US2387391A - Steam boiler - Google Patents

Description

Oct. 23, 1945. G. H. 'GREEN STEAM BOILER Filed June 10, 1944 ATTORNEY Patented Oct. 23, 1945 u y UNITED- STATE aasaaei@ STEAM BorLEn George H. Green, Oakland, Calif. Application June 10, 1944, Serial No. 539,712 (ci. 122-41) p 1 claim. This invention relates to steam boilers.

f Itis the principal object of the present invention to provide an improved and simplified steam boiler `of the flash boiler type which is highly eflicient and which may be built relatively small in size so that it may be employed in the automotive and aircraft fields in connection With comparatively small steam engines.

One form which my invention may assume is y exemplified in the following description and illustrated by way of example in the following drawing, in which:

The figure is a View in central vertical section through a boiler embodying the preferred form of my invention.

Referring more particularly to the accompanying drawing, I have there illustrated a steam generating boiler I of the fiash boiler type. This boiler is intended for use in connection with steam automotive and aircraft engines and consequently is capable of being built relatively small in size with rapid generating characteristics.

The boiler comprisesa spherical dome II en- `closed within a heat insulating casing I2. The

the dome II and the casing I2 to the stack. This will effect a passage of the heated gases over the exterior surface of the entire upper half of the f dome and effect an exchange of heat therebetween.

In its upper end the dome II is fitted with a steam. outlet fitting I6 having a connection Il for conducting steam to the point of use. The

fitting IB is also fitted with a safety valve I8 for obvious reasons.

'I'he lower end ofthe casing I2 includes a combustion pot I9 which is fitted with fuel burners and air controls 2l. Obviously, any suitable means may be provided for generating heat within the casing I2 and that shown isby way of example only.

For generating steam, I provide a plurality of steam generating coils 22 which are arranged exteriorly over the lower half of the dome II. The

coils 22 are formed to conform to the shape of the dome so that the latter nests therein at a spaced distance therefrom as shown.A Each coil comprises three turns of tubing connected at one end to a feed water manifold 23 and at the other end to a steam manifold 24. The feed water manifold is connected to a feed water pipe 25 extending centrally and upwardly into the casing I2 as illustrated.

The steam manifold 24 is connected with a nozzle 26 extending into the dome II, The nozzle 26 is tted with a check valve 2I to permit steam to enter the dome but not discharge therefrom.

In operation of the boiler it is constructed and assembled substantially as illustrated and described and the feed water pipe 25 is connected with a feed water tank. As in standard practice, a feed water pump will naturally be associated with the feed water pipe 25 to feed water thereto at the proper rate. The connection I1 is connected With the engine or othermedium employing the steam generated in the boiler. It should be pointed out here that the present boiler is a comparatively small boiler and its principal use is in the aircraft and automotive field. Eor this purpose the casing I2 may be provided w1th suitable means for mounting the boiler in an automotive frame or otherwise. In that this mounting does not form a part of the invention,

it is notillustrated.

To commence the boiler in operation, combustion is effected in the combustion pot I9 by ignition of the fuel injected by the burners 20. These burners may be upwardly directed in a sort of tangential fashion somewhat as illustrated so as to obtain the maximum efficiency from the heat generated. As the steam is generated in the coils 22, the steam will pass into the steam manifold 24 and be injected into the dome II. The steam may be withdrawn from the dome from the take o fitting4 I6 through the connection Il. If the steam pressure Within the dome becomes excessive, the automatic safety valve I8 will naturally open until the pressure is reduced toa predetermined pressure.

The heated gases generated Within the lower end of the casing I2 will be caused by the formation. of that casing to pass upwardly around the coils 22 to effect an exchange of heat therewith. Thereafter these gases will pass through the thin semi-spherical chamber I4 in close contact with the `upper half of the dome II and effect an ex- .change of heat therewith. From the chamber I4 the gases will discharge through the stack I5. By the construction and formation of the dome, the generating coils 22 and the casing I2 a maximum exchange of heat will be effected so that the art Without; departing from, the spirit. of the invention as c iened inthe appended claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

A steam boiler of the character described comv' prisng a spherical dome, a plurality of separate l5 generating coils surrounding the `lower portion l of the dome, said coils being Wound about the vertical axis of the dome and surrounding the lower half of the dome, said coils conforming to the contour of the dome and lying in close proximity thereto, a feed water manifold to which one end of each coil is connected, steam manifold to which the other end of each coil is connected, said steam manifold being in communication With the interior of the dome, a casing enclosing the dome and coils, means. for generating heat'within the casing beneath the dome, said casing being so formed interiorly that the products of combustion will pass over the entire exterior area of the dome.

.t n GEORGE H. GREEN.

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