CN2733030Y - Hydraulic control multi-nozzle device for impulse turbine - Google Patents

Abstract

The utility model relates to a hydraulic control multi-nozzle device for an impulse water turbine formed in a method that an impact water turbine set is composed of a special governor for a microcomputer, nozzles which are completely controlled by hydraulic pressure and a flow diverter. When the utility model loads off, the utility model can quickly change the direction of water jet without rushing on the bucket type water turbine, and meanwhile, the nozzles can be slowly shut without generating over hydraulic pressure in a diversion conduit, so the utility model can safely and smoothly satisfy the requirements of power quality and guarantee of regulation. The utility model has simple structure and convenient maintenance management and lays a solid base for the development of high automation.

Description

Hydraulic control multi-nozzle device of impact turbine

technical field

The utility model belongs to an operating nozzle and a control device of an impact water turbine in a hydraulic generating set.

Background technique

The impact turbine belongs to the high water head unit. The output of the hydroelectric generating unit is controlled and adjusted through the nozzle. For the high water head unit, the water diversion pressure steel pipe is long and the rated speed of the turbine is high. In order to ensure safe operation, on the one hand, it is necessary to use multiple nozzles to adjust the diameter of the jet to accelerate the speed of the water wheel. On the other hand, the unit requires that the nozzles be closed quickly when the load is shed, so as not to cause the unit to overspeed, but the water diversion pressure steel pipe also requires nozzles Close slowly to avoid damage to the penstock due to water hammer. In order to solve this contradiction, people have adopted the method of controlling the nozzle and the deflector. At present, the methods of controlling the nozzle and the deflector include mechanical levers and cams. In order to prevent the speed of the unit from increasing, at the same time, slowly close the nozzle so that the water pressure steel pipe does not produce a large rise in water pressure. However, due to the complicated operation of the mechanical lever and the cam type, it is easy to fail, so it needs to be improved.

Contents of the invention

The purpose of the utility model is to provide a hydraulically controlled multi-nozzle device for an impact water turbine realized by a special governor for a microcomputer.

The technical scheme of the present utility model is as shown in Figure 1, and nozzle 1, deflector 11 are directly opposite bucket type water turbine at the water outlet of diversion steel pipe 17. According to the size of the load, the number of nozzles 1 and flow deflectors 11 can be arbitrarily input according to 1, 2, and 4. The oil pipe connection ports 8, 9 of the nozzle 1 and the oil pipe connection ports 12, 13 of the flow deflector 11 are adjusted by the oil pipe 16 and the microcomputer. Speed 15 hydraulic device connection.

The technical scheme of the nozzle 1 and the deflector 11 is shown in Figure 2. The left end of the nozzle 1 is a nozzle seat 10, the middle of the nozzle seat 10 is a water inlet, the right end of the nozzle 1 is equipped with a nozzle cover 2, and the nozzle cover 2 is equipped with a nozzle opening. 3. The core of the nozzle 1 has a needle shaft 4, the inner left end of the needle shaft 4 is the feedback cone sleeve 5, and the right end is the spray needle 6, the feedback cone sleeve 5 and the spray needle 6 are connected as one, and the feedback cone sleeve 5 Cooperate with the injection needle feedback rod 7 installed on the side of the nozzle seat 10, when the feedback taper sleeve 5 moves, the injection needle feedback rod 7 will move up and down, and transmit the information to the microcomputer-specific governor 15 to control the oil pipe on the side of the nozzle seat 10 The oil pressure in the pipes of the connection ports 8 and 9 controls the moving position of the spray needle 6, and the spray needle 6 cooperates with the nozzle port 3 to control the diameter of the water jet until it is closed.

The flow deflector 11 is fixed on the nozzle seat 10 and the nozzle cover 2, and the oil pipe connection ports 12 and 13 on the flow deflector 11 are connected with the oil pressure device of the microcomputer-specific governor 15, and the microcomputer-specific governor 15 controls the servomotor of the flow deflector 11 14. During normal operation, the servomotor 14 is always above the diameter of the water jet without interfering with the jet. The adjustment of the output of the impact turbine is realized by changing the diameter of the water jet. The nozzle 6 is responsible for the flow adjustment during normal operation. When the unit needs to shed the load, if the nozzle 6 is closed quickly, the pressure in the water diversion steel pipe 17 will increase sharply. If the height increases, water hammer will be generated and the steel pipe will be damaged. If the injection needle 6 is closed slowly, the transient speed of the unit will increase, resulting in overspeed of the unit. Therefore the utility model is when needing shedding load, and 15 oil pressure devices of microcomputer special-purpose governor supply oil pressure to corresponding oil pipe connection port. Firstly, the servomotor 14 of the deflector 11 changes the direction of the water jet quickly, and at the same time closes the spray needle 6 slowly, so that it can safely and smoothly meet the requirements of power quality and regulation guarantee.

The utility model is a full-hydraulic control multi-nozzle impact water turbine with simple structure and convenient maintenance, which lays a solid foundation for the development in the direction of high automation.

Description of drawings

Figure 1: Schematic diagram of hydraulic control multi-nozzle device for impact turbine

Figure 2: Structural schematic diagram of multiple nozzles and deflectors hydraulically controlled by the impact turbine

Among them: 1. Nozzle 2. Nozzle cover 3. Nozzle mouth

4. Needle shaft 5. Feedback taper sleeve 6. Needle

7. Needle feedback lever 8. Oil pipe connection port 9. Oil pipe connection port

10. Nozzle seat 11. Diverter 12. Oil pipe connection port

13. Oil pipe connection port 14. Servostat 15. Microcomputer-specific governor

16. Oil pipe 17. Water diversion steel pipe

Detailed ways

According to the above plan, in order to prolong the maintenance period of the unit and enhance the reliability of the nozzle, no spring is used in the nozzle 1, and the needle 6 can be stabilized at a certain opening when the unit is running under a stable load. The upper and lower overlap of the main pressure distribution valve of the special governor 15 is just enough to maintain a certain pressure in the needle operation chamber, and the closing force generated by this pressure is just equal to the force of the water at the head of the nozzle 6 tending to open, so The spray needle 6 can be stabilized at this balance position adapted to the external load and satisfy the power quality.

Claims (2)

1, the impulse turbine hydraulic control multiinjector device of forming by diversion steel pipe (17), flow diverter (11) microcomputer special governor (15), it is characterized in that: the water outlet at diversion steel pipe (17) is equipped with nozzle (1), flow diverter (11), oil pipe connection mouth (12), (13) of the oil pipe connection mouth (8) of nozzle (1), (9) and flow diverter (11) are connected by the oil gear of oil pipe (16) with microcomputer special governor (15).

2, according to the described impulse turbine hydraulic control of claim 1 multiinjector device, it is characterized in that: the left end of nozzle (1) is nozzle carrier (10), the right-hand member of nozzle (1) is equipped with nozzle cover (2), be equipped with nozzle (3) on the nozzle cover (2), the core of nozzle (1) has nozzle needle axle (4), the inside left end of nozzle needle axle (4) is a feedback tapered sleeve (5), right-hand member is nozzle needle (6), feedback tapered sleeve (5) links into an integrated entity with nozzle needle (6), feedback tapered sleeve (5) cooperates with the nozzle needle feedback rod (7) that is positioned on nozzle carrier (10) side, nozzle needle (6) cooperates with nozzle (3), the oil pipe connection mouth (8) of the side of nozzle carrier (10), (9) be connected with microcomputer special governor (15) oil gear.