US3154131A

US3154131A - Liquid fuel burning apparatus

Info

Publication number: US3154131A
Authority: US
Inventors: Leach Harold William; Wilkes David George Ernest
Original assignee: Lucas Industries Ltd
Current assignee: ZF International UK Ltd
Priority date: 1962-04-02
Filing date: 1962-04-02
Publication date: 1964-10-27
Anticipated expiration: 1981-10-27

Description

Oct. 27, 1964 w, LEACH T 3,154,131

LIQUID FUEL BURNING APPARATUS Filed April 2, 1962 2 Sheets-Sheet l Oct. 27, 1964 H. w. LEACH ETAL LIQUID FUEL BURNING APPARATUS 2 Sheets-Sheet 2 Filed April 2, 1962 m m m 2 \I a w E Um Q o AAA/ f) 4/5 :Elrzt United States Patent 3,154,131 LIQUID FUEL BURNING APPARATUS Harold William Leach, Solihull, and David George Ernest Wilkes, Castle Bromwich, near Birmingham, England,

assignors to Joseph Lucas (Industries) Limited, Birmingham, England Filed Apr. 2, 1962, Ser. No. 184,191 4 Claims. (Cl. 158-15) This invention relates to liquid fuel burning apparatus of the kind comprising a cylindrical casing adapted at its inner end for attachment to a furnace, steam generating plant, or the like, an air chest surrounding the casing and having an outer wall which is spaced from the outer end of the casing to define an air inlet therebetween, a burner tube extending through said outer wall, said burner tube being movable axially between operative and inoperative positions, and means for controlling the admission of air through said inlet.

The object of the present invention is to provide such apparatus in a convenient form.

According to the invention the means for controlling the admission of air through said inlet comprises in combination an annular disc surrounding and movable axially on a relatively fixed tube through which the burner tube extends, an annular ring closely surrounding the periphery of the disc and permitted limited axial movement relative thereto, said ring being adapted to seat against the outer end of the casing, and means for moving the ring in an axial direction between the casing and the outer wall of the air chest, the arrangement being such that the initial movement of the ring away from its seating on the casing can be effected without imparting movement to the disc.

In the accompanying drawings FIGURE 1 is an end view illustrating one example of the invention, while FIGURES 2 and 3 respectively are sections on the lines 22, 33 in FIGURE 1.

Referring to the drawings there is provided a cylindrical casing 4 which at its inner end is connected to an inlet 5 in the front wall of a furnace, steam generating plant, or the like. The outer end of the casing 4 is splayed to extend at right angles to the axis of the casing. Moreover, surrounding the casing is an air chest having an outer wall which is spaced from the outer end of the casing to define therebetween an air inlet 6.

The air chest (only part of which is shown) may be common to a plurality of apparatus in accordance with the invention, in which case it surrounds a plurality of casings, but preferably the part of the outer wall of the air chest opposite the, or each, casing, is formed as shown as a separate detachable plate 7. In this plate 7 is secured a tube 8 which is axially aligned with the casing 4, whilst through the fixed tube extends a burner tube 9 carrying a swirler 10 surrounding the burner nozzle 11. The burner tube 9 can be moved axially between an operative position, shown in full lines in FIGURE 2, in which the swirler 10 and nozzle 11 are located within the inlet 5, and an inoperative position shown in broken lines in FIGURE 2 in which the swirler 10 and nozzle 11 are located within the outer end of the casing 4. Furthermore, the outer end of the burner tube 9 at the outer side of the plate 7 is connected to a fuel supply pipe 12 by means which will permit of its disconnection only when the burner is in the inoperative position.

Surrounding the tube 8 is an axially movable and annular valve disc 13 carrying rollers 14 adapted to ride on the periphery of the tube 8. The disc 13 is closely surrounded by a short cylindrical ring 15 having an internal flange 16 at its outer end adapted to engage the disc 13. The ring 15 is permitted limited axial movement rela- "ice tive to the disc 13 Whilst still surrounding the latter, and is movable axially between a position shown in full lines in FIGURE 2 (hereinafter termed the closed position) in which it bears against the outer end of the casing 4, and a fully open position (shown in broken lines in FIG- URE 2) in which it bears against the inner side of the which limit the relative movement between the ring 15' and disc 13 in one direction. The arrangement is such that when the ring 15 is in the closed position, the disc 13 is spaced from the abutrnents 20 and is urged against an abutment collar 21 on the fixed tube by pressure in the air chest. Thus the initial movement of the spindles 17 in a direction to move the ring 15 to the open position will not impart movement to the disc 13, but will merely open an annular gap between the ring 15 and the outer end of the casing 4 to break the initial air seal. This feature enables the ready opening of the air inlet even when the difference in pressure between the air chest and the combustion chamber is considerable.

The outer end of each spindle 17 is provided with a handle 22 which is offset relative to the axis of the spindle so that the combustion space can be viewed through a transparent or translucent Window 23 at the outer end of the spindle 17. Moreover, the window 23 of one or both spindles 17 is detachable to admit the insertion of an ignition torch through the spindle, a pair of pins (not shown) being provided in the handle 22 to actuate a valve and an electric circuit of the torch respectively.

The bushes 18 in the plate 7 are externally screwthreaded at the outer side of the plate 7, and engaged therewith are screw-threaded collars 24 whereby the spindles 17 can be clamped at any desired axial setting.

In addition to the windows on the spindles 17, a further window 25 may be provided in the plate. This window is aligned with an aperture in the disc 13 which is normally closed by a pivoted shutter 26. The shutter 26, however, can be opened by manually operated means, or, as shown, automatically by a projection 27 on the plate 7 when the ring 15 is moved to the fully open position so as to provide an unobstructed view of the furnace or like chamber.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is:

1. Liquid fuel burning apparatus for connection to a combustion chamber, comprising a cylindrical casing, an air chest surrounding said casing and having an outer wall spaced from the outer end of the casing to define an air inlet therebetween, a fixed tube secured to said outer wall and extending to a position adjacent said outer end of the casing, a burner tube slidably mounted in said fixed tube and extending therefrom axially through the casing, means for moving the burner tube axially within the fixed tube between an operative position and an inoperative position, an annular disc surrounding said fixed tube and axially slidable on the exterior thereof, a spindle, means mounting said spindle on said outer wall for sliding movement in a direction parallel to said fixed tube, the inner end of said spindle extending through a hole in the annular disc, an abutment at the inner end of the spindle, said abutment engaging the disc when the abutment is moved towards the outer wall so as to move the disc towards the outer wall, an annular ring closely surrounding the periphery of the disc, means securing said ring to the spindle, an inwardly directed flange at the edge of the ring engageable with said disc to move the disc towards the casing when the ring is moved towards the casing by means of the spindle, movement of said spindle towards the casing being halted by said ring engaging the casing and forming with the disc an air-tight seal between the interior of the casing and the air chest, and a stop on the fixed tube limiting movement of the disc towards the casing to a position in which the disc is spaced from said abutment, whereby movement of the spindle away from the casing serves to move the ring to break said air seal before the disc is moved.

2. Liquid fuel burning apparatus as claimed in claim 1 in which said spindle is hollow, the end of the spindle remote from the casing being provided with a handle which is offset relative to the axis of the spindle whereby the casing can be viewed through the spindle.

3. Liquid fuel burning apparatus as claimed in claim 1 including means for'clarnping the spindle at any desired axial setting.

4. Liquid fuel burning apparatus as claimed in claim 1 including an aperture in said disc, a pivotal shutter closing said aperture, a window in said outer Wall in alignment with the aperture, and a projection on said outer 5 wall engageable with the shutter to open the aperture when the disc is moved towards said outer wall.

References Cited in the file of this patent UNITED STATES PATENTS 1,132,808 Tuttle Mar. 23, 1915 1,349,562 Curry Aug. 17, 1920 1,844,315 Forney Feb. 9, 1932 2,464,698 Logan Mar. 15, 1949 15 2,757,721 Reed et al Aug. 7, 1956 3,067,808 Poole Dec. 11, 1962 FOREIGN PATENTS 455,411 Germany Jan. 31, 1928