Temperature control method of liquid cooling system

Abstract

The invention discloses a temperature control method of a liquid cooling system. The temperature control method of the liquid cooling system comprises the steps of obtaining a set value of a water supply temperature; a main pump operates; the auxiliary pump operates; a compressor operates; the expansion valve is opened, the suction temperature, the low pressure, the superheat degree and the saturation temperature of the compressor are obtained, and the opening degree of the expansion valve is adjusted according to the suction temperature, the low pressure, the superheat degree and the saturation temperature; acquiring an actual value of the water supply temperature; controlling a refrigeration electromagnetic valve, a cold air bypass electromagnetic valve and a hot air bypass electromagnetic 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. By adjusting the opening degree of the expansion valve, the refrigerating capacity of the compressor can be finely adjusted during refrigeration of the compressor, and the temperature control precision is improved; through the combination of opening control of the expansion valve and opening or closing of the refrigeration electromagnetic valve, the cold air bypass electromagnetic valve and the hot air bypass electromagnetic valve, precision control over the refrigerating capacity of the compressor can be improved, and the requirement for high-precision temperature control is met.

Description

Technical Field

[0001] The present application relates to the technical field of temperature control of liquid cooling systems, and in particular to a temperature control method of liquid cooling systems. Background Art

[0002] In related technologies, the demand for high-performance laser equipment in the fields of material processing, medical treatment, scientific research, etc. continues to grow. When the laser is working, it generates heat, which increases the temperature of the laser. According to the working characteristics of the laser, the wavelength will drift with the temperature change, causing the laser emission power to change, thereby causing the instability of the entire emission system, and even making the emission system unable to work. Therefore, the temperature of the laser must be controlled with high precision to ensure its stable and normal operation. The current liquid cooling equipment controls the temperature of the laser by controlling the temperature of the cold storage water tank. The control accuracy is generally ±3.0℃, which cannot meet the requirements of high-precision temperature control of ±0.1℃. Summary of the invention

[0003] In order to solve at least one of the above technical problems, the present application provides a temperature control method for a liquid cooling system, which can quickly remove the heat generated by the laser and improve the temperature control accuracy.

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

[0005] Get the set value of water supply temperature;

[0006] The main pump is running;

[0007] The auxiliary pump is running;

[0008] The compressor is running;

[0009] The expansion valve is opened, the suction temperature, low pressure, superheat and saturation temperature of the compressor are obtained, and the opening of the expansion valve is adjusted according to the suction temperature, the low pressure, the superheat and the saturation temperature;

[0010] Get the actual value of the water supply temperature;

[0011] The refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve of the compressor are controlled to open or close 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 embodiment of the present application has at least the following beneficial effects: the expansion valve can make the Freon compressed by the compressor expand from liquid to gas to absorb heat, obtain the suction temperature, low pressure, superheat and saturation temperature of the compressor, and adjust the opening of the expansion valve according to the suction temperature, low pressure, superheat and saturation temperature, so that the refrigeration capacity of the compressor can be fine-tuned when the compressor is refrigerating, thereby improving the temperature control accuracy; the refrigeration solenoid valve is used for refrigeration, the cold air bypass solenoid valve is used to reduce the refrigeration capacity, and the hot air bypass solenoid valve is used to increase the temperature. By calculating the temperature difference between the set value of the water supply temperature and the actual value of the water supply temperature, the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve of the compressor are controlled to open or close. By controlling the opening of the expansion valve in combination with the opening or closing of the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve, the precision control of the refrigeration capacity of the compressor can be improved to meet the requirements of high-precision temperature control.

[0013] In certain embodiments of the first aspect of the present application, the controlling the opening or closing of the refrigeration solenoid valve, the cold air bypass solenoid valve, and the hot air bypass solenoid 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 includes:

[0014] After the compressor is running, the refrigeration solenoid valve is opened;

[0015] The actual value of the water supply temperature is less than the set value of the water supply temperature by 0.05°C, and the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve are closed; or

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

[0017] The actual value of the water supply temperature is greater than the set value of the water supply temperature by 0.05°C and the return air temperature is greater than 20.2°C, the cold air bypass solenoid valve is opened, and the hot air bypass solenoid valve and the refrigeration solenoid valve are closed.

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

[0019] The hot gas bypass solenoid valve is closed after being opened for 2 seconds, and the refrigeration solenoid valve is opened for refrigeration after the hot gas bypass solenoid valve is closed.

[0020] In certain embodiments of the first aspect of the present application, the operation of the compressor further comprises:

[0021] The compressor operates at a set frequency;

[0022] Get the current temperature of the water supply every 5 seconds;

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

[0024] In certain embodiments of the first aspect of the present application, the compressor controls the frequency according to 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°C, and the frequency of the compressor remains unchanged;

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

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

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

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

[0030] The current temperature is 0.12℃ lower than the water supply temperature 5s ago, and the operating frequency of the compressor drops by 2hz;

[0031] The current temperature is 0.15℃ lower than the water supply temperature 5s ago, and the operating frequency of the compressor drops by 3hz.

[0032] In certain embodiments of the first aspect of the present application, the compressor controls the frequency according to 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 30 Hz and 60 Hz.

[0034] In certain embodiments of the first aspect of the present application, the operation of the compressor further comprises:

[0035] obtaining the high pressure of the compressor;

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

[0037] In certain embodiments of the first aspect of the present application, after the main pump is running, the method further comprises:

[0038] Start or stop the heater to keep the temperature of the liquid cooling system constant.

[0039] In certain embodiments of the first aspect of the present application, starting or shutting down the heater comprises:

[0040] Get the actual value of the supply water temperature and the actual value of the return water temperature;

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

[0042] If the actual value of the supply water temperature is 0.4°C 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 higher than 0.4°C, the heater will be shut down.

[0043] In certain embodiments of the first aspect of the present application, before the compressor is operated, the temperature control method of the liquid cooling system further includes:

[0044] The flow rate from the auxiliary pump is detected, and after the flow rate is detected, the compressor is operated to exchange heat with the auxiliary pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The aspects and advantages described and / or attached in the embodiments of the present application will become apparent and easy to understand in conjunction with the following drawings. It should be noted that the embodiments embodied in the following drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0046] Figure 1 This is a flow chart of a temperature control method for a liquid cooling system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0047] Combine the following Figure 1 Embodiments of the present application are described in detail, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0048] In the description of the present application, it should be understood that if the terms "center", "middle", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] See also Figure 1 In a first aspect, the present application proposes a temperature control method for a liquid cooling system, comprising the following steps:

[0051] S100. Obtain a set value of the water supply temperature; set the set value of the water supply temperature according to the cooling demand 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 operation is to circulate the cooling water to take away the heat generated by the laser. Before the system is operated, it is necessary to check whether the main pump circuit valve is open or closed. After the system is operated, the main pump contactor is closed and the system operates at the industrial frequency.

[0053] S300. Auxiliary pump operation: The auxiliary pump operation is to make the cooling water circulate and the compressor exchange heat. After the system is running, the auxiliary pump contactor is closed and the power frequency is operated.

[0054] S400. Compressor operation; the function of the compressor is to compress Freon for refrigeration. After the system is running, the compressor needs to wait for the auxiliary pump to start running. The operation of the compressor is controlled by the inverter.

[0055] S500. The expansion valve is opened, and the suction temperature, low pressure, superheat and saturation temperature of the compressor are obtained. The opening of the expansion valve is adjusted according to the suction temperature, low pressure, superheat and saturation temperature. The function of the expansion valve is to expand the Freon compressed by the compressor from liquid to gas to absorb heat. The expansion valve runs together with the compressor. The expansion valve is controlled by an electronic expansion valve controller. The electronic expansion valve controller calculates the saturation temperature and superheat according to the suction temperature and low pressure at the inlet of the compressor, and automatically adjusts the opening of the expansion valve according to the suction temperature, low pressure, superheat and saturation temperature.

[0056] S600. Obtaining an actual value of the water supply temperature; obtaining the actual value of the water supply temperature, and adjusting the cooling capacity according to the actual value of the water supply temperature, so that the water supply temperature can be close to the set value.

[0057] S700. Control the refrigeration solenoid valve, cold air bypass solenoid valve and hot air bypass solenoid valve of the compressor to open or close according to the temperature difference between the set value of the water supply temperature and the actual value of the water supply temperature.

[0058] The expansion valve can be used to expand the Freon compressed by the compressor from liquid to gas to absorb heat, and the suction temperature, low pressure, superheat and saturation temperature of the compressor can be obtained. The opening of the expansion valve is adjusted according to the suction temperature, low pressure, superheat and saturation temperature, and the refrigeration capacity of the compressor can be fine-tuned when the compressor is refrigerating, thereby improving the temperature control accuracy; the refrigeration solenoid valve is used for refrigeration, the cold air bypass solenoid valve is used to reduce the refrigeration capacity, and the hot air bypass solenoid valve is used to increase the temperature. By calculating the temperature difference between the set value of the water supply temperature and the actual value of the water supply temperature, the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve of the compressor are controlled to open or close. By controlling the opening of the expansion valve in combination with the opening or closing of the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve, the precision control of the compressor refrigeration capacity can be improved to meet the requirements of high-precision temperature control.

[0059] In some embodiments, step S700 controls the opening or closing of the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid 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, including:

[0060] After the compressor is running, the refrigeration solenoid valve is opened. The refrigeration solenoid valve is used for refrigeration. Specifically, when the actual value of the water supply temperature is less than the set value of the water supply temperature by 0.05℃, the actual value of the water supply temperature is small compared with the set value of the water supply temperature, and there is no need to refrigerate or increase the temperature. At this time, the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve are closed. When 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 return air temperature is low, the hot air bypass solenoid valve is opened, the cold air bypass solenoid valve and the refrigeration solenoid valve are closed, and the hot air bypass solenoid valve bypasses part of the hot air to return the hot air to the main circuit to achieve temperature increase. When 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 return air temperature is high, the cold air bypass solenoid valve is opened, the hot air bypass solenoid valve and the refrigeration solenoid valve are closed, and the cold air bypass solenoid valve bypasses part of the cold air to the main circuit to reduce the return air temperature. It can be understood that when the hot gas bypass solenoid valve is opened, the hot gas bypass solenoid valve is controlled to close when the return air temperature is greater than 20.2℃; when the cold air bypass solenoid valve is opened, the cold air bypass solenoid valve is controlled to close when the return air temperature is less than 18.8℃. The refrigeration solenoid valve, the hot gas bypass solenoid valve and the cold air bypass solenoid valve will not be opened at the same time.

[0061] In some embodiments, when the actual value of the water supply temperature is greater than the set value of the water supply temperature by 0.05°C and the return air temperature is less than 18.8°C, the return air temperature is low, and the hot gas bypass solenoid valve is opened. The hot gas bypass solenoid valve is closed after opening for 2s. After the hot gas bypass solenoid valve is closed, the refrigeration solenoid valve is opened for refrigeration. By limiting the opening time of the hot gas bypass solenoid valve, it is possible to avoid a sharp rise in temperature caused by the hot gas bypass solenoid valve being opened for too long, thereby affecting the temperature control accuracy. The opening time of the hot gas bypass solenoid valve is limited to 2s, and the hot gas bypass solenoid valve is immediately closed after opening for 2s, and the refrigeration solenoid valve is opened for refrigeration. By controlling the duration, it is possible to ensure that the temperature change amplitude is small and the temperature control accuracy requirement is met.

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

[0063] The compressor runs at the set frequency;

[0064] Get the current temperature of the water supply every 5 seconds;

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

[0066] The compressor is controlled by a frequency converter. The current water supply temperature is obtained every 5 seconds, and the current water supply temperature is compared with the water supply temperature 5 seconds ago. The frequency of the compressor is adjusted by comparison, which can achieve coarse adjustment of the water supply temperature, so that the water supply temperature can gradually approach the set value while remaining stable.

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

[0068] When the difference between the current temperature and the water supply temperature 5 seconds ago is within 0.06°C, the frequency of the compressor remains unchanged; when the difference between the current temperature of the obtained water supply temperature and the water supply temperature 5 seconds ago is within 0.06°C, the change of the water supply temperature within 5 seconds is within the controllable accuracy range, the frequency of the compressor remains unchanged, and the compressor maintains the current frequency operation.

[0069] The current temperature is 0.06℃ higher than the water supply temperature 5s ago, and the operating frequency of the compressor is increased by 1hz; when the current temperature of the acquired water supply temperature is 0.06℃ higher than the water supply temperature 5s ago, the water supply temperature is higher than the temperature 5s ago. At this time, the inverter controls the compressor to increase the operating frequency. Specifically, the operating frequency of the compressor is increased by 1hz to increase the cooling capacity to cool the water supply temperature.

[0070] The current temperature is 0.12℃ higher than the water supply temperature 5s ago, and the operating frequency of the compressor is increased by 2Hz; when the current temperature of the acquired water supply temperature is 0.12℃ higher than the water supply temperature 5s ago, the water supply temperature has increased moderately compared with the temperature 5s ago. At this time, the inverter controls the compressor to increase the operating frequency. Specifically, the operating frequency of the compressor is increased by 2Hz to increase the cooling capacity to cool the water supply temperature.

[0071] The current temperature is 0.15℃ higher than the water supply temperature 5s ago, and the operating frequency of the compressor is increased by 3Hz; when the current temperature of the acquired water supply temperature is 0.15℃ higher than the water supply temperature 5s ago, the water supply temperature is significantly increased compared with the temperature 5s ago. At this time, the inverter controls the compressor to increase the operating frequency. Specifically, the operating frequency of the compressor is increased by 3Hz to increase the cooling capacity to cool the water supply temperature.

[0072] The current temperature is 0.06℃ lower than the water supply temperature 5s ago, and the operating frequency of the compressor decreases by 1hz; when the current temperature of the acquired water supply temperature is 0.06℃ lower than the water supply temperature 5s ago, the water supply temperature is lower than the temperature 5s ago. At this time, the inverter controls the compressor to reduce the operating frequency. Specifically, the operating frequency of the compressor decreases by 1hz to reduce the cooling capacity and increase the water supply temperature.

[0073] The current temperature is 0.12℃ lower than the water supply temperature 5s ago, and the operating frequency of the compressor decreases by 2hz; when the current temperature of the acquired water supply temperature is 0.12℃ lower than the water supply temperature 5s ago, the water supply temperature has a moderate drop compared to the temperature 5s ago. At this time, the inverter controls the compressor to reduce the operating frequency. Specifically, the operating frequency of the compressor decreases by 2hz to reduce the cooling capacity and increase the water supply temperature.

[0074] The current temperature is 0.15℃ lower than the water supply temperature 5s ago, and the operating frequency of the compressor drops by 3Hz. When the current temperature of the acquired water supply temperature is 0.15℃ lower than the water supply temperature 5s ago, the water supply temperature drops significantly compared to the temperature 5s ago. At this time, the inverter controls the compressor to reduce the operating frequency. Specifically, the operating frequency of the compressor drops by 3Hz to reduce the cooling capacity and increase the water supply temperature.

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

[0076] The operating frequency of the compressor is controlled between 30 Hz and 60 Hz. By adjusting the frequency of the compressor, the water supply temperature can be roughly adjusted, so that the water supply temperature gradually approaches the set value while remaining stable. However, in order to ensure that the overall cooling capacity of the compressor is not too large or too small, the operating frequency of the compressor is controlled between 30 Hz and 60 Hz, and the cooling capacity of the compressor will not rise or fall sharply. While adjusting the cooling capacity in real time, the change amplitude of the cooling capacity is controlled to meet the requirements of temperature control accuracy. It can be understood that in some embodiments, when the frequency of the compressor is adjusted according to temperature changes, when the operating frequency of the compressor drops to 30 Hz, if the current water supply temperature obtained continues to drop compared to 5 seconds ago, the operating frequency of the compressor will still remain at 30 Hz, and the expansion valve, refrigeration solenoid valve, hot gas bypass solenoid valve, cold gas bypass solenoid valve and other components will continue to regulate the temperature. When the operating frequency of the compressor rises to 60 Hz, if the current water supply temperature continues to rise compared to 5 seconds ago, the operating frequency of the compressor will remain at 60 Hz. At this time, the temperature will be 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] Obtaining 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 take away the heat generated by the high-pressure end of the compressor, and the speed of the cooling fan is adjusted according to the high-pressure pressure at the high-pressure end of the compressor. Specifically, in some embodiments, when the high-pressure pressure of the compressor is less than or equal to 20 bar, the cooling fan runs at a speed of 50%; when the high-pressure pressure of the compressor is 21 bar, the cooling fan runs at a speed of 60%; when the high-pressure pressure of the compressor is 22 bar, the cooling fan runs at a speed of 70%; when the high-pressure pressure of the compressor is 23 bar, the cooling fan runs at a speed of 80%; when the high-pressure pressure of the compressor is 24 bar, the cooling fan runs at a speed of 90%; when the high-pressure pressure of the compressor is greater than or equal to 25 bar, the fan runs at a speed of 100%. By adjusting the speed of the cooling fan in real time, the compressor can be cooled according to the cooling requirements of the compressor, saving power while ensuring the normal operation of the compressor.

[0081] In some embodiments, after the main pump is running in step S200, the following steps are further included:

[0082] Start or shut down the heater to keep the temperature of the liquid cooling system constant. The heater is used to heat the internal circulation water of the auxiliary pump. Starting the heater to neutralize the cooling capacity can keep the temperature of the entire liquid cooling system constant.

[0083] Specifically, in some embodiments, starting or shutting down the heater includes:

[0084] Get the actual value of the supply water temperature and the actual value of the return water temperature;

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

[0086] If the actual value of the supply water temperature is 0.4°C 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 higher than 0.4°C, the heater will be shut down.

[0087] The water supply temperature is the cooling water temperature supplied by the main pump to the laser, and the return water temperature is the cooling water temperature returned from the laser. The actual value of the water supply temperature and the actual value of the return water temperature are obtained. When the temperature difference between the actual value of the water supply temperature and the actual value of the return water temperature is lower than 0.4°C, the temperature difference between the water supply and the return water is small, and it is judged that the laser is not in working condition. Since the compressor will always remain in working condition, the inner circulating water is heated by the heater to take away the cold generated by the compressor so that the temperature of the entire liquid cooling system remains constant. It can be understood that the heater is set with a preset heater start temperature and heater shutdown temperature. When the actual value of the water supply temperature is 0.4°C lower than the heater start temperature, the actual value of the water supply temperature is high, and it is judged that the laser is not in working condition. At this time, the heater also needs to be turned on to take away the heat generated by the compressor.

[0088] When the actual value of the water supply temperature is 0.4°C higher than the heater shutdown temperature and the temperature difference between the actual value of the water supply temperature and the actual value of the return water temperature is higher than 0.4°C, the laser is judged to be in working state. After the laser exchanges heat with the water supply temperature, the water temperature rises. The heater is no longer needed to maintain the constant temperature of the entire liquid cooling system, and the heater is turned off.

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

[0090] The flow rate from the auxiliary pump is detected, and after the flow rate is detected, the compressor runs to exchange heat with the auxiliary pump.

[0091] The function of the auxiliary pump is to make the cooling water circulate and the compressor exchange heat. After the auxiliary pump is running, the cooling water circulation starts. At this time, a flow switch is needed to detect the flow of the auxiliary pump. The compressor can only run after the flow is detected. Otherwise, the compressor is prevented from cooling in advance and causing condensation.

[0092] In the description of this specification, if the reference terms "one embodiment", "some examples", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0093] The above describes the implementation methods of the present application in detail in conjunction with the accompanying drawings, but the present application is not limited to the above implementation methods. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present application.

[0094] In the description of this application, if "," appears in the patent name, it means an "and" relationship, not an "or" relationship. For example, if the patent name is "a kind of A, B", it means that the content required to be protected by this application is: the technical solution with the subject name A and the technical solution with the subject name B.

Claims

1. A temperature control method for a liquid cooling system, characterized in that: The following steps are involved: Get the set value of water supply temperature; The main pump is running; The auxiliary pump is running; The compressor is running; The expansion valve is opened, the suction temperature, low pressure, superheat and saturation temperature of the compressor are obtained, and the opening of the expansion valve is adjusted according to the suction temperature, the low pressure, the superheat and the saturation temperature; Get the actual value of the water supply temperature; The refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve of the compressor are controlled to open or close according to the temperature difference between the set value of the water supply temperature and the actual value of the water supply temperature.

2. The temperature control method of the liquid cooling system according to claim 1, characterized in that: The method of controlling the opening or closing of the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid 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 includes: After the compressor is running, the refrigeration solenoid valve is opened; The actual value of the water supply temperature is less than the set value of the water supply temperature by 0.05°C, and the refrigeration solenoid valve, the cold air bypass solenoid valve and the hot air bypass solenoid valve are closed; or The actual value of the water supply temperature is greater than the set value of the water supply temperature by 0.05°C and the return air temperature is less than 18.8°C, the hot gas bypass solenoid valve is opened, and the cold gas bypass solenoid valve and the refrigeration solenoid valve are closed; or The actual value of the water supply temperature is greater than the set value of the water supply temperature by 0.05°C and the return air temperature is greater than 20.2°C, the cold air bypass solenoid valve is opened, and the hot air bypass solenoid valve and the refrigeration solenoid valve are closed.

3. The temperature control method of the liquid cooling system according to claim 2, characterized in that: The actual value of the water supply temperature is greater than the set value of the water supply temperature by 0.05°C and the return air temperature is less than 18.8°C, the hot gas bypass solenoid valve is opened, and the cold gas bypass solenoid valve and the refrigeration solenoid valve are closed, further comprising: The hot gas bypass solenoid valve is closed after being opened for 2 seconds, and the refrigeration solenoid valve is opened for refrigeration after the hot gas bypass solenoid valve is closed.

4. The temperature control method of the liquid cooling system according to claim 1, characterized in that: The compressor operation further comprises: The compressor operates at a set frequency; Get the current temperature of the water supply every 5 seconds; The compressor controls the frequency according to the difference between the current temperature and the water supply temperature 5 seconds ago.

5. The temperature control method of the liquid cooling system according to claim 4, characterized in that: The compressor controls the frequency according to 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°C, and the frequency of the compressor remains unchanged; The current temperature is 0.06℃ higher than the water supply temperature 5s ago, and the operating frequency of the compressor increases by 1 Hz; The current temperature is 0.12℃ higher than the water supply temperature 5s ago, and the operating frequency of the compressor increases by 2hz; The current temperature is 0.15℃ higher than the water supply temperature 5s ago, and the operating frequency of the compressor increases by 3hz; The current temperature is 0.06℃ lower than the water supply temperature 5s ago, and the operating frequency of the compressor drops by 1hz; The current temperature is 0.12℃ lower than the water supply temperature 5s ago, and the operating frequency of the compressor drops by 2hz; The current temperature is 0.15℃ lower than the water supply temperature 5s ago, and the operating frequency of the compressor drops by 3hz.

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

7. The temperature control method of the liquid cooling system according to claim 1, characterized in that: The compressor operation further comprises: obtaining the high pressure of the compressor; The cooling fan of the compressor adjusts its rotation speed according to the high pressure.

8. The temperature control method of the liquid cooling system according to claim 1, characterized in that: After the main pump is running, the method further comprises: Start or stop the heater to keep the temperature of the liquid cooling system constant.

9. The temperature control method of the liquid cooling system according to claim 8, characterized in that: The starting or stopping of the heater comprises: Get the actual value of the supply water temperature and the actual value of the return water temperature; The actual value of the supply water temperature is 0.4℃ lower than the heater start temperature or the temperature difference between the actual value of the supply water temperature and the actual value of the return water temperature is less than 0.4℃, start the heater; or If the actual value of the supply water temperature is 0.4°C 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 higher than 0.4°C, the heater will be shut down.

10. The temperature control method of a liquid cooling system according to claim 1, characterized in that: Before the compressor is operated, the temperature control method of the liquid cooling system further includes: The flow rate from the auxiliary pump is detected, and after the flow rate is detected, the compressor is operated to perform heat exchange with the auxiliary pump.

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