CN203532152U - Pressure regulating device of hydropower station - Google Patents

Abstract

The utility model discloses a pressure regulating device of a hydropower station. The device comprises a water turbine set installed on a water intake main pipe. The branch pipe is provided with a cone valve, the inlet of the cone valve is connected with the branch pipe, the outlet of the cone valve is connected with the downstream river of the power station through the pipeline; the adjustment device of the cone valve is connected with the governor of the power station through the hydraulic pipeline. The utility model has the characteristics of small hydraulic loss of the flow channel and reliable structure. It also takes into account the function of decentralizing ecological flow, which saves investment and facilitates hub layout.

Description

A pressure regulating device for a hydropower station

technical field

The utility model relates to a pressure regulating device of a hydropower station, in particular to a pressure regulating device of a hydropower station with a cone valve used in the hydropower station for pressure regulation and ecological discharge, and belongs to the technical field of hydropower station protection.

Background technique

Pressure regulating wells and pressure regulating valves are a kind of safety measures for hydropower stations with long pressure water diversion system to prevent the increase of volute pressure caused by unit load shedding. When the pressure diversion pipeline ΣLV/H is greater than 15 to 30, it is necessary to install pressure relief facilities. The civil engineering of the pressure regulating well is large and the construction period is long. The pressure regulating valve is used to save investment and shorten the construction period. However, the pressure regulating valve currently used The function is single, the flow adjustment cannot be performed, and it is not safe, so it is not widely used. At present, reservoirs are required to release ecological flow to ensure uninterrupted flow from the dam to the powerhouse of the hydropower station without affecting the ecology. Therefore, the original pressure regulating valve can only be used as a pressure regulating valve, and cannot also be used as a discharge of ecological flow.

Contents of the invention

The purpose of this utility model is to provide a technical water supply system and water supply scheme of a hydroelectric generator set in a river with many sediments, that is, to provide a pressure regulating device of a hydropower station, which can control the opening and closing time and the opening and closing time of the valve according to the specific conditions of different power stations. degree, so as to eliminate the pressure rise caused by the load rejection of the water turbine unit, so as to overcome the deficiencies of the existing technology.

The technical scheme of the utility model is constituted as follows: a pressure regulating device of a hydropower station of the utility model is that the device includes a water turbine set installed on the water intake main pipe, and the water intake main pipe at the front end of the water turbine set is provided with a main water inlet valve, There is a branch pipe on the water intake main pipe at the front end of the main water valve; there is a cone valve on the branch pipe, the inlet of the cone valve is connected to the branch pipe, and the outlet of the cone valve is connected to the downstream river of the power station through the pipeline; The pipeline is connected with the governor of the power station.

In the aforementioned device, the governor of the power station is connected to the servomotor of the guide vane of the water turbine through a hydraulic pipeline, and the servomotor of the guide vane of the water turbine is connected to the guide vane of the water turbine.

Compared with the prior art, the existing pressure regulating valves of hydropower stations generally only have the function of releasing the load shedding flow of the unit. For different hydropower stations, the hub layout is completely different, which cannot meet the operation requirements of different hydropower stations as decentralized ecological flow valves. The utility model is equipped with a cone valve, a power station governor and a hydraulic device. Through the adjustment guarantee calculation of different hydropower stations, the opening degree and time control of the cone valve can be controlled according to different situations. The position where the ecological flow is released, if the unit has a load shedding, the discharge valve is opened through the joint action of the power station governor and the hydraulic device to the opening that needs to discharge the flow, and the time is determined according to the adjustment and maintenance calculation. , the opening of the cone valve is closed to the position of releasing the ecological flow, which can effectively eliminate the pressure rise caused by the load shedding of the unit and lower the ecological flow. The utility model adopts a conical valve to be linked with a governor and a hydraulic device. It has the characteristics of small hydraulic loss in the flow channel and reliable structure. It also takes into account the function of decentralizing ecological flow, which saves investment and facilitates hub layout.

Description of drawings

Fig. 1 is the structural representation of the utility model.

The marks in the attached drawings are: 1-water intake main pipe, 2-water turbine unit, 3-water inlet main valve, 4-branch pipe, 5-cone valve, 6-pipeline, 7-regulating device, 8-hydraulic pipeline, 9 -power station governor, 10-turbine guide vane servomotor, 11-turbine guide vane.

Detailed ways

The utility model will be described in further detail below in conjunction with the accompanying drawings, but not as any limitation to the utility model.

The utility model is constructed according to the following method of using a cone valve in a hydropower station for pressure regulation and ecological discharge. The method is to install a cone valve 5 on the branch pipe 4 of the water intake main pipe 1. The outlet of the power station is led to the downstream river channel of the power station through the pipeline 6, and the calibers of the branch pipe 4 and the cone valve 5 are determined by the discharge ecological flow rate and the maximum flow rate to be released for load shedding. The adjusting device 7 of the cone valve 5 is connected with the governor 9 of the power station through a hydraulic pipeline 8 . The power station governor 9 controls the cone valve 5 through the hydraulic pipeline 8, and the power station governor 9 is controlled electrically. Under normal circumstances, the cone valve 5 is at the opening of the ecological flow; when the load shedding of the power station is running, and the speed of the water turbine unit 2 rises to the set safe value (the speed of the water turbine unit is slightly lower than the maximum speed increase value), the power station will The governor 9 controls the cone valve 5 to increase the opening to the opening that needs to discharge the flow, so as to control the speed of the water turbine unit 2 to continue to rise, and reduce the damage of the water hammer to the pressure water diversion system; when the speed of the water turbine unit 2 decreases to the rated After the speed, the governor 9 of the power station controls the cone valve 5 to reduce the opening to the opening of the lowered ecological flow.

The structural diagram of a pressure regulating device of a hydropower station of the present invention constructed according to the above method is shown in Figure 1. The device includes a water turbine unit 2 installed on the water intake main pipe 1. The water main valve 3 and the water intake main pipe 1 at the front end of the water inlet main valve 3 are provided with a branch pipe 4; the branch pipe 4 is provided with a cone valve 5, the inlet of the cone valve 5 is connected with the branch pipe 4, and the outlet of the cone valve 5 is through a pipeline 6 is connected to the downstream river of the power station; the adjustment device 7 of the cone valve 5 is connected to the governor 9 of the power station through the hydraulic pipeline 8 . The power station governor 9 is connected to the hydraulic turbine guide vane servomotor 10 through the hydraulic pipeline 8, and the hydraulic turbine guide vane servomotor 10 is connected to the hydraulic turbine guide vane 11.

The working principle of the utility model is described as follows:

The cone valve 5 of the utility model is arranged on the branch pipe 4 before the water inlet main valve 3 of the water turbine 1 . There are three working states:

1. When the water turbine unit 2 is shut down, the governor 9 of the power station controls the adjusting device 7 of the cone valve 5 through the hydraulic pipeline 8 under electrical control to make the cone valve 5 work at the opening of the discharge ecological flow Q1.

2. When the water turbine unit 2 is running normally, the power station governor 9 controls the water turbine guide vane servomotor 10 to open the water turbine guide vane 11 through the hydraulic pipeline 8 under electrical control, and the unit operates normally. At the same time, the governor 9 of the power station operates the regulating device 7 through the hydraulic pipeline 8 under electrical control to make the cone valve 5 continue to discharge the ecological flow Q1.

3. When the load shedding pressure of the water turbine unit 2 rises to the set value, the governor 9 of the power station operates the cone valve 5 through the hydraulic pipeline 8 to increase the opening. At this time, the cone valve 5 discharges the ecological flow Q1 plus the power station The flow Q2 that needs to be released. The power station governor 9 operates the hydraulic turbine guide vane servomotor 10 to close the hydraulic turbine guide vane 11 through the hydraulic pipeline 8, thereby controlling the speed increase of the hydraulic turbine unit 2.

Claims (2)

1. A pressure regulating device of a hydropower station, including a water turbine unit (2) installed on the water intake main pipe (1), the water intake main valve (1) at the front end of the water turbine unit (2) is provided with a water inlet main valve (3), and the water inlet A branch pipe (4) is provided on the water intake main pipe (1) at the front end of the main valve (3). ), the outlet of the cone valve (5) is connected to the downstream river of the power station through the pipeline (6); the regulating device (7) of the cone valve (5) is connected to the governor (9) of the power station through the hydraulic pipeline (8) . 2. The hydropower station pressure regulating device according to claim 1, characterized in that: the power station governor (9) is connected to the hydraulic turbine guide vane servomotor (10) through the hydraulic pipeline (8), and the hydraulic turbine guide vane servomotor (10) is connected with the turbine guide vane (11).

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