A method for controlling the tip size of adjustable stationary blades of a compressor

Abstract

The present invention discloses a method for controlling the size of an adjustable stator blade tip of a compressor in the field of adjustable stator blade tip clearance control. The present invention uses a process component of an inner sleeve, a rocker arm, a self-locking nut and a linkage ring to assemble the adjustable stator blade to a compressor casing during grinding, thereby realizing the grinding of the adjustable stator blade in a combined state, separating the grinding process of the adjustable stator blade tip from the traditional assembly procedure, making the processing flow of the adjustable stator blade simpler and more reasonable. At the same time, the process component of the inner sleeve is made of rigid material and can be tightened without deformation, thereby ensuring the grinding accuracy. During the grinding process, the process component of the inner sleeve can also resist the grinding cutting force, thereby ensuring the stability of the adjustable stator blade during the grinding process of the adjustable stator blade tip, thereby further improving the grinding accuracy when the adjustable stator blade tip is ground. At the same time, during assembly, all adjustable stator blades are installed in a unified method to ensure the uniformity of the adjustable stator blade tip clearance.

Description

Technical Field

[0001] The invention relates to the field of adjustable stator blade tip clearance control, and in particular to a method for controlling the size of adjustable stator blade tips of a compressor. Background Art

[0002] Due to the high speed and small rotor-stator clearance (about 0.5mm) of small and medium-sized aircraft engines, the design and guarantee of the rotor-stator clearance is crucial to the safety of the engine. In the design of small and medium-sized aircraft engine compressors, the stator blade tips are usually ground when they are assembled on the casing to control the size of the adjustable stator blade tips, so that the profile of the entire circle of stator blade tips relative to the casing reference is less than 0.05mm and the runout is less than 0.03mm, so as to eliminate the uneven and possibly small gap between the stator blade tip and the rotor after the stator blade is assembled due to the machining tolerance of the parts and the clearance of the parts.

[0003] The existing grinding method is to carry out the combined grinding of blade tips within the general assembly process of the engine. For example, the Chinese invention patent with the authorization announcement number CN105290422B discloses a method for processing adjustable stator blades. After the engine starts to be assembled, the assembly workshop assembles the adjustable stator blades on the compressor casing through other assembly parts, adjusts the angle of the adjustable stator blades to the design angle (the angle of the combined grinding of the adjustable stator blades), and then tightens the adjustable stator blades with a certain torque. The entire assembly is then transferred to the machining workshop, and the machining workshop grinds the tips of the adjustable stator blades. After the grinding is completed, the parts are returned to the assembly workshop to continue the engine assembly.

[0004] At the same time, since the adjustable stator blades need to be frequently rotated to adjust the blade angle during the operation of the engine, the inner sleeves used for the adjustable stator blades are usually made of wear-resistant materials such as polytetrafluoroethylene. Compared with metal inner sleeves, plastic inner sleeves have good wear resistance, small friction coefficient and good sealing performance. They are preferably used when the operating environment temperature does not exceed 200°C. Metal inner sleeves are only used when the operating environment exceeds 200°C (such as the adjustable stator blades at the compressor inlet, which need to introduce high-temperature gas for anti-icing). However, plastic inner sleeves are prone to deformation when subjected to force, and when the adjustable stator blade tip is combined and ground, the self-locking nut for the stator blade installation needs to be tightened with a certain torque. After the grinding is completed, the self-locking nut needs to be loosened by a certain angle so that the adjustable stator blade can be flexibly rotated on the casing without swinging. Due to these characteristics of the adjustable stator blades, many problems arise when the existing technical solutions are used to grind the adjustable stator blade tips;

[0005] 1. When assembling the adjustable stator blades and casing components, the parts used are all real engine parts. The assembly and grinding processing must be carried out in the engine general assembly process. The adjustable stator blades need to be assembled on the compressor casing in the assembly workshop and then transferred to the machining workshop for grinding. The assembly work is completed by the assembly workshop and the grinding work is completed by the machining workshop, which prolongs the time of engine general assembly;

[0006] 2. When the inner sleeve is made of plastic, when the plastic inner sleeve is assembled for blade tip grinding, under the action of the tightening torque of the adjustable stator blade and the grinding cutting force, the sleeve is compressed and deformed elastically and plastically, resulting in size deviation, and the blade tip margin reserved for the adjustable stator blade cannot be effectively removed. After the blade tip is ground, the self-locking nut for the stator blade is loosened to a certain angle, and the blade tip height dispersion is large, and the blade swing is large;

[0007] 3. When the inner sleeve is made of plastic, the rigidity of the plastic material is low, and the thickness of the plastic inner sleeve is prone to plastic deformation during the grinding process of the adjustable stator blade tip, such as Figure 4 As shown, the height dimension L3 of the tip of the adjustable stator blade after grinding is jointly affected by the thickness dimension L1 of the inner sleeve, the height dimension L2 of the adjustable stator blade body and the height dimension L4 of the adjustable stator blade mounting hole on the compressor casing. Therefore, the adjustable stator blade after grinding needs to be used in conjunction with the compressor casing and the inner sleeve during grinding. The installation position of the three is not allowed to be changed. If the inner sleeve needs to be replaced after being worn, the adjustable stator blade needs to be re-grinded, and the maintenance cost is relatively high.

[0008] Based on this, the present invention designs a method for controlling the tip size of an adjustable stator blade of a compressor to solve the above-mentioned problem. Summary of the invention

[0009] To achieve the above object, the present invention provides the following technical solution: a method for controlling the tip size of an adjustable stator blade of a compressor, characterized in that it comprises the following steps:

[0010] S1, production of process parts for assembling adjustable stator blades to compressor casing, including process parts of inner bushing, rocker arm, self-locking nut and linkage ring, the size of which is consistent with the real parts, among which, the process parts of inner bushing are made of rigid materials to prevent deformation of the process parts of inner bushing during assembly and grinding of adjustable stator blades, and the manufacturing materials of rocker arm, self-locking nut and linkage ring are consistent with the corresponding real parts;

[0011] S2, the processing workshop produces the compressor casing and the adjustable stator blades. The adjustable stator blades are assembled to the compressor casing in the processing workshop through the process parts of the inner bushing, the rocker arm, the self-locking nut and the linkage ring. After the adjustable stator blades are adjusted to the processing angle, the process parts of the self-locking nut are tightened to lock the adjustable stator blades.

[0012] S3, wax filling is performed on the adjustable stator blades to fix them, so that the entire circle of the adjustable stator blades is wrapped in wax;

[0013] S4, grinding the blade tip of the adjustable stator blade in a processing workshop so that the blade tip size of the adjustable stator blade meets the design requirements and the meridian flow channel line of the blade tip of the adjustable stator blade is a straight line;

[0014] S5, waxing the adjustable stator blades, recording the installation hole positions of the adjustable stator blades on the compressor casing, so as to determine the installation hole position of each adjustable stator blade on the compressor casing during the grinding process, and removing the process parts to separate the adjustable stator blades from the compressor casing into a single-piece state;

[0015] S6, the processed adjustable stator blades and compressor casing are put into storage as an assembly, and the inner bushing, rocker arm, self-locking nut and linkage ring are kept in the processing workshop for repeated use;

[0016] S7, during the final assembly of the engine, the assembly workshop receives the assembly of the adjustable stator blades and the compressor casing and assembles them with the remaining parts. When assembling the adjustable stator blades, the adjustable stator blades are installed according to the installation hole positions recorded in step S5, and all adjustable stator blades are assembled using a consistent method.

[0017] As a further solution of the present invention, in step S1, the tolerance of the thickness dimension L1 of the inner liner process piece during processing is smaller than the tolerance of the thickness dimension L1 of the inner liner real part.

[0018] As a further solution of the present invention, in step S2, after the adjustable stationary blades are assembled on the compressor casing, the process parts of the self-locking nuts are tightened with a torque of 5-5.5 N·m.

[0019] As a further solution of the present invention, in step S2, before tightening the self-locking nut, the process part of the linkage ring is rotated to drive the adjustable stator blade to rotate, and the cylindrical pin is inserted into the process part of the linkage ring and the positioning hole provided in the compressor casing to make the adjustable stator blade be located at the processing angle.

[0020] As a further solution of the present invention, in step S5, when recording the installation hole positions of the adjustable stator blades on the compressor casing, the installation holes of the adjustable stator blades on the casing are numbered according to the circumferential position distribution based on the compressor casing design drawing, and the batch number of the adjustable stator blade parts installed in each numbered installation hole position is recorded to form an adjustable stator blade installation position file.

[0021] As a further solution of the present invention, in step S7, when the adjustable stationary blades are assembled on the compressor casing, the assembly method is as follows:

[0022] S71, the adjustable stator blade is assembled to the compressor casing through the real parts of the inner bushing, rocker arm, self-locking nut and linkage ring. When tightening the self-locking nut, the tightening torque of the self-locking nut is 2-2.2N·m;

[0023] S72, the self-locking nut is rotated back 30-45°;

[0024] S73, use a flexible tool to tap the journal of the adjustable stator blade inward along the radial direction to observe whether the adjustable stator blade swings;

[0025] S74, if the adjustable stator blades swing obviously, tighten the self-locking nuts by 1-20°, and then repeat step S73 until the adjustable stator blades stop swinging.

[0026] The present invention has the following beneficial effects:

[0027] 1. The present invention uses the process parts of the inner liner, the rocker arm, the self-locking nut and the linkage ring to assemble the adjustable stator blade to the compressor casing during the grinding of the adjustable stator blade. While realizing the grinding of the adjustable stator blade in the assembled state, the grinding process of the blade tip of the adjustable stator blade is separated from the traditional assembly procedure. The adjustable stator blade can be ground after the production of the adjustable stator blade and the compressor casing is completed, without waiting for the remaining assembly parts to be put into the warehouse and then re-assembled. The processing flow of the adjustable stator blade is simpler and more reasonable. The adjusted stator blade and the compressor casing that have been ground are put into the warehouse as an assembly. In the subsequent engine assembly process, the engine assembly can be completed directly in the assembly workshop, without the need to assemble the adjustable stator blade to the compressor casing and then transport it to the machining workshop for processing. The assembly process is simplified and the assembly process time is shortened.

[0028] 2. Since the inner sleeve process parts are only used for temporary assembly of adjustable stator blades during grinding of adjustable stator blades, there is no need to consider the wear resistance, friction coefficient and sealing of the inner sleeve process parts. Therefore, the inner sleeve process parts can be made of rigid materials. The inner sleeve process parts made of rigid materials will not be deformed when tightening the self-locking nut. At the same time, during the grinding process, the inner sleeve process parts can also resist the grinding cutting force, ensuring that the inner sleeve process parts will not be deformed during assembly and grinding, ensuring the stability of the adjustable stator blade during the grinding process of the adjustable stator blade tip, thereby further improving the grinding accuracy when grinding the adjustable stator blade tip.

[0029] 3. Since the inner sleeve process parts are made of rigid materials, the processing accuracy of the inner sleeve process parts is easier to ensure than that of the real parts. By improving the tolerance grade of the inner sleeve process parts, after the adjustable stator blades completed by grinding the rigid inner sleeve process parts are installed in the assembly workshop, although the height dimension tolerance of the blade tip includes the cumulative sum of the thickness dimension tolerance of the inner sleeve process parts and the thickness dimension tolerance of the real inner sleeve parts, it can still meet the design requirements. Therefore, the adjustable stator blades after grinding are only required to be used in pair with the compressor casing, and no longer need to be used in conjunction with the inner sleeve. If the inner sleeve needs to be replaced after wear, there is no need to grind the tip of the adjustable stator blade again, which can greatly save maintenance costs and improve maintainability.

[0030] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 Schematic diagram of the process of this method.

[0033] Figure 2 It is a schematic diagram of the structure of the adjustable stationary blades after assembly in the present invention.

[0034] Figure 3 It is a schematic diagram of the cross-sectional structure of the adjustable stationary blades after assembly in the present invention.

[0035] Figure 4 It is a schematic diagram of the relationship between the thickness dimension of the inner sleeve and the tip height dimension of the adjustable stationary blade in the present invention.

[0036] Legend:

[0037] 1. Inner bushing; 2. Rocker arm; 3. Self-locking nut; 4. Linkage ring; 5. Compressor casing; 6. Adjustable stator blades. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0039] See also Figure 1-4 The present invention provides a method for controlling the tip size of an adjustable stator blade of a compressor, comprising the following steps:

[0040] S1, producing the process parts for assembling the adjustable stator blade 6 to the compressor casing 5, including the process parts of the inner bushing 1, the rocker arm 2, the self-locking nut 3 and the linkage ring 4, the size of the process parts is consistent with the real parts, wherein the process parts of the inner bushing 1 are made of rigid materials to prevent the process parts of the inner bushing 1 from being deformed during the assembly and grinding of the adjustable stator blade 6, and the manufacturing materials of the process parts of the rocker arm 2, the self-locking nut 3 and the linkage ring 4 are consistent with the corresponding real parts;

[0041] S2, the processing workshop produces the compressor casing 5 and the adjustable stator blade 6, assembles the adjustable stator blade 6 to the compressor casing 5 through the process parts of the inner bushing 1, the rocker arm 2, the self-locking nut 3 and the linkage ring 4 in the processing workshop, and tightens the process parts of the self-locking nut 3 to lock the adjustable stator blade 6 after adjusting the adjustable stator blade 6 to the processing angle, such as Figure 2-3 As shown, the linkage ring 4 is sleeved on the outer wall of the compressor casing 5 and is coaxially arranged with the compressor casing 5. A plurality of rocker arms 2 are rotatably arranged on one side of the linkage ring 4. A journal inserted into a mounting hole on the surface of the compressor casing 5 is arranged on the top of the adjustable stationary blade 6. The journal passes through the inner bushing 1, the mounting hole provided on the compressor casing 5 and the end of the rocker arm 2 away from the linkage ring 4 in sequence and then is threadedly engaged with the self-locking nut 3.

[0042] S3, wax filling is performed on the adjustable stationary blade 6 to fix it, so that the entire circle of the adjustable stationary blade 6 is wrapped in wax, thereby improving the stability of the adjustable stationary blade 6 during the grinding process;

[0043] S4, grinding the blade tip of the adjustable stator blade 6 in a processing workshop so that the blade tip size of the adjustable stator blade 6 meets the design requirements and the meridian flow channel line of the blade tip of the adjustable stator blade is a straight line;

[0044] S5, waxing the adjustable stator blades 6, recording the installation hole positions of the adjustable stator blades 6 on the compressor casing 5, so as to determine the installation hole position of each adjustable stator blade 6 on the compressor casing 5 during the grinding process, and removing the process parts to separate the adjustable stator blades 6 from the compressor casing 5 into a single-piece state;

[0045] S6, the processed adjustable stator blade 6 and the compressor casing 5 are put into storage as an assembly, and the inner liner 1, the rocker arm 2, the self-locking nut 3 and the linkage ring 4 are kept in the processing workshop for repeated use;

[0046] S7, during the final assembly of the engine, the assembly workshop receives the assembly of the adjustable stator blades 6 and the compressor casing 5 and assembles them with the remaining parts. When assembling the adjustable stator blades 6, the adjustable stator blades 6 are installed according to the installation hole positions recorded in step S5, and all the adjustable stator blades 6 are assembled using a consistent method.

[0047] In step S1, when the adjustable stator blade 6 is assembled to the compressor casing 5, the inner liner 1, the rocker arm 2, the self-locking nut 3 and the linkage ring 4 are produced, and the size of the process parts is consistent with the real parts. In this way, the adjustable stator blade 6 and the compressor casing 5 can be assembled in the processing workshop through the process parts, and there is no need to put the compressor casing 5 and the adjustable stator blade 6 into storage and then reallocate the parts to the processing workshop for processing the adjustable stator blade 6. The grinding process of the blade tip of the adjustable stator blade 6 is separated from the traditional assembly procedure, making the processing flow of the adjustable stator blade 6 simpler and more reasonable.

[0048] like Figure 3 As shown, when the adjustable stator blade 6 is assembled to the compressor casing 5, it is necessary to pass the shaft neck of the adjustable stator blade 6 through the compressor casing 5 and the rocker arm 2 from the inside to the outside, and then install the self-locking nut 3 on the shaft neck. The adjustable stator blade 6 is assembled to the compressor casing 5 by tightening the self-locking nut 3. However, in the grinding procedure, in order to prevent the adjustable stator blade 6 from swinging during the tip grinding process and affecting the grinding accuracy, when tightening the self-locking nut 3, a greater torque than that when the adjustable stator blade 6 is normally installed needs to be applied to the self-locking nut 3, so that the self-locking nut 3 is pressed against the upper surface of the rocker arm 2, and the adjustable stator blade 6 is pressed against the lower surface of the inner bushing 1. Therefore, when producing process parts, The process part of the inner liner 1 is made of rigid material. Compared with the flexible material used in the real parts of the inner liner 1, the rigid material used in the process part of the inner liner 1 is not easy to deform, and can not be deformed when the self-locking nut 3 is tightened, ensuring that the installation position of the adjustable stationary blade 6 is accurate. Only when the installation position of the adjustable stationary blade 6 is accurate can the grinding accuracy of the adjustable stationary blade 6 be ensured. At the same time, during the grinding process of step S4, the process part of the inner liner 1 can also resist the grinding cutting force, ensuring the stability of the adjustable stationary blade 6 during the grinding process of the blade tip of the adjustable stationary blade 6, thereby further improving the grinding accuracy of the blade tip of the adjustable stationary blade 6.

[0049] In step S6, the processed adjustable stator blades 6 and the compressor casing 5 on which the adjustable stator blades 6 are assembled when the adjustable stator blades 6 are ground are put into storage as an assembly to prevent mixing during subsequent out-of-stocking, resulting in the height dimension of the adjustable stator blade 6 exceeding the tolerance.

[0050] In step S5, after the grinding of the adjustable stator blades 6 is completed, the adjustable stator blades 6 need to be separated from the compressor casing 5 so that the process parts of the inner liner 1, the rocker arm 2, the self-locking nut 3 and the linkage ring 4 can be reused, and it is also convenient to put the adjustable stator blades 6 and the compressor casing 5 into storage. When disassembling the adjustable stator blades 6, it is necessary to first record the installation hole positions of the adjustable stator blades 6 on the compressor casing 5 during grinding, so that when the engine is generally assembled in the subsequent step S7, the ground adjustable stator blades 6 can be installed in the position where they were installed on the compressor casing 5 during grinding, so that the tip height size of the adjustable stator blades 6 after the engine is generally assembled is consistent with that in step S4.

[0051] Further, in step S1, when producing the inner liner 1 craftwork, the tolerance of the thickness dimension L1 of the inner liner 1 craftwork is less than the tolerance of the thickness dimension L1 of the inner liner 1 real part. When the inner liner 1 real part is assembled in the engine in step S7, Figure 4 As shown, the height dimension L3 tolerance of the tip of the adjustable stator blade 6 after installation includes the cumulative sum of the thickness dimension tolerance of the inner sleeve 1 process part and the thickness dimension tolerance of the real part of the inner sleeve 1. If the inner sleeve 1 needs to be replaced after being worn, there is no need to grind the tip of the adjustable stator blade 6 again, which can greatly save maintenance costs and improve maintainability. Reducing the thickness dimension tolerance of the inner sleeve 1 process part can reduce the tip dimension tolerance of the adjustable stator blade 6 after assembly, which is beneficial to ensure the consistency of the tip height dimension. Since the inner sleeve 1 process part adopts a rigid material with high hardness and not easy to deform, the thickness dimension tolerance grade of the inner sleeve 1 process part is improved compared with the real part of the inner sleeve 1, and it will not significantly increase the processing difficulty of the inner sleeve 1 process part.

[0052] The thickness tolerance of a plastic inner liner 1 of a certain type of engine is ±0.02mm, while the thickness tolerance of an inner liner 1 process part made of a rigid material is ±0.005mm.

[0053] Furthermore, the meridional flow path line of the tip of the adjustable stator blade 6 is a straight line, and the tip flow path of the adjustable stator blade 6 is designed as a conical surface obtained by rotating the meridional flow path line around the central axis of the compressor casing 5. The meridional flow path line of the tip of the adjustable stator blade 6 is designed as a straight line. When grinding the tip of the adjustable stator blade 6, a grinding wheel can be used for grinding, which greatly reduces the cutting force used in turning in the prior art, improves the processing stability and processing accuracy, and the use of a grinding wheel to grind the straight flow path makes the processing process simpler.

[0054] Furthermore, in step S2, after the adjustable stator blade 6 is assembled on the compressor casing 5, the self-locking nut 3 is tightened with a torque of 5-5.5 N·m. Since the inner sleeve 1 is made of a rigid material, when the self-locking nut 3 is tightened to press the adjustable stator blade 6 against the surface of the inner sleeve 1, the part will not be deformed under the pressure of the adjustable stator blade 6. Therefore, when the self-locking nut 3 is tightened in step S2, a larger torque can be applied to the self-locking nut 3 to increase the stability of the adjustable stator blade 6 during grinding, thereby indirectly improving the grinding accuracy.

[0055] Furthermore, in step S2, before tightening the self-locking nut 3, the process part of the linkage ring 4 is rotated to drive the adjustable stator blade 6 to rotate, and a cylindrical pin is inserted into the process part of the linkage ring 4 and the positioning hole provided in the compressor casing 5. Positioning holes for zeroing the linkage ring 4 are provided on the compressor casing 5 and the linkage ring 4. When the linkage ring 4 is coaxial with the positioning holes provided on the compressor casing 5, it means that the linkage ring 4 is in the zero position. At this time, the adjustable stator blade 6 is at a design angle of 0°, and the tip grinding of the adjustable stator blade 6 needs to be performed at the design angle of 0° of the adjustable stator blade 6.

[0056] Specifically, in step S5, when recording the installation hole positions of the adjustable stator blades 6 on the compressor casing 5, according to the design drawing of the compressor casing 5, the installation hole positions of the adjustable stator blades 6 on the casing are numbered according to the circumferential position distribution, and the batch number of the adjustable stator blade 6 parts installed in each numbered installation hole position is recorded to form an installation position file of the adjustable stator blade 6. When the adjustable stator blades 6 and the compressor casing 5 are produced, they will have specific numbers representing the batch on their surfaces. However, when installing the adjustable stator blades 6 in step S7, it is not only necessary to make the adjustable stator blades 6 and the compressor casing 5 aligned with each other, but also to make the adjustable stator blades 6 aligned with each other. In order to correspond to the compressor casing 5, it is also necessary to make the adjustable stator blades 6 correspond one-to-one with the mounting holes for mounting the adjustable stator blades 6 on the compressor casing 5. Therefore, it is necessary to number the mounting holes of the adjustable stator blades 6 on the casing according to the circumferential position distribution according to the design drawing of the compressor casing 5, and record the batch number of the adjustable stator blade 6 parts installed in each numbered mounting hole. In this way, when the engine is assembled in the subsequent step S7, it can be ensured that the installation position of the adjustable stator blades 6 is consistent with the installation position of the adjustable stator blades 6 on the compressor casing 5 in step S1.

[0057] Furthermore, in step S7, the assembly method of the adjustable stationary blade is as follows:

[0058] S71, assemble the adjustable stator blade 6 to the compressor casing 5 through the real parts of the inner bushing 1, the rocker arm 2, the self-locking nut 3 and the linkage ring 4. When tightening the self-locking nut 3, the tightening torque of the self-locking nut 3 is 2-2.2 N·m;

[0059] S72, the self-locking nut 3 is retracted and rotated 30-45°;

[0060] S73, using a flexible tool to tap the journal of the adjustable stator blade 6 radially inward to observe whether the adjustable stator blade 6 swings;

[0061] S74, if the adjustable stator blade 6 obviously swings, the self-locking nut 3 is rotated to tighten the self-locking nut 3 and rotated 1-20 degrees, and then step S73 is repeated until the adjustable stator blade 6 stops swinging.

[0062] When tightening the self-locking nut 3, a method of applying a certain torque to tighten it and then retreating it by a certain angle is adopted. By applying a certain torque to tighten it, it is ensured that the assembly gap between the compressor casing 5, the adjustable stator blade 6, and the inner bushing 1 is eliminated. At this time, the adjustable stator blade 6 cannot rotate. Then the self-locking nut 3 is retreated by a certain angle to generate a certain gap (generally about 0.05mm) between the adjustable stator blade 6 and the plastic inner bushing 1, so that the adjustable stator blade 6 can rotate smoothly and will not swing in the installation hole.

[0063] When tightening the self-locking nut 3, the tightening torque applied must first overcome the self-locking torque of the self-locking nut 3. If the tightening torque applied is too small, the assembly gap between the parts may not be effectively eliminated, which will bring uncertainty to the gap control after the self-locking nut 3 is retracted, and the self-locking torque of the self-locking nut 3 may not be overcome, and the stationary blade cannot be tightened; if the self-locking torque applied is large, the self-locking nut 3 needs to be retracted to a larger angle to achieve smooth rotation of the adjustable stationary blade 6, which will extend the time required to assemble the adjustable stationary blade 6; when the self-locking torque applied is too large, permanent plastic deformation will be caused to the inner sleeve 1, resulting in an out-of-tolerance of the inner sleeve 1, and the tip height size of the adjustable stationary blade 6 cannot be guaranteed.

[0064] Therefore, the tightening torque applied first should be greater than the self-locking torque of the self-locking nut 3, so as to prevent the inner bushing 1 from plastic deformation and eliminate the assembly gap between the parts in advance. The retraction angle of the self-locking nut 3 should be such that the adjustable stator blade 6 can rotate smoothly without swinging in the installation hole.

[0065] The tip height dimension and rotation adjustment angle function of the adjustable stator blade 6 are ensured by first tightening with a certain torque and then retreating at a certain angle for use.

[0066] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for controlling the tip size of an adjustable stator blade of a compressor, characterized in that: The steps include: S1, producing a process part for assembling an adjustable stator blade (6) onto a compressor casing (5), including a process part of an inner bushing (1), a rocker arm (2), a self-locking nut (3) and a linkage ring (4), the size of the process part being consistent with the real part, wherein the process part of the inner bushing (1) is made of a rigid material to prevent the process part of the inner bushing (1) from being deformed during the assembly and grinding of the adjustable stator blade (6), and the manufacturing materials of the process parts of the rocker arm (2), the self-locking nut (3) and the linkage ring (4) are consistent with the corresponding real parts; S2, the processing workshop produces the compressor casing (5) and the adjustable stator blade (6), assembles the adjustable stator blade (6) onto the compressor casing (5) in the processing workshop through the process parts of the inner bushing (1), the rocker arm (2), the self-locking nut (3) and the linkage ring (4), and after adjusting the adjustable stator blade (6) to the processing angle, tightens the process part of the self-locking nut (3) to lock the adjustable stator blade (6); S3, wax filling is performed on the adjustable stationary blade (6) to fix it, so that the entire circle of the adjustable stationary blade (6) is wrapped in wax; S4, grinding the blade tip of the adjustable stator blade (6) in a processing workshop so that the blade tip size of the adjustable stator blade (6) meets the design requirements and the meridional flow channel line of the blade tip of the adjustable stator blade (6) is a straight line; S5, waxing the adjustable stator blade (6), recording the installation hole position of the adjustable stator blade (6) on the compressor casing (5), so as to determine the installation hole position of each adjustable stator blade (6) on the compressor casing (5) during the grinding process, and removing the process parts so that the adjustable stator blade (6) and the compressor casing (5) are separated into a single piece state; S6, the processed adjustable stator blade (6) and the compressor casing (5) are put into storage as an assembly, and the inner bushing (1), the rocker arm (2), the self-locking nut (3) and the linkage ring (4) are kept in the processing workshop for repeated use; S7, during the final assembly of the engine, the assembly workshop receives the assembly of the adjustable stator blade (6) and the compressor casing (5) and assembles them with other parts. When assembling the adjustable stator blade (6), the adjustable stator blade (6) is installed according to the installation hole position recorded in step S5, and all the adjustable stator blades (6) are assembled using a consistent method; In step S7, when the adjustable stationary blade (6) is assembled onto the compressor casing (5), the assembly method is as follows: S71, assembling the adjustable stator blade (6) to the compressor casing (5) through the real parts of the inner bushing (1), the rocker arm (2), the self-locking nut (3) and the linkage ring (4), when tightening the self-locking nut (3), the tightening torque of the self-locking nut (3) is 2-2.2N·m; S72, the self-locking nut (3) is rotated back 30-45°; S73, using a flexible tool to tap the journal of the adjustable stator blade (6) radially inward to observe whether the adjustable stator blade (6) swings; S74, if the adjustable stator blade (6) swings obviously, tighten the self-locking nut (3) by 1-20°, and then repeat step S73 until the adjustable stator blade (6) stops swinging.

2. A compressor adjustable stator blade tip size control method according to claim 1, characterized in that: In step S1, the tolerance of the thickness dimension L1 of the inner liner (1) craft piece during processing is smaller than the tolerance of the thickness dimension L1 of the inner liner (1) actual part.

3. The method for controlling the tip size of an adjustable stator blade of a compressor according to claim 1, characterized in that: In step S2, after the adjustable stationary blade (6) is assembled on the compressor casing (5), the self-locking nut (3) is tightened with a torque of 5-5.5 N·m.

4. The method for controlling the tip size of an adjustable stator blade of a compressor according to claim 1, characterized in that: In step S2, before tightening the self-locking nut (3), the process part of the linkage ring (4) is rotated to drive the adjustable stator blade (6) to rotate, and then the cylindrical pin is inserted into the process part of the linkage ring (4) and the positioning hole provided in the compressor casing (5) so that the adjustable stator blade (6) is located at the processing angle.

5. The method for controlling the tip size of an adjustable stator blade of a compressor according to claim 1, characterized in that: In step S5, when recording the installation hole positions of the adjustable stator blades (6) on the compressor casing (5), the installation hole positions of the adjustable stator blades (6) on the casing are numbered according to the circumferential position distribution based on the design drawing of the compressor casing (5), and the batch number of the adjustable stator blade (6) parts installed in each numbered installation hole position is recorded to form an installation position file of the adjustable stator blade (6).

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