US618501A - Samuel fraser - Google Patents

Description

Patented lan; 3|, |899.-

S. FRASER.

STEAM BILER.

(Application led Apr. 8, 1898.;

(No Model.)

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SAMUEL FRASER, OF TORONTO, CANADA.

STEAM-BOILER.

SPECIFICATION formingpart of Letters Patent No. 618,501, dated January 31, 1899.

d Application filed April 8, 1898- Serial No. 676,923. (No model.)

To all whom it may concern:

Be it known that I, SAMUEL FRASER, of the city of Toronto, in the county of York, in the Province of Ontario, Canada, have invented certain new and useful Improvements in Steam-Boilers, of whichthe following is a specification.

My invention relates to improvements in steam-boilers and steam-boiler furnaces; and the object of the invention is to improve the construction of the boiler and furnace, whereby a maximum amount of heating-surface may be provided, and consequently the steam generated more quickly,a rapid more complete circulation of water and consequent economy in fuel, and at the same time prevent the radiation of the heat from the walls of the furnace; and it consists, essentially, of a boiler having a furnace the sides or walls of which are made of suitable metal tubes placed one above the other, the front of the tubes being connected to the boiler just below the waterline and near the center line of the boiler and the back of the tubes being connected to the boiler near the bottom thereof, where the water is colder, the pipes and connections to the boiler being otherwise arranged and constructed in detail as hereinafter more particularly explained.

Figure l is an elevation of a boiler constructed in-accordance with my invention. Fig. 2 is a side elevation of Fig. l, partially in section.

In the drawings like letters of reference indicate corresponding parts in-each iigure.

In the drawings I have shown one-half of a double boiler, plus the central tubular partition.

A is the boiler proper,consisting of the usual flue-tubes a.

B is the furnace, which is provided with the usual front door b, front b, bridge b2, and back b3, all lined with the usual lire-brick lining. n

o4 are the sides, which are provided with a lining b5 of asbestos or fire-clay to prevent radiation and to protect the outside plate from the intense heat of the furnace.

O are a series of tubes located on each side and forming, substantially, the wall of the furnace.

distance apart, one above the other. These The tubes C are located at a slight tubes are so spaced that there will be a clear space between them and the heat or iiames will entirely surround the tubes. The front plate b and bridge-plate b2 I provide with suitable holes for the pipes to pass through. The ends of the tubes project through the plates b and b2, whereby the connections are not exposed to the intense heat of the fire.

Although in the drawings I only show the tubes extending j ust through the bridge-wall,

it will be understood that they may be carried to the full length of the boiler should it be deemed necessary.

The tubes are connected at the front end by the pipe-joints c to the stand-pipe D, which is closed at the bottom and is connected at the top to the boiler below the water-line, near the center line of the boiler. It will be noticed vthat the joints c are connected to the tubes O near the upper portion of the ends. The joints c' at the opposite end, however, are connected to the ends of the tubes G near the lower portion of the ends and are suitably connected to or form part of the stand-pipe E, which is connected by the pipe F to the branch pipe F', which extends into thebottom of the boiler.

vThe advantage of the connection of the joints c and c to the tubes O as described is that the circulation is facilitated. The stand-pipe D is connected, as hereinbefore described, to the center of the boiler, just below the waterline, in order to introduce the steam from the tubes O most advantageously into the boiler, and the pipe F is connected to the lower portion of the boiler, where the water is colder than at or near the steam-line, thereby creating a free circulation of the water. I also provide a drain-pipe Gr for the tubes. This construction can be adapted to any multitubular boiler and increases the capacity of such p boiler` to a great extent.

The advantages of this class of boiler over ordinary boilers are numerous. There are no walls to absorb the heat and afterward throw it off into the boiler-room, but the heat is taken up by the tubes, which, being exposed IOO The advantages of this type over the locomotive type of boiler are great. There are no flat surfaces. The tubes, being cylindrical, take up the particles of heat more rapidly than vertical flat surfaces in the proportion of about tWo to one. Again, in the same height of {ire-box there is a greater amount of surface exposed to heat-in fact, nearly three times more, as the tubes are surrounded by heat. Again-Water-legs of the locomotive type of boiler frequently get choked up with mud and becomea source of danger. Besides, the first cost of these boilers is enormous in comparison with the plain cylindrical type.

The boiler is simple and cheap and of great strength, and there is excellent circulation and equal expansion and contraction and a greater heating-surface than any boiler at present in use of which I am aware.

What I claim as my invention is- In a steam-boiler, the combination with the main boiler proper and furnace-chamber, of

the horizontal side tubes forming the side Walls of the tire-box, the stand-pipes at each end of the tubes connected by suitable branches to the ends of the tubes, the standpipe at the back of the boiler being located in the furnace-chamber and the branches thereof connected to the side tubes at the lower portion of the ends of the tube and the stand-pipe at the front end of the boiler entirely outside the Wall and connected to this end of the side tubes at the upper portion of the ends, a suitable inlet-pipe connected to the rear end of the boiler near the bottom thereof and to the stand-pipe and a suitable branch or extension of the outer front stand-pipe extending into the boiler immediately below the Water-line thereof, substantially as described.

SAMUEL FRASER.

l/Vitnesses:

B. BOYD, p A. H. MCADAM.

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