US2090267A - Burner for liquid fuels - Google Patents

Description

Aug. 17, 1937. c. PULEJO ET AL 2,090,267

BURNER FOR LIQUID FUELS Filed Sept. 25, 1956 INVENTORS. CARLO PUL.EJO

JEAN STAUB Patented Aug. 17, 1937 PATENT OFFICE BURNER FOR LIQUID FUELS Carlo Pulejo, Lausanne, and Jean Staub, Pully-Lausanne, Switzerland Application September 25, 1936, Serial No. 102,580 In Switzerland August 24, 1935 1 Claim.

This invention relates to a burner for liquid fuels.

In the improved burner, which is of simple and sturdy construction no material other than metal is employed at all points where such other materials may develop defects by contact with the liquid.

The annexed drawing illustrates an example of construction of the invention.

Fig. l is a vertical longitudinal section of a diffuser adapted to be attached to a casing which encloses the assembly of control members.

Fig. 2 is a vertical longitudinal section of the casing, to which the diffuser of Fig. 1 is to be attached.

Fig. 3 illustrates on a larger scale in end view the fuel spraying nozzle.

Fig. 4 is a rear elevation, on a smaller scale, of the assembled burner.

The diluser is adapted to be connected to the casing 2 by means of bolts I and the nozzle comprises a conical valve body 3, the rod 5 of which is adjustable within a fuel supply tube l. Tube l has external vanes 6 in contact with the inner walls of a tubular nozzle l. Rod 5 is also provided with vanes in contact with the interior of the fuel supply tube 4.

The atomizing agent, for example air, and the fuel are fed to the burner by known means, the former through a duct 8 and the latter through a duct 9 The duct 8 communicates with the free space between the nozzle i and the tube 4, while the duct 9 communicates with the free space between the tube 6 and the rod 5 of the valve body 3. The base of the conical valve body 3 is of larger diameter than its rod 5. The rod 5 may be screwed more or less into the fixed stuffing box member lll, so as to allow of simultaneous adjustment of the flow of fuel and the flow of the air, the position of the nozzle l and of an air intake cone ll being fixed during manufacture. This atomizing nozzle gives very good results. The oil flows all round the rod of the conical valve body 3 and the air from the duct 8 passes all round the point of the valve body 3.

At 15 (Fig. 1) and at I6 (Fig. 2) bafile devices are disposed adapted to very considerably reduce the noise incidental to the operation of the burner. Each of these devices comprises two groups of bales, which may be adjusted more or less closely to one another. One group of bafiles are adjustably secured to the diffuser by screws Il and l8 which pass through slots in the flange l9, the slots being eccentrically disposed so as to cause the flange to move longitudinally when the same is rotated through a certain angle.

At 20 (Fig. 2) an aperture is formed which is useful for reaching the members to be adjusted during mounting, this aperture being adapted to be covered by a metal band 20 retained in position by elasticity.

For the automatic operation of the burner elec tromagnets 2| and 22 are provided which cause a lever 23 to rock in one direction or the other under the action of a thermostat having a mechanical control device of any known construction. The movement of the lever 23 results in the threaded rod 5 of the valve body 3 being rotated in one direction or the other by means of connecting rods 24, 25, whereby the supply of air and fuel is automatically controlled. The arrangement is such that the supply of fuel is never cut off completely, so that instead of being extinguished the burner operates with a pilot flame. This is easily arranged by means of an abutment corresponding to the minimum fuel supply. A further abutment may correspond to the maximum fuel supply so as to avoid a predetermined calorific capacity from being exceeded.

Where the control is not automatic and is effected by hand, it is advisable to completely close the fuel outlet when shutting down, so as to avoid fuel leakage.

What we claim as our invention and desire to secure by Letters Patent of the United States is A device of the character described, comprising in coaxial disposition a conical valve body, a shaft therefor, a fuel supply tube surrounding and spaced from said shaft, a nozzle tube surrounding and spaced from said fuel supply tube. said nozzle tube having its outlet end constricted to form a conical seat for said conical valve body, the outlet end of said fue] supply tube being spaced from the conical seat of the nozzle tube to provide a flow path for a fluid between said nozzle tube and the fuel supply tube, means for introducing liquid fuel into said fuel supply tube about said shaft, means for introducing a spraying medium between said fuel supply tube and said nozzle tube, the said conical valve body having a base of greater diameter than that of said shaft, so that fuel flows all around said base and flows together with the atomizing agent between the said valve body and said seat, the base of said valve body being of substantially the same diameter as that of the fuel supply tube, and means for moving said shaft and said valve body axially between the seat on the nozzle tube and the end of the fuel supply tube to regulate the flow of fuel and atomizing medium.

CARLO PULEJO. JEAN STAUB.

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