A kind of double-stage counter-rotating fan test piece structure driven by same end

Abstract

The application belongs to the field of fan component testing, and particularly relates to a same-end-driven double-stage counter-rotating fan test piece structure. The structure comprises an air inlet casing assembly, a rotor assembly, a stator assembly and an air outlet casing assembly. The same-end-driven double-stage counter-rotating fan test piece structure of the application, on the basis of meeting aerodynamic design, carries out fan test piece structure design, including zero-component connection scheme design, force transmission route scheme design, support scheme design, fulcrum scheme design, test scheme design and the like, and provides a low-risk, quick and convenient test piece for fan component performance analysis.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of fan component testing, and particularly relates to a structure of a double-stage counter-rotating fan test piece driven by the same end. BACKGROUND

[0002] Fan component testing of an aero-engine is a key link to ensure the performance and safety of the engine, and is used to verify the rationality of the design of the fan component, the reliability of the manufacturing process, and the performance in the actual operating environment. Through testing, the key indicators such as the aerodynamic performance, structural strength, vibration characteristics, and material performance of the fan component can be evaluated to ensure that the fan component can meet the design requirements and use requirements of the engine.

[0003] Traditional fan component characteristic testing relies heavily on engine whole-machine test running, and requires manufacturing of a complete engine prototype and building of a whole-machine test bed matched therewith, resulting in high testing cost, long testing period, and being unable to adapt to the rapid iteration of modern aero-engine research and development requirements. In addition, it is extremely difficult to separate the fan component characteristics from the whole-machine test data in the whole-machine environment, and it is difficult to accurately evaluate the design advantages and disadvantages of the fan component itself.

[0004] Therefore, it is desirable to have a technical solution to overcome or alleviate at least one of the above-mentioned deficiencies of the prior art. SUMMARY

[0005] The purpose of the present application is to provide a structure of a double-stage counter-rotating fan test piece driven by the same end to solve at least one problem existing in the prior art.

[0006] The technical solution of the present application is:

[0007] A structure of a double-stage counter-rotating fan test piece driven by the same end, comprising:

[0008] An inlet casing assembly comprising a measuring casing, a front load-bearing casing, a cap, a bearing casing, and inlet guide vanes;

[0009] The front load-bearing casing is connected with the measuring casing, a plurality of first multifunctional support plates are installed on the front load-bearing casing, a portion of the first multifunctional support plates are provided with oil passage openings, and another portion of the first multifunctional support plates are provided with airflow passage openings. First multifunctional support plate inner rings are arranged on the first multifunctional support plates. A guide vane adjusting mechanism is further installed on the front load-bearing casing.

[0010] The cap is connected with the first multifunctional support plate inner rings.

[0011] The bearing casing is connected with the first multifunctional support plate inner rings and the cap, respectively. First fulcrum bearing mounting portions are arranged on the bearing casing. Oil passages and airflow passages are formed in the bearing casing.

[0012] The inlet guide vane is connected with the guide vane adjusting mechanism, and an inner ring of the guide vane is arranged on the inlet guide vane;

[0013] The rotor assembly comprises a primary rotor and a secondary rotor;

[0014] The primary rotor is located at the rear side of the inlet casing assembly, the secondary rotor is located at the rear side of the primary rotor, and the primary rotor and the secondary rotor are connected with the power device;

[0015] The stator assembly comprises a primary stator and a secondary stator;

[0016] The primary stator is located between the primary rotor and the secondary rotor, and the primary stator is connected with the front bearing casing; the secondary stator is located at the rear side of the secondary rotor, and the secondary stator is connected with the primary stator;

[0017] The exhaust casing assembly is located at the rear side of the secondary stator, and the exhaust casing assembly is connected with the secondary stator.

[0018] In at least one embodiment of the present application, the primary rotor comprises a primary blisk and a primary fan shaft, a first primary blisk connecting portion and a second primary blisk connecting portion are arranged at the radially inner side of the primary blisk, a second primary fulcrum bearing mounting portion is arranged on the first primary blisk connecting portion, and a primary fulcrum bearing assembly is mounted on the first primary fulcrum bearing mounting portion and the second primary fulcrum bearing mounting portion in cooperation; one end of the primary fan shaft is connected with the second primary blisk connecting portion, the other end is connected with the power device, and a first inter-shaft fulcrum bearing mounting portion is arranged on the primary fan shaft;

[0019] The secondary rotor comprises a secondary blisk and a secondary fan shaft, a secondary blisk connecting portion is arranged at the radially inner side of the secondary blisk; one end of the secondary fan shaft is connected with the secondary blisk connecting portion, the other end is connected with the power device through a transmission shaft, a second inter-shaft fulcrum bearing mounting portion, a second inter-shaft fulcrum bearing mounting portion and a third inter-shaft fulcrum bearing mounting portion are arranged on the secondary fan shaft, and an inter-shaft fulcrum bearing assembly is mounted on the first inter-shaft fulcrum bearing mounting portion and the second inter-shaft fulcrum bearing mounting portion in cooperation.

[0020] In at least one embodiment of the present application, the primary stator comprises a primary stator casing and a primary stator vane, the primary stator casing is connected with the front bearing casing, and a primary stator vane adjusting mechanism is mounted on the primary stator casing; the primary stator vane is connected with the primary stator vane adjusting mechanism, and a primary inner ring is arranged on the primary stator vane;

[0021] The secondary stator comprises a secondary stator casing and a secondary stator blade, the secondary stator casing is connected with the primary stator casing, and the secondary stator blade is connected with the secondary stator casing, and a secondary inner ring is arranged on the secondary stator blade.

[0022] In at least one embodiment of the present application, the exhaust casing assembly comprises a rear load casing, a two-point bearing seat, a bearing casing barrel and a three-point bearing seat;

[0023] The rear load casing is connected with the secondary stator casing, a plurality of second multifunctional support plates are installed on the rear load casing, and a second multifunctional support plate inner ring is arranged on the second multifunctional support plate;

[0024] The two-point bearing seat is connected with the second multifunctional support plate inner ring, a two-point sealing seat is arranged on the two-point bearing seat, and the two-point bearing seat, the two-point sealing seat and the two-point bearing mounting portion cooperatively mount a two-point bearing assembly;

[0025] The bearing casing barrel is mounted on the second multifunctional support plate, and a lubricating oil passage and an airflow passage are formed in the bearing casing barrel;

[0026] The three-point bearing seat is connected with the second multifunctional support plate inner ring, a three-point sealing seat is arranged on the three-point bearing seat, and the three-point bearing seat, the three-point sealing seat and the three-point bearing mounting portion cooperatively mount a three-point bearing.

[0027] In at least one embodiment of the present application, a one-point sealing seat is arranged on the first one-point bearing mounting portion;

[0028] The one-point bearing assembly comprises a one-point pressing nut, a one-point bearing and a one-point sealing ring, the one-point bearing and the one-point sealing ring are mounted on the second one-point bearing mounting portion through the one-point pressing nut, and the one-point sealing ring cooperates with the one-point sealing seat to realize sealing of the one-point bearing.

[0029] In at least one embodiment of the present application, an inter-shaft sealing seat is arranged on the second inter-shaft bearing mounting portion;

[0030] The inter-shaft bearing assembly comprises an inter-shaft sealing ring, an inter-shaft bearing and an inter-shaft bearing pressing nut, the inter-shaft bearing and the inter-shaft sealing ring are mounted on the first inter-shaft bearing mounting portion through the inter-shaft bearing pressing nut, and the inter-shaft sealing ring cooperates with the inter-shaft sealing seat to realize sealing of the inter-shaft bearing;

[0031] The secondary fan shaft is further provided with an inter-axle fulcrum oil supply nozzle for supplying oil to the inter-axle fulcrum bearing.

[0032] In at least one embodiment of the present application, the two-fulcrum bearing assembly comprises a two-fulcrum sealing ring, a two-fulcrum bearing, and a two-fulcrum compression nut, the two-fulcrum bearing is installed on the two-fulcrum bearing mounting portion through the two-fulcrum compression nut, and the two-fulcrum sealing ring is matched with the two-fulcrum sealing seat to realize the sealing of the two-fulcrum bearing.

[0033] In at least one embodiment of the present application, the measuring casing, the primary stator casing, the secondary stator casing, and the rear load-bearing casing are all provided with a plurality of test interfaces.

[0034] In at least one embodiment of the present application, a first sealing structure is arranged between the guide vane inner ring and the first primary blisk connecting portion;

[0035] A second sealing structure is arranged between the primary fan shaft and the primary inner ring;

[0036] A third sealing structure is arranged between the secondary blisk connecting portion and the primary inner ring;

[0037] A fourth sealing structure is arranged between the secondary blisk connecting portion and the secondary inner ring;

[0038] A fifth sealing structure is arranged between the secondary blisk connecting portion and the two-fulcrum sealing seat.

[0039] The present application has at least the following beneficial technical effects:

[0040] The same-end-driven double-stage counter-rotating fan test piece structure of the present application meets the aerodynamic design and carries out fan test piece structure design, including zero-component connection scheme design, force transmission route scheme design, support scheme design, fulcrum scheme design, test scheme design, etc., to provide low-risk, fast and convenient test pieces for fan component performance analysis. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 is a schematic diagram of the same-end-driven double-stage counter-rotating fan test piece structure of one embodiment of the present application as a whole;

[0042] Figure 2 is a schematic diagram of an inlet casing assembly of one embodiment of the present application;

[0043] Figure 3 is a schematic diagram of a rotor assembly of one embodiment of the present application;

[0044] Figure 4 is a schematic diagram of a stator assembly of one embodiment of the present application;

[0045] Figure 5 is a schematic view of an exhaust casing assembly according to an embodiment of the present application.

[0046] wherein:

[0047] 1 - intake casing assembly; 11 - measuring casing; 12 - front thrust casing; 13 - cap; 14 - bearing casing; 15 - inlet guide vane; 16 - inner ring of guide vane; 17 - guide vane adjusting mechanism;

[0048] 2 - rotor assembly; 21 - first stage blisk; 22 - first stage bearing compression nut; 23 - first stage bearing; 24 - first stage seal ring; 25 - first stage fan shaft; 26 - inter-shaft seal ring; 27 - inter-shaft bearing; 28 - inter-shaft bearing compression nut; 29 - spline; 210 - power plant connection; 211 - second stage blisk; 212 - second stage seal ring; 213 - second stage bearing; 214 - second stage bearing compression nut; 215 - second stage fan shaft; 216 - inter-shaft bearing oil supply nozzle; 217 - third stage bearing; 218 - transmission shaft; 219 - transmission shaft compression nut;

[0049] 3 - stator assembly; 31 - first stage stator casing; 32 - first stage stator vane; 33 - first stage inner ring; 34 - first stage stator vane adjusting mechanism; 35 - second stage stator casing; 36 - second stage stator vane; 37 - second stage inner ring;

[0050] 4 - exhaust casing assembly; 41 - rear thrust casing; 42 - second multi-functional support plate; 43 - second stage bearing seat; 44 - second stage seal seat; 45 - bearing casing cylinder; 46 - third stage bearing seat; 47 - third stage seal seat. DETAILED DESCRIPTION

[0051] In order to make the purpose, 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 drawings. In the drawings, the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are some of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0052] 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.

[0053] The following is in conjunction with the appendix Figures 1 to 5 This application will be described in further detail.

[0054] 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.

[0055] 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.

[0056] The structure of the same end driven double stage counter rotating fan test piece of the application, in the design of the inlet casing assembly 1, by setting various test interfaces on the measuring casing 11, measuring the inlet flow condition, measuring data in the fan component performance test. Through the first multifunctional support plate of a plurality of fixed distribution on the front bearing casing 12, on the one hand, the axial and radial load of the rotor test piece is transmitted, and on the other hand, the oil and sealing gas required for the operation of the test piece are provided. The inner flow path of the airflow is formed among the inner ring of the first multifunctional support plate, the cap 13 and the inner ring of the guide vane 16. The bearing casing 14 integrates the oil and gas channels for bearing lubrication and sealing, while providing the bearing mounting position. A plurality of adjustable inlet guide vanes 15 are driven by the guide vane adjusting mechanism 17, and are adjusted in real time during the operation of the test piece according to the needs, to meet the performance requirements in different states.

[0057] As shown in Figure 3 The rotor assembly 2 includes a primary rotor and a secondary rotor, the primary rotor is located at the rear side of the inlet casing assembly 1, and the secondary rotor is located at the rear side of the primary rotor, both of which are connected with the power device. The primary rotor includes a primary blisk 21 and a primary fan shaft 25, the radial inner side of the primary blisk 21 is provided with a first primary blisk connecting part and a second primary blisk connecting part, the first primary blisk connecting part is provided with a second primary bearing mounting part, and the second primary bearing mounting part is installed with a primary bearing assembly in cooperation with the first primary bearing mounting part. One end of the primary fan shaft 25 is connected with the second primary blisk connecting part, the other end is connected with the power device, and the primary fan shaft 25 is provided with a first inter-shaft bearing mounting part.

[0058] In the embodiment, the first primary bearing mounting part is provided with a primary sealing seat; the primary bearing assembly includes a primary pressing nut 22, a primary bearing 23 and a primary sealing ring 24, the primary bearing 23 and the primary sealing ring 24 are installed on the second primary bearing mounting part through the primary pressing nut 22, and the primary sealing ring 24 cooperates with the primary sealing seat to realize the sealing of the primary bearing 23.

[0059] The secondary rotor includes a secondary blisk 211 and a secondary fan shaft 215, the radial inner side of the secondary blisk 211 is provided with a secondary blisk connecting part; one end of the secondary fan shaft 215 is connected with the secondary blisk connecting part, the other end is connected with the power device through a transmission shaft 218, the secondary fan shaft 215 is provided with a second primary bearing mounting part, a second inter-shaft bearing mounting part and a third primary bearing mounting part, the second inter-shaft bearing mounting part is installed with an inter-shaft bearing assembly in cooperation with the first inter-shaft bearing mounting part.

[0060] In the embodiment, the second inter-shaft fulcrum bearing mounting portion is provided with an inter-shaft sealing seat; the inter-shaft fulcrum bearing assembly comprises an inter-shaft sealing ring 26, an inter-shaft fulcrum bearing 27 and an inter-shaft fulcrum pressing nut 28, the inter-shaft fulcrum bearing 27 and the inter-shaft sealing ring 26 are mounted on the first inter-shaft fulcrum bearing mounting portion through the inter-shaft fulcrum pressing nut 28, the inter-shaft sealing ring 26 cooperates with the inter-shaft sealing seat to realize the sealing of the inter-shaft fulcrum bearing 27; the second-stage fan shaft 215 is further provided with an inter-shaft fulcrum oil supply nozzle 216 for supplying oil to the inter-shaft fulcrum bearing 27.

[0061] The structure of the same-end driven two-stage counter-rotating fan test piece of the application, the first-stage blisk 21 and the first-stage fan shaft 25 are connected as a whole through bolts and nuts, the power device transmits power to the first-stage rotor through the spline 29 on the power device connecting portion 210 of the end portion of the first-stage fan shaft 25, under the support of the one fulcrum bearing 23 and the inter-shaft fulcrum bearing 27, the first-stage rotor rotates to do work on the airflow, and the one fulcrum sealing ring 24 plays a sealing role in the cavity of the one fulcrum bearing 23. The second-stage blisk connecting portion of the second-stage blisk 211 and the second-stage fan shaft 215 are connected as a whole through bolts and nuts, the transmission shaft 218 is connected with the second-stage fan shaft 215 through the transmission shaft pressing nut 219, the power device transmits power to the second-stage rotor through the transmission shaft 218, under the support of the two fulcrum bearing 213 and the three fulcrum bearing 217, the second-stage rotor rotates to do work on the airflow, at the same time, the inter-shaft fulcrum oil supply nozzle 216 lubricates the inter-shaft fulcrum bearing 27, and the inter-shaft sealing ring 26 plays a sealing role in the bearing cavity. Each pressing nut plays a role in stabilizing each fulcrum. The power input of the first-stage rotor and the second-stage rotor is arranged at the same end, which provides a convenient interface for the power device.

[0062] As shown in Figure 4 The stator assembly 3 comprises a first-stage stator and a second-stage stator, the first-stage stator is located between the first-stage rotor and the second-stage rotor and is connected with the front load-bearing casing 12, and the second-stage stator is located at the rear side of the second-stage rotor and is connected with the first-stage stator. The first-stage stator comprises a first-stage stator casing 31 and first-stage stator blades 32, the first-stage stator casing 31 is connected with the front load-bearing casing 12, and the first-stage stator casing 31 is provided with a first-stage stator blade adjusting mechanism 34; the first-stage stator blades 32 are connected with the first-stage stator blade adjusting mechanism 34, and the first-stage stator blades 32 are provided with a first-stage inner ring 33; the second-stage stator comprises a second-stage stator casing 35 and second-stage stator blades 36, and the second-stage stator casing 35 is connected with the first-stage stator casing 31; the second-stage stator blades 36 are connected with the second-stage stator casing 35, and the second-stage stator blades 36 are provided with a second-stage inner ring 37. The first-stage stator casing 31 and the second-stage stator casing 35 are both provided with a plurality of test interfaces.

[0063] The same end driven double-stage counter-rotating fan test piece structure of the application, a plurality of rotatable adjustable first stator blades 32 are installed on the first stator casing 31, under the driving of the first stator blade adjusting mechanism 34, the test piece is adjusted in real time during operation according to needs to meet different state performance requirements. A plurality of fixedly distributed second stator blades 36 are installed on the second stator casing 35. The first inner ring 33 and the second inner ring 37 constitute an airflow inner flow path. The first stator casing 31 and the second stator casing 35 provide force transmission support for the test piece, and various test interfaces are integrated on the first stator casing 31 and the second stator casing 35 for measuring data during fan component performance testing.

[0064] As shown in Figure 5 The exhaust casing assembly 4 is located at the rear side of the second stator, and the exhaust casing assembly 4 is connected with the second stator. The exhaust casing assembly 4 includes a rear force bearing casing 41, a two-joint bearing seat 43, a bearing casing barrel 45, and a three-joint bearing seat 46. The rear force bearing casing 41 is connected with the second stator casing 35, and a plurality of second multifunctional support plates 42 are installed on the rear force bearing casing 41, and a second multifunctional support plate inner ring is arranged on the second multifunctional support plate 42; the two-joint bearing seat 43 is connected with the second multifunctional support plate inner ring, and a two-joint sealing seat 44 is arranged on the two-joint bearing seat 43, and the two-joint bearing seat 43, the two-joint sealing seat 44, and a two-joint bearing mounting portion cooperate to mount a two-joint bearing assembly; the bearing casing barrel 45 is installed on the second multifunctional support plate 42, and a sliding oil passage and an airflow passage are formed in the bearing casing barrel 45; the three-joint bearing seat 46 is connected with the second multifunctional support plate inner ring, and a three-joint sealing seat 47 is arranged on the three-joint bearing seat 46, and the three-joint bearing seat 46, the three-joint sealing seat 47, and a three-joint bearing mounting portion cooperate to mount a three-joint bearing 217.

[0065] In this embodiment, the two-joint bearing assembly includes a two-joint sealing ring 212, a two-joint bearing 213, and a two-joint pressing nut 214. The two-joint bearing 213 is installed on the two-joint bearing mounting portion through the two-joint pressing nut 214, and the two-joint sealing ring 212 cooperates with the two-joint sealing seat 44 to realize the sealing of the two-joint bearing 213.

[0066] The same end driven double-stage counter-rotating fan test piece structure of the application, the rear force bearing casing 41 is the main force bearing structure of the test piece, a plurality of fixedly distributed second multifunctional support plates 42 are arranged, and various direction loads generated by the rotation of the rotor are transmitted to the rear force bearing casing 41 through the joint bearing mounting seats, and then transmitted to the base through the mounting joints. The bearing casing barrel 45 integrates oil and gas passages for bearing lubrication and sealing. The two-joint sealing seat 44 and the three-joint bearing seat 46 cooperate with the corresponding sealing rings to seal the joint bearing cavities. The rear force bearing casing 41 integrates various test interfaces for measuring data during fan component performance testing.

[0067] The same end driven double-stage counter-rotating fan test piece structure of the application is further provided with a plurality of sealing structures between the inlet casing assembly 1, the rotor assembly 2, the stator assembly 3 and the exhaust casing assembly 4. Among them, the first sealing structure is arranged between the guide vane inner ring 16 and the first primary integrated blade disc connecting part; the second sealing structure is arranged between the primary fan shaft 25 and the primary inner ring 33; the third sealing structure is arranged between the secondary integrated blade disc connecting part and the primary inner ring 33; the fourth sealing structure is arranged between the secondary integrated blade disc connecting part and the secondary inner ring 37; and the fifth sealing structure is arranged between the secondary integrated blade disc connecting part and the two fulcrum sealing seats 44.

[0068] The same end driven double-stage counter-rotating fan test piece structure of the application is further provided with a plurality of sealing structures between the inlet casing assembly 1, the rotor assembly 2, the stator assembly 3 and the exhaust casing assembly 4. Among them, the first sealing structure is arranged between the guide vane inner ring 16 and the first primary integrated blade disc connecting part; the second sealing structure is arranged between the primary fan shaft 25 and the primary inner ring 33; the third sealing structure is arranged between the secondary integrated blade disc connecting part and the primary inner ring 33; the fourth sealing structure is arranged between the secondary integrated blade disc connecting part and the secondary inner ring 37; and the fifth sealing structure is arranged between the secondary integrated blade disc connecting part and the two fulcrum sealing seats 44.

[0069] The same end driven double-stage counter-rotating fan test piece structure of the application is further provided with a plurality of sealing structures between the inlet casing assembly 1, the rotor assembly 2, the stator assembly 3 and the exhaust casing assembly 4. Among them, the first sealing structure is arranged between the guide vane inner ring 16 and the first primary integrated blade disc connecting part; the second sealing structure is arranged between the primary fan shaft 25 and the primary inner ring 33; the third sealing structure is arranged between the secondary integrated blade disc connecting part and the primary inner ring 33; the fourth sealing structure is arranged between the secondary integrated blade disc connecting part and the secondary inner ring 37; and the fifth sealing structure is arranged between the secondary integrated blade disc connecting part and the two fulcrum sealing seats 44.

[0070] The above is merely a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the application, which shall be covered in the protection scope of the application. Therefore, the protection scope of the application shall be subject to the protection scope of the claims.

Claims

1. A structure of a double-stage counter-rotating fan test piece driven by the same end, characterized by, The utility model relates to an inlet casing assembly (1) comprising a measuring casing (11), a front bearing casing (12), a cap (13), a bearing casing (14) and an inlet guide vane (15), wherein the front bearing casing (12) is connected with the measuring casing (11), a plurality of first multifunctional support plates are installed on the front bearing casing (12), a part of the first multifunctional support plates are provided with oil passage, another part of the first multifunctional support plates are provided with airflow passage, a first multifunctional support plate inner ring is arranged on the first multifunctional support plate, and a guide vane adjusting mechanism (17) is also installed on the front bearing casing (12); the cap (13) is connected with the first multifunctional support plate inner ring; the bearing casing (14) is connected with the first multifunctional support plate inner ring and the cap (13) respectively, a first fulcrum bearing mounting portion is arranged on the bearing casing (14), and oil passage and airflow passage are formed in the bearing casing (14); the inlet guide vane (15) is connected with the guide vane adjusting mechanism (17), and a guide vane inner ring (16) is arranged on the inlet guide vane (15); a rotor assembly (2) comprising a primary rotor and a secondary rotor; the primary rotor is located at the rear side of the inlet casing assembly (1), the secondary rotor is located at the rear side of the primary rotor, and the primary rotor and the secondary rotor are connected with a power device; a stator assembly (3) comprising a primary stator and a secondary stator; the primary stator is located between the primary rotor and the secondary rotor, and the primary stator is connected with the front bearing casing (12); the secondary stator is located at the rear side of the secondary rotor, and the secondary stator is connected with the primary stator; an exhaust casing assembly (4) located at the rear side of the secondary stator, and connected with the secondary stator. The primary rotor comprises a primary blisk (21) and a primary fan shaft (25), the radial inner side of the primary blisk (21) is provided with a first primary blisk connecting portion and a second primary blisk connecting portion, a second fulcrum bearing mounting portion is arranged on the first primary blisk connecting portion, and a fulcrum bearing assembly is mounted on the first fulcrum bearing mounting portion and the second fulcrum bearing mounting portion in cooperation; one end of the primary fan shaft (25) is connected with the second primary blisk connecting portion, the other end is connected with the power device, and a first inter-shaft fulcrum bearing mounting portion is arranged on the primary fan shaft (25). ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The homodromously driven two-stage counter-rotating fan test piece structure according to claim 1, characterized in that ​ The secondary rotor comprises a secondary blisk (211) and a secondary fan shaft (215), the secondary blisk (211) is provided with a secondary blisk connecting part at the radially inner side, one end of the secondary fan shaft (215) is connected with the secondary blisk connecting part, the other end is connected with the power device through a transmission shaft (218), the secondary fan shaft (215) is provided with a two-pivot bearing mounting part, a second inter-shaft pivot bearing mounting part and a three-pivot bearing mounting part, the second inter-shaft pivot bearing mounting part is matched with the first inter-shaft pivot bearing mounting part to install an inter-shaft pivot bearing assembly.

3. The homodromously driven two-stage counter-rotating fan test piece structure according to claim 2, characterized in that The primary stator comprises a primary stator casing (31) and a primary stator blade (32), the primary stator casing (31) is connected with the front load-bearing casing (12), and a primary stator blade adjusting mechanism (34) is installed on the primary stator casing (31); the primary stator blade (32) is connected with the primary stator blade adjusting mechanism (34), and a primary inner ring (33) is arranged on the primary stator blade (32); The secondary stator comprises a secondary stator casing (35) and a secondary stator blade (36), the secondary stator casing (35) is connected with the primary stator casing (31); the secondary stator blade (36) is connected with the secondary stator casing (35), and a secondary inner ring (37) is arranged on the secondary stator blade (36).

4. The homodromous driven two-stage contra-rotating fan test piece structure according to claim 3, characterized in that, The exhaust casing assembly (4) comprises a rear load-bearing casing (41), a two-pivot bearing seat (43), a bearing casing barrel (45) and a three-pivot bearing seat (46); The rear load-bearing casing (41) is connected with the secondary stator casing (35), a plurality of second multifunctional support plates (42) are installed on the rear load-bearing casing (41), and a second multifunctional support plate inner ring is arranged on the second multifunctional support plate (42); The two-pivot bearing seat (43) is connected with the second multifunctional support plate inner ring, a two-pivot sealing seat (44) is arranged on the two-pivot bearing seat (43), and the two-pivot bearing seat (43), the two-pivot sealing seat (44) and the two-pivot bearing mounting part are matched to install a two-pivot bearing assembly; The bearing casing barrel (45) is installed on the second multifunctional support plate (42), and a lubricating oil channel and an airflow channel are formed in the bearing casing barrel (45); The three-pivot bearing seat (46) is connected with the second multifunctional support plate inner ring, a three-pivot sealing seat (47) is arranged on the three-pivot bearing seat (46), and the three-pivot bearing seat (46), the three-pivot sealing seat (47) and the three-pivot bearing mounting part are matched to install a three-pivot bearing (217).

5. The homodromously driven two-stage counter-rotating fan test piece structure according to claim 4, characterized in that A one-pivot sealing seat is arranged on the first one-pivot bearing mounting part; The one fulcrum bearing assembly comprises a fulcrum pressing nut (22), a fulcrum bearing (23) and a fulcrum sealing ring (24), the fulcrum bearing (23) and the fulcrum sealing ring (24) are installed on the second fulcrum bearing mounting portion through the fulcrum pressing nut (22), and the fulcrum sealing ring (24) is matched with the fulcrum sealing seat to realize the sealing of the fulcrum bearing (23).

6. The homodromously driven two-stage counter-rotating fan test piece structure according to claim 5, characterized in that The second inter-shaft fulcrum bearing mounting portion is provided with an inter-shaft sealing seat; The inter-shaft fulcrum bearing assembly comprises an inter-shaft sealing ring (26), an inter-shaft fulcrum bearing (27) and an inter-shaft fulcrum pressing nut (28), the inter-shaft fulcrum bearing (27) and the inter-shaft sealing ring (26) are installed on the first inter-shaft fulcrum bearing mounting portion through the inter-shaft fulcrum pressing nut (28), and the inter-shaft sealing ring (26) is matched with the inter-shaft sealing seat to realize the sealing of the inter-shaft fulcrum bearing (27); The two fulcrum bearing assemblies comprise a two fulcrum sealing ring (212), a two fulcrum bearing (213) and a two fulcrum pressing nut (214), the two fulcrum bearing (213) is installed on the two fulcrum bearing mounting portion through the two fulcrum pressing nut (214), and the two fulcrum sealing ring (212) is matched with the two fulcrum sealing seat (44) to realize the sealing of the two fulcrum bearing (213).

7. The homodromously driven two-stage counter-rotating fan test piece structure according to claim 6, characterized in that The measuring casing (11), the primary stator casing (31), the secondary stator casing (35) and the rear load-bearing casing (41) are all provided with a plurality of test interfaces.

8. The homodromously driven two-stage counter-rotating fan test piece structure according to claim 7, characterized in that A first sealing structure is arranged between the guide vane inner ring (16) and the first primary integral blade disc connecting portion; 9. The homodromously driven two-stage counter-rotating fan test piece structure according to claim 8, characterized in that A second sealing structure is arranged between the primary fan shaft (25) and the primary inner ring (33); A third sealing structure is arranged between the secondary integral blade disc connecting portion and the primary inner ring (33); A fourth sealing structure is arranged between the secondary integral blade disc connecting portion and the secondary inner ring (37); A fifth sealing structure is arranged between the secondary integral blade disc connecting portion and the two fulcrum sealing seat (44). ​

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