Freeze-thaw resistant roadbed heat pipe device capable of pneumatically strengthening heat dissipation

Abstract

The utility model discloses a pneumatic enhanced heat dissipation freeze-thaw resistant roadbed heat pipe device which comprises a heat pipe body filled with a heat exchange working medium, the lower portion of the heat pipe body is used for being placed in a roadbed frozen soil layer, and the upper portion of the heat pipe body is provided with heat dissipation fins and exposed in the air for heat dissipation. The pipe body temperature control assembly is arranged on the upper portion of the heat pipe body and used for dynamically adjusting the heat transfer direction and strength, the air pump refrigeration assembly is communicated with the pipe body temperature control assembly through a pipeline to form heat exchange circulation, and the power supply assembly is electrically connected with the air pump refrigeration assembly. The pipe body temperature control assembly is used for carrying out forced temperature control on the heat release section on the upper portion of the heat pipe body, so that the heat pipe can still work and operate in the relative change process of the environment temperature, heat migration in a frozen soil roadbed is released or blocked, and the air pump refrigeration assembly is arranged to release absorbed heat into air, so that the heat transfer efficiency is improved. Meanwhile, electricity is provided for the device in a photovoltaic, wind power or wind-solar complementary mode, natural resources in the using environment are fully utilized, and the whole device based on natural force can dynamically and efficiently operate at low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of roadbed heat pipes, in particular to a freeze-thaw resistant roadbed heat pipe device with pneumatic enhanced heat dissipation. Background Art

[0002] Permafrost refers to land that remains frozen for three years or more under natural conditions, and is primarily distributed in cold regions at high latitudes or altitudes. Unlike roadbed engineering in conventional areas, the engineering properties of roadbed soil and its underlying soil layer in permafrost areas primarily depend on the solid-liquid phase transformation process of water in the soil caused by alternating positive and negative temperatures and fluctuations. Therefore, the impact of temperature on the stability of frozen soil roadbeds is crucial, and thermal stability in frozen soil roadbeds is the key to roadbed stability. The engineering geological problems caused by the destruction of thermal stability of frozen soil roadbeds include: thermal thaw subsidence caused by a decrease in the upper limit; changes in roadbed stability caused by changes in the strength and rheological properties of permafrost foundation soil; roadbed diseases caused by adverse frozen soil phenomena (such as ice cones and frost heaves); and uneven frost heave diseases caused by the freezing and thawing of the active layer.

[0003] A roadbed heat pipe, also known as a heat rod, is a highly efficient heat-conducting device made of seamless carbon steel pipe. The lower portion (heat-absorbing section) is buried directly in permafrost, while the upper portion (heat-releasing section) is exposed and equipped with fins. The interior is filled with a low-boiling-point liquid heat exchange medium. When the ambient temperature is lower than the permafrost surrounding the heat rod's heat-absorbing section, the liquid in the heat rod absorbs heat from the permafrost and evaporates into vapor. Driven by the pressure differential within the pipe, the vapor flows upward along the central channel of the heat rod to the upper portion. Upon encountering the cooler pipe wall, it releases its latent heat of vaporization and condenses into liquid. Under the influence of gravity, it flows back along the pipe wall to the heat-absorbing section, where it evaporates again. This repetitive cycle dissipates heat from the permafrost in the foundation to the atmosphere. Due to the heat rod's one-way heat transfer, it stores a large amount of cold in the permafrost in winter, preventing it from melting in summer and forming a "permafrost layer." This strengthens the permafrost and effectively prevents frost heave and thaw settlement during operation of railways and highways built on permafrost.

[0004] The heat release section of existing heat pipes primarily utilizes ambient temperature for heat dissipation, and therefore typically operates in winter but not in summer. However, due to relatively high ambient temperatures and strong thermal radiation in summer, frozen roadbeds can also thaw to some extent, leading to thaw settlement. Improving the freeze-thaw resistance of frozen roadbeds is a key issue currently facing roadbed heat pipes. Utility Model Content

[0005] In response to the problems existing in the above-mentioned prior art, the utility model provides an anti-freeze-thaw roadbed heat pipe device with pneumatic enhanced heat dissipation. By adding a forced temperature control structure based on the air pump refrigeration principle to the traditional heat pipe, the heat dissipation effect of the heat pipe heat release section is improved, thereby improving the working efficiency of the heat pipe and enhancing the anti-freeze-thaw effect.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] A freeze-thaw-resistant roadbed heat pipe device with pneumatically enhanced heat dissipation includes a heat pipe body with a heat exchange medium inside, the lower part of the heat pipe body is used to be placed in the roadbed frozen soil layer, and the upper part is provided with heat dissipation fins and exposed to the air for heat dissipation. It also includes a pipe body temperature control component arranged on the upper part of the heat pipe body for dynamically adjusting the direction and intensity of heat transfer, an air pump refrigeration component connected to the pipe body temperature control component through a pipeline to form a heat exchange cycle, and a power supply component electrically connected to the air pump refrigeration component.

[0008] Preferably, the power supply component uses a photovoltaic system, a wind turbine or a wind-solar complementary system to provide power to the air pump refrigeration component.

[0009] Preferably, the pipe body temperature control component is configured as a longitudinal spiral coil, the coil is wound around the upper part of the heat pipe body, and the two ends of the coil are respectively connected to the output end and the return end of the air pump refrigeration component.

[0010] Preferably, the coil is internally filled with a coolant that circulates with the air pump refrigeration component.

[0011] Preferably, the coil is in contact with heat dissipation fins.

[0012] Specifically, the air pump refrigeration component includes a condenser, an expansion valve, an evaporator and an air pump compressor connected in sequence to form a refrigeration cycle, wherein the condenser is equipped with an output end and a return end, and forms a heat exchange cycle with the pipe body temperature control component through pipelines.

[0013] Furthermore, the tube body temperature control assembly is configured in multiples corresponding to different heat pipe bodies, and all the tube body temperature control assemblies are connected to the air pump refrigeration assembly to form a heat exchange cycle.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The present invention is based on the structural improvement of the traditional roadbed heat pipe, and uses the pipe body temperature control component to dynamically control the heat transfer process of the heat release section on the upper part of the heat pipe body, so that the heat pipe can still work and operate during the relative change of the ambient temperature, release or block the heat migration in the frozen soil roadbed, and configure an air pump refrigeration component to release the absorbed heat into the air to ensure the normal operation of the entire device. At the same time, photovoltaic, wind power or wind-solar complementary methods are used to provide electricity for the device, making full use of the natural resources in the use environment, and realizing the low-cost dynamic and efficient operation of the entire device based on natural forces. The present invention is cleverly designed, relatively simple in structure, easy to use, effective, low-cost, and suitable for application in roadbed heat pipes.

[0016] (2) The temperature control assembly of the heat pipe body of the present invention adopts a longitudinal spiral coil structure, which can fully contact with the heat pipe wall for cooling, and can also contact with the heat dissipation fins to enhance heat dissipation, thereby promoting the heat dissipation efficiency of the upper heat release section of the heat pipe body as a whole, thereby improving the working efficiency of the heat pipe body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the coil in the embodiment of the present invention.

[0019] Figure 3 This is a schematic structural diagram of the air pump refrigeration assembly in an embodiment of the present utility model.

[0020] Figure 4 This is a structural diagram of the configuration of multiple tube temperature control components in an embodiment of the present utility model. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings and examples. The implementation methods of the present invention include but are not limited to the following examples.

[0022] Example

[0023] like Figures 1 to 3As shown, the pneumatically enhanced heat dissipation anti-freeze-thaw roadbed heat pipe device includes a heat pipe body 1 with a heat exchange medium inside, the lower part of the heat pipe body is used to be placed in the roadbed frozen soil layer, and the upper part is provided with heat dissipation fins 2 and exposed to the air for heat dissipation. It also includes a pipe body temperature control component 11 arranged on the upper part of the heat pipe body for dynamically adjusting the direction and intensity of heat transfer, an air pump refrigeration component 12 connected to the pipe body temperature control component through a pipeline to form a heat exchange cycle, and a power supply component electrically connected to the air pump refrigeration component. In this embodiment, the power supply component preferably uses a wind-solar complementary system to provide power for the air pump refrigeration component, wherein the wind-solar complementary system is combined with a photovoltaic system 13 and a wind turbine 14, with the photovoltaic system using solar power to generate electricity and the wind turbine using wind power to generate electricity, and jointly provide power to ensure the normal operation of the air pump refrigeration component. In permafrost areas, natural resources such as sunlight and wind resources are abundant and can meet the power supply needs of the device.

[0024] Specifically, the tube body temperature control component is configured as a longitudinal spiral coil, and the coil is built with a coolant that circulates with the air pump refrigeration component to improve the heat exchange efficiency of the coil; the coil is wound around the upper part of the heat pipe body to fully contact the heat pipe wall for heat exchange and cooling, and the coil can also contact the heat dissipation fins to enhance the heat dissipation effect of the heat dissipation fins. The two ends of the coil are respectively connected to the output end and the return end of the air pump refrigeration component, thereby forming a heat exchange cycle. Furthermore, the tube body temperature control component can also be configured with an electric heating component, which increases the temperature of the heat release section on the upper part of the heat pipe body by means of a controllable heating resistor wire, thereby blocking or slowing down the heat transfer in the heat pipe body, and then dynamically regulating the heat transfer intensity on the heat pipe body, thereby achieving more flexible dynamic regulation of the tube body temperature.

[0025] Specifically, the air pump refrigeration assembly includes a condenser 21, an expansion valve 22, an evaporator 23, and an air pump compressor 24, which are connected in sequence to form a refrigeration cycle. The condenser is equipped with an output end 25 and a return end 26, and forms a heat exchange cycle with the pipe body temperature control assembly through a pipeline. During operation, the refrigerant in the refrigeration cycle exchanges heat with the coolant from the pipe body temperature control assembly in the condenser. The refrigerant that has absorbed heat is compressed by the air pump compressor and enters the evaporator, where it exchanges heat with the air to dissipate heat, releasing heat. It then enters the condenser after being throttled by the expansion valve. At this time, the refrigerant temperature is lower than the temperature of the return coolant, and it can exchange heat and absorb the heat of the coolant to achieve cooling of the coolant, thus completing a refrigeration cycle. The cooled coolant enters the pipe body temperature control assembly through a pipeline to exchange heat with the heat pipe wall, thereby absorbing the heat emitted by the heat release section of the heat pipe. The coolant that has absorbed heat then returns to the condenser through the return end, thus completing a heat exchange cycle. The above two cycles can continuously release the heat in the heat pipe body into the air, thereby improving the anti-freeze and thaw effect of the heat pipe.

[0026] like Figure 4As shown, in order to further reduce the cost of the device, a multiple-to-one structure of the tube body temperature control component 11 and the air pump refrigeration component 12 can be adopted. After the tube body temperature control components are respectively configured on different heat pipe bodies, all the tube body temperature control components are connected to the air pump refrigeration components through pipelines to form a heat exchange cycle, so that one set of air pump refrigeration components supports multiple sets of road-based heat pipes, thereby maximizing the utilization of heat exchange efficiency.

[0027] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any changes based on the design principles of the present invention and any changes made through non-creative work on this basis shall fall within the scope of protection of the present invention.

Claims

1. A pneumatically enhanced heat dissipation anti-freeze-thaw roadbed heat pipe device, comprising a heat pipe body containing a heat exchange medium, the lower portion of the heat pipe body being placed in the frozen soil layer of the roadbed, and the upper portion being provided with heat dissipation fins and exposed to the air for heat dissipation, characterized in that: It also includes a pipe temperature control component arranged on the upper part of the heat pipe body for dynamically adjusting the direction and intensity of heat transfer, an air pump refrigeration component connected to the pipe temperature control component through a pipeline to form a heat exchange cycle, and a power supply component electrically connected to the air pump refrigeration component.

2. The anti-freeze-thaw roadbed heat pipe device with pneumatic enhanced heat dissipation according to claim 1 is characterized in that: The power supply component uses a photovoltaic system, a wind turbine or a wind-solar complementary system to provide power to the air pump refrigeration component.

3. The anti-freeze-thaw roadbed heat pipe device with pneumatic enhanced heat dissipation according to claim 1 is characterized in that: The pipe body temperature control component is configured as a longitudinal spiral coil, which is wound around the upper part of the heat pipe body. The two ends of the coil are respectively connected to the output end and the return end of the air pump refrigeration component.

4. The anti-freeze-thaw roadbed heat pipe device with pneumatic enhanced heat dissipation according to claim 3 is characterized in that: The coil contains a cooling liquid that circulates with the air pump refrigeration component.

5. The anti-freeze-thaw roadbed heat pipe device with pneumatic enhanced heat dissipation according to claim 3 is characterized in that: The coil is in contact with the heat dissipation fins.

6. The anti-freeze-thaw roadbed heat pipe device with pneumatic enhanced heat dissipation according to any one of claims 1 to 5, characterized in that: The air pump refrigeration component includes a condenser, an expansion valve, an evaporator and an air pump compressor which are connected in sequence to form a refrigeration cycle, wherein the condenser is equipped with an output end and a return end, and forms a heat exchange cycle with the pipe body temperature control component through a pipeline.

7. The anti-freeze-thaw roadbed heat pipe device with pneumatic enhanced heat dissipation according to claim 6 is characterized in that: The tube body temperature control components are configured in multiples corresponding to different heat pipe bodies, and all the tube body temperature control components are connected to the air pump refrigeration component to form a heat exchange cycle.

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