US750286A

US750286A - Water-tube boiler

Info

Publication number: US750286A
Authority: US
Publication date: 1904-01-26
Anticipated expiration: 1921-01-26

Description

PATENTED JAN. 26, 1904.

T. W. JOHNSON. WATER TUBE BOILER.

APPLICATION FILED MAR. 17, 1903.

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N0."750,28-6. PATENTED JAN. 26, 1904. T. W. JOHNSON.

WATER TUBE BOILER.

APPLICATION FILED MAR. 17, 1903.

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UNITED STATES Patented January 26, 1904.

PATENT OFFICE.

WATER-TUBE BOILER.

SPECIFICATION forming part of Letters Patent No. 750,286, dated January 26, 1904.

Application filed March 1'7, 1903.

To all whom, it may concern:

Be it known that I, THoMAs W; J OHNSON, a citizen of the United States, residing in the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Water-Tube Boilers; and I do hereby declare the following to be a full, clear, and exact description of the same.

The present invention relates to an improved water-tube boiler for use as a marine or as a stationary boiler, the essential features of the invention residing in so constructing the boiler as to entirely water-jacket the inner tube-cylinder of the boiler and in the arrangement of the heat-fines whereby the hot products of combustion completely envelop the waterjacket cylinder as conveyed from the inner tube-cylinder toward the outlet-stack for the utilized products of combustion.

By the hereinafter-described construction of a water-tube boiler the maximum heating-surface for the circulating water is obtained, the expensive heat-retaining covering ordinarily employed to protect the outer wall or shell of the boiler being dispensed with.

To comprehend the invention, reference should be had was accompanying sheets of drawings, wherein Figure 1 is a front view in elevation of the boiler, partly broken away. Fig. 2 is a broken perspective view of the boiler. Fig. 3 is a hori- Zontal sectional plan view taken through Fig. 1 of the drawings on the line 02 00. Fig. 4 is a similar view taken on the line e 'U of Fig. 1 of the drawings, and Fig. 5 is a; detail sectional view of the rear end plate or wall for the water-jacket cylinder or shell.

The numeral 1 is used to indicate the waterjacket cylinder, within which is arranged an inner tube-cylinder 2, which is considerably smaller than the outer cylinder 1. Through this inner cylinder extends a series of watercirculating tubes or flues 3, which tubes are run at an inclination. Each tube 3 projects through the end walls 4 5 of the cylinder 2, so as to communicate with the water-circulating chamber 6 which surrounds or envelops the said cylinder 2.

Within the cylinder 2,near the bottom thereof, is located the grate 7. The distance exist- Serial No. 148,150. (No model.)

ing between the bottom series of tubes or fiues 3 and the upper surface of the grate 7 may be said to constitute the fire-box 8 for the improved boiler.

From the inner cylinder 2, near the top thereof, extend from each side thereof a series of laterally-projecting flues 9 10 for the outlet of the hot products of combustion. These lines connect, respectively, with the heat-circulating flues 11 12, which flues are formed between the outer wall of the cylinder 1 and the inner wall of the inclosing shell 13. These heat :circulating fiues are closed at one end and successively alternate as to the discharge thereof, the discharge end of the fiues 11 being substantially diametrically opposite to the discharge end of thefiues 12. Each flue communicates with and discharges into the outlet-chamber 14 for the stack 15. The heat entering the circulatingfines 11 from the outlet-fines 9 is conveyed around the cylinder 1 and discharged into the outlet-chamber l t at points substantially opposite the receiving end of the said fines, while the heat entering the circulating-fines 12 from outletfiues 10 is caused to circulate around the cylinder 1 in an opposite direction to the heat circulating through the flues 11, the heat passing through the flues 12 being discharged into the outlet-chamber Mat points substantially opposite the receiving ends thereof. The hot products of combustion from within the inner cylinder 2 are thus distributed and caused to circulate in opposite directions entirely around the outer "cylinder 1. By this arrangement the watercirculating through the Water-tubes 3is heated by the hot produets of combustion bearing directly upon the tubes within theinner cylinder 2, the said tube being enveloped by the heat, while the water circulating within the water space or chamber 6 is maintained heatedby the hot' products of combustion circulating around and enveloping the cylmder 1. The water is thus evenly heated throughout, and as the pressure is evenly distributed inside and outside of the inner cylinder bulging of the walls, due to expansion and contraction, is obviated.

In order that the water may be fed into the boiler at a raised temperature, a water-tank is formed at each side by means of the tankshells 16 16, attached to the sides of the outer shell 13. ater-receiving tanks or compartments 17 are thus provided into which the water is received for feeding to the boiler. The water within these tanks or compartments is maintained heated by the heated wallof the shell 13, which is heated by the hot products of combustion bearing against the inner face thereof as circulating within the flues 11 12.

The upper portion of the water-space 6, or that portion immediately above the top of the inner cylinder 2, forms a contracted steamchamber 6. Owing to the smallness of this chamber it is deemed advisable to introduce within the outlet-chamber 14 of the stack 15 a steam-drum 7, which drum communicates with the chamber 6' by means of the connection 8.

To give proper rigidity or stiffness to the ends or heads of the cylinders, the ends 4 4c and the ends 5 5 are united by a series of staybolts 8 The space below the grate 7 forms an ashpit 9, from which the ashes are withdrawn through the opening 10. Fuel is delivered into the fire-box 8 through the openings 12 12 These openings are closed by-the doors 13, while the ash-pit opening is closed by the door 14. To form these openings, corresponding openings are formed in the face of the cylinder heads or ends 4 4: The metal surrounding the openings of the end or head 4 is outwardly flared, while that surrounding the openings of the end or head 4 is inwardly flared. The projecting flanges 2 2 thus formed overlap when the ends or heads are positioned and are hammered, riveted, or otherwise united.

To the inner face of each head or end 4 5 a series of disks 3 are secured by means of the bolts 3 passing therethrough, which bolts are held in place by the nuts 2 secured to the projecting end thereof. A disk 3 is provided for each water-tube 3, which disks when the ends or heads 4 5 are in position come directly opposite the open ends of the said tubes. These disks cover tube-openings 4: in the ends or heads, the purpose of which is to enable a leaky or defective water-tube to be easily removed or withdrawn for the purpose of inserting a perfect one orto enable the tubes to be readily cleaned of scale which may have accumulated therein. To withdraw a watertube, it is only required to remove a disk 3' corresponding to the position of the tube. The tube being released from its cylinder 2 the same is slipped from place and passed out through one of the uncovered openings 4 To clean the water-tubes, the disks 3 of one of the heads or ends are removed, when access may be had to the said tubes.

The front end or head 4 is provided with the manholes 17, through which a workman enters to gain access to the interior of the boiler. These manholes are formed in the same manner as the openings for the fire-box and the ash-pit.

Having thus described the invention, what is claimed as new, and desired to be protected by Letters Patent, is-

1. In a boiler for the described purpose, the combination with the outer cylinder, of an inner water-tube cylinder arranged therein, a water-space surrounding the inner cylinder with which the tubes of said cylinder communicate, and heat-flues arranged to convey the hot products of combustion entirely around the outer cylinder, said flues connecting with the interior of the inner cylinder by means of laterally-extending flues leading therefrom.

2. A boiler for the described purpose, the same comprising an inner and an outer cylinder, a water-circulating space existing between the walls of the cylinders, a series of water-circulating tubes extending longitudinally through the inner cylinder and communicating with the water-circulating space, a series of heat-circulating flues surrounding the outer cylinder, said flues communicating with an outlet-chamber at alternate sides of the outer cylinder, and a series of laterallyextending flues leading from the inner cylinder at opposite sides and alternately connecting with the heat-circulating flues of the outer cylinder.

3. A boiler for the described purpose, the same comprising an inner and an outer cylinder, a water-circulating space existing between the inner cylinder and the outer cylinder, a series of water-tubes extending through the inner cylinder and communicating with the water-circulating space, and heat-circulating flues surrounding the outer cylinder for receiving the hot products of combustion from the inner cylinder at opposite points and discharging the same into an outlet to the stack at points opposite to the receiving-points.

4:. A boiler of the character described, the same comprising an inner cylinder and an outer cylinder, the ends or heads of said cylinders being united, a water-circulating space between the walls of the said cylinders, watercirculating tubes extending longitudinally through the inner cylinder, and communicating with the water-space, and a series of heatcirculating flues surrounding the outer cylinder, said flues communicating with the inner cylinder from opposite sides.

5. A boiler of the character described, the same comprising an inner and an outer cylinder, a water-circulating space between the inner cylinder and the outer, and heat-circulating flues surrounding the outer cylinder for receiving the products of combustion from the inner cylinder and leading the same in opposite directions around the outer cylinder.

6. A boiler of the character described, the same comprising an inner cylinder and an outer cylinder, a water-circulating space between the inner cylinder and the outer cylinder, a steanrdrum communicating with the interior of the outer cylinder and heat-circulating flues surrounding the outer cylinder, said fines receiving the hot products of combustion from the inner cylinder and conveying the same in opposite directions around the outer cylinder.

7. The combination with an outer cylinder, of an inner cylinder arranged therein, a Water-circulating space between the inner and the outer cylinders, water-tubes extending through the inner cylinder and communicating with the water-circulating space, heat-circulating flues for leading the products of combustion from the inner cylinder and conveying the same around the outer cylinder in opposite directions.

8. In a boiler of the described character,

the combination with an outer cylinder, of an inner cylinder arranged therein, a Water-circulating space between the cylinders, a series of Water-tubes extending through the inner cylinder and communicating with the Watercirculating space, a series of heating-fines surrounding the outer cylinder, said flues cornmunicating with and receiving the products of combustion from the inner cylinder at opposite points, and Water-receiving compartments which receive the feed-Water for the boiler. v

In1 Witness whereof I have hereunto set my hanc.

THOMAS W. JOHNSON.

Witnesses:

N. A. AoKER, D. B. RICHARDS.