JPH0737684Y2 - Clear water extraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a supernatant water extraction device in a waste water treatment device, and in particular, repeats aeration / precipitation and discharge steps in a single treatment tank. The present invention relates to a device for extracting supernatant water from a batch tank.

[Prior Art] Conventionally, as a supernatant water extraction device, a device with a float water collecting device is provided along a guide rod to elevate and lower the liquid level of a treatment tank according to the water level to discharge the supernatant water (actually, (Kosho 59-23065)
Alternatively, there is a device (Jitsuko Sho 63-37119) that installs a check valve in the water collecting device with a float, sucks the treated water from the water collecting device with a pump, and opens the check valve to drain the supernatant water. It was

[Problems to be Solved by the Invention] However, in the conventional device that raises and lowers the water collecting device along the guide rod, the water collecting device does not rotate and the drain pipe is twisted. Although it is advantageous in a device that continuously discharges treated water, when the water level drops, there is a risk of sucking the filth that has settled in the lower layer of the treatment tank. It was necessary to open and close the outer valve each time.

In addition, in a device in which a check valve is provided in the water collecting device and the check valve is opened and suctioned by a pump, the supernatant water can be freely discharged by operating or stopping the pump. And the equipment such as the suction pipe was necessary, and it was expensive.

[Means for Solving the Problems] The present invention solves the above-mentioned conventional drawbacks.
Adjusting the buoyancy by introducing or discharging make-up water to the float of the water collecting device to adjust the position of the water collecting device with respect to the water surface during the process of collecting supernatant water in the batch tank and during the aeration / precipitation process. Thus, it is possible to prevent the pollutant from overflowing during aeration operation.

That is, the structure is such that a float is provided around the guide rod, an overflow gutter for inflow of supernatant water is provided on the outer peripheral portion of the float, and a trough for draining the supernatant water is provided under the float. In a device that surrounds the guide rod and is provided with an extendable water collecting pipe connected to the bottom of the water collecting device and discharges the supernatant water to the outside of the tank, a water supply for buoyancy adjustment is provided above the float. A device, a drainage through hole at the bottom of the float, and an opening / closing device for the through hole are provided, and a weight is connected to the valve body of the opening / closing device, and a weight is attached to the valve rod hanging from the through hole of the float into the trough. In the normal state, the valve body closes the through hole, and the operating member provided on the valve rod is extended in the direction of the guide rod so as to face the virtual moving range of the operating member by raising and lowering the water collecting device. , A stopper is provided on the guide rod near the minimum water level,
When the operating member comes into contact with the stopper, the valve body is pushed up to open the through hole.

[Operation] After the aeration and precipitation steps of the batch tank are completed, makeup water is introduced into the float for a certain period of time to lower the water level of the water collecting device to the water level during operation, and the supernatant water flows into the water collecting device. It is discharged to the outside of the tank through the water collection pipe. When the water level drops as the water collection progresses, the water collection device also descends, and the striker of the opening / closing device provided in the through hole of the float contacts the stopper. Then, when the valve body slides upward to open the through hole, the makeup water in the float is drained, whereby the buoyancy of the float increases and the water collecting device floats up to the water level when stopped. When the actuating member moves away from the stopper, the weight of the weight causes the valve element to descend and close the through hole of the float. next,
Raw water is made to flow into the batch tank and the aeration process is started.

[Embodiment] The present invention will be described in detail with reference to the drawings.
Reference numeral 1 is a guide rod, the lower end of which is fixed to a drainage pipe 3 provided in the batch tank 2 and the upper end of which is on the liquid surface. A water collecting device 5 having a float 4 attached to the upper portion is provided on the outer circumference of the guide rod 1. An expandable water collecting pipe 6 inserted into the guide rod 1 is connected to the lower end of the water collecting device 5, and the lower end of the water collecting pipe 6 is connected to the upper end of the drain pipe 3. The water collecting device 5 has a trough 8 having a funnel-shaped bottom and a communication hole 7 in the periphery, and an overflow gutter in which the upper end of the trough 8 is raised above the bottom wall of the float 4. 9 and a baffle plate 10 having an upper end supported by the float 4 and a lower end submerged below the liquid surface outside the overflow gutter 9. And
The upper end of the overflow gutter 9 is raised above the bottom wall of the float 4. The supernatant water is baffle plate 10 from below the liquid surface.
And rises between the overflow gutter 9 and flows into the overflow gutter 9. Then, the trough 8 passes through the communication hole 7 provided on the outer periphery of the trough 8.
It flows into the inside, flows down the water collection pipe 6, and from the drain pipe 3 the batch tank 2
It is discharged outside. The scum floating on the liquid surface is blocked by the baffle plate 10 so that it does not flow into the trough 8. A water supply hose 11 for adjusting buoyancy is connected to the float 4. When a set amount of makeup water is introduced into the float 4, the weight of the water causes the water collecting device 5 to sink to the operating water level. Then, the upper end of the overflow gutter 9 is submerged below the liquid surface, and the collection of the supernatant water can be started. The water supply hose 11 is supported by a pulley 12 so that the slack of the water supply hose 11 due to the change in the liquid level can be absorbed. As shown in FIG. 2, the bottom of the float 4 has a through hole for drainage.
13 and an opening / closing device 14 for the through hole 13 are provided. The opening / closing device 14 is installed upright on the peripheral portion of the through hole 13 and has a large number of small holes.
The valve guide 16 having 15 ... It consists of a striker 19 and a weight 20 extending in the direction of the rod 1.
When the valve body 17 rises in the guide 16, the through hole 13 and the small hole 15
The valve seat 17
The boss portion is fitted into the through hole 13 to close the through hole 13. A stopper 21 is provided below the guide rod 1 slightly above the lower limit when the clear water is extracted and the water collecting pipe 6 contracts, and in the virtual movement range of the striker 19. When the water collection progresses and the water level drops and the water collection device 5 descends, the striker 19 connected to the valve body 17 comes into contact with the stopper 21, and at that time, the valve body 17 is pushed up and the float 4 is moved. The makeup water inside can be discharged from the through hole 13. Then, the makeup water in the float 4 is discharged to increase the buoyancy, the water collecting device 5 floats to the water level at the stop, and when the striker 19 separates from the stopper 21, the valve body 18 descends due to the weight of the weight 20. Through hole 13
Is designed to be closed. Further, the upper end of the overflow gutter 9 rises above the liquid surface as the water collecting device 5 floats. The water collecting device 5 holds the water level at the time of stop during each process of inflowing sewage-aeration-precipitation in the next process, and prevents inflow of sewage into the water collecting device 5. Reference numeral 22 is a make-up water valve provided in the water supply hose 11, which is adapted to be closed when the make-up water is introduced into the float 4 and the water collecting device 5 reaches the operating water level. Reference numeral 23 is a water collecting valve provided in the drainage pipe 3. Further, when discharging the deposits accumulated in the batch tank 2, the water collecting device can be held in a state where the striker 19 is in contact with the stopper 21.

[Effect] Since the present invention is configured as described above, the makeup water is introduced into the float and the water collection is started by allowing the water collection device to sink to the water level during operation. Then, at the end of the water collection, the operating member of the float opening / closing device contacts the stopper, so that the makeup water in the float is automatically discharged and the buoyancy increases, and the water collection device floats to the water level when stopped. To stop collecting water. That is, the present invention can automatically start and stop the collection of treated water only by supplying makeup water to the float, and can also prevent the inflow to the water collection device during the next process such as aeration. It is a thing.

[Brief description of drawings]

FIG. 1 is a side view of a supernatant water extraction device according to the present invention,
FIG. 2 is a side view of the main part of the extracting device. Explanation of symbols 1 ... Guiding rod, 2 ... Batch tank, 4 ... Float, 5 ...
Water collecting device, 6 ... Water collecting pipe, 8 ... Trough, 9 ... Overflow gutter, 11 ... Water supply hose, 13 ... Through hole, 14 ... Opening / closing device,
15 …… Small hole, 16 …… Valve guide, 17 …… Valve disc, 18 …… Valve rod, 19 …… Striker, 20 …… Weight, 21 …… Stopper

Claims (1)

[Scope of utility model registration request] 1. A float 4 is provided around a guide rod 1, and an overflow gutter 9 for inflowing supernatant water is provided on an outer peripheral portion of the float 4, and a trough 8 for draining the supernatant water is provided under the float 4. A water collecting device 5 and a retractable water collecting pipe 6 surrounding the guide rod 1 and connected to the bottom of the water collecting device 5, wherein a water supply device for adjusting buoyancy is provided above the float 4. 11
And a through hole 13 for drainage at the bottom of the float 4, and this through hole 13
The opening / closing device 14 is provided, and the weight 20 is arranged on the valve rod 18 that is connected to the valve body 17 of the opening / closing device 14 and hangs from the through hole 13 of the float 4 into the trough 8. The through hole 13 is closed by 17 and the operating member 19 provided on the valve rod 18 is provided.
Is extended in the direction of the guide rod 1 so as to face the virtual movement range of the operating member 19 by raising and lowering the water collecting device 5, and a stopper 21 is provided on the guide rod 1 near the lowest water level.
When contacting with 21, the valve body 17 is pushed up, and the through hole 13 is opened.