A compressor inner ring circumferential stop structure and installation method thereof

Abstract

The present invention relates to the field of aero-engine technology, and discloses a circumferential stop structure for an inner ring of a compressor and an installation method thereof. By providing a bottom groove and an oblique groove on the stop block, the plug-in portion of the locking plate is inserted from the bottom groove of the stop block, the end of the plug-in portion is bent into the oblique groove, and the limiting portion is abutted against the circumferential end surface of the stator blade, thereby achieving the installation and circumferential positioning of the inner ring of the compressor. Due to the mutual constraints between the various components of the stop structure, the inner ring of the compressor cannot rotate arbitrarily in the circumferential direction, thereby achieving the stopping effect; and the stop structure is simple, reliable, stable, and has a strong load-bearing capacity, which can improve the reliability of the operation of the inner ring structure of the compressor, avoid the problem of poor shear resistance and wear resistance of the stop pin when the stop pin is used for circumferential stopping of the inner ring of the compressor in the prior art, and avoid the problem of failure of the circumferential anti-rotation structure of the inner ring of the compressor caused by loosening of the stop pin.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engines and discloses a compressor inner ring circumferential stopping structure and an installation method thereof. Background Art

[0002] The inner ring structure of an aircraft engine is a crucial component in sealing the compressor's internal flow path. One side of the ring is mounted on the inner edge of the stator blades, while the other side, through a honeycomb or coating, forms a seal with the rotor grate. To ensure easy assembly and disassembly of the compressor inner ring while ensuring reliable operation, its circumferential position is typically restricted to prevent it from rotating arbitrarily during operation. Therefore, a circumferential anti-rotation design is necessary.

[0003] At present, most of the structural designs of the compressor inner ring circumferential stop are based on Figure 1 The illustrated radial stop pin 5 structure consists of slots cut into the inner edge of the stator blade 4, radial holes drilled in the compressor inner ring 3 at locations corresponding to the slots in the stator inner edge, and stop pins 5 installed in the radial holes. The stop pins 5 restrict circumferential rotation of the compressor inner ring 3 and are secured within the radial holes of the compressor inner ring 3 by welding or point locking. Due to design considerations such as weight, clearance, and performance, the dimensions of the compressor inner ring 3 are generally limited, preventing it from being designed too large. Consequently, the stop pins 5 are typically designed with a diameter of approximately 2 mm and a height of 4 to 6 mm. Due to the small size of the stop pins 5 and their limited resistance to shear and wear, circumferential anti-rotation failure of the sealing ring due to pin wear and breakage is common. Furthermore, welding to lock the stop pins does not completely eliminate welding stress, and cracking of the welds and loosening of the pins are common during use, leading to a range of problems such as rotor-stator rubbing and blade damage. Summary of the Invention

[0004] The purpose of the present invention is to provide a compressor inner ring circumferential stop structure and an installation method thereof, which can improve the reliability of the operation of the compressor inner ring structure, avoid the problem of poor shear resistance and wear resistance of the stop pin when the stop pin is used for circumferential stopping of the compressor inner ring in the existing technology, and avoid the problem of failure of the compressor inner ring circumferential anti-rotation structure caused by loosening of the stop pin.

[0005] In order to achieve the above technical effects, the technical solution adopted by the present invention is:

[0006] A compressor inner ring circumferential stop structure, comprising:

[0007] A stop block is located on the inner ring of the compressor, wherein the outer wall surface of the inner ring of the compressor is provided with a tenon groove that cooperates with the tenon of the stator blade, and the stop block is fixed in the tenon groove; the tenon of the stator blade is close to the stop block and has a clearance fit with the top surface of the stop block;

[0008] A bottom groove, the bottom groove extending from a circumferential end surface of the stop block along the circumference of the compressor inner ring toward the interior of the stop block;

[0009] An inclined groove is provided on the stop block, wherein the bottom surface of the inclined groove is connected to the bottom groove, and the top surface of the inclined groove extends obliquely upward away from the bottom groove;

[0010] The locking plate includes an inserting portion and a limiting portion. The inserting portion is used to be inserted from the bottom groove of the stop block and extend into the inclined groove. The limiting portion of the locking plate is used to abut and cooperate with the circumferential end surface of the stator blade.

[0011] Furthermore, the top surface of the inclined groove extends to penetrate a side of the stop block away from the compressor inner ring.

[0012] Furthermore, the limiting portion of the locking piece is a bent portion provided at the end of the locking piece.

[0013] Furthermore, lugs cooperating with the mortise are provided on both sides of the bottom of the stator blade tenon, and a notch cooperating with the gap of the stop block is provided between the two lugs; the axial end surface of the limiting portion of the locking plate protrudes outward and abuts against the corresponding lug, so that the limiting portion of the locking plate forms a T-shaped structure.

[0014] Furthermore, the deflection angle of the skew groove relative to the radial direction of the compressor inner ring is in the range of The analysis determined that is the deflection angle of the skew groove relative to the radial direction of the compressor inner ring, is the correction factor, The value range is 1.3~2.0, is the bending length of the plug-in portion, is the preset plugging force when the locking piece is plugged in, and the plugging force is directed from the limiting portion to the plugging portion, is the yield strength of the cleat material, is the width of the plug-in part, is the thickness of the plug-in part.

[0015] Furthermore, the design width of the locking piece plug-in portion is based on ,in is the maximum force that the plug-in portion can withstand after bending, and the maximum force is directed from the plug-in portion to the limiting portion, is the height of the bottom trough.

[0016] To achieve the above technical effects, the present invention further provides a method for installing a compressor inner ring circumferential stop structure, which is used to obtain the compressor inner ring circumferential stop structure, comprising:

[0017] Fix the stop block at the circumferential notch of the compressor inner ring tenon groove, wherein the circumferential notch is a structure where the stator blade tenon is inserted into the tenon groove;

[0018] After all the tenons of the stator blades of the compressor inner ring mounting section are inserted into the tenon grooves, the plug-in portion of the locking plate is inserted from the bottom groove of the stop block, so that the end of the plug-in portion is bent into the inclined groove, and the limiting portion is in abutment with the circumferential end surface of the stator blade.

[0019] Furthermore, after the locking piece is forcibly inserted into the bottom groove to bend the plug-in portion to the inclined groove, the limiting portion of the locking piece located outside the bottom groove is bent to form a bent portion that abuts against the circumferential end surface of the stator blade.

[0020] Furthermore, the stop block is fixed to the compressor inner ring by welding.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention provides a bottom groove and an oblique groove on a stop block fixed to the compressor inner ring. After all the tenons of the stator blades of the compressor inner ring mounting section are inserted into the tenons, the plug-in portion of the locking plate is inserted from the bottom groove of the stop block, so that the end of the plug-in portion is bent into the oblique groove, and the limiting portion abuts and cooperates with the circumferential end surface of the stator blade. By utilizing the mutual constraints between the various components of the stop structure, it is ensured that the compressor inner ring cannot rotate arbitrarily in the circumferential direction, thereby achieving the stopping effect.

[0023] 2. The stopping structure of the present invention is simple and easy to install, and is reliable, stable, and has strong load-bearing capacity. It can improve the reliability of the working of the compressor inner ring structure, avoids the problem of poor shear resistance and wear resistance of the stop pin when the stop pin is used for circumferential stopping of the compressor inner ring in the existing technology, and avoids the problem of failure of the circumferential anti-rotation structure of the compressor inner ring due to loosening of the stop pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the prior art using a stop pin as a circumferential stop structure for the inner ring of a compressor;

[0025] Figure 2 Schematic diagram of the compressor inner ring circumferential stop structure in the embodiment;

[0026] Figure 3 Schematic diagram of the cross-sectional structure of the circumferential stop structure of the inner ring of the compressor in the embodiment;

[0027] Figure 4 Schematic diagram of the structure of the stator blade in the embodiment;

[0028] Figure 5 Schematic diagram of the structure of the stop block in the embodiment;

[0029] Figure 6 Schematic diagram of the structure of the locking piece in the embodiment;

[0030] Figure 7 Schematic diagram of the working state of the locking piece in the embodiment;

[0031] Among them, 1. stop block; 101. bottom groove; 102. oblique groove; 2. locking plate; 201. plug-in part; 202. limiting part; 3. compressor inner ring; 301. mortise and tenon; 4. stator blade; 401. tenon; 402. lug; 403. notch groove; 5. stop pin. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the present invention to the following embodiments, as all technologies implemented based on the present invention fall within the scope of the present invention.

[0033] Example

[0034] See also Figure 2-Figure 7 , a compressor inner ring circumferential stop structure, comprising:

[0035] A stop block 1 is located on the compressor inner ring 3. The outer wall of the compressor inner ring 3 is provided with a tenon 301 that cooperates with the tenon 401 of the stator blade 4, and the stop block 1 is fixed in the tenon 301. The tenon 401 of the stator blade 4 is close to the stop block 1 and has a clearance fit with the top surface of the stop block 1.

[0036] A bottom groove 101, wherein the bottom groove 101 extends from a circumferential end surface of the stop block 1 along the circumference of the compressor inner ring 3 toward the interior of the stop block 1;

[0037] An inclined groove 102 is provided on the stop block 1 , wherein the bottom surface of the inclined groove 102 is connected to the bottom groove 101 , and the top surface of the inclined groove 102 extends obliquely upward away from the bottom groove 101 ;

[0038] The locking piece 2 includes an inserting portion 201 and a limiting portion 202 . The inserting portion 201 is used to be inserted from the bottom groove 101 of the stop block 1 and extend into the inclined groove 102 . The limiting portion 202 of the locking piece 2 is used to abut and cooperate with the circumferential end surface of the stator blade 4 .

[0039] In this embodiment, a bottom groove 101 and an oblique groove 102 are provided on the stop block 1 fixed to the compressor inner ring 3. After all the tenons 401 of the stator blades 4 of the installation section of the compressor inner ring 3 are inserted into the tenon groove 301, the plug-in portion 201 of the locking plate 2 is inserted from the bottom groove 101 of the stop block 1, so that the end of the plug-in portion 201 is bent into the oblique groove 102, and the limiting portion 202 is in abutment with the circumferential end surface of the stator blade 4, thereby realizing the installation and circumferential positioning of the compressor inner ring 3. During the operation of the engine, due to the mutual constraints between the components of the stopping structure, the compressor inner ring 3 cannot rotate circumferentially at will, thereby achieving the stopping effect; the stopping structure of this embodiment is simple, reliable and stable, and has strong load-bearing capacity, which can improve the reliability of the structural operation of the compressor inner ring 3, and avoids the problem of poor shear resistance and wear resistance of the stop pin 5 when the stop pin 5 is used for circumferential stopping of the compressor inner ring 3 in the prior art, and avoids the problem of failure of the circumferential anti-rotation structure of the compressor inner ring 3 caused by loosening of the stop pin 5.

[0040] The height of the stop block 1 in this embodiment is generally sufficient to allow the locking plate 2 to be installed, and should not be designed too high to avoid interference with the inner edge plate of the stator blade 4, thereby avoiding the problem of the stop block 1 affecting the installation of the tenon 401 on the tenon groove 301.

[0041] In this embodiment, the top surface of the inclined groove 102 extends to the side of the stop block 1 away from the compressor inner ring 3, which makes it easy to assist in pulling out the locking plate 2 from the inclined groove 102 from the top surface of the inclined groove 102 when disassembling the stator blade 4 and the compressor inner ring 3 structure, and is not likely to cause damage to the stator structure or the compressor inner ring 3 structure. When reassembling the stator blade 4, it is only necessary to replace the new locking plate 2 and squeeze it into the bottom groove 101 and the inclined groove 102.

[0042] In this embodiment, in order to ensure that the plug-in portion of the locking piece enters the inclined groove and bends under the action of the preset plug-in force, the angle design of the inclined groove should meet the requirements of ,in is the radial deflection angle of the skew groove 102 relative to the compressor inner ring 3, is the correction factor, The value range is 1.3~2.0, is the bending length of the plug-in portion 201, is the preset plugging force when the locking piece 2 is plugged in, and the plugging force is directed from the limiting portion 202 to the plugging portion 201. is the yield strength of the material of the lock plate 2, is the width of the plug-in portion 201, The thickness of the plug-in portion 201 ensures that the locking piece 2 is stably inserted into the inclined groove 102 and forms a bent and locked position, and it is not easy to cause the locking piece 2 to fall out during use.

[0043] In this embodiment, the width of the plug portion 201 is ,in is the maximum force that the plug-in portion 201 can withstand after bending, and the maximum force is directed from the plug-in portion 201 to the limiting portion 202. The height of the bottom groove 101 ensures that the locking piece 2 is not easily broken in the working state after being inserted.

[0044] Based on the same inventive concept, this embodiment also provides a method for installing a compressor inner ring circumferential stop structure, for obtaining the aforementioned compressor inner ring 3 circumferential stop structure, comprising:

[0045] Fix the stopper 1 at the circumferential notch of the mortise 301 of the compressor inner ring 3. The circumferential notch is a structure where the tenon 401 of the stator blade 4 is inserted into the mortise 301.

[0046] After all the tenons 401 of the stator blades 4 of the mounting section of the compressor inner ring 3 are inserted into the tenon grooves 301, the plug-in portion 201 of the locking plate 2 is inserted from the bottom groove 101 of the stop block 1, so that the end of the plug-in portion 201 is bent into the inclined groove 102, and the limiting portion 202 is in abutment with the circumferential end surface of the stator blade 4.

[0047] The circumferential retaining structure of the compressor inner ring 3 in this embodiment is simple and easy to install. The locking plate 2 is inserted through the bottom groove 101 of the stop block 1, and the end of the plug-in portion 201 is cleverly bent within the inclined groove 102, providing a self-locking stop. The retaining portion 202 of the locking plate 2 tightly abuts the circumferential end surface of the stator blades 4, achieving circumferential positioning of the compressor inner ring 3 and significantly enhancing the structural stability and reliability. The entire installation process requires only simple operations, eliminating the need for complex tools and equipment, greatly improving installation efficiency and convenience.

[0048] In this embodiment, after the locking plate 2 is forcibly inserted into the bottom groove 101 and the insertion portion 201 is bent into the inclined groove 102, the limiting portion 202 of the locking plate 2 located outside the bottom groove 101 is bent to form a bent portion that abuts the circumferential end surface of the stator blade 4. For example, in some embodiments, the bottom of the tenon 401 of the stator blade 4 is provided with lugs 402 on both sides that mate with the tenon groove 301. Between the two lugs 402 is a notch 403 that gap-fits with the stop block 1. The axial end surfaces of the limiting portion 202 of the locking plate 2 protrude outward and abut against the corresponding lugs 402, forming a T-shaped structure. The locking plate 2 has a simple structure and is easy to manufacture. When securing, only the exposed portion needs to be bent to achieve close abutment with the circumferential end surface of the stator blade 4, ensuring the long-term stable operation of the circumferential stop structure of the compressor inner ring 3.

[0049] The stop block 1 and the stator blade 4 can be integrally formed or fixed in other structures. For example, in this embodiment, the stop block 1 and the compressor inner ring 3 are fixed in relative position by welding.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A compressor inner ring circumferential stop structure, characterized in that: include: A stop block (1), the stop block (1) being located on the compressor inner ring (3), the outer wall surface of the compressor inner ring (3) being provided with a tenon groove (301) that cooperates with the tenon (401) of the stator blade (4), and the stop block (1) being fixed in the tenon groove (301); the tenon (401) of the stator blade (4) being in clearance cooperation with the top surface of the stop block (1) at a position close to the stop block (1); A bottom groove (101), the bottom groove (101) extending from a circumferential end surface of the stop block (1) along the circumference of the compressor inner ring (3) toward the interior of the stop block (1); An inclined groove (102), the inclined groove (102) is provided on the stop block (1), the bottom surface of the inclined groove (102) is connected to the bottom groove (101), and the top surface of the inclined groove (102) extends obliquely upward away from the bottom groove (101); A locking plate (2), comprising an inserting portion (201) and a limiting portion (202), wherein the inserting portion (201) is used to be inserted from the bottom groove (101) of the stop block (1) and extend into the inclined groove (102), and the limiting portion (202) of the locking plate (2) is used to abut and cooperate with the circumferential end surface of the stator blade (4).

2. The compressor inner ring circumferential stop structure according to claim 1, characterized in that: The top surface of the inclined groove (102) extends to penetrate the side of the stop block (1) away from the compressor inner ring (3).

3. The compressor inner ring circumferential stop structure according to claim 2, characterized in that: The limiting portion (202) of the locking piece (2) is a bent portion provided at the end of the locking piece (2).

4. The compressor inner ring circumferential stop structure according to claim 1, characterized in that: Lugs (402) that cooperate with the tenon (301) are provided on both sides of the bottom of the tenon (401) of the stator blade (4), and a notch (403) that is clearance-matched with the stop block (1) is provided between the two lugs (402); the axial end surface of the limiting portion (202) of the locking plate (2) protrudes outward and abuts against the corresponding lug (402), so that the limiting portion (202) of the locking plate (2) forms a T-shaped structure.

5. The compressor inner ring circumferential stop structure according to claim 1, characterized in that: The deflection angle of the inclined groove (102) relative to the radial direction of the compressor inner ring (3) is in the range of The analysis determined that is the deflection angle of the chute (102) relative to the radial direction of the compressor inner ring (3), is the correction factor, The value range is 1.3~2.0, is the bending length of the plug-in portion (201), is a preset plugging force when the locking piece (2) is plugged in, the plugging force being directed from the limiting portion (202) to the plugging portion (201), is the yield strength of the material of the locking piece (2), is the width of the plug-in portion (201), is the thickness of the plug-in portion (201).

6. The compressor inner ring circumferential stop structure according to claim 5, characterized in that: The width of the plug-in portion (201) is determined according to ,in is the maximum force that the plug-in portion (201) can withstand after being bent, and the maximum force is directed from the plug-in portion (201) to the limiting portion (202), is the height of the bottom trough (101).

7. A method for installing a circumferential stop structure of a compressor inner ring, for obtaining the circumferential stop structure of a compressor inner ring (3) according to any one of claims 1 to 6, characterized in that: include: The stopper (1) is fixed at a circumferential notch position of the mortise (301) of the compressor inner ring (3), wherein the circumferential notch is a structure in which the tenon (401) of the stator blade (4) is inserted into the mortise (301); After all tenons (401) of the stator blades (4) of the installation section of the compressor inner ring (3) are inserted into the tenon grooves (301), the plug-in portion (201) of the locking plate (2) is inserted from the bottom groove (101) of the stop block (1), so that the end of the plug-in portion (201) is bent into the inclined groove (102), and the limiting portion (202) is in abutment with the circumferential end surface of the stator blade (4).

8. The method for installing the compressor inner ring circumferential stop structure according to claim 7, characterized in that: After the locking piece (2) is inserted into the bottom groove (101) with force so that the plug-in portion (201) is bent to the inclined groove (102), the limiting portion (202) of the locking piece (2) located outside the bottom groove (101) is bent to form a bent portion that abuts against the circumferential end surface of the stator blade (4).

9. The method for installing the compressor inner ring circumferential stop structure according to claim 7, characterized in that: The stop block (1) is fixed to the compressor inner ring (3) by welding.

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