【Haichuan Equipment Guessing Game】What type of pump component is this?

This is the bowl-shaped shell of the VS6 pump, known as the spatial guide vane body

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What are the characteristics or uses of this structure?

The VS6 pump is a vertical double-shell (with the inner shell serving as a guide shell) suspended centrifugal pump, suitable for applications involving low cavitation levels and clean media that are cold or hot-neutral or corrosive.

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The spatial guide vane body, also known as a guide shell, is characterized by a long axial length and a short radial length. It is used in various well pumps (deep well pumps, submersible pumps) as well as vane-type mixed-flow pumps. The flow within it is complex, with the blades being highly twisted, which presents certain design challenges. The spatial guide vanes serve the function of an entire pressure chamber, collecting the fluid at the impeller outlet and sending it to the inlet or outlet ducts of the subsequent impellers, converting kinetic energy into pressure energy, and eliminating velocity circulation. When designing traditional spatial vanes, it is necessary to determine the inlet and outlet angles of the vanes, the inner and outer flow lines, the axial length, and the intermediate flow line. The inlet angle of the guide vanes is set to be greater than the flow angle, while the outlet angle is generally 90°. The inner streamline is the intersection line between the hub and the guide vane blades, and the outer streamline is the intersection line between the casing and the guide vane blades. The axial length L of the guide vanes is equal to (0.5~0.7) D2 (where D2 is the outer diameter of the impeller), and the middle streamline ensures that the flow rates through the two small channels it divides into are equal. In the space vanes, as the liquid flows from the impeller outlet into these vanes through the annular space, its direction of flow changes. There is significant backflow and turbulence at the inlets of the space vane blades, and considerable secondary flow occurs on the suction side of the space vanes, resulting in high hydraulic losses that affect the pump’s efficiency. Data shows that the hydraulic losses in the space vanes account for 40% to 50% of the total hydraulic losses within the pump. At the same time, phenomena such as these secondary flows and vortices further exacerbate the vibration and noise induced by the fluid in the pump, reducing its operational stability. Therefore, the spatial guide vanes have a significant impact on the overall performance of centrifugal pumps.