Hydropower station guide vane sensor position indicating device

Abstract

The utility model discloses a hydropower station guide vane sensor position indicating device which comprises a sensor installation body installed on a guide vane, a sliding block for sliding acquisition is arranged at the range acquisition end of the sensor installation body, and the top of the sliding block is fixedly connected with a servomotor through a connecting rod. A plurality of microswitches are arranged at two ends of the sensor mounting body, and a plurality of proximity sensors are respectively arranged at limiting distance positions of reciprocating sliding of the sliding block; the guide vane sensor positioning device has the advantages of being easy to install and capable of saving labor cost, positioning and position monitoring are carried out on the guide vane sensor through the positioning device, working efficiency is improved, and the guide vane sensor positioning device further has the advantages of being accurate in positioning, capable of giving an alarm automatically, easy to install and convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic control of hydropower stations, and particularly refers to a position indicating device for a guide vane sensor of a hydropower station. Background Art

[0002] The existing guide vane sensor of the water turbine governor is installed on its sensor fixing bracket, but there is no corresponding indication or marking for the overall installation position of the sensor on the bracket. At present, only a marker pen can be used to manually draw lines at the head and tail ends of the sensor. As a result, after adjusting the installation position of the sensor and calibrating the guide vane stroke during each maintenance period, it is necessary to manually draw lines at the head and tail ends of the sensor again. The maintenance workload is large, the efficiency is low, and each time the installation position of the sensor is checked, it is only possible to enter the waterwheel chamber for on-site observation, and there is no remote monitoring and corresponding signal indication function. Content of the Utility Model

[0003] The main technical problem solved by the present invention is to design a positioning device for the guide vane sensor of a hydropower station governor to position and monitor the installed and fixed guide vane sensor, and send the corresponding alarm signal to the governor control cabinet and the monitoring system, so as to improve the safety and accuracy of the governor during the process of opening and closing the guide vane.

[0004] To solve the above technical problem, the utility model adopts the following technical solution: a position indicating device for a guide vane sensor of a hydropower station, including a sensor installation body installed on the guide vane. A sliding slider is arranged at the range acquisition end of the sensor installation body. The top of the slider is fixedly connected to the servomotor through a connecting rod. A plurality of microswitches are arranged at both ends of the sensor installation body, and a plurality of proximity sensors are respectively arranged at the limit distance positions where the slider reciprocates.

[0005] Preferably, the plurality of microswitches are fixed in pairs at both ends of the sensor installation body.

[0006] Preferably, a scale is detachably connected to the top of the range acquisition end of the sensor installation body. A chute is arranged between the bottom of the scale and the top of the sensor installation body, and the slider reciprocates along the sensor installation body through the chute.

[0007] Preferably, the length of the scale is greater than the length of the range acquisition end of the sensor installation body, and the slider is restricted to reciprocate only on the range acquisition end of the sensor installation body by the servomotor.

[0008] Preferably, both ends of the scale are respectively a dead zone for the measured value of the fully opened guide vane and a dead zone for the measured value of the fully closed guide vane, and proximity sensors are arranged at the positions of the fully opened measured value dead zone and the fully closed measured value dead zone of the guide vane.

[0009] Preferably, the slider is made of non-metallic material, and the scale is made of metal material and is detachably installed on the top of the sensor installation body.

[0010] Advantages of the present utility model:

[0011] The present utility model has the beneficial effects of simple installation and labor cost saving. By using the positioning device to position and monitor the position of the guide vane sensor, the working efficiency is improved. The present utility model also has the beneficial effects of accurate positioning, automatic alarm, simple installation and easy maintenance. Description of the drawings

[0012] Figure 1 is a schematic structural view of the present utility model;

[0013] Figure 2 is a top view of the present utility model;

[0014] 1. Guide vane sensor body; 2. Proximity sensor; 3. Connecting rod; 4. Slider; 5. Scale; 6. Microswitch; 11. The fully open measured value dead zone; 12. The fully closed measured value dead zone. Detailed implementation manners

[0015] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.

[0016] As Figure 1 Figure 2 shown, a position indicating device for a guide vane sensor of a hydropower station includes a sensor installation body 1 installed on the guide vane. A slider 4 for sliding collection is arranged on the range collection end of the sensor installation body 1. The top of the slider 4 is fixedly connected to the servomotor through a connecting rod 3. A plurality of microswitches 6 are arranged at both ends of the sensor installation body 1. A plurality of proximity sensors 2 are respectively arranged at the limit distance positions where the slider 4 reciprocally slides. In this embodiment, by arranging microswitches 6 at both ends of the sensor installation body 1, the sensor installation body 1 can trigger an alarm to report an abnormality when it is moved by external force interference. When the movement of the slider 4 exceeds the limit value, an alarm is triggered through the proximity sensor 2 to detect an abnormality.

[0017] Preferably, the plurality of microswitches 6 are fixed in pairs at both ends of the sensor installation body 1. In this embodiment, it is preferably to set the microswitches in pairs on the left and right sides of the sensor installation body 1 respectively, and they can also be fixed around the sensor installation body 1.

[0018] Preferably, a scale 5 is detachably connected to the top of the range acquisition end of the sensor installation body 1. A sliding groove is provided between the bottom of the scale 5 and the top of the sensor installation body 1. The slider 4 reciprocates along the sensor installation body 1 through the sliding groove. In this embodiment, the main purpose of the scale 5 installed on the sensor installation body 1 is to indicate the position of the slider 4, facilitating the recording of the readings of the fully open and fully closed positions of the guide vane on the scale during the positioning check of the guide vane stroke. This measured value is compared and analyzed with the data of the previous annual overhaul during each overhaul. In the traditional method, the slider 4 is directly sleeved on the outer periphery of the sensor installation body 1, and the sensor installation body 1 outputs a current value by sliding the slider 4. In this embodiment, because a scale 5 for facilitating the recording and comparison of data is provided on the top of the sensor installation body 1, the slider 4 is arranged on the scale 5. Through the sliding groove provided between the bottom of the scale 5 and the top of the sensor installation body 1, the slider 4 moves along the sliding groove. When the slider 4 slides, the range acquisition end on the top of the bottom of the slider 4 and the sensor installation body 1 contacts to output a current value to achieve the purpose of transmitting signals.

[0019] Preferably, the length of the scale 5 is greater than the length of the range acquisition end of the sensor installation body 1. The slider 4 reciprocates only on the range acquisition end of the sensor installation body 1 under the restriction of the servomotor. The length of the scale 5 needs to be greater than the length of the range acquisition end of the sensor installation body 1. During normal operation of the equipment, the fully open and fully closed positions of the servomotor are set by the mechanical part. Therefore, the slider 4 will not slide beyond the predetermined range to an area outside the scale 5. However, when an accident occurs, such as the breakage of the servomotor or the disconnection of the slider 4 resulting in sliding beyond the range, due to the sliding groove, the slider 4 first slides towards both ends, and the proximity sensor 2 receives the abnormality and then issues an alarm.

[0020] Preferably, the two ends of the scale 5 are respectively a fully open measured value dead zone 11 of the guide vane and a fully closed measured value dead zone 12 of the guide vane. Proximity sensors 2 are arranged at the positions of the fully open measured value dead zone 11 and the fully closed measured value dead zone 12 of the guide vane. In this embodiment, due to the range acquisition limitation on the sensor installation body 1, the two ends of its range acquisition limitation are respectively defined as the fully open measured value dead zone 11 of the guide vane and the fully closed measured value dead zone 12 of the guide vane; the slider 4 will not reach this area during range acquisition. Only when the slider 4 fails, will it slide beyond the acquisition range to this area. Therefore, a proximity sensor 2 is installed on each side of the fully open measured value dead zone 11 point of the guide vane on the guide vane sensor, and a proximity sensor 2 is installed on each side of the fully closed measured value dead zone 12 point of the sensor installation body 1. When an abnormality occurs during the slider 4 acquiring range data, the proximity sensor 2 detects that the slider 4 is approaching and sends an alarm signal to the governor control cabinet and the monitoring system.

[0021] Preferably, the slider 4 is made of non-metallic material, and the scale 5 is made of metal and is detachably mounted on the top of the sensor mounting body 1. In this embodiment, a detachable metal rigid scale 5 parallel to the sensor is mounted on the top of the sensor mounting body 1, and its range is greater than the range of the range acquisition end. If there are multiple sensors, the number of scales can be increased according to the actual situation. Since the scale 5 is a metal object when the slider 4 has not reached this position, approaching the proximity sensor 2 will generate a held high-level signal. When the slider 4 reaches this position, the slider 4 is a non-metallic object, and approaching the proximity sensor 2 will generate a low-level signal, and an alarm will occur in sequence.

[0022] The operation steps of this embodiment are as follows: When in use, the sensor mounting body 1 is mounted on the relevant bracket of the water turbine unit and fixed by bolts or other means. At this time, the position of the microswitch 6 is fixed. When in use, the slider 4 and the connecting rod 3 mounted on the sensor mounting body 1 are connected to the servomotor. Since the fully open and fully closed positions of the servomotor are determined by the mechanical structure part, the slider 4 will slide back and forth on the sensor mounting body 1 during the movement of the guide vane. Different positions of the slider 4 will cause the sensor to output different current values, which will be converted to display different guide vane opening values. Therefore, under normal circumstances, the movement of the slider 4 will not exceed the range of the sensor mounting body 1. Specifically, during observation, when the sensor mounting body 1 moves due to certain reasons (such as loose fixing screws, unit vibration, etc.) on the bracket, when the guide vane sensor body 1 comes into contact with the microswitch 6, the internal position contacts of the microswitch 6 close, and the signal of the internal position contacts of the microswitch 6 is sent to the monitoring system through a signal cable for fault alarm. Similarly, when the reciprocating movement of the slider 4 is abnormal, for example, exceeding the original sliding range and sliding to a position close to the proximity sensor 2 on the guide groove, the proximity sensor 2 sends a signal for fault alarm. If one of the two proximity sensors 2 at the same horizontal position senses the slider, a fault signal will be reported and a voice alarm will be given.

[0023] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The embodiments and features in the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A position indicating device for a guide vane sensor of a hydropower station, comprising a sensor mounting body (1) mounted on the guide vane, a slider (4) for sliding collection is arranged at the range collection end of the sensor mounting body (1), and the top of the slider (4) is fixedly connected to the servomotor through a connecting rod (3), characterized in that, A number of microswitches (6) are provided at both ends of the sensor mounting body (1), and a number of proximity sensors (2) are respectively provided at the limit distance positions where the slider (4) reciprocally slides.

2. The position indicating device for the guide vane sensor of a hydropower station according to claim 1, characterized in that, The aforenamed microswitches (6) are fixed in pairs at both ends of the sensor mounting body (1).

3. The position indicating device for the guide vane sensor of a hydropower station according to claim 1, characterized in that, A scale (5) is detachably connected to the top of the range acquisition end of the sensor mounting body (1). A chute is provided between the bottom of the scale (5) and the top of the sensor mounting body (1). The slider (4) reciprocates along the sensor mounting body (1) through the chute.

4. A position indicating device for a guide vane sensor of a hydropower station according to claim 3, characterized in that, The length of the scale (5) is greater than the length of the range acquisition end of the sensor mounting body (1). The slider (4) is restricted by a servomotor to reciprocate only on the range acquisition end of the sensor mounting body (1).

5. The position indicating device for a guide vane sensor of a hydropower station according to claim 4, wherein, Both ends of the scale (5) are respectively a fully open guide vane measurement dead zone (11) and a fully closed guide vane measurement dead zone (12). Proximity sensors (2) are provided at the positions of the fully open measurement dead zone (11) and the fully closed guide vane measurement dead zone (12).

6. The position indicating device for a guide vane sensor of a hydropower station according to claim 5, wherein The slider (4) is made of a non-metallic material. The scale (5) is made of a metallic material and is detachably mounted on the top of the sensor mounting body (1).

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