Collector tubes are mainly used to collect the refrigerant in branch lines. In the design of condenser and evaporator, many of them will have shunt design. After the high temperature gas refrigerant discharged from the compressor enters the condenser, in order to improve the heat dissipation effect and reduce the pipe resistance, it will be designed into 2~3 channels of shunt for cooling and heat dissipation, and each shunt refrigerant will finally enter a [collector pipe] together, and then enter the expansion valve after convergence.