Energy-saving pump set and linkage control method for multiple energy-saving pumps

Abstract

The invention relates to an energy-saving pump set and a linkage control method for multiple energy-saving pumps, and relates to the technical field of energy-saving pumps. The energy-saving pumps are used for conveying media, the motors are arranged on the energy-saving pumps to drive the energy-saving pumps to work, and the communicating pipelines are fixedly connected with the energy-saving pumps to convey the media in the energy-saving pumps respectively. The conveying pipeline is fixedly connected with the communicating pipeline to connect all the energy-saving pumps in parallel; and the valve is arranged on the communicating pipeline to control opening and closing of the communicating pipeline. The energy-saving pump has the effect of preventing long-time low-load operation.

Description

Technical Field

[0001] This invention relates to the field of energy-saving pump technology, and in particular to an energy-saving pump set and a method for controlling the linkage of multiple energy-saving pumps. Background Technology

[0002] Energy-saving pumps are core general-purpose machines that convert mechanical energy into fluid kinetic energy and pressure energy. They are widely used in key sectors of the national economy, such as urban water supply, building heating and ventilation, industrial production, agricultural irrigation, and energy and chemical industries.

[0003] In related technologies, to meet the peak demand of the system, a single high-power energy-saving pump is usually used as the power unit. To improve its operating efficiency, the industry generally adopts variable frequency speed control technology, which adjusts the pump speed to adapt to flow changes, in order to replace the traditional valve throttling regulation method.

[0004] Regarding the aforementioned technologies, in actual operation, energy-saving pumps are selected based on a combination of fixed-parameter models to adapt to the maximum operating conditions. However, during actual operation, the power demand of the energy-saving pump is far lower than the maximum value for most of the working time, resulting in a long period of low-load operation for a single energy-saving pump, which leads to a sharp decline in the actual operating efficiency of the energy-saving pump. Summary of the Invention

[0005] To prevent energy-saving pumps from operating at low load for extended periods, this invention provides an energy-saving pump set and a method for controlling the linkage of multiple energy-saving pumps.

[0006] In a first aspect, the present invention provides an energy-saving pump set, which adopts the following technical solution: An energy-saving pump set includes several energy-saving pumps for conveying media, a motor mounted on the energy-saving pumps to drive the energy-saving pumps, a connecting pipe fixedly connected to the energy-saving pumps to convey the media in each energy-saving pump respectively, a conveying pipe fixedly connected to the connecting pipes to connect the energy-saving pumps in parallel, and a valve mounted on the connecting pipes to control the opening and closing of the connecting pipes.

[0007] By adopting the above technical solution, several energy-saving pumps form a parallel structure with the conveying pipeline through the connecting pipeline. On the one hand, one or more energy-saving pumps can be flexibly activated according to the medium conveying requirements, avoiding the aggravated wear caused by long-term low-load operation of a single energy-saving pump, thereby extending the overall service life of the equipment.

[0008] Secondly, a method for coordinated control of multiple energy-saving pumps adopts the following technical solution: A method for coordinated control of multiple energy-saving pumps includes: Step S1: Obtain the required power; Step S2: Based on the preset energy-saving pump numbers, combine any number of energy-saving pumps to obtain the working number group and the corresponding working group power; Step S3: Select work group numbers whose work group power is greater than or equal to the required power, and define the work group number as the expected work group number; Step S4: Locate the rated power based on the expected work number group; Step S5: Calculate the working efficiency of each energy-saving pump in the expected working number group based on the required power and the preset rated power of each energy-saving pump in the expected working number group. Step S6: When the efficiency of each task falls within a reasonable load range, define the corresponding expected task number group as the actual task number group; Step S7: Control the energy-saving pumps corresponding to the actual working number group to work according to their respective working efficiencies.

[0009] By adopting the above technical solution, energy-saving pumps can be flexibly combined according to actual power requirements, ensuring that each energy-saving pump operates within a reasonable load range. This effectively avoids the efficiency decline caused by long-term low-load operation of a single energy-saving pump, not only improving the overall operating efficiency of the energy-saving pump group but also significantly reducing energy consumption, thus achieving the effect of energy conservation and emission reduction.

[0010] Optionally, a further method for determining the actual work number group may also be included, the method comprising: Step S60: Obtain the fluctuation curve of demanded power; Step S61: Obtain the maximum and minimum power demand based on the fluctuation curve analysis; Step S62: When the power of the work group corresponding to the actual work number group is less than the maximum required power, obtain the additional required power based on the power of the work group corresponding to the actual work number group and the maximum required power; Step S63: Based on the additional power demand, find the energy-saving pump number corresponding to the rated power, and form a new actual working number group with the energy-saving pump number and the actual working number group; Step S64: Determine the fluctuating power of a single energy-saving pump based on the maximum demand power, minimum demand power, and new actual operating number group; Step S65: Calculate the fluctuating operating efficiency based on the fluctuating power and the corresponding rated power; Step S66: When the fluctuating work efficiency falls within a reasonable load range, define the corresponding new actual work number group as the actual work number group.

[0011] By adopting the above technical solution, the combination of energy-saving pumps can be dynamically adjusted when facing fluctuations in demand power. This ensures that while meeting the maximum demand power, the working efficiency of each energy-saving pump remains within a reasonable load range, further enhancing the adaptability and stability of the system and effectively avoiding the problems of efficiency decline or energy consumption increase caused by power fluctuations.

[0012] Optional, also includes: Step S67: When the fluctuating operating efficiency does not fall within the reasonable load range, obtain the difference power based on the maximum demand power and the minimum demand power; Step S68: Obtain the number of energy-saving pumps based on the new actual working number group; Step S69: Obtain the average power based on the differential power and the number of energy-saving pumps; Step S70: Calculate the new working efficiency corresponding to each energy-saving pump in the new actual working number group based on the average power and the preset rated power of each energy-saving pump in the new actual working number group. Step S71: When the efficiency of each new job falls within a reasonable load range, define the corresponding new actual job number group as the actual job number group.

[0013] By adopting the above technical solution, when a single energy-saving pump is used to meet fluctuating power demand, if the efficiency of that single energy-saving pump falls outside the reasonable load range, the fluctuating power demand will be distributed to each energy-saving pump, thereby reducing the impact of fluctuating power demand on the efficiency of the energy-saving pump and ensuring that the energy-saving pump can still remain within the reasonable load range while meeting fluctuating power demand.

[0014] Optionally, it also includes selecting an optimization method for fluctuating work efficiency, which includes: Step S660: When there are multiple fluctuating working efficiencies falling within the reasonable load range, sort all the fluctuating working efficiencies falling within the reasonable load range according to the size of the working efficiency to find the largest fluctuating working efficiency. Step S661: Control the energy-saving pump number corresponding to the maximum fluctuating working efficiency to operate according to the maximum fluctuating working efficiency.

[0015] By adopting the above technical solution, when there are multiple fluctuating working efficiencies that meet reasonable load ranges, the energy-saving pump corresponding to the largest fluctuating working efficiency is selected for operation, thereby minimizing the impact of fluctuating demand power on the energy-saving pump and reducing the situation where a single energy-saving pump is affected by fluctuating demand power and operates at low load.

[0016] Optional, also includes: Step S8: Obtain actual traffic; Step S9: Find the required flow rate based on the required power; Step S10: Obtain the flow difference based on the demand flow and the actual flow; Step S11: When the flow difference does not fall within the reasonable error range, output an alarm signal.

[0017] By adopting the above technical solution, the difference between the actual flow rate and the demand flow rate calculated based on the demand power can be monitored in real time, and an alarm signal can be output in a timely manner when the difference exceeds the reasonable error range. This can quickly detect abnormal situations in the system operation, such as pipeline leakage, valve failure, or pump performance degradation, and thus take timely measures to repair or adjust them.

[0018] Optionally, the verification method when the flow difference does not fall within the reasonable error range includes: Step S12: Randomly select one energy-saving pump number from the actual working number group, define the energy-saving pump number as the verification energy-saving pump number, and define the working efficiency corresponding to the verification energy-saving pump number as the verification working efficiency. Step S13: Based on the verification work efficiency, find the corresponding energy-saving pump number; Step S14: Replace the energy-saving pump corresponding to the verification energy-saving pump number with the verification energy-saving pump number and obtain the verification flow rate; Step S15: If the flow rate is inconsistent with the required flow rate, select the next energy-saving pump number to continue to steps S12 to S14. Step S16: When the flow rate is verified to be consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

[0019] By adopting the above technical solution, when the flow difference exceeds the reasonable error range, by replacing the energy-saving pumps in the actual working number group one by one and monitoring and verifying the changes in flow, the specific energy-saving pump causing the abnormal flow can be accurately located. This provides a clear target for subsequent maintenance or replacement work, effectively shortens the troubleshooting time, and improves the reliability and maintenance efficiency of the system.

[0020] Optional, also includes: Step S17: If the energy-saving pump is found to be non-existent, determine the remaining number groups based on the actual working number groups; Step S18: Based on the verification work efficiency, combine the energy-saving pump numbers in the remaining number groups to obtain a verification energy-saving pump number group that meets the verification work efficiency. Step S19: Replace the energy-saving pump corresponding to the verified energy-saving pump number with the verification energy-saving pump number group and obtain the flow rate of the verification group; Step S20: When the flow rate of the verification group is inconsistent with the required flow rate, select the next energy-saving pump number to continue to steps S18 to S19; Step S21: When the flow rate of the verification group is consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

[0021] By adopting the above technical solution, when it is impossible to find a verification energy-saving pump that meets the flow requirements by replacing individual energy-saving pumps, the remaining energy-saving pumps in the numbered group are combined to form a verification energy-saving pump numbered group that meets the efficiency of the verification work, and the original energy-saving pump is replaced for flow verification. This further expands the scope of fault diagnosis, enables more complex situations to accurately find the cause of abnormal flow, and outputs alarm signals and relevant information in a timely manner.

[0022] Optional, also includes: Step S22: When the energy-saving pump number group does not exist, the verification energy-saving pump number corresponding to the inconsistency between the flow rate of the verification group and the required flow rate is defined as the normal energy-saving pump number. Step S23: Obtain the combined verification efficiency based on the verification efficiency and the normal working efficiency corresponding to the normal energy-saving pump number; Step S24: Based on the combined verification work efficiency, find the corresponding combined verification energy-saving pump number; Step S25: Replace the energy-saving pump corresponding to the verification energy-saving pump number and the energy-saving pump corresponding to the normal energy-saving pump number with the combined verification energy-saving pump number and obtain the combined verification flow rate; Step S26: When the combined flow rate and the required flow rate are inconsistent, select the next energy-saving pump number to continue to steps S23 to S25; Step S27: When the combined flow rate matches the required flow rate, output an alarm signal and simultaneously output the verification energy-saving pump number.

[0023] By adopting the above technical solution, when it is still impossible to find a verification energy-saving pump number group that meets the flow requirements by combining the remaining number groups, the scope of fault diagnosis is expanded by combining the energy-saving pump that has been verified and confirmed to be working normally with the energy-saving pump that needs to be verified, and using the combined verification efficiency to find the corresponding verification energy-saving pump number for verification.

[0024] Optional, also includes: Step S28: If the combined verification energy-saving pump number does not exist, find the verification energy-saving pump number with a rated power greater than the power corresponding to the verified working efficiency; Step S29: Calculate the large-amount verification efficiency based on the verification efficiency and the rated power corresponding to the large-amount energy-saving pump number; Step S30: When the efficiency of the large-amount verification work falls within a reasonable load range, replace the energy-saving pump corresponding to the verification energy-saving pump number with the energy-saving pump number of the large-amount verification, and control the energy-saving pump corresponding to the energy-saving pump number of the large-amount verification to work according to the efficiency of the large-amount verification work and obtain the large-amount verification flow. Step S31: When the large amount of flow verification is inconsistent with the required flow, select the next energy-saving pump number to continue to steps S28 to S30; Step S32: When the flow rate is consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

[0025] By adopting the above technical solution, when the combined verification energy-saving pump number does not exist, that is, when it is impossible to find a suitable energy-saving pump for verification by combining the verification energy-saving pump with the normal energy-saving pump, the range of energy-saving pumps that can be verified is expanded by finding a high-value verification energy-saving pump with a higher rated power and calculating a new high-value verification efficiency based on its rated power and the current verification efficiency.

[0026] In summary, the present invention has at least one of the following beneficial technical effects: By connecting multiple energy-saving pumps in parallel, the operating status of the pump group can be flexibly adjusted according to the actual power demand, ensuring that each energy-saving pump always works within a reasonable load range, significantly improving the overall energy efficiency of the system and reducing operating energy consumption. For power fluctuation conditions, the operation strategy of energy-saving pump sets can be dynamically adjusted. Through power sharing and other methods, the system can effectively cope with load changes, avoid long-term inefficient operation of a single pump, and enhance the system's adaptability and stability. By introducing a flow monitoring and diagnostic mechanism, a multi-level verification process can be automatically executed when the flow is abnormal, accurately locating the faulty energy-saving pump and ensuring the stable operation of the system. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an energy-saving pump set according to an embodiment of this application; Figure 2 This is a flowchart of a multi-energy-saving pump linkage control method according to an embodiment of this application; Figure 3 This is a schematic diagram illustrating the method for obtaining the maximum and minimum required power in an embodiment of this application.

[0028] The parts referred to by the numbers in the above attached diagrams are as follows: 1. Energy-saving pump; 2. Motor; 3. Connecting pipe; 4. Delivery pipe; 5. Valve. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0030] This invention discloses an energy-saving pump set.

[0031] Reference Figure 1An energy-saving pump set includes an energy-saving pump 1, a motor 2, connecting pipes 3, delivery pipes 4, and valves 5. The number of energy-saving pumps 1 is several. The output shaft of the motor 2 is fixedly connected to the energy-saving pump 1 to drive it. The connecting pipes 3 are fixedly connected to the energy-saving pump 1 to transport the medium in each pump 1. The delivery pipes 4 are fixedly connected to each connecting pipe 3 to transport the medium transported by the energy-saving pump 1 through the connecting pipes 3. Valves 5 are installed on each connecting pipe 3 to control the connection and closure between each energy-saving pump 1 and the delivery pipe 4.

[0032] Based on the same inventive concept, embodiments of the present invention provide a method for the coordinated control of multiple energy-saving pumps.

[0033] Reference Figure 2 A method for coordinated control of multiple energy-saving pumps, comprising: Step S1: Obtain the required power.

[0034] Power demand refers to the total power required under the current working conditions. Power demand is calculated in advance by staff based on the work scenario and then entered into the system.

[0035] Step S2: Based on the preset energy-saving pump number, combine energy-saving pump 1 in any number of ways to obtain the working number group and the corresponding working group power.

[0036] The energy-saving pump number refers to a unique identifier assigned to each energy-saving pump, such as No. 1, No. 2, No. 3, etc. The energy-saving pump number is pre-entered by staff based on the quantity of energy-saving pumps.

[0037] A work number group refers to a numbered group with clearly defined members formed by combining any number of energy-saving pumps 1. It includes all energy-saving pumps 1 that make up this work number group. For example, a work number group named "235" represents an energy-saving pump group composed of energy-saving pumps 1, numbers 2, 3, and 5. This is obtained by the control system automatically arbitrarily combining the energy-saving pump numbers to generate different work number groups.

[0038] The working group power refers to the total power obtained by adding the rated power of all energy-saving pumps 1 in the working group. For example, the working group named 235 represents the sum of the rated power of energy-saving pumps 2, 3, and 5 respectively. For ease of understanding, the power here and thereafter is simply represented by numbers. For example, if the power of energy-saving pump 1 is 10, the power of energy-saving pump 1 is 20, and the power of energy-saving pump 1 is 50, then the working group power of 235 is 10 + 20 + 50 = 80. This is obtained by the control system automatically adding the rated power of all energy-saving pumps 1 in the working group to calculate the working group power.

[0039] Step S3: Select work number groups whose work group power is greater than or equal to the required power, and define these work number groups as the expected work number groups.

[0040] The projected work group refers to the work group numbering group that, in the initial screening, meets the condition that the work group power is greater than or equal to the required power. For example, if the required power is 70, and the work group power of the previously mentioned work group numbering group 235 is 80, which is greater than the required power of 70, then group 235 will be defined as the projected work group numbering group. This is obtained by the control system comparing the work group power with the required power for each work group numbering group, selecting the work group numbering groups that meet the condition of work group power being greater than or equal to the required power, and marking these work group numbering groups as projected work group numbering groups.

[0041] Step S4: Locate the rated power based on the expected work number group.

[0042] Rated power refers to the rated output power of a single energy-saving pump 1. The rated power is pre-entered by the staff based on the parameters of each energy-saving pump 1.

[0043] Step S5: Calculate the working efficiency of each energy-saving pump 1 in the expected working number group based on the required power and the preset rated power of each energy-saving pump 1 in the expected working number group.

[0044] Operating efficiency refers to the actual operating efficiency of each energy-saving pump 1 in the expected work group under the required power. The operating efficiency is calculated by dividing the operating power of energy-saving pump 1 (operating power refers to the actual power output by energy-saving pump 1 during operation) by its rated power. For example, if the required power is 64, the operating powers of each energy-saving pump 1 in work group 235 would be 8, 16, and 40 respectively, and the operating efficiency of all energy-saving pumps 1 in group 235 would be 80%.

[0045] Step S6: When the efficiency of each task falls within a reasonable load range, define the corresponding expected task number group as the actual task number group.

[0046] The reasonable load range refers to a reasonable range within which the energy-saving pump 1 should operate at its efficiency during normal operation. This range ensures stable operation of the energy-saving pump 1 and reasonable energy consumption. The reasonable load range is pre-tested and entered by the operator based on the performance of the energy-saving pump 1; for example, an efficiency of 75% to 100% is considered a reasonable load range.

[0047] The actual working number group refers to the number group of energy-saving pump combinations that are ultimately determined for actual operation. When the operating efficiency of each energy-saving pump 1 in the expected working number group is within the pre-set reasonable load range, it means that the energy-saving pump 1 in that expected working number group will operate within a reasonable efficiency range during operation, and there will be no prolonged low-load or overload operation. Therefore, this expected working number group will be officially designated as the actual working number group. Step S7: Control the energy-saving pump 1 corresponding to the actual working number group to work according to its respective working efficiency.

[0048] After determining the actual working number group, the energy-saving pump 1 corresponding to the actual working number group is controlled to work according to its respective working efficiency. This ensures that the energy-saving pump 1 is within a reasonable load range during actual operation, avoids long-term low-load operation or overload operation, improves the working efficiency and stability of the energy-saving pump 1, reduces energy consumption, and ensures the stability of the operation of the energy-saving pump 1.

[0049] This also includes a method for further determining the actual work number group, which includes: Step S60: Obtain the fluctuation curve of the required power.

[0050] like Figure 3 As shown, the fluctuation curve refers to the curve representing the changes and fluctuations in power demand due to actual working conditions. The X-axis of the fluctuation curve represents time, and the Y-axis represents the value of the demanded power. The fluctuation curve is obtained by a power monitoring module installed within the control system, which collects and records the data on the change of demanded power over time in real time, and then plots the fluctuation curve of the demanded power.

[0051] Step S61: Obtain the maximum and minimum power demand based on the fluctuation curve analysis.

[0052] like Figure 3 As shown, maximum demand power refers to the power corresponding to the maximum value on the demand power fluctuation curve. Maximum demand power is obtained by projecting each point of the fluctuation curve onto the Y-axis; the maximum value projected onto the Y-axis is the maximum demand power. Minimum demand power refers to the power corresponding to the minimum value on the demand power fluctuation curve. Minimum demand power is obtained by projecting each point of the fluctuation curve onto the Y-axis; the minimum value projected onto the Y-axis is the minimum demand power.

[0053] Step S62: When the power of the work group corresponding to the actual work number group is less than the maximum required power, the additional required power is obtained based on the power of the work group corresponding to the actual work number group and the maximum required power.

[0054] Additional power demand refers to the extra power required when the power of the workgroup corresponding to the actual work group cannot meet the maximum power demand. The additional power demand is calculated by subtracting the power of the workgroup corresponding to the actual work group from the maximum power demand. For example, if the maximum power demand is 85, and the power of the workgroup corresponding to the actual work group is 80, then the additional power demand is 5.

[0055] Step S63: Based on the additional power demand, find the energy-saving pump number corresponding to the rated power, and form a new actual working number group with the energy-saving pump number and the actual working number group.

[0056] A new actual working number group refers to a new working number group formed by combining the corresponding energy-saving pump number found through the additional required power when the working power of the original working number group cannot meet the maximum required power. For example, if the original actual working number group is 235, and the additional required power is 5 when the maximum required power is 85, then the energy-saving pump number found based on the additional required power would be, for example, energy-saving pump 1 with a rated power of 5. The new actual working number group would then be a new group 1235, formed by combining energy-saving pump 1 with the actual working number group of group 235.

[0057] Step S64: Determine the fluctuating power of a single energy-saving pump 1 based on the maximum demand power, minimum demand power, and new actual working number group.

[0058] Fluctuating power refers to the power of an energy-saving pump 1 in the new actual working number group when it adjusts its own operating power to adapt to the fluctuation curve of demand power. If the maximum demand power of the fluctuation curve is 85 and the minimum demand power is 75, and energy-saving pump 1 in group 1235 adjusts its own operating power to adapt to the fluctuation curve of demand power, then when the rated power of energy-saving pump 1 in group 3 is 50, the fluctuating power of energy-saving pump 1 in group 5 is 40.

[0059] Step S65: Calculate the fluctuating operating efficiency based on the fluctuating power and the corresponding rated power.

[0060] Fluctuation efficiency refers to the efficiency of energy-saving pump 1 when it operates at fluctuating power. Fluctuation efficiency is obtained by dividing the power corresponding to the fluctuating power by the rated power. For example, if the fluctuating power of energy-saving pump 1 (No. 5) is 40, and the rated power of energy-saving pump 1 (No. 3) is 50, then the fluctuation efficiency of energy-saving pump 1 (No. 3) is 80%.

[0061] Step S66: When the fluctuating work efficiency falls within a reasonable load range, define the corresponding new actual work number group as the actual work number group.

[0062] When the fluctuating operating efficiency falls within the reasonable load range, it indicates that the new actual working number group can not only meet the dynamically changing power demand, but also keep the energy-saving pump 1 within the reasonable load range, avoiding low-load or overload operation, thereby ensuring that the energy-saving pump 1 works stably and efficiently.

[0063] This also includes: Step S67: When the fluctuating operating efficiency does not fall within the reasonable load range, obtain the difference power based on the maximum demand power and the minimum demand power.

[0064] When the fluctuating operating efficiency does not fall within the reasonable load range, it indicates that using a single energy-saving pump 1 to adapt to fluctuating power demand cannot make the energy-saving pump 1 operate within the reasonable load range. The differential power refers to the power difference between the maximum and minimum demand power. The differential power is obtained by subtracting the minimum demand power from the maximum demand power. For example, if the maximum demand power is 85 and the minimum demand power is 78, then the differential power is 7.

[0065] Step S68: Obtain the number of energy-saving pumps based on the new actual working number group.

[0066] The number of energy-saving pumps refers to the total number of energy-saving pumps 1 included in the new actual working number group. The number of energy-saving pumps is obtained by counting the energy-saving pump numbers in the new actual working number group. For example, if the new actual working number group is 1235, then the number of energy-saving pumps is 4.

[0067] Step S69: Obtain the average power based on the differential power and the number of energy-saving pumps.

[0068] Average power refers to the power value obtained by evenly distributing the differential power to each energy-saving pump 1 in the new actual working number group. The average power is calculated by dividing the differential power by the number of energy-saving pumps. For example, if the differential power is 7 and there are 4 energy-saving pumps, then the average power is 1.75.

[0069] Step S70: Calculate the new working efficiency corresponding to each energy-saving pump 1 in the new actual working number group based on the average power and the preset rated power of each energy-saving pump 1 in the new actual working number group.

[0070] The new working efficiency refers to the working efficiency of each energy-saving pump 1 in the new actual working number group under the influence of the average power. The calculation method for the new working efficiency is as follows: first, adjust the power distribution of each energy-saving pump 1 in the new actual working number group according to the average power; then, divide the adjusted working power of each energy-saving pump 1 by its rated power. For example, if the new actual working number group is 235, where energy-saving pump 1 number 2 has a rated power of 10, energy-saving pump 1 number 3 has a rated power of 20, and energy-saving pump 1 number 5 has a rated power of 50, assuming a power difference of 6, 3 energy-saving pumps, and an average power of 2, then the new working efficiency of energy-saving pump 1 number 2 is 80% (8 divided by 10), the new working efficiency of energy-saving pump 1 number 3 is 90% (18 divided by 20), and the new working efficiency of energy-saving pump 1 number 5 is 96% (48 divided by 50).

[0071] Step S71: When the efficiency of each new job falls within a reasonable load range, define the corresponding new actual job number group as the actual job number group.

[0072] Taking step S70 as an example, the new working efficiency of energy pump 1 No. 2 is 80%, the new working efficiency of energy pump 1 No. 3 is 90%, and the new working efficiency of energy pump 1 No. 5 is 96%. The new working efficiencies of the three energy pumps 1 all fall within the reasonable load range, indicating that the three energy pumps 1 will not run at low load for a long time. Therefore, the corresponding new actual working number group is defined as the actual working number group.

[0073] This also includes an optimization method for selecting fluctuating work efficiency, which includes: Step S660: When multiple fluctuating working efficiencies fall within a reasonable load range, sort all fluctuating working efficiencies within the reasonable load range according to their working efficiency to find the largest fluctuating working efficiency.

[0074] Maximum fluctuating efficiency refers to the highest efficiency value among all fluctuating efficiencies falling within the reasonable load range. For example, if multiple fluctuating efficiencies are 80%, 85%, and 90%, then 90% is the maximum fluctuating efficiency.

[0075] Step S661: Control the energy-saving pump number corresponding to the maximum fluctuating working efficiency to operate according to the maximum fluctuating working efficiency.

[0076] The energy-saving pump number corresponding to the maximum fluctuating working efficiency is controlled to operate at the maximum fluctuating working efficiency. For example, if the maximum fluctuating working efficiency is 90%, the corresponding energy-saving pump number is Energy Pump No. 6 1. Then, Energy Pump No. 6 1 is controlled to operate at 90% working efficiency, thereby minimizing the impact of the fluctuation in demand power on Energy Pump No. 1.

[0077] This also includes: Step S8: Obtain actual traffic.

[0078] Actual flow rate refers to the total flow rate of the medium (such as water) output by the energy-saving pump set. The actual flow rate is obtained by installing a flow monitoring device at the output end of the energy-saving pump set. This device can measure and record the flow rate data of the medium output by the energy-saving pump set in real time, thus obtaining the actual flow rate.

[0079] Step S9: Find the required flow rate based on the required power.

[0080] Demand flow rate refers to the theoretically required flow rate of the medium that the energy-saving pump set should output, under the condition of meeting the current power demand. The demand flow rate is found by referring to a pre-entered table of the correspondence between power demand and demand flow rate, and by searching the table for the matching demand flow rate value based on the current power demand.

[0081] Step S10: Obtain the traffic difference based on the demand traffic and the actual traffic.

[0082] The flow difference refers to the difference between the actual flow and the demand flow. The flow difference is calculated by subtracting the actual flow from the demand flow.

[0083] Step S11: When the flow difference does not fall within the reasonable error range, output an alarm signal.

[0084] The reasonable error range refers to the range of error in the actual flow rate caused by mechanical structure or environmental factors. This reasonable error range is obtained and input by staff through multiple prior experiments. If the flow rate difference does not fall within the reasonable error range, it indicates that energy-saving pump 1 is experiencing a significant difference between the actual and required flow rates due to damage or wear. The damaged energy-saving pump 1 needs to be identified and repaired promptly.

[0085] An alarm signal is a signal used to alert staff to abnormal conditions in the energy-saving pump unit. The alarm signal is implemented by emitting a warning sound and flashing red light through an audible and visual alarm, thereby alerting staff to a malfunction in the energy-saving pump.

[0086] This also includes a verification method when the flow difference does not fall within a reasonable error range, the method comprising: Step S12: Randomly select one energy-saving pump number from the actual working number group, define the energy-saving pump number as the verification energy-saving pump number, and define the working efficiency corresponding to the verification energy-saving pump number as the verification working efficiency.

[0087] Verifying the energy-saving pump number refers to selecting the number of energy-saving pump 1 that needs to be verified from the actual working number group. This number is obtained by randomly selecting one energy-saving pump number from the actual working number group. Verifying the working efficiency refers to verifying the working efficiency of energy-saving pump 1 corresponding to the specified energy-saving pump number.

[0088] Step S13: Based on the verification work efficiency, find the corresponding energy-saving pump number.

[0089] The verification of the energy-saving pump number refers to the number of the energy-saving pump 1 used to verify the energy-saving pump 1 corresponding to the verification energy-saving pump number. For example, if the verification energy-saving pump number is 5 energy-saving pump 1, the rated power of 5 energy-saving pump 1 is 50, and the working efficiency of 5 energy-saving pump 1 is 80%, then the verification energy-saving pump number is 4 energy-saving pump 1 with a rated power of 40.

[0090] Step S14: Replace the energy-saving pump 1 corresponding to the verification energy-saving pump number with the verification energy-saving pump number and obtain the verification flow rate.

[0091] The flow rate verification refers to verifying the flow rate of energy-saving pump 1 corresponding to the verification energy-saving pump number when it works together with other energy-saving pumps 1 in the actual working number group, after replacing the verification energy-saving pump number with the energy-saving pump 1 corresponding to the verification energy-saving pump number. The method for obtaining the flow rate verification is the same as the method for obtaining the actual flow rate in step S8, and will not be repeated here.

[0092] Step S15: If the flow rate is inconsistent with the required flow rate, select the next energy-saving pump number to continue to steps S12 to S14.

[0093] If the flow rate is inconsistent with the required flow rate, it indicates that the faulty energy-saving pump 1 is not the energy-saving pump 1 corresponding to the verification energy-saving pump number. Continue to select the next energy-saving pump 1 from the actual working number group and re-verify.

[0094] Step S16: When the flow rate is verified to be consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

[0095] When the flow rate matches the required flow rate, it indicates that the energy-saving pump 1 corresponding to the verification energy-saving pump number is the faulty energy-saving pump 1. An alarm signal is output to remind the staff of the fault, and the verification energy-saving pump number is also output to accurately inform the staff of the faulty energy-saving pump number, so as to facilitate the staff to carry out maintenance.

[0096] This also includes: Step S17: If the energy-saving pump is not found, determine the remaining number groups based on the actual working number groups.

[0097] The remaining number group refers to all energy-saving pump numbers remaining after removing the energy-saving pump numbers from the actual working number group from all energy-saving pump numbers. For example, if there are energy-saving pumps numbered 1 to 9, and the actual working number group is 12347, then the remaining number group is 5689. If the energy-saving pump is not found during verification, it means that an energy-saving pump with a rated power matching the current working power of the verified energy-saving pump number cannot be found.

[0098] Step S18: Based on the verification work efficiency, combine the energy-saving pump numbers in the remaining number groups to obtain a verification energy-saving pump number group that meets the verification work efficiency.

[0099] The energy-saving pump number verification group refers to the group of energy-saving pump numbers used to verify the energy-saving pump 1 corresponding to the verification energy-saving pump number. For example, if the verification efficiency of energy-saving pump 1 corresponding to the verification energy-saving pump number is 80% and the rated power is 50, then the energy-saving pump number verification group is group 13, consisting of energy-saving pump 1 with a rated power of 10 and energy-saving pump 1 with a rated power of 30. In this case, group 13 is the energy-saving pump number verification group.

[0100] Step S19: Replace the energy-saving pump 1 corresponding to the verification energy-saving pump number with the verification energy-saving pump number group and obtain the flow rate of the verification group.

[0101] The verification group flow rate refers to the flow rate when the energy-saving pump 1 corresponding to the verification energy-saving pump number group works together with other energy-saving pumps 1 in the actual working number group after replacing the energy-saving pump 1 corresponding to the verification energy-saving pump number group. The method for obtaining the verification group flow rate is the same as the method for obtaining the actual flow rate in step S8, and will not be repeated here.

[0102] Step S20: When the flow rate of the verification group is inconsistent with the required flow rate, select the next energy-saving pump number to continue to steps S18 to S19.

[0103] If the flow rate of the verification group is inconsistent with the required flow rate, it indicates that the faulty energy-saving pump 1 is not the energy-saving pump 1 corresponding to the verification energy-saving pump number. Continue to select the next energy-saving pump 1 from the actual working number group and re-verify.

[0104] Step S21: When the flow rate of the verification group is consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

[0105] When the flow rate matches the required flow rate, it indicates that the energy-saving pump 1 corresponding to the verification energy-saving pump number is the faulty energy-saving pump 1. An alarm signal is output to remind the staff of the fault, and the verification energy-saving pump number is also output to accurately inform the staff of the faulty energy-saving pump number, so as to facilitate the staff to carry out maintenance.

[0106] This also includes: Step S22: When the energy-saving pump number group does not exist, the verification energy-saving pump number corresponding to the inconsistency between the flow rate of the verification group and the required flow rate is defined as the normal energy-saving pump number.

[0107] If the energy-saving pump number group is not found, it means that no combination of the remaining number groups can form an energy-saving pump combination whose total output power matches the actual output power of the verified energy-saving pump. The normal energy-saving pump number refers to the number corresponding to energy-saving pump 1 that is determined to be in normal working condition (no fault) after the energy-saving pump number group is replaced.

[0108] Step S23: Obtain the combined verification efficiency based on the verification efficiency and the normal working efficiency corresponding to the normal energy-saving pump number.

[0109] Normal operating efficiency refers to the actual operating efficiency of energy-saving pump 1 corresponding to the normal energy-saving pump number under the current operating conditions (i.e., the output efficiency of the normal energy-saving pump, which is essentially consistent with the operating efficiency defined in step S5). Combined verification operating efficiency refers to the combination of verification operating efficiency and normal operating efficiency. Note that this is not an addition of the two operating efficiencies. Assuming the verification operating efficiency is 80% and the normal operating efficiency is 90%, then the combined verification operating efficiency is the combined operating efficiency composed of both 80% and 90%.

[0110] Step S24: Based on the combined verification work efficiency, find the corresponding combined verification energy-saving pump number.

[0111] The combined verification of energy-saving pump numbers refers to the energy-saving pump number used to replace and verify the energy-saving pump number corresponding to the verification energy-saving pump number (e.g., energy-saving pump 1) and the normal energy-saving pump number. The lookup method involves calculating and searching using the verification efficiency (based on the combined verification efficiency), the rated power corresponding to the verification energy-saving pump number, and the normal operating efficiency and the rated power corresponding to the normal energy-saving pump number. For example, if the rated power of the verification energy-saving pump number is 50 and the verification efficiency is 80%, and the rated power of the normal energy-saving pump number is 40 and the normal operating efficiency is 75%, then the rated power required for the combined verification of the energy-saving pump number should be 50 multiplied by 80% plus 40 multiplied by 75% (70), and then the energy-saving pump number with a rated power of 70 should be searched as the combined verification energy-saving pump number.

[0112] Step S25: Replace the energy-saving pump 1 corresponding to the verification energy-saving pump number and the energy-saving pump 1 corresponding to the normal energy-saving pump number with the combined verification energy-saving pump number and obtain the combined verification flow rate.

[0113] The combined verification flow rate refers to the flow rate when the energy-saving pump 1 corresponding to the combined verification energy-saving pump number group replaces the energy-saving pump 1 corresponding to the verification energy-saving pump number group and the energy-saving pump 1 corresponding to the normal energy-saving pump number group, and works together with other energy-saving pumps 1 in the actual working number group. The method for obtaining the combined verification flow rate is the same as the method for obtaining the actual flow rate in step S8, and will not be repeated here.

[0114] Step S26: When the combined flow rate and the required flow rate are inconsistent, select the next energy-saving pump number to continue to steps S23 to S25.

[0115] If the combined flow rate and the required flow rate are inconsistent, it indicates that the faulty energy-saving pump 1 is not the energy-saving pump 1 corresponding to the verification energy-saving pump number. Continue to select the next energy-saving pump 1 from the actual working number group and re-verify.

[0116] Step S27: When the combined flow rate matches the required flow rate, output an alarm signal and simultaneously output the verification energy-saving pump number.

[0117] When the flow rate matches the required flow rate, it indicates that the energy-saving pump 1 corresponding to the verification energy-saving pump number is the faulty energy-saving pump 1. An alarm signal is output to remind the staff of the fault, and the verification energy-saving pump number is also output.

[0118] This also includes: Step S28: If the combined verification energy-saving pump number does not exist, find the large verification energy-saving pump number whose rated power is greater than the power corresponding to the verified working efficiency.

[0119] If the combined verification energy-saving pump number does not exist, it means that there is no energy-saving pump 1 that can replace the energy-saving pump 1 corresponding to the verification energy-saving pump number and the energy-saving pump 1 corresponding to the normal energy-saving pump number for verification. The large-amount verification energy-saving pump number refers to the number of a single energy-saving pump 1 whose rated power is greater than the actual output power of the verification energy-saving pump. It is used to replace the original verification energy-saving pump for flow verification when the combined verification energy-saving pump number does not exist. The search method is to filter out energy-saving pump numbers with rated power greater than the actual output power of the verification energy-saving pump from the energy-saving pump numbers excluding the actual working number group. For example, if the rated power of the verification energy-saving pump is 50 and the verification efficiency is 80%, then the energy-saving pump number with a rated power greater than 40 is searched as the large-amount verification energy-saving pump number.

[0120] Step S29: Calculate the large-amount verification efficiency based on the verification efficiency and the rated power corresponding to the large-amount energy-saving pump number.

[0121] The efficiency of large-scale verification refers to the efficiency of replacing and verifying the energy-saving pump 1 corresponding to the verification energy-saving pump number. For example, if the rated power of the verification energy-saving pump number is 40 and the verification efficiency is 90%, and the rated power of the large-scale energy-saving pump number is 45, then the efficiency of large-scale verification is 80%, which is 40 multiplied by 90% and then divided by 45.

[0122] Step S30: When the efficiency of the large-amount verification work falls within a reasonable load range, replace the energy-saving pump 1 corresponding to the verification energy-saving pump number with the energy-saving pump number of the large-amount verification, and control the energy-saving pump 1 corresponding to the energy-saving pump number of the large-amount verification to work according to the efficiency of the large-amount verification and obtain the large-amount verification flow.

[0123] When the efficiency of the large-scale verification work falls within a reasonable load range, it indicates that when verifying the energy-saving pump number using the large-scale verification energy-saving pump number, the energy-saving pump 1 corresponding to the large-scale verification energy-saving pump number is in a safe and reasonable working state and will not be in a low-load state. The large-scale verification flow rate refers to the flow rate of energy-saving pump 1 corresponding to the large-scale verification energy-saving pump number when it works together with other energy-saving pumps 1 in the actual working number group according to the large-scale verification work efficiency, after replacing the energy-saving pump 1 corresponding to the verification energy-saving pump number with the large-scale verification energy-saving pump number. The method for obtaining the large-scale verification flow rate is the same as the method for obtaining the actual flow rate in step S8, and will not be repeated here.

[0124] Step S31: When the large-value verification flow rate is inconsistent with the required flow rate, select the next energy-saving pump number to continue to steps S28 to S30.

[0125] If the flow rate for large-scale verification is inconsistent with the required flow rate, it indicates that the faulty energy-saving pump 1 is not the energy-saving pump 1 corresponding to the verification energy-saving pump number. Continue to select the next energy-saving pump 1 from the actual working number group and re-verify.

[0126] Step S32: When the flow rate is consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

[0127] When the flow rate for large-scale verification matches the required flow rate, it indicates that the energy-saving pump 1 corresponding to the verification energy-saving pump number at this time is the energy-saving pump 1 that has malfunctioned. An alarm signal is output to remind the staff of the malfunction, and the verification energy-saving pump number is also output.

[0128] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. An energy-saving pump set, characterized in that, It includes several energy-saving pumps (1) for conveying media, motors (2) installed on the energy-saving pumps (1) to drive the energy-saving pumps (1), connecting pipes (3) fixedly connected to the energy-saving pumps (1) to convey the media in each energy-saving pump (1) respectively, conveying pipes (4) fixedly connected to the connecting pipes (3) to connect the energy-saving pumps (1) in parallel, and valves (5) installed on the connecting pipes (3) to control the opening and closing of the connecting pipes (3).

2. A method for coordinated control of multiple energy-saving pumps, applied to an energy-saving pump set as described in claim 1, characterized in that, include: Step S1: Obtain the required power; Step S2: Based on the preset energy-saving pump number, combine the energy-saving pump (1) in any number to obtain the working number group and the corresponding working group power; Step S3: Select work group numbers whose work group power is greater than or equal to the required power, and define the work group number as the expected work group number; Step S4: Locate the rated power based on the expected work number group; Step S5: Calculate the working efficiency of each energy-saving pump (1) in the expected working number group based on the required power and the preset rated power of each energy-saving pump (1) in the expected working number group; Step S6: When the efficiency of each task falls within a reasonable load range, define the corresponding expected task number group as the actual task number group; Step S7: Control the energy-saving pumps (1) corresponding to the actual working number group to work according to their respective working efficiencies.

3. The method for coordinated control of multiple energy-saving pumps according to claim 2, characterized in that, It also includes a further method for determining the actual work number group, which includes: Step S60: Obtain the fluctuation curve of demanded power; Step S61: Obtain the maximum and minimum power demand based on the fluctuation curve analysis; Step S62: When the power of the work group corresponding to the actual work number group is less than the maximum required power, the additional required power is obtained based on the power of the work group corresponding to the actual work number group and the maximum required power. Step S63: Based on the additional power demand, find the energy-saving pump number corresponding to the rated power, and form a new actual working number group with the energy-saving pump number and the actual working number group; Step S64: Determine the fluctuating power of a single energy-saving pump (1) based on the maximum demand power, minimum demand power, and new actual working number group; Step S65: Calculate the fluctuating operating efficiency based on the fluctuating power and the corresponding rated power; Step S66: When the fluctuating work efficiency falls within a reasonable load range, define the corresponding new actual work number group as the actual work number group.

4. The method for coordinated control of multiple energy-saving pumps according to claim 3, characterized in that, Also includes: Step S67: When the fluctuating operating efficiency does not fall within the reasonable load range, obtain the difference power based on the maximum demand power and the minimum demand power; Step S68: Obtain the number of energy-saving pumps based on the new actual working number group; Step S69: Obtain the average power based on the differential power and the number of energy-saving pumps; Step S70: Calculate the new working efficiency corresponding to each energy-saving pump (1) in the new actual working number group based on the average power and the preset rated power of each energy-saving pump (1) in the new actual working number group; Step S71: When the efficiency of each new job falls within a reasonable load range, define the corresponding new actual job number group as the actual job number group.

5. The method for coordinated control of multiple energy-saving pumps according to claim 3, characterized in that, It also includes optimization methods for selecting fluctuating work efficiency, which include: Step S660: When there are multiple fluctuating working efficiencies falling within the reasonable load range, sort all the fluctuating working efficiencies falling within the reasonable load range according to the size of the working efficiency to find the largest fluctuating working efficiency. Step S661: Control the energy-saving pump number corresponding to the maximum fluctuating working efficiency to operate according to the maximum fluctuating working efficiency.

6. The method for coordinated control of multiple energy-saving pumps according to claim 2, characterized in that, Also includes: Step S8: Obtain actual traffic; Step S9: Find the required flow rate based on the required power; Step S10: Obtain the flow difference based on the demand flow and the actual flow; Step S11: When the flow difference does not fall within the reasonable error range, output an alarm signal.

7. The method for coordinated control of multiple energy-saving pumps according to claim 6, characterized in that, The verification methods when the flow difference does not fall within the reasonable error range include: Step S12: Randomly select one energy-saving pump number from the actual working number group, define the energy-saving pump number as the verification energy-saving pump number, and define the working efficiency corresponding to the verification energy-saving pump number as the verification working efficiency. Step S13: Based on the verification work efficiency, find the corresponding energy-saving pump number; Step S14: Replace the energy-saving pump (1) corresponding to the verification energy-saving pump number with the verification energy-saving pump number and obtain the verification flow rate; Step S15: If the flow rate is inconsistent with the required flow rate, select the next energy-saving pump number to continue to steps S12 to S14. Step S16: When the flow rate is verified to be consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

8. The method for coordinated control of multiple energy-saving pumps according to claim 7, characterized in that, Also includes: Step S17: If the energy-saving pump is found to be non-existent, determine the remaining number groups based on the actual working number groups; Step S18: Based on the verification work efficiency, combine the energy-saving pump numbers in the remaining number groups to obtain a verification energy-saving pump number group that meets the verification work efficiency. Step S19: Replace the energy-saving pump (1) corresponding to the verification energy-saving pump number with the verification energy-saving pump number group and obtain the flow rate of the verification group; Step S20: When the flow rate of the verification group is inconsistent with the required flow rate, select the next energy-saving pump number to continue to steps S18 to S19; Step S21: When the flow rate of the verification group is consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

9. The method for coordinated control of multiple energy-saving pumps according to claim 8, characterized in that, Also includes: Step S22: When the energy-saving pump number group does not exist, the verification energy-saving pump number corresponding to the inconsistency between the flow rate of the verification group and the required flow rate is defined as the normal energy-saving pump number. Step S23: Obtain the combined verification efficiency based on the verification efficiency and the normal working efficiency corresponding to the normal energy-saving pump number; Step S24: Based on the combined verification work efficiency, find the corresponding combined verification energy-saving pump number; Step S25: Replace the energy-saving pump (1) corresponding to the verification energy-saving pump number and the energy-saving pump (1) corresponding to the normal energy-saving pump number with the combined verification energy-saving pump number and obtain the combined verification flow rate; Step S26: When the combined flow rate and the required flow rate are inconsistent, select the next energy-saving pump number to continue to steps S23 to S25; Step S27: When the combined flow rate matches the required flow rate, output an alarm signal and simultaneously output the verification energy-saving pump number.

10. A method for coordinated control of multiple energy-saving pumps according to claim 9, characterized in that, Also includes: Step S28: If the combined verification energy-saving pump number does not exist, find the verification energy-saving pump number with a rated power greater than the power corresponding to the verified working efficiency; Step S29: Calculate the large-amount verification efficiency based on the verification efficiency and the rated power corresponding to the large-amount energy-saving pump number; Step S30: When the efficiency of the large-amount verification work falls within a reasonable load range, replace the energy pump (1) corresponding to the verification energy pump number with the energy pump number of the large-amount verification energy pump, and control the energy pump (1) corresponding to the energy pump number of the large-amount verification energy pump to work according to the efficiency of the large-amount verification work and obtain the large-amount verification flow rate; Step S31: When the large amount of flow verification is inconsistent with the required flow, select the next energy-saving pump number to continue to steps S28 to S30; Step S32: When the flow rate is consistent with the required flow rate, output an alarm signal and output the verification energy-saving pump number at the same time.

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