CN114441441B - Sulfur hexafluoride gas on-line monitoring system based on TDLAS - Google Patents
Sulfur hexafluoride gas on-line monitoring system based on TDLAS Download PDFInfo
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- CN114441441B CN114441441B CN202111671175.1A CN202111671175A CN114441441B CN 114441441 B CN114441441 B CN 114441441B CN 202111671175 A CN202111671175 A CN 202111671175A CN 114441441 B CN114441441 B CN 114441441B
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- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 51
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 51
- 238000012544 monitoring process Methods 0.000 title claims abstract description 41
- 238000000041 tunable diode laser absorption spectroscopy Methods 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 16
- 239000004065 semiconductor Substances 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 201000004569 Blindness Diseases 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 46
- 238000010586 diagram Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910000530 Gallium indium arsenide Inorganic materials 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000032368 Device malfunction Diseases 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000005935 Sulfuryl fluoride Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- OBTWBSRJZRCYQV-UHFFFAOYSA-N sulfuryl difluoride Chemical compound FS(F)(=O)=O OBTWBSRJZRCYQV-UHFFFAOYSA-N 0.000 description 1
- LSJNBGSOIVSBBR-UHFFFAOYSA-N thionyl fluoride Chemical compound FS(F)=O LSJNBGSOIVSBBR-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/0303—Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/12—Circuits of general importance; Signal processing
- G01N2201/121—Correction signals
Abstract
The application discloses a TDLAS-based sulfur hexafluoride gas on-line monitoring system, which comprises a detection assembly, a detection assembly and a detection assembly, wherein the detection assembly comprises an optical multiple reflection tank, a GIS (gas insulated switchgear) gas pipe joint arranged at the end part of the optical multiple reflection tank, and a semiconductor laser; and the data processing unit comprises a photoelectric detection module, a laser driving and protecting module, a signal processing module and an upper computer module. The application can timely and accurately find the change condition of the gas in the sulfur hexafluoride electrical equipment through the arrangement of the detection assembly and the data processing unit, provides timely and reliable effective data for an overhaul department, ensures the power supply reliability of the sulfur hexafluoride electrical equipment, reduces the power failure times and maintenance blindness of the equipment, can properly prolong the overhaul period to reduce the production cost, enhances the competitiveness and obtains greater economic benefit.
Description
Technical Field
The application relates to the technical field of gas detection, in particular to a TDLAS-based sulfur hexafluoride gas on-line monitoring system.
Background
The sulfur hexafluoride electrical equipment relies on excellent insulation and arc extinction properties of sulfur hexafluoride gas, adopts the sulfur hexafluoride electrical equipment as an insulation and arc extinction medium, and seals all high-voltage electrical components therein by utilizing a grounded metal cylinder. Compared with the traditional open-type power distribution device, the sulfur hexafluoride electrical equipment has the advantages of quick installation, small occupied space, low operation cost, high reliability, difficult environmental interference, no electromagnetic interference, long overhaul period, small maintenance workload and the like. Along with the high-speed development of sulfur hexafluoride electrical equipment, how to ensure the safe operation of the electrical equipment becomes a key link for ensuring the stability of the whole power system. Once it fails, a large power outage may occur in the administered area. As a closed combined structure system, a large amount of manpower and material resources and longer maintenance time are required for power failure maintenance, and great economic loss is brought to society.
A great deal of researches show that more frequent discharge behaviors can also occur in electrical equipment which normally operates, sulfur hexafluoride gas can be decomposed under the influence of factors such as electric arc, corona, spark discharge, partial discharge, high temperature and the like, and decomposed substances react with trace moisture, gas impurities, electrodes and solid insulating materials in the equipment to generate corrosive electrolyte, especially certain highly toxic decomposed substances such as carbon monoxide (CO), thionyl fluoride (SOF 2), sulfuryl fluoride (SO 2F 2), sulfur dioxide (SO 2), hydrogen sulfide (H2S) and the like. As the discharge time is prolonged, the concentration of the derivative is gradually increased, which may cause the insulation performance of the device to be reduced, resulting in the various potential safety hazards described above, and the sulfur hexafluoride derivative is a main cause of the device malfunction. If the on-line monitoring of the sulfur hexafluoride electrical equipment can be successfully realized, the change condition of the gas in the sulfur hexafluoride electrical equipment can be timely and accurately found, the insulation defect of the electrical equipment in operation can be timely found, and accidents are prevented.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the above and/or problems occurring in the prior TDLAS based sulfur hexafluoride gas online monitoring system.
Therefore, the application aims to solve the problem of timely and accurately monitoring the gas change condition in the sulfur hexafluoride electrical equipment.
In order to solve the technical problems, the application provides the following technical scheme: the TDLAS-based sulfur hexafluoride gas on-line monitoring system comprises a detection assembly, a detection module and a detection module, wherein the detection assembly comprises an optical multiple reflection tank, a GIS equipment gas pipe joint arranged at the end part of the optical multiple reflection tank and a semiconductor laser; and the data processing unit comprises a photoelectric detection module, a laser driving and protecting module, a signal processing module and an upper computer module.
As a preferable scheme of the TDLAS-based sulfur hexafluoride gas on-line monitoring system of the application, wherein: the optical multi-reflection cell is a white cell air chamber.
As a preferable scheme of the TDLAS-based sulfur hexafluoride gas on-line monitoring system of the application, wherein: the photoelectric detection module comprises a photodiode and a transimpedance amplifier.
As a preferable scheme of the TDLAS-based sulfur hexafluoride gas on-line monitoring system of the application, wherein: the laser driving and protecting module comprises a direct current bias circuit, a triangular wave generating circuit, a sine wave generating circuit, an adding circuit and a laser driving circuit.
As a preferable scheme of the TDLAS-based sulfur hexafluoride gas on-line monitoring system of the application, wherein: the signal processing module comprises a photoelectric detection component, a filter, a phase-locked amplifier, an A/D converter and a high-performance MCU.
As a preferable scheme of the TDLAS-based sulfur hexafluoride gas on-line monitoring system of the application, wherein: the upper computer module comprises an I2 interface, a USB interface and a GSM interface.
As a preferable scheme of the GIS equipment air pipe joint used by the TDLAS-based sulfur hexafluoride gas on-line monitoring system, the application comprises the following steps: the connecting assembly comprises a socket and a plug arranged in the socket; and the clamping assembly comprises a fastening piece arranged in the socket, a transmission piece arranged on one side of the fastening piece, a fixing piece arranged between the transmission pieces, and a locking piece arranged at the bottom of the transmission piece.
As a preferable scheme of the GIS equipment air pipe joint used by the TDLAS-based sulfur hexafluoride gas on-line monitoring system, the application comprises the following steps: the fastener including set up in the inside inner tube of socket, set up in the dog at top in the inner tube, set up in the first spring of dog tip, set up in the inside movable rod of first spring, set up in the clamping block of inner tube top surface, set up in the first connecting plate at clamping block top, set up in the second connecting plate at socket inner wall top, and set up in second spring between first connecting plate and the second connecting plate, the one end and the dog fixed connection of first spring, the one end and the dog fixed connection of movable rod, the movable rod other end still is provided with first sawtooth. The first connecting plate is fixedly connected with the clamping block, and two ends of the second spring are respectively and fixedly connected with the first connecting plate and the second connecting plate.
As a preferable scheme of the GIS equipment air pipe joint used by the TDLAS-based sulfur hexafluoride gas on-line monitoring system, the application comprises the following steps: the transmission piece is including set up in the first gear of movable rod tip, set up in the rack of first gear other end, set up in the cam of clamp block tip, set up in the pivot of cam bottom, and set up in the second gear of pivot bottom, the rack only has its top part position to be provided with the second sawtooth, cam and second gear all with pivot fixed connection.
As a preferable scheme of the GIS equipment air pipe joint used by the TDLAS-based sulfur hexafluoride gas on-line monitoring system, the application comprises the following steps: the locking piece including set up in the hand pulley of inner tube bottom, set up in limit hook on the inner tube bottom surface, and set up in the third spring of hand pulley bottom, the side surface of hand pulley still evenly is provided with the third sawtooth, the top surface of hand pulley still evenly is provided with spacing tooth, the one end of third spring with the bottom fixed connection of hand pulley.
The application has the beneficial effects that: the application can timely and accurately find the change condition of the gas in the sulfur hexafluoride electrical equipment through the arrangement of the detection assembly and the data processing unit, provides timely and reliable effective data for an overhaul department, ensures the power supply reliability of the sulfur hexafluoride electrical equipment, reduces the power failure times and maintenance blindness of the equipment, can properly prolong the overhaul period to reduce the production cost, enhances the competitiveness and obtains greater economic benefit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a system block diagram of a TDLAS based sulfur hexafluoride gas on-line monitoring system.
Fig. 2 is a schematic diagram of a laser driving circuit of a TDLAS-based sulfur hexafluoride gas on-line monitoring system.
Fig. 3 is a schematic diagram of a laser triangular wave driving circuit of the sulfur hexafluoride gas on-line monitoring system based on TDLAS.
Fig. 4 is a schematic diagram of a laser sine wave driving circuit of a TDLAS-based sulfur hexafluoride gas online monitoring system.
Fig. 5 is a schematic diagram of a laser V/I conversion circuit and driving current collection of a TDLAS-based sulfur hexafluoride gas online monitoring system.
Fig. 6 is a schematic diagram of a light detection part of a TDLAS-based sulfur hexafluoride gas on-line monitoring system.
Fig. 7 is a partial functional block diagram of a signal processing module of the TDLAS-based sulfur hexafluoride gas on-line monitoring system.
Fig. 8 is a functional diagram of an MCU circuit part of a TDLAS-based sulfur hexafluoride gas on-line monitoring system.
Fig. 9 is a functional diagram of an interface circuit of an upper computer module of the TDLAS-based sulfur hexafluoride gas online monitoring system.
Fig. 10 is a diagram showing the whole structure of a GIS equipment air pipe joint of the TDLAS-based sulfur hexafluoride gas on-line monitoring system.
Fig. 11 is a schematic diagram of the inside of a gas pipe joint of a GIS device of a TDLAS-based sulfur hexafluoride gas on-line monitoring system.
Fig. 12 is an oblique cross-sectional view of a gas pipe joint of a GIS device of the TDLAS-based sulfur hexafluoride gas on-line monitoring system.
Fig. 13 is a cam and clamp block mating diagram of a TDLAS based sulfur hexafluoride gas online monitoring system.
Fig. 14 is a diagram showing the cooperation of a limit hook and a limit tooth of the TDLAS-based sulfur hexafluoride gas online monitoring system.
Fig. 15 is an enlarged view of the cooperation of the moving rod and rack of the TDLAS-based sulfur hexafluoride gas online monitoring system with the first gear.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1, a first embodiment of the present application provides a TDLAS-based sulfur hexafluoride gas online monitoring system, which includes a detection assembly 100 and a data processing unit 200. The gas inside the electrical equipment is collected through the detection assembly 100, and then the collected data is analyzed through the data processing unit 200 for real-time monitoring.
Specifically, the detection assembly 100 includes an optical multiple reflection tank 101, a GIS device air pipe joint S disposed at an end of the optical multiple reflection tank, and a semiconductor laser 103. The optical multiple reflection tank 101 is mainly used for collecting and storing gas, the GIS equipment gas pipe joint S is used for quick connection between gas pipes, and the semiconductor laser 103 is used for emitting laser to irradiate the gas.
Preferably, the data processing unit 200 includes a photoelectric detection module 201, a laser driving and protecting module 202, a signal processing module 203, and a host computer module 204. The photoelectric detection module 201 mainly realizes the conversion between photoelectricity, the laser driving and protecting module 202 mainly aims at enabling a laser to work in a linear working area above a threshold current, the signal processing module 203 mainly carries out modulation and demodulation of signals, and the upper computer module 204 mainly realizes data transmission and man-machine interaction.
Example 2
Referring to fig. 2 to 9, a second embodiment of the present application is based on the previous embodiment.
Specifically, the optical multiple reflection cell 101 is a Huai Techi air cell. The air chamber of the white cell is composed of three spherical mirrors with the same focal length, and the purpose of adjusting the optical path can be achieved by adjusting the positions of the incident light spot and the reflection light spot on the field mirror and the two retro-reflectors to change the emission times.
Preferably, the photo detection module 201 includes a photodiode 201a, a transimpedance amplifier 201b. The photodiode 201a is an infrared detector made of InGaAs material, which can operate in a greenhouse, has high quantum efficiency and extremely small dark current in an effective wave band, and can meet most applications. In high precision linear photoelectric conversion, a photovoltaic mode transimpedance amplifier 201b is used to current-voltage convert the photocurrent generated by the detector, under such circuit conditions, the photodiode 201a is not reverse biased, the dark current of the photodiode 201a is very small, typically a few PA, and the dark current characteristics remain substantially constant at constant temperature.
The optical signal current signal is usually small, so the optical signal is usually amplified with a large amplification factor (vout=rf×ip), typically several M ohms, for convenience of subsequent circuit processing. At the same time, the noise current is amplified by the same factor, while the noise voltage is not amplified according to the amplification principle of the transimpedance amplifier 201b. Thus, noise current becomes an important factor affecting the sensitivity of the detector. The detector noise current includes a thermal noise current and a shot noise current.
Noise generated by random fluctuation of light radiation and random fluctuation of photocurrent in the photoelectric device is shot noise, and a square calculation formula of shot current noise Ins is as follows, wherein q is electron charge quantity; i d Photocurrent for a photovoltaic device; Δf is the passband of the operation of the optoelectronic device. From equation (1), it is known that reducing the operating frequency is the most straightforward method of reducing shot noise:
I ns 2 =2qI d ∆f （1）
noise generated in the conductor due to irregular movement of electrons is thermal noise, and any conductor generates thermal noise. The most dominant source of thermal noise within photodetectors is the thermal noise of the junction resistance. Equation (2) and equation (3) are the square values of the thermal noise voltage and the thermal noise circuit. K is Boltzmann coefficient, T is thermodynamic temperature, R is resistance of junction resistance, and Δf is passband of the operation of the optoelectronic device. It can be seen that the larger the junction resistance, the larger the thermal noise voltage, and conversely, the smaller the thermal noise current, the above analysis has been made on the fact that the main current affecting the detection sound, so the larger the junction resistance, the smaller the thermal noise current.
U nd 2 =4KTR∆f （2）
I nd 2 =4KT∆f/R （3）
Therefore, through analysis of the noise performance of the InGaAs photoelectric detector, the smaller the working frequency is, the smaller the noise performance is, so that the noise of the detector can be reduced by adopting modulation with low frequency, and the signal-to-noise ratio of the detector is improved.
Preferably, the laser driving and protecting module 202 includes a dc bias circuit 202a, a triangular wave generating circuit 202b, a sine wave generating circuit 202c, an adder circuit 202d, and a laser driving circuit 202e. The dc bias circuit 202a may be generated by a single, single-channel 14-bit DAC MAX5141 having serial control signal and data signal outputs that directly drive a 60K ohm load without a buffer amplifier. The triangular wave generating circuit 202b may generate a square wave signal through an ADI 8-bit low-cost DAC AD558JN, and then generate a triangular wave signal through an inverse amplifying and low-pass filtering circuit. The sine wave generation circuit 202c generates a sine wave signal by a DDS (direct digital synthesizer) AD9832 of ADI company, and then filters the sine wave signal to obtain a purer sine wave signal. The summing circuit 202d may sum via an ADI company FET input op-amp AD 711.
Preferably, the signal processing module 203 includes a photodetection unit 203a, a filter 203b, a lock-in amplifier 203c, an a/D converter 203D, and a high performance MCU203e. The RC active filter 203b formed by the integrated operational amplifier has the characteristics of high input impedance, low output impedance, capability of providing a certain gain, adjustable cut-off frequency and the like. The aromatic second-order low-pass filter circuit is an important one of the active filter circuits, and is suitable for being used as a cascade of multistage amplifiers. The input of the phase-locked amplifier 203c and the output end of the phase-locked amplifier 203c are both provided with a multistage amplifying circuit based on a aromatic second-order low-pass filtering circuit to filter and rectify the front-stage noise and the rear-stage high-frequency signal of the phase-locked amplifier. The a/D converter 203D is used for converting the analog signal with continuous time and continuous amplitude into the digital signal with discrete time and discrete amplitude, so the a/D conversion generally goes through 4 processes of sampling, holding, quantization and encoding. The application adopts the Ling-Ten 16-bit high-precision high-speed A/D converter LTC1867, the inside of the converter contains a voltage reference of 2.5V, the ADC adopts single 5V power supply, and the maximum absorption current is 1.3Ma. It has 8-way input multiplexing function, can be configured as single-way, differential or bipolar input, has low power consumption mode inside, under the condition of no operation, the method is switched into a low-power-consumption working mode, and is suitable for some power-consumption sensitive applications. The high-performance MCU203e adopts a Feishaeal MC9S12A128CPVE high-performance 16-bit singlechip, and the high-performance 16-bit singlechip comprises a voltage monitoring circuit, an MCU power supply filtering part and a clock generating part.
Further, the upper computer module 204 includes an I2 interface 204a, a USB interface 204b, and a GSM interface 204c. The partial circuit design enables the system to conveniently carry out communication outwards and receive manual key operation of operators.
When the device is used, firstly, gas in sulfur hexafluoride is introduced into the optical multi-reflection tank 101 through the GIS equipment air pipe connector S, the semiconductor laser 103 is started to irradiate the gas, then obtained data are sent to the signal processing module 203, and the signal processing module 203 modulates and demodulates the signal and feeds the signal back to staff through the upper computer module 204.
Example 3
Referring to fig. 10 to 15, a third embodiment of the present application is based on the first two embodiments.
Specifically, the connection assembly 300 includes a socket 301, and a plug 302 disposed inside the socket 301; and the clamping assembly 400 comprises a fastening member 401 arranged in the socket 301, a transmission member 402 arranged on one side of the fastening member 401, fixing members arranged between the transmission members 402, and a locking member 403 arranged at the bottom of the transmission member 402. The socket 301 and the plug 302 are respectively connected with an external air pipe, and the connection can be completed by inserting the socket 301 and the plug 302. The plug 302 and the socket 301 can be tightly connected together by the fastener 401, so that shaking cannot easily occur; the transmission member 402 is used for linking the fastening member 401 and the locking member 403, so that only the locking member 403 is required to be operated to drive the fastening member 401 to lock the plug 302 and the socket 301. The bottom surface of the plug 302 is also uniformly provided with a plurality of projections 301a. The protrusion 301a is integrally formed with the plug 302, and has a bucket shape with a long upper part and a narrow lower part, so that the plug 302 can be conveniently inserted.
Preferably, the fastener 401 includes an inner tube 401a disposed inside the socket 301, a stopper 401b disposed at the inner top of the inner tube 401a, a first spring 401c disposed at an end of the stopper 401b, a moving rod 401d disposed inside the first spring 401c, a clamping block 401e disposed at the top surface of the inner tube 401a, a first connection plate 401e-1 disposed at the top of the clamping block 401e, a second connection plate 401e-2 disposed at the top of the inner wall of the socket 301, and a second spring 401f disposed between the first connection plate 401e-1 and the second connection plate 401e-2, one end of the first spring 401c is fixedly connected with the stopper 401b, one end of the moving rod 401d is fixedly connected with the stopper 401b, and the other end of the moving rod 401d is further provided with a first saw tooth 401d-1. The first connecting plate 401e-1 is fixedly connected with the clamping block 401e, and two ends of the second spring 401f are respectively fixedly connected with the first connecting plate 401e-1 and the second connecting plate 401 e-2. The stop block 401b is symmetrically arranged, the middle part of the stop block is provided with a certain concave part, the shape of the stop block is matched with that of the convex part 302a, and the stop block 401b can horizontally move in a gap at the top of the inner pipeline 401 a. The first spring 401c is a compression spring, and the movement of the stopper 401b is moved following the horizontal movement of the moving lever 401 d. The moving lever 401d is engaged with the first gear 402a through the first serration 401d-1 at the other end thereof. The first connecting plate 401e-1 is fixedly connected with the clamping block 401e, and two ends of the second spring 401f are respectively fixedly connected with the first connecting plate 401e-1 and the second connecting plate 401 e-2. The second spring 401f is a tension spring, and the second spring 401f is in a tension state when the clamping block 401e is clamped.
Preferably, the transmission member 402 includes a first gear 402a disposed at an end of the moving rod 401d, a rack 402b disposed at the other end of the first gear 402a, a cam 402c disposed at an end of the clamping block 401e, a rotating shaft 402d disposed at a bottom of the cam 402c, and a second gear 402e disposed at a bottom of the rotating shaft 402d, wherein only a portion of a top of the rack 402b is provided with a second saw tooth 402b-1, and the cam 402c and the second gear 402e are fixedly connected with the rotating shaft 402 d. Only a portion of the top of the rack 402b is provided with second serrations 402b-1. The rack 402b is engaged with the first gear 402a by the second serration 402b-1 and its position is just offset from the moving bar 401 d. The bottom of rack 402b is "L" shaped, with a portion below hand pulley 403 a. The cam 402c and the second gear 402e are fixedly connected with the rotating shaft 402 d. The cam 402c mates with a protrusion on the clamp block 401e, and when the cam 402c rotates, the position of the clamp block 401e changes. I.e. the clamping and unclamping of the clamping block 401e is directly controlled by the cam 402c and the second spring 401 f.
Preferably, the locking member 403 includes a hand pulley 403a disposed at the bottom of the inner pipe 401a, a limit hook 403b disposed on the bottom surface of the inner pipe 401a, and a third spring 403c disposed at the bottom of the hand pulley 403a, wherein the side surface of the hand pulley 403a is uniformly provided with third saw teeth 403a-1, the top surface of the hand pulley 403a is uniformly provided with limit teeth 403a-2, and one end of the third spring 403c is fixedly connected with the bottom of the hand pulley 403 a. The third serration 403a-1 is engaged with the second gear 402e, and when the hand pulley 403a rotates, the second gear 402e rotates. The limiting hooks 403b are metal elastic pieces and normally are buckled on the limiting teeth 403a-2, so that the hand pulley 403a only allows unidirectional rotation in this state. The third spring 403c is a compression spring, and mainly plays a role in restoring.
In use, the plug 302 is inserted directly into the socket 301 and then the hand pulley 403a is rotated with a finger in the identification direction until it is stationary, indicating that both the plug 302 and the socket 301 have been tightly connected together. In this process, when the bottom of the plug 302 is inserted into the inner pipe 401a, the stopper 401b will clamp the plug 302 under the action of the first spring 401c, so as to ensure the tightness. When the hand pulley 403a rotates, the second gear 402e is driven to rotate, and the second gear 402e drives the rotating shaft 402d to rotate, thereby driving the cam 402c to rotate. The flange end of the cam 402c will clamp the clamping block 401e tightly to the plug 302 after rotating to a certain extent, so as to ensure the stability of the connection. The cooperation of the stop hook 403b and stop tooth 403a-2 on top of the hand pulley 403a allows it to rotate only in one direction, thereby avoiding loosening of the clamp block 401e due to the rotation of the hand pulley 403 a. When the disassembly is needed, only the hand pulley 403a is required to be downwards pulled in the direction shown in the drawing, and at the moment, the downward movement of the hand pulley 403a pulls the rack 402b to move downwards, so that the first gear 402a is driven to rotate, and the moving rod 401d is driven to move to pull the stop block 401b to two sides. At the same time, the hand pulley 403a moves downwards to be separated from the second gear 402e, and the second gear 402e loses the limit, and then the cam 402c also loses the blocking force, so that the clamping block 401e moves to two sides under the action of the second spring 401f, thereby facilitating the smooth pulling-out of the plug 302. The whole device has compact structure and simple operation, and can ensure certain good air tightness under the condition of ensuring stable connection.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.
Claims (6)
1. Sulfur hexafluoride gas on-line monitoring system based on TDLAS, characterized in that: comprising the steps of (a) a step of,
the detection assembly (100) comprises an optical multi-reflection tank (101), a GIS equipment air pipe joint (S) arranged at the end part of the optical multi-reflection tank (101) and a semiconductor laser (103); the method comprises the steps of,
the data processing unit (200) comprises a photoelectric detection module (201), a laser driving and protecting module (202), a signal processing module (203) and an upper computer module (204);
the GIS equipment air pipe joint (S) comprises a connecting assembly (300), wherein the connecting assembly (300) comprises a socket (301) and a plug (302) arranged inside the socket (301); the method comprises the steps of,
the clamping assembly (400) comprises a fastening piece (401) arranged in the socket (301), a transmission piece (402) arranged on one side of the fastening piece (401), a fixing piece arranged between the transmission pieces (402), and a locking piece (403) arranged at the bottom of the transmission piece (402);
the fastener (401) comprises an inner pipe (401 a) arranged in the socket (301), a stop block (401 b) arranged at the inner top of the inner pipe (401 a), a first spring (401 c) arranged at the end part of the stop block (401 b), a moving rod (401 d) arranged in the first spring (401 c), a clamping block (401 e) arranged on the top surface of the inner pipe (401 a), a first connecting plate (401 e-1) arranged at the top of the clamping block (401 e), a second connecting plate (401 e-2) arranged at the top of the inner wall of the socket (301), and a second spring (401 f) arranged between the first connecting plate (401 e-1) and the second connecting plate (401 e-2), one end of the first spring (401 c) is fixedly connected with the stop block (401 b), one end of the moving rod (401 d) is fixedly connected with the stop block (401 b), and the other end of the moving rod (401 d) is further provided with a first saw tooth (401 d-1);
the first connecting plate (401 e-1) is fixedly connected with the clamping block (401 e), and two ends of the second spring (401 f) are respectively fixedly connected with the first connecting plate (401 e-1) and the second connecting plate (401 e-2);
the transmission part (402) comprises a first gear (402 a) arranged at the end part of the moving rod (401 d), a rack (402 b) arranged at the other end of the first gear (402 a), a cam (402 c) arranged at the end part of the clamping block (401 e), a rotating shaft (402 d) arranged at the bottom of the cam (402 c) and a second gear (402 e) arranged at the bottom of the rotating shaft (402 d), wherein the rack (402 b) is only provided with second saw teeth (402 b-1) at a part of the top part of the rack, and the cam (402 c) and the second gear (402 e) are fixedly connected with the rotating shaft (402 d);
the locking piece (403) comprises a hand pulley (403 a) arranged at the bottom of the inner pipe (401 a), a limiting hook (403 b) arranged on the bottom surface of the inner pipe (401 a), and a third spring (403 c) arranged at the bottom of the hand pulley (403 a), third saw teeth (403 a-1) are uniformly arranged on the side surface of the hand pulley (403 a), limiting teeth (403 a-2) are uniformly arranged on the top surface of the hand pulley (403 a), and one end of the third spring (403 c) is fixedly connected with the bottom of the hand pulley (403 a).
2. The TDLAS based sulfur hexafluoride gas online monitoring system of claim 1, wherein: the optical multi-reflection cell (101) is a white cell air chamber.
3. The TDLAS based sulfur hexafluoride gas online monitoring system of claim 2, wherein: the photoelectric detection module (201) comprises a photodiode (201 a) and a transimpedance amplifier (201 b).
4. The TDLAS based sulfur hexafluoride gas online monitoring system of claim 3, wherein: the laser driving and protecting module (202) comprises a direct current bias circuit (202 a), a triangular wave generating circuit (202 b), a sine wave generating circuit (202 c), an adding circuit (202 d) and a laser driving circuit (202 e).
5. The TDLAS based sulfur hexafluoride gas online monitoring system of claim 4, wherein: the signal processing module (203) comprises a photoelectric detection component (203 a), a filter (203 b), a lock-in amplifier (203 c), an A/D converter (203D) and a high-performance MCU (203 e).
6. The TDLAS based sulfur hexafluoride gas online monitoring system of claim 5, wherein: the upper computer module (204) comprises an I2 interface (204 a), a USB interface (204 b) and a GSM interface (204 c).
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| CN114441441A (en) | 2022-05-06 |
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