Definition of a rotary shell pump

Enters the periphery of the drum 6 and high speed liquid enters from the entrance of the pitot tube 5 at the outermost periphery of the drum. Due to Pitot tube cross-sectional area gradually expanded, the liquid flow rate gradually reduced, thus the kinetic energy of liquid into pressure energy. The magnetic pump finally discharges the high-pressure liquid from the liquid outlet pipe 3. As the impeller 4 and the rotary drum shell pump, also known as Pitot tube pump, the rotor components, pitot tube, bearing seat components, shell and out of the liquid pipe and other components as shown in Figure 2-12. The housing part 8 of the rotary shell pump is the same as a conventional centrifugal pump. The overflow part impeller 4 is integrated with the drum 6 (corresponding to the pump housing of the centrifugal pump) 6 and bolted to the main shaft 7 to form a rotor part. The outer periphery of the drum 6 is provided with a protective cover for the outer shell 9, and is bolted to the bearing seat 8. The right end of the outer housing 9 is fixed mechanical seal 2, into the liquid pipe l and the liquid outlet pipe 3. High temperature magnetic pump core pitot tube 5 is fixed on the liquid outlet tube 3, extending from the axis close to the inner wall of the drum 6 drum. (1) Working principle of the rotary shell pump The liquid enters the impeller 4 from the inlet pipe 1, and the kinetic energy is obtained from the high-speed rotation of the impeller. The liquid is continuously rotated synchronously along the axial direction 6 from the periphery of the impeller. Therefore, during the process of obtaining kinetic energy, No disc friction loss. This is where the efficiency of a high-speed pump and a multistage centrifugal pump with a spiral pump is much higher than that of the same ultra-low rpm. Pitot tube flow channel design and dimensional accuracy and finish is to determine the kinetic energy into pressure and energy efficiency of the key factors. Pitot tubes have an airfoil profile that minimizes flow resistance. (2) Range of performance parameters of the rotary shell pump The same as the high-speed pump, the rotary pump also belongs to the partial flow pump, the performance curve is similar. Foreign parameters of the rotary shell pump parameters: flow l ~ 160ms / h, lift ≤ l600m; domestic sea lions rotary shell pump parameters range: flow l ~ 120m3 / h, head 120 ~ 920m, Sichuan Machinery Research Institute of the shell pump parameters Range of flow 1 ~ 90m3 / h, lift 150 ~ 720m. Sealed pump usually modular design. The same pump, changing the pitot tube inlet diameter, pitot tube number and pump speed, can greatly change the performance of the metering pump parameters to meet the different flow and lift requirements, and to ensure the pump in the high-efficiency zone. (3) Features of the rotary shell pump ① For low flow rate, when the high efficiency lOOm3 / h or lift> 1600m, the high speed pump is more efficient than the rotary pump. ② simple structure, high reliability spiral shell pump for the single stage, simple structure, less wearing parts. The mechanical seal of the rotary shell pump is installed on the suction port of the pump, which can withstand the low pressure at the inlet and the pump speed is lower than that of the high-speed pump with the same parameters. Therefore, the pV value of the mechanical seal is lower than the high-speed pump and the service life is longer. ③ sensitive to particles in the media Rotary pump is not suitable for conveying solid content greater than l% of the media, or Pitot tube entrance will wear quickly, causing a sharp drop in pump performance.

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