CN110017714B - Low-temperature gravity heat pipe with carbon dioxide as working medium and filling method thereof - Google Patents
Low-temperature gravity heat pipe with carbon dioxide as working medium and filling method thereof Download PDFInfo
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- CN110017714B CN110017714B CN201910307312.XA CN201910307312A CN110017714B CN 110017714 B CN110017714 B CN 110017714B CN 201910307312 A CN201910307312 A CN 201910307312A CN 110017714 B CN110017714 B CN 110017714B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 125
- 238000011049 filling Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 55
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 47
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 47
- 230000005484 gravity Effects 0.000 title claims abstract description 21
- 238000009413 insulation Methods 0.000 claims abstract description 15
- 229920000742 Cotton Polymers 0.000 claims abstract description 11
- 235000011089 carbon dioxide Nutrition 0.000 claims description 27
- 238000000859 sublimation Methods 0.000 claims description 5
- 230000008022 sublimation Effects 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002787 reinforcement Effects 0.000 abstract description 4
- 239000002689 soil Substances 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000000746 purification Methods 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 11
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000005429 filling process Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Images
Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
A low-temperature gravity heat pipe using carbon dioxide as a working medium and a filling method thereof belong to the field of low-temperature gravity heat pipes and filling methods thereof. The low-temperature gravity heat pipe comprises a one-way needle valve, a pipe body, heat insulation cotton and a quick-mounting one-way valve male head; the two ends of the pipe body are respectively connected with a one-way needle valve and a quick-mounting one-way valve male head, and the outer wall of the pipe body is sleeved with heat insulation cotton; the filling method comprises the following steps: filling schemes of an emptying method and an evacuation method; in order to optimize the filling of the heat pipe, the emptying method is simple to operate and high in safety, and the obtained heat pipe has good performance; the heat pipe obtained by the evacuation method has extremely excellent performance and extremely small heat transfer temperature difference. The advantages are that: the gravity assisted heat pipe has the advantages of relatively simple structure, convenience in manufacturing, low cost, easiness in popularization, simplicity in operation, high safety and good performance; the carbon dioxide is easy to prepare, low in cost, stable in chemical property, free of flammability and explosiveness, free of corrosiveness, environment-friendly and easy to popularize; the method is widely applicable to the fields of low-temperature cold accumulation, gas separation, methane purification, plateau frozen soil foundation reinforcement and the like.
Description
Technical Field
The invention relates to a low-temperature gravity heat pipe and a filling method thereof, in particular to a low-temperature gravity heat pipe taking carbon dioxide as a working medium and a filling method thereof.
Background
In recent years, the development of low-temperature refrigeration technology has been rapidly advanced, and heat exchange at low temperature is required in the fields of low-temperature medical treatment (about-120 ℃ minimum), spacecraft thermal control (-15 ℃ to 50 ℃), space radiation heat dissipation (-50 ℃ to 600 ℃), infrared detector low-temperature refrigeration (-271.5 ℃ to-123.5 ℃) and the like. According to different working temperatures, refrigeration technologies can be divided into a common refrigeration technology (the ambient temperature is-153 ℃) and a cryogenic technology (below-153 ℃), and the enhanced heat exchange in the fields has important significance for energy conservation, environmental protection and equipment working effect.
The heat pipe is used as a heat exchange element working by working medium phase change, has good isothermal property and higher heat transfer efficiency, is widely applied in the fields of aerospace temperature control, electronic component heat dissipation and the like, and is also successfully applied in the low-temperature fields of plateau frozen soil foundation reinforcement and the like, but the heat pipe is not widely applied in the low-temperature field on the whole, and the reason is mainly limited by the following two factors: firstly, the filling process of the low-temperature heat pipe is not mature enough, and as the most important link in the manufacturing process of the heat pipe, filling is a process of filling working medium into a pipe body, but the common problems at present are that filling equipment is complex, or the vacuum degree and the purity of the working medium cannot meet the requirements, so that the filling effect is influenced, and even potential safety problems, such as high pressure and toxicity, exist; secondly, the lower limit of the temperature in the range of the normal cooling temperature is still not low enough, currently, the working media commonly used by the low-temperature heat pipe in the normal cooling area are ammonia and freon, but the boiling point of most freon refrigerants is about minus 30 ℃, the boiling point of ammonia is minus 33.5 ℃, and when the working temperature of the heat pipe of the two working media is lower than the temperature, the heat transfer performance is sharply reduced.
As for the working medium, the problems of low safety and low economical efficiency exist when more ammonia and Freon are used. Firstly, the two are high-pressure liquid in the filling process, and the pressure of the two is higher than the atmospheric pressure, so that the filling process is more complicated and leakage is easy to occur; secondly, the two working media are not environment-friendly working media, for example, ammonia gas has corrosivity, and when the concentration is higher, explosion is easy to occur, and Freon is easy to destroy the ozone layer; and thirdly, the working medium cost and the filling cost of the two working mediums are high.
In contrast, carbon dioxide has many advantages, and as an environment-friendly gas, the critical point of carbon dioxide is 31 ℃, and the triple point is lower, namely-56.6 ℃, so that the theoretical working temperature of the carbon dioxide heat pipe can be as low as-56.6 ℃. In addition, the carbon dioxide has high heat transfer performance and flow performance, the viscosity of the liquid carbon dioxide is 139.3 mu Pa.s at the temperature of minus 20 ℃, is lower than the viscosity of ammonia and freon, (the former is 309.0 mu Pa.s, and the latter is 214.4 mu Pa.s for R12), the thermal conductivity is 134.6 mW/m.K, and is higher than that of freon (the thermal conductivity is 83.1 mW/m.K) by one magnitude. Therefore, the heat pipe using carbon dioxide as working medium is expected to have better heat transfer performance.
At present, heat pipes using carbon dioxide as a working medium are frequently used at a temperature of above 0 ℃, for example, in the application of the heat dissipation field of a data center, the working temperature is 10-20 ℃, but the use cases below 0 ℃ are less seen, so the low-temperature heat transfer advantage is not played. In addition, the current carbon dioxide filling mode is directly filled in a liquid state, and the liquid carbon dioxide is high in pressure and easy to leak, so that the requirement on the sealing performance of filling equipment is high, the safety requirement of high-pressure equipment is high, and meanwhile, certain potential safety hazards can exist in low temperature generated in the carbon dioxide leakage process.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides a low-temperature gravity heat pipe which is simple in structure, convenient to operate and stable in performance and takes carbon dioxide as a working medium and a filling method thereof.
The technical scheme is as follows: the invention relates to a low-temperature gravity heat pipe with carbon dioxide as a working medium, which comprises a one-way needle valve, a pipe body filled with dry ice), heat insulation cotton and a quick-assembly one-way valve male head; one end of the pipe body is connected with the one-way needle valve, the other end of the pipe body is connected with the fast-assembly one-way valve male head, and the heat insulation cotton is sleeved on the outer wall of the pipe body; one-way needle valve and body fixed connection, the public head of fast-assembling check valve and body threaded connection, one-way needle valve include the valve body, establish the valve cap on the valve body and establish the case in the valve body.
The filling method of the low-temperature gravity heat pipe using the carbon dioxide as the working medium comprises an evacuation filling method and an evacuation filling method;
the emptying and filling method comprises the following steps: adding dry ice which can be sublimated when being heated into the tube body, wherein the density of carbon dioxide gas of the dry ice is greater than that of air, so that the carbon dioxide which is sublimated when being heated is gathered at the bottom of the tube body, and the air in the tube is gradually exhausted from the one-way needle valve;
the method for evacuating and filling comprises the following steps: the pipe filled with the dry ice is placed into a Dewar flask filled with a low-temperature bath solution, the temperature of the pipe is reduced, the vapor pressure of the dry ice in the pipe is reduced at low temperature, and therefore loss caused by sublimation of a large amount of carbon dioxide is avoided, and the heat pipe is pumped by a molecular pump.
The specific operation process of the emptying and filling method is as follows:
the heat pipe body is vertically placed, the fast-assembly one-way valve male head is opened, dry ice is added into the heat pipe body, the fast-assembly one-way valve male head is screwed down, the heat pipe body is inverted, the one-way needle valve faces upwards, the valve cap is opened, the valve core is ejected, the dry ice is heated and sublimated, the carbon dioxide is higher than the air, the carbon dioxide is gathered at the bottom, the air is discharged from the one-way needle valve gradually, then the valve core of the needle valve is reset, the valve cap is screwed down, and the filling of the heat.
The specific operation process of the evacuation filling method is as follows:
putting a heat pipe body into a Dewar flask storing a low-temperature bath solution with the temperature of-60 ℃, wherein the Dewar flask plays a role of heat preservation, opening a fast-assembly one-way valve male head, adding dry ice into the heat pipe body, screwing the fast-assembly one-way valve male head, tightly clamping the fast-assembly one-way valve male head and the fast-assembly one-way valve female head, connecting the fast-assembly one-way valve female head with a molecular pump through a suction pipe, opening the molecular pump to fast suck the heat pipe until the internal absolute pressure reaches 10 DEG C-1～101And Pa, disconnecting the male head of the fast-assembly one-way valve and the female head of the fast-assembly one-way valve to finish filling.
Has the advantages that: by adopting the scheme, the invention can fully exert the high-efficiency heat transfer performance of the heat pipe in low-temperature heat exchange, and has simple and easy manufacturing process and excellent performance. The gravity heat pipe has higher heat transfer performance in a larger temperature range below the freezing point, the structure form is a gravity heat pipe with a simpler structure, and the filling working medium is filled in a solid state form; because the carbon dioxide exists stably in a solid dry ice form under normal pressure, the heat pipe is filled in a solid form by utilizing the characteristic of the carbon dioxide, the filling is simple and convenient, and the filling is safer; the heat pipe uses carbon dioxide as a working medium, so that the heat pipe can normally work at the temperature of-55-0 ℃, the temperature difference is similar to that of a normal-temperature gravity heat pipe, and the carbon dioxide has the advantages of easiness in preparation, lower cost, stable chemical property, no flammability and explosiveness, no corrosiveness and good environmental friendliness. The filling method is simple to operate, high in safety and good in performance of the obtained heat pipe. The low-temperature bath can reduce the vapor pressure of dry ice in the tube, avoid the loss caused by sublimation of a large amount of working media, and utilize the molecular pump to suck the heat pipe, thereby obtaining extremely high vacuum degree. The heat pipe obtained by the method has extremely excellent performance and extremely small heat transfer temperature difference.
The invention is suitable for the enhanced heat transfer in the low-temperature environment of-55-0 ℃, such as: low-temperature cold accumulation, gas separation, methane purification, plateau frozen soil foundation reinforcement and the like. The main advantages are:
1. the invention uses carbon dioxide as working medium, can make the heat pipe work normally between-55 deg.C-0 deg.C, solve the problem of low heat transfer efficiency of working medium heat pipes such as ammonia, freon, etc. in low temperature environment; the working medium is easy to prepare, low in cost, stable in chemical property, free of flammability and explosiveness, free of corrosivity and good in environment friendliness;
2. the method for filling in the form of solid carbon dioxide (dry ice) is simple to operate and high in safety, reduces the requirements on equipment, and obtains the heat pipe with good performance;
3. the evacuation filling method provided by the invention can save the complicated processes such as vacuumizing and the like, can achieve better filling effect by utilizing dry ice sublimation, and the obtained heat pipe has extremely excellent performance and extremely small heat transfer temperature difference.
4. The air pumping filling scheme provided by the invention can obtain extremely high vacuum degree (the absolute pressure can reach 10 < -1 > to 10 >)1Pa), the high-efficiency heat transfer performance of the heat pipe is exerted to the maximum extent; can ensure the purity of the working medium and is convenient to operate.
5. The working thermal resistance is only about 0.3K/W in normal operation, the axial temperature difference is 3-8 ℃, and the axial temperature difference is equivalent to the temperature difference of a conventional heat pipe in normal operation, so that the aim of efficiently operating the heat pipe at low temperature is fulfilled.
6. Has extremely high heat transfer performance within the temperature range of-55 ℃ to 0 ℃, and is suitable for the fields of low-temperature cold accumulation, gas separation, methane purification, plateau frozen soil foundation reinforcement and the like.
7. The heat pipe of the invention uses non-welding technology (bolt connection), can change the conditions of working medium filling rate and the like under the condition of not replacing the pipe body, can be repeatedly used, is beneficial to saving materials and reducing the cost.
8. The invention has the advantages of relatively simple structure, convenient manufacture, low cost and benefit for popularization.
Drawings
FIG. 1 is a structural diagram of a gravity assisted heat pipe according to the present invention.
FIG. 2 is a schematic view of an evacuation-filling configuration of the present invention.
Fig. 3 is a schematic view of a filling structure of an evacuation method according to an embodiment of the present invention.
Fig. 4 is a partial enlarged structural view of I in fig. 3.
In the figure: 1-valve cap; 2-a valve core; 3-one-way needle valve; 4-a pipe body; 5-heat insulation cotton; 6-quick mounting of a one-way valve male head; 7-impact-resistant rubber plug; 8-Dewar flask; 9-low temperature bath solution; 10-vacuum meter; 11-a valve; 12-a suction tube; 13-quick-assembly check valve female head; 14-fast-assembly one-way valve female valve core; 15-quick-assembly one-way valve female head spring; 16-a sliding sleeve; 17-dry ice; 18-air; 19-a molecular pump; 20-quick-assembly one-way valve male valve core; 21-quick-assembly check valve male spring.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
the invention relates to a low-temperature gravity heat pipe with carbon dioxide as a working medium, which mainly comprises a one-way needle valve 3, a pipe body 4 filled with dry ice 17, heat insulation cotton 5 and a quick-assembly one-way valve male head 6; the one-way needle valve 3 and the quick-assembly one-way valve male head 6 are both one-way flow components, and fluid can only flow in along an inlet and cannot flow out; one end of the pipe body 4 is connected with the one-way needle valve 3, the other end of the pipe body is connected with the quick-assembly one-way valve male head 6, and the heat insulation cotton 5 is sleeved on the outer wall of the pipe body 4; one-way needle valve 3 and 4 welded fastening of body are connected, the public head of fast-assembling check valve 6 and 4 threaded connection of body, one-way needle valve 3 include the valve body, establish valve cap 1 on the valve body and establish case 2 in the valve body, the air in the exhaust pipe of being convenient for of one-way needle valve 3, the public head of check valve 6 is easily dismantled. The heat pipe body 4 is made of copper material, and copper has good heat conductivity and enough strength and can meet the working conditions of high pressure and low temperature in the heat pipe; the heat insulation cotton 5 can reduce the heat dissipation of the non-working area (heat insulation section) of the heat pipe, and the heat pipe is sleeved on the outer wall of the pipe body 4, so that the work efficiency is improved.
The filling method of the low-temperature gravity heat pipe using the carbon dioxide as the working medium comprises two methods, namely an emptying filling method and an evacuating filling method; in order to optimize the filling of the heat pipe, the emptying method is simple to operate, high in safety and good in performance; the heat pipe obtained by the evacuation method has extremely excellent performance and extremely small heat transfer temperature difference
The emptying and filling method comprises the following steps: adding dry ice 17 which can be sublimated when heated into the tube body 4, wherein the density of carbon dioxide gas of the dry ice is greater than that of air, so that the carbon dioxide which is sublimated when heated is gathered at the bottom of the tube body 4, and the air in the tube is gradually exhausted from the one-way needle valve 3;
the method for evacuating and filling comprises the following steps: the pipe body 4 filled with the dry ice 17 is placed into a Dewar flask 8 filled with a low-temperature bath solution 9, the temperature of the pipe body 4 is reduced, the vapor pressure of the dry ice 17 in the pipe is reduced at low temperature, so that the loss of a large amount of carbon dioxide due to sublimation is avoided, and the heat pipe is pumped by using a molecular pump 19.
The specific operation process of the emptying and filling method is as follows:
as shown in fig. 2, the heat pipe body 4 is vertically placed, the fast-assembly check valve male head 6 is opened, dry ice 17 is added into the heat pipe body 4, the fast-assembly check valve male head 6 is screwed down, the heat pipe body 4 is inverted, the check needle valve 3 faces upwards, the valve cap 1 is opened, the valve core 2 is pushed open, the dry ice 17 is heated and sublimated, the carbon dioxide density is greater than that of air, the sublimated carbon dioxide is gathered at the bottom, the air 18 is gradually exhausted from the check needle valve 3, the check needle valve core 2 is reset, the valve cap 1 is screwed down, and the heat pipe is filled.
The specific operation process of the evacuation filling method is as follows:
as shown in fig. 3, the heat pipe body 4 is placed into a Dewar flask 8 in which a low-temperature bath solution 9 with the temperature of-60 ℃ is stored, the Dewar flask 8 plays a role of heat preservation, the male head 6 of the fast-assembly one-way valve is opened, dry ice is added into the heat pipe body 4, the male head 6 of the fast-assembly one-way valve is screwed, the male head 6 of the fast-assembly one-way valve and the female head 13 of the fast-assembly one-way valve are tightly clamped, the female head 13 of the fast-assembly one-way valve is connected with a molecular pump 19 through a suction pipe 12, the molecular pump 19 is opened to rapidly suck the heat-1～101And Pa, then disconnecting the male head 6 of the fast-assembly one-way valve and the female head 13 of the fast-assembly one-way valve, and finishing filling. The upper part (condensation section) of the filled heat pipe is arranged in a region with lower temperature of-55-0 ℃ below the heat pipeThe part (evaporation section) is arranged in a region with a temperature higher than that of the condensation section, and an intermediate pipe body (heat insulation section) which does not participate in heat exchange is subjected to heat insulation measures by heat insulation cotton so as to reduce heat exchange of heat in a non-working area; the evaporation section absorbs the ambient heat to vaporize the carbon dioxide in the heat pipe and flow the carbon dioxide to the condensation section, the condensation section radiates heat to the environment to liquefy the carbon dioxide in the heat pipe, and the liquefied carbon dioxide flows to the evaporation section along the wall surface under the action of gravity to complete circulation;
FIG. 4 is an enlarged view of I of FIG. 3 showing in detail the mating relationship of male quick-fit check valve 6 and female quick-fit check valve 13. The male head 6 of the fast-assembling one-way valve is in threaded connection with the pipe body 4, and the female head 13 of the fast-assembling one-way valve is in threaded connection with the suction pipe 12. When the male quick-assembly check valve 6 and the female quick-assembly check valve 13 are in a disengaged state, the valve core 20 of the male quick-assembly check valve 6 and the valve core 14 of the female quick-assembly check valve 13 are both in a closed state under the action of the respective spring 21 and spring 15; the sliding sleeve 16 is slid, the fast-assembling one-way valve male head 6 and the fast-assembling one-way valve thread head 3 are located at the matching position, the fast-assembling one-way valve male head valve core 20 and the fast-assembling one-way valve female head valve core 14 are abutted against each other and opened by overcoming the spring force, at the moment, the pipe body 4 is communicated with the suction pipe 12, the sliding sleeve 16 is loosened, and then the fast-assembling one-way valve male head 6 and the fast-assembling one-way valve female head 13 are clamped.
Claims (3)
1. A filling method of a low-temperature gravity heat pipe with carbon dioxide as a working medium is characterized by comprising the following steps: the filling method comprises an evacuation filling method and an evacuation filling method;
the emptying and filling method comprises the following steps: dry ice (17) which can be sublimated when being heated is added into the tube body (4), and because the density of carbon dioxide gas of the dry ice is greater than that of air, the carbon dioxide which is sublimated when being heated is gathered at the bottom of the tube body (4), and the air in the tube is gradually exhausted from the one-way needle valve (3);
the method for evacuating and filling comprises the following steps: putting the pipe body (4) filled with the dry ice (17) into a Dewar flask (8) filled with a low-temperature bath solution (9), reducing the temperature of the pipe body (4), and reducing the vapor pressure of the dry ice (17) in the pipe at a low temperature, thereby avoiding the loss of a large amount of carbon dioxide due to sublimation, and pumping the heat pipe by using a molecular pump (19);
the specific operation process of the emptying and filling method is as follows:
with vertical the placing of heat pipe body (4), open public head of fast-assembling check valve (6), add dry ice (17) in to heat pipe body (4), screw up public head of fast-assembling check valve (6), invert heat pipe body (4), make one-way needle valve (3) up, open valve cap (1), back open case (2), dry ice (17) are heated and sublimate, because of carbon dioxide density is greater than the air, will be in the bottom gathering, and discharge air (18) from one-way needle valve (3) gradually, afterwards, needle valve case (2) reset, screw up valve cap (1), accomplish the filling of heat pipe.
2. The filling method of the low-temperature gravity heat pipe with carbon dioxide as the working medium according to claim 1, comprising the following steps: the method is characterized in that: the specific operation process of the evacuation filling method is as follows:
putting a heat pipe body (4) into a Dewar flask (8) in which a low-temperature bath solution (9) with the temperature of-60 ℃ is stored, wherein the Dewar flask (8) plays a role in heat preservation, opening a fast-assembly one-way valve male head (6), adding dry ice into the heat pipe body (4), screwing the fast-assembly one-way valve male head (6), tightly clamping the fast-assembly one-way valve male head (6) and a fast-assembly one-way valve female head (13), connecting the fast-assembly one-way valve female head (13) with a molecular pump (19) through a suction pipe (12), and opening the molecular pump (19) to rapidly suck the heat pipe until the internal absolute pressure reaches 10 DEG C-1～101And (Pa), disconnecting the male head (6) of the quick-assembly check valve and the female head (13) of the quick-assembly check valve to finish filling.
3. The filling method of claim 1, wherein the low-temperature gravity assisted heat pipe using carbon dioxide as a working medium is characterized in that: the quick-assembly type thermal insulation valve comprises a one-way needle valve (3), a pipe body (4) filled with dry ice (17), thermal insulation cotton (5) and a quick-assembly one-way valve male head (6); one end of the pipe body (4) is connected with the one-way needle valve (3), the other end of the pipe body is connected with the quick-assembly one-way valve male head (6), and the heat insulation cotton (5) is sleeved on the outer wall of the pipe body (4); one-way needle valve (3) and body (4) fixed connection, public head (6) of fast-assembling check valve and body (4) threaded connection, one-way needle valve (3) include the valve body, establish valve cap (1) on the valve body and establish case (2) in the valve body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910307312.XA CN110017714B (en) | 2019-04-17 | 2019-04-17 | Low-temperature gravity heat pipe with carbon dioxide as working medium and filling method thereof |
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| CN201910307312.XA CN110017714B (en) | 2019-04-17 | 2019-04-17 | Low-temperature gravity heat pipe with carbon dioxide as working medium and filling method thereof |
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| CN110017714B true CN110017714B (en) | 2020-01-24 |
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| JPH0678873B2 (en) * | 1985-10-14 | 1994-10-05 | 株式会社フジクラ | Heat pipe manufacturing method |
| CN101033923B (en) * | 2006-12-21 | 2010-08-25 | 胡凯 | Non-hyperthermia heat pipe structure |
| EP3193571B1 (en) * | 2015-10-23 | 2020-08-26 | Huawei Technologies Co., Ltd. | Heat pipe based cooling system and power equipment |
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