Vacuum slot and fresh -keeping device

The utility model discloses a vacuum slot, include: cushion chamber, float seat, float and spacing portion, the vacuum suction inlet has been seted up at the cushion chamber top for the extraction opening of butt joint evacuation host computer, the cushion chamber lower part is located to the float seat, the gas pocket has been seted up on the float seat, the gas pocket intercommunication the cushion chamber with treat evacuation side, the float is arranged in in the cushion chamber, its position with gas pocket dislocation set and with vacuum suction inlet position corresponds, the float under natural state by the float abutment props, spacing portion locates cushion chamber inner wall or locate on the float seat, it is right to be used for the float is spacing, in order to avoid the float blocks the gas pocket. When the cushion chamber was invaded along with the air current to liquid, because air current speed in the cushion chamber is slowed down, liquid made the float float becausethe dead weight is piled