US1360980A - Return tubular boiler - Google Patents

Description

` ERNEST VON DER LIPPE.

RETURN TUBULAR BOILER. APPLICATION FILED Nov. 4, 191s.

Patented Nov. 30, 1920.

2 SHEETS--SHEET I- INVENTOR:

I BY '//v l M/ ATTORNEY A EOefkyano/ef aff/1% ERNEST VON DER LIPPE.

RETURN TUBULAR BOILER.

APPLICATION FILED NOV. 4, 1916.

Patented Nov. 30

2 SHEETS-SHEE I N VEN TOR Lw EknBf van Je',

ATTORNEY.. I

UNITED STATES PATENT OFFICE.

lERNES'J? VON DER LIPPE, OF CHICAGO, .'VILLINOIS.

RETURN TUBULAR BOILER.

Specification of Letters Patent. Patnted 'NV 30, 1920 Application led November 4, 1916. Serial No. 129,432.

To all whom. t may concern:

Be it known that I, ERNEST voN DER LIPPE, citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have. invented certain new and useful improvements in Return Tubular Boilers; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

ln its general aspects, my invention relates to fluid-heating appliances of the general class including boilers, hot water heaters and hot air furnaces, its general aims being to .produce a simple, compact and easily controlled heating appliance which will be unusually eilhcient and which will be practically smokeless even with cheap grades of fuel. For this purpose, my invention aims to produce a heating appliance which will permit of a quick starting of the chimney draft, which will utilize the waste heat of the combustion gases for heating the air supply of the lire box, which will enable this heated air supply to be used effectively both above and below the grate, and in which both the chimney or smoke pipe connections and the air supply may be elfectively and simultaneously controlled. More particularly, my invention aims to provide a heating appliance of the class described having upwardly directed tubes. leading from the lirebox to a combustion chamber, and also having auxiliary tubes extending downwardly from the combustion chamber and connected toa smoke pipe, to provide means for shunting vthese auxiliary tubes while the fire is being started or forced, to utilize the heat of the gases after leaving the auxiliary tubes for heating the air supply of the firebox, to provide means for conveying this preheated air supply to desirable entrance points located both above and below the grate, and means for simultaneously controlling the air supply connections of the ash-pit with both the preheating chamber and the outer air; and to provide a construction which vwill readily enable the baffle-plate or smoke-plate and the hot air supply tubes to be replaced. Further objects will appear hereafter.`

While my invention may be employed advantageously with boilers and hot air furnaces of widely varying types, it is particularly adapted for use in connection with a opposite sides of a partition 6 which extends vvertically downward from the lowerfr plate shown in the diagram of Fig. 4, thus shuthouse-warming appliance andis shown in such an embodiment in the accompanying drawings, in Which- Figure 1 isa central vertical section through a boiler embodying my invention.

Fig. 2 is a horizontal section, taken along the line 22 of Fig. 1.

Fig. 3 is a fragmentary horizontal section, taken along the line `3 3 of Fig. 1.

Fig. 4 is a vertical diagrammatic view corresponding to Fig. 1 and alsofshowing the simultaneously operable dampers controlling the connections to the smoke pipe and the air supply.

In the drawings, an outer cylindrical shell 1 houses an upper plate 2 and a lower plate 3 connected by vertical tubes 4 and 5, these tubes being disposed respectively on and which partition forms a bac-k for both the i'irebox 7 and the ash-pit 8. All of the said tubes open at the top into a combustion chamber 9 which is connected to the smoke pipe 10 by a flue 11 controlled by a damper 12. The lower ends of the rear tubes 5 lead to a Vsmoke chamber 13 which is connected to the smoke pipe 1() by a flue 14 controlled by a damper 15. This smoke chamber is separated by an inclined smoke-plate or baffle plate 16 from the air-preheating chamber 2G which adjoins the partition 6, the plate 16 being preferably madeof a good conductor of heat, such as iron. The upper part of the partition 6 has a number of perforations, each of which preferably leads to la short tube 17 projecting into the fire-box and adapted to have the rear end of an airinlet tube 23slipped over it. Below the grate 1S, the partition 6, may also have an opening 19 controlled by va door 20 and connecting the ashpit 8 with the air-preheating chamber 26. Other doors 21 and 22 control openings leading from the outer air to` the air-preheating chamber 26 and the ashpit respectively, and both of these doors may v advantageously be controlled simultaneously with the dampers 12 and 15 by means of a suitable connecting mechanism, such as the belt 24: shown in the diagram of Fig. 4.

In starting the heating appliance of the drawings, the various doors and dampers are turned at right angles to the position ting oli both the lower smoke pipe connection and the air inlet 21. The air supply then enters through the opening 22 of the ashpit and passes through the grate 18, while the Vsmoke and other products of combustion pass upward through the tubes 4 into the combustion chamber 9 Aand thence through the flue 11to theA smoke pipe 10, soV

that there is a quite direct passage from the outei' Yair to the chimney.V` When the fire is well started, thereby also warming the chimney and starting astrong draft in the latter, the closure elements are moved to the position shown in Fig. 4. This change closes the direct air-inlet 22 to the yfirebox, but

opens the rear air inlet' 21, Vso that the air mustV pass'tlirough the preheating chamber 26 before it can reach the fuel either through the ashpit or through the tubes 231 Likewise, this Vchange closes the direct lconnection from the combustion chamber to the chimney, but opensthe connection through tlie flue 14 to the lower end of the smoke pipe, so'that the gases in the' combustion.

' chamber can reach the smoke pipe by first passing through the return tubes 5, after which they impinge more or less against the baffle plate 1G, thus conveying Ysome of their Y heat to the air in the preheating chamber.

By manipulating the intermediate door 20, the proportion of air supplied respectively above and below the grate may be varied according to the nature and' quantity of the lfuel, and in any case the supplying of previoiisly heated Vair above the grate through [the tubes 23 (which tubes preferably have theirfree ends bent downwardly as shownV Y in Fig. 1) makes( it easy to secure practically smokeless combustion even when using a cheap grade-of fuel. Besides, the warming of the air supply by conduction both from the baffie plate and from the partition 6 permits of a saving in fuel, so that the heating V'z ipi'iliance ofV Vmy invention permits of both smokeless and economical operation with ver f little attention.

I owever, while I have shown an embodia vertical partition and having a body of water 28 as the fluid heated by thertubesi Vand 5, VI do not wish to be limitedto these or other details ofthe construction and arrangement herein disclosed, it being-obvious that the same might be modified in Vmany ways without departing from the spirit of my inventioni Thus, it willbe evident that the relative size and number of the tubes in these ducts Ll:Y and-5 nia-y be varied considerably, as long as these tubes with the 'connecting chamber 9 forma bifurcatedpassage inV below the boiler and each having some of theY Y said tubes opening into the said fire box and -inent Vhavingtwo air tubes 23 supported by rear chamber respectively, a vertical partition between the fire-box` and the rear chamber, an upper chamber connected to the upper ends of all flues, a chimney connected both tothe'upper chamber and to the rear chamber, a 'heat-'conducting partition extending acrossY the rear chamber, flue coiinections to the chimney, anV air intake for the portion, of thev rear chamber below the last named partition, and an air duct conchan'iber with the fire-box and opening above the grate in the latter. Y' l Y f Signed at Chicago, Illinois, November f 2nd, 1916. y Y

Y Y ERNEST VO'N DER LIPPE.-V

V necting the last named portion of vthe rear

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