JP2011017237A - Heat exchange type well device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchange type well device which does not change the total amount of ground water by solving the problems of conventional air-conditioning devices, snow-melting devices in snow countries, and other ground water-heat utilization devices wherein ground subsidence occurs due to the excessive pumping-up of ground water, and in certain places, administrative authorities restrict new constructions, additional construction, or an increase in the capacity of a well, causing the situations of these problems serious.SOLUTION: In a ground water pumping-up well, ground water is pumped up from the gravel layer of the deep part (lower layer part) of the well, and the cool heat (summer) or the hot heat (winter) of the pumped-up ground water is provided to the service water (circulation water or river water) on the ground. The ground water is then recirculated to the gravel layer of the shallow part (upper layer part) of the same well, and the service water (circulation water or river water) which receives heat from the ground water is used for air conditioning, snow melting, and other purposes.

Description

  The present invention relates to a heat exchange type well device for effectively using groundwater pumped up in an air conditioner, a snow extinguisher or other groundwater heat utilization device in a snowy country.

Groundwater is cooler in summer and warmer in winter than air temperature due to its constant temperature, so it is used for air-conditioning cooling in summer and heat collection in winter, and in snowy countries, snowfall and snowfall during winter periods on roads etc. Although it is used as snow treatment water as a treatment means, it has become a social problem because of ground subsidence due to excessive pumping of groundwater for several years. In some areas, administrative authorities are restricting new or additional snow-breaking wells or increasing capacity, making the situation serious.
Therefore, in order to deal with (1) ground subsidence, in the snow-breaking well, the groundwater pumped up is not discharged to the ground, but is radiated to the ground through a heat exchange pipe buried under the ground, and then dug separately. It is considered to return to the ground again from a well.
(2) Without pumping groundwater from the well, simply circulate the target water on the ground in the well and heat it with groundwater for snow removal in winter, or use it for cooling and other uses in summer It is also considered to do.

  However, in the method (1), it is necessary to dig two wells, which is expensive and the land is limited. In addition, since the method (2) is generally stagnant regardless of the flow of water in the well, the temperature of the groundwater in the well is lowered by the circulating target water (such as snow removal in winter). When used as a heat source) or rising (when used as a summer heat source), it will not function.

In the pumping well for using groundwater heat, the groundwater is pumped from the gravel layer in the deep part (lower layer), and the cold water or heat of the pumped groundwater is given to the ground water (circulating fluid or river water) A groundwater recirculation method for heat exchange type wells in which groundwater is returned to the gravel layer in the shallow part (upper part) of the same well, and the water heated by the groundwater is used for various purposes.
Also,
(1) Excavated slightly larger than the casing and has one or more pumped gravel layers in the deep part (lower part) and one or more reflux gravel layers in the shallow part (upper part). A borehole having an impermeable layer in the layer,
(2) A casing which is inserted into the borehole and has a water absorption slit at the lower part corresponding to the deeply-pumped gravel layer and a reflux slit at the upper part corresponding to the reflux gravel layer,
(3) The gravel filled in the gap between the borehole and the outer periphery of the casing, the part where the impermeable layer exists in the middle part and the part where the impermeable layer exists between the upper part of the reflux gravel layer and the ground Enough cementing to block the top and bottom of the gravel,
(4) A lid that seals the upper end of the casing, and a shielding member that bisects the inside of the casing up and down below the reflux slit, a water absorption area formed in the lower part and a reflux area formed in the upper part,
(5) A submersible pump suspended in a shielding member and installed in a water absorption area, a submerged pump that passes through the shielding member and the top cover of the casing and leads to the ground and discharge pipe to the heat exchange tank below, heat exchange A reflux pipe from the tank to the reflux zone,
(6) A heat exchange tank having a plurality of heat exchange pipes extending from an inflow chamber connected to the inflow water pipe to an outflow chamber connected to the outflow water pipe,
After the groundwater pumped up from the deep underground is given to the water (circulating fluid or river water) existing on the ground, it is returned to the upper return zone in the same well casing, A heat exchanging well device in which a reflux slit is provided to return to a shallow gravel layer blocked by cementing from a deep water-absorbing gravel layer.
Furthermore, (1) it is excavated one size larger than the casing, has one or more water-absorbing gravel layers in the deep part (lower layer part), and one or more reflux gravel layers in the shallow part (upper layer part). A borehole having an impermeable layer in the intermediate layer,
(2) A casing which is inserted into the borehole and has a water supply slit at the lower part corresponding to the pumped gravel layer and a reflux slit at the upper part corresponding to the reflux gravel layer,
(3) Gravel filled in the gap between the borehole and the outer periphery of the casing, gravel in the middle part of the impermeable layer, and impermeable layer between the upper part of the reflux gravel layer and the ground Enough cementing to block the top and bottom applied to the gravel of the part,
(4) An annular seat provided on the inner wall below the reflux slit in the casing, installed in close contact with the annular seat by an annular projection, extending to the upper end of the casing and sealed together with the casing by the upper wall. Small cylindrical heat exchange tank,
(5) An inflow chamber and an outflow chamber formed at the upper part of the cylindrical heat exchange tank and connected to the inflow water supply pipe and the outflow water supply pipe through the upper wall. The outflow chamber extends from the inflow chamber to the inside of the heat exchange tank. A heat exchange pipe returning to the top, a plurality of reflux ports provided in the upper peripheral wall of the heat exchange tank,
(6) A submersible pump connected to the lower part of the heat exchange tank and supplying groundwater in the water absorption area to the heat exchange tank through the discharge pipe,
After the groundwater pumped from the deep underground is supplied to the water (circulating fluid or river water) circulating from the ground to the well, it is returned to the upper return zone in the same well casing and returned. A heat exchanging well device in which a deeply-pumped gravel layer is returned to a shallow gravel layer blocked by cementing from a slit provided in the outer periphery of the casing of the basin.

By the above means, the present invention provides a lower water absorption area and an upper reflux area in a single well, and the groundwater pumped up from the deep part exchanges heat with water existing on the ground (such as circulating liquid or river water). It is only recirculated to the shallow gravel layer through the upper recirculation zone in the same well without discharging to the ground, and the circulation given heat or cold by heat exchange with the groundwater Since water and river water are used as water, the total amount of water in the ground does not change even though the strata are different, and groundwater heat can be used without wasting groundwater. The settlement problem can be solved. Therefore, new wells can be drilled even in areas where land subsidence is a problem and is restricted.
In addition, after circulating the groundwater pumped up to the heat exchange pipe laid under the ground and radiating the heat held by it to the ground, which was conventionally considered as a snow-melting method, In order to return to the inside, it is necessary to dig a return well in addition to the snow-dissipating well, and securing the site for that purpose and increasing the cost are problematic, and the method of simply circulating the target water in the well and exchanging heat is the problem. Since the groundwater in the well is generally a stagnant layer, the temperature of the well water decreases or rises due to heat exchange, and the purpose cannot be achieved. However, the present invention eliminates these problems. Can do.

Embodiment 1 of the present invention will be described with reference to FIG.
A is the ground, B is the borehole drilled slightly larger than the casing C by the percussion method and other drilling methods, D is the heat exchange tank, E is the upper impermeable layer above the upper gravel layer by cementing the upper part The well hole around the casing is blocked, and F blocks the hole near the casing in the impermeable layer between the gravel layer in the pumping area and the gravel layer in the reflux area by lower cementing.
Reference numeral 1 denotes a water supply pipe for introducing water (circulation liquid or river water) existing on the ground into the heat exchange tank D. The introduced water is air-conditioned from the water supply pipe 2 through the inflow chamber 5, the heat exchange pipe 7, and the outflow chamber 6. It is sent to a target device such as equipment or a snow removal device. 8 is a sand discharge pipe. 9 is a discharge pipe for sending ground water sent from the submersible pump P in the water absorption area 16 to the heat exchange tank D, and 10 is for returning the ground water heat-exchanged by the reflux pipe to the reflux area 12. These pipes penetrate the casing lid 11 closely, and the reflux area 12 is a sealed space.
Reference numeral 14 denotes a closed disk that divides the casing into an upper reflux area 12 and a lower water absorption area 16, and is supported by an annular seat provided on the inner periphery of the casing near the lower cementing F to seal the upper and lower sides. Further, a discharge pipe from the pump P is penetrated in the center in a watertight manner. In addition, if a clearance gap with the inner periphery of a casing is made small, a closed disk will become a guide set centering on a pump. Moreover, it can seal more reliably if packing is attached to the outer periphery of the lower surface of the closed disk.
A reflux slit 13 is provided on the outer periphery of the reflux area of the casing below the upper cementing E. Reference numeral 17 denotes a water absorption slit as a strainer, which is provided on the outer periphery of the water absorption area below the lower cementing. In place of such a simple slit, a clogging prevention effect can be obtained by forming a large slit and winding a wire around the outer periphery in a spiral manner to form a strainer portion.
18 is a power cord to the pump, which is led to the ground through the return zone.
With the above configuration, the groundwater pumped from the deep gravel layer through the water absorption slit 17 of the water absorption area by the pump P is sent to the heat exchange tank D through the discharge pipe 9. Here, after the groundwater heat is given to the water flowing in the heat exchange pipe 7, it is returned from the reflux pipe 10 to the reflux area in the casing, and further returned to the shallow gravel layer through the reflux slit 13.
The water enters the heat exchange tank through the water supply pipe 1, is given groundwater heat, and is sent from the water supply pipe 2 to a cooling / heating device, a snow squeezing device, and other target devices. Needless to say, this heat exchange tank can be used for receiving heat from a heat pump.
If this is used for snow removal, the water for snow removal may be taken directly into the road surface or roof, etc. if clean river water is obtained, but the snow will flow directly. If sucked together, it will cause troubles in the snowpipe pipe, so it will circulate the antifreeze and heat it by exchanging heat with the groundwater, and circulate it through the snowpipe pipe laid under the road surface or under the roof. Therefore, it is more effective and trouble-free if the road surface or roof is warmed to remove snow indirectly.

Next, Embodiment 2 of the present invention will be described with reference to FIG.
This is conceptually the same as in Example 1, but differs in that the heat exchange tank is provided in the return zone of the casing, so this point will be described, and the same points will be omitted. The recirculation zone 12 'is inserted into the recirculation zone 12' while leaving a recirculation space. The lower end of the recirculation zone 12 'is closely supported by the annular seat 15' on the inner periphery of the casing to divide the lower water absorption zone 16 and the upper reflux zone. 3 'is an upper wall that seals the upper end of the casing and at the same time seals the upper part of the heat exchange tank, to which the water supply pipes 1 and 2 are attached.
P is suspended under the heat exchange tank by a submersible pump, and the groundwater in the water absorption area is sent through the discharge pipe 9 to the heat exchange tank through the water supply pipe 9. Reference numeral 10 'denotes a reflux port provided around the upper part of the heat exchange tank. In addition, if the heat exchange tank and the heat exchange pipe can be divided vertically by 1, 2 flanges or couplings, assembly and maintenance are facilitated.
With the above configuration, the groundwater pumped from the deep gravel layer by the pump P is sent to the heat exchange tank D through the discharge pipe 9, where the groundwater heat is given to the water flowing through the heat exchange pipe 7 through the heat exchange pipe 7, It enters the reflux region 12 ′ from the upper reflux port 10 ′ and returns to the shallow gravel layer from the reflux slit 13.
According to this configuration, since it is not necessary to provide the heat exchange tank on the ground, there is no room on the site, and the ground is clean.

  1 is a schematic sectional side view of Example 1 of the present invention.   The schematic sectional side view of Example 2 of this invention.   Fig. 2 is a transverse sectional view taken along line III-III.

A ground, B borehole, C casing, D heat exchange tank, E upper cementing, F lower cementing, P submersible pump with built-in motor, 1.2 water supply pipe, 3, 3 'upper wall, 4 closure fitting, 7 heat Exchange pipe, 8 Sand discharge pipe, 9 Discharge pipe, 10 Return pipe, 11 Lid, 12, 12 'Return area, 13 Return slit, 14 Closed disk, 14' Annular projection, 15, 15 'Annular seat, 16 Water absorption area , 17 Water absorption slit, 18 Power cord

Claims (3)

  In the pumping well for using groundwater heat, the groundwater is pumped from the gravel layer in the deep part (lower layer), the cold water or the heat of the pumped groundwater is given to the ground water (circulating fluid or river water, etc.) A groundwater recirculation method for heat exchange type wells, in which groundwater is recirculated to the gravel layer in the shallow (upper layer) of the same well, and the above-mentioned liquid heated by the groundwater is used for various purposes. (1) Excavated slightly larger than the casing and has one or more pumped gravel layers in the deep part (lower part) and one or more reflux gravel layers in the shallow part (upper part). A borehole having an impermeable layer in the layer,
(2) A casing which is inserted into the borehole and has a water absorption slit at the lower part corresponding to the pumped gravel layer and a reflux slit at the upper part corresponding to the reflux gravel layer,
(3) The gravel filled in the gap between the borehole and the outer periphery of the casing, the part where the impermeable layer exists in the middle part and the part where the impermeable layer exists between the upper part of the reflux gravel layer and the ground Enough cementing to block the top and bottom of the gravel,
(4) A lid that seals the upper end of the casing, and a shielding member that bisects the inside of the casing up and down below the reflux slit, a water absorption area formed in the lower part and a reflux area formed in the upper part,
(5) A submersible pump suspended in a shielding member and installed in a water absorption area, a submerged pump that passes through the shielding member and the top cover of the casing and leads to the ground and discharge pipe to the heat exchange tank below, heat exchange A reflux pipe from the tank to the reflux zone,
(6) A heat exchange tank having a plurality of heat exchange pipes extending from an inflow chamber connected to the inflow water pipe to an outflow chamber connected to the outflow water pipe,
After the groundwater pumped up from the deep underground is given to the water (circulating fluid or river water) existing on the ground, it is returned to the upper return zone in the same well casing, A heat exchanging well apparatus in which the deeply pumped gravel layer is refluxed from the provided reflux slit to the shallow gravel layer blocked by cementing. (1) Excavated slightly larger than the casing and has one or more pumped gravel layers in the deep part (lower part) and one or more reflux gravel layers in the shallow part (upper part). A borehole having an impermeable layer in the layer,
(2) A casing which is inserted into the borehole and has a water supply slit at the lower part corresponding to the pumped gravel layer and a reflux slit at the upper part corresponding to the reflux gravel layer,
(3) Gravel filled in the gap between the borehole and the outer periphery of the casing, gravel in the middle part of the impermeable layer, and impermeable layer between the upper part of the reflux gravel layer and the ground Enough cementing to block the top and bottom applied to the gravel of the part,
(4) An annular seat provided on the inner wall below the reflux slit in the casing, installed in close contact with the annular seat by an annular projection, extending to the upper end of the casing and sealed together with the casing by the upper wall. Small cylindrical heat exchange tank,
(5) An inflow chamber and an outflow chamber formed at the upper part of the cylindrical heat exchange tank and connected to the inflow water supply pipe and the outflow water supply pipe through the upper wall. The outflow chamber extends from the inflow chamber to the inside of the heat exchange tank. A heat exchange pipe returning to the top, a plurality of reflux ports provided in the upper peripheral wall of the heat exchange tank,
(6) A submersible pump connected to the lower part of the heat exchange tank and supplying groundwater in the water absorption area to the heat exchange tank through the discharge pipe,
After the groundwater pumped from the deep underground is given to the water (circulating fluid or river water) circulating from the ground to the well in the same well, the groundwater is pumped into the upper return zone in the same well casing. A heat exchanging well device that is returned to the shallow gravel layer blocked by cementing from the deeply pumped gravel layer through a slit provided on the outer periphery of the casing in the return zone.

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