Variable frequency pump set control method and device, refrigeration equipment and storage medium

Abstract

The embodiment of the invention relates to a variable-frequency pump set control method and device, refrigeration equipment and a storage medium. By controlling a first water pump to be started, the number and the rotating speed of the started water pumps of the variable-frequency pump set are adjusted according to the total water outlet flow of the variable-frequency pump set; when the current total water outlet flow is larger than or equal to the flow threshold value, the output power, the pressure difference and the actual water outlet flow of each started water pump are obtained; and for each started water pump, the rotating speed of the started water pump is adjusted according to the actual water outlet flow, the output power and the corresponding standard water outlet flow, and / or the rotating speed of the started water pump is adjusted according to the actual water outlet flow, the pressure difference and the corresponding standard water outlet flow. Therefore, the water outlet flow, the power and the pressure difference of all the water pumps in the variable frequency pump set can be monitored in real time, comparison and adjustment are conducted in combination with standard parameters set by the system, the start-stop state and the operation rotating speed of the water pumps can be dynamically adjusted, the operation stability of the system is improved, and the fault risk is reduced.

Description

Technical Field

[0001] The present invention relates to the field of liquid cooling system technology, and in particular to a variable frequency pump group control method, device, refrigeration equipment and storage medium. Background Technology

[0002] Liquid cooling units are highly efficient refrigeration devices that, due to their superior heat dissipation performance and lower energy consumption, are gradually replacing traditional air-cooling systems and are widely used in high-heat-density scenarios such as data centers, supercomputing platforms, and industrial-grade cooling equipment. Compared to air-cooling systems, liquid cooling systems have significant advantages in heat dissipation efficiency, energy consumption control, and space utilization, making them the mainstream solution for high-performance system cooling in the future.

[0003] In a liquid cooling system, the water pump is the core liquid supply component, and its performance directly affects the overall stability and energy efficiency of the system. Traditional water pumps mostly use fixed-frequency control, with a fixed operating speed, and cannot flexibly adjust the water flow and pressure according to load requirements.

[0004] Therefore, the urgent technical problem to be solved is: how to achieve intelligent monitoring and dynamic adjustment of variable frequency pump units in liquid cooling systems in order to improve operating efficiency, extend equipment life and reduce failure risk. Summary of the Invention

[0005] In view of this, in order to solve the above-mentioned technical problems or some of the technical problems, the present invention provides a variable frequency pump group control method, device, refrigeration equipment and storage medium.

[0006] In a first aspect, embodiments of the present invention provide a variable frequency pump group control method, wherein the variable frequency pump group includes multiple water pumps, and the method includes:

[0007] When the first water pump in the variable frequency pump set is turned on and the operating status meets the preset conditions, the total outflow rate of the variable frequency pump set is obtained.

[0008] The number and speed of the pumps activated by the variable frequency pump set are adjusted according to the total outflow rate.

[0009] If the current total outflow rate of the variable frequency pump set is greater than or equal to the flow rate threshold, then the output power, pressure difference of the water flow, and actual outflow rate of each pump that is turned on are obtained.

[0010] For each of the activated water pumps, the rotational speed of the activated water pump is adjusted according to the actual water flow rate, the output power, and the corresponding standard water flow rate, and / or, the rotational speed of the activated water pump is adjusted according to the actual water flow rate, the pressure difference, and the corresponding standard water flow rate.

[0011] In one possible implementation, controlling the first pump in the variable frequency pump set to start and ensuring its operating state meets preset conditions, and obtaining the total outflow rate of the variable frequency pump set, includes:

[0012] The first water pump of the variable frequency pump set is controlled to start and run according to the preset operating current and preset speed.

[0013] When the running time reaches the first duration, it is determined that the running state meets the preset conditions;

[0014] The flow rate of the first water pump is obtained as the total flow rate.

[0015] In one possible implementation, adjusting the number and speed of the pumps activated in the variable frequency pump set according to the total outflow includes:

[0016] When the total outflow rate is less than the flow threshold, the speed of the first water pump is increased within the speed range of the first water pump;

[0017] When the speed of the first water pump reaches the highest value of the speed range and the total outflow is less than the flow threshold, the number of water pumps to be turned on is increased by one, and the speed of the newly added water pump is adjusted within the speed range until the total outflow of all water pumps is greater than or equal to the flow threshold, at which point the adjustment ends.

[0018] In one possible implementation, obtaining the output power of each activated water pump, the pressure difference of the water flow, and the actual outflow rate includes:

[0019] For each water pump that is turned on, obtain the voltage, current, inlet pressure, outlet pressure, and actual outlet flow rate during operation;

[0020] Calculate the output power of each of the activated water pumps based on the voltage and the current;

[0021] The pressure difference of each activated water pump is calculated based on the outlet pressure and the inlet pressure.

[0022] In one possible implementation, adjusting the rotational speed of the pump based on the actual outflow rate, the output power, and the corresponding standard outflow rate, and / or adjusting the rotational speed of the pump based on the actual outflow rate, the pressure difference, and the corresponding standard outflow rate, includes:

[0023] Obtain the standard outlet flow rate corresponding to the output power from the correspondence between power and outlet flow rate, and / or obtain the standard outlet flow rate corresponding to the pressure difference from the correspondence between pressure difference and outlet flow rate;

[0024] When the difference between the actual water flow rate and the standard water flow rate is greater than a preset difference, the speed of the pump is adjusted so that each difference is less than or equal to the preset difference.

[0025] In one possible implementation, the method further includes:

[0026] If the number of times any water pump is turned on exceeds a preset number, and the difference is still greater than a preset difference, then the vibration parameters and / or noise parameters of the water pump are obtained.

[0027] Determine whether the currently activated water pump is malfunctioning based on the vibration parameters and / or the noise parameters.

[0028] In one possible implementation, the method further includes:

[0029] When it is determined that the start-up water pump has malfunctioned, the start-up water pump is controlled to stop running, and the step of adjusting the number and speed of the start-up water pumps of the variable frequency pump group according to the total outflow rate is re-executed;

[0030] When the number of activated water pumps reaches its maximum value, and the current total outflow rate is still less than the flow rate threshold, the rotation speed of each activated water pump is controlled to reach its maximum value.

[0031] Secondly, embodiments of the present invention provide a variable frequency pump set control device, wherein the variable frequency pump set includes multiple water pumps, and the device includes:

[0032] The control module is used to control the first water pump in the variable frequency pump set to start, and when the operating status meets the preset conditions, to obtain the total water flow rate of the variable frequency pump set.

[0033] The first adjustment module is used to adjust the number and speed of the pumps started by the variable frequency pump group according to the total outflow rate;

[0034] The acquisition module is used to acquire the output power, water pressure difference, and actual water flow of each pump when the current total outflow of the variable frequency pump group is greater than or equal to the flow threshold.

[0035] The second adjustment module is used to adjust the rotation speed of each of the activated water pumps according to the actual water flow rate, the output power and the corresponding standard water flow rate, and / or to adjust the rotation speed of the activated water pumps according to the actual water flow rate, the pressure difference and the corresponding standard water flow rate.

[0036] Thirdly, embodiments of the present invention provide a refrigeration device, including: a processor and a memory, wherein the processor is configured to execute a variable frequency pump group control program stored in the memory to implement the variable frequency pump group control method described in any one of the first aspects above.

[0037] Fourthly, embodiments of the present invention provide a storage medium storing one or more programs, which can be executed by one or more processors to implement the variable frequency pump group control method described in any one of the first aspects.

[0038] The variable frequency pump group control scheme provided in this invention obtains the total outflow rate of the variable frequency pump group by controlling the first pump in the variable frequency pump group to start and when the operating state meets preset conditions. The number and speed of the pumps in the variable frequency pump group are adjusted according to the total outflow rate. If the current total outflow rate of the variable frequency pump group is greater than or equal to a flow threshold, the output power, water pressure difference, and actual outflow rate of each pump are obtained. For each pump, the speed is adjusted according to the actual outflow rate, output power, and corresponding standard outflow rate, and / or, according to the actual outflow rate, pressure difference, and corresponding standard outflow rate. Therefore, by real-time monitoring of the outflow rate, power, and pressure difference of each pump in the variable frequency pump group, and comparing and adjusting with the standard parameters set by the system, the start / stop status and operating speed of the pumps can be dynamically adjusted. This achieves a coordinated match between the number of pumps and energy efficiency, improves the accuracy and stability of system operation, reduces energy consumption, and reduces the risk of failure. Attached Figure Description

[0039] Figure 1 A flowchart illustrating a variable frequency pump group control method provided in an embodiment of the present invention;

[0040] Figure 2 A flowchart illustrating another variable frequency pump group control method provided in an embodiment of the present invention;

[0041] Figure 3 A flowchart illustrating another variable frequency pump group control method provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of a variable frequency pump group control device provided in an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the structure of a refrigeration device provided in an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0046] Figure 1 This is a flowchart illustrating a variable frequency pump group control method provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the method specifically includes:

[0047] S11. When the first water pump in the variable frequency pump set is turned on and the operating status meets the preset conditions, obtain the total outflow rate of the variable frequency pump set.

[0048] The variable frequency pump group control method provided in this embodiment of the invention is applied to refrigeration equipment, which may include, but is not limited to, a liquid-cooled unit equipped with a variable frequency pump group. The variable frequency pump group consists of multiple water pumps. Specifically, by real-time monitoring of the water flow rate, power and pressure difference of each water pump in the variable frequency pump group, and comparing and adjusting with the standard parameters set by the system, the start-stop state and operating speed of the water pumps can be dynamically adjusted.

[0049] In this embodiment, after the variable frequency pump set is started, the first water pump in the pump set is turned on first. This water pump is a variable frequency water pump, which usually adopts a preset low speed and current (e.g., 50% of the rated speed) during initial operation to reduce inrush current and energy consumption. This is the initial liquid supply operation after the system is started, avoiding the waste of resources caused by starting multiple pumps at the beginning.

[0050] After the first water pump has been running for a period of time (e.g., 30 seconds), its operation is checked to see if its operating status meets the preset conditions. The judgment logic may include the following: the starting current is stable within the safe range, the speed reaches the initial set value (e.g., 50% of the rated speed), there are no abnormal starting conditions (e.g., vibration, noise or abnormal current), the flow acquisition device is operating normally and has measurement capabilities, etc.

[0051] Meeting the preset conditions indicates that the water pump is operating stably, safely, and measurably. Since only the first pump is currently running, the total outflow rate is equivalent to the outflow rate of the first pump, reflecting the current water supply capacity. This information is used to determine whether more pumps need to be started or the speed of the current pump needs to be adjusted. Therefore, the outflow rate of the first pump can be obtained after its safe start-up and used as the initial basis for subsequent intelligent adjustments, enabling on-demand control and energy-saving operation.

[0052] S12. Adjust the number and speed of the pumps started by the variable frequency pump set according to the total outflow rate.

[0053] In this embodiment, the system presets a target flow range. If the total outflow is less than the target flow range, the number of operating pumps is increased (e.g., from one to two); or the speed of existing pumps is increased. If the flow is within the target flow range, the current operating state is maintained. If the total outflow is greater than the target flow range, the number of operating pumps and their speed are appropriately reduced.

[0054] When adjusting the number of water pumps, the system automatically starts or stops the pumps as needed, and also supports rotating start / stop to avoid uneven wear caused by prolonged operation of a single pump. When adjusting the pump speed, each variable frequency pump is frequency-controlled via a frequency converter, allowing for fine adjustments such as from 45Hz to 50Hz and then to 55Hz, increasing flow rate without adding additional pumps. This step dynamically adjusts the number and frequency of pumps based on real-time total outflow, achieving intelligent decision-making according to system load. Multiple pumps work together to supply water, avoiding unnecessary energy consumption and equipment wear, balancing pump lifespan, improving system stability, and achieving optimal operating efficiency and energy-saving goals for the cooling system.

[0055] S13. If the current total outflow of the variable frequency pump set is greater than or equal to the flow threshold, then obtain the output power, water pressure difference, and actual outflow of each pump that is turned on.

[0056] In this embodiment, the total outflow rate is the outflow rate of all water pumps after adjusting the number of water pumps in the previous step. A flow rate threshold is preset as the basis for determining whether to proceed to the next adjustment. When the current total outflow rate of the variable frequency pump set is greater than or equal to the flow rate threshold, it indicates that the basic water supply demand has been met, and at this time, the focus can shift to efficiency optimization.

[0057] For each water pump currently in operation, the following operating parameters are obtained: output power, which represents the electrical power currently consumed by the pump, usually calculated from current and voltage; pressure difference, which represents the pressure difference between the pump inlet and outlet, collected by a pressure sensor; and actual water flow rate, which represents the current flow output of the pump, obtained from a built-in or external flow meter. These parameters reflect key information such as the operating load, energy efficiency, and delivery capacity of each pump.

[0058] S14. For each pump that is turned on, adjust the pump speed according to the actual water flow rate, output power and corresponding standard water flow rate, and / or adjust the pump speed according to the actual water flow rate, pressure difference and corresponding standard water flow rate.

[0059] In this embodiment, multiple pumps operate in parallel. Some pumps may have excessively high speeds and high power consumption with low output, while others may have low operating efficiency, preventing the overall system efficiency from reaching its optimal level. Therefore, each pump needs independent adjustment and control to bring its operating point as close as possible to the design condition (standard outlet flow rate). The first adjustment method is to adjust the pump speed based on the actual outlet flow rate, output power, and standard outlet flow rate to optimize energy consumption efficiency (energy consumption per unit flow rate). Specifically, if the actual outlet flow rate of a pump is significantly lower than the standard outlet flow rate corresponding to the current output power, the system determines that the pump is in a high-energy-consumption, low-efficiency state and appropriately reduces its speed to reduce ineffective energy consumption. If the actual outlet flow rate of the pump is close to or higher than the standard outlet flow rate, it indicates that the operating power is within a reasonable range, and the current speed is maintained or fine-tuned to maintain efficient operation.

[0060] Optionally, the pump speed can be dynamically adjusted so that the current output power changes with the speed. The difference between the actual water flow rate after the speed change and the standard water flow rate corresponding to the current output power can be monitored in real time. When the difference is minimized, the current speed can be maintained.

[0061] The second adjustment method is to adjust the speed according to the actual water flow rate, pressure difference, and standard water flow rate. When the actual water flow rate of a water pump is significantly lower than the standard water flow rate corresponding to the pressure difference, it indicates that the water pump may be overloaded. The system will reduce its operating load by reducing the speed. If the actual water flow rate of the water pump is close to or higher than the standard water flow rate, the system will appropriately increase the speed.

[0062] Optionally, the pump speed can be dynamically adjusted so that the current pressure difference changes with the speed. The difference between the actual outflow rate after the speed change and the standard outflow rate corresponding to the current pressure difference can be monitored in real time. When the difference is minimized, the current speed can be maintained.

[0063] The above methods enable precise control of each pump, ensuring that its operating condition is as close as possible to the design conditions, thereby improving overall energy efficiency, reducing energy consumption, and extending the service life of the equipment.

[0064] The variable frequency pump group control method provided in this invention involves controlling the first pump in the variable frequency pump group to start, and when the operating state meets preset conditions, obtaining the total outflow rate of the variable frequency pump group; adjusting the number and speed of the pumps started in the variable frequency pump group according to the total outflow rate; when the current total outflow rate of the variable frequency pump group is greater than or equal to the flow threshold, obtaining the output power, water pressure difference, and actual outflow rate of each pump; for each pump, adjusting the speed of the pump based on the actual outflow rate, output power, and corresponding standard outflow rate, and / or adjusting the speed of the pump based on the actual outflow rate, pressure difference, and corresponding standard outflow rate. Therefore, by real-time monitoring of the outflow rate, power, and pressure difference of each pump in the variable frequency pump group, and comparing and adjusting with the standard parameters set by the system, the start / stop status and operating speed of the pumps can be dynamically adjusted, thereby achieving a coordinated match between the number of pumps and energy efficiency, improving the accuracy and stability of system operation, reducing energy consumption, and reducing the risk of failure.

[0065] Figure 2 A flowchart illustrating another variable frequency pump group control method provided in an embodiment of the present invention is shown below. Figure 2 As shown, the method specifically includes:

[0066] S21. Control the first water pump of the variable frequency pump set to start and run according to the preset operating current and preset speed; when the running time reaches the first time, determine that the operating status meets the preset conditions; obtain the water flow rate of the first water pump as the total water flow rate.

[0067] In this embodiment, the first pump in the variable frequency pump set is first turned on and operates according to preset operating current and speed values ​​(e.g., 50% of the rated operating current and 50% of the rated speed) to ensure a controllable startup process within acceptable energy consumption limits. After the pump runs continuously for a set period, its operating status is evaluated to determine if it meets preset operating conditions, including stability, current fluctuation range, and output pressure. If these conditions are met, the first pump has entered a stable operating state. At this point, the system acquires the current water flow rate of the pump and uses it as the basis for subsequent control judgments and optimization adjustments of the total water flow rate of the variable frequency pump set. This method avoids data deviations caused by unstable flow rates at the start of pump startup, improving overall control accuracy and system response reliability.

[0068] S22. When the total outflow rate is less than the flow threshold, increase the speed of the first pump within the speed range of the first pump; when the speed of the first pump reaches the highest value of the speed range and the total outflow rate is less than the flow threshold, control the number of pumps to be turned on to increase by one, and adjust the speed of the newly added pump within the speed range until the total outflow rate of all pumps is greater than or equal to the flow threshold, and then end the adjustment.

[0069] In this embodiment, when the current total outflow rate is detected to be lower than the set flow rate threshold, the outflow capacity is first increased by adjusting the speed of the first pump that has been activated. During this process, the system gradually increases the speed of the first pump within its allowable speed range (usually the upper limit of which is below the maximum speed and the lower limit is below the minimum speed) to achieve precise control of the outflow rate.

[0070] If the first pump's speed has already reached the preset maximum speed but still cannot bring the total outflow to the threshold, the system will start another pump in the variable frequency pump set that is not yet running, acting as a second pump. This second pump will also operate according to preset operating current and speed values ​​(e.g., 50% of the rated operating current and 50% of the rated speed). The system will then adjust the speed of this new pump within its adjustable speed range to work in conjunction with the existing pumps to improve the overall outflow capacity. This process can be continuously iterated based on actual flow changes, constantly determining whether the total outflow of all currently running pumps has reached or exceeded the set threshold. If not, the system will continue to start new pumps and adjust their speeds until the total outflow reaches or exceeds the threshold, thereby achieving dynamic expansion and precise control of the variable frequency pump set's outflow capacity.

[0071] The speed adjustment range of each water pump can be set. For example, the speed will not increase when it reaches 110% (rated speed + 10%), and will not decrease when it is 75% or below. The timer will start when the speed exceeds 100%, and the running time shall not exceed 1 minute. If it exceeds 1 minute, the pump will be automatically marked as abnormal and the pump speed will be forcibly reduced to below 100% before the abnormal state is lifted.

[0072] S23. When the current total outflow of the variable frequency pump set is greater than or equal to the flow threshold, for each pump in operation, obtain the voltage, current, inlet pressure, outlet pressure and actual outflow of the outlet; calculate the output power of each pump in operation based on the voltage and current; calculate the pressure difference of each pump in operation based on the outlet pressure and inlet pressure.

[0073] In this embodiment, when the current total outflow rate of the variable frequency pump set reaches or exceeds the set flow threshold, the performance of each pump currently in operation will be evaluated. Specifically, this includes: sequentially acquiring key operating parameters of each pump during operation, including: power supply voltage, current value, real-time inlet pressure, real-time outlet pressure, and actual outflow rate at the outlet. Based on the voltage and current values ​​of each pump, the output power generated by the pump during operation is calculated, reflecting its energy consumption level and workload. Simultaneously, the system compares the outlet pressure with the inlet pressure of the pump to calculate the pressure difference during operation, reflecting the driving efficiency and flow resistance of the water flow within the pump.

[0074] S24. Obtain the standard outlet flow rate corresponding to the output power from the power and outlet flow rate correspondence, and / or obtain the standard outlet flow rate corresponding to the pressure difference from the pressure difference and outlet flow rate correspondence; when the difference between the actual outlet flow rate and the standard outlet flow rate is greater than the preset difference, adjust the speed of the pump to make each difference less than or equal to the preset difference.

[0075] In this embodiment, the pump set is manufactured by importing a curve graph based on the relationship between the outlet flow rate, pressure difference, and output power at different pump speeds. At the same time, a variable frequency pump set operation status monitoring model is established. The curve graph can represent the correspondence between the output power and its standard operating outlet flow rate, as well as the correspondence between the pressure difference and its standard operating outlet flow rate. These can be dynamically queried based on the operation status monitoring model.

[0076] Based on the correlation between the pump's output power and its standard operating flow rate, the standard flow rate corresponding to that output power is determined. Optionally, the system can further determine the standard flow rate corresponding to that pressure difference based on the correlation between the pump's pressure difference and the standard flow rate.

[0077] When the difference between the actual outlet flow rate and the standard outlet flow rate determined by power or pressure difference exceeds a preset difference, it indicates that the current operating efficiency of the water pump deviates from its normal operating state. The speed of the water pump will be adjusted so that the actual outlet flow rate gradually approaches or reaches its expected standard outlet flow rate. This adjustment process continues until the difference between the actual outlet flow rate and the corresponding standard outlet flow rate of each water pump is within the preset allowable range, thereby ensuring the stability and efficiency of the overall pump set operation.

[0078] As an example, when a single pump is running, the actual outflow rate Q1 should equal the standard outflow rate Q demand. When two pumps are running, the actual outflow rate Q1 + Q2 should equal Q demand. When a single pump is running, if Q1 < Q demand, the pump speed is increased by the specified gear; if Q1 > Q demand, the pump speed is decreased by the specified gear. The Q1 value is checked at regular intervals until (Q1 - Q demand) / Q demand < 5%, at which point the deviation is considered acceptable, and the current gear is maintained. For multi-pump operation, taking a dual-pump setup as an example: when Q1 + Q2 < Q demand, both pumps simultaneously increase their speed by the specified gear until Q1 + Q2 ≥ Q demand. If Q1 or Q2 ≠ 1 / 2 Q demand, the pump gear is dynamically adjusted. The gear is increased (or decreased) for each pump until the flow rates of both pumps are close to and slightly greater than half of the required total flow rate. At this point, the gear adjustment stops, and the current gear is maintained. (For control methods when more pumps are running, refer to dual-pump operation).

[0079] S25. If the number of times any water pump is adjusted is greater than the preset number, and the difference is still greater than the preset difference, obtain the vibration parameters and / or noise parameters of the water pump; determine whether the currently activated water pump has malfunctioned based on the vibration parameters and / or noise parameters.

[0080] In this embodiment, if the difference between the actual outflow rate and the standard outflow rate of any activated water pump still does not reach the preset error allowable range after multiple speed adjustments (i.e., the difference is still greater than the preset difference), and the number of adjustments has exceeded the set upper limit, the system considers the water pump to be potentially malfunctioning. At this point, the system further acquires the pump's vibration and / or noise parameters, such as vibration intensity, frequency distribution, or noise level during operation. Then, the system judges the current operating status of the water pump based on preset vibration and noise thresholds. If the vibration or noise parameters are abnormal and exceed the normal operating range, the system can determine that the water pump has a potential fault or performance degradation problem, thus providing a basis for subsequent alarm prompts, shutdown protection, or maintenance suggestions.

[0081] As an example, vibration sensors are installed on each water pump bearing housing using threaded fixing or magnetic mounting. A vibration analyzer is then used, with the sampling time and sampling rate set. When the set threshold for abnormal vibration is reached, the analyzer automatically triggers the determination of a current fault.

[0082] A low-noise microphone was used as the sampling device and fixed to the housing at the outlet of each water pump. The frequency distribution data of the noise was viewed using the open-source data acquisition software Audacity, and then the curve of the noise frequency changing over time was plotted. Abnormal fluctuations were automatically identified by using the pre-set noise threshold.

[0083] S26. When it is determined that the start-up pump has malfunctioned, control the start-up pump to stop running, and re-execute the steps of adjusting the number and speed of the start-up pumps of the variable frequency pump set according to the total outflow rate; when the number of start-up pumps reaches the maximum value, and the current total outflow rate is still less than the flow threshold, control the speed of each start-up pump to reach the maximum value.

[0084] In this embodiment, when the system determines that a certain pump has malfunctioned based on vibration and / or noise parameters, it immediately stops the pump to prevent the fault from escalating or affecting the stability of the overall water supply system. The system then re-executes the adjustment steps for the total outflow of the current variable frequency pump set, adjusting the number of pumps in operation and the speed of each pump to compensate for the flow rate drop caused by the pump shutdown. This adjustment process prioritizes selecting pumps that are not currently in operation and adjusting them within their allowable speed range to ensure that the total outflow of the system reaches or exceeds the set flow threshold as quickly as possible.

[0085] If all available water pumps have been turned on, reaching the maximum number allowed to be turned on by the pump set, and the current total outflow is still less than the flow threshold, then the speed of all the turned-on water pumps will be increased until they reach their respective maximum operating speed, so as to maximize the outflow capacity and meet the flow requirements.

[0086] This invention achieves precise and efficient flow regulation and intelligent fault handling by acquiring the operating status, output power, pressure difference, and outflow of each pump in the variable frequency pump set in real time, and dynamically adjusting the number and speed of the pumps in combination with preset thresholds. It also judges the risk of failure when the difference is abnormal, thereby improving the system's water supply stability, operating efficiency, and reliability.

[0087] In one possible implementation, within each evaluation cycle, the unit output energy consumption is calculated for all currently operating water pumps: first, the real-time output power of each water pump is calculated, which is obtained by multiplying the voltage and current; then, the total power of all operating water pumps is summed and divided by the current total output flow rate to obtain the unit output energy consumption.

[0088] The system internally or learns to form a target energy efficiency model to represent the expected unit energy consumption under the current load. If the actual unit energy consumption is detected to be consistently higher than the target standard (e.g., exceeding it by more than 10%), the current operating state is determined to be "low energy efficiency". At this time, the system enters an energy consumption optimization feedback loop, readjusting the pump configuration in the following ways: Configuration layer optimization: attempting to reduce the number of operating pumps and increase the individual load to a higher efficiency range; Control layer speed adjustment: fine-tuning the speed of the operating pumps within the speed range to find a higher energy efficiency point; Sequential trial and error method: trying different pump combinations within a controllable range to identify the more energy-efficient pump arrangement under the current operating conditions. The system records the unit energy consumption of each round of optimization and forms the optimal configuration reference through rolling average or exponential weighting, which can be quickly invoked for subsequent similar operating scenarios, thereby achieving "the more it runs, the more energy-efficient it becomes".

[0089] Figure 3 A flowchart illustrating another variable frequency pump set control method provided in this embodiment of the invention is shown below. Figure 3 As shown, the method specifically includes:

[0090] The pump set in the liquid cooling system consists of multiple variable frequency pumps, each equipped with a current sensor, pressure sensor, vibration sensor, and noise sensor for real-time monitoring of the pump's operating status. The pumps involved in this variable frequency pump set are high-speed, canned variable frequency pumps, with four operating modes: P1 (single pump start), P2 (multiple pump start), P3 (intelligent adjustment), P4 (maintain speed), and P5 (fault). Normally, the pumps are started at mode P1. The pump set is manufactured with curves showing the relationship between flow rate, pressure, and power at each speed, and a monitoring model for the variable frequency pump set's operating status is established. Startup mode P1 is the single pump start mode, with a starting current of 50% of the rated operating current and a speed of 50% of the rated speed. When pump number 1 is started, after 30 seconds at mode P1, the current water flow rate is collected to observe whether the flow rate meets the requirements. If the water flow rate is less than 50% of the rated water flow rate, the system switches to P2 mode, which automatically starts pump number 2 (pump number 3 and subsequent pumps are backups and will automatically start when needed). After switching to P2 mode for 30 seconds, the current water flow rate is collected again. If the requirement is met, the current mode is maintained; otherwise, the system switches to P3 intelligent adjustment mode, automatically adjusting the speed until the water flow rate meets the requirement.

[0091] Once the water flow rate reaches the required level, the operating voltage and current of each pump are collected, and the output power at the current speed is calculated. Based on the flow-power curve built into the variable frequency pump set operation status monitoring model, the standard outlet flow rate corresponding to the current power is obtained from the curve. This is compared with the actual outlet flow rate monitored by the flow meter to determine if it is within the allowable error range. Simultaneously, the inlet and outlet pressure difference for each operating pump is detected. The actual outlet flow rate is then compared with the pressure difference-flow curve built into the monitoring model to determine the standard outlet flow rate. It is then determined whether the standard and actual outlet flow rates meet the requirements within the allowable error range. If they do, the system switches to P4 to maintain the current speed; otherwise, it remains in P3 and adjusts according to the intelligent regulation logic.

[0092] If the error remains significant after multiple adjustments, further vibration and noise parameters are collected for fault diagnosis. If a fault is identified, immediately switch to P5, shut down the malfunctioning water pump, and simultaneously activate the backup water pump. When the collected vibration and noise parameters show a small error compared to normal values, switch back to P3 and perform intelligent adjustment again until the water flow, pressure, and power correspond to the parameter curves in the built-in monitoring model within the allowable error range. Then, end the intelligent adjustment and switch to P4, maintaining the same gear and speed to reduce high energy consumption caused by frequent adjustments.

[0093] In this embodiment, each pump's current sensor monitors the pump's operating current in real time, and the pressure sensor monitors the pump's inlet and outlet pressures. A vibration sensor collects vibration signals to detect the pump's motion state and determine if any abnormalities have occurred. A noise sensor collects the pump's noise signals and analyzes whether the noise is abnormal. These parameters are transmitted to the central controller for analysis, enabling real-time data monitoring. The central controller analyzes the collected data according to a preset logic algorithm. If the differential pressure and water flow rate of a pump do not match preset values, or if there are significant or prolonged abnormal fluctuations in temperature or pressure, the controller determines that the pump may be faulty. Once abnormalities are continuously detected, the controller immediately switches to the fault position according to the logic. At this time, the faulty pump with abnormal monitoring data is shut down, and the backup pump is activated to ensure the system continues to operate. Simultaneously, the controller collects and records information about the faulty pump for subsequent maintenance. The central controller optimizes the pump group's operating status through intelligent algorithms. After collecting the actual load data of the system, it dynamically adjusts the operating speed of each pump to prevent certain pumps from operating under high load for extended periods, thereby extending the overall lifespan of the pump group.

[0094] Figure 4 This is a schematic diagram of the structure of a variable frequency pump group control device provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the device specifically includes:

[0095] Control module 41 is used to control the first water pump in the variable frequency pump group to start, and when the operating status meets the preset conditions, to obtain the total outflow rate of the variable frequency pump group.

[0096] The first adjustment module 42 is used to adjust the number and speed of the pumps started by the variable frequency pump group according to the total outflow rate;

[0097] The acquisition module 43 is used to acquire the output power, water pressure difference, and actual water flow of each pump when the current total outflow of the variable frequency pump group is greater than or equal to the flow threshold.

[0098] The second adjustment module 44 is used to adjust the rotation speed of each of the activated water pumps according to the actual water flow rate, the output power and the corresponding standard water flow rate, and / or to adjust the rotation speed of the activated water pumps according to the actual water flow rate, the pressure difference and the corresponding standard water flow rate.

[0099] In one possible implementation, the control module is specifically used to control the first water pump of the variable frequency pump set to start and operate according to a preset operating current and a preset speed;

[0100] When the running time reaches the first duration, it is determined that the running state meets the preset conditions;

[0101] The flow rate of the first water pump is obtained as the total flow rate.

[0102] In one possible implementation, the first adjustment module is specifically used to increase the speed of the first water pump within the speed range of the first water pump when the total outflow rate is less than the flow threshold.

[0103] When the speed of the first water pump reaches the highest value of the speed range and the total outflow is less than the flow threshold, the number of water pumps to be turned on is increased by one, and the speed of the newly added water pump is adjusted within the speed range until the total outflow of all water pumps is greater than or equal to the flow threshold, at which point the adjustment ends.

[0104] In one possible implementation, the acquisition module is specifically used to acquire, for each activated water pump, the operating voltage, current, inlet pressure, outlet pressure, and the actual outlet flow rate.

[0105] Calculate the output power of each of the activated water pumps based on the voltage and the current;

[0106] The pressure difference of each activated water pump is calculated based on the outlet pressure and the inlet pressure.

[0107] In one possible implementation, the second adjustment module is specifically used to obtain the standard outlet flow rate corresponding to the output power from the power and outlet flow rate correspondence, and / or to obtain the standard outlet flow rate corresponding to the pressure difference from the pressure difference and outlet flow rate correspondence.

[0108] When the difference between the actual water flow rate and the standard water flow rate is greater than a preset difference, the speed of the pump is adjusted so that each difference is less than or equal to the preset difference.

[0109] In one possible implementation, the acquisition module is further configured to acquire the vibration parameters and / or noise parameters of the activated water pump if the number of adjustments to any activated water pump is greater than a preset number and the difference is still greater than a preset difference.

[0110] The judgment module 45 is used to determine whether the currently activated water pump is malfunctioning based on the vibration parameters and / or the noise parameters.

[0111] In one possible implementation, the control module is further configured to, when it is determined that the start-up pump has malfunctioned, control the start-up pump to stop running, and re-execute the step of adjusting the number and speed of the start-up pumps of the variable frequency pump group according to the total outflow rate;

[0112] When the number of activated water pumps reaches its maximum value, and the current total outflow rate is still less than the flow rate threshold, the rotation speed of each activated water pump is controlled to reach its maximum value.

[0113] The variable frequency pump control device provided in this embodiment can be as follows: Figure 4 The apparatus shown can perform, for example Figure 1-2 All steps of the method, thus achieving Figure 1-2 For details on the technical effects of the method shown, please refer to [link / reference]. Figure 1-2 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0114] Figure 5 This is a schematic diagram of the structure of a refrigeration device provided in an embodiment of the present invention. Figure 5 The illustrated cooling device 500 includes at least one processor 501, a memory 502, at least one network interface 504, and other user interfaces 503. The various components in the cooling device 500 are coupled together via a bus system 505. It is understood that the bus system 505 is used to implement communication between these components. In addition to a data bus, the bus system 505 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in… Figure 5 The general designated all buses as Bus System 505.

[0115] The user interface 503 may include a display, keyboard, or clicking device (e.g., mouse, trackball, touchpad, or touchscreen).

[0116] It is understood that the memory 502 in the embodiments of the present invention can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 502 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0117] In some implementations, memory 502 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 5021 and application program 5022.

[0118] The operating system 5021 includes various system programs, such as the framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 5022 includes various applications, such as a media player and a browser, used to implement various application functions. The program implementing the method of this embodiment can be included in the application program 5022.

[0119] In this embodiment of the invention, by calling the program or instructions stored in memory 502, specifically the program or instructions stored in application program 5022, processor 501 executes the method steps provided in each method embodiment, including, for example:

[0120] When the first water pump in the variable frequency pump set is turned on and the operating status meets the preset conditions, the total outflow rate of the variable frequency pump set is obtained.

[0121] The number and speed of the pumps activated by the variable frequency pump set are adjusted according to the total outflow rate.

[0122] If the current total outflow rate of the variable frequency pump set is greater than or equal to the flow rate threshold, then the output power, pressure difference of the water flow, and actual outflow rate of each pump that is turned on are obtained.

[0123] For each of the activated water pumps, the rotational speed of the activated water pump is adjusted according to the actual water flow rate, the output power, and the corresponding standard water flow rate, and / or, the rotational speed of the activated water pump is adjusted according to the actual water flow rate, the pressure difference, and the corresponding standard water flow rate.

[0124] In one possible implementation, the first water pump of the variable frequency pump set is controlled to start and operate according to a preset operating current and a preset speed.

[0125] When the running time reaches the first duration, it is determined that the running state meets the preset conditions;

[0126] The flow rate of the first water pump is obtained as the total flow rate.

[0127] In one possible implementation, when the total outflow rate is less than the flow threshold, the rotational speed of the first water pump is increased within the rotational speed range of the first water pump;

[0128] When the speed of the first water pump reaches the highest value of the speed range and the total outflow is less than the flow threshold, the number of water pumps to be turned on is increased by one, and the speed of the newly added water pump is adjusted within the speed range until the total outflow of all water pumps is greater than or equal to the flow threshold, at which point the adjustment ends.

[0129] In one possible implementation, for each pump that is turned on, the operating voltage, current, inlet pressure, outlet pressure, and actual outlet flow rate are obtained.

[0130] Calculate the output power of each of the activated water pumps based on the voltage and the current;

[0131] The pressure difference of each activated water pump is calculated based on the outlet pressure and the inlet pressure.

[0132] In one possible implementation, the standard outlet flow rate corresponding to the output power is obtained from the power-outflow-flow correspondence, and / or the standard outlet flow rate corresponding to the pressure difference is obtained from the pressure difference-outflow-flow correspondence.

[0133] When the difference between the actual water flow rate and the standard water flow rate is greater than a preset difference, the speed of the pump is adjusted so that each difference is less than or equal to the preset difference.

[0134] In one possible implementation, if the number of times any water pump is adjusted to start is greater than a preset number, and the difference is still greater than a preset difference, the vibration parameters and / or noise parameters of the water pump are obtained.

[0135] Determine whether the currently activated water pump is malfunctioning based on the vibration parameters and / or the noise parameters.

[0136] In one possible implementation, when it is determined that the start-up pump has malfunctioned, the start-up pump is controlled to stop running, and the step of adjusting the number and speed of the start-up pumps of the variable frequency pump group according to the total outflow rate is re-executed;

[0137] When the number of activated water pumps reaches its maximum value, and the current total outflow rate is still less than the flow rate threshold, the rotation speed of each activated water pump is controlled to reach its maximum value.

[0138] The methods disclosed in the above embodiments of the present invention can be applied to processor 501, or implemented by processor 501. Processor 501 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 501 or by instructions in the form of software. The processor 501 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 502. Processor 501 reads the information in memory 502 and, in conjunction with its hardware, completes the steps of the above method.

[0139] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0140] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0141] The refrigeration equipment provided in this embodiment can be as follows: Figure 5 The device shown can perform, for example Figure 1-2 All steps of the method, thus achieving Figure 1-2 For details on the technical effects of the method shown, please refer to [link / reference]. Figure 1-2 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0142] This invention also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; the memory may also include combinations of the above types of memory.

[0143] One or more programs in the storage medium can be executed by one or more processors to implement the variable frequency pump group control method described above, which is executed on the device side.

[0144] The processor is used to execute the variable frequency pump group control program stored in the memory to implement the following steps of the variable frequency pump group control method executed on the equipment side:

[0145] When the first water pump in the variable frequency pump set is turned on and the operating status meets the preset conditions, the total outflow rate of the variable frequency pump set is obtained.

[0146] The number and speed of the pumps activated by the variable frequency pump set are adjusted according to the total outflow rate.

[0147] If the current total outflow rate of the variable frequency pump set is greater than or equal to the flow rate threshold, then the output power, pressure difference of the water flow, and actual outflow rate of each pump that is turned on are obtained.

[0148] For each of the activated water pumps, the rotational speed of the activated water pump is adjusted according to the actual water flow rate, the output power, and the corresponding standard water flow rate, and / or, the rotational speed of the activated water pump is adjusted according to the actual water flow rate, the pressure difference, and the corresponding standard water flow rate.

[0149] In one possible implementation, the first water pump of the variable frequency pump set is controlled to start and operate according to a preset operating current and a preset speed.

[0150] When the running time reaches the first duration, it is determined that the running state meets the preset conditions;

[0151] The flow rate of the first water pump is obtained as the total flow rate.

[0152] In one possible implementation, when the total outflow rate is less than the flow threshold, the rotational speed of the first water pump is increased within the rotational speed range of the first water pump;

[0153] When the speed of the first water pump reaches the highest value of the speed range and the total outflow is less than the flow threshold, the number of water pumps to be turned on is increased by one, and the speed of the newly added water pump is adjusted within the speed range until the total outflow of all water pumps is greater than or equal to the flow threshold, at which point the adjustment ends.

[0154] In one possible implementation, for each pump that is turned on, the operating voltage, current, inlet pressure, outlet pressure, and actual outlet flow rate are obtained.

[0155] Calculate the output power of each of the activated water pumps based on the voltage and the current;

[0156] The pressure difference of each activated water pump is calculated based on the outlet pressure and the inlet pressure.

[0157] In one possible implementation, the standard outlet flow rate corresponding to the output power is obtained from the power-outflow-flow correspondence, and / or the standard outlet flow rate corresponding to the pressure difference is obtained from the pressure difference-outflow-flow correspondence.

[0158] When the difference between the actual water flow rate and the standard water flow rate is greater than a preset difference, the speed of the pump is adjusted so that each difference is less than or equal to the preset difference.

[0159] In one possible implementation, if the number of times any water pump is adjusted to start is greater than a preset number, and the difference is still greater than a preset difference, the vibration parameters and / or noise parameters of the water pump are obtained.

[0160] Determine whether the currently activated water pump is malfunctioning based on the vibration parameters and / or the noise parameters.

[0161] In one possible implementation, when it is determined that the start-up pump has malfunctioned, the start-up pump is controlled to stop running, and the step of adjusting the number and speed of the start-up pumps of the variable frequency pump group according to the total outflow rate is re-executed;

[0162] When the number of activated water pumps reaches its maximum value, and the current total outflow rate is still less than the flow rate threshold, the rotation speed of each activated water pump is controlled to reach its maximum value.

[0163] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0164] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0165] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling a variable frequency pump set, wherein the variable frequency pump set comprises multiple water pumps, characterized in that, The method includes: When the first water pump in the variable frequency pump set is turned on and the operating status meets the preset conditions, the total outflow rate of the variable frequency pump set is obtained. The number and speed of the pumps activated by the variable frequency pump set are adjusted according to the total outflow rate. If the current total outflow rate of the variable frequency pump set is greater than or equal to the flow rate threshold, then the output power, pressure difference of the water flow, and actual outflow rate of each pump that is turned on are obtained. For each of the activated water pumps, the rotational speed of the activated water pump is adjusted according to the actual water flow rate, the output power, and the corresponding standard water flow rate, and / or, the rotational speed of the activated water pump is adjusted according to the actual water flow rate, the pressure difference, and the corresponding standard water flow rate.

2. The method according to claim 1, characterized in that, The step of controlling the first water pump in the variable frequency pump set to start and ensuring that the operating status meets preset conditions, and obtaining the total outflow rate of the variable frequency pump set, includes: The first water pump of the variable frequency pump set is controlled to start and run according to the preset operating current and preset speed. When the running time reaches the first duration, it is determined that the running state meets the preset conditions; The flow rate of the first water pump is obtained as the total flow rate.

3. The method according to claim 1, characterized in that, The step of adjusting the number and speed of the pumps started in the variable frequency pump set according to the total outflow includes: When the total outflow rate is less than the flow threshold, the speed of the first water pump is increased within the speed range of the first water pump; When the speed of the first water pump reaches the highest value of the speed range and the total outflow is less than the flow threshold, the number of water pumps to be turned on is increased by one, and the speed of the newly added water pump is adjusted within the speed range until the total outflow of all water pumps is greater than or equal to the flow threshold, at which point the adjustment ends.

4. The method according to claim 1, characterized in that, The acquisition of the output power, water pressure difference, and actual water flow rate of each activated water pump includes: For each water pump that is turned on, obtain the voltage, current, inlet pressure, outlet pressure, and actual outlet flow rate during operation; Calculate the output power of each of the activated water pumps based on the voltage and the current; The pressure difference of each activated water pump is calculated based on the outlet pressure and the inlet pressure.

5. The method according to claim 1, characterized in that, The step of adjusting the speed of the pump based on the actual outflow rate, the output power, and the corresponding standard outflow rate, and / or adjusting the speed of the pump based on the actual outflow rate, the pressure difference, and the corresponding standard outflow rate, includes: Obtain the standard outlet flow rate corresponding to the output power from the correspondence between power and outlet flow rate, and / or obtain the standard outlet flow rate corresponding to the pressure difference from the correspondence between pressure difference and outlet flow rate; When the difference between the actual water flow rate and the standard water flow rate is greater than a preset difference, the speed of the pump is adjusted so that each difference is less than or equal to the preset difference.

6. The method according to claim 5, characterized in that, The method further includes: If the number of times any water pump is turned on exceeds a preset number, and the difference is still greater than a preset difference, then the vibration parameters and / or noise parameters of the water pump are obtained. Determine whether the currently activated water pump is malfunctioning based on the vibration parameters and / or the noise parameters.

7. The method according to claim 6, characterized in that, The method further includes: When it is determined that the start-up water pump has malfunctioned, the start-up water pump is controlled to stop running, and the step of adjusting the number and speed of the start-up water pumps of the variable frequency pump group according to the total outflow rate is re-executed; When the number of activated water pumps reaches its maximum value, and the current total outflow rate is still less than the flow rate threshold, the rotation speed of each activated water pump is controlled to reach its maximum value.

8. A variable frequency pump set control device, wherein the variable frequency pump set comprises multiple water pumps, characterized in that, The device includes: The control module is used to control the first water pump in the variable frequency pump set to start, and when the operating status meets the preset conditions, to obtain the total water flow rate of the variable frequency pump set. The first adjustment module is used to adjust the number and speed of the pumps started by the variable frequency pump group according to the total outflow rate; The acquisition module is used to acquire the output power, water pressure difference, and actual water flow of each pump when the current total outflow of the variable frequency pump group is greater than or equal to the flow threshold. The second adjustment module is used to adjust the rotation speed of each of the activated water pumps according to the actual water flow rate, the output power and the corresponding standard water flow rate, and / or to adjust the rotation speed of the activated water pumps according to the actual water flow rate, the pressure difference and the corresponding standard water flow rate.

9. A refrigeration device, characterized in that, include: A processor and a memory, the processor being configured to execute a variable frequency pump group control program stored in the memory to implement the variable frequency pump group control method according to any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the variable frequency pump group control method according to any one of claims 1 to 7.

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