US938171A - Locomotive-boiler. - Google Patents

Description

S. A. REEVR,

LOUOMOTIVE BOILER.

APPLICATION FILED MAE. 2, 190a.

Patented Oct. 26,1909.

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UNITED STATES PATENT OFFICE.

SIDNEY A. REEVE, OF WORCESTER, MASSACHUSETTS, 'ASSIGNOR TO CHARLES F. BROWN, TRUSTEE, 0F READING, MASSACHUSETTS.

LOCOMOTIVE-BOILER.

Specification of Letters Patent.

Patented Oct. 26, 1909.

Application filed March 2, 1906. Serial No. 303,763.

tions through the length of the boiler, such type being illustrated in my prior patents Nos. 799,265 and 803,788.

The objects of the present invention are to secure an improved draft and an improved control of the several functions of the boiler, such as vaporizing, feed-heating and superheating.

Of'the accompanying drawings,Figure 1 represents a longitudinal section of a .locomotive constructed in accordance with my invention, Fig. 2 represents a section on the line 22 of Fig. 1; Fig. 3 represents a section on the line 3-3 of Fig. 1; Fig. 4 represents a transverse vertical section of the device 31 on the line 4t of Fig. 1.

The same reference characters represent the same parts in all the figures.

In the drawings 10 is the body of the boiler, 11 is the fire-box at the rear end, 12 is the smoke-box'at the forward end, 13 is the usual smoke-stackleading therefrom, and 14 is the nozzle directed into the smoke-stack and receiving exhaust steam in the usual manner from the cylinders 15. This boiler contains three sets of tubes, viz: vaporizing tubes 16, superheating tubes 17 and feed -heating tubes 18, the arrangement being substantially the same as shown in my Patent No. 803,788 aforesaid. The vaporizing chamber is formed by the lower wall of the boiler and two upright longitudinal partitions 19, 19 extending from end to end, and the group of vaporizing-tubes occupies the lower middle portion of the boiler. The feed-heating tubes 18 are arranged in two groups alongside of the vaporizing space below the upper edges of the partitions 19. Feed-water is supplied to the two, preheating spaces through pipes 21, 21 (Fig. 2), and, becoming heated in passing upwardly over the tubes 18,. it overflows into the vaporizing space. The vaporizing chamber and the preheating chambers have a common steam space in the upper part of the boiler shell and in this are located the superheating tubes 17 All tubes terminate in the front and rear tube-sheets, but the rear ends of only the vaporizingtubes 16 emanate from the fire-box 11. The rear ends of the feed-heating and superheating- tubes 18, 17 open into a rear gas chamber 23 which straddles the fire-box 11. In front of the forward tube-sheet is a gas chamber 24 adapted to connect the forward ends of the vaporizing-tubes 16 with the forward ends of the superheating-tubes 17 so that gases issuing from the former may returnthrough the latter to the gas chamber 23. Theforward ends of the feed-heating tubes .18 open directly into the smoke-box 12 alongside of the forward gas chamber 24 as,

in Patent No. 803,788 aforesaid. It will be apparent that if a complete circuit of the gases is allowed they will pass from the firebox 11 forward through the vaporizingtubes 16 into the gas chamber 2a, then rear-.-.

wardly through the superheating tubes 17 into the rear gas chamber 23 and then forwardly through the feed-heating tubes 18 into the smoke-box 12 and thence out of the stack 13. 25, 26, 27 are cinder pockets in the bottoms of the smoke-box 12 and gas chambers 24, 23.

i For the purpose of increasing the draft, I have added a smoke-stack 28 which leads to the atmosphere from the rear gas chamber rated by a partition 34 over the upper edge A doubleof which they communicate.

faced oscillating valve 35 operated by a handle 36 in the cab is adapted to shut off either nozzle 14 or 29 when in either of its extreme positions, or to stand in an intermediate position filling up the opening in the partition 35. Thus any relative strength :of blast may be obtained in the two stacks;

-nate blasts in'the-two stacks and each blast,

is stronger than if both nozzles received the exhaust of both cylinders.

In the front wall 37 of the forward g'as chamber 24 is an opening controlled by a.

pivoted "damper 38 whichis'actuated by a 'p handle 39 in the cab,'whereby=more or less of the gases issuing from the vaporizingtubes 16 may pass-directlyout'of the forward stack '13. Or, if-the'partition 37 be omitted-altogether, all of'the' gases'dra-wn -rearward-by the stack28 will have-both sets oftubes, 17 and 18, as their pathway.

'- In the operation ofthis apparatus,when- "ever the n'ozzle'29 of the rear stack is in operation some of the gases entering the forward gas chamber 24 will be drawn back through'the superheating tubes 17 and dis- 1 charged out of the stack 28, whether or not the damper 38 is open. WVhen saiddamper is closed all of'the gases take this path; and when-both stacks are in operation, some of the'gases will return forward through the preheating-tubes '18, thus making athird passage of-the' boiler as indicated by the forwardly-directeddotted arrows in Fig. 1. If 'only"theforward stack 13 is in operation and the damper-38 closed, all' of the gases will pass three timesthe 'lengthof the boiler. The draft is somewhat restricted in this case if the preheating surface '18 is relatively small in area,but such operation givesmaximum efliciencyi If only the forwardstack,-' as in any locomotive.

manner of -operat1ongives the maximum ward stack '13 isi-n operation and the damper 38- is open,*the gases will'pass only through the vaporizing-tubes 16 direct 'to thefor- This freedom' of draft and may be employed when the boiler is -forced, as in climbing grades.

1 If both 'stacks'be in operation and the damperbe"suificiently wide open, or if the partiti'on37 'be entirely absent, the flow of gases will berearward in both sets of tubes,

"17 and '18,-in paral-lel, giving a freer draft or permitting a smaller boiler-diameter for a given amount of superheating and feedhea'ting but the efliciency of this plan is notso' good as when the gases traverse the superheater-tubeS before entering the feed heating tubes. By using the superheatingl tubes 17the water-level may be carried very high without wet steam and thus the period of time'during which steam may be made without feeding is increased. My improved "arrangement of stacks and damper results in a better draft for this kind ofboiler and a and relative quantities of heat apportioned to the several sets of tubes.

What I claim as new and desire to secure by Letters Patent is:

1. A locomotive-type boiler having watervaporizing, steam-superheating, and waterpreheating surfaces, heating fiues adapted'to conduct the gases over said surfaces succes- 'sively" in the order named and in forward and return directions, a stack at the rear part of the boiler adapted to discharge a ortion of said gases before they have completed the entirepassage of said heatingsurfaces, and a second stack 'a't-th'e forward part of the boiler adapted to discharge-gases which have completed theentire passage.

' 2. A locomotive boiler comprising a boiler barrel having a furnace attherear-end,'vaporizing and preheating chambers withinsaid barrel at thesame level,'flues traversing-said chambers,-means forming a gas-passage connecting the forward ends of said fiues, and a stack at the rearend ofMthe 'pre-heating flues for discharging gases which havetraversed'the twosets-offiues. 3; A locomotive-type boiler comprising a boiler barrel containing vaporizing and-pie heating chambers alongside 1 each other and having a furnace at the-rear end, superheating surfaces for the steam, passages for con ducting the gases =first through'the vaporizing-chamber and then across the superheating-surfaces 1 and through thepreheating-chamberyand a single stack at the-rear part of the boiler adapted to dischargethe gases after'such transit.

4. A locomotive-type boiler having vaporizing, superheating, and preheating surfaces,

'fiues for conducting the furnace gasesover sald surfaces in forward and-returndire'ctions, a'gas-chamber at the'rear ofthe boiler connecting the superheating' and preheating passages and having a gas-discharge stack, a second gas-chamber at'=the' front of the boiler connecting the vaporizing and-super.

heating passages, and a third-gas-chamber at the front of the boiler'having a stack for discharging the gases from the-preheatingpassage.

5. A locomotive-type boiler comprising a firebox at the rear end, a smoke-box at the forward end, having a smoke-stack, longitudinal vaporizing, superheating and preheating tubes receiving the gases in the order 7 perfect control over the distribution of draft 6. A locomotive-type boiler having flues arranged for the passage of gases in opposite directions, a plurality of stacks for discharging said gases, a plurality of engine cylinders, exhaust pipes leading from said cylinders, exhaust nozzles directed into the said stacks, and an exhaust valve controllable from the cab and adapted to close either nozzle or connect the respective exhaust pipes with the respective nozzles.

7. A boiler containing vaporizing, superheating and feed-heating surfaces, a stack drawing over the vaporizing surface, a second stack drawin over the superheating and feed-heating sur aces, and means for varying the relative draft of said stacks.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses, the 26th day of February 1906.

SIDNEY A. REEVE.

Witnesses:

HENRY L. PARKER, HENRY L. PARKER, Jr.

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