CN202868662U

CN202868662U - Audio frequency sensor

Info

Publication number: CN202868662U
Application number: CN 201220436718
Authority: CN
Inventors: 陈军; 戴莉
Original assignee: NANJING ENGINE AUTOMATION EQUIPMENT CO Ltd
Current assignee: NANJING ENGINE AUTOMATION EQUIPMENT CO Ltd
Priority date: 2012-08-30
Filing date: 2012-08-30
Publication date: 2013-04-10
Anticipated expiration: 2022-08-30

Abstract

The utility model provides an audio frequency sensor which structurally comprises an annuciator hood, a microphone, a noise source, a base, a membrane, a seal ring, an outer sleeve, an inner sleeve, an upper cover, a control processing plate, an adapter plate, a conversion terminal, an upper clamp plate, a lower clamp plate, a backup ring and a pre-amplifier module. The audio frequency sensor has the advantages of preventing a machine set from stopping operation unplanned, facilitating scheduling of network load, preventing or lightening damage caused by secondary leakage, avoiding mishearing and misinformation phenomena due to a traditional leakage detection method, avoiding potential accidents due to scene inspection tours of operation staff, preventing damaging heating surface pipelines due to failures of a soot blower, shortening rush repair construction period of leakage of furnace pipes, reducing labor intensity, reducing device loss due to secondary leakage, improving utilization ratio of the machine set, monitoring the operating states of the soot blower, facilitating preventive maintenance of a boiler, being applied to a power station boiler of a thermal generator set, detecting early-stage leakage of the heating surface pipelines of furnace inner water cooling walls, a superheater, a reheater and an economizer in real time, and effectively monitoring operation condition of soot blowing.

Description

Acoustic frequency sensor

Technical field

The utility model relates to the acoustic frequency sensor of a kind of sound wave and frequency measurement, belong to thermal technology's electric power observation and control technical field in thermal power plant.

Background technology

Along with the development of generation technology, modern electricity generation boiler has entered large capacity, high parameter epoch, and generator tube quantity is on the increase, and the reliability requirement that is in operation improves constantly.Safety, the economical operation that will directly affect generating set in case occur to leak in generator tube.Therefore, leakage of boiler tubes prevent and to the early detection of leaking with process increasingly important to electricity power enterprise.

Summary of the invention

The utility model proposes a kind of acoustic frequency sensor, its purpose is intended to utilize the acoustic monitoring principle, gathers various acoustical signals in the stove by special enhancement mode acoustic frequency sensor, and converts current signal to; By the analytical calculation of noise intensity, spectrum signature and duration being judged whether boiler tube leaks.

Technical solution of the present utility model: it is characterized in that comprising the signalling means cover, microphone, noise source, base, barrier film, sealing ring, overcoat, inner sleeve, loam cake, the control disposable plates, keyset, conversion terminal, train wheel bridge, lower plate, packing ring, pre-amplifier module, wherein: signalling means cover and inner sleeve are affixed, microphone, noise source and signalling means cover are affixed, inner sleeve is fixed on the base, and by O type circle sealing, loam cake links by inner nut with overcoat, the control disposable plates, conversion terminal puts in being fixed in, pre-amplifier module is welded on the control disposable plates, by communicating conversion terminal 5 pins and extraneous the connection, train wheel bridge docks fixed cable with lower plate, packing ring is by outside hose coupling sealing, and the signal output part of microphone connects the signal input part of the elementary amplifying circuit in the pre-amplifier module.

The utility model compared with prior art has obvious advantage and beneficial effect: this acoustic frequency sensor is the sound Real-time Collection that will send in the boiler confined space, what gather mainly is by airborne sound, normally moving at boiler is that sound concentrates on the medium and low frequency section, sound concentrated on the medium-high frequency section after boiler tube leaked, variation by frequency catches the leakage sound source in real time, judges whether generator tube leaks.Its security benefit comprises: prevent unit stoppage in transit outside the plan, be conducive to the network load scheduling.Prevent or alleviate the destruction that secondary leakage causes.Phenomenon is listened, reported by mistake to the mistake of avoiding traditional leak hunting method to cause.The contingency of avoiding the on-the-spot tour of operations staff to cause.Prevent soot blower fault damage heating surface piping.The economy benefit comprises: shorten the repairing duration that boiler tube leaks, reduce labor intensity.Alleviate the equipment loss that secondary leakage causes.Improve the availability of unit.Monitor the soot blower operating condition, be conducive to improve boiler efficiency.Be conducive to the preventing boiler maintenance.This device is applicable to the station boiler of thermal power generation unit, detects in real time early stage leakage and effective monitoring of water-cooling wall, superheater, reheater, economizer surface pipeline in the stove and blows grey operating condition.

Description of drawings

Fig. 1 is the structural representation of embodiment 1.

Fig. 2 is the A-A cut-away view among Fig. 1.

Fig. 3 is the structure principle chart of knot pre-amplifier module.

Among the figure 1 is the signalling means cover, the 2nd, microphone, the 3rd, noise source, the 4th, base, the 5th, sealing ring, the 6th, overcoat, the 7th, inner sleeve, the 8th, loam cake, the 9th, the control disposable plates, the 10th, keyset, the 11st, conversion terminal, the 12nd, train wheel bridge, the 13rd, lower plate, the 14th, packing ring, the 15th, pre-amplifier module, the 16th, elementary amplifying circuit, the 17th, first order low pass filter, the 18th, the steady device of low frequency regulating constant, the 19th, first order amplifier, the 20th, second level high-pass filter, the 21st, the steady device of high frequency regulating constant, the 22nd, voltage turns current module, the 23rd, autocontrol switch, the 24th, hose coupling, the 25th, A screw (M3X16), the 26th, B screw (M3X35), 27 is O type circles (31.5X3.55), 28 is the 2nd O type circles (61.5X2.65).

The specific embodiment

Contrast accompanying drawing

1,2, its structure comprises signalling means cover 1, microphone 2, noise source 3, base 4, sealing ring 5, overcoat 6, inner sleeve 7, loam cake 8, control disposable plates 9, keyset 10, conversion terminal 11, train wheel bridge 12, lower plate 13, packing ring 14, pre-amplifier module 15, wherein: signalling means cover 1 is affixed with inner sleeve 7, microphone 2, noise source 3 is affixed with signalling means cover 1, inner sleeve 7 is fixed on the base 4, and by an O type circle (31.5X3.55) sealing, loam cake 8 and overcoat 6 link by inner nut, control disposable plates 9, conversion terminal 11 is fixed on the inner sleeve 7, pre-amplifier module 15 is welded on the control disposable plates 9, by communicating conversion terminal (5 pin) 11 and extraneous the connection, train wheel bridge 12 docks fixed cable with lower plate 13, and packing ring 14 is by outside hose coupling sealing.

The connected mode of described microphone 2, noise source 3, control disposable plates 9, keyset 10, conversion terminal 11 bonds together mutually, then uses B screw (M3X35) and glue to be fixed.

Described pre-amplifier module is installed on the control disposable plates, links to each other with keyset by inside cable.

Described signalling means cover puts in being fixed in screw, in put and be provided with the hole, cable passes from this hole.Inner sleeve is screwed on base, and base and loam cake all link by screw thread and overcoat.

Described base, loam cake, overcoat also are that metal material is made.

Contrast accompanying drawing 3, the structure of pre-amplifier module be by elementary amplifying circuit 16 be, first order low pass filter 17 is, the steady device 18 of low frequency regulating constant is, first order amplifier 19, second level high-pass filter 20, the steady device 21 of high frequency regulating constant, voltage turn current module 22, autocontrol switch 23 serial connections form.

During work, microphone 2 gathers sound signal and transfers voltage to by audio frequency, deliver to low pass filter through triode the first amplifying circuit, this effect is that the following sound signal of 200Hz is removed, regulate, stablize by low-frequency level, further removal is amplified by second level amplifier after disturbing sound source, again through the high-pass filter filtration, high-frequency level regulates, stable, turn current module by voltage at last and voltage signal is transferred to current signal deliver to terminal keyset 11.The effect of noise source is the self check that realizes sensor, by the break-make of autocontrol switch control terminal keyset power source test side, makes noise source work produce sound signal and allows the microphone collection, is used for judging whether whole circuit loop is working properly.

Acoustic frequency sensor adopts superior filter circuit and anti-jamming circuit, converts the diversity of settings noise signal in the boiler furnace to current signal, and current signal output is realized leakage warning function.Can also be used for simultaneously the detection to the operation industry control of steam soot blower of boiler.

The soot blower running noises is influential to the source of leaks acoustic signals, because blow the characteristic frequency spectrum section of grey sound and leakage very near (usually having met or exceeded 2Khz, this also is the frequency band that leaks), common introducing is blown grey Inhibitory signal and is solved it to leaking the impact of judging.

1, acoustic frequency sensor can detect any sound in the burner hearth, comprises the background noise that normally blows ash sound, leakage sound, normal operation.System can normally detect sound signal in blowing grey process, if detect leakage signal when blowing ash, then can not send the leakage alarm signal in blowing grey process, finishes the cancellation of after-blow ash Inhibitory signal and will send immediately alarm signal but blow ash.

Throw simultaneously the both sides that when 2, soot blower is speared are symmetry, and previous soot blower moves back free interval between rifle and the javelin of next soot blower, does not have and blow grey, and system's meeting this time of automatic measurement ﹠ calculation and sound auxiliary judgment are leaked.

3, for no matter blowing ash or normal leakage has caused alarm condition, recollecting in leakage has record and shows in the picture, concentrate near the point of arranging superheater and the reheater than comparatively dense if usually blow alarm condition that ash causes, recollect regular following by checking to report to the police.Because acoustic frequency sensor is real-time to the detection of sound, it also is regular that soot blower comes into operation at every turn.Even after blowing ash, send alarm signal, if also please remind operations staff's signal in 1 minute, just to disappear, also belong to and blow that ash causes.

Claims

1. acoustic frequency sensor, it is characterized in that comprising the signalling means cover, microphone, noise source, base, barrier film, sealing ring, overcoat, inner sleeve, loam cake, the control disposable plates, keyset, conversion terminal, train wheel bridge, lower plate, packing ring, pre-amplifier module, wherein: signalling means cover and inner sleeve are affixed, microphone, noise source and signalling means cover are affixed, inner sleeve is fixed on the base, and by O type circle sealing, loam cake links by inner nut with overcoat, the control disposable plates, conversion terminal puts in being fixed in, pre-amplifier module is welded on the control disposable plates, and by communicating conversion terminal 5 pins and extraneous the connection, train wheel bridge docks fixed cable with lower plate, packing ring is by outside hose coupling sealing, and the signal output part of microphone connects the signal input part of the elementary amplifying circuit in the pre-amplifier module.

2. acoustic frequency sensor according to claim 1 is characterized in that described microphone, noise source, control disposable plates, keyset, conversion terminal bond together mutually, and is fixed with B screw and glue.

3. acoustic frequency sensor according to claim 1, the structure that it is characterized in that described pre-amplifier module be by elementary amplifying circuit, first order low pass filter, the steady device of low frequency regulating constant, first order amplifier, second level high-pass filter, the steady device of high frequency regulating constant, voltage turn current module, the autocontrol switch serial connection forms.