US1646491A - Feed-water heater - Google Patents

Description

FEED WATER HEATER Filed July 5. 1925 '5 Sheets-heet 3 Osta 259 I YW. W.

man WATER-HEATER Filed July s. 1925 5 Sheets-Sheet 4 W. PHILLBP@ FEED WATER HEATER Filed. July 5. 1925 5 Sheetswshcfzet Patented @ich 35i, 19%?.

'WALTER W. QHLLEFS, 0F PHILADELPHIA, PENNSYLVM.

FEEDeWATER HEATER.

application ined .muy t," ma. -V seen No. eraser.

My invention rela-tes. to new and useful improvements in a feed Water heater, which is particularly adapted for use in marine boilers although not especially conned theretoand has for its' primary object the provision of means toloodthe heater in case the regular circulation of water therethrough should cease from any cause Whatever.

Another object ofthe invention is to pro- ]0 vide a feed water heater for installation in the llame course of a fire tube boiler having flood line connections with the water space to automatically fill the heater with Water from the boiler should the ordinary circulation through said heater be shut olf.

Av further object of this invention is to provide unique means for supporting the heater within theflame path and more particularly Within the combustion chamber.

lWith these endsin View, this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated' by the claims.

In order that those skilled in the art to which this inventionappertains, may understand how to make and use the same, I will describe its construction in detail, referring by numerals to the accompanying drawings forming a part of this application, which Fig. 1 is a sectional end view of a boiler, of the Scotch type, illustrating the use of my improved automatic feed water heater there- Fig'. 2 is a sectional side elevation thereof.

Fig. 3 is a fragmentary sectional plan View of the same.

Fig. 4 is a fragmentary front elevation of the boilerlshowing the relative positions of the flood llines used with this type of heater.

Fig. 5 is an enlarged fragmentary sectional view illustrating the details of construction of,` one of the headers or manifolds and its mode of 'connection with the boiler.

Fig. 6 is an enlarged sectional side eleva- Fig 11 is a fragmentary sectional plan view. thereof.

Fig. 12 is an enlarged sectional. view of the connectingpipe at the line 12-12 of Fig. 11. lm carrying outl my invention as embodied 1n Figs. 1 to 8 inclusive, 2 represents a ina-.- rine or fire tube boiler of the Scotch type having one or more furnaces 3 leading to the combustion chamber flfromuwhich lead the return tubes 5 and having a water space about the furnaces, return tubes and the com.-I

bustion chambers.

vWithin the combustion chamber is located thefeed Water heater represented' as a Whole by the numeral 6. This heater preferably comprises two headers or manifolds 7 and 8 each having an opening 9 one of which acts as an inlet .and the other as an outlet duringlv operation, but both acting as inlets for the flood Water should circulation cease at any time. The interiors of these headers or manifolds are divided into a plurality of chambers here shown as two in number and denoted by the reference numerals 10 and v l1, said chambers being separated from each other by bailles- 12. Between the headers or manifolds are arranged a plurality of 4tubes 13 all of which are securedin place by rolling a flange or bead 14 on the ends thereof within the headers, as plainly shown in Fig. 5, and in `the walls of4 the headers directly opposite the lWalls through which the tubes .pass and directly opposite said, tubes are formed a plurality of access holes 15 each normally closed by `a screw threaded plu 16 which may be readily removed for rol ing the flange or bead on the tubes or to permit the insertion of a tool for cutting away said anges in order that all or any one of the tubes may be removed for replacement purposes.l

In the holes 9 in each of the headers are i threaded the pipes 17 and 18 the former acting as the inlet orv intake pipe from a pump or other equivalent means While the latter acts as the outlet from the heaters and forms a communication with the boiler inlet pipe 18', Fig. 1. These pipes pass through the two adjacent Walls of the boiler und combus- .tion chamber as plainly shown in Fig. 5 and are supported on the outside of the boiler by suitable brackets 19.v As shown in Figs. 6, 7 and 8, each bracket comprises a body member 20 having an arcuate channel 21 to fit about a pipe with outwardly proin a horizontal line with said inlet pipe or` jecting flanges 22 and a depending lug 23 having a hole 24 therethrough for the pas-l sage of a bolt 25, preferably a stud, which has threaded connection with the end wall 'of the boiler. Coacting with the body memoverlie the flanges 22 of the body member andthrough these flanges pass suitable securing means 29 such as bolts or their equivalent.

Surrounding each of the pipes 17 and 18 preferablyy concentric`- therewith and bridging the space between the endv wall of the boiler and the ladjacent wall of the combustion chamber is a casing 30 the'ends of which are fixed in the walls of'the boiler and combustion chamber as by rolling flanges on the ends of said \casing or in any other suitable manner to provide a secure joint. The space between the casing 30 and the pipe which it surrounds is filled with asbestos 31 or other suitable-equivalent heat resisting packing.

To the inlet pipe 17is connected a flood line 3 2 which enters the boiler below the normal water level therein and preferably with 'the point of entrance of said inlet pipe through the boiler to the heater, thus `forming a communication between the Water compartment of the. boiler and the inlet pipe to the heater. In this flood line 1s located a check valve 33 herein conventionally shbwn since the details of construction of such valves are well lknown and any of those on the market may be used. This check' valve is adapted to remain closed so long as the necessary pressure is maintained to cause a circulation of feed Water through the heater but will open as soon as such pressure is reduced so as to permit water from the boiler 'to dow directly into the intake and then into the heater. ln order to close the flood line, as for instance when repairsare to be made or whenthe device is not in use, I prefer to insert a shut oil' valve 34 in said liood line, such valve being` also .conven-` tionally shown as any standard valve may be used.

Connected with the outlet pipe 18 is another flood `line 35 similar in all details to the one above described and forming a communication with `the water compartmentof the'boiler and said outlet` pipe 18 is preferaloly arranged in a horizontal line to the point of passage of the outlet pipe through the boiler end wall. This flood line also includes a check valve 36 and a shut .oil valve 37 actuating in the same mannerV and for the same purposes as described with relation to the valves and 3d.

From the foregoing description it VBwill be seen that when the 'feed Water is properly Leaaeai circulating it will pass through the intake pipe 17 into the smaller compartment 10 of the header or' manifold', then through the tubes 13 connected with said compartment into the larger Acompartment of the header to the water conipartnientof the boiler at relatively high temperature.

if, for any cause whatever, the circulation of the feed water should cease the pressure holding the check valves 33 and 36 in a closed position will be eliminated and the pressure of the water inthe boiler will cause said `check valves to opensc that this water will low 'through the flood lilies thence through the pipes 17 and 18 into the heater so that it will be lilled with water and will not burn out and as soon as this water becomes heated a circulation will be set up through the flood lines, the inlet and outlet pipes so as to maintain the heater at a temperature sufliciently low to prevent damage thereto. Should the flood line, or any part thereof, become damaged at any time the rshut olf valves 34 and 3'? may be closed and the circulation through the pipes 17 and 18 being stopped the necessary repairs may be readily made.

As the inlet and outlet pipes 17 and 18 respectively are not fixed to the boiler or combustion chamber said pipes may expand and contract without injury to the parts and the liller 3l will ect as an effective packing to prevent the escape of products ofcombastion.

ln Figs. 9 to 12 inclusive, have shown a slightly modified form of my invention which is particularly adapted for use `with that type known as Legg boilers wherein two heater units are employed to give substantially the same heating surface asin the form above described while providing structural units small enough tote inserted through the man-hole.

ln this form of the invention Ll0 represente the boiler provided with a combustion chamber 41 access to which is obtained lthrough a manhole e2 between adjacent end walls of the boiler and combustion chamber.

ln 'the combustion chamber is located the heater 43 comprising a luralit units;`

here shown as two in num er', an represented hy 'the reference numerals lll and 45. Each unit comprises two headers or manifolds d6 and 47 to `which are attach-ed the tubes'48 in the saine manner as described with relation to the single unitheater and access to the ends of said tuhes ie obtained noemer through holes in the headers which arenormally closed by the screw plugs 49. up-M per headers of the units are in communicationor connected by a pipe flfhavinglright and left hand| threads with an intermediate `polygonal wrench hold 1 whereby said pipel may be screwed `in place and said upper headers are divided into two compartments by a baflie 52. v

- To one of the upper'headers of one of the units, as 44, is connected ank inlet pipe 53 so` that the circulation ofwater w1ll=pass .through said inlet pipe into one of the com-V partments of the upper header, then 'through the tubes communicating with said compartment to the lower header of said un1t,'then through the other tubes of the same unit to the other compartment of the upper` header,V then through thepipe 50 to the upper header of the other unit'through which it circulates in the same manner as-above described and thence through the outlet pipe 54 connected with the last named unit to the water compartment ofthe boiler. The inlet and outlet pipes 53 and 54 respectively are mounted in the same manner as described relative to lthat form' illustrated in Fig. 1 and are preferably both connected with the upper headers of their respective heater `units and are therefore on aA substantially horizontal straight line'. To the water compartment of` the boiler below the normal water level and to the inlet z and outlet pipes are connected separateflood" lines 55 and 5 6 whic 'are identical lin all details v tothe flo'od.v ines before described. Said flood lines .enter the water v compartment of the boiler in the same horizontal line as the `outlet pipes.

. 'In ca se thev feed ywater circulation` should cease and the pressure onone vside of the check valves thus be relieved the pressure 'of the 'boiler Water will open said check Ivalves and permit said boiler water to flood each o f the heater units so as to prevent the parts of the heater from being damaged by the .heat of thev fire lin the boiler furnace.

Of course I do not wish to be limited to the exact' details of construction as herein shown as these may be varied within the lim its of the fappended' claims without departing from the kspirit of myl invention.

Having thus fully described my invention, what I claim as new and useful is:

1. The; combination with a boiler includ-y ing a combustion chamber and the-surrounding water compartment, of a heater located within" the combustion chamber and having communicating chambers of different capacities, an inlet pipe leading from a source of feed water supply to one'chamber7 of the heater, an outlet pipeleadin from' another'v chamber of said heater to tewater comage to said heater 'due to heat in the combust-ion chamber. 2. A device of the character described lcomprising, in combination, a boiler having a combustion chamber and a. surroundingwater compartment, a feed water heater within the combustion chamber,and'having serially connected chambers of different capacities, the smaller oneslof which have ports ltherein, a feed watery circulating system' in,- 'cludmg ipes communicating with thesmaller cham ers of the heater through said ports thereof, a pipe connected to v each of.v the above mentioned pipes of the circulating system and forming; communication with the water compartment of the boiler below the vnormal lowr water level, and check valves in the last 'mentioned pipes so positioned asto be held closed by predetermined pressure of the water ini the eater and adapted to be opened upon diminution of said water pres-` sure whereby water will How directly from the boiler into the circulating system adjacent the .feed water heater. l

In testimony whereof, I have hereunto .aiiixed my signature.

WALTER W. PHILLIPS.

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