DK152412B

DK152412B - FORCULATED SOUND MAKING

Info

Publication number: DK152412B
Application number: DK250482A
Authority: DK
Inventors: Per Boerje Fransman
Original assignee: Ekstroems Vaermetek
Priority date: 1980-10-13
Filing date: 1982-06-03
Publication date: 1988-02-29
Also published as: DK152412C; FI71622C; SE8007150L; DK250482A; FI823866L; EP0069741A1; NO152589B; FI71622B; SE425597B; WO1982001328A1; EP0069741B1; FI823866A0; NO821858L; NO152589C

Description

DK 152412 BDK 152412 B

Den foreliggende opfindelse angår en tvangsstyret lydfrembringer til reguleret tilførsel af trykgasimpulser fra en trykgas-05 ledning til en resonator, hvilken lydfrembringer indeholder et ventilorgan, som er koblet til en drivmotor for at blive drevet af denne og derved regulere trykgasimpulsernes afgivelse fra trykgasledningen.The present invention relates to a forced controlled sound generator for controlled supply of compressed gas pulses from a compressed gas line to a resonator which comprises a valve means coupled to a drive motor to be driven by it and thereby regulate the delivery of the compressed gas pulses from the compressed gas line.

Ved at en sådan lydfrembringer er sluttet til et resonansrør TO el ler en anden resonator frembringes lyd med høj intensitetsniveau, og lydens frekvensområde kan varieres ved omdrejningstalregulering, således at der frembringes en højeste lydintensitet i forskellige frekvensområder i modsætning til, hvad der er tilfældet med et såkaldt tilbagekoblet system af kendt art, som ar-15 bejder med forudbestemt frekvens, og hvor trykgasimpulserne tilføres resonatoren ved at ventilorganet, som regulerer trykgasimpulsernes afgivelse fra trykgasledningen, styres af en i resonatoren arrangeret membran.By such a sound generator being connected to a resonant tube TO or another resonator, high intensity level sound is produced and the frequency range of the sound can be varied by speed control, so that a maximum sound intensity is produced in different frequency ranges as opposed to a so-called feedback system of known kind, which works at predetermined frequency, and wherein the pressure gas pulses are supplied to the resonator by the valve means which regulates the delivery of the pressure gas pulses from the pressure gas line by a membrane arranged in the resonator.

Lydfrembringerens anvendelsesområde kan variere, men den 20 er i hovedsagen indrettet til renholdelse af kedler eller andre rum, som gennemstrømmes af støvindeholdende gas. Ved at resonansrørets åbne ende er sluttet til eksempelvis en kedel, kan støvaflejringer på rør, vægge, kanaler og lommer undgås.The scope of use of the sound generator may vary, but it is generally adapted for cleaning boilers or other spaces which are flowed by dust-containing gas. By connecting the resonant tube's open end to, for example, a boiler, dust deposits on pipes, walls, ducts and pockets can be avoided.

Forskellige typer støv og rum samt forskellige tryk (over- el-25 ler undertryk) i rummene kan kræve forskellige frekvensområder for at opnå det bedste resultat, og ved at gøre lydfrembringeren omstillelig til forskellige frekvenser kan der vælges en passende frekvens til det aktuelle støv, hhv. det aktuelle rum.Different types of dust and compartments as well as different pressures (or 25 or underpressures) in the compartments may require different frequency ranges to achieve the best result, and by making the sound generator adjustable to different frequencies, an appropriate frequency can be selected for the current dust, respectively. the current room.

For at opnå forstyrrelsesfri drift af lydfrembringeren og for 30 at muliggøre en nøjagtig regulering af frekvensen er lydfrembringeren ifølge opfindelsen, som er af den ovenfor angivne art, ejendommelig ved det i krav 1 angivne.In order to achieve interference-free operation of the sound generator and to enable accurate control of the frequency, the sound generator according to the invention, which is of the above-mentioned type, is characterized by the one of claim 1.

Til tydeliggørelse af opfindelsen skal en som eksempel valgt udførelse af lydfrembringeren beskrives nærmere i det følgende 35 under henvisning til tegningen, hvor FIG 1 er et sidebillede af en lydgenerator, indeholdende lydfrembringeren ifølge opfindelsen, sluttet til et resonansrør,In order to illustrate the invention, an exemplary embodiment of the sound generator is described in more detail below with reference to the drawing, in which: FIG. 1 is a side view of a sound generator containing the sound generator according to the invention connected to a resonant tube,

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2 og hvor lydgeneratoren er indrettet til renholdelse af et rum og er vist med et til lydgeneratoren sluttet trykluftsystem, FIG 2, et aksialt snitbillede af lydgeneratorens ene ende med den dertil tilsluttede lydfrembringer, og 05 FIG 3 og 4, snitbilleder efter linien A - A i FIG 2, som viser to forskellige varianter af lydfrembringeren.2 and wherein the sound generator is arranged for cleaning a room and is shown with a compressed air system connected to the sound generator, FIG. 2, an axial sectional view of one end of the sound generator with the associated sound generator, and FIGS. 3 and 4, sectional views along the line A - A. in FIG. 2 which shows two different variants of the sound generator.

Lydgeneratoren består af et resonans rør 1 med en åben ende 2 og en lukket ende 3 og med en lydfrembringer 4 til tvangssty-. ret tilførsel af trykgas til resonans rørets lukkede ende. Resonans-10 rørets længde svarer på det nærmeste til en kvart bølgelængde for den lyd, som skal frembringes i lydgeneratoren. Lydgeneratoren er sluttet til trykgas, eksempelvis komprimeret luft, ved en rørstuds 5, og trykgassen presses stødvis ud i resonansrøret ved hjælp af et mekanisk styret ventilarrangement i lydfrembringeren, 15 hvorved det opnås, at der skiftevis åbnes og lukkes for trykgassen. Det mekanisk styrede ventilarrangement drives med en drivindretning 6, som kan være elektrisk, hydraulisk eller pneumatisk og er vist bestående af en elektrisk motor. Med den mekaniske styring af luftstødene kan frekvensen ændres ved at forøge eller for-20 mindske hastigheden for ventilarrangementets vekslen mellem åben og lukket tilstand, idet hastigheden afpasses efter bølgelængden i resonansrøret 1 med henblik på opnåelse af optimal lydeffekt.The sound generator consists of a resonant tube 1 with an open end 2 and a closed end 3 and with a sound generator 4 for forced control. right supply of compressed gas to the closed end of the resonant tube. The length of the resonance-10 tube corresponds almost to a quarter of a wavelength for the sound to be produced in the sound generator. The sound generator is connected to compressed gas, for example compressed air, at a pipe nozzle 5, and the compressed gas is pushed out in the resonant tube by means of a mechanically controlled valve arrangement in the sound generator, which results in alternately opening and closing the compressed gas. The mechanically controlled valve arrangement is driven by a drive device 6 which can be electric, hydraulic or pneumatic and is shown consisting of an electric motor. With the mechanical control of the air shocks, the frequency can be changed by increasing or decreasing the velocity of the valve arrangement between open and closed states, adjusting the speed to the wavelength of the resonant tube 1 for optimum sound power.

Ventilarrangementet indeholder en til rørstudsen 5 sluttet indløbskappe 7, som forløber ind i lydfrembringerens 4 lukkede cy-25 lindriske hus 8, der står i forbindelse med resonansrøret 1 og danner dettes lukkede ende 3, idet husets indre udgør en del af resonansrørets indre. Indløbskappen 7 forløber diametralt gennem huset 8 og befinder sig i aksial afstand fra den lukkede ende 3. Denne afstand skal dimensioneres efter forholdene i det enkelte tilfælde 30 med henblik på opnåelse af den bedst mulige lydintensitet indenfor det frekvensområde, hvori lydgeneratoren skal arbejde.The valve arrangement includes an inlet sheath 7 connected to the pipe nozzle 5 which extends into the closed cylindrical housing 8 of the sound generator 4, which communicates with the resonant tube 1 and forms its closed end 3, the housing of which forms part of the interior of the resonant tube. The inlet sheath 7 extends diametrically through the housing 8 and is at axial distance from the closed end 3. This distance must be dimensioned according to the conditions in each case 30 in order to obtain the best possible sound intensity within the frequency range in which the sound generator is to operate.

På indløbskappen er et ventilhylster 9 drejeligt lejret ved hjælp af kuglelejer 10, og en lille spalte på nogle tiendedele mm er indrettet imellem ydersiden af indløbskappen 7 og indersiden 35 af venti I hylsteret 9. Ved at lejringen er frembragt ved hjælp af kuglelejer kan den fornødne smøring ske uden at olie eller fedt kommer i kontakt med luftrummet. Ventilhylsterets ene ende er til-On the inlet sheath, a valve sleeve 9 is pivotally mounted by ball bearings 10, and a small gap of some tenths of mm is arranged between the outside of the inlet sheath 7 and the inside 35 of the vent in the sheath 9. By means of the bearing it can be produced by means of ball bearings. Lubrication is done without oil or grease coming into contact with the airspace. One end of the valve sleeve is closed.

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3 lukket ved hjælp af et påskruet låg 11, og den anden ende er forbundet med motorens 6 drivflange 12 ved hjælp af stifter 13. Ventilhylsteret 9 har to diametralt modstående åbninger i form af ak-siale slidser 14 og indrettet til at virke sammen med en åbning i 05 form af en aksial slids 15 i indløbskappen, eksempelvis som vist i FIG 3, men venti I hylsteret kan også have en enkelt åbning 14', indrettet til at virke sammen med slidsen 15, som vist i FIG 4. Lyd-frembringeren har et ubegrænset frekvensområde, eftersom dette kan vælges dels ved at slidserne 14, hhv. slidsen 14' i ventilhyl-10 steret og slidsen 15 i indløbskappen tilpasses til en passende resonator, og dels ved at omdrejningstallet for ventil hyl steret 9 reguleres.3 is closed by means of a screwed-on lid 11 and the other end is connected to the drive flange 12 of the motor 6 by means of pins 13. The valve casing 9 has two diametrically opposed openings in the form of axial slots 14 and arranged to cooperate with a opening in the form of an axial slot 15 in the inlet casing, for example, as shown in FIG. 3, but the venti casing may also have a single opening 14 'adapted to cooperate with the slot 15, as shown in FIG. 4. The sound generator has an unlimited frequency range, since this can be selected partly by the slots 14, respectively. the slot 14 'in the valve sleeve 10 and the slot 15 in the inlet case are adapted to a suitable resonator, and partly by regulating the speed of the valve sleeve 9.

Under praktiske afprøvninger har man fundet, at renholdelse af eksempelvis kedler kan ske med frekvenser op mod 400 Hz, men 15 kan ske endnu bedre med frekvenser ned mod 20 Hz. Med korrekt tilpasset resonator kan der frembringes infralyd langt under 20During practical tests it has been found that cleaning of boilers, for example, can be done with frequencies up to 400 Hz, but 15 can be done even better with frequencies down to 20 Hz. With properly tuned resonator, infrared sound can be generated well below 20

Hz. Uden resonator kan der ikke frembringes nogen lyd med høj intensitet, men opfindelsen muliggør, at man med lydfrembringeren frembringer høj lyd med forskellige frekvenser i samme resona- 20 tor. For det nævnte frekvensområde fra omkring 20 Hz og nedad (infralyd) har man fundet empirisk, at slidsen 15 bør have et are- 2 al, som er mindst 400 mm , at slidsens bredde (udstrækning i indløbskappens 7 periferiretning) bør være maksimalt 8 mm, og at slidsens længde (udstrækning i indløbskappens 7 aksiale ret-25 ning) bør ligge imellem 6 og 25 gange slidsens bredde.Hz. Without a resonator, no high-intensity sound can be produced, but the invention enables the sound-maker to produce high-noise at different frequencies in the same resonator. For the mentioned frequency range from about 20 Hz downwards (infrared), it has been empirically found that the slot 15 should have an area of at least 400 mm, that the width of the slot (extension in the circumferential direction of the inlet shaft 7) should be a maximum of 8 mm. and that the length of the slot (extending in the axial direction of the inlet shaft 7) should lie between 6 and 25 times the width of the slot.

Som det vil ses, bliver slidsen 15 i indløbskappen 7 skiftevis frilagt og tillukket ved hjælp af venti I hyl steret 9, når dette roteres ved hjælp af motoren 6 med henblik på afgivelse af trykluftstød til resonansrøret 1, imod hvis indre slidsen 15 er rettet.As will be seen, the slot 15 in the inlet casing 7 is alternately exposed and closed by the vent 9 of the sleeve 9 as it is rotated by the motor 6 for delivering compressed air shock to the resonant tube 1 against if the inner slot 15 is directed.

30 Under lydfrembringerens drift findes der mellem ventilhylste rets 9 dækkede del og indløbskappen 7 et luftlag, der tjener som friktionsbeskyttelse og forhindrer slitage ved at materialerne i kappen og hylsteret ikke berører hinanden. Luftlaget frembringer desuden køling af materialet. Til indvendig køling af resonansrøret 1 35 kan der eventuelt tilføres luft eller kølevand til resonansrørets indre igennem en ledning 16.30 During the operation of the sound generator, a portion of the cover of the valve sleeve 9 and the inlet sheath 7 is provided with an air layer which serves as friction protection and prevents wear and tear by the materials in the sheath and the casing not touching each other. The air layer also produces cooling of the material. For internal cooling of the resonant tube 1 35, air or cooling water may optionally be supplied to the interior of the resonant tube through a conduit 16.

I FIG 1 vises lydgeneratoren ophængt i en loftbjælke 17 ved 4In FIG. 1, the sound generator is shown suspended in a ceiling beam 17 by 4

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hjælp af kæder eller wirer 18, fortrinsvis forsynet med vibrationsdæmpende elementer, og resonansrøret 1 forløber igennem en væg 19 og til et rum nedenfor væggen, som skal holdes rent ved udsendelse af lavfrekvent lyd (infralyd) i rummet. Resonansrøret bør 05 ikke være stukket længere ind i dette rum, end at afstanden til en modstående flade overfor resonansrørets åbne ende 2 - en sådan flade er markeret med en stiplet linie 20 - er mindst 0,5 m. Rørstudsen 5 er sluttet til en trykluftledning 21, der i det mindste tættest ved lydgeneratoren udgøres af en slange, og som forbinder 10 lydfrembringeren med en passende trykluftkilde (kompressor).by means of chains or wires 18, preferably provided with anti-vibration elements, and the resonant tube 1 extends through a wall 19 and to a space below the wall, which must be kept clean by transmitting low frequency (infrared) sound into the room. The resonant tube 05 should not be inserted further into this space than the distance to an opposing surface opposite the open end 2 of the resonant tube - such a surface marked by a dashed line 20 - is at least 0.5 m. The tube nozzle 5 is connected to a compressed air line 21, which is at least closest to the sound generator constituted by a hose and which connects the sound generator to a suitable compressed air source (compressor).

Trykluftledningen 21 er forsynet med en afspærringsventil 22, et konventionelt filter 23 og en magnetventil 24, hvorover der er indrettet en snæver shuntledning 25. Magnetventilen 24 er koblet til elnettet igennem en automatik 26, hvori der indgår en timer til at 15 åbne magnetventilen 24 med forudbestemte intervaller, som er regulerbare med hensyn til størrelse, samt en anden timer til bestemmelse af den periode - også regulerbar med hensyn til størrelse - hvori magnetventilen skal holdes Iben ved hver åbning. Uanset om magnetventilen er åben eller ej, passerer trykluft til lydgene-20 ratoren igennem shuntledningen 25, forudsat, naturligvis, at afspærringsventilen 22 er åben, hvilket den skal være, men dog ikke under eftersyn af lydgeneratoren eller når denne af anden anledning er taget ud af drift, men luftstrømningen igennem shuntledningen er kun en ringe brøkdel af strømningen igennem magnetventilen 25 24, når denne er åben.The compressed air line 21 is provided with a shut-off valve 22, a conventional filter 23 and a magnetic valve 24, over which is arranged a narrow shunt line 25. The solenoid valve 24 is connected to the mains through an automatic 26, which includes a timer for opening the solenoid valve 24 with predetermined intervals that are adjustable in size, and another timer for determining the period - also adjustable in size - in which the solenoid valve must be kept lined at each opening. Regardless of whether the solenoid valve is open or not, compressed air passes to the sound generator through the shunt line 25, provided, of course, that the shut-off valve 22 is open, which it should be, but not under the care of the sound generator or when it is removed for any other reason. of operation, but the air flow through the shunt conduit is only a small fraction of the flow through the solenoid 25 when open.

Motoren 6 er sluttet til elnettet igennem en indstillelig regulator 27, som muliggør, at motorens omdrejningstal indreguleres på en ønsket værdi, og at frekvensen for den i lydgeneratoren frembragte lyd dermed reguleres. Denne regulator kan eventuelt være 30 koblet til en føler, som afføler frekvensen for den frembragte lyd og justerer indstillingen af regulatoren med henblik på opretholdelse af lydens frekvens på en i hovedsagen konstant værdi.The motor 6 is connected to the mains through an adjustable regulator 27, which allows the engine speed to be adjusted to a desired value and thus the frequency of the sound generated in the sound generator is regulated. This controller may optionally be coupled to a sensor which senses the frequency of the output produced and adjusts the setting of the controller in order to maintain the frequency of the audio at a substantially constant value.

Det er hensigtsmæssigt, at motoren 6 holdes kontinuerligt i gang, også i intervaller mellem magnetventilens 24 åbningsperio-35 der, og ved at der i disse intervaller tilføres en ganske vist svag luftstrøm til lydfrembringeren, hvilken luftstrøm ikke er tilstrækkelig kraftig til at frembringe lyd i lydgeneratoren, nemlig den 5It is preferable that the motor 6 be continuously operated, also at intervals between the opening periods of the solenoid valve 24, and in these intervals a admittedly weak air flow is supplied to the sound generator, which air flow is not sufficiently powerful to produce sound in the the sound generator, namely the 5th

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luftstrøm, som passerer gennem den snævre shuntledning 25, sker der en køling af lydfrembringeren i disse intervaller samtidig med at lydfrembringerens funktionelle elementer holdes rene for eventuelt støv, der ellers kan spredes til lydfrembringeren fra rummet 05 nedenfor væggen 19 igennem resonansrøret 1.air flow passing through the narrow shunt line 25, the sound generator is cooled at these intervals while keeping the sound generator's functional elements clean of any dust that might otherwise be spread to the sound generator from room 05 below wall 19 through resonant tube 1.

10 15 20 25 30 3510 15 20 25 30 35

Claims

Forced controlled sound generation, especially for the infrared range, for controlled supply of compressed gas pulses from a compressed gas line (7) 05 to a resonator (1) / preferably for cleaning boilers or the like, which generates a valve member (9) coupled to a drive motor (6) to be driven therefrom and thereby regulate the delivery of the compressed gas pulses from the compressed gas line (7), characterized in that the valve means is a coaxially arranged valve casing (9) arranged on each end of the compressed gas line (9) on which the pressure gas line by means of roller bearings (10), and has one or more openings (14,14 ') / arranged to cooperate with one or more openings (15) in the pressure gas line during the rotation of the valve sleeve, and the AT resonator (1) is made up of a resonant tube whose length substantially corresponds to a quarter of a wavelength of the sound produced in the sound generator.

2. Forced control audio output according to claim 1, characterized by

A gap is arranged between the compressed gas line (7) and the valve casing (9) which is rotatably mounted thereon.

Compulsory controlled sound generating according to claim 1 or 2, characterized in that the valve housing (9) has an opening (141) which is dimensioned with respect to the opening (15) in the compressed gas line (7) in order to achieve maximum sound intensity. to 50% of the opening or closing time of low frequency sound production.

4. Controlled audio output according to any one of claims 1-3, characterized in that the openings (14,14 'or 15) in the valve housing (9), respectively. in the pressurized gas line (7) are arranged as elongated slots.

5. Forced-controlled sound generation according to claim 4, characterized by

35 The slot (15) in the compressed gas line (7) has an area of at least 400? mm, the width of the slot a maximum of 8 mm, and the length of the slot is from 6 to 25 times the width of the slot. DK 152412B

Compulsory controlled sound generation according to any one of claims 1-5, characterized in that the compressed gas line (7) with the then rotatably mounted valve sleeve (9) runs diametrically in a cylindrical housing (8) connected to the resonator (1) and communicates with its interior and closes the resonator at its closed end (3).

The forced controlled sound generator according to claim 6, characterized in that the compressed gas line (7) and the rotatably mounted valve casing (9) are at axial distance from the closed end (3) formed by the housing (8) on the resonator (1).

Compulsory controlled sound generating according to claim 6 or 7, characterized in that the drive motor (6) is arranged with its drive shaft connected to the valve housing (9), extending coaxially with the compressed gas line (7) and venti in the housing (9). 20 25 30 35