CN112856061B - Phase-change material pouring heat-preservation sealing pipeline joint convenient to disassemble and assemble and method thereof - Google Patents
Phase-change material pouring heat-preservation sealing pipeline joint convenient to disassemble and assemble and method thereof Download PDFInfo
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- CN112856061B CN112856061B CN202011614329.9A CN202011614329A CN112856061B CN 112856061 B CN112856061 B CN 112856061B CN 202011614329 A CN202011614329 A CN 202011614329A CN 112856061 B CN112856061 B CN 112856061B
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- 239000012782 phase change material Substances 0.000 title claims abstract description 80
- 238000007789 sealing Methods 0.000 title claims abstract description 40
- 238000004321 preservation Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 10
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims abstract description 117
- 239000012530 fluid Substances 0.000 claims abstract description 38
- 230000008859 change Effects 0.000 claims abstract description 16
- 230000010412 perfusion Effects 0.000 claims abstract description 16
- 230000009466 transformation Effects 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 5
- 230000003446 memory effect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 2
- 239000012071 phase Substances 0.000 abstract description 39
- 239000007791 liquid phase Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 150000005846 sugar alcohols Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/006—Screw-threaded joints; Forms of screw-threads for such joints with straight threads
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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
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
The invention discloses a phase change material perfusion heat preservation sealing pipeline joint convenient to disassemble and assemble and a method thereof, wherein the joint comprises a pipe body with a hollow inner part, spiral memory alloy is welded on the inner walls of an input end and an output end which are opposite to the pipe body to serve as internal threads, and a perfusion hole is arranged on the pipe wall and is used for perfusing a phase change material after the joint is connected with a pipe to be connected, so that the phase change material fills a gap between the inner wall surface of the pipe body and the wall surface of the pipe to be connected; and one end of the filling hole, which faces the outer side of the pipe wall, is provided with a detachable sealing bolt. The solid-liquid phase change characteristic of the phase change material can be utilized to enable the phase change material to penetrate into the gaps of the pipe fittings to strengthen the sealing performance; the pipe can be fastened by using the deformation characteristics of the low-temperature phase and the high-temperature phase of the memory alloy, the disassembly and the assembly are convenient, the phase-change material is fully filled in the internal gap of the pipe body, and the sealing property is enhanced; the phase-change material can be used for releasing thermal characteristics, the temperature nonuniformity of the transported fluid can be reduced, and the temperature control protection of the fluid at the joint of the pipeline is realized.
Description
Technical Field
The invention relates to the field of medium and low temperature fluid transportation and energy storage and heat preservation, in particular to a phase change material pouring heat preservation sealing pipeline joint convenient to disassemble and assemble and a method thereof.
Background
The pipeline is a device for transporting gas, liquid or multiphase flow mixed fluid, and is widely applied to the field of fluid transportation in the industries of energy, chemical engineering, biology and the like. The pipe joint is a connecting piece for connecting two pipes, and is used for connecting pipes with the same pipe diameter or different pipe diameters and ensuring the sealing performance of the pipes. With the enlargement of the industrialized scale in China, the technical requirements of the existing working environment on pipelines and pipeline joints are higher and higher, and with the increase of the types of fluids in the pipelines and the increase of the temperature of transported fluids, the pipeline joints often face the problems of leakage, aging, inconvenient disassembly and assembly and the like. In order to overcome the above difficulties, the pipe joint in the prior art generally only considers the sealing performance, and the heat insulation performance and the disassembly and assembly convenience are less considered.
A phase change material is an energy storage material that uses latent heat to store and release thermal energy. Because the solar energy heat storage device has the advantages of high heat storage density, wide temperature range distribution, almost unchanged temperature in use, stable chemical property, corrosion resistance and the like, the solar energy heat storage device is also widely used in the field of temperature control protection. In the prior art, phase change materials have been used in pipe casing, but less for temperature controlled protection of pipe joints. For fluids transported over long distances, the heat loss at the pipe joints can affect equipment operating conditions and system economics to some extent.
Disclosure of Invention
Aiming at the technical difficulties, the invention provides a phase-change material pouring heat-preservation sealing pipeline joint convenient to disassemble and assemble and a method thereof. The sealing and heat preservation between the pipeline joint and the pipeline are realized by utilizing the melting and solidifying characteristics of the phase-change material, the heat is absorbed by melting and is converted into liquid state to fill the connecting gap, and the heat is released by solidification to realize the temperature protection of the fluid and fix the fluid in the gap. The temperature deformation characteristic of the memory metal is utilized to realize the fastening and sealing between the pipeline joint and the pipeline, the sealing and leakage prevention of the poured phase-change material are realized by utilizing the sealing bolt, and the connection of two pipes and the filling of the phase-change material can be realized by utilizing the hollow pipe body inside.
The technical scheme of the invention is as follows:
the invention provides a phase change material perfusion heat preservation sealing pipeline joint convenient to disassemble and assemble, which comprises a hollow pipe body, wherein the pipe body comprises an input end and an output end which are opposite, spiral memory alloy is welded on the inner walls of the input end and the output end to serve as internal threads, a plurality of perfusion holes penetrating through the pipe wall are formed in the pipe walls of the input end and the output end, and the perfusion holes are used for perfusing a phase change material after the joint is connected with a pipe to be connected, and enabling the phase change material to fill a gap between the inner wall surface of the pipe body and the wall surface of the pipe to be connected; the one end of filling hole towards the pipe wall outside is equipped with detachable sealing bolt, sealing bolt passes through the sealed screw thread that the internal face of filling hole set up and is connected with the filling hole cooperation.
In a preferred embodiment of the present invention, at least a portion of the spiral memory alloy is not welded to the inner wall of the connector in the input end and the output end.
In a preferred embodiment of the present invention, the spiral memory alloy is welded to the inner wall of the joint at only two ends in the input end and the output end.
In a preferable scheme of the invention, the memory alloy adopts a memory alloy with a two-way memory effect, the high-temperature phase-change state temperature of the memory alloy is 5-10 ℃ higher than the phase-change temperature of the phase-change material, the low-temperature phase-change temperature of the memory alloy is lower than the working medium temperature in the tube, when the environment temperature is between the low-temperature phase-change state temperature and the high-temperature phase-change state temperature of the memory alloy, the memory alloy is in an intermediate thread state, when the environment temperature of the memory alloy is higher than the high-temperature phase-change state temperature of the memory alloy, the memory alloy contracts, and when the environment temperature is lower than the low-temperature phase-change temperature of the memory alloy, the memory alloy stretches.
The invention also provides a phase-change material pouring, heat-insulating and sealing method of the pipeline joint, which comprises the following steps:
when the pipe is installed in an initial state, the environment temperature of the memory alloy is controlled to be lower than the low-temperature phase change state temperature of the memory alloy, the memory alloy is in a stretching state, and compared with the middle thread state when the memory alloy is at the temperature between the low-temperature phase change state temperature and the high-temperature phase change state temperature, when the memory alloy is in the stretching state, the memory alloy generates outward expansion force in the radial direction or the radial size of the memory alloy is enlarged due to stretching, and at the moment, the pipe to be connected is screwed into the pipe body from the input end and the output end respectively;
after screwing in, injecting the overheated liquid phase-change material into the pipe body from the filling hole until the phase-change material is filled in the gap between the inner wall surface of the pipe body and the wall surface of the screwed-in pipe and filled in the filling hole, and transferring heat to the memory alloy by the overheated phase-change material to enable the memory alloy to reach the high-temperature phase-change state temperature and shrink.
Furthermore, when the temperature of the fluid in the pipe is higher than the high-temperature phase-change temperature of the memory alloy, the memory alloy shrinks, and the phase-change material is in a liquid state and is filled in the filling hole and the gap between the pipe body and the memory alloy and screwed into the wall surface of the pipe, so that the sealing property of the pipe body is enhanced; when the temperature of the fluid in the pipe is reduced to generate fluctuation, the phase-change material transfers heat to the fluid, and a good heat preservation effect is achieved.
Furthermore, when the joint is disassembled, fluid transportation is stopped, the ambient temperature of the memory alloy is reduced to the low-temperature phase-change state temperature of the memory alloy, the memory alloy stretches at the moment, the size of the memory alloy in the radial direction is increased due to stretching, and two pipes screwed in the pipe body can be screwed out.
Preferably, the calibers of the input end and the output end can be the same or different, and can be used for connecting two pipes with the same pipe diameter and also can be used for connecting two pipes with different pipe diameters.
Preferably, the input end with the output outside is equipped with the guide way, the guide way internal diameter slightly is greater than the internal diameter of input and output, and the guide way internal diameter reduces from outside to inside gradually, and at last equals with the internal diameter of input and output.
Preferably, a fluid channel is arranged between the input end and the output end, and the inner diameter of the fluid channel is smaller than the inner diameters of the input end and the output end.
Preferably, the filling hole radially runs through the pipe body from the outer side of the pipe body to the input end and the output end.
The cross section of the perfusion hole can be circular, square or any other plane two-dimensional pattern, and preferably, the shape of the circular hole which is convenient for injecting the phase-change material can be selected.
Preferably, the pore size of the perfusion pores should be selected to facilitate the flow of the phase change material, and should be considered to accommodate a suitable injection amount of the phase change material.
The phase change material used in the invention can be any known phase change material, preferably, the selected phase change material has the characteristics of slightly higher phase change temperature than the temperature of a transport fluid, high unit volume phase change enthalpy, small volume change in the phase change process, high heat conductivity coefficient, small viscosity, good cyclic heat stability, stable chemical property, difficult dissolution in the transport fluid and no toxicity. In an alternative embodiment, sugar alcohol based phase change materials with a phase change temperature of 60-70 deg.C may be selected. CuZnAl alloy with high temperature phase transformation temperature of 75 ℃ and low temperature phase transformation temperature of 25 ℃ can be selected.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention adopts the memory alloy with the two-way memory effect, so that the memory alloy can present three different states at different environmental temperatures. When the ambient temperature is lower than the low-temperature phase change temperature of the memory alloy, the memory alloy is in an extension state, so that the tube can be conveniently screwed into the hollow tube body from the input end and the output end respectively; when the environment temperature is higher than the high-temperature phase-change temperature of the memory alloy, the memory alloy is in a contraction state, and the effect of fastening a screwed pipe can be achieved; when the temperature is between the low-temperature phase transition state temperature and the high-temperature phase transition state temperature, the memory alloy is in an intermediate spiral state between the stretching state and the stretching state. The invention utilizes the deformation characteristics of the memory alloy in low-temperature phase and high-temperature phase to fasten the pipe, is convenient to assemble and disassemble, and ensures that the phase-change material fully fills the internal clearance of the pipe body to enhance the sealing property.
(2) The overheated liquid phase-change material is injected into the tube body from the filling hole until the phase-change material is filled in the whole filling hole, the phase-change material transfers heat to the memory alloy to enable the memory alloy to reach high-temperature phase-change state temperature and shrink, the memory alloy shrinks and then fastens the pipeline and promotes the phase-change material to permeate into a gap between the tube body and the memory alloy, and the sealing performance of the tube body is further enhanced.
(3) When the temperature of the transport fluid is higher than the melting temperature of the phase-change material, the phase-change material is in a liquid state, the phase-change material can absorb heat and fill the filling hole and the gap between the tube body and the memory alloy, the tightness of the tube body is enhanced, when the temperature of the transport fluid is reduced to generate fluctuation, the phase-change material close to the side of the fluid is solidified into a solid state from the liquid state, latent heat is released, heat is transferred to the fluid in the tube, and a good heat preservation effect is achieved.
(4) The invention can realize the disassembly of the pipeline joint without an external tool, and embodies the characteristic of easy disassembly and assembly. The invention can reduce the temperature unevenness of the transported fluid and realize temperature control protection on the fluid at the joint of the pipeline; the invention has wide range of selectable phase-change materials, can select the phase-change material which is insoluble in transport fluid and is nonhazardous, and ensures safe and reliable operation; the device has high flexibility and strong adaptability, can be used for various fluid conveying pipelines, and has strong universality.
Drawings
FIG. 1 is a schematic structural view of a phase change material pouring heat preservation sealing pipeline joint convenient to disassemble and assemble.
Fig. 2 is a schematic structural view of the phase change material pouring heat preservation sealing pipeline joint convenient to disassemble and assemble when being inserted into a pipe.
In the drawings, the list of components is as follows:
1, a pipe body; 2, phase change material; 3, memory alloy; 4, sealing the bolt; 5, an input end; 6, output end; 7, filling a hole; and 8, sealing the threads.
Detailed Description
In order to make the objects, features, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the phase change material perfusion heat preservation sealed pipeline joint convenient to disassemble and assemble comprises a hollow pipe body 1, wherein the pipe body 1 comprises an input end 5 and an output end 6 which are opposite, spiral memory alloy 3 is welded on the inner walls of the input end 5 and the output end 6 to serve as internal threads, a plurality of perfusion holes 7 penetrating through the pipe wall are formed in the pipe walls of the input end 5 and the output end 6, the perfusion holes 7 are used for perfusing a phase change material 2 after the joint is connected to a pipe to be connected, and the phase change material 2 is filled in a gap between the inner wall surface of the pipe body 1 and the wall surface of the pipe to be connected; the one end of pouring hole 7 towards the pipe wall outside is equipped with detachable sealing bolt 4, sealing bolt 4 is connected with pouring hole 7 cooperation through the sealed screw thread 8 that the internal face of pouring hole 7 set up.
As a preferred embodiment of the present invention, a plurality of the perfusion holes 7 are uniformly distributed on the tube walls of the input end 5 and the output end 6 along the axial direction and/or the circumferential direction of the tube body.
In a preferred embodiment of the present invention, at least a portion of the spiral memory alloy 3 is not welded to the inner wall of the joint in the input end 5 and the output end 6.
In one embodiment of the present invention, only two ends of the spiral memory alloy 3 are welded to the inner wall of the joint in the input end 5 and the output end 6. The memory alloy 3 adopts a memory alloy with a two-way memory effect, the high-temperature phase transformation temperature of the memory alloy 3 is higher than the phase transformation temperature of the phase-change material 3 by 5 ℃, the low-temperature phase transformation temperature of the memory alloy 3 is lower than the working temperature in the pipe, when the environment temperature is between the low-temperature phase transformation temperature and the high-temperature phase transformation temperature of the memory alloy, the memory alloy is in the thread state, when the environment temperature of the memory alloy 3 is higher than the high-temperature phase transformation temperature of the memory alloy 3, the memory alloy 3 contracts, and because the two ends are fixed by the inner wall of the joint, when the memory alloy 3 contracts, the radial size (diameter) of the middle part of the memory alloy can be reduced or an inward tightening force can be generated in the radial direction under the condition that the deformation is restrained; when the environment temperature is lower than the low-temperature phase transformation temperature of the memory alloy 3, the memory alloy 3 stretches, and because the two ends are fixed by the inner wall of the joint, when the memory alloy 3 stretches, the radial dimension (diameter) of the middle part of the memory alloy becomes larger or an outward force is generated in the radial direction under the condition that the deformation is restrained.
Preferably, the memory alloy 3 forms an internal thread matching the thread of the pipe to be connected in the intermediate thread state.
In one embodiment of the invention, the working fluid is hot water, the delivery temperature of which is in the range of 50-90 ℃. In the embodiment, the memory alloy 3 is selected from a CuZnAl alloy, the high-temperature phase transformation temperature of the CuZnAl alloy is 75 ℃, and the low-temperature phase transformation temperature of the CuZnAl alloy is 25 ℃; the phase-change material 2 is paraffin, and the phase-change temperature is 70 ℃.
Preferably, the calibers of the input end and the output end can be the same or different, and can be used for connecting two pipes with the same pipe diameter and also can be used for connecting two pipes with different pipe diameters.
Preferably, the input end with the output outside is equipped with the guide way, the guide way internal diameter slightly is greater than the internal diameter of input and output, and the guide way internal diameter reduces from outside to inside gradually, and at last equals with the internal diameter of input and output.
Preferably, a fluid channel is arranged between the input end and the output end, and the inner diameter of the fluid channel is smaller than the inner diameters of the input end and the output end.
The cross section of the perfusion hole can be circular, square or any other plane two-dimensional pattern, and preferably, the shape of the circular hole which is convenient for injecting the phase-change material can be selected.
Preferably, the pore size of the perfusion pores should be selected to facilitate the flow of the phase change material, and should be considered to accommodate a suitable injection amount of the phase change material.
As shown in fig. 1 and 2, when the pipe is installed in the initial state, the environment temperature of the memory alloy 3 is controlled to be lower than the low-temperature phase transformation temperature of the memory alloy 3, the memory alloy 3 is in the stretching state, and compared with the middle thread state when the memory alloy 3 is at the temperature between the low-temperature phase transformation temperature and the high-temperature phase transformation temperature, the size of the memory alloy 3 in the radial direction is increased or outward expansion force is generated due to stretching in the stretching state, and at this time, the pipes to be connected are screwed into the pipe body 1 from the input end 5 and the output end 6 respectively;
after screwing in, the overheated liquid phase change material 2 is injected into the tube body 1 from the filling hole 7 until the phase change material 2 is filled in a gap between the inner wall surface of the tube body 1 and the wall surface of the screwed-in tube and filled in the filling hole 7, the phase change material 2 transfers heat to the memory alloy 3 to enable the memory alloy 3 to reach high-temperature phase change state temperature and shrink, compared with a middle thread state, when in the shrink state, the size of the memory alloy 3 in the radial direction is reduced or inward tightening force is generated due to shrinkage, the screwed-in tube is fastened, the phase change material 2 is enabled to permeate into the gap between the tube body 1 and the memory alloy 3, the sealing performance of the tube body 1 is further enhanced, and finally, the sealing bolt 4 is screwed in the outer side of the filling hole 7 to complete installation.
When the temperature of the fluid in the pipe is higher than the melting temperature of the phase-change material 2, the phase-change material 2 is in a liquid state, the memory alloy 3 contracts, and the phase-change material 2 is filled in the filling hole 7 and the gap between the pipe body 1 and the memory alloy 3, so that the sealing performance of the pipe body 1 is enhanced, and when the temperature of the fluid in the pipe is reduced to generate fluctuation, the phase-change material 2 transfers heat to the fluid in the pipe, so that a good heat preservation effect is achieved.
When the joint is disassembled, fluid transportation is stopped, when the ambient temperature is reduced to the low-temperature phase transformation temperature of the memory alloy 3, the memory alloy 3 is stretched, and the two pipelines screwed in the pipe body 1 can be screwed out. The pipeline joint can be disassembled without an external tool, and the characteristic of easy disassembly and assembly is embodied.
In one embodiment of the invention, the phase change material is in a superheated state during injection, and the heat imparted to the memory alloy is sufficient to bring it to the high temperature phase change state temperature. The memory alloy is in a spiral shape in low-temperature phase, intermediate phase and high-temperature phase, the tightness degree is different, the intermediate phase can be well matched with the pipe, the pipe cannot fall off, the high-temperature phase can firmly lock the pipe, and the low-temperature phase is loose and convenient to screw in and screw out. In daily operation, because the temperature of the fluid is in a range (both above the low phase temperature), above the high phase transition temperature the memory alloy contracts, and below this temperature the memory alloy fits well into the tube, although not in its contracted state. During assembly, liquid phase-change materials penetrate into the gaps, and at the moment, some solidified phase-change materials close to the pipe or the near memory alloy side can also play a role in fastening the pipe.
Those skilled in the art will appreciate that the drawings are only schematic illustrations of preferred embodiments, the above embodiments are only provided for describing the embodiments, and the above embodiments are only examples for implementing the invention and do not represent the advantages and disadvantages of the embodiments. The above-mentioned embodiments are merely preferred embodiments of the present invention, but the implementation manner of the present invention is not limited by the above-mentioned embodiments, and any other modifications and amendments made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (8)
1. The phase change material perfusion heat-preservation sealed pipeline joint convenient to disassemble and assemble is characterized by comprising a hollow pipe body (1), wherein the pipe body (1) comprises an input end (5) and an output end (6) which are opposite, spiral memory alloy (3) is welded on the inner walls of the input end (5) and the output end (6) to serve as internal threads, a plurality of perfusion holes (7) which penetrate through the pipe wall are formed in the pipe walls of the input end (5) and the output end (6), the perfusion holes (7) are used for perfusing a phase change material (2) after the joint is connected to a pipe to be connected, and the phase change material (2) is enabled to fill a gap between the inner wall surface of the pipe body (1) and the wall surface of the pipe to be connected; one end of the filling hole (7) facing the outer side of the pipe wall is provided with a detachable sealing bolt (4), and the sealing bolt (4) is matched and connected with the filling hole (7) through a sealing thread (8) arranged on the inner wall surface of the filling hole (7);
the memory alloy (3) adopts a memory alloy with a two-way memory effect, the high-temperature phase transformation temperature of the memory alloy (3) is 5-10 ℃ higher than the phase transformation temperature of the phase-change material (2), the low-temperature phase transformation temperature of the memory alloy (3) is lower than the working medium temperature in the pipe, when the environment temperature is between the low-temperature phase transformation temperature and the high-temperature phase transformation temperature of the memory alloy (3), the memory alloy (3) is in an intermediate thread state, when the environment temperature of the memory alloy (3) is higher than the high-temperature phase transformation temperature of the memory alloy (3), the memory alloy (3) contracts, and when the environment temperature is lower than the low-temperature phase transformation temperature of the memory alloy (3), the memory alloy (3) stretches.
2. The phase change material pouring heat preservation sealing pipeline joint convenient to disassemble and assemble as claimed in claim 1, characterized in that the pouring holes (7) are multiple and evenly distributed on the pipe wall of the input end (5) and the output end (6) along the axial direction and/or the circumferential direction of the pipe body.
3. The easy-to-disassemble and assemble phase-change material pouring heat preservation sealing pipeline joint is characterized in that at least one section of the spiral memory alloy (3) in the input end (5) and the output end (6) is not welded with the inner wall of the joint.
4. The phase change material pouring heat preservation sealing pipeline joint convenient to disassemble and assemble as claimed in claim 1, characterized in that, in the input end (5) and the output end (6), only two ends of the spiral memory alloy (3) are welded on the inner wall of the joint.
5. The phase-change material pouring heat-preservation sealed pipeline joint convenient to disassemble and assemble as claimed in claim 1, wherein when the memory alloy (3) is in the middle thread state, the formed internal thread is matched with the thread of a pipeline to be connected.
6. A method for pouring, insulating and sealing a phase-change material into a pipeline joint according to claim 1, which comprises the following steps:
when the pipe is installed in an initial state, the environment temperature of the memory alloy (3) is controlled to be lower than the low-temperature phase change state temperature of the memory alloy (3), the memory alloy (3) is in a stretching state, compared with the middle thread state when the memory alloy (3) is at the temperature between the low-temperature phase change state temperature and the high-temperature phase change state temperature, when the memory alloy (3) is in the stretching state, outward expansion force is generated in the radial direction or the radial size of the memory alloy (3) is increased due to stretching, and at the moment, the pipes to be connected are screwed into the pipe body (1) from the input end (5) and the output end (6) respectively;
after screwing in is finished, the overheated liquid phase-change material (2) is injected into the pipe body (1) from the filling hole (7) until the phase-change material (2) is filled in a gap between the inner wall surface of the pipe body (1) and the wall surface of the screwed-in pipe and filled in the filling hole (7), the overheated phase-change material (2) transfers heat to the memory alloy (3) to enable the memory alloy (3) to reach the high-temperature phase-change state temperature to shrink, compared with the middle thread state, when in the shrink state, the memory alloy (3) generates inward tightening force in the radial direction or the radial size of the memory alloy is reduced due to shrinkage, the screwed-in pipe is fastened, the phase-change material (2) is enabled to penetrate into the gap between the pipe body (1) and the memory alloy (3), the sealing performance of the pipe body (1) is further enhanced, and finally, the sealing bolt (4) is screwed in the outer side of the filling hole (7) to complete installation.
7. The method of claim 6, wherein: when the temperature of the fluid in the pipe is higher than the high-temperature phase transformation temperature of the memory alloy (3), the memory alloy (3) contracts, the phase-change material (2) is in a liquid state and is filled in the filling hole (7) and the gap between the pipe body (1) and the memory alloy (3) and screwed into the wall surface of the pipe, and the sealing performance of the pipe body (1) is enhanced; when the temperature of the fluid in the pipe is reduced to generate fluctuation, the phase-change material (2) transfers heat to the fluid, and a good heat preservation effect is achieved.
8. The method of claim 6, wherein: when the connector is disassembled, the fluid transportation is stopped, the ambient temperature of the memory alloy (3) is reduced to the low-temperature phase transformation temperature of the memory alloy (3), at the moment, the memory alloy (3) stretches, the size of the memory alloy (3) in the radial direction is enlarged due to the stretching, and two pipes screwed in the pipe body (1) can be screwed out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011614329.9A CN112856061B (en) | 2020-12-30 | 2020-12-30 | Phase-change material pouring heat-preservation sealing pipeline joint convenient to disassemble and assemble and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011614329.9A CN112856061B (en) | 2020-12-30 | 2020-12-30 | Phase-change material pouring heat-preservation sealing pipeline joint convenient to disassemble and assemble and method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112856061A CN112856061A (en) | 2021-05-28 |
| CN112856061B true CN112856061B (en) | 2022-01-18 |
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|---|---|---|---|
| CN202011614329.9A Active CN112856061B (en) | 2020-12-30 | 2020-12-30 | Phase-change material pouring heat-preservation sealing pipeline joint convenient to disassemble and assemble and method thereof |
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| Country | Link |
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| CN (1) | CN112856061B (en) |
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| US20090206552A1 (en) * | 2008-02-14 | 2009-08-20 | Schlumberger Technology Corp. | Shape memory (alloy) hermetic seal and threaded joint incorporating same |
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| CN106244114A (en) * | 2016-07-08 | 2016-12-21 | 浙江大学 | A kind of phase-change accumulation energy temperature-controlling system based on mobile foam metal and method |
| CN106885089A (en) * | 2017-03-02 | 2017-06-23 | 浙江大学 | A kind of cold heat bidirectional protective device and method for jet chimney |
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| CN209430935U (en) * | 2018-12-25 | 2019-09-24 | 成都辉腾塑胶有限公司 | A kind of hot melt pipe fitting |
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2020
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| US20090206552A1 (en) * | 2008-02-14 | 2009-08-20 | Schlumberger Technology Corp. | Shape memory (alloy) hermetic seal and threaded joint incorporating same |
| CN101545565A (en) * | 2008-03-28 | 2009-09-30 | 王广武 | Phase-transition energy-storage constant-temperature compound infusion tube |
| CN205400593U (en) * | 2016-03-23 | 2016-07-27 | 西南石油大学 | Utilize memory alloy's unsteady cover bearing of spiral roller bit |
| CN106244114A (en) * | 2016-07-08 | 2016-12-21 | 浙江大学 | A kind of phase-change accumulation energy temperature-controlling system based on mobile foam metal and method |
| CN106885089A (en) * | 2017-03-02 | 2017-06-23 | 浙江大学 | A kind of cold heat bidirectional protective device and method for jet chimney |
| CN207486263U (en) * | 2017-11-27 | 2018-06-12 | 张家界大峡谷信息科技有限责任公司 | A kind of concrete bell-and-spigot pipe of mud jacking sealing |
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| CN112856061A (en) | 2021-05-28 |
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