US113298A - Improvement in tubular steam-boilers - Google Patents

Description

UNITED SfrA'rEs PATENT OFFICE.

JAMEs HOWARD AND EDWARD rrENNEY RoUsrIELD, or BEDFORD,

ENGLAND.

IMPROVEMENT IN TUBULAR STEAM`BO|`LERS. Y

Specification forming part of Letters PatentNo. ll 3,298, dated April/1, 187i.

To all whom fit may concern:

Be itl known that we, JAMES HOWARD and EDWARD TENNEY BoUsErELD, of Bedford, in the county of Bedford, in England, have invented a new and useful Improvement in Tubular Steam-Boilers and we do hereby declare that ,the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make land use the same, reference being had to the accompanying drawing, forming part of this specication. The tubular steam-boilers for which We have already obtained. Letters Patent have been Constructed of groups of tubes consisting of horizontal main tubes and vertical tubes rising from them, the steam being collected from the upperend of each vertical tube by a dischargepipe common to the whole of the vertical tubes in the group.

Boilers composed of groups of tubes thus arranged, although generally successful, have been found under certain circumstances to possess some disadvantages. Thus, for example, a considerable height or headway is required to allow of the removal of a section or group of tubes or of a-'single tube from the group, and this in confined situations, as on shipboard, is objectionable, and cannot always be secured. l

The short connecting-tubes and the horizontal tubes over them also render the examination and removal of Va vertical tube somewhat difficult.

By our present improvements these disadvantages are overcome, and other advantages, to be presently noticed, are also secured, thus rendering theboiler specially suited to marine and locomotive purposes.

We construct our improved boilers of sections or groups of tubes so arranged that the main connecting-tube of each section will be in or approach a vertical position, with smaller tubes projectingfrom one side of it, say, at right angles thereto, and secured to it by any approved method.

The tubes which stand out at right angles to the main tube we prefer to connect by water and steam ways with each other at both ends.

In the accompanying drawing Vour improvements are shown as applied to the construction of amarine boiler provided withtwo hre-places, set abreast of each other.

Figure lis front view of the boiler. Fig. 2 is avertical section taken in the line l 2 of Fig. l. Fig. 3 is a vertical transverse section taken in the line 3 40E Fig. 2 and Fig. trepresents a horizontal and transverse section of elastic packing-rings or washers we propose to use in packing the joints.

Similar letters of reference indicate corresponding parts. By reference to Fig. 2 it will be seen that the improvedboiler is canted toward the front, and consequently the main tubes which constitute the back of the boiler, and would otherwise be vertical, Vhave their upper ends slightly inclined forward. It follows, therefore, that the tubes which are connected therewith and stand forward at right angles thereto, are slightly canted out of the` horizontal. This is done to facilitate the circulation of Water and steam in the boiler.

For the sake of clearness we will, however, in speaking of these tubes, refer to them as the vertical and the horizontal tubes, respectively. t, a, a a is a series of vertical tubes, formed with iiattened sides, and flttin g close together, so as to form a closed back for the furnace. f

Connected with each of .these tubes is a group of horizontal tubes, b b b, which are set parallel to and one above the other. These tubes Ab may be screwed directly into the tubes a but we prefer to adopt the screwed coupling-collars c, claimed under our patent vof 25th May, 1869, No. 90,450.

In forming those sections which are intended to constitute the sides of the border, we place 'the tubes b b close together, as shown at Fig.

3, and they thus form the side walls of the furnace. The front ends of the tubes b are closed with a screw-plug, d. These screwplugs are each fitted with a short central tube, which tubes communicate with the vertical tubes e c, which extend the whole depth of their several sections. The tubes c e are closed at bottom, and severally connect at their upper ends with a transverse steam-pipe, t'.

This arrangement of the tubes and connections enables us, by simply disconnecting the tubes b of either section from the supply-pipe K and the vertical tube eto withdraw such the water-supply pipe k. 'Y W To givefreadyaccess to the lowestnrowof Y tubes b, which connect with the water-supply pipe, this pipe is fitted with caps kf, the removal of which will allow of the cleaningout of the tubes that are in line with the uncovered' openings.

In order to insure tight joints for these covers, and for butt joints at other parts of the boiler, we have devised a novel kind of packing-ring, which is shown in place at y in Fig. 2, and is drawn on an enlarged scale at Fig. 4. On this packing-rin g we shall apply for a separate patent, and in that application particularly point out its merits.

To provide for the rapid circulation of the water, we t into each horizontal water-tube which is near or adjacent to the fire a modication of the internal tubes described in our v former patent. These inner tubes (shown at f) are open at both ends, the end near the screw-cap being left free, or supported in a central position merely by struts or spurs q. The other end of these tubes projects to about the middle of the tube a, and it is cut off at a sharp angle. The object of thus projecting the tubes f into the vertical tubes a, and of cut. ting off their ends at a sharp angle, is to provide increased facilities for the circulation of the Water in the tubes.

When the heated gases of the furnace impinge on the outside of the water-tubes the steam and heated water will pass along the horizontal tubes b and rise in the vertical tube a. The said projecting ends of tubes j' arrest the'up-flowing currents in a'to some extent,

causing them to ow into tubes b below tubes f,thereby favoring the escape of the water from the latter above the projection.

The horizontal tubes above the water-line to a shortV distance belowmthe water-level; .ont .e .e we insert within each of these vertical tubes a a smaller vertical tube to receive the ends of the tubes f, and thus form a division in the tubes a. By this means an upward and downward current will be established within the vertical tubes a, and an efficient circulation of the water will be thereby secured throughout the sections. f

Having thus described our invention, we claim as new and desire to secure by Letters Patent- 1. The vertical tube a, combined with the series of horizontal tubes b and their centrallyarranged circulating-tubes f, as and for the purpose described.

2. The arrangement of the circulating-tubes f upon spurs axially within thehorizontal tubes b, and projecting therefrom at one end, as and for the purpose specified.

3. The construction of the circulating-tubes f, each wit-h projecting end cut obliquely, as and for the purpose specified.

In witness whereof we, the said JAMES HOWARD and EDWARD TENNEY BoUsFIELD, have hereunto set our hands the 5th day of December, in the year of our Lord 1870.

JAMES HOWARD. EDWARD TENNEY BOUSFIELD.

Witnesses:

H. K. WHITE,

66 Chancery Lame. M. WYNN,

24 Royal Exchange.

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