 installed at the upper end of each of the regular filter plates 11 and compressed filter plates 12 arranged alternately is a support rod 15 inserted into the support rod insertion part 5 at the upper edge of the filter cloth main body 1. The lower end of the filter cloth main body 1 is connected with a spring 16 so as to be elastically movable up and down, and the central part thereof is a stock solution supply hole 18 provided at the lower end of the normal filter plate 11 or compressed filter plate 12. A liquid supply fitting 17 fitted from both sides is passed through the stock solution introduction hole 2 of the filter cloth main body 1 and fixed by bolting, and both ends thereof are fixed by stays 19. The stock solution supply hole 18 and the filter chamber 20 are connected to the stock solution passage 2.
1, but the part of the filter cloth main body 1 that faces the stock solution passage 21 and continues to the stock solution introduction hole 2 leading to the filter chamber 20 is a non-water-permeable part sealed with synthetic resin or the like as described above. 4, so filtration is not performed in this part.

When this structure is used in the same way as a conventional filter cloth for fixed filter presses,
The stock solution supplied from the stock solution supply hole 18 provided in the ordinary filter plate 11 or the compressed filter plate 12 is introduced into the filter chamber 20 through the stock solution passage 21 as shown by the arrow in FIG. 1, and the dehydrated cake 30 accumulates between the filter cloths.The filter cloth main body 1, which has a stock solution introduction hole 2 corresponding to the stock solution supply hole 18 on the side part, is used as the stock solution supply hole 18 of the filter press. Since the part facing the stock solution passage 21 connecting the stock solution supply hole 18 and the filter chamber 20 and continuing to the stock solution introduction hole 2 is formed in the non-water passing portion 4, the stock solution supply hole 18
The undiluted solution is no longer filtered in the part facing the undiluted solution passage 21 leading from the filtration chamber 20 to the filtration chamber 20, and sludge is piled up in this part, which blocks the undiluted solution passage 21 and prevents the supply of the undiluted solution to the filtration chamber 20. The filter chamber 2 is caused by the sludge layered and accumulated near the raw solution passage 21.
This allows continuous filtration for a long period of time without compromising the confidentiality of the filter.
Furthermore, if the radial notch 3 is provided at the edge of the stock solution introduction hole 2 as shown in the illustrated embodiment, the liquid supply fitting 17 can be passed through the stock solution introduction hole 2 and into the stock solution supply hole 18. Furthermore, when bolted, the edge of the stock solution introduction hole 2 can be properly prevented from wrinkling or bulging, and the hole edge of the stock solution introduction hole 2 is also prevented from passing water. By forming the portion 4' subsequent to the water-impermeable portion 4, it is possible to prevent tearing and damage that is likely to occur from the stock solution introduction hole 2, resulting in even more excellent durability. Although it is preferable that the non-water permeable portion 4 has a water permeability of zero, it goes without saying that the water permeability may be significantly lower than that of other portions.

(Effects of the invention) As is clear from the above description, the present invention has a part of the filter cloth that is opposed to the stock solution passage connecting the stock solution supply hole and the filter chamber when the filter press is covered with water. This prevents filtration from being performed in this concentrate passage while the concentrate is being sent to the filtration chamber, and prevents filter slag from piling up and accumulating in the narrow concentrate passage or its vicinity. It solves the various inconveniences that occur, and has extremely great practical value as it solves the problems of conventional filter cloths for filter presses with fixed filter cloths.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the present invention, FIG. 2 is a partially cutaway perspective view of the main part, and FIG.
The figure is a partially cutaway perspective view of a fixed filter cloth type filter press using the present invention, FIG. 4 is a partially cutaway front view, and FIG. 5 is a partially cutaway side view of the main parts. 1: Filter cloth main body, 2: Stock solution introduction hole, 3: Notch,
4: Water-impermeable area.

Claims (1)

[Claims for Utility Model Registration] 1. A stock solution introduction hole 2 is provided in a required side portion of the filter cloth main body 1, and a stock solution passageway that connects the stock solution supply hole of the filter press and the filter chamber is provided in a portion following the stock solution introduction hole 2. A filter cloth for a filter press with a fixed filter cloth, characterized in that a non-water passage portion 4 is formed opposite to the filter cloth. 2. A filter cloth for a fixed filter press according to claim 1, wherein the stock solution introduction hole 2 is provided with radial notches 3 on its edge.