shielded pump
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I have a few questions regarding canned pumps. 1. As far as I know, the motors of canned pumps do not have any cooling mechanism; so how do these pumps dissipate heat?； 2. When stopping a shielded pump, the inlet valve should be closed first before the outlet valve; what is the principle behind this? What would be the consequences if the outlet valve were closed first? I hope the experts can help me answer my questions
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1. A canned pump relies on the return flow of the medium to lubricate and cool the bearings; this is the pipe that leads from the pump outlet to the rear end of the pump； 2. When shutting down a canned pump, the outlet should be closed first followed by the inlet; the pump must not be emptied, as doing so will result in the bearings running dry due to a lack of lubrication, thereby damaging them.
1. The bearings of the shielded pump are graphite bearings, which are lubricated and cooled by the medium it transports itself; in addition, there is a cooling water jacket around the motor of the shielded pump, with circulating water used to cool the motor stator. 2. Shielded pumps also belong to the category of centrifugal pumps, and their shutdown procedure is basically the same as that of ordinary centrifugal pumps: first close the outlet, then the circulation line, and finally the inlet
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1. The shielded pump has one or two cycles: the main cycle and a small cycle for the motor. The main cycle is used to meet the process requirements, while the minor cycle is used for heat dissipation of the motor and lubrication of the bearings. In some operating conditions, cooling water must be applied to the motor surface, which requires an external circulating cooler. 2. The requirements for closing the valve are the same as those for ordinary centrifugal pumps
1. The bearings of the shielded pump are graphite bearings, which are lubricated and cooled by the medium it transports itself; in addition, there is a cooling water jacket around the motor of the shielded pump, with circulating water used to cool the motor stator. 2. Shielded pumps also belong to the category of centrifugal pumps, and their shutdown procedure is basically the same as that of ordinary centrifugal pumps: first close the outlet, then the circulation line, and finally the inlet