JPH0576522U - Filtration device using membrane - Google Patents

Abstract

(57) [Summary] [Objective] A filter device using an ultrafiltration membrane, which can be easily washed and regenerated without damaging the filtration membrane, is proposed. [Configuration] When a filter plate having an ultrafiltration membrane stretched on at least one surface thereof and a filter plate having a protective sheet made of a metal mesh or the like stretched on at least one surface thereof are alternately arranged in parallel on a horizontal rod and closed. A filter chamber is formed between them so that each filter chamber is opened when the plate is opened, and when each filter plate is closed, the filter membrane and the protective sheet are brought close to each other in each filter chamber. Is. When the filtration membrane becomes clogged, the surface of the filtration membrane can be washed by injecting the washing liquid into the filtration chamber with each filter plate closed, and by sending the washing liquid to the back surface of the filtration membrane, filtration can be performed. The membrane can be backwashed. At this time, the protective sheet does not expand and damage the filtration membrane. Also,
By opening the filter plate, the cleaning liquid can be directly sprayed onto the filtration membrane for cleaning.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a filtration device using a thin filtration membrane such as an ultrafiltration membrane.

[0002]

[Prior Art]

 Conventionally, a filtration device using a thin filtration membrane such as an ultrafiltration membrane is well known. The invention of Japanese Patent Publication No. 3-55173 is one such example. In this invention, a large number of filter plates having filtration membranes on both sides are arranged in parallel at regular intervals, and the stock solution to be filtered is placed between these filter plates. It is made to flow and the filtrate is taken out.

[0003]

[Problems to be solved by the device]

 In the conventional device described above, in order to prevent the clogging of the filtration membrane, it is common to flush the clogging substances by flowing the stock solution along the surface of the filtration membrane. The contaminants entered cannot be removed and if the filtration membrane is clogged to a certain extent, it must be disassembled and washed, or the filtration membrane must be replaced.

[0004]

[Means for Solving the Problems]

 This invention can solve the above-mentioned problems, and its gist is to provide a filter plate having filter membranes stretched on both sides thereof and a filter membrane protective sheet stretched on both sides thereof. The intermediate plates and the intermediate plates are alternately juxtaposed on the guide rods so that the filter plates and the intermediate plates are connected to each other to open and close at the same time, and when these filter plates and the intermediate plates are closed, An undiluted solution supply path communicating with the filtration chamber formed between the filter plate and the intermediate plate and an outlet path for the concentrated undiluted solution are provided. The filtration passage on the back side of the membrane is provided with an outlet for the filtrate.

[0005]

[Action]

 The device according to the present invention is configured as described above, and by closing each filter plate and the intermediate plate, one surface is a filtration membrane and the other surface is a protective sheet between them. A filtration chamber can be formed. Therefore, the undiluted solution supplied to this filtration chamber is filtered by the filtration membrane, and the filtrate can be taken out of the machine through the filter bed through the outlet of the filter plate, while the filtrate is separated and concentrated. The undiluted solution can be taken out of the machine from the outlets of the filter plate and the intermediate plate.

Then, when the filtration membrane is clogged by continuing the filtration operation as described above, the cleaning membrane surface can be washed and regenerated by sending the washing liquid from the feed passage of the stock solution. For such contaminants that cannot be removed by such washing, the cleaning liquid is sent from the filtration bed side to push out the contaminants from the back side to remove them. be able to. That is, the filtration membrane can be washed from both the front and back sides, and can be completely backwashed to completely eliminate the clogging. Then, during the above-mentioned backwashing, the high pressure of the backwashing liquid is applied to the filtration membrane.In this invention, since the protective sheet is provided close to the front surface of the filtration membrane, the filtration membrane does not expand. It is not likely to be damaged.

Further, in the device according to the present invention, since the filtration chamber is opened by opening the filter plate and the intermediate plate, it is possible to directly inject the high-pressure cleaning liquid onto the filtration membrane and the protective sheet, and therefore It is also possible to remove the foreign matters that are clogged in. The present invention will be specifically described below with reference to the drawings.

[0008]

【Example】

 FIG. 1 is a side view of a filtration device according to the present invention, in which reference numeral 1 is a frame in which a guide rail 2 is bridged, 3 is a filter plate movably mounted on a guide rail 2, 4 Is also an intermediate plate movably mounted on the guide rail 2, and these are alternately arranged in parallel on the guide rail 2 and connected to each other by a link chain 5. 6 is a movable head, and 7 is a hydraulic cylinder connected to the movable head for opening and closing the filter plate 3 and the intermediate plate 4 and simultaneously tightening them. Further, reference numeral 8 is a stock solution tank, 9 is a pump for supplying the stock solution, 10 is a pipe for taking out the filtrate, and 11 is a filtrate tank.

Next, the configuration of the filtration chamber portion formed by the filter plate 3 and the intermediate plate 4 will be described with reference to FIGS. 2 and 3. In FIG. 2, reference numeral 12 is a filtration membrane mounted on the filtration bed 3a of the filter plate 3 and stretched on a liquid-permeable support material. Reference numeral 13 denotes a protective sheet stretched in the recess of the intermediate plate 4, which is made of a metal mesh and is attached to the intermediate plate 4 so as to face the filtration membrane 12. Reference numeral 14 is a filtration chamber composed of the filtration membrane 12 and the protective sheet 13. The filtration chamber 14 is connected to a feed passage for the stock solution and a take-out passage for the concentrated liquid.

That is, in FIG. 2, reference numeral 3 b is a stock solution supply path provided on the filter plate 3, 4 a is a stock solution supply path provided on the intermediate plate 4, 3 c is a concentrated solution take-out path provided on the filter plate 3, 4 b Is an outlet for the concentrated liquid provided in the intermediate plate 4, and the supply passages 3b, 4a and the outlets 3c, 4b are connected to each other when the plate is closed to form a communication pipe. In FIG. 1, the stock solution supply paths 3b and 4a and the concentrated solution extraction paths 3c and 4b are shown by imaginary lines, and the flow directions thereof are shown by arrows. In the illustrated example, the concentrated solution is returned to the stock solution tank 8. Further, in FIGS. 2 and 3, reference numeral 3d is a filtrate take-out path, one end of which is opened to the filtration bed 3a and the other end of which is connected to the filtrate take-out pipe 10. In Fig. 1, such a symbol is indicated by an arrow (a). In FIG. 3, reference numeral 3e is a stock solution distribution path, 3f is a stock solution distribution groove, 3g is a concentrated solution collection groove, 3h is a concentrated solution collection path, 3j is a filter plate supporting arm, and FIG. In FIG. 4, 4c is a stock solution distribution path, 4d is a stock solution distribution groove, 4f is a concentrated solution collection groove, 4g is a concentrated solution collection path, and 4h is a support arm of the intermediate plate 4.

The device according to the present invention is configured as described above, and when the filter plate 3 and the intermediate plate 4 are closed, as shown in FIG. 2, a filtration chamber 14 is formed between them at the same time. The stock solution supply paths 3b and 4a and the concentrated solution take-out paths 3c and 4b are connected to form a stock solution flow path. Therefore, the undiluted solution sent to the filtration chamber 14 is filtered by the filtration membrane 12, and the filtrate is stored in the filtration tank 11 by the pipe 10 through the filtration bed 3a and the extraction path 3d. On the other hand, the concentrated liquid from which the filtrate has been separated flows back to the stock solution tank 8 through the take-out paths 3c and 4b. That is, the stock solution can be separated into a separated filtrate and a concentrated solution.

When the filtration membrane 12 is clogged in the filtration operation as described above, the filtration membrane 12 can be washed by sending the cleaning liquid to the filtration chamber 14 from the supply passages 3b and 4a. If the filter membrane 12 is clogged with the eyes and cannot be removed by the above-mentioned washing, the filter membrane 12 can be backwashed by sending the washing solution from the filtration bed 3a side, and the clogged contaminants can be obtained. Can be extruded and completely removed. In backwashing the filtration membrane 12, in this invention, since the protective sheet 13 made of metal mesh is provided close to the front surface of the filtration membrane 12, the filtration membrane 12 is expanded by the injection of the backwashing liquid. It will not be damaged by doing so.

The above is the cleaning of the filtration membrane 12 in the state where the filter plate 3 and the intermediate plate 4 are closed. In this invention, the filter chamber 3 is opened by opening the filter plate 3 and the intermediate plate 4. Since 13 is opened, the filtration membrane 12 and the protective sheet 13 can be washed with a high-pressure washing liquid. In this case, even if a high-pressure cleaning liquid is applied to the filtration membrane 12, since the filtration membrane 12 is on the support material, there is no risk of damage or the like.

[0014]

[Effect of the device]

 As described above, according to the device according to the present invention, when the filter membrane is clogged, it can be completely cleaned by cleaning it from the inside and outside without damaging the filter membrane, and the filter plate and the intermediate plate. The filtration chamber can be configured and opened simply by opening and closing, which is convenient for inspection and maintenance compared to the conventional fixed membrane filtration chamber.

[Brief description of drawings]

FIG. 1 is a side view of a filtering device according to the present invention.

FIG. 2 is a vertical sectional side view showing a part of a filter plate and an intermediate plate of the filtering device according to the present invention.

FIG. 3 is a front view of a filter plate of the filtering device according to the present invention.

FIG. 4 is likewise a front view of the intermediate plate.

[Explanation of symbols]

 2 Guide rails 3 Filter plates 3a Filtration beds 3b, 4a Supply paths 3c, 4b Extraction paths 3d Filtrate extraction paths 4 Intermediate plates 12 Filtration membranes 13 Protective sheets 14 Filtration chambers

Claims (1)

[Scope of utility model registration request] 1. A filter plate 3 having filtration membranes 12 stretched on both sides thereof.
And an intermediate plate 4 having protective sheets 13 of the filtration membrane 12 stretched on both sides thereof are alternately arranged in parallel on the guide rod 2.
The intermediate plate 4 and the intermediate plate 4 are connected at the same time so as to be opened and closed. The supply channels 3b and 4a for the concentrated solution and the extraction channels 3c and 4b for the concentrated concentrated solution, which communicate with the filtration chamber 14, are provided on the filter plate 3 on which the filtration membrane 12 is stretched. A filtration device using a membrane provided with a filtrate withdrawal path 3d opening to the side.