Stator assembly

Abstract

A stator assembly is used for installing a stator blade sector section and a stator casing together, the stator casing comprises a front-stage casing and a rear-stage casing, a front flange of the stator blade sector section is detachably matched with a front-stage groove of the front-stage casing, a rear flange of the stator blade sector section is detachably matched with a rear-stage groove of the rear-stage casing, the stator assembly further includes front and front spacers, a rear positioning member and a rear spacer, the front positioning member being secured to the front receiver and cooperating with the front flange to retain the front flange in the front recess and adjust a fit clearance between the stator blade segment and the front receiver, the rear positioning member being secured to the rear receiver and cooperating with the rear flange to adjust a fit clearance between the stator blade segment and the rear receiver. By adjusting the matching clearance between the stationary blade fan-shaped section and the rear-stage casing, the stationary blade fan-shaped section can be prevented from moving behind the rear-stage casing in the decomposition process, meanwhile, the matching clearance between the stator casing and the stationary blade fan-shaped section can be controlled, and the machining cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of aero-engine compressors, and in particular to a stator assembly for mounting a stator vane segment with a stator case. BACKGROUND

[0002] An aero-engine is a highly complex and precise machine, which serves as the heart of an aircraft to provide power for the aircraft to fly. The aero-engine compressor is a core component of the cold end of the engine, and the compressor includes rotor blades and stator blades, and the stator blades are usually accommodated in a stator case. The common structure of the compressor stator case is two half split cases and a whole ring case: corresponding to the adjustable stator blades that need to be angle adjusted, the stator case is usually a split structure; corresponding to the stator vane segments that do not need to be angle adjusted, the stator case is usually a whole ring structure.

[0003] The installation structure of the stator vane segment is formed by the adjacent two stages of the case. In the prior art as shown in Figure 1 The stator case includes a front stage case 1 and a rear stage case 3, and the stator blades include stator vane segments arranged in the circumferential direction. The front stage case 1 includes a front stage groove 7, and the rear stage case 3 includes a rear stage groove 8, which are respectively detachably matched with the front flange 5 and the rear flange 6 of the stator vane segment 2 to realize the installation of the stator vane segment 2. Usually, the assembly sequence of the compressor is to first install the rotor 4, assemble the multiple stages of the rotor into a whole, and then install the front stage case 1, the stator vane segment 2 and the rear stage case 3 step by step. When disassembling, the rear stage case 3 is first disassembled in the axial direction, then the stator vane segment 2 is disassembled, and finally the front stage case 1 is disassembled, and so on, so that the stator case and the stator blades are disassembled.

[0004] The stator case of the prior art has many problems. On the one hand, it has been found that after the engine is operated, the stator vane segment and the stator case will usually be slightly deformed, and when the rear stage case is disassembled, it is often found that the rear flange of the stator vane segment and the rear stage groove of the rear stage case are not separated. In this case, after the front flange of the stator vane segment and the front stage groove of the front stage case are separated, the stator vane segment will move along the axial direction with the rear stage case until the stator vane segment collides with the rotor, thereby damaging the blades, causing economic losses and safety hazards. In this case, due to the deformation, the stator vane segment is wrapped by the rear stage case and the rear flange is inaccessible, so it is difficult to apply force to disassemble, which eventually leads to difficulty or even inability to disassemble.

[0005] On the other hand, in order to ensure the reliable positioning of the aero-engine stator vane segment and avoid excessive constraint causing excessive stress on the components, the assembly process needs to strictly control the matching gap between the front flange of the stator vane segment and the front stage groove of the front stage case, and the matching gap between the rear flange and the rear stage groove of the rear stage case. The control of the matching gap requires very high precision, which makes the machining difficult and costly.

[0006] Therefore, there is a need for a stator assembly that facilitates avoiding the stator vane segment from moving with the subsequent stage casing during disassembly, while facilitating controlling the fit clearance between the stator casing and the stator vane segment. SUMMARY

[0007] To solve the problems existing in the prior art, the present application provides a stator assembly, which aims to avoid the stator vane segment from moving with the subsequent stage casing during disassembly by means of a positioning member and a spacer, while facilitating controlling the fit clearance between the stator casing and the stator vane segment, so as to obtain a high-precision fit clearance, while reducing the machining precision requirement of the parts and the cost.

[0008] Therefore, the present application provides a stator assembly, which comprises a stator casing and a stator vane segment mounted on the stator casing, the stator casing comprises a front stage casing and a rear stage casing, the front stage casing comprises a front stage groove, the rear stage casing comprises a rear stage groove, the stator vane segment comprises a front flange and a rear flange, the front flange is detachably fitted with the front stage groove, and the rear flange is detachably fitted with the rear stage groove, wherein the stator assembly further comprises a front positioning member, the front positioning member is fixed to the front stage casing and fitted with the front flange to keep the front flange in the front stage groove.

[0009] According to the above technical solution, the stator assembly of the present application can achieve the following beneficial effects: by fitting the front positioning member with the front flange, the front flange of the stator vane segment is kept in the front stage groove of the front stage casing, thereby avoiding the stator vane segment from moving with the rear stage casing during disassembly.

[0010] In an embodiment of the present application, the front flange is provided with a front inclined surface, and the front positioning member is provided with a front positioning inclined surface, the front positioning inclined surface being fitted with the front inclined surface of the front flange.

[0011] According to the above technical solution, the stator assembly of the present application can achieve the following beneficial effects: by fitting the front inclined surface of the front flange with the front positioning inclined surface of the front positioning member, an axial stop effect is formed, the front flange is kept in the front stage groove, thereby avoiding the stator vane segment from moving with the rear stage casing during disassembly, and the fit clearance between the front flange and the front stage groove is adjusted by fitting the inclined surfaces.

[0012] In an embodiment of the present application, the stator assembly further comprises a front spacer, the front spacer being arranged between the front positioning member and the front stage casing, for adjusting the fit clearance between the stator vane segment and the front stage casing.

[0013] According to the above technical solution, the stator assembly of the present application can achieve the following beneficial effects: by arranging the front spacer between the front positioning member and the front stage casing, the axial positioning of the front positioning member can be adjusted, and then the positioning of the front flange is adjusted by fitting the inclined surfaces, and the fit clearance between the front flange and the front stage groove is adjusted.

[0014] In the embodiment of the application, the stator assembly further comprises a rear positioning member fixed to the rear stage casing and cooperating with the rear flange to adjust the positioning of the rear flange.

[0015] According to the above technical solution, the stator assembly of the application can achieve the following beneficial effects: through the cooperation of the rear positioning member and the rear flange, the positioning of the rear flange can be adjusted, and thus the cooperation gap therebetween can be adjusted.

[0016] In the embodiment of the application, the rear flange is provided with a rear inclined surface, and the rear positioning member is provided with a rear positioning inclined surface cooperating with the rear inclined surface of the rear flange to adjust the positioning of the rear flange.

[0017] According to the above technical solution, the stator assembly of the application can achieve the following beneficial effects: through the cooperation of the rear inclined surface of the rear flange and the rear positioning inclined surface of the rear positioning member, the cooperation gap between the rear flange and the rear stage recess can be adjusted through the cooperation of the inclined surfaces.

[0018] In the embodiment of the application, the stator assembly further comprises a rear spacer arranged between the rear positioning member and the rear stage casing to adjust the cooperation gap between the stator vane segment and the rear stage casing.

[0019] According to the above technical solution, the stator assembly of the application can achieve the following beneficial effects: through the rear spacer arranged between the rear positioning member and the rear stage casing, the positioning of the rear positioning member can be adjusted, and thus the positioning of the rear flange can be adjusted through the cooperation of the inclined surfaces, and the cooperation gap therebetween can be adjusted.

[0020] In the embodiment of the application, the front positioning member and / or the rear positioning member is a single annular member, and the corresponding front spacer and / or rear spacer is a single annular member.

[0021] According to the above technical solution, the stator assembly of the application can achieve the following beneficial effects: the stator assembly is more compact, and is more convenient to disassemble and assemble.

[0022] In the embodiment of the application, the front positioning member and / or the rear positioning member is one or more arc-shaped members for cooperating with the corresponding stator vane segment, and the corresponding front spacer and / or rear spacer is one or more arc-shaped spacers.

[0023] According to the above technical solution, the stator assembly of the application can achieve the following beneficial effects: each front positioning member and / or rear positioning member, and each front spacer and / or rear spacer can be individually disassembled and adjusted in position, and thus the stator assembly is more flexible.

[0024] In embodiments of the present application, the front stage casing includes a front stage connecting flange, the rear stage casing includes a rear stage connecting flange, and the front stage connecting flange and the rear stage connecting flange are connected by a casing fastener to secure the front stage casing and the rear stage casing together.

[0025] According to the above technical solution, the stator assembly of the present application has the following beneficial effects: the front stage casing and the rear stage casing are connected together by the casing fastener, which facilitates disassembly and maintenance.

[0026] It should be understood that the above summary is provided to introduce some choices of concepts that are further described in the detailed description. It is not meant to define the key or essential features of the claimed subject matter, the scope of which is defined by the claims. Furthermore, the claimed subject matter is not limited to implementations that solve any or all of the disadvantages noted above or in any part of this disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0027] Further features and exemplary embodiments of the present application, as well as advantages thereof over existing prior art solutions, are explained in more detail in reference to the drawings attached hereto. It is understood that the embodiments are not exhaustive of all possible embodiments of the present application. It will further be understood that some or all of the features described below can also be combined in other ways, wherein:

[0028] Figure 1 a cross-sectional view of a stator assembly according to the prior art is shown;

[0029] Figure 2 a cross-sectional view of a stator assembly according to embodiments of the present application is shown;

[0030] Figure 3 a cross-sectional view of a stator assembly according to the prior art is shown; Figure 2

[0031] Figure 4 a cross-sectional view of a stator assembly according to the prior art is shown; Figure 2

[0032] LIST OF REFERENCE NUMBERS

[0033] 1 front stage casing

[0034] 2 stator vane sector

[0035] 3 rear stage casing

[0036] 4 rotor

[0037] 5 front flange

[0038] 6 rear flange

[0039] 7 front stage recess ​​

[0040] 8 rear stage recess

[0041] 1000 static vane assembly

[0042] 1001 front stage casing

[0043] 101 front stage recess

[0044] 102 front positioning member

[0045] 103 front positioning ramp

[0046] 104 front spacer

[0047] 105 front stage connecting flange

[0048] 106 front positioning fastener

[0049] 1002 static vane segment

[0050] 201 front flange

[0051] 202 rear flange

[0052] 203 front ramp

[0053] 204 rear ramp

[0054] 1003 rear stage casing

[0055] 301 rear stage recess

[0056] 302 rear positioning member

[0057] 303 rear positioning ramp

[0058] 304 rear spacer

[0059] 305 rear stage connecting flange

[0060] 306 rear positioning fastener

[0061] 1004 rotor

[0062] 1005 casing fastener DETAILED DESCRIPTION

[0063] The application will be described more fully hereinafter with reference to the accompanying drawings, in which example embodiments of the application are shown. As would be obvious to those skilled in the art, features disclosed in this specification, or steps disclosed in any method or process described herein, can be combined in any combination, provided such a combination is not mutually exclusive. Any feature disclosed in this specification, unless explicitly described otherwise, can be replaced by an alternative feature serving the same, or a similar, purpose to the one specifically recited. The technical solutions of the application will be described in more detail hereinafter with reference to the drawings and examples.

[0064] The stator assembly according to the application can be used for mounting the stator blades of an aero-engine compressor and can be used in the field of aero-engine compressors.

[0065] In this specification, the term "axial direction" refers to a direction parallel to the central axis of the compressor, the term "radial direction" refers to a direction parallel to a straight line perpendicular to and intersecting the central axis of the compressor, and the term "circumferential direction" refers to a direction perpendicular to the central axis of the compressor and perpendicular to the radius of the cross section.

[0066] In this specification, the terms "inner side", "outer side", "inward", "outward", "proximal side", "distal side" and the like are only used to illustrate the relative positions of the elements.

[0067] In this specification, the ordinal numbers "first", "second" and the like do not represent the order (for example, do not imply a chronological relationship, unless explicitly stated) or priority, importance, and the like, and the ordinal numbers are only used to represent that they are different from each other and independent of each other.

[0068] Figure 1 A cross-sectional view of a stator assembly according to the prior art is shown. In the prior art as shown in Figure 1 In the prior art, the stator assembly includes a front casing 1, a rear casing 3 and a stator vane sector 2 mounted between the front casing 1 and the rear casing 3. The front casing 1 and the rear casing 3 are integral ring structures. The front casing 1 includes a front recess 7, and the rear casing 3 includes a rear recess 8, which are respectively detachably matched with the front flange 5 and the rear flange 6 of the stator vane sector 2 to realize the mounting of the stator vane sector 2. Generally, the assembly sequence of the compressor is to first mount the rotor 4, assemble the multi-stage rotor into an integral body, then gradually mount the front casing 1, mount the front flange 5 of the stator vane sector 2 into the front recess 7 of the front casing 1, mount the rear flange 6 of the stator vane sector 2 into the rear recess 8 of the rear casing 3, and finally connect the front casing 1 and the rear casing 3 through casing fasteners 5 (for example, bolts 5) to complete the assembly. When disassembling, the rear casing 3 is first disassembled along the axial direction, then the stator vane sector 2 is disassembled, and finally the front casing 1 is disassembled, and so on, to disassemble the stator casing and the stator vanes. It should be noted that, Figure 1Only the installation structure diagram of the two-stage rotor 4 and the first-stage stator fan-shaped section 2 is shown. In reality, the rotor 4 and the stator fan-shaped section 2 have multiple stages both forward and backward, and their forms are similar to... Figure 1 same.

[0069] Figure 2 A cross-sectional view of a stator assembly 1000 according to an embodiment of the present invention is shown. Figure 2 The stator assembly 1000 shown includes a pre-stage casing 1001, a post-stage casing 1003, and a stator vane sector 1002 mounted between the pre-stage casing 1001 and the post-stage casing 1003. The stator vane sector 1002 includes a front flange 201 and a rear flange 202. The pre-stage casing 1001 includes a pre-stage recess 101, and the post-stage casing 1003 includes a post-stage recess 301. The front flange 201 is detachably engaged with the pre-stage recess 101, and the rear flange 202 is detachably engaged with the post-stage recess 301. The stator assembly 1000 also includes a front positioning member 102, which is fixed to the pre-stage housing 1001 by a front positioning fastener 106 and engages with the front flange 201 of the stator fan-shaped section 1002 to retain the front flange 201 in the pre-stage recess 101. The member is also capable of adjusting the clearance between the front flange 201 and the pre-stage recess 101, as will be described below. Figure 3 This will be further described. Preferably, the stator assembly 1000 also includes a front spacer 104 (e.g., a front gasket 104) disposed between the front positioning member 102 and the front stage housing 1001. By changing the thickness of the front spacer 104, the axial positioning of the front positioning member 102 can be adjusted, thereby adjusting the mating clearance between the front flange 201 and the front stage recess 101, as will be described below. Figure 3 This is described further. The preamplifier casing 1001 includes a preamplifier connecting flange 105, and the power amp casing 1003 includes a power amp connecting flange 305. The preamplifier connecting flange 105 and the power amp connecting flange 305 are connected by casing fasteners 1005 to secure the preamplifier casing 1001 and the power amp casing 1003 together. The casing fasteners 1005 are preferably bolts and nuts, but other suitable connection methods can also be used to secure the preamplifier casing 1001 and the power amp casing 1003 together.

[0070] More preferably, the stator assembly 1000 further includes a rear positioning member 302, which is fixed to the rear stage casing 1003 and mates with the rear flange 202 of the stator fan-shaped section 1002 to adjust the mating clearance between the rear flange 202 and the rear stage groove 301, as will be referred to below. Figure 4This will be further described. Preferably, the stator assembly 1000 also includes a rear spacer 304 (e.g., a rear gasket 304) disposed between the rear positioning member 302 and the rear stage housing 1003. By changing the thickness of the rear spacer 304, the axial positioning of the rear positioning member 302 can be adjusted, thereby adjusting the mating clearance between the rear flange 202 and the rear stage recess 301, as will be described below. Figure 4 This will be described further.

[0071] Figure 3 It shows Figure 2 The image shows a partially enlarged cross-sectional view of the stator assembly 1000 at the front flange 201 and the preamp recess 101. The front positioning member 102 includes a beveled section and a mounting section. The beveled section of the front positioning member 102 extends axially or substantially axially, with its proximal end relative to the preamp housing 1001 located within the preamp recess 101 and its distal end relative to the preamp housing 1001 located outside the preamp recess 101. The mounting section of the front positioning member 102 extends radially or substantially radially upward from the distal end of the beveled section. Preferably, the front positioning member 102 is secured to the preamp housing 1001 by a front positioning fastener 106, such as a screw 106, with mounting holes for the screw 106 provided on the mounting section of the front positioning member 102 and the preamp housing 1001. However, it can also be secured to the preamp housing 1001 by other connection methods.

[0072] Preferably, a front inclined surface 203 is provided on the upper surface of the front flange 201. The front inclined surface 203 on the front flange 201 extends inward and downward relative to the stationary blade fan-shaped section 1002. In other words, the outer side of the front inclined surface 203 relative to the stationary blade fan-shaped section 1002 is higher than the inner side of the stationary blade fan-shaped section 1002. Preferably, a front positioning inclined surface 103 is provided on the lower surface of the inclined section of the front positioning member 102. The front positioning inclined surface 103 extends downward in the axial direction toward the stationary blade fan-shaped section 1002. In other words, the proximal side of the front stage housing 1001 is higher than the distal side of the proximal housing 1. Preferably, the outer edge of the upper surface of the front stage groove 1 is chamfered as shown in the figure to facilitate assembly.

[0073] With this construction, the front inclined surface 203 of the front flange 201 engages with the front positioning inclined surface 103 of the front positioning member 102. This inclined surface engagement holds the front flange 201 within the front stage groove 101, preventing the front flange 201 from dislodging from the front stage groove 101 during disassembly due to the movement of the subsequent stage casing 1003. This avoids the stator fan-shaped section 1002 moving with the subsequent stage casing during disassembly. Preferably, the angle between the front inclined surface 203 and the axial direction is between 5° and 45°. Correspondingly, the angle between the front positioning inclined surface 103 and the axial direction is between 5° and 45°.

[0074] In addition, due to the slope matching, the positioning of the front flange 201 can be adjusted by adjusting the size or angle of the slope, or by adjusting the radial size of the front positioning member 102, or by adjusting the thickness of the front spacer 104 between the front positioning member 102 and the front stage casing 1001, so as to adjust the matching gap between the front flange 201 and the front stage groove 101.

[0075] Preferably, for the front stage casing 1001 of the whole ring structure, the front positioning member 102 is a single ring-shaped member matching the whole ring structure of the front stage casing 1001 in size, and the corresponding front spacer 104 is also a single ring-shaped member matching the whole ring structure of the front stage casing 1001 in size, which makes the whole stator assembly 1000 more compact and more convenient to disassemble and assemble.

[0076] Alternatively, the front positioning member 102 is one or more arc-shaped members matching the corresponding stator vane sector 1002 in size, and the corresponding front spacer 104 is also one or more arc-shaped members matching the corresponding stator vane sector 1002 in size. That is, in this alternative embodiment, the front positioning member 102 and the front spacer 104 are segmented structures in the corresponding circumferential direction of the stator vane sector 1002, and different combinations of the front positioning member 102, the stator vane sector 1002 and the front spacer 104 can be adjusted or disassembled individually, for example, a first combination of the front positioning member 102, the stator vane sector 1002 and the front spacer 104 can be adjusted or disassembled individually without affecting other combinations such as a second combination of the front positioning member 102, the stator vane sector 1002 and the front spacer 104, which makes the installation and adjustment of the stator assembly 1000 more flexible. Alternatively, the front positioning member 102 and / or the front spacer 104 can correspond to one or more stator vane sectors 1002.

[0077] Figure 4 A partial enlarged sectional view of the stator assembly 1000 in the rear flange 202 and the rear stage groove 301 is shown in FIG. 6. Figure 2 The rear positioning member 302 includes a slope section and a mounting section. The slope section of the rear positioning member 302 extends in the axial direction or substantially in the axial direction, and is located inside the rear stage groove 301 relative to the proximal end of the rear stage casing 1003, and is located outside the rear stage groove 301 relative to the distal end of the rear stage casing 1003. The mounting section of the rear positioning member 102 extends upward in the radial direction or substantially in the radial direction from the distal end of the slope section. Preferably, the rear positioning member 302 is fixed to the rear stage casing 1003 by rear positioning fasteners 306, such as by screws 306, and mounting holes for the screws 306 are provided on the mounting section of the rear positioning member 302 and the rear stage casing 1003, but other connection methods can also be used to fix the rear positioning member 302 to the rear stage casing 1003.

[0078] Preferably, the rear flange 202 is provided with a rear inclined surface 204 on the upper surface of the rear flange 202, the rear inclined surface 204 on the rear flange 202 extends upwardly and inwardly relative to the stator segment 1002, in other words, the rear inclined surface 204 is higher relative to the inner side of the stator segment 1002 than relative to the outer side of the stator segment 1002. Preferably, the rear positioning inclined surface 303 is provided on the lower surface of the inclined surface section of the rear positioning member 302, the rear positioning inclined surface 303 extends upwardly and inwardly relative to the rear casing 1003 in the axial direction, in other words, the rear positioning inclined surface 303 is higher relative to the far side of the rear casing 1003 than relative to the near side of the near casing 3. Preferably, the outer edge of the upper surface of the rear casing 3 is provided with a chamfer as shown in the figure, which facilitates assembly.

[0079] Through such a configuration, the rear inclined surface 204 of the rear flange 202 cooperates with the rear positioning inclined surface 303 of the rear positioning member 302, due to the cooperation of the inclined surfaces, the positioning of the rear flange 202 can be adjusted by designing the size or angle of the inclined surface, or by adjusting the radial size of the rear positioning member 302, or by adjusting the thickness of the rear spacer 304 between the rear positioning member 302 and the rear casing 1003, thereby adjusting the cooperation gap between the rear flange 202 and the rear casing 3. In addition, through the cooperation of the inclined surfaces between the rear inclined surface 204 and the rear positioning inclined surface 303, it can also reduce the difficulty of the stator segment 1002 to be separated from the rear casing 1003 due to the slight deformation of the rear flange 202 and the rear casing 3, and even if the rear flange 202 and the rear casing 3 are difficult to separate, by removing the rear positioning member 302, it is also helpful to disassemble the stator segment 1002 and the rear casing 3. Preferably, the angle between the rear inclined surface 204 and the axial direction is between 5 to 45°. Correspondingly, the angle between the rear positioning inclined surface 303 and the axial direction is between 5 to 45°.

[0080] Preferably, for the rear casing 1003 of the whole ring structure, the rear positioning member 302 is a single annular member with a size matched with the whole ring structure of the rear casing 1003, and the corresponding rear spacer 304 is also a single annular member with a size matched with the whole ring structure of the rear casing 1003, which makes the stator assembly 1000 more compact as a whole and more convenient to disassemble and assemble.

[0081] Alternatively, the rear positioning member 302 is one or more arc-shaped members sized to fit the corresponding vane segment 1002, and the corresponding rear spacer member 304 is also one or more arc-shaped members sized to fit the corresponding vane segment 1002. That is, in this alternative embodiment, the rear positioning member 302 and the rear spacer member 304 are segmented structures in the circumferential direction corresponding to the vane segment 1002, and different combinations of the rear positioning member 302, the vane segment 1002, and the rear spacer member 304 can be adjusted or disassembled individually, for example, a first combination of the rear positioning member 302, the vane segment 1002, and the rear spacer member 304 can be adjusted or disassembled individually without affecting a second combination of the rear positioning member 302, the vane segment 1002, and the rear spacer member 304, and so on, which makes the installation and adjustment of the stator assembly 1000 more flexible. Alternatively, the rear positioning member 302 and / or the rear spacer member 304 can correspond to one or more vane segments 1002.

[0082] The assembly method of the stator assembly 1000 according to the preferred embodiment of the present application will be described below with reference to the accompanying drawings. Figure 2

[0083] First, the front flange 201 of the vane segment 1002 is installed into the front recess 101 of the front casing 1001, and then the front spacer member 104 and the front positioning member 102 are installed to the front casing 1001 by screws 106, and the fit clearance between the front flange 201 and the front recess 101 is adjusted by adjusting the thickness of the front spacer member 104 (for example, by replacement or additive / subtractive manufacturing). Next, the rear spacer member 304 and the rear positioning member 302 are installed to the rear casing 1003 by screws 306, and then the rear flange 202 of the vane segment 1002 is installed into the rear recess 301 of the rear casing 1003, and the fit clearance between the rear flange 301 and the rear recess 301 is adjusted by adjusting the thickness of the rear spacer member 304 (for example, by replacement or additive / subtractive manufacturing). Finally, the front casing 1001 and the rear casing 1003 are connected together by the bolt-nut fastener 1005, thereby completing the assembly of the stator assembly 1000.

[0084] The disassembly method is the reverse of the assembly method steps. When the rear flange 202 is separated from the rear recess 301, and the vane segment 1002 moves axially with the rear casing 1003, the front positioning slope 103 of the front positioning member 102 will block the front slope 203 of the front flange 201, forming an axial stop effect, thereby facilitating the disengagement of the rear flange 202 from the rear recess 301.

[0085] ​In this document, the terms "comprise", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without limitation, an element preceded by "comprises... a" does not, without more limitations, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0086] The description of the application is given for the sake of exemplification and is not intended to limit the application to the specific forms set forth. Many modifications and variations are possible that will be apparent to those skilled in the art. The embodiments are chosen and described in order to best explain the principles of the application and its practical application and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A stator assembly, the stator assembly comprising a stator housing and a stator vane fan-shaped segment mounted on the stator housing, the stator housing comprising a pre-stage housing and a post-stage housing, the pre-stage housing comprising a pre-stage recess, the post-stage housing comprising a post-stage recess, the stator vane fan-shaped segment comprising a front flange and a rear flange, the front flange being detachably engaged with the pre-stage recess, and the rear flange being detachably engaged with the post-stage recess. Its features are, The stator assembly also includes a front positioning member, which is fixed to the front stage housing and engages with the front flange to retain the front flange in the front stage recess.

2. The stator assembly according to claim 1, characterized in that, The front flange is provided with a front inclined surface, and the front positioning member is provided with a front positioning inclined surface, the front positioning inclined surface cooperating with the front inclined surface of the front flange.

3. The stator assembly according to claim 2, characterized in that, The stator assembly also includes a front spacer, which is arranged between the front positioning member and the front stage casing to adjust the mating clearance between the stator fan-shaped section and the front stage casing.

4. The stator assembly according to claim 3, characterized in that, The stator assembly also includes a rear positioning member, which is fixed to the rear stage housing and engages with the rear flange to adjust the positioning of the rear flange.

5. The stator assembly according to claim 4, characterized in that, The rear flange is provided with a rear inclined surface, and the rear positioning member is provided with a rear positioning inclined surface. The rear positioning inclined surface cooperates with the rear inclined surface of the rear flange to adjust the positioning of the rear flange.

6. The stator assembly according to claim 5, characterized in that, The stator assembly also includes a rear spacer, which is arranged between the rear positioning member and the rear stage casing to adjust the mating clearance between the stator fan-shaped section and the rear stage casing.

7. The stator assembly according to claim 6, characterized in that, The front positioning member and / or the rear positioning member are single ring-shaped members, and the corresponding front spacer and / or the rear spacer are single ring-shaped members.

8. The stator assembly according to claim 6, characterized in that, The front positioning member and / or the rear positioning member are one or more arc-shaped members for cooperating with the corresponding stationary blade fan-shaped segment, and the corresponding front spacer and / or the rear spacer are one or more arc-shaped spacers.

9. The stator assembly according to any one of claims 1 to 8, characterized in that, The preamplifier housing includes a preamplifier connecting flange, and the cassette housing includes a cassette connecting flange, wherein the preamplifier connecting flange and the cassette connecting flange are connected by housing fasteners to secure the preamplifier housing and the cassette housing together.

10. A compressor comprising a stator assembly according to any one of claims 1 to 9.

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