CN2055066U

CN2055066U - Infrasonic and low-frequency sonic generator

Info

Publication number: CN2055066U
Application number: CN 89200617
Authority: CN
Inventors: 郑平
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-01-18
Filing date: 1989-01-18
Publication date: 1990-03-28

Abstract

The utility model discloses an infrasonic and low-frequency sonic generator, which is composed of an electric motor, a clamping ring, an energy exchanging cavity shell, a nozzle, a door, etc. Making use of the method of using air-stream to carry wave, the utility model obtains a sound pressure level higher than existing international like technology, and obtains sound waves with more higher powers. The utility model is not only very convenient for rebuilding the existing boiler, but also is able to be taken as the important component of a new boiler, and is applicable for removing the deposited dust and slag on the surfaces of various heat exchangers in the burning chamber and the flue of a boiler.

Description

Infrasonic and low-frequency sonic generator

Infrasound can improve the efficient of boiler, fuel savings in order to remove dust stratification and the slagging scorification on the various exchanger surfaces in boiler furnace and the flue.

Swede's Mancur Olson has obtained United States Patent (USP) (U.S.Patent4,359,962 Nov.23,1982) in nineteen eighty-two with the technology of infrasound boiler ash removal.1986 again at " Journal of Low frequency noise and Vibration---V5, N1,1986 " delivered and use infrasound and remove dust stratification and slagging scorification on each heat-exchanger surface of boiler, and with the paper of low-frequency sound wave dedusting on textile.These are exactly the current technology that has become commodity in the world.Its United States Patent (USP) and paper are attached to the back.

This infrasonic sound and low-frequency sound generator are the energy with the low-pressure air, and the characteristics of oneself are arranged on principle and structure.Please see accompanying drawing, generator is by motor 1, trim ring 2, transducing cavity shell 3, and nozzle 4, door 5 and air intake joint 6 are formed.Compressed air enters generator from joint 6, through the eccentric orfice of door 5, from nozzle 4 ejections, sends into the combustion chamber and the flue of boiler again.When needs infrasound or low-frequency sound wave, actuating motor 1, door 5 is rotation thereupon, and the size of periodic variation nozzle 4 inlet areas makes the air-flow carrier wave produce sound wave, goes from the outlet width of cloth ejaculation of nozzle 4.Select the rotating speed of motor, change the quantity of door 5 eccentric orfices, change area, shape and the position of door 5 eccentric orfices and nozzle 4 inlets, can obtain the sound wave of various frequencies and waveform.Change the pressure and the flow of air, then can obtain the sound wave of different sound pressure levels and acoustical power.

Experiment showed, that this generator has high conversion efficiency, can obtain infrasonic sound and the low-frequency sound wave of high strength (180db) and high-power (more than the 1kw).Its frequency of infrasound that recommendation is used to remove boiler hot exchanger surfaces dust stratification and slagging scorification is 10～20Hz, and sound pressure level is 125～140db, and acoustical power calmly can be from tens of watts until more than 1 kilowatt on the size of boiler.

Under infrasonic effect, in whole combustion process, can keep each heat-exchanger surface cleaning of boiler ashless.Because infrasonic omni-directional, the dead angle dust stratification all can be eliminated.With traditional mechanical ashing method, steam ash blowing method, and the compressed air soot-blowing method compares, and has tangible technical economic benefit.

This acoustic generator is compared with the existing similar technology in the world, and its remarkable advantage has: one, have higher sound pressure level and bigger acoustical power; Two, make the cumulative volume of boiler ash removal device dwindle about two, thirtyfold; Three, simple in structure, with low cost, not only the utmost point is convenient to reequip used boiler, and can be used as the part of new-type boiler.

Claims

1, make the energy with compressed air, in the combustion chamber and flue of boiler, input infrasound or low-frequency sound wave, in order to the dust stratification and slagging scorification of removing heat-exchanger surface or the sonic generator that helps coal combustion, a motor 1 is arranged, the door 5 that rotates by Motor Drive and near the nozzle 4 of door 5, it is characterized in that door 5 is by SIN function, or periodically open and close the inlet latus rectum of nozzle 4 near the rule of SIN function, make the compressed air miscarriage give birth to infrasonic sound or low-frequency sound wave.

2, infrasonic sound according to claim 1 and low-frequency sound generator is characterized in that: one, on the door 5 of rotation an eccentric orfice is arranged, the hole is cut in the pivot of door 5; Two, nestle up door 5 vertically a nozzle 4 is arranged, eccentric orfice equal and opposite in direction on the ingate of nozzle 4 and the door 5,4 ingate also is cut in the pivot (promptly also being cut in the pivot of motor 1) of door 5 simultaneously.