A tool for removing a bushing of a movable guide vane of a hydraulic turbine

Abstract

The utility model relates to a kind of removal tools of water turbine movable guide vane bushing, removal tool includes: base, shaped as the annular structure that the upper end of the movable guide vane can pass through middle part, the lower surface of the base is used to abut on the upper end surface of inner bushing, outer bushing;Screw, the upper end surface of the base and inner bushing, outer bushing are correspondingly provided with mounting hole for screw to pass through so as to lock it;Driving element, the upper surface of the base is provided with the inverted U-shaped support arm extending upwards, the top of this inverted U-shaped support arm is located above the upper end of movable guide vane and installation space is formed between the two, the driving element can be telescopically arranged in the installation space, and the driving element bottom and the upper end of movable guide vane are abutted, and the top and the top wall of inverted U-shaped support arm are abutted.The utility model is simple in structure, convenient to operate, and can quickly and effectively remove inner and outer bushings, so as to facilitate the movable guide vane to be removed from the top cover.

Description

Technical Field

[0001] This utility model relates to the field of disassembly and assembly technology of water pumps and turbines, specifically to a tool for removing the movable guide vanes of a water turbine. Background Technology

[0002] Pumped storage power stations have large energy storage capacity and high storage and release efficiency. Pump turbines, as a new type of pumped storage unit, have wide applications. For example, Chinese patent ZL 202322143687.1, "A Sealing Structure for the Guide Blade Bushing of a Pump Turbine," discloses a sealing structure for the guide blade bushing of a turbine, wherein a polyurethane seal is provided below the bushing and the intermediate bushing to form a good seal.

[0003] Pump-turbines are characterized by frequent start-ups and shutdowns and constant changes in operating conditions, necessitating periodic disassembly and maintenance. In the Ningbo Xikou Pumped Storage Power Station, the movable guide vanes of the pump-turbine system are installed on the turbine's top cover. The middle section of the guide vane's shaft is secured by inner and outer bushings. During unit maintenance, the inner and outer bushings must be removed before the guide vanes can be taken out. However, due to the rubber seals nested at the lower end of the outer bushing and the upper end of the inner bushing, significant axial friction exists, making removal difficult and requiring substantial manpower and resources for each maintenance operation. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a tool for removing the inner and outer bushings of a water turbine movable guide vane bushing, which is convenient and easy to operate, in light of the current state of the technology.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A tool for removing the bushing of a movable guide vane of a water turbine, wherein the movable guide vane is installed on the top cover of the water turbine, the top cover has a through shaft hole, the movable guide vane is arranged through the shaft hole of the top cover, and an inner bushing and an outer bushing are sequentially fitted around the movable guide vane, with the upper end faces of the inner bushing and the outer bushing protruding above the shaft hole; the removal tool includes:

[0007] The base is formed into a ring-shaped structure in the middle through which the upper end of the movable guide vane can pass, and the lower surface of the base is used to abut against the upper end surfaces of the inner and outer bushings.

[0008] The base and the upper surfaces of the inner and outer bushings are respectively provided with mounting holes for the screw to pass through and thus lock it in place; and

[0009] The driving component has an inverted U-shaped support arm extending upward on the upper surface of the base. The top of the inverted U-shaped support arm is located above the upper end of the movable guide vane, and an installation space is formed between the two. The driving component is telescopically disposed in the installation space, and the bottom of the driving component abuts against the upper end of the movable guide vane, and the top of the driving component abuts against the top wall of the inverted U-shaped support arm.

[0010] Using the above structure, when in use, first place the retracted drive unit on the upper surface of the movable guide vane, then pass the middle of the base through the upper end of the movable guide vane and let its lower end face abut against the upper surface of the inner and outer bushings. Select the bushing to be removed, tighten the screws between the base and the corresponding bushing, and then extend the operating drive unit upward to drive the inverted U-shaped support arm to move upward, thereby pulling the bushing connected to it upward through the base.

[0011] Preferably, the upper end face of the inner bushing is located above the upper end face of the outer bushing, the outer periphery of the lower surface of the base abuts against the upper end face of the outer bushing, and the inner ring of the lower surface of the base is recessed upward to form a stepped surface abutting against the upper end face of the inner bushing. To improve the sealing effect, the height of the upper end of the inner bushing is slightly higher than that of the outer bushing. The stepped surface structure described above can better adapt to the height of the inner and outer bushings, ensuring high locking reliability when the base is locked with the outer bushing.

[0012] Preferably, the upper surface of the base extends upward and thickens at the corresponding inner ring portion to form a compensating reinforcement structure. The compensating reinforcement structure has a first mounting hole corresponding to the upper end face of the inner bushing below it, allowing screws to pass through. This structure provides better support for the removal of the inner bushing and offers high reliability.

[0013] Preferably, the upper end face of the outer bushing extends radially outward to form a support edge that abuts against the upper surface of the top cover, and the lower surface of the outer periphery of the base abuts against this support edge. The outer periphery of the base and the support edge below it are respectively provided with second mounting holes for screws to pass through. This structure increases the contact surface between the outer bushing and the base when removing it, which helps improve the reliability of the outer bushing's assembly and disassembly.

[0014] Preferably, the two ends of the inverted U-shaped support arm are respectively connected to the upper surface of the outer periphery of the base, and triangular reinforcing ribs are respectively provided on both sides of the end of the inverted U-shaped support arm. Connecting the two ends of the inverted U-shaped support arm to the outer periphery increases the width of the installation space, providing sufficient installation space for the drive component. At the same time, the above structure also helps to enhance the connection strength between the inverted U-shaped support arm and the base.

[0015] Preferably, the main body of the drive component abuts against the upper surface of the movable guide vane, the telescopic portion of the upper part of the drive component is arranged corresponding to the top of the inverted U-shaped support arm, and the side of the drive component is provided with an operating part that extends out from the side of the installation space to control whether the telescopic portion extends or retracts. This utility model preferably uses a jack as the drive component, but other hydraulic or pneumatic drive structures can also be used, as long as their size meets the requirements of the installation space, to facilitate convenient and quick removal of the bushing.

[0016] Preferably, the middle section of the movable guide vane is arranged through the shaft hole so that its lower guide vane portion is located below the top cover. A limiting ring is provided between the guide vane portion and the middle section, which limits the movement to the lower surface of the top cover. The middle section is located above the inner bushing and its top is connected to an upper section with a decreasing diameter. The diameter of the inner surface of the base gradually increases from top to bottom, forming a clearance structure to facilitate the passage of the upper end of the middle section. The clearance structure on the inner surface of the base makes it easier to place the base outside the middle bushing and move it downwards to abut against the upper surface of the bushing. This clearance structure also allows the base to moderately avoid the middle section of the movable guide vane during screw tightening, improving the tightening effect.

[0017] Compared with the prior art, the advantages of this utility model are as follows: This utility model provides a special tool for removing the inner and outer bushings, specifically for the structure where the movable guide vane and the top cover are sealed by inner and outer bushings. In use, first place the retracted drive unit on the upper surface of the movable guide vane, then pass the middle of the base through the upper end of the movable guide vane and place its lower end against the upper surface of the inner and outer bushings. Select the bushing to be removed, tighten the screws between the base and the corresponding bushing, then extend the drive unit upwards, driving the inverted U-shaped support arm to move upwards, thereby pulling the bushing connected to it upwards through the base. This utility model has a simple structure, is easy to operate, and can quickly and effectively remove the inner and outer bushings, thus facilitating the removal of the movable guide vane from the top cover, saving time and effort. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 A sectional view;

[0020] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0021] Figure 4 for Figure 1 Partial exploded view;

[0022] Figure 5 This is a schematic diagram of the base structure in an embodiment of this utility model. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown in Figure 5, the dismantling tool in this embodiment is specifically used to remove the inner and outer bushings of the movable guide vane 100 of the water turbine. The movable guide vane 100 is installed on the top cover 200 of the water turbine. The top cover 200 has a shaft hole 20 that runs vertically through it. The movable guide vane 100 passes through the shaft hole 20 of the top cover 200. An inner bushing 300 and an outer bushing 400 are sequentially fitted around the movable guide vane 100, and the upper end faces of the inner bushing 300 and the outer bushing 400 are exposed above the shaft hole 20.

[0025] The demolition tools in this embodiment include:

[0026] The base 1 is formed into a ring structure in the middle through which the upper end of the movable guide vane 100 can pass. The lower surface of the base 1 is used to abut against the upper end surfaces of the inner bushing 300 and the outer bushing 400.

[0027] The upper surfaces of the screw 2, the base 1, the inner bushing 300, and the outer bushing 400 are respectively provided with mounting holes 500 for the screw 2 to pass through and thus lock it.

[0028] The upper surface of the base 1 of the drive component 3 is provided with an upwardly extending inverted U-shaped support arm 11. The top of the inverted U-shaped support arm 11 is located above the upper end of the movable guide vane 100 and an installation space 10 is formed between the two. The drive component 3 is telescopically disposed in the installation space 10, and the bottom of the drive component 3 abuts against the upper end of the movable guide vane 100 and the top abuts against the top wall of the inverted U-shaped support arm 11.

[0029] In this embodiment, the upper end face of the inner bushing 300 is located above the upper end face of the outer bushing 400. The outer periphery of the lower surface of the base 1 abuts against the upper end face of the outer bushing, and the inner ring of the lower surface of the base 1 is recessed upward to form a stepped surface 12 that abuts against the upper end face of the inner bushing. To improve the sealing effect, the height of the upper end of the inner bushing 300 is slightly higher than that of the outer bushing 400. The stepped surface 12 structure described above can better adapt to the height of the inner and outer bushings, ensuring high locking reliability when the base 1 is locked with the outer bushing 400.

[0030] The upper surface of the base 1 extends upward and thickens at the corresponding inner ring portion to form a compensating reinforcement structure 13. The compensating reinforcement structure 13 and the upper end face of the inner bushing 300 below it are provided with a first mounting hole 500 for the screw 2 to pass through. This structure provides better support for the removal of the inner bushing 300 and has good reliability.

[0031] In this embodiment, the upper end face of the outer bushing extends radially outward to form a support edge 401 that abuts against the upper surface of the top cover 200, and the lower surface of the outer periphery of the base 1 abuts against this support edge 401. A second mounting hole 600 for the screw 2 to pass through is correspondingly provided on the outer periphery of the base 1 and the support edge 401 below it. This structure increases the contact surface between the outer bushing 400 and the base 1 when removing it, which helps improve the reliability of the assembly and disassembly of the outer bushing 400.

[0032] The two ends of the aforementioned inverted U-shaped support arm 11 are respectively connected to the upper surface of the outer periphery of the base 1, and triangular reinforcing ribs 111 are respectively provided on both sides of the ends of the inverted U-shaped support arm 11. Connecting the two ends of the inverted U-shaped support arm 11 to the outer periphery increases the width of the installation space 10, providing sufficient installation space 10 for the drive component 3. At the same time, the above structure also helps to enhance the connection strength between the inverted U-shaped support arm 11 and the base 1.

[0033] In this embodiment, the main body 31 of the drive component 3 abuts against the upper surface of the movable guide vane 100. The telescopic part 32 of the upper part of the drive component 3 is arranged corresponding to the top of the inverted U-shaped support arm 11. The side of the drive component 3 is provided with an operating part 33 that extends out from the side of the installation space 10 to control whether the telescopic part 32 extends or retracts. In this embodiment, a jack is preferably used as the drive component 3. Of course, other hydraulic or pneumatic drive structures can also be used, as long as the size meets the requirements of the installation space 10, so as to facilitate the removal of the bushing.

[0034] In this embodiment, the middle section 102 of the movable guide vane 100 passes through the shaft hole 20, so that the lower guide vane portion 101 is located below the top cover 200. A limiting ring 103 is provided between the guide vane portion 101 and the middle section 102 to limit the lower surface of the top cover 200. The middle section 102 is located above the inner bushing 300 and is connected to the upper section 104 with a decreasing diameter at the top. The diameter of the inner surface of the base 1 gradually increases from top to bottom, forming a clearance structure 15 to facilitate the passage of the upper end of the middle section 102. The clearance structure on the inner surface of the base 1 makes it easier to place the base 1 outside the middle bushing and move it downward to abut against the upper end surface of the bushing. The clearance structure also allows the base 1 to make appropriate clearance to the middle section 102 of the movable guide vane 100 during the tightening of the screw 2, thereby improving the tightening effect.

[0035] This embodiment addresses the structure where the movable guide vane 100 and the top cover 200 are sealed by inner and outer bushings, and provides a dedicated tool for removing the inner and outer bushings. In use, first, the base 1 is passed through the upper end of the movable guide vane 100, with its lower end face abutting against the upper end face of the bushing. The outer bushing to be removed is selected, and the base 1 is tightened with screws 2. Then, the retracted drive component 3 is placed in the installation space 20, with the drive component 3 abutting against the upper end face of the movable guide vane 100 and its telescopic end facing upwards. The drive component 3 is then extended upwards until its upper telescopic end abuts against the inverted U-shaped support arm 11. The drive component 3 continues to extend upwards, driving the inverted U-shaped support arm 11 to move upwards, thereby connecting it to the base 1. Pull the outer bushing upwards; then loosen the screws between the base 1 and the outer bushing 400, then pass the middle of the base 1 through the upper end of the movable guide vane 100 and let its lower end face abut against the upper end face of the inner bushing 300. Tighten the screws 2 between the base 1 and the corresponding inner bushing 300. Then extend the operating drive 3 upwards and drive the inverted U-shaped support arm 11 to move upwards, thereby pulling the inner bushing connected to it upwards through the base 1, thus completing the removal of the inner and outer bushings. At this time, lift the top cover and remove it, thus realizing the disassembly of the movable guide vane and the top cover, which is convenient for maintenance of both.

[0036] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A tool for removing the bushing of a movable guide vane of a water turbine, wherein the movable guide vane (100) is installed on the top cover (200) of the water turbine, the top cover (200) has a through shaft hole (20), the movable guide vane (100) is arranged through the shaft hole (20) of the top cover (200), and an inner bushing (300) and an outer bushing (400) are sequentially fitted around the movable guide vane (100), and the upper end faces of the inner bushing (300) and the outer bushing (400) are exposed above the shaft hole (20), characterized in that: The demolition tools include The base (1) is formed into an annular structure in the middle through which the upper end of the movable guide vane (100) can pass. The lower surface of the base (1) is used to abut against the upper end surfaces of the inner bushing (300) and the outer bushing (400). Screw (2), the base (1) and the upper end faces of the inner bushing (300) and the outer bushing (400) are respectively provided with mounting holes for the screw (2) to pass through and lock it; and The driving component (3) has an inverted U-shaped support arm (11) extending upward on the upper surface of the base (1). The top of the inverted U-shaped support arm (11) is located above the upper end of the movable guide vane (100), and an installation space (10) is formed between the two. The driving component (3) is telescopically disposed in the installation space (10), and the bottom of the driving component (3) abuts against the upper end of the movable guide vane (100), and the top abuts against the top wall of the inverted U-shaped support arm (11).

2. The removal tool for a bushing of a guide vane of a hydraulic turbine according to claim 1, characterized in that: The upper end face of the inner bushing is located above the upper end face of the outer bushing. The outer periphery of the lower surface of the base (1) abuts against the upper end face of the outer bushing. The inner ring of the lower surface of the base (1) is recessed upward to form a stepped surface (12) that abuts against the upper end face of the inner bushing.

3. The tool for removal of a bushing of a guide vane of a hydraulic turbine according to claim 2, characterized in that: The upper surface of the base (1) extends upward and thickens at the corresponding inner ring portion to form a compensation and reinforcement structure (13).

4. The tool for removal of a bushing of a wicket gate of a hydraulic turbine according to claim 3, characterized in that: The compensation and reinforcement structure has a first mounting hole (500) corresponding to the upper end face of the inner bushing (300) below it for the screw (2) to pass through.

5. The tool for removal of the bushing of the guide vane of the hydraulic turbine according to claim 2, characterized in that: The upper end face of the outer bushing extends radially outward to form a support edge (401) that abuts against the upper surface of the top cover (200), and the lower surface of the outer periphery of the base (1) abuts against the support edge (401).

6. The tool for removal of a bushing of a wicket gate of a hydraulic turbine according to claim 5, characterized in that: The outer periphery of the base (1) and the support edge (401) below it are provided with second mounting holes (600) for screws (2) to pass through.

7. The tool for removal of the bushing of the guide vane of the hydraulic turbine according to claim 2, characterized in that: The two ends of the inverted U-shaped support arm (11) are respectively connected to the upper surface of the outer part of the base (1), and triangular reinforcing ribs (111) are respectively provided on both sides of the end of the inverted U-shaped support arm (11).

8. The removal tool for a bushing of a guide vane of a hydraulic turbine according to any one of claims 1 to 7, characterized in that: The main body (31) of the drive member (3) abuts against the upper surface of the movable guide vane (100). The telescopic part (32) of the upper part of the drive member (3) is arranged corresponding to the top of the inverted U-shaped support arm (11). The side of the drive member (3) is provided with an operating part (33) that extends out of the side of the installation space (10) to control whether the telescopic part (32) is extended or not.

9. The tool for removal of a bushing of a wicket gate of a hydraulic turbine according to any of claims 1 to 7, characterized in that: The middle section (102) of the movable guide vane (100) is arranged through the shaft hole (20) so that the guide vane part (101) at its lower end is located below the top cover (200). A limiting ring (103) is provided between the guide vane part (101) and the middle section (102) to limit the lower surface of the top cover (200). The middle section (102) is located above the inner bushing (300) and the top is connected to the upper section (104) with a reduced diameter. The diameter of the inner surface of the base (1) gradually increases from top to bottom to form a clearance structure that facilitates the passage of the upper end of the middle section (102).

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