CN110260695B - Large-angle approximately-horizontal heat pipe with evaporation section and construction method thereof - Google Patents
Large-angle approximately-horizontal heat pipe with evaporation section and construction method thereof Download PDFInfo
- Publication number
- CN110260695B CN110260695B CN201910610500.XA CN201910610500A CN110260695B CN 110260695 B CN110260695 B CN 110260695B CN 201910610500 A CN201910610500 A CN 201910610500A CN 110260695 B CN110260695 B CN 110260695B
- Authority
- CN
- China
- Prior art keywords
- working medium
- heat pipe
- section
- pipe
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001704 evaporation Methods 0.000 title claims abstract description 88
- 230000008020 evaporation Effects 0.000 title claims abstract description 75
- 238000010276 construction Methods 0.000 title claims abstract description 13
- 238000010992 reflux Methods 0.000 claims abstract description 54
- 238000005192 partition Methods 0.000 claims abstract description 35
- 239000007788 liquid Substances 0.000 claims description 103
- 238000005553 drilling Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 abstract description 20
- 238000009833 condensation Methods 0.000 abstract description 18
- 230000005494 condensation Effects 0.000 abstract description 18
- 230000005484 gravity Effects 0.000 abstract description 15
- 239000002689 soil Substances 0.000 abstract description 9
- 201000010099 disease Diseases 0.000 abstract description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 15
- 239000011162 core material Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000007710 freezing Methods 0.000 description 6
- 230000008014 freezing Effects 0.000 description 6
- 238000010257 thawing Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 208000037921 secondary disease Diseases 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 230000005068 transpiration Effects 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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
- F28D15/0266—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 separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
Landscapes
- 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)
- Road Paving Structures (AREA)
Abstract
The invention relates to a large-angle approximately horizontal heat pipe of an evaporation section and a construction method thereof, wherein the heat pipe comprises a condensation section and an evaporation section, the included angle between the condensation section and the evaporation section is 90-135 degrees, and the heat pipe specifically comprises a pipe wall (1), a baffle plate (5) and working media; a plurality of semi-open compartments are formed in the axial direction of the whole evaporation section by a plurality of partition boards, so that the problems of limited cooling range and vapor lock phenomenon of the evaporation section in the prior art are effectively solved. The heat pipe further comprises a working medium reflux conduit (3) and a working medium collector (4), wherein the working medium reflux conduit is arranged on the partition board, and a plurality of drip holes are arranged at the bottom of the working medium reflux conduit at intervals, so that the problem that the working medium in the evaporation section is difficult to reflux in the prior art is effectively solved. The application of the invention can solve the problem of long-distance and near-horizontal angle working medium backflow of the gravity type heat pipe in road engineering application, and solve the problem of prominent heat pipe roadbed secondary engineering diseases and the problem of frozen soil expressway construction.
Description
Technical Field
The invention relates to the technical field of heat pipes in permafrost areas, in particular to a large-angle approximately-horizontal heat pipe with an evaporation section and a construction method thereof.
Background
The heat pipe (also called a heat rod) is a high-efficiency heat conduction device formed by utilizing the heat conduction principle and the rapid heat transfer property of a refrigerating medium, and the technology has been widely applied to cold region engineering at home and abroad since the invention of G.M. Grover of national laboratory of Losalomos in the United states in 1963. The main working principle of the heat pipe is as follows: the liquid working medium in the pipe is heated and evaporated in the evaporation section to absorb heat, the evaporated vapor working medium passes through the heat insulation section and then releases heat when meeting condensation in the condensation section, and then the liquid working medium flows back to the evaporation section under the action of gravity. The circulation process continuously brings the heat of the evaporation section to the condensation section, so that the temperature of the frozen soil is reduced, and the frozen soil is protected.
At present, a heat pipe used in frozen soil engineering is mainly a linear gravity heat pipe with an evaporation section and a condensation section on the same straight line, and a small amount of heat pipes are L-shaped gravity heat pipes with the included angle of the reverse extension lines of the evaporation section and the condensation section being less than or equal to 45 degrees; the liquid working medium in the condensing section of the gravity heat pipe flows back to the evaporating section under the action of self gravity under the working state. Meanwhile, from the cooling effect range, the heat pipes belong to pure point cooling measures, cannot adapt to road engineering with linear and planar cooling requirements, and are easy to cause severe change and fluctuation of a ground temperature contour line, particularly severe fluctuation of a freezing and thawing interface in a warm season, and a large number of secondary engineering diseases such as longitudinal crack of a roadbed are induced. Particularly, under the condition of a frozen soil highway, the heat absorption intensity of the road surface is larger, the heat accumulation of the lower part and the center of the road surface is stronger, and the problem of secondary diseases is more prominent. In addition, the inner pipe walls of the evaporation sections of the heat pipes are smooth, and the liquid working medium is all positioned at the bottom of the heat pipes under the action of gravity, namely, the liquid working medium only occupies the part of the evaporation sections, which is at the back, so that the cooling range is severely limited.
Aiming at the defects of the pure point type cooling measures, the inventor proposes a coping concept of laying an evaporation section nearly horizontally, but when the evaporation section is laid nearly horizontally, the problem that liquid working medium in a condensation section is difficult to flow back exists. The solution in the prior art mainly utilizes the capillary action of the liquid suction core, and the liquid suction core can not transfer and reflux working medium through capillary adsorption action for the distance of which the length reaches above the meter level because the capillary action range is extremely limited and is mainly used in small-sized and non-gravity heat pipes, and the length is generally only a few centimeters to tens centimeters. Moreover, because the reflux speed of the working medium is very slow, under the condition of long reflux distance, the conflict and blockage caused by the opposite movement directions of the vapor working medium and the liquid working medium are also easy to be caused, namely the generation of the vapor lock phenomenon.
It can be seen that the heat pipe in the prior art has the problems of limited cooling range of the evaporation section, difficult backflow of working medium and vapor lock phenomenon in a near-horizontal long-distance state, and the problems can affect the cooling efficiency and the application effect of the heat pipe, so that a novel heat pipe capable of solving the problems is needed.
Disclosure of Invention
The invention aims to solve the technical problem of providing a large-angle approximately horizontal heat pipe of an evaporation section and a construction method thereof, so as to solve the problems of limited cooling range and vapor lock phenomenon of the evaporation section in the prior art.
In order to solve the problems, the large-angle approximately horizontal heat pipe with the evaporation section is characterized in that an included angle between the condensation section and the evaporation section of the heat pipe is 90-135 degrees, and the heat pipe specifically comprises a pipe wall, a partition plate and a working medium, wherein the partition plate and the working medium are arranged inside the pipe wall; the partition boards are arranged on the inner wall of the pipe at the bottom of the evaporation section at intervals so as to form a plurality of semi-open compartments in the axial direction of the whole evaporation section; the height of the partition plate is 1/5-2/3 of the diameter of the inner wall of the heat pipe.
Preferably, the heat pipe further comprises a working medium reflux conduit and a working medium collector which are arranged in the pipe wall; the working medium reflux guide pipe is provided with front and rear openings, is arranged on the partition plate and is at a certain height from the inner wall of the bottom pipe, and a plurality of liquid dropping holes are arranged at the bottom of the working medium reflux guide pipe at intervals; each compartment corresponds to a drop hole; the liquid inlet end of the working medium collector is arranged on the inner wall of the heat pipe, the liquid outlet end of the working medium collector is connected with the liquid inlet end of the working medium reflux conduit, and the working medium collector is used for intercepting and collecting liquid working medium flowing down along the inner wall of the heat pipe and outputting the liquid working medium to the working medium reflux conduit.
Preferably, the heat pipe further comprises a liquid suction core arranged below the working medium return conduit in the compartment; the working medium return conduit is supported by the wick or by the partition plate.
Preferably, the working medium collector is in a conical frustum structure with an opening along the axial direction, the large-caliber end is a liquid inlet end, the radius of the working medium collector is adapted to the radius of the inner wall of the heat pipe, and the small-caliber end is a liquid outlet end, and the radius of the working medium collector is adapted to the radius of the backflow conduit.
Preferably, the working medium collector is specifically a drainage strip, and comprises an arc section arranged around the circumference of the inner wall of the heat pipe and an inclined section connected with the arc section and extending downwards to the liquid inlet end of the working medium reflux catheter; the arc section is used as a liquid inlet end, and the tail end of the inclined section is used as a liquid outlet end.
Preferably, the liquid inlet end and the liquid outlet end of the working medium collector are both arranged at the middle upper part of the condensing section, and the liquid inlet end of the working medium reflux conduit extends upwards along the condensing section and is connected with the liquid outlet end of the working medium collector.
Preferably, the partition plate is of an arc structure, the outer arc edge of the partition plate is in airtight connection with the inner wall of the heat pipe, and the inner arc edge is used for supporting the working medium backflow conduit.
Preferably, the diameter of the drip hole at the bottom of the working medium reflux conduit is 1 mm-8 mm, and the distance between the holes is 10 mm-500 mm.
Preferably, the length of the condensing section is 2 m-5 m, and the length of the evaporating section is 5 m-20 m.
The invention also provides a construction method of the large-angle nearly horizontal heat pipe, which comprises the following steps:
Step one, drilling holes with corresponding apertures, corresponding lengths and corresponding directions along a design angle by utilizing a drilling machine according to the pipe diameter size and the length of the evaporation section of the heat pipe;
and secondly, keeping the condensing section of the heat pipe in a vertical state, and placing the evaporating section in the near-horizontal state into the drilling hole and fixing.
Compared with the prior art, the invention has the following advantages:
1. solves the problems of limited cooling range and vapor lock phenomenon of the evaporation section
According to the invention, the evaporation section of the heat pipe is designed to be large-angle and nearly horizontal, and the partition plates in the heat pipe are arranged, (1) the liquid working medium is uniformly distributed in the whole evaporation section, so that the whole evaporation section integrally works to form a linear cooling effect, the action range of the heat rod in the horizontal direction is greatly increased, (2) aiming at the situation that the temperature distribution of the evaporation section is different, the automatic balance evaporation effect is realized by the large cooling of the part with high ground temperature and the small cooling of the part with low ground temperature, and the uniformity of integral cooling is formed, (3) the establishment of channels for the reflux of the liquid working medium and the outgoing of the vapor working medium is realized, and the generation of vapor lock phenomenon is effectively prevented.
Further solves the problem of difficult reflux of working medium
According to the invention, on the basis of the partition plate, the problem of difficult working medium backflow of the near-horizontal heat pipe is effectively solved by arranging the working medium backflow conduit and the working medium collector, so that the evaporation section of the heat pipe can realize the long-distance and near-horizontal linear uniform cooling efficiency. In the concrete implementation, the length of the evaporation section can reach 5-20 m, so that the difficulty of long-distance and near-horizontal angle working medium backflow of the gravity type heat pipe in road engineering application is effectively solved.
Solving the problem of prominent diseases of the secondary engineering of the heat pipe roadbed and the difficult construction of the frozen soil highway
When the method is applied, the evaporation section is inserted into the roadbed in a nearly horizontal mode, a nearly horizontal linear and surface cooling process can be formed through parallel arrangement of heat pipes at a certain distance, the root of secondary diseases of the roadbed caused by insufficient efficiency of the conventional measures, severe fluctuation of an equivalent line at 0 ℃ in a warm season, poor symmetry of a ground temperature field and the like is effectively eliminated, and the special requirements of frozen soil broad-width roadbed on the cooling efficiency of the ground temperature field, the symmetry balance and the flatness of the ground temperature field are realized.
The biggest problem of the conventional heat pipe roadbed is that the freezing and thawing interface in warm seasons, namely the surface at 0 ℃, is severely fluctuated, so that the vast difference of different parts in the freezing and thawing process in the roadbed is caused, and a great amount of longitudinal cracking of the roadbed is caused. By the practical application of the heat pipe, the flatness of a freezing and thawing interface in the freezing and thawing process can be effectively formed, and the ground temperature field is balanced.
The outstanding problem of the frozen soil expressway is that under the condition that the width of the roadbed is large, uneven heat absorption and central heat accumulation of the roadbed are caused, so that the frozen soil freezing and thawing process and the ground temperature field difference at the lower part of the roadbed are continuously aggravated, and the stress field difference of the roadbed is increased. And under the condition of high-speed wide roadbed, how to perform balanced and effective regulation and control of the ground temperature field and smooth cooling is the most critical technical difficulty. The invention finds an effective solving way for solving the problem.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
FIG. 1 is a schematic view of a heat pipe according to the present invention.
FIG. 2 is a schematic view of another general structure of the heat pipe of the present invention.
FIG. 3 is a schematic view of another general structure of the heat pipe of the present invention.
FIG. 4 is a schematic diagram of the external structure of the heat pipe of the present invention.
Fig. 5 is a schematic side view of the working medium collector in a semi-conical structure.
Fig. 6 is a schematic diagram of the front view of the working medium collector in a semi-conical structure.
Fig. 7 is a schematic side view of the working fluid collector in the form of a drainage strip.
Fig. 8 is a schematic diagram of the front view structure of the working fluid collector in the case of drainage strips.
Fig. 9 is a schematic top view of the working fluid collector in the case of drainage strips.
Fig. 10 is a schematic side view of the working fluid collector in the upper middle of the condensing section.
In the figure: 1-pipe wall, 2-liquid suction core, 3-working medium reflux conduit, 4-working medium collector, 5-partition board and 6-dropping hole.
Detailed Description
Example 1 baffle-type Large-Angle nearly horizontal Heat pipe
Referring to fig. 1 and 4, the large-angle nearly horizontal heat pipe of the evaporation section of the present invention comprises an upper condensation section and a lower evaporation section, the overall shape is L-shaped, the condensation section is vertical to the horizontal plane, the angle α between the evaporation section and the horizontal plane is 0 ° to 45 ° (corresponding to "nearly horizontal"), that is, the angle between the condensation section and the evaporation section is 90 ° to 135 °, that is, the angle between the evaporation section and the reverse extension line of the condensation section is 45 ° to 90 ° (corresponding to "large angle", because the angle between the evaporation section and the reverse extension line of the condensation section is 0 ° to 45 ° in the prior art).
From the structural detail, the heat pipe mainly comprises a pipe wall 1, a partition board 5 and working media, wherein the partition board 5 and the working media are arranged inside the pipe wall 1. The plurality of partition boards 5 are arranged on the inner wall of the pipe at the bottom of the evaporation section at intervals to prevent the liquid working medium from flowing in the horizontal direction, and a plurality of semi-open small compartments are formed in the axial direction of the whole evaporation section through the adjacent partition boards 5. The height of the partition board 5 is 1/5-2/3 of the diameter of the inner wall of the heat pipe, and enough upper space is reserved in the pipe for the gaseous working medium to flow out. In practical application, the baffle 5 can adopt an arc structure, the outer arc edge is in airtight connection with the inner wall of the heat pipe, and the inner arc edge is used for supporting the working medium backflow conduit 3.
In practical application, the pipe diameter of the heat pipe is 80-120 mm, the length of the evaporation section of the heat pipe can reach 5-20 m, and the length of the condensation section is 2-5 m according to the regulation and control requirements of roadbed.
Working principle: and at the relatively low temperature of the outside, the heat pipe is in the working environment condition, and the evaporation section starts to work. The liquid working medium with the evaporation section in the semi-open compartment is in a continuous evaporation phase change process, is continuously evaporated from liquid to vapor, and is separated from the compartment to rise into the upper space, and the vapor working medium continuously enters the vertical condensation section through the space and the channel at the upper part under the pressure effect.
The condensing section is influenced by the outside, the temperature of the pipe wall is relatively low, the vapor state working medium starts to condense at the pipe wall and is converted into liquid state by the vapor state, the liquid state working medium continuously flows downwards along the vertical pipe wall under the action of gravity, and as the liquid state working medium increases, the liquid state working medium can sequentially flow over the first partition plate and the second partition plate, and is distributed in each partition chamber by analogy, and then enters the circulation of vaporization, condensation, downflow and distribution in each partition chamber.
The balanced cooling effect of the heat pipe is not only in the integral work of the evaporation section, but also in the difference of the working strength of different parts of the evaporation section. Under the condition that the ground temperature difference exists at different parts of the evaporation section, the heat pipe has the function of automatic balance evaporation in the evaporation section, namely the evaporation capacity of the part with relatively high ground temperature is relatively large, the other parts are relatively small, so that the part with large evaporation capacity is cooled more, and the other parts are cooled relatively less, thereby forming the uniformity of integral cooling.
In the invention, under the action of the partition plate 5, the liquid working medium in the prior art fills the whole cross section from the cross section of the stay part of the liquid working medium in the evaporation section of the heat pipe, but the liquid working medium is only positioned at the part of about 1/2 of the bottom of the heat pipe, thereby providing a foundation for establishing the channels of the liquid working medium in reflux and the vapor working medium in outgoing.
The invention uses the partition board 5 to divide the working medium in the evaporation section into different compartments. In practical application, the height of the compartment 5 can be set according to the temperature regulation and control requirements of different parts of the evaporation section, so that the reflux quantity of the working medium led into the compartment just meets the regulation and control requirements, and the aim of accurately controlling the temperature of the part is fulfilled.
Example 2 working matter reflux guide tube and working matter collector
Referring to fig. 1 and 4, on the basis of embodiment 1, the heat pipe of the present invention further comprises a working medium backflow conduit 3 and a working medium collector 4 which are arranged inside the pipe wall 1, so as to solve the problem of difficult backflow of the working medium of the near-horizontal heat pipe.
Specifically, the front and rear openings of the working medium reflux guide pipe 3 are provided with lengths which are adapted to the lengths of the evaporation sections, the working medium reflux guide pipe is arranged on the partition plate 5 and is at a certain height from the inner wall of the bottom pipe (for providing an accommodating space for the reflux liquid working medium), the bottom of the working medium reflux guide pipe is provided with a plurality of liquid dropping holes 6 (not shown in the figure) at intervals, and the reflux working medium can enter the inside of each compartment at intervals and uniformly distributed through the liquid dropping holes 6; it will be appreciated that each compartment corresponds to a drip opening 6.
According to the angle size of evaporation section contained angle alpha and the reflux smoothness demand, can set up all baffles 5 to equal height or not equal height, for example set up to equal height when contained angle alpha is great, when contained angle alpha is less, for example 0, can set up all baffles 5 according to from high to low for form the difference in height between the inlet and the liquid outlet of working medium backward flow pipe 3 in horizontal evaporation section, be convenient for the working medium backward flow.
The liquid inlet end of the working medium collector 4 is arranged on the inner wall of the heat pipe, the liquid outlet end is connected with the liquid inlet end of the working medium reflux conduit 3, and the working medium collector 4 is used for intercepting and collecting liquid working medium flowing down along the inner wall of the pipe and outputting the liquid working medium to the working medium reflux conduit 3.
In practical application, in terms of materials, the pipe wall 1 can be made of metal with good heat conduction performance such as stainless steel, copper, cast iron and the like; the working medium reflux conduit 3 can be made of nonmetal such as plastics, rubber, PVC, ceramics and the like, or metal materials such as stainless steel, copper, aluminum and the like; the working medium collector 4 is made of corrosion-resistant plastics or stainless steel, and the surface of the working medium collector can be subjected to hydrophilic treatment to improve the liquid collecting effect. The length of the working medium reflux conduit 3 is the same as that of the evaporating section in terms of the dimension, the pipe diameter is 10 mm-60 mm, the diameter of the opening of the liquid dropping hole 6 is 1 mm-8 mm, and the distance between the openings is 10 mm-500 mm.
Working principle:
The liquid working medium in the condensing section is intercepted and collected by the working medium collector 4 in the process of backflow, and then is led into the working medium backflow conduit 3. Under the action of gravity, the liquid working medium continuously flows back to the bottom along the working medium return conduit 3. Because the bottom of the working medium return conduit 3 is provided with continuous drip holes 6 at intervals, liquid working medium can be distributed in each compartment through the holes in the process of return flow.
In the invention, the reflux of the working medium has the driving function of gravity, and meanwhile, the construction of the height difference of the liquid inlet end and the liquid outlet end of the working medium reflux conduit 3 also has the driving function of the pressure of the liquid working medium, thereby ensuring the smooth reflux of the liquid working medium.
Because the working medium reflux conduit 3 is at a certain distance from the wall of the evaporation section, and the periphery of the working medium reflux conduit is mainly in a vapor state working medium under the working state, the working medium reflux conduit 3 cannot be subjected to more heat influence on the liquid working medium in the working medium reflux conduit 3. Furthermore, the working medium reflux conduit 3 is preferably made of a material with relatively poor heat conductivity (such as a nonmetal material of plastics, rubber, PVC, ceramics and the like), and has a certain heat preservation effect on the reflux working medium, and of course, a material of metal and the like can be also adopted, with a slightly poorer effect. Through the combined action of the two, the working medium is effectively ensured not to generate a transpiration phase change process in the reflux process, thereby ensuring the smooth reflux of the working medium.
Example 3 adding a wick
With reference to fig. 2, 3 and 4, on the basis of embodiment 2, the heat pipe of the present invention further comprises a wick 2 disposed below the working medium return conduit 3 in the compartment, where the wick 2 may be laid in whole segments, or may be laid in parts or intermittently, as required. The working medium return conduit 3 is positioned at the upper part or the central part of the liquid suction core 2; in order to increase the transpiration rate under working conditions of the working medium, the wick 2 should not be too thick. The liquid absorbing core 2 is made of hydrophilic material or surface is subjected to hydrophilic treatment, and the material can be sponge, glass fiber, metal wire and the like.
By utilizing the capillary adsorption action of the liquid absorption core material on the liquid working medium, the working medium flowing out through the liquid dropping hole 6 quickly infiltrates to the bottom of the evaporation section and is uniformly distributed in the liquid absorption core 2. The working medium is heated to form gas, and the gas is separated from the liquid suction core 2 to enter the upper space, so that strict separation of working medium steam and a working medium liquid passage is achieved, and the conveying limit can be improved by reducing the splashing limit of the liquid working medium.
In the case of a wick 2 arranged in the compartment, the working medium return conduit 3 may be supported by the wick 2, but may also be supported by the partition 5 as in example 2.
In order to further ensure the backflow of the working medium, the working medium collector 4 can be arranged at different positions according to different inclination conditions of the evaporation section of the heat pipe.
When the inclination angle of the evaporation section is larger, that is, the included angle between the evaporation section and the horizontal plane is about 25-40 degrees, the working medium collector 4 is positioned at a lower position, for example, near the junction of the condensation section and the evaporation section, and working medium collected and flowing into the working medium return pipe 3 can smoothly flow through the whole working medium return pipe 3 and the liquid dropping hole 6 under the action of gravity, and the working medium is uniformly distributed in the whole evaporation section. See example 4 and example 5.
When the inclination angle of the evaporation section is smaller, namely the included angle alpha between the evaporation section and the horizontal plane is about 0-25 degrees, the working medium collector 4 is positioned at a higher position, and working medium collected and flowing into the working medium return pipe 3 can generate certain pressure in the working medium return pipe 3 due to the existence of the height, so that the working medium is forced to quickly return under the dual action of gravity and pressure. See example 6.
Example 4 working medium collector is of a half conical table structure
Referring to fig. 5, 6 and 4, the working medium collector 4 is specifically of a thin-walled semi-conical structure, and has an opening along the axial direction, a large-caliber end serving as a liquid inlet end, a radius corresponding to the radius of the inner wall of the heat pipe and tightly connected with the inner wall of the heat pipe so as to block and intercept the backflow working medium, and a small-caliber end serving as a liquid outlet end, wherein the radius corresponding to the radius of the working medium backflow conduit 3 and tightly connected with the liquid inlet end of the backflow conduit 3 so as to dredge the intercepted working medium to enter the working medium backflow conduit 3.
The liquid inlet end of the working medium collector 4 can be arranged at a position below the junction of the condensing section and the evaporating section, and liquid working media flowing down along the inner wall of the condensing section are collected at the position below the junction and then blocked and intercepted by the liquid inlet end.
Example 5 working fluid collector is a drainage strip
Referring to fig. 7, 8, 9 and 4 (the partition 5 is not shown in the drawings), the working medium collector 4 is specifically a drainage strip, and comprises an arc section arranged around the inner wall of the heat pipe and an inclined section connected with the arc section and extending downwards to the liquid inlet end of the working medium return conduit 3; the arc section is used as a liquid inlet end, and the tail end of the inclined section is used as a liquid outlet end. In order to accelerate the reflux speed, the arc-shaped section is provided with a downward slope while being arranged around the circumference of the inner wall of the heat pipe, and is converged at the lowest point and then is led to the liquid inlet end of the working medium reflux conduit 3 through the inclined section.
In practical application, the drainage strip is in a narrow strip shape, so that the flowing process of the steam state working medium is not influenced; the drainage strip is made of hydrophilic material or has been subjected to hydrophilic treatment on the surface, and sponge, glass fiber, metal wire and the like can be selected.
The liquid inlet end of the working medium collector 4 can be arranged at an upper position of the junction of the condensing section and the evaporating section, and the liquid working medium flowing down along the whole circumference of the inner wall of the condensing section is blocked and intercepted by the liquid inlet end before reaching the corner of the junction or just reaching the corner.
Example 6 working medium collector is placed in the middle-upper portion of condensing zone
Referring to fig. 10 and 4, the liquid inlet end and the liquid outlet end of the working medium collector 4 are both arranged at the middle upper part of the condensing section, and the liquid inlet end of the working medium reflux conduit 3 extends upwards along the condensing section and is connected with the liquid outlet end of the working medium collector 4. For a specific structure of the working medium collector 4, reference is made to the case of the drainage strips in example 5.
The working medium collector 4 collects the working medium condensed at the middle upper part of the condensing section, and the working medium is conveyed to the far end of the horizontal evaporation section through the working medium reflux conduit 3 under the action of high potential energy; the condensing working medium at the lower part of the condensing section automatically flows into the near end of the evaporating section under the action of gravity, wherein, as the condensing working medium increases, the condensing working medium can sequentially overflow the first partition plate, the second partition plate and so on.
Example 7 construction method of large-angle approximately horizontal heat pipe of evaporation section
The construction method of the heat pipe disclosed in each embodiment refers to the following steps:
(1) Drilling holes with corresponding apertures, corresponding lengths and corresponding directions along a design angle by utilizing a drilling machine according to the pipe diameter size and the length of the evaporation section of the heat pipe;
(2) And (3) keeping the condensing section of the heat pipe in a vertical state, and placing the evaporating section in a near horizontal state into a drill hole and fixing.
The technical scheme provided by the invention is described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (1)
1. The construction method of the large-angle nearly horizontal heat pipe of the evaporating section, the included angle between the condensing section and the evaporating section of the large-angle nearly horizontal heat pipe of the evaporating section is 90-135 degrees, which specifically comprises a pipe wall (1), a baffle plate (5) and a working medium, wherein the baffle plate (5) and the working medium are arranged in the pipe wall (1);
A plurality of partition boards (5) are arranged on the inner wall of the pipe at the bottom of the evaporation section at intervals so as to form a plurality of semi-open compartments in the axial direction of the whole evaporation section; the height of the partition plate (5) is 1/5-2/3 of the diameter of the inner wall of the heat pipe; the heat pipe also comprises a working medium reflux conduit (3) and a working medium collector (4) which are arranged in the pipe wall (1);
The working medium reflux guide pipe (3) is provided with front and rear openings, is arranged on the partition plate (5) and is at a certain height from the inner wall of the bottom pipe, and a plurality of liquid dropping holes (6) are arranged at the bottom of the working medium reflux guide pipe at intervals; -each of said compartments corresponds to a said drip hole (6);
The liquid inlet end of the working medium collector (4) is arranged on the inner wall of the heat pipe, the liquid outlet end of the working medium collector is connected with the liquid inlet end of the working medium reflux pipe (3), and the working medium collector (4) is used for intercepting and collecting liquid working medium flowing down along the inner wall of the pipe and outputting the liquid working medium to the working medium reflux pipe (3); the heat pipe also comprises a liquid suction core (2) arranged below the working medium return conduit (3) in the compartment; the working medium return conduit (3) is supported by the liquid suction core (2) or by the partition board (5); the working medium collector (4) is of a cone frustum structure with an opening along the axial direction, the large-caliber end is a liquid inlet end, the radius of the large-caliber end is matched with the radius of the inner wall of the heat pipe, and the small-caliber end is a liquid outlet end, and the radius of the small-caliber end is matched with the radius of the working medium return conduit (3); the working medium collector (4) is specifically a drainage strip and comprises an arc section arranged around the circumference of the inner wall of the heat pipe and an inclined section connected with the arc section and extending downwards to the liquid inlet end of the working medium reflux conduit (3); the arc section is used as a liquid inlet end, and the tail end of the inclined section is used as a liquid outlet end; the liquid inlet end and the liquid outlet end of the working medium collector (4) are arranged at the middle upper part of the condensing section, and the liquid inlet end of the working medium reflux conduit (3) extends upwards along the condensing section and is connected with the liquid outlet end of the working medium collector (4); the partition plate (5) is of an arc structure, the outer arc edge of the partition plate is in airtight connection with the inner wall of the heat pipe, and the inner arc edge is used for supporting the working medium backflow conduit (3); the diameter of a liquid dropping hole (6) at the bottom of the working medium reflux conduit (3) is 1 mm-8 mm, and the spacing between the holes is 10 mm-500 mm; the length of the condensing section is 2 m-5 m, and the length of the evaporating section is 5 m-20 m; the construction method is characterized by comprising the following steps:
Step one, drilling holes with corresponding apertures, corresponding lengths and corresponding directions along a design angle by utilizing a drilling machine according to the pipe diameter size and the length of the evaporation section of the heat pipe;
and secondly, keeping the condensing section of the heat pipe in a vertical state, and placing the evaporating section in the near-horizontal state into the drilling hole and fixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910610500.XA CN110260695B (en) | 2019-07-08 | 2019-07-08 | Large-angle approximately-horizontal heat pipe with evaporation section and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910610500.XA CN110260695B (en) | 2019-07-08 | 2019-07-08 | Large-angle approximately-horizontal heat pipe with evaporation section and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110260695A CN110260695A (en) | 2019-09-20 |
| CN110260695B true CN110260695B (en) | 2024-09-17 |
Family
ID=67924911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910610500.XA Active CN110260695B (en) | 2019-07-08 | 2019-07-08 | Large-angle approximately-horizontal heat pipe with evaporation section and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110260695B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762745B (en) * | 2021-01-26 | 2024-10-18 | 江苏苏净集团有限公司 | Heat pipe |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6223810B1 (en) * | 1998-03-31 | 2001-05-01 | International Business Machines | Extended air cooling with heat loop for dense or compact configurations of electronic components |
| CN201843036U (en) * | 2010-10-24 | 2011-05-25 | 西南交通大学 | Roadbed heating rod |
| CN210268325U (en) * | 2019-07-08 | 2020-04-07 | 俞祁浩 | Large-angle nearly-horizontal heat pipe of evaporation section |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101307996B (en) * | 2007-05-17 | 2010-06-02 | 私立淡江大学 | Flat-plate evaporator structure and loop type heat pipe with same |
-
2019
- 2019-07-08 CN CN201910610500.XA patent/CN110260695B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6223810B1 (en) * | 1998-03-31 | 2001-05-01 | International Business Machines | Extended air cooling with heat loop for dense or compact configurations of electronic components |
| CN201843036U (en) * | 2010-10-24 | 2011-05-25 | 西南交通大学 | Roadbed heating rod |
| CN210268325U (en) * | 2019-07-08 | 2020-04-07 | 俞祁浩 | Large-angle nearly-horizontal heat pipe of evaporation section |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110260695A (en) | 2019-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104296425A (en) | Heat exchanger | |
| CN101029803B (en) | Evaporator and heat absorber of separated gravity hot pipe | |
| CN105157441A (en) | Multi-tube-row integrated header automatic adjusting dispensing condenser | |
| CN110260695B (en) | Large-angle approximately-horizontal heat pipe with evaporation section and construction method thereof | |
| CN106679250A (en) | Gas-liquid separation device and condensation evaporator with gas-liquid separation function | |
| CN210268325U (en) | Large-angle nearly-horizontal heat pipe of evaporation section | |
| CN106802027A (en) | A kind of composite wind-cooled fin-tube type heat exchanger structure | |
| CN111219890B (en) | A heat collecting plate with liquid storage area | |
| CN110160284B (en) | Refrigeration device | |
| CN114383333B (en) | a heat exchange device | |
| CN102072682A (en) | Evaporation pipes and heat absorber of separated gravity assisted heat pipe | |
| CN118009772B (en) | An ultra-long gravity heat pipe that overcomes hydraulic effect and enhances heat transfer | |
| CN210425661U (en) | Energy-saving cooling equipment installed on the evaporative cooling coil | |
| CN204555365U (en) | A kind of solar heat tubular type vacuum tube collector improving heat transfer efficiency | |
| CN106440324B (en) | Heat exchanger and air conditioner adopting same | |
| CN214194491U (en) | Novel combined hot rod | |
| CN212006306U (en) | Siphon evaporator | |
| RU2764141C1 (en) | Corrugated heat pipe | |
| CN110940221B (en) | Baffle plate, heat exchanger and air conditioner | |
| US3536134A (en) | Condenser | |
| CN211650777U (en) | Heat-collecting plate with liquid storage area | |
| CN209820204U (en) | microchannel heat exchanger | |
| WO2018040034A1 (en) | Micro-channel heat exchanger and air-cooled refrigerator | |
| CN210486170U (en) | A gravity-fed liquid evaporator | |
| RU149337U1 (en) | GRAVITATIONAL HEAT PIPE |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |