Nitrogen blow-drying instrument with alarm function

The utility model discloses a nitrogen blow-drying instrument with an alarm function, and relates to the technical field of sample concentration. The device comprises a concentration mechanism, a liquid storage mechanism and a control mechanism, the concentration mechanism comprises a motor and a connecting disc, the liquid storage mechanism comprises a liquid storage cylinder and a fixing plate, the control mechanism comprises a hollow rod and an alarm, the concentration mechanism is fixed at the top end of the liquid storage mechanism, and the control mechanism slides in the liquid storage mechanism. The hollow ball moves downwards along with the liquid level in the liquid storage cylinder, then the hollow rod is driven to move downwards along the round hole, the positive contact rod and the negative contact rod are driven to make contact through downward movement of the hollow rod, and therefore the alarm works to give an alarm; the air passing pipe moves downwards to drive the connecting rod and the conne