US207133A - Improvement in steam-boilers - Google Patents

Description

P. SALISBURY & 11. 0. SMITH.

Steam-Boiler.

No. 207,133. Patented Aug. 20,1878.

Whaiwem: ak/3221020.

Q W M convenient mechanism.

UNITED STATES PATENT OFFIon "eEone r. SALISBURY AND HENRY e. srnrmor new Haven. ooxn'.

IMPROVEMENT IN STEAM-30d LERS.

- Specification forming part of Letters PatentfNol 207,133, dated August 20,1378; application filed April 5,1878.

To all whom it may concern: 7

Be it knownthat we, GEonGE l. SALIS- BURY and HENRY (3. SMITH, of New Haven,

in the county of New- Haven and State of Connecticut, have invented certain new and.

useful Improvements in Steam-Boilers; and

we do hereby declare that the following is a This invention mares 'to s'team boilers; and

consists in the construction, combination, and

arrangement of the devices hereinafter described.

In the accompanying drawings, Figure 1 represents a vertical longitudinal section of a steam-boiler embodying our invention, taken through the line a: w of Fig. 2. Fig. 2*represcnts a plan view of the same, taken partly in section, on the line 3 y of Fig. I; and Fig. 3 represents a transverse vertical section through the line a z of Fig. 2. r V

A designates thecylindrical body of the I boiler; B, the fire-tubes, extending longitudinally through the same; C,the plates to which the ends of said tubes are attached; I), the smoke-box; E, the smoke-stack; F,- the front water-leg, and N the rear water-leg.

To provide the requisite strong draft we employ an exhaust-fan, Z, which is inclosed in a chamber or curved independent passage, 2,

which opens at one end into the said smokestack, and at the other end into the said smokebox. -It is inclosed in a protectingcasing, which prevents all communication with the outer air. This fan may be operated by any 1 It acts'wholly as an exhaust, drawing the air through the furnace and fire-tubes, and deliveriu git to the smokestack.

Damper X regulates the draft by closing the base of smoke-stack E more or less, as desired. When; said stack is closed at the bottom by said damper the draft is strongest; but in proportion to the size of the opening close connections at both ends.

will be the downward pressure of the air tending. to neutralize the draft.

W designates a vertical diaphragm in the back part of the furnace, and separated from its rear wall by a space, c. said diaphragm supports the inner ends of grate-bars G, which may be tubular in form.

. The fire-box is completed by a horizontal partition or top'plate, V, which extends from the inner face of the frontof the furnace to the top of'said vertical diaphragm, forming zontal partition protects the crownplate from being injured by sudden changes of temperature when cold air-rushes inon opening the.

door. y

The chief use of. diaphragm W is'to allow a downward draft to be used, thus avoiding waste of light particles of fuel and efi'ecting other desirable results. To start the fire an upward draft is, however,.desirable. -This is eflected by opening dampers t t in the bottom of the furnace and damper w in the upper part of diaphragm W. When these dampers are closed the draft is downward.

T designates a series of water-tubes extending across the furnace, slightly inclined, and arranged so as to be wholly embedded in the fuel. They extend from water-leg F to waterleg N, and serve for the generation of steam, and to produce acirculation of water therein. Their inclined arrangement facilitates the escape of steam, and by embedding them in the fuel we insure the application of a greater degree of heat than they could receive if merely subjected to the blaze below the fuel. N

H designates two or more perforated airpipes extending across the furnace horizontally below the grate, and supplying air for com bustion.

The outer air for the draft enters the furnace I through draft-door a.

Having thus described our invention, what we claim as new, anddesire to secure by Let ters Patent, is

1. The combination of a smoke-stack, smoke= 'box, and device for regulating thedraft with an exhaust-fan operating connection with the independent passage leading from the The lower edge of This horismoke-box to the smoke-stack, to produce a In testimonythat we claim the foregoing as draft through the furnace-fines, smoke box, our own we afiix our signatures in presence of and up the stack, as shown and set forth. two witnesses. t

2. The exhaust-fan Z, operating in connee GEORGE P. SALISBURY. tion with the independent passage leading HENRY 0. SMITH. from'the smoke-box to the smoke-stack, to pro- Witnesses:

duce a draft through" the furnace-fines, smoke- GEORGE TERRY, box, and up the stack, as shown and set forth. ROGER M. SHERMAN.

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