US1293644A - Water-tube boiler. - Google Patents

Description

P. J. HEALY.

WATER TUBE BOILER.

APPLICATION FILED FEB. 20. 1918.

Patented Feb. 4, 1919 4 SHlzETS-SHIIET trig? M w 1 Am s 14H ii? H x f F! WITNESS A TTOR N E 1Q? P. J. HEALY.

WATER TUBE BOILER.

APPLICATION FILED FEB. 20. 1918 Patented Feb. 4, 1919.

4 SHEETS-SHEET 2.

WITNESS A TTORNE Y5 P. 1. HEALY.

WATER TUBE BOILER.

APPLICATION FILED FEB. 20, I918. II ggg eqgg Patented Feb. 1, 1919.

4 SHEETS SHEET 3.

WITNESS 11v VENTOR.

i wzfz w'wk JI/Ffe A TTORNE Y3 P. J. HEALY.

WATER TUBE BOILER.

v APPLICATION FILED FEB. 20, I918. LQQS MQLD Patented Feb. 1919.

4 SHEETS*SHEET 4- WITNESS INVENTOR. fiaafwdar Jfflemgr A TTORNE Y ends of the endmost tubes 5, as shown in Fig. 2.

The vertically disposed tubes 6 forming the heads of the boiler serve as a support for the main. circulating tubes indicated at 7. These tubes are superposed as shown and they are sufficiently separated to permit the hot gases of combustion to pass freely therebetween, as will hereinafter be described. The main circulating tubes 7 are also placed on an angle, as shown, to facilitate circulation and they furthermore serve the purpose of bracing the boiler lengthwise and also serve the purpose of supports for a pair of superposed bafiie plates constructed of fire brick or the like, such as shown at 8 and 9. The main fire box is built in between the main mud drums A and is preferably bricked up, as shown at 9, if oil is burned, or provided with grating if a coal fire is used.

Each main steam drum is provided with a dome 10 and a safety valve 11 of the usual construction and each drum is also provided with a feed pipe 12, which feed pipes are joined, as shown at 13. Each feed pipe is provided with a valve 14 to permit the steam entering the drum to be led to escape directly through the feed pipes, if desired, but these valves are normally maintained closed as the novel arrangement of superheating pipes has been provided to permit the steam to pass from the respective drums into the feed pipe. This is accomplished by placing a series of coil tubes crosswise of the boiler above the main circulating tubes 7 as shown at 15.

One end of each coil tube is connected with a. steam drum B, as indicated at 16, while the opposite end is connected with a feed pipe 12, as at 17; that is, steam entering the drums B through the tubes 5 and 6 cannot escape directly through the feed pipes when the valves are closed except by passing out through the connections 16, then through the superheating coils, and finally through the connections 17 into the feed pipes 12. The steam is in this manner thoroughly superheated before it can finally escape from the boiler and its efiiciency in value is thereby considerably increased.

The boiler shown in the present instance is provided with a pair of oil burners 18, each supported by a door 19. The fire or hot gases of combustion will, therefore, first enter the fire box in the direction of arrow a. It will here strike the brick work at the end of the boiler and will thus be deflected and returned in the direction of arrow 5 under the bafiie plate 8. The hot gases on returning will then strike the front head and will again become deflected and returned in the direction of arrow 0 between the main circulating tubes 7. The gases will again strike the rear head and are thus finally deflected in a forward direction and y will thus pass between the superheating coils 15 before they can escape through the stack 21. The hot gases, due to the structure of the boiler and the position of the baffle plates, pass endwise between the tubes several times, thus rendering it possible to obtain greater heat efiiciency, The 'structure, furthermore, makes it possible to provide an enlarged heating area as all parts of the boiler are constructed of tubing, through which the water circulates and which is all exposed tothe hot gases, this being true of the main shell, the heads, the drums, the main circulating tubes and also the circulating tubes.

The main end tubes 6 which support the main circulating tube 7 may be provided with removable handhold plates, such as shown at 22, to permit easy access to the tubes 7 when it is necessary to clean the same or renew tubes at any time. The steam drums, together with the mud drums, are all provided with manhole covers, such as shown at 23, thus rendering all tubes accessible for repairs and cleaning.

The front head of the boiler, shown in Fig. 2, is in reality provided with an auxiliary mud drum 2 1. This is merely provided to permit the insertion of a peek hole and air admitting door 25. This door swings inwardly and is positively locked against outward movement as its lower end engages the inside of the end mud drum 2. This is of considerable importance as it positively prevents flare backs from fire or an excess escape of steam if any tube should burst, thus to a great extent eliminating the danger to which firemen are so often exposed.

The construction of the doors 18 also forms an important feature of the invention as they not only serve as supports for the oil burners when these are employed, but they also serve as an ideal means for ad mitting the air required. Each door is rigidly and. permanently fastened to the front of the fire box and consists of a front plate 28 and a series of inclined horizontal and vertical baffle plates 29, together with a horizontal inner plate 30 and a pair of side plates 31; the function of the several plates described being to deflect the air and guide it downwardly against the bottom of the fire box, thus heating it thoroughly before it strikes the tubing of the boiler. This is of great importance as cold air when striking the tubes causes such a variation in expansion as to materially injure the tubes within a short time. These doors also take care of flare backs due to improper combustion and furthermore serve as a means for dissipating or deflecting escaping steam from bursted tubes to such an extent as to prevent injury to the firemen.

The construction as a whole adapts itself readily for locomotive boilers as its length and shape may be such as to conform to the standard lines of a locomotive, it being preferable, however, to build the boiler in two or more sections when employing it for locomotives to render the forward part more cylindrical in shape than the rear section.

The use of the boiler should, however, under no circumstances be limited as it readily adapts itself for any other use, such as marine, stationary, and the like.

The main tubing 5 and 6, forming the shell and heads of the boiler, should be covered with asbestos and an exterior covering of sheet, iron to retain the heat and a horizontal flue 21 forming in connection with the bridging or stack 21 permits the gases to freely escape after they. have passed between the superheating coils 15 and the intermediate tubes 6. This part of the boiler may also be covered with insulating material if desired to lower the boiler room temperature as much as possible. Ialso wish it understood that the materials and finish and the specific arrangement of the parts described may be such as the experience and jucllgment of the manufacturer may dictate.

aving thus described my invention, what I claim and desire to secure by Letters 'Patent is 1. In a water tube boiler, a pair of side mud drums, a pair of superposed steam drums, the side mud drums being located considerably beyond the outer sides of the respective steam drums, a series of vertical side tubes connected at their lower ends to the mud drums and having their upper ends curved inwardly and connected to the outer sides of the steam drums, intermediate tubes connected at their ends to the inner sides of the respective steam drums and arranged between the ends of the latter, horizontal end tubes connected at their ends to the respective steam drums, end mud drums connecting the side mud drums, and vertical head tubes connected'to the horizontal end tubes, to the steam drums and to the bottoms of the curved upper ends of the endmost vertical side tubes.

2. In a water tube boiler, a pair of side mud drums, a pair of superposed steam drums, a series of vertical side tubes connected at their lower ends to the mud drums and having their upper ends curved and connected to the outer sides of the steam drums, intermediate tubes, connected at their ends to the inner sides of the respective steam drums, horizontal end tubes connected at their ends to the respective steam drums, end mud drums connecting the side mud drums, a series of spaced vertical head tubes at each end of the boiler connected to the horizontal end tubes, to'the steam drums and to the curved upper ends of the outermost vertical side tubes, and a double series of inclined lengthwise circulating tubes for each pair of the corresponding opposite vertical head tubes at the boiler ends connected at their ends to each of the respective vertical head tubes comprising said pairs.

3. In a water tube boiler, a pair of side mud drums, a pair of superposed steam drums, a series of vertical side tubes connected at their lower ends to the mud drums and having their upper ends curved and connected to the outer sides of the steam drums, intermediate tubes connected at their ends to the inner sides of the respective steam drums, horizontal end tubes connected at their ends to the respective steam drums, end mud drums connecting the side mud drums, spaced vertical head tubes connected to the horizontal end tubes, to the steam drums and to the curved upoper ends of the outermost vertical side tu es, the central head tubes at one end of the boiler having their lower ends cutaway to form a'door opening, an auxiliary horizontal short mud drum connected to the lower cutaway ends of the head tubes and having its ends connected to the next adjacent head tubes to form the top of the door opening, the end mud drum at the boiler front forming the bottom of the door opening, and a door in the door opening having its lower side engaged with said front end mud drum.

4. In a water tube boiler, a pairof steam drums at opposite sides of the Boiler, side mud drums, a series of vertical side tubes connected to the mud drums and having their upper ends curved inwardly and connected to the steam drums, intermediate tubes connecting the steam drums, a steam delivery pipe for each steam drum seated on the respective curved upper ends of the vertical side tubes, and a series of superheating tubes for each steam drum, each'su-perheating tube being connected at one'end to a steam drum and at its opposite end to the delivery pipe of that drum, the intermediate portions of the superheating tubes extending across the boiler and underlying each of the steam drums.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

PATRICK J. HEALY.

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