DE1185312B - Method for pulling a long, flexible and insulated electrical heating element into a hollow body and a device therefor - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN -iiiSTWW PATENTAMT Internat. KL: H 05 b

EDITORIAL

German class: 21h -2/01

Number: 1185 312

File number: O 7921 VIII d / 21 h

Filing date: March 2, 1961

Opening day: January 14, 1965

The invention relates to electric radiators and in particular to the manufacture of radiators in which is retracted an electrical resistance heating element.

In the usual production of radiators with retracted resistance heating elements such an element was inserted coaxially into a straight pipe with a circular cross-section, after which the pipe is covered with a thermally conductive, electrically insulating material such as magnesium oxide, was filled. When it came to the production of hotplates for electric cookers, that became Tube bent into a flat spiral with the appropriate radius and compressed radially in order to usually achieve the desired cross-section with a flat top.

When the pipe is deformed into a flat spiral by bending, the insulating filler material becomes Exposed to stresses, often crumbling and forming cavities, which affects the reliability and affect the effectiveness of the facility. When changing the cross-section of the Radiator by bending and squeezing to get the desired shape, the Loads are transferred to the electrical element located in the radiator with the result that this breaks, interrupts the circuit and renders the heating unit worthless. For heating units that As they are more tortuous and extensive than hotplates for kitchen stoves, these disadvantages are even more pronounced weight.

Was a heating element desired that coiled and / or flipped within a common structure proceeds, the aforesaid jacketed heating unit became the desired shape of the desired Build-up molded and poured molten metal into the mold, making it the shaped encased heating unit.

It's also been a method of pulling in a long, pliable, and insulated electrical Heating element in a hollow body with a continuous, running in several directions, tubular channel suitably made by inflation is known which has open ends, wherein the heating element is inserted into one of the open ends, namely the inlet opening and is freely movable in the channel.

The invention improves this method for

production of radiators by admitting a pulsating, in particular intermittent air flow into the inlet opening, which during the retraction of the heating element unhindered the process of retraction of a long,
flexible and insulated electrical
Heating element in a hollow body and a
Facility for it

Applicant:

Olin Mathieson Chemical Corporation,
New York, NY (V. St. A.)

Representative:

Dr.-Ing. H. Ruschke, patent attorney,

Berlin 33, Auguste-Viktoria-Str. 65

Named as inventor:

Lester J. Tranel, St. Louis, Mo. (V. St. A.)

Claimed priority:

V. St. v. America March 9, 1960 (13 836)

flows through the channel around and past the element and has such a pressure, that by him the heating element is drawn through the channel.

Means for performing the method is through a tubular, having the inlet port of the channel characterized airtightly connected mouthpiece, through which the heating element in the Channel is introduced, which at a point approximately in the middle of a pipe branch to Having inlet of the air flow.

The tubular mouthpiece expediently starts from an airtight chamber that contains the heating element in coiled form, and on the mouthpiece is at one between the chamber and the inlet opening of the channel is a sloping point, the air inlet under a pressure Pipe branch provided.

The invention is described below, for example, with reference to the drawing, in which shows

1 shows a diagrammatic representation of an embodiment of the invention for inserting an insulated electrical resistance element into a tortuous canal located in a solid flat body,

FIG. 2 shows a section along the line II-II in FIG. I ₅

409 768/306

3 4

F i g. 3 a diagrammatic representation of another sheet can also be used either before or after

Ren embodiment of the invention for introducing the expansion of the channels further processed and in

an electrical resistance element can be brought into the desired shape. Example

The evaporator plate for refrigerators can be the channels that emerge in a solid, flat body

hold, 5 can be bent to fit a freezer

Fig. 4 forms a detail from a section according to the refrigerator. For the purpose of this earth electrode Line IV-IV in FIG. 3 and finding are the ones receiving the heating element

Fig. 5 shows a detail from a section, the channels in the plate fully inflated. Self-evident

Another cross-section of the above ^Lich may be such expanded or shaped

Figures shows tubular channels shown. i ° channels are also manufactured in such a way that

The heating element is provided in the inlet of a ^tube-two associated plates with the profile of the shaped, extending a convoluted or corresponding to desired depressions channels several directions pattern verlau- introduced and the respective parts to form fenden channel in a suitable these Channels are united with each other.
Structure is included, the element, as said, ¹ S Fig. 1 shows a plate 1 produced ^{by pressure welding according to a} known method in the channels over their entire length. Thereafter, into the inlet of this plate, ^the SE was constructed from two sheets of an aluminum pattern of cavities, a pulsating air flow mmiumlegierung intermittently inserted with the following Zusammensetbeispielsweise, the Zung un-:

prevents through the cavity and the ² ° at least 99.0% aluminum

Molten element flows past so that the element does not contain more than 1.00% silicon and iron

The only resistance is that of the air - max. 0.20% copper

flow is opposite. It has been shown to have a maximum of 0.10% zinc

that this pulsating air flow causes the max. 0.05% manganese

Element hovers more or less in the air flow ² 5 max. 0.15% impurities
or is carried by it, whereby the

Forces of the air flow acting on this element are produced, between which two independent separate

move into the canals. The tubular channels were arranged in patterns of antiperspirant material.

can have any cross-section, depending on which pattern the two correspond-

For example, a rectangular, hexagonal, a 3o den independent systems of tubular channels 2

spherical and the like, and can form in any one ^{and 3} , which are arcuate next to each other

ER- structure, in either a casting or between he ^üb a substantial part of the plate 1 away

a number of folded sheets, with the pattern 3 over a straight line

those which, due to cold or hot pressure welding, lead to a part in the vicinity of the inlet

are connected to each other. The invention, however, returns to the present day. This particular system

on the basis of plates of tubular channels containing a channel pattern, evaporator plates

described, which are used by hot pressure welding ^for cooling systems, the tubular

will be presented. As is well known, it is common practice for a coolant to flow through channels 2

such plates in cooling systems as evaporator plates, while in the channels 3 an insulated and flexible

to use. The purpose of pulling in the elec-

Trical resistance elements in such plates is related, for the sake of simplicity, previously

it says that a reel 5 can be wound up at predetermined time intervals. The heating element

or to remove frost from these plates. ^me nt consists of a conventional design,

In a known method between ^wob ei a suitable resistance wire 11 with a

two metal sheets to be laid one on top of the other a pattern 45 of suitable heat-conducting electrical insulation 12

a material preventing the welding together is encased.

rials arranged and the sheets attached to each other. In one embodiment, which by collectively to prevent slipping. The weld the above-mentioned aluminum sheets together fastened, superimposed sheets are the said aluminum alloy after the pressing for example, by hot rolling at those 5o welding processes, the radi-districts were which are not due to the sweat-preventing ale width of the röh material accommodating the heating element are separated from each other, confluent channels 3 parallel to the plate 9.5 mm, welds. Depending on the particular use, while the expansion height was 4.5 mm. As purpose of the welded unit can already be noted, it is essential that the electrical Antiperspirant material based on a pattern with a resistance element of a continuous length later the desired system of a conventional flexible and insulated elekvon Channels results. When the Irish heating element is welded together. The element can not separated parts of the unit leads, for example, consist of a chromium-nickel wire, the applied pattern of the antiperspirant that is wound on an asbestos core and that with Material to a non-united part or to layers, 6o a 0.8 mm thick coating of a silicone die is covered between the sheets and between their non-rubber insulation, the total agreed Share lie. These ununited parts are approximately the diameter of the isolated element are then 2.8 mm using a pressure medium. Such wires are common and im readily available commercially for permanent formation of the desired system.

extended by tubular channels. 65 Of course, the special transverse

Welded together sheets can then not be used as space-sectional dimensions of the heating element

heaters or as evaporator plates for cooling systems necessity of the cross-sectional dimensions

and the like. These welded together cavities or tubular channels depend on

5 6

gig, into which the heating elements are drawn, when the fluid around the egg floats

len. According to the invention, it is only necessary that the element flows around and past this and there is a heating element flexible and moves freely through the channels 3 in the channels. If channels 3

is moveable. The cross-sectional dimensions of the heating from the fluid under a relative element must therefore be smaller than the smallest S high pressure flows through, which causes a return flow

Cross-sectional dimensions of the tubular Ka- acts, so it may be necessary to use the heating

nalls. Of the two systems of ducts, element needs to be introduced intermittently into the ducts,

apparently only the pattern 3, in which the heating element so that the flow of the fluid the inter-

to be drawn in, to be shaped, while mid-way inserted portions of the element

the system of channels 2 only after drawing in io through corresponding successive parts of the

of the heating element into the other duct system - ducts 3,

can be shaped. After the heating element is in all channels

When the element is drawn into the tubular shape, it occurs at the outlet 13 of this duct Channels is made of the element in the inlet opening 6 systems, which, as already mentioned, are in the vicinity of the channels 3 through a designated as a whole with 10 15 of the inlet 6, whereby the later attachment A Y-shaped mouthpiece was inserted, consisting of a suitable plug at the ends of the heater straight pipe 7 and a branch pipe 8 be element for connection to a power source, which is connected to the pipe section 7 at point 9. The finished structure with the memorized is. Inserting this mouthpiece into the drawn heating element is an excellent means The inlet of the channels is preferably provided with the aid of 20 for defrosting or defrosting, if the plate is used as a Conventional means an airtight connection is used in refrigeration systems, whereby placed, for example by means of a vice, the ends of the system 2 of tubular channels in which part of the ducts 3 near the inlet are connected to a circulation cooling system, lasses 6 together with the inserted piece of the although in the embodiment the tubular Mouthpiece is clamped so that the mouth 25 channels 2 and 3 lying parallel to each other in derstück are held in the inlet of the channel and at the same time are arranged in the same plane within the plate, The individual duct systems can of course prevent air from escaping at this point will. On the other hand, the mouthpiece can also be at different heights, with each Inlet 6 of the channels 3 are soldered. The one-canal system turns on the opposite side led end of the heating element is necessary to bulge out. Furthermore, the plate 1 can also be with a wisely kept unobstructed and, for example, not provided with individual duct systems into which the with a guide plug or the like. Provided, so that the heating element is drawn in, as shown in FIG. 3 Air flow around the heating element and shown on.

this is not hindered. In this embodiment of the invention, the pipe 8 of the mouthpiece 10 is then a non-35 another plate 14 is made at the branch. The present air hose provided airtight, which leads to plate 14, however, differs from plate 1 of a pressure medium source which, using the previous embodiment, uses conventional means to cause the pressure medium to cause the antiperspirant material to pass through the inlet 6 into the channels 3 is arranged in the form of associated metal sheets so that only pulsating flow flows and a single pattern of tubular channels 15 ge-13 of the channels exits at the outlet end 40. If, for example, the pulsation is generated, which are often tortuous and intermittent, the means whose outlet 16 is near the inlet 17 can only consist of a valve, as in the previous embodiment, which opens and closes to generate this flow is, the mouthpiece 10 is airtightly inserted into the inlet 17 and at certain time intervals either 45 of the tubular channels 15, being mechanically or by hand. Of course, the inlet 18 of the pipe section 7 can be used airtight with air, water, steam and the like in an airtight chamber of a container 19 as the fluid, provided that the fluid is a continuous piece of flexible fluid for the insulation of the heating element is not and insulated electrical heating element 20 is detrimental in shape. Contains a role to achieve the goals of the er-50. Of course, the special pressure required for this invention can be provided in a conventional manner with a special combination of removable cover, whereby the element with the cross-sectional dimensions and the insertion of the heating element and the insertion of the length of the channels, only required is, element through the pipe section 7 of the mouthpiece that the pressure of the fluid in the channels 55 10 in the inlet of the channels 15 is facilitated. After enough to pull the element through the channels to insert the heating element into the container. In the cited embodiment loading and introducing into the inlet of the tubular stand the fluid used from air under gene channels 15, the lid is attached to the container, a pressure of 7 kg / cm ² , intermittently in and on the branch pipe 8 of the mouthpiece 10 is streamed with plate in a 3-second cycle, which 60 means of a suitable connecting part 21 a non-pulsation, as already noted, with the help of the conventional air hose shown, which was achieved to a means, for example by means of a suitable source of a pulsating Flow with the desired cycle described electromatels leads. The pulsating air flow is then in magnetic valve. the plate is embedded and flows around unhindered

Upon admitting the pressurized flow 65 around the heating element through the tubular

in the channels 3 through the mouthpiece channels 15 until the front end 22 of the heating element

The pulsating flow causes the heated material to exit from the outlet 16 of the channels. Through this,

element actually floats in the fluid or that at the end of the pipe part 7 of the mouthpiece 10

an airtight box is provided, a backflow of the fluid and thus the necessity becomes avoided having to insert parts of the heating element intermittently.

On the other hand, the end of the branch pipe 8 can also be inserted into the connecting piece 21 through a pipe Stopper are closed, or the branch pipe 8 can be omitted entirely, with the air hose is connected to a suitable connecting piece 23 which is attached to a wall of the container 19 is provided and through which the fluid is admitted. With this modification it was found necessary to pull the heating element under the action of the fluid flow to hinder in that the heating element is wound on a suitable, not shown spool and this is tensioned using conventional means so that the extent of the Braking against pulling the heating element through the channels can be regulated.

Although all tubular parts in both of the previous embodiments are shown are bulged on both sides of the plates in question with a spherical cross-section, can the invention can of course be applied equally well to tubular channels with other cross-sections Find. For example, the unexpanded preforms produced by pressure welding are expanded between two spaced rigid surfaces so that the tubular Channels received a hexagonal cross-section into which the heating element is drawn. On the other hand, the tubular channels 24 can only face one side according to conventional methods a plate 25 to be expanded and obtained a flattened shape when the expansion takes place between suitable fittings (Fig. 5).

Experts within the scope of the invention can use the exemplary embodiments described above various changes and modifications can be made.

Claims (3)

Patent claims: 1. Method of pulling in a long, flexible and insulated electrical heating element into a hollow body with a continuous, running in several directions, tubular duct expediently made by inflation and having open ends, wherein the heating element is inserted into one of the open ends, namely the inlet opening is and is freely movable in the channel, characterized in that in the inlet opening a pulsating, in particular intermittent air flow is admitted, which during the Drawing in of the heating element unimpeded through the channel around and on the element flows past and has such a pressure that through it the heating element through the channel is pulled. 2. Device for performing the method according to claim 1, characterized by a tubular mouthpiece connected airtight to the inlet opening of the channel through which the Heating element is inserted into the channel, which is at a point approximately in the middle has a pipe branch for admitting the air flow. 3. Device according to claim 2, characterized in that the tubular mouthpiece starts from an airtight chamber which contains the heating element in a wound form and that lying on the mouthpiece at one between the chamber and the inlet opening of the channel Place a sloping branch pipe that lets in air under pressure is provided. Considered publications:
U.S. Patent No. 2,690,002. Legacy Patents Considered:
German Patent No. 1130 537. 1 sheet of drawings 409 768/306 1.65 © Bundesdruckerei Berlin