US 2627252 A
Description (OCR text may contain errors)
Feb.3, 1953 H. L. Mol-IN 2,627,252
WATER HEATER ASSEMBLY Filed Aug. 18, 1949 5 Sheets-Sheet l 30 a/ .erf/4M 0R H07 WATER OUTLET fju.
INVENTOR. Heeey L. M0727? ATTURWK ....M 2 2, 7 m m. Y. S TW E y man 1 N 2 .t V, R IM S f U ...M N V. B e B m H N S H s r A O R M E s T L m H H R E T A l W lll mw l I I 9 1 Rw. 9 l I I l l I I I l 1. E 7 u 3 A b. ,w e L Fv m Feb. 3, 1953 H. MoHN WATER HEATER ASSEMBLY 5 Sheets-Sheet 5 Filed Aug. 18, 1949 .f IIIL:
@E -11,@Tl J,
I N VEN TOR. Hem] L. Mama ATTOR NEY Feb. 3, 1953 H. L. MoHN 2,627,252
WATER HEATER ASSEMBLY Filed Aug. 18, 1949 5 Sheecs--Sheerl 4 IN V EN TOR.
breng L. M0717? Patented Feb. 3, 1953 WATER HEATER ASSEMBLY Henry Leroy Mohn, York, Pa., assignor to York- Shipley, Inc., York, Pa., a corporation of Dela- Ware Applicaties August 1s, 1949, serial No. 110,931
This invention relates to heating systems andv more particularly to an improved heating boiler and domestic hot water heating unit` Conventional water heating units and steam generators have been provided with water tubes and tanks, and with fiue passages for hot combustion products extending through the tanks and between the tanks and the boiler casing. Such prior constructions generally include the use of multiple flue passages diicult to clean and the use of external stabilizer tubes or loop.
The heating unit of the present invention provides an eflicient and economical assembly having many advantages.
It is an object of this invention to provide a water heating boiler and burner assembly which may be completely contained within a single housing, and which provides for heating water or for generating steam, and also provides for heating domestic hot water.
It is another object of this invention to provide a tubeless boiler assembly of relatively high efciency and devoid of external stabilizer pipes or connections.
It is another object of this invention to provide an improved boiler unit including a fuel burner mechanism, circulating pump and draft -connections all within a simple housing.
It is another object of this invention to provide a tubeless boiler assembly having an improved balie arrangement facilitating cleaning of the flue passages therein.
It is another object of this invention to provide a boiler assembly having an improved arrangement of iiue passages and enclosing housing which assures quiet operation of the heating unit.
It is a further object of this invention to provide an improved heating boiler and burner assembly which may be manufactured as a packaged unit, and which is easily installed'and connected to residential or other heating systems.
Other objects and advantages of this invention will be readily apparent from the following 'description and the accompanying drawings illus- 'trating a preferred embodiment of the invention, wherein,
Figure l is a vertical sectional view of a preferred form of boiler assembly removed from its .housing and taken on line I--I of Figures 2 and 3.
Figure 2 is an elevational view of the boiler assembly shown in Figure 1.
Figure 3 is a plan view of the top of the boiler assembly shown in Fig-ure 2.
Figure 4 is a front elevation View of the outer housing for the .boiler assembly shown in AFigure 2 1 with the position of the boiler and fuel burner indicated in dotted lines.
Figure 5 is a plan view, partly cut away, of the top of the housing shown in Figure 4.
Figure 6 is a plan view, partly cut away, of the top of the housing when the boiler assembly is provided with a water circulating pump.
Referring to the drawings, particularly Figure l, the heat exchanger unit includes a tubular upright casing I5 supported above a base plate II by an annular member I2. The tubular casing Ill forms an annular water wall or jacket closed at the bottom by a ring I3 and closed at the top by a ring Iii. The water wall jacket II) may be fabricated from sheet steelA sections suitably joined together and to the rings I3 and I4 by welding. Within the member I2 and on the base plate Ii is a high temperature cement base I 5 supporting a replaceable combustion chamber formed by blocks I6 of refractory material. Vermiculite nll lI may be provided as heat insulation between the combustion chamber and the member I2. An opening I8 is provided through the member I2, fill I1 and combustion chamber wall I6 to receive the combustion tube (not shown) of a conventional cil burner device. The water jacket I0 is also provided with an observation and cleanout opening I9 closed by a plate 20.
Supported within the upper portion of the water jacket I0 and extending above the top of the jacket is a water tank 22. The tank 22 is connected to the annular jacket I0 by a connecting nipple 23 and also by a circulation tube 24, the latter extending from the bottom of the tank 22 downwardly and then laterally into the water jacket I0 about midway of the height of the jacket In. An annular casing member 25 extends above the top of the jacket Ill spaced from the cuter surface of the upper portion of tank 22 and closed at the top of the assembly by a circular cover plate 26 which may also serve as a cover for the tank 22. A stabilizer connection 2T, similar to a Hartford loop, extends from the upper portion of the tank 22 outward and then downward through the ring I4 into the water jacket IIl adjacent the return line connection .28.. The stabilizer conduit 21 is within the fiue space enclosed by the casing member 25. The tank 22, member 25, and top 26 may be formed from sheet steel with welded joints. A tankless type domestic hot water heating coil 29 is immersed in the water contained in tank 22, and is provided with inlet and outlet connections 30 extending through the top 26. The top 26 is also provided withan outlet connection 3i from which steam may be led to conventional radiators, heating panels, or other devices. A drain or return connection 32 may be provided at the bottom of the water jacket iii.
The annular space between the tank 22 and the upperportion of water jacket I and member 25 constitutes a flue or passage for the combustion gases, and is provided with horizontal and vertical baffles which cause the gases to travel around j f the tank in a counter-clockwise spiral Apath to a tangential flue outlet 35, shown in Figures 2 and 3. The bafe members show-n in Figures 1 and 3 include a horizontal baille 36 removably supported on angle irons secured to the inner wall of jacket lil and extending between the bottom .of tank 22 and the inner surface of water jacket i0. A vertical baile 3l is provided extending from one end of baffle 35 upwards between the outer surface of tank 22 andthe inner surface of theupper portion of water jacket lo. A second horizontal baille member t8 extends from the top of baffle 3i around the -tank 22 tothe lower vend of a second vertical baille 39,. The baille 33 Yextends upward from the end of baille 33 lto the top plate 25 adjacent the draft outlet conduit 35. The draft outlet 3E extends tangentially from the member 25, and is provided with a draft yadjuster opening lo having a conventional automatic flap valve di mounted therein. vThe hot gaseous products of combustion pass upwardly .from combustion chamber I6 into space A, and thence counter-clockwise over the baffle'35 to the vertical bailile 3l which directs them upward to lspace B. in space B, the Vhot gases again ktravel counterclockwise .over the baffle 38 to -the vertical baille e9 which directs them into the ltangentialoutlet 35 to a conventional stack. The `inlet valve 4| admits additional air into the outlet 35 -toperrnit control of the stack draft. The arrangement -of horizontal and vertical baffles and tangential outlet provides a -single somewhat spiral Apath for the combustion products and assures vquiet opera tion, since there are no `plural paths which might create resonant conditions tending Vto amplify combustion noises or result in ;a definite beat or pulsation of the draft. The arrangement of the vfour baiilemembers 36, 3l, 38, and 39 also facili tates cleaning of the flue passages since space B is conveniently reached Vthrough the draft inlet opening 4o, and since space A may be reached through the inspection opening |9, Lat which time the lower horizontal baille 36 may be removed from lits supporting lugs.
The heat exchanger shown in Figures l, 2, and 3f, is .enclosed in an outer housing .45 which may .be of Somewhat ovol Shape es Shown .Irsoros 5 endo. The housing .45 vhas soonest exchanger positioned in QD@ 69d, and providQS ,Space ,in the .other end for a conventional liquid fuel .burner s6, the latter being connected to the opening i8 of the heater assembly. The burner -46 yincludes a fuel pump lll, an air inlet 42, a blower ,43, and a motor 46 the blower 43 being connected to the opening i8 by a tube (i9, as illustrated in Figure 5. The top member 41 4of the housing ,d5 is provided with suitable louvres 48, shown in rieure 4. to admit air into .the housing .for .the .fool borner 46 and for the orafi; adjuster' 4e. The housing 45 is provided with removable panels to provide access to the burner Y4b and ,to the .piping connections, aoomoto ofmforolsF and indi- Gator connections. The housing 45 may be p rovides with a heat-insulating lining in that 'por- 4 tion of the jacket extending around the heater assembly.
Where the heater assembly is to be used for supplying hot water to heating radiators or radiant heat panel units, a. circulating pump 50 driven by a motor 5I is provided within the housing #.5 Yabove the fuel burner 46 and is connected to a low point return connection 32a vin the jacket lo, as shown in Figures 2 and 6. In such in stallaticns, hot water for the radiators is taken from the tank through upper connection 28, conducted to the heat radiators through conventional pipe systems, and returned to the heater assembly through-circulating pump 50 Within the housing 45. In such installations, the top steam outlet 3l is closed and the air space above the water level in tank 22 serves as a built-in expansion tankl Where the heater assembly is to be used for supplying steam, steam generated in the space above the water level of tank 22 is conducted to its point of use through connection 3| Vand suitable piping, and the condensate is returned to the boiler `through a return line connected to inlety23. 1n such installations, an automatic lowwater cutoff at this point is desirable since the cutof mechanism will be exposed to a flow of clean return water which -prevents the accumulation of mud. Theprovision-Qf the 'stabiliaertube 27? serves as a Hartford loop to prevent the loss of water through the returnli-ne. The stabilizer vtube being within the boiler .-iiue assemblyleliminates the cost of providing an outside loop and eliminates unsightly piping.
An fadequatesupply of -hot water Yfor kdomestic purposes iis furnished bythe tankless coil 29 immersedinihot water -i-n the tank 22. The water Vin tank 272 -is easily maintained at a temperature high enough to heat normal demands of domestic Ahot water. Controls such -as disclosed in my copending application rSerial Number 44,690, led August 1.7; 1948, now Patent Number 2,540,055 issued January 30, 1951, may be used with the heater assembly shown herein to provide water of a desired temperature in each of .several zones or portions of the assembly.
The provision of the draft adjuster to within the space enclosed by housing d5 is advantageous in that any flue blast which may occur when a fluid or vliquid fuel burner mechanism is started blows into the housing l5 where it is sucked up by the fuel burner blower and pumped back intoit-he combustion chamber. This arrangement avoids lblowing soot into the atmosphere outside o f the unit, and also effectively reduces the noise level .of .the operating heater assembly.
The improved baffle arrangement disclosed `herein also reduces the incise level of the esserlon bly, and increases the eeency .of the assembly through -a reduction in the draft loss. The baille arrangement also permits easy cleaning of the flue passages and provides a single flue passage which practically eliminates noise-producing resonant conditions.
It will be apparent that many changes vin minor details, proportions, and design may be carried out within the scope of this invention as donned in the following claims.
.1. .In a heater, e heat exchanger comprising ilo combination, a vvertical annular water jacket, a closed water drum supported partly within and .spaced from the upper portion of ,said Water jacket, circulation tubes connecting said drum to said water jacket, a, circular casing extending upward from the top of said water jacket surrounding and spaced from the upper portion of said drum, a horizontal bale extending from the lower end of said drum outward to said water jacket and closing a portion of the annular space between said drum and said jacket, a vertical baille extending upward from one end of said horizontal baffle and within said annular space, a second horizontal bale extending between said drum and the top of said water jacket and extending laterally from the top of said vertical baffle and closing another portion of the annular space between said drum and said jacket, and a second vertical baffle extending upward from that end of said second horizontal baille removed from said first vertical balle, said second Vertical baille extending radially from the upper portion of said drum to said circular casing, and a flue connection extending tangentially from said circular casing, whereby said arrangement of bales provides a single passage for conducting hot gases upward around said drum to said flue connection.
2. In a heater, a heat exchanger as set forth in claim 1, said annular water jacket having an opening therethrough below the level of the bottom of said drum, and said flue connection having a. draft inlet opening therein adjacent said circular casing, whereby portions of the hot gas passage defined by said baffles are accessible through said two openings for cleaning.
3. In a heater, a heat exchanger as set forth in claim 1, said water jacket having means projecting from the inner wall thereof toward the bottom of said drum for removably supporting said rst mentioned horizontal baille, whereby said rst horizontal baffle is removable to provide access for cleaning portions of the flue passage between said drum and said jacket.
4. In a heater, a heat exchanger comprising in combination, an annular water jacket, a water connection adjacent the upper end of said jacket, a water drum supported partly within and spaced inward from the upper portion of said jacket and extending above the upper end of said jacket, a circulation tube extending from the central portion of the bottom of said drum downward and laterally into said water jacket substantially midway of the height of said jacket, a casing extending upward from the outer wall of said water jacket and ,spaced from and surrounding the upper portion of said drum and enclosing a flue space surrounding the upper portion of said drum, a stabilizer tube extending from the upper portion of said drum downward within said ilue space into the upper end of said water jacket adjacent to said connection, a flue connection secured to said casing, a housing surrounding said heat exchanger, a draft inlet in said ue connection and opening into said housing, and a fuel burner including a blower in said housing,
whereby said blower circulates gases emitted from said draft inlet back into said heat exchanger.
HENRY LEROY MOHN.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 255,107 Gorton Mar'. 2l, 1882 564,640 Patzelt `et al July 28, 1896 719,224 Jaeger Jan. 27, 1903 813,507 Maag Feb. 27, 1906 1,113,232 Mergott Oct. 13, 1914 1,323,302 Martens Dec. 2, 1919 1,542,219 Daechsel June` 16, 1925 1,741,633 Kemper et al Dec. 31, 1929 1,986,914 Avery Jan. 8, 1935 2,002,254 Treloar May 21, 1935 2,048,393 Kroger July 21, 1936 2,059,128 Matthews Oct. 27, 1936 2,245,322 Bork June 10, 1941 2,463,958 Fisher Mar. 8, 1949 2,487,705 Handley Nov. 8, 1949 2,540,055 Mohn Jan. 30, 1951 FOREIGN PATENTS Number Country Date 98,232 Germany Aug. 16, 1892 110,438 Switzerland June 1, 1925 409,743 Great Britain May 3, 1934