A locking device for movable guide vanes of a hydro-generator and its control method

Abstract

This invention provides a locking device and control method for a movable guide vane of a hydro-generator. The device includes a movable guide vane, a main crank arm and a secondary crank arm mounted on the journal of the movable guide vane, and a shear pin between the main and secondary crank arms. A pin is mounted on the main crank arm and hinged to a connecting hole on the piston rod of a hydraulic cylinder. The cylinder body is mounted on the top cover of the hydro-generator and rotates using a shaft and bushing structure. Inlet and outlet liquid ports are respectively provided at both ends of the hydraulic cylinder, connected to inlet and outlet liquid pipelines. These pipelines are connected to a hydraulic system via valves, providing hydraulic power. This invention features a simple structure and control method, resulting in high reliability. Locking the guide vane requires only valve action, resulting in low power consumption. This invention avoids the problem of equipment damage caused by the guide vane losing control and colliding when the shear pin of the movable guide vane breaks.

Description

Technical Field

[0001] This invention relates to the field of hydro-generator technology, and more specifically, to a locking device for movable guide vanes of a hydro-generator and its control method. Background Technology

[0002] Movable guide vanes play a crucial role in water turbines. They guide and cut off water flow, regulating the flow rate through the turbine by changing their opening degree, thereby controlling the turbine's output power. The movable guide vanes are driven by a relay, which uses hydraulic force to rotate a control ring. The control ring is connected to all movable guide vanes via connecting rods / plates and crank arms, thus driving each guide vane to rotate and regulate flow. When there are large debris in the water flow, they may become stuck between two movable guide vanes. When the guide vanes move, the resistance of the stuck vane increases, and the shear pin between the main and auxiliary crank arms may break, disconnecting the guide vane from the control system. This causes the guide vane to lose control, and in some cases (such as when debris detaches), it may collide with adjacent guide vanes, causing damage. Although there is a friction device between the movable guide vane and the auxiliary crank arm, its force is insufficient to completely control the position of the guide vanes. Summary of the Invention

[0003] The purpose of this invention is to provide a locking device for movable guide vanes of a hydro-generator and its control method. This invention features a simple structure and control method, resulting in high reliability. Locking the guide vane requires only valve action, leading to low power consumption. This invention avoids the problem of equipment damage caused by the guide vane losing control and colliding when the shear pin of the movable guide vane breaks.

[0004] To achieve the above-mentioned technical features, the present invention aims to provide a locking device for a movable guide vane of a hydro-generator, comprising a movable guide vane, a main crank arm and a secondary crank arm mounted on the journal of the movable guide vane, and a shear pin provided between the main crank arm and the secondary crank arm.

[0005] The main crank arm is equipped with a pin shaft, which is hinged to the connecting hole on the piston rod of the hydraulic cylinder. The cylinder body of the hydraulic cylinder is installed on the top cover of the hydro-generator and a shaft and bushing structure is used to achieve a rotatable connection.

[0006] The hydraulic cylinder has inlet and outlet liquid ports at both ends, which are connected to inlet and outlet liquid pipelines. The inlet and outlet liquid pipelines are connected to the hydraulic system through valves.

[0007] The hydraulic cylinder is a double-acting hydraulic cylinder.

[0008] One movable guide vane of the entire hydro-generator corresponds to one hydraulic cylinder.

[0009] A control method for a locking device for movable guide vanes of a hydro-generator, wherein the control method is implemented using any one of the locking devices for movable guide vanes of a hydro-generator, comprising:

[0010] Under normal circumstances, the valves on the inlet and outlet liquid lines of each hydraulic cylinder are open. During the movement of the movable guide vane, the hydraulic cylinder follows the movement without locking the movable guide vane.

[0011] When the shear pin of a certain movable guide vane is sheared, the valves on the corresponding inlet and outlet liquid pipelines of the hydraulic cylinder connected to the main crank arm of that movable guide vane are closed by signal control. As a result, the piston rod of the hydraulic cylinder cannot move, thus locking the movable guide vane.

[0012] The present invention has the following beneficial effects:

[0013] 1. The present invention has a simple structure and a simple control method, thus achieving high reliability. It only requires valve action to lock the guide vane, resulting in low power consumption.

[0014] 2. This invention can avoid the problem of equipment damage caused by the guide vane losing control and colliding when the shear pin of the movable guide vane breaks. Attached Figure Description

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0017] In the diagram: 1. Movable guide vane; 2. Hydraulic cylinder; 3. Main crank arm; 4. Secondary crank arm; 5. Shear pin. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] Example 1:

[0020] This embodiment provides a locking device for the movable guide vane of a hydro-generator, including a movable guide vane 1. A main crank arm 3 and an auxiliary crank arm 4 are mounted on the journal of the movable guide vane 1, and a shear pin 5 is provided between the main crank arm 3 and the auxiliary crank arm 4. A pin is provided on the main crank arm 3 and is hinged to the connecting hole on the piston rod of the hydraulic cylinder 2. The cylinder body of the hydraulic cylinder 2 is mounted on the top cover of the hydro-generator and is rotatably connected using a shaft and bushing structure. Liquid inlet and outlet ports are respectively provided at both ends of the hydraulic cylinder 2, and the liquid inlet and outlet ports are connected to liquid inlet and outlet pipelines, which are respectively connected to the hydraulic system through valves. This invention has a simple structure and simple control method, resulting in high reliability. Locking the guide vane only requires valve action, and power consumption is low. In specific operation, when it is necessary to drive the movable guide vane 1, oil is supplied to the hydraulic cylinder 2 through the hydraulic system. The hydraulic cylinder 2 drives the corresponding main crank arm 3, which in turn drives the movable guide vane 1, thus achieving the opening and closing action of the movable guide vane 1.

[0021] Furthermore, the hydraulic cylinder 2 is a double-acting hydraulic cylinder. By using a double-acting hydraulic cylinder, bidirectional operation can be achieved, thereby adapting to the movement of the movable guide vane 1.

[0022] Furthermore, each of the multiple movable guide vanes 1 of the entire hydro-generator corresponds to a hydraulic cylinder 2. Through the aforementioned individual control method, the opening and closing action of a single movable guide vane 1 can be precisely achieved.

[0023] Example 2:

[0024] A control method for a locking device for movable guide vanes of a hydro-generator, wherein the control method is implemented using any one of the locking devices for movable guide vanes of a hydro-generator, comprising:

[0025] Under normal circumstances, the valves on the inlet and outlet liquid pipelines of each hydraulic cylinder 2 are open. During the movement of the movable guide vane 1, the hydraulic cylinder 2 follows the movement without locking the movable guide vane 1.

[0026] When the shear pin 5 of a certain movable guide vane 1 is sheared, the valves on the corresponding inlet and outlet liquid pipelines of the hydraulic cylinder 2 connected to the main crank arm 3 of the movable guide vane 1 are closed by signal control. Then the piston rod of the hydraulic cylinder 2 cannot move, thereby locking the movable guide vane 1.

[0027] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A control method for a locking device for a movable guide vane of a hydro-generator, the locking device comprising a movable guide vane (1), a main crank arm (3) and a secondary crank arm (4) mounted on the journal of the movable guide vane (1), and a shear pin (5) provided between the main crank arm (3) and the secondary crank arm (4). The main crank arm (3) is provided with a pin shaft, which is hinged to the connecting hole on the piston rod of the hydraulic cylinder (2). The cylinder body of the hydraulic cylinder (2) is installed on the top cover of the water turbine generator and a shaft and bushing structure is used to achieve a rotating connection. The hydraulic cylinder (2) has inlet and outlet liquid ports at both ends respectively. The inlet and outlet liquid ports are connected to the inlet and outlet liquid pipelines. The inlet and outlet liquid pipelines are connected to the hydraulic system through valves respectively. Its features are, The control method includes: Under normal circumstances, the valves on the inlet and outlet liquid pipelines of each hydraulic cylinder (2) are open. During the movement of the movable guide vane (1), the hydraulic cylinder (2) follows the movement without locking the movable guide vane (1). When the shear pin (5) of a certain movable guide vane (1) is sheared, the valves on the corresponding inlet and outlet liquid pipelines of the hydraulic cylinder (2) connected to the main crank arm (3) of the movable guide vane (1) are closed by signal control. Then the piston rod of the hydraulic cylinder (2) cannot move, thereby locking the movable guide vane (1).

2. The control method for a locking device for movable guide vanes of a hydro-generator according to claim 1, characterized in that: The hydraulic cylinder (2) is a double-acting hydraulic cylinder.

3. The control method for a locking device for movable guide vanes of a hydro-generator according to claim 1, characterized in that: One movable guide vane (1) of the entire hydro-generator corresponds to one hydraulic cylinder (2).

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