CN217584916U

CN217584916U - Support structure vacuum cavity combined middle-deep geothermal heat pipe

Info

Publication number: CN217584916U
Application number: CN202221137680.8U
Authority: CN
Inventors: 张鸣; 汪强
Original assignee: Isentropic Cycle Beijing New Energy Technology Co ltd
Current assignee: Isentropic Cycle Beijing New Energy Technology Co ltd
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-10-14
Anticipated expiration: 2032-05-12
Also published as: WO2023216372A1

Abstract

The utility model relates to a bracket structure vacuum cavity combination middle and deep layer geothermal heat pipe, which comprises an outer pipe and an inner pipe, wherein the bottom of the outer pipe is a sealing structure, and the top and the bottom of the inner pipe are both open structures; a first cavity is formed between the inner pipe and the outer pipe, a second cavity which is axially communicated is arranged in the middle of the inner pipe, the inner pipe is sleeved in the outer pipe, the bottom of the inner pipe is connected with a single-wall pipe which is coaxially arranged, an exchange hole is formed in the single-wall pipe, a communication area is reserved between the bottom of the single-wall pipe and the bottom of the outer pipe, and the first cavity is communicated with the second cavity through the communication area and the exchange hole; the inner pipe is a double-layer pipe, a third cavity is formed between the double-layer pipes, the third cavity is a vacuum cavity, and a heat-insulating material is sealed in the third cavity. The utility model discloses can be used for middle and deep layer geothermal energy to utilize the system, realize that area is little, to the comprehensive utilization effect of ecological environment zero influence, and need not to use the high-grade energy to carry out the concurrent heating, just can reach the heating demand of building and agricultural, reach the maximum utilization efficiency to geothermal energy.

Description

Support structure vacuum cavity combined middle-deep geothermal heat pipe

Technical Field

The utility model relates to a relevant technical field of adiabatic water conservancy diversion, concretely relates to deep geothermal pipe in support structure vacuum cavity combination.

Background

At present, heat pump systems are generally adopted for conventional geothermal energy utilization and are divided into the following main modes: 1. a surface water heat pump system which utilizes surface water as a cold and heat source; 2. the method comprises the following steps of utilizing a soil source, namely utilizing soil energy storage as a soil source heat pump system of a cold and heat source; 3. shallow ground water can be utilized as a cold and heat source. The three technical forms are basically shallow or surface energy utilization, and are combined with a heat pump technology to form a new energy utilization system.

The existing conventional geothermal energy utilization has the following disadvantages: 1. the utilization of water existing on the surface of the crust and exposed to the atmosphere, such as river water, lake water, reservoir water and the like, has large restriction on utilization places; the temperature of the local water body is increased or decreased due to the extraction of hot water and the discharge of cold water, the distribution of the temperature field of the water body in a specific area is affected, and the water environment is polluted to a certain extent. The temperature of the water heat resources existing on the earth surface is relatively low, and the traditional flow guide pipe has large heat loss, so that the heat utilization value of an earth surface water source system is low, and other energy sources are needed for assisting work. 2. The shallow soil has low heat energy temperature, and large-area pipeline burying is needed for providing quantitative heat energy; the ground source heat pump has large occupied area, large engineering quantity, large investment and low benefit; the heat collecting process can cause the problem of regional heat imbalance; shallow soil temperature is relatively low, and traditional honeycomb duct has great heat loss, so the surface water source system heat utilization value is lower, needs other energy auxiliary work. 3. The application is limited due to the limitation of underground heat resources; most of the systems adopt pumping, extracting and recharging modes, are open systems for utilizing underground water sources, have low utilization rate, bring the problem of oxidation of underground water, influence the underground ecological environment and easily cause pollution of underground water resources; the problems of ground settlement and the like are caused because the complete recharge of underground water cannot be realized and the water collection amount is larger than the recharge amount; the temperature of shallow groundwater cannot meet the requirement of domestic hot water, and the traditional flow guide pipe has large heat loss, so the heat utilization value of a surface water source system is low, and other energy sources are needed for auxiliary work.

In addition, the buried pipe used by the existing geothermal energy utilization system is mainly divided into two types according to the material: one is Polyethylene (PE) pipe, the other is steel pipe; the pipeline is divided into a direct water taking structure and a closed circulation structure of heat-conducting liquid special for a closed pipe component. The existing geothermal energy utilization system directly extracts underground hot water, exchanges heat in a ground heat exchanger, and recharges residual water after energy extraction. A closed pipe component is used, special heat-conducting liquid is injected into the component, geothermal energy is brought into a ground heat exchanger for heat exchange through circulation of the liquid in the pipe, the heat-conducting liquid after energy extraction flows back to the ground, and circulation is closed. The double-cavity buried pipe of a general closed pipe component is only provided with the extraction pipe and the return pipe, the pipe plays a role of only conducting heat liquid closed circulation without directly pumping underground water, the pipe does not have heat insulation performance, and flexible heat insulation materials can be wrapped outside the pipe for reducing heat energy loss. The heat-insulating material of the general closed pipe member uses rock wool, glass wool, rubber-plastic sponge and the like, the closed pipe member is wrapped outside the pipe, and the heat-insulating material has the heat conductivity coefficient lambda of 0.034-0.040W/(m.K) and is relatively large. If the pressure requirement exists, a pressure-resistant structural layer needs to be additionally arranged on the outer side of the heat insulation layer. Generally, only pipelines in the frozen soil layer are subjected to heat preservation and wrapping, but actually, the geothermal energy is gradually cooled from deep to shallow, and the heat loss is continuously maintained in the process of lifting the deep geothermal energy to the position below the frozen soil layer.

SUMMERY OF THE UTILITY MODEL

The utility model provides a deep geothermal duct in combination of bracket structure vacuum cavity, which solves one or more of the technical problems.

The utility model provides an above-mentioned technical problem's technical scheme as follows: a bracket structure vacuum cavity combined middle-deep geothermal heat pipe comprises an outer pipe and an inner pipe, wherein the bottom of the outer pipe is of a sealing structure, and the top and the bottom of the inner pipe are of an open structure; a first cavity is formed between the inner pipe and the outer pipe, a second cavity which is axially communicated is arranged in the middle of the inner pipe, the inner pipe is sleeved in the outer pipe, the bottom of the inner pipe is connected with a single-walled pipe which is coaxially arranged, an exchange hole is formed in the single-walled pipe, a communication area is reserved between the bottom of the single-walled pipe and the bottom of the outer pipe, and the first cavity is communicated with the second cavity through the communication area and the exchange hole; the inner pipe is a double-layer pipe, a third cavity is formed between the double-layer pipes, the third cavity is a vacuum cavity, and a heat insulation material is sealed in the third cavity.

The beneficial effects of the utility model are that: the utility model discloses a three-layer cavity structure utilizes the first cavity between inner tube and the outer tube as adopting hot cavity, the third cavity that inner tube self had is as adiabatic cavity, the second cavity at inner tube center is as hot transport chamber, adiabatic cavity is at the intermediate position of whole honeycomb duct, be located adopt hot cavity and carry between the chamber with heat, adiabatic cavity is self for independently sealing the structure, do not have any intercommunication with other two chambeies, utilize adiabatic cavity can be fine completely cut off adopt hot cavity and carry the heat transfer between the chamber with heat. The utility model discloses a deep geothermal duct in combination of support structure vacuum cavity realizes that area is little, geothermal energy low loss, to the zero comprehensive utilization effect of influence of ecological environment, and need not to use the high-grade energy to carry out the concurrent heating, just can reach the heating demand of building and agricultural, reaches the maximum utilization efficiency to geothermal energy. The utility model discloses a single-walled pipe to set up the exchange hole on the single-walled pipe, make in the fluid in the first cavity enters into the second cavity through the exchange hole, can further increase heat exchange efficiency.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Furthermore, a plurality of groups of exchange holes arranged along the axial direction are formed in the single-wall pipe, and each group of exchange holes are uniformly arranged along the circumferential direction of the single-wall pipe.

The beneficial effect of adopting the further scheme is that: and a plurality of groups of exchange holes which are arranged at intervals are adopted, so that the fluid flowing process is uniform and stable.

Further, the upper end of the single-wall pipe is inserted into the third cavity from the bottom of the inner pipe and is connected with the inner pipe in a sealing mode.

The beneficial effect of adopting the above further scheme is: the connection between the single-wall pipe and the inner pipe is more stable and reliable.

Further, a plurality of nylon heat insulation support rings are further arranged in the third cavity.

The beneficial effect of adopting the above further scheme is: through setting up the nylon lock ring, can make the third cavity of inner tube even, make the inner tube can bear sufficient pressure, guarantee the volume of third cavity, the heat loss of minimize inner tube in hot water transportation process.

Further, the heat insulation material sealed in the third cavity comprises aerogel particles or/and superfine glass fibers.

The beneficial effect of adopting the further scheme is that: the thermal conductivity coefficient lambda of the aerogel particles is reduced from 0.014W/(m.K) to 0.004W/(m.K) in a vacuum state by adopting the aerogel particles as a thermal insulation material, and the aerogel particles have a good thermal insulation effect.

Further, the heat insulation material is of a circular structure, and the heat insulation material of the circular structure is sleeved in a third cavity of the inner pipe; or the heat insulation material is of a linear rope structure, and the linear rope structure is wound in the third cavity.

The beneficial effect of adopting the above further scheme is: the third cavity can be filled with heat insulation materials, and the filling is convenient.

Further, the outer diameter of the outer pipe is 200 mm-1000 mm, the outer diameter of the inner pipe is 120 mm-920 mm, the outer diameter of the single-wall pipe is 120 mm-920 mm, and the diameter of the second cavity is not less than 100mm.

Furthermore, the outer pipe, the inner pipe and the single-wall pipe are all made of steel materials.

The beneficial effect of adopting the further scheme is that: the distance pressure generated by the depth of the buried pipe can be ensured to be resisted.

Further, the height of the communicating region is 2m to 100m.

Furthermore, the top of the inner pipe extends out of the top of the outer pipe, the top of the outer pipe is connected with the outer side wall of the inner pipe in a sealing mode, a water return port is formed in the side wall of the top of the outer pipe, and the top of the inner pipe is open and is a water outlet.

The beneficial effect of adopting the above further scheme is: the inner pipe and the outer pipe are effectively connected together, the water return port and the water outlet are respectively used for connecting the heat exchanger, and the whole structure is compact and reliable.

Drawings

FIG. 1 is a schematic view of the axial cross section of a deep geothermal heat pipe in a vacuum chamber assembly of a stent structure according to the present invention;

FIG. 2 isbase:Sub>A schematic cross-sectional view of A-A' in FIG. 1;

FIG. 3 is a schematic cross-sectional view of B-B' in FIG. 1;

FIG. 4 is a schematic cross-sectional view of C-C' in FIG. 1.

In the drawings, the reference numbers indicate the following list of parts:

1. an outer tube; 11. a sealing plate; 12. a first weld;

2. an inner tube; 21. a steel pipe; 22. a second weld;

3. a first cavity; 4. a second cavity; 5. a single wall pipe; 51. an exchange well; 6. a connected region;

7. a nylon heat insulation support ring;

8. and (4) a heat-insulating material.

Detailed Description

The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.

Example 1

As shown in fig. 1 to 4, the vacuum chamber combination middle-deep geothermal heat pipe with bracket structure of the present embodiment includes an outer pipe 1 and an inner pipe 2, wherein the bottom of the outer pipe 1 is a sealed structure, and the top and the bottom of the inner pipe 2 are both open structures; a first cavity 3 is formed between the inner tube 2 and the outer tube 1, a second cavity 4 which is axially through is arranged in the middle of the inner tube 2, the inner tube 2 is sleeved in the outer tube 1, a single-walled tube 5 which is coaxially arranged is connected to the bottom of the inner tube 2, an exchange hole 51 is formed in the single-walled tube 5, a communication area 6 is reserved between the bottom of the single-walled tube 5 and the bottom of the outer tube 1, and the first cavity 3 is communicated with the second cavity 4 through the communication area 6 and the exchange hole 51; the inner pipe 2 is a double-layer pipe, a third cavity is formed between the double-layer pipes, the third cavity is a vacuum cavity, and a heat insulation material 8 is sealed in the third cavity.

As shown in fig. 2 to 4, the outer tube 1 and the inner tube 2 of the present embodiment are both cylindrical.

As shown in fig. 1 and fig. 4, a plurality of groups of axially arranged exchange holes 51 are formed in the single-walled tube 5 of this embodiment, and each group of exchange holes 51 is uniformly arranged along the circumferential direction of the single-walled tube 5. And a plurality of groups of exchange holes which are arranged at intervals are adopted, so that the fluid flowing process is uniform and stable.

Specifically, the number of each group of the exchange holes 51 in the single-walled tube 5 of the present embodiment may be 2, 3, 4, 5, or the like, and may be set arbitrarily as needed. The shape of the exchange hole 51 may be a hole of any shape such as a circular hole or a square hole, as long as the first cavity 3 and the second cavity 4 can be communicated.

As shown in fig. 1, the upper end of the single-walled tube 5 of the present embodiment is inserted into the third cavity from the bottom of the inner tube 2 and is hermetically connected to the inner tube 2. The connection between the single-wall pipe and the inner pipe is more stable and reliable.

As shown in fig. 1, a plurality of nylon heat insulation support rings 7 are further disposed in the third cavity of this embodiment. Through setting up the nylon lock ring, can make the third cavity atress of inner tube even, make the inner tube can bear sufficient pressure, guarantee the volume of third cavity, the heat loss of minimize inner tube in hot water transportation process.

As shown in fig. 3, in an alternative of the present embodiment, the nylon heat-insulating support ring 7 is in a ring shape, the inner ring wall of the nylon heat-insulating support ring 7 may be abutted against the outer side wall of the steel pipe 21 inside the inner pipe 2, a plurality of support legs may be provided on the outer ring wall of the nylon heat-insulating support ring 7, and the support legs may be abutted against the inner side wall of the steel pipe 21 outside the inner pipe, and the number of the support legs may be arbitrarily set as required, for example, 2, 3, 4, 5, or the like.

As shown in fig. 1, the thermal insulation material 8 sealed in the third cavity of the present embodiment includes aerogel particles or/and ultra-fine glass fibers. The thermal conductivity coefficient lambda of the aerogel particles is reduced from 0.014W/(m.K) to 0.004W/(m.K) in a vacuum state by adopting the aerogel particles as a thermal insulation material, and the aerogel particles have a good thermal insulation effect.

Wherein, the heat insulation material 8 sealed in the third cavity is aerogel particles. Aerogel particles are adopted as a heat insulation material, and the thermal conductivity coefficient lambda of the aerogel particles is 0.014W/(m.K). The third cavity is of an independent sealing structure, a vacuum cavity with an aerogel particle heat-insulating layer is formed by vacuumizing, the heat conductivity coefficient lambda of the aerogel particles is reduced from 0.014W/(m.K) to 0.004W/(m.K) in a vacuum state, and the heat-insulating effect is good. Because the heat insulation material 8 is filled in the whole third cavity and is positioned in the middle of the whole multi-cavity heat insulation flow guide pipe, the heat insulation depth is basically the same as that of the whole pipe, the heat insulation is continuous, the whole inner pipe is fully insulated, and the heat insulation material is not only arranged in a frozen soil layer, so that the heat loss of the terrestrial heat from deep to shallow is greatly reduced.

As shown in fig. 1, in a preferred embodiment of the present invention, the thermal insulation material 8 is a circular ring structure, and the thermal insulation material 8 with the circular ring structure is sleeved in the third cavity of the inner tube 2; or the heat insulation material 8 is a linear rope structure which is wound in the third cavity. The third cavity can be filled with heat insulation materials, and the filling is convenient.

In a specific aspect of this embodiment, the outer diameter of the outer tube 1 is 200mm to 1000mm, and specifically may be 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm, 270mm, 280mm, 290mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 1000mm; the outer diameter of the inner pipe 2 is 120 mm-920 mm, and specifically 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 920mm can be selected; the outer diameter of the single-wall pipe 5 is 120 mm-920 mm, and specifically 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 650mm, 700mm, 750mm, 800mm, 850mm, 900mm, 920mm can be selected; the diameter of the second cavity 4 is not less than 100mm.

The outer tube 1, the inner tube 2 and the single-walled tube 5 of this embodiment are made of steel. All the pipes of the embodiment are made of high-strength steel, and have good corrosion resistance in a humid environment. But also ensures resistance to the distance pressure generated by the depth of the buried pipe.

Specifically, the height of the communicating region 6 is 2m to 100m, and specifically, 2m, 5m, 10m, 15m, 20m, 25m, 30m, 35m, 40m, 45m, 50m, 55m, 60m, 65m, 70m, 75m, 80m, 85m, 90m, 95m, and 100m may be selected.

As shown in fig. 1 to 4, the third cavity of the present embodiment is an annular cavity. The first chamber 3 and the second chamber 4 can be thermally insulated by using an annular third chamber. The first cavity 3 of this embodiment is an annular cavity. The first cavity and the second cavity which are communicated with each other in the communication area are utilized to form a U-shaped circulation flow channel, and circulation flow guide of fluids with different temperatures can be carried out in one flow guide pipe.

The top of this embodiment the inner tube 2 is followed the top of outer tube 1 stretches out, the top of outer tube 1 with the lateral wall sealing connection of inner tube 2, set up the return water mouth on the top lateral wall of outer tube 1, the uncovered delivery port that is in top of inner tube 2. The inner pipe 2 and the outer pipe 1 are effectively connected together, and the water return port and the water outlet are respectively used for connecting a heat exchanger, so that the whole structure is compact and reliable.

An alternative of this embodiment is, in order to make overall structure more stable, can also set up the support in first cavity 3, makes the support respectively with the lateral wall of inner tube 2 and the inside wall butt of outer tube 1, carries out structural support to first cavity 3.

As shown in fig. 1 and 2, the vacuum chamber combination of the bracket structure and the intermediate-deep geothermal duct are buried under the natural ground, so that the multi-chamber heat-insulating duct penetrates the shallow geothermal area (within 200m under the natural ground 10 and the temperature is lower than 25 ℃) and extends into the intermediate-deep geothermal area (within 3000m under the natural ground 10 and the temperature is higher than 25 ℃). The water return port of the outer pipe 1 is communicated with the water outlet of the heat exchanger, the water outlet of the inner pipe 2 is communicated with the water inlet of the heat exchanger, so that water in the heat exchanger enters the communicating region 6 at the bottom of the outer pipe 1 through the first cavity 3 and enters the second cavity 4 from the bottom of the inner pipe 2 through the communicating region 6, and the water heated by geothermal heat enters the heat exchanger along the second cavity 4 of the inner pipe 2.

When the support structure vacuum cavity combination middle-deep geothermal heat conduit is manufactured, two steel pipes 21 are sleeved together to form a double-layer steel pipe, namely an inner pipe 2, then the upper end of a single-wall pipe 5 is inserted between the lower ends of the two steel pipes 21 and welded to form a second welding seam 22, and a cavity between the double-layer steel pipes is a third cavity; filling a heat-insulating material 8 into the third cavity, filling the heat-insulating material 8 and the nylon heat-insulating support ring 7, welding the upper end of the double-layer steel pipe, vacuumizing, and forming the inner pipe 2 with the sealed vacuum cavity after welding; sleeving the inner pipe 2 in the outer pipe 1, and reserving a communication area 6 between the bottom of the inner pipe 2 and the bottom of the outer pipe 1; the bottom of the outer tube 1 is sealed by a sealing plate 11, the sealing plate 11 may be a circular plate, and the sealing plate 11 and the bottom of the outer tube 1 form a first welding line 12. One end of the double-layer steel pipe is made of a steel plate made of the same material, a workpiece is melted through laser welding to form a specific molten pool, and then a second cavity with a sealed bottom is formed. The vacuum pumping while welding is specifically that the heat loss of the manufactured inner tube can be reduced from 50% to 5% by carrying out multi-stage vacuum pumping treatment by using vacuum pumping equipment and finally welding and sealing.

And filling the heat insulation material 8 into the third cavity, specifically, pressing the aerogel particles into a circular ring-shaped heat insulation material 8 with the axial length of 300-500mm, and then filling the circular ring-shaped heat insulation material 8 into the third cavity. The aerogel particles are firstly pressed into a circular ring shape, so that the third cavity can be filled conveniently, the heat preservation effect is good, and the subsequent vacuumizing operation is facilitated.

When the support structure vacuum cavity combination middle-deep geothermal conduit is used, water enters the communication area 6 from the first cavity 3 downwards, enters the second cavity 4 through the communication area 6 and the exchange holes 51 on the single-wall pipe 5 after heat exchange, and is output from the second cavity 4 from bottom to top.

Deep geothermal duct adopts three-layer cavity structure in the combination of support structure vacuum cavity of this embodiment, utilize the first cavity between inner tube and the outer tube as adopting hot cavity, the third cavity that inner tube self has is as adiabatic cavity, the second cavity at inner tube center is as heat transport chamber, adiabatic cavity is in the intermediate position of whole honeycomb duct, it adopts between hot cavity and the heat transport chamber to be located, adiabatic cavity is self for independent closed construction, do not have any intercommunication with other two chambeies, utilize adiabatic cavity can be fine completely cut off to adopt the heat transfer between hot cavity and the heat transport chamber. The deep geothermal pipe in the combination of the vacuum cavity of the bracket structure of the embodiment realizes the comprehensive utilization effect of small floor area, low loss of geothermal energy and zero influence on the ecological environment, and can meet the heating requirements of buildings and agriculture without using high-grade energy for heat compensation, thereby achieving the maximum utilization efficiency of geothermal energy. This embodiment adopts the single-walled pipe to set up the exchange hole on the single-walled pipe, make the fluid in the first cavity enter into the second cavity through the exchange hole in, can further increase heat exchange efficiency.

The support structure vacuum cavity combination middle-deep geothermal duct of the embodiment integrates heat collection, heat preservation and heat transmission, only needs to directly embed a finished guide pipe into a middle-deep geothermal area along a drill hole and is connected with a heat exchanger, namely the connection is completed, and the support structure vacuum cavity combination middle-deep geothermal duct has high integration.

In the description of the present invention, it is to be understood that the terms "center", "length", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. The combined mid-deep geothermal heat pipe with the bracket structure vacuum cavity is characterized by comprising an outer pipe and an inner pipe, wherein the bottom of the outer pipe is of a sealing structure, and the top and the bottom of the inner pipe are both of an open structure; a first cavity is formed between the inner pipe and the outer pipe, a second cavity which is axially communicated is arranged in the middle of the inner pipe, the inner pipe is sleeved in the outer pipe, the bottom of the inner pipe is connected with a single-wall pipe which is coaxially arranged, an exchange hole is formed in the single-wall pipe, a communication area is reserved between the bottom of the single-wall pipe and the bottom of the outer pipe, and the first cavity is communicated with the second cavity through the communication area and the exchange hole; the inner pipe is a double-layer pipe, a third cavity is formed between the double-layer pipes, the third cavity is a vacuum cavity, and a heat insulation material is sealed in the third cavity.

2. The carrier-structured vacuum chamber combination mid-deep geothermal heat pipe as claimed in claim 1, wherein the single-walled tube has a plurality of sets of axially arranged exchange holes, each set of the exchange holes being arranged uniformly along a circumference of the single-walled tube.

3. The carrier-structured vacuum chamber combination deep geothermal conduit according to claim 1, wherein the upper end of the single-walled tube is inserted into the third chamber from the bottom of the inner tube and is sealingly connected to the inner tube.

4. The combination medium deep geothermal duct of a scaffold-structured vacuum chamber of claim 1, further comprising a plurality of nylon heat insulating support rings disposed in the third chamber.

5. The scaffold vacuum chamber combination mid-deep geothermal heat pipe according to claim 1, wherein the insulation material sealed in the third chamber comprises aerogel particles and/or microglass fibers.

6. The vacuum chamber combination mid-deep geothermal heat pipe of claim 1, wherein the thermal insulation material is in the form of a ring-shaped structure, and the thermal insulation material is sleeved in the third chamber of the inner pipe; or the heat insulation material is of a linear rope structure, and the linear rope structure is wound in the third cavity.

7. The combination of a scaffold vacuum chamber and a deep geothermal heat pipe according to claim 1, wherein the outer diameter of the outer tube is 200mm to 1000mm, the outer diameter of the inner tube is 120mm to 920mm, the outer diameter of the single-walled tube is 120mm to 920mm, and the diameter of the second chamber is not less than 100mm.

8. The carrier-structured vacuum chamber combination mid-deep geothermal heat pipe according to claim 1, wherein the outer pipe, the inner pipe and the single-walled pipe are made of steel.

9. The carrier-structured vacuum chamber combination mid-deep geothermal heat pipe according to claim 1, wherein the height of the communication region is 2m to 100m.

10. The carrier-structured vacuum chamber combination mid-deep geothermal heat pipe as claimed in claim 1, wherein the top of the inner pipe extends from the top of the outer pipe, the top of the outer pipe is connected with the outer sidewall of the inner pipe in a sealing manner, the top sidewall of the outer pipe is provided with a water return port, and the top of the inner pipe is opened as a water outlet port.