Method for checking yield spring stiffness coefficient of hydroelectric generator set governor

Abstract

A kind of water turbine generator set governor yield spring stiffness coefficient verification method, steps are as follows: S1: install half joint on the outer wall of yield mechanism;S2: connect horizontal lever with spring pull rod of yield mechanism;S3: erect lever connecting frame on horizontal lever, and wear inner support rod and outer support rod, then complete the assembly of inner support and outer support;S4: use force bolt to press inner support, weight sensor is used to measure pressure variation value F, when force bolt rotates, because the position of inner support is fixed, force bolt reverse force will drive outer support to move, outer support drives horizontal lever and spring pull rod of yield mechanism to move, displacement sensor is used to measure the displacement variation value of measured plate, so as to measure the displacement variation value X of spring pull rod;S5: use stiffness coefficient calculation formula K=F / X to calculate the stiffness coefficient of spring.The problems such as great difficulty in disassembling spring, spring may pop out and hurt people when disassembled due to original compression state in traditional method are solved.

Description

[0001] This invention is a divisional application of "Method for verifying the stiffness coefficient of the yield spring of the governor of a hydro-generator set" (application number: 2022100444083; application date: January 14, 2022). Technical Field

[0002] This invention belongs to the technical field of yield spring stiffness coefficient verification for governors of hydro-generator sets, and specifically relates to a method for verifying the yield spring stiffness coefficient of governors of hydro-generator sets. Background Technology

[0003] The governor of the hydroelectric generator unit in the hydropower station is a mechanical feedback governor. The feedback spring installed in the yielding mechanism is a crucial component of the governor's feedback. Its stiffness coefficient needs to be measured periodically to prevent fluctuations in the unit's active power load caused by excessive softness. Currently, the measurement method involves disassembling the spring and sending it to a specialized calibration bench for measurement.

[0004] This measurement method has the following drawbacks: 1. It is difficult to disassemble and assemble the spring. 2. When the spring is removed, it may pop out and cause injury because it was originally in a compressed state. 3. Sending the spring for inspection takes a long time, affecting the maintenance schedule. Summary of the Invention

[0005] In view of the technical problems existing in the background art, the method for verifying the stiffness coefficient of the yield spring of the hydro-generator speed governor provided by the present invention can measure the stiffness coefficient of the spring without disassembling the yielding mechanism and the feedback spring. It solves the problems of difficult disassembly and assembly of springs, the possibility of springs popping out and injuring people when they are removed due to the original compression state, and the long time for sending springs for inspection, which affects the maintenance period.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A method for verifying the yield spring stiffness coefficient of a hydro-generator speed governor employs a yield spring stiffness coefficient verification device. The device includes a yielding mechanism, a horizontal lever, a half-joint, an outer support, an inner support, a force-applying bolt, a displacement sensor, and a weight sensor. The outer support includes a lever connecting frame and an outer support rod; the inner support includes an inner support rod and a test plate. The verification method is as follows:

[0008] S1: Install the split joint on the outer wall of the yielding mechanism;

[0009] S2: Connect the horizontal lever to the spring rod of the yielding mechanism;

[0010] S3: Set up the lever connecting frame on the horizontal lever, and install the inner support rod and the outer support rod, and then complete the assembly of the inner support and the outer support.

[0011] S4: Apply pressure to the internal support using tightening bolts; a weight sensor is used to measure pressure fluctuations. When the tension bolt rotates, since the inner support is fixed, the reverse force of the tension bolt will drive the outer support to move. The outer support will then drive the horizontal lever and the spring rod of the yielding mechanism to move. The displacement sensor is used to measure the displacement change of the plate being measured, thereby measuring the displacement change of the spring rod. X;

[0012] S5: Calculate the stiffness coefficient using the formula K= F / X calculates the spring constant.

[0013] Preferably, the half joint is connected to the inner support, the outer support is connected to the horizontal lever, a displacement sensor and a force-applying bolt are installed on the outer support, and a weight sensor is provided between the inner support and the force-applying bolt.

[0014] The split joint is used to install on the outer wall of the yielding mechanism, and the horizontal lever is used to connect with the spring rod of the yielding mechanism;

[0015] The outer support includes a lever connecting frame, which is detachably connected to a horizontal lever. The lever connecting frame is connected to an outer support rod, and an outer support plate is provided at the bottom of the outer support rod. A force-applying bolt and a displacement sensor are provided on the outer support plate.

[0016] The inner support includes an inner support rod, the top of which is connected to a split joint, and the bottom of which is connected to an inner support plate. A weight sensor is installed between the inner support plate and the outer support plate. The weight sensor is located at the bottom of the inner support plate, and the force generated by the tension bolt is transmitted to the inner support plate through the weight sensor. A test plate is installed on the inner support plate, and a displacement sensor is used to monitor the displacement of the test plate.

[0017] Preferably, the force-applying bolt is threaded into the outer support plate; the lever connecting frame is provided with a through hole, through which the inner support rod passes.

[0018] Preferably, the lever connecting frame is a T-shaped frame, with both ends of the T-shaped frame used to hang on the horizontal lever.

[0019] Preferably, the horizontal lever comprises two parallel plates with a row of mounting holes on each plate.

[0020] This patent can achieve the following beneficial effects:

[0021] In existing technology, the feedback spring of the yielding mechanism in a hydro-generator speed governor is the core component of the governor's feedback mechanism. It maintains balance during lever adjustment through a certain compression preload. During unit operation, the phenomenon of active power overshoot caused by a soft feedback spring has occurred multiple times. Therefore, it is necessary to measure the spring stiffness coefficient (K value) to understand its current status and formulate a reasonable maintenance or replacement plan to prevent its small value from adversely affecting the unit. Previous testing methods involved disassembling the entire yielding mechanism and then taking the spring out for measurement on a calibration bench, which was a complex and labor-intensive process. To address these issues, this invention allows for the measurement of the spring stiffness coefficient without disassembling the yielding mechanism and feedback spring. This solves the problems of difficult spring disassembly and assembly, the risk of injury from the spring popping out due to its compressed state during removal, and the long time required for spring inspection, which affects maintenance schedules. In addition, this device is small, portable, and easy to install, greatly reducing the time required to measure the spring stiffness coefficient. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a three-dimensional structural diagram of a yield spring stiffness coefficient verification device according to the present invention;

[0024] Figure 2 This is a front view of a yield spring stiffness coefficient verification device according to the present invention;

[0025] Figure 3 This is a right view of a yield spring stiffness coefficient verification device according to the present invention;

[0026] Figure 4 This is a top view of a yield spring stiffness coefficient verification device according to the present invention.

[0027] In the diagram: 1. Yielding mechanism; 2. Horizontal lever; 3. Half joint; 4. Outer support; 4. Lever connecting frame; 41. Nut; 42. Outer support rod; 43. Outer support plate; 44. Inner support; 5. Inner support rod; 51. Inner support plate; 52. Test plate; 53. Force bolt; 6. Displacement sensor; 7. Weight sensor; 8. Detailed Implementation

[0028] Preferred solutions include Figures 1 to 4 As shown, a method for verifying the yield spring stiffness coefficient of a hydro-generator speed governor is provided. The method employs a yield spring stiffness coefficient verification device, which includes a half-joint 3, an inner support 5, and an outer support 4. The half-joint 3 is connected to the inner support 5, and the outer support 4 is connected to the horizontal lever 2. A displacement sensor 7 and a force-applying bolt 6 are installed on the outer support 4, and a weight sensor 8 is provided between the inner support 5 and the force-applying bolt 6.

[0029] In use, the half-joint 3 is installed on the outer wall of the yielding mechanism 1, and the horizontal lever 2 is connected to the spring rod of the yielding mechanism 1. The horizontal lever 2 consists of two parallel plates with a row of mounting holes. The two parallel plates can be fixed together by welding with connecting rods or by bolts, or they can be fixed without any connecting parts.

[0030] In this embodiment, the outer support 4 includes a lever connecting frame 41, which is detachably connected to the horizontal lever 2. The lever connecting frame 41 is connected to the outer support rod 43, and the bottom of the outer support rod 43 is provided with an outer support plate 44. The outer support plate 44 is provided with a tension bolt 6 and a displacement sensor 7. The displacement sensor 7 on the outer support plate 44 can be permanently fixed by a fastener, which can save installation time during use. The tension bolt 6 is threadedly engaged with the outer support plate 44, and the tension bolt 6 does not need to be completely removed from the outer support plate 44.

[0031] The lever connecting bracket 41 needs to be disassembled and installed each time it is used, so a T-shaped bracket is designed to hook onto the horizontal lever 2 for easy installation. The top of the outer support rod 43 has an external thread, which is connected to the external threaded nut 42. The outer support plate 44 is threadedly connected to the outer support rod 43.

[0032] The inner support 5 includes an inner support rod 51, the top of which is connected to the split joint 3, and the bottom of which is connected to the inner support plate 52. A weight sensor 8 is provided between the inner support plate 52 and the outer support plate 44. The weight sensor 8 is located at the bottom of the inner support plate 52, and the force generated by the tension bolt 6 is transmitted to the inner support plate 52 through the weight sensor 8. A test plate 53 is provided on the inner support plate 52, and a displacement sensor 7 is used to monitor the displacement of the test plate 53. To save operation time, the weight sensor 8 is permanently installed at the bottom of the inner support plate 52 by a fastener; the test plate 53 is welded to the inner support plate 52.

[0033] The lever connecting frame 41 has a through hole through which the inner support rod 51 passes. The lever connecting frame 41 is a T-shaped frame, with both ends used to hang on the horizontal lever 2. When the inner support rod 51 is fixed, the position of the T-shaped frame will not move, and the inner support rod 51 can act as a positioning rod to prevent the entire device from shifting.

[0034] The verification method for the yield spring stiffness coefficient of the governor of the hydro-generator unit includes the following steps:

[0035] S1: Install the half-joint 3 on the outer wall of the yielding mechanism 1;

[0036] S2: Connect the horizontal lever 2 to the spring rod of the yielding mechanism 1;

[0037] S3: Set up the lever connecting frame 41 on the horizontal lever 2, and install the inner support rod 51 and the outer support rod 43, and then complete the assembly of the inner bracket 5 and the outer bracket 4;

[0038] S4: Apply pressure to the inner bracket 5 using the tension bolt 6; the weight sensor 8 is used to measure the pressure fluctuation. When the tension bolt 6 rotates, since the inner bracket 5 is fixed, the reverse force of the tension bolt 6 will drive the outer bracket 4 to move. The outer bracket 4 will drive the horizontal lever 2 and the spring rod of the yielding mechanism 1 to move. The displacement sensor 7 is used to measure the displacement change of the measured plate 53, thereby measuring the displacement change of the spring rod. X;

[0039] S5: Calculate the stiffness coefficient using the formula K= F / X calculates the spring constant.

[0040] During the assembly process of the method for verifying the yield spring stiffness coefficient of the governor of a hydro-generator set, the installation method of the horizontal lever 2 varies slightly depending on its structure. For example, in steps S2-S3, if the horizontal lever 2 consists of two independent plates, the inner bracket 5 and the outer bracket 4 are installed and connected to the half-joint 3 before fixing the horizontal lever 2 to the spring rod of the yielding mechanism 1, which can reduce the installation difficulty.

[0041] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A method for verifying the stiffness coefficient of the yield spring in a hydro-generator speed governor, characterized in that: A yield spring stiffness coefficient verification device is adopted. The yield spring stiffness coefficient verification device includes a yielding mechanism (1), a horizontal lever (2), a half joint (3), an outer support (4), an inner support (5), a force-applying bolt (6), a displacement sensor (7), and a weight sensor (8). The outer support (4) includes a lever connecting frame (41) and an outer support rod (43); the inner support (5) includes an inner support rod (51) and a test plate (53); the half joint (3) is connected to the inner support (5), and the outer support (4) is connected to the horizontal lever (2). The displacement sensor (7) and the force-applying bolt (6) are installed on the outer support (4), and the weight sensor (8) is provided between the inner support (5) and the force-applying bolt (6). The half joint (3) is used to be installed on the outer wall of the yielding mechanism (1), and the horizontal lever (2) is used to connect with the spring rod of the yielding mechanism (1); The outer support (4) includes a lever connecting frame (41), which is detachably connected to the horizontal lever (2). The lever connecting frame (41) is connected to the outer support rod (43), and the bottom of the outer support rod (43) is provided with an outer support plate (44). The outer support plate (44) is provided with a force-applying bolt (6) and a displacement sensor (7). The inner support (5) includes an inner support rod (51), the top of which is connected to the half joint (3), and the bottom of which is connected to the inner support plate (52). A weight sensor (8) is provided between the inner support plate (52) and the outer support plate (44). The weight sensor (8) is located at the bottom of the inner support plate (52). The force generated by the tension bolt (6) is transmitted to the inner support plate (52) through the weight sensor (8). A test plate (53) is provided on the inner support plate (52), and a displacement sensor (7) is used to monitor the displacement of the test plate (53). The verification method is as follows: S1: Install the half joint (3) on the outer wall of the yielding mechanism (1); S2: Connect the horizontal lever (2) to the spring rod of the yielding mechanism (1); S3: Set up the lever connecting frame (41) on the horizontal lever (2), and install the inner support rod (51) and the outer support rod (43), and then complete the assembly of the inner bracket (5) and the outer bracket (4); S4: Apply pressure to the inner support (5) using the tension bolt (6), and use the weight sensor (8) to measure the pressure fluctuation. When the tension bolt (6) rotates, since the position of the inner bracket (5) is fixed, the reverse force of the tension bolt (6) will drive the outer bracket (4) to move. The outer bracket (4) will drive the horizontal lever (2) and the spring rod of the yielding mechanism (1) to move. The displacement sensor (7) is used to measure the displacement change value of the plate under test (53), thereby measuring the displacement change value of the spring rod. X; S5: Calculate the stiffness coefficient using the formula K= F / X calculates the spring constant.

2. The method for verifying the yield spring stiffness coefficient of a hydro-generator speed governor according to claim 1, characterized in that: The tension bolt (6) is threaded into the outer support plate (44); the lever connecting frame (41) is provided with a through hole, and the inner support rod (51) passes through the through hole.

3. The method for verifying the yield spring stiffness coefficient of the governor of a hydro-generator unit according to claim 1, characterized in that: The lever connecting frame (41) is a T-shaped frame, and the two ends of the T-shaped frame are used to hang on the horizontal lever (2).

4. The method for verifying the yield spring stiffness coefficient of the governor of a hydro-generator unit according to claim 1, characterized in that: The horizontal lever (2) includes two parallel plates with a row of mounting holes on them.

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