Radial impeller

Abstract

The invention provided a radial impeller, simplifying a metal mold for mass-production of a radial impeller to heighten the production efficiency while attaining high efficiency of the radial impeller of a centrifugal fluid machine and realizing a low-noise pump. In the centrifugal fluid machine such as a centrifugal pump, the radial impeller is so constructed that a blade pressure surface 6 of the radial impeller 1 is shaped like a two-dimensional curved surface, a blade negative pressure surface 7 is shaped like a three-dimensional curved surface, the blade thickness 19 of the impeller hub 3 side is made larger than the blade thickness 19 of an impeller rear face shroud 5 side, and the blade thickness 19 is gradually decreased as it goes from the impeller hub 3 side toward the impeller rear face shroud 5 side, thereby gradually decreasing the blade inlet angle 16 of the radial impeller 1 as it goes from the impeller hub 3 side toward the impeller rear face shroud 5 side.

Description

technical field [0001] The present invention relates to an invention related to the shape and structure of a centrifugal impeller in a centrifugal fluid machine including a centrifugal pump, and particularly an invention about the shape and structure of a centrifugal impeller in a centrifugal pump. Background technique [0002] for in figure 1 For the centrifugal impeller 1 of the centrifugal pump shown in Figure 4 and Figure 5 As shown in , in order to ensure that the centrifugal impeller 1 can achieve high efficiency so that the fluid can flow smoothly through the flow channel 10 between the blades, the inlet angle 16 of the blade is consistent with the inlet angle 17 of the fluid to ensure the conflict-free inflow condition of the blade 4 It is important to reduce the collision loss in the flow channel 10 between the blades. [0003] In addition, considering the performance of general centrifugal pumps, it is necessary to gradually increase the radius of the blade inle...

AI Technical Summary

Problems solved by technology

However, for this type of blade 4 in the shape of a two-dimensional curved surface, since the blade inlet angle 16 and the fluid inlet angle 17 of the centrifugal impeller 1 become inconsistent, the fluid inflow collision loss of the blade 4 and the inter-blade flow A large loss occurs in the channel 10, and it is difficult to achieve high efficiency for the centrifugal impeller 1 with blades 4 in the shape of a two-dimensional curved surface

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