The utility model relates to an improved blowing tube structure of a wine detector.There is a concave part in the upper shell.One side of the concave part is provided with an air blowing pipe protruding outwards.And a top stop close to the blowing pipe,In addition, the preset upper concave part of the lower shell can be combined with the lower concave part of the upper shell to form a middle empty shell.The lower shell is provided with an exhaust pipe protruding reversely with the air blowing pipe.And a detecting air pipe connected with a preset alcohol detector.The bottom surface of the upper concave part is provided with a lower stop part at the position corresponding to the upper stop part.A check valve piece is arranged on one side of the hollow shell which is close to and receivesLower stop block,When the air flows from the blowing pipe to the hollow shell,The air flow pushes the check valve piece and flows into the middle empty shell through the peripheral side.Part of the air flow is detected to flow into the wine detector.The rest of the air flows out through the exhaust pipe.If the air flows out of the blowing pipe,The air flow will drive the check valve plate to block the blow pipe.So that the air flow cannot flow into the blowing pipe.一種酒測器之吹管改良結構，係於一上殼內設有下凹部，該下凹部一側設有向外凸伸的吹氣管，及一接近該吹氣管的上擋止部，另以一下殼預設的上凹部可與該上殼的下凹部相結合成一中空殼體，該下殼具有一與該吹氣管反向凸伸之排氣管，以及一與預設酒測器相連結之偵測氣管，該上凹部底面對應於該上擋止部的部位設有一下擋止部，一逆止閥片設置於該中空殼體接近該吹氣管的一旁側且受該上、下擋止部阻擋，當空氣由吹氣管流向該中空殼體，則氣流推動該逆止閥片並由周側通過流入該中空殼體內，部份氣流係經偵測氣管流入該酒測器內，其餘氣流則經排氣管向外流出，而若空氣由吹氣管流向外，則氣流會驅使該逆止閥片阻擋於該吹氣管，使該氣流無法流向吹氣管內。
