Cooling units, control methods, electronic equipment and storage media

Abstract

This application provides a cooling unit, a control method, an electronic device, and a storage medium. The cooling unit includes a liquid supply pump, a refrigeration module, and a heat load. It further includes: a replenishment / discharge module, whose replenishment branch is connected between the liquid supply pump and the heat load for replenishing coolant to the cooling unit, and whose discharge branch is connected between its replenishment branch and the heat load for receiving coolant discharged from the cooling unit; and an electronic control module for acquiring the supply temperature difference of the cooling unit, and then adjusting the replenishment and discharge flow rates of the replenishment / discharge module according to the supply temperature difference, thereby regulating the supply temperature difference of the cooling unit. This application enables rapid offsetting of excess cooling capacity while improving temperature control accuracy and preventing thermal shock to the heat load.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to a cooling unit, control method, electronic equipment and storage medium. Background Technology

[0002] Existing cooling units (such as outdoor wide-temperature-range industrial cooling units) mainly consist of a liquid supply module, a liquid replenishment module, a refrigeration module, and a controller, and generally use 66% ethylene glycol antifreeze as the heat exchange medium.

[0003] Under high-temperature conditions, the compressor of the refrigeration module runs continuously at a high frequency. When the heat load suddenly decreases, due to the limitation of the hardware frequency reduction rate, the compressor cannot quickly reduce to the operating frequency that matches the current load, and continues to output excessive cooling capacity, causing the actual supply temperature of the coolant to be much lower than the set value, resulting in a large supply temperature difference. Summary of the Invention

[0004] This application provides a cooling unit, control method, electronic equipment, and storage medium to solve the problem in the prior art where, under high-temperature operating conditions, the heat load suddenly decreases, and due to the limitation of the hardware frequency reduction rate, the compressor cannot quickly adjust to the operating frequency that matches the current load, resulting in the continuous output of excessive cooling capacity, causing the actual supply temperature of the coolant to be far lower than the set value, leading to a large supply temperature difference.

[0005] In a first aspect, this application provides a cooling unit, which includes a liquid supply pump, a refrigeration module, and a heat load, and further includes: The coolant replenishment module has a replenishment branch connected between the coolant supply pump and the heat load for replenishing coolant to the cooling unit, and a drain branch connected between its replenishment branch and the heat load for receiving coolant drained from the cooling unit. An electrical control module, electrically connected to the replenishment and draining fluid module and the supply pump, is used to obtain the supply liquid temperature difference of the cooling unit, and adjust the replenishment flow rate and draining flow rate of the replenishment and draining fluid module according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit.

[0006] In one possible implementation, the rehydration fluid module includes: A water tank is used to store the coolant; A replenishment pump, a replenishment flow sensor, a replenishment temperature sensor, and a replenishment regulating valve are sequentially arranged on the replenishment branch. The replenishment pump, the replenishment flow sensor, the replenishment temperature sensor, and the replenishment regulating valve are all electrically connected to the electronic control module. A drain regulating valve, a drain flow sensor, and a drain temperature sensor are sequentially arranged on the drain branch, and the drain regulating valve, the drain flow sensor, and the drain temperature sensor are all electrically connected to the electronic control module.

[0007] In one possible implementation, the rehydration fluid module further includes: A heater is located at the bottom of the water tank and is electrically connected to the electronic control module.

[0008] In one possible implementation, the cooling unit further includes: A total liquid supply flow sensor is disposed between the refrigeration module and the heat load to detect the total liquid supply flow. The total liquid supply flow sensor is electrically connected to the electronic control module.

[0009] In one possible implementation, the cooling unit further includes: A plate heat exchanger, wherein its first inlet end is connected to the outlet end of the replenishment pump, its first outlet end is connected to the second inlet end of the water tank, its second inlet end is connected to the heat load, and its second outlet end is connected to the supply pump. A bypass regulating valve is installed on the pipeline between the first inlet end of the plate heat exchanger and the outlet end of the replenishment pump, and the bypass regulating valve is electrically connected to the electrical control module.

[0010] In one possible implementation, the cooling unit further includes: A third temperature sensor is disposed between the refrigeration module and the heat load for detecting the total liquid supply temperature. The third temperature sensor is electrically connected to the electronic control module. A fourth temperature sensor is disposed between the heat load and the replenishment / excretion fluid module to detect the total return fluid temperature. The fourth temperature sensor is electrically connected to the electronic control module.

[0011] Secondly, this application provides a control method applied to a cooling unit as described in any one of the first aspects above, the control method comprising: Obtain the supply liquid temperature difference of the cooling unit; The replenishment and discharge flow rates of the replenishment and discharge modules are adjusted according to the supply temperature difference, thereby regulating the supply temperature difference of the cooling unit.

[0012] In one possible implementation, adjusting the replenishment and discharge flow rates of the replenishment and discharge modules based on the supply temperature difference, thereby adjusting the supply temperature difference of the cooling unit, includes: Determine the range of the supply temperature difference; If the supply liquid temperature difference is greater than zero and less than or equal to the first threshold, the target replenishment flow rate is adjusted to the minimum flow rate, and then the drain valve is opened when the total return liquid pressure is greater than the preset pressure. If the supply liquid temperature difference is greater than the first threshold and less than or equal to the second threshold, then the target replenishment flow rate is increased, thereby reducing the supply liquid temperature difference; If the supply liquid temperature difference is greater than the second threshold, the target replenishment flow rate is adjusted to the maximum flow rate to reduce the supply liquid temperature difference.

[0013] In one possible implementation, after adjusting the replenishment flow rate of the replenishment / excretion fluid module according to the supply temperature difference, the control method further includes: The corresponding replenishment pump operating frequency is determined based on the target replenishment flow rate; wherein the replenishment pump operating frequency and the target replenishment flow rate satisfy a corresponding relationship; The operating frequency of the replenishment pump is corrected based on the difference between the actual replenishment flow rate and the target replenishment flow rate.

[0014] In one possible implementation, after adjusting the replenishment and discharge flow rates of the replenishment and discharge modules according to the supply temperature difference, thereby adjusting the supply temperature difference of the cooling unit, the control method further includes: Calculate the residual of the heat balance equation based on the supply temperature difference, total supply flow rate, total supply temperature, replenishment flow rate, replenishment temperature, discharge flow rate, and discharge temperature; Adjust the discharge flow rate according to the residual of the heat balance equation so that the residual of the heat balance equation approaches zero.

[0015] In one possible implementation, adjusting the discharge flow rate according to the residual of the heat balance equation, such that the residual of the heat balance equation approaches zero, includes: Determine the interval in which the residual of the heat balance equation lies; If the residual of the heat balance equation is greater than zero, then the discharge flow rate is controlled to decrease. If the residual of the heat balance equation is equal to zero, then the discharge flow rate is kept constant. If the residual of the heat balance equation is less than zero, then the discharge flow rate is increased.

[0016] In one possible implementation, the refrigeration module includes multiple refrigeration units, each refrigeration unit including a compressor. After adjusting the replenishment and discharge flow rates of the replenishment and discharge modules according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit, the method further includes: Calculate the actual heat load of the cooling unit; The cooling capacity of a single compressor is determined based on the actual heat load and the number of compressors. The target frequency of the compressor is determined based on the cooling capacity of the single compressor; wherein the target frequency of the compressor and the cooling capacity of the single compressor satisfy a one-to-one correspondence. Control each compressor to adjust to the compressor's target frequency.

[0017] In one possible implementation, before adjusting the replenishment and discharge flow rates of the replenishment and discharge modules based on the supply temperature difference, thereby adjusting the supply temperature difference of the cooling unit, the control method further includes: Determine whether the supply liquid temperature difference is greater than zero; If so, then control the compressor to increase its maximum frequency reduction speed, and then control the compressor to reduce its frequency according to the maximum frequency reduction speed; After the first preset time, determine whether the liquid supply temperature difference is still greater than zero; If not, maintain the current operating frequency and restore the initial maximum frequency reduction speed; If so, the replenishment flow rate and discharge flow rate of the replenishment and discharge modules are adjusted according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit.

[0018] In one possible implementation, before obtaining the supply liquid temperature difference of the cooling unit, the control method further includes: The initial temperature of the antifreeze in the water tank is obtained; the water tank is used to store the coolant, its outlet is connected to the replenishment branch, and its first inlet is connected to the drain branch; Calculate the average heat load over a second preset time period; The target temperature of the antifreeze is calculated based on the initial temperature of the antifreeze in the water tank and the average heat load. The heater at the bottom of the water tank is turned on to heat the antifreeze in the water tank to the target temperature.

[0019] In one possible implementation, the control method further includes: Detect ambient temperature; When the ambient temperature is lower than the first temperature threshold and the cooling unit is in emergency start-up mode, the cooling unit is controlled to enter the first heating cycle; When the ambient temperature is less than a first temperature threshold and the cooling unit has been idle in an environment less than the first temperature threshold for more than a third preset time, the cooling unit is controlled to enter the second heating cycle.

[0020] In one possible implementation, a replenishment pump and a replenishment regulating valve are provided on the replenishment branch, and a drain regulating valve is provided on the drain branch. Controlling the cooling unit to enter the first heating cycle includes: Turn off both the supply pump and the replenishment pump, and turn on the heater at the bottom of the water tank; After the temperature of the antifreeze in the water tank is heated to the second temperature threshold, the replenishment pump is turned on, the replenishment regulating valve on the replenishment branch is turned on, and the drain regulating valve on the drain branch is turned on. After the temperature at the inlet of the liquid supply pump reaches the third temperature threshold, the replenishment pump is controlled to shut down, while the liquid supply pump is controlled to turn on. Among them, the second temperature threshold > the third temperature threshold > the first temperature threshold.

[0021] In one possible implementation, controlling the cooling unit to enter the second heating cycle includes: Turn off both the supply pump and the replenishment pump, and turn on the heater at the bottom of the water tank; After the temperature of the antifreeze in the water tank is heated to the fourth temperature threshold, the replenishment pump is turned on, and the bypass regulating valve on the pipeline between the first inlet end of the plate heat exchanger and the outlet end of the replenishment pump is turned on; wherein, the first inlet end of the plate heat exchanger is connected to the outlet end of the replenishment pump, the first outlet end is connected to the second inlet end of the water tank, the second inlet end is connected to the heat load, and the second outlet end is connected to the supply pump; Once the temperature at the inlet of the liquid supply pump reaches the third temperature threshold, the liquid supply pump is controlled to start. Among them, the fourth temperature threshold > the third temperature threshold > the first temperature threshold.

[0022] In one possible implementation, after detecting the ambient temperature, the control method further includes: Determine whether the ambient temperature is less than or equal to a fifth temperature threshold; wherein the fifth temperature threshold is less than a first temperature threshold; If so, the cooling unit is controlled to enter the first heating cycle.

[0023] Thirdly, an electronic device is provided, comprising: a processor and a memory, the processor being configured to execute a control program stored in the memory to implement the control method described in any one of the second aspects above.

[0024] Fourthly, a storage medium is provided that stores one or more programs, which can be executed by one or more processors to implement the control method described in any one of the second aspects above.

[0025] Compared with the prior art, the above-mentioned technical solution provided in this application has the following advantages: The method provided in this application adjusts the supply liquid temperature difference of the cooling unit by adjusting the supply liquid flow rate and discharge liquid flow rate of the supply liquid module according to the supply liquid temperature difference when the heat load suddenly decreases under high temperature conditions. The supply liquid temperature difference is reduced by adjusting the supply liquid flow rate output by the supply liquid pump and the discharge liquid flow rate of the discharge regulating valve. It is not constrained by the compressor frequency reduction rate, avoiding the problem in the prior art where the compressor cannot quickly reduce to the operating frequency that matches the current load due to the limitation of the hardware frequency reduction rate, and continuously outputs excessive cooling capacity, resulting in a large supply liquid temperature difference. This method can quickly offset the excessive cooling capacity, improve the temperature control accuracy, and avoid the thermal load being subjected to thermal shock. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0029] Figure 1 A structural diagram of a cooling unit provided in an embodiment of this application; Figure 2 This is a structural diagram of another cooling unit provided in an embodiment of this application; Figure 3 A flowchart of the control method provided in the embodiments of this application; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0032] Example 1 To address the technical problem in existing technologies where, under high-temperature operating conditions, the heat load suddenly decreases, and due to the limitation of hardware frequency reduction rate, the compressor cannot quickly adjust to the operating frequency that matches the current load, resulting in the continuous output of excessive cooling capacity and causing the actual supply temperature of the coolant to be far lower than the set value, leading to a large supply temperature difference, this application provides a cooling unit that can quickly offset excessive cooling capacity, while improving temperature control accuracy and avoiding thermal shock to the heat load.

[0033] Figure 1 This is a structural diagram of a cooling unit provided in an embodiment of this application. Figure 1 As shown, the cooling unit includes a liquid supply pump 1, a refrigeration module 2, and a heat load 3 connected in sequence. The cooling unit also includes: The coolant replenishment module 4 has its outlet end connected between the coolant supply pump 1 and the heat load 3, and is used to replenish coolant to the cooling unit. Its drain branch is connected between its coolant replenishment branch and the heat load 3, and is used to receive the coolant drained from the cooling unit.

[0034] The electrical control module (not shown in the figure) is electrically connected to the replenishment and discharge module 4 and the supply pump 1 to adjust the replenishment flow rate and discharge flow rate of the replenishment and discharge module 4 according to the supply temperature difference, thereby adjusting the supply temperature difference of the cooling unit.

[0035] The technical solution provided in this application embodiment can adjust the replenishment flow rate and discharge flow rate of the replenishment and discharge modules according to the supply liquid temperature difference when the heat load suddenly decreases under high temperature conditions. This, in turn, adjusts the supply liquid temperature difference of the cooling unit. By adjusting the replenishment flow rate output by the replenishment pump and the discharge flow rate of the discharge regulating valve, the supply liquid temperature difference is reduced. This is not constrained by the compressor frequency reduction rate, avoiding the problem in the prior art where the compressor cannot quickly reduce to the operating frequency that matches the current load due to the limitation of the hardware frequency reduction rate, resulting in the continuous output of excessive cooling capacity and causing a large supply liquid temperature difference. This solution can quickly offset the excessive cooling capacity, improve temperature control accuracy, and prevent the heat load from being subjected to thermal shock.

[0036] Example 2 This embodiment provides another cooling unit. Figure 2 A structural diagram of another cooling unit provided in this application embodiment is shown below. Figure 2As shown, the replenishment / drainage module 4 includes: a water tank 41 for storing coolant, with its outlet end connected to a replenishment branch and its first inlet end connected to a drain branch; a replenishment pump 42, a replenishment flow sensor 43, a replenishment temperature sensor 44, and a replenishment regulating valve 45, which are sequentially arranged on the replenishment branch connected to the outlet end of the water tank 41, and are all electrically connected to the electronic control module; and a drain regulating valve 46, a drain flow sensor 47, and a drain temperature sensor 48, which are sequentially arranged on the drain branch connected to the first inlet end of the water tank 41, and are all electrically connected to the aforementioned electronic control module.

[0037] At low ambient temperatures, the viscosity of the antifreeze increases dramatically. Under extreme conditions of -45℃, the medium becomes gel-like. This increase in antifreeze viscosity causes a significant increase in the starting torque of the supply pump 1, generating an extremely large starting current. This impacts the pump's bearings, motor, and power supply, shortening the equipment's lifespan. Existing technologies lack preheating treatment for the antifreeze medium, relying solely on forced cold starts, resulting in poor reliability during low-temperature operation. To address these issues, the antifreeze needs to be heated. Therefore, the aforementioned replenishment / drainage module 4 also includes a heater 49, located at the bottom of the water tank 41, which is electrically connected to the aforementioned electrical control module.

[0038] Since the total liquid supply flow rate, liquid supply temperature difference, replenishment flow rate, replenishment temperature, and discharge flow rate and discharge temperature satisfy the heat balance equation, in order to accurately adjust the replenishment flow rate and liquid supply flow rate, it is also necessary to obtain the total liquid supply flow rate. Therefore, the above-mentioned cooling unit also includes: a total liquid supply flow rate sensor 5, which is installed between the refrigeration module 2 and the heat load to detect the total liquid supply flow rate. The total liquid supply flow rate sensor 5 is electrically connected to the above-mentioned electronic control module.

[0039] In order to achieve heat preservation and heating of the antifreeze discharged from the water tank 41, the above-mentioned cooling unit also includes: a plate heat exchanger 6, whose first inlet end is connected to the outlet end of the replenishment pump 42, whose first outlet end is connected to the second inlet end of the water tank 41, whose second inlet end is connected to the heat load, and whose second outlet end is connected to the liquid supply pump 1. A bypass regulating valve 61 is installed on the pipeline between the first inlet end of the plate heat exchanger 6 and the outlet end of the replenishment pump 42. The bypass regulating valve 61 is electrically connected to the aforementioned electrical control module.

[0040] like Figure 2 As shown, the refrigeration module 2 includes multiple refrigeration units 21, and each refrigeration unit 21 includes a compressor.

[0041] Actual heat load calculation formula: Q h =c×(Q 总 ×ρ)×(T)总回 -T 总供 In order to obtain the actual heat load of the cooling unit, in addition to the total liquid supply flow rate, the total liquid supply temperature and the total liquid return temperature are required. Therefore, the cooling unit mentioned above also includes: a third temperature sensor 7, which is set between the refrigeration module 2 and the heat load, for detecting the total liquid supply temperature; and a fourth temperature sensor 8, which is set between the heat load and the replenishment / drainage module 4, for detecting the total liquid return temperature.

[0042] Example 3 This embodiment provides a control method applied to the cooling unit described in the above embodiment. Figure 3 A flowchart of the control method provided in the embodiments of this application is shown below. Figure 3 As shown, the control method includes: S301, obtain the supply liquid temperature difference of the cooling unit.

[0043] In practice, the total liquid supply temperature of the cooling unit is detected by a third temperature sensor set between the refrigeration module and the heat load. Then, the electronic control module calculates the difference between the set liquid supply temperature and the total liquid supply temperature to obtain the liquid supply temperature difference of the cooling unit.

[0044] S302 adjusts the replenishment and discharge flow rates of the replenishment and discharge modules according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit.

[0045] Since the replenishment temperature is higher than the temperature of the antifreeze in the system, increasing the replenishment flow rate can affect the temperature of the antifreeze in the circulation system. The drain regulating valve can discharge the low-temperature antifreeze in the circulation system. Therefore, changing the drain flow rate can also affect the temperature of the antifreeze in the circulation system. Thus, by adjusting the replenishment flow rate and drain flow rate of the replenishment and drain modules, the supply temperature difference of the cooling unit can be adjusted.

[0046] The control method of this embodiment can adjust the replenishment flow rate and discharge flow rate of the replenishment and discharge modules according to the supply liquid temperature difference when the heat load suddenly decreases under high temperature conditions. This, in turn, adjusts the supply liquid temperature difference of the cooling unit. By adjusting the replenishment flow rate output by the replenishment pump and the discharge flow rate of the discharge regulating valve, the supply liquid temperature difference is reduced. This method is not constrained by the compressor frequency reduction rate, avoiding the problem in the prior art where the compressor cannot quickly reduce its operating frequency to match the current load due to the hardware frequency reduction rate limitation, resulting in a large supply liquid temperature difference caused by continuous output of excessive cooling capacity. This method can quickly offset the excessive cooling capacity, improve temperature control accuracy, and prevent the heat load from being subjected to thermal shock.

[0047] High-temperature antifreeze is pumped into the main circuit from the water tank, while low-temperature coolant is drained back into the water tank, creating a heat offset. The heat balance equation for the cooling unit is: c1×ρ1×Q 总 ×A = c²×ρ²×Q 补 ×(T补 -T 总供 ) c3×ρ3×Q 泄 ×(T 泄 -T 补 In the formula, c1 is the specific heat capacity of the antifreeze at the total supply temperature, ρ1 is the density of the antifreeze at the total supply temperature, A is the supply temperature difference, and Q is the density of the antifreeze at the total supply temperature. 总 C2 is the total supply flow rate, C2 is the specific heat capacity of the antifreeze at the replenishment temperature, ρ2 is the density of the antifreeze at the replenishment temperature, and Q is the total supply flow rate. 补 To replenish the fluid flow rate, T 补 For the replenishment temperature, T 总供 C3 is the total supply temperature, C3 is the specific heat capacity of the antifreeze at the drain temperature, ρ3 is the density of the antifreeze at the drain temperature, and Q is the total supply temperature. 泄 T is the discharge flow rate. 泄 This refers to the discharge temperature.

[0048] Since the replenishment fluid temperature is higher than the antifreeze temperature in the heat exchange circulation loop, increasing the replenishment fluid flow rate can raise the antifreeze temperature in the heat exchange circulation loop, thereby reducing the supply fluid temperature difference. When the supply fluid temperature difference is greater than zero and its absolute value is small, it indicates that the supply fluid temperature difference is small, and the target replenishment fluid flow rate can be adjusted to the minimum. Then, when the total return fluid pressure is greater than the preset pressure, the drain valve is opened to start draining fluid. When the supply fluid temperature difference is large, the replenishment fluid flow rate needs to be adjusted according to the size of the supply fluid temperature difference. When the supply fluid temperature difference is very large, the replenishment fluid flow rate needs to be adjusted to the maximum to adjust the supply fluid temperature difference as quickly as possible. Therefore, the replenishment and drain fluid flow rates of the replenishment and drain fluid modules are adjusted according to the supply fluid temperature difference. The method further regulates the supply liquid temperature difference of the cooling unit, including: determining the range of the supply liquid temperature difference; if the supply liquid temperature difference is greater than zero and less than or equal to a first threshold, controlling the target replenishment flow rate to the minimum flow rate, and then controlling the drain valve to open when the total return liquid pressure is greater than the preset pressure; if the supply liquid temperature difference is greater than the first threshold and less than or equal to a second threshold, increasing the target replenishment flow rate to raise the temperature of the antifreeze in the heat exchange circulation loop, thereby reducing the supply liquid temperature difference; if the supply liquid temperature difference is greater than the second threshold, controlling the target replenishment flow rate to the maximum flow rate to accelerate the rate at which the temperature of the antifreeze in the heat exchange circulation loop increases, thereby reducing the supply liquid temperature difference.

[0049] After determining the replenishment flow rate, it is also necessary to control the replenishment pump to output a corresponding flow rate. Therefore, after adjusting the replenishment flow rate of the replenishment module according to the supply temperature difference, the above control method also includes: determining the corresponding replenishment pump operating frequency according to the target replenishment flow rate; wherein, the replenishment pump operating frequency and the target replenishment flow rate satisfy a corresponding relationship; and correcting the replenishment pump operating frequency according to the difference between the actual replenishment flow rate and the target replenishment flow rate.

[0050] After coarsely adjusting the supply liquid temperature difference using the above method, fine-tuning is also necessary to ensure adjustment accuracy. Therefore, after adjusting the replenishment and discharge flow rates of the replenishment and discharge modules according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit, the above control method further includes: calculating the residual of the heat balance equation based on the supply liquid temperature difference, total supply liquid flow rate, total supply liquid temperature, replenishment flow rate, replenishment temperature, discharge flow rate, and discharge temperature; adjusting the discharge flow rate according to the residual of the heat balance equation so that the residual of the heat balance equation approaches zero, Δ=c1×ρ1×A×Q 总 -c2×ρ2(T 补 -T 总供 )+ c3×ρ3×Q 泄 ×(T 泄 -T 补 ).

[0051] To ensure that the residual of the heat balance equation approaches zero, the discharge flow rate is adjusted according to the residual of the heat balance equation to make the residual of the heat balance equation approach zero. This includes: determining the interval in which the residual of the heat balance equation is located; if the residual of the heat balance equation is greater than zero, then controlling the discharge flow rate to decrease; if the residual of the heat balance equation is equal to zero, then controlling the discharge flow rate to remain unchanged; if the residual of the heat balance equation is less than zero, then controlling the discharge flow rate to increase.

[0052] The refrigeration module includes multiple refrigeration units, each containing a compressor. After adjusting the supply temperature difference based on the replenishment flow rate of the replenishment and draining fluid module, it is also necessary to adjust the compressor frequency to match the actual heat load. Therefore, after adjusting the replenishment and draining fluid flow rates of the replenishment and draining fluid module according to the supply temperature difference, thereby adjusting the supply temperature difference of the cooling unit, the above control method further includes: calculating the actual heat load of the cooling unit; the actual heat load calculation formula is: Q h =c×(Q 总 ×ρ)×(T) 总回 -T 总供 ); where Q h The actual heat load of the load; T 总回 T represents the total return temperature. 总供 Here, c represents the total supply temperature; c represents the specific heat capacity of the antifreeze at the current total supply temperature; ρ represents the density of the antifreeze at the current total supply temperature; the cooling capacity of a single compressor is determined based on the actual heat load and the number of compressors; the target frequency of the compressor is determined based on the cooling capacity of the single compressor; each compressor is controlled to adjust to the above-mentioned target frequency; wherein, the target frequency of the compressor and the cooling capacity of a single compressor satisfy a one-to-one correspondence, and the above one-to-one correspondence is the single compressor frequency-cooling capacity calibration curve, which is pre-stored in the electronic control module and called when the compressor frequency needs to be controlled.

[0053] Before adjusting the replenishment and discharge flow rates of the replenishment and discharge modules described in the section, the supply temperature difference can be controlled by increasing the compressor's frequency reduction speed. Therefore, before adjusting the replenishment and discharge flow rates of the replenishment and discharge modules according to the supply temperature difference, thereby adjusting the supply temperature difference of the cooling unit, the above control method further includes: determining whether the supply temperature difference is greater than zero; if so, controlling the compressor's maximum frequency reduction speed to increase, and then controlling the compressor to reduce its frequency according to the maximum frequency reduction speed; after a first preset time, determining whether the supply temperature difference is still greater than zero; if not, maintaining the current operating frequency and restoring the initial maximum frequency reduction speed; if so, adjusting the replenishment and discharge flow rates of the replenishment and discharge modules according to the supply temperature difference, thereby adjusting the supply temperature difference of the cooling unit.

[0054] As described above, since the replenishment temperature is higher than the antifreeze temperature in the system, increasing the replenishment flow rate can affect the antifreeze temperature in the circulation system. Conversely, increasing the replenishment temperature can also increase the antifreeze temperature in the circulation system. Therefore, before obtaining the supply temperature difference of the cooling unit, the above control method further includes: obtaining the initial temperature of the antifreeze in the water tank; calculating the average heat load over a second preset time period; and calculating the target temperature of the antifreeze based on the initial temperature of the antifreeze in the water tank and the average heat load. T2 = (60Q) hp / c0×v×ρ0)+T1,where T1 is the initial temperature of the antifreeze in the water tank, T2 is the target temperature of the antifreeze, Q hp The average heat load is given by c0, the specific heat capacity of the antifreeze at room temperature, v is the volume of the antifreeze in the water tank, and ρ0 is the density of the antifreeze at room temperature. The heater at the bottom of the water tank is turned on to heat the antifreeze in the water tank to the target temperature.

[0055] At low ambient temperatures, the viscosity of antifreeze increases dramatically, reaching a gel-like state at -45℃. This increase in viscosity significantly raises the starting torque of the supply pump, generating an excessively large starting current. This impacts the pump's bearings, motor, and power supply, shortening equipment lifespan. Existing technologies lack preheating treatment for the antifreeze, relying solely on forced cold starts, resulting in poor reliability during low-temperature operation. To address these issues, the antifreeze needs to be heated. The control method further includes: detecting the ambient temperature; controlling the cooling unit to enter a first heating cycle when the ambient temperature is below a first temperature threshold and the cooling unit is in an emergency start-up state; and controlling the cooling unit to enter a second heating cycle when the ambient temperature is below the first temperature threshold and the cooling unit has been idle in an environment below the first temperature threshold for more than a third preset time.

[0056] Controlling the cooling unit to enter the first heating cycle includes: controlling both the supply pump and the replenishment pump to shut down, and controlling the heater at the bottom of the water tank to turn on; after the temperature of the antifreeze in the water tank is heated to a second temperature threshold, controlling the replenishment pump to turn on, controlling the replenishment regulating valve on the replenishment branch connected to the outlet end of the water tank to turn on, and controlling the drain regulating valve on the drain branch connected to the first inlet end of the water tank to turn on; after the temperature at the inlet end of the supply pump reaches a third temperature threshold, controlling the replenishment pump to shut down, and simultaneously controlling the supply pump to turn on; wherein, the second temperature threshold > the third temperature threshold > the first temperature threshold. The above control scheme achieves direct mixing preheating circulation, ensuring that the antifreeze in the tank is heated to a certain temperature before being output to the inlet of the supply pump via the replenishment pump. The supply pump is only activated after the antifreeze temperature at the supply pump inlet reaches a safe level, replenishing the cooling circulation system with antifreeze. This prevents excessively high antifreeze viscosity, which could generate excessive starting current and impact the bearings, motors, and power supply of the replenishment and supply pumps, thus extending their service life. This scheme enables rapid temperature rise and is suitable for emergency start-up scenarios.

[0057] Controlling the cooling unit to enter the second heating cycle includes: controlling both the supply pump and the replenishment pump to shut down, and controlling the heater at the bottom of the water tank to turn on; after the temperature of the antifreeze in the water tank is heated to a fourth temperature threshold, controlling the replenishment pump to turn on, and controlling the bypass regulating valve on the pipeline between the first inlet end of the plate heat exchanger and the outlet end of the replenishment pump to turn on; after the temperature at the inlet end of the supply pump reaches a third temperature threshold, controlling the supply pump to turn on; wherein, the fourth temperature threshold > the third temperature threshold > the first temperature threshold. The above control scheme achieves bypass preheating of the plate heat exchanger, ensuring that the antifreeze in the tank is heated to a certain temperature before being pumped into the plate heat exchanger. The plate heat exchanger then raises the antifreeze temperature at the inlet of the supply pump. Only after the antifreeze temperature at the supply pump inlet reaches a safe level is the supply pump activated, replenishing the cooling circulation system with antifreeze. This avoids excessively high antifreeze viscosity, which could generate excessive starting current and impact the bearings, motors, and power supply of the supply and supply pumps, thus extending their service life. This scheme achieves energy-saving and constant-temperature operation and is suitable for long-term low-temperature standby scenarios.

[0058] If the ambient temperature is under extreme conditions and is much lower than the first temperature threshold, the first heating cycle is executed first. Therefore, the control method further includes: determining whether the ambient temperature is less than or equal to a fifth temperature threshold; wherein the fifth temperature threshold is less than the first temperature threshold; if so, controlling the cooling unit to enter the first heating cycle.

[0059] Example 4 This embodiment provides another control method, including: I. When the heat load suddenly drops due to high ambient temperature, the following controls should be implemented: Step 1: Heat the antifreeze in the water tank using a heater.

[0060] Detect the current antifreeze temperature T1 in the water tank and calculate the load heat load Q within 1 minute. h Average Q hp Start the heater (preferably an electric heater) until the antifreeze temperature reaches T2, where T2 = (60°C). hp / c×v×ρ)+T1, where c is the specific heat capacity of the antifreeze at room temperature, v is the volume of the antifreeze in the water tank, and ρ is the density of the antifreeze at room temperature. Electric heating is stopped after step 4.

[0061] Step 2: Collect temperature parameters and calculate the supply liquid temperature difference.

[0062] The main control board periodically collects all sensor parameters in real time, presets the unit's liquid supply set temperature Ts, and calculates the liquid supply temperature difference: A = Ts - T 总供 A > 0 indicates that the current liquid supply temperature is lower than the set value, indicating overcooling, and the auxiliary temperature control circuit is activated; A ≤ 0 only maintains the compressor's normal frequency conversion regulation and does not activate the replenishment / drainage module.

[0063] Step 3: Establish the temperature regulation equilibrium equation based on energy conservation.

[0064] High-temperature antifreeze is pumped into the main circuit from the water tank, while low-temperature coolant is drained back into the water tank, creating a heat offset. The heat balance equation for the cooling unit is: c1×ρ1×Q 总 ×A = c²×ρ²×Q 补 ×(T 补 -T 总供 ) c3×ρ3×Q 泄 ×(T 泄 -T 补 In the formula, c1 is the specific heat capacity of the antifreeze at the total supply temperature, ρ1 is the density of the antifreeze at the total supply temperature, A is the supply temperature difference, and Q is the density of the antifreeze at the total supply temperature. 总 C2 is the total supply flow rate, C2 is the specific heat capacity of the antifreeze at the replenishment temperature, ρ2 is the density of the antifreeze at the replenishment temperature, and Q is the total supply flow rate. 补 To replenish the fluid flow rate, T 补 For the replenishment temperature, T 总供 C3 is the total supply temperature, C3 is the specific heat capacity of the antifreeze at the drain temperature, ρ3 is the density of the antifreeze at the drain temperature, and Q is the total supply temperature. 泄 T is the discharge flow rate. 泄 This refers to the discharge temperature.

[0065] Step 4: Based on the replenishment flow rate Q 补Drainage flow rate Q 泄 A layered PID dynamic collaborative adjustment method is used to regulate the liquid supply temperature difference.

[0066] 1. Coarse adjustment stage (variable frequency replenishment pump control Q) 补 ): 1) Based on the deviation A, the adjustment range is divided into three levels: Micro deviation range: 0 < A ≤ 2℃, the replenishment pump maintains the minimum variable frequency base flow rate Q. 补min Then determine the total return pressure P. 总回 > Check if P1 is true. If so, control the drain valve to open. In the medium deviation range (2℃ < A ≤ 8℃), the replenishment pump PID linearly increases the operating frequency and synchronously increases Q. 补 Inject more high-temperature antifreeze into the main circuit to quickly raise the total supply temperature; large deviation range: A>8℃ (sudden load drop, severe compressor overcooling), the replenishment pump rises to its rated maximum frequency, Q 补 Reaching maximum fluid resuscitation flow rate Q 补max This maximizes the introduction of high-temperature medium from the water tank to offset the cooling effect.

[0067] 2) Variable frequency linkage rules: The motherboard stores the replenishment pump frequency-flow calibration curve, given the target Q. 补 Directly outputs the corresponding strain frequency drive signal and reads the flow sensor Q in real time. 补 Perform closed-loop correction to eliminate pump flow drift.

[0068] 2. Fine-tuning process (electric regulating valve control Q) 泄 ): In Q 补 After coarse adjustment, the residual of the energy and heat balance equation is calculated as Δ = c1 × ρ1 × A × Q. 总 -c2×ρ2(T 补 -T 总供 )+c3×ρ3×Q 泄 ×(T 泄 -T 补 As an adjustment target: Δ > 0: insufficient heat input, reduce the opening of the electric valve, and reduce the discharge flow rate Q. 泄 Reduce the return of cryogenic liquid to the water tank and retain more high-temperature medium in the main circuit; Δ < 0: Excessive heat input, increase the opening of the electric valve, and increase the discharge flow rate Q. 泄 Discharge more low-temperature coolant to balance the total heat in the circuit; Δ=0: Maintain the current opening of the drain regulating valve, stabilize and converge the supply temperature difference, and enter steady-state temperature control.

[0069] 3. Overpressure safety interlock: When the pressure at the inlet of the liquid supply pump is detected to be higher than the pressure relief threshold, the electronic control forces the liquid relief regulating valve to open wider, prioritizing the pressure safety of the system before executing the temperature regulation logic.

[0070] Step 5: Control the target operating frequency of a single compressor.

[0071] The compressor target operating frequency P is dynamically coupled and calculated (three-variable coordination). During the synchronous operation of the liquid replenishment-temperature regulation loop, the main board calculates the actual heat load of the current equipment in real time, derives the compressor target operating frequency P to match the load, and synchronously limits the compressor frequency reduction limit to avoid excessive cooling. 1. Actual heat load calculation formula: Q h =c×(Q 总 ×ρ)×(T) 总回 -T 总供 ); Q h The actual heat load of the load; T 总回 T represents the total return temperature. 总供 ρ is the total supply temperature; c is the specific heat capacity of the antifreeze at the current temperature; ρ is the density of the antifreeze at the current temperature.

[0072] 2. Refrigeration module frequency mapping: The frequency-cooling capacity calibration curve of a single compressor is pre-stored in the electronic control module, based on the total heat load Q. h Divide by the number of refrigeration modules in operation to obtain the matching refrigeration capacity of a single compressor, and map the target operating frequency P of the output compressor.

[0073] 3. Frequency reduction rate coordination constraint: When the temperature control circuit is started (A>0), the main control board temporarily increases the maximum allowable frequency reduction rate of the compressor, breaks through the inherent frequency reduction limit of the hardware, and accelerates the compressor to reduce to P; if the frequency reduction rate of the compressor reaches the upper limit of the hardware and still cannot match the load, the replenishment and drainage module continues to work, and the liquid supply is suppressed by dual means.

[0074] 4. Steady-state convergence logic: When A≤0 and Δ=0, gradually reduce the frequency of the replenishment pump, reduce the opening of the drain regulating valve, exit the auxiliary temperature control, and restore the compressor's independent frequency conversion temperature control mode.

[0075] II. Low ambient temperature auxiliary start-up is controlled as follows: Set the ambient temperature threshold T e -35℃ is used as the start-up threshold, ambient temperature T e When the temperature is below -35℃, the low-temperature preheating start-up process is triggered, with two heating implementation paths, and the electronic control automatically selects the optimal one.

[0076] Mode 1: Direct-mix preheating cycle (rapid temperature rise, suitable for emergency start-up scenarios) 1) After the unit is powered on, do not start the liquid supply pump; start the heater at the bottom of the water tank to heat the ethylene glycol antifreeze in the water tank to the preheating range of 3℃~10℃.

[0077] 2) Close the bypass regulating valve, open the replenishing regulating valve, and start the variable frequency replenishing pump to operate at a medium-low frequency to continuously pump the high-temperature antifreeze from the water tank into the main circulation pipeline; at the same time, slightly open the drain regulating valve to drain the low-temperature viscous medium in the pipeline back to the water tank and mix and dilute it with the high-temperature medium.

[0078] 3) Continuously circulate and replace for 30–180 seconds, and collect the inlet medium temperature T of the supply pump in real time. i When T i When the temperature is ≥-30℃ (threshold for significant viscosity reduction), the replenishment pump should be stopped and replaced with water for replenishment and circulation.

[0079] 4) Start the liquid supply pump. At this time, the viscosity of the medium in the pipeline is significantly reduced, the starting torque and inrush current are greatly reduced, and the low-impact start is completed; the unit enters normal temperature control operation.

[0080] Mode 2: Plate heat exchanger bypass preheating (energy-saving constant temperature, suitable for long-term low-temperature standby scenarios) 1) The water tank heater maintains the antifreeze at a constant temperature of about 5°C; open the bypass regulating valve, close the replenishment regulating valve, and the replenishment pump drives the high-temperature antifreeze to flow through the plate heat exchanger.

[0081] 2) The plate heat exchanger conducts heat to continuously heat the low-temperature medium at the inlet of the liquid supply pump, thereby increasing the local medium temperature at the pump suction end and reducing the viscosity of the inlet medium.

[0082] 3) The lower the ambient temperature, the more the electronic control system will increase the operating frequency of the replenishment pump, increase the circulation flow on the heat exchanger side, and enhance the heat exchange efficiency. When the temperature at the inlet of the supply pump is stable above -30℃, the supply pump will be started directly without the need for whole-machine medium replacement, resulting in lower energy consumption.

[0083] Low-temperature start-up protection interlock logic: 1. If the ambient temperature is -45℃, the whole machine medium replacement mode 1 will be executed first, and the preheating cycle time will be extended to 180s; 2. The water tank level and system pressure will be monitored in real time during the preheating process. If the water tank level is too low or the pipeline pressure exceeds the limit, the replenishment pump heating cycle will be stopped and an alarm will be triggered; 3. After the supply pump starts, the motor starting current will be continuously monitored. If the inrush current exceeds the standard, the preheating cycle will be restarted for secondary heating to protect the supply pump body and motor.

[0084] In summary, the entire machine's full-temperature-range coordinated control logic mainboard executes two sets of control logics in a time-sharing and parallel manner: 1) Ambient temperature ≥ -35℃ normal temperature range: turn off the low temperature preheating function, only monitor the liquid supply temperature difference A in real time, start the liquid replenishment and leakage dual-loop dynamic temperature adjustment as needed, and synchronously link the compressor frequency P adjustment.

[0085] 2) Low temperature range of ambient temperature < -35℃: The low temperature preheating start-up process is forcibly executed before the unit is started; during normal operation of the unit, if there is a sudden drop in heat load or excessive cooling of the liquid supply, the replenishment and discharge module and the compressor frequency reduction coordinated control are simultaneously superimposed to achieve high-precision temperature control in low temperature environment.

[0086] 3) All-condition safety safeguards: When pressure or liquid level exceeds the limit, the protection action is executed first, and then the temperature regulation logic is executed.

[0087] The inventive point of this invention lies in: 1. A dual-loop assisted heating and coordinated temperature control scheme based on energy conservation is proposed to match the load heat load and the antifreeze temperature in the water tank in real time. Temperature and flow sensors are installed in the main supply and return lines, replenishment branches, and drain branches. The volume and temperature of the antifreeze in the water tank are collected in real time to calculate the required temperature rise of the antifreeze in the tank. The total supply flow rate Q is collected in real time. 总 Total liquid supply temperature T 总供 Total return liquid temperature T 总回 Fluid replenishment flow rate Q 补 , replenishment temperature T 补 Drainage flow rate Q 泄 , discharge temperature T 泄 ; Calculate the supply liquid temperature difference deviation A = Ts - T 总供 If A > 0, the supply fluid is deemed too cold. The replenishment fluid temperature control circuit is activated, and an energy balance formula is established. The variable frequency replenishment pump is adjusted in stages to achieve coarse heat adjustment: based on the temperature difference A, the pump frequency is linearly adjusted to change Q within small, medium, and large deviation ranges. 补 Fine-tune the discharge flow rate Q using the discharge regulating valve. 泄 To eliminate residual heat balance, the compressor frequency is synchronously controlled: the actual heat load is calculated from the total supply and return liquid temperature difference and the total flow rate, and the compressor target frequency P is converted; in temperature control mode, the compressor frequency reduction rate is temporarily relaxed to doubly suppress overcooling. When the compressor reaches the target frequency and the temperature difference returns to normal, the auxiliary temperature control is automatically discontinued.

[0088] 2. The dual-mode low-temperature medium preheating auxiliary start-up control logic uses -35℃ as the ambient temperature threshold. Before low-temperature start-up, a preheating process is executed, and two modes are automatically switched: Direct mixing and displacement preheating (extreme low-temperature rapid start-up) heats the antifreeze in the water tank, and the variable frequency replenishment pump pumps the high-temperature medium into the main circuit, while the low-temperature viscous medium is simultaneously discharged from the pipeline back to the water tank for mixing and displacement; the supply pump is started after the pump inlet medium temperature rises to -30℃, adapting to extreme environments of -45℃. Plate heat exchanger bypass preheating (low-temperature standby energy-saving mode) uses the replenishment pump to drive the high-temperature antifreeze to circulate separately in the heat exchanger, continuously exchanging heat on the outer wall of the supply pump inlet pipeline without replacing the medium of the whole machine; the lower the ambient temperature, the higher the flow rate of the replenishment pump is automatically increased to enhance heat exchange, resulting in lower energy consumption, suitable for long-term low-temperature standby scenarios.

[0089] Beneficial effects: 1. High temperature control accuracy and fast response: Based on the energy conservation model, the liquid supply flow of the replenishing pump and the liquid discharge flow of the drain regulating valve are linked and controlled. It is not constrained by the compressor frequency reduction rate, quickly offsets excess cooling capacity, accurately controls the supply liquid temperature difference, and avoids thermal shock to the heat load.

[0090] 2. Stable operation across the entire temperature range, protecting the pump body and electrical components. Provides a low-temperature preheating mode to reduce the viscosity of the medium in advance, significantly reducing the pump starting torque and inrush current, reducing the failure rate of the motor, bearings, and power supply, and achieving reliable operation in a wide temperature range of -45℃ to 55℃.

[0091] 3. Through multi-variable collaborative control, lower operating energy consumption is achieved. The actual heat load is calculated in real time based on the supply and return liquid parameters, and the target frequency of the compressor is accurately matched; the bypass preheating of the low-temperature plate heat exchanger consumes less energy than whole-machine medium replacement, thus balancing temperature control and energy saving.

[0092] 4. Low retrofit cost: The existing hardware is reused to make full use of the unit's existing variable frequency replenishment pump, water tank, and drain regulating valve. Only the flow sensor, temperature sensor, and bypass regulating valve need to be added, and the electrical control program needs to be upgraded to implement the project. The engineering retrofit investment is small.

[0093] Example 5 This embodiment provides an electronic device. Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application, such as... Figure 4 As shown, the electronic device includes a processor 111, a communication interface 112, a memory 113, and a communication bus 114. The processor 111, communication interface 112, and memory 113 communicate with each other via the communication bus 114. Memory 113 is used to store computer programs; In one embodiment of this application, the processor 111, when executing a program stored in the memory 113, implements the control method provided in any of the foregoing method embodiments.

[0094] Example 6 This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the control method provided in any of the foregoing method embodiments.

[0095] The unit embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0096] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0097] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0098] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A cooling unit, characterized in that, The cooling unit includes a liquid supply pump, a refrigeration module, and a heat load. The cooling unit also includes: The coolant replenishment module has a replenishment branch connected between the coolant supply pump and the heat load for replenishing coolant to the cooling unit, and a drain branch connected between its replenishment branch and the heat load for receiving coolant drained from the cooling unit. An electrical control module, electrically connected to the replenishment and draining fluid module and the supply pump, is used to obtain the supply liquid temperature difference of the cooling unit, and adjust the replenishment flow rate and draining flow rate of the replenishment and draining fluid module according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit.

2. The cooling unit according to claim 1, characterized in that, The rehydration / excretion module includes: A water tank for storing the coolant, with its outlet connected to the replenishment branch and its first inlet connected to the drain branch; A replenishment pump, a replenishment flow sensor, a replenishment temperature sensor, and a replenishment regulating valve are sequentially arranged on the replenishment branch. The replenishment pump, the replenishment flow sensor, the replenishment temperature sensor, and the replenishment regulating valve are all electrically connected to the electronic control module. A drain regulating valve, a drain flow sensor, and a drain temperature sensor are sequentially arranged on the drain branch, and the drain regulating valve, the drain flow sensor, and the drain temperature sensor are all electrically connected to the electronic control module.

3. The cooling unit according to claim 2, characterized in that, The rehydration fluid module also includes: A heater is located at the bottom of the water tank and is electrically connected to the electronic control module.

4. The cooling unit according to claim 1, characterized in that, The cooling unit also includes: A total liquid supply flow sensor is disposed between the refrigeration module and the heat load to detect the total liquid supply flow. The total liquid supply flow sensor is electrically connected to the electronic control module.

5. The cooling unit according to claim 2, characterized in that, The cooling unit also includes: A plate heat exchanger, wherein its first inlet end is connected to the outlet end of the replenishment pump, its first outlet end is connected to the second inlet end of the water tank, its second inlet end is connected to the heat load, and its second outlet end is connected to the supply pump. A bypass regulating valve is installed on the pipeline between the first inlet end of the plate heat exchanger and the outlet end of the replenishment pump, and the bypass regulating valve is electrically connected to the electrical control module.

6. The cooling unit according to claim 1, characterized in that, The cooling unit also includes: A third temperature sensor is disposed between the refrigeration module and the heat load for detecting the total liquid supply temperature. The third temperature sensor is electrically connected to the electronic control module. A fourth temperature sensor is disposed between the heat load and the replenishment / excretion fluid module to detect the total return fluid temperature. The fourth temperature sensor is electrically connected to the electronic control module.

7. A control method applied to a cooling unit according to any one of claims 1 to 6, characterized in that, The control method includes: Obtain the supply liquid temperature difference of the cooling unit; The replenishment and discharge flow rates of the replenishment and discharge modules are adjusted according to the supply temperature difference, thereby regulating the supply temperature difference of the cooling unit.

8. The method according to claim 7, characterized in that, The step of adjusting the replenishment and discharge flow rates of the replenishment and discharge modules based on the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit, includes: Determine the range of the supply temperature difference; If the supply liquid temperature difference is greater than zero and less than or equal to the first threshold, the target replenishment flow rate is adjusted to the minimum flow rate, and then the drain valve is opened when the total return liquid pressure is greater than the preset pressure. If the supply liquid temperature difference is greater than the first threshold and less than or equal to the second threshold, then the target replenishment flow rate is increased, thereby reducing the supply liquid temperature difference; If the supply liquid temperature difference is greater than the second threshold, the target replenishment flow rate is adjusted to the maximum flow rate to reduce the supply liquid temperature difference.

9. The method according to claim 8, characterized in that, After adjusting the replenishment flow rate of the replenishment / excretion fluid module according to the supply temperature difference, the control method further includes: The corresponding replenishment pump operating frequency is determined based on the target replenishment flow rate; wherein the replenishment pump operating frequency and the target replenishment flow rate satisfy a corresponding relationship; The operating frequency of the replenishment pump is corrected based on the difference between the actual replenishment flow rate and the target replenishment flow rate.

10. The method according to claim 9, characterized in that, After adjusting the replenishment and discharge flow rates of the replenishment and discharge modules according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit, the control method further includes: Calculate the residual of the heat balance equation based on the supply temperature difference, total supply flow rate, total supply temperature, replenishment flow rate, replenishment temperature, discharge flow rate, and discharge temperature; Adjust the discharge flow rate according to the residual of the heat balance equation so that the residual of the heat balance equation approaches zero.

11. The method according to claim 10, characterized in that, The step of adjusting the discharge flow rate according to the residual of the heat balance equation, so that the residual of the heat balance equation approaches zero, includes: Determine the interval in which the residual of the heat balance equation lies; If the residual of the heat balance equation is greater than zero, then the discharge flow rate is controlled to decrease. If the residual of the heat balance equation is equal to zero, then the discharge flow rate is kept constant. If the residual of the heat balance equation is less than zero, then the discharge flow rate is increased.

12. The method according to claim 7, characterized in that, The refrigeration module includes multiple refrigeration units, each refrigeration unit including a compressor. After adjusting the replenishment and discharge flow rates of the replenishment and discharge modules according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit, the method further includes: Calculate the actual heat load of the cooling unit; The cooling capacity of a single compressor is determined based on the actual heat load and the number of compressors. The target frequency of the compressor is determined based on the cooling capacity of the single compressor; wherein the target frequency of the compressor and the cooling capacity of the single compressor satisfy a one-to-one correspondence. Control each compressor to adjust to the target compressor frequency.

13. The method according to claim 12, characterized in that, Before adjusting the replenishment and discharge flow rates of the replenishment and discharge modules based on the supply temperature difference to regulate the supply temperature difference of the cooling unit, the control method further includes: Determine whether the supply liquid temperature difference is greater than zero; If so, then control the compressor to increase its maximum frequency reduction speed, and then control the compressor to reduce its frequency according to the maximum frequency reduction speed; After the first preset time, determine whether the liquid supply temperature difference is still greater than zero; If not, maintain the current operating frequency and restore the initial maximum frequency reduction speed; If so, the replenishment flow rate and discharge flow rate of the replenishment and discharge modules are adjusted according to the supply liquid temperature difference, thereby adjusting the supply liquid temperature difference of the cooling unit.

14. The method according to claim 7, characterized in that, Before obtaining the supply liquid temperature difference of the cooling unit, the control method further includes: The initial temperature of the antifreeze in the water tank is obtained; the water tank is used to store the coolant, its outlet is connected to the replenishment branch, and its first inlet is connected to the drain branch; Calculate the average heat load over a second preset time period; The target temperature of the antifreeze is calculated based on the initial temperature of the antifreeze in the water tank and the average heat load. The heater at the bottom of the water tank is turned on to heat the antifreeze in the water tank to the target temperature.

15. The method according to claim 14, characterized in that, The control method further includes: Detect ambient temperature; When the ambient temperature is lower than the first temperature threshold and the cooling unit is in emergency start-up mode, the cooling unit is controlled to enter the first heating cycle; When the ambient temperature is less than a first temperature threshold and the cooling unit has been idle in an environment less than the first temperature threshold for more than a third preset time, the cooling unit is controlled to enter a second heating cycle.

16. The method according to claim 15, characterized in that, A replenishment pump and a replenishment regulating valve are installed on the replenishment branch, and a drain regulating valve is installed on the drain branch. Controlling the cooling unit to enter the first heating cycle includes: The supply pump and replenishment pump are both turned off, and the heater at the bottom of the water tank is turned on. After the temperature of the antifreeze in the water tank is heated to the second temperature threshold, the replenishment pump is turned on, the replenishment regulating valve on the replenishment branch is turned on, and the drain regulating valve on the drain branch is turned on. After the temperature at the inlet of the liquid supply pump reaches the third temperature threshold, the replenishment pump is controlled to shut down, while the liquid supply pump is controlled to turn on. Among them, the second temperature threshold > the third temperature threshold > the first temperature threshold.

17. The method according to claim 16, characterized in that, The control of the cooling unit to enter the second heating cycle includes: The supply pump and replenishment pump are both turned off, and the heater at the bottom of the water tank is turned on. After the temperature of the antifreeze in the water tank is heated to the fourth temperature threshold, the replenishment pump is turned on, and the bypass regulating valve on the pipeline between the first inlet end of the plate heat exchanger and the outlet end of the replenishment pump is turned on; wherein, the first inlet end of the plate heat exchanger is connected to the outlet end of the replenishment pump, the first outlet end is connected to the second inlet end of the water tank, the second inlet end is connected to the heat load, and the second outlet end is connected to the supply pump; Once the temperature at the inlet of the liquid supply pump reaches the third temperature threshold, the liquid supply pump is controlled to start. Among them, the fourth temperature threshold > the third temperature threshold > the first temperature threshold.

18. The method according to claim 15, characterized in that, After detecting the ambient temperature, the control method further includes: Determine whether the ambient temperature is less than or equal to a fifth temperature threshold; wherein the fifth temperature threshold is less than a first temperature threshold; If so, the cooling unit is controlled to enter the first heating cycle.

19. An electronic device, characterized in that, include: A processor and a memory, the processor being configured to execute a control program stored in the memory to implement the control method according to any one of claims 7-18.

20. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the control method according to any one of claims 7-18.

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