Electric direct drive pump state monitoring method and device based on pump efficiency and computer equipment

Abstract

The invention relates to the technical field of pump fault detection, in particular to an electric direct drive pump state monitoring method and device based on pump efficiency and computer equipment. Operating parameters of a target pump and working parameters of a motor with a pump are obtained, and the operating parameters comprise outlet pressure, inlet pressure and operating flow; according to the outlet pressure, the inlet pressure and the operation flow, the output power of the target pump is determined; determining the transmission efficiency from the motor to the main shaft according to the working parameters of the motor; determining the input power of the target pump according to the transmission efficiency, the average efficiency of the motor and the input power of the motor; determining the pump efficiency according to the output power and the input power; and monitoring whether the target pump is in a normal working state or not according to the pump efficiency and a preset threshold value. According to the method, the pump efficiency of the target pump is determined based on the electric direct-drive pump operation parameters, and whether preset operation needs to be executed on the target pump is determined; the technical problems that on-site personnel frequently disassemble and check the pump, the working amount of the personnel is large, and the construction risk is large are solved.

Description

Technical Field

[0001] The present specification relates to the technical field of pump fault detection, and in particular to a method, device and computer equipment for monitoring the state of an electric direct-drive pump based on pump efficiency. Background Art

[0002] As one of the commonly used mechanical equipment, pumps have been widely used in various fields such as petroleum and petrochemical, nonferrous metallurgy, electricity, agriculture, etc. Taking petroleum and petrochemical plants as an example, the use of rotating equipment (pumps, motors, fans, gear boxes, etc.) is as high as more than 80%. With such a large number of equipment in use, it is very important to ensure the safe, long-term and stable operation of pump equipment.

[0003] Routine maintenance of pump equipment is usually carried out when the pump is operating abnormally or the equipment fails. If the cause of the equipment failure can be known before the equipment fails, the equipment maintenance efficiency will be greatly improved. In the prior art, if a pump equipment failure is found, on-site personnel are required to frequently disassemble and inspect the pump components. If a problem occurs in the pump components, the operation will be terminated abnormally, which requires a large amount of work, low work efficiency, and high construction risks.

[0004] Instruction Manual

[0005] In order to solve the problems of low efficiency and high risk in the above-mentioned prior art of manually disassembling the pump to check for faults, the embodiments of this specification provide a method, device and computer equipment for monitoring the state of an electric direct-drive pump based on pump efficiency.

[0006] The embodiments of the present specification provide a method for monitoring the state of an electric direct-drive pump based on pump efficiency, including: obtaining operating parameters of a target pump and operating parameters of a motor with a pump, wherein the operating parameters include: outlet pressure, inlet pressure, and operating flow; determining the output power of the target pump according to the outlet pressure, inlet pressure, and operating flow; determining the transmission efficiency from the motor to the main shaft according to the operating parameters of the motor with a pump; determining the input power of the target pump according to the transmission efficiency, the average efficiency of the motor, and the input power of the motor; determining the pump efficiency of the target pump according to the output power and the input power; and monitoring whether the target pump is in a normal working state according to 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 main shaft according to the following formula: Among them, P e 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 e represents the average efficiency of the motor, which is a known quantity; according to 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 represents the input power of the target pump, η t Indicates the transmission efficiency from the motor to the spindle; η e Represents the average efficiency of the motor, which is a known quantity; P ei Indicates the input power of the motor; P Rs Indicates the input power of the pump.

[0008] According to one aspect of the embodiment of this specification, the load rate of the motor is determined by the following method: the load rate of the motor is determined according to the running current of the motor, the rated current of the motor, and the no-load current of the motor: Among them, β represents the load rate of the motor, I represents the running current of the motor; I e Indicates the rated current of the motor; I0 indicates the no-load current of the motor.

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

[0010] Among them, ΔP0 represents the no-load loss of the motor, where the no-load loss of the motor is the fixed loss of the motor, P e is the rated power of the motor, β is the load rate of the motor, η e Indicates the average efficiency of the motor.

[0011] According to one aspect of an embodiment of the present specification, determining the pump efficiency includes: determining the pump efficiency according to a ratio of the input power of the pump to the output power of the pump.

[0012] According to one aspect of the embodiments of the present specification, the method further includes: using a flow coefficient to correct the collected operating flow.

[0013] The embodiment of the present specification provides an electric direct-drive pump state monitoring device based on pump efficiency, and the device includes: a parameter acquisition unit, used to acquire the operating parameters of the target pump and the operating parameters of the motor with the pump, wherein the operating parameters include: outlet pressure, inlet pressure, and operating flow; an output power determination unit, used to determine the output power of the target pump according to the outlet pressure, inlet pressure, and operating flow; an input power determination unit, used to determine the transmission efficiency of the motor to the main shaft according to the operating parameters of the motor with the pump; an input power determination unit, used to determine the input power of the target pump according to the transmission efficiency, the average efficiency of the motor, and the input power of the motor; a pump efficiency determination unit, used to determine the pump efficiency of the target pump according to the output power and the input power; a monitoring unit, used to monitor whether the target pump is in a normal working state according to the pump efficiency and a preset threshold.

[0014] An embodiment of the present specification provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the pump efficiency-based electric direct-drive pump state monitoring method when executing the computer program.

[0015] The embodiments of the present specification also provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the electric direct-drive pump state monitoring method based on pump efficiency is implemented.

[0016] This manual is based on the electric direct-drive pump. By determining the pump efficiency of the target pump according to the operating parameter information, it finally determines whether it is necessary to perform a preset operation on the target pump, thereby automatically judging whether the target pump needs to implement the preset operation; it overcomes the technical problems of the prior art that on-site personnel need to frequently disassemble and inspect the pump, which results in a large workload and high construction risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of this specification or the technical specifications in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a flow chart of a method for monitoring the state of an electric direct-drive pump based on pump efficiency according to an embodiment of this specification;

[0019] Figure 2 Shown is a flow chart of a method for determining the input efficiency of a target pump according to an embodiment of this specification;

[0020] Figure 3 The figure is a flow chart of a method for determining no-load loss of a motor according to an embodiment of the present specification;

[0021] Figure 4 The figure shows a schematic diagram of the structure of a pump efficiency-based electric direct-drive pump state monitoring device according to an embodiment of the present specification;

[0022] Figure 5 The figure shows a specific structural schematic diagram of the electric direct-drive pump state monitoring device based on pump efficiency according to this embodiment;

[0023] Figure 6 The figure shows a schematic diagram of the structure of a computer device according to an embodiment of the present specification.

[0024] Description of the accompanying symbols:

[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, driving mechanism;

[0037] 610, input / output module;

[0038] 612. Input devices;

[0039] 614. Output device;

[0040] 616. Presentation equipment;

[0041] 618. Graphical user interface;

[0042] 620, network interface;

[0043] 622, communication link;

[0044] 624. Communication bus. DETAILED DESCRIPTION

[0045] In order to enable those skilled in the art to better understand the technical specifications in this specification, the technical specifications in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this specification.

[0046] It should be noted that the terms "first", "second", etc. in the description and claims of this specification and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of this specification described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0047] This specification provides method operation steps as described in the embodiments or flow charts, but more or fewer operation steps may be included based on routine or non-creative work. The order of steps listed in the embodiments is only one way of executing the order of many steps and does not represent the only execution order. When the system or device product is executed in practice, it can be executed in the order of the method shown in the embodiments or the drawings or in parallel.

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

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

[0050] Step 101, obtain the operating parameters of the target pump and the operating parameters of the motor with pump, wherein the operating parameters include: outlet pressure, inlet pressure, and operating flow rate. In some embodiments of the present specification, the operating parameters of the target pump are obtained by sensors provided on the target pump. Specifically, the operating flow rate of the target pump is collected by the flow sensor on the target pump; the inlet pressure and outlet pressure of the target pump are collected by the 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 with pump are also obtained, wherein the motor with pump is a motor with a target pump.

[0051] In the embodiments of this specification, since the suction valve and the discharge valve of the target pump cannot be closed in time during actual operation, there may be leakage of high-pressure liquid at the pump valve, piston and other seals. The actual average flow rate of the reciprocating pump may be low due to the gas in the pump cylinder or the liquid reducing the suction fullness, poor suction conditions, etc., so the measured flow rate needs to be corrected.

[0052] In this manual, the flow correction formula is used to correct the operating flow: G SR =K·Q; where K represents the flow coefficient and Q represents the collected operating flow. The flow coefficient reflects the size of the leakage loss in the target pump, which is generally obtained by actual measurement on site and is generally between 0.85 and 0.95.

[0053] Step 102, determining the output power of the target pump according to the outlet pressure, inlet pressure and operating flow. In this step, the operating parameters of the motor with the pump include: the rated power of the motor, the load power of the motor, the no-load loss of the motor, the rated power of the motor, etc. This step also includes pre-processing the collected operating parameters of the target pump and estimating the output power of the target pump.

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

[0055] P Ru =(P SRout -P SRin )·G SR / α; where P Ru Indicates output power, in KW; P SRout Indicates the outlet pressure of the target pump, in MPa; P SRin Indicates the inlet pressure of the target pump in MPa; α is the unit conversion factor.

[0056] Step 103, according to the working parameters of the belt pump motor, determine the transmission efficiency from the motor to the main shaft. In the embodiment of this specification, the transmission efficiency from the motor to the main shaft is calculated based on the no-load loss of the motor, the rated power of the motor, the load factor of the motor, and the rated power of the motor. In this step, the calculation formula for calculating the transmission efficiency is detailed in Figure 2 describe.

[0057] Step 104 : determining the input power of the target pump according to the transmission efficiency, the average efficiency of the motor and the input power of the motor.

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

[0059] Step 105, determining the pump efficiency of the target pump according to the output power and the input power. In this step, the pump efficiency of the target pump is the ratio of the output power of the pump to the input power of the pump.

[0060] Step 106, monitor whether the target pump is in normal working state according to the pump efficiency and the preset threshold. In this step, by observing the change of pump efficiency during the normal operation of the electric direct drive pump, the pump efficiency is compared with the preset threshold, the state of the electric direct drive pump is judged, and corresponding measures are taken in time to find abnormal working conditions. Specifically, based on the real-time monitoring of the state of the target pump, when the pump efficiency is less than or equal to the preset threshold, it is determined that the working state of the pump is abnormal, and the remote diagnosis experts and engineering management departments can perform remote data analysis and fault diagnosis on all equipment included in the monitoring.

[0061] In some embodiments of the present specification, this step can be performed by the alarm system of the online monitoring system of the electric direct-drive pump status, wherein the alarm system includes an audible and visual alarm device and a signal sending device connected to the host computer. When a fault is received, the processor issues an action instruction, triggering the speaker to sound an alarm, the red light to light an alarm, and the GSM module sends an alarm text message to the on-duty mobile phone. As a result, the substation operator can easily discover abnormal pump operation during inspection or after receiving a text message, and immediately carry out corresponding processing to achieve online monitoring.

[0062] This manual is based on the electric direct-drive pump. By determining the pump efficiency of the target pump according to the operating parameter information, it finally determines whether it is necessary to perform a preset operation on the target pump, thereby automatically judging whether the target pump needs to implement the preset operation; it overcomes the technical problems of the prior art that on-site personnel need to frequently disassemble and inspect the pump, which results in a large workload and high construction risks.

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

[0064] Step 201, determine the transmission efficiency from the motor to the main shaft. Specifically, the transmission efficiency from the motor to the main shaft is determined according to the following formula:

[0065] Among them, P e 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 e Represents the average efficiency of the motor, which is a known quantity.

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

[0067] P Rs =P ei ·η e ·η t ;

[0068] Among them, P Rsrepresents the input power of the target pump, η t Indicates the transmission efficiency from the motor to the spindle; η e Represents the average efficiency of the motor, which is a known quantity; P ei Indicates the input power of the motor; P Rs Indicates the input power of the pump.

[0069] In the embodiment of this specification, the load rate of the motor is determined by the following method: the load rate of the motor is determined according to the running current of the motor, the rated current of the motor, and the no-load current of the motor:

[0070] Among them, β represents the load rate of the motor, I represents the running current of the motor; I e Indicates the rated current of the motor; I0 indicates the no-load current of the motor.

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

[0072] Step 301, determine the motor loss at rated load according to the rated power of the motor and the average efficiency of the motor. In the embodiment of this specification, the rated power of the motor is recorded as P e , the average efficiency of the motor is recorded as η e , determine the motor loss under rated load according to the following formula:

[0073] Among them, ΔP e Indicates the motor loss under rated load; η e Represents the average efficiency of the motor, where the average efficiency of the motor can be obtained from the nameplate or manufacturer, P e Indicates the rated power of the motor, which can be obtained from the nameplate or manufacturer.

[0074] Step 302, determining the no-load loss of the motor according to the load factor of the motor, the average efficiency of the motor, and the input power of the motor with a pump.

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

[0076]

[0077] Among them, ΔP0 represents the no-load loss of the motor, where the no-load loss of the motor is the fixed loss of the motor, P e is the rated power of the motor, β is the load rate of the motor, η e Indicates the average efficiency of the motor.

[0078] In the embodiment of this specification, after the transmission efficiency from the motor to the main shaft is calculated, the expression of 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, the calculated input power of the target pump is substituted into the pump efficiency calculation formula to obtain the efficiency of the target pump:

[0081]

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

[0083] like Figure 4 The figure shows a schematic diagram of the structure of an electric direct-drive pump state monitoring device based on pump efficiency in an embodiment of the present specification. The figure describes the basic structure of the electric direct-drive pump state monitoring device based on pump efficiency, wherein the functional units and modules can be implemented in software, or a general chip or a specific chip can be used to implement the electric direct-drive pump state monitoring based on pump efficiency. 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] An output power determination unit 402, used to determine the output power of the target pump according to the outlet pressure, inlet pressure and operating flow rate;

[0086] A transmission efficiency determination unit 403, used to determine the transmission efficiency from the motor to the main shaft according to the working parameters of the belt pump motor;

[0087] An input power determination unit 404, used to determine the input power of the target pump according to the working parameters of the pump motor;

[0088] A pump efficiency determination unit 405, configured to determine the pump efficiency of the target pump according to the output power and the input power;

[0089] The monitoring unit 406 is used to monitor whether the target pump is in a normal working state according to the pump efficiency and a preset threshold value.

[0090] In this manual, when the pump is in action, relevant signals are collected and relevant information is counted, so that online monitoring of the target pump efficiency can be achieved, so that the substation operation and maintenance personnel can visually check during daily inspections without additional operations. In addition, this manual also integrates existing data, and the database uses a structure that conforms to the daily workflow of substation operation to store data, which facilitates data maintenance and search. By adopting a management and maintenance system, when a fault occurs again, the system will automatically match the most similar fault situation for reference by the processing personnel to quickly find the fault.

[0091] This manual is based on the electric direct-drive pump. It determines the pump efficiency of the target pump according to the operating parameter information, and finally determines whether it is necessary to perform preset operations on the target pump, thereby automatically judging whether the target pump needs to implement the preset operations; there is no need for on-site manual experience sampling, and the pump must be maintained, serviced or replaced only after problems occur during operation. This effectively overcomes the technical problems in related technologies that require on-site personnel to frequently disassemble and inspect the pump, and problems with the pump will cause abnormal termination of the operation, resulting in a large workload for personnel and a high construction risk.

[0092] As an example of this specification, please refer to Figure 5 Shown is a schematic diagram of the specific structure of the electric direct-drive pump state monitoring device based on pump efficiency in this embodiment.

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

[0094] As an embodiment of the present specification, the transmission efficiency determination unit 403 further includes: a motor parameter acquisition module 4031, which is used to obtain 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, a computer device provided in an embodiment of this specification, the electric direct-drive pump state monitoring method based on pump efficiency can be executed by a computer device, and 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, which is used to store any kind of information such as code, settings, data, etc. Non-limiting, for example, the memory 606 may include any one or more combinations of the following: any type of RAM, any type of ROM, flash memory device, 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 an associated instruction stored in any memory or a combination of memories, the computer device 602 can perform any operation of the associated instruction. The computer device 602 also includes one or more drive mechanisms 608 for interacting with any memory, such as a hard disk drive mechanism, an optical disk drive mechanism, etc.

[0096] The computer device 602 may also include an input / output module 610 (I / O) for receiving various inputs (via input devices 612) and for providing various outputs (via output devices 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 not be included, and the computer device 602 may be used as a computer device in a network. The 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] The communication link 622 may be implemented in any manner, for example, through a local area network, a wide area network (e.g., the Internet), a point-to-point connection, etc., or any combination thereof. The 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] Corresponds to Figures 1 to 4 The method in the embodiment of the present specification also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method are executed.

[0099] The embodiment of the present specification also provides a computer-readable instruction, wherein when the processor executes the instruction, the program therein causes the processor to execute the following Figures 1 to 4 The method shown.

[0100] It should be understood that in the various embodiments of this specification, the size of the serial numbers of the above-mentioned processes does not mean 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 only a description of the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this specification generally indicates that the associated objects before and after are in an "or" relationship.

[0102] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed in this specification can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical specification. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this specification.

[0103] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned 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, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

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

[0106] In addition, each functional unit in each embodiment of this specification may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0107] If the integrated unit is implemented in the form of 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 specification is essentially 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, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of this specification. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0108] Specific embodiments are used in this specification to illustrate the principles and implementation methods of this specification. The description of the above embodiments is only used to help understand the methods and core ideas of this specification. At the same time, for those skilled in the art, according to the ideas of this specification, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on this specification.

Claims

1. A method for monitoring the state of an electric direct-drive pump based on pump efficiency, characterized in that: The method comprises: Obtaining 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; Determine the output power of the target pump according to the outlet pressure, inlet pressure and operating flow rate; Determining the transmission efficiency from the motor to the main shaft according to the working parameters of the motor with pump; Determining the input power of the target pump according to the transmission efficiency, the average efficiency of the motor and the input power of the motor; Determining the pump efficiency of the target pump according to the output power and the input power; Based on the pump efficiency and the preset threshold, monitor whether the target pump is in a normal working state.

2. The method for monitoring the state of an electric direct-drive pump based on pump efficiency according to claim 1, characterized in that: The method comprises: Determine the transmission efficiency from the motor to the spindle according to the following formula: Among them, P e 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 e represents the average efficiency of the motor, which is a known quantity; According to the transmission efficiency, the input power of the target pump is determined using the following formula: P Rs =P ei ·or e ·or t ; Among them, P Rs represents the input power of the target pump, η t Indicates the transmission efficiency from the motor to the spindle; η e Represents the average efficiency of the motor, which is a known quantity; P ei Indicates the input power of the motor; P Rs Indicates the input power of the pump.

3. The method for monitoring the state of an electric direct-drive pump based on pump efficiency according to claim 2 is characterized in that: The load factor of the motor is determined as follows: Determine the motor load rate based on the motor operating current, motor rated current, and motor no-load current: Among them, β represents the load rate of the motor, I represents the running current of the motor; I e Indicates the rated current of the motor; I0 indicates the no-load current of the motor.

4. The method for monitoring the state of an electric direct-drive pump based on pump efficiency according to claim 3 is characterized in that: The motor no-load loss is determined as follows: According to the rated power P of the motor e 、Average efficiency of motor η e , determine the motor loss ΔP at rated load e ; According to the motor load rate β, motor average efficiency η e 、Input power P of pump motor ei , determine the motor no-load loss ΔP0.

5. The method for monitoring the state of an electric direct-drive pump based on pump efficiency according to claim 4 is characterized in that: The no-load loss of the motor is determined by the following formula: Among them, ΔP0 represents the no-load loss of the motor, where the no-load loss of the motor is the fixed loss of the motor, P e is the rated power of the motor, β is the load rate of the motor, η e Indicates the average efficiency of the motor.

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

7. The method for monitoring the state of an electric direct-drive pump based on pump efficiency according to claim 1, characterized in that: The method further comprises: The flow coefficient is used to correct the collected operating flow.

8. A pump efficiency-based electric direct-drive pump state monitoring device, characterized in that: The device comprises: A parameter acquisition unit, 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; An output power determination unit, used to determine the output power of the target pump according to the outlet pressure, inlet pressure and operating flow rate; A transmission efficiency determination unit, used to determine the transmission efficiency from the motor to the main shaft according to the working parameters of the motor with pump; An input power determination unit, used to determine the input power of the target pump according to the transmission efficiency, the average efficiency of the motor and the input power of the motor; A pump efficiency determination unit, used to determine the pump efficiency of the target pump according to the output power and the input power; The monitoring unit is used to monitor whether the target pump is in a normal working state according to the pump efficiency and a preset threshold value.

9. 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, the method according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

Images