Two-phase cooling system, cooling control method and device and storage medium

Abstract

The invention discloses a two-phase cooling system, a cooling control method and device and a storage medium. The system comprises a compressor refrigeration circulation loop and an equipment heat dissipation circulation loop which are independent from each other; a refrigerant in the compressor refrigeration circulation loop exchanges heat with a refrigerant in the equipment heat dissipation circulation loop through the evaporator, and the evaporator comprises a first heat exchange pipeline located in the equipment heat dissipation circulation loop and a second heat exchange pipeline located in the compressor refrigeration circulation loop; the equipment heat dissipation circulation loop comprises heating equipment, a liquid storage device and a three-way valve, an inlet of the three-way valve is connected to a refrigerant outlet of the heating equipment, a first outlet of the three-way valve is directly connected to the liquid storage device, and a second outlet of the three-way valve is connected to the liquid storage device through a first heat exchange pipeline. The compressor is used for indirect refrigeration and is not affected by the environment temperature, the flow of the two outlets of the three-way valve is adjusted according to actual requirements, the low liquid supply temperature is guaranteed, and the problem that the liquid supply temperature is high due to the fact that a two-phase cooling system is affected by the environment temperature is solved.

Description

Technical Field

[0001] The present invention relates to the field of cooling technology, and in particular to a two-phase cooling system, a cooling control method, a device and a storage medium. Background Art

[0002] With the rapid development of high-power chip technology, large antennas and electronic equipment in supercomputing centers have also seen extraordinary development in recent years. As a typical representative of the third-generation semiconductor materials, replacing traditional gallium arsenide chips with gallium nitride chips can increase chip efficiency from 30% to 50%, which is an important means to enhance the capabilities of high-power electronic chips.

[0003] While GaN chips improve the capabilities of high-power chips, they also bring about a significant increase in heat flux. Heat dissipation has become the biggest bottleneck restricting the further development and application of GaN power device technology.

[0004] Gas-liquid two-phase cooling technology is a new cooling technology that has emerged in recent years to adapt to high heat flux density heat dissipation. Figure 1 As shown, this technology utilizes the temperature-sensitive property of the refrigerant under normal pressure, and uses the refrigerant pump 1 to directly transport the liquid refrigerant to the interior of the heating device 2, so that the heating device 2 acts as an evaporator, and uses the latent heat of vaporization of the liquid refrigerant to evaporate into a gas to take away the heat of the heating device 2, and dissipate the heat through the condenser 3 and the fan 6. Due to the high latent heat heat exchange efficiency and good cooling effect, this technology can maximize the capabilities of gallium nitride devices and help improve the capabilities of the equipment. Figure 1 In the figure, 4 represents a liquid storage tank, 5 represents a flow meter, and 7 represents a drying filter.

[0005] However, the current two-phase cooling system relies entirely on the condensing fan to dissipate heat and is greatly restricted by the ambient temperature. Under high ambient temperatures (generally above 45°C), the liquid supply temperature will exceed 60°C, which still poses a considerable challenge to the temperature resistance of electronic components. Summary of the invention

[0006] Embodiments of the present invention provide a two-phase cooling system, a cooling control method, a device and a storage medium, so as to at least solve the problem in the prior art that the two-phase cooling system is affected by the ambient temperature and causes a high liquid supply temperature.

[0007] To solve the above technical problems, an embodiment of the present invention provides a two-phase cooling system, including: a compressor refrigeration cycle loop and a device heat dissipation cycle loop that are independent of each other;

[0008] The refrigerant in the compressor refrigeration cycle and the refrigerant in the equipment heat dissipation cycle are heat exchanged through an evaporator, and the evaporator includes a first heat exchange pipeline located in the equipment heat dissipation cycle and a second heat exchange pipeline located in the compressor refrigeration cycle;

[0009] The equipment heat dissipation circulation loop includes a heating device, a liquid reservoir and a three-way valve, the inlet of the three-way valve is connected to the refrigerant outlet of the heating device, the first outlet of the three-way valve is directly connected to the liquid reservoir, and the second outlet of the three-way valve is connected to the liquid reservoir through the first heat exchange pipeline.

[0010] Optionally, the equipment heat dissipation circulation loop further includes: a refrigerant pump, an inlet of which is connected to the liquid outlet of the liquid reservoir, and an outlet of which is connected to the refrigerant inlet of the heat generating equipment.

[0011] Optionally, a liquid level switch is provided at the bottom of the liquid reservoir, and the position of the liquid level switch is higher than the liquid outlet of the liquid reservoir. When the liquid level in the liquid reservoir is lower than a preset liquid level, the liquid level switch is disconnected and the refrigerant pump cannot be started.

[0012] Optionally, the inlet of the reservoir is located at the top of the reservoir.

[0013] Optionally, the compressor refrigeration cycle includes: a compressor, a condenser, a throttling element and an evaporator which are cyclically connected in sequence, and a condensing fan is arranged at the condenser.

[0014] The embodiment of the present invention further provides a cooling control method, which is applied to the two-phase cooling system described in the embodiment of the present invention, and the method includes:

[0015] Detect the temperature of the liquid supply flowing into the heating device;

[0016] According to the liquid supply temperature, the set temperature and the change of the liquid supply temperature, the opening of the three-way valve is adjusted to adjust the refrigerant flow rate flowing out of the heat generating device and entering the evaporator;

[0017] The frequency of the compressor is adjusted according to the liquid supply temperature and the set temperature, and the frequency of the condensing fan and the opening of the throttling element are adjusted according to the refrigerant pressure and refrigerant temperature at the compressor outlet, so that the liquid supply temperature reaches the set temperature.

[0018] Optionally, adjusting the opening of the three-way valve according to the liquid supply temperature, the set temperature and the change in the liquid supply temperature includes:

[0019] At each preset time interval, the three-way valve opening increment D is calculated based on the current liquid supply temperature, the set temperature and the change in the liquid supply temperature;

[0020] Use |D|% as the adjustment step;

[0021] The opening of the three-way valve is adjusted according to the adjustment step.

[0022] Optionally, the three-way valve opening increment D is calculated according to the current liquid supply temperature, the set temperature and the change of the liquid supply temperature, including:

[0023] Calculate the difference between the current liquid supply temperature and the set temperature to obtain the temperature difference ΔT;

[0024] Calculate the difference between the current liquid supply temperature and the liquid supply temperature before the preset time, and divide the difference by the preset time to obtain the temperature change rate R;

[0025] Calculate D=△T×a+R×b, where a represents the first coefficient and b represents the second coefficient.

[0026] Optionally, adjusting the opening of the three-way valve according to the adjustment step includes:

[0027] If the three-way valve opening increment D is greater than or equal to 0, the first outlet of the three-way valve is controlled to close to reduce the adjustment step;

[0028] If the three-way valve opening increment D is less than 0, the first outlet of the three-way valve is controlled to open larger than the adjustment step.

[0029] Optionally, before adjusting the opening of the three-way valve according to the adjustment step, the method further includes:

[0030] If the absolute value |D| of the three-way valve opening increment is greater than or equal to a preset threshold value A, A% is used as the adjustment step.

[0031] The embodiment of the present invention further provides a cooling control device, which is applied to the two-phase cooling system described in the embodiment of the present invention, and the device includes:

[0032] A detection module, used to detect the temperature of the liquid supply flowing into the heating device;

[0033] a first regulating module, configured to regulate the opening of the three-way valve according to the liquid supply temperature, the set temperature and the change of the liquid supply temperature, so as to adjust the refrigerant flow rate flowing out of the heat generating device and entering the evaporator;

[0034] The second regulating module is used to adjust the frequency of the compressor according to the liquid supply temperature and the set temperature, and to adjust the frequency of the condensing fan and the opening of the throttling element according to the refrigerant pressure and refrigerant temperature at the compressor outlet, so that the liquid supply temperature reaches the set temperature.

[0035] The embodiment of the present invention further provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the cooling control method described in the embodiment of the present invention is implemented.

[0036] By applying the technical solution of the present invention, a two-phase cooling system is provided with a compressor refrigeration cycle loop and an equipment heat dissipation cycle loop which are independent of each other. The refrigerant in the two loops can be indirectly heat exchanged through the evaporator and indirectly cooled by the compressor, so that a refrigerant with a lower temperature can be provided for equipment cooling, which is not affected by the ambient temperature. The flow rates of the two outlets of the three-way valve can be adjusted according to actual needs, so that a lower liquid supply temperature can be continuously provided to the heating equipment, thus solving the problem that the two-phase cooling system is affected by the ambient temperature and leads to a higher liquid supply temperature. The heating equipment is effectively cooled, which helps to improve the capacity of the heating equipment and extend the life of the electronic components in the heating equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of a two-phase cooling system of the prior art;

[0038] Figure 2 is a schematic diagram of a two-phase cooling system provided by an embodiment of the present invention;

[0039] Figure 3 is another schematic diagram of a two-phase cooling system provided by an embodiment of the present invention;

[0040] Figure 4 is a flow chart of a cooling control method provided by an embodiment of the present invention;

[0041] Figure 5 is a structural block diagram of a cooling control device provided by an embodiment of the present invention;

[0042] Description of reference numerals:

[0043] Heating device 10, liquid storage tank 20, three-way valve 30, refrigerant pump 40, compressor 50, condenser 60, throttling element 70, evaporator 80, flow meter 90, liquid level switch 21, sight glass 22, condensing fan 61, temperature sensor X, pressure sensor Y. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0047] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0048] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0049] Example 1

[0050] This embodiment provides a two-phase cooling system, which is cooled indirectly by a compressor, is not affected by the environment, and can continuously provide a relatively low liquid supply temperature to the heat generating device, for example, maintaining the liquid supply temperature below 30°C.

[0051] Figure 2 is a schematic diagram of a two-phase cooling system provided by an embodiment of the present invention, such as Figure 2 As shown, the two-phase cooling system includes: a compressor refrigeration cycle and an equipment heat dissipation cycle that are independent of each other. That is, the compressor refrigeration cycle and the equipment heat dissipation cycle are not connected, and refrigerants circulate in each of them.

[0052] The refrigerant in the compressor refrigeration cycle and the refrigerant in the equipment heat dissipation cycle are indirectly heat exchanged through the evaporator 80. The evaporator 80 includes a first heat exchange pipeline ( Figure 2 The upper pipe in the evaporator 80) and the second heat exchange pipe located in the compressor refrigeration cycle ( Figure 2 The lower line in the evaporator 80).

[0053] The equipment heat dissipation circulation loop includes a heating device 10, a liquid reservoir 20 and a three-way valve 30, the inlet of the three-way valve 30 is connected to the refrigerant outlet of the heating device 10, the first outlet of the three-way valve 30 is directly connected to the liquid reservoir 20, and the second outlet of the three-way valve 30 is connected to the liquid reservoir 20 through a first heat exchange pipeline.

[0054] In the heat dissipation circulation loop of the equipment, the liquid refrigerant enters the heating equipment 10, and the refrigerant undergoes phase change and evaporates in the heating equipment 10 to absorb heat, taking away the heat generated by the heating equipment 10. To ensure uniform cooling of a large area of ​​the heating equipment 10, the refrigerant is not completely evaporated in the heating equipment 10. When the refrigerant flows out of the heating equipment 10, it is a low-temperature gas-liquid two-phase mixture. The low-temperature gas-liquid two-phase mixture is divided into two paths through the three-way valve 30: one path directly returns to the liquid storage tank 20, and the other path enters the evaporator 80 of the compressor refrigeration circulation loop. After heat exchange with the refrigerant with a lower temperature in the evaporator 80, it becomes a pure liquid refrigerant and returns to the liquid storage tank 20. The liquid refrigerant in the liquid storage tank 20 is then sent to the heating equipment 10 to form a complete cycle.

[0055] In the compressor refrigeration cycle, the refrigerant exchanges heat with part of the gas-liquid two-phase mixture flowing out of the heating device 10 at the evaporator 80, and the heat generated by the heating device 10 enters the compressor refrigeration cycle, and then exchanges heat with the ambient air through the condenser 60, dissipating the heat to the ambient air, completing the heat dissipation cycle.

[0056] The two-phase cooling system of this embodiment is provided with a compressor refrigeration cycle loop and an equipment heat dissipation cycle loop which are independent of each other. The refrigerant in the two loops can be indirectly heat exchanged through the evaporator and indirectly cooled by the compressor, which can provide a refrigerant with a lower temperature for equipment cooling and is not affected by the ambient temperature. The flow rates of the two outlets of the three-way valve can be adjusted according to actual needs, so that a lower liquid supply temperature can be continuously provided to the heating equipment, which solves the problem of a high liquid supply temperature caused by the influence of ambient temperature on the two-phase cooling system, effectively cools down the heating equipment, helps to improve the capacity of the heating equipment, and prolongs the life of electronic components in the heating equipment.

[0057] The equipment heat dissipation circulation loop also includes: a refrigerant pump 40, whose inlet is connected to the liquid outlet of the liquid reservoir 20, and whose outlet is connected to the refrigerant inlet of the heating device 10. The refrigerant pump 40 is used to drive the liquid refrigerant in the liquid reservoir 20 to flow to the heating device 10. The refrigerant in the equipment heat dissipation circulation loop can be circulated normally through the refrigerant pump 40.

[0058] The liquid storage container 20 needs to have sufficient capacity and a certain height, for example, a slender and tall structure can be adopted. Figure 3As shown, a liquid level switch 21 is provided at the bottom of the liquid reservoir 20, and the position of the liquid level switch 21 is higher than the liquid outlet of the liquid reservoir 20 (i.e., the position of the suction port of the refrigerant pump 40). When the liquid level in the liquid reservoir 20 is lower than the preset liquid level, the liquid level switch 21 is disconnected, and the refrigerant pump 40 cannot be started. By providing the liquid level switch 21, this embodiment can ensure that the suction port of the refrigerant pump 40 is below the liquid level of the refrigerant stored in the liquid reservoir 20, thereby ensuring that the refrigerant sucked by the refrigerant pump is pure liquid, and preventing the refrigerant pump from being damaged after sucking in gas.

[0059] refer to Figure 2 and Figure 3 , the inlet of the liquid accumulator 20 is located at the top of the liquid accumulator 20. The gas-liquid mixture flowing out of the first outlet of the three-way valve 30, and the liquid refrigerant flowing out of the second outlet of the three-way valve 30 after heat exchange in the evaporator 80, both enter the liquid accumulator 20 from the top of the liquid accumulator 20, the gaseous refrigerant is stored in the upper part of the liquid accumulator 10, and the liquid refrigerant naturally falls into the lower part of the liquid accumulator 20, realizing gas-liquid separation. Inside the liquid accumulator 20, the refrigerant will be converted from gas to liquid as the temperature changes. For example, when the temperature drops, the gaseous refrigerant is automatically converted to liquid, and when the temperature rises, the liquid refrigerant is automatically converted to gas.

[0060] refer to Figure 3 The compressor refrigeration cycle includes: a compressor 50, a condenser 60, a throttling element 70 and an evaporator 80 which are connected in a circular manner, and a condensing fan 61 is provided at the condenser. The condensing fan frequency conversion can meet the demand for refrigeration throughout the year (ambient temperature range -40℃~55℃). The evaporator 80 is a cold source on the user side and a heat source on the compressor side. Indirect heat exchange through the evaporator can provide a refrigerant with a lower temperature.

[0061] The number of the heating device 10 can be at least one. The pure liquid refrigerant is metered by the flow meter 90 through the refrigerant pump 40 and then enters the main pipeline of the heating device 10 for uniform distribution (the premise of uniform distribution is pure liquid fluid). The refrigerant undergoes phase change, evaporates, and absorbs heat in the heating device 10, taking away the heat generated by the heating device 10. To ensure uniform cooling of a large area of ​​the heating device 10, the refrigerant is not completely evaporated in the heating device 10. When the refrigerant flows out of the heating device 10, it is a low-temperature gas-liquid two-phase mixture. The low-temperature gas-liquid two-phase mixture can enter the evaporator 80, exchange heat with the refrigerant at a lower temperature, and then become a pure liquid refrigerant and enter the liquid reservoir 20. The refrigerant pump 40 sucks out the pure liquid refrigerant in the liquid reservoir 20 and sends it to the heating device 10, forming a complete cycle. The heat generated by the heating device 10 enters the compressor refrigeration cycle after heat exchange in the evaporator 80, and then the condensing fan 61 in the compressor refrigeration cycle performs heat exchange between the ambient air and the refrigerant in the condenser 60, dissipating the heat to the ambient air, completing the heat dissipation cycle.

[0062] In a two-phase cooling system, temperature sensors and pressure sensors may be provided to detect relevant temperatures and pressures as a basis for control, for example, to detect the liquid supply temperature, the refrigerant pressure at the compressor outlet, the refrigerant temperature at the compressor outlet, etc.

[0063] The refrigerant pump 40 may operate at a fixed frequency to ensure the reliability of system operation. Of course, the frequency of the refrigerant pump 40 may also be adjusted according to actual needs, and this embodiment does not impose any limitation on this.

[0064] Example 2

[0065] This embodiment provides a cooling control method, which is applied to the two-phase cooling system described in the above embodiment.

[0066] Figure 4 is a flow chart of a cooling control method provided by an embodiment of the present invention, such as Figure 4 As shown, the method comprises the following steps:

[0067] S401, detecting the temperature of the liquid supplied to the heating device.

[0068] S402, adjusting the opening of the three-way valve according to the liquid supply temperature, the set temperature and the change in the liquid supply temperature to adjust the refrigerant flow rate flowing out of the heat generating device and entering the evaporator.

[0069] S403, adjusting the frequency of the compressor according to the liquid supply temperature and the set temperature, and adjusting the frequency of the condensing fan and the opening of the throttling element according to the refrigerant pressure and refrigerant temperature at the compressor outlet, so that the liquid supply temperature reaches the set temperature.

[0070] This embodiment sets up a compressor refrigeration cycle loop and an equipment heat dissipation cycle loop which are independent of each other. The refrigerant in the two loops can be indirectly heat exchanged through the evaporator and indirectly cooled by the compressor, which can provide a refrigerant with a lower temperature for equipment cooling and is not affected by the ambient temperature. In addition, the flow rates of the two outlets of the three-way valve can be adjusted according to actual needs to match the cooling capacity of the compressor with the heating value of the heating equipment, so that the cooling capacity can be accurately adjusted with the heat load, thereby continuously providing a lower liquid supply temperature to the heating equipment, solving the problem that the two-phase cooling system is affected by the ambient temperature and causes the liquid supply temperature to be higher, effectively cooling the heating equipment, helping to improve the capacity of the heating equipment and extend the life of electronic components in the heating equipment.

[0071] In one embodiment, the opening of the three-way valve is adjusted according to the liquid supply temperature, the set temperature and the change of the liquid supply temperature, including: calculating the three-way valve opening increment D according to the current liquid supply temperature, the set temperature and the change of the liquid supply temperature at each preset time interval; using |D|% as the adjustment step; adjusting the opening of the three-way valve according to the adjustment step. Among them, the preset time can be set according to actual conditions. The opening range of the three-way valve is generally 0 to 100%, 0 means fully closed, and 100% means fully open, so the percentage is used as the adjustment step.

[0072] This embodiment can know the flow requirements of the two branches of the three-way valve outlet according to the current liquid supply temperature, set temperature and liquid supply temperature change, so as to adjust the three-way valve according to actual needs and realize heat exchange control.

[0073] Further, the three-way valve opening increment D is calculated according to the current liquid supply temperature, the set temperature and the change of the liquid supply temperature, including: calculating the difference between the current liquid supply temperature and the set temperature to obtain the temperature difference △T; calculating the difference between the current liquid supply temperature and the liquid supply temperature before the preset time, and dividing it by the preset time to obtain the temperature change rate R; calculating D=△T×a+R×b, where a represents the first coefficient and b represents the second coefficient. In this embodiment, the three-way valve opening increment D obtained by the above calculation can reflect whether the current liquid supply temperature meets the demand. For example, D>0 indicates that the current liquid supply temperature is too high, and D<0 indicates that the current liquid supply temperature is too low.

[0074] Furthermore, the opening of the three-way valve is adjusted according to the adjustment step, including: if the three-way valve opening increment D is greater than or equal to 0, then the first outlet of the three-way valve is controlled to close the adjustment step; if the three-way valve opening increment D is less than 0, then the first outlet of the three-way valve is controlled to open the adjustment step. This embodiment adjusts the opening of the first outlet of the three-way valve based on the three-way valve opening increment D, thereby achieving heat exchange control to meet actual needs. Of course, the opening of the second outlet of the three-way valve can also be adjusted. When the total inflow of the three-way valve remains unchanged, the flow rate of one outlet decreases, and the flow rate of the other outlet naturally increases.

[0075] Considering that if the adjustment step of the three-way valve is too large, the adjustment of the compressor may not keep up, therefore, in one embodiment, before adjusting the opening of the three-way valve according to the adjustment step, it also includes: if the absolute value of the three-way valve opening increment |D| is greater than or equal to the preset threshold value A, then A% is used as the adjustment step. The preset threshold value A can be set according to actual conditions. This embodiment can ensure the stability of system adjustment by limiting the single maximum adjustment step.

[0076] For example, after the compressor is turned on, the opening of the three-way valve is adjusted every 10 seconds, and the adjustment step is calculated as follows:

[0077] D=△T×a+R×b,

[0078] △T=T – T0,

[0079] R=(T-T')×6, unit is ℃ / min.

[0080] Among them, D represents the increment of the three-way valve opening, △T represents the temperature difference (i.e. the actual supply temperature difference), R represents the supply temperature change rate, a represents the first coefficient, b represents the second coefficient, T represents the current supply temperature, T0 represents the set temperature, and T' represents the supply temperature 10 seconds ago. The value range of a is 0~10, and the default is 1. The value range of b is 0~5, and the default is 0.5. The value range of the set temperature T0 is 7℃~40℃, and the default is 21℃.

[0081] For example, the current liquid supply temperature T = 40 ° C, the liquid supply temperature 10 seconds ago T' = 42 ° C, the set temperature T0 = 30 ° C, a = 1, b = 0.5, D = (40-30) × 1 + (40-42) × 6 × 0.5 = 4, then the first outlet of the three-way valve is closed by 4%. If the current opening of the first outlet of the three-way valve is 50%, the adjusted opening is 46%.

[0082] The adjustment step is |D|%. If D≥0, it means that the current liquid supply temperature is too high. The opening of the first outlet of the three-way valve is closed by |D|%, reducing the flow directly back to the liquid storage tank and increasing the flow through the evaporator for heat exchange to reduce the liquid supply temperature. If D<0, it means that the current liquid supply temperature is too low. The opening of the first outlet of the three-way valve is opened by |D|%, increasing the flow directly back to the liquid storage tank and reducing the flow through the evaporator for heat exchange to increase the liquid supply temperature. If |D|≥5, adjust in steps of 5%. Thus, by adjusting the opening of the three-way valve outlet, the refrigerant flow from the equipment heat dissipation circulation loop into the evaporator of the compressor refrigeration circulation loop is adjusted, so that the heat generation of the heating equipment matches the cooling capacity of the compressor.

[0083] The control of the compressor, condensing fan and throttling element is explained below respectively.

[0084] (1) The frequency of the compressor is adjusted according to the liquid supply temperature and the set temperature, as follows:

[0085] If the liquid supply temperature is detected to be greater than the set temperature + 2°C for a certain period of time (such as 5 seconds), the compressor frequency will be increased according to the set time interval (such as 30 seconds), and each time it is increased by 5Hz;

[0086] If the liquid supply temperature is detected to be greater than the set temperature + 1°C for a certain period of time, the compressor frequency will be increased according to the set time interval, and each time it is increased by 2Hz;

[0087] If the supply temperature is detected to be lower than the set temperature -1°C for a certain period of time, the compressor frequency will be reduced according to the set time interval, and each time it will be reduced by 3Hz; if it drops to the lowest frequency for 2 consecutive minutes, the compressor will stop;

[0088] If the supply temperature is detected to be greater than or equal to the set temperature -1°C and less than or equal to the set temperature +1°C for a certain period of time, the compressor maintains the current frequency unchanged.

[0089] This implementation can effectively adjust the compressor frequency to meet the refrigeration demand.

[0090] (2) Adjust the frequency of the condensing fan according to the refrigerant pressure and refrigerant temperature at the compressor outlet, as follows:

[0091] The condensing temperature is obtained by converting the refrigerant pressure at the compressor outlet, and the condensing temperature is used as the adjustment target;

[0092] If the condensing temperature is greater than the set condensing temperature + 1°C, the condensing fan frequency is controlled to increase by 5Hz and adjusted every 30 seconds;

[0093] If the condensing temperature is lower than the set condensing temperature -1°C, the condensing fan frequency is controlled to decrease by 5Hz and adjusted every 30 seconds.

[0094] If the condensing temperature is greater than or equal to the set condensing temperature -1°C and less than or equal to the set condensing temperature +1°C, the condensing fan maintains the current frequency unchanged.

[0095] This embodiment can effectively adjust the frequency of the condensing fan to meet the cooling demand. A high condensation temperature indicates that the refrigerant in the condenser cannot be completely condensed into liquid. By increasing the frequency of the condensing fan, the heat exchange effect can be improved, thereby reducing the condensing temperature.

[0096] (3) Adjust the opening of the throttling element according to the refrigerant pressure and refrigerant temperature at the compressor outlet, as follows:

[0097] The condensing temperature is obtained by converting the refrigerant pressure at the compressor outlet, and the difference between the condensing temperature and the refrigerant temperature at the compressor outlet is calculated to obtain the exhaust gas superheat;

[0098] If the exhaust gas superheat is greater than the set exhaust gas superheat value + 1°C, the throttling element is opened by 5 steps and adjusted every 30 seconds;

[0099] If the exhaust gas superheat is less than the set exhaust gas superheat value -1°C, the throttling element is closed by 5 steps and adjusted every 30 seconds;

[0100] If the exhaust superheat is greater than or equal to the set exhaust superheat value -1°C and less than or equal to the set exhaust superheat value +1°C, the throttling element is controlled to maintain the current opening unchanged.

[0101] This embodiment can effectively adjust the opening of the throttling element to meet the cooling demand. A high exhaust superheat indicates that the refrigerant has not completely evaporated in the evaporator, resulting in a high temperature when entering the compressor, which will increase the load and energy consumption of the compressor. By opening the throttling element, the refrigerant flow rate can be increased, allowing more refrigerant to enter the evaporator, thereby reducing the exhaust superheat and improving the efficiency of the system.

[0102] By adjusting the compressor, condensing fan and throttling element in the compressor refrigeration cycle, the refrigeration demand can be met and the heat dissipation effect can be ensured.

[0103] The embodiment of the present invention provides a low supply liquid temperature two-phase cooling system that is indirectly cooled by a compressor and is not affected by the environment, and can maintain the supply liquid temperature below 30°C. The two-phase cooling technology has high latent heat exchange efficiency, so the temperature of the heating device (such as a gallium nitride chip) can be lowered without a very low supply liquid temperature, which can greatly reduce the heat transfer temperature difference between the device and the cooling medium, ensure that the heating device has good temperature characteristics, and the heating device can exert its maximum capacity, which helps to improve the capacity of the heating device.

[0104] The gas-liquid two-phase cooling system of this embodiment is simple in composition, can realize highly integrated design, has high cooling efficiency, and can meet application scenarios with greater cooling requirements. The refrigerant is directly sent into the heating device, and the refrigerant changes from liquid to gas while absorbing heat inside the heating device. The double-circulation setting is indirectly cooled by the compressor to ensure a low liquid supply temperature, which can reduce the refrigerant pump power consumption and the system working fluid storage capacity.

[0105] By selecting refrigerants with excellent thermal properties and environmental friendliness, the flow rate of the cooling medium can be reduced, and the size, weight, and power consumption of key components such as compressors, refrigerant pumps, transmission pipelines, and valves are greatly reduced, supporting the highly integrated and lightweight design of the cooling system, with size and weight reduced by more than 30% and power consumption reduced by more than 20%.

[0106] According to the life characteristics of electronic devices, the life will be halved for every 10°C rise in temperature. The low liquid supply temperature technology provided by the embodiment of the present invention can maintain the liquid supply temperature below 30°C, and the low liquid supply temperature can greatly extend the life of electronic devices.

[0107] Example 3

[0108] Based on the same inventive concept, this embodiment provides a cooling control device, which is applied to the two-phase cooling system described in the above embodiment and can be used to implement the cooling control method described in the above embodiment. The cooling control device can be implemented by software and / or hardware.

[0109] Figure 5 is a structural block diagram of a cooling control device provided by an embodiment of the present invention, such as Figure 5 As shown, the cooling control device includes:

[0110] A detection module 51, used to detect the temperature of the liquid supplied to the heating device;

[0111] A first regulating module 52, configured to regulate the opening of the three-way valve according to the liquid supply temperature, the set temperature and the change in the liquid supply temperature, so as to adjust the refrigerant flow rate flowing out of the heat generating device and entering the evaporator;

[0112] The second regulating module 53 is used to adjust the frequency of the compressor according to the liquid supply temperature and the set temperature, and to adjust the frequency of the condensing fan and the opening of the throttling element according to the refrigerant pressure and refrigerant temperature at the compressor outlet, so that the liquid supply temperature reaches the set temperature.

[0113] Optionally, the first adjustment module 52 includes:

[0114] A calculation unit, for calculating the three-way valve opening increment D at each preset time interval according to the current liquid supply temperature, the set temperature and the change of the liquid supply temperature;

[0115] A first determining unit, configured to use |D|% as an adjustment step;

[0116] The regulating unit is used to regulate the opening of the three-way valve according to the regulating step.

[0117] Optionally, the computing unit is specifically configured to:

[0118] Calculate the difference between the current liquid supply temperature and the set temperature to obtain the temperature difference ΔT;

[0119] Calculate the difference between the current liquid supply temperature and the liquid supply temperature before the preset time, and divide the difference by the preset time to obtain the temperature change rate R;

[0120] Calculate D=△T×a+R×b, where a represents the first coefficient and b represents the second coefficient.

[0121] Optionally, the adjusting unit is specifically configured to:

[0122] If the three-way valve opening increment D is greater than or equal to 0, the first outlet of the three-way valve is controlled to close to reduce the adjustment step;

[0123] If the three-way valve opening increment D is less than 0, the first outlet of the three-way valve is controlled to open larger than the adjustment step.

[0124] Optionally, the first adjustment module 52 further includes:

[0125] The second determining unit is used for, before adjusting the opening of the three-way valve according to the adjustment step, if the absolute value of the three-way valve opening increment |D| is greater than or equal to a preset threshold value A, using A% as the adjustment step.

[0126] The cooling control device can execute the cooling control method provided in the embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details not described in detail in this embodiment, please refer to the cooling control method provided in the embodiment of the present invention.

[0127] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0128] Example 4

[0129] This embodiment provides a non-volatile computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the cooling control method described in the above embodiment is implemented.

[0130] Example 5

[0131] This embodiment provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the cooling control method described in the above embodiment when executing the computer program.

[0132] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A two-phase cooling system, characterized in that: include: Independent compressor refrigeration cycle and equipment heat dissipation cycle; The refrigerant in the compressor refrigeration cycle and the refrigerant in the equipment heat dissipation cycle are heat exchanged through an evaporator, and the evaporator includes a first heat exchange pipeline located in the equipment heat dissipation cycle and a second heat exchange pipeline located in the compressor refrigeration cycle; The equipment heat dissipation circulation loop includes a heating device, a liquid reservoir and a three-way valve, the inlet of the three-way valve is connected to the refrigerant outlet of the heating device, the first outlet of the three-way valve is directly connected to the liquid reservoir, and the second outlet of the three-way valve is connected to the liquid reservoir through the first heat exchange pipeline.

2. The two-phase cooling system according to claim 1, characterized in that: The equipment heat dissipation circulation loop further includes: a refrigerant pump, an inlet of which is connected to the liquid outlet of the liquid accumulator, and an outlet of which is connected to the refrigerant inlet of the heat generating equipment.

3. The two-phase cooling system according to claim 2, characterized in that: A liquid level switch is arranged at the bottom of the liquid reservoir, and the position of the liquid level switch is higher than the liquid outlet of the liquid reservoir. When the liquid level in the liquid reservoir is lower than a preset liquid level, the liquid level switch is disconnected and the refrigerant pump cannot be started.

4. The two-phase cooling system according to claim 1, characterized in that: The inlet of the reservoir is located at the top of the reservoir.

5. The two-phase cooling system according to any one of claims 1 to 4, characterized in that: The compressor refrigeration cycle loop comprises: a compressor, a condenser, a throttling element and an evaporator which are cyclically connected in sequence, and a condensing fan is arranged at the condenser.

6. A cooling control method, characterized in that: Applied to the two-phase cooling system according to any one of claims 1 to 5, the method comprising: Detect the temperature of the liquid supply flowing into the heating device; According to the liquid supply temperature, the set temperature and the change of the liquid supply temperature, the opening of the three-way valve is adjusted to adjust the refrigerant flow rate flowing out of the heat generating device and entering the evaporator; The frequency of the compressor is adjusted according to the liquid supply temperature and the set temperature, and the frequency of the condensing fan and the opening of the throttling element are adjusted according to the refrigerant pressure and refrigerant temperature at the compressor outlet, so that the liquid supply temperature reaches the set temperature.

7. The method according to claim 6, characterized in that According to the liquid supply temperature, the set temperature and the change of the liquid supply temperature, the opening of the three-way valve is adjusted, including: At each preset time interval, the three-way valve opening increment D is calculated based on the current liquid supply temperature, the set temperature and the change in the liquid supply temperature; Use |D|% as the adjustment step; The opening of the three-way valve is adjusted according to the adjustment step.

8. The method according to claim 7, characterized in that The three-way valve opening increment D is calculated based on the current liquid supply temperature, set temperature and liquid supply temperature change, including: Calculate the difference between the current liquid supply temperature and the set temperature to obtain the temperature difference ΔT; Calculate the difference between the current liquid supply temperature and the liquid supply temperature before the preset time, and divide the difference by the preset time to obtain the temperature change rate R; Calculate D=△T×a+R×b, where a represents the first coefficient and b represents the second coefficient.

9. The method according to claim 7, characterized in that: Adjusting the opening of the three-way valve according to the adjustment step includes: If the three-way valve opening increment D is greater than or equal to 0, the first outlet of the three-way valve is controlled to close to reduce the adjustment step; If the three-way valve opening increment D is less than 0, the first outlet of the three-way valve is controlled to open larger than the adjustment step.

10. The method according to claim 7, characterized in that Before adjusting the opening of the three-way valve according to the adjustment step, the method further includes: If the absolute value |D| of the three-way valve opening increment is greater than or equal to a preset threshold value A, A% is used as the adjustment step.

11. A cooling control device, applied to the two-phase cooling system according to any one of claims 1 to 5, characterized in that: The device comprises: A detection module, used to detect the temperature of the liquid supply flowing into the heating device; a first regulating module, configured to regulate the opening of the three-way valve according to the liquid supply temperature, the set temperature and the change of the liquid supply temperature, so as to adjust the refrigerant flow rate flowing out of the heat generating device and entering the evaporator; The second regulating module is used to adjust the frequency of the compressor according to the liquid supply temperature and the set temperature, and to adjust the frequency of the condensing fan and the opening of the throttling element according to the refrigerant pressure and refrigerant temperature at the compressor outlet, so that the liquid supply temperature reaches the set temperature.

12. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the cooling control method according to any one of claims 6 to 10 is implemented.

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