JPH0362913B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compound pump for pumping two types of water (generally fresh water and salt water) in two different strata in one well.

In the world's arid regions, fresh water often stagnates in the upper layers of the earth, and salt water stagnates in the lower layers. In this case, if the fresh water in the upper layer is continued to be pumped up from the well, the thickness of this water retention layer will decrease, and the salt water in the lower layer will rise, eventually resulting in the pumping of salt water from the well. Salt water is not only unsuitable for drinking, but also poses a serious problem when used for irrigation, causing crops to wither. To solve this problem, there are two methods: pumping fresh water and salt water from two wells at the same time, one shallow and one deep, or installing two pumps in one well, one in shallow and one deep. The latter means that the cost of drilling a well will be nearly twice as much, and the latter will increase the cost due to the larger diameter of the well.
Inserting a real pump is difficult in practice and is rarely practiced.

The present invention solves the above situation.

Conventionally, as shown in Fig. 1, in a geological formation in which a fresh water aquifer 1 is distributed in the upper layer and a salt water aquifer 2 in the lower layer, there is a method to pump fresh water and salt water separately from one well 6. , the lower part has an inner diameter that accommodates one pump 3, and the upper part has a large diameter in the middle so that another pump 4 can fit into the casing 5;
Separate pumps 4 and 3 are provided at the top and bottom as shown in the diagram.
were installed, and fresh water and salt water were pumped up separately from separate pumping pipes 41 and 31, respectively.

Therefore, it was necessary to construct the well 6 with a large hole diameter, and when the pumps 4 and 3 were inserted into the casing 5, there was a risk that the pumps would get stuck on the way, making it especially difficult to insert the second pump 4.

The present invention has been made in view of the above-mentioned circumstances, and includes an upper layer water pump and a lower layer water pump arranged above and below the casing, and the upper layer water and the lower layer water are pumped above ground through separate passages within the casing. The purpose of the present invention is to provide a compound pump capable of pumping water.

In order to achieve such an object, the present invention has a structure in which a casing main body is constructed by penetrating into a well, an upper casing having an upper screen disposed at the lower end, and a lower casing having an upper screen disposed at the lower end.・Inside the lower casing, a lower water pump and a connected lower water pump are installed, and in the upper casing, a lower water pump is installed that connects the lower end to the lower water pump. A lower layer water passage is formed between the lower layer water inner pipe, and a lower layer water outlet is provided by extending the inner and outer pipes to the ground, and the lower end of the lower layer water inner pipe communicates with the outer pipe and the lower layer water passage. An upper layer water intake is provided across the water passage and shielded from the lower layer water passage, and an upper layer water pump is installed near the upper layer water intake and at the bottom of the inner pipe, and is connected to the pump and installed inside the inner pipe. The upper layer water pumping pipe is extended to the ground to provide an upper layer water discharge port.

Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings. Figures 2A and 2B are vertical cross-sectional views of a compound pump according to an embodiment of the present invention, excluding the vicinity of the above-ground part. FIG. 4 is a sectional view taken along line AA in FIG. 2, FIG. 4 is a sectional view taken along line BB in FIG. 2, and FIG. be.

7 is a well, in which a fresh water aquifer 71 is located in the upper layer, and a salt water aquifer 72 is separately distributed in the lower layer. Well 7 above
A cylindrical casing main body 8 is inserted and fixed therein, with an upper casing 81 at the top and a lower casing 82 at the bottom. An upper screen 811 and a lower screen 821 are provided with water holes 811a and 821a at the lower ends of the upper casing 81 and the lower casing 82, respectively.
is provided. Inside the lower casing 82, a salt water pump (lower water pump) 10 and a salt water pumping pipe (lower water pump) 12 are disposed in the lower part, and the upper end is connected to the salt water outer pipe (lower water pump) inside the upper casing 81. It is connected to the water outer pipe) 121 by a flange 12a or the like.

The salt water outer pipe (lower water outer pipe) 121 and the inner salt water inner pipe (lower water inner pipe) 122 form a salt water passage (lower water passage) d, and the salt water outer pipe 121 and the salt water inner pipe 122 are connected above ground. A salt water discharge port (lower layer water discharge port) 121a is provided extending to the bottom. At the lower end of the inner salt water pipe 122, a fresh water intake (upper water intake) 12 is connected to the outer salt water pipe 121, crosses the salt water passage (lower water passage) d, and is shielded from the salt water passage d.
3 is provided, and a fresh water pump (lower layer water pump) is provided in the salt water inner pipe 122 above the fresh water intake port 123.
9 is arranged, and a fresh water pumping pipe 11 is connected to the fresh water pump 9 and extended to the ground within the salt water inner pipe 122,
A fresh water outlet (upper layer water outlet) 111 is provided on the ground. The above-ground end of the salt water inner pipe 122 is connected to the salt water outer pipe 12.
1 and is closed by a lid 122b via a flange 122a.

When the salt water pump 10 is operated, the salt water aquifer 72
Therefore, the salt water flowing out into the well 7 passes through the water passage hole 821a of the lower screen 821, and is supplied to the salt water pump 10.
The salt water is sucked into the strainer 101, and pumped to the ground by the salt water pump 10 through the salt water lifting pipe 12, the salt water passage d, and the salt water discharge port 121a. When the fresh water pump 9 is operated, the fresh water flowing out from the fresh water aquifer 71 into the well 7 passes through the water passage hole 811a of the upper screen 811, passes through the fresh water intake port 123, and is sucked into the strainer 91 of the fresh water pump 9, and the fresh water flows into the well 7. The pump 9 pumps water to the ground via a fresh water pumping pipe 11 and a fresh water outlet 111.

As explained in detail above, according to the present invention,
(b) Since the upper and lower water pumps are arranged on the same axis line at the top and bottom, and the lifting pipe is integrated with the above pump, separate pumps with separate lifting pipes for the upper and lower layers are installed. Compared to installing a pump, the hole diameter of the well is small, (b) the pump is easy to install, and (c) equipment costs are low.

[Brief explanation of drawings]

FIG. 1 is a layout diagram of a conventional pump device, FIG. A cross section taken along line E-E is shown, and Fig. 3 shows the second
FIG. 4 is a cross-sectional view taken along line BB in FIG. 2, and FIG. 5 is a vertical cross-sectional view of the vicinity of the above-ground part of a compound pump, showing an embodiment of the present invention. 7... Well, 71... Fresh water aquifer, 72... Salt water aquifer, 8... Casing body, 81... Upper casing, 82... Lower casing, 811...
...Top screen, 821...Bottom screen,
811a, 821a... Water hole, 9... Fresh water pump, 10... Salt water pump, 11... Fresh water pumping pipe,
12...Saltwater pumping pipe, 12a...Flange, 12
1... Salt water outer pipe, 122... Salt water inner pipe, 122a
...flange, 122b...lid, C...fresh water passage, d...salt water passage, 121a...salt water outlet,
111... Fresh water outlet, 123... Fresh water intake.

Claims (1)

[Claims] 1. A pump for pumping water of two different types separately from one well in a stratum where two different types of water are distributed separately in the upper and lower layers, with an upper screen at the lower end. The casing body, which consists of an upper casing with a lower screen on the top and a lower casing with a lower screen on the lower end, is inserted and fixed into the well, and inside the lower casing there is a lower water pump and a lower layer connected to it. A water lifting pipe is provided, and a lower water outer pipe is provided in the upper casing, the lower end of which is connected to the lower water pumping pipe, and a lower water passage is formed between the inner lower water pipe and the inner pipe.・The outer pipe is extended to the ground to provide a lower layer water discharge port, and the lower end of the lower layer inner pipe is provided with an upper layer water intake port that communicates with the outer pipe, crosses the lower layer water passage, and is shielded from the lower layer water passage. , An upper layer water pump was installed at the bottom of the inner pipe located near the upper layer water intake, and an upper layer water pumping pipe was connected to the pump and extended to the ground within the inner pipe to provide an upper layer water discharge port. When the lower layer water pump is operating, the lower layer water passes through the water hole in the lower screen, and is pumped to the ground via the lower layer water pump, the lower layer water pumping pipe, the lower layer water passage, and the lower layer water discharge port, and when the upper layer water pump is operating, the lower layer water is pumped to the ground through the water hole in the lower screen. A compound pump characterized in that upper layer water passes through a water hole in a screen and is pumped to the ground via an upper layer water intake, an upper layer water pump, an upper layer water pumping pipe, and an upper layer water discharge port.