Rotor fluorescent optical fiber temperature measurement system

Abstract

The utility model discloses a rotor fluorescent optical fiber temperature measurement system, and belongs to the technical field of optical fiber temperature measurement. A rotor fluorescent optical fiber temperature measurement system comprises a temperature measurement module, a power supply module and a communication module. The temperature measuring module is arranged on the rotor and detects the temperature of the rotor; the power supply module supplies power to the temperature measurement module and provides working voltage; the communication module is connected with the temperature measurement module and converts temperature data monitored by the temperature measurement module into serial port signals to be sent to the control terminal, and the temperature measurement module comprises a fluorescence signal demodulation module and a fluorescence optical fiber probe connected with the fluorescence signal demodulation module; the plurality of fluorescence signal demodulation modules are arranged at the end part of the rotor and are uniformly distributed around the axis of the rotor; the fluorescent optical fiber probe is mounted at a corresponding temperature measuring point of the rotor according to a temperature measuring requirement; the fluorescence signal demodulation module comprises a single-chip microcomputer, an operational amplifier, an excitation light source, a photoelectric detector and a serial port conversion circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fiber sensors, in particular to a rotor fluorescent optical fiber temperature measurement system. Background Art

[0002] Motor temperature is a key data that affects motor safety and performance. Temperature rise is a potential safety hazard for motors, which has a serious impact on the safe and stable operation of motors, water pumps, hydropower units and even the entire power project. The installed capacity of hydropower units in my country continues to increase, and the proportion of hydropower in my country's energy industry continues to grow. How to ensure the safe and reliable operation of hydropower units has been a technical issue that has been studied at home and abroad in recent years.

[0003] In terms of motor temperature rise monitoring, the most commonly used method at home and abroad is the thermocouple temperature measurement method, which is to install platinum resistance temperature sensors on the stator windings and bearings. However, its anti-interference performance to electromagnetic signals is poor, which seriously affects the accuracy of temperature measurement. In addition, the platinum resistance temperature sensor of the high-voltage generator is prone to insulation breakdown, and there is a risk of high voltage being connected to the weak current system, endangering the safety of staff and background equipment.

[0004] Fluorescent fiber temperature measurement is based on the fact that the luminescence characteristics of rare earth fluorescent materials change with temperature T. It has the advantages of strong anti-interference ability, high voltage resistance, high sensitivity, safety and durability. Due to the rotating structure of the motor, signal transmission is difficult, resulting in the inability to directly measure the actual temperature rise inside the motor. Rotor temperature testing has always been a difficult point in the industry. Rotor temperature measurement is currently mainly concentrated in two technical routes: wireless telemetry and high-speed slip rings. Since the slip ring requires long-term friction and mechanical wear when working, its service life will be relatively short. Long-term use may cause the conductive ring to wear and fail, affecting the transmission of current and reducing its life. Wireless communication is an important means to achieve information transmission between the rotor and the stator, but wireless transmission devices such as Bluetooth and WiFi are susceptible to electromagnetic interference in a strong electromagnetic field environment, and there is data distortion, which cannot accurately reflect the internal temperature data of the turbine rotor. Utility Model Content

[0005] The utility model aims to provide a rotor fluorescent optical fiber temperature measurement system.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A rotor fluorescent optical fiber temperature measurement system comprises a temperature measurement module, a power supply module and a communication module; the temperature measurement module is arranged on the rotor to detect the rotor temperature; the power supply module supplies power to the temperature measurement module and provides working voltage; the communication module is connected to the temperature measurement module to convert the temperature data monitored by the temperature measurement module into a serial port signal and send it to a control terminal; the temperature measurement module comprises a fluorescent signal demodulation module and a fluorescent optical fiber probe connected to the fluorescent signal demodulation module; a plurality of fluorescent signal demodulation modules are provided, which are arranged at the end of the rotor and evenly distributed around the rotor axis; the fluorescent optical fiber probe is installed at the corresponding temperature measurement point of the rotor according to the temperature measurement requirements;

[0008] The fluorescence signal demodulation module includes a single chip microcomputer, an operational amplifier, an excitation light source, a photodetector and a serial port conversion circuit;

[0009] The single-chip microcomputer is connected to an excitation light source, and the single-chip microcomputer controls the excitation light source to emit pulsed light. The light is coupled into the fluorescent fiber probe after being collimated, and the fluorescent material at the end of the fluorescent fiber probe is excited to generate fluorescence. The output end of the photodetector is connected to the input end of the operational amplifier, and the output end of the operational amplifier is connected to the single-chip microcomputer. The photodetector collects the fluorescence generated by the fluorescent fiber probe, and the signal enters the single-chip microcomputer after being amplified by the operational amplifier. The single-chip microcomputer calculates the fluorescence lifetime using the integral method. The single-chip microcomputer is also connected to a serial port conversion circuit, and the fluorescence lifetime value is sent to the communication module through the serial port conversion circuit.

[0010] As a preferred technical solution, the excitation light source is a semiconductor laser LD.

[0011] As a preferred technical solution, the power supply module is a wireless power supply module, which includes a wireless power supply transmitting end and a wireless power supply receiving end; the wireless power supply transmitting end and the wireless power supply receiving end both include an electromagnetic induction coil and a conversion circuit connected to the electromagnetic induction coil;

[0012] The electromagnetic induction coil of the wireless power transmission end is arranged at the end of the stator facing the rotor, and its axis coincides with the stator axis; the electromagnetic induction coil is connected to the power supply through the conversion circuit;

[0013] The electromagnetic induction coil of the wireless power receiving end is arranged at the end of the rotor facing the stator, and its axis coincides with the axis of the rotor; the electromagnetic induction coil is connected to the fluorescence signal demodulation module through the conversion circuit to supply power to the fluorescence signal demodulation module;

[0014] The electromagnetic induction coil at the wireless power receiving end and the electromagnetic induction coil at the wireless power transmitting end correspond in position, and wireless power supply from the stator to the rotor is achieved through electromagnetic coupling.

[0015] As a preferred technical solution, the communication module is an optical communication module, including an optical communication transmitting end and an optical communication receiving end; the optical communication transmitting end and the optical communication receiving end are both provided with a laser and a photodetector, and the wavelengths of the laser of the optical communication transmitting end and the laser of the optical communication receiving end are different; the optical communication transmitting end is arranged in the middle of the end face of the rotor facing the stator, and the optical communication receiving end is arranged in the middle of the end face of the stator facing the rotor, and the positions of the two correspond.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model provides a turbine rotor fluorescence temperature measurement system. The fluorescence signal demodulation module is placed at the end of the rotor. The wireless power supply module and the optical communication module communicate with the stator end. The whole set of rotor signal extraction devices is not affected by high voltage and strong magnetic field, and can accurately reflect the operation of the turbine. Due to the use of optical communication, the problem of short life of the slip ring is overcome, and stable and reliable rotor temperature measurement can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the rotor end.

[0019] Figure 2 This is a schematic diagram of the structure of the rotor fluorescent fiber optic temperature measurement system.

[0020] Among them, the figure numbers are as follows: 1-fluorescence signal demodulation module, 2-wireless power supply receiving end, 3-optical communication transmitting end, 4-fluorescence fiber optic probe, 5-rotor, 6-stator, 7-wireless power supply transmitting end, 8-optical communication receiving end. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] On the contrary, the present application covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present application as defined by the claims. Further, in order to make the public have a better understanding of the present application, some specific details are described in detail in the detailed description of the present application below. Those skilled in the art can fully understand the present application without the description of these details.

[0023] Example

[0024] like Figure 1-2 As shown, a rotor 5 fluorescent optical fiber temperature measurement system includes a temperature measurement module, a power supply module and a communication module.

[0025] The temperature measuring module is arranged on the rotor 5 to detect the temperature of the rotor 5; the power supply module supplies power to the temperature measuring module and provides working voltage; the communication module is connected to the temperature measuring module to convert the temperature data monitored by the temperature measuring module into a serial port signal and send it to the control terminal.

[0026] The temperature measurement module includes a fluorescence signal demodulation module 1 and a fluorescence fiber probe 4 connected to the fluorescence signal demodulation module 1. A plurality of fluorescence signal demodulation modules 1 are arranged at the ends of the rotor 5 and evenly distributed around the axis of the rotor 5. The fluorescence fiber probe 4 is installed at the corresponding temperature measurement point of the rotor 5 according to the temperature measurement requirements.

[0027] The fluorescence signal demodulation module 1 realizes the excitation, reception, analysis and encoding of the fluorescence signal, and includes a single chip microcomputer, an operational amplifier, an excitation light source, a photodetector and a serial port conversion circuit.

[0028] The single chip microcomputer is connected to the excitation light source, and the single chip microcomputer controls the excitation light source to work. The laser is coupled to the fluorescent optical fiber probe 4 after being collimated, and the fluorescent optical fiber probe 4 generates fluorescence.

[0029] The output end of the photodetector is connected to the input end of the operational amplifier, and the output end of the operational amplifier is connected to the single-chip microcomputer; the photodetector collects the fluorescence generated by the fluorescent optical fiber probe 4, and after being amplified by the operational amplifier, it enters the single-chip microcomputer, and the single-chip microcomputer calculates the fluorescence lifetime using the integral method;

[0030] The single chip microcomputer is also connected to a serial port conversion circuit, and the fluorescence lifetime value is sent to the communication module through the serial port conversion circuit.

[0031] In some feasible embodiments, the excitation light source is a semiconductor laser LD.

[0032] In some feasible embodiments, the power supply module is a wireless power supply module, which includes a wireless power supply transmitting terminal 7 and a wireless power supply receiving terminal 2; the wireless power supply transmitting terminal 7 and the wireless power supply receiving terminal 2 both include an electromagnetic induction coil and a conversion circuit connected to the electromagnetic induction coil.

[0033] The electromagnetic induction coil of the wireless power supply transmitting end 7 is arranged at the end of the stator 6 facing the rotor 5, and its axis coincides with the axis of the stator 6; the electromagnetic induction coil is connected to the power supply through the conversion circuit.

[0034] The electromagnetic induction coil of the wireless power receiving end 2 is arranged at the end of the rotor 5 facing the stator 6, and its axis coincides with the axis of the rotor 5; the electromagnetic induction coil is connected to the fluorescence signal demodulation module 1 through a conversion circuit; and the fluorescence signal demodulation module 1 is powered.

[0035] The electromagnetic induction coil of the wireless power receiving end 2 and the electromagnetic induction coil of the wireless power transmitting end 7 correspond in position, and wireless power supply from the stator 6 to the rotor 5 is achieved through electromagnetic coupling.

[0036] In some feasible embodiments, the communication module is an optical communication module, including an optical communication transmitting end 3 and an optical communication receiving end 8; the optical communication transmitting end 3 and the optical communication receiving end 8 both include a laser and a photodetector, and the wavelengths of the laser of the optical communication transmitting end 3 and the laser of the optical communication receiving end 8 are different; the optical communication transmitting end 3 is arranged in the middle of the end surface of the rotor 5 facing the stator 6, and the optical communication receiving end 8 is arranged in the middle of the end surface of the stator 6 facing the rotor 5, and the positions of the two correspond.

[0037] By setting two lasers with different wavelengths, the optical communication module uses lasers with wavelengths of 1310nm and 1550nm for communication.

[0038] Specifically, the optical communication transmitting end 3 is provided with a first optical path transmission channel, and the first optical path transmission channel is provided with a laser reflector, a laser dichroic mirror, and a collimating lens from the inside to the outside to intercept the first optical path transmission channel; the transmitting end is provided with positions for placing a laser and a photodetector, and the laser and the photodetector are coupled to the first optical path transmission channel after passing through the laser reflector and the dichroic mirror respectively; the laser dichroic mirror and the laser reflector are both tilted, and the tilt angle makes them form an angle of 45° with the first laser optical path;

[0039] The optical communication receiving end 8 is provided with a second optical path transmission channel, and the second optical path transmission channel is provided with a laser reflector, a laser dichroic mirror, and a collimating lens from the inside to the outside to intercept the second optical path transmission channel; the transmitting end is provided with positions for placing a photoelectric detector and a laser, and the photoelectric detector and the laser are coupled to the second optical path transmission channel after the laser reflector and the dichroic mirror respectively; the laser dichroic mirror and the laser reflector are both tilted, and the tilt angle makes them form an angle of 45° with the laser optical path.

[0040] The wavelength of the laser at the optical communication transmitting end 3 is 1310 nm, and the wavelength of the laser at the optical communication receiving end 8 is 1550 nm.

[0041] The parameters of the laser dichroic mirror of the optical communication transmitting end 3 are a transmission wavelength of 1310 nm and a reflection wavelength of 1550 nm; the parameters of the laser dichroic mirror of the optical communication receiving end 8 are a transmission wavelength of 1310 nm and a reflection wavelength of 1550 nm.

[0042] In the optical communication module, the dichroic mirror reflects 1550nm light and transmits 1310nm light. A filter of the corresponding wavelength is added to the front end of the photodetector to pass the light emitted by the laser on the opposite side and isolate the light of the laser on this side to prevent mutual interference between the emitted and received light.

[0043] It is worth noting that, based on the above structural design, in order to solve the same technical problem, even if some insubstantial improvements are made on the present invention, they also fall within the protection scope of the present invention.

Claims

1. A rotor fluorescent optical fiber temperature measurement system, comprising a temperature measurement module, a power supply module and a communication module; the temperature measurement module is arranged on the rotor to detect the rotor temperature; the power supply module supplies power to the temperature measurement module and provides working voltage; the communication module is connected to the temperature measurement module, and converts the temperature data monitored by the temperature measurement module into a serial port signal and sends it to the control terminal, characterized in that: The temperature measurement module includes a fluorescence signal demodulation module and a fluorescence optical fiber probe connected to the fluorescence signal demodulation module; a plurality of fluorescence signal demodulation modules are arranged at the ends of the rotor and evenly distributed around the rotor axis; the fluorescence optical fiber probe is installed at the corresponding temperature measurement point of the rotor according to the temperature measurement requirements; The fluorescence signal demodulation module includes a single chip microcomputer, an operational amplifier, an excitation light source, a photodetector and a serial port conversion circuit; The single-chip microcomputer is connected to an excitation light source, and the single-chip microcomputer controls the operation of the excitation light source. The laser is coupled to the fluorescent fiber probe after being collimated, and the fluorescent material at the end of the fluorescent fiber probe is excited to generate fluorescence; the output end of the photodetector is connected to the input end of the operational amplifier, and the output end of the operational amplifier is connected to the single-chip microcomputer; the photodetector collects the fluorescence generated by the fluorescent fiber probe, and after being amplified by the operational amplifier, it enters the single-chip microcomputer, and the single-chip microcomputer calculates the fluorescence lifetime using the integration method; the single-chip microcomputer is also connected to a serial port conversion circuit, and the fluorescence lifetime value is sent to the communication module through the serial port conversion circuit.

2. A rotor fluorescent optical fiber temperature measurement system according to claim 1, characterized in that: The excitation light source is a semiconductor laser LD.

3. A rotor fluorescent optical fiber temperature measurement system according to claim 1, characterized in that: The power supply module is a wireless power supply module, which includes a wireless power supply transmitting end and a wireless power supply receiving end; the wireless power supply transmitting end and the wireless power supply receiving end both include an electromagnetic induction coil and a conversion circuit connected to the electromagnetic induction coil; The electromagnetic induction coil of the wireless power transmission end is arranged at the end of the stator facing the rotor, and its axis coincides with the stator axis; the electromagnetic induction coil is connected to the power supply through the conversion circuit; The electromagnetic induction coil of the wireless power receiving end is arranged at the end of the rotor facing the stator, and its axis coincides with the axis of the rotor; the electromagnetic induction coil is connected to the fluorescence signal demodulation module through the conversion circuit; and the fluorescence signal demodulation module is powered; The electromagnetic induction coil at the wireless power receiving end and the electromagnetic induction coil at the wireless power transmitting end correspond in position, and wireless power supply from the stator to the rotor is achieved through electromagnetic coupling.

4. A rotor fluorescent optical fiber temperature measurement system according to claim 3, characterized in that: The communication module is an optical communication module, including an optical communication transmitting end and an optical communication receiving end; the optical communication transmitting end and the optical communication receiving end are both provided with a laser and a photodetector; the wavelengths of the laser of the optical communication transmitting end and the laser of the optical communication receiving end are different; the optical communication transmitting end is arranged in the middle of the end face of the rotor facing the stator, and the optical communication receiving end is arranged in the middle of the end face of the stator facing the rotor, and the positions of the two correspond.

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