A ram air turbine assembly that can reduce axial loads

Abstract

The utility model provides a kind of ram air turbine assembly capable of reducing axial load, it is related to the field of aviation emergency power.The ram air turbine assembly includes: shell;Rotor shaft, one end of which extends into shell and is rotatably connected with shell by bearing, the other end extends to outside shell;And wind wheel, which is fixedly sleeved on the rotor shaft outside shell;Wherein, at least one of the web of wind wheel and rotor shaft is provided with air hole;When air hole is arranged in web, air hole penetrates web along axial direction;When air hole is arranged in rotor shaft, one end of the air hole is opened in the end face of the end of rotor shaft away from shell, and the other end is opened in the outer peripheral surface of rotor shaft between shell and wind wheel;The outer edge of wind wheel is gap fitted with shell, and sealing structure is arranged at the gap fitting place of the two. The present application can effectively alleviate the problem of shortened service life of bearing caused by overload, and ultimately significantly improve the overall working life and operation reliability of ram air turbine assembly.

Description

Technical Field

[0001] This utility model relates to the field of aviation emergency power technology, and more specifically, to a ram air turbine assembly that can reduce axial load. Background Technology

[0002] A ramjet air turbine is an emergency turbine generator unit activated when the main engine or auxiliary power system of an aircraft completely fails. It is specifically designed for emergency landings to improve survivability. It works by utilizing the kinetic energy of the aircraft during flight. By deploying the impeller in an emergency, the high-speed oncoming airflow forces the impeller to rotate at high speed, which in turn drives a connected electric motor and hydraulic pump to generate emergency energy. This provides the necessary power to the cockpit, flight control system, hydraulic system, and electronic equipment, enabling the pilot to perform emergency operations.

[0003] When a ram air turbine is operating, especially at low altitudes and high speeds, the impeller generates significant axial force due to its high rotational speed. This axial force needs to be transmitted to the casing through the shaft and bearings. Bearings themselves have inherent lifespan limitations, and large axial forces can significantly shorten their lifespan. This issue directly affects the overall service life of the ram air turbine and reduces its reliability during operation. Utility Model Content

[0004] The purpose of this invention is to provide a ram air turbine assembly that can reduce axial load, thereby solving the technical problems mentioned in the background art.

[0005] The embodiments of this utility model are implemented as follows: This application provides a ram air turbine assembly that can reduce axial load, comprising: a housing; a rotor shaft, one end of which extends into the housing and is rotatably connected to the housing via a bearing, and the other end of which extends outside the housing; and a fan wheel, which is fixedly sleeved on the rotor shaft located outside the housing; wherein, at least one of the web of the fan wheel and the rotor shaft is provided with a vent hole; when the vent hole is provided on the web, the vent hole penetrates the web axially; when the vent hole is provided on the rotor shaft, one end of the vent hole opens at the end face of the rotor shaft away from the housing, and the other end opens at the outer circumferential surface of the rotor shaft between the housing and the fan wheel; the outer edge of the fan wheel is clearance-fitted with the housing, and a sealing structure is provided at the clearance fit between the two.

[0006] Furthermore, based on the aforementioned scheme, the vent hole on the rotor shaft is located at the shaft center.

[0007] Furthermore, based on the aforementioned scheme, the housing includes an annular shell and a front end cover and a rear end cover respectively disposed at both ends of the annular shell. The front end cover is detachably connected to the annular shell, and the rear end cover is integrally formed with the annular shell. One end of the rotor shaft passes through the front end cover and extends into the annular shell, and is rotatably connected to the rear end cover.

[0008] Furthermore, based on the aforementioned scheme, the aforementioned bearings are provided between the rotor shaft and the front end cover, and between the rotor shaft and the rear end cover.

[0009] Furthermore, based on the aforementioned scheme, the bearing is a deep groove ball bearing.

[0010] Furthermore, based on the aforementioned scheme, the bearing is an angular contact bearing.

[0011] Furthermore, based on the aforementioned scheme, the sealing structure is a non-contact sealing structure.

[0012] Furthermore, based on the aforementioned scheme, the non-contact sealing structure is a comb seal, a labyrinth seal, or a spiral seal.

[0013] Furthermore, based on the aforementioned scheme, the annular shell and the front end cover are detachably connected by bolts.

[0014] Furthermore, based on the aforementioned scheme, there are multiple ventilation holes on the aforementioned web plate, which are arranged sequentially at intervals around the circumference of the aforementioned wind turbine.

[0015] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects: The ram air turbine assembly of this application constructs airflow channels on both sides of the wind turbine axially by setting vent holes on one or both of the web plate and the rotor shaft. Its core principle is to use the vent holes to guide the high-pressure gas in front of the wind turbine. When the ram air turbine is working, the high-pressure gas in front of the wind turbine web plate can flow directly to the rear side of the web plate through the axial through hole on the web plate, or enter the rear side of the wind turbine through the vent holes on the rotor shaft, thereby generating forward thrust on the wind turbine. This thrust can directly offset part of the axial force generated by the wind turbine at high speed. At the same time, the sealing structure at the clearance mating surface between the outer edge of the wind turbine and the housing can effectively block external airflow interference and internal airflow leakage, ensuring the air pressure balance on both sides of the wind turbine axially and avoiding insufficient thrust due to airflow loss. The advantages of this design are that it can remove part of the axial force from the source without the need for complex additional parts, significantly reducing the total load transmitted to the bearing and effectively alleviating the problem of shortened bearing life caused by overload; the synergistic effect of the sealing structure and the vent ensures the stability of the load reduction effect, and the overall structural design is simple and highly adaptable. It does not affect the normal operation of the impeller and rotor shaft, and can significantly improve the overall working life and operational reliability of the ram air turbine assembly, taking into account both practicality and economy. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an isometric view of a ram air turbine assembly that can reduce axial load according to an embodiment of the present invention; Figure 2 This is a side view of a ram air turbine assembly that can reduce axial load according to an embodiment of the present invention; Figure 3 for Figure 2 A cross-sectional view along the AA direction; Figure 4 This is an isometric view of the wind turbine according to an embodiment of the present invention; Figure 5 This is an isometric view of the rotor shaft in an embodiment of the present invention. Figure 6 This is a schematic diagram of the structure of the comb seal according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the spiral seal structure according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the labyrinth seal structure according to an embodiment of the present invention.

[0018] Icons: 1-Shell, 101-Front end cover, 102-Annular shell, 103-Rear end cover, 2-Iron wheel, 3-Rotor shaft, 4-Ventilation hole, 5-Body plate, 6-Mounting base, 7-Bearing. Detailed Implementation

[0019] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Example

[0020] Please refer to Figures 1-8A ram air turbine assembly capable of reducing axial load includes: a housing 1; a rotor shaft 3, one end of which extends into the housing 1 and is rotatably connected to the housing 1 via a bearing 7, and the other end of which extends outside the housing 1; and a fan 2, which is fixedly sleeved on the rotor shaft 3 located outside the housing 1; wherein, at least one of the web plate 5 of the fan 2 and the rotor shaft 3 is provided with a vent hole 4; when the vent hole 4 is provided on the web plate 5, the vent hole 4 penetrates the web plate 5 axially; when the vent hole 4 is provided on the rotor shaft 3, one end of the vent hole 4 opens at the end face of the rotor shaft 3 away from the housing 1, and the other end opens at the outer circumferential surface of the rotor shaft 3 between the housing 1 and the fan 2; the outer edge of the fan 2 is clearance-fitted with the housing 1, and a sealing structure is provided at the clearance fit between the two.

[0021] The ram air turbine assembly of this application constructs airflow channels on both sides of the impeller 2 by setting vent holes 4 on one or both of the web plate 5 and the rotor shaft 3. Its core principle is to use the vent holes 4 to guide the high-pressure gas in front of the impeller 2. When the ram air turbine is working, the high-pressure gas in front of the web plate 5 of the impeller 2 can flow directly to the rear side of the web plate 5 through the axial through hole on the web plate 5, or enter the rear side of the impeller 2 through the vent holes 4 on the rotor shaft 3, thereby generating a forward thrust on the impeller 2. This thrust can directly offset part of the axial force generated by the impeller 2 at high speed. At the same time, the sealing structure at the clearance mating surface between the outer edge of the impeller 2 and the housing 1 can effectively block external airflow interference and internal airflow leakage, ensuring the air pressure balance on both sides of the impeller 2 and avoiding insufficient thrust due to airflow loss. The advantage of this design is that it can remove part of the axial force from the source without the need for complex additional parts, significantly reducing the total load transmitted to bearing 7 and effectively alleviating the problem of shortened life of bearing 7 due to overload. The synergistic effect of the sealing structure and the vent 4 ensures the stability of the load reduction effect. Moreover, the overall structural design is simple and highly adaptable. It does not affect the normal operation of impeller 2 and rotor shaft 3, and can significantly improve the overall working life and operational reliability of the ram air turbine assembly, taking into account both practicality and economy.

[0022] Specifically, the outer side of the housing 1 is provided with a mounting base 6, and the mounting base 6 is provided with mounting holes to facilitate the installation of the ram air turbine assembly.

[0023] In a preferred embodiment, the vent 4 on the rotor shaft 3 is located at the shaft center.

[0024] In the above embodiment, the vent hole 4 at the center of the rotor shaft 3 can accurately guide the high-pressure gas at the front of the impeller 2 to the rear to generate forward thrust. While ensuring the structural strength of the rotor shaft 3, it can efficiently remove part of the axial force, stabilize the air pressure balance effect, and reduce the load on the bearing 7.

[0025] In a preferred embodiment, the housing 1 includes an annular shell 102 and a front cover 101 and a rear cover 103 respectively disposed at both ends of the annular shell 102. The front cover 101 is detachably connected to the annular shell 102, and the rear cover 103 is integrally formed with the annular shell 102. One end of the rotor shaft 3 passes through the front end cover 101 and extends into the annular shell 102, and is rotatably connected to the rear end cover 103.

[0026] In the above embodiments, the detachable connection method greatly simplifies the assembly process of core components such as rotor shaft 3 and bearing 7. In addition, during subsequent maintenance or repair, the front cover 101 can be removed separately to quickly access easily worn components such as bearing 7 and rotor shaft 3, reducing maintenance difficulty and cost, while facilitating component replacement or upgrades.

[0027] In a preferred embodiment, the bearing 7 is provided between the rotor shaft 3 and the front end cover 101, and between the rotor shaft 3 and the rear end cover 103.

[0028] In the above embodiment, the rotor shaft 3 is provided with a double bearing 7 arrangement between the front cover 101 and the rear cover 103. This arrangement can accurately support the rotor shaft 3 and evenly distribute the axial force and radial force, further reducing the load on a single bearing 7, improving the smoothness of operation, extending the life of the bearing 7 and enhancing the reliability of the assembly.

[0029] As a preferred embodiment, the bearing 7 described above is a deep groove ball bearing.

[0030] In the above embodiments, the deep groove ball bearing is adapted to the arrangement of the two bearings 7, which can simultaneously withstand radial and axial forces, operate smoothly, and has the advantages of reliable structure and strong adaptability, further ensuring the load reduction effect of the bearings 7 and the long-term stable operation of the ram air turbine assembly.

[0031] As a preferred embodiment, the bearing 7 described above is an angular contact bearing.

[0032] In the above embodiment, an angular contact bearing is used to adapt to the arrangement of dual bearings 7. It has strong axial load capacity and can also take into account radial force. It can accurately match the force requirements of the ram air turbine, improve the operating accuracy and structural rigidity of the rotor shaft 3, and further ensure the load reduction effect of bearing 7 and the long-term stable operation of the assembly.

[0033] As a preferred embodiment, the above-mentioned sealing structure is a non-contact sealing structure.

[0034] In the above embodiments, a non-contact sealing structure is used as the sealing structure, which avoids wear and operating resistance caused by contact friction, effectively blocks the intrusion of external impurities, prevents internal airflow leakage, stabilizes the air pressure balance on both sides of the impeller 2 axis to ensure the thrust unloading effect, and protects the bearing 7, further improving the operating stability and service life of the ram air turbine assembly.

[0035] As a preferred embodiment, the above-mentioned non-contact sealing structure is a toothed seal, a labyrinth seal, or a spiral seal.

[0036] In the above embodiments, a comb seal, labyrinth seal, or spiral seal is used as a non-contact sealing structure. The sealing performance is reliable and there is no contact wear. It can effectively block the intrusion of external impurities, prevent internal airflow leakage, stabilize the air pressure balance on both sides of the impeller 2 axis to ensure the thrust unloading effect, help reduce the load on the bearing 7, and further improve the operational stability and durability of the ram air turbine assembly.

[0037] In a preferred embodiment, the annular shell 102 and the front end cover 101 are detachably connected by bolts.

[0038] In the above embodiments, the annular shell 102 and the front cover 101 are connected by bolts for detachability, which not only ensures the connection is firm and the sealing effect, but also simplifies the assembly process and facilitates the subsequent inspection and replacement of core components such as the internal bearing 7 and rotor shaft 3, further improving the practicality and maintenance convenience of the ram air turbine assembly.

[0039] In a preferred embodiment, the number of ventilation holes 4 on the web plate 5 is multiple, and they are arranged sequentially at intervals around the circumference of the impeller 2.

[0040] In the above embodiment, multiple ventilation holes 4 on the web plate 5 are arranged sequentially and at intervals around the impeller 2, which enables the high-pressure gas on the front side of the impeller 2 to flow evenly to the rear side to generate a balanced forward thrust, effectively relieve some of the axial force to reduce the load on the bearing 7, and at the same time ensure the smooth operation of the impeller 2, further improving the load reduction stability and operational reliability of the ram air turbine assembly.

[0041] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0042] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

Claims

1. A ram air turbine assembly capable of reducing axial load, characterized in that, include: Shell (1); A rotor shaft (3), one end of which extends into the housing (1) and is rotatably connected to the housing (1) via a bearing (7), and the other end extends out of the housing (1); and The wind turbine (2) is fixedly mounted on the rotor shaft (3) located outside the housing (1); Ventilation holes (4) are provided on at least one of the web plate (5) of the wind turbine (2) and the rotor shaft (3); When the vent (4) is provided on the web (5), the vent (4) penetrates the web (5) axially; When the vent (4) is provided on the rotor shaft (3), one end of the vent (4) is located on the end face of the rotor shaft (3) away from the housing (1), and the other end is located on the outer circumferential surface of the rotor shaft (3) between the housing (1) and the impeller (2); The outer edge of the wind turbine (2) is fitted with the housing (1) with a clearance, and a sealing structure is provided at the clearance between the two.

2. The ram air turbine assembly with reduced axial load according to claim 1, characterized in that, The vent (4) on the rotor shaft (3) is located at the center of the shaft.

3. A ram air turbine assembly capable of reducing axial load according to claim 1, characterized in that, The housing (1) includes an annular shell (102) and a front cover (101) and a rear cover (103) respectively disposed at both ends of the annular shell (102). The front cover (101) is detachably connected to the annular shell (102), and the rear cover (103) is integrally formed with the annular shell (102). One end of the rotor shaft (3) passes through the front end cover (101) and extends into the annular shell (102), and is rotatably connected to the rear end cover (103).

4. A ram air turbine assembly capable of reducing axial load according to claim 3, characterized in that, The bearing (7) is provided between the rotor shaft (3) and the front end cover (101), and between the rotor shaft (3) and the rear end cover (103).

5. A ram air turbine assembly capable of reducing axial load according to claim 4, characterized in that, The bearing (7) is a deep groove ball bearing.

6. A ram air turbine assembly capable of reducing axial load according to claim 4, characterized in that, The bearing (7) is an angular contact bearing.

7. A ram air turbine assembly capable of reducing axial load according to claim 1, characterized in that, The sealing structure is a non-contact sealing structure.

8. A ram air turbine assembly capable of reducing axial load according to claim 7, characterized in that, The non-contact sealing structure is a comb seal, labyrinth seal, or spiral seal.

9. A ram air turbine assembly capable of reducing axial load according to claim 3, characterized in that, The annular shell (102) and the front end cover (101) are detachably connected by bolts.

10. A ram air turbine assembly capable of reducing axial load according to claim 1, characterized in that, The number of ventilation holes (4) on the web plate (5) is multiple, and they are arranged at intervals around the circumference of the wind turbine (2).

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