An axial flow compressor stator blade grinding and fixing device and an axial flow compressor

Abstract

The present application provides an axial compressor stator blade grinding fixing device and an axial compressor, belonging to the technical field of axial compressors. The fixing device is arranged along the side wall of the casing. The fixing device includes sector-shaped thin sheet structures respectively arranged at the front end and the rear end of the stator blade. The sector-shaped thin sheet structures are provided with a plurality of fixing holes for installing fixing components along the circumferential direction. The fixing holes on the sector-shaped thin sheet structure at the front end of the stator blade and the fixing holes on the sector-shaped thin sheet structure at the rear end of the stator blade are arranged oppositely, and the fixing components pass through the oppositely arranged fixing holes for fixing. Through the processing solution of the present application, the damage to the blades is reduced, the operation is convenient and fast, and it is easy to remove after grinding.

Description

Technical Field

[0001] The present application relates to the technical field of axial compressors, and particularly to a fixing device for grinding the stator blades of an axial compressor and an axial compressor. Background Art

[0002] In order to ensure a small radial clearance between the rotor and the stator in a multi-stage axial compressor, combined tip grinding is usually carried out. When the rotor tip is ground at high speed, the blades can usually be kept in a tensioned state by centrifugal force, so there is no need to fix the rotor blades additionally before grinding. When the stator is ground in combination, usually the casing rotates at a relatively low speed, and the tip of each blade is ground one by one by a high-speed rotating grinding wheel. Therefore, the stator blades need to be fixed before grinding. In the prior art, the blades are usually fixed by wax injection or pouring other low-melting-point metals before grinding. After grinding, the wax needs to be melted and the parts need to be cleaned. The process is cumbersome. Since the whole casing assembly needs to be heated during pouring and melting, it is easy to damage the surface state of the blades and even cause local deformation. Because of the high precision requirements for the compressors of aeroengines or gas turbines, this method has a great impact on the precision. Summary of the Invention

[0003] In view of this, the embodiments of the present application provide a fixing device for grinding the stator blades of an axial compressor and an axial compressor, which at least partially solve the problem that the method of fixing the blades in the prior art has a great impact on the precision of the compressor.

[0004] In a first aspect, the embodiments of the present application provide a fixing device for grinding the stator blades of an axial compressor. The fixing device is arranged along the side wall of the casing. The fixing device includes sector-shaped thin sheet structures respectively arranged at the front end and the rear end of the stator blade. The sector-shaped thin sheet structures are provided with a plurality of fixing holes for installing fixing components along the circumferential direction. The fixing holes on the sector-shaped thin sheet structure at the front end of the stator blade and the fixing holes on the sector-shaped thin sheet structure at the rear end of the stator blade are arranged oppositely, and the fixing components pass through the oppositely arranged fixing holes for fixing.

[0005] According to a specific implementation manner of the embodiments of the present application, the sector-shaped thin sheet structure is arranged as a double-layer structure, and the double-layer structure includes a hard plastic layer and a rubber layer, and the rubber layer is in contact with the stator blade.

[0006] According to a specific implementation manner of the embodiments of the present application, the hard plastic layer and the rubber layer are bonded by strong glue.

[0007] According to a specific implementation manner of the embodiments of the present application, the total thickness of the double-layer structure is 10 - 15 mm.

[0008] According to a specific implementation manner of the embodiments of the present application, the plurality of fixing holes are uniformly arranged, and the number of the fixing holes is more than 3.

[0009] In a specific implementation manner according to an embodiment of the present application, the inner diameter of the fan-shaped thin sheet structure is 5-10 mm larger than the radius of the tip of the stator blade, and the difference between the outer diameter and the inner diameter of the fan-shaped thin sheet structure is 1 / 3-1 / 2 of the total length of the stator blade.

[0010] In a specific implementation manner according to an embodiment of the present application, the fixing component includes bolts or cable ties.

[0011] In a second aspect, an embodiment of the present application further provides an axial flow compressor, which uses the axial flow compressor stator blade grinding and fixing device described in any embodiment of the first aspect to fix the stator blade. The fan-shaped thin sheet structures respectively arranged at the front end and the rear end of the stator blade are a set of fixing devices, and multiple sets of fixing devices are uniformly arranged along the circumferential direction in the casing.

[0012] In a specific implementation manner according to an embodiment of the present application, 4-6 sets of fixing devices are uniformly arranged along the circumferential direction in the casing.

[0013] Beneficial effects

[0014] In the axial flow compressor stator blade grinding and fixing device and the axial flow compressor in the embodiment of the present application, by setting the fan-shaped thin sheet structure to clamp and fix the stator blade, it is not necessary to heat the casing assembly, the surface state of the blade will not be damaged, the damage to the blade is small, and the operation is convenient and fast, and it is easy to remove after grinding. Description of the drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is an assembly drawing of an axial flow compressor stator blade grinding and fixing device according to an embodiment of the present invention;

[0017] Figure 2 It is an assembly drawing of a blade tenon and a casing tenon groove according to an embodiment of the present invention;

[0018] Figure 3 It is a three-dimensional view of an axial flow compressor stator blade grinding and fixing device according to an embodiment of the present invention;

[0019] Figure 4 It is a cross-sectional view of an axial flow compressor stator blade grinding and fixing device according to an embodiment of the present invention.

[0020] In the figure: 1. Casing; 2. Fixing device; 2-1. Hard plastic layer; 2-2. Rubber layer; 3. Stator blade; 3-1. Stator blade tenon; 3-2. Stator blade body. Detailed implementation manners

[0021] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0022] The following uses specific specific examples to illustrate the implementation manners of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0023] It should be noted that the following describes various aspects of the embodiments within the scope of the appended claims. It should be obvious that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is illustrative only. Based on the present application, those skilled in the art should understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, this device and / or this method can be implemented using other structures and / or functions in addition to one or more of the aspects described herein.

[0024] It should also be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present application schematically. The drawings only show the components related to the present application, rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in its actual implementation can be an arbitrary change, and the component layout type may also be more complex.

[0025] In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0026] In a first aspect, an axial compressor stator blade grinding fixing device is provided in an embodiment of the present application. The following will be described in detail with reference to Figures 1 to 4 for detailed description.

[0027] Refer to Figure 1, in this embodiment, a typical axial compressor casing 1 is given. It is a metal thin-walled structure and is a split and split structure, as Figure 1 shown. The stator blade T-shaped tenon grooves are installed on the casing 1, and the assembly relationship between the stator blade tenon 3-1 and the casing tenon groove is as Figure 2 shown. The stator blades 3 of the compressor are usually integrally machined from metal forgings and are installed in the holes or grooves on the casing 1. The stator blades 3 include stator blade tenons 3-1 and stator blade bodies 3-2. In order to prevent the casing 1 and the blades from thermally expanding and contracting during engine operation, the connection between the stator blades 3 and the casing 1 adopts a clearance fit. There is usually a radial clearance of about 0.1 mm between the tenon groove on the casing 1 and the stator blade tenon 3-1 ( Figure 2 in Figure 2 , the R direction is the radial direction), and an axial clearance of about 0.1 mm on one side ( Figure 2 in Figure 2 , the X direction is the axial direction). After installation, the stator blades 3 can swing relative to the casing 1. Before the combined grinding of the compressor stator blades, the stator blades 3 must be fixed first so that they cannot swing during grinding. Before grinding the blade tips, the stator blades 3 are fixed with the compressor stator blade fixing device 2.

[0028] In one embodiment, the fixing device 2 is arranged along the side wall of the casing 1. The fixing device 2 includes sector-shaped thin sheet structures respectively arranged at the front end and the rear end of the stator blade 3. The sector-shaped thin sheet structures are provided with a plurality of fixing holes for installing fixing components along the circumferential direction. The fixing holes on the sector-shaped thin sheet structure at the front end of the stator blade 3 and the fixing holes on the sector-shaped thin sheet structure at the rear end of the stator blade 3 are arranged oppositely, and the fixing components pass through the oppositely arranged fixing holes for fixing. In this embodiment, the fixing components include bolts or cable ties. For example, when using a cable tie for fixing, only need to pass the cable tie into the fixing holes of the oppositely arranged sector-shaped thin sheet structures, tighten the two sector-shaped thin sheet structures, and the radial and axial positions of the blade can be fixed; after grinding is completed, only need to cut off the cable tie, and the fixing device 2 can be removed.

[0029] More specifically, referring to Figures 3 - 4 , the sector-shaped thin sheet structure is arranged as a double-layer structure. The double-layer structure includes a rigid plastic layer 2-1 and a rubber layer 2-2, and the rubber layer 2-2 contacts the stator blade 3. The rigid plastic layer 2-1 and the rubber layer 2-2 are bonded by strong glue, and the total thickness of the double-layer structure is 10-15 mm.

[0030] Preferably, the total thickness of the double-layer structure is 10 mm.

[0031] In one embodiment, a plurality of fixing holes are evenly arranged along the circumferential direction at the middle radius of the fixing device 2, and the diameters of the fixing holes are equal, and the number of fixing holes is greater than 3.

[0032] Further, the inner diameter r of the sector-shaped thin sheet structure is 5-10 mm larger than the tip radius of the stator blade, and the difference between the outer diameter R and the inner diameter r of the sector-shaped thin sheet structure is 1 / 3-1 / 2 of the total length of the stator blade.

[0033] In a second aspect, an embodiment of the present application further provides an axial flow compressor. The stator blades are fixed by using the stator blade grinding and fixing device according to any embodiment of the first aspect. The sector-shaped thin sheet structures respectively arranged at the front end and the rear end of the stator blade 3 are a set of fixing devices 2, and multiple sets of fixing devices 2 are uniformly arranged along the circumferential direction in the casing 1.

[0034] Preferably, 4-6 sets of fixing devices 2 are uniformly arranged along the circumferential direction in the casing 1.

[0035] In one embodiment, referring to Figure 4 , it is a cross-sectional view of the fixing device 2. The parameter α is the sector angle, which depends on the number N of the fixing devices 2 in one circle of the casing 1, that is, α = 360 / N. Preferably, 4 sets of fixing devices 2 are used for one circle of blades, that is, α = 90°.

[0036] During specific operation, assuming that the sector angle of the selected fixing device 2 is 90°, a total of 4 sets of fixing devices are required for the first-stage blades. One sector-shaped thin sheet structure in a set of fixing devices 2 is placed at the front end of the blade, and the other sector-shaped thin sheet structure is placed at the rear end of the blade (the front-rear direction refers to the X direction in Figure 2 ). The rubber layer 2-2 side of the fixing device 2 faces the blade. Then, appropriately adjust the circumferential position of the fixing device 2 so that the number of blades it covers is close to 1 / 4. Then, adjust the radial position of the fixing device 2 so that the exposed length of the blade tip is about 5-10 mm. Then, pass a plastic tie through the fixing holes at the same position of a set of fixing devices 2 and tighten the two sector-shaped thin sheet structures to fix the radial and axial positions of the blade. Use the same method to fix the remaining blades of this stage of stator blades. After grinding is completed, only need to cut off the tie to remove the fixing device 2.

[0037] For compressors with more stages, the same set of fixing devices 2 can be used for adjacent 2-3 stages, so as to save the processing and preparation quantity.

[0038] Compared with the existing stator blade fixing method, this stator blade fixing device has little damage to the blade, is convenient and fast, and is easy to remove after grinding, etc.

[0039] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An axial flow compressor stator blade grinding and fixing device, characterized in that The stator blade T-slot is installed on the casing of the axial compressor. The stator vane includes a stator vane tenon and a stator vane body. The stator vane tenon is assembled with the T-slot and adopts a clearance fit. The fixing device fixes the stator vane. The fixing device is arranged along the side wall of the casing. The fixing device includes sector-shaped thin sheet structures respectively arranged at the front end and the rear end of the stator vane. The sector-shaped thin sheet structure is provided with a plurality of fixing holes for installing fixing components along the circumferential direction. The fixing component includes a cable tie. The fixing holes on the sector-shaped thin sheet structure at the front end of the stator vane and the fixing holes on the sector-shaped thin sheet structure at the rear end of the stator vane are arranged oppositely. Before grinding the blade tip, the fixing component passes through the oppositely arranged fixing holes to fix the position of the blade radially and axially. After grinding is completed, the fixing device is removed; The sector-shaped thin sheet structure is arranged as a double-layer structure. The double-layer structure includes a rigid plastic layer and a rubber layer. The rubber layer contacts the stator vane.

2. The axial compressor stator blade grinding and fixing device according to claim 1, wherein The rigid plastic layer and the rubber layer are bonded by strong glue.

3. The axial compressor stator blade grinding and fixing device according to claim 1, characterized in that, The total thickness of the double-layer structure is 10 - 15 mm.

4. The axial flow compressor stator blade grinding and fixing device according to claim 1, wherein The plurality of fixing holes are uniformly arranged, and the number of the fixing holes is more than 3.

5. The axial flow compressor stator blade grinding and fixing device according to claim 1, characterized in that, The inner diameter of the sector-shaped thin sheet structure is 5 - 10 mm larger than the radius of the stator vane tip, and the difference between the outer diameter and the inner diameter of the sector-shaped thin sheet structure is 1 / 3 - 1 / 2 of the total length of the stator vane.

6. An axial compressor, wherein the stator blades are fixed by using the axial compressor stator blade grinding and fixing device according to any one of claims 1-5, characterized in that, The sector-shaped thin sheet structures respectively arranged at the front end and the rear end of the stator vane are a set of fixing devices, and multiple sets of fixing devices are uniformly arranged along the circumferential direction in the casing.

7. The axial compressor stator blade grinding and fixing device according to claim 6, characterized in that, 4 - 6 sets of fixing devices are uniformly arranged along the circumferential direction in the casing.

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