US2739219A

US2739219A - Oil-electric heater

Info

Publication number: US2739219A
Application number: US382379A
Authority: US
Inventors: Frank P Tagliaferri
Original assignee: Individual
Current assignee: Individual
Priority date: 1953-09-25
Filing date: 1953-09-25
Publication date: 1956-03-20
Anticipated expiration: 1973-03-20

Description

United States Patent OIL-ELECTRIC HEATER Frank P. Tagliaferri, Baltimore, Md.

Application September 25, 1953, Serial No. 382,379

1 Claim. (Cl. 219-38) This invention relates to heating equipment for domestic and industrial households and more particularly to a type of radiator suitable for distributing heat through the medium of oil and electricity.

It has among its objects to provide a new and improved type of a portable electric-oil radiator that will avoid some of the disadvantages and limitations of the prior art.

Another object of this invention is to provide a new and improved portable electric-oil radiator that will be simple in construction, economical to manufacture and effective in operation.

Another object of this invention is to provide a new and improved portable convector type electric-oil radiator in which a reservoir is filled with #710 heating oil and its temperature raised to 260 degrees F. The radiator is covered with cloth to prevent escape of the heat from the radiator to enable the temperature to be raised up to 350 F. At this temperature moisture and air are driven from the reservoir which is then sealed.

Another object of this invention is to provide a new and improved portable convector type of electric-oil heated radiator having fins positioned on its reservoir approximately 7 to the inch, filling the reservoir with #710 heating oil, raising the temperature of the oil to 260 F. covering the radiator to prevent the escape of heat therefrom until the oil reaches a temperature of 350 F. sealing the filler, and allowing the radiator to cool to prevent air pockets from forming in the oil filled reservoir.

Another object of this invention is to provide a new and improved radiator having a reservoir filled with heating oil to prevent air pockets therein, and an electrical unit enclosed in the reservoir for heating the oil.

Other objects of the invention will become apparent as the details of its construction and principles of its operation are more fully disclosed.

For a clearer understanding of the invention and its objects reference is made to the accompanying drawings. These drawings in conjunction with the following explanation illustrate a particular type of the invention while the claim emphasizes the scope thereof.

In the drawings:

Figure 1 is a side elevation of an electric oil radiator embodying this invention, with a diagrammatic outline of its electrical circuit included;

Figure 2 is a sectional elevation on line 22 of Figure 1 with convector fins omitted;

Figure 3 is an end elevation of Figure 1; and

Figure 4 is a detail showing a side view of a typical Convector fin employed in this embodiment.

Similar reference characters refer to the similar parts throughout the drawings.

A radiator preferably of metal is indicated in the drawings and comprises a tubing having an outside diameter of 1% with a wall thickness and 38 long. Pins 11 are spaced seven to the linear inch and are formed of aluminum 3 /2 X 5 inches of 20 gauge or about .035 thick. The tubing 10 is filled with oil 12 known as No. 710 heating oil and immerses the electrical heating element 13 known as Cromolox tubular type and in this size are of 750 watt capacity. Two of these units mounted in a cabinet (not shown) will adequately heat an average room of 20 feet long, 20 feet wide and 20 feet high to a temperature of 70 F. when the outside temperature is zero F. For use in a smaller room 10 feet long, 10 feet high, and 10 feet wide, the length of the tubing 10 will be 29 inches long, the capacity of each heating element 13 will be 500 watt, and there will be two of these units mounted in a cabinet (not shown) and the same size fins will also be spaced seven to the linear inch and will be of the same material as mentioned above. The ends of the tubing 10 are enclosed by caps 14 having orifices to allow the ends of the heating to project therethrough, and one of the caps is provided with a filler hole 15 to allow the oil to be placed in the tubing and closed when the proper temperature is reached.

The manner of filling the units with oil is considered important and is performed in the following manner. First the unit is filled with the No. 710 oil through an orifice 15 and heated with the element until it is 260 i and held there for a short period. Then the unit is insulated by covering with cloth or other suitable inateriai that obstructs the radiation of the heat. The temperature of the oil in the unit is raised until it is 350 F. and held at that point for approximately fifteen minutes. This eXpels all air and moisture from the oil tending to reduce its effectiveness. Then the plug 15 is sealed tight, and the units allowed to cool otf to a normal temperature.

When the units are used normally, the elements are electrically energized to bring the temperature of the oil to 260 F. The elements are suspended longitudinally and axially in the tubing and have binding posts or connections 24 suitably insulated, connected through the plugs or caps 14 to them.

This temperature is maintained at 260 F. indefinitely, the heat being dissipated by the fins and receiving it most efficiently through the medium of the oil to the walls or" the tubing and the fins. This temperature is found effective although it can vary from 250 F. to that point without much change in efliciency. The pressure of the oil at this temperature offers no hazard, as the stresses brought on to the tubing was that raised by the tempera-- ture of 350 F. which were appreciably greater.

An electric circuit 20 indicating diagrammatically the preferred layout for the system using this invention, is presented in Figure 1. It includes a thermostat 21 to control the temperature of the elements independently of the dissipation of its heat by the fins. The service to the circuit is of conventional type and adapted for the elements employed. The voltage can be or 220, for normal operating conditions. The manner of attaching the fins is preferably arranged by flanges 22 sweated or pressed tightly onto the peripheral surface of the tubing 10 and serves as spacing for them. The fins are rectangular and placed so a larger area extends above the tubing. Brackets 23 are mountable on the end portions or plugs of the tubing to support them from the floor, and pref erably of the form indicated.

While but one general form of the invention is shown in the drawings and described in the specification, it is not desired to limit this application for patent to this particular form as it is appreciated that other forms of construction could be made that would use the same principles and come within the scope of the appended claim.

Having thus described the invention, what is claimed is:

The process of preparing for use a closed tubular heating unit having a heating electric coil therein consisting in filling the heating unit with oil, heating the oil to a temperature of about 260 F., discontinuing the heating for a short period, then covering the unit with insulating material, resuming heating of the oil to a temperature of about 350 F., maintaining that temperature for about fifteen minutes, discontinuing the heating, and sealing the unit.

References Cited in the file of this patent UNITED STATES PATENTS