US1435991A

US1435991A - Combination gas and oil burner

Info

Publication number: US1435991A
Application number: US253306A
Authority: US
Inventors: Wilbur W Stevenson; Owen H Bathgate
Original assignee: Anthony Co
Current assignee: Anthony Co
Priority date: 1918-09-09
Filing date: 1918-09-09
Publication date: 1922-11-21
Anticipated expiration: 1939-11-21

Description

W. W. STEVENSON AND 0. H. BATHGATE.

. COMBINATION GAS AND OIL BURNER. APPLICATION FILED SEPT. 9, 1918.

1L,4L85,991L a Patented-Nov, 21, 1922 A TTORNEY.

WELBUR W. STEVENSON AND OWEN H. BATHGATE, F V J'ILT'ZZINSBUHG PENNSYL VANIA, ASSIGNUBS TO ANTHONY COIL PANY, 0'5 LONG ISLAND CITY,

A CORPORATION OF NEW YORK.

new YORK,

CONIBINATIQN GAS AND OIL BURNER.

Application filed September To all whom-it may concern I Be it known that we, WiLnUn W. STEVEN- so and Owen H. Ba'rnox'rn, citizens of the United States, residing at \l'ilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Combination Gas and Oil Burners, of which the following is a specification.

This invention relates to improvements in fuel burners and more especially to burners of the externally mixing low pressure air type of the class which are equipped with means to enable the burner to use either liquid fuel or gas should such exigency arise. and it is the particular object to provide a burner of this class with such attachments as to enable the burner to perform its functions at extremely low gas pressure and is an improvement over the device disclosed in our application Serial No. 226,871 filed April th, 1918.

Other objects of our invention will appear in the following specification in which a preferred form of our fuel burner is described.

The invention is illustrated by the aid of the accompanying drawing in which Fig. 1 is a vertical longitudinal sectional view of the burner;

Fig. 2 is a transverse cross-sectional view taken along the plane line. in 1; 4

Fig. 3 is an elevation of the gas nozzle proper and Fig. at a plan view of this nozzle.

Like characters of reference denote similar parts throughout the several views and the following specification.

10 is a cylindrical casing of substantially l. shape; its shorter branch 11 is threaded interiorly to receive an air supply pipe 12. T he terminal of the longer branch 13 of cas ing 10 is threaded exteriorly at 14-. it tubular chamber 15, formed by a wall 16 extends through the casing 10 in axial alignment with its longer branch 13. TVaii 16 connects the chamber with the outer wall of casing 10 opposite its shorter branch 11 and is threaded interiorly for connection with a gas supply pipe 17.

U; sing 10 is bored out adjacent to branch 11, to receive what will be called hereafter an oil-spindle 18. This oil-spindle is of hollow cons 'truction being provided with a 9, 1918. Serial No. 253,306.

central duct 19, and extends through the tubular chamber 15 in central alignment therewith. 20 is an enlarged upper end of spindle. l8 threaded internally to receive a sprayplug 2i of the usual design employed with the low pressure air. externally atomizing, oil burner. 22 is a nozzle screwed onto the exterior of the wall 16 of chamber 15. The interior of this nozzle 22. hereafter referred to as gas nozzle," is shaped convergingly toward the outlet end of the burner. and terminates in a tubular opening 23 in axial alignment with the spray plug 21. The outer surface of the gas nozzle 2; is provided with spirally arranged vanes Ql which follow in outline the contour of the interior of the gas nozzle. 25 is a -ap adapted to screw onto the threaded end ll of branch 13 of casing 10 which cap is so shaped interiorl v as to form an annular passageway 26 between the outer surface of the gas nozzle and the interior of the cap. which passage 'ay is gradually decreasing in diameters toward the outlet end of the burner. its terminal 27 being straight and parallel with the interior opening 23 of the gas nozzle 22. lhe exterior of cap as is provided with lugs 25 to facilitate screwing the same onto the threaded part ll.

29 is a reduced portion of oil burner spindle l8, projecting outside of the casing 10 and is threaded exter-iorly to receive a needle valve 30 of standard construction; a spindle 31 of which controls a. port'32 through which oil is admitted into duct 19 of spindle l3, supplied through a pipe 33.

The operation of the device is as follows:

Uil is admitted, as is usual with oil burners J: 1. ,L i i or LlllS class, through supply pipe 53 and needle valve 30, whence it passes through spray plug 21 out at the front end of the 'lourner, where it mixes with air low pressure, forced into the casing 10 through pipe 12, which pipe is of relatively large diameter necessary to supply sutiicient oxygen for perfeet combustion. This air is deflected by means of cap 25 and more particularly through passage :26 toward the spray of oil issuing from spray plug 21 and annular outlet 23 of nozzle Should it be desired to change the fuel' 17 into the chamber 15 whence it issues through the interior of the gas nozzle 22 out at the front end of the burner.

Air passing through the cap 25 by means of the spiral vanes 24 is given a circular motion, around the gas opening adjacent the burner outlet 23, resulting in a quicker and better mixture of gas. Furthermore, the air, under pressure, issuing from the annular outlet of cap 25 in a rotary whirl, causes a partial vacuum to be created within the center of its current with a subsequential sucking effect on the gas, drawing it from the burner in place of producing a back pressure, as is the common difiiculty experienced with gas burners:

Actual tests have shown that burners of our construction may be operated with gas at the pressure of only the fraction of an ounce above atmospheric pressure, making this device particularly adaptable in districts where natural gas at a very low pressure is prevalent.

It is understood that while we have above described our invention as applied to one kind of burner of the low pressure. type, its use and application may be varied, and serve other kinds of burners as well.

Various changes in the form, proportion and minor details of construction may be resorted to without departing from the principle or sacrificing any of the invention as defined in the appended claims.

\Ve claim:

1. In a fuel burner, a liquid fuelduct within the burner, a spray plug at the outlet end of the said fuel duct, a gas chamber surrounding the said duct, means to discharge either liquid fuel or gas at the outlet end of the burner, an'air supply connection to the burner. an adjustable annular air passage at the outlet end of the burner, the said passage being so shaped and located as to create a. partial vacuum directly beyond the gas chamber while air is being forced through the said air passage, the outlets of the said air passage and the said gas cha1nber being located atsome distance beyond.

the said spray plug.

2. In a low pressure burner of the class described in which either gas or liquid fuel may be discharged at the outlet end of the burner, a fuel duct within the burner, a spray plug at the outlet end of the said fuel duct, means to deflect air against, respectively, the spray of liquid fuel or jet of gas,

the said means comprising an adjustable annular discharge nozzle provided with a number of spirally arranged vanes, the said nozzle being of substantially converging shape and located so that said air is deflected into said spray of liquid fuel or said jet of gas externally of the burner outlet, the outlet end of the said discharge nozzle being located at some distance beyond the said spray plug.

ln a combination gas and oil burner of the character described, 'an oil duct within the burner, a spray plug at the outlet end of the said oil duct, an interiorly smooth gas nozzle converging toward the outlet end of the burner and an adjustable annular air nozzle surrounding the said gas nozzle forming an air passage, the area of which is gradually decreasing toward the outlet end of the burner, the respective outlets of the gas and air nozzles lying adjacent to each other and at some distance beyond the said spray plug.

4. In a combination gas and oil burner of the nature described, an oil duct within the burner, a spray plug at the outlet endof the said oil duct, and interiorly smooth gas nozzle converging toward the outlet end of the burner and an adjustable tubular shell surrounding the said gas nozzle forming an annular air passage, the area of which is gradually decreasing toward the outlet end of the burner, spirally' arranged vanes.

within the said annular air passage whereby the air is given a rotary direction while passing therethrough, the respective outlets of the gas and air nozzles lying adjacent to each other and at some distance beyond the said spray plug.

5. In a combination gas and oil burner, a liquid fuel duct within the burner, a spray plug at the outlet end of the said duct, a gas nozzle converging toward the outlet end, an adjustable tubular shell surrounding said gas nozzle forming an annular air passage BATHGATE