Radial bearing and aero-engine provided with same

Abstract

The invention belongs to the technical field of aviation equipment, and particularly relates to a radial bearing and an aero-engine provided with the radial bearing. The radial bearing comprises a bearing seat, an electromagnetic bearing part and a sliding bearing part, one end of the electromagnetic bearing part is installed on the bearing seat, and the sliding bearing part is connected with the other end of the electromagnetic bearing part; after the electromagnetic bearing part is started, the sliding bearing part is supported. The invention further provides an aero-engine, the aero-engine comprises the radial bearing, and the radial bearing is installed on a casing and / or a support of the aero-engine. According to the technical scheme, the electromagnetic supporting part provides auxiliary supporting for the sliding bearing part, the abrasion loss of the sliding bearing part is effectively reduced, and the service life is effectively prolonged. According to the radial bearing and the aero-engine provided with the radial bearing, the technical defects that in the prior art, the stability, the small size and the long service life of the bearing cannot be considered at the same time are overcome.

Description

Technical Field

[0001] The present application belongs to the technical field of aviation equipment, and in particular, is concerned with designing a radial bearing and an aviation engine equipped with the radial bearing. Background Art

[0002] With the upgrading of aircraft, the requirements for engine thrust-to-weight ratio, service life, reliability, etc. are getting higher and higher. The increase in engine thrust leads to a corresponding increase in speed and temperature before the turbine, making the working environment of aircraft engine bearings more severe. The service life of traditional rolling bearings cannot meet the requirements.

[0003] Electromagnetic bearings are a new type of bearing that uses electromagnetic force to stably suspend the rotor and whose axis position can be controlled by a control system. They are mostly used in ground environments such as flywheel energy storage and high-speed motors. The biggest problems they face are that they occupy a large space and are difficult to control in terms of stability. As the weight of the rotor increases, the radial dimensions of the electromagnetic bearings will increase exponentially compared to ball and roller bearings, making the overall layout of the engine difficult. In addition, due to the existence of a gap between the electromagnetic bearing and the shaft, the stability of the rotor system in a suspended state becomes a prominent issue.

[0004] Therefore, developing a radial bearing and an aircraft engine equipped with a radial bearing to solve the technical defects in the prior art that cannot simultaneously take into account the stability, small size and long life of the bearing has become an urgent problem to be solved by technical personnel in this field. Summary of the invention

[0005] Based on this, it is necessary to provide a radial bearing and an aircraft engine equipped with a radial bearing to address the technical defects in the existing technology that cannot take into account the stability, small size and long life of the bearing at the same time.

[0006] The present application provides a radial bearing, the radial bearing comprising: a bearing seat, an electromagnetic bearing part and a sliding bearing part, one end of the electromagnetic bearing part is mounted on the bearing seat, and the sliding bearing part is connected to the other end of the electromagnetic bearing part;

[0007] After the electromagnetic bearing unit is activated, it supports the sliding bearing unit.

[0008] In one embodiment, the electromagnetic bearing part includes: a stator pole, a rotor pole and a coil, one end of the stator pole is respectively connected to the bearing seat, the coil is wound on the outside of the stator pole, and the rotor pole is suspended at the other end of the stator pole.

[0009] In one embodiment, the number of the electromagnetic bearing parts is greater than two.

[0010] In one embodiment, the sliding bearing portion includes: a bearing bush, a rotating shaft and a fluid chamber;

[0011] One end of the bearing shell is connected to the bearing seat, the rotor pole is installed on the rotating shaft, the bearing seat is a closed annular bearing seat, the gap between the bearing shell and the rotating shaft is the fluid cavity, and the fluid cavity is filled with liquid.

[0012] In one embodiment, the other end of the bearing shell and the outer end of the rotating shaft form a matching wedge surface.

[0013] In one embodiment, the gap between the wedge surface and the rotating shaft is a first gap, the gap between the wedge surface and the bearing shell is a second gap, and the width of the first gap is greater than the width of the second gap.

[0014] In one of the embodiments, the liquid in the fluid chamber is lubricating oil.

[0015] In one of the embodiments, the bearing shells and the stator poles are arranged at intervals.

[0016] In one embodiment, the number of the bearing shells is greater than 3, and the number of the stator poles is greater than 3.

[0017] The present application also provides an aircraft engine, the aircraft engine comprising any one of the radial bearings described above, the radial bearing being mounted on a casing and / or a bracket of the aircraft engine.

[0018] In summary, the present application provides a radial bearing, which includes: a bearing seat, an electromagnetic bearing part and a sliding bearing part, one end of the electromagnetic bearing part is installed on the bearing seat, and the sliding bearing part is connected to the other end of the electromagnetic bearing part; after the electromagnetic bearing part is started, it supports the sliding bearing part. The present application also provides an aircraft engine, which includes the above-mentioned radial bearing, and the radial bearing is installed on the casing and / or bracket of the aircraft engine. In the technical solution provided by the present application, the electromagnetic support part provides auxiliary support for the sliding bearing part, effectively reduces the wear and loss of the sliding bearing part, and effectively prolongs the service life. The radial bearing and the aircraft engine equipped with the radial bearing provided by the present application solve the technical defects in the prior art that the bearing stability, small size and long service life cannot be taken into account at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 A schematic cross-sectional structure diagram of a radial bearing in the technical solution provided in the embodiment of the present application;

[0021] Among them, there are a bearing seat 1, a stator pole 2, a bearing shell 3, a coil 4, a rotor pole 5, a fluid cavity 6 and a rotating shaft 7. DETAILED DESCRIPTION

[0022] The embodiments of the present application provide a radial bearing and an aircraft engine equipped with the radial bearing, which are used to solve the technical defects in the prior art that the bearing stability, small size and long life cannot be taken into account at the same time.

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] See also Figure 1 The embodiment of the present application provides a radial bearing, comprising: a bearing seat 1, an electromagnetic bearing part and a sliding bearing part, one end of the electromagnetic bearing part is mounted on the bearing seat 1, and the sliding bearing part is connected to the other end of the electromagnetic bearing part; after the electromagnetic bearing part is started, it supports the sliding bearing part. The radial bearing provided in the embodiment of the present application solves the technical defect in the prior art that the bearing stability, small size and long life cannot be taken into account at the same time.

[0030] In the technical solution provided in the embodiment of the present application, after the electromagnetic bearing part and the sliding bearing part are both installed on the bearing frame, the electromagnetic force generated after the electromagnetic bearing is started will float part of the structure of the sliding bearing part, and play a certain supporting role on the sliding support part. This can reduce the wear of the sliding bearing part during operation and effectively extend the service life of the sliding bearing part.

[0031] At the same time, in a radial bearing provided in the present application, its main function is realized by relying on the sliding bearing part, so the stability of the radial bearing is relatively high; the electromagnetic bearing part plays an auxiliary supporting role for the sliding bearing part, even if the electromagnetic bearing part is damaged or the working condition is unstable, the radial bearing can still maintain stable operation; and at this time, the electromagnetic bearing part only plays an auxiliary supporting role, and its volume does not need to be too large, and the radial bearing as a whole will not take up a large space. Compared with using the electromagnetic bearing alone, the volume of the radial bearing of the present application is significantly reduced.

[0032] To further optimize the technical solution, while ensuring the supporting effect of the electromagnetic bearing part on the sliding bearing part, the design requirements of simplifying the structure of the electromagnetic bearing part and reducing the volume of the electromagnetic bearing part are taken into account. In a radial bearing provided in an embodiment of the present application, the electromagnetic bearing part includes: a stator pole 2, a rotor pole 5 and a coil 4, one end of the stator pole 2 is respectively connected to the bearing seat 1, the coil 4 is wound around the outside of the stator pole 2, and the rotor pole 5 is suspended at the other end of the stator pole 2.

[0033] One end of the stator pole 2 is connected and fixed to the bearing seat 1. In actual application, the stator pole 2 and the bearing seat 1 can be connected by a stopper and bolts, or can be designed and processed as an integrated whole with the bearing seat 1. After the coil 4 is wound around the stator pole 2, power is applied to the coil 4 to generate a magnetic field, and the rotor pole 5 is suspended at the other end of the stator pole 2.

[0034] In order to effectively improve the stability of the electromagnetic bearing part, in the technical solution provided in the embodiment of the present application, the number of electromagnetic bearing parts is greater than two; when some electromagnetic bearing parts are unstable, some can still maintain stable operation, effectively improving the stability of the overall structure of the radial bearing. At the same time, multiple electromagnetic bearing parts jointly provide auxiliary support for the sliding bearing part, share the force, and further optimize the auxiliary support effect for the sliding support part.

[0035] In a radial bearing provided in the present application, the sliding bearing part includes: a bearing bush 3, a rotating shaft 7 and a fluid cavity 6; one end of the bearing bush 3 is connected to the bearing seat 1, a rotor pole 5 is installed on the rotating shaft 7, the bearing seat 1 is a closed annular bearing seat 1, and the gap between the bearing bush 3 and the rotating shaft 7 is the fluid cavity 6, which is filled with liquid. In the actual application process, the bearing bush 3 and the bearing seat 1 can be connected by a stopper and a bolt, or can be designed and processed as an integrated whole with the bearing seat 1. In order to avoid interference between the bearing bush 3 and the electromagnetic bearing part, the bearing bush 3 is made of non-magnetic conductive material; the fluid cavity 6 between the bearing bush 3 and the rotating shaft 7 is filled with liquid, and the liquid can lubricate the rotating shaft 7.

[0036] To further optimize the technical solution, in the technical solution provided in the embodiment of the present application, the other end of the bearing 3 and the outer end of the rotating shaft 7 are mating wedge-shaped surfaces; the structural design of the wedge-shaped surface can produce a fluid dynamic pressure effect, provide fluid dynamic pressure during the rotation of the rotor pole 5, and cooperate with the electromagnetic bearing part to achieve stable suspension of the rotating shaft 7.

[0037] In a radial bearing provided in an embodiment of the present application, the gap between the wedge surface and the rotating shaft 7 is a first gap, the gap between the wedge surface and the bearing shell 3 is a second gap, and the width of the first gap is greater than the width of the second gap. The wedge surface can generate a fluid dynamic pressure effect when the rotating shaft 7 rotates, providing fluid dynamic pressure to support the rotating shaft 7. Usually, the wedge surface requires that the gap between the rotating shaft 7 and the bearing shell 3 is unequal. Furthermore, the lubricating oil inlet gap should be smaller than the lubricating oil outlet gap to form a wedge surface. In the actual application process, the gap design between the wedge surfaces is further adjusted accordingly considering the working state and load-bearing capacity of the sliding bearing.

[0038] In the technical solution provided in the embodiment of the present application, various functions of the liquid filled in the fluid cavity 6 are taken into consideration to better realize the liquid in the fluid cavity 6, and the liquid in the fluid cavity 6 is lubricating oil.

[0039] In order to evenly bear the force, make the bearing force of the sliding bearing part more uniform, and at the same time, the force transmission of the sliding bearing part is more uniform, in a radial bearing provided in an embodiment of the present application, the bearing shell 3 and the stator pole 2 are arranged at intervals.

[0040] In the technical solution provided in the embodiment of the present application, the number of bearings 3 is greater than 3, and the number of stator poles 2 is greater than 3. In order to ensure that the electromagnetic bearing works stably when the rotor poles 5 are stationary and running at low speed, two degrees of freedom need to be balanced between the poles, and the number of stator poles is greater than or equal to 3. Similarly, in order to ensure the normal operation of the sliding bearing, the number of bearings 3 is greater than or equal to 3. At the same time, in the process of actual application, the spatial layout of the stator poles 2 and the bearings 3 also needs to be considered according to the actual size specifications. The larger the size, the more stator poles 2 and bearings 3.

[0041] The embodiment of the present application also provides an aircraft engine including any one of the above radial bearings, and the radial bearing is installed in the casing and / or bracket of the aircraft engine. The radial bearing provided in the embodiment of the present application has the advantages of good stability, small size and long service life, can meet the use requirements of aircraft engines, and is widely installed and applied in aircraft engines.

[0042] In summary, the present application provides a radial bearing, which includes: a bearing seat, an electromagnetic bearing part and a sliding bearing part, one end of the electromagnetic bearing part is installed on the bearing seat, and the sliding bearing part is connected to the other end of the electromagnetic bearing part; after the electromagnetic bearing part is started, it supports the sliding bearing part. The present application also provides an aircraft engine, which includes the above-mentioned radial bearing, and the radial bearing is installed on the casing and / or bracket of the aircraft engine. In the technical solution provided by the present application, the electromagnetic support part provides auxiliary support for the sliding bearing part, effectively reduces the wear and loss of the sliding bearing part, and effectively prolongs the service life. The radial bearing and the aircraft engine equipped with the radial bearing provided by the present application solve the technical defects in the prior art that the bearing stability, small size and long service life cannot be taken into account at the same time.

[0043] The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. At the same time, other implementation methods can be derived from the above-mentioned embodiments, so that structural and logical replacements and changes can be made without departing from the scope of this disclosure.

[0044] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A radial bearing, characterized in that: The radial bearing comprises: a bearing seat, an electromagnetic bearing part and a sliding bearing part, one end of the electromagnetic bearing part is mounted on the bearing seat, and the sliding bearing part is connected to the other end of the electromagnetic bearing part; After the electromagnetic bearing unit is activated, it supports the sliding bearing unit.

2. The radial bearing according to claim 1, characterized in that: The electromagnetic bearing unit includes: a stator pole, a rotor pole and a coil, one end of each of the stator poles is connected to the bearing seat, the coil is wound around the outside of the stator pole, and the rotor pole is suspended at the other end of the stator pole.

3. The radial bearing according to claim 1 or 2, characterized in that: The number of the electromagnetic bearing parts is greater than two.

4. The radial bearing according to claim 2 or 3, characterized in that: The sliding bearing part includes: a bearing bush, a rotating shaft and a fluid chamber; One end of the bearing shell is connected to the bearing seat, the rotor pole is installed on the rotating shaft, the bearing seat is a closed annular bearing seat, the gap between the bearing shell and the rotating shaft is the fluid cavity, and the fluid cavity is filled with liquid.

5. The radial bearing according to claim 4, characterized in that: The other end of the bearing bush and the outer end of the rotating shaft form a matching wedge surface.

6. The radial bearing according to claim 5, characterized in that: The gap between the wedge-shaped surface and the rotating shaft is a first gap, the gap between the wedge-shaped surface and the bearing shell is a second gap, and the width of the first gap is greater than the width of the second gap.

7. The radial bearing according to claim 4 or 5, characterized in that: The liquid in the fluid cavity is lubricating oil.

8. The radial bearing according to claim 4, characterized in that: The bearing shells are spaced apart from the stator poles.

9. The radial bearing according to claim 7, characterized in that: The number of the bearing shells is greater than 3, and the number of the stator poles is greater than 3.

10. An aircraft engine, characterized in that: The aircraft engine comprises the radial bearing according to any one of claims 1 to 9, and the radial bearing is mounted on a casing and / or a bracket of the aircraft engine.

Images