A two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches and its control method

Abstract

The present invention discloses a two-phase cooling cycle with adaptive flow distribution among multiple evaporator branches and a control method thereof. The cycle primarily comprises multiple evaporators, condensers, liquid reservoirs, liquid pumps, and connecting piping connected in parallel. A vent and liquid-blocking valve is installed at the outlet of each branch evaporator. The vent and liquid-blocking valve, primarily composed of a valve seat, a valve core, and a float, automatically adjusts its valve opening based on the dryness of the inlet working fluid under the influence of gravity and buoyancy. The valve opening widens with increasing dryness. When the thermal loads of the branches are asynchronous, the circulation flow can be adaptively distributed as needed: The greater the branch thermal load, the higher the corresponding working fluid dryness, the lower the vent and liquid-blocking valve resistance, and the greater the branch flow. The lower the branch thermal load, the lower the corresponding working fluid dryness, the higher the vent and liquid-blocking valve resistance, and the lower the branch flow. This not only addresses the problem of low flow and overheating in high-load branches, which can easily lead to burnout, but also effectively reduces ineffective flow in low-load branches, significantly saving liquid pump energy.

Description

Technical Field

[0001] The present invention relates to a two-phase cooling cycle with adaptive flow distribution of multiple evaporator branches and a control method thereof, which is suitable for heat dissipation of high heat flux density equipment and belongs to the field of engineering thermophysics. Background Art

[0002] With the rapid development of high-frequency, integrated, and high-power electronic devices, the heat generation and heat flux density of these devices are gradually increasing. Traditional single-phase cooling technologies based on air and water cooling are unable to meet these requirements. Two-phase thermosiphon cycles (split heat pipe cycles) based on phase change heat transfer have gained widespread application due to their high heat transfer efficiency, good isothermal properties, and flexible layout. To address the problem of insufficient liquid return capacity due to insufficient height difference and high resistance, pump-driven two-phase cooling cycles have been further developed, significantly improving the return capacity and reliability of the cycle. Currently, gravity-driven / liquid pump-driven two-phase cooling cycles have become a promising technical solution for thermal management of electronic devices.

[0003] Thermal management of electronic devices sometimes requires simultaneous cooling of multiple electronic devices. Therefore, a two-phase cooling cycle requires multiple evaporators operating in parallel. The pipe diameters and impedances of each evaporator branch are typically equal to ensure equal circulation flow rates in each branch when the electronic devices operate synchronously (equal heating values). However, due to the random and asynchronous heating values ​​of each electronic device, it is often difficult to match the circulation flow rates of each branch. Furthermore, the higher the heating value of a branch, the greater the dryness and flow resistance within the evaporator, resulting in a decrease in the circulation flow rate in that branch, which can easily lead to overheating and damage to the electronic equipment. For example, three sets of evaporators are connected in parallel to cool three electronic devices (1#, 2#, and 3#). The heat output of 1#, 2#, and 3# electronic devices is 1000W, 500W, and 0W respectively. The branch dryness x of the larger the heat output is, the greater the resistance is, and the smaller the circulation flow is. The flow rates of 1#, 2#, and 3# evaporators are 3kg / h, 8kg / h, and 20kg / h respectively. As a result, 1# evaporator overheats and burns due to insufficient flow, while 3# evaporator does not bear the heat load but bypasses most of the flow. Figure 1 As shown. In a pump-driven two-phase circulation, to prevent a branch from drying out and overheating, the only option is to increase the total circulation flow rate through a liquid pump. However, most of the flow rate does not participate in the phase change and becomes "ineffective flow," resulting in significant energy waste. Furthermore, the two-phase cooling system provides heat dissipation for electronic equipment, but cannot predict or measure the heat generated by the electronic equipment in real time. Therefore, there is an urgent need to develop a two-phase cooling cycle that achieves adaptive flow distribution without requiring real-time heat generation measurement. This would enable adaptive flow distribution to each branch based on the working fluid state (such as dryness), thereby ensuring that each branch does not overheat and dry out while also saving liquid pump energy. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention proposes a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches and its control method. The working fluid flow is adaptively distributed on demand through a ventilation and liquid-blocking valve. This not only solves the problem of overheating and burning caused by small flow in high-heat-generating branches, but also effectively reduces the invalid flow in low-heat-generating branches, thereby greatly saving liquid pump energy consumption.

[0005] The present invention adopts the following technical solutions:

[0006] A two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches comprises multiple parallel evaporator branches and condensers (4) and liquid reservoirs (5) connected to the evaporator branches in sequence through pipelines. The evaporator branches, condensers (4) and liquid reservoirs (5) form a closed loop, and the loop is filled with a phase-changing working medium. The evaporator branches comprise an evaporator (1) and a venting and liquid-blocking valve (3). The venting and liquid-blocking valve (3) is arranged at the outlet of the evaporator (1) and is positioned higher than the evaporator (1). The evaporator (1) is tightly fitted with an electronic device (2) to cool the electronic device (2).

[0007] The venting and liquid-blocking valve (3) can adaptively adjust the valve opening according to the dryness x of the inlet working fluid. When the dryness x of the working fluid is 0, the valve opening is 0%; as the dryness x of the working fluid increases, the valve opening increases rapidly; when the dryness x of the working fluid is 1, the valve opening is 100%; the flow rate regulation formula of the valve is: , where R is the valve adjustable ratio and x is the working fluid dryness.

[0008] Preferably, the air vent and liquid blocking valve includes a valve seat, a valve core and a float connected to the valve core. The valve seat is cylindrical or tubular, and has one or more channels inside for guiding the flow of gas and liquid; the valve core is spherical, conical or flat, and is embedded in the valve seat. The valve core opens when gas passes through and closes when liquid passes through, preventing the liquid from passing through; the float is spherical or elliptical, connected to the valve core, and the opening of the valve core is adjusted by changing the position of the float.

[0009] Preferably, the evaporator is a cold plate type evaporator, and the interior is a porous parallel flow flat tube microchannel evaporator, a plate-fin microchannel evaporator, or a porous medium evaporator.

[0010] Preferably, the condenser is an air-cooled condenser, a water-cooled condenser or an evaporatively cooled condenser.

[0011] Preferably, the two-phase cooling circulation system further includes a liquid pump, which is arranged between the evaporator branch and the liquid reservoir.

[0012] Preferably, the liquid pump is a speed-adjustable liquid pump.

[0013] Preferably, a return pipe is provided between the bottom of the ventilation and liquid-blocking valve and the inlet of the evaporator. The return pipe (9) connects the liquid pool at the bottom of the ventilation and liquid-blocking valve and the inlet of the evaporator. Before the liquid pump is started, the return pipe returns excess liquid at the bottom of the ventilation and liquid-blocking valve to the evaporator. The stored liquid working medium plays a role in cold storage. When the electronic equipment is suddenly heated, the stored liquid working medium evaporates and absorbs heat, forming an internal cycle to ensure an instantaneous cooling effect.

[0014] The present invention also discloses a working method of a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches. Based on the above-mentioned two-phase cooling circulation system, the liquid working medium flows from the liquid reservoir into the evaporator branch and enters the evaporator, absorbs heat generated by the electronic equipment in the evaporator, and undergoes a phase change from liquid to gas or gas-liquid two-phase; the vent and liquid-blocking valve prevents the liquid working medium from flowing through, and the gaseous working medium enters the condenser through the vent and liquid-blocking valve, is cooled in the condenser, releases heat to the environment, turns into liquid again, and enters the liquid reservoir after condensation; the liquid working medium in the liquid reservoir flows into the evaporator branch again, enters the evaporator, and continues the next cycle.

[0015] The present invention also discloses a control method for a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches. Based on the above two-phase cooling circulation system, a temperature sensor is set at the outlet of the evaporator of each branch, and a pressure sensor is set at the outlet of the liquid pump; the temperature sensor measures the superheat T of each evaporator outlet. sh , the pressure sensor measures the outlet pressure P of the liquid pump; when the superheat T sh When the superheat T is greater than 0, the liquid pump starts; sh When the pump outlet pressure P is greater than the blocking pressure P cri When , it means that all electronic equipment is not hot, the ventilation and liquid blocking valves are closed, and the liquid pump is turned off at this time.

[0016] The present invention has the following beneficial effects:

[0017] (1) The present invention does not require real-time measurement of the heat generated by the electronic equipment, but can achieve valve adjustment based on the state (dryness) of the working fluid, without the need for a complex control system, and can achieve adaptive adjustment;

[0018] (2) The present invention utilizes a vent and liquid-blocking valve to achieve on-demand adaptive distribution of the flow rate of each branch; the greater the heat generated by the electronic equipment on the branch, the higher the corresponding working fluid dryness, the smaller the resistance of the vent and liquid-blocking valve, and the larger the branch flow rate, which can effectively solve the problem of overheating and evaporation of the working fluid and improve system reliability; the smaller the heat generated by the electronic equipment on the branch, the lower the corresponding working fluid dryness, the greater the resistance of the vent and liquid-blocking valve, and the smaller the branch flow rate, which can effectively reduce the invalid flow that does not participate in the phase change, reduce the energy consumption of the liquid pump, and greatly improve the energy saving performance of the system;

[0019] (3) The present invention adopts a float-connected valve core method, which realizes automatic adjustment of the valve opening according to the dryness of the working fluid under the action of gravity / buoyancy. The greater the dryness of the working fluid, the smaller the buoyancy and the larger the valve opening. There is no need for external drive devices and complex measurement / control systems, and there is no need to measure the heat generation of electronic equipment in real time. The control is simple and the structure is compact.

[0020] (4) The present invention controls the start and stop and speed of the liquid pump by measuring the superheat at the evaporator outlet and the liquid pump outlet pressure, so as to realize automatic start of the pump when there is a heat load. The greater the heat load, the higher the speed of the liquid pump. The pump is automatically shut down when there is no heat load, thereby reducing the energy consumption of the liquid pump and improving the reliability of the system.

[0021] (5) The present invention connects the liquid pool at the bottom of the ventilation and liquid-blocking valve with the inlet of the evaporator through a return pipe. Before the liquid pump is started, the return pipe can return the liquid at the bottom of the ventilation and liquid-blocking valve to the evaporator. When the electronic equipment is suddenly heated, an internal circulation can be formed. The working fluid stored inside evaporates and absorbs cold energy, ensuring an instantaneous cooling effect and playing a role in cold storage. This solves the problem that the electronic equipment may be burned due to an instantaneous sudden heating load before the liquid pump is started. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of flow mismatch in traditional two-phase cooling cycle;

[0023] Figure 2 This is a schematic diagram of a two-phase cooling cycle with adaptive flow distribution of multiple evaporators according to the present invention;

[0024] Figure 3 This is a relationship diagram between the dryness and valve opening of the ventilation and liquid blocking valve of the present invention;

[0025] Figure 4 This is a two-phase pump-driven cooling cycle with adaptive flow distribution of multiple evaporators according to embodiment 1 of the present invention;

[0026] Figure 5 This is Example 2 of the present invention - a two-phase thermosiphon cooling cycle with adaptive flow distribution among multiple evaporators.

[0027] In the picture:

[0028] 1-Evaporator; 2-Electronic equipment; 3-Ventilation and liquid blocking valve; 31-Valve seat; 32-Valve core; 33-Float; 4-Condenser; 5-Liquid reservoir; 6-Liquid pump; 7-Temperature sensor; 8-Pressure sensor; 9-Return liquid pipe. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] The present invention discloses a two-phase cooling circulation system with a vent and liquid-blocking valve. The greater the dryness of the working fluid, the greater the valve opening and the smaller the resistance. Installing the above-mentioned vent and liquid-blocking valve at the outlet of each evaporator can achieve adaptive distribution of the flow of each branch. That is, the greater the heat generation of the electronic equipment on the branch, the higher the corresponding working fluid dryness, the smaller the resistance of the vent and liquid-blocking valve, and the greater the branch flow; the smaller the heat generation of the electronic equipment on the branch, the smaller the corresponding working fluid dryness, the greater the resistance of the vent and liquid-blocking valve, and the smaller the branch flow. Achieving adaptive on-demand distribution of the working fluid flow not only solves the problem of overheating and burning caused by small flow in the high-heat-generating branch, but also effectively reduces the ineffective flow in the low-heat-generating branch, significantly saving liquid pump energy consumption.

[0031] Example 1

[0032] like Figure 2 As shown, a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches includes multiple parallel evaporator branches and a condenser 4, a liquid reservoir 5, and a liquid pump 6. The above equipment is connected in sequence through pipelines to form a closed loop, and the loop is filled with phase change working fluid.

[0033] The evaporator branch includes an evaporator 1 and a vent and liquid-blocking valve 3. The evaporator 1 fits tightly against the electronic device 2 and absorbs heat generated by the electronic device through evaporation of a phase-change working fluid, cooling the electronic device 2. The vent and liquid-blocking valve 3 is installed on the evaporator branch to prevent liquid backflow and ensure smooth gas flow.

[0034] The air vent and liquid blocking valve 3 includes a valve seat 31, a valve core 32 and a float 33 connected to the valve core. The valve seat 31 is cylindrical or tubular, with one or more channels inside for guiding the flow of gas and liquid. The valve seat 31 provides an installation position for the valve core and the float; the valve core 32 can be spherical, conical or flat, and the specific shape depends on the design of the valve seat. In this embodiment, it is conical and embedded in the valve seat 31. The valve core 32 opens when gas passes through and closes when liquid flows through, preventing the liquid from passing through; the seal between the valve core 32 and the valve seat 31 ensures the sealing effect; the float 33 is spherical or elliptical, with sufficient volume and buoyancy to float freely in the liquid; the float 33 is connected to the valve core 32, and the opening of the valve core is adjusted by changing the position of the float.

[0035] The venting and liquid-blocking valve 3 can adjust the valve opening according to the dryness of the inlet working fluid: when the working fluid dryness is 0, the working fluid is pure liquid, the liquid level inside the venting and liquid-blocking valve 3 rises, the valve is closed, and the valve opening is 0%; the higher the dryness of the working fluid, the smaller the buoyancy, and the larger the valve opening; when the dryness of the working fluid is 1, the venting and liquid-blocking valve 3 contains pure gas, the valve core moves downward under the action of gravity, and the valve opening is 100%. The flow adjustment formula of the valve is: , where R is the valve adjustable ratio and x is the working fluid dryness. The venting and liquid blocking valve 3 forms a fast-opening flow characteristic according to the dryness x. When the dryness increases, the flow rate increases rapidly, such as Figure 3 shown.

[0036] The operating principle is as follows: When the inlet working fluid is primarily gas (high dryness), the gas pressure pushes the valve core 32 open. The valve core 32 leaves its sealed position, allowing gas to pass through the valve seat 31 and out the outlet. Due to the low density of the gas, the buoyancy of the float 33 is small, so the float 33 is positioned low and the valve core 32 remains wide open, ensuring smooth gas passage. When the inlet working fluid is primarily liquid (low dryness), the high density of the liquid causes the buoyancy of the float 33 to be greater, causing the float 33 to rise, driving the valve core 32 to close, reducing the valve core opening or even completely closing it, preventing liquid from passing.

[0037] Evaporator 1 is a cold plate type evaporator, internally containing a porous parallel flow flat tube microchannel evaporator, plate-fin microchannel evaporator, or porous medium evaporator. Condenser 4 is an air-cooled, water-cooled, or evaporative condenser, used to cool the gas after absorbing heat from the evaporator into liquid, releasing the heat to the environment. Liquid pump 6 is a variable speed liquid pump. The liquid reservoir stores liquid working fluid and ensures sufficient liquid working fluid is available in the system to supply the evaporator.

[0038] The liquid return pipe 9 connects the liquid pool at the bottom of the ventilation and liquid blocking valve 3 and the inlet of the evaporator 1. Before the liquid pump is started, the liquid return pipe 9 can return the excess liquid at the bottom of the ventilation and liquid blocking valve 3 to the evaporator 1. When the electronic equipment 2 is suddenly heated, an internal circulation can be formed. The phase change of the liquid working medium in the evaporator plays a role of cold storage, and the evaporation of the liquid working medium absorbs heat to ensure an instantaneous cooling effect.

[0039] A temperature sensor 7 is provided at the outlet of the evaporator 1 of each branch, and a pressure sensor 8 is provided at the outlet of the liquid pump 6.

[0040] Figure 4This diagram illustrates the operating principle of a two-phase pump-driven cooling cycle with adaptive flow distribution across multiple evaporators in Example 1 of the present invention. Three parallel evaporators cool three electronic devices (1#, 2#, and 3#). The heating values ​​of electronic devices 1#, 2#, and 3# are 1000W, 500W, and 0W, respectively. The outlet dryness of evaporators 1#, 2#, and 3# are 1, 0.5, and 0, respectively. For the 1# vent and liquid-blocking valve, the inlet fluid is pure gas with minimal buoyancy. Gravity causes the float 33 and valve core 32 to move downward, fully opening the valve with minimal resistance and a maximum circulation flow rate of 20 kg / h. For the 2# vent and liquid-blocking valve, the inlet fluid is a two-phase gas-liquid system. As the liquid level rises, the float 33 and valve core 32 move upward under buoyancy, closing the valve and reducing the circulation flow rate to 10 kg / h. For the 3# vent and liquid-blocking valve, the inlet fluid is pure liquid. As the liquid level continues to rise, the float 33 and valve core 32 continue to move upward under buoyancy, closing the valve and reducing the circulation flow rate to 0 kg / h. This system enables adaptive flow distribution among branches, ensuring a higher circulation flow rate in branches with higher calorific value and a lower circulation flow rate in branches with lower calorific value. This not only solves the problem of overheating and drying out of the working fluid in branches with higher calorific value, but also reduces the ineffective circulation flow in branches with lower calorific value, thereby lowering pump energy consumption.

[0041] Example 2

[0042] like Figure 5 As shown, Example 2 discloses a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches. The difference from Example 1 is that the system in Example 2 is not equipped with a liquid pump 6. When the liquid pump 6 is not provided, a gravity-driven two-phase thermal siphon cycle is formed.

[0043] Figure 5 This diagram illustrates the operating principle of the two-phase thermosiphon cycle with adaptive flow distribution across multiple evaporators in Example 2. This embodiment operates in the presence of gravity, with the condenser 4 positioned higher than the evaporator 1. The gas at the evaporator outlet, with its low density, flows upward to the condenser. The liquid at the condenser outlet, with its high density, flows back to the evaporator under gravity, forming a two-phase thermosiphon cycle. This cycle is driven by gravity, eliminating the need for a liquid pump 6. In this embodiment, the addition of a vent and liquid-blocking valve can also achieve adaptive flow distribution among the branches.

[0044] Example 3

[0045] The present invention also discloses a working method of a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches. In an initial state, a liquid working medium flows from a liquid reservoir (5) into the evaporator branch and enters the evaporator (1); the liquid working medium absorbs heat generated by an electronic device (2) in the evaporator (1) and undergoes a phase change, changing from a liquid state to a high-temperature, low-pressure gas; the high-temperature, low-pressure gas passes through a venting and liquid-blocking valve (3); due to the low density of the gas, the float (33) is in a low position, and the valve core (32) maintains a large opening, allowing the gas to pass through; the gas enters a condenser (4), is cooled in the condenser, releases heat to the environment, and becomes a low-temperature, high-pressure liquid; the condensed liquid working medium flows out of the condenser (4) and enters the liquid reservoir (5); the liquid working medium in the liquid reservoir (5) flows into the evaporator branch again and enters the evaporator (1), continuing the next cycle.

[0046] The two-phase cooling system achieves efficient and reliable thermal management by circulating a phase-changing working fluid between the evaporator and condenser. The evaporator absorbs heat, and a vent valve prevents backflow. The valve opening is determined by the working fluid's dryness. Adaptive flow distribution, heat dissipation in the condenser, and storage of liquid working fluid in the reservoir ensure stable system operation, making it particularly suitable for cooling high-power electronic equipment.

[0047] Example 4

[0048] The present invention also discloses a control method for a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches. Based on the two-phase cooling circulation system with a liquid pump 6 in Example 1, a temperature sensor 7 is provided at the outlet of the evaporator 1 of each branch, and a pressure sensor 8 is provided at the outlet of the liquid pump 6. The start and stop of the liquid pump 6 are controlled based on the temperature sensor 7 and the pressure sensor 8. Specifically:

[0049] Temperature sensor 7 measures the outlet temperature and superheat T of each evaporator sh , pressure sensor 8 measures the outlet pressure P of the liquid pump; when the superheat T sh When it is greater than 0, it means there is heat load and the liquid pump starts; when the superheat T sh When the pump outlet pressure P is greater than the blocking pressure P, the total flow rate can no longer meet the heat dissipation requirements and the flow rate needs to be further increased. Therefore, the pump speed increases. cri When , all electronic devices 2 are not heating, and the ventilation and liquid blocking valves 3 are closed, the liquid pump 6 is turned off. This ensures that the pump automatically starts when there is a heat load. The greater the heat load, the higher the liquid pump speed. The pump automatically shuts down when there is no heat load, reducing the energy consumption of the liquid pump and improving system reliability.

[0050] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims

1. A two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches, characterized in that: The invention comprises a plurality of parallel evaporator branches and a condenser (4) and a liquid reservoir (5) connected to the evaporator branches in sequence via pipelines. The evaporator branches, the condenser (4), and the liquid reservoir (5) form a closed loop, and the loop is filled with a phase-changing working medium. The evaporator branch comprises an evaporator (1) and a venting and liquid-blocking valve (3). The venting and liquid-blocking valve (3) is arranged at the outlet of the evaporator (1) and is positioned higher than the evaporator (1). The evaporator (1) is tightly fitted with the electronic device (2) to cool the electronic device (2). The venting and liquid-blocking valve (3) can adaptively adjust the valve opening according to the dryness x of the inlet working fluid. When the dryness x of the working fluid is 0, the valve opening is 0%; as the dryness x of the working fluid increases, the valve opening increases rapidly; when the dryness x of the working fluid is 1, the valve opening is 100%; the flow rate regulation formula of the valve is: , where R is the valve adjustable ratio and x is the working fluid dryness.

2. The two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches according to claim 1, characterized in that: The air vent and liquid blocking valve (3) comprises a valve seat (31), a valve core (32) and a float (33) connected to the valve core (32). The valve seat (31) is cylindrical or tubular and has one or more channels inside for guiding the flow of gas and liquid. The valve core (32) is spherical, conical or flat and is embedded in the valve seat (31). The valve core (32) opens when gas passes through and closes when liquid passes through, thereby preventing the liquid from passing through. The float (33) is spherical or elliptical and is connected to the valve core (32). The opening of the valve core (32) is adjusted by changing the position of the float (33).

3. The two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches according to claim 1, characterized in that: The evaporator (1) is a cold plate type evaporator, and the interior thereof is a porous parallel flow flat tube microchannel evaporator, a plate-fin microchannel evaporator, or a porous medium evaporator.

4. The two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches according to claim 1, characterized in that: The condenser (4) is an air-cooled condenser, a water-cooled condenser, or an evaporatively cooled condenser.

5. The two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches according to claim 1, characterized in that: The two-phase cooling circulation system further comprises a liquid pump (6), which is arranged between the evaporator branch and the liquid reservoir (5).

6. The two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches according to claim 5, characterized in that: The liquid pump (6) is a speed-adjustable liquid pump.

7. The two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches according to claim 5 or 6, characterized in that: A liquid return pipe (9) is provided at the bottom of the venting liquid blocking valve (3) and the inlet of the evaporator (1). The liquid return pipe (9) connects the liquid pool at the bottom of the venting liquid blocking valve (3) and the inlet of the evaporator (1). Before the liquid pump (6) is started, the liquid return pipe (9) returns excess liquid at the bottom of the venting liquid blocking valve (3) to the evaporator (1). The stored liquid working medium plays a role of cold storage. When the electronic equipment (2) is suddenly heated, the stored liquid working medium evaporates and absorbs heat, forming an internal cycle to ensure an instantaneous cooling effect.

8. A method for operating a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches according to any one of claims 1 to 7, characterized in that: The liquid working medium flows from the liquid reservoir (5) into the evaporator branch and enters the evaporator (1), where it absorbs heat generated by the electronic equipment (2) and undergoes a phase change from liquid to gas or gas-liquid two-phase; the venting and liquid-blocking valve (3) blocks the liquid working medium from flowing through, and the gaseous working medium enters the condenser (4) through the venting and liquid-blocking valve (3), where it is cooled, releases heat to the environment, and turns back into liquid, condenses, and enters the liquid reservoir (5); the liquid working medium in the liquid reservoir (5) flows into the evaporator branch again and enters the evaporator (1), continuing the next cycle.

9. A control method for a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches according to any one of claims 5 to 8, wherein a temperature sensor (7) is provided at the outlet of the evaporator (1) of each branch, and a pressure sensor (8) is provided at the outlet of the liquid pump (6); the temperature sensor (7) measures the superheat T at the outlet of each evaporator. sh , the pressure sensor (8) measures the outlet pressure P of the liquid pump; when the superheat T sh When the superheat T is greater than 0, the liquid pump starts; sh When the pump outlet pressure P is greater than the blocking pressure P cri When , it means that all electronic devices (2) are not hot, the ventilation and liquid blocking valves (3) are closed, and the liquid pump (6) is turned off.

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