Mechanical vane master controller

Abstract

This invention discloses a mechanical guide vane master controller, which utilizes a movable wedge-shaped trigger rod to trigger left and right limit switches at the same position, causing each limit switch to output a switching signal. The wedge-shaped trigger rod also moves a travel trigger plate, and magnetic probes at both ends of the travel trigger plate cooperate with corresponding travel sensors to trigger left and right travel sensors to output analog signals. This invention is used for monitoring the travel signals of turbine guide vanes, and can output redundant switching and analog signals, unaffected by weather, location, time, or unit operating conditions, thus offering higher reliability.

Description

Technical Field

[0001] This utility model relates to a turbine condition diagnosis device, specifically a mechanical guide vane master controller. Background Technology

[0002] The function of the guide vane master controller is to provide guide vane position signals, which directly reflect the current guide vane opening. Guide vane position signals are divided into two types: digital and analog. Digital signals are generally used for fault early warning and process control, while analog signals are used for fault early warning, signal monitoring, etc.

[0003] Existing guide vane master controllers are divided into two categories: mechanical and electrical.

[0004] Mechanical guide vane master controllers can output digital signals at different positions via corresponding limit switches. Although existing mechanical guide vane master controllers have a simple structure, they can only output digital signals and not analog signals. Furthermore, they can only output one digital signal at a single position. If there is a need for multiple access points, an additional electrical expansion circuit needs to be designed to expand one digital signal into multiple signals, which reduces reliability.

[0005] The electric guide vane master controller sends analog signals from the relay to a programmable master controller, which then outputs switching signals via a computer program. While the electric guide vane master controller is simpler to install and configure, it relies on a power supply, is susceptible to electromagnetic interference, and has poor reliability.

[0006] Currently, most hydropower stations in China use mechanical guide vane master controllers. Utility Model Content

[0007] Purpose of the utility model: The purpose of this utility model is to provide a highly reliable mechanical guide vane master controller.

[0008] Technical Solution: This utility model discloses a mechanical guide vane master controller, comprising a master control base plate and a wedge-shaped trigger rod. A left travel sensor and a right travel sensor are mounted parallel to each other on the master control base plate, and multiple pairs of travel switches are spaced apart between the left and right travel sensors along a direction parallel to the travel sensors. Each pair of travel switches includes a left travel switch and a right travel switch arranged opposite each other. The wedge-shaped trigger rod moves through the channel formed between the multiple pairs of left and right travel switches, triggering the left and right travel switches at the same position, causing each left and right travel switch at the same position to output a switching signal. A travel trigger plate is fixed on the wedge-shaped trigger rod and moves with it. A left magnetic probe and a right magnetic probe are respectively mounted at both ends of the travel trigger plate. The left and right magnetic probes cooperate with the corresponding travel sensors to trigger the left and right travel sensors to output an analog signal.

[0009] Furthermore, the wedge-shaped trigger rod includes a small-diameter section, an inclined section, and a large-diameter section connected in sequence. The small-diameter section does not trigger the left and right limit switches, the large-diameter section triggers the left and right limit switches, and the inclined section causes the left and right limit switches to be triggered instead of not being triggered.

[0010] Furthermore, the number of limit switches is 5 to 8 pairs.

[0011] Furthermore, the stroke sensor is a stroke sensor that outputs a 4-20mA analog signal.

[0012] Furthermore, when the wedge-shaped trigger rod does not trigger the limit switch, the limit switch sends a "0" signal; when the wedge-shaped trigger rod triggers the limit switch, the limit switch sends a "1" signal.

[0013] Furthermore, the master control base plate is fixed to the main beam, cement base, or special fixing device near the turbine servo.

[0014] Furthermore, the master control base plate includes a middle base plate and a left base plate and a right base plate arranged parallel to the middle base plate. The left travel sensor and the left travel switch are installed on the left base plate, and the right travel switch and the right travel sensor are installed on the right base plate.

[0015] Beneficial Effects: Compared with existing technologies, this invention has the following advantages: It can output two completely independent digital signals and two completely independent analog signals at the same location, resulting in higher signal security, accuracy, and reliability. This invention is used for monitoring the guide vane stroke signal of a hydroelectric turbine, and can output redundant digital and analog signals, unaffected by weather, location, time, or unit operating conditions. It can further improve the automation level of fault prediction and diagnosis, reduce reliance on on-site personnel, and optimize fault handling processes. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a mechanical guide vane master controller provided in an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the wedge-shaped trigger rod in an embodiment of this utility model. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Appendix Figures 1 to 2 The accompanying figure labels are as follows:

[0020] 1. Master control base plate; 2. Right limit switch; 3. Right limit sensor; 4. Right magnetic probe; 5. Triggered limit switch; 6. Wedge trigger rod; 601. Small diameter section; 602. Inclined section; 603. Large diameter section; 7. Left magnetic probe; 8. Limit trigger plate; 9. Left limit sensor; 10. Left limit switch.

[0021] like Figure 1 and Figure 2 As shown, this utility model embodiment provides a mechanical guide vane master controller, including a master control base plate 1 and a wedge-shaped trigger rod 6. The master control base plate 1 is fixed on the main beam, cement base or special fixing device near the turbine relay.

[0022] A left travel sensor 9 and a right travel sensor 3 are mounted in parallel on the master control base plate 1. Five to eight pairs of travel switches are installed between the left and right travel sensors along a direction parallel to the travel sensors. Each pair of travel switches includes a left travel switch 10 and a right travel switch 2 arranged opposite to each other.

[0023] The wedge-shaped trigger rod 6 comprises a small-diameter section 601, an inclined section 602, and a large-diameter section 603 connected in sequence. When the wedge-shaped trigger rod 6 moves through the channel formed between multiple pairs of left and right limit switches, the small-diameter section 601 does not trigger the left and right limit switches, while the large-diameter section 603 triggers the left and right limit switches at the same position, causing each of the left and right limit switches at the same position to output a switching signal. The inclined section 602 serves to switch the left and right limit switches from non-triggered to triggered. When the wedge-shaped trigger rod 6 does not trigger the limit switches, the limit switches emit a "0" signal; when the wedge-shaped trigger rod 6 triggers the limit switches, the limit switches emit a "1" signal.

[0024] A stroke trigger plate 8, which moves with the wedge-shaped trigger rod 6, is fixed on it. A left magnetic probe 7 and a right magnetic probe 4 are respectively mounted at both ends of the stroke trigger plate 8, with the magnetic probes positioned above the stroke sensors. The left and right magnetic probes cooperate with their respective stroke sensors, triggering each sensor to output an analog signal. In this embodiment, the stroke sensors are independently powered externally. As the magnetic probes move from one end of the stroke sensor to the other, they can output a 4–20 mA analog signal to characterize the guide vane opening from 0% to 100%.

[0025] In this embodiment, the master control base plate 1 is divided into three parts, including a middle base plate and a left and right base plate arranged parallel to the middle base plate. The left travel sensor 9 and the left travel switch 10 are installed on the left base plate, and the right travel switch 2 and the right travel sensor 3 are installed on the right base plate.

[0026] The working principle of this utility model is as follows:

[0027] Switch signal output: When the inclined section 602 of the wedge-shaped trigger rod 6 contacts the left and right limit switches, the left and right limit switches begin to operate; when the large-diameter section 603 of the wedge-shaped trigger rod 6 fully contacts the left and right limit switches, the left and right limit switch signals change. The left and right limit switches are used to output redundant limit switch signals for the master controller.

[0028] Analog signal output: When the wedge-shaped trigger rod 6 drives the stroke trigger plate 8 to move, the left and right magnetic probes run on the corresponding stroke sensors, triggering the stroke sensors to emit a 4-20mA signal to characterize the current guide vane position. The left and right stroke sensors are used to output redundant analog signals to the master controller.

[0029] The mechanical guide vane master controller provided in this embodiment outputs guide vane position switch signals and analog signals to the monitoring LCU cabinet and speed controller electrical cabinet controller, realizing functions such as data interaction and working condition process control.

Claims

1. A mechanical guide vane master controller, characterized in that, The system includes a master control base plate (1) and a wedge-shaped trigger rod (6). A left travel sensor (9) and a right travel sensor (3) are mounted in parallel on the master control base plate (1). Multiple pairs of travel switches are installed between the left and right travel sensors along a direction parallel to the travel sensors. Each pair of travel switches includes a left travel switch (10) and a right travel switch (2) arranged opposite to each other. The wedge-shaped trigger rod (6) moves through the channel formed between the multiple pairs of left and right travel switches, which can trigger the left and right travel switches at the same position, so that each of the left and right travel switches at the same position outputs a switch signal. A travel trigger plate (8) that moves with the wedge-shaped trigger rod (6) is fixed on it. A left magnetic probe (7) and a right magnetic probe (4) are installed at both ends of the travel trigger plate (8). The left and right magnetic probes cooperate with the corresponding travel sensors to trigger each of the left and right travel sensors to output an analog signal.

2. The mechanical guide vane master controller according to claim 1, characterized in that, The wedge-shaped trigger rod (6) includes a small diameter section (601), an inclined section (602), and a large diameter section (603) connected in sequence. The small diameter section (601) does not trigger the left and right limit switches, the large diameter section (603) triggers the left and right limit switches, and the inclined section (602) causes the left and right limit switches to change from not triggering to triggering.

3. The mechanical guide vane master controller according to claim 1, characterized in that, The number of limit switches is 5 to 8 pairs.

4. The mechanical guide vane master controller according to claim 1, characterized in that, The stroke sensor is a stroke sensor that outputs a 4-20mA analog signal.

5. The mechanical guide vane master controller according to claim 1, characterized in that, When the wedge trigger rod (6) does not trigger the limit switch, the limit switch sends a "0" signal; when the wedge trigger rod (6) triggers the limit switch, the limit switch sends a "1" signal.

6. The mechanical guide vane master controller according to claim 1, characterized in that, The master control base plate (1) is fixed to the main beam, cement base or special fixing device near the turbine relay.

7. The mechanical guide vane master controller according to claim 6, characterized in that, The master control base plate (1) includes a middle base plate and a left base plate and a right base plate arranged parallel to the middle base plate. The left travel sensor (9) and the left travel switch (10) are installed on the left base plate, and the right travel switch (2) and the right travel sensor (3) are installed on the right base plate.

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