A method for using an aero-engine casing pressure test tool

Abstract

The application relates to an aero-engine casing pressure test tool and a use method thereof. The aero-engine casing pressure test tool comprises a sealing base, an adapter cylinder, a limiting cylinder, a sliding sealing plug and an upper cylinder. The limiting cylinder comprises an upper transmission force section and a lower transmission force section. The sliding sealing plug comprises a lower sliding disc which is in sliding and sealing cooperation with the inner wall of the upper transmission force section, an upper sliding disc which is in sliding and sealing cooperation with the inner wall of the upper cylinder, and a connecting column for connecting the lower sliding disc and the upper sliding disc. The upper part of the upper transmission force section is provided with an upper transmission force boss for limiting the lower sliding disc. The upper part of the lower transmission force section is provided with a lower transmission force boss for limiting the lower sliding disc. The lower sliding disc is arranged in the upper transmission force section, and the upper sliding disc is arranged in the upper cylinder. A pressure regulating cavity is formed between the upper sliding disc and the top wall of the upper cylinder. A load cavity is formed between the lower sliding disc, the upper transmission force section, the lower transmission force section, the measured casing, the adapter cylinder and the sealing base.

Description

Technical Field

[0001] This invention relates to the field of aircraft engine casing testing technology, and in particular to a method of using an aircraft engine casing pressure testing fixture. Background Technology

[0002] Aero-engine casings require sufficient strength reserves to withstand high gas pressures without cracking or significant deformation. Therefore, pressure testing is necessary to verify their strength. Aero-engine casings are typically cylindrical structures, subjected to outward radial gas pressure and axial tensile force during operation. Pressure testing simulates the stress state of the casing during operation, subjecting it to both radial and axial forces simultaneously. Current pressure testing methods typically involve sealing the casing with a sealing fixture and then applying hydraulic oil. While this method usually ensures adequate radial force loading, it introduces additional axial force, which is not adjustable. Alternatively, axial force loading instruments can be used to apply axial force to the casing during pressure testing, but these systems are complex. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a simple, easy-to-install, convenient-to-operate, and adjustable axial force test fixture for aero-engine casing pressure testing and its usage method.

[0004] To solve the above-mentioned technical problems, the present invention provides an aero-engine casing pressure testing fixture, comprising a sealing base, a transition cylinder, a limiting cylinder, a sliding sealing plug, and an upper cylinder. The limiting cylinder includes an upper force transmission section and a lower force transmission section. The sliding sealing plug includes a lower sliding plate that slides and seals with the inner wall of the upper force transmission section, an upper sliding plate that slides and seals with the inner wall of the upper cylinder, and a connecting post for connecting the lower sliding plate and the upper sliding plate. An upper force transmission boss for limiting the lower sliding plate is provided at the upper part of the upper force transmission section, and a lower force transmission boss for limiting the lower sliding plate is provided at the upper part of the lower force transmission section. In use, the bottom end of the transition cylinder is sealed to the sealing base. The top of the connecting cylinder is sealed to the bottom of the test casing, the top of the test casing is sealed to the bottom of the lower force transmission section, and the top of the lower force transmission section is sealed to the bottom of the upper force transmission section. The lower sliding plate is placed inside the upper force transmission section, and the upper sliding plate is placed inside the upper cylinder. A pressure regulating cavity is formed between the upper sliding plate and the top wall of the upper cylinder. A load cavity is formed between the lower sliding plate and the upper force transmission section, the lower force transmission section, the test casing, the connecting cylinder, and the sealing base. An upper oil inlet port communicating with the pressure regulating cavity is provided on the upper cylinder, and a lower oil inlet port communicating with the load cavity is provided on the sealing base. Multiple tie rods for limiting the upper cylinder and the sealing base are provided between the upper cylinder and the sealing base.

[0005] Furthermore, the outer wall of the sliding plate is provided with a first inner ring groove, and a first sealing ring is provided in the first inner ring groove, forming a sliding sealing fit between the first sealing ring and the force transmission section.

[0006] Furthermore, the outer wall of the upper sliding plate is provided with a second inner ring groove, and a second sealing ring is provided in the second inner ring groove, forming a sliding sealing fit between the second sealing ring and the inner wall of the upper cylinder.

[0007] Furthermore, the top of the pull rod is provided with an upper screw that is threadedly engaged with the first locking nut, and an upper limit boss is provided on the lower side of the upper screw. The bottom of the pull rod is provided with a lower screw that is threadedly engaged with the first locking nut, and a lower limit boss is provided on the upper side of the lower screw. The distance between the upper cylinder and the sealing base is limited by the upper limit boss and the first locking nut, and the lower limit boss and the first locking nut.

[0008] Furthermore, the two ends of the adapter cylinder are respectively provided with connecting outer ring platforms protruding outwards, and the two ends of the test casing are respectively provided with casing outer ring platforms protruding outwards. Screw holes are provided on the connecting outer ring platforms, and a sealing connection is made between the connecting outer ring platforms and the sealing base and the casing outer ring platforms.

[0009] Furthermore, both ends of the lower force transmission section are respectively provided with a lower force transmission outer ring platform protruding outwards, and a screw hole is provided on the lower force transmission outer ring platform, and a sealed connection is made between the lower force transmission outer ring platform and the outer ring platform of the casing.

[0010] Furthermore, the top end of the lower force transmission section protrudes inward to form a lower force transmission inner ring platform to form a lower force transmission boss; the bottom end of the upper force transmission section protrudes outward to form an upper force transmission outer ring platform, and the upper force transmission outer ring platform and the lower force transmission outer ring platform are sealed together; the top end of the upper force transmission section protrudes inward to form an upper force transmission inner ring platform to form an upper force transmission boss.

[0011] The method of using the aforementioned aero-engine casing pressure testing fixture includes the following steps: When the casing under test requires loading pressure and axial tensile force, hydraulic oil is loaded into the load cavity through the lower oil inlet to bring the load cavity to the required pressure; the sliding plate of the sliding seal plug slides upward to the force transmission section under pressure and approaches the force transmission boss. The sliding plate transmits the tensile force to the casing under test through the force transmission section and the lower force transmission section, causing the casing under test to be subjected to tensile force. Hydraulic oil is loaded into the pressure regulating cavity through the upper oil inlet. By adjusting the oil pressure in the pressure regulating cavity, the magnitude of the tensile force on the casing under test is changed; when the casing under test requires loading pressure and axial pressure, hydraulic oil is first injected into the pressure regulating cavity through the upper oil inlet, causing the sliding plate of the sliding seal plug to slide downward to the force transmission section under pressure and approach the boss. The lower force transmission boss transmits force to the test housing via the lower sliding plate, causing the test housing to bear pressure. Hydraulic oil is loaded into the load cavity through the lower oil inlet, so that the load cavity reaches the required pressure. The pressure on the test housing is changed by adjusting the oil pressure in the pressure regulating cavity. When the test housing requires the load pressure and the axial force is zero, a certain volume of hydraulic oil is first injected into the pressure regulating cavity through the upper oil inlet, so that the lower sliding plate of the sliding sealing plug is in the middle position between the lower force transmission boss and the upper force transmission boss, sealing the pressure regulating cavity and ensuring that the volume of hydraulic oil in the pressure regulating cavity remains unchanged. Hydraulic oil is then injected into the load cavity through the lower oil inlet, and the load cavity reaches the required pressure, so that the test housing reaches the required test pressure while ensuring that the test housing does not bear axial force.

[0012] Technical effects of the invention: (1) The pressure test fixture for the aero-engine casing of the present invention, compared with the prior art, can adjust the magnitude of the axial pressure or tension on the casing under test by adjusting the hydraulic oil pressure in the pressure regulating cavity by setting up a pressure regulating cavity, a limiting cylinder and a sliding sealing plug device; (2) Compared with using a loading instrument to load the axial force, the fixture has a simple structure and can be adapted to the actual size and shape of the casing, and has wide applicability; (3) The hydraulic oil pressure in the limiting cylinder can be adjusted with high precision, thereby realizing high-precision adjustment of the axial force. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings:

[0014] Figure 1 This is a cross-sectional structural diagram of the pressure testing fixture for an aero-engine casing;

[0015] Figure 2 This is a partial cross-sectional structural diagram of the pressure testing fixture for aero-engine casings;

[0016] Figure 3 This is a schematic cross-sectional view of the assembled limiting cylinder and sliding sealing plug;

[0017] Figure 4 This is a cross-sectional structural diagram of the pressure testing fixture for aero-engine casings during use.

[0018] Figure 5 This is a schematic diagram showing the usage status of the aero-engine casing pressure test fixture under casing loading pressure and axial tensile force.

[0019] Figure 6 This is a schematic diagram showing the usage status of the aero-engine casing pressure test fixture under casing loading pressure and axial pressure.

[0020] In the picture:

[0021] Sealing base 1, lower oil inlet 11, adapter cylinder 2, test casing 3, load cavity 31, limiting cylinder 4, lower force transmission section 41, upper force transmission section 42, lower force transmission boss 43, upper force transmission boss 44, pull rod 5, lower limiting boss 51, upper limiting boss 52, first locking nut 53, sliding sealing plug 6, lower sliding plate 61, upper sliding plate 62, first sealing ring 63, second sealing ring 64, upper cylinder 7, upper oil inlet 71, pressure regulating cavity 72, locking screw 8, second locking nut 81. Detailed Implementation

[0022] Example 1

[0023] like Figures 1 to 4 As shown, the aircraft engine casing pressure test fixture of this embodiment includes a sealing base 1, a transition cylinder 2, a limiting cylinder 4, a sliding sealing plug 6, and an upper cylinder 7. The sealing base 1 includes a disc-shaped sealing part and a cylindrical support part. The two ends of the transition cylinder 2 are respectively provided with connecting outer ring platforms protruding outwards. The two ends of the casing 3 under test are respectively provided with casing outer ring platforms protruding outwards. Eight screw holes are evenly distributed on the same circumference on the connecting outer ring platform. The sealing part is provided with eight through holes on the same circumference that are adapted to the screw holes. The connecting outer ring platform at the bottom contacts the sealing part of the sealing base 1 and is fixed by locking screws and locking nuts to achieve a sealed connection. The casing outer ring platform is also provided with through holes. The connecting outer ring platform at the top contacts the casing outer ring platform and is fixed by locking screws and locking nuts to achieve a sealed connection.

[0024] The limiting cylinder 4 includes an upward force transmission section 41 and a downward force transmission section 42 with the same inner and outer diameters. The sliding sealing plug 6 includes a lower sliding plate 61 that slides and seals with the inner wall of the upward force transmission section 41, an upper sliding plate 62 that slides and seals with the inner wall of the upper cylinder 7, and a connecting post for connecting the lower sliding plate 61 and the upper sliding plate 62. The outer wall of the lower sliding plate 61 is provided with a first inner ring groove, and a first sealing ring 63 is provided in the first inner ring groove, forming a sliding sealing fit between the first sealing ring 63 and the upward force transmission section 42. The outer wall of the upper sliding plate 62 is provided with a second inner ring groove, and a second sealing ring 64 is provided in the second inner ring groove, forming a sliding sealing fit between the second sealing ring 64 and the inner wall of the upper cylinder 7. The top end of the connecting post is fixedly connected to the center of the bottom surface of the upper sliding plate 62, and the bottom end of the connecting post is threadedly connected to the center of the top surface of the lower sliding plate 61.

[0025] The top of the force-up section 42 protrudes inward to form an inner force-up platform to create a force-up boss 44, which is used to limit the movement of the sliding plate 61. The connecting post extends from the center of the inner force-up platform. The bottom of the force-up section 42 protrudes outward to form an outer force-up platform, which has eight screw holes evenly distributed on the same circumference. The two ends of the force-up section 41 each protrude outward to form a lower force-up platform. The top of the force-up section 41 has eight through holes evenly distributed on the same circumference that match the screw holes. The force-up platform and the top of the force-up section 42 are connected by the outer force-up platform. The two sides of the platform are in contact and fixed by the locking screw 8 and the second locking nut 81 to achieve a sealed connection. The top of the lower force transmission section 41 is provided with an inner lower force transmission platform to form a lower force transmission boss 43. The outer ring platform of the casing at the top of the tested casing 3 has 8 screw holes evenly distributed on the same circumference. The outer ring platform of the lower force transmission section 41 at the bottom has 8 through holes that match the screw holes evenly distributed on the same circumference. The outer ring platform of the lower force transmission 41 is in contact with the outer ring platform of the casing at the top of the tested casing 3 and is fixed by the locking screw and the locking nut to achieve a sealed connection.

[0026] Eight pull rods 5 are provided between the upper cylinder 7 and the sealing base 1 to limit the movement of the upper cylinder 7 and the sealing base 1. Eight first screw holes are evenly distributed on the same circumference on the top wall of the upper cylinder 7. Eight through holes corresponding to the first screw holes are evenly distributed on the same circumference on the sealing part of the sealing base 1. An upper screw is provided at the top of the pull rod 5 to be threaded into the first locking nut 53. An upper limit boss 52 is provided on the lower side of the upper screw. A lower screw is provided at the bottom of the pull rod 5 to be threaded into the first locking nut 53. A lower limit boss 51 is provided on the upper side of the lower screw. The upper screw extends out of the first screw hole, and the lower screw extends out of the through hole. The distance between the upper cylinder 7 and the sealing base 1 is limited by the upper limit boss 52 and the first locking nut 53, and the lower limit boss 51 and the first locking nut 53.

[0027] During use, the bottom end of the adapter cylinder 2 is sealed to the sealing base 1, the top end of the adapter cylinder 2 is sealed to the bottom end of the test casing 3, the top end of the test casing 3 is sealed to the bottom end of the lower force transmission section 41, the top end of the lower force transmission section 41 is sealed to the bottom end of the upper force transmission section 42, the lower sliding plate 61 is placed inside the upper force transmission section 42, the upper sliding plate 62 is placed inside the upper cylinder 7, a pressure regulating cavity 72 is formed between the upper sliding plate 62 and the top wall of the upper cylinder 7, and a load cavity 31 is formed between the lower sliding plate 61 and the upper force transmission section 42, the lower force transmission section 41, the test casing 3, the adapter cylinder 2, and the sealing base 1. An upper oil inlet 71 communicating with the pressure regulating cavity 72 is provided on the upper cylinder 7, and a lower oil inlet 11 communicating with the load cavity 31 is provided on the sealing base 1.

[0028] Example 2

[0029] The method for using the pressure testing fixture for aero-engine casings includes the following steps: When the casing 3 under test requires applied pressure and axial tensile force, such as... Figure 5 As shown, hydraulic oil is loaded into the load chamber 31 through the lower oil inlet port 71, so that the load chamber 31 reaches the required pressure P. 31 The sliding plate 61 of the sliding sealing plug 6 slides down towards the force transmission section 42 under pressure and approaches the force transmission boss 44. The sliding plate 62 transmits the pulling force to the tested casing 3 through the force transmission section 42 and the lower force transmission section 41, so that the tested casing 3 is subjected to the pulling force. Hydraulic oil is loaded into the pressure regulating cavity 72 through the upper oil inlet port 11. The oil pressure P in the pressure regulating cavity 72 is adjusted. 72 Change the tension F acting on the tested casing 3 L Size; Tension F L The calculation formula is shown in equation (1).

[0030]

[0031] When the tested casing 3 requires loading pressure and axial pressure, such as Figure 6 As shown, hydraulic oil is first injected into the pressure regulating chamber 72 through the upper oil inlet port 71, and the pressure is P. 72 This causes the sliding sealing plug 6's lower sliding plate 61 to slide down to the lower force transmission section 41 under pressure and press against the lower force transmission boss 43. The lower sliding plate 61 transmits the force to the tested casing 3 through the lower force transmission boss 43, causing the tested casing 3 to bear pressure. Hydraulic oil is loaded into the load cavity 31 through the lower oil inlet 11, so that the load cavity 31 reaches the required pressure. The pressure F on the tested casing 3 is changed by adjusting the oil pressure in the pressure regulating cavity 72. Y Size; pressure F Y The calculation formula is shown in equation (2).

[0032]

[0033] When the test casing 3 requires a loading pressure and the axial force is zero, a certain volume of hydraulic oil is first injected into the pressure regulating cavity 72 through the upper oil inlet port 71. The calculation formula for the volume V of the hydraulic oil is shown in equations (3), (4), and (5). This ensures that the lower sliding plate 61 of the sliding sealing plug 6 is in the middle position between the lower force transmission boss 43 and the upper force transmission boss 44, thus sealing the pressure regulating cavity 72 and ensuring that the volume of hydraulic oil in the pressure regulating cavity 72 remains unchanged. Then, hydraulic oil is injected into the load cavity 31 through the lower oil inlet port 11, and the load cavity 31 reaches the required pressure, so that the test casing 3 reaches the required test pressure while ensuring that the test casing 3 does not bear axial force.

[0034]

[0035] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, these obvious variations or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A method of using a pressure testing fixture for an aero-engine casing, characterized in that, The aero-engine casing pressure testing fixture includes a sealing base, a transition cylinder, a limiting cylinder, a sliding sealing plug, and an upper cylinder. The limiting cylinder includes an upper force transmission section and a lower force transmission section. The sliding sealing plug includes a lower sliding plate that slides and seals with the inner wall of the upper force transmission section, an upper sliding plate that slides and seals with the inner wall of the upper cylinder, and a connecting post for connecting the lower sliding plate and the upper sliding plate. An upper force transmission boss for limiting the lower sliding plate is provided at the upper part of the upper force transmission section, and a lower force transmission boss for limiting the lower sliding plate is provided at the upper part of the lower force transmission section. In use, the bottom end of the transition cylinder is sealed to the sealing base, and the top end of the transition cylinder is sealed to the test chamber. The bottom of the test casing is sealed, the top of the test casing is sealed to the bottom of the lower force transmission section, the top of the lower force transmission section is sealed to the bottom of the upper force transmission section, the lower slide plate is placed inside the upper slide plate, the upper slide plate is placed inside the upper cylinder, a pressure regulating cavity is formed between the upper slide plate and the top wall of the upper cylinder, and a load cavity is formed between the lower slide plate and the upper force transmission section, the lower force transmission section, the test casing, the adapter cylinder, and the sealing base. The upper cylinder is provided with an upper oil inlet port that communicates with the pressure regulating cavity, and the sealing base is provided with a lower oil inlet port that communicates with the load cavity. Multiple tie rods for limiting the upper cylinder and the sealing base are provided between the upper cylinder and the sealing base. The method of using this aircraft engine casing pressure testing fixture includes the following steps. When the tested casing requires both applied pressure and axial tension, hydraulic oil is injected into the load cavity through the lower oil inlet to bring it to the required pressure. Under pressure, the sliding seal plug's lower plate slides upwards to the force transmission section and approaches the force transmission boss. The lower plate transmits tension through the force transmission sections to the tested casing, causing it to experience tension. Hydraulic oil is then injected into the pressure regulating cavity through the upper oil inlet. By adjusting the oil pressure in the pressure regulating cavity, the magnitude of the tension on the tested casing is changed. When the tested casing requires both applied pressure and axial pressure, hydraulic oil is first injected into the pressure regulating cavity through the upper oil inlet. This causes the sliding seal plug's lower plate to slide downwards to the force transmission section under pressure and press against the lower force transmission boss. The lower plate then transmits tension through the lower force transmission section. The boss transmits pressure to the test housing, causing it to bear pressure. Hydraulic oil is added to the load cavity through the lower oil inlet, bringing the load cavity to the required pressure. The pressure on the test housing is changed by adjusting the oil pressure in the pressure regulating cavity. When the test housing requires the applied pressure and the axial force is zero, a certain volume of hydraulic oil is first injected into the pressure regulating cavity through the upper oil inlet, so that the lower sliding plate of the sliding sealing plug is in the middle position between the lower force transmitting boss and the upper force transmitting boss, sealing the pressure regulating cavity and ensuring that the volume of hydraulic oil in the pressure regulating cavity remains constant. Hydraulic oil is then injected into the load cavity through the lower oil inlet, bringing the load cavity to the required pressure, so that the test housing reaches the required test pressure while ensuring that the test housing does not bear axial force.

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