US1084555A - Locomotive-boiler. - Google Patents

Description

J. M. IVIQCLE L'LON;

L OG'OMOTIVREOILER. APPLICATION FILED JUNE 20, 1007.

Patented Jan. 13; 1914 6 BHEBTEPSHBBT 1.

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J. M. MQGLELLON.

LOGOMOTIVE BOILER.

APPLIOATION FILED JUNE 20, 1907.

1 4,555. I Patented Jan. 13; 1914.

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Patented J an. 13, 1914.

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J. M. MQCLELLON. LOGOMOTIVE BOILER.

APPLICATION FILED JUNE 20, 1907.

Patented Jan 13, 1914.

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J. M; MaOLELLON.

LOOOMOTIVE BOILER.

APPLICATION FILED JUNE 20, 1907.

JAMES M. MGCLELLON, OF EVERETT, MASSACHUSETTS.

LOCOMOTIVE-BOILER Specification of Letters Patent.

Application filed June 20, 1907.

Patented Jan. 13,1914.

Serial No. 379,837.

To all whom it or cry concern Be it known that I, James M. McCLnLLoN, a citizen of the United States, residing in Everett, county of Middlesex. and State of lllassachusetts, have invented an Improvement in Locomotive-Boilcrs,of which the following description, in connection with the accompanying drawing, is a specification, like letters on the drawing representing like parts. i

This invention relates to boilers of the locon'iotive type and especially to the firebox thereof.

The objectof the invention is to provide a novel form of fire-box having water-tubes located within it for increasing the heating surface, which water-tubes are arranged in such a way that they batlle the hot. gases and operate to retain the hot gases in the firebox somewhat longer than is possible with other arrangements of water-tubes now c0rnmonly known or previously patented.

In the present invention the water-tubes extend diagonally across the combustionchamber of the fire-box from the lower back corner to the upper front corner, and thus stand substantially at right angles to the path of the hot gases. In this way the water-tubes act to batlle the gases and retain them longer in the firebox so that the full benefit of the heat generated may be obtained.

Referring to the drawings wherein I have shown some embodiments of my invention, Figure 1 is a longitudinal section ofa locomotive boiler showing, my improvements applicdthereto; Fig. 2 is a similar view showing a modified form of my invention; Fig. 3 is a similar view showing another modification of my invention; Fig. 4 is an enlarged section on the line w---."c, Fig. 1; Fig. 5 is a section onthe line z -'3 Fig. 1; Fig. (i is a sectional View showing still another modification.

3 is the shell or barrel of the boiler within which are the usual flues 4: that extend from the combustion chamber 5 of the tire-box to the smoke chamber (3. Said fines are sustained at one end in the fine-sheet 7 which forms one end of the chamber 6 and the other end in the flue-sheet 8 which forms the back wall of the coml'iustion chamber. These parts may be such as are commonly found in locomotive boilers and form no part of my present invention.

My improved fire box has a drum or water and steam chamber 9 at the upper front end side to side of the fire-box and into which the upper ends of the water tubes 11 are expanded. This drum has secured thereto the upper edges of the front sheet-s 23 and 24 which form between them the usual water leg at the front or door end of the firebox. Said water leg communicates with the inteiior of the drum through apertures 18 in the .att'er. r

In Figs. 1 and 2 the top of the fire-box is formed by a crown sheet 13 which is secured at its front edge to the drum 9 and at its rear edge to the flue sheet 8, said flue sheet being substantially rectangular in outline, as shown best in Fig. 5, and extending at the vcorners beyond the circular contour of the shell 3. V

In Figs. 1 and 3, 12 is an outer sheet which forms with the crown sheet 13 a steam space let, which outer sheet is riveted at its front edge to the drum 9 and at its rear edge either directly to the shell 3 or to :1. connecting sheet 14 which'in turn is riveted to said shell. Where a connecting sheet 14 is used it is substantially rectangular in shape and is provided with the flanged aperture into which the end of the shell is received and to which. it is riveted, as shown in Fig. 1.

A water leg, is formed at each side of the fire-box by the inner and outer sheets 20 and 21. The outer sheet 21 may be integral with the outer sheet 12 at the top of the fire-box I have herein shown the chamber 9 I or may be a separate sheet secured thereto at its upper edge, and the inner sheet 20 may be integral with the crown sheet 13 or may be a separate sheet having its upper edge secured to the edges of the crown sheet as desired. Both the sheets 20 and 21 at the sides of the firebox are cut to fit the drum 9, and are riveted thereto as seen in Fig- The drum 9 communicates with the space between the sheets and 21 at each side of the fire-box through suitable apertures 16 formed in the drum,

It will be noted that the chamber formed by the drum 0 is separate and distinct from the other water spaces of the boiler, although said chamber communicates with said other water spaces.

The water chamber 10 may be in the form of a drum but is preferably made by extending the flue sheet 8 below the shell 3 and bending the same to form one side of said water space. The other side of the water space may be formed by extending both the due sheet 8 and the connecting 1 1 beiow the shell 3 and bending them both to form the sides of the chamber. The lower edges of the sheets 8 and 1t preferably extend below the chamber to form the water leg 25, said sheetsbuth being secured to the usual filling ring .28. The sheets 8 and 14 may be connected at either side of the chamber 12 by suitable stay pieces 26 which are provided with perforations 27 to permit free communication between the chamber 10 and both the shell 3 and the water leg 25.

In Fig. 2 the crown sheet is omitted, and in lieu thereof I have shown closely arranged water tubes 130 which are connected at one end to the drum E) and at the other end are expanded into the flue sheet 8. These water-tubes, being closely arranged, serve a crown sheet, and they are covered by a sheet 12- si'milar to that shown in Figs. 1 and 3, which is secured at one end to the front edge of the drum 9 and at the rear edge to the connecting ring or sheet 14:-

The ends of the drum 9 are preferably bumped so as to avoid the necessity of staying and'are provided with manholes closed by suitable covers 29 so to afford entrance to the drum for expanding the water tubes 11 thereinto. The drum 9 is placed at substantially the level of the top of the shell, as will be plainly seen from Figs. 1 and 2, and the steam space 44: which connects the drum with the shell is above the normal water level so'that said space will be filled entirely with steam, and as stated above the chamber formed by the drum 9 is not merely an extension of the other water spaces of the boiler but is a separate independent chamber, al-' though it communicates with the other Water spaces of the boiler. The outer sheets 21 are also provided with manholes opposite the chamber 10 which manholes are closed by suitable covers 29, said manholes providing suitable access to the chamber 10 for expanding the lower ends of the water tubes 11 into the sheet 8 or for cutting said water tubes therefrom.

The sheets at the side of the fire-box are stayed in the usual way, and for staying the portion of the, sheets opposite the chamber 10 I propose to employ a stay rod 31 which extends clear through the chamber and is secured at its ends to the heads or covers 529. The sheets 20 and 21 at the sides of the firebox 39 leading to the fire-box, and these doors are closed suitable closures 40. These doors provide access to the chamber of the fire-box back of the water-tubes 11 for the ur )OSG of ex andin the fines at into the flue i z:

sheet 8 or for other repair work.

The water-tubes 11 extend clear across the fire-box from one side to the other thereof and thus act to completely baflle the hot gases on their way to the tines 4 and serve to hold the hot gases in the fire-box for a longer period than is possible with the ordinary construction. Furthermore, said watertubes provide a greatly increased heating surface in the fire-box and thus greatly increase the steaming capacity of the boiler.

This type of fire-box permits the use of a wide grate, and by arranging the fire-box as shown in Figs. 1, 2 and 3 the rear edge thereof nay be placed between two of the drivers thus permitting the fire-box to be set comparatively low upon the wheels.

In connection with the features thus far described I have shown different ways of superheating the steam generated in the fire-box.

In Fig. 1 I have shown if plurality of super-heating pipes 42 which are situated in the combustion chamber above. and back of the water-tubes l1. Said superheating pipes are connected at one end to a header or chamber 43 which in turn communicates with the steam space 44 above the crown sheet through suitable nipples or nipple a5, and atthe other end said superheating pipes are connected to another chamber or header 46 to which is connected a pipe 47 leading through the shell of the boiler and to the engine cylinders. lVith this construction the steam generated space above the crown sheet will pass through the superheating pipes 42 to the delivery pipe 47' and from the latter to the engine cylinders. The presence of the water-tubes 11 andsuperheating pipes 42 will prevent the crown sheet, 13 from burning out even though it is not covered with water. To prevent the superheated steam from becoming cooled during its transit through the shell 3 I propose to inclose the pipe 47 in a pro tee-tor pipe or large flue 48 which will prevent the water in the shell from coming directly in contact with the pipe 47. This large flue 4-8 preferably communicates at one end with the combustion chamber 5 and at the other end with the smoke chamber 6 so that at the other end the products of combustion may pass'through the flue around the pipe 47.

In Fig. 3 the superheating pipes are desigare also provided with doors or openings and accumulated in the A shell 3.

In the embodiment shown in Fig. 1 an extra door or opening 4:0 is provided in the side of the firebox above the superheating pipes t-2, said door forming means of getting into the combustion chamber above said superheating tubes for the purpose of expandingf the latter into the headers 48 and 46.

In Fig. 6 I have shown another modification of the invention wherein the chamber at the lower end of the water-tubes 11 is made of less diameter or size than shown in Figs.

' other respects however the invention shown in Fig. 6 is similar to that shown in the other figures of the drawing.

l-laving fully described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a boiler of the locomotive type, the combination with a barrel or shell, of a tire box having water spaces in its sides and front, a cylindrical drum separate from the fire box and extending transversely thereof at the top of the door endthereof, said drum having openings through its side which communicate with said water spaces, and other openings which communicate with the :lront water space of the fire box, a lower water chamber also extending transversely of the fire box at the opposite end thereof, and

water tubes connecting said chamber and drum.

2. In a boiler of the locomotive type, the combination with a barrel or shell, of a firebox having, its sides formedfrom two straight parallel sheets separated to form a water space, a cylindrical drum separate from said sheetsfand extending transversely of the lire box at the top of the door end thereof, the sheets forming the sides of the fire box being secured to the drum, and said drum having openings in its sides communicating with said water space, a water chamber extending transversely of the fire box at the opposite end'thereof, and water tubes connecting said chamber and said drum.

3. In a locomotive boiler, the combination with a barrel or shell, of a fire box having its sides formed of two sheets separated to form a water space, a drum extending transvcrsely of the fire box at the top of the door side thereof, said drum having" continuous sides and closed ends and being separate from said sheets but'being secured thereto, two separate sheets extending across the top of the fire box and also secured to said drum, the space between. said sheets communicating with the interior of the barrel or shell, and said drum having openings in its sides communicating with said space and also with the water spaces at the sides of the tire box. 1

t. In a boiler of the locomotive type, the combination with a barrel or shell, of a firebox having a drum extending transversely thereof at the front, and a lower chamber also extending transversely thereof at the rear, water-tubes connecting said drum and chamber, and means within the fire-box above said water-tubes for super-heating the steam.

5. In a boiler oi the locomotive type, the combinatimi with a barrel or shell, of a firebox at one end thereof, said firebox having av traiisvcrsely-exteuding drum at the top of the door end thereof, water tubes leading intn said drum and extending diagonally acros s he lire-box, and superbeating, tubes situated Within'lihe firebox above the water tubes. I

In testimony whereof, I have signed my name to this specification, in the presence of 100 .two subscribing witnesses.

JAMES M MoUlillLLON.

Witnesses: 7

Louis C. SMITH, lvlluwaiurr A. DUN N.

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