A compressor and its thrust bearing device

Abstract

The present application discloses a compressor and its thrust bearing device. The thrust bearing device includes a bearing body, and at least two elastic support structures are arranged on the bearing body along the circumferential direction of the bearing body. It should be noted that the stiffnesses of the at least two elastic support structures are different, and the dimensions of the at least two elastic support structures along the axial direction of the bearing body are also different. For the above-mentioned thrust bearing device, supports with different stiffnesses can be provided according to different loads. In this way, excessive wear on the bearing surface can be avoided, and at the same time, the thrust requirements under changes in compression ratio or pressure difference can be met, thereby solving the problems of high stiffness and high wear and improving the service life of the thrust bearing device.

Description

Technical Field

[0001] The present application relates to the technical field of compression equipment, and particularly relates to a thrust bearing device. The present application also relates to a compressor having the thrust bearing device. Background Art

[0002] Currently, there are mainly two ways for the thrust bearings of aerostatic centrifugal compressors. One is hydrostatic gas support, which is achieved by adjusting the supply of gas. The other is high-elasticity wave foil support. Among them, the use of hydrostatic gas support requires continuous gas supply from the outside, which is energy-consuming and has poor economy. The use of wave foil support structure requires high-elasticity foil. However, under common working conditions, due to the complex forces on the compressor during startup, shutdown and operation, it is easy to cause excessive friction on the bearing surface. The stiffness of the usual wave foil support structure is constant and cannot be actively adjusted. In order to meet the thrust requirements at the highest pressure ratio or pressure difference, it brings problems such as relatively large friction or relatively large proportion of friction loss at lower pressure ratios or pressure differences. Therefore, in order to meet the thrust requirements under variable pressure ratios or pressure differences, it is necessary for those skilled in the art to timely provide a thrust bearing device with adjustable stiffness. Summary of the Invention

[0003] The purpose of the present application is to provide a thrust bearing device that can provide supports with different stiffness according to different loads, thereby solving the wear problem and improving the service life. Another purpose of the present application is to provide a compressor including the above-mentioned thrust bearing device.

[0004] To achieve the above purpose, the present application provides a thrust bearing device, including a bearing body and at least two elastic support structures arranged along the circumferential direction of the bearing body. The stiffness of the at least two elastic support structures is different, and the dimensions of the at least two elastic support structures along the axial direction of the bearing body are different.

[0005] In some embodiments, any one of the elastic support structures includes a first foil, a second foil and an elastic member. The elastic member is arranged between the first foil and the second foil, and the elastic member is used to provide an elastic force along the axial direction of the bearing body, so that the first foil or the second foil has a tendency to move away from the bearing body.

[0006] In some embodiments, the elastic member is in a corrugated shape or a spring structure, and the first foil and the second foil respectively abut against both sides of the elastic member along the axial direction of the bearing body.

[0007] In some embodiments, the second foil is arranged between the elastic member and the bearing body, and the second foils are integrally connected and arranged on the bearing body.

[0008] In some embodiments, the shape of the second foils after being integrally connected is adapted to the shape of the bearing body.

[0009] In some embodiments, a plurality of sets of elastic support structures are provided, and each set of elastic support structures is distributed along the circumferential direction of the bearing body, and the types of any two adjacent sets of elastic support structures are different.

[0010] In some embodiments, any one set of elastic support structures includes at least two elastic support structures of the same type.

[0011] In some embodiments, there are two types of elastic support structures. The size of the first type of elastic support structure in the axial direction is greater than that of the second type of elastic support structure in the axial direction, and the stiffness of the first type of elastic support structure is less than that of the second type of elastic support structure.

[0012] In some embodiments, each elastic support structure is evenly distributed along the circumferential direction of the bearing body.

[0013] The present application also provides a compressor, including:

[0014] A housing;

[0015] A rotor rotatably disposed in the housing;

[0016] A thrust disk sleeved on the rotor and rotating with the rotor;

[0017] A thrust bearing device as described in any one of the above, the thrust bearing device is disposed in the housing, and a gap is formed between each elastic support structure of the thrust bearing device and the thrust disk.

[0018] Compared with the above background art, the thrust bearing device provided by the embodiments of the present application includes a bearing body, and at least two types of elastic support structures are provided on the bearing body along the circumferential direction of the bearing body. It should be noted that the stiffnesses of the at least two types of elastic support structures are different, and the sizes of the at least two types of elastic support structures in the axial direction of the bearing body are also different. That is to say, the thrust bearing device provided by the embodiments of the present application is provided with at least two types of elastic support structures with different stiffnesses and heights on the bearing body. Among them, when the thrust bearing device is applied to a compressor, the elastic support structures with different stiffnesses are used to cope with different thrusts.

[0019] Compared with the traditional thrust bearing device with non-adjustable stiffness, such as the usual wave foil support structure with constant stiffness, which cannot be actively adjusted and can only meet the thrust requirements under the highest pressure ratio or pressure difference, and cannot meet the thrust demand under the change of pressure ratio or pressure difference. The thrust bearing device provided by the embodiment of the present application can provide supports with different stiffness according to different loads. In this way, when the thrust bearing device is applied to a compressor and in a normal working condition, the elastic support structure with higher stiffness can be used to correspond to the thrust. When the thrust bearing device is applied to a compressor and in a start-stop working condition, the elastic support structure with lower stiffness can be used to correspond to the thrust. Compared with using an elastic support structure with consistent stiffness to cope, using the elastic support structure with lower stiffness to correspond to the thrust when the compressor is in the start-stop working condition can avoid excessive wear on the bearing surface, and at the same time can meet the thrust demand under the change of pressure ratio or pressure difference, thus solving the problem of high stiffness and high wear and improving the service life of the thrust bearing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the first thrust bearing device in the embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of the overall structure of the second thrust bearing device in the embodiment of the present application;

[0023] Figure 3 is Figure 1 A schematic diagram of a distribution method of the elastic support structure in the shown thrust bearing device;

[0024] Figure 4 is Figure 1 A schematic diagram of another distribution method of the elastic support structure in the shown thrust bearing device;

[0025] Figure 5 is Figure 3 A schematic diagram of the assembly of different elastic support structures under the shown distribution method;

[0026] Figure 6 is Figure 2 A schematic diagram of the distribution of the elastic support structure in the shown thrust bearing device.

[0027] Wherein:

[0028] 10 - Thrust bearing device,

[0029] 11 - Bearing body,

[0030] 12 - Elastic support structure, 121 - First foil, 122 - Second foil, 123 - Elastic member. Specific embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts belong to the scope of protection of the present application.

[0032] In order to enable those skilled in the art of this technology to better understand the solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] It should be noted that the orientation words such as "upper end, lower end, left side, right side" described below are defined based on the accompanying drawings of the specification.

[0034] Please refer to Figures 1 to 6 , Figure 1 , which is a schematic diagram of the overall structure of the first thrust bearing device in the embodiment of the present application; Figure 2 , which is a schematic diagram of the overall structure of the second thrust bearing device in the embodiment of the present application; Figure 3 is Figure 1 a schematic diagram of a distribution method of the elastic support structure in the thrust bearing device shown; Figure 4 is Figure 1 a schematic diagram of another distribution method of the elastic support structure in the thrust bearing device shown; Figure 5 is Figure 3 an assembly schematic diagram of different elastic support structures under this distribution method shown; Figure 6 is Figure 2 a distribution schematic diagram of the elastic support structure in the thrust bearing device shown.

[0035] The thrust bearing device 10 provided in the embodiment of the present application includes a bearing body 11. The bearing body 11 is generally a bearing body 11 with a circular ring structure. At least two elastic support structures 12 are provided on the bearing body 11 along the circumferential direction of the bearing body 11. It should be noted that the stiffnesses of at least two elastic support structures 12 are different, and the dimensions of at least two elastic support structures 12 along the axis direction of the bearing body 11 are also different.

[0036] That is to say, the thrust bearing device 10 provided by the embodiments of the present application is provided with at least two elastic support structures 12 having different stiffnesses and heights on the bearing body 11. Among them, when the thrust bearing device 10 is applied to a compressor, the elastic support structures 12 with different stiffnesses are used to cope with different thrusts, and this thrust is generally the thrust along the axis direction of the bearing body 11.

[0037] Compared with the traditional thrust bearing device 10 with non-adjustable stiffness, such as the usual wave foil support structure, its stiffness is constant and cannot be actively adjusted, and it can only meet the thrust requirements under the highest pressure ratio or pressure difference, and cannot meet the thrust requirements under the change of pressure ratio or pressure difference. However, the thrust bearing device 10 provided by the embodiments of the present application can provide supports with different stiffnesses according to different loads. In this way, when the thrust bearing device 10 is applied to a compressor and in the normal working condition, the elastic support structure 12 with higher stiffness can be used to correspond to the thrust. When the thrust bearing device 10 is applied to a compressor and in the start-stop working condition, the elastic support structure 12 with lower stiffness can be used to correspond to the thrust. Compared with using the elastic support structure 12 with the same stiffness to cope, using the elastic support structure 12 with lower stiffness to correspond to the thrust when the compressor is in the start-stop working condition can avoid excessive wear on the bearing surface, and at the same time can meet the thrust requirements under the change of pressure ratio or pressure difference, thereby solving the problem of high stiffness and high wear and improving the service life of the thrust bearing device 10.

[0038] It should be noted that the stiffnesses of at least two elastic support structures 12 are different, and the dimensions of at least two elastic support structures 12 along the axis direction of the bearing body 11 should also be different. For example, the elastic support structure 12 with lower stiffness has a larger dimension along the axis direction of the bearing body 11, and the elastic support structure 12 with higher stiffness has a smaller dimension along the axis direction of the bearing body 11. In this way, when the load is low, the elastic support structure 12 with lower stiffness and larger dimension is used for support, and when the load is high, the elastic support structure 12 with higher stiffness and smaller dimension is superimposed for support.

[0039] Of course, it is also possible that the elastic support structure 12 with lower stiffness has a smaller dimension along the axis direction of the bearing body 11, and the elastic support structure 12 with higher stiffness has a larger dimension along the axis direction of the bearing body 11.

[0040] The following specifically describes the specific structure of the thrust bearing device 10 provided by the embodiments of the present application.

[0041] In some embodiments, any one of the elastic support structures 12 is the same. Specifically, any one of the elastic support structures 12 includes a first foil 121, a second foil 122, and an elastic member 123. The elastic member 123 is arranged between the first foil 121 and the second foil 122, and the elastic member 123 is used to provide an elastic force along the axis direction of the bearing body 11, so that the first foil 121 or the second foil 122 has a tendency to move away from the bearing body 11.

[0042] Specifically, when the thrust bearing device 10 bears an axial load, the elastic member 123 is compressed, and the elastic member 123 provides an elastic force in the axial direction of the bearing body 11. Preferably, the elastic member 123 is in the form of a corrugated foil structure, and the first foil 121 and the second foil 122 respectively abut against both sides of the elastic member 123 in the axial direction of the bearing body 11.

[0043] Of course, according to actual needs, the elastic member 123 can also be a spring structure.

[0044] It can be understood that the elastic support structures 12 can be arranged at intervals (not connected) in the circumferential direction on the bearing body 11, or can be integrally connected and then arranged on the bearing body 11. This text does not make specific restrictions on this.

[0045] In some embodiments, the second foil 122 is arranged between the elastic member 123 and the bearing body 11, and the second foils 122 are integrally connected and arranged on the bearing body 11. Of course, according to actual needs, the connection manner between the second foil 122 and the bearing body 11 includes but is not limited to welding, gluing, etc.

[0046] In some embodiments, the shape of the second foils 122 after being integrally connected is adapted to the shape of the bearing body 11. That is to say, for the annular bearing body 11, the second foils 122 after being integrally connected are also in an annular structure, and the individual second foil 122 is in an arc-shaped structure. At the same time, the dimension of the second foils 122 after being integrally connected in the radial direction can be less than or equal to the dimension of the bearing body 11 in the radial direction.

[0047] In some embodiments, any two adjacent elastic support structures 12 are arranged at intervals in the circumferential direction of the bearing body 11. In this way, the elastic support structures 12 are respectively arranged on the bearing body 11 as independent individuals.

[0048] Both the first foil 121 and the second foil 122 in each elastic support structure 12 are in an arc-shaped structure. Among them, the first foil 121 is the contact part with the load applicator, and the thickness of the first foil 121 can be set to be greater than the thickness of the second foil 122.

[0049] In some embodiments, the elastic support structures 12 are arranged in a staggered manner in the circumferential direction of the bearing body 11, and this staggered arrangement can be a combination of the same elastic support structures 12 in a staggered manner or an independent staggered manner.

[0050] Specifically, several groups of elastic support structures 12 are provided, and each group of elastic support structures 12 is distributed along the circumferential direction of the bearing body 11, and the types of any two adjacent groups of elastic support structures 12 are different. That is to say, the stiffnesses of any two adjacent groups of elastic support structures 12 are different, and the dimensions of any two adjacent groups of elastic support structures 12 along the axial direction are different.

[0051] It can be understood that the number of elastic support structures 12 in any group of elastic support structures 12 can be one, or at least two. And when any group of elastic support structures 12 includes at least two elastic support structures 12, the types of at least two elastic support structures 12 are the same. In other words, the stiffnesses of the elastic support structures 12 in any group of elastic support structures 12 are consistent.

[0052] Preferably, any group of elastic support structures 12 includes two elastic support structures 12 with the same type / stiffness. In this way, the two elastic support structures 12 form a group and are distributed along the circumferential direction of the bearing body 11.

[0053] In some embodiments, there are two types of elastic support structures 12, namely the first type of elastic support structure 12 and the second type of elastic support structure 12. Each first type of elastic support structure 12 is arranged at intervals along the circumferential direction of the bearing body 11, and a second type of elastic support structure 12 is provided between every two first type of elastic support structures 12.

[0054] In some embodiments, the dimension of the first type of elastic support structure 12 along the axial direction is greater than that of the second type of elastic support structure 12 along the axial direction, and the stiffness of the first type of elastic support structure 12 is less than that of the second type of elastic support structure 12.

[0055] That is to say, the first type of elastic support structure 12 with low stiffness has a larger dimension along the axial direction of the bearing body 11, and the second type of elastic support structure 12 with high stiffness has a smaller dimension along the axial direction of the bearing body 11.

[0056] In this way, under low load, the first type of elastic support structure 12 with low stiffness and large dimension is used for support. When the load continues to increase, the elastic member 123 of the first type of elastic support structure 12 with low stiffness and large dimension is continuously compressed until the first foil 121 of the first type of elastic support structure 12 and the first foil 121 of the second type of elastic support structure 12 are in the same plane. After that, the first type of elastic support structure 12 and the second type of elastic support structure 12 are superimposed to provide support.

[0057] When designed in this way, the thrust bearing device 10 realizes thrust with a relatively low stiffness to a large extent, thereby further reducing wear.

[0058] Of course, according to actual needs, it can also be set such that the dimension of the low-stiffness elastic support structure 12 in the axial direction of the bearing body 11 is smaller, and the dimension of the high-stiffness elastic support structure 12 in the axial direction of the bearing body 11 is larger. When designed in this way, the thrust bearing device 10 is first supported by the high-stiffness elastic support structure 12. After the first foil 121 of the high-stiffness elastic support structure 12 and the first foil 121 of the low-stiffness elastic support structure 12 are in the same plane, the high-stiffness elastic support structure 12 and the low-stiffness elastic support structure 12 provide support together after being superimposed.

[0059] In this paper, a setting method in which the dimension of the low-stiffness elastic support structure 12 in the axial direction of the bearing body 11 is larger is preferably adopted.

[0060] In some embodiments, the elastic support structures 12 are evenly distributed along the circumferential direction of the bearing body 11.

[0061] It should be noted that the so-called even distribution of the elastic support structures 12 along the circumferential direction of the bearing body 11 means that the intervals between any two adjacent elastic support structures 12 along the circumferential direction of the bearing body 11 are the same, so that the support force provided by the entire thrust bearing device 10 is more stable and balanced.

[0062] In addition, the elastic members 123 in any two adjacent elastic support structures 12 can be both foil structures or spring structures, or can be a foil structure and a spring structure respectively. This paper does not make specific restrictions on this.

[0063] Of course, in addition to the above equal-interleaving method, it can also be set to an interleaving method of 1:2, that is, two second elastic support structures 12 are arranged between any two adjacent first elastic support structures 12.

[0064] The first elastic support structure 12 or the second elastic support structure 12 can be made of the same material, which can be a metal material or a non-metal material.

[0065] A compressor provided in this application includes a housing, a rotor, a thrust disk, and a thrust bearing device 10. Among them, the rotor is rotatably arranged in the housing; the thrust disk is sleeved on the rotor, and the thrust disk rotates with the rotor; the thrust bearing device 10 is arranged in the housing, and a gap is formed between each elastic support structure 12 of the thrust bearing device 10 and the thrust disk.

[0066] In this way, when the compressor is operating, each elastic support structure 12 of the thrust bearing device 10 can provide an elastic force in the axial direction to the thrust disk, so as to provide stable support in the axial direction.

[0067] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0068] The compressor and its thrust bearing device provided by the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the solution of the present application and its core idea. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A thrust bearing device (10), characterized in that, It includes a bearing body (11) and at least two kinds of elastic support structures (12) arranged along the circumferential direction of the bearing body (11). The stiffnesses of the at least two kinds of elastic support structures (12) are different, and the dimensions of the at least two kinds of elastic support structures (12) along the axial direction of the bearing body (11) are different; There are two kinds of the elastic support structures (12). The dimension of the first kind of elastic support structure (12) along the axial direction is larger than that of the second kind of elastic support structure (12) along the axial direction, and the stiffness of the first kind of elastic support structure (12) is less than that of the second kind of elastic support structure (12).

2. The thrust bearing device (10) according to claim 1, characterized in that, Any one of the elastic support structures (12) includes a first foil (121), a second foil (122) and an elastic member (123). The elastic member (123) is arranged between the first foil (121) and the second foil (122). The elastic member (123) is used to provide an elastic force along the axial direction of the bearing body (11) to make the first foil (121) or the second foil (122) have a tendency to move away from the bearing body (11).

3. The thrust bearing device (10) according to claim 2, characterized in that, The elastic member (123) is in a corrugated shape or a spring structure. The first foil (121) and the second foil (122) respectively abut against both sides of the elastic member (123) along the axial direction of the bearing body (11).

4. The thrust bearing device (10) according to claim 2, characterized in that, The second foil (122) is arranged between the elastic member (123) and the bearing body (11). The second foils (122) are integrally connected to each other and are arranged on the bearing body (11).

5. The thrust bearing device (10) according to claim 4, characterized in that, The shape of the second foils (122) after being integrally connected to each other is adapted to the shape of the bearing body (11).

6. The thrust bearing device (10) according to any one of claims 1-5, characterized in that, A number of groups of the elastic support structures (12) are provided. The groups of elastic support structures (12) are distributed along the circumferential direction of the bearing body (11), and the kinds of any two adjacent groups of elastic support structures (12) are different.

7. The thrust bearing device (10) according to claim 6, characterized in that, Any one group of the elastic support structures (12) includes at least two elastic support structures (12) of the same kind.

8. The thrust bearing device (10) according to any one of claims 1-5, characterized in that, Each of the elastic support structures (12) is evenly distributed along the circumferential direction of the bearing body (11).

9. A compressor, characterized in that, It includes: A housing; A rotor rotatably arranged in the housing; A thrust disc sleeved on the rotor and rotating with the rotor; The thrust bearing device (10) according to any one of claims 1-8. The thrust bearing device (10) is arranged in the housing, and a gap is formed between each of the elastic support structures (12) of the thrust bearing device (10) and the thrust disc.

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