Centrifugal blower for relieving stress concentration for vane plate coupling part

Abstract

The invention aims to provide a centrifugal blower with a backward blade wheel, which alleviates the stress concentration born by a joint part of a blade board. The centrifugal blower has a preshaped cut part with a preset shape on the edge of the blade board and close to the joint part with a shield, so as to alleviate the stress concentration of the joint part of the blade board. The shape of the gap is formed by walls parallel to each other and a curved bottom which connects the two walls.

Description

Centrifugal blower that reduces stress concentration on blade joints technical field The present invention relates to a centrifugal blower with backward blade wheels used as ventilation equipment for various air supply and exhaust, painting equipment, dust collecting devices, factories, etc. Background technique The backward blade wheel of the centrifugal blower has the outlet of the blade plate facing the radial direction, and the outlet angle of the blade plate is facing the rear (30°~60°), and the blade plate that is curved from the inlet to the outlet is in the The main board and side boards of equal thickness are fixed by welding or riveting. In addition, the main plate is fixed by welding or riveting to the shaft portion formed to shape the flow path of the impeller inlet. Furthermore, at the inlet of the blade wheel, an annular portion called a shroud is connected to the outer edge portion of the blade plate by welding or the like, so that air introduction to the b...

AI Technical Summary

Problems solved by technology

However, in this case, there will be an increase in the weight or material cost of the blade wheel

Moreover, the increase in the weight of the blade wheel will cause the increase of the inertial weight of the blade wheel, which increases the starting time of the blower when it is running, and the problem that it cannot be started by using the general-purpose motor torque, or in the general-purpose motor overload protection device. , resulting in the problem of poor starting caused by wrong action

In addition, since a special motor or a motor overload protection device is used to enable the blower to start, there is a problem that it becomes uneconomical in saving resources and energy.

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