Single rotor bearing cavity comprehensive simulation test device

Abstract

The present invention provides a comprehensive simulation test device for a single rotor bearing cavity, comprising: a test cavity and a process cavity, the test cavity and the process cavity being separated and not connected to each other; a front heating cavity, provided with a heating cavity inlet, a first heating cavity outlet, and a second heating cavity outlet, the heating cavity inlet being connected to a high-temperature air supply port, and the first heating cavity outlet being connected to the test cavity; a mixing cavity, the mixing cavity inlet being connected to the second heating cavity outlet, and the mixing cavity outlet being connected to a mixing cavity vent; and a normal temperature air supply channel, the first outlet of the normal temperature air supply channel being connected to the mixing cavity, and the second outlet of the normal temperature air supply channel being connected to the process cavity. The present invention can simulate operating conditions close to those of an engine bearing cavity, simulate the sealing cavity temperature through high-temperature air supply, and precisely control the bearing cavity peripheral temperature simulation using electric heating. Multiple types of thermal insulation structures reduce temperature exchange between different cavities, thus enabling the establishment and coordination of test conditions with different temperatures in multiple regions.

Description

Technical Field

[0001] The present invention relates to the field of aero-engine technology, and in particular to a comprehensive simulation test device for a single rotor bearing cavity. Background Art

[0002] The bearing cavity is a vital component of an aircraft engine, and a reliable bearing cavity is a prerequisite for ensuring the normal operation of the engine. It ensures the reliable operation of the main pivot bearing through structures such as support, sealing, oil supply and return, and ventilation, while also ensuring that the lubricating oil in the cavity circulates throughout the entire system without leakage. Currently, the evaluation of the bearing cavity is mainly based on analytical methods and simplified numerical simulations. Due to the involvement of gas-liquid two-phase flow and high rotor speed, the inlet and outlet boundary conditions are complex, making analysis difficult and it is difficult to simulate the actual operating conditions in the bearing cavity. As the thermal load state of the engine continues to increase, research and assessment tests are urgently needed before the newly designed bearing cavity is assembled into the entire machine for multi-state testing. Summary of the Invention

[0003] In view of this, the embodiments of this specification provide a single rotor bearing cavity comprehensive simulation test device to provide support for engine design and guarantee for engine whole machine testing.

[0004] The technical solution of an embodiment of the present invention is: a single-rotor bearing cavity comprehensive simulation test device, comprising: a test chamber and a process chamber, the test chamber and the process chamber are spaced apart and not connected to each other; a front heating chamber, provided with a heating chamber inlet, a first heating chamber outlet and a second heating chamber outlet, the heating chamber inlet is connected to the high-temperature air supply port, and the first heating chamber outlet is connected to the test chamber; a mixing chamber, the mixing chamber inlet is connected to the second heating chamber outlet, and the mixing chamber outlet is connected to the mixing chamber vent; a normal temperature air supply duct, the first outlet of the normal temperature air supply duct is connected to the mixing chamber, and the second outlet of the normal temperature air supply duct is connected to the process chamber.

[0005] Furthermore, the single rotor bearing cavity comprehensive simulation test device also includes a front grate sealing cavity, and the normal temperature air supply passage also includes a third outlet of the normal temperature air supply passage, and the third outlet of the normal temperature air supply passage is connected to the front grate sealing cavity.

[0006] Furthermore, a main shaft and a drive shaft are provided in the process chamber, and the main shaft and the drive shaft are connected through gears.

[0007] Furthermore, the single-rotor bearing cavity comprehensive simulation test device also includes a first flexible coupling and a slip ring induction device, and the end of the main shaft away from the test cavity is connected to the slip ring induction device through the first flexible coupling.

[0008] Furthermore, the single-rotor bearing cavity comprehensive simulation test device also includes a second flexible coupling and a drive motor, and the drive shaft and the end away from the test cavity are connected to the drive motor through the second flexible coupling.

[0009] Furthermore, the single rotor bearing cavity comprehensive simulation test device also includes an oil supply pipe, an oil return pipe and a ventilation pipe, and the oil supply pipe, the oil return pipe and the ventilation pipe are all connected to the test cavity.

[0010] Furthermore, an electric heating cover for heating the test cavity is provided outside the test cavity.

[0011] Furthermore, the single rotor bearing cavity comprehensive simulation test device also includes a front casing, a rear casing and a support seat. The rear casing and the support seat jointly support the test cavity. The front casing is fixedly connected to the rear casing, and the front casing is used to support the process cavity.

[0012] Furthermore, the single rotor bearing cavity comprehensive simulation test device also includes a front support and a rear support, the front support is connected to the rear casing, and the rear support is connected to the rear casing and the support seat.

[0013] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: the present invention can simulate the working conditions close to those of the engine bearing cavity, realize the temperature simulation of the sealing cavity through high-temperature air supply, and use electric heating to accurately control the peripheral temperature simulation of the bearing cavity. Various types of thermal insulation structures reduce the temperature exchange between different cavities, and realize the establishment and coordination of different temperature test conditions in multiple regions. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 It is a structural diagram of an embodiment of the present invention;

[0016] Figure 2 It is a partial enlarged view of an embodiment of the present invention.

[0017] 1. Assembly symbols in the figure: 1. induction housing; 2. slip ring induction; 3. first flexible coupling; 4. first grate; 5. first sealing seat; 6. process chamber housing cover; 7. driven gear; 8. main shaft; 9. process chamber vent; 10. process chamber nozzle; 11. front fulcrum bearing; 12. normal temperature air supply channel; 13. mixing chamber vent; 14. front casing; 15. high temperature air supply port; 16. rear casing; 17. ventilation oil supply pipe; 18. support seat; 19. fourth sealing seat; 20. fourth grate; 21. thermal insulation layer; 22. test lead port; 23. electric heating cover; 24. graphite sealing assembly; 25. compression sleeve; 26. graphite sealing runway; 27. , bearing chamber nozzle; 28, rear rotor mounting end cover; 29, rear rotor; 30, oil guide ring; 31, clamping nut; 32, test bearing; 33, bearing seat; 34, rear cover; 35, oil return pipe; 36, rear support; 37, front support; 38, third grate teeth; 39, third sealing seat; 40, second grate teeth; 41, second sealing seat; 42, process chamber housing; 43, driving gear; 44, process chamber oil return port; 45, drive shaft support bearing; 46, front clamping nut; 47, lip seal assembly; 48, drive shaft; 49, coupling; 50, test chamber; 51, process chamber; 52, front heating chamber; 53, mixing chamber; 54, front grate teeth sealing chamber. DETAILED DESCRIPTION

[0018] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0019] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0020] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides a single rotor bearing cavity comprehensive simulation test device, including a test chamber 50, a process chamber 51, a front heating chamber 52, a mixing chamber 53 and a normal temperature air supply channel 12. The test chamber 50 and the process chamber 51 are spaced apart and are not connected to each other; the front heating chamber 52 is provided with a heating chamber inlet, a first heating chamber outlet and a second heating chamber outlet, the heating chamber inlet is connected to the high temperature air supply port 15, and the first heating chamber outlet is connected to the test chamber 50; the mixing chamber inlet is connected to the second heating chamber outlet, and the mixing chamber outlet is connected to the mixing chamber vent 13; the first outlet of the normal temperature air supply channel is connected to the mixing chamber 53, and the second outlet of the normal temperature air supply channel 12 is connected to the process chamber 51.

[0021] The present invention can simulate the working conditions close to those of the engine bearing cavity, realize the temperature simulation of the sealed cavity through high-temperature air supply, and use electric heating to accurately control the temperature simulation of the bearing cavity periphery. Various types of thermal insulation structures reduce the temperature exchange between different cavities, and realize the establishment and coordination of different temperature test conditions in multiple areas.

[0022] Among them, the test chamber 50 is a complete chamber composed of the bearing seat 33, the rear cover 34, the rear rotor 29 and the graphite seal, and the process chamber 51 is a complete chamber composed of the process chamber shell 42, the process chamber shell cover 6, the rear rotor 29 and the grate seal structure.

[0023] It should be noted that the embodiment of the present invention also includes a spindle rotor system, a drive shaft system, a sealing system, a support structure, a supply / return oil / ventilation system, and a heating and testing system.

[0024] The main shaft rotor system consists of the main shaft 8 and the rear rotor 29. The front end of the main shaft rotor system is connected to the slip ring induction device 2 via the first flexible coupling 3. The main shaft 8 is mounted with the first grate 4, the driven gear 7, the front pressure nut 46, the front fulcrum bearing 11, the second grate 40, and the third grate 38. The rear rotor is mounted with the end cover 28, the fourth grate 20, the graphite sealing runway 26, the oil guide ring 30, the test bearing 32, and the pressure nut 31. The outer ring of the test bearing 32 is restrained by the pressure sleeve 25. The drive shaft system consists of the drive shaft 48, the drive shaft support bearing 45, the driving gear 43, and the coupling 49.

[0025] The sealing system consists of the grate teeth on the main shaft, the graphite sealing runway 26 and the corresponding sealing seat on the stator structure. The main shaft stator sealing seat includes the first sealing seat 5, the second sealing seat 41, the third sealing seat 39, the fourth sealing seat 19 and the graphite sealing assembly 24. The dynamic seal of the drive shaft is realized by the lip seal assembly 47.

[0026] The supporting structure includes the fuse housing 1, the front casing 14, the rear casing 16, and the support base 18; the fuse housing 1, the front casing 14, the rear casing 16, and the support base 18 are connected by bolts, and the bottom of the supporting structure is supported by the front support 37 and the rear support 36.

[0027] The rear casing 16 and the support base 18 jointly support the test chamber 50. The front casing 14 is fixedly connected to the rear casing 16, and the front casing 14 is used to support the process chamber 51. The front support 37 is connected to the rear casing 16, and the rear support 36 is connected to the rear casing 16 and the support base 18.

[0028] The supply / oil return / ventilation system is connected to an external air source through the high-temperature air supply port 15 and the normal-temperature air supply flow channel 12. The supply / oil return / ventilation system realizes oil supply through the process chamber nozzle 10 and the bearing chamber nozzle 27. The supply / oil return / ventilation system realizes oil return by connecting to an external oil return device through the process chamber oil return port 44 and the oil return pipe 35. Ventilation is realized by the process chamber vent 9, the mixing chamber vent 13 and the ventilation oil supply pipe 17, where the ventilation oil supply pipe 17 represents two pipelines of the same cross-section.

[0029] It should be noted that the test chamber 50 and the process chamber 51 in the embodiment of the present invention can use one or two sets of lubricating oil systems to supply oil according to the test requirements. Lubricating oil is supplied through each nozzle for lubrication and cooling to ensure the normal operation of the main shaft and drive shaft fulcrum bearings. The lubricating oil is recovered from the return oil pipe 35 and the process chamber return oil port 44. The independent supply and return oil interfaces enable the test device to meet a variety of test working conditions.

[0030] The heating and testing system primarily includes an electric heating hood 23, a test lead port 22, and a slip ring lead 2. Measurements of the remaining stator components can be achieved through the test lead port, vents, or holes punched in the cavity wall. Furthermore, a thermal insulation layer 21 can be applied to the periphery of the structural components based on actual usage requirements.

[0031] This embodiment of the present invention also includes a front grate sealing chamber 54, and the normal temperature air supply passage 12 also includes a third outlet for the normal temperature air supply passage, which is connected to the front grate sealing chamber 54. A portion of the cooling air entering from the normal temperature air supply passage 12 flows through the shaft center, forming a sealing pressure in the front grate sealing chamber 54. Simultaneously, the cooling air flows through the flow channel inside the front rotor shaft of the main shaft 8 for cooling, reducing heat transfer to the front end and ensuring that the slip ring induction device 2 is within the normal operating temperature range. The shaft center cooling structure keeps the front end test device within the normal operating range.

[0032] According to actual use requirements, a heat insulation layer 21 can be coated on the periphery of the sealing seat, pipelines and other structural parts to reduce temperature loss or heat exchange between cavities.

[0033] The process chamber 51 is equipped with a main shaft 8 and a drive shaft 48, which are connected by gears. The end of the main shaft 8 away from the test chamber 50 is connected to the slip ring inlet 2 via a first flexible coupling 3. The front end of the main shaft 8 is connected to the slip ring inlet 2 via the first flexible coupling 3. The test lead in the test chamber extends from the front rotor axis of the main shaft 8 and is connected to the slip ring inlet 2 to achieve high-speed rotor rotation signal output. The remaining stator components can be measured through the test lead port, ventilation port, or perforation in the chamber wall. During the test process, the inlet test conditions can be adjusted in real time based on the pressure and temperature measurements of each chamber, ultimately achieving the optimal input match.

[0034] The drive shaft 48 is connected to the drive motor at one end away from the test chamber 50 via a second flexible coupling 49. This second flexible coupling 49 can compensate for the height difference in thermal expansion caused by the high temperature section of the test and realize the main shaft rotor drive through the gear.

[0035] The embodiments of the present invention have the following beneficial effects:

[0036] 1. This invention can simulate operating conditions close to those of an engine bearing cavity. High-temperature air supply is used to simulate the sealing cavity temperature, and electric heating is used to precisely control the bearing cavity peripheral temperature. Multiple types of thermal insulation structures reduce temperature exchange between different cavities, enabling the establishment and coordination of test conditions with different temperatures in multiple regions.

[0037] 2. Rotor temperature measurement is achieved through the slip ring induction device, and the actual structure of the engine bearing cavity is preserved using the adapter gear structure. At the same time, various data such as wall temperature, cavity temperature, cavity pressure distribution, and lubricating oil supply and return oil temperatures can be obtained under simulated multiple working conditions.

[0038] 3. The test chamber and process chamber are isolated by bleed air cooling and a multi-stage grate seal throttling structure, ensuring the safety of the process chamber. The axis cooling structure allows the front-end test device to operate within the normal working range, ensuring the normal operation and measurement of the test bearing chamber in a wide temperature range.

[0039] 4. The test chamber and process chamber can use one or two sets of lubricating oil systems to supply oil according to the test requirements. The independent chamber and multi-port structure enable the test device to meet the simulation requirements of various test conditions.

[0040] 5. A high-temperature area support structure that matches the center of gravity position is adopted, and a flexible coupling is used to compensate for the thermal expansion height difference caused by the high-temperature section of the test, thereby avoiding thermal stress concentration in the support structure at high temperatures and ensuring the feasibility of large temperature gradient test simulation.

[0041] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A single rotor bearing cavity comprehensive simulation test device, characterized in that: include: The test chamber (50) and the process chamber (51) are spaced apart and not connected to each other; A front heating chamber (52) is provided with a heating chamber inlet, a first heating chamber outlet, and a second heating chamber outlet, wherein the heating chamber inlet is connected to the high-temperature air supply port (15), and the first heating chamber outlet is communicated with the test chamber (50); A mixing chamber (53), wherein the mixing chamber inlet is communicated with the second outlet of the heating chamber, and the mixing chamber outlet is connected to the mixing chamber vent (13); A normal temperature gas supply channel (12), wherein a first outlet of the normal temperature gas supply channel is in communication with the mixing chamber (53), and a second outlet of the normal temperature gas supply channel (12) is in communication with the process chamber (51); A main shaft (8) and a drive shaft (48) are provided in the process chamber (51), and the main shaft (8) and the drive shaft (48) are connected via gears; A first flexible coupling (3) and a slip ring energizer (2), and an end of the main shaft (8) away from the test cavity (50) is connected to the slip ring energizer (2) through the first flexible coupling (3); A second flexible coupling (49) and a driving motor, wherein the driving shaft (48) and one end away from the test chamber (50) are connected to the driving motor via the second flexible coupling (49); The oil supply pipe, the oil return pipe (35) and the ventilation pipe are all communicated with the test chamber (50).

2. The single rotor bearing cavity comprehensive simulation test device according to claim 1 is characterized in that: The single rotor bearing cavity comprehensive simulation test device further comprises a front grate sealing cavity (54), and the normal temperature air supply passage (12) further comprises a third outlet of the normal temperature air supply passage, wherein the third outlet of the normal temperature air supply passage is in communication with the front grate sealing cavity (54).

3. The single rotor bearing cavity comprehensive simulation test device according to claim 1 is characterized in that: An electric heating cover (23) for heating the test cavity (50) is provided outside the test cavity (50).

4. The single rotor bearing cavity comprehensive simulation test device according to claim 1 is characterized in that: The single rotor bearing cavity comprehensive simulation test device further comprises a front casing (14), a rear casing (16) and a support seat (18), wherein the rear casing (16) and the support seat (18) jointly support the test cavity (50), the front casing (14) is fixedly connected to the rear casing (16), and the front casing (14) is used to support the process cavity (51).

5. The single rotor bearing cavity comprehensive simulation test device according to claim 4 is characterized in that: The single rotor bearing cavity comprehensive simulation test device further comprises a front support (37) and a rear support (36), wherein the front support (37) is connected to the rear casing (16), and the rear support (36) is connected to the rear casing (16) and the support seat (18).

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