A combined rigid test support

Abstract

The present invention discloses a combined rigid test support, the test support comprises a base and a combined seat body, which are symmetrically distributed on the top of the base, used to install a test bearing, and rotatably connected to an aircraft engine rotor through the test bearing; the overall structural design of the present invention is to add two combined seat bodies on the base, so as to achieve effective support for a rotor with a shorter fulcrum span, thereby ensuring that fulcrums with similar distances have effective support points, further increasing the support rigidity of the structure. The test support is positioned and installed by the positioning strip in conjunction with the second positioning groove, and is connected and fastened in conjunction with a T-shaped slide groove and a T-shaped bolt, and is convenient for disassembly and assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of aircraft engine rotors, and in particular relates to a combined rigid test support. Background Art

[0002] The development of modern small and medium-sized aircraft engines hopes to achieve higher engine performance and use lighter rotor and stator parts. An important measure to achieve this goal is to increase the speed of aircraft engines, so that the rotors of small and medium-sized aircraft engines are developing in the direction of increasing aspect ratio and becoming more "flexible", with increasingly complex structures. Flexible rotors with high speed and high strain energy are generally used. Many rotors work above the first, second or even third critical speed, becoming very slender high-speed flexible rotors. The low-pressure rotor of a turbofan engine has the characteristics of small size, high speed and large aspect ratio, which makes the low-pressure rotor compact in structure design, with many fulcrums and the axial distance between the two fulcrums at the turbine end is very close (less than 100mm). This also brings great difficulties to the dynamic test of the low-pressure rotor, which is mainly reflected in the reliability and safety of the fulcrum support at the turbine end.

[0003] For two fulcrums that are very close to each other, the existing solution refers to Figure 1 As shown in the figure, the two bearing seats A and B are connected by tie rod C and fastened by nuts, and then connected and fastened with the test support through the bearing seat B for testing. The bearing seat A is suspended in the air, and it is impossible to ensure that the two fulcrums have effective support at the same time. This may be due to the insufficient rigidity of the tie rod C, which has certain risks and affects the safety of the test. Summary of the invention

[0004] In view of the above problems, the present invention discloses a combined rigid test support, which comprises:

[0005] Base;

[0006] A plurality of combined seat bodies are symmetrically distributed on the top of the base, used for installing test bearings, and rotatably connected to the aircraft engine rotor through the test bearings.

[0007] Preferably, the test support further comprises a bottom plate;

[0008] The bottom plate is fixed to the bottom of the base by bolt connection, and the bottom plate is fixedly connected to the test platform by a bolt assembly penetrating the bottom plate and the base.

[0009] Preferably, ribs are provided on both sides of the base.

[0010] Preferably, the combined seat body comprises an upper half seat and a lower half seat;

[0011] The upper seat and the lower seat are connected by a plurality of bolt assemblies symmetrically distributed on both sides, and a circular through hole is provided on the upper seat and the lower seat with the connection as the center for installing the test bearing.

[0012] Preferably, the plurality of symmetrically distributed combined seat bodies are spaced apart from each other, and the circular through holes of the plurality of combined seat bodies are coaxially arranged.

[0013] Preferably, a first positioning groove is correspondingly provided at the connection between the upper half seat and the lower half seat, and the upper half seat is installed corresponding to the lower half seat through the first positioning groove and the positioning pin.

[0014] Preferably, mounting ears are provided on both sides of the lower seat, and are connected to the base in a threaded manner through the mounting ears.

[0015] Preferably, a T-shaped slot is provided on the top of the base perpendicular to the installation direction of the combined base body, and the base is slidably installed with a T-shaped bolt through the T-shaped slot, and is connected to the mounting ear seat through the T-shaped bolt.

[0016] Preferably, a positioning strip is provided at the bottom of the base plate, and the test platform is provided with a second positioning groove corresponding to the positioning strip, and the test platform positions and installs the base plate through the positioning strip and the second positioning groove.

[0017] Preferably, lifting rings are symmetrically distributed on both sides of the top of the base for lifting the test support.

[0018] Preferably, a mounting boss is provided on the top of the combined seat body, and threaded holes are provided on the top of the mounting boss and the side end surface of the combined seat body, and the threaded holes are used to install a vibration acceleration sensor for monitoring the vibration of the test support.

[0019] The overall structural design of the present invention is to add two combined seat bodies on the base, so as to achieve effective support for rotors with shorter fulcrum spans, thereby ensuring that fulcrums with similar distances have effective support points, further increasing the support rigidity of the structure. The test support is positioned and installed by the positioning strip in conjunction with the second positioning groove, and is connected and fastened with T-shaped slide grooves and T-shaped bolts, which is convenient for disassembly and assembly; in addition, the spaced combined seat bodies can be adjusted in position by T-shaped bolts, so that the axial distance of the combined seat bodies can be adjusted according to the fulcrum span of the rotor. Therefore, the present invention can match rotors with different support spans to meet the rotor test requirements. On the other hand, it is also convenient to disassemble and maintain the combined seat body.

[0020] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a rotor test scheme according to the prior art is shown;

[0023] Figure 2 A front view of a test support according to an embodiment of the present invention is shown;

[0024] Figure 3 A left side view of a test support according to an embodiment of the present invention is shown.

[0025] In the figure: 100, combined seat body; 11, upper seat; 12, lower seat; 13, first connecting seat; 14, second connecting seat; 15, mounting boss; 16, mounting ear seat; 17, positioning pin; 200, base; 21, T-slot; 300, bottom plate; 31, positioning strip; 400, T-bolt; 500, lifting ring; 600, rib plate; h1, circular through hole; h2, first positioning groove. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The present invention proposes a combined rigid test support, such as Figure 2 As shown, the test support includes: a base 200 and a plurality of combined seat bodies 100, wherein the plurality of combined seat bodies 100 are symmetrically distributed on the top of the base 200, and are used to install a test bearing and are rotatably connected to the aircraft engine rotor through the test bearing.

[0028] In one embodiment of the present invention, the overall structural design of the rigid test support is to add two combined seat bodies 100 on the base 200, so as to achieve effective support for the rotor with a shorter fulcrum span, thereby ensuring that fulcrums with similar distances have effective support points, further increasing the support rigidity of the structure.

[0029] refer to Figure 2 As shown, the test support further includes a bottom plate 300 , which is fixed to the bottom of the base 200 by bolt connection, and the bottom plate 300 is fixedly connected to the test platform by a bolt assembly penetrating the bottom plate 300 and the base 200 .

[0030] In this embodiment, two groups of T-shaped slide grooves are arranged in parallel on the top of the test platform. Before installing the test support, multiple groups of T-shaped bolts 400 are first preset in the T-shaped slide grooves, and the positions of the T-shaped bolts 400 are adjusted so that the T-shaped bolts 400 are facing the mounting holes on the base plate 300. The base plate 300 and the test support are fixedly connected by the T-shaped bolts 400 and nuts.

[0031] It is necessary to explain that the position of the test support can be adjusted by moving the T-bolt 400 in the T-slot in advance, thereby facilitating the presetting of the installation position of the test support and facilitating subsequent test processes.

[0032] refer to Figure 2 As shown, in this embodiment, the base 200 can be a T-shaped structure, the top of the T-shaped structure is used to install the combined seat body 100, and external ear seats are provided on both sides. Ribs 600 are provided on both sides of the base 200 to improve the rigidity of the base 200 and meet the requirements of the rotor test. The ribs 600 are arranged on the external ear seats, and multiple groups of mounting holes are preset on the external ear seats on both sides of the ribs 600. The mounting holes are arranged corresponding to the mounting holes on the bottom plate 300. During installation, the T-shaped bolts 400 pass through the mounting holes on the bottom plate 300 and the base 200 in turn, and are locked by the matching nuts to fix the test support and the test platform. Of course, the base 200 of this embodiment can also be a cylindrical structure, and is not limited to the above-mentioned T-shaped structure. The configuration of the base 200 can meet the functions of being able to be installed corresponding to the bottom plate 300 and fixedly connected to the test platform. This embodiment does not specifically limit the structure of the base 200.

[0033] For further reference, Figure 2As shown, the bottom plate 300 is preset with multiple groups of mounting threaded holes, and the mounting boss 15 of the base 200 is provided with through holes corresponding to the above-mentioned mounting threaded holes. When the bottom plate 300 and the base 200 are installed and connected, the fixing bolts pass through the through holes on the base 200 and form a threaded connection with the mounting threaded holes on the bottom plate 300, so as to lock and fix the base 200 and the bottom plate 300.

[0034] refer to Figure 2 As shown, the combined seat body 100 includes an upper seat 11 and a lower seat 12; the upper seat 11 is a columnar structure with a semicircular cross section, and the lower seat 12 is a quadrangular column structure corresponding to the upper seat 11, and the first connecting seat 13 and the second connecting seat 14 are respectively provided on both sides of the upper seat 11 and the lower seat 12, and the upper seat 11 and the lower seat 12 are connected by a plurality of groups of bolt assemblies symmetrically distributed on both sides, which penetrate the first connecting seat 13 and the second connecting seat 14 in sequence, and the upper seat 11 and the lower seat 12 are provided with a circular through hole h1 with the connection as the center, which is used to install the test bearing. In actual use, the edge of the circular through hole h1 is chamfered to facilitate the disassembly and assembly of the test bearing. Of course, after the test bearing is installed, it is also necessary to match the stop flanges on the circumferential positions on both sides of the circular through hole h1. The middle part of the stop flange is provided with a circular notch corresponding to the test bearing. During the rotor test, the fulcrums at both ends of the rotor pass through the circular notch to contact the test bearing. In addition, the symmetrically distributed combined seat bodies 100 are arranged at intervals, and the circular through holes h1 of the combined seat bodies 100 are arranged coaxially.

[0035] refer to Figure 3 As shown, the first connection seat 13 and the second connection seat 14 at the connection of the upper half seat 11 and the lower half seat 12 are correspondingly provided with a first positioning groove h2. Before the upper half seat 11 and the lower half seat 12 are locked and connected, the upper half seat 11 cooperates with the positioning pin 17 through the first positioning groove h2 to position the upper half seat 11 and the lower half seat 12. Among them, the positioning pin 17 can be a cylindrical structure. At this time, the structure of the first positioning groove h2 is set corresponding to the cylindrical structure of the positioning pin 17, so that the upper half seat 11 and the lower half seat 12 are positioned by the positioning pin 17 and the first positioning groove h2. Of course, the positioning pin 17 of this embodiment can also be a prismatic structure or other special-shaped structures, and is not limited to the above-mentioned cylindrical structure. At this time, the structure of the first positioning groove h2 is set corresponding to the structure of the positioning pin 17. The configuration of the positioning pin 17 can cooperate with the first positioning groove h2 to position the upper half seat 11 and the lower half seat 12. This embodiment does not specifically limit the configuration of the positioning pin 17.

[0036] In this embodiment, a plurality of the combined seat bodies 100 are arranged at intervals, and the circular through holes h1 between the plurality of combined seat bodies 100 are kept coaxially arranged. When performing a rotor test, a test bearing is assembled in the circular through hole h1, and the rotor is rotatably connected through the test bearing, thereby maintaining effective support for all fulcrums on the outer side of the circumference of the rotor, thereby improving the test stability of the test support and ensuring the safety of the test.

[0037] In one embodiment of the present invention, reference Figure 2 As shown, mounting ears 16 are also provided at the bottom of both sides of the lower half seat 12, and are connected to the base 200 in a threaded manner through the mounting ears 16. A T-slot 21 is provided at the top of the base 200 perpendicular to the installation direction of the combined base body 100, and the base 200 is slidably installed with a T-bolt 400 through the T-slot 21, and is connected to the mounting ears 16 through the T-bolt 400.

[0038] Among them, mounting ears 16 are symmetrically arranged on both sides of the lower half seat 12, and the mounting ears 16 are provided with multiple groups of through holes. A T-shaped slot 21 is penetrated through the base 200 in a direction perpendicular to the combined seat body 100, and a T-shaped bolt 400 is slidably arranged in the T-shaped slot 21. When splicing the combined seat body 100 and the base 200, the position of the T-shaped bolt 400 is first pre-adjusted, and then the through holes of the mounting ears 16 are installed corresponding to the T-shaped bolt 400, and the T-shaped bolt 400 is locked by the matching nut, thereby completing the fixed connection of the combined seat body 100 and the base 200.

[0039] Furthermore, the spaced-apart combined seat bodies 100 can be adjusted in position by means of T-bolts 400, so that the axial distance of the combined seat bodies 100 can be adjusted according to the fulcrum span of the rotor. Therefore, the present invention can match rotors with different support spans and meet rotor test requirements. On the other hand, it is also convenient to disassemble and maintain the combined seat bodies 100.

[0040] Furthermore, the screw rod of the T-bolt 400 is transitionally fitted with the inner wall of the T-slot 21, thereby ensuring that when the position of the combined seat body 100 is installed or adjusted, the installation direction of the combined seat body 100 is always perpendicular to the slot body direction of the T-slot 21, further ensuring that the centers of the spaced-apart combined seat bodies 100 are coaxially arranged and coincide with each other, so as to improve the stability of the rotor test.

[0041] refer to Figure 2As shown, a positioning strip 31 is provided at the bottom of the base plate 300, and the test platform is provided with a second positioning groove corresponding to the positioning strip 31. The test platform positions and installs the base plate 300 through the positioning strip 31 and the second positioning groove. In this embodiment, the positioning strip 31 is a long strip structure, and the installation process of the base plate 300 is positioned in cooperation with the second positioning groove.

[0042] Furthermore, in order to limit the installation direction of the test support and prevent the staff from misoperating and causing the installation direction of the test support to be wrong, the present invention can set a limit block at one end of the positioning strip 31, and the cross-sectional size of the limit block is larger than the cross-sectional size of the positioning strip 31, and a limit groove is provided at one end of the corresponding second positioning groove. When the installation direction of the test support is wrong in actual use, since the limit block is not installed in the corresponding limit groove, the test support cannot be completely installed in place at this time, and the staff can reinstall the test support according to the on-site representation, ensuring that the installation direction of the test support will not be wrong.

[0043] Furthermore, the connection between the test platform and the test support is locked by a T-bolt 400, and the connection process is positioned by a positioning strip 31. The overall installation and connection process is simple and fast, and it can also be easily dismantled, effectively improving the work efficiency of the staff.

[0044] refer to Figure 2 As shown, the top of the base 200 is symmetrically provided with lifting rings 500 on both sides, which are used to lift the test support and position and install the test support corresponding to the test platform. As shown, there are at least two lifting rings 500, which are fixed to the top of the base 200 by welding. Of course, the bottom of the lifting ring 500 can also be welded with a screw, and a threaded hole is set on the top of the corresponding base 200. The lifting ring 500 is locked and connected with the base 200 by the screw and the threaded hole on the base 200. This embodiment does not specifically limit the fixing method of the lifting ring 500. When in use, multiple lifting rings 500 are passed through in sequence by the lifting equipment. After lifting, the center of gravity of the test support is controlled not to shift, thereby ensuring that the positioning and installation process of the test support can proceed smoothly, thereby ensuring the safety of the test.

[0045] refer to Figure 2As shown, a mounting boss 15 is provided on the top of the combined seat body 100, and the top end surface of the mounting boss 15 is parallel to the connection surface of the upper half seat 11 and the lower half seat 12. The top of the mounting boss 15 and the side end surface of the combined seat body 100 are both provided with threaded holes, and the threaded holes are used to install a vibration acceleration sensor for monitoring the vibration of the test support. In this embodiment, multiple groups of vibration acceleration sensors are arranged around the fulcrum of the rotor to monitor the vibration of the rotor test process, thereby collecting multiple groups of vibration data for analysis, and improving the reliability of the data analysis results.

[0046] In this embodiment, the vibration acceleration sensor is fixedly mounted on the above-mentioned threaded hole by means of a threaded connection. During the rotor test, the vibration generated by the rotation of the rotor is sequentially transmitted to the vibration acceleration sensor distributed on the combination seat 100 through the test bearing and the combination seat 100. The vibration acceleration sensor can be a piezoelectric acceleration sensor, which uses piezoelectric materials as sensitive elements. The oscillating mass block in the sensor generates an inertial force under the action of acceleration, and this force produces a piezoelectric effect on the piezoelectric material with a certain stiffness. Within a frequency range lower than the natural frequency of the oscillating mass block, the amount of electricity output by the sensor is proportional to the acceleration. The output electricity of the sensor represents the magnitude of the acceleration, thereby quantifying the magnitude of the vibration generated by the rotation of the rotor.

[0047] Of course, the vibration acceleration sensor can also be a piezoresistive acceleration sensor, a capacitive acceleration sensor or other types of vibration acceleration sensors, by setting different sensitive elements and using different parameters to characterize the magnitude of acceleration, so as to achieve the purpose of measuring the magnitude of vibration. This embodiment does not limit the specific type of the vibration acceleration sensor.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combined rigid test support, characterized in that: The test support comprises: Base(200); A plurality of combined seat bodies (100) are symmetrically distributed on the top of the base (200), used for mounting a test bearing and rotatably connected to an aircraft engine rotor via the test bearing; The combined seat body (100) comprises an upper half seat (11) and a lower half seat (12); The upper seat (11) and the lower seat (12) are connected by a plurality of bolt assemblies symmetrically distributed on both sides, and a circular through hole (h1) is provided on the upper seat (11) and the lower seat (12) with the connection point as the center, for mounting the test bearing; A first positioning groove (h2) is correspondingly provided at the connection point between the upper half seat (11) and the lower half seat (12); the upper half seat (11) is installed correspondingly to the lower half seat (12) through the first positioning groove (h2) and the positioning pin (17); The top of the combined seat body (100) is provided with a mounting boss (15), the top of the mounting boss (15) and the side end surface of the combined seat body (100) are both provided with threaded holes, and the threaded holes are used to install a vibration acceleration sensor for monitoring the vibration of the test support; The test support further comprises a bottom plate (300); The bottom plate (300) is fixed to the bottom of the base (200) by means of bolt connection, and the bottom plate (300) is fixedly connected to the test platform by means of a bolt assembly penetrating the bottom plate (300) and the base (200).

2. The combined rigid test support according to claim 1, characterized in that: Ribs (600) are provided on both sides of the base (200).

3. The combined rigid test support according to claim 1, characterized in that: The plurality of symmetrically distributed combined seat bodies (100) are arranged at intervals, and the circular through holes (h1) of the plurality of combined seat bodies (100) are arranged coaxially.

4. The combined rigid test support according to claim 1, characterized in that: Mounting ears (16) are provided on both sides of the lower seat (12), and are connected to the base (200) by means of threaded connection via the mounting ears (16).

5. The combined rigid test support according to claim 4, characterized in that: A T-shaped slot (21) is provided on the top of the base (200) perpendicular to the installation direction of the combined base body (100); a T-shaped bolt (400) is slidably installed on the base (200) through the T-shaped slot (21) and is connected to the installation ear seat (16) through the T-shaped bolt (400).

6. The combined rigid test support according to claim 1, characterized in that: The bottom of the base plate (300) is provided with a positioning strip (31), and the test platform is provided with a second positioning groove corresponding to the positioning strip (31). The test platform positions and installs the base plate (300) through the positioning strip (31) and the second positioning groove.

7. The combined rigid test support according to claim 1, characterized in that: Lifting rings (500) are symmetrically distributed on both sides of the top of the base (200) for lifting the test support.

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