JPH08266815A - Filter medium transfer device in moving filter bed type filter - Google Patents

Abstract

PURPOSE: To provide a device in which a filter medium is washed and circulated by a small-sized driver in a moving filter bed type filter using a granular filter medium such as sand. CONSTITUTION: In an upflow type moving filter bed filter, a filter tank 1 is loaded with a granular filter medium 2 heavier than water. A lift pipe 3 for conveying the filter medium is vertically installed in the central part of the filter tank 1, and the lower end of the lift pipe 3 is opened to the lower part of an outer air chamber 5 which is installed in the depths of the filter medium bed and whose lower surface is opened, and the outer air chamber 5 is connected to a pressure air source outside the filter tank. On the other hand, in the outer air chamber 5, an inner air chamber 7 whose upper end communicates with the outer air chamber 5 and whose bottom part communicates with the filter tank 1 below the lift pipe 3 is installed. Besides, below the lower end opening of the lift pipe 3, a spindle 8 for controlling the opening/closing of the opening of the lift pipe 3 is installed. When the level in the inner and the outer air chambers is lowered, air in the lift pipe 3 rises. At this time, the stained filter medium is conveyed to remove and wash the stain.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a filter medium transfer device in a moving filter type filter using a granular filter medium which is heavier than water such as sand.

[0002]

2. Description of the Related Art Conventionally, as a filter medium transfer device of this type, the invention of Japanese Patent Publication No. 48-21551 and the Japanese Patent Publication No. 53-42146 of Sho.
There is a number invention. All of these are moving filter type filtration devices for washing, recycling and circulating the filter medium.
In the invention of No. 551, pressure water is used to transfer the clogged filter medium, and in the invention of Japanese Examined Patent Publication No. 53-42146, pressure air is used.

[0003]

[Problems to be Solved by the Invention]
In the invention of 8-21551, a pump is used to transfer the filter medium, and this pump must be a high-pressure pump in order to transfer the contaminated filter medium at the bottom of the filter tank to the upper part of the filter tank, Also, a large amount of washing water is required.

In Japanese Patent Publication No. 48-21551, a general air lift is used to transfer the filter medium, and the air used for this air lift is to transfer the filter medium against the high pressure at the bottom of the filter tank. Must be high pressure air. However, in this kind of moving filter bed filter, the amount of filter medium to be transferred is not large, and the amount of air is small at the time of stable operation, but it still requires a large amount of air at high pressure at startup. Therefore, eventually, it is inevitable to use a compressor that can obtain a large amount of air at high pressure.

Further, both of the above-mentioned devices according to the present invention, when the filter medium is not properly drawn out, that is, when the inlet of the lift pipe is clogged, the filter medium must be discharged and removed in order to treat it. There is also a management problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the conventional apparatus. The gist of the present invention is that the filter tank is loaded with granular filter media heavier than water. In a countercurrent moving filter bed, a washing tower in which a lift pipe for transporting the filter medium is erected in the center of the filtration tank, the upper end of the lift pipe is partitioned from the filtration tank, and the lower portion is in communication with the filtration tank. The lower end of the lift pipe is opened at the lower end of the outer air chamber with the lower surface provided at the deep part of the filter medium layer, and the upper part of this outer air chamber is connected to the pressure air source outside the filtration tank. On the other hand, in the outer air chamber, the upper end thereof communicates with the outer air chamber, the bottom portion thereof is located at the lower end edge portion of the outer air chamber, and the lower end opening of the lift pipe is provided in the filtration tank. An internal air chamber that communicates with the lift pipe is installed below the lower opening of the lift pipe. It is provided with a spindle which can be opened and closed regulating the lower end opening of the bets tube.

[0007]

The apparatus according to the present invention is configured as described above. When high pressure air is fed into the outside air chamber while supplying raw water from the bottom to the filtration tank, the raw water rises in the filter medium layer. The impurities are captured, and filtered water can be obtained above the filter medium layer.

At the same time, the high pressure air sent into the outer air chamber pushes down the water surfaces of the outer air chamber and the inner air chamber. Then, when the water surface is pushed down to the lower end opening of the lift pipe, the air accumulated in the air chamber rises in the lift pipe.

The filter medium below the lift pipe rides on this rising air together with the raw water. Then, as the filter medium is disturbed while rising, the contaminants attached to the filter medium are separated, and in the washing tower at the upper end of the lift pipe, the heavy filter medium settles and the light contaminants float and are taken out of the system. You can
Then, the settled filter medium is rinsed by the filtrate rising from the filter tank and drops onto the surface of the filter medium layer to form a regenerated filter tank.

On the other hand, the inside and outside air chambers in which the internal air has risen to become empty are filled with the undiluted liquid instead of the air, but the high pressure air which is continuously sent gradually pushes down the water surface again. Then, the operation as described above is repeated. That is, the device according to the present invention can intermittently wash and regenerate the filter medium.

Further, the spindle provided below the lift pipe can adjust the opening degree of the lower end of the lift pipe by moving the spindle up and down to adjust the amount of lift air from the air chamber to wash the filter medium. The condition can be adjusted. In addition, when the filter material around the lower part of the lift pipe is severely clogged and it becomes difficult to operate, by closing the lower opening of the lift pipe, it is possible to agitate the clogged part by the high pressure air in the air chamber. It can be set to a different driving state. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a filtration tank, 2 is a filter medium filled in the filtration tank, 3 is a lift pipe erected in the center of the filtration tank 1, and the upper end thereof is filtered above the filtration tank 1. It is opened in the washing tower 4 which is provided separately from the tank 1. The washing tower 4
The bottom portion is connected to the filtration tank 1 around the lift pipe 3, and a drain pipe 4a having a step h with respect to the water level of the filtration tank 1 is led out of the filtration tank 1.

On the other hand, the lower end portion of the lift pipe 3 is inserted into an outer air chamber 5 having an opened lower surface provided at the bottom of the filtration tank 1, and the lower end thereof is hung down to near the lower edge of the outer air chamber 5. . The outer air chamber 5 is connected to a compressor 6 provided outside the filtration tank 1, and an inner air chamber 7 is provided inside the compressor.

The inner air chamber 7 has an upper surface opened so as to communicate with the outer air chamber 5, and the lower surface is made to substantially coincide with the lower edge of the outer air chamber 5, and further to the lower end opening of the lift pipe 3. The filtration layer 1 is communicated with the opposing portions. A spindle 8 is provided below the communicating portion so as to be vertically adjustable so that the degree of opening of the communicating portion between the lower end opening of the lift pipe 3 and the inner air chamber 7 can be adjusted.
In FIG. 1, reference numeral 9 is a raw water supply pipe, 10 is a raw water diversion plate, and 11 is a washed filter distribution plate.

The apparatus according to the present invention is constructed as described above, and the raw water supplied to the filtration tank 1 is trapped in the impurities while rising in the filter medium layer, and is filtered above the filter medium layer. A liquid can be obtained, and the filtrate is taken out of the system from the upper part of the filtration tank 1.

When the filtration operation as described above is performed, the filter material layer is clogged from the lower layer, but by sending high-pressure air to the outside air chamber 5 at the same time as the start of the above-described filtration operation, the outside air chamber 5 and the inside The water surface of the air chamber 7 is gradually pushed down.

When the water surface is pushed down to the lower end opening of the lift pipe 3, the high-pressure air filled in the inside and outside air chambers 5 and 7 flows into the lift pipe 3 and rises. At this time,
The dirty filter medium 2 below the lift pipe 3 is conveyed upward together with the raw water, and the raw water invades the air chambers 5 and 7 inside and outside instead of the air.

As described above, the filter medium 2 rising in the lift pipe is pushed up at once by the high-pressure air in the inner and outer air chambers 5 and 7, so that the contaminants contacting and adhering to each other in the turbulent flow state are attached. It is peeled off. Then, at the upper end of the lift pipe 3, the heavy filter medium 2 settles, and the light contaminants float in the washing tower 4 and are taken out of the system via the drain pipe 4a.

The filter medium 2 settled as described above
Is rinsed by the ascending filtrate during the settling process and falls on the upper surface of the filter medium layer through the distribution plate 11 to form a regenerated filter medium layer.

That is, the filter medium 2 with the clogging at the bottom of the filtration tank 1 is pulled out and conveyed upward, washed during this conveyance and dropped onto the upper surface of the filter medium layer, and a regenerated filter medium layer can be formed. The circulation of the filter medium 2 is performed intermittently every time the inner and outer air chambers 5 and 7 are filled with high pressure air.

In the cleaning and regenerating operation of the filter medium 2 as described above, in the present invention, the spindle 8 provided below the lift pipe 3 can adjust the gap between the inner air chamber 7 and the lift pipe 3, so that the gap is narrowed. As a result, the air can be raised slowly and largely by opening it greatly, and the gap can be set according to the degree of clogging of the filter medium 2.

Further, the spindle 8 closes the lower end of the lift pipe 3 when the filter medium 2 near the lower part of the lift pipe 3 is clogged and solidified, and the air chambers 5 and 7 inside and outside the lift pipe 3 are closed. It is possible to blow out the high-pressure air that has accumulated on the filter medium 2 at once to the solidified portion of the filter medium 2 and agitate and decompose the filter medium 2 in that region to eliminate clogging.

[0023]

As described above, the apparatus according to the present invention requires only a small capacity of the high-pressure air compressor for moving the filter medium in the moving filter type filter, and is used for rinsing the filtrate and the filter medium. Since the filtration rate is high, the filtration rate is high, and efficient filtration operation can be performed.In addition, when the filter medium was clogged and solidified during operation, the operation was stopped and the filter medium was taken out. By operating the spindle under the lift pipe, it is possible to easily return to normal operation from the outside, and it is possible to solve all the problems of the conventional filter of this kind.

[Brief description of drawings]

FIG. 1 is a schematic longitudinal sectional view of a moving filter type filter according to the present invention.

[Explanation of symbols]

 1 Filter Tank 2 Filter Material 3 Lift Pipe 4 Washing Tower 5 Outside Air Chamber 7 Inner Air Chamber 8 Spindle

Claims (1)

[Claims] 1. An upflow type moving filter bed machine in which a granular filter medium 2 which is heavier than water is loaded in the filter chamber 1,
A lift pipe 3 for transporting a filter medium is erected at the center of the filter pipe, and the upper end of the lift pipe 3 is partitioned from the filtration tank 1 and the lower portion is opened in a washing tower 4 communicating with the filtration tank 1, and the lift is lifted. Tube 3
The lower end of the outer air chamber 5 having a lower surface provided at a deep portion of the filter medium layer, and the upper part of the outer air chamber 5 is connected to a pressure air source outside the filtration tank, while Inside the air chamber 5, its upper end communicates with the outside air chamber 5, its bottom is located at the lower end edge of the outside air chamber 5, and below the lower end opening of the lift pipe 3 to the filtration tank 1. A filter medium transfer device in a moving filter apparatus comprising an internal air chamber 7 communicating with the lift pipe 3, and a spindle 8 below the lower end opening of the lift pipe 3 for adjusting the opening and closing of the lower end of the lift pipe 3. .