The utility model discloses a vacuum pressure gauge sensitive pressure mechanism, comprising a balance spring assembly, wherein the balance spring assembly comprises a pressure balance spring and a vacuum balance spring, and the vacuum balance spring is arranged below the pressure balance spring; and a sensitive pressure assembly, wherein the sensitive pressure assembly comprises a sensitive pressure bellows and a contact member, the contact member is arranged at the top of the sensitive pressure bellows, the contact member passes through the vacuum balance spring, and the top of the contact member is respectively in contact with the pressure balance spring and the vacuum balance spring on the upper and lower sides. The present application adopts a sensitive pressure bellows as a sensitive pressure element, and the balance spring assembly is composed of upper and lower spring 片s. When measuring vacuum, only the lower vacuum balance spring works, and when measuring pressure, only the upper pressure balance spring works. Through the independent work of the two spring 片s, the sensitive pressure assembly can have the same displacement range when testing vacuum and side pressure, so that the sensitive pressure assembly After the pointer is connected, the pointer has a larger reading area when measuring vacuum and measuring pressure, so that better accuracy can be obtained when reading.
