CN111076586A - Variable diameter channel heat pipe and connecting method thereof - Google Patents
Variable diameter channel heat pipe and connecting method thereof Download PDFInfo
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- CN111076586A CN111076586A CN201911195126.8A CN201911195126A CN111076586A CN 111076586 A CN111076586 A CN 111076586A CN 201911195126 A CN201911195126 A CN 201911195126A CN 111076586 A CN111076586 A CN 111076586A
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- heat pipe
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- axial channel
- channel heat
- end cover
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/04—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with tubes having a capillary structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0275—Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0283—Means for filling or sealing heat pipes
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A variable diameter channel heat pipe comprises a plurality of axial channel heat pipes with different section sizes and a plurality of variable diameter joints (4) with different sizes; a plurality of heat pipes with different sections are connected into a special-shaped heat pipe system with an internal axial channel (2) and a steam channel (13) which are communicated with each other through a plurality of reducing joints (4) with different sizes; the joint of each axial channel heat pipe shell and the reducing joint (4) is sealed; in the free ends of two axial channel heat pipe shells at two ends of the special-shaped heat pipe system and the reducing joint (4) which are not connected with each other, a filling end cover (9) is arranged on one free end, and a through hole is formed in the filling end cover (9); the filling pipe (10) is inserted into the through hole of the filling end cover (9) and fixed on the inflating end cover (9); a packaging end cover (11) is arranged on the other free end; after the steam-liquid phase change heat transfer working medium is filled through the filling pipe (10), the filling pipe (10) is sealed.
Description
Technical Field
The invention relates to a variable-diameter channel heat pipe and a connecting method thereof, belonging to the technical field of phase change heat transfer.
Background
The heat pipe has the characteristics of extremely high thermal conductivity, excellent temperature equalization performance, capability of being manufactured in a special shape, high operation reliability and the like, and is widely applied to the fields of energy, chemical engineering, aerospace, electronic element heat dissipation and the like. Sometimes, due to the structural space limitation, the cross section of the heat pipe needs to be designed to be small in size so as to adapt to the narrow space environment. However, since the heat transfer capacity of the heat pipe is inversely proportional to the effective length of the heat pipe when the cross-sectional size of the heat pipe is constant, the length of the heat pipe with a smaller cross-sectional size is limited when the heat transfer power is constant. The method adopted at present is to adopt a heat pipe with a smaller section size to transfer a heat source to a region with a larger space, then further transfer heat to a radiating surface through the heat pipe with the larger section size for radiating, and the connection mode between the heat pipe with the smaller section size and the heat pipe with the larger section size is lap joint. Because the heat pipes are overlapped, the total heat resistance of a transfer path is larger, so that the heat dissipation effect is influenced, the thermal design is complicated, and the design difficulty is increased indirectly.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention aims to provide a variable-diameter channel heat pipe and a connecting method thereof, which can connect channel heat pipes with different diameters into a special-shaped heat pipe system with an internal axial channel and a steam channel communicated with each other, so as to solve the problem of limited length of a small-section heat pipe, replace the original lap joint mode of a large-section heat pipe and a small-section heat pipe and reduce thermal resistance.
The technical scheme adopted by the invention is as follows: a variable diameter channel heat pipe comprises a plurality of axial channel heat pipes with different section sizes and a plurality of variable diameter joints with different sizes;
connecting a plurality of heat pipes with different sections into a special-shaped heat pipe system with an internal axial channel and a steam channel which are mutually communicated through a plurality of reducing joints with different sizes;
the connection part of each axial channel heat pipe shell and the reducing joint is sealed; in the free ends of two axial channel heat pipe shells at two ends of the special-shaped heat pipe system and the reducing joint which are not connected with each other, a filling end cover is arranged on one free end, and a through hole is formed in the filling end cover; the filling pipe is inserted into the through hole of the filling end cover and fixed on the inflating end cover; a packaging end cover is arranged on the other free end; and after the steam-liquid phase change heat transfer working medium is filled through the filling pipe, the filling pipe is sealed.
The pipe shell of the axial channel heat pipe is of a hollow cylindrical structure, the hollow part is a steam channel, a plurality of axial channels are uniformly distributed on the inner wall of the pipe shell along the circumferential direction and used as liquid channels, and liquid and steam carry out heat and mass transfer through a vapor-liquid interface at the opening of the axial channels; the fins are positioned on the outer circumference of the tube shell; a plurality of circumferential grooves are arranged in parallel in the axial direction of the case, the symmetry plane of each circumferential groove is orthogonal to the symmetry plane of the axial groove, and the circumferential grooves are communicated with the axial grooves.
The reducing joint is of a hollow structure, two ends of the reducing joint are of cylindrical structures, and the middle section of the reducing joint is of a circular truncated cone-shaped structure; the hollow part of the middle section is a steam channel which is in a round table shape; a plurality of axial channels are distributed at the large end and the small end of the middle section along the circumferential direction; a metal wire mesh is laid in the reducing joint and clings to the inner wall of the reducing joint; the axial channel and the metal wire mesh form a combined capillary core as a liquid channel, and liquid and steam can transfer heat and mass through a steam-liquid interface at the opening of the axial channel;
the small-diameter end of the reducing joint is in butt joint with the small-section axial channel heat pipe shell, and the large-diameter end of the reducing joint is in butt joint with the large-section axial channel heat pipe shell; at the butt joint part, the axial channels at the small end of the middle section of the variable-diameter joint correspond to the axial channels of the small-section axial channel heat pipe shell one by one, and the steam channels are communicated with the steam channels of the small-section axial channel heat pipe shell; the axial channels of the large end of the middle section of the reducing joint correspond to the axial channels of the large-section axial channel heat pipe shell one by one, and the steam channels are communicated with the steam channels of the large-section axial channel heat pipe shell.
The shape, the size and the size of the steam channel of the large end of the middle section of the reducer union are consistent with those of the axial channel of the large-section axial channel heat pipe;
the shape and size of the axial channel at the small end of the middle section of the reducer union and the size of the steam channel are consistent with those of the axial channel of the small-section axial channel heat pipe;
the connecting method of the variable diameter channel heat pipe comprises the following steps:
(1) processing axial channel heat pipe shells with different section sizes for connection, and removing fins at the end parts of the axial channel heat pipe shells, which are required to be connected with the reducing joints, to form cylindrical ends; processing a sinking groove on the inner side of the end part of the pipe shell for installing a filling end cover or packaging an end cover on the end part of the pipe shell of the axial channel heat pipe, wherein the end part of the pipe shell of the axial channel heat pipe does not need to be connected with the reducer union;
(2) processing at least 3 circumferential channels on the end part of the axial channel heat pipe shell, which is required to be connected with the reducer union;
(3) processing a reducing joint, processing sink grooves at two ends of the reducing joint, wherein the inner diameters of the sink grooves at the two ends are respectively consistent with the outer diameter of the cylindrical end processed by the axial channel heat pipe in the step, and the cross section sizes of a large-diameter end and a small-diameter end of the reducing joint are respectively consistent with the axial cross section sizes of a large-section axial channel heat pipe shell and a small-section axial channel heat pipe shell;
(4) processing a packaging end cover, wherein the packaging end cover is of a cylindrical structure, and the outer diameter of the packaging end cover is consistent with the inner diameter of a sink groove processed by the axial channel heat pipe shell in the step;
(5) processing a filling end cover, wherein the filling end cover is of a cylindrical structure, the outer diameter of the filling end cover is consistent with the inner diameter of a sinking groove processed by the axial channel heat pipe shell in the step, and a through hole is formed in the middle of the filling end cover;
(6) processing a filling pipe, wherein the outer diameter of the filling pipe is consistent with the diameter of the through hole in the middle of the filling end cover;
(7) putting a wire mesh into the reducer union, tightly attaching the wire mesh to the inner wall surface of the reducer union, and forming a combined capillary core in the reducer union together with axial channels on the inner wall surfaces of the large-diameter end and the small-diameter end of the reducer union;
(8) respectively inserting the cylindrical ends of the pipe shells of the axial channel heat pipes processed in the step into the reducing joints and butting the cylindrical ends with the interiors of the reducing joints; the axial channels of the axial channel heat pipe shell are ensured to be in one-to-one correspondence with the axial channels of the reducing joint, the steam channels are in one-to-one correspondence, and a part of the wire mesh in the reducing joint is ensured to be in the axial channel heat pipe and is tightly attached to the inner wall surface of the axial channel heat pipe;
(9) welding, fixing and sealing are carried out under the condition that the pipe shell of the axial channel heat pipe is kept in butt joint with the reducing joint;
(10) placing the filling end cover into a sink groove at the free end of the axial channel heat pipe, and welding, fixing and sealing;
(11) inserting the filling pipe into the through hole of the filling end cover, and welding, fixing and sealing;
(12) and placing the packaging end cover into the sinking grooves at other free ends of the axial channel heat pipe shell, and welding, fixing and sealing.
Compared with the prior art, the invention has the advantages that:
(1) the invention can connect a plurality of axial channel heat pipes with different section sizes together through the reducer union to form a special-shaped heat pipe system with the internal axial channel and the steam channel communicated with each other, effectively solves the problem of limited length of the heat pipe with smaller section size, replaces the original lap joint mode of the heat pipe with larger section size and the heat pipe with smaller section size, and improves the heat transfer effect.
(2) The heat pipe shells with the plurality of axial channels are connected through the reducing joints to form a special-shaped heat pipe system with the internal axial channels and the steam channel communicated with each other, the heat pipe with the small cross section can adapt to a narrow space environment, and meanwhile, heat is further transferred to a radiating surface for radiating through the heat pipe with the larger cross section size, so that the heat transfer effect is improved, meanwhile, the height increase caused by the lap joint of 2 layers of heat pipes is avoided, the thermal design is simplified, and the design difficulty is reduced.
(3) The end opening of the channel heat pipe is internally provided with a plurality of circumferential channels which are arranged in parallel, each circumferential channel is communicated with the axial channel, and the reducing joint is internally provided with a wire mesh capillary core, so that the liquid working medium can be uniformly distributed in the axial channels along the circumferential channels and the wire mesh capillary core after being shunted;
(4) the reducing joint and the inner wall of the inner gas channel at the port of one end of the channel heat pipe are provided with the metal wire meshes, the metal wire meshes in the channel heat pipe are contacted with the metal wire meshes in the gas channel of the reducing joint, and the capillary force for flowing of the liquid working medium can be increased through the metal wire meshes, so that the liquid working medium can be uniformly distributed in the axial channel along the metal wire meshes during shunting.
Drawings
FIG. 1 is a schematic cross-sectional view of two different cross-sectional dimensions of a grooved heat pipe connection with circumferential grooves.
FIG. 2 is a view of the large diameter end of the reducer union.
FIG. 3 is a schematic cross-sectional view of a reducer union.
FIG. 4 is a schematic view of a reducer union.
FIG. 5 is a schematic view of two different cross-sectional dimensions of a grooved heat pipe connection with circumferential grooves.
Detailed Description
The following detailed description of the present invention will be made in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the variable diameter channel heat pipe provided by the present invention comprises a plurality of axial channel heat pipes with different cross-sectional dimensions, and a plurality of variable diameter joints 4 with different dimensions; the pipe shell of the axial channel heat pipe is of a hollow cylindrical structure, the hollow part is a steam channel 13, as shown in figure 2, a plurality of axial channels 2 with micro-size openings are arranged on the inner wall of the pipe shell in parallel at intervals along the circumferential direction and are used as liquid channels, and liquid and steam can carry out heat and mass transfer through a vapor-liquid interface at the openings of the axial channels 2. The fins are positioned on the outer circumference of the tube shell and used for fixedly mounting the tube shell and increasing the heat conduction area of the tube; a plurality of circumferential channels 5 are arranged in parallel, the symmetry plane of each circumferential channel 5 being orthogonal to the symmetry plane of the axial channel 2, the circumferential channels 5 being in continuous communication with the axial channel 2.
The heat pipe shell with the axial channels can be processed into the heat pipe shell with the axial channels 2 by extrusion forming, and then the circumferential channels 5 are processed in an electric spark mode.
As shown in FIG. 1 and FIG. 5, the axial channel heat pipe shells with different sections and circumferential grooves can be connected through the reducer union 4 to form a special-shaped heat pipe system with the internal axial channels and the steam channels 13 communicated with each other.
As shown in fig. 1, the reducer union 4 is a hollow structure, two ends are cylindrical structures, and the middle section is a truncated cone structure; one end is larger in diameter and is called the large diameter end 3, and the other end is smaller in diameter and is called the small diameter end 6. The hollow part of the middle section is a steam channel 13 and is also in a round platform structure; the sizes of the axial channels of the large end and the small end of the middle section and the size of the steam channel 13 are respectively completely consistent with those of the large-section axial channel heat pipe 1 and the small-section axial channel heat pipe 8; a metal wire mesh 7 is laid in the reducing joint 4, and the metal wire mesh 7 is tightly attached to the inner wall of the reducing joint 4; the axial channel 2 and the wire mesh 7 form a combined capillary core of the reducer joint 4 as a liquid channel, and liquid and steam can transfer heat and mass through a vapor-liquid interface at the opening of the axial channel.
As shown in fig. 1, the hollow structure inside the reducer union 4 can be machined by wire cutting, and then the axial grooves 2 at the large-diameter end 3 and the small-diameter end 6 can be machined by electric spark. The size, the number and the circumferential arrangement mode of the axial grooves at the large-diameter end 3 part are consistent with those of the axial grooves of the large-section axial groove heat pipe 1; the size, the number and the circumferential arrangement mode of the axial grooves at the small-diameter end 6 are consistent with those of the axial grooves of the small-section axial groove heat pipe 8. A metal wire mesh 7 is laid in the reducing joint 4, the metal wire mesh 7 is tightly attached to the inner wall of the reducing joint 4, and the metal wire mesh 7 is used for communicating the axial channels of the large-diameter end 3 and the small-diameter end 6 to form a combined capillary core in the reducing joint 4.
As shown in figure 1, a pipe shell of the large-section axial channel heat pipe 1 is inserted into a large-diameter end 3 of a reducing joint 4, and a pipe shell of the small-section axial channel heat pipe 8 is inserted into a small-diameter end 6 of the reducing joint 4. At the butt joint part, the axial channels of the axial channel heat pipe shells are ensured to be in one-to-one correspondence with the axial channels 2 in the reducing joint 4, the steam channels 13 of the axial channel heat pipe shells are ensured to be in one-to-one correspondence with the steam channels 13 in the reducing joint 4, and the metal wire mesh 7 laid on the inner wall surface of the reducing joint 4 is ensured to stretch into one part of the inner parts of the axial channel heat pipe shells.
As shown in fig. 1 and 5, a plurality of heat pipes with different sections are connected into a special-shaped heat pipe system with an internal axial channel 2 and a steam channel 13 communicated with each other through a plurality of reducing joints 4 with different sizes; the joint of the axial channel heat pipe shell and the reducing joint 4 needs to be welded and sealed. In the free ends of two axial channel heat pipe shells at two ends of the special-shaped heat pipe system and the reducer union 4 which are not connected with each other, a free end is provided with a sinking groove with a certain depth, the inner diameter of the sinking groove ensures a certain positive tolerance, a filling end cover 9 is arranged in the sinking groove at the free end, and the filling end cover 9 and the axial channel pipe shells are welded into a whole; a through hole is formed in the middle of the filling end cover 9, the aperture of the through hole ensures certain positive tolerance, a filling pipe 10 with the outer diameter matched with the through hole is inserted into the through hole, and the filling pipe 10 and the filling end cover 9 are welded into a whole; and a sink groove with a certain depth is also processed at the other free end, the diameter of the sink groove ensures a certain positive tolerance, a packaging end cover 11 is placed in the sink groove at the free end, and the packaging end cover 11 and the axial channel heat pipe shell are welded into a whole.
After welding of all parts needing to be welded of the special-shaped heat pipe system is completed, the special-shaped heat pipe system needs to be connected with a pressurizing device through the filling pipe 10 to perform a pressurizing test on the special-shaped heat pipe system, and the fact that after the pressurizing test is performed, all welded parts are good in quality is guaranteed. After the pressurizing test, the filling pipe 10 is required to be connected with helium mass spectrum leakage detection equipment to perform helium quality leakage detection on the special-shaped heat pipe system, so that the total leakage rate is ensured to meet certain requirements.
After a pressurizing test and helium plain leak detection are carried out, and the detection result meets the requirement, the special-shaped heat pipe system is filled with working medium through the filling pipe 10. After filling, the filler tube 10 needs to be cold welded and sealed.
The axial channel heat pipe shell, the reducer union 4, the filling end cap 9, the filling pipe 10 and the packaging end cap 11 are made of materials compatible with vapor-liquid phase change heat transfer working media.
When a certain pipe shell part in the special-shaped channel heat pipe system is heated, the liquid working medium in the axial channel of the part absorbs heat and evaporates to become high-pressure steam which enters the steam channel 13, the high-pressure steam enters any other part of the special-shaped heat pipe system except the heated part through the steam channel 13 which is communicated with each other and is condensed into liquid working medium at any other part, the liquid working medium flows back to the heated evaporation part along the axial channel or the capillary core 12 which is communicated with each other by the action of capillary suction force generated by the heated evaporation part, and thus the heat transfer and the temperature equalization of the special-shaped heat pipe system are realized by the flowing of the working medium and the phase change of the steam.
A connecting method of a variable diameter channel heat pipe comprises the following specific implementation steps:
(1) processing axial channel heat pipe shells with different diameters for connection, and removing fins with certain length from the end part of the axial channel heat pipe shell, which is required to be connected with the reducer union 4, to form a cylindrical end with certain length; processing a sinking groove with a certain length on the inner side of the end part of the pipe shell for installing a filling end cover 9 or a packaging end cover 11 on the end part of the pipe shell of the axial channel heat pipe, which is not required to be connected with the reducer union 4;
(2) on the basis of the step (1), processing at least 3 circumferential grooves 5 with certain intervals on the end part of the axial groove heat pipe shell, which is required to be connected with the reducer union 4, wherein the plane of the circumferential grooves 5 is orthogonal to the plane of the axial grooves;
(3) processing a reducing joint 4, processing sink grooves with certain length at two ends of the reducing joint 4, wherein the inner diameters of the sink grooves at the two ends are respectively consistent with the outer diameter of a cylindrical end processed by the axial channel heat pipe in the step 1, and the section sizes (including the number of axial channels, the size of the axial channels and the size of a steam channel 13) of a large-diameter end 3 and a small-diameter end 6 of the reducing joint 4 are respectively completely consistent with the axial section sizes of a large-section axial channel pipe shell and a small-section axial channel pipe shell;
(4) processing a packaging end cover 11, wherein the packaging end cover 11 is of a cylindrical structure, and the outer diameter of the packaging end cover is consistent with the inner diameter of a sink groove processed in the axial channel heat pipe shell in the step (1);
(5) processing a filling end cover 9, wherein the filling end cover 9 is of a cylindrical structure, the outer diameter of the filling end cover is consistent with the inner diameter of a sinking groove processed in the other axial channel heat pipe shell in the step (1), and a through hole is formed in the middle of the filling end cover 9;
(6) processing a filling pipe 10, wherein the outer diameter of the filling pipe 10 is consistent with the diameter of a through hole in the middle of a filling end cover 9;
(7) placing the wire mesh 7 into the reducer union 4 and tightly adhering to the inner wall surface of the reducer union 4;
(8) respectively inserting the cylindrical ends of the pipe shells of the axial channel heat pipes processed in the step 1 into the reducing joints 4, and butting the cylindrical ends with the interiors of the reducing joints 4; the axial channels of the axial channel heat pipe shell are ensured to be in one-to-one correspondence with the axial channels of the reducing joint 4, the steam channels 13 are in one-to-one correspondence, and a part of the wire mesh 7 in the reducing joint 4 is ensured to be in the axial channel heat pipe and is tightly attached to the inner wall surface of the axial channel heat pipe;
(9) welding, fixing and sealing are carried out under the condition that the pipe shell of the axial channel heat pipe is kept in butt joint with the reducing joint 4;
(10) placing the filling end cover 9 into a sink groove at the free end of the axial channel heat pipe, and welding, fixing and sealing;
(11) inserting the filling pipe 10 into the through hole of the filling end cover 9, and welding, fixing and sealing;
(12) and (3) placing the packaging end cover 11 into the sinking grooves at other free ends of the axial channel heat pipe shell, and welding, fixing and sealing to complete connection.
The present invention has not been described in detail, partly as is known to the person skilled in the art.
Claims (6)
1. A variable diameter channel heat pipe is characterized by comprising a plurality of axial channel heat pipes with different section sizes and a plurality of variable diameter joints (4) with different sizes;
a plurality of heat pipes with different sections are connected into a special-shaped heat pipe system with an internal axial channel (2) and a steam channel (13) which are communicated with each other through a plurality of reducing joints (4) with different sizes;
the joint of each axial channel heat pipe shell and the reducing joint (4) is sealed; in the free ends of two axial channel heat pipe shells at two ends of the special-shaped heat pipe system and the reducing joint (4) which are not connected with each other, a filling end cover (9) is arranged on one free end, and a through hole is formed in the filling end cover (9); the filling pipe (10) is inserted into the through hole of the filling end cover (9) and fixed on the inflating end cover (9); a packaging end cover (11) is arranged on the other free end; after the steam-liquid phase change heat transfer working medium is filled through the filling pipe (10), the filling pipe (10) is sealed.
2. The variable diameter channel heat pipe of claim 1, wherein: the pipe shell of the axial channel heat pipe is of a hollow cylindrical structure, the hollow part is a steam channel (13), a plurality of axial channels (2) are uniformly distributed on the inner wall of the pipe shell along the circumferential direction and are used as liquid channels, and liquid and steam carry out heat and mass transfer through a steam-liquid interface at the opening of the axial channel (2); the fins are positioned on the outer circumference of the tube shell; a plurality of circumferential grooves (5) are arranged in parallel along the axial direction of the pipe shell, the symmetry plane of each circumferential groove (5) is orthogonal to the symmetry plane of the axial groove, and the circumferential grooves (5) are communicated with the axial grooves (2).
3. A variable diameter channel heat pipe according to claim 2, wherein: the reducing joint (4) is of a hollow structure, two ends of the reducing joint are of cylindrical structures, and the middle section of the reducing joint is of a circular truncated cone-shaped structure; the hollow part of the middle section is a steam channel (13), and the steam channel (13) is in a circular truncated cone shape; a plurality of axial channels (2) are distributed at the large end and the small end of the middle section along the circumferential direction; a metal wire mesh (7) is laid in the reducing joint (4), and the metal wire mesh (7) is tightly attached to the inner wall of the reducing joint (4); the axial channel (2) and the wire mesh (7) form a combined capillary core as a liquid channel, and liquid and steam can carry out heat and mass transfer through a vapor-liquid interface at the opening of the axial channel;
the small-diameter end (6) of the reducing joint (4) is in butt joint with the pipe shell of the small-section axial channel heat pipe (8), and the large-diameter end (3) is in butt joint with the pipe shell of the large-section axial channel heat pipe (1); at the butt joint part, the axial channels (2) at the small end of the middle section of the reducer union (4) correspond to the axial channels (2) of the pipe shell of the small-section axial channel heat pipe (8) one by one, and the steam channels (13) are communicated with the steam channels (13) of the pipe shell of the small-section axial channel heat pipe (8); the axial channels (2) at the large end of the middle section of the variable-diameter joint (4) correspond to the axial channels (2) of the tube shell of the large-section axial channel heat pipe (1) one by one, and the steam channels (13) are communicated with the tube shell steam channels (13) of the large-section axial channel heat pipe (1).
4. A variable diameter channel heat pipe as claimed in claim 3, wherein: the shape and the size of the axial channel (2) at the large end of the middle section of the reducer union (4) and the size of the steam channel (13) are consistent with those of the axial channel (2) of the large-section axial channel heat pipe (1) and the size of the steam channel (13).
5. The variable diameter channel heat pipe of claim 4, wherein: the shape and the size of the axial channel (2) at the small end of the middle section of the reducer union (4) and the size of the steam channel (13) are consistent with the shape and the size of the axial channel (2) of the axial channel heat pipe (8) with the small section and the size of the steam channel (13).
6. The connecting method of a heat pipe with variable diameter channels as claimed in any one of claims 1 to 5, comprising the steps of:
(1) processing axial channel heat pipe shells with different section sizes for connection, and removing fins at the end parts, required to be connected with the reducing joints (4), of the axial channel heat pipe shells to form cylindrical ends; the end part of the axial channel heat pipe shell, which is not required to be connected with the reducer union (4), is processed with a sinking groove at the inner side of the end part of the pipe shell for installing a filling end cover (9) or a packaging end cover (11);
(2) processing at least 3 circumferential channels (5) on the end part of the axial channel heat pipe shell, which is required to be connected with the reducer union (4);
(3) processing a reducing joint (4), processing sink grooves at two ends of the reducing joint (4), wherein the inner diameters of the sink grooves at the two ends are respectively consistent with the outer diameter of the cylindrical end processed by the axial channel heat pipe in the step (1), and the cross-sectional sizes of a large-diameter end (3) and a small-diameter end (6) of the reducing joint (4) are respectively consistent with the axial cross-sectional sizes of a pipe shell of the large-section axial channel heat pipe (1) and a pipe shell of the small-section axial channel heat pipe (8);
(4) processing a packaging end cover (11), wherein the packaging end cover (11) is of a cylindrical structure, and the outer diameter of the packaging end cover is consistent with the inner diameter of a sink groove processed by the axial channel heat pipe shell in the step (1);
(5) processing a filling end cover (9), wherein the filling end cover (9) is of a cylindrical structure, the outer diameter of the filling end cover is consistent with the inner diameter of a sinking groove processed by the axial channel heat pipe shell in the step (1), and a through hole is drilled in the middle of the filling end cover (9);
(6) processing a filling pipe (10), wherein the outer diameter of the filling pipe (10) is consistent with the diameter of a through hole in the middle of a filling end cover (9);
(7) a metal wire mesh (7) is placed in the reducing joint and is tightly attached to the inner wall surface of the reducing joint (4), and the metal wire mesh and the axial channels of the inner wall surfaces of the large-diameter end (3) and the small-diameter end (6) of the reducing joint (4) form a combined capillary core in the reducing joint (4);
(8) respectively inserting the cylindrical ends of the pipe shells of the axial channel heat pipes processed in the step (1) into the reducing joints (4) and butting the cylindrical ends with the interiors of the reducing joints (4); the axial channels of the axial channel heat pipe shell are ensured to be in one-to-one correspondence with the axial channels of the reducing joint (4), the steam channels (13) are in one-to-one correspondence, and a part of the wire mesh (7) in the reducing joint (4) is ensured to be in the axial channel heat pipe and is tightly attached to the inner wall surface of the axial channel heat pipe;
(9) welding, fixing and sealing are carried out under the condition that the pipe shell of the axial channel heat pipe is kept in butt joint with the reducing joint (4);
(10) placing a filling end cover (9) into a sink groove at the free end of the axial channel heat pipe, and welding, fixing and sealing;
(11) inserting the filling pipe (10) into the through hole of the filling end cover (9), and welding, fixing and sealing;
(12) and placing the packaging end cover (11) into the sinking grooves at other free ends of the axial channel heat pipe shell, and welding, fixing and sealing.
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| CN201911195126.8A CN111076586A (en) | 2019-11-28 | 2019-11-28 | Variable diameter channel heat pipe and connecting method thereof |
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| CN201911195126.8A CN111076586A (en) | 2019-11-28 | 2019-11-28 | Variable diameter channel heat pipe and connecting method thereof |
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| CN111076586A true CN111076586A (en) | 2020-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114812235A (en) * | 2021-05-14 | 2022-07-29 | 北京中石伟业科技宜兴有限公司 | Reducing heat pipe and manufacturing method thereof |
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Application publication date: 20200428 |