JPH052711U - Rotating drum type precoat filter - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the expansion amount of the sludge layer when decompressing the stock solution tank to increase the thickness of the sludge scraped off at one time. [Structure] In a rotary drum type precoat filter of a system in which sludge is expanded by rapidly lowering the internal pressure of the stock solution tank 1 and scraped by a scraping plate 7 arranged on the side of the filtration drum 2, liquid permeability Filter drum 2 in which an outer cylinder 5 made of a porous material having elasticity is wound around the outer circumference of the supporting inner cylinder 4
To use. [Effect] Not only the sludge layer but also the filtration drum can be expanded, and the sludge thickness to be scraped off can be increased.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention pre-coats the stock solution containing sludge such as grinding solution on the surface of the filtration drum. The present invention relates to a rotary drum type precoat filter which filters by layers.

[0002]

[Prior art]

  The rotating drum type precoat filter is a filter material supported by a drum type support material. While rotating the filtration drum with the precoat layer directly formed on the surface in the stock solution tank, Is filtered and the filtrate is discharged from the filtrate discharge port of the filter drum. And With a scraping plate with a sharf edge installed on the side of the filtration drum, the filtration drum It is designed to scrape off the sludge that has accumulated on the surface.

[0003]   However, if the sludge particles are fine, the sludge is hard on the surface of the filtration drum. It may stick and may not be easily scraped. Therefore, the applicant is By rapidly reducing the internal pressure of the stock solution tank when sludge accumulates The sludge is expanded and sludge is expanded by a scraping plate located on the side of the filtration drum. Developed a rotary drum type precoat filter that scrapes off the oil, and has already applied for patent application 3-4. I have just filed as No. 4249.

[0004]   However, in the rotating drum type precoat filter of this earlier application, the filter drum is punched. Since it was made of a rigid material such as gumetal, depending on the thickness of the sludge layer Sometimes had insufficient swelling. For this reason, it is possible to scrape with a single scraping operation. The thickness of sludge that can be removed is limited, and the number of scrapings performed after stopping filtration is large. There was a problem that the filtration time became short.

[0005]

[Problems to be solved by the device]

  The present invention solves the above-mentioned conventional problems and makes a single scraping operation. Increase the sludge layer thickness that can be reduced to reduce the number of sludge scrapes To provide a rotating drum type precoat filter that can lengthen the filtration time. It was completed for the purpose.

[0006]

[Means for Solving the Problems]

  The present invention, which has been made to solve the above problems, has a problem that sludge is accumulated on the filtration drum. When this happens, the sludge is expanded by rapidly reducing the internal pressure of the stock solution tank. , A rotary drum type scouring system that uses a scraping plate placed on the side of the filtration drum. Filter, which has elasticity around the outer periphery of the liquid-permeable supporting inner cylinder It is characterized in that an outer cylinder made of a porous material is wound.

[0007]

【Example】

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.   In FIGS. 1 and 2, reference numeral 1 denotes a cylindrical stock solution tank. A table-type rotatable filter drum 2 is provided. The filtering drum 2 has a large number of through holes. 3 made of a porous material having elasticity around the outer periphery of the liquid-permeable supporting inner cylinder 4 A cylinder 5 is wound, and a filtrate discharge port 6 is formed at the center of one side thereof. It   The supporting inner cylinder 4 is made of stainless steel having a large number of through holes 3 or a large number of through holes 3. Strength as structural material such as formed fiber reinforced plastic and porous ceramics The material is not limited as long as it is liquid-permeable. The outer cylinder 5 is made of felt, porous rubber, sponge rubber, or the like having sufficient elasticity. It shall consist of materials.

[0008]   Inside the stock solution tank 1, a scraping plate 7 adjacent to the filtration drum 2 is provided. Reference numeral 7 shows the sludge deposited on the surface of the filtration drum 2 and scraped together with the precoat. It is to be dropped into the ludge reservoir 8. 9 is a sludge formed at the lower end of the sludge reservoir 8. The ink discharge port 10 is a precoat liquid supply port.

[0009]

[Action]   In the case of such a constitution, first, the precoat liquid is supplied from the precoat liquid supply port 10. Liquid is supplied to form a precoat layer on the surface of the outer cylinder 5 having elasticity of the filtration drum 2. It If the stock solution is supplied into the stock solution tank 1 after the precoat layer is formed, the stock solution is filtered. Filtered by the precoat layer of Ram 2. Then, the filtrate in the filtration drum 2 is filtered. It is discharged to the outside from the filtrate discharge port 6 provided at the center of one side of the excess drum 2. Become. In this way, the filtration is performed and the sludge adheres to the precoat layer of the filtration drum 2. Then, when the filtration resistance becomes high, the supply of the undiluted solution to the undiluted solution tank 1 is stopped, and the undiluted solution tank 1 The pressure inside is rapidly reduced.

[0010]   As a result, the pressure inside the filtration drum 2 becomes relatively higher than the pressure outside, and The outer cylinder 5 made of a porous material having elasticity wound around the support 4 of the overdrum 2 has a pressure. It expands due to the force difference. At the same time, the sludge layer expands, Sludge will be scraped off by the scraping plate 7 from the surface of the filtering drum 2 present. It The sludge scraped off by the scraping plate 7 in this way falls into the sludge reservoir 8. After that, the sludge is discharged from the sludge discharge port 9.

[0011]   In addition, FIG. 3 shows another embodiment of the outer cylinder 5 having elasticity. The outer cylinder 5 is formed on the support 4 in one layer or a plurality of layers. The filter drum 2 is wound and wound. The felt thickness is, for example, 1.4 mm to 3 mm. The brushed part is 30 to 60% of the felt thickness. This felt in multiple layers When the stock solution is wound, the expansion rate of the outer cylinder 5 becomes large when the stock solution tank 1 is depressurized, and the scratch plate 7 is scratched. It is preferable because it increases the amount taken, but if it is wound in too many layers, filtration resistance will increase. Therefore, if the length of the filter drum 2 is set to 300 mm, 3 mm thick felt is wrapped twice. What was best was. In addition, the brushed surface (5a) of the felt is the outer side Although it may be wound as a wrap, the amount of elastic deformation at the time of decompression becomes larger when the wrap is wound inside. The effect of scraping off the recoat layer is great.

[0012]   FIG. 4 shows another embodiment of the support inner cylinder 4 of the filtration drum 2, in which the central portion is It has a drum-like shape with a smaller diameter than both sides. In this way, the central part has a small diameter By further increasing the expansion amount of the elastic outer cylinder 5 when the pressure is reduced Is something that can be done. For example, the filter material 5 is a porous rubber having a thickness of 5 mm, and the length of the support 4 is When the outer diameter of the central part is 298 mm, when the outer diameter of both sides is 300 mm Moreover, the peeling effect of the precoat layer was the highest.

[0013]

[Effect of device]

  As will be apparent from the above description, the present invention relates to a liquid-permeable supporting inner cylinder of a filtration drum. The outer cylinder made of a porous material with elasticity is wound to reduce the pressure. At times, not only the sludge layer but also the filtration drum itself can be expanded, The amount of scraping by the plate can be increased. This results in a filtration cycle. Thus, the filtration time becomes longer and the filtration efficiency can be improved.   In addition, by using a felt with a raised surface on one side as in the example, It is possible to increase the amount of expansion of the filter medium during depressurization and increase the amount of scraping of the precoat layer. The filtration time can be further extended. Furthermore, filtration as in other embodiments If the diameter of the central portion of the drum support is smaller than that on both sides, more favorable results are obtained. be able to.   Therefore, the present invention is a rotary drum type precoat filter that eliminates the conventional problems. Practical value is extremely large.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of a filtration drum.

FIG. 3 is a perspective view showing another embodiment.

FIG. 4 is a partially cutaway perspective view showing still another embodiment.

[Explanation of symbols]

1 stock solution tank 2 Filter drum 4 Support inner cylinder 5 outer cylinder 6 Filtrate outlet 7 Scratch plate

Claims (3)

[Scope of utility model registration request] 1. When sludge is accumulated on the filtration drum (2), the sludge is expanded by rapidly lowering the internal pressure of the stock solution tank (1), and the sludge disposed on the side of the filtration drum (2) is expanded. A rotary drum type precoat filter scraped by a plate (7), wherein the filter drum (2) is an outer cylinder made of a porous material having elasticity around the liquid-permeable supporting inner cylinder (4).
A rotating drum type precoat filter characterized in that (5) is wound. 2. The rotary drum type precoat filter according to claim 1, wherein the outer cylinder (5) of the filtration drum (2) is made of felt with one surface being a raised surface (5a). 3. A liquid-permeable support tube (4) for a filtration drum (2).
The rotary drum type precoat filter according to claim 1, wherein the center portion is formed in a drum shape having a smaller diameter than both side portions.