An assembly structure of a rotor and a stator

Abstract

This invention relates to the field of aero-engine technology and discloses an assembly structure for a rotor and stator, comprising: an mounting groove on the annular inner ring of the stator; an inner ring of a sealing ring serving as a sealing portion and an outer ring serving as a base portion; the base portion overlapping the inner ring of the stator; a through hole adapted to the mounting groove on the base portion; the sealing portion spaced around the rotor; a gap of Δ2 between the sealing portion and the rotor; a connecting assembly passing through the through hole and the mounting groove to assemble the sealing ring onto the stator; the connecting assembly being adapted to adjust the connection length to adjust the axial gap Δ3 between the stator and the sealing ring along the rotor axis, such that Δ3 is half of Δ2. This application, by adjusting the connection length of the connecting assembly, adjusts the axial gap between the stator and the sealing ring to obtain a suitable gap, preventing uneven wear, improving the stability of the aero-engine, extending the service life of aero-engine parts, reducing maintenance costs, and improving the reliability and economy of the aero-engine structure.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and more specifically to an assembly structure for a rotor and a stator. Background Technology

[0002] In existing rotor-stator sealing structures, the position of the stator components is completely fixed during assembly. However, during high-speed operation, the rotor components experience increased deflection, leading to localized uneven wear on the stator components. As the rotor components deflect less, leakage at the uneven wear points on the stator components increases, resulting in reduced aero-engine performance, shorter service life of aero-engine components, increased maintenance costs, and severely compromised reliability and economic efficiency of aero-engine operation. Summary of the Invention

[0003] In view of this, the present invention provides an assembly structure for a rotor and a stator to solve the problem that in the existing rotor-stator sealing structure, the position of the stator parts is completely fixed during the assembly process; while the rotor parts undergo localized wear due to increased deflection during high-speed operation; and after the rotor parts deflection decreases, leakage at the wear point of the stator parts increases, resulting in reduced aero-engine performance, reduced service life of aero-engine parts, increased maintenance costs, and seriously reduced reliability and economy of aero-engine structure operation.

[0004] This invention provides an assembly structure for a rotor and a stator, comprising:

[0005] The stator is annular, with multiple mounting slots spaced apart on the inner ring of the stator.

[0006] The sealing ring is annular, with the inner ring being the sealing part and the outer ring being the base part; the base part overlaps with the inner ring of the stator; and the base part has a through hole that matches the mounting groove on the stator.

[0007] The rotor has sealing portions arranged around it at intervals; the gap between the sealing portions and the rotor is Δ2.

[0008] A connecting assembly, partially penetrating the through hole and mounting groove, assembles the sealing ring onto the stator; the connecting assembly is adapted to adjust the connecting length to adjust the axial clearance Δ3 between the stator and the sealing ring along the rotor axis, such that Δ3 is half of Δ2.

[0009] Optionally, the connection component includes:

[0010] A sleeve partially penetrates the through hole and the mounting groove, and one end of the sleeve is provided with a first step; an axial gap Δ3 is formed between the inner end of the first step and the end face of the stator, or an axial gap Δ3 is formed between the stator and the sealing ring;

[0011] A rivet penetrates the sleeve, with the head end of the rivet contacting the outer end of the first step; the riveting end of the rivet contacts the other end of the sleeve.

[0012] A washer is fitted onto the sleeve, and the washer is located between the riveting end of the rivet and the outer end face of the base portion of the sealing ring.

[0013] The assembly structure of the rotor and stator is adapted to obtain the required axial clearance Δ3 by grinding the other end face of the sleeve.

[0014] Optionally, the inner end of the washer is connected to the base of the sealing ring by spot welding; the outer end of the washer is connected to the riveting end of the rivet by spot welding. Beneficial effects: This application adopts the above technical solution, improving structural strength and reliability through spot welding.

[0015] Optionally, three inclined grooves are evenly distributed around the outer periphery of the washer. One inclined groove is suitable for indicating the position where the outer end of the washer is spot-welded to the riveting end of the rivet; the other two inclined grooves are suitable for indicating the position where the inner end of the washer is spot-welded to the base of the sealing ring. Beneficial effects: The above technical solution ensures the operability of the welding process, the convenience of inspection, and the consistency of the amount of movement.

[0016] Optionally, a gap Δ1 is reserved between the sleeve and the bottom end of the mounting groove, wherein Δ1 is equal to Δ2.

[0017] Optionally, by grinding the outer circumferential surface of the sleeve to increase the gap Δ4 between the sleeve and the through hole on the base, the radial movement between the sealing ring and the stator is obtained, wherein Δ4 is ​​not less than 1 / 5 of Δ2; and the radial movement is twice Δ2.

[0018] Optionally, the stator is an annular leaf cascade.

[0019] Optionally, the sealing part is a honeycomb component or a wear-resistant coating.

[0020] Optionally, a radial margin between the rotor and the stator can be reserved by controlling the width L1 of the mounting groove and the distance L2 between the bottom of the mounting groove and the center of symmetry of the stator.

[0021] Optionally, the connection component includes:

[0022] A custom bolt partially penetrates the through hole and the mounting groove; one end of the custom bolt has a second step; the other end of the custom bolt is a threaded end; an axial clearance Δ3 is formed between the inner end of the second step and the end face of the stator, or an axial clearance Δ3 is formed between the stator and the sealing ring;

[0023] A nut is installed on the threaded end of the custom bolt;

[0024] The assembly structure of the rotor and stator is adapted to obtain the required axial clearance Δ3 by grinding the inner end face of the second step.

[0025] Compared with the prior art, the above-mentioned technical solution of this application has the following significant beneficial technical effects:

[0026] 1. The rotor and stator assembly structure provided in this application includes: a stator, which is annular, with multiple mounting grooves spaced apart on the inner ring of the stator; a sealing ring, which is annular, with an inner ring as a sealing portion and an outer ring as a base portion; the base portion overlaps with the inner ring of the stator; a through hole adapted to the mounting grooves on the stator is provided on the base portion; a rotor, with the sealing portions spaced around the rotor; the gap between the sealing portions and the rotor is Δ2; a connecting assembly, partially penetrating the through hole and the mounting grooves, assembling the sealing ring onto the stator; the connecting assembly is adapted to adjust the connection length to adjust the axial gap Δ3 between the stator and the sealing ring along the rotor axis, such that Δ3 is half of Δ2. This application adopts the above technical solution, adjusting the axial gap Δ3 between the stator and the sealing ring along the rotor axis by adjusting the connection length of the connecting assembly, thereby obtaining a suitable gap, preventing uneven wear, improving the stability performance of the aero-engine, extending the service life of aero-engine parts, reducing usage and maintenance costs, and improving the reliability and economy of the aero-engine structure operation. Furthermore, the base does not suffer wear, while the sealing part can wear. During maintenance, only the sealing part needs to be replaced, while the base can be reused, thereby reducing the cost of use and maintenance.

[0027] 2. In this application, the inner end of the washer is connected to the base of the sealing ring by spot welding; the outer end of the washer is connected to the riveting end of the rivet by spot welding. This application adopts the above technical solution, improving structural strength and reliability through spot welding.

[0028] 3. This application provides three evenly distributed oblique grooves on the outer periphery of the gasket. One oblique groove is suitable for indicating the position where the outer end of the gasket is spot-welded to the riveting end of the rivet; the other two oblique grooves are suitable for indicating the position where the inner end of the gasket is spot-welded to the base of the sealing ring. This application employs the above technical solution to ensure the operability of the welding process, the convenience of inspection, and the consistency of the amount of movement. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a partial cross-sectional view of the stator provided in an embodiment of the present invention;

[0031] Figure 2 This is a cross-sectional view of the sleeve provided in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the sealing ring provided in an embodiment of the present invention;

[0033] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure at point AA;

[0034] Figure 5 This is a cross-sectional view of the rivet before assembly, as provided in an embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the structure of the gasket provided in an embodiment of the present invention;

[0036] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure at point BB;

[0037] Figure 8 This is a partial cross-sectional view of the assembly structure of the rotor and stator provided in an embodiment of the present invention.

[0038] Figure 9 for Figure 8 Schematic diagram of the cross-sectional structure at the middle CC Figure 1 ;

[0039] Figure 10 for Figure 8 Schematic diagram of the cross-sectional structure at the middle CC Figure 2 ;

[0040] Figure 11 This is a cross-sectional structural diagram of the custom bolt provided in an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Stator; 2. Mounting groove; 3. Sealing ring; 4. Sealing part; 5. Base part; 6. Through hole; 7. Rotor; 8. Sleeve; 9. Rivet; 10. Washer; 11. Inclined groove; 12. Custom bolt; 13. Second step; 14. Threaded stop. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] like Figures 1 to 11 One specific embodiment of the rotor and stator assembly structure shown includes: stator 1, sealing ring 3, rotor 7, and connecting assembly.

[0045] like Figure 1 , Figure 3 , Figure 4 and Figure 9 As shown, the stator 1 is annular, with multiple mounting grooves 2 spaced apart on its inner ring. The diameter of the inner ring of the stator 1 is Φ1, ensuring that the movement of the stator 1 is within a safe range. The mounting grooves 2 are radially arranged slots, and the multiple mounting grooves 2 are evenly distributed, with a maximum number of six. The sealing ring 3 is annular, with the inner ring of the sealing ring 3 being the sealing part 4 and the outer ring of the sealing ring 3 being the base part 5; the base part 5 does not bear wear, while the sealing part 4 is wear-resistant. The base part 5 overlaps with the inner ring of the stator 1; the base part 5 has through holes 6 that are adapted to the mounting grooves 2 on the stator 1, and the number of through holes 6 is the same as the number of mounting grooves 2. The sealing parts 4 are spaced around the rotor 7; the gap between the sealing parts 4 and the rotor 7 is Δ2. The connecting assembly partially penetrates the through hole 6 and the mounting groove 2, assembling the sealing ring 3 to the stator 1. The connecting assembly is adapted to adjust the connection length to adjust the axial clearance Δ3 between the stator 1 and the sealing ring 3 along the rotor 7 axis, such that Δ3 is half of Δ2. The diameter of the inner annular ring of the sealing ring 3 is R1, and the radius of the rotor 7 is R2.

[0046] Specifically, such as Figures 2 to 10 As shown, the connecting assembly includes: sleeves 8, rivets 9, and washers 10. The number of sleeves 8 is the same as the number of mounting slots 2. A portion of the sleeve 8 penetrates the through hole 6 and the mounting slot 2, and one end of the sleeve 8 is provided with a first step; an axial clearance Δ3 is formed between the inner end of the first step and the end face of the stator 1, as shown. Figure 10As shown; or an axial gap Δ3 is formed between the stator 1 and the sealing ring 3, such as Figure 9 As shown. Due to the axial clearance Δ3 between the sealing ring 3 and the stator 1, when the entire rotor and stator assembly structure undergoes maneuvering flight with the aero-engine and aircraft, the sealing ring 3 will move backward, and the structure at this time will be as follows. Figure 10 As shown. The rivet 9 penetrates the sleeve 8, and the cap end of the rivet 9 contacts the outer end of the first step; the riveting end of the rivet 9 contacts the other end of the sleeve 8. The washer 10 is sleeved on the sleeve 8, and the washer 10 is located between the riveting end of the rivet 9 and the outer end face of the base portion 5 of the sealing ring 3. The assembly structure of the rotor and stator is adapted to obtain a compliant axial clearance Δ3 by grinding the other end face of the sleeve 8. The rivet 9 is used to axially limit the sealing ring 3 and the stator 1. The washer 10 is used to protect the sealing ring 3.

[0047] Furthermore, such as Figure 9 As shown, the inner end of the washer 10 is connected to the base portion 5 of the sealing ring 3 by spot welding; the outer end of the washer 10 is connected to the riveting end of the rivet 9 by spot welding.

[0048] Specifically, such as Figure 6 and Figure 7 As shown, three inclined grooves 11 are evenly distributed on the outer periphery of the washer 10. One inclined groove 11 is suitable for indicating the position of the spot welding connection between the outer end of the washer 10 and the riveting end of the rivet 9; the other two inclined grooves 11 are suitable for indicating the position of the spot welding connection between the inner end of the washer 10 and the base portion 5 of the sealing ring 3.

[0049] Specifically, such as Figures 8 to 10 As shown, a gap Δ1 is reserved between the bottom end of the sleeve 8 and the mounting groove 2, and Δ1 is equal to Δ2.

[0050] Furthermore, during the manufacturing process, the dimensions and positions of parts inevitably have certain tolerance ranges, resulting in the amount of movement and clearance during assembly not necessarily equal to the theoretical estimate. Therefore, as... Figure 2 , Figure 8 , Figure 9 and Figure 10 As shown, when the radial movement of the sealing ring 3 after assembly is too small, the outer circumferential surface of the sleeve 8 is ground to increase the gap Δ4 between the sleeve 8 and the through hole 6 on the base part 5, thereby obtaining the radial movement between the sealing ring 3 and the stator 1. The Δ4 is ​​not less than 1 / 5 of Δ2; the radial movement is twice Δ2.

[0051] Specifically, such as Figure 1 As shown, the stator 1 is an annular cascade.

[0052] Specifically, the sealing part 4 is a honeycomb component or a wear-resistant coating.

[0053] Specifically, such as Figure 1 As shown, by controlling the width L1 of the mounting groove 2 and the distance L2 between the bottom of the mounting groove 2 and the center of symmetry of the stator 1, a radial margin is reserved between the rotor 7 and the stator 1.

[0054] In the specific assembly process: First, the annular blade, sealing ring 3, and sleeve 8 are stacked together in sequence, as follows: Figures 8 to 10 As shown, there is a reserved gap Δ1 between the sleeve 8 and the annular blade. Spot welding is performed between the sealing ring 3 and the washer 10. Spot welding is performed at two of the three circumferential positions of the inclined groove 11 on the washer 10, with the spot welding positions of each washer 10 being consistent. The rivet 9 is inserted into the sleeve 8, and the riveting procedure is performed to ensure that the axial gap Δ3 between the sealing ring 3 and the annular blade is qualified. If Δ3 is too large, the left end face of the sleeve 8 is ground; if Δ3 is too small, a new sleeve 8 is replaced. Spot welding is performed between the riveting end of the rivet 9 and the washer 10. The spot welding position is the third inclined groove 11 of each washer 10. After spot welding, the sealing ring 3, sleeve 8, washer 10, and rivet 9 form a mutually fixed assembly. The sealing ring 3 is manually moved to check the radial movement of the sealing ring 3 relative to the inner ring of the annular blade. If the radial movement is qualified, the entire assembly is complete. If the radial movement is not up to standard, remove rivet 9, grind the outer circumferential surface of sleeve 8 to increase the fitting clearance Δ4, replace rivet 9 with a new one, and reassemble until the radial movement is up to standard. Manually checking the radial movement of sealing ring 3 is actually simulating the adaptive range and state of the clearance between rotor 7 and stator 1 during operation.

[0055] Or, specifically, such as Figure 11 As shown, and with reference Figures 8 to 10 As shown, the connecting assembly includes a custom bolt 12 and a nut. The nut can be a self-locking nut. A portion of the custom bolt 12 passes through the through hole 6 and the mounting groove 2. One end of the custom bolt 12 has a second step 13; the other end of the custom bolt 12 is a threaded end. An axial clearance Δ3 is formed between the inner end of the second step 13 and the end face of the stator 1, or an axial clearance Δ3 is formed between the stator 1 and the sealing ring 3. The nut is installed on the threaded end of the custom bolt 12. The assembly structure of the rotor and stator is adapted to obtain the required axial clearance Δ3 by grinding the inner end face of the second step 13. A threaded stop 14 is provided at the threaded end to limit the nut.

[0056] The rotor and stator assembly structure of this application has been applied to the hot end of an aero-engine and has undergone component comparison measurement tests and thousands of hours of aero-engine whole-engine evaluation tests. The test results prove that the gap between the rotor 7 and stator 1 of this application can be adaptively adjusted, the scheme is feasible, the test results meet the requirements and are in line with expectations.

[0057] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. An assembly structure for a rotor and a stator, characterized in that, include: The stator (1) is annular, and multiple mounting slots (2) are provided at intervals in the inner ring of the stator (1). The sealing ring (3) is annular, the inner ring of the sealing ring (3) is the sealing part (4), and the outer ring of the sealing ring (3) is the base part (5); the base part (5) overlaps with the inner ring of the stator (1); the base part (5) is provided with a through hole (6) that matches the mounting groove (2) on the stator (1). The rotor (7) is provided with a sealing part (4) arranged around the rotor (7) at intervals; the gap between the sealing part (4) and the rotor (7) is Δ2; A connecting assembly, partially penetrating the through hole (6) and the mounting groove (2), assembles the sealing ring (3) onto the stator (1); the connecting assembly is adapted to adjust the connecting length to adjust the axial clearance Δ3 between the stator (1) and the sealing ring (3) along the rotor (7) axis, such that Δ3 is half of Δ2; The connection component includes: The sleeve (8) partially penetrates the through hole (6) and the mounting groove (2), and one end of the sleeve (8) is provided with a first step; the inner end of the first step forms an axial gap Δ3 with the end face of the stator (1), or an axial gap Δ3 is formed between the stator (1) and the sealing ring (3); A rivet (9) penetrates the sleeve (8), with the cap end of the rivet (9) contacting the outer end of the first step; the riveting end of the rivet (9) contacts the other end of the sleeve (8). Washer (10) is fitted onto the sleeve (8), and the washer (10) is located between the riveting end of the rivet (9) and the outer end face of the base part (5) of the sealing ring (3); The assembly structure of the rotor and stator is adapted to obtain the required axial clearance Δ3 by grinding the other end face of the sleeve (8).

2. The rotor and stator assembly structure according to claim 1, wherein The inner end of the washer (10) is connected to the base part (5) of the sealing ring (3) by spot welding; the outer end of the washer (10) is connected to the riveting end of the rivet (9) by spot welding.

3. The rotor and stator assembly of claim 2, wherein Three inclined grooves (11) are evenly distributed on the outer periphery of the washer (10). One inclined groove (11) is suitable for indicating the position of the rivet end of the outer end of the washer (10) and the rivet (9) for spot welding. The other two inclined grooves (11) are suitable for indicating the position of the inner end of the washer (10) and the base part (5) of the sealing ring (3) for spot welding.

4. The rotor and stator assembly according to any one of claims 1 to 3, wherein A gap Δ1 is reserved between the bottom end of the sleeve (8) and the mounting groove (2), and Δ1 is equal to Δ2.

5. The rotor and stator assembly of any one of claims 1-3, wherein, By grinding the outer circumferential surface of the sleeve (8), the gap Δ4 between the sleeve (8) and the through hole (6) on the base part (5) is increased, and the radial movement between the sealing ring (3) and the stator (1) is obtained, wherein Δ4 is ​​not less than 1 / 5 of Δ2; the radial movement is twice Δ2.

6. The rotor and stator assembly of any one of claims 1-3, wherein, The stator (1) is an annular cascade.

7. The rotor and stator assembly of any one of claims 1-3, wherein, The sealing part (4) is a honeycomb part or a wear-resistant coating.

8. The rotor and stator assembly of any one of claims 1-3, wherein, By controlling the width L1 of the mounting groove (2) and the distance L2 between the bottom of the mounting groove (2) and the center of symmetry of the stator (1), a radial margin is reserved between the rotor (7) and the stator (1).

9. The rotor and stator assembly of claim 1, wherein, The connection component includes: A custom bolt (12) partially penetrates the through hole (6) and the mounting groove (2). One end of the custom bolt (12) is provided with a second step (13). The other end of the custom bolt (12) is a threaded end. An axial gap Δ3 is formed between the inner end of the second step (13) and the end face of the stator (1), or an axial gap Δ3 is formed between the stator (1) and the sealing ring (3). Nuts are installed on the threaded end of the custom bolt (12); The assembly structure of the rotor and stator is adapted to obtain the required axial clearance Δ3 by grinding the inner end face of the second step (13).

Images