A radial foil bearing

Abstract

The present invention belongs to the technical field of air foil bearings, and specifically relates to a radial foil bearing, comprising a bearing sleeve and multiple groups of elastic components; the inner side wall of the bearing sleeve is provided with multiple slots, and the slots are arranged at equal intervals along the circumference of the bearing sleeve; the elastic component comprises a top foil and an elastic foil A, the top foil comprises an inserting portion and an extending portion, the top foil is inserted in the slot through the inserting portion, the extending portion extends along the circumference of the bearing sleeve, and all the extending portions are connected end to end in sequence to form an annular structure; the elastic foil A is arranged between the top foil and the bearing sleeve. The top foil and the elastic foil A in the radial foil bearing have simple structures, and their production can be completed by simple bending, so that the requirements for the processing accuracy of the radial foil bearing are reduced to reduce its production cost, and the structure of the elastic foil A increases its contact area with the top foil, thereby effectively improving the damping characteristics of the radial foil bearing, making the application range of the radial foil bearing wider.

Description

Technical Field

[0001] The invention belongs to the technical field of air foil bearings, and in particular relates to a radial foil bearing. Background Art

[0002] The common air foil bearing is a dynamic pressure air bearing with a good flexible surface composed of one or more layers of corrugated foil and top foil. It relies on the relative movement of the shaft and the bearing surface to enable the rotating shaft to suck gas with a certain viscosity into the wedge-shaped space between the shaft and the bearing top foil for extrusion, forming a lubricating gas film with a certain pressure, thereby suspending the rotating shaft.

[0003] Air foil bearing principle Figure 1 As shown, when there is a wedge-shaped space between two relatively moving surfaces, the surfaces moving against each other continuously drive the gas into the wedge-shaped groove, so that a dynamic pressure air film with a certain pressure is formed in the wedge-shaped groove. When the air film pressure is large enough to support the load, the shaft will be suspended and the friction will disappear.

[0004] Air foil bearings have a series of advantages such as low friction loss, almost no friction at extremely high speeds, good high temperature stability, low vibration, and no need for lubricating oil. They are widely used in air cycle machines, air blowers, fuel cell air compressors, micro gas turbines and other machinery. They have very broad application prospects in the fields of low and high temperature technology, high-speed turbines and space technology.

[0005] However, the manufacturing process of common corrugated foil air foil bearings is long and complex, and the installation precision is high and the manufacturing consistency is difficult to control. Under complex working conditions such as vehicle-mounted fuel cell air compressors, the air foil bearings have low damping and poor impact resistance, which limits their application development to a certain extent. Therefore, providing an air foil bearing with a simple structure and high damping is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a radial foil bearing to solve the technical problem that the air foil bearing existing in the prior art has a complex structure and low damping, which leads to its limited use.

[0007] The present invention is specifically implemented through the following technical solutions:

[0008] A radial foil bearing comprises a bearing sleeve and a plurality of sets of elastic components;

[0009] The inner side wall of the bearing sleeve is provided with a plurality of slots, and the slots are arranged at equal intervals along the circumference of the bearing sleeve;

[0010] The elastic component includes a top foil and an elastic foil A, the top foil includes an inserting portion and an extending portion, the top foil is inserted into the slot through the inserting portion, the extending portion located on the inner side wall of the bearing sleeve extends along the circumferential direction of the bearing sleeve, and all the extending portions are connected end to end in sequence to form an annular structure; the elastic foil A is arranged between the top foil and the bearing sleeve.

[0011] In order to better realize the present invention, further optimization is made in the above structure, the elastic foil A includes a first fixed part and a first elastic part, the elastic foil A is inserted in the slot through the first fixed part, and the first elastic part is located between the extension part and the bearing sleeve.

[0012] In order to better implement the present invention, further optimization is made in the above structure, and the elastic component further includes an elastic foil B, and the elastic foil B is arranged between the first elastic part and the extension part.

[0013] In order to better implement the present invention, further optimization is made in the above structure, the elastic foil B includes a second fixed portion and a second elastic portion, the elastic foil B is inserted into the slot through the second fixed portion, and the second elastic portion is located between the extension portion and the first elastic portion.

[0014] In order to better implement the present invention, further optimization is made in the above structure. The number of the elastic foils A in each group of the elastic components is at least two, and the elastic foil B is arranged between two adjacent elastic foils A.

[0015] In order to better implement the present invention, further optimization is made in the above structure. The elastic foil A and the elastic foil B are both "L"-shaped structures. Two elastic foils B are arranged in the slot, and the second elastic parts of the two elastic foils B are oriented in opposite directions.

[0016] In order to better implement the present invention, further optimization is made in the above structure, and the thickness of the two second fixing parts matches the width of the slot.

[0017] In order to better implement the present invention, further optimization is made in the above structure, and the elastic foil A and the elastic foil B are both "T"-shaped structures.

[0018] In order to better implement the present invention, further optimization is made in the above structure, and the number of the elastic components is three groups.

[0019] In order to better implement the present invention, further optimization is made in the above structure, and the width of the card slot matches the thickness of the top foil.

[0020] In summary, the present invention has the following technical effects:

[0021] The top foil and the elastic foil A in the radial foil bearing have simple structures and can be produced by simple bending, which reduces the processing accuracy requirements of the radial foil bearing and reduces its production cost. The structure of the elastic foil A increases the contact area with the top foil, thereby effectively improving the damping characteristics of the radial foil bearing and making the application range of the radial foil bearing wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is the schematic diagram of the air foil bearing;

[0024] Figure 2 It is a schematic structural diagram of a radial foil bearing of the present invention;

[0025] Figure 3 It is a schematic structural diagram of an elastic component in a radial foil bearing of the present invention;

[0026] Figure 4 It is a schematic structural diagram of a top foil in a radial foil bearing of the present invention;

[0027] Figure 5 It is a schematic structural diagram of an elastic foil A in a radial foil bearing of the present invention;

[0028] Figure 6 It is a schematic structural diagram of an elastic foil B in a radial foil bearing of the present invention;

[0029] Figure 7 It is a structural schematic diagram of a bearing sleeve in a radial foil bearing of the present invention;

[0030] Figure 8 It is a schematic structural diagram of a radial foil bearing of the present invention in which the elastic foil B is linear.

[0031] Reference numerals:

[0032] 1. Bearing sleeve; 2. Top foil; 21. Insertion part; 22. Extension part; 3. Elastic foil A; 32. First fixing part; 31. First elastic part; 4. Elastic foil B; 42. Second fixing part; 41. Second elastic part; 5. Slot. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0034] Example:

[0035] like Figures 2 to 8 As shown:

[0036] A radial foil bearing comprises a bearing sleeve 1 and a plurality of elastic components;

[0037] The inner side wall of the bearing sleeve 1 is provided with a plurality of slots 5, and the slots 5 are arranged at equal intervals along the circumference of the bearing sleeve 1;

[0038] The elastic component includes a top foil 2 and an elastic foil A3. The top foil 2 includes an insert portion 21 and an extension portion 22. The top foil 2 is inserted into the slot 5 through the insert portion 21. The extension portion 22 located on the inner wall of the bearing sleeve 1 extends along the circumference of the bearing sleeve 1. All the extension portions 22 are connected end to end in sequence to form an annular structure. The elastic foil A3 is arranged between the top foil 2 and the bearing sleeve 1.

[0039] The top foil 2 and the elastic foil A3 in the radial foil bearing of the above structure are simple in structure, and the top foil 2 and the elastic foil A3 can be produced by simply bending, which reduces the processing accuracy requirements of the radial foil bearing, facilitates the mass production of the radial foil bearing, and effectively reduces its production cost;

[0040] Furthermore, the structure of the elastic foil A3 increases the contact area between the elastic foil A3 and the top foil 2, thereby improving the damping characteristics of the radial foil bearing and making the application range of the radial foil bearing wider.

[0041] Optimally, the elastic foil A3 comprises a first fixing portion 32 and a first elastic portion 31; wherein,

[0042] There is a certain angle between the plane where the first fixing portion 32 and the first elastic portion 31 are located. The elastic foil A3 is inserted into the slot 5 through the first fixing portion 32, and the first elastic portion 31 is located between the top foil 2 and the bearing sleeve 1 to support the top foil 2, thereby effectively improving the impact resistance of the radial foil bearing.

[0043] Optimally, the elastic component further includes an elastic foil B4 , and the elastic foil B4 is located between the first elastic portion 31 and the extension portion 22 .

[0044] Specifically, the elastic foil B4 includes a second fixing portion 42 and a second elastic portion 41; wherein,

[0045] There is a certain angle between the second fixed portion 42 and the plane where the second elastic portion 41 is located. The elastic foil B4 is inserted into the slot 5 through the second fixed portion 42. The second elastic portion 41 is an arc-shaped structure, and the second elastic portion 41 is located between the first elastic portion 31 and the extension portion 22. The preload can be increased through the arc-shaped second elastic portion 41 to improve the impact resistance of the radial foil bearing.

[0046] In addition, the second elastic portion 41 is located between the first elastic portion 31 and the extension portion 22, which can effectively increase the Coulomb friction between the second elastic portion 41 and the top foil 2 and the first elastic portion 31 during operation of the radial foil bearing, thereby effectively improving the damping characteristics of the radial foil bearing.

[0047] It should be noted that the radius of the second elastic portion 41 is not less than the radius of the bearing sleeve 1, and the second elastic portion 41 can also be set as a linear structure (such as Figure 8 As shown), the specific setting can be made according to the requirements to meet the preload requirement of the radial foil bearing.

[0048] Optimally, each group of elastic components includes at least two elastic foils A3, the extension portion 22 covers the first elastic portion 31 of the two elastic foils A3, the above-mentioned elastic foil B4 is inserted in the slot 5 between the two elastic foils A3, and the second elastic portion 41 in the elastic foil B4 is located between the first elastic portion 31 and the extension portion 22.

[0049] Optimally, the elastic foil A3 and the elastic foil B4 are both in an "L" shape, and the first fixing portion 32 and the second fixing portion 42 are both the shorter side of the "L" shape, and the first elastic portion 31 and the second elastic portion 41 are the longer side of the "L" shape;

[0050] The elastic foils B4 are arranged in groups of two, i.e., two elastic foils B4 are inserted into one slot 5, and the second elastic portions 41 in the two elastic foils B4 face in opposite directions, respectively covering the elastic foils A3 on both sides of the elastic foils B4, so as to increase the contact area between the elastic foils A3 and B4.

[0051] Preferably, the thickness of the two second fixing portions 42 matches the width of the slot 5, that is, the two elastic foils B4 can be tightly clamped in the slot 5 through the second fixing portions 42, so that the two elastic foils B4 will not fall out of the slot 5, thereby making the structure of the radial foil bearing more stable.

[0052] In addition, the shape of the elastic foil A3 and the elastic foil B4 can also be set to a "T"-shaped structure, that is, the elastic foil A3 and the elastic foil B4 are each a group of two, and the two elastic foils A3 and the two elastic foils B4 are integrally formed components, so that the two "L"-shaped elastic foils A3 form a "T"-shaped elastic foil A3, and the two "L"-shaped elastic foils B4 form a "T"-shaped elastic foil B4.

[0053] Preferably, the number of the elastic components is three, and the three groups of elastic components are sequentially arranged around the center of the bearing sleeve 1, so that the top foil 2 is butted end to end to form a ring.

[0054] Preferably, the width of the above-mentioned slot 5 matches the thickness of the top foil 2, so that the top foil 2 can be tightly clamped in the slot 5, making the structure of the radial foil bearing more stable.

[0055] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A radial foil bearing, characterized in that: It comprises a bearing sleeve (1) and a plurality of sets of elastic components; The inner side wall of the bearing sleeve (1) is provided with a plurality of slots (5), and the slots (5) are arranged at equal intervals along the circumference of the bearing sleeve (1); The elastic component comprises a top foil (2) and an elastic foil piece A (3); the top foil (2) comprises an inserting portion (21) and an extending portion (22); the top foil (2) is inserted into the slot (5) via the inserting portion (21); the extending portion (22) located on the inner side wall of the bearing sleeve (1) extends along the circumference of the bearing sleeve (1); all the extending portions (22) are connected end to end in sequence to form an annular structure; the elastic foil piece A (3) is arranged between the top foil (2) and the bearing sleeve (1); The elastic foil A (3) comprises a first fixing portion (32) and a first elastic portion (31), the elastic foil A (3) being inserted into the slot (5) via the first fixing portion (32), and the first elastic portion (31) being located between the extension portion (22) and the bearing sleeve (1); The elastic component further comprises an elastic foil B (4), wherein the elastic foil B (4) is arranged between the first elastic portion (31) and the extension portion (22); The elastic foil B (4) comprises a second fixing portion (42) and a second elastic portion (41); the elastic foil B (4) is inserted into the clamping slot (5) via the second fixing portion (42); and the second elastic portion (41) is located between the extending portion (22) and the first elastic portion (31); The number of the elastic foils A (3) in each group of the elastic components is at least two; Two elastic foils B (4) are arranged in the slot (5), and the second elastic parts (41) in the two elastic foils B (4) are oriented in opposite directions; The radius of the second elastic portion (41) is not less than the radius of the bearing sleeve (1).

2. The radial foil bearing according to claim 1, characterized in that: The elastic foil A (3) and the elastic foil B (4) are both "L"-shaped structures.

3. The radial foil bearing according to claim 2, characterized in that: The thickness of the two second fixing portions (42) matches the width of the clamping slot (5).

4. The radial foil bearing according to any one of claims 1 to 3, characterized in that: The number of the elastic components is three groups.

5. The radial foil bearing according to claim 1, characterized in that: The width of the card slot (5) matches the thickness of the top foil (2).

Images