US1725463A - Water-tube boiler - Google Patents

Description

Aug. 20, 1929. Q a UNDSTROM 1,725,463

WATER TUBE BOILER Filed 1924 2 Sheets-Sheet l m unn gwumtoa 5m azmszzm,

Aug. 20, 1929. c. B. LINDSTROM WATER TUBE BOILER Fil d v- 1924 2 Sheets-Sheet 2 gwventoc ooooo amzzmzazwn,

Patented Aug. 20, 1929.

.UNITED STATES CLAUDE B. LINDSTROM, OF COSCOB, CONNECTICUT.

WATER-TUBE BOILER.

Application filed November 11, 1924. Serial No. 749,166.

This invention relates generally to water tube boilers, an object of which is to provide boiler construction which combines the advantageous features of both the vertical and horizontal water tube boilers now in use.

A further object of the invention is to so combine these features to enable the construction of boilers of larger capacities.

A still further object is the combination fire box and water tube boiler having baffles so arranged as to obtain greater benefit of heat units from the fire box than has heretofore been possible, the construction permitting of the effective and economical use of fuels such as oils and cheaper grades of bituminous coals with a minimum of smoke waste.

A further object is the provision of the novel staying means herein disclosed for rigidly maintaining the boiler sections in proper position and against distortion incident excessive temperatures and high internal pressures.

WVith these objects in view, together with others which will appear as the description proceeds the invention consists in the novel construction, combination and arrangement of parts, all as will be described more fully hereinafter, illustrated in the drawings, and

particularly pointed out in the claims.

In the drawings:

Fig. 1 is a longitudinal sectional view taken through a boiler constructed in accordance with the invention,

Fig. 2 is a fragmentary front elevation of the structure shown in Fig. 1,

Fig. 3 is a fragmentary side elevation of a boiler of slightly modified form, and

Fig. 4 is a fragmentary front elevation of the structure disclosed in Fig. 3.

This combination fire box and water tube boiler includes inner and outer casings 5 and 6 respectively, the inner casing including the fire box and combustion chamber. The casing 5 is provided with a convex crown sheet 7 with depending side walls or sheets 8, and to resist pressure the crown sheet may be stayed or reinforced with bars 9 at proper intervals securely welded in place. These bars are preferably provided with spaced openings 10 to permit of proper circulation of water in the boiler.

The forward portion of easing 8 is provided at its bottom with the usual grate 11, at the rear end of which rises the usual bridge wall 12, and stoking is carried out. through the door opening indicated at 13.

The outer shell or casing 6 properly oncloses the inner casing and provides a substantially large chamber 14 at the upper end of the boiler and spaces providing water legs 15 at both sides and at the front and rear of the boiler. The front and rear heads of the outer casing are suitably braced by means of stays 16, and the two casings are rigidly secured together by a series of Ttays 17 arranged within the several water egs.

It will be understood that suitable leadin and take-off pipes may be connected with the boiler at proper and suitable places. It will also be understood that the connection of the heads with their respective inner and outer casings will be made in accordance with the uses to which the boiler will be subjected, and these connections may be carried out by fianging and riveting or may be welded for low pressure boilers.

The inner casing 5 is provided with a pluralit-y of tubes arranged vertically, and in such manner as to obtain maximum efficiency from the fuel employed. These tubes are indicated at 18, and are arranged in spaced parallel relation from one end to the other within the inner casing. The tubes 18 are disposed vertically within this casing and establish communication between the chamber 14 at the upper part of the boiler and the water legs 15 at the sides of the boiler. The tubes extend well down into the fire box so that the lowermost of said tubes are disposed relatively close to the fire bed. The tubes are preferably arranged in banks; the lower ends of the tubes of each bank communicating with the adjacent water legs at the sides of the boiler. The outer Wrapper or casing 6 is provided with openings closed by suitable caps 19 in alignment with the lower ends of tubes 18, to permit of cleaning the tubes or repairing them when necessary.

The bridge wall 12 has rising therefrom a baffle 20 of suitable refractory material, which is of a breadth equal to the width of the inner casing 5, while rearwardly beyond this baflie is arranged a similar depending bafile 21, secured at its upper end to the crown portion of the casing 5. The baffle 20 has its upper end disposed below the top of easing 5, while baffle 21 terminates well above the bottom of the combustion chamber, so that the products of combustion rising from the fire box musttake a circuitous path around the ballles and incidentally in intimate contact with the tubes 18 before escaping through the smoke pipe 22.

It is apparent that this structure provides an enlarged combustion chamber hav ing the water tubes so associated therein that a maximum degree of heat will be obtained from the fuel consumed, and by reason oi this enlarged combustion chamber the more or less volatile fuels may be eliectively used.

The structure disclosed in 3 and i is the same as that heretofore described, except that the vertical baiiies are dispensed with, a horizontal baiilc is employed and the smoke pipe is disposed at the forward end of the boiler. In this form of the invention, a horizontal batl'le 23 of refractory material disposed well above the bridge wal 12, and terminates at its rear end a substantial distance inwardly from the rear head of the inner casing. The smoke pipe communicates with the inner casing near the upper portion thereof and immediately above the horizontal plane of ballle v In this form of the invention the products of combustion pass from the fire box rearwardly over the bridge wall 12 and in close contact with thevarious water tubes, then around the rear end of battle 23 and pass forwardly through the banks of tubes to the smoke escape pipe 22. By providing this enlarged area within the casing, it is apparent that thorough combustion and burning of the gases within the inner casing will occur before the waste eventually passes through the smoke pipe.

It Will be understood, of course, that any preferred ,or desired means for securing the crown and side sheets to the heads: may be employed, and any preferred method or manner of arranging the tubes and connecting them at their respective ends with the crown and side sheets of the inner casing may be used. It will be understood, furthermore, that the banks of tubes diverge at their lower ends so that communication between the compartment 14 and the water legs on each side of the boiler is assured.

Having thus described my invention, I claim:

In a boiler, outer and inner casings having their walls spaced apart to provide an upper Water and steam compartment and water legs on all sides of the boiler, tubes arranged in banks in said inner casing and establishing communication between said upper compartment and said water legs, each tube having right angularly disposed portions connected by a gradual bend and one oi said portions longer than the other, the longer portions of said tubes connected with the said upper compartment and disposed vertically while the shorter portions of said tubes are disposed horizontally and connect with said water legs, said banks extending throughout the length of the inner casing and in the path of the products of combustion in the latter, the tubes of each bank being of equal length and parallel to each other and the said banks spaced equal distances apart, and bafiles among said tubes to cause the products of combustion to take a sinuous course therethrough.

In testimony whereof I afiiX my signature.

CLAUDE B. LINDSTROM.

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