Patent ID: 6854957
Filing Date: 2005-02-15
Classification: F04D

Abstract:
1. A seal of a vertical pump comprising: a front casing disposed fixedly and forwardly on a main casing which has a motor disposed therein; a cantilever shaft of the motor is located toward the front casing; a volute chamber is disposed inside the front casing to receive a centrifugal impeller; a suction inlet is disposed axially and forwardly on the front casing opposite the motor; a water outlet is disposed upwardly on the front casing and opposite the lateral side of the impeller to engage a discharge pipe; both the suction inlet and the water outlet are in communication with the volute chamber; and a non-contact seal is disposed at the rear of the impeller that prevents acid and alkali liquid from flowing reversely toward a v-type oil seal located above a liquid surface when the pump stops and the pump pressure fails to be discharged in time.