JP2003336246A - Water hammering relief device for pump gate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water hammering device for a pump gate mitigating water hammering waves caused by pressure variation of the pump gate when stopping a pump. <P>SOLUTION: A sure pipe (10) is fixed to a gate door body (3) of a cut-off gate (2) and the lower end part (10a) of a surge pipe (10) is opened to the downstream waterway (1b) near a submerged pump (4). The upper half part of the surge pipe (10) is formed of a bellows cylinder (11) and its upper end (11a) is supported in a frame base (7) of the cut-off gate (2). The pressure energy by the water hammering waves in stopping of the pump is released to the surge pipe (10) to convert to the kinetic energy and relax the impulse. Hence, the burden of the delivery pipe of the downstream waterway (1b) is reduced from the water hammering waves caused by the hydraulic variation, breakage and collapse of the delivery pipes can be prevented. Further, if the gate door body (3) of the cut-off gate (2) is moved up or down, the bellows cylinder (11) extends or contracts and the surge pipe (10) does not obstruct the rising or falling movement of the gate door body (3). <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump gate in which a submersible pump is attached to a gate door of a water shutoff gate to perform forced drainage in a closed state. More specifically, the present invention relates to a water hammer wave caused by a pressure fluctuation when the pump is stopped. It relates to a water hammer mitigation device for a pump gate to mitigate.

[0002]

2. Description of the Related Art Conventionally, a pump gate has been well known in which a submersible pump is installed in a gate door body supported by a sluice for irrigation and intake so as to be able to move up and down. As shown in FIG. 4, when the pump gate 5 is installed on the back of the river, the dust remover 14 is disposed in the upstream water channel 1a of the water stop gate 2 and the reinforced concrete is used in the downstream water channel 1b near the water stop gate 2. The pressure regulating water tank 15 is constructed downstream of the pump gate 5 to absorb the water hammer wave due to the pressure fluctuation generated by the water hammer action when the pump is stopped, and reduce the influence on the discharge gutter pipe 12.

[0003]

However, it is difficult to secure an installation space for the pressure regulating water tank to be installed in the pump gate facility in which a large facility site cannot be secured, and the pressure regulating water tank causes an increase in construction cost. An object of the present invention is to provide a water hammer mitigation device for a pump gate that eliminates a pressure regulating water tank that alleviates pressure fluctuations and absorbs a shock caused by a water hammer wave when the pump is stopped.

[0004]

In order to achieve the above object, a submersible pump is provided on a gate door body supported by a water stop gate provided in a water channel so as to be able to move up and down, and is forced in a closed state of the gate door body. In a drainage pump gate, a surge pipe is attached to the gate door, the lower end of this surge pipe is opened downstream near the submersible pump, and the upper end is released above the gate door. The pressure energy due to the water hammer wave when the pump is stopped is released into the surge pipe to be converted into kinetic energy to absorb the shock. It is possible to reduce the load on the discharge gutter pipe in the downstream waterway from the water hammer wave due to fluctuations in water pressure, and prevent cracks and crushing of the discharge gutter pipe.

The upper half of the surge pipe is formed of a bellows tube, or the upper half of the surge pipe is formed of a swivel joint, and the upper end of the surge pipe is supported by a stand for a water shutoff gate. Even if the gate door body of the water stop gate is moved up and down, the bellows cylinder and the swivel joint expand and contract, and the surge pipe does not hinder the movement of the gate door body. Further, the surge pipe fixed to the gate door body does not interfere with the water channel that raises the gate door body.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The water hammer mitigation device for a pump gate according to the present invention is configured as described above, and forced drainage is performed from the upstream side water channel to the downstream side water channel with the water stop gate closed, and the upstream side. When the water level in the waterway drops or the drainage is completed and the operation of the submersible pump is stopped, a water hammer wave is generated due to a sudden pressure change. The water that has undergone fluctuations in water pressure on the drainage side flows into the surge pipe fixed to the gate door body, and rises in the surge pipe whose upper end is open. The pressure energy of the water hammer wave due to pressure fluctuation is converted to kinetic energy to reduce the shock, and the load of the discharge gutter pipe and valve of the downstream side water channel is reduced from the water hammer wave due to the abrupt pressure fluctuation, and the discharge gutter pipe's Prevent cracking and crushing.

[0007]

Embodiments of the present invention will be described in detail with reference to the drawings. First, FIGS. 1 and 2 are pump gates arranged in a water channel, in which a water stop gate 2 is installed in the water channel 1. A pump gate 5 in which a submersible pump 4 is horizontally supported is provided on a gate door body 3 of the water gate 2. With the pump gate 5 closed, the upstream water channel 1a is forcibly drained to the downstream water channel 1b. Reference numeral 6 is a flap valve provided on the drain side of the submersible pump 4. A drive unit 8 is provided on a mount 7 for installing the switch of the water shutoff gate 2, and a pin rack rod 9 interlockingly connected to the drive unit 8 is suspended from the mount 7. The lower end of the pin rack rod 9 is connected to the gate door body 3, and the drive device 8 moves the pump gate 5 up and down.

As shown in FIGS. 1 and 2, the gate door body 3
A surge pipe 10 is fixedly attached to the surge pipe 10. The surge pipe 10 penetrates the upper end portion of the gate door body 3 and has a lower end portion which is opened at a lower end portion 10a in a downstream side water passage 1b near the submersible pump 4. . The upper half of the surge pipe 10 is composed of an accordion tube 11, and the accordion tube 11 is supported on the mount of the water stop gate 2 to open the upper end 11a. When the gate door body 3 is moved up and down, the bellows tube 11 in the upper half of the surge pipe 10
And expand and contract the gate door 3 and surge pipe 10
Can be raised and lowered. When the water stop gate 2 is closed, forced drainage is performed from the upstream side water channel 1a to the downstream side water channel 1b, and water that has undergone a sudden pressure change in the downstream side water channel 1b that occurs when the submersible pump 4 stops operating is supplied to the gate door. It is made to flow into the surge pipe 10 fixed to the body 3.
By raising the surge pipe 10 to convert the pressure energy of the water hammer wave due to the pressure fluctuation into kinetic energy to reduce the impact, and reduce the load of the discharge gutter pipe 12 and the valve of the downstream side water channel 1b from the water hammer wave, Prevents cracks and crushing of the discharge gutter pipe 12 and the like.

FIG. 3 shows another embodiment of the pump gate. Instead of the bellows tube 11 of the surge pipe 10, a swivel joint 13 is provided in the upper half portion of the surge pipe 10 and the upper end portion thereof is stopped. The water gate 2 is supported on a pedestal 7 to release the upper end portion 13a. When the gate door body 3 is moved up and down, the swivel joint 13 in the upper half of the surge pipe 10 is expanded and contracted. In addition, a communication pipe is connected to the upper end portion 13a of the bellows tube 11 which is supported by the pedestal 7 and released, or the upper end portion 13a of the swivel joint 13 to be released to the upstream water channel 1a, and the surge pipe 10 is opened by the water hammer wave. The rising scattered water may be discharged to the upstream water channel 1a.

[0010]

The present invention is configured as described above, abolishes the conventional pressure regulating water tank, reduces the load of the discharge gutter pipe of the downstream side water channel from the water hammer wave due to water pressure fluctuation, and discharges the water. It can prevent cracks and crushing of the gutter pipe. That is, in the conventional pump gate in which the pressure regulating water tank is installed in the downstream side water channel, it is necessary to secure the installation space for the pressure regulating water tank to be installed side by side and increase the construction cost. Is
The surge pipe was attached to the gate door, the lower end of this surge pipe was opened to the downstream side near the submersible pump, and the upper end was released above the gate door. The pressure energy due to is released to the surge pipe to be converted into kinetic energy, and the shock can be absorbed.

Then, the upper half of the surge pipe is formed of a bellows tube, or the upper half of the surge pipe is formed of a swivel joint, and the upper end of the surge pipe is supported by a stand for a water stop gate. Even if the gate door body of the water stop gate is moved up and down, the bellows cylinder and the swivel joint expand and contract, and the surge pipe does not hinder the movement of the gate door body. Further, the surge pipe fixed to the gate door body does not interfere with the water channel that raises the gate door body.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view of a pump gate provided with a water hammer mitigation device according to the present invention.

FIG. 2 is likewise a front view of a pump gate provided with a water hammer mitigation device.

FIG. 3 is a front view of a pump gate having a water hammer mitigating device according to another embodiment of the present invention.

FIG. 4 is a side view of pump equipment having a conventional pump gate.

[Explanation of symbols]

1 waterway 2 water stop gate 3 gate door 5 pump gates 7 stand 10 surge pipe 10a lower end 11 bellows tube 11a upper end 13 swivel joint 13a upper end

Claims (3)

[Claims] 1. A submersible pump is installed in a gate door body (3) supported by a water stop gate (2) provided in a water channel (1) so as to be able to move up and down, and is forced when the gate door body (3) is closed. In the pump gate (5) for draining, the surge pipe (10) is fixed to the gate door body (3), and the surge pipe (1)
The lower end (10a) of (0) is opened to the downstream water channel (1b) near the submersible pump (5), and the upper end (11a, 13a) is opened.
A water hammer mitigation device for a pump gate, which is opened above the gate door body (3). 2. The surge pipe (10) has an upper half portion formed of a bellows tube (11), and an upper end portion (11a) of which is supported on a stand (7) of the water stop gate (2). The water hammer mitigation device for a pump gate according to claim 1. 3. The upper half of the surge pipe (10) is composed of a swivel joint (13), and the upper end (13) thereof.
The water hammer mitigation device for a pump gate according to claim 1, wherein a) is supported on a stand (7) of the water stop gate (2).