US3192986A - Pulse jet burner - Google Patents

Pulse jet burner Download PDF

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Publication number
US3192986A
US3192986A US321134A US32113462A US3192986A US 3192986 A US3192986 A US 3192986A US 321134 A US321134 A US 321134A US 32113462 A US32113462 A US 32113462A US 3192986 A US3192986 A US 3192986A
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Prior art keywords
space
combustion chamber
shell
compartment
soundproofing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US321134A
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English (en)
Inventor
Haag Franz
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Junkers and Co GmbH
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Junkers and Co GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C15/00—Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
    • F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/0005—Details for water heaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
    • F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel

Definitions

  • the present invention relates to apparatus for heating fluids, such as water or air, and more particularly to an improved pulse jet burner which may be used in such apparatus as a means for generating heat energy.
  • Water and air heaters which comprise one or more pulse jet burners (also called resonance duct burners) are known in the art. Such burners must be absolutely airtight to prevent escape of combustion products into the surrounding atmosphere. Furthermore, it is equally important to reduce the noise to a bearable level so that a heater embodying one or more pulse jet burners may be used in homes without being a source of irritation to the occupants. lt must be borne in mind that a pulse jet burner operates at elevated pressures and that, in the absence of any soundprooiing, the noise might reach an undesirable level. Heretofore, the noise was combatted by large quantities of expensive sound absorbing material but, to my knowledge, the results obtainable with such material were quite unsatisfactory.
  • Another object of the invention is to provide a pulse jet burner of the just outlined characteristics which is constructed and assembled with a view to prevent escape of any noxious gases into the surrounding atmosphere, which is of very compact and space-saving design, which may be used in room heating and/or water heating systems, and wherein each noise-generating element or component is shieldedV by at least one silencer.
  • a further object of the invention is to provide a novel soundprooiing or silencing arrangement for the combustion chamber and for the resonance duct of a pulse jet burner.
  • a duid heating apparatus which comprises a pulse jet burner and heating pipe means arranged to convey fluid to be heated into an inner soundproong space so that the fluid may exchange heat with one or more combustion chambersV which are accommodated in the soundprooing space.
  • the pulse jet burner comprises an outer shell which deiines an outer Soundproong space, an inner shell which is surrounded by the outer soundproofing space and which deiines the inner soundprooiing space, at least one combustion chamber mounted in the inner shell so as to be at least partially surrounded by the inner soundproong space, suction duct means arranged to deliver a mixture of oxygen and fuel into the combustion chamber so that the mixture is combusted and heats the chamber when the burner is in operation, and resonance duct means arranged to convey from the combustion chamber spent gases which develop on combustion of the mixture.
  • the outer shell has an inlet which admits oxygen or oxygen-containing air into the outer soundprooiing space
  • the inner shell is provided with port means through which oxygen or oxygencontaining air is drawn into the inner soundproofing space to enter the open intake of the suction duct means and to be mixed with fuel which is delivered by a supply conduit extending through the shells and into the inner soundproofing space.
  • FIG. l is a central vertical section through a fluid heating apparatus including a pulse jet burner which embodies one form of my invention
  • FIG. la is a fragmentary central Vertical section through a slightly modied pulse jet burner
  • FIG. 2 is a horizontal section as seen in the direction of arrows from the line lI-Il of FIG. l and illustrates the upper portion of a two-piece partition which is located below the discharge end of the resonance duct;
  • FIG. 3 is a horizontal section as seen in the direction of arrows from the line llI--lll of FIG. l and illustrates the lower portion of this partition;
  • FIG. 4 is a horizontal section as seen in the direction of arrows from the line IV--IV of FIG. 1 and illustrates the construction of the lowermost part'of the inner shell; and Y FIG. 5 is a perspective view of the lower portion of the inner shell with the cylindrical wall partially broken away.
  • a fluid heating apparatus including a pulse jet or resonance duct burner whose combustion chamber lll serves to heat a continuous stream of fluid (e.g., water or air) which is conveyed through a delivery pipe 25.
  • the fluid flows through a heating pipe 27 which is coiled around the combustion chamber 16 and the thus heated fluid is thereupon led away through an evacuating pipe 26; While iiowing through the convoluted heating pipe 27, the fluid exchanges heat with the wall of the chamber 1l) which is heated on explosion of gaseous or pulverulent fuel admitted through a supply conduit 13.
  • This supply conduit 13 discharges into a suction duct 11 which communicates with the upper end of the chamber 1t) and whoseV open intake sucks oxygen or oxygen-containing air from an upper compartment 14 deiined by the upper portion of an inner housing or shell 15 when the burner is in operation.
  • the combustion chamber 10 is accommodated in the compartment 14 and is spaced from the walls of the inner shell 15. The latter is provided with a rst sealed opening 23 for the supply conduit 13 and with two additional sealed openings 24, 24a for the pipes 25, 26.
  • the combustible mixture which is formed in the suction duct 11 enters the interior of the combustion chamber 10 and is exploded in rapid sequence.
  • a sound wave and a column of spent gas will travel down a tail pipe or resonance duct 12 which extends through a sealed opening 29 provided in a horizontal partition 21 located in a plane which is perpendicular to the axis of the inner shell 15 and serving to separate the upper compartment 14 from a lower compartment 20.
  • the operation of the pulse jet burner is well known in the art and by itself forms no part of my invention.
  • the upper compartment 14 in the inner shell 15Vcon-V stitutes a first soundprooiing or silencing space of the improved pulse jet burner, and this space is surrounded by a second soundproofing or silencing space 19 defined by an outer housing or shell 16 which surrounds the inner shell.
  • the inner shell 15 Vassumes the form of an upright cylinder whose walls are spaced from the Walls ofthe outer shell so that the outer soundprooiing space 19 surrounds the ⁇ entire inner shell.
  • the interior of the inner shell l5 accommodates not only the combustion chamber lil but also the convoluted heating pipe 27, the suction duct 11, a portion of the supply conduit 13, and the resonance duct 12.
  • the open end of the resonance duct 12 discharges into the lower compartment 2! whence the spent gas advances into a take-olf pipe 2S in a manner to be described in connection with FGS. 2 to 5.
  • the outer shell 16 comprises a cupped front section 17 which is detachably but sealingly secured to a panshaped rear section 1 by an elastic coupling 3u disposed in a vertical plane and serving to permit expansion or contraction of the outer shell depending on the momentary pressure in the outer ⁇ shell soundprooling space 19.
  • the sealing action may be provided by an annular gasket 39a.
  • the just described construction of the outer shell 16 is oF particular importance when the burner is started or when the operation o the burner is not entirely satisfactory.
  • a combustible mixtureV of fuel and oxygen will penetrate into the outer soundproofing space 19 and might even explode to send a column of spent gas into the surrounding atmosphere.
  • Such gas could escape through the inlet were it not for the teature that the outer shell 1.6 may expand to compensate for variations in pressure prevailing in the space 11.
  • the same result can be achieved by mounting the gasket 3tlg in such a way that it opens a path for escape of fluid into the surrounding atmosphere when the pressure prevailing in the space 19 reaches an undesirably high magnitude.
  • the material et the shells l5, te may be comparatively thin to reduce the cost and the weight of the burner.
  • the interior of the inner shell l5 actually several distinct soundprooi'ing or silencing spaces Vone of whichV (the upper compartment 14) absorbs noise which develops when the mixture of uel and air is drawn into and through the suction duct 1l and the other of which (the lower compartment 2i?) absorbs noise which develops when columns or spent gas are discharged through the resonance duct 12.
  • V the upper compartment 14
  • the lower compartment 2i absorbs noise which develops when columns or spent gas are discharged through the resonance duct 12.
  • the partition 21 is located at a level slightly below the discharge opening of the combustion chamber il?, i.e., somewhat below the intake end of the resonance duct 12.
  • the partition 21' may be coplanar with the bottom wallof the combustion chamber 19 so that the entire resonance duct 12 is located in the lower compartment 2G.
  • the lowermost convolution of the heating pipe 27 extends substantially diametrically across the interior of the combustion chamber lit so that the fluid flowing through the evacuating pipe 26 is heated to a very high temperature. Such heating is enhanced by fins or ribs 27a provided on the lowermost convolution ofthe pipe 27.
  • the compartment 14 communicates with the space 19 through a connecting port 22 which is provided in the top wall of the inner shell 15, and the rear section 18 of the outer shell 16 is formed with an air-admitting inlet 31 which delivers air into the space 19 whence the air may ow into the compartment 14 via port 22 to enter the open intake of the suction duct 11.
  • the rear section 18 of the outer shell 16 is further formed with a irst sealed opening 32 for the supply conduit 13, with a pair of sealed openings 34, 34a for the pipes 25, 26, and with a fourth sealed opening 33 for the take-oft pipe 2S.
  • the improved burner comprises a further soundproofing compartment or space 55 in the lowermost part of the inner shell 15 which is sealed from the compaitment 26 by a horizontal partition 35 whose component parts are illustrated in FIGS. 2 and 3.
  • the partition 35 deiines an annular channel 36 which conveys spent gas into an annular soundproofing space 37 extending between the partition 35 and the bottom Wall of the inner shell 15.
  • the lower portion of this annular space 37 communicates with the intake end of the take-off pipe 28 which extends, through the bottom wall of the inner shell 15, through the lower part of the space 19 and through the sealed opening 33.
  • the partition 35 comprises an upper disk-shaped portion 41 which is shown in FIG. 2 and whose underside is provided with an annular depression or groove 43 of semicircular cross section.
  • the portion 41 is formed with one or more apertures 46 enabling spent gas to ow from the compartment 2 into the channel 36.
  • the lower disk-shaped portion 42 of the partition 35 is illustrated in FG. 3, and the upper side of this lower portion is provided with an annular depression or groove 44 which registers with the groove 43 so that the two grooves together the aforementioned annular channel 36 which is of circular cross section.
  • the second portion 42 is further provided with one or more apertures 47 permitting spent gas to dow into the annular space 37.
  • the aperires 46, 47 shown in FGS.
  • the aperture 47 is 4located at a level above an enlarged portion 43 of the space 36 (see FIGS. 4 and 5) whose major portion 49 is bounded by two bodies of suitable sound absorbing material including a solid cylindrical inner body 51 and a hollow cylindrical outer body 51a
  • the space 37 further comprises a second enlarged portion 5t) which extends upwardly from the intake end of the take-oil pipe 2S.
  • the inner and outer sides of the entire annular space 37 are bounded by perforated metallic sheets 54 best shown in FIG. 5.
  • the noise produced by spent gas discharged from the resonance duct 12 is reduced to acceptable level while the gas must pass through the aperture 46 into the channel 36, thereupon into the annular space 37 via aperture 47, and finally into and through the take-oft pipe 28.
  • the supply conduit 13 comprises two enlarged portions 52 and 53 one of which is outwardly adjacent to the outer shell 16 and the other of which is located in the compartment 14 close to the section ductll.
  • the enlarged portions 52, 53 and the intermediate portion 13a between these enlarged portions define a further soundprooting or silencing space.
  • the operation of the burner will be brought to a standstill if the leak in the combustionV chamber is large enough to reduce the percentage of oxygen in the combustible mixture below a minimum value.
  • the inner shell 16 may accommodate two or more combustion chambers and an equal number of suction ducts and resonance ducts without in any way departing from the spirit of my invention.
  • a twin combustion chamber which may be used in the pulse jet burner of the present invention is disclosed in my copending application Serial No. 212,048, filed July 24, 1962, to which ⁇ reference may be had if necessary.
  • the sound absorbing spaces defined by the shells and 15 reduce the noise to an acceptable level even though the improved pulse jet burner utilizes Very small quantities of sound absorbing material.
  • the use of such material may be restricted solely to the third compartment 55 in the lowermost zone of the inner shell 15 which means that the weight of the burner is rather small.
  • the compartment 14 and the surrounding portion of the outer soundprooiing space 19 will form an effective barrier to the noise which develops in the combustion chamber 1l?, in the suction duct 11 and in the supply conduit 13.
  • the provision of the soundproong space dened by the enlarged portions 52, 53 and intermediate portion 13a of the supply conduit 13 is' an additional feature of my invention.
  • composition of sound absorbing bodies 51, 51a may be made out of slag or mineral wool or the like.
  • a shell defining a closed soundprooing space; port means in said shell forming an inlet for an oxygen-containing gaseous medium into said soundprooing space; a combustion chamber arranged entirely within said soundprooing space so that combustion gases possibly escaping from said combustion chamber through a leak therein will enter said soundproong space; a suction duct connected at one end to said combustion chamber, said suction duct passing therough said soundprooling space and through said shell so that it inlet end which is adapted to receive fuel is located outside of saidshell, said uction duct having intake opening mean located within said sound-V prooiing space in said shell to receive not only oxygencontaining gaseous medium entering said soundproong space through said port means, but also to reconvey into said combustion chamber any combustible gases which might have escaped from said combustion chamber into said soundprooing space; and a resonance duct connected to said combustion chamber and passing through said shell so ⁇ as .to convey spent gases ⁇ from said combustion chamber
  • heating pipe means having a portion located in said soundprooiing space in heat exchanging relationship with said combustion chamber and arranged to convey iiuid to be heated through said space so that the fluid may exchange heatwith vsaid combustion chamber.
  • suction duct comprises a iirst enlarged portion located externally of said outer shell, a second enlarged portion located in said soundprooiing space, and a connecting portion extending between said enlarged portions, said portions of said suction duct together defining a second soundproong space.
  • an outer shell defining an outer soundproong space; an inner shell accommodated in said outer soundproong 4space and delining a closed inner soundproofing space; port means in said inner shell forming an inlet for an oxygen-containing gaseous medium into Isaid linner soundprooing space; a combustion chamber arranged entirely within said inner soundproofing space so that combustion gases possibly escaping from said combustion chamber through a leak therein will enter said inner soundproofing space;.a suction duct connected at one end to said combustion chamber, said suction duct passing through said inner soundproofing space and through said inner shell so that its inlet end which is adapted to receive fuel is located outside of said inner shell, said suction duct having intake opening means located within said inner soundproofing space in said inner shell to receive not only oxygen-containing'gaseous medium entering said innersoundproong space through said port means, but also to reconvey into said combustion chamber any combustible gases which might have escaped from said combustion chamber into said inner soundprooiing
  • an outer shell defining a closed outer soundproong space; an inner shell accommodated in said outer soundprooiing space and defining a second closed soundproong space, said inner and said outer shells comprising walls which are spaced from each other so that said inner shell is completely surrounded by said outer soundproofing space; rst port means in said outer shell forming an inlet for an oxygen-containing gaseous medium into said outer soundproofing space; second port means'in said inner shell forming an inlet for said medium from said outer space into said inner soundproofing space; a combustion .chamber arranged entirely Within said inner soundproofing space so that combustion gases possibly escaping from said'combustion chamber through a leak therein will entersaid inner soundprooiing space; a suction duct connected at one end to said combustion chamber and passing through said inner and outer'shells so that its inlet end which is adapted to receive fuel is located outside of said outer shell, said suction duct having inlet opening means located within said inner
  • an outer shell commodated in said outer soundprooiing space and comsaid outer shell forming an inlet for anY oxygen-containing gaseous medium into said outer soundproofing space;
  • second port means in said inner shell forming an inlet for said medium from said outer space into one of said compartments;
  • a combustion chamber arranged entirely within said one compartment in said inner soundproofing space so that combustion gases possibly escaping from said combustion chamber through a leak therein will enter said one compartment;
  • a suction duct connected at one end to said combustion chamber, said suction duct passing through said one compartment and through said inner and outer shells so that its inlet end which is adapted to receive fuel is located outside of said outer shell, said suction duct having an intake opening located within said one compartment and adapted to receive not only oxygencontaining gaseous medium entering said one compartent through said second port means, but also to recon- Vey into said combustion chamber any combustible gases which might have escaped from said combustion chamber into said one compartment;
  • a shell defining a closed soundprooiing space and comprising an internal partition which divides said space into a pair of compartments, said shell further having port means communicating with one of said compartments and forming an inlet for an oxygen-containing gaseous medium into said one compartment; a combustion chamber arranged entirely within said one compartment so that combustion gases possibly escaping from said combustion chamber through a leak therein Will enter said one compartment; a suction duct connected at one end to said combustion chamber, said suction duct passing through said one compartment and through saidshell so that its inlet end which is adapted to receive fuel is located outside of said shell, said suction duct having an intake opening located Within said one compartment in such a manner ras to be adapted to receive not only oxygencontaining gaseous medium entering said one compartment through said port means, but also to reconvey into said combustion chamber any combustible gases which might have escaped from said combustion chamber into said one compartment; a resonance duct connected to saidV combustion chamber and sealingly extending through said
  • a shell defining a closed soundproofing space and comprising a first internal partition and an apertured second internal partition, said partitions dividing said soundproofing space into three. compartments including a first compartment located at one side of said first partition, a second compartment located between the other side of said first partition and one side of said second partition, and a third compartment located'at the other side of said second partition; port means in said shell forming an inlet for an oxygen-containing gaseous medium into said rst compartment; a combustion chamber arranged entirely within said first compartment so that combustion gases possibly escaping from said combustion chamber through a leak therein will enter said iirst compartment; a suction duct connected at one end to said combustion chamber, said suction duct passing through said first compartment and through said shell so that its inlet end which is adapted to receive fuel is located outside of said shell, said suction duct having an intake opening located Within said first compartment in said shell in such a manner as to be adapted to receive not only oxygen-containing gas
  • annular soundproofing space includes a first enlarged portion adjacent to said one aperture and a second enlarged portion adjacent to said take-oit pipe means.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chimneys And Flues (AREA)
  • Incineration Of Waste (AREA)
  • Details Of Fluid Heaters (AREA)
  • Housings, Intake/Discharge, And Installation Of Fluid Heaters (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
US321134A 1962-11-10 1962-11-10 Pulse jet burner Expired - Lifetime US3192986A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEJ0022632 1962-11-10

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US3192986A true US3192986A (en) 1965-07-06

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US321134A Expired - Lifetime US3192986A (en) 1962-11-10 1962-11-10 Pulse jet burner

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US (1) US3192986A (de)
AT (1) AT241071B (de)
CH (1) CH414993A (de)
DE (1) DE1454689A1 (de)
GB (1) GB1057954A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267985A (en) * 1964-03-12 1966-08-23 John A Kitchen Pulse combustion apparatus
US3361181A (en) * 1965-05-13 1968-01-02 Vaillant Joh Kg Water heater with sealed gas burner
US3395966A (en) * 1966-05-27 1968-08-06 Karl Borie Olsson Combustion apparatus
US4036324A (en) * 1974-08-16 1977-07-19 Foseco International Limited Noise reduction
US4241720A (en) * 1979-01-26 1980-12-30 Kitchen John A Pulse combustion apparatus
US4241723A (en) * 1978-11-15 1980-12-30 Kitchen John A Pulse combustion apparatus
US4259928A (en) * 1978-06-13 1981-04-07 Ludwig Huber Continuous flow water heater

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2227392C2 (de) * 1972-06-06 1983-01-13 Motan Gmbh, 7972 Isny Durchlauferhitzer
DE2744450A1 (de) * 1977-10-03 1979-04-12 Motan Gmbh Durchlauferhitzer mit resonanz-absorber

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708926A (en) * 1952-04-05 1955-05-24 Swingfire Bahamas Ltd Heating device with enclosed combustion chamber
FR1115800A (fr) * 1954-12-07 1956-04-30 Camille Dubois Paganon & Cie E Appareil générateur d'eau chaude
US2768031A (en) * 1951-04-27 1956-10-23 Tenney Aerosol generator
US2857332A (en) * 1949-08-19 1958-10-21 William L Tenney Machine for producing dispersions of liquids in air or other gases for the production of fogs
DE1057720B (de) * 1957-02-11 1959-05-21 Junkers & Co Brenneranlage mit pulsierender Verbrennung
DE1088178B (de) * 1956-10-20 1960-09-01 Erika Hingst Geb Buchholz Verfahren und Einrichtung zum stossweisen Betreiben eines Russblaesers
US3091224A (en) * 1955-12-16 1963-05-28 Gustavsbergs Fabriker Ab Device for intermittent combustion

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857332A (en) * 1949-08-19 1958-10-21 William L Tenney Machine for producing dispersions of liquids in air or other gases for the production of fogs
US2768031A (en) * 1951-04-27 1956-10-23 Tenney Aerosol generator
US2708926A (en) * 1952-04-05 1955-05-24 Swingfire Bahamas Ltd Heating device with enclosed combustion chamber
FR1115800A (fr) * 1954-12-07 1956-04-30 Camille Dubois Paganon & Cie E Appareil générateur d'eau chaude
US3091224A (en) * 1955-12-16 1963-05-28 Gustavsbergs Fabriker Ab Device for intermittent combustion
DE1088178B (de) * 1956-10-20 1960-09-01 Erika Hingst Geb Buchholz Verfahren und Einrichtung zum stossweisen Betreiben eines Russblaesers
DE1057720B (de) * 1957-02-11 1959-05-21 Junkers & Co Brenneranlage mit pulsierender Verbrennung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267985A (en) * 1964-03-12 1966-08-23 John A Kitchen Pulse combustion apparatus
US3361181A (en) * 1965-05-13 1968-01-02 Vaillant Joh Kg Water heater with sealed gas burner
US3395966A (en) * 1966-05-27 1968-08-06 Karl Borie Olsson Combustion apparatus
US4036324A (en) * 1974-08-16 1977-07-19 Foseco International Limited Noise reduction
US4259928A (en) * 1978-06-13 1981-04-07 Ludwig Huber Continuous flow water heater
US4241723A (en) * 1978-11-15 1980-12-30 Kitchen John A Pulse combustion apparatus
US4241720A (en) * 1979-01-26 1980-12-30 Kitchen John A Pulse combustion apparatus

Also Published As

Publication number Publication date
AT241071B (de) 1965-07-12
DE1454689A1 (de) 1969-02-13
GB1057954A (en) 1967-02-08
CH414993A (de) 1966-06-15

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