Backflow type gravity assisted heat pipe for road snow melting

Abstract

The utility model relates to the technical field of road construction, in particular to a backflow type gravity assisted heat pipe for road snow melting, which comprises an L-shaped heat pipe body with two closed ends, a passive film arranged at the inner end of the heat pipe body, a backflow pipe mounted at the inner end of the heat pipe body, a condensation section arranged at the transverse end of the heat pipe body, and a heat exchange section arranged at the transverse end of the heat pipe body. A heat insulation section and an evaporation section are arranged at the vertical end of the heat pipe body from top to bottom; the inner end of the evaporation section is filled with a liquid working medium, the outer end of the heat insulation section is connected with a foaming heat insulation layer through a protection layer, and a heat dissipation part is arranged at the outer end of the condensation section. In winter, the temperature of the evaporation section is high, the temperature of the condensation section is low, a working medium in the heat pipe body evaporates from the evaporation section, upwards reaches the condensation section, releases heat and condenses at the condensation section, and then flows back to the evaporation section along the return pipe under the action of gravity, so that heat transfer is realized, and snow on the road surface is removed.

Description

TECHNICAL FIELD

[0001] The utility model relates to road construction technical field, concretely is a kind of backflow type gravity heat pipe for road snow melting. BACKGROUND

[0002] 75% of the land area of our country is in frozen region. In cold winter, the snow on the surface of road is easily formed into thin ice under the joint action of low temperature and vehicle load, which threatens the safety of road traffic. According to test, the adhesion coefficient of asphalt pavement will be reduced by 51%~74% under the condition of ice and snow. The reduction of adhesion coefficient of pavement makes the stability of braking direction of automobile worse, which often leads to the loss of control of vehicle direction, brake failure and significant extension of braking distance. Moreover, the driver drives on the ice and snow road, which is stimulated by strong light reflection, and then leads to frequent traffic accidents, threatening the safety of people's life and property. Relevant statistics show that the traffic accidents caused by road snow and ice account for 35% of the total amount of winter traffic accidents. At the same time, the design of road in ice and snow area is also one of the problems that have long plagued road workers. In order to ensure the traffic safety and capacity of key nodes such as long and large longitudinal slope, curve, tunnel entrance and exit, bridge and so on under the condition of ice and snow, the road designers have to take measures such as extending the length of slope and changing the radius of curve to ensure the smooth traffic of vehicle in ice and snow weather. However, the above measures not only greatly increase the construction cost of road, but also bring many inconveniences to the life and production of residents and enterprises along the road.

[0003] Under the background of carbon peak and carbon neutralization, the emerging technology of energy-saving and carbon-reducing traffic infrastructure is developed vigorously. The gravity heat pipe heating road snow melting system utilizes renewable energy geothermal energy to realize the active ice melting and snow removing of road, avoids the energy consumption, emission and pollution problems caused by mechanical snow removing and snow melting agent production, and is a high-efficiency, low-carbon and environmentally-friendly road snow removing technology. However, the gravity heat pipe is restricted by many problems such as insufficient construction conditions and poor heat transfer efficiency, and cannot be reasonably applied in all projects. It is of great significance to accelerate the pace of reducing carbon emission, guide green technology innovation and explore the application of more reasonable and efficient gravity heat pipe to collect shallow geothermal energy to achieve the "active" snow melting and ice melting of road in winter. CONTENT OF UTILITY MODEL

[0004] The utility model aims at providing a backflow type gravity heat pipe for road snow melting to solve the problems in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme: a backflow type gravity heat pipe for road snow melting, comprising: a heat pipe body, the heat pipe body is L-shaped, and both ends are closed, the inner end of the heat pipe body is provided with a passivation film, the inner end of the heat pipe body is installed with a backflow pipe, the horizontal end of the heat pipe body is a condensation section, and the vertical end of the heat pipe body is an adiabatic section and an evaporation section from top to bottom.

[0006] The inner end of the evaporation section is filled with liquid working medium, the outer end of the adiabatic section is connected with a foamed adiabatic layer through a protective layer, and the outer end of the condensation section is provided with a heat dissipation component.

[0007] Preferably, the included angle of the condensation section and the adiabatic section is 85-90°.

[0008] Preferably, the outer wall of the evaporation section is coated with a waterproof layer one, the outer part of the waterproof layer one is wrapped with a layer of glass fiber cloth, and the outer part of the glass fiber cloth is coated with a waterproof layer two.

[0009] Preferably, the outer side of the adiabatic section is sleeved with a protective layer, and the protective layer and the adiabatic section are filled with a foamed adiabatic layer.

[0010] Preferably, the inner wall of the condensation section is provided with a semicircle array outward convex heat dissipation surface at the upper part, is provided with a flow collection groove at the bottom end, and is connected with a backflow surface between the flow collection groove and the heat dissipation surface.

[0011] Preferably, the heat dissipation component comprises a plurality of arc-shaped blocks, each of the arc-shaped blocks is fixedly installed with a heat dissipation block at the outer end, and the width of the heat dissipation block gradually narrows from inside to outside.

[0012] Preferably, the plurality of arc-shaped blocks are attached to the outer side of the condensation section, and the left and right ends of the plurality of arc-shaped blocks are fixed to the outer side of the condensation section through hoops.

[0013] Preferably, the heat pipe body is arranged along the road in the longitudinal direction at equal intervals, the vertical evaporation section of the heat pipe body is arranged in the road median strip or the green belt, and the transverse condensation section extends to the road shoulder along the transverse direction of the lane.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] In winter, the temperature of the evaporation section is high, and the temperature of the condensation section is low, the working medium in the heat pipe body evaporates from the evaporation section, goes up to the condensation section, releases heat and condenses at the position of the condensation section, and then flows back to the evaporation section along the backflow pipe under the action of gravity, so that heat transfer is realized, and the road surface is snow-melted. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view of the overall structure of the utility model;

[0017] Figure 2 It is an expanded view of the overall structure of the utility model;

[0018] Figure 3 It is a cross-sectional view of the heat pipe body of the utility model;

[0019] Figure 4 It is a sectional view of the evaporation section of the utility model;

[0020] Figure 5 It is the cross section schematic view of the heat insulation section of the utility model;

[0021] Figure 6 It is the cross section schematic view of the condensing section of the utility model.

[0022] In the drawing: 101, heat pipe body; 1, evaporating section; 2, heat insulation section; 3, condensing section; 4, reflux pipe; 5, liquid working medium; 6, passivation film; 7, waterproof layer one; 8, glass fiber cloth; 9, waterproof layer two; 10, protective layer; 11, foamed heat insulation layer; 12, waterproof layer three; 13, heat dissipation surface; 14, reflux surface; 15, collecting groove; 16, arc block; 17, heat dissipation block; 18, hoop. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme of the utility model carry out clearly, completely describe, and the advantage is more clear and distinct, the following combining with the drawing to the utility model embodiment carries out further detailed explanation.Should understand, the specific embodiment described here is a part of the embodiment of the utility model, instead of all the embodiments, only use to explain the embodiment of the utility model, and does not use to limit the embodiment of the utility model, all other embodiments obtained by the ordinary skill in the art without making the creative labor belongs to the scope of the protection of the utility model.

[0024] Please refer to Figures 1 to 6 The utility model provides a kind of technical scheme: a kind of reflux type gravity heat pipe for road snow melting, it include: heat pipe body 101, heat pipe body 101 is L-shaped, and both ends are closed, the inner end of heat pipe body 101 is provided with passivation film 6, passivation film 6 is inorganic material combination, the inner end of heat pipe body 101 is equipped with reflux pipe 4, the lateral end of heat pipe body 101 is condensing section 3, the vertical end of heat pipe body 101 is from top to bottom heat insulation section 2 and evaporating section 1, heat pipe body 101 is sealed as a whole, inside extraction air is in vacuum state, pre-injection appropriate liquid working medium 5, connecting place all uses argon arc welding continuous welding, the included angle of condensing section 3 and heat insulation section 2 is 85 ° ~ 90 °, reflux pipe 4 is L-shaped, one end is located in condensing section 3, the other end extends to evaporating section 1, the included angle between reflux pipe 4 is 90 ° ~ 93 °, and one end in condensing section 3 is higher, condensing section 3 and road surface transverse drainage slope are consistent and present one side high one side low state, can make the condensing medium of condensing section 3 flow to condensing section 3 end faster, converge to reflux pipe 4 and then reflux to evaporating section 1.

[0025] The outer end of heat insulation section 2 is connected with foamed heat insulation layer 11 by protective layer 10, a layer of certain wall thickness protective layer 10 is arranged outside heat insulation section 2, protective layer 10 is made of high-density polyethylene and is prefabricated into plastic pipe, hard urethane foam plastic stock solution is injected into the cavity between protective layer 10 and heat pipe body 101 pipe wall, and foamed heat insulation layer 11 is formed by foaming hard polyurethane foam plastic stock solution.

[0026] The outer wall of the evaporation section 1 is coated with a waterproof layer 7, the outside of the waterproof layer 7 is wrapped with a layer of glass fiber cloth 8, the outside of the glass fiber cloth 8 is coated with a waterproof layer 2 9, both waterproof layers are polyurethane paint, which prevents corrosion caused by long-term burial in the soil.

[0027] The upper part of the inner wall of the condensation section 3 is provided with a semicircle array-shaped outward convex heat dissipation surface 13, which increases the condensation heat dissipation area of the medium and improves the heat conduction efficiency, and the bottom end is provided with a flow collection groove 15, and the flow collection groove 15 and the heat dissipation surface 13 are connected with a backflow surface 14, the condensed working medium is collected to the flow collection groove 15 through the backflow surface 14, and then flows back to the end of the condensation section 3 and is collected into the backflow pipe 4, and then flows back to the evaporation section 1, and the outer end of the condensation section 3 is coated with a waterproof layer 3 12, which is polyurethane paint.

[0028] The outer end of the condensation section 3 is provided with a heat dissipation component, the heat dissipation component comprises a plurality of arc-shaped blocks 16, the outer end of each arc-shaped block 16 is fixedly installed with a heat dissipation block 17, the width of the heat dissipation block 17 gradually narrows from inside to outside, the plurality of arc-shaped blocks 16 are attached to the outer side of the condensation section 3, the left and right ends of the plurality of arc-shaped blocks 16 are fixed to the outer side of the condensation section 3 through hoops 18, and the heat dissipation block 17 increases the contact area between the condensation section 3 and the road surface, and more efficiently transmits heat to the road surface.

[0029] The heat pipe body 101 is arranged along the road in an equal interval, the vertical evaporation section 1 is arranged in the middle isolation belt or green belt of the road, heat is absorbed from the stratum to transfer heat to the road surface, the transverse condensation section 3 extends to the road shoulder along the transverse direction of the lane, the heat pipe as a whole operates in a one-way circulation state, the tangential friction force generated by the reverse motion between the ascending steam and the backflow liquid working medium 5 of the traditional heat pipe is eliminated, the backflow speed of the liquid working medium 5 is accelerated, and the overall heat conduction efficiency of the heat pipe is improved.

[0030] When the device works, the heat pipe body 101 is buried in the stratum, the condensation section 3 is arranged along the road surface, heat is transferred to the road surface, in summer, the temperature of the condensation section 3 of the heat pipe is high, the temperature of the evaporation section 1 is low, the internal working medium is in a gaseous state as a whole, heat is transferred from the condensation section 3 to the evaporation section 1, and a small amount of heat is stored in the stratum under the roadbed; in winter, the heat pipe normally operates, the temperature of the evaporation section 1 is high, the temperature of the condensation section 3 is low, the working medium in the heat pipe body 101 evaporates from the evaporation section 1, goes up to the condensation section 3, releases heat and condenses at the position of the condensation section 3, and then flows back to the evaporation section 1 along the backflow pipe 4 under the action of gravity, so that heat is transferred and the road surface is snow-melted.

[0031] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A return-flow type gravity heat pipe for road snow melting, characterized by: Include: The heat pipe body (101), the heat pipe body (101) is L-shaped, and both ends are closed, the inner end of the heat pipe body (101) is provided with a passivation film (6), the inner end of the heat pipe body (101) is provided with a reflux pipe (4), the horizontal end of the heat pipe body (101) is a condensation section (3), and the vertical end of the heat pipe body (101) is an adiabatic section (2) and an evaporation section (1) from top to bottom; The inner end of the evaporation section (1) is filled with liquid working medium (5), the outer end of the adiabatic section (2) is connected with a foamed heat insulation layer (11) through a protective layer (10), and the outer end of the condensation section (3) is provided with a heat dissipation component.

2. A return-flow type gravity heat pipe for road snow melting according to claim 1, characterized in that: The included angle of the condensation section (3) and the adiabatic section (2) is 85°-90°.

3. A return-flow type gravity heat pipe for road snow melting according to claim 1, characterized in that: The outer wall of the evaporation section (1) is coated with a waterproof layer one (7), the outer part of the waterproof layer one (7) is wrapped with a layer of glass fiber cloth (8), and the outer part of the glass fiber cloth (8) is coated with a waterproof layer two (9).

4. A return-flow type gravity heat pipe for road snow melting according to claim 1, characterized in that: The outer side of the adiabatic section (2) is sleeved with a protective layer (10), and the foamed heat insulation layer (11) is filled between the protective layer (10) and the adiabatic section (2).

5. A return-flow type gravity heat pipe for road snow melting according to claim 1, characterized in that: The inner wall of the condensation section (3) is provided with a semicircle array-shaped outward convex heat dissipation surface (13) on the upper part, and is provided with a flow collection groove (15) at the bottom end, and the flow collection groove (15) and the heat dissipation surface (13) are connected with a reflux surface (14).

6. A return-flow type gravity heat pipe for road snow melting according to claim 1, characterized in that: The heat dissipation component includes a plurality of arc blocks (16), the outer end of each arc block (16) is fixedly installed with a heat dissipation block (17), and the width of the heat dissipation block (17) gradually narrows from inside to outside.

7. A return-flow type gravity heat pipe for road snow melting according to claim 6, characterized in that: A plurality of the arc blocks (16) are attached to the outer side of the condensation section (3), and the left and right ends of the plurality of arc blocks (16) are fixed to the outer side of the condensation section (3) through hoops (18).

8. A return-flow type gravity heat pipe for road snow melting according to claim 1, characterized in that: The heat pipe body (101) is arranged along the road in the longitudinal direction at equal intervals, the vertical evaporation section (1) of the heat pipe body (101) is arranged in the road median strip or green belt, and the horizontal condensation section (3) extends to the road shoulder along the horizontal direction of the lane.

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