Diagonal fan and household appliance

Abstract

The invention provides a diagonal fan and a household appliance. The diagonal fan comprises a wheel cover assembly and a diagonal wind wheel. The wheel cover assembly comprises multiple sleeved wheelcovers, the wheel covers are provided with air inlets, the wheel cover located on the outer side stretches downstream relative to the wheel cover located on the inner side in any two adjacent wheel covers, a backflow passageway is formed between any two adjacent wheel covers, and the backflow passageways communicate with the air inlets. The diagonal wind wheel is partially arranged in the wheel cover on the innermost side in the multiple wheel covers. The diagonal wind wheel comprises a hub and multiple blades arranged on the hub, and the tops of the blades can correspond to inlets of the backflow passageways. By means of the technical scheme, the operating stability of the diagonal fan is improved, the pneumatic performance of the diagonal fan is improved, and meanwhile the probability that the blade frequency doubling noise is increased is reduced.

Description

technical field [0001] The invention relates to the field of home appliances, in particular to a diagonal flow fan and a home appliance. Background technique [0002] Diagonal flow fan, also known as mixed flow fan, is a type of fan between centrifugal fan and axial flow fan. This type of fan has the characteristics of higher exhaust pressure than axial flow fan and higher efficiency than centrifugal fan. It has become more and more popular in recent years. It has been applied more and more. In related technologies, the structure of the diagonal flow fan is as follows figure 1 and figure 2 As shown, the following defects still exist during operation: [0003] Under the working conditions with a relatively wide range of flow rates, flow separation or even backflow is prone to occur at the top of the blades of the oblique flow fan near the outlet, resulting in a wider stall zone for the oblique flow fan, which is shown as axial flow on the performance curve. The flow fan i...

AI Technical Summary

Problems solved by technology

[0004] Under the condition of small flow rate, due to the large differential pressure between the pressure surface and the suction surface of the impeller, a strong blade tip leakage vortex appears under the combined action of the differential pressure on both sides and the underflow, forming a large number of vortices on the blade tip. However, when the flow rate of the diagonal flow fan is reduced to a certain extent, a large area of ​​backflow area can be observed in the blade tip area. At this time, the internal flow field of the impeller fluctuates, resulting in unstable operation of the diagonal flow fan in the application. In the case of a small pressure fluctuation, the flow rate fluctuates greatly, which has a great impact on the aerodynamic performance and noise performance of the diagonal flow fan, and the low-energy fluid then enters the diffuser and interferes with the diffuser blades. also resulted in increased leaf octave noise while stalling

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