| After-sales Service: | Yes |
|---|---|
| Warranty: | 1 Year |
| Output Type: | AC Three Phase |
| Size: | Large |
| Type: | Horizontal Hydro Generator |
| Bearing Support: | Umbrella Type |
| Customization: |
|---|
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Audited Supplier | No. | ||
| 1 | Water head | 60m |
| 2 | Water flow | 2.13 m³/s |
| 3 | Capapcity | 1000kw |
| 4 | Efficiency | 89%-95% |
| 5 | Frequency | 50Hz/60Hz |
| 6 | Power factor | 0.8 |
| 7 | Rated efficiency | 95% |
| 8 | Excitation mode | Brushless |
| 9 | Color | Customized |
Brief introduction of turbine structure and main component
1. Water inlet parts
Water inlet parts consist of Z941H-10C-700 motorized gate valve and φ700 expansion joint. Gate valve is used to close the unit in static water when need stop, it is also used to close the unit and cut the water flow in dynamic water when the unit is in emergency and turbine distributor break down. Expansion joint is used for installation error compensation and convenient for dismantle when maintenance. A drain valve is located at the bottom of expansion joint.
2. Spiral case
Spiral case is casting welding part, equipped with fixed guide vane in it. Spiral case shall make the water become number of swirl of water flow and guide water to flow regularly into guide vane apparatus and runner along circumference. It is equipped with an air relieve valve on the top of spiral case to exhaust air when filling water initially.
3. Turbine distributor
It consists of guide vane, guide vane lever, shaft sleeve, front cover, back cover, etc. It can form or change number of swirls of water flow to adjust turbine discharge according to variation of load. It is also used to normal and emergency shut down. The shape, dimensions, quantity and position of the 12 guide vanes is similar to the accepted model turbine, shall ensure the water flow won't cause vibration during operating. Diameter of spacing circle of guide vane is 720 mm. The guide vane has the hydraulic torque performance of self-close trend within the range from full opening to near no-load opening. The maximum opening of guide vane shall have certain margin. Stop block is equipped for each guide vane, the guide vane can be controlled to swing with certain range and won't hit with other guide vanes when the shear pin is broken. The guide vane is made of ZG06Cr13Ni4Mo, they shall be interchangeable. Each guide vane is machined precisely; the contacting line of adjacent guide vanes shall be finished to ensure perfect contact of all guide vanes under closing state in order to reduce water leakage. The bearings for guide vane shaft and distributor shaft are self-lubricated sliding bearings; the bearing shoe adopts steel back complex material. Use guide vane lever end cover and bolt to adjust and keep the position of each guide vane to the front cover and the rear cover. The sealing is located on upper guide vane shaft to cut the flow. The control ring is welded by steel plate as a whole. Circular guiding rail and wiring plate with lubricating performance are located on the bottom surface of the control ring. The control ring has enough strength and rigidity, won't occur excessive bending due to unbalance stress of servomotor.
4. Runner
Runner is cast and welded as a whole, crown, band and blade is made of stainless steel ZG06Cr13Ni4Mo which has perfect performance of anti-cavitation, anti- corrosion and weldable. Shape of each runner blade shall be machined according to standard GB/T 10969 "Specifications for water passage components of hydraulic turbines". The runner is welded and heat treated according to special specification, subject to non-destructive inspection according to relative standard. The runner is subject to static balance testing after machining. Ten Φ24 holes are located on runner crown in order to reduce the pressure applied on runner by the water.
5. Main shaft service sealing
Main shaft service sealing is packing set, located on main shaft pass through the front cover. The service sealing is close, anti-friction, simple, easy to observe, maintenance and replace. Stainless steel wearing ring is located where the main shaft contacting with the packing. The packing is made of reinforced PTFE, anti-friction, anti-corrosion.
6. Main shaft part
It consists of main shaft, fly wheel, etc. This type of hydraulic power generating unit adopts four fulcrums construction. Main shaft is made of 45# quality carbon construction steel. Disc type cast fly wheel transient stabilizes the unit when adjusting. Connect the main shaft and the runner by flat key to satisfy the interchangeable. Connect the turbine and generator by spring coupler for easy installation.
7. Draft tube assembly
Draft tube assembly consists of air admission connecting pipe, draft tube elbow and draft tube cone, guide the water flow into lower stream, make use of the potential energy of water flow at suction height, recycle major kinetic energy of the flow at runner outlet by its diffusion. All connecting flange shall be sealed, immersed depth of draft tube shall not be less than 30cm to prevent air entering draft tube. Air admission device: Natural air is filled to lower of runner through the top of draft tube to ensure steady operation of turbine when the guide vane under partial opening.
8. Bearing
Front bearing is radial thrust sliding bearing to bear radial and axial load. The thrust disc rotate, the oil pass through oil board then supply cooling and lubricating for the bearing shoe and thrust bearing shoe. Cooler is located at the bottom of bearing to reduce the temperature. Cooling water is from clean water tank, water pressure is 0.15 to 0.2MPa. Water filter is located in cooling piping. Two thermometers are located on front bearing for supervising the temperature of thrust shoe and bearing shoe.
Back bearing is radial bearing to bear radial load. Oil disc carry the oil for lubricating. One thermometer is located for supervising the temperature of bearing shoe. Cooling device is located at the bottom.
Use 46# turbine oil for bearing lubricating.
9. Servomotor assembly
It consists of servomotor, fork and control ring.
Governor adjusts the opening of guide vane through servomotor, fork and control ring according to the change of load.
10. Pressure gauge and vacuum gauge
Pressure gauge is located on spiral case for observing the pressure in spiral case. Vacuum gauge is located on draft tube elbow for observing the degree of vacuum. Valves shall be equipped on pressure gauge and vacuum gauge piping for close and open the piping.
11. Braking device
It adopts 2 hydraulic piston type brakes, service pressure is 0.5~0.7 MPa.
Adopt hydraulic principle for the brake. Provide oil through seamless steel pipe to the brake, push the brake to rub the fly wheel to stop the unit. In case there is oil leakage during operating, adopt appropriate method to solve it, such as tighten the loose nut by spanner or replace sealing material. The stroke of piston is 25mm. Adopt braking only when unit speed drops to below 30 % of rated speed!
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