A gravity heat pipe capable of controlling temperature interval

Abstract

The application provides a temperature interval controllable gravity heat pipe, which comprises an evaporation section and a condensation section; the outflow end of the evaporation section is connected with the inflow end of the condensation section through a first heat insulation pipe, the outflow end of the condensation section is connected with the inflow end of the evaporation section through a second heat insulation pipe, and a liquid storage tank is arranged on the second heat insulation pipe; a low-temperature throttling valve is arranged on the first heat insulation pipe close to the inflow end of the condensation section, and a high-temperature throttling valve is arranged on the second heat insulation pipe close to the outflow end of the liquid storage tank. The low-temperature throttling valve and the high-temperature throttling valve are the same in structure and each comprises a valve body and a communication hole penetrating through the valve body; the inner wall of the valve body is recessed in a stepped manner to form a sealing step; the outer wall is fixed with the inner wall of the heat insulation pipe; the valve body of the low-temperature throttling valve is made of a negative expansion material; and the valve body of the high-temperature throttling valve is made of a thermal expansion material. According to the application, the connection state of the condensation section and the evaporation section is controlled in real time according to the internal temperature of the gravity heat pipe, precise temperature control of the gravity heat pipe is realized, and the safety performance of the gravity heat pipe is improved.

Description

Technical Field

[0001] This invention relates to the field of gravity heat pipe technology, and more specifically to a gravity heat pipe with a controllable temperature range. Background Technology

[0002] Heat pipes, as highly efficient heat transfer elements, possess advantages such as high heat transfer efficiency, uniform temperature, simple structure, and reliable operation, and are widely used in various applications, such as areas with power shortages, solar energy applications, and cryogenic medical preservation. Gravity heat pipes, as the simplest and most effective type of heat pipe, are widely used in the solar energy field. A gravity heat pipe operates in three sections: an evaporation section, an adiabatic section, and a condensation section. When the evaporation section is heated, the liquid working medium evaporates and vaporizes. The vapor moves through the adiabatic section to the condensation section, where it transfers heat to the cold source through the pipe wall. Upon encountering the cold, the vapor releases heat and condenses back into a liquid working medium. This liquid working medium then flows back to the evaporation section under gravity, thus repeatedly transferring heat in a cycle.

[0003] To achieve temperature control in gravity heat pipes, Chinese invention patent number 200780100026.1 proposes a temperature-controlled gravity heat pipe. This is achieved by installing a flow-stopping valve in the condensation section of the gravity heat pipe. This valve automatically closes when the temperature is too high, blocking the backflow of the liquid working medium and preventing a continuous rise in the temperature of the condensation section. However, this temperature-controlled gravity heat pipe can only control its operating temperature to prevent it from exceeding the rated maximum temperature; it cannot control the rated minimum operating temperature. Therefore, there is an urgent need for a gravity heat pipe with a controllable temperature range to effectively control the internal temperature of the gravity heat pipe during operation. Summary of the Invention

[0004] The present invention aims to solve the above problems and provides a gravity heat pipe with a controllable temperature range, which realizes precise control of the working temperature range of the gravity heat pipe.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A gravity heat pipe with a controllable temperature range includes an evaporation section and a condensation section;

[0007] The outlet of the evaporation section is connected to the inlet of the condensation section through a first heat insulation pipe, and the outlet of the condensation section is connected to the inlet of the evaporation section through a second heat insulation pipe. A liquid storage tank is provided on the second heat insulation pipe.

[0008] A low-temperature throttling valve is installed at the inflow end of the first insulation pipe near the condensation section, and a high-temperature throttling valve is installed at the outflow end of the second insulation pipe near the liquid storage tank.

[0009] Preferably, the low-temperature throttling valve comprises a first valve body and a first communication hole penetrating through the first valve body, the first valve body is made of negative expansion material, the inner wall is recessed in steps to form a first sealing step, and the outer wall is fixed with the inner wall of the first heat insulation pipe.

[0010] Preferably, the high-temperature throttling valve comprises a second valve body and a second communication hole penetrating through the second valve body, the second valve body is made of thermal expansion material, the inner wall is recessed in steps to form a second sealing step, and the outer wall is fixed with the inner wall of the second heat insulation pipe.

[0011] Preferably, the condensing section is provided with an exhaust valve.

[0012] Preferably, the evaporation section is connected with a pressure relief liquid storage tank through a pipeline.

[0013] The present application has the beneficial technical effects:

[0014] The present application sets a low-temperature throttling valve made of negative expansion material in the first heat insulation pipe, cooperates with a high-temperature throttling valve made of thermal expansion material in the second heat insulation pipe, controls the opening and closing of each throttling valve body according to the internal temperature of the gravity heat pipe, thereby controls the communication state of the condensing section and the evaporation section in the gravity heat pipe in real time, realizes the precise temperature control of the internal temperature of the gravity heat pipe during the working process, makes the working temperature of the gravity heat pipe always controlled in the rated working temperature range, and eliminates the safety hidden trouble caused by temperature change during the working process of the gravity heat pipe. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic view of the gravity heat pipe with controllable temperature range of the present application.

[0016] Figure 2 It is a structure schematic view of the low-temperature throttling valve of the present application in the opening state.

[0017] Figure 3 It is a structure schematic view of the low-temperature throttling valve of the present application in the closing state.

[0018] Figure 4 It is a structure schematic view of the high-temperature throttling valve of the present application in the opening state.

[0019] Figure 5 It is a structure schematic view of the high-temperature throttling valve of the present application in the closing state.

[0020] Figure 6 It is a structure schematic view of the present application when connected with a pressure relief liquid storage tank.

[0021] In the diagram: 1. Evaporation section, 2. Condensation section, 3. First insulation pipe, 4. Second insulation pipe, 5. Low temperature throttling valve, 51. First valve body, 52. First connecting hole, 53. First sealing step, 6. High temperature throttling valve, 61. Second valve body, 62. Second connecting hole, 63. Second sealing step, 7. Liquid storage tank, 8. Exhaust valve, 9. Pressure relief storage tank. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] A gravity heat pipe with a controllable temperature range, such as Figure 1 As shown, the system includes an evaporation section 1 and a condensation section 2. Evaporation section 1 heats the liquid working medium inside the gravity heat pipe, causing it to evaporate and become a gaseous working medium. Condensation section 2 facilitates heat exchange between the gaseous working medium and a cold source, causing the gaseous working medium inside the gravity heat pipe to condense and re-enter into a liquid working medium. The outlet of evaporation section 1 is connected to the inlet of condensation section 2 via a first insulating pipe 3, and the outlet of condensation section 2 is connected to the inlet of evaporation section 1 via a second insulating pipe 4. Condensation section 2 is equipped with an exhaust valve 8 to control the internal gas pressure of the gravity heat pipe; a storage tank 7 is installed on the second insulating pipe 4 to store the liquid working medium obtained after condensation in the condensation section.

[0024] A low-temperature throttling valve 5 is installed inside the first insulating pipe 3. The low-temperature throttling valve 5 is located near the inflow end of the condenser section 2 and includes a first valve body 51 and a first connecting hole 52 penetrating the first valve body 51. The first valve body 51 is made of a negative expansion material, with its inner wall having a stepped concavity forming a first sealing step 53, and its outer wall fixed to the inner wall of the first insulating pipe 3. When the internal temperature of the gravity heat pipe is within the rated temperature range, the two ends of the first connecting hole 52 inside the low-temperature throttling valve 5 are connected, and the low-temperature throttling valve 5 is in the open state. Figure 2 As shown; when the internal temperature of the gravity heat pipe is lower than the lowest temperature in the rated temperature range of the gravity heat pipe, the first valve body 51 expands radially along the first insulating pipe 3 after being cooled. After expansion, the bottom surface of the first sealing step 53 closes to form a first shielding surface, which blocks the first connecting hole 52 inside the first valve body 51, so that the low-temperature throttling valve 5 is in the closed state, as shown. Figure 3 As shown.

[0025] A high-temperature throttling valve 6 is installed inside the second heat-insulating pipe 4. The high-temperature throttling valve 6 is located near the outlet end of the liquid storage tank 7 and includes a second valve body 61 and a second connecting hole 65 penetrating the second valve body 61. The second valve body 61 is made of a thermally expanding material, with its inner wall having a stepped concavity forming a second sealing step 63, and its outer wall fixed to the inner wall of the second heat-insulating pipe 4. When the internal temperature of the gravity heat pipe is within the rated temperature range, the two ends of the second connecting hole 62 inside the high-temperature throttling valve 6 are connected, and the high-temperature throttling valve 6 is in the open state. Figure 4 As shown; when the internal temperature of the gravity heat pipe is higher than the highest temperature in the rated temperature range of the gravity heat pipe, the second valve body 61 expands radially along the second insulating pipe 4 after being heated. After expansion, the bottom surface of the second sealing step 63 closes to form a second shielding surface, which blocks the second connecting hole 62 inside the second valve body 61, so that the high-temperature throttling valve 6 is in the closed state, as shown. Figure 5 As shown.

[0026] To prevent explosion due to excessive internal pressure in the gravity heat pipe, this embodiment installs an exhaust valve 8 in the condensation section 2 of the gravity heat pipe. This valve 8 allows some gas to escape from the pipe, promptly reducing internal pressure and ensuring its stability. Alternatively, if an exhaust valve is not installed in the condensation section, the internal pressure can be reduced by connecting the evaporation section 1 of the gravity pipe to a pressure relief storage tank 9 via a pipeline. Figure 6 As shown, when the internal pressure of the gravity heat pipe is high, some of the liquid working medium inside the gravity heat pipe flows into the pressure relief storage tank 9 under high pressure and is temporarily stored in the pressure relief storage tank 9, which reduces the internal pressure of the gravity heat pipe. When the internal pressure of the gravity heat pipe returns to normal, the liquid working medium temporarily stored in the pressure relief storage tank 9 flows back into the evaporation section 1 of the gravity heat pipe through the pipeline. The pipeline connecting the pressure relief storage tank and the evaporation section of the gravity heat pipe is equipped with a capillary structure, which can prevent the saturated vapor in the evaporation section of the gravity heat pipe from flowing into the pressure relief storage tank.

[0027] The working process of the gravity heat pipe with controllable temperature range according to the present invention is as follows:

[0028] When the internal temperature of the gravity heat pipe is in the rated working temperature range, the first valve body 51 in the low-temperature throttling valve 5 and the second valve body 61 in the high-temperature throttling valve 6 are not expanded, and the first communication hole 52 and the second communication hole 62 are in a communication state. At this time, the low-temperature throttling valve 5 and the high-temperature throttling valve 6 are in an open state. The liquid working medium in the gravity heat pipe is evaporated into gaseous working medium in the evaporation section 1, and the gaseous working medium flows into the first adiabatic pipe 3, and then flows into the condensation section 5 of the gravity heat pipe through the first communication hole 52 of the low-temperature throttling valve 5. The gaseous working medium is condensed into liquid working medium again after heat exchange with the cold source in the condensation section 5, and then flows into the liquid storage tank 7 through the second adiabatic pipe 4, and then flows back to the evaporation section 1 of the gravity heat pipe through the second communication hole 62 of the high-temperature throttling valve 6, and continues to circulate in the gravity heat pipe.

[0029] When the internal temperature of the gravity heat pipe is higher than the highest temperature of the rated working temperature range, the first valve body 51 in the low-temperature throttling valve 5 is not expanded, and the first communication hole 52 is in a communication state. The second valve body 61 in the high-temperature throttling valve 6 is expanded to block the second communication hole 62. At this time, the low-temperature throttling valve 5 is in an open state, and the high-temperature throttling valve 6 is in a closed state. The gaseous working medium in the gravity heat pipe is condensed into liquid working medium again after heat exchange with the cold source in the condensation section 2, but the liquid working medium is blocked by the high-temperature throttling valve 6 due to the closed state of the high-temperature throttling valve 6 in the second adiabatic pipe 4, and can only be temporarily stored in the liquid storage tank 7, and cannot flow back to the evaporation section 1, thereby preventing the liquid working medium from flowing back to the evaporation section 1 to continue to gasify and transfer heat to the condensation section 2, thereby effectively avoiding the continuous temperature rise of the condensation section of the gravity heat pipe. When the internal temperature of the gravity heat pipe decreases to the rated working temperature range, the second valve body 61 in the high-temperature throttling valve 6 contracts to make the second communication hole 62 communicate at both ends, and the high-temperature throttling valve 6 returns to an open state. The liquid working medium temporarily stored in the liquid storage tank 7 flows out of the liquid storage tank 7, flows back to the evaporation section 1 of the gravity heat pipe through the second communication hole 62 of the high-temperature throttling valve 6, and continues to circulate in the gravity heat pipe.

[0030] When the internal temperature of the gravity heat pipe is lower than the lowest temperature of the rated working temperature range, the first valve body 51 in the low-temperature throttle valve 5 expands to block the first communication hole 52, the second valve body 61 in the high-temperature throttle valve 6 does not expand, and the second communication hole 62 is in a communication state. At this time, the low-temperature throttle valve 5 is in a closed state, the high-temperature throttle valve 6 is in an open state, the liquid working medium in the gravity heat pipe evaporates into gaseous working medium after being heated in the evaporation section 1. Since the low-temperature throttle valve 5 is in a closed state, the gaseous working medium is blocked in the evaporation section 1 of the gravity heat pipe and cannot enter the condensation section 2. The increase in the gas pressure in the evaporation section 1 leads to an increase in the temperature, thereby increasing the internal temperature of the gravity heat pipe. When the internal temperature of the gravity heat pipe increases to the rated working temperature range, the first valve body 51 in the low-temperature throttle valve 5 contracts, so that the first communication hole 52 is in communication at both ends, and the low-temperature throttle valve 5 returns to an open state. The gaseous working medium blocked in the evaporation section 1 flows back to the condensation section 2 of the gravity heat pipe through the first communication hole 52 of the low-temperature throttle valve 5, and continues to circulate in the gravity heat pipe.

[0031] Of course, the above description is not a limitation of the present application, and the present application is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the present application shall also belong to the protection scope of the present application.

Claims

1. A temperature interval controllable gravity heat pipe, characterized by, The evaporating section and the condensing section are connected by a first adiabatic pipe and a second adiabatic pipe, and the second adiabatic pipe is provided with a liquid storage tank; The first adiabatic pipe is provided with a low-temperature throttling valve near the inflow end of the condensing section, and the second adiabatic pipe is provided with a high-temperature throttling valve near the outflow end of the liquid storage tank; The low-temperature throttling valve comprises a first valve body and a first communication hole penetrating through the first valve body, the first valve body is made of a negative expansion material, the inner wall is recessed in a stepped shape to form a first sealing step, and the outer wall is fixed to the inner wall of the first adiabatic pipe; The high-temperature throttling valve comprises a second valve body and a second communication hole penetrating through the second valve body, the second valve body is made of a thermal expansion material, the inner wall is recessed in a stepped shape to form a second sealing step, and the outer wall is fixed to the inner wall of the second adiabatic pipe; The condensing section is provided with an exhaust valve; The evaporating section is connected to a pressure relief liquid storage tank by a pipe.

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