▎ 摘　　要

NOVELTY - The device has a fluid passage assembly provided with a cavity that is provided with fluid passage. The fluid passage has fluid inlet and fluid outlet. A electric heating component comprises a graphene heating unit that is fixed in the cavity to heat the fluid channel. The graphene heating units are provided with an electric connection unit. The electric connection units are adapted to electrically connect with a power supply element. The cavity is formed with a first cavity and a second cavity. The first cavity is connected with the second cavity that are connected with each other. USE - Heating device e.g. heat pipe and steam generator, for use in domestic cooking appliance i.e. cooking appliance. ADVANTAGE - The heat inertia of the heating part is graphene, fast heating speed, capable of quickly heating the fluid, so as to improve the cooking efficiency, enhancing the user experience, besides, the fluid in the fluid channel can be water and/or air. The practicability of heating device is strong, it can realize multiple cooking effect. The cooking appliance cost is reduced, and the market competitiveness of the cooking appliance is improved. The fluid inlet is provided with a proportional valve, to adjust the inlet of the fluid outlet of the water and air ratio. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a cooking appliance. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a heating device. 1Fluid channel assembly 2Heating component 12Fluid channel 13Fluid inlet 14Fluid outlet 100Heating device 121Fixing hole