CN203189195U - Water turbine paddle internal energy driving and adjusting structure - Google Patents

Abstract

The utility model provides a water turbine paddle internal energy driving and adjusting structure which comprises a pressure energy storage system, an operating system and an execution system, wherein the pressure energy storage system comprises an oil tank, an energy storage, an oil pump and a pressure automatic control link, the operating system comprises a digital valve and a displacement sensor, and the execution system comprises an operating link arm and a paddle servomotor. The pressure energy storage system, the operating system and the execution system are respectively installed inside a paddle hub. The energy storage, the oil pump and the digital valve are horizontally and concentrically arranged and directly connected to the paddle servomotor through oil-conveying pipelines. Electric signals of a paddle is led out through an inner cavity cable slipping ring of a main shaft and connected to a control system to be controlled. Due to the fact that the pressure energy storage system, the operating system and the execution system are used for adjusting the paddle and all installed inside the paddle hub, the problems that sealing is poor and oil is leaked in the process that external hydraulic energy is transmitted to a rotary energy-receiving original part are solved, and the problem that oil pressure of rotary sealing transmission operations is limited is solved.

Description

Internal Energy Driven Adjustment Structure of Turbine Blades

technical field

The invention belongs to the technical field of water turbines, and in particular relates to an internal energy drive adjustment structure of a water turbine blade.

Background technique

At present, domestic and foreign water turbine blade adjustment technologies all use external pressure oil supply, through the oil receiver to realize the transition between the fixed and rotating parts, and transmit the high-pressure oil to the piston and oil cylinder arranged in the servomotor inside the blade hub to achieve the adjustment of the blade. Purpose. In the conventional design of the blade adjustment structure, only the servomotor is inside the hub, as shown in Figure 1. Its working principle is that the oil in the external oil storage tank is filled into the accumulator through the oil pressure system, and the oil pipeline of the accumulator is supplied to the digital valve. The measured and given signal is input to the PLC, and the PLC sends an operating electric pulse to operate the opening and closing oil circuit of the digital valve, and then the pressure oil is transmitted to the rotating main shaft through the fixed and rotating oil distributor (oil receiver) to operate the oil pipe , through the main shaft to operate the oil pipe to the servomotor of the turbine runner, and finally adjust the blades through the reciprocating motion of the servomotor. Because the adjustment of the paddle requires a lot of operating work, and the conventional structure must use a large amount of oil supply to realize the transmission of large operating work due to the low oil pressure, so it requires a few cubic meters of oil collection tank and 10-100KW The pressure oil device provides the supply of pressure oil and requires a larger diameter oil delivery pipeline. Due to the sealing and lubrication of the oil receiver system for rotating and fixed oil delivery, the high oil pressure supply cannot be achieved, so the oil pressure of the oil cylinder operated by the rotary wheel Restricted, the general design is 2.5MPa, and the volume of the oil receiver and the servomotor are large. In addition, the conventional design of the blade adjustment structure, the inside of the hub is filled with pressure oil, and the oil storage capacity of the general fuel tank is more than 3 tons, so there is an oil leakage phenomenon, and it has an impact on the environment.

Contents of the invention

The purpose of the invention is to provide a water turbine blade internal energy drive adjustment structure, the pressure energy storage system, operating system and execution system for adjusting the blade are all installed inside the blade hub, which solves the problem of external hydraulic energy Problems of poor sealing and oil leakage during the transmission of the rotating energy-receiving element, as well as the problem of limited oil pressure in the transmission operation of the rotating seal.

The specific technical scheme created by the present invention is as follows: the internal energy drive adjustment structure of the water turbine blade includes a pressure energy storage system, an operating system and an execution system, wherein the pressure energy storage system includes an oil tank, an energy storage device, an oil pump and an automatic pressure control link. The system includes digital valves and displacement sensors, and the execution system includes operating connecting arms and blade servomotors. The pressure energy storage system, operating system, and execution system are all installed inside the blade hub. The energy storage, oil pump, and digital valve are horizontal Arranged concentrically and directly connected to the blade servomotor through the oil pipeline, the electrical signal of the blade is led out through the inner cavity cable slip ring of the main shaft and connected to the control system for control.

The internal energy drive adjustment structure of the turbine blade adopts a safe voltage lower than 36V for power supply and signal transmission.

Beneficial effects of the present invention: compared with the external energy-driven paddle adjustment structure in the prior art, the present invention installs the pressure energy storage system, the operating system, and the execution system for adjusting the paddle inside the paddle hub , the electrical feedback signal of the blade and the operation signal of the governor are drawn out through the cable in the inner cavity of the main shaft and connected to the slip ring. Since the core of the design is transferred to the inside of the runner hub and a sealed oil tank is used, the non-oil-filled body inside the hub will not appear The problem of oil leakage has solved the problem of sealing and lubrication during the transmission of external hydraulic energy to the rotating energy-receiving element, and the limitation of operating oil pressure due to fixed and rotating seal transmission has been solved. At the same time, the operating oil pipe and external pressure oil of the main shaft have been cancelled. The system's piping and complex oil receiver structure simplifies design, manufacture, installation and maintenance; due to the use of a safe voltage lower than 36V for power supply and mutual transmission of power signals, the condensation caused by the temperature difference between the inside and outside of the hub is eliminated. The impact of electrical performance; in addition, the internal energy structure design can increase the oil pressure to 16-25MPa, so the operating oil volume is 1% of the conventional one. The structural volume is only 5% of the original structural volume.

The present invention also has significant economic benefits. The comprehensive design cost of a 3000kw hydroelectric generator can be reduced by 100,000 yuan; The cost per ton is reduced by 150,000 yuan; the cost of supporting equipment is 50,000 yuan; the oil investment is reduced by 70,000 yuan; the power consumption of the oil pressure device is saved by 22kw*5000h*0.5 yuan=50,000 yuan; the total is 770,000 yuan. Domestic 10,000-30,000 kw units are widely used, and each set can save 1.5 million yuan in costs. There are 300 sets produced in the country every year, which can reduce 450 million yuan in costs and energy consumption. The enterprise and social benefits are considerable, and it also has extensive significance for environmental protection, energy saving and emission reduction.

To sum up, the internal energy drive adjustment structure of the blade is simplified, the economic and social benefits are huge, the technology is feasible, and it has great research and promotion significance. This technology can be widely applied to blade adjustment of wind turbines and related fields, and has wide practicability. It is a major innovation in the field of water turbine manufacturing.

Description of drawings

Figure 1 is a schematic diagram of a conventionally designed paddle adjustment structure.

Fig. 2 is a schematic structural diagram of the invention.

1-accumulator; 2-digital valve; 3-oil receiver; 4-spindle; 5-operation oil pipe (outer); 6-operation oil pipe (inner); 7-blade servomotor; 8-displacement sensor; 9 - oil pipeline; 10 - oil pump; 11 - oil pipeline; 12 - operation connecting arm; 13 - cable.

Detailed ways

As shown in Figure 2, the internal energy drive adjustment structure of the turbine blades includes a pressure energy storage system, an operating system, and an execution system. Including the digital valve 2 and the displacement sensor 8, the execution system includes the operation connecting arm 12 and the blade servomotor 7, the pressure energy storage system, the operating system and the execution system are all installed inside the blade hub, the accumulator 1, the oil pump 10, The three digital valves 2 are horizontally arranged concentrically and are directly connected to the propeller servomotor 7 through the oil pipelines 9 and 11. The electrical signal of the propeller is led out to the control system through the inner cavity cable 13 slip ring of the main shaft 4 for control.

The internal energy drive adjustment structure of the turbine blade adopts a safe voltage lower than 36V for power supply and signal transmission.

Working principle: The oil pump 10 automatically controls the signal through the automatic pressure control link. When the pressure drops, the oil pump 10 starts, and at the same time fills the accumulator 1 with oil until the pressure reaches the set value and stops. The oil pipe of the accumulator 1 is connected to the oil source interface of the digital valve 2, the other two interfaces of the digital valve 2 are connected to the interface of the propeller servomotor 7, and the other interface of the digital valve 2 is connected to the fuel tank. When an open or close operation signal is given from the outside, the digital valve 2 receives the operation signal to start opening or closing the cavity, and the pressure oil is supplied to the right (or left) chamber of the propeller servomotor 7 through the oil passage opened by the digital valve 2, and the propeller The pressure oil in the left (or right) chamber of the servomotor 7 is released to the oil tank through another oil channel of the digital valve 2. Due to the pressure imbalance between the left and right chambers of the blade servomotor 7, the piston is displaced, and the displacement is determined by The displacement sensor 8 feeds back the displacement signal to the outside, and the outside sends out a new control signal after comparing with a given value to control the piston to reach a new balance point. The transmitted signal is realized through the electric cable 13 on the main shaft 4 and the sliding contact of the slip ring.

Claims (2)

1. can drive in the water turbine blade and adjust structure, comprise the pressure energy storing system, operation system and executive system, wherein the pressure energy storing system comprises fuel tank, accumulator (1), oil pump (10) and pressure automatic control link, operation system comprises digital valve (2) and displacement transducer (8), executive system comprises operation link arm (12) and blade servomotor (7), it is characterized in that: the pressure energy storing system, operation system and executive system are installed in the inside of blade wheel hub, accumulator (1), oil pump (10), the horizontal concentric arrangement of digital valve (2) three is also passed through pipeline road (9,11) directly be connected to blade servomotor (7), the electric signal of blade is drawn Access Control System and is controlled by inner chamber cable (13) slip ring of main shaft (4).

2. can drive in the water turbine blade as claimed in claim 1 and adjust structure, it is characterized in that: comprise and adopt the safety voltage that is lower than 36V to power and the signal transmission.

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