Stator assembly and compressor

Abstract

A stator assembly and a compressor are used to improve the situation that stator blades are difficult to be disassembled from a rear stage casing. The stator assembly comprises stator blades, a front stage casing and a rear stage casing. The stator blades are provided with mounting seats on the outer circumferential side. The mounting seats are provided with front flanges on the front end face. The mounting seats are provided with rear flanges protruding in the axial direction on the rear end face. The front stage casing is located on the front side of the stator blades and is provided with a front ring groove on the rear end face. The front ring groove is inserted into the front flange to fix the stator blades and the front stage casing. The rear stage casing is located on the rear side of the stator blades and is provided with a rear ring groove recessed in the axial direction on the front end face. The rear ring groove is inserted into the rear flange to fix the stator blades and the rear stage casing. The front flange is provided with a first matching part. The front ring groove is provided with a second matching part. When the front ring groove is inserted into the front flange, the second matching part cooperates with the first matching part to limit the front flange from being pulled out of the front ring groove in the axial direction.

Description

Technical Field

[0001] This invention relates to the field of aero-engines, and more specifically to a stator assembly and a compressor. Background Technology

[0002] like Figure 1 As shown, during compressor assembly, the rotor is assembled first, with multiple rotor stages assembled into a single unit. Then, the inlet casing, stator blades, and outlet casing are installed stage by stage. During compressor disassembly, the outlet casing is disassembled first, followed by the stator blades, and then the inlet casing. Because the stator blades and outlet casing undergo slight deformation after the aero-engine has been running, the outlet casing is difficult to separate from the stator blades during disassembly. The disassembly force causes the stator blades to separate from the inlet casing, and the stator blades move axially rearward after the outlet casing until they impact the rotor, resulting in damage to both the rotor and stator blades. Summary of the Invention

[0003] The purpose of this invention is to provide a stator assembly and compressor to improve the inconvenience of disassembling the stator blades and the subsequent stage casing.

[0004] In a first aspect, the present invention provides a stator assembly. According to an embodiment of the present invention, the stator assembly includes a stator blade, a pre-stage casing, and a post-stage casing. The stator blade has a mounting base on its outer peripheral side. The mounting base has a front flange on its front end face and a rear flange extending axially on its rear end face. The pre-stage casing is located on the front side of the stator blade and has a front annular groove on its rear end face. The front annular groove is inserted into the front flange to fix the stator blade and the pre-stage casing. The post-stage casing is located on the rear side of the stator blade and has a rear annular groove recessed axially on its front end face. The rear annular groove is inserted into the rear flange to fix the stator blade and the post-stage casing. The front flange has a first mating portion, and the front annular groove has a second mating portion. When the front flange is inserted into the front annular groove, the second mating portion cooperates with the first mating portion to restrict the front flange from axially disengaging from the front annular groove.

[0005] In one or more embodiments, the first mating portion includes a first wedge-shaped protrusion, and the second mating portion includes a second wedge-shaped protrusion, the second wedge-shaped protrusion blocking the passage for the first wedge-shaped protrusion to disengage axially.

[0006] In one or more embodiments, the first wedge-shaped protrusion is located on the inner circumferential side of the front flange, and the second wedge-shaped protrusion is located on the inner circumferential side of the front ring groove.

[0007] In one or more embodiments, the first wedge-shaped protrusion is located on the outer peripheral side of the front flange, and the second wedge-shaped protrusion is located on the outer peripheral side of the front ring groove.

[0008] In one or more embodiments, the front ring groove is provided with an entry in the circumferential direction, and the front flange is inserted into the front ring groove in the circumferential direction through the entry.

[0009] In one or more embodiments, the front stage casing is an integral ring casing, and the front ring groove is provided with a circumferential gap, the central angle of the circumferential gap being greater than the central angle of the front flange of one of the stator vanes, and the front flange is inserted into the front ring groove in the circumferential direction through the circumferential gap.

[0010] In one or more embodiments, the circumferential gap is provided with the front flanges of two of the stator vanes, the front flange of one of the stator vanes is inserted into the front ring groove on the counterclockwise side and located on the clockwise side of the circumferential gap, and the front flange of the other of the stator vanes is inserted into the front ring groove on the clockwise side and located on the counterclockwise side of the circumferential gap.

[0011] In one or more embodiments, the rear flange is provided with a third matching part, the rear ring groove is provided with a fourth matching part, and the third matching part cooperates with the fourth matching part to limit the circumferential rotation of the rear flange in the rear ring groove when the rear flange is inserted into the rear ring groove.

[0012] In one or more embodiments, the fourth matching part includes a pin protruding in the axial direction from the axial end surface of the rear ring groove, and the third matching part includes an anti-rotation groove recessed in the axial direction from the rear end surface of the rear flange, and the pin is inserted into the anti-rotation groove.

[0013] In a second aspect, the present application provides a compressor, according to an embodiment of the present application, the compressor includes the stator assembly described above.

[0014] Embodiments of the present application have at least the following beneficial effects:

[0015] The axial extension of the rear flange and the rear ring groove limits the movement direction of the rear ring groove out of the rear flange to be in the axial direction. In the process of disassembling the stator assembly, when the rear stage casing is applied with a disassembling force to the axial rear side to pull the rear ring groove out of the rear flange in the axial direction, the second matching part blocks the first matching part from being pulled out in the axial direction, preventing the front flange from being pulled out of the front ring groove in the axial direction, and the stator vanes are not separated from the rear stage casing by moving to the axial rear side, but are fixed to the front stage casing. The disassembling force is thus applied to pull the rear ring groove out of the rear flange, and the rear stage casing and the stator vanes are successfully disassembled. BRIEF DESCRIPTION OF DRAWINGS

[0016] The above and other features, properties, and advantages of the present application will become more apparent by describing in detail the following embodiments with reference to the attached drawings, in which:

[0017] Figure 1 is a sectional view of a prior art stator assembly and compressor rotor;

[0018] Figure 2 A sectional view of the stator assembly of the present application;

[0019] Figure 3 A sectional view of the stator assembly of the present application;

[0020] Figure 4 A sectional view of the stator assembly of the present application;

[0021] Figure 5 A schematic view of the front flange of the stator assembly of the present application being inserted into the front ring groove in the circumferential direction;

[0022] Figure 6 A schematic view of the front flanges of the plurality of stator blades of the stator assembly of the present application being distributed in the circumferential direction of the front ring groove;

[0023] Figure 7 A partial schematic view of the rear ring groove of the stator assembly of the present application;

[0024] Figure 8 An oblique view of the stator blade of the stator assembly of the present application;

[0025] Reference numerals:

[0026] 1 - front stage casing

[0027] 2 - stator blade

[0028] 3 - rear stage casing

[0029] 4 - rotor

[0030] 5 - front flange

[0031] 6 - front ring groove

[0032] 7 - rear flange

[0033] 8 - rear ring groove

[0034] 9 - mounting seat

[0035] 10 - first fitting part

[0036] 11 - second fitting part

[0037] 12 - first wedge-shaped convex ring

[0038] 13 - second wedge-shaped convex ring

[0039] 14 - inlet

[0040] 15 - circumferential notch

[0041] 16 - third fitting part

[0042] 17-Pin hole;

[0043] 18-Anti-rotation groove;

[0044] 19-Side wall surface. Detailed Implementation

[0045] Reference will now be made in detail to embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the invention and not to limit it. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the invention without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the invention is intended to cover these modifications and variations that fall within the scope of the appended claims and their equivalents.

[0046] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0047] The terms “first”, “second”, etc., are used interchangeably to distinguish one feature from another and are not intended to indicate that each feature must be located in the position shown in the figure in each embodiment.

[0048] Both the compressor stator and the compressor rotor are rotating bodies. Figure 1 A cross-sectional structure of the central axis of a supercompressor in the prior art is shown. For example... Figure 1 As shown, in the compressor, the stator blades 2 are fixed to the front stage casing 1 by a front flange 5 and a front annular groove 6 inserted axially, and the stator blades 2 are fixed to the rear stage casing 3 by a rear flange 7 and a rear annular groove 8 inserted axially. The stator blades 2 have mounting seats 9 on their outer periphery, and the front flange 5 and rear flange 7 are mounted on the mounting seats 9. During compressor assembly, the rotors 4 are assembled first, and the multi-stage rotors 4 are assembled into a single unit. Then, the front stage casing 1, stator blades 2, and rear stage casing 3 are installed axially stage by stage. During compressor disassembly, the rear stage casing 3 is disassembled axially first, then the stator blades 2 are disassembled axially, and finally the front stage casing 1 is disassembled. Because the stator blade 2 and the subsequent stage casing 3 undergo slight deformation after the aero-engine has been running, the rear flange 7 and rear annular groove 8 are difficult to separate during the axial disassembly of the subsequent stage casing 3. This makes it difficult for the subsequent stage casing 3 to separate from the stator blade 2. The disassembly force causes the front flange 5 and front annular groove 6 to separate axially, separating the stator blade 2 from the preceding stage casing 1. The stator blade 2 then moves axially rearward from the subsequent stage casing 3 until it impacts the rotor 4, causing damage to both the rotor 4 and the stator blade 2. Furthermore, because the stator blade 2 is enclosed by the subsequent stage casing 3, the rear flange 7 is inaccessible, making it impossible to apply force to the rear flange 7, thus preventing the disassembly of the stator blade 2 from the subsequent stage casing 3.

[0049] Figures 2 to 8 The stator assembly of the present invention is shown, wherein some structures are omitted from the display. Figures 2 to 4 As shown, the stator assembly includes stator blades 2, a front-stage casing 1, and a rear-stage casing 3. "Front" refers to the direction of airflow into the compressor, and "rear" refers to the direction of airflow out of the compressor; the same applies below. A mounting base 9 is provided on the outer periphery of the stator blades 2. A front flange 5 is provided on the front end face of the mounting base 9, protruding from the front end face of the mounting base 9. The front flange 5 can be a circumferentially extending annular wall. "Circumferential" refers to the direction of rotation of the compressor stator rotating body; the same applies below. A rear flange 7 is provided on the rear end face of the mounting base 9, protruding axially from the rear end face of the mounting base 9. "Axial" refers to the direction parallel to the central axis of the compressor; the same applies below. The rear flange 7 can be a circumferentially extending annular wall.

[0050] like Figures 2 to 4 As shown, the pre-stage casing 1 is located in front of the stator blade 2. The pre-stage casing 1 has a front annular groove 6 on its rear end face. The front annular groove 6 is recessed from the rear end face of the pre-stage casing 1 and extends circumferentially. The front flange 5 is inserted into the front annular groove 6, thereby fixing the stator blade 2 to the pre-stage casing 1.

[0051] like Figures 2 to 4 As shown, the post-stage casing 3 is located behind the stator blade 2. The post-stage casing 3 has a rear annular groove 8 on its front end face. The rear annular groove 8 is recessed axially from the front end face of the post-stage casing 3 and extends circumferentially. The rear flange 7 is inserted into the rear annular groove 8, thereby fixing the stator blade 2 to the post-stage casing 3.

[0052] like Figures 2 to 4 As shown, the front flange 5 is provided with a first mating part 10, and the front annular groove 6 is provided with a second mating part 11. When the front flange 5 is inserted into the front annular groove 6, the second mating part 11 and the first mating part 10 cooperate to restrict the front flange 5 from axially disengaging from the front annular groove 6. The second mating part 11 can be a stop, and the first mating part 10 can be a blocked part. The second mating part 11 blocks the passage for the first mating part 10 to disengage axially, thereby preventing the front flange 5 from axially disengaging from the front annular groove 6.

[0053] The rear flange 7 and the rear annular groove 8 extend axially to restrict the movement direction of the rear annular groove 8 from the rear flange 7 to be axial. During the disassembly of the stator assembly, when the rear stage housing 3 is subjected to a disassembly force toward the rear axial side to pull the rear annular groove 8 out of the rear flange 7 axially, the second mating part 11 blocks the first mating part 10 from disengaging axially, preventing the front flange 5 from disengaging axially from the front annular groove 6. The stator blade 2 does not move axially toward the rear side of the rear stage housing 3 to separate from the front stage housing 1, but is fixed to the front stage housing 1. The disassembly force then acts to pull the rear annular groove 8 out of the rear flange 7, and the rear stage housing 3 and the stator blade 2 are successfully disassembled.

[0054] like Figures 2 to 4As shown, the first mating portion 10 can be a first wedge-shaped protrusion 12 having a sloped wall surface facing the rear side. The second mating portion 11 can be a second wedge-shaped protrusion 13 having a sloped wall surface facing the front side. The sloped wall surface of the second wedge-shaped protrusion 13 blocks the passage of the sloped wall surface of the first wedge-shaped protrusion 12 moving rearward, and the second wedge-shaped protrusion 13 blocks the passage of the first wedge-shaped protrusion 12 being axially removed, thereby preventing the front flange 5 from being axially removed from the front ring groove 6.

[0055] Figure 2 A stator assembly is shown, as Figure 2 As shown, the first wedge-shaped protrusion 12 can be located on the outer peripheral side of the front flange 5, the outer peripheral surface of the front flange 5 is protruded outwardly toward the outer peripheral side from the rear to the front, the radial thickness of the head of the front flange 5 is greater than the radial thickness of the root of the front flange 5, and the inner peripheral surface of the front flange 5 can extend axially. The second wedge-shaped protrusion 13 can be located on the outer peripheral side of the front ring groove 6, the outer peripheral surface of the front ring groove 6 is protruded outwardly toward the outer peripheral side from the front to the rear, the accommodation space of the front ring groove 6 is protruded outwardly toward the outer peripheral side from the rear to the front, the radial height of the bottom of the front ring groove 6 is greater than the radial height of the mouth of the front ring groove 6, and the inner peripheral surface of the front ring groove 6 can extend axially.

[0056] Figure 3 Another stator assembly is shown, as Figure 3 As shown, the first wedge-shaped protrusion 12 can be located on the inner peripheral side of the front flange 5, the inner peripheral surface of the front flange 5 is protruded inwardly toward the inner peripheral side from the rear to the front, the radial thickness of the head of the front flange 5 is greater than the radial thickness of the root of the front flange 5, and the outer peripheral surface of the front flange 5 can extend axially. The second wedge-shaped protrusion 13 can be located on the inner peripheral side of the front ring groove 6, the inner peripheral surface of the front ring groove 6 is protruded outwardly toward the outer peripheral side from the front to the rear, the accommodation space of the front ring groove 6 is protruded outwardly toward the inner peripheral side from the rear to the front, the radial height of the bottom of the front ring groove 6 is greater than the radial height of the mouth of the front ring groove 6, and the outer peripheral surface of the front ring groove 6 can extend axially.

[0057] Figure 4 Another stator assembly is shown, as Figure 3 As shown, the outer peripheral surface of the front flange 5 can be protruded inwardly toward the inner peripheral side from the rear to the front, parallel to the inner peripheral surface of the front flange 5, the radial thickness of the front flange 5 is constant from the root to the head, and the front flange 5 extends obliquely toward the inner peripheral side. The outer peripheral surface of the front ring groove 6 can be protruded inwardly toward the inner peripheral side from the rear to the front, parallel to the inner peripheral surface of the front ring groove 6, the radial height of the front ring groove 6 is constant from the mouth to the bottom, and the front ring groove 6 extends obliquely toward the inner peripheral side.

[0058] The second mating portion 11 cooperates with the first mating portion 10 to limit the front flange 5 from being axially removed from the front ring groove 6, so that when the stator blade 2 is installed to the front stage casing 1, the second mating portion 11 blocks the first mating portion 10, and the front flange 5 cannot be inserted from the mouth to the bottom of the front ring groove 6. As shown, Figure 5 andFigure 6 As shown, the front annular groove 6 may have an inlet 14 in the circumferential direction, located at the circumferential end of the front annular groove 6. The front annular groove 6 may have an inlet 14 at one or both ends in the circumferential direction. The front flange 5 is inserted into the front annular groove 6 circumferentially through the inlet 14, thereby connecting the front annular groove 6 and the front flange 5. During the process of the front flange 5 being inserted into the front annular groove 6 circumferentially through the inlet 14, the front flange 5 slides circumferentially within the front annular groove 6.

[0059] like Figure 5 and Figure 6 As shown, the front-stage casing 1 can be a continuous ring casing, formed by rotating 360° circumferentially, with a continuous structure in the circumferential direction. A circumferential notch 15 can be provided in the front annular groove 6, causing the front annular groove 6 to break in the circumferential direction, forming two inlets 14 on both sides of the circumferential notch 15. The central angle of the circumferential notch 15 can be greater than the central angle of the leading flange 5 of a stator blade 2, making the circumferential length of the circumferential notch 15 greater than the circumferential length of the leading flange 5 of a stator blade 2, allowing the leading flange 5 of a stator blade 2 to enter. Figure 5 The arrow in the diagram exemplarily illustrates the direction in which the leading flange 5 of a stator blade 2 inserts into the leading annular groove 6. (See image below.) Figure 5 As shown, the front flange 5 of a stator blade 2 can first enter the circumferential notch 15, then enter the inlet 14 and be inserted into the front annular groove 6 along the circumferential direction.

[0060] Figure 6 The diagram shows the circumferential distribution of the front flange 5 of multiple stator blades 2 interfacing with the front annular groove 6, as follows: Figure 6 As shown, two stator blades 2 can be provided with their leading flanges 5 at the circumferential notch 15, and the two stator blades 2's leading flanges 5 are circumferentially adjacent at the circumferential notch 15. One stator blade 2's leading flange 5 is inserted into the front annular groove 6 on the counterclockwise side and extends out of the front annular groove 6 through the inlet 14 on the clockwise side, located at the circumferential notch 15. The other stator blade 2's leading flange 5 is inserted into the front annular groove 6 on the clockwise side and extends out of the front annular groove 6 through the inlet 14 on the counterclockwise side, located at the circumferential notch 15. This prevents one stator blade 2's leading flange 5 from being completely located at the circumferential notch 15 and not inserted into the front annular groove 6, thus preventing the stator blade 2 from being fixed to the front stage casing 1.

[0061] like Figure 8 As shown, a third mating part 16 can be provided on the rear flange 7. For example... Figure 7 As shown, a fourth mating part can be provided in the rear annular groove 8. Figure 7 Not shown in the figure, its position is approximately at reference numeral 17. When the rear flange 7 is inserted into the rear annular groove 8, the third mating part 16 and the fourth mating part cooperate to restrict the rear flange 7 from rotating circumferentially within the rear annular groove 8. The fourth mating part can be a stop, and the third mating part 16 can be a stopped part. The fourth mating part blocks the third mating part 16 circumferentially, thereby preventing the rear flange 7 from rotating circumferentially within the rear annular groove 8.

[0062] like Figure 7 As shown, the fourth mating part may include a pin, the pin being in... Figure 7 Not shown in the figure, its position is approximately at reference numeral 17. The pin protrudes axially from the shaft end face of the rear annular groove 8. A pin hole 17 may be provided on the shaft end face of the rear annular groove 8. The pin is inserted into the pin hole 17, and the pin protrudes axially forward from the shaft end face of the rear annular groove 8. The pin and the pin hole 17 can be an interference fit, and an H7 / r6 fit is recommended to prevent the pin from loosening in the pin hole 17. Figure 8 As shown, the third mating part 16 may include an anti-rotation groove 18, which is axially recessed from the rear end face of the rear flange 7 and has sidewalls 19 on both circumferential sides. When the rear flange 7 is inserted into the rear annular groove 8, a pin is inserted into the anti-rotation groove 18, and the pin blocks the two sidewalls 19 of the anti-rotation groove 18 in the circumferential direction, thereby preventing the rear flange 7 from rotating circumferentially within the rear annular groove 8. Both the pin and the anti-rotation groove 18 extend axially. When the subsequent stage casing 3 is fixed to the stator blade 2, the rear annular groove 8 is inserted axially into the rear flange 7, and the pin is inserted axially into the anti-rotation groove 18. When the subsequent stage casing 3 is disassembled from the stator blade 2, the rear annular groove 8 is disengaged axially from the rear flange 7, and the pin is disengaged axially from the anti-rotation groove 18.

[0063] A compressor includes a stator assembly as described above. The compressor may include multiple stators and multiple rotors, wherein at least one stator is the stator assembly described above.

[0064] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention.

Claims

1. A stator assembly characterized by The stator vane includes: a stator vane provided with a mounting seat at an outer peripheral side, the mounting seat being provided with a front flange at a front end face, and the mounting seat being provided with a rear flange protruding in an axial direction at a rear end face; a front stage casing located at a front side of the stator vane, the front stage casing being provided with a front ring groove at a rear end face, the front ring groove being inserted with the front flange to fix the stator vane and the front stage casing; and a rear stage casing located at a rear side of the stator vane, the rear stage casing being provided with a rear ring groove recessed in an axial direction at a front end face, the rear ring groove being inserted with the rear flange to fix the stator vane and the rear stage casing; wherein the front flange is provided with a first matching part, the front ring groove is provided with a second matching part, the second matching part is matched with the first matching part to limit the front flange from being pulled out of the front ring groove in an axial direction when the front ring groove is inserted with the front flange, the first matching part includes a first wedge-shaped convex ring, the second matching part includes a second wedge-shaped convex ring, and the second wedge-shaped convex ring blocks a passage of the first wedge-shaped convex ring from being pulled out in an axial direction; the front stage casing is an integral ring casing, the front ring groove is provided with a circumferential notch in a circumferential direction, a central angle of the circumferential notch is greater than a central angle of the front flange of one stator vane, and the front flange is inserted into the front ring groove in a circumferential direction through the circumferential notch; and the rear flange is provided with a third matching part, the rear ring groove is provided with a fourth matching part, the third matching part is matched with the fourth matching part to limit the rear flange from rotating in a circumferential direction in the rear ring groove when the rear flange is inserted into the rear ring groove.

2. The stator assembly according to claim 1, wherein: the first wedge-shaped convex ring is located at an inner peripheral side of the front flange, and the second wedge-shaped convex ring is located at an inner peripheral side of the front ring groove.

3. The stator assembly according to claim 1, wherein: the first wedge-shaped convex ring is located at an outer peripheral side of the front flange, and the second wedge-shaped convex ring is located at an outer peripheral side of the front ring groove.

4. The stator assembly according to claim 1, wherein: the circumferential notch is provided with the front flanges of two stator vanes, the front flange of one stator vane is inserted into the front ring groove at an anticlockwise side and located at the circumferential notch at a clockwise side, and the front flange of another stator vane is inserted into the front ring groove at a clockwise side and located at the circumferential notch at an anticlockwise side.

5. The stator assembly according to claim 1, wherein: the fourth matching part includes a pin protruding in an axial direction from an axial end face of the rear ring groove, the third matching part includes an anti-rotation groove recessed in an axial direction from a rear end face of the rear flange, and the pin is inserted into the anti-rotation groove. The stator assembly according to any one of claims 1 to 5.

6. A compressor characterized by, ​

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