CN113279893A

CN113279893A - Hydroelectric set stator displacement sensor fixing device

Info

Publication number: CN113279893A
Application number: CN202110594976.6A
Authority: CN
Inventors: 朱恩禹; 郭金忠; 杜学云; 张启明; 王灿; 李庚�
Original assignee: Huaneng Lancang River Hydropower Co Ltd
Current assignee: Huaneng Lancang River Hydropower Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2021-08-20

Abstract

The invention provides a fixing device for a guide vane displacement sensor of a water turbine generator set, which comprises a fixed bedplate, a sliding block, a servomotor and a cantilever arm, wherein the fixed bedplate is provided with a sliding rail, the sliding block is matched with the sliding rail in a sliding way and provided with the displacement sensor, the servomotor is connected with a piston rod and used for controlling the opening and closing of the guide vane, and the cantilever arm is connected with the servomotor and the sliding block. The guide vane synchronous moving mechanism has the advantages that moving signals and data are transmitted to the controller to control the opening and closing of the guide vanes, the first universal ball head, the second universal ball head and the push-pull rod are connected rigidly to complete synchronous moving of the sliding block, various stress influences are eliminated, the structure is simple, the operation is reliable, the interference is less, and the service life is long.

Description

Hydroelectric set stator displacement sensor fixing device

Technical Field

The invention relates to a fixing device for a guide vane displacement sensor of a hydroelectric generating set, and belongs to the technical field of speed regulator control devices of hydroelectric generating sets.

Background

The speed regulator is an important component part for normal operation of the water-turbine generator set, and the opening of the movable guide vane is controlled by the speed regulator to realize start-stop and load adjustment of the water-turbine generator set. When the generator set runs, opening and closing degree signals and data of the movable guide vanes need to be collected by the displacement sensor and then fed back to the controller, so that the generator set is monitored in real time. In the prior art, a displacement sensor is fixed on a sliding block, the sliding block is matched with a sliding rail fixed on a bedplate in a sliding mode, the sliding block is connected with a servomotor (equivalent to a valve controlled by power) for controlling the opening and closing of guide vanes through a connecting rod, and when the servomotor moves, the connecting rod, the sliding block and the displacement sensor are driven to move synchronously, so that a movement signal or data is transmitted to a controller, and the opening and closing of movable guide vanes are controlled in real time through the controller. However, in actual work, the connecting rod and the sliding block are driven to move frequently when the generator set is started, stopped and load is adjusted frequently, meanwhile, the connecting rod rigidly connected with the sliding block and the servomotor is stressed and deformed due to the vibration and swing of the generator set, even the connecting rod is broken due to over fatigue, the signal and data collected by the displacement sensor are misaligned, the phenomenon of repeated adjustment of the speed regulator occurs, the displacement sensor loses control in severe cases, the moving signal and data cannot be collected, active power abnormal fluctuation is caused, the generator set runs in reverse power, even the generator set is stopped due to accidents, and the safe and stable operation of the water-turbine generator set is seriously influenced. There is therefore a need for improvements in the prior art.

Disclosure of Invention

In order to solve the problems that a slide block provided with a displacement sensor and a connecting rod of a servomotor are stressed and deformed and are subjected to fatigue fracture to cause the faults of the displacement sensor and the like due to frequent starting, stopping and load adjustment of a unit in the prior art, the invention provides a guide vane displacement sensor fixing device of a water-turbine generator set, which is used for eliminating the influences of frequent starting, stopping and load adjustment and vibration and swing of the generator set on the displacement sensor, ensuring accurate signal or data acquisition of the displacement sensor and ensuring safe and stable operation of the water-turbine generator set.

The invention is completed by the following technical scheme: a fixing device for guide vane displacement sensor of water turbine generator set is composed of a fixed bench with slide track, a slide block with displacement sensor and matched with said slide track, a servomotor connected to piston rod for controlling the guide vane to be opened or closed, and an extending arm for connecting said servomotor with slide block When the extending arm moves synchronously, stress in all directions generated by frequent opening and closing of the guide vane and stress influence generated by vibration and swing of the generator set are eliminated through the first universal ball head and the second universal ball head, so that accurate signal or data acquisition of the displacement sensor is ensured, and safe and stable operation of the water-turbine generator set is further ensured.

And the displacement sensor is in signal connection with the controller.

The slide blocks are provided with a plurality of blocks, each slide block is provided with at least one displacement sensor and a first universal ball head, and the slide rails are correspondingly arranged and used for collecting different displacement signals or data.

And the second universal ball head is fixed on one side of the through groove at the outer end of the extension arm.

The invention has the following advantages and effects: by adopting the technical scheme, when the servomotor moves, the extending arm drives the sliding block and the displacement sensor on the sliding block to move along the sliding rail, so that moving signals or data are transmitted to the controller, the opening and closing of the guide vane are controlled, and meanwhile, through the arrangement of the first universal ball head, the second universal ball head and the push-pull rod, the influence of stress in each direction generated in the opening and closing processes of the guide vane and stress generated by vibration and swing of the generator set is eliminated while the sliding block is ensured to move synchronously through rigid connection, so that the accurate acquisition of signals or data of the displacement sensor is ensured.

Drawings

FIG. 1 is a top view of the present invention;

fig. 2 is a view a-a of fig. 1.

The invention is further described below with reference to the accompanying drawings.

The invention provides a fixing device for guide vane displacement sensors of a water turbine generator set, which comprises a fixed bedplate 5 provided with slide rails 6, wherein the fixed bedplate 5 is fixed on the inner wall 9 of a machine pit through a bracket 8, the three slide rails 6 are respectively matched with slide blocks 7 provided with displacement sensors in a sliding way, the displacement sensors are all in signal connection with a controller, the fixing device also comprises a servomotor 1 connected with a piston rod 2 and used for pushing and pulling guide vanes to move so as to realize the opening and closing of the guide vanes, and an extending arm 12 connected with the servomotor 1 and the slide blocks 7, wherein: the three sliding blocks 7 are all arranged in the through grooves 11 corresponding to the outer ends of the extension arms 12, the inner ends of the extension arms 12 are fixed on the servomotor 1, the three sliding blocks 7 are all provided with first universal ball heads 4, the first universal ball heads 4 are connected with second universal ball heads 10 corresponding to the outer ends of the extension arms 12 through push-pull rods 3, and the second universal ball heads 10 are fixed on the inner sides of the through grooves 11 corresponding to the outer ends of the extension arms 12.

When the servomotor 1 and the cantilever arm 12 move along with the piston rod 2, the three sliders 7 and the displacement sensors on the three sliders 7 are driven to move along the slide rails 6 by buckling the through grooves 11 of the cantilever arm 12 and the three sliders 7, so that moving signals or data are transmitted to the controller, the opening and closing of the guide vanes are controlled by the controller, and meanwhile, through the arrangement of the corresponding first universal ball heads 4 and the second universal ball heads 10 and the push-pull rod 3, while the three sliders 7 are ensured to move synchronously along with the servomotor 1 and the cantilever arm 12 after rigid connection is completed, the stress in each direction generated by frequent opening and closing of the guide vanes and the stress influence generated by vibration and swing of the generator set are eliminated through the first universal ball heads 4 and the second universal ball heads 10, so that the displacement sensors on the sliders 7 can accurately send out the displacement signals or data, and the safe and stable operation of the.

Claims

1. A fixing device for a guide vane displacement sensor of a water turbine generator set comprises a fixing bedplate, a sliding block, a servomotor and a cantilever arm, wherein the fixing bedplate is provided with a sliding rail, the sliding block is matched with the sliding rail in a sliding mode and provided with the displacement sensor, the servomotor is connected with a piston rod and used for controlling opening and closing of the guide vane, and the cantilever arm is connected with the servomotor and the sliding block.

2. The hydroelectric generating set guide vane displacement sensor fixing device as claimed in claim 1, wherein the displacement sensor is in signal connection with a controller.

3. The fixing device for the guide vane displacement sensor of the water turbine generator set according to claim 1, wherein a plurality of sliding blocks are arranged, each sliding block is provided with at least one displacement sensor and a first universal ball head, and a plurality of corresponding sliding rails are arranged.

4. The fixing device for the guide vane displacement sensor of the water turbine generator set according to claim 1, wherein the second universal ball head is fixed on one side of the through groove at the outer end of the extension arm.