Compressor outlet tandem cascade structure with sealing ring

Abstract

The invention provides a compressor outlet tandem cascade structure with a sealing ring. The compressor outlet tandem cascade structure comprises an outer ring and an inner ring. The outer ring and the inner ring are connected through a plurality of front-row blades and a plurality of rear-row blades, and the front-row blades and the rear-row blades form a serial blade grid. One side of the inner ring is connected with a sealing ring, and a sealing coating is sprayed on the inner wall of the sealing ring; the inner surface of the outer ring is provided with a plurality of bosses, grooves, welding connection surfaces and pressure relief holes, the outer surface of the inner ring is provided with a plurality of bosses, grooves, welding connection surfaces and pressure relief holes, and the inner surface of the inner ring is provided with a matching surface and a matching groove; the first rear end face of the outer ring makes contact with the rear end faces of the rear-row blades, and the front-row blades and the rear-row blades are limited between the front end face and the second rear end face of the inner ring. Through the matching groove in the inner surface of the inner ring, the functions that after the inner ring is in interference fit with a sealing ring, the sealing ring is accurately positioned and mechanically locked in the axial direction, and the stress of the interference fit surface is uniformly distributed can be achieved.

Description

Technical Field

[0001] The invention relates to a compressor outlet tandem blade cascade structure with a sealing ring, belonging to the field of aero-engine compressor design. Background Art

[0002] In order to reduce the flow loss in the combustion chamber, when designing the compressor, it is usually necessary to ensure that the airflow angle at the compressor outlet is axial, which puts forward requirements for the airflow turning angle of the compressor outlet stage guide vanes. When the required airflow turning angle cannot be achieved with a single row of blades, or even if it can be achieved but the loss is too large, it is necessary to use a tandem blade grid with a very close distance between the front and rear to complete it. Because the axial distance between the tandem blades is very close, they cannot be processed as a whole and can only be processed separately. After separate processing, they need to be processed into one piece again through process means. Therefore, the tandem blade grid structure at the compressor outlet is usually achieved by vacuum brazing. The current brazing structure of the compressor stator blades usually uses tooling to ensure the clearance, pressure relief and brazing filler filling of the blade brazing surface. The brazing quality assurance relies too much on the tooling design, that is, it is guaranteed by the process rather than the design, which leads to increased production costs. When the tooling design is insufficient, the brazing quality cannot be guaranteed.

[0003] To ensure engine performance, the compressor outlet airflow must be sealed, typically using structures such as grate coatings and grate honeycombs. The grate components are integrated with the compressor rotor, while the coating and honeycomb components are integrated with the compressor outlet tandem blade assembly or the combustor diffuser assembly. The coating and honeycomb components are typically welded. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a compressor outlet tandem blade structure with a sealing ring, in which the front and rear rows of blades of the compressor outlet tandem blade structure with a sealing ring are processed separately, and are provided with upper and lower edge plates. The edge plates are formed by vacuum brazing with the inner and outer rings, and are integrated with the sealing ring through interference fit.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a compressor outlet tandem blade structure with a sealing ring, comprising an outer ring, an inner ring, a front row of blades, a rear row of blades and a sealing ring; the outer ring and the inner ring are connected by a plurality of front row blades and a rear row of blades, and the plurality of front row blades and the rear row blades form a tandem blade grid; the inner surface of the inner ring is provided with a mating surface and a mating groove for connecting to the sealing ring, and a sealing coating is sprayed on the inner wall of the sealing ring; the first rear end face of the outer ring contacts the rear end face of the rear row of blades, and the front row blades and the rear row blades are confined between the front end face and the second rear end face of the inner ring; the inner surface of the outer ring is provided with three bosses, and the space between two adjacent bosses is large. There is a groove and a welding connection surface between the outer ring and the rear blade end face, and a pressure relief hole is evenly distributed in the middle of each welding connection surface. A groove is provided near the first rear end face where the outer ring cooperates with the rear blade end face, totaling three grooves, two welding connection surfaces, and two pressure relief holes; the outer surface of the inner ring is provided with three bosses, and a groove and a welding connection surface are provided between two adjacent bosses. A pressure relief hole is evenly distributed in the middle of each welding connection surface, and a groove is provided near the front end face and the second rear end face where the inner ring cooperates with the front and rear blade end faces, totaling four grooves, two welding connection surfaces, and two pressure relief holes.

[0007] The outer ring and the inner ring are both integral ring structures, and both have mounting edges.

[0008] The front row blades and the rear row blades are both single blade structures with inner and outer edge plates, and only the boss of the outer ring contacts the outer edge plates of the front row blades and the rear row blades on the inner surface of the outer ring.

[0009] A plurality of front row blades and rear row blades form a two-row blade structure.

[0010] A groove is provided on the inner wall of the sealing ring. The groove is designed as a stepped structure and matches the stepped grate teeth to ensure the sealing effect of the airflow after the compressor. The sealing coating can be applied in the groove by plasma spraying. The sealing coating can be selected from NiCuAl / BN or Al / BN according to the requirements of the use conditions.

[0011] The sealing ring and the inner ring are in a non-detachable interference fit.

[0012] The outer ring has three bosses, including a first boss, a second boss, and a third boss; the outer ring has three grooves, including a first groove, a second groove, and a third groove; the outer ring has two groups of pressure relief holes, including a first group of pressure relief holes and a second group of pressure relief holes, and the two groups of pressure relief holes can be evenly arranged along the circumferential direction according to 25% to 40% of the number of blades in two rows; the outer ring has at least two welding connection surfaces, including a first welding connection surface and a second welding connection surface, the first groove and the first welding connection surface are between the first boss and the second boss, the second groove and the second welding connection surface are between the second boss and the third boss, and the pressure relief holes are provided on the first welding connection surface and the second welding connection surface; The first boss contacts the front end of the outer edge plate of the front row blades, the second boss contacts the rear end of the outer edge plate of the front row blades and the front end of the outer edge plate of the rear row blades, and the third boss contacts the rear end of the outer edge plate of the rear row blades; The inner ring has three bosses, including boss one, boss two and boss three; the inner ring has at least four grooves, including groove one, groove two, groove three and groove four; the inner ring has at least two groups of pressure relief holes, including a third group of pressure relief holes and a fourth group of pressure relief holes, and the two groups of pressure relief holes can be evenly arranged along the circumferential direction according to 25% to 40% of the number of blades in the two rows; the inner ring has at least two welding connection surfaces, including a third welding connection surface and a fourth welding connection surface, between boss one and boss two are groove two and the third welding connection surface, between boss two and boss three are groove three and the fourth welding connection surface, and the pressure relief holes are arranged on the third welding connection surface and the fourth welding connection surface; the inner surface has at least two mating surfaces, including a first mating surface and a second mating surface, and a first mating groove and a second mating groove are provided on the second mating surface, there are at least four second mating grooves, and there is one first mating groove; The first boss contacts the front end of the inner edge plate of the front row blades, the second boss contacts the rear end of the inner edge plate of the front row blades and the front end of the inner edge plate of the rear row blades, and the third boss contacts the rear end of the inner edge plate of the rear row blades; The diameter of the first mating surface is 0.5 mm smaller than the diameter of the second mating surface. The depth of the first mating groove is 0.6 mm, and the depth of the second mating groove is 0.4 mm.

[0013] The grooves of the outer ring and the inner ring are filled with sticky strip solder or viscous solder diluted with acetone, and the welding connection surfaces of the outer ring and the inner ring are filled with thin strip solder of 0.1 mm thickness.

[0014] The total gap between the front row blades, the rear row blades and the front end face and the second rear end face is 0.2mm~0.3mm; the gap between the front row blades and the front end face, the front row blades and the rear row blades, and the rear row blades and the second rear end face does not exceed 0.1m.

[0015] The bosses of the outer ring and the bosses of the inner ring are respectively interference fit with the inner and outer edge plates of the front row blades and the rear row blades in the radial direction, and the total radial interference is 0.373~0.188mm; the welding connection surfaces of the outer ring and the welding connection surfaces of the inner ring are respectively clearance fit with the inner and outer edge plates of the front row blades and the rear row blades, and the clearance does not exceed 0.1mm.

[0016] The beneficial effects of the present invention are: the compressor outlet tandem blades and the compressor outlet sealing ring are integrated as a unit structure, which can simultaneously realize the outlet diversion and sealing functions, and realize reliable connection with the compressor and the combustion chamber through the outer ring mounting edge; through the bosses, grooves and other structures on the inner and outer rings, it is ensured that after assembly, the gap between the brazing surfaces is appropriate and the capillary action is significant, thereby ensuring the brazing quality; through the matching grooves on the inner ring, the sealing ring can be accurately positioned, axially mechanically locked, and the stress distribution on the interference fit surface can be uniform after interference fit with the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of the middle and outer rings; Figure 3 yes Figure 1 Schematic diagram of the structure of the middle inner ring; Figure 4 This is the dimension design drawing of the front and rear rows of blades of the present invention; Figure 5 It is a schematic diagram of welding according to the present invention; Figure 6 It is a schematic diagram of the assembly of the sealing ring and the inner ring of the present invention; In the figure: 1-outer ring, 11-first boss, 12-second boss, 13-third boss, 14-first groove, 15-second groove, 16-third groove, 17-first welding connection surface, 18-second welding connection surface, 19-first rear end face, 91-first group of pressure relief holes, 92-second group of pressure relief holes, 2-front row blades, 3-rear row blades, 4-inner ring, 21-boss one, 22-boss two, 23-boss three, 24-groove one, 25-groove two, 26-groove three, 27-groove four, 28-third welding connection surface, 29-fourth welding connection surface, 30-front end face, 31-second rear end face, 61-first mating surface, 62-first mating groove, 63-second mating surface, 64-second mating groove, 93-third group of pressure relief holes, 94-fourth group of pressure relief holes, 5-sealing ring, 6-sealing coating. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0019] like Figure 1 As shown, the outer ring 1 is a full-ring structure with a mounting edge to ensure reliable connection with the compressor and combustion chamber casing. The front row of blades 2 and the rear row of blades 3 are single-blade structures with inner and outer edge plates. The two rows of blades form a tandem blade grid to achieve the compressor outlet airflow angle requirement and ensure that the outlet airflow angle is axial; the inner ring 4 is a full-ring structure, and the sealing coating 6 is plasma sprayed in the groove of the sealing ring 5. The sealing coating 6 can be selected from NiCuAl / BN or Al / BN according to the requirements of the use conditions. The sealing ring 5 and the inner ring 4 are a non-detachable interference fit.

[0020] The groove of the sealing ring 5 is designed as a stepped structure, which matches the stepped grate teeth to ensure the sealing effect of the airflow after the compressor.

[0021] like Figure 2 As shown, the first boss 11, the second boss 12, and the third boss 13 are three bosses on the inner surface of the outer ring 1, the first groove 14, the second groove 15, and the third groove 16 are three grooves on the inner surface of the outer ring 1, the first welding connection surface 17 and the second welding connection surface 18 are two axially longer welding connection surfaces on the inner surface of the outer ring 1, the first rear end face 19 is the rear end face of the outer ring 1 that cooperates with the rear row of blades 3, and the first group of pressure relief holes 91 and the second group of pressure relief holes 92 are pressure relief holes that are located in the axial middle position of the first welding connection surface 17 and the second welding connection surface 18 and are evenly distributed circumferentially.

[0022] Furthermore, the first boss 11 , the second boss 12 , and the third boss 13 are 0.1±0.03 mm higher than the first welding connection surface 17 and the second welding connection surface 18 , and the first groove 14 , the second groove 15 , and the third groove 16 are 0.5 mm to 1 mm lower than the first welding connection surface 17 and the second welding connection surface 18 .

[0023] Specifically, when the outer ring 1 cooperates with the front row blades 2 and the rear row blades 3, only three bosses on the inner surface of the outer ring 1 contact the outer edge plates of the front row blades 2 and the rear row blades 3, among which the first boss 11 only contacts the front end of the outer edge plate of the front row blades 2, the second boss 12 contacts the rear end of the outer edge plate of the front row blades 2 and the front end of the outer edge plate of the rear row blades 3, and the third boss 13 only contacts the rear end of the outer edge plate of the rear row blades 3.

[0024] Furthermore, the first groove 14, the second groove 15, and the third groove 16 are mainly used to add sticky strip solder or viscous solder diluted with acetone, and the first welding connection surface 17 and the second welding connection surface 18 are mainly used to add thin strip solder, and the thickness of the thin strip solder is 0.1 mm.

[0025] Preferably, when the rear row blades 3 are assembled, their rear end faces should be in contact with the first rear end face 19 of the outer ring 1 .

[0026] Specifically, the first group of pressure relief holes 91 and the second group of pressure relief holes 92 can be evenly arranged along the circumference according to 25% to 40% of the number of blades in the two rows. Their main function is to ensure that during brazing, the air at the first welding connection surface 17 and the second welding connection surface 18 can be discharged through the first group of pressure relief holes 91 and the second group of pressure relief holes 92 to prevent large pores from appearing in the weld. At the same time, it can also ensure that the effective area of ​​the welding connection surface is sufficient, thereby improving the quality of vacuum welding.

[0027] like Figure 3 As shown, boss one 21, boss two 22, and boss three 23 are three bosses on the outer surface of the inner ring 4, groove one 24, groove two 25, groove three 26, and groove four 27 are four grooves on the outer surface of the inner ring 4, the third welding connection surface 28 and the fourth welding connection surface 29 are two axially longer welding connection surfaces on the outer surface of the inner ring 4, the front end face 30 and the second rear end face 31 are the front and rear end faces of the inner ring 4 that cooperate with the front row blades 2 and the rear row blades 3 respectively, and the third group of pressure relief holes 93 and the fourth group of pressure relief holes 94 are pressure relief holes that are axially middle positions of the third welding connection surface 28 and the fourth welding connection surface 29 and are evenly distributed circumferentially.

[0028] Furthermore, boss one 21 , boss two 22 , and boss three 23 are 0.1±0.03 mm higher than the welding connection surfaces 28 and 29 , and groove one 24 , groove two 25 , groove three 26 , and groove four 27 are 0.5 mm to 1 mm lower than the third welding connection surface 28 and the fourth welding connection surface 29 .

[0029] Specifically, when the inner ring 4 cooperates with the front row blades 2 and the rear row blades 3, only three bosses on the outer surface of the inner ring 4 contact the inner edge plates of the front row blades 2 and the rear row blades 3, among which boss one 21 only contacts the front end of the inner edge plate of the front row blades 2, boss two 22 contacts the rear end of the inner edge plate of the front row blades 2 and the front end of the inner edge plate of the rear row blades 3, and boss three 23 only contacts the rear end of the inner edge plate of the rear row blades 3.

[0030] Furthermore, groove one 24, groove two 25, groove three 26, and groove four 27 are mainly used to add sticky strip solder or viscous solder diluted with acetone, and the third welding connection surface 28 and the fourth welding connection surface 29 are mainly used to add thin strip solder, and the thickness of the thin strip solder is 0.1 mm.

[0031] Specifically, the thin strip brazing filler metal fills the entire gap range of the welding connection surface, ensuring that the inner and outer rings 1, the inner ring 4 and the front row blades 2 and the rear row blades 3 of the brazing connection surface are absolutely reliable. The sticky strip brazing filler metal or the viscous brazing filler metal diluted with acetone added to the groove is mainly used for replenishment, ensuring that there is sufficient supply of brazing filler metal at the brazing connection surface, the circumferential gap between adjacent blades, the axial gap between the front row blade 2 and the front end face 30, the front row blade 2 and the rear row blade 3, and the rear row blade 3 and the second rear end face 31. Preferably, the total gap between the front row blades 2, the rear row blades 3 and the front end face 30, the second rear end face 31 is 0.2mm~0.3mm. When the front row blades 2 and the rear row blades 3 are assembled, they are restricted between the front end face 30 and the second rear end face 31, and the gaps between the front row blades 2 and the front end face 30, the front row blades 2 and the rear row blades 3, and the rear row blades 3 and the second rear end face 31 cannot exceed 0.1mm.

[0032] Preferably, the third group of pressure relief holes 93 and the fourth group of pressure relief holes 94 can be evenly arranged along the circumferential direction according to 25% to 40% of the number of blades in the two rows. The main function is to ensure that during brazing, the air at the third welding connection surface 28 and the fourth welding connection surface 29 can be discharged through the third group of pressure relief holes 93 and the fourth group of pressure relief holes 94 to prevent large pores from appearing in the weld. At the same time, it can also ensure that the effective area of ​​the welding connection surface is sufficient, thereby improving the quality of vacuum welding.

[0033] like Figure 4 As shown, A is the outer circumferential length dimension of the outer edge plate of the tandem blade, B is the inner circumferential length dimension of the inner edge plate of the tandem blade, and C is the radial height dimension of the outer and inner edges of the tandem blade. During the machining of tandem blades, the dimensions A, B, and C must be strictly controlled. The A and B dimensions affect the circumferential spacing between adjacent blades. The A and B dimensions allow for a circumferential spacing of no more than 0.1 mm between adjacent blades by grinding the back circumferential end surfaces of the front row blades 2 and the rear row blades 3. The C dimension affects the radial fit between the inner and outer edge plates of the front row blades 2 and the rear row blades 3 and the first, second, and third bosses 11, 12, and 13, as well as bosses 1, 21, 22, and 3.

[0034] like Figure 5 As shown, D represents the fit between the first boss 11, the second boss 12, the third boss 13, the boss 1 21, the boss 2 22, and the boss 3 23, respectively, and the inner and outer edge plates of the front row blades 2 and the rear row blades 3. In the radial direction, they are interference fits, with a total radial interference of 0.373-0.188 mm. This interference fit ensures reliable radial positioning of the front row blades 2 and the rear row blades 3 after assembly. E represents the fit between the first weld connection surface 17, the second weld connection surface 18, the third weld connection surface 28, and the fourth weld connection surface 29, respectively, and the inner and outer edge plates of the front row blades 2 and the rear row blades 3. They are clearance fits, and after the total radial interference is 0.373-0.188 mm, the clearance at E does not exceed 0.1 mm.

[0035] like Figure 6As shown, both the first mating surface 61 and the second mating surface 63 are mating surfaces of the inner ring 4. The first mating surface 61 is the mating surface that the sealing ring 5 passes through during assembly, while the second mating surface 63 is the final mating surface between the sealing ring 5 and the inner ring 4. The fit is an interference fit, and assembly is performed by heating or cooling. The diameter of the first mating surface 61 is 0.5 mm smaller than that of the second mating surface 63, making it difficult for the sealing ring 5 to axially exit through the first mating surface 61 after assembly, thus achieving axial mechanical locking of the sealing ring 5. The first mating groove 62 is a groove cut into the second mating surface 63 with a depth of 0.6 mm. This groove is designed to ensure that it does not interfere with the sharp edge of the sealing ring 5 during assembly. The sharp edge of the sealing ring 5 is also designed to mechanically lock the sealing ring 5 axially. The second mating grooves 64 are four additional, evenly spaced grooves on the second mating surface 63, each 0.4 mm deep. These grooves reduce the contact rigidity of the second mating surface 63 and divide the long contact surface into multiple short segments, dispersing contact stress and ensuring uniform stress distribution. This significantly reduces the stress concentration factor, lowering the peak contact stress by over 20%. Furthermore, the sealing ring 5 and the inner ring 4 must have an axial clearance fit, with a small clearance fit being the given value in the actual design. The segmented long contact surface also limits the axial movement of the sealing ring 5 relative to the inner ring 4 during operation. The second mating surface 63 and the sealing ring 5 have an interference fit. To ensure good centering and reliable fit, the interference surface is designed to be slightly longer. In this embodiment, the interference segment is 8 mm long, and a large interference fit is selected, with an interference diameter of 0.86 mm to 1.089 mm. After designing four evenly distributed second mating grooves on the second mating surface 63, it is possible to prevent the interference surface contact stress from being too large, and appropriately increase the radial deformation of the second mating surface 63, so that the step difference between the sealing ring 5 and the first mating surface 61 is larger, and the axial mechanical locking effect of the sealing ring 5 is more prominent.

[0036] During processing, first add sticky solder strips or viscous solder diluted with acetone to the first groove 14, the second groove 15, the third groove 16, the groove one 24, the groove two 25, the groove three 26, and the groove four 27, and add 0.1mm thick thin solder strips to the first welding connection surface 17, the second welding connection surface 18, the third welding connection surface 28, and the fourth welding connection surface 29; then assemble the front blades 2, the rear blades 3 and the inner ring 4. When assembling, pay attention to the front blades 2, the rear blades 3 and the front end surface 30, The axial clearance between the second rear end faces 31 should not exceed 0.1mm. At the same time, attention should be paid to the circumferential spacing between adjacent blades, which should also not exceed 0.1mm. Grinding of the front end face 30 and the second rear end face 31 on the back side of the blade is allowed. The blades are then spot welded to the inner ring 4 while being assembled. After all blades are assembled and spot welded to the inner ring 4, the outer ring 1, to which the brazing filler metal has been added, is heated. After heating, the outer ring 1 is assembled with the front row blades 2, the rear row blades 3, and the inner ring 4. The rear end face of the rear row blades 3 is assembled until it contacts the first rear end face 19. After the front row blades 2, the rear row blades 3, the inner ring 4, and the outer ring 1 are assembled, the assembled components are placed in a brazing furnace for brazing. In this embodiment, the material of the front row blades 2, the rear row blades 3, the inner ring 4, and the outer ring 1 is GH4648, the brazing filler metal is B-Cu35NiMnCoFeSiB, PS, and the brazing temperature is 1065°C. After the temperature reaches the brazing temperature, the sticky strip solder, viscous solder, and thin strip solder all melt. Under the action of capillaries, the solder flows to the first welding connection surface 17, the second welding connection surface 18, the third welding connection surface 28, the fourth welding connection surface 29, the circumferential gap between adjacent blades, the axial gap between the front row blades 2 and the front end face 30, the front row blades 2 and the rear row blades 3, and the rear row blades 3 and the second rear end face 31, etc., with a gap of no more than 0.1mm, and finally achieves reliable brazing. After brazing is completed, the cooled welded assembly is heated to approximately 400°C to assemble the sealing ring 5 with a large interference fit. The sealing coating 6 is sprayed into the sealing ring 5 in advance. At this point, the entire assembly is assembled. To achieve higher dimensional accuracy, the dimensions with high precision requirements can be placed after brazing and interference fit in the process design and then processed.

[0037] As mentioned above, strict control of the dimensions A, B, and C can ensure that the radial interference dimensions of the blades along the engine are reasonable during assembly. The outer ring 1 and inner ring 4 of the present invention respectively cooperate with the outer edge plates and inner edge plates of the front row blades 2 and the rear row blades 3. Through the bosses, grooves and other structures designed on the inner surface of the outer ring 1 and the outer surface of the inner ring 4, the bosses are positioned for interference fit. The gap between the welding connection surfaces is appropriate, and sufficient brazing material is added to the grooves to ensure reliable final brazing quality. The inner side of the inner ring 4 is processed to form an interference fit surface that cooperates with the sealing ring 5. The slightly longer interference fit surface is designed to ensure reliable fit. At the same time, in order to prevent excessive assembly stress, four grooves are designed on the interference fit surface on the inner ring 4. At the same time, in order to ensure that the sealing ring 5 cannot be withdrawn, the tip of the sealing ring 5 is designed to cooperate with the end face of the inner ring 4 to achieve axial mechanical locking of the sealing ring 5.

[0038] The beneficial effects of the present invention are: 1. The blades are reliably connected, and the inner ring and the sealing ring are reliably connected by interference fit. Finally, the tandem blades and the sealing ring form a unit assembly. The unit assembly is assembled in the engine to achieve an axial airflow angle at the compressor outlet, reducing the flow loss in the combustion chamber. At the same time, the sealing ring cooperates with the grate teeth on the compressor rotor to seal the compressor outlet airflow and balance the axial force.

[0039] 2. Ensure reliable brazing gap through assembly and pre-set reliable brazing material filling space to ensure reliable brazing quality.

Claims

1. A compressor outlet tandem blade structure with a sealing ring, comprising an outer ring (1), an inner ring (4), a front row of blades (2), a rear row of blades (3) and a sealing ring (5), characterized in that: The outer ring (1) and the inner ring (4) are connected by a plurality of front row blades (2) and a rear row blades (3), and the plurality of front row blades (2) and the rear row blades (3) form a cascade blade; the inner surface of the inner ring (4) is provided with a mating surface and a mating groove for connecting to a sealing ring (5), and a sealing coating (6) is sprayed on the inner wall of the sealing ring (5); the first rear end face (19) of the outer ring (1) contacts the rear end face of the rear row blades (3), and the front row blades (2) and the rear row blades (3) are restricted between the front end face (30) and the second rear end face (31) of the inner ring (4); the inner surface of the outer ring (1) is provided with three bosses, and a groove is provided between each of the two adjacent bosses. The inner ring (4) is provided with three bosses on its outer surface, and a groove and a welding connection surface are provided between each adjacent boss. The inner ring (4) is provided with a pressure relief hole evenly distributed in the circumferential direction at the middle position of each welding connection surface. The outer ring (1) is provided with a groove near the first rear end surface (19) where the outer ring (1) matches the end surface of the rear blade (3), for a total of three grooves, two welding connection surfaces, and two pressure relief holes. The outer surface of the inner ring (4) is provided with three bosses, and a groove and a welding connection surface are provided between each adjacent boss. The inner ring (4) is provided with a pressure relief hole evenly distributed in the circumferential direction at the middle position of each welding connection surface. The inner ring (4) is provided with a groove near the front end surface (30) and the second rear end surface (31) where the inner ring (4) matches the end surface of the front blade (2) and the rear blade (3), for a total of four grooves, two welding connection surfaces, and two pressure relief holes.

2. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: The outer ring (1) and the inner ring (4) are both integral ring structures, and both have mounting edges.

3. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: The front row blades (2) and the rear row blades (3) are both single-blade structures with inner and outer edge plates, and only the boss of the outer ring (1) contacts the outer edge plates of the front row blades (2) and the rear row blades (3) on the inner surface of the outer ring (1).

4. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: A plurality of front-row blades (2) and rear-row blades (3) form a two-row blade structure.

5. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: The inner wall of the sealing ring (5) is provided with a groove, which is designed as a stepped structure to match the stepped comb teeth. The sealing coating (6) is plasma sprayed in the groove. The sealing coating (6) is selected from NiCuAl / BN or Al / BN according to the requirements of the use conditions.

6. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: The sealing ring (5) and the inner ring (4) are in a non-detachable interference fit.

7. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: The outer ring (1) has three bosses, including a first boss (11), a second boss (12) and a third boss (13); the outer ring (1) has three grooves, including a first groove (14), a second groove (15) and a third groove (16); the outer ring (1) has two groups of pressure relief holes, including a first group of pressure relief holes (91) and a second group of pressure relief holes (92), and the two groups of pressure relief holes can be evenly arranged along the circumferential direction according to 25% to 40% of the number of blades in two rows; the outer ring (1) has two welding connection surfaces, including a first welding connection surface (17) and a second welding connection surface (18); the first groove (14) and the first welding connection surface (17) are between the first boss (11) and the second boss (12), and the second groove (15) and the second welding connection surface (18) are between the second boss (12) and the third boss (13); the pressure relief holes are provided on the first welding connection surface (17) and the second welding connection surface (18); The first boss (11) contacts the front end of the outer edge plate of the front row blades (2), the second boss (12) contacts the rear end of the outer edge plate of the front row blades (2) and the front end of the outer edge plate of the rear row blades (3), and the third boss (13) contacts the rear end of the outer edge plate of the rear row blades (3); The inner ring (4) has three bosses, including boss one (21), boss two (22) and boss three (23); the inner ring (4) has four grooves, including groove one (24), groove two (25), groove three (26) and groove four (27); the inner ring (4) has two groups of pressure relief holes, including a third group of pressure relief holes (93) and a fourth group of pressure relief holes (94), and the two groups of pressure relief holes can be evenly arranged along the circumferential direction according to 25% to 40% of the number of blades in two rows; the inner ring (4) has two welding connection surfaces, including a third welding connection surface (28) and a fourth welding connection surface (29), boss one Between the boss 2 (21) and the boss 2 (22) are the groove 2 (25) and the third welding connection surface (28), between the boss 2 (22) and the boss 3 (23) are the groove 3 (26) and the fourth welding connection surface (29), and the pressure relief hole is provided on the third welding connection surface (28) and the fourth welding connection surface (29); the inner surface has two mating surfaces, including a first mating surface (61) and a second mating surface (63), and a first mating groove (62) and a second mating groove (64) are provided on the second mating surface (63), the second mating grooves (64) have at least four, and the first mating groove (62) has one; The boss 1 (21) contacts the front end of the inner edge plate of the front row blade (2), the boss 2 (22) contacts the rear end of the inner edge plate of the front row blade (2) and the front end of the inner edge plate of the rear row blade (3), and the boss 3 (23) contacts the rear end of the inner edge plate of the rear row blade (3); The diameter of the first mating surface (61) is 0.5 mm smaller than the diameter of the second mating surface (63), the depth of the first mating groove (62) is 0.6 mm, and the depth of the second mating groove (64) is 0.4 mm.

8. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: A viscous strip solder or a viscous solder diluted with acetone is added to the grooves of the outer ring (1) and the inner ring (4), and a 0.1 mm thick thin strip solder is added to the welding connection surfaces of the outer ring (1) and the inner ring (4).

9. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: The total gap between the front row blades (2), the rear row blades (3) and the front end face (30), and the second rear end face (31) is 0.2 mm to 0.3 mm; the gaps between the front row blades (2) and the front end face (30), the front row blades (2) and the rear row blades (3), and the rear row blades (3) and the second rear end face (31) are all no more than 0.1 m.

10. The compressor outlet tandem blade structure with a sealing ring according to claim 1, characterized in that: The boss of the outer ring (1) and the boss of the inner ring (4) are respectively in radial interference fit with the inner and outer edge plates of the front row blades (2) and the rear row blades (3), and the total radial interference is 0.373~0.188mm; the welding connection surface of the outer ring (1) and the welding connection surface of the inner ring (4) are respectively in clearance fit with the inner and outer edge plates of the front row blades (2) and the rear row blades (3), and the clearance does not exceed 0.1mm.

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