Structure And Installation Structure of Hydraulic Turbine

Structure and installation structure of hydraulic turbine

Water turbine generator set is the heart of hydropower power system. Its stability and security will affect the stability and security of the whole power system and the stability of power supply. Therefore, we need to understand the structural composition and installation structure of the water turbine, so that it can be handy in normal maintenance and repair. Here is a brief introduction to the structure of a hydraulic turbine.

Structure of hydraulic turbine
Hydro generator is composed of rotor, stator, frame, thrust bearing, guide bearing, cooler, brake and other main components; The stator is mainly composed of frame, iron core, winding and other components; The stator core is made of cold-rolled silicon steel sheets, which can be made into an integral and split structure according to the manufacturing and transportation conditions; The water turbine generator is generally cooled by closed circulating air. The super large capacity unit tends to use water as the cooling medium to directly cool the stator. For the same time, the stator and rotor are double water internal cooling turbine generator units.

Installation structure of hydraulic turbine
The installation structure of hydro generator is usually determined by the type of hydraulic turbine. There are mainly the following types:

1. Horizontal structure
The hydraulic turbine generator with horizontal structure is usually driven by impulse turbine. The horizontal hydraulic turbine unit usually adopts two or three bearings. The structure of two bearings has short axial length, compact structure and convenient installation and adjustment. However, when the critical speed of shafting cannot meet the requirements or the bearing load is large, the three bearing structure needs to be adopted, Most domestic hydraulic turbine generator units are small and medium-sized units, and large horizontal units with a capacity of 12.5mw are also produced. Horizontal hydraulic turbine generator units produced abroad with a capacity of 60-70mw are not rare, while horizontal hydraulic turbine generator units with pumped storage power stations have a single unit capacity of 300MW;

2. Vertical structure
Domestic water turbine generator units are widely used in vertical structure. Vertical water turbine generator units are usually driven by Francis or axial-flow turbines. The vertical structure can be divided into suspended type and umbrella type. The thrust bearing of generator located at the upper part of rotor is collectively referred to as suspended type, and the thrust bearing located at the lower part of rotor is collectively referred to as umbrella type;

3. Tubular structure
The tubular turbine generator unit is driven by the tubular turbine. The tubular turbine is a special type of axial-flow turbine with fixed or adjustable runner blades. Its main feature is that the runner axis is arranged horizontally or obliquely and consistent with the flow direction of the inlet and outlet pipes of the turbine. The tubular turbine generator has the advantages of compact structure and light weight, It is widely used in power stations with low water head.
These are the installation structure and installation structure form of hydraulic turbine. The water turbine generator set is the power heart of the hydropower station. The usual overhaul and maintenance shall be carried out in strict accordance with the rules and regulations. In case of abnormal operation or failure, we must scientifically and reasonably analyze and design the maintenance scheme to avoid greater losses.