JP3760874B2 - Continuous pressure filter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for filtering raw water such as purified water, sewage, industrial water, or industrial wastewater, and filtering and concentrating sludge generated by these treatments, and in particular, continuous processing that enables regeneration of the filter medium while performing continuous filtration. It relates to a pressure filter.
[0002]
[Prior art]
Conventionally, as a sealed filtration device, there are devices such as a candle type filter and a leaf filter. In addition, a pressure filtration device in which a large number of cylindrical filter media are suspended in a sealed filtration tank is well known, and a donut-shaped filter media is suspended between a cylindrical filter medium and this cylindrical filter medium in a sealed filtration chamber. A multi-cylindrical filter provided with a scraper that is in sliding contact with the filter medium is known, for example, as described in Japanese Patent Publication No. 7-30095.
[0003]
[Problems to be solved by the invention]
The apparatus such as the candle type filter and the leaf filter described above is a batch type, so the filtration rate is low and the target stock solution is limited. In addition, the conventional multi-cylindrical filter is capable of continuous filtration, has a high filtration rate, and has a feature that enables large-capacity processing, but it prevents clogging of the filtration surface and reduction of filtration capacity due to changes over time. However, it is difficult with a scraper. Even if cleaning water is supplied from the filtrate outlet, the entire filter medium may not be cleaned by a short pass. In order to solve the above-mentioned problems, the present invention provides a continuous pressure filter capable of regenerating the filter medium surface by washing the filter medium surface partitioned by the partition wall for each block while performing continuous filtration. For the purpose.
[0004]
[Means for Solving the Problems]
The gist of the present invention is that a filtration cylinder is suspended in a cylindrical sealed tank, the stock solution is press-fitted into the sealed tank to form a cake layer on the circumferential surface of the filtration cylinder, and the filtrate is placed inside the filtration cylinder. In a filtration apparatus that performs solid-liquid separation by passing through, the base ends of a plurality of cleaning pipes suspended in a filter cylinder are connected to a plurality of communication pipes formed in the fixed valve, and are brought into sliding contact with the fixed valve. A supply pipe is provided on the rotary valve, a washing water pipe is connected to the supply pipe, and a plurality of communication pipes drilled in the fixed valve are provided to face the rotation trajectory of the supply pipe provided on the rotary valve. The washing water pipe can be joined and disengaged freely with the washing pipe suspended from the filtration cylinder. The backwash zone and filtration zone of the filtration cylinder are switched between the rotary valve and the fixed valve, and the filtration cylinder is backwashed intermittently. The filter medium surface is regenerated to enable continuous filtration.
[0005]
Specifically, a partition wall that divides the sealed tank into upper and lower filtrate chambers and a stock solution chamber is provided, and the filter cylinder is suspended on the partition wall as a concentric annular filter cylinder with the sealed tank. A partition is divided into a plurality of partition walls, and a washing tube is suspended in each compartment of the annular filter cylinder, allowing continuous filtration of the annular filter cylinder while washing the compartment partitioned by the partition wall for each block. Become. A plurality of scrapers slidably contacted with the circumferential surface of an annular filtration tube concentric with the closed tank are erected on a support rod, and a driven shaft connected to the center portion of the support rod is linked to a scraper driving machine to connect the scraper. Is made to revolve while being slidably contacted with the circumferential surface of the annular filter cylinder, so that the filter medium surface can be prevented from being blocked by the cake layer and the filtration capacity can be reduced, and a synergistic effect with washing can be obtained.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The continuous pressure filter according to the present invention is configured as described above, and the stock solution is press-fitted into the stock solution chamber of the closed tank, and the solid content is captured on the filtration surface of the annular filter tube. A cake layer is formed on the surface. The filtrate from which the solid content has been separated flows into the annular filter cylinder due to the differential pressure, and is transferred to the filtrate chamber above the partition wall. The scraper scrapes the cake layer formed on the annular filter cylinder while revolving the peripheral surface of the annular filter cylinder, and prevents the reduction of the filtration capacity due to the blockage of the filter medium surface. A rotary valve connected to the cleaning pipe is slidably brought into sliding contact with the fixed valve, and air or cleaning water is intermittently injected from the communication pipe into each compartment of the annular filter cylinder, and backwashing is performed from the back side of the filter medium. Each compartment partitioned by the partition wall of the annular filter cylinder can be divided into a filtration zone and a backwash zone to be washed block by block. The filter medium surface of the annular filter cylinder is washed to enable continuous operation. The cake scraped and precipitated by the scraper is intermittently discharged from the closed tank.
[0007]
【Example】
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to an embodiment. FIG. 1 shows a continuous pressure filter, which is provided with a partition wall 4 that divides a cylindrical sealed tank 1 into an upper filtrate chamber 2 and a lower stock chamber 3. The filtration cylinder 5 is suspended from the partition wall 4, and the inside of the filtration cylinder 5 communicates with the filtrate chamber 2 of the sealed tank 1. A stock solution supply pipe 6 is connected to the side wall of the closed tank 1 of the stock solution chamber 3, and a filtrate pipe 7 is connected to the side wall of the closed tank 1 of the filtrate chamber 2. The lower part of the sealed tank 1 is formed in a conical shape to form a sedimentation chamber 8, and a sludge pipe 10 is connected to the lower end of the sedimentation chamber 8 via an on-off valve 9. FIG. 2 is a cross-sectional view of the closed tank. The filter cylinder 5 is an annular filter cylinder 5 a concentric with the closed tank 1, and the annular filter cylinder 5 a is disposed in the closed tank 1 in a double manner. . A compartment 12 is formed by partitioning the circular filter cylinder 5a by a plurality of partition walls 11. As shown in FIGS. 1 and 3, a washing tube 13 is suspended in a compartment 12 of an annular filtration cylinder 5a, and washing water or compressed air is supplied to the inside of a filter medium stretched on the annular filtration cylinder 5a. The spray nozzles 13a to be sprayed are provided.
[0008]
FIG. 4 shows a filter medium cleaning switching device, in which the base end portion of the cleaning pipe 13... Hanging from the compartment 12 of the annular filter cylinder 5 a is a communication pipe 15 of a fixed valve 14 provided near the top of the sealed tank 1. ... are connected to each other. A rotary valve 17 supported on a bearing 16 at the top of the hermetic tank 1 is in sliding contact with the fixed valve 14, and a chain 19 wound around a sprocket 18 fitted to the upper part of the rotary valve 17 is linked to the rotary valve drive machine 20. It is. The upper end of the supply pipe 21 disposed on the rotary valve 17 is opened at the center of the rotary valve 17, and is connected to a cleaning water pipe 23 for supplying cleaning water via a rotary joint 22. As shown in FIG. 5, the lower end of the supply pipe 21 disposed on the rotary valve 17 is opened eccentrically from the center of the rotary valve 17, and is opposed to the turning trajectory of the supply pipe 21 opened by the rotary valve 17. As shown in FIG. 6, a large number of communication pipes 15 formed in the fixed valve 14 are arranged on a concentric circumferential surface.
[0009]
While rotating the rotary valve 17 by driving the rotary valve driver 20 every predetermined time, the supply pipes 21 of the rotary valve 17 shown in FIG. 5 are arranged on the concentric circumferential surface of the fixed valve 14 shown in FIG. Wash water or compressed air is supplied from the wash water pipe 23 to the wash pipes 13 that are sequentially joined to the communication pipes 15 and are suspended in the compartments 12 of the annular filter cylinder 5a. The compartments 12 of the annular filter cylinder 5a are switched to the filtration zone A and the backwash zone B, and the plurality of compartments 12 are divided and washed for each block while performing continuous filtration in the annular filter cylinder 5a. The filter surface of the annular filter cylinder 5a is regenerated. Reference numeral 24 denotes a holding cover for the rotary valve 17, and reference numeral 25 denotes a holding spring for the rotary valve 17 disposed on the holding cover 24.
[0010]
As shown in FIGS. 1 and 7, a plurality of scrapers 26 slidably contacted with the circumferential surface of the annular filter cylinder 5 a are erected on a support rod 27. A driven shaft 28 connected to the central portion of the support rod 27 is pivotally supported by a rib 29 fixed to the lower inner peripheral wall of the sealed tank 1, and the lower end of the driven shaft 28 is inserted into the gear box 30. A drive shaft 32 of the scraper drive 31 passes through the sealed tank 1 and is inserted into the gear box 30, and a drive gear 33 of the drive shaft 32 and a driven gear 34 of the driven shaft 28 mesh with each other inside the gear box 30. is there. Drive the scraper drive 31, and revolve on the filtration surface while scraping the cake layer captured on the filter medium surface of the annular filtration cylinder 5a scraper 26 slidably contacted with the circumferential surface of the annular filtration cylinder 5a, Prevents clogging of filter media surface and reduction of filtration capacity. The scraped cake is allowed to settle in the settling chamber 8 and is discharged from the mud pipe 10 by opening the on-off valve 9 as concentrated sludge as needed. This continuous pressure filter can be filtered in batch operation according to the purpose of use.
[0011]
【The invention's effect】
The continuous pressure filter according to the present invention is configured as described above, and a plurality of cleaning pipes suspended in the inside of the filter cylinder are connected to a fixed valve, and the cleaning pipe is connected to a rotary valve that is in sliding contact with the fixed valve. The washing water pipe is joined to and dissociated from the washing pipe suspended from the filtration cylinder, and the filtration cylinder is switched by switching the backwash zone and filtration zone of the filtration cylinder with a rotary valve that slides on the fixed valve. The filter surface can be regenerated by intermittent backwashing. The filtration cylinder installed in the sealed tank is an annular filtration cylinder that is concentric with the sealed tank, and a washing tube is suspended in a compartment partitioned by a partition wall. On the other hand, continuous filtration of the annular filter cylinder becomes possible. A plurality of scrapers slidably contacted with the circumferential surface of the annular filter cylinder are revolved while being slidably contacted with the circumferential surface of the annular filter cylinder. Can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a continuous pressure filter according to the present invention.
2 is a cross-sectional view of the continuous pressure filter cut along the line AA in FIG. 1. FIG.
FIG. 3 is an enlarged view of a washing tube suspended in a compartment of an annular filter cylinder.
FIG. 4 is also an enlarged view of a switching device for cleaning water supplied to the cleaning pipe.
FIG. 5 is also a bottom view of a supply pipe disposed on the rotary valve.
FIG. 6 is also a plan view showing an arrangement state of communication pipes in which a fixed valve is bored.
FIG. 7 is an enlarged view of the scraper driving device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sealed tank 2 Filtrate chamber 3 Stock solution chamber 4 Partition wall 5 Filter cylinder 5a Ring filter cylinder 11 Partition 12 Compartment 13 Wash pipe 14 Fixed valve 15 Communication pipe 17 Rotary valve 21 Supply pipe 23 Wash water pipe 26 Scraper 27 Support rod 28 Follower shaft 31 Scraper drive machine

Claims (3)

The filter cylinder (5) is suspended from the cylindrical closed tank (1), the stock solution is pressed into the closed tank (1) to form a cake layer on the peripheral surface of the filter cylinder (5), and the filter cylinder (5) In the filtration device that allows the filtrate to pass through the inside of the filter tube, the base end portions of a plurality of washing pipes (13) suspended in the filter cylinder (5) are formed in the fixed valve (14). A supply pipe (21) is arranged on a rotary valve (17) connected to a plurality of communication pipes (15) and slidably contacted with a fixed valve (14), and a washing water pipe (23) is connected to the supply pipe (21). And connecting the communication pipe (15...) Drilled in the fixed valve (14) to the rotation trajectory of the supply pipe (21) arranged in the rotary valve (17), so that the filtration cylinder (5). A continuous pressure filter characterized in that the washing water pipe (23) can be joined and disengaged freely to the washing pipe (13) suspended from the pipe. A partition wall (4) is provided for partitioning the closed tank (1) into upper and lower filtrate chambers (2) and a stock solution chamber (3), and the filter cylinder (5) is concentric with the closed tank (1). The cylinder (5a) is suspended from the partition wall (4), and the annular filter cylinder (5a) is partitioned by a plurality of partition walls (11) and washed in the respective compartments (12) of the annular filter cylinder (5a). 2. The continuous pressure filter according to claim 1, wherein the pipe (13) is suspended. A plurality of scrapers (26) slidably contacted with the peripheral surface of the annular filtration cylinder (5a) concentric with the closed tank (1) are erected on the support rod (27), and the center portion of the support rod (27) The driven shaft (28) connected to the shaft is interlocked and connected to a scraper driving machine (31), and the scraper (26) is revolved while being in sliding contact with the circumferential surface of the annular filter cylinder (5a). 2. The continuous pressure filter according to 2.

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