Патент USA US2122930код для вставки
July 5, 1938. - 2,122,930 A. CURIONI MECHANICAL CONTROL MEANS FOR LIQUID FUELIBURNERS Filed June 29,, 1935 2 Sheets-Sheet 1 Fig.1 72 71 77 76' 76 75 ‘ 6665 I a1 I’ 2:) 2 INVENTOR 141.00 CUE/ON! BY M ATTORNEY July 5, 1938. A. CURIONI ‘ 2,122,930 MECHANICAL CONTROL MEANS FOR LIQUID FUEL BURNERS Filed June 29, 1955 24 2 sheets-sheet 2 25 INVENTOR A1. 00 Cue/0N1 BY ‘ M ATTORNEY Patented July 5, 1938 2,122,930 UNITED STATES PATENT OFFICE 2,122,930 vMECHANICAL CONTROL MEANS FOR LIQ » UID' FUEL BURNERS Aldo Curioni, Katonah, N. Y., assignor to The Gasolaire Corporation, poration of New York New York, N. Y., a cor Application June 29, 1935, Serial No. 29,126 1 Claim. This invention relates to devices for controlling electric circuits and more particularly refers to improvements in control devices for liquid fuel burners of the type in which electric means are 5 used for igniting the fuel when the operation of the burner is started. As an example of one type of burner in con _nection with which the improvements forming the subject of the present invention may be used, reference may be had to an oil burner, such as described and claimed in my copending applica tion, entitled “Oil gasi?er and burner”, Serial No. 715,335, in which a mixture of air and atom ized fuel is directed under pressure against a hot 15 impact plate in a vaporizing chamber so as to issue therefrom in the form of a combustible gas. In said burner the impact plate is initially heated by means of an electric resistance ele ment, which is rendered incandescent by the pas sage of an electric current and which is arranged so as to function both as a preheater of the im pact plate and as an igniter of the air-fuel mix ture. An electric motor is used for driving a splash wheel, which directs a spray of atomized 25 fuel against the impact plate, and an air pump, which supplies air under pressure to the vapor izing chamber. In the operation of a burner of the type speci ?ed, or in fact of a burner of the general type 30 used for house heating purposes, it is desirable to delay the admission of fuel to the vaporizing chamber until the igniting element is ready to function, and if used also as a preheating ele ment for the impact member, until the impact “ member has been heated to a temperature suffi lo been produced by the gradual operation of a tilt able mercury switch. All of these controlling devices more or less entail complications in the control circuit and generally result in rather expensive installations, comprising a number of different elements, fre quently apt to get out of order or to require con stant attention. The primary object of the present invention is to provide a novel and improved arrangement 10 for controlling the operation of the electric ele ments of a liquid fuel burner, whereby the various circuits are controlled in the proper sequence by means of an entirely mechanical character. Another object of the invention is to provide a 15 novel and. improved type of multiple circuit con trolling switch whereby a plurality of circuits can be controlled in a predetermined ation of the various circuits in a predetermined 25 sequence. Other objects and advantages of the present invention will more fully appear as the descrip tion proceeds and will be set forth and. claimed in the appended claim. 30 My invention is illustrated by way of example in the accompanying drawings, in which: Fig. l is a vertical section of a multiple circuit controlling switch, adapted for use in connection with a liquid fuel burner of the character above 35 cient to vaporize the fuel. It is also desirable to speci?ed; through line 2-2 of Fig. 1; ments mentioned has usually been obtained through the utilization of the thermic or magnetic eifects of an electric current. Thus, switches controlling the various circuits have been caused to operate by the energization or deenergization of solenoids, by relays controlled by thermostatic 50- devices, or by some mechanical action due to the expansion of a metallic member or coil under the in?uence of heat. In some cases, delay pro ducing devices, such as a dashpot, for instance, have been used in order to delay the closing or opening of a circuit; in other cases a delay has sequence through the operation of a single actuating member. 20 A further object is to provide a multiple circuit time delay switch of a simple and sturdy con struction, comprising a minimum number of parts and adapted for positive and reliable oper deenergize the igniting element after the ignition of the fuel has taken place, without, however, discontinuing the operation of the motor actuat ing the fuel and air supplying means. In control systems heretofore known the re quired sequence of operation of the various ele 4 (Cl. 200-35) Fig. 2 is a plan sectional view of the same Fig. 3 is a detail plan sectional View through line 3-—3 of Fig. l; and 0 Fig. 4 is a diagrammatic representation of an oil burner and an electric circuit, comprising the electrically operated elements of said burner and the multiple control switch shown in Figs. 1 to 3. Referring to the diagram of Fig. 4, l0 desig- 45 nates the body of a burner of the type described and claimed in my copending application above referred to, said body forming a quasi circular chamber H at the bottom of which a supply of liquid fuel, I2, is maintained at a constant pre- 50 determined level, and an extension from said chamber in the form of a tubular arm l3, termi nating in a vaporizing chamber (not shown) within which is located a tubular impact mem ber I4. 55 2,122,930 2 Said impact member is initially brought to a high temperature, sufficient for vaporizing the fuel, by an electric resistance element l5, housed therein. An electric motor |6 actuates a splash wheel l1, housed within chamber H and having its lower edge portion immersed within the liquid fuel |2. By virtue of this arrangement, the splash wheel during its rotation picks up fuel from the bottom of chamber | | and projects it in .10 atomized form within tubular extension |3 against the impact member 14. 35, switch 3|, wire 29, resistance element l5 and back through wire 24 to main wire 2|. This will cause the energization of resistance element |5 which will become incandescent and will raise the temperature of impact member M to the fuel vaporizationpoint. Thislasthavingbeenreached, switch 28 should now be closed by insertion of knife blade 38 between contact members 21, 32. This will complete the circuit of the motor through wires 22, 26, so that liquid fuel will now be projected against the hot impact member l4. By means of a special arrangement (not shown) when the atomized fuel, mixed with air, strikes the hot surface of impact member M and becomes vaporized, part of the resulting gaseous fuel is caused to come in contact with the surface of the incandescent electric element l5, which after having functioned as a preheater for the impact member, will now act as an igniter for the fuel. As stated before, in the operation of this type of burner it is desirable ?rst to energize the resistance element l5 so as to bring the impact member M to a fuel vaporizing temperature and then to start the motor, in order to supply fuel and air to the vaporizing chamber. The air After a short period ignition of the fuel will have occurred and resistance element l5 should be deenergized by withdrawal of knife blade 39 from its closed position shown. This will inter 15 rupt the circuit of the resistance element but will not affect the circuit of the motor, which will remain closed through switches 20, 28. fuel mixture having become ignited by contact with the electric resistance element, the latter being no longer needed, should then be deener gized while the electric motor continues to op erate. In order to automatically control the energiza tion and deenergization of the various circuits involved in the proper sequence, without re sorting to the use of devices depending for their operation upon magnetic or thermic effects of the electric current employed, I have devised an entirely new type of switch whereby all the cir~ ouit connections are controlled by purely me chanical action, the various switches being op erated by a single control mechanism. In the diagram of Fig. 4, H3 designates one of the main wires from an electric source of supply, leading to one of the contact members I9 of a knife switch 20, 2| designates the other main wire, a branch of which, 22, leads to one of the poles 23 of the electric motor l6 and another branch 24 leads to resistance element l5. The other pole 25 of the electric motor is connected by a wire 26 to a contact member 21 of a knife switch 28, and the return wire 29 from the re sistance element I5 is connected to a contact member 30 of a knife switch 3|. The other con tact member 32 of switch 28 is connected to the other contact member 33 of switch 20 by a bar 34 and a wire 35 connects said bar 34 to the other contact member 36 of switch 3|. Connec tion between the contact members of switch 20 can be established by insertion therebetween of knife blade 31 and in a similar manner con— nection between the contact members of switch 28 can be established by insertion therebetween of‘ knife blade 38 and connection between the contact members of switch 3| can be effected by insertion therebetween of knife blade 39. When the burner is inoperative the various switch elements are in the position shown, in which knife blade 39 closes the circuit of switch 3| while switches 20, 28, are open. No current 70 can ?ow through the circuit because the main circuit is interrupted at the switch 20. In order to start the burner the circuit should ?rst be closed at 20 by inserting knife blade 31 be tween contact members IS, 33; the current will then ?ow through wire l8, switch 20, bar 34, wire In Figs. 1 to 3 I illustrate a switch mechanism adapted to control the circuits just described by 20 entirely mechanical means. The switch assembly, which is enclosed in a casing 40, includes the switch elements shown in Fig. 4, which are also shown in a larger scale in Fig. 3, and means for actuating the same in 25 the proper sequence. The switch contact members are carried by an insulating block 4| and the switch blades are preferably mounted so as to operate with a quick make and break action. For instance, knife blade 31 is pivotally mounted at 42 on a bracket 43 inwardly extending from end wall 44 of the casing. On the same pivot is mounted a dog 45, having two angularly spaced finger extensions 45, 41, and a downwardly inclined extension 48, connected by a snap-over spring 49 to the switch blade 31. In the position shown, ?nger extension 46 is directly in the path of a pin 59, carried by an arm 5|, mounted on a shaft 52. If said shaft is caused to rotate in a counterclockwise direction, as indicated by the arrow in Fig. 1, pin 50 will after a while press against ?nger extension 46, swinging dog 45 in a clockwise direction about its pivotal support. This will eventually cause 45 the point of attachment 53 of the snap-over spring 49 to reach and pass beyond the dead point, when said snap-over spring, the tension of which has been in the meantime increased, will be able to suddenly contract, acquiring the posi tion shown in dot and dash lines at 49’, and forcing the switch blade to the position shown in dot and dash lines at 31’. This will also cause the dog 45 to acquire the position shown in dot and dash lines at 45', in which its finger extension 41 will have come to occupy the position shown at 41’, which is di rectly in the path of the return movement of arm 5|, which will ultimately have acquired the po sition shown in dot and dash lines at 5|’. 60 Switch blades 33, 39, are pivotally mounted to operate in substantially the same manner on brackets 54, 55, respectively, which are horizon tally spaced a certain distance from bracket 43. Pivots 56, 51, of switch blades 38, 39, are prefer 65 ably coaxial with pivot 42 of switch blade 31, as shown, although the three switch blade struc tures are entirely independent of one another. In order to operate the three switches in the proper sequence, it is, therefore, sufficient to pro vide shaft 52 with two additional switch actuat ing arms, 58, 59, extending therefrom, said arms being provided with actuating pins 60, 6|, re spectively, and being angularly spaced with re spect to each other and arm 5|, so as to deter 2,122,930 mine the proper time delay between the opera tion of the three switches. It is to be understood that the movement of rotation of shaft 52 should be relatively slow switch controlling the igniter normally closed, it is, of cour scope of my invention to use two in order to allow a su?icient time to elapse be tween the operation of the ?rst switch, causing the energization of the electric resistance ele ment, and that of the second switch controlling the motor circuit; the movement of rotation of 10 said shaft should, therefore, be controlled by a suitable time delay mechanism, for instance, an escapement mechanism of the conventional type shown. ' In the same shaft 52 is urged to rotate in a 15 counterclockwise direction by a tension spring 62, attached to a band 63 wound upon a drum S4, ?xed on said shaft. Said shaft also carries an actuating arm 65, which projects frontwardly of the casing through a segmental slot 66. Said 20 arm 65 is equipped with a pawl 61, engaging a ratchet wheel 68, formed integral with or at tached to a gear wheel 69, forming part of the escapement mechanism. Said gear Wheel is in its turn in mesh with a pinion ‘in, integral with gear 25 wheel 1|, meshing with a pinion ‘l2, integral with a sprocket wheel 13. The rotation of the sprock et wheel 13 is controlled by the escapement mechanism proper, said escapement mechanism comprising a balance wheel 14, mounted on a 30 shaft 15, to which is secured one end of a hair spring ‘it, the other end of which is secured to some stationary point, as at 11. A pin 18 ex tends from the balance wheel 14 to engage the teeth of the sprocket wheel 13, completing the escapement mechanism which functions in a well known manner. It is to be understood that the particular type of time delay device used, in order to slow up the rotation of shaft 52, has no bearing on the present invention since it is obvious that a num ber of different arrangements may be used for the same purpose. The switch mechanism is normally set in its inoperative position by look ing its actuating arm 65 against rotation. For 45 instance, said arm may be provided with a pin ‘59 adapted to be engaged by a latch 80, urged into its engaging position by a spring BI, and adapted to be released by pressing against a ?nger 82. 50 It is obvious that, the switch mechanism be ing in its inoperative position shown in the drawings, by forcing ?nger 82 upwardly latch 80 will release arm 65 and shaft 52 will begin to rotate, due to the pull exerted by spring 62. 55 Its movement of rotation will take place slowly, due to the delaying action of the clock mecha nism, and the three switches controlling the op eration of the burner in the manner described will be operated in the proper sequence. On the other hand, due to the unidirectional character of the connection between arm 65 and ratchet wheel 68, shaft 52, together with arms 5|, 58, 59, carried thereby, can be quickly‘re stored to its normal position, shown in the draw ings, by means of its actuating arm 65; latch 68 automatically reengaging pin 19 as soon as the return movement of said shaft and arms has been completed. _, It will also be observed that during their return j movement arms 59, 58, 5| will restore the switches to their original status, pins 6|, 60, 50, striking ?ngers 41 of the dogs 45 forming part of the switches, in the order named. Although I have shown and described the of the movement of the actuating means. other words, the switch arrangement should be such that the operation of the actuating member will ?rst cause the energization of the igniter circuit, then the energization of the mo tor circuit, and then the deenergization of the igniter circuit. Although I prefer to use individual actuating arms for the various switches because of the possibility of setting said arms at different angu~ lar positions, it is within the scope of my inven tion to use a single actuating member mounted on shaft 52; said actuating member having suit 20 ably spaced means for actuating the various switches in the proper sequence after the re quired time intervals. It is also within the scope of the invention to reverse the relative positions of the switches and actuating means by placing 25 the switch operating members at different points along the path of travel of a single actuating member. From the foregoing it will be seen that I pro vide a thoroughly reliable system of control of a 30 plurality of circuits such as are employed, for instance, in connection with an oil burner; my invention also including a new type of multiple switch control mechanism whereby a single op— erating member is caused to control a plurality 35 of circuits in a predetermined manner by purely mechanical means. It is obvious that the constructional details of my invention-may vary from those shown with out departing from the inventive idea. The drawings will, therefore, be understood as being intended for illustrative purposes only and not 40 in a limiting sense. I accordingly reserve the right to carry my in vention into practice in all those ways and man ners which may enter, fairly, into- the scope of the appended claim. I claim: A device of the class described comprising a normally open two pole main switch, a normally open two pole secondary switch having one of its 50 terminals electrically connected to one of the terminals of said main switch, a normally closed auxiliary switch having one of its terminals also connected to said two connected terminals, said 55 switches being arranged in spaced planes, a shaft disposed transversely of said planes, a spring urging said shaft to rotate in a given di rection, releasable means restraining said shaft against rotation, time delay means regulating 60 the speed of rotation of said shaft when released, a plurality of switch actuating arms carried by and spaced along said shaft, said arms being an gularly disposed with respect to one another and to said switches, so as to ?rst close said main switch, then close said secondary switch, and 65 then open said auxiliary switch after a prede termined time interval said arms restoring said switches to their original status when said shaft is returned to its original position, and a man ually operable arm mounted directly on said 70 shaft, for restoring said shaft to its original po sition, independently of said time delay means. ALDO CURIONI.