CN114087279A

CN114087279A - Foil assembly, foil bearing, and air compressor

Info

Publication number: CN114087279A
Application number: CN202111537833.8A
Authority: CN
Inventors: 胡余生; 陈彬; 贾金信; 苏久展; 闫瑾; 陈振
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2022-02-25

Abstract

The invention provides a foil assembly, a foil bearing and an air compressor, wherein the foil assembly comprises a fixed outer ring, at least one layer of top foil and at least one layer of arched foil, a first through groove is formed in the fixed end of the top foil, a second through groove is formed in the fixed end of the arched foil, the fixed outer ring is provided with a first end and a second end, a first bending piece is arranged on the second end, and the free end of the first bending piece can sequentially penetrate through the first through groove and the second through groove to position and clamp the top foil and the arched foil by the first end and the second end. According to the invention, the first bending piece for fixing the outer ring can fix and position at least one layer of top foil and arched foil which are overlapped into a whole and then is assembled and fixed with the bearing seat, so that the fixing of the foils in the foil assembly and the assembling process between the foil assembly and the bearing seat can be simplified, and the defects caused by welding and pin fixing of multiple layers of foils in the prior art are effectively overcome.

Description

Foil assembly, foil bearing, and air compressor

Technical Field

The invention belongs to the technical field of foil bearing design, and particularly relates to a foil assembly, a foil bearing and an air compressor.

Background

The conventional whole-circle type foil bearing is divided into a top layer foil, an arch foil and a bearing seat, the simplest foil bearing is composed of the top layer foil and the arch foil, aiming at the foil bearing in the form, the conventional assembly method is to directly fix the top layer foil and the arch foil with the bearing seat, the most common fixing method is two modes of welding and pin fixing, and with the further and further research on the foil bearing and the continuous optimization of the performance of the foil bearing, the foil bearing composed of the top layer foil and the arch foil cannot meet the use requirements of people, the performance of the foil bearing is improved by increasing the number of layers of the foil, and with the increase of the number of layers, the defects of the fixing method of welding and pins are exposed more and more.

Wherein, the welding need use special welding equipment to stretch into the bearing frame inner circle and weld, under general conditions, the foil piece during welding is in free state at the bearing frame inner circle, consequently, no matter be single welding or double lamination welding, all can have the problem of welding infirm, and double lamination welding rosin joint rate is higher, the welding effect is also as far as ideal, so adopt the dislocation welding more, and along with the foil number of piles increases, the form of dislocation welding can make the "dead zone" of bearing increase of bearing, lead to the bearing characteristic of bearing to reduce, and adopt welded fixed mode in case need change the foil piece then need change whole bearing.

The mode that adopts the pin to fix easily receives the actual size's of spare parts such as pin, bearing frame fixed orifices and foil thickness influence, the condition that the too tight unable round pin of appearing or clearance fit lead to appearing the pin pine in the use easily appears, in addition, the axial float problem of foil still easily appears at the in-process of round pin income pin, and the fixed mode that adopts the pin can let the size increase of bearing frame, make the size grow of bearing position, and then arouse the whole size increase of model machine.

Disclosure of Invention

Therefore, the invention provides a foil assembly, a foil bearing and an air compressor, which can overcome the defects of increased dead bearing area, axial movement of the foil, increased size of a bearing seat and the like when the conventional manner of welding and pin fixing the foil is used for fixing the foil in a multi-layer foil bearing.

In order to solve the above problems, the present invention provides a foil assembly, which includes a fixed outer ring, at least one top foil, and at least one arched foil, wherein a fixed end of the top foil is configured with a first through groove, a fixed end of the arched foil is configured with a second through groove, the fixed outer ring is configured with a first end and a second end, the second end is provided with a first bending piece, and a free end of the first bending piece can sequentially pass through the first through groove and the second through groove to position and clamp the top foil and the arched foil by the first end and the second end.

In some embodiments, the first end is configured with a fixing groove, and the free end of the first bending piece can be embedded in the fixing groove after passing through the first through groove and the second through groove.

In some embodiments, the securing recess is a through slot.

In some embodiments, the fixed outer ring has an outer ring portion between the first end and the second end, the first end has a second bending tab, the second end has a third bending tab, the second and third bending tabs are parallel to each other, the first bending tab is on a side of the third bending tab away from the outer ring portion, and the fixing groove is configured on the second bending tab.

In some embodiments, the first end further has a fourth bending tab parallel to the second bending tab, the fourth bending tab being located outside the third bending tab, the fourth bending tab being capable of preventing the first bending tab from being removed from the fixing groove.

In some embodiments, the third and fourth tabs have first fold marks at respective junctions with the outer ring portion at axial ends of the fixed outer ring.

In some embodiments, the top foil has at least two layers, and each layer of the top foil has a top foil loop portion and a bent portion between a fixed end, which are sequentially attached from inside to outside along the radial direction of the fixed outer ring.

In some embodiments, when the first bending piece passes through the first through groove and the second through groove, the first bending piece can apply force to the fixed ends of the top foil and the arched foil outwards along a radial direction away from the fixed outer ring.

In some embodiments, the thickness of the first bending piece is d, the radial width of the first through groove is a, 1.1d ≧ a > d, and/or the radial width of the second through groove is b, 1.1d ≧ b > d.

The invention further provides a foil bearing which comprises a bearing seat and a foil assembly, wherein the foil assembly is the foil assembly.

The invention also provides an air compressor comprising the foil bearing.

According to the foil assembly, the foil bearing and the air compressor, the first bending piece of the fixed outer ring can fix and position at least one layer of top foil and the arched foil which are overlapped into a whole and then is assembled and fixed with the bearing seat, so that the fixing of the foils in the foil assembly and the assembling process between the foil assembly and the bearing seat can be simplified, and the defects caused by the fact that the multiple layers of foils are fixed by welding and pins in the prior art are effectively overcome.

Drawings

FIG. 1 is a schematic perspective view of a foil assembly according to an embodiment of the invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic view of an assembly structure of the top foil and the arched foil of FIG. 1;

FIG. 4 is a schematic view of a portion of the foil assembly of FIG. 1;

FIG. 5 is an assembled schematic view of the foil assembly of FIG. 1;

fig. 6 is a partial structural view of a foil bearing according to another embodiment of the present invention.

The reference numerals are represented as:

1. fixing the outer ring; 11. fixing the groove; 12. a first bending piece; 13. a second bending piece; 14. a third bending piece; 15. a fourth bending piece; 16. a first bend mark; 2. an arched foil; 3. a top foil; 31. a first through groove; 32. a second bend mark; 4. a bearing seat; 41. and (6) assembling the groove.

Detailed Description

Referring to fig. 1 to 6 in combination, according to an embodiment of the present invention, a foil assembly is provided, which includes a fixed outer ring 1, at least one top foil 3, and at least one arched foil 2, wherein a fixed end of the top foil 3 is configured with a first through groove 31, a fixed end of the arched foil 2 is configured with a second through groove (not shown, not referenced), the fixed outer ring 1 has a first end and a second end, the second end has a first bending piece 12, and a free end of the first bending piece 12 can sequentially pass through the first through groove 31 and the second through groove to position and clamp the top foil 3 and the arched foil 2 by the first end and the second end. In the technical scheme, the first bending piece 12 of the fixed outer ring 1 can fix and position at least one layer of top foil 3 and the arched foil 2 after being overlapped into a whole and then is assembled and fixed with the bearing seat 4, so that the fixation of the foils in the foil assembly and the assembly process between the foil assembly and the bearing seat 4 can be simplified, and the defects caused by welding and pin fixing of multiple layers of foils in the prior art are effectively overcome.

In some embodiments, the first end is configured with a fixing groove 11, and the free end of the first bending piece 12 can be inserted into the fixing groove 11 after passing through the first through groove 31 and the second through groove, so that the stability and reliability of clamping the foil by the first end and the second end can be improved. Further, the fixing groove 11 is a through groove, so that the manufacturing difficulty of the fixing groove 11 is reduced.

In a specific embodiment, the fixed outer ring 1 has an outer ring portion between the first end and the second end, the first end has a second bending piece 13, the second end has a third bending piece 14, the second bending piece 13 and the third bending piece 14 are parallel to each other, the first bending piece 12 is located on a side of the third bending piece 14 away from the outer ring portion, and the fixing groove 11 is formed on the second bending piece 13, it can be understood that the first end and the second end clamp the foil particularly through the second bending piece 13 and the third bending piece 14.

The first end still have with the parallel fourth bending piece 15 of second bending piece 13, fourth bending piece 15 is in the outside of third bending piece 14, fourth bending piece 15 can prevent first bending piece 12 is followed deviate from in the fixed recess 11, fourth bending piece 15 can be right first bending piece 12's position and then secondary reinforcement further guarantees centre gripping and reinforced reliability.

It can be understood that, in order to ensure the smooth assembly of the top foil 3 and the arched foil 2, the fixed outer ring 1 should be made of a material having a certain elastic deformability.

On the axial end part of the fixed outer ring 1, the joints of the third bending piece 14 and the fourth bending piece 15 and the outer ring part are respectively provided with a first bending mark 16 so as to guide an operator to manufacture the fixed outer ring 1, and it should be noted that the position determination of the first bending mark 16 needs to be finally determined according to the inner circumference of the bearing chamber and the specific number of foil layers of the bearing and according to experience values, and preferably, the assembly state that the fixed outer ring 1 and the bearing chamber are required to be heated and taken out after being assembled is the best.

In some embodiments, the top foil 3 has at least two layers, and a bent portion between a top foil loop portion and a fixed end of each layer of the top foil 3 is sequentially attached to the fixed outer ring 1 from inside to outside along a radial direction, so that confusion between an inner layer and an outer layer of the top foil 3 during assembly can be effectively prevented. Specifically, because the multilayer top foil 3 need be arranged along the radial from inside to outside of bearing in proper order when the equipment, consequently every the radius of bending of the department of bending of top foil 3 will be because the thickness of every layer of top foil 3 takes place to decrement (radially inside to outside), and when multilayer top foil 3 need be assembled, how when the top foil 3 of the outer floor was put conversely, the bending of two top foil 3 will not laminate, and then the suggestion operating personnel change the number of piles of top foil 3 also is the position of the inside and outside, realizes the mistake proofing effect in the assembly process.

Preferably, when the first bending piece 12 passes through the first through groove 31 and the second through groove, the first bending piece 12 can apply force to the fixed ends of the top foil 3 and the arched foil 2 outwards along the radial direction away from the fixed outer ring 1, so as to ensure that the fixed ends of the foils have an outwards pulling force after being assembled, and the fixed ends of the foils are in an inwards tensioned state, and therefore, the advantage of the arrangement is that firstly, the fixed ends of the foils are ensured not to exceed the inner circular surface of the top foil 3 inwards, and the fixed ends of the foils are prevented from generating interference friction with a rotor in the rotation and self-running process, so that the reliability of a bearing is reduced locally due to the friction; secondly, the fixed end of each layer of foil has an outward pulling force after the assembly is completed, and the fixed end is in an inward tensioning state, so that a certain damping force can exist when the bearing is assembled, the first bending piece 12 of the fixed outer ring 1 can have obvious perception when passing through the first through groove 31 and the second through groove of each layer of foil and being clamped into the fixed groove 11, a person who prepares the bearing can conveniently judge whether the bearing is assembled in place, meanwhile, when the fourth bending piece 15 is pried when the bearing is disassembled, each layer of foil in the bearing can be automatically popped out, and the convenience of disassembly is ensured. In a specific embodiment, a second bending mark 32 is disposed at one axial end of the top foil 3 or the arched foil 2, and the second bending mark 32 is used as a reference point to determine the relative position between the fixing groove 11 and the first through groove 31 and the second through groove, for example, the distance between the radially outer groove walls of the first through groove 31 and the second through groove and the second bending mark 32 is slightly smaller than the distance between the radially outer groove wall of the fixing groove and the second bending mark 32, and specifically, the distance between the radially outer groove walls of the first through groove 31 and the second through groove and the second bending mark 32 may be a negative tolerance value (-0.03mm to-0.05 mm).

In order to ensure that the first bending piece 12 can smoothly penetrate into the first through groove 31 and the second through groove, the thickness of the first bending piece 12 is d, the radial width of the first through groove 31 is a, 1.1d is larger than or equal to a and larger than d, and/or the radial width of the second through groove is b, 1.1d is larger than or equal to b and larger than d.

According to an embodiment of the present invention, a foil bearing, in particular a multilayer foil type dynamic pressure bearing, is also provided, which includes a bearing seat 4 and a foil assembly, wherein the foil assembly is the above-mentioned foil assembly. Specifically, as shown in fig. 6, an assembly groove 41 is formed on the inner wall of the bearing chamber of the bearing seat 4, and the foil assembly is clamped and positioned by the first end and the second end of the fixed outer ring 1 with respect to the top foil 3 and the arched foil 2 and then is embedded in the assembly groove 41, so that reliable and convenient assembly between the foil assembly and the bearing chamber is realized.

There is also provided, in accordance with an embodiment of the present invention, an air compressor including the foil bearing described above.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a foil piece subassembly, its characterized in that, is including fixed outer lane (1), at least one deck top layer foil piece (3), at least one deck arch foil piece (2), the stiff end of top layer foil piece (3) is constructed with first logical groove (31), the stiff end of arch foil piece (2) is constructed with the second and link up the groove, fixed outer lane (1) has first end and second end, the second is served and is had first bending piece (12), the free end of first bending piece (12) can pass in proper order first logical groove (31), second link up the groove in order to realize first end with the second end is to the location and the centre gripping of top layer foil piece (3) and arch foil piece (2).

2. Foil assembly according to claim 1, wherein the first end is configured with a fixing recess (11), and the free end of the first bending tab (12) can be inserted into the fixing recess (11) after passing through the first through slot (31) and the second through slot.

3. Foil assembly according to claim 2, wherein the fixing groove (11) is a through slot.

4. Foil assembly according to claim 2, wherein the fixed outer ring (1) has an outer ring collar between the first end and the second end, the first end having a second bending tab (13), the second end having a third bending tab (14), the second bending tab (13) and the third bending tab (14) being parallel to each other, the first bending tab (12) being on a side of the third bending tab (14) facing away from the outer ring collar, the fixing groove (11) being configured on the second bending tab (13).

5. Foil assembly according to claim 4, wherein the first end further has a fourth fold (15) parallel to the second fold (13), the fourth fold (15) being outside the third fold (14), the fourth fold (15) being capable of preventing the first fold (12) from escaping from the fixing groove (11).

6. Foil assembly according to claim 4, wherein the third and fourth tabs (14, 15) have first fold markings (16) at their respective connections to the outer ring portion at the axial ends of the fixed outer ring (1).

7. Foil assembly according to claim 1, wherein the top foil (3) has at least two layers, and each layer of top foil (3) has a top foil loop portion and a bending portion between fixed ends, which are sequentially attached from inside to outside along the radial direction of the fixed outer ring (1).

8. Foil assembly according to claim 1, wherein the first bending tabs (12) are capable of forcing the fixed ends of the top foil (3) and the arched foil (2) outwards in a radial direction away from the fixed outer ring (1) when the first bending tabs (12) pass through the first through slots (31), the second through slots.

9. Foil assembly according to claim 8, wherein the first bending tab (12) has a thickness d, the first through going slot (31) has a radial width a, 1.1% d ≧ a > d, and/or the second through going slot has a radial width b, 1.1d ≧ b > d.

10. A foil bearing comprising a bearing housing (4), a foil assembly, characterized in that the foil assembly is a foil assembly according to any one of claims 1-9.

11. An air compressor comprising the foil bearing of claim 10.