An automatic thermostat is mainly composed of double cup, thermos cup, cup sleeve (1) heating device (2), a cup fixing piece (3), (4) fixing device, temperature control device (5), which is characterized in that: the two cylindrical stainless steel thermos cup (1) is inserted in the cup the heating device (2) containing space (24), the insulation Cup (1) of the container (11) mounted on the bottom and a cup cover (23) on the insulation heat transfer round porcelain plate (231) is in contact with the porcelain insulation heat transfer (231) is arranged below the heating film circle (232) and, through the adhesive (233) and a cup cover (23) adhesive, the heating film (232) temperature sensing chip and below it device (51) through the wire (234) and the temperature control device (5) in the control line Plate (57) is connected with the temperature control device (5) mounted on the cup heating device (2) of the short side, the cup cover heating device (2) through the cup cover (23) connecting bayonet (235) and the cup cover fixing piece (3) is connected through the cup set a (3) three fixed gap screw of the fixing device (31) and (4) fixed on a steel sheet (45) through hole (48) is connected with a fixed steel sheet (45) on the limiting device (46) limit, fixing device (4) through the cone (42) the whereabouts of the push, the top column (41) along the column top guide hole (47) slide against the body, and is fixed by screws (43) of the cone (42) fixed, fixed device (4) is connected with the body.
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