DC 12V vacuun freshing keeping box piston pump

How does the mini piston pump work in the vacuum preservation machine? The working principle of the piston pump in the vacuum preservation machine is to continuously extract the air in the preservation chamber through the reciprocating motion of the piston to maintain the vacuum state. when the piston goes up When moving, the air in the fresh-keeping chamber is sucked into the pump, and then when it moves downward, the air is discharged out of the pump through the exhaust port, thereby forming a certain vacuum environment in the fresh-keeping chamber. Specifically, the working process of the mini piston air pump in the vacuum preservation machine is as follows: 1. The piston moves downward, and the suction port opens, allowing external low-pressure gas to be sucked into the pump body. 2. After the piston reaches the lowest point, the suction inlet is sealed, and a low pressure area is formed in the pump body. 3. The piston moves upward, and the sealing ring th…