Delivery pump structure for p-hydroxybenzoic acid production

The utility model discloses a delivery pump structure for p-hydroxybenzoic acid production, which is characterized in that the delivery pump structure comprises a pump body and a motor in the pump body, the motor comprises a motor shaft, the pump body comprises a shell and an impeller, the front end of the shell is provided with an impeller cavity corresponding to the impeller, the shell is internally provided with an outer flow channel communicated with the impeller cavity and the rear end of the shell, and the motor shaft is internally provided with an inner flow channel; the shell is provided with a rear end cover at the rear end of the motor, a confluence cavity is arranged between the rear end cover and the motor, the inner flow channel is communicated into the confluence cavity, a flow guide hole communicated with the outer flow channel is formed in the side face of the confluence cavity, a sliding plug matched with the flow guide hole is arranged in the outer flow channel, and the sliding plug is conne