Patent ID: 8714155

Claim:
A liquid trap assembly, comprising: a multi-necked adapter tube with a gas-inlet adapter tube, a gas-outlet adapter tube and a liquid-outlet adapter tube, in which the liquid-outlet adapter tube has an expanded-plate structure that is combined with a liquid trap cup to form a seal structure, a valve structure to open or close the liquid-outlet adapter tube, the liquid trap cup, embodied in a liquid trap device of a breathing circuit and comprises: a hollow cup tube with an upper portion and a lower portion; a piston element with a top portion and a tail portion, which is arranged airtight in the lower portion and is movable between a start point and an end point of the lower portion; and a liquid discharge structure, which is arranged on a sidewall of the lower portion and between the start point and the end point, and communicates with the lower portion, wherein the liquid-outlet adapter tube has an upper adapter tube and a lower adapter tube, and a blocking structure between the upper adapter tube and the lower adapter tube; the valve structure has a valve end and a tail and is substantially coaxial with the piston element, the valve end is embedded in the upper adapter tube by the blocking structure; and during the trapping of liquid, an end of the valve tail comes into contact with the top of the piston element so as to open the liquid-outlet adapter tube and separate the upper portion and the lower portion of the hollow tube of the liquid trap cup.