US974330A

US974330A - Electrically-heated boiler.

Info

Publication number: US974330A
Application number: US50660409A
Authority: US
Inventors: Christian Aalborg
Original assignee: Westinghouse Electric Corp
Current assignee: Westinghouse Electric Corp
Priority date: 1909-07-08
Filing date: 1909-07-08
Publication date: 1910-11-01
Anticipated expiration: 1927-11-01

Description

c. AALBO RG.

ELECTRIGALLY HEATED BOILER.

APPLICATION FILED JULY 8, 1909. v v 974,330. Patented Nov. 1, 1910.

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iii Lyn v Z 'K a a i 14 i 1E f. *fi L LI"? 7F") J P f 9 6% "J H f f ""W 1 L -U f 9 k "J I m 1 I 1 L'\- T JJ J 9 M WITNESSES: Z INVENTOE AT TORNEY G. AALBORG. ELBGYTRIGALLY HEATED BOILER.

APPLICATION FILED JULY 8, 1909.

atented Nov. 1,1910.

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WITNESSES:

Z Z INXENTOR ATTORNEY UNITED STATES PATENT OFFICE.

CHRISTIAN AALBORG, 0F WILKINSlZURG, PENNSYLVANIA, ASSIGNOR T0 VJESTING- HOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENN- SYLVANIA.

ELECTRICALLY-HEATED BOILER.

Specification of Letters Yatent.

Patented Nov. 1, 1910.

To all whom it may concern:

Be it known that I, CHRISTIAN AALBoRG, a citizen of the United States, and a resident of Vilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Electi'ically-l-leated Boilers, of which the following is a specification.

My invention relates to electrically heated boilers or steam gene ators. and it has for its object to provide a device of this character that shall be simple and durable in construction and that shall provide a maximum heating surfacr with a minimum external radiating suriace.

Figure 1 of the accompanying drawings is an elevation of a boiler constructed in accordance with my invention and having a plurality of units arranged in multiple, Fig. 2 a view partially in section and partially in elevation of one-of the units shown in Fig. 1, Fig. 3 is an elevation at right angles to that of Fig. 2, and Fig. l is a detail view of a portion of the resistance elementwhich is embodied in the appa'atus shown in the other figures.

Referring to the drawings, the structure here shown comprises a tank or boiler 1 in which water, or some other fluid to be heated, is-contained and a plurality of

like heater units

2, 3 and .l which are connected to the tank 1 in multiple arrangement.

Each of the units is composed of a body member, preferably constructed of cast metal, havin two similar halves 5' and 6 which are cliimped together by any. suitable means, such as bolts 7, the joint between the two halves being carefully fitted and provided with a suitable packing 8.

Each of the units is provided with an inlet pipe 9 and an outlet pipe 10, so that a continuous circulation of liquid may be cll'ected from the tank through the unit and back into the tank. Each of the castings 5 and (l is provided with a plurality otin-,

wardly extending projections 11 in which relatively narrow slots 12 are cut from the outer surlace of the unit so that its surfaces become deeply corrugated but the probroken by the narrow slots 12 in which the resistance units 13 of the device are disposed;

As shown in Fig. 4 of the drawings, each resistance unit comprises a strip or ribbon of steel, or other suitable conducting material, having a plurality of slots 14 cut alternately from opposite edges to provide a zigzag path for the electric current. The slots 12 are first provided with insulating cells 15 of U-shapedsection and then the resistance ribbon is forced into place between the layers of insulation and is wound back and forth through successive'slots, it being carried beyond the ends of the castings in order to avoid grounding thereon. (See Figs. 2 and It. is evident that a very large proportion or ribbon is transmitted directly through the adjacent Walls of the castings to the liquid within, while the external radiation is reduced to a minimum by reason of the form of the casting. If sufiicient heat is imparted to the liquid within the unit to materially increase its pressure, this increased pressure will tend to force the walls of the device even more firmly into contact with the insulated resistance element. The electrical connections between groups of resistance may be arranged in any suitable manner, accord ing to the heat required, and the voltage of the circuit from which energy is received.

I desire that variations in size and arrangement of parts, which do not depart from the spirit of my invention, shall be included Within its scope.

I claim as my invention:

1. An electrically heated steam generator comprising a. relatively flat resistance element, a receptacle having a plurality of ribs or projections on the inner surfaces of its Walls, and slots cut in its outer wall and extending into the projections or ribs to receive said resistance element, whereby the fluid pressure Within the receptacle compresses the resistance element.

2. An electrically heated steam generator comprising a cast metal receptacle having inlet and outlet ports at opposite ends, and a plurality of pa 'allel ribs projecting inwardly from its walls and parallel slot-s cut into the ribs or projections from its outer surface, and a resistance strip or ribbon of the heat generated in the resistance strip threaded back and forth through the slots 1 pressure in the receptacle eompressesthe re- 10 for transmitting heat through the projec sistance element.

tions into the liquid contained within the re- In testimony whereof, I have hereunto ceptacle, whereby the fluid pressure Within subscribed my name this 28th day of June,

compresses the resistance strip or ribbon. 1909.

3. A heating receptacle for liquids having CHRISTIAN AALBORG. inwardly ro ecting ribs provided with re- Witnesses: cesses, and an insulated resistance element R. J. DEARBORN, seated in said recesses, whereby the fluid B. B. HINES.