Патент USA US2406052код для вставки
Aug. 20, 1946"- c. E.' wnîLlG -SIDE ARM HEATER Filed'Feb. 19, 1945 Z INVEN TOR. i I y l _A_TTOPNEYS Patented Aug. 20, 1946 UNITED STATES PATET 2,406,052 SIDE ARM HEATER Celestìn Eugene Willig, Buffalo, N. Y. Application February 19, 1945, Serial No. 578,781 2 Claims. (Cl. 122-245) l 2 This invention relates to a side arm Water heater, such water heaters being used in connec tion with a domestic water tank to heat the `water in the tank by convection, the water being with drawn from the lower part of the tank and upon being heated in the heater rising and being re turned to the upper part of the »tank so as to effect a recirculation and heating of the body of water in the tank. assembled condition so as to reduce Shipping space as well as to facilitate both the manufac-` ture and the installation of the heater. Another object is to provide such a water heat er in which pockets in the water line are avoided, thereby to prevent the accumulation of sediment and to insure the heater operating at high efñ ciency for a long time. Other objects and advantages will appear from' One of the principal objects of the present 10 the following description in which: invention is to provide such a side arm water Fig. 1 is a vertical section through a gas heated heater, heated by gas, in which provision is made side arm water heater embodying the present for long narrow flue travel of the gas and to invention and showing its water, gas and flue provide such a heater in which the maximum connections. amount of gas is brought in contact with the 15 Fig. 2 is an enlarged horizontal sectional View, water coil to obtain the maximum amount of taken on line 2--2, Fig. 1. heated water. Figs. 3 and 4 are horizontal sections, taken on Another object is to provide such a water heat the correspondingly numbered lines of Fig. 1. er which is compact and at the same time has a The side arm heater embodying the present large amount of water tube surface and has high 20 invention includes a water coil indicated gener heat transfer efficiency. ally at l and housed within a sectional jacket, Another object is to provide such a side arm indicated generally at 2, the gas being supplied` water heater, heated by gas, in which dead or to a burner 3 at the bottom of the casing 2 and useless space is avoided andV in which flame 25 the products of combustion passing out from the spreaders and the like are eliminated. upper end of the casing 2 through a flue fl. The Another object of the invention is to provide coil l is preferably made of copper and includes such a heater in which the ñame does not con a central vertical tube 5 o_f substantially greater tact the coil thereby to increase the life of the diameter'than the water inlet and outlet pipes ‘ coil. ' Another purpose is to provide such a heater having a straight flue and in which the use of baliies or the like is avoided. Another purpose is to provide such a heater in which the water inlet and outlet are in axial alinement at the center of the heater thereby to permit of installing the side arm heater closer to the storage tank, to save space and to provide a side arm heater which is of pleasing appearance. Another object is to provide such a side arm heater which can be readily provided in any size required. ' A further object of the invention is to provide such a side arm heater which is easily installed, removed and reinstalled and in particular can receive'the gas supply pipe from any side so as to avoid the necessity of elaborate pipe ñtting. A further object of the invention is to provide a simple sectional jacket which can be placed in position after all the piping connections have been made thereby to facilitate the installation of the heater as well as to permit ready removal, inspection, cleaning and repair. 6, 8, the central tube 5 being reduced at its lower end and swaged to the water inlet pipe 6 and being similarly reduced at its upper end and swaged to the Water outlet pipe 8. It will be understood that the water inlet pipe 6 connects with the lower end of the water storage tank (not shown) and that the water outlet pipe 3 con nects with the upper end of this water storage tank so that the water, upon being heated and traversing the coil l, will rise and effect a re 40 circulation of the water through the water stor age tank. ' ' ~ To the lower end of the enlarged central tube 5 of the water coil is secured the lower end of a helical coil l0, the convolutions of this helical coil l0 surrounding the central tube 5 and being spaced therefrom so that the products of combus tion from the heater 3 pass upwardly through the annular ñue provided between the central tube 5 and the helical coil I0. The upper end of the 50 helical coil I5) is secured and discharges into the upper end of the central tube 5. ' It will therefore be seen that the water enter- I ing the coil l from the inlet pipe 6 passes up A further object is to provide such a heater wardly in two parallel streams, one stream flow which can be manufactured and shipped in a dis 55 ing through the central vertical tube 5 and the 2,406,052 3 4 other stream flowing through the helical coil Ill. be completely installed before the unit „is encased. In order to balance the flow of the water through This greatly facilitates installation, particularly the heater so as to obtain approximately the same rate of ñow in the central tube 5 as in the helical as Athe gas pipe l 5 can come in from any side and coil I0, baille means are preferably provided in the central tube 5. For this purpose a helically twisted strip of metal l2 is shown as arranged in the central tube 5, this being designed to pro vide resistance to approximately balance the greater resistance of the helical coil 5. It will also be seen that this twisted bañle strip I2 pro vides increased turbulence and secures improved heat transfer efficiency. Further, to increase heat transfer efficiency and also to increase the ' surface area of the helical coil I0 with reference to the cross sectional area of this coil, this coilA 1 is preferably flattened instead of being circular in cross section. also does not have to be placed with a high degree of accuracy since the horse-shoe shaped burner permits considerable latitude in locating the burner. After the piping is completed the casing is applied, this merely requiring the wraping around of the shell 20, the application of the two part end .heads 22 and 28 and tightening the bolts 26. From the foregoing it will be seen that the present invention provides a coil for a side arm heater which is free from sediment pockets; is compact; and has high heat transfer efficiency, particularly in the passing of the water in par allel through the central tube 5 and the helical tube I0, the two forming a straight ñue expos ing a large amount of surface to the heated gas. In order to facilitate the connection- with the 20 Further, the provision of bañies or flame spreaders gas supply pipe, the burner 3 is in the form of a is unnecessary and the coi1 is also protected horse-shoe shaped casting which permits it to against injury from the flame of the burner. be inserted under the coil l from any side and The heater is also readily installed and provides also permits it to be so inserted and removed c, an attractive side arm heater. after the coil has been connected with the inlet 25 I claim as my invention: and outlet pipes 6, 8. 'I'his burner is Yprovided 1. In a side arm water heater, a coil assembly with the usual oriñces in its upper side Vfor the comprising a substantially straight vertical cen discharge of the fuel mixture and the burner is tral water tube of relatively large diameter, a arranged so as to embrace the inlet pipe 6 immedi water inlet pipe of smaller diameter than said ately below the lower reduced end of the central central tube extending axiallyl from thevlower vertical tube 5. The burning gas from the burner end of said central tube, a water outlet pipe of 3 thereby is discharged around the enlarged cen smaller diameter than said central tube extend tral tube 5 which avoids the necessity of a- flame ing axially from the upper end of said central spreader or the like, this gas passing vertically Y tube, a second water tube of smaller 'diameter upward principally through the annular iiue space 35 than said central tube and having a series of con provided between the central `tube 5 and the sur volutions surrounding said central tube 'in spaced rounding helical coil lll. The burner 3 connects relation thereto and generally concentric there by a pipe l5 with amixing valve i6, the gas sup with, means connecting the upper and lower ply line being indicated at I8. , ' ends of said second water tube with the upper After the water and gas connections have been and lower ends, respectively, of said central tube made the casing 2 can be Vassembled around the whereby the water flows upwardly through said burner 3 and coil I. For this purpose the casing two water tubes in parallel, and a helically twisted is shown as including a tubular sheet metal shell ribbon in and extending substantially the full 20 which can be longitudinally split, as indicated length of said central 7tube and impeding the at 2l, or made in two separate pieces so as to per 45 ilow of Water therethrough thereby to divert an mit of its application around the coil i after it increased proportion of water through said sec has been installed. At its upper end this tubular ond water tube. , _shell 20 is embraced by the two halves of an upper 2. In a side arm water heater, a coil assembly end head 22, this end head having a cylindrical comprising a substantially straight vertical cen side wall which embraces the upper end of the 50 tral water tube of relatively large diameter, a shell 20 and is formed to provide the flue 4, and water inlet pipe of smaller diameter than said this end head also having an end wall which is central tube extending axially from the lower provided with a hole receiving the pipe 8. To end of said central tube, a water outlet pipe of secure the two halves of the upper end head 22 smaller diameter than said central tube extend together, to each half of this end head is riveted, 55 ing axially from the upper end of said central or otherwise suitably secured, a half section of tube, a second water tube of smaller diameter a collar 23. This'collar has an upstanding tu bular portion 24 which embraces the pipe 8 and to secure the two halves of the collar together than said central tube and having a series of convolutions surrounding said central tube in spaced relation thereto and generally concentric ’ each half is provided with a pair of flanges 25 therewith to provide an annular vertical flue be through which bolts or other suitable fastenings tween said tubes, and means connecting the 26 extend. A similar bottom end head 28 is pro upper and lower `ends of said second water tube vided, this bottom end head being formed intwo with the upper and lower ends, respectively, of halves and secured together by a two part collar said central tube whereby the water flows up 29 which is similar to the collar 23V and the halves' 65 wardly through said two water tubes in parallel, fastened together in the same manner. and a U-shaped gas burner having horizontal'I'he lower end head 28 can be provided with a legs connected at one end only and embracing slot 30vfor receiving the gas pipe l5 and any ad said water inlet pipe below said central tube and ditional openings can be provided for admitting discharging burning gas to flowupwa'rdly through air to the lower end of the casing. Y c 70 said annular flue in contact with both of said; With a casing constructed as above it will be seen that the water coil and the gas burner can tubes. t ~ ' CELES'I'IN EUGENE WILLIG. i '