CN1651844A - Gravity assisted low temp loop heat pipe for deep low temp area - Google Patents
Gravity assisted low temp loop heat pipe for deep low temp area Download PDFInfo
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- CN1651844A CN1651844A CN 200510002107 CN200510002107A CN1651844A CN 1651844 A CN1651844 A CN 1651844A CN 200510002107 CN200510002107 CN 200510002107 CN 200510002107 A CN200510002107 A CN 200510002107A CN 1651844 A CN1651844 A CN 1651844A
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- heat pipe
- loop heat
- pipe
- gravity assisted
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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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The present invention relates to a gravity auxiliary low-temperature loop heat pipe in deep low-temperature zone. It includes the following main components: evaporator, condenser and gas chamber. Said invention also provides the concrete structure of the above-mentioned every component, and provides the mounting mode of them. Said invention adopts the deep low-temperature working medium of nitroegn gas, etc, as working liquid, it can be worked in the liquid introgen temperature zone, and lower deep low-temperature zone, at the same time it utilizes phase change heat transfer, and works under the gravity auxiliary condition, so that it has good isothermal property, and can implement far-distance small temperature difference heat transfer.
Description
Technical field
The invention belongs to refrigeration and cryogenic technique field, particularly liquid nitrogen temperature and even more auxiliary a kind of simple in structure, the gravity assisted cryogenic loop heat pipe at a distance efficiently down of the gravity of low-temperature space.
Background technology
21 century is the century of cryogenic refrigeration machine technology and superconductor technology great development, and the application of Refrigeration Technique will more extensively be goed deep into.At present, the low-temperature receiver of high-temperature superconductive device mainly is the micro low-temperature refrigeration machine.Current, the common method that connects the refrigeration machine and the device that is cooled is to carry out the heat conduction with copper rod, and its shortcoming is when hot transmission range is elongated, and the two ends temperature difference can be subjected to the restriction of heat conduction cross-sectional area.In order under the same temperature difference, to transmit more heat, just need to seek other heat-transferring method.As everyone knows, a kind of so just effective heat-transfer equipment of heat pipe is the principle of phase-change heat transfer because its utilizes, so can transmit more heat under the less temperature difference.Though the structure of conventional heat pipe is comparatively simple, it also is not suitable for remote heat transmission, can not avoid Cryo Refrigerator to the mechanical oscillation of device generation and the influence of electromagnetic interference of being cooled.
The difference of loop heat pipe and conventional heat pipe is: the stainless steel tube of the inner wall smooth that use is flexible or metal hose are as transfer line, thereby reduced working medium pressure drop of flow in transfer line, thereby make this equipment can grow distance, a large amount of heats of little temperature difference ground transmission, make the layout of the Cryo Refrigerator and the device that is cooled become quite flexible simultaneously.In addition, because the superconducting transition temperature still lower (generally being in liquid nitrogen temperature or lower) of current superconductive device that can practicability, and be that the normal temperature loop heat pipe of working medium can not be applied to the extremely low occasion of this temperature with ammonia (freezing point 195K), therefore need the development cryogenic loop heat pipe satisfy this demand.
Summary of the invention
The objective of the invention is to: in order to improve Cryo Refrigerator and the integrated relationship between device of being cooled, and provide a kind of gravity assisted cryogenic loop heat pipe that is operated in profound hypothermia district (liquid nitrogen temperature and following warm area thereof).It is a kind of efficient heat transfer equipment, and can solve refrigeration machine effectively and the isolation technics between device of being cooled, thereby effectively suppresses mechanical oscillation and electromagnetic interference from refrigeration machine.While so have good isothermal, so just can solve the problem that makes the reduction of refrigeration machine efficient greatly owing to the temperature difference between Cooling and Heat Source owing to the cryogenic loop heat pipe utilization also is the principle of phase-change heat transfer.Gravity assisted cryogenic loop heat pipe provided by the invention is simple in structure, can be applied to the occasion of the remote heat transmission in profound hypothermia district.
Technical scheme of the present invention is as follows:
The gravity assisted cryogenic loop heat pipe in profound hypothermia provided by the invention district comprises:
One evaporimeter 1 and connect with evaporimeter 1 by liquid line 2, and pass through a condenser 11 in steam pipe line 6 formation loops; Described condenser 11 is made up of a copper plate 4 and the soldering two sections copper tubes 3,31 on it; Described evaporimeter 1 is characterized in that for being cut with the stainless steel tube of axial slot on the bore area, also comprises: be installed on the condensate line of condenser 11 near the air reservoir 5 on the side pipe line of steam pipe line.
Described connection liquid line 2 and steam pipe line 8 are the flexible metal flexible pipe.Described connection liquid line 2 and steam pipe line 8 are flexible stainless-steel thin-wall pipe.Described evaporimeter 1 and liquid line 2 horizontal positioned.The position of described steam pipe line 6 is higher than the position of liquid line 2.The cup-shaped loose structure pipe 10 that coaxial placement is formed by the powder of stainless steel sintering in the endoporus of described evaporimeter 1.
Gravity assisted cryogenic loop heat pipe of the present invention utilizes the evaporation of working medium and the phase transition process that condenses transmits heat, thereby is a kind of heat-transfer equipment efficiently, can work under liquid nitrogen temperature and even lower profound hypothermia district.Its loop comprises an evaporimeter (device directly contacts with being cooled) that absorbs the low temperature thermic load, also has one heat discharged condenser (directly contacting with the refrigeration machine cold junction) to the refrigeration machine cold junction.Evaporimeter and condenser are that the length thin tube (as stainless steel tube or metal hose) by flexibility links to each other, for the Cryo Refrigerator cold junction and heat and the vibration that provides good between device that be cooled isolate, and make that the layout of cold and heat source is more flexible.In addition,, adopt profound hypothermia working medium such as nitrogen, need therefore to consider that whole system under the normal temperature has the safety problem of enough bearing capacities as working fluid because gravity assisted cryogenic loop heat pipe is operated in the profound hypothermia district.Therefore, in order to ensure the safety under the normal temperature, just the air reservoir of a big volume of needs use reduces the pressure under the normal temperature.Though normal temperature working medium such as cryogenic fluid such as nitrogen and ammonia are compared, its surface tension is little, flow resistance is big, and is down auxiliary at gravity, and gravity assisted cryogenic loop heat pipe provided by the invention still has remotely transferring performance preferably.
Gravity assisted cryogenic loop heat pipe of the present invention, condenser 11 are to be formed on a copper sheet by two sections copper tube solderings.Evaporimeter 1 is the stainless steel tube that is cut with axial slot on the bore area, because gravity assisted cryogenic loop heat pipe provided by the invention lays particular emphasis on application in the gravitational field, thereby the cup-shaped loose structure pipe that can coaxial placement in the endoporus of evaporimeter 1 forms by the powder of stainless steel sintering (also not placing porous structural tube).When evaporator temperature drops to operating temperature, but with regard to heating fumigators, so the liquid refrigerant in the loose structure will be subjected to thermal evaporation, and form the gas-liquid interface, the pressure differential of these gas-liquid interface both sides is capillary pressure.Under the driving of this pressure reduction and gravity, the steam that produces in the evaporimeter 1 will flow to condenser 11 by steam pipe line, promote condensed condensate liquid simultaneously and flow back to the evaporimeter 1 from liquid line.So constantly circulation can be passed to condenser 11 to heat from evaporimeter 1.When in the evaporimeter 1 not during the placing porous structure, drive working medium and just have only gravity along the power of Modelling of Flow with Recirculation.What connect evaporimeter 1 and condenser 11 is liquid line and vapor line, use all be the flexible stainless-steel thin-wall pipe of external diameter less (as 3mm).In addition, air reservoir 5 links to each other by an elongated tubular with whole loop.
Gravity assisted cryogenic loop heat pipe of the present invention mainly is devoted to the remote cold transmission of Cryo Refrigerator in the gravitational field, and can improve Cryo Refrigerator effectively and the integrated relationship between device of being cooled, avoid mechanical oscillation and electromagnetic interference from Cryo Refrigerator.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention;
Fig. 2 is the structural representation of evaporimeter 1;
Fig. 3 is the A-A generalized section of Fig. 2.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is an overall structure schematic diagram of the present invention; Fig. 2 is the structural representation of evaporimeter 1; As seen from the figure, the gravity assisted cryogenic loop heat pipe in profound hypothermia of the present invention district, an evaporimeter 1 and connect with evaporimeter 1 by liquid line 2, and pass through a condenser 11 in steam pipe line 6 formation loops; Described condenser 11 is made up of a copper plate 4 and the soldering two sections copper tubes 3,31 on it; As shown in Figure 2, described evaporimeter 1 is for being cut with the stainless steel tube of axial slot, the cup-shaped loose structure pipe 10 that coaxial placement is formed by the powder of stainless steel sintering in its endoporus on the bore area; And, be installed on the condensate line of condenser 11 near the air reservoir 5 on the side pipe line of steam pipe line.
Described connection liquid line 2 and steam pipe line 8 are the flexible metal flexible pipe.Described connection liquid line 2 and steam pipe line 8 are flexible stainless-steel thin-wall pipe.Described evaporimeter 1 and liquid line 2 horizontal positioned.The position of described steam pipe line 6 is higher than the position of liquid line 2.
The gravity assisted cryogenic loop heat pipe in profound hypothermia of the present invention district, its evaporimeter 1 is the stainless steel tube that inner surface has cut axial slot, coaxial placement is the cup-shaped loose structure pipe that is formed by the powder of stainless steel sintering in its endoporus.What connect evaporimeter 1 and condenser pipeline 3 is liquid line 2 and vapor line 6, use all be the flexible stainless-steel thin-wall pipe of external diameter less (as 3mm).Air reservoir 5 links to each other with whole loop by an elongated tubular 7.
If adopt high purity nitrogen as hydraulic fluid, gravity assisted cryogenic loop heat pipe then provided by the invention can be operated in liquid nitrogen temperature, only needs to use Cryo Refrigerator that condenser cold drawing 4 is cooled to and maintains 78K in the case and gets final product.As shown in Figure 1, gravity assisted cryogenic loop heat pipe horizontal positioned and integral body are in (as room temperature 273K) under the environment temperature during beginning.The relative position of adjusting liquid line 2 and steam pipe line 6 can make steam pipe line 6 be higher than liquid line 2, but evaporimeter 1 and liquid line 2 still are horizontal.Like this, gravity assisted cryogenic loop heat pipe provided by the invention can be operated under the gravity subsidiary conditions.After using Cryo Refrigerator that condenser cold drawing 4 is cooled to 78K, owing to condenser pipeline 3 directly contacts with cold drawing 4, so the working medium in the condenser pipeline 3 is liquefied by the effect of heat conduction.Simultaneously, condensate liquid will flow to evaporimeter 1 under the effect of gravity, and make evaporimeter 1 cooling.
Reduce to below the critical-temperature of working medium when evaporimeter 1 temperature after, gravity assisted cryogenic loop heat pipe just can enter normal operating conditions.At this moment, evaporimeter 1 is with the be cooled caloric value of device of absorption, and the liquid refrigerant in it will be subjected to thermal evaporation and produce certain capillary force.Under the acting in conjunction of capillary force and gravity, the steam that produces in the evaporimeter 1 will flow to condenser pipeline 3 by steam pipe line 6.Simultaneously, the partial condensation liquid in the condenser pipeline 3 also can flow back under capillary force and weight-driven in the evaporimeter 1, and circulation so constantly relies on latent heat that heat is passed to condenser cold drawing 4 from evaporimeter 1.
Claims (6)
1, the gravity assisted cryogenic loop heat pipe in a kind of profound hypothermia district comprises:
One evaporimeter (1) and connect with evaporimeter (1) and pass through the condenser (11) in steam pipe line (6) formation loop by liquid line (2); Described condenser (11) is made up of a copper plate (4) and the soldering two sections copper tubes (3,31) on it; Described evaporimeter (1) is characterized in that for being cut with the stainless steel tube of axial slot on the bore area, also comprises: be installed on the condensate line of condenser (11) near the air reservoir (5) on the side pipe line of steam pipe line.
2, the gravity assisted cryogenic loop heat pipe in profound hypothermia according to claim 1 district, it is characterized in that: described connection liquid line (2) and steam pipe line (8) are the flexible metal flexible pipe.
3, the gravity assisted cryogenic loop heat pipe in profound hypothermia according to claim 2 district, it is characterized in that: described connection liquid line (2) and steam pipe line (8) are flexible stainless-steel thin-wall pipe.
4, the gravity assisted cryogenic loop heat pipe in profound hypothermia according to claim 1 district is characterized in that: described evaporimeter (1) and liquid line (2) horizontal positioned.
5, the gravity assisted cryogenic loop heat pipe in profound hypothermia according to claim 1 district, it is characterized in that: the position of described steam pipe line (6) is higher than the position of liquid line (2).
6, the gravity assisted cryogenic loop heat pipe in profound hypothermia according to claim 1 district is characterized in that: the cup-shaped loose structure pipe (10) that coaxial placement is formed by the powder of stainless steel sintering in the endoporus of described evaporimeter (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100021070A CN100344930C (en) | 2005-01-13 | 2005-01-13 | Gravity assisted low temp loop heat pipe for deep low temp area |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100021070A CN100344930C (en) | 2005-01-13 | 2005-01-13 | Gravity assisted low temp loop heat pipe for deep low temp area |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1651844A true CN1651844A (en) | 2005-08-10 |
| CN100344930C CN100344930C (en) | 2007-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100021070A Active CN100344930C (en) | 2005-01-13 | 2005-01-13 | Gravity assisted low temp loop heat pipe for deep low temp area |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922880A (en) * | 2010-09-07 | 2010-12-22 | 万建红 | Separated flexible normal pressure heat pipe exchanger |
| CN102109258A (en) * | 2010-08-05 | 2011-06-29 | 中国科学院理化技术研究所 | Cryogenic loop heat pipe device |
| CN102121803A (en) * | 2011-03-16 | 2011-07-13 | 中国科学院上海技术物理研究所 | Double-evaporator loop heat pipe in medium and low temperature region |
| CN104535606B (en) * | 2014-12-02 | 2017-07-07 | 北京空间飞行器总体设计部 | Weight-driven two-phase fluid loop compatibility test method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109257A (en) * | 2010-08-05 | 2011-06-29 | 中国科学院理化技术研究所 | Low-temperature loop heat pipe device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6227288B1 (en) * | 2000-05-01 | 2001-05-08 | The United States Of America As Represented By The Secretary Of The Air Force | Multifunctional capillary system for loop heat pipe statement of government interest |
| US8136580B2 (en) * | 2000-06-30 | 2012-03-20 | Alliant Techsystems Inc. | Evaporator for a heat transfer system |
| WO2003054469A1 (en) * | 2001-12-21 | 2003-07-03 | Tth Research, Inc. | Loop heat pipe |
| JP2003194485A (en) * | 2001-12-27 | 2003-07-09 | Mitsubishi Electric Corp | Evaporator, loop heat pipe with built-in reservoir, and heat transport method |
| CN1295474C (en) * | 2003-12-15 | 2007-01-17 | 浙江大学 | High efficiency low temperature heat transfer element based on natural circulation precooling process |
| CN2788114Y (en) * | 2005-01-18 | 2006-06-14 | 中国科学院理化技术研究所 | Gravity aided cryogenic loop heat pipe for deep cryogenic region |
-
2005
- 2005-01-13 CN CNB2005100021070A patent/CN100344930C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109258A (en) * | 2010-08-05 | 2011-06-29 | 中国科学院理化技术研究所 | Cryogenic loop heat pipe device |
| CN102109258B (en) * | 2010-08-05 | 2013-03-13 | 中国科学院理化技术研究所 | Cryogenic loop heat pipe device |
| CN101922880A (en) * | 2010-09-07 | 2010-12-22 | 万建红 | Separated flexible normal pressure heat pipe exchanger |
| CN102121803A (en) * | 2011-03-16 | 2011-07-13 | 中国科学院上海技术物理研究所 | Double-evaporator loop heat pipe in medium and low temperature region |
| CN102121803B (en) * | 2011-03-16 | 2012-06-27 | 中国科学院上海技术物理研究所 | Double-evaporator loop heat pipe in medium and low temperature region |
| CN104535606B (en) * | 2014-12-02 | 2017-07-07 | 北京空间飞行器总体设计部 | Weight-driven two-phase fluid loop compatibility test method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100344930C (en) | 2007-10-24 |
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