KR910000468Y1 - Automatic upward filtering apparatus - Google Patents

Abstract

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Description

Automatic Upflow Filter

1 to 4 is a schematic longitudinal cross-sectional view showing the configuration and operation of the automatic upstream filtration device according to the present invention, Figure 1 is an explanatory view showing the action of the normal filtration.

2 is an explanatory diagram showing a back washing process by water and air.

3 is an explanatory diagram showing a water alone filtration process.

4 is an explanatory diagram showing a rinsing process.

5 is a cross-sectional view of the non-return valve according to the present invention.

6 is a cross-sectional view taken along the line A-A of FIG.

* Explanation of symbols for main parts of the drawings

1: filtration tank 2: check valve

3: plate 4: water purification pipe

5: water purification chamber 6: filtration layer

7: filtration chamber 8: pressurization chamber

9: head tank 10: raw water supply pipe

11: raw water inlet pipe 20: backwash water drain valve

21: backwash water drain pipe 22: catch trap

24: air supply valve 25: air supply pipe

27: level switch 28: backwash water supply valve

29: water supply pipe for backwash 30: level switch

The present invention is an automatic upflow filter for filtering raw water after washing the filtration layer to remove impurities when a certain amount of impurities are accumulated in the filtration layer for filtering the raw water, and the filtration chamber under the diaphragm provided with a backflow prevention valve. A liquid water drain pipe and an air supply pipe are respectively installed at one side of the pressurization chamber at the lower part of the filtration chamber, and a backwashing water supply pipe is connected between the lower end of the purification chamber and the pressurization chamber to improve the backwash efficiency of the filtration layer. The present invention relates to an automatic upflow filter which has a stabilizer in the backwashed filtration layer to supply clean filtered water immediately after the backwash is completed.

In the related art, a ″ automatic upflow filter ″ which not only filters up the raw water supplied from the head tank by using a counterflow valve installed in the diaphragm but also washes by upstream water even when the filtration layer is backwashed, Was filed as an application for registration (Utility Model Registration No. 718 of 1985, Publication No. 87-3400) and registered as Utility Model Registration No. 36398.

This method of filtration by an upflow filter is included in the raw water while the raw water supplied to the lower part of the filtration chamber is sequentially passed through the filtration layer composed of granulated, neutral and fine grain layers. Since the alleles of suspended solids are removed from the granulated layer, the intermediate particles are removed from the neutral layer, and the small particles are removed from the fine layer, the filtration efficiency is superior to that of the downflow filter. The increase in head is relatively small and thus has an advantage of prolonging the filter duration.

However, in the conventional upflow filtration method, since the amount of suspended solids trapped in the filtration layer is large, the effective water removal of the suspended solids trapped in the filtration layer is not easily performed by the backwashing method using only backwash water. Immediately after defects and backwashing are completed, that is, some of the backwashing water is contained in the filtered water supplied to the purification chamber at the beginning of the refiltration. The siphon pipe for drainage of the backwashing water is usually installed in the upper part of the filtration chamber. Since the lower end of the siphon pipe installed outside of the tank is enclosed in the water sealing tank, one side of the siphon pipe exposed to the outside of the filtration tank is provided with a siphon start pipe for forming a siphon and a separate tank having a float valve. It has a complicated configuration that needs to be installed, and many difficulties and difficulties in keeping warm in winter The dots were.

Therefore, the present invention has been devised to solve the problems and problems of the conventional upflow filter, the upper part of the filter chamber on one side of the upper and lower side wall of the filter chamber partitioned by a diaphragm with a check valve Install a backwash water drain pipe and an air supply pipe that can drain back the backwash water immediately, so that the drain pipe and the supply pipe are opened by a level switch operated according to the head tank water level rise. By installing a backwash water supply pipe connected to the raw water inlet pipe connected to the chamber, the backwash water drainage pipe at the top of the filtration chamber is opened at the beginning of the backwashing of the filtration layer according to the increase of the filtration column, and is supplied through the air supply pipe. Backwashing using air and raw water supplied to the pressurization chamber is performed for a certain time, and then It is possible to improve the backwashing efficiency of the filtration layer by the high-pressure backwashing of water alone by using a large amount of purified water and raw water from the head tank, and at the end of the backwashing step, By rinsing and stabilizing one of the filtration layer to enable the supply of clean filtered water immediately after the completion of backwashing, it will be described in detail by the accompanying drawings as follows.

As shown in FIG. 1, the middle portion of the filtration tank 1 is separated by a diaphragm 3 having a non-return valve 2 to filter the upper water purification chamber 5 in which the purified water outlet pipe 4 is installed. The raw water supplied from the head tank 9 through the raw water supply pipe 10 is partitioned into a lower filtration chamber 7 having a layer 6, and the pressure chamber 8 below the filtration chamber 7. In the upflow filter introduced through the (11), the upstream filtration device according to the present invention is connected to the backwash water drain pipe 21 is provided with a backwash water drain valve 20 on the upper side of the filtration chamber (7). An annular trough 22 having an upper portion opened to an upper end portion of the backwash water drainage pipe 21 extending to an upper center portion of the filtration chamber 7 is connected to several communication pipes 22a; 6, the lower end of the backwash water drain pipe 21 is located in a normal drain 23.

An air supply pipe 25 having an air supply valve 24 is connected to one side wall of the pressure chamber 8 below the filtration tank 1, and the pressure chamber 8 and the filtration chamber 7 are partitioned. Water collecting pipe 12 is a water and air combined strainer of a known type that can supply the raw water supplied through the raw water inlet pipe 11 and the air supplied through the air supply pipe 25 into the filtration chamber 7 (26) is arranged at equal intervals.

In addition, the head tank (9) is operated in accordance with the increase in the water level of the head tank (9), the back-flush drain valve 20 of the backwash water drain pipe 21 and the air supply valve of the air supply pipe ( A level switch 27 is provided to automatically open 24 for a predetermined time set by a timer (not shown in the figure).

On the other hand, between the bottom of the water purification chamber (5) upper side of the filtration tank (1) and the raw water inlet pipe (11) communicating with the pressurizing chamber (8) is a backwash water purification valve provided with a backwash water supply valve (28) The supply pipe 29 is connected and installed.

In the upper part of the water purification chamber 5, a level switch 30 having a water level detecting rod 30a for detecting the lowest water level of the water purification chamber 5 is installed, and the water level of the water purification chamber 5 is set to the lowest water level ( LWL) is configured to close the backwash water supply valve 28 of the open backwash water supply pipe 29.

In the figure, reference numeral 2a shows a valve of the non-return valve 2, and 13 shows a public discharge pipe installed on the top of the water purification chamber 5.

Effects of the present invention configured as described above are as follows.

Figure 1 shows the automatic upflow filtration device according to the present invention at the time of normal filtration, in this case the air supply valve 24 of the drain valve 20 and the air supply pipe 25 of the backwash water drain pipe 21 ) And the backwash water supply valve 28 of the backwash water purification pipe 29 are respectively closed and supplied from the head tank 9 to pressurize the chamber through the raw water supply pipe 10 and the raw water inlet pipe 11. The raw water flowing into (8) enters the filtration chamber (7) through the strainer (26) installed in the collecting plate (12) and is filtered while passing through the filtration layer (6), and the diaphragm (3) After flowing into the water purification chamber 5 with the side plate 2a of the non-return valve 2 installed at the center of the valve upward, when the water level reaches HWL, the water is discharged through the water discharge pipe 4. do.

As the filtration of the filtration layer 6 increases as the filtration of the raw water continues in such a state, the raw water level of the head tank 9 gradually increases, followed by the head tank as shown in FIG. When the water level of (9) reaches the high water level (HWL), the level switch 27 is operated to open the drain valve 20 of the backwash water drain pipe 21 and the air supply valve of the air supply pipe 25 Since 24 is opened for a predetermined time set as a timer, the filtered water accumulated in the collecting trap 22 in the upper part of the filtration chamber 7 is rapidly drained through the open backwash water draining pipe 21 and is opened on the upper side thereof. At the same time, the side plate 2a of the non-return valve 2 is closed, and at the same time, the air supplied from the open air supply pipe 25 and the raw water supplied from the head tank 9 are inside each of the strainers. Through 26 to the top of the filtration layer 6 After the backwashing the filtration layer (6) by air and water while being supplied, the turbid backwash water supplied to the upper part of the filtration chamber (7) is collected through the collecting trap (22) and the backwash drain pipe (21) of the upper part. It is discharged smoothly.

Such a backwashing process by water and air continues for a time set as a timer as described above, and when the predetermined time (about 4-5 minutes) elapses after the start of backwashing, the backwash water drain valve 20 continues to open. In this state, the air supply valve 24 is closed, and the supply of air through the air supply pipe 25 is blocked, and at the same time, the backwash water supply valve 28 of the backwash water purification pipe 29 is automatically opened.

Therefore, according to the opening of the backwash purified water supply pipe 29, as shown in FIG. 3, a large amount of purified water filled in the purified water chamber 5 is supplied to the pressurized chamber 8 at once. The inside of the (8) is a high-speed backwashing of the filtration layer (6) by the high-pressure water while the high pressure backwash water supplied from the water purification chamber (5) and the water pressure of the raw water continuously supplied from the head tank (9) work together This is done for a certain time.

In this state, when the water level in the water purification chamber 5 gradually decreases and the water level in the water purification chamber 5 reaches the low water level LWL as shown in FIG. 4, the level switch 30 is operated to supply backwash water. As the valve 28 is closed, the supply of purified water through the backwash purified water supply pipe 29 is cut off. From this time, only the supply of raw water through the head tank 9 is continued for a predetermined time set as a timer, Rinsing the filtration layer (6) backwashed with high pressure water to stabilize the filtration layer (6), the backwash water at this time is drained through the backwash water drain pipe (21).

When the rinsing and stabilization of the filtration layer 6 by the raw water is completed in this way, the backwash water drain valve 20 of the backwash water drain pipe 21 is closed to normal filtration as shown in FIG. It will be possible to supply to the water purification chamber (5).

As described above, the upstream filtration device of the present invention is provided with a backwash water drain pipe and an air supply pipe each capable of draining backwash water from the upper part of the filtration chamber on one side wall of the filtration chamber and one side of the pressurizing chamber. The installed drain valve and air valve are opened by the level switch operated according to the increase of the water level in the head tank, and a purified water supply pipe is installed to supply high pressure backwash water between the bottom of the purified water chamber and the raw water inlet connected to the pressurized chamber. In the initial stage of the backwashing, the filtration layer was subjected to mixed backwashing by air and water, followed by a large amount of purified water supplied from the purified water chamber and water alone by the raw water of the head tank. Backwashing proceeds, and at the end of backwashing, rinsing of the filtration layer by raw water supplied from the head tank and By allowing stabilization to be performed, the backwashing efficiency of the filtration layer can be greatly improved, and the filtered filtration water can be supplied immediately after the backwashing of the filtration layer is completed.

Claims (1)

The intermediate part of the filtration tank 1 is separated by a diaphragm 3 having a non-return valve 2, and a filtration chamber 7 having a water purification chamber 5 and a filtration layer 6 in which a purified water outlet pipe 4 is installed. In the upflow filter introduced into the pressurized chamber (8) below the filtration chamber (7), the raw water supplied from the head tank (9) through the raw water supply pipe (10) and the raw water inlet pipe (11), The backwash water drain pipe 21 and the air supply pipe 25 each having an annular collecting trap 22 on the upper end and one side of the upper side wall of the filtration chamber 7 and the pressurizing chamber 8 are respectively installed. (21) and the air supply pipe (25) are provided with a backwash water drain valve (20) and an air supply valve (24) opened by a level switch (27) operated according to an increase in the water level of the head tank (9). A backwashing well equipped with a backwash water supply valve 28 closed between the lower end of the water purification chamber 5 and the raw water inlet pipe 11 by the level switch 30 for detecting the low water level in the water purification chamber 5. Automatic upflow filter system, characterized by configured to install the supply pipe (29).