Patent ID: 11913698
Assignee: CSIC PRIDE (NANJING) CRYOGENIC TECHNOLOGY CO., LTD.
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A self-pressure-relief air distribution mechanism, comprising an air distribution valve (6) and a rotary valve (7), wherein a rear face of the air distribution valve (6) is divided into a high-pressure face (66) and a low-pressure face (65), the high-pressure face (66) is located in the middle of the low-pressure face (65), and the high-pressure face (66) and the low-pressure face (65) are hermetically separated by a third sealing ring (b3) that seals the air distribution valve (6) and a cover (2); the air distribution valve (6) is provided with a pressure-relief hole (61) that axially penetrates an air distribution face (64) and the low-pressure face (65) of the air distribution valve (6), a low-pressure passage (22) of the cover (2) can communicate with the rear face of the air distribution valve (6) via the pressure-relief hole (61), and a low-pressure airflow in the cover (2) can be guided to the rear face of the air distribution valve (6) through the pressure-relief hole (61), to reduce a positive pressure between the air distribution face (64) and a switching plane (73) of the rotary valve (7); a pressure-relief-hole inner-edge inner-diameter D3 of an inner edge circle formed by points corresponding to an inner edge of the pressure-relief hole (61) surrounding an axis of the air distribution valve (6) is greater than an outer diameter D5 of the switching plane (73); the outer diameter D5 of the switching plane (73) is greater than an outer diameter D4 of a switching region formed by a low-pressure hole (71) and a high-pressure groove (72) on the rotary valve (7); and an outer diameter D2 of a sealing face corresponding to the high-pressure face (66) is smaller than the outer diameter D4 of the switching region formed by the low-pressure hole (71) and the high-pressure groove (72) on the rotary valve (7).