FIELD: heating.
SUBSTANCE: disclosed is a heating unit for staged heating, which comprises a heating circuit and electrodes; heating circuit comprises part of pre-heating of flat structure, buried in porous element for transfer of liquid, and a spraying part of the flat structure fixed on the spraying surface of the porous liquid transfer member or inserted therein; preheating part and spraying part are connected in parallel between electrodes, spraying part and preheating part are connected partially in parallel, wherein two ends of spraying part are connected to electrodes by means of electrode contacts, respectively, and part of preheating is connected in parallel with at least one section of spraying part by means of transition parts; part of preheating and spraying part are located one above the other, as a result of which their projections are completely overlapped; and at least the spraying part is an integral structure and corresponds in shape and size to the spraying surface of the porous liquid transfer element and is identical thereto, note here that preheating part and spraying part are made integral to form integral structure.
EFFECT: invention makes it possible to reduce the problem consisting in a small amount of smoke at the beginning of work, or to avoid it, as well as to achieve the effect of uniform spraying without increasing micropores or reducing heat.
6 cl, 18 dwg
