| 摘要 |
A manual vacuum device is introduced to provide vacuum isolation in a container. The manual vacuum device comprises a lower cover disposed on the container and an upper cover rotatably disposed on the lower cover to form a first air chamber. The lower cover includes a first air channel fluidly communicating the container with the first air chamber and a first check valve disposed within the first air channel to prevent air from flowing back to the container. The upper cover includes a second air channel fluidly communicating the first air chamber with the external environment and a second check valve disposed within the second air channel to prevent air in the external environment from flowing back to the first air chamber. The air in the container exhausts to the external environment by the rotational movement of the upper cover relative to the lower cover.
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