US1789772A

US1789772A - Flame shield

Info

Publication number: US1789772A
Application number: US364270A
Authority: US
Inventors: John A Phelan
Original assignee: ELBERT B KNOWLES
Current assignee: ELBERT B KNOWLES
Priority date: 1929-05-18
Filing date: 1929-05-18
Publication date: 1931-01-20
Anticipated expiration: 1948-01-20

Description

Jan. 20, 1931.

J. A. PHELAN FLAME SH I ELD Filed May 18, 1929 Jam #9 1 /1222 Patented Jan, 20, 1931 UNITED STATES PATENT O IC T f Y I JOHN A. PHELAN, or eALvEs'roN, TEXAS, nssrenon to smear B..-K1\rowLEs, or"

ennvrsmon, TEXAS I I FLAME si-irnnn Application f led May 18, 1929l' seria1 u'o."ae4,a7o.

The present invention relates to improvements in flame shields, and more particularly to flame shields for use in connection with oil or gas burning apparatus.

An object of the invention is to provide an improved shield of light weight, low cost, durable construction and long life designed for use in connection with oilor gas burners and acting to protect the burner.

Another object of the invention is to provide an improved flame shield, which will be adjustable on the guide burner pipe for the purpose of increasing or decreasing the flame volume and temperature.

A further object of the invention is to provide an improved flame shield that will improve the combustion, render the operation of the burner substantially noiseless and produce a wide, whirling, soft flame, short in 20 length and with intense heat of combustive ases. i r b A still further object of the invention is to provide an improved flame shield in which the amount of soot usually found in boiler tube areas is reduced to the minimum.

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer to like or corresponding parts throughout the several views,

Figure 1 is a front view,with parts broken proved flame shield constructed in accordance with the present invention,

Figure 2 is an edge view of the same with parts of the burner and guide pipe indicated in dotted lines,

Figure 3 is a central sectional view taken through the device with parts of the burner and guide pipe indicated in dotted lines, and

Figure 1 is a front elevation showing a slight modification.

Referring more particularly to the drawings, 5 represents a sleeve or hub on one end of which is a small shield disc 6 and spaced rearwardly, with reference to the burner, is a 559 second shield disc 7 of larger diameter.

away, and parts shown in section, of an im-- Preferably both discs are dished with=their concave sides facing-the burner which is in d1catedat 8. -A1r open1ngs9 are made in the large disc 7 adjacent the hub 5 andsuch openingscommunicate-with the space between the

discs

6 and 7. This space is oc-' cupied by vanes 10, whichas shown in Figure 1, are preferably curved to imparta whirling motionto the incomingair. The vanes preferably "are of the same depth as the inner disc 6 and they are open at their upper ends. The hub 5 extends outwardly beyond the large disc 7 and is provided with "perforatedlugs 11 to receive the adjusting rods 12. r

The hub 5 is mounted upon the burnerpipe- 18, which acts as a guide pipe. 7 p In the use of the device, the airenters from the outer surface or convex side of the large shield disc 7, passing through the openings'9 and into the space between the curved vanes 10 and thence outwardly alon" the curved side walls of the vanes 10 an against the. inner concave surface of the disc 7 which extends outwardly beyond the endsof the vanes 10 and the edge of the smaller disc 6. The vanes 10 may beset at an angle of seventy degrees which has been found to give good results. v,

' The incoming air mixes with-the fuel at a point comparatively close to the atomizer 8 where ignition takes place, combustion being supported and completed by the air passing around the "outside ofthe shield.

Consequently there is produced in the fire box a wide, whirling, soft flame, substantially noiseless, short in length, and with intense heat of combustive gases. The flame may be increased or decreased by moving the shield unit inward or outward at the discretion of the operator, who hasthe adjustment under easy control through the use of the rods12. I'fno adjustment is required, the unitmay be firmly fixedto the guide pipe 13, as by the use of the set screw 14, shown in'Figure 2.

By the use of the improved flame shield, the

percentage of soot usually found in boiler tube areas, where othertypes ofshi e lds'have beenemployed,is reduced to a minimum and this indicates that a. substantially'complete combustion-has-been effected.

7 As shown in Figure l the inclined diagonal slots 15 are made in the front shield disc 6 where the device is used with gas. It will be noted that the slots 15 are preferably located between adjacent vanes 10. These slots will permit a certain restricted proportion of the air to be drawn directly to the burner through the front disc. Such air will be in narrow sheets presented edgewise and at an inclination to the burner.

The arrangement of the device is such as to allow a complete mixture of air at substantially right angles to the oil spray inthe hollow cone shape from the burner atomizer.

The devices may be manufactured in difier entsizes to suit various conditions ofuse and they are intended to overcome well known objectionable features encountered in pres ent forms of flame cones or shields such for instance as the items of noise, expense, proper and complete combustion.

It is obvious that various changes and modifications may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claims.

What is claimed is 1. An improved .fiame shield comprising a small disc, a large disc spaced axially from thesmall disc and havingopenings therein communicating with the atmosphere and with thespace between the discs, and transverse vanes extending between the axially spaced discs and across said space between the discs.

2. An improved flameshield comprising, in combination with a burner and a burner pipe, a hub slidably mounted on said burner pipe, means to adjust said hub on the burner pipe toward and from the burner, a small disc of concavo-convex form on the inner end of said hub, a second disc of concavo-convex form onzthe hub spaced from the first mentioned disc and being of greater diameter than said first named disc and having air receiving openings adjoining the hub, and transversely extending curved vanes spaced apart andextending between said discs and being openat their outer ends.

3. An improved flame shield comprising a hub, discs ofunequal diameters spaced along the axis of the hub, and vanes between said discs having spaces therebetween and between the discs opening radially outward and in communication with a source of air supply.

4. In combination a burner having a combustion spaceand an improved flame shield comprising a pair of dished discs axially spacedapart, and vanes between said discs and having spaces therebetween in communication with the atmosphere at their-inner portions and with the combustion space of said burner at their outer portions.

JOHN A. PHELAN.