CN205779420U - Deceleration arrangement under load condition abandoned by a kind of Pelton wheel - Google Patents

Abstract

The utility model discloses a deceleration arrangement structure of a water bucket type hydraulic turbine under the condition of dumping load, which comprises a runner provided with blades, and a pressure pipe main pipe providing impact water flow at least one way; the water outlet end of the pressure pipe main pipe is equipped with a main nozzle, The water flow ejected from the main nozzle can impact the working surface of the blade to generate a rotational moment; it is characterized in that it also includes at least one pressure pipe deceleration branch pipe that provides decelerated water flow, and a deceleration plate arranged on the runner; the pressure pipe deceleration branch pipe A deceleration nozzle is installed at the water outlet, and the deceleration water flow ejected from the deceleration nozzle can impact the working surface of the deceleration plate to generate a reverse torque. The beneficial effects of the utility model are: the reducer of the utility model has a direct action mechanism and an ingenious structure. Under load shedding conditions, the Pelton turbine generates torque in the opposite direction, which reduces the speed of the runner and avoids the dangerous condition of overspeed load shedding.

Description

A deceleration arrangement structure of a water bucket turbine under the condition of shedding load

technical field

The utility model belongs to the technical field of hydroelectric power generation, and in particular relates to a deceleration arrangement structure of a bucket type water turbine under load shedding conditions.

Background technique

In a hydropower station using bucket turbines, if the main equipment fails (speed control system failure or generator set bearing overheating, etc.) or due to short circuit of the transmission line or busbar, the hydropower station needs to discard all or part of the load. Under the condition of shedding load, the speed of the unit will increase correspondingly, and it is in the safety angle of the hydropower station. At this time, the increase of the speed of the unit should be reduced as much as possible, and the speed of the unit should be slowed down to the preset safe speed range of the turbine or Stop turning. For the reduction of the speed of the bucket turbine, it is often used to add a baffle near the nozzle to slowly close the nozzle needle valve, reduce the water hammer pressure, and avoid the increase of the speed of the unit. Although this method can achieve the purpose of deceleration, the mechanism of action is relatively indirect, and the adjustment takes a long time, the degree of control is relatively limited, and the requirements for the regulation of the baffle are relatively high, which increases the difficulty of deployment and implementation.

Utility model content

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a deceleration arrangement structure of a bucket type turbine under the condition of load shedding, which directly applies a reverse torque through the deceleration plate to improve the deceleration effect, and is easy to control.

In order to solve the problems in the prior art, the utility model discloses a deceleration arrangement structure of a water bucket type turbine under the condition of dumping load, which includes a runner provided with blades, and a pressure pipe main pipe that provides impact water flow at least one way; the pressure pipe main pipe The water outlet is equipped with a main nozzle, and the water jetted from the main nozzle can impact the working surface of the blade to generate a rotational moment; it also includes at least one pressure pipe deceleration branch pipe that provides decelerated water flow, and a deceleration plate arranged on the runner; the pressure pipe The water outlet end of the deceleration branch pipe is equipped with a deceleration nozzle, and the deceleration water flow ejected from the deceleration nozzle can impact the working surface of the deceleration plate to generate a reverse torque.

Preferably, a main control valve for controlling the flow of impacting water flow is installed on the main pipe of the pressure pipeline, and a branch control valve for controlling the flow of decelerating water flow is installed on the deceleration branch pipe of the pressure pipeline. The valve opening can be controlled through the electronic operating system, and then the flow rate of the deceleration nozzle can be controlled.

Preferably, a baffle is provided in front of the main nozzle. The baffle can slowly close the needle valve of the nozzle according to the impact water flow intensity of the main nozzle, reduce the water hammer pressure, and realize the auxiliary deceleration of the unit.

Preferably, the speed brake is arranged between two adjacent blades.

Preferably, the deceleration plate, the main nozzle and the deceleration nozzle are all made of metal materials. This can ensure that the above-mentioned device will not fail in structural strength under the action of the water body, and the main nozzle and the deceleration nozzle can be disassembled for maintenance and replaced regularly.

Preferably, the main pipe of the pressure pipe is connected with the deceleration branch pipe of the pressure pipe through a tee, so that both pipes are supplied with water by the same water pump and the trouble of laying additional pipes is avoided.

Preferably, the speed brake is rectangular and has a height greater than that of the blades so as to increase the effective working area. The deceleration plate and the deceleration branch pipe of the pressure pipe are connected through the deceleration water body. This structural design endows the decelerator with coordination and consistency.

The utility model has the beneficial effects: the reducer of the utility model has a direct action mechanism and an ingenious structure. Under load shedding conditions, the Pelton turbine generates torque in the opposite direction, which reduces the speed of the runner and avoids the dangerous condition of overspeed load shedding. The use of branch control valves not only facilitates the opening and closing of the deceleration work, but also controls the required flow rate of the deceleration water body, which is more widely applicable to various working conditions, making the operation and scheduling of the hydropower station more efficient; and the deceleration nozzles and other components can also be used The utility model can be easily dismantled, overhauled and replaced regularly, is convenient and practical, and has good market promotion prospect.

Description of drawings

Fig. 1 is a schematic diagram of a specific embodiment of a speed reducer of the utility model under load shedding condition of a bucket type turbine.

Reference signs:

1 pressure pipe deceleration branch; 2 deceleration plate; 3 deceleration nozzle; 4 branch control valve; 5 pressure pipe main; 6 main control valve;

detailed description

Below in conjunction with accompanying drawing, the utility model is further described. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

As shown in FIG. 1 , the deceleration arrangement structure of the bucket turbine in the load shedding condition of the present invention includes: the original runner 9 , and at least one pressure pipe main pipe 5 that provides the water flow for driving the runner. The water outlet end of the main pipe of the pressure pipe is equipped with a main nozzle, and the water flow ejected from the main nozzle hits the working surface of the runner blade 10 to realize the continuous rotation of the runner. A main pipe control valve 6 is also installed on the pressure pipeline main pipe 5 to be used for adjusting the size of the water flow that drives the runner to rotate. Pressure pipe deceleration branch pipe 1 and deceleration plate 2. The pressure pipe deceleration branch pipe 1 is formed by the lateral branch of the pressure pipe main pipe 5 through a three-way structure. Under normal operating conditions of the bucket type turbine, the rear end of the control valve in the pressure pipe deceleration branch pipe 1 is filled with body of water.

A deceleration nozzle 3 is installed at the water outlet of the deceleration branch pipe 1 of the pressure pipeline, and a branch pipe control valve 4 is installed on the pipe body to adjust the flow rate of the deceleration water body.

Under the load shedding condition of the water bucket turbine, starting the conventional baffle plate 8 located near the main nozzle 7 and starting the branch pipe control valve 4 at the same time can make the pressure pipe decelerate. Nozzle 3 shoots out. The branch pipe control valve 4 is stably and reliably installed on the deceleration branch pipe 1 of the pressure pipeline, and the opening of the valve can be controlled through the electronic operating system, thereby controlling the output flow of the deceleration nozzle.

The water sprayed from the deceleration nozzle 3 impacts on the deceleration plate 2, and exerts a reverse torque on the runner 9 where the deceleration plate 2 is located, so that the speed of the runner 9 is further reduced.

In order to prevent pressurized water from leaking from the pipeline during the use of the reducer, the decelerating branch pipe 1, the decelerating nozzle 3 and the branch pipe control valve 4 are all made of metal materials.

The use of the branch control valve 4 can facilitate the opening and closing of the reducer, and can also control the required flow rate of the decelerating water body, which is more widely applicable to various working conditions. The deceleration nozzle 3 and the main nozzle 7 of the speed reducer can also be easily disassembled for maintenance and regular replacement, which is flexible and practical.

In the utility model, the main pipe of the pressure pipeline can be provided with multiple channels so as to impact the working surface of the blade 10 from different directions to increase the driving force. Similarly, the branch pipes of the pressure pipeline can also be provided with multiple channels to increase the deceleration force. It is more widely applicable to a variety of working conditions, making the operation and scheduling of hydropower stations more efficient; and parts such as nozzles can also be easily disassembled for maintenance and regular replacement, which is convenient and practical, and has a good application prospect.

The above description is only the preferred embodiment of the utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and deformations can also be made. And deformation should also be regarded as the protection scope of the present utility model.

Claims (7)

1. A deceleration arrangement structure of a bucket type water turbine under load shedding conditions, including a runner provided with blades, and at least one pressure pipe main pipe providing impact water flow; a main nozzle is installed at the water outlet end of the pressure pipe main pipe, and the main nozzle sprays The water flow out can impact the working surface of the blade to generate a rotational moment; it is characterized in that it also includes at least one pressure pipe deceleration branch pipe that provides decelerated water flow, and a deceleration plate arranged on the runner; the outlet end of the pressure pipe deceleration branch pipe is installed There is a deceleration nozzle, and the deceleration water flow ejected from the deceleration nozzle can impact the working surface of the deceleration plate to generate a reverse torque. 2. The deceleration arrangement structure of a bucket type water turbine under the condition of load shedding according to claim 1, wherein a main control valve for controlling the impact water flow is installed on the main pipe of the pressure pipeline, and a deceleration branch pipe of the pressure pipeline is installed Branch control valve to control the flow rate of decelerated water stream. 3. The deceleration arrangement structure of a bucket type water turbine under load shedding conditions according to claim 2, wherein a baffle is also provided in front of the main nozzle, and the baffle can be adjusted according to the impact of the main nozzle. The water flow intensity controls the opening degree of the main nozzle for auxiliary deceleration. 4. The deceleration arrangement structure of the bucket turbine under the load shedding condition according to claim 3, wherein the deceleration plate is arranged between two adjacent blades. 5. The deceleration arrangement structure of the bucket type turbine under the load shedding condition according to claim 4, wherein the deceleration plate, the main nozzle and the deceleration nozzle are all made of metal materials. 6 . The deceleration arrangement structure of the bucket type turbine under the load shedding condition according to claim 5 , wherein the main pipe of the pressure pipeline and the deceleration branch of the pressure pipeline are connected through a tee. 7 . 7. The deceleration arrangement structure of a bucket turbine under load shedding conditions according to claim 6, wherein the deceleration plate is rectangular and has a height greater than that of the blades so as to increase the effective working area.