Method for measuring circumferential distribution of guide vane shaft holes of external water distribution ring of through-flow turbine
By designing and manufacturing optical instrument tools for measuring the shaft hole distribution of guide vanes with outer water distribution rings of the through-flow turbine, the problem that the accuracy of guide vane shaft hole distribution depends on equipment accuracy is solved, the measurement accuracy and fault tolerance are improved, and the risk of rework is reduced.
Patent Information
- Application Number
- CN202411707150.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-02-28
AI Technical Summary
The accuracy of the shaft hole distribution of the outer water distribution ring guide vane of the flow turbine depends on the equipment accuracy, and the error tolerance rate is low, which is prone to rework due to operation errors or poor equipment accuracy.
Two sets of measurement tools are designed and manufactured, and the distance between the characteristic points of the guide vane shaft hole to the round table busbar is accurately detected through optical instruments, and the distance between the measurement points of the adjacent two guide vane shaft holes is calculated to achieve accurate measurement of the circumference distribution of the guide vane shaft holes.
The accuracy and fault tolerance of the shaft hole distribution measurement of the outer water distribution ring guide vane are improved, the possibility of rework is reduced, and the flow water guide mechanism is guaranteed to be pre-installed and unnecessary costs are avoided.
Smart Images
Figure CN119533237A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of tubular turbines, and in particular to a method for measuring the circumferential distribution of guide vane shaft holes in an outer water distribution ring of a tubular turbine. Background Art
[0002] The outer water distribution ring of the tubular turbine is a key component of the unit's water guide mechanism. The guide vane shaft holes are evenly distributed on the cone of the outer water distribution ring. The guide vane shaft holes are generally at an angle of 60° to the center of the unit, and the angle between the centers of adjacent guide vane shaft holes and the cylindrical surface is 360° / n, where n is the number of guide vane shaft holes. The characteristic point of the guide vane shaft hole is the point where the inner spherical surface of the outer water distribution ring intersects the center of the guide vane shaft hole. It cannot be measured. The accuracy of the distribution of the guide vane shaft holes in the outer water distribution ring depends on the accuracy of the equipment, and the final verification is carried out before the water guide mechanism is pre-installed. This situation is completely dependent on the accuracy of the equipment, and the fault tolerance rate is very low. Operational errors or poor equipment accuracy or failure may lead to rework of the outer water distribution ring. Summary of the invention
[0003] In view of this, an object of the present invention is to provide a method for measuring the circumferential distribution of the guide vane shaft holes of the outer water distribution ring of a tubular turbine.
[0004] S1. Design and manufacture two sets of measuring tools, use optical instruments to accurately detect the distance from the characteristic point of the guide vane shaft hole to the generatrix of the frustum, and record the first measuring tool as l1 and the second measuring tool as l2;
[0005] S2. Number the guide vane shaft holes as 1#, 2#, 3#...n#, where n is the number of the guide vane shaft holes;
[0006] The first measuring tool and the second measuring tool are installed in the guide vane shaft holes S3, 1# and 2# respectively;
[0007] S4, using an internal micrometer to measure the distance between the first measuring tool and the second measuring tool parallel to the generatrix;
[0008] S5, remove the first measuring tool and install it into the 3# guide vane shaft hole, measure the 2# and 3# guide vane shaft holes according to S4, remove and install the measuring tool in sequence, and measure the parallel busbar distances of the remaining adjacent guide vane shaft holes after the measuring tool is installed according to S4;
[0009] S6. After data processing, the distance between the measuring points of two adjacent guide vane shaft holes is calculated and recorded to complete the measurement of the circumferential distribution of the guide vane shaft holes.
[0010] As a preferred embodiment, two sets of measuring tools are designed and manufactured in S1, the lower end of the measuring tool is the guide vane shaft hole installation positioning reference, which is a cylindrical section that fits with the guide vane shaft hole with a small gap, and the upper end is a convex spherical cone, the convex spherical surface is the convex spherical surface where the characteristic points of the guide vane shaft hole in the drawing are located, and is the positioning reference for the flow spherical surface of the outer water distribution ring. The 180° symmetrical generatrix angle of the cone is 360° / n, where n is the number of guide vane shaft holes. The design concept of this tool is to convert the distance between two points in the void at an angle of 360° / n between the centers of adjacent guide vane shaft holes that cannot be measured into the distance between two measurable parallel lines.
[0011] As a preferred embodiment, the guide vane shaft holes are numbered in the S2 in a clockwise manner starting from the upper side of the outer water distribution ring when viewed from the downstream side to the upstream side.
[0012] As a preferred implementation, the first measuring tool and the second measuring tool in S3 are respectively fixed firmly with C-type clamps after assembly. After assembly, it is checked that there is no gap between the convex spherical surface of the first measuring tool and the second measuring tool and the concave spherical surface of the outer water distribution ring, and the assembly of the measuring tools is completed.
[0013] As a preferred implementation, in S4, an internal micrometer is used to measure the minimum distance between the parallel generatrix of the first measuring tool and the second measuring tool. To eliminate measurement errors, two points are required to be measured, one above and one below, and recorded as l1-2-a and l1-2-b respectively. The average value is calculated and recorded as l1-2.
[0014] As a preferred implementation manner, in S5, the first measuring tool is removed and installed into the 3# guide vane shaft hole, and the 2# and 3# guide vane shaft holes are measured according to S4. The above steps are repeated to measure the parallel busbar distances of the remaining adjacent guide vane shaft holes after the measuring tools are assembled. Two points are measured above and below respectively, and the average value is calculated and recorded as l2-3, l3-4...ln-1-n, ln-1.
[0015] As a preferred implementation, in S6, data is processed to calculate the distance between the characteristic points of two adjacent guide vane shaft holes, and the calculation formula is La-b=l1+l2+la-b, wherein a and b are the numbers of the adjacent guide vane shaft holes, and l1 and l2 are the actual values of the distance from the measuring point of the measuring tool to the busbar, and records are made to complete the detection of the circumferential distribution of the guide vane shaft holes.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] The present invention is applicable to the processing of all external water distribution rings. The application of the present invention changes the current situation that the distribution of the shaft holes of the guide vanes of the external water distribution rings that cannot be measured depends on the accuracy of the equipment, improves the fault tolerance rate in the processing process, provides a strong guarantee for the qualified pre-installation of the through-flow water guide mechanism, avoids the quality problem of rework caused by the unqualified vertical and end positions of the pre-installed guide vanes of the water guide mechanism due to the position accuracy of the shaft holes of the guide vanes of the external water distribution rings, ensures the supply cycle, and avoids the occurrence of unnecessary costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is an overall schematic diagram of the outer water distribution ring of the present invention;
[0019] Figure 2 It is a cross-sectional schematic diagram of the outer water distribution ring of the present invention;
[0020] Figure 3 It is a schematic diagram of the structure of the special tooling for the guide vane shaft hole of the outer water distribution ring of the present invention;
[0021] Figure 4 It is a schematic diagram of assembling the special tooling for the guide vane shaft hole of the outer water distribution ring of the present invention.
[0022] Explanation of the markings in the figure: 1-1# guide vane shaft hole, 2-2# guide vane shaft hole, 3-inner circle of the guide vane shaft hole, 4-characteristic point of the guide vane shaft hole, 5-measuring point of the special tooling tool for the guide vane shaft hole of the external water distribution ring corresponding to the characteristic point of the guide vane shaft hole, 6-distance from the measuring point of the special tooling tool for the guide vane shaft hole of the external water distribution ring to the generatrix of the truncated cone, 7-overlapping measuring points and characteristic points after the measuring tool is assembled, 8-characteristic dimensions of the circumferential distribution of the guide vane shaft hole, 9-parallel generatrix distance of the special tooling tool for measuring the inside diameter micrometer, 10-angle between the center lines of adjacent guide vane shaft holes. DETAILED DESCRIPTION
[0023] In order to make the technical solutions and beneficial effects of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings.
[0024] Specific implementation method 1: refer to Figures 1 to 4 The detection method of the present invention is described as a method for measuring the circumferential distribution of the guide vane shaft holes of the outer water distribution ring of a tubular turbine, which specifically includes the following steps:
[0025] S1. Design and manufacture two sets of measuring tools, use optical measuring instruments to accurately detect the distance 6 from the measuring point 5 of the measuring tool to the generatrix of the frustum, and record the first measuring tool as l1 and the second measuring tool as l2;
[0026] S2. Number the guide vane shaft holes as 1#, 2#, 3#...n#, where n is the number of the guide vane shaft holes;
[0027] S3, 1# guide vane shaft hole 1, 2# guide vane shaft hole 2 are respectively equipped with a first measuring tool and a second measuring tool;
[0028] S4, using an internal micrometer to measure the distance 9 between the parallel generatrix of the first measuring tool and the second measuring tool;
[0029] S5, remove the first measuring tool and install it into the 3# guide vane shaft hole, measure the 2# and 3# guide vane shaft holes according to S4, remove and install the measuring tool in sequence, and measure the parallel busbar distance 9 of the remaining adjacent guide vane shaft holes after the measuring tool is installed according to S4;
[0030] S6. After data processing, the distances 8 between the characteristic points of all two adjacent guide vane shaft holes are calculated and recorded to complete the circumferential distribution of the guide vane shaft holes.
[0031] In this embodiment, a measuring tool is designed and manufactured, and the 1# guide vane shaft hole 1 and the 2# guide vane shaft hole 2 are assembled and measured in sequence. Figure 4 , the parallel generatrix distance of the measuring tool is measured by an internal diameter micrometer 9, which is generally applicable to the measurement of the circumferential distribution of the guide vane shaft hole during the processing of the external water distribution ring of the cross-flow unit.
[0032] Specific implementation method 2: refer to Figure 1 , Figure 2 , Figure 3 This embodiment further defines S1 described in the first embodiment. In this embodiment, the measuring tool is designed and manufactured in S1. Figure 1 , Figure 2 The distribution of the guide vane shaft hole of the outer water distribution ring and the size of the guide vane shaft hole 3, the spherical size of the guide vane shaft hole characteristic point 4, the design and manufacture of the measurement tool structure that can accurately locate and measure the guide vane shaft hole of the outer water distribution ring, see Figure 3 The lower end of the measuring tool is the guide vane shaft hole installation positioning reference, which is a cylindrical section with a small gap with the guide vane shaft hole 3, and the upper end is a convex spherical cone. The convex spherical surface is the convex spherical surface where the characteristic point 4 of the guide vane shaft hole in the drawing is located. It is the positioning reference for the flow spherical surface of the outer water distribution ring. The 180° symmetrical generatrix angle of the cone is 360° / n, where n is the number of guide vane shaft holes. The design concept of this tool is to convert the distance between two points in the void at an angle of 360 / n between the centers of adjacent guide vane shaft holes that cannot be measured into the distance between two measurable parallel lines 9.
[0033] Specific implementation method three, refer to Figure 1 To explain this embodiment, this embodiment further limits S2 described in the first embodiment, and the numbers are sequentially numbered clockwise from the upper side of the outer water distribution ring when looking down from the downstream side to the upstream side, 1#, 2#...n-1, n, where n is the number of guide vane shaft holes.
[0034] The numbering rule in this embodiment is applicable to the numbering of the distribution holes of all the parts of the crossflow unit. The unified numbering rule is conducive to archiving technical documents and querying information.
[0035] Specific implementation method 4: refer to Figure 4 This embodiment is described. This embodiment further limits S3 described in the first embodiment. In this embodiment, the first measuring tool and the second measuring tool are installed in the 1# guide vane shaft hole 1 and the 2# guide vane shaft hole 2 respectively.
[0036] In this embodiment, the first measuring tool and the second measuring tool are firmly fixed with C-type clamps after assembly. After assembly, it is checked that there is no gap between the convex spherical surface of the first measuring tool and the second measuring tool and the concave spherical surface of the outer water distribution ring, indicating that the characteristic point 4 of the guide vane shaft hole and the tool measurement point 5 coincide with each other to form 7, and the assembly of the measuring tool is completed.
[0037] Specific implementation method five: refer to Figure 4 This embodiment further defines S4 described in the first embodiment. In this embodiment, an internal micrometer is used to measure the Figure 4 The minimum distance between the first measuring tool and the second measuring tool parallel to the generatrix is 9. In order to eliminate the measurement error, it is required to measure two points above and below, which are recorded as l1-2-a and l1-2-b respectively, and the average value is calculated and recorded as l1-2.
[0038] In this embodiment, the deviation between the two measurement results should be very small. If a large deviation occurs, it is necessary to check whether the tool is installed properly.
[0039] Specific implementation method six: refer to Figure 2 This embodiment is described, and this embodiment further limits S5 described in the specific embodiment 1. In this embodiment, the first measuring tool is disassembled and installed in the 3# guide vane shaft hole, and the 2# and 3# guide vane shaft holes are measured according to S4. The measuring tools are disassembled and installed in sequence, and the parallel generatrix distances of the remaining adjacent guide vane shaft holes after the measuring tools are installed are measured in sequence according to S4.
[0040] In this embodiment, the parallel generatrix distances of the remaining adjacent guide vane shaft holes after the measuring tool is assembled are measured in sequence, two points are measured above and below, and the average value is calculated and recorded. l2-3, l3-4...ln-1-n, ln-1. This is part of the data for calculating the circumferential distribution of the guide vane shaft holes in S6.
[0041] Specific implementation method seven: refer to Figure 3 , Figure 4This embodiment is described, and this embodiment further limits S6 described in the specific embodiment 1. In this embodiment, after data processing, S6 described in the above embodiment calculates the distance 8 between the characteristic points of two adjacent guide vane shaft holes, and the calculation formula is La-b=l1+l2+la-b, where a and b are the numbers of the adjacent guide vane shaft holes, and l1 and l2 are the actual values of the distances from the measuring points of the first measuring tool and the second measuring tool to the busbar, and records are made to complete the detection of the circumferential distribution of the guide vane shaft holes.
[0042] Finally, the protection scope of the present invention is not limited to the above-mentioned embodiments. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope and spirit of the present invention. If these changes and modifications fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these changes and modifications.
Claims
1. A method for measuring the circumferential distribution of the guide vane shaft holes of the outer water distribution ring of a tubular turbine, characterized by comprising the following steps: S1. Design and manufacture two sets of measuring tools, use optical instruments to accurately detect the distance from the measuring point of the measuring tool to the generatrix of the frustum, and record the first measuring tool as l1 and the second measuring tool as l2; S2. Number the guide vane shaft holes as 1#, 2#, 3#...n#, where n is the number of the guide vane shaft holes; The first measuring tool and the second measuring tool are installed in the guide vane shaft holes S3, 1# and 2# respectively; S4. Use an internal micrometer to measure and record the distance between the first measuring tool and the second measuring tool parallel to the generatrix; S5, remove the first measuring tool and install it into the 3# guide vane shaft hole, measure the 2# and 3# guide vane shaft holes according to S4, remove and install the measuring tool in sequence, measure the parallel busbar distances of the remaining adjacent guide vane shaft holes after the measuring tool is installed according to S4, and record them; S6. After data processing, the distance between the measuring points of two adjacent guide vane shaft holes is calculated and recorded, completing the precise measurement of the circumferential distribution of the guide vane shaft holes.
2. A method for measuring the circumferential distribution of guide vane shaft holes in the outer water distribution ring of a tubular turbine according to claim 1, characterized in that: The S1 is designed and manufactured with two sets of measuring tools. The lower end of the measuring tool is the guide vane shaft hole installation positioning reference, which is a cylindrical section that matches the guide vane shaft hole with a small gap. The upper end is a convex spherical cone. The convex spherical surface is the convex spherical surface where the characteristic point of the guide vane shaft hole in the drawing is located. It is the positioning reference for the flow spherical surface of the outer water distribution ring. The 180° symmetrical generatrix angle of the cone is 360° / n, where n is the number of guide vane shaft holes.
3. The method for measuring the circumferential distribution of the guide vane shaft holes of the outer water distribution ring of a tubular turbine according to claim 1, characterized in that: In the above S2, the guide vane shaft holes are numbered sequentially starting from the upper side of the outer water distribution ring in a clockwise direction from the downstream side to the upstream side in a top view.
4. The method for measuring the circumferential distribution of the guide vane shaft holes of the outer water distribution ring of a tubular turbine according to claim 1, characterized in that: In S3, the first measuring tool and the second measuring tool are respectively fixed firmly with C-type clamps after assembly. After assembly, it is checked that there is no gap between the convex spherical surface of the first measuring tool and the second measuring tool and the concave spherical surface of the outer water distribution ring, and the assembly of the two sets of measuring tools is completed.
5. The method for measuring the circumferential distribution of the guide vane shaft holes of the outer water distribution ring of a tubular turbine according to claim 1, characterized in that: In S4, an internal micrometer is used to measure the minimum distance between the parallel generatrix of the first measuring tool and the second measuring tool. To eliminate the measurement error, two points are measured, one above the other, and recorded as l1-2-a and l1-2-b, respectively. The average value is calculated and recorded as l1-2.
6. The method for measuring the circumferential distribution of the guide vane shaft holes of the outer water distribution ring of a tubular turbine according to claim 1, characterized in that: In S5, the first measuring tool is removed and installed into the 3# guide vane shaft hole, and the 2# and 3# guide vane shaft holes are measured according to S4. The above steps are repeated to measure the parallel generatrix distances of the remaining adjacent guide vane shaft holes after the measuring tools are installed. Two points are measured above and below respectively, and the average value is calculated and recorded as l2-3, l3-4...ln-1-n, ln-1.
7. The method for measuring the circumferential distribution of the guide vane shaft holes of the outer water distribution ring of a tubular turbine according to claim 1, characterized in that: In S6, after data processing, the distance between the characteristic points of two adjacent guide vane shaft holes is calculated, and the calculation formula is La-b=l1+l2+la-b, where a and b are the numbers of the adjacent guide vane shaft holes, l1 and l2 are the actual values of the distance from the measuring point of the measuring tool to the busbar, and records are made to complete the detection of the circumferential distribution of the guide vane shaft holes.