Patent ID: 8858189
Filing Date: 2014-10-14
Classification: F04B,Y10T

Abstract:
1. A pumping device, comprising: a barrel; a top cover mounted on a top of the barrel; a tap removably mounted on an open top of the top cover; a switching valve mounted on the top cover to control connection between the barrel and the top cover; a cylinder mounted in the barrel and connected to the top cover; a piston movably mounted in the cylinder; a plurality of check valves mounted on the piston; a connecting unit mounted on the barrel and connected between the top cover and the cylinder; an operation unit mounted on the top cover and connected with the piston; and a delivery unit mounted on the top cover and connected to the barrel; wherein the barrel has an interior provided with a receiving chamber; the top cover has an interior provided with a flow channel and has a central portion provided with a shaft hole connected between the flow channel and the cylinder; the flow channel of the top cover has an upper portion provided with a drain hole connected to an ambient environment through the top cover; the flow channel of the top cover has a lower portion provided with a first connecting hole connected between the flow channel and the connecting unit and a second connecting hole connected between the flow channel and the receiving chamber of the barrel; the switching valve is mounted on the flow channel of the top cover and includes: a valve stem movably mounted in the flow channel of the top cover; a plurality of gaskets mounted on the valve stem; a plurality of connecting grooves formed between the gaskets; the valve stem of the switching valve has an interior provided with a through hole connected between the flow channel of the top cover and the connecting grooves; the connecting grooves of the switching valve are connected to the drain hole, the first connecting hole and the second connecting hole of the top cover respectively; the cylinder is received in the receiving chamber of the barrel and has an interior provided with a piston chamber connected between the shaft hole of the top cover and the connecting unit; the operation unit includes a propeller shaft movably mounted in the piston chamber of the cylinder and connected with the piston to move the piston; the connecting unit includes: a tube connected with the cylinder and having a connecting port connected to the piston chamber of the cylinder; and a conduit having a lower end connected to the tube and an upper end connected to the top cover.