US1826411A - Tubular boiler - Google Patents

Description

Oct. 6, 1931. H. T. BELLAMY ET AL TUBULAR BOILER 5 Sheets-Sheet 1 Filed April 11. 1927 w Q Q uwm . NAN? Oct. 6, 1931. H. T. BELLAMY ET AL 1,826,411

TUBULAR BOILER Filed April 11,, 1927 5 ShetsSheet 4 'Oct. 6, 1931. T. FBE LLAMY ET AL 1,826,411

TUBULAR BOILER Filed April 11, 1927- 5 Sheets-;Sheet 5 J www- A y/W ROOM I'HERMO Patented Oct. 6, 1931 UNirEDsTATEs PATENT OFFICE HARRY ,T. .BELLAMY, or RIVER ronnsr, .ANZD JULIAN 0. SMITH, or WILMETTE,

IIZLINOIs TUBULAR BOILER Application filed April 11,

"This invention relates to a tubular boiler fora. heating systemand has special referp 5 comprises a system of coils of pipe so constructed and arranged as to obtain a rapid general circulation of the steam or hot water with a maximum exposure of the coils to the hot gases.

The present invention relates more particularly to a gas fired boiler for hot water or steam heatingsystems'wherein the boiler comprises various coil sections heated by a gas burner, which latter is located adjacent an upper coil sectionfrom which latter the steam or hot water immediately rises to the radiators, the steam or hot water in said upper coils being replaced by preheated water or steam from'the lower coil sections.

Further. to obtain the maximum heat from the heating gases,the burner is supplied with a mixture of gas and air under pressure which forces the hot gases through a tortuous path surrounding the coils and in the opposite direction tt i iat of the-flow of steam or water through the tubes. The mixture of gas and air under pressure displaces the stack draft of the usual type so that aslow draft is obtained, and therefore, an exhaustive utiliza- 1 tion of the heat in the hot gases.

It is. well known that heat is wasted by lowering the temperature in the heating gases when the latter arepermitted to expand. By providing a tortuous pathv and by directing thegases against coils disposed in a staggered relation and against baflie walls, the hot gases are maintained in asomewhat restricted state and are not permitted their maximum expansion. As aresult thereof most of the heat in the gases-is transmitted to the water 1927. -Serial No. 182,567.

obtain a maximum exposure to the hot gases.

A' further object of this invention is to provide a gas fired boiler comprising various sections of coils and wherein the burner is located adjacent to sections of the upper coils from which the steam or hot water immediately passes to, the radiators.

A still further object of this invention is to provide a gas fired boiler which is provided with a series of coils, the products of 0 combustion entering the stack after flowing through a tortuous path and contacting with said heating coils and which stack is located at or below the lowermost levels of the heating coils.

It is also an object of this invention to provide a gas fired boiler having a plurality of heating coils whereby a rapid circulation of water and steam through said coils is obtained.

Another object of this invention is to provide a gas fired boiler in which the'burner is supplied with a mixture of gas and air under pressure whereby a slow draft and, therefore, an exhaustive utilization of the heat in'the 7 5 gases of combustion'is obtained.

Other objects and advantages of this invention will be apparent from the description and drawings forming a part of this specification to which latter reference may so now be had for a more complete understanding of the characteristic features of this in vention, in which drawings:

Figure 1 is a side elevational view of a gas fired boiler showing the housing therefor in section;

'Fig. 2 is an end elevational view of Fig. 1 likewise'showing the outer casing in section;

Fig. 3 is a'topplan view of Fig. 1 showing the casing. in section;

Fig. '4 is a plan sectional view taken on the line 44 of Fig. 1;

'. Fig. 5 is a perspective view of one of the uppercoil sections;

Fig. 6 is a perspective'view of one of the lower coil sections; and

a Fig. 7' is a plan sectional view of the boiler taken on the line 77 of Fig. 1 and showing the supply and control systems therefor in side elevation. I

' Referring now more particularly to the drawings, the gas fired boiled comprises a.

plurality of upper coil sections and aplurality of lower coil sections 11 secured within .an venclosu're 12. .Theenclosure 12' preferably comprises an angle iron framework of a rectangular shape, having heat inand 14. 'The top and bottom of this en- 2e 7 angle iron frames are provided with a heat closure maybe made similar to the two side Wall members and all of these rectangular insulating material 16 which may be of asbestos or other like material.

'tangular angle iron members may be disposed on the interior of the enclosure to act as an auxiliary support for the top and side A; pair of recwalls. 7

The upper coil sections comprise a group of pipes 17 '18, 19 and 20 formed into coils,

eachof said pipes comprising alternate coils lying in a horizontal plane and intermediate coils lying in a vertical plane as shown particularly in Figs. 2 and 7. The coils of the pipes extend from the front to the rear of the boiler and each pair of adjacent pipes are so arranged that the coil or one of .the

pipes lying in a horizontal plane is disposed centrally and between the coil of the other of the pipes lying in a vertical plane. In-

this arrangement, the'various lengths of pipe lie'in' a'staggered vertical relation.

r The lower coil sections 11 comprlse a group of pipes 21, 22, 23 and 24 formedinto coils, the pipes extending from side to side of the 7. boiler and lying in planes one above the other. These coils are shown particularly in Figs l and '2 andare supported in the aforementioned relation by meansof cross supportsj25 secured to the outer rectangular angle iron framememb'er15,

The upper and lower coil sections are connected together at the rear end ofthe boiler, the lower coil 21 havingan' upwardly extend- Y-ing' portion 26 of pipe 21fwhich is connected to a downwardly extending portion 27 of" coil17by means of a union- 28. "This same connection is carried outm the various other.

7 coil sections, coil 22 being connected to coil 7 n 18,;coil 23 being 'connectedito 'coil 19 and coil w 24rbeing' connectedfto coil '20." I

V the stack 34'. ,The other ends of the . upper coil sections 17, 18,19 and 20 are connectedtoa header 29' which latteris connected to the radiators, as shown particularly in Fig. 3. Thelower'jco-il sections 21,- 22, 23 and 24 are'simi'larly con nectedat their forward ends to a header 30 which is likewise connected to the radiators. The direction of flow of the water or steam employed in the boiler is indicated by the arthe header29, the'end. walls ,The lower coil sections are disposed beneath a heat insulating partition 31 and the connections between the lower coil sections and upper coil sections are in back of a bafiie plate 31" extending from the partition 31 upwardly to a position near. the top of theenclosure 12. The burners used in this apparatus are of the usualltype and comprise a group of four pip-es 32 positioned above the partition 31and directly beneath the lowermost or discharge end of the pipes 'Of the upper coil sections. These pipes 32 are provided with'jets 33 spaced at suitable intervals'and are suitably supportedon cross braces fixed to outer rectangular frame members. The lower pipe of'each coil section or that pipe having direct association with the gas burner is provided with a battle which extends half way around the upper portion of the pipe for the purpose of confining the hot gases thereto. Thepipes areconnected at each endto headers 32?, one of said headers being connected to a source of gas suply which latter is mixed with air wherebya mixtureof gas and air under pressure is obtained. 'This gas supply system. and the control thereof will hereintubular baflies, and the gases are directed upwardly under pressure against the successive coils. These coils act similarly to bafiie plates,

the coils being in afstaggered relation, and the gases are checked in their advance and are therefore considerably retarded. It may be 'desirable'to further check the flow of the gases by providing baflle' plates on the upperipor- 'tions of all the c'oils'where asmaller and a more tortuous path is alforded to the burner gases which are 1 under pressure. After the burner gases have passed around these various coils, they are directed rearwardly and over' lldi filo

the top oftheupwardly extending bafile 31 and are then forced downwardly. in'thedirection of thedotted'arrows to the chamber in which the lower coil-sections are disposed and which chamber is provided by the heat insulating partition 31'. The gases pass through the bottom'of this chamber and out 1 The draft thus produced by the airand gas under pressure is slow, and therefore, the hot gases are in contact with'the coils for a much greater length of time thanif the draft werev rapid. Further, inasmuch as the burned semen gases are r-etardedflby reason of' the tortuous 'zpa'th through whidh they'ih'ave traveled, the

}gases:are not spermiittedto losetheiheat which and therefore, a manimunref :hieat contained in the hot :gases is transmitted to the water or steam 1n the coils;

ilit 'vwill be noted that lthe hea ting medium an thecoilsitravel in theopposite direction to theientire supply of waterinahot water lieat- I mg system fiBGdFbG heated in order to take the chill off the Troo'ms the early morning or late evening. :As a result-of this invention,

athe burners being located directly fbeneath V therwater or steam iin the cei'ls, which latter are directly associated "with the radiators, the

V wburnersneed only be operation fora cem- -;p'arati ve1y short time to heat a sufiicient amount of *waterto :take' the chill out of the room. or other enclosure to be heated and which operation will require but a minimum amount iof'time. ilt islnot necessary to heat .ian entiredrum of water or to heat the entire supply=of heatinginied i um in the heating sysitem todo this. l r

- It is apparent that rapid general circula- F'tion of the steam ior hot water in the coils 3 will be obtained because of this direct con-' nection between .a smallsupply of water and I -:a cemparaitivelygreatsupplyof burned gas.

lhe small supply of Water contained in the 'smgle coil is in direct contact with a com- '9 paratively intense fiame' and is heated-very rapidly, and therefore, passes out 0f the pipe very rapidly. By means ofthis' rapid genreral circulation ori -the water or steam, ithere .is less tendencyifor heati losses in the transmission throughout the heating system and therefiere 'a great economy in the use of fuel wand :21 great xefiectiveness inthe use of the heat is secured.

Inasmuch as the Incoming or coolest water ",stack lloss'is very low. It is pre fera bleto havethesta'ck located at the lowerniost'point burned. When air is drawn from the build sing to 'a GQIIIbllStIOD a'chamfb er, this air mustbe replaced and at is usual that the replaced air leaks in through the Windows, '-doors, etc. 3 which provides a aeooling .efleet and somewoul'dbe ilostiwere they permitted (to expand,

or steam from the radiatorsgstrikes 'the out-'1 hereinafter be described.

.zgoring :gases at their lowest temperature, the.

timesa draft in ithe roonriand are obviously very objectionable. Howeven'it maybe dezsirable :to draw :air from the outside :to a reouper'ator or air-heater, which may be adapted to be associated with :the boiler in various ways :lmown'to those skilled in the art.

Referring EIlOW :more particularly to Fig. 7 o?f=the=drawings, a detailed view of the means tier-supplying Iiuel'to'the'boiler and a control "system therefor is shown. It will be noted zthat iin order toclearlyiillustrate the devices and ithe operation thereof, the gas supply conduits 35, 36, 37 and 38 together with the -devi'ces connected 'therebetween have been rotated-through ananglecof 90 so that a side:

elevational vicwithereo'f is obtained, whereas'the boiler and its associl ted elements are shown in plan section.

Gas is admitted from any source of supply Ito a safety control valve 39 through the C0111: duit and from :thence to a pressure reducing valve 40'through-the conduit 36. The gas ithus admitted to the reducing valve 40 usually obtains a fpressure-of aboutfi to 8 inches of water pressure in domestic use although at intervals during the day more gas is used than at other periods which greatly reduces this pressure. As it is desirable to have a constant pressure in the operation of this system, the reducing valve 40 reduces the line 'pressurein this instance to about 2 inches of water pressure which pressure can invarlably be malntained. I

' The reduced gas s next permitted to iflow to the snap valve ll through conduit 87 and from thence, whensaid valve is open, through the conduits '38-and 89 to the header 82 of the burners. A gas and air mixing device 42 0t any :well known construction, is connected between the conduits 38 and 39 and receives :air under pressure from a motor driven fan 43 which in turn -is supplied with air from outside the building or other enclosure in which the apparatus is disposed. It is to be understood "that the specific means for fore-1 ing; the air is ior illustrative purposes only and that various otherwell known devices may be employed as efliciently and :beoperated in a similar manner to that which-will ever, it may be here stated that the device is controlled by means of a plunger 44 cooperating with a valve which when open permits pita quantity of gas from the conduit 3'? to flow :to the pressure chamber of the snap ,valve 41; The pressure created in the pressure chamber actuates a diaphragm to shut off the supply of gas from the conduit 37 through the lower chamber of valve ll to the conduit :88. dVhen it is desirable to permit a flow of gas to :the burners, the valve oper- .ated by the plunger 44 is closed-and the pres-' sure in the pressure chamber of the snap valve is permitted to escape through the escapement conduit 45 to be ignited by the 'burnersior a pilot. In; order to build up a pressure in the pressure chamber, the escape: ment conduit must have a smaller capacitythan the valve operated by'the plunger. 44.

' The plunger 44 is vertically reciprocated 1 I bymeansof a lever 46 to which it is, suitably secured, the lever being, in turn, actuated by means of an electrically operated device. 47'

controlled by means of a thermally controlled device such as the room thermostat 48, the two latter ldevices'being preferably connected in a circuit of relatively lowvoltage. In

' -the operation of this latter described mecha- -'nism, when the vroom for other enclosure 1n which the thermally.controlled'device48 is I positioned reaches a desired temperature, an

electrical circuit is completed through one side of'the thermal device which controls the V -mechanism in theelectrically operated device 47 for operating the lever 46 and thereby the v cal device 47 to close the valve in the pressure I jchamber wherebygas is permitted to flow to the burners. 7 a i V Inasmuch as the supply of fuel to the burners isnot constant, it is necessariy'to provide a pilot light 49 which may be suppliedwith gas directly from the source of supply or it may preferably be 'by-passed from the conduit 36. The pilot light is :positioned adja- "cent a jet at oneend 0f theheader 32 whereafter each of the successive jets 33 are ignited therefrom. Should the pilotllight be extinq guished, a thermostatically controlled switch z thereby, terminating the operation of the sys- 7 tern. -The safety control valve 39 may be of 50' positioned in close proximity thereto would operate tocause the safety valve 39 to close'and shut off the main supply of gas any well known electrically controlled type gone side .of the electrical mechanism of the valve is shown connected to one side, of the nectcd through the i of the line.

line and the other side of'the' valve is-con switch 50 to the other side In order to permit the' complete ignition boiler adjacent the burners. One side of this i switch is connected to one side of the line and" vice 47.

We claim: 7

theother'side of the switchgisconnected to the-motor of the fan 43 and thence to the other side of the line through an electrical switch 52 which latter may'preferably be of the tiltable' mercury tube contactor, type and" actuated by the electrically controlled de- When the permits a flow of gasto the burners, it also tilts themercury tube52 to vclose the electri- .cal circuit therethroughflAfter a predeter-j minedinterval, the switch 51, normally open when the supply of gas to the burnersis shut off-,is actuated into a closed position by means of the hotnga'ses from the burners andi com pletes an electrical circuit through the motor of the fan 43.- When the thermostat :48 causes theelectrically operateddev-ice47 to shut olf the supply of gas to the burner, the electrifcal circuit through the motor is simultaneously opened through the switch 52.- Thus,

glam-e115 operated devi e 47 gas is initially admitted to the burners-with out air, until a suflicient time is elapsed to warrant ,"a complete ignitioni whereafter the tion is'herein shown and described, it is to be understood that the same is not to be lim- .ited to that specific construction since various modifications may occur to those skilled in the artiwithout departing fromthe spirit andscope of; this invention, and we desire therefore that the structure be limited only by the showing of'the prior art and the scope of the appended claims;

, 1. In-a gas fired 'boilerpupper and lower coil sections connected together for circulating a heating medium, afgas burner disposed therebet'ween overan extended area of sa d boiler and-supplied with'a mixture of "gas and air, under pressure,andmeans for heat transmissioni-obtained in saidboilerl and 1t 1s believed" that a detailed showing and description 1s unnecessary. 'However,

2. Ina gasfired boiler, upper andllower ;coil'sections connected together for circulating aheatingmedium, agas burner disposed therebetweenlover an extended area of said boiler and supplied with a mixture of gas and air under pressure, said upper coil sec- 'tion comprisinga series of pipes arrangedin coil sectionsconnected together for circulatmg a heatingmedium and disposed in a substantial.ly air-tight enclosure, a gas burner ,dispos'ed between said upper and saidlower lot lit

coil sections over an extended area of said boiler and suppliedwith a mixture of gas and air under pressure, means for directing the hot gases upwardly around the upper coil section and thence downwardly around the 7 lower coil section whereby the flow of said hot gases is restricted and a maximum heat transmission is obtained in said boiler.

4. In a gas fired boiler, upper and lower coil sections connected together for circulating a heating medium and disposed in a substantially air-tight enclosure, a gas burner disposed between said upper and lower coil sections over an extended area of said boiler and supplied with a mixture of gas and air under pressure, a partition disposed between said gas burner and said lower coil section, and a stack connected to said enclosure adjacent said lower coil section, means for directing the hot gases from said burner first to said upper coil section and thence downwardly around said lower coil section and out said stack whereby said hot gases travel in a tortuous path and said coils obtain a maximum exposure thereto.

5. In a boiler, a plurality of coil sections for circulating a heating medium and having a discharge outlet at their lower ends, and

' heating means disposed adjacent the lower ends of said coil sections, each of said coil sections comprising a plurality of coils with each alternate coil lying in a vertical plane and each intermediate coil lying in a horizontal plane, each pair of adjacent coil sec- 7 tions lying so arranged that the said coils belng ina horizontal plane are disposed substantially centrally of said coils lying in a vertical plane whereby a sluggish movement of the hot gases from said burner and therefore a maximum heat transmission is obtained in the boiler.

6. In a boiler, a plurality of coil sections for circulating a heating medium and having a discharge outlet at their lower ends, and heating means disposed adjacent the lower end-s of said coil sections, each of said coil sections comprising a continuous pipe formed into coils with each alternate coil lying in a vertical plane and each intermediate coil lying in a horizontal plane, each pair of adjacent coil sections being so arranged that said coils lying in a horizontal plane are disposedsubstantially centrally of said coils lying in a vertical plane whereby a sluggish movement of the hot gases from said burner and therefore a maximum heat transmission is obtained in the boiler.

7. In a gas fired boiler, a coil section for circulating a heating medium and disposed in the upper portion'of a substantially air tight enclosure, a gas burner disposed adjacent the lower end of said coil section and supplied with a mixture of gas and air under pressure, a stack connected to the lower portion of said enclosure, a partition extending tioned partition to a point near the top of said boiler whereby the hot gases from said burner are directed upwardly over the top of said second mentioned partition and thence downwardly to said stack thus obtaining a sluggish movement of said gases.

8. In a gasfired boiler, upper and lower coil sections connected together for circulating a heating medium and disposed in a substantially air-tight enclosure, a gas burner disposed adjacent one of said coil sections over an extended area of said boiler and supplied with a mixture of gas and air under pressure, a stack connected to said enclosure adjacent the other of said coil sections, and a partition between said coil sections having a restricted opening therethrough whereby the hot gases from the burner are obstructed and a maximum heat transmission is obtained in said boiler.

In witness whereof we have hereunto subscribed our names.

HARRY T. BELLAMY. JULIAN C. SMITH.

CERTIFICATE OF CORRECTION.

Patent No. 1,826,411. Granted October 6, 1931, to

HARRY T. BELLAMY ET AL.

t is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, line 2, for the word "boiled" read boiler; line 36, for "or" read of; line 97, for "suply" read supply; page 5, lines 35 and 36, for the word "lying" read being and "being" read lying; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 15th day of December, A. D. 1931.

M. J. Moore,

(Seal) Acting Commissioner of Patents.

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