A blade-type composite wind energy harvester

Abstract

A combination vane-type wind energy collector comprises a piezoelectric energy collection module and a friction energy collection module; the piezoelectric energy collection module comprises a vane (7) and a flexible piezoelectric cantilever beam (3); the vane is connected to and is parallel with a free end of the flexible piezoelectric cantilever beam, and the vane drives the flexible piezoelectric cantilever beam to produce periodic vibration within a frame (1); the friction energy collection module comprises a moving friction layer (6) adhered to the surface of the flexible piezoelectric cantilever beam and a fixed friction layer (5) adhered to the inner surface of the frame; and the moving friction layer and the fixed friction layer can periodically contact with or separate from each other within the frame. The combination vane-type wind energy collector increases density of output energy by adopting friction and piezoelectric energy collection methods. The design of the vane at the tail end of the cantilever beam can better respond to airflow disturbances, and thus increases the vibration amplitude of the piezoelectric cantilever beam and the piezoelectric voltage output. In addition, the double-arc, choked-flow frame design increases the contact area between friction layers and thereby increases friction-generated output voltage.

Description

Technical field [0001] The invention relates to the field of energy harvesting and conversion equipment, in particular to a blade type composite wind energy collector. Background technique [0002] At present, wireless sensor networks are widely used in environmental monitoring, smart home, transportation, medical and health and other fields, but the power supply of wireless sensor nodes has become a key factor restricting their development. Traditional battery power supply methods have problems such as large size, short life, and difficult replacement, especially in remote no-man’s areas. Collecting environmental energy to power wireless sensor nodes is an effective way to replace batteries. [0003] As a pollution-free and renewable clean energy, wind energy has huge development potential, especially for coastal islands, remote mountainous areas with inconvenient transportation, vast and sparsely populated grasslands and pastures, and rural areas far away from the power grid and...

AI Technical Summary

Problems solved by technology

At present, wind energy harvesters capable of achieving high output are often bulky and complex in structure

Although the existing wind energy harvester with cantilever beam structure is simple in structure and small in size, its high operating frequency and small amplitude lead to low voltage output and it is difficult to obtain ideal power output

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