Multi-diaphragm speaker system

1. A multi-diaphragm speaker system, characterized by comprising a speaker device and a front-rear cavity sealing device; wherein,

the speaker device comprises at least four diaphragms;

a plurality of cavities of the speaker device are respectively formed between every two adjacent diaphragms of the speaker device, wherein, cavities that are spaced apart from each other jointly form a first acoustic cavity of the speaker device, and a cavity or cavities adjacent to the first acoustic cavity form a second acoustic cavity of the speaker device;

the first acoustic cavity and the second acoustic cavity are separated through the front-rear cavity sealing device; and

the front-rear cavity sealing device comprises a front cavity sealing device and a rear cavity sealing device, and the front cavity sealing device interconnects the cavities that are spaced apart from each other and jointly form the first acoustic cavity of the speaker device.

2. The multi-diaphragm speaker system according to claim 1 , characterized in that, the speaker device further comprises inner connecting rods and outer connecting rods;

diaphragms located at odd-numbered positions are interconnected through the inner connecting rods to form a first group of diaphragms, the inner connecting rods connected with the diaphragms located at odd-numbered positions are connected through the outer connecting rods, and the diaphragms in the first group of diaphragms vibrate in a same direction;

diaphragms located at even-numbered positions are interconnected through the inner connecting rods to form a second group of diaphragms, the inner connecting rods connected with the diaphragms located at even-numbered positions are connected through the outer connecting rods, and the diaphragms in the second group of diaphragms vibrate in a same direction; and

a vibrating direction of the first group of diaphragms is opposite to that of the second group of diaphragms.

3. The multi-diaphragm speaker system according to claim 2 , characterized in that,

the inner connecting rods are connected to rigid domes of the diaphragms through connection points provided on the diaphragms.

4. The multi-diaphragm speaker system according to claim 1 , characterized in that, the first acoustic cavity forms a front acoustic cavity of the multi-diaphragm speaker system, and the second acoustic cavity forms a rear acoustic cavity of the multi-diaphragm speaker system.

5. The multi-diaphragm speaker system according to claim 1 , characterized in that, the rear cavity sealing device comprises a first rear cavity sealing housings and a second rear cavity sealing housing.

6. The multi-diaphragm speaker system according to claim 5 , characterized in that,

the front cavity sealing device is disposed at an opening of the first acoustic cavity, which opening is provided at one side of the first acoustic cavity, so as to separate the first acoustic cavity and the second acoustic cavity.

7. The multi-diaphragm speaker system according to claim 6 , characterized in that, each of the first rear cavity sealing housings is disposed at one end of another opening of the first acoustic cavity, which opening is provided at another side of the first acoustic cavity, and the second rear cavity sealing housing is connected with an opening of the second acoustic cavity, which opening is provided at one side of the second acoustic cavity.

8. The multi-diaphragm speaker system according to claim 1 , characterized in that first, second, third and fourth diaphragms are arranged in consecutive order; and

the first acoustic cavity connects a space between the first and second diaphragms and a space between the third and fourth diaphragms.

9. The multi-diaphragm speaker system according to claim 1 , characterized in that first, second, third and fourth diaphragms are arranged in consecutive order; and

the second acoustic cavity connects a space behind the first diaphragm to a space between the fourth diaphragm.