Hydropower station water inlet decontamination hole protection device and method

Abstract

The invention discloses a hydropower station water inlet decontamination hole protection device and method, and relates to the technical field of hydropower station equipment, the device comprises a hydraulic pump station, a plurality of units arranged in parallel, a protection cover plate and a control box; each unit is connected with a hydraulic pump station through a hydraulic pipeline, and the hydraulic pump station is connected with a control box in a wireless communication mode. And the control box controls the protective cover plate to stretch out and draw back to the corresponding position of the decontamination hole for protection. The method executes corresponding actions based on the device. According to the device and method, the protection cover plate is controlled by the control box to stretch out and draw back to the corresponding position of the dirt cleaning hole for protection, electromagnetic control logic is adopted in the process, the manual protection and cleaning efficiency is greatly improved, and meanwhile the risk of high-altitude falling is reduced to a certain degree.

Description

Technical Field

[0001] The present invention relates to the technical field of hydropower station equipment, and in particular to a protective device and method for a sewage cleaning hole of a water inlet of a hydropower station. Background Art

[0002] A hydropower station is a power generation facility that converts the kinetic or potential energy of water into electrical energy. It is an important form of renewable energy generation. Its core principle is to create a water level difference (head) by building a dam to store water (or directly diverting water). The water flow drives the turbine to rotate, driving the generator to generate electricity, ultimately converting mechanical energy into electrical energy. Among them, hydropower stations can be divided into large (installed capacity ≥300MW (such as the 22,500MW Three Gorges Dam)), medium (50MW-300MW (such as the 3,300MW Ertan Dam)), and small (≤50MW (commonly found on tributaries in mountainous areas)). Furthermore, small and medium-sized hydropower stations are often considered to be mountain water stations, which usually refer specifically to those built on mountain rivers or terrain, while hydropower station is a general term for them.

[0003] Due to the geographical location and other conditions, some mountain hydropower stations currently face a high degree of safety risks when cleaning the debris blockage at their cleaning holes, and manual cleaning efficiency is low. Therefore, in order to reduce the risk of falling from heights in mountain hydropower stations, it is necessary to modify the safety protection measures of their water inlet cleaning holes and design a protective structure and method that can improve cleaning efficiency and operational safety. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a device and method for protecting a sewage cleaning hole at a water inlet of a hydropower station.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A protective device for a sewage cleaning hole at a water inlet of a hydropower station comprises a hydraulic pump station, a plurality of units arranged in parallel, a protective cover plate, and a control box; each unit is connected to the hydraulic pump station via a hydraulic pipeline, and the hydraulic pump station and the control box are connected via wireless communication; and the control box controls the protective cover plate to extend and retract to the corresponding position of the sewage cleaning hole for protection.

[0007] Based on the above technical solution, further, the hydraulic pipeline includes a return oil pipe and a pressure oil pipe, and the return oil pipe and the pressure oil pipe are both connected to a ball valve, a solenoid valve and a travel switch SQ.

[0008] Based on the above technical solution, further, the protective cover plate and the hydraulic pipeline, and multiple units share the pressure oil pipe and the return oil pipe.

[0009] Based on the above technical solution, further, a door garage is provided on one side of the hydraulic pump station, and the working pressure of the hydraulic pump station is set to 18-22 MPa.

[0010] Based on the above technical solution, further, the protective cover plate is arranged on the cement beam on the upstream side of the cleaning hole, wherein each cleaning hole is correspondingly provided with a protective cover plate.

[0011] Based on the above technical solution, further, a hydraulic rod is installed at one end of the protective cover plate, and the other end of the hydraulic rod is fixed to the cement beam through a support seat.

[0012] Based on the above technical solution, further, the oil circuit of the hydraulic rod is connected to the corresponding solenoid valve, and the telescopic action of the hydraulic rod is controlled by the solenoid valve, thereby driving the telescopic action of the corresponding protective cover.

[0013] Based on the above technical solution, further, the control box is connected to each solenoid valve for communication; the control logic is: when the control box outputs a low-power logic signal; the switch set in the control box amplifies the current to the working current required by the solenoid valve; after power is turned on, a magnetic field is generated to drive the valve core of the solenoid valve to move, thereby realizing communication action.

[0014] Based on the above technical solution, further, the process of controlling the action of the protective cover is: first, the control box sends a corresponding pulse signal to the coil of the solenoid valve to perform a signal input action; then the coil is energized to generate a magnetic field, driving the switch to move the valve core to perform electromagnetic conversion; then the oil channel is changed by the displacement of the valve core, and the high-pressure oil is guided into the chamber corresponding to the hydraulic rod to realize oil circuit switching; finally, the hydraulic rod is pushed to move linearly by the oil pressure to complete the load drive and drive the protective cover to move.

[0015] A method for protecting a sewage cleaning hole at a water inlet of a hydropower station comprises the following steps: starting a control box and a hydraulic pump station; and controlling a hydraulic rod through the control box to drive a protective cover plate to extend and retract to a corresponding position of the sewage cleaning hole for protection.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The device and method provided by the present invention control the protective cover to extend and retract to the corresponding position of the cleaning hole for protection through a control box. Electromagnetic control logic is used in the process, which greatly improves the efficiency of manual protection and cleaning, and reduces the risk of falling from height to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the layout structure of the protective device of the present invention;

[0019] Figure numerals: 1. Door garage; 2. Door machine track; 3. Sewage cleaning machine track; 4. Return oil pipe; 5. Pressure oil pipe; 6. Ball valve; 7. Solenoid valve; 8. Travel switch SQ; 9. Hydraulic pump station. DETAILED DESCRIPTION

[0020] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention may be combined accordingly, provided that there is no conflict between them.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. The technical features in the various embodiments of the present invention can be combined accordingly without conflicting with each other.

[0022] In the description of the present invention, it should be understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element or indirectly connected, that is, there are intermediate elements. On the contrary, when an element is said to be "directly" connected to another element, there are no intermediate elements.

[0023] Example

[0024] This device is based on the Xiushan Hydropower Station. It is located downstream of the Zishui River in a certain county, 16 km from the county seat and 44 km from Yiyang City. The Xiushan Hydropower Station is a low-head riverbed power station equipped with five 13MW bulb-type tubular turbine units, totaling 65MW. The total investment is approximately 687 million yuan, with a designed annual power generation of 276 million kW·h. The first unit was connected to the grid on August 28, 2006, and all five units were connected on July 11, 2007. Each unit's intake trash rack is equipped with a trash cleaning hole to facilitate the removal of floating debris and other objects. Each hole is approximately 13.4 meters long and 2.2 meters wide, and the total length of the five units' intake trash cleaning holes is approximately 83 meters.

[0025] This embodiment provides a method for protecting a sewage cleaning hole at a water inlet of a hydropower station, which includes the following steps:

[0026] Start the control box and the hydraulic pump station 9; wherein, the hydraulic pump station 9 provides a pressure-adjustable oil source for the entire protection system, which supports adaptive flow distribution; and controls the hydraulic rod through the control box to drive the protective cover to extend and retract to the corresponding position of the cleaning hole to achieve safety protection.

[0027] Specifically, in the control box control process, the monitoring process includes:

[0028] (1) Monitoring the electromagnetic valve 7:

[0029] In this embodiment, the electromagnetic valve 7 is preferably a proportional electromagnetic valve 7, which controls the speed of the hydraulic rod by adjusting the flow and direction of the hydraulic oil in the pipeline, wherein the speed range of the hydraulic rod is preferably adjustable 0.01-0.5m / s; It should be noted that the extension distance of the hydraulic rod is set according to the actual situation, which is not limited here;

[0030] (2) Monitoring the ball valve 6:

[0031] In this embodiment, the ball valve 6 is preferably an electric ball valve 6, which is used to manage the hydraulic system cooling oil circuit to prevent overheating, and preferably can automatically increase the flow to reduce the temperature when the temperature exceeds the set threshold temperature;

[0032] Wherein, in the monitoring process, in view of the existence of ball valve 6 jamming, the design of the troubleshooting idea:

[0033] The torque curve of the temperature in the monitoring process can be checked by using a power quality analyzer and other monitoring equipment. If it is over limit, there is a large degree of risk of jamming, so manual checking method can be used for checking;

[0034] (3) Monitoring the travel switch:

[0035] In this embodiment, the travel switch SQ8 is used to monitor the opening and closing angle of the protective cover plate. If the opening and closing angle condition does not meet the requirements, the monitoring result is transmitted to the control box, and the relevant operator is reminded by the control box to check. Preferably, the opening and closing angle range condition is set to 0°-10°.

[0036] It should be noted that at least the following matters need to be paid attention to during construction and reconstruction:

[0037] 1. In the construction process, the anti-falling measures should be done in advance, and the safety belt should be tied during the edge operation.

[0038] 2. The inlet hole of the unit under construction is isolated by the protective fence to prevent the construction personnel from falling into the water.

[0039] 3. Good prevention of mechanical injury and anti-electric shock accident.

[0040] In other embodiments, in combination with Figure 1As shown, based on the protection method, this embodiment provides a protective device for the sewage cleaning hole at the water inlet of a hydropower station, which includes a hydraulic pump station 9, a plurality of units arranged in parallel, a protective cover and a control box; each unit is connected to the hydraulic pump station 9 through a hydraulic pipeline, and the hydraulic pump station 9 is connected to the control box by wireless communication (remote operation and maintenance interface, etc.), and the protective cover is controlled by the control box to extend and retract to the corresponding position of the sewage cleaning hole for protection; wherein, the hydraulic pipeline includes at least a return oil pipe 4 and a pressure oil pipe 5, and the return oil pipe 4 and the pressure oil pipe 5 are both connected to a ball valve 6, a solenoid valve 7 and a travel switch SQ8; further, due to the limitation of the distance between the upstream side of the sewage cleaning hole and the retaining wall, the protective cover controls the laying of the hydraulic pipeline to select a plurality of units to share the pressure oil pipe 5 and the return oil pipe 4; wherein, the pressure oil pipe 5 is preferably a pressure oil pipe 5 with a diameter of 25 mm, and the return oil pipe 4 is preferably a return oil pipe 4 with a diameter of 20 mm.

[0041] In this embodiment, the hydraulic pump station 9 is arranged on one side of the door garage 1, and its working pressure is set to 18-22 MPa, preferably 20 MPa.

[0042] In this embodiment, the protective cover is manufactured from materials such as I-beams, channel steel, and grids according to the size of each unit's cleaning hole, and its strength meets national safety standards. Specifically, the protective cover is installed on the cement beam on the upstream side of the cleaning hole, wherein each cleaning hole corresponds to a corresponding protective cover. Furthermore, a hydraulic rod is installed at one end of the protective cover. The length of the hydraulic rod is preferably 1.5m and the diameter is preferably 100cm. The other end of the hydraulic rod is fixed to the cement beam via a support bracket, and the oil circuit of the hydraulic rod is connected to the corresponding solenoid valve 7. The solenoid valve 7 can control the extension and retraction of the hydraulic rod, thereby driving the extension and retraction of the corresponding protective cover.

[0043] In this embodiment, the control box is connected to each solenoid valve 7 by wired or wireless communication, and its control logic is: when the control box outputs a low-power logic signal (such as the 24VDC output of the PLC); the switch set in the control box amplifies the current to the working current required by the solenoid valve 7 (usually 0.5-2A), wherein the switch can select an electromagnetic relay or a solid-state switch; after power is turned on, a magnetic field is generated to drive the valve core displacement of the solenoid valve 7 (response time ≤20ms).

[0044] In this embodiment, the logic of the control box controlling the ball valve 6, the solenoid valve 7 and the travel switch SQ8 is:

[0045] The control box (PLC / DCS system) serves as the core controller (control center) and generates two types of output signals based on preset logic or algorithms: digital signals (switching commands) drive electromagnetic relays / solid-state switches, and analog signals (continuous regulation) control intelligent actuators.

[0046] Furthermore, the execution layer actions are:

[0047] (1) Solenoid valve 7 control: The electromagnetic relay or solid-state switch amplifies the digital signal and switches the power supply of the solenoid valve 7 coil on and off to achieve rapid opening and closing (response time < 100ms).

[0048] (2) Ball valve 6 adjustment: The intelligent actuator receives the analog signal that meets the conditions and can accurately adjust the opening of the ball valve 6 (for example, the accuracy is set to ±0.5%).

[0049] (3) Closed-loop feedback: The travel switch SQ8 detects the opening, closing, and extension of the protective cover in real time and feeds the limit signal back to the control box, forming a closed-loop control. If the limit is triggered (such as the valve is fully open), the control signal is immediately interrupted to ensure safety.

[0050] Specifically, the principle of controlling the action of the protective cover is:

[0051] First, the control box sends a corresponding pulse signal to the coil of the solenoid valve 7 to realize signal input; then the coil is energized to generate a magnetic field, driving the armature (the core moving component of the electromagnetic relay) to drive the valve core to move, realizing electromagnetic conversion, wherein the displacement is set according to actual conditions; then the oil channel is changed by the displacement of the valve core, guiding the high-pressure oil into the chamber corresponding to the hydraulic rod, realizing oil circuit switching; furthermore, the hydraulic rod is pushed into linear motion by the oil pressure to complete the load drive, that is, to drive the protective cover to move.

[0052] In some other embodiments, a door machine track 2 and a garbage cleaning machine track 3 are respectively provided on both sides of each unit. It should be noted that the protective cover does not affect the normal operation of the maintenance door machine and the garbage cleaning machine when it is opened or closed.

[0053] It should be noted that the installation technical requirements are:

[0054] 1. The protective cover of a single cleaning hole at the water inlet can be closed and opened on-site or remotely with one button.

[0055] 2. After opening, it must not hinder the normal passage and operation of the sewage cleaning machine and the water inlet bridge crane.

[0056] 3. The hydraulic cover should bear a minimum load of 1t when closed.

[0057] 4. The gap between the protective cover and the concrete shall not exceed 5cm.

[0058] 5. The installation pipelines and equipment must not hinder the movement of the water inlet door crane and the sewage cleaning machine, as well as the lifting of the inspection door.

[0059] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A protective device for a sewage cleaning hole at a water inlet of a hydropower station, characterized in that: It includes a hydraulic pump station, multiple units arranged in parallel, protective covers and a control box; Each unit is connected to the hydraulic pump station through hydraulic pipelines, and the hydraulic pump station is connected to the control box through wireless communication; The protective cover is controlled by the control box to be extended and retracted to the corresponding position of the cleaning hole for protection.

2. A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to claim 1, characterized in that: The hydraulic pipeline includes a return oil pipe and a pressure oil pipe, and both the return oil pipe and the pressure oil pipe are connected to a ball valve, a solenoid valve and a travel switch SQ.

3. A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to claim 2, characterized in that: The protective cover plate and the hydraulic pipeline, and multiple units share the pressure oil pipe and the return oil pipe.

4. A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to claim 1, characterized in that: A door garage is provided on one side of the hydraulic pump station, and the working pressure of the hydraulic pump station is set to 18-22 MPa.

5. A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to claim 2, characterized in that: The protective cover plate is arranged on the cement beam on the upstream side of the cleaning hole, wherein each cleaning hole is correspondingly provided with a protective cover plate.

6. A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to claim 5, characterized in that: A hydraulic rod is installed at one end of the protective cover plate, and the other end of the hydraulic rod is fixed on the cement beam through a support seat.

7. A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to claim 6, characterized in that: The oil circuit of the hydraulic rod is connected to the corresponding solenoid valve, and the extension and retraction of the hydraulic rod is controlled by the solenoid valve, thereby driving the extension and retraction of the protective cover.

8. A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to claim 7, characterized in that: The control box is connected to each solenoid valve for communication; the control logic is: when the control box outputs a low-power logic signal; the switch set in the control box amplifies the current to the working current required by the solenoid valve; after power is turned on, a magnetic field is generated to drive the valve core of the solenoid valve to move, thereby realizing communication.

9. A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to claim 8, characterized in that: The process of controlling the action of the protective cover is as follows: first, the control box sends a corresponding pulse signal to the coil of the solenoid valve to perform signal input action; then the coil is energized to generate a magnetic field, driving the switch to move the valve core for electromagnetic conversion; then the oil channel is changed by the displacement of the valve core, guiding the high-pressure oil into the chamber corresponding to the hydraulic rod to realize oil circuit switching; finally, the hydraulic rod is pushed into linear motion by the oil pressure to complete the load drive and drive the protective cover to move.

10. A method for protecting the sewage cleaning hole of the water inlet of a hydropower station, characterized in that: A protective device for a sewage cleaning hole at a water inlet of a hydropower station according to any one of claims 1 to 9 is used, and the steps are: starting a control box and a hydraulic pump station; and controlling the hydraulic rod through the control box to drive the protective cover plate to extend and retract to the corresponding position of the sewage cleaning hole for protection.

Images