JP6998593B2 - Groundwater traffic device - Google Patents

Description

The present invention relates to a groundwater reciprocating device that allows groundwater used as a heat source (including a hot heat source and a cold heat source) for snowmelt, an air conditioner, a refrigerator, etc. to be reciprocated between the groundwater vein and the ground.

Conventionally, in this type of invention, for example, as described in Patent Document 1, a vertical casing having a strainer portion (slit) at a predetermined height position of a peripheral wall and a suction port in the casing are provided above. An outbound pipe that is extended to the ground equipment and connected to the above-ground equipment, a return pipe that returns from the ground equipment to the inside of the casing and has a discharge port below the suction port of the outbound pipe, and a return pipe that is below the outbound pipe and in the middle of the return pipe. There is an invention provided with a water-impervious pipe that is provided and vertically divides the space inside the casing so that the casing is embedded up to a water-bearing layer in the ground.
In this conventional technique, the ground water flowing in from the slit in the peripheral wall of the casing is sent to the above-ground equipment by the outbound pipe, and the water returned from the above-ground equipment to the inside of the casing by the return pipe is sent from the discharge port of the return pipe under the impermeable pipe into the casing. The water is discharged so that the water in the casing is returned to the water-bearing layer through the strainer portion of the peripheral wall of the impermeable pipe.

Japanese Unexamined Patent Publication No. 6-228928

However, according to the above-mentioned prior art, the strainer portion is clogged with the earth and sand of the aquifer, and the space inside the casing is filled with the fine earth and sand of the aquifer under the impermeable pipe, so that the outlet of the return pipe is discharged. The water discharged from the casing may not be smoothly discharged to the outside of the casing.

In view of such problems, the present invention has the following configurations.
A vertical casing, a first pipe extending from the opening located inside the casing to the outside of the upper casing, and a pipe entering the casing from the outside of the casing and extending downward to the lower side of the first pipe. It is provided with a second pipe having an opening in the first pipe and an impermeable portion that vertically divides the space in the casing at a height position between the opening of the first pipe and the opening of the second pipe. In the underground water return device, one of the pipe and the second pipe is an outward pipe for transporting water from the inside of the casing to the outside of the casing, and the other is a return pipe for returning water from the outside of the casing to the inside of the casing. The peripheral wall is provided with a strainer portion that allows water to pass above and below the impermeable portion, and the return pipe is a downward pipe extending downward and laterally from the peripheral wall of the downward pipe. A groundwater reciprocating device characterized by having a protruding pipe having an opening as a discharge port at its tip.

Since the present invention is configured as described above, the water discharged from the return pipe can be smoothly discharged to the aquifer.

It is a structural drawing of the state in which an example of the groundwater return device which concerns on this invention is buried in the ground, and a part of a casing is cut out to show an internal structure. It is an enlarged cross-sectional view of a main part in a state where the groundwater return device is buried in the ground. It is a cross-sectional view which cut the return pipe in the groundwater return device at the discharge port part. It is a cross-sectional view which cut the return pipe at the discharge port part about another example of the groundwater return device which concerns on this invention. It is an enlarged view of the main part which shows the other example of the groundwater return device which concerns on this invention. It is a cross-sectional view which cut the return pipe at the discharge port part about another example of the groundwater return device.

Next, a mode for carrying out the present invention will be described in detail with reference to the drawings.
1 to 3 show an example of the groundwater reciprocating device according to the present invention.
As shown in FIG. 1, the groundwater transfer device 1 is embedded in the ground having an impermeable layer and an aquifer. Aquifers are water-containing formations formed between upper and lower impermeable layers, such as porous permeable unsolidified formations such as sand layers and gravel layers, or cracked lava and gravel. It is composed of rocks, rarely aquifers, igneous layers of dispersed lava, or layers of porous, hollow limestone.
The groundwater transfer device 1 is inserted into a single aquifer having a target temperature, amount of water, etc., and for example, as shown in FIG. 1, of two aquifers separated above and below, the lower zone thereof. It is inserted into the water layer A.

The groundwater return device 1 includes a vertical casing 10, a first pipe 20 (outward pipe) extending from an opening (suction port 21) in the casing 10 to the outside of the casing 10 above, and a outside of the casing 10. A second pipe 30 (return pipe) having an opening (discharge port 34a) below the first pipe 20 and extending below the first pipe 20 into the casing 10 from the first pipe. The impermeable portion 40 that vertically divides the space in the casing 10 at the height position between the opening of the pipe 20 (suction port 21) and the opening of the second pipe 30 (discharge port 34a), and the second pipe. A bubble mixing device 50 that mixes bubbles in the 30 (return pipe) and an exhaust device 60 that discharges the air in the casing 10 to the outside are provided, and the ground water pumped from the ground is circulated to the ground side facility X to the ground. It is configured to be back inside.

The casing 10 is a long cylindrical member made of a metal pipe, and is configured by connecting a plurality of cylindrical members in the vertical direction thereof.
The upper end of the casing 10 is closed by a disk-shaped lid member 13. Further, the lower end portion of the casing 10 is closed, and as illustrated in FIG. 2, it is in contact with a layer in the ground (impermeable layer according to the illustrated example).
The diameter of the casing 10 is appropriately selected from, for example, 100 mm, 125 mm, 150 mm, 200 mm, 300 mm and the like, depending on the required circulation amount.
Strainer portions 11 and 12 are provided on the lower end side of the casing 10 at positions corresponding to the target aquifer A.

The strainer portions 11 and 12 are vertically long slit-shaped through holes that penetrate the peripheral wall of the casing 10 in the radial direction and extend in the vertical direction, and are located on the upper side and the lower side of the impermeable portion 40 as a boundary. Multiple are provided at intervals in the circumferential direction.
The width dimension (circumferential direction dimension) of each strainer portion 11 (or 12) is appropriately set so as not to allow gravel (pebbles) or the like of the aquifer A to pass through.
As another example of the strainer portions 11 and 12, it is also possible to have an embodiment composed of a large number of small holes or an embodiment composed of a fibrous material that allows water to pass through.

The upper strainer portion 11 is located above the impermeable portion 40 and is arranged corresponding to the upper side of the target water zone A.
Further, the lower strainer portion 12 is located below the impermeable portion 40 and is arranged corresponding to the lower side of the target aquifer A.

The first pipe 20 is composed of a cylindrical pipe or the like, and according to the illustrated example, is used as an outward pipe for sucking up water in the casing 10.
The first pipe 20 has an opening as a suction port 21 on the lower end side, extends from the suction port 21 to the outside of the casing 10 above, and is connected to the pipe inlet of the ground side equipment X.
In the figure, reference numerals M1 and M2 are flow meters for measuring the flow rate of water in the pipeline, and reference numeral P1 is a circulation pump for forcibly circulating water in the pipeline.

The above-ground equipment X is configured to pass the groundwater pumped up by the first pipe 20 through a heat exchanger and use it for heat, and return the used water to the second pipe 30.
For example, the above-ground equipment X in the figure is a snowmelt device, and is configured to allow groundwater to pass through a coiled heat exchanger embedded in the ground.
As another example of the above-ground side equipment X, it is also possible to use it as a heat exchanger portion in an air conditioner, a cold chain device, or another refrigerating device.

According to the illustrated example, the second pipe 30 is used as a return pipe which is conveyed by the first pipe 20 (outward pipe) and returns the water used by the above-ground equipment X to the inside of the casing 10 and discharges the water.
The second pipe 30 (return pipe) includes a cylindrical pipe-shaped transport pipe 31 inserted from the outside of the casing 10 into the casing 10, and a diameter-expanded pipe 32 expanded on the lower side of the transport pipe 31. A downward pipe 33 (see FIG. 2) whose diameter is reduced on the lower side of the diameter expansion pipe 32 and further extends downward, and an opening as a discharge port 34a at the tip of the downward pipe 33 protruding laterally from the peripheral wall of the downward pipe 33. It is configured to include a protruding pipe 34 having a protrusion tube 34.

The transport pipe 31 extends along the ground from the discharge port of the ground-side equipment X, penetrates the lid member 13, and extends downward in the casing 10.
The pipe of the bubble mixing device 50 is connected to the ground side of the transport pipe 31. Bubbles are mixed in the transport pipe 31 by the bubble mixing device 50.

The bubble mixing device 50 is a well-known device (sometimes referred to as a bubble generator) that generates fine bubbles in water, and the generated bubbles are transferred to the second pipe 30 (specifically, the transport pipe 31). The pipes are connected so that they mix with the water inside.

The diameter-expanding pipe 32 is a cylindrical tank-shaped pipe body having an outer diameter larger than that of the transport pipe 31.
A water-impervious portion 40 is provided on the outer peripheral portion of the diameter-expanding pipe 32.

The water-impervious portion 40 is formed of an elastic material such as synthetic rubber in an endless annular shape. A plurality (three according to the illustrated example) of the water-impervious portions 40 are arranged on the outer peripheral portion of the expansion pipe 32 at intervals in the vertical direction, and each of them is immovably fixed to the expansion pipe 32. There is.
The water-impervious portion 40 is movable in sliding contact with the inner surface of the casing 10. Therefore, for example, when deposits such as earth and sand accumulate in the vertical direction, particularly near the lower end of the casing 10, or when the strainer portion 12 is partially clogged, the casing 10 is moved in the vertical direction. If this is the case, it is possible to reduce the water discharge obstruction due to these accumulations and clogging.
In order to make the downward movement of the casing 10 smoother, a ball bearing structure is provided in which a plurality of balls are rolled between the outer peripheral surface of the diameter-expanding pipe 32 and the inner peripheral surface of the casing 10. It is also possible to equip it. In this aspect, if necessary, a watertight member such as an elastic member is appropriately combined to improve the watertightness between adjacent balls.
As an example of the impermeable portion 40, it is possible to use an O-ring.

Further, the downward pipe 33 is a pipe body whose diameter is reduced on the lower end side of the diameter expansion pipe 32 and is extended downward, and includes a plurality of protruding pipes 34 spaced in the vertical direction.
The lower end of the downward pipe 33 is closed and is in contact with the inner surface of the lower end wall of the casing 10, and this contact holds the heights of the plurality of protruding pipes 34 so as to correspond to the aquifer A. ..

The protruding pipe 34 is a pipe body that protrudes radially outward from the outer peripheral surface of the downward pipe 33, and the tip thereof is opened to form a discharge port 34a.
The inner diameter D2 of the protruding pipe 34 and the discharge port 34a is set smaller than the inner diameter D1 of the downward pipe 33 (see FIG. 3).
The protruding pipes 34 are spaced vertically at intervals (substantially equal intervals according to the illustrated example) of the downward pipe 33, and are also spaced at substantially equal intervals in the circumferential direction of the downward pipe 33 (substantially equidistant according to the illustrated example). A plurality are provided (see FIGS. 2 and 3).

Further, the exhaust device 60 is composed of a pipe penetrating the lid member 13, a vacuum pump connected to the pipe, and the like, and exhausts the air in the casing 10 to the outside of the ground. Therefore, according to this exhaust device 60, it is possible to prevent the groundwater from being deteriorated by the air remaining in the casing 10.

The groundwater transfer device 1 having the above configuration is buried in the ground by the procedure described in, for example, Japanese Patent No. 4485465, and the upper and lower strainer portions 11 and 12 are located in the aquifer A.
In this burial process, the lower end of the casing 10 inserted into the ground is in contact with the impermeable layer, and then the second pipe 30 is inserted into the casing 10 and the lower end of the second pipe 30 is inserted. Contact the layer in the ground (impermeable layer according to the illustrated example). The suction port 21 and the plurality of protruding pipes 34 are located within the vertical width of the aquifer A.

Next, the characteristic action and effect of the groundwater reciprocating device 1 having the above configuration will be described in detail.
The water in the upper region of the aquifer A penetrates into the casing 10 through the strainer portion 11.
When the circulation pump P1 is driven in this state, the water in the casing 10 is sucked into the suction port 21 and circulates in the first pipe 20, the ground side equipment X, and the second pipe 30.
During this circulation, bubbles are mixed into the water in the second pipe 30 by the bubble mixing device 50.
Then, the water and air bubbles in the second pipe 30 flow in the downward pipe 33, are discharged into the casing 10 from the discharge ports 34a at the tips of the plurality of protruding pipes 34, and further pass through the lower strainer portion 12. , Returned to the lower region of the aquifer A.
Due to the above-mentioned flow of water, there is relatively little earth and sand in the aquifer A around the strainers 11 and 12 in the casing 10, and the portion C filled with water (when referred to as an underwater dome). There is.) Is formed.

In the above process, the water in the downward pipe 33 is vigorously ejected from the discharge port 34a having a relatively small diameter in a state where the bubbles B are mixed (see FIG. 2). Therefore, it is possible to prevent the earth and sand of the aquifer A from invading the casing 10 through the strainer portion 12, and eventually the strainer portion 12 is clogged with the earth and sand or the inside of the casing 10 is earth and sand. Etc. can be prevented from accumulating.
Moreover, according to a preferred example of the present embodiment, since a plurality of protruding pipes 34 are provided in the vertical direction of the downward pipe 33, even if sediment or the like accumulates near the lower end in the casing 10, even if it is accumulated. Water can be continuously discharged by the protruding pipe 34 located on the upper side while avoiding the accumulated earth and sand.
Further, even if the strainer portion 12 is partially clogged in the circumferential direction, the discharge port 34a of any of the protruding pipes 34 can be directed to the unclogging strainer portion 12, and thus the discharge port 34a can be directed to the unclogging strainer portion 12. , It is possible to reduce the fact that clogging hinders the discharge of water.
Therefore, according to the groundwater return device 1, the discharged water from the second pipe 30 (return pipe) is smoothly returned to the aquifer A, and the groundwater is efficiently circulated between the ground and the ground. Can be done.

According to the above embodiment, the plurality of protruding pipes 34 are spaced vertically and also spaced in the circumferential direction, but as another example, the protruding pipes 34 are arranged at the same height position in the circumferential direction. It is also possible to have a plurality of arrangements (see FIG. 4), a plurality of protrusion pipes 34 facing the same direction in the vertical direction (not shown), and the like.

Further, in the above embodiment, each protruding pipe 34 is formed in a cylindrical shape having the same diameter in the length direction, but as another preferred embodiment, each protruding pipe 34 has an inner diameter gradually toward the discharge port 34a. It may be formed in the shape of a small nozzle.

Further, in FIGS. 2 to 4, each protruding pipe 34 is shown as a member integrated with the downward pipe 33, but as another example other than the illustrated example, the downward pipe 33 is composed of a plurality of straight pipes and is vertically and vertically. A cheese pipe having a protruding pipe 34 may be provided between the straight pipes adjacent to the pipe.

Further, as a more preferable embodiment, as shown in FIGS. 5 and 6, the protruding pipe 34 is rotatably provided around the axial center portion of the downward pipe 33, and the protruding pipe 34 is provided with respect to the downward pipe 33. , Tilt in one of the circumferential directions (clockwise according to the example of FIG. 6). Hereinafter, this aspect will be described in detail.
In this aspect, as shown in FIG. 5, the downward pipe 33 is composed of a downward pipe main body 33a extending in the vertical direction and a rotary pipe 33b that rotates in the middle of the downward pipe main body 33a.
The rotary pipe 33b has a plurality of protruding pipes 34 in a T shape on the outer peripheral portion thereof, and is rotatably fitted between the vertically divided downward pipe main bodies 33a and 33a.
The rotary pipe 33b is provided with a plurality of (three according to the illustrated example) protruding pipes 34 inclined in one direction in the circumferential direction on the outer peripheral surface of the straight pipe portion 33b1 extending in the vertical direction.
The straight pipe portion 33b1 is rotatably supported with respect to the downward pipe main body 33a. In this support structure, for example, the straight pipe portion 33b1 may be rotatably fitted to the downward pipe main body 33a, and as another example, the straight pipe portion 33b1 and the downward pipe main body 33a are connected via a ball bearing. You may do so.

Further, if the inclined state of the protruding pipe 34 is described in detail, as shown in FIG. 6, the protruding pipe 34 is located at a position where the center line L1 thereof is radially separated from the center of the straight pipe portion 33b1 (according to the illustrated example). For example, the position on the virtual circle Q along the outer peripheral surface of the straight pipe portion 33b1 is set as the inclination base point p, and the angle α is inclined to one of the circumferential directions (clockwise according to the illustrated example).
The angle α is appropriately set so as to apply a sufficient rotational force to the rotary tube 33b, and is preferably set to 45 degrees or more.

Therefore, according to the embodiment shown in FIGS. 5 and 6, the plurality of protruding pipes 34 continuously rotate in one direction due to the momentum of water and air bubbles discharged from the discharge port 34a.
Therefore, water and air bubbles in the projecting pipe 34 are ejected over a relatively wide range in the circumferential direction, effectively suppressing the invasion of earth and sand into the casing 10. Moreover, even if the strainer portion 12 is partially clogged or if sediment or the like is partially accumulated in the casing 10, these portions are avoided in the circumferential direction by the rotating protruding pipe 34, and water is used. It is possible to secure the discharge route of.

According to the above embodiment, the rotary pipe 33b is rotated by the jet output of the fluid from the protruding pipe 3, but as another example, for example, a structure in which the rotary pipe 33b is rotated by using a motor is illustrated. It is also possible to have a structure in which the rotary tube 33b is rotated by a principle other than the above.

Further, according to the above embodiment, the structure is such that the rotary pipe 33b is rotated with respect to the downward pipe main bodies 33a and 33a, but as another example, the downward pipe main bodies 33a and 33a and the rotary pipe 33b shown in the figure are integrated downward. It is also possible to have a structure in which the entire tube 33 is rotated with respect to the enlarged diameter tube 32.

Further, the present invention is not limited to the above-described embodiment, and can be appropriately changed without changing the gist of the present invention.

1: Groundwater return device 10: Casing 11, 12: Strainer part 13: Cover member 20: First pipe 21: Suction port (opening)
30: Second pipe 31: Conveying pipe 32: Expanded pipe 33: Downward pipe 34: Protruding pipe 34a: Discharge port (opening)
40: Water shield 50: Bubble mixing device 60: Exhaust device B: Bubble C: Underwater dome M1: Flow meter (going)
M2: Flow meter (return)
P1: Circulation pump X: Ground side equipment D1: Inner diameter of downward pipe D2: Inner diameter of discharge port

Claims (7)

A vertical casing, a first pipe extending from the opening located inside the casing to the outside of the casing above, and a pipe entering the casing from outside the casing and extending downward to the lower side of the first pipe. It is provided with a second pipe having an opening in the casing and an impermeable portion that vertically divides the space in the casing at a height position between the opening of the first pipe and the opening of the second pipe. In the underground water return device, one of the pipes and the second pipe is used as an outward pipe for transporting water from the inside of the casing to the outside of the casing, and the other is a return pipe for returning water from the outside of the casing to the inside of the casing.
A strainer portion capable of passing water is provided on the peripheral wall of the casing above and below the impermeable portion.
The return pipe is characterized by including a downward pipe extending downward and a protruding pipe that projects laterally from the peripheral wall of the downward pipe and has an opening as a discharge port at the tip thereof. Device. The groundwater reciprocating device according to claim 1, wherein a plurality of the protruding pipes are provided on the peripheral wall of the downward pipe in the circumferential direction. The groundwater reciprocating device according to claim 1 or 2, wherein a plurality of the protruding pipes are provided in the vertical direction of the downward pipe. The groundwater return device according to any one of claims 1 to 3, wherein the inner diameter of the discharge port of the protruding pipe is made smaller than the inner diameter of the downward pipe. The groundwater return device according to any one of claims 1 to 4, wherein a bubble mixing device for mixing bubbles is provided in the return pipe. The groundwater return device according to any one of claims 1 to 5, wherein the protruding pipe is provided so as to rotate around the downward pipe. The groundwater reciprocating device according to claim 6, wherein the protruding pipe is provided so as to be inclined in one direction in the circumferential direction with respect to the downward pipe.

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