According to China’s “rules for the preparation of hydraulic turbine model”, the model of hydraulic turbine is composed of three parts, and each part is separated by a short horizontal line “-”. The first part is composed of Chinese Pinyin letters and Arabic numerals, in which Pinyin letters represent water. For turbine type, Arabic numerals indicate runner model, the model of runner entering the profile is the specific speed value, the model of runner not entering the profile is the number of each unit, and the old model is the number of model runner; For reversible turbine, add “n” after the turbine type. The second part is composed of two Chinese Pinyin letters, which respectively represent the arrangement form of turbine main shaft and the characteristics of Headrace chamber; The third part is the nominal diameter of turbine runner and other necessary data. The common representative symbols in the turbine model are shown in table 1-2.
For impulse turbines, the third part above shall be expressed as: nominal diameter of runner (CM) / number of nozzles on each runner × Jet diameter (CM).
The nominal diameter of runner of various types of hydraulic turbines (hereinafter referred to as runner diameter, commonly expressed) is specified as follows
1. The runner diameter of Francis turbine refers to the * * * diameter of the inlet side of its runner blade;
2. The runner diameter of axial flow, diagonal flow and tubular turbines refers to the runner indoor diameter at the intersection with the runner blade axis;
3. The runner diameter of impulse turbine refers to the pitch diameter of the runner tangent to the jet centerline.
Example of turbine model:
1. Hl220-lj-250 refers to the Francis turbine with runner model of 220, vertical shaft and metal volute, and the runner diameter is 250cm.
2. Zz560-lh-500 refers to the axial flow paddle turbine with runner model 560, vertical shaft and concrete volute, and the runner diameter is 500cm.
3. Gd600-wp-300 refers to the tubular fixed blade turbine with runner model of 600, horizontal shaft and bulb diversion, and the runner diameter is 300cm.
4．2CJ20-W-120/2 × 10. It refers to the bucket turbine with runner model of 20. Two runners are installed on one shaft. The diameter of horizontal shaft and runner is 120cm. Each runner has two nozzles and the jet diameter is 10cm.
Subject: [hydropower equipment] hydro generator
1、 Generator type and force transmission mode(I) suspended generator thrust bearing is located above the rotor and supported on the upper frame.
The power transmission mode of the generator is:
Weight of rotating part (generator rotor, exciter rotor, water turbine runner) – thrust head – thrust bearing – stator housing – base; Weight of fixed part (thrust bearing, upper frame, generator stator, exciter stator) – stator shell – base.suspended generator (II) umbrella generator thrust bearing is located under the rotor and on the lower frame.
1. Ordinary umbrella type. There are upper and lower guide bearings.
The power transmission mode of the generator is:
Weight of rotating part of the unit – thrust head and thrust bearing – lower frame – base. The upper frame only supports the upper guide bearing and exciter stator.
2. Semi umbrella type. There is an upper guide bearing and no lower guide bearing. The generator usually embeds the upper frame below the generator floor.
3. Full umbrella. There is no upper guide bearing and there is a lower guide bearing. The weight of the rotating part of the unit is transmitted to the top cover of the water turbine through the support structure of the thrust bearing and to the stay ring of the water turbine through the top cover.
Post time: Dec-06-2021
