JP2598414Y2 - Constant flow discharge device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant flow discharge device capable of draining water from a tank having a large fluctuation in the amount of inflow of water to be treated while maintaining a constant amount of outflow.

[0002]

2. Description of the Related Art Conventionally, in a tank such as a supernatant water discharge device in a batch activated sludge method in which the amount of inflow of water to be treated fluctuates greatly, a mechanical type, a float type, The flow rate is controlled by a mechanism such as a fixed type. As a specific control method, there are a method by electric opening and closing of a valve, a method by a mechanical lifting mechanism, a method by adjusting buoyancy of a float, a method by a siphon and a siphon breaker, and a method by starting and stopping a pump.

[0003]

However, the conventional control method as described above has a problem that it is difficult to discharge a fixed amount because the water level tracking function is unstable.

Another problem is that it is difficult to change the set discharge amount. Further, when controlling the discharge amount of the supernatant water discharge device, the device has a mechanism for preventing scum outflow, and therefore, there is a problem that scum is easily accumulated in the device.

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a discharge device capable of discharging a fixed amount, easily changing a set discharge amount, and preventing accumulation of scum in the device. Things.

[0006]

In order to solve the above-mentioned problems, a constant flow discharge device according to the present invention is a constant flow discharge device disposed downstream of a water tank in which the amount of inflow of treated water greatly varies. An adjustment tank having a closed structure, an inflow pipe communicating with the water tank and allowing the water to be treated in the water tank to flow into the adjustment tank in a constantly submerged state, and an adjustment tank installed on a bottom surface in the adjustment tank to be higher than the inflow pipe; A partition plate that partitions the inside into an upstream side and a downstream side, and an upper edge forms an overflow weir, and one end is opened below the upper edge of the weir plate downstream of the weir plate in the adjustment tank and the other end is adjusted tank. An outflow pipe that opens into the outside water and allows overflow water that exceeds the weir plate to flow out of the tank, an air supply pipe that connects to an air source outside the adjustment tank,
One end is opened in the water tank, and has an adjusting portion which expands and contracts up and down, and an air communication pipe capable of changing a set water level so that the opening end is submerged at a certain water level or higher in the water tank is provided. The submersion and opening of the pipe are detected by the air pressure in the adjustment tank, and based on the result, the scum outflow pipe provided in the water tank is closed when the air communication pipe is submerged, and opened only for a set time when opened. Means for performing the operation.

[0007]

In the above arrangement, an inflow pipe communicating with the water tank and allowing the water to be treated in the water tank to flow into the adjustment tank in a constantly submerged state, and one end open in the adjustment tank and the other end outside the adjustment tank. By providing an outflow pipe that opens into the water and allows the water to be treated in the tank to flow out of the tank, the inside of the adjustment tank can be sealed. In addition, an air supply pipe connected to an air source outside the regulating tank, and an adjusting part that opens into the water tank at one end and expands and contracts up and down, so that the opening end is submerged at a certain water level or higher in the water tank. With the provision of the air communication pipe capable of changing the water level, air can be supplied to the adjustment tank, and the position of the open end of the air communication pipe is adjusted by the adjustment unit, so that the depth of submersion in the water tank is arbitrarily set. be able to. Thereby, in a state where air is supplied under pressure from the air supply pipe, when the open end of the air communication pipe in the water tank is submerged,
Since the inside of the adjustment tank is in a closed state, the pressure at the position of the opening end of the air communication pipe, that is, the pressure corresponding to the depth of submersion, is equal to the air pressure in the adjustment tank.

Therefore, the flow rate of the water to be treated into the water tank fluctuates. For example, when the water level rises, the pressure at the position of the open end of the air communication pipe in the water tank rises.
As air is continuously supplied from the air supply pipe, the air pressure in the adjustment tank rises, and the pressure at the open end of the air communication pipe in the water tank and the air pressure in the adjustment tank are balanced, so adjustment is required. The water level in the tank, that is, the overflow water level is kept constant.

When the water level in the water tank falls, the pressure at the position of the open end of the air communication pipe in the water tank decreases, and the air pressure in the adjustment tank increases. Air flows out from the open end of the pipe, and the pressure at the open end of the air communication pipe in the water tank and the air pressure in the adjustment tank balance, so that the level of the overflow water in the adjustment tank is kept constant. .

As described above, when the water level in the water tank rises and falls, the water level of the overflow water in the regulating tank is kept constant, so that the difference between the level of the overflow water and the upper edge of the overflow weir is maintained. Is kept constant, and a constant flow rate of water is drained from the regulating tank.

In the water tank, when the amount of inflowing water is small and the water level drops and the open end of the air communication pipe is opened, the air supplied from the air supply pipe flows out from the open end, and the air pressure in the adjustment tank is reduced. Is equal to the atmospheric pressure, and the water to be treated equals the inflow amount flows out of the adjustment tank.

The submersion and opening of the air communication pipe are detected by the air pressure in the adjusting tank, and based on the result, the scum outflow pipe provided in the water tank is closed when the air communication pipe is submerged and set when opened. By providing the means for opening only the time, if the opening end of the air communication pipe is set above the lower end of the opening of the scum outflow pipe and near the opening in the vertical direction, the low water level at which the air communication pipe is opened At that time, that is, when the water surface is near the scum outflow pipe, the scum outflow pipe is opened for the set time, so that the scum existing near the water surface can be discharged from the water tank.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A constant flow discharging device according to an embodiment of the present invention will be described below with reference to FIG. Reference numeral 1 denotes a constant flow discharge device, which is provided downstream of the water tank 2 in which the inflow water amount Qi fluctuates greatly. The constant flow rate discharge device 1 includes a tank 3 having a closed structure, and is connected to the water tank 2 by an inflow pipe 4 that allows the water to be treated in the water tank 2 to flow into the tank 3 in a constantly submerged state at the bottom of the tank 3. I have. A weir plate 5 that partitions the inside of the tank into an upstream side and a downstream side is provided upright on the bottom surface in the tank 3 so that the water to be treated flowing from the inflow pipe 4 is allowed to flow to the downstream side at the upper end edge. Is configured. Downstream from the weir plate 5, there is provided an outflow pipe 6 for allowing overflow water that has passed over the weir plate 5 to flow out of the tank. One end of the pipe 6 opens below the upper end edge of the weir plate 5, The other end is open to the water outside the tank 3.

At the upper part of the tank 3, an air supply pipe 8 connected to an air source such as a compressor 7 outside the tank is provided.
A solenoid valve 9 for air and a pressure reducing valve 1 are provided in a line of the air supply pipe 8.
A flow control means such as 0 and a pressure gauge 11 are provided. An air communication pipe 12 is further provided at an upper portion of the tank 3, and one end 13 of the pipe 3 opens into the water tank 2. The air communication pipe 12 has an adjusting part 14 which expands and contracts up and down. The adjusting part 14 can change the set water level at one end 13 so as to be submerged above a certain water level in the water tank 2.

A scum outflow pipe 16 provided with an automatic valve 15 is provided above the communication pipe 4 in the water tank 2 with the tank 3. Based on the air pressure in the tank 3 measured by the pressure gauge 11, Scum outflow pipe 1 when air communication pipe 12 is submerged
6 is configured to be closed and to be opened only for a set time at the time of opening.

The operation of the above configuration will be described below.
The adjusting unit 14 adjusts the position of the open end 13 of the air communication pipe 12 to arbitrarily set the submersion depth ΔHi in the water tank 2, and also sets the solenoid valve 9 for air from the compressor 7 and the pressure reducing valve in the tank 3. While adjusting the flow rate at 10, air is supplied through the air supply pipe 8. Then, the air supply pipe 8
When the open end 13 of the air communication pipe 12 is submerged in a state where the air is pumped from the inside, the inside of the tank 3 is connected to the inflow pipe 4 which is always submerged and one end is opened in the tank and the other end is outside the tank. Is closed by the outflow pipe 6 opening into the water. At this time, the pressure at the position of the opening end 13 of the air communication pipe 12, that is, the pressure corresponding to the submersion depth ΔHi, is equal to the air pressure within the tank 3, that is, the pressure at the water surface in the tank 3. The water level is fixed, and the air supplied further flows out from the open end 13.

In this state, the flow rate Qi of the water to be treated into the water tank 2 fluctuates. For example, when the water level in the water tank 2 rises, the pressure at the position of the open end 13 of the air communication pipe 12 increases. However, since the air is continuously supplied from the air supply pipe 8, the air pressure in the tank 3 rises, and the pressure at the position of the open end 13 in the water tank 2 and the air pressure in the tank 3 balance. . As a result, the water level in the tank 3, that is, the overflow water level is kept constant.

When the water level in the water tank 2 drops,
Since the pressure at the position of the open end 13 of the air communication pipe 12 decreases and the air pressure in the tank 3 increases, air flows out from the open end 13 of the air communication pipe 12 and the open end 13 in the water tank 2 And the air pressure in the tank 3 is balanced. As a result, the level of the overflow water in the tank 3 is kept constant.

As described above, when the water level in the water tank 2 rises and falls, the water level of the overflow water in the tank 3 is kept constant, so that the water level of the overflow water and the upper edge of the weir plate 5 Is maintained constant, and drainage at a constant flow rate is performed.

On the other hand, in the water tank 2, when the inflow water amount Qi is small and the water level drops and the open end 13 of the air communication pipe 12 is opened, the air supplied from the air supply pipe 8 flows out from the open end 13. Since the air pressure in the tank 3 is equal to the atmospheric pressure, the inflow amount and the outflow amount of the water to be treated in the tank 3 are equal.

The submersion and opening of the air communication pipe 12 are
The air pressure in the tank 3 is detected by the pressure gauge 11 when it becomes atmospheric pressure, and based on the result, the automatic valve 15 of the scum outflow pipe 16 provided in the water tank 2 is operated. Then
The automatic valve 15 is opened and the scum outflow pipe 16 is opened only at a low water level at which the air communication pipe 12 is opened, that is, when the water surface is near the opening position of the scum outflow pipe 16, so that the vicinity of the water surface Existing scum can be drained from the aquarium 2. The automatic valve 15 can be opened only for a set time by a timer or the like.

Further, as described above, the open end 13
The overflowing water level in the tank 3 is determined so that the pressure corresponding to the submersion depth ΔHi and the air pressure at the surface of the overflowing water are equal, so that the adjusting unit 14 changes the position of the opening end 13,
The set discharge amount can be changed by changing the overflow water level in the tank 3.

[0023]

As described above, according to the present invention, since the inflow pipe and the outflow pipe are always open in the water in the adjusting tank, air is supplied from the air supply pipe under pressure and the opening of the air communication pipe is opened. When the end is submerged in the water tank, the adjustment tank is stably kept tightly closed. In such a closed state,
Since the pressure at the position of the opening end of the air communication pipe, that is, the pressure corresponding to the depth of submersion, is equal to the air pressure in the adjustment tank, the amount of water to be treated flowing into the water tank when air is supplied into the adjustment tank. When there is a change in the pressure, the air pressure in the adjusting tank is adjusted so as to balance the pressure at the open end of the air communication pipe in the water tank. As a result, the water level in the regulating tank, that is, the level of the overflow water is kept constant, and a constant flow rate of the water to be treated is discharged from the regulating tank.

Also, the overflow water level in the regulating tank is determined so that the pressure corresponding to the depth of submersion at the opening end of the water tank and the pressure on the surface of the overflow water in the regulating tank are equal. By changing the position of the opening end and changing the overflow water level in the adjustment tank, the set discharge amount can be easily changed.

Further, a scum outflow pipe not connected to the regulating tank is provided in the water tank, and the scum outflow pipe is opened and closed by detecting the opening of the air communication pipe which is an indicator of a decrease in the water level in the water tank. Therefore, the scum can be easily and reliably discharged from the water tank, and the scum does not accumulate in the adjusting tank unlike the related art.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an operation of a constant flow rate discharging device according to an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 constant flow discharge device 2 water tank 3 tank (adjustment tank) 4 inflow pipe 5 dam plate 6 outflow pipe 8 air supply pipe 12 air communication pipe 13 open end (one end) 14 adjustment section 16 scum outflow pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. A constant flow rate discharge device disposed downstream of a water tank having a large variation in the amount of inflow of water to be treated, wherein the constant flow rate discharge device communicates with the water tank in an airtight tank. An inflow pipe that allows the water to be treated to flow into the adjustment tank, and a weir that stands upright above the inflow pipe on the bottom surface of the adjustment tank, partitions the inside of the adjustment tank into an upstream side and a downstream side, and has an upper edge that forms an overflow weir. A plate, one end of which is opened below the upper end edge of the weir plate downstream of the weir plate in the regulating tank, and the other end is opened in water outside the regulating tank, and the overflow water flowing over the weir plate flows out of the regulating tank. A pipe, an air supply pipe connected to an air source outside the regulating tank, and an adjusting part that opens into the water tank at one end and expands and contracts vertically, and the open end is submerged at a certain water level or higher in the water tank. And a submersion and opening of the air communication pipe are adjusted as described above. Detected by air pressure in tank
A constant flow discharge device comprising means for closing the scum outflow pipe provided in the water tank when the air communication pipe is submerged and opening it only for a set time when the air communication pipe is opened, based on the result.