US2256080A - Oil burner - Google Patents

Description

P 16, 1941- K. K. H. EWERYD ETAL 2,256,080

OIL'BURNER Filed Oct. 5-, 1959 Patented Sept. 16, 1941 "on. BURNER Knut Karl Herman Eweryd and Tor Axel fidman, Karlskrona, and Lars Axel Widing, Stockholm, Sweden, assignors to Aktiebolaget Giitaverken, Gothenburg, Sweden, a corporation of Sweden Application October 5, 1939, Serial No. 298,063 In Sweden April 4, 1939 (Ci. zoo -122) 9 Claims.

I is adapted to rotate and to bring the oil deposited thereon to the interior of a housing surrounding the catching means, from which said oil is removed without entering the combustion zone of the burner. Further features of the invention are i set forth in the following specification and claims.

In the accompanying drawing some embodiments of the invention are illustrated by way of example. I

Fig. l is a vertical section of a water heating plant provided with an oil burner according to one embodiment of the invention.

Fig. 2 is a longitudinal section of a. burner housing according to another embodiment of the invention. and v Fig. 3 is a section on line III-III in Fig. 2.

Fig. 4 is a longitudinal section of a burner housing according to a furtherembodiment of the invention.

Fig. 1 illustrates a heating apparatus I having a combustion chamber 2 and a combustion gas outlet 3 and provided with an opening 4, in which the front end of an oil burner'housing 5 is inserted and secured. The burner housing 5 is formed by the front'end of a casing 6 carried by a support I and containing an electric motor 8, a combustion air fan or blower 9 and. an oil pump 10 such as a gear pump. The fan, the motor and the pump are mounted on a tubular shaft ll, whiel i gjournalled in the casing 6 and which g, b n. oil catching drum l2 at the front end, which drum is enclosed in a stationary housing I 3, ..--An atomizing nozzle 14 of any type and preferably with adjustable spraying, angle, for instance of the type described in ourco-pending application No. 298,062, is provided within the drum i2 and oil is supplied to said atomizing nozzle through a hollow stem l5 extending within the tubular shaft II and connected to a fuel supply control-device l6 adapted for controlling the oil quantity injected in the combustion chamher :2, said' control device being, for instance, of the type illustratedin Figs. 1, 6 and 7 of our co-pending application No. 298,062. A fuel oil tank I I is connected with the oil pump I0 through a supply conduit l8 and the oil pump I0 is connected with the fuel supply control device I6 by means of a conduit IS. The oil, which is caught by the drum l2, gathers in the peripheral portions of said drum and escapes through openings 20 at the largest diameter'of the drum and is thrown towards the walls of the housing l3 and drained off through a conduit 2|, which conducts the superfluous oil back to the oil tank H. A thermostatically controlled switch 22 is inserted in the circuit 23 of the electric motor 8 and cuts out the motor, when the temperature of the combustion gases in the outlet 3 falls below a predetermined temperature. A thermostatic control device 24 is disposed with the temperature sensitive member in the water jacket of the heating apparatus l and actuates the control device l6 through the intermediation of a flexible cable 25 and automatically controls the oil supply to the combustion chamber 2 by variation of the spraying angle of the nozzle according to prevailing water temperatures.

Figs. 2 and 3 illustrate a further embodiment of an oil burner according to the invention, which comprises a burner housing 26 provided with a flange 21 for securing the burner in an opening in the wall of a combustion chamber such as the opening 4, Fig. 1. The burner housing 26 contains a stationary nozzle housing 28, in which a nozzle' 29 preferably with adjustable spraying angle, for instance of the type illustrated in Figs. 6 or 9 of our co-pending application No. 298,062, is disposed. An oil catching drum 30, which tapers slightly towards the nozzle 29, is journalled co-axially with the jet 3| by means of a ball bearing 32 carried by the nozzle housing 28.

' The oil catching drum 30 is connected with the tubular shaft 33 by means of a collar 34, which is provided with a guide rim 35, which guides a portion of the combustion air flowing through the housing 26 around the collar 34 into openings 35 in the collar 34 and through openings 31 in the nozzle housing 28 into the interior of the nozzle housing. Said air is mixed with the oil delivered by the nozzle and eliminates the formation of a vacuum in the nozzle housing, which might jeopardize the operation of the nozzle. The oil, which is deposited on the inner surface of the catching drum 30, is moved towards the large end of said drum by the centrifugal force and by the action of the jet and gathered at the large end of the drum, which is in an annular housing 45, in which the superfluous oil deposited on the inner surface of the drum It is accumulated and from which said 011 is forced back to the oil tank or the oil pump it through a conduit 4| due to the pressure caused by the pump action of the blades 39. .An annular deflecting plate 42 is provided in the opening of the housing 25 and connected with the housing 40 by means of ribs 43 and with the burner housing 26 by means -of guide vanes 44, which may be disposed tangentially so as to'imply a rotational movement to the air passing said guide vanes.- Fig. 4 illustrates a further embodiment of a burner according to the invention, which comand adjacent to the path of the oil jet delivered by the nozzle and adapted to catch portions of said oil jet and upon rotation to convey said portions to the interior of said housing, and means for removing said oil from the interior of "said housing, whereby it is prevented from enprises a burner housing 45 provided with a flange 44 for securing the burner in an opening in the combustion chamber of a heating apparatus such as the opening 4 in Fig. 1. A rotatable catching drum 4'! is journalled by means of a ball bearing 48 on a nozzle 4! with adjustable spraying angle, said drum being driven from the motor of the burner by means of a tubular shaft 50. The drum 41, which also forms the nozzle housing, is provided with openings 5| adjacent the oriflce of the nozzle, through which openings air is admitted to the interior of the drum 4'| and the space surrounding .the oil jet 52. The drum 4'! tapers slightly towards the nozzle 49 and at the large end of said tapering portion the drum is continued by a wall 53, which is disposed transversely to the path of the oil jet 52 and provided with a central opening 54 forming a passage for the central portion of the jet into the combustion chamber. The wall 53 forms inwardly and outwardly directed flanges at the opening 54 serving to throw oil gathered thereon to the peripheral portions of .the drum and into the combustion chamber, respectively. The portion of the drum, which has the largest diameter, is provided with openings 55 and on the outside of said portion of the drum blades 56 are provided, which run in an annular housing 51 carried by the burner housing 45 and provided with .a 'conduit 58 for leading the oil accumulated in the housing 51 back to the oil tank or the pump II. Guide vanes 59 and ill and a deflector plate II are provided in thepath of the combustion air. adjacent the opening of the burner housing 45 in similar manner as previously described with reference to Figs. 2 and 3. The oil, which is deposited on the inner surface of the drum 4'! is v forced by the centrifugal force towards the openings and thrown out through said openings into the annular space formed by the housing 51, and the blades 55, which act as pump blades.-

' means may for instance also be varied by'longitudinal displacement of the nozzleor by other means. 1

What we claim is: 1. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle, a housing, a rotatable oil catchingmeans disposed within said housing -tering the combustion zone of the oil burner.

2. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle. a housing, a rotatable oil catching drum disposed within said housing and in front of the nozzle with the axis of rotation coinciding with the axis of the oil jet delivered by the nozzle and adapted to catch portions of said oil jet and upon rotation to convey.

said portions to the interior of said housing, and means for removing said 011 from the interior of said housing, whereby it is prevented from entering the combustion zone of the oil burner.

3. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle, 9. housing, a rotatable oil catching drum of truncated cone shape disposed within said housing and in front of the nozzle. with thesmall end adjacent to the nozzle and adapted to catch portions of the oil jet de-' livered by the nozzle and upon rotation to convey said portions to the interior of saidhousing, and means for removing said oil from the interior of said housing, whereby it is prevented from entering the combustion zone of the oil burner.

4. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle, a housing. a rotatable oil catching drum disposed within said housing and in front of the nozzle with the axis of rofrom the interior of said housing, whereby it is prevented from entering the combustion zone of the oil burner.

5. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle, a housing, a rotatable oil catching drum within said housing and formed by two portions of truncated cone shape joined at their large ends, and oiloutlet openings in the wall of said drum adjacent the connection between said portions, said drum being disposed in front of the nozzle with one end adjacent to the nozzle and adapted to catch portions of the oil jet delivered by the nozzle and upon rotation to convey said caught portions to the interior of said housing, and means for removing said oil from the interior of said housing, whereby it is prevented from entering the combustionzone of the oil burner.

6. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle, a stem carrying the nozzle and forming a supply conduit to the nozzle, a housing, a rotatable oil catching means disposed within said housing and adjacent to the path of the oil jet deliveredby the nozzle and adapted to catch portions of said oil jet and upon rotation to convey said portions to the interior.

I prevented from entering the combustion zone of the oil burner, a rotatable tubular shaft enclosing said stem and the nozzle and carrying said oil catching means, and a means for rotating said Y tubular shaft.

7. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle, a housing, a rotatable oil catching drum disposed within said housing and in front of the nozzle with the axis of rotation substantially coinciding with the axis of an oil jet delivered by the nozzle and adapted to catch portions of said oil Jet, said drum being so shaped that the internal diameter increases from a portion of the drum adjacent the nozzle to a large portion of the drum more remote from the nozzle, an annular channel formed by said housing and disposed around said large portion of the drum and adapted to receive superfluous oil gathered at the large portion of the drum, and means for conducting away oil received by said channel or groove.

8. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle, a housing, a rotatable oil catching drum disposed within said housing and in front of the nozzle with the axis of rotation substantially coinciding with the axis of an oil jet delivered by the nozzle and adapted to catch portions of said oil jet, said drum being so shaped that the internal diameter of the drum increases from a portion of the drum adjacent the nozzle to a large portion of the drum more remote from the nozzle, an annular groove formed by said housing and disposed around said large portion of the drum and adapted to receive superfiuous oil gathered at the large portion-oi the drum, an external annular flange on said large portion of the drum registering with said groove, and means for conducting away oil gathered in said groove.

9. In an oil burner, a nozzle for atomizing fuel oil supplied to said nozzle, a housing, a rotatable oil catching drum disposed within said housing and in front of the nozzle with the axis of rotation substantially coinciding with the axis of an oil Jet delivered by the nozzle and adapted to catch portions of said oil Jet, said drum being so shaped that the internal diameter of the drum increases from a portion of the drum adjacent the nozzle to a large portion of the drum more remote from the nozzle, an annular groove formed by said housing and disposed around said large portion of the drum and adapted to receive superfluous oil gathered at the large portion of the drum, a number of pump blades provided on the outside of said large portion of the drum and engaging said groove, and means for conducting away oil gathered in said groove.

rrNUT KARL HERMAN EWERYD. TOR AXEL 6pm. mas axnr. WIDING.

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