RU1802917C - Process of manufacture of heating device - Google Patents

Abstract

In the manufacture of a heating device, the resistive element is made of carbon material Uglen, impregnates it with a polymer binder, and cellular electrical insulating material is laid on it on at least one flat side. Then, glass-plastic insulating layers are applied and all layers are pressed at a pressure corresponding to the mode of pressing the cellular material. When the cellular material is made in the form of a honeycomb core based on cellulose, polyamide paper or fiberglass, the specific pressing pressure is selected in the range and, 8 - 3.0 kgf / cm. 1 tab

Description

The invention relates to a method for manufacturing electric heating devices used in construction, electrical, aviation, shipbuilding and other industries, in household appliances for heating and maintaining the required temperature conditions of rooms, units, appliances, and thermostating substances.

The aim of the invention is to increase the stability of the electrical parameters of the heating device and expand its operational capabilities.

In FIG. 1 shows a section through a heating device; in FIG. 2 - a fragment of a heating device of a mesh structure,

The heating device comprises a resistive element 1, a cellular material 2, fiberglass electrical insulating layers 3. conductive busbars and an insert 5.

Example 1. For the manufacture of a heating device, a resistive element made of carbon-filled paper grade T TU 6-05-191-123-78 is used in a known manner. The volumetric resistance of the paper across the width of the sheet in the machine direction is 31-49 ohms. The resistive element was impregnated on an impregnation machine RPM-1000 with phenol-formaldehyde binder BFOS, TU 1-596-113-81 with a density of 0.9 g / cm3 to the following regime: impregnation speed of 2-3 m / min., Temperature in zones 70, 90,100 ° С, a binder content of 50 ± 5%. The insulating layers were made by impregnating T-10-80 GOST 19-170- 73 fiberglass with the same BFOS binder and in the same modes. The binder content is 35-45%. As a cellular material, a PSP-1-3.5-35 TU 1-596-103-82 brand polymerosotoplast with a hexagonal shape of a cell cut into 10 mm high plates was used. From soaked

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resistive element cut blanks of size 840 x 500 mm. fiberglass prepreg 940 x 600 mm. We collected the package in the following sequence:

on a metal sheet laid:

- a layer of release polypropylene film,

- a layer of prepreg fiberglass T-10-80,

- honeycomb core plates in the size of fiberglass prepreg,

- the ends of the honeycomb core were wetted with binder BFOS,

- a layer of prepreg fiberglass,

- a layer of a resistive element symmetrically located relative to the package,

- conductive busbars along the edges of the resistive element at a distance of 840 mm from copper foil with a thickness of 0.1 mm and a width of 10 mm,

- a hollow fiberglass insert was placed around the perimeter of the honeycomb plate,

- no less than 2 layers of impregnated stack: traycan,

- a layer of drainage mylar fabric,

- a layer of polypropylene film,

- metal layer

- a layer of asbestos tissue.

A heat-resistant wire is soldered to the busbars, the installation of which is carried out inside the liner around the perimeter of the heater. The assembled bag was placed between the press plates and pressed at a pressure of 3 kg / cm2, a temperature of 140-160 ° C for 3 hours.

Example 2. The manufacture of the heating device was carried out analogously to example 1, while the pressed package was pressed at a pressure of 1.5 kgf / cm without an intermediate layer of fiberglass prepreg between the resistive element and the honeycomb core.

Example 3. The manufacture of the heating device was carried out analogously to example 1, with the binder used as an epoxy binder EDT-69, and as a cellular filler used fiberglass TSSP-F-UP TU 1-596-259-87 with a cell of 10 mm . The resistive element was placed directly on the honeycomb core. The package was formed using

vacuum molding according to the regime: pressure 0.8 kgf / cm2, temperature 120 130 ° C, curing time 2 hours. The heating device made according to the proposed method has the characteristics shown in the table. :

The proposed method of manufacturing a heating device provides:

- more even distribution

temperature floor., which improves its quality and increases the service life,

- improves the physicomechanical characteristics of the heating device, which makes it possible to use it in various constructions as a structural material, thereby expanding the scope of application.

Claims (2)

1. A method of manufacturing a heating device in which a layer of a resistive element of a conductive material based on carbon is made by impregnating it with a polymer binder and compacted according to the pressing mode of the resistive element, fiberglass electrical insulation layers are applied to it and all layers are pressed at temperature and time modes corresponding to the type of polymer binder, characterized in that, in order to increase the stability of the electrical parameters of the heating device and expand its spluatatsionnyh capacity / before by applying electrically insulating layers to a resistive element, a cellular electrically insulating material and a seal of a resistive eleme are laid on it with an end side at least on one side. The process is carried out during the pressing of all layers at a pressure corresponding to the pressing mode of the cellular material, and the carbon based material is Carbon. 2. A method of manufacturing a heating device according to claim 1, characterized in that, as a cellular material, a honeycomb core based on cellulose, polyamide paper or fiberglass, and the pressing of all layers is carried out at a specific pressure of 0.8-3.0 kgf / cm.