JPH0673778A - Pump machine field - Google Patents

Abstract

PURPOSE:To lower the net head of a pump in response to the water level of a discharged water tank. CONSTITUTION:In an underground pump field 1, water flowing from an underground river 2 to a suction watercourse 3 is pumped up by a pump 4, and overflows a control weir 7 through a delivery pipe 6 and flows into a discharged water tank 8. The control weir 7 is formed in a gate type, vertical height can be adjusted, and the gross head of the pump 4 can be lowered in response to the water level of the discharged water tank 8. The control weir 7 is adjusted to a position higher than the water level of the discharged water tank 8, thus also preventing a back flow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground pumping station, and more particularly to a pumping station suitable for reducing the actual pump head.

[0002]

2. Description of the Related Art In cities where the living environment has changed drastically due to recent national land development and residential land development, flooding of rivers and flooding of rivers have become problems.

In view of the fact that land acquisition in urban areas is difficult, an underground river will be established, an underground pumping station will be constructed near the beach on the downstream side, and flood water will be pumped from the underground river by an underground pump and discharged to the sea. An underground pump station is being planned.

A known example of such an underground pumping station is Japanese Patent Application No. 2-330511, in which an overflow weir for preventing backflow of discharge water is provided above the pump discharge pipe communicating with the discharge water tank on the ground surface. Is disclosed. The height of this overflow weir is fixed above the maximum water level of the discharge water tank in order to prevent backflow in any case.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Since the overflow weir disclosed in JP-A-330511 is fixed higher than the maximum water level in the discharge water tank, water is pumped over the overflow weir even if the water level in the discharge water tank is at the bottom depending on the degree of precipitation. The actual pump head is required. As the design value of the pump head, the maximum water level of the discharge water tank must be taken into consideration, but when the water level of the discharge water tank is low, it is not necessary to have a head that exceeds the maximum water level of the discharge water tank, and the power to drive the pump is wasted. I am consuming. Therefore, there is a demand for a solution that allows the pump to operate at an actual head with consideration for the water level in the discharge water tank.

An object of the present invention is to reduce the actual pump head according to the water level in the discharge water tank.

[0007]

[Means for Solving the Problems] In the pumping station equipped with a pump for sucking water from the ground water channel and discharging it into a discharge tank on the surface of the earth, the height is adjusted above the discharge pipe connecting the pump and the discharge tank. This is achieved by providing a free adjusting weir.

[0008] In the pumping station equipped with a pump for sucking the water in the underground waterway and discharging it into the discharge tank on the surface of the earth, the above-mentioned object is to provide a variable height adjusting weir provided above the discharge pipe connecting the pump and the discharge tank. It is achieved by having a water level gauge that detects the water level of the discharge water tank and a control device that controls the height of the node weir to be higher than the water level detected by the water level gauge.

[0009]

According to the above structure, the height of the adjusting weir is adjustable above the discharge pipe connecting the pump and the discharge water tank, and the height of the adjusting weir is determined to be higher than the water level of the discharge water tank. The actual pump head can be lowered according to the water level of

[0010]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view of an underground pumping station according to an embodiment of the present invention.

In the figure, 1 is an underground pumping station, 2 is an underground river having a large depth by an underground water channel, and 3 is a suction channel connected to the underground river 2 and provided at the bottom of the underground pumping station 1. 4 is a pump, 5 is a motor for driving the pump, 6 is a pump discharge pipe, and these discharge pipes 6 are gathered from the discharge part of each pump 4 to the central part in the underground pumping station 1 and to the basement wall of the central part. It is piped in the core wall 12a. 8 is a discharge water tank provided near the ground above the underground pumping station 1, and discharge pipe 6 is
As shown in FIG. 1, it communicates with the discharge water tank 8. 7 is a feature of the present invention, which is an adjusting weir arranged above the discharge pipe 6 (outlet of the discharge pipe), and adjusts the water level not shown in the figure for detecting the water level in the discharge water tank 8 and the water level detected by this water level gauge. By a control device (not shown) that controls the height of the weir 7 to be high,
The height of the adjusting weir 7 is kept higher than the water level of the discharge water tank 8. Reference numeral 9 is a ground discharge water channel connected to the discharge water tank 8, which is a river, a canal or the like that naturally flows into the sea.

Reference numeral 10 is a basement wall constituting the basement pump station 1, and reference numerals 11 and 12 are basements.

The basement 11 is formed in an annular shape above the pump 4 and the motor 5, and 15 is an overhead traveling crane disposed in the annular basement 11. The overhead traveling crane 15 is used for installation and maintenance of the on-site equipment such as the pump and the motor. An annular basement 12 side on the side of the intermediate partition 12a is a control management room 16 in which control devices are arranged.

Reference numeral 13 is a gate provided in each suction pipe portion leading from the suction flow path 3 to the pump 4, and 14 is a basement room 1.
2 is a gate driving unit.

Next, the function of the underground pumping station will be described.

Outflow of water during precipitation or excess running water flows from the underground river 2 into the underground suction passage 3. At this time, the number of pumps 4 to be operated by opening and closing the gate 13 is determined according to the flow rate flowing from the underground river 2. The operation control of the pump 4 is performed in the control management room 16.

The pump 4 sucks water from the suction passage 3 and discharges it into the discharge pipe 6. The pumped water flows over the adjusting weir 7, flows into the discharge water tank 8, and is discharged through the discharge water channel 9.

The adjusting weir 7 can be adjusted up and down in the form of a gate,
It can be adjusted according to the water level in the discharge water tank 8. The adjusting weir 7 can be adjusted by an automatic control device according to the detection value of a sensor that detects the water level, for example, an ultrasonic water level sensor that detects the water level according to the time of reflection of ultrasonic waves from the water surface.

By adjusting the adjusting weir 7 in this way, the actual head of the pump can be lowered as compared with the conventional fixed overflow weir. Of course, since the adjusting weir 7 is constantly adjusted to be higher than the water level in the discharge water tank 8, backflow is prevented.

FIG. 2 is a vertical sectional view of an underground pumping station according to another embodiment of the present invention.

In this figure, the adjusting weir 7 is centered on a fulcrum,
It is possible to rotate within a certain angle range, rotate the adjusting weir 7, and adjust its height according to the water level of the discharge water tank 8.

[0023]

According to the present invention, the height of the adjusting weir is adjusted according to the water level in the discharge water tank to reduce the actual head of the pump,
The effect of reducing the load on the pump is obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an underground pumping station according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an underground pumping station according to another embodiment of the present invention.

[Explanation of symbols]

 1 Underground Pump Station 2 Underground River 3 Suction Channel 4 Pump 5 Drive Motor 6 Pump Discharge Pipe 7 Control Weir 8 Discharge Water Tank 9 Discharge Channel 10 Basement Wall 11 Basement 12 Basement 12a Core Wall 13 Suction Pipe Gate 14 Gate Drive Unit 15 Overhead traveling crane 16 Control room

Claims (2)

[Claims] 1. In a pumping station equipped with a pump for sucking water from a groundwater channel into a discharge water tank on the surface of the earth, a height adjusting adjustable weir is provided above a discharge pipe connecting the pump and the discharge water tank. A pumping station. 2. A pumping station equipped with a pump for sucking in water from an underground waterway and discharging it into a discharge water tank on the surface of the earth, and a variable height adjusting weir provided above a discharge pipe connecting the pump and the discharge water tank, A pumping station, comprising: a water level gauge for detecting the water level of the discharge water tank; and a control device for controlling the height of the node weir to be higher than the water level detected by the water level gauge.