Energy-saving control method for water pump unit

Abstract

The invention discloses a water pump unit energy-saving control method, a water pump unit comprises an auxiliary pump and at least one main pump, the auxiliary pump and the main pumps are used for supplying water, and the method comprises the steps that the total flow of the water inlet end and the water outlet end of the water pump unit, state parameters of each pump of the water pump unit and historical water flow data are obtained; according to the total flow and the state parameters of the water inlet end and the water outlet end of the water pump unit and the historical water flow data, the flow needed by current water supply is determined; judging whether the current required water supply flow is within the water supply capacity range of the auxiliary pump or not; if yes, an auxiliary pump is controlled to be started, constant-pressure water supply is conducted at a first pressure value, the first pressure value is larger than a second pressure value preset by the main pump, so that the main pump is subjected to frequency reduction till entering a dormant state, and at the moment, only the auxiliary pump supplies water to the water pump unit; if not, the main pump is controlled to be started, and the operation state of the auxiliary pump is changed and adjusted; and energy conservation is facilitated.

Description

Technical Field

[0001] This invention relates to the field of energy-saving control technology, specifically to an energy-saving control method for water pump units. Background Technology

[0002] Urban water supply is a system that provides water for urban domestic and industrial use, aiming to ensure water quantity, quality, and pressure. Also known as urban water supply, its water sources are primarily surface water and groundwater, serving residential drinking water, municipal public water, fire-fighting water, and industrial production water. The water supply system consists of four main stages: water intake, water transmission, treatment, and water distribution. Water is extracted by facilities, purified at water plants, and then distributed through a pipe network. In urban water supply systems, low- and mid-rise buildings are generally supplied directly by the municipal pipe network, while high-rise buildings typically use a secondary water supply system. Secondary water supply systems are mainly used in residential buildings with 10 or more floors or public buildings exceeding 24 meters in height. The vertical zoning of the water supply system within high-rise buildings needs to be determined comprehensively based on factors such as building purpose, number of floors, usage requirements, and energy consumption.

[0003] In building water supply systems, traditional secondary water supply pump stations typically use 2 to 5 pumps to form a pump set for supplying water to vertical zones. The pump set usually consists of a combination of large and small pumps; the large pump is called the main pump, and the small pump is called the auxiliary pump. The auxiliary pump's flow rate is generally 1 / 3 to 1 / 2 of the main pump's, and its power is also significantly lower than that of the main pump. Taking the water usage patterns of a residential community as an example, peak water usage occurs between 7-9 am and 8-11 pm, while off-peak usage occurs between 1-6 am, with the rest being off-peak. Pumps are typically operated by increasing or decreasing the number of pumps running, combined with frequency converter regulation, to achieve constant pressure water supply. According to design requirements, water usage is low in the early morning hours, so the auxiliary pump should be activated. However, in reality, due to unreasonable control programs or undersized auxiliary pumps, the auxiliary pumps operate for short periods or even not at all, resulting in low utilization rates or even non-operation. Meanwhile, the main pump operates during off-peak hours, leading to energy waste. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides an energy-saving control method for water pump units, breaking away from the traditional approach of relying primarily on the main pump while neglecting the utilization rate of auxiliary pumps. By acquiring the total water flow supplied by the water pump unit and the status parameters of each pump, and based on the total flow, status parameters, and historical water flow data, the current water supply demand is determined. When it is determined that the current water supply demand can be met by the auxiliary pump alone, the main pump can be forced to shut down and enter a dormant state by increasing its outlet pressure setpoint, thereby achieving energy savings. Furthermore, the method provided in this application can be integrated into existing systems without modifying the original control cabinet or interrupting water supply, controlling the operation of both auxiliary and main pumps, making implementation convenient and the modification cost low.

[0005] To address the above problems, the present invention provides the following technical solution: In a first aspect, embodiments of this application provide an energy-saving control method for a water pump unit. The water pump unit includes an auxiliary pump and at least one main pump, which are used for water supply. The energy-saving control method for the water pump unit is executed by an energy-saving control device for the water pump unit, and the method steps include: Obtain the total flow rate at the inlet and outlet of the water pump unit, the status parameters of each pump in the water pump unit, and historical water flow data; Based on the total flow rate at the inlet and outlet of the water pump unit, the status parameters, and the historical water flow data, the required flow rate for the current water supply is determined. Determine whether the current water supply demand is within the water supply capacity of the auxiliary pump; When the judgment is yes, the auxiliary pump is started and constant pressure water supply is provided at the first pressure value. The first pressure value is greater than the second pressure value preset by the main pump, so that the main pump frequency is reduced until it enters the sleep state. At this time, the water pump unit is only supplied by the auxiliary pump. If the judgment is negative, the main pump is started and the operating status of the auxiliary pump is adjusted.

[0006] In some implementations, the required flow rate for the current water supply is determined based on the total flow rate and status parameters at the inlet and outlet of the pump unit, as well as historical water flow data, including: Determine the initial predicted flow rate based on historical water flow data; Based on the total flow rate and status parameters at the inlet and outlet of the water pump unit, the initial predicted flow rate value is compensated, and the compensated flow rate value is the current required flow rate for water supply. The water pump unit's inlet is connected to the water supply source, and its outlet is connected to the user's water supply network. The status parameters include one or more of the following for each pump in the water pump unit: pressure, current, voltage, power, and speed.

[0007] In some implementations, when it is determined that the current required water flow rate is within the water supply capacity range of the auxiliary pump, the auxiliary pump is controlled to start and constant pressure water supply is provided at a first pressure value. If the determination is negative, the main pump is started and the operating status of the auxiliary pump is adjusted. Each pump operates within its high-efficiency operating range, and the operating efficiency corresponding to its flow rate is not lower than a preset threshold.

[0008] In some embodiments, the pump unit includes an auxiliary pump and a main pump. When the condition is not met, the main pump is started, and the operating state of the auxiliary pump is adjusted. Each pump operates within its high-efficiency operating range, and the operating efficiency corresponding to its flow rate is not lower than a preset threshold, including: When the current water supply required is within the high-efficiency operating range of a main pump, the auxiliary pump is stopped and the main pump is operated. When the current water supply flow exceeds the high-efficiency operating range of a single main pump, but is within the combined high-efficiency operating range of a main pump and an auxiliary pump operating together, control the operation of a main pump and an auxiliary pump together.

[0009] In some embodiments, the pump unit includes one auxiliary pump and at least two main pumps. When the condition is not met, the main pumps are started, and the operating status of the auxiliary pumps is adjusted. Each pump operates within its high-efficiency operating range, and the operating efficiency corresponding to its flow rate is not lower than a preset threshold, including: Obtain the combined high-efficiency operating flow range corresponding to each possible pump set combination of one auxiliary pump and multiple main pumps; Match the current water supply flow rate with the combined high-efficiency operating flow range corresponding to each pump set combination, and select the appropriate pump set combination to control the start or stop of the main pump and auxiliary pump.

[0010] In some implementations, the method further includes: when the current water supply required flow falls within the combined high-efficiency operating flow range of multiple pump group combinations, obtaining the total input power of the multiple pump group combinations, and selecting the pump group combination with the lowest total input power; When there are multiple pump group combinations with the lowest total input power, select the pump group combination with the fewest operating pumps. When there are multiple pump group combinations with the lowest total input power and the same number of operating pumps, they are selected according to a preset priority order.

[0011] In some implementations, when there are multiple pump group combinations with the lowest total input power and the same number of operating pumps, selection is performed according to a preset priority order, including: The default priority order is set as follows: Obtain the running time of each main pump and auxiliary pump within the most recent set statistical period, and select the pump group combination that includes the pump with the shortest running time within the most recent set statistical period. If there are multiple pump group combinations, further select the pump group combination that includes the pump with the second shortest running time in the most recent set statistical period, and so on, until a unique combination is selected. If no single combination can be selected, a pump set combination will be selected from the remaining pump set combinations according to a preset fixed priority order.

[0012] In some implementations, obtaining the combined high-efficiency operating flow range corresponding to each possible pump group combination of the one auxiliary pump and multiple main pumps includes: The method for determining the combined high-efficiency operation flow range is as follows: Based on the performance curves of each main pump and auxiliary pump, for each possible pump set combination, determine the relationship curve between the combined flow rate and the head for each pump set combination; wherein the performance curve includes the relationship curve between the flow rate and the head provided by each pump, where the head is the work done by each pump on a unit weight of water flow; the performance curve also includes the relationship curve between the flow rate and the operating efficiency of each pump. When multiple pumps of each pump set are connected in parallel, the head of each pump is equal, the head of each pump is the total head, and the total flow rate of each pump set is the sum of the flow rates of each pump in the pump set at that head. Based on the relationship curve between the flow rate and the head provided by each pump in the pump set, the discrete value of each pump within the predetermined head range is obtained. The discrete values ​​of each pump in the pump set are superimposed to obtain the relationship curve between the combined flow rate and the total head of the pump set. For each operating point of the relationship curve between the combined flow rate and the total head of the pump set, each operating point corresponds to a total head value. Based on the relationship curve between the flow rate and the head provided by each pump and the total head value, the flow rate value of each pump in the pump set is determined. Based on the relationship curve between the flow rate and operating efficiency of each pump and the flow rate value of each pump, the operating efficiency of each pump is determined, and the total operating efficiency of the pump set at this operating point is calculated to generate the relationship curve between the combined flow rate and total efficiency of the pump set combination. This determines the combined high-efficiency operating flow rate range for each pump set combination. The combined high-efficiency operating flow rate range is the range of combined flow rates on the relationship curve between the combined flow rate and total efficiency of the pump set combination where the total efficiency is not lower than a set threshold.

[0013] In some implementations, the required flow rate for the current water supply is matched with the combined high-efficiency operating flow rate range corresponding to each pump group combination, and the corresponding pump group combination is selected to control the start or stop of the main pump and the auxiliary pump. This includes setting a stagnation range for switching the pump group combination, where the stagnation range is based on the predicted flow rate value when the pump group combination was switched last time, with a certain threshold added or reduced. When the current water supply demand is within the stagnant range, the current pump set operation status remains unchanged until the demand change exceeds the stagnant range before a switching operation can be performed.

[0014] In some implementations, the status parameters include one or more of the following: pressure, current, voltage, power, and speed of each pump in the pump unit.

[0015] This application provides an energy-saving control method for a water pump unit. This application obtains the total flow rate at the inlet and outlet of the water pump unit, the status parameters of each pump in the water pump unit, and historical water flow data. Based on the total flow rate at the inlet and outlet of the water pump unit, the status parameters, and the historical water flow data, the method determines the current required water supply flow rate. It then determines whether the current required water supply flow rate is within the water supply capacity range of the auxiliary pump. If so, the auxiliary pump is started to improve the utilization rate of the auxiliary pump, with the starting of the auxiliary pump as the primary method. Attached Figure Description

[0016] Figure 1 This is a schematic flowchart of an energy-saving control method for a water pump unit provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a water pump unit provided in an embodiment of this application; Figure 3 This is a water flow trend chart of total user water usage provided in an embodiment of this application; Figure 4 This is a structural block diagram of an energy-saving control device for a water pump unit provided in an embodiment of this application; Figure 5 This is a structural block diagram of a computer-readable storage medium provided in an embodiment of this application. Detailed Implementation

[0017] The technical solutions of the embodiments of this application 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.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0019] This application provides an energy-saving control method for water pump units, breaking away from the traditional approach of relying primarily on the main pump while the auxiliary pumps are underutilized or not operating. By acquiring the total flow rate at the inlet and outlet of the water pump unit, the status parameters of each pump, and historical water flow data, the current water supply demand is determined. When it is determined that the current water supply demand can be met by the auxiliary pump alone, the main pump can be forced to shut down and enter a dormant state by increasing its outlet pressure setpoint, thereby achieving energy savings. Furthermore, the method provided in this application can be integrated into existing systems without modifying the original control cabinet or interrupting water supply, controlling the operation of both the auxiliary and main pumps. It is convenient to implement and has low modification costs.

[0020] The energy-saving control method for the water pump unit provided in this application will be described in detail below with reference to the accompanying drawings. The water pump unit includes an auxiliary pump and at least one main pump. The auxiliary pump and the main pump are used for water supply. The energy-saving control method for the water pump unit is executed by the energy-saving control equipment of the water pump unit. The water inlet of the water pump unit is connected to the water supply source through the inlet main pipe. In this embodiment, the water supply source is the municipal water supply department. The water outlet of the water pump unit is connected to the user's water supply network through the outlet main pipe. The water pump unit is used to transmit the water provided by the municipal water supply department to the user's water supply network.

[0021] Please see Figure 1 , Figure 1 This is a schematic flowchart of an energy-saving control method for a water pump unit provided in an embodiment of this application. Figure 1 As shown, the energy-saving control method for the water pump unit includes steps S100 to S500.

[0022] Step S100: Obtain the total flow rate at the inlet and outlet of the water pump unit, the status parameters of each pump in the water pump unit, and historical water flow data.

[0023] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of a water pump unit provided in an embodiment of this application. For example... Figure 2 As shown, flow meters P are installed on the inlet and outlet main pipes respectively. The total flow rate at the inlet and outlet ends of the water pump unit is collected by the flow meters P installed on the inlet and outlet main pipes respectively.

[0024] The status parameters of each pump in the pump unit include one or more of the following: pressure, current, voltage, power, and speed. Each pump's outlet pipeline is equipped with a pressure transmitter, which is used to collect the outlet pressure of each pump. Each pump's motor drive circuit is connected to a frequency converter, which is used to collect status parameters such as current, voltage, power, and speed of each pump.

[0025] Please see Figure 3 , Figure 3 This is a water flow trend chart of total user water usage provided in an embodiment of this application. For example... Figure 3 As shown, historical water flow data can be the total flow rate at the outlet of the water pump unit within a month, that is, the total water volume of users in a month.

[0026] Step S200: Determine the current required water supply flow rate based on the total flow rate, status parameters, and historical water consumption data of the water pump unit's inlet and outlet. In some implementations, the required flow rate for the current water supply can be determined through analysis by a PLC or AI chip.

[0027] First, historical water flow data is calculated, for example, obtaining the total flow rate at the outlet of the water pump unit for one month. The average value is then calculated for each time point within a 24-hour period to synthesize an initial predicted flow rate curve for 24 hours. Each time point on the curve corresponds to an initial predicted flow rate value. Except for newly constructed buildings, the water flow patterns of most buildings are relatively stable, such as... Figure 3 As shown, this provides a good basis for predicting the demand side, that is, the current flow rate required for water supply.

[0028] The initial predicted flow rate is compensated based on the total flow rate at the inlet and outlet of the water pump unit. Ideally, the total flow rate at the inlet should be the same as the total flow rate at the outlet. For example, if the total flow rates at the inlet and outlet are different, the initial predicted flow rate needs to be compensated. When the total flow rate at the inlet is greater than the total flow rate at the outlet, it means that the water supplied by the city water supply is greater than the water used by the user; for example, the excess proportion should be within a preset threshold of the initial predicted value. For example The initial predicted flow rate is 1%, at which point the initial predicted flow rate is increased accordingly based on the compensation coefficient. When the total flow rate at the pump unit's inlet is less than the total flow rate at the outlet, for example, if the difference is less than 1% of the initial predicted flow rate, the initial predicted flow rate is decreased accordingly based on the compensation coefficient. Preset threshold. The settings can be configured according to your needs.

[0029] The initial predicted flow rate is compensated based on the state parameters of the pump unit. These state parameters include one or more of pressure, current, voltage, power, and speed. When the pump unit operates at high efficiency, its pressure, current, voltage, power, and speed all have ideal values. Taking current as an example, if the current value of the currently operating large pump is lower than the preset threshold... , If the current is less than a certain percentage of the ideal value, the current initial predicted flow rate is considered too high, and there is no need to operate the existing number of large pumps. The initial predicted flow rate can be reduced. If it is determined that the current initial predicted flow rate requires the activation of auxiliary pumps, the auxiliary pumps can be started directly. Similarly, if the current value of the existing operating large pumps is higher than a preset threshold... , The setting needs to exceed the ideal current value by a certain proportion.

[0030] The value after compensating the initial predicted flow rate is the current required water supply flow rate. When compensating the initial predicted flow rate, compensation can be made solely based on the total flow rate at the inlet and outlet of the water pump unit, solely based on the state parameters of the water pump unit, or both methods can be used together, according to a preset weighting coefficient, for example, both weighting coefficients are 0.5. In some implementations, the prediction time window for determining the current required water supply flow can be set to 10-30 minutes. At regular intervals, the initial predicted flow value is obtained from the 24-hour initial predicted flow curve. Then, compensation is made to the initial predicted flow value based on the total flow at the inlet and outlet of the pump unit, or based on the pump unit's status parameters. Users can set the prediction time window as needed, or add pump start-up / shutdown decisions. These decisions include: when compensating for the current water supply demand, the proportion of the value to be compensated to the initial predicted value continuously exceeds a threshold. The switching step will be executed only after a certain period of time; or when the proportion of the value to be compensated to the initial predicted value continuously exceeds a threshold. The switching procedure is only executed if the running time of the pump unit combination at that time exceeds the predetermined time.

[0031] Step S300: Determine whether the current required water flow rate is within the water supply capacity range of the auxiliary pump; Based on the required water flow rate obtained in step S200, determine whether the required water flow rate is within the water supply capacity range of the auxiliary pump.

[0032] In some implementations, the auxiliary pump needs to operate within its high-efficiency operating range, and the operating efficiency corresponding to its flow rate must not be lower than a preset threshold. threshold Set to 75%.

[0033] By further setting the high-efficiency operating range, the pump's operating efficiency can reach a higher level, thereby saving energy and avoiding the low-energy operation of the auxiliary pump.

[0034] Step S400: When the determination is yes, control the start of the auxiliary pump and supply water at a constant pressure with the first pressure value. The first pressure value is greater than the second pressure value preset by the main pump, so that the main pump reduces the frequency until it enters the sleep state. At this time, the water pump unit is only supplied with water by the auxiliary pump. In some embodiments, the energy-saving control device 400 for the water pump unit is a PLC controller. The energy-saving control device 400 for the water pump unit is used to execute step S400. The PLC controller is connected to a frequency converter that controls the frequency of each pump. After determining whether the required flow rate for water supply is within the water supply capacity range of the auxiliary pump, the PLC controller sends a control command to the PLC controller. The PLC controller starts the auxiliary pump and reduces the frequency of the main pump until it stops.

[0035] Step S500: If the determination is negative, start the main pump and adjust the operating status of the auxiliary pump.

[0036] In some implementations, the pump unit includes an auxiliary pump and a main pump. When the condition is not met, the main pump is started, and the operating status of the auxiliary pump is adjusted, including: When the current water supply required is within the high-efficiency operating range of a main pump, the auxiliary pump is stopped and the main pump is operated. When the current water supply flow exceeds the high-efficiency operating range of a main pump, but is within the combined high-efficiency operating range of a main pump and an auxiliary pump, the main pump and the auxiliary pump are controlled to operate together. The operating efficiency of the main pump and the auxiliary pump in the combined high-efficiency operating flow range is not lower than a preset threshold.

[0037] In some embodiments, the pump unit includes one auxiliary pump and at least two main pumps. When the condition is not met, the main pumps are started, and the operating status of the auxiliary pumps is adjusted, including: Obtain the combined high-efficiency operating flow range for every possible pump set combination of one auxiliary pump and multiple main pumps; for example, refer to... Figure 2 For one auxiliary pump and three main pumps, the three main pumps are main pump 1, main pump 2 and main pump 3. Except for the auxiliary pump operating alone, the pump group combination includes: main pump 1 alone, main pump 2 alone, main pump 3 alone, main pump 1 + auxiliary pump, main pump 2 + auxiliary pump, main pump 3 + auxiliary pump, main pump 1 + main pump 2, main pump 2 + main pump 3, main pump 1 + main pump 3... main pump 1 + main pump 2 + main pump 3 + auxiliary pump; the pump group combination is within its joint high-efficiency operating flow range, which refers to the total flow range in which the overall efficiency of the pumps operating in parallel is not lower than a preset threshold.

[0038] The system matches the current required water supply flow rate with the combined high-efficiency operating flow rate range corresponding to each pump set combination, and selects the appropriate pump set combination. That is, when the current required water supply flow rate is within the combined high-efficiency operating flow rate range of the corresponding pump set combination, the system controls the start-up or shutdown of the main pump and auxiliary pump.

[0039] In some implementations, the method for determining the joint high-efficiency operating flow range is as follows: Based on the performance curves of each main pump and auxiliary pump, for each possible pump combination, determine the relationship curve between the combined flow rate and head for each pump combination; the performance curves include the relationship curve between the flow rate and the head provided by each pump, where the head is the work done by each pump on a unit weight of water flow; the performance curves also include the relationship curve between the flow rate and the operating efficiency of each pump; the relationship curves between the flow rate and the head provided by each pump and the relationship curves between the flow rate and the operating efficiency of each pump can be provided by the manufacturer or obtained through multiple experiments.

[0040] When multiple pumps of each pump set are connected in parallel, the head of each pump is equal, the head of each pump is the total head, and the total flow rate of each pump set is the sum of the flow rates of each pump in the pump set at that head. Based on the relationship curve between the flow rate and the head provided by each pump in the pump set, the discrete value of each pump within the predetermined head range is obtained. The discrete values ​​of each pump in the pump set are superimposed to obtain the relationship curve between the combined flow rate and the total head of the pump set. For each operating point of the relationship curve between the combined flow rate and the total head of the pump set, each operating point corresponds to a total head value. Based on the relationship curve between the flow rate and the head provided by each pump and the total head value, the flow rate value of each pump in the pump set is determined. Based on the relationship curve between flow rate and operating efficiency of each pump and the flow rate value of each pump, the operating efficiency of each pump is determined. The overall operating efficiency of the pump set combination at this operating point is calculated to generate the relationship curve between the combined flow rate and overall efficiency of the pump set combination. This determines the joint high-efficiency operating flow rate range for each pump set combination. The joint high-efficiency operating flow rate range is defined as the overall efficiency not lower than a set threshold on the relationship curve between the combined flow rate and overall efficiency of the pump set combination. The corresponding synthetic flow range. For example, the threshold. Set to 75%.

[0041] Specifically, the overall efficiency is calculated as follows: First, calculate the flow rate of each pump at that operating point and divide it by the efficiency at that point to obtain the input power of each pump. Then, sum these values ​​to obtain the total input power of all pumps. The flow rate and efficiency of each pump at that operating point can be obtained from the relationship curve between the flow rate and operating efficiency of each pump; the total operating efficiency η at that operating point = composite flow rate divided by total input electrical power The combined flow rate corresponding to this operating point can be obtained from the relationship curve between the combined flow rate and total head of the pump set combination. Similarly, the total efficiency at each operating point is calculated to generate the relationship curve between the combined flow rate and total efficiency for that pump set combination. By repeating this process, the relationship curve between the combined flow rate and total efficiency for each pump set combination can be obtained, thereby determining the combined high-efficiency operating flow rate range for each pump set combination.

[0042] When the main pumps in a pump unit are of different models, the relationship curves between the flow rate and the head provided by each main pump, and the relationship curves between the flow rate and the operating efficiency of each pump may be different. In this case, the relationship curves between the combined flow rate and the total efficiency of different pump combinations may be different, but the relationship curves between the combined flow rate and the total efficiency of different pump combinations will have a large overlap. When the main pumps in a pump unit are of the same model, the relationship curves between the flow rate and the operating efficiency of each pump are the same. In this case, there will inevitably be situations where the current water supply required flow rate falls within the combined high-efficiency operating flow rate range of multiple pump combinations.

[0043] To ensure that the number of start-stop cycles for each pump falls within a reasonable range, the start-stop time for each pump can be preset. For example, an operating threshold can be set to 4 hours. If the operating threshold for a single pump is exceeded, a different pump set can be used. (See reference...) Figure 2 The first pump group combination includes main pump 1, main pump 2, main pump 3, and auxiliary pump. The current required water flow rate falls within the combined high-efficiency operating flow range of both the first pump group combination and other pump group combinations. If the operating time of at least one of main pump 1, main pump 2, main pump 3, and auxiliary pump exceeds 4 hours, other pump group combinations can be selected, which meets the requirements for executing the switching procedure. When multiple other pump group combinations exist, they can be selected as follows: The total input power of multiple pump sets can be obtained, and the pump set combination with the lowest total input power can be selected to save energy. When there are multiple pump set combinations with the lowest total input power, the pump set combination with the fewest operating pumps can be selected to reduce the pump's no-load loss and stationary loss.

[0044] When multiple pump group combinations exist with the lowest total input power and the same number of operating pumps, selection is performed according to a preset priority order. The preset priority order is set as follows: The operating time of each main pump and auxiliary pump within the most recent set statistical period is obtained; the pump group combination containing the pump with the shortest operating time within the most recent set statistical period is selected. If multiple pump group combinations exist, the pump group combination containing the pump with the second shortest operating time within the most recent set statistical period is further selected, and so on, until a unique combination is selected. If a unique combination is still not selected, a pump group combination is selected from the remaining pump group combinations according to a preset fixed priority order. This method avoids a pump remaining idle for extended periods, preventing damage to the mechanical structure and electrical components caused by prolonged idleness.

[0045] In some implementations, a stagnation range is set for switching pump unit combinations. This stagnation range is based on the initial predicted flow rate after compensation during the last pump unit combination switch, plus or minus a certain threshold. When the current water supply demand is within the stagnation range, the current pump unit operation remains unchanged until the demand change exceeds the stagnation range before a switchover operation can be performed. This avoids unnecessary switches and reduces equipment wear and energy consumption caused by frequent start-stop cycles.

[0046] The energy-saving control method for pump units provided in this embodiment is applicable to multiple main pumps, both different and the same model. By calculating the relationship curve between the combined flow rate and total head of each pump unit combination, the combined high-efficiency operating flow rate range for each pump unit combination can be obtained. Therefore, based on the current required water supply flow rate, a pump unit combination within this combined high-efficiency operating flow rate range can be selected, thereby improving efficiency and saving energy. Furthermore, when the current required water supply flow rate falls within the combined high-efficiency operating flow rate range of multiple pump unit combinations, a more optimal pump unit combination can be further selected according to the method of this application.

[0047] In summary, the energy-saving control method for water pump units provided in this application has the following advantages: 1. Breaking away from the traditional model where the main pump is the primary operator while the auxiliary pumps are underutilized or not operating, this system obtains the total flow rate at the inlet and outlet of the pump unit, the status parameters of each pump, and historical water flow data. Based on these data, the system determines the current water supply demand. When it is determined that the current water supply demand can be met by the auxiliary pumps alone, the system can increase the outlet pressure setting to force the main pump to shut down and enter a dormant state, thereby achieving energy savings and improving the utilization rate of the auxiliary pumps.

[0048] 2. The method provided in this application can be integrated into the existing system without modifying the original control cabinet or interrupting the water supply, and can control the operation of the auxiliary pump and the main pump. It is convenient to implement and has low modification cost.

[0049] 3. This application sets the high-efficiency operating range of the auxiliary pump and calculates the high-efficiency operating range of multiple pump sets, so that each pump can operate within the flow range of its high-efficiency operating range, thereby saving energy and avoiding inefficient operation of the pump.

[0050] 4. When selecting pump sets, if the combined high-efficiency operating flow range of multiple pump sets meets the current water supply requirements, this application further saves on losses by setting the selection of pump sets with lower total input power and fewer pumps.

[0051] 5. When the main pump models are the same, there may be multiple pump sets with the same combined high-efficiency operating flow range, total input power, and number of pumps. By further selecting a pump set combination that includes the pump with the shortest operating time in the most recent set statistical period, it is possible to avoid a certain main pump being idle.

[0052] 6. This application avoids high-frequency switching of pump unit combinations by setting stagnation intervals, avoids unnecessary switching, and reduces equipment damage and energy consumption caused by frequent start-stop.

[0053] Please continue reading. Figure 4 This embodiment provides an energy-saving control device 400 for a water pump unit, including: at least one processor 410; and, Memory 420 communicatively connected to at least one processor; wherein, The memory 420 stores instructions that can be executed by at least one processor 410. The instructions are executed by at least one processor 410 to enable the at least one processor 410 to perform the above-described energy-saving control method for the water pump unit. Figure 4 Take a processor 410 as an example.

[0054] In some embodiments, the processor 410 is used to acquire the total flow rate at the inlet and outlet of the water pump unit, the status parameters of each pump in the water pump unit, and historical water flow data; determine the current required water flow rate based on the total flow rate at the inlet and outlet of the water pump unit, the status parameters, and the historical water flow data; determine whether the current required water flow rate is within the water supply capacity range of the auxiliary pump; when the determination is yes, control the start of the auxiliary pump and supply water at a constant pressure with a first pressure value, the first pressure value being greater than the second pressure value preset by the main pump, so that the main pump reduces its frequency until it enters a dormant state, at which time the water pump unit is supplied with water only by the auxiliary pump; when the determination is no, control the start of the main pump and adjust the operating status of the auxiliary pump.

[0055] In some embodiments, the memory 420 serves as a non-volatile computer-readable storage medium, used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules of the water pump unit energy-saving control method in the embodiments of this application. The processor 410 executes various functional applications and data processing of the water pump unit energy-saving control device 400 by running the non-volatile software programs, instructions, and modules stored in the memory 420, thereby realizing the water pump unit energy-saving control method of the above-described method embodiments.

[0056] In some embodiments, memory 420 may include a program storage area and a data storage area, wherein the program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the pump unit energy-saving control device 400, etc. Furthermore, memory 420 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 420 may optionally include memory remotely located relative to processor 410, and this remote memory may be connected to the controller via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0057] In some implementations, one or more modules are stored in memory 420 and, when executed by one or more processors 410, perform the pump unit energy-saving control method described in any of the above method embodiments, for example, performing the above-described... Figure 1 The method steps S100 to S500.

[0058] In some implementations, the energy-saving control device for the pump unit can also be a chip, such as a data processing unit (DPU) chip used in a data center. Alternatively, the energy-saving control device for the pump unit can also be a network interface card that includes a chip and multiple interfaces (such as PCI / PCIE interface, UART interface, USB interface, etc.). Or, the energy-saving control device for the pump unit can also be a traditional server, or a server that includes a network interface card or chip. The server includes a host and a data processor. The data processor is used to schedule messages to the host or the data processor itself for processing. The host is used to process the messages scheduled by the data processor.

[0059] Please refer to point 5. Figure 5 This is a structural block diagram of a computer-readable storage medium provided in an embodiment of this application. The computer-readable storage medium 500 stores program code 510, which can be called by a processor to execute the water pump unit energy-saving control method described in the above method embodiments.

[0060] The computer-readable storage medium 500 may be an electronic storage device such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or ROM. Optionally, the computer-readable storage medium includes non-volatile computer-readable media. transitory computer The computer-readable storage medium 500 has storage space for program code that performs any of the method steps in the above-described energy-saving control method for the pump unit. This program code can be read from or written to one or more computer program products. The program code can be compressed, for example, in a suitable form.

[0061] In summary, this application provides an energy-saving control method for a water pump unit. This method includes: acquiring the total flow rate at the inlet and outlet of the water pump unit, the status parameters of each pump in the water pump unit, and historical water flow data; determining the current required water flow rate based on the total flow rate at the inlet and outlet of the water pump unit, the status parameters, and the historical water flow data; determining whether the current required water flow rate is within the water supply capacity range of the auxiliary pump; if yes, controlling the start of the auxiliary pump and supplying water at a constant pressure with a first pressure value greater than a preset second pressure value of the main pump, so that the main pump reduces its frequency until it enters a dormant state, at which point the water pump unit is supplied only by the auxiliary pump; if no, controlling the start of the main pump and adjusting the operating status of the auxiliary pump. Breaking away from the traditional approach of relying primarily on the main pump while the auxiliary pumps are underutilized or not operating, this method obtains the total water flow supplied by the pump unit and the status parameters of each pump. Based on the total flow, status parameters, and historical water flow data, it determines the current water supply demand. When it is determined that the current water supply demand can be met by the auxiliary pumps alone, the main pump can be forced to shut down and enter a dormant state by increasing its outlet pressure setpoint, thereby achieving energy savings. Furthermore, the method provided in this application can be integrated into existing systems without modifying the original control cabinet or interrupting water supply, controlling the operation of both the auxiliary and main pumps. It is convenient to implement and has low modification costs.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for energy-saving control of a water pump unit, characterized in that, The pump unit includes an auxiliary pump and at least one main pump, the auxiliary pump and the main pump being used for water supply, and the method steps include: Obtain the total flow rate at the inlet and outlet of the water pump unit, the status parameters of each pump in the water pump unit, and historical water flow data; Based on the total flow rate at the inlet and outlet of the water pump unit, the status parameters, and the historical water flow data, the required flow rate for the current water supply is determined. Determine whether the current required water flow rate is within the water supply capacity range of the auxiliary pump; When the determination is yes, the auxiliary pump is started and constant pressure water supply is provided at a first pressure value. The first pressure value is greater than the second pressure value preset by the main pump, so that the main pump reduces its frequency until it enters a dormant state. At this time, the water pump unit is only supplied with water by the auxiliary pump. If the determination is negative, the main pump is started and the operating status of the auxiliary pump is adjusted.

2. The energy-saving control method for water pump units according to claim 1, characterized in that, Based on the total flow rate at the inlet and outlet of the water pump unit, the status parameters, and the historical water flow data, the required flow rate for the current water supply is determined, including: Based on the historical water flow data, determine the initial predicted flow value; Based on the total flow rate at the inlet and outlet of the water pump unit and the status parameters, the initial predicted flow rate value is compensated, and the compensated flow rate value is the flow rate required for the current water supply. The water pump unit's inlet is connected to the water supply source, and the water pump unit's outlet is connected to the user's water supply network.

3. The energy-saving control method for water pump units according to claim 1, characterized in that, When it is determined that the current required water flow rate is within the water supply capacity range of the auxiliary pump, the auxiliary pump is started and constant pressure water supply is provided at the first pressure value. If the determination is negative, the main pump is started and the operating status of the auxiliary pump is adjusted. Each pump operates within its high-efficiency operating range, and the operating efficiency corresponding to its flow rate is not lower than a preset threshold.

4. The energy-saving control method for water pump units according to claim 3, characterized in that, The pump unit includes an auxiliary pump and a main pump. When the condition is not met, the main pump is started, and the operating status of the auxiliary pump is adjusted. Each pump operates within its high-efficiency operating range, and the operating efficiency corresponding to its flow rate is not lower than a preset threshold, including: When the current required water supply flow rate is within the high-efficiency operating range of the main pump, the auxiliary pump is stopped and the main pump is put into operation. When the current water supply required exceeds the high-efficiency operating range of the main pump, but is within the combined high-efficiency operating range of the main pump and the auxiliary pump, the main pump and the auxiliary pump are controlled to operate together.

5. The energy-saving control method for a water pump unit according to claim 3, characterized in that, The pump unit includes one auxiliary pump and at least two main pumps. When the condition is not met, the main pumps are started, and the operating status of the auxiliary pumps is adjusted. Each pump operates within its high-efficiency operating range, and the operating efficiency corresponding to its flow rate is not lower than a preset threshold, including: Obtain the combined high-efficiency operating flow range corresponding to each pump group combination of the one auxiliary pump and multiple main pumps; The required flow rate for the current water supply is matched with the combined high-efficiency operating flow rate range corresponding to each pump group combination, and the corresponding pump group combination is selected to control the start or stop of the main pump and the auxiliary pump.

6. The energy-saving control method for a water pump unit according to claim 5, characterized in that, The method further includes: when the current water supply required flow falls within the combined high-efficiency operating flow range of the multiple pump group combinations, obtaining the total input power of the multiple pump group combinations, and selecting the pump group combination with the lowest total input power; When there are multiple pump group combinations with the lowest total input power, select the pump group combination with the fewest operating pumps. When there are multiple pump group combinations with the lowest total input power and the same number of operating pumps, they are selected according to a preset priority order.

7. The energy-saving control method for a water pump unit according to claim 6, characterized in that, When multiple pump group combinations exist with the lowest total input power and the same number of operating pumps, they are selected according to a preset priority order, including: The method for setting the preset priority order is as follows: Obtain the running time of each of the main pumps and the auxiliary pumps within the most recent set statistical period, and select the pump group combination that includes the pump with the shortest running time within the most recent set statistical period. If there are multiple pump group combinations, further select the pump group combination that includes the pump with the second shortest running time in the most recent set statistical period, and so on, until a unique combination is selected. If no single combination can be selected, a pump set combination will be selected from the remaining pump set combinations according to a preset fixed priority order.

8. The energy-saving control method for a water pump unit according to claim 5, characterized in that, Obtain the combined high-efficiency operating flow range corresponding to each pump set combination of the one auxiliary pump and multiple main pumps, including: The method for determining the combined high-efficiency operation flow range is as follows: Based on the performance curves of each main pump and the auxiliary pump, a composite flow rate and head relationship curve is determined for each pump combination; wherein the performance curve includes the relationship curve between the flow rate and the head provided by each pump, and the head is the work done by each pump on a unit weight of water flow; the performance curve also includes the relationship curve between the flow rate and the operating efficiency of each pump. When multiple pumps of each pump set are connected in parallel, the head of each pump is equal, the head of each pump is the total head, and the total flow rate of each pump set is the sum of the flow rates of each pump in the pump set at that head. Based on the relationship curve between the flow rate and the head provided by each pump in the pump set, the discrete value of each pump within the predetermined head range is obtained. The discrete values ​​of each pump in the pump set are superimposed to obtain the relationship curve between the combined flow rate and the total head of the pump set. For each operating point of the relationship curve between the combined flow rate and the total head of the pump set combination, each operating point corresponds to a total head value. Based on the relationship curve between the flow rate and the head provided by each pump and the total head value, the flow rate value of each pump in the pump set combination is determined. Based on the relationship curve between the flow rate and operating efficiency of each pump and the flow rate value of each pump, the operating efficiency of each pump is determined, and the total operating efficiency of the pump set combination at the operating point is calculated to generate the relationship curve between the combined flow rate and total efficiency of the pump set combination. This determines the combined high-efficiency operating flow rate range for each pump set combination. The combined high-efficiency operating flow rate range is the range of combined flow rates on the relationship curve between the combined flow rate and total efficiency of the pump set combination where the total efficiency is not lower than a set threshold.

9. The energy-saving control method for a water pump unit according to claim 5, characterized in that, Match the current water supply required flow rate with the combined high-efficiency operation flow rate range corresponding to each pump group combination, select the corresponding pump group combination, and control the start or stop of the main pump and the auxiliary pump, including: the switching of the pump group combination is set with a stagnation range, the stagnation range is based on the predicted flow rate value when the pump group combination was switched last time, with the threshold increased or decreased. When the current water supply demand is within the stagnant range, the current pump set operation status remains unchanged until the demand change exceeds the stagnant range before a switching operation can be performed.

10. The energy-saving control method for a water pump unit according to claim 2, characterized in that, The status parameters include one or more of the following for each pump in the pump unit: pressure, current, voltage, power, and speed.

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