Double-chamber negative pressure adjusting device

The double-chamber negative pressure adjusting device comprises a case back sealing air inlet baffle, a cover chamber air inlet air quantity control hole formed in the upper portion of the air inlet baffle, a cabin air inlet air quantity control hole formed in the lower portion of the air inlet baffle, a cover chamber air pipe connector fixed to the back face of the air inlet baffle and communicated with an isolation door cover chamber through a cover chamber air pipe. The end hole diameter of the cover chamber air pipe connector covers the cover chamber air inlet air volume control hole, a cabin air pipe connector is fixed to the back face of the air inlet baffle and communicated with the sealed cabin through a cabin air pipe, and the end hole diameter of the cabin air pipe connector covers the cabin air inlet air volume control hole. A fixed plate parallel to the air inlet baffle is fixed in the case, a cover chamber air inlet adjusting module is fixed at the upper part of the fixed plate, a cabin air inlet