The utility model relates to a built-in
cooling coil pipe which comprises a speed
reducer shell, a coil
pipe body and a connecting
assembly, the coil
pipe body and the connecting
assembly are arranged in the speed
reducer shell, a connector of the coil pipe body is fixedly connected with the connecting
assembly, an installation hole is formed in the speed
reducer shell, and the connecting assembly comprises a
flange and a flaring type pipe connector. One end of the flaring type pipe joint is fixedly connected with the joint of the coil pipe main body, and the other end of the flaring type pipe joint sequentially penetrates through the mounting hole of the speed reducer shell, the sealing ring and the
flange and then is fixed on the speed reducer shell through the hexagonal thin nut. A special
cold area coil pipe structural design is adopted, a
cooling coil pipe is placed in a box body, a gear in the box body is avoided, a motor pump and an external
plate heat exchanger are omitted, a transition connector is installed in the box body, and the other end of the
cooling coil pipe is installed in a concave position of the box body through a special cooling coil pipe structure, so that the stability of the device is guaranteed, and the service life of the device is prolonged. Finally, the purposes of
cooling effect,
low noise, light weight and small size are achieved.