The invention covers a resistant heating element which is to be applied mainly to heat gases and liquids.

There are resistant heating elements in the form of spirals used to heat rooms. The spirals are made of resistance wires and fitted into casings. The devices are used to heat rooms with a stream of warm air heated with the heating element which warms up as a result of the current flowing through it and the flowing air collects heat from the heating element.

Description RU2308822 shows a heating element in the form of a rectangular panel made of canals with the hexagonal section. Plates are glued to the narrow sides of the panel with a gluing compound made of the same substance as the panel so that the space of the last rows of openings is filled in with the compound. The gluing compound of the last plate contains contacts to which electricity is supplied. In this solution, the contacts supplying electricity heat up to the temperature of the heating element and when turned on several times, the contacts heat up to such a high temperature that they stop functioning and stop performing their function.

The resistant heating element, preferably in the form of a rectangular prism, with through openings located parallel to each other, in the invention is characterised by the fact that the external walls of the element, in contact with the clamps supplying electricity, are thicker than the other walls of the element, and the thickness of the external walls is equivalent to 1 ,25 to 3 times the thickness of the other walls. It is preferable that the external walls, at the sides in contact with the clamps supplying electricity, contain a well conductive coat. The coat may be of metal; it is preferable that the coat on the surface of the external walls has been electroplated. I he electroplated coat of a good conducive material, for instance of copper, increases the conductivity of the fragment of the resistant element and restricts the heating of the wall to which electricity to the element is supplied. Additionally, the thicker wall in contact with the clamps supplying electricity to the resistant element also prevents overheating of the contact place with the power supply clamps. The effect of the solution is that during operation, the temperature of the coated fragments is lower than the temperature of the other parts of the heating element.

There is a solution whereby all walls of the first rows of the openings are coated with a well conducive metal. Coating of the surfaces of the walls making up the rows of openings enlarges the zones with a lower temperature of the element. The zones are favourable due to connection to the electricity supplying clamps.

The invention is presented in exemplary executions in which in fig. 1 it presents a perspective view of the heating clement, fig. 2 - top view, fig. 3 - an enlarged fragment from fig. 1 with a view of the clamps supplying electricity, fig. 4 - bottom view of the heater with fitted resistant heating elements, fig. 5 - view of heating elements fitted in the heater, fig. 6 - perspective view of the heating element with openings with a hexagonal outline, fig. 7 - top view of the element from fig. 6, fig. 8 - an enlarged fragment from fig. 6, and fig. 9 - side view of the element from fig. 6.

The resistant heating element 1 is a rectangular prism with a rectangular base and contains openings 2 with square section, located perpendicular to the base of the rectangular prism. The thickness g2 of the external walls 3 on the shorter sides of the rectangular base are 1.5 times thicker than the thickness g1 of the other walls of the heating element. The heating element is made of a composite containing 24% dry mass of graphite and 76% of silty mineral in the form of kaolin.

The external surfaces of the walls 3 in contact with the clamps 4 supplying electricity and the surfaces of the walls of the first rows of openings on the shorter sides of the rectangular base are electroplated with copper. In the solution presented in fig. 6, fig. 7, fig. 8 ana Tig. y - tne neating element 1a is a rectangular prism with openings 2a with a hexagonal outline. The sides 3 to which electrical current is connected is covered with a metallic coat P up to the height of one row of openings 2a.

The increased thickness g2 of the external walls 3 in relation to the thickness g1 of the other walls of the heating element restricts the beating of the walls to which electricity is supplied to the element and prevents overheating of the place of contact with the electricity supplying clamps. The electroplated coat of a copper increases the conductivity of the fragment of the resistant element and restricts the heating of the wall to which electricity to the element is supplied. *file effect of the solution is that during operation, the temperature of the coated fragments P is lower than the temperature of the other parts of the heating element.

Fig. 4 and fig. 5 present the resistant heating elements 1 fitted in heater 5 which is made of thin walls fitted on legs and has a form similar to a rectangular prism without a bottom with all outlet opening 6 located at an angle to the vertical plane. The resistant heating elements warm up the air that flows around their walls and the air gets out with an outflow opening 6.