Impeller for ventilation therapeutic equipment, draught fan for ventilation therapeutic equipment, and ventilation therapeutic equipment

Abstract

The invention relates to the field of ventilation therapeutic equipment, and discloses an impeller for ventilation therapeutic equipment, a draught fan for ventilation therapeutic equipment, and the ventilation therapeutic equipment. The impeller includes an impeller disc and a plurality of blades. The plurality of blades are arranged on one side surface of the impeller disc and are arranged at intervals along the circumferential direction of the impeller disc. Main flow paths for a medium to flow are formed between every two adjacent blades. The impeller disc is provided with a plurality of through holes corresponding to the plurality of the main flow paths. The blades are arranged to extend from the center of the impeller disc toward the edge of the impeller disc and terminate at the inner side of the edge. The through holes are located between the tail ends of the blades and the edge in the radial direction of the impeller disc. The impeller of the present invention, on the one hand, can reduce the intensity of the impeller vortex shedding noise by making a gap between the tail ends of the blades and the edge of the impeller disc, on the other hand, can greatly reduce the low-frequency noise by providing the through holes in the impeller disc. When the impeller of the present invention is applied to the draught fan, the noise reduction effect of the draught fan can be effectively improved.

Description

technical field [0001] The present invention relates to the field of ventilation therapy equipment, in particular to an impeller for ventilation therapy equipment, a fan including the impeller, and ventilation therapy equipment including the fan. Background technique [0002] The core component of ventilation therapy equipment is a small fan, and the fan is also the source of noise generated by ventilation therapy equipment. The blade structure of the fan plays a vital role in the size of the noise. Specifically, during the use of the fan, the fan converts other forms of energy into mechanical energy for the rotation of the impeller, and the rotating impeller can transfer energy to the continuously flowing gas to realize gas transportation and energy transfer. However, due to the large aerodynamic noise caused by the high-speed rotation of the impeller, the application of the fan is largely restricted. Therefore, the reduction and control of fan noise is particularly import...

AI Technical Summary

Problems solved by technology

However, the noise reduction effect of this method is not obvious, and it only has a significant effect on a specific impeller, and the versatility is poor

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