Temperature control method for liquid cooling system

Abstract

The application discloses a temperature control method of a liquid cooling system, which comprises the following steps: obtaining a set value of a water supply temperature; operating a main pump; operating a secondary pump; operating a compressor; opening an expansion valve; obtaining suction temperature, low-pressure pressure, superheat and saturation temperature of the compressor; adjusting the opening degree of the expansion valve according to the suction temperature, the low-pressure pressure, the superheat and the saturation temperature; obtaining an actual value of the water supply temperature; and controlling the opening or closing of a refrigeration electromagnetic valve, a cold gas bypass electromagnetic valve and a hot gas bypass electromagnetic valve of the compressor according to the temperature difference between the set value of the water supply temperature and the actual value of the water supply temperature. By adjusting the opening degree of the expansion valve, the refrigerating capacity of the compressor can be finely adjusted when the compressor is refrigerating, so that the temperature control precision is improved. By combining the opening degree control of the expansion valve with the opening or closing of the refrigeration electromagnetic valve, the cold gas bypass electromagnetic valve and the hot gas bypass electromagnetic valve, the precision control of the refrigerating capacity of the compressor can be improved, and the requirement of high-precision temperature control can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid cooling system temperature control, and particularly relates to a temperature control method of a liquid cooling system. BACKGROUND

[0002] In related technologies, the demand for high-performance laser equipment in the fields of material processing, medical treatment, scientific research and the like is continuously increasing. When the laser works, heat is generated, so that the temperature of the laser is increased. According to the working characteristics of the laser, the wavelength will drift with the change of the temperature, so that the emission power of the laser is changed, thereby causing the instability of the entire emission system, and even causing the emission system to be unable to work. Therefore, high-precision temperature control of the laser must be performed to enable the laser to stably and normally work. The current liquid cooling equipment controls the temperature of the laser by controlling the temperature of a cold storage water tank, and the temperature control precision is generally ±3.0℃, which cannot meet the requirement of high-precision temperature control of ±0.1℃. SUMMARY

[0003] To solve at least one of the above technical problems, the present application provides a temperature control method of a liquid cooling system, which can quickly take away the heat generated by the laser working and improve the temperature control precision.

[0004] In a first aspect, the temperature control method of the liquid cooling system provided by the present application comprises

[0005] obtaining a set value of a water supply temperature;

[0006] running a main pump;

[0007] running a sub-pump;

[0008] running a compressor;

[0009] opening an expansion valve, obtaining suction temperature, low-pressure pressure, superheat and saturation temperature of the compressor, and adjusting the opening degree of the expansion valve according to the suction temperature, the low-pressure pressure, the superheat and the saturation temperature;

[0010] obtaining an actual value of the water supply temperature;

[0011] controlling a refrigeration solenoid valve, a cold-gas bypass solenoid valve and a hot-gas bypass solenoid valve of the compressor to be opened or closed according to the temperature difference between the set value of the water supply temperature and the actual value of the water supply temperature.

[0012] The first aspect of the present application has at least the following beneficial effects: the expansion valve can expand the freon compressed by the compressor from liquid to gas to absorb heat, obtain the suction temperature, low pressure, superheat and saturation temperature of the compressor, adjust the opening degree of the expansion valve according to the suction temperature, low pressure, superheat and saturation temperature, finely adjust the refrigerating capacity of the compressor when the compressor is refrigerating, and improve the temperature control precision; the refrigeration electromagnetic valve is used for refrigeration, the cold gas bypass electromagnetic valve is used for reducing the refrigerating capacity, and the hot gas bypass electromagnetic valve is used for increasing the temperature; the temperature difference between the set value and the actual value of the water supply temperature is calculated, the refrigeration electromagnetic valve, the cold gas bypass electromagnetic valve and the hot gas bypass electromagnetic valve of the compressor are controlled to be opened or closed, and the opening degree of the expansion valve is controlled in combination with the opening or closing of the refrigeration electromagnetic valve, the cold gas bypass electromagnetic valve and the hot gas bypass electromagnetic valve, so that the precision control of the refrigerating capacity of the compressor can be improved, and the requirement of high-precision temperature control can be met.

[0013] In some embodiments of the first aspect of the present application, the refrigeration electromagnetic valve, the cold gas bypass electromagnetic valve and the hot gas bypass electromagnetic valve of the compressor are controlled to be opened or closed according to the temperature difference between the set value and the actual value of the water supply temperature, comprising:

[0014] the refrigeration electromagnetic valve is opened after the compressor is running;

[0015] if the actual value of the water supply temperature is less than the set value of the water supply temperature by 0.05℃, the refrigeration electromagnetic valve, the cold gas bypass electromagnetic valve and the hot gas bypass electromagnetic valve are closed; or

[0016] if the actual value of the water supply temperature is greater than the set value of the water supply temperature by 0.05℃ and the return air temperature is less than 18.8℃, the hot gas bypass electromagnetic valve is opened, and the cold gas bypass electromagnetic valve and the refrigeration electromagnetic valve are closed; or

[0017] if the actual value of the water supply temperature is greater than the set value of the water supply temperature by 0.05℃ and the return air temperature is greater than 20.2℃, the cold gas bypass electromagnetic valve is opened, and the hot gas bypass electromagnetic valve and the refrigeration electromagnetic valve are closed.

[0018] In some embodiments of the first aspect of the present application, if the actual value of the water supply temperature is greater than the set value of the water supply temperature by 0.05℃ and the return air temperature is less than 18.8℃, the hot gas bypass electromagnetic valve is opened, and the cold gas bypass electromagnetic valve and the refrigeration electromagnetic valve are closed, further comprising:

[0019] the hot gas bypass electromagnetic valve is opened for 2s and then closed, and the refrigeration electromagnetic valve is opened after the hot gas bypass electromagnetic valve is closed to refrigerate.

[0020] In some embodiments of the first aspect of the present application, the compressor is running, further comprising:

[0021] the compressor is running at a set frequency;

[0022] The current water supply temperature is retrieved every 5 seconds;

[0023] The compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago.

[0024] In some embodiments of the first aspect of this application, the compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago, including:

[0025] The difference between the current temperature and the water supply temperature 5 seconds ago is within 0.06℃, and the compressor frequency remains unchanged;

[0026] The current temperature is 0.06℃ higher than the water supply temperature 5 seconds ago, and the compressor's operating frequency increases by 1 Hz;

[0027] The current temperature is 0.12℃ higher than the water supply temperature 5 seconds ago, and the compressor's operating frequency increases by 2 Hz;

[0028] The current temperature is 0.15℃ higher than the water supply temperature 5 seconds ago, and the compressor's operating frequency increases by 3 Hz;

[0029] The current temperature is 0.06℃ lower than the water supply temperature 5 seconds ago, and the compressor's operating frequency drops by 1 Hz;

[0030] The current temperature is 0.12℃ lower than the water supply temperature 5 seconds ago, and the compressor's operating frequency has decreased by 2 Hz;

[0031] The current temperature is 0.15℃ lower than the water supply temperature 5 seconds ago, and the compressor's operating frequency has decreased by 3 Hz.

[0032] In some embodiments of the first aspect of this application, the compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago, including:

[0033] The operating frequency of the compressor is controlled between 30Hz and 60Hz.

[0034] In some embodiments of the first aspect of this application, the operation of the compressor further includes:

[0035] Obtain the high pressure of the compressor;

[0036] The compressor's cooling fan adjusts its speed according to the high pressure.

[0037] In some embodiments of the first aspect of this application, after the main pump is running, the following further includes:

[0038] Start or stop the heater to maintain a constant temperature in the liquid cooling system.

[0039] In some embodiments of the first aspect of this application, the starting or stopping of the heater includes:

[0040] Obtain the actual values ​​of the supply water temperature and the return water temperature;

[0041] The heater will start if the actual supply water temperature is 0.4℃ lower than the heater start-up temperature, or if the temperature difference between the actual supply water temperature and the actual return water temperature is less than 0.4℃; or

[0042] If the actual supply water temperature is 0.4℃ higher than the heater shut-off temperature and the temperature difference between the actual supply water temperature and the actual return water temperature is greater than 0.4℃, the heater will be shut off.

[0043] In some embodiments of the first aspect of this application, before the compressor operates, the temperature control method of the liquid cooling system further includes:

[0044] The flow rate from the auxiliary pump is detected, and once the flow rate is detected, the compressor operates to exchange heat with the auxiliary pump. Attached Figure Description

[0045] The aspects and advantages described and / or added to the embodiments of this application will become apparent and readily understood in conjunction with the following drawings. It should be noted that the embodiments illustrated in the following drawings are exemplary and are used only to explain this application, and should not be construed as limiting this application.

[0046] Figure 1 A flowchart illustrating the temperature control method for a liquid cooling system provided in this application embodiment. Detailed Implementation

[0047] The following is combined Figure 1 The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0048] In the description of this application, it should be understood that the use of terms such as "center," "middle," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0050] Please see Figure 1 The first aspect of this application proposes a temperature control method for a liquid cooling system, comprising the following steps:

[0051] S100. Obtain the set value of the water supply temperature; set the set value of the water supply temperature according to the cooling requirements of the laser, obtain the set value of the water supply temperature after setting, and control the cooling capacity according to the set value of the water supply temperature.

[0052] S200. Main pump operation; The function of the main pump is to circulate cooling water to remove the heat emitted by the laser. Before the system is started, it is necessary to check the opening and closing status of the main pump circuit valves. After the system is started, the main pump contactor closes and the system operates at power frequency.

[0053] S300. Auxiliary pump operation; the function of the auxiliary pump is to circulate cooling water and exchange heat with the compressor. After the system starts operating, the auxiliary pump contactor closes, and the system operates at mains frequency.

[0054] S400. Compressor in operation; The compressor's function is to compress Freon for refrigeration. After the system is running, the compressor needs to wait for the auxiliary pump to start before it can start. The compressor's operation is controlled by the frequency converter.

[0055] S500. The expansion valve opens to obtain the compressor's suction temperature, low-pressure, superheat, and saturation temperature. The valve's opening is adjusted based on these parameters. The expansion valve's function is to expand the refrigerant compressed by the compressor from a liquid state to a gaseous state, absorbing heat. The expansion valve operates along with the compressor and is controlled by an electronic expansion valve controller. This controller calculates the saturation temperature and superheat based on the compressor inlet suction temperature and low-pressure, and automatically adjusts the expansion valve opening based on these parameters.

[0056] S600. Obtain the actual value of the water supply temperature; obtain the actual value of the water supply temperature, and adjust the cooling capacity according to the actual value of the water supply temperature so that the water supply temperature can approach the set value.

[0057] S700. The compressor's refrigeration solenoid valve, cold air bypass solenoid valve, and hot air bypass solenoid valve are opened or closed based on the temperature difference between the set value and the actual value of the water supply temperature.

[0058] An expansion valve allows the refrigerant compressed by the compressor to expand from a liquid state to a gaseous state, absorbing heat. This allows for the acquisition of the compressor's suction temperature, low-pressure, superheat, and saturation temperature. Adjusting the opening of the expansion valve based on these parameters enables fine-tuning of the compressor's cooling capacity during refrigeration, improving temperature control accuracy. A refrigeration solenoid valve is used for cooling, a cold air bypass solenoid valve reduces the cooling capacity, and a hot air bypass solenoid valve increases the temperature. By calculating the temperature difference between the setpoint and the actual supply water temperature, the opening and closing of the compressor's refrigeration, cold air bypass, and hot air bypass solenoid valves are controlled. Combining the expansion valve opening control with the opening and closing of these valves improves the precision of compressor cooling capacity control, meeting the requirements for high-precision temperature control.

[0059] In some embodiments, step S700, controlling the opening or closing of the compressor's refrigeration solenoid valve, cold air bypass solenoid valve, and hot air bypass solenoid valve based on the temperature difference between the set value and the actual value of the water supply temperature, includes:

[0060] After the compressor starts running, the refrigeration solenoid valve opens. Specifically, when the actual supply water temperature is less than the set supply water temperature by 0.05℃, the difference is small, and no cooling or temperature increase is needed. In this case, the refrigeration solenoid valve, the cold air bypass solenoid valve, and the hot air bypass solenoid valve are closed. When the actual supply water temperature is greater than the set supply water temperature by 0.05℃ and the return air temperature is less than 18.8℃, the return air temperature is low. The hot air bypass solenoid valve opens, while the cold air bypass solenoid valve and the refrigeration solenoid valve close. The hot air bypass solenoid valve bypasses a portion of the hot air back to the main circuit, thus increasing the temperature. When the actual supply water temperature is greater than the set supply water temperature by 0.05℃ and the return air temperature is greater than 20.2℃, the return air temperature is high. The cold air bypass solenoid valve opens, while the hot air bypass solenoid valve and the refrigeration solenoid valve close. The cold air bypass solenoid valve bypasses a portion of the cold air to the main circuit, causing the return air temperature to decrease. It is understandable that when the hot gas bypass solenoid valve is open, it will close when the return gas temperature is greater than 20.2℃; when the cold gas bypass solenoid valve is open, it will close when the return gas temperature is less than 18.8℃. The cooling solenoid valve, hot gas bypass solenoid valve, and cold gas bypass solenoid valve will not open simultaneously.

[0061] In some embodiments, when the actual supply water temperature is 0.05°C higher than the set supply water temperature and the return gas temperature is less than 18.8°C (low return gas temperature), the hot gas bypass solenoid valve is opened. After 2 seconds, the hot gas bypass solenoid valve closes, and then the cooling solenoid valve opens for cooling. By limiting the opening time of the hot gas bypass solenoid valve, a rapid temperature rise caused by an excessively long opening time can be avoided, thus preventing a decrease in temperature control accuracy. Limiting the opening time of the hot gas bypass solenoid valve to 2 seconds, and immediately closing it after 2 seconds while opening the cooling solenoid valve for cooling, ensures that the temperature fluctuation is small and meets the requirements for temperature control accuracy.

[0062] In some embodiments, step S400, during compressor operation, further includes:

[0063] The compressor operates at a set frequency;

[0064] The current water supply temperature is retrieved every 5 seconds;

[0065] The compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago.

[0066] The compressor is controlled by a frequency converter. It acquires the current water supply temperature every 5 seconds and compares the current water supply temperature with the water supply temperature 5 seconds ago. By comparing the current temperature, the frequency of the compressor is adjusted, which can achieve coarse adjustment of the water supply temperature, so that the water supply temperature gradually approaches the set value while remaining stable.

[0067] Specifically, in some embodiments, the compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago, including:

[0068] If the difference between the current temperature and the water supply temperature 5 seconds ago is within 0.06℃, the compressor frequency remains unchanged. When the difference between the current water supply temperature and the water supply temperature 5 seconds ago is within 0.06℃, the change in water supply temperature within 5 seconds is within a controllable accuracy range, the compressor frequency remains unchanged, and the compressor continues to operate at the current frequency.

[0069] If the current temperature is 0.06℃ higher than the water supply temperature 5 seconds ago, the compressor's operating frequency increases by 1Hz. When the current water supply temperature is 0.06℃ higher than the water supply temperature 5 seconds ago, the water supply temperature has increased compared to the temperature 5 seconds ago. At this time, the frequency converter controls the compressor to increase its operating frequency. Specifically, the compressor's operating frequency increases by 1Hz to increase the cooling capacity and cool the water supply.

[0070] If the current temperature is 0.12℃ higher than the water supply temperature 5 seconds ago, the compressor's operating frequency will increase by 2 Hz. When the current water supply temperature is 0.12℃ higher than the water supply temperature 5 seconds ago, the increase in water supply temperature compared to 5 seconds ago is moderate. At this time, the frequency converter controls the compressor to increase its operating frequency. Specifically, the compressor's operating frequency will increase by 2 Hz to increase the cooling capacity and cool the water supply.

[0071] If the current temperature is 0.15℃ higher than the water supply temperature 5 seconds ago, the compressor's operating frequency increases by 3Hz. When the current water supply temperature is 0.15℃ higher than the water supply temperature 5 seconds ago, the water supply temperature has increased significantly compared to 5 seconds ago. At this time, the frequency converter controls the compressor to increase its operating frequency. Specifically, the compressor's operating frequency increases by 3Hz to increase the cooling capacity and cool the water supply.

[0072] If the current temperature is 0.06℃ lower than the water supply temperature 5 seconds ago, the compressor's operating frequency will decrease by 1 Hz. When the current water supply temperature is 0.06℃ lower than the water supply temperature 5 seconds ago, the water supply temperature has decreased compared to the temperature 5 seconds ago. At this time, the frequency converter controls the compressor to reduce its operating frequency. Specifically, the compressor's operating frequency decreases by 1 Hz to reduce the cooling capacity and raise the water supply temperature.

[0073] If the current temperature is 0.12℃ lower than the water supply temperature 5 seconds ago, the compressor's operating frequency will decrease by 2 Hz. When the current water supply temperature is 0.12℃ lower than the water supply temperature 5 seconds ago, the decrease in water supply temperature compared to 5 seconds ago is moderate. At this time, the frequency converter controls the compressor to reduce its operating frequency. Specifically, the compressor's operating frequency decreases by 2 Hz to reduce the cooling capacity and raise the water supply temperature.

[0074] If the current temperature is 0.15℃ lower than the water supply temperature 5 seconds ago, the compressor's operating frequency will decrease by 3Hz. When the current water supply temperature is 0.15℃ lower than the water supply temperature 5 seconds ago, the water supply temperature has dropped significantly compared to 5 seconds ago. At this time, the frequency converter controls the compressor to reduce its operating frequency. Specifically, the compressor's operating frequency decreases by 3Hz to reduce the cooling capacity and raise the water supply temperature.

[0075] In some embodiments, the compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago, including:

[0076] The compressor's operating frequency is controlled between 30Hz and 60Hz. Adjusting the compressor's frequency allows for coarse temperature adjustment of the water supply, gradually approaching the set value while maintaining stability. However, to ensure the compressor's overall cooling capacity is neither too high nor too low, controlling the operating frequency between 30Hz and 60Hz prevents drastic increases or decreases in cooling capacity. This allows for real-time adjustment of cooling capacity while controlling the magnitude of temperature changes, meeting the requirements for temperature control accuracy. It is understood that in some embodiments, when adjusting the compressor frequency based on temperature changes, if the current water supply temperature continues to decrease compared to 5 seconds ago when the compressor's operating frequency drops to 30Hz, the compressor's operating frequency will remain at 30Hz. In this case, other components such as the expansion valve, refrigeration solenoid valve, hot gas bypass solenoid valve, and cold gas bypass solenoid valve will continue to regulate the temperature. When the compressor's operating frequency rises to 60 Hz, if the current water supply temperature continues to rise compared to 5 seconds ago, the compressor's operating frequency will remain at 60 Hz. At this time, the temperature is regulated by other components such as the expansion valve, refrigeration solenoid valve, hot gas bypass solenoid valve, and cold gas bypass solenoid valve.

[0077] In some embodiments, step S400, compressor operation, further includes:

[0078] Obtain the high pressure of the compressor;

[0079] The compressor's cooling fan adjusts its speed according to the high pressure.

[0080] The function of the cooling fan is to remove heat generated at the high-pressure end of the compressor. The speed of the cooling fan is adjusted according to the high pressure at the compressor's high-pressure end. Specifically, in some embodiments, when the compressor's high-pressure is less than or equal to 20 bar, the cooling fan operates at 50% speed; when the compressor's high-pressure is 21 bar, the cooling fan operates at 60% speed; when the compressor's high-pressure is 22 bar, the cooling fan operates at 70% speed; when the compressor's high-pressure is 23 bar, the cooling fan operates at 80% speed; when the compressor's high-pressure is 24 bar, the cooling fan operates at 90% speed; and when the compressor's high-pressure is greater than or equal to 25 bar, the fan operates at 100% speed. By adjusting the cooling fan speed in real time, the compressor can be cooled according to its heat dissipation needs, saving power while ensuring the compressor's normal operation.

[0081] In some embodiments, after the main pump operates in step S200, the method further includes:

[0082] Start or stop the heater to maintain a constant temperature in the liquid cooling system. The heater heats the internal circulating water of the auxiliary pump. Starting the heater neutralizes the cooling capacity, thus maintaining a constant temperature throughout the liquid cooling system.

[0083] Specifically, in some embodiments, turning the heater on or off includes:

[0084] Obtain the actual values ​​of the supply water temperature and the return water temperature;

[0085] The heater will start if the actual supply water temperature is 0.4℃ lower than the heater start-up temperature, or if the temperature difference between the actual supply water temperature and the actual return water temperature is less than 0.4℃; or

[0086] If the actual supply water temperature is 0.4℃ higher than the heater shut-off temperature and the temperature difference between the actual supply water temperature and the actual return water temperature is greater than 0.4℃, the heater will be shut off.

[0087] The supply water temperature is the temperature of the cooling water supplied to the laser by the main pump, and the return water temperature is the temperature of the cooling water returning from the laser. The actual values ​​of the supply and return water temperatures are obtained. When the temperature difference between the actual supply and return water temperatures is less than 0.4℃, it is determined that the laser is not in operation. Since the compressor remains operational, it heats the internal circulating water through the heater to remove the cooling energy generated by the compressor, thus maintaining a constant temperature throughout the liquid cooling system. It is understood that the heater has preset start-up and stop-down temperatures. When the actual supply water temperature is 0.4℃ lower than the heater start-up temperature, it is determined that the laser is not in operation, and the heater needs to be activated to remove the heat generated by the compressor.

[0088] When the actual value of the supply water temperature is 0.4℃ higher than the heater shut-off temperature and the temperature difference between the actual value of the supply water temperature and the actual value of the return water temperature is greater than 0.4℃, it is determined that the laser is in working condition. After the laser exchanges heat with the supply water temperature, the supply water temperature rises. It is not necessary for the heater to maintain the temperature of the entire liquid cooling system. Therefore, the heater is turned off.

[0089] In some embodiments, before the compressor operates in step S400, the temperature control method for the liquid cooling system further includes:

[0090] The flow rate from the auxiliary pump is detected. Once the flow rate is detected, the compressor runs and exchanges heat with the auxiliary pump.

[0091] The function of the auxiliary pump is to enable the cooling water circulation and heat exchange between the compressor and the cooling water. After the auxiliary pump starts running, the cooling water circulation is initiated. At this time, a flow switch is needed to detect the flow rate of the auxiliary pump. The compressor can only run after the flow rate is detected; otherwise, it is to prevent the compressor from cooling prematurely and causing condensation.

[0092] In the description of this specification, the use of terms such as "an embodiment," "some examples," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

[0094] In the description of this application, the presence of a comma ("、") in the patent title indicates an "and" relationship, not an "or" relationship. For example, if the patent title is "A and B", it means that the content claimed in this application is: a technical solution with the subject matter title A and a technical solution with the subject matter title B.

Claims

1. A temperature control method for a liquid cooling system, characterized in that, Includes the following steps: Obtain the set value of the water supply temperature; Main pump is running; Auxiliary pump operation; The compressor operates at a set frequency; the current water supply temperature is acquired every 5 seconds; the compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago. The expansion valve opens to obtain the compressor's suction temperature, low pressure, superheat, and saturation temperature, and adjusts the opening degree of the expansion valve according to the suction temperature, low pressure, superheat, and saturation temperature. Obtain the actual value of the water supply temperature; The compressor's refrigeration solenoid valve, cold air bypass solenoid valve, and hot air bypass solenoid valve are controlled to open or close based on the temperature difference between the set value and the actual value of the water supply temperature; the refrigeration solenoid valve opens after the compressor starts running. If the actual water supply temperature is less than the set water supply temperature by 0.05℃, the cooling solenoid valve, the cold air bypass solenoid valve, and the hot air bypass solenoid valve are closed; or if the actual water supply temperature is greater than the set water supply temperature by 0.05℃ and the return air temperature is less than 18.8℃, the hot air bypass solenoid valve is open, and the cold air bypass solenoid valve and the cooling solenoid valve are closed; or if the actual water supply temperature is greater than the set water supply temperature by 0.05℃ and the return air temperature is greater than 20.2℃, the cold air bypass solenoid valve is open, and the hot air bypass solenoid valve and the cooling solenoid valve are closed.

2. The temperature control method for the liquid cooling system according to claim 1, characterized in that, The actual water supply temperature is 0.05℃ greater than the set water supply temperature and the return air temperature is less than 18.8℃. The hot air bypass solenoid valve is open, and the cold air bypass solenoid valve and the cooling solenoid valve are closed. The system also includes: The hot gas bypass solenoid valve opens for 2 seconds and then closes. After the hot gas bypass solenoid valve closes, the cooling solenoid valve opens to perform cooling.

3. The temperature control method for the liquid cooling system according to claim 1, characterized in that, The compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago, including: The difference between the current temperature and the water supply temperature 5 seconds ago is within 0.06℃, and the compressor frequency remains unchanged; The current temperature is 0.06℃ higher than the water supply temperature 5 seconds ago, and the compressor's operating frequency increases by 1 Hz; The current temperature is 0.12℃ higher than the water supply temperature 5 seconds ago, and the compressor's operating frequency increases by 2 Hz; The current temperature is 0.15℃ higher than the water supply temperature 5 seconds ago, and the compressor's operating frequency increases by 3 Hz; The current temperature is 0.06℃ lower than the water supply temperature 5 seconds ago, and the compressor's operating frequency drops by 1 Hz; The current temperature is 0.12℃ lower than the water supply temperature 5 seconds ago, and the compressor's operating frequency has decreased by 2 Hz; The current temperature is 0.15℃ lower than the water supply temperature 5 seconds ago, and the compressor's operating frequency has decreased by 3 Hz.

4. The temperature control method for the liquid cooling system according to claim 1 or 3, characterized in that, The compressor controls the frequency based on the difference between the current temperature and the water supply temperature 5 seconds ago, including: The operating frequency of the compressor is controlled between 30Hz and 60Hz.

5. The temperature control method for the liquid cooling system according to claim 1, characterized in that, The operation of the compressor also includes: Obtain the high pressure of the compressor; The compressor's cooling fan adjusts its speed according to the high pressure.

6. The temperature control method for the liquid cooling system according to claim 1, characterized in that, After the main pump is running, the following is also included: Start or stop the heater to maintain a constant temperature in the liquid cooling system.

7. The temperature control method for the liquid cooling system according to claim 6, characterized in that, The process of starting or stopping the heater includes: Obtain the actual values ​​of the supply water temperature and the return water temperature; The heater will start if the actual supply water temperature is 0.4℃ lower than the heater start-up temperature, or if the temperature difference between the actual supply water temperature and the actual return water temperature is less than 0.4℃; or If the actual supply water temperature is 0.4℃ higher than the heater shut-off temperature and the temperature difference between the actual supply water temperature and the actual return water temperature is greater than 0.4℃, the heater will be shut off.

8. The temperature control method for the liquid cooling system according to claim 1, characterized in that, Before the compressor operates, the temperature control method for the liquid cooling system further includes: The flow rate from the auxiliary pump is detected, and once the flow rate is detected, the compressor operates to exchange heat with the auxiliary pump.

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