Air suction system

The utility model relates to an air suction system, which relates to an air suction device, in particular to an air suction device for a concentrated mixing tank. The air suction system is arranged on the concentrated mixing tank and comprises a suction fan, an air pipe, a one-way valve and a water tank;, wherein the air pipe is connected with the concentrated mixing tank; and the suction fan and the one-way valve are both arranged on the air pipe. The air suction system is characterized in that a cooler is further arranged at the position of the air pipe, close to an outlet of the air pipe; the cooler is provided with a cleaning joint; and an outlet of the air pipe is provided with a water receiving tank. The air suction system has a simple structure and reasonable design, and can effectively avoid the contamination of drug liquid and the quality affection of drugs caused by condensation and reflow of steam; active carbon in air is filtered to reduce the environmental pollution caused by directly emitting fl