Thermos flask

Abstract

The present invention discloses a vacuum flask with a lid and a central pressure switch, which prevents splashing and incorrect installation, comprising a flask body and a lid, wherein the lid comprises an upper cover, a sliding switch, a central pressure switch and an inner stopper, wherein a combined sealing ring is provided on the lower part of the inner stopper, wherein an annular projection and an extension are formed on the upper part and the lower part of the combined sealing ring respectively, wherein when the lid is connected to the flask opening part of the flask body, the annular projection rests tightly against the inside of the flask opening part and the extension rests tightly against a rib on the inner wall of the flask opening part;wherein the can opening part is provided with a positioning lock which interacts with the slide switch, wherein an annular shoulder with a positioning channel is provided on the inner stopper in which a latch of the slide switch is arranged during installation, wherein a discharge channel wall is formed on the inner wall of the can opening part associated with the spout, wherein the side surface of the annular shoulder is adapted in its shape to the corresponding area of ​​the discharge channel wall. The invention is simple in design, easy to assemble and can prevent splashing and incorrect installation by means of the design of the combined sealing ring and the annular shoulder.

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