Bulb-type turbine runner chamber and outer guide ring pin hole fitting tool

Abstract

This application discloses a tool for fitting pins between the impeller chamber and the outer guide ring of a bulb-type turbine generator set. Its features include a base plate, with support plates fixedly connected to the left and right sides of the front end of the base plate, and a lateral orientation adjustment component fixedly connected to the inner side of the support plates. A fixing block is fixedly connected to the front bottom of the base plate, and a first bolt is provided on the fixing block. A fixing plate is fixedly connected to the bottom of the base plate, and a fixing hole for installing a second bolt is opened at the front end of the fixing plate. It also includes an auxiliary adjustment component, which includes an auxiliary pressure rod. The left rear end of the auxiliary pressure rod contacts the support plate, and the front end of the auxiliary pressure rod has a first adjustment hole for installing a third bolt along its length. A second adjustment hole for installing a fourth bolt is opened to the right of the first adjustment hole. This utility model can accurately locate the drilling position.

Description

Technical Field

[0001] This application relates to the field of water turbine technology, and in particular to a tool for fitting pins to the runner chamber and outer guide ring pin holes of a bulb-type turbine unit. Background Technology

[0002] The retrofitting of bulb turbine units is a systematic project aimed at improving the unit's performance, reliability, automation level, and safety.

[0003] After efficiency-enhancing and capacity-expanding modifications (such as replacing the impeller or movable guide vanes), the position of the impeller chamber needs to be adjusted to meet the clearance requirements of the modified components. This will cause deviations in the positioning pin holes between the impeller chamber and the outer guide ring. Similarly, the inner guide ring needs to be repositioned according to the center of the main shaft, which will also cause deviations in its alignment with the pin holes on the tubular seat connecting plate. Therefore, all these misaligned pin holes must be re-drilled. However, existing pin drilling tools are mostly standard equipment and cannot be flexibly adjusted. In addition, the structural types of different power plant units vary, making it difficult for the tools to adapt to actual positional changes on site and ensuring the machining accuracy of the new pin holes. Utility Model Content

[0004] The technical problem to be solved by this application is to provide a tool for matching the rotor chamber and the outer guide ring pin hole of a bulb-type turbine generator set, so as to solve the problem of how to locate the drilling position.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution: The bulb-type turbine's impeller chamber and outer guide ring pin hole fitting tool includes a base plate, with support plates fixedly connected to the left and right sides of the front end of the base plate, and a lateral orientation adjustment component fixedly connected to the inner side of the support plate; a fixing block is fixedly connected to the front bottom of the base plate, and a first bolt is provided on the fixing block; a fixing plate is fixedly connected to the bottom of the base plate, and a fixing hole for installing a second bolt is opened at the front end of the fixing plate. It also includes an auxiliary adjustment component, which includes an auxiliary pressure rod. The left rear end of the auxiliary pressure rod contacts the support plate, and the front end of the auxiliary pressure rod has a first adjustment hole for installing a third bolt along its length. A second adjustment hole for installing a fourth bolt is provided on the right side of the first adjustment hole.

[0006] In order to ensure that the support plate can contact the end face of the turbine chamber, in some embodiments, the top of the support plate is higher than the top of the base plate.

[0007] In some embodiments, the front end face of the support plate is provided with a screw hole for installing a fifth bolt, and the screw hole is located above the base plate.

[0008] In some embodiments, the lateral orientation adjustment assembly includes a side plate perpendicular to the support plate, and a sixth bolt is provided on the side plate. The threaded portion of the sixth bolt passes through the side plate, and its threaded end faces inward. This addresses the problem of how to limit the lateral movement of the magnetic drill.

[0009] In some embodiments, the threaded portion of the first bolt is arranged facing upwards.

[0010] This embodiment also provides a method for using a tool to align the rotor chamber and outer guide ring pin hole of a bulb-type turbine, including the following steps. Step 1: Place the base plate on the front end face of the outer guide ring, align the fixing holes of the fixing plate with at least two bolt holes on the front end face of the outer guide ring, and at the same time, make the top rear end of the support plate contact the front end face of the wheel chamber. Step 2: Pass the second bolt through the fixing hole and screw it into the corresponding bolt hole of the outer guide ring, thereby fixing the base plate and the support plate onto the outer guide ring and the wheel chamber respectively. Screw the fifth bolt into the screw hole on the support plate beforehand. Step 3: Install auxiliary adjustment components on the left and right sides of the front end of the base plate. Place the auxiliary pressure rod against the front end of the support plate, aligning its first adjustment hole with another bolt hole on the outer guide ring. Pass the third bolt through the first adjustment hole and screw it into that bolt hole. Then screw the fourth bolt into the second adjustment hole, ensuring its threaded end contacts the outer guide ring for support (the distance from the outer guide ring to the first adjustment hole is smaller than the distance to the second adjustment hole). Tighten the third bolt to press the auxiliary pressure rod against the front end of the support plate, further securing it to the impeller chamber. Step 4: Attach the magnetic end of the magnetic drill to the base plate and position the drill bit above the base plate. After confirming that the center of the drill bit is aligned with the center of the hole to be drilled, screw the threaded part of the sixth bolt on the inner side of the two support plates inward until it contacts the left and right ends of the magnetic drill and tightens it to restrict the lateral movement of the magnetic drill. Screw the first bolt upward so that its threaded part connects with the threaded hole at the bottom of the magnetic drill and locks it to restrict the longitudinal movement of the magnetic drill. Step 5: Measure the perpendicularity of the drill bit to the end face of the hole to be drilled. If there is a deviation, tighten or loosen the third bolt on one side, and use the auxiliary pressure rod to push the support plate and base plate to deflect slightly. If the perpendicularity of the drill bit to the end face of the hole to be drilled is greater than 90°, the direction of the slight deflection is that the support plate and base plate swing towards the impeller chamber until the drill bit is perpendicular to the end face; or rotate the fifth bolt so that its threaded end presses against the impeller chamber and continue to rotate, so that the support plate moves towards the nut of the fifth bolt. Then tighten the third bolt on one side, and use the auxiliary pressure rod to push the support plate and base plate to deflect slightly. If the perpendicularity of the drill bit to the end face of the hole to be drilled is less than 90°, the direction of the slight deflection is that the support plate and base plate swing away from the impeller chamber until the drill bit is perpendicular to the end face; after confirming that all bolts are tightened, drilling can be carried out.

[0011] Compared to existing technologies, this application achieves at least the following beneficial effects: This pin-fitting tool connects the outer guide ring and the impeller chamber into a single unit via a base plate and a support plate. Its workflow involves pre-positioning, installing the magnetic drill, and then adjusting the perpendicularity of the drill bit to the end face of the hole to be drilled. This design reduces offset during drilling, thus achieving both precise positioning and efficient operation. After installing the magnetic drill, the lateral position of the drill bit can be flexibly adjusted via the lateral orientation adjustment component, solving the problem of micro-adjustment. Furthermore, considering the varying structures of different power plant units, this tool can adapt to different bolt hole distributions on the front face of the outer guide ring and impeller chamber by adjusting its own installation position, demonstrating strong adaptability. Attached Figure Description

[0012] One or more embodiments of this application will now be described by way of example only with reference to the accompanying drawings, in which: Figure 1 This is a front view of the rotor chamber and outer guide ring pin hole fitting tool of a bulb-type turbine unit according to one embodiment of this application; Figure 2 for Figure 1 A top view of the distribution tool in the embodiment.

[0013] The numbers in the diagram are as follows: 1. Base plate; 2. Sixth bolt; 3. Side plate; 4. Support plate; 41. Screw hole; 5. Auxiliary pressure rod; 51. First adjustment hole; 52. Second adjustment hole; 6. First nut; 7. First screw; 8. Fourth bolt; 9. Fixing plate; 91. Fixing hole; 10. Second bolt; 11. Fixing block; 12. First bolt. Detailed Implementation

[0014] The present application will now be described in detail with reference to exemplary embodiments shown in the accompanying drawings. However, it should be understood that the present application may be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided herein to make the disclosure of the present application more complete and to fully convey the concept of the present application to those skilled in the art.

[0015] In the description of this application, it should be understood that the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 application 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 limiting the scope of protection of this application.

[0016] To address the inconvenience of pin location positioning in existing technologies, the inventors, after careful analysis, discovered that the main reason for this problem is: First, most existing drilling and pinning tools are integral or rigid structures manufactured to standard dimensions. These tools were designed for new unit installations or standardized interfaces, and their positioning holes, clamping positions, and guiding mechanisms are all of fixed dimensions, lacking multi-dimensional precision adjustment functions (such as fine-tuning mechanisms for lateral, longitudinal, vertical, and angular deflection). When the pin hole deviates by even a few millimeters, operators can only make rough adjustments using primitive methods such as adding shims, forcibly enlarging the hole, or gas cutting. This is not only inefficient but also introduces secondary errors, severely compromising the equipment's alignment accuracy.

[0017] Secondly, different power plants, and even different generating units within the same power plant, exhibit significant structural differences due to variations in their commissioning dates, design units, manufacturers, and historical modifications. This is specifically reflected in the vastly different key dimensions, such as the thickness of the impeller chamber flange, the diameter of the bolt hole distribution circle on the outer guide ring, and the elevation angle of the tubular seat connection plate. Standard tools cannot be universally applicable; their clamping range, span, and installation interfaces often do not match the actual dimensions on site, making installation impossible or impossible to securely fix. Under conditions of insufficient rigidity, high-precision drilling inevitably results in drill bit vibration and deviation.

[0018] In summary, there is a certain contradiction between standard, rigid tools and the non-standard, ever-changing needs of the field. The non-adjustability of the tools, combined with the variability and uncertainty of the unit structure, makes them unable to adapt to actual positional changes caused by on-site modifications. New pin holes machined using such tools cannot guarantee concentricity, perpendicularity, and positional accuracy, failing to meet high-standard installation requirements and posing potential risks to the long-term safe and stable operation of the unit.

[0019] Based on the above analysis, the inventor designed a distribution tool.

[0020] like Figure 1 and Figure 2As shown, in one embodiment of the pin fitting tool for the bulb-type turbine rotor chamber and outer guide ring pin hole of this application, a base plate 1 made of rectangular steel plate is included. The base plate 1 is used to install on the front end face of the outer guide ring. Since the front end face of the outer guide ring may be uneven, the base plate 1 with high flatness is used as a reference, so that the magnetic drill used for drilling the pin hole can be stably attached to it. A support plate 4 made of rectangular steel plate is welded to each of the left and right sides of the front end of the base plate 1. These support plates 4 are arranged vertically. A lateral orientation adjustment component is fixedly connected to the inner side of the support plate 4. This component is used to adjust and fix the lateral position of the magnetic drill. A fixing block 11 made of rectangular steel plate is welded to the front end of the bottom of the base plate 1. The top surface of the fixing block 11 has a screw hole, and a first bolt 12 is screwed into the screw hole. A rectangular steel fixing plate 9 is also welded laterally to the bottom of the base plate 1. The front end of the fixing plate 9 has a mounting hole for a second bolt 10.

[0021] This pin-fitting tool also includes an auxiliary adjustment assembly, which is distributed on the left and right sides of the base plate 1. This assembly includes an auxiliary pressure rod 5 with a channel steel structure. The opening of the auxiliary pressure rod 5 faces the support plate 4, and its left rear end contacts the support plate 4 (taking the auxiliary pressure rod 5 distributed on the right side of the base plate 1 as an example). The front end of the auxiliary pressure rod 5 has a first adjustment hole 51 for installing a third bolt along its length. The first adjustment hole 51 has a certain length. To the right of the first adjustment hole 51, on the auxiliary pressure rod 5, a second adjustment hole 52 is also provided for installing a fourth bolt 8 (this second adjustment hole 52 can be a threaded hole, or it can be made by welding a nut into a smooth hole).

[0022] The support plate 4 is used to contact the end face of the rotary chamber, thereby confining the drill bit within the working area between the two support plates 4 and above the base plate 1 after the magnetic drill is installed, and adjusting the coplanarity of the base plate and the outer guide ring (or the perpendicularity of the magnetic drill's outer guide ring). To achieve this effect, the top height of the support plate 4 must exceed the top of the base plate 1, and a screw hole is provided at the front end of the support plate 4, located above the base plate 1. A fifth bolt (not shown) is pre-screwed into the screw hole.

[0023] The lateral orientation adjustment assembly is used to fine-tune and lock the lateral position of the magnetic drill. It includes a side plate 3 welded perpendicularly to the support plate 4, with the side plate 3 welded to the inner side of the support plate 4 (i.e., the side facing the center of the base plate 1). The side plate 3 has at least two equally spaced threaded holes, each housing a sixth bolt 2. The threaded portion of the sixth bolt 2 passes through the side plate 3, with the threaded end facing inward. The two bolts balance the force applied to the side of the magnetic drill, preventing it from wobbling or rotating. Alternatively, the side plate 3 can be replaced with a nut, with the side of the nut welded to the inward-facing front end of the support plate 4.

[0024] During adjustment, first attach the magnetic drill to the base plate 1. If you need to adjust the magnetic drill to move to the right, screw in the sixth bolt 2 on the left side plate 3 and push the magnetic drill to the right; conversely, screw it in to move it to the right. After the position is adjusted, screw in the sixth bolts 2 on both sides, with their threaded ends pressing against both sides of the magnetic drill to restrict its lateral movement and achieve fixation.

[0025] The screw portion of the first bolt 12 is positioned upwards. Magnetic drills typically have a countersunk hole at the bottom for self-fixation (either built-in or machined later) or a downward-protruding flange. After fixing the magnetic drill's lateral position as described above, screw the screw portion of the first bolt 12 into the corresponding countersunk hole at the bottom of the magnetic drill. If the drill's bottom has a flange, tighten the first bolt 12 upwards, using the bolt head and the base plate 1 to clamp the flange. This method prevents the magnetic drill from slipping towards the front end of the base plate 1 (i.e., the operator's direction) due to reaction force during drilling.

[0026] The first bolt 12, the second bolt 10, the fourth bolt 8, and the fifth bolt are all long bolts.

[0027] This embodiment also provides a method for using the above-mentioned distribution tool, including the following steps: 1. Place the base plate 1 on the front end face of the outer guide ring and adjust its position. Align the fixing holes 91 of the fixing plate 9 with at least two existing bolt holes on the front end face of the outer guide ring, and simultaneously ensure that the rear top side of the support plate 4 contacts the front end face of the impeller chamber. The purpose of this step is to initially determine the positioning positions of the base plate 1 and the support plate 4.

[0028] 2. Pass the second bolt 10 through the fixing hole 91 and screw it into the corresponding bolt hole of the outer guide ring. At least two second bolts 10 should be placed on the left and right sides of the fixing hole 91 respectively to balance the base plate 1 and prevent it from rotating. At this point, the base plate 1 and the support plate 4 are respectively fixed to the front end faces of the outer guide ring and the wheel chamber. The fifth bolt should be pre-screwed into the screw hole on the support plate for later use.

[0029] 3. Install auxiliary adjustment components on the left and right sides of the front end of the base plate 1. Place the end of the auxiliary pressure rod 5 facing the base plate 1 against the front end face of the support plate 4, aligning its first adjustment hole 51 with another bolt hole on the outer guide ring (since the bolt holes on the outer guide ring are generally circumferentially shaped, the first adjustment hole 51 on the auxiliary pressure rod 5 needs to be angled to match the position of another available bolt hole on the outer guide ring). Pass the third bolt through the first adjustment hole 51 and screw it into the bolt hole. The third bolt consists of a first nut 6 and a first screw 7 (a double-ended screw can be used). First, screw the first screw 7 into the target bolt hole of the outer guide ring and tighten it. Then, fit the first adjustment hole 51 of the auxiliary pressure rod 5 onto the first screw 7. Finally, screw the first nut 6 onto the first screw 7 to press down the auxiliary pressure rod 5, so that the end of the auxiliary pressure rod 5 in contact with the support plate 4 firmly fixes the support plate 4. Next, screw the fourth bolt 8 into the second adjusting hole 52 (a threaded through hole) of the auxiliary pressure rod 5 and tighten it downwards so that its threaded end abuts against the surface of the outer guide ring or related structure, thereby supporting the end of the auxiliary pressure rod 5 away from the support plate 4. At this point, the auxiliary pressure rod 5 is securely installed.

[0030] 4. Attach the magnetic end of the magnetic drill to the base plate 1, and position the drill bit in the working area between the two support plates 4 and above the base plate 1. After ensuring the center of the drill bit is aligned with the center of the hole to be drilled, screw the threaded portion of the sixth bolt 2 on the inner side of the two support plates 4 inwards until it contacts the left and right ends of the magnetic drill and tightens it to restrict the lateral movement of the magnetic drill. Then, screw in the first bolt 12. If there is a threaded hole at the bottom of the drill, screw the first bolt 12 into it; if there is a flange, screw the first bolt 12 up to clamp the flange. Lock the magnetic drill with the first bolt 12 to restrict its longitudinal movement and prevent reverse slippage during drilling.

[0031] 5. Since the outer guide ring and the surface of the rotating chamber are non-finished and painted, there may be some unevenness or tilt. When measuring the perpendicularity of the drill bit to the end face of the hole to be drilled, if there is a deviation, such as the perpendicularity of the drill bit to the end face of the hole to be drilled being greater than 90° (the drill bit is tilted backward), there will be a gap between the support plate 4 and the end face of the rotating chamber. On the premise of ensuring that the threaded end of the fifth bolt does not contact the end face of the rotating chamber, tighten the first nut 6 on the first screw 7 of the auxiliary pressure rod 5. The auxiliary pressure rod 5 will swing slightly towards the rotating chamber with the second adjustment hole 52 as the axis. From the side, the auxiliary pressure rod 5 will push the support plate 4 and the base plate 1 to deflect towards the rotating chamber. Adjust the drill bit to be perpendicular to the end face. If the perpendicularity between the drill bit and the end face of the hole to be drilled is less than 90° (the drill bit is tilted forward), slightly loosen the first nut 6 on the first screw 7 of the auxiliary pressure rod 5, and then rotate the fifth bolt. After its threaded end presses against the wheel chamber, continue rotating, causing the support plate 4 to move the base plate 1 towards the nut of the fifth bolt. At this time, there is a gap between the base plate 4 and the outer guide ring. Then tighten the first nuts 6 on the first screw 7 of the auxiliary pressure rods 5 on both sides of the base plate 1. From the side, the auxiliary pressure rod 5 pushes the connection point between the support plate 4 and the base plate 1, causing the base plate 1 to deflect in the opposite direction towards the end face of the outer guide ring, until the drill bit is perpendicular to the end face. After confirming that all bolts are tightened, drilling can begin.

[0032] After measuring the verticality, if there are gaps between the support plate 4 and the wheel chamber, or between the base plate 1 and the outer guide ring, suitable copper pads can be inserted.

[0033] When measuring perpendicularity, the angle between the drill bit and the end face can be measured indirectly instead of directly. That is, the parallelism between the support plate 4 and the wheel chamber (whether the support plate and the wheel chamber are parallel) and the parallelism between the base plate 1 and the outer guide ring (whether the base plate and the outer guide ring are parallel) are measured and compared.

[0034] If the parallelism deviation between the support plate 4 and the wheel chamber is greater than the parallelism deviation between the base plate 1 and the outer guide ring, it indicates that the perpendicularity between the drill bit and the end face is greater than 90° (the drill bit is tilted backward). It should be adjusted in the manner described above, where the perpendicularity between the drill bit and the end face of the hole to be drilled is greater than 90°. Conversely, if the parallelism deviation between the support plate 4 and the wheel chamber is less than the parallelism deviation between the base plate 1 and the outer guide ring, it indicates that the perpendicularity is less than 90° (the drill bit is tilted forward). It should be adjusted in the manner described above, where the perpendicularity between the drill bit and the end face of the hole to be drilled is less than 90°.

[0035] The specific operating method depends on the specific circumstances.

[0036] It should be understood that all the above embodiments are exemplary and not restrictive. Various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of this application should be within the protection scope of this application.

Claims

1. A tool for fitting the rotor chamber and outer guide ring pin hole of a bulb-type turbine generator set, characterized in that, The base plate includes a support plate fixedly connected to the left and right sides of the front end of the base plate, and a lateral orientation adjustment component fixedly connected to the inner side of the support plate; a fixing block is fixedly connected to the front bottom of the base plate, and a first bolt is provided on the fixing block; a fixing plate is fixedly connected to the bottom of the base plate, and a fixing hole for installing a second bolt is opened at the front end of the fixing plate. It also includes an auxiliary adjustment component, which includes an auxiliary pressure rod. The left rear end of the auxiliary pressure rod contacts the support plate, and the front end of the auxiliary pressure rod has a first adjustment hole for installing a third bolt along its length. A second adjustment hole for installing a fourth bolt is provided on the right side of the first adjustment hole.

2. The tool according to claim 1, characterized in that, The top of the support plate is higher than the top of the base plate.

3. The tool according to claim 2, characterized in that, The front end face of the support plate has a screw hole for installing the fifth bolt, and the screw hole is located above the base plate.

4. The tool according to claim 1, characterized in that, The lateral orientation adjustment assembly includes a side plate that is perpendicular to the support plate. A sixth bolt is provided on the side plate, with the bolt's threaded end penetrating the side plate and its threaded end facing inward.

5. The tool according to claim 1, characterized in that, The threaded portion of the first bolt is arranged facing upwards.

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