A radial diffuser screw seat welding fixture and use method thereof

Abstract

The invention relates to a radial diffuser screw seat welding fixture and a method for using the radial diffuser screw seat welding fixture. The radial diffuser screw seat welding fixture comprises an upper seat, a lower seat, and a positioning screw matched with the screw seat thread. The upper seat comprises an upper seat ring body and an upper seat ring platform that are integrally formed, and the lower seat comprises a lower seat ring body and a lower seat ring platform that are integrally formed. Five positioning seats that protrude radially are evenly distributed on the side walls of the upper seat ring body and the side walls of the lower seat ring body. A circular screw seat accommodating groove is set through the center of each positioning seat. Each screw seat accommodating groove is placed on the same circumference. A receiving crossbeam is radially arranged in the screw seat accommodating groove. A central through hole that matches the shape of the screw seat is set at the center of the receiving crossbeam. Fan-shaped spot welding grooves are formed on both sides of the receiving crossbeam. Positioning pin holes are set on both sides of the central through hole. Shallow arc grooves are set on both sides of the flange of the screw seat.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine parts, in particular to a radial diffuser screw seat welding fixture and a use method thereof. Background Art

[0002] The radial diffuser assembly consists of radial diffuser, screw seat and other parts. Figure 1 As shown, the radial diffuser includes an upper ring piece 1, a lower ring piece 3 and a plurality of guide vanes 2. The upper and lower ring pieces of the radial diffuser each have five evenly distributed screw seats 4. The screw seats 4 of the upper ring piece 1 correspond to the screw seats 4 of the lower ring piece 3. The screw seats 5 are connected to the upper and lower ring pieces of the radial diffuser by welding. Figure 2 As shown, the screw seat 4 includes a thinner circular flange portion 42 and a cylindrical threaded portion 41, and the periphery of the flange portion 42 is used for welding. In production, the height of the screw seat position determines whether there is interference in the assembly of the radial diffuser assembly; currently, when welding the screw seat to the upper and lower rings of the radial diffuser, our company adopts the screw seat outer diameter positioning method for welding. However, due to the low coaxiality between the inner threaded hole of the screw seat and the outer contour, the position of the screw seat on the radial diffuser cannot be guaranteed, affecting the assembly of the radial diffuser assembly. The drawing requires that the position of the center of the inner threaded hole of the screw seat must be less than φ0.5mm, but the actual measured position exceeds φ1mm, which seriously affects the assembly. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a radial diffuser screw seat welding fixture with a simple structure and high welding position accuracy and a use method thereof.

[0004] In order to solve the above technical problems, the present invention provides a radial diffuser screw seat welding fixture, comprising an upper seat, a lower seat, and a positioning screw matched with the screw seat thread, the upper seat comprises an upper seat ring body and an upper seat ring platform that are integrally formed, the lower seat comprises a lower seat ring body and a lower seat ring platform that are integrally formed, and 5 radially protruding positioning seats are evenly distributed on the side walls of the upper seat ring body and the side walls of the lower seat ring body, and a circular screw seat accommodating groove is set through the center of each positioning seat, and each screw seat accommodating groove is placed on the same circumference, and a receiving cross beam is radially arranged in the screw seat accommodating groove, and a central through hole that matches the shape of the screw seat is set in the center of the receiving cross beam, and the receiving cross beam is connected to the screw seat. Fan-shaped spot welding grooves are formed on both sides of the beam, positioning pin holes are arranged on both sides of the center through hole, and shallow arc grooves are arranged on both sides of the flange part of the screw seat. When in use, the threaded part of the screw seat extends into the center through hole, and a positioning pin is protruded in the positioning pin hole, and the positioning pin is inserted into the shallow arc groove of the flange part. The positioning screw extends into the center through hole and is threadedly connected with the screw seat. The screw seat is limited by the positioning pin and the positioning screw, so that the flange part of the screw seat is placed at the port of the center through hole, and the upper seat ring platform of the upper seat and the lower seat ring platform of the lower seat are inserted into the radial diffuser, so that the upper ring piece of the radial diffuser is tightly against the positioning seat on the upper seat, and the lower ring piece of the radial diffuser is tightly against the positioning seat on the lower seat.

[0005] Furthermore, the central through hole includes a frustum portion, a cylindrical portion and a through hole portion, the inner diameter of the opening end of the frustum portion is not larger than the outer diameter of the flange portion of the screw seat, the inner diameter of the cylindrical portion is larger than the outer diameter of the threaded portion, and the through hole portion is clearance-matched with the positioning screw so that when the threaded portion of the screw seat extends into the central through hole, the flange portion of the screw seat is placed at the opening end of the frustum portion.

[0006] Furthermore, the upper seat ring platform is convexly arranged, and the lower seat ring platform is concavely arranged, so that the upper seat ring platform and the lower seat ring platform are sleeved and matched.

[0007] Furthermore, the outer diameter of the lower seat ring is smaller than the inner diameter of the radial diffuser, so that when the radial diffuser is sleeved with the upper seat ring and the lower seat ring, the outer wall of the lower seat ring is gap-matched with the inner wall of the radial diffuser.

[0008] Furthermore, the radial diffuser screw seat welding fixture also includes a radial positioning screw, a radial screw hole that cooperates with the radial positioning screw thread is arranged on the upper seat ring platform, and an avoidance groove is arranged on the lower seat ring platform, so that after the upper seat ring platform and the lower seat ring platform are sleeved, the radial positioning screw can extend out of the upper seat ring platform and the lower seat ring platform and abut against the guide vane of the radial diffuser.

[0009] Furthermore, the radial diffuser screw seat welding fixture also includes an angular locating pin, an angular locating hole adapted to the angular locating pin is axially arranged on the upper seat ring platform, and a lower seat locating hole corresponding to the angular locating hole is arranged on the lower seat ring body, so that when the upper seat and the lower seat are placed at both ends of the radial diffuser after assembly, the angular locating pin is inserted into the corresponding angular locating hole and the lower seat locating hole to ensure the angular position of the upper seat and the lower seat.

[0010] Furthermore, the radial diffuser screw seat welding fixture also includes a clamping screw, and the upper seat ring platform is evenly distributed with a plurality of upper seat clamping screw holes that cooperate with the clamping screw threads, and the lower seat ring body is evenly distributed with a plurality of lower seat clamping screw holes that correspond one to one with the upper seat clamping screw holes, so that the upper seat and the lower seat can be threadedly connected by the clamping screw after assembly.

[0011] The method for using the radial diffuser screw seat welding fixture comprises the following steps:

[0012] A. Insert the protruding positioning pins into each positioning pin hole, and place the five screw seats into the five screw seat receiving grooves of the lower seat respectively. The threaded part of the screw seat extends into the cylindrical part, and the flange part of the screw seat is placed at the open end of the frustum part. The shallow arc groove of the flange part of each screw seat is inserted into the positioning pin, and the screw seat is preliminarily positioned by the positioning pin.

[0013] B. Screw the positioning screws from the through-hole portion of each center through hole into the center through hole, so that the positioning screws are threadedly connected with the screw seat, and the screw seat is accurately positioned by the positioning screws and the positioning pins on both sides.

[0014] C. Sleeve the radial diffuser on the lower seat ring platform of the lower seat so that the lower ring sheet of the radial diffuser is in close contact with the positioning seat of the lower seat.

[0015] D. Place the five screw seats into the five screw seat receiving grooves of the upper seat respectively, with the threaded portion of the screw seat extending into the cylindrical portion, the flange portion of the screw seat placed at the open end of the frustum portion, and the shallow arc groove of each screw seat flange inserted into the positioning pin, and the screw seat is preliminarily positioned by the positioning pin; screw the positioning screw from the through hole portion of each center through hole into the center through hole, so that the positioning screw is threadedly connected to the screw seat, and the screw seat is accurately positioned by the positioning screw and the positioning pins on both sides.

[0016] E. Invert the assembled radial diffuser and lower seat so that the upper seat ring of the upper seat is inserted into the lower seat ring, and the upper ring of the radial diffuser is in close contact with the positioning seat of the upper seat.

[0017] F. Rotate the upper seat so that the lower seat positioning hole of the lower seat is aligned with the angular positioning hole of the upper seat, and insert the angular positioning pin into the lower seat positioning hole and the angular positioning hole to ensure that the screw seat of the upper seat is aligned with the screw seat of the lower seat.

[0018] G. Rotate the radial diffuser and adjust the circumferential position of the radial diffuser so that the screw seat is in the preset assembly position of the radial diffuser. Screw in the radial positioning screw so that the radial positioning screw abuts against the guide vane to prevent the radial diffuser from rotating. Screw the clamping screw into the clamping screw hole of the upper seat and the clamping screw hole of the lower seat so that the upper seat and the lower seat fix the radial diffuser.

[0019] H. Fix the flange of each screw seat to the radial diffuser by spot welding through the spot welding groove; remove the upper seat and the lower seat, and fully weld the periphery of the flange of each screw seat to the radial diffuser.

[0020] Technical effects of the invention: (1) Compared with the prior art, the radial diffuser screw seat welding fixture of the present invention has positioning seats on the side walls of the upper seat and the lower seat, and the screw seat accommodating grooves are arranged on the positioning seats, so that the screw seat is first positioned in the upper seat and the lower seat, and the screw seat can be straightened and positioned by using the central through hole and positioning pins arranged on the receiving crossbeam to ensure the assembly accuracy of the screw seat; (2) The setting of the spot welding groove can be used to perform preliminary welding on the screw seat, so that after the screw seat is fixed by welding, the upper seat and the lower seat can be removed and then full welding can be performed; (3) The setting of the radial positioning screws can be used to perform angular positioning of the radial diffuser and the upper seat and the lower seat to avoid the radial diffuser rotating during the welding process and causing the welding position to shift; (4) The setting of the angular positioning pins can ensure that the screw seat of the upper seat and the screw seat of the lower seat are arranged one by one. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of the radial diffuser assembly;

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the screw seat;

[0024] Figure 3 This is a schematic diagram of the structure of the upper seat;

[0025] Figure 4 It is a partial enlarged schematic diagram of the positioning seat;

[0026] Figure 5 It is a schematic diagram of the cross-sectional structure of the upper seat;

[0027] Figure 6 It is a schematic diagram of the structure of the lower seat;

[0028] Figure 7 It is a schematic diagram of the cross-sectional structure after the upper seat, radial diffuser and lower seat are assembled;

[0029] Figure 8 It is a schematic diagram of the structure of the positioning screw;

[0030] Fig. 9 It is a schematic diagram of the structure of a radial positioning screw.

[0031] In the figure: upper ring piece 1, guide vane 2, lower ring piece 3, screw seat 4, threaded portion 41, flange portion 42, upper seat 5, upper seat ring body 51, upper seat ring platform 52, positioning seat 53, angular positioning hole 54, radial screw hole 55, upper seat clamping screw hole 56, screw seat accommodating groove 6, spot welding groove 61, center through hole 62, positioning pin hole 63, receiving beam 64, frustum portion 65, cylindrical portion 66, through hole portion 67, radial positioning screw 7, lower seat 8, angular positioning pin 81, positioning screw 82, lower seat positioning hole 83, clamping screw 84. DETAILED DESCRIPTION

[0032] Example 1

[0033] like Figures 3 to 9 As shown, the radial diffuser screw seat welding fixture of this embodiment includes an upper seat 5, a lower seat 8, and a positioning screw 82 threadedly matched with the screw seat 4. The upper seat 5 includes an upper seat ring body 51 and an upper seat ring platform 52 that are integrally formed. The upper seat ring body 51 is annular, and the upper seat ring platform 52 is protrudingly arranged at the front end of the upper seat ring body 51 so that an upper seat step is formed between the upper seat ring platform 52 and the upper seat ring body 51. The lower seat 8 includes a lower seat ring body and a lower seat ring platform that are integrally formed. The lower seat ring platform is concavely arranged so that a lower seat step is formed between the lower seat ring platform and the lower seat ring body, and the upper seat ring platform 52 and the lower seat ring platform can be sleeved and matched; the outer diameter of the lower seat ring platform is smaller than the inner diameter of the radial diffuser (i.e., the inner diameter of the upper ring sheet 1 and the lower ring sheet 3), so that when the radial diffuser is sleeved with the upper seat ring platform 52 and the lower seat ring platform, the upper seat ring platform 52 extends into the lower seat ring platform, and the outer wall of the lower seat ring platform and the inner wall of the radial diffuser are gap-matched.

[0034] Five radially protruding positioning seats 53 are evenly distributed on the side walls of the upper ring body 51 and the side walls of the lower ring body. A circular screw seat accommodating groove 6 is set through the center of each positioning seat 53. Each screw seat accommodating groove 6 is placed on the same circumference. A receiving crossbeam 64 is radially arranged in the screw seat accommodating groove 6. A central through hole 62 that matches the shape of the screw seat 4 is arranged at the center of the receiving crossbeam 64. The central through hole 62 includes a frustum portion 65, a cylindrical portion 66 and a through hole portion 67. The inner diameter of the open end of the frustum portion 65 is not larger than the outer diameter of the screw seat flange portion 42, and the inner diameter of the cylindrical portion 66 is larger than the outer diameter of the threaded portion 41. The through hole portion 67 is clearance-matched with the positioning screw 82, and fan-shaped spot welding grooves 61 are formed on both sides of the receiving crossbeam 64. Locating pin holes 63 are respectively provided on both sides of the central through hole 62, and shallow arc grooves are provided on both sides of the flange portion 42 of the screw seat 4. When in use, the threaded portion 41 of the screw seat 4 extends into the central through hole 62, and a locating pin is protruding from the locating pin hole 63, and the locating pin is inserted into the shallow arc groove of the flange portion 42. The locating screw 82 extends into the central through hole 62 and is threadedly connected with the screw seat 4. The screw seat 4 is limited by the locating pin and the locating screw 82, so that the flange portion 42 of the screw seat 4 is placed at the open end of the frustum portion 65, and the upper seat ring platform 52 of the upper seat 5 and the lower seat ring platform of the lower seat 8 are inserted into the radial diffuser, so that the upper ring plate 1 of the radial diffuser is tightly against the locating seat 53 on the upper seat 5, and the lower ring plate 3 of the radial diffuser is tightly against the locating seat on the lower seat 8.

[0035] In order to prevent the upper seat 5, the lower seat 8 and the radial diffuser from rotating after assembly, the radial diffuser screw seat welding fixture also includes a radial positioning screw, a radial screw hole that cooperates with the radial positioning screw thread is arranged on the upper seat ring platform, and an avoidance groove is arranged on the lower seat ring platform, so that after the upper seat ring platform and the lower seat ring platform are sleeved, the radial positioning screw can extend out of the upper seat ring platform and the lower seat ring platform and abut against the guide vane of the radial diffuser.

[0036] In order to ensure that the screw seats of the upper ring plate and the lower ring plate of the radial diffuser correspond one to one during assembly, the radial diffuser screw seat welding fixture also includes an angular positioning pin 81, an angular positioning hole 54 compatible with the angular positioning pin 81 is axially arranged on the upper seat ring platform 52, and a lower seat positioning hole 83 corresponding to the angular positioning hole 54 is arranged on the lower seat ring body, so that when the upper seat 5 and the lower seat 8 are placed at both ends of the radial diffuser after assembly, the angular positioning pin 81 is inserted into the corresponding angular positioning hole 54 and the lower seat positioning hole 83 to ensure the angular position relationship between the upper seat 5 and the lower seat 8.

[0037] The radial diffuser screw seat welding fixture also includes 6 clamping screws 84, 6 upper seat clamping screw holes 56 threadedly matched with the clamping screws 84 are evenly distributed on the upper seat ring platform 52, and 6 lower seat clamping screw holes corresponding to the upper seat clamping screw holes 56 are evenly distributed on the lower seat ring body, so that the upper seat 5 and the lower seat 8 can be threadedly connected by the clamping screws 84 after assembly to fix the upper seat 5 and the lower seat 8.

[0038] Example 2

[0039] The method for using the radial diffuser screw seat welding fixture described in Example 1 comprises the following steps:

[0040] A. Insert the protruding positioning pins into each positioning pin hole 63, and place the five screw seats 4 into the five screw seat receiving grooves 6 of the lower seat 8 respectively. The threaded portion 41 of the screw seat 4 extends into the cylindrical portion 66, and the flange portion 42 of the screw seat 4 is placed at the open end of the frustum portion 65. The shallow arc groove of each screw seat flange portion 42 is clamped into the positioning pin, and the screw seat 4 is preliminarily positioned by the positioning pin.

[0041] B. Screw the positioning screw 82 into the central through hole 62 through the through hole portion 67 of each central through hole 62, so that the positioning screw 82 is threadedly connected to the screw seat 4, and the screw seat 4 is accurately positioned by the positioning screw 82 and the positioning pins on both sides.

[0042] C. Sleeve the radial diffuser on the lower seat ring platform of the lower seat 8 so that the lower ring sheet 3 of the radial diffuser is in close contact with the positioning seat 53 of the lower seat 8.

[0043] D. Place the five screw seats 4 into the five screw seat receiving grooves 61 of the upper seat 5 respectively, with the threaded portion 41 of the screw seat 4 extending into the cylindrical portion 66, and the flange portion 42 of the screw seat 4 being placed at the open end of the frustum portion 65, and the shallow arc groove of each screw seat flange portion 42 being inserted into the positioning pin, and the screw seat 4 is preliminarily positioned by the positioning pin; screw the positioning screw 82 into the center through hole 62 from the through hole portion 67 of each center through hole 62, so that the positioning screw 82 is threadedly connected with the screw seat 4, and the screw seat 4 is accurately positioned by the positioning screw 82 and the positioning pins on both sides.

[0044] E. Invert the assembled radial diffuser and lower seat 8 so that the upper seat ring platform 82 of the upper seat 5 is inserted into the lower seat ring platform, and the upper ring plate 1 of the radial diffuser is tightly against the positioning seat 53 of the upper seat 5.

[0045] F. Rotate the upper seat 5 so that the lower seat positioning hole 83 of the lower seat 8 is aligned with the angular positioning hole 54 of the upper seat 5, and insert the angular positioning pin 81 into the lower seat positioning hole 83 and the angular positioning hole 54 to ensure that the screw seat 4 of the upper seat 5 and the screw seat 4 of the lower seat 8 are aligned.

[0046] G. Rotate the radial diffuser and adjust the circumferential position of the radial diffuser so that the screw seat 4 is in the preset assembly position of the radial diffuser (need to avoid the position of the guide vane 3), screw in the radial positioning screw 7 so that the radial positioning screw 7 abuts against the guide vane 3 to prevent the radial diffuser from rotating; screw the clamping screw 84 into the upper seat clamping screw hole 56 and the lower seat clamping screw hole so that the upper seat 5 and the lower seat 8 fix the radial diffuser;

[0047] H. Fix the flange 42 of each screw seat 4 to the radial diffuser by spot welding through the spot welding groove 61; remove the upper seat 5 and the lower seat 8, and fully weld the periphery of the flange 42 of each screw seat to the radial diffuser.

[0048] When the fixture was used for welding, the radial diffuser and screw seat were measured after welding. The measurement results showed that the screw seat position accuracy was about φ0.3mm. Compared with the original welding method, the accuracy was greatly improved and met the design requirements.

[0049] Obviously, the above embodiments are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. A method for using a radial diffuser screw seat welding fixture, characterized in that: The clamp includes an upper seat, a lower seat, and a positioning screw matched with the screw seat thread. The upper seat includes an upper seat ring body and an upper seat ring platform that are integrally formed. The lower seat includes a lower seat ring body and a lower seat ring platform that are integrally formed. Five positioning seats that protrude radially are evenly distributed on the side walls of the upper seat ring body and the side walls of the lower seat ring body. A circular screw seat accommodating groove is set through the center of each positioning seat. Each screw seat accommodating groove is placed on the same circumference. A receiving crossbeam is radially set in the screw seat accommodating groove. A central through hole that matches the shape of the screw seat is set in the center of the receiving crossbeam. Fan-shaped spot welding grooves are formed on both sides of the receiving crossbeam. , positioning pin holes are arranged on both sides of the center through hole, shallow arc grooves are arranged on both sides of the flange part of the screw seat, when in use, the threaded part of the screw seat extends into the center through hole, a positioning pin is protruded in the positioning pin hole, and the positioning pin is clamped into the shallow arc groove of the flange part, the positioning screw extends into the center through hole and is threadedly connected with the screw seat, the screw seat is limited by the positioning pin and the positioning screw, so that the flange part of the screw seat is placed at the port of the center through hole, the upper seat ring platform of the upper seat and the lower seat ring platform of the lower seat are inserted into the radial diffuser, so that the upper ring piece of the radial diffuser is closely attached to the positioning seat on the upper seat, and the lower ring piece of the radial diffuser is closely attached to the positioning seat on the lower seat; The central through hole comprises a frustum portion, a cylinder portion and a through hole portion, the inner diameter of the opening end of the frustum portion is not larger than the outer diameter of the flange portion of the screw seat, the inner diameter of the cylinder portion is larger than the outer diameter of the threaded portion, and the through hole portion is clearance-matched with the positioning screw, so that when the threaded portion of the screw seat extends into the central through hole, the flange portion of the screw seat is placed at the opening end of the frustum portion; The upper ring platform is convexly arranged, and the lower ring platform is concavely arranged, so that the upper ring platform and the lower ring platform are sleeved and matched; The outer diameter of the lower seat ring is smaller than the inner diameter of the radial diffuser, so that when the radial diffuser is sleeved with the upper seat ring and the lower seat ring, the outer wall of the lower seat ring is in clearance with the inner wall of the radial diffuser; The radial diffuser screw seat welding fixture further comprises a radial positioning screw, a radial screw hole matched with the thread of the radial positioning screw is arranged on the upper seat ring platform, and an avoidance groove is arranged on the lower seat ring platform, so that after the upper seat ring platform and the lower seat ring platform are sleeved, the radial positioning screw can extend out of the upper seat ring platform and the lower seat ring platform and abut against the guide vane of the radial diffuser; The radial diffuser screw seat welding fixture further comprises an angular positioning pin, an angular positioning hole adapted to the angular positioning pin is axially arranged on the upper seat ring platform, and a lower seat positioning hole corresponding to the angular positioning hole is arranged on the lower seat ring body, so that when the upper seat and the lower seat are placed at both ends of the radial diffuser after assembly, the angular positioning pin is inserted into the corresponding angular positioning hole and the lower seat positioning hole; The radial diffuser screw seat welding fixture further comprises a clamping screw, a plurality of upper seat clamping screw holes which are threadedly matched with the clamping screw are evenly distributed on the upper seat ring platform, and a plurality of lower seat clamping screw holes which are one-to-one corresponding to the upper seat clamping screw holes are evenly distributed on the lower seat ring body, so that the upper seat and the lower seat are threadedly connected by the clamping screw after being assembled; The method for using the radial diffuser screw seat welding fixture comprises the following steps: A. Insert the protruding positioning pins into each positioning pin hole, and place the five screw seats into the five screw seat receiving grooves of the lower seat respectively. The threaded part of the screw seat extends into the cylindrical part, and the flange part of the screw seat is placed at the open end of the frustum part. The shallow arc groove of the flange part of each screw seat is inserted into the positioning pin, and the screw seat is preliminarily positioned by the positioning pin; B. Screw the positioning screws into the central through holes from the through hole parts of each central through hole, so that the positioning screws are threadedly connected with the screw seats, and the screw seats are accurately positioned by the positioning screws and the positioning pins on both sides; C. Sleeve the radial diffuser on the lower seat ring platform of the lower seat, so that the lower ring sheet of the radial diffuser is in close contact with the positioning seat of the lower seat; D. Place the five screw seats into the five screw seat receiving grooves of the upper seat respectively, with the threaded portion of the screw seat extending into the cylindrical portion, the flange portion of the screw seat placed at the open end of the frustum portion, and the shallow arc groove of each screw seat flange portion inserted into the positioning pin, and the screw seat is initially positioned by the positioning pin; screw the positioning screw from the through hole portion of each central through hole into the central through hole, so that the positioning screw is threadedly connected with the screw seat, and the screw seat is accurately positioned by the positioning screw and the positioning pins on both sides; E. Invert the assembled radial diffuser and lower seat so that the upper seat ring of the upper seat is inserted into the lower seat ring, and the upper ring of the radial diffuser is in close contact with the positioning seat of the upper seat; F. Rotate the upper seat so that the lower seat positioning hole of the lower seat is aligned with the angular positioning hole of the upper seat, and insert the angular positioning pin into the lower seat positioning hole and the angular positioning hole to ensure that the screw seat of the upper seat is aligned with the screw seat of the lower seat; G. Rotate the radial diffuser and adjust the circumferential position of the radial diffuser so that the screw seat is in the preset assembly position of the radial diffuser, screw in the radial positioning screw so that the radial positioning screw abuts against the guide vane to prevent the radial diffuser from rotating; screw the clamping screw into the clamping screw hole of the upper seat and the clamping screw hole of the lower seat so that the upper seat and the lower seat fix the radial diffuser; H. Fix the flange of each screw seat to the radial diffuser by spot welding through the spot welding groove; remove the upper seat and the lower seat, and fully weld the periphery of the flange of each screw seat to the radial diffuser.

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