CN211823994U - Heat pipe for controlling auxiliary phase change in segmented mode - Google Patents

Abstract

The utility model discloses a subsection-controlled auxiliary phase-change heat pipe, which comprises a tube shell with a closed cavity formed inside, the tube shell includes an evaporation section and a condensation section, and a liquid absorption core and a heat transfer medium are arranged in the closed cavity. The liquid absorbing cores located in the evaporation section and the condensing section are respectively provided with a plurality of semiconductor refrigerating sheets, and both ends of the semiconductor refrigerating sheets are respectively arranged in the liquid absorbing core and the closed cavity. By arranging semiconductor refrigerating sheets in the evaporation section and the condensing section of the utility model, when the working temperature of the heat pipe is not within the nominal working temperature range, and the heat transfer medium cannot undergo phase change or the phase change is incomplete, the corresponding semiconductor refrigerating sheet is controlled to work to ensure that The heat transfer medium undergoes an evaporation phase change in the evaporation section of the heat pipe and a condensation phase change in the condensation section to ensure that the heat transfer medium in the heat pipe can achieve a phase change in the entire working temperature range, so as to maintain continuous and efficient heat transfer and make the heat pipe The critical heat flux density is increased.

Description

A heat pipe for subsection control of auxiliary phase transition

technical field

The utility model belongs to the technical field of heat exchange devices, and in particular relates to a heat pipe for subsection control auxiliary phase change.

Background technique

A general heat pipe consists of a tube shell, a wick and an end cap. The inside of the heat pipe is pumped into a negative pressure state and filled with an appropriate liquid. This liquid has a low boiling point and is easy to volatilize. The tube wall has a wick, which is composed of capillary porous material. One end of the heat pipe is the evaporation section, and the other end is the condensation section. When one end of the heat pipe is heated, the liquid in the capillary is rapidly vaporized, and the vapor flows to the other end under the power of thermal diffusion, and condenses at the cold end to release heat, and the liquid flows along the porous material. It flows back to the evaporation section by capillary action, and the cycle continues until the temperature at both ends of the heat pipe is equal (at this time, the thermal diffusion of steam stops).

From the point of view of thermodynamics, why do heat pipes have such good thermal conductivity? The heat absorption and heat release of objects are relative. Whenever there is a temperature difference, the phenomenon of heat transfer from high temperature to low temperature will inevitably occur. From the three ways of heat transfer (radiation, convection, conduction), convection conduction is the fastest. The heat pipe is a phase change process in which the medium is evaporated at the hot end and then condensed at the cold end (that is, using the latent heat of evaporation and condensation of the liquid) to conduct heat quickly.

Therefore, how to provide a heat pipe that can keep the phase transition of the medium inside the heat pipe within the working temperature range is the key to the efficient heat transfer of the heat pipe.

Utility model content

Purpose of the utility model: Aiming at the deficiencies of the prior art, the purpose of the present utility model is to provide a heat pipe with subsection-controlled auxiliary phase change, which can ensure that the heat transfer medium in the heat pipe can achieve phase change in the entire working temperature range, Thereby maintaining continuous and efficient heat transfer.

Technical scheme: In order to achieve the purpose of the above utility model, the technical scheme adopted by the utility model is as follows: a heat pipe for subsection control of auxiliary phase change, comprising a tube shell with a closed cavity formed inside, and the tube shell includes an evaporation section and a condensation section. The closed cavity is provided with a liquid absorbing core and a heat transfer medium, and the liquid absorbing cores located in the evaporation section and the condensation section are respectively provided with a number of semiconductor refrigerating sheets, and both ends of the semiconductor refrigerating sheets are respectively arranged on the suction wicks. In the liquid core and the closed cavity, when the temperature outside the evaporation section and/or the condensation section is not enough to cause the evaporation phase change and condensation phase change of the heat transfer medium inside, respectively, control the corresponding semiconductor refrigeration sheet to energize and work, In order to keep the heat transfer medium in the evaporation section and the condensation section within the nominal working range.

Further, the cross section of the tube shell is circular or rectangular.

Further, the liquid-absorbing core is arranged in close contact with the inner wall of the tube shell.

Further, the tube shell is provided with a liquid injection port communicating with the closed cavity.

Further, the heat transfer medium includes ammonia, ethanol, freon and water.

Further, the tube shell further includes an adiabatic section disposed between the evaporation section and the condensation section.

Beneficial effects: Compared with the prior art, the present utility model has the following advantages: the present utility model, by arranging semiconductor refrigerating sheets in the evaporation section and the condensing section, when the working temperature of the heat pipe is not within the nominal working temperature range, the heat transfer medium cannot be phased. When the phase change or phase change is incomplete, control the corresponding semiconductor refrigeration sheet to work to ensure that the heat transfer medium undergoes an evaporation phase change in the evaporation section of the heat pipe and a condensation phase change in the condensation section to ensure that the heat transfer medium in the heat pipe is within the entire working temperature range. Phase change can be achieved, so as to maintain continuous and efficient heat transfer, so that the critical heat flux density of the heat pipe is improved.

Description of drawings

Fig. 1 is the structural schematic diagram of the heat pipe of the subsection control auxiliary phase change of the embodiment of the present invention;

FIG. 2 is a schematic view of the cross-sectional structure taken along the line A-A in FIG. 1 .

Detailed ways

Below in conjunction with specific embodiments, the present utility model is further clarified. The embodiments are implemented on the premise of the technical solutions of the present utility model. It should be understood that these embodiments are only used to illustrate the present utility model and are not intended to limit the scope of the present utility model.

As shown in FIGS. 1 and 2 , the heat pipe of the subsection control auxiliary phase transition of the present application includes a tube shell 1 with a closed cavity 3 inside and a liquid absorbing wick 4 arranged in the tube shell 1 , and also includes a certain The heat transfer medium pressure-filled in the closed cavity 3 also includes a number of semiconductor refrigeration sheets 5 .

Specifically, the tube shell 1 is a closed hollow shell, and its cross-section can be circular, rectangular or other shapes. The tube shell 1 may also be provided with a liquid injection port communicating with the cavity, through which the cavity is evacuated and a heat transfer medium is injected. The closed cavity 3 has a certain degree of vacuum, and the degree of vacuum can be determined according to the type and boiling point temperature of the heat transfer medium actually required. The heat transfer medium can be ammonia, ethanol, freon (R21, R22, R113, etc.) or water, and the boiling point temperature can be determined according to the nominal working temperature of the heat pipe, and the type of heat transfer medium can be determined accordingly. The absorbent core 4 is preferably arranged in close contact with the inner wall of the tube shell 1 . Usually the heat transfer medium absorbs heat and evaporates at one end of the tube shell 1, and then releases heat and condenses at the other end. 6. An adiabatic section 7 can be arranged between the evaporation section 2 and the condensation section 6 as required. The heat transfer medium condensed into liquid in the condensation section 6 flows back from the liquid wick 4 to the evaporation section 2 under capillary action. A plurality of semiconductor refrigeration sheets 5 are respectively arranged on the liquid absorbing core 4 in the evaporation section 2 and the condensation section 6 , and both ends of the semiconductor refrigeration sheet 5 are respectively arranged in the liquid absorbing core 4 and the closed cavity 3 .

During use, a temperature sensor is set on the outside of the evaporation section 2 and the condensation section 6 to measure the temperature outside the evaporation section 2 and the condensation section 6 respectively. When the temperature outside the evaporation section 2 and/or the condensation section 6 is not enough When the evaporative phase change and condensation phase change of the heat transfer medium occur, the semiconductor refrigeration sheet 5 is energized to work, so that the heat transfer medium in the evaporation section 2 and the condensation section 6 are kept within the nominal working range. Specifically, when the temperature sensor provided outside the evaporation section 2 detects that the temperature is insufficient to cause the heat transfer medium to undergo an evaporation phase change, the semiconductor refrigeration sheet 5 in the evaporation section 2 is energized to work, and the semiconductor refrigeration sheet 5 is located inside the liquid absorbing core 4. The temperature of the end increases and becomes the hot end, the temperature of the end of the semiconductor refrigerating sheet 5 located in the closed cavity 3 decreases and becomes the cold end, the heat of which is heated by the hot end to heat the heat transfer medium in the liquid absorbing core 4, and the heat transfer medium in the liquid absorbing core 4 is heated by the hot end, and the temperature of the end of the semiconductor refrigerating sheet 5 in the closed cavity 3 decreases and becomes the cold end. The heat absorbed by the evaporation section 2 of the heat pipe from the outside heats the heat transfer medium together, so that the heat transfer medium evaporates and absorbs heat (latent heat) in the liquid wick 4 and vaporizes (vapor phase), and the generated steam is driven by the steam pressure difference and flows to the heat pipe. At the same time, when the temperature sensor set in the condensation section 6 of the heat pipe detects that the temperature of the heat transfer medium is insufficient to cause a condensation phase change of the heat transfer medium, a reverse current is applied to the semiconductor refrigeration sheet 5 in the condensation section 6 , the temperature of the end of the semiconductor refrigeration sheet 5 located inside the liquid absorbing core 4 decreases and becomes the cold end, and the temperature of the end of the semiconductor refrigeration sheet 5 located in the closed cavity 3 increases and becomes the hot end, and the cold end of the semiconductor refrigeration sheet 5 The end absorbs the heat of the heat transfer medium in the liquid absorbent core 4 together with the external medium of the heat pipe, strengthens the heat transfer medium vapor to release latent heat in the liquid absorbent core 4, that is, condenses back to a liquid phase, and then drives the liquid absorbent core 4 by capillary force. Return to the evaporation section 2, so that the heat transfer medium in the heat pipe can achieve a phase change in the entire working temperature range.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and Retouching should also be regarded as the protection scope of the present invention.

Claims (6)

1. A heat pipe for subsection-controlled auxiliary phase transition, comprising a tube shell with a closed cavity formed inside, the tube shell including an evaporation section and a condensation section, and a liquid absorbing wick and a heat transfer medium are arranged in the closed cavity , which is characterized in that: the liquid absorbing core located in the evaporation section and the condensation section are respectively provided with a number of semiconductor refrigeration sheets, and the two ends of the semiconductor refrigeration sheets are respectively arranged in the liquid absorbing core and the closed cavity. And/or the temperature outside the condensation section is not enough to cause the evaporation phase change and condensation phase change of the heat transfer medium inside, respectively, control the corresponding semiconductor refrigeration sheet to energize and work, so as to make the heat transfer in the evaporation section and the condensation section. The media are kept within the nominal operating range. 2 . The heat pipe for segmented control auxiliary phase transition according to claim 1 , wherein the cross section of the tube shell is circular or rectangular. 3 . 3 . The heat pipe for subsection control and auxiliary phase transition according to claim 1 , wherein the liquid absorbing core is arranged in close contact with the inner wall of the tube shell. 4 . 4 . The heat pipe for subsection-controlled auxiliary phase transition according to claim 1 , wherein the tube shell is provided with a liquid injection port that communicates with the closed cavity. 5 . 5 . The heat pipe for staged control auxiliary phase transition according to claim 1 , wherein the heat transfer medium comprises ammonia, ethanol, freon or water. 6 . 6 . The heat pipe with staged control auxiliary phase change according to claim 1 , wherein the tube shell further comprises an adiabatic section arranged between the evaporation section and the condensation section. 7 .

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