CN115654021A - Gas dynamic pressure thrust bearing - Google Patents

Abstract

The application discloses an aerodynamic thrust bearing, which includes a bearing base plate, corrugated foils and flat foils stacked layer by layer; the bearing base plate is in the shape of an annular plate, and the corrugated foils and flat foils are all arranged in a ring around the center hole of the bearing base plate , the outer ring boundary of the flat foil exceeds the outer ring boundary of the corrugated foil outwardly, and the inner ring boundary of the flat foil exceeds the inner ring boundary of the corrugated foil inward. The corrugated foil directly supports the flat foil, and the inner and outer edges of the ring of the flat foil extend outward beyond the inner and outer edges of the ring of the corrugated foil, so that the inner and outer edges of the ring of the flat foil are suspended relative to the corrugated foil to form a cantilever structure, which is conducive to improving the deformation characteristics of the inner and outer edges of the flat foil ring, so that the inner and outer edges of the flat foil ring can produce sufficient deformation under specific working conditions, thereby reducing the flat foil ring inner and outer edges The degree of wear and the increase of the air intake between the flat foil and the corrugated foil can improve the convective heat dissipation capacity of the aerodynamic thrust bearing.

Description

A gas dynamic pressure thrust bearing

technical field

The present application relates to the technical field of bearings, in particular to an aerodynamic pressure thrust bearing.

Background technique

Compared with traditional rolling bearings and sliding bearings, gas dynamic pressure bearings can use ambient gas as a lubricating medium, and generate high-pressure gas films on the bearing surface through the dynamic pressure effect to achieve complete suspension of the rotating shaft. Therefore, gas dynamic pressure bearings have high speed and high precision. Excellent performance, high reliability, oil-free lubrication, small friction loss and ability to work in high temperature environments and a series of advantages.

Gas dynamic pressure thrust bearing is a common form of gas dynamic pressure bearing.

The most widely used aerodynamic thrust bearing is the corrugated foil thrust bearing. The corrugated foil thrust bearing is disc-shaped, and the rotating shaft is installed in the disc center hole of the corrugated foil thrust bearing. Affected by the external environment, the air film pressure of the corrugated foil thrust bearing presents a phenomenon that the pressure on the inner and outer edges of the disk is significantly lower than that of other parts, which limits the deformation of the inner and outer edges of the disc of the corrugated foil thrust bearing, resulting in The inner and outer edges of the plate of the corrugated foil thrust bearing are easy to collide and rub with adjacent parts, and the air that does not flow into the outside world enters from the inner and outer edges of the plate of the corrugated foil thrust bearing, resulting in a serious local temperature rise of the corrugated foil thrust bearing, which may further cause Lead to foil outlet coating failure and shaft holding phenomenon.

Contents of the invention

The purpose of this application is to provide a gas dynamic pressure thrust bearing, which can reduce the friction and wear of the foil, increase the air intake of the outside air at the edge of the foil, and avoid serious local temperature rise.

In order to achieve the above purpose, the present application provides a gas dynamic pressure thrust bearing, which includes bearing base plates, corrugated foils and flat foils stacked layer by layer; the bearing base plate is in the shape of an annular plate, and the corrugated foils and flat foils all surround the center of the bearing base plate The holes are distributed in ring columns, the outer ring boundary of the flat foil exceeds the outer ring boundary of the corrugated foil outwardly, and the inner ring boundary of the flat foil exceeds the inner ring boundary of the corrugated foil inward.

In some embodiments, the outer ring edge of the bearing base plate extends outward beyond the outer ring boundary of the flat foil, and the inner ring edge of the bearing base plate extends inward beyond the inner ring boundary of the flat foil.

In some embodiments, the wave foil includes a plurality of fan-shaped wave foils, and all the fan-shaped wave foils are distributed around the central hole of the bearing base plate;

The flat foil includes a plurality of fan-shaped flat foils, and all the fan-shaped flat foils are distributed around the central hole of the bearing bottom plate.

In some embodiments, the axial projection of one sector ring wave foil is within the axial projection of one sector ring flat foil; the axial projection of all sector ring wave foils is within the axial projection of all sector ring flat foils One to one correspondence.

In some embodiments, the two sides of any ring-shaped flat foil are respectively the first flat foil side fixedly connected with the bearing bottom plate and the second flat foil side overlapping the bearing bottom plate.

In some embodiments, the two fan ring sides of any ring-shaped corrugated foil are respectively the first corrugated foil side fixedly connected with the bearing bottom plate and the second corrugated foil side overlapped with the bearing bottom plate; In a pair of fan-ring wave foils and fan-ring flat foils that overlap each other in axial projection, the sides of the first wave foil and the first flat foil are located on different sides, and the sides of the second wave foil and the second wave foil are on the opposite side. The sides of the two flat foils are on opposite sides.

In some embodiments, the bearing bottom plate is provided with a plurality of bottom plate grooves, any bottom plate groove is distributed along the radial direction of the bearing bottom plate, and all the bottom plates are uniformly arranged in a circle along the circumference of the bearing bottom plate; the bearing bottom plate is provided with a plurality of bottom plate gaskets, all The bottom plate gaskets are adjacent to all bottom plate slots in one-to-one correspondence; the number of all bottom plate slots, the number of all fan ring wave foils and all fan ring flat foils are equal, and the number of any fan ring wave foil and any fan ring flat foil The sheets are all located between two adjacent bottom plate grooves.

In some embodiments, the distance between the bearing bottom plate and any circular flat foil gradually increases from the side of the first wave foil to the side of the second wave foil; The direction extending from the side of the corrugated foil to the side of the second corrugated foil is the rotation direction of the gas dynamic pressure thrust bearing.

In some embodiments, any ring wave foil fan is provided with a plurality of foil grooves, any foil groove is arc-shaped and extends along the circumference of the ring wave foil fan, and all the foil grooves are located on the ring wave foil fan. The radial interval distribution; any foil groove is open to the side of the fan ring of the fan ring wave foil;

The same circular wave foil fan is divided into multiple sections by all the foil grooves, and the lengths of each section of the same circular wave foil fan are tapered from the axial middle of the bearing sleeve to the axial two ends.

Compared with the above-mentioned background technology, the aerodynamic thrust bearing provided by this application includes bearing base plates, corrugated foils and flat foils stacked layer by layer; wherein, the bearing base plate is in the shape of an annular plate, and the corrugated foils and flat foils all surround the bearing base plate The center hole ring column distribution; the outer ring boundary of the flat foil exceeds the outer ring boundary of the corrugated foil outwardly, and the inner ring boundary of the flat foil exceeds the inner ring boundary of the corrugated foil inward.

In the aerodynamic thrust bearing, the bearing base plate directly supports the corrugated foil, and the corrugated foil directly supports the flat foil. Since the inner and outer ring boundaries of the flat foil respectively exceed the inner and outer ring boundaries of the corrugated foil, it can be seen that the inner and outer ring boundaries of the flat foil are suspended relative to the corrugated foil, so that the inner and outer ring boundaries of the flat foil form The cantilever structure, therefore, makes the flat foil more susceptible to deformation on both the inner and outer edges of the ring. When the aerodynamic thrust bearing starts, stops or operates under variable loads, the inner and outer edges of the flat foil ring can easily produce sufficient deformation to avoid excessive wear on the inner and outer edges of the flat foil ring and improve the flat foil. The air intake between the foil and the corrugated foil improves the convection cooling effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present application, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is a schematic structural diagram of an aerodynamic thrust bearing provided in an embodiment of the present application;

Fig. 2 is an exploded view of the aerodynamic thrust bearing provided by the embodiment of the present application;

Fig. 3 is a schematic structural view of the bearing bottom plate provided by the embodiment of the present application;

Fig. 4 is a schematic diagram of the assembly of the fan-ring wave foil and the fan-ring flat foil provided by the embodiment of the present application;

Fig. 5 is a schematic diagram of the assembly of the bearing base plate, the fan ring wave foil, the fan ring flat foil and the base plate gasket provided by the embodiment of the present application.

Among them, 1-bearing bottom plate, 11-bottom plate groove, 2-wave foil, 21-fan ring wave foil, 211-first wave foil side, 212-second wave foil side, 213-foil Slot, 3-flat foil, 31-sector annular flat foil, 311-first flat foil side, 312-second flat foil side, 4-bottom plate gasket.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below in conjunction with the drawings and specific embodiments.

Please refer to Figures 1 to 5, Figure 1 is a schematic structural view of the gas dynamic pressure thrust bearing provided by the embodiment of the present application; Figure 2 is an exploded view of the gas dynamic pressure thrust bearing provided by the embodiment of the present application; Schematic diagram of the structure of the bearing bottom plate provided in the embodiment of the application;

Figure 4 is a schematic diagram of the assembly of the fan ring wave foil and the fan ring flat foil provided by the embodiment of the present application; Figure 5 is the bearing base plate, the fan ring wave foil, the fan ring flat foil and the fan ring flat foil provided by the embodiment of the application Schematic diagram of the assembly of the floor spacer.

Please refer to Figure 1 and Figure 2, this application provides a gas dynamic pressure thrust bearing, including a bearing base plate 1, a corrugated foil 2 and a flat foil 3, and the bearing base plate 1, corrugated foil 2 and flat foil 3 are stacked one by one Set and assemble into an annular structure that can be passed through by the rotating shaft. In the gas dynamic pressure thrust bearing, the bearing bottom plate 1 is in the shape of an annular plate, and the corrugated foils 2 and the flat foils 3 are distributed around the center hole of the bearing bottom plate 1; the outer ring boundary of the aforementioned flat foils 3 exceeds the corrugated foil outwards The outer boundary of the sheet 2, the inner boundary of the aforementioned flat foil 3 inwards beyond the inner boundary of the corrugated foil 2.

When assembling the aerodynamic thrust bearing and the rotating shaft, the rotating shaft passes through the central hole of the bearing base plate 1. Therefore, in this embodiment, the corrugated foils 2 and the flat foils 3 are arranged in a ring around the central hole of the bearing base plate 1 to meet the requirements of the rotating shaft. installation requirements.

The corrugated foil 2 is located between the bearing base plate 1 and the flat foil 3 , in other words, the flat foil 3 is supported by the corrugated foil 2 . The outer boundary of the flat foil 3 exceeds the outer boundary of the corrugated foil 2, so that the outer boundary of the flat foil 3 is suspended relative to the corrugated foil 2; the inner boundary of the flat foil 3 exceeds the corrugated foil inward The inner ring boundary of the sheet 2, so that the inner ring boundary of the flat foil sheet 3 is suspended relative to the wave foil sheet 2. It can be seen that the inner and outer edges of the ring of the flat foil sheet 3 form a cantilever structure, which is beneficial to the inner and outer ring of the flat foil sheet 3. The edges on both sides are deformed under specific working conditions, so as to achieve the purpose of reducing the wear of the flat foil 3 . Wherein, the aforementioned specific working conditions generally refer to the start, stop and variable load operation of the aerodynamic thrust bearing.

The aerodynamic pressure thrust bearing provided by the present application will be further described below with reference to the drawings and embodiments.

In some embodiments, referring to FIG. 1 , the axial projection of the corrugated foil 2 and the flat foil 3 are all within the axial projection of the bearing base plate 1 , in other words, the outer ring edge of the bearing base plate 1 faces Beyond the outer ring boundary of the flat foil 3 , the inner ring edge of the bearing bottom plate 1 is inward beyond the inner ring boundary of the flat foil 3 . As can be seen above, the inner and outer edges of the ring of the flat foil 3 are suspended from the corrugated foil 2, therefore, the outer ring edge of the bearing base plate 1 exceeds the outer ring boundary of the corrugated foil 2, and the inner ring edge of the bearing base plate 1 faces beyond the inner ring boundary of the corrugated foil 2. It can be seen that the inner diameter of the bearing base plate 1 is smaller than the inner diameter of the corrugated foil 2 and also smaller than the inner diameter of the flat foil 3; The corrugated foil 2 directly supports the flat foil 3, while the bearing base 1 not only indirectly supports the flat foil 3 through the corrugated foil 2, but also limits the deformation range of the inner and outer edges of the flat foil 3, avoiding the deformation of the flat foil 3. The deformation is too large to affect the normal working characteristics of the flat foil 3 .

Referring to FIGS. 1 to 4, the above-mentioned wave foils 2 may include a plurality of fan-shaped wave foils 2, and all the fan-shaped wave foils 2 are distributed around the central hole of the bearing base plate 1; usually, all the wave foils 2 The inner ring edges of the fan-ring wave foils 2 are in the same circle, and the outer ring edges of all the fan-ring wave foils 2 are in the same circle. Similar to the corrugated foil 2, the flat foil 3 may include a plurality of fan-shaped flat foils 31, and all the fan-shaped flat foils 31 are distributed around the central hole of the bearing base plate 1; usually, all the fan-shaped flat foils 3 The inner ring edges of the flat foils 31 are on the same circumference, and the outer ring edges of all the fan-shaped flat foils 31 of the flat foil 3 are on the same circumference.

The single fan-shaped flat foil 31 of the flat foil 3 is fan-shaped and small in size, which is conducive to the deformation of its inner and outer ring edges under specific working conditions, which in turn is beneficial to reduce wear and increase gas intake by means of the aforementioned deformation To improve convection cooling effect.

On the basis of the above embodiment, all fan-ring wave foils 21 and all fan-ring flat foils 31 are installed in pairs. Obviously, the number of all fan-ring wave foils 21 is the same as the number of all fan-ring flat foils 31 . When a pair of ring sector wave foil 21 and a sector ring flat foil 31 are installed on the bearing base plate 1 , the axial projection of the sector ring wave foil 21 is within the axial projection of the sector ring flat foil 31 .

According to the shape and size relationship between the fan ring wave foil 21 and the fan ring flat foil 31, the axial projection of the fan ring wave foil 21 within the axial projection of the fan ring flat foil 31 may include the following situations:

(1) The central angle of the fan ring wave foil 21 is equal to the center angle of the fan ring flat foil 31. It can be seen that when a pair of fan ring wave foils 21 and a fan ring flat foil 31 are installed on the bearing base plate 1, The two fan ring sides of the fan ring wave foil 21 are respectively aligned with the two fan ring sides of the fan ring flat foil 31; of course, according to the foregoing, the inner and outer sides of the fan ring flat foil 31 respectively exceed the fan ring wave. The inner and outer sides of the ring of foil 21 .

(2) The central angle of the fan ring wave foil 21 is smaller than the center angle of the fan ring flat foil 31. When a pair of fan ring wave foils 21 and a fan ring flat foil 31 are installed on the bearing base plate 1, the fan ring The sides of the two rings of the flat foil 31 can exceed the sides of the two rings of the fan ring wave foil 21. In addition, the fan ring flat foil 31 can have only one side of the fan ring that can exceed the ring wave foil 21 of the fan ring. side of the fan ring.

When a pair of circular sector wave foils 21 and a sectoral flat foil 31 are installed on the bearing base plate 1, the two sector side sides of the sectoral flat foil 31 are the first flat foil side 311 and the second sector side respectively. Two flat foil sides 312 , the aforementioned first flat foil side 311 is fixedly connected to the bearing bottom plate 1 , and the aforementioned second flat foil side 312 overlaps the bearing bottom plate 1 .

When the fan-shaped flat foil 31 is connected to the bearing bottom plate 1 in the above-mentioned installation manner, the fan-ring wave foil 21 can be clamped between the fan-ring wave foil 21 and the bearing bottom plate 1 . In addition, the fan ring wave foil 21 can also be connected to the bearing base plate 1 in a similar installation manner as the fan ring flat foil 31, for example, the two fan ring sides of any fan ring wave foil 21 are respectively the first wave The foil side 211 and the second corrugated foil side 212 , the aforementioned first corrugated foil side 211 is fixedly connected to the bearing base plate 1 , and the aforementioned second corrugated foil side 212 overlaps the bearing base plate 1 . Wherein, in a pair of fan-shaped circular foils 21 and fan-shaped flat foils 31, the first corrugated foil side 211 and the first flat foil side 311 are located on different sides, and the second corrugated foil side 212 and The second flat foil side 312 is on the opposite side.

On the basis of the above-mentioned embodiments, the aerodynamic thrust bearing provided by the present application also includes a plurality of bottom plate gaskets 4, any one of which can be in the shape of a slender strip; the bearing bottom plate 1 is provided with a plurality of bottom plate grooves 11 , any bottom plate groove 11 extends radially along the bearing bottom plate 1, and all bottom plates are evenly arranged in a circle along the circumferential direction of the bearing bottom plate 1; on the bearing base plate 1. In addition, in this aerodynamic thrust bearing, the number of all bottom plate grooves 11, the number of all fan ring wave foils 21 and all fan ring flat foils 31 are equal; any one fan ring wave foil 21 is located on the adjacent bottom plate The grooves 11 are also between the adjacent floor spacers 4 , and any fan-shaped flat foil 31 is not only between the adjacent floor grooves 11 , but also between the adjacent floor spacers 4 .

In some embodiments, the distance between any one fan-shaped flat foil 31 and the bearing base plate 1 gradually increases from the first wave foil side 211 to the second wave foil side 212, so that the fan-shaped flat foil 31 forms a wedge surface, as shown in FIG. 5 . Wherein, the transition direction of any fan-shaped flat foil 31 along its circumferential direction from the first corrugated foil side 211 to the second corrugated foil side 212 is also the rotation direction of the gas dynamic pressure thrust bearing. Therefore, the aforementioned The wedge surface is conducive to the formation of a high-pressure gas film during the operation of the aerodynamic thrust bearing.

Referring to FIG. 4 , in some other embodiments provided by the present application, any one fan ring wave foil 21 is provided with a plurality of foil grooves 213 , and each foil groove 213 is arc-shaped and runs along the fan ring wave foil 21 Extending in the circumferential direction, all foil grooves 213 are distributed at intervals in the radial direction of the fan ring wave foil 21 . Of course, any one of the aforementioned foil grooves 213 is open to at most one of the fan ring sides of the fan ring wave foil 21, for example, the two fan ring sides of the fan ring wave foil 21 include the first wave foil side 211 and the second corrugated foil side 212 , all of the foil grooves 213 may open toward the second corrugated foil side 212 of the fan-ring corrugated foil 21 .

For the same fan ring wave foil 21, it is divided into multiple sections by all the foil grooves 213, for example, one fan ring wave foil 21 includes four foil grooves 213, then one fan ring wave foil 21 is separated by these four foil grooves. The slot 213 is divided into five sections; wherein, the lengths of the segments of the same fan ring wave foil 21 gradually shrink from the axial middle of the bearing sleeve to the axial ends, that is to say, the closer to the fan ring wave foil 21 The inner side of the fan ring and the outer side of the fan ring, the smaller the distance between two adjacent foil grooves 213 is, the larger it is vice versa. The aforementioned segmental characteristics of the fan ring wave foil 21 can greatly reduce the rigidity of the radial ends of the fan ring wave foil 21, so it is beneficial to reduce the deformation difficulty of the fan ring inside and outside of the fan ring wave foil 21, so that the fan ring The inside and outside of the fan ring of the corrugated foil 21 are more likely to be elastically deformed, thereby ensuring that the inside and outside of the fan ring of the fan-shaped flat foil 31 can produce a large enough amount of deformation under specific working conditions.

The aerodynamic pressure thrust bearing provided by the present application has been introduced in detail above. In this paper, specific examples are used to illustrate the principles and implementation methods of the present application, and the descriptions of the above embodiments are only used to help understand the methods and core ideas of the present application. It should be pointed out that those skilled in the art can make some improvements and modifications to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims (9)

1. A gas dynamic pressure thrust bearing is characterized by comprising a bearing bottom plate (1), a wave foil (2) and a flat foil (3) which are arranged in a stacking mode; the bearing bottom plate (1) is in an annular plate shape, the wave foil (2) and the flat foil (3) are distributed in an annular array mode around a center hole of the bearing bottom plate (1), the outer ring boundary of the flat foil (3) outwards exceeds the outer ring boundary of the wave foil (2), and the inner ring boundary of the flat foil (3) inwards exceeds the inner ring boundary of the wave foil (2).

2. Aerodynamic thrust bearing according to claim 1, characterized in that the outer circumferential edge of the bearing bottom plate (1) extends outwardly beyond the outer circumferential boundary of the flat foil (3) and the inner circumferential edge of the bearing bottom plate (1) extends inwardly beyond the inner circumferential boundary of the flat foil (3).

3. A gas dynamic pressure thrust bearing according to claim 1,

the bump foil (2) comprises a plurality of fan-shaped ring-shaped bump foils (21), and all the fan-shaped ring-shaped bump foils (21) are distributed around the central hole of the bearing bottom plate (1) in an annular array;

the flat foil (3) comprises a plurality of fan-shaped annular flat foils (31), and all the fan-shaped annular flat foils (31) are distributed around the central hole of the bearing base plate (1) in an annular array.

4. Aerodynamic thrust bearing according to claim 3, characterized in that the axial projection of one of said fan-shaped corrugated foils (21) lies within the axial projection of one of said fan-shaped flat foils (31); the axial projections of all the fan-shaped annular wave foils (21) correspond to the axial projections of all the fan-shaped annular flat foils (31) one by one.

5. The aerodynamic thrust bearing according to claim 3, wherein the two fan ring sides of any one of the fan ring shaped flat foils (31) are a first flat foil side (311) fixedly connected to the bearing bottom plate (1) and a second flat foil side (312) overlapping the bearing bottom plate (1), respectively.

6. The aerodynamic thrust bearing according to claim 5, wherein the two fan ring sides of any one of the fan ring-shaped bump foils (21) are a first bump foil side (211) fixedly connected with the bearing bottom plate (1) and a second bump foil side (212) overlapped with the bearing bottom plate (1); in a pair of the fan-shaped annular corrugated foil (21) and the fan-shaped annular flat foil (31) which are overlapped in axial projection, the first corrugated foil side (211) and the first flat foil side (311) are located on the opposite side, and the second corrugated foil side (212) and the second flat foil side (312) are located on the opposite side.

7. The aerodynamic thrust bearing according to claim 6, characterized in that the bearing bottom plate (1) is provided with a plurality of bottom plate grooves (11), any one of the bottom plate grooves (11) is distributed along the radial direction of the bearing bottom plate (1), and all the bottom plates (11) are uniformly arranged in a circular manner along the circumferential direction of the bearing bottom plate (1); the bearing bottom plate (1) is provided with a plurality of bottom plate gaskets (4), and all the bottom plate gaskets (4) are close to all the bottom plate grooves (11) in a one-to-one correspondence manner; the number of all the bottom plate grooves (11), the number of all the fan-shaped annular wave foil pieces (21) and the number of all the fan-shaped annular flat foil pieces (31) are equal, and any one of the fan-shaped annular wave foil pieces (21) and any one of the fan-shaped annular flat foil pieces (31) are located between every two adjacent bottom plate grooves (11).

8. The aerodynamic thrust bearing according to any one of claims 4 to 7, wherein a distance between the bearing bottom plate (1) and any one of the fan-shaped flat foils (31) is gradually raised from the first bump foil side (211) toward the second bump foil side (212); in the same flat foil (3), a direction extending from the first bump foil side (211) to the second bump foil side (212) is a rotation direction of the aerodynamic thrust bearing.

9. The gas dynamic pressure thrust bearing according to any one of claims 4 to 7, wherein any one of the fan-shaped bump foils (21) is provided with a plurality of foil grooves (213), any one of the foil grooves (213) is arc-shaped and extends along a circumferential direction of the fan-shaped bump foil (21), and all the foil grooves (213) are spaced apart in a radial direction of the fan-shaped bump foil (21); any one of the foil slots (213) is open to the fan ring side of the fan ring wave foil (21); the same fan-shaped annular wave foil (21) is divided into a plurality of sections by all the foil grooves (213), and the length of each section of the same fan-shaped annular wave foil (21) is gradually reduced from the axial middle part to the axial two ends of the bearing sleeve (1).

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