An adaptive radial-thrust combined bearing suitable for high-speed and heavy-load conditions

Abstract

The present invention provides an adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions, comprising a bearing body, a thrust fixed pad and a radial tilting pad, wherein the bearing body comprises a radial part and a thrust part; the thrust fixed pad is fixedly installed at one end of the thrust part along the circumferential direction, and the radial tilting pad is arranged inside the radial part along the circumferential direction; a cavity structure is arranged on one side of the thrust fixed pad for forming a friction pair, for forming an oil film, and the radial tilting pad comprises a load-bearing radial tilting pad and an unload-bearing radial tilting pad, and micro-textures are distributed on the load-bearing radial tilting pad. The radial part pad of the present invention is provided with micro-textures at the load-bearing part, which can effectively reduce the contact area between the friction pairs, thereby reducing contact deformation and local pressure concentration, and further reducing the friction coefficient; the thrust part pad is provided with a cavity structure, which can greatly reduce the lubricating oil temperature between the friction pairs, ensure the fluid viscosity, and greatly improve the axial load-bearing capacity and anti-eccentric load performance of the bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical manufacturing, and in particular to an adaptive radial-thrust integrated combined bearing suitable for high-speed and heavy-load working conditions. Background Art

[0002] Compared with rolling bearings, sliding bearings have great advantages in terms of working noise, rotation accuracy, load-bearing capacity, manufacturing cost and adaptability. At present, the research on sliding bearings is mostly concentrated in the fields of fixed pad sliding bearings, elliptical sliding bearings, water-lubricated sliding bearings, tilting pad radial sliding bearings, fixed pad thrust bearings and gas thrust bearings. With the demand for higher speeds of rotating machinery, the rotor system needs to pass the critical speed or operate around the critical speed, and the solution to the rotor vibration control problem is becoming more urgent; the deadweight of the propeller at the tail of the ship propulsion system causes the propulsion shaft system to bend, and the bearing is inevitably affected by the eccentric load, which is easy to cause the journal to contact the bearing, and then the bearing is damaged due to the generation of dry friction, causing losses.

[0003] In the past decade, high-power, high-speed, and heavy-load rotating machinery has developed rapidly. As the core component of rotating machinery, the supporting structure needs to meet more demanding operating conditions. The shortcomings of the existing technology are: radial sliding bearings and thrust bearings can only withstand loads in a single direction; under high-speed and heavy-load conditions, the sliding oil temperature rises rapidly, and the viscosity decreases rapidly, resulting in dry friction and bearing damage, and poor stability; under heavy-load conditions, the oil supply system is difficult to ensure that a stable oil film is formed on each friction pair of the bearing; the existing radial-thrust integrated bearings are sensitive to eccentric load conditions and do not have good anti-eccentric load capabilities. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide an adaptive radial-thrust integrated combined bearing suitable for high-speed and heavy-load conditions.

[0005] According to the present invention, an adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions comprises a bearing body, a thrust fixed pad and a radial tilting pad, wherein the bearing body comprises a radial part and a thrust part;

[0006] The thrust fixed pad is fixedly mounted at one end of the thrust portion along the circumferential direction, and the radial tilting pad is arranged inside the radial portion along the circumferential direction;

[0007] The thrust fixed pad is provided with a cavity structure on one side for forming a friction pair, for forming an oil film. The radial tilting pad includes a load-bearing radial tilting pad and an unload-bearing radial tilting pad. Micro textures are distributed on the load-bearing radial tilting pad.

[0008] Preferably, the load-bearing radial tilting pad is located at a position in the direction in which the radial part of the bearing bears the load, and the unloaded radial tilting pad is located at a position opposite to the direction in which the radial part of the bearing bears the load;

[0009] The inner side surface of the unloaded radial tilting pad is a smooth curved surface.

[0010] Preferably, the cavity structure of the thrust fixing pad includes a step type, a slope type, a step pocket type or a slope pocket type;

[0011] The bottom surface of the cavity structure is recessed relative to the friction surface of the thrust fixing pad, and the oil enters the friction pair from the side opening of the cavity structure to form an oil film.

[0012] Preferably, the micro texture on the load-bearing radial tilting pad includes cylindrical depressions, hemispherical depressions, conical depressions or prismatic depressions.

[0013] Preferably, the distribution of the micro-texture on the load-bearing radial tilting pad includes uniform array distribution, axial non-uniform array distribution, circumferential non-uniform array arrangement and annular arrangement;

[0014] In the axial non-uniform array distribution, multiple micro-textures form multiple rows along the axial direction, and the multiple rows of micro-textures are non-uniformly distributed on the inner side of the load-bearing radial tilting pad;

[0015] In the circumferential non-uniform array arrangement, a plurality of micro-textures form a plurality of rows along the circumferential direction, and the plurality of rows of micro-textures are non-uniformly distributed on the inner side of the load-bearing radial tilting pad.

[0016] Preferably, the radial tilting pad is movably arranged inside the radial part along the circumferential direction;

[0017] An oil injection screw is arranged at the gap between adjacent radial tilting pads. The oil injection screw is fixedly installed on the inner side of the radial part and is used to limit the radial tilting pad.

[0018] Preferably, the thrust fixing pads are evenly arranged along the circumferential direction, and limiting screws are arranged at the gaps between adjacent thrust fixing pads, and the limiting screws are fixedly installed at one end of the thrust part.

[0019] Preferably, an oil inlet channel corresponding to the oil injection screw is circumferentially arranged on the radial portion, and the oil injection screw is arranged in the oil inlet channel.

[0020] Preferably, an oil supply groove is provided on the side of the thrust portion.

[0021] Preferably, the radial portion and the thrust portion are coaxially assembled via a fixing member.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The radial part of the pad of the present invention is provided with a micro-texture at the load-bearing position, which can effectively reduce the contact area between the friction pairs, thereby reducing the contact deformation and local pressure concentration, and further reducing the friction coefficient. The thrust part of the pad is provided with a cavity structure, which can greatly reduce the lubricating oil temperature between the friction pairs, ensure the fluid viscosity, and greatly improve the axial bearing capacity and anti-eccentric load performance of the bearing.

[0024] 2. The present invention adopts the technical means of limiting the radial pads by the injection screw. The radial pads can swing with different working conditions such as rotation speed and load, so that the lubricating oil can smoothly enter the friction pair to form a stable oil film. The oil film force formed by it passes through the center of the journal and is in the opposite direction of the external load, so it has good stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the installation position of the radial tilting pad in the present invention;

[0028] Figure 3 It is a schematic diagram of the installation position of the thrust fixing tile and the limit screw in the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the present invention from a side view angle;

[0030] Figure 5 for Figure 4 A schematic cross-sectional view at the 1-1 angle;

[0031] Figure 6 It is a schematic diagram of the structure of the micro-texture on the radial tilting pad in the present invention;

[0032] Figure 7 It is a structural schematic diagram of the thrust fixing pad cavity structure in the present invention;

[0033] Figure 8 It is a schematic diagram of the distribution of the radial tilting pad micro-texture on the radial tilting pad in the present invention.

[0034] The figure shows:

[0035] Thrust fixing pad 1 Limit screw 4

[0036] First thrust fixing pad 11 First limiting screw 41

[0037] Second thrust fixing tile 12 Second limiting screw 42

[0038] The third thrust fixing tile 13 The third limiting screw 43

[0039] Fourth thrust fixing tile 14 Fourth limiting screw 44

[0040] Fifth thrust fixing tile 15 Fifth limit screw 45

[0041] Sixth thrust fixing tile 16 Sixth limiting screw 46

[0042] Seventh thrust fixing tile 17 Seventh limiting screw 47

[0043] Eighth thrust fixing tile 18 Eighth limiting screw 48

[0044] Unloaded radial tilting pad 2 Oil injection screw 5

[0045] First unloaded radial tilting pad 21 First oil injection screw 51

[0046] Second unloaded radial tilting pad 22 Second oil injection screw 52

[0047] The third unloaded radial tilting pad 23 The third oil injection screw 53

[0048] Load-bearing radial tilting pad 3 Fourth injection screw 54

[0049] First load-bearing radial tilting pad 31 Fifth injection screw 55

[0050] Second load-bearing radial tilting pad 32 bearing body 6

[0051] Third load-bearing radial tilting pad 33 fixing member 7 DETAILED DESCRIPTION

[0052] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0053] The present invention discloses an adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load working conditions. Micro-texture is arranged on the radial part of the bearing pad, which can effectively reduce the contact area between the friction pairs, thereby reducing the contact deformation and local pressure concentration, and further reducing the friction coefficient. The thrust part of the pad is provided with a cavity structure, which can greatly reduce the lubricating oil temperature between the friction pairs, ensure the fluid viscosity, and greatly improve the axial bearing capacity and anti-eccentric load performance of the bearing.

[0054] According to the present invention, an adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions is provided. Figure 1-8 As shown, it includes a bearing body 6, a thrust fixing pad 1, an unloaded radial tilting pad 2, a loaded radial tilting pad 3, a limit screw 4, and an injection screw 5. The bearing body 6 consists of two parts, which are connected by screws during installation. This design can greatly reduce the difficulty of bearing manufacturing and installation; the thrust fixing pad 1 is fixedly installed at one end of the thrust part along the circumferential direction, and the radial tilting pad is circumferentially arranged inside the radial part; this design can be used in harsh working conditions of high speed and heavy load.

[0055] In a preferred example, a layer of bearing alloy SnSb8Cu4 is provided on the thrust fixed pad 1, the unloaded radial tilting pad 2, and the loaded radial tilting pad 3. This design can improve the friction reduction and wear resistance of the bearing pad, and its good thermal conductivity and corrosion resistance can avoid the accumulation of a large amount of heat and the occurrence of corrosion caused by friction in the bearing, thereby extending its service life.

[0056] The load-bearing radial tilting pad 3 is processed with micro texture, and this design can reduce the contact area between the friction pairs during the operation of the bearing, thereby reducing the contact deformation and local pressure concentration, and thus reducing the friction coefficient; preferably, the distribution form of the micro texture on the load-bearing radial tilting pad 3 can be adjusted accordingly, such as Figure 8 As shown, the micro-texture distribution density can be increased in the area where the pressure distribution of the pad is larger, and the micro-texture distribution form can be changed according to the speed and load conditions. This design can reasonably select the micro-texture distribution according to the working conditions and reduce the processing difficulty without reducing the bearing performance.

[0057] An oil injection screw 5 is arranged between adjacent radial tilting pads. On the one hand, it can smoothly deliver the lubricating oil into the internal groove of the bearing, and then form an oil film between it and the radial tilting pad through the rotation of the shaft neck. On the other hand, it can limit the movement of the radial tilting pad in the bearing, so that the radial tilting pad can always be located in the designed position.

[0058] The thrust fixing pad 1 is processed with a cavity structure. In actual use, the cavity structure can greatly reduce the temperature of the lubricating oil between the friction pairs, ensure the viscosity of the fluid, and greatly improve the axial bearing capacity of the bearing; the existence of the cavity enables the lubricating oil to enter the friction pair more smoothly when the shaft system is overloaded, thereby enhancing the anti-overload performance of the bearing; the cavity can form a friction pair with a thicker thickness with the journal, generating an oil film force to support the journal; the cavity can generate a static pressure effect with the help of the oil supply system, and provide support when the rotor system is started.

[0059] A limiting screw 4 is arranged between adjacent thrust fixing pads 1. This design can effectively limit the movement of the thrust fixing pads 1 so that the thrust fixing pads 1 are always located at the designed position when working. In addition, oil is sprayed between the thrust fixing pads 1 through the limiting screws 4, so that the lubricating oil can enter the friction pair more smoothly, thereby greatly improving the axial bearing capacity and stability of the bearing.

[0060] The radial pad is set as a tilting pad, and a strip-shaped protrusion is set on the back of the pad, so that the pad can swing freely after being subjected to force, so that the lubricating oil in the groove can smoothly enter the friction pair to form a stable oil film, thereby improving the bearing capacity and stability. In actual use, the radial tilting pad swings freely with the speed, load and bearing temperature, forming multiple convergent wedges around the journal, and the oil film force formed by each convergent wedge passes through the center of the bearing. The resulting oil film force is equal to the external load in magnitude and opposite in direction, thus greatly improving the stability and radial bearing capacity of the bearing.

[0061] Example 1

[0062] This embodiment provides a novel adaptive radial-thrust integrated joint bearing, comprising a thrust fixed pad 1 with a cavity structure, an unloaded radial tilting pad 2 without micro-texture, a loaded radial tilting pad 3 with micro-texture, a limit screw 4, an oil injection screw 5, a bearing body 6 and screw and other fixings 7. The bearing body 6 is composed of a radial part and a thrust part, so that the bearing body 6 can simultaneously install the thrust fixed pad 1 and the radial tilting pad, and simultaneously bear the radial load and axial load of the rotor system, and the bearing body 6 is assembled by screws and other fixings 7.

[0063] like Figure 7 As shown, the cavity structure of the thrust fixing pad 1 can be set to four types: step-shaped, slope-shaped, step-pocket-shaped and slope-pocket-shaped. This design allows the lubricating oil to smoothly enter the friction pair from the groove between the pads to form a stable oil film, thereby improving the bearing capacity and operating stability of the bearing; it reduces the lubricating oil temperature and maintains the lubricating oil viscosity under high-speed and heavy-load conditions to prevent a sudden drop in bearing capacity and dry friction; different cavity structures can adapt to different working conditions, and the design can be combined with the processing technology for comprehensive consideration and reasonable selection.

[0064] like Figure 2 As shown, the unloaded radial tilting pad 2 without micro texture is located at the reverse position of the radial part of the bearing bearing the load, and is mainly used to maintain the stability of the journal during operation. No micro texture is set to reduce the difficulty of processing, and they are respectively the first unloaded radial tilting pad 21, the second unloaded radial tilting pad 22, and the third unloaded radial tilting pad 23, which are located in the upper semicircle along the circumferential direction;

[0065] The load-bearing radial tilting pad 3 containing micro-texture is located at the position of the radial part of the bearing in the direction of load bearing. By setting the micro-texture, the continuity of the oil film pressure can be broken, and its local pressure concentration can be reduced; the contact area can be reduced to reduce the friction loss. They are the first load-bearing radial tilting pad 31 and the second load-bearing radial tilting pad 32, which are located in the lower semicircle along the circumferential direction;

[0066] like Figure 6 As shown, this embodiment provides four types of micro-texture shapes, namely cylindrical, hemispherical, conical and prismatic. The four types of micro-textures are suitable for different speeds and radial load conditions. The arrangement and density of the micro-textures on the load-bearing radial tilting pad 3 containing micro-textures can be adjusted differently, such as Figure 8 As shown, there are four types of micro-texture distribution, including uniform array distribution, axial non-uniform array distribution, circumferential non-uniform array arrangement and annular arrangement. During processing, the appropriate micro-texture distribution can be flexibly selected according to the working conditions.

[0067] The unloaded radial tilting pad 2 and the loaded radial tilting pad 3 will swing after being subjected to force, so that the oil film force of each pad passes through the center of the journal. The resultant oil film force generated by all the pads is equal to the external load in magnitude and opposite in direction, and has extremely strong stability. The swing amplitude can change in real time with the change of working conditions, and has good adaptability.

[0068] The limit screw 4 is located in the gap between the thrust pad 1 and the side of the thrust part is provided with an oil supply groove. The limit screw 4 can supply oil while limiting the movement of the thrust pad, so that the thrust pad is always located at the designed position and obtains a good oil supply environment. Figure 3 As shown, the thrust fixing pad 1 includes a first thrust fixing pad 11, a second thrust fixing pad 12, a third thrust fixing pad 13, a fourth thrust fixing pad 14, a fifth thrust fixing pad 15, a sixth thrust fixing pad 16, a seventh thrust fixing pad 17 and an eighth thrust fixing pad 18 distributed in the circumferential direction, and the limit screws 4 are arranged between adjacent thrust fixing pads 1, and include a first limit screw 41, a second limit screw 42, a third limit screw 43, a fourth limit screw 44, a fifth limit screw 45, a sixth limit screw 46, a seventh limit screw 47 and an eighth limit screw 48 in sequence;

[0069] like Figure 5 As shown, the oil injection screw 5 is located in the radial tilting pad gap, and includes a first oil injection screw 51, a second oil injection screw 52, ​​a third oil injection screw 53, a fourth oil injection screw 54 and a fifth oil injection screw 55 in sequence, which can supply oil while restricting the movement of the radial pad, so that the radial pad is always located at the designed position and obtains a good oil supply environment. The radial part is circumferentially distributed with oil inlet channels corresponding to the oil injection screws 5.

[0070] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0071] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions, characterized in that: It comprises a bearing body (6), a thrust fixed pad (1) and a radial tilting pad, wherein the bearing body (6) comprises a radial part and a thrust part; The thrust fixed pad (1) is fixedly mounted at one end of the thrust portion along the circumferential direction, and the radial tilting pad is arranged inside the radial portion along the circumferential direction; The thrust fixing pad (1) is provided with a cavity structure on one side for forming a friction pair, for forming an oil film. The radial tilting pad comprises a load-bearing radial tilting pad (3) and an unload-bearing radial tilting pad (2). The load-bearing radial tilting pad (3) is provided with micro-textures.

2. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 1, characterized in that: The load-bearing radial tilting pad (3) is located at a position in the direction in which the radial part of the bearing bears the load, and the unloaded radial tilting pad (2) is located at a position in the opposite direction in which the radial part of the bearing bears the load; The inner side surface of the unloaded radial tilting pad (2) is a smooth curved surface.

3. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 1, characterized in that: The cavity structure of the thrust fixing pad (1) includes a step type, a slope type, a step pocket type or a slope pocket type; The bottom surface of the cavity structure is recessed relative to the friction surface of the thrust fixing pad (1), and oil enters the friction pair from the side opening of the cavity structure to form an oil film.

4. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 1, characterized in that: The micro texture on the load-bearing radial tilting pad (3) comprises a cylindrical depression, a hemispherical depression, a conical depression or a prism depression.

5. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 1, characterized in that: The distribution mode of the micro-texture on the load-bearing radial tilting pad (3) includes uniform array distribution, axial non-uniform array distribution, circumferential non-uniform array arrangement and annular arrangement; In the axial non-uniform array distribution, a plurality of micro-textures form a plurality of rows along the axial direction, and the plurality of rows of micro-textures are non-uniformly distributed on the inner side of the load-bearing radial tilting pad (3); In the circumferential non-uniform array arrangement, a plurality of micro-textures form a plurality of rows along the circumferential direction, and the plurality of rows of micro-textures are non-uniformly distributed on the inner side of the load-bearing radial tilting pad (3).

6. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 1, characterized in that: The radial tilting pad is movably arranged inside the radial part along the circumferential direction; An oil injection screw (5) is arranged at the gap between adjacent radial tilting pads. The oil injection screw (5) is fixedly installed on the inner side of the radial part and is used to limit the radial tilting pad.

7. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 1, characterized in that: The thrust fixing pads (1) are evenly arranged along the circumferential direction, and a limiting screw (4) is arranged at the gap between adjacent thrust fixing pads (1), and the limiting screw (4) is fixedly installed at one end of the thrust part.

8. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 6, characterized in that: An oil inlet passage corresponding to the oil injection screw (5) is arranged on the radial portion along the circumferential direction, and the oil injection screw (5) is arranged in the oil inlet passage.

9. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 7, characterized in that: An oil supply groove is provided on the side of the thrust portion.

10. The adaptive radial-thrust integrated bearing suitable for high-speed and heavy-load conditions according to claim 1, characterized in that: The radial part and the thrust part are coaxially assembled via a fixing member (7).

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