Патент USA US2404617код для вставки
July 23, 1946. S. J. BUDLAN E HEATING APPARATUS Filed Oct . m 25 . 1942 2,404,61 7 Patented July 23, 1946 2,404,617 UNITED STATES PATENT OFFICE 2,404,617 HEATING APPARATUS Stanley J. Budlane, Chicago, Ill., assigner to Stewart-Warner Corporation, Chicago, Ill., a corporation of Virginia Application October 23, 1942, Serial No. 463,059 7 Claims. (Cl. 126-116) 1 2 My invention relates to heating apparatus, and more particularly to heating apparatus of the in ternal combustion type. In heating apparatus of the internal combus tion type, and especially in heating apparatus one or more electrical igniters 26 for initially igniting the combustible mixture supplied to the combustion chamber l0. It will be understood that these igniters may be controlled by the usual thermostatic switch which disconnects these ig niters from their source of electrical current when designed for use in aircraft and for similar pur the heater attains normal operating temperature. poses, the muñier is located in the heat transfer Thereafter, combustion is maintained by the re means to guide the products of combustion to igniter 28 and also by the ring of burning gases this heat transfer means and to absorb sound 10 which collect in the annular corner 30 of the created in the operation of the heater. combustion chamber I0. An object of my invention is to provide heat The combustion chamber l0 is located in one ing apparatus having a new and improved muii‘ler. end of a tubular heat transfer means or heat ex Another object of my invention is to provide changer 32, which is illustrated as having hollow heating apparatus of the internal combustion type and having a new and improved muiiler 15 fins extending lengthwise thereof. A muilier 34 is located in the heat exchanger 32 and cooperates which facilitates the now of the products of com therewith to direct the hot gases, which consti bustion from the combustion chamber to the heat tute the products of combustion, into the longi transfer means. tudinal passages 36 formed in the hollow fins. Another object of my invention is to provide new and improved heating apparatus wherein 20 As these gases flow lengthwise of the hollow iins, the gases give up their heat to the heat exchanger sound absorbing material in the muñier is pro 32 and the cooled gases are discharged from the tected against melting under the temperature left-hand end of the passages 36 into an outlet produced in the combustion chamber. chamber 38 formed between the left-hand end of Another object of my invention is to provide new and improved heating apparatus having su 25 the muiiler 34 and a plate 4i), which closes the left-hand end of the tubular heat exchanger 32. perior means for directing the flow of gases there An outlet fitting 42 is mounted in the plate 4B through and for protecting the muiller against and has a passage 44 connecting the outlet cham the intense heat created in the combustion ber 38 with any suitable exhaust pipe connected chamber. Another object of my invention is to provide 30 to the threaded end 46 of the fitting 42. i The heat exchanger 32 is surrounded by a cylin a new and improved muilìer. drical casing 48 which cooperates with the heat Other objects and advantages will become ap exchanger to form longitudinal Ventilating air parent as the description proceeds. ducts between the hollow ñns. A sheet metal In the drawing: cone 50 connects the heater inlet 22 with the inlet Fig. 1 is a view showing a longitudinal section end of the casing 48, so that the Ventilating air through a heater embodying a preferred form of is supplied to this casing by the same ram or my invention; and blower which furnishes the air for the combusti Fig. 2 is a View showing a transverse section ble mixture. The left-hand or outlet end of the through the nose of the muiller, and is taken along casing 48 may open directly into the aircraft cabin the irregular line 2-2 of Fig. 1. or other space to be heated, or may be connected The heating apparatus disclosed in the drawing to ducts for directing the heated Ventilating air comprises a combustion chamber IIJ to which a combustible mixture is supplied through the ports t0 selected locations, I2 in a burner tube I4 in communication with The products of combustion flowfrom the com bustion chamber ID to the hollow fins by way of an annular tapered passage 52 formed between the tapered nose 54 of the muiiler 34 and the ad jacent portion of the tubular heat exchanger 32. one end of a Venturi tube I6. Fuel or a rich mixture of fuel and air is supplied to the throat of the Venturi tube I6 by a fuel supply pipe I8 having outlet openings 20 in the restricted throat of the Venturi tube I6. A heater inlet 22 is sup plied with air from a ram, blower or other suit able supply means, and part of this air enters the open end 24 of the Venturi tube I6 and forms a combustible mixture with the fuel supplied by the pipe I8. The combustion chamber I0 is provided With This tapered nose terminates in a cap 56 which 50 is directly exposed to the burning gases in the combustion chamber I0 and which cooperates with the rest of the tapered nose smoothly and easily to direct the hot products of combustion from the combustion chamber to the interiors of the hollow hns. ' 2,404,617 3 The muflier, in general, comprises a sheet metal shell 58 containing a quantity of sound absorbing material 66, such as glass wool or stainless steel wool. The shell 58 is provided with a plurality of small openings 62 which connect the interior of the muiller shell with the gas passages in the hollow fins and form acoustic couplings through exchanger, means for supplying a combustible mixture to said combustion chamber, a muil‘ler 10 cated in said heat exchanger and containing sound absorbing material, a sheet metal shell providing an air space interposed between said combustion chamber and said sound absorbing material and forming a heat insulating barrier which sound in the gases of combustion may ñow into the interior of the mufller and be absorbed between said combustion chamber and said mate rial, and means for directing Ventilating air over by the glass wool or stainless steel wool therein. said heat exchanger. While the glass wool or stainless steel wool is heat resistant to a considerable degree, this ma terial might melt or be softened if exposed for long periods of time to the intense heat created in the combustion chamber i Si. The muffler shell 58, therefore, terminates in an end 64, which is comprising a tubular heat exchanger, means for supplying hot products of combustion to one end of said heat exchanger, a muffler located in said heat exchanger, said muiiler having a hollow shell containing sound absorbing material, said shell separated from the cap 5% by an air or gas space 56 that serves to insulate the glass wool or stain» less steel wool from the heat in the combustion chamber Hl. This space 6B also constitutes a res onance chamber which is acoustically coupled to the interior of the shell 58 by an annular series of openings 53 located in the end lill of this shell, The mullier shell 58 and heat exchanger 32 are preferably made of thin sheets of stainless steel 2. Heating apparatus of the class described having openings providing communication be tween the interior of said shell and the interior of said heat exchanger, means providing a res-= 20 onance chamber at one end of said muiîler in posi tion to receive said hot products of combustion thereon and acoustic couplings between said res onance chamber and the interior of said muiiler shell, and means for supplying Ventilating air to the exterior of said heat exchanger. 3. Heating apparatus of the class described or other suitable material, and the cap or gas de flector plate 56 may be made of the same mate comprising means forming a combustion cham ber, heat transfer means receiving products of nichrome. rial or of more This heat cap may resistant be welded material or otherwise such combustion from said combustion chamber, a suitably secured to the tapered end of the muil‘ler 30 muiller located in said heat transfer means, said shell and constitutes a unitary part of the muiller muiller comprising a shell having a tapered end, structure. sound absorbing material in said shell, means From the foregoing description it will be ap providing communication between the interior of parent that in my new and improved heater, the said shell and the interior of said heat transfer muli‘ler is provided with a gas or air space which 85 means, and a cap attached to said shell and co insulates and protects the sound absorbing mat-e~ operating therewith to form a heat insulating and rial of the muflier from the intense heat in the sound resonance chamber interposed between combustion chamber. This heat insulating space, said combustion chamber and said sound absorb acting as a resonance chamber, cooperates with ing material. and assists the sound absorbing material in ren 40 fl. In heating apparatus of the class described, dering the operation of the heater quiet and sub the combination of a combustion chamber, means stantiallv silent. The combination insulating and for supplying means forming a combustible mix« resonance chamber is formed between a beat re~ ture thereto, heat transfer means receiving the sistant cap attached to the end of the muflier shell products of combustion from Said combustion proper, and this cap cooperates with the tapered 45 chamber, a muiiler located in said heat transfer >end of the muiiler shell to deiiect and direct the means, said muiiler including a pair of acoustical gases of combustion from the combustion cham ly coupled chambers arranged with one chamber between the other chamber and said combustion ber of the to heat the longitudinal exchanger. passages in the hollow chamber and sound absorbing material in the 50 The heating apparatus which I have illustrated other one only of said chambers, and means for and described may be made extremely compact directing Ventilating air over said heat transfer and of light weight for a given heat output, and means. is particularly adapted for use in aircraft and 5. Heating apparatus of the class described for other similar purposes. My novel heating ap comprising tubular heat transfer means, means paratus. however, is not limited to such use and 55 forming a combustion chamber for supplying is eoually well adapted for other uses wherein theproducts of combustion to one end of said heat conditions are entirely diiîerent from those en transfer means, a muiller located in said heat countered in aircraft operation. Because of the transfer means and cooperating therewith to form improved silencing effect of my invention, heating passages for the hot products of combustion, said apparatus embodying this invention is substan 60 muii‘ler having a tapered end terminating in a tially noiseless and may be utilized in _locations rounded gas deflecting cap for directing flow of where quietness of operation is of prime im hot products of combustion toward said heat portance. _ transfer means, said cap cooperating with other While I have illustrated and described only a parts of said muliler to provide a combination heat single embodiment of my invention, my invention 65 insulating and resonance chamber, said muiiler is not limited to the details shown and described. including sound absorbing material protected by but may assume numerous other forms, and my said second named chamber against extreme tem invention is to be construed as including all var peratures created in said combustion chamber, iations and modiñcations falling within the scope and means for supplying a combustible mixture of the appended claims. 70 to said combustion chamber. I claim: 6. A muiiler for a heater having a tubular heat 1. Heating apparatus comprising a tubular exchanger and means for supplying hot gases to heat exchanger having hollow fins extending one end of said heat exchanger, said muii‘ler com lengthwise thereof, means forming a combustion prising a perforated sheet metal shell containing chamber located in one end of said tubular heat 75 a quantity of sound absorbing material. and a 2,404,617 5 6 rounded cap attached to one end of said shell and containing a quantity of sound absorbing mate cooperating therewith to form an insulating chamber for protecting said sound absorbing ma terial from hot gases flowing past the cap to the rial and a cap attached to a perforated end por shell when the muñier is inserted in said tubular ' heat exchanger with said cap adjacent said means for supplying hot gases. ’7. A muiiier for a heater having a tubular heat exchanger and means for supplying hot gases to one end of said heat exchanger, a perforated shell 10 tion of said shell and cooperating therewith to form a resonance chamber adapted to protect the sound absorbing material from hot gases flowing past the cap to the shell When the muflier is in serted in said tubular heat exchanger with said cap adjacent said means for supplying hot gases. STANLEY J. BUDLANE. Certificate_ of Correction Patent No. 2,404,617. July 23, 1946. STANLEY J. BUDLANE It is hereby certified that error appears in the printed speeiiication of the above numbered patent requiring correction as follows: Column 4, line 42, claim 4, strike out the Words “means forming” and insert the same after “of” and before “a” in line 41, same claim; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. Signed and sealed this 29th day of October, A. D. 1946. [am] LESLIE FRAZER, First Assistant ó'ommz'ssz’oner of Patents.