A radial force measuring device for a hydraulic turbine model

Abstract

This invention discloses a radial force measuring device for a hydro-turbine model, belonging to the field of hydro-turbines. The device comprises an axial high-pressure oil chamber in the axial clearance between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve, and a radial high-pressure oil chamber in the radial clearance. These chambers provide non-contact force between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve. A main shaft is rotatably connected to the hydrostatic bearing swing sleeve, and its bottom end is fixedly connected to the turbine runner of the hydro-turbine model. A pressure detection unit is radially arranged, with its outer casing fixedly connected to the hydrostatic bearing outer sleeve, and its measuring end contacting the outer wall of the hydrostatic bearing swing sleeve. By utilizing the low friction and high sensitivity of the rigid hydraulic oil film formed between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve, the radial force acting on the turbine runner is directly transmitted to the pressure detection unit through the hydrostatic bearing swing sleeve, achieving accurate measurement of the radial force.

Description

Technical Field

[0001] This invention relates to the field of water turbine technology, and in particular to a radial force measuring device for a water turbine model. Background Technology

[0002] A hydroturbine is a power machine that converts the energy of flowing water into rotational mechanical energy. It belongs to the category of turbine machinery in fluid machinery and is mainly installed in hydroelectric power stations to drive generators to produce electricity. In a hydroelectric power station, water from the upstream reservoir is drawn to the hydroturbine through a water intake pipe, which drives the turbine runner to rotate, thereby driving the generator to produce electricity. The water that has done its work is then discharged downstream through the tailrace pipe.

[0003] The radial force of a hydro turbine is the primary load acting on the main shaft and guide bearings, directly affecting bearing life and operational safety. It is also one of the main sources of vibration in the unit and can affect component seals and clearances. Therefore, the radial force of a hydro turbine is directly related to the safe operation, service life, and operational stability of the unit.

[0004] The mainstream methods for measuring the radial force of a turbine model in the existing technology mainly include the following two: The first is the differential pressure method, which measures the change of oil pressure in the radial bearing of the rotating component through an oil pressure measuring device, and then calculates the radial force of the main shaft acting on the rotating component through a data acquisition system; The second is the load identification method, which measures the pressure at the guide bearing through a guide bearing pressure sensor, and then identifies the radial force on the runner.

[0005] Both the differential pressure method and the load identification method are indirect measurements. Their accuracy is affected by multiple factors such as bearing characteristics and model simplification, making it difficult to directly and accurately capture the radial water thrust on the runner.

[0006] Therefore, it is urgent to design a radial force measuring device for a water turbine model to solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to provide a radial force measuring device for a water turbine model, which can achieve accurate measurement of radial force.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A radial force measuring device for a water turbine model, comprising: The hydrostatic bearing outer sleeve is fixed in place. A hydrostatic bearing swing sleeve is disposed inside the hydrostatic bearing outer sleeve, and the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve are clearance-fitted in both the axial and radial directions; an axial high-pressure oil cavity is provided in the axial clearance between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve, and a radial high-pressure oil cavity is provided in the radial clearance between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve, the axial high-pressure oil cavity and the radial high-pressure oil cavity providing non-contact force between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve; The main shaft is rotatably connected to the hydrostatic bearing swing sleeve, and the bottom end of the main shaft is fixedly connected to the runner of the water turbine model; and, A pressure detection unit is provided, which is arranged along the radial direction. The outer shell of the pressure detection unit is fixedly connected to the outer sleeve of the hydrostatic bearing, and the measuring end of the pressure detection unit is in contact with the outer wall of the swing sleeve of the hydrostatic bearing.

[0009] As an optional technical solution for the radial force measuring device of the above-mentioned turbine model, a plurality of radial high-pressure oil chambers are provided in the radial gap along the axial direction of the turbine model. When there are at least two radial high-pressure oil chambers, all the radial high-pressure oil chambers are distributed at intervals along the axial direction, and all the radial high-pressure oil chambers are uniform.

[0010] As an optional technical solution for the radial force measuring device of the above-mentioned turbine model, at least two axial high-pressure oil chambers are provided in the axial gap along the circumferential direction of the turbine model. All the axial high-pressure oil chambers are distributed at intervals along the circumferential direction, and all the axial high-pressure oil chambers are uniform.

[0011] As an optional technical solution for the radial force measuring device of the above-mentioned turbine model, at least two pressure detection units are provided, and all pressure detection units are spaced apart in the circumferential direction.

[0012] As an optional technical solution for the radial force measuring device of the aforementioned turbine model, all the pressure detection units are set in the same horizontal plane.

[0013] As an optional technical solution for the radial force measuring device of the aforementioned turbine model, all the pressure detection units are arranged at equal intervals in the same horizontal plane.

[0014] As an optional technical solution for the radial force measuring device of the aforementioned turbine model, at least two pressure detection units are respectively arranged in the X and Y directions of the same horizontal plane, wherein the X and Y directions are perpendicular to each other.

[0015] As an optional technical solution for the radial force measuring device of the above-mentioned turbine model, the upper end of the main shaft is connected to the hydrostatic bearing swing sleeve through the first bearing, and the lower end of the main shaft is connected to the hydrostatic bearing swing sleeve through the second bearing.

[0016] As an optional technical solution for the aforementioned radial force measuring device for the turbine model, the radial force measuring device for the turbine model further includes: An oil supply system, wherein the oil outlet of the oil supply system is connected to the axial high-pressure oil chamber and the radial high-pressure oil chamber respectively.

[0017] As an optional technical solution for the radial force measuring device of the above-mentioned turbine model, the main shaft is installed on the upper part of the runner of the turbine model, and the hydrostatic bearing is sleeved on the top cover of the turbine model.

[0018] Compared with the prior art, the present invention has at least the following technical effects: The radial force measuring device for a turbine model disclosed in this invention includes a hydrostatic bearing outer sleeve, a hydrostatic bearing swing sleeve, a main shaft, and a pressure detection unit. The hydrostatic bearing outer sleeve is fixed. The hydrostatic bearing swing sleeve is disposed inside the hydrostatic bearing outer sleeve, and the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve are clearance-fitted in both the axial and radial directions. An axial high-pressure oil chamber is provided in the axial clearance between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve, and a radial high-pressure oil chamber is provided in the radial clearance between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve. The axial high-pressure oil chamber and the radial high-pressure oil chamber provide non-contact force between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve. One end of the main shaft is rotatably connected to the hydrostatic bearing swing sleeve, and the other end is fixedly connected to the turbine runner of the turbine model. The pressure detection unit is arranged radially, and the outer shell of the pressure detection unit is fixedly connected to the hydrostatic bearing outer sleeve. The measuring end of the pressure detection unit is in contact with the outer wall of the hydrostatic bearing swing sleeve.

[0019] The radial force measuring device for this turbine model injects high-pressure oil into the high-pressure oil chamber between the hydrostatic bearing swing sleeve and the hydrostatic bearing outer sleeve, thereby forming a high-pressure oil film. The high-pressure oil film has low friction and high sensitivity, which keeps the hydrostatic bearing swing sleeve in a highly sensitive state. Thus, the radial force acting on the turbine model's runner is directly transmitted to the pressure detection unit through the hydrostatic bearing swing sleeve connected to the main shaft, achieving accurate measurement of the radial force. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the radial force measuring device for a water turbine model provided in a specific embodiment of the present invention.

[0022] In the picture: 10. Hydrostatic bearing outer sleeve; 20. Hydrostatic bearing swing sleeve; 21. Axial high-pressure oil chamber; 22. Radial high-pressure oil chamber; 30. Spindle; 31. First bearing; 32. Second bearing; 40. Pressure detection unit; 50. Oil inlet pipe; 60. Oil return pipe; 100. Rotary wheel. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] This embodiment discloses a radial force measuring device for a water turbine model, such as... Figure 1As shown, the radial force measuring device for the turbine model includes a hydrostatic bearing outer sleeve 10, a hydrostatic bearing swing sleeve 20, a main shaft 30, and a pressure detection unit 40. The hydrostatic bearing outer sleeve 10 is fixed. The hydrostatic bearing swing sleeve 20 is disposed inside the hydrostatic bearing outer sleeve 10, and the hydrostatic bearing swing sleeve 20 and the hydrostatic bearing outer sleeve 10 are clearance-fitted in both the axial and radial directions. An axial high-pressure oil chamber 21 is provided in the axial clearance between the hydrostatic bearing swing sleeve 20 and the hydrostatic bearing outer sleeve 10, and a radial high-pressure oil chamber is provided in the radial clearance between the hydrostatic bearing swing sleeve 20 and the hydrostatic bearing outer sleeve 10. Cavity 22, axial high-pressure oil cavity 21, and radial high-pressure oil cavity 22 are all rigid hydraulic oil cavities. Axial high-pressure oil cavity 21 and radial high-pressure oil cavity 22 provide non-contact force between the hydrostatic bearing swing sleeve 20 and the hydrostatic bearing outer sleeve 10. One end of the main shaft 30 is rotatably connected to the hydrostatic bearing swing sleeve 20, and the other end is fixedly connected to the turbine runner 100 of the turbine model. The pressure detection unit 40 is arranged radially, with its outer shell fixedly connected to the hydrostatic bearing outer sleeve 10. The measuring end of the pressure detection unit 40 makes gentle contact with the outer wall of the hydrostatic bearing swing sleeve 20. The direct contact between the measuring end of the pressure detection unit 40 and the outer wall of the hydrostatic bearing swing sleeve 20 directly transmits radial force, effectively improving measurement accuracy.

[0030] The radial force measuring device for this turbine model forms an axial high-pressure oil film by injecting high-pressure oil into the axial high-pressure oil chamber 21 between the hydrostatic bearing swing sleeve 20 and the hydrostatic bearing outer sleeve 10, and a radial high-pressure oil film by injecting high-pressure oil into the radial high-pressure oil chamber 22. The high-pressure oil films have low friction and high sensitivity, ensuring that the hydrostatic bearing swing sleeve 20 is always in a highly sensitive state. This allows the radial force acting on the turbine runner 100 to be directly transmitted to the pressure detection unit 40 through the hydrostatic bearing swing sleeve 20 connected to the main shaft 30, achieving accurate measurement of the radial force. Due to the presence of the axial high-pressure oil chamber 21 and the radial high-pressure oil chamber 22, the hydrostatic bearing swing sleeve 20 does not contact the hydrostatic bearing outer sleeve 10 and remains in a suspended, highly sensitive state. Therefore, the radial force transmission is more accurate, and the measurement results are highly precise.

[0031] In this embodiment, the turbine runner 100 of the turbine model is installed at the lower part of the main shaft 30, meaning the radial force measuring device of the entire turbine model is located above the turbine model. Optionally, the hydrostatic bearing sleeve 10 is installed on the unit top cover of the turbine model to fix the measuring device to the turbine model.

[0032] Furthermore, the upper end of the main shaft 30 is connected to the hydrostatic bearing swing sleeve 20 via the first bearing 31, and the lower end of the main shaft 30 is connected to the hydrostatic bearing swing sleeve 20 via the second bearing 32. The main shaft 30 is integrated with the hydrostatic bearing swing sleeve 20 via the two bearings. Optionally, both the first bearing 31 and the second bearing 32 are ball bearings. Ball bearings have low frictional resistance, high precision, and smooth operation.

[0033] In this embodiment, the radial force measuring device for the turbine model also includes an oil supply system, the oil outlet of which is connected to the axial high-pressure oil chamber 21 and the radial high-pressure oil chamber 22, respectively. By setting up the oil supply system, high-pressure oil is supplied to the axial high-pressure oil chamber 21 to form an axial high-pressure oil film, and high-pressure oil is supplied to the radial high-pressure oil chamber 22 to form a radial high-pressure oil film, so that the hydrostatic bearing swing sleeve 20 is always in a highly sensitive state, which can transmit radial pressure more accurately and improve detection accuracy.

[0034] Optionally, the oil supply system includes an oil tank and an oil inlet pipe 50. The oil tank contains high-pressure oil, and the oil tank is connected to the axial clearance and the radial clearance respectively through the oil inlet pipe 50.

[0035] Furthermore, the bottom of the second bearing 32 is provided with an oil return chamber. After the high-pressure oil supplied by the oil supply system enters the axial clearance and radial clearance, it flows by gravity into the oil return chamber and is then discharged into the oil tank of the oil supply system through the oil return pipe 60 for recycling, thus saving resources.

[0036] In this embodiment, at least two pressure detection units 40 are provided, and all pressure detection units 40 are spaced apart in the circumferential direction. By setting at least two pressure detection units 40, multi-point simultaneous detection can be achieved, which can automatically eliminate the influence of eccentricity, installation errors, and shaft wobble, making the measurement more stable and accurate. At the same time, multiple pressure detection units 40 can collect data simultaneously, which can track changes in load direction in real time, making it suitable for dynamic monitoring and more suitable for rotating conditions. In addition, multiple pressure detection units 40 can cross-check each other, and can continue to work even if some abnormalities occur, improving reliability.

[0037] Furthermore, all pressure detection units 40 are positioned on the same horizontal plane. Positioning all pressure detection units 40 on the same horizontal plane eliminates axial force interference, facilitates vector synthesis, accurately calculates the magnitude of radial force, improves the measurement accuracy of radial force, and simplifies installation and positioning while ensuring good consistency.

[0038] Furthermore, all pressure sensing units 40 are evenly spaced and arranged on the same horizontal plane. This structural arrangement further improves measurement accuracy.

[0039] Furthermore, at least two pressure detection units 40 are respectively arranged in the X and Y directions of the same horizontal plane, with the X and Y directions being perpendicular to each other. By arranging one pressure detection unit 40 in each of the two perpendicular directions, complete radial force measurement can be achieved with a minimum number of pressure detection units 40, resulting in high accuracy, anti-interference, directional measurement capability, and suitability for rotational conditions.

[0040] Furthermore, in this embodiment, four pressure detection units 40 are provided. The four pressure detection units 40 are arranged at 90° intervals along the circumferential direction in the same horizontal plane. That is, two pressure detection units 40 are arranged along the X direction and spaced 180° apart, and the other two pressure detection units 40 are arranged along the Y direction and spaced 180° apart.

[0041] In this embodiment, the pressure detection unit 40 is installed at the lower part of the hydrostatic bearing outer sleeve 10, that is, at one end close to the turbine model, which is closer to the power source and can improve the accuracy of radial force detection.

[0042] Optionally, the pressure detection unit 40 in this embodiment is a high-precision pressure sensor.

[0043] In this embodiment, a plurality of radial high-pressure oil chambers 22 are provided in the radial clearance along the axial direction of the turbine model. When there are at least two radial high-pressure oil chambers 22, all radial high-pressure oil chambers 22 are distributed at intervals along the axial direction, and all radial high-pressure oil chambers 22 are uniform. One, two, or more radial high-pressure oil chambers 22 can be provided, all of which can keep the hydrostatic bearing swing sleeve 20 in a highly sensitive state. When there are two or more radial high-pressure oil chambers 22, the effect is better, and the radial high-pressure oil chambers 22 are uniform in all places, which is beneficial to improving the accuracy of the detection data. The clearance between the hydrostatic bearing outer sleeve 10 and the hydrostatic bearing swing sleeve 20 is controlled by precision machining to make the radial clearance uniform, thereby ensuring the uniformity of the radial high-pressure oil chambers 22, and thus ensuring that the radial direction of the hydrostatic bearing swing sleeve 20 is always in a highly sensitive state under the action of the radial high-pressure oil chambers 22.

[0044] Along the circumference of the turbine model, at least two axial high-pressure oil chambers 21 are provided in the axial clearance. All axial high-pressure oil chambers 21 are distributed at intervals along the circumference and are uniformly distributed. This uniformity of the axial high-pressure oil chambers 21 improves the accuracy of the detection data. The clearance of the hydrostatic bearing outer sleeve 10 and the hydrostatic bearing swing sleeve 20 is controlled by precision machining to ensure uniform axial clearance, thereby guaranteeing the uniformity of the axial high-pressure oil chambers 21. This ensures that the axial force of the hydrostatic bearing swing sleeve 20 remains highly sensitive under the action of the axial high-pressure oil chambers 21. Furthermore, all axial high-pressure oil chambers 21 are evenly distributed at intervals along the circumference. This structural design improves the symmetry and consistency of the hydrostatic bearing swing sleeve 20's posture, thus improving the detection accuracy of radial force.

[0045] Optionally, the radial high-pressure oil chamber 22 and the axial high-pressure oil chamber 21 are uniformly aligned. This structural arrangement can further improve the uniformity of radial force detection, thereby improving detection accuracy.

[0046] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

[0047] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A radial force measuring device for a hydraulic turbine model, characterized by include: The hydrostatic bearing outer sleeve (10) is fixed in place; A hydrostatic bearing swing sleeve (20) is disposed inside the hydrostatic bearing outer sleeve (10). The hydrostatic bearing swing sleeve (20) and the hydrostatic bearing outer sleeve (10) are clearance-fitted in both the axial and radial directions. An axial high-pressure oil chamber (21) is provided in the axial clearance between the hydrostatic bearing swing sleeve (20) and the hydrostatic bearing outer sleeve (10), and a radial high-pressure oil chamber (22) is provided in the radial clearance between the hydrostatic bearing swing sleeve (20) and the hydrostatic bearing outer sleeve (10). The axial high-pressure oil chamber (21) and the radial high-pressure oil chamber (22) provide non-contact force between the hydrostatic bearing swing sleeve (20) and the hydrostatic bearing outer sleeve (10). A main shaft (30) is rotatably connected to the hydrostatic bearing swing sleeve (20), and the bottom end of the main shaft (30) is fixedly connected to the runner (100) of the turbine model; and, Pressure detection unit (40) is arranged along the radial direction. The outer shell of the pressure detection unit (40) is fixedly connected to the outer sleeve (10) of the hydrostatic bearing. The measuring end of the pressure detection unit (40) is in contact with the outer wall of the hydrostatic bearing swing sleeve (20).

2. The radial force measuring device for a turbine model according to claim 1, characterized in that, Along the axial direction of the turbine model, a plurality of radial high-pressure oil chambers (22) are provided in the radial gap. When there are at least two radial high-pressure oil chambers (22), all the radial high-pressure oil chambers (22) are distributed at intervals along the axial direction, and all the radial high-pressure oil chambers (22) are uniform.

3. The radial force measuring device for a turbine model according to claim 1, characterized in that, Along the circumferential direction of the turbine model, at least two axial high-pressure oil chambers (21) are provided in the axial gap. All the axial high-pressure oil chambers (21) are distributed at intervals along the circumferential direction, and all the axial high-pressure oil chambers (21) are uniform.

4. The radial force measuring device for a turbine model according to claim 1, characterized in that, At least two pressure detection units (40) are provided, and all pressure detection units (40) are spaced apart in the circumferential direction.

5. The radial force measuring device for a turbine model according to claim 4, characterized in that, All of the pressure detection units (40) are positioned in the same horizontal plane.

6. The radial force measuring device for a turbine model according to claim 5, characterized in that, All the pressure detection units (40) are evenly spaced on the same horizontal plane.

7. The radial force measuring device for a turbine model according to claim 6, characterized in that, At least two of the pressure detection units (40) are respectively arranged in the X and Y directions of the same horizontal plane, and the X and Y directions are perpendicular to each other.

8. The radial force measuring device for a turbine model according to claim 1, characterized in that, The upper end of the main shaft (30) is connected to the hydrostatic bearing swing sleeve (20) through the first bearing (31), and the lower end of the main shaft (30) is connected to the hydrostatic bearing swing sleeve (20) through the second bearing (32).

9. The radial force measuring device for a hydraulic turbine model according to claim 1, wherein The radial force measuring device for the turbine model also includes: The oil supply system has an oil outlet end that is connected to the axial high-pressure oil chamber (21) and the radial high-pressure oil chamber (22), respectively.

10. The radial force measuring device for a turbine model according to any one of claims 1-9, characterized in that, The main shaft (30) is installed on the upper part of the runner (100) of the turbine model, and the hydrostatic bearing sleeve (10) is installed on the unit top cover of the turbine model.

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