CN113790316A - Multi-cavity heat-insulation flow guide pipe with heat insulation structure and preparation method thereof - Google Patents
Multi-cavity heat-insulation flow guide pipe with heat insulation structure and preparation method thereof Download PDFInfo
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- CN113790316A CN113790316A CN202111142676.0A CN202111142676A CN113790316A CN 113790316 A CN113790316 A CN 113790316A CN 202111142676 A CN202111142676 A CN 202111142676A CN 113790316 A CN113790316 A CN 113790316A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
- F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
- F24T10/17—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes using tubes closed at one end, i.e. return-type tubes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Thermal Insulation (AREA)
Abstract
The invention relates to a multi-cavity heat-insulation guide pipe with a heat-insulation structure and a preparation method thereof, belonging to the technical field related to heat-insulation guide. The multi-cavity heat-insulation flow guide 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 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, a communication area is reserved between the bottom of the inner pipe and the bottom of the outer pipe, and the first cavity is communicated with the second cavity through the communication area; and a third cavity is formed between the inner side wall and the outer side wall of the inner pipe, the third cavity is a vacuum cavity, and a heat-insulating material is sealed in the third cavity. The invention can be used for a middle-deep geothermal energy utilization system, realizes the comprehensive utilization effect of small floor area, low loss of geothermal energy and zero influence on the ecological environment, can meet the heating requirement of buildings and agriculture without using high-grade energy for heat supplement, and achieves the maximum utilization efficiency of the geothermal energy.
Description
Technical Field
The invention relates to the technical field related to heat insulation and flow guidance, in particular to a multi-cavity heat insulation flow guide pipe with a heat insulation structure and a preparation method thereof.
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. the shallow layer can be utilized, so that the shallow layer underground water is utilized as a cold and heat source. The three technical forms are basically shallow or surface geothermal 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 which exists on the surface of the earth crust and is exposed to the atmosphere, such as river water, lake water, reservoir water and the like, has great 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 a large area of pipelines need to be buried for providing quantitative heat energy; the ground source heat pump occupies a large area, has large engineering quantity and 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. Limited by underground heat resources, the application is limited; 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 only has the function of heat conduction liquid closed circulation without directly pumping underground water, the pipe does not have the heat insulation performance, and the outer side of the pipe can be wrapped with a flexible heat insulation material for reducing heat energy loss. The heat-insulating material for the general sealed pipe member is rock wool, glass wool, rubber-plastic sponge and the like, the sealed 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.
Disclosure of Invention
In order to solve one or more of the above technical problems, the present invention provides a multi-cavity heat insulation flow guide tube with a heat insulation structure and a preparation method thereof.
The technical scheme for solving the technical problems is as follows: a multi-cavity heat insulation flow guide pipe with a heat insulation structure 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 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, a communication area is reserved between the bottom of the inner pipe and the bottom of the outer pipe, and the first cavity is communicated with the second cavity through the communication area; and a third cavity is formed between the inner side wall and the outer side wall of the inner pipe, the third cavity is a vacuum cavity, and a heat-insulating material is sealed in the third cavity.
The invention has the beneficial effects that: the invention adopts a three-layer cavity structure, a first cavity between an inner pipe and an outer pipe is used as a heat collecting cavity, a third cavity carried by the inner pipe is used as a heat insulation cavity, a second cavity in the center of the inner pipe is used as a heat conveying cavity, the heat insulation cavity is positioned between the heat collecting cavity and the heat conveying cavity in the middle of an integral flow guide pipe, the heat insulation cavity is of an independent closed structure and is not communicated with other two cavities, and heat transfer between the heat collecting cavity and the heat conveying cavity can be well isolated by using the heat insulation cavity. The multi-cavity heat-insulation guide pipe can be used for a middle-deep geothermal energy utilization system, achieves the comprehensive utilization effect of small floor area, low loss of geothermal energy and zero influence on ecological environment, can meet the heating requirement of buildings and agriculture without using high-grade energy for heat compensation, and achieves the maximum utilization efficiency of geothermal energy.
On the basis of the technical scheme, the invention can be further improved as follows.
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 aerogel particles are used as a heat insulation material, and 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, so that the aerogel particles have a good heat insulation effect.
Further, the third cavity is an annular cavity.
The beneficial effect of adopting the further scheme is that: the first and second cavities may be thermally insulated.
Further, the first cavity is an annular cavity.
The beneficial effect of adopting the further scheme is that: the first cavity and the second cavity which are communicated through the communicating area form a U-shaped circulating flow channel, and circulating flow guide of fluids with different temperatures can be carried out in one flow guide pipe.
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 further scheme is that: 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.
Further, be equipped with thermal-insulated lock ring in the first cavity, thermal-insulated lock ring cover is established on the lateral wall of inner tube, thermal-insulated lock ring respectively with the lateral wall of inner tube and the inside wall butt of outer tube.
The beneficial effect of adopting the further scheme is that: in order to ensure the size of the first cavity serving as the heat collecting cavity, a plurality of heat insulation support rings can be arranged in the first cavity between the inner pipe and the outer pipe, the heat insulation support rings are arranged at intervals along the axial direction of the flow guide pipe, and the heat insulation support rings are made of materials with certain mechanical properties and low heat conductivity coefficients, so that heat transfer is avoided as far as possible.
Further, thermal-insulated lock ring includes circle body and supporting legs, circle body cover is established on the lateral wall of inner tube, an organic whole is connected with a plurality of supporting legs on the outer loop lateral wall of circle body, and is a plurality of the supporting legs are followed the circumference interval of circle body is arranged, the supporting legs with the inside wall butt of outer tube.
The beneficial effect of adopting the further scheme is that: utilize circle body and supporting legs cooperation to form thermal-insulated lock ring, when guaranteeing to support intensity, occupy the circulation space in the first cavity as far as possible.
A preparation method of the multi-cavity heat-insulation flow guide pipe with the heat-insulation structure comprises the following steps: sleeving the two steel pipes together to form a double-layer steel pipe, welding and sealing one end of the double-layer steel pipe, wherein a cavity between the double-layer steel pipe is a third cavity; filling a heat-insulating material into the third cavity, vacuumizing the welding edge at the other end of the double-layer steel pipe, and forming an inner pipe with a sealed vacuum cavity after welding; the inner pipe is sleeved in the outer pipe, and a communication area is reserved between the bottom of the inner pipe and the bottom of the outer pipe.
The invention has the beneficial effects that: according to the preparation method, the two steel pipes are sleeved together to form the double-layer steel pipe, so that the sealing is convenient, and the structural strength is stable. The double-layer steel pipe is vacuumized while being welded, and the vacuum degree of the third cavity is guaranteed to meet the requirement of heat insulation.
Furthermore, before the inner pipe is sleeved in the outer pipe, the heat insulation support ring is sleeved on the outer side wall of the inner pipe, and then the inner pipe is integrally inserted into the outer pipe.
The beneficial effect of adopting the further scheme is that: the heat-insulating support ring is sleeved on the outer side wall of the inner pipe, so that the heat-insulating support ring is convenient to install, and the subsequent inner pipe can be assembled into the outer pipe conveniently.
And further, filling a heat insulation material into the third cavity, specifically, pressing aerogel particles into a ring-shaped heat insulation material, and then filling the ring-shaped heat insulation material into the third cavity.
The beneficial effect of adopting the further scheme is that: the aerogel particles are pressed into a ring shape, so that the third cavity can be filled conveniently, the heat preservation effect is good, and the subsequent vacuumizing operation is facilitated.
Drawings
FIG. 1 is a schematic view of the overall structure of an axial section of a multi-chamber adiabatic draft tube according to the present invention;
FIG. 2 is a schematic view of the axial cross section of the multi-chamber adiabatic draft tube of the present invention in a partially enlarged configuration;
FIG. 3 is a schematic view of the radial profile of the multi-chamber insulated flow conduit of the present invention;
FIG. 4 is a schematic structural view of the heat insulating support ring of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. an outer tube; 11. a water return port;
2. an inner tube; 21. a steel pipe; 22. a water outlet;
3. a first cavity; 4. a second cavity; 5. a third cavity; 6. a connected region;
7. a heat-insulating support ring; 71. a ring body; 72. a support bar; 73. a support plate; 74. a semicircular ring; 75. a bolt;
8. a thermal insulation material;
9. a heat exchanger; 10. a natural ground; 101. a shallow geothermal region; 102. the geothermal region of the middle and deep layers.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 to 3, the multi-cavity heat-insulating flow guide tube with a heat-insulating structure of the present embodiment includes an outer tube 1 and an inner tube 2, wherein the bottom of the outer tube 1 is a sealed structure, and the top and the bottom of the inner tube 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 communicated is arranged in the middle of the inner tube 2, the inner tube 2 is sleeved in the outer tube 1, a communication area 6 is reserved between the bottom of the inner tube 2 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; a third cavity 5 is formed between the inner side wall and the outer side wall of the inner pipe 2, the third cavity 5 is a vacuum cavity, and a heat insulation material 8 is sealed in the third cavity 5.
Wherein, the heat insulation material 8 sealed in the third cavity 5 is aerogel particles. Aerogel particles are used as the heat insulation material, and the thermal conductivity coefficient lambda of the aerogel particles is 0.014W/(m.K). The third cavity 5 is an independent sealing structure, a vacuum cavity with an aerogel particle insulating layer is formed by vacuumizing, 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, and the heat insulating effect is good. Because the heat insulation material 8 is filled in the whole third cavity 5 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, the heat insulation is not only arranged in a frozen soil layer, and the heat loss of the terrestrial heat from deep to shallow is greatly reduced.
As shown in fig. 1 to 3, the third cavity 5 of the present embodiment is an annular cavity. The first cavity and the second cavity can be insulated by adopting the annular third cavity.
As shown in fig. 1 to 3, the first cavity 3 of the present embodiment is an annular cavity. The first cavity and the second cavity which are communicated with each other through the communication area form a U-shaped circulation flow channel, and circulation flow guiding of fluids with different temperatures can be performed in one flow guiding pipe.
As shown in fig. 1, the top of the inner tube 2 of this embodiment extends from the top of the outer tube 1, the top of the outer tube 1 is connected to the outer side wall of the inner tube 2 in a sealing manner, a water return port 11 is opened on the side wall of the top of the outer tube 1, and the top of the inner tube 2 is opened to form a water outlet 22. The inner pipe 2 and the outer pipe 1 are effectively connected together, and the water return port 11 and the water outlet 22 are respectively used for connecting the heat exchanger 9, so that the whole structure is compact and reliable.
As shown in fig. 3 and 4, in the present embodiment, a heat insulation support ring 7 is disposed in the first cavity 3, the heat insulation support ring 7 is sleeved on the outer sidewall of the inner tube 2, and the heat insulation support ring 7 is respectively abutted against the outer sidewall of the inner tube 2 and the inner sidewall of the outer tube 1. In order to ensure the size of the first cavity serving as the heat collecting cavity, a plurality of heat insulation support rings can be arranged in the first cavity between the inner pipe and the outer pipe, the heat insulation support rings are arranged at intervals along the axial direction of the flow guide pipe, and the heat insulation support rings are made of materials with certain mechanical properties and low heat conductivity coefficients, so that heat transfer is avoided as far as possible.
As shown in fig. 3 and 4, the heat insulation support ring 7 of this embodiment includes a ring body 71 and support legs, the ring body 71 is sleeved on the outer side wall of the inner tube 2, the outer ring side wall of the ring body 71 is integrally connected with a plurality of support legs, the support legs are arranged along the circumferential direction of the ring body 71 at intervals, and the support legs are abutted against the inner side wall of the outer tube 1. Utilize circle body and supporting legs cooperation to form thermal-insulated lock ring, when guaranteeing to support intensity, occupy the circulation space in the first cavity as far as possible.
A specific solution of this embodiment about thermal-insulated lock ring 7 is, as shown in fig. 4, the circle body 71 of this embodiment includes two semicircle rings 74, can form a complete annular circle body 71 after docking two semicircle rings 74, can set up a complete supporting foot on two semicircle rings 74 respectively, also can set up half supporting feet at the both ends of semicircle ring respectively, after two semicircle rings 74 dock, half supporting feet at two ends of two semicircle rings 74 dock each other, and the rethread is connected through bolt 75 and is formed a complete supporting foot. Two semicircular rings 74 are connected to form a ring body 71, so that the ring body 71 is conveniently sleeved between the inner pipe 2 and the outer pipe.
One specific solution of this embodiment is that the support foot includes a support rod 72 and a support plate 73, the support rod 72 is fixed on the outer sidewall of the ring body 71 along the radial direction, and then the support plate 73 is fixed on the free end of the support rod 72. The support plate 73 may be an arc-shaped plate and is fitted to the inner side wall of the outer tube.
All the pipes of the embodiment are made of high-strength steel, and have good corrosion resistance in a humid environment.
As shown in fig. 1 and 2, a multi-chamber insulated flow guide tube having an insulated structure is buried under a natural ground 10 so as to pass through a shallow geothermal region 101 (within 200m under the natural ground 10 and at a temperature lower than 25 ℃) and to extend into a medium geothermal region 102 (within 3000m under the natural ground 10 and at a temperature higher than 25 ℃). The water return port 11 of the outer pipe 1 is communicated with the water outlet of the heat exchanger 9, the water outlet 22 of the inner pipe 2 is communicated with the water inlet of the heat exchanger 9, so that water in the heat exchanger 9 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 the terrestrial heat enters the heat exchanger 9 along the second cavity 4 of the inner pipe 2.
The multicavity adiabatic honeycomb duct with adiabatic structure of this embodiment adopts the three-layer cavity structure, 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 hot transport chamber, adiabatic cavity is in the intermediate position of whole honeycomb duct, it adopts between hot cavity and the hot transport chamber to be located, 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 to adopt the heat transfer between hot cavity and the hot transport chamber. The multi-cavity heat insulation guide pipe with the heat insulation structure integrates heat collection, heat preservation and heat transmission, only the finished guide pipe is directly embedded into a middle-deep geothermal area along a drill hole and is connected with a heat exchanger, namely, the connection is completed, and the multi-cavity heat insulation guide pipe with the heat insulation structure has high integration.
The multi-cavity heat insulation guide pipe of the embodiment can be used for a middle-deep geothermal energy utilization system, achieves the comprehensive utilization effect of small occupied area, low loss of geothermal energy and zero influence on ecological environment, does not need to use high-grade energy sources for heat supplement, can meet the heating requirement of buildings and agriculture, and achieves the maximum utilization efficiency of geothermal energy.
Example 2
A method of making a multi-lumen, insulated flow conduit of the type described in example 1 having an insulating construction, comprising the steps of: sleeving the two steel pipes 21 together to form a double-layer steel pipe, welding and sealing one end of the double-layer steel pipe, and forming a third cavity 5 as a cavity between the double-layer steel pipe; filling a heat insulation material 8 into the third cavity 5, vacuumizing the welding edge at the other end of the double-layer steel pipe, and forming the inner pipe 2 with a sealed vacuum cavity after welding; the inner tube 2 is sleeved in the outer tube 1, and a communication area 6 is reserved between the bottom of the inner tube 2 and the bottom of the outer tube 1.
Specifically, 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.
Before the inner tube 2 is sleeved in the outer tube 1, the heat insulation support ring 7 is sleeved on the outer side wall of the inner tube 2, and then the inner tube 2 is integrally inserted into the outer tube 1. The heat-insulating support ring is sleeved on the outer side wall of the inner pipe, so that the heat-insulating support ring is convenient to install, and the subsequent inner pipe can be assembled into the outer pipe conveniently.
Filling the heat insulation material 8 into the third cavity 5, specifically, pressing the aerogel particles into a ring-shaped heat insulation material 8 with an axial length of 300-500mm, and then filling the ring-shaped heat insulation material 8 into the third cavity 5. The aerogel particles are pressed into a ring shape, so that the third cavity can be filled conveniently, the heat preservation effect is good, and the subsequent vacuumizing operation is facilitated.
According to the preparation method, the two steel pipes are sleeved together to form the double-layer steel pipe, so that the sealing is convenient, and the structural strength is stable. The double-layer steel pipe is vacuumized while being welded, and the vacuum degree of the third cavity is guaranteed to meet the requirement of heat insulation.
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, as used herein, refer to an orientation or positional relationship illustrated in the drawings, which is used for convenience and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be considered as limiting.
Furthermore, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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," "secured," and the like are to be construed broadly and can, 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 connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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.
Although 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 can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A multi-cavity heat insulation flow guide pipe with a heat insulation structure 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, a communication area is reserved between the bottom of the inner pipe and the bottom of the outer pipe, and the first cavity is communicated with the second cavity through the communication area; and a third cavity is formed between the inner side wall and the outer side wall of the inner pipe, the third cavity is a vacuum cavity, and a heat-insulating material is sealed in the third cavity.
2. The multi-cavity thermal insulation flow guide tube with the thermal insulation structure as claimed in claim 1, wherein the thermal insulation material sealed in the third cavity comprises aerogel particles or/and ultra-fine glass fibers.
3. The multi-cavity heat-insulation flow guide pipe with the heat insulation structure as claimed in claim 1, wherein the top of the inner pipe extends out from 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 manner, 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 opened to form a water outlet.
4. The multi-cavity heat-insulation flow guide pipe with the heat-insulation structure as claimed in claim 1, wherein a heat-insulation support ring is arranged in the first cavity, the heat-insulation support ring is sleeved on the outer side wall of the inner pipe, and the heat-insulation support ring is respectively abutted against the outer side wall of the inner pipe and the inner side wall of the outer pipe.
5. The multi-cavity heat-insulation flow guide pipe with the heat-insulation structure as claimed in claim 4, wherein the heat-insulation support ring comprises a ring body and support legs, the ring body is sleeved on the outer side wall of the inner pipe, a plurality of support legs are integrally connected to the outer ring side wall of the ring body, the support legs are arranged at intervals along the circumferential direction of the ring body, and the support legs are abutted against the inner side wall of the outer pipe.
6. A method of making a multi-chamber, insulated flow conduit with an insulating construction according to any of claims 1 to 5, wherein: the method comprises the following steps: sleeving the two steel pipes together to form a double-layer steel pipe, welding and sealing one end of the double-layer steel pipe, wherein a cavity between the double-layer steel pipe is a third cavity; filling a heat-insulating material into the third cavity, vacuumizing the welding edge at the other end of the double-layer steel pipe, and forming an inner pipe with a sealed vacuum cavity after welding; the inner pipe is sleeved in the outer pipe, and a communication area is reserved between the bottom of the inner pipe and the bottom of the outer pipe.
7. The method of claim 6, wherein the heat insulating support ring is fitted on the outer sidewall of the inner tube before the inner tube is fitted in the outer tube, and then the inner tube is integrally inserted into the outer tube.
8. The method according to claim 6, wherein the third cavity is filled with an insulation material, specifically, the aerogel particles are compressed into a ring-shaped insulation material, and the ring-shaped insulation material is filled into the third cavity.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111142676.0A CN113790316A (en) | 2021-09-28 | 2021-09-28 | Multi-cavity heat-insulation flow guide pipe with heat insulation structure and preparation method thereof |
| CN202221137788.7U CN217977794U (en) | 2021-09-28 | 2022-05-12 | Multi-cavity heat insulation flow guide pipe with heat insulation structure |
| PCT/CN2022/100323 WO2023050914A1 (en) | 2021-09-28 | 2022-06-22 | Multi-cavity adiabatic flow guide pipe having adiabatic construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111142676.0A CN113790316A (en) | 2021-09-28 | 2021-09-28 | Multi-cavity heat-insulation flow guide pipe with heat insulation structure and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
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| CN113790316A true CN113790316A (en) | 2021-12-14 |
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| CN202111142676.0A Pending CN113790316A (en) | 2021-09-28 | 2021-09-28 | Multi-cavity heat-insulation flow guide pipe with heat insulation structure and preparation method thereof |
| CN202221137788.7U Active CN217977794U (en) | 2021-09-28 | 2022-05-12 | Multi-cavity heat insulation flow guide pipe with heat insulation structure |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221137788.7U Active CN217977794U (en) | 2021-09-28 | 2022-05-12 | Multi-cavity heat insulation flow guide pipe with heat insulation structure |
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| Country | Link |
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| CN (2) | CN113790316A (en) |
| WO (1) | WO2023050914A1 (en) |
Cited By (2)
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| WO2023050914A1 (en) * | 2021-09-28 | 2023-04-06 | 等熵循环(北京)新能源科技有限公司 | Multi-cavity adiabatic flow guide pipe having adiabatic construction |
| WO2023216372A1 (en) * | 2022-05-12 | 2023-11-16 | 等熵循环(北京)新能源科技有限公司 | Medium-deep geothermal guiding pipe having combined vacuum cavities with support structure |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2023050914A1 (en) | 2023-04-06 |
| CN217977794U (en) | 2022-12-06 |
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