US2233553A - Steam generator - Google Patents

Description

March 4, 1941. B A PHILLPS 2,233,553

STEAM GENERATOR Filed March 8, 19258 3 Sheets-Sheet 2 March 4, 1941. B A PH|| |P5 2,233,553

STEAM GENERATOR Filed March 8, 1938 3 Sheets-Sheet 3 Patented Mar. 4, 1941 ,UNITED .STATES rare orsi@ 1 Claim.

This invention relates to new and useful improvements in steam generators.

One object of my invention is to provide a steam generator, consisting of three separate units, namely, the upper and lower lire tulbe boilers and the re box which is arranged in front of the lower boiler and may be used as an auxiliary boiler.

A further object of my invention is to provide a steam generator of the character specified, capable of generating the maximum amount of steam and heat with the minimum quantity of fuel consumption.

Another object of my invention is to provide a steam generator that is comparatively simple and economical in construction, and is also very compact and may, consequently, 'be installed in a relatively small space.

With the foregoing and other objects in view that will appear as the nature of my invention is lbetter understood, the same consists in the novel features of construction, combination and arrangement'of parts illustrated in the accom-- panying drawings and more particularly pointed out in the appended claim.

In the accompanying drawings, which are for illustrative purposes only and are therefore not drawn to scale:

Figure 1 is a side elevation of a steam Igenerator, embodying my improvements.

Figure 2 is a .central longitudinal section of the device.

Figure 3 is a front end view.

Figure 4 is a vertical transverse section, 4taken through the upper and lower .lire tube boilers.

Figure 5 is a horizontal section, taken .through the re box and Figure 6 is a front elevation -of the water heater.

Referring to the drawings vfor a more particular description of my invention, and in which drawings like parts are designated by like reference characters throughout the several views, A designates the fire box, which may also be used as an auxiliary boiler and `B and C the upper and lower lire tube lboilers, respectively.

The lower re tube boiler C is supported at the front on the longitudinally disposed brick walls l, by the outwardly extending heads of anges 2. The rear ends of the upper and lower boilers extend through the vertical plate 3 and are fastened in place by the radial 'lugs or ears 4. The plate 3 is provided with the oval casing 5, which surrounds the rear ends of the boilers B and C, and this casing is equipped with the upper and lower circular doors 6 and 1, respectively, to facilitate repairs or permit the ready removal of the fire tubes 8 and 9, if necessary.

The nre box A is mounted on the floor a suitalble distance in front of the lower boiler C. This unit is preferably constructed entirely of steel welded at all joints, and comprises the inner and outer walls Ill and Il, spaced apart at the ends, front and back for the purpose of allowing a free Acirculation of water around the inner wall 10 as a protection against the heat of the rire box. This space remains filled with water at all times while the generator is in operation and being situated much lower than the upper boiler B, all steam generated in this space will pass via the steam pipel l2 to the top of the boiler B. The pipe l2 is connected to the pipe i3, which leads from the bottom of the water lire box tothe steam chamber of the upper boiler. The nrebox A is divided into the upper and lower com- 20 bustion chambers Ill and l5 by the hollow water tube grates I6, which are inclined upwardly and rearwardly to allow any steam generated therein to escape; this overcomes the usual pounding and cracking noise when iirst starting a nre. 20 The water tube grates i6 are securely welded at opposite ends to the inner wall l0 at the front and back of the fire boX. The opening I8 through the upper or top water space is designed as a n sight opening and to facilitate any repairs that "0 may be needed to the inside of the upper combustion chamber I4. The grate bars lil of the lower combustion chamber l5 are preferably made of solidcast iron. The fire box may be easily removed to facilitate repairs to the front end of the -boiler C, by disconnecting the steam and water supply pipes. The ash pit 2Q of the fire box A extends Ibelow the floor level and is of sufficient depth to hold several days aceurnulation of ashes. The front end of the ash pit is 40 provided with the hinged lid 2l. which may be readily raised to permit the removal, of the ashes. The lid 2l is provided with an opening (22 covered by a sliding check.

The water heater.2.3 is placed beneath the boiler C in position to receive the hot gasses of combustion from the lower grate lil, and also acts as a barrier to prevent the ashes Vfrom work,- ing back under said boiler. A water supply pipe 5o 24 is Aconnected to one end of the water heater and a new or hot water pipe .25 extends from the opposite end thereof. By removing the pipes 24 and 25, the water heater may be easily removed.

The boilers B and C are connected together by the flange couplings 26 and 21, whereby water circulating means is afforded from one boiler to another. The lower boiler C is completely filled with fire tubes 9, while the upper boiler B is not completely filled with re tubes, but has a steam space 28 at the top. The lower boiler C is heated first and would ordinarily heat up much faster than the upper boiler B, but I have compensated lfor this :by extending the circulating pipe 29 from the bottom of the boiler C to the bottom of boiler B. By this arrangement, the hot water from boiler C canv pass up into boiler B through the couplings 26 and 21, thus forcing the cooler water from the boiler B down to the bottom of the boiler C through the circulating pipe 29.

The purpose of placing the boilers B and C one albove the other, is to provide a long travel for` the hot gasses of combustion, which are distributed over a large heating surface in as small a space as possible. By this arrangement the stack temperature is reduced to nearly the temperature of the water in the boiler, notwithstanding the fact that the perfect combustion of the fuelv by the down draft through the bed of live fcoals creates an intense heat.

The vdraft space 3i) formed between the re box A and the front end of the lower boiler C, is ycovered by a heat resisting cement that forms an arch 3|. This arch rests on the upper side of the boiler C and the brick walls I, is easily applied and forms a very tight leak proof joint. A

direct draft opening 32 passes through this arch and connects with the draft passage 33, allow- 33 and may be easily removed if necessary, to

repair the fire tubes 8 or other parts. This plate has an opening 31 covered by a door 38 that can be used as a check draft and also in cleaning out the passage 33.

In starting a fire, the entirel surface of the water tube grates I6 of the combustion chamber I4 are first covered with fuel. Ki'ndling is then placed on the coal and ignited. The Idraft is` drawn in through the opening 39 of the fuel door 4D and enters the fuel bed with a downward movement, causing the kindling to ignite the fuel beneath. The draft continues down-` wardly and enters the second Acombustion cham-` -ber I5, and passes out of this chamber through der bed of the grate I9 and out through the passage 4I. Both the upper and lower drafts icome together and pass beneath and also through the fire tubes 9 of boiler C to draft passage 42. The draft under the boiler C passes over the water heater 23 and enters the passage 42 through the opening 43 in the steel supporting plate 3, continuing up through this passage and entering the fire tubes 8 from the rear end of the boiler B. This draft then enters passage 33 and passes via the outlet 34 to the chimney.

Among the many advantages derived through the use of my invention, some of the more important may be Ibrieily enumerated as follows:

First-The device consists o-f three separate units, namely, the fire box and the upper and lower fire tube boilers.

Second-The upper fire tube boiler being mounted above the lower boiler gives a long fire travel through the fire tubes, while occupying 'only a small space.

Third-The upper boiler receives all of the steam generated in the lower boiler by passing through the flange pipe couplings.

Fourth-The upper boiler receives its water supply Aentirely from the lower boiler.

Fifth-The upper boiler receives all of th steam generated in the lire box unit.

Sixth-The upper boiler receives the heat that is left after passing under and through the lower boiler, since a reversed forward movement of the draft is necessary to reach the chimney.

Seventh-The lower [boiler is completely filled with fire tubes and water, and hence, no space is allowed for steam above the tubes.

Eighth-The fire box unit and the lower boiler are built separately and secured together when installing, making it much easier to handle the several units and easy to get around and through small openings.

Ninth-The boiler has a direct draft which makes it possible to start a quick fire, when otherwise the draft would be poor.

Tenth-My present boiler construction may.

nection with the drawings, it ls thought thatk the construction, operation and advantages of my invention will be readily understood, without vrequiring a more extended explanation.

Various changes in the form, proportions and minor details of construction may be resorted to without departing from the principles or sacrificing any of the advantages of myinvention, as defined in the appended claim.

Having described my invention, what I claim as new and desire to secure Iby Letters Patent, is:

A steam generator comprising upper and lower fire tube boilers, madein separate units and connected together by tubular pipe couplings,` a separate fire box unit situated in front of the lower boiler and comprising upper and lower combustion chambers, means for creating down and up drafts through the upper and lower combustion chambers, respectively, means for causing a reversed forward movement of the hot gasses of combustion through the upper boiler after passing under and through the lower boiler, a vertical plate having a draft opening and openings to receivethe rear ends of the upper and lower boilers, an oval casing carried by said plate and a cover plate for the casing, said vertical plate, oval casing and cover plate forming a vertical passage or compartment at the rear ends ofthe boilers.

BRACE -ALDEN PHILLIPS.

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