An impeller for a centrifugal fan and its control method

Abstract

The invention discloses an impeller for a centrifugal blower. The impeller comprises a front ring, a rear ring and a blade assembly arranged between the front ring and the rear ring. The impeller is characterized in that the blade assembly comprises a blade and a first elastic layer for coating the blade; a through hole is formed in the first elastic layer; and a check valve is arranged in the through hole. The invention also discloses a control method of the impeller. Compared with the prior art, the impeller has the advantages that an elastic coating layer is arranged outside the blade, thecoating layer is filled with gas to change the integral rigidity of the blade, abnormal sound due to non-uniform stress during the impeller operation process can be effectively avoided, the noise of ablower system can be effectively reduced, and the elastic coating layer is arranged on a wheel disc fixed to the rear ring, and is filled with gas, so that the shaking of the rear ring can be eliminated.

Description

technical field [0001] The invention relates to a power device, especially an impeller for a centrifugal fan and a control method for the impeller. Background technique [0002] The impeller is a crucial energy transmission component in the fan system. The impeller is affected by the electromagnetic force of the motor, the structural stiffness of the impeller itself, and the parameters such as the structural mode and structural stiffness of the impeller during the transportation and installation process change. The unbalanced force will lead to abnormal sound, which not only causes the abnormal sound problem that is difficult to solve for engineering designers, but also seriously affects the cooking experience of customers. [0003] During the normal operation of the impeller, the structural parameters such as the blade, the disc, the front ring and the rear ring of the same impeller are the same, but in actual conditions, due to the electromagnetic force of the motor, the c...

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Problems solved by technology

[0002] The impeller is a crucial energy transmission component in the fan system. The impeller is affected by the electromagnetic force of the motor, the structural stiffness of the impeller itself, and the parameters such as the structural mode and structural stiffness of the impeller during the transportation and installation process change. The unbalanced force will lead to abnormal sound, which not only causes difficult to solve abnormal sound problem for engineering designers, but also seriously affects the cooking experience of customers

[0003] During the normal operation of the impeller, the structural parameters such as the blade, the disc, the front ring and the rear ring of the same impeller are the same, but in actual conditions, due to the electromagnetic force of the motor, the coaxial force and the structure of the eccentric volute and the The difference in the shape of the blade itself (such as the influence of different structural parameters such as variable-angle logarithmic helix or circular arc used for the inlet-end curve and the outlet-end curve), as well as the structural rigidity changes caused during installation and transportation , making the impeller produce abnormal noise during operation

For the impeller of the range hood fan system, the forward-curved blade impeller is generally used. The blades of the same impeller are formed through an array, and there is a problem of abnormal sound under working conditions. It is impossible to distinguish which blade is structural rigidity or structural mold. state, which leads to difficulties in targeted noise reduction

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