Coaxial seat type sliding bearing

Abstract

The invention discloses a coaxial seat type sliding bearing, and belongs to the field of rotating motors. The coaxial seat type sliding bearing comprises a bearing seat used for supporting and fixing a bearing ring; the bearing ring is mounted in the bearing seat, and the inner surface of the bearing ring is a spherical cambered surface; the sliding bearing is arranged in the bearing ring and is used for supporting the rotor; and the ball cambered surface cushion block is arranged between the sliding bearing and the bearing ring, and the surface of the ball cambered surface cushion block is in contact with the ball cambered surface of the bearing ring so as to realize the coaxiality of the sliding bearing and the axis of the rotor and the alignment of the sliding bearing and the axis of the rotor, so that the stability and the reliability of operation are ensured.

Description

Technical Field

[0001] The invention belongs to the field of rotating electrical machines, in particular to a coaxial seat type sliding bearing. Background Art

[0002] Rotating electrical machines, especially large and medium-sized ones, face problems such as axial vibration, shaft current, and vibration caused by foundation settlement during operation, which seriously affect the stability and service life of the equipment. First of all, the axial vibration of rotating electrical machines is one of the main factors affecting the operating efficiency of the equipment. Due to the large deadweight of the main body between the two supporting bearings, the generator rotor will cause static bending of the rotor axis. In addition, the dynamic bending caused by the change of the rotor vibration mode will further aggravate this problem. When the rotor axis is bent, an angle is formed between it and the center line of the bearing, resulting in the inability of the rotor and the sliding bearing to maintain a coaxial state. During the rotation of the rotor, this angle causes the rotor to generate axial alternating thrust, imposes periodic loads on the bearings, and causes severe axial vibration. This vibration will not only accelerate the fatigue damage of the generator structure and civil foundation, but also cause harmful contact and friction between axial small clearance components, thereby threatening the long-term reliability of the equipment.

[0003] On the other hand, the shaft current problem of rotating motors is becoming increasingly prominent as motors become larger. During high-load operation, the rotation of the rotor and the friction of the air gap will generate static charges. At the same time, the asymmetric magnetic circuit, the unipolar effect and the common-mode voltage generated by the excitation system act together on the rotor shaft, resulting in the accumulation of shaft voltage. When the value of the shaft voltage is high enough, it will break through the lubricating oil film of the sliding bearing, forming a shaft current loop from the rotor to the seat bearings at both ends. The shaft current has a direct impact on the deterioration of the lubricating oil, which will cause poor lubrication, thereby accelerating the wear of the components and significantly increasing the friction energy consumption. In addition, the electrical corrosion caused by the shaft current on the rotor and bearing mating surface will cause the key components of the equipment to fail. In severe cases, this current may even cause the rotor or bearing of the rotating motor to be scrapped, resulting in stagnation of equipment operation and increased maintenance costs.

[0004] For medium and large rotating electrical machines, the deadweight of the equipment is relatively large, and its operation inevitably has a long-term effect on the civil engineering foundation. Since the bearing capacity of the foundation often varies from region to region, the vibration and deadweight of the equipment during operation will cause uneven settlement of the foundation. The foundation settlement problem further causes misalignment of the unit shaft system, aggravates the vibration of the rotating parts, and even causes vibration to exceed the standard. This not only affects the safety of the unit operation, but also poses a huge hidden danger to the service life of the equipment. Summary of the invention

[0005] In order to solve the problem that the rotor axis is prone to static bending, the present invention provides a coaxial seat type sliding bearing.

[0006] The present invention is achieved through the following technical solutions: A coaxial seat type sliding bearing, comprising: A bearing seat, used to support and fix the bearing ring; The bearing ring is installed in the bearing seat and the inner surface of the bearing ring is a spherical arc surface; A sliding bearing, which is installed in the bearing ring to support the rotor; The spherical arc surface pad is arranged between the sliding bearing and the bearing ring, and the surface of the spherical arc surface pad is in contact with the spherical arc surface of the bearing ring to achieve the coaxiality of the sliding bearing and the rotor axis.

[0007] A further improvement of the present invention is that the bearing seat includes an upper bearing seat and a lower bearing seat; the upper bearing seat and the lower bearing seat are connected by a first bolt.

[0008] A further improvement of the present invention is that the bearing ring is placed in a groove in the bearing seat, the bearing ring includes an upper bearing ring and a lower bearing ring, the upper half of the bearing ring is fixed in the upper bearing seat by two insulating bolts, and a first insulating layer is arranged between the bearing ring and the bearing seat.

[0009] A further improvement of the present invention is that the sliding bearing comprises an upper sliding bearing and a lower sliding bearing, and the upper sliding bearing and the lower sliding bearing are connected into a whole by a second pair of bolts.

[0010] A further improvement of the present invention is that the spherical arc surface pads include integral spherical arc surface pads installed at the top and bottom of the sliding bearing, and intermediate half-spherical arc surface pads installed at both horizontal sides of the sliding bearing.

[0011] A further improvement of the present invention is that a second insulating layer is provided between the sliding bearing and the spherical arc surface pad.

[0012] A further improvement of the present invention is that lubricating oil inlet holes are provided on both horizontal sides of the sliding bearing and the middle half-spherical arc surface pad.

[0013] A further improvement of the present invention is that the bottom plate of the lower bearing seat is fixed to the civil construction foundation surface by an anchor bolt assembly.

[0014] A further improvement of the present invention is that the anchor bolt assembly includes an anchor bolt, a washer and a nut, and the nut cooperates with the anchor bolt and fixes the washer between the nut and the lower bearing seat.

[0015] A further improvement of the present invention is that an adjusting screw is arranged around the anchor bolt, the adjusting screw is connected to the bottom plate of the lower bearing seat through a thread and adjusts the center height of the sliding bearing through a washer.

[0016] From the above technical solutions, it can be seen that the beneficial effects of the present invention are: it solves a series of problems such as vibration, component damage and unstable operation caused by axis deviation in rotating equipment from the structural and functional aspects. Through the reasonable combination of core components, the automatic alignment of the sliding bearing and the rotor axis is achieved, ensuring the stability and reliability of the system under various operating conditions.

[0017] The spherical arc surface pad in the bearing contacts the inner spherical arc surface of the bearing ring and utilizes the elastic adjustment characteristics of the sliding bearing to enable the sliding bearing to adapt to the changes of the rotor axis in static and dynamic conditions, automatically adjust its position to maintain coaxiality, and effectively eliminate the angle between the rotor axis and the bearing axis. This fundamentally solves the problem of axial alternating thrust caused by axis deviation during the operation of the rotating motor, greatly reduces the vibration of the bearing and related components, and reduces the resulting component loss and equipment failure.

[0018] At the same time, the design significantly improves the operating stability of the equipment and extends the service life of key components by reducing the impact of axial vibration on the sliding bearing and rotor. Especially in high-load, high-precision industrial scenarios, the automatic coaxial function provided by this technical solution can greatly reduce the system's dependence on human intervention, ensuring that the equipment can maintain an efficient and stable state under complex operating conditions.

[0019] In order to further improve the convenience of installation and maintenance, the modular design of the sliding bearing is combined with the spherical arc surface contact structure, so that the installation of the equipment does not require complicated alignment operations, while reducing the difficulty of adjustment during maintenance. It not only reduces the maintenance workload and cost, but also improves the adaptability of the equipment, making it suitable for large, medium and small rotating motors and other types of high-precision rotating equipment.

[0020] In addition, the present invention can dynamically adapt to the changes in the rotor axis under various working conditions, and can maintain the coaxial state of the system without additional adjustment devices, effectively avoiding problems such as increased vibration, component wear and system imbalance, thereby providing reliable guarantee for the long-term stable operation of the equipment. Thanks to its highly integrated design concept, this technical solution is not only highly innovative in functional realization, but also shows outstanding economy and practicality in manufacturing, installation, maintenance and other links, and is widely applicable to various types of rotating equipment that require high reliability and low vibration. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the installation structure of a specific implementation mode of the present invention.

[0022] Figure 2 It is a schematic cross-sectional structure diagram of a specific implementation mode of the present invention.

[0023] Figure 3 It is a schematic structural diagram of an anchor bolt assembly according to a specific embodiment of the present invention.

[0024] In the attached drawings: 1.1, upper bearing seat; 1.2, lower bearing seat; 2.1, upper bearing ring; 2.2, lower bearing ring; 3.1, integral spherical arc surface pad; 3.2, middle half spherical arc surface pad; 4.1, upper bearing; 4.2, lower bearing; 5.1, first insulating layer; 5.2, second insulating layer; 6, civil engineering foundation surface; 7, insulating bolt; 8, first closing bolt; 9, anchor bolt; 10, washer; 11, nut; 12, adjustment screw; 13, second closing bolt; 14, shim. DETAILED DESCRIPTION

[0025] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0026] like Figure 1-3 As shown, the present invention discloses an automatic coaxial built-in double-layer insulation adjustable center height seat type sliding bearing, including a bearing seat, a bearing ring, a spherical arc surface pad, a sliding bearing, an insulating layer, a civil engineering foundation surface 6, an insulating bolt 7, a first combination bolt 8, an anchor bolt 9, a washer 10, a nut 11, an adjustment screw 12, a second combination bolt 13 and a shim 14.

[0027] Specifically, the bearing seat comprises an upper bearing seat 1.1 and a lower bearing seat 1.2, and the upper bearing seat 1.1 and the lower bearing seat 1.2 are fastened together into a whole by two first bolts 8.

[0028] The inner surface of the bearing ring is a smooth spherical arc surface. The bearing ring includes an upper bearing ring 2.1 and a lower bearing ring 2.2. When in use, the bearing ring is assembled in a groove machined in the bearing seat. A first insulating layer 5.1 is arranged between the bearing ring and the bearing seat. The first insulating layer 5.1 is a hard insulating plate 5.1 with high mechanical strength. The upper half of the bearing ring is fixed in the upper bearing seat 1.1 by two insulating bolts 7.

[0029] The spherical arc surface pads include integral spherical arc surface pads 3.1 installed at the top and bottom of the sliding bearing, and intermediate half-spherical arc surface pads 3.2 installed at both horizontal sides of the sliding bearing.

[0030] The sliding bearing comprises an upper half bearing 4.1 and a lower half bearing 4.2. When in use, the upper half bearing 4.1 and the lower half bearing 4.2 are fastened and connected into a whole by four second bolts 13. Two integral spherical arc surface pads 3.1 and two intermediate half spherical arc surface pads 3.2 are fixed on the sliding bearing by four insulating bolts, wherein. The integral spherical arc surface pads 3.1 are installed at the top and bottom of the sliding bearing, and the intermediate half spherical arc surface pads 3.2 are installed on the horizontal sides of the sliding bearing. Lubricating oil inlet holes are reserved on the intermediate half spherical arc surface pads 3.2. Similarly, lubricating oil inlet holes are reserved at corresponding positions on the horizontal sides of the sliding bearing. A second insulating layer 5.2 is arranged between the four spherical arc surface pads and the sliding bearing. The second insulating layer 5.2 is a hard insulating plate with high mechanical strength. The surfaces of the four spherical arc surface pads fixed on the sliding bearing are smooth spherical arc surfaces, which are in contact with the inner spherical arc surface of the bearing ring and are coated with grease.

[0031] The seat type sliding bearing is fixed on the civil engineering foundation surface 6 by four anchor bolt assemblies on the lower bottom plate of the bearing seat. The anchor bolt assembly includes an anchor bolt 9, a washer 10 and a nut 11. The nut 11 cooperates with the anchor bolt 9 and fixes the washer 10 between the nut 11 and the lower bearing seat 1.2. Three adjustment screws 12 are arranged around each anchor bolt assembly. The adjustment screw 12 is connected to the bottom plate of the lower bearing seat 1.2 through a thread. The lower part of the adjustment screw 12 is pressed against the upper part of the washer 14 laid on the civil engineering foundation surface 6. The adjustment screw 12 can adjust the center height of the seat type sliding bearing as needed. After adjustment, the seat type sliding bearing is fixed to the civil engineering foundation through the anchor bolt assembly.

[0032] It can be seen from the above scheme that the low-friction spherical arc contact surface of the spherical arc inner surface of the integral spherical arc surface pad 3.1, the middle half spherical arc surface pad 3.2, the upper bearing ring 2.1 and the lower bearing ring 2.2 is used to achieve that when the motor rotor axis is statically or dynamically bent, the sliding bearing automatically achieves coaxiality with the bent rotor under the action of the torsional torque formed by the bending of the shaft centerline on the sliding bearing.

[0033] The shaft current loop is cut off by arranging the first insulating layer 5.1 and the second insulating layer 5.2, thereby eliminating the harm of the bearing current.

[0034] The center height of the seat bearing is adjusted by adjusting screw 12 to align the entire shaft system and eliminate the vibration aggravation and vibration exceeding the standard caused by the settlement of the civil foundation.

[0035] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coaxial seat type sliding bearing, characterized in that: include: A bearing seat, used to support and fix the bearing ring; The bearing ring is installed in the bearing seat and the inner surface of the bearing ring is a spherical arc surface; A sliding bearing, which is installed in the bearing ring to support the rotor; The spherical arc surface pad is arranged between the sliding bearing and the bearing ring, and the surface of the spherical arc surface pad is in contact with the spherical arc surface of the bearing ring to achieve the coaxiality of the sliding bearing and the rotor axis.

2. The coaxial seat type sliding bearing according to claim 1, characterized in that: The bearing seat comprises an upper bearing seat (1.1) and a lower bearing seat (1.2); the upper bearing seat (1.1) and the lower bearing seat (1.2) are connected via a first bolt (8).

3. The coaxial seat type sliding bearing according to claim 1, characterized in that: The bearing ring is placed in a groove in the bearing seat, and the bearing ring comprises an upper bearing ring (2.1) and a lower bearing ring (2.2). The upper half of the bearing ring is fixed in the upper bearing seat (1.1) by two insulating bolts (7), and a first insulating layer (5.1) is provided between the bearing ring and the bearing seat.

4. The coaxial seat type sliding bearing according to claim 1, characterized in that: The sliding bearing comprises an upper sliding bearing (4.1) and a lower sliding bearing (4.2), and the upper sliding bearing (4.1) and the lower sliding bearing (4.2) are connected into a whole via a second bolt (13).

5. The coaxial seat type sliding bearing according to claim 1, characterized in that: The spherical arc surface pads include integral spherical arc surface pads (3.1) installed at the top and bottom of the sliding bearing, and intermediate half-spherical arc surface pads (3.2) installed at both horizontal sides of the sliding bearing.

6. The coaxial seat type sliding bearing according to claim 1, characterized in that: A second insulating layer (5.2) is provided between the sliding bearing and the spherical arc surface pad.

7. The coaxial seat type sliding bearing according to claim 5, characterized in that: Lubricating oil inlet holes are provided on the horizontal sides of the sliding bearing and the middle half-spherical arc surface pad (3.2).

8. The coaxial seat type sliding bearing according to claim 2, characterized in that: The bottom plate of the lower bearing seat (1.2) is fixed on the civil engineering foundation surface (6) by means of an anchor bolt assembly.

9. The coaxial seat type sliding bearing according to claim 8, characterized in that: The anchor bolt assembly comprises an anchor bolt (9), a washer (10) and a nut (11); the nut (11) cooperates with the anchor bolt (9) and fixes the washer (10) between the nut (11) and the lower bearing seat (1.2).

10. The coaxial seat type sliding bearing according to claim 9, characterized in that: An adjustment screw (12) is arranged around the anchor bolt (9), and the adjustment screw (12) is connected to the bottom plate of the lower bearing seat (1.2) through a thread and adjusts the center height of the sliding bearing through a washer (14).

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