Film heater

 

(57) Abstract:

The invention relates to flat heaters of the radiant type, in particular for film heaters used for heating of domestic and industrial premises. The device comprises a planar zigzag form resistive radiating element foil located between two flexible heat-resistant insulating films. Resistive radiating element is made of an amorphous alloy of metals or of metals (transition) with the metalloids. The heater has a high mechanical strength, high efficiency and reliability. 3 Il.

Patentable invention relates to flat heaters of the radiant type, in particular for film heaters used for heating of domestic and industrial premises.

Known heating and insulation module /see application EPO N 0116788, CL NW 3/14, 3/36, 1984/, which is designed to obtain ceilings, providing heating radiation. The module contains a heater formed by heating the film to be fixed to the surface of the insulating layer, which simultaneously performs the additional function is actionscene contacts connected to the power bus. In General, the module design is hard, which reduces its consumer properties, and the resistive element is made in the form of a conductive layer, almost completely covering the surface of the film, and is made on the basis of tin-armano-lead alloy, which leads to the high cost of the module.

Known flexible electric heater, secure and. C. the USSR N 377977, CL NW 3/14, in which the conductive material is graphite cloth, protected by insulating rubber layer. The heater due to the flexibility of convenient to use, because they can cover not only a flat surface but with a more complex topography. However, carbon-graphite cloth poorly connected with a rubber membrane, which leads to the presence of air bubbles, significantly reducing technical characteristics of the heater. Enter in graphite fabric sulfur to increase the bond strength between the fabric and the rubber sheath with one hand significantly increases the cost of manufacture of the heater, because the necessary refined sulphur, on the other hand, a positive result is difficult to achieve because it is difficult to provide a homogeneous composition of carbon fabric. In addition to the>

From the description to the Japan patent N 53-27496, CL NW 3/14, 1978 known flat heating element with radiation from one surface. It consists of a transparent heat insulating film /Teflon, polyester resin/, where zigzag resistive element made of aluminum or tin foil. The resistive element is faced with the "working" side of another film of synthetic transparent heat-resistant resin with a negative temperature coefficient of resistance /polyvinyl chloride, polyamide/, in turn, covered with aluminum or steel foil, which acts as a screen.

The heater has good heat radiating properties, high efficiency, because energy loss radiation is minimized due to the successful combination of materials used. However, it is costly because first, the resistive element is made of tin, which also has a low strength, and secondly, because of the more complicated the design, including reflective screens. Their use increases the cost of production, complicates the technology of Assembly and increases the weight of the heater.

As a prototype by the applicant accepted film heater for systemset a tape resistive element /foil/ from tin-lead-Sarmanovo alloy, which zigzag is located between two flexible insulating plates, each of which is double-layered. The inner layer adjacent to the resistive element made of plastic film and outside of the polyester. The resistive element has landroversnow form, its parallel sections /strips/ sequentially interconnected bridges. The heater is equipped with pins connect to the mains voltage of 220 C.

Despite the fact that the heater is made of a composition with a low content of tin /52%/ and is cheaper than, for example, a film heater on the application Germany N 2705472, CL NW 3/14, which contains 61.5% of tin /mass/, the cost remains high.

Another disadvantage is the low mechanical reliability of the resistive element of the device, due to the properties of the materials used for its manufacture. Foil based on tin and lead with an additive antimony has a voltage limit on the gap to 20 kPa/mm2when the thickness of the foil up to 0.45 mm

In addition, the alloy is very brittle and when it bends easily destroyed. Therefore, for protection from damage resistive element PR is awn known foil is reflected in the performance of the heater. In particular, for providing operating power, adopted in industry to 150 300 watts, when the thickness of the foil 7 25 microns module heater comes with the emission area of not less than 1 m2a series connection of resistive elements. Reduction of the overall dimensions of the module heater necessitates increasing the thickness of the foil to maintain the required power, hence the overuse of expensive metals.

The goal in the famous film heater containing planar zigzag form resistive radiating element foil located between two flexible heat-resistant insulating film and is provided with leads for connection to the electrical network, is achieved by the fact that the foil is made of an amorphous alloy of metals, or transition metals and metalloids.

By performing a foil of amorphous alloys of metals or transition metals metalloids, due to their higher strength /yield stress at rupture of the foil of an amorphous alloy 600 times higher than that of the foil of tin-lead-antimonic alloy/, the heater can be made with a thinner insulating films and the reliability and to reduce its cost.

In Fig. 1 shows a General view of a film heater; Fig. 2 is a section along AA of Fig. 1; Fig. scheme 3 connect multiple heaters.

Film heater contains two sheets of flexible heat-resistant insulating film 1, which can be used polyethylene terephthalate laminated film on THE 6-49-5761783-334-90, between which is placed resistive emitting element 2 foil of amorphous alloy metals or transition metals metalloids /for example, one of the alloys of amorphous ribbon on THE 14-1-4971-91/. Resistive element 2 has a zigzag shape, for example in the form of strips, sequentially interconnected by crosspieces 3, forming in the plan meander shape. The element 2 is provided with pins /in Fig. not shown/ to connect to the connecting wires 4, which are supplied with plug for connection to the mains power supply, or have a free end for connection in parallel of several heaters /Fig. 3/.

The edges of the heater should be patched with tape 5. Experienced the heater size in terms 750x1450 mm and a thickness of 150 μm, formed from 2 sheets of the above-mentioned film thickness of 60 μm and with a resistive illocos/, has radiated power within 125 150 W/m2the surface temperature within 40 65oC, the resistivity 32040 Ohms, the specific weight of about 350 g/m2if the mass of the resistive element 95,

When using film heater for heating, for example, offices collect a few heaters on the circuit of Fig. 3, forming the heating panel /ceiling, wall, sexual or other/. The panel is fixed on the ceiling /wall, floor/ glue, nails, screws, etc. and, if necessary, revet, for example, particle Board or gypsum boards, General electric output 6 panel supply or electrical connector, or connect to the switch /Fig. not shown/.

The heater works as follows.

When connecting it to the mains resistive element heats up and radiates heat into the atmosphere of the room. Loss of energy due to the reduced thickness of the insulating tape is minimized, which determines the high efficiency of the heater.

Due to the increased mechanical strength of the resistive element increases the reliability of the electric heater and can the items of furniture, including three-dimensional form.

Film heater containing planar zigzag form resistive radiating element foil located between two flexible heat-resistant insulating film and is provided with leads for connection to the electrical network, wherein the foil is made of an amorphous alloy of metals, or transition metals and metalloids.

 

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