Freezing tunnel drainage system

The utility model belongs to the technical field of refrigeration equipment, concretely relates to freezing tunnel drainage system. The drainage pipe who is provided with the outlet and links to eachother with the outlet in the bottom in freezing tunnel, its characterized in that adds between outlet and drainage pipe and establishes U type pipe. U type pipe outer around the winding have the heating resistor silk, winding or cladding have an insulating seal material on the heating resistor silk, are provided with the drain valve in the least significant end of U type pipe. The utility model provides a freezing tunnel drainage system, it establishes U type pipe to add in the middle of outlet and drainage pipe, can play the liquid seal effect, avoid gaseous in the freezing tunnel and directly carry out substance exchange and energy exchange with the interior gas of drainage pipe, can effectively keep gaseous cleanliness in the freezing tunnel, U type outside of tubes is established the heating resistor silk and