CN215762786U - Gas thrust bearing, compressor and air conditioning system - Google Patents
Gas thrust bearing, compressor and air conditioning system Download PDFInfo
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- CN215762786U CN215762786U CN202122388132.4U CN202122388132U CN215762786U CN 215762786 U CN215762786 U CN 215762786U CN 202122388132 U CN202122388132 U CN 202122388132U CN 215762786 U CN215762786 U CN 215762786U
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Abstract
The utility model relates to a gas thrust bearing, a compressor and an air conditioning system, wherein the gas thrust bearing comprises: a bearing housing; one end of the smooth foil piece along the circumferential direction is a fixed end connected with the bearing shell; a first bump foil disposed between the smooth foil and the bearing housing; and the second wave foil is arranged between the smooth foil and the bearing shell side by side with the first wave foil along the circumferential direction, the first wave foil is positioned at the fixed end of the smooth foil, the second wave foil is positioned at one side of the first wave foil, which is far away from the fixed end of the smooth foil, and the rigidity of the second wave foil is greater than that of the first wave foil. By applying the technical scheme of the utility model, the second wave foil with higher rigidity is adopted in the main bearing area far away from the fixed end of the smooth foil, so that the problem of failure caused by overlarge deformation of the wave foil is avoided; the first bump foil with lower rigidity is adopted in the non-main bearing area close to the smooth foil, so that the dynamic pressure air film can be smoothly formed when the rotor rotates at a low speed.
Description
Technical Field
The utility model relates to the field of mechanical parts, in particular to a gas thrust bearing, a compressor and an air conditioning system.
Background
The bearing is an essential basic component in a rotating machine, and common bearings include a rolling bearing, a sliding bearing, a magnetic suspension bearing and the like. With the development of science and technology at any time, people put higher requirements on the aspects of oillessness and high precision of bearings, and the novel air bearing technology comes along.
The air bearing is classified into a static pressure air bearing and a dynamic pressure air bearing according to a generation mechanism of a lubricating air film, as shown in fig. 1, a bump foil type dynamic pressure air thrust bearing is one of the dynamic pressure air foil bearings, as shown in fig. 1, a typical bump foil type dynamic pressure air thrust bearing includes a bearing housing 1, a bump foil 2 and a top foil 3, and the bump foil type dynamic pressure air thrust bearing provides axial rigidity and damping for a rotor system. Like the pads of the lubricating oil thrust bearing, the top foil 3 of the wave foil type dynamic pressure gas thrust bearing is generally designed in a fan shape to function as a pad. For uniform force, the top foil 3 is evenly distributed in the circumferential direction.
The corrugated foil 2 under the top foil 3 has a special corrugated structure and plays a role of elastic support, and the corrugated foil 2 is a main source of rigidity and damping of the dynamic pressure gas thrust bearing. As shown in fig. 1, one end of the bump foil 2 and the top foil 3 is fixed on the bearing housing 1, and the other end is a free end. As shown in fig. 1, one end of the bump foil 2 and the top foil 3 in the circumferential direction is provided with a welding point 4 for connecting the bump foil 2 and the top foil 3 with the bearing housing 1. As shown in fig. 2, a convergent included angle exists between the front end of the top foil 3 and the bearing housing 1 to form a wedge-shaped gap 6 for gas to enter, and the rear end of the top foil 3 is parallel to the bearing housing 1, so that when the rotor rotates at a high speed, a dynamic pressure gas film is formed under the action of the convergent included angle to support the rotor. The aforementioned rear end is located downstream of the front end in the direction of rotation a.
As is apparent from the above description, the key to the operation of the wave foil type dynamic pressure gas thrust bearing is the formation of a dynamic pressure gas film. As shown in fig. 3 to 5, the principle of the formation of the dynamic pressure gas film is: the dynamic pressure gas thrust bearing is stationary, the rotor 7 drives the thrust disk 5 to rotate at high speed, and thus the gas between the thrust disk 5 and the thrust bearing is driven to move along the direction of arrow A in figures 3, 4 and 5. The gas enters from the wedge-shaped gap 6 with a higher gap, and then the gas pressure is increased along with the decrease of the gap between the top foil 3 and the thrust disc 5, so that a dynamic gas film 8 with a certain supporting function is formed. The distance between one end of the top foil 3 close to the wedge-shaped gap 6 and the bearing shell 1 is gradually increased along the direction close to the inner side to form the wedge-shaped gap 6, and one end of the bump foil 2 close to the wedge-shaped gap 6 is provided with a height gradually-changing section 9.
However, in the typical bump foil type thrust gas bearing described above, if the load of the bump foil 2 is too large to exceed its elastic limit, the wave shape of the bump foil is flattened and the wave shape cannot be restored, and the thrust gas bearing cannot effectively form a dynamic pressure gas film due to the deformation of the bump foil. During actual operation, once the dynamic pressure gas film fails and the rotor continues to rotate at high speed, the thrust bearing and the dynamic pressure gas thrust bearing collide, so that the rotor and the bearing are damaged.
When the rotor 7 rotates at a higher rotating speed, the pressure of the air film between the thrust disc 5 and the top foil 3 rotating along with the rotor is higher, and the rigidity requirement of the dynamic pressure air thrust bearing is correspondingly higher. At this time, if the rigidity of all the bump foils is increased, the hydrodynamic gas bearing is difficult to form a hydrodynamic film at a low rotation speed of the rotor, so that dry friction occurs between the top foil 3 and the thrust disk 5, and the service life of the bearing is reduced
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a gas thrust bearing, a compressor and an air conditioning system, which aim to solve the problem that a wave foil of the gas thrust bearing is easy to fail when the load is overlarge in the related art.
According to an aspect of an embodiment of the present invention, there is provided a gas thrust bearing including:
a bearing housing;
one end of the smooth foil piece along the circumferential direction is a fixed end connected with the bearing shell;
a first bump foil disposed between the smooth foil and the bearing housing; and
and the second wave foil and the first wave foil are arranged between the smooth foil and the bearing shell side by side along the circumferential direction of the gas thrust bearing, the first wave foil is positioned at the fixed end of the smooth foil, the second wave foil is positioned on one side of the first wave foil, which is far away from the fixed end of the smooth foil, and the rigidity of the second wave foil is greater than that of the first wave foil.
In some embodiments of the present invention, the,
the wavelength of the first bump foil is larger than that of the second bump foil; and/or
The wave height of the first bump foil is larger than that of the second bump foil; and/or
The rigidity of the material of the second bump foil is greater than that of the material of the first bump foil; and/or
The thickness of the first bump foil is smaller than that of the second bump foil.
In some embodiments, the wave height of the first bump sheet is greater than the wave height of the second bump sheet, and the bearing housing includes a first bearing surface for bearing the first bump sheet and a second bearing surface for bearing the second bump sheet, the second bearing surface having a height greater than the first bearing surface.
In some embodiments, one end of the first bump foil piece adjacent to the fixed end of the smooth foil piece is connected to the bearing housing, and the other end of the first bump foil piece abuts against the second bump foil piece.
In some embodiments, the end of the smooth foil remote from the fixed end is a free end, and the second bump foil extends from the first bump foil to the free end of the smooth foil.
In some embodiments, a portion of the smooth foil near the fixed end is an inclined portion inclined with respect to the bearing housing, a distance between the inclined portion and the bearing housing gradually increases in a direction away from the fixed end to form an air inlet portion into which air is introduced, the first wave foil is at least partially located between the inclined portion and the bearing housing,
the wave height of the first bump foil piece is gradually increased along with the distance from the fixed end of the smooth foil piece, so that one end of the first bump foil piece, which is far away from the bearing shell, is abutted against the inclined part; or
The wavelength of the first bump foil becomes longer as it is farther from the fixed end of the smooth foil.
In some embodiments of the present invention, the,
the first bump sheet comprises a plurality of first wave structures arranged side by side along the circumferential direction; and/or
The second bump sheet includes a plurality of second wave structures arranged side by side in the circumferential direction.
In some embodiments, the gas thrust bearing comprises a hydrodynamic gas thrust bearing.
According to another aspect of the present invention, there is also provided a compressor, which in some embodiments includes the above-described gas thrust bearing.
According to another aspect of the utility model, an air conditioning system is also provided, which comprises the gas thrust bearing.
By applying the technical scheme of the utility model, the second wave foil with higher rigidity is adopted in the main bearing area far away from the fixed end of the smooth foil, so that the problem of failure caused by overlarge deformation of the wave foil is avoided; the first bump foil with lower rigidity is adopted in the non-main bearing area close to the smooth foil, so that the dynamic pressure air film can be smoothly formed when the rotor rotates at a low speed.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the related art, the drawings needed to be used in the description of the embodiments or the related art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a schematic structural view of a related art gas thrust bearing;
FIG. 2 shows a schematic cross-sectional view at B in FIG. 1;
FIG. 3 is a schematic view showing a structure of a gas thrust bearing and a rotor of the related art;
FIG. 4 is a schematic cross-sectional view of a gas thrust bearing and rotor of the related art;
FIG. 5 is a schematic cross-sectional view of a gas thrust bearing and rotor of the related art;
fig. 6 shows a schematic cross-sectional structure of a gas thrust bearing of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 6, the gas thrust bearing of the present embodiment includes a bearing housing 1, a smoothing foil 4, a first bump foil 3, and a second bump foil 2. The gas thrust bearing of the present embodiment comprises a hydrodynamic gas thrust bearing.
Wherein, one end of the smooth foil 4 along the circumferential direction is a fixed end connected with the bearing housing 1. The other end of the smooth foil 4 in the circumferential direction is a free end. The smooth foil 4 is located outside the first bump foil 3 and the second bump foil 2, the smooth foil 4 also being referred to as top foil.
The first bump foil 3 is arranged between the smooth foil 4 and the bearing housing 1 and extends along the circumferential direction of the gas thrust bearing, and one end of the first bump foil 3 close to the fixed end of the smooth foil 4 is connected with the bearing housing 1. The second bump foil piece 2 and the first bump foil piece 3 are arranged between the smooth foil piece 4 and the bearing shell 1 side by side along the circumferential direction of the gas thrust bearing, the first bump foil piece 3 is adjacent to the fixed end of the smooth foil piece 4, the second bump foil piece 2 is positioned on one side of the first bump foil piece 3 far away from the fixed end of the smooth foil piece 4, and the rigidity of the second bump foil piece 2 is larger than that of the first bump foil piece 3.
In some embodiments, the first bump sheet 3 includes a plurality of first wave structures arranged side by side in the circumferential direction; the second bump sheet 2 includes a plurality of second wave structures arranged side by side in the circumferential direction.
One end of the first bump foil 3 adjacent to the fixed end of the smooth foil 4 is connected to the bearing housing 1, and the other end of the first bump foil 3 abuts against the second bump foil 2. In some embodiments, the end of the first bump foil 3 adjacent to the second bump foil 2 is a free end.
The end of the smooth foil 4 far from the fixed end is a free end, and the second bump foil 2 extends from the first bump foil 3 to the free end of the smooth foil 4. In some embodiments, one end of the second bump sheet 2 close to the first bump sheet 3 is fixedly connected to the bearing housing 1, and the other end of the second bump sheet 2 is a free end. The fixed end of the smooth foil 4 is the air inlet end.
In some embodiments, the fixed end of the smooth foil 4 is welded with the bearing housing 1. In some embodiments, the end of the first bump foil 3 near the fixed end of the smooth foil 4 is welded to the bearing housing 1. In some embodiments, the end of the second bump foil 2 close to the first bump foil 3 is welded to the bearing housing 1.
In this embodiment, the end (e.g., fixed end, free end) refers to a region adjacent to the end of the component, and not just to the end. That is, the "first bump foil 3 is provided at the fixed end of the smooth foil" is equivalent to "the first bump foil 3 is located between a portion near the fixed end of the smooth foil 4 and the bearing housing 1".
In actual operation, the load is not evenly distributed over the smooth foil 4, but is mainly concentrated on the area close to the free end of the smooth foil 4. The stiffness and reliability of the gas thrust bearing is therefore mainly dependent on the load-bearing capacity of the bump foil near the free end.
When the rotor rotates at a higher rotating speed, the pressure of an air film between the thrust disk 6 and the smooth foil 4 rotating along with the rotor is higher, and the rigidity requirement of the dynamic pressure air thrust bearing is correspondingly higher. At this time, if the rigidity of all the bump foils is increased, the hydrodynamic gas bearing is difficult to form a hydrodynamic film at a low rotation speed of the rotor, so that dry friction occurs between the smooth foil 4 and the thrust disk 6, and the service life of the bearing is reduced. In order to solve this problem, the gas thrust bearing of the present embodiment is provided with the first bump foil 3 having a small rigidity at a position close to the fixed end of the smooth foil 4, so that the gas thrust bearing can form a dynamic pressure gas film at a low rotation speed.
In some embodiments, the wavelength of the first bump foil 3 is greater than the wavelength of the second bump foil 2, so that the stiffness of the second bump foil 2 is greater than the stiffness of the first bump foil 3. In other embodiments, the wave height of the first bump foil 3 is larger than the wave height of the second bump foil 2, so that the stiffness of the second bump foil 2 is larger than the stiffness of the first bump foil 3.
In other embodiments the material of the second bump foil 2 has a stiffness which is greater than the stiffness of the material of said first bump foil 3, so that the stiffness of the second bump foil 2 is greater than the stiffness of the first bump foil 3.
In other embodiments, the thickness of the first bump foil 3 is smaller than the thickness of the second bump foil 2, so that the stiffness of the second bump foil 2 is greater than the stiffness of the first bump foil 3.
In the present embodiment, the wave height of the first bump foil 3 is greater than the wave height of the second bump foil 2, and the bearing housing 1 includes a first bearing surface for bearing the first bump foil 3 and a second bearing surface for bearing the second bump foil 2, and the height of the second bearing surface is greater than the first bearing surface.
It should be noted that the fact that the wave height of the first bump foil 3 is greater than the wave height of the second bump foil 2 means that the wave height of the main body of the first bump foil 3 is greater than the wave height of the main body of the second bump foil 2, and does not exclude the case where the first bump foil 3 has a wave height smaller than the second bump foil 2 individually due to structural restrictions of the bearing, for example, the portion of the first bump foil 3 near the air inlet end of the bearing includes a plurality of wave structures gradually decreasing in wave height toward the air inlet end to form the wedge-shaped air inlet 7.
The bearing housing 1 comprises a first portion and a second portion of different thickness, the first portion having a smaller thickness than the second portion, the surface of the first portion on the side adjacent to the plain foil forming a first bearing surface and the surface of the second portion on the side adjacent to the plain foil forming a second bearing surface.
In the working process, the rotating speed of the rotor is gradually increased, and when the rotating speed is low, the required rigidity requirement is low, and at the moment, the first bump foil 3 plays a bearing role firstly. According to the characteristics of the wave foil type dynamic pressure gas bearing, the first wave foil piece 3 is designed into a wave shape with higher wave height and larger span, so that a dynamic pressure gas film can be formed when the bearing rotates at a lower speed.
With the increase of the rotating speed of the rotor, the required rigidity requirement is increased, and aiming at the working condition at the moment, the second bump foil 2 of the main bearing area adopts a low bump height and small span wave design so as to improve the rigidity of the bearing. In other embodiments, the second bump foil 2 is made of a material with higher rigidity, and thicker bump foil is used, so as to further improve the bearing rigidity.
As shown in fig. 6, a portion of the smooth foil 4 near the fixed end is an inclined portion inclined with respect to the bearing housing 1, an interval between the inclined portion and the bearing housing 1 is gradually increased in a direction away from the fixed end to form an air inlet portion 7 for introducing air, the first wave foil 3 is at least partially positioned between the inclined portion and the bearing housing 1, and a wave height of a portion of the first wave foil 3 positioned between the inclined portion and the bearing housing 1 is gradually changed to abut one end (i.e., a foil top) of the first wave foil 3 away from the bearing housing 1 against the inclined portion.
The wave height of the first bump foil 3 gradually increases with distance from the fixed end of the smooth foil 4 so that the tip of the first bump foil 3 abuts against the inclined portion of the smooth foil 4, and the wavelength of the first bump foil 3 gradually increases with distance from the fixed end of the smooth foil 4 so that a dynamic pressure film can be formed at a low rotation speed of the bearing.
The technical effects of the gas thrust bearing of the embodiment are as follows:
1. the second bump foil 2 with larger wave height is adopted in the main bearing area far away from the fixed end of the smooth foil, so that the problem of failure caused by overlarge deformation of the bump foil is avoided; the first bump foil 3 with lower rigidity is adopted in the non-main bearing area close to the smooth foil, so that a dynamic pressure air film can be smoothly formed when the rotor rotates at a low speed.
2. The wave height of the second bump foil 2 of the main bearing area is lower than that of the first bump foil 3 of the non-main bearing area, and in order to enable the second bump foil 2 of the main bearing area to provide rigidity in time when the rotor runs at a high speed, the bearing housing 1 adopts a stepped design scheme, namely the thickness of the bearing housing 1 in the main bearing area is thicker than that in the non-main bearing area, so that the position of the bump foil of the main bearing area is increased, the bump foil is in contact with the smooth foil 4, and rigidity support is provided in time when the rotor runs at a high speed.
3. Aiming at the main bearing area, the corrugated foil piece with high rigidity is adopted, the risk that the corrugation is flattened to lose efficacy due to uneven bearing of the single corrugated foil piece and overlarge local stress can be reduced, and the reliability of the dynamic pressure gas thrust bearing is improved.
According to another aspect of the utility model, a compressor is also provided, which is characterized by comprising the gas thrust bearing.
According to another aspect of the utility model, an air conditioning system is also provided, which is characterized by comprising the gas thrust bearing.
The present invention is not limited to the above exemplary embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A gas thrust bearing, comprising:
a bearing housing (1);
a smooth foil (4), one end of which along the circumferential direction is a fixed end connected with the bearing shell (1);
a first bump foil (3) provided between the smooth foil (4) and the bearing housing (1); and
second ripples foil (2), with first ripples foil (3) are arranged side by side in proper order along the circumference of gaseous thrust bearing smooth foil (4) with between bearing housing (1), first ripples foil (3) are located being close to of second ripples foil (2) the stiff end one side of smooth foil (4), the rigidity of second ripples foil (2) is greater than the rigidity of first ripples foil (3).
2. The gaseous thrust bearing of claim 1,
the wavelength of the first bump foil (3) is greater than the wavelength of the second bump foil (2); and/or
The wave height of the first bump foil (3) is larger than that of the second bump foil (2); and/or
The rigidity of the material of the second bump foil (2) is larger than that of the material of the first bump foil (3); and/or
The thickness of the first bump foil (3) is smaller than the thickness of the second bump foil (2).
3. Gas thrust bearing according to claim 1, characterized in that the wave height of the first bump foil (3) is greater than the wave height of the second bump foil (2), the bearing housing (1) comprising a first bearing surface bearing the first bump foil (3) and a second bearing surface bearing the second bump foil (2), the second bearing surface having a greater height than the first bearing surface.
4. The gaseous thrust bearing according to claim 1, characterized in that one end of the first bump foil (3) adjacent to the fixed end of the smooth foil (4) is connected to the bearing housing (1) and the other end of the first bump foil (3) abuts the second bump foil (2).
5. Gaseous thrust bearing according to claim 1, characterized in that the end of the smooth foil (4) remote from the fixed end is a free end, the second bump foil (2) extending from the first bump foil (3) to the free end of the smooth foil (4).
6. The gaseous thrust bearing of claim 1, characterized in that a portion of the smooth foil (4) close to the fixed end is an inclined portion inclined with respect to the bearing housing (1), the distance between the inclined portion and the bearing housing (1) gradually increasing in a direction away from the fixed end to form an air intake portion (7) for introducing air, the first bump foil (3) being at least partially located between the inclined portion and the bearing housing (1),
the wave height of the first bump foil (3) gradually increases with the distance from the fixed end of the smooth foil (4), so that one end of the first bump foil (3) far away from the bearing shell (1) is abutted against the inclined part; or
The wavelength of the first bump foil (3) becomes longer gradually as it is farther from the fixed end of the smooth foil (4).
7. The gaseous thrust bearing of claim 1,
the first bump sheet (3) comprises a plurality of first wave structures arranged side by side along the circumferential direction; and/or
The second bump sheet (2) includes a plurality of second wave structures arranged side by side along the circumferential direction.
8. The gaseous thrust bearing of claim 1, comprising a hydrodynamic gaseous thrust bearing.
9. A compressor, characterized by comprising the gas thrust bearing of any one of claims 1 to 8.
10. An air conditioning system, characterized in that it comprises a gas thrust bearing according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122388132.4U CN215762786U (en) | 2021-09-30 | 2021-09-30 | Gas thrust bearing, compressor and air conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122388132.4U CN215762786U (en) | 2021-09-30 | 2021-09-30 | Gas thrust bearing, compressor and air conditioning system |
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| Publication Number | Publication Date |
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| CN215762786U true CN215762786U (en) | 2022-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122388132.4U Active CN215762786U (en) | 2021-09-30 | 2021-09-30 | Gas thrust bearing, compressor and air conditioning system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593138A (en) * | 2022-05-11 | 2022-06-07 | 烟台东德实业有限公司 | Insert-based air bearing |
| CN115076221A (en) * | 2022-07-30 | 2022-09-20 | 广东美的暖通设备有限公司 | Air bearing, rotor assembly, compressor and heating and ventilation equipment |
-
2021
- 2021-09-30 CN CN202122388132.4U patent/CN215762786U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114593138A (en) * | 2022-05-11 | 2022-06-07 | 烟台东德实业有限公司 | Insert-based air bearing |
| CN114593138B (en) * | 2022-05-11 | 2022-09-20 | 烟台东德实业有限公司 | Insert-based air bearing |
| CN115076221A (en) * | 2022-07-30 | 2022-09-20 | 广东美的暖通设备有限公司 | Air bearing, rotor assembly, compressor and heating and ventilation equipment |
| CN115076221B (en) * | 2022-07-30 | 2024-02-23 | 广东美的暖通设备有限公司 | Air bearing, rotor assembly, compressor and heating and ventilation equipment |
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