Into the periphery of drum 6, from the high-performance liquid located at the periphery of the drum zui pitot tube inlet 5 enters. As the cross-sectional area of ​​the pitot tube is gradually enlarged, the liquid flow rate is gradually reduced, thereby converting the kinetic energy of the liquid into pressure energy. magnetic pump
After the zui, the high pressure liquid is discharged from the discharge pipe 3. Because the impeller 4 and the rotary drum pump, also called the pitot tube pump, are composed of the rotor component, the pitot tube, the bearing seat component, the outer casing and the inlet and outlet pipes .
As shown in Figure 2-12. The housing part 8 of the rotary shell pump is the same as a conventional centrifugal pump, and the flow impeller 4 and the rotating drum (corresponding to the pump casing of the centrifugal pump) 6 are integrally connected, and are fixed to the main shaft 7 by bolts to constitute a rotor component. The outer periphery of the drum 6 has an outer casing 9 functioning as a protective cover and is bolted to the bearing housing 8. The mechanical seal 2, the inlet pipe 1, and the outlet pipe 3 are fixed to the right end cover of the outer casing 9 . The high temperature magnetic pump core piece pitot tube 5 is fixed to the liquid discharge pipe 3 and extends from the axis to the inner wall of the cylinder close to the drum 6 .
(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 by the high-speed rotation of the impeller, and the liquid is continuously connected from the periphery of the impeller in the axial direction 6 so that the liquid is in the process of obtaining kinetic energy. No disc friction loss. This is the source of much higher efficiency for a rotary shell pump than a high-speed pump and multi-stage centrifugal pump of the same ultra-low specific speed. Piston internal flow channel design and dimensional accuracy and finish are key factors in determining the efficiency of kinetic energy conversion into pressure energy. The outer shape of the pitot tube is the airfoil section to make the flow resistance zui small.
(2) Spindle pump performance parameter range The rotary shell pump is the same as the high-speed pump, and also belongs to the partial flow pump, and the performance curve is similar.
The parameters of foreign spiral shell pump are: flow rate l ~ 160ms / h, head ≤ l600m; domestic Jiangsu sea lion shell pump parameters range: flow l ~ 120m3 / h, lift 120 ~ 920m, Sichuan Machinery Research Institute's shell pump parameters The range is from 1 to 90 m3/h and the head is from 150 to 720 m.
The rotary shell pump is usually modular in design. The same pump, changing the pitot tube inlet diameter, the number of pitot tubes and the pump speed, can greatly change the performance parameters of the metering pump to meet the requirements of different flow and lift, and to ensure that the pump operates in the high efficiency zone.
(3) Features of the rotary shell pump
1 low flow efficiency high flow
2Simple structure, high reliability The rotary shell pump is single-stage, simple in structure and less wearing parts. The mechanical seal of the rotary shell pump is installed at the suction port of the pump and is subjected to the inlet low pressure, and the pump speed is lower than that of the high-speed pump of the same parameter. Therefore, the pV value of the machine seal is lower than that of the high-speed pump, and the service life is long.
3 sensitive to the particles in the medium The rotary shell pump is not suitable for transporting media with a solid content greater than 1%, otherwise the pitot tube inlet will wear out quickly, causing a sharp drop in pump performance.
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