Internal respiration type spring brake chamber

The invention discloses an internal breathing type spring brake chamber which comprises a brake chamber body, an air inlet filter box is arranged on the side face of an air inlet cavity, moisture absorption cotton, a first filter screen and a second filter screen are movably clamped in the air inlet filter box in sequence, and a rotating shaft is arranged between the first filter screen and the second filter screen. Guide vanes are fixedly connected to the side face of the rotating shaft in the circumferential direction, a gear is connected to the bottom of the rotating shaft, an eccentric wheel is movably connected to the inner wall of the air inlet filter box, and an eccentric connecting rod is hinged to the eccentric wheel. According to the internal respiration type spring brake chamber, water vapor in air is absorbed through the moisture absorption cotton, the structure is simple, when the air passes through the flow guide blades, the flow guide blades are driven to rotate, the eccentric connecting rod is