Compressor stator and method of assembling and disassembling thereof

Abstract

A compressor stator and its assembling and disassembling methods are used to improve the inconvenience of disassembling the stator blade and the rear stage casing. The compressor stator comprises a stator blade, a front stage casing and a rear stage casing. The stator blade is provided with a mounting seat on the outer peripheral side. The mounting seat is provided with a front flange on the front end face. The front flange is inclinedly protruded from the front end face to the inner peripheral side. The mounting seat is provided with a rear flange on the rear end face. The rear flange is axially protruded from the rear end face. The front stage casing is located on the front side of the stator blade. The front stage casing is provided with a front groove on the rear end face. The front groove is inclinedly recessed from the rear end face to the inner peripheral side. The rear stage casing is located on the rear side of the stator blade. The rear stage casing is provided with a rear groove on the front end face. The rear groove is axially recessed from the front end face. The front flange is inserted into the front groove. The rear flange is inserted into the rear groove to fix the stator blade.

Description

Technical Field

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

[0002] As shown in the diagram, 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 compressor stator, a compressor stator assembly method, and a compressor stator disassembly method, in order to improve the inconvenience of disassembling the stator blades from the subsequent stage casing.

[0004] In a first aspect, the present invention provides a compressor stator. According to an embodiment of the present invention, the compressor stator includes stator blades, a front stage casing, and a rear stage casing. The stator blades are provided with mounting seats on their outer peripheral side. The mounting seats have a front flange on their front end face, which protrudes obliquely from the front end face towards the inner peripheral side. The mounting seats also have a rear flange on their rear end face, which protrudes axially from the rear end face. The front stage casing is located in front of the stator blades and has a front groove on its rear end face, which is obliquely recessed towards the inner peripheral side from the rear end face. The rear stage casing is located behind the stator blades and has a rear groove on its front end face, which is recessed axially from the front end face. The front flange is inserted into the front groove, and the rear flange is inserted into the rear groove to fix the stator blades.

[0005] In one or more embodiments, the front flange extends circumferentially and has a first outer diameter and a first inner diameter at the front end face, the front groove extends circumferentially and has a second outer diameter and a second inner diameter at the inlet, the first outer diameter is smaller than the second outer diameter, the first inner diameter is smaller than the second inner diameter, and the second outer diameter minus the second inner diameter is greater than the first outer diameter minus the first inner diameter.

[0006] In one or more embodiments, the front flange is inserted into the front groove, the outer peripheral surface of the front flange is incised into the outer peripheral surface of the front groove, the inner peripheral surface of the front flange abuts against the inner peripheral surface of the front groove at both circumferential ends, and has a radial distance between the two ends of the front flange and the inner peripheral surface of the front groove.

[0007] Secondly, the present invention provides a compressor stator assembly method. According to an embodiment of the present invention, the assembly method is used to assemble the above-mentioned compressor stator. The assembly method includes step A. inserting the front flange of the stator blade mounting seat into the front groove of the front stage casing at an inward peripheral angle, so as to fix the stator blade to the front stage casing; and step B. inserting the rear groove of the rear stage casing axially into the rear flange of the mounting seat of the stator blade, so as to fix the stator blade to the rear stage casing.

[0008] Thirdly, the present invention provides a method for disassembling a compressor stator. According to an embodiment of the present invention, the disassembly method is used to disassemble the above-mentioned compressor stator. The disassembly method includes step A. pulling the rear groove of the rear stage casing out axially from the rear flange of the stator blade mounting seat to disassemble the rear stage casing and the stator blade; and step B. pulling the front flange of the stator blade mounting seat out obliquely to the inner circumferential side from the front groove of the front stage casing to disassemble the stator blade and the front stage casing.

[0009] The embodiments of the present invention have at least the following beneficial effects:

[0010] The front flange and front groove are inclined inward to restrict the movement direction of the front flange from being pulled out of the front groove. The rear flange and rear groove are set along the axial direction to restrict the movement direction of the rear groove from being pulled out of the rear flange. During the process of decomposing the compressor stator, when the downstream casing is subjected to a decomposition force in the axial direction, the front flange cannot be pulled out of the front groove along the axial direction. The stator blades remain fixed with the upstream casing. The decomposition force then acts to pull the rear groove out of the rear flange, and the downstream casing and stator blades are successfully decomposed. Attached Figure Description

[0011] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0012] Figure 1 This is a cross-sectional view of the compressor stator and compressor rotor in the prior art.

[0013] Figure 2 This is a cross-sectional view of the compressor stator of the present invention;

[0014] Figure 3 This is a schematic diagram of step A of the compressor stator assembly method of the present invention;

[0015] Figure 4 This is a schematic diagram of step B of the compressor stator assembly method of the present invention;

[0016] Figure 5 This is a schematic diagram of step A of the compressor stator decomposition method of the present invention;

[0017] Figure 6 This is a schematic diagram of step B of the compressor stator decomposition method of the present invention;

[0018] Figure 7 This is a partial cross-sectional view of the compressor stator of the present invention;

[0019] Figure 8 This is a partial cross-sectional view of the compressor stator of the present invention;

[0020] Figure 9 This is a partial cross-sectional view of the compressor stator of the present invention;

[0021] Figure label:

[0022] 1-Pre-amplifier casing;

[0023] 2-Stationary blades;

[0024] 3-Power stage casing;

[0025] 4-Rotor;

[0026] 5-Anterior flange;

[0027] 6-Front groove;

[0028] 7-Rear flange;

[0029] 8-Rear groove;

[0030] 9-Mounting base;

[0031] 10 - Second radial interval. Detailed Implementation

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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 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 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 groove 8 are difficult to separate during the axial disassembly of the subsequent stage casing 3. Consequently, the subsequent stage casing 3 is difficult to separate from the stator blade 2. The disassembly force causes the front flange 5 and front 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.

[0036] Figures 2 to 9 The present invention illustrates the compressor stator, compressor stator assembly method, and compressor stator disassembly method, wherein some structural details are omitted. Figure 2 As shown, the compressor stator 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 obliquely from the front end face of the mounting base 9 towards the inner periphery. The front flange 5 can be a conical wall, protruding axially from the front end face of the mounting base 9 and obliquely towards the inner periphery. 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. The rear flange 7 can be an annular wall, protruding from the rear end face of the mounting base 9, with the protrusion direction parallel to the central axis of the compressor.

[0037] like Figure 2 As shown, the front stage casing 1 is located in front of the stator blade 2. The front stage casing 1 has a front groove 6 on its rear end face. The front groove 6 is recessed inward from the rear end face of the front stage casing 1. The front groove 6 can be a conical groove, which is axially recessed from the rear end face of the front stage casing 1 and inclined inward.

[0038] like Figure 2As shown, the afterstage casing 3 is located behind the stator blade 2. The afterstage casing 3 has a rear groove 8 on its front end face, which is recessed axially from the front end face of the afterstage casing 3. The rear groove 8 can be an annular groove, recessed from the front end face of the afterstage casing 3, with the recess direction parallel to the central axis of the compressor.

[0039] like Figure 2 As shown, the front flange 5 and the front groove 6 are inserted into each other at an inward circumferential angle, thereby fixing the stator blade 2 to the front stage housing 1. The rear flange 7 and the rear groove 8 are inserted into each other axially, thereby fixing the stator blade 2 to the rear stage housing 3, and then fixing the stator blade 2 to the housing.

[0040] The compressor stator assembly method for assembling the compressor stator of the present invention is as follows: Figure 3 and Figure 4 As shown in the image. Figure 3 As shown, the compressor stator assembly method includes step A. The front flange 5 of the mounting seat 9 of the stator blade 2 is inserted into the front groove 6 of the front stage casing 1 at an inward circumferential angle, thereby fixing the stator blade 2 to the front stage casing 1. Figure 3 The arrow in the figure indicates the direction in which the front flange 5 is inserted into the front groove 6. The front flange 5 is inserted into the front groove 6 axially and inclined inwards.

[0041] like Figure 4 As shown, the compressor stator assembly method also includes step B. Inserting the rear groove 8 of the rear stage casing 3 axially into the rear flange 7 of the mounting seat 9 of the stator blade 2, thereby fixing the rear stage casing 3 to the stator blade 2. Figure 4 The arrows in the diagram indicate the direction in which the rear groove 8 is inserted into the rear flange 7, and the rear groove 8 is inserted into the rear flange 7 axially.

[0042] The compressor stator decomposition method for decomposing the compressor stator of the present invention is as follows: Figure 5 and Figure 6 As shown in the image. Figure 5 As shown, the compressor stator disassembly method includes step A. Pulling the rear groove 8 of the afterstage casing 3 axially out of the rear flange 7 of the mounting seat 9 of the stator blade 2, thereby disassembling the afterstage casing 3 from the stator blade 2. Figure 5 The arrows in the diagram indicate the direction in which the rear groove 8 is pulled out of the rear flange 7, and the rear groove 8 is pulled out of the rear flange 7 axially.

[0043] like Figure 6 As shown, the compressor stator disassembly method further includes step B. The front flange 5 of the mounting seat 9 of the stator blade 2 is pulled out of the front groove 6 of the front stage casing 1 at an inward circumferential angle, thereby disassembling the stator blade 2 from the front stage casing 1. Figure 6 The arrow in the image indicates the direction in which the front flange 5 is pulled out of the front groove 6. The front flange 5 is pulled out of the front groove 6 axially and inclined inwards.

[0044] The inward tilt of the front flange 5 and the front groove 6 restricts the movement of the front flange 5 into and out of the front groove 6. Both movements must be inward tilted to prevent insertion and removal. Similarly, the axial orientation of the rear flange 7 and the rear groove 8 restricts the movement of the rear groove 8 into and out of the rear flange 7. During the decomposition of the compressor stator, when the downstream casing 3 is subjected to an axially rearward decomposition force to pull the rear groove 8 out of the rear flange 7, the front groove 6 applies an axially forward resistance to the front flange 5. The front flange 5 cannot be pulled out of the front groove 6 axially, and the stator blade 2 remains fixed to the upstream casing 1. The stator blade 2 does not move axially rearward from the downstream casing 3. The decomposition force then pulls the rear groove 8 out of the rear flange 7, allowing the downstream casing 3 and stator blade 2 to decompose smoothly.

[0045] like Figures 7 to 9 As shown, the front flange 5 can extend circumferentially to form the aforementioned conical wall. The front flange 5 has a first outer diameter R3 and a first inner diameter R4 on its front end face. The first outer diameter R3 is the radius of the outer edge of the front end face of the front flange 5, and the first inner diameter R4 is the radius of the inner edge of the front end face of the front flange 5. The front groove 6 can extend circumferentially to form the aforementioned conical groove. The front groove 6 has a second outer diameter R1 and a second inner diameter R2 at its inlet. The second outer diameter R1 is the radius of the outer edge of the inlet of the front groove 6, and the second inner diameter R2 is the radius of the inner edge of the inlet of the front groove 6. The first outer diameter R3 is smaller than the second outer diameter R1, the first inner diameter R4 is smaller than the second inner diameter R2, and the second outer diameter R1 minus the second inner diameter R2 is greater than the first outer diameter R3 minus the first inner diameter R4, expressed by the formula (R1 - R2) > (R3 - R4). This allows the front groove 6 to contain the front flange 5 in the radial direction, and the front groove 6 does not interfere with the front flange 5 in the radial direction. When the front flange 5 is inserted into the front groove 6 at an inward circumferential angle, the front flange 5 is smoothly inserted into the front groove 6.

[0046] Furthermore, such as Figures 7 to 9As shown, a first outer diameter R3, a first inner diameter R4, a second outer diameter R1, and a second inner diameter R2 are provided. When the front flange 5 is inserted into the front groove 6, the outer circumferential surface of the front flange 5 is tangent to the outer circumferential surface of the front groove 6. Radially, the outer circumferential surface of the front flange 5 abuts against the outer circumferential surface of the front groove 6 at the circumferential center, and the outer circumferential surface of the front flange 5 has a first radial distance from the outer circumferential surface of the front groove 6 on both sides at the circumferential center. When the front flange 5 is inserted into the front groove 6, the inner circumferential surface of the front flange 5 abuts against the inner circumferential surface of the front groove 6 at both circumferential ends, and the inner circumferential surface of the front flange 5 has a second radial distance 10 from the inner circumferential surface of the front groove 6 between the two circumferential ends. The outer circumferential surface of the front flange 5 abuts against the outer circumferential surface of the front groove 6, and the inner circumferential surface of the front flange 5 abuts against the inner circumferential surface of the front groove 6. Furthermore, as mentioned above, the second outer diameter R1 minus the second inner diameter R2 is greater than the first outer diameter R3 minus the first inner diameter R4, so that the inner circumferential surface of the front flange 5 and the inner circumferential surface of the front groove 6 have a second radial distance 10, ensuring that the front groove 6 radially encloses the front flange 5, thereby ensuring that the front flange 5 is smoothly inserted into the front groove 6.

[0047] like Figure 9 As shown, exemplarily, the entire stator blade 2 is divided into 8 to 12 sector segments, each stator blade sector segment having a circumferential angle of 45° to 30°. The first outer diameter R3 is 299 mm, the first inner diameter R4 is 296.15 mm, the second outer diameter R1 is 300 mm, the second inner diameter R2 is 297 mm, and the maximum value of the second radial spacing 10 at the circumferential center is (R1 - R2) - (R3 - R4) = 0.15 mm. The angle range of the arc of the first inner diameter R4 on the outer circumference of the arc of the second inner diameter R2 is 63°, satisfying the installation of the stator blade sector segments.

[0048] 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 compressor stator, characterized in that... include: The stator blade has a mounting base on its outer peripheral side. The mounting base has a front flange on its front end face, which protrudes obliquely from the front end face to the inner peripheral side. The mounting base has a rear flange on its rear end face, which protrudes axially from the rear end face. The front-stage casing is located in front of the stator blade and has a front groove on its rear end face. The front groove is recessed inward from the rear end face towards the inner circumference. as well as The rear stage casing, located behind the stator blade, has a rear groove on its front end face, which is recessed axially from the front end face. The front flange is inserted into the front groove, and the rear flange is inserted into the rear groove to fix the stator blade. The front flange extends circumferentially and has a first outer diameter and a first inner diameter at the front end face. The front groove extends circumferentially and has a second outer diameter and a second inner diameter at the inlet. The first outer diameter is smaller than the second outer diameter, the first inner diameter is smaller than the second inner diameter, and the second outer diameter minus the second inner diameter is greater than the first outer diameter minus the first inner diameter. The front flange is inserted into the front groove, the outer peripheral surface of the front flange is incised into the outer peripheral surface of the front groove, the inner peripheral surface of the front flange abuts against the inner peripheral surface of the front groove at both circumferential ends, and has a radial distance between the two ends of the front flange and the inner peripheral surface of the front groove.

2. A method for assembling a compressor stator, characterized in that... For assembling the compressor stator as described in claim 1, the assembly method includes: Step A. Insert the front flange of the stator blade mounting seat into the front groove of the pre-stage housing at an inward circumferential angle, thereby securing the stator blade to the pre-stage housing; and Step B. Insert the rear groove of the rear stage casing axially into the rear flange of the mounting seat of the stator blade to fix the stator blade to the rear stage casing.

3. A method for decomposing compressor stators, characterized in that... The method for decomposing the compressor stator as described in claim 1 includes: Step A. Pull the rear recess of the post-stage casing axially out of the rear flange of the stator blade mounting seat to separate the post-stage casing from the stator blade; and Step B. Pull the front flange of the mounting base of the stator blade out of the front groove of the pre-stage casing at an inward circumferential angle to separate the stator blade from the pre-stage casing.

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