Air foil thrust bearing and compressor

Abstract

The invention discloses an air foil thrust bearing and a compressor, and relates to the technical field of bearings, the air foil thrust bearing comprises a bottom plate, a bump foil, a gasket and a top foil, the bump foil and the gasket are located between the bottom plate and the top foil, the gasket is located on the side, facing the top foil, of the bump foil, and the top foil is located between the bump foil and the gasket. At least one first vent hole penetrating through the bottom plate is formed in the bottom plate. According to the air foil thrust bearing disclosed by the embodiment of the invention, cooling gas can enter the air foil thrust bearing through the first vent holes, and the cooling gas can cool the bump foil and the top foil in the air foil thrust bearing, so that the heat dissipation capability of the air foil thrust bearing is improved, the heat dissipation capability of the air foil thrust bearing is good, and the service life of the air foil thrust bearing is prolonged. The probability of wear failure of the air foil thrust bearing caused by too high temperature can be reduced, and the service life of the air foil thrust bearing can be prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, and in particular to an air foil thrust bearing and a compressor having the air foil thrust bearing. Background Art

[0002] In the related art, the existing air foil thrust bearing generates a lot of heat when the compressor is under high axial load conditions. The heat cannot be dissipated in time, which easily leads to bearing wear and failure. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide an air foil thrust bearing, which has good heat dissipation capacity, can reduce the probability of the air foil thrust bearing being worn out due to excessive temperature, and is conducive to extending the service life of the air foil thrust bearing.

[0004] The present invention also provides a compressor using the air foil thrust bearing.

[0005] According to an embodiment of the first aspect of the present invention, an air foil thrust bearing comprises: a bottom plate, a bump foil, a gasket and a top foil, wherein the bump foil and the gasket are located between the bottom plate and the top foil, and the gasket is located on the side of the bump foil facing the top foil, wherein the bottom plate is formed with at least one first air vent hole penetrating the bottom plate.

[0006] According to the air foil thrust bearing of the embodiment of the present application, cooling gas can enter the air foil thrust bearing through the first air vent, and the cooling gas can cool the corrugated foil and the top foil inside the air foil thrust bearing, which is beneficial to improving the heat dissipation capacity of the air foil thrust bearing. The air foil thrust bearing has good heat dissipation capacity, which can reduce the probability of the air foil thrust bearing failing due to wear due to excessive temperature, and is beneficial to extending the service life of the air foil thrust bearing.

[0007] According to some embodiments of the present invention, the first ventilation hole extends in a radial direction of the bottom plate.

[0008] According to some embodiments of the present invention, the top foil is formed with second ventilation holes, and along the arrangement direction of the bottom plate and the top foil, at least a portion of the second ventilation holes is staggered with the gasket.

[0009] According to some embodiments of the present invention, there are a plurality of second ventilation holes, and the plurality of second ventilation holes are arranged sequentially along the radial direction of the top foil.

[0010] According to some embodiments of the present invention, the second ventilation holes are strip-shaped holes, and the second ventilation holes extend along the circumference of the top foil.

[0011] According to some embodiments of the present invention, along the circumference of the top foil, a plurality of ventilation gaps are formed on at least one side edge of the top foil, and the plurality of ventilation gaps are arranged in sequence along the edge of the top foil, and along the arrangement direction of the bottom plate and the top foil, the ventilation gaps are correspondingly arranged to the corresponding first ventilation holes.

[0012] According to some embodiments of the present invention, the bump foil is formed with a third vent hole penetrating the bump foil.

[0013] According to some embodiments of the present invention, the third ventilation hole extends along the circumference of the bump foil.

[0014] According to some embodiments of the present invention, there are a plurality of the third ventilation holes, and the plurality of the third ventilation holes are arranged sequentially along the radial direction of the corrugated foil.

[0015] The compressor according to the second embodiment of the present invention comprises the air foil thrust bearing described in the above embodiment.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic diagram of an air foil thrust bearing according to an embodiment of the present application;

[0019] Figure 2 is an exploded view of an air foil thrust bearing according to an embodiment of the present application;

[0020] Figure 3 is a schematic diagram of a base plate according to an embodiment of the present application;

[0021] Figure 4 is a schematic diagram of a top foil according to an embodiment of the present application;

[0022] Figure 5 Schematic diagram of a corrugated foil according to an embodiment of the present application.

[0023] Reference numerals:

[0024] Air foil thrust bearing 1,

[0025] Bottom plate 10, first vent hole 11, center hole 12, connecting portion 13, notch 131,

[0026] The corrugated foil 20, the third vent hole 21,

[0027] Gasket 30,

[0028] Top foil 40 , second ventilation holes 41 , ventilation gaps 42 . DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] Reference below Figure 1-Figure 5 An air foil thrust bearing 1 according to an embodiment of the present invention is described. The air foil thrust bearing 1 can be installed in a compressor, but the present invention is not limited to this. The air foil thrust bearing 1 can also be applied to other mechanical devices, such as gas turbines, centrifugal pumps, turbines, etc. This application takes the application of the air foil thrust bearing 1 in a compressor as an example for explanation.

[0031] According to the air foil thrust bearing 1 of the first embodiment of the present invention, Figure 1-Figure 5 As shown, the air foil thrust bearing 1 may include: a bottom plate 10, a bump foil 20, a gasket 30 and a top foil 40, wherein the bump foil 20 and the gasket 30 are located between the bottom plate 10 and the top foil 40, and the gasket 30 is located on the side of the bump foil 20 facing the top foil 40, wherein the bottom plate 10 is formed with at least one first vent hole 11 penetrating the bottom plate 10.

[0032] It should be noted that in the related art, the existing air foil thrust bearing generates a lot of heat under the high axial load condition of the compressor, and the heat cannot be dissipated in time, which easily leads to bearing wear and failure.

[0033] Based on this, the embodiment of the present application proposes an air foil thrust bearing 1, wherein a bottom plate 10, a bump foil 20, a gasket 30 and a top foil 40 are stacked, the bump foil 20 and the gasket 30 can be located between the bottom plate 10 and the top foil 40, the bump foil 20 is connected to the bottom plate 10, and the gasket 30 is located on the side of the bump foil 20 facing the top foil 40. The bottom plate 10, the bump foil 20, the gasket 30 and the top foil 40 can be arranged in sequence along a first direction. When the air foil thrust bearing 1 is placed in an up-and-down direction, the first direction can be the height direction of the air foil thrust bearing 1. The embodiment of the present application takes the air foil thrust bearing 1 placed in an up-and-down direction as an example for explanation, and the bottom plate 10 can be located below the top foil 40. The bottom plate 10 and the gasket 30 can both be made of stainless steel, the bump foil 20 and the top foil 40 can both be made of materials such as aluminum foil, the bottom plate 10 can be welded to the bump foil 20, the bump foil 20 can be welded to the gasket 30, the gasket 30 can be welded to the top foil 40, and the bottom plate 10, the bump foil 20, the gasket 30 and the top foil 40 can be connected in sequence along the first direction. The bump foil 20 and the top foil 40 are connected through the gasket 30, and along the first direction, at least part of the bump foil 20 can be spaced apart from the top foil 40, and there is a gap between the bump foil 20 and the top foil 40. As an example, the gasket 30 can be connected to one end of the bump foil 20 along the circumference of the bump foil 20, the gasket 30 can be connected to one end of the top foil 40 along the circumference of the top foil 40, and the other end of the bump foil 20 along the circumference of the bump foil 20 is arranged opposite to and spaced apart from the other end of the top foil 40 along the circumference of the top foil 40 along the first direction, and there is a gap between the bump foil 20 and the top foil 40.

[0034] The bottom plate 10 is formed with a central hole 12, which can be arranged at the center of the bottom plate 10, and the central hole 12 can penetrate the bottom plate 10 along the thickness direction (i.e., the first direction) of the bottom plate 10. The bottom plate 10 can be constructed as an annular structure, and the central hole 12 can be used for assembly with other structures of the compressor. There can be multiple bump foils 20, and the cross section of the bump foil 20 can be constructed as a fan ring. Multiple bump foils 20 can be arranged around the central hole 12, and multiple bump foils 20 can be arranged along the circumference of the bottom plate 10. There can be multiple top foils 40, and the cross section of the top foil 40 can be constructed as a fan ring. Multiple top foils 40 can be arranged around the central hole 12, and multiple top foils 40 can be arranged along the circumference of the bottom plate 10. Multiple bump foils 20 can be arranged one-to-one with multiple top foils 40 along the first direction, and each bump foil 20 has a top foil 40 arranged correspondingly thereto. There may be a plurality of gaskets 30 , and the plurality of gaskets 30 may be arranged in one-to-one correspondence with the plurality of bump foils 20 , and a gasket 30 is connected between each bump foil 20 and each top foil 40 .

[0035] The bottom plate 10 is formed with at least one first vent hole 11, and the first vent hole 11 can penetrate the bottom plate 10 along the thickness direction of the bottom plate 10. The cooling gas can enter the air foil thrust bearing 1 from the bottom of the bottom plate 10. The cooling air can enter the inside of the air foil thrust bearing 1 through the first vent hole 11. The cooling gas can be a low-temperature gas. The cooling gas can be mixed with the high-temperature gas inside the air foil thrust bearing 1, thereby playing a role in cooling the top foil 40. Since a gasket 30 is connected between each bump foil 20 and the top foil 40, at least part of the bump foil 20 can be spaced apart from the top foil 40, and there is a gap between the bump foil 20 and the top foil 40. The mixed gas can enter between the bump foil 20 and the top foil 40, and the mixed gas can cool the bump foil 20.

[0036] There can be multiple first vent holes 11, and the number of the first vent holes 11 can be set according to the number of the bump foils 20, and the number of the first vent holes 11 can be the same as the number of the bump foils 20. As an example, the number of the bump foils 20 can be two, three, four, six, etc., and the number of the first vent holes 11 can be two, three, four, six, etc. The embodiment of the present application is described by taking six bump foils 20 and six first vent holes 11 as an example. Multiple first vent holes 11 are evenly arranged along the circumference of the bottom plate 10, and a bump foil 20 is provided between any two adjacent first vent holes 11, and the cross-sectional size and cross-sectional shape of the bump foil 20 can be adapted to the cross-sectional size and cross-sectional shape of the bottom plate 10 between the two adjacent first vent holes 11. The cooling gas can enter the air foil thrust bearing 1 through the first air vent 11, and the cooling gas can cool the wave foil 20 and the top foil 40 inside the air foil thrust bearing 1, which is beneficial to improving the heat dissipation capacity of the air foil thrust bearing 1. The air foil thrust bearing 1 has good heat dissipation capacity, which can reduce the probability of the air foil thrust bearing 1 failing due to wear due to excessive temperature, and is beneficial to extending the service life of the air foil thrust bearing 1.

[0037] As an example, in the air foil thrust bearing 1, the pressure at the center hole 12 can be lower than the pressure at the first vent hole 11. When the cooling gas enters the interior of the air foil thrust bearing 1 through the first vent hole 11, the cooling gas cools the wave foil 20 and the top foil 40 inside the air foil thrust bearing 1, and then can be discharged from the air foil thrust bearing 1 from the center hole 12, thereby realizing the flow of gas.

[0038] In some embodiments of the present invention, a plurality of connection parts 13 may be provided on the outer peripheral wall of the bottom plate 10, and the plurality of connection parts 13 may be evenly arranged along the circumference of the bottom plate 10, and the air foil thrust bearing 1 may be fixed on the compressor through the plurality of connection parts 13. As an example, the connection part 13 may include a notch 131, and the notch 131 may be assembled with a positioning pin, and the positioning pin may be limitedly abutted with the inner wall of the notch 131, and by arranging a plurality of connection parts 13 and assembling with a plurality of positioning pins, each connection part 13 has a positioning pin corresponding thereto, thereby limiting the movement of the air foil thrust bearing 1, and thus achieving the effect of fixing the air foil thrust bearing 1.

[0039] In some embodiments of the present invention, Figure 3 As shown, the first ventilation hole 11 extends in the radial direction of the bottom plate 10 .

[0040] Along the radial direction of the bottom plate 10, the first vent hole 11 can extend from the central hole 12 to the edge of the bottom plate 10, so as to increase the flow of cooling gas entering the air foil thrust bearing 1, which is beneficial to improving the heat dissipation effect of the air foil thrust bearing 1. The first vent hole 11 can be adapted to the circumferential edge shape of the bump foil 20, and the first vent hole 11 can be constructed as a long strip hole. A bump foil 20 and a top foil 40 can be provided between any two adjacent first vent holes 11. After the cooling gas enters the air foil thrust bearing 1, it can effectively flow to the top foil 40 adjacent to the first vent hole 11, which is beneficial to improving the cooling efficiency of the air foil thrust bearing 1.

[0041] In some embodiments of the present invention, Figure 1 and Figure 2 As shown, the top foil 40 is formed with second ventilation holes 41 , and along the arrangement direction of the bottom plate 10 and the top foil 40 , at least a portion of the second ventilation holes 41 is staggered with the gasket 30 .

[0042] The top foil 40 is formed with a second air vent 41. Along the arrangement direction of the bottom plate 10 and the top foil 40 (i.e., the first direction), the second air vent 41 can be arranged corresponding to the gasket 30. At least part of the second air vent 41 can be staggered with the corresponding gasket 30. The second air vent 41 can be connected to the gap between the corresponding bump foil 20 and the corresponding top foil 40, so that the mixed gas can enter the gap between the corresponding bump foil 20 and the corresponding top foil 40 through the second air vent 41. The gas can cool the corresponding bump foil 20, thereby reducing the temperature of the corresponding bump foil 20, which is beneficial to further enhance the heat dissipation effect of the air foil thrust bearing 1.

[0043] In some embodiments of the present invention, Figure 2 and Figure 4 As shown, there are a plurality of second ventilation holes 41 , and the plurality of second ventilation holes 41 are sequentially arranged along the radial direction of the top foil 40 .

[0044] There may be a plurality of second vent holes 41, which are sequentially arranged along the radial direction of the top foil 40, and at least a portion of the plurality of second vent holes 41 may be staggered with the corresponding gasket 30. By providing a plurality of second vent holes 41, the flow rate of the gas entering the gap between the corresponding bump foil 20 and the corresponding top foil 40 may be increased, which is beneficial to improving the cooling efficiency of the corresponding bump foil 20. Moreover, the plurality of second vent holes 41 are sequentially arranged along the radial direction of the top foil 40, so that the gas can be evenly distributed in the gap between the corresponding bump foil 20 and the corresponding top foil 40, which is beneficial to increasing the contact area between the gas and the corresponding bump foil 20, thereby improving the heat exchange efficiency between the gas and the corresponding bump foil 20, and improving the efficiency of cooling the corresponding bump foil 20.

[0045] In some embodiments of the present invention, Figure 2 and Figure 4 As shown, the second ventilation holes 41 are strip-shaped holes, and the second ventilation holes 41 extend along the circumference of the top foil 40 .

[0046] The second vent holes 41 are configured as strip holes, so that at least a portion of the second vent holes 41 is staggered with the corresponding gasket 30, thereby reducing the probability that the corresponding gasket 30 closes the entire second vent holes 41, and reducing the probability that the cooling gas cannot enter the gap between the corresponding bump foil 20 and the corresponding top foil 40. A plurality of second vent holes 41 are sequentially arranged along the radial direction of the top foil 40, and the second vent holes 41 can extend along the circumferential direction of the top foil 40, so that the area of ​​the staggered portion of the second vent holes 41 and the corresponding gasket 30 can be increased, which is conducive to increasing the flow rate of the gas entering the gap between the corresponding bump foil 20 and the corresponding top foil 40, thereby improving the cooling efficiency of the corresponding bump foil 20 and improving the heat dissipation efficiency of the air foil thrust bearing 1.

[0047] As an example, along the circumference of the top foil 40, the length dimension of the second vent hole 41 can be greater than the width dimension of the corresponding gasket 30, and the end of the second vent hole 41 away from the gap between the corresponding corrugated foil 20 and the corresponding top foil 40 can be aligned with the edge of the gasket 30, which can play a positioning role and facilitate the welding connection of the corresponding top foil 40 and the corresponding gasket 30.

[0048] In some embodiments of the present invention, along the circumference of the top foil 40, a plurality of ventilation gaps 42 are formed on at least one side edge of the top foil 40, and the plurality of ventilation gaps 42 are arranged in sequence along the edge of the top foil 40, and along the arrangement direction of the bottom plate 10 and the top foil 40, the ventilation gaps 42 are correspondingly arranged to the corresponding first ventilation holes 11.

[0049] Along the circumference of the top foil 40, at least one side edge of the top foil 40 is formed with a plurality of ventilation gaps 42, one side edge of the top foil 40 may be formed with a plurality of ventilation gaps 42, or both side edges of the top foil 40 are formed with ventilation gaps 42. The embodiment of the present application is described by taking the one side edge of the top foil 40 as an example in which a plurality of ventilation gaps 42 are formed. One side edge of the top foil 40 may be formed with a plurality of ventilation gaps 42, the plurality of ventilation gaps 42 may be arranged along the radial direction of the top foil 40, and the plurality of ventilation gaps 42 may be connected in sequence. The plurality of ventilation gaps 42 may be spaced apart from the plurality of second ventilation holes 41 along the circumference of the top foil 40, the ventilation gaps 42 are arranged at one end of the top foil 40 along the circumference of the top foil 40, and the second ventilation holes 41 are arranged near the other end of the top foil 40 along the circumference of the top foil 40. Along the arrangement direction of the bottom plate 10 and the top foil 40, the ventilation gaps 42 can be set corresponding to the corresponding first ventilation holes 11, and multiple ventilation gaps 42 can correspond to at least part of the first ventilation holes 11, so that the cooling gas entering the air foil thrust bearing 1 through the first ventilation holes 11 can generate turbulence, which is beneficial to increase the flow rate of the cooling gas, so that the cooling gas can be better mixed with the high-temperature gas inside the air foil thrust bearing 1, thereby increasing the heat exchange efficiency between the cooling gas and the high-temperature gas inside the air foil thrust bearing 1, and is beneficial to improving the cooling effect on the top foil 40.

[0050] In some embodiments of the present invention, the bump foil 20 is formed with a third vent hole 21 penetrating through the bump foil 20 .

[0051] The third vent holes 21 may penetrate the bump foil 20 along the thickness direction of the bump foil 20 . By providing the third vent holes 21 , the contact area between the gas and the bump foil 20 may be increased, which is beneficial to improving the cooling efficiency of the bump foil 20 .

[0052] In some embodiments of the present invention, Figure 5 As shown, the third ventilation holes 21 extend along the circumferential direction of the bump foil 20 .

[0053] The third air hole 21 can extend along the circumference of the bump foil 20. Along the circumference of the bump foil 20, the third air hole 21 can extend to the edge of the bump foil 20 at one end away from the gasket 30. The third air hole 21 can play a role in guiding flow, reducing the resistance to gas flow, so that the gas can flow along the circumference of the bump foil 20. The gas can flow from one end of the bump foil 20 to the other end along the circumference of the bump foil 20, which can enhance the cooling effect on the bump foil 20 and effectively reduce the temperature of the bump foil 20.

[0054] In some embodiments of the present invention, there are a plurality of third ventilation holes 21 , and the plurality of third ventilation holes 21 are sequentially arranged along the radial direction of the bump foil 20 .

[0055] There can be multiple third air holes 21, and the third air holes 21 can be two, three, four or the like. The multiple third air holes 21 can all extend along the circumference of the bump foil 20, and the multiple third air holes 21 are arranged in sequence along the radial direction of the bump foil 20, thereby increasing the contact area between the gas and the bump foil 20, achieving comprehensive cooling of the bump foil 20, further improving the cooling efficiency of the bump foil 20, and improving the cooling effect of the bump foil 20.

[0056] The compressor according to the second embodiment of the present invention comprises the air foil thrust bearing 1 in the above embodiment.

[0057] According to the compressor of the embodiment of the present application, the air foil thrust bearing 1 in the above embodiment is used to improve the heat dissipation performance of the air foil thrust bearing 1, reduce the temperature of the air foil thrust bearing 1, and improve the safety of the compressor operation.

[0058] Other structures and operations of the air foil thrust bearing 1 and the compressor according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air foil thrust bearing, characterized in that: include: A bottom plate (10), a bump foil (20), a gasket (30) and a top foil (40), wherein the bump foil (20) and the gasket (30) are located between the bottom plate (10) and the top foil (40), and the gasket (30) is located on a side of the bump foil (20) facing the top foil (40), wherein the bottom plate (10) is formed with at least one first ventilation hole (11) penetrating the bottom plate (10).

2. The air foil thrust bearing according to claim 1, characterized in that: The first ventilation hole (11) extends in the radial direction of the bottom plate (10).

3. The air foil thrust bearing according to claim 1, characterized in that: The top foil (40) is formed with a second ventilation hole (41), and along the arrangement direction of the bottom plate (10) and the top foil (40), at least a portion of the second ventilation hole (41) is staggered with the gasket (30).

4. The air foil thrust bearing according to claim 3, characterized in that: There are a plurality of the second ventilation holes (41), and the plurality of the second ventilation holes (41) are arranged in sequence along the radial direction of the top foil (40).

5. The air foil thrust bearing according to claim 4, characterized in that: The second ventilation holes (41) are strip-shaped holes, and the second ventilation holes (41) extend along the circumferential direction of the top foil (40).

6. The air foil thrust bearing according to claim 1, characterized in that: Along the circumference of the top foil (40), at least one side edge of the top foil (40) is formed with a plurality of ventilation notches (42), the plurality of ventilation notches (42) are arranged in sequence along the edge of the top foil (40), and along the arrangement direction of the bottom plate (10) and the top foil (40), the ventilation notches (42) are arranged correspondingly to the corresponding first ventilation holes (11).

7. The air foil thrust bearing according to any one of claims 1 to 6, characterized in that: The bump foil (20) is formed with a third vent hole (21) penetrating the bump foil (20).

8. The air foil thrust bearing according to claim 7, characterized in that: The third ventilation hole (21) extends along the circumferential direction of the corrugated foil (20).

9. The air foil thrust bearing according to claim 7, characterized in that: There are a plurality of third ventilation holes (21), and the plurality of third ventilation holes (21) are arranged in sequence along the radial direction of the corrugated foil (20).

10. A compressor, characterized in that: It comprises an air foil thrust bearing (1) according to any one of claims 1-9.

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