Stator assembly and gas compressor

Abstract

A stator assembly and a gas compressor are used for improving the condition that a stator blade and a rear-stage casing are inconvenient to disassemble. The stator assembly comprises stator blades, a front-stage casing and a rear-stage casing. A mounting seat is arranged on the peripheral side of the stator blade, a front flange is arranged on the front end face of the mounting seat, and a rear flange protruding in the axial direction is arranged on the rear end face of the mounting seat. The front-stage casing is located on the front side of the stator blade, a front annular groove is formed in the rear end face of the front-stage casing, and the front flange is inserted into the front annular groove so as to fix the stator blade and the front-stage casing. The rear-stage casing is located on the rear side of the stator blade, a rear annular groove which is sunken in the axial direction is formed in the front end face of the rear-stage casing, and the rear flange is inserted into the rear annular groove so that the stator blade and the rear-stage casing can be fixed. Wherein the front flange is provided with a first matching part, the front annular groove is provided with a second matching part, and when the front annular groove is connected with the front flange in an inserted mode, the second matching part is matched with the first matching part to limit the front flange to be separated from the front annular groove in the axial direction.

Description

Technical Field

[0001] The present invention relates to the field of aeroengines, and in particular to a stator assembly and a compressor. Background Art

[0002] like Figure 1 As shown, when assembling the compressor, the rotor is assembled first, and the multi-stage rotor is assembled into a whole, and then the front-stage casing, stator blades and rear-stage casing are installed step by step. When disassembling the compressor, the rear-stage casing is disassembled first, then the stator blades are disassembled, and then the front-stage casing is disassembled. Since the stator blades and the rear-stage casing will be slightly deformed after the aircraft engine is operated, it is difficult to separate the rear-stage casing from the stator blades when disassembling the rear-stage casing. The disassembly force causes the stator blades to separate from the front-stage casing, and the stator blades move axially to the rear side along the rear-stage casing until the stator blades hit the rotor, causing damage to the rotor and the stator blades. Summary of the invention

[0003] The object of the present invention is to provide a stator assembly and a compressor, which are used to improve the inconvenience of disassembling the stator blades and the rear-stage casing.

[0004] In the 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 front-stage casing and a rear-stage casing; a mounting seat is provided on the outer peripheral side of the stator blade, and the mounting seat is provided with a front flange on the front end face, and the mounting seat is provided with a rear flange protruding along the axial direction on the rear end face; the front-stage casing is located at the front side of the stator blade, and a front annular groove is provided on the rear end face, and the front annular groove is plugged into the front flange to fix the stator blade and the front-stage casing; the rear-stage casing is located at the rear side of the stator blade, and a rear annular groove is provided on the front end face that is recessed along the axial direction, and the rear annular groove is plugged into the rear flange to fix the stator blade and the rear-stage casing; wherein, the front flange is provided with a first matching portion, and the front annular groove is provided with a second matching portion, and when the front annular groove is plugged into the front flange, the second matching portion cooperates with the first matching portion to limit 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 protruding ring, and the second mating portion includes a second wedge-shaped protruding ring, and the second wedge-shaped protruding ring blocks a path for the first wedge-shaped protruding ring to escape in the axial direction.

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

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

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

[0009] In one or more embodiments, the front-stage casing is a full-ring casing, the front ring groove is provided with a circumferential notch, the central angle of the circumferential notch is larger than the central angle of the front flange of one of the stator blades, and the front flange is circumferentially inserted into the front ring groove through the circumferential notch.

[0010] In one or more embodiments, the circumferential notch is provided with the front flanges of two stator blades, the front flange of one stator blade is inserted into the front annular groove on the counterclockwise side and is located in the circumferential notch on the clockwise side, and the front flange of the other stator blade is inserted into the front annular groove on the clockwise side and is located in the circumferential notch on the counterclockwise side.

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

[0012] In one or more embodiments, the fourth mating portion includes a pin, which protrudes axially from the axial end face of the rear ring groove, and the third mating portion includes an anti-rotation groove, which is axially recessed from the rear end face of the rear flange, and the pin is inserted into the anti-rotation groove.

[0013] In a second aspect, the present invention provides a compressor. According to an embodiment of the present invention, the compressor includes the above-mentioned stator assembly.

[0014] The embodiments of the present invention have at least the following beneficial effects:

[0015] The rear flange and the rear ring groove extend axially to restrict the movement direction of the rear ring groove from the rear flange to be along the axial direction. In the process of disassembling the stator assembly, when the rear-stage casing is applied with a disassembly force toward the axial rear side so that the rear ring groove is pulled out of the rear flange axially, the second matching portion blocks the first matching portion from being disengaged axially, preventing the front flange from being disengaged axially from the front ring groove. The stator blades do not move axially to the rear side with the rear-stage casing to separate from the front-stage casing, but are fixed to the front-stage casing. The disassembly force acts to pull the rear ring groove out of the rear flange, and the rear-stage casing and the stator blades are smoothly disassembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0017] Figure 1 A cross-sectional view of a stator assembly and a compressor rotor of the prior art;

[0018] Figure 2 is a cross-sectional view of a stator assembly of the present invention;

[0019] Figure 3 is a cross-sectional view of a stator assembly of the present invention;

[0020] Figure 4 is a cross-sectional view of a stator assembly of the present invention;

[0021] Figure 5 It is a schematic diagram of the front flange of the stator assembly of the present invention being inserted into the front annular groove along the circumferential direction;

[0022] Figure 6 It is a schematic diagram of the front flanges of a plurality of stator blades in the stator assembly of the present invention distributed in the circumferential direction of the front annular groove;

[0023] Figure 7 It is a partial schematic diagram of the rear ring groove in the stator assembly of the present invention;

[0024] Figure 8 It is an oblique view of a stator blade in a stator assembly of the present invention;

[0025] Reference numerals:

[0026] 1-front stage receiver;

[0027] 2-Stator blades;

[0028] 3-rear stage receiver;

[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 matching portion;

[0036] 11- second matching portion;

[0037] 12-first wedge-shaped protruding ring;

[0038] 13- second wedge-shaped convex ring;

[0039] 14-Entrance;

[0040] 15- circumferential notch;

[0041] 16- third matching part;

[0042] 17-pin hole;

[0043] 18- Anti-rotation groove;

[0044] 19-Side wall surface. DETAILED DESCRIPTION

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

[0046] It should be noted that these and other subsequent drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0047] The terms "first", "second", etc. may be used interchangeably to distinguish one feature from another, and are not intended to mean that each feature must be located as shown in the figures in each embodiment.

[0048] The compressor stator and compressor rotor are both rotating bodies. Figure 1 FIG. 2 shows a cross-sectional structure of the central axis of the compressor in the prior art. Figure 1 As shown, in the compressor, the stator blades 2 are fixed to the front-stage casing 1 by the front flange 5 and the front annular groove 6 plugged in along the axial direction, and the stator blades 2 are fixed to the rear-stage casing 3 by the rear flange 7 and the rear annular groove 8 plugged in along the axial direction. The stator blades 2 are provided with a mounting seat 9 on the outer peripheral side, and the front flange 5 and the rear flange 7 are provided on the mounting seat 9. When assembling the compressor, the rotor 4 is assembled first, and the multi-stage rotor 4 is assembled into a whole, and then the front-stage casing 1, the stator blades 2 and the rear-stage casing 3 are installed step by step along the axial direction. When disassembling the compressor, the rear-stage casing 3 is disassembled axially first, and then the stator blades 2 are disassembled axially, and then the front-stage casing 1 is disassembled. Since the stator blades 2 and the rear casing 3 will be slightly deformed after the operation of the aircraft engine, when the rear casing 3 is decomposed in the axial direction, the rear flange 7 and the rear ring groove 8 are difficult to disengage, and the rear casing 3 is difficult to separate from the stator blades 2. The decomposition force causes the front flange 5 and the front ring groove 6 to disengage in the axial direction, and the stator blades 2 are separated from the front casing 1. The stator blades 2 move axially to the rear side along the rear casing 3 until the stator blades 2 hit the rotor 4, causing damage to the rotor 4 and the stator blades 2. In addition, since the stator blades 2 are covered by the rear casing 3, the rear flange 7 is inaccessible and it is impossible to apply force to the rear flange 7, resulting in the inability to decompose the stator blades 2 and the rear casing 3.

[0049] Figures 2 to 8 FIG. 2 shows a stator assembly of the present invention, wherein the display of some structures is omitted. 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 incoming flow direction of the air in the compressor, and "rear" refers to the outgoing flow direction of the air in the compressor, the same below. The stator blade 2 is provided with a mounting seat 9 on the outer peripheral side. The mounting seat 9 is provided with a front flange 5 on the front end face, and the front flange 5 protrudes from the front end face of the mounting seat 9. The front flange 5 can be an annular wall extending in the circumferential direction. "Circumferential" is the rotation direction of the compressor stator rotating body, the same below. The mounting seat 9 is provided with a rear flange 7 on the rear end face, and the rear flange 7 protrudes axially from the rear end face of the mounting seat 9. "Axial" is a direction parallel to the central axis of the compressor, the same below. The rear flange 7 can be an annular wall extending in the circumferential direction.

[0050] like Figures 2 to 4 As shown, the front-stage casing 1 is located at the front side of the stator blade 2, and the front-stage casing 1 is provided with a front annular groove 6 on the rear end surface, and the front annular groove 6 is recessed from the rear end surface of the front-stage casing 1 and extends in the circumferential direction. The front flange 5 is inserted into the front annular groove 6, and the stator blade 2 is fixed to the front-stage casing 1.

[0051] like Figures 2 to 4 As shown, the rear stage casing 3 is located at the rear side of the stator blade 2, and the rear stage casing 3 is provided with a rear annular groove 8 on the front end surface, and the rear annular groove 8 is axially recessed from the front end surface of the rear stage casing 3 and extends circumferentially. The rear flange 7 is inserted into the rear annular groove 8, and then the stator blade 2 is fixed to the rear stage casing 3.

[0052] like Figures 2 to 4 As shown, the front flange 5 is provided with a first matching portion 10, and the front ring groove 6 is provided with a second matching portion 11. When the front ring groove 6 is inserted into the front flange 5, the second matching portion 11 cooperates with the first matching portion 10 to limit the front flange 5 from axially escaping from the front ring groove 6. The second matching portion 11 can be a blocking member, and the first matching portion 10 can be a blocked member. The second matching portion 11 blocks the passage for the first matching portion 10 to axially escaping, thereby preventing the front flange 5 from axially escaping from the front ring groove 6.

[0053] The rear flange 7 and the rear annular groove 8 extend axially, and the movement direction of the rear annular groove 8 from the rear flange 7 must be axial. In the process of disassembling the stator assembly, when the disassembly force is applied to the rearward axial side of the rear casing 3 so that the rear annular groove 8 is pulled out of the rear flange 7 axially, the second matching portion 11 blocks the first matching portion 10 from being disengaged axially, preventing the front flange 5 from being disengaged axially from the front annular groove 6, and the stator blades 2 do not move axially backward with the rear casing 3 to separate from the front casing 1, but are fixed to the front casing 1, and the disassembly force acts to pull the rear annular groove 8 out of the rear flange 7, and the rear casing 3 and the stator blades 2 are smoothly disassembled.

[0054] like Figures 2 to 4As shown, the first matching portion 10 may be a first wedge-shaped convex ring 12, and the first wedge-shaped convex ring 12 has an inclined wall surface facing the rear side. The second matching portion 11 may be a second wedge-shaped convex ring 13, and the second wedge-shaped convex ring 13 has an inclined wall surface facing the front side. The inclined wall surface of the second wedge-shaped convex ring 13 blocks the path of the inclined wall surface of the first wedge-shaped convex ring 12 moving toward the rear side, and the second wedge-shaped convex ring 13 blocks the path of the first wedge-shaped convex ring 12 axially escaping, thereby preventing the front flange 5 from axially escaping from the front ring groove 6.

[0055] Figure 2 A stator assembly is shown, such as Figure 2 As shown, the first wedge-shaped convex ring 12 may be located on the outer peripheral side of the front flange 5, the outer peripheral surface of the front flange 5 bulges toward the outer peripheral side from back to 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 may extend in the axial direction. The second wedge-shaped convex ring 13 may be located on the outer peripheral side of the front ring groove 6, the outer peripheral surface of the front ring groove 6 bulges toward the inner peripheral side from front to back, the accommodating space of the front ring groove 6 bulges toward the outer peripheral side from back to 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 may extend in the axial direction.

[0056] Figure 3 Another stator assembly is shown, such as Figure 3 As shown, the first wedge-shaped convex ring 12 may be located on the inner circumference side of the front flange 5, the inner circumference of the front flange 5 bulges toward the inner circumference from back to 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 circumference of the front flange 5 may extend in the axial direction. The second wedge-shaped convex ring 13 may be located on the inner circumference side of the front annular groove 6, the inner circumference of the front annular groove 6 bulges toward the outer circumference from front to back, the accommodation space of the front annular groove 6 bulges toward the inner circumference from back to front, the radial height of the bottom of the front annular groove 6 is greater than the radial height of the mouth of the front annular groove 6, and the outer circumference of the front annular groove 6 may extend in the axial direction.

[0057] Figure 4 Another stator assembly is shown, and only the relative Figure 3 The difference between the stator assembly shown in the figure is described, the outer circumference of the front flange 5 can be raised from the back to the front to the inner circumference side, parallel to the inner circumference of the front flange 5, the radial thickness of the front flange 5 from the root to the head is constant, and the front flange 5 extends obliquely to the inner circumference side. The outer circumference of the front annular groove 6 can be raised from the back to the front to the inner circumference side, parallel to the inner circumference of the front annular groove 6, the radial height of the front annular groove 6 from the mouth to the bottom is constant, and the front annular groove 6 extends obliquely to the inner circumference side.

[0058] The second matching portion 11 cooperates with the first matching portion 10 to limit the front flange 5 from axially escaping from the front annular groove 6, so that when the stator blade 2 is installed on the front stage casing 1, the second matching portion 11 blocks the first matching portion 10, and the front flange 5 cannot be inserted from the mouth of the front annular groove 6 to the bottom. Figure 5 and Figure 6 As shown, the front annular groove 6 may be provided with an inlet 14 in the circumferential direction, and the inlet 14 is located at the circumferential end of the front annular groove 6. The front annular groove 6 may be provided with an inlet 14 at one or both ends in the circumferential direction, and the front flange 5 is inserted into the front annular groove 6 in the circumferential direction through the inlet 14, so that the front annular groove 6 and the front flange 5 are plugged. In the process of the front flange 5 being inserted into the front annular groove 6 in the circumferential direction through the inlet 14, the front flange 5 slides in the front annular groove 6 in the circumferential direction.

[0059] like Figure 5 and Figure 6 As shown, the front stage casing 1 can be a full ring casing, formed by rotating 360° along the circumferential direction, and the structure is continuous in the circumferential direction. The front ring groove 6 can be provided with a circumferential notch 15, and the circumferential notch 15 makes the front ring groove 6 disconnected in the circumferential direction, and two entrances 14 are formed 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 front flange 5 of a stator blade 2, so that the circumferential length of the circumferential notch 15 is greater than the circumferential length of the front flange 5 of a stator blade 2, and the circumferential notch 15 can allow the front flange 5 of a stator blade 2 to enter. Figure 5 The arrow in the figure shows by way of example the direction in which the front flange 5 of a stator blade 2 is inserted into the front annular groove 6. Figure 5 As shown, the front flange 5 of a stator blade 2 may 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 circumferential distribution of the front flanges 5 of the plurality of stator blades 2 plugged into the front annular grooves 6 is shown in FIG. Figure 6 As shown, the front flanges 5 of two stator blades 2 can be arranged at the circumferential notch 15, and the front flanges 5 of the two stator blades 2 are circumferentially adjacent at the circumferential notch 15. The front flange 5 of one stator blade 2 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, and is located in the circumferential notch 15. The front flange 5 of another stator blade 2 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, and is located in the circumferential notch 15. This prevents the front flange 5 of a stator blade 2 from being completely located in the circumferential notch 15 and not being inserted into the front annular groove 6, which makes it impossible for the stator blade 2 to be fixed to the front-stage casing 1.

[0061] like Figure 8 As shown, the rear flange 7 may be provided with a third matching portion 16. Figure 7 As shown, the rear annular groove 8 can be provided with a fourth matching portion, and the fourth matching portion is Figure 7 The third matching portion 16 is not shown in the figure, and its position is approximately at the reference numeral 17. When the rear flange 7 is inserted into the rear annular groove 8, the third matching portion 16 cooperates with the fourth matching portion to limit the circumferential rotation of the rear flange 7 in the rear annular groove 8. The fourth matching portion can be a blocking member, and the third matching portion 16 can be a blocked member. The fourth matching portion blocks the third matching portion 16 in the circumferential direction, thereby preventing the rear flange 7 from circumferentially rotating in the rear annular groove 8.

[0062] like Figure 7 As shown, the fourth mating portion may include a pin, the pin being Figure 7 Not shown in the figure, its position is roughly at the reference numeral 17, the pin protrudes axially from the axial end face of the rear ring groove 8, and protrudes from the axial end face of the rear ring groove 8. The axial end face of the rear ring groove 8 can be provided with a pin hole 17, and the pin is inserted into the pin hole 17, and the pin protrudes axially from the axial end face of the rear ring groove 8 to the front side. The pin and the pin hole 17 can be interference fit, and the recommended fit is H7 / r6 to prevent the pin from loosening in the pin hole 17. Figure 8 As shown, the third matching portion 16 may include an anti-rotation groove 18, which is axially recessed from the rear end surface of the rear flange 7, and the anti-rotation groove 18 has side wall surfaces 19 on both sides of the circumference. When the rear flange 7 is inserted into the rear annular groove 8, the pin is inserted into the anti-rotation groove 18, and the pin blocks the two side wall surfaces 19 of the anti-rotation groove 18 in the circumferential direction, thereby preventing the rear flange 7 from rotating circumferentially in the rear annular groove 8. The pin and the anti-rotation groove 18 both extend axially. When the rear-stage casing 3 is fixed to the stator blades 2, the rear annular groove 8 is axially inserted into the rear flange 7, and the pin is axially inserted into the anti-rotation groove 18. When the rear-stage casing 3 is disassembled from the stator blades 2, the rear annular groove 8 is axially disengaged from the rear flange 7, and the pin is axially disengaged from the anti-rotation groove 18.

[0063] A compressor includes the stator assembly as described above. The compressor may include a multi-stage stator and a multi-stage rotor, wherein at least one stage of the stator is the stator assembly as described above.

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

Claims

1. A stator assembly, characterized in that include: The stator blade has a mounting seat arranged on the outer peripheral side, the mounting seat has a front flange arranged on the front end surface, and a rear flange protruding in the axial direction arranged on the rear end surface; A front-stage casing, located at the front side of the stator blades, is provided with a front annular groove on the rear end surface, and the front annular groove is plugged into the front flange to fix the stator blades and the front-stage casing; as well as A rear-stage casing is located at the rear side of the stator blades, and a rear annular groove is provided on the front end surface thereof, and the rear annular groove is plugged into the rear flange to fix the stator blades and the rear-stage casing; in, The front flange is provided with a first matching portion, and the front ring groove is provided with a second matching portion. When the front flange is inserted into the front ring groove, the second matching portion cooperates with the first matching portion to restrict the front flange from axially disengaging from the front ring groove.

2. The stator assembly according to claim 1, characterized in that: The first matching portion includes a first wedge-shaped convex ring, and the second matching portion includes a second wedge-shaped convex ring, wherein the second wedge-shaped convex ring blocks a path for the first wedge-shaped convex ring to escape in the axial direction.

3. The stator assembly according to claim 2, characterized in that: The first wedge-shaped protruding ring is located on the inner circumference side of the front flange, and the second wedge-shaped protruding ring is located on the inner circumference side of the front ring groove.

4. The stator assembly according to claim 2, characterized in that: The first wedge-shaped protruding ring is located at the outer peripheral side of the front flange, and the second wedge-shaped protruding ring is located at the outer peripheral side of the front ring groove.

5. The stator assembly according to claim 1, characterized in that: The front annular groove is provided with an inlet in the circumferential direction, and the front flange is inserted into the front annular groove in the circumferential direction through the inlet.

6. The stator assembly according to claim 5, characterized in that: The front stage casing is a full-ring casing, the front ring groove is provided with a circumferential notch, the central angle of the circumferential notch is greater than the central angle of the front flange of one of the stator blades, and the front flange is inserted into the front ring groove along the circumferential direction through the circumferential notch.

7. The stator assembly according to claim 6, characterized in that: The circumferential notch is provided with the front flanges of two stator blades, the front flange of one stator blade is inserted into the front annular groove on the counterclockwise side and is located in the circumferential notch on the clockwise side, and the front flange of the other stator blade is inserted into the front annular groove on the clockwise side and is located in the circumferential notch on the counterclockwise side.

8. The stator assembly according to claim 5, characterized in that: The rear flange is provided with a third matching portion, and the rear annular groove is provided with a fourth matching portion. When the rear flange is inserted into the rear annular groove, the third matching portion cooperates with the fourth matching portion to limit the circumferential rotation of the rear flange in the rear annular groove.

9. The stator assembly according to claim 8, characterized in that: The fourth matching portion includes a pin, which protrudes axially from the axial end face of the rear ring groove. The third matching portion includes an anti-rotation groove, which is axially recessed from the rear end face of the rear flange, and the pin is inserted into the anti-rotation groove.

10. A compressor, characterized in that: The invention comprises a stator assembly according to any one of claims 1 to 9.

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