US2870830A

US2870830A - Gas burners

Info

Publication number: US2870830A
Application number: US465411A
Authority: US
Inventors: Treu Rheinisch-Westfa Revision; Franken Wilhelm
Original assignee: American Infra Red Radiant Co Inc
Current assignee: American Infra Red Radiant Co Inc
Priority date: 1954-10-28
Filing date: 1954-10-28
Publication date: 1959-01-27
Anticipated expiration: 1976-01-27

Description

Jan. 27, 1959 G. scHwANK @As BURNERS Filed oet. ze, 1954 United States Parent 2,870,330` GAS BURNERS The present invention relates to gas burners of the type comprising a mixing chamber wherein a gaseous fuel and primary air aremixed prior to issuing from the mixing chamber through a burner element on the surface of which incandescent combustion takes place. More particularly, the invention relates to meansfor guiding andwdistributing the mixture of gas `and air inside the mixing chamber, wherein there is provided a one-piece mixing or injector tube for supplying and constituting the gaseous mixture, and wherein air is sucked into the chamber by injector effect in response to the flow of gas from a gas jet `coupled to a supply source having a conventional low gas pressure of approximately to 100 millimeters of water.

One object of the present invention is to guide and distribute the mixture of gas and air passing into the mixing chamber through the one-piece mixing tube in such a manner that a uniform combustible mixture is supplied to all parts of the burner element and is uni-yl formly distributed over the whole surface thereof.

According to the present invention, there Tarceproyideh` in a same component part of "the gas buriieigta first support surface for the gas jet coupling member andV a second support surface for the one-piece mixing tube, the rst support surface being-machined simultaneously either with the internal bore of the mixing tube or with a threaded bore constituting the second support surface, whereby either the internal surface of the mixing tubeor that of the second support surface constituted by the threaded bore is coaxially aligned with the first support surface for the gas jet coupling member. j

By proceedingin accordance with the invention, it is possible to obtain accurate mutual alignment of the gas jet and of the mixing tube, with exact coincidence of the axes thereof. Such an arrangement is a prerequisite for uniform constitution of the mixture inside of themixing tube and in the `mixing chamber. If the gas jet and mixingtube are not accurately centered and aligned, it

is impossible to obtain a uniform mixture, so `that there will be incomplete combustion at individual portions of the burner surface due to insufficient supply of air, there-` by causing the escape of unburned gases, whereas at other portions of the burner surface there` will be irregular combustion due toexcessive air.

, According to a further feature of -the invention, the combustion air enters the suction chamberof the injector through a single opening, whereby it is possible `tojmount a iilter in this opening and to connect an air` supply duct thereto. The opening is large enough to prevent any disturbance in the flow of gas and air.

In order to distribute thegas and `air mixture issuing from the mixing tube uniformly and free of turbulence, and also to provide additional mixing thereof, the inside of the mixing chamber facing the outlet of themixing tube is shaped to define a` deflection and distribution surfacewhich reverses the direction of flow of the` mixture without turbulence, so that the mixture reaches the burner surface in the opposite direction to the flow inthe mixing tube. i

ice

Inside of the mixing and distributing chamber through which the gases flow, there are arranged a` plurality of distributing surfaces parallel to the burner surface, which have a still further effect upon the gas and air mixture for the purpose of insuring a quiet and uniform flow free of all turbulence. j t

According to a further feature of the invention, and in order to facilitate the manufacture, the Vmixing tube may be formed integrally with the mixing chamber instead of being a separate one-piece tube supported therein by screw connection. j l j The invention will be more readily understood with reference to the accompanying drawing wherein Figure l is a longitudinal section through the `line I`I of Figure 2 in a plane perpendicular to the burner surface.

h Figure 2 is a plan view looking at the top of Figure 1.

The gaseous fuel is supplied through opening 1 in a jet coupling member 2, and issues through the jet body 3 and nozzle 4 `into the suction chamber 5. The ow of gas can be controlled by adjustment of the needle valve` 6 positionedinside the jet. By reason of the reduced pressure in the chamber 5 caused by the iiow of gas outof the nozzle 4 in the direction toward the mixing tube 8, air is sucked into the chamber .5 through the opening 7. The mixing tube.8, which is of one-piece construction, is supported in a threaded bore 9 of the burner housing 11. AThe body 2 of the jet coupling member supporting the nozzle 4 is supported` in a cylindrical bore'10 of the same burner body 11. As clearly shown by the drawings, the housing 11 is a substantially dishshaped main body member of generally rectangular form,

havingan imperforate bottom wall 11a, imperforate side walls 11b and opposite end walls 11e and 11d. The end wall 11al is provided with a threaded bore or opening formed centrally thereof. The dish-shaped` body member 11 isV provided with an opening between the opposite ends thereof defnedby a ledge 11e on which the flat fuel-outlet burner element 14a is supported. The threaded `bore 9 and cylindrical bore 10 of the burner body 11 can be machined therein simultaneously in order to obtain exact centering and alignment thereof. It is also possible to machine the thread of the bore 9 separately and to mount the mixing tube 8 therein, and thereafter to machine the internal surface of the mixingV tube 8 and the cylindrical bore 10 simultaneously.

The lopening 7 of the suction chamber 5 may be preceded `by an air filter with an air supply duct connected thereto. In view of the asymmetrical unilateral air supply through the opening 7, such opening must be relatively large in order that the speed of the air passing therethrough may be so low as` to have no disturbing or deflecting effect on the stream of gas issuing through the nozzle 4.

mixing chamber inside the burner body 11 on end wall 11d, the shape of the surface 12 being such that the gaseous mixture enters the mixing and distributing chamber 13 in a uniform flow in a direction opposite to the direction of flow in the mixing tube 8. Consequently, the mixture isuniformly distributed inside the mixing and distributing chamber 13. The non-turbulent and uniform flow of mixture to the burner surface 14 is still further enhanced by distributing surfaces or bafes 15 and 16 extending parallel to the burner surface 14 inside the mixing and distributing chamber 13 at the ends thereof. A` portion of the subject matter herein is disclosed in co-pending application Serial No. 2l4,468,.n0w

Patent 2,775,294.

What is claimed is:

1. In a gas burner, a dish-shaped body member having opposite side walls, opposite end walls and a bottom wall defining a mixing chamber in which gase-ous fuel and air are mixed prior to combustion, a mixing tube disposed in said mixing chamber and having `an inlet adjacent one of said end walls, said mixing tube extending toward the opposite end wall and having an outlet in communciation with said chamber at a point remote from said one end Wall and nearer to said opposite end Wall than to said one end wall, said side walls confronting the opposite sides, respectively, of said mixing tube, 'and defining the maximum width of said dish-shaped body, each side wall being spaced a substantial distance from the confronting side, respectively, of the mixing tube, a nozzle in fluid `communication with said mixing tube for supplying fuel to the latter, air inlet means in uid communication with said mixing tube and nozzle for supplying air to said mixing tube responsive to the ow of fuel from said nozzle into said tube, said dishshaped body having a flat planar opening substantially coextensive in area with said dish-shaped body between said opposite side walls and said opposite end walls thereof, and dat fuel-outlet burner means mounted on said body adjacent said mixing tube and covering said opening, said dat fuel-outlet burner means having its opposite surfaces of maximum area disposed parallel to said planar opening of the `dish-shaped 'body member, the depth of said dish-shaped body between said bottom wall and said flat fuel-outlet burner means being not substantially greater than the diameter of said mixing tube.

2. In a gas burner, a dish-shaped body member having opposite side Walls, opposite end walls and a bottom wall defining a mixing chamber in which gaseous fuel and air are mixed prior to combustion, a mixing tube Vdisposed in said mixing chamber and having an inlet adjacent one of said end walls, said mixing tube extending toward the opposite end wall and having an outlet in communication with said chamber, said side walls confronting the opposite sides, respectively, of said mixing tube, and defining the maximum width of said dish-shaped body, each side wall being spaced a substantial distance from the confronting side, respectively, of the mixing tube, a nozzle in fluid communication with said mixing tube for supplying fuel to the latter, air inlet means in uid communication with said mixing tube and nozzle for supplying air to said mixing tube responsive to the ow of fuel from said nozzle into said tube, said dishshaped body having a fiat planar opening substantially coextensive in area with said dish-shaped body between said opposite side walls and said opposite end walls thereof, and at fuel-outlet burner means mounted on said body adjacent said mixing tube and covering said opening, said fiat fuel-outlet burner means having its opposite surfaces of maximum area disposed parallel to said planar opening of the dish-shaped body member, the depth of said dish-shaped body between said bottom wall and said flat fuel-outlet 'burner means being not substantially greater than the diameter of said mixing tube, said dish-shaped body member having lan internal part extending between said side walls adjacent the said opposite end wall and provided with surface portions disposed transversely of `the longitudinal axis of said mixing tube and confronting said outlet opening of said mixing tube for directing the fuel and air issuing from said outlet opening in a direction of 4liow externally of said mixing tube extending from said surface portions toward the said one end wall of said dish-shaped body.

3. In a gas burner, a dish-shaped body member having opposite side walls, opposite end walls and a bottom wall defining a mixing chamber in which gaseous fuel and air are mixedprior to combustion, a mixing tube disposed in said mixing chamber'and having an inlet adjacent one of said end walls and anv outlet in fluid communication with said chamber adjacent the opposite end wall thereof, said said dish-shaped body, each side wall being spaced from the confronting side, respectively, of the mixing tube, a distance not substantially less than the radius of said mixing tube, a nozzle in fluid communication with said mixing tube for supplying fuel to the latter, air inlet means in iuid communication with said mixing tube and nozzle for supplying air to said mixing tube responsive to the flow of fuel from said nozzle into said tube, said dish-shaped body having a at planar opening substantially coextensive in area with said dish-shaped `body between said opposite side walls and said opposite end Walls thereof, and flat fuel-outlet burner means mounted on said body adjacent said mixing tube and covering said opening, said flat fueloutlet burner means having its opposite surfaces of maximum area disposed parallel to said planar opening of the dish-shaped body member, said outlet opening and said burner means being substantially coextensive and being disposed adjacent one side of said mixing tube, the depth of said dish-shaped body member between said bottom wall and said flat fuel-outlet burner means being not substantially greater than the diameter of said mixing tube.

4. In a -gas burner, a dish-shaped Vbody member having opposite side walls, opposite end walls and a bottom wall defining a mixing chamber in which gaseous fuel and air are mixed prior to combustion, a mixing tube disposed in said mixing chamber and having an inlet adjacent one of said end walls and an outlet in iiuid communication with said chamber adjacent the opposite end wall thereof, said side walls confronting the opposite sides, respectively, of said mixing tube and said mixing tube being positioned substantially midway between said side walls laterally thereof, said side walls defining the maximum width of said dish-shaped body, each side wall being spaced from the confronting side, respectively, of the mixing tube, a distance not substantially less than the radius of said mixing tube, a nozzle in fluid communication with said mixing tube for supplying fuel to the latter, air inlet means in lluid communication with said mixing tube and nozzle for supplying air to said mixing tube responsive to the ow of fuel from said nozzle into said tube, said dishshaped body having a flat planar opening substantially coextensive in area with said dish-shaped body between said opposite side walls and said opposite end walls thereof, and at fuel-outlet burner means mounted on said body adjacent said mixing tube and covering said opening, said liat fuel-outlet burner means having its opposite surf-aces of maximum area disposed parallel to said planar opening of the dish-shaped body member, said outlet opening and said burner means being substantially coextensive and being disposed adjacent one side of said mixing tube, the depth of said dish-shaped body member between said bottom wall and said at fuel-outlet burner means being not substantially -greater than the diameter of said mixing tube, said dish-shaped body member having an internal part extending between said side walls adjacent the said opposite end wall and provided with surface portions disposed transversely of the longitudinal axis of said mixing tube and confronting said outlet opening of said mixing tube, for directing the fuel and air issuing from said outlet opening in a direction of flow externally of said mixing tube extending from said surface portion toward the said one end wall of said dish-shaped body.

References Cited in the iile of this patent UNITED STATES PATENTS 1,170,509 Burnham Feb. 8, 1916 1,259,029 Lucke Mar. 12, 1918 1,365,816 Colmar Jan. 18,1921 1,451,072 Hoffstetter Apr. y10, 1923 (Other references on following page) 5 UNITED STATES PATENTS Vaughn July 17, 1928 Hellman July 4, 1933 Golden Dec. 5, 1950 Kennedy Dec. 11, 1951 6 FOREIGN PATENTS Australia May 17, 1953 France Apr. 23, 1934 France Apr. 21, 1954