US398370A - Steam-boiler - Google Patents

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US398370A US398370DA US398370A US 398370 A US398370 A US 398370A US 398370D A US398370D A US 398370DA US 398370 A US398370 A US 398370A
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    • F22B13/00Steam boilers of fire-box type, i.e. the combustion of fuel being performed in a chamber or fire-box with subsequent flue(s) or fire tube(s), both chamber or fire-box and flues or fire tubes being built-in in the boiler body
    • F22B13/06Locomobile, traction-engine, steam-roller, or locomotive boilers


(No Model.)
STEAM BOILER. No. 398,370. Patented Feb. 26, 1889.
I h MO? a miram zlfarmmff I I e22 ezyeal Z? UNITED STATES P TENT OEEIcE.
SPECIFICATION forming part of Letters Patent No. 398,370, dated February 26, 18859.
Application filed July 20, 1888. Serial No. 280,478- (No model.)
'Maine, have invented certain new and useful Improvements in Steam-Boilers; and I do hereby declare the following to be a full,
clear, and exact description of the invention,
such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.
Thisinvention relates to steam-boilers; and
its object is to improve and create a greater natural draft, whereby steam can be generated more quickly and rapidly, while a poorer quality of fuel may be employed without the aid of a blower and with good results.
To this end my invention consists in the construction and combination of devices hereinafter set forth and claimed.
' The drawings herein shown represent, in Figure 1, a front end elevation of a boiler containing my improvements, with one-half Fig. 2 is a central.
lindrieal shells-an outer and inner one, re-
spectively- 3 4*, circular in crass-section. These shells, together with the front and rear end heads, 5 6, form the water-space, which, for convenience of description, may be said to consist of an upper and lower portion, determined by a plane drawn horizontally across the top of the grate-bars 7 7, which are interiorly located or within the bore of the inner shelhd. As this particular boiler is a horizontal return-flue boiler, flues 8 S are disposed in the usual manner longitudinally within the water-space and connect with the main stack 9. i
To the rear of the grate-bars and interiorly of the water-space rises the bridge-wall 10, so called, which rests upon the inner shell, 4:, and is made hollow, having air-passages 12, which extend through the lower water-space and connect with the ash-chamber. I One object in my invent-ion is to prevent the excessive heat and overheating of the grate-bars, ash-chamber, and the adjacent parts, as now frequently occur; hence when the lower door leading to the ash-pit is opened the sudden rush of cool air therein forces the hot air outwardly back upon itself, in lieu of drawing it up through the grate-bars and fire. The draft is thereby checkedtemporarily. To obviate this overheatingl have located the grate-bars within the central bore of the boiler 2, a short distance above the lower water-space of the boiler, which extends therebeueath and forms an ash-chamber,l3. Access to the latter had by means of the door 14:; access to the fire by means of the door 15. llurthermore, exteriorly of I the boiler is disposed a jacket or iron plate, 16, circular in cross-section. (See Fig. 1.) This plate beneath the boiler extends from the front of the latter rearwardly therebeneath t a point behind but vertically below the bridge-wall. The chamber so formed I term the lower flSll-Cllftlll ber, l7. This is separated from the upper flue-space, 21, hereinafter (lGSCl'll'JECl, by two longitudinal partitions, 20, which unite the outer shell, I of the l'loiler with the external plate, in. Access to said chamber 17 is had by means of the door 18, which is to be auton'latically operated by means of some one of the numerous regulators now in use. The upper portion of said plate in aboveand about the boiler extends from the front to the return-lines S 8 and escaping to the stack are turned downward and compelled to pass laterally of the boiler in lieu of directly on top. The path of the gases diverted by the deflector 23 is indicated by arrows 0: so in both drawings.
Communication between the upper and lower ash-chambers is obtained by a series of air-fiues, 19 19, arranged transversely across the lower water-space of the boiler, and which connect the inn er and outer shells of the boiler at this point. In the present instance there are three rows, with the flues in the several rows alternating.
any cinder which may drop through the gratebars.
The fire is tended through the door 15, while the inner surface, 4, of the boiler-shell, or that adjacent to and beneath the grate-bars, is kept free from ashes by a utensil to be inserted through the door 14. The accum ulated ashes in the lower chamber, 17, are removed by way of the door 18, which is normally maintained open, the intermediate door, 14, being open only when cleansing the inner shell, 4, or when first starting the fire, when the lowest door, 18, may be shut.
During active service of the boiler the aircurrents therethrough are indicated by the arrows, first, by way of the door 18 to ashchamber 17 thence through the lower waterspace, transversely thereof, by way of the airlines 19 into the upper aslrchamber, 13, and between the grate-bars to the fire. From there the products of combustion are conducted in the usual manner over the bridge-wall, returned through the flues 8 8, thence upwardly and over the crown-sheet to the .main' stack.
hen the fire is first started, the intermediate door, 14, may be opened, but subsequently to be closed, when the lowest door is then employed to regulate the draft. construction the draft is increased. The parts surrounding the grate-bars are not liable to become overheated. Furthermore, the inner shell, 4, of the boiler beneath the grate-bars is readily cleansed, while the ashes which pass into the'chamber below are readily removed.
Moreover, said fiues are of sufficient diameter to admit passage of By this The system of pipes herein shown at the rear of the boiler for increasing the circulation is explained and described'in an application, Serial No. 280,479, filed July 20, 1888; hence I do not desire to make any claim therefor, but simply show them in connection with my present improvements.
What I desire to claim is- 1. The combination, in a steam-boiler having an annular water-space, of a hollow bridgewall interiorly of said water-space, an ashchamber exteriorly of said water-space, and air-passages 12, extending thereacross, which connect said ash-chamber with the chamber in the bridge-wall, substantially as specified.
2. In a steam-boiler having an annular water-space with draft-fines 8 8 longitudinally therethrough, the combination, with said boiler, of the grate 7, the hollow bridge-wall 10, the air-passage 12, the draft-fines 19 19 transversely of the lower waterespace, the
ash-chamber 17 below the same, and the doors 14 18, the latter operating automatically, substantially as and for the purposes set forth.
The combination, with aboiler constructed with an inner shell, 4, an outer shell, 3,00111- posing the water-space, and with the fines 8 8 therein, of the transverse draftefiues 19 19 eX- terior to and below the grate, the graterbars 7 7, arranged above the lower water-space, and the plate 16, inclosing the outer shell, 3, and forming beneath the said shell the ashchamber 17, and above and about said shell the flue 21, substantially as herein described. In testimony whereof I affix my signature in presence of two witnesses.
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