Airflow accelerating device and electronic apparatus

An airflow accelerating device, comprising:

• a housing, having a chamber formed therein;
• at least one vibrating plate, disposed within the chamber;
• at least one division plate, fixed in the housing, for dividing the chamber into at least two sub-chambers, each of the at least two sub-chambers having at least one air outlet configured to transmit airflow generated by vibration of the at least one vibrating plate to outside of the chamber, wherein the at least one division plate comprises M−1 division plates, for dividing the chamber into M sub-chambers, wherein M is a positive integer greater than 1;
• the at least one vibrating plate comprises M vibrating plates, disposed within the M sub-chambers respectively, and fixed on the housing or the division plate;
• wherein in the case that the airflow accelerating device starts, at least two adjacent vibrating plates among the M vibrating plates have opposite vibrating directions,
• wherein the M vibrating plates comprises at least one group of vibrating plates, the at least one group of vibrating plates comprises a first, a second and a third vibrating plates, and
• the first vibrating plate and the third vibrating plate are located adjacent to each other in a plane and have the same vibrating direction, and the second vibrating plate is located parallel to the plane;
• wherein at least one part of a projection of the second vibrating plate onto the plane overlaps with the first vibrating plate and at least another part of the projection overlaps with the third vibrating plate, and wherein the second vibrating plate is heavier than any one of the first and third vibrating plates.