Intelligent speed regulation control method, device and equipment for immersed pump and storage medium

Abstract

The invention discloses an immersed pump intelligent speed regulation control method, device and equipment and a storage medium. Firstly, all the gas dispensers which are supplied with liquid by target immersed pumps and are in a running state can be identified to obtain a plurality of target gas dispensers, and the number and the state of the gas dispensers which are working at present are accurately mastered. And then the outlet pressure and flow parameters of each target gas dispenser are obtained in real time so as to reflect the liquid supply demand. And the specific working stage of each target gas filling machine is determined according to the data, so that staged accurate management is realized. And then the target output frequency of the immersed pump is calculated by integrating the working stage information of the multiple target gas filling machines, so that the running speed of the immersed pump is dynamically adjusted according to the frequency, and stable liquid supply and timely response are ensured. And finally, continuously and circularly executing the steps until all the gas filling machines stop running, so that intelligent cooperative control between the immersed pump and the gas filling machines is realized. The metering accuracy of the gas conveying amount of the immersed pump is improved, and meanwhile energy consumption and material cost are reduced.

Description

Technical Field

[0001] This application relates to the field of automation control technology, specifically to a method, device, equipment, and storage medium for intelligent speed control of a submersible pump. Background Technology

[0002] In the initial stage of filling a container or device with gas, a gas dispenser typically requires a high flow rate and pressure to meet the need for rapid filling. However, as the filling process progresses, the internal pressure of the container gradually increases, causing the required flow rate and pressure of the gas dispenser to continuously decrease, resulting in a situation where the flow parameters throughout the filling process exhibit continuous changes and instability.

[0003] Meanwhile, as the core device for liquid supply, the submersible pump needs to simultaneously meet the liquid supply demands of multiple gas dispensers. However, the flow rate and pressure requirements of each dispenser differ at any given moment, leading to significant fluctuations in the instantaneous flow rate output of the submersible pump. These instantaneous flow rate fluctuations not only make it difficult for the metering system to accurately measure the actual amount of gas delivered by the submersible pump, but also cause excessive or insufficient gas supply due to metering errors, resulting in raw material waste and increased energy consumption and material costs.

[0004] Therefore, how to reduce the instantaneous flow fluctuation when multiple gas dispensers are working simultaneously, so as to improve the metering accuracy of the gas delivered by the submersible pump and reduce the operating cost of the gas station, is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a method, apparatus, equipment, and storage medium for intelligent speed control of submersible pumps. This method can achieve intelligent speed control of submersible pumps in situations where the flow rate and pressure of multiple gas dispensers are constantly changing and fluctuating significantly. This improves the accuracy of gas measurement by the submersible pump and reduces the operating costs of gas stations.

[0006] The embodiments of this application disclose the following technical solutions:

[0007] A method for intelligent speed control of a submersible pump, the method comprising:

[0008] Identify all gas dispensers that are supplied with liquid by the target submersible pump and are currently in operation, thus obtaining multiple target gas dispensers;

[0009] Obtain the outlet pressure and outlet flow rate of each of the target gas dispensers;

[0010] For each target gas dispenser, the current operating stage of the target gas dispenser is determined based on the outlet pressure and outlet flow rate of the target gas dispenser.

[0011] Based on the current operating stage of each of the multiple target gas dispensers, the target output frequency is determined;

[0012] The operating speed of the target submersible pump is adjusted based on the target output frequency;

[0013] Repeat all the above steps until no gas dispenser is in the described working state, then stop.

[0014] In one possible implementation, the current working phase includes a startup phase, a stable refueling phase, or a phase that is about to end.

[0015] For each target gas dispenser, determining the current operating stage of the target gas dispenser based on its outlet pressure and outlet flow rate includes:

[0016] For each target refueling unit, if the outlet pressure is less than a first pressure threshold and the outlet flow rate is between a first flow rate threshold and a second flow rate threshold, then the target refueling unit is determined to be in the startup phase; if the outlet pressure is between the first and second pressure thresholds and the outlet flow rate is between the second and third flow rate thresholds, then the target refueling unit is determined to be in the stable refueling phase; if the outlet pressure is between the second and third pressure thresholds and the outlet flow rate is less than the third flow rate threshold, then the target refueling unit is determined to be in the near-ending phase.

[0017] Wherein, the first flow threshold is greater than the second flow threshold, and the second flow threshold is greater than the third flow threshold; the first pressure threshold is less than the second pressure threshold, and the second pressure threshold is less than the third pressure threshold.

[0018] In one possible implementation, after adjusting the operating speed of the target submersible pump based on the target output frequency, the method further includes:

[0019] The operating current, pump outlet pressure, and pump inlet pressure of the target submersible pump are collected, and the difference between the pump outlet pressure and the pump inlet pressure is calculated to obtain the pump pressure difference.

[0020] If the pump differential pressure is between the first differential pressure threshold and the second differential pressure threshold, and the operating current is between the first current threshold and the second current threshold, then the target submersible pump is determined to be in normal working condition.

[0021] If the pump differential pressure is less than the first differential pressure threshold and the operating current is greater than the second current threshold, then the target submersible pump is determined to be in an overcurrent state.

[0022] If the pump differential pressure is less than the first differential pressure threshold and the operating current is between the first current threshold and the second current threshold, then the target submersible pump is determined to be in an idling state.

[0023] Specifically, when the target submersible pump is in the overflow state or the idling state, the target submersible pump is controlled to stop working; the first differential pressure threshold is less than the second differential pressure threshold, and the first current threshold is less than the second current threshold.

[0024] In one possible implementation, both the first differential pressure threshold and the second differential pressure threshold are set based on the rated head of the target submersible pump; both the first current threshold and the second current threshold are set based on the rated current of the target submersible pump.

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

[0026] The total number of gas dispensers is obtained by counting all the gas dispensers that supply liquid through the target submersible pump, and the preset working stages are determined; the preset working stages include the start-up stage, the stable dispensing stage, and the near-end stage;

[0027] By combining the total number of gas dispensers and the preset working stages, a variety of combinations of operating conditions for the gas dispensers can be obtained.

[0028] The various combinations of operating conditions are analyzed and calculated to obtain the preset output frequency corresponding to each of the various combinations of operating conditions.

[0029] By combining the various operating conditions and associating them with their respective preset output frequencies, an operating state-frequency mapping table is obtained;

[0030] In the process of exhaustively searching for combinations, if there are duplicate combinations, the duplicate combinations will be removed.

[0031] In one possible implementation, determining the target output frequency based on the current operating stage of each of the plurality of target gas dispensers includes:

[0032] Combine all the current working stages to obtain the current working state combination;

[0033] The target combination is obtained by querying the operating status-frequency mapping table to find the operating status combination that matches the current operating status combination.

[0034] The preset output frequency that has a mapping relationship with the target combination is queried in the operation state-frequency mapping table, and the preset output frequency is determined as the target output frequency of the current operation state combination.

[0035] A smart speed control device for a submersible pump, the device comprising:

[0036] The identification unit is used to identify all gas dispensers that are supplied with liquid by the target submersible pump and are currently in operation, thereby obtaining multiple target gas dispensers;

[0037] The acquisition unit is used to acquire the outlet pressure and outlet flow rate of each of the target gas dispensers;

[0038] The first determining unit is used to determine the current operating stage of each target gas dispenser based on the outlet pressure and outlet flow rate of the target gas dispenser.

[0039] The second determining unit is used to determine the target output frequency based on the current operating stage of each of the plurality of target gas dispensers;

[0040] An adjustment unit is used to adjust the operating speed of the target submersible pump based on the target output frequency;

[0041] The execution unit is used to repeatedly execute all the above steps until no gas dispenser is in the working state, at which point it stops.

[0042] In one possible implementation, the current working phase includes a startup phase, a stable refueling phase, or a phase that is about to end.

[0043] The first determining unit is specifically used for:

[0044] For each target refueling unit, if the outlet pressure is less than a first pressure threshold and the outlet flow rate is between a first flow rate threshold and a second flow rate threshold, then the target refueling unit is determined to be in the startup phase; if the outlet pressure is between the first and second pressure thresholds and the outlet flow rate is between the second and third flow rate thresholds, then the target refueling unit is determined to be in the stable refueling phase; if the outlet pressure is between the second and third pressure thresholds and the outlet flow rate is less than the third flow rate threshold, then the target refueling unit is determined to be in the near-ending phase.

[0045] Wherein, the first flow threshold is greater than the second flow threshold, and the second flow threshold is greater than the third flow threshold; the first pressure threshold is less than the second pressure threshold, and the second pressure threshold is less than the third pressure threshold.

[0046] A submersible pump intelligent speed control device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the submersible pump intelligent speed control method as described above.

[0047] A computer-readable storage medium storing instructions that, when executed on a terminal device, cause the terminal device to perform the intelligent speed control method for a submersible pump as described above.

[0048] Compared with the prior art, this application has the following beneficial effects:

[0049] This application provides a method, apparatus, device, and storage medium for intelligent speed control of submersible pumps. Specifically, when executing the intelligent speed control method for submersible pumps provided in this application, firstly, multiple target gas dispensers are identified, all of which are supplied by the target submersible pump and are currently in operation. This ensures a comprehensive understanding of the number and status of active devices in the system, providing an accurate basis for subsequent regulation. Next, the outlet pressure and flow rate of each target gas dispenser are acquired, reflecting its supply demand and workload in real time. Then, the current operating stage of each gas dispenser is determined based on these parameters, achieving precise differentiation of different operating stages and avoiding blind, uniform control. Subsequently, by integrating the operating stage information of multiple gas dispensers, the target output frequency of the submersible pump is determined to balance the overall supply demand. Then, the operating speed of the submersible pump is dynamically adjusted according to this frequency, effectively reducing flow fluctuations and improving system stability and metering accuracy. Finally, the above steps are repeated until all gas dispensers stop operating, achieving closed-loop intelligent regulation and ensuring the high efficiency and stability of the entire refueling process.

[0050] This application, through precise identification of the current operating stage of each gas dispenser, can accurately grasp the actual needs of each dispenser at different refueling stages, and thus rationally set the target output frequency of the submersible pump. Based on this frequency, targeted adjustment of the submersible pump's operating speed is achieved, effectively avoiding the large flow fluctuations caused by previous single or blind control strategies. Through this dynamic, staged control method, the liquid supply needs of each gas dispenser are rationally coordinated, not only reducing the common excess and deficiency phenomena in the gas supply process, but also significantly improving the overall stability and efficiency of liquid supply. This not only reduces energy consumption and material waste caused by unstable operation of the gas station, but also improves the metering accuracy of the gas delivered by the submersible pump, thereby effectively improving the operational efficiency and economy of the gas station. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings used in the description of the embodiment or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1A flowchart of a method for intelligent speed control of a submersible pump provided in this application embodiment;

[0053] Figure 2 A flowchart illustrating a method for identifying the operating status of a submersible pump, as provided in this application embodiment;

[0054] Figure 3 A flowchart illustrating a method for determining a running state-frequency mapping relationship, provided in an embodiment of this application;

[0055] Figure 4 A flowchart illustrating a method for determining a target output frequency provided in an embodiment of this application;

[0056] Figure 5 This is a schematic diagram of the structure of an intelligent speed control device for a submersible pump provided in an embodiment of this application. Detailed Implementation

[0057] To facilitate understanding of the technical solutions provided in the embodiments of this application, the background technology involved in the embodiments of this application will be described below.

[0058] When a gas dispenser begins filling a container or device with gas, the flow rate and pressure are high. As the filling process progresses, these parameters gradually decrease, causing the required flow rate of the dispenser to fluctuate continuously and unpredictably. Since submersible pumps need to supply liquid to multiple dispensers simultaneously, and each dispenser has different requirements for flow rate and pressure at any given moment, the instantaneous flow rate output by the submersible pump fluctuates significantly. This flow rate fluctuation not only affects the accuracy of the metering system in determining the actual amount of gas delivered by the submersible pump, but also leads to oversupply or undersupply of gas due to metering errors, resulting in raw material waste and ultimately increasing energy consumption and material costs.

[0059] To address this issue, this application provides an intelligent speed control method, apparatus, device, and storage medium for submersible pumps. First, all gas dispensers supplied by the target submersible pump and currently in operation are identified, resulting in multiple target gas dispensers. Then, the outlet pressure and flow rate of each target gas dispenser are acquired. Next, for each target gas dispenser, the current operating stage is determined based on its outlet pressure and flow rate. Then, a target output frequency is determined based on the current operating stage of each of the multiple target gas dispensers, and the operating speed of the target submersible pump is adjusted accordingly. All the above steps are repeated until no gas dispenser is in operation, at which point the process stops. This application, by rationally determining the target output frequency based on the specific operating stage of each gas dispenser and adjusting the operating speed of the submersible pump accordingly, avoids blind or single-standard adjustments, thereby significantly reducing flow fluctuations, improving the metering accuracy of the gas delivered by the submersible pump, reducing oversupply and undersupply, and avoiding resource waste.

[0060] 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 this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0061] See Figure 1 The figure is a flowchart of a method for intelligent speed control of a submersible pump provided in an embodiment of this application. Figure 1 As shown, the intelligent speed control method for the submersible pump may include steps S101-S106:

[0062] S101: Identify all gas dispensers that are supplied with liquid by the target submersible pump and are currently in operation, and obtain multiple target gas dispensers.

[0063] To achieve precise management of intelligent speed control for submersible pumps, the first step is to identify all gas dispensers currently operating and supplied with liquid by the target submersible pump, thus obtaining information on multiple target gas dispensers. Specifically, this step involves real-time monitoring of the operating status and connections of each gas dispenser in the system to determine which dispensers are actively operating and connected to a specific submersible pump, responsible for receiving liquid from that pump. For example, in a large gas station, multiple gas dispensers may operate simultaneously, each catering to different vehicle refueling needs. By identifying these dispensers using submersible pumps, the system can accurately grasp the current load distribution, avoiding speed imbalances or resource waste due to misjudgments.

[0064] For example, suppose there are three gas dispensers A, B, and C at a certain moment, where A and B are in operation and supplied with liquid by the same submersible pump, while C is temporarily out of service. The identification step will screen out gas dispensers A and B as target objects, laying the foundation for subsequent acquisition of pressure and flow data and adjustment of the submersible pump frequency.

[0065] In this way, the system can dynamically respond to changes in gas demand at different times, achieve refined management of submersible pump operation, and improve the efficiency and stability of the overall refueling process.

[0066] S102: Obtain the outlet pressure and outlet flow rate of each of the target gas dispensers.

[0067] To accurately grasp the operating status and liquid supply requirements of each target gas dispenser, the system can acquire two key parameters: outlet pressure and outlet flow rate. Outlet pressure reflects the current delivery pressure level of the dispenser, directly affecting the stability and safety of the gas supply; while outlet flow rate indicates the actual amount of gas passing through the dispenser, serving as an important basis for evaluating dispensing efficiency and adjusting pump speed. For example, in a gas station, assuming target dispenser A has an outlet pressure of 0.8 MPa and a flow rate of 50 Nm³ / h, while target dispenser B has a pressure of 0.6 MPa and a flow rate of 30 Nm³ / h, these data help the system determine the workload of the two dispensers and their different demands on the submersible pumps. By continuously collecting and analyzing this pressure and flow rate data, the system can adjust the output of the submersible pumps in a timely manner, ensuring that each dispenser receives a sufficient and stable gas supply, avoiding uneven dispensing or equipment malfunctions due to insufficient pressure or flow fluctuations, and improving the overall operating efficiency and safety of the gas station.

[0068] S103: For each of the target gas dispensers, determine the current operating stage of the target gas dispenser based on the outlet pressure and outlet flow rate of the target gas dispenser.

[0069] To achieve precise speed control of the submersible pump, the system needs to determine the specific operating stage of each target refueling machine by combining its outlet pressure and flow data. Different combinations of pressure and flow reflect different states of the refueling machine during the refueling process, such as the start-up stage, the stable refueling stage, and the stage nearing the end.

[0070] S104: Determine the target output frequency based on the current operating stage of each of the multiple target gas dispensers.

[0071] Based on the current operating stage of each of the multiple target gas dispensers, the system can quickly and accurately determine the target output frequency of the submersible pump. Specifically, for different combinations of operating stages, corresponding output frequency parameters are preset. These parameters are the optimal operating frequencies calculated from experiments or historical data, which can meet the liquid supply and pressure requirements of each stage.

[0072] S105: Adjust the operating speed of the target submersible pump based on the target output frequency.

[0073] Based on a defined target output frequency, the system adjusts the operating speed of the submersible pump accordingly to achieve precise control of the liquid supply and pressure. Specifically, the motor drive of the submersible pump adjusts its speed according to the set frequency signal, thereby changing the pump's delivery capacity to match the actual liquid supply needs of the current gas dispenser. For example, when the target output frequency is high, the submersible pump increases its operating speed, increasing flow and pressure to meet the needs of multiple gas dispensers simultaneously starting up or operating at high load; conversely, when the output frequency decreases, the submersible pump slows down its speed to reduce energy consumption and avoid over-supply.

[0074] For example, suppose a gas station is in operation where all target gas dispensers have entered a stable dispensing phase. The system might adjust the target frequency to 60 Hz, at which point the submersible pump operates at a corresponding speed to ensure a continuous and stable liquid supply. Conversely, when all gas dispensers are nearing the end of their dispensing phase, the frequency might drop to 20 Hz or even lower, causing the submersible pump speed to decrease and achieve energy-saving operation. Through this dynamic frequency adjustment, the submersible pump can flexibly respond to different operating conditions, effectively improving the overall operating efficiency and economy of the gas station.

[0075] S106: Repeat steps S101-S105 until no gas dispenser is in the aforementioned working state, then stop.

[0076] To ensure the submersible pump can continuously and dynamically respond to the real-time demands of the gas dispensers, the system continuously executes steps S101 to S105 in a loop. This involves real-time identification of operating gas dispensers, collection of their outlet pressure and flow rate, determination of the operating stage, identification of the target output frequency, and adjustment of the submersible pump speed to achieve closed-loop intelligent control. With the start-up and shutdown of the gas dispensers and changes in load, this cyclical process ensures the submersible pump always operates in the state most suitable for the current working conditions, thereby guaranteeing accurate and stable liquid supply. When all gas dispensers stop operating or are no longer in a state requiring liquid supply, the system detects the absence of any active target gas dispensers, automatically terminates the cyclical operation, and stops speed control of the submersible pump. This avoids resource waste and excessive equipment operation, ensuring the safe and efficient operation of the system.

[0077] Based on the content of S101-S106, the process first identifies all gas dispensers supplied with liquid by the target submersible pump and currently in operation, thus determining multiple target gas dispensers. Next, the outlet pressure and outlet flow parameters of each target gas dispenser are obtained. Then, based on the outlet pressure and flow of each target gas dispenser, its current operating stage is determined. Following this, based on the operating stage information of each target gas dispenser, the target output frequency of the submersible pump is calculated and determined. Subsequently, the operating speed of the submersible pump is adjusted according to this output frequency. Finally, the above steps are repeated until all gas dispensers are no longer in operation. This application, through precise identification of the operating stage of each gas dispenser, scientifically determines the target output frequency of the submersible pump and makes targeted adjustments according to actual needs, effectively avoiding the flow fluctuation problem caused by single or blind control in traditional methods. This achieves reasonable coordination of the liquid supply needs of each gas dispenser, reduces excessive or insufficient gas supply, significantly reduces the energy consumption and material costs of the gas station, and improves the metering accuracy of the gas delivered by the submersible pump.

[0078] In one possible implementation, the system divides the operating status of the target gas dispenser into three main stages: startup, stable refueling, and near-completion. For each target gas dispenser, the system determines its current stage by collecting real-time pressure and flow data at its outlet and combining this with preset pressure and flow thresholds.

[0079] Specifically, when the outlet pressure of the gas dispenser is lower than the first pressure threshold and the outlet flow rate is between the first flow rate threshold and the second flow rate threshold, the system determines that the gas dispenser is in the startup phase. At this time, the equipment has just started working and the pressure and flow rate have not yet reached a stable state.

[0080] When the pressure is between the first and second pressure thresholds and the flow rate is between the second and third flow rate thresholds, it indicates that the gas dispenser has entered a stable dispensing phase. At this time, the liquid supply process remains stable, and the pressure and flow rate are maintained within a relatively constant range.

[0081] When the pressure is between the second and third pressure thresholds and the flow rate is lower than the third flow rate threshold, it indicates that the gas dispenser is about to finish its current refueling task and is in the final stage, with a significant reduction in the liquid supply.

[0082] It should be noted that, to ensure the scientific rigor and accuracy of the judgment, these thresholds are set to satisfy the following relationships: the first flow threshold is greater than the second flow threshold, the second flow threshold is greater than the third flow threshold, and the first pressure threshold is less than the second pressure threshold, and the second pressure threshold is less than the third pressure threshold. This forms a reasonable interval segmentation standard, ensuring that different working stages are effectively distinguished and responded to in a timely manner.

[0083] In one possible implementation, the first flow threshold can be set to, but is not limited to, 60, the second flow threshold can be set to, but is not limited to, 40, the third flow threshold can be set to, but is not limited to, 30, the first pressure threshold can be set to, but is not limited to, 1 MPa, the second pressure threshold can be set to, but is not limited to, 1.2 MPa, and the third pressure threshold can be set to, but is not limited to, 1.4 MPa.

[0084] In one possible implementation, this application also provides a method for identifying the operating state of a submersible pump, such as... Figure 2 As shown, Figure 2 A flowchart of a method for identifying the working status of a submersible pump provided in this application embodiment is shown, which can be specifically implemented through steps S201-S204:

[0085] S201: Collect the operating current, pump outlet pressure, and pump inlet pressure of the target submersible pump, and calculate the difference between the pump outlet pressure and the pump inlet pressure to obtain the pump pressure difference.

[0086] To accurately determine the operating status of the target submersible pump, the system first collects key operating parameters in real time, including the pump's operating current, outlet pressure, and inlet pressure. By comparing the outlet and inlet pressure values, the difference between them is calculated—the pump differential pressure. This parameter directly reflects the pump's actual delivery capacity and fluid delivery status. The magnitude of the pump differential pressure directly relates to the pump's load and whether it is operating normally. Therefore, this calculation step is fundamental for subsequent determinations of whether the submersible pump is experiencing overflow, idling, or other abnormal conditions, providing crucial data for intelligent control and protection.

[0087] Wherein, pump pressure difference = outlet pressure - pump inlet pressure.

[0088] S202: If the pump differential pressure is between the first differential pressure threshold and the second differential pressure threshold and the operating current is between the first current threshold and the second current threshold, then the target submersible pump is determined to be in normal working condition.

[0089] When the pump differential pressure falls between the preset first and second differential pressure thresholds, and the submersible pump's operating current also falls between the first and second current thresholds, it indicates that the submersible pump's pressure output and motor load are within reasonable ranges. At this point, the pump neither experiences a decrease in delivery efficiency due to excessively low pressure nor an abnormal increase in current, indicating that the pump's operation is stable and meets design requirements. Therefore, the system can use this criterion to confirm that the target submersible pump is currently in normal working condition, thereby ensuring a safe and reliable continuous liquid supply.

[0090] S203: If the pump differential pressure is less than the first differential pressure threshold and the operating current is greater than the second current threshold, then the target submersible pump is determined to be in an overcurrent state.

[0091] When the pump differential pressure falls below the first differential pressure threshold, it indicates a small pressure difference between the submersible pump's outlet and inlet, signifying a significant decrease in the pump's delivery capacity. This may be due to reduced fluid resistance or abnormal delivery load. Simultaneously, if the operating current exceeds the second current threshold, it indicates an excessive motor load and abnormally increased current consumption. This state of decreased pressure differential and increased current typically signifies that the pump is in an overflow condition, meaning the internal flow exceeds the design range, leading to increased mechanical load. Based on these assessments, the system identifies this state of the target submersible pump as an overflow condition. To prevent mechanical damage and energy waste, the system will control the submersible pump to stop operating in this state.

[0092] S204: If the pump pressure difference is less than the first pressure difference threshold and the operating current is between the first current threshold and the second current threshold, then the target submersible pump is determined to be in an idling state.

[0093] When the pump differential pressure is less than the first differential pressure threshold, it means that the pressure difference between the submersible pump outlet and inlet is low, indicating insufficient fluid pressure inside the pump, which may indicate abnormalities such as insufficient liquid or backflow. At this time, if the operating current is between the first and second current thresholds, it means that the motor load has not yet reached the overcurrent state, but the pump is still consuming a certain amount of current. Combining these two indicators, it can be determined that the submersible pump is in an idling state, meaning that there is a lack of effective fluid medium inside the pump body, causing the pump impeller to rotate at high speed but unable to deliver liquid normally. To avoid mechanical damage and energy waste, the system will control the submersible pump to stop operating in this state.

[0094] It should be noted that the first differential pressure threshold is less than the second differential pressure threshold, and the first current threshold is less than the second current threshold. The setting of these thresholds ensures a clear distinction between different operating states, making the diagnosis of the pump's condition more accurate and reliable.

[0095] In one possible implementation, both the first and second differential pressure thresholds are based on the rated head (i.e., rated pressure difference) of the target submersible pump, and are set by considering the small fluctuations caused by changes in operating conditions, liquid properties, and environmental factors under normal operating conditions. Similarly, the first and second current thresholds are also based on the rated current of the target submersible pump, and are set with appropriate upward and downward fluctuations to reflect the minute changes in current during actual operation. This threshold design based on rated parameters and their reasonable fluctuation range can more accurately define the operating state of the submersible pump, improving the reliability and accuracy of state identification.

[0096] It should be noted that rated head (rated pressure difference) indicates the head height or pressure increase that the pump can provide under rated operating conditions, reflecting the pump's pressure delivery capacity, and is equivalent to the difference between the outlet pressure and the inlet pressure.

[0097] In one possible implementation, this application also provides a method for formulating a runtime state-frequency mapping table, such as... Figure 3 As shown, Figure 3 A flowchart illustrating a method for determining a running state-frequency mapping relationship, provided in this application embodiment, can be implemented through steps S301-S304:

[0098] S301: Count the number of all gas dispensers that supply liquid through the target submersible pump to obtain the total number of gas dispensers, and determine the preset working stage.

[0099] To gain a comprehensive understanding of the target submersible pump's operating environment, the system first needs to count the number of gas dispensers supplying liquid through that pump, thus obtaining the total number of gas dispensers. Based on this quantity information, the system further determines the preset operating stages that each gas dispenser may be in. These stages typically include the startup stage, the stable dispensing stage, and the near-end stage. Specifically, the startup stage indicates that the gas dispenser has just begun operating and the equipment has not yet reached a steady state; the stable dispensing stage indicates that the gas dispenser is in a normal and continuous dispensing process; and the near-end stage indicates that the gas dispenser's task is nearing completion, and the output flow rate and pressure begin to decrease.

[0100] S302: Combine the total number of gas dispensers and the preset working stages to exhaustively enumerate the possible combinations of various operating conditions of the gas dispensers.

[0101] To comprehensively reflect the possible operating conditions of all gas dispensers under the target submersible pump, the system combines the total number of gas dispensers with their respective preset operating stages, generating various combinations of gas dispenser operating states through a combined exhaustive search method. This includes not only the case where all gas dispensers are simultaneously in a certain operating stage, but also the case where some gas dispensers are in operating stages while others are in standby or off states. This allows for a more realistic simulation of actual operating conditions, ensuring coverage of all possible operating configurations. During the exhaustive search process, due to potential duplications caused by functional equivalence or sequence differences between different combinations, the system automatically identifies and eliminates these duplicate combinations, ensuring the final result is unique and efficient.

[0102] It should be noted that during the actual exhaustive process, the system does not separately record the status of inactive gas dispensers (such as those in "standby" or "off" states). This part is ignored as part of the valid combination; only gas dispenser combinations that are actually in the starting, stable refueling, or about to finish operating phases are considered. This simplifies the model and better reflects actual operating conditions.

[0103] For example, suppose there are two gas dispensers. Each dispenser has preset operating phases including a "start-up phase," a "stable refueling phase," and a "soon-to-end phase." When not in operation, each dispenser is marked as "standby" or "off." These inactive states are considered empty during exhaustive searching and are not included in the combinations. Exhaustive combinations may include: (start-up phase), (stable refueling phase), (soon-to-end phase), (start-up phase, stable refueling phase), (start-up phase, soon-to-end phase), etc. If (start-up phase, stable refueling phase) and (stable refueling phase, start-up phase) are considered the same combination, the system removes duplicates and retains only one record. Through this method, the system can accurately and efficiently establish a gas dispenser operating state model, providing a solid foundation for subsequent analysis and control.

[0104] S303: Analyze and calculate the various combinations of operating conditions to obtain the preset output frequency corresponding to each of the various combinations of operating conditions.

[0105] For the various combinations of gas dispenser operating conditions obtained through exhaustive combination, the system needs to perform in-depth analysis and calculation for each combination to determine its corresponding preset output frequency. The preset output frequency represents the operating frequency that the submersible pump should reach under specific operating conditions, and is an important parameter to ensure that the pump can meet the current load requirements and operating conditions. During the analysis, the system considers factors such as the flow demand, pressure changes, and current consumption of each gas dispenser at different operating stages, comprehensively evaluates the load characteristics of the entire liquid supply system, and thus calculates a reasonable and stable frequency value.

[0106] For example, suppose a certain operating combination includes two gas dispensers, one in the startup phase and the other in the steady-state dispensing phase. The dispenser in the startup phase may require lower or gradually increasing flow rates, while the dispenser in the steady-state phase maintains a constant high flow rate. Based on the total flow rate required in these two phases and the corresponding pressure requirements, the system calculates a preset output frequency of 48Hz for the submersible pump in this combination. Alternatively, when both dispensers are nearing the end of their operation, the calculated preset output frequency may drop to 45Hz due to the reduced flow rate demand. By matching an appropriate preset frequency to each operating combination, the system can achieve dynamic adjustment, improving the efficiency and stability of the submersible pump operation.

[0107] S304: Combine the various operating conditions with their respective preset output frequencies to obtain an operating state-frequency mapping table.

[0108] To accurately identify and effectively control the operating status of the submersible pump, the system associates various combinations of refueling unit operating conditions with their corresponding preset output frequencies, constructing a complete operating status-frequency mapping table. This table details the ideal pump operating frequency for each refueling unit operating condition combination, serving as the basis for real-time monitoring and adjustment. By consulting this mapping table, the system can quickly determine the appropriate frequency for the current operating combination, thereby guiding the submersible pump to adjust its operating parameters and achieve dynamic optimization.

[0109] In one possible implementation, this application also provides a method for determining the target output frequency, such as... Figure 4 As shown, Figure 4 A flowchart of a method for determining a target output frequency provided in this application embodiment is shown, which can be implemented through steps S401-S403:

[0110] S401: Combine all the current working stages to obtain the current working state combination.

[0111] During actual operation, each gas dispenser may be in different working stages, such as the start-up stage, the stable dispensing stage, or the stage about to end. In order to accurately reflect the current operating condition of the entire liquid supply system, the system needs to combine the current working stages of all gas dispensers to form an overall current operating status combination.

[0112] For example, assuming the system detects that three gas dispensers are currently in the "start-up phase," "stable refueling phase," and "ending phase," respectively, these three phases are combined sequentially to obtain the current operating state combination as (start-up phase, stable refueling phase, ending phase). Through this combination, the system can comprehensively capture the overall operating status of multiple gas dispensers, laying the foundation for accurately calculating the target output frequency.

[0113] S402: Query the operating status combination that matches the current operating status combination in the operating status-frequency mapping table to obtain the target combination.

[0114] To determine the operating characteristics of the current gas dispenser group, the system uses existing combinations of current operating states as query criteria and searches a pre-established operating state-frequency mapping table. This mapping table records all possible combinations of operating conditions and their corresponding preset output frequencies. By finding an operating condition combination that perfectly matches the current operating state combination, the system can accurately identify the target combination. This step ensures that subsequent frequency settings are based on real and accurate operating states, improving the overall control accuracy and response speed.

[0115] For example, assuming the current operating state combination is (startup phase, stable refueling phase), the system will search the mapping table for an entry that perfectly matches this combination. If there is another operating state combination in the table that is also (startup phase, stable refueling phase), then that combination is identified as the target combination. By obtaining this target combination, the system can continue to search for its corresponding preset output frequency to achieve targeted frequency adjustment.

[0116] S403: Query the operating state-frequency mapping table for a preset output frequency that has a mapping relationship with the target combination, and determine the preset output frequency as the target output frequency of the current operating state combination.

[0117] After determining the target combination, the system further searches the operating state-frequency mapping table for the preset output frequency corresponding to that target combination. This preset output frequency is pre-calculated or set based on the optimal operating parameters of the submersible pump under a specific operating condition combination, and is used to guide the actual operation of the pump to meet the current load requirements. By assigning this frequency to the current operating state combination as its target output frequency, the system can achieve precise frequency control, thereby optimizing equipment performance and energy-saving effects.

[0118] For example, assuming the target combination is (start-up phase, stable filling phase), the mapping table records the preset output frequency corresponding to this combination as 48Hz. Then the system will determine 48Hz as the target output frequency for the current working state combination, and adjust the operating frequency of the submersible pump accordingly to ensure that the pump output can meet the flow and pressure requirements of the two gas dispensers when they are in different working phases, thereby achieving an efficient and stable liquid supply process.

[0119] See Figure 5 , Figure 5 This is a schematic diagram of a submersible pump intelligent speed control device provided in an embodiment of this application. Figure 5 As shown, the intelligent speed control device for the submersible pump includes:

[0120] The identification unit 501 is used to identify all gas dispensers that are supplied with liquid by the target submersible pump and are currently in operation, thereby obtaining multiple target gas dispensers;

[0121] Acquisition unit 502 is used to acquire the outlet pressure and outlet flow rate of each of the target gas dispensers;

[0122] The first determining unit 503 is used to determine the current operating stage of each target gas dispenser based on the outlet pressure and outlet flow rate of the target gas dispenser.

[0123] The second determining unit 504 is used to determine the target output frequency based on the current working stage of each of the plurality of target gas dispensers;

[0124] Adjustment unit 505 is used to adjust the operating speed of the target submersible pump based on the target output frequency;

[0125] The execution unit 506 is used to repeatedly execute all the above steps until no gas dispenser is in the working state, at which point it stops.

[0126] In one possible implementation, the current working phase includes a startup phase, a stable refueling phase, or a near-ending phase.

[0127] In one possible implementation, the first determining unit 503 is specifically used for:

[0128] For each target refueling unit, if the outlet pressure is less than a first pressure threshold and the outlet flow rate is between a first flow rate threshold and a second flow rate threshold, then the target refueling unit is determined to be in the startup phase; if the outlet pressure is between the first and second pressure thresholds and the outlet flow rate is between the second and third flow rate thresholds, then the target refueling unit is determined to be in the stable refueling phase; if the outlet pressure is between the second and third pressure thresholds and the outlet flow rate is less than the third flow rate threshold, then the target refueling unit is determined to be in the near-ending phase.

[0129] Wherein, the first flow threshold is greater than the second flow threshold, and the second flow threshold is greater than the third flow threshold; the first pressure threshold is less than the second pressure threshold, and the second pressure threshold is less than the third pressure threshold.

[0130] In one possible implementation, the device further includes:

[0131] The data acquisition unit is used to acquire the operating current, pump outlet pressure, and pump inlet pressure of the target submersible pump.

[0132] The calculation unit is used to calculate the difference between the pump outlet pressure and the pump inlet pressure to obtain the pump pressure difference;

[0133] The third determining unit is configured to determine that the target submersible pump is in normal working condition if the pump differential pressure is between a first differential pressure threshold and a second differential pressure threshold and the operating current is between a first current threshold and a second current threshold; determine that the target submersible pump is in overcurrent condition if the pump differential pressure is less than the first differential pressure threshold and the operating current is greater than the second current threshold; and determine that the target submersible pump is in idling condition if the pump differential pressure is less than the first differential pressure threshold and the operating current is between the first current threshold and the second current threshold.

[0134] Specifically, when the target submersible pump is in the overflow state or the idling state, the target submersible pump is controlled to stop working; the first differential pressure threshold is less than the second differential pressure threshold, and the first current threshold is less than the second current threshold.

[0135] In one possible implementation, both the first differential pressure threshold and the second differential pressure threshold are set based on the rated head of the target submersible pump; both the first current threshold and the second current threshold are set based on the rated current of the target submersible pump.

[0136] In one possible implementation, the device further includes:

[0137] The statistics unit is used to count the number of all gas dispensers that supply liquid through the target submersible pump to obtain the total number of gas dispensers;

[0138] The fourth determining unit is used to determine the preset working stages; the preset working stages include the start-up stage, the stable refueling stage, and the near-end stage;

[0139] The combined exhaustive search unit is used to perform combined exhaustive search by combining the total number of gas dispensers and the preset working stage to obtain multiple combinations of operating states of the gas dispensers;

[0140] The analysis and calculation unit is used to analyze and calculate the various combinations of operating conditions respectively, and obtain the preset output frequency corresponding to each of the various combinations of operating conditions.

[0141] The association unit is used to associate the various operating conditions with their respective preset output frequencies to obtain an operating state-frequency mapping table.

[0142] In the process of exhaustively searching for combinations, if there are duplicate combinations, the duplicate combinations will be removed.

[0143] In one possible implementation, the second determining unit 504 is specifically used for:

[0144] Combine all the current working stages to obtain the current working state combination;

[0145] The target combination is obtained by querying the operating status-frequency mapping table to find the operating status combination that matches the current operating status combination.

[0146] The preset output frequency that has a mapping relationship with the target combination is queried in the operation state-frequency mapping table, and the preset output frequency is determined as the target output frequency of the current operation state combination.

[0147] In addition, this application embodiment also provides a submersible pump intelligent speed control 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, it implements the submersible pump intelligent speed control method as described above.

[0148] In addition, this application embodiment also provides a computer-readable storage medium storing instructions that, when executed on a terminal device, cause the terminal device to perform the intelligent speed control method for a submersible pump as described above.

[0149] This application achieves targeted speed adjustment by accurately identifying the working stage of each gas dispenser and reasonably setting the target output frequency of the submersible pump. This avoids the flow fluctuations caused by traditional single or blind control, thereby effectively coordinating the liquid supply needs of each gas dispenser, reducing the phenomenon of gas supply surplus or shortage, and thus significantly reducing the energy consumption and material costs of the gas station, while also improving the metering accuracy of the gas delivered by the submersible pump.

[0150] The above provides a detailed description of the intelligent speed control method, apparatus, device, and storage medium for a submersible pump provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0151] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0152] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for intelligent speed control of a submersible pump, characterized in that, The method includes: Identify all gas dispensers that are supplied with liquid by the target submersible pump and are currently in operation, thus obtaining multiple target gas dispensers; Obtain the outlet pressure and outlet flow rate of each of the target gas dispensers; For each target gas dispenser, the current operating stage of the target gas dispenser is determined based on the outlet pressure and outlet flow rate of the target gas dispenser. Based on the current operating stage of each of the multiple target gas dispensers, the target output frequency is determined; The operating speed of the target submersible pump is adjusted based on the target output frequency; Repeat all the above steps until no gas dispenser is in the described working state, then stop.

2. The method according to claim 1, characterized in that, The current working phase includes the startup phase, the stable refueling phase, or the phase that is about to end. For each target gas dispenser, determining the current operating stage of the target gas dispenser based on its outlet pressure and outlet flow rate includes: For each target refueling unit, if the outlet pressure is less than a first pressure threshold and the outlet flow rate is between a first flow rate threshold and a second flow rate threshold, then the target refueling unit is determined to be in the startup phase; if the outlet pressure is between the first and second pressure thresholds and the outlet flow rate is between the second and third flow rate thresholds, then the target refueling unit is determined to be in the stable refueling phase; if the outlet pressure is between the second and third pressure thresholds and the outlet flow rate is less than the third flow rate threshold, then the target refueling unit is determined to be in the near-ending phase. Wherein, the first flow threshold is greater than the second flow threshold, and the second flow threshold is greater than the third flow threshold; the first pressure threshold is less than the second pressure threshold, and the second pressure threshold is less than the third pressure threshold.

3. The method according to claim 1, characterized in that, After adjusting the operating speed of the target submersible pump based on the target output frequency, the method further includes: The operating current, pump outlet pressure, and pump inlet pressure of the target submersible pump are collected, and the difference between the pump outlet pressure and the pump inlet pressure is calculated to obtain the pump pressure difference. If the pump differential pressure is between the first differential pressure threshold and the second differential pressure threshold, and the operating current is between the first current threshold and the second current threshold, then the target submersible pump is determined to be in normal working condition. If the pump differential pressure is less than the first differential pressure threshold and the operating current is greater than the second current threshold, then the target submersible pump is determined to be in an overcurrent state. If the pump differential pressure is less than the first differential pressure threshold and the operating current is between the first current threshold and the second current threshold, then the target submersible pump is determined to be in an idling state. Specifically, when the target submersible pump is in the overflow state or the idling state, the target submersible pump is controlled to stop working; the first differential pressure threshold is less than the second differential pressure threshold, and the first current threshold is less than the second current threshold.

4. The method according to claim 3, characterized in that, The first differential pressure threshold and the second differential pressure threshold are both set based on the rated head of the target submersible pump; the first current threshold and the second current threshold are both set based on the rated current of the target submersible pump.

5. The method according to claim 1, characterized in that, The method further includes: The total number of gas dispensers is obtained by counting all the gas dispensers that supply liquid through the target submersible pump, and the preset working stages are determined; the preset working stages include the start-up stage, the stable dispensing stage, and the near-end stage; By combining the total number of gas dispensers and the preset working stages, a variety of combinations of operating conditions for the gas dispensers can be obtained. The various combinations of operating conditions are analyzed and calculated to obtain the preset output frequency corresponding to each of the various combinations of operating conditions. By combining the various operating conditions and associating them with their respective preset output frequencies, an operating state-frequency mapping table is obtained; In the process of exhaustively searching for combinations, if there are duplicate combinations, the duplicate combinations will be removed.

6. The method according to claim 5, characterized in that, The determination of the target output frequency based on the current operating stage of each of the multiple target gas dispensers includes: Combine all the current working stages to obtain the current working state combination; The target combination is obtained by querying the operating status-frequency mapping table to find the operating status combination that matches the current operating status combination. The preset output frequency that has a mapping relationship with the target combination is queried in the operation state-frequency mapping table, and the preset output frequency is determined as the target output frequency of the current operation state combination.

7. A smart speed control device for a submersible pump, characterized in that, The device includes: The identification unit is used to identify all gas dispensers that are supplied with liquid by the target submersible pump and are currently in operation, thereby obtaining multiple target gas dispensers; The acquisition unit is used to acquire the outlet pressure and outlet flow rate of each of the target gas dispensers; The first determining unit is used to determine the current operating stage of each target gas dispenser based on the outlet pressure and outlet flow rate of the target gas dispenser. The second determining unit is used to determine the target output frequency based on the current operating stage of each of the plurality of target gas dispensers; An adjustment unit is used to adjust the operating speed of the target submersible pump based on the target output frequency; The execution unit is used to repeatedly execute all the above steps until no gas dispenser is in the working state, at which point it stops.

8. The apparatus according to claim 7, characterized in that, The current working phase includes the startup phase, the stable refueling phase, or the phase that is about to end. The first determining unit is specifically used for: For each target refueling unit, if the outlet pressure is less than a first pressure threshold and the outlet flow rate is between a first flow rate threshold and a second flow rate threshold, then the target refueling unit is determined to be in the startup phase; if the outlet pressure is between the first and second pressure thresholds and the outlet flow rate is between the second and third flow rate thresholds, then the target refueling unit is determined to be in the stable refueling phase; if the outlet pressure is between the second and third pressure thresholds and the outlet flow rate is less than the third flow rate threshold, then the target refueling unit is determined to be in the near-ending phase. Wherein, the first flow threshold is greater than the second flow threshold, and the second flow threshold is greater than the third flow threshold; the first pressure threshold is less than the second pressure threshold, and the second pressure threshold is less than the third pressure threshold.

9. A smart speed control device for a submersible pump, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the intelligent speed control method for a submersible pump as described in any one of claims 1-6.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on a terminal device, cause the terminal device to perform the intelligent speed control method for a submersible pump as described in any one of claims 1-6.

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