US2117190A - Domestic heavy oil burner - Google Patents

Domestic heavy oil burner Download PDF

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US2117190A
US2117190A US100759A US10075936A US2117190A US 2117190 A US2117190 A US 2117190A US 100759 A US100759 A US 100759A US 10075936 A US10075936 A US 10075936A US 2117190 A US2117190 A US 2117190A
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steam
oil
generator
nozzle
conduit
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May Thomas Leslie
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May Thomas Leslie
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D11/00Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/10Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
    • F23D11/18Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour the gaseous medium being water vapour generated at the nozzle

Description

May 10, 1938.
LINE
T. L. MAY 2,117,190
DOMESTIC HEAVY OIL BURNER Filed Sept. 14, 1936 3 Sheets-Sheet 1 Tia/77d; 1.4/0;
,4ffornez May 10, 1938. T. L. MAY 2,117,190
DOMESTIC HEAVY OIL BURNER Filed Sept. 14, 1936 3 Sheets-Sheet 2 "STEANY May 10, 1938. T. L. MAY 2,117,190
DOMESTIC HEAVY OIL BURNER Filed Sept. 14, 1936 3 Sheets-Sheet 3 //7 van/0r Patented May 10, 1938 UNITED STATE PATENT- 0 FFICE 18 Claims.
My invention relates to fuel oil burning devices adapted for use in domestic service and more particularly to domestic fuel oil burning devices especially designed to atomize and burn s residual oils commonly known as "heavy" fuel oils. Most oil burning devices, particularly those developed for domestic service, have heretofore been confined to the use of the distillate oils or "light" fuel oils, identified by the grade numbers 1, 2 and 3 by the American Society for Testing Materials. The distillate oils are those oils which are distilled from crude petroleum at certain stages of the distillation proees, and each possesses'to a greater or less degree the common it of comparatively ready volatility assists in the attainment of complete combustion and in producinga steady flame.
'lhere'sidualoilsontheotherhand,suchforexampleasthoseknownbygradenumbersijandd of the aforementioned American Society for Testing Materials have a relatively high viscosity at ordinary temperature and are substantially nonvolatile. Owing to their thick, gummy nature at. ordinary temperatures, flow of these oils through the conduits no ma y employed in fuel burning devices of the nature described is not readily attained and satisfactory atomization of these oils employing the mechanical compressors and atomizing nozzles now in widespread use in domestic fuel oil burning devices is almost impossible of attainment. However, it is known that these residual oils possess highly combustible qualities and moreover the cost thereof on the open market is substantially lower than that of the distillate oils. It is therefore an object of my invention to provide a readily manufactured and economically operated domestic fuel oil burning device which is capable of producing a hot steady flame by the atomization and combustion of residual or heavy. oils.
It is further an object of my invention to pro: vide a fuel oil burning device which eliminates the need for a mechanical compressor in securing atomization of the oil and which consequently eliminates the employment of moving parts. in accordance with my invention I employ a jet of steam for atomizing the fuel oil at an atomizing nozzle and in order to maintain a quantity of steam at suitable pressures, I provide an automatically controlled steam generator having an independent heating means other than the oil burner device, the steam output of the' generator being maintained'automatically within -fixed limits by means controlling the generator heating means, and the water input, to the generator being contro led in accordance with the water level therein. ther, in accordance with my invention, I employ a portion of the heat developed within the aforesaid steam generator for preheating the oil prior to its passage to the atom'izing nozzle to a relatively high temperature and I control the rate of fiow' of the oil and steam to the atomizing nozzle manually in order to obtain a fixed definite ratio therebetween and also I control the flow of oil and steam to the nozzle automatically in accordance with the temperature of a medium heated by the operation of the oil burning device.
My invention will be more fully understood from a consideration of the following particular description of embodiments thereof, and of the drawings attached thereto, and the features of my invention which I consider to be novel are pointed. out with particularity in the claims ap pended thereto.
. In the drawings:
Fig. l is a general view of an oil burning device of my invention, certain parts thereof being in section, and a control circuit being incorporated therewith;
Fig. 2 is a plan view of the heater plates shown in section in Pig. 1, the upper plate being partially removed to illustrate a portion of the lower plate;
Hg. 3 is a sectional view of a preferred form of atomizing nozzle, showing the oil and steam passages therethroush; and
Fig. 4 is an illustration of an oil burning device employing alternative forms of boiler, heating device, and water control.
In Fig. 1 the numeral l indicates an atomizing nomle which is more clearly shown in Fig. 3. The numeral 2 indicates generally a steam generator to which is connected the steam conduit 3 and the inlet or water'conduit l. The numeral I indicates generally a tank for the storage of a residual or "heavy fuel oil the surface of which is represented at t. g
The steam generator comprises a water boiler formed of a cylindrical casting 1 having the top and bottom members! and I secured thereto by means of the bolts I0 and II respectively. The top and bottom members 8 and 9 are provided with suitable gaskets represented at I2 in order to assure a satisfactory water-tight seal between these members and the cylindrical casting I. The water boiler is mounted on an insulating block I3 preferably of porcelain having a recessed bottom providing a terminal box I4 and the porcelain block I3 is in turn supported on a mounting base I5 adapted to rest on the floor or other support on which the oil burning device is mounted.
The heating element for the steam generator 2 is shown as a pair of spaced plates l5 and I6, spaced apart in a vertical direction and mounted on the porcelain block H which is provided with a plurality of upstanding knobs I8 on its upper The lower plate I6 is provided with suitable apertures adapted to fit over the raised central portions I9 of knobs I8 and permit the lower plate IE to be mounted on the knobs I8. The upper plate I5 rests on the top of the raised central portions I9 of knobs I8 and is thereby spaced from the lower plate l6 at the edges thereof. Lower plate I6 is secured by means of the bolts 20 brazed or otherwise secured to the lower surface thereof and extending downwardly through suitable apertures provided in the porcelain block I1, the lower plate member 9 of the water boiler, and in the porcelain block I3. The block I1 is secured to block I3 by means of the bolt 2| extending downwardly through suitable apertures provided therein and in the lower member 9 of the water boiler and the porcelain block I3.
" The bolt 2| is provided with an enlarged head having a central tapped aperture therein and a screw 22 extends through a suitable aperture provided in the upper plate I5 and through .an enlarged aperture provided in the lower plate I6 and into the tapped aperture in the centre of the head of bolt 2|. Washers are provided between plate l5 and the head of bolt 2| in order to properly space plate I5 from plate Ii at the centre thereof. Bolts 20 and 2| extending intothe terminal box- I4 provide a ready means for connectingthe heating elements I5 and I6 in an electric circuit whichis completed through the water maintained in the steam generator 2.
The generator 2 is provided with a steam outlet 26 to which is connected the conduit 3 extending to the atomizing nozzle I where the steam conduit 3 connects with steam passages provided within the nozzle (shown more clearly in Fig. 3). A pressure operated switch 2'! of well known construction is connected to conduit 3 and is adapted to open and closelits contacts 21a and 21b in response to variations in steam pressure within the generator 2 respectively above and below predetermined limits. A second pressure operated switch 23 is also connected in the steam conduit 3 and is adapted to open and close its contacts 280. and 28b in response to variations in. steam pressure ingenerator. 2 respectively below and above a second pair .of predetermined limits. A solenoid operated valve 29, also of well known construction, is connected in series in the steam conduit 3 and is arranged to be normally closed and to open only upon energization 01' its solenoid. A manually operated valve 30 is also connected in series in conduit 3 and permits a manual adjustment of the rate of flow of steam through the corfduit when the solenoid valve 29 is open.
The water inlet conduit 4 enters the water boiler through the elbow member 3| at a point adjacent the bottom of the boiler and close to theheating elements I5 and I6. A bafile 32 isprovided in the interior of the water boiler in order to prevent splashing of the water directly onto the heating elements I5 and I6, and the water conduit 4 is Wound in a plurality of coils 33 about the steam generator 2 and in good heat transfer relation with the exterior surface of the cylindrical member I in order that the water entering the boiler may be preheated to facilitate the more rapid generation of steam therein and to prevent severe fluctuations in steam pressure therein due to the entrance of cold water. Connected in series with the water inlet pipe 4 are the manually operated valve 34 and the solenoid valve 35. The manually operated valve 34 permits a manual adjustment of the rate of water flow through conduit 4, and the solenoid operated valve is arranged to normally close the conduit 4 and to open only in response to the energization'of its solenoid.
The oil supply tank 5 is arranged at a higher level than the nozzle I and oil is conducted therefrom through an enlarged oil conduit 40, reducer 4|, and oil conduit 42 of reduced section. The oil conduit 42 is wound in a plurality of coils 43 which are supported on the exterior generator 2 in good heat transfer contact therewith, and extends to the atomizing nozzle I, where it connects with the oil passages therein. Connected in series with the oil conduit 42 and adjacent the nozzle end thereof are the solenoid valves 44 and 45 and the manually operated valve 46. Each of the solenoid valves 44 and 45 are arranged to normally completely close conduit 42 and to open only upon energization of their solenoids. The manually controlled valve 46 permits a manual adjustment of the rate of flow of oil in conduit 42 when the valves 44 and 45 are open.
A T-connection 50 is made in the steam conduit 3 adjacent the steam generator 2, to which is connected a conduit 5| of relatively small size which is led back through the reducer 4|, the enlarged oil conduit 40 and up through the oil supply tank 5. The purpose of the conduit 5| is to preliminarily preheat in order to render more fluid the oil in the oil tank and enlarged oil conduit 40. The steam exhaust from the conduit 5| may be employed for humidifying the atmosphere in an enclosed space, such for example as in a room of the house or other structure to be heated.
In order to assure the most eflicient operation of the generator 2 and to prevent the escape of heat from the oil conduit 42 and steam conduit 3, these members are provided with an exterior heat lagging as indicated at 5h Although this heat lagging is shown only around the generator and the coils of conduits 42 and 4 adjacent thereto, it will be apparent that it may be, and in some cases preferably is, extended around the conduits 42 and 3 up to the proximity of the nozzle I.
Steam is generated within the steam genera' surface of the cylindrical casting 'I of steam H and 62 of the relay 63 and also the operating solenoid 64 of a relay 65 having the normally closed contacts 66. Relay 63 is arranged to close its contacts 6| and 62 upon the energization of its operating coil 61. The relay 65 is adapted to open its normally closed contacts 66 whenever current flows between the plates I5 and I6.
A control circuit for the solenoid valve 35 in the water pipe 4 is provided including in series therewith the normally closed contacts 66 of relay 65 and also the contacts 21a and 21b of the pressure switch 21. Thus the solenoid valve 35 is energized to open the water pipe 4 whenever the contacts 66 of relay 65 are closed and the contacts 21a and 21b of pressure switch 21 are also closed.
The contacts 21a and 21b of pressure switch 21 are also included in series in the energizing circuit for relay 63. Thus the relay 63 closes its contacts 6| and 62 to supply heat to the generator 2 in response to the closure of the contacts of pressure switch 21 and water is supplied to the generator 2 whenever the water level within the generator falls below the level of the upper plate I5 thus breaking the circuit between the plates.
Pressure switch 21- is arranged to close its contacts 21a and 21b whenever the steam pressure within the generator 2 falls below a predetermined lowllmit and to retain its contacts closed until the pressure reaches a predetermined upper limit. Thus the pressure switch 21 operates to control the maintenance of the steam pressure within the generator 2 within predetermined limits and also to control the operation of the solenoid valve 35 thereby to control the supply of water to the generator 2 in accordance with the water level therein.
In Fig. 3 I have illustrated one form of nozzle which may be employed in the oil burner device of my invention. The nozzle as illustrated comprises a casing I having therein a steam passage MI and an oil passage I02. The nozzle is provided with a nozzle head I03 having therein a central oil passage I04 terminating in a restricted opening I05. Steam passages I06 communicating with the steam chamber I 01 are also provided in nozzle head I03 and the restricted annular passage I06 located adjacent the oil opening I communicates with the steam chamber I01. When steam under pressure is supplied to the nozzle passages IN a high velocity blast of steam escapes through the annular aperture I03 and when an oil conduit is connected to the nozzle passage I 02 oil dribbles through the oil opening I05 in nozzle head I03 and is caught up in the high velocity steam blast and thereby atomized and thoroughly mixed with the escaping steam. A long narrow blast of atomized oil and steam is thus projected from the nozzle. If it is desired to provide a fan shaped flame steam may be permitted to escape fromthe chamber I01 through the drill holes I03 and peripheral passages IIO which direct the steam in a cone having a greater angle than that escaping from the opening I08. The particular form of nozzle employed is not essential to my invention, it being understood that any form of nozzle which gives a satisfactory atomization and mixing of the oil with the escaping steam may be used.
The blast of steam at high velocity through the annular passage I06, as will be understood by those familiar with the art, tends to reduce the pressure at the oil opening I05. Thus oilis forced from the tank 5 not only by gravity, as
indicated above, but also by the Venturi action of the high velocity steam blast. In order to assure a combustible mixture of oil with the steam in the blast from nozzle I, and to prevent severe variations in the ratio of oil to'steam in the blast, it is necessary to maintain a pressure head of oil at the nozzle at all times during operation. Thus, in the modification illustrated in Fig. 1, the level of the oil supply tank 5 with regard to the oil conduit and nozzle is arranged so that a pressure head of oil is maintained at the nozzle at all times during operation.
The velocity of the steam blast issuing from the annular aperture I03 of the nozzle head is an important factor in obtaining satisfactory atomization of the oil and in obtaining the proper type of flame for eflicient heating, and for any given type of nozzle this velocity is a function of steam pressure generated within the generator 2. I have found that, when employing a nozzle as illustrated in Fig. 3 and in domestic installations wherein the flow of oil ordinarily is about 1 to 2 gallons per hour and does not exceed about gallons per hour during operation, a quiet, steady, efliciently heating flame is obtained when the steam pressure ranges between 5 and pounds per square inch. Preferably I adjust the settingof the pressure switch 21 to control the steam pressures within the generator 2 between the limits of 8 and 11 pounds.
Referring again to Fig. 1, a control circuit is also provided for the solenoid valves 29, 44 and 45 in parallel with one another and also in parallel with the primary winding of the ignition transformer 15 and in series with the contacts 16 and 11 of the thermal or other temperature responsive device 18 arranged to be responsive to temperature variations in a medium to be heated by means of the oil burner in accordance with practices well known in the art. The secondary winding of the transformer 15 is connected to the ignition terminals 13 located adjacent the nozzle I and in the path of a blast of atomized oil and steam from the nozzle. Thus when thermostat 10 closes its contacts 16 and 11 the solenoid valves 29, 44 and 45 are simultaneously operated to permit the flow of high velocity steam and of oil through the nozzle I thereby to secure a blast of atomized oil and steam therefrom. At the same time the terminals 18 are energized thereby igniting the blast of oil' and steam from the nozzle I. When the thermostatic device 10 operates to open its contacts the flow of oil and steam to nozzle I is shut off by the solenoid valves 23, 44 and 45 due to the deenergization of the solenoids thereof, and the terminals 19 are also deenergized. The function of solenoid valve 44 is duplicated in valve 45 .for safety purposes in order to minimize the danger due to failure of either one valves.
The pressure switch 28 is arranged to be responsive to steam pressures within the generator 2, and its contacts a and 261) are connected in series in the common energizing circuit for the of these solenoid valves 23, 44 and 45 and ignition terminals 19, in order that, particularly in starting up the burner, generator 2 may be permitted to build up the proper steam pressure before the valve 23 in conduit 3 is opened. Thus, when pressure switch 21 is set to close its contacts at 8 pounds steam pressure and to open its contacts at 11 pounds, I have found it satisfactory to adjust pressure switch 28 to open its contacts at a low level such'as 3 pounds and to close'its contacts at a level approximating the lower limit of pressure switch Zl-as for example, 8 pounds;
Thus during starting, and at any time during operation, when steam pressure within the generator is lower than, or falls to 3 pounds, pressure switch 28 operates to deenergize the valves 29, 44 and 45 and thus to. prevent the supply of steam at undesired low pressures and oil to the nozzle l. Furthermore during starting, the supply of steam to nozzle l is prevented until the steam pressure attains the lower limit of the desired range of pressures.
In describing the operation of the above described heavy fuel oil burner device it will be' switch 2i completes the circuit for the energizing coil Sl oi? relay 63 which may be traced. as follows: from. left hand line terminal through conductors 80 and ti, contacts Ma and 21b of pressure switch 2?, conductor 82, operating coil 6i of relay 63 to the neutral line conductor 83. Relay 63 thus operates to close its contacts El and 62 thus closing the heating circuit to the heating plates l5 and 86, which may be traced as follows; line conductor 8t, contacts ill of relay 83, conductor 84 to bolt 29 and lower plate 66, upper plate l5, bolt ll, conductor 85, contacts 62 of relay 63, conductor 8t, operating coil 66 of relay 65, conductor St to the right hand line terminal. This circuit is broken between the plates it and it due to the absence of water within the generator 2 and thus the operating coil 6d of relay till: is deenergized and the contacts 56 thereof are closed; The closure of contacts Zia and Z'lb oi pressure switch 2 l also completes a circuit for the solenoid valve 35 in water pipe ,4 which includes in series therewith the normally closedcontacts 5d of relay 65. This circuit extends from the left hand line terminal, conductors 8d and Bi, contacts 2M and ill) of pressure switch 2?, conductor 32, conductor d8, contacts 6%, conductor 89, solenoid valve conductor 5m to the neutral line conductor 33. Thus solenoid valve 35 is energized to open the water pipe 4 and to supply water to the generator 2. When the water reaches the level of upper plate it the energizing circuit for plates iii and it above traced is completed and the operating coil Gd of relay E55 is energized, thus opening the contacts 68 and deenergizing the circuit for the solenoid valve 35. Solenoid valve 35 therefore closes the pipe line 4 to shut off the flow of water to the generator 2. Steam pressure now builds up within the steam generator 2 and when it has reached a predetermined pressure limit as above de-= scribed, the contacts 28d and 28b of pressure switch 28 close. Closure of these contacts completes the energizing circuit for solenoid valves 29, 44 and 45 as follows: from right hand line terminal through conductors Bl and iii, contacts 'lfi'and ll of the thermostat l8, conductor 92, contacts 28a and 28b 01 pressure switch 28 which are now closed, conductor 9e, conductor 95, the solenoid of valve 29, conductor 96 to the neutral line conductor The solenoids of valves M and W are connected in shunt with the solenoid of valve 29 by means oi the conductors aiimoo mains deenergized when relay 63 closes and thus ture of the oil in the conduit d2 should exceed, for
and 98. Theprimary winding of ignition transformer "i5 is also connected in a series circuit with the contacts 16 and ll of thermostat l8 and with the contacts 28a and 28b of pressure switch 28 by means of a circuit which is traced as follows: right hand line terminal through conductor 8i, conductor 9|, contacts 16 and ll of thermostat l8, conductor 92, contactsof pressure switch 28, conductor 93, primary winding of transformer 15, conductor 91 to neutral line conductor 83. Thus when the thermostat contacts l6 and ll and the contacts of pressure switch 28 are closed a blast of atomized oil and steam is delivered from the nozzle l and is ignited by the ignition terminals l9 connected to the secondary winding of transformer l5.
The pressure switch 2! maintains its contacts 21a and 21b closed until the steam pressure within generator 2 reaches a predetermined high limit as above described, when contacts 21a and 21b open. This deenerglzes the coil 61 of relay t3 and opens the heating circuit for the plates I5 and M5 at the contacts 6! and 62 of relay 63. This also deenergizes the coil 64 of relay 65 permitting the contacts 66 to close, but the circuit for solenoid valve 35 is now open at the contacts 2M and 21b of pressure switch 2'! so that this solenoid valve remains closed. When the steam pressure within generator 2 again falls to the lower limit determined by the lower setting of pressure switch 21 this switch again closes its contacts to reenergize relay 63, to close the heating circuit for plates l5 and Hi. This cycle of operation continues until the water level within the generator again falls below the upper plate l5 at which time as above explained relay 65 rethe energizing circuit for the solenoid valve 35 is again completed to supply more water to the generator 2.
If at any time during operation the pressure of steam within the generator 2 falls below the low limit determined by the lower setting of pressure switch 28 this pressure switch again opens its contacts 28a and 28b to deenergize or to prevent the energlzation of the solenoid valves 2'9, 44 and 45 and also to deenergize or to prevent the energization of the transformer 15, until the steam pressure within generator 2 again builds up.
When the desired temperature is obtained in the medium heated by the operation of the oil burner device the thermostatic device 18 as is well understood opens its contacts to decnergize the transformer E5 and the solenoid valves 29. L
M and 45 which then operate to close the steam and oil conduits 3 and 42 respectively.
as has been pointed out above, the oil conduit 4'2, of reduced cross-section, is arranged in a plurality of coils 43, supported on, and in good heat transfer relation with, the exterior surface of the cylindrical casting l of steam generator 2. During the course of its flow through the coils 43, the oil in the conduit 42 acquires a relatively high temperature approaching that of the steam within the generator 2. It has been found that the characteristics and behaviour of the flame at the nozzle i are dependent, particularly in starting, on the temperature of the oil in conduit 42; too low a temperature causes a gusty, intermittent or inefficient flame, and, if the temperature is much too low may prevent ignition altogether. It is my present belief, although I do not wish to be limited thereto, that the temperamost satisfactory operation of the oil burner, a temperature of about 175 F.
In Fig. 4 I have illustrated an alternative form 'of steam generator employing a well known form of immersion unit as a heating element and further employing a pair of float valves for controlling the flow of water into the steam generator. The steam generator shown in Fig. 4 comprises a casting I40 provided with an upper closure member'or plate I II secured thereto by means of the screws H2 and having the gasket H3 therebetween. The member I40 is provided with a steam outlet 26 to which is connected the steam conduit 3 which is connected at its end to the nozzle I. A water inlet pipe 4 is also connected to a suitable opening provided in the member I40 to deliver water interiorly oi the generator 2. The
,Water inlet pipe is connected within the generator to the inlet of the float controlled valve II4 the outlet II5 of which is connected to the inlet of the second float control valve IIB. Each of the valves H4 and H0 is provided with a float illustrated respectively at H1 and H8 and as will be obvious, each is adapted to control the flow of water into the generator in accordance with the level of the water contained therein.
The heating element II! for thegenerator 2 comprises a well known form of immersion heating unit mounted within the generator and adapted to be connected to an electrical circuit through the terminal chamber I20.
The oil conduit 42 is wound in a plurality of coils 43 which are mounted on and securedto the exterior of the member I40 in good heat transfer relation therewith and one end of the conduit 42 is connected to the nozzle I in communication with the oil passages therein. Connected in series with'the oil 'conduit are the solenoid valves 44 and 45 and the manually controlled valve 46. Connected in series with the steam conduit 3 are the pressure switches 21 and having contacts 21a and 21b and 28a and 28!) respectively, the solenoid operated valve 29, and the manually operable valve 30.
Because of the use of an immersion heater and also because of the employment of the float controlled valves for controlling the flow of water into the generator the control circuit for the generator of Fig. 4 is considerably simplified. The immersion heater is connected in series across the power supply source through the contacts 210 and 21b of, the pressure switch 21. Thus the heat supplied to the generator 2 is controlled directly by the operation of the pressure switch 21 in response to steam pressure within the generator. The solenoid valves 29, 44 and 45 and the ignition transformer 15 are controlled d rectly by the joint operation of the thermostat device 10 and the pressure switch 28 in the manner fully explained above in connection with Fig. l.
In describing the operation of the apparatus illustrated in Fig. 4 it will be initially assumed that no water has been admitted to the generator 2, that the thermostatic device 18 has cosed its contacts 16 and 11, and that the main switch 00.
has been closed. Under these circumstances the contacts 28a and 28b of pressure-switch 20 are open and the contacts 21a and 21b of pressure switch 21 are closed. Moreover each of the floats H1 and H8 are depressed thereby opening the valves H4 and H6 to permit water to flow into the steam generator 2. When the water has reached a desired level valves H4 and H6 operate to shut oi! the flow of water. Since pressure switch 21 is closed current is supplied to the immersion heating element I I0 to thereby evaporate the water in the generator 2 and to generate steam pressure therein. Pressure switch 21 remains closed until a desired maximum pressure within the generator 2 is obtained at which time these contacts open to shut off the heating circuit. The contacts of pressure switch 28 remain open until thesteam pressure within the generator 2 reaches a desired level determined by the upper setting of the pressure switch 20 as described above, and when this point has been reached contacts 28a and 28b close to energize a circuit for the solenoids 20, 44 and 45 and for the ignition transformer 15. A blast of atomized oil and steam is thus projected from the nozzle I and ignited by means of the ignition terminals 19 and continues so long as the thermostat contacts 1G and 11 remain closed. When a desired temperature of the medium to be heated by the oil burning device of my invention has been attained contacts 15 and 11 of thermostat .18 open to thereby deenergize thevalves 29, 44 and 45 and to close the conduits 3 and 42.
While in accordance with the patent statutes I have described in detail an embodiment of my invention I do not wish to be limited thereto and aim in the appended claims to cover all such modifications of my invention as may occur to those skilled in the art and which fall within the true scope of my invention.
What I claim as new and desire to secure by Letters Patent of the United States, is:
1. In a burner for non-volatile residual fuel oils of high viscosity at ordinary temperatures, the combination of a nozzle, a steam generator, a steam conduit connecting said generator to said nozzle, and an independent heating device associated with said generator, with an independent means responsive to steam pressures within said generator for controlling the operation of said generator whereby to maintain within said generator steam pressures within predetermined upper and lower limits and to provide a substantially constant blast of steam at said nozzle during the operation of the burner, an oil conduit connected to said nozzle, and means supplying oil to said conduit and maintaining a pressure head of oil at said nozzle, said oil conduit having a portion adjacent saill fuel oil supply adapted for the free flow of such oil therethrough at ordinary temperatures and another portion arranged in intimate heat transfer relation with the steam within the generator, whereby the oil therein acquires a relatively high temperature approaching that of the steam.
2. In a burner for non-volatile residual fuel oils of high viscosity at ordinary temperatures, the combination of a nozzle, a steam generator, a steam conduit connecting said generator to said nozzle, and an independent heating device associated with said generator, with an independent means responsive to steam pressures within said generator for controlling the operation of said generator whereby to maintain within said generator steam pressures within predetermined upper and lower limits and to provide a substantially constant blast of steam at said nozzle during the operation of the burner, an oil conduit connected to said nozzle, and means supplying oil to said conduit and maintaining a pressure head of oil at said nozzle, a portion of said oil conduit adjacent said fuel oil supply being provided with means for maintaining a free flow of said oil and a steam conduit connecting said generator to said nozzle, with an oil conduit connected to said nozzle, and means supplying oil to said conduit and maintaining a pressure head of oil at said nozzle, said oil conduit having a portion adjacent said fuel oil supply adapted for the free flow of such oil therethrough at ordinary temperatures and another portion arranged in intimate heat transfer relation with the generator whereby the oil therein acquires a relatively high temperature approaching that of the steam.
ipln a burner for non-volatile residual fuel oils of high viscosity at ordinary temperatures, the combination of a nozzle, a steam generator, and a steam conduit connecting said generator to said nozzle, with an oil conduit connected to said nozzle and means supplying oil to said conduit and maintaining a pressure head of oil at said nozzle, a portion of said oil conduit adjacent saidr fuel oil supply being provided with means for maintaining the free flow of such oil therethrough and another portion arranged in intimate heat transfer relation with the generator whereby the oil therein acquires a relatively high temperature approaching that of the steam.
5. In a burner for non-volatile residual fuel oils of high viscosity at ordinary temperatures, the combination of a nozzle, a steam generator, and a steam conduit connecting said generator to said nozzle, with an oil conduit connected to said nozzle, and means supplying oil to said conduit and maintaining a pressure head of oil at said nozzle, said oil conduit having a portion adjacent said fuel oil supply adapted for the free .fiow of such oil therethrough at ordinary said nozzle, said oil conduit having a portion of relatively large cross-section adjacent said fuel oil supply adapted for the free flow of such oil therethrough and another portion of relatively small cross-section and arranged in intimate heat transfer relation with the generator whereby the oil therein acquires a relativelyhigh temperature approaching that of the steam. v
7. In a fuel oil burner, the combination of a nozzle, means comprising a source of oil and an oil conduit for maintaining a pressure head of oil at said nozzle, a steam generator, a steam conduit connecting said generator to said nozzle and an independent heating device associated with said generator, with an independent means responsive to steam pressure within said generator for controlling the operation of said independent heating device to maintain steam pressures within said generator within predetermined upper and lower limits and to provide a substantially con-a stant blast of steam at said nozzle during the operation of the burner, whereby a substantially constant ratio of steam to oil is maintained in the blast from the nozzle.
8. In a fuel oil burner, the combination of a nozzle, means comprising a source of oil and an oil conduit for maintaining a pressure head of oil at said nozzle, a steam generator, a steam conduit connecting said generator to said nozzle; and an independent heating device associated with said generator, with an independent means responsive to steam pressures within said genera tor for energizing and de-energizing said independent heating device to provide a substantially constant blast of steam at said nozzle during the operation of the burner, whereby a substantially constant ratio of steam to oil is maintained in the blast from the nozzle.
9. In an automatic oil burner comprising a nozzle, means comprising a source of fuel oil sup ply and an oil conduit for maintaining a pressure head of oil at said nozzle, a steam generator, a conduit connecting said generator to said nozzle, an independent heating device associated with said generator, means responsive to steam pressures within said generator for controlling the operation of said generator, and a water conduit connecting said generator to a source of water supply, said water conduit having a portion coiled about the generator in intimate heat transfer relation therewith for preheating the water therein to prevent undesirable pressure fluctuations within the generator, whereby substantially constant predetermined steam pressures are maintained within said generator and a substantially constant ratio of steam to oil is maintained in the blast from the nozzle during operation of the burner.
10. In an oil burner, the combination of a nozzle, an oil conduit connecting said nozzle to a supply of fuel oil, a steam generator, a steam conduit connecting said nozzle to said steam generator, an independent heating device for said generator, means responsive to steam pressures within said generator for controlling the operation of said heating device to maintain steam pressure within said generator within predetermined upper and lower limits, valves, in said oil and steam conduits, a thermal responsive device, and means responsive to the operation of said thermal responsive device for actuating said valves to produce a blast of atomized oil and steam from said nozzle.
11. In an oil burner, the combination of a nozzle, an oil conduit connecting said nozzle to a source of fuel oil, a steam generator, a conduit connecting said nozzle'to said steam generator, an independent heating device for said generator, means responsive to steam pressures within said generator for controlling the operation of said heating device to maintain steam pressures within said generator within predetermined upper and lower limits, 9. thermal responsive device, valves located in said oil conduit and said steam conduit, means responsive to the operation of said thermal responsive device for actuating said valves to control a blast of atomized oil and steam from said nozzle, and means for controlling said latter mentioned means in accordance with predetermined pressure conditions in the steam generator.
12. In anoil burner, the combination of a nozzle, an oil conduit connecting said nozzle to a 4 source of fuel oil, a steam generator, an independent heating device for said generator, means responsive to steam pressures within said generator for controlling the operation 01' said heating device to maintain steam pressures within said generator within predetermined upper and lower limits, a thermal responsive device. normally closed valves located in said oil and steam conduits, means responsive to the operation of said thermal responsive device for opening said valves to permit the discharge of a blast 0t atomized vsteam and oil from said nozzle, and means for rendering inoperative said last mentioned means whenever the steam pressure within said generator falls below a predetermined value.
13. In an oil burner, the combination of a nozzle, an oil conduit connecting said nozzle to a source of fuel oil, a steam generator, a conduit connecting'said nozzle to said steam generator, an independent heating device for said generator, means responsive to steam pressures within said generator for controlling the operation of said heating device to maintain said pressures within a predetermined limited range, a thermal responsive device, valves located in said oil conduit and said steam conduit, means responsive to the operation of said thermal responsive device for actuating said valves to control a blast of atomized oil and steam from said nozzle, and another means responsive to steam pressures within said generator for rendering inoperative said last mentioned means when said steam pressure falls below a limit lower than said predetermined limited range and subsequently rendering operative said last mentioned means only when steam pressure has risen to said predetermined limited range.
THOMAS LESLIE MAY.
US100759A 1936-09-14 1936-09-14 Domestic heavy oil burner Expired - Lifetime US2117190A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599924A (en) * 1946-02-06 1952-06-10 Lafleur Sinai Dual steam generating apparatus
US2700945A (en) * 1950-11-17 1955-02-01 Harold S Hill Combined humidifier and preheater of air for combustion apparatus
US20050065823A1 (en) * 2003-09-23 2005-03-24 Siemens Medical Solutions Usa, Inc. Method and apparatus for privacy checking

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599924A (en) * 1946-02-06 1952-06-10 Lafleur Sinai Dual steam generating apparatus
US2700945A (en) * 1950-11-17 1955-02-01 Harold S Hill Combined humidifier and preheater of air for combustion apparatus
US20050065823A1 (en) * 2003-09-23 2005-03-24 Siemens Medical Solutions Usa, Inc. Method and apparatus for privacy checking

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