Box structure heat exchanger

The utility model provides a box structure heat exchanger relates to heat exchange device technical field, including outer heat transfer case body, this internal top -down of outer heat transfer casehas set gradually first baffle and second baffle, be parallel to each other between first baffle and the second baffle, and the cavity is gone up with outer heat transfer case body inside the share tofirst baffle and second baffle, well cavity and lower cavity, the lumen is internal be provided with in heat transfer case body, be the vacuum state between well cavity and the interior heat transfercase body, this internal cross partition board that is provided with of interior heat transfer case, cross partition board falls into four heat exchanging area with interior heat transfer case body,still be provided with a plurality of heat transfer straight tubes in the heat exchanging area, the heat transfer straight tube is the rectangular pipe, the heat transfer straight tube passes interiorheat transfer case body, fir