US1782380A - Unrestricted-return water heater - Google Patents

Description

Nov. 18, 1930. w. A. DALEY UNRIEJS'IRICTED RETURN WATER HEATER Filed April 25. 1927- 2 Sheets-'Sheet l uw EL;

Nov. 18, 1930.

W. A. DALEY UNRESTRICTED RETURN WATER HEATER 2 sheets-smet 2 Filed April 23. 1927 Patented Nov. 18, 1930 @UNITED STATES PATENT OFFICE WALTER A. DALEY, OF CHICAGO, ILLINOIS, ASSIGNOB TO BELL & GOSSETT F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS UN RESTRICTED-RETURN WATE'B :HEATER applicati@ med April 23,

My present invention relates to the provision of a type of water heater in which the heat transfer elements consist of one or more groups of converging or diverging tubes communicating at their converging ends and secured in 4a transverse plate at Y their diverging ends. The heat transfer elements are associated either in a single group or in a plurality of groups with an exterior head to receive' the'exterior connections for supplying water to and conveying it from the heat transfer elements, and means arel provided for securing the head and the transverse plate of the heat transfer element or elements about the edge lof a suitable aperpressure vcirculation therethrough. IA have' Y also secured a. iuncture'between the tubes of the heat transfer elements at their converging ends by means ofa structure or fitting, the parts whereof are brazed or otherwise sealed together and to the ends of the tubes so as to provide even a greater capacity at nthe place of juncture than either tube separately or bothtogether would afford. Such a fitting may be made of a thickness of metal no greater than that of the heat transfer tubes themselves so as not to diminish .tt the heat transference during the passage of arrangement is lmportant as this unavoidable bend in the path of travel 0f lthe water water through the fitting, and can be made tp conform vvery/.closely tothe shape of the tubes Without any kind of machine work, and will slide into a more" restricted space than any return bend pipe or cast fitting. This during the heat transfer ,process offers the greatest impediment to a gravitational c irculation,\and by making the'juncture between the ingoing and outgoingvtubes of the heat transfer portion of vgreater capacity I have both improved the circulation through the system and improved the juncture portion asa heat transfer element in itself.

4 shown in Fig. 5;

1927. Serial No. 186,061.

Accordingly as one or moregroups of heat transfer tubes are assembled at their diverging ends with a single transverse plate they may be -employed with a number of different exterior heads .to facilitate assembly with a particular hot water circulating systemand for the purpose of increasing the capacity of the apparatus for furnishing hot water.

The design of structure heretofore -re ferred to is illustrated 4in the accompanying drawing, in which- ,V

Fig. 1 is a side elevation, largely in central, longitudinal, vertical, section, of a complete assembly of a group of heat transfer tubes lwith an exterior head and boiler plate;

Fig. 2 is a front elevation of the structure shown in Fig. 1;

F'g. 3 is a central, longitudinal section through the converging ends of the heat transfer tubes and the means for securinga juncture between them;

COMPANY,

Fig. 4 is a perspective of the rear end plate of the structure for forming va juncture between the heat transfer tubes;

Fig. 5 is a central, longitudinal section `of a different form of external head than that shown in Fig. 1, shown in assembly with a y,boiler plate and the heat transfer element;

Fig. 6 is a front elevation of the structure Fig. 7 is a rear elevation of the exterior head shown in Fig. 6;

- Fig. 8 is also a rear elevation of the structure shownin Fig. 6 indicatingthe relation of two groups of heat transfer tubes thereto';

y Fig. 9\is a perspective shovfing the relation of the rear endsof two groups of heat transfer units when Jised together.

'Similar reference characters have been employed throughout the several views to designate similarparts.

A singleunit or heat transfer element consists of two tubes, 15 and 16, of equal length disposed vertically, that is, one above theother, and held .invslightly converging or divergin'g relation by meansof anl anterior or front" plate, 17, and a posterior or remote juncture lfitting, 18.

.The anterior plate, 17, is bored or other-p wise perforated for the passage of the forward ends of the heat transfer tubes therethrough and is secured to the tubes a short distance back to their front ends by brazing or sweating or in any other desired manner.

The remote, or posterior, ends of the heat transfer tubes are provided a short distance in front of their rear ends with an exterior bead, 19. The member/ for securing a juncture between the rear ends of the heat transfer tubes is formed by taking a suitable length, 2O` of a much larger tube and deforming it until it is of an oblong outline. The centers of the forward edges of this length of tube 20 areinwardly compressed, as shown at 21 in Fig. 3, to enter between the converging ends of the heat transfer tubes and 16. The rear edges of the heat transfer tubes are beveled as shown at 22 in Fig. 3, and when the heat transfer tubes are inserted in the front end of the length of tube up to the beading 19, spelter is placed in the recess l formed by the bevel 22 and the whole is heated until the above described parts are sweated together. It will, of course, be understood that a like sealing of the parts together may be attained bythe use of any metal which may be similarly lmelted and flowed into place. A very good and dependable joint can be formed as above described, whereas if this operation is attempted by flooding the joint from the outside it will probably result in dissolving and removing some of the metal of the tubes 15, 16 or 2O in the hot spelter or fused metal which usually acts as a. solvent for copper of which metal the heat. transfer tubes are usually made.

After this interior brazing or sealing has been done, a beveled rear end.plate, 23, is inserted in tlie length of tubing 20, against inwardly extending bosses 23a providedto support the plate 23 while it is being sealed in ,position` and spelter is again placed in the cavity formed by the bevel, when a final heating secures the entire structure in a unitary or integral mass of ample strength and large capacity, relative to the capacities of the tubes, and a somewhat more extended surface to which the surrounding heated medium transmits heat by. conduction.

In Figs. 1 and 2 is shown a form of head which is extremely simple and which is arranged to take the feed and discharge pipes directly into its face. This form of head comprises a casting 24 extended to provide ears 25 at its two opposite ends, which ears are perforated, as at 26, for the passage of stud bolts 27 tapped into the boiler plate 28.' The forward face of the casting 24 is substantiallyA iat andthis is bored'and tapped at 29 and 30 .for assembly with the supply and Ldischarge pipes. rl`he bores 29 and 30 communicatel with interior chambers 31 and 32, separated by a partition, 33, which extends rearwardly into the plane of the rear of the head. The chambers 31 and 32 open rearwardly through apertures 34 and 35 and the rear face 36 of the casting 24 substantially registers with the forward face of the plate 17 heretofore described. f

The boiler plate is apertured at 37 for the passage of the tubes 15 and 16 and a gasket 38 is employed between the rear face of the plate 17 and the boiler plate.

Another gasket or Washer, 40, is interposed between the forward face of the plate 17 and the rear face 36 of the casting 24. Nuts 41 on the outer ends of the stud bolts 27 hold the castings 24, plate 17, and washers v38 and 40, firmly to the boiler plate, 28, with any degree of force which may be desired.

The head shown in Figs. 5 to 8 inclusive, is similar to that shown in Figs. l and 2 in all essential details except the body portion of the head 24a has extending therefrom a neck 42 on the outer endwhereof is an enlargement 43, bored and tapped in its face at 29 and 30a, and also laterally both'in its bottom and top at 44 and 45.

In the head shown in Figs. 5 to 8 inclusive, it appears how, by merely enlarging the rear opening 34a, the same head may be used for one or a plurality of groups of heat transfer tubes 15a and 16a. f

It should be noted that in each form of head the internal transverse partition 33 and 33n is transversely bored as at 46 and 461l to provide a bleed hole so as to permit the flow of any air released from the water from lower compartment-s 31 and 31a to upper colnpartments 32 and 32a from which any such air is immediately discharged through the discharge connection.

In Fig. 9 is shown in fragmental detail the relation of the juncture fittings 18, when two groups of heat transfer units are employed in a single head.

As will be seen from the foregoing description taken in connection with the drawings, the tubes in each group of heat transferl` tubes 15 and 16 are disposed vertically with respect to each other and at a slight angle to each other, so that when the axis of 'these tubes is arranged horizontally theV conduit provided by the tubes and their juncture fitting 18v either rises or falls throughout its entire length; This facilitates both the gravitational and pressure circulation through these tubes, and the juncture fitting 18, having a capacity larger than either of the tubes taken separately or combined, does not act as a deterrent to circulation at the bend or change of direction in the flow.

Having described my inventionA what I claim as new and desire tosecure by Letters Patent is: f

1. In a water heater a heat exchange unit4 comprising a'group of tubes one end of which tubes bemg united in a casing, eomprlsmg a deformed length of tubing with a closure for its rear end and the other ends of which tubes are united by a transverse plate.

2. A fitting for joining a group of heat transfer tubes comprising a length 'of tubing deformed at one end to conform with the noncontiguous surfaces of said heat transfer tubes which it receives and provided with a closure at the rear end.,

3. A fitting for joining a group of heat transfer tubes comprising a length of tubing deformed at 'one end to conform with the non-contiguous surfaces of the heat transfer tubes which it receives and having interior projections at its other end co-operating with a closure for said end.

4. A fitting for joining a group of heat transfer tubes comprising a length of tubing deformed at one end to conform with the non-contiguous surfaces of the heat transfer tubes which it receives and means at its other end for locating and co-operating with a. closure plate for said end.

5. Means for effecting a juncture between a group of heat transfer conduits compris, ing a length of tube deformed at one end to the non-contiguous forms of said conduits, a closure plate for the other end thereof, and

means on said latter end for locating and cooperating With said closure plate.

6. In a Water heater, a heat exchange unit comprising a group of tubes inclined andhaving their contiguous portions sealed directly together at one end, a length of tubing deformed at one end to conform to the non# contiguous surfaces of said tubes which it receives, a closure for the other end of said. deformed tube, and means for securing the other ends` of said group of tubes in spaced relation.

` WALTER A. ,DALEY.

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