JPH0230003Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a self-water retaining gravity type filtration device.

[Conventional technology]

In the above-mentioned filtration device, the filtration process is performed using water pressure based on the difference between the water level of the raw water and the water level of the filtration storage section, and in the filtration process, turbidity is captured in the material layer and water flow resistance gradually increases. The height of the nozzle for supplying raw water to the overchamber, or when using a pump, its lift, etc., must be set in accordance with the maximum value of water flow resistance.

[The problem that the idea aims to solve]

However, the maximum value of the water flow resistance occurs only for a very short time during the entire passing process of one batch. Considering, for example, the above-mentioned pumps, this means that a substantially oversized device is used and energy is wasted. The same is true even when raw water is supplied by gravity; the height of the raw water storage tank must be made considerably high, and the pump for supplying raw water to the storage tank has exactly the same problems as above.

The present invention aims to provide an effective gravity passing device which eliminates the above-mentioned drawbacks of the conventional ones.

[Means for Solving the Problems] The present invention is a self-water-retaining gravity-type filtration device that is divided into a washing chamber and an overchamber by a partition wall, in which the washing chamber and the overchamber are installed together. The overwater culvert is divided by a partition wall, and the overwater culvert and the water collecting part of the overchamber are communicated through a communication port, and the overwater culvert and the washing chamber are connected to each other by a conduit drilled at an appropriate height of the partition wall. A drain pipe having a drain valve is connected to the overflow chamber, and a movable outflow device connected to a lifting mechanism is provided in the overflow channel, and the outflow device is connected to the outflow pipe. This is a gravity-type filtration device characterized by:

[Effect]

In this gravity-type filtration device, the water level in the filtration chamber rises due to the increase in resistance as the filtration process continues, and the excess water flows into the culvert through the communication port, and eventually the excess water in the culvert increases. is introduced into the cleaning chamber, and backwash water is stored in the cleaning chamber.

On the other hand, as the over-chamber water level rises, the cable connecting the outflow device lowers the outflow device,
The excess water in the overflow channel flows out of the overflow device through the outflow device and the outflow pipe.

Thus, when the water level in the overwater drain drops to a predetermined level, by opening the drain valve of the drain pipe, the overroom water level will drop and the excess water in the cleaning chamber will flow through the inlet, the overwater drain, and the communication port into the overroom. It begins to flow in an upward flow,
The backwash process is started.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the interior of the gravity-type over-tank body 1 is divided into a over-chamber 4, a cleaning chamber 5 by partition walls 2 and 3.
(a compartment for storing excess water as water for backwashing) and an excess water culvert 6 (a compartment for storing excess water and discharging it to the outside of the system).

Above the overchamber 4 is a water level detection mechanism (not shown), and below it, in order from above, a material layer 7 made of anthracite, sand, or other overmaterial, and a support layer 8 made of a support material such as gravel. A water passage partition plate 9 made of a perforated plate or a net-like member is provided, and a superfluous water collecting portion 10 is formed below the water passage partition plate 9.

The space above the material layer 7 of the overchamber 4 is communicated with the outside of the tank body 1 through a drain pipe 12 having a drain valve 11, and the water collecting section 10 is connected to the overflow chamber 4 through a communication port 15 opened in the partition wall 3. It communicates with the water drain 6, and the water in the water drain 6 flows from the upper end of the partition wall 3 to the cleaning chamber 5.
It is configured so that it overflows.

An outflow pipe 16 that communicates with the outside of the tank body 1 is disposed in the lower part of this overwater culvert 6, and an outflow device 17 is floated on the water surface of this overwater culvert 6. The outflow pipe 16 is connected via a telescopic pipe (or flexible pipe) 19. Note that it is also effective to provide a solenoid valve in the outflow pipe 16.

Further, above the overchamber 4, a raw water inflow pipe 20 having an inflow valve 21 and a fixed height position is provided, and the drain pipe 12 and the outflow pipe 16 are arranged such that the water in the pipes flows into the tank only by the water level difference. The tube that is discharged outside the body 1 consists of only a horizontal pipe and a descending pipe.

Further, a float 31 is disposed in the overflow chamber 4, and the float 31 and the outflow device 17 are connected to an automatic lifting mechanism 34 via wire ropes 32 and 33, respectively, and the cleaning chamber 5 and overwater drain 6 are connected to each other via wire ropes 32 and 33, respectively. A ball tap 35 is fixedly provided to the partition wall 3 at the communicating inlet. In the diagram, 35' is ball tap 3
5 is a float, 36, 37, and 38 are fixed guide rollers, and 39 is a float for floating the outflow device 17.

The structure of the automatic lifting mechanism 34 is as shown in FIG. 2, in which the wire rope 33 is wound around a rotatable drum 41, a swing arm 42 is provided on the rotation shaft of the drum 41, and the upper end of the wire rope 33 is wound around a rotatable drum 41. The wire rope 32 is connected to the drum base 4.
3 and a swing arm 42 are connected by a spring 44.

The overworking and backwashing steps in the gravity type overflow device configured as described above are performed, for example, as follows.

(1) Over-step First, the inflow valve 21 is opened. As a result, the raw water flows into the flow chamber 4 and flows downward through the material layer 7, the support layer 8, and the water flow partition plate 9, and the suspended matter in the raw water is captured by the material layer 7, and the excess water flows through the communication port 15. The water then flows into the overwater drain 6. As the water progresses, the water drain 6
The water level rises, and the excess water in the excess water channel 6 eventually overflows into the cleaning chamber 5 from the upper end of the partition wall 3. In this case, the water level in the excess chamber 4 is determined by the sum of the water level in the excess water channel 6, the excess resistance due to the material layer 7, the pressure loss due to the support layer 8, etc.

In FIG. 1, the float 31 gradually rises as the water level in the overchamber 4 rises, so the wire rope 32 is pulled toward the float 31. Therefore, in FIG. 2, the drum 41 rotates counterclockwise together with the swing arm 42. As a result, the wire rope 33 is about to be wound around the drum 41, so the wire rope 33 is pulled toward the drum 41, and the outflow device 17 descends and sinks below the water surface of the overwater culvert 6. Water overflows into the outflow device 17.

In this way, the outflow device 17 descends to counteract the rise in the water level in the overflow chamber 4, and the water level in the overflow channel 6 gradually and continuously falls, but when the water level becomes lower than the height of the float 35' of the ball tap 35, Since the ball tap 35 automatically opens, if the drain valve 11 is opened at this time, the backwashing process can proceed directly.

Note that the opening of the ball tap 35 can be confirmed by, for example, a level switch provided in the overwater drain 6 and a signal transmitted from the level switch.

(2) Backwashing process When the ball tap 35 is opened, the water in the washing chamber 5 begins to flow into the overwater drain 6.
The water in the over-chamber 4 is discharged to the outside of the tank body 1 through the drain valve 11, and the water level in the over-chamber 4 is sufficiently lowered, but at this time, the water level in the over-water channel 6 is sufficiently higher than the over-chamber 4. (The maximum value of this water level is determined by the height of the ball tap 35.) Therefore, the water flows upward into the overchamber 4 through the communication port 15.

Note that the float 31 in the overchamber 4 gradually descends as the water level in the overchamber 4 drops due to the opening of the drain valve 11, but the float 31 is secured with a nylon rope to prevent it from falling below a position that is somewhat lower than the predetermined water level. It is suspended from a member (not shown) via. Therefore, in the above backwashing process, the spring 4
4, the swinging arm 42 rotates clockwise, and the wire rope 32 is pulled toward the swinging arm 42, so that the wire rope 33 tends to slacken. In this case, the water level in the overflow channel 6 rises temporarily and then falls to the water level at the end of the backwashing process and settles down, and the outflow device 17 rises and falls accordingly. Therefore, during the backwashing process, the wire rope 33 is sometimes under tension and sometimes is in a non-tensioned state.

In addition, in order to complete the backwashing process, it is sufficient to close the drain valve 11, and as a result, the water level in the overwater drain 6 rises and the ball tap 35 is closed, so that the backwashing process is automatically completed.

In addition, in the example, an example was shown in which an automatic lifting mechanism and a ball tap were used to automatically shift from overflow to backwashing, but even if only an inlet was drilled in the partition wall 3, the outflow device could be raised and lowered. The same effect can be obtained.
In other words, the position of the inlet may be set so that backwashing starts depending on the water level of the overflow channel.

[Effect of idea]

As mentioned above, with this invention, stable and effective overoperation can be performed even if the height of the overchamber and raw water supply nozzle are significantly lower than that of conventional devices, reducing energy consumption during operation. It is possible to achieve a reduction in construction costs, and there is a practical benefit in that it is possible to easily shift from the overflow process to the backwash process by opening the drain valve of the drain pipe.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a perspective view of an automatic lifting mechanism. 1...tank body, 2...partition wall, 3...partition wall, 4...over chamber, 5...washing chamber, 6...overwater channel, 10...water collection section,
11...Drain valve, 12...Drain pipe, 15...Communication port, 1
6...Outflow pipe, 17...Outflow device, 19...Extensible pipe, 2
DESCRIPTION OF SYMBOLS 1... Inflow valve, 31... Float, 32, 33... Wire rope, 34... Automatic lifting mechanism, 35... Ball tap, 41... Drum, 42... Swinging arm, 44...
Spring.

Claims (1)

[Scope of utility model registration request] In a gravity-type filtration device of self-water retention type, which is divided into a washing chamber and an over-chamber by a partition wall, an over-water culvert is divided by a partition wall to be attached to the washing chamber and the over-chamber, and the over-water culvert is connected to the over-water culvert. The water collection part of the over-chamber is communicated with a communication port, and the over-water conduit and the cleaning chamber are communicated through an inlet drilled at an appropriate height in the partition wall, and a drain valve is provided in the over-chamber. A gravity-type filtration device, characterized in that a movable outflow device connected to an elevating mechanism is provided in the overwater culvert, and the outflow device is connected to the outflow pipe.