Main shaft seal device for water turbine

The utility model relates to a main shaft seal device for a water turbine, which mainly comprises a seal chamber, a press cover, a guide bar, a spring, a seal ring, a spacer pin, bolts and nuts. The utility model has the connection relationship that the press cover is fixed to the seal chamber and the pressing plate; a watercourse is arranged in the seal chamber, and one end of the watercourse is sealed by a screw plug; the press cover is connected with the guide bar by screw threads; the spring which presses the seal chamber is fixed to the lower end of the guide bar; the lower end face of the seal chamber is provided with the seal ring, and the spacer pin is arranged between the press cover and the seal chamber. The utility model has the advantages that because the pressing plate type seal is utilized to take the place of the piston type seal, the seal ring can not be abraded; because the seal ring is made of high molecular material, the ageing resistance is strong, and the abrasion-proof performance is realized, and the safety and the reliability of the main shaft seal are ensured. In addition, the utility model overcomes the defects that the piston type seal can not be easily repaired after the piston type seal is burnt, and the ageing of the rubber is easy to happen. The utility model also has the advantages of simple structure, reasonable design, and good social benefit and economic benefit.