Magnetic drive pump

Abstract

The invention relates to a magnetic drive pump (10) comprising: a housing (12) at least partially filled with a conveyed fluid; an impeller chamber (14) enclosed by the housing (12); a pump shaft (22) ; the impeller (24), which is arranged in the impeller chamber (14) and arranged on the pump shaft (22); the bearing (26), which supports the pump shaft (22) in the housing (12); enclosing the coupling chamber ( 20) the tank (18); the rotor (50), which is arranged in the coupling chamber (20) and arranged on the pump shaft (22); the ring (16) held in the housing, which supports the bearing (26 ) and the impeller chamber (14) is separated from the coupling chamber (20); the pipe (28) formed in the ring (16) is used to transfer part of the flow of the delivered fluid from the impeller chamber (14) to the bearing (26) for the purpose of lubricating the bearing (26), wherein at least a part of the conveyed fluid discharged from the bearing (26) reaches the coupling chamber (20). The object of the present invention is to improve such magnetic drive pumps so that when the pump (10) is in a dry running state, i.e. when there is no longer delivered fluid on the suction side of the pump (10) and the pump continues to run, the pump is still ensured. The safe and reliable lubrication of the bearing (26) of the shaft (22) within a certain period of time. The invention achieves this object in that the coupling chamber ( 20 ) is closed in a fluid-tight manner relative to the impeller chamber ( 14 ).

Description

technical field [0001] The present invention relates to a magnetic drive pump. Background technique [0002] Magnetic drive pumps have long been known from the prior art. [0003] They are a combination of conventional pump hydraulics and a drive system, usually with a permanent magnetic coupling. Magnetic drive pumps utilize attractive and repulsive forces between permanent magnets in two coupled halves, enabling contact-free and slip-free torque transfer. The drive power is transmitted from the electric motor in a contact-free and slip-free manner via a drive shaft connected to the outer rotor, the rotor carrying the pump-side magnets (inner rotor). The rotor drives the impeller via the pump shaft. In this case, the pump shaft is supported in the pump housing by bearings, which are lubricated by the fluid being delivered. The tank is arranged between the two rotors. The tank separates the conveyed fluid from the environment. The delivered fluid in the magnetic drive ...

AI Technical Summary

Problems solved by technology

[0005] Disadvantageously, when known magnetic drive pumps are operated in dry running state, sufficient lubrication of the bearings or cooling of the tank is not possible, since the part of the flow required for lubrication or cooling continuously continues to leave the bearing and the coupling chamber, However, the new partial flow required for lubrication / cooling cannot be supplied because the delivered fluid is no longer present

In a short time, overheating occurs and the bearing is destroyed

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