Silencer

A silencer, characterized by comprising:

• a main air guide tube provided with an air guide channel, the main air guide tube comprising an air inlet end and an air outlet end away from the air inlet end;
• and
• an assistant air guide tube, both ends of the assistant air guide tube being connected with an outer wall of the main air guide tube, and the assistant air guide tube comprising a guide section and a reflux section communicated with each other;
• an end of the guide section away from the reflux section being provided with an air inlet, and the air inlet being communicated with the air guide channel;
• an end of the reflux section away from the guide section being provided with an air outlet, and the air outlet being communicated with the air guide channel;
• and a separation distance between the air outlet and the air inlet end being greater than that between the air inlet and the air inlet end;
• wherein an air flow may enter the air guide channel from the air inlet end and is divided into a first branch flow and a second branch flow when flowing through the air inlet;
• the first branch flow flows to the air outlet end continuously along the air guide channel;
• the second branch flow enters from the air inlet, and is exhausted from the air outlet along the assistant air guide tube and comes together with the first branch flow;
• and a flow direction of the second branch flow flowing out of the air outlet is opposite to that of the first branch flow.