The heat exchanger of the JM-H series mechanical seal auxiliary system adopts the coil structure, with a large thermal conduction area, which can better transfer part of the heat of the thermal fluid to the cold fluid, and the cooling effect of the coolant is more obvious, providing a better working environment for the mechanical seal. It was mainly used in the API682 washing protocol PLAN21,23, etc. Widely used in petroleum, chemical industry, power, light industry, machinery, metallurgy, transportation, pharmaceutical and other fields.