Oil gas sealing device and method for bearing of hydroelectric generating set

The invention discloses an oil gas sealing device and method for a bearing of a hydroelectric generating set. A refrigerant cooling system and a blade wind pressure system are arranged in an oil gas collecting sealed cabin, a gas sealing system is located outside the oil gas collecting sealed cabin, and a large shaft drives the blade wind pressure system to rotate at a high speed to form a wind pressure sealing area to block high-temperature oil gas rising from an oil mist escape channel; the high-temperature oil gas makes contact with a refrigerant pipe to form liquid turbine oil, and the liquid turbine oil drops into an annular oil bath of a bottom plate and flows back to a bearing oil groove; and when a small amount of oil gas overpasses the wind pressure sealing area and escapes from a seal belt area, the liquid turbine oil is formed again after the liquid turbine oil is reversely blown to the refrigerant pipe through air injection sealing of a gas sealing system. The device and the method overcome the pr