An intelligent canned motor pump with health perception

Abstract

The present invention belongs to the technical field of intelligent equipment, and is an intelligent shielded pump with health perception, including a pump body and a rotating component detection unit arranged on the pump body, a health detection and analysis unit, an industrial control network interface, a first and a second acceleration vibration sensor, an integrated shaft displacement sensor, a shaft tilt induction coil and a weak power supply system. The intelligent shielded pump is an integrated configuration of a shielded pump rotating component real-time detection component, a shaft displacement detection unit, an information collection and intelligent diagnosis unit and an industrial network interconnection unit with the shielded pump body, and a core algorithm based on MPU embedded software is used to construct an intelligent shielded pump with health online perception and fault diagnosis with online state detection of shaft displacement and shaft offset, and can be directly interconnected with the industrial control system.

Description

Technical Field

[0001] The present invention relates to an intelligent canned pump with health perception, belonging to the technical field of intelligent equipment. Background Art

[0002] The canned motor pump is a special industrial closed pump used for conveying dangerous, toxic, corrosive and high-temperature media in the fields of industry, national defense, environmental protection, etc. Its characteristics are that the conveying medium is in a sealed space with the pump's drive shaft, pump motor stator, impeller and support bearing, and the stator of the drive motor is isolated from the conveying medium by an anti-corrosion protective sleeve. The medium conveying in many links of nuclear power plants and the conveying pumps for rocket liquid fuel filling all use canned motor pumps. In addition, the nuclear main pump of the nuclear power plant is also a canned motor pump. Due to the importance of the application field and the harmfulness of the medium, the safe operation of the canned motor pump is particularly important. In particular, in the contemporary era when the concepts of intelligent manufacturing and state operation and maintenance are deeply popularized in smart factories, equipment with health perception and fault diagnosis capabilities is the cornerstone of the intelligent manufacturing system. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an intelligent canned pump with health perception. The intelligent canned pump integrates the real-time detection component of the rotating parts of the canned pump, the shaft displacement detection unit, the information collection and intelligent diagnosis unit and the industrial network interconnection unit with the canned pump body, and constructs an intelligent canned pump with health online perception and fault diagnosis with shaft displacement and shaft offset online state detection through the core algorithm based on MPU embedded software, and can realize direct network interconnection with the industrial control system.

[0004] In order to achieve the above-mentioned purpose of the invention and solve the problems existing in the prior art, the technical solution adopted by the present invention is: an intelligent shielded pump with health perception, including a pump body and a rotating component detection unit, a health detection and analysis unit, an industrial control network interface, a first and a second acceleration vibration sensor, an integrated shaft displacement sensor, a shaft tilt induction coil and a weak current power supply system, wherein the output end of the weak current power supply system is respectively connected to the input end of the industrial control network interface, the input end of the health detection and analysis unit and the input end of the rotating component detection unit, for providing a stable DC power supply voltage, the industrial control network interface is connected to the health detection and analysis unit via UART, the health detection and analysis unit is connected to the rotating component detection unit via SPI, the input ends of the first and the second acceleration vibration sensors are respectively connected to the output end of the rotating component detection unit, the output ends of the first and the second acceleration vibration sensors are respectively connected to the input end of the rotating component detection unit, and the output ends of the integrated shaft displacement sensor and the shaft tilt induction coil are respectively connected to the input end of the rotating component detection unit.

[0005] The rotating component detection unit includes an off-axis induction coil, a differential induction coil, a constant current excitation and signal processing unit, an amplification and filtering unipolar processing unit, an axial displacement transmission unit based on differential induction, and an A / D conversion unit. The input and output ends of the first acceleration vibration sensor are respectively connected to the output and input ends of the constant current excitation and signal processing unit, the input and output ends of the second acceleration vibration sensor are respectively connected to the output and input ends of the constant current excitation and signal processing unit, the output end of the off-axis induction coil is connected to the input end of the amplification and filtering unipolar processing unit, the output end of the differential induction coil is connected to the input end of the axial displacement transmission unit based on differential induction, and the output ends of the constant current excitation and signal processing unit, the amplification and filtering unipolar processing unit, and the axial displacement transmission unit based on differential induction are respectively connected to the input end of the A / D conversion unit through VIN.

[0006] The health detection and analysis unit includes an LED display, a Hall element magnetic switch button group, an MPU health analysis core unit, a FLASH event memory and a communication unit. The rotating component detection unit is connected to the MPU health analysis core unit via SPI, the MPU health analysis core unit is connected to the FLASH event memory via SPI, the LED display is connected to the MPU health analysis core unit via UART, the output end of the Hall element magnetic switch button group is connected to the input end of the MPU health analysis core unit, and the MPU health analysis core unit is connected to the communication unit via UART.

[0007] The industrial control network interface includes a CANBUS interface unit, a first and a second bidirectional photoelectric isolation, a CANBUS interface driver, an RS-485 interface driver, a 4GNB-IOT / zigbee module, an industrial Ethernet interface IC, an interface driver and an EEPROM event memory. The MPU health analysis core unit is connected to the EEPROM event memory, the 4GNB-IOT / zigbee module and the industrial Ethernet interface IC through SPI, respectively. The industrial Ethernet interface IC is connected to the interface driver through LAN. The MPU health analysis core unit is connected to the CANBUS interface unit through UART. The output and input ends of the CANBUS interface unit are respectively connected to the input and output ends of the first bidirectional photoelectric isolation, and the output and input ends of the first bidirectional photoelectric isolation are respectively connected to the input and output ends of the CANBUS interface driver. The MPU health analysis core unit is connected to the second bidirectional photoelectric isolation through UART, and the output and input ends of the second bidirectional photoelectric isolation are respectively connected to the input and output ends of the RS-485 interface driver.

[0008] The weak current power supply system includes a power supply filter and a peak / surge absorption unit, a self-recovery fuse, a transformer, a rectifier unit and a voltage stabilizing circuit connected thereto in sequence. The output 3.3V weak current power supply is respectively connected to the first DC / DC isolation power supply and the second DC / DC isolation power supply.

[0009] The beneficial effect of the present invention is: an intelligent shielded pump with health perception, including a pump body and a rotating component detection unit arranged on the pump body, a health detection and analysis unit, an industrial control network interface, the first and second acceleration vibration sensors, an integrated shaft displacement sensor, a shaft tilt induction coil and a weak power supply system. The intelligent shielded pump is an integrated configuration of the shielded pump rotating component real-time detection component, the shaft displacement detection unit, the information collection and intelligent diagnosis unit and the industrial network interconnection unit with the shielded pump body, and a core algorithm based on the MPU embedded software is used to construct an intelligent shielded pump with health online perception and fault diagnosis with online state detection of shaft displacement and shaft offset, and can be directly interconnected with the industrial control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural block diagram of the present invention.

[0011] Figure 2 It is a schematic diagram of the structure of the present invention.

[0012] In the figure: 1. The first acceleration vibration sensor, 1 a , the second acceleration vibration sensor, 2. shaft tilt sensing coil, 3. integrated shaft displacement sensor, 4. health detection and analysis unit, 5. rotating parts detection unit, 6. industrial control network interface, 7. pump body.

[0013] Figure 3 It is a principle block diagram of the rotating component detection unit in the present invention.

[0014] Figure 4 It is a principle block diagram of the health detection and analysis unit in the present invention.

[0015] Figure 5 It is a principle block diagram of the industrial control network interface in the present invention.

[0016] Figure 6 It is a principle block diagram of the weak current power supply system in the present invention.

[0017] Figure 7 It is a block diagram of the shaft displacement detection unit in the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1As shown, an intelligent canned pump with health perception includes a pump body and a rotating component detection unit, a health detection and analysis unit, an industrial control network interface, a first and a second acceleration vibration sensor, an integrated shaft displacement sensor, a shaft tilt induction coil and a weak current power supply system, wherein the output end of the weak current power supply system is respectively connected to the input end of the industrial control network interface, the input end of the health detection and analysis unit and the input end of the rotating component detection unit to provide a stable DC power supply voltage, the industrial control network interface is connected to the health detection and analysis unit via UART, the health detection and analysis unit is connected to the rotating component detection unit via SPI, the input ends of the first and the second acceleration vibration sensors are respectively connected to the output end of the rotating component detection unit, the output ends of the first and the second acceleration vibration sensors are respectively connected to the input end of the rotating component detection unit, and the output ends of the integrated shaft displacement sensor and the shaft tilt induction coil are respectively connected to the input end of the rotating component detection unit.

[0020] like Figure 3 As shown, the rotating component detection unit includes an off-axis induction coil, a differential induction coil, a constant current excitation and signal processing unit, an amplification, filtering unipolar processing unit, an axial displacement transmitter unit based on differential induction, and an A / D conversion unit. The input and output ends of the first acceleration vibration sensor are respectively connected to the output and input ends of the constant current excitation and signal processing unit, the input and output ends of the second acceleration vibration sensor are respectively connected to the output and input ends of the constant current excitation and signal processing unit, the output end of the off-axis induction coil is connected to the input end of the amplification, filtering unipolar processing unit, the output end of the differential induction coil is connected to the input end of the axial displacement transmitter unit based on differential induction, and the output ends of the constant current excitation and signal processing unit, the amplification, filtering unipolar processing unit, and the axial displacement transmitter unit based on differential induction are respectively connected to the input end of the A / D conversion unit through VIN.

[0021] The rotating parts of the intelligent shielded pump include an impeller and a transmission shaft and support bearings integrated with the motor rotor. Due to the instability of the conveying medium pressure, the uneven force on the impeller during the use of the shielded pump will cause the transmission shaft to bear non-axial forces, which will cause irregular wear of the bearings and even tilt of the transmission shaft; in severe cases, it will cause the impeller to hit the shell and the motor stator shaft to hit the "protective cover". The rotating parts measurement unit of the intelligent shielded pump with health perception of the present invention includes: "shell contact" / overshock detection based on acceleration motion sensor, "eccentricity" detection based on induction coil and "axial wear" detection based on integrated shaft displacement sensor. The functions of each part are:

[0022] 1) Constant current excitation and signal processing

[0023] The constant current excitation of the acceleration sensor used in the "intelligent canned pump with health perception" involved in the present invention is provided by the moving parts detection unit of the device, and the deceleration sensor signal is band-pass filtered by the "constant current excitation and signal processing" unit to obtain the effective signal within the effective bandwidth, and then read and analyzed by the "health analysis unit" through the SPI interface after A / D conversion.

[0024] 2) Signal processing of “off-axis” induction coil

[0025] The signal of "eccentricity" detection comes from the "differential detection coil" symmetrically wound with the stator coil. When the motor stator is completely "symmetrical", the coil theoretically has no differential induced voltage output. When the bearings supporting the stator and the impeller shaft of the pump rotate asymmetrically due to wear, the differential induction coil outputs an output voltage corresponding to the "asymmetric deviation". The signal processing of the "eccentricity" induction coil amplifies and filters the "eccentricity" induced voltage (mainly filtering out the high-frequency noise generated by the variable frequency drive).

[0026] 3) Axis displacement detection

[0027] During the use of the shielded pump, the fluctuation of the external pipeline pressure of the conveying medium will cause the impeller to generate axial push and pull forces on the transmission shaft, which will cause axial wear of the pump's support bearings. The axial displacement caused by severe axial wear is an important indicator for judging the health of the shielded pump. During the factory inspection of the shielded pump, the axial displacement must be within a reasonable range. The intelligent shielded pump with health perception described in the present invention realizes online detection and health evaluation of the axial wear of the shielded pump by integrating the online axial displacement detection unit with the shielded pump.

[0028] like Figure 4 As shown, the health detection and analysis unit includes an LED display, a Hall element magnetic switch button group, an MPU health analysis core unit, a FLASH event memory and a communication unit. The rotating component detection unit is connected to the MPU health analysis core unit via SPI, the MPU health analysis core unit is connected to the FLASH event memory via SPI, the LED display is connected to the MPU health analysis core unit via UART, the output end of the Hall element magnetic switch button group is connected to the input end of the MPU health analysis core unit, and the MPU health analysis core unit is connected to the communication unit via UART.

[0029] like Figure 4As shown in the figure, the health perception analysis is completed by the MPU software in the figure, and the LED display unit is operated by the "Hall element magnetic switch button" to realize the display of the status parameters of the shielded pump moving parts (effective value of vibration data, shaft offset voltage, shaft displacement), health evaluation parameters (scale method %) and fault alarm status display (impeller hitting the shell, rotor shaft wear exceeding the limit, shaft displacement exceeding the limit). The alarm "event" is permanently recorded in the EEPROM memory, and the SCADA system or equipment management system can monitor the equipment, read the status data in real time, and trace the historical alarm "event" through the communication unit of this system (supporting MODBUS, LAN, wireless zigbee / 4GNB IOT).

[0030] like Figure 4 The "health monitoring and analysis unit" shown is the core of the entire system, and its core microprocessor is the STM32-L4 series MPU. The fault "event" permanent memory uses a large-capacity FLASH memory that can support more than 512G of data storage.

[0031] During the factory performance test of the canned pump, the "health monitoring and analysis unit" of the intelligent canned pump with health perception described in the present invention tests and records the basic vibration noise, "eccentric" induction coil voltage initial value, and shaft displacement initial value of the pump body under rated working conditions. These data are the basic reference for the health evaluation of the canned pump throughout its life cycle. During the after-sales use of the intelligent canned pump with health perception, the embedded software running in the "health monitoring and analysis unit" MPU monitors vibration noise, "eccentric" voltage, and shaft displacement, and calculates the "health score" of the intelligent canned pump with health perception of the present invention by constructing a comprehensive score and a "ruler" measurement method, and performs real-time fault diagnosis and judgment of the intelligent canned pump with health perception through the impeller "shell contact" judgment algorithm, "eccentric" over-limit judgment algorithm, and "shaft displacement" over-limit measurement method. The industrial control system (SCADA system) and equipment monitoring and management system using the intelligent canned pump with health perception described in the present invention obtain the operating status, health data, fault alarm data, and historical data of the pump in real time by selecting the network communication method and communication protocol provided by the intelligent canned pump with health perception.

[0032] like Figure 5As shown, the industrial control network interface includes a CANBUS interface unit, a first and a second bidirectional photoelectric isolation, a CANBUS interface driver, an RS-485 interface driver, a 4GNB-IOT / zigbee module, an industrial Ethernet interface IC, an interface driver and an EEPROM event memory. The MPU health analysis core unit is connected to the EEPROM event memory, the 4GNB-IOT / zigbee module and the industrial Ethernet interface IC through SPI, respectively. The industrial Ethernet interface IC is connected to the interface driver through LAN. The MPU health analysis core unit is connected to the CANBUS interface unit through UART. The output and input ends of the CANBUS interface unit are respectively connected to the input and output ends of the first bidirectional photoelectric isolation, and the output and input ends of the first bidirectional photoelectric isolation are respectively connected to the input and output ends of the CANBUS interface driver. The MPU health analysis core unit is connected to the second bidirectional photoelectric isolation through UART, and the output and input ends of the second bidirectional photoelectric isolation are respectively connected to the input and output ends of the RS-485 interface driver.

[0033] The intelligent canned pump with health perception and the industrial control system / equipment monitoring and management system of the present invention can build an information channel through industrial Ethernet, field bus (RS-485, CAN-BUS), wireless monitoring network 4G NB IOT (remote) or wireless sensor network zigbee (100-300 meters). Users can choose the communication networking mode.

[0034] like Figure 7 As shown in the figure, the shaft displacement sensor and the shielded pump are integrated in structure. The differential induction coil of the sensor is placed in the end cover groove of the shielded pump (and can be flexibly replaced). A heat dissipation circulating water jacket is provided outside the end cover groove of the shielded pump to cool the temperature of the detection coil to ensure the stability of shaft displacement detection. The magnetic detection body of the shaft displacement sensor (iron-nickel alloy detection rod, covered with 304 stainless steel sleeve) is coaxially connected to the motor rotor shaft.

Claims

1. An intelligent canned motor pump with health perception, comprising a pump body and a rotating component detection unit arranged on the pump body, a health detection and analysis unit, an industrial control network interface, a first and a second acceleration vibration sensor, an integrated shaft displacement sensor, a shaft tilt induction coil and a weak current power supply system, characterized in that: The output end of the weak current power supply system is respectively connected to the input end of the industrial control network interface, the input end of the health detection and analysis unit and the input end of the rotating component detection unit, for providing a stable DC power supply voltage. The industrial control network interface is connected to the health detection and analysis unit via UART, and the health detection and analysis unit is connected to the rotating component detection unit via SPI. The first and second acceleration vibration sensor input ends are respectively connected to the output end of the rotating component detection unit, and the first and second acceleration vibration sensor output ends are respectively connected to the input end of the rotating component detection unit. The integrated shaft displacement sensor and the shaft tilt induction coil output ends are respectively connected to the input end of the rotating component detection unit; The rotating component detection unit includes an off-axis induction coil, a differential induction coil, a constant current excitation and signal processing unit, an amplification and filtering unipolar processing unit, an axial displacement transmission unit based on differential induction, and an A / D conversion unit. The input and output ends of the first acceleration vibration sensor are respectively connected to the output and input ends of the constant current excitation and signal processing unit, the input and output ends of the second acceleration vibration sensor are respectively connected to the output and input ends of the constant current excitation and signal processing unit, the output end of the off-axis induction coil is connected to the input end of the amplification and filtering unipolar processing unit, the output end of the differential induction coil is connected to the input end of the axial displacement transmission unit based on differential induction, and the output ends of the constant current excitation and signal processing unit, the amplification and filtering unipolar processing unit, and the axial displacement transmission unit based on differential induction are respectively connected to the input end of the A / D conversion unit through VIN.

2. The intelligent canned motor pump with health perception according to claim 1, characterized in that: The health detection and analysis unit includes an LED display, a Hall element magnetic switch button group, an MPU health analysis core unit, a FLASH event memory and a communication unit. The rotating component detection unit is connected to the MPU health analysis core unit via SPI, the MPU health analysis core unit is connected to the FLASH event memory via SPI, the LED display is connected to the MPU health analysis core unit via UART, the output end of the Hall element magnetic switch button group is connected to the input end of the MPU health analysis core unit, and the MPU health analysis core unit is connected to the communication unit via UART.

3. The intelligent canned motor pump with health perception according to claim 2, characterized in that: The industrial control network interface includes a CANBUS interface unit, a first and a second bidirectional photoelectric isolation, a CANBUS interface driver, an RS-485 interface driver, a 4GNB-IOT / zigbee module, an industrial Ethernet interface IC, an interface driver and an EEPROM event memory. The MPU health analysis core unit is connected to the EEPROM event memory, the 4GNB-IOT / zigbee module and the industrial Ethernet interface IC through SPI, respectively. The industrial Ethernet interface IC is connected to the interface driver through LAN. The MPU health analysis core unit is connected to the CANBUS interface unit through UART. The output and input ends of the CANBUS interface unit are respectively connected to the input and output ends of the first bidirectional photoelectric isolation, and the output and input ends of the first bidirectional photoelectric isolation are respectively connected to the input and output ends of the CANBUS interface driver. The MPU health analysis core unit is connected to the second bidirectional photoelectric isolation through UART, and the output and input ends of the second bidirectional photoelectric isolation are respectively connected to the input and output ends of the RS-485 interface driver.

Images