US2156578A - Preheater for liquid fuel burners for heating or lighting apparatus - Google Patents

Description

y 1939- 1 A. ANDERSEN 2,156,578

PREHEATER FOR LIQUID FUEL BURNERS F'OR HEATING OR LIGHTING APPARATUS Filed Sept. 28, 1957 Patented May 2, 1939 PATENT OFFICE PREHEATER FOR LIQUID FUEL -BURNERS FOR HEATING 0R LIGHTING APPARA- TUS Anton Andersen, Copenhagen, Denmark Application The invention relates to fuel mixing devices for burners used for heating and lighting.

This is an improvement in that type of apparatus in which fuel is fed to preheating devices directly from the fuel tank of a main burner, and

in which tank compression is generated, by any suitable compressing means or pump. It is known that particularly good atomization is obtained in the preheating device when air is in-.

troduced through a small bore at an angle of 90 to a fuel duct of still smaller bore.

Such devices have been made by securing together pipes by soldering or otherwise, and also by using solid blocks having the necessary ducts therein, but soldering and the drilling necessary to form the ducts are commonly attended by trouble due to clogging by waste material, and by l drilling chips and frequently the drilling is a matter of inconvenience because of the location.

The improvement is directed particularly to structures in which a blast of fuel is burned as it is discharged from an orifice, and such fiame is shielded laterally by being projected through a tubular shell at the end of which it may impinge a on the usual evaporation burner, as for example that of a stove, such action being continued until the latter burner becomes hot enough to function. I

. An advantageous construction is provided by using a two-part devicefiin which one element is secured to the wall of a chamber which in turn is connected to a fuel tank and the second part is mounted for rotatable adjustment with respect to said first part, both parts having ducts which are brought into ported communication with each other when the device is in active use.

By the use of the present inventiomthere is obviated the necessity of drilling and soldering, which, in other constructions frequently requires work in inconvenient positions and places. Likewise, the present invention avoids the diificulties resultant of the use of solder and acid common to some forms of equipment.

Another important advantage is to be found in the fact that when making the device of the presable element, both of which have ducts which are adapted to be brought into registry. In the inserted packing ring 6.

' alignment with the fuel duct 9 at its discharge part of the fixed plate]. The air supply duct l0 September 28, 1937, Serial No. 166,165 In Germany August31, 1936 4 Claims. (01. 158-81) assembly, one duct containing element is firmly secured to a support and to that first element is fitted a nozzle or atomizing body, the mounting of the latter being preferably pivotal so that a limited rotaftable adjustment between the atomizing body and the fixed element is permissible whereby the ducts in the respectiveelements may be brought into registry when the device is operated. The rotatable adjustment may be said to include a sliding relation in that the movable element slides on the face of the fixed element.

The nozzle or atomizing element is moved between two predetermined positions, namely, the operating position and the closed position, in the latter of which the duct apertures will fully or partly be closed and which latter position ,is essential when the device is temporarily idle.

The foregoing and additional features are illustrated in the accompanying drawing and described and claimed in the following specification and claims, in which:

Fig. 1 is a sectional view through a device having a nozzle body mounted for rotatable adjustment; and

Fig. 2 is a sectional view through a device, similar to that shown in Fig. 1, but having a. modified formcf mounting for the rotatable element.

In the drawing, I designates the wall of a cylindrical chamber 2, which latter carries atthe bottom a couplingnut 3 which can be screwed by means of the thread 4 to a filler on the fuel tank of a stove (not illustrated). using liquid fuel, so that the chamber 2 is adapted to form an air tight connection with the filler by means of an The chamber 2 can be sealed at the top by means of a threaded cap (not shown) of the filler, which latter is screwed onto a threaded portion 5 at the top of the chamber 2. On the wall I of the chamber 2 a fixed plate or element 1 is attached to which an atomizing body 8, having the fuel supply duct 9 and the air supply duct ill, is pivotally secured. At the end of an arm II, which is rigidly connected to the atomizing-body B, a flash tube 52 of any usual construction is attached, its axis being in point.

The fuel is fed to the duct 9 through a tube I3, which is adapted to dip into the fuel tank .of the main burner (not shown) and leads to the lower r communicates with the chamber! through an aperture M in the wall I, and thus also with the interior of the fuel tank. In the interior of the atomizing body 8, the fuel in the duct 9 encounters air in the duct l0, and under the influence of the air, the fuel is discharged in atomized condition through an opening 8 in the outer face of the element 8 in the form of an inflammable atomized mixture, which, on ignition, is capable of serving for priming the main burner. It will be noted that the fixed element 1 is secured to the chamber wall I as by being soldered, and that the fixed element is provided with the air duct l6 and fuel duct l1. These ducts communicate with the fuel and air supply ducts l and 9 of the nozzle body 8 when the latter is in its operative position. 1 However, when the nozzle body 8 is turned. so that the ducts are out of registry, the adjacent ends of the respective ducts in the nozzle body and fixed element are not in ported communication and accordingly the nozzle body does not function to atomize or otherwise discharge fuel.

It is of great importance that the nozzle or atomizing body 8 should have a fluid and airtight fit against the surface of the plate 7 in order that the air and fuel in the ducts may be controlled. For that purpose, a'resilient packing, as for example a thin gasket, may be used, each duct having its respective individual gasket.

In the construction shown in Fig. 1, the gaskets are of the simpest possible form, being flat disks l5. which are positioned between the fixedand movable parts of the devic According to the construction shown in Fig. 2, in lieu of the thin-gaskets shown in-Flg. 1, the packing means is illustrated in the form of rings l8, positioned in grooves, being the enlarged ends of the ducts l6 and I! in the fixed element and on that .face of the latter next adjacent the nozzle body 8. In this assembly, the gasket rings l8 are adapted to project slightly beyond the face of the fixed element 1 to engage the adjacent face of the nozzle body 8.

The nozzle body 8 in the constructions. shown in both Figures 1 and 2 is mounted for limited rotatable movement when actuated by means of a handle 21. According to Fig. 1, theinstallation includes a cap nut l9 which grips a collar 20 on the nozzle 8 and is threadedly secured to the periphery of the fixed element I. When the cap nut I9 is sufliciently tightly screwed up to exert adequate pressure against the gaskets IS, the set screw 2| may be tightened against the threads of the fixed element 1 to prevent any accidental loosening. The pivotal mounting of the nozzle body 8 includes also a stub shaft 22 formed as a continuation of the nozzle body 8 and which projects into a central opening 23 in the body of the fixed element 1.

The mounting of the construction shown in Fig. 2 differs from that of Fig. 1 in that in lieu of the cap nut fastening, a central axle pin 24 extends through the length of the fixed element 1 and projects therebeyond past the chamber wall I and into the chamber 2. The inwardly projecting end carries a pair of nuts 25, which serve, when tightened, to hold the nozzle body 8 firmly against the gaskets. .A spring washer 26, if desired, may be placed between the wall I and the nuts 25.

I claim:

1. A device for atomizing liquid fuel comprising a first block element having ducts therein for the passage of air and fuel respectively, a second block element constituting a nozzle member having ducts therein for the passage respectively of air and fuel and adapted to be brought into registry with said ducts in said first block element. said block elements being positioned substantially face to face and said ducts in each element opening out on that face of their respective elements next adjacent the near'face of the other element, one of said elements being mounted for .relative adjustment about an axis common to both elements, andmeans for holding said elements toward each other while yet permitting said adjustment about an axis.

2. A device for atomizing liquid fuel comprising a first block element having ducts therein for the passage of air and fuel respectively, a second block element constituting a nozzle member having ducts therein for the passage respectively of air and fuel and adapted to be brought into registry with said ducts in said first block element, said block elements being positioned substantially face to face and said ducts in each element opening out on that face of their respective elements next adjacent the near face of the other element, one of said elements being mounted for relative adjustment about an axis'common to both elements, means for holding said elements toward each other while yet permitting said adjustment about an axis, and a casing connected to a source of air under pressure, supporting said first block element and the interior of said casing being in ported communication with the said air duct of said first element.

3. A device for atomizing liquid fuel comprising a first block element having ducts therein for .the passage of air and fuel respectively, a second block element constituting a nozzle member having ducts therein for the passage respectively of air and fuel and adapted to be brought into registry with said ducts in said first block element, said block elements being positioned substantially face to face and said ducts in each element opening out on that face of their respective elements next adjacent the near face of the other element, one of said elements being mounted for relative adjustment about an axis common to both elements, means for holding said elements toward each other while yet permitting said adjustment about an axis, and a flash tube at that side of said nozzle member opposite to said first 1 block element and spaced from said nozzle member and comprising a tubular shell with the opposite end openings thereof substantially aligned with the outlet opening of said nozzle.

4. A device for atomizing liquid fuel comprising a first block element. having ducts therein for the passage of air and fuel respectively, a second block element constituting a nozzle member having ducts therein for the passage respectively of air and fuel and adapted to be brought into reg-' istry with said ducts in said first block element, said block elements being positioned substantially face to face and said ducts in each element opening out on that face of their respective elements next adjacent the near face of the other element, one of said elements being mounted for relative adjustment about an axis common to both elements, means for holding said elements toward each other while yet permitting said adjustment about an axis, and gaskets concentric with the outlet openings of said ducts in said first block element and in slidable engagement with the face of said nozzle element.

ANTON ANDERSEN.

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