A method for assembling a red bush guide vane

Abstract

A kind of red sleeve type guide vane arrangement method, it relates to the field of steam turbine equipment assembly.The present application solves the technical problems of low arrangement efficiency and quality caused by the insufficient positioning accuracy of guide vane in the existing red sleeve type guide vane arrangement process, which leads to the non-compliance of the gap value between adjacent two blades and the throat value when the blades are welded.The arrangement method of the present application includes drawing extension lines and parallel lines of upper and lower half joints on the arrangement disc;dividing the arrangement disc area by 30°;detecting the accuracy of division;arranging blades, controlling the radial surface gap between adjacent blades and the throat size;grouping blades, controlling the cumulative pitch size of each group of blades;spot welding blades to complete the arrangement.The improvement of the line drawing method makes the positioning of guide vane more accurate, and the addition of the inspection step ensures the arrangement quality.The radial surface gap between adjacent blades and the throat size between adjacent blades are detected during the arrangement process to ensure the arrangement accuracy.The present application is used for the arrangement of steam turbine guide vane.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for fitting guide vanes of a steam turbine, and belongs to the field of steam turbine equipment assembly. BACKGROUND

[0002] The red sleeve type guide vane is mainly applied to the diaphragm of a small and medium-sized steam turbine unit, and the diaphragm is composed of a diaphragm inner ring, a guide vane and a diaphragm outer ring. The guide vane has a large head and a small head at both ends of the vane body. The existing process is to directly fit the guide vane on the diaphragm inner ring, and after the fitting is completed, the combination of the guide vane and the diaphragm inner ring is assembled on the diaphragm outer ring in the form of red sleeve assembly.

[0003] When the guide vanes are welded into a stator vane row and the guide vanes and the diaphragm inner ring and the diaphragm outer ring are welded together, welding shrinkage will be generated. The line drawing method used for positioning the guide vanes before fitting has insufficient positioning accuracy, and the welding shrinkage compensation value is not accurate, which can easily lead to the fact that the gap value between adjacent two vanes and the throat value do not meet the standards when the vanes are welded, and rework is likely to occur, thereby affecting the fitting efficiency and quality. SUMMARY

[0004] The present application aims to solve the technical problem that the positioning accuracy of the guide vanes is insufficient in the existing red sleeve type guide vane fitting process, which can lead to the fact that the gap value between adjacent two vanes and the throat value do not meet the standards when the vanes are welded, and the fitting efficiency and quality are low, and to provide a red sleeve type guide vane fitting method.

[0005] The technical solution of the present application is a red sleeve type guide vane fitting method, which comprises a vane small head and a vane large head. The guide vane is fitted on a diaphragm inner ring, the diaphragm inner ring comprises an upper half and a lower half, the fitting process is carried out on a horizontally placed fitting disc, and the upper half and the lower half of the diaphragm inner ring each leave a 3mm allowance at the median surface. The red sleeve type guide vane fitting method is realized through the following steps:

[0006] Step one: draw an extension line of the upper and lower joint seams on the fitting disc, and then draw parallel lines 3mm away from the upper and lower sides of the extension line;

[0007] Step two: draw the intersection of the first vane large head inner radial surface and the vane large head end surface arc, and divide the fitting disc area by 30° angles based on the intersection as a reference;

[0008] Step three: check the accuracy of the division;

[0009] Make the vane small head inner radial surface of the qualified guide vane coincide with the upper side parallel line of the other joint extension line, check whether the vane large head inner radial surface coincides with the seventh intersection, if yes, continue to the next step, otherwise, repeat step two;

[0010] Step four: fit the vanes, and control the radial surface gap and throat size between adjacent vanes.

[0011] Step five, grouping the leaves according to the equal division of the area in step two, regulating the cumulative pitch size of each group of leaves;

[0012] Step six, after setting the gasket seal between the upper half last leaf and the lower half first leaf, spot welding the leaves, and completing the assembly.

[0013] As another improvement of the present application, the step one comprises: inserting a plug gauge at any one of the upper and lower half joints, taking a qualified guide vane, with the steam inlet side downward, the small head end face arc of the vane tightly adhering to the outer circle of the inner ring of the baffle, the inner diameter radial surface of the small head of the vane tightly adhering to the plug gauge, drawing the extension line of the upper and lower half joints on the assembly disc with the tool, and drawing the parallel line 3mm away from the upper and lower sides of the extension line of the upper and lower half joints.

[0014] Similarly, the extension line of the other joint of the upper and lower half and the parallel line 3mm away from the upper and lower sides of the extension line of the other joint of the upper and lower half are drawn.

[0015] As another improvement of the present application, the step two comprises: placing the inner diameter radial surface of the small head of the qualified guide vane in coincidence with the upper side parallel line of the extension line of any one of the upper and lower half joints, measuring and regulating the distance between the inner diameter radial surface of the large head of the vane and the extension line of any one of the upper and lower half joints.

[0016] The intersection of the inner diameter radial surface of the large head of the vane and the small head end face arc is the first intersection, a sample hole is punched at the intersection, a circular arc is drawn with the sample hole as the center and the theoretical value of the chord length of the small head end face arc of the vane as the radius, the intersection with the small head end face arc is taken as the second intersection, and the third intersection to the seventh intersection are continued to be made in this way, and the area where the upper half of the inner ring of the baffle of the assembly disc is located is divided into six equal parts by 30°.

[0017] Similarly, the area where the lower half of the inner ring of the baffle of the assembly disc is located is divided into six equal parts by 30°.

[0018] As another improvement of the present application, the step four comprises: taking the first leaf with the steam inlet side downward, the small head end face arc of the vane tightly adhering to the upper half of the inner ring of the baffle, the inner diameter radial surface of the small head of the first leaf pressing the upper side parallel line of the extension line of any one of the upper and lower half joints by 1mm, fixing the first leaf on the assembly disc with 502 glue and finishing machining the first leaf; assembling the leaves on the upper half of the inner ring of the baffle, detecting the radial gap between the adjacent leaves with the plug gauge and detecting the throat size between the adjacent leaves with the taper gauge during the assembly process.

[0019] Similarly, the leaves on the lower half of the inner ring of the baffle are assembled.

[0020] As another improvement of the present application, the specific method for detecting the radial face gap between adjacent blades by using a feeler gauge is that the feeler gauge of 0.04mm does not enter between the straight faces, and the feeler gauge of 0.1mm does not enter between the inclined faces.

[0021] As another improvement of the present application, the throat size is actually 0.1mm larger than the design value.

[0022] As another improvement of the present application, the gap between the blade inlet side and the positioning face of the distributor plate is not greater than 0.08mm.

[0023] As another improvement of the present application, the gap between the blade small end face arc and the inner ring of the baffle is not greater than 0.1mm, and the blade small end face arc and the inner ring of the baffle have a contact point.

[0024] As another improvement of the present application, the step five comprises: dividing the upper half blade of the inner ring of the baffle into 6 groups according to the 30° equal division area, and the cumulative pitch size of each group of blades is represented by T, the T value of the first group of blades is -0.66mm according to the theoretical calculation value, -0.33mm for the second group, -0mm for the third group, -0.33mm for the fourth group, -0.66mm for the fifth group, and -1mm for the sixth group. The cumulative pitch size of each group of blades is measured and controlled to meet the theoretical calculation value of the T value;

[0025] Similarly, the lower half blade of the inner ring of the baffle is grouped, measured and controlled.

[0026] As another improvement of the present application, the step six comprises: setting a gasket seal between the last blade of the upper half of the inner ring of the baffle and the first blade of the lower half of the inner ring of the baffle; and spot welding the blade and the corresponding baffle at the inner point of the welding bevel, and spot welding between adjacent blades, and completing the distribution.

[0027] The present application has the following beneficial effects:

[0028] 1. Before distribution, draw the extension lines of the upper and lower half joints on the distribution plate, and then draw parallel lines 3mm away from the upper and lower sides of the extension lines; draw the intersection point of the first intersection point to the seventh intersection point, and the intersection point as the reference, which makes the positioning of the guide vane more accurate;

[0029] 2. After drawing lines on the distribution plate, divide the area of the distribution plate by 30°, and add an inspection step to ensure the distribution quality, reduce the rework rate, and improve the distribution efficiency;

[0030] 3. Detect the radial face gap between adjacent blades and the throat size between adjacent blades during the distribution process to ensure the distribution accuracy;

[0031] 4. In the process of arranging, measuring and controlling the cumulative pitch of each group of blades, a more accurate reserved compensation value is reserved to ensure that the total pitch size after welding and shrinkage meets the design requirements. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a top view of the present invention, a red sleeve type guide vane arranging method, a partition inner ring placed on an arranging disc.

[0033] Figure 2 is a schematic diagram of the present invention, a red sleeve type guide vane arranging method, a line drawn on an arranging disc.

[0034] Figure 3 is Figure 2 an enlarged schematic diagram at A.

[0035] Figure 4 is a schematic diagram of the present invention, a red sleeve type guide vane arranging method, a guide vane arranging completion. DETAILED DESCRIPTION

[0036] DETAILED EMBODIMENT ONE: COMBINED Figures 1 to 3 This embodiment is a red sleeve type guide vane arranging method, a guide vane including a vane small head and a vane large head; the guide vane is arranged on a partition inner ring 2, the partition inner ring including an upper half and a lower half, the arranging process is performed on a horizontally placed arranging disc 1, the upper half and the lower half of the partition inner ring 2 each leave a 3mm allowance at a median surface, the upper and lower halves of the partition inner ring are combined into an oval-like structure with a long axis 6mm longer than a short axis, the red sleeve type guide vane arranging method includes the following steps:

[0037] Step one, draw an extension line of a first joint 31 and another joint 32 on the arranging disc 1, and then draw a parallel line 51 at a distance of 3mm on both sides of the extension line of the first joint 31 and a parallel line 52 of the extension line of the other joint 32;

[0038] Step two, draw the intersection of the first vane large head inner radial surface and the vane large head end surface arc, take the intersection as a reference, draw a first intersection 61 to a seventh intersection 67, and divide the arranging disc 1 area by 30° angles;

[0039] Step three, detect the accuracy of the division;

[0040] The vane small head inner radial surface of the qualified guide vane coincides with the upper side parallel line of the extension line of the other joint 32, and the vane large head inner radial surface is checked whether it coincides with the seventh intersection 67, if yes, continue to the next step, otherwise, repeat step two;

[0041] Step four, arrange the vane, control the radial surface gap between adjacent vanes and the throat size;

[0042] Step five, group the leaves by the equal division area as step two, control the cumulative pitch size of each group of leaves;

[0043] Step six, after setting the gasket 7 between the upper half last leaf and the lower half first leaf, spot weld the leaves, and complete the assembly.

[0044] The effect of the embodiment is to more accurately control the radiation deviation of the leaves when the radiation gauge cannot be used, to improve the drawing method to make the guide vane positioning more accurate, and to meet the compensation value of the gap value between the adjacent two leaves, the throat value, and the welding shrinkage when the guide vane is assembled and welded.

[0045] Specific implementation method two: Figures 1 to 3 The embodiment is explained. The difference between the embodiment and the specific implementation method one is that the step one drawing method specifically includes: substep one, insert a single 0.3-0.5mm plug gauge at the upper and lower half of any joint 31, take a qualified guide vane, with the steam side downward, the vane small head end face arc is tightly attached to the outer circle of the partition inner ring 2, the inner diameter of the vane small head is tightly attached to the plug gauge, and the inner diameter of the vane small head is tightly attached to the plug gauge on the assembly disc 1 to draw the extension line of the upper and lower half joints 31;

[0046] Substep two, draw parallel lines 51 on both sides of the extension line of the upper and lower half joints 31, each 3mm away from the extension line;

[0047] Substep three, draw the extension line of the other upper and lower half joint 32 and the parallel line 52 on both sides of the extension line of the other upper and lower half joint 32, each 3mm away from the extension line. The drawing method of the embodiment makes the guide vane positioning more accurate, and the other steps are the same as the specific implementation method one.

[0048] Specific implementation method three: Figures 2 to 3 The embodiment is explained. The difference between the embodiment and the specific implementation method one is that the intersection drawing method of step two specifically includes: substep one, place the inner diameter of the vane small head in the upper and lower half of any joint 31 extension line on the upper side of the parallel line, the vane small head end face arc is tightly attached to the partition inner ring end face arc, the vernier caliper measures the distance between the inner diameter of the vane large head and the upper and lower half of any joint 31 extension line, and adjusts the inner diameter of the vane large head and the upper and lower partition joint 31 extension line to meet the theoretical calculation value;

[0049] Step two, the blade tip close to the inner ring of the partition slide record the moving track of the blade head end face on the projection of the dial plate as the blade head end face arc, the intersection of the blade head inner diameter and the blade head end face arc is the first intersection of the 30° scale of the dial plate, the sample hole is punched at the intersection, and the circle is drawn with the sample hole as the center and the 30° chord length of the blade head end face arc as the radius, and the intersection with the blade head end face arc is taken as the second intersection, and the third intersection to the seventh intersection are continued to be made in this way, and the area of the upper half of the inner ring of the partition of the dial plate 1 is divided into six equal parts by 30°.

[0050] Step three, the lower half of the inner ring of the partition of the dial plate 1 is also divided into six equal parts by 30° in the same way. The other steps are the same as those in embodiment one or two.

[0051] Embodiment four, the difference between this embodiment and embodiment one is that the dialing and regulating method in step four specifically includes: step one, the first blade is placed with the steam inlet side downward, the blade tip end face arc is tightly attached to the upper half of the inner ring of the partition, and the first blade is fixed on the dial plate 1 by using 502 glue while the first blade is precisely machined.

[0052] Step two, dial the full blade on the upper half of the inner ring of the partition, and detect the radial gap between adjacent blades by using a feeler gauge during the dialing process.

[0053] Step three, detect the throat size between adjacent blades by using a taper gauge.

[0054] Step four, dial the blades on the lower half of the inner ring of the partition in the same way. The other steps are the same as those in any one of embodiments one, two or three.

[0055] Embodiment five, the difference between this embodiment and embodiment four is that the specific method of detecting the radial gap between adjacent blades by using a feeler gauge in step two of step four is that the feeler gauge does not enter 0.04mm between straight surfaces and 0.1mm between inclined surfaces. The other steps are the same as those in any one of embodiments one to four.

[0056] Embodiment six, the difference between this embodiment and embodiment four is that the actual size of the throat size in step three of step four is 0.1mm larger than the design value. The other steps are the same as those in any one of embodiments one to five.

[0057] Embodiment seven, the difference between this embodiment and embodiment four is that the gap between the steam inlet side of the guide vane and the positioning surface of the dial plate 1 is not greater than 0.08mm. The other steps are the same as those in any one of embodiments one to six.

[0058] The eighth embodiment is different from the fourth embodiment in that the gap between the small end face arc of the guide vane and the inner ring 2 of the partition plate is not greater than 0.1 mm in step four, and the small end face arc of the vane and the inner ring 2 of the partition plate have a contact point. The other steps are the same as any one of the first to seventh embodiments.

[0059] The ninth embodiment is different from the first embodiment in that the measurement and control method in step five specifically includes: the number of vanes that can be placed within a 30-degree range on the upper half of the inner ring of the partition plate is ±1 for a group, the vertical distance between the point on the projection of the edge line of the last vane of each group of vanes intersecting the back radial face and the large end face of the vane itself on the closest 30° scale line on the distributor plate is the cumulative pitch size of each group of vanes, denoted as T, the T value of the first group of vanes is -0.66 mm according to the theoretical calculation value, the T value of the second group is -0.33 mm according to the theoretical calculation value, the T value of the third group is -0 mm according to the theoretical calculation value, the T value of the fourth group is -0.33 mm according to the theoretical calculation value, the T value of the fifth group is -0.66 mm according to the theoretical calculation value, and the T value of the sixth group is -1 mm according to the theoretical calculation value. The cumulative pitch size of each group of vanes is measured and controlled to meet the theoretical calculation value of the T value; the effect is to ensure that the total pitch size after the vane is assembled and welded to shrink meets the design drawing requirements. The other steps are the same as any one of the first to eighth embodiments.

[0060] The tenth embodiment is combined with the first embodiment. Figures 2 to 4 Figures 1 to 3 The tenth embodiment is combined with the first embodiment.

[0061] The second step two, the vanes and the corresponding partition plate are spot welded in the welding bevel, the vanes are spot welded between adjacent vanes, and the distribution is completed. When spot welding, two vanes at 90° position are welded first, and the spot welding and fixation of all vanes on the upper half of the partition plate are alternately and gradually completed from 90 degrees to 0 degrees and 180 degrees. The effect is to avoid interference when the partition plate is assembled and welded into a stator vane row. The other steps are the same as any one of the first to ninth embodiments.

[0062] The eleventh embodiment is different from the fourth embodiment in that a screw cap is placed at the outer circle of the large end face of every 4-5 distributed vanes, the screw cap must be in contact with the outer circle of the guide vane, and the screw cap is fixed on the distribution plate with 502 glue, which prevents the front vanes from moving when the rear vanes are distributed.

[0063] The above examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalent features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for fitting red-sleeved guide vanes, wherein the guide vanes have a small end and a large end; the guide vanes are fitted onto an inner ring (2) of a partition plate, the inner ring (2) of the partition plate comprising an upper half ring and a lower half ring, the upper half ring and the lower half ring being fastened together, the fitting process being performed on a horizontally placed fitting plate (1), wherein the upper half ring and the lower half ring of the inner ring (2) each leave a 3mm allowance at the midpoint, characterized in that, The red-sleeve guide vane fitting method includes the following steps: Step 1: Draw the extension lines of the upper and lower half seams (31) and the other seam (32) on the mixing plate (1), and then draw parallel lines (51) 3mm away from the upper and lower sides of the extension line of the first seam (31) and parallel lines (52) 3mm away from the upper and lower sides of the extension line of the other seam (32). Step 2: Draw the intersection of the inner radial surface of the first blade head and the arc of the blade head end face. Using the intersection as a reference, draw the first intersection (61) to the seventh intersection (67) and divide the area of ​​the brush plate (1) into equal parts at 30° angles. Step 3: Check the accuracy of the division; Align the inner radial surface of the small end of the qualified guide vane with the parallel line above the extension line of another joint (32), and check whether the inner radial surface of the large end of the vane coincides with the seventh intersection point (67). If yes, continue to the next step; otherwise, repeat step two. Step 4: Fit the guide vanes and adjust the radial surface clearance and throat size between adjacent guide vanes; Step 5: Divide the guide vanes into equal groups as described in Step 2, and adjust the cumulative pitch size of each group of guide vanes. Step 6: After sealing the gap between the upper end blade and the lower beginning blade with a gasket (7), spot weld the guide blade to complete the assembly.

2. The method for fitting red-sleeved guide vanes according to claim 1, characterized in that, The line-drawing method in step one specifically includes: Step 1: Insert a feeler gauge at the joint (31) of the upper and lower halves. Take a qualified guide vane with the steam inlet side facing down. The arc of the small end face of the guide vane should be close to the outer circle of the inner ring (2) of the partition plate. Place the inner radial surface of the small end of the guide vane close to the feeler gauge. Use a tool to draw the extension line of the upper and lower halves joint (31) on the mixing plate (1) with the inner radial surface of the small end of the vane close to the feeler gauge. Step 2: Draw parallel lines (51) 3mm away from the upper and lower sides of the extension line of the upper and lower half-joint (31). Step 3: Using the same method, draw the extension lines of the other seam (32) of the upper and lower halves and parallel lines (52) 3mm away from the upper and lower sides of the extension lines of the other seam of the upper and lower halves.

3. The method for fitting red-sleeved guide vanes according to claim 1, characterized in that, The method for drawing intersection points in step two specifically includes: Step 1: Place the inner radial surface of the small end of the qualified guide vane to coincide with the upper parallel line of the extension line of the upper and lower half joint (31), and measure and adjust the distance between the inner radial surface of the large end of the vane and the extension line of the upper and lower half joint (31). Step 2: The first intersection point is the intersection of the inner radial surface of the blade head and the arc of the blade head end face. A punch is made at the intersection point. With the punch as the center, an arc is drawn with the theoretical value of the 30° chord length of the arc of the blade head end face as the radius. The intersection point with the arc of the blade head end face is the second intersection point. The third to seventh intersection points are made in this way. The area where the upper half of the inner ring of the baffle plate (1) is located is divided into six parts at 30°. Step 3: Using the same method, divide the area where the lower half of the inner ring of the partition plate (1) is located into six equal parts at 30°.

4. The method for fitting red-sleeved guide vanes according to claim 1, characterized in that, The blending and control methods in step four specifically include: Step 1: Place the first blade with the steam inlet side facing downwards, and press the arc of the small end face of the blade against the upper half of the inner ring of the partition plate. Press the upper parallel line of the upper and lower half joint (31) of the inner radial surface of the small end of the first blade by 1mm. Fix the first blade on the mixing plate (1) with glue and at the same time perform fine processing on the first blade. Step 2: Fully assemble the blades on the upper half of the inner ring of the partition plate. During the assembly process, use a feeler gauge to check the radial surface clearance between adjacent blades. Step 3: Use a taper ruler to measure the throat dimensions between adjacent blades; Step four: Using the same method, brush the blades on the lower half of the inner ring of the partition.

5. The method for fitting red-sleeved guide vanes according to claim 4, characterized in that, The specific method for detecting the radial surface gap between adjacent blades using a feeler gauge, as described in step two of step four, is as follows: the feeler gauge should not penetrate 0.04mm between straight surfaces, and should not penetrate 0.1mm between inclined surfaces.

6. The method for fitting red-sleeved guide vanes according to claim 4, characterized in that, In step four, the actual size of the throat, as described in step three, is 0.1 mm larger than the design value.

7. A method for fitting red-sleeved guide vanes according to any one of claims 4-6, characterized in that, In step four, the gap between the steam inlet side of the guide vane and the positioning surface of the mixing plate (1) shall not exceed 0.08 mm.

8. A method for fitting red-sleeved guide vanes according to any one of claims 4-6, characterized in that, In step four, the gap between the small end face arc of the guide vane and the inner ring (2) of the partition plate is no more than 0.1 mm, and there is a contact point between the small end face arc of the vane and the inner ring (2) of the partition plate.

9. The method for fitting red-sleeved guide vanes according to claim 1, characterized in that, The control method in step five specifically includes: Step 1: Divide the blades on the upper half of the inner ring of the partition into 6 groups, each with a 30° interval. The cumulative pitch dimension of each group of blades is denoted by T. The T value for the first group of blades is calculated as theoretical value -0.66 mm, for the second group -0.33 mm, for the third group -0 mm, for the fourth group -0.33 mm, for the fifth group -0.66 mm, and for the sixth group -1 mm. Measure and adjust the cumulative pitch dimension of each group of blades to conform to the theoretically calculated T value. Step two: Using the same method, group, measure, and adjust the blades in the lower half of the inner ring of the diaphragm.

10. The method for fitting red-sleeved guide vanes according to claim 1, characterized in that, The method for setting the gasket (7) for sealing and spot welding the guide vanes in step six specifically includes: Step 1: A gasket (7) is placed between the last blade of the upper half of the inner ring of the partition and the first blade of the lower half of the inner ring of the partition to seal the opening. Step two: Spot weld the guide vanes to the corresponding partition plates within the welding groove, and spot weld adjacent guide vanes to complete the assembly.

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