Floating roof tank oil-gas-free space sealing structure

The utility model discloses an oil-gas-free space sealing structure of a floating roof tank. One end of a bearing plate (3) with an annular structure is fixed at the top of the floating disc (2); theother end is fixed on the scraper (4); the scraping plate (4) with the annular structure is tightly attached to the tank wall (1) in a sliding manner; the primary sealing belt (5) and the secondary sealing belt (6) are enclosed in an annular space between the tank wall (1) and the floating disc (2) to form a primary sealing space and a secondary sealing space; a limiting hook (7) and a pressing plate (8) are arranged in the secondary sealing space, the top of the limiting hook (7) is fixed to the top of the floating disc (2), the limiting hook (7) descends along the outer wall of the floatingdisc (2) and then horizontally extends outwards, one end of the pressing plate (8) is fixed to the top of the floating disc (2), and the other end presses the secondary sealing belt (6). The oil-gas-free space sealing structur