Abstract: An air distribution mechanism and a corresponding cryogenic refrigerator are provided. The air distribution mechanism includes an air distribution valve (6) and a rotary valve (7), the air distribution valve (6) includes an air distribution valve main body (6a) and an air distribution valve seat (6b), an air distribution plane (6a3) that is on the air distribution valve main body (6a) and faces away from the air distribution valve seat (6b) protrudes relative to the air distribution valve seat (6b), the air distribution plane (6a3) is tightly attached to a switching plane (73) on the rotary valve (7), and the switching plane (73) protrudes from the rotary valve (7); the air distribution valve (6) is fixedly mounted in a mounting chamber of a cover (2), and the rotary valve (7) is rotatable around a principal rotation axis O of the rotary valve relative to the air distribution valve (6) to switch connection states of an air distribution side flow path and a switching side flow path.

Abstract: A self-pressure-relief air distribution mechanism includes an air distribution valve (6) where a rear face of the air distribution valve (6) is divided into a high-pressure face (66) and a low-pressure face (65), each hermetically separated by a third sealing ring (b3) that seals the air distribution valve (6) and a cover (2). A low-pressure passage (22) of the cover (2) can communicate with the rear face of the air distribution valve (6) via a pressure-relief hole (61), to guide a low-pressure airflow in the cover (2) to the rear face of the air distribution valve (6). A cryogenic refrigerator includes the self-pressure-relief air distribution mechanism. With the provision of the pressure-relief hole (61) and the third sealing ring (b3), the self-pressure-relief air distribution mechanism has a reduced pressure receiving area, thereby reducing a positive acting force and reducing wear.

Abstract: Disclosed are a self-pressure-relief air distribution mechanism and a corresponding cryogenic refrigerator. The self-pressure-relief air distribution mechanism includes an air distribution valve (6) and a rotary valve (7), where a rear face of the air distribution valve (6) is divided into a high-pressure face (66) and a 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); and 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), and 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), to guide a low-pressure airflow in the cover (2) to the rear face of the air distribution valve (6).

Abstract: An air distribution mechanism and a corresponding cryogenic refrigerator are provided. The air distribution mechanism includes an air distribution valve (6) and a rotary valve (7), the air distribution valve (6) includes an air distribution valve main body (6a) and an air distribution valve seat (6b), an air distribution plane (6a3) that is on the air distribution valve main body (6a) and faces away from the air distribution valve seat (6b) protrudes relative to the air distribution valve seat (6b), the air distribution plane (6a3) is tightly attached to a switching plane (73) on the rotary valve (7), and the switching plane (73) protrudes from the rotary valve (7); the air distribution valve (6) is fixedly mounted in a mounting chamber of a cover (2), and the rotary valve (7) is rotatable around a principal rotation axis O of the rotary valve relative to the air distribution valve (6) to switch connection states of an air distribution side flow path and a switching side flow path.