JPS609616B2 - Groundwater ``recharging'' equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a groundwater drip cultivation system equipped with a submersible motor pump capable of both injecting and pumping water into a well.

Conventionally, as shown in FIG. 3, an injection pipe 15 and a pumping pipe 1 equipped with a submersible motor pump 10 at the lower end are installed in parallel into a well 2,
Water is injected through the injection pipe 15 and permeates into the ground from the well wall, and when the injection efficiency decreases due to clogging of the strainer 13 and the surrounding soil and the water level rises, the submersible motor pump 1
0 operation, water is pumped up through the pumping pipe 1 and the strainer 1
3 and the surrounding soil was backwashed.

Since the well has two pipes, the lift pipe 1 and the injection pipe 15, which are arranged in parallel, the diameter of the well inevitably becomes large, which has the disadvantage that drilling and maintenance of the well requires a great deal of effort and expense.

Therefore, as shown in FIG. 4, a drip cultivation system has been proposed in which a pumping pipe I is housed in a main pipe 19, so that it can be used even in wells with a narrow diameter.

(Special Publication No. 50-120001). Part of this is a water-reducing pipe.
The lifting pipe 1 which has become a part a is accommodated in a main pipe 19, and an opening 11 is opened at the end of the lifting pipe 1 that emerges from the lower end of the main pipe 19, and a submersible pump 10 is connected thereto. A shielding plate 16 for opening and closing the opening 11 is attached to the lower end of a valve shaft 18 that penetrates the upper end of the lifting pipe 1, and a discharge pipe 6 with valves 3 and 4 is attached to the upper end of the main pipe 19 and the lifting pipe 1, respectively. An injection pipe 5 is connected thereto.

The above-mentioned drip cultivation apparatus was able to pump water and inject drip protection water by switching the valves 3 and 4 and opening and closing the opening 11.

However, it has a double pipe structure in which the water feeding pipe 1 is accommodated in the main pipe 19, and the valve shaft 18 for opening and closing the shielding plate 16 must be passed through the water feeding pipe 1, making the structure complicated. The outer diameter of the device also increases, making the entire device expensive.

In addition, each time you switch between pumping and injection, you can manually close the shielding plate 16.
It was necessary to open and close the door, which required time and effort.

The present invention improves a part of the pumping pipe and the submersible motor pump, so that both injection and pumping can be performed with one pipe, and the structure is simple and inexpensive, and the device is easy to operate. The purpose is to provide.

A lifting pipe 1 is laid vertically into a well 2, and valves 3 and 4 are installed at the upper end.
The injection pipe 5 and the discharge pipe 6 are connected via.

A deep well type submersible motor pump 1 is provided at the lower end of the lift pipe 1, as is well known, and has a pump section 8 having a suction port 7 and an impeller 81, and a motor section 9 connected to and driven by the impeller.
0 is installed.

Further, an opening 11 is provided in the upper part of the submersible motor pump 10 or in the wall of the lifting pipe 1, and an opening 11 is normally left open on the inner or outer surface of the lifting pipe 1 opposite to the opening 1. During operation of the motor section 9, a switchgear 12 is provided to shield the barrier hole 11.The switchgear 12 has a shielding plate 16 built into the submersible pump and is slidably disposed along the barrier hole 11 as shown in FIG. The shielding plate 1
6 can be opened and closed by sliding it against the check hole 11.

The injection pipe 5 and the discharge pipe 6 at the upper end of the pumping pipe 1 are configured so that either one of them passes through the pumping pipe 1' by switching the valves 3 and 4. A water level detector 14 is disposed at a predetermined height of , and the valves 3 and 4 are operated.

In addition, "the barrier opening/closing device 12 of the lift pipe 1 is equipped with a water level detector 14.
It can also be operated by connecting to. However, at the time of injection, the submersible motor pump 10 is stopped, the valve 4 is opened, and the injection pipe 5 is opened.
At the same time, the opening 11 is opened by driving the opening/closing device 12, and the water flows out from the barrier hole 11 into the well and permeates into the ground around the well, thereby controlling groundwater.

At this time, since a check valve 17 is normally provided in the waterway of the submersible motor pump 10, the injected water will not flow into the pump section and cause the impeller and motor section to rotate in the opposite direction. If the injection efficiency decreases due to clogging or the like due to continued injection, the water level in the well will rise, so the valves 3,
4 to pass the discharge pipe 6 through the pumping pipe 1,
Driving the submersible motor pump 10 and the opening/closing device 12,
At the same time, the opening 11 is closed, water is allowed to flow in from the suction port 7, water is discharged through the pumping pipe 1 and the discharge pipe 6, and the water is discharged through the strainer 1.
3 and backwashing the well walls and surrounding wells.

As described above, the present invention can perform both pumping and water injection using the pumping pipe 1, so there is no need to install a separate water injection pipe for water injection as in the past, and it is possible to perform both pumping and water injection using the pumping pipe 1. Equipment costs are reduced, and the inner diameter of the well to be dug only needs to be small enough to install the pumping pipe 1, making well drilling and maintenance management easier.

Furthermore, since the shielding plate 16 automatically operates to open and close the aperture 11, it exhibits many advantages, such as saving time and effort in operating the shielding plate.

[Brief explanation of drawings]

FIG. 1 is a front view of the device of the present invention, FIG. 2 is an enlarged sectional view of the main part, FIG. 3 is a front view of a conventional device, and FIG. 4 is a sectional view of another conventional device. 1... Lifting pipe, 2... Well, 5... Injection pipe, 6...
Discharge pipe, 10...Deep well type submersible motor pump, 11...
...Opening hole, 12...Switching device. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 An opening is provided in the pipe wall of a lift pipe with a submersible motor pump attached to the lower end, and an opening/closing device is provided to open and close the opening, and a discharge pipe and an injection pipe are connected to the upper end of the lift pipe, The device connects a shielding plate 16 that slides along the aperture 11 to open and close the aperture to a backflow prevention valve 17 provided on a submersible pump 9, and moves so that the backflow prevention valve 17 is opened by water pressure when the submersible pump is operated. A groundwater recharge device characterized in that a shielding plate 16 closes the opening 11 in conjunction with the above.