Multi-evaporator branch flow self-adaptive distribution two-phase cooling circulation system and control method thereof

Abstract

The invention discloses a multi-evaporator branch flow self-adaptive distribution two-phase cooling cycle and a control method thereof, the multi-evaporator branch flow self-adaptive distribution two-phase cooling cycle mainly comprises a plurality of parallel evaporators, a condenser, a liquid storage device, a liquid pump and a connecting pipeline, and a ventilation liquid blocking valve is mounted at an outlet of each branch evaporator. The ventilation liquid blocking valve is mainly composed of a valve seat, a valve element and a floating ball, the opening degree of the valve is automatically adjusted according to the dryness of an inlet working medium under the action of gravity and buoyancy, and the larger the dryness is, the larger the opening degree of the valve is. When the heat loads of the branches are not synchronous, the circulation flow can be distributed in a self-adaptive mode according to needs, the larger the heat loads on the branches are, the higher the dryness of the corresponding working media is, the smaller the resistance of the ventilation liquid blocking valve is, and the larger the flow of the branches is. The smaller the thermal load on the branch is, the smaller the dryness of the corresponding working medium is, the larger the resistance of the ventilation liquid blocking valve is, and the smaller the flow of the branch is. The problem that a high-load branch is prone to being overheated and burnt due to small flow is solved, meanwhile, invalid flow of a low-load branch can be effectively reduced, and energy consumption of a liquid pump is greatly saved.

Description

Technical Field

[0001] The 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 equipment, the heat generation and heat flux density of electronic equipment are gradually increasing. Traditional single-phase heat dissipation technology based on air cooling and water cooling is difficult to meet the heat dissipation needs. The two-phase thermal siphon cycle (separate heat pipe cycle) based on phase change heat transfer is widely used due to its advantages such as high heat transfer efficiency, good isothermal properties, and flexible layout. In order to solve the problem of insufficient liquid return capacity when the height difference is insufficient and the resistance is large, a pump-driven two-phase cooling cycle is further developed, which can greatly improve the circulation liquid return capacity and reliability. At present, the gravity-driven / liquid pump-driven two-phase cooling cycle has become a technical solution with broad application prospects in the thermal management of electronic equipment.

[0003] In the thermal management of electronic equipment, it is sometimes necessary to dissipate heat for multiple electronic equipment at the same time. Therefore, the two-phase cooling cycle requires multiple evaporators to work in parallel. The pipe diameter / impedance of each evaporator branch is usually equal to ensure that the circulation flow of each branch is equal when the electronic equipment works synchronously (equal heat generation). However, due to the randomness and asynchrony of the heat generation of each electronic equipment, it is often difficult to match the circulation flow of each branch; and the greater the heat generation of the branch, the greater the dryness and flow resistance in the evaporator, which causes the circulation flow of the branch to decrease, which is very likely to overheat and burn 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 with a larger heat output is higher, the resistance is greater, and the circulation flow is smaller. The flow rates of 1#, 2#, and 3# evaporators are 3kg / h, 8kg / h, and 20kg / h respectively, which causes 1# evaporator to overheat and burn 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 cycle, in order to avoid overheating of a branch due to evaporation, the total circulation flow can only be increased by a liquid pump, but most of the flow does not participate in the phase change and becomes "invalid flow", resulting in a huge waste of energy. In addition, the two-phase cooling system provides heat dissipation services for electronic equipment, but it is impossible to predict or measure the heat generated by electronic equipment in real time. Therefore, it is urgent to develop a two-phase cooling cycle that can achieve adaptive flow distribution without real-time measurement of the heat generated by electronic equipment, and realize adaptive flow distribution of each branch according to the state of the working fluid (dryness, etc.), so as to ensure that each branch will not be overheated and evaporated, while saving liquid pump energy consumption. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches and a control method thereof. The adaptive on-demand distribution of the working fluid flow is achieved through a ventilation and liquid-blocking valve, which 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 the energy consumption of the liquid pump.

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

[0006] A two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches, comprising multiple parallel evaporator branches and a condenser (4) and a liquid reservoir (5) connected to the evaporator branches in sequence by pipelines, wherein 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) being arranged at the outlet of the evaporator (1) and being located higher than the evaporator (1); the evaporator (1) is closely fitted to 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 adjustment formula of the valve is: Where R is the valve adjustable ratio, and x is the working fluid dryness.

[0008] Preferably, the venting 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, and is connected to the valve core. 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 comprises a liquid pump, which is arranged between the evaporator branch and the liquid reservoir.

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

[0013] Preferably, a liquid return pipe is provided at the bottom of the ventilation liquid blocking valve and connected to the evaporator inlet. The liquid return pipe (9) connects the liquid pool at the bottom of the ventilation liquid blocking valve and the evaporator inlet. Before the liquid pump is started, the liquid return pipe returns excess liquid at the bottom of the ventilation liquid blocking valve to the evaporator. The stored liquid working medium plays a role of 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, liquid working medium flows from the liquid reservoir into the evaporator branch, enters the evaporator, absorbs heat generated by the electronic equipment in the evaporator, undergoes a phase change, and changes from liquid to gas or gas-liquid two-phase; the vent liquid-blocking valve prevents the liquid working medium from flowing through, and the gaseous working medium enters the condenser through the vent liquid-blocking valve, is cooled in the condenser, releases heat to the environment, becomes 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 arranged at the outlet of the evaporator of each branch, and a pressure sensor is arranged 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 realize valve adjustment according to the state (dryness) of the working fluid, without the need for a complex control system, and can realize adaptive adjustment;

[0018] (2) The present invention utilizes a venting and liquid-blocking valve to achieve on-demand adaptive distribution of the flow 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 venting and liquid-blocking valve, and the greater the branch flow, which can effectively solve the problem of overheating and drying 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 venting and liquid-blocking valve, and the smaller the branch flow, 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 of the system;

[0019] (3) The present invention adopts a method of connecting the float ball to the valve core. Under the action of gravity / buoyancy, the valve opening is automatically adjusted according to the working fluid dryness. The greater the working fluid dryness, the smaller the buoyancy, and the greater the valve opening. No external drive device and complex measurement / control system are required, and no real-time measurement of the heat generation of electronic equipment is required. 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, and the greater the heat load, the greater the speed of the liquid pump. The pump is automatically turned off 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 liquid return pipe. Before the liquid pump is started, the liquid 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 achieving a cold storage effect, thereby solving the problem of electronic equipment being burned due to an instantaneous sudden heating load before the liquid pump is started. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of flow mismatch in a traditional two-phase cooling cycle;

[0023] Figure 2 A two-phase cooling cycle principle diagram of the present invention with multi-evaporator flow adaptive distribution;

[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 It is a two-phase pump-driven cooling cycle with adaptive flow distribution of multiple evaporators in Example 1 of the present invention;

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

[0027] In the figure:

[0028] 1-evaporator; 2-electronic equipment; 3-ventilation and liquid blocking valve; 31-valve seat; 32-valve core; 33-float; 4-condenser; 5-liquid storage tank; 6-liquid pump; 7-temperature sensor; 8-pressure sensor; 9-liquid return pipe. DETAILED DESCRIPTION

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

[0030] The present invention discloses a two-phase cooling circulation system with a ventilating and liquid-blocking valve. The greater the dryness of the working fluid, the greater the valve opening and the smaller the resistance. The above-mentioned ventilating and liquid-blocking valve is installed at the outlet of each evaporator, so as to realize adaptive distribution of flow rates of each branch, that is, the greater the calorific value of the electronic equipment on the branch, the higher the corresponding working fluid dryness, the smaller the resistance of the ventilating and liquid-blocking valve, and the greater the branch flow rate; the smaller the calorific value of the electronic equipment on the branch, the smaller the corresponding working fluid dryness, the greater the resistance of the ventilating and liquid-blocking valve, and the smaller the branch flow rate. Realizing adaptive distribution of working fluid flow rate on demand not only solves the problem of overheating and burning caused by small flow rate of high-heat-generating branches, but also effectively reduces the invalid flow of low-heat-generating branches, greatly 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 storage device 5, and a liquid pump 6. The above devices are 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 venting and liquid blocking valve 3. The evaporator 1 is closely fitted with the electronic device 2, and absorbs the heat generated by the electronic device through the evaporation of the phase change working medium to cool the electronic device 2. The venting and liquid blocking valve 3 is installed on the evaporator branch to prevent liquid backflow and ensure smooth passage of gas.

[0034] The 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, and has 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 to prevent 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, and has sufficient volume and buoyancy so that it can 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 imported 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 greater the dryness of the working fluid, the smaller the buoyancy, and the greater 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 increases rapidly, such as Figure 3 shown.

[0036] The working principle is: when the inlet working fluid is mainly gas (the dryness of the inlet working fluid is relatively high), the pressure of the gas will push the valve core 32 to open. The valve core 32 leaves the sealing position, allowing the gas to pass through the valve seat 31 and flow out from the outlet. Since the density of the gas is relatively low, the buoyancy of the float 33 is relatively small, so the float 33 is in a lower position, and the valve core 32 maintains a relatively large opening to ensure smooth passage of the gas. When the inlet working fluid is mainly liquid (the dryness of the inlet working fluid is relatively low), since the density of the liquid is relatively high, the buoyancy of the float 33 is relatively large, so the float 33 rises, driving the valve core 32 to close, reducing the opening of the valve core, or even completely closing it to prevent the liquid from passing through.

[0037] The evaporator 3 is a cold plate type evaporator, and the interior is a porous parallel flow flat tube microchannel evaporator, a plate-fin microchannel evaporator, a porous medium evaporator, etc. The condenser 4 is an air-cooled condenser, a water-cooled condenser or an evaporative cooling condenser, which is used to cool the gas after absorbing heat from the evaporator into liquid and release the heat to the environment. The liquid pump 6 is an adjustable speed liquid pump. The liquid reservoir is used to store liquid working fluid and ensure that there is enough liquid working fluid 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 in cold storage, and the liquid working medium evaporates and 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 is a working principle diagram of a two-phase pump-driven cooling cycle with adaptive flow distribution of multiple evaporators in Example 1 of the present invention. Three sets of evaporators are connected in parallel to cool three electronic devices (1#, 2#, 3#). The calorific values ​​of the 1#, 2#, and 3# electronic devices are 1000W, 500W, and 0W respectively. The outlet dryness of the 1#, 2#, and 3# evaporators is 1, 0.5, and 0 respectively. For the 1# venting and liquid-blocking valve, the inlet working medium is pure gas with very small buoyancy. Under the action of gravity, the float 33 and the valve core 32 move downward, the valve is fully open, the resistance is minimal, and the maximum circulation flow rate is 20kg / h; for the 2# venting and liquid-blocking valve, the inlet working medium is gas-liquid two-phase, the liquid level rises, the float 33 and the valve core 32 move upward under the action of buoyancy, the valve is closed, and the circulation flow rate is 10kg / h; for the 3# venting and liquid-blocking valve, the inlet working medium is pure liquid, the liquid level continues to rise, the float 33 and the valve core 32 continue to move upward under the action of buoyancy, the valve is closed, and the circulation flow rate is 0kg / h. Based on this, adaptive distribution of the flow of each branch can be achieved, that is, the circulation flow rate of the branch with high calorific value is large, and the circulation flow rate of the branch with low calorific value is small. It can not only solve the problem of overheating and drying of the working medium in the high calorific value branch, but also reduce the invalid circulation flow of the low calorific value branch and reduce the energy consumption of the pump.

[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 provided 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 The working principle diagram of the two-phase thermosiphon cycle with adaptive flow distribution of multiple evaporators in Example 2. This embodiment is used in the presence of gravity, and the position of the condenser 4 must be higher than the evaporator 1. The gas density at the evaporator outlet is small and flows upward to the condenser, and the liquid density at the condenser outlet is large and flows back to the evaporator under the action of gravity, forming a two-phase thermosiphon cycle. This cycle is driven by gravity and does not require the installation of a liquid pump 6. In this embodiment, adding a venting and liquid blocking valve can also achieve adaptive flow distribution of each branch.

[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 an evaporator branch and enters an 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 circulation system achieves efficient and reliable thermal management through the circulation of phase-changing working fluid between the evaporator and the condenser. The evaporator absorbs heat, the ventilation and liquid blocking valve prevents liquid backflow, and the valve opening is determined according to the working fluid dryness. The adaptive flow distribution, condenser heat dissipation and liquid storage in the liquid reservoir jointly ensure the stable operation of the system, which is particularly suitable for the cooling needs of 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. On the basis of 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 is 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 total flow rate increases, it means that the total flow rate can no longer meet the heat dissipation requirements and the flow rate needs to be further increased, so the liquid pump speed increases; when the liquid pump outlet pressure P is greater than the blocking pressure P cri When , it means that all electronic equipment 2 are not hot, and the ventilation and liquid blocking valves 3 are all closed, and the liquid pump 6 is turned off at this time. In this way, the pump is automatically turned on when there is a heat load, and the greater the heat load, the greater the speed of the liquid pump. The pump is automatically turned off when there is no heat load, which reduces the energy consumption of the liquid pump and improves the reliability of the system.

[0050] The above description is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope 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 storage device (5) which are sequentially connected to the evaporator branches by pipelines. The evaporator branches, the condenser (4) and the liquid storage device (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 located higher than the evaporator (1). The evaporator (1) is closely fitted to 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 adjustment 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 venting and liquid blocking valve (3) comprises a valve seat (31), a valve core (32) and a floating ball (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 floating ball (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 floating ball (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 storage tank (5).

6. The two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches as claimed in 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 as claimed in claim 6 or 7, characterized in that: A liquid return pipe (9) is provided at the bottom of the ventilation and liquid blocking valve (3) and is connected to the inlet of the evaporator (1). 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 (6) is started, the liquid return pipe (9) returns excess liquid at the bottom of the ventilation and 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 subjected to a sudden heating load, 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, becomes liquid again, and enters the liquid reservoir (5) after condensation; the liquid working medium in the liquid reservoir (5) flows into the evaporator branch again and enters the evaporator (1), where the next cycle continues.

9. A control method for a two-phase cooling circulation system with adaptive flow distribution of multiple evaporator branches as claimed in any one of claims 5 to 7, 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 equipment (2) are not heated, the ventilation and liquid blocking valves (3) are closed, and the liquid pump (6) is turned off at this time.

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