| 摘要 |
The present invention provides a mouthpiece (10) for a drunkometer which is formed that one end is installed in a drunkometer main body (1) and a testee breathes out to the other end of the drunkometer main body. The mouthpiece (10) comprises: an external pipe body (20) in which expiration pathways (21, 22) are formed along the longitudinal direction inside the mouthpiece (10); introverted protrusion units (30) which are equipped in the center of the inner periphery of the external pipe body (20) and divide into first expiration pathway (21), which connects the expiration pathways (21,22) to the drunkometer main body (1), and second expiration pathway (22), which is connected to mouth of the testee, and in which a flow path (31), which mutually connects the first expiration pathway to the second expiration pathway (21, 22) and has a diameter reduced more than the expiration pathways (21, 22), is formed in the center; and an open and close valve body (40) which is combined with the flow path (31) of the introverted protrusion units (30) as being able to move forward and backward and opens and closes the flow path (31) as being moved forward and backward. If the testee inhales without expiration, the open and close valve body (40) moves forward from the flow path (31) by suction force and closes the flow path (31) in order to prevent the first expiration pathway (21) from being connected to the second expiration pathway (22). |
