US1818861A - Electric steam generator - Google Patents

Description

Aug. 11, 1931. A. N. OTIS ELECTRIC STEAM GENERATOR Filed Sept. 26, 1927 QAIUJ 32m Ocfi x t 0 mm m vr A nmjs Patented Aug. 11, 1931 UNITED STATES.

PATENT OFFICE ALBERT N. OTIS, OF SCHENECTADY, NEW

YORK, ASSIGNOR T GENERAL ELEmIO Application fled September 26, 1927. Serial No. 221,897.

My invention relates to electric steam generators and has for its object the provision of a reliable and efiicient device of this character.

In carrying out my invention in one form, I provide a suitable rece tacle or' boiler having an intermediate 0 set portion together with electric heating units which are mounted on this portion and project into the interior of thereceptacle.

For a more complete understanding of my invention, reference should be had to the drawings in which Fig. 1 is an elevation view partly in section of an electricsteam generator embodying my invention; while Fig. 2 is a fragmentary View in section showing a modified form of my invention.

Referring to the drawings, in one form' of my invention I provide a suitable receptacle or boiler which comprises a lower ortion 10 and an upper portion 11 which is considerably smaller than the lower portion. As shown, the boiler is of an upright type, the portions 10 and 11 being cylindrical and having a common axis which is substantially vertical. The two portions are joined together by a substantially horizontal flangelike off-set portion 12 whereby the two portions are in communication with each other at their tops and bottoms respectively and form together a closed boiler receptacle.

For the purpose of heating the boiler, electric heating units 13 are mounted on the horizontal flange portion 12. These heating units may be of any suitable immer sion type, and preferably are of the type shown in Patent No. 1,522,992, to Abbott, dated January 13, 1925. Each comprises an elongated sheathed heating unit 14 which is in the shape of a hairpin having its ends secured to a screw plug 15 which is screwed tightly into a tapped hole in the flange. The heating units 14 are arranged in substantially vertical positions in the lower portion of the boiler adjacent the side wall. Suitable terminals (not shown) for the heating units project'from the plugs 15 whereby the units may be connected to a suitable electric supply source. In order to promote thermal circulation of the water in the boller, a

cylindrical bafiie member 16 is mounted on supports 17 in the lower portion of the boiler in concentric relation therewith and also in spaced relation with the top and bottom. As shown the heating units project downward between this baifie and the wall of the boiler, and in the operation of the boiler the water heated in this space tends to rise and is re laced by colder water which flows downward centrally through the bafile, as indicated by arrows.

The water level in the boiler is maintained considerably above the flange portion 12, substantially at the point indicated by the reference numeral 18. Water is' supplied as desired through a feed water pipe 19. It will be noted that with this arrangement the heating units are completely immersed in the water whereby the most effective operation is obtained. Furthermore, this arrangement has the advantage that the boiler need be emptied only to a point somewhat below the flange in order to permit the removal of the units for removal or repairs. A still further advantage is that the units may be removed in the space required by the height of the boiler, no additional head room being required, as would be necessary if the units were inserted at the .top of the boiler.

In the modified form of my invention shown in Fig. 2, I have shown the flange portion 12 as inclined downward from the upper portion of the boiler, whereby the electric heaters secured thereto extend downwardly in inclined positions. this arrangement, the generation of heat is distributed throughout a greater portion of the boilerthan with the arrangement shown in Fig. 1.

While I have described my invention as embodied in concrete form and as operating in a specific manner in accordance with the provisions of the Patent Statutes, it should be understood that I do not limit my invention thereto since various modifications thereof will suggest themselves to those skilled in the art without departing from the spirit of my invention, the scope of which is set forth in the annexed claims.

With

What I claim as new and desire to secure by Letters Patent of the United States, 1s:

1. The combination with a receptacle for containing a liquid to be heated, the walls of said receptacle being provided with an intermediate oflset portionbelow the level of said liquid, of an electric heater mounted on said ofiset portion extending into the interior of said receptacler 2. The combination with a boiler having an intermediate oil set portion in its side walls arranged below the water level of the boiler, of a plurality of immersion heating units mounted on said portion extending into the interior of said boiler.

3. An electric steam generator, comprlsing a boiler provided with a lower portion and an upper smaller portion for jointly containing the water to be heated, a flange joining said portions, and elongated immersion heaters mounted on said flange extending into said lower portion.

4. An electric steam generator comprising a pair of receptacle sections of difierent sizes for jointly containing the water to be heated, a flange member joining said sections to form a receptacle, and a plurality of electric immersion heaters mounted on said flange extending into said receptacle.

5. An electric steam generator comprising upper and lower cylindrical receptacle sections of different diameters for jointly containing the water to be heated, a flange joining said sections, and a plurality of electric immersion heaters mounted on said flange extending downward into said lower section.

6. An electrically heated boiler comprising a vertically arranged tank, the upper portion of which serves as a steam drum and is of less diameter than the lower portion, a horizontally arranged wall joining the lower and upper parts of the tank, a series of electric heating units of the immersion type passing through the horizontal wall and supported to hang at an an le with the vertical around the sides of t e lower tank part to points near the bottom.

7. An electrically heated boiler comprising a tank with its lower part of greater diameter than its upper part and having a horizontal wall joining said parts, a series of spaced electric heating units of the immersion type mounted to hang at an angle with the vertical below said horizontal wall to points near the bottom of the tank, and provide heating means adjacent the outer walls of the lower tank part.

8. An electrically heated boiler comprising a tank loving its lower part of greater width than its upper part with a cross wall joining said parts, a series of electric heating units hung at an angle with the vertical in the lower part of the tank below said cross wall and extending to points near the bottom of the tank.

9. An electric liquid heater comprising upper and lower sections of respectlvely relatively small and large sizes, a flange joining said sections to form a tank for the liquid to be heated, said flange being be low the level of the liquid in said tank, and a plurality of electric immersion heaters mounted in spaced relation on said flange and extending from, said flange into the interior of said tank so as to be immersed in the liquid in said tank.

In witness whereof, I have hereunto set my hand this 23d day of September, 1927.

ALBERT N. OTIS.

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