JPH08266817A - 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 with a small power in a moving bed type filter using sand or the like. CONSTITUTION: A tank filter 1 is loaded with a filter medium 13 such as sand, and a filter pipe 2 is vertically installed in the central part of the tank filter 1. The lower end of the lift pipe 2 is opened to the lower part of an air chamber 4 installed in the bottom part of a filter medium bed 13a, and the air chamber 4 is made to communicate with a high pressure air source outside the tank filter 1 and a filtrate chamber 1a above the filter medium bed 13a. In the air chamber 4, an inner air chamber 5 which surrounds the lift pipe 2 and whose upper end part communicates with the air chamber 4 and whose bottom part communicates with the tank filter 1 around the lift pipe 2 is formed. Besides, below an opening at the lower end of the lift pipe 2, a spindle 9 for controlling the opening/closing of the opening is attached. By feeding air into the air chamber 4, the filter medium 13 is conveyed upward to perform washing.

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 material transfer device in a moving filter bed type filter.

[0002]

2. Description of the Related Art Conventionally, as a filter material transferring device in a moving filter apparatus of this type, for example, Japanese Patent Publication No. 215-215.
The invention is No. 51 and Japanese Patent Publication No. 53-42146. These are all related to a moving filter type filter device for cleaning, recycling and circulating the filter medium.
In the invention of No. 1, pressured water is used to transfer the clogged filter medium, and in the invention of Japanese Examined Patent Publication No. 53-42146, pressurized air is used.

[0003]

[Problems to be Solved by the Invention]
In the invention of 8-21551, a pump is used to transfer the dirty filter medium, and this pump must be a high pressure pump in order to transfer the filter medium upward against the high pressure at the bottom of the filtration tank. And requires a large amount of wash water. In Japanese Patent Publication No. 53-42146, a general air lift is used, but high-pressure air is required to lift the filter medium at the high-pressure portion of the bottom of the filtration tank, and particularly a large amount of high-pressure air is required at startup. Therefore, more compressors than necessary for normal operation are required.

Further, in any of the above-described devices, if a defective drawing of the filter material occurs during operation, the operation must be stopped and the filter material should be taken out of the tank in order to correct the problem. There are also operational management problems such as failure.

[0005]

The present invention can solve the above-mentioned problems, and the gist of the present invention is to load a granular filter material such as sand into a filter tank, and to filter the filter tank. A lift pipe for transporting the filter medium is erected in the center of the filter, the upper end of the lift pipe is provided in the filtration tank, and the lift pipe is opened in the washing tower connected to the filtration tank around the lift pipe, and the lower end is filtered. The lower part of the air chamber provided at the bottom of the tank is opened, and the upper part of the air chamber is connected to the high-pressure air source outside the filtration tank, and the bottom is connected to the filtrate chamber above the filter medium layer. Is an inner air chamber whose upper end communicates with the air chamber and whose bottom communicates with the filtration tank around the lift pipe, and further below the lower end opening of the lift pipe. A spindle is provided which can adjust the opening and closing of the opening. .

[0006]

The apparatus according to the present invention is configured as described above, and the raw water supplied to the lower portion of the filter medium layer is trapped in the impurities while being trapped in the upper portion of the filter tank while rising in the filter medium layer. A filtrate can be obtained. This filtrate is taken out of the system, while the filter material layer is gradually clogged from the lower layer portion by impurities.

When high-pressure air is supplied to the air chamber during such a filtering operation, the water level of the raw water that has entered the inner air chamber gradually decreases. Then, when the water level still drops and reaches the lower end opening of the lift pipe, it rises in the lift pipe as much as the air in the air chamber.

At the same time, the raw water near the lower end opening of the lift pipe and the filtrate above the filter medium layer flow into the lift pipe through the air chamber and the inner air chamber, and the dirty filter medium below the lift pipe is entrained and washed in the washing tower. Transport to

The filter medium conveyed in the lift pipe is disturbed by the ascending water flow and the high-pressure air rising together therewith, and the clogging substances such as foreign substances adhering to the surface thereof are peeled off. Then, at the portion discharged into the washing tower, the heavy filter medium settles, and the light contaminants float in the washing tower.

Then, the ascending flow of the filtrate from the filtration tank acts on the settling filter medium in opposition to rinsing the filter medium from which contaminants have been separated, and this rinse water and the above-mentioned separated contaminants. Is also taken out of the system from the washing tower.

That is, the filter medium in the lower layer portion of the filter medium layer is washed and separated from the impurities, and then returned to the upper surface of the filter medium layer to form a regenerated filter medium layer.

On the other hand, high-pressure air is continuously sent to the inside and outside air chambers where the air is discharged and the raw water and the filtrate are filled, and the filled water level is pushed down to prepare for the next cleaning and regeneration of the filter medium. Form. That is, the cleaning apparatus for filter media according to the present invention operates intermittently but does not stop operation.

Further, the spindle according to the present invention can adjust the opening degree of the lower portion of the lift pipe by moving the spindle up and down, and the amount and time of transport of the filter medium can be adjusted. Therefore, the most appropriate transport can be performed.

Further, this spindle can blow the high pressure air in the air chamber into the most clogged filter medium layer below the lift tube by closing the lower end opening of the lift tube. It is possible to easily eliminate troubles such as clogging of the filter material at the pulled-out portion, which was difficult to deal with.

Further, the communication pipe connecting the bottom of the air chamber and the filtrate chamber of the filtration tank supplements the washing water for the filter medium and can smoothly withdraw the filter medium. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 is a filtration tank, 2 is a lift pipe erected in the center thereof, and the upper end thereof is opened in a washing tower 3 which is provided separately from the filtration tank 1. Yes,
The lower end thereof penetrates the air chamber 4 provided at the bottom of the filtration tank 1 and is opened at the bottom.

In the air chamber 4, the inner air chamber 5 is concentrically formed.
Is formed, and the inner air chamber 5 and the air chamber 4 are communicated with each other at the upper edge portion of the inner air chamber, and the bottom portion of the inner air chamber 5 is
The lower part of the lift pipe 2 communicates with the filtration tank 1.
Further, the bottom of the air chamber 4 around the outside of the inner air chamber 5 is closed, and the upper end of the bottom is located at the bottom of the filtrate chamber 1a.
The flow-through tube 6 of the filtrate that opens inside is opened, and
An air supply pipe 7 is opened in the ceiling wall 4 a of the air chamber 4.

The above-mentioned washing tower 3 has a lift pipe 2 at the bottom thereof.
And a communication port 3a with the filtrate chamber 1a is formed, and a drainage pipe 3b for washing water is provided at the bottom of the communication port 3a so as to have a head surface difference h from the filtrate surface H. Reference numeral 8 is a distribution plate of the filter medium 13 provided below the communication port 3a.

Reference numeral 9 in the drawing denotes a spindle provided below the lower end opening of the lift pipe 2, which is vertically adjustable, so that the lower end opening of the lift pipe 2 can be adjusted. Reference numeral 10 is a raw water supply pipe, 11 is a raw water distribution pipe, 12 is a raw water distribution plate, 13 is a filter medium, and 13a is a filter medium layer.

The apparatus according to the present invention is configured as described above, and the raw water supplied from the supply pipe 10 is the filter medium layer 1
Contaminants contained during the ascent of 3a are captured, and the filtrate is collected in the upper part of the filtration tank and can be taken out of the system through the take-out pipe 1b.

When the filtration operation as described above is performed, the filter medium layer 1
Although it is clogged from the lower layer of 3a, the water surface of the air chamber 4 and the inner air chamber 5 is gradually pushed down by supplying high-pressure air from the air supply pipe 7 to the air chamber 4 at the same time as the above-mentioned operation start. Then, when the water surface reaches the lower end opening of the lift pipe 2, the high-pressure air flows into the lift pipe 2, and the dirty filter medium 13 around the lower end opening of the lift pipe 2 is entrained and conveyed upward.

When high-pressure air flows into the lift pipe 2, the air chamber 4 and the inner air chamber 5 are struck by the supply air from the air supply pipe 7, and the filtrate from the water conduit 6 and the bottom of the filtration tank 1. The undiluted solution infiltrates instead of the stored air.

In this way, the filter medium 13 conveyed in the lift pipe 2 is disturbed by the rising air and the water flow in the lift pipe 2, and the contaminants and the like that come into contact with each other and adhere to the surface thereof are peeled off and washed. , Overflow from the upper end of the lift pipe 2 into the washing tower 3.

The filter medium 13, which is heavier than water, sinks and returns to the filtrate chamber 1a through the communication port 3a, and the communication port 3a.
When it passes through, the distribution plate 8 is rinsed by the ascending filtrate and is distributed to the upper surface of the filter medium layer 13a to form a regenerated filter medium layer 13a. On the other hand, light contaminants and the like separated from the filter medium 13 float in the washing tower 3 and drainage pipe 3b.
Is discharged from the system.

In the present invention, the filter medium layer 1 is formed as described above.
The dirty filter medium 13 at the bottom of 3a is washed while being conveyed upwards, and only the washed filter medium 13 is distributed on the upper surface of the filter medium layer 13a to restore this circulation forming the regenerated filter medium layer 13a. is there. On the other hand, the carrier device that circulates the filter medium 13 in this way operates intermittently to automatically convey the filter medium 13 upward when the air pressures in the air chamber 4 and the inner air chamber 5 reach a certain level or higher. A small amount of air may be stored in the air chamber 4 and the inner air chamber 5 over time, and the air source to be supplied may be a small-sized small-capacity compressor.

Further, the spindle 9 provided below the lift pipe 2 can adjust the gap between the lower end opening of the lift pipe 2 and the inner air chamber 5 and the filtration tank 1 by moving the spindle 9 up and down. It is possible to adjust the transportation timing and the transportation force of 13.

Also, the spindle 9 is now the lift tube 2
High-pressure air in the air chamber 4 and the inner air chamber 5 can be ejected into the filter medium layer 13a below the air chamber 4 by closing the lower end opening of the filter medium 13 below the lift pipe 2.
In case of clogging, it can be agitated to normalize. Conventionally, in the lift device for this type of filter medium 13,
When an abnormality occurs in the pulling-out portion of the filter medium 13, it is necessary to stop the operation and pull out the filter medium 13, etc. However, the device according to the present invention continues to run and still receives an external force. Can be operated.

Further, in the present invention, at the time of carrying and cleaning the filter medium 13, in the present invention, since the water guiding pipe 6 is provided and the filtrate is used for carrying and cleaning,
The lower end of the lift pipe 2 does not have a shortage of transporting force due to a shortage of water, and continuous operation for a long time is possible.

[0029]

As described above, in the filter medium transfer device according to the present invention, the power of the compressor, which is a high-pressure air source for transferring the filter medium, is small, and the accidental transfer of the filter medium occurs. In such a case, it is possible to solve all the drawbacks of the conventional device of this kind, such that the normal state can be restored by an external operation without discharging the filter medium.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a transfer device according to the present invention.

FIG. 2 is likewise a schematic longitudinal sectional view of another embodiment.

[Explanation of symbols]

 1 Filtration tank 1a Filtrate chamber 2 Lift pipe 3 Washing tower 4 Air chamber 5 Inner air chamber 9 Spindle 13 Filter medium 13a Filter medium layer

Claims (1)

[Claims] 1. A filter tank 1 is loaded with a granular filter medium 13 such as sand, a lift pipe 2 for transporting the filter medium is erected at the center of the filter tank 1, and the upper end of the lift pipe 2 is placed inside the filter tank. Is opened in the washing tower 3 which is provided in the vicinity of the lift pipe 2 and communicates with the filtration tank 1, and the lower end thereof is opened below the air chamber 4 provided at the bottom of the filter medium layer 13a. The upper part is connected to a high-pressure air source outside the filtration tank, and the bottom part is connected to the filtrate chamber 1a above the filter medium layer 13a, and the lift pipe 2 is flexed in the air chamber 4 so that its upper end is Above air chamber 4
An inner air chamber 5 which communicates with the filtration tank 1 at the bottom of the lift pipe 2 is provided in the vicinity of the lift pipe 2, and below the lower end opening of the lift pipe 2, there is provided a spindle 9 capable of opening and closing the opening. A filter material transfer device in a moving filter bed filter provided.