Magnetic bearing structure for turbomachinery

Abstract

The utility model discloses a magnetic bearing structure for turbomachinery, and belongs to the field of magnetic bearings. The structure comprises a magnetic bearing outer ring, a magnetic bearing inner ring is arranged in an inner cavity of the magnetic bearing outer ring, and a plurality of oil injection holes are symmetrically formed in the top surface and the bottom surface of the magnetic bearing outer ring; a dustproof plate is arranged at the bottom of the magnetic bearing outer ring; a through hole is formed in the center of the dustproof plate in a penetrating mode, and an upward protruding ring is arranged on the dustproof plate around the through hole. A dustproof cover is arranged at the top of the magnetic bearing outer ring, a through hole is formed in the center of the dustproof cover, a plurality of grooves are formed in the dustproof cover around the periphery of the through hole, and a brush is fixedly connected to the bottom surface of the dustproof cover. The structure can solve the technical problems that a rolling shaft column of an existing magnetic bearing is exposed for a long time to adsorb dust, a shell is abraded during rolling, friction force is increased, lubricity can be reduced after long-time use, and finally the bearing is possibly scrapped.

Description

Technical Field

[0001] The utility model belongs to the field of magnetic bearings and relates to a magnetic bearing structure used for turbine machinery. Background Art

[0002] Magnetic bearings are used in a variety of machines, such as pumps, turbines, electric motors, and compressors. In many machines, the rotating shaft is supported mechanically, using ball magnetic bearings, cylindrical magnetic bearings, partially lubricated magnetic bearings, or hydrostatic magnetic bearings. Magnetic bearings are essential components in turbomachinery.

[0003] In existing magnetic bearing designs, the rolling pins are completely exposed to the air. Long-term exposure can lead to a large amount of dust adsorbed on the rolling pins' surfaces. When the dust-laden rolling pins roll inside the housing, they can cause wear and scratches inside the housing, increasing rolling friction. Furthermore, when the magnetic bearings are fitted with components or mounted on magnetic bearing supports, their lubricity deteriorates over time, leading to their failure.

[0004] Although the magnetic bearings in existing turbomachinery use separate dust covers or dust plates for dust protection, these dust prevention measures often lack effective sealing structures and are unable to promptly remove any dust that may adhere. This may still cause trace amounts of dust to enter the interior, and the dust cannot be cleaned promptly. Dust accumulation during long-term use will aggravate the wear of the magnetic bearings, ultimately causing the magnetic bearings to become scrapped.

[0005] Therefore, it is particularly important to improve the existing magnetic bearing structure to enhance its dustproof performance and lubrication retention ability. Utility Model Content

[0006] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present utility model is to provide a magnetic bearing structure for turbomachinery to solve the technical problems that the rolling shaft of the existing magnetic bearing is exposed to dust absorption for a long time, wears the outer shell and increases friction when rolling, and reduces lubricity after long-term use, which may eventually cause the bearing to be scrapped.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] The utility model provides a magnetic bearing structure for a turbomachinery, comprising a magnetic bearing outer ring, a magnetic bearing inner ring being arranged in the inner cavity of the magnetic bearing outer ring, a plurality of oil filling holes being symmetrically provided on the top surface and the bottom surface of the magnetic bearing outer ring; a dustproof plate being provided at the bottom of the magnetic bearing outer ring; a through hole being provided through the center of the dustproof plate, and an upward convex ring being provided on the dustproof plate around the through hole; a dustproof cover being provided at the top of the magnetic bearing outer ring, a through hole being provided at the center of the dustproof cover, a plurality of grooves being provided on the dustproof cover around the periphery of the through hole, and a brush being fixedly connected to the bottom surface of the dustproof cover.

[0009] In one embodiment, the dust cover is threadedly connected to the top end of the inner wall of the outer ring of the magnetic bearing.

[0010] In one embodiment, a retaining frame is provided between the outer ring of the magnetic bearing and the inner ring of the magnetic bearing, and balls are provided inside the retaining frame.

[0011] In one embodiment, a first raceway is provided on one side of the connection between the center of the inner wall of the outer ring of the magnetic bearing and the ball, and a second raceway is provided on one side of the connection between the center of the outer side of the inner ring of the magnetic bearing and the ball; the ball is located between the first raceway and the second raceway.

[0012] In one embodiment, the outlet ends of the oil filling holes are both connected to the first raceway.

[0013] In one embodiment, the oil filling hole is inclined toward the ball, the oil filling hole opened on the top surface of the magnetic bearing outer ring is inclined downward, and the oil filling hole opened on the bottom surface of the magnetic bearing outer ring is inclined upward.

[0014] In one embodiment, several of the oil filling holes are provided with sealing plugs.

[0015] In one embodiment, the outer ring of the inner ring of the magnetic bearing is fixedly connected to a stator, the inner ring of the inner ring of the magnetic bearing is provided with a rotor, and a coil is provided inside the stator.

[0016] In one embodiment, the outer diameter of the dust cover is consistent with the inner diameter of the outer ring of the magnetic bearing, and the diameter of the through hole on the dust cover is consistent with the diameter of the rotor; the diameter of the through hole on the dust plate is consistent with the diameter of the rotor, and the diameter of the dust plate is consistent with the outer diameter of the outer ring of the magnetic bearing.

[0017] In one embodiment, the magnetic bearing outer ring and the magnetic bearing inner ring are magnetic bearing components made of high carbon steel.

[0018] In one embodiment, the surface of the outer ring of the magnetic bearing is sprayed with wear-resistant paint.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The utility model provides a magnetic bearing structure for turbomachinery. A central through-hole in the dust shield allows the rolling shaft to pass through, effectively isolating dust. A raised ring surrounding the through-hole on the dust shield acts as a seal to further block dust. A central through-hole in the dust cover allows the rolling shaft to rotate. A brush mounted on the underside of the dust cover constantly cleans the balls, preventing dust and other impurities from settling on the balls and improving the operating efficiency and service life of the magnetic bearing. The combination of the dust shield and dust cover allows the inner shaft to be completely embedded in a relatively sealed space, effectively isolating most dust from the inner and outer rings and preventing external dust from entering the rotating cage and balls. The raised ring not only further seals against dust, but also removes dust with the brush. The design of the dust shield and dust cover not only enhances the dustproof performance of the bearing but also prevents the lubricating oil from escaping the magnetic bearing, enhancing its dustproof performance and effectively reducing its coefficient of friction. Furthermore, the oil filling holes on the outer ring of the magnetic bearing allow lubrication of the magnetic bearing to be selected based on the actual installation conditions. This combination of sealing and lubricity enables the bearing to maintain a stable lubrication state during long-term use, thereby reducing the scrapping of bearings due to poor lubrication.

[0021] Furthermore, the high mechanical hardness of the magnetic bearing outer and inner rings enables the bearings to maintain good stability and durability even when subjected to heavy loads and high-speed rotation. This high mechanical hardness not only extends the bearing's service life but also improves its overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A perspective view of a magnetic bearing structure for a turbomachinery according to the present invention;

[0023] Figure 2 It is a partial perspective view of a magnetic bearing structure for turbomachinery according to the present invention;

[0024] Figure 3 It is a side sectional view of a magnetic bearing structure for turbomachinery according to the present invention;

[0025] Figure 4 This is a schematic structural diagram of a dust cover in a magnetic bearing structure for a turbomachinery according to the present invention.

[0026] In the figure: 1 - outer ring of magnetic bearing; 2 - inner ring of magnetic bearing; 3 - cage; 4 - ball; 5 - dust-proof plate; 6 - through hole; 7 - convex ring; 8 - dust-proof cover; 9 - external thread; 10 - internal thread; 11 - first raceway; 12 - oil injection hole; 13 - second raceway; 14 - sealing plug; 15 - groove; 16 - brush; 17 - rotor; 18 - stator. Detailed implementation manner

[0027] In order to enable those skilled in the art of this technology to better understand the solution of this utility model, the following will clearly and completely describe the technical solutions in the embodiments of this utility model in conjunction with the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments. Based on the embodiments in this utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this utility model.

[0028] It should be noted that the terms "first", "second", etc. in the description and claims of this utility model and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of this utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0029] The following will further describe this utility model in detail in conjunction with the accompanying drawings:

[0030] See Figure 1 , this utility model provides a magnetic bearing structure for turbomachinery, and this structure includes an outer ring 1 of magnetic bearing, and an inner ring 2 of magnetic bearing is arranged in its inner cavity. In order to achieve the lubrication of the bearing, a plurality of oil injection holes 12 are symmetrically arranged at the top and bottom of the outer ring 1 of magnetic bearing.

[0031] See Figure 2 , at the bottom of the outer ring 1 of magnetic bearing, a dust-proof plate 5 is installed, and a through hole 6 is penetrated through the center position of it. An upward convex ring 7 is arranged around the through hole 6 on the dust-proof plate 5 to enhance the dust-proof effect.

[0032] See Figure 3 and Figure 4, a dust cover 8 is provided at the top of the outer ring 1 of the magnetic bearing. A through hole is provided at the center thereof, and a plurality of non-through grooves 15 are provided on the periphery of the through hole. A brush 16 is fixedly connected to the bottom surface of the dust cover 8, and the brush 16 can effectively clean dust.

[0033] Please refer to Figures 1-4 , the present utility model provides a magnetic bearing structure for a turbomachine, including an outer ring 1 of a magnetic bearing and an inner ring 2 of a magnetic bearing. The inner cavity of the outer ring 1 of the magnetic bearing is provided with the inner ring 2 of the magnetic bearing. A cage 3 is provided between the outer ring 1 of the magnetic bearing and the inner ring 2 of the magnetic bearing. A ball 4 is provided inside the cage 3. The bottom end of the inner wall of the outer ring 1 of the magnetic bearing is fixedly connected with a dust-proof plate 5. A through hole 6 is provided at the center of the top of the dust-proof plate 5. A convex ring 7 is fixedly provided at the top of the through hole 6. The convex ring 7 surrounds the through hole 6. The top end of the inner wall of the outer ring 1 of the magnetic bearing is threadedly connected with a dust cover 8. A through hole is provided at the center of the dust cover 8. A plurality of grooves 15 are provided on the periphery of the through hole on the dust cover 8. A brush 16 is fixedly connected to the bottom surface of the dust cover 8. The dust cover 8 is threadedly connected with the inner wall of the outer ring 1 of the magnetic bearing. An external thread 9 is provided at the connection between the outer ring 1 of the magnetic bearing and the dust cover 8. An internal thread 10 is provided on the surface of the dust cover 8. The internal thread 10 is correspondingly arranged with the external thread 9. A first raceway 11 is provided on one side of the connection between the center of the inner wall of the outer ring 1 of the magnetic bearing and the ball 4. A second raceway 13 is provided on one side of the connection between the center of the outer side of the inner ring 2 of the magnetic bearing and the ball 4. Oil injection holes 12 are provided on both sides of the top and both sides of the bottom of the outer ring 1 of the magnetic bearing. One end of each oil injection hole 12 is fixedly communicated with the first raceway 11.

[0034] Preferably, the hole direction of the oil injection hole 12 is inclined towards the direction of the ball 4. A sealing plug 14 is provided on each of the plurality of oil injection holes 12. The sealing plug 14 provided on the oil injection hole 12 is used to prevent the lubricating oil from flowing out of the oil injection hole 12 during the rotation of the magnetic bearing.

[0035] Preferably, a stator 18 is fixedly connected to the outer ring of the inner ring 2 of the magnetic bearing. A rotor 17 is provided inside the inner ring of the inner ring 2 of the magnetic bearing. The rotor 17 can rotate inside the inner ring of the inner ring 2 of the magnetic bearing. A coil is provided inside the stator 18.

[0036] Preferably, both the outer ring 1 of the magnetic bearing and the inner ring 2 of the magnetic bearing are made of high carbon steel. High carbon steel has high strength and hardness, and its own mechanical properties are relatively excellent.

[0037] Preferably, the surface of the outer ring 1 of the magnetic bearing is sprayed with wear-resistant paint. The wear-resistant paint effectively reduces the wear degree of the outer ring 1 of the magnetic bearing and improves its service life.

[0038] Preferably, four grooves 15 are formed on the surface of the dust cover 8, and brushes 16 are fixedly connected to both sides of the bottom of the dust cover 8. By inserting a finger or a rotating tool into the grooves 15, it is convenient to rotate the dust cover 8 to disengage it from the outer ring 1 of the magnetic bearing, facilitating installation. The brushes 16 can clean the balls 4 at any time, preventing dust and other impurities from falling on the balls 4, improving the working efficiency and service life of the magnetic bearing.

[0039] During specific use, for a magnetic bearing structure for turbomachinery provided by the present utility model, the inner shaft frame is embedded between the dust cover 8 and the dust plate 5. A finger or a rotating tool is inserted into the groove 15, and then the dust cover 8 is screwed into the interior of the outer ring 1 of the magnetic bearing, enabling the external thread 9 to cooperate with the internal thread 10 to tightly fix the dust cover 8 on the outer ring 1 of the magnetic bearing. Through the cooperation of the dust plate 5 and the dust cover 8, the rolling shaft columns are sealed, preventing a large amount of dust from adhering to the rolling shaft columns and wearing out the inner part of the housing, thereby increasing the sliding friction. During the operation of the magnetic bearing, the cage 3 wraps around the balls 4 and rolls between the first raceway 11 and the second raceway 13. After long-term use, lubricating oil is injected through the oil injection hole 12 and evenly coated in the first raceway 11 and the second raceway 13 by the continuous rolling of the balls 4 to achieve smooth rotation of the magnetic bearing, ensuring sufficient lubrication, improving the sensitivity of the magnetic bearing during operation, and extending the service life of the magnetic bearing while enhancing its working efficiency. The overall structure is simple and highly practical, suitable for social promotion.

[0040] Embodiment

[0041] This embodiment provides a magnetic bearing structure for a turbomachine, including a magnetic bearing outer ring 1 and a magnetic bearing inner ring 2. The magnetic bearing inner ring 2 is arranged in the inner cavity of the magnetic bearing outer ring 1. A cage 3 is arranged between the magnetic bearing outer ring 1 and the magnetic bearing inner ring 2. Ball bearings 4 are arranged inside the cage 3. A dust-proof plate 5 is fixedly connected to the bottom end of the inner wall of the magnetic bearing outer ring 1. A through hole 6 is opened at the center of the top of the dust-proof plate 5. A convex ring 7 is fixedly arranged at the top of the through hole 6. A dust-proof cover 8 is threadedly connected to the top end of the inner wall of the magnetic bearing outer ring 1. The dust-proof cover 8 is threadedly connected to the inner wall of the magnetic bearing outer ring 1. An external thread 9 is opened at the connection between the magnetic bearing outer ring 1 and the dust-proof cover 8. An internal thread 10 is opened on the surface of the dust-proof cover 8. The internal thread 10 is arranged corresponding to the external thread 9. Four grooves 15 are opened on the surface of the dust-proof cover 8, and brushes 16 are fixedly connected to both sides of the bottom of the dust-proof cover 8. A first raceway 11 is opened on one side of the connection between the center of the inner wall of the magnetic bearing outer ring 1 and the ball bearings 4. A second raceway 13 is opened on one side of the connection between the center of the outer side of the magnetic bearing inner ring 2 and the ball bearings 4. Oil injection holes 12 are opened on both sides of the top and bottom of the magnetic bearing outer ring 1. The outlet ends of the eight oil injection holes 12 are fixedly communicated with the first raceway 11. In this embodiment, by arranging the oil injection holes 12 on both side walls, the appropriate oil injection hole 12 can be selected according to the actual installation situation of the magnetic bearing to lubricate the magnetic bearing. Among them, sealing plugs 14 are arranged on the eight (four on the top and four on the bottom) oil injection holes 12.

[0042] Among them, the hole channels of the oil injection holes 12 are inclined towards the direction of the ball bearings 4. The hole channels of the oil injection holes 12 opened on the top surface of the magnetic bearing outer ring 1 are inclined downward, and the hole channels of the oil injection holes 12 opened on the bottom surface of the magnetic bearing outer ring 1 are inclined upward.

[0043] Among them, a stator 18 is fixedly connected to the outer ring of the magnetic bearing inner ring 2. A rotor 17 is arranged inside the inner ring of the magnetic bearing inner ring 2. The rotor 17 can rotate inside the inner ring of the magnetic bearing inner ring 2. Coils are arranged inside the stator 18. The outer diameter of the dust-proof cover 8 is the same as the inner diameter of the magnetic bearing outer ring 1. The diameter of the through hole on the dust-proof cover 8 is the same as the diameter of the rotor 17; the diameter of the through hole 6 on the dust-proof plate 5 is the same as the diameter of the rotor 17, and the diameter of the dust-proof plate 5 is the same as the outer diameter of the magnetic bearing outer ring 1.

[0044] Among them, the surface of the magnetic bearing outer ring 1 is sprayed with wear-resistant paint. The magnetic bearing outer ring 1 and the magnetic bearing inner ring 2 are magnetic bearing components made of high-carbon steel.

[0045] In this embodiment, by providing oil injection holes 12 on both side walls of the outer ring 1 of the magnetic bearing, the appropriate oil injection hole 12 can be selected according to the actual installation situation of the magnetic bearing to lubricate the magnetic bearing. By providing a dust cover 8 and a dust-proof plate 5, the inner shaft is completely embedded in a sealed space, which can effectively isolate most dust outside the inner and outer rings, prevent external dust from entering the rotating cage 3 and balls 4, and at the same time ensure that the lubricating oil inside the magnetic bearing does not easily flow out, enhancing its dust-proof performance and effectively reducing its friction coefficient. At the same time, the outer ring 1 and the inner ring 2 of the magnetic bearing itself have relatively high mechanical hardness and long service life.

[0046] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A magnetic bearing structure for turbomachinery, characterized in that, It includes an outer ring (1) of a magnetic bearing, a magnetic bearing inner ring (2) is arranged in the inner cavity of the outer ring (1) of the magnetic bearing, and a plurality of oil injection holes (12) are symmetrically arranged on the top surface and the bottom surface of the outer ring (1) of the magnetic bearing; a dust-proof plate (5) is arranged at the bottom of the outer ring (1) of the magnetic bearing; a through hole (6) is penetrated through the center of the dust-proof plate (5), and an upward convex ring (7) is arranged around the through hole (6) on the dust-proof plate (5); a dust-proof cover (8) is arranged at the top of the outer ring (1) of the magnetic bearing, a through hole is arranged at the center of the dust-proof cover (8), a plurality of grooves (15) are arranged around the periphery of the through hole on the dust-proof cover (8), and a brush (16) is fixedly connected to the bottom surface of the dust-proof cover (8).

2. The magnetic bearing structure for a turbomachine according to claim 1, characterized in that, The dust-proof cover (8) is threadedly connected to the inner wall of the outer ring (1) of the magnetic bearing.

3. A magnetic bearing structure for a turbomachine according to claim 1, characterized in that, A cage (3) is arranged between the outer ring (1) of the magnetic bearing and the inner ring (2) of the magnetic bearing, and balls (4) are arranged inside the cage (3).

4. A magnetic bearing structure for turbomachinery according to claim 3, characterized in that, A first raceway (11) is arranged on one side of the connection between the center of the inner wall of the outer ring (1) of the magnetic bearing and the ball (4), and a second raceway (13) is arranged on one side of the connection between the center of the outer side of the inner ring (2) of the magnetic bearing and the ball (4).

5. A magnetic bearing structure for turbomachinery according to claim 4, characterized in that, The outlet ends of the oil injection holes (12) are all communicated with the first raceway (11).

6. A magnetic bearing structure for a turbomachine according to claim 5, characterized in that, The channels of the oil injection holes (12) are inclined towards the direction of the balls (4).

7. A magnetic bearing structure for a turbomachine according to claim 1, characterized in that, Sealing plugs (14) are arranged on a plurality of the oil injection holes (12).

8. A magnetic bearing structure for a turbomachine according to claim 1, characterized in that, A stator (18) is fixedly connected to the outer ring of the inner ring (2) of the magnetic bearing, a rotor (17) is arranged on the inner ring of the inner ring (2) of the magnetic bearing, and a coil is arranged inside the stator (18).

9. A magnetic bearing structure for a turbomachine according to claim 1, characterized in that, The outer ring (1) of the magnetic bearing and the inner ring (2) of the magnetic bearing are magnetic bearing components made of high carbon steel.

10. A magnetic bearing structure for a turbomachine according to claim 1, characterized in that, The surface of the outer ring (1) of the magnetic bearing is sprayed with wear-resistant paint.

Images