Патент USA US2128264код для вставки
Aug. 30, 1938. F, w, OFELDT 2,128,264 BURNER Filed July 18, 1936. y M 'NTOR. WW“, ' ATTORNEY. Patented Aug. 30, 1938 2,128,264 UNlTED STATES PATENT OFFlCE 2,128,264 BURNER 7 Frank W. Ofeldt, McKeesport, Pa, assignor to Homestead Valve Manufacturing Company, Coraopolis, Pa., a corporation of Pennsylvania Application July 18, 1936, Serial No. 91,405 10 Claims. This invention relates to burners generally and more particularly to burners which are provided with means for preheating or volatilizing ?uid fuel and the method of operating the same. This invention may be conveniently applied to heaters that require uniform distribution of the burning gases and accurate timing of com bustion within the combustion chamber. Heaters that may advantageously employ these features 10 are found in the coil heater art for Water heaters, spray or atomized heaters and the like, some of which are disclosed in my Letters Patent No. 1,925,643, No. 1,970,971, and applications for Let ters Patent Serial No. 36,290, ?led August 15, 1935 15 and Serial No. 88,106, ?led June 30, 1936, and others referred to therein. In coil heaters the form of the coils and the manner in which they are placed within the com bustion chamber determine the ba?iing charac 20 teristics for distributing and guiding the ?ame. To vary the control of the ?ame hitherto it has been necessary to reform or rearrange the coils or parts which are being heated. As a practical consideration it is usually necessary to construct 25 a new heater for this purpose, which adds ex pense. The principal object of this invention is the provision of a new and improved de?ector for controlling the distribution and timing the com 30 bustion of the ?ame. Another object is the provision of improved means for preheating or vaporizing a ?uid fuel prior to discharging it‘ against the de?ector, thereby permitting accurate control thereof. 35 This invention also contemplates a novel jet (Cl. 158-—53) nuts 8. 9 represents spacer members around the bolts 'l‘between the base‘! and the arms 5 for maintaining spaced relation between these parts to reduce heat conductivity therebetween. The ring casting is provided with aligned slots‘ 5 ll! in the same plane as the outwardly extending arms 5. These slots are arranged to receive the outer ends of the de?ector member supporting arms H. Where the arms 5 are joined to the ring I5 I provide the bosses 12. These bosses are‘ 10 drilled to receive the bolts l3 which pass through the outer ends of the de?ector supporting arms I l for securing the same to the ring casting 4 as by the nuts IA. The arms 5 may be strengthened by means of 515 the webs l5 which extend between the bosses l2 and the arms 5. These strengthening webs also aid in providing radiating surfaces for cooling the ring casting. To this end the ring casting 4 may be provided with the radially disposed radiatingl 20 ?ns, as indicated in dotted lines in Fig. 1 at IS. The de?ector supporting arms ll extend ra dially from the ?ame de?ecting member I‘! and are provided with the V-shaped depending ?anges i8 which strengthen said arms and prevent tur-‘ 25 bulence of the ?ame as it passes therearound. The de?ecting member I‘! is preferably hollow. The lower portion IQ of the de?ector is preferably spherical and the upper portion 20 cylindrical. Thus combustible gases impinged on the under’ 30. surface thereof will be spread uniformly there around. The spherical surface also dispenses with the necessity of accurately adjusting the center of the impinging gases to strike the center of the de?ector. Thus slight misalignment of the 35 burner nozzle caused by assembly or by relative expansion of the parts due to different materials and priming device for initially starting combus tion. Other objects appear hereafter. In the accompanying drawing wherein I have . or due to different temperatures will not impair the proper function of the de?ector. I am thus 40 illustrated a practical embodiment of the prin enabled to avoid the dif?culties arising from the 40 ciples of my invention: I Fig. l is a plan view of the burner assembly use of conical or pointed de?ectors. One arm l l is provided with a boss 2! which is comprising my invention. Fig. 2 is a side elevation of the burner shown 45 in Fig, 1. Referring to the drawing, l represents the base of a combustion chamber or outer casing having an aperture 2 through which the burner assembly 3 is arranged to extend into the combustion chamber. The burner assembly comprises the ?ame guiding ring casting 4 having oppositely disposed outwardly extending arms 5. Adjacent their outer ends the arms 5 are provided with the holes 6 for receiving the bolts 1, arranged to 55 secure the burner assembly to the base I by the drilled to receive and hold one end of the tube forming the fuel preheating coil 22. The fuel 45 being fed to the heating coil is arranged to pass from the fuel supply up through the vertical por tion 23 of the coil. Near to the top of the vertical portion 23 the ?rst coil turn 24 is formed. The uppermost position of the coil 22 occurs at sub~v stantially the ?rst half of the coil turn 24 as in dicated at 25. The coil then descends and is wound around the cylindrical portion 20 of the de?ector ll. The last turn 26 of the coil is di rected toward the boss 2!. The tube is then, 55 "2'v ' ‘ ' 2,128,264. ' formed to pass down through the boss as shown at 21. The tubing extends below the ring casting 4 as shown at 28 and is arranged to extend radially inwardly toward the center of the de?ector I1. 29 represents a nozzle secured to the end of the tube and provided with the port 30 arranged to direct the fuel against the center of the spherical surface [9 of the de?ector [1. The de?ector I‘! is provided with the radially 10 projecting lugs 31 , 32 and 33 arranged to support the lower side of the coil 22 as it winds down around the de?ector. ' It will be noted from Fig. 1 that the coil turn 15 24 extends out in the direct path of the burning gases and is subjected to considerable heat. As, suming that oil under pressure is used for fuel, it will ?ow from the source of supply up through the tube 23 through the ?ame guiding ring 4 to 20 the coil turn 24 and therearound to the highest point 25. During this time it will have been heat ed sufficiently to volatilize. The volatilized fuel then passes around the balance of the turn 24 and through the coil, the tube 28 to the nozzle 29, from whence it is expelled out the opening 39 of the jet. The volatilized fuel becomes superheated as it passes through the coil 22. This promotes quick and efficient combustion. ‘ The highly heated fuel impinging against the 1.130 spherical surface and being de?ected therearound has been found not to support combustion until it reaches the de?ector arms I! and the lugs 3i and 33, as the ?ame propagation is not as fast as the velocity of the gas over the spherical surface. i235 By placing the lugs or ears 34 on the spherical surface of the de?ector I am enabled to control the timing of the initial ?ame combustion. These small lugs on the spherical surface create a vor tex in the ?ow of the fuel forming a turbulent 1540 action therein which causes ignition of the fuel at the tips of the lugs. Thus the position of the i 50 lugs on-the spherical surface I9 determines the time at which combustion of the fuel is started. As the fuel strikes the spherical surface it is distributed uniformly therearound and is guided up through the ring 4 past the fuel heating coil 22. As the fuel supply continues to ?ow through the coil 22 it becomes heated, vaporizes and is discharged from the nozzle. The de?ector I‘! and the coil 22 become quite hot, which aid in main taining the heating cycle. 35 represents a priming pan which may be con veniently supported from the burner structure by means of the arm 3'6 secured at its free end un L55 der- the nut M on the bolt l3 which holds the de ?ector to the ring casting 4. The priming pan may be provided with fuel and a wicking, such as waste, which when ignited heats the nozzle and the lower portion of the fuel pipe and the fuel therein. This 160 continues until the burner ?ame heats the fuel in the coil 22 sufficiently to permit continuous op eration thereof. A notch 3'!‘ is formed in the bottom edge of the depending ?ange [8 adjacent the de?ector l1. 165 This notch provides a break in the lower edge of each ?ange and permits ‘that portion of the com bustible gases and the ?ame that is adjacent the de?ector IT to pass up along both sides of the depending ?anges i8 and the arms II. If the lower edges of these ?anges were permitted to ex tend horizontally to the de?ector a portion of the gases and the ?ame would roll therealong toward the ?ame guiding ring 4 and be de?ected down wardly, creating a rotary turbulence that would have a detrimental effect on the burning fuel. Thus by abruptly changing the contour of the ?anges l8 adjacent the de?ector I‘! so that it extends upwardly toward the de?ector, that por tion of the fuel and ?ame passing therearound is carried by its own velocity to a point above the lower edge of the ?ange and therefore travels undisturbed to the combustion zone. 1. In an oil burner, the combination of a ?ame guiding ring, a de?ector positioned concentrically 10 within said ring and having an under arcuate surface, means for supporting said de?ector from said ring and for positioning the lowermost por tion of the arcuate surface of the de?ector slight ly below the lower perimetral edge of said ring, a 15 preheating fuel coil mounted on said de?ector in spaced relation with the inner wall of said ring, a burner positioned in spaced relation beneath said de?ector and connected to said coil, and means on the under arcuate surface of the de?ec 20 tor disposed above the lower perimetral edge of said ring for timing the initial ?ame combustion of the fuel issuing from the burner. 2. In an oil burner assembly, the combination of a burner, a baf?e having a convex under sur 52 5 face disposed above the burner for distributing the ' combustible gases issuing therefrom, a fuel sup ply coil wound in a helix about the baffle and hav ing its lower end connected to the burner, lugs on the perimetral surface of the baffle under support- 7‘. ing the coil, and means below said lugs for reduc ing the velocity of a portion of the combustible gases to maintain initial ?ame combustion thereof “between said lugs and said means. 3. In an oil burner assembly, the combination of a ?ame guiding ring, a de?ector positioned ax ially of the ring and supported therefrom for dis tributing the combustible gases within said ring, a burner disposed beneath the de?ector, a fuel supply coil disposed about and supported by the de?ector and having its lower end connected to the burner, and means on said de?ector below said coil for reducing the velocity of a portion of the combustible fuel to maintain initial ?ame com bustion thereof between said coil and said means.;;45 4. In an oil burner assembly, a unitary struc ture comprising a de?ector arranged to distribute combustible gases, a preheating fuel coil sur rounding the de?ector and supported thereby, a burner positioned beneath the de?ector and; supported by the lower end of the coil, and means on said de?ector below said coil for reducing the velocity of a portion of ‘the combustible fuel to maintain initial ?ame combustion thereof be tween said coil and said means. 5. A de?ector for use with a burner which com- a prises a body portion having an under arcuate portion arranged to be positioned in the path of the'combustible gases issuing from the burner to distribute the same, an arm‘ for supporting said body portion, the under side of said arm extend ing upwardly adjacent the said body portion to prevent the ?ame from extending along said arm. 6. A de?ector arranged to be positioned over a burner which comprises a cylindrical body por-» 65 tion having an under arcuate surface for distribu ting the combustible gases issuing from the bur ner, an arm having a depending ?ange of down wardly converging cross section for supporting the de?ector, the lower edge of said ?ange ex tending upwardly to said body portion to prevent the ?ame from extending along the bottom of said ?ange. ‘ 7. In an oil burner, the combination of a fuel jet, a de?ector against the surface of which the~.' 70 2,128,264 combustible gases of the fuel impinge, the said 3 surface being substantially semispherical, and impinge, and a plurality of spaced projections ar ranged about the perimetral surface of the de means disposed on said surface to control the ?ector member above the apex thereof for re combustion timing of a portion of the ?ame of burning fuel by reducing the velocity of a part of the combustible gases to a point wheretheprop agation is maintained immediately above said ducing the velocity of a portion of the combustible gases to maintain initial ?ame combustion of the fuel at a point in the immediate region above said means. 8. A de?ector member to be disposed above an 10 oil burner and having a convex lower surface against which the combustible gases of the fuel impinge, and means on said de?ector disposed above the apex thereof for reducing the velocity projections. 10. A de?ector member to be disposed above an oil burner and having a convex lower surface against which the combustible gases of the fuel impinge, and a plurality of spaced projections on 10 the convex surface of the de?ector member above the apex thereof for reducing the velocity of a part of the combustible gases to maintain initial flame combustion of the fuel at a point in the of a part of the combustible gases to maintain 15 initial ?ame combustion of the fuel at a point in the immediate region above said means. immediate region above said projections, said 15 9. A de?ector member to be disposed above an projections being at all times below the zone ‘of oil burner and having a convex lower surface combustion. ‘ against which the combustible gases of the fuel . FRANK W. OFELDT.