Water chilling unit control method and device, water chilling unit, electronic equipment and medium

Abstract

The invention discloses a water chilling unit control method and device, a water chilling unit, electronic equipment and a medium. The method comprises the following steps: detecting a cooling water temperature parameter; the temperature interval where the cooling water temperature parameter is located is determined; if the cooling water temperature parameter is smaller than the corresponding first temperature threshold value, the cooling water flow and / or the cooling tower fan air volume are / is adjusted according to the cooling water temperature parameter, the unit operation load and the unit operation pressure difference, the cooling water temperature parameter is detected again, and circulation is conducted in sequence; and when the unit operation pressure difference is larger than or equal to the preset minimum pressure difference or the cooling water flow and the cooling tower fan air volume cannot be continuously reduced, the current cooling water flow and the current cooling tower fan air volume are kept unchanged. The water flow and / or the air volume of the cooling tower side are / is controlled according to the data of the unit side, the unit operation pressure difference can meet the requirement through intelligent linkage control of the unit side and the cooling tower side, and it is guaranteed that the water chilling unit can be normally started and operated under the low cooling water temperature working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of chillers, and in particular to a chiller control method, a chiller, an electronic device, and a medium. Background Art

[0002] Chillers are widely used in various cooling environments due to their high reliability and wide operating range. As their applications continue to expand, the requirements for chillers' water temperature operating range are also increasing. The need for long-term operation at low cooling water temperatures is becoming increasingly apparent.

[0003] Conventional chillers typically require a cooling water inlet temperature of no less than 18°C ​​during startup and operation. Oil return from the chiller primarily relies on differential pressure. If the cooling water inlet temperature is low (e.g., below 18°C), the chiller's condensing pressure will be low. The operating differential pressure of the chiller equals condensing pressure minus evaporating pressure, resulting in a low operating differential pressure. This leads to insufficient oil return pressure, preventing normal oil supply and ultimately preventing the chiller from operating normally.

[0004] With respect to the problem in the prior art that the chiller cannot operate normally when the cooling water temperature is low, no effective solution has been proposed so far. Summary of the Invention

[0005] Embodiments of the present invention provide a chiller control method, device, chiller, electronic equipment, and medium to at least solve the problem in the prior art that the chiller cannot operate normally when the cooling water temperature is low.

[0006] To solve the above technical problems, an embodiment of the present invention provides a chiller control method, comprising:

[0007] Detect cooling water temperature parameters;

[0008] Determining the temperature range of the cooling water temperature parameter;

[0009] If the cooling water temperature parameter is less than its corresponding first temperature threshold, the cooling water flow and / or cooling tower fan air volume are adjusted according to the cooling water temperature parameter, the unit operating load and the unit operating pressure difference, and the step of detecting the cooling water temperature parameter is returned to be executed. This cycle is repeated. When the unit operating pressure difference is greater than or equal to the preset minimum pressure difference or when the cooling water flow and cooling tower fan air volume cannot be further reduced, the current cooling water flow and cooling tower fan air volume are kept unchanged.

[0010] Optionally, adjusting the cooling water flow rate and / or the cooling tower fan air volume according to the cooling water temperature parameter, the unit operating load and the unit operating pressure difference includes:

[0011] If the cooling water temperature parameter is lower than the corresponding second temperature threshold, the cooling tower fan is turned off, and the cooling water flow rate is adjusted according to the unit operating load and the unit operating pressure difference;

[0012] If the cooling water temperature parameter is greater than or equal to the second temperature threshold and less than the first temperature threshold, the cooling tower fan is turned on, and the cooling tower fan air volume and cooling water flow are adjusted according to the unit operating load and the unit operating pressure difference.

[0013] Optionally, adjusting the cooling water flow rate according to the unit operating load and the unit operating pressure difference includes:

[0014] When the operating load of the unit is less than the preset minimum load, controlling the unit to load;

[0015] When the operating load of the unit is greater than or equal to the preset minimum load, the unit is controlled to be loaded and unloaded according to the terminal demand. At the same time, if the operating pressure difference of the unit is greater than or equal to the preset minimum pressure difference, the cooling water flow rate remains unchanged. If the operating pressure difference of the unit is less than the preset minimum pressure difference, the cooling water flow rate is reduced according to the operating pressure difference of the unit.

[0016] Optionally, adjusting the cooling tower fan air volume and cooling water flow rate according to the unit operating load and the unit operating pressure difference includes:

[0017] When the operating load of the unit is less than the preset minimum load, controlling the unit to load;

[0018] When the unit operating load is greater than or equal to the preset minimum load, the unit is controlled to be loaded and unloaded according to the terminal demand. At the same time, if the unit operating pressure difference is greater than or equal to the preset minimum pressure difference, the cooling tower fan air volume and cooling water flow rate remain unchanged. If the unit operating pressure difference is less than the preset minimum pressure difference, the following operations are performed:

[0019] First, reduce the cooling tower fan air volume according to the unit operating pressure difference. If the cooling tower fan air volume is adjusted to the preset minimum air volume but the unit operating pressure difference is still less than the preset minimum pressure difference, reduce the cooling water flow according to the unit operating pressure difference, or,

[0020] First, reduce the cooling water flow rate according to the operating pressure difference of the unit. If the cooling water flow rate is adjusted to the preset minimum flow rate but the operating pressure difference of the unit is still less than the preset minimum pressure difference, reduce the cooling tower fan air volume according to the operating pressure difference of the unit.

[0021] Optionally, reducing the cooling water flow rate according to the operating pressure difference of the unit includes:

[0022] Calculate D = a × (ΔP - ΔP0) × D0 + D0 to obtain the target parameter value of the cooling water flow rate, and reduce the frequency of the cooling water pump or the opening of the valve on the cooling water circuit according to the target parameter value of the cooling water flow rate;

[0023] Wherein, D represents the target parameter value of the cooling water flow rate, a represents the first proportional coefficient, △P represents the current unit operating pressure difference, △P0 represents the preset minimum pressure difference, and D0 represents the current parameter value of the cooling water flow rate.

[0024] Optionally, reducing the air volume of the cooling tower fan according to the operating pressure difference of the unit includes:

[0025] Calculate E=b×(ΔP-ΔP0)×E0+E0 to obtain the target parameter value of the cooling tower fan air volume, and reduce the frequency of the cooling tower fan according to the target parameter value of the cooling tower fan air volume;

[0026] Among them, E represents the target parameter value of the cooling tower fan air volume, b represents the second proportional coefficient, △P represents the current unit operating pressure difference, △P0 represents the preset minimum pressure difference, and E0 represents the current parameter value of the cooling tower fan air volume.

[0027] Optionally, after determining the temperature range of the cooling water temperature parameter, the method further includes:

[0028] If the cooling water temperature parameter is greater than or equal to the first temperature threshold and less than the corresponding third temperature threshold, the cooling tower fan air volume and cooling water flow rate remain unchanged;

[0029] If the cooling water temperature parameter is greater than or equal to the third temperature threshold, the cooling tower fan air volume and cooling water flow are both normally controlled, and the normal control means controlling the cooling tower fan air volume and cooling water flow according to the demand on the cooling tower side.

[0030] Optionally, the cooling water temperature parameter includes the cooling water inlet temperature or the cooling water outlet temperature.

[0031] The present invention also provides a chiller control device, comprising:

[0032] Detection module, used to detect cooling water temperature parameters;

[0033] A determination module, configured to determine a temperature range in which the cooling water temperature parameter is located;

[0034] The regulating module is used to regulate the cooling water flow rate and / or the cooling tower fan air volume according to the cooling water temperature parameter, the unit operating load and the unit operating pressure difference if the cooling water temperature parameter is less than the corresponding first temperature threshold, and return to the step of detecting the cooling water temperature parameter, and repeat this cycle. When the unit operating pressure difference is greater than or equal to the preset minimum pressure difference or when the cooling water flow rate and the cooling tower fan air volume cannot be further reduced, the current cooling water flow rate and cooling tower fan air volume are kept unchanged.

[0035] An embodiment of the present invention further provides a chiller, comprising: the chiller control device described in the embodiment of the present invention.

[0036] An embodiment of the present invention further provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method described in the embodiment of the present invention when executing the computer program.

[0037] An embodiment of the present invention further provides a non-volatile computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the method described in the embodiment of the present invention are implemented.

[0038] By applying the technical solution of the present invention, the cooling water temperature parameters are detected. When the cooling water temperature parameters are lower than the corresponding first temperature threshold, the cooling water flow rate and / or the cooling tower fan air volume are adjusted according to the cooling water temperature parameters, the unit operating load and the unit operating pressure difference, so that the unit operating pressure difference can be increased, and the water flow rate and / or air volume on the cooling tower side can be controlled according to the data on the unit side. Through the intelligent linkage control of the unit side and the cooling tower side, the unit operating pressure difference can meet the requirements, so that the chiller can start and operate normally under low cooling water temperature conditions, ensuring the safety and reliability of the chiller operation under low cooling water temperature conditions, and solving the problem in the prior art that the chiller cannot operate normally when the cooling water temperature is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a flow chart of a chiller control method provided by an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the intelligent control process for low cooling water temperature operation provided by an embodiment of the present invention;

[0041] Figure 3 This is a structural block diagram of a chiller control device provided by an embodiment of the present invention;

[0042] Figure 4 It is a schematic diagram of the hardware structure of the electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the description, claims, and drawings of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products, or apparatus.

[0045] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0046] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0047] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] Example 1

[0049] The chiller includes a refrigerant circulation loop formed by a compressor, a condenser, a throttling element, and an evaporator connected in sequence. The condenser includes a cooling water inlet and a cooling water outlet, which are connected to the cooling tower via the cooling water inlet and outlet, forming a cooling water circuit. That is, the cooling water inlet is connected to the cooling tower outlet via a cooling water inlet pipe, and the cooling water outlet is connected to the cooling tower inlet via a cooling water outlet pipe. The refrigerant and the cooling water exchange heat in the condenser. The evaporator includes a chilled water inlet and a chilled water outlet, which are connected to the terminal via the chilled water inlet and outlet, forming a chilled water circuit. The refrigerant and the chilled water exchange heat in the evaporator to provide the terminal with low-temperature cold water that meets user needs.

[0050] A first temperature sensor may be provided at the cooling water inlet to detect the cooling water inlet temperature, i.e., the cooling water temperature flowing into the condenser. A second temperature sensor may be provided at the cooling water outlet to detect the cooling water outlet temperature, i.e., the cooling water temperature flowing out of the condenser.

[0051] A cooling water pump is installed in the cooling water circuit to provide power for the cooling water circulation. The cooling water pump can be installed in the cooling water inlet or outlet pipe. If the cooling water pump is a variable frequency pump, the cooling water flow rate in the cooling water circuit can be adjusted by changing the cooling water pump frequency. If the cooling water pump is a fixed frequency pump, a valve can be installed in the cooling water inlet or outlet pipe to adjust the cooling water flow rate in the cooling water circuit by changing the valve opening.

[0052] The cooling tower fan is installed at the cooling tower to cool the cooling water flowing from the condenser to the cooling tower so that the cooling water can be recycled. The air volume of the cooling tower fan can be adjusted by changing the frequency of the cooling tower fan.

[0053] In the prior art, when a chiller is operating, the cooling tower fan and cooling water flow rate are controlled directly based on the cooling tower's demand. For example, the cooling tower fan is turned on when the water temperature in the cooling tower is too high, and the cooling tower fan is turned off when the water temperature drops to the target temperature. Furthermore, the cooling water flow rate is increased when the water temperature in the cooling tower is too high. However, this control method cannot effectively control the water temperature when the cooling water inlet temperature is low (for example, below 18°C), and thus cannot establish the unit's operating pressure difference, resulting in the unit not being able to operate normally.

[0054] In order to solve the problem in the prior art that a chiller cannot operate normally when the cooling water temperature is low, this embodiment provides a chiller control method. Figure 1 Flowchart of the chiller control method provided by the embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0055] S101, detecting cooling water temperature parameters.

[0056] S102: Determine the temperature range of the cooling water temperature parameter.

[0057] S103, if the cooling water temperature parameter is less than its corresponding first temperature threshold, adjust the cooling water flow and / or cooling tower fan air volume according to the cooling water temperature parameter, the unit operating load and the unit operating pressure difference, return to the step of detecting the cooling water temperature parameter, and repeat this cycle. When the unit operating pressure difference is greater than or equal to the preset minimum pressure difference or when the cooling water flow and cooling tower fan air volume cannot continue to decrease, keep the current cooling water flow and cooling tower fan air volume unchanged.

[0058] The temperature of the cooling water can be known through the cooling water temperature parameters, and the cooling water temperature parameters can be detected in the cooling water circuit. Preferably, the cooling water temperature parameters include the cooling water inlet temperature or the cooling water outlet temperature. This embodiment can quickly and accurately judge the temperature of the cooling water by detecting the cooling water inlet temperature or the cooling water outlet temperature, which is conducive to timely taking corresponding control and adjustment to make the unit operating pressure difference meet the requirements, and ensure that the chiller can operate normally under low cooling water temperature conditions.

[0059] The first temperature threshold is used to measure whether the cooling water temperature meets the requirements for normal operation of the unit. If the cooling water temperature parameter is less than the corresponding first temperature threshold, it indicates that the current cooling water temperature does not meet the requirements for normal operation of the unit and requires appropriate control and adjustment. If the cooling water temperature parameter is greater than or equal to the corresponding first temperature threshold, it indicates that the current cooling water temperature meets the requirements for normal operation of the unit.

[0060] The value of the first temperature threshold corresponding to the cooling water inlet temperature is less than the value of the first temperature threshold corresponding to the cooling water outlet temperature. For example, the value of the first temperature threshold corresponding to the cooling water inlet temperature is A, and the value of the first temperature threshold corresponding to the cooling water outlet temperature is A', where A'>A. Exemplarily, the first temperature threshold corresponding to the cooling water inlet temperature can be a value slightly less than 18°C, such as 15°C, and the first temperature threshold corresponding to the cooling water outlet temperature can be 20°C.

[0061] The unit operating load can be calculated in real time based on the unit operating data using existing calculation methods, which will not be described in detail in this embodiment. Specifically, the unit operating pressure difference can be obtained by using a pressure sensor to detect the condensing pressure and evaporating pressure, and calculating the difference between the condensing pressure and the evaporating pressure.

[0062] Under the current load of the unit, its cooling capacity is certain. The cooling capacity is related to the cooling water flow rate × the cooling water inlet and outlet temperature difference. When the cooling water flow rate is reduced, the cooling water inlet and outlet temperature difference will increase, resulting in an increase in the condensing temperature and condensing pressure, thereby increasing the unit's operating pressure difference.

[0063] Reducing the air volume of the cooling tower fan can reduce the heat dissipation of the cooling water in the cooling tower, increase the cooling water inlet temperature, and cause the condensation temperature and condensation pressure to increase, thereby increasing the operating pressure difference of the unit.

[0064] The preset minimum pressure difference is the pressure difference that ensures the normal operation of the unit. The preset minimum pressure difference is greater than the unit's pressure difference protection value. For example, the preset minimum pressure difference is 100kPa. When the unit's operating pressure difference is less than or equal to the unit's pressure difference protection value, the unit will output a prompt and perform a protective shutdown.

[0065] When the cooling water flow and the cooling tower fan air volume cannot be reduced further, even if the unit operating pressure difference is still lower than the preset minimum pressure difference, the unit can still operate normally, because the unit operating pressure difference has been increased by adjusting the cooling water flow and the cooling tower fan air volume, and it is definitely higher than the unit pressure difference protection value. Even if it is slightly lower than the preset minimum pressure difference, the unit can still operate normally.

[0066] This embodiment detects the cooling water temperature parameter. When the cooling water temperature parameter is less than the corresponding first temperature threshold, the cooling water flow rate and / or the cooling tower fan air volume are adjusted according to the cooling water temperature parameter, the unit operating load and the unit operating pressure difference, which can increase the unit operating pressure difference, and control the water flow rate and / or air volume on the cooling tower side according to the data on the unit side. Through the intelligent linkage control of the unit side and the cooling tower side, the unit operating pressure difference can meet the requirements, so that the chiller can start and operate normally under low cooling water temperature conditions, ensuring the safety and reliability of the chiller operation under low cooling water temperature conditions, and solving the problem in the prior art that the chiller cannot operate normally when the cooling water temperature is low.

[0067] For the interval in which the cooling water temperature parameter described in step S103 is less than the corresponding first temperature threshold, finer intervals can be further divided to achieve more detailed, efficient, intelligent control. Specifically, adjusting the cooling water flow rate and / or the cooling tower fan air volume according to the cooling water temperature parameter, the unit operating load, and the unit operating pressure difference includes:

[0068] If the cooling water temperature parameter is lower than the corresponding second temperature threshold, the cooling tower fan is turned off, and the cooling water flow rate is adjusted according to the unit operating load and the unit operating pressure difference;

[0069] If the cooling water temperature parameter is greater than or equal to the second temperature threshold and less than the first temperature threshold, the cooling tower fan is turned on, and the cooling tower fan air volume and cooling water flow are adjusted according to the unit operating load and the unit operating pressure difference.

[0070] Among them, the second temperature threshold is used to measure the degree of low cooling water temperature. The second temperature threshold corresponding to the cooling water inlet temperature is less than the first temperature threshold corresponding to the cooling water inlet temperature, and the second temperature threshold corresponding to the cooling water outlet temperature is less than the first temperature threshold corresponding to the cooling water outlet temperature. The value of the second temperature threshold corresponding to the cooling water inlet temperature is less than the value of the second temperature threshold corresponding to the cooling water outlet temperature. For example, the value of the second temperature threshold corresponding to the cooling water inlet temperature is B, and the value of the second temperature threshold corresponding to the cooling water outlet temperature is B', and B'>B. Exemplarily, the second temperature threshold corresponding to the cooling water inlet temperature can be 10°C, and the second temperature threshold corresponding to the cooling water outlet temperature can be 15°C.

[0071] In this embodiment, if the cooling water temperature parameter is less than the second temperature threshold, it means that the cooling water temperature is low at this time, and the cooling water in the cooling tower does not need to dissipate heat. Therefore, the cooling tower fan is turned off, and the unit operating pressure difference is increased by adjusting the cooling water flow rate accordingly; if the cooling water temperature parameter is greater than or equal to the second temperature threshold and less than the first temperature threshold, it means that the cooling water temperature is slightly low at this time, and the cooling tower fan can be turned on. Accordingly, the unit operating pressure difference can be increased by adjusting the cooling tower fan air volume and cooling water flow rate. Under low cooling water temperature conditions, this embodiment adopts corresponding control measures according to the temperature range of the cooling water temperature parameter, realizes more detailed, efficient and intelligent control, can quickly and specifically meet the unit operating pressure difference requirements, and thus ensures that the chiller can start and operate normally under low cooling water temperature conditions.

[0072] Furthermore, when the cooling water temperature parameter is less than a second temperature threshold, adjusting the cooling water flow rate according to the unit operating load and the unit operating pressure difference includes:

[0073] When the operating load of the unit is less than the preset minimum load, controlling the unit to load to increase the actual operating load of the unit;

[0074] When the operating load of the unit is greater than or equal to the preset minimum load, the unit is controlled to be loaded and unloaded according to the terminal demand. At the same time, if the operating pressure difference of the unit is greater than or equal to the preset minimum pressure difference, the cooling water flow rate remains unchanged. If the operating pressure difference of the unit is less than the preset minimum pressure difference, the cooling water flow rate is reduced according to the operating pressure difference of the unit.

[0075] The preset minimum load is the minimum load at which the unit can operate, for example, the preset minimum load is 30% to 40% load. The unit can be loaded and unloaded by existing control means, that is, controlling the refrigerant circulation (increasing or decreasing the compressor frequency, etc.). For example, the unit can be loaded and unloaded according to the actual water temperature and the target water temperature on the freezing side. When the actual water temperature is higher than the target water temperature, loading is required. When the actual water temperature is stable near the target water temperature, the current load state is maintained. When the actual water temperature is lower than the target water temperature, unloading is required.

[0076] In this embodiment, when the cooling water temperature parameter is less than the second temperature threshold, the cooling water flow rate is adjusted according to the unit operating load and the unit operating pressure difference. By reducing the cooling water flow rate, the cooling water inlet and outlet water temperature difference can be increased, thereby increasing the unit operating pressure difference, quickly meeting the unit operating pressure difference requirement, ensuring that the chiller can start and operate normally under low cooling water temperature conditions, and ensuring that the chiller can operate safely, reliably and efficiently under low cooling water temperature conditions.

[0077] Furthermore, when the cooling water temperature parameter is greater than or equal to the second temperature threshold and less than the first temperature threshold, adjusting the cooling tower fan air volume and cooling water flow rate according to the unit operating load and the unit operating pressure difference includes:

[0078] When the operating load of the unit is less than the preset minimum load, controlling the unit to load to increase the actual operating load of the unit;

[0079] When the unit operating load is greater than or equal to the preset minimum load, the unit is controlled to be loaded and unloaded according to the terminal demand. At the same time, if the unit operating pressure difference is greater than or equal to the preset minimum pressure difference, the cooling tower fan air volume and cooling water flow rate remain unchanged. If the unit operating pressure difference is less than the preset minimum pressure difference, the following operations are performed:

[0080] First, reduce the cooling tower fan air volume according to the operating pressure difference of the unit (the cooling water flow rate remains unchanged at this time). If the cooling tower fan air volume is adjusted to the preset minimum air volume but the operating pressure difference of the unit is still less than the preset minimum pressure difference, reduce the cooling water flow rate according to the operating pressure difference of the unit (the cooling tower fan air volume remains at the preset minimum air volume at this time), or,

[0081] First, reduce the cooling water flow rate according to the operating pressure difference of the unit (the cooling tower fan air volume remains unchanged at this time). If the cooling water flow rate is adjusted to the preset minimum flow rate but the operating pressure difference of the unit is still less than the preset minimum pressure difference, reduce the cooling tower fan air volume according to the operating pressure difference of the unit (the cooling water flow rate remains at the preset minimum flow rate).

[0082] In this embodiment, when the cooling water temperature parameter is greater than or equal to the second temperature threshold and less than the first temperature threshold, the cooling tower fan is turned on. The operating pressure difference of the unit can be increased by adjusting the cooling tower fan air volume and the cooling water flow rate. Specifically, the cooling water flow rate can be reduced first and then the cooling tower fan air volume, or the cooling tower fan air volume can be reduced first and then the cooling water flow rate. Considering that adjusting the water flow rate will affect the load regulation and operational stability of the unit to a certain extent, and adjusting the air volume has no significant effect on the unit, it is preferred to first reduce the cooling tower fan air volume and then reduce the cooling water flow rate. This can quickly meet the unit's operating pressure difference requirement so that the chiller can start and operate normally under low cooling water temperature conditions, while also ensuring the stability of the unit's operation.

[0083] The preset minimum flow is the minimum cooling water flow allowed by the unit. When the cooling water flow drops to the preset minimum flow, it means that the cooling water flow cannot be further reduced and the minimum flow remains unchanged.

[0084] The preset minimum air volume is the minimum air volume of the cooling tower fan allowed by the unit. When the cooling tower fan air volume drops to the preset minimum air volume, it means that the cooling tower fan air volume cannot be further reduced and the minimum air volume remains unchanged.

[0085] As a preferred embodiment, the cooling water flow rate can be reduced in the following manner: calculate D = a × (△P-△P0) × D0 + D0 to obtain the target parameter value of the cooling water flow rate, and reduce the frequency of the cooling water pump or the opening of the valve on the cooling water circuit according to the target parameter value of the cooling water flow rate.

[0086] Where D represents the target parameter value of the cooling water flow rate, a represents the first proportional coefficient, ΔP represents the current unit operating pressure difference, ΔP0 represents the preset minimum pressure difference, and D0 represents the current parameter value of the cooling water flow rate. The value range of the first proportional coefficient a can be [0.5, 1.0].

[0087] The cooling water flow parameter can be the cooling water pump frequency, the opening of the valve in the cooling water circuit, or the cooling water flow value. When the cooling water flow drops to the preset minimum flow, the cooling water flow will no longer be reduced and the minimum flow will remain unchanged.

[0088] Based on the above formula, this embodiment can more accurately and quickly reduce the cooling water flow rate to increase the operating pressure difference of the unit.

[0089] As a preferred embodiment, the cooling tower fan air volume can be reduced by calculating E=b×(△P-△P0)×E0+E0 to obtain the target parameter value of the cooling tower fan air volume, and reducing the frequency of the cooling tower fan according to the target parameter value of the cooling tower fan air volume.

[0090] Where E represents the target parameter value for the cooling tower fan air volume, b represents the second proportional coefficient, ΔP represents the current unit operating pressure difference, ΔP0 represents the preset minimum pressure difference, and E0 represents the current parameter value for the cooling tower fan air volume. The second proportional coefficient b can range from [0.5 to 1.0].

[0091] The parameter value of the cooling tower fan air volume can be the cooling tower fan frequency or the cooling tower fan air volume value. When the cooling tower fan air volume drops to the preset minimum air volume, the cooling tower fan air volume will no longer be further reduced and the minimum air volume will remain unchanged.

[0092] Based on the above formula, this embodiment can more accurately and quickly reduce the air volume of the cooling tower fan to increase the operating pressure difference of the unit.

[0093] In one embodiment, after determining the temperature range of the cooling water temperature parameter, the method further includes:

[0094] If the cooling water temperature parameter is greater than or equal to the first temperature threshold and less than the corresponding third temperature threshold, the cooling tower fan air volume and cooling water flow rate remain unchanged;

[0095] If the cooling water temperature parameter is greater than or equal to the third temperature threshold, the cooling tower fan air volume and cooling water flow are both normally controlled, and the normal control means controlling the cooling tower fan air volume and cooling water flow according to the demand on the cooling tower side.

[0096] Among them, the third temperature threshold can be the cooling water temperature threshold at which the unit can start and operate normally. The third temperature threshold corresponding to the cooling water inlet temperature is greater than the first temperature threshold corresponding to the cooling water inlet temperature, and the third temperature threshold corresponding to the cooling water outlet temperature is greater than the first temperature threshold corresponding to the cooling water outlet temperature. The value of the third temperature threshold corresponding to the cooling water inlet temperature is less than the value of the third temperature threshold corresponding to the cooling water outlet temperature. For example, the value of the third temperature threshold corresponding to the cooling water inlet temperature is C, and the value of the third temperature threshold corresponding to the cooling water outlet temperature is C', C'>C. Exemplarily, the third temperature threshold corresponding to the cooling water inlet temperature can be 18°C, and the third temperature threshold corresponding to the cooling water outlet temperature can be 23°C.

[0097] When the cooling water temperature parameter is greater than or equal to the first temperature threshold and less than the third temperature threshold, it means that the cooling water temperature parameter is slightly lower than the third temperature threshold. It can be considered that this state can meet the normal startup and operation of the unit, so the cooling tower fan air volume and cooling water flow remain unchanged.

[0098] When the cooling water temperature parameter is greater than or equal to the third temperature threshold, it means that this is not a low cooling water temperature operating condition and can meet the normal startup and operation of the unit. Therefore, the cooling tower fan air volume and cooling water flow are both controlled normally.

[0099] This embodiment is divided into four control stages according to the cooling water temperature parameters. Through the comprehensive control of the four stages, it can ensure that the unit can achieve safe and efficient operation under different cooling water temperature conditions.

[0100] During unit operation, the detected cooling water temperature parameter may be in any control stage, and control is performed directly according to the corresponding operation of the control stage. Regardless of the temperature range of the cooling water temperature parameter, the unit is controlled to be loaded or unloaded based on the terminal demand (for example, the deviation between the actual water temperature and the target water temperature).

[0101] Example 2

[0102] This embodiment provides a specific implementation of the chiller control method based on the above embodiment. Explanations of terms that are the same or corresponding to those in the above embodiment are not repeated in this embodiment. This specific embodiment is intended only to better illustrate this application and does not constitute an undue limitation of this application.

[0103] This embodiment combines the chiller unit itself and the cooling tower fan and cooling water pump on the cooling tower side to achieve normal startup and operation of the unit under low cooling water temperature conditions. This embodiment is explained by taking the cooling water temperature parameter as the cooling water inlet temperature as an example.

[0104] According to the cooling water inlet temperature T, it is divided into four control stages:

[0105] (1) In the first stage, T<T1, T1 is the second temperature threshold mentioned above. In order to ensure the normal operation of the unit under low cooling water temperature, the cooling tower fan is in the off state during this stage. When the unit is turned on, the unit will be quickly loaded through intelligent loading and unloading control to increase the unit operating load and establish the system operating pressure difference △P (that is, the unit operating pressure difference = condensing pressure - evaporating pressure). When the unit operating load Q≥Q0, Q0 represents the preset minimum load. Compare the unit operating pressure difference △P with the preset minimum pressure difference △P0. If △P≥△P0, the unit will maintain the current state and continue to operate. If △P<△P0, reduce the cooling water flow D to increase the cooling water inlet and outlet water temperature difference, thereby increasing the unit operating pressure difference to ensure the normal operation of the unit.

[0106] The specific control methods are as follows:

[0107] When Q<Q0, the unit is controlled to load intelligently and the actual operating load Q of the unit is increased;

[0108] When Q≥Q0 and △P≥△P0, the load maintains intelligent loading and the cooling water flow rate D remains unchanged;

[0109] When Q ≥ Q0 and ΔP < ΔP0, the load remains intelligently loaded, and the cooling water flow rate D is reduced. In this state, the cooling water flow rate is adjusted and controlled as follows: D = a × (ΔP - ΔP0) × D0 + D0. The meaning of the parameters in this formula is omitted for clarity; refer to Example 1 for details. When the cooling water flow rate D drops to the unit's preset minimum allowable flow rate, Dmin, it is no longer reduced and remains unchanged.

[0110] (2) In the second stage, T1≤T<T2, where T2 is the first temperature threshold mentioned above. At this time, the cooling water inlet temperature is slightly higher than that in the first stage. When the unit is started, it is first loaded quickly through intelligent loading control. When the actual unit operating load Q>Q0, the unit operating pressure difference △P is compared with the preset minimum pressure difference △P0. If △P≥△P0, the unit is kept in the current state and continues to operate. When △P<△P0 is detected, since the cooling tower fan has been turned on in the second stage, the cooling tower fan air volume E is first adjusted. If the cooling tower fan air volume E has dropped to the preset minimum air volume Emin allowed by the unit, but △P is still less than △P0 at this time, the cooling water flow D is further adjusted to meet the unit operating pressure difference.

[0111] The specific control methods are as follows:

[0112] When Q<Q0, the unit is controlled to load intelligently and the actual operating load Q of the unit is increased;

[0113] When Q≥Q0 and △P≥△P0, the load is kept intelligently loaded, and the cooling water flow D and the cooling tower fan air volume E remain unchanged;

[0114] When Q ≥ Q0 and ΔP < ΔP0, the load is maintained intelligently, the cooling water flow rate D remains unchanged, and the cooling tower fan air volume E is adjusted according to the actual operating pressure difference. The adjustment control method is: E = b × (ΔP - ΔP0) × E0 + E0. The meaning of the parameters in the formula is not repeated here, and reference can be made to Example 1. When the cooling tower fan air volume E drops to the preset minimum air volume Emin allowed by the unit, if ΔP < ΔP0 at this time, the cooling tower fan air volume E remains unchanged at Emin, and the cooling water flow rate D is further controlled. The cooling water flow rate is specifically controlled in the manner described in the first stage, which is not repeated here.

[0115] (3) The third stage, T2≤T<T3, T3 is the third temperature threshold mentioned above, at this time the unit continues to operate according to the current intelligent loading and unloading state, and the cooling tower fan air volume and cooling water flow remain unchanged at the current state.

[0116] (4) The fourth stage, T≥T3, at this time the cooling water inlet temperature is normal, the unit load, cooling tower fan air volume and cooling water flow are all under normal control.

[0117] Through the comprehensive control of the above four stages, it can be ensured that the unit can operate safely and efficiently under different cooling water temperature conditions.

[0118] like Figure 2 The figure shows a schematic diagram of the intelligent control process for low cooling water temperature operation. Taking the cooling water flow rate adjusted by a variable frequency water pump as an example, the process includes the following steps:

[0119] S201, detecting the cooling water inlet temperature T.

[0120] S202, determine that T<T1.

[0121] S203, the cooling tower fan is turned off.

[0122] S204, intelligent and rapid loading of the unit, this step is performed simultaneously with step S203.

[0123] S205, determine whether T<T1 and Q≥Q0 are satisfied. If so, proceed to S206. If not, return to S201 and continue to detect the cooling water inlet temperature T.

[0124] S206: Intelligently adjust the water pump flow rate according to the unit operating pressure difference ΔP.

[0125] S207, determine that T1≤T<T2.

[0126] S208, intelligent and fast loading of the unit.

[0127] S209, determine whether T1≤T<T2 and Q≥Q0 are satisfied. If so, proceed to S210. If not, return to S201 and continue to detect the cooling water inlet temperature T.

[0128] S210, intelligently adjust the cooling tower fan according to the unit operating pressure difference ΔP.

[0129] S211, determine whether T1≤T<T2, Q≥Q0 and E=Emin are satisfied. If so, go to S212, if not, return to S209.

[0130] S212, intelligently adjust the water pump flow according to the unit operating pressure difference △P.

[0131] S213, determine that T2≤T<T3.

[0132] S214, the cooling tower fan and water pump remain in their current state.

[0133] S215, determine that T≥T3.

[0134] S216, each device performs normal control.

[0135] This embodiment provides an intelligent control solution for a chiller operating under low cooling water temperature conditions. Through intelligent linkage control between the unit side and the cooling tower side, the chiller can start and operate normally under low cooling water temperature conditions, ensuring the safe and reliable operation of the chiller under low cooling water temperature conditions.

[0136] Example 3

[0137] Based on the same inventive concept, this embodiment provides a chiller control device that can be used to implement the chiller control method described in the above embodiment. The chiller control device can be implemented through software and / or hardware.

[0138] Figure 3 : is a structural block diagram of a chiller control device provided by an embodiment of the present invention, such as Figure 3 As shown, the chiller control device includes:

[0139] Detection module 31, used to detect cooling water temperature parameters;

[0140] A determination module 32 is used to determine the temperature range of the cooling water temperature parameter;

[0141] The adjustment module 33 is used to adjust the cooling water flow rate and / or the cooling tower fan air volume according to the cooling water temperature parameter, the unit operating load and the unit operating pressure difference if the cooling water temperature parameter is less than the corresponding first temperature threshold, and return to the step of detecting the cooling water temperature parameter, and repeat this cycle. When the unit operating pressure difference is greater than or equal to the preset minimum pressure difference or when the cooling water flow rate and the cooling tower fan air volume cannot be further reduced, the current cooling water flow rate and cooling tower fan air volume are kept unchanged.

[0142] Optionally, the adjustment module 33 includes:

[0143] a first regulating unit, configured to shut down the cooling tower fan if the cooling water temperature parameter is less than its corresponding second temperature threshold, and to regulate the cooling water flow rate according to the unit operating load and the unit operating pressure difference;

[0144] The second regulating unit is used to turn on the cooling tower fan if the cooling water temperature parameter is greater than or equal to the second temperature threshold and less than the first temperature threshold, and adjust the cooling tower fan air volume and cooling water flow according to the unit operating load and the unit operating pressure difference.

[0145] Optionally, the first adjusting unit is specifically configured to:

[0146] When the operating load of the unit is less than the preset minimum load, controlling the unit to load;

[0147] When the operating load of the unit is greater than or equal to the preset minimum load, the unit is controlled to be loaded and unloaded according to the terminal demand. At the same time, if the operating pressure difference of the unit is greater than or equal to the preset minimum pressure difference, the cooling water flow rate remains unchanged. If the operating pressure difference of the unit is less than the preset minimum pressure difference, the cooling water flow rate is reduced according to the operating pressure difference of the unit.

[0148] Optionally, the second adjusting unit is specifically configured to:

[0149] When the operating load of the unit is less than the preset minimum load, controlling the unit to load;

[0150] When the unit operating load is greater than or equal to the preset minimum load, the unit is controlled to be loaded and unloaded according to the terminal demand. At the same time, if the unit operating pressure difference is greater than or equal to the preset minimum pressure difference, the cooling tower fan air volume and cooling water flow rate remain unchanged. If the unit operating pressure difference is less than the preset minimum pressure difference, the following operations are performed:

[0151] First, reduce the cooling tower fan air volume according to the unit operating pressure difference. If the cooling tower fan air volume is adjusted to the preset minimum air volume but the unit operating pressure difference is still less than the preset minimum pressure difference, reduce the cooling water flow according to the unit operating pressure difference, or,

[0152] First, reduce the cooling water flow rate according to the operating pressure difference of the unit. If the cooling water flow rate is adjusted to the preset minimum flow rate but the operating pressure difference of the unit is still less than the preset minimum pressure difference, reduce the cooling tower fan air volume according to the operating pressure difference of the unit.

[0153] Optionally, the first regulating unit and the second regulating unit reduce the cooling water flow rate by calculating D=a×(ΔP-ΔP0)×D0+D0 to obtain a target parameter value of the cooling water flow rate, and reducing the frequency of the cooling water pump or reducing the opening of the valve on the cooling water circuit according to the target parameter value of the cooling water flow rate;

[0154] Wherein, D represents the target parameter value of the cooling water flow rate, a represents the first proportional coefficient, △P represents the current unit operating pressure difference, △P0 represents the preset minimum pressure difference, and D0 represents the current parameter value of the cooling water flow rate.

[0155] Optionally, the second regulating unit reduces the air volume of the cooling tower fan by calculating E=b×(ΔP-ΔP0)×E0+E0 to obtain a target parameter value of the air volume of the cooling tower fan, and reducing the frequency of the cooling tower fan according to the target parameter value of the air volume of the cooling tower fan;

[0156] Among them, E represents the target parameter value of the cooling tower fan air volume, b represents the second proportional coefficient, △P represents the current unit operating pressure difference, △P0 represents the preset minimum pressure difference, and E0 represents the current parameter value of the cooling tower fan air volume.

[0157] Optionally, the chiller control device further includes:

[0158] A first control module, configured to keep the cooling tower fan air volume and cooling water flow rate unchanged if the cooling water temperature parameter is greater than or equal to the first temperature threshold and less than the corresponding third temperature threshold;

[0159] The second control module is used to control the cooling tower fan air volume and cooling water flow normally if the cooling water temperature parameter is greater than or equal to the third temperature threshold. The normal control refers to controlling the cooling tower fan air volume and cooling water flow according to the demand on the cooling tower side.

[0160] The above-mentioned chiller control device can execute the chiller control method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not fully described in this embodiment, please refer to the chiller control method provided by the embodiment of the present invention.

[0161] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0162] Example 4

[0163] This embodiment provides a chiller, including: the chiller control device described in the above embodiment.

[0164] Example 5

[0165] This embodiment provides a non-volatile computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the chiller control method described in the above embodiment is implemented.

[0166] Example 6

[0167] This embodiment provides an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the chiller control method described in the above embodiment is implemented.

[0168] Figure 4FIG. 1 is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present invention. Figure 4 As shown, the electronic device includes: one or more processors 410 and a memory 420, Figure 4 The electronic device may further include an input device 430 and an output device 440.

[0169] The processor 410, the memory 420, the input device 430 and the output device 440 may be connected via a bus or other means. Figure 4 The bus connection is taken as an example.

[0170] Memory 420, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the chiller control method in the embodiments of the present invention. Processor 410 executes the non-volatile software programs, instructions, and modules stored in memory 420 to perform various functional applications and data processing, thereby implementing the chiller control method described above.

[0171] Memory 420 may include a program storage area and a data storage area. The program storage area may store application programs required for operating the device and at least one function, while the data storage area may store unit operating data, thresholds, etc. Furthermore, memory 420 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state memory device.

[0172] The input device 430 may receive input digital or character information and generate key signal input related to user settings and function control of the electronic device. The output device 440 may include a display device such as a display screen.

[0173] The one or more modules are stored in the memory 420 and, when executed by the one or more processors 410 , perform the above-mentioned chiller control method.

[0174] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0175] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A chiller control method, characterized in that: include: Detect cooling water temperature parameters; Determining the temperature range of the cooling water temperature parameter; If the cooling water temperature parameter is less than its corresponding first temperature threshold, the cooling water flow rate and / or cooling tower fan air volume are adjusted according to the cooling water temperature parameter, the unit operating load and the unit operating pressure difference, and the step of detecting the cooling water temperature parameter is returned to be executed. This cycle is repeated. When the unit operating pressure difference is greater than or equal to the preset minimum pressure difference or when the cooling water flow rate and the cooling tower fan air volume cannot be further reduced, the current cooling water flow rate and cooling tower fan air volume are kept unchanged.

2. The method according to claim 1, characterized in that Adjusting the cooling water flow rate and / or the cooling tower fan air volume according to the cooling water temperature parameters, the unit operating load and the unit operating pressure difference includes: If the cooling water temperature parameter is lower than the corresponding second temperature threshold, the cooling tower fan is turned off, and the cooling water flow rate is adjusted according to the unit operating load and the unit operating pressure difference; If the cooling water temperature parameter is greater than or equal to the second temperature threshold and less than the first temperature threshold, the cooling tower fan is turned on, and the cooling tower fan air volume and cooling water flow are adjusted according to the unit operating load and the unit operating pressure difference.

3. The method according to claim 2, characterized in that Adjusting the cooling water flow rate according to the unit operating load and the unit operating pressure difference includes: When the operating load of the unit is less than the preset minimum load, controlling the unit to load; When the operating load of the unit is greater than or equal to the preset minimum load, the unit is controlled to be loaded and unloaded according to the terminal demand. At the same time, if the operating pressure difference of the unit is greater than or equal to the preset minimum pressure difference, the cooling water flow rate remains unchanged. If the operating pressure difference of the unit is less than the preset minimum pressure difference, the cooling water flow rate is reduced according to the operating pressure difference of the unit.

4. The method according to claim 2, characterized in that Adjusting the cooling tower fan air volume and cooling water flow rate according to the unit operating load and the unit operating pressure difference includes: When the operating load of the unit is less than the preset minimum load, controlling the unit to load; When the unit operating load is greater than or equal to the preset minimum load, the unit is controlled to be loaded and unloaded according to the terminal demand. At the same time, if the unit operating pressure difference is greater than or equal to the preset minimum pressure difference, the cooling tower fan air volume and cooling water flow rate remain unchanged. If the unit operating pressure difference is less than the preset minimum pressure difference, the following operations are performed: First, reduce the cooling tower fan air volume according to the unit operating pressure difference. If the cooling tower fan air volume is adjusted to the preset minimum air volume but the unit operating pressure difference is still less than the preset minimum pressure difference, reduce the cooling water flow according to the unit operating pressure difference, or, First, reduce the cooling water flow rate according to the operating pressure difference of the unit. If the cooling water flow rate is adjusted to the preset minimum flow rate but the operating pressure difference of the unit is still less than the preset minimum pressure difference, reduce the cooling tower fan air volume according to the operating pressure difference of the unit.

5. The method according to claim 3 or 4, characterized in that Adjust the cooling water flow rate according to the operating pressure difference of the unit, including: Calculate D = a × (ΔP - ΔP0) × D0 + D0 to obtain the target parameter value of the cooling water flow rate, and reduce the frequency of the cooling water pump or the opening of the valve on the cooling water circuit according to the target parameter value of the cooling water flow rate; Wherein, D represents the target parameter value of the cooling water flow rate, a represents the first proportional coefficient, △P represents the current unit operating pressure difference, △P0 represents the preset minimum pressure difference, and D0 represents the current parameter value of the cooling water flow rate.

6. The method according to claim 4, characterized in that Adjust the cooling tower fan air volume according to the operating pressure difference of the unit, including: Calculate E = b × (ΔP - ΔP0) × E0 + E0 to obtain a target parameter value for the cooling tower fan air volume, and reduce the frequency of the cooling tower fan according to the target parameter value for the cooling tower fan air volume; Among them, E represents the target parameter value of the cooling tower fan air volume, b represents the second proportional coefficient, △P represents the current unit operating pressure difference, △P0 represents the preset minimum pressure difference, and E0 represents the current parameter value of the cooling tower fan air volume.

7. The method according to any one of claims 1 to 4, characterized in that After determining the temperature range of the cooling water temperature parameter, the method further includes: If the cooling water temperature parameter is greater than or equal to the first temperature threshold and less than the corresponding third temperature threshold, the cooling tower fan air volume and cooling water flow rate remain unchanged; If the cooling water temperature parameter is greater than or equal to the third temperature threshold, the cooling tower fan air volume and cooling water flow are both normally controlled, and the normal control means controlling the cooling tower fan air volume and cooling water flow according to the demand on the cooling tower side.

8. The method according to any one of claims 1 to 4, characterized in that The cooling water temperature parameter includes the cooling water inlet temperature or the cooling water outlet temperature.

9. A chiller control device, characterized in that: include: Detection module, used to detect cooling water temperature parameters; A determination module, configured to determine a temperature range in which the cooling water temperature parameter is located; The regulating module is used to regulate the cooling water flow rate and / or the cooling tower fan air volume according to the cooling water temperature parameter, the unit operating load and the unit operating pressure difference if the cooling water temperature parameter is less than the corresponding first temperature threshold, and return to the step of detecting the cooling water temperature parameter, and repeat this cycle. When the unit operating pressure difference is greater than or equal to the preset minimum pressure difference or when the cooling water flow rate and the cooling tower fan air volume cannot be further reduced, the current cooling water flow rate and cooling tower fan air volume are kept unchanged.

10. A chiller, characterized in that: include: The chiller control device according to claim 9.

11. An electronic device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 8 when executing the computer program.

12. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

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