Vortex pump (scroll pump)
- The working characteristics and application of the vortex pump
The flow of the vortex pump is reduced and the head increases, so this is a high head, small flow pump. Because the zero-hour axis power is large, therefore, the exit valve must be fully open at start-up, therefore, it is not suitable to change the way the drain pipe valve to regulate the flow rate, high efficiency does not exceed 45%, generally 15% to 40%.
The radial and axial clearance requirements of the turbine and pump body are very strict, generally radial clearance 0.17 to 0.3mm, axial clearance 0.1 to 0.2mm, so it is not suitable for the transport of solid particles and high viscosity liquids. It is mainly used to replace the low-ratio revolution elevation of centrifugal pumps. Compared with centrifugal pumps with the same performance, although the volume is small, the mass is light, the structure is simple and the cost is low, the liquid energy loss in the pump is large and the efficiency is low.
- Principles and characteristics of the vortex pump.
The vortex pump shell is circular and the centrifugal pump is a spiral worm shell structure. The impeller of a scroll pump is a disc made of steel or copper that mills into many radial blades on both sides of the disc. The end face of the blade is closely connected with the pump body, and its axial gap is about 0.10 to 0.15mm. The flow channel consists of a ring cavity between the impeller, the vacuum pump body and the pump cover. A section of the inlet and outlet separated in the runway is called a tongue break, and its radial gap is small between the impeller. Prevent high-pressure liquid from flowing out of the outlet from penetrating the inhaler. The blades of the open vortex pump are longer, the blade diameter is smaller than the diameter of the channel, and the liquid enters the impeller through the suction port and then into the runway. Closed vortex pump impeller blades are relatively short, the diameter of the impeller is equal to the diameter of the channel, liquid from the suction into the flowway, and then from the outside of the impeller into the impeller.
Fluids in the runway and impeller are absorbent, and when the impeller rotates, because the centrifugal force of the moving liquid in the impeller is greater than the centrifugal force of the moving liquid in the runway, a central line of vertical rotation along the runway is created between the two, called a vertical vortex. Under vertical vortex action, impellers can enter and exit multiple times during the entire process from inhalation to discharge, similar to the flow of liquid within a multi-stage centrifugal pump. Every time fluid flows in the impeller, it gets energy. When fluid flows alternately from the blade to the runway, it is mixed with the liquid flowing in the runway. In the mixing process, because the two fluid flow speeds are different, momentum exchange is produced, thus increasing the energy of the liquid in the flowway, so the vortex pump mainly relies on this vertical vortex to transmit energy.
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