A magnet drive rotary vane pump has a casing with a pump cavity. A rotor carrying a plurality of vanes is disposed within the pump cavity to be rotatable about an eccentric axis with respect to the pump cavity for drawing the fluid into the pump cavity and expelling it out of the pump cavity.Vacuum pumps The rotor is configured to have a rotor magnet which is magnetically coupled to a stator magnet mounted on the casing outwardly of the pump cavity for driving the rotor. The rotor magnet is configured to have its major portion disposed in an overlapping relation with the stator magnet. Magnetic pumpsThus, the rotor magnet can be mechanically isolated from the stator magnet disposed outside of the casing to establish a sealless coupling therebetween for realizing leakage free pump.  A magnet drive vane pump comprising: a casing with a pump cavity, an inlet for introducing a fluid into said pump cavity, and an outlet for discharging the fluid out of said pump cavity; a rotor disposed within said pump cavity to be rotatable about an eccentric axis eccentric to an axis of said pump cavity, said rotor carrying a plurality of vanes which are configured to move radially so as to be kept in sealed contact with an interior wall of said pump cavity as said rotor rotates, said rotor is configured to have a rotor magnet; a stator magnet mounted to said casing outwardly of said pump cavity and magnetically coupled to said rotor magnet for driving said rotor to rotate; wherein said rotor magnet is configured to have its major portion disposed in an overlapping relation with said stator magnet with respect to a radial direction about said eccentric axis. Vane pumps are widely known in the art, for example, as disclosed in Japanese patent publication No. 53-2704 A. Generally, the vane pump includes a casing with a pump cavity and a rotor rotatable about an eccentric axis within the pump cavity. The rotor carries a plurality of vanes which moves radially so as to have their outer ends kept in sealed contact with an interior wall of the pump cavity as the rotor rotates, thereby drawing a fluid into the pump cavity, compressing and expelling it out of the pump cavity. The rotor is coupled to an external motor to be driven thereby to rotate. For this purpose, the rotor is provided with a shaft which extends outwardly of the casing for coupling with the motor. Therefore, a sealing is between the shaft and the casing. However, as the shaft is a constantly moving part, there is always a problem that the sealing may become deteriorated during an extended period of use to result in an unintended lead of the fluid.

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2012-01-06

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