A dual-shaft dual-duct compressor tester structure with high and low pressure shafts on the same side

Abstract

The application provides a high-low pressure shaft same-side input double-shaft double-duct pressure turbine tester structure, comprising: an air inlet system arranged at the front side of a double-shaft test piece; an inner-outer duct exhaust system respectively connected with the inner-outer ducts of the double-shaft test piece; a high pressure shaft power system and a low pressure shaft power system, both arranged at the rear side of the double-shaft test piece; a first speed increaser for increasing the speed of the high pressure shaft power system and the low pressure shaft power system, comprising a high pressure shaft first speed increaser and a low pressure shaft first speed increaser; a coaxial transmission gear box with an outer shaft and an inner shaft, the high pressure shaft power system and the low pressure shaft power system are respectively connected to the outer shaft and the inner shaft of the coaxial transmission gear box through the high pressure shaft first speed increaser and the low pressure shaft first speed increaser, and the outer shaft and the inner shaft of the coaxial transmission gear box are respectively connected to the high pressure shaft system and the low pressure shaft system of the double-shaft test piece to drive the high pressure rotor and the low pressure rotor of the double-shaft test piece.

Description

Technical Field

[0001] This application belongs to the field of compressor testing, and specifically relates to a structure of a biaxial double-baffle compressor tester with high and low pressure shafts input on the same side. Background Technology

[0002] Compressor test chambers are crucial experimental equipment for verifying and optimizing the performance of aero-engine compression components. Currently, most compressor test chambers used in aero-engine development are single-rotor test chambers, meaning they can only conduct performance tests on the fan, fan / booster stage, and high-pressure compressor independently. Due to differences in intake, exhaust, and other environmental conditions, single-rotor tests cannot accurately simulate the actual operating state of the compressor on the engine, resulting in discrepancies between single-rotor test results and the compressor's actual performance on the engine. This discrepancy can be addressed through dual-rotor compressor testing. Therefore, dual-shaft dual-bypass compressor test chambers are key equipment for studying the aerodynamic performance of engine compression systems. Dual-rotor compressor test chambers can simulate the actual operating state of the entire engine compression system, enabling studies on the matching of high and low pressure compressors, transient performance, and performance evaluation, playing a vital role in aero-engine development. Existing dual-shaft dual-bypass compressor test chambers mostly feature a structure where the high and low pressure drive shafts input from both the intake and exhaust directions, referred to as a shaft-input structure.

[0003] like Figure 1 The diagram shows the structure of a high-power twin-shaft twin-duct compressor tester with dual-rotor testing capabilities. The low-pressure power system 12 and high-pressure power system 18 of the dual rotors are arranged at both ends of the test equipment. The drive shaft on the low-pressure side passes through the inlet volute 14 and connects to the low-pressure shaft speed increaser 13 and the low-pressure power system 12. The drive shaft on the high-pressure side passes through the exhaust volute 15 and connects to the high-pressure shaft speed increaser 16 and the high-pressure power system 18. Since the low-pressure shaft system and power system occupy the axial intake position of the tester, the tester's intake system 11 is split into two pipelines. At the test specimen inlet, the intake airflow is merged by the inlet volute 14 and converted from radial to axial exhaust. The axial force of the fan rotor is borne by its own thrust bearing; the high-pressure rotor can use the balance disc 16 to balance part of the axial force, and the remaining axial force is borne by the high-pressure rotor's main bearing bearing.

[0004] However, the testing apparatus of this structure has the following drawbacks:

[0005] 1) The uniformity of the intake airflow field is difficult to guarantee, which introduces deviations to the actual working state of the simulated compressor on the engine;

[0006] 2) Due to space limitations, it is relatively difficult to realize some testing functions such as intake pressure and temperature distortion testing, or it requires a larger axial space to realize the above functions;

[0007] 3) The structure of the biaxial test piece differs greatly from that of the engine compression components, resulting in poor interchangeability of its key components. A completely new test piece adapted to the shaft power input form of the dual rotor tester structure is required, and the investment is substantial. Summary of the Invention

[0008] The purpose of this application is to provide a biaxial double-baffle compressor tester structure with high and low pressure shaft inputs on the same side, in order to solve or mitigate at least one of the problems in the prior art.

[0009] The technical solution of this application is: a test structure for a biaxial double-blowback compressor with high and low pressure shafts input on the same side, comprising:

[0010] The intake system, located at the front of the biaxial test specimen, is used to provide the engine with the required air for the biaxial test specimen;

[0011] The inner and outer duct exhaust system is connected to the inner and outer ducts of the biaxial test specimen respectively, and is used to exhaust the gas in the inner and outer ducts of the biaxial test specimen;

[0012] A high-pressure shaft power system and a low-pressure shaft power system are used to drive the low-pressure shaft system and the high-pressure shaft system of the biaxial test piece respectively, and both the high-pressure shaft power system and the low-pressure shaft power system are located on the rear side of the biaxial test piece.

[0013] A first-stage speed increaser for increasing the speed of a high-pressure shaft power system and a low-pressure shaft power system, the first-stage speed increaser including a high-pressure shaft first-stage speed increaser and a low-pressure shaft first-stage speed increaser;

[0014] A coaxial transmission gearbox with an outer shaft and an inner shaft is provided. The high-pressure shaft power system and the low-pressure shaft power system are respectively connected to the outer shaft and the inner shaft of the coaxial transmission gearbox through a high-pressure shaft first-stage speed increaser and a low-pressure shaft first-stage speed increaser, respectively. The outer shaft and the inner shaft of the coaxial transmission gearbox are respectively connected to the high-pressure shaft system and the low-pressure shaft system of the dual-shaft test piece, thereby realizing the power transmission of the high-pressure shaft power system and the low-pressure shaft power system to the high-pressure rotor and the low-pressure rotor of the dual-shaft test piece.

[0015] In a preferred embodiment of this application, both the inner and outer shafts of the coaxial transmission gearbox are speed-increasing gear shafts, forming a two-stage speed-increasing transmission system through the coaxial transmission gearbox and a single-stage speed increaser.

[0016] In a preferred embodiment of this application, the first-stage speed increaser is an input-output eccentric shaft structure, and the eccentric direction is the direction that can increase the interval between the power-side input shafts of the two first-stage speed increasers.

[0017] In a preferred embodiment of this application, the two shaft systems at the power input end of the coaxial transmission gearbox converge into a single nested inner and outer concentric shaft. The inner shaft of the coaxial transmission gearbox is supported by an inter-shaft bearing and connected to the low-pressure shaft system of the biaxial test piece via a floating shaft. The outer shaft of the coaxial transmission gearbox is connected to the high-pressure shaft system of the biaxial test piece via a diaphragm coupling.

[0018] In a preferred embodiment of this application, a balance disc is provided on the side of the coaxial transmission gearbox away from the biaxial test piece, and the balance disc is connected to the inner shaft power output end of the coaxial transmission gearbox via a tie rod.

[0019] In a preferred embodiment of this application, the balance disc is pneumatically loaded to balance the axial force of the low-pressure rotor.

[0020] The biaxial, dual-blowback compressor test apparatus structure with high and low pressure shaft inputs on the same side provided in this application has the following advantages:

[0021] 1) The intake system 21 can adopt a conventional single-axis compressor tester scheme to ensure a more uniform intake airflow field during steady-state testing and a more convenient system layout during distortion testing. As a result, the flow field quality is easier to guarantee and the simulation of the engine inlet flow field is also easier.

[0022] 2) By making full use of the existing hardware testing resources of engine compression components, a coaxial dual-rotor test piece can be formed by making minor modifications to the overall compression system structure. Performance tests can be carried out on a dual-axis test platform, which can achieve axial force balance of low-pressure rotor components and greatly reduce the design and processing costs of the test piece.

[0023] 3) The intake system 21 can reserve enough expansion space to supplement special testing equipment such as intake distortion, heating, and pressurization, and carry out various functional test items, thus expanding the function of the dual rotor tester;

[0024] 4) The biaxial tester can perform both dual-rotor tests and single-rotor compressor performance tests, improving the interchangeability of single-rotor and dual-rotor compressor testing functions and the utilization rate of the tester;

[0025] 5) The structure of the testing equipment is more compact, reducing the floor space occupied by the testing equipment and lowering the construction cost of the testing equipment. Attached Figure Description

[0026] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0027] Figure 1 This is a schematic diagram of the existing dual-rotor compressor test apparatus.

[0028] Figure 2 This is a schematic diagram of the structure of the biaxial double-baffle compressor test apparatus of this application.

[0029] Figure 3 This is a schematic diagram of the coaxial input shaft system for the biaxial double-baffle compressor test apparatus applied for.

[0030] Figure 4 This is a schematic diagram of the internal and external shaft connections of the biaxial double-baffle compressor test apparatus for which the application was submitted. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0032] To address the problems of complex air intake system layout and difficulty in guaranteeing air intake quality in existing dual-rotor compressor testers with shaft-connected transmission systems, this application proposes a dual-rotor compressor tester structure with coaxial high and low pressure inputs.

[0033] like Figures 2 to 4 As shown, the dual-rotor compressor tester structure with high and low pressure shafts input on the same side provided in this application includes an intake system 21, an inner and outer bypass exhaust system 22, a coaxial transmission gearbox 23, a first-stage speed increaser 24, a high-pressure shaft power system 25, and a low-pressure shaft power system 26.

[0034] The intake system 21 is located on the front side of the biaxial test specimen 30 and is used to provide the engine with the required air for the biaxial test specimen 30.

[0035] The inner and outer duct exhaust systems 22 are respectively connected to the inner and outer ducts of the biaxial test specimen 30 and are used to exhaust the gas from the inner and outer ducts.

[0036] The high-pressure shaft power system 25 and the low-pressure shaft power system 26 are simultaneously located on the rear side of the biaxial test piece 30. The first-stage speed increaser 24 includes a high-pressure shaft first-stage speed increaser 241 and a low-pressure shaft first-stage speed increaser 242. The high-pressure shaft power system 25 and the low-pressure shaft power system 26 are respectively transmitted to the coaxial transmission gearbox 23 through the high-pressure shaft first-stage speed increaser 241 and the low-pressure shaft first-stage speed increaser 242. The coaxial transmission gearbox 23 has an outer shaft and an inner shaft, which are respectively connected to the high-pressure shaft system and the low-pressure shaft system of the biaxial test piece 30, thereby transmitting the power transmitted by the high-pressure shaft power system 25 and the low-pressure shaft power system 26 to the high-pressure rotor 32 and the low-pressure rotor 31 through the high-pressure shaft and the low-pressure shaft.

[0037] In this application, both the inner and outer shafts of the coaxial transmission gearbox 23 are speed-increasing gear shafts. The coaxial transmission gearbox 23 and the first-stage speed increaser 24 form a two-stage speed-increasing transmission system. The operating speed range of the high / low pressure shaft power system is not limited, which can meet the speed increase requirements of the tester at higher speeds.

[0038] Furthermore, the first-stage speed increaser 24 adopts an input-output eccentric shaft structure, which increases the interval between the two input shafts on the power side, thereby reserving sufficient space for the installation of high / low pressure shaft power systems.

[0039] In this application, the coaxial transmission gearbox 23 with a speed-increasing gear structure can further increase the output speed of the high / low pressure shafts, while simultaneously converging the two shaft systems at the power input end into a single nested concentric shaft, which is directly connected to the dual-shaft test piece 30 via a connection interface. The inner shaft of the coaxial transmission gearbox 23 and the low-pressure shaft system of the dual-shaft test piece 30 are supported by inter-shaft bearings and connected by a floating shaft 34 with sleeve teeth. The alignment of the two shaft systems only requires ensuring the concentricity of the outer shaft; the concentricity of the inner shaft is ensured by their respective installation processes. The two ends of the floating shaft 34 have sleeve teeth, which connect to the low-pressure shaft system of the dual-shaft test piece 30 and the inner shaft of the coaxial transmission gearbox 23, respectively. The floating shaft 34 can transmit torque and absorb misalignment and axial thermal expansion.

[0040] The coaxial transmission gearbox 23 is connected to the high-pressure shaft system of the biaxial test piece through the diaphragm coupling 33. The design parameters of the diaphragm coupling 33 are determined according to the axial deformation and concentricity requirements that the high-pressure shaft needs to absorb.

[0041] The above-described structure of this application can also achieve free switching between single / dual axis input modes. In single axis mode, the outer shaft of the coaxial transmission gearbox 23 can be connected to the shaft system of the test piece.

[0042] In a preferred embodiment of this application, a balance disc 27 is provided on the side of the coaxial transmission gearbox 23 away from the biaxial test piece 30. The balance disc 27 is installed at the input end of the coaxial transmission gearbox 23 and connected to the inner shaft power output end of the coaxial transmission gearbox 23 via a tie rod 271, thereby connecting it to the low-pressure rotor 31 of the biaxial test piece 30 and the balance disc shaft. The balance disc 27 is pneumatically loaded, relying on the air pressure difference on both sides of the balance disc 27 to generate an axial force towards the power input side, thereby reducing the axial force borne by the fan rotor thrust bearing.

[0043] The biaxial, dual-blowback compressor test apparatus structure with high and low pressure shaft inputs on the same side provided in this application has the following advantages:

[0044] 1) The intake system 21 can adopt a conventional single-axis compressor tester scheme to ensure a more uniform intake airflow field during steady-state testing and a more convenient system layout during distortion testing. As a result, the flow field quality is easier to guarantee and the simulation of the engine inlet flow field is also easier.

[0045] 2) By making full use of the existing hardware testing resources of engine compression components, a coaxial dual-rotor test piece can be formed by making minor modifications to the overall compression system structure. Performance tests can be carried out on a dual-axis test platform, which can achieve axial force balance of low-pressure rotor components and greatly reduce the design and processing costs of the test piece.

[0046] 3) The intake system 21 can reserve enough expansion space to supplement special testing equipment such as intake distortion, heating, and pressurization, and carry out various functional test items, thus expanding the function of the dual rotor tester;

[0047] 4) The biaxial tester can perform both dual-rotor tests and single-rotor compressor performance tests, improving the interchangeability of single-rotor and dual-rotor compressor testing functions and the utilization rate of the tester;

[0048] 5) The structure of the testing equipment is more compact, reducing the floor space occupied by the testing equipment and lowering the construction cost of the testing equipment.

[0049] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A test structure for a biaxial, double-blowback compressor with high and low pressure shafts input on the same side, characterized in that, include: An intake system (21) is provided at the front of the biaxial test piece (30) to provide the engine with the required air for the biaxial test piece (30); The inner and outer duct exhaust system (22) is connected to the inner and outer ducts of the biaxial test piece (30) respectively, and is used to exhaust the gas in the inner and outer ducts of the biaxial test piece (30); The high-pressure shaft power system (25) and the low-pressure shaft power system (26) are used to drive the high-pressure shaft system and the low-pressure shaft system of the biaxial test piece (30) respectively. The high-pressure shaft power system (25) and the low-pressure shaft power system (26) are both located on the rear side of the biaxial test piece (30). A first-stage speed increaser (24) is used to increase the speed of the high-pressure shaft power system (25) and the low-pressure shaft power system (26). The first-stage speed increaser (24) includes a high-pressure shaft first-stage speed increaser (241) and a low-pressure shaft first-stage speed increaser (242). The first-stage speed increaser (24) has an input-output eccentric shaft structure, and the eccentric direction is the direction that can increase the interval between the power-side input shafts of the two first-stage speed increasers. A coaxial transmission gearbox (23) with an outer shaft and an inner shaft is provided. The high-pressure shaft power system (25) and the low-pressure shaft power system (26) are connected to the outer shaft and inner shaft of the coaxial transmission gearbox (23) respectively through a high-pressure shaft first-stage speed increaser (241) and a low-pressure shaft first-stage speed increaser (242). The outer shaft and inner shaft of the coaxial transmission gearbox (23) are connected to the high-pressure shaft system and the low-pressure shaft system of the dual-shaft test piece (30) respectively, so as to realize the power transmission of the high-pressure shaft power system (25) and the low-pressure shaft power system (26) to the high-pressure rotor (32) and the low-pressure rotor (31) of the dual-shaft test piece (30). The two shaft systems at the power input end of the coaxial transmission gearbox are combined into a nested inner and outer shaft concentric shaft. The inner shaft and the outer shaft of the coaxial transmission gearbox (23) are both speed-increasing gear shafts. The coaxial transmission gearbox (23) and the first-stage speed increaser (24) form a two-stage speed-increasing transmission system. The inner shaft of the coaxial transmission gearbox (23) is a speed-increasing gear shaft. The low-pressure shaft system of the biaxial test piece (30) is supported by inter-shaft bearings and connected by a floating shaft (34) with sleeve teeth. The alignment of the inner shaft of the coaxial transmission gearbox (23) and the low-pressure shaft system of the biaxial test piece (30) is only ensured by the concentricity of the outer shaft, while the concentricity of the inner shaft is ensured by their respective installation processes. The two ends of the floating shaft (34) are sleeve teeth, which are respectively connected to the low-pressure shaft system of the biaxial test piece (30) and the inner shaft of the coaxial transmission gearbox (23) with sleeve teeth. The floating shaft (34) is used to transmit torque and absorb misalignment and axial thermal expansion; the coaxial transmission gearbox (23) is connected to the high-pressure shaft system of the biaxial test piece through a diaphragm coupling (33), and the design parameters of the diaphragm coupling (33) are determined according to the axial deformation and concentricity requirements to be absorbed by the high-pressure shaft system; it can also achieve free switching between single / dual-axis input modes, and in single-axis mode, the outer shaft of the coaxial transmission gearbox (23) can be connected to the shaft system of the biaxial test piece; and The balance disc (27) is located on the side of the coaxial transmission gearbox (23) away from the biaxial test piece (30). The balance disc (27) is connected to the inner shaft power output end of the coaxial transmission gearbox (23) via a tie rod (271). The balance disc (27) is pneumatically loaded to balance the axial force of the low-pressure rotor.

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