Structure of a vertical-type, acid and base resistance pump

An improved structure of a vertical-type, acid and base resistance pump is disclosed. The present pump structure comprises a motor, a seal cap, a ceramic ring, two seals, a shaft cap, a propeller wheel and a pump body, the front of the motor provided with a shaft center having mounted with the shaft cap to prevent fluid from entering and to engage with the propeller wheel, the external side of the shaft center provided with the pump body having an outlet tube, the seal cap located between the top section of the body and the motor, and the bottom section of the body mounted with the ceramic ring, characterized in that the positive face and the reverse face of the shaft cap are provided with the high abrasive resistance seals, and the two seals contact at the top and bottom of the ceramic ring, such that the heat energy is dissipated from the seal cap to outside, and gas is prevented from entering and the reverse-flow of fluid is prevented.