US1591896A - Furnace front - Google Patents

Description

my s, w26. H. A. THOMPSN #URNACE FRONT Filed Deo. 26, 1924 2 SheetsmSheet l Patented July 6, 1926.

HERBERT ALEXANDER THQMPSON, OF lvORPETI-l, ENGLAN), ASSIGrNOR OF ONE-HALF TO SWINNEY BROTHERS LIMTED, OF M ORPETH, ENGLAND, A BRITISH COMPANY.

FR/NACE FRONT.

Application led December 26, 1924, Serial No. 758,187,

This invention relates to furnace fronts for furnaces working under natural, assisted, or closed stokehold draught and the invention has for its objectto provide an 5 improved furnace front for such furnaces of the type which are convertible for burning Veither coal or'oil or may be used for burning coal and oil simultaneously.

The improved furnace fronts are also of io the type wherein oil burners fitted with coaxial air directing cones are arranged at an angle in relation to a central Vcoal burning fire door. 1

A ,furnace front of the type referred to and made in accordance with the present invention comprises the combination with the lire opening and an air directing cone of an intermediate angular or wedge shaped filling in piece or extension from one of said parts whereby the said air directing cone is mounted upon the lire opening in xed angu lar relation thereto.-

As an eXample,-two air directing cones may be employed each provided with an outwardly extending angular or tapered boss, the outer face of which fits against the side of the fire opening and is secured thereto by bolts or studs, or other such like fastenings.

The said air directing cones are preferably provided with an oblique circumferential flange adapted to fit against the inside face of the inner plate of the furnace front so as to make an airtight joint therewith assisted if required by interposed packing material. p

A furnace front having two air directing cones, made and fitted as above mentioned, may be provided with an air chamber divided into right and left hand chambers Y by a central division plate so that each air directing cone and its oil burner are located in or fed by separate air chambers.

Dampers such as hereinafter described F may be l'itted to the chambers of the furnace front, the fire door and the ash pit cover plate which is used when firing with oil.

The accompanying drawings illustrate one construction of improve furnace front carried out in accordance with the present in- Vvention,

Fig. l is a front elevation half in section,

Fig. 2 is a sectional plan,

Fig. 3 is a central verticalsection of Fig. l, on line 3 3.

and :h1 Great Britain November 19, 1924.

Fig. at is a sectional burning front,

Fig. 5 is a separate sectional view of one of the hinged dampers.

Fig. 6 is a sectional detail showing a cover plate fitted to the oil burner air cones when the furnace is being fired with coal alone,

Figure 7 is atletail plan view of one of the directing cones.

Figure 8 is a detail plan view of the same, and

Figure 9 is a vertical section through the furnace front taken transversely of the fur` nace and showing a modification in the frame structure.

In the construction shown, a is the air director, or cone, hereinafter referred toas the air directing cone, which may be of any suitable shape, to suit the space available.

In order to ensure accuracy in the setting of these air directing cones a so that they will properly register with the axes of the oil burners b the side of each air directing cone a is made with an outwardly projecting angular or tapered boss a which is arranged to be secured to the wall or side of the fire opening d, by means of bolts or studs CZ, or other such like fastenings.

The said air directing cones a are each provided with an oblique flange e adapted detail showing a coal dead plate fitted to the furnace to fit against the inside face of the inner plate o of the furnace front.

This arrangement ensures perfect setting of the parts and enables the furnace front to be assembled all ready for fitting to the ,Inner steel plate c instead of the cones .z having to be attached to the said plate c as is usually the case.

The small oblique flange c abuts against the inner side of the plate c and maintains an air tight joint therewith. If required suitable jointng material may be inserted between the two faces.

The body of the furnace front is preferably made with the fire opening d and a v division plate g in one casting, but if desired for convenience in the manufacture, as shown in Figure 9, the casting may consist of right and left hand portions, each cast with a vertical plateA which when brought together and the parts bolted up, as at f', form one complete semicircular front with a division plate g.

The underside of the body f of the -furnace front is preferably made with a flange such as 7a, Jor the purpose ot securing the casting to the inner steel plate c and also in carrying with the same bolts or studs or the dead plate a' (Fig. el) for use when coal burning.

'Qhe necessary air for combustion in the il burners which are situated in the air directing cones i is admitted to the inside of the air chambers on the body ot' the furnace front by means oi' pivote-:l plates or dainpers y' which are so mounted that their lower edges open inwards and direct the air downwards.

ri`hese regulating da'nipers j are mounted on square bars or hinges j', the ends ot which are made circular to act as pivots or hinge pins and are received within securing lugs la tastened to the front ot the body j' by means of studs or bolts.

A small knob or handle Z is titted to the damper plate vtor the purpose ot operating the same, and thumb screws mA are also provided 'for the purpose ot adjusting and rigidly securing the damper pate either in the open, closed, or any intermediate position.

Suitable sight holes f/i are titted consisting of mica, plates or other transparent material so that the attendant may be able to observe the liaine at the burner end, these sight holes n being situated in the Jiront tace oithe casting f so that they are within the diameter or area ot the air directing cones a.

rlhe tire opening (Z is closed by means oi' any suitable type ot coal burning door, that in the drawing being of the hinge type. To this coal door however is itted a small pivoted damper j similar to that above described. Below this damper j is arranged a a small hinged door o which is provided principally as a means of access tor passing in a lighted torch when lighting up the oil burners. This door o may be iitted with mica plates or other transparent material to t'orm a sight hole.

A semi-circular plate lv is provided for the purpose of closing up the lower half of the Vfurnace opening when oil burning. This plate p has fitted to it a traine g which lornis an air opening through the plate. The said air opening is controlled by means ol' another pivoted damper such as previously described.

To the traine g are also itted lifting handles q', these handles being preferably of inild steel secured in the iframe g when casting the same.

W'henit is desired to burn coal only with the improved i'urnace front, closing plates fr are employed for covering the inner end or opening of the air cones a; these plates are o'i' similar shape to the 'air cones and they are provided with holes il to allow ot' a small circulation of air through these plates to keep the saine cool. The plate r inay be secured in position by the simple :irrangenient of bolt carried through the burner holder ZJ aiter the burner Z; has been removed.

rEhe operation of the improved furnace 'li'oiits t'or oil burning is as follows Suitably heated oil having been lcd to the burners b which are inserted through the cones u, and which burners may be ot any desired type, the air control dainpers 'i are opened to the desired extent which allow; air to pass within air chambers of the body rthese pivoted daiiipers 7' cause the air io be thrown against the plate c so that the air fthe surface of saine cool.

is caused to circulate over i. c l 1, die said plate and neep the f Y1 1 `f` v v l 1 ne air Liicn passes down within the body j* and having been raised in temperature through its circulation over the plate c is then tree to'pass through the cones a and mix with the oil spray troni the burners,

The ashpit damper plate is also opened a desired amount and this being hinged in :in inward and upward direction air to pass upwards towards the burners 5.

i lighted torch is inserted through the small door o to start combustion.

The sinal control damper j in the lire door is provided ot air to circulate within the coal tire opening d to destory any vacuuin el'lect which may arise through this opening being towards the rear ot' the burners, it having been found that where this door is lierinetically sealed there is a tendency for the flame troni the burners to be drawn back lo the lire opening and cause damage through local heating.

It has been found that the necessary small quantity ot air may be snitabl)v admitted through the damper j in the lire box.

What I clain'i as iny invention and desire to secure by Letters Patent iszl. "iurnace front ot the type referred io comprising the combination ol a tnrnacc lront toi-ined ot' an inner plate provided willi apertures and an outer casting coniprising the tiringl opening and enclosing an air heating chamber. oil burners li'icatcd one on each side 'ot the tiring opening, 'air directing cones arranged consi-all; with said oil burners and each provided with an outwardly extending angular boss and an outer oblique circumferential flange, means for attaching said angular bosses t'o the sides of the lire opening casting wherebwsaid air directing cones are mounted in lixed angular relation to the sides ot the tire opening casting and with their oblique circumferential flanges fitted against the inside face of the inner plate otl the furnace front.

A furnace iront of the type referied to comprising the combination of, a furnace 'front formed ot an inner plate provided causes tlic to allow a sinallipiantity lou fil)

Sli

with apertures for receiving the air directing cones and an outer casting comprising a firing opening and enclosing an air heating chamber divided by a central partition lcated above the firing opening, oil burners located one on each side of the firing opening air directing cones arranged coaxia-lly with said oil burners and each provided with an outwardly extending' angular boss and an outer oblique circumferential flange, means for attaching said angular bosses to the sides of the fire opening casting whereby said air directing cones are mounted in fixed angular relation to the sides of the fire opening casting and with their oblique circumferential flanges fitted against the inside face of the inner plate of the furnace front.

3. A furnace front of the type referred to comprising the combination of, a furnace front formed of an inner plate provided with apertures and an outer casting comprising a. firing opening and enclosing an air heating chamber divided by a central partition located above the firing opening, a down- \\f'ardly extending flange on the lower part of the air chamber casting and means for securing said flange to the inner plate of the furnace front and bolts for detachably securing a coal burning dead plate to the inner side of the said inner plate and to said downwardly extending flange, oil burners located one on each side of the firing opening, air directing cones arranged coaxially with said oil burners and each provided with an outwardly extendingl angular' boss and an outer oblique circumferential flange, means for attaching said angular bosses to the sides of the fire opening casting whereby said air directing cones are mounted in fixed angular relation to the sides of the fire opening casting and with their oblique circumferential fianges fitted against the inside face of the inner plate of the furnace front.

l. A furnace front of the type referred to comprising the combination of, a furnace front formed of an inner plate provided with apertures and an outer casting comprising a firing opening and enclosing an air heating' chamber divided by a central partition located above the firing opening, a downwardly extending flange on the lower part of the air chamber casting and means for securing said flange to the inner plate oi" the furnace front and bolts for detachably lsecuring coal burning dead plate to the inner side of the said inner plate and to said downwardly extending flange, oil burners located one on each side of the firing opening, air directing cones arranged coaxially with said oil burners and each provided with an outwardly extending angular boss and an outer oblique circumferential flange, means for attaching said angular bosses to the sides of the fire opening casting whereby said air directing cones are mounted in fixed angular relation to the sides of the fire opening casting and with their oblique circumferential flanges fitted against the inside face of the inner plate of the furnace front, a detachable cover plate for the ash pit opening, pivoted air admission dampers for the air chamber the lire door and the ash pit cover plate used for oil burning, consisting of plates mounted on hinged bars and provided with operating knobs and adjusting thumb screws.

A furnace front of the type referred to comprising the combination of, a furnace front formed of an inner plate providedV with apertures and an outer casting comprising a firing opening and enclosingan air heating chamber divided by acentral partition located above the firing opening, a downwardly extending flange on the lower part of the. air chamber casting and means for securing said flange to the inner plate of the furnace front and bolts for detachably securing a coal burning dead plate to the inner side of the said inner plate and to said downwardly extending flange, oil burners located one on each side of the firing opening, air directing cones arranged coaxially with said oil burners and each. provided with an outwardly extending angular boss and an outer oblique circumferential flange, means for attaching said angular bosses to the sides of the fire opening casting whereby said air directing cones are mounted in fixed angular relation to the sides of the fire opening casting and with their oblique circumferential flanges fitted against the inside face of the limer plate of the furnace front, a detachable cover plate for the ash pit opening, pivoted airl admission dampers for the air chamber the fire door and the ash pit cover plate used for oil burning, consisting of plates mounted on hinged bars and provided with operating knobs and ad]- Listing thumb sc ewsj means for securing the detachable ash pit cover plate beneath the edge'of said downwardly extending flange on the furnace front casting nd clamps mounted on said downwardly extending flange and bearing on the detachable ash pit cover plate. Y

HERBERT ALEXANDER THOMPSON.

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