US1687784A - Sectional heating boiler - Google Patents

Description

Oct. 16, 1928.

H. H. PEEK SECTIONAL HEATING BOILER 4 Sheets-Sheet 1 Jwomtw Filed May 18, 1925 Wmq Oct. 16, 1928.

FIE- 5- FIE- 4.

FIG. 5.

H. H. PEEK SEGTIONAL HEATING BOILER Filed May 18, 1925 4SheetsSheet 2 Oct. 16, 1928.

H. H. PEEK SECTIONAL HEATING BOILER Filed May 18, 1925 4 Sheets-Sheet 3 m muk. 6E N m? Oct. 16, 1928.

H. H. PEEK SECTIONAL HEATING BOILER 4 sheets-sheet Filed May 18, 1925 mm @Nk mm mt WNQMK wwmhh s PatentedQct. 1c, 1 28.

UNITED STATES,

nonAcnH. rEEK, or CHATTANOOGA, I 'rnnmissnn.

sncrromu. HEATING BOILER.

Application'filed May 18, 1925. Serial No. 30,990.

This invention relates to heating boilers and comprises all improvements over the prior art which are disclosed in this application. One object is to provide a sectional heating boiler which shall have certain marked advantages overthose now in use. Prior to my invention, sectional heating boilers haveall been composedof sections made of cast iron. Such a boiler is necessarily relatively thick and heavy and of nonuniform thickness owing to the inherent difli- 'culties of casting. The metal is non-homo erly weld the casting defects in cast iron sections'so as to permit the sections to be used with safety. For the'same'reason, when a section rusts through prematurely,.it cannot be properlywelded, but must be replaced by new section, whichnecessarily involves considerable expense and delay. Owing to the strains set up in the metal due to the sudden and unequal cooling when being cast, and due to the inherentbrittleness of cast iron, cracks are liable to occur spontaneously, or

due to a sudden mechanical blow on a section,

.or when the boiler isfired. In actual practice, fires are sometimes built in boilers in which there is no water, or in which the water is low, or during operation, the water.

is permitted to get 'too low. Thus the cast.

iron. not in contact with'water but directly in contact with hightemperature, becomes overheated and when water is turned into the;

boiler to replenish the supplypthesudden chilling sets-up strains which'arefrequently in which they are under substantial pressure,

suc-h cracks result in explosions.

Toovercome the above. drawbacks and to secure other important advantages,I make a sectional heating boiler in which each sec-- tlon is composed of preferably two pleces of sheet metal, preferably steel, pressed to shape to form complementary parts and joined together, preferably by welding. In a boilersoconstructed, the metalis thinner and the boiler is much lighter. In a sectional boiler,

of necessity only 'aportion of the surface transmission to the water is limited. By

making the boiler of sheet metal the rate of heat transmission is substantially increased due tottwo reasons. First, the sheet metal sections are made'much thinner than is possible' with cast iron. Second, steel has higher heat conductivity than cast iron. Thus the P TENT OFFICE.

area of the sections are-directly exposed to the hlgh temperature. Thus'the rate ofheat sheet metal sectionaliboiler gives better .fuel

economy than a cast iron sectional boilers Sheet metal being madeby rolling down a relatively large mass of metal, isrelatively homogeneous.

'Owing to the ductility of sheet metal, it can be readily repaired by Welding. Also owing to its ductility, it does not crack under an of the conditions encountered in practicefi 'Thus a sectional boiler in-which the sections are composed of sheet metal, does not explode from these causes.

The above and other objects which will hereinafter appear are I attained by improvements embodying new and useful features as disclosed in this application.

To enable others skilledv inthe art to so have been annexed. as a part of this disclosure. 1

Fig. 1. is a longitudinal sectional view of Fig. 2 is a top plan view of the boiler with onehalf shown in section on line 22 of Fig.

1 with some parts omitted.

. Fig. 3 is a front elevation of the boiler showing doors and dampers thereon.

Fig. 4 is a. rear elevation showing doors and dampers thereon. g

Fig. 5 is a section on line 55 of Fig. 1. Figs. 6, 7, 8, 9, 10 are front elevations'respectively of the left halves of symmetrical units 1, 2, 3, 4, 5. V i Figs. 11, 12, 13, 14, 15, are sections of Figs. 6, 7, 8, 9, 10, respectively, on line 1115.

Figs. 16, 17, 18, 19, 20, are sections of Figs. 6, 7, 8, 9, 10, respectively, on line 16-2( F igs.'21, 22, 23, 24, 25, are sections of Figs. 6, 7 8, 9, 10, respectively, on line 21. -25.'-

26, 27, 28, 29, 30, are sections of Figs. 6,7, 8, 9, 10, respectively, on line 26-30.

the boiler on line 11 of Fig. 2 with some of the doors etc. omitted.

In the present embodiment, the boiler comprises a water container comprising a plurality of units or sections 1,2, 3, 4, 5, bolted together by thru rods 6, 7, 8, 9, in a usual manner. All the units while differing in details, are similarly made and therefore a detail de scription of the mode of making unit 1 will be given as illustrative. Unit 1 (Figs. 1, 2, 6, 11, 16, 21, 26) is made by pressing to shape, complementary parts-10, 11 of sheet metal, preferably steel, and integrally joining the same preferably edge to" edge along their meeting edges 12, preferably by autogenous welding such as by gas or the electric are. I findit to be especially important that those portionsv of the units which are directly adjacent the high temperature Zone shall have non-lap joints, since the poor heat conductivity across a lap joint (riveted joint for instance) will result in fire cracking. l/Vhere the thru rods 6, 7, pass thru the unit 1, nipples 13 are preferably welded at 14, 15 (Fig.

1 11) Screw collars 16 are preferably welded in place as shown to receive wash out screw plugs 17. Pressed in flanges 18 are made to take slip or screw nipples 19 to put the units in water communication with each other. A steam outlet 20 is secured by welding or otherwise, in the top of preferably each alternate unit.

The heating boiler illustrated comprises one of each of units 1, 3, 4, 5, and five of units 2 (Fig. 1). All the units are symmetrical, and therefore only half of each unit is shown in Figs. 6 to 10. Such differences in form as exist between the different units are readily seen from the drawing, and therefore only certain'of these differences will be specifically referred to. Extending across from unit 1 to unit 3' is a water grate comprising'a plurality of tubes 21-which slope upwardly from unit 1 to provide free water circulation. These tubes 21 are preferably expanded into openings in the near faces or walls 22, 23 of units 1 and 3. In line with the tubes 21 in the far faces or walls 24, 25, are secured removable screw plugs 26, 27, the walls. being vpreferably reinforced by plates 28, 29. Screw plugs 26, 27 are preferably substantially 7 larger than the size of tubes 21 in order that the tubes 21 may be passed in or out thru the openings in walls 24, 25 which are normally closed by plugs 26, 27 and so that suitable tools may be readily operated thru these openings to either secure in, or remove from, place, the tubes 21. In the rear unit 5 is an opening 30 normally closed by cover 31 (Fig. 4).

This opening is so located as to permit access to, and in line with, tubes 21, to provide for inserting or TQIDOVIHQ'tLlbQS 21 therethru and also to provide for the straight line operation of tools inserted therethru in operating 011 tubes 21.

Below the water grate is a secondary grate "2 'o tl' l t lll u mun er in soc rt seem a he (noun man.

ner; At the rear of the grate 32 is. a bafile 34 preferably of fire brick. The li res on the and'pass toward the rear thru central flue: 41.

and out at 42.

Beneath the grate32 low the combustion chamber 37 is ash Chit-III ber 44. Partition 45*separates pit-43 and Thence the. gases pass The ases )ass from the is ash pit 43 and'bef chamber 44 and supports baffle 34.; Located within ash pit'43 are two auxiliaryairpipes; 46,47 controlled respectively by dampers148a' 49 at the front of the ash pit. Pipes 46, 47,

extend through partition 45 and are connected to U-pipe 50 (Figs. 1, 5") having'a plurality of separate auxiliary air outlets-51;. Auxiliary air in passing through pipes 46,

47 is heated by the surrounding; heatp-resentf in the ash pit. Thexair then passes into pipe 50 and out openings 51. As the-top of-pipe= 50 is slightly higher than baflle 34, it is kept quite hot by the hot gases passing over'it; and thus as the air passes out of openings' 51; it is raised considerably in temperatureand:

mixes with the passing gasesto' morecom pletely burn same. The part of unit5 forming the rear of the combustion chamber ismade thinner to increase the size ofthe combustion chamber. As will be seen by'considering Figs. 1, 5, 7 9, the'combusti'on chamber 37 and ash chamber 44 directlyopen into each other.

This provides additional size,

to the combustion chamber by there being'no cross portion to units 3, 2 and 4 at this pointv similar to cross portion 52 of unit :5; Also this permits someof the light ashes carried into the combustionchamber to settl'e'into'ash' chamber 44. Also'byi regulation of damper 53, air may be admitted to the-combustion chamber to still further regulate the draft and combustion of fuel.

The inner side and top portions of thesections forming the combustion chamber and fire box, and the sides of the fines, are

angular to increase the heating area. The top and bottom 55 of the fines are preferably straight to permit of easily cleaning thefiues-i The invention may be embodied in other specific forms without departing from the spirit oressential characteristics of the invention, and the present embodiment is therefore to be considered in all respects asillustrat-ive and not restrictive, the scope of-the' invention being indicated by the appended" claims rather than by the foregoingdesc-ription, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

I claim:

1. A heating boiler comprising, two water container portions, a grate comprising a plurality of independent side by side tubes connected to the near faces of said portions, ,a

rear wall spaced from said portions, openings in the far faces of said portions and substantially in line with said tubes and normally of one section of a sectional boiler and in whichthe other water container portion is part of another section of said sectional boiler.

HORACE H. PEEK.

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