JPH02211203A - Rapid filtering apparatus - Google Patents

Abstract

PURPOSE:To prevent the outflow of move than a necessary amount of a liquid to be filtered and to reduce a washing time by connecting one end of a return pipe having an inner diameter smaller than that of a siphon tube to the highest part of said siphon pipe and opening the other end thereof at a position under the overflow port of a storage chamber and providing a washing time controller to a control tank. CONSTITUTION:When a filter material 8 is washed, the liquid level of the liquid to be filtered in a storage chamber 9 as the liquid to be filtered after washing flows out toward a control tank 3 through a siphon pipe 12 and, when said liquid level reaches the opening end of the return pipe 18 opened to the storage tank 9 or less, the open air invades in the return pipe 18 and, as a result, the siphoning action of the siphon pipe 12 to which the return pipe 12 is connected is stopped and the outflow of the liquid to be filtered to the control tank 3 through the siphon pipe 12 is also stopped to complete the washing of the filter material 8. The washing time from the point of time when a liquid feed pump 5 is stopped to the restarting time of said pump 5 is arbitrarily controlled by a washing time controller 30 equipped with a volume controller 20a and a flow rate control valve 20b. By this method, the consumption of the filtered liquid and the washing time can be reduced and the operation of the apparatus can be made efficient and economical.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention comprises a liquid feed pump and a filtration tube, and the pump sends the liquid to be filtered from the storage tank to the filtration chamber in the filtration tube, and the filter medium is fed into the filtration chamber in the filtration tube. The filtered liquid from which the mixed substances to be filtered have been filtered by passing through is guided to the filtered liquid storage chamber formed in the space above the filtration cylinder by siphon action, and is allowed to flow out from the overflow pipe to the next stage. This invention relates to a rapid filtration device that can be sent to a process.

[Conventional technology]

Generally, as shown in FIG. 2, this type of rapid filtration device has a filtration chamber 7 in which a filtration tube 2 is provided with a filtration medium 8.
and a filtrate storage chamber 9 isolated from each other above the filtration chamber 7, and the space below the filter medium 8 in the filtration chamber 7 and the storage chamber 9 are connected to each other via a siphon pipe 11. Along with the communication, an overflow port pipe 10 is installed at a suitable place in the upper part of the storage chamber 9.
is provided, and the liquid storage tank 1 to be filtered and the filtration chamber 7 provided outside the filtration tube 2 communicate with each other through a liquid feed pipe 6 equipped with a liquid feed pump 5 in the middle, while the filtration chamber The upper space of the filter medium 8 inside the filter 7 and the adjustment tank 3 provided outside communicate with each other via the siphon pipe 12. A switch 16 is provided to determine the liquid level when the liquid inside the adjustment tank 3 flows out from the upper overflow port pipe 13 to the external tank 4;
The liquid level when similarly flowing out from the lower drain pipe 14 is detected and the necessary electrical operation is performed, and both liquid position needle switches 15 and 16 are connected to the liquid level via an electric circuit 17. Connected to the drive source of the feed pump.

When performing normal filtration operation in a rapid filtration device having the above-mentioned configuration, the liquid to be filtered stored in the liquid to be filtered storage tank 1 is transferred to the filter tube 2 by the liquid feeding ribbon 5 via the liquid feeding pipe 6. The liquid is fed into the space above the filter medium 8 inside the filtration chamber 7, and after passing through the filter medium 8 and filtering out the substances to be filtered mixed therein, the liquid feed pump 5 is sent from the space below the filter medium 8. Due to the pressure of There is.

By the way, if the filtration operation described above continues for a long period of time and the filter material 8 becomes clogged due to an increase in the amount of substances to be filtered and removed from the liquid to be filtered, and it becomes difficult for the liquid to be filtered to pass through the filter medium 8, the liquid to be filtered becomes The water flows out from the space above the filter medium 8 through the siphon pipe 12 directly toward the external adjustment tank 3 without being filtered. In the adjustment tank 3, as a result of the inflow of a large amount of the liquid to be filtered, the liquid level rises and finally begins to flow out from the overflow port pipe 13 at the upper part toward the tank 4. When the liquid level is detected and the level rises, the liquid level rises. The liquid level gauge switch 15 operates to stop the operation of the liquid feed pump 5 via the electric circuit 17. As a result, the pressure from the liquid delivery ribbon 5 disappears, and at the same time, the filtered liquid stored in the storage tank 9 at the top of the filtration cylinder 2 passes through the siphon pipe 11 in the opposite direction to the normal case by its head. The filter material 8 flows into the space below the filter material 8 in the filtration chamber 7, and after the filter material 8 is violently jetted up from below and cleaned, it flows into the adjustment tank 3 together with the washed-off substances to be filtered by the siphon action of the siphon pipe 12, and the overflow port is formed. The receiver also flows out via pipe 13 into tank 14 .

After the cleaning action of the filter medium 8 by the liquid to be filtered continues for a while, when the filtered liquid in the storage chamber 9 has completely flowed out, outside air flows into the siphon pipes 11 and 12, and the siphon action is stopped. On the other hand, the liquid to be filtered that has flowed into the adjustment tank 3 also flows out into the receiving tank 4, and the liquid level gradually decreases, and when it finally falls to the position of the drain pipe 14 at the bottom, the low level gauge switch 16 is activated. The stopped liquid feed pump 5 is restarted via the electric circuit 17, and the liquid to be filtered is newly fed from the storage tank 1 to the filtration chamber 7, and normal filtration operation is resumed. Therefore, in this type of rapid filtration device, each time the filter medium 8 becomes clogged, the process of stopping the filtration operation, cleaning the filter medium 8, and restarting the filtration operation after cleaning is automatically repeated.

[Problem to be solved by the invention]

However, in the conventional rapid filtration device as described above, when cleaning the filter medium 8 inside the filtration chamber 7 of the filtration tube 2, the siphon pipe 11 is removed from the storage chamber 9 of the filtration tube 2 at the same time as the liquid feed pump 5 is stopped. After cleaning the filter medium 8, the entire amount of the filtered liquid in the storage chamber 9 flows into the adjustment tank 3 through the siphon pipe 12. However, the receiver further flows out from the adjustment tank 3 toward the tank 4, the level of the liquid to be filtered in the adjustment tank 3 decreases, and the liquid feed pump 5 is restarted for the first time when the reduction needle switch 16 is activated. Since the filtration operation can be started, more filtered liquid than necessary and more time than necessary are consumed to clean the filter medium 8, which is not efficient or economical. It has the problem of being extremely disadvantageous.

The present invention is an efficient and economical rapid filtration device that solves the above-mentioned problems of conventional rapid filtration devices and makes it possible to wash the filter medium in a short time with the minimum amount of liquid to be filtered. The purpose is to provide

[Means to solve the problem]

In order to achieve the above object, the present invention comprises a liquid feeding pump and a filtration cylinder, and the liquid to be filtered mixed with the pump is sent from the storage tank to the filtration chamber inside the filtration cylinder and passes through the filter medium. The liquid to be filtered from which substances have been filtered is guided by siphon action into a storage chamber formed in the space above the filtration chamber of the filtration tube, and is then flowed out through the overflow pipe and sent to the next process. In the filtration device, the filter medium provided in the filtration chamber inside the filtration cylinder is cleaned by the filtered liquid to be filtered stored in the storage chamber inside the filtration cylinder, and the upper side of the filtration medium A return having an inner diameter smaller than that of the siphon pipe is provided at the highest part of the siphon pipe, which communicates the space with a regulating tank disposed outside the filtration cylinder and equipped with means for controlling start/stop of the liquid feed pump. One end of the pipe is communicated with the other end, and the other end is opened at an appropriate position below the overflow pipe in the storage chamber inside the filtration cylinder, and after the liquid feeding pump has stopped and cleaning has started, the liquid feeding is started. A cleaning time regulator for adjusting the cleaning time until the pump starts is provided in the adjustment tank.

[Effect]

By configuring the rapid filtration device according to the present invention as described above, when cleaning the filter medium, as the liquid to be filtered after cleaning flows out toward the adjustment tank via the siphon pipe, the storage chamber When the liquid level of the liquid to be filtered in the storage chamber decreases to below the open end of the return pipe that opens into the storage chamber, outside air enters the return pipe, causing the return pipe to communicate with the siphon of the siphon pipe. The action is stopped, and the outflow of the liquid to be filtered through the siphon pipe to the adjustment tank is also stopped, so that cleaning of the filter medium can be completed.

The cleaning time adjuster can arbitrarily adjust the cleaning time from when the liquid feed pump stops until it starts again.

〔Example〕

As illustrated in the figure, the filter tube 2 consists of a filtration chamber 7 having a filtration material 8 therein and a liquid storage chamber 9 to be filtered isolated from each other above the filtration chamber. The space below 8 and the storage chamber 9 communicate with each other via a siphon pipe 11, and an overflow pipe 10 is provided at a suitable upper part of the storage chamber 9. The liquid storage tank 1 to be filtered and the filtration chamber 7 communicate with each other through a liquid feed pipe 6 in which a liquid feed pump 5 is provided at a suitable location, while the space above the filter medium 8 in the filtration chamber 7 and the outside are connected to each other. The adjustment tank 3 provided therein communicates with each other via a siphon pipe 12, and the adjustment chamber 3 is provided with a high level gauge switch 15 and a low level gauge switch 16. The external receiver detects the liquid level when it flows out into the tank 4 from the overflow port pipe 13, and the liquid level when it flows out into the tank 4 from the lower drain pipe 14, and performs the required electrical operation. , and the dual-liquid needle position switch 1
5 and 16 are connected to the drive source of the liquid feed ribbon 5 via an electric circuit 17, and during normal filtration operation, the liquid to be filtered stored in the liquid to be filtered storage tank 1 is transferred to the liquid feed pipe by the liquid feed pump. 6 to the filter medium 8 in the filtration chamber 7 of the filter tube 2
The mixed substance to be filtered is filtered by being sent into the upper space and passing through the filter medium 8, and from the space below the filter medium 8, it is sent through the siphon pipe 11 by the pressure of the liquid feed pump 5 to the liquid to be filtered storage chamber. It is the same as in the case of the conventional rapid filtration apparatus that the water is guided to the next step through the overflow port pipe 10.

Furthermore, as the filtration operation continues for a long period of time, the filter material becomes clogged due to an increase in the substances to be filtered and removed from the liquid to be filtered, and the filter medium eventually becomes clogged and no longer allows the liquid to pass through, leaving the liquid to be filtered unfiltered. Direct adjustment tank 3 via a siphon pipe 12 that communicates the upper space of 8 with the external adjustment tank 3.
When the liquid level starts to flow out, the high liquid level gauge switch 15 detects the rise in the liquid level in the adjustment tank 3 and stops the liquid feed pump 5 via the electric circuit 17. At the same time, the pressure disappears and the filter cylinder 2 is stopped. The filtered liquid stored in the storage chamber 9 flows back through the siphon pipe 11 by its head and is blown up from the space below the filter medium 8 in the filtration chamber 7 to clean the filter medium. It flows into the adjustment tank 3 together with the substances to be filtered that have been washed away by the siphon action, and the receiver flows out toward the tank 4 through the overflow pipe 13.
As a result, when the filtered liquid in the storage chamber 9 completely flows out, outside air enters the siphon pipes 11 and 12 and the siphon phenomenon is stopped, while the filtered liquid that has flowed into the adjustment tank 3 also flows out. When the liquid level in the receiver drops to the level of the drain pipe at the bottom due to flowing out toward the tank 4, the low liquid level gauge switch 16 is activated to restart the stopped liquid feed pump, and the liquid is newly drained. Since the filtrate is sent from the storage tank 1 into the filtration tube 2, normal filtration operation is carried out.
As in the case of conventional rapid filtration devices, the process of stopping the filtration operation, cleaning the filter medium 8, and restarting the filtration operation after cleaning is automatically repeated each time the filter medium 8 becomes severely clogged. .

However, in the rapid filtration device according to the present invention, as illustrated in FIG. The siphon pipe 12 communicates with the highest part of the siphon pipe 12.
The free end of the return pipe 18, which has an inner diameter smaller than that of the return pipe 18, is opened at an appropriate position in the filtered liquid to be filtered inside the storage tank 9 of the filtration cylinder 2 to provide an open end 19. Therefore, as described above, when the high liquid level gauge switch 15 of the adjustment tank 4 is activated and the operation of the liquid feed pump 5 is stopped, the liquid to be filtered inside the storage tank 9 flows through the siphon pipe 11 with its head. The liquid to be filtered then flows into the lower space of the filter medium 8 in the filtration chamber, the filter medium 8 is blown up and washed, and the liquid to be filtered flows out from the upper space of the filter medium 8 into the adjustment tank 4 by the siphon action of the siphon pipe 12. When the liquid level is at the open end 19 of the return pipe 18
The inside of the return pipe 18 is filled with the filtrate as long as it is on the upper side, but the liquid to be filtered gradually decreases and the liquid level lowers until it reaches the lower side of the open end 19 of the return pipe 18. When it descends, the outside air that enters from the overflow pipe IO of the storage tank 9 enters the siphon pipe 12 via the return pipe 18 and stops the siphon action. As a result, after the filter medium has been washed from the storage tank 9, the outflow of the liquid to be filtered toward the adjustment tank 3 is blocked, and the liquid to be filtered that has flowed into the adjustment tank 3 flows out into the external tank 4, and its liquid level When the level drops to the position of the drain pipe 14 of the adjustment tank 3, the low level gauge switch 16 operates and restarts the liquid feed pump 5 via the electric circuit 17.
Resume normal filtration operation of the rapid filtration equipment. Therefore, the filter medium 8 can be washed in a short time using the minimum required amount of filtered liquid.

Furthermore, in the rapid filtration apparatus according to the present invention, a volume regulator 20a or a flow rate regulating valve 20b is provided in the regulating tank 3 as a cleaning time regulator 20 for arbitrarily adjusting the cleaning time. The volume regulator 20a is a rod-shaped body having a suitable cross-sectional shape and is movable up and down, and the volume of the adjustment tank 3 changes by its vertical movement.
Cleaning from when the liquid level reaches , the liquid feed pump 5 is stopped and filtration of the filter medium 8 starts, until the liquid level drops to the low liquid level indicator switch 16 and the liquid feed pump 5 is started again. For example, if the volume of the adjustment tank is decreased by lowering the volume regulator 20a, the cleaning time will be shortened. At this time, as described above, after the filter medium 8 becomes clogged and the liquid to be filtered begins to flow directly from the liquid feed pump 5 into the adjustment tank 3 via the siphon pipe 12, the liquid level in the adjustment tank 3 rises. Naturally, the cleaning start time until the liquid feeding ribbon 5 is stopped is also shortened. Next, the flow rate adjustment valve 20b is provided in the overflow pipe 13 and can adjust the flow rate.
If the flow rate is adjusted to be larger, the volume adjuster 20
Similar to the effect of a, both the cleaning time and the cleaning start time are shortened. Note that the volume regulator 20a and the flow rate regulating valve 20b may be used together.

〔Effect of the invention〕

As explained above, the present invention comprises a liquid feed pump and a filtration cylinder, and the pump sends the liquid to be filtered from the liquid storage tank to the filtration chamber in the filtration cylinder, and the substance to be filtered is mixed by passing through the filter medium. In a rapid filtration device, the filtered liquid is guided by a siphon action to a liquid storage chamber formed in the upper space of the filtration cylinder, and is caused to flow out from the overflow pipe and sent to the next process. , a device for cleaning the filter medium provided in a filtration chamber inside the filter cylinder with the filtered liquid to be filtered stored in a storage chamber inside the filter cylinder, and a space above the filter medium and the One end of a return pipe having an inner diameter smaller than that of the siphon pipe is connected to the highest part of the siphon pipe, which is arranged outside the filtration cylinder and communicates with a regulating tank equipped with a means for controlling start/stop of the liquid feed pump. At the same time, the other end is opened at an appropriate position below the overflow port side in the storage chamber inside the filtration cylinder, and after the liquid feeding pump has stopped and cleaning has started, the liquid feeding pump is started. By installing a cleaning time adjuster in the adjustment tank to adjust the cleaning time, the filtered liquid in the storage chamber of the filtration cylinder flows out in an amount necessary for cleaning the filter medium. After that, the siphon action of the siphon pipe is stopped via the return pipe, and further outflow of the liquid to be filtered is prevented, and the washing time and washing start time can be adjusted.
The consumption of filtered liquid to be filtered and the time for cleaning can be reduced, which has the effect of making the operation of the rapid filtration device more efficient and economical.

[Brief explanation of the drawing]

FIG. 1 is a schematic equipment layout diagram illustrating the configuration of a rapid filtration apparatus according to the present invention, and FIG. 2 is a schematic equipment layout diagram illustrating the configuration of a conventional rapid filtration apparatus. l...Liquid storage tank to be filtered, 2...filtration tube, 3...adjustment tank, 5...liquid feed pump, 7...filtration chamber, 8...
・Filtering material, 9...Storage chamber, lO...Overflow port pipe, 1
1.12...Siphon pipe, 18...Return pipe, 19.
...Opening end, 20...Volume regulator, 21...Flow rate adjustment valve. Figure 1 Figure 2

Claims (1)

[Claims] 1) Consists of a liquid feed pump and a filtration tube, the pump sends the liquid to be filtered from the storage tank to the filtration medium in the filtration tube and passes through the filter material, so that the mixed substances to be filtered are filtered. In the rapid filtration device, the filtrate is guided by a siphon action to a liquid storage chamber formed in the upper space of the filtration cylinder, and is caused to flow out from the overflow pipe and sent to the next process. A device is provided for cleaning the filter medium provided in the filtration chamber inside the filter cylinder with the filtered liquid stored in the internal storage chamber, and the space above the filter medium and the outside of the filter cylinder. One end of a return pipe having an inner diameter smaller than that of the siphon pipe is communicated with the highest part of the siphon pipe, which is arranged in the siphon pipe and communicates with a regulating tank provided with a means for controlling starting and stopping of the liquid feed pump, and The other end is opened at an appropriate position below the overflow pipe in the storage chamber inside the filtration cylinder, and the cleaning time is from the time when the liquid feed pump stops and cleaning starts until the time when the liquid feed pump starts. A rapid filtration device characterized in that the adjustment tank is provided with a cleaning time adjuster for adjusting the cleaning time.