Closed heat pipe heat exchanger with automatic liquid supplement

Abstract

This invention provides an automatically replenished closed-loop heat pipe heat exchanger, belonging to the field of heat pipe heat exchangers. It includes a storage tank, an output pipeline, a solenoid valve, a heat pipe, a pressure nozzle, and a temperature switch. The storage tank is connected to one end of the heat pipe via the output pipeline, and a pressure nozzle is installed at the other end of the heat pipe. The solenoid valve is installed on the output pipeline, and the temperature switch is installed on the heat pipe, connected to the solenoid valve. A working medium is contained within the storage tank and the heat pipe. This invention can prevent the heat pipe from dry-burning when subjected to high-intensity thermal shock by discharging gaseous coolant and simultaneously replenishing liquid coolant, ensuring the heat pipe remains in good working condition without decreasing its thermal conductivity. Furthermore, it solves the problem of the heat pipe's operating angle affecting its heat transfer efficiency, allowing the heat pipe to maintain its designed thermal conductivity regardless of its operating angle through replenishment.

Description

Technical Field

[0001] This invention belongs to the field of heat pipe heat exchangers, and specifically relates to a closed heat pipe heat exchanger with automatic liquid replenishment. Background Technology

[0002] A heat exchanger is a device that transfers part of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food, and many other industrial productions. A closed-loop heat pipe heat exchanger is a common type of heat exchanger. Chinese Patent Application Publication No. CN104776739A discloses a heat pipe heat exchanger, which includes an integral heat pipe with a sealed tube body filled with a liquid working fluid. The tube body includes an evaporation section and a condensation section arranged along the direction of external fluid flow. The liquid working fluid in the evaporation section can absorb heat through the tube body and evaporate into a gaseous working fluid. The gaseous working fluid entering the condensation section can release heat through the tube body and re-condense into a liquid working fluid.

[0003] When a closed-loop heat pipe heat exchanger encounters a high-intensity heat flow, the working fluid inside will completely vaporize into a gaseous state. It will not condense into a liquid state in the condensation section and flow back to the evaporation section, resulting in dry burning of the heat pipe heat exchanger. This causes a sharp drop in the heat transfer efficiency of the heat pipe heat exchanger, leading to heat accumulation in the entire heat dissipation system, causing system failure and ultimately preventing the entire system from functioning properly. Furthermore, the operating angle of a closed-loop heat pipe heat exchanger significantly affects its heat transfer efficiency. When the condensation section is below and the evaporation section is above, its heat transfer efficiency will be greatly reduced. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing an automatically replenished closed-loop heat pipe heat exchanger. When the heat pipe is subjected to high-intensity thermal shock, it can prevent the heat pipe from dry burning by discharging gaseous coolant and simultaneously replenishing liquid coolant, thus keeping the heat pipe in a good working condition and preventing a decrease in its thermal conductivity. Furthermore, it solves the problem of the influence of the heat pipe's operating angle on its heat transfer efficiency, ensuring that the heat pipe can maintain its designed thermal conductivity regardless of its operating angle through replenishment.

[0005] The technical solution adopted in this invention is: an automatically replenished closed heat pipe heat exchanger, including a liquid storage tank, an output pipeline, a solenoid valve, a heat pipe, a pressure nozzle, and a temperature switch. The liquid storage tank is connected to one end of the heat pipe through the output pipeline, and a pressure nozzle is provided at the other end of the heat pipe. The solenoid valve is provided on the output pipeline, and a temperature switch is provided on the heat pipe. The temperature switch is connected to the solenoid valve, and a working medium is provided in the liquid storage tank and the heat pipe.

[0006] Furthermore, when the heat pipe reaches the set temperature of the temperature switch, the temperature switch controls the solenoid valve to open.

[0007] Furthermore, the solenoid valve is a normally closed solenoid valve, and the temperature switch is a normally open temperature switch.

[0008] Furthermore, the positive terminal of the power supply cable is connected to the positive terminal of the solenoid valve after passing through the temperature switch, and the negative terminal of the solenoid valve is connected to the negative terminal of the power supply cable.

[0009] Furthermore, the heat pipe is divided into an evaporation section, a transmission section, and a condensation section in sequence along its length. The output pipe is connected to the evaporation section, and the pressure nozzle and temperature switch are located on the condensation section.

[0010] Furthermore, the evaporation section is installed at the heat source, and the condensation section is installed on the radiator.

[0011] Furthermore, the liquid storage tank includes a tank body, a sealing partition, a filling port, an output port, and an air filling port. The sealing partition is slidably connected to the tank body, and the sealing partition divides the space inside the tank body into a pressure chamber and a liquid storage chamber. The pressure chamber is connected to the air filling port, the liquid storage chamber is connected to the filling port and the output port, and the output port is connected to the output pipeline.

[0012] Furthermore, the pressure chamber is equipped with compressed air, and the liquid storage chamber is equipped with the working medium.

[0013] Furthermore, the pressure of the compressed air is higher than the exhaust pressure of the pressure nozzle, and the compressed air is used to push the sealing baffle, so that the working medium in the liquid storage tank enters the heat pipe.

[0014] Furthermore, the heat pipe may be one or multiple heat pipes connected in series and / or in parallel.

[0015] Compared with the prior art, the beneficial effects of this invention are:

[0016] 1. This invention can adjust the internal pressure of the heat pipe by adjusting the opening and closing force of the pressure nozzle, thereby adjusting the heat transfer efficiency of the heat pipe and completely solving the problem of reduced heat transfer efficiency or even failure caused by the evaporation limit of the heat pipe heat exchanger under high heat flux density.

[0017] 2. This invention can solve the problem of reduced heat transfer efficiency or even failure caused by evaporation limit at any placement angle, and is not limited by the installation angle.

[0018] 3. The temperature switch of the present invention can select different trigger temperatures according to different working media in the heat pipe, and different trigger temperatures can also be selected for the same medium to adjust the amount of replenishment.

[0019] 4. The control loop of this invention is simple, has low energy consumption, high stability and high reliability, and low processing cost.

[0020] 5. This invention allows for flexible adjustment of size and heat exchange capacity through component selection. It can be implemented as a micro-system using only a single heat pipe, or as a larger system with multiple heat pipes connected in series and parallel. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0022] In the diagram: 1-Output pipeline, 2-Solenoid valve, 3-Heat pipe, 4-Pressure nozzle, 5-Temperature switch, 6-Tank body, 7-Sealing baffle, 8-Filling port, 9-Output port, 10-Air filling port, 11-Pressure chamber, 12-Liquid storage chamber, 31-Evaporation section, 32-Transmission section, 33-Condensation section. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Embodiments of the present invention provide a closed-loop heat pipe heat exchanger with automatic liquid replenishment, such as... Figure 1 As shown, it includes a liquid storage tank, an output pipeline 1, a solenoid valve 2, a heat pipe 3, a pressure nozzle 4, and a temperature switch 5.

[0025] The storage tank includes a tank body 6, a sealing partition 7, a filling port 8, an outlet port 9, and an air filling port 10. The sealing partition 7, slidably connected to the tank body 6, divides the space within the tank body 6 into a pressure chamber 11 and a storage chamber 12. The pressure chamber 11 is connected to the air filling port 10, and the storage chamber 12 is connected to the filling port 8 and the outlet port 9. Compressed air is contained in the pressure chamber 11, and a liquid working medium is contained in the storage chamber 12. The sealing partition 7 can slide within the tank body 6, thereby changing the volume of the pressure chamber 11 and the storage chamber 12.

[0026] The heat pipe 3 contains a working medium. The heat pipe 3 is divided into an evaporation section 31, a transmission section 32, and a condensation section 33 along its length. The output port 9 is connected to the evaporation section 31 of the heat pipe 3 via an output pipe 1. A solenoid valve 2 is installed on the output pipe 1. A pressure nozzle 4 and a temperature switch 5 are located on the condensation section 33. The pressure nozzle 4 is located at the end of the condensation section 33, and the temperature switch 5 is attached to the condensation section 33 and close to its end.

[0027] The positive terminal of the power supply cable is connected to the positive terminal of the solenoid valve 2 via the temperature switch 5, and the negative terminal of the solenoid valve 2 is connected to the negative terminal of the power supply cable. The solenoid valve 2 is a normally closed solenoid valve used to control the opening and closing state of the output pipeline 1, and its operation is controlled by feedback from the temperature switch 5. The temperature switch 5 is a normally open temperature switch. When the surface temperature of the condensation section 33 reaches the set temperature of the temperature switch 5, the temperature switch 5 controls the solenoid valve 2 to open, connecting the liquid storage chamber 12 to the heat pipe 3. The compressed air in the pressure chamber 11 pushes the sealing partition 7 to move, allowing the working medium in the liquid storage chamber 12 to enter the heat pipe 3. The pressure value of the compressed air is higher than the exhaust pressure value of the pressure nozzle 4, and naturally also higher than the pressure value of the working medium in the heat pipe 3.

[0028] In this embodiment, only one heat pipe 3 is used. If multiple heat pipes 3 are connected in series, the output pipe 1 can be connected to the evaporation section 31 of the first heat pipe 3, and the pressure nozzle 4 can be installed in the condensation section 33 of the last heat pipe 3. If multiple heat pipes 3 are connected in parallel, the tank 6 can be connected to the evaporation sections 31 of multiple heat pipes 3 through the output pipe 1, and each heat pipe 3 is equipped with a solenoid valve 2.

[0029] During installation, the evaporation section 31 of the heat pipe 3 is installed at the heat source, and the condensation section 33 is installed on the radiator. The evaporation section 31 is connected to the heat source. After absorbing heat, the liquid working medium inside it vaporizes and absorbs heat and generates pressure. After passing through the transmission section 32, it reaches the condensation section 33, where it liquefies and releases heat. The heat is then dissipated through the radiator.

[0030] When heat pipe 3 is used under conditions of low heat flux density, the opening pressure of pressure nozzle 4 is greater than the internal vapor pressure of heat pipe 3, and the nozzle is in the closed state. Heat pipe 3 is in a sealed state, and its application is no different from that of a regular heat pipe. When heat pipe 3 is used under conditions of high heat flux density, the opening pressure of pressure nozzle 4 is less than the internal vapor pressure of heat pipe 3, pressure nozzle 4 is opened, high-pressure vapor is released, the pressure decreases, and pressure nozzle 4 closes.

[0031] Temperature switch 5 is attached to condenser section 33. When the temperature of condenser section 33 reaches the set temperature, temperature switch 5 closes, the circuit of solenoid valve 2 is connected, solenoid valve 2 opens, and the high-pressure air in the liquid storage tank pushes the sealing baffle 7 to deliver the working medium in the liquid storage chamber 12 to the evaporation section 31 of heat pipe 3 through the delivery pipeline. When the temperature of condenser section 33 is lower than the set temperature, temperature switch 5 opens, solenoid valve 2 closes, and heat pipe 3 returns to a sealed state.

[0032] When the working medium in the storage tank is insufficient, it can be added through the filling port 8 to replenish the working medium. When the air pressure in the storage tank is insufficient, air can be added through the air filling port 10 to restore the pressure.

[0033] The present invention has been described in detail above through embodiments, but the content described is only an exemplary embodiment of the present invention and should not be considered as limiting the scope of the present invention. The scope of protection of the present invention is defined by the claims. Any technical solutions designed by those skilled in the art using the technical solutions described in the present invention, or designed by those skilled in the art under the inspiration of the technical solutions of the present invention, within the substance and protection scope of the present invention, to achieve the above-mentioned technical effects, or any equivalent changes and improvements made to the scope of the application, should still fall within the patent protection scope of the present invention.

Claims

1. A closed-loop heat pipe heat exchanger with automatic liquid replenishment, characterized in that, The device includes a storage tank, an output pipeline, a solenoid valve, a heat pipe, a pressure nozzle, and a temperature switch. The storage tank is connected to one end of the heat pipe through the output pipeline. A pressure nozzle is installed at the other end of the heat pipe. A solenoid valve is installed on the output pipeline. A temperature switch is installed on the heat pipe and connected to the solenoid valve. A working medium is installed inside the storage tank and the heat pipe. The liquid storage tank includes a tank body, a sealing partition, a filling port, an output port, and an air filling port. The sealing partition is slidably connected to the tank body, and the sealing partition divides the space inside the tank body into a pressure chamber and a liquid storage chamber. The pressure chamber is connected to the air filling port, the liquid storage chamber is connected to the filling port and the output port, and the output port is connected to the output pipeline.

2. The automatically replenished closed-loop heat pipe heat exchanger as described in claim 1, characterized in that, When the heat pipe reaches the set temperature of the temperature switch, the temperature switch controls the solenoid valve to open.

3. The automatically replenished closed-loop heat pipe heat exchanger as described in claim 1 or 2, characterized in that, The solenoid valve is a normally closed solenoid valve, and the temperature switch is a normally open temperature switch.

4. The automatically replenished closed-loop heat pipe heat exchanger as described in claim 3, characterized in that, The positive terminal of the power supply cable is connected to the positive terminal of the solenoid valve after passing through the temperature switch, and the negative terminal of the solenoid valve is connected to the negative terminal of the power supply cable.

5. The automatically replenished closed-loop heat pipe heat exchanger as described in claim 1, characterized in that, The heat pipe is divided into an evaporation section, a transmission section and a condensation section in sequence along its length. The output pipe is connected to the evaporation section, and the pressure nozzle and temperature switch are located on the condensation section.

6. The automatically replenished closed-loop heat pipe heat exchanger as described in claim 5, characterized in that, The evaporation section is installed at the heat source, and the condensation section is installed on the radiator.

7. The automatically replenished closed-loop heat pipe heat exchanger as described in claim 1, characterized in that, The pressure chamber is equipped with compressed air, and the liquid storage chamber is equipped with the working medium.

8. The automatically replenished closed-loop heat pipe heat exchanger as described in claim 7, characterized in that, The pressure of the compressed air is higher than the exhaust pressure of the pressure nozzle. The compressed air is used to push the sealing baffle, allowing the working medium in the liquid storage tank to enter the heat pipe.

9. The automatically replenished closed-loop heat pipe heat exchanger as described in claim 1, characterized in that, The heat pipe may be one or multiple heat pipes connected in series and / or in parallel.

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