Shaft-extending cross-flow propeller type water turbine

Abstract

The invention relates to a shaft-extending cross-flow propeller type water turbine. The shaft-extending cross-flow propeller type water turbine comprises a water inlet part, a water guide mechanism, aleading bearing mechanism, a front spindle, a front spindle seal, a runner mechanism, a runner chamber, a tail water conical pipe, an S-shaped tail water elbow pipe, a rear spindle, a rear spindle sealing mechanism and a thrust combination bearing, wherein the inner diameter of the runner chamber is of a spherical shape, the runner blade of the runner mechanism is a rotatable runner blade, the outer edge of the runner blade of the runner mechanism is spherical, the fixed propeller runner of the water turbine is designed into the rotating propeller runner structure for the first time in China,the shaft-extending cross-flow water turbine blade can be kept in a co-linkage manner along with the change of the water head and the load, the operating range of the water turbine is expanded, the efficiency of the water turbine is improved, and the stability of the unit is improved.

Description

technical field [0001] The invention relates to the technical field of design and manufacture of a shaft-extension tubular water turbine, in particular to a shaft-extension tubular water turbine. Background technique [0002] The tubular turbine is an ideal model for developing low-head hydraulic resources. Due to favorable conditions such as less civil works, short construction period, high efficiency, slight cavitation, good stability and reliability, tubular flow units have developed rapidly in recent years and tend to replace axial flow units. Common tubular turbines can be divided into two types: semi-through and full-through, of which semi-through can be divided into three types: shaft-extension tubular, shaft tubular and bulb tubular, and large and medium-sized hydropower stations are mostly The bulb tubular type is adopted, and the shaft extension tubular type is mostly used in small hydropower stations. [0003] The axial-extension tubular turbine adopts a horizon...

AI Technical Summary

Problems solved by technology

[0008] The axial extension tubular water turbine with fixed paddle type runner currently has the following disadvantages: 1. The diameter of the runner is small, and the blades of the runner are mostly fixed paddle structures, and the angle of the blades of the runner is fixed. When the water head and load change, the efficiency of the turbine drops rapidly, which reduces the technical advantages of the shaft extension tubular turbine

[0009] 2. The main shaft seal is a pressure-contact sealing structure, which is acceptable for clean water power stations, but not suitable for multi-silt power stations, and the main shaft will wear out quickly

[0010] 3. The structure of the leading bearing is complex, the manufacturing cost is high, and the installation and maintenance are difficult

Images