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Nov., 12, 1946. f . y R. B. RADBILL ' MOBILE STEAM GENERATOR Filed Maron e, 194544 /8 \ “U7 2,410,900 " ‘ 5 sheets-sheet 1 v 56 - INVENTOR. HAY/volw 30ans/u Nov.`12, 1946. 2,410,900 R.~B. RADBILL mu'EaILEl STEAM GENERATOR 5 sheets-sheet é Filed March 6. -19'45 MN _ , INVENTOIE @WMM/o' ß Hnos/u, NOV. 12, 1946. RQB, RA‘D'BlLL - 2,410,900 MOBILE STEAM GENERATOR ' ` Filed March 6, 1945 @E T5 Sheets-Sheet 4 Nov. l2, 1946. _ R. B. RADBILL- - 2,410,9004 MOBILE STEAM GENERATOR Filed March 6. 1945 5 'sheets-sheet 5 Patented Nov. 12, `1946 UNITED 2,410,900 VSTATES ~ PATENT' n OFFICE f _ 2,410,900 i " MOBILE STEAM GENERATOR. Raymonde.' Radbiu, Moylan, Pa. Application March> 6, 1945, Serial No.. 581,278» 2 claims.. (C1. 122-5041) 1. 2. Thev present invention relates to steam genera tors and it' relates more» particularly to new and improved more or lessV integral units adapted for mounting on a Vehicle or the like and‘designed to generate superheated steam for delivery-f to separate heating systems orthe like. An object of the present invention is to pro videa new and improved mobile steam generator. Another object of the presentinvention isy to pro mit its being pumped' out and used directly o the road. y y ' For the `purpose of illustrating the. invention, there is showninthe accompanying drawings one form thereof` which is at. present preferred, al though it is to. be. understood that the various instrumentalities of which the invention consists can-be variously arranged and organized andthat the invention is not limited to the precise ar vide a compact more or less integral‘unitgadapted l0 rangements and. organizations of l the instrumen for mounting upon the chassis> of a truck-or other talities as herein shown and described.l vehicle and capable of quicklyv generating'super' heated steamv for' supply toY a railroad tank-car steam coil or the like. Referring to the accompanying drawings in which like reference characters.indicatelikeparts throughout: y . ’ Otherv objects and advantages' of the present 15 Figure 1 representsl a side elevationall view of invention are; apparent in the following detailed one embodiment ofthe present invention. description, appended claims and- accompanying Figure 2 represents a top-plan view ofthe steam drawings. generatingv uniti ofthe embodiment of Figure. 11 " As is well known, road tars and asphalts and Figure 3 represents4 an elevational View, on a other similar products are usually shipped in rail 20 somewhat enlarged scale, of the Vembodiment of Figure 1, but showing the other side of thev unit; road tank-cars; the tank-cars being ‘loaded while the material is relatively warm and appreciably parts being broken away better to reveal‘the con struction thereof. iluid. These materials, however, upon cooling in Figure 4 represents a rear view of the embodi the. tank-car, tend to hardenE to a point at which they are semi-solid or plastic. In this state, they 25 ment of Figures 1 to/S shown as it appears in use connected toa tank-car; parts being broken cannot be removed> from the tank-car by ordi nary pumping operations. ` away better toreveal the construction thereof. Accordingly, it is necessary to provide such Figure 5 represents a vertical cross-sectional View, on anv enlarged scale, of the novel steam tank-cars with built-in steam coils which- are adapted to be connected to a source of high 30 generating and super-heating coil forming part of the present. invention'. pressure steam to heat up the contents (after Figure 6 representsY a` vertical cross-sectional the cars have reachedv their destination) to a View generally‘along the-line 6_6- of Figure 5v. point at which they are- sumciently ñuid to. be Figure» 7 represents. a vertical: cross-sectional pumpedA out; „ In the past, it has usually been` necessaryA to 85 view generallyl alongA the line ‘I-T of Figure-‘5. In. one embodiment of the present invention unload such tank-cars at buildings having high showngenerally in Figures 1 to» ’7, I> have shown pressure steam generating systems and for- this an auto truck'indicated4 generally by thev refer reason itV has usually been impractical to direct ence characterv I0»y and' having- a standard chassis the tank-cars to a point adjacent the road', etc. being constructed or repaired, as is the most eco 40 I.I upon whichA the novelsteam generating unit to be hereinafter described is adapted to be nomical and eflicient Way to deliver such road mounted. _ tars or asphalts, etc. The steamV generating unitv includes a frame The present invention contemplates the. pro. I2 of structural.'y steel or the like upon which all vision of anew and improved- compact andA more of the parts of the unit are mounted with the 45 or less integral unit which can be» quickly in exception> of' the fuelI tank |32 which may be stalled upon the chassis of a~ standard auto truck mounted directly upon the chassis'forward'of ythe or the like. and which is’ adapted` safely;_ quickly frame Ii21 as shownA inEigures 1 and 3. ‘ and eñìciently to generate superheated" steam; Alternatively, it is possible to makei thefrarne the novel mobile unit being adapted to be driven 50 I2 somewhat larger `and to mount: the fuel‘tank up to a tank-car standing in the vicinity of'the I‘B‘upon the frame. , ' ` ` road being built or repaired and being adapted The frame I2 may be rigidly connected- to-:t'he to deliver superheated steam directly to the' heat chassis III by meansof a plurality of shackles Hi; ing coils ofthe tank-car so that the tar or asphalt it being possible t'o provide beams I5 interme can be heated to a relatively fluid state` to- per 55 diate the chassis- IIIl and the frame I2,.if" desired. 2,410,900 3 The steam generating unit includes a novel heating unit I6 to be hereinafter described in detail, an oil burner I1, a water tank I8 for sup plying water to the heating unit I6, a low pres sure air compressor or blower I9 for supplying air under pressure to the oil burner I1 and also for supplying air under pressure to the top of the fuel tank I3, a pump 20 for delivering water from the tank I8 to the heating unit I6, a power unit 4 ing tubes connected at their ends through which the steam passes back and forth to be super heated to the desired pressure of approximately 150 pounds per square inch. The outlet end of the superheating system 4I passes upward and out through the flue-opening 38; a pop-valve or |safety valve 42 being provided at the end thereof. A high pressure flexible steam delivery pipe 43 2I for `driving the blower I9 and the pump 20, 10 is detachably connected to the valve 42 and is adapted to be connected to the intake opening and means to be hereinafter described for de 44 of the steam heating coil 45 of a tank-car 46. A flexible return pipe 41 is adapted to be con heating unit I6) to the heating coils of a tank nected to the outlet opening 48 of the heating car and for condensing the used steam and re 15 coils 45; the other end of the return pipe 41 turning it to the water tank I8. being detachably connected to a return line 49 The power unit 2I may be any conventional provided with a strainer 5D and leading to a type of internal combustion engine, having a conventional steam trap 5I wherein the con 4-groove drive pulley 66. densed water is separated from the steam and The pump 2D may be any conventional type of returned to the water feed tank 18 through the 20 water pump, as for example, _a triplex water pump line 52. A bY-pass line 53 provided with a shut having a crankshaft 22, a flywheel 23 and a off valve 54 connects the lines 43 and 52 so that double-groove pulley 24. the steam trap 5I can be by~passed by closing The blower I9 is provided with a double-groove valves 55 on either side thereof and by opening pulley 61; the blower I9 and the pump 2U being the valve 54. adapted to be driven by the power unit 2I through The fuel line 2B is provided with a manual ad double V-belts 25 and 26 connecting the pulley justing and shut-off valve 56 adjacent the burner 66 to the pulleys 61 and 24 respectively. The I1. Another manual valve 6I and a strainer 62 blower I9 is adapted to deliver air under rela are provided at the other end of thefuel line 28 tively low pressure through a small line 21 to near the tank I3. the top of the fuel tank I3; the air pressure thus The fuel delivery line 28 is also provided with livering superheated steam (generated by the created at the top of the fuel tank I3 serving to drive the fuel oil through the lowermost de livery line 28 to the burner I1. Most of the compressed air from the blower I9 l passes through the relatively larger air line 29 ' to the oil burner I1. The water pump` 20 is adaptedto pump feed water from the water tank I8 through the line 36 and to deliver the water to the heating unit I6 A through the line 3 I . The water tank I6 is provided with an upper most filling pipe 32 and a level gage glass 33. The novel heating unit I6 forming part of the present invention includes a head 34 of ceramic heat-resistant material having an open-ended ‘ an automatic safety shut-off valve 51 which is ‘spring-tensioned to closed position and which is provided with an outer arm or lever 58 to which one end of a wire or cable 59 extends; the other end of the wire or cable 59 being secured- to the pop-valve 42 through a fusible metal link 6D. The lever 58 cf the automatic valve 51 is nor mally held by the wire or cable 59r so that it maintains the valve 51 in open position (against the spring pressure thereof) to‘permit flow of fuel oil therethrough to the burner I1. Should the temperature in the heating unit I6 rise too high (duc to failure of the water supply system or to any other cause), the link 6U will melt and -will release the wire or cable 59 which in turn will permit the automatic valve 51 to move combustion chamber 35 therein; the nozzle 36 of the oil burner I1 being in line with the opening to closed position thereby to shut off the flow of of the combustion chamber 35 and being adapt ed to blow the combustion gases thereinto. ` The head 34 is connected to the rear end of an ‘ fuel to the burner I1. , '- ‘ Instead of being directly connected to the pop valve 42, the fusible link 60 may be connected to elongated generally cylindrical horizontally-dis~ the pipe intermediate the valve 42 and the inner posed heat-transfer chamber 31 of metal or the most superheating tubes 4 I. like through which the combustion gases pass, Shut-off valves 63 and 64 may be provided in eventially to escape through a flue-opening 38 the water lines 3D and 3I respectively, adjacent provided at the front end of the chamber 31. the pump 2U. . Within the heat-transfer chamber 31 is dis The power unit 2 l, the blower I9 'and the pump posed a continuous water-tube steam generating 20 may be installed within a weather-proof com coil system which includes an outermost helical partment 65 to protect them from the elements. coil 39 fitting snugly within the chamber 31 and In operation, the novel mobile steam generating extending generally the entire axial dimension 60 unit of the preesnt invention will quickly supply thereof. superheated steam under appropriate pressure to As shown particularly in Figure 5, the rear end the heating coils 45 of the tank-car 46 until the of the coil 36 extends downwardly and through tar or asphalt has been heated sufficiently .to the wall of the chamber 31 and is connected with render it relatively fluid whereupon it 'can be the water delivery line 3|. pumped out of the tank-car by any appropriate The front end of the coil 39 is connected with pump in conventional manner. the corresponding end of an inner superheating ` The return pipe 41, the return line 49 and the coil 40 disposed co-axially with the outer coil 38 steam-trap 5I permit continuous return of the but radially spaced appreciably therefrom. The inner coil 40 extends rearwardly from its 70 used steam to the water tank I8 so that it is not necessary to add water to the tank except at rare intake end and terminates substantially short of the rear end of the outer coil 39. The rear end of the coil 48'connects with one end of an in intervals. Thus, the novel mobile steam generating unit of the present invention can be used at' places nermost superheating tube system 4l which is. made up of a plurality ofspaced axially-extend 75 .where there is no city or other water supply, 2,410,900 s 6 . The pop valve 42, the fusible link `lill, the cable 59 andthe automatic valve 51 provide a foolproof unit which cannot explode, since, when the tem perature and pressure within the heating unit I6 become excessive, not only is the pop valve opened to release the steam, but also the auto matic valve 51 is closed to shut off the oil burner I1. Where two or more cars are provided with in~ ter-connected steam heating systems, they can , all be heated simultaneously; the delivery pipe 43 being connected to the first car and the return pipe 41 being connected to the last car. While the novel mobile steam generating unit of the present invention is intended primarily for use in heating road tar, asphalt and other bi to said oil burner andv including-a combustion chamber and an elongated heat-transfer cham ber communicating with said combustion cham ber, a closed coil system disposed within said heat-transfer chamber, said coil system including a relatively long outer coil, a shorter coil disposed generally coaxially within said outer coil and spaced substantially radially therefrom and a se ries of innermost generally axially-extending superheating tubes, means vfor forcing water through said outer coil, said inner coil and said innermost tubes successively, said water being converted to superheated steam therewithin, a steam delivery line leading from said coil system and having a safety valve adapted to relieve ex cessive `steam pressure, an automatic shut-olf tuminous products, it can be used equally well with other petroleum derivatives such as Amiesite, valve operatively connected within said fuel line, displacement (preliminary to welding, for exam heating unit disposed in operative juxtaposition and means including a fusible metal link posi tioned adjacent said steam delivery line for clos or with molasses or other products requiring heat~ The novel mobile steam generator of the pres 20 ing said automatic shut-off valve when the tem perature of said steam delivery line exceeds a ent 'invention can also be used wherever high predetermined value. pressure steam is required remote from fixed _2. In a mobile steam generator adapted for steam and/or water supply; as for example, in mounting on an auto truck or the like, an oil thawing manholes or culverts, cleaning drums, tanks or other equipment, soil sterilization, gas 25 burner, a fuel line leading to said oil burner, a to said oil burner and including a combustion chamber and an elongated heat-transfer chamber The novel unit of the present invention gen communicating with said combustion chamber, a erates steam almost immediately upon lighting of the oil burner and the ratio of weight to steam 30 closed coil system disposed within said heat ple),etc. , generating capacity is extremely low. transfer chamber, said coil system including a relatively long outer coil, a shorter coil disposed The present invention may be embodied in generally coaXially within said outer coil and other speciñc forms without departing from the spaced substantially radiallytherefrom and a se- _ spirit or essential attributes thereof, and it is ries of innermost generally axially-extending su therefore desired that the present embodiment perheating tubes, means for forcing water be considered in all respects as illustrative and through said outer coil, said inner coil and said not restrictive, reference being had to the ap innermost tubes successively, said water being pended claims rather than to the foregoing de converted to superheated steam therewithin, a scription to indicate the scope of the invention. Having thus described the invention, what I 40 steam delivery line leading from said coil system and having a safety valve adapted to relieve ex claim as new and desire to protect by Letters Pat cessive steam pressure, an automatic shut-off ent, is: valve operatively connected with> said fuel line, l. In a mobile steam generator adapted for and means for closing said shut-off valve upon mounting on an auto truck or the like, an oil ' burner, a fuel line leading to said oil burner, a 45 overheating 0f said coil system. heating unit disposed in operative juxtapositionv RAYMOND B. RADBILL.