Device and method for controlling the gap between the blades of a set of vanes before brazing

Abstract

The application discloses a device and method for controlling the gap between blades before integral brazing of multiple groups of guide vanes of an expander, which comprises a base plate, a dividing disc, a vertical plate, a shaft, a cushion block, a pressing plate, a handle, a support plate, a top block, a pressing bolt, a baffle, two positioning pins and a bolt. When the guide vanes are assembled by using the above-mentioned control device, one group or multiple groups are assembled at a time, the two positioning pins are alternately used to ensure that the interval between the guide vanes meets the design gap requirement, the relative positions of all the guide vanes before integral brazing of the expander are determined through positioning welding, and the installation of the remaining guide vanes is completed one by one through the dividing disc. The application can well control the interval between the blades, meets the design gap size required by the process, and has high blade assembly efficiency. Furthermore, the application can save the use of the guide vane design gap control clamp during the subsequent integral brazing of the expander, and reduce the production cost and the clamp use cost.

Description

Technical Field

[0001] This invention belongs to the field of brazing assembly technology, specifically a device and method for controlling the blade gap before integral brazing of multiple guide vanes of a diffuser. Background Technology

[0002] The diffuser is a crucial component of an engine, consisting of a front guide vane, a rear guide vane, an inner casing, and an outer casing. The primary purpose of the diffuser is to convert the velocity energy of the gas into pressure energy; therefore, the clearance control between the blades (front and rear guide vanes) directly affects the energy conversion value and the overall efficiency of the component.

[0003] The diffuser is manufactured by brazing hundreds of front and rear guide vanes to the outer and inner casings of the diffuser to form an assembly. The gap between each set of blades (a set of blades includes one front guide vane and one rear guide vane, which are distributed at the same angle to each other on the circumferential surface of the diffuser inner casing) needs to be well controlled to meet the design requirements of the process dimensions. The quality of dimensional control directly affects the operation of the engine, so it is crucial to control the gap between the blades to ensure uniform airflow. Summary of the Invention

[0004] This invention aims to provide a device and method for controlling the blade clearance before integral brazing of multiple guide vanes in a diffuser. This method effectively controls the blade clearance during the blade (guide vane) assembly process before brazing, maximizing the role of the control device in the assembly process. The device ensures the blades (guide vanes) are properly assembled and the spacing between them is well controlled, meeting the design clearance dimensions required by the process requirements, and achieving high assembly efficiency. Furthermore, it eliminates the need for guide vane clearance control fixtures during subsequent integral brazing of the diffuser, reducing production and fixture usage costs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for controlling blade clearance before integral brazing of multiple guide vanes in a diffuser, including,

[0007] Indexing plate;

[0008] A shaft, the shaft being aligned with the axis of the indexing plate, and the first end of the shaft being fixedly connected to the indexing plate;

[0009] A pressure plate, which is detachably connected to the second end of the shaft;

[0010] A top block, which is movably connected to one side of the shaft, and the movement trajectory of the top block is a straight line that intersects the shaft perpendicularly;

[0011] The two positioning pins are located on opposite sides of the movement trajectory of the top block, and the outer diameter of the positioning pins is equal to the design clearance between adjacent front and rear guide vanes on the inner diffuser casing.

[0012] Furthermore, the device for controlling the blade clearance before integral brazing of multiple guide vanes in the diffuser also includes,

[0013] Chassis;

[0014] A vertical plate is vertically connected to the upper surface of the chassis, and the indexing plate is fixed to the surface of the vertical plate;

[0015] The support plate is connected to the vertical plate and located above the indexing plate, and the clamping bolt is threaded to the support plate and its end is connected to the top block.

[0016] A pin is inserted into the upright plate. The pin has at least two pin holes for positioning pins, and the distance between two adjacent pin holes is an integer multiple of the interval D between two adjacent design gaps on the inner diffuser casing.

[0017] A method for controlling blade clearance before integral brazing of multiple guide vanes in a diffuser, employing the aforementioned apparatus, and including the following steps:

[0018] Step 1: Coaxially assemble the diffuser inner casing onto the shaft and press it onto the indexing plate with a pressure plate, so that the diffuser inner casing and the indexing plate rotate synchronously;

[0019] Step 2: Select a set of front guide vane mounting slots and rear guide vane mounting slots in the area directly above the diffuser inner casing, and install one front guide vane and one rear guide vane in them to complete the installation of the first set of guide vanes;

[0020] Step 3: Insert two locating pins on each side of the first set of guide vanes and keep them stationary. One locating pin is close to the front guide vane and the other locating pin is close to the rear guide vane. The locating pins are parallel to the axis of the diffuser inner casing. The distance between the two locating pins is equal to the interval D of the two adjacent design gaps on the inner diffuser casing.

[0021] Step 4: Install one front guide vane and one rear guide vane in the front guide vane mounting slot and the rear guide vane mounting slot that are closest to the two locating pins in Step 3 and are not in the same group, ensuring that the front guide vane and the rear guide vane are tightly attached to their respective locating pins.

[0022] Step 5: Install the other rear guide vane in the same group as the front guide vane in Step 4, and the other front guide vane in the same group as the rear guide vane in Step 4, to complete the installation of the other two groups of guide vanes;

[0023] Step 6: Move the top block downwards so that it presses against the three sets of guide vanes completed in steps 2 to 5, and fix the position of the three sets of guide vanes by tack welding;

[0024] Step 7: Pull out the two positioning pins, move the top block upwards, and rotate the indexing plate clockwise or counterclockwise by one angle. The angle is equal to the central angle of the three sets of guide vanes that have been installed on the inner casing of the diffuser.

[0025] Step 8: Select a set of front and rear guide vane mounting slots that are closest to the already installed guide vanes and have not yet been fitted with guide vanes. Insert one of the locating pins parallel to the diffuser inner casing axis into the slots, ensuring the locating pin is flush against the already installed front or rear guide vane. Then, install the front and rear guide vanes in this set of slots, ensuring the front or rear guide vane in this set is flush against the locating pin. After completing the installation of this set of guide vanes, insert another locating pin between this set of guide vanes and the next set of front and rear guide vane mounting slots that have not yet been fitted with guide vanes. The locating pin is parallel to the diffuser inner casing axis and is flush against the front or rear guide vane in this set of guide vanes. Move the top block downwards to press the top block against the set of guide vanes and perform tack welding to position the set of guide vanes.

[0026] Step nine: Pull out the two positioning pins, move the top block upwards, and rotate the indexing plate clockwise or counterclockwise by one angle. The angle is equal to the central angle of the two adjacent sets of guide vanes on the diffuser inner casing. Then repeat steps eight and nine to complete the installation of the remaining guide vanes on the diffuser inner casing.

[0027] To improve the installation efficiency of guide vanes, the following installation method can be adopted.

[0028] A method for controlling blade clearance before integral brazing of multiple guide vanes in a diffuser, employing the aforementioned apparatus, and including the following steps:

[0029] Step 1: Coaxially assemble the diffuser inner casing onto the shaft and press it onto the indexing plate with a pressure plate, so that the diffuser inner casing and the indexing plate rotate synchronously;

[0030] Step 2: Select multiple sets of consecutive adjacent front guide vane mounting slots and rear guide vane mounting slots in the area directly above the diffuser inner casing, and install the front and rear guide vanes in them;

[0031] Step 3: Move the top block downwards so that it presses against the upper ends of all the front and rear guide vanes installed in Step 2. Insert a locating pin parallel to the axis of the diffuser inner casing and press it against the outermost front or rear guide vane of the multiple sets of guide vanes. Use another locating pin to check whether the interval between adjacent sets of guide vanes is equal to the design clearance. If it is equal, insert the locating pin along the direction parallel to the axis of the diffuser inner casing to the outer side of the set of guide vanes that is farthest from the first locating pin and press it against the front or rear guide vane in that set. If it is not equal, move the front or rear guide vanes on both sides or one side of the locating pin until they are equal.

[0032] Step 4: Keeping the two locating pins in place, fix the positions of multiple sets of guide vanes using tack welding;

[0033] Step 5: Pull out the two positioning pins, move the fixed block upwards, and rotate the indexing plate clockwise or counterclockwise by an angle equal to the central angle of the multiple sets of guide vanes that have been installed on the diffuser inner casing. This will allow the next batch of the same number of front guide vane mounting slots and rear guide vane mounting slots to move to the position in Step 2. Repeat Steps 2 to 5 to complete the installation of the remaining guide vanes on the diffuser inner casing.

[0034] Compared with the prior art, the control device of the present invention is easy to operate, has low design and manufacturing costs, and the control method is convenient to implement on site. It is beneficial to the size control of parts, eliminates the influence of human factors during operation, and makes it easy to control the dimensions (design clearance) of key positions. It eliminates the need for guide vane clearance control fixtures during subsequent brazing, greatly reduces fixture wear, and saves processing costs. It has been verified in the production of multiple diffusers and has shown good results. Attached Figure Description

[0035] Figure 1 This is a cross-sectional view of the control device in this invention;

[0036] Figure 2 yes Figure 1 The right view;

[0037] Figure 3 This is a schematic diagram showing the state in which the front guide vane and the rear guide vane are assembled on the inner casing of the diffuser in this invention;

[0038] Figure 4 yes Figure 3 A partial top view including the leading and trailing vanes;

[0039] In the diagram, 1-chassis, 2-indexing plate, 3-vertical plate, 4-shaft, 5-pad, 6-pressure plate, 7-handle, 8-support plate, 9-top block, 10-clamping bolt, 11-baffle, 12-locating pin, 13-pin, 14-diffuser inner casing, 15-front guide vane, 16-rear guide vane, 17-design clearance. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0041] like Figure 1 and Figure 2 As shown, the device designed by the present invention for controlling the blade gap before integral brazing of multiple guide vanes of a diffuser includes a chassis 1, an indexing plate 2, a vertical plate 3, a shaft 4, a pad 5, a pressure plate 6, a handle 7, a support plate 8, a top block 9, a clamping bolt 10, a baffle 11, two positioning pins 12 and a pin 13.

[0042] The vertical plate 3 is vertically connected to the upper end face of the chassis 1, and the indexing plate 2 is fixed to the surface of the vertical plate 3. The rotation and locking of the indexing plate 2 are controlled by the handle 7. The shaft 4 coincides with the axis of the indexing plate 2, and the first end of the shaft 4 is fixedly connected to the indexing plate 2. The pressure plate 6 is detachably connected to the second end of the shaft 4 and is used with the pad block 5 to press the diffuser inner casing 14. The top block 9 is movably connected to one side of the shaft 4, and the movement trajectory of the top block 9 is a straight line perpendicular to the shaft 4. The movement path of the top block 9 is restricted by the baffle 11 to ensure its straight state. Two positioning pins 12 are located on both sides of the movement trajectory of the top block 9, and the outer diameter of the positioning pins 12 is equal to the design gap 17 between the adjacent front guide vane 15 and the rear guide vane 16 on the inner diffuser casing 14. The support plate 8 is connected to the vertical plate 3 and located above the indexing plate 2. The clamping bolt 10 is threadedly connected to the support plate 8 and the end of the clamping bolt 10 is connected to the top block 9. The pin 13 (the pins in embodiments 1 and 2 are straight pins) is inserted into the vertical plate 3. The pin 13 has two pin holes for positioning pins 12, and the distance between the two adjacent pin holes is equal to the interval distance D of the two adjacent design gaps 17 on the inner diffuser casing 14 or equal to twice the interval distance.

[0043] The following are two blade assembly gap control methods using the blade gap control device described above. The assembly efficiency of Example 1 is relatively low, while that of Example 2 is relatively high and can assemble multiple sets (2, 3 or even 4 sets) of guide vanes at once.

[0044] Example 1:

[0045] A method for controlling blade clearance before integral brazing of multiple guide vanes in a diffuser employs a control device that makes the distance between two adjacent pin holes on the aforementioned pin 13 equal to the interval D between two adjacent design clearances 17 on the inner diffuser casing 14, and includes the following steps:

[0046] Step 1: Coaxially assemble the diffuser inner casing 14 onto the shaft 4 and press it onto the indexing plate 2 using the pressure plate 6 and the pad 5, so that the diffuser inner casing 14 and the indexing plate 2 rotate synchronously.

[0047] Step 2: Loosen handle 7 and rotate indexing plate 2 to select a set of front guide vane mounting slots and rear guide vane mounting slots in the area directly above the diffuser inner casing 14. Tighten handle 7 to lock the position of indexing plate 2. Then install one front guide vane 15 and one rear guide vane 16 in each of the set of front guide vane mounting slots and rear guide vane mounting slots to complete the installation of the first set of guide vanes.

[0048] Step 3: Insert the pin 13 into the vertical plate 3 and fix it. Insert two positioning pins 12 into the two pin holes of the pin 13 on both sides of the first set of guide vanes and keep them stationary. One positioning pin 12 is close to the front guide vane 15 and the other positioning pin 12 is close to the rear guide vane 16. The positioning pins 12 are parallel to the axis of the diffuser inner casing 14. At this time, the distance between the two positioning pins 12 is equal to the interval distance D of the two adjacent design gaps 17 on the inner diffuser casing 14.

[0049] Step 4: The front guide vane mounting slot and the rear guide vane mounting slot (which can be understood as...) are closest to the two locating pins 12 in Step 3 but not from the same group. Figure 4 Install one front guide vane 15 and one rear guide vane 16 in the upper left corner and the complete front guide vane 15 in the lower right corner, respectively, ensuring that the front guide vane 15 and the rear guide vane 16 are tightly attached to their respective positioning pins 12.

[0050] Step 5: Install another rear guide vane 16 in the same group as the front guide vane 15 in Step 4, and another front guide vane 15 in the same group as the rear guide vane 16 in Step 4, to complete the installation of the other two groups of guide vanes.

[0051] Step Six: Move the top block 9 downwards so that it presses against the three sets of guide vanes completed in Steps Two through Five, using tack welding. Figure 4 The position of the three sets of guide vanes is fixed by the spot welding position.

[0052] Step 7: Pull out the two positioning pins 12, move the top block 9 upward, release the handle 7, and rotate the indexing plate 2 clockwise or counterclockwise by one angle. The angle is equal to the central angle of the three sets of guide vanes that have been installed on the diffuser inner casing 14.

[0053] Step 8: Select a set of front guide vane mounting slots and rear guide vane mounting slots that are closest to the already installed guide vanes and have not yet been fitted with guide vanes. Lock handle 7, and insert one of the positioning pins 12 parallel to the axis of the diffuser inner casing 14 into the space between the two slots and into the pin hole of the pin 13. The positioning pin 12 should be tightly against the already installed front guide vane 15 or rear guide vane 16. Then, install the front guide vane 15 and rear guide vane 16 in this set of front guide vane mounting slots and rear guide vane mounting slots, ensuring that the front guide vane 15 or rear guide vane in this set is properly installed. After the installation of the guide vanes is completed with the positioning pin 12 close to the guide vane, another positioning pin 12 is inserted between the guide vane and the nearest guide vane mounting slot and the next guide vane mounting slot that has not yet been installed. The positioning pin 12 is inserted into the pin hole of the pin 13 parallel to the axis of the diffuser inner casing 14, so that the positioning pin 12 is close to the front guide vane 15 or the rear guide vane 16 in the guide vane group. The top block 9 is moved downward so that the top block 9 presses the guide vane group and performs positioning welding to position the guide vane group.

[0054] Step nine: Pull out the two positioning pins 12, move the top block 9 upward, release the handle 7, and rotate the indexing plate 2 clockwise or counterclockwise by one angle. The angle is equal to the central angle of the two adjacent sets of guide vanes on the diffuser inner casing 14. Then repeat steps eight and nine to complete the installation of the remaining guide vanes on the diffuser inner casing 14.

[0055] Example 2:

[0056] A method for controlling blade clearance before integral brazing of multiple guide vanes in a diffuser employs a control device where the distance between two adjacent pin holes on the aforementioned pin 13 is equal to twice the interval D of the two adjacent design clearances 17 on the inner diffuser casing 14, and includes the following steps.

[0057] Step 1: Coaxially assemble the diffuser inner casing 14 onto the shaft 4 and press it onto the indexing plate 2 using the pressure plate 6 and the pad 5, so that the diffuser inner casing 14 rotates synchronously with the indexing plate 2.

[0058] Step 2: Release handle 7 and rotate indexing plate 2 to select two consecutive adjacent front guide vane mounting slots and rear guide vane mounting slots in the area directly above the diffuser inner casing 14. Lock handle 7 and install front guide vane 15 and rear guide vane 16 in the aforementioned two sets of front guide vane mounting slots and rear guide vane mounting slots respectively.

[0059] Step 3: Move the top block 9 downwards so that it presses against the upper ends of the two sets of front guide vanes 15 and rear guide vanes 16 installed in Step 2. Insert a locating pin 12 parallel to the axis of the diffuser inner casing 14 until it is inserted into the pin hole of the pin 13. The locating pin 12 should be close to the outermost set of front guide vanes 15 or rear guide vanes 16. Use another locating pin 12 to check whether the interval between two adjacent sets of guide vanes is equal to the design gap 17. If they are equal, move the locating pin 12 along... Insert the guide vane furthest from the first locating pin 12 into the pin hole of the insert pin 13, parallel to the axis of the diffuser inner casing 14. The locating pin 12 should be tightly against the front guide vane 15 or the rear guide vane 16 in that group of guide vanes. If they are not equal, move the front guide vane 15 or the rear guide vane 16 on both sides or one side of the locating pin 12 (if moving or rotating does not meet the requirements, remove the guide vane, grind the part that mates with the mounting slot, and then reinstall it) until they are equal.

[0060] Step 4: Keeping the two locating pins 12 in place, fix the positions of the two sets of guide vanes using tack welding;

[0061] Step 5: Pull out the two positioning pins 12, move the fixing block 9 upward, release the handle 7, and rotate the indexing plate 2 clockwise or counterclockwise by one angle. The angle is equal to the central angle of the two sets of guide vanes that have been installed on the diffuser inner casing 14. This will move the next batch of the same number of two sets of front guide vane mounting slots and rear guide vane mounting slots to the position in step 2. Repeat steps 2 to 5 to complete the installation of the remaining guide vanes on the diffuser inner casing 14.

[0062] In Example 2, assembly efficiency can be further improved by assembling 3, 4 or even more sets of guide vanes at once in step two. At this time, it is necessary to adjust the shape of the pin 13 (from straight to curved) and adjust the distance between the pin holes to an integer multiple of D.

[0063] The control device and control method of the present invention are designed according to the structural characteristics of the diffuser and are used for the guide vane gap control before the overall brazing of the diffuser. The principle is to control the position of the first group of blades by fixing pins, and then control the gap between adjacent guide vanes by using pins. Then, one or more groups are fixed and the blades are positioned and welded to the diffuser inner casing 14 by using a positioning welding method. Then, the next group or more groups of guide vanes are installed by rotating the indexing plate 2 until all guide vanes are assembled.

[0064] After the blade assembly spacing is fixed using the control method of this invention, it is found that the gap between the guide vanes meets the design requirements by 100%. After the guide vanes are assembled using this invention, the parts are brazed as a whole. After welding, the guide vanes are checked again with go and no-go gauges, and the gap between the blades is also 100% qualified, meeting the design requirements. The parts can be delivered in good condition.

[0065] Contents not described in detail in this specification are prior art known to those skilled in the art. Although illustrative specific embodiments of the invention have been described above to facilitate understanding by those skilled in the art, it should be understood that the invention is not limited to the scope of the specific embodiments. Various modifications are readily apparent to those skilled in the art as long as they fall within the spirit and scope of the invention as defined and determined by the appended claims, and all inventions utilizing the concept of this invention are protected.

Claims

1. A device for controlling the inter-blade gap of a multi-row expander vane prior to integral brazing, characterized by: include, Indexing plate (2); Shaft (4), the shaft (4) coincides with the axis of the indexing plate (2), and the first end of the shaft (4) is fixedly connected to the indexing plate (2); Pressure plate (6), which is detachably connected to the second end of shaft (4); Top block (9), which is movably connected to one side of shaft (4), and the movement trajectory of top block (9) is a straight line perpendicular to shaft (4); Positioning pins (12), the two positioning pins (12) are located on both sides of the movement trajectory of the top block (9), and the outer diameter of the positioning pins (12) is equal to the design gap (17) between the adjacent front guide vane (15) and rear guide vane (16) on the inner casing (14) of the diffuser.

2. The device for controlling the inter-blade gap of the integral brazed front blades of the multiple sets of guide vanes of the diffuser according to claim 1, characterized in that: It also includes, Chassis (1); The upright plate (3) is vertically connected to the upper end face of the chassis (1), and the indexing plate (2) is fixed to the surface of the upright plate (3). Support plate (8) and clamping bolt (10), the support plate (8) is connected to the vertical plate (3) and located above the indexing plate (2), the clamping bolt (10) is threadedly connected to the support plate (8) and the end of the clamping bolt (10) is connected to the top block (9); A pin (13) is inserted into the upright plate (3). The pin (13) has at least two pin holes for positioning pins (12), and the distance between two adjacent pin holes is an integer multiple of the interval distance D of the two adjacent design gaps (17) on the diffuser inner casing (14).

3. A method for controlling the inter-blade gap of a multi-row expander vane prior to integral brazing, characterized by: The apparatus of claim 1 is used, and includes the following steps: Step 1: Coaxially assemble the diffuser inner casing (14) onto the shaft (4) and press it onto the indexing plate (2) with the pressure plate (6) so that the diffuser inner casing (14) and the indexing plate (2) rotate synchronously. Step 2: Select a set of front guide vane mounting slots and rear guide vane mounting slots in the area directly above the diffuser inner casing (14) and install a front guide vane (15) and a rear guide vane (16) therein to complete the installation of the first set of guide vanes; Step 3: Insert two positioning pins (12) on both sides of the first set of guide vanes and keep them stationary. One positioning pin (12) is close to the front guide vane (15), and the other positioning pin (12) is close to the rear guide vane (16). The positioning pins (12) are parallel to the axis of the diffuser inner casing (14). The distance between the two positioning pins (12) is equal to the interval distance D of the two adjacent design gaps (17) on the diffuser inner casing (14). Step 4: Install one front guide vane (15) and one rear guide vane (16) in the front guide vane mounting slot and the rear guide vane mounting slot that are closest to the two positioning pins (12) in Step 3 and are not in the same group, and ensure that the front guide vane (15) and the rear guide vane (16) are tightly attached to their respective positioning pins (12); Step 5: Install another rear guide vane (16) in the same group as the front guide vane (15) in Step 4, and another front guide vane (15) in the same group as the rear guide vane (16) in Step 4, to complete the installation of the other two groups of guide vanes; Step 6: Move the top block (9) downwards so that the top block (9) presses against the three sets of guide vanes completed in steps 2 to 5, and fix the position of the three sets of guide vanes by tack welding; Step 7: Pull out the two positioning pins (12), move the top block (9) upward, and rotate the indexing plate (2) clockwise or counterclockwise by an angle equal to the central angle of the three sets of guide vanes that have been installed on the diffuser inner casing (14); Step 8: Select a set of front guide vane mounting slots and rear guide vane mounting slots that are closest to the already installed guide vanes and have not yet been fitted with guide vanes. Insert one of the locating pins (12) parallel to the axis of the diffuser inner casing (14) between the two slots, ensuring that the locating pin (12) is tightly against the already installed front guide vane (15) or rear guide vane (16). Then, install the front guide vane (15) and rear guide vane (16) in this set of front and rear guide vane mounting slots, ensuring that the front guide vane (15) or rear guide vane (16) in this set is tightly fitted. After installing the guide vanes, attach the positioning pin (12). Then, insert another positioning pin (12) between the guide vanes and the nearest guide vane mounting slot and the next guide vane mounting slot that has not yet been installed. The positioning pin (12) is parallel to the axis of the diffuser inner casing (14) and is pressed against the front guide vane (15) or the rear guide vane (16) in the guide vane group. Move the top block (9) downward so that the top block (9) presses the guide vane group together and performs positioning welding to position the guide vane group. Step nine, pull out the two positioning pins (12), move the top block (9) upward, and rotate the indexing plate (2) clockwise or counterclockwise by an angle equal to the central angle of the two adjacent sets of guide vanes on the diffuser inner casing (14). Then repeat steps eight and nine to complete the installation of the remaining guide vanes on the diffuser inner casing (14).

4. A method for controlling blade clearance before integral brazing of multiple guide vanes in a diffuser, characterized in that: The apparatus of claim 1 is used, and includes the following steps: Step 1: Coaxially assemble the diffuser inner casing (14) onto the shaft (4) and press it onto the indexing plate (2) with the pressure plate (6) so that the diffuser inner casing (14) and the indexing plate (2) rotate synchronously. Step 2: Select multiple sets of consecutive adjacent front guide vane mounting slots and rear guide vane mounting slots in the area directly above the diffuser inner casing (14) and install the front guide vane (15) and rear guide vane (16) in them; Step 3: Move the top block (9) downwards so that it presses against the upper ends of all the front guide vanes (15) and rear guide vanes (16) installed in Step 2. Insert a locating pin (12) parallel to the axis of the diffuser inner casing (14) and press it against the outermost front guide vane (15) or rear guide vane (16) of the multiple sets of guide vanes. Use another locating pin (12) to check whether the interval between adjacent sets of guide vanes is equal to the design gap (17). If they are equal, insert the locating pin (12) along the axis of the diffuser inner casing (14) to the outer side of the set of guide vanes that is farthest from the first locating pin (12) and press it against the front guide vane (15) or rear guide vane (16) in that set of guide vanes. If they are not equal, move the front guide vane (15) or rear guide vane (16) on both sides or one side of the locating pin (12) until they are equal. Step 4: Keep the two locating pins (12) in place and fix the positions of multiple sets of guide vanes by tack welding; Step 5: Pull out the two positioning pins (12), move the top block (9) upward, and rotate the indexing plate (2) clockwise or counterclockwise by an angle equal to the central angle of the multiple sets of guide vanes that have been installed on the diffuser inner casing (14). This will allow the next batch of the same number of front guide vane mounting slots and rear guide vane mounting slots to move to the position in step 2. Repeat steps 2 to 5 to complete the installation of the remaining guide vanes on the diffuser inner casing (14).

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