Non-invasive main pressure regulating valve range measuring system and method

Abstract

The application relates to a non-invasive main pressure regulating valve stroke measurement system and method, and belongs to the technical field of displacement measurement. The application comprises: a main pressure regulating valve comprising a main pressure regulating valve body, a main pressure regulating valve spool slidably connected in the main pressure regulating valve body, and a first displacement sensor for measuring the stroke of the main pressure regulating valve spool; a servomotor comprising a servomotor shell, a servomotor piston rod, and a second displacement sensor for measuring the stroke of the servomotor piston rod; and a controller for controlling the conversion of the main pressure regulating valve from a middle position to an on position or an off position, and calculating the displacement speed of the servomotor according to the measured value of the second displacement sensor, and obtaining the value of the first displacement sensor as the on-side stroke or the off-side stroke when the displacement speed exceeds a preset threshold value. According to the application, when the displacement speed of the servomotor exceeds the preset threshold value, it is determined that the main pressure regulating valve is just at the on position or the off position, and the value of the first displacement sensor is the on-side stroke or the off-side stroke, thereby improving the work efficiency.

Description

Technical Field

[0001] This application relates to the field of displacement measurement technology, and in particular to a non-invasive main pressure regulating valve offset measurement system and method. Background Technology

[0002] As the most important control component in the hydropower unit speed control system, the main pressure regulating valve should not only be able to control a sufficiently large oil delivery volume, but also operate flexibly and reliably. The main piston and bushing of the main pressure regulating valve have a slack design requirement. The larger the slack, the larger the speed dead zone, which directly affects the primary frequency regulation effect; the smaller the slack, the higher the static oil consumption, and the more flexible the valve core switching.

[0003] A power plant requires that the sum of the open-side and closed-side obstructions of the main pressure distribution valve after installation be within the range of 1.4mm to 2.0mm, and the closed-side obstruction within the range of 0.8mm to 1.1mm, with the open-side obstruction being slightly smaller than the closed-side obstruction. Because the power plant units do not meet the primary frequency regulation requirements of the power grid, it is necessary to measure whether the obstruction of the main pressure distribution valve is within the design range.

[0004] like Figure 1 As shown, the traditional method for measuring the opening and closing travel of the main pressure regulating valve is to disassemble the main pressure regulating valve, measure the distance L1 between the lower part of the opening piston and the upper part of the closing piston, measure the distance L2 between the upper part of the opening port and the lower part of the closing port of the main pressure regulating valve bushing, measure the distance L3 between the lower end of the closing piston and the upper end of the main pressure regulating valve piston, measure the distance L4 between the lower part of the closing port of the main pressure regulating valve and the upper end cover of the main pressure regulating valve, and measure the distance L5 between the top of the piston and the end of the main pressure regulating valve after reassembling the main pressure regulating valve.

[0005] The total travel of the main pressure regulating valve is L6 = L1 - L2; the travel on the closed side is L7 = L3 - L5 - L4; and the travel on the open side is L8 = L6 - L7. The entire measurement process requires disassembling the main pressure regulating valve, which results in low measurement efficiency and safety hazards. Summary of the Invention

[0006] This application provides a non-invasive main pressure regulating valve occlusion measurement system and method to solve the problem that measuring the open and closed occlusion of the main pressure regulating valve in related technologies requires disassembling the main pressure regulating valve, which results in low measurement efficiency and safety hazards.

[0007] The first aspect of this application provides a non-invasive main pressure regulating valve offset measurement system, comprising: The main pressure regulating valve includes a main pressure regulating valve body, a main pressure regulating valve core slidably connected within the main pressure regulating valve body, and a first displacement sensor for measuring the stroke of the main pressure regulating valve core. A relay device, comprising a relay device housing, a relay device piston rod slidably connected inside the relay device housing, and a second displacement sensor for measuring the stroke of the relay device piston rod; The controller controls the main pressure regulating valve to switch from the neutral position to the open or closed position, and calculates the displacement speed of the relay based on the measurement value of the second displacement sensor. When the displacement speed exceeds a preset threshold, the value of the first displacement sensor is obtained as the open side blockage or the closed side blockage.

[0008] In some embodiments: the main pressure regulating valve body is provided with a main oil inlet, an open-side oil outlet and a closed-side oil outlet, and the main oil inlet is connected to a pressure oil source through a first pressure oil pipe; A first piston is slidably connected inside the receiver housing. The first piston is fixedly connected to the receiver piston rod. The first piston divides the receiver housing into an open-side oil chamber and a closed-side oil chamber. The open-side oil outlet is connected to the open-side oil chamber via a second pressure oil pipe, and the closed-side oil outlet is connected to the closed-side oil chamber via a third pressure oil pipe.

[0009] In some embodiments: the main pressure regulating valve core includes an opening piston that opens or closes the opening side oil outlet, a closing piston that opens or closes the closing side oil outlet, and a connecting rod connecting the opening piston and the closing piston. The diameters of the opening piston and the closing piston are larger than the diameter of the connecting rod, and the main oil inlet is located on the periphery of the connecting rod.

[0010] In some embodiments: a valve cover is provided on the top of the main pressure regulating valve body, and a valve stem is slidably and sealingly connected inside the valve cover. One end of the valve stem extending into the main pressure regulating valve body is connected to the valve core of the main pressure regulating valve. One end of the valve stem extending out of the main pressure regulating valve body is connected to a valve core drive mechanism that drives the valve core of the main pressure regulating valve to switch from the neutral position to the open position or the closed position within the main pressure regulating valve body.

[0011] In some embodiments: a second piston is fixedly connected to the valve stem and slidably sealed to the valve cover; a closed upper control chamber is formed between the second piston and the valve cover; and a closed lower constant pressure chamber is formed between the bottom of the main pressure regulating valve core and the main pressure regulating valve body. The valve core drive mechanism includes a guide valve that connects the upper control chamber and the lower constant pressure chamber via a control oil circuit. The guide valve is connected to a linear motor that drives its state transition. A third displacement sensor that measures its stroke is connected to the linear motor.

[0012] In some embodiments: the linear motor and the third displacement sensor are both connected to the controller. The controller controls the linear motor to drive the pilot valve to switch back and forth between the neutral position, the on position, and the off position. The third displacement sensor acquires the stroke of the linear motor to determine whether the pilot valve is in the neutral position, the on position, or the off position.

[0013] In some embodiments: the first displacement sensor, the second displacement sensor, and the third displacement sensor are micrometer-level laser displacement sensors or fiber optic displacement sensors, and the measurement accuracy of the first displacement sensor, the second displacement sensor, and the third displacement sensor is not less than 10 μm, and the effective measurement range is not less than 20 mm.

[0014] In some embodiments, the system further includes a turbine housing, wherein a guide vane for adjusting the flow opening of the turbine housing is rotatably connected inside the turbine housing, and the output end of the servo is connected to the guide vane to adjust the rotation angle of the guide vane.

[0015] In some embodiments: the controller is connected to a touch screen display, which displays instruction buttons for controlling the controller, to display the displacement speed of the relay output by the controller, and the value of the first displacement sensor.

[0016] A second aspect of this application provides a non-invasive method for measuring the apex displacement of a main pressure regulating valve. The method uses the non-invasive main pressure regulating valve apex displacement measurement system described in any of the above embodiments. The method includes: The controller adjusts the guide vane to a preset opening degree through the main pressure regulating valve command relay, and controls the main pressure regulating valve to return to the neutral position, setting the value of the first displacement sensor to zero; The displacement value of the relay is measured using a second displacement sensor, and the first displacement velocity of the relay is calculated. The controller controls the main pressure regulating valve to move gradually from the neutral position to the open or closed position. Whenever the main pressure regulating valve core moves a preset stroke, the controller controls the main pressure regulating valve core to remain for a preset time. The controller uses the second displacement sensor to measure the displacement value of the relay again in real time, and the controller calculates the second displacement velocity of the relay every preset time period. When the second displacement velocity is greater than the first displacement velocity to a preset threshold, the controller obtains the value of the first displacement sensor, which is the opening or closing limit of the main pressure regulating valve. The controller adjusts the guide vane to restore it to the preset opening degree via the main pressure regulating valve command relay.

[0017] The beneficial effects of the technical solution provided in this application include: This application provides a non-invasive main pressure regulating valve travel measurement system and method. The non-invasive main pressure regulating valve travel measurement system includes a main pressure regulating valve body, a main pressure regulating valve core slidably connected within the main pressure regulating valve body, and a first displacement sensor for measuring the travel of the main pressure regulating valve core; a relay, including a relay housing, a relay piston rod slidably connected within the relay housing, and a second displacement sensor for measuring the travel of the relay piston rod; and a controller that controls the main pressure regulating valve to switch from a neutral position to an open or closed position, and calculates the displacement speed of the relay based on the measurement value of the second displacement sensor. When the displacement speed exceeds a preset threshold, the value of the first displacement sensor is obtained as the open-side travel or closed-side travel.

[0018] Therefore, the non-invasive main pressure regulating valve travel measurement system of this application has a first displacement sensor on the main pressure regulating valve to measure the valve core travel, and a second displacement sensor on the servo actuator to measure the piston rod travel. The main pressure regulating valve has three states: neutral, open, and closed. When the main pressure regulating valve is in the neutral position, the displacement speed of the servo actuator is small. When the main pressure regulating valve is in the open or closed position, the displacement speed of the servo actuator is larger than that in the neutral position. When the controller controls the main pressure regulating valve to gradually switch from the neutral position to the open or closed position, and calculates the displacement speed of the servo actuator based on the measurement value of the second displacement sensor, when the displacement speed exceeds a preset threshold, the value of the first displacement sensor is obtained as the open-side travel or closed-side travel, avoiding the need to disassemble the main pressure regulating valve and greatly improving work efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of disassembling the main pressure regulating valve to measure the open and closed side obstruction in the background art; Figure 2 This is a schematic diagram of the non-invasive main pressure regulating valve offset measurement system according to an embodiment of this application; Figure 3 This is a schematic diagram of the main pressure regulating valve in an embodiment of this application.

[0021] Figure label: 1. Controller; 2. First pressure oil pipe; 3. Third pressure oil pipe; 4. Second pressure oil pipe; 5. Control oil circuit; 6. Guide vane; 10. Main pressure regulating valve; 11. Main pressure regulating valve body; 12. Main pressure regulating valve core; 13. First displacement sensor; 20. Relay unit; 21. Relay unit housing; 22. Relay unit piston rod; 23. Second displacement sensor; 24. First piston; 25. Open side oil chamber; 26. Closed side oil chamber; 30. Valve core drive mechanism; 31. Pilot valve; 32. Linear motor; 33. Third displacement sensor; 111. Main oil inlet; 112. Closed side oil outlet; 113. Open side oil outlet; 114. Valve cover; 115. Valve stem; 116. Second piston; 117. Upper control chamber; 118. Lower constant pressure chamber; 121. Closed chamber piston; 122. Open chamber piston; 123. Connecting rod. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] This application provides a non-invasive main pressure regulating valve occlusion measurement system and method, which can solve the problems of low measurement efficiency and safety hazards caused by the need to disassemble the main pressure regulating valve to measure the open and closed occlusion of the main pressure regulating valve.

[0024] See Figure 2 and Figure 3 As shown, the first aspect of this application provides a non-invasive main pressure regulating valve offset measurement system, comprising: The main pressure regulating valve 10 includes a valve body 11, a valve core 12 slidably connected within the valve body 11, and a first displacement sensor 13 for measuring the stroke of the valve core 12. The main pressure regulating valve 10 has three states: neutral, open, and closed. When the main pressure regulating valve 10 is in the neutral state, the control relay 20 is held at a preset position to maintain the guide vane 6 at a certain opening degree. When the main pressure regulating valve 10 is in the open state, the control relay 20 drives the guide vane 6 to increase the opening degree. When the main pressure regulating valve 10 is in the closed state, the control relay 20 drives the guide vane 6 to decrease the opening degree.

[0025] The relay 20 includes a relay housing 21, within which a relay piston rod 22 is slidably connected, and a second displacement sensor 23 measures the stroke of the relay piston rod 22. When the main pressure regulating valve 10 injects hydraulic oil into the relay housing 21, the hydraulic oil pushes the relay piston rod 22 to reciprocate within the housing 21, thereby causing the piston rod 22 to drive the guide vane 6 to rotate and adjust the opening of the guide vane 6. When the main pressure regulating valve 10 stops injecting hydraulic oil into the housing 21, the piston rod 22 stops driving the guide vane 6 to rotate, thus maintaining the opening of the guide vane 6.

[0026] Controller 1 controls the main pressure regulating valve 10 to switch from the neutral position to the on position, and calculates the displacement speed of the relay 20 based on the measurement value of the second displacement sensor 23. When the displacement speed of the relay 20 exceeds a preset threshold, controller 1 obtains the value of the first displacement sensor 13 as the opening side obstruction distance of the main pressure regulating valve 10. Controller 1 also controls the main pressure regulating valve 10 to switch from the neutral position to the off position, and calculates the displacement speed of the relay 20 based on the measurement value of the second displacement sensor 23. When the displacement speed of the relay 20 exceeds a preset threshold, controller 1 obtains the value of the first displacement sensor 13 as the closing side obstruction distance of the main pressure regulating valve 10.

[0027] The specific setting of the preset threshold mentioned above, such as determining that the main pressure regulating valve 10 switches from the neutral position to the open or closed position when the displacement speed of the servo motor 20 reaches a certain speed value or above, varies depending on the model of the servo motor 20. The preset threshold for each model of servo motor 20 is set according to the actual measured data under working conditions.

[0028] For example, a preset threshold can be set to 0.004 mm / s-0.02 mm / s. This preset threshold is the critical point for the main pressure regulating valve 10 to switch from the neutral position to the on or off position. When the displacement speed of the servo motor 20 reaches the speed range of 0.004-0.02 mm / s, it is determined that the main pressure regulating valve 10 is about to switch from the neutral position to the on or off position. When the displacement speed of the servo motor 20 is greater than 0.02 mm / s, the change in displacement speed of the servo motor 20 will increase sharply, at which point the main pressure regulating valve 10 has switched to the on or off position.

[0029] The preset threshold can also be set by those skilled in the art as the ratio of the displacement velocity currently measured by the relay 20 to the displacement velocity measured previously. When the ratio is greater than, for example, 1 to 2, it is determined that the main pressure regulating valve 10 has switched from the neutral position to the open or closed position. Alternatively, the preset threshold can also be set as the difference between the displacement velocity currently measured by the relay 20 and the displacement velocity measured previously. When the difference is greater than 0.003 mm / s, it is determined that the main pressure regulating valve 10 has switched from the neutral position to the open or closed position.

[0030] The non-invasive main pressure regulating valve travel measurement system of this application embodiment has a first displacement sensor 13 on the main pressure regulating valve 10 to measure the travel of the valve core 12, and a second displacement sensor 23 on the servo actuator 20 to measure the travel of the piston rod 22. The main pressure regulating valve 10 has three states: neutral position, open position, and closed position. When the main pressure regulating valve 10 is in the neutral position, a small amount of oil seeps into the servo actuator 20, resulting in a small displacement speed of the servo actuator 20.

[0031] When the main pressure regulating valve 10 starts switching to the on or off position, it begins to inject a large flow of oil into the servo motor 20, significantly increasing the displacement speed of the servo motor 20 compared to when the main pressure regulating valve 10 is in the neutral position. When the controller 1 controls the main pressure regulating valve 10 to gradually switch from the neutral position to the on or off position, it calculates the displacement speed of the servo motor 20 based on the measurement values ​​from the second displacement sensor 23. When the displacement speed exceeds a preset threshold, the value from the first displacement sensor 13 is used to determine the open or closed side clearance of the main pressure regulating valve 10. This avoids disassembling the main pressure regulating valve 10 for clearance measurement, greatly improving work efficiency.

[0032] In some alternative embodiments: see Figure 2 and Figure 3 As shown, this application embodiment provides a non-invasive main pressure regulating valve offset measurement system. The main pressure regulating valve body 11 of the non-invasive main pressure regulating valve offset measurement system has a main oil inlet 111, an open-side oil outlet 113 and a closed-side oil outlet 112. The main oil inlet 111 is connected to a pressure oil source through a first pressure oil pipe 2. The pressure oil source is a hydraulic oil pump.

[0033] The main pressure regulating valve core 12 reciprocates up and down within the main pressure regulating valve body 11. When the main pressure regulating valve core 12 simultaneously closes both the open-side oil outlet 113 and the closed-side oil outlet 112, the main pressure regulating valve 10 is in the neutral position. When the main pressure regulating valve core 12 closes the open-side oil outlet 113 and opens the closed-side oil outlet 112, the main pressure regulating valve 10 is in the off position. When the main pressure regulating valve core 12 opens the open-side oil outlet 113 and closes the closed-side oil outlet 112, the main pressure regulating valve 10 is in the on position.

[0034] A first piston 24 is slidably connected inside the relay housing 21. The first piston 24 is fixedly connected to the relay piston rod 22. The first piston 24 divides the relay housing 21 into an open-side oil chamber 25 and a closed-side oil chamber 26. The open-side oil outlet 113 is connected to the open-side oil chamber 25 through a second pressure oil pipe 4, and the closed-side oil outlet 112 is connected to the closed-side oil chamber 26 through a third pressure oil pipe 3.

[0035] In this embodiment of the application, when the main pressure regulating valve 10 is in the neutral position, the main pressure regulating valve core 12 controls both the open side oil outlet 113 and the closed side oil outlet 112 to be in the closed state. Both the open side oil outlet 113 and the closed side oil outlet 112 of the main pressure regulating valve 10 stop supplying oil to the open side oil chamber 25 and the closed side oil chamber 26 of the relay 20. The relay 20 is in a static holding state, thereby keeping the guide vane 6 at a preset opening.

[0036] In this embodiment of the application, when the main pressure regulating valve 10 is in the open position, the main pressure regulating valve core 12 of the main pressure regulating valve 10 controls the open side oil outlet 113 to open and the closed side oil outlet 112 to be in the closed state. The open side oil outlet 113 of the main pressure regulating valve 10 supplies oil to the open side oil chamber 25 of the servo 20, and the closed side oil outlet 112 of the main pressure regulating valve 10 discharges the hydraulic oil in the closed side oil chamber 26. The servo piston rod 22 of the servo 20 drives the guide vane 6 to rotate in the forward direction to increase the opening.

[0037] In this embodiment of the application, when the main pressure regulating valve 10 is in the off position, the main pressure regulating valve core 12 of the main pressure regulating valve 10 controls the closed side oil outlet 112 to open, and the open side oil outlet 113 to be in the closed state. The closed side oil outlet 112 of the main pressure regulating valve 10 supplies oil to the closed side oil chamber 26 of the servo 20, and the open side oil outlet 113 of the main pressure regulating valve 10 discharges the hydraulic oil in the open side oil chamber 25. The servo piston rod 22 of the servo 20 drives the guide vane 6 to rotate in the opposite direction to reduce the opening degree.

[0038] In some alternative embodiments: see Figure 2 and Figure 3 As shown, this application provides a non-invasive main pressure regulating valve offset measurement system. The main pressure regulating valve core 12 of this system includes an opening piston 122 that opens or closes the opening side oil outlet 113, a closing piston 121 that opens or closes the closing side oil outlet 112, and a connecting rod 123 connecting the opening piston 122 and the closing piston 121. The diameters of the opening piston 122 and the closing piston 121 are larger than the diameter of the connecting rod 123, and the main oil inlet 111 is located on the periphery of the connecting rod 123.

[0039] The main pressure regulating valve core 12 of this embodiment consists of an opening piston 122, a closing piston 121, and a connecting rod 123. The opening piston 122, the closing piston 121, and the connecting rod 123 are interconnected to form a dumbbell-shaped structure. The opening piston 122, the closing piston 121, and the connecting rod 123 reciprocate up and down within the main pressure regulating valve body 11 to open or close the opening side oil outlet 113 and the closing side oil outlet 112, respectively.

[0040] When the main pressure regulating valve core 12 moves upward to the preset position, the opening piston 122 closes the open side oil outlet 113, and the closing piston 121 opens the closed side oil outlet 112, connecting the main oil inlet 111 with the closed side oil outlet 112, and the main pressure regulating valve 10 is in the off position. When the main pressure regulating valve core 12 moves downward to the preset position, the opening piston 122 opens the open side oil outlet 113, and the closing piston 121 closes the closed side oil outlet 112, connecting the main oil inlet 111 with the open side oil outlet 113, and the main pressure regulating valve 10 is in the on position.

[0041] In some alternative embodiments: see Figure 2 and Figure 3 As shown, this application embodiment provides a non-invasive main pressure regulating valve offset measurement system. The main pressure regulating valve body 11 of the non-invasive main pressure regulating valve offset measurement system is provided with a valve cover 114 on the top. A valve stem 115 is slidably and sealed inside the valve cover 114. One end of the valve stem 115 extending into the main pressure regulating valve body 11 is connected to the main pressure regulating valve core 12.

[0042] One end of the valve stem 115 extending outside the main pressure regulating valve body 11 is connected to a valve core drive mechanism 30, which drives the main pressure regulating valve core 12 to switch from the neutral position to the open or closed position within the main pressure regulating valve body 11. A second piston 116 is fixedly connected to the valve stem 115 and slidably sealed to the valve cover 114. A closed upper control chamber 117 is formed between the second piston 116 and the valve cover 114, and a closed lower constant pressure chamber 118 is formed between the bottom of the main pressure regulating valve core 12 and the main pressure regulating valve body 11.

[0043] The valve core drive mechanism 30 includes a pilot valve 31 that connects the upper control chamber 117 and the lower constant pressure chamber 118 via a control oil circuit 5. The pilot valve 31 is connected to a linear motor 32 that drives its state transitions. A third displacement sensor 33 that measures its stroke is connected to the linear motor 32. The linear motor 32 is used to drive the pilot valve 31 to control the main pressure regulating valve 10 to switch between the neutral position, the on position, and the off position.

[0044] The pilot valve 31 injects preset oil pressure into the upper control chamber 117 and lower constant pressure chamber 118 through the control oil circuit 5, thereby controlling the main pressure regulating valve core 12 to reciprocate within the main pressure regulating valve body 11, thus placing the main pressure regulating valve in the neutral, open, or closed position. When the oil pressure in the upper control chamber 117 is greater than the oil pressure in the lower constant pressure chamber 118, the main pressure regulating valve body 11 moves downward to the neutral or open position. When the oil pressure in the lower constant pressure chamber 118 is greater than the oil pressure in the upper control chamber 117, the main pressure regulating valve body 11 moves upward to the neutral or closed position.

[0045] In some alternative embodiments: see Figure 2 and Figure 3As shown, this application embodiment provides a non-invasive main pressure regulating valve travel measurement system. The linear motor 32 and the third displacement sensor 33 of this system are both connected to the controller 1. The controller 1 controls the linear motor 32 to drive the pilot valve 31 to switch between the neutral position, the on position, and the off position. The third displacement sensor 33 acquires the travel of the linear motor 32 to determine whether the pilot valve 31 is in the neutral position, the on position, or the off position.

[0046] The first displacement sensor 13, the second displacement sensor 23, and the third displacement sensor 33 are micrometer-level laser displacement sensors or fiber optic displacement sensors. The first displacement sensor 13, the second displacement sensor 23, and the third displacement sensor 33 have a measurement accuracy of not less than 10μm and an effective measurement range of not less than 20mm, so as to improve the measurement accuracy and the accuracy of the measurement results.

[0047] In some alternative embodiments: see Figure 2 and Figure 3 As shown, this application embodiment provides a non-invasive main pressure regulating valve apnea measurement system. The non-invasive main pressure regulating valve apnea measurement system also includes a unit volute (not shown in the figure). A guide vane 6 for adjusting the flow opening of the unit volute is rotatably connected inside the unit volute. The output end of the servo 20 is connected to the guide vane 6 to adjust the rotation angle of the guide vane 6.

[0048] The controller 1 is connected to a touch screen display (not shown in the figure). The touch screen display shows the command buttons for controlling the controller 1 (such as the power-on measurement button, the neutral position button, the power-off measurement button, the relay unlock button, etc.) to display the displacement speed of the relay 20 output by the controller 1, as well as the value of the first displacement sensor 13.

[0049] See Figure 2 and Figure 3 As shown, a second aspect of this application provides a non-invasive method for measuring the occlusion of a main pressure regulating valve. The method uses the non-invasive main pressure regulating valve occlusion measurement system described in any of the above embodiments. The method includes an open-side occlusion measurement step and a closed-side occlusion measurement step. The steps for measuring the open-side occlusion distance include: Step 101: Click the power-on measurement button on the touch screen display.

[0050] Step 102: Controller 1 determines that the upstream and downstream gates of the current generator set are closed, and the pressure in the generator casing is equal to the tailwater pressure. Controller 1 then issues a command to pull out the relay lock indicator.

[0051] Step 103: The controller 1 instructs the relay 20 to adjust the guide vane 6 to a preset opening degree (such as 50% opening degree) through the main pressure regulating valve 10, and controls the main pressure regulating valve 10 to return to the neutral position, and sets the value of the first displacement sensor 13 to zero.

[0052] Step 104: Measure the displacement value of the relay 20 using the second displacement sensor 23, and calculate the first displacement velocity of the relay 20.

[0053] Step 105: Controller 1 controls the main pressure regulating valve 10 to gradually move from the neutral position to the open position. Whenever the main pressure regulating valve core 12 of the main pressure regulating valve 10 moves a preset stroke (e.g., 0.01mm each time), the controller controls the main pressure regulating valve core 12 to remain for a preset time (e.g., 100 milliseconds).

[0054] Step 106: The controller 1 uses the second displacement sensor 23 to measure the displacement value of the relay 20 again in real time. The controller 1 calculates the second displacement speed of the relay 20 every preset time period (e.g., 20 milliseconds).

[0055] Step 107: When the second displacement speed is greater than the first displacement speed to the preset threshold, the displacement speed of the relay 20 exceeds the preset threshold, and the controller 1 obtains the value of the first displacement sensor 13, which is the opening side blockage of the main pressure regulating valve 10.

[0056] Step 108: Controller 1 uses the main pressure regulating valve 10 to instruct the relay 20 to adjust the guide vane 6 to return to the preset opening degree (e.g., 50% opening degree).

[0057] The steps for measuring the occlusion distance on the closed side include: Step 201: Click the power off measurement button on the touch screen display.

[0058] Step 202: Controller 1 determines that the upstream and downstream valves of the current generator set are closed, and the pressure in the generator casing is equal to the tailwater pressure. Controller 1 then issues a command to pull out the relay lock indicator.

[0059] Step 203: The controller 1 instructs the relay 20 to adjust the guide vane 6 to a preset opening degree (such as 50% opening degree) through the main pressure regulating valve 10, and controls the main pressure regulating valve 10 to return to the neutral position, and sets the value of the first displacement sensor 13 to zero.

[0060] Step 204: Measure the displacement value of the relay 20 using the second displacement sensor 23, and calculate the first displacement velocity of the relay 20.

[0061] Step 205: Controller 1 controls the main pressure regulating valve 10 to move gradually from the neutral position to the off position. Whenever the main pressure regulating valve core 12 of the main pressure regulating valve 10 moves a preset stroke (e.g., 0.01mm each time), the controller controls the main pressure regulating valve core 12 to remain for a preset time (e.g., 100 milliseconds).

[0062] Step 206: The controller 1 uses the second displacement sensor 23 to measure the displacement value of the relay 20 again in real time. The controller 1 calculates the second displacement speed of the relay 20 every preset time period (e.g., 20 milliseconds).

[0063] Step 207: When the second displacement speed is greater than the first displacement speed to the preset threshold, the displacement speed of the relay 20 exceeds the preset threshold, and the controller 1 obtains the value of the first displacement sensor 13, which is the closing side of the main pressure regulating valve 10.

[0064] Step 208: Controller 1 uses the main pressure regulating valve 10 to instruct the relay 20 to adjust the guide vane 6 to restore it to the preset opening degree (e.g., 50% opening degree).

[0065] Working principle This application provides a non-invasive main pressure regulating valve travel measurement system and method. The non-invasive main pressure regulating valve travel measurement system includes a main pressure regulating valve 10, which comprises a valve body 11, a valve core 12 slidably connected within the valve body 11, and a first displacement sensor 13 for measuring the travel of the valve core 12; a relay 20, which includes a relay housing 21, a piston rod 22 slidably connected within the housing 21, and a second displacement sensor 23 for measuring the travel of the piston rod 22; and a controller 1, which controls the main pressure regulating valve 10 to switch from a neutral position to an open or closed position, and calculates the displacement speed of the relay 20 based on the measurement value of the second displacement sensor 23. When the displacement speed exceeds a preset threshold, the value of the first displacement sensor 13 is obtained as the open-side travel or the closed-side travel.

[0066] Therefore, the non-invasive main pressure regulating valve travel measurement system of this application has a first displacement sensor 13 on the main pressure regulating valve 10 to measure the travel of the valve core 12, and a second displacement sensor 23 on the servo actuator 20 to measure the travel of the piston rod 22. The main pressure regulating valve 10 has three states: neutral, open, and closed. When the main pressure regulating valve 10 is in the neutral position, the displacement speed of the servo actuator 20 is small. When the main pressure regulating valve 10 is in the open or closed position, the displacement speed of the servo actuator 20 is significantly larger than that in the neutral position. When the controller 1 controls the main pressure regulating valve 10 to gradually switch from the neutral position to the open or closed position, and calculates the displacement speed of the servo actuator 20 based on the measurement value of the second displacement sensor 23, when the displacement speed exceeds a preset threshold, the value of the first displacement sensor 13 is obtained as the open-side travel or closed-side travel. This avoids disassembling the main pressure regulating valve 10 for travel measurement, greatly improving work efficiency.

[0067] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0068] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A non-invasive main pressure regulating valve offset measurement system, characterized in that, include: The main pressure regulating valve (10) includes a main pressure regulating valve body (11), a main pressure regulating valve core (12) is slidably connected inside the main pressure regulating valve body (11), and a first displacement sensor (13) for measuring the stroke of the main pressure regulating valve core (12). The relay (20) includes a relay housing (21), a relay piston rod (22) is slidably connected inside the relay housing (21), and a second displacement sensor (23) for measuring the stroke of the relay piston rod (22). The controller (1) controls the main pressure valve (10) to switch from the neutral position to the open or closed position, and calculates the displacement speed of the relay (20) based on the measurement value of the second displacement sensor (23). When the displacement speed exceeds the preset threshold, the value of the first displacement sensor (13) is obtained as the open side blockage or the closed side blockage.

2. The non-invasive main pressure regulating valve offset measurement system as described in claim 1, characterized in that: The main pressure regulating valve body (11) is provided with a main oil inlet (111), an open side oil outlet (113) and a closed side oil outlet (112). The main oil inlet (111) is connected to a pressure oil source through a first pressure oil pipe (2). The first piston (24) is slidably connected inside the receiver housing (21). The first piston (24) is fixedly connected to the receiver piston rod (22). The first piston (24) divides the receiver housing (21) into an open side oil chamber (25) and a closed side oil chamber (26). The open-side oil outlet (113) is connected to the open-side oil chamber (25) through the second pressure oil pipe (4), and the closed-side oil outlet (112) is connected to the closed-side oil chamber (26) through the third pressure oil pipe (3).

3. The non-invasive main pressure regulating valve offset measurement system as described in claim 2, characterized in that: The main pressure regulating valve core (12) includes an opening piston (122) that opens or closes the opening side oil outlet (113), a closing piston (121) that opens or closes the closing side oil outlet (112), and a connecting rod (123) connecting the opening piston (122) and the closing piston (121). The diameters of the opening piston (122) and the closing piston (121) are larger than the diameter of the connecting rod (123), and the main oil inlet (111) is located on the periphery of the connecting rod (123).

4. The non-invasive main pressure regulating valve offset measurement system as described in claim 1, characterized in that: The main pressure regulating valve body (11) is provided with a valve cover (114) at the top. A valve stem (115) is slidably and sealed inside the valve cover (114). One end of the valve stem (115) extends into the main pressure regulating valve body (11) and is connected to the main pressure regulating valve core (12). One end of the valve stem (115) extending out of the main pressure regulating valve body (11) is connected to a valve core drive mechanism (30) that drives the main pressure regulating valve core (12) to switch from the neutral position to the open position or the closed position within the main pressure regulating valve body (11).

5. The non-invasive main pressure regulating valve offset measurement system as described in claim 4, characterized in that: A second piston (116) is fixedly connected to the valve stem (115) and slidably sealed to the valve cover (114). A closed upper control chamber (117) is formed between the second piston (116) and the valve cover (114). A closed lower constant pressure chamber (118) is formed between the bottom of the main pressure regulating valve core (12) and the main pressure regulating valve body (11). The valve core drive mechanism (30) includes a guide valve (31) that connects the upper control chamber (117) and the lower constant pressure chamber (118) through a control oil circuit (5). The guide valve (31) is connected to a linear motor (32) that drives its state transition. A third displacement sensor (33) that measures its stroke is connected to the linear motor (32).

6. The non-invasive main pressure regulating valve offset measurement system as described in claim 5, characterized in that: The linear motor (32) and the third displacement sensor (33) are both connected to the controller (1). The controller (1) controls the linear motor (32) to drive the pilot valve (31) to switch back and forth between the neutral position, the power-on position and the power-off position. The third displacement sensor (33) obtains the stroke of the linear motor (32) to determine whether the pilot valve (31) is in the neutral position, the power-on position and the power-off position.

7. The non-invasive main pressure regulating valve offset measurement system as described in claim 5, characterized in that: The first displacement sensor (13), the second displacement sensor (23) and the third displacement sensor (33) are micron-level laser displacement sensors or fiber optic displacement sensors. The measurement accuracy of the first displacement sensor (13), the second displacement sensor (23) and the third displacement sensor (33) is not less than 10 μm and the effective measurement range is not less than 20 mm.

8. The non-invasive main pressure regulating valve offset measurement system as described in claim 1, characterized in that: It also includes a turbine casing, in which a guide vane (6) for adjusting the flow opening of the turbine casing is rotatably connected, and the output end of the relay (20) is connected to the guide vane (6) to adjust the rotation angle of the guide vane (6).

9. The non-invasive main pressure regulating valve offset measurement system as described in claim 1, characterized in that: The controller (1) is connected to a touch screen display, which displays instruction buttons for controlling the controller (1) to display the displacement speed of the relay (20) output by the controller (1) and the value of the first displacement sensor (13).

10. A non-invasive method for measuring the apex displacement of a main pressure regulating valve, characterized in that, The method uses the non-invasive main pressure regulating valve offset measurement system according to any one of claims 1 to 9, the method comprising: The controller (1) instructs the relay (20) to adjust the guide vane (6) to the preset opening degree through the main pressure regulating valve (10), and controls the main pressure regulating valve (10) to return to the neutral position, and sets the value of the first displacement sensor (13) to zero; The displacement value of the relay (20) is measured using the second displacement sensor (23), and the first displacement velocity of the relay (20) is calculated. The controller (1) controls the main pressure regulating valve (10) to gradually move from the neutral position to the open or closed position. Whenever the main pressure regulating valve core (12) of the main pressure regulating valve (10) moves a preset stroke, the controller controls the main pressure regulating valve core (12) to remain for a preset time. The controller (1) uses the second displacement sensor (23) to measure the displacement value of the relay (20) again in real time. The controller (1) calculates the second displacement speed of the relay (20) once every preset time period. When the second displacement speed is greater than the first displacement speed to a preset threshold, the controller (1) obtains the value of the first displacement sensor (13), which is the opening or closing distance of the main pressure regulating valve (10). The controller (1) instructs the relay (20) via the main pressure regulating valve (10) to adjust the guide vane (6) to restore it to the preset opening.

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