Method, apparatus, and computer equipment for condition monitoring of electric direct-drive pumps based on pump efficiency.

Abstract

This manual relates to the field of pump fault detection technology, and in particular to a method, device, and computer equipment for monitoring the condition of an electric direct-drive pump based on pump efficiency. It acquires the operating parameters of the target pump and the working parameters of the motor driving the pump. The operating parameters include: outlet pressure, inlet pressure, and operating flow rate. Based on the outlet pressure, inlet pressure, and operating flow rate, the output power of the target pump is determined. Based on the motor's working parameters, the transmission efficiency from the motor to the main shaft is determined. Based on the transmission efficiency, the average efficiency of the motor, and the input power of the motor, the input power of the target pump is determined. Based on the output power and input power, the pump efficiency is determined. Based on the pump efficiency and a preset threshold, the target pump is monitored to determine whether it is in normal working condition. This manual determines the pump efficiency of the target pump based on the operating parameters of the electric direct-drive pump and determines whether preset operations need to be performed on the target pump; it overcomes the technical problems of frequent disassembly and inspection of the pump by on-site personnel, resulting in a large workload and high construction risks.

Description

Technical Field

[0001] This manual relates to the field of pump fault detection technology, and in particular to methods, devices and computer equipment for monitoring the condition of electric direct-drive pumps based on pump efficiency. Background Technology

[0002] Pumps, as one of the most commonly used mechanical devices, are widely used in various fields such as petroleum and petrochemicals, non-ferrous metal smelting, power generation, and agriculture. Taking petroleum and petrochemical plants as an example, rotating equipment (pumps, motors, fans, gearboxes, etc.) accounts for more than 80% of their equipment usage. With such a large number of devices in use, ensuring the safe, long-term, and stable operation of pumps and other equipment is extremely important.

[0003] Routine maintenance of pumps and motors is usually carried out when the pumps or motors malfunction or fail. If the cause of the failure could be known before it occurs, the efficiency of equipment maintenance would be greatly improved. In the current technology, if a pump or motor failure is found, on-site personnel need to frequently disassemble and inspect the pump components. Problems with the pump components can lead to abnormal termination of operations, resulting in a large workload, low work efficiency, and significant construction risks.

[0004] Instruction manual content

[0005] To address the problems of low efficiency and high risk associated with manually disassembling pumps for fault inspection in the prior art, this specification provides a method, apparatus, and computer equipment for monitoring the condition of electric direct-drive pumps based on pump efficiency.

[0006] This specification provides an embodiment of a method for monitoring the status of an electric direct-drive pump based on pump efficiency, comprising: acquiring the operating parameters of a target pump and the operating parameters of the motor driving the pump, wherein the operating parameters include: outlet pressure, inlet pressure, and operating flow rate; determining the output power of the target pump based on the outlet pressure, inlet pressure, and operating flow rate; determining the transmission efficiency from the motor to the spindle based on the operating parameters of the motor driving the pump; determining the input power of the target pump based on the transmission efficiency, the average efficiency of the motor, and the input power of the motor; determining the pump efficiency of the target pump based on the output power and the input power; and monitoring whether the target pump is in normal operating condition based on the pump efficiency and a preset threshold.

[0007] According to one aspect of an embodiment of this specification, the method includes: determining the transmission efficiency from the motor to the spindle according to the following formula: Among them, P e η represents the rated power of the motor; β represents the load rate of the motor; ΔP0 represents the no-load loss of the motor; η represents the rated power of the motor. e The average efficiency of the electric motor is a known quantity. Based on the transmission efficiency, the input power of the target pump is determined using the following formula: P Rs =Pei ·η e ·η t Among them, P Rs η represents the input power of the target pump. t Indicates the transmission efficiency from the motor to the spindle; η e P represents the average efficiency of the electric motor, which is a known quantity; ei P represents the input power of the electric motor. Rs This indicates the pump's input power.

[0008] According to one aspect of an embodiment of this specification, the load rate of the motor is determined as follows: the motor load rate is determined based on the motor operating current, the motor rated current, and the motor no-load current. Where β represents the motor load factor, and I represents the motor operating current; I e I0 represents the rated current of the motor; I0 represents the no-load current of the motor.

[0009] According to one aspect of an embodiment of this specification, the no-load loss of the motor is determined by the following formula:

[0010] Where ΔP0 represents the no-load loss of the motor, and the no-load loss of the motor is the fixed loss of the motor, P e η is the rated power of the motor, β is the load rate of the motor, and η is the rated power of the motor. e This indicates the average efficiency of the motor.

[0011] According to one aspect of the embodiments of this specification, determining pump efficiency includes: determining pump efficiency based on the ratio of the pump's input power to the pump's output power.

[0012] According to one aspect of an embodiment of this specification, the method further includes: correcting the collected operating flow rate using a flow coefficient.

[0013] This specification provides an embodiment of an electric direct-drive pump status monitoring device based on pump efficiency. The device includes: a parameter acquisition unit for acquiring the operating parameters of the target pump and the working parameters of the pump-driven motor, wherein the operating parameters include: outlet pressure, inlet pressure, and operating flow rate; an output power determination unit for determining the output power of the target pump based on the outlet pressure, inlet pressure, and operating flow rate; an input power determination unit for determining the transmission efficiency from the motor to the spindle based on the working parameters of the pump-driven motor; an input power determination unit for determining the input power of the target pump based on the transmission efficiency, the average efficiency of the motor, and the input power of the motor; a pump efficiency determination unit for determining the pump efficiency of the target pump based on the output power and input power; and a monitoring unit for monitoring whether the target pump is in normal working condition based on the pump efficiency and a preset threshold.

[0014] This specification provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method for monitoring the state of an electric direct-drive pump based on pump efficiency.

[0015] This specification also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method for monitoring the state of an electric direct-drive pump based on pump efficiency.

[0016] This manual is based on an electric direct-drive pump. By determining the pump efficiency of the target pump according to the operating parameter information, it can ultimately determine whether the target pump needs to perform preset operations. This automatically determines whether the target pump needs to perform preset operations. It overcomes the technical problems of existing technologies that require frequent disassembly and inspection of the pump by on-site personnel, which results in a large workload and high construction risks. Attached Figure Description

[0017] To more clearly illustrate the technical specifications in the embodiments or prior art of this specification, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 The diagram shown is a flowchart of a method for monitoring the condition of an electric direct-drive pump based on pump efficiency, according to an embodiment of this specification.

[0019] Figure 2 The diagram shown is a flowchart of a method for determining the input efficiency of a target pump according to an embodiment of this specification.

[0020] Figure 3 The diagram shown is a flowchart of a method for determining the no-load loss of an electric motor according to an embodiment of this specification.

[0021] Figure 4 The diagram shown is a structural schematic of an electric direct-drive pump condition monitoring device based on pump efficiency, according to an embodiment of this specification.

[0022] Figure 5 The diagram shown is a schematic representation of the specific structure of the electric direct-drive pump status monitoring device based on pump efficiency in this embodiment.

[0023] Figure 6 The diagram shown is a structural schematic of a computer device according to an embodiment of this specification.

[0024] Explanation of symbols in the attached drawings:

[0025] 401. Parameter Acquisition Unit;

[0026] 4011, Flow Correction Module;

[0027] 402. Output power determination unit;

[0028] 403. Transmission efficiency determination unit;

[0029] 4031. Motor parameter acquisition module;

[0030] 404. Input power determination unit;

[0031] 405. Pump efficiency determination unit;

[0032] 406. Monitoring Unit;

[0033] 602. Computer equipment;

[0034] 604, Processor;

[0035] 606. Memory;

[0036] 608. Drive mechanism;

[0037] 610. Input / output module;

[0038] 612. Input devices;

[0039] 614. Output devices;

[0040] 616. Presentation equipment;

[0041] 618. Graphical User Interface;

[0042] 620. Network interface;

[0043] 622. Communication link;

[0044] 624. Communication bus. Detailed Implementation

[0045] To enable those skilled in the art to better understand the technical specifications herein, the technical specifications of the embodiments herein will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments herein without creative effort are within the scope of protection of this specification.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, apparatus, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0047] This specification provides the operational steps of the methods described in the embodiments or flowcharts, but based on conventional or non-inventive labor, more or fewer operational steps may be included. The order of steps listed in the embodiments is merely one possible execution order among many and does not represent the only possible execution order. In actual system or device products, the methods shown in the embodiments or drawings can be executed sequentially or in parallel.

[0048] It should be noted that the pump efficiency-based electric direct-drive pump condition monitoring method in this specification can be used in the field of pump fault detection technology and also in the field of oil and gas field exploration. This specification does not limit the application field of the pump efficiency-based electric direct-drive pump condition monitoring method and device.

[0049] Figure 1 The diagram shown is a flowchart of a method for monitoring the condition of an electric direct-drive pump based on pump efficiency, according to an embodiment of this specification. The method specifically includes the following steps:

[0050] Step 101: Obtain the operating parameters of the target pump and the working parameters of the motor connected to the pump. The operating parameters include: outlet pressure, inlet pressure, and operating flow rate. In some embodiments of this specification, the operating parameters of the target pump are obtained through sensors installed on the target pump. Specifically, the operating flow rate of the target pump is collected using a flow sensor on the target pump; the inlet pressure and outlet pressure of the target pump are collected using a pressure sensor on the target pump, thereby obtaining the operating parameters of the target pump. In this step, in addition to collecting the operating parameters of the target pump, the working parameters of the motor connected to the pump are also obtained, where the motor is the motor connected to the target pump.

[0051] In the embodiments described in this specification, the suction and discharge valves of the target pump generally cannot close in a timely manner during actual operation. There may be leakage of high-pressure liquid at pump valves, pistons, and other seals. The presence of gas in the pump cylinder or liquid, reducing the suction fill, or poor suction conditions, may cause the actual average flow rate of the reciprocating pump to be lower than expected; therefore, the measured flow rate needs to be corrected.

[0052] In this manual, the operating flow rate is corrected using a flow rate correction formula: G SR = K·Q; where K represents the flow coefficient and Q represents the collected operating flow rate. The flow coefficient reflects the magnitude of leakage loss within the target pump and is generally obtained through field measurement, typically between 0.85 and 0.95.

[0053] Step 102: Determine the output power of the target pump based on the outlet pressure, inlet pressure, and operating flow rate. In this step, the operating parameters of the pump motor include: rated power of the motor, load power of the motor, no-load loss of the motor, and rated power of the motor. This step also includes preprocessing the collected operating parameters of the target pump and estimating the output power of the target pump.

[0054] In this step, the target pump's output power is obtained by multiplying the difference between the outlet and inlet pressures by the operating flow rate, and then dividing by the unit conversion factor. The specific formula is as follows:

[0055] P Ru =(P SRout -P SRin )·G SR / α; where P Ru This indicates output power, measured in kW; P SRout P represents the outlet pressure of the target pump, in MPa. SRin The inlet pressure of the target pump is expressed in MPa; α is the unit conversion factor.

[0056] Step 103: Determine the transmission efficiency from the motor to the spindle based on the operating parameters of the pump-driven motor. In this embodiment, the transmission efficiency from the motor to the spindle is calculated based on the motor's no-load loss, rated power, load rate, and rated power. For details on the calculation formula for the transmission efficiency in this step, please refer to [link to relevant documentation]. Figure 2 describe.

[0057] Step 104: Determine the input power of the target pump based on the transmission efficiency, the average efficiency of the motor, and the input power of the motor.

[0058] In this step, the pump's input power is the product of the motor's input power, the motor's average efficiency, and the transmission efficiency. See details... Figure 2 describe.

[0059] Step 105: Determine the pump efficiency of the target pump based on the output power and input power. In this step, the pump efficiency of the target pump is the ratio of the pump's output power to its input power.

[0060] Step 106: Monitor whether the target pump is in normal working condition based on pump efficiency and a preset threshold. In this step, by observing the changes in pump efficiency during the normal operation of the electric direct-drive pump, the pump efficiency is compared with a preset threshold to determine the status of the electric direct-drive pump, and abnormal operation can be detected in a timely manner to take corresponding measures. Specifically, based on real-time monitoring of the target pump's status, when the pump efficiency is less than or equal to the preset threshold, it is determined that the pump's working condition is abnormal. Remote diagnostic experts and engineering management departments can perform remote data analysis and fault diagnosis on all monitored equipment.

[0061] In some embodiments of this specification, this step can be executed by the alarm system of the online monitoring system for the electric direct-drive pump. The alarm system includes an audible and visual alarm device and a signal transmitting device connected to a host computer. Upon receiving a fault, the processor issues an action command, triggering an audible alarm and a red light alarm, while the GSM module sends an alarm SMS to the duty mobile phone. Thus, substation operators can easily detect abnormal pump operation during inspections or after receiving the SMS and immediately take appropriate action, achieving online monitoring.

[0062] This manual is based on an electric direct-drive pump. By determining the pump efficiency of the target pump according to the operating parameter information, it can ultimately determine whether the target pump needs to perform preset operations. This automatically determines whether the target pump needs to perform preset operations. It overcomes the technical problems of existing technologies that require frequent disassembly and inspection of the pump by on-site personnel, which results in a large workload and high construction risks.

[0063] Figure 2 The diagram shown is a flowchart of a method for determining the input efficiency of a target pump according to an embodiment of this specification, which specifically includes the following steps:

[0064] Step 201: Determine the transmission efficiency from the motor to the spindle. Specifically, determine the transmission efficiency from the motor to the spindle using the following formula:

[0065] Among them, P e η represents the rated power of the motor; β represents the load rate of the motor; ΔP0 represents the no-load loss of the motor; η represents the rated power of the motor. e This represents the average efficiency of the electric motor, which is a known quantity.

[0066] Step 202: Determine the input power of the target pump based on the transmission efficiency. Specifically, this is determined using the following formula:

[0067] P Rs =P ei ·η e ·η t ;

[0068] Among them, P Rsη represents the input power of the target pump. t Indicates the transmission efficiency from the motor to the spindle; η e P represents the average efficiency of the electric motor, which is a known quantity; ei P represents the input power of the electric motor. Rs This indicates the pump's input power.

[0069] In the embodiments of this specification, the load rate of the motor is determined as follows: the motor load rate is determined based on the motor operating current, the motor rated current, and the motor no-load current:

[0070] Where β represents the motor load factor, and I represents the motor operating current; I e I0 represents the rated current of the motor; I0 represents the no-load current of the motor.

[0071] Figure 3 The diagram shown is a flowchart of a method for determining the no-load loss of an electric motor according to an embodiment of this specification, which specifically includes the following steps:

[0072] Step 301: Determine the motor losses at rated load based on the motor's rated power and average efficiency. In this embodiment, the motor's rated power is denoted as P. e Let the average efficiency of the electric motor be denoted as η. e The motor losses under rated load conditions are determined using the following formula:

[0073] Wherein, ΔP e Indicates the motor loss under rated load conditions; η e This represents the average efficiency of the electric motor, which can be obtained from the nameplate or manufacturer's label. P e This indicates the rated power of the motor, which can be obtained from the nameplate or the manufacturer.

[0074] Step 302: Determine the no-load loss of the motor based on the motor's load rate, average motor efficiency, and input power of the motor with pump.

[0075] In this step, the no-load loss of the motor is determined using the following formula:

[0076]

[0077] Where ΔP0 represents the no-load loss of the motor, and the no-load loss of the motor is the fixed loss of the motor, P e η is the rated power of the motor, β is the load rate of the motor, and η is the rated power of the motor. e This indicates the average efficiency of the motor.

[0078] In the embodiments of this specification, after calculating the transmission efficiency from the motor to the spindle, the expression for the transmission efficiency is further substituted into the input power calculation formula of the target pump, and the input power of the target pump is calculated according to the following formula:

[0079]

[0080] Furthermore, by substituting the calculated input power of the target pump into the pump efficiency calculation formula, the efficiency of the target pump is obtained:

[0081]

[0082] Where, η S P represents the efficiency of the target pump. Ru The output power of the target pump is represented by K, the flow coefficient is represented by G. SR Indicates the operating flow rate of the target pump; η e P represents the average efficiency of the electric motor. SRout P represents the output power of the target pump. SRin P represents the inlet pressure of the target pump, β represents the load rate of the electric motor; e ΔP0 represents the rated power of the motor; ΔP0 represents the no-load loss of the motor.

[0083] like Figure 4 The diagram shown is a structural schematic of an electric direct-drive pump condition monitoring device based on pump efficiency, according to an embodiment of this specification. The basic structure of the device is illustrated in the diagram. The functional units and modules can be implemented in software, or using general-purpose or specific chips to implement the pump efficiency-based electric direct-drive pump condition monitoring. The device specifically includes:

[0084] The parameter acquisition unit 401 is used to acquire the operating parameters of the target pump and the working parameters of the pump motor, wherein the operating parameters include: outlet pressure, inlet pressure, and operating flow rate;

[0085] The output power determination unit 402 is used to determine the output power of the target pump based on the outlet pressure, inlet pressure and operating flow rate.

[0086] The transmission efficiency determination unit 403 is used to determine the transmission efficiency from the motor to the main shaft based on the operating parameters of the pump motor.

[0087] The input power determination unit 404 is used to determine the input power of the target pump based on the operating parameters of the pump motor.

[0088] Pump efficiency determination unit 405 is used to determine the pump efficiency of the target pump based on the output power and input power;

[0089] The monitoring unit 406 is used to monitor whether the target pump is in normal working condition based on pump efficiency and preset threshold.

[0090] This manual describes how to collect relevant signals and collect statistical information when the pump is operating, enabling online monitoring of the target pump efficiency. This allows substation maintenance personnel to conduct intuitive inspections during routine patrols without additional operation. Furthermore, this manual integrates existing data, and the database stores data in a structure consistent with the daily workflow of substation operation, facilitating data maintenance and retrieval. By employing a management and maintenance system, when a fault occurs again, the system automatically matches the most similar fault scenarios for reference by personnel to quickly locate the problem.

[0091] This manual, based on electric direct-drive pumps, determines the pump efficiency of the target pump according to operating parameter information, and ultimately determines whether preset operations need to be performed on the target pump. It automatically determines whether the target pump needs to perform preset operations, eliminating the need for on-site manual inspection and avoiding maintenance, upkeep, or replacement of the pump only after problems occur. It effectively overcomes the technical problems of related technologies that require frequent on-site disassembly and inspection of the pump, and that pump problems can lead to abnormal termination of operations, resulting in a large workload and high construction risks.

[0092] As one embodiment of this specification, reference may also be made to, for example, Figure 5 The diagram shown is a schematic representation of the specific structure of the electric direct-drive pump status monitoring device based on pump efficiency in this embodiment.

[0093] As an embodiment of this specification, the parameter acquisition unit 401 further includes: a flow correction module 4011, used to correct the collected operating flow using a flow coefficient;

[0094] As an embodiment of this specification, the transmission efficiency determination unit 403 further includes: a motor parameter acquisition module 4031, used to acquire the rated power of the motor, the no-load loss of the motor, and the average efficiency of the motor.

[0095] like Figure 6As shown in the illustration, a computer device provided in an embodiment of this specification is described. The method for monitoring the status of an electric direct-drive pump based on pump efficiency can be executed by the computer device 602. The computer device 602 may include one or more processors 604, such as one or more central processing units (CPUs), each of which can implement one or more hardware threads. The computer device 602 may also include any memory 606 for storing information of any kind, such as code, settings, data, etc. Without limitation, for example, the memory 606 may include any type of RAM, any type of ROM, flash memory, hard disk, optical disk, etc. More generally, any memory can use any technology to store information. Further, any memory can provide volatile or non-volatile retention of information. Further, any memory can represent a fixed or removable component of the computer device 602. In one case, when the processor 604 executes associated instructions stored in any memory or combination of memories, the computer device 602 can perform any operation of the associated instructions. The computer device 602 also includes one or more drive mechanisms 608 for interacting with any memory, such as hard disk drive mechanisms, optical disk drive mechanisms, etc.

[0096] Computer device 602 may also include an input / output module 610 (I / O) for receiving various inputs (via input device 612) and providing various outputs (via output device 614). A specific output mechanism may include a presentation device 616 and an associated graphical user interface (GUI) 618. In other embodiments, the input / output module 610 (I / O), input device 612, and output device 614 may be omitted, and the device may function solely as a computer device within a network. Computer device 602 may also include one or more network interfaces 620 for exchanging data with other devices via one or more communication links 622. One or more communication buses 624 couple the components described above together.

[0097] Communication link 622 can be implemented in any way, such as via a local area network, a wide area network (e.g., the Internet), a point-to-point connection, or any combination thereof. Communication link 622 may include any combination of hardwired links, wireless links, routers, gateway functions, name servers, etc., governed by any protocol or combination of protocols.

[0098] Corresponding to Figures 1 to 4 In addition to the methods described above, embodiments of this specification also provide a computer-readable storage medium storing a computer program that, when executed by a processor, performs the steps of the methods described above.

[0099] This specification also provides computer-readable instructions, wherein when a processor executes the instructions, the program therein causes the processor to perform the following... Figures 1 to 4 The method shown.

[0100] It should be understood that in the various embodiments of this specification, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this specification.

[0101] It should also be understood that, in the embodiments of this specification, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this specification generally indicates that the preceding and following related objects have an "or" relationship.

[0102] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed in this specification can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of this specification. Those skilled in the art can implement the described functions using different methods for each specific application, but such implementations should not be considered beyond the scope of this specification.

[0103] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0104] In the several embodiments provided in this specification, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the couplings or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through some interfaces, devices, or units, or they may be electrical, mechanical, or other forms of connection.

[0105] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this specification's embodiments, depending on actual needs.

[0106] Furthermore, the functional units in the various embodiments of this specification can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0107] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical specification of this manual, or the part that contributes to the prior art, or all or part of the technical specification, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this manual. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0108] This specification uses specific embodiments to illustrate the principles and implementation methods of this specification. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this specification. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this specification. Therefore, the content of this specification should not be construed as a limitation of this specification.

Claims

1. A method for monitoring the condition of an electric direct-drive pump based on pump efficiency, characterized in that, The method includes: Obtain the operating parameters of the target pump and the operating parameters of the pump motor, wherein the operating parameters include: outlet pressure, inlet pressure, and operating flow rate; The output power of the target pump is determined based on the outlet pressure, inlet pressure, and operating flow rate. Based on the operating parameters of the pump-driven motor, the transmission efficiency from the motor to the spindle is determined, including: determining the transmission efficiency from the motor to the spindle according to the following formula: ;in, Indicates the rated power of the electric motor; Indicates the load rate of the electric motor; This indicates the no-load loss of the electric motor; The average efficiency of the electric motor is a known quantity. The input power of the target pump is determined based on the transmission efficiency, the average efficiency of the motor, and the input power of the motor, including: determining the input power of the target pump using the following formula: ； in, Indicates the input power of the target pump. This indicates the transmission efficiency from the motor to the spindle; The average efficiency of the electric motor is a known quantity. This indicates the input power of the electric motor; Indicates the pump's input power; Based on the output power and input power, determine the pump efficiency of the target pump; Based on pump efficiency and preset thresholds, monitor whether the target pump is in normal working condition.

2. The method for monitoring the condition of an electric direct-drive pump based on pump efficiency according to claim 1, characterized in that, The load rate of the motor is determined in the following way: Determine the motor load factor based on the motor's operating current, rated current, and no-load current: ;in, This indicates the load factor of the motor, and I represents the operating current of the motor. Indicates the rated current of the motor; This indicates the no-load current of the motor.

3. The method for monitoring the condition of an electric direct-drive pump based on pump efficiency according to claim 2, characterized in that, The no-load loss of the motor is determined in the following way: According to the rated power of the motor Average efficiency of electric motor Determine the motor losses under rated load. ; Based on the motor load rate Average efficiency of electric motor Input power of the motor with pump Determine the no-load loss of the motor .

4. The method for monitoring the condition of an electric direct-drive pump based on pump efficiency according to claim 3, characterized in that, The no-load loss of the motor is determined by the following formula: ； in, This represents the no-load loss of the electric motor, where the no-load loss is the fixed loss of the electric motor. This refers to the rated power of the electric motor. The load rate of the motor. This indicates the average efficiency of the motor.

5. The method for monitoring the condition of an electric direct-drive pump based on pump efficiency according to claim 4, characterized in that, Determining pump efficiency includes: Pump efficiency is determined by the ratio of pump input power to pump output power.

6. The method for monitoring the condition of an electric direct-drive pump based on pump efficiency according to claim 1, characterized in that, The method further includes: The collected operating flow rate is corrected using the flow rate coefficient.

7. A condition monitoring device for an electric direct-drive pump based on pump efficiency, characterized in that, The apparatus applies the method of any one of claims 1 to 6, comprising: The parameter acquisition unit is used to acquire the operating parameters of the target pump and the working parameters of the pump motor, wherein the operating parameters include: outlet pressure, inlet pressure, and operating flow rate; The output power determination unit is used to determine the output power of the target pump based on the outlet pressure, inlet pressure, and operating flow rate. The transmission efficiency determination unit is used to determine the transmission efficiency from the motor to the main shaft based on the operating parameters of the pump motor. The input power determination unit is used to determine the input power of the target pump based on the transmission efficiency, the average efficiency of the motor, and the input power of the motor. A pump efficiency determination unit is used to determine the pump efficiency of the target pump based on the output power and input power. The monitoring unit is used to monitor whether the target pump is in normal working condition based on pump efficiency and preset thresholds.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method according to any one of claims 1 to 6.

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