Plate heat exchanger for heating and ventilation

The invention relates to the technical field of plate heat exchangers, and discloses a plate heat exchanger for heating and ventilation, which comprises heat exchanger sheets and a fixing frame for clamping a plurality of groups of heat exchange sheets, and a fixing assembly for fixing the plurality of groups of heat exchange sheets is fixedly assembled on the outer wall of the fixing frame. A plurality of screw main bodies in the same rotating direction are rotated to one end of a sheet fixing part for fixing a heat exchange sheet in a damaged state, and a plurality of screw main bodies in the other rotating direction are rotated to the other end of the sheet fixing part for fixing the heat exchange sheet in the damaged state; one group of sheet fixing parts used for fixing the heat exchange sheet in a damaged state and the oppositely arranged screw main body are in a disengaged state, and the other plurality of sheet fixing parts and the screw main body are kept in a threaded connection state; the problem t