A tilting pad support bearing for a speed increasing gearbox

Abstract

The invention discloses a tilting pad support bearing for a speed increasing gearbox, which belongs to the technical field of bearing design. The bearing comprises a bearing housing, a tilting pad, a pad back limit screw, an oil injection screw, a sealing end cover A, a sealing end cover B, an end cover fastening screw, a pad end face limit screw, a temperature measuring wire clamp, a wire clamp fastening screw and a flange. The sealing end cover A and the sealing end cover B are mounted at two ends of the bearing housing, the tilting pad is arranged in the bearing housing, the oil injection screw and the pad back limit screw are respectively arranged on the side wall of the bearing housing, the end cover fastening screws are respectively arranged on the sealing end cover A and the sealing end cover B, the pad end face limit screws are respectively installed between the sealing end cover A, the sealing end cover B and the tilting pad, the flange, the temperature measuring wire clamp and the wire clamp fastening screw are arranged on the sealing end cover B. The bearing has reasonable structural design, convenient processing, installation and maintenance, low power consumption, safety and reliability, and long service life.

Description

Technical Field

[0001] The invention relates to the technical field of bearing design, in particular to a tilting pad support bearing for a speed increasing gear box. Background Art

[0002] As a speed and energy transmission device, gearbox is an indispensable equipment in engineering machinery. The rated speed of the speed increasing gearbox is very high, and the maximum speed will reach 80000rpm. Due to the functional characteristics of the gearbox, the stability and reliability of the sliding bearing are very high. The tilting pad radial bearing is the most stable bearing form, usually composed of multiple tilting pads cast with babbitt alloy. The tilting pad can automatically adjust the pad inclination with the change of load and speed, forming multiple oil wedges and dynamic pressure oil films. The back of each pad is in line contact with the bearing body, and the oil film gap can be swung to adjust the oil film gap during operation. Therefore, the tilting pad bearing has good vibration reduction performance and is mainly used in high-speed and light-load equipment such as steam turbines, compressors, turbine equipment, pumps, etc. The tilting pad bearing has increased support flexibility and has the ability to absorb vibration because the pad can swing freely, that is, it has good shock absorption.

[0003] However, there are some problems with the existing fluid-supported tilting pad bearings. For example, a fluid-supported tilting pad sliding bearing with publication number CN105351359A includes a bearing housing, a bearing pad is installed on the inner surface of the bearing housing, and the two sides of the bearing pad are connected to the bearing end cover. The mechanical shaft passes through the through hole of the bearing pad to form an interference fit, and the two ends are installed in the strip holes on the bearing end cover to allow the bearing pad to float radially. An oil supply groove is opened on the outer surface of the bearing housing, and an oil supply conduit is provided on the bearing housing and the bearing pad. An oil groove is provided on the inner surface of the bearing pad, and the oil supply groove is connected to the oil groove through the oil supply conduit. The bearing pad is provided with a central small hole, and a static pressure cavity is provided on the outer surface of the bearing pad. The static pressure cavity connects the dynamic pressure oil film area generated by the wedge-shaped convergence gap formed between the shaft neck and the inner surface of the bearing pad through the central small hole. An oil drain groove is provided on the bearing end cover, and the oil drain groove allows the lubricating oil in the bearing to drain to the outside of the bearing through the groove. The present invention can reduce the dependence of the bearing on the external high oil supply pressure, and is convenient for assembly and monitoring of the pad status.

[0004] The bearing has the following disadvantages:

[0005] First, in order to ensure the installation concentricity of the two supporting bearings of the rotor, the requirements for the installation size and shape and position tolerance of the bearings are usually high, the processing is difficult, and it is not convenient for production.

[0006] Secondly, the adaptive centering function of the radial pad cannot be realized and it is sensitive to the misalignment and runout of the rotor, which can easily cause the bearing temperature to rise, the friction power consumption to be large, and the inability to establish a complete oil film, resulting in abnormal vibration.

[0007] Third, there are no temperature measuring holes and temperature measuring elements, so the temperature rise inside the bearing cannot be detected. Under continuous high-speed operation, the bearing blocks are easily burned.

[0008] Fourth, there is no mounting frame for fixing the wires, which results in the wires that may be used not being fixed and causing interference with the installation. Summary of the invention

[0009] The object of the present invention is to provide a tilting pad support bearing for a speed increasing gearbox, so as to solve the technical problems in the prior art of high processing difficulty, non-adaptive adjustment and inability to detect internal temperature.

[0010] The present invention provides a tilting pad support bearing for a speed-increasing gearbox. The bearing adopts an asymmetric five-pad tilting pad structure, comprising a bearing housing, a tilting pad, a pad back limit screw, an oil injection screw, a sealing end cover A, a sealing end cover B, an end cover fastening screw, a pad end face limit screw, a temperature measuring wire clamp, a wire clamp fastening screw and a flange. The sealing end cover A and the sealing end cover B are installed at both ends of the bearing housing, the tilting pad is arranged in the bearing housing, the oil injection screw and the pad back limit screw are respectively arranged on the side walls of the bearing housing, the end cover fastening screws are respectively arranged on the sealing end cover A and the sealing end cover B, the pad end face limit screws are respectively installed between the sealing end cover A, the sealing end cover B and the tilting pad, and the flange, the temperature measuring wire clamp and the wire clamp fastening screw are arranged on the sealing end cover B.

[0011] Furthermore, the A end of the bearing housing is smaller than the disk surface of the B end, the flange sleeve is installed on the B surface end of the bearing housing and the bottom surface is flush with the B surface end of the bearing housing, five tilting pads are installed on the inner surface of the bearing housing, and two temperature measuring holes are respectively provided on the two end surfaces of two tilting pads, the cross-section of the inner wall surface of the bearing housing is arc-shaped, and the radial tilting pads are limited by the combination of the injection screws limited on both sides and the pad back limit screws, and the two adjacent injection screws penetrate the side wall of the bearing housing and extend from the outside to the inside to clamp the tilting pads On both sides, the pad back limit screw penetrates the side wall of the bearing housing and extends from the outside to the inside to press against the back of the tilting pad. The oil injection screw penetrates the bearing housing. The oil injection screw is a screw structure with an oil injection nozzle. The oil injection screw is supplied with oil from the outside and directly sprays into the inner side of the tilting pad and the oil inlet edge of the gearbox rotor. The arcuate inner wall of the bearing housing and the radial back of the tilting pad form a point contact bearing under the resistance of the pad back limit screw. The bearing housing and the tilting pad are made of high-strength alloy steel and are tempered and normalized.

[0012] Furthermore, the sealing end cover A and the sealing end cover B are respectively fixed to the A-face end and the B-face end of the bearing housing by a plurality of end cover fastening screws, the inner sides of the sealing end cover A and the sealing end cover B and the corresponding positions on the bearing housing are provided with pin holes, a plurality of shoe end face limiting screws fix and limit the sealing end cover A and the sealing end cover B to the bearing housing respectively, an outer cylinder is provided outside the bearing housing, and the outer cylinder is clearance-fitted with the bearing housing.

[0013] Furthermore, the sealing end cover A and the sealing end cover B are respectively provided with two temperature measuring holes corresponding to the temperature measuring points on the internal tilting pad, and the outer sides of the sealing end cover A and the sealing end cover B are respectively provided with a plurality of oil outlet holes, and the flange is installed with three temperature measuring wire clamps through the hexagon socket flat head screws, and the temperature measuring wire clamps are open nose-shaped structures.

[0014] Furthermore, the bearing housing adopts an integral structure.

[0015] Furthermore, the tilting pad base may also be made of copper alloy material, and a spherical support structure may be added to the pad back.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] First, in order to ensure the installation concentricity of the two supporting bearings of the rotor, the existing bearings usually have high requirements on the bearing installation size and shape and position tolerances. However, this bearing adopts an integral structure, relying on the installation clearance fit and the misalignment compensation structure of the pad to reduce the processing difficulty.

[0018] Secondly, the existing bearings cannot realize the adaptive centering function of the radial pads and are sensitive to the misalignment and deflection of the rotor, which easily causes the bearing temperature to rise, the friction power consumption to be large, and the inability to establish a complete oil film to cause abnormal vibration. The radial pads of this bearing and the bearing housing are point-supported free deflection movable structures. The pad supports are all point supports, and the pads can be adjusted to deflect in all directions. The pads can be adaptively adjusted transiently according to the working conditions to meet the working conditions, compensate for the misalignment and deflection of the rotor caused by the improper installation of the bearing and the rotor processing error, and improve the high-speed stability performance of the bearing.

[0019] Thirdly, both radial and thrust bearings are lubrication structures that directly spray oil through injection screws, which greatly reduces the proportion of mixed oil and allows cold oil to directly enter the lubrication surface. This oil inlet lubrication method can reduce the mixing of hot oil during use, greatly reduce the lubrication temperature rise of the oil film, reduce power consumption, and improve lubrication performance.

[0020] Fourthly, the existing technology cannot measure the temperature inside the bearing, which may lead to the risk of excessive internal temperature and high friction power consumption. However, the present bearing can measure the temperature inside the bearing by setting temperature measuring points and temperature measuring wire clamps, make timely adjustments, and protect the entire bearing from damage by high temperature. At the same time, the wires are fixed and the outlet position is limited to prevent wire interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 It is a front view of the sealing end cover A surface of the present invention;

[0024] Figure 3 for Figure 2 Sectional view along line CC;

[0025] Figure 4 for Figure 2 Sectional view along line DD;

[0026] Figure 5 It is a front view of the sealing end cover B surface of the present invention;

[0027] Figure 6 for Figure 2 Disassembly diagram with sealing end cover A removed.

[0028] Figure numerals: bearing housing 1, tilting pad 2, pad end face limit screw 3, pad back limit screw 4, sealing end cover A5, sealing end cover B6, oil injection screw 7, end cover fastening screw 8, temperature measuring wire clamp 9, wire clamp fastening screw 10, flange 11, pin hole 12, temperature measuring through hole 13, temperature measuring point 14, oil outlet hole 15, outer cylinder 16. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0031] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Combine the following Figures 1 to 6As shown, an embodiment of the present invention provides a tilting pad support bearing for a speed increasing gearbox. The bearing adopts an asymmetric five-pad tilting pad structure, including a bearing housing 1, a tilting pad 2, a pad back limit screw 4, a sealing end cover A5, a sealing end cover B6, an oil injection screw 7, an end cover fastening screw 8, a wire clamp fastening screw 10, a pad end face limit screw 3, a wire clamp fastening screw 10 and a flange 11. The flange 11 is sleeved and installed on the B surface end of the bearing housing 1 and the bottom surface is flush with the B surface end of the bearing housing 1. Five tilting pads 2 are installed on the inner surface of the bearing housing 1, so that all the tilting pads can be 2 can be more evenly distributed, wherein two temperature measuring through holes 13 are respectively provided on the two end surfaces of the two tilting pads 2, so as to facilitate the temperature measurement inside the bearing. The cross section of the inner wall surface of the bearing housing 1 is arc-shaped, and the radial tilting pad 2 is limited by the combination of the oil injection screws 7 and the pad back limiting screws 4 on both sides. The two adjacent oil injection screws 7 that limit the position penetrate the side wall of the bearing housing 1 and extend from the outside to the inside to clamp the two sides of the tilting pad 2 to prevent the tilting pad 2 from rotating. The pad back limiting screws 4 penetrate the side wall of the bearing housing 1 and extend from the outside to the inside to press against the back of the tilting pad 2 to prevent the tilting pad 2 from rotating excessively. The process is too intense, resulting in a violent collision between the tilting pad 2 and the inner wall of the bearing housing 1, thereby accelerating the wear of the tilting pad 2. The bearing housing 1 is penetrated by the injection screw 7, and the injection screw is a screw structure with an oil spray nozzle. The injection screw 7 is supplied with oil from the outside and directly sprayed into the oil inlet edge of the inner side of the tilting pad 2 and the gearbox rotor, so that the entire bearing can be filled with lubricating oil, the entire bearing interior can be cooled, and at the same time, the smoothness can be increased and the wear of parts can be reduced. In addition, this direct injection oil inlet lubrication method can reduce the mixing of hot oil during use and greatly reduce the proportion of mixed oil, so that cold oil can be To directly enter the lubrication surface, reduce temperature rise and power consumption. Since the arc-shaped inner wall of the bearing housing 1 and the radial back of the tilting pad 2 form a point contact load under the resistance of the pad back limit screw 4, the tilting pad 2 can achieve slight axial and axial swings, which can leave a little space, making it easier for the lubricating oil to penetrate between the inner wall of the bearing housing 1 and the back of the tilting pad 2, and also facilitate the discharge of impurities to the upper and lower ends, reduce the temperature of parts, reduce friction, and save energy. The bearing housing 1 and the tilting pad 2 are made of high-strength alloy steel and are tempered and normalized to improve the hardness and toughness of the material.

[0035] The sealing end cover A5 and the sealing end cover B6 are respectively fixed to the A surface end and the B surface end of the bearing housing 1 by a plurality of the end cover fastening screws 8 to prevent them from falling off. At the same time, the inner sides of the sealing end cover A5 and the sealing end cover B6 and the corresponding positions on the bearing housing 1 are provided with pin holes 12, and a plurality of the tile end face limiting screws 3 fix the sealing end cover A5 and the sealing end cover B6 to the bearing housing 1 respectively to prevent the bearing from falling off during operation, and facilitate the quick finding of the sealing end cover A5, the sealing end cover B6 and the bearing housing 1 during installation and repair. The bearing housing 1 has a fixed position relationship and is quickly positioned, which improves the speed and accuracy of installation and prevents the occurrence of misaligned holes. The bearing housing 1 is provided with an outer cylinder 16, and the outer cylinder 16 and the bearing housing 1 are clearance-matched, which is convenient for integral installation. In actual use of the bearing housing 1, the radial tilting pad 2 and the thrust tilting pad 2 are adaptively adjusted according to the rotational speed and load as well as the machining and assembly errors of the unit, so that the load distribution is more uniform and the adjustment is flexible. It can compensate for the misalignment and deflection of the rotor caused by machining errors and installation errors, and improve the high-speed stability performance of the bearing.

[0036] The sealing end cover A5 and the sealing end cover B6 are installed at both ends of the bearing housing 1, and a certain sealing gap is designed to ensure that the hot oil flows out for heat exchange, and two temperature measuring points 14 corresponding to the temperature measuring through holes 13 on the internal tilting pad 2 are respectively provided on the sealing end cover A5 and the sealing end cover B6 to facilitate the collection of temperature data. A plurality of oil outlet holes 15 are respectively provided on the outer sides of the sealing end cover A5 and the sealing end cover B6. Three temperature measuring wire clamps 9 are installed on the flange 11 through the hexagon socket flat head screws. The temperature measuring wire clamp 9 is an open nose-shaped structure. The temperature measuring wire clamp 9 is used for routing the temperature measuring element to prevent interference with the installation of the wires.

[0037] The bearing housing 1 adopts an integral structure, and relies on installation clearance fit and misalignment compensation of the tilting pad 2 to reduce the difficulty of processing.

[0038] The base of the tilting pad 2 may also be made of copper alloy material to improve the thermal conductivity and reduce the temperature of the pad surface. A spherical support structure may also be added to the pad back to achieve the axial and axial deflection functions of the pad.

[0039] Principle of the present invention: the sealing end cover A5, the sealing end cover B6 and the bearing housing 1 form a sealed area, and the interior is filled with lubricating oil through the injection screw 7 of the oil injection screw 7 under the oil supply pressure of the oil supply system. When the bearing housing 1 starts to rotate, the lubricating oil is brought between the inner wall of the bearing housing 1 and the back of the tilting pad 2. The radial back of the tilting pad 2 can be freely deflected and supported by the inner wall of the bearing housing 1 with the back limit screw 4 as a point support. In the gap when the tilting pad 2 realizes axial and axial small swings, the tilting pad 2 can adaptively adjust transiently according to the working conditions to meet the working conditions and form a dynamic pressure oil film. When the equipment reaches a high speed, the direction of the temperature measuring clamp 9 can be adjusted, and the temperature data is collected in the temperature measuring point 14 through the temperature measuring element. The data is analyzed and the temperature in the bearing is timely regulated.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tilting pad support bearing for a speed increasing gearbox, characterized in that: The invention comprises a bearing housing (1), a tilting pad (2), a pad back limit screw (4), an oil injection screw (7), a sealing end cover A (5), a sealing end cover B (6), an end cover fastening screw (8), a pad end face limit screw (3), a temperature measuring wire clamp (9), a wire clamp fastening screw (10) and a flange (11), wherein the sealing end cover A (5) and the sealing end cover B (6) are mounted at two ends of the bearing housing (1), the tilting pad (2) is arranged in the bearing housing (1), the oil injection screw (7) and the pad back limit screw (4) are respectively arranged on the side wall of the bearing housing (1), the end cover fastening screw (8) is respectively arranged on the sealing end cover A (5) and the sealing end cover B (6), and the pad end face limit screw (3) is mounted on the bearing housing (1). The positioning screws (3) are respectively installed between the sealing end cover A (5), the sealing end cover B (6) and the tilting pad (2); the flange (11), the temperature measuring wire clamp (9) and the wire clamp fastening screws (10) are arranged on the sealing end cover B (6); the flange (11) is sleeved and installed on the B surface end of the bearing housing (1) and the bottom surface is flush with the B surface end of the bearing housing (1); five tilting pads (2) are installed on the inner surface of the bearing housing (1), and two of the two end surfaces of the tilting pads (2) are respectively provided with two temperature measuring through holes (13); the inner wall surface of the bearing housing (1) is arc-shaped in cross section, and the radial tilting pad (2) is limited by the injection screws (7) on both sides and the pad back limit screws (4) Combined limiting, two adjacent oil injection screws (7) penetrate the side wall of the bearing housing (1) and extend from the outside to the inside to clamp the two sides of the tilting pad (2), the pad back limiting screw (4) penetrates the side wall of the bearing housing (1) and extends from the outside to the inside to abut against the back of the tilting pad (2), the bearing housing (1) is penetrated by the oil injection screw (7), the oil injection screw (7) is a screw structure with an oil injection nozzle, the oil injection screw (7) is supplied with oil from the outside and directly sprays into the inner side of the tilting pad (2) and the oil inlet edge of the gearbox rotor, the arc-shaped inner wall of the bearing housing (1) and the radial back of the tilting pad (2) form a point contact bearing under the abutment of the pad back limiting screw (4), the bearing housing (1) The body (1) and the tilting pad (2) are made of high-strength alloy steel and are subjected to quenching and normalizing treatment; the sealing end cover A (5) and the sealing end cover B (6) are respectively fixed to the A surface end and the B surface end of the bearing housing (1) by a plurality of the end cover fastening screws (8); the inner sides of the sealing end cover A (5) and the sealing end cover B (6) and the corresponding positions on the bearing housing (1) are provided with pin holes (12); a plurality of the pad end face limiting screws (3) respectively fix the sealing end cover A (5) and the sealing end cover B (6) to the bearing housing (1); an outer cylinder (16) is provided outside the bearing housing (1); the outer cylinder (16) and the bearing housing (1) are clearance-fitted;The sealing end cover A (5) and the sealing end cover B (6) are respectively provided with two temperature measuring through holes (13) corresponding to the temperature measuring points (14) on the internal tilting pad (2); the sealing end cover A (5) and the sealing end cover B (6) are respectively provided with a plurality of oil outlet holes (15) on the outside; the flange (11) is provided with three temperature measuring wire clamps (9) by means of hexagon socket flat head screws; the temperature measuring wire clamps (9) are of an open nose-shaped structure; the bearing housing (1) is of an integral structure. ; 2. The tilting pad support bearing for a speed increasing gearbox according to claim 1, characterized in that: The base of the tilting pad (2) is made of copper alloy material, and a spherical support structure is added to the back of the pad.

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