Closed vortex pump working principle

Vortex pump (also known as vortex pump) belongs to the vane pump. The vortex pump transports the liquid by rotating the impeller blades to exchange the momentum of the liquid in the flow channel with the three-dimensional flow. The liquid in the pump can be divided into two parts: the liquid between the grooves of the impeller and the liquid in the flow channel between the pump and the impeller. When the impeller rotates, the circumferential speed of the liquid in the flow channel is smaller than the circumferential speed of the impeller, and the liquid in the impeller is thrown into the flow channel from the impeller groove under the centrifugal force. Then decelerates under the action of shear force between the liquids and transfers the energy to the liquid in the flow channel. Impeller groove thrown out of the original liquid at the same time, the internal pressure decreases, so that the flow of liquid into the groove. This allows the liquid to create the same "longitudinal vortex" as the impeller turns (Figure 2-31). This longitudinal vortex liquid in the runner repeatedly returns to the impeller, once again by the centrifugal force, and after each centrifugal force, lift head once, so the vortex pump with other vane pumps can not reach the high lift. Note that the same liquid particle does not pass through each impeller groove in the longitudinal vortex. Nor do all liquid particles pass through the impeller. As the flow rate increases, the number of longitudinal vortices generated by the liquid decreases, and the head decreases. When the flow is zero, the vertical vortex liquid generated the most times, the highest lift. Vortex pump impeller with open and closed two kinds, closed impeller blade groove with an intermediate partition, as shown in Figure 2-31 (a) below: Open impeller without intermediate partition. Closed Vortex Pump (1) Closed Vortex Pump Closed vortex pump structure shown in Figure 2-32, mainly by the impeller, pump body, separated tongue. Figure ends of the runner (or end) with the import or export H, known as the open runner. Impeller open balance hole for balancing axial force. Fluid flow from the entrance into the vertical vortex driven by the impeller to obtain energy, discharged by the outlet, near the outlet side of the liquid between the blades with the impeller back to the pump inlet. Closed vortex pump Features ① closed self-priming pump does not self-priming capacity, not suitable for gas-liquid mixed transport. The inlet gas mixes with the liquid into the vane groove. Due to the different density of the liquid and the gas, the liquid with high density is thrown to the outside of the vane groove and the flow channel by the centrifugal force under the centrifugal force. The gas stays at the root of the vane groove. Outflow out, the root of the blade groove gas with the impeller back to the entrance, unable to achieve exhaust. Closed vortex pump to have self-absorption capacity, the need to add an auxiliary device on the outlet side, so that the flow of liquid to the roots of the groove leaves the gas discharge, and gas-liquid separation and liquid backflow structure. Closed vortex pump cavitation performance is poor. The inlet flow from the outer edge of the impeller to the root of the blade groove, uneven distribution of velocity, the impact of larger, so closed vortex cavitation performance than open vortex pump. ③ Closed vortex pumps are generally single or two. ④ closed vortex pump efficiency is generally 35% to 45%, higher than the open vortex pump.

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