A shaft sleeve dismounting device for guide vane of water turbine

Abstract

The utility model discloses a water turbine guide vane middle shaft sleeve dismounting device, including arc seat, screw rod and hollow jack, a plurality of arc seat splices and forms ring structure, and arc seat includes upper arc plate, lower arc plate and stand, and upper arc plate and lower arc plate are coaxial arrangement, and a plurality of stands are fixedly connected between upper arc plate and lower arc plate, and the inner circumference of upper arc plate has the overhanging section of lower arc plate inner circumferential wall, is provided with a plurality of first through -hole on the overhanging section, and upper arc plate and lower arc plate still respectively coaxially set up a plurality of second through -holes on, screw rod is used for wearing into first through -hole or second through -hole, and hollow jack is sleeved on screw rod, and the adjustable position of screw rod on the upper end of hollow jack installs the limiting device, the utility model discloses can under not disassembling upper shaft sleeve and crank arm etc. part condition, to middle shaft sleeve is disassembled, and after middle shaft sleeve dismounts, can carry out the replacement of sealing and bearing bush, and after sealing and bearing bush replacement complete, again through the device to middle shaft sleeve is back loaded.

Description

Technical Field

[0001] This utility model relates to the technical field of water turbine maintenance tools, and in particular to a device for disassembling and assembling the guide vane bushing of a water turbine. Background Technology

[0002] The core function of the turbine guide vane bushing is to provide stable, low-friction rotational support for the guide vane journal, effectively seal against high-pressure water leakage, and bear the load of the guide vane. This ensures the flexible, precise, and reliable operation of the guide vane mechanism, reduces wear and leakage losses, and ultimately guarantees the efficient, stable, and long-term operation of the turbine. After long-term operation, the turbine guide vane bushing may experience defects such as wear and leakage of the seal ring between the bushing and the guide vane journal, as well as wear of the bushing bearing. Replacement of the bushing and seal ring is necessary. However, the small clearance between the bushing and the top cover and guide vane shaft diameter makes disassembly and assembly difficult.

[0003] In the prior art, Chinese patent document CN222405504U, published on January 28, 2025, discloses a tool for disassembling the guide vane intermediate shaft sleeve of a hydro-generator set. The tool includes an adapter ring with a through hole for screws to pass through. The screws pass through the through hole and are installed in the mounting hole of the intermediate shaft sleeve sealing plate on the guide vane intermediate shaft sleeve. The adapter ring is connected to several connecting rods, with a lifting plate at the upper end of each connecting rod and a jack below the lifting plate. The jack is placed on the upper end face of the guide vane journal. Although this tool can be used to disassemble the guide vane intermediate shaft sleeve, it requires disassembling the upper shaft sleeve and crank arm, resulting in a long construction period.

[0004] In addition, Chinese patent document CN222405503U, published on January 28, 2025, discloses a tool for disassembling the guide vane intermediate shaft sleeve of a hydro turbine generator set without a lifting arm. The tool includes two sets of semi-circular rings, which together form a transition ring. The semi-circular rings have through holes corresponding to the mounting holes of the intermediate shaft sleeve sealing pressure plate on the guide vane intermediate shaft sleeve. Bolts pass through the through holes and are installed in the mounting holes of the intermediate shaft sleeve sealing pressure plate on the guide vane intermediate shaft sleeve. The semi-circular rings have several threaded holes that mate with set screws. The pitch circle of the threaded holes is set above the mounting base of the top cover. The set screws are set on the upper side of the mounting base of the top cover. By turning the set screws with a wrench, the transition ring drives the guide vane intermediate shaft sleeve to move upward. Its advantages are: the tool can remove the guide vane bushing in advance without lifting the crank arm or the upper bushing, thus avoiding the disassembly of the guide vane bushing from taking up the straight-line construction period; its disadvantage is: the tool uses a wrench to turn the set screw to move the adapter ring upward to disassemble the guide vane bushing, but the document does not disclose how to reinstall the bushing. Utility Model Content

[0005] The technical problem to be solved by this utility model is to solve the problems existing in the background art above and provide a turbine guide vane intermediate shaft sleeve disassembly and assembly device, which can disassemble the intermediate shaft sleeve without disassembling the upper shaft sleeve and crank arm and other components. After the intermediate shaft sleeve is disassembled, the seal and bearing can be replaced. After the seal and bearing are replaced, the intermediate shaft sleeve can be reassembled through this device.

[0006] The purpose of this utility model is achieved as follows: A device for disassembling and assembling the guide vane bushing of a water turbine includes an arc-shaped seat, a screw, and a hollow jack. Multiple arc-shaped seats are provided, and these seats are assembled to form a ring structure. Each arc-shaped seat includes an upper arc plate, a lower arc plate, and columns. The upper and lower arc plates are coaxially arranged, and multiple columns are fixed between the upper and lower arc plates. The inner diameter of the upper arc plate is smaller than that of the lower arc plate, so that the inner circumference of the upper arc plate has a protruding section extending beyond the inner circumference of the lower arc plate. Multiple first through holes are provided on the protruding section. Multiple second through holes are also coaxially arranged on the upper and lower arc plates. In use, the screw is inserted into either the first or second through hole, and the hollow jack is fitted onto the screw. A limit device is installed on the screw at an adjustable position at the upper end of the hollow jack. The hollow jack is used to push the screw upwards or press down on the arc-shaped seat.

[0007] The upper arc plate has upper ear seats at both ends, and upper ear seats have upper ear holes; the lower arc plate has lower ear seats at both ends, and lower ear seats have lower ear holes. When multiple arc seats are assembled to form a ring structure, the upper ear seats of adjacent upper arc plates are connected and fixed by a first bolt, and the lower ear seats of adjacent lower arc plates are connected and fixed by a second bolt.

[0008] There are two upper arc plates and two lower arc plates.

[0009] A perforated pressure sensor is also fitted on the screw between the limiting device and the hollow jack.

[0010] The limiting device includes a nut and a flat washer. The flat washer is fitted onto the screw rod, and the nut is screwed onto the screw rod. The nut is located on the upper side of the flat washer.

[0011] The second through hole is located between adjacent columns.

[0012] The second through hole is coaxial with the column and penetrates the column.

[0013] The number of hollow jacks is matched with the number of screws, and multiple hollow jacks are connected to the hydraulic device through pipes.

[0014] The hydraulic device includes a hydraulic pump and a distributor. The pressure output end of the hydraulic pump is connected to the input end of the distributor through a pipeline. The distributor has multiple output ends, and the output ends of the distributor are connected to a hollow jack through hydraulic hoses.

[0015] The hydraulic pump can be an electric pump or a manual pump.

[0016] The features of this utility model using the above-mentioned technical solution are: 1. This utility model enables the disassembly of the middle bushing without disassembling the upper bushing and crank arm, etc. After disassembly, the seal and bearing can be replaced. After the seal and bearing are replaced, the middle bushing can be reinstalled through this device.

[0017] 2. The second through hole of this utility model is coaxial with the column and penetrates through the column. When reinstalling the central bushing, the screw can be better supported and limited through the second through hole penetrating the column. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 2 This is a schematic diagram showing the connection between this utility model and a hydraulic device during use.

[0021] Figure 3 This is a schematic diagram of the ring structure formed by the splicing of two arc-shaped seats in this utility model.

[0022] Figure 4 This is a schematic diagram of one embodiment of the arc-shaped seat in this utility model.

[0023] Figure 5 This is a schematic diagram of another embodiment of the arc-shaped seat in this utility model.

[0024] Figure 6 This is a schematic diagram of disassembling the guide vane bushing using this utility model.

[0025] Figure 7 This is a schematic diagram of the installation of the guide vane bushing using this utility model.

[0026] Figure label: 1. Central shaft sleeve; 2. Top cover; 3. Movable guide vane; 4. Upper cover plate; Upper arc plate 10, upper ear seat 11, upper ear hole 12, first bolt 13, first through hole 14, second through hole 15, protruding section 16; Lower arc plate 20, lower ear seat 21, lower ear hole 22, second bolt 23; Column 30; Screw 40; Hollow jack 50; 60-type perforated pressure sensor; Limiting device 70, nut 71, flat washer 72; Hydraulic device 80, hydraulic pump 81, distributor 82. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0029] Example 1: See Figure 1-5 A device for disassembling and assembling the guide vane bushing of a water turbine includes an arc-shaped seat, a screw 40, and a hollow jack 50. Multiple arc-shaped seats are provided, and these seats are assembled to form a ring structure. Each arc-shaped seat includes an upper arc plate 10, a lower arc plate 20, and columns 30. The upper arc plate 10 and the lower arc plate 20 are coaxially arranged. Multiple columns 30 are fixed between the upper arc plate 10 and the lower arc plate 20. The inner diameter of the upper arc plate 10 is smaller than the inner diameter of the lower arc plate 20, so that the inner circumference of the upper arc plate 10 exceeds that of the lower arc plate 20. The inner circumferential wall has an extended section 16, which is provided with multiple first through holes 14. The upper arc plate 10 and the lower arc plate 20 are also provided with multiple second through holes 15 on the same axis. In use, the screw 40 is used to pass through the first through hole 14 or the second through hole 15. The hollow jack 50 is fitted on the screw 40. The screw 40 is equipped with a limit device 70 at an adjustable position at the upper end of the hollow jack 50. The hollow jack 50 is used to push the screw 40 upward or press down the arc-shaped seat downward.

[0030] Combination Figure 6 , 7 This utility model enables the disassembly of the middle bushing 1 without disassembling the upper bushing and crank arm. After disassembly, the seal and bearing can be replaced. After the seal and bearing are replaced, the middle bushing can be reinstalled using this device.

[0031] See Figure 2 ,3 The upper arc plate 10 has upper ear seats 11 at both ends, each with an upper ear hole 12. The lower arc plate 20 has lower ear seats 21 at both ends, each with a lower ear hole 22. When multiple arc seats are assembled to form a ring structure, the upper ear seats 11 of adjacent upper arc plates 10 are connected and fixed by a first bolt 13, and the lower ear seats 21 of adjacent lower arc plates 20 are connected and fixed by a second bolt 23. Through the above structure, multiple upper arc plates 10 and multiple lower arc plates 20 can be spliced ​​together, thereby enabling multiple arc seats to be assembled to form a ring structure.

[0032] In this embodiment, see Figure 3 There are two upper arc plate 10 and two lower arc plate 20. That is, there are two arc-shaped seats.

[0033] In this embodiment, see Figure 1 The limiting device 70 includes a nut 71 and a flat washer 72. The flat washer 72 is fitted onto the screw 40, and the nut 71 is screwed onto the screw 40. The nut 71 is located on the upper side of the flat washer 72.

[0034] In this embodiment, see Figure 5 Multiple second through holes 15 are coaxially arranged on the upper arc plate 10 and the lower arc plate 20, and the second through holes 15 are located between adjacent columns 30.

[0035] See Figure 6 The first through hole 14 is used to insert the screw 40 when disassembling the central bushing 1.

[0036] See Figure 7 The second through hole 15 is used to insert the screw 40 when reinstalling the central bushing 1.

[0037] Example 2: The difference between this embodiment and Embodiment 1 is that, see [link to Embodiment 1] Figure 4 The second through hole 15 is coaxial with the column 30 and passes through the column 30. When reinstalling the central bushing 1, the screw 40 can be better supported and limited through the second through hole 15 passing through the column 30.

[0038] Example 3: Based on Embodiment 1 or Embodiment 2, a perforated pressure sensor 60 is further fitted onto the screw 40 between the limiting device 70 and the hollow jack 50. The perforated pressure sensor 60 is installed to detect the thrust of each screw 40 during the disassembly and installation of the central bushing. In use, the perforated pressure sensor 60 is electrically connected to a handheld force transmitter. The perforated pressure sensor 60 is prior art and can be purchased commercially.

[0039] Example 4: Based on Embodiment 1, Embodiment 2, or Embodiment 3, the number of hollow jacks 50 is matched with the number of screws 40, and multiple hollow jacks 50 are connected to a hydraulic device 80 via pipes. The hydraulic device 80 drives the hollow jacks 50 to extend.

[0040] In this embodiment, see Figure 2 The hydraulic device 80 includes a hydraulic pump 81 and a distributor 82. The pressure output end of the hydraulic pump 81 is connected to the input end of the distributor 82 via a pipe. The distributor 82 has multiple output ends, which are connected to the hollow jacks 50 via hydraulic hoses. By setting up the distributor 82, the pressure supply to each hollow jack 50 is balanced, thereby ensuring that the load is evenly distributed during the disassembly and installation of the central bushing.

[0041] Specifically, the hydraulic pump 81 is either an electric pump or a manual pump.

[0042] In this embodiment, there are four screws 40, therefore there are four hollow jacks 50. The distributor 82 has one input end and four output ends. The four output ends are connected to the hollow jacks 50 via hydraulic hoses to supply oil. The distributor 82 is also called a hydraulic synchronization valve, which enables one hydraulic pump 81 to simultaneously supply oil to the four hollow jacks 50.

[0043] The working principle or process of the utility model: When disassembling the center bushing 1, see Figure 6 With the upper arc plate 10 on top and the lower arc plate 20 on the bottom, the inner diameter of the lower arc plate 20 is larger than the outer diameter of the upper flange of the central bushing 1. The lower arc plate 20 is supported on the top cover 2. After the screw 40 passes through the first through hole 14, the lower end of the screw 40 is screwed into the threaded hole on the upper flange of the central bushing 1. After adjusting the limiting device 70, the operator operates the hydraulic pump 81 to pressurize the four hollow jacks 50 through the distributor 82. The hollow jacks 50 extend and push the limiting device 70 upward, thereby pushing the screw 40 upward, which in turn drives the central bushing 1 to rise horizontally. After the hollow jacks 50 are raised to their maximum height, the operator operates the four hollow jacks 50 to fall back to their original positions and rotates the limiting device 70 back to the lowest position against the hollow jacks 50. Then, the hydraulic pump 81 is operated repeatedly to raise the central bushing 1 until the central bushing 1 is completely pulled out.

[0044] After the central bushing 1 is pulled out, the seal and bearing on the central bushing 1 can be replaced. The seal is made by bonding sealing strips into a ring.

[0045] After replacing the seal and bearing shell, reinstall the intermediate bushing 1, see [link / reference]. Figure 7When reinstalling the central bushing 1, the arc-shaped seat is arranged in reverse, with the upper arc plate 10 at the bottom and the lower arc plate 20 at the top. The inner diameter of the upper arc plate 10 is less than or equal to the inner diameter of the upper flange of the central bushing 1. The upper arc plate 10 presses against the upper flange of the central bushing 1, and the four hollow jacks 50 are located on the lower arc plate 20. The limiting device 70 is adjusted so that the upper end of the screw 40 rests against the lower side of the upper cover plate 4. The operator operates the hydraulic pump 81 to pressurize the four hollow jacks 50 through the distributor 82, thereby pushing down the arc-shaped seat and moving the central bushing 1 downward until it reaches the maximum height of the hollow jacks 50. Then, the operator operates the four hollow jacks 50 to fall back to their original positions, and then adjusts the limiting device 70 so that the upper end of the screw 40 rests against the lower side of the upper cover plate 4. Then, the hydraulic pump 81 is operated to press down the central bushing 1 until the central bushing 1 is completely reinstalled.

[0046] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Any modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A device for disassembling and assembling the guide vane bushing of a water turbine, characterized in that: The structure includes an arc-shaped seat, a screw (40), and a hollow jack (50). Multiple arc-shaped seats are assembled to form a ring structure. The arc-shaped seat includes an upper arc plate (10), a lower arc plate (20), and columns (30). The upper arc plate (10) and the lower arc plate (20) are coaxially arranged. Multiple columns (30) are fixed between the upper arc plate (10) and the lower arc plate (20). The inner diameter of the upper arc plate (10) is smaller than the inner diameter of the lower arc plate (20) so that the inner circumference of the upper arc plate (10) has a protruding section (16) that extends beyond the inner circumferential wall of the lower arc plate (20). (16) is provided with multiple first through holes (14), and multiple second through holes (15) are provided coaxially on the upper arc plate (10) and the lower arc plate (20); when in use, the screw (40) is used to pass through the first through hole (14) or the second through hole (15), the hollow jack (50) is fitted on the screw (40), and a limit device (70) is installed on the screw (40) at an adjustable position at the upper end of the hollow jack (50). The hollow jack (50) is used to push the screw (40) upward or press down the arc seat.

2. The device for disassembling and assembling the guide vane bushing of a water turbine according to claim 1, characterized in that: The upper arc plate (10) is provided with upper ear seats (11) at both ends, and upper ear holes (12) are provided on the upper ear seats (11); the lower arc plate (20) is provided with lower ear seats (21) at both ends, and lower ear holes (22) are provided on the lower ear seats (21). When multiple arc seats are assembled to form a ring structure, the upper ear seats (11) of adjacent upper arc plates (10) are connected and fixed by the first bolt (13), and the lower ear seats (21) of adjacent lower arc plates (20) are connected and fixed by the second bolt (23).

3. A device for disassembling and assembling the guide vane bushing of a water turbine according to claim 1 or 2, characterized in that: The upper arc plate (10) and the lower arc plate (20) are each provided in twos.

4. The device for disassembling and assembling the guide vane bushing of a water turbine according to claim 1, characterized in that: A perforated pressure sensor (60) is also fitted on the screw (40) between the limiting device (70) and the hollow jack (50).

5. The device for disassembling and assembling the guide vane bushing of a water turbine according to claim 1, characterized in that: The limiting device (70) includes a nut (71) and a flat washer (72). The flat washer (72) is fitted on the screw (40), and the nut (71) is screwed on the screw (40). The nut (71) is located on the upper side of the flat washer (72).

6. The device for disassembling and assembling the guide vane bushing of a water turbine according to claim 1, characterized in that: The second through hole (15) is located between adjacent columns (30).

7. The device for disassembling and assembling the guide vane bushing of a water turbine according to claim 1, characterized in that: The second through hole (15) is coaxial with the column (30) and the second through hole (15) penetrates the column (30).

8. The device for disassembling and assembling the guide vane bushing of a water turbine according to claim 1, characterized in that: The number of hollow jacks (50) is matched with the number of screws (40), and multiple hollow jacks (50) are connected to the hydraulic device (80) through pipes.

9. A device for disassembling and assembling the guide vane bushing of a water turbine according to claim 8, characterized in that: The hydraulic device (80) includes a hydraulic pump (81) and a distributor (82). The pressure output end of the hydraulic pump (81) is connected to the input end of the distributor (82) through a pipe. The distributor (82) has multiple output ends. The output ends of the distributor (82) are connected to a hollow jack (50) through hydraulic hoses.

10. A device for disassembling and assembling the guide vane bushing of a water turbine according to claim 9, characterized in that: The hydraulic pump (81) is either an electric pump or a manual pump.

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