CN111006529A - Double-evaporator loop heat pipe - Google Patents
Double-evaporator loop heat pipe Download PDFInfo
- Publication number
- CN111006529A CN111006529A CN201911381597.8A CN201911381597A CN111006529A CN 111006529 A CN111006529 A CN 111006529A CN 201911381597 A CN201911381597 A CN 201911381597A CN 111006529 A CN111006529 A CN 111006529A
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- China
- Prior art keywords
- evaporator
- condenser
- heat pipe
- loop heat
- double
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Classifications
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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
- F28D15/043—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 forming loops, e.g. capillary pumped loops
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2029—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant with phase change in electronic enclosures
- H05K7/20336—Heat pipes, e.g. wicks or capillary pumps
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention belongs to the field of loop heat pipes, and particularly discloses a double-evaporator loop heat pipe, which comprises a first evaporator, a second evaporator, a first steam transmission pipeline, a second steam transmission pipeline, a condenser, a mixer and a liquid transmission pipeline, wherein: the first evaporator and the second evaporator are respectively connected with the inlet of the condenser through a first vapor transmission pipeline and a second vapor transmission pipeline, condensed liquid generated in the condenser is firstly mixed in the mixer and then is respectively sent to the first evaporator and the second evaporator through the liquid transmission pipelines, and therefore the double-evaporator loop heat pipe is formed. The invention can meet the requirements of large-area heat dissipation or heat dissipation of a plurality of heat sources, effectively improves the heat dissipation efficiency of the loop heat pipe, and simultaneously adopts the independent steam transmission pipeline to ensure that the steam in the first evaporator and the second evaporator enters the condenser through the respective steam transmission pipelines, thereby avoiding the interference among the evaporators and enhancing the stability and the operation controllability of the loop heat pipe.
Description
Technical Field
The invention belongs to the field of loop heat pipes, and particularly relates to a double-evaporator loop heat pipe.
Background
The loop heat pipe is a separated heat pipe, has the advantages of large transmission heat flow, flexible pipeline arrangement, no movable part and the like, and has wide application prospect in the aspects of aerospace heat control and heat dissipation of ground high-heat-flow electronic devices.
The loop heat pipe mainly comprises an evaporator, a steam/liquid transmission pipeline, a condenser and the like, wherein the capillary core is arranged in the evaporator, and a cavity between the capillary core and the shell of the evaporator forms a compensation cavity. The working principle is as follows: one surface of the evaporator is tightly attached to the wall surface of the equipment needing heat dissipation, when the equipment starts to work, the waste heat generated heats the wall surface of the evaporator, the heat promotes the working medium in the evaporator to generate phase change evaporation, the generated steam flows into the condenser along the steam channel on the capillary core or the evaporator cover plate and the steam transmission pipeline, the steam is condensed into supercooled liquid in the condenser, the supercooled liquid flows back to the compensation cavity through the liquid transmission pipeline to supply liquid to the evaporation surface, and after the working medium completes the circulation of the evaporation and condensation process, the heat is taken from the evaporator to the condenser to be dissipated, so that the purpose of heat dissipation and temperature control of the running equipment is achieved.
However, the existing flat plate evaporator loop heat pipe is mainly suitable for a heat dissipation system with a small area and a single heat source. With the integrated development of high-power electronic devices, the heat dissipation requirements of spacecrafts and large space stations are increasing day by day, and especially under the conditions of high heat flow and multi-heat source distribution, the existing flat plate type evaporator loop heat pipe cannot meet the heat dissipation requirements. The double-evaporator loop heat pipe is disclosed in CN201010564421.9, and the heat dissipation efficiency of the loop heat pipe is improved by the double-evaporator, but in this scheme, each steam branch enters the condenser after the main trunk is converged, which may cause mutual interference between each evaporator, and thus the system stability is reduced.
Disclosure of Invention
In view of the above drawbacks and needs of the prior art, the present invention provides a dual-evaporator loop heat pipe, wherein a first evaporator and a second evaporator having independent vapor transmission pipelines are correspondingly designed in combination with the features of the loop heat pipe, so as to effectively solve the problem of mutual interference between the evaporators, and thus, the dual-evaporator loop heat pipe is particularly suitable for high heat flow heat dissipation applications.
In order to achieve the above object, the present invention provides a dual-evaporator loop heat pipe, which includes a first evaporator, a second evaporator, a first vapor transmission pipeline, a second vapor transmission pipeline, a condenser, a mixer, and a liquid transmission pipeline, wherein: the first evaporator and the second evaporator are respectively connected with the inlet of the condenser through a first steam transmission pipeline and a second steam transmission pipeline, so that steam generated by the first evaporator and the second evaporator respectively enters the condenser to be condensed, mutual interference between the two evaporators is avoided, the outlet of the condenser is respectively connected with the first evaporator and the second evaporator through the mixer and the liquid transmission pipeline, and is used for mixing liquid generated by condensation in the mixer and then respectively sending the mixed liquid into the first evaporator and the second evaporator, and therefore the double-evaporator loop heat pipe is formed.
As a further preference, the first evaporator and the second evaporator are flat plate evaporators.
As a further preference, the compensation chamber inlets of the first and second evaporators are connected by a pipe bridge.
Further preferably, the pipe bridge is a metal pipe with a smooth inner wall or a metal pipe with a built-in wire mesh.
As a further preference, the mixer is in the shape of a square chamber or a cylinder.
As a further preference, the condenser is a double-pipe condenser, a tube-fin condenser or a radiant plate condenser.
As a further preference, the number of condensers is one or two.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the first evaporator and the second evaporator are coupled in a set of loop heat pipes, so that the requirement of large-area heat dissipation or heat dissipation of a plurality of heat sources can be met, and the heat dissipation efficiency of the loop heat pipes is effectively improved;
2. particularly, the flat plate type evaporator is adopted, the heat dissipation efficiency of the loop heat pipe can be further improved, and the first evaporator and the second evaporator are connected through the pipe bridge, so that the thermodynamic and hydraulic connection between the two evaporators is enhanced, and the heat transfer performance of the loop heat pipe is enhanced;
3. the invention also optimizes the selection of the pipe bridge, the mixer and the condenser, and can further improve the heat dissipation efficiency of the loop heat pipe.
Drawings
FIG. 1 is a schematic diagram of a dual evaporator loop heat pipe constructed in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of a flat plate evaporator according to a preferred embodiment of the present invention;
FIG. 3 illustrates an operation condition of a single evaporator start-up under a heat load of 100W for a dual-evaporator loop heat pipe provided by an embodiment of the present invention;
FIG. 4 shows the operation condition of the dual-evaporator loop heat pipe provided by the embodiment of the present invention when two evaporators are simultaneously started under a thermal load of 10W-10W;
FIG. 5 shows the operation condition of the dual-evaporator loop heat pipe provided by the embodiment of the present invention when two evaporators are simultaneously started under the thermal load of 80W-80W;
FIG. 6 shows the operation condition of the dual-evaporator loop heat pipe provided by the embodiment of the present invention when two evaporators are simultaneously started under a heat load of 130W-130W;
FIG. 7 is an operating condition of a dual-evaporator loop heat pipe provided by an embodiment of the present invention, where two evaporators start up simultaneously under a heat load of 30W-20W;
FIG. 8 illustrates a continuous operating condition of a dual evaporator loop heat pipe under a thermal load according to an embodiment of the present invention;
FIG. 9 is a schematic diagram showing the structure of a parallel-connection flat-plate type double-evaporator loop heat pipe according to a comparative example of the present invention;
FIG. 10 is a working condition of the parallel double-evaporator loop heat pipe provided by the comparative example of the invention, wherein two evaporators are started simultaneously under 40W-40W heat load, then the heat load of the second evaporator is removed, and the first evaporator continues to run;
FIG. 11 is a working condition that two evaporators start up simultaneously under 40W-40W heat load, then the heat load of the first evaporator is removed, and the second evaporator continues to run.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-a first evaporator, 2-a second evaporator, 3-a first vapor transmission pipeline, 4-a second vapor transmission pipeline, 5-a refrigerant outlet, 6-a condenser, 7-a refrigerant inlet, 8-a mixer, 9-a liquid transmission pipeline, 10-a pipe bridge, 11-an upper shell plate, 12-a heating surface, 13-a capillary core, 14-an evaporator outlet, 15-a compensation cavity, 16-a compensation cavity inlet, 17-a filling port and 18-a vapor pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, an embodiment of the present invention provides a dual-evaporator loop heat pipe, which includes a first evaporator 1, a second evaporator 2, a first vapor transmission pipeline 3, a second vapor transmission pipeline 4, a condenser 6, a mixer 8, and a liquid transmission pipeline 9, wherein: the first evaporator 1 and the second evaporator 2 are respectively connected with an inlet of a condenser 6 through a first steam transmission pipeline 3 and a second steam transmission pipeline 4, so that steam generated by the first evaporator 1 and the second evaporator 2 respectively enters the condenser 6 to be condensed, and mutual interference between the two evaporators is avoided, an outlet of the condenser 6 is respectively connected with the first evaporator 1 and the second evaporator 2 through a mixer 8 and a liquid transmission pipeline 9, and is used for mixing liquid generated by condensation in the mixer 8 and then respectively sending the mixed liquid into the first evaporator 1 and the second evaporator 2, so that a double-evaporator loop heat pipe is formed, and meanwhile, the condenser 6 is provided with a refrigerant inlet 7 and a refrigerant outlet 5 for introducing and discharging refrigerants.
Further, the first evaporator 1 and the second evaporator 2 are flat plate evaporators, and the structure of the flat plate evaporator is shown in fig. 2, a compensation cavity 15 is formed in a cavity between an upper shell plate 11 and a capillary wick 13 of the flat plate evaporator, a heating surface 12 is tightly attached to a wall of a device to be cooled, an inlet 16 of the compensation cavity is connected with a pipe bridge 10, an outlet 14 of the evaporator is connected with the first vapor transmission pipeline 3 or the second vapor transmission pipeline 4, during operation, condensed liquid enters from the inlet 16 of the compensation cavity, phase change evaporation occurs under the heat effect of the device to be cooled, generated vapor enters the condenser 6 along the capillary wick 13 and the outlet 14 of the evaporator, condenses in the condenser 6 and returns to the flat plate evaporator through the liquid transmission pipeline 9.
Further, the tail end of the liquid transmission pipeline 9 is connected with a pipe bridge 10 through a tee joint, and the pipe bridge 10 is a metal pipeline with a smooth inner wall or a metal pipeline with a built-in wire mesh; the mixer 8 is in the shape of a square cavity or a cylinder; the condenser 6 is used for releasing heat generated by the steam and condensing the heat into liquid, and may be a double-pipe condenser, a tube-fin condenser or a radiant plate condenser, and the first evaporator 1 and the second evaporator 2 may be coupled in one condenser 6, or may be coupled to one condenser respectively.
The heat dissipation effect of the double-evaporator loop heat pipe provided by the invention is verified through experiments.
Fig. 3 shows the operation condition of starting a single evaporator under a 100W thermal load of the dual-evaporator loop heat pipe provided by the embodiment of the present invention, and after the thermal load is loaded, the system can be started quickly and reach stable operation quickly.
FIG. 4 shows the operation condition of the dual-evaporator loop heat pipe provided by the embodiment of the present invention when two evaporators start up simultaneously under 10W-10W heat load, and the system can quickly enter a steady state similar to the starting condition of a single evaporator of 100W.
Fig. 5 and 6 show the operating conditions of the dual-evaporator loop heat pipe provided by the embodiment of the invention when two evaporators are started simultaneously under the thermal loads of 80W-80W and 130W-130W, and the system can quickly enter a stable state similar to the operating condition when a single evaporator is started under the thermal load of 100W.
FIG. 7 shows the operation condition of the dual-evaporator loop heat pipe provided by the embodiment of the present invention when two evaporators are started simultaneously under 30W-20W thermal loads, and the system can still rapidly enter a steady state under unequal thermal loads.
Fig. 8 shows the continuous operation condition of the dual-evaporator loop heat pipe under the thermal load, and under each thermal load in the experiment, the system can quickly respond to the thermal load change and quickly reach the stable operation state under the thermal load.
The invention provides a parallel-connection flat plate type double-evaporator loop heat pipe, as shown in figure 9, a first evaporator 1 and a second evaporator 2 are connected in a completely parallel connection mode, generated steam enters a steam pipeline 18 after passing through a corresponding steam branch and then enters a condenser 6 for condensation, generated liquid is distributed to each corresponding liquid branch through a liquid transmission pipeline 9, compensation cavities of the first evaporator 1 and the second evaporator 2 are transmitted back to supply liquid for a capillary core, and working media are filled through a filling opening 17.
FIG. 10 shows the working condition of the parallel double-evaporator loop heat pipe provided by the comparative example of the invention that two evaporators are started simultaneously under the heat load of 40W-40W, then the heat load of the second evaporator is removed, and the first evaporator continues to operate, and FIG. 11 shows the working condition of the parallel double-evaporator loop heat pipe provided by the comparative example of the invention that two evaporators are started simultaneously under the heat load of 40W-40W, then the heat load of the first evaporator is removed, and the second evaporator continues to operate. The test result shows that the parallel double-evaporator loop heat pipe provided by the invention hinders the normal circulation of the working medium due to the mutual interference of the steam from the two evaporators, so that the system can not reach a stable state when being started simultaneously, and can still not run stably after one evaporator is removed.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (7)
1. A double evaporator loop heat pipe, comprising a first evaporator (1), a second evaporator (2), a first vapor transmission line (3), a second vapor transmission line (4), a condenser (6), a mixer (8) and a liquid transmission line (9), wherein: the first evaporator (1) and the second evaporator (2) are respectively connected with an inlet of the condenser (6) through a first steam transmission pipeline (3) and a second steam transmission pipeline (4), so that steam generated by the first evaporator (1) and the second evaporator (2) respectively enters the condenser (6) to be condensed, and mutual interference between the two evaporators is avoided, and an outlet of the condenser (6) is respectively connected with the first evaporator (1) and the second evaporator (2) through the mixer (8) and the liquid transmission pipeline (9) and is used for mixing liquid generated by condensation in the mixer (8) and then respectively sending the mixed liquid into the first evaporator (1) and the second evaporator (2), so that the double-evaporator loop heat pipe is formed.
2. The dual evaporator loop heat pipe as claimed in claim 1, wherein the first evaporator (1) and the second evaporator (2) are flat plate evaporators.
3. Double evaporator loop heat pipe according to claim 1 or 2, wherein the compensation chamber inlets of the first evaporator (1) and the second evaporator (2) are connected by a pipe bridge (10).
4. The dual evaporator loop heat pipe of claim 1, wherein the pipe bridge (10) is a metal pipe with a smooth inner wall or a wire mesh built-in metal pipe.
5. A double evaporator loop heat pipe as defined in claim 1 wherein the mixer (8) is in the shape of a square chamber or a cylinder.
6. The dual evaporator loop heat pipe of claim 1, wherein the condenser (6) is a tube-in-tube condenser, a tube fin condenser or a radiant plate condenser.
7. The double evaporator loop heat pipe as recited in any one of claims 1 to 6, wherein the number of the condensers (6) is one or two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911381597.8A CN111006529A (en) | 2019-12-27 | 2019-12-27 | Double-evaporator loop heat pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911381597.8A CN111006529A (en) | 2019-12-27 | 2019-12-27 | Double-evaporator loop heat pipe |
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| Publication Number | Publication Date |
|---|---|
| CN111006529A true CN111006529A (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911381597.8A Pending CN111006529A (en) | 2019-12-27 | 2019-12-27 | Double-evaporator loop heat pipe |
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| CN (1) | CN111006529A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446888A (en) * | 2021-06-30 | 2021-09-28 | 华中科技大学 | Multi-evaporator flat-plate loop heat pipe system suitable for long-distance heat transmission |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1684043A2 (en) * | 2000-06-30 | 2006-07-26 | Swales Aerospace | Phase control in the capillary evaporators |
| CN1995895A (en) * | 2006-01-05 | 2007-07-11 | 捷飞有限公司 | Loop type heat exchanger |
| CN201104143Y (en) * | 2007-02-05 | 2008-08-20 | 中山大学 | Multicenter self-adjusting recirculation loop heat pipe device |
| CN102003901A (en) * | 2010-11-26 | 2011-04-06 | 中国科学院上海技术物理研究所 | Double-evaporator loop heat pipe |
| CN102997728A (en) * | 2013-01-05 | 2013-03-27 | 北京德能恒信科技有限公司 | Multistage separated heat pipe |
| CN107726904A (en) * | 2017-10-31 | 2018-02-23 | 华中科技大学 | A kind of Micropump secondary ring heat pipe for multi-heat source radiating |
-
2019
- 2019-12-27 CN CN201911381597.8A patent/CN111006529A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1684043A2 (en) * | 2000-06-30 | 2006-07-26 | Swales Aerospace | Phase control in the capillary evaporators |
| CN1995895A (en) * | 2006-01-05 | 2007-07-11 | 捷飞有限公司 | Loop type heat exchanger |
| CN201104143Y (en) * | 2007-02-05 | 2008-08-20 | 中山大学 | Multicenter self-adjusting recirculation loop heat pipe device |
| CN102003901A (en) * | 2010-11-26 | 2011-04-06 | 中国科学院上海技术物理研究所 | Double-evaporator loop heat pipe |
| CN102997728A (en) * | 2013-01-05 | 2013-03-27 | 北京德能恒信科技有限公司 | Multistage separated heat pipe |
| CN107726904A (en) * | 2017-10-31 | 2018-02-23 | 华中科技大学 | A kind of Micropump secondary ring heat pipe for multi-heat source radiating |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113446888A (en) * | 2021-06-30 | 2021-09-28 | 华中科技大学 | Multi-evaporator flat-plate loop heat pipe system suitable for long-distance heat transmission |
| CN113446888B (en) * | 2021-06-30 | 2022-05-20 | 华中科技大学 | Multi-evaporator flat-plate loop heat pipe system suitable for long-distance heat transfer |
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Application publication date: 20200414 |