Bearing bush, tilting-pad thrust bearing and gas turbine

Abstract

The invention discloses a bearing bush, a tilting-pad thrust bearing and a gas turbine, the bearing bush is provided with an acting surface used for bearing fluid, the acting surface is provided with a groove structure, the groove structure comprises a main flow channel and a branch flow channel, the main flow channel extends along a first direction, and the branch flow channel extends along a second direction. The first direction is opposite to the moving direction of the bearing bush relative to a rotor when the bearing bush is used, and the main flow channel is used for storing fluid and guiding the fluid to flow in the first direction; and the branch flow channel is arranged beside the main flow channel, the two ends of the branch flow channel communicate with the main flow channel, and the branch flow channel is used for guiding the fluid to circularly flow back into the main flow channel in the direction opposite to the first direction. According to the bearing bush, the problem of large frictional wear of the bearing can be avoided, so that the overall power consumption can be reduced, secondly, the effect of enhancing the rigidity of a fluid film can be achieved, and the problem that the operation stability of the bearing is poor easily caused by large pressure fluctuation of the fluid film is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, and in particular, to a bearing bush, a tilting pad thrust bearing, and a gas turbine. Background Art

[0002] A tilting pad thrust bearing is a bearing that can withstand a large thrust load and is widely used in gas turbines. However, in actual use, the tilting pad thrust bearing has problems such as large friction and wear, high power consumption, poor rigidity of the oil film in the bearing clearance, large pressure fluctuations of the oil film, and poor stability of the bearing operation. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent.

[0004] To this end, an embodiment of the present invention provides a bearing bush that can avoid the problem of large friction and wear of the bearing, thereby reducing the overall power consumption. Secondly, it can also enhance the rigidity of the fluid film and avoid the problem of poor stability of the bearing operation caused by large pressure fluctuations of the fluid film.

[0005] An embodiment of the present invention further provides a tilting pad thrust bearing including the above bearing bush.

[0006] An embodiment of the present invention further provides a gas turbine including the above tilting pad thrust bearing.

[0007] The bearing bush of the embodiment of the present invention has a working surface for carrying a fluid, and the working surface is provided with a groove structure, and the groove structure includes:

[0008] A main flow channel that extends along a first direction, and the first direction is opposite to the movement direction of the bearing bush relative to the rotor during use. The main flow channel is used for storing the fluid and guiding the fluid to flow along the first direction;

[0009] A branch flow channel that is provided beside the main flow channel, and both ends of the branch flow channel are communicated with the main flow channel. The branch flow channel is used for guiding the fluid to circulate and flow back to the main flow channel along a direction opposite to the first direction.

[0010] In some embodiments, the groove structure includes a plurality of branch flow channels, and the plurality of branch flow channels are provided on at least one side of the main flow channel, and the plurality of branch flow channels on the same side of the main flow channel are arranged at intervals along the first direction.

[0011] In some embodiments, the main runner has a first side and a second side, the first side and the second side are arranged opposite to each other in a second direction perpendicular to the first direction, the branch runners are provided on both the first side and the second side, and the branch runners on the first side and the branch runners on the second side are arranged offset in the first direction.

[0012] In some embodiments, a plurality of the branch runners are provided on both the first side and the second side, the first side is the inner side of the bearing bush, the second side is the outer side of the bearing bush, and the plurality of branch runners on the first side and the plurality of branch runners on the second side are arranged alternately one by one.

[0013] In some embodiments, the main runner has an inlet, the distance between the branch runner adjacent to the opening among the plurality of branch runners on the first side and the opening is L1, the distance between the branch runner adjacent to the opening among the plurality of branch runners on the second side and the opening is L2, and L1 is less than L2.

[0014] In some embodiments, the branch runner includes a first runner segment and a second runner segment, the first runner segment is located upstream of the second runner segment, the angle formed by the second runner segment and the main runner is an acute angle, and the first runner segment is arc-shaped and is smoothly connected to the second runner segment.

[0015] In some embodiments, a partition portion is provided between the main runner and the branch runner, and the cross-section of the partition portion is circular, water-drop-shaped, triangular, or semi-circular;

[0016] Or, the area of the flow-through cross-section of the second runner segment gradually increases along the direction away from the first runner segment.

[0017] In some embodiments, the direction from the inside to the outside of the bearing bush is defined as the second direction, the second direction is perpendicular to the first direction, there are a plurality of the groove structures, and the plurality of groove structures are arranged at intervals along the second direction;

[0018] The width dimension of the acting surface in the first direction gradually increases along the second direction, and the length dimensions of the plurality of groove structures show an increasing trend along the second direction;

[0019] And / or, the width dimension D of the main runner is greater than the width dimension d of the branch runner;

[0020] And / or, the main runner is arc-shaped, and the main runners of the plurality of groove structures are concentrically arranged.

[0021] The tilting pad thrust bearing according to the embodiment of the present invention includes a bearing housing and a plurality of bearing bushes as described in any one of the above embodiments, and the plurality of bearing bushes are arranged at intervals along the circumferential direction of the bearing housing.

[0022] The gas turbine of the embodiment of the present invention includes a tilting pad thrust bearing as described in any one of the above embodiments.

[0023] Beneficial effects: The bearing bush, tilting pad thrust bearing and gas turbine of the embodiment of the present invention. The bearing bush can avoid the problem of large bearing friction and wear, thereby reducing the overall power consumption. Secondly, it can also enhance the rigidity of the fluid film and avoid the problem of poor bearing running stability caused by large pressure fluctuations of the fluid film. Description of the Drawings

[0024] Figure 1 is a schematic structural view of the bearing bush of the embodiment of the present invention Figure 1 .

[0025] Figure 2 is a schematic structural view of the bearing bush of the embodiment of the present invention Figure 2 .

[0026] Figure 3 is a schematic structural view of the bearing bush of another embodiment of the present invention.

[0027] Figure 4 is a partial schematic structural view of the tilting pad thrust bearing of the embodiment of the present invention.

[0028] Reference Signs:

[0029] 100 - bearing bush;

[0030] 1 - acting surface;

[0031] 2 - groove structure; 21 - main flow channel; 211 - inlet; 22 - branch flow channel; 221 - first flow channel section; 222 - second flow channel section;

[0032] 3 - first side; 4 - second side; 5 - separating part;

[0033] 200 - bearing housing. Detailed Embodiments

[0034] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0035] The bearing bush 100 of the embodiment of the present invention has an acting surface 1 for carrying fluid. For example, as Figure 1As shown, the bearing shell 100 can generally be a flat structure. In the thickness direction of the bearing shell 100, the bearing shell 100 has two large surfaces distributed relatively. The large surface is the surface with the largest area on the bearing shell 100. One of the large surfaces is used to install and fix the bearing shell 100 to the bearing seat 200, etc., and the other large surface can be arranged facing the shaft shoulder of the rotor, etc. The large surface facing the shaft shoulder mentioned above is the working surface 1.

[0036] During actual installation and arrangement, a circumferential space can be arranged between the working surface 1 and the above-mentioned shaft shoulder, and the circumferential space is used for fluid to flow in. The fluid can specifically be gas, lubricating oil, etc. Under the action of the relative rotation between the working surface 1 and the shaft shoulder, the fluid can form a fluid film in the circumferential space, so as to play a role in pushing the bearing shell 100 to separate the bearing shell 100 from the shaft shoulder during rotation.

[0037] As Figure 1 shown, the working surface 1 is provided with a groove structure 2, and the groove structure 2 includes a main flow channel 21 and branch flow channels 22. The main flow channel 21 extends along a first direction, and the first direction is opposite to the movement direction of the bearing shell 100 relative to the rotor during use. The main flow channel 21 is used to store fluid and guide the fluid to flow along the first direction.

[0038] For example, as Figure 1 shown, the main flow channel 21 can be a long groove with a rectangular cross-section and extends along the first direction. One end of the main flow channel 21 can communicate with the side surface of the bearing shell 100 to form an inlet 211, and the other end of the main flow channel 21 can be closed. It should be noted that during actual use, the bearing shell 100 can have a tendency to rotate clockwise relative to the rotor along Figure 1 The above-mentioned first direction is the direction opposite to the clockwise rotation direction, that is, the counterclockwise rotation direction in Figure 1 .

[0039] During use, the above-mentioned fluid can flow into the main flow channel 21 from the inlet 211 of the main flow channel 21, and then under the action of the relative rotation between the bearing shell 100 and the rotor, the fluid can flow along the first square in the main flow channel 21.

[0040] The branch flow channels 22 are arranged beside the main flow channel 21. Both ends of the branch flow channels 22 are communicated with the main flow channel 21. The branch flow channels 22 are used to guide the fluid to circulate and flow back to the main flow channel 21 along the direction opposite to the first direction.

[0041] For example, as Figure 1As shown, one or more branch channels 22 may be provided, and the bearing shell 100 may have an inner side facing the rotation center and an outer side away from the rotation center during actual installation. The branch channel 22 may be provided on the inner side or the outer side of the main channel 21. The branch channel 22 may be arranged in parallel with the main channel 21. When in use, the fluid flowing from the main channel 21 into the branch channel 22 may be redirected to the main channel 21 by the branch channel 22, that is, at the branch channel 22, the fluid may form a cycle.

[0042] The bearing 100 of the embodiment of the present invention is provided with a groove structure 2, which can store and guide the flow of fluid, thereby ensuring the capacity of the fluid in the above-mentioned annular space, and allowing the fluid to circulate between the main channel 21 and the branch channel 22, avoiding the situation where the fluid flows out of the groove structure 2 quickly, ensuring the formation of a fluid film, avoiding the problem of large friction and wear of the bearing, and further avoiding the overall high power consumption caused by friction and wear, reducing the cost of use, and saving energy.

[0043] Secondly, the bearing 100 will have a change in inclination angle during actual use, and this change in inclination will cause a change in the thickness of fluid films such as oil films, which in turn may easily cause large pressure fluctuations in the fluid film and poor overall operating stability.

[0044] The bearing 100 of the embodiment of the present invention is provided with a branch channel 22 beside the main channel 21. At the junction of the branch channel 22 and the main channel 21, the dynamic pressure effect can be enhanced due to the different flow directions of the fluid, so that multiple local high-pressure areas can appear in the fluid film. The pressure distribution of this fluid film is beneficial to improving the stiffness of the fluid film, and further can play a role in better stabilizing the fluid film, thereby improving the problems of large pressure fluctuations and poor overall operating stability of the fluid film.

[0045] In addition, due to the reflux effect of the branch channel 22, the fluid in the branch channel 22 can flow back to the main channel 21 by itself. This reflux form can also enhance the stiffness of the fluid film, thereby improving the performance of the bearing and increasing the service life of the bearing.

[0046] In some embodiments, the groove structure 2 includes a plurality of branch channels 22 , the plurality of branch channels 22 are disposed on at least one side of the main channel 21 , and the plurality of branch channels 22 on the same side of the main channel 21 are spaced apart along the first direction.

[0047] For example, Figure 1As shown, a plurality of branch channels 22 can be provided on both the inner side and the outer side of the main channel 21, and the plurality of branch channels 22 on the inner side and the outer side of the main channel 21 can be arranged at equal intervals along the first direction. By increasing the number of branch channels 22, it can play a role in increasing the flow to different junctions, thereby increasing the number of local high-pressure regions, further improving the bearing capacity and stiffness of the fluid film, and further improving the stability of the fluid film.

[0048] In some embodiments, the main channel 21 has a first side 3 and a second side 4, the first side 3 and the second side 4 are arranged opposite to each other in a second direction perpendicular to the first direction, branch channels 22 are provided on both the first side 3 and the second side 4, and the branch channels 22 on the first side 3 and the branch channels 22 on the second side 4 are arranged in a staggered manner in the first direction.

[0049] For example, as Figure 1 shown, the first direction can be the circumferential direction of the bearing shell 100, the second direction can be the inner and outer direction of the bearing shell 100, the first side 3 can be the inner side of the main channel 21, the second side 4 can be the outer side of the main channel 21, a plurality of branch channels 22 can be provided on both the inner side and the outer side of the main channel 21, and the branch channels 22 on the inner side and the branch channels 22 on the outer side can be arranged non-facing in the second direction.

[0050] Thus, the distribution of the above local high-pressure regions can be made more balanced and reasonable, which is beneficial to further improving the stability of the fluid film at each position.

[0051] In some embodiments, a plurality of branch channels 22 are provided on both the first side 3 and the second side 4, the first side 3 is the inner side of the bearing shell 100, the second side 4 is the outer side of the bearing shell 100, and the plurality of branch channels 22 on the first side 3 and the plurality of branch channels 22 on the second side 4 are arranged alternately one by one.

[0052] For example, as Figure 1 shown, three branch channels 22 can be provided on both the first side 3 and the second side 4 of the main channel 21, and the three branch channels 22 on the first side 3 and the three branch channels 22 on the second side 4 can be arranged alternately one by one along the first direction. Since each local high-pressure region has a certain range, this arrangement form can play a role in effectively utilizing the space, that is, it can increase the number of local high-pressure regions as much as possible while avoiding the easy interference between adjacent two local high-pressure regions, ensuring the stability of the fluid film.

[0053] In some embodiments, as Figure 2 shown, the main channel 21 has an inlet 211, the distance between the branch channel 22 adjacent to the opening and the opening among the plurality of branch channels 22 on the first side 3 is L1, the distance between the branch channel 22 adjacent to the opening and the opening among the plurality of branch channels 22 on the second side 4 is L2, and L1 is less than L2.

[0054] Since the first side 3 is the inner side of the main flow channel 21, under the action of centrifugal force and the like, the flow velocity of the fluid on the first side 3 will be slightly less than that of the fluid on the second side 4. By designing the distance L1 to be closer to the opening, the impact of the fluid in the branch flow channel 22 on the fluid in the main flow channel 21 near the opening can be reduced, thereby ensuring the overall flow velocity of the fluid in the main flow channel 21, and further ensuring the formation of local high-pressure regions at each branch flow channel 22 far from the inlet 211.

[0055] In some embodiments, the branch flow channel 22 includes a first flow channel section 221 and a second flow channel section 222. The first flow channel section 221 is located upstream of the second flow channel section 222. The included angle formed by the second flow channel section 222 and the main flow channel 21 is an acute angle. The first flow channel section 221 is arc-shaped and is smoothly connected to the second flow channel section 222.

[0056] For example, as Figure 2 shown, the second flow channel section 222 can generally be linear. The second flow channel section 222 can extend along the first direction as a whole. The included angle formed by the second flow channel section 222 and the main flow channel 21 can be angle a, and angle a can be an acute angle. Thus, the impact on the fluid in the main flow channel 21 within the second flow channel section 222 can be reduced, which is beneficial to ensuring the flow velocity of the fluid in the main flow channel 21.

[0057] The first flow channel section 221 can generally be arc-shaped. Both ends of the first flow channel section 221 can be smoothly connected to the main flow channel 21, which is beneficial to reducing the flow resistance and meeting the use requirement of changing the fluid flow direction.

[0058] In some embodiments, a partition 5 is provided between the main flow channel 21 and the branch flow channel 22. For example, as Figure 2 shown, the partition 5 can be a protrusion integrally formed on the bearing shell 100. The partition 5 can protrude toward the acting surface 1 along the thickness direction of the bearing shell 100. The setting of the partition 5 facilitates the construction of the branch flow channel 22.

[0059] Optionally, as Figure 2 shown, the cross-section of the partition 5 can be a water droplet shape. In some other embodiments, as Figure 3 shown, the cross-sectional shape of the partition 5 can also be a circle, etc. In some other embodiments, the cross-section of the partition 5 can also be a triangle, a semi-circle, etc.

[0060] In some embodiments, the cross-sectional area of the second flow channel section 222 gradually increases along the direction away from the first flow channel section 221. For example, as Figure 3As shown, the cross-section of the second flow channel section 222 can gradually increase in the direction towards the opening of the main flow channel 21, which is beneficial to slowing down the flow velocity of the second flow channel section 222 flowing towards the main flow channel 21, and can further reduce the impact on the fluid in the main flow channel 21.

[0061] In some embodiments, as Figure 1 shown, the direction from the inside to the outside of the bearing shell 100 is defined as the second direction, the second direction is perpendicular to the first direction, there are a plurality of groove structures 2, and the plurality of groove structures 2 are arranged at intervals along the second direction. By providing the plurality of groove structures 2, the bearing capacity and stiffness of the fluid film can be further improved, and thus the stability of the fluid film can be improved.

[0062] Secondly, by providing the plurality of groove structures 2, it is also possible to avoid the situation where a single flow channel is blocked and the surface is ablated easily due to the too high viscosity of the fluid film, the entry of impurities in the fluid, etc., ensuring the overall operating stability.

[0063] In some embodiments, the width dimension of the acting surface 1 in the first direction gradually increases along the second direction, and the length dimensions of the plurality of groove structures 2 show an increasing trend along the second direction.

[0064] For example, as Figures 1 to 3 shown, the acting surface 1 can generally be trapezoidal, the width dimension of the acting surface 1 gradually increases along the direction from the inside to the outside, the length dimension of the groove structure 2 can be regarded as the dimension of the groove structure 2 along the first direction, and being adapted to the shape of the acting surface 1, the length dimensions of the plurality of groove structures 2 can gradually become longer along the direction from the inside to the outside, so that the groove structures 2 can cover the entire acting surface 1, fully ensuring the bearing capacity of the fluid film in each region.

[0065] In some embodiments, as Figure 2 shown, the width dimension D of the main flow channel 21 is greater than the width dimension d of the branch flow channel 22. Thus, the flow rate of the fluid in the main flow channel 21 is fully ensured, and further the ratio of the flow rate of the fluid in the main flow channel 21 to the flow rate of the fluid in the plurality of branch flow channels 22 can be ensured.

[0066] In some embodiments, the main flow channel 21 is arc-shaped, and the plurality of groove structures 2 are concentrically arranged with the main flow channel 21. For example, as Figure 2 shown, both the inner side surface and the outer side surface of the bearing shell 100 can be arc-shaped, and the main flow channels 21 of the plurality of groove structures 2 can also be arc-shaped, wherein the radius of the circle corresponding to the inner side surface of the bearing shell 100 can be r i , the radius of the circle corresponding to the outer side surface of the bearing shell 100 can be r o . r m1 can be the radius of the circle corresponding to the main flow channel 21 of the innermost groove structure 2, r m2It may be the radius, r, of the circle corresponding to the main runner 21 of the second groove structure 2 from the inside out. m3 It may be the radius, r, of the circle corresponding to the main runner 21 of the third groove structure 2 from the inside out. m4 It may be the radius of the circle corresponding to the main runner 21 of the fourth groove structure 2 from the inside out.

[0067] The centers of the above-mentioned respective circles may be located at the same center, which is beneficial to improving the balance of the overall structural distribution, and further can ensure the balance of the distribution of the above-mentioned multiple local high-pressure areas.

[0068] The tilting pad thrust bearing of the embodiment of the present invention will be described below.

[0069] As Figure 4 As shown, the tilting pad thrust bearing of the embodiment of the present invention includes a bearing housing 200 and a plurality of tilting pads 100. Each tilting pad 100 can be the tilting pad 100 described in any of the above embodiments. The bearing housing 200 is generally annular, and the plurality of tilting pads 100 are arranged at equal intervals along the circumferential direction of the bearing housing 200. Specifically, each tilting pad 100 can be assembled on the bearing housing 200 through a spherical surface or cylindrical support, etc., so that the tilting pad 100 can tilt and adjust around the fulcrum within a certain range.

[0070] The tilting pad thrust bearing may further include a rotor. The rotor may specifically be a rotating shaft, etc. An axial shoulder may be provided on the rotating shaft. The axial shoulder may also be annular and may be provided in a circle along the circumferential direction of the rotating shaft. The above-mentioned bearing housing 200 can be sleeved on the outer peripheral side of the rotating shaft, and the above-mentioned plurality of tilting pads 100 can be arranged opposite to the axial shoulder in the axial direction of the rotating shaft. When the rotor rotates, a fluid film can be formed between the axial shoulder and the tilting pads 100.

[0071] The gas turbine of the embodiment of the present invention will be described below.

[0072] The gas turbine of the embodiment of the present invention includes a tilting pad thrust bearing, and the tilting pad thrust bearing can be the tilting pad thrust bearing described in any of the above embodiments.

[0073] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0074] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0075] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0077] In the present invention, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0078] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A bearing shell, characterized in that, It has a working surface for carrying fluid, and the working surface is provided with a groove structure, which includes: A main flow channel that extends along a first direction, which is opposite to the movement direction of the bearing bush relative to the rotor during use. The main flow channel is used to store fluid and guide the fluid to flow along the first direction; A branch flow channel that is arranged beside the main flow channel. Both ends of the branch flow channel are communicated with the main flow channel. The branch flow channel is used to guide the fluid to circulate and flow back into the main flow channel along a direction opposite to the first direction.

2. The bearing shell according to claim 1, wherein, The groove structure includes a plurality of branch flow channels. The plurality of branch flow channels are arranged on at least one side of the main flow channel, and the plurality of branch flow channels on the same side of the main flow channel are arranged at intervals along the first direction.

3. The bearing shell according to claim 2, wherein The main flow channel has a first side and a second side, which are oppositely arranged in a second direction perpendicular to the first direction. The first side and the second side are both provided with the branch flow channels, and the branch flow channels on the first side and the branch flow channels on the second side are arranged in a staggered manner in the first direction.

4. The bearing shell according to claim 3, characterized in that, Both the first side and the second side are provided with a plurality of the branch flow channels. The first side is the inner side of the bearing bush, and the second side is the outer side of the bearing bush. The plurality of branch flow channels on the first side and the plurality of branch flow channels on the second side are arranged alternately one by one.

5. The bearing shell according to claim 4, characterized in that, The main flow channel has an inlet. The distance between the branch flow channel adjacent to the opening among the plurality of branch flow channels on the first side and the opening is L1, and the distance between the branch flow channel adjacent to the opening among the plurality of branch flow channels on the second side and the opening is L2. L1 is less than L2.

6. The bearing shell according to claim 1, wherein The branch flow channel includes a first flow channel section and a second flow channel section. The first flow channel section is located upstream of the second flow channel section. The included angle formed by the second flow channel section and the main flow channel is an acute angle. The first flow channel section is arc-shaped and is smoothly connected to the second flow channel section.

7. The bearing shell according to claim 6, wherein A partition is provided between the main flow channel and the branch flow channel. The cross-section of the partition is circular, water-drop-shaped, triangular, or semi-circular; Or, the cross-sectional area of the second flow channel section gradually increases along the direction away from the first flow channel section.

8. The bearing shell according to any one of claims 1-7, characterized in that, Define the direction from the inside to the outside of the bearing bush as the second direction, which is perpendicular to the first direction. There are a plurality of the groove structures, and the plurality of the groove structures are arranged at intervals along the second direction; The width dimension of the working surface in the first direction gradually increases along the second direction, and the length dimensions of the plurality of the groove structures show an increasing trend along the second direction; And / or, the width dimension D of the main flow channel is greater than the width dimension d of the branch flow channel; And / or, the main flow channel is arc-shaped, and the main flow channels of the plurality of the groove structures are concentrically arranged.

9. A tilting pad thrust bearing, characterized in that, It includes a bearing housing and a plurality of bearing bushes as described in any one of the above claims 1-8, and the plurality of bearing bushes are arranged at intervals along the circumferential direction of the bearing housing.

10. A gas turbine, characterized in that, It includes a tilting pad thrust bearing as described in the above claim 9.

Images