Telemetering module mounting hole structure for measuring dynamic stress of rotor blade in complete machine environment

Abstract

The invention relates to the technical field of aero-engines, and discloses a telemetering module mounting hole structure for measuring the dynamic stress of a rotor blade in the whole machine environment, and the structure comprises a rectangular mounting hole, a first boss, a second boss, a third boss, and a baffle plate. A second boss is arranged on the inner wall of the inner edge of the rectangular mounting hole, so that the telemetering module is mounted between the first boss and the second boss in an interference manner, the rectangular mounting hole is allowed to have small deformation in the radial direction, and the telemetering module in interference fit can be smoothly mounted; the rigidity of the rectangular mounting hole is improved through third convex blocks arranged on the two circumferential inner walls of the rectangular mounting hole; according to the invention, the problem of insufficient fatigue life caused by unstable installation of a telemetering module of an existing structure and concentrated stress at the edge of an installation hole can be effectively solved, and the reliability and safety of a dynamic stress measurement test of the whole engine rotor blade are improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology and discloses a telemetry module mounting hole structure for measuring the dynamic stress of rotor blades in the overall environment. Background Technology

[0002] In dual-rotor aero-engines, dynamic stress measurement test data for high-pressure compressor rotor blades under full-engine conditions is typically transmitted wirelessly via telemetry modules. Currently, the telemetry module installation scheme for this type of test involves modifying the compressor's front journal by machining multiple axial mounting holes at the spoke positions to insert the telemetry module. Considering the engine's high-temperature, high-speed operating environment, the structural design of the mounting holes must consider both the stability and ease of telemetry module installation, as well as the stress concentration issue at the hole edges.

[0003] Currently, the mounting hole structure of telemetry modules in engineering is as follows: Figure 1 As shown, it is a simple rectangular hole 1. Circular holes are machined at the two sharp corners on the upper side to reduce stress concentration. Multiple baffles are added to the rear end face of the hole for axial positioning. The main problem with this structure is: (1) Since the telemetry module is a finished product, in order to facilitate installation and disassembly, the clearance between it and the mounting hole must be large, which leads to the telemetry module easily generating radial or circumferential vibrations during the test. (2) The stress concentration at the edge of the current mounting hole structure is obvious, and the fatigue life cannot meet the requirements of dynamic stress measurement test. Summary of the Invention

[0004] The purpose of this invention is to provide a telemetry module mounting hole structure for measuring the dynamic stress of rotor blades in the overall engine environment. This structure can effectively solve the problems of unstable installation of existing telemetry modules and insufficient fatigue life caused by stress concentration at the edge of the mounting hole, thereby improving the reliability and safety of dynamic stress measurement tests on the rotor blades of the engine.

[0005] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is as follows: A mounting hole structure for a telemetry module used for measuring the dynamic stress of rotor blades in a whole-machine environment includes: A rectangular mounting hole is provided on the rotor journal for mounting the telemetry module. The four corners of the rectangular mounting hole are chamfered. The first boss is disposed on the inner wall of the outer edge of the rectangular mounting hole; The second protrusion is disposed on the inner wall of the inner edge of the rectangular mounting hole. There are at least two second protrusions. The telemetry module is interference-fitted between the first protrusion and the second protrusion. The third protrusion is disposed on the two circumferential inner walls of the rectangular mounting hole and is used to abut against the circumferential outer wall of the telemetry module; Baffles are respectively disposed on the first protrusion and the second protrusion, and are used to limit the axial movement of the telemetry model.

[0006] Furthermore, the first boss and the second boss are offset circumferentially.

[0007] Furthermore, the interference fit of the telemetry module during its interference fit installation between the first boss and the second boss is based on... ,in, This refers to the interference fit of the telemetry module when it is installed between the first and second bosses. The design compressive force for the telemetry module during interference fit between the first and second protrusions. , The coefficient of friction between the telemetry module and the contact surface of the first boss is given. This is the lower limit of the frictional force between the telemetry module and the contact surface of the first boss. The maximum allowable compressive stress of the telemetry module. The contact area between the telemetry module and the first protrusion is [area missing]. For the quality of the telemetry module, The radial height of the centroid of the telemetry module. The maximum operating speed of the engine for which the telemetry module is installed. The radial cross-sectional area of ​​the telemetry module is... The elastic modulus of the telemetry module along the radial direction. This represents the initial radial length of the telemetry module. The elastic modulus of the journal material. The initial length of the first boss along the radial direction; Let be the radial cross-sectional area of ​​the second boss. The initial length of the second boss along the radial direction.

[0008] Furthermore, the circumferential width of the first boss is less than the circumferential width of the groove between the two second bosses.

[0009] Furthermore, it also includes a fourth boss, which is disposed on the inner wall of the outer edge of the rectangular mounting hole. There are two fourth bosses, which are disposed on both sides of the first boss.

[0010] Furthermore, the circumferential width of the fourth boss is less than half the circumferential width of the first boss.

[0011] Furthermore, there are two third protrusions on each side, and the width of each third protrusion is less than half the width of the groove between the two third protrusions on the same side.

[0012] Furthermore, the four rounded edges of the rectangular mounting hole are radially machined using a first rounding radius, wherein the first rounding radius is 1 / 4 to 1 / 3 of the distance between the first boss and the second boss.

[0013] Compared with the prior art, the beneficial effects of this invention are: 1. The present invention provides a first boss on the inner wall of the outer edge of a rectangular mounting hole and a second boss on the inner wall of the inner edge of the rectangular mounting hole, so as to allow the telemetry module to be interference-fitted between the first boss and the second boss. This allows the rectangular mounting hole to have a small radial deformation, which facilitates the smooth installation of the interference-fit telemetry module. The rigidity of the rectangular mounting hole is improved by providing a third protrusion on the two circumferential inner walls of the rectangular mounting hole.

[0014] 2. This invention can effectively solve the problems of unstable installation of existing telemetry modules and insufficient fatigue life caused by stress concentration at the edge of the mounting holes, thereby improving the reliability and safety of dynamic stress measurement tests on the rotor blades of the engine. Attached Figure Description

[0015] Figure 1 A schematic diagram of the mounting hole structure for an existing telemetry module; Figure 2 This is a schematic diagram of the telemetry module mounting hole structure in the embodiment; Figure 3 This is a schematic diagram showing the structural dimensions of the telemetry module mounting holes in the embodiment; Among them, 1. Rectangular hole; 2. Rectangular mounting hole; 3. Telemetry module; 4. Chamfer; 5. First boss; 6. Second boss; 7. Third boss; 8. Baffle; 9. Fourth boss. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. However, this should not be construed as limiting the scope of the above-described subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0017] Example See Figures 1 to 3 A mounting hole structure for a telemetry module used for measuring the dynamic stress of rotor blades in a whole-machine environment, comprising: A rectangular mounting hole 2 is provided on the rotor journal for mounting the telemetry module 3. The four corners of the rectangular mounting hole 2 are respectively provided with chamfers 4. The first protrusion 5 is disposed on the inner wall of the outer edge of the rectangular mounting hole 2; The second protrusion 6 is disposed on the inner wall of the inner edge of the rectangular mounting hole 2. There are at least two second protrusions 6. The telemetry module 3 is interference-fitted between the first protrusion 5 and the second protrusion 6. The third protrusion 7 is disposed on the two circumferential inner walls of the rectangular mounting hole 2 and is used to abut against the circumferential outer wall of the telemetry module 3; Baffles 8 are respectively disposed on the first protrusion 5 and the second protrusion 6, and are used to limit the axial movement of the telemetry model.

[0018] In this embodiment, a first boss 5 is provided on the inner wall of the outer edge of the rectangular mounting hole 2, and a second boss 6 is provided on the inner wall of the inner edge of the rectangular mounting hole 2. The telemetry module 3 is interference-fitted between the first boss 5 and the second boss 6, allowing the rectangular mounting hole 2 to have small radial deformation, which facilitates the smooth installation of the interference-fit telemetry module 3. The baffle 8 is used to constrain axial displacement, and the rigidity of the rectangular mounting hole 2 is improved by the third protrusions provided on the two circumferential inner walls of the rectangular mounting hole 2. This can effectively solve the problems of unstable installation of the telemetry module 3 and insufficient fatigue life caused by stress concentration at the edge of the mounting hole in the existing structure, and improve the reliability and safety of the dynamic stress measurement test of the engine rotor blades.

[0019] In this embodiment, the first boss 5 and the second boss 6 are staggered circumferentially to ensure that the symmetrical central axes of the first boss 5 and the second boss 6 are not in the same radial direction, thus dispersing the compressive force and further avoiding the problem of unstable installation caused by local stress concentration.

[0020] In this embodiment, the interference fit of the telemetry module 3 when it is interference-fitted between the first boss 5 and the second boss 6 is based on... ,in, This refers to the interference fit of the telemetry module 3 when it is installed between the first boss 5 and the second boss 6. This refers to the design compressive force when the telemetry module 3 is interference-fitted between the first boss 5 and the second boss 6. , The coefficient of friction is the contact surface between the telemetry module 3 and the first protrusion 5. This is the lower limit of the frictional force between the telemetry module 3 and the first protrusion 5. The maximum allowable compressive stress of the telemetry module 3. The contact area between the telemetry module 3 and the first protrusion 5 is [missing information]. For the quality of telemetry module 3, The radial height of the centroid of telemetry module 3. The maximum operating speed of the engine where the telemetry module 3 is installed. The radial cross-sectional area of ​​the telemetry module 3 is... The elastic modulus of telemetry module 3 along the radial direction. The initial radial length of telemetry module 3; The elastic modulus of the journal (or first boss 5) material. The initial length of the first boss 5 along the radial direction; The radial cross-sectional area of ​​the second boss 6 is... The initial radial length of the second protrusion 6 is given. By comprehensively considering factors such as the contact area of ​​the telemetry module 3, the first protrusion 5, and the second protrusion 6, the material's elastic modulus, the initial length, the mass of the telemetry module 3 itself, the radial height of its center of mass, and the engine's maximum operating speed, a suitable interference fit is accurately calculated. This ensures that after the telemetry module 3 is properly assembled with the mounting hole, assembly is convenient and reliable without damaging the telemetry module 3, improving the stability of the telemetry module 3's installation, and avoiding installation difficulties or instability caused by excessive or insufficient interference fit.

[0021] The telemetry module 3 mounting hole structure in this embodiment also includes a fourth protrusion 9, which is disposed on the inner wall of the outer edge of the rectangular mounting hole 2. There are two fourth protrusions 9, which are disposed on both sides of the first protrusion 5. This can optimize the force on the telemetry module 3 and further improve the positioning stability.

[0022] like Figure 3 In practice, to ensure the stability of the telemetry module 3 during installation, the width L3 of the first protrusion 5 should be less than the circumferential width L1 of the groove between the two second protrusions 6; the width L4 of the fourth protrusion 9 should be greater than 2 mm and less than half the width L3 of the first protrusion 5. The width L2 of each second protrusion 6 should be greater than 2 mm and less than half the groove width L1 between two adjacent second protrusions 6. There are two third protrusions 7 on each side, and the width L7 of each third protrusion 7 should be greater than 2 mm and the groove width L6 between the two third protrusions 7 on the same side should be less than 2 mm.

[0023] In this embodiment, the four rounded edges of the rectangular mounting hole 2 are radially machined using a first rounding radius, wherein the first rounding radius is 1 / 4 to 1 / 3 of the distance between the first boss 5 and the second boss 6. This further reduces the local stress concentration at the corners of the rectangular mounting hole 2.

[0024] This embodiment can improve the installation stability of the telemetry module 3 and the fatigue life of the mounting hole edge by adopting a structure with multiple bosses and rounded corners, while ensuring that the overall scheme of the journal lead installation modification before the test remains unchanged.

[0025] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mounting hole structure for a telemetry module used for measuring the dynamic stress of rotor blades in a whole-machine environment, characterized in that, include: A rectangular mounting hole is provided on the rotor journal for mounting the telemetry module. The four corners of the rectangular mounting hole are chamfered. The first boss is disposed on the inner wall of the outer edge of the rectangular mounting hole; The second protrusion is disposed on the inner wall of the inner edge of the rectangular mounting hole. There are at least two second protrusions. The telemetry module is interference-fitted between the first protrusion and the second protrusion. The third protrusion is disposed on the two circumferential inner walls of the rectangular mounting hole and is used to abut against the circumferential outer wall of the telemetry module; Baffles are respectively disposed on the first protrusion and the second protrusion, and are used to limit the axial movement of the telemetry model.

2. The telemetry module mounting hole structure according to claim 1, characterized in that, The first boss and the second boss are offset circumferentially.

3. The telemetry module mounting hole structure according to claim 1, characterized in that, The interference fit of the telemetry module during its interference fit installation between the first and second protrusions is based on... ,in, This refers to the interference fit of the telemetry module when it is installed between the first and second bosses. The design compressive force for the telemetry module during interference fit between the first and second protrusions. , The coefficient of friction between the telemetry module and the contact surface of the first boss is given. This is the lower limit of the frictional force between the telemetry module and the contact surface of the first boss. The maximum allowable compressive stress of the telemetry module. The contact area between the telemetry module and the first protrusion is [area missing]. For the quality of the telemetry module, The radial height of the centroid of the telemetry module. The maximum operating speed of the engine for which the telemetry module is installed. The radial cross-sectional area of ​​the telemetry module is... The elastic modulus of the telemetry module along the radial direction. This represents the initial radial length of the telemetry module. The elastic modulus of the journal material. The initial length of the first boss along the radial direction; Let be the radial cross-sectional area of ​​the second boss. The initial length of the second boss along the radial direction.

4. The telemetry module mounting hole structure according to claim 1, characterized in that, The circumferential width of the first boss is less than the circumferential width of the groove between the two second bosses.

5. The telemetry module mounting hole structure according to claim 1, characterized in that, It also includes a fourth boss, which is disposed on the inner wall of the outer edge of the rectangular mounting hole. There are two fourth bosses, which are disposed on both sides of the first boss.

6. The telemetry module mounting hole structure according to claim 5, characterized in that, The circumferential width of the fourth boss is less than half the circumferential width of the first boss.

7. The telemetry module mounting hole structure according to claim 1, characterized in that, The number of third protrusions on each side is two, and the width of each third protrusion is less than half the width of the groove between the two third protrusions on the same side.

8. The telemetry module mounting hole structure according to claim 1, characterized in that, The four rounded edges of the rectangular mounting hole are radially machined using a first rounding radius, wherein the first rounding radius is 1 / 4 to 1 / 3 of the distance between the first boss and the second boss.

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