A hydraulic turbine is an electrical machine that converts the energy of water flow into rotating mechanical energy. It is a turbine machine among fluid machines.
Hydraulic turbines can be divided into two categories according to their operating principles: impact turbines and impact turbines.
1. Pelton Turbine
Operating principle: The Pelton turbine turbine rotates under the impact of the water flow
It has a retractable nozzle which. can absorb energy from water flow. The kinetic energy converted into high-speed jet is mainly the conversion of kinetic energy.
,2. Impact turbine
Working principle: The runner of the impact turbine responds to the flow of water in the water
and rotates forcefully, working process Potential energy and the kinetic energy of the average flow changes, mainly the conversion of potential energy
Comparison betweenimpact turbine and impact turbine
Content (Hefei Ryodian) Impact Francis Turbine< /p> p>
Machine
(Other companies in the same industry) Impact Turbine impact
Operating principle The impact turbine uses the pressure and kinetic energy of the water flow to do the work< /p>
Impact The hydraulic turbine uses a water flow at high speed to impact the blades to do the work
Ductile iron casting process of structure
Advantages of steel structure welding process
The size of the flow channel of the casting structure is more accurate and the flow path. The surface of the tunnel is smoother, which is beneficial to improve the efficiency of the water turbine.
The steel structure welding cost is low. Process and quality assurance is weak.
The diameter of the water turbine is small
Large
The wind resistance in the cylinderair flow is small (good heat dissipation effect) Large (heat dissipation effect is poor)
Lubrication Oil lubrication of the formal reduction unit
Lubricating the output shaft grease
Equipment efficiency
86.70%
Rated efficiency 95% or more, measured efficiency Setting unknown< /p>
The movable guide vane of the hydraulic turbine itself is adjustable and can be adjusted within the range of 25% of the flow rate corresponding to Yang. , corresponding to the output requirements of different speeds
. There is no adjustment mechanism, what is the residual pressure.
How much power is produced, the speed is fixed
Application
The most widely used water turbine. in the world, its structure is relatively simple and has the highest efficiency
higher than that of the axial flow type.
This type of turbine is used in power plantsat high fall. The change in water height is relatively small and the speed does not change much. Therefore, efficiency is less affected by load changes and the efficiency curve. is relatively flat.
Water height range
The applicable water height range of the Francis turbine is 5 to 700 meters. Small water bucket type is used for water height of 40 to 250 meters.< /p>
Large bucket type is used for water height of 400 to 4500 m
Hello:
——★1 “Due to special circumstances, the water flow impacts the pump impeller to turn the motor”.... ..is cost-effectiveIt uses the “residual magnetism” of the motor to produce electricity. However, due to the weak magnetic field of "residual magnetism" and the low speed, the generated voltage is very low (can be measured with a multimeter).
——★2. The voltage generated using the “residual magnetismel” of the motor is very weak. “If the motor circuit contactor is connected to send power at this time,” there will be no impact. . The water pump will be normal after power on.