Heat exchange device

The utility model provides a heat exchange device, includes: casing, setting are in what the casing was interior takes the fan of fan air outlet and fan air intake and heat exchange plain young, sets up to be in casing wind gap on the casing, be equipped with one end with the joint that the casing wind gap is connected, the joint comprises the pipe connection portion of the different diameters of more than one, leaves the nearest pipe connection portion in casing wind gap is first pipe connection portion, and leaves casing wind gap pipe connection portion the farthest away is second pipe connection portion, the diameter of the diameter ratio second pipe connection portion of first pipe connection portion is big set up heat preservation portion material in the joint, be equipped with the ventilation wind path that makes the air pass through in the heat preservation portion material. The utility model has the advantages of, prevent the dewfall production, the security that improves the product.