Composite method for axial flow water turbine blades

Abstract

The application relates to a composite method for an axial flow type water turbine paddle, and comprises the following steps: A. placing the paddle on a composite auxiliary tool; B. taking a reference notch on the front side as a starting point to vertically draw a first A-point reference line upward; C. drawing an extension line along the slope of an auxiliary slope plate on the front side as a second A-point reference line, and the intersection point of the second A-point reference line and the first A-point reference line is projected on the edge of the paddle as an A-point; D. taking a reference notch on the rear side as a starting point to vertically draw a first B-point reference line upward; E. drawing an extension line along the slope of an auxiliary slope plate on the rear side as a second B-point reference line, and the intersection point of the second B-point reference line and the first B-point reference line is projected on the edge of the paddle as a B-point; F. connecting the A-point and the B-point as a rotation axis line of the paddle, and drawing an extension line along the slope of the auxiliary slope plate to project on the edge of the paddle as an installation angle line; G. rotating the paddle around the rotation axis line until the installation angle line is horizontal; and H. welding the paddle to a hub.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water turbine processing technology, in particular to a composite method of an axial flow water turbine paddle. BACKGROUND

[0002] In the axial flow water turbine, the paddle is the main component of the water turbine runner and is the core component. The paddle is designed according to the hydraulic characteristics, the paddle is complex and twisted in space, and the cross-sectional shape is wing-shaped. It is the main component of water flow energy conversion and is the most difficult component to process. The processing quality and precision have a direct impact on the efficiency and other hydraulic properties of the hydro-generator.

[0003] When the paddle is combined with the hub, the rotational axis of the paddle is taken as the reference, and the paddle is welded to the hub at the required angle after being rotated to the required angle. Since the paddle is a special-shaped part, the theoretical and actual installation angles are inconsistent, so it is difficult to determine the state of the paddle during installation. At present, the installation state of the paddle is determined by measuring and calculating a large amount of measurement tools, which is not only time-consuming and laborious, but also has low production efficiency. SUMMARY

[0004] The present application aims to provide a composite method of an axial flow water turbine paddle to solve the problem of large workload and low efficiency of the existing method.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme:

[0006] The composite method of the axial flow water turbine paddle adopts a composite auxiliary tool, including the following steps:

[0007] A. Place the paddle with the front face upward on the composite auxiliary tool so that the points on the diagonal line of the paddle are at the same height; B. Take the reference notch on the front side of the composite auxiliary tool as the starting point, and vertically upwardly draw a first A point reference line. Fix an A point process block at the intersection of the first A point reference line and the front side edge of the paddle. Draw an extension line along the slope of the auxiliary slope plate on the front side of the composite auxiliary tool as a second A point reference line. The intersection of the second A point reference line and the first A point reference line is projected onto the A point process block as an A point;

[0008] C. Take the reference notch on the rear side of the composite auxiliary tool as the starting point, and vertically upwardly draw a first B point reference line. Fix a B point process block at the intersection of the first B point reference line and the rear side edge of the paddle. Draw an extension line along the slope of the auxiliary slope plate on the rear side of the composite auxiliary tool as a second B point reference line. The intersection of the second B point reference line and the first B point reference line is projected onto the B point process block as a B point;

[0009] D. Draw a horizontal height line a at A point on the A point process block, take the height line a as the baseline and A point as the base point, rotate the blade angle value a to obtain a horizontal line b, and draw the horizontal line b on the A point process block;

[0010] E. Rotate the horizontal line b by an angle β to obtain a baseline c, take a circle with a radius of 150 mm on the baseline c with A point as the base point, and the intersection point is E, pass through the E point, draw a vertical segment of the baseline c with a length of 150*tanβ, and the end point is F, connect AF to draw AF on the A point process block, and AF is the installation angle line of the blade;

[0011] F. Draw the installation angle line on the B point process block in the manner of steps D and E;

[0012] G. Connect the A and B points to form the actual rotation axis line of the blade, remove the blade, rotate the blade with the actual rotation axis line as the rotation center axis until the installation angle line is rotated to the horizontal state to obtain the compound state of the blade;

[0013] H. Weld the blade to the hub in the compound state.

[0014] The principles and beneficial effects of the scheme are:

[0015] The blade is placed on the compound auxiliary tooling, A and B points are found out with the aid of the compound auxiliary tooling, A and B points are the end points of the actual rotation axis line of the blade, A and B points are connected to obtain the actual rotation axis line of the blade, and the installation angle line of the blade during rotation is also found out according to the compound auxiliary tooling, the blade is rotated until the installation angle line is horizontal, which indicates that the blade is rotated in place, and the installation state of the blade is determined. The installation state of the blade can be quickly and effectively determined by adopting the scheme, the compound auxiliary tooling is made through calculation parameters in the early stage, and after the compound auxiliary tooling is made, the compound auxiliary tooling can be used as an auxiliary tooling during compounding, and a large amount of measurement is not needed each time, the operation is convenient, and the processing efficiency is improved.

[0016] Further, the compound auxiliary tooling comprises a bottom plate, the bottom plate is provided with a support table matched with the shape of the blade, reference notches are arranged on the front and rear edges of the bottom plate, an auxiliary inclined plate is arranged on one side of the reference notches, the auxiliary inclined plate has an auxiliary inclined surface at the top, and the high end of the auxiliary inclined surface is close to the notches.

[0017] Beneficial effects: the support table is used for supporting the blade, the reference notches are used for determining the first A point reference line and the first B point reference line, the auxiliary inclined plate is used for determining the second A point reference line and the second B point reference line, and the installation angle line.

[0018] Further, the support table is enclosed by a plurality of support plates.

[0019] Beneficial effects: compared with the whole support table, the scheme saves materials, is convenient to process, and can process each support plate separately to better fit the shape of the paddle.

[0020] Further, the support plate is provided with a pressing plate for supporting the paddle, and the position height of the pressing plate can be adjusted.

[0021] Beneficial effects: by adjusting the position height of the pressing plate, different models of paddles can be applied within a certain range, and the application range is larger.

[0022] Further, the pressing plate is a reverse U-shaped pressing plate, and the pressing plate is detachably fixed on the support plate through bolts.

[0023] Beneficial effects: by fixing the bolts at different heights, the position height of the pressing plate can be adjusted, and the structure is simple and convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic view of the composite auxiliary tool in the embodiment of the application;

[0025] Figure 2 It is a front view of Figure 1

[0026] Figure 3 It is a schematic view of the use of the composite auxiliary tool;

[0027] Figure 4 It is a schematic view of determining the installation angle line in the application. DETAILED DESCRIPTION

[0028] The following will be further described in detail through specific embodiments:

[0029] The reference signs in the drawings of the specification include: support table 1, bolt 2, pressing plate 3, reference notch 4, auxiliary inclined plate 5, bottom plate 6, auxiliary inclined surface 7, paddle 8, rotation axis line 9, A point process block 10, and installation angle line 11.

[0030] Embodiment:

[0031] The composite method of the paddle of the axial flow water turbine adopts the composite auxiliary tool as shown in Figure 1 and Figure 2 ​The shown composite auxiliary tooling, composite auxiliary tooling includes the bottom plate 6, the bottom plate 6 is welded with the support table 1 matched with the shape of the blade 8, the support table 1 is enclosed by seven support plates, the top surface of the support table 1 is a special-shaped curved surface matched with the shape of the blade 8. The support plate is provided with a pressing plate 3 (only one is shown in the figure) for supporting the blade 8, the position height of the pressing plate 3 can be adjusted, specifically, the pressing plate 3 adopts an inverted U-shaped pressing plate 3, the pressing plate 3 is detachably fixed on the support plate through the bolt 2, by fixing the bolt 2 at different heights, the position height of the pressing plate 3 can be adjusted by clamping the pressing plate 3 from the U-shaped part. The reference notch 4 is opened on the front and rear edges of the bottom plate 6, the reference notch 4 is welded with the auxiliary inclined plate 5 on the right side, the auxiliary inclined plate 5 has an auxiliary inclined surface 7 on the top, and the high end of the auxiliary inclined surface 7 is close to the notch.

[0032] In combination Figure 3 And Figure 4 As shown, specifically comprising the following steps:

[0033] A. Place the blade with the front face upward on the composite auxiliary tooling, so that the points on the diagonal line of the blade are at the same height; B. Take the reference notch on the front side of the composite auxiliary tooling as the starting point, draw a first A point reference line vertically upward, weld an A point process block with a length and width of 200mm and a thickness of 10mm at the intersection of the first A point reference line and the front side edge of the blade; draw an extension line along the inclined surface of the auxiliary inclined plate on the front side of the composite auxiliary tooling as a second A point reference line, and the point on the A point process block projected by the intersection of the first A point reference line and the second A point reference line is the A point;

[0034] C. Take the reference notch on the back side of the composite auxiliary tooling as the starting point, draw a first B point reference line vertically upward, weld a B point process block with a length and width of 50mm and a thickness of 10mm at the intersection of the first B point reference line and the back side edge of the blade; draw an extension line along the inclined surface of the auxiliary inclined plate on the back side of the composite auxiliary tooling as a second B point reference line, and the point on the B point process block projected by the intersection of the first B point reference line and the second B point reference line is the B point;

[0035] D. Draw a horizontal height line a on the A point process block through the A point, take the height line a as the baseline and the A point as the base point, rotate the blade by an angle value α (α is the angle difference value between the height line a and the height line of the blade wood mold drawing, that is, rotate the height line a to the position of the height line of the blade wood mold drawing to obtain the horizontal line b), and draw a horizontal line b on the A point process block;

[0036] E. Turn the horizontal line b by angle β to get the base line c (β is the difference between the wood mold drawing angle of the blade 8 and the actual installation angle of the blade 8), draw the base line c on the A point process block, take a circle with a radius of 150 mm on the base line c with the A point as the base point, and the intersection point is E, draw a vertical segment of the base line c through the E point, the length is 150*tanβ, and the end point is F, connect AF, draw AF on the A point process block, and AF is the installation angle line of the blade;

[0037] F. Draw the installation angle line on the B point process block in the manner of steps D and E;

[0038] G. Connect AB points to form the actual rotation axis line of the blade, remove the blade, rotate the blade with the actual rotation axis line as the rotation center axis until the installation angle line is rotated to the horizontal state to obtain the compound state of the blade;

[0039] H. Weld the blade to the hub in the compound state.

[0040] When the compound auxiliary tooling is designed, the height of each support plate is set according to the state that the blade 8 is horizontally placed (the front face faces upward) and the angles on the two diagonal lines thereof are kept at the same height. The size of the bottom plate 6 is determined according to the machining stroke of the machine tool cutter, and a sufficient machining safety allowance can be left around the same. The reference notch 4 is determined according to the normal projection of the theoretical rotation axis line of the blade 8 onto the bottom plate 6. The auxiliary inclined plate 5 is installed next to the reference notch 4, and the auxiliary inclined surface 7 on the auxiliary inclined plate 5 is the position of the height line of the wood mold drawing of the blade.

[0041] The above only describes the embodiments of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described in detail. It should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the patent. The protection scope claimed in this application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A method of compositing a Francis turbine blade, characterized by: The composite auxiliary tool is used, and the steps are as follows: A. placing the blade with the front face upward on the composite auxiliary tool so that points on the diagonal line of the blade are at the same height; B. taking the reference notch on the front side of the composite auxiliary tool as a starting point, vertically upwardly drawing a first A point reference line, fixing an A point process block at the intersection of the first A point reference line and the front side edge of the blade, drawing an extension line along the slope of the auxiliary slope plate on the front side of the composite auxiliary tool as a second A point reference line, and taking the point, at which the intersection of the second A point reference line and the first A point reference line is orthogonally projected on the A point process block, as the A point; C. taking the reference notch on the rear side of the composite auxiliary tool as a starting point, vertically upwardly drawing a first B point reference line, fixing a B point process block at the intersection of the first B point reference line and the rear side edge of the blade, drawing an extension line along the slope of the auxiliary slope plate on the rear side of the composite auxiliary tool as a second B point reference line, and taking the point, at which the intersection of the second B point reference line and the first B point reference line is orthogonally projected on the B point process block, as the B point; D. drawing a horizontal height line a on the A point process block through the A point, taking the height line a as a baseline and the A point as a base point, rotating the blade by an angle value α to obtain a horizontal line b, and drawing the horizontal line b on the A point process block; E. rotating the horizontal line b by an angle β to obtain a baseline c, drawing a circle with a radius of 150 mm on the baseline c with the A point as a base point, taking the intersection as E, drawing a vertical segment of the baseline c through the E point, taking the end point as F, connecting AF, and drawing AF on the A point process block, wherein AF is the installation angle line of the blade; F. drawing the installation angle line on the B point process block in the manner of steps D and E; G. connecting the A and B points to form the actual rotation axis line of the blade, removing the blade, rotating the blade with the actual rotation axis line as a rotation center axis until the installation angle line is rotated to a horizontal state, and obtaining the composite state of the blade; H. welding the blade in the composite state to the hub; The composite auxiliary tool comprises a bottom plate, the bottom plate is provided with a supporting table matched with the shape of the blade, reference notches are arranged on the front and rear edges of the bottom plate, an auxiliary slope plate is arranged on one side of the reference notch, the auxiliary slope plate has an auxiliary slope at the top, and the high end of the auxiliary slope is close to the notch; the supporting table is enclosed by a plurality of supporting plates; the supporting plates are provided with pressing plates for supporting the blade, the positions and heights of the pressing plates can be adjusted; the pressing plates are inverted U-shaped pressing plates, and the pressing plates are detachably fixed on the supporting plates through bolts.

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