The utility model relates to frozen equipment technical field, concretely relates to a turnover vacuum precooling device, including the freezing storehouse, the left side rotation of freezing storehouse is connected with the door
plant, the front end fixed connection of freezing storehouse has the control panel, the upper end of freezing storehouse is equipped with the freezing
assembly, the inside of freezing storehouse is equipped with the space change mechanism, the space change mechanism includes the hydraulic rod fixed connection in the right side of freezing storehouse, a plurality of the output fixed connection of hydraulic rod has the moving plate, the inside fixed connection of moving plate has the cylinder, the left side of cylinder is equipped with the round hole, through the air
pressure reduction of freezing storehouse inside, make
piston block drive support rod, and then make rubber block can closely with the inner wall of freezing storehouse and adhere, can improve the friction of moving plate and freezing storehouse, make moving plate be in
stable state, can improve the sealing between moving plate and freezing storehouse simultaneously, change the space of freezing storehouse working cavity, and then the
refrigeration efficiency is higher.