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About the Tubular Turbine Geneator unit that customers often consult recently

Author: source: date: 2019-11-23 10:10:28
Tubular turbine
The tubular turbine is suitable for heads of 3 to 25 m. The water flow channel is linear and is a horizontal axis turbine. The shape of the runner is similar to that of the axial flow runner. Similar to the electric fan blade, the cross-flow turbine runner also has two types of fixed propeller and rotary propeller. The working principle is not here. Introduced again. Since the water flow moves substantially in the axial direction in the flow passage and does not turn, the water passing capacity and hydraulic efficiency of the unit can be improved. Tubular turbines have good hydraulic performance for turbine operation and pump operation. They are especially suitable for tidal power stations. Their two-way power generation, two-way pumping and two-way water discharge are suitable for comprehensive utilization of low head hydraulic resources.
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The units of the tubular turbine mainly include four types: shaft through-flow type, vertical shaft flow type, bulb cross-flow type and full-flow type. Due to the high requirements of the manufacturing process of the full-flow turbine, the application is very small. The first three forms.

Shaft-through tubular turbine
The shaft-through tubular hydro-generator unit adopts horizontal arrangement and oblique installation. The structure is simple, the cost and engineering investment are small, but the efficiency is low. It is widely used in low-head small hydropower stations, and horizontal horizontal type is used. most. Figure 1 is a schematic view of a shaft-through tubular hydro-generator set.
Shaft-through tubular turbine generator set
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Shaft-through tubular turbine generator set

The turbine part of the shaft-through tubular hydro-generator unit mainly comprises a runner chamber, a runner, a guide vane and a control mechanism, and an S-shaped draft tube. The runner main shaft is connected to the generator through a draft tube. Due to the large size and high price of the low-speed generator, the small-sized tubular hydro-generator unit adopts the form of high-speed generator after gear speed increase. The blue-green arrow line in the figure indicates the direction of water flow. The water flow enters in the axial direction, enters the runner chamber through the guide vane, pushes the runner to rotate, and flows through the runner blade, and then discharges through the S-shaped draft tube.
 Shaft tubular turbine

The vertical tubular turbine is installed in a concrete shaft on the upstream side of the turbine. Figure 2 is a vertical tubular turbine.
Shaft tubular turbine
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The turbine part is mainly composed of a vane mechanism, a runner chamber, a runner, and a draft tube. The runner main shaft extends into the concrete shaft and is connected to the generator through a speed increasing device such as a gear box. There is also a generator placed in the upper plant, and the runner main shaft is connected to the generator through a fan gear or a pulley to make the shaft size smaller.

The blue-green arrow line in the figure indicates the direction of water flow. After the water flow enters, it passes from both sides of the concrete shaft and then collects to the guide vane to enter the runner chamber. The water flow pushes the runner to rotate and work out from the draft tube. In order to see the flow direction more clearly, the unit diagram of the upper part of the concrete structure is shown in Fig. 3. The blue-green arrow line in the figure indicates the flow direction of the water.

The vertical tubular turbine has simple structure, low cost, convenient operation and maintenance, but low efficiency, and is widely used in low-head small hydropower stations.
Bulb tubular turbine
The generator seal of the bulb tubular turbine is installed in a bulb-type metal casing on the upstream side of the turbine, the generator is installed horizontally, and the engine shaft is directly connected to the turbine runner. Figure 4 is a schematic view of a bulb tubular turbine.
Bulb Tubular Turbine Unit
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The turbine part of the bulb tubular turbine consists of a runner chamber, a vane mechanism, a runner, and a draft tube; the generator shaft is directly connected to the runner, and is mounted on the steel bulb casing, and the generator is in the bulb casing. The runner is at the end of the bulb, the generator bearing is fixed on the bulb casing through the bearing support ring, the runner end bearing is fixed on the bulb tail casing, and the generator shaft front end is connected to the motor slip ring and the runner pitch control oil path. Device. The steel bulb is fixed in the concrete foundation by the upper pillar and the lower pillar, and the upper pillar is also a passage for the person to enter and exit the bulb.

The bulb tubular turbine has compact structure, good stability and high efficiency, and is suitable for low-head large and medium-sized hydropower stations.
Due to the current development of medium and high head hydropower resources, most of the hydropower resources that can be developed are low water heads. Tubular turbines are suitable for low head applications, and high efficiency and low investment. In recent years, they have developed rapidly and the power is increasing. At present, China's largest bulb tubular turbine unit is the Qiaogong hydropower station put into operation in 2009, with a single unit capacity of 57,000 KW; China's hydropower technical engineer helped Brazil to build the world's largest bulb tubular turbine unit up to 75,000 KW; The world's largest vertical cross-flow turbine unit has a capacity of 25,000 KW.

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