Water turbine main shaft sealing model test device

Abstract

The utility model discloses a water turbine main shaft seal model test device which comprises a rotating part and a fixed part. The rotating part comprises a main shaft and a dragging motor, the dragging motor and the main shaft are driven through a belt, and a rotating ring is arranged on the main shaft; the fixing component comprises a support, a base, a supporting ring, a water tank cover and a floating ring, and a sealing block is fixedly arranged on the floating ring. The rotating part, the base and the supporting ring form a muddy water cavity, and the rotating part, the supporting ring and the water tank cover form a clear water cavity. The test system integrates a first water tank and is internally provided with double water inlet pipes, one pipe directly reaches the contact surface of the sealing block through a water passing channel on the floating ring, and the other pipe is connected into a muddy water cavity. The scheme simulates the actual working environment of the water turbine main shaft seal, adapts to units with different rotating speeds, and is convenient to adjust the operating conditions so as to efficiently and accurately detect the sealing performance parameters.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine generators, in particular to a water turbine main shaft sealing model test device. Background Art

[0002] As one of the core equipment of a hydropower station, the safe and stable operation of a turbine plays a vital role in ensuring power supply. Among them, the turbine main shaft sealing system is a key component to ensure efficient and safe operation of the unit. Its main function is to effectively prevent high-pressure water from leaking from the tiny gap between the main shaft and the top cover or protective cover, avoiding energy loss and equipment damage, and protecting the safety of the power plant structure.

[0003] With the advancement of technology, new sealing technologies such as magnetic fluid seals have shown the potential to reduce wear, extend service life and improve sealing reliability due to their non-contact working principle. The application and optimized design of these new sealing technologies are highly dependent on precise testing and verification, especially the evaluation of their sealing performance, durability and adaptability to various operating conditions under actual working conditions.

[0004] Therefore, developing a test device that can comprehensively and efficiently evaluate the performance and predict the life of the turbine main shaft seal is of great significance for promoting the innovation of sealing technology and improving the operating efficiency and safety of hydropower stations. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a turbine main shaft seal model test device, which can simulate the real operating environment of the turbine main shaft, adjust the operating conditions according to different unit speeds, explore the main shaft seal operating performance under different working conditions, and quickly and accurately obtain the sealing state parameters.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a turbine main shaft seal model test device, comprising a fixed component and a rotating component, wherein the rotating component comprises a main shaft and a rotating ring fixedly connected to the main shaft;

[0007] The fixed component includes a bracket, a base is provided on the bracket, the main shaft is movably arranged on the base and is driven by a drag motor fixedly arranged on the bracket and a transmission belt, and the fixed component also includes a support ring fixedly arranged on the bracket, a floating ring is provided on the support ring, a sealing block is provided on the floating ring, and a contact surface is formed between the bottom surface of the sealing block and the top surface of the rotating ring;

[0008] A water tank cover is provided on the top of the support ring;

[0009] The bracket, the support ring and the rotating component form a muddy water chamber, and the support ring, the water tank cover and the rotating component form a clear water chamber;

[0010] The device also includes a first water tank, in which a first water inlet pipe and a second water inlet pipe are arranged, a water passage is arranged on the floating ring, the water passage extends to the contact surface between the sealing block and the floating ring, the first water inlet pipe is connected to the water passage on the floating ring, and the second water inlet pipe is connected to the muddy water chamber.

[0011] In a preferred solution, the fixing component includes a supporting ring located in the housing, the floating ring is movably arranged on the supporting ring and can move in the vertical direction, the supporting ring is provided with a spring, and both ends of the spring are respectively connected to the supporting ring and the floating ring.

[0012] In a preferred solution, the first water inlet pipe is provided with a first water supply pump and a first manual control valve, and the second water inlet pipe is provided with a second water supply pump and a second manual control valve.

[0013] In a preferred solution, an overflow water tank is provided on one side of the bracket, and an overflow drain pipe connected to the clean water chamber is provided on the shell.

[0014] In a preferred solution, a displacement sensor is provided on the bracket at the lower end of the main shaft, and the displacement sensor is used to monitor the displacement of the lower end of the main shaft in the horizontal direction.

[0015] In a preferred embodiment, a sand throwing hole is provided on the side wall of the muddy water chamber.

[0016] In a preferred solution, a temperature sensor is also provided on the sealing block, and the temperature sensor is used to monitor the temperature of the contact surface between the sealing block and the rotating ring.

[0017] In a preferred solution, a speed sensor is provided at the upper end of the main shaft, and the speed sensor is used to monitor the rotation speed of the main shaft.

[0018] The utility model provides a turbine main shaft seal model test device, which has the following beneficial effects by adopting the above structure:

[0019] (1) The device can accurately simulate various operating conditions of the actual operation of the turbine, including different water pressures, rotation speeds and temperature changes, thereby reproducing the complex and changeable field environment in the laboratory, ensuring that the test results are close to the actual situation and improving the reliability of the sealing performance evaluation;

[0020] (2) It provides an efficient verification platform for new sealing materials and technologies. Researchers can use the device to quickly iterate designs, evaluate the performance of different sealing solutions, accelerate the R&D cycle of new technologies, and promote the advancement of turbine sealing technology.

[0021] (3) By precisely controlling the test conditions, the energy loss assessment error caused by seal failure is reduced, which helps to design a more efficient sealing structure. In the long run, it can significantly reduce the energy consumption of hydropower stations and meet the needs of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0023] FIG1 is a schematic diagram of the overall structure of the utility model.

[0024] Figure 2 is a schematic diagram of the main structure of the device.

[0025] FIG3 is an enlarged view of point A in FIG2 of the present invention.

[0026] FIG4 is an enlarged view of point B in FIG2 of the present invention.

[0027] In the figure: bracket 1, main shaft 2, drag motor 3, rotating ring 4, sealing block 5, floating ring 6, first water tank 7, first water inlet pipe 8, first water supply pump 9, water passage 10, support ring 11, spring 12, muddy water chamber 13, clean water chamber 14, overflow drain pipe 15, overflow water tank 16, second water inlet pipe 17, second water supply pump 18, first manual control valve 19, second manual control valve 20, displacement sensor 21, sand throwing hole 22, temperature sensor 23, speed sensor 24, drain pipe 25, second water tank 26, water tank cover 27, base 28. DETAILED DESCRIPTION

[0028] As shown in Fig. 1-4, a turbine main shaft seal model test device includes a fixed component and a rotating component, wherein the rotating component includes a main shaft 2 and a rotating ring 4 fixedly connected to the main shaft 2;

[0029] The fixed component includes a bracket 1, on which a base 28 is provided, and the main shaft 2 is movably arranged on the base 28 and is driven by a traction motor 3 fixedly arranged on the bracket 1 in cooperation with a transmission belt. The fixed component also includes a support ring 11 fixedly arranged on the bracket 1, on which a floating ring 6 is provided, and on which a sealing block 5 is provided, and a contact surface is formed between the bottom surface of the sealing block 5 and the top surface of the rotating ring 4;

[0030] A water tank cover 27 is provided on the top of the support ring 11;

[0031] The support 1, the support ring 11 and the rotating component form a muddy water chamber 13, and the support ring 11, the water tank cover 27 and the rotating component form a clean water chamber 14;

[0032] The device also includes a first water tank 7, in which a first water inlet pipe 8 and a second water inlet pipe 17 are provided, a water passage 10 is provided on the floating ring 6, and the water passage 10 extends to the contact surface between the sealing block 5 and the floating ring 6, the first water inlet pipe 8 is connected to the water passage 10 on the floating ring 6, and the second water inlet pipe 17 is connected to the muddy water chamber 13.

[0033] In a preferred solution, the fixing component includes a support ring 11 located in the housing, the floating ring 6 is movably arranged on the support ring 11 and can move in the vertical direction, the support ring 11 is provided with a spring 12, and both ends of the spring 12 are connected to the support ring 11 and the floating ring 6 respectively.

[0034] In a preferred solution, the first water inlet pipe 8 is provided with a first water supply pump 9 and a first manual control valve 19 , and the second water inlet pipe 17 is provided with a second water supply pump 18 and a second manual control valve 20 .

[0035] In a preferred solution, an overflow water tank 16 is provided on one side of the bracket 1, and an overflow drain pipe 15 connected to the clean water chamber 14 is provided on the shell.

[0036] In a preferred solution, the overflow water tank 16 is provided with a drain pipe 25 extending to the second water tank 26 .

[0037] In a preferred solution, a displacement sensor 21 is provided on the bracket 1 at the lower end of the main shaft 2, and the displacement sensor 21 is used to monitor the displacement of the lower end of the main shaft 2 in the horizontal direction.

[0038] In a preferred embodiment, a sand injection hole 22 is provided on the side wall of the muddy water chamber 13 .

[0039] In a preferred solution, a temperature sensor 23 is further provided on the sealing block 5 , and the temperature sensor 23 is used to monitor the temperature of the contact surface between the sealing block 5 and the rotating ring 4 .

[0040] In a preferred solution, a speed sensor 24 is provided at the upper end of the main shaft 2 , and the speed sensor 24 is used to monitor the rotation speed of the main shaft 2 .

[0041] The present invention discloses a hydraulic turbine main shaft seal model test device, as shown in FIG1 , when simulating the operation state of the hydraulic turbine main shaft:

[0042] By starting the first water supply pump 9 on the first water inlet pipe 8 and the second water supply pump 18 on the second water inlet pipe 17, the water in the first water tank 7 is pumped into the muddy water chamber 13 and the clean water chamber 14, and at the same time, sand and gravel are added into the muddy water chamber 13 through the sand injection hole 22 to form muddy water. The water flows along the first water inlet pipe 8 into the water passage 10 on the floating ring 6, and flows out from the gap between the sealing block 5 and the rotating ring 4, forming a water grinding seal in the gap between the rotating ring 4 and the sealing block 5, and part of the water flows into the muddy water chamber 13, suppressing the simulated river water in the muddy water chamber 13 to prevent the muddy water from entering the friction surface. Another part of the water flows into the clean water chamber 14 through the gap between the floating ring 6 and the main shaft 2 to prevent muddy water from flowing upward. The excess clean water flows into the overflow tank 16 through the overflow drain pipe 15. The overflow water volume is monitored by the scale on the overflow tank 16.

[0043] In the above process, by controlling the first manual control valve 19 and the second manual control valve 20, the water intake of the device can be reduced, so that dry friction is formed between the rotating ring 4 and the sealing block 5. In the dry friction state, the horizontal displacement of the main shaft 2, the temperature change caused by the dry friction between the rotating ring 4 and the sealing block 5, and the change in the rotation speed of the main shaft 2 are monitored by the displacement sensor 21, the temperature sensor 23 and the speed sensor 24 respectively.

[0044] At the same time, by adjusting the speed of the drag motor 3, different speed controls of the spindle 2 can be achieved, thereby simulating the real operating environment of different models of spindles 2.

[0045] The data obtained during the above tests can be used to evaluate the performance of different sealing solutions, accelerate the research and development cycle of new technologies, and promote the advancement of turbine sealing technology.

Claims

1. A turbine main shaft seal model test device, comprising a fixed component and a rotating component, characterized in that: The rotating component comprises a main shaft (2) and a rotating ring (4) fixedly connected to the main shaft (2); The fixed component comprises a bracket (1), a base (28) is provided on the bracket (1), a main shaft (2) is movably arranged on the base (28) and is driven by a traction motor (3) fixedly arranged on the bracket (1) in cooperation with a transmission belt, and the fixed component also comprises a support ring (11) fixedly arranged on the bracket (1), a floating ring (6) is provided on the support ring (11), a sealing block (5) is provided on the floating ring (6), and a contact surface is formed between the bottom surface of the sealing block (5) and the top surface of the rotating ring (4); A water tank cover (27) is provided on the top of the support ring (11); The support (1), the support ring (11) and the rotating component form a muddy water chamber (13), and the support ring (11), the water tank cover (27) and the rotating component form a clear water chamber (14); The device further comprises a first water tank (7), wherein a first water inlet pipe (8) and a second water inlet pipe (17) are provided in the first water tank (7), a water passage (10) is provided on the floating ring (6), the water passage (10) extends to the contact surface between the sealing block (5) and the floating ring (6), the first water inlet pipe (8) is connected to the water passage (10) on the floating ring (6), and the second water inlet pipe (17) is connected to the muddy water chamber (13).

2. A turbine main shaft seal model test device according to claim 1, characterized in that: The fixing component comprises a support ring (11) located inside the housing, the floating ring (6) being movably arranged on the support ring (11) and being movable in the vertical direction, the support ring (11) being provided with a spring (12), the two ends of the spring (12) being respectively connected to the support ring (11) and the floating ring (6).

3. A turbine main shaft seal model test device according to claim 1, characterized in that: The first water inlet pipe (8) is provided with a first water supply pump (9) and a first manual control valve (19), and the second water inlet pipe (17) is provided with a second water supply pump (18) and a second manual control valve (20).

4. A turbine main shaft seal model test device according to claim 1, characterized in that: An overflow water tank (16) is provided on one side of the bracket (1), and an overflow drain pipe (15) connected to the clean water chamber (14) is provided on the shell.

5. A turbine main shaft seal model test device according to claim 4, characterized in that: The overflow water tank (16) is provided with a drainage pipe (25) extending to the second water tank (26).

6. A turbine main shaft seal model test device according to claim 1, characterized in that: A displacement sensor (21) is provided on the bracket (1) at the lower end of the main shaft (2), and the displacement sensor (21) is used to monitor the displacement of the lower end of the main shaft (2) in the horizontal direction.

7. A turbine main shaft seal model test device according to claim 1, characterized in that: A sand injection hole (22) is provided on the side wall of the muddy water chamber (13).

8. The turbine main shaft seal model test device according to claim 1, characterized in that: The sealing block (5) is also provided with a temperature sensor (23), and the temperature sensor (23) is used to monitor the temperature of the contact surface between the sealing block (5) and the rotating ring (4).

9. A turbine main shaft seal model test device according to claim 1, characterized in that: A speed sensor (24) is provided at the upper end of the main shaft (2), and the speed sensor (24) is used to monitor the rotation speed of the main shaft (2).

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