NOVELTY - A clearance is provided between the spiral rings of a radiating pipe (1) at a width equal to or greater than 1 mm. The radiating pipe and its inlet and outlet are made from at least one of steel and stainless steel or other materials. A cooling chamber (2) accommodates an inner pipe (3) inside. The inner pipe is disposed inside the spiral rings of the radiating pipe, and has two ends connected with the cooling chamber such that a closed space is formed. The inner pipe and radiating pipe are connected through a bracket such that the radiating pipe is fixed.    USE - Liquid cooled heat exchanger with spiral structure for decreasing temperature of gas-liquid mixture after hydrogen and oxygen production using water electrolysis.    ADVANTAGE - Avoids corrosion of equipment. Provides satisfactory radiating effect with small number of environmental requirements.    DETAILED DESCRIPTION - A peripheral equipment has an outlet of an electrolyte tank and an inlet of a gas-liquid separator. The cooling chamber is defined by a closed container having two ends separately provided with an inlet (7) and an outlet (8). The inlet is lower than the outlet. The upper and lower ends of the cooling chamber are provided with through holes. The radiating pipe is disposed inside the cooling chamber. An inlet and an outlet of the radiating pipe are extended outside the cooling chamber through the through holes of the cooling chamber, and are in sealed connection with the through holes. The inlet of the radiating pipe is connected with the outlet of the electrolyte tank, and the outlet of the radiating pipe is connected with the inlet of the gas-liquid separator. The radiating pipe is corrugated on the inner and outer surfaces. A part of the radiating pipe and the inside of the cooling chamber are spiral. The spiral structure of the radiating pipe is disposed between the inlet and the outlet of the cooling chamber. The internal diameter of a spiral ring of the radiating pipe is controlled to be 150-300 mm. The thickness of a wall of the radiating pipe is controlled to be 3-15 mm. The internal diameter of the radiating pipe is controlled to be 12-20 mm.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the liquid cooled heat exchanger with a spiral structure.    Radiating pipe (1)    Cooling chamber (2)    Inner pipe (3)    Inlet (7)    Outlet (8)