Quick dismounting device for lower shaft sleeve of movable guide vane of large hydropower station

Abstract

The utility model provides a large hydropower station movable guide vane lower shaft sleeve quick dismounting device which comprises a bottom ring, a shaft hole is formed in the bottom ring, a lower shaft sleeve is arranged in the shaft hole, a step hole is formed in the bottom ring corresponding to the lower portion of the shaft hole, and a bottom plate abutting against the bottom face of the lower shaft sleeve is arranged in the step hole. A top plate is arranged at the end, away from the bottom plate, of the shaft hole, the bottom plate and the top plate are detachably and fixedly connected, and a telescopic lifting piece is arranged between the top plate and the bottom ring. The bottom plate and the top plate are arranged, the bottom plate abuts against the lower shaft sleeve from the lower end of the lower shaft sleeve, the top plate is jacked up through the telescopic lifting piece so as to drive the bottom plate to move upwards, and the lower shaft sleeve is detached from the shaft hole.

Description

Technical Field

[0001] This utility model relates to the field of hydro-generator technology, and in particular to a quick disassembly device for the lower bushing of the movable guide vane in a large hydropower station. Background Technology

[0002] Large-scale reaction turbine generator sets are all equipped with a water guiding mechanism, which is one of the core components of the turbine generator set. It is a device that controls the direction and amount of water flowing into the unit during operation, and is also used to cut off the water flow into the turbine, realize start-up and shutdown operations and emergency shutdown, and is crucial to the stability and safety of the entire unit operation.

[0003] In the guide vane mechanism, the rotatable and adjustable blades installed in front of the runner of a reaction turbine, evenly distributed along the circumference, are called movable guide vanes. The main function of the movable guide vane bushing is to fix the radial oscillation of the movable guide vanes, allowing the guide vanes to open and close smoothly to control the flow rate entering the runner. During unit operation, the movable guide vanes rotate and rub against the bushing. Over time, the gap between the movable guide vane shaft and the bushing increases, causing the movable guide vanes to lose their restraint and oscillate radially. Therefore, the guide vane bushing needs to be repaired or replaced during the unit's major overhaul to ensure the safe and stable operation of the unit.

[0004] The lower bushing of the movable guide vane is installed on the bottom ring of the turbine with a clearance fit. After a long period of operation, disassembly is difficult. In the past, destructive removal was used during maintenance, which resulted in problems such as damage to the bottom ring mating surface, long disassembly time, and inability to repair the bushing. Utility Model Content

[0005] This utility model aims to at least partially solve one of the technical problems in the related art.

[0006] To achieve the above objectives, this utility model proposes a quick disassembly device for the lower bushing of a movable guide vane in a large hydropower station, comprising a bottom ring, a shaft hole on the bottom ring, a lower bushing disposed in the shaft hole, a stepped hole below the shaft hole on the bottom ring, a bottom plate disposed in the stepped hole that abuts against the bottom surface of the lower bushing, a top plate disposed at the end of the shaft hole away from the bottom plate, the bottom plate and the top plate being detachably and fixedly connected, and a telescopic lifting component disposed between the top plate and the bottom ring.

[0007] This utility model uses a base plate and a top plate. The base plate abuts against the lower bushing from the lower end of the lower bushing. The top plate is lifted by a telescopic lifting component, which in turn moves the base plate upward to remove the lower bushing from the shaft hole.

[0008] Optionally, a connecting bolt is provided through the top plate and the bottom plate, and both the top plate and the bottom plate are provided with connecting holes for the connecting bolt to pass through. After the connecting bolt passes through two of the connecting holes, a fixing nut is threaded onto it.

[0009] Furthermore, the base plate includes an integrally formed main body plate and two symmetrically arranged arc-edge plates. The main body plate is rectangular, and the two arc-edge plates are symmetrically arranged on the two wide sides of the main body plate.

[0010] Furthermore, the thickness of the base plate is not less than 30mm; the width of the base plate is not less than 100mm; and the length of the base plate is greater than the inner diameter of the lower bushing and less than the outer diameter of the lower bushing.

[0011] Furthermore, the maximum diameter of the top plate is greater than the outer diameter of the lower bushing, and the thickness of the top plate is not less than the thickness of the bottom plate.

[0012] Furthermore, the telescopic lifting component is configured as a jack.

[0013] Furthermore, the telescopic lifting components are provided in multiple sets, and the multiple sets of telescopic lifting components are symmetrically arranged about the axis of the lower bushing.

[0014] Furthermore, the top plate is provided with a positioning groove for aligning and inserting the telescopic lifting component.

[0015] Furthermore, both the top plate and the bottom plate are made of steel plates.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0018] Fig. 1 This is a schematic diagram of the overall structure of a quick disassembly device for the lower bushing of a movable guide vane in a large hydropower station, according to the present invention.

[0019] Fig. 2 This is a top view of the base plate structure of another quick disassembly device for the lower bushing of the movable guide vane of a large hydropower station according to the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Bottom ring; 11. Shaft hole; 12. Step hole; 2. Lower bushing; 3. Top plate; 4. Bottom plate; 41. Main plate; 42. Arc edge plate; 5. Connecting bolt; 6. Fixing nut; 7. Telescopic lifting component; 8. Connecting hole; 9. Positioning groove. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0023] This utility model proposes a quick disassembly device for the lower bushing 2 of the movable guide vane in a large hydropower station, as detailed below. Figs. 1-2 Please provide a detailed explanation.

[0024] A quick-release device for the lower bushing 2 of the movable guide vane of a large hydropower station includes a bottom ring 1, a shaft hole 11 on the bottom ring 1, a lower bushing 2 disposed in the shaft hole 11, a stepped hole 12 below the shaft hole 11 on the bottom ring 1, a bottom plate 4 that abuts against the bottom surface of the lower bushing 2 disposed in the stepped hole 12, a top plate 3 disposed at the end of the shaft hole 11 away from the bottom plate 4, the bottom plate 4 and the top plate 3 are detachably and fixedly connected, and a telescopic lifting component 7 is disposed between the top plate 3 and the bottom ring 1.

[0025] This utility model sets up a base plate 4 and a top plate 3. The base plate 4 abuts against the lower bushing 2 from the lower end of the lower bushing 2. The telescopic lifting member 7 lifts the top plate 3, thereby driving the base plate 4 to move upward and remove the lower bushing 2 from the shaft hole 11.

[0026] In some embodiments, a connecting bolt 5 is provided through the top plate 3 and the bottom plate 4. Both the top plate 3 and the bottom plate 4 have connecting holes 8 for the connecting bolt 5 to pass through. After passing through two of these connecting holes 8, the connecting bolt 5 is threadedly connected to a fixing nut 6. The top plate 3 and the bottom plate 4 are detachably fixed together by the connecting bolt 5, facilitating the disassembly and installation of the bottom plate 4 and the top plate 3. When fixing the connecting bolt 5, the head of the connecting bolt 5 faces downwards, and the stud end passes through two connecting holes 8 in sequence before being fixedly connected to the upper surface of the top plate 3 by the fixing nut 6. In one embodiment, the connecting bolt 5 can be replaced with a connecting screw, both ends of which are detachably threaded with fixing nuts 6.

[0027] In some embodiments, the base plate 4 includes an integrally formed main body plate 41 and two symmetrically arranged arc-edge plates 42. The main body plate 41 is rectangular, and the two arc-edge plates 42 are symmetrically arranged on the two wide sides of the main body plate 41. The integral arrangement of the main body plate 41 and the arc-edge plates 42 makes the base plate 4 as a whole elongated shape, which facilitates the use of the base plate 4 by first placing it upright in a non-horizontal position under the lower bushing 2, and then placing the base plate 4 horizontally so that the arc-edge plates 42 on both sides of the base plate 4 can abut against the lower end face of the lower bushing 2. Then, the base plate 4 and the top plate 3 are fixedly connected by connecting bolts 5, thereby completing the position fixation of the base plate 4.

[0028] In one embodiment, the top plate 3 may have the same shape as the bottom plate 4. In another embodiment, the top plate 3 may have the shape of a rectangular plate, a circular plate, a parallelogram plate, or other centrally symmetrical shapes.

[0029] In some embodiments, the thickness of the base plate 4 is not less than 30mm; the width of the base plate 4 is not less than 100mm; and the length of the base plate 4 is greater than the inner diameter of the lower bushing 2 and less than the outer diameter of the lower bushing 2. The specifications of the base plate 4 ensure its strength and prevent the base plate 4 from bending in the middle due to insufficient strength when the telescopic lifting member 7 lifts the top plate 3.

[0030] In some embodiments, the maximum diameter of the top plate 3 is larger than the outer diameter of the lower bushing 2, which facilitates the arrangement of the telescopic lifting member 7 near the shaft hole 11. This allows the telescopic lifting member 7 to be completely covered by the top plate 3, making the force application point of the telescopic lifting member 7 closer to the center of the main body of the top plate 3, thereby reducing the possibility of bending in the middle of the top plate 3. Furthermore, the thickness of the top plate 3 is not less than the thickness of the bottom plate 4, ensuring the self-strength of the top plate 3 and further reducing the possibility of bending in the middle of the top plate 3.

[0031] In some embodiments, the telescopic lifting component 7 is configured as a jack. Due to the different specific installation conditions between the lower bushing 2 and the shaft hole 11, when using jacks, the model selection can be gradually increased from small to large. If the lower bushing 2 cannot be disassembled, a higher tonnage jack can be used for disassembly. At the same time, the connecting bolt 5 can be adjusted according to the different jacks selected, and the connection length of the threaded connection part can be adjusted, or a longer or shorter connecting bolt 5 can be replaced.

[0032] In some embodiments, multiple sets of telescopic lifting components 7 are provided, and these multiple sets of telescopic lifting components 7 are symmetrically arranged about the axis of the lower bushing 2. The symmetrical arrangement of the telescopic lifting components 7 can keep the top plate 3 in a horizontal state during the rising process, ensuring that the direction of the force applied by the bottom plate 4 to the lower bushing 2 is always parallel to the axis of the shaft hole 11. This avoids the situation where, when a single or asymmetrical telescopic lifting component 7 lifts the top plate 3, the bottom plate 4 applies force at an angle, which would increase the friction between the lower bushing 2 and the inner wall of the shaft hole 11, making the lower bushing 2 more difficult to disassemble.

[0033] In some embodiments, the top plate 3 is provided with a positioning groove 9 for aligning and inserting the telescopic lifting component 7. The positioning groove 9 can effectively speed up the installation of the telescopic lifting component 7. When placing the telescopic lifting component 7, the workers only need to align the telescopic lifting component 7 with the positioning groove 9 to complete the symmetrical arrangement, avoiding the situation where a lot of time is spent finding symmetrical positions during the construction process.

[0034] In some embodiments, both the top plate 3 and the bottom plate 4 are made of steel plates. The use of steel plates for the top plate 3 and the bottom plate 4 ensures the strength of the material itself and further reduces the possibility of bending in the middle of the top plate 3 and the bottom plate 4.

[0035] The working principle of this utility model is as follows: The base plate 4 is placed at an angle or vertically into the bottom of the lower bushing 2. Then, the base plate 4 is placed horizontally so that the arc edge plates 42 on both sides are aligned with the lower end face of the lower bushing 2. Then, the stud end passes through the two connecting holes 8 in sequence and is fixedly connected to the upper surface of the top plate 3 by the fixing nut 6. After the fixed connection and installation of the top plate 3 and the base plate 4 are completed, the telescopic lifting component 7 is placed between the top plate 3 and the bottom ring 1, and the telescopic lifting component 7 is aligned with the positioning groove 9. Then, the top plate 3 is lifted by controlling the telescopic lifting component 7. The top plate 3 drives the base plate 4 to move upward, thereby completing the disassembly of the lower bushing 2. If the selected telescopic lifting component 7 cannot remove the lower bushing 2, a telescopic lifting component 7 with a larger tonnage can be replaced for disassembly.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 utility model and simplifying the description, and are not intended to 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 utility model.

[0037] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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, an electrical connection, or a connection that allows communication between them; 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 utility model according to the specific circumstances.

[0039] In this utility model, 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," "on top of," and "over" 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.

[0040] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A quick-release device for the lower bushing of a movable guide vane in a large hydropower station, comprising a bottom ring, wherein a shaft hole is formed on the bottom ring, and a lower bushing is disposed in the shaft hole, characterized in that, The bottom ring has a stepped hole below the corresponding shaft hole. A bottom plate that abuts against the bottom surface of the lower bushing is provided in the stepped hole. A top plate is provided at the end of the shaft hole away from the bottom plate. The bottom plate and the top plate are detachably and fixedly connected. A telescopic lifting component is provided between the top plate and the bottom ring.

2. The quick-release device for the lower bushing of the movable guide vane of a large hydropower station as described in claim 1, characterized in that, A connecting bolt is provided between the top plate and the bottom plate. Both the top plate and the bottom plate are provided with connecting holes for the connecting bolt to pass through. After the connecting bolt passes through two of the connecting holes, a fixing nut is threaded onto it.

3. The quick-release device for the lower bushing of the movable guide vane of a large hydropower station as described in claim 1, characterized in that, The base plate includes an integrally formed main body plate and two symmetrically arranged arc-edge plates. The main body plate is rectangular, and the two arc-edge plates are symmetrically arranged on the two wide sides of the main body plate.

4. The quick-release device for the lower bushing of the movable guide vane of a large hydropower station as described in claim 3, characterized in that, The thickness of the base plate is not less than 30mm; the width of the base plate is not less than 100mm; and the length of the base plate is greater than the inner diameter of the lower bushing and less than the outer diameter of the lower bushing.

5. A quick-release device for the lower bushing of movable guide vanes in a large hydropower station as described in claim 3, characterized in that, The maximum diameter of the top plate is greater than the outer diameter of the lower bushing, and the thickness of the top plate is not less than the thickness of the bottom plate.

6. The quick-release device for the lower bushing of the movable guide vane of a large hydropower station as described in claim 1, characterized in that, The telescopic lifting component is a jack.

7. A quick-release device for the lower bushing of a movable guide vane in a large hydropower station as described in claim 6, characterized in that, The telescopic lifting components are provided in multiple sets, and the multiple sets of telescopic lifting components are symmetrically arranged about the axis of the lower bushing.

8. A quick-release device for the lower bushing of a movable guide vane in a large hydropower station as described in claim 1, characterized in that, The top plate is provided with a positioning groove for aligning and inserting the telescopic lifting component.

9. A quick-release device for the lower bushing of a movable guide vane in a large hydropower station as described in claim 1, characterized in that, Both the top plate and the bottom plate are made of steel plates.

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