JP2000055000A - Pumping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pumping device that can pump underwater at any depth for improving soil. SOLUTION: This pumping device includes a first chamber 38 allowing inflow of water, a second chamber 40 into which compressed air is introduced, and a third chamber 42. The third chamber is connected to the first chamber 38 and the second chamber 40 so as to allow flow of the compressed air from the second chamber to the third chamber and water suction from the first chamber following this flow.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water pump.

[0002]

2. Description of the Related Art Conventionally, in order to suction groundwater for ground improvement and to pump it up to the ground, a pumping apparatus which combines a pumping pipe penetrating into the ground and a vacuum pump for applying a negative pressure to the pump is known. Used (well point method).

[0003] The depth at which groundwater is to be suctioned differs depending on the ground to be improved. However, since the conventional pumping apparatus has a maximum head of 10 m, it is not enough to pump groundwater at an arbitrary depth.

[0004]

SUMMARY OF THE INVENTION The main object of the present invention is to:
It is an object of the present invention to provide a pumping device capable of pumping groundwater at an arbitrary depth for improving the ground, and to provide a pumping device capable of pumping water at an arbitrary depth other than groundwater. To provide.

[0005]

According to the present invention, there is provided a water pumping apparatus comprising: a first chamber for permitting water to flow in; a second chamber for introducing compressed air; A second chamber connected to the first chamber and the second chamber to allow the flow of the compressed air from the first chamber to the third chamber and the suction of water from the first chamber accompanying the flow. 3 chambers.

In addition, a water pump according to the present invention is provided with a first pipe having a closed lower end and at least one opening provided in the closed lower end or the side wall, and is coaxially arranged in the first pipe. A second tube having a closed lower end and an open upper end, the open upper end of which is open between the opening of the first tube and the upper end thereof and the second tube. A compressed air supply tube having at least one opening. The compressed air supply pipe may extend coaxially with the first pipe and the second pipe.

[0007]

According to the present invention, groundwater flows into the first chamber when the pumping device is placed underground. When compressed air is introduced into the second chamber,
The compressed air flows from the second chamber to a third chamber. This air flow exerts a negative pressure on the first chamber. To this end, the groundwater in the first chamber is sucked into the air stream and is subdivided in the air stream into a number of water particles. The finely divided particles are transported in the third chamber using the air flow as a transport medium. The airflow and the water particles can be drawn from the third chamber to the ground to pump groundwater to the ground.

[0008] The capacity of pumping groundwater can be increased by increasing the magnitude of the velocity of the air flow;
The speed of the air flow is increased by increasing the pressure of the compressed air. Therefore, by changing the set pressure of the compressed air, groundwater at an arbitrary depth can be pumped to the ground.

The apparatus of the present invention moves water at an arbitrary depth position to a shallower depth position or water surface by disposing the device in water and supplying the compressed air into the second chamber. Can be done. For example, when the apparatus of the present invention is applied to a dam lake, low-oxygen-concentration water at the bottom of the lake is moved to the lake surface, whereby the lake water is circulated up and down, and the discharged water from the dam lake has a high oxygen concentration. It can be. Also, for example, when the apparatus of the present invention is applied to a sewage treatment plant, oxygen is supplied to sewage in a sedimentation tank, and
The sewage can be agitated.

[0010] In the pumping apparatus provided with the first pipe, the second pipe and the compressed air supply pipe, the first pipe and the second pipe coaxial with the first pipe are located between the first pipe and the second pipe. A first chamber, the second tube defining the second chamber, and the first tube between an upper end of the first tube and an open upper end of the second tube. Defines the third chamber. Compressed air is introduced into the second chamber defined by the second pipe via the compressed air supply pipe.

Water can flow into the first chamber through an opening in the first tube. In addition, the second
The open upper end of the tube allows the flow of compressed air from the second chamber to the third chamber above it,
In addition, a negative pressure caused by the generation of the flow of the compressed air (air flow) can be applied to the first chamber.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a pumping apparatus 10 according to the present invention includes a first pipe 12, a second pipe 14, and a supply pipe 16 for compressed air.

The pumping device 10 is provided for improving the ground 18.
It is installed underground. The installation of the pumping device 10 underground can be performed by penetrating the first pipe 12 into the ground 18.

The first pipe 12 extending vertically in the ground is
It has a closed lower end 20 and an upper end 22 that is open to the atmosphere on the ground. The closed lower end 20 of the first tube is tapered downward to reduce resistance to penetration into the ground 18.

The first tube 12 has at least one (a plurality in the illustrated example) openings 24 passing through the side wall thereof.
The opening 24 is preferably located near the lower end. The opening 24 can be provided in the closed lower end 20 instead of the illustrated example.

The second tube 14 has a closed lower end 28 and an open upper end 2
6 and has a smaller length dimension and a smaller outer diameter than the first tube 12. The second tube 14 is the first tube 12
And is coaxially disposed therein and fixed to the first tube 12, the open upper end 26 of which is above any opening 24 of the first tube 12, and the opening 24 and the upper end of the first tube 12 2
It is located between the two.

The compressed air supply pipe 16 extends coaxially with the first pipe 12 and the second pipe 14 and has an open lower end 30 in contact with a closed lower end 28 of the second pipe. And the open upper end 32 of the first tube 12
At the same height as the open upper end 22 of the air compressor, and is connected via a hose 34 to a compressed air supply source (not shown) including an air compressor, a receiver tank, and the like.

The supply pipe 16 has at least one (in the illustrated example, a plurality of) openings 36. The opening 36 is open to the internal space of the second tube 14. The illustrated opening 36 passes through the side wall of the supply pipe 16.

Accordingly, the apparatus 10 comprises a first chamber 38 having an annular cross-sectional shape defined by a first tube 12 and a second tube 14 therebetween, and a second tube 14 having an annular cross-sectional shape. A second chamber 40 defined therein and a second tube 14
, More specifically, between the upper end 26 of the second tube and the upper end 22 of the first tube, between which the first tube 12 and the supply tube 16 define an annular cross-sectional shape And a third chamber 42 having

The groundwater in the ground 18 (the groundwater level is denoted by reference numeral 43)
Indicated by ) Can flow into the first chamber 38 through the opening 24 of the first tube. The flow of the groundwater at this time is indicated by an arrow 44.

From the compressed air supply, through the hose 34, the supply tube 16 and the opening 36, a second chamber 40 is provided.
Can be supplied with compressed air. The flow of the supplied compressed air is indicated by an arrow 46.

The supply of compressed air to the second chamber 40 is continuous, preferably intermittent. For example, compressed air with a pressure of 10 to 30 kg / cm ² is fed 50 to 100 times /
Minute (for example, the injection time and the injection stop time of the compressed air are set to 0.1 seconds and 1.4 seconds, respectively)
It is ejected intermittently into the second chamber 40.

The compressed air supplied or jetted into the second chamber 40 flows upward in the second chamber 40 toward the third chamber 42 connected thereto.

Incidentally, the area of the annular cross section of the second chamber 40 is smaller than the area of the annular cross section of the third chamber 42 (for example, the cross sectional area of the second chamber 40: the third chamber 42). Cross-sectional area = 1: 4). From this, the flow (air flow) of the compressed air moves at a high speed from the second chamber 40 to the third chamber 42, and at this time, the region surrounded by the upper end 26 of the second pipe becomes a low pressure state. In addition, the surrounding area is at a higher pressure than this, and a pressure difference is generated between the two areas, and a negative pressure is applied to the first chamber 38. As a result, groundwater in the first chamber 38 is drawn into the airflow and subdivided into a number of water particles (eg, atomized particles) in the airflow. These large numbers of water particles rise in the third chamber 42 using the air flow as a transport medium (this flow is indicated by arrows 48).
Indicated by ), And is released to the atmosphere via its upper end 22.
As a result, groundwater is pumped to the ground.

If the first chamber 38 and the second chamber 40 are filled with groundwater before the supply of the compressed air, the compressed air is supplied to the second chamber 40 one or several times. The groundwater in the second chamber 40 is pushed up by the compressed air rising in the chamber, is further divided into small particles, and is conveyed in the third chamber 42 together with the flow of the compressed air. You.
Thereby, water is removed from the second chamber 40.

The device 10 of the present invention can be used for purposes other than groundwater suction and ground pumping for ground improvement.

For example, the device 10 is installed at the bottom of a dam lake such that its first tube 12 extends vertically and its open upper end opens above the lake surface.

As in the above ground improvement, the hose 34
When compressed air is sent into the second chamber 40 from the ground via the supply pipe 16 and the ground, water filling the second chamber 40 or the third chamber 42 becomes one of the compressed air.
Alternatively, the water is pushed out from the upper end of the first pipe 12 to the outside with several times of supply, and by the supply of the compressed air thereafter, the water near the lake bottom is flushed with the surface of the lake in the same manner as the pumping of groundwater in the ground improvement. Pumped up. As a result, the water near the lake bottom and the water near the lake surface circulate, and the water near the lake bottom, that is, the water discharged from the dam lake can have a high oxygen concentration.

The device 10 can be arranged such that the upper end of the first pipe 12 is located below the lake surface. In this case, the compressed air supplied to the second chamber 40 is
When flowing up the third chamber 42, the water and air around it are entrained and subdivided, so that the water and air are well stirred while ascending the third chamber 42,
It is then discharged from the upper end 22 of the first tube in the upper position.

The apparatus 10 is also disposed in a sedimentation tank in a sewage treatment plant, circulates sewage in the sedimentation tank, and has the opportunity of contacting oxygen with sewage in the same manner as when applied to the dam lake. Can be increased.

The pumping capacity of the groundwater or water depends on the cross-sectional area of the second chamber 40 and the cross-sectional area of the third chamber 42 depending on the magnitude of the velocity of the air flow,
The speed of the air flow depends on the magnitude of the pressure of the compressed air. Therefore, groundwater or water can be pumped to the ground from an arbitrary depth by changing the magnitude of the pressure of the compressed air.

The first chamber, the second chamber, and the third chamber are capable of causing and causing a flow of compressed air from the second chamber to the third chamber. Instead of the illustrated example, any other shape can be set as long as suction of water from the first chamber can be caused. For example,
The supply tube 16 may extend through the interior of the first tube 12 such that its open lower end extends through the closed lower end 28 of the second tube 14 and opens into the second tube.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a water pump according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Pumping device 12,14,16 1st pipe, 2nd pipe and compressed air supply pipe 24 1st pipe opening 36 supply pipe opening 38,40,42 1st chamber, 2nd chamber and 2nd chamber Three chambers

Continued on the front page (72) Inventor Naoto Hamada 1043 Oga Onigakubo, Tsukuba, Ibaraki Pref. Inside the Kumagaya Gumi Technical Research Institute (72) Inventor Norio Watanabe 1043 Oga Onigakubo, Tsukuba, Ibaraki Pref. In-house (72) Inventor Satoshi Kobayashi 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Tokyo, Kumagaya Gumi Co., Ltd. (72) Inventor Toshio Yamazaki 2-1-1 Honohara, Toyokawa-shi, Aichi Pref. Inventor Mitsuhiro Yoshida 589-10 Kishiyama, Kitahata-mura, Higashi-Matsuura-gun, Saga Prefecture F-term in YBM Kishiyama Plant (reference) 3H079 AA09 BB04 BB10 CC17 CC30 DD02 DD20 DD23 DD24

Claims (3)

[Claims] A first chamber for allowing inflow of water; a second chamber for introducing compressed air; and a third chamber, wherein the compression is performed from the second chamber to the third chamber. A pumping apparatus comprising: a third chamber connected to the first chamber and the second chamber so as to allow a flow of air and a suction of water from the first chamber accompanying the flow. 2. A first tube having a closed lower end and at least one opening formed in the closed lower end or the side wall, and a closed lower end and an open upper end disposed coaxially with the first tube. A second tube having a second tube having an open upper end located between the opening of the first tube and the upper end thereof;
A pump for supplying compressed air having at least one opening opening into the second pipe. 3. The water pump according to claim 1, wherein the compressed air supply pipe extends coaxially with the first pipe and the second pipe.