Liquid cooling system and flow control method

Abstract

The invention relates to the technical field of refrigeration, in particular to a liquid cooling system and a flow control method, and the liquid cooling system comprises a cold source side system and a cooling side system; a heat exchanger is arranged between the cold source side system and the cooling side system; the heat exchanger is provided with a waterway pipeline; the cooling side system comprises a water tank, a circulating pump, a first cooling loop, a second cooling loop and a bypass pipeline. By adding the water tank and the bypass pipeline, cold storage treatment can be carried out, the water temperature of the water tank is kept in an adaptive cold supply temperature interval all the time, and measures such as a multi-path cooling flow distribution mechanism are taken in cooperation, so that the problems of single-path liquid supply, poor variable flow adaptability, long response time and large liquid supply temperature fluctuation of an existing liquid cooling system are solved; and the cooling heat dissipation efficiency and the cooling reliability are improved.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to a liquid cooling system and a flow control method. Background Art

[0002] In the process of today's technological development, various types of high-power heating devices continue to emerge and are widely used in many fields such as electronics, energy, and industrial manufacturing. For example, servers in data centers, battery systems for new energy vehicles, and high-performance computers generate a lot of heat during operation. When the heat cannot be dissipated in a timely and effective manner, the performance of the equipment will be seriously affected, and may even cause equipment failure and shorten the service life of the equipment.

[0003] Traditional air cooling technology has limited heat dissipation capacity and can no longer meet the growing cooling needs of high-power heat generating equipment. Therefore, liquid cooling systems have gradually become a key technical means to solve the heat dissipation problem of high-power equipment. However, existing liquid cooling systems have exposed many drawbacks in practical applications.

[0004] First of all, the existing liquid cooling systems mostly use a single-channel liquid supply method, which lacks flow distribution function. In actual application scenarios, an equipment system often contains multiple loads with different flow characteristics. The existing liquid cooling system with a single-channel liquid supply cannot perform personalized flow distribution for these different loads, resulting in insufficient heat dissipation for some loads, while some loads may be overcooled, and efficient heat dissipation cannot be achieved.

[0005] Secondly, the existing liquid cooling system has poor performance in variable flow adaptability and currently adopts a constant flow liquid supply mode. When the system flow is low, the evaporation temperature in the evaporator will be too low, causing the performance of the evaporator to deteriorate significantly and there is a risk of the evaporator freezing and cracking.

[0006] Furthermore, the existing liquid cooling system has a long response time. From the time the device is turned on to the time the compressor starts and reaches the maximum output, there is a frequency increase process and a heat conduction process. This series of processes makes the system unable to quickly provide cooling, resulting in a delay in the heat dissipation and cooling function. Users need to wait for a long time for the device to reach a normal heat dissipation state.

[0007] Finally, the response time of the existing liquid-cooled host is slow, which directly leads to large fluctuations in the liquid supply temperature. In the early stage of liquid supply, the liquid supply temperature is often too high due to the slow response of the system. Moreover, regardless of the heat load and the different initial return water temperatures, the existing system uses a constant compressor starting platform speed, which lacks flexibility and adaptability, making it impossible for the system to accurately adjust the liquid supply temperature according to different heat load conditions. For mainstream batteries, the optimal operating temperature range is between 20-35°C. If the liquid supply temperature exceeds this range for a long time during the heat dissipation process, it will directly affect the battery life. Summary of the invention

[0008] The object of the present invention is to provide a liquid cooling system and a flow control method in view of the above-mentioned deficiencies in the prior art.

[0009] The object of the present invention is achieved through the following technical solutions: A liquid cooling system, comprising a cold source side system and a cooling side system; a heat exchanger is provided between the cold source side system and the cooling side system; the heat exchanger is provided with a water pipeline;

[0010] The cooling side system includes a water tank, a circulation pump, a first cooling circuit, a second cooling circuit and a bypass pipeline;

[0011] The first cooling circuit includes a first cooling valve and a first heating device; one end of the water tank is connected to one end of the circulation pump; the other end of the circulation pump is connected to one end of the water pipe; the other end of the water pipe is connected to the other end of the water tank through a bypass pipe; the bypass pipe is provided with a bypass valve; the other end of the water pipe is connected to the other end of the water tank after passing through the first heating device; the first cooling valve is provided between the other end of the water pipe and the first heating device;

[0012] The second cooling circuit includes a second cooling valve and a second heating device; the other end of the water pipe is connected to the other end of the water tank after passing through the second heating device; the second cooling valve is arranged between the other end of the water pipe and the second heating device.

[0013] The present invention is further configured such that the bypass valve is provided with an electric heating element.

[0014] The present invention is further configured such that a first flow meter is provided between the other end of the water pipeline and the first cooling valve; and a second flow meter is provided between the other end of the water pipeline and the second cooling valve.

[0015] The present invention is further configured such that a first one-way valve and a first filter are provided between the other end of the water tank and the first heating device;

[0016] A second one-way valve and a second filter are provided between the other end of the water tank and the second heating device.

[0017] The present invention is further configured as follows: the cold source side system includes a compressor, a condenser and an electronic expansion valve; the heat exchanger is provided with a fluorine path pipeline; one end of the compressor is connected to one end of the condenser; the other end of the condenser is connected to one end of the electronic expansion valve; the other end of the electronic expansion valve is connected to the other end of the compressor through the fluorine path pipeline.

[0018] The present invention is further configured such that a drying filter is provided between the electronic expansion valve and the condenser; and a fan is provided at the condenser.

[0019] A flow control method for a liquid cooling system comprises the following steps:

[0020] Step S1, receiving a power-on command, and then proceeding to step S2;

[0021] Step S2, open the first cooling valve and the second cooling valve, and close the bypass valve, and then enter step S3;

[0022] Step S3, the circulating pump operates at an initial speed, and then proceeds to step S4;

[0023] Step S4, the circulating pump performs automatic adjustment, and then proceeds to step S5;

[0024] Step S5, determine whether the total flow of the cooling side system is within the first flow range, if so, proceed to step S6, if not, return to step S4;

[0025] Step S6, determining whether the flow rates of each cooling circuit are within the second flow rate interval, if so, proceeding to step A1, if not, proceeding to step B1;

[0026] Step A1, determine whether the evaporator temperature is less than the low temperature alarm value; if so, increase the bypass valve opening and return to step S4; if not, proceed to step A2;

[0027] Step A2, maintaining the opening of the first cooling valve, the opening of the second cooling valve and the opening of the bypass valve, and determining whether a shutdown command is received, if yes, proceeding to step A3, if no, returning to step S4;

[0028] Step A3, close the first cooling valve and the second cooling valve, open the bypass valve, and then proceed to step A4;

[0029] Step A4, turn off the circulation pump, and then go to step A5;

[0030] Step A5, closing the bypass valve;

[0031] Step B1, determine whether the flow rate of the first cooling circuit is within the third flow rate interval, if yes, proceed to step B11, if no, proceed to step B12;

[0032] Step B11, reduce the opening of the second cooling valve and then return to step S4;

[0033] Step B12, reduce the opening of the first cooling valve and then return to step S4.

[0034] The present invention is further configured as follows: in step A1, it is determined whether the evaporator temperature is less than the low temperature alarm value; if the bypass valve is opened by 10%, it returns to step S4 after waiting for 10 seconds; in step S3, the circulating pump operates at an initial speed, and enters step S4 after waiting for 5 seconds.

[0035] The present invention is further configured such that the first flow interval is target total flow - target total flow * flow deviation rate; the second flow interval is target branch flow - target branch flow * flow deviation rate; the third flow interval is target first loop flow - target first loop flow * flow deviation rate.

[0036] The present invention is further configured to receive a power-on instruction in step S1, and then proceed to step S2 and step C1;

[0037] The method further includes step C1, the compressor is in standby mode, and then proceeds to step C2;

[0038] Step C2, determine whether the water tank temperature is between the first water temperature value and the second water temperature value, if so, proceed to step C3, if not, proceed to step C4;

[0039] Step C3, judging whether the total flow of the cooling side system is less than the flow setting value, if so, the compressor starting speed is the first platform speed, if not, the compressor starting speed is the second platform speed, wherein the first platform speed is less than the second platform speed;

[0040] Step C4, determine whether the water tank temperature is greater than the second water temperature value, if so, the compressor starting speed is the second platform speed, if not, return to step C1.

[0041] Beneficial effects of the present invention: The present invention can perform cold storage processing by adding a water tank and a bypass pipe, keep the water temperature of the water tank always in an appropriate cooling temperature range, and cooperate with measures such as a multi-channel cooling flow distribution mechanism to solve the problems of single-channel liquid supply, poor variable flow adaptability, long response time and large fluctuations in liquid supply temperature in existing liquid cooling systems, thereby improving cooling and heat dissipation efficiency and cooling reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0043] Figure 1 is a system flow chart of the present invention;

[0044] Figure 2 It is a structural principle diagram of the present invention;

[0045] Among them: 1. heat exchanger; 11. water pipeline; 12. fluorine pipeline; 21. water tank; 22. circulation pump; 23. bypass pipeline; 24. electric heating element; 25. bypass valve; 31. first cooling valve; 32. first heating device; 33. first flow meter; 34. first non-return valve; 35. first filter; 41. second cooling valve; 42. second heating device; 43. second flow meter; 44. second non-return valve; 45. second filter; 51. compressor; 52. condenser; 53. electronic expansion valve; 54. drying filter; 55. fan. DETAILED DESCRIPTION

[0046] The present invention is further described in conjunction with the following examples.

[0047] Depend on Figure 1 to Figure 2 It can be seen that the liquid cooling system described in this embodiment includes a cold source side system and a cooling side system; a heat exchanger 1 is provided between the cold source side system and the cooling side system; the heat exchanger 1 is provided with a water pipe 11;

[0048] The cooling side system includes a water tank 21, a circulation pump 22, a first cooling circuit, a second cooling circuit and a bypass pipe 23;

[0049] The first cooling circuit includes a first cooling valve 31 and a first heating device 32; one end of the water tank 21 is connected to one end of the circulation pump 22; the other end of the circulation pump 22 is connected to one end of the water pipe 11; the other end of the water pipe 11 is connected to the other end of the water tank 21 through a bypass pipe 23; the bypass pipe 23 is provided with a bypass valve 25; the other end of the water pipe 11 is connected to the other end of the water tank 21 after passing through the first heating device 32; the first cooling valve 31 is provided between the other end of the water pipe 11 and the first heating device 32;

[0050] The second cooling circuit includes a second cooling valve 41 and a second heating device 42; the other end of the water pipe 11 is connected to the other end of the water tank 21 through the second heating device 42; the second cooling valve 41 is arranged between the other end of the water pipe 11 and the second heating device 42; wherein the first cooling valve 31, the second cooling valve 41 and the bypass valve 25 are all electric regulating valves. In the liquid cooling system described in this embodiment, the bypass valve 25 is provided with an electric heating element 24.

[0051] Specifically, the liquid cooling system described in this embodiment includes a cold source side system and a cooling side system. When in use, the cold source side system provides cooling to the cooling side system through a heat exchanger 1; the two cooling circuits of the cooling side system share a circulation pump 22, and flow meters are respectively provided in the two cooling circuits to monitor the flow of different cooling circuits. At the same time, cooling valves are respectively provided in the two cooling circuits to achieve precise flow distribution control. The cooling side system is also provided with a bypass pipe 23 with a bypass valve 25, and an electric heating element 24 is provided on the bypass pipe 23, which can control and adjust the water temperature of the water tank 21.

[0052] This embodiment can perform cold storage processing by adding a water tank 21 and a bypass pipe 23, keeping the water temperature of the water tank 21 always in an appropriate cooling temperature range, and coordinating measures such as a multi-channel cooling flow distribution mechanism to solve the problems of single-channel liquid supply, poor adaptability to variable flow, long response time, and large fluctuations in liquid supply temperature in existing liquid cooling systems, thereby improving cooling and heat dissipation efficiency and cooling reliability.

[0053] In the liquid cooling system described in this embodiment, a first flow meter 33 is provided between the other end of the water pipe 11 and the first cooling valve 31; a second flow meter 43 is provided between the other end of the water pipe 11 and the second cooling valve 41. The above arrangement facilitates understanding of the flow rates of the first cooling circuit and the second cooling circuit.

[0054] In the liquid cooling system described in this embodiment, a first one-way valve 34 and a first filter 35 are provided between the other end of the water tank 21 and the first heating device 32; the first one-way valve 34 can prevent the liquid in the first cooling circuit from flowing back; the first filter 35 can filter the liquid in the first cooling circuit.

[0055] A second one-way valve 44 and a second filter 45 are provided between the other end of the water tank 21 and the second heating device 42. The second one-way valve 44 can prevent the liquid in the second cooling circuit from flowing back, and the second filter 45 can filter the liquid in the second cooling circuit.

[0056] In the liquid cooling system described in this embodiment, the cold source side system includes a compressor 51, a condenser 52 and an electronic expansion valve 53; the heat exchanger 1 is provided with a fluorine pipeline 12; one end of the compressor 51 is connected to one end of the condenser 52; the other end of the condenser 52 is connected to one end of the electronic expansion valve 53; the other end of the electronic expansion valve 53 is connected to the other end of the compressor 51 after passing through the fluorine pipeline 12. Through the above arrangement, cold energy can be generated at the fluorine pipeline 12, and then transferred to the water pipeline 11 through the heat exchanger 1.

[0057] In the liquid cooling system described in this embodiment, a drying filter 54 is provided between the electronic expansion valve 53 and the condenser 52; the above arrangement plays a role in filtering impurities. A fan 55 is provided at the condenser 52. The above arrangement facilitates the discharge of heat from the condenser 52.

[0058] A flow control method for a liquid cooling system described in this embodiment includes the following steps:

[0059] Step S1, receiving a power-on command, and then proceeding to step S2;

[0060] Step S2, open the first cooling valve 31 and the second cooling valve 41, and close the bypass valve 25, and then enter step S3;

[0061] Step S3, the circulating pump 22 operates at an initial speed, and then proceeds to step S4;

[0062] Step S4, the circulating pump 22 performs automatic adjustment, and then proceeds to step S5;

[0063] Step S5, determine whether the total flow of the cooling side system is within the first flow range, if so, proceed to step S6, if not, return to step S4;

[0064] Step S6, determining whether the flow rates of each cooling circuit are within the second flow rate interval, if so, proceeding to step A1, if not, proceeding to step B1;

[0065] Step A1, determine whether the evaporator temperature is less than the low temperature alarm value; if so, increase the opening of the bypass valve 25 and return to step S4; if not, enter step A2; at this time, increase the opening of the bypass valve 25 to prevent the unit from shutting down due to low evaporation temperature, and store cold in the water tank 2 at the same time.

[0066] Step A2, maintaining the opening of the first cooling valve 31, the opening of the second cooling valve 41 and the opening of the bypass valve 25, and determining whether a shutdown command is received, if so, proceeding to step A3, if not, returning to step S4;

[0067] Step A3, close the first cooling valve 31 and the second cooling valve 41, open the bypass valve 25, and then enter step A4; at this time, opening the bypass valve 25 can enable the first heating device 32 to be more quickly separated from the cooling side system of the liquid cooling system, while the compressor 51 of the cold source side system keeps reducing the frequency at a normal speed, and the electronic expansion valve 53 keeps adjusting the opening at a normal speed and shuts down.

[0068] Step A4, turn off the circulation pump 22, and then go to step A5;

[0069] Step A5, closing the bypass valve 25;

[0070] Step B1, determine whether the flow rate of the first cooling circuit is within the third flow rate interval, if yes, proceed to step B11, if no, proceed to step B12;

[0071] Step B11, reduce the opening of the second cooling valve 41 and then return to step S4;

[0072] Step B12: reduce the opening of the first cooling valve 31 and then return to step S4.

[0073] Specifically, assuming that the total flow of the cooling side system is 100, when the flow requirement of the first cooling circuit (vehicle end) is 80, and the flow requirement of the second cooling circuit (pile end) is 20, calculated based on a deviation rate of 5%, the flow of the first cooling circuit (vehicle end) is 76-84 (the third flow range) is normal, and the flow of the second cooling circuit (pile end) is 19-21 is normal; assuming that the actual flow of the first cooling circuit (vehicle end) is 76, the flow of the second cooling circuit (pile end) is 100-76=24. At this time, the flow of the first cooling circuit (vehicle end) is normal, but the flow of the second cooling circuit (pile end) will be too large, so it is necessary to reduce the opening of the second cooling valve 41, that is, to reduce the flow of the second cooling circuit.

[0074] In the flow control method of a liquid cooling system described in this embodiment, in step S1, a power-on instruction is received, and then steps S2 and C1 are entered;

[0075] The method further includes step C1, the compressor 51 is in standby mode, and then proceeds to step C2;

[0076] Step C2, determine whether the temperature of the water tank 21 is between the first water temperature value and the second water temperature value, if so, proceed to step C3, if not, proceed to step C4;

[0077] Step C3, determine whether the total flow of the cooling side system is less than the flow setting value, if so, the compressor 51 starts at a speed of the first platform, if not, the compressor 51 starts at a speed of the second platform, wherein the first platform speed is less than the second platform speed;

[0078] Step C4, determine whether the temperature of the water tank 21 is greater than the second water temperature value, if so, the starting speed of the compressor 51 is the second platform speed, if not, return to step C1.

[0079] Specifically, in the flow control method of the liquid cooling system described in this embodiment, in the standby state, the liquid cooling system determines whether to perform internal circulation cooling or heating according to the temperature of the water tank 21. After the cold storage or heating is completed, the temperature of the water tank 21 is adjusted to the first water temperature value.

[0080] The second cooling circuit where the second heating device 42 is located is connected to the liquid cooling system by default. When the first heating device 32 is connected to the liquid cooling connector and connected to the first cooling circuit, the second heating device 42 will determine the corresponding liquid supply flow and liquid supply temperature according to the power parameters of the first heating device 32, and send the startup instruction, flow and temperature requirements to the liquid cooling system control box. The liquid cooling system is started to supply cold air and cool down. The starting platform speed of the compressor 51 is graded and controlled according to the temperature of the water tank 21 before startup and the target total flow requirement.

[0081] This embodiment can perform cold storage processing by adding a water tank 21 and a bypass pipe 23, keep the water temperature of the water tank 21 always in the appropriate cooling temperature range, and cooperate with measures such as a flow distribution mechanism for multi-channel cooling to solve the problems of single-channel liquid supply, poor adaptability to variable flow, long response time, and large fluctuations in liquid supply temperature in the existing liquid cooling system, improve cooling and heat dissipation efficiency and cooling reliability, and achieve the following effects:

[0082] Wide flow adjustment range: It can automatically match the cooling flow requirements of different heat load equipment without affecting the flow and heat exchange performance of the evaporator, reducing the risk of evaporator freezing and cracking when the evaporation temperature is lower than the low temperature alarm value at low flow.

[0083] Multi-channel load liquid supply: According to the different cooling flow requirements of different heating equipment, the flow meter automatically monitors and adjusts the speed of the circulation pump 22 and the opening of the electric valves of each branch, so that the heat dissipation automatically matches the cooling flow requirements of each load.

[0084] Quick response charging: The cooling side liquid cooling water system is provided with a large-capacity water tank 21 for cold storage. When the compressor 51 is not started or is in the frequency-increasing stage of just starting and cannot provide cooling capacity, the cooling side system can also provide cooling quickly, thereby reducing the delay waiting time of the heating equipment.

[0085] Stable liquid supply: The water tank 21 adds a bypass channel to realize internal circulation cooling and heating, which can ensure the stability of the temperature of the liquid supply; the cooling process makes the compressor 51 run at different platform initial speeds according to the different flow rates and water temperature combinations received to maintain the temperature of the water tank 21 constant and always in an appropriate temperature range, avoiding excessive fluctuations in the liquid supply temperature and preventing the battery life degradation problem caused by high-temperature liquid supply.

[0086] In the flow control method of a liquid cooling system described in this embodiment, in step A1, it is determined whether the evaporator temperature is less than the low temperature alarm value; if so, the bypass valve 25 is increased by 10% opening, and the process returns to step S4 after waiting for 10 seconds; in step S3, the circulation pump 22 operates at an initial speed, and the process enters step S4 after waiting for 5 seconds.

[0087] In the flow control method of a liquid cooling system described in this embodiment, the first flow interval is from the target total flow to the target total flow*flow deviation rate; the second flow interval is from the target branch flow to the target branch flow*flow deviation rate; the third flow interval is from the target first circuit flow to the target first circuit flow*flow deviation rate.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A liquid cooling system, characterized in that: It comprises a cold source side system and a cooling side system; a heat exchanger (1) is provided between the cold source side system and the cooling side system; the heat exchanger (1) is provided with a water pipeline (11); The cooling side system comprises a water tank (21), a circulation pump (22), a first cooling circuit, a second cooling circuit and a bypass pipeline (23); The first cooling circuit comprises a first cooling valve (31) and a first heating device (32); one end of the water tank (21) is connected to one end of a circulation pump (22); the other end of the circulation pump (22) is connected to one end of a water pipeline (11); the other end of the water pipeline (11) is connected to the other end of the water tank (21) through a bypass pipeline (23); the bypass pipeline (23) is provided with a bypass valve (25); the other end of the water pipeline (11) is connected to the other end of the water tank (21) after passing through the first heating device (32); the first cooling valve (31) is provided between the other end of the water pipeline (11) and the first heating device (32); The second cooling circuit comprises a second cooling valve (41) and a second heating device (42); the other end of the water pipe (11) is connected to the other end of the water tank (21) through the second heating device (42); the second cooling valve (41) is arranged between the other end of the water pipe (11) and the second heating device (42).

2. A liquid cooling system according to claim 1, characterized in that: The bypass valve (25) is provided with an electric heating element (24).

3. A liquid cooling system according to claim 1, characterized in that: A first flow meter (33) is provided between the other end of the water pipe (11) and the first cooling valve (31); and a second flow meter (43) is provided between the other end of the water pipe (11) and the second cooling valve (41).

4. A liquid cooling system according to claim 1, characterized in that: A first one-way valve (34) and a first filter (35) are provided between the other end of the water tank (21) and the first heating device (32); A second one-way valve (44) and a second filter (45) are provided between the other end of the water tank (21) and the second heating device (42).

5. A liquid cooling system according to claim 1, characterized in that: The cold source side system comprises a compressor (51), a condenser (52) and an electronic expansion valve (53); the heat exchanger (1) is provided with a fluorine path pipeline (12); one end of the compressor (51) is connected to one end of the condenser (52); the other end of the condenser (52) is connected to one end of the electronic expansion valve (53); the other end of the electronic expansion valve (53) is connected to the other end of the compressor (51) through the fluorine path pipeline (12).

6. A liquid cooling system according to claim 5, characterized in that: A drying filter (54) is provided between the electronic expansion valve (53) and the condenser (52); and a fan (55) is provided at the condenser (52).

7. A flow control method for a liquid cooling system according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step S1, receiving a power-on command, and then proceeding to step S2; Step S2, open the first cooling valve (31) and the second cooling valve (41), and close the bypass valve (25), and then enter step S3; Step S3, the circulating pump (22) operates at an initial speed, and then proceeds to step S4; Step S4, the circulating pump (22) performs automatic adjustment, and then proceeds to step S5; Step S5, determine whether the total flow of the cooling side system is within the first flow range, if so, proceed to step S6, if not, return to step S4; Step S6, determining whether the flow rates of each cooling circuit are within the second flow rate interval, if so, proceeding to step A1, if not, proceeding to step B1; Step A1, determine whether the evaporator temperature is less than the low temperature alarm value; if so, increase the opening of the bypass valve (25) and return to step S4; if not, proceed to step A2; Step A2, maintaining the opening of the first cooling valve (31), the opening of the second cooling valve (41) and the opening of the bypass valve (25), determining whether a shutdown command is received, if yes, proceeding to step A3, if no, returning to step S4; Step A3, close the first cooling valve (31) and the second cooling valve (41), open the bypass valve (25), and then proceed to step A4; Step A4, turn off the circulation pump (22), and then proceed to step A5; Step A5, closing the bypass valve (25); Step B1, determine whether the flow rate of the first cooling circuit is within the third flow rate interval, if yes, proceed to step B11, if no, proceed to step B12; Step B11, reduce the opening of the second cooling valve (41) and then return to step S4; Step B12: reduce the opening of the first cooling valve (31) and then return to step S4.

8. The flow control method of the liquid cooling system according to claim 7, characterized in that: In step A1, determine whether the evaporator temperature is less than the low temperature alarm value; if so, increase the bypass valve (25) by 10% and wait for 10 seconds before returning to step S4; in step S3, the circulation pump (22) operates at the initial speed and wait for 5 seconds before entering step S4.

9. The flow control method of the liquid cooling system according to claim 7, characterized in that: The first flow interval is target total flow - target total flow * flow deviation rate; the second flow interval is target branch flow - target branch flow * flow deviation rate; the third flow interval is target first loop flow - target first loop flow * flow deviation rate.

10. The flow control method of a liquid cooling system according to claim 7, characterized in that: In step S1, a power-on command is received, and then steps S2 and C1 are entered; The method further comprises step C1, the compressor (51) is in standby mode, and then proceeds to step C2; Step C2, determining whether the temperature of the water tank (21) is between the first water temperature value and the second water temperature value, if so, proceeding to step C3, if not, proceeding to step C4; Step C3, determining whether the total flow rate of the cooling side system is less than the flow rate setting value, if so, the compressor (51) starting speed is the first platform speed, if not, the compressor (51) starting speed is the second platform speed, wherein the first platform speed is less than the second platform speed; Step C4, determine whether the temperature of the water tank (21) is greater than the second water temperature value. If so, the starting speed of the compressor (51) is the second platform speed. If not, return to step C1.

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