High-precision monitoring device for valve core of water turbine unit isolation valve

Abstract

The utility model discloses a high accuracy monitoring device of water turbine isolation valve core, including the isolation valve, and the isolation valve inside design has the valve core, and the valve core one end exposes in the isolation valve outside and is connected through fixed nut screw thread with horizontal link, and the horizontal link other end moving block connects, still including the vertical link of connecting on the push wheel, and the vertical link top is connected on the vertical induction board, and the vertical link sleeve sets up the sleeve, and the sleeve fixed connection is in the protection cover inner wall, and the vertical induction board top is provided with the mounting panel, and is equipped with distance sensor on the mounting panel, and distance sensor is used for detecting the distance between mounting panel with mounting panel. The utility model can improve the precision, reliability and anti -interference of isolation valve core position monitoring significantly, can realize high accuracy positioning function. Through the rigid sliding fit of guide rail and moving block combines the positioning hole, ensure the linearity and repeatability accuracy of valve core displacement detection, eliminate the mechanical clearance error of traditional hinge structure.

Description

Technical Field

[0001] This utility model relates to the field of hydropower unit speed governor control technology, and in particular to a high-precision monitoring device for the valve core of an isolation valve used in large hydropower units with integrated guide rail positioning and buffer damping. Background Technology

[0002] The governor system of large hydropower units controls turbine output by adjusting the opening of guide vanes or nozzles. As a key actuator in the governor's hydraulic control circuit, the precise monitoring of the valve core position of the isolation valve directly affects the stability and response speed of the unit's operation. Currently, most isolation valve cores employ a horizontal mechanical displacement structure, but existing technology has the following shortcomings: (1) Traditional isolation valve core status monitoring mainly relies on mechanical limit switches. Pressure fluctuations and mechanical vibrations in the hydraulic system can easily cause contact sensors to be falsely triggered, resulting in problems such as poor vibration resistance, inaccurate positioning, and susceptibility to environmental interference.

[0003] (2) Although traditional contact position switches have a simple structure, the valve core moves at high speed and has a large impact force. Long-term and frequent collisions can easily lead to wear, adhesion or fatigue fracture of the switch contacts, which seriously affects the reliability of monitoring and may even cause malfunctions.

[0004] (3) Traditional position monitoring can also use non-contact sensors (such as inductive or capacitive proximity switches). Although this avoids mechanical wear, the valve core of the isolation valve is mostly installed with a horizontal mechanical displacement structure, and its effective sensing distance is usually no more than 5 mm. However, the movement stroke of the valve core of the isolation valve can often reach 20~200 mm, making it difficult for non-contact displacement sensors to directly detect the position of the valve core in the horizontal direction. Even if multi-segment installation or multi-sensor collaboration is used, there are still problems such as signal jump, detection blind zone or high cost.

[0005] In summary, existing valve core position monitoring technologies have significant shortcomings in terms of reliability, adaptability, and ease of installation. There is an urgent need for a new type of monitoring device that can avoid the impact of mechanical shock, meet the needs of long-distance detection, and simultaneously satisfy the hydropower industry's requirements for high protection and low maintenance costs. Utility Model Content

[0006] The purpose of this invention is to provide a high-precision monitoring device for the valve core of the isolation valve of a hydropower unit, so as to solve the problems in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A high-precision monitoring device for the valve core of a hydropower unit isolation valve includes an isolation valve with a valve core designed inside. One end of the valve core is exposed outside the isolation valve and is threadedly connected to a horizontal rod via a fixing nut. The other end of the horizontal rod is connected to a moving block, which is housed inside a protective cover. It also includes a vertical rod connected to the push wheel, the top of the vertical rod being connected to a vertical sensing plate, the vertical rod being fitted with a sleeve, the sleeve being fixedly connected to the inner wall of the protective cover, and a mounting plate being provided above the vertical sensing plate, the mounting plate being provided with a distance sensor, the distance sensor being used to detect the distance between the mounting plate and the mounting plate.

[0008] Preferably, the fixing nut is provided with a positioning hole, which is used to position the connecting valve core and the horizontal rod.

[0009] Preferably, the top surface of the movable block is constructed as an arc or an inclined plane.

[0010] Preferably, the base plate is provided with a track for the drive wheel to move smoothly along the track as the horizontal bar moves.

[0011] Preferably, a guide plate is also fixedly provided on the bottom plate of the protective cover, and a guide hole is provided in the guide plate. A guide post is connected to the bottom of the vertical sensing plate, and the lower end of the guide post is slidably inserted into the guide hole.

[0012] Preferably, the outer wall of the guide post is provided with a polytetrafluoroethylene lubricating layer.

[0013] Preferably, the vertical sensing plate, mounting plate, and guide column are made of stainless steel, aluminum alloy, or titanium alloy.

[0014] Preferably, a spring is also fixedly connected between the push wheel and the vertical rod.

[0015] Preferably, the distance sensor is a laser displacement sensor.

[0016] Preferably, one side of the protective cover is provided with a detachable access door.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The high-precision monitoring device for the valve core of the isolation valve of the hydropower unit provided by this utility model significantly improves the accuracy, reliability, and anti-interference ability of the valve core position monitoring, and can realize high-precision positioning function. By using the rigid sliding fit between the guide rail and the moving block and the positioning hole, the linearity and repeatability of the valve core displacement detection are ensured, eliminating the mechanical backlash error of the traditional hinge structure.

[0018] The guide plate and base plate enhance the overall resistance to deformation, the protective cover is dustproof and moisture-proof, compact and durable, and can extend the service life of the device in humid hydroelectric environments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a partial structural schematic diagram of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of the moving block in one embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the moving block in another embodiment of the present invention.

[0023] In the above diagram: 1. Isolation valve; 2. Valve core; 3. Positioning hole; 4. Fixing nut; 5. Guide rail; 6. Moving block; 7. Push wheel; 8. Buffer pad; 9. Vertical sensing plate; 10. Mounting plate; 11. Sensor; 12. Protective cover; 13. Vertical rod; 14. Horizontal rod; 15. Sleeve; 16. Guide column; 17. Guide plate; 18. Base plate. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solution of this utility model, the preferred embodiments of this utility model are described below in conjunction with specific examples. However, it should be understood that the accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0025] As a preferred embodiment of this utility model, this embodiment provides a high-precision monitoring device for the valve core of a hydroelectric generator isolation valve, such as... Figure 1-3 As shown, the device includes an isolation valve 1, which has a valve core 2 inside. One end of the valve core 2 is exposed outside the isolation valve 1 and is threadedly connected to a horizontal rod 14 via a fixing nut 4. The other end of the horizontal rod 14 is connected to a moving block 6. The moving block 6 is set inside a protective cover 12 to protect the horizontal rod and the moving block from impacting the equipment and preventing personnel injury when the valve core moves. It also prevents accidental contact by personnel. A track is constructed on the base plate 18 to drive the wheel 7 to move smoothly on the track as the horizontal rod moves. It also includes a vertical rod 13 connected to the push wheel 7. The top of the vertical rod 13 is connected to the vertical sensing plate 9. The vertical rod 13 is fitted with a sleeve 15. The sleeve 15 is fixedly connected to the inner wall of the protective cover 12. A mounting plate 10 is provided above the vertical sensing plate 9. A distance sensor 11 is provided on the mounting plate 10. The distance sensor 11 is a non-contact sensing sensor and is used to detect the distance between the mounting plate 10 and the mounting plate 12.

[0026] The drive wheel 7 is a circular ball wheel, which facilitates smooth movement on the moving block track and meets the requirements for long-term and repeated movement.

[0027] In the above embodiments, the distance sensor 11 is a laser displacement sensor.

[0028] In the above embodiments, such as Figure 1 As shown, the fixing nut 4 is provided with a positioning hole 3, which is used to position the valve core 2 and the horizontal rod 14.

[0029] In some embodiments, a removable access door may be provided on one side of the protective cover 12 for easy observation and maintenance.

[0030] In some embodiments, such as Figure 3 and Figure 4 As shown, based on the data acquisition needs of the distance sensor 11, and while ensuring the reliability of the acquired data, the top surface of the moving block 6 is either arc-shaped or inclined, in order to better adapt to the needs of data acquisition and processing.

[0031] In some preferred embodiments, such as Figure 2 As shown, in order to prevent the position of the moving block from shifting when it moves, and thus avoid the vertical sensing plate from failing to sense the sensor, a guide plate 17 is also fixedly provided on the bottom plate 18 of the protective cover 12. A guide hole is provided in the guide plate 17. A guide post 16 is connected to the bottom of the vertical sensing plate 9. The lower end of the guide post 16 is slidably inserted into the guide hole.

[0032] In some preferred embodiments, to achieve lightweight while ensuring structural strength, the vertical sensing plate 9, mounting plate 10, and guide column 16 are made of stainless steel, aluminum alloy, or titanium alloy.

[0033] To improve the wear resistance of the guide post 16 during the guiding process, a polytetrafluoroethylene lubricating layer is provided on the outer wall of the guide post 16.

[0034] In other preferred embodiments, such as Figure 3As shown, a spring 8 is also fixedly connected between the push wheel 7 and the vertical rod 13. The spring 8 absorbs hydraulic shocks and high-frequency vibrations, suppressing instantaneous fluctuations between the push wheel 7 and the valve core, making the data collected by the distance sensor more stable and achieving dynamic vibration compensation. When the moving block 6 and the push wheel 7 come into contact, the spring 8 acts as a buffer, allowing the sleeve 15 to move smoothly upwards under the impact of the valve core 2, thus converting the horizontal movement of the valve core 2 into vertical movement.

[0035] Working principle: First, install the fixing nut 4 on the thread on the side of the valve core 2; The second step is to connect the horizontal rod 14 to the positioning hole 3 and the valve core 2 using the fixing nut 4, and to initially adjust the distance between the valve core 2, the positioning hole 3 and the horizontal rod 14. The third step is to connect the horizontal rod 14 and the moving block 6 with the connecting nut, and to initially adjust the distance between the horizontal rod 14 and the moving block 6. Fourth step: Adjust the position of the guide rail on the base plate 18 according to the position of the moving block 6 to ensure that the moving block 6 can move smoothly and steadily within the guide rail; Fifth step, fine-tune the position of the positioning hole and secure it with the fixing nut to ensure that the valve core 2 and the horizontal rod can move smoothly in the horizontal direction without jamming or offset; Step 6: Fine-tune the position of the horizontal bar and the moving block 6, and secure them securely with the connecting nut to ensure that the moving block can move smoothly in the guide rail under the push of the horizontal bar, and to ensure that the moving block moves without deviation or jamming. Step 7: According to the effective sensing distance requirements of the sensor, fix the mounting plate on top of the valve body, ensuring that there is sufficient distance between the mounting plate and the vertical sensing plate; Step 8: Adjust the distance between the vertical sensing plate and the sensor according to the effective sensing distance requirements of the sensor to ensure that the sensor can effectively detect the distance of the vertical sensing plate within this distance. Step 9: When the isolation valve opens, the valve core extends outward. After being fixed by the positioning hole, the valve core drives the horizontal rod forward, causing the moving block to move forward within the track until it touches the push wheel. This causes the push wheel to move vertically upward on the curved surface of the moving block, which in turn causes the vertical sensing plate to move vertically upward. When the vertical sensing plate moves to the effective sensing distance of the sensor, the sensor detects the action signal and sends out a signal indicating that the isolation valve is fully open. Step 10: When the isolation valve is closed, the valve core retracts inward, causing the horizontal rod to move backward. This moves the moving block backward within the track, which in turn moves the vertical sensing plate downward. When the vertical sensing plate can no longer detect the effective sensing distance of the sensor, the sensor's detection action signal resets, and a fully closed position signal for the isolation valve is issued.

[0036] Step 11: Install a protective cover to prevent the moving block from injuring people or damaging equipment when it moves.

[0037] The above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-precision monitoring device for the valve core of a hydropower unit isolation valve, characterized in that, Includes an isolation valve (1), which has a valve core (2) inside. One end of the valve core (2) is exposed outside the isolation valve (1) and is threadedly connected to the horizontal rod (14) by a fixing nut (4). The other end of the horizontal rod (14) is connected to a moving block (6), which is set inside the protective cover (12). It also includes a vertical rod (13) connected to the push wheel (7), the top of the vertical rod (13) being connected to the vertical sensing plate (9), the vertical rod (13) being fitted with a sleeve (15), the sleeve (15) being fixedly connected to the inner wall of the protective cover (12), and an mounting plate (10) being provided above the vertical sensing plate (9), the mounting plate (10) being provided with a distance sensor (11), the distance sensor (11) being used to detect the distance between the mounting plate (10) and the mounting plate (10).

2. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 1, characterized in that, The fixing nut (4) is provided with a positioning hole (3), which is used to position the connecting valve core (2) and the horizontal rod (14).

3. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 1, characterized in that, A guide plate (17) is also fixedly provided on the bottom plate (18) of the protective cover (12). A guide hole is provided in the guide plate (17). A guide post (16) is connected to the bottom of the vertical sensing plate (9). The lower end of the guide post (16) is slidably inserted into the guide hole.

4. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 3, characterized in that, The base plate (18) is provided with a track for driving the wheel (7) to move smoothly along the track as the horizontal bar moves.

5. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 1, characterized in that, The top surface of the moving block (6) is constructed as an arc or an inclined plane.

6. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 3, characterized in that, The outer wall of the guide column (16) is provided with a polytetrafluoroethylene lubricating layer.

7. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 1, characterized in that, The vertical sensing plate (9), mounting plate (10), and guide column (16) are made of stainless steel, aluminum alloy, or titanium alloy.

8. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 1, characterized in that, A spring (8) is also fixedly connected between the push wheel (7) and the vertical rod (13).

9. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 1, characterized in that, The distance sensor (11) is a laser displacement sensor.

10. The high-precision monitoring device for the valve core of the isolation valve of a hydropower unit according to claim 1, characterized in that, The protective cover (12) has a detachable inspection door on one side.

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