A vacuum tunnel heat dissipation device

Abstract

The invention discloses a vacuum tunnel heat dissipation device, which relates to the technical field of tunnels, and comprises: a plurality of sleeves sleeved in the vacuum tunnel and a plurality of heat dissipation pipes with closed top ends arranged on the outer wall of the sleeve, wherein the heat dissipation pipes extend from the outer wall of the sleeve obliquely upward or directly upward, and the sleeve comprises: an inner tube and an outer tube sleeved together at intervals, and a receiving cavity with closed ends is formed between the inner tube and the outer tube, and a liquid phase-change heat transfer medium is arranged in the receiving cavity, and the heat dissipation pipes are arranged on the outer tube and communicated with the receiving cavity. The heat dissipation device can absorb, convert, transmit, release and transfer excess heat energy in the pipeline, has a simple structure, high reliability and no energy consumption, and is effectively used for waste heat transfer, and stably guarantees the thermal environment of the train pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of tunnels, and in particular to a vacuum tunnel heat dissipation device. Background Art

[0002] Railways play a vital role in the country's economic and social development. With the construction of the national railway network and the people's increasing demand for time, the railway will also face the problem of further speeding up. When the train speed is increased to more than 400km / h, air resistance will account for more than 90% of the total resistance, seriously affecting the energy consumption of train operation; aerodynamic noise increases sharply with the speed, seriously affecting the surrounding living environment; external climatic conditions such as crosswinds will aggravate the safety hazards of train operation stability. Such problems will follow one after another for high-speed trains running under normal pressure, so the idea of ​​building a vacuum operating environment came into being, and the application of underground vacuum pipeline trains will also be a trend in future research fields. When the low vacuum degree in the pipeline is 0.1-0.4 atmospheres, the high-speed train will generate a lot of heat due to friction with the air. According to research literature, the average temperature in the pipeline will reach 80 to 100 degrees. If in a closed pipeline, considering that the train has been departing many times, the heat has been accumulated and cannot be efficiently processed and discharged, resulting in a poor pipeline thermal environment, posing a huge threat to the track, the body, and safe driving.

[0003] With the development of science and technology and in-depth research on vacuum tube supersonic trains, a large amount of aerodynamic heat needs to be transferred in the pipeline. Since the research in this field is still in the exploratory stage, when it is promoted to practical applications in the future, the device for pipeline heat transfer will become a necessary auxiliary component of vacuum tube supersonic trains. Summary of the invention

[0004] The purpose of the present invention is to provide a vacuum tunnel heat dissipation device, which can absorb, convert, transmit, release and transfer excess heat energy in the pipeline, has a simple structure, high reliability and no energy consumption; it is effectively used for waste heat transfer and stably guarantees the thermal environment of the train pipeline.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A vacuum tunnel heat dissipation device comprises: a plurality of sleeves sleeved in the vacuum tunnel and a plurality of heat dissipation pipes with closed top ends arranged on the outer wall of the sleeve, the heat dissipation pipes extending obliquely upward or directly upward from the outer wall of the sleeve, the sleeve comprising: an inner tube and an outer tube sleeved together at intervals, a receiving cavity with closed ends formed between the inner tube and the outer tube, a liquid phase change heat transfer medium arranged in the receiving cavity, and the heat dissipation pipes arranged on the outer tube and connected with the receiving cavity.

[0007] The present solution provides a heat dissipation device arranged in a vacuum tunnel, wherein a sleeve is arranged in the vacuum tunnel, and a plurality of sleeves are arranged continuously along the extension direction of the vacuum tunnel, the profile of the sleeve is not specifically limited, and can match the shape of the vacuum tunnel, and the cross section is circular or elliptical, the sleeve comprises an inner tube and an outer tube, and a receiving cavity is formed between the inner and outer tubes, and both ends of the receiving cavity are sealed, and a liquid phase change heat transfer medium is arranged in the receiving cavity, and the liquid phase change heat transfer medium can evaporate when absorbing heat and condense when releasing heat, and the type of the liquid phase change heat transfer medium is not specifically limited, and can be based on The selection is based on the actual temperature and heat dissipation requirements. The following options can be chosen: water, ethanol, methanol, etc.; a heat dissipation pipe connected to the containing cavity is provided on the outer tube. The heat generated by the train operation is transferred to the liquid phase change heat transfer medium by the inner tube. The liquid phase change heat transfer medium absorbs the heat and evaporates into the heat dissipation pipe, and condenses into liquid in the heat dissipation pipe. Since the heat dissipation pipe is inclined upward or obliquely upward from the tube wall of the outer tube, the liquid phase change heat transfer medium condensed in the heat dissipation pipe can flow back to the containing cavity under the action of gravity, thereby completing the heat dissipation process and the circulation process of the phase change heat transfer medium.

[0008] Furthermore, in a preferred embodiment of the present invention, a connecting pipe communicating with the accommodating cavity is provided on the outer tube, and the lower end of the heat dissipation pipe is sealed and connected to the connecting pipe.

[0009] A short section of connecting pipe is provided on the outer wall of the outer tube and is arranged in the same direction as the heat dissipation pipe. The diameter of the heat dissipation pipe matches the diameter of the connecting pipe. The lower end of the heat dissipation pipe is arranged on the connecting pipe to realize the fixed connection between the heat dissipation pipe and the outer tube. The heat dissipation pipe and the connecting pipe can be plugged, clamped or threaded. However, no matter which connection method is used, the sealing connection between the heat dissipation pipe and the connecting pipe should be ensured.

[0010] Furthermore, in a preferred embodiment of the present invention, a sleeve is provided on the connecting pipe, and one end of the sleeve away from the connecting pipe is sealedly connected to the heat dissipation pipe.

[0011] The heat dissipation pipe is sealed and connected to the connecting pipe through the sleeve. At this time, the diameter of the heat dissipation pipe and the diameter of the connecting pipe do not need to match. Similarly, the sleeve and the connecting pipe and the heat dissipation pipe can be connected by plugging, clamping or threading, and the sealing of the connection is guaranteed.

[0012] Furthermore, in a preferred embodiment of the present invention, the outer wall of the outer tube is provided with a heat insulating layer.

[0013] The outer wall of the outer tube is provided with a heat insulating layer to prevent external heat from being transferred to the liquid phase change heat transfer medium.

[0014] Furthermore, in a preferred embodiment of the present invention, both the inner tube and the heat dissipation tube are high thermal conductivity and corrosion-resistant tubes.

[0015] The inner tube adopts a high thermal conductivity and corrosion-resistant tube, which can improve the heat conduction efficiency from the vacuum tunnel to the liquid phase change heat transfer medium. The heat dissipation tube adopts a high thermal conductivity and corrosion-resistant tube, which can improve the heat conduction efficiency of the vaporized liquid phase change heat transfer medium to the outside world.

[0016] Furthermore, in a preferred embodiment of the present invention, the heat dissipation pipes are evenly distributed on the outer wall of the outer pipe.

[0017] The heat dissipation pipes are evenly arranged on the outer wall of the outer tube, which is beneficial to evenly dissipate heat for the vacuum tunnel.

[0018] The present invention has the following beneficial effects:

[0019] The present invention provides a heat dissipation device for a vacuum tunnel. The device provides a circulation loop for a liquid phase change heat transfer medium by arranging a sleeve and a heat dissipation pipe, and conducts away the heat generated by the vacuum tunnel through the heat absorption and release during the phase change of the liquid phase change heat transfer medium. The entire device has a simple and reliable structure, a long service life, a high overall heat transfer efficiency, a fast startup speed, and does not consume additional energy during the working process. It is flexible to use and does not require excessive maintenance. It is effectively used for waste heat transfer and stably ensures the thermal environment of train pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the vacuum tunnel heat dissipation device in Example 1;

[0021] Figure 2 It is a longitudinal cross-sectional view of the vacuum tunnel heat dissipation device in Example 1;

[0022] Figure 3 It is a longitudinal cross-sectional view of the vacuum tunnel heat dissipation device in Example 2;

[0023] Figure 4 This is a longitudinal cross-sectional view of the vacuum tunnel heat dissipation device in Example 3.

[0024] Among them: 1-sleeve; 11-inner tube; 12-outer tube; 121-connecting tube; 13-accommodating chamber; 2-heat dissipation tube; 3-sleeve. DETAILED DESCRIPTION

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0026] Example 1

[0027] Reference Figure 1 A vacuum tunnel heat dissipation device comprises: a sleeve 1 sleeved in the vacuum tunnel and a plurality of heat dissipation pipes 2 with closed tops arranged on the outer wall of the sleeve 1. The length of each sleeve 1 and the number of sleeves 1 are determined according to the actual construction and the length of the tunnel.

[0028] Reference Figure 1 and Figure 2 The heat dissipation pipe 2 is extended upward from the outer wall of the sleeve 1. In this embodiment, the sleeve 1 and the heat dissipation pipe 2 are both circular pipes. The sleeve 1 includes: an inner pipe 11 and an outer pipe 12 which are sleeved together at intervals. A receiving chamber 13 with closed ends is formed between the inner pipe 11 and the outer pipe 12. A liquid phase-change heat transfer medium is arranged in the receiving chamber 13. Through holes are evenly spaced along the axis extension direction of the outer pipe 12 on the outer wall just above the outer pipe 12. A small section of a connecting pipe 121 which is integrally formed with the outer pipe 12 and extends vertically upward is arranged at the edge of the through hole. A sleeve 3 is arranged at the upper end of the connecting pipe 121. The heat dissipation pipe 2 is arranged in the sleeve 3. The sleeve 3 is connected to the connecting pipe 121 and the heat dissipation pipe 2 by threads. To ensure the sealing performance, sealing parts such as sealing tape and gaskets can be added at the connection in actual construction.

[0029] The outer wall of the outer tube 12 is provided with a heat insulation layer, and the inner tube 11 and the heat dissipation tube 2 are both high heat conductivity and corrosion resistant tubes.

[0030] Combine the following Figure 1 and Figure 2 Introduce the working principle and process of the device:

[0031] The aerodynamic heat generated by the vacuum supersonic train passing through the pipeline is directly released into the vacuum pipeline, and the heat is directly transferred to the wall of the vacuum pipeline, that is, the inner wall of the inner tube 11. The inner tube 11 absorbs the heat and transfers the heat to the liquid phase change heat transfer medium in the accommodating chamber 13. The liquid phase change heat transfer medium absorbs heat and evaporates and changes into steam to enter the heat dissipation pipe 2. The steam releases heat and condenses in the heat dissipation pipe 2, and is finally transferred to the medium outside the heat dissipation pipe 2 through heat conduction. After releasing the heat, the condensed liquid phase change heat transfer medium adheres to the inner wall of the heat dissipation pipe 2 and flows back to the accommodating chamber 13 under the action of gravity. The heat transfer medium in the accommodating chamber 13 always maintains a saturated isothermal state under the entire working state, thereby realizing the energy transmission process of evaporation-condensation-evaporation.

[0032] Example 2

[0033] The difference between this embodiment and embodiment 1 lies in the arrangement of the heat dissipation tubes 2. In this embodiment, based on the heat dissipation tubes 2 in embodiment 1, two rows of heat dissipation tubes 2 arranged obliquely upward are added on both sides thereof, and the heat dissipation tubes 2 are directly plugged into the connecting tubes 121 instead of being connected by the sleeves 3. The number of heat dissipation tubes 2 is increased, and the heat dissipation efficiency can be improved. Moreover, the heat dissipation tubes 2 are plugged into the connecting tubes 121, and the installation is more convenient.

[0034] Example 3

[0035] The difference between this embodiment and embodiment 1 is that in embodiment 1, two rows of heat dissipation pipes 2 arranged vertically upward are additionally provided on both sides of the heat dissipation pipe 2, thereby increasing the number of heat dissipation pipes 2, improving the heat dissipation efficiency, and providing another arrangement mode of the heat dissipation pipes 2 for construction. The heat dissipation pipes 2 are arranged vertically, which is more convenient for hoisting during construction.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum tunnel heat dissipation device, characterized in that: include: A plurality of sleeves (1) sleeved in a vacuum tunnel and a plurality of heat dissipation pipes (2) with closed top ends arranged on the outer wall of the sleeve (1), the heat dissipation pipes (2) extending obliquely upward or directly upward from the outer wall of the sleeve (1), the sleeve (1) comprising: an inner tube (11) and an outer tube (12) sleeved together at intervals, a receiving cavity (13) with closed ends formed between the inner tube (11) and the outer tube (12), a liquid phase-change heat transfer medium being arranged in the receiving cavity (13), the heat dissipation pipes (2) being arranged on the outer tube (12) and communicating with the receiving cavity (13); The outer tube (12) is provided with a connecting tube (121) communicating with the accommodating cavity (13), and the lower end of the heat dissipation tube (2) is sealedly connected to the connecting tube (121); The connecting pipe (121) is provided with a sleeve (3), and one end of the sleeve (3) away from the connecting pipe (121) is sealedly connected to the heat dissipation pipe (2); The outer wall of the outer tube (12) is provided with a heat insulation layer; The inner tube (11) and the heat dissipation tube (2) are both high thermal conductivity and corrosion-resistant tubes; The heat dissipation pipes (2) are evenly distributed on the outer wall of the outer pipe (12).

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