Abstract: A silencer comprises a main air guide tube provided with an air guide channel; the main air guide tube comprises an air inlet end and an air outlet end; both ends of an assistant air guide tube are connected with an outer wall of the main air guide tube, and the assistant air guide tube comprises a guide section and a reflux section; the guide section is provided with an air inlet, and the air inlet is communicated with the air guide channel; the reflux section is provided with an air outlet, and the air outlet is communicated with the air guide channel.

Abstract: The present invention provides an exhaustion pipe in the mechanical field. The exhaustion pipe of the invention comprises a casing, on the sidewall of which a plurality of ventilation through holes are provided; and a cooling pipe mounted within the housing, which includes a heat dissipative air inlet end and a heat dissipative air outlet end, and on the sidewall of which a plurality of heart dissipative ventilation holes are provided. The exhaustion pipe has advantages including a simple structure, a rapid cooling effect and good safety performance.

Abstract: The present invention provides an exhaustion pipe in the mechanical field. The exhaustion pipe of the invention comprises a casing, on the sidewall of which a plurality of ventilation through holes are provided; and a cooling pipe mounted within the housing, which includes a heat dissipative air inlet end and a heat dissipative air outlet end, and on the sidewall of which a plurality of heart dissipative ventilation holes are provided. The exhaustion pipe has advantages including a simple structure, a rapid cooling effect and good safety performance.