CN110361136B

CN110361136B - Inter-shaft sealing tester

Info

Publication number: CN110361136B
Application number: CN201910656239.7A
Authority: CN
Inventors: 孔令成; 张杰一; 胡广阳; 慕伟
Original assignee: AECC Shenyang Engine Research Institute
Current assignee: AECC Shenyang Engine Research Institute
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2021-05-25
Anticipated expiration: 2039-07-19
Also published as: CN110361136A

Abstract

The utility model belongs to the technical field of aeroengine seal test, a sealed tester between axle is related to, including first pivot and second pivot, the end of first pivot passes through bearing interconnect with the end of second pivot, first pivot provides the sealed inner ring between the axle of follow-up, the second bearing provides the sealed outer loop between the axle of follow-up, sealed test piece setting between sealed inner ring between the axle and the sealed outer loop between the axle, support through supporting first pivot and second pivot forms bearing chamber and the compressed air chamber of experimental usefulness, open air inlet and gas outlet at the compressed air chamber, the gas flow through measuring air inlet and gas outlet assesses sealed test piece performance between the axle. The problem that special test equipment does not exist in the inter-shaft seal is solved, and the performance and reliability test task of the inter-shaft seal can be completed. The condition that the shaft-to-shaft sealing can only be checked on the whole engine is avoided, and the test cost and the test risk are reduced.

Description

Inter-shaft sealing tester

Technical Field

The application belongs to the technical field of aeroengine sealing tests, and particularly relates to an inter-shaft sealing tester.

Background

The aero-engines used domestically, abroad and developed are all 'multi-rotor' engines, and sealing between rotors is a key technology for restricting the development of the engines. The lack of the aircraft engine inter-shaft sealing tester results in that the inter-shaft sealing test cannot be carried out. Therefore, the novel type and novel structure of the inter-shaft seal cannot be tested and verified, and the development and application of the inter-shaft seal are greatly restricted due to the lack of test data support. With the development of the sealing specialty, the inter-shaft sealing tester is very urgently needed.

The known sealing tester is of a single-shaft structure, namely, an in-shaft sealing tester cannot carry out an inter-shaft sealing test project, the existing inter-shaft sealing verification can only be carried out along with the whole machine, the test cost is high, the inter-shaft sealing needing verification is often a newly developed technology, the technical maturity is often not high, the reliability needs to be verified, the problem easily occurs when the test is directly carried out on the whole machine, the test risk is high, the monitoring parameters of the whole machine at the inter-shaft sealing position are limited, and the performance of the inter-shaft sealing is difficult to comprehensively evaluate.

Disclosure of Invention

In order to solve the above problem, the present application provides an inter-shaft seal tester, including:

the support is provided with a first support arm, a second support arm, a third support arm and a fourth support arm;

the first rotating shaft is supported by a first bearing arranged on the first support arm and a second bearing arranged on the second support arm, and a follow-up inter-shaft sealing inner ring is arranged on the first rotating shaft;

the second rotating shaft is supported by a fourth bearing arranged on a fourth supporting arm, the cantilever end of the second rotating shaft is connected with the cantilever end of the first rotating shaft by a third bearing, and a follow-up inter-shaft sealing outer ring is arranged on the second rotating shaft;

the inter-shaft seal test piece floats between the inter-shaft seal inner ring and the inter-shaft seal outer ring to play a role in sealing;

first support arm, second support arm with first pivot forms first bearing chamber, third support arm, fourth support arm with the second pivot forms second bearing chamber, second support arm, third support arm with the chamber that the end of first pivot and second pivot formed is cut apart into compressed air chamber and test bearing chamber by the sealed test piece between the axle, test bearing chamber have with the through-hole of second bearing chamber intercommunication, compressed air chamber has inlet port and exhaust hole, the inlet port with be provided with the flowmeter on the exhaust hole.

Preferably, the cantilever end of the first rotating shaft is connected with the inner ring of the third bearing, the cantilever end of the second rotating shaft is provided with a flared part, and the flared part is sleeved on the outer ring of the third bearing.

Preferably, the second arm is sealed to the first shaft by a first circumferential seal.

Preferably, the third arm is sealed with the second rotating shaft by a second circumferential seal.

Preferably, a first sealing plate is arranged outside the first support arm of the bracket, and the first sealing plate is connected with the first rotating shaft through a first sealing element.

Preferably, a second sealing plate is arranged on the outer side of the fourth support arm of the support, and the second sealing plate is connected with the second rotating shaft through a second sealing element.

Preferably, the air inlet and the air outlet of the compressed air cavity are both provided with a flow regulating valve.

Preferably, an air inlet hole of the compressed air cavity is connected with an air inlet pipeline, and a heating device is arranged on the air inlet pipeline.

The condition that the shaft seal lacks the tester is solved in this application. The tester is provided with two rotating shafts and can simulate the rotating speed of high and low pressure shafts of an engine; the tester is provided with a gas sealing cavity and can simulate the internal working condition environment of the engine; the device has flow measurement capacity and can measure the leakage rate of the shaft seal.

Drawings

FIG. 1 is a schematic view of the present invention showing the structure of an inter-shaft seal tester.

FIG. 2 is a schematic view of the position of the vent hole of the present inter-axial seal tester.

Wherein, 1-bracket, 2-first rotating shaft, 3-inter-shaft sealing inner ring, 4-second rotating shaft, 5-inter-shaft sealing outer ring, 6-inter-shaft sealing test piece, 7-air vent, 8-air inlet and 9-air outlet;

11-a first support arm, 12-a second support arm, 13-a third support arm, 14-a fourth support arm;

21-a first bearing, 22-a second bearing, 23-a third bearing, 24-a fourth bearing;

31-first bearing cavity, 32-second bearing cavity, 33-compressed air cavity, 34-test bearing cavity;

41-first circumferential seal, 42-second circumferential seal, 43-first seal, 44-second seal.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the accompanying drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application, and should not be construed as limiting the present application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application. Embodiments of the present application will be described in detail below with reference to the drawings.

The application provides an inter-shaft seal tester, as shown in fig. 1, includes:

a bracket 1 having a first arm 11, a second arm 12, a third arm 13 and a fourth arm 14;

the first rotating shaft 2 is supported by a first bearing 21 arranged on the first support arm 11 and a second bearing 22 arranged on the second support arm 12, and a follow-up inter-shaft sealing inner ring 3 is arranged on the first rotating shaft 2;

the second rotating shaft 4 is supported by a fourth bearing 24 arranged on the fourth support arm 14, the cantilever end of the second rotating shaft 4 is connected with the cantilever end of the first rotating shaft 2 by a third bearing 23, and a follow-up inter-shaft sealing outer ring 5 is arranged on the second rotating shaft 4;

the shaft seal test piece 6 floats between the shaft seal inner ring 3 and the shaft seal outer ring 5 to play a sealing role;

first support arm 11, second support arm 12 with first pivot 2 forms first bearing chamber 31, third support arm 13, fourth support arm 14 with second pivot 4 forms second bearing chamber 32, second support arm 12, third support arm 13 with the chamber that the end of first pivot and second pivot formed is cut apart into compressed air chamber 33 and experimental bearing chamber 34 by sealed test piece 6 between the axle, experimental bearing chamber 34 have with the air vent 7 of second bearing chamber intercommunication, compressed air chamber 33 has inlet port and exhaust hole, the inlet port with be provided with the flowmeter on the exhaust hole.

It should be noted that, the bracket 1 is used for simulating a casing, and the first rotating shaft and the second rotating shaft simulate an engine rotating shaft, therefore, the arms of the bracket are named as compared with fig. 1, and actually the bracket is a cylindrical structure, the arms are annular plates in the cylindrical structure, the annular plates have central through holes for the rotating shaft to pass through, and the annular plates are used for dividing the space between the bracket and the rotating shaft into a plurality of chambers to simulate bearing chambers, wherein the first bearing chamber 31 and the second bearing chamber 32 are in an oil mist environment, the test bearing chamber 34 is formed by end structures of the two rotating shafts, one end is sealed by the inter-shaft seal test piece 6, and the other end is communicated with the second bearing chamber 32 through a vent hole, referring to fig. 2, the vent hole 7 can balance the pressure of the second bearing chamber 32, and the problem of oil leakage caused by the pressure rise of the test bearing chamber 33 is not generated.

Can let in highly-compressed air in the compressed air chamber 33, compressed air chamber opens has inlet port and exhaust hole, all is equipped with flowmeter and adjusting valve on admitting air and the exhaust pipe, can realize the pressure control to the compressed air intracavity through the regulation of valve, is equipped with the heating apparatus on the pipeline of admitting air simultaneously, can heat the processing to compressed air for compressed air chamber possesses pressure and temperature regulation function simultaneously, more truly must simulate the inside operational environment of engine.

In the present application, the performance of the inter-shaft seal test piece 6 is measured by the difference between the intake air flow rate and the exhaust gas flow rate. In the test process, the first rotating shaft 2 drives the inter-shaft sealing inner ring 3 to rotate, the second rotating shaft 4 drives the inter-shaft sealing outer ring 5 to rotate, the two shafts are driven by the motor and can rotate in the same direction or in the reverse direction, and the inter-shaft sealing test piece 6 floats between the inter-shaft sealing inner ring 3 and the inter-shaft sealing outer ring 5 to play a role in sealing.

In the application, the third bearing 23 is an intermediate bearing, and the mode of the intermediate bearing can ensure that the shaft seal inner ring 3 and the shaft seal outer ring 5 have good coaxiality, so that the assembly precision of the shaft seal is ensured.

In some alternative embodiments, the cantilever end of the first rotating shaft 2 is connected to the inner ring of the third bearing 23, the cantilever end of the second rotating shaft 4 has a flared portion, the flared portion is sleeved on the outer ring of the third bearing 23, referring to fig. 1, the following inter-shaft seal inner ring 3 on the first rotating shaft 2 is arranged between the second bearing 22 and the third bearing 23, the flared portion of the second rotating shaft is connected to the first rotating shaft through the third bearing, then continues to extend in the direction of the first rotating shaft, and forms a following inter-shaft seal outer ring 5 at the end of the extending portion, so as to be butted with the inter-shaft seal inner ring 3 through the inter-shaft seal test piece 6, at this time, the test bearing cavity 34 is formed between the flared portion and the inter-shaft seal test piece 6 of the second rotating shaft.

The support is fixed knot constructs in this application to simulation receiver, the pivot is rotated by motor drive, therefore need seal between support and the pivot, for example second support arm 12 with first pivot 2 seals through first circumferential seal 41, third support arm 13 with second pivot 4 seals through second circumferential seal 42.

Similarly, a first sealing plate is arranged on the outer side of the first support arm 11 of the support and connected with the first rotating shaft 2 through a first sealing element 43, and a second sealing plate is arranged on the outer side of the fourth support arm 14 of the support and connected with the second rotating shaft 4 through a second sealing element 44.

The first circumferential seal 41, the second circumferential seal 42, the first seal 43, and the second seal 44 may be configured as a labyrinth seal or a brush seal.

In the present application, the difference between the intake air flow rate and the exhaust gas flow rate is the inter-shaft seal test piece 6, the sum of the leakage rates of the first circumferential seal 41 and the second circumferential seal 42, and the leakage rate of the first circumferential seal 41 and the second circumferential seal 42 can be obtained by measuring with a uniaxial seal test device, so that the leakage rate of the inter-shaft seal test piece 6 under dynamic operation can be indirectly obtained.

The problem that special test equipment does not exist in the inter-shaft seal is solved, and the performance and reliability test task of the inter-shaft seal can be completed. The condition that the shaft-to-shaft sealing can only be checked on the whole engine is avoided, and the test cost and the test risk are greatly reduced compared with the test on the whole engine when the test is carried out on a tester.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An inter-shaft seal tester, comprising:

a support (1) having a first arm (11), a second arm (12), a third arm (13) and a fourth arm (14);

the first rotating shaft (2) is supported by a first bearing (21) arranged on the first support arm (11) and a second bearing (22) arranged on the second support arm (12), and a follow-up inter-shaft sealing inner ring (3) is arranged on the first rotating shaft (2);

the second rotating shaft (4) is supported by a fourth bearing (24) arranged on a fourth support arm (14), the cantilever end of the second rotating shaft (4) is connected with the cantilever end of the first rotating shaft (2) by a third bearing (23), and the second rotating shaft (4) is provided with a follow-up inter-shaft sealing outer ring (5);

the inter-shaft seal test piece (6) is arranged between the inter-shaft seal inner ring (3) and the inter-shaft seal outer ring (5);

first support arm (11), second support arm (12) with first pivot (2) form first bearing chamber (31), third support arm (13), fourth support arm (14) with second pivot (4) form second bearing chamber (32), second support arm (12), third support arm (13) with the chamber that the end of first pivot and second pivot formed is cut apart into compressed air chamber (33) and experimental bearing chamber (34) by sealed test piece (6) between the axle, experimental bearing chamber (34) have with air vent (7) of second bearing chamber intercommunication, compressed air chamber (33) have inlet port and exhaust hole, the inlet port with be provided with the flowmeter on the exhaust hole.

2. The shaft-to-shaft seal tester as recited in claim 1, characterized in that the cantilevered end of the first rotating shaft (2) is connected with the inner ring of the third bearing (23), and the cantilevered end of the second rotating shaft (4) has a flared portion which is sleeved on the outer ring of the third bearing (23).

3. An inter-shaft seal tester as claimed in claim 1, characterised in that the second arm (12) is sealed to the first shaft (2) by a first circumferential seal (41).

4. An inter-shaft seal tester as claimed in claim 1, characterised in that the third arm (13) is sealed to the second shaft (4) by a second circumferential seal (42).

5. The shaft seal tester according to claim 1, characterized in that a first seal plate is arranged outside the first arm (11) of the bracket, and the first seal plate is connected with the first rotating shaft (2) through a first seal member (43).

6. The shaft seal tester according to claim 1, wherein a second seal plate is provided on the outer side of the fourth arm (14) of the bracket, and the second seal plate is connected to the second rotating shaft (4) through a second seal member (44).

7. The shaft seal tester as claimed in claim 1, wherein flow regulating valves are provided on both the air intake hole and the air exhaust hole of the compressed air chamber (33).

8. The interaxial seal tester according to claim 1, wherein an air inlet of the compressed air chamber (33) is connected with an air inlet line and a warming device is provided on the air inlet line.