Patent ID: 9028681
Filing Date: 2015-05-12
Classification: B01D,E03F,F04B

Abstract:
1. A drainage device for draining liquid out of a closed chamber, comprising: a main body defining a receiving chamber and a liquid inlet communicating with the receiving chamber to the closed chamber; a piston assembly fixed in the receiving chamber of the main body, the piston assembly comprising a fixed piston and a flexible member located at a side of the fixed piston away from the liquid inlet, the fixed piston defining a plurality of permeable holes, the flexible member configured to deform under liquid pressure in the closed chamber; a transmission assembly partially received in the receiving chamber, the transmission assembly and the piston assembly cooperatively separating the receiving chamber into a first chamber adjacent to the liquid inlet and a second chamber away from the liquid inlet, the transmission assembly comprising an action piston and a flexible member located at a side of the action piston away from the piston assembly, the action piston defining a plurality of permeable holes, the action piston of the transmission assembly substantially cylindrical and comprising a top surface and a sealing surface, the sealing surface providing a moving seal against a sidewall of the main body, the flexible member of the transmission assembly attached to the top surface of the action piston, the flexible member having a waterproof surface away from the top surface and a sealing surface touching the sidewall of the main body, the flexible member of the transmission assembly configured to deform under liquid pressure in the first chamber; wherein the flexible member of the transmission assembly is a silicone mat, the transmission assembly is slidably received in the receiving chamber, thereby adjusting air pressure in the first chamber and the second chamber, to pump the liquid from the closed chamber to the first chamber, and then pump the liquid from the first chamber to the second chamber, and the main body further defines at least one discharge hole for draining liquid out of the second chamber.