Three-phase electrothermal film
An electric heating film, phase electric technology, applied in electric heating devices, ohmic resistance heating, ohmic resistance heating parts and other directions, can solve problems such as affecting the three-phase balance, improve the safety of use, reduce power density, and prolong the safety of use. sexual effect
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Embodiment 1
[0063] See figure 1 and figure 2 , the present embodiment 1 is a three-phase three-wire single-sheet three-phase electric heating film, and the three-phase load is connected in star form. The three-phase electrothermal film in this embodiment 1 includes an upper insulating layer 1 , a heating core layer 2 , a lower insulating layer 3 and an electrical connecting sheet assembly 4 . The materials of the upper insulating layer 1 and the lower insulating layer 3 are the same PET (PET is the abbreviation of Polyethylene terephthalate in English, PET or PETP for short) or PI (PI is the abbreviation of Polyimide in English, and PI is commonly known as polyimide in Chinese, which is a molecular structure containing amide Aromatic heterocyclic polymer compound of imine group) or epoxy resin material. Corresponding parts of the upper insulating layer 1 are fixed on the lower insulating layer 3 by hot-melt adhesive thermocompression bonding from top to bottom, and the heating core lay...
Embodiment 2）
[0067] See image 3 , This embodiment 2 is a three-phase three-wire sheet-type three-phase electric heating film. The rest of this embodiment is the same as that of Embodiment 1, the difference being: U-phase conductive heating strip 21, V-phase conductive heating strip 22, and W-phase conductive heating strip 23, which are located in the middle of the electrothermal film. The spacing between them is always consistent, and the spacing between the parts on the left and right sides that are parallel to each other decreases from the inside to the outside.
Embodiment 3）
[0069] See Figure 4 , the present embodiment 3 is a three-phase three-wire continuous tension type three-phase electric heating film. The rest of this embodiment is the same as that of Embodiment 1, except that the lower insulating layer 3 is provided with a U-phase printing part 3-1, a V-phase printing part 3-2 and a W-phase printing part 3- 3. The heating core layer 2 also includes an electrically connected heating strip 25 . The electrically connected heating strips 25 are continuously arranged along the rear edges of the U-phase printed part 3-1, the V-phase printed part 3-2 and the W-phase printed part 3-3.
[0070] Each of the U-phase printing part 3-1, the V-phase printing part 3-2 and the W-phase printing part 3-3 is provided with a U-phase connecting part 21-1, a V-phase connecting part 22-1 and a W-phase connecting part 23-1.
[0071] The U-phase conductive heating strips 21 are arranged in an S-shape on the U-phase printing part 3-1. The head end of the U-phase...
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