Two-stage contra-rotating fan test piece structure driven at same end

Abstract

The invention belongs to the field of fan part tests, and particularly relates to a same-end-driven two-stage counter-rotating fan test piece structure. The structure comprises an air inlet casing assembly, a rotor assembly, a stator assembly and an exhaust casing assembly. According to the same-end-driven two-stage contra-rotating fan test piece structure, on the basis of meeting pneumatic design, fan test piece structure design is carried out, including component connection scheme design, force transmission route scheme design, support scheme design, fulcrum scheme design, test scheme design and the like; and a low-risk, rapid and convenient test piece is provided for fan component performance analysis.

Description

Technical Field

[0001] This application belongs to the field of fan component testing, and specifically relates to a test piece structure for a two-stage counter-rotating fan driven from the same end. Background Technology

[0002] Testing of aero-engine fan components is a crucial step in ensuring engine performance and safety. It verifies the design rationality, manufacturing reliability, and performance of fan components in real-world operating environments. Through testing, key indicators such as aerodynamic performance, structural strength, vibration characteristics, and material properties of the fan components can be evaluated, ensuring that the fan components meet the engine's design requirements and operational needs.

[0003] Traditional fan component characteristic testing heavily relies on full engine testing, requiring the manufacture of a complete engine prototype and the construction of a corresponding full engine test stand. This results in high testing costs and long testing cycles, making it unsuitable for the rapid iterative development needs of modern aero engines. Furthermore, in a full engine environment, extracting fan component characteristics from full engine test data becomes extremely difficult, hindering accurate evaluation of the fan component's design merits.

[0004] Therefore, there is a need for a technical solution to overcome or mitigate at least one of the aforementioned defects in the prior art. Summary of the Invention

[0005] The purpose of this application is to provide a test specimen structure for a two-stage counter-rotating fan driven at the same end, in order to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is: A test specimen structure for a two-stage counter-rotating fan driven at the same end includes: The intake casing assembly includes a measuring casing, a front load-bearing casing, a cap, a bearing casing, and inlet guide vanes; The front bearing housing is connected to the measuring housing. Multiple first multi-functional support plates are installed on the front bearing housing. A portion of the first multi-functional support plates have oil channels, and another portion of the first multi-functional support plates have airflow channels. The first multi-functional support plates are provided with inner rings. The front bearing housing is also equipped with a guide vane adjustment mechanism. The cap is connected to the inner ring of the first multifunctional support plate; The bearing housing is connected to the inner ring of the first multi-functional support plate and the cap cover respectively. The bearing housing is provided with a first support bearing mounting part. The bearing housing is provided with an oil passage and an airflow passage. The inlet guide vane is connected to the guide vane adjustment mechanism, and an inner ring of the guide vane is provided on the inlet guide vane; Rotor assembly, including primary rotor and secondary rotor; The first-stage rotor is located at the rear of the intake casing assembly, and the second-stage rotor is located at the rear of the first-stage rotor. Both the first-stage rotor and the second-stage rotor are connected to the power unit. Stator assembly, including primary stator and secondary stator; The primary stator is located between the primary rotor and the secondary rotor, and is connected to the front load-bearing casing; the secondary stator is located at the rear of the secondary rotor, and is connected to the primary stator. An exhaust casing assembly is located behind the secondary stator and is connected to the secondary stator.

[0007] In at least one embodiment of this application, the primary rotor includes a primary integral impeller and a primary fan shaft. A first primary integral impeller connecting portion and a second primary integral impeller connecting portion are provided on the radially inner side of the primary integral impeller. A second fulcrum bearing mounting portion is provided on the first primary integral impeller connecting portion, and a fulcrum bearing assembly is mounted on the second fulcrum bearing mounting portion in cooperation with the first fulcrum bearing mounting portion. One end of the primary fan shaft is connected to the second primary integral impeller connecting portion, and the other end is connected to the power device. A first inter-shaft fulcrum bearing mounting portion is provided on the primary fan shaft. The secondary rotor includes a secondary integral impeller and a secondary fan shaft. A secondary integral impeller connecting part is provided on the radially inner side of the secondary integral impeller. One end of the secondary fan shaft is connected to the secondary integral impeller connecting part, and the other end is connected to the power device through a transmission shaft. The secondary fan shaft is provided with a two-point bearing mounting part, a second inter-shaft bearing mounting part, and a three-point bearing mounting part. The second inter-shaft bearing mounting part cooperates with the first inter-shaft bearing mounting part to install the inter-shaft bearing assembly.

[0008] In at least one embodiment of this application, the first-stage stator includes a first-stage stator casing and first-stage stator blades. The first-stage stator casing is connected to the front load-bearing casing, and a first-stage stator blade adjustment mechanism is installed on the first-stage stator casing. The first-stage stator blades are connected to the first-stage stator blade adjustment mechanism, and a first-stage inner ring is provided on the first-stage stator blades. The secondary stator includes a secondary stator casing and secondary stator blades. The secondary stator casing is connected to the primary stator casing. The secondary stator blades are connected to the secondary stator casing, and a secondary inner ring is provided on the secondary stator blades.

[0009] In at least one embodiment of this application, the exhaust casing assembly includes a rear load-bearing casing, a two-point bearing housing, a bearing casing cylinder, and a three-point bearing housing. The rear load-bearing casing is connected to the secondary stator casing. Multiple second multi-functional support plates are installed on the rear load-bearing casing, and a second multi-functional support plate inner ring is provided on the second multi-functional support plate. The two-point bearing housing is connected to the inner ring of the second multi-functional support plate. The two-point bearing housing is provided with a two-point sealing seat. The two-point bearing housing, the two-point sealing seat and the two-point bearing mounting part are used to install the two-point bearing assembly. The bearing housing is mounted on the second multi-functional support plate, and the bearing housing is provided with an oil passage and an airflow passage. The three-point bearing housing is connected to the inner ring of the second multi-functional support plate. A three-point sealing seat is provided on the three-point bearing housing. The three-point bearing housing, the three-point sealing seat, and the three-point bearing mounting part cooperate to install the three-point bearing.

[0010] In at least one embodiment of this application, a support point sealing seat is provided on the first support point bearing mounting portion; The fulcrum bearing assembly includes a fulcrum clamping nut, a fulcrum bearing, and a fulcrum sealing ring. The fulcrum bearing and the fulcrum sealing ring are installed on the second fulcrum bearing mounting part by means of the fulcrum clamping nut. The fulcrum sealing ring cooperates with the fulcrum sealing seat to achieve the sealing of the fulcrum bearing.

[0011] In at least one embodiment of this application, an inter-shaft sealing seat is provided on the second inter-shaft pivot bearing mounting portion; The inter-shaft pivot bearing assembly includes an inter-shaft sealing ring, an inter-shaft pivot bearing, and an inter-shaft pivot clamping nut. The inter-shaft pivot bearing and the inter-shaft sealing ring are installed on the first inter-shaft pivot bearing mounting part by the inter-shaft pivot clamping nut. The inter-shaft sealing ring cooperates with the inter-shaft sealing seat to achieve the sealing of the inter-shaft pivot bearing. The secondary fan shaft is also equipped with an inter-shaft support oil supply nozzle for supplying oil to the inter-shaft support bearing.

[0012] In at least one embodiment of this application, the two-point bearing assembly includes a two-point sealing ring, a two-point bearing, and a two-point clamping nut. The two-point bearing is mounted on the two-point bearing mounting part by means of the two-point clamping nut. The two-point sealing ring cooperates with the two-point sealing seat to achieve sealing of the two-point bearing.

[0013] In at least one embodiment of this application, the measuring housing, the primary stator housing, the secondary stator housing, and the rear load-bearing housing are all provided with multiple test interfaces.

[0014] In at least one embodiment of this application, a first sealing structure is provided between the inner ring of the guide vane and the connection portion of the first stage integral bladed disk; A second sealing structure is provided between the primary fan shaft and the primary inner ring; A third sealing structure is provided between the secondary integral bladed disk connection and the primary inner ring; A fourth sealing structure is provided between the secondary integral bladed disk connection part and the secondary inner ring; A fifth sealing structure is provided between the secondary integral bladed disk connection and the two-point sealing seat.

[0015] The invention has at least the following beneficial technical effects: The same-end driven two-stage counter-rotating fan test specimen structure of this application, based on the aerodynamic design, carries out the fan test specimen structure design, including component connection scheme design, force transmission route scheme design, support scheme design, fulcrum scheme design, test scheme design, etc., to provide a low-risk, fast and convenient test specimen for fan component performance analysis. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a test piece of a two-stage counter-rotating fan driven at the same end according to one embodiment of this application; Figure 2 This is a schematic diagram of an intake casing assembly according to one embodiment of this application; Figure 3 This is a schematic diagram of a rotor assembly according to one embodiment of this application; Figure 4 This is a schematic diagram of a stator assembly according to one embodiment of this application; Figure 5 This is a schematic diagram of an exhaust casing assembly according to one embodiment of this application.

[0017] in: 1-Inlet casing assembly; 11-Measuring casing; 12-Front load-bearing casing; 13-Cap cover; 14-Bearing casing; 15-Inlet guide vane; 16-Inner ring of guide vane; 17-Guide vane adjustment mechanism; 2-Rotor assembly; 21-First stage integral impeller; 22-Single pivot point clamping nut; 23-Single pivot point bearing; 24-Single pivot point sealing ring; 25-First stage fan shaft; 26-Inter-shaft sealing ring; 27-Inter-shaft pivot point bearing; 28-Inter-shaft pivot point clamping nut; 29-Spline; 210-Power unit connection; 211-Second stage integral impeller; 212-Second pivot point sealing ring; 213-Second pivot point bearing; 214-Second pivot point clamping nut; 215-Second stage fan shaft; 216-Inter-shaft pivot point oil nozzle; 217-Third pivot point bearing; 218-Drive shaft; 219-Drive shaft clamping nut; 3-Stator assembly; 31-First-stage stator housing; 32-First-stage stator blade; 33-First-stage inner ring; 34-First-stage stator blade adjustment mechanism; 35-Second-stage stator housing; 36-Second-stage stator blade; 37-Second-stage inner ring; 4-Exhaust casing assembly; 41-Rear load-bearing casing; 42-Second multi-functional support plate; 43-Two-point bearing seat; 44-Two-point sealing seat; 45-Bearing casing cylinder; 46-Three-point bearing seat; 47-Three-point sealing seat. Detailed Implementation

[0018] 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. 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 this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this application.

[0020] The following is in conjunction with the appendix Figures 1 to 5 This application will be described in further detail.

[0021] This application provides a test specimen structure for a two-stage counter-rotating fan driven at the same end, such as... Figure 1 As shown, it includes: intake casing assembly 1, rotor assembly 2, stator assembly 3 and exhaust casing assembly 4.

[0022] Specifically, such as Figure 2 As shown, the intake casing assembly 1 includes a measuring casing 11, a front load-bearing casing 12, a cap 13, a bearing casing 14, and an inlet guide vane 15. The measuring casing 11 has multiple test ports; the front load-bearing casing 12 is connected to the measuring casing 11 and has multiple first multi-functional support plates, some of which have oil channels and others have airflow channels. Each first multi-functional support plate has an inner ring. The front load-bearing casing 12 also has a guide vane adjustment mechanism 17. The cap 13 is connected to the inner ring of the first multi-functional support plates. The bearing casing 14 is connected to both the inner ring of the first multi-functional support plates and the cap 13. The bearing casing 14 has a first fulcrum bearing mounting part and has oil channels and airflow channels. The inlet guide vane 15 is connected to the guide vane adjustment mechanism 17 and has an inner guide vane ring 16.

[0023] The dual-stage counter-rotating fan test specimen structure driven by the same end of this application, in the design of the inlet casing assembly 1, measures the inlet flow by setting various test interfaces on the measuring casing 11, and measures the data during the fan component performance test. Multiple fixedly distributed first multi-functional support plates on the front load-bearing casing 12 transmit the axial and radial loads of the rotor test specimen on one hand, and provide the lubricating oil and sealing gas required for the test specimen's operation on the other. The inner ring of the first multi-functional support plate, the cap 13, and the inner ring of the guide vanes 16 together form the internal flow path of the airflow. The bearing casing 14 integrates oil and gas channels for bearing lubrication and sealing, and also provides the bearing mounting position. Multiple rotatable and adjustable inlet guide vanes 15, driven by the guide vane adjustment mechanism 17, are adjusted in real time as needed during the test specimen's operation to meet different performance requirements.

[0024] like Figure 3As shown, rotor assembly 2 includes a primary rotor and a secondary rotor. The primary rotor is located behind the intake casing assembly 1, and the secondary rotor is located behind the primary rotor. Both the primary and secondary rotors are connected to the power unit. The primary rotor includes a primary integral impeller 21 and a primary fan shaft 25. The radially inner side of the primary integral impeller 21 has a first primary integral impeller connecting part and a second primary integral impeller connecting part. A second fulcrum bearing mounting part is provided on the first primary integral impeller connecting part, and a fulcrum bearing assembly is installed on the second fulcrum bearing mounting part in conjunction with the first fulcrum bearing mounting part. One end of the primary fan shaft 25 is connected to the second primary integral impeller connecting part, and the other end is connected to the power unit. A first inter-shaft fulcrum bearing mounting part is provided on the primary fan shaft 25.

[0025] In this embodiment, a spur bearing mounting part is provided with a spur sealing seat; the spur bearing assembly includes a spur clamping nut 22, a spur bearing 23 and a spur sealing ring 24. The spur bearing 23 and the spur sealing ring 24 are installed on the second spur bearing mounting part by the spur clamping nut 22. The spur sealing ring 24 cooperates with the spur sealing seat to achieve the sealing of the spur bearing 23.

[0026] The secondary rotor includes a secondary integral impeller 211 and a secondary fan shaft 215. A secondary integral impeller connecting part is provided on the radial inner side of the secondary integral impeller 211. One end of the secondary fan shaft 215 is connected to the secondary integral impeller connecting part, and the other end is connected to the power unit through a drive shaft 218. A two-point bearing mounting part, a second inter-shaft bearing mounting part, and a three-point bearing mounting part are provided on the secondary fan shaft 215. The second inter-shaft bearing mounting part cooperates with the first inter-shaft bearing mounting part to install the inter-shaft bearing assembly.

[0027] In this embodiment, an inter-shaft sealing seat is provided on the second inter-shaft pivot bearing mounting part; the inter-shaft pivot bearing assembly includes an inter-shaft sealing ring 26, an inter-shaft pivot bearing 27, and an inter-shaft pivot clamping nut 28. The inter-shaft pivot bearing 27 and the inter-shaft sealing ring 26 are installed on the first inter-shaft pivot bearing mounting part by the inter-shaft pivot clamping nut 28. The inter-shaft sealing ring 26 cooperates with the inter-shaft sealing seat to achieve the sealing of the inter-shaft pivot bearing 27; an inter-shaft pivot oil supply nozzle 216 for supplying oil to the inter-shaft pivot bearing 27 is also provided on the secondary fan shaft 215.

[0028] The experimental structure of the two-stage counter-rotating fan driven by the same end of this application comprises a first-stage integral impeller 21 and a first-stage fan shaft 25 connected as a whole by bolts and nuts. The power unit transmits power to the first-stage rotor through the spline 29 on the power unit connection part 210 at the end of the first-stage fan shaft 25. Supported by a spur bearing 23 and an inter-shaft spur bearing 27, the first-stage rotor rotates and performs work on the airflow. The spur sealing ring 24 seals the cavity of the spur bearing 23. The second-stage integral impeller 211 is connected to the second-stage fan shaft 215 as a whole by bolts and nuts. The drive shaft 218 is connected to the second-stage fan shaft 215 through a drive shaft clamping nut 219. The power unit transmits power to the second-stage rotor through the drive shaft 218. Supported by a second spur bearing 213 and a third spur bearing 217, the second-stage rotor rotates and performs work on the airflow, while simultaneously driving the inter-shaft spur oil nozzle 216 to lubricate the inter-shaft spur bearing 27. The inter-shaft sealing ring 26 seals the bearing cavity. Each clamping nut serves to stabilize the various support points. The power input for both the primary and secondary rotors is located at the same end, providing a convenient interface for the power unit.

[0029] like Figure 4 As shown, the stator assembly 3 includes a primary stator and a secondary stator. The primary stator is located between the primary and secondary rotors and is connected to the front support casing 12. The secondary stator is located behind the secondary rotor and is connected to the primary stator. The primary stator includes a primary stator casing 31 and primary stator blades 32. The primary stator casing 31 is connected to the front support casing 12, and a primary stator blade adjustment mechanism 34 is installed on the primary stator casing 31. The primary stator blades 32 are connected to the primary stator blade adjustment mechanism 34, and a primary inner ring 33 is provided on the primary stator blades 32. The secondary stator includes a secondary stator casing 35 and secondary stator blades 36. The secondary stator casing 35 is connected to the primary stator casing 31, and the secondary stator blades 36 are connected to the secondary stator casing 35. A secondary inner ring 37 is provided on the secondary stator blades 36. Both the primary stator casing 31 and the secondary stator casing 35 are provided with multiple test interfaces.

[0030] The dual-stage counter-rotating fan test specimen structure driven by the same end of this application includes a primary stator casing 31 with multiple rotatable and adjustable primary stator blades 32. Driven by a primary stator blade adjustment mechanism 34, the blades are adjusted in real time during the test specimen's operation to meet performance requirements under different conditions. A secondary stator casing 35 has multiple fixedly distributed secondary stator blades 36. The primary inner ring 33 and the secondary inner ring 37 form the internal airflow path. The primary and secondary stator casings 31 and 35 provide force transmission support for the test specimen and integrate various test interfaces for measuring data during fan component performance testing.

[0031] like Figure 5 As shown, the exhaust casing assembly 4 is located on the rear side of the secondary stator and is connected to the secondary stator. The exhaust casing assembly 4 includes a rear load-bearing casing 41, a two-point bearing housing 43, a bearing casing cylinder 45, and a three-point bearing housing 46. Among them, the rear load-bearing casing 41 is connected to the secondary stator casing 35, and multiple second multi-functional support plates 42 are installed on the rear load-bearing casing 41. The second multi-functional support plates 42 are provided with second multi-functional support inner rings. The two-point bearing housing 43 is connected to the inner ring of the second multi-functional support plate. The two-point bearing housing 43 is provided with a two-point sealing seat 44. The two-point bearing housing 43, the two-point sealing seat 44, and the two-point bearing mounting part cooperate to install the two-point bearing assembly. The bearing housing cylinder 45 is installed on the second multi-functional support plate 42. The bearing housing cylinder 45 is provided with a lubricating oil channel and an airflow channel. The three-point bearing housing 46 is connected to the inner ring of the second multi-functional support plate. The three-point bearing housing 46 is provided with a three-point sealing seat 47. The three-point bearing housing 46, the three-point sealing seat 47, and the three-point bearing mounting part cooperate to install the three-point bearing 217.

[0032] In this embodiment, the two-point bearing assembly includes a two-point sealing ring 212, a two-point bearing 213, and a two-point clamping nut 214. The two-point bearing 213 is installed on the two-point bearing mounting part by the two-point clamping nut 214, and the two-point sealing ring 212 cooperates with the two-point sealing seat 44 to achieve the sealing of the two-point bearing 213.

[0033] The dual-stage counter-rotating fan test specimen structure with co-drive in this application has a rear load-bearing casing 41 as the main load-bearing structure. Multiple fixedly distributed second multi-functional support plates 42 are provided. Loads generated in various directions by the rotor rotation are transmitted to the rear load-bearing casing 41 via the bearing mounting seats at each support point, and then to the base via the mounting section. The bearing casing 45 integrates oil and gas channels for bearing lubrication and sealing. Two-point sealing seats 44 and three-point bearing seats 46 cooperate with corresponding sealing rings to seal the bearing cavities at the support points. The rear load-bearing casing 41 integrates various test interfaces for measuring data during fan component performance testing.

[0034] The test structure of the two-stage counter-rotating fan driven by the same end in this application includes multiple sealing structures between the intake casing assembly 1, rotor assembly 2, stator assembly 3, and exhaust casing assembly 4. Specifically, a first sealing structure is provided between the inner ring 16 of the guide vanes and the connection part of the first-stage integral impeller; a second sealing structure is provided between the first-stage fan shaft 25 and the first-stage inner ring 33; a third sealing structure is provided between the connection part of the second-stage integral impeller and the first-stage inner ring 33; a fourth sealing structure is provided between the connection part of the second-stage integral impeller and the second-stage inner ring 37; and a fifth sealing structure is provided between the connection part of the second-stage integral impeller and the two-point sealing seat 44.

[0035] The dual-stage counter-rotating fan test piece structure of this application is powered by an external power unit (such as a motor) through the spline 29 on the first-stage rotor and the drive shaft 218 on the second-stage rotor, causing the first-stage and second-stage rotors to rotate synchronously in opposite directions. The blades on the first-stage integral bladed disk 21 and the second-stage integral bladed disk 211 perform work on the airflow. The airflow enters the flow channel from the inlet casing assembly 1, absorbs energy from the first-stage and second-stage rotors, and is then discharged through the exhaust casing assembly 4, generating thrust. During fan component testing, various flow field data are measured through the test interfaces on the measuring casing 11, the first-stage stator casing 31, the second-stage stator casing 35, and the rear load-bearing casing 41, providing data support for fan component performance analysis.

[0036] The dual-stage counter-rotating fan test specimen structure with co-drive in this application can be used for independent fan component testing, enabling rapid and reliable acquisition of component performance, reducing risks, and saving costs. It solves the difficulties in fan test specimen component connection, rotor support, fulcrum design, and test scheme design.

[0037] 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 specimen structure for a two-stage counter-rotating fan driven from the same end, characterized in that, include: The intake casing assembly (1) includes a measuring casing (11), a front load-bearing casing (12), a cap (13), a bearing casing (14), and an inlet guide vane (15). The front load-bearing housing (12) is connected to the measuring housing (11). Multiple first multi-functional support plates are installed on the front load-bearing housing (12). A portion of the first multi-functional support plates are provided with lubricating oil channels, and another portion of the first multi-functional support plates are provided with airflow channels. The first multi-functional support plates are provided with first multi-functional support plate inner rings. The front load-bearing housing (12) is also equipped with a guide vane adjustment mechanism (17). The cap (13) is connected to the inner ring of the first multifunctional support plate; The bearing housing (14) is connected to the inner ring of the first multi-functional support plate and the cap (13) respectively. The bearing housing (14) is provided with a first support bearing mounting part. The bearing housing (14) is provided with an oil passage and an airflow passage. The inlet guide vane (15) is connected to the guide vane adjustment mechanism (17), and the inlet guide vane (15) is provided with a guide vane inner ring (16). The rotor assembly (2) includes a primary rotor and a secondary rotor; The primary rotor is located on the rear side of the intake casing assembly (1), the secondary rotor is located on the rear side of the primary rotor, and both the primary rotor and the secondary rotor are connected to the power unit. The stator assembly (3) includes a primary stator and a secondary stator; The primary stator is located between the primary rotor and the secondary rotor, and is connected to the front load-bearing casing (12); the secondary stator is located on the rear side of the secondary rotor, and is connected to the primary stator; Exhaust casing assembly (4), the exhaust casing assembly (4) is located on the rear side of the secondary stator, and the exhaust casing assembly (4) is connected to the secondary stator.

2. The experimental structure of the two-stage counter-rotating fan driven at the same end according to claim 1, characterized in that, The primary rotor includes a primary integral impeller (21) and a primary fan shaft (25). The radial inner side of the primary integral impeller (21) is provided with a first primary integral impeller connecting part and a second primary integral impeller connecting part. The first primary integral impeller connecting part is provided with a second fulcrum bearing mounting part. The second fulcrum bearing mounting part cooperates with the first fulcrum bearing mounting part to install a fulcrum bearing assembly. One end of the primary fan shaft (25) is connected to the second primary integral impeller connecting part, and the other end is connected to the power device. The primary fan shaft (25) is provided with a first inter-shaft fulcrum bearing mounting part. The secondary rotor includes a secondary integral impeller (211) and a secondary fan shaft (215). A secondary integral impeller connecting part is provided on the radial inner side of the secondary integral impeller (211). One end of the secondary fan shaft (215) is connected to the secondary integral impeller connecting part, and the other end is connected to the power device through a transmission shaft (218). A two-point bearing mounting part, a second inter-shaft bearing mounting part, and a three-point bearing mounting part are provided on the secondary fan shaft (215). The second inter-shaft bearing mounting part cooperates with the first inter-shaft bearing mounting part to install the inter-shaft bearing assembly.

3. The test specimen structure of the two-stage counter-rotating fan driven at the same end according to claim 2, characterized in that, The first-stage stator includes a first-stage stator housing (31) and first-stage stator blades (32). The first-stage stator housing (31) is connected to the front load-bearing housing (12). A first-stage stator blade adjustment mechanism (34) is installed on the first-stage stator housing (31). The first-stage stator blades (32) are connected to the first-stage stator blade adjustment mechanism (34). A first-stage inner ring (33) is provided on the first-stage stator blades (32). The secondary stator includes a secondary stator housing (35) and a secondary stator blade (36). The secondary stator housing (35) is connected to the primary stator housing (31). The secondary stator blade (36) is connected to the secondary stator housing (35). A secondary inner ring (37) is provided on the secondary stator blade (36).

4. The test specimen structure of the two-stage counter-rotating fan driven at the same end according to claim 3, characterized in that, The exhaust casing assembly (4) includes a rear load-bearing casing (41), a two-point bearing housing (43), a bearing casing (45), and a three-point bearing housing (46). The rear load-bearing casing (41) is connected to the secondary stator casing (35). Multiple second multi-functional support plates (42) are installed on the rear load-bearing casing (41), and the second multi-functional support plates (42) are provided with second multi-functional support plate inner rings. The two-point bearing housing (43) is connected to the inner ring of the second multi-functional support plate. The two-point bearing housing (43) is provided with a two-point sealing seat (44). The two-point bearing housing (43), the two-point sealing seat (44) and the two-point bearing mounting part cooperate to install the two-point bearing assembly. The bearing housing (45) is mounted on the second multi-functional support plate (42), and the bearing housing (45) is provided with an oil passage and an airflow passage; The three-point bearing housing (46) is connected to the inner ring of the second multi-functional support plate. A three-point sealing seat (47) is provided on the three-point bearing housing (46). The three-point bearing housing (46), the three-point sealing seat (47) and the three-point bearing mounting part cooperate to install the three-point bearing (217).

5. The experimental structure of the two-stage counter-rotating fan driven at the same end according to claim 4, characterized in that, A support sealing seat is provided on the first support bearing mounting part; The spur bearing assembly includes a spur clamping nut (22), a spur bearing (23), and a spur sealing ring (24). The spur bearing (23) and the spur sealing ring (24) are installed on the second spur bearing mounting part by means of the spur clamping nut (22). The spur sealing ring (24) cooperates with the spur sealing seat to achieve the sealing of the spur bearing (23).

6. The experimental structure of the two-stage counter-rotating fan driven at the same end according to claim 5, characterized in that, An inter-shaft sealing seat is provided on the second inter-shaft support bearing mounting part; The inter-shaft pivot bearing assembly includes an inter-shaft sealing ring (26), an inter-shaft pivot bearing (27), and an inter-shaft pivot clamping nut (28). The inter-shaft pivot bearing (27) and the inter-shaft sealing ring (26) are installed on the first inter-shaft pivot bearing mounting part by means of the inter-shaft pivot clamping nut (28). The inter-shaft sealing ring (26) cooperates with the inter-shaft sealing seat to achieve the sealing of the inter-shaft pivot bearing (27). The secondary fan shaft (215) is also provided with an inter-shaft support oil supply nozzle (216) for supplying oil to the inter-shaft support bearing (27).

7. The experimental structure of the two-stage counter-rotating fan driven at the same end according to claim 6, characterized in that, The two-point bearing assembly includes a two-point sealing ring (212), a two-point bearing (213), and a two-point clamping nut (214). The two-point bearing (213) is installed on the two-point bearing mounting part by means of the two-point clamping nut (214). The two-point sealing ring (212) cooperates with the two-point sealing seat (44) to achieve the sealing of the two-point bearing (213).

8. The test specimen structure of the two-stage counter-rotating fan driven at the same end according to claim 7, characterized in that, The measuring housing (11), the primary stator housing (31), the secondary stator housing (35), and the rear load-bearing housing (41) are all equipped with multiple test interfaces.

9. The experimental structure of the two-stage counter-rotating fan driven at the same end according to claim 8, characterized in that, A first sealing structure is provided between the inner ring (16) of the guide vane and the connection part of the first stage integral bladed disk; A second sealing structure is provided between the primary fan shaft (25) and the primary inner ring (33); A third sealing structure is provided between the secondary integral bladed disk connection part and the primary inner ring (33); A fourth sealing structure is provided between the secondary integral bladed disk connecting part and the secondary inner ring (37); A fifth sealing structure is provided between the secondary integral bladed disk connecting part and the two-point sealing seat (44).

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