Corrosion-resistant and rust-proof bearing ring

Abstract

This invention discloses a corrosion-resistant and rust-proof bearing ring applied in the field of bearing technology. By setting a magnetic sealing unit at the end of the ring shaft, multiple sealing layers can be formed between the rotating shaft and the bearing end, effectively intercepting external dust, water stains, etc. from entering between the inner ring and the rotating shaft. This effectively avoids the impact of dust, water stains, etc. on the inner wall of the ring. Compared with the existing technology that only uses an interference fit, it effectively eliminates the micro-gap between the two, reduces fretting corrosion, and improves the bearing's rust prevention effect. Through the setting of a monitoring and control unit, the magnetic fluid used for sealing can be monitored, which facilitates timely detection of its radial outward movement under the action of centrifugal force. This allows the operator to replenish the magnetic fluid in a timely manner, effectively avoiding the deterioration of the sealing effect due to magnetic fluid loss and improving the corrosion resistance and rust prevention effect.

Description

Technical Field

[0001] This invention relates to the field of bearing-related technologies, and in particular to a corrosion-resistant and rust-proof bearing ring. Background Technology

[0002] Bearing rings are an important component in modern mechanical equipment. Their main function is to support rotating parts of the machine and reduce the coefficient of friction during movement, ensuring rotational accuracy. Bearings operating in humid, water-filled, or high-humidity environments are highly susceptible to corrosion on the mating surfaces between the bearing rings and the rotating shaft, which can lead to bearing seizure, loss of accuracy, and even complete machine failure.

[0003] Traditional bearing rust prevention solutions mainly fall into two categories: one is to isolate corrosive media by coating the balls or raceways with lubricant, but this method is difficult to effectively prevent the negative impact of humid air on the mating surfaces in the long term, and its sealing performance is poor, failing to block dust in the air; the other is to install rubber sealing rings or metal dust covers at the bearing ends, such as the rust-proof bearing ring structure disclosed in Chinese patent CN221003525U, which uses a cover plate at the end of the inner ring to block dust and humid air. However, neither of the above solutions addresses the direct protection of the mating surfaces between the bearing inner ring and the rotating shaft. In actual engineering, even if the inner ring and shaft use an interference fit, there is still a 0.1-1.0 μm micro-movement clearance on the metal surface at the microscale, and the actual contact area of ​​the mating surface only accounts for 5%-15% of the nominal area. Moisture and corrosive media can penetrate into the micro-gap through capillary action, triggering crevice corrosion and fretting corrosion under the action of oxygen concentration cells. Interference fits cannot fundamentally eliminate the risk of rust at the mating surfaces.

[0004] Magnetorheological fluid (MFL) sealing technology has been explored for application in bearing sealing in recent years due to its advantages such as zero leakage and no contact wear. For example, Chinese patent CN103842675A discloses a bearing with a magnetic fluid seal, which uses an annular magnet at the opening between the inner and outer rings to seal the rolling element assembly via MFL. However, this solution places the MFL on the raceway opening side between the inner and outer rings, primarily addressing the internal sealing of the raceway, without addressing the protection of the mating surface between the inner ring and the rotating shaft. This results in relatively low overall rust and corrosion resistance of the inner ring, affecting bearing life. Summary of the Invention

[0005] The core of this invention lies in forming a multi-layered magnetofluid sealing layer by setting a magnetic sealing unit on the axial end face of the inner ring. This solves the problem in existing technologies where interference fit alone cannot eliminate the microscopic gaps between the inner ring and the rotating shaft mating surface, leading to crevice corrosion and fretting corrosion. Simultaneously, by setting up a fluid replenishment channel and a monitoring and control unit, real-time monitoring and convenient replenishment of magnetofluid loss are achieved.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A corrosion-resistant and rust-proof bearing ring includes a matching outer ring and an inner ring, and two shoulders fixedly connected to the outer end of a rotating shaft that matches the bearing, and two anti-spin rings respectively fixedly connected to the outer ring of the shoulders. A sealing gap is formed between the axial end face of the inner ring and the shoulders. The edges of the two anti-spin rings wrap around the outer edge of the inner ring. The bearing ring is located between the two shoulders. Both axial end faces of the bearing ring are provided with magnetic sealing units. The magnetic sealing unit includes at least one annular groove carved on the axial end face of the inner ring, a magnetic fluid filled in the annular groove, and a main permanent magnet ring embedded in the axial end face of the inner ring. The main permanent magnet ring faces the annular groove. The inner ring is also carved with a main fluid supply channel and multiple fluid supply branch channels. The multiple fluid supply branch channels are respectively connected to the annular groove and the main fluid supply channel. The opening of the main fluid supply channel is located on the outer wall of the inner ring, and the sealing plug of the opening of the main fluid supply channel is provided with a plug.

[0008] Furthermore, the main permanent magnet ring includes multiple coaxially arranged magnetic rings and non-magnetic rings, and the multiple magnetic rings and non-magnetic rings are staggered and distributed with each other, and adjacent magnetic rings and non-magnetic rings are in contact with each other.

[0009] Furthermore, multiple magnetic rings are respectively aligned with multiple annular grooves, and the radial thickness of the magnetic rings is consistent with the radial span of the annular grooves.

[0010] Furthermore, the shoulder is also equipped with a measurement and control unit for monitoring whether the magnetofluid deviates from the magnetic field region. The measurement and control unit includes a detection ring fixedly connected to the end of the shoulder away from the inner ring, a guide hole drilled on the shoulder, multiple sensing strips set in the detection ring, and a secondary permanent magnet ring embedded in the detection ring. The multiple sensing strips correspond to the guide holes, the secondary permanent magnet ring faces the sensing strips, and the secondary permanent magnet ring is located on the side of the sensing strip away from the guide hole.

[0011] Furthermore, the sensing strip includes an outer cylinder, a sensing element installed on the radial inner wall of the outer cylinder, and a sensing rod located inside the outer cylinder. The outer cylinder is directly opposite the opening of the guide hole, and one end of the sensing rod extends into the guide hole, while the other end of the sensing rod contacts the sensing element. The guide hole has a small size in the middle and a large size at both sides of the cross-section, and the end of the sensing strip contacts the variable diameter edge on the corresponding side of the guide hole.

[0012] Furthermore, the sensing rod includes a deformable segment and a fixed segment fixedly connected to the deformable segment. The contact point between the sensing rod and the sensing element is located on the deformable segment, and the deformable segment is made of an elastic material.

[0013] Furthermore, the measurement and control unit is located outside multiple annular grooves, and in the axial direction, the auxiliary permanent magnet ring is misaligned with the main permanent magnet ring.

[0014] Optionally, the detection ring includes a warning ring and a sensing ring fixedly connected to the outer end of the warning ring. Electronic components are installed inside the sensing ring, including but not limited to LED lights and signal transmitters. The sensing element is a self-resetting signal switch used to control the power supply of the electronic components. The measurement and control unit is located inside the warning ring.

[0015] Optionally, the sensing element is a pressure sensor.

[0016] Compared with the prior art, the advantages of this invention are:

[0017] (1) By setting the magnetic sealing unit at the end of the ring shaft, this solution can form multiple sealing layers between the rotating shaft and the end of the bearing, thereby effectively intercepting external dust, water stains and other substances from entering between the inner ring and the rotating shaft, thus effectively avoiding the influence of dust, water stains and other substances on the inner wall of the ring. Compared with the existing technology of only interference fit, it effectively eliminates the micro gap between the two, reduces fretting corrosion and improves the bearing rust prevention effect.

[0018] (2) By setting up the measurement and control unit, the magnetic fluid used for sealing can be monitored, which makes it easy to detect the radial outward movement of the fluid under the action of centrifugal force in a timely manner, so that the staff can replenish the magnetic fluid in a timely manner, effectively avoid the situation that the sealing effect deteriorates due to the loss of magnetic fluid, and improve the corrosion resistance and rust prevention effect. Attached Figure Description

[0019] Figure 1 This is a partial exploded view of the present invention;

[0020] Figure 2 This is a perspective view of the present invention;

[0021] Figure 3 This is a cross-sectional view of the bearing inner ring portion of the present invention;

[0022] Figure 4 for Figure 3 A schematic diagram at point A in the middle;

[0023] Figure 5 This is a cross-sectional schematic diagram of the main permanent magnet ring portion of the present invention;

[0024] Figure 6 This is a cross-sectional schematic diagram of the sensing strip portion of the present invention;

[0025] Figure 7 This is a cross-sectional view of the measurement and control unit portion of the present invention when the magnetofluid migrates radially;

[0026] Figure 8 This is a schematic diagram of the present invention when a magnetic sealing unit is also provided on the inner wall of the inner ring.

[0027] Explanation of the labels in the diagram:

[0028] 11 Outer ring, 12 Inner ring, 13 Shoulder, 14 Anti-slip ring, 101 Annular groove, 2 Detection ring, 21 Warning ring, 22 Sensing ring, 3 Sensing strip, 31 Outer cylinder, 321 Deformation section, 322 Fixed section, 33 Sensing element, 301 Flow guide hole, 4 Secondary permanent magnet ring, 5 Main permanent magnet ring, 51 Magnetic ring, 52 Non-magnetic ring, 61 Main liquid replenishment channel, 62 Sub-channel for liquid replenishment. Detailed Implementation

[0029] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0030] First implementation method:

[0031] like Figures 1-2 In the figure, 'a' represents a rotating shaft. A corrosion-resistant and rust-proof bearing ring includes a matching outer ring 11 and an inner ring 12. It also includes two shoulders 13 fixedly connected to the outer end of the rotating shaft that matches the bearing, and two anti-spin rings 14 fixedly connected to the outer ring of the shoulders 13. A sealing gap is formed between the axial end face of the inner ring 12 and the shoulders 13. The edges of the two anti-spin rings 14 wrap around the outer edge of the inner ring 12. The bearing ring is located between the two shoulders 13. Magnetic sealing units are provided on both axial end faces of the bearing ring.

[0032] like Figures 3-4 In the figure, b represents the sealing gap and c represents the magnetic fluid. The magnetic sealing unit includes at least one annular groove 101 carved into the axial end face of the inner ring 12, magnetic fluid filled in the annular groove 101, and a main permanent magnet ring 5 embedded in the axial end face of the inner ring 12. The main permanent magnet ring 5 is mainly used to bind the magnetic fluid, so that the magnetic fluid filled in the annular groove 101 can be solidified under the action of the main permanent magnet ring 5, and thus be stably bound in the annular groove 101, thereby stably forming multiple magnetic sealing layers. The main permanent magnet ring 5 faces the annular groove 101. The inner ring 12 also has a main fluid replenishment channel 61 and multiple fluid replenishment branch channels carved into it. 62. Multiple fluid replenishment branches 62 are connected to the annular groove 101 and the main fluid replenishment channel 61 respectively. The opening of the main fluid replenishment channel 61 is located on the outer wall of the inner ring 12, and the sealing plug at the opening of the main fluid replenishment channel 61 is provided with a plug. During use, magnetic fluid can be replenished into the multiple annular grooves 101 at regular intervals through the main fluid replenishment channel 61 and the fluid replenishment branches 62, so that multiple magnetic sealing layers can be stably formed in the multiple annular grooves 101 within the sealing gap, thereby effectively intercepting external dust, water stains, etc., and thus effectively protecting the rotating shaft from electrochemical corrosion caused by the intrusion of dust and water stains between it and the inner ring 12, thereby improving the rust prevention effect.

[0033] like Figure 5The main permanent magnet ring 5 includes multiple coaxially arranged magnetic rings 51 and non-magnetic rings 52, which are staggered and adjacent magnetic rings 51 and non-magnetic rings 52 are in contact with each other. The non-magnetic rings 52 are preferably made of magnetic shielding material, mainly to ensure that there is no magnetic field or only a very small magnetic force in the area outside the area corresponding to the annular groove 101 within the sealing gap. This allows the magnetohydrodynamic energy between the multiple annular grooves 101 to be spaced apart and not easily connected in series to form a magnetic sealing layer, thus ensuring stability. The formation of a multi-layer magnetic seal can effectively prevent the radial migration of the magnetic fluid and reduce its loss. Multiple magnetic rings 51 are respectively aligned with multiple annular grooves 101, and the radial thickness of the magnetic rings 51 is consistent with the radial span of the annular grooves 101. This effectively ensures that each annular groove 101 has a corresponding magnetic ring 51 with the same radial thickness, so that the magnetic fluid in different annular grooves 101 can be subjected to the same magnetic force. This makes the multi-layer magnetic seal formed by the magnetic fluid relatively stable, with a consistent state, and the sealing effect is less likely to be inconsistent.

[0034] It is worth noting that the axial span of the sealing gap is no more than 0.5 mm, meaning the gap is very small. Figure 3 and Figure 4 The gap is shown as large only to illustrate the distance.

[0035] Second implementation method:

[0036] This embodiment adds a measurement and control unit to the first embodiment, while the rest remains the same as the first embodiment.

[0037] like Figure 4 The shoulder 13 is also equipped with a measurement and control unit for monitoring whether the magnetofluid deviates from the magnetic field region. The measurement and control unit includes a detection ring 2 fixedly connected to the end of the shoulder 13 away from the inner ring 12, a guide hole 301 drilled on the shoulder 13, multiple sensing strips 3 set in the detection ring 2, and a secondary permanent magnet ring 4 embedded in the detection ring 2. The multiple sensing strips 3 correspond to the guide hole 301, the secondary permanent magnet ring 4 faces the sensing strips 3, and the secondary permanent magnet ring 4 is located on the side of the sensing strips 3 away from the guide hole 301.

[0038] like Figure 6The sensing strip 3 includes an outer cylinder 31, a sensing element 33 installed on the radial inner wall of the outer cylinder 31, and a sensing rod located inside the outer cylinder 31. The sensing rod includes a deformation section 321 and a fixed section 322 fixedly connected to the deformation section 321. The contact point between the sensing rod and the sensing element 33 is located on the deformation section 321, and the deformation section 321 is made of elastic material. The outer cylinder 31 is directly opposite the opening of the guide hole 301, and one end of the sensing rod extends into the guide hole 301. The other end of the sensing rod contacts the sensing element 33. The guide hole 301 has a small size in the middle of its cross-section and a large size at both sides. The end of the sensing strip 3 contacts the variable diameter edge on the corresponding side of the guide hole 301, effectively ensuring that the sensing rod cannot move axially when not subjected to external force. Only when the magnetic fluid migrates radially outward and reaches the guide hole 301 can the sensing rod be axially compressed under the action of the magnetic field and pushed by the magnetic fluid, thus activating the sensing element 33.

[0039] The measurement and control unit is located outside the multiple annular grooves 101. In the axial direction, the auxiliary permanent magnet ring 4 and the main permanent magnet ring 5 are misaligned, so that the magnetic fluid migrating radially outward on the outermost annular groove 101 is only affected by the magnetic field of the auxiliary permanent magnet ring 4 when passing through the guide hole 301, and is not affected by the magnetic field of the main permanent magnet ring 5. This effectively ensures that the magnetic fluid gathers in the guide hole 301, thereby squeezing the sensing rod and causing the sensing element 33 to undergo obvious changes to indicate the loss of magnetic fluid.

[0040] The detection ring 2 includes an alarm ring 21 and a sensing ring 22 fixedly connected to the outer end of the alarm ring 21. Electronic components are installed inside the sensing ring 22, including but not limited to LED lights and signal transmitters. The sensing element 33 is a self-resetting signal switch used to control the power supply to the electronic components. The measurement and control unit is located inside the alarm ring 21. Figure 7 When magnetofluid is lost, it passes through the guide hole 301 and, due to the magnetic field binding of the secondary permanent magnet ring 4, gathers in the guide hole 301, thus approaching the sensing rod. Due to the magnetic attraction, the movement of the magnetofluid will exert a squeezing force on the sensing rod, thereby causing the deformation section 321 to deform slightly and squeeze the sensing element 33, which in turn energizes the electronic component, allowing it to be lit up (when the electronic component is an LED light) or to transmit an energized signal to an external mobile terminal (when the electronic component is a signal transmitter). This allows the radial migration of the magnetofluid to be detected. When the operator finds that the bearing end is emitting light or the mobile terminal receives an energized signal, the magnetofluid can be replenished in time to maintain a good sealing effect.

[0041] By setting up the measurement and control unit, the magnetic fluid used for sealing can be monitored, making it easy to detect its radial outward movement under the action of centrifugal force in a timely manner. This allows staff to replenish the magnetic fluid in a timely manner, effectively avoiding the situation where the sealing effect deteriorates due to the loss of magnetic fluid and improving the corrosion resistance and rust prevention effect.

[0042] The third implementation method:

[0043] The sensing element 33 can also be selected as a pressure sensor. In this case, the detection ring 2 does not need to be set as an alarm ring 21 and a sensing ring 22; it can be a single unit. When magnetic fluid leakage occurs, the magnetic fluid passes through the guide hole 301. Due to the magnetic field binding of the secondary permanent magnet ring 4, the magnetic fluid will gather in the guide hole 301 and approach the sensing rod. Due to the magnetic attraction, the movement of the magnetic fluid will generate a squeezing force on the sensing rod, which will cause the deformation section 321 to deform slightly and squeeze the sensing element 33, causing a significant change in the data on it. Based on the data change, the leakage of magnetic fluid can be understood in time, which is convenient for timely replenishment and maintaining a good sealing effect.

[0044] Fourth implementation method:

[0045] like Figure 8 In this embodiment, a magnetic sealing unit can be further provided on the inner wall of the inner ring 12. Specifically, the annular groove 101 is provided on the inner wall of the inner ring 12, the main permanent magnet ring 5 is axially embedded in the inner ring 12, and the main liquid replenishment channel 61 is axially provided. At this time, with the joint provision of two sets of magnetic sealing units in the axial and radial directions, radial sealing can be achieved between the bearing and the rotating shaft, and axial micro-movement gap can be eliminated. This effectively avoids electrochemical corrosion of the inner ring 12 caused by the presence of micro-movement gap and improves the service life of the bearing.

[0046] In practice, it may be necessary to implement a magnetic sealing unit on the inner wall of the inner ring 12, depending on actual needs.

[0047] The above description is merely a preferred embodiment of the present invention; it encompasses all the protection scope of the present invention. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solutions and improved concepts of the present invention, should be covered within the protection scope of the present invention.

Claims

1. A corrosion-resistant and rust-proof bearing ring, comprising a matching outer ring (11) and an inner ring (12), characterized in that: It also includes two shoulders (13) fixedly connected to the outer end of the rotating shaft that matches the bearing, and two anti-slip rings (14) fixedly connected to the outer ring of the shoulders (13). A sealing gap is formed between the axial end face of the inner ring (12) and the shoulders (13). The edges of the two anti-slip rings (14) wrap around the outer edge of the inner ring (12). The bearing ring is located between the two shoulders (13). Both axial end faces of the bearing ring are provided with magnetic sealing units. The magnetic sealing unit includes at least one annular groove (14) carved into the axial end face of the inner ring (12). 01) The magnetic fluid filled in the annular groove (101) and the main permanent magnet ring (5) embedded in the axial end face of the inner ring (12) are respectively facing the annular groove (101). The inner ring (12) is also provided with a main liquid replenishment channel (61) and multiple liquid replenishment branch channels (62). The multiple liquid replenishment branch channels (62) are respectively connected to the annular groove (101) and the main liquid replenishment channel (61). The opening of the main liquid replenishment channel (61) is located on the outer wall of the inner ring (12), and the opening of the main liquid replenishment channel (61) is sealed with a plug.

2. The corrosion-resistant and rust-proof bearing ring according to claim 1, characterized in that: The main permanent magnet ring (5) includes multiple coaxially arranged magnetic rings (51) and non-magnetic rings (52), and the multiple magnetic rings (51) and non-magnetic rings (52) are staggered and distributed, and adjacent magnetic rings (51) and non-magnetic rings (52) are in contact with each other.

3. The corrosion-resistant and rust-proof bearing ring according to claim 2, characterized in that: The plurality of magnetic rings (51) are respectively aligned with the plurality of annular grooves (101), and the radial thickness of the magnetic rings (51) is consistent with the radial span of the annular grooves (101).

4. The corrosion-resistant and rust-proof bearing ring according to claim 1, characterized in that: The shoulder (13) is also provided with a measurement and control unit for monitoring whether the magnetofluid deviates from the magnetic field region. The measurement and control unit includes a detection ring (2) fixedly connected to the end of the shoulder (13) away from the inner ring (12), a guide hole (301) drilled on the shoulder (13), a plurality of sensing strips (3) set in the detection ring (2), and a secondary permanent magnet ring (4) embedded in the detection ring (2). The plurality of sensing strips (3) correspond to the guide hole (301), the secondary permanent magnet ring (4) faces the sensing strip (3), and the secondary permanent magnet ring (4) is located on the side of the sensing strip (3) away from the guide hole (301).

5. The corrosion-resistant and rust-proof bearing ring according to claim 1, characterized in that: The sensing strip (3) includes an outer cylinder (31), a sensing element (33) installed on the radial inner wall of the outer cylinder (31), and a sensing rod located inside the outer cylinder (31). The outer cylinder (31) is directly opposite the opening of the guide hole (301), and one end of the sensing rod extends into the guide hole (301). The other end of the sensing rod contacts the sensing element (33). The guide hole (301) has a small size in the middle of its cross-section and a large size at both sides of its opening. The end of the sensing strip (3) contacts the variable diameter edge on the corresponding side of the guide hole (301).

6. The corrosion-resistant and rust-proof bearing ring according to claim 5, characterized in that: The sensing rod includes a deformable segment (321) and a fixed segment (322) fixedly connected to the deformable segment (321). The contact point between the sensing rod and the sensing element (33) is located on the deformable segment (321), and the deformable segment (321) is made of an elastic material.

7. The corrosion-resistant and rust-proof bearing ring according to claim 6, characterized in that: The measurement and control unit is located outside the multiple annular grooves (101), and in the axial direction, the auxiliary permanent magnet ring (4) is misaligned with the main permanent magnet ring (5).

8. The corrosion-resistant and rust-proof bearing ring according to claim 7, characterized in that: The detection ring (2) includes a warning ring (21) and a sensing ring (22) fixedly connected to the outer end of the warning ring (21). Electronic components are installed in the sensing ring (22). The sensing element (33) is a self-resetting signal switch used to control the power supply of the electronic components. The measurement and control unit is located inside the warning ring (21).

9. A corrosion-resistant and rust-proof bearing ring according to claim 7, characterized in that: The sensing element (33) is a pressure sensor.

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