A bearing isolation device
By adopting dynamic ring, static ring and composite maze structure in the bearing isolator, the problem of poor sealing effect of bearing isolator under long-lasting rotation is solved, achieving a longer sealing life and a better sealing effect.
Patent Information
- Application Number
- CN202421741109.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-07-22
AI Technical Summary
Existing bearing isolators have poor sealing effect when rotated for a long time, which is prone to leakage of lubricant oil and invasion of external impurities.
A bearing isolation device is designed, adopting a moving and static ring structure, combining a sealing groove and a sealing ring to form a composite maze structure to enhance the sealing effect, and reduce lubricating oil leakage by setting a barrier groove and an oil return groove.
Effectively prevent the sealing ring from wear on the shaft, extend the sealing life, enhance the barrier effect on lubricant oil, improve the sealing effect, and reduce lubricant leakage and external impurities intrusion.
Smart Images
Figure CN222731965U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of bearing isolation, in particular to a bearing isolation device. Background Art
[0002] The main purpose of the bearing isolator is to prevent external coolant, impurities, etc. from entering the bearing cavity and to ensure that the lubricating fluid in the bearing housing does not leak. At the same time, the quickness and convenience of installation and maintenance must also be considered. The bearing isolator is a mechanical device that isolates the bearing from the external environment in which it is located. It keeps the bearing in a well-lubricated and non-contaminated state, thereby achieving its design life under service conditions.
[0003] Skeleton oil seal is a commonly used contact bearing isolator, usually composed of a metal skeleton and an elastic material. The metal skeleton is usually made of metal materials with high strength and good corrosion resistance, and the elastic material is usually made of polymer materials such as rubber or polyurethane. The skeleton and the elastic material are tightly connected together through certain process methods to form an integral structure; the principle of skeleton oil seal is to use the friction and compression between the metal skeleton and the elastic material to achieve the sealing effect. When installed on mechanical equipment, its elastic material forms a certain contact area with the bearing surface and exerts a certain compression force. During operation, the lubricant will gradually penetrate from the edge of the sealing surface and fill the gap between the skeleton oil seal and the bearing. At the same time, the elastic material will produce a certain friction and form a thin film on the lubricant to prevent its leakage and external impurities from invading.
[0004] However, the skeleton oil seal is a static seal. Under long-term rotation, it is easy to scratch the surface of the shaft, and it ages quickly due to temperature rise, forming a sealing gap. The forced lubricating oil with a certain pressure in the oil tank leaks from the gap to the outside and causes pollution. Utility Model Content
[0005] In order to solve the technical problem in the above-mentioned prior art that the sealing effect of the bearing isolator is poor under long-term rotation, the utility model provides a bearing isolation device, which can improve the sealing effect and sealing life.
[0006] The utility model adopts the following technical solution to solve the above-mentioned technical problems: a bearing isolation device, comprising a first sealing ring, a dynamic ring and a static ring, wherein the static ring is stationary and the dynamic ring can rotate with the shaft, a connecting portion is arranged at the end of the static ring, the dynamic ring is sleeved at the end of the connecting portion and is loosely matched with the connecting portion, a sealing groove 1 is arranged on the outer wall of the connecting portion, the cross section of the sealing groove 1 is an L-shaped structure, a sealing groove 2 is arranged at a corresponding position on the inner wall of the dynamic ring, and the first sealing ring is arranged between the sealing groove 1 and the sealing groove 2.
[0007] On the one hand, the utility model can prevent the sealing ring from wearing the shaft and reduce the adverse effects of high-temperature oil on the first sealing ring by arranging the dynamic ring and the static ring, thereby extending the sealing life. On the other hand, the sealing groove 1 and the first sealing ring form a composite maze structure, which can increase the blocking effect on the lubricating oil in the oil tank and achieve a better sealing effect. When the equipment is shut down, the gap between the dynamic and static rings can be better sealed to prevent water vapor in the air from entering the bearing box through the gap between the dynamic and static rings to dilute the lubricant and reduce the lubricating ability of the lubricant. The dynamic and static rings are combined into an integrated structure for easy installation.
[0008] Furthermore, a first blocking groove and a second blocking groove are provided on the outer circumferential surface of the movable ring extending into the connecting portion, and both the first blocking groove and the second blocking groove are annular grooves.
[0009] The utility model can further increase the blocking effect on the lubricating oil in the oil tank by arranging two blocking grooves, retain the lubricating oil, reduce leakage, and improve the sealing effect.
[0010] Furthermore, the movable ring is provided with a boss, an end surface of the boss is provided with an oil return groove, the oil return groove is an annular groove, the oil return groove is close to the second blocking groove, and the depth of the second blocking groove is greater than that of the first blocking groove.
[0011] Furthermore, a sealing portion is provided at the end of the stationary ring. The sealing portion is coaxially arranged with the connecting portion. The cross section of the sealing portion is an L-shaped structure. The sealing portion extends into the oil return groove. The oil return groove opens toward the stationary ring.
[0012] The utility model can block the lubricating oil by arranging the L-shaped sealing part, thereby preventing the lubricating oil with a certain pressure from directly impacting the static ring.
[0013] Furthermore, the mounting portion of the stationary ring is interference fit with the bearing box housing, and a second sealing ring and a third sealing ring are arranged on the outer circumferential surface of the mounting portion.
[0014] The utility model can increase the sealing effect of the gap between the static ring and the housing by arranging two sealing rings on the mounting part.
[0015] Furthermore, a first oil return groove and a second oil return groove are provided on the inner wall of the mounting portion, the second oil return groove is connected to an oil return hole, the oil return hole is provided on the inner wall of the mounting portion, and the oil return hole is connected to the oil tank.
[0016] Furthermore, a fourth sealing ring is arranged in the first oil return groove.
[0017] The utility model can further enhance the sealing effect and reduce the leakage of lubricating oil by arranging the fourth sealing ring.
[0018] Furthermore, a first dynamic drive ring and a second dynamic drive ring are arranged on the inner wall of the dynamic ring.
[0019] Furthermore, the first dynamic drive ring and the second dynamic drive ring are both O-rings.
[0020] It can be seen from the above technical solutions that the utility model has the following advantages:
[0021] The utility model provides a bearing isolation device. On the one hand, by arranging a dynamic ring and a static ring, it is possible to prevent the seal from wearing the shaft and reduce the adverse effect of high-temperature oil on the first sealing ring, thereby extending the sealing life. On the other hand, the sealing groove 1 and the first sealing ring form a composite maze structure, which can increase the blocking effect on the lubricating oil in the oil tank and achieve a better sealing effect. When the equipment is shut down, the gap between the dynamic and static rings can be better sealed to prevent water vapor in the air from entering the bearing box through the gap between the dynamic and static rings to dilute the lubricant and reduce the lubricating ability of the lubricant. The dynamic and static rings are combined into an integrated structure for easy installation. By arranging two blocking grooves, the blocking effect on the lubricating oil in the oil tank can be further increased, the lubricating oil can be retained, and the sealing effect can be improved. By arranging two sealing rings at the mounting portion, the sealing effect on the gap between the static ring and the housing can be increased. By arranging an L-shaped sealing portion, the lubricating oil can be blocked to prevent the lubricating oil with a certain pressure from directly impacting the static ring. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 It is a structural schematic diagram of a specific implementation method of the utility model.
[0024] Figure 2 It is a schematic diagram of the structure of the stationary ring in a specific implementation manner of the utility model.
[0025] Figure 3 It is a structural schematic diagram of the dynamic ring in a specific implementation manner of the utility model.
[0026] In the figure, 1, first dynamic drive ring; 2, dynamic ring; 201, second blocking groove; 202, first blocking groove; 203, oil return groove; 3, static ring; 301, sealing part; 302, connecting part; 4, second sealing ring; 5, third sealing ring; 6, fourth sealing ring; 7, first sealing ring; 8, second oil return groove; 9, oil return hole; 10, first oil return groove; 11, second dynamic drive ring. DETAILED DESCRIPTION
[0027] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, 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.
[0028] like Figure 1 As shown, this specific embodiment provides a bearing isolation device, including a first sealing ring 7, a dynamic ring 2 and a static ring 3, the static ring 3 is stationary, the dynamic ring 2 can rotate with the shaft, a connecting portion 302 is provided at the end of the static ring 3, the dynamic ring 2 is sleeved on the end of the connecting portion 302 and has a clearance fit with the connecting portion 302, a sealing groove 1 is provided on the outer wall of the connecting portion 302, the cross section of the sealing groove 1 is an L-shaped structure, a sealing groove 2 is provided at a corresponding position on the inner wall of the dynamic ring 2, and the first sealing ring 7 is provided between the sealing groove 1 and the sealing groove 2.
[0029] On the one hand, this specific embodiment can prevent the seal from wearing the shaft and the high-temperature oil from affecting the first sealing ring 7 by setting the dynamic ring 2 and the static ring 3. The static ring 3 and the dynamic ring 2 are clearance-matched to prevent contact with each other, avoid contact wear between the two, reduce the sealing efficiency, and extend the sealing life. On the other hand, the sealing groove 1 and the first sealing ring 7 form a composite maze structure, which can increase the blocking effect on the lubricating oil in the oil tank and achieve a better sealing effect. When the equipment is shut down, it can also better seal the gap between the dynamic and static rings 3 to prevent water vapor in the air from entering the bearing box through the gap between the dynamic and static rings 3 to dilute the lubricant and reduce the lubricating ability of the lubricant. The dynamic and static rings 3 are combined into an integrated structure for easy installation.
[0030] like Figure 1 and Figure 3 As shown, preferably, in order to enhance the sealing effect of the dynamic ring 2, in the present specific embodiment, the dynamic ring 2 extending into the outer circumferential surface of the connecting portion 302 is provided with a first blocking groove 202 and a second blocking groove 201, and the first blocking groove 202 and the second blocking groove 201 are both annular grooves. By providing two blocking grooves, the blocking effect on the lubricating oil in the oil tank can be further increased, and the lubricating oil can be retained to improve the sealing effect; the dynamic ring 2 is provided with a boss, and an oil return groove 203 is provided on the end face of the boss, and the oil return groove 203 is an annular groove, and the oil return groove 203 is close to the second blocking groove 201, and the depth of the second blocking groove 201 is greater than that of the first blocking groove 202.
[0031] like Figure 1 and Figure 2As shown, preferably, in order to enhance the sealing effect of the stationary ring 3, in this specific embodiment, the mounting portion of the stationary ring 3 is interference fit with the bearing box housing, and a second sealing ring 4 and a third sealing ring 5 are provided on the outer circumferential surface of the mounting portion. By arranging two sealing rings on the mounting portion, the sealing effect of the gap between the stationary ring 3 and the housing can be increased.
[0032] like Figure 1 and Figure 2 As shown, preferably, since the forced lubricating oil in the oil tank has a certain pressure and contains certain impurities, in order to weaken the impact of the lubricating oil on the stationary ring 3, a sealing portion 301 is also provided at the end of the stationary ring 3. The sealing portion 301 is coaxially arranged with the connecting portion 302, and the cross-section of the sealing portion 301 is L-shaped. The sealing portion 301 extends into the oil return groove 203, and the opening of the oil return groove 203 faces the stationary ring 3. By providing the L-shaped sealing portion 301, the lubricating oil can be blocked to prevent the lubricating oil with a certain pressure from directly impacting the stationary ring 3.
[0033] like Figure 1 and Figure 2 As shown, in this specific embodiment, a first oil return groove 10 and a second oil return groove 8 are provided on the inner wall of the mounting portion, and the second oil return groove 8 is connected to an oil return hole 9. The oil return hole 9 is provided on the inner wall of the mounting portion, and the oil return hole 9 is connected to the oil tank. In order to enhance the sealing effect, a fourth sealing ring 6 is provided in the first oil return groove 10.
[0034] like Figure 1 As shown, in this specific embodiment, the first dynamic drive ring 1 and the second dynamic drive ring 11 are arranged on the inner wall of the dynamic ring 2. The first dynamic drive ring 1 and the second dynamic drive ring 11 are both O-rings, which become the first barrier of sealing and can effectively reduce the leakage of lubricating oil; the first sealing ring 7 is a star ring.
[0035] The sealing principle of this isolation device is:
[0036] When the lubricating oil enters the moving ring 2, it is first blocked by the first moving drive ring 1 and the second moving drive ring 11, and only a part of the lubricating oil continues to move forward and enters the gap between the moving ring 2 and the static ring 3 and the gap between the shaft and the static ring 3; the lubricating oil entering the gap between the moving ring 2 and the static ring 3 is blocked by the sealing groove 1 and the first sealing ring 7, and only a part of it continues to enter the gap between the moving ring 2 and the static ring 3, and is blocked by the first blocking groove 202 and the second blocking groove 201, and only a small part enters the return oil groove and finally returns to the oil tank; the lubricating oil entering the gap between the shaft and the static ring 3 is blocked by the fourth sealing groove 6, and only a small part of the lubricating oil enters the oil tank from the second return oil groove 8 through the oil return hole 9; by setting a plurality of channels for the lubricating oil to flow back to the oil tank, the amount of lubricating oil reaching the gap between the static ring 3 and the housing can be reduced, and at the same time, the second sealing ring 4 and the third sealing ring 5 are set to prevent the lubricating oil from leaking from the static ring to the outside of the housing.
[0037] From the above specific implementations, it can be seen that the utility model has the following beneficial effects:
[0038] 1. On the one hand, by setting the dynamic ring 2 and the static ring 3, it is possible to prevent the seal from wearing the shaft and the high-temperature oil from affecting the first sealing ring 7. The static ring 3 and the dynamic ring 2 are matched with each other to prevent contact with each other, avoid contact wear between the two, reduce the sealing efficiency, and extend the sealing life. On the other hand, the sealing groove 1 and the first sealing ring 7 form a composite labyrinth structure, which can increase the blocking effect on the lubricating oil in the oil tank and achieve a better sealing effect. When the equipment is shut down, the gap between the dynamic and static rings 3 can be better sealed to prevent water vapor in the air from entering the bearing box through the gap between the dynamic and static rings 3 to dilute the lubricant, reduce the lubricating ability of the lubricant, and combine the dynamic and static rings 3 into an integrated structure for easy installation;
[0039] 2. By setting two blocking grooves, the blocking effect on the lubricating oil can be further increased and the lubricating oil can be retained;
[0040] 3. By providing the L-shaped sealing portion 301, the lubricating oil can be blocked to prevent the lubricating oil with a certain pressure from directly impacting the stationary ring 3;
[0041] 4. By arranging two sealing rings at the mounting portion, the sealing effect of the gap between the static ring 3 and the housing can be increased;
[0042] 5. The use of fluororubber through the fourth sealing ring 6 can be suitable for working conditions with higher oil temperatures and has a certain hardness, meeting the use requirements of reducing leakage of forced lubricating oil in the oil tank.
[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those 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 will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A bearing isolation device, comprising a first sealing ring (7), characterized in that: It also includes a moving ring (2) and a stationary ring (3), wherein the stationary ring (3) is stationary and the moving ring (2) can rotate with the shaft, a connecting portion (302) is provided at the end of the stationary ring (3), the moving ring (2) is sleeved on the end of the connecting portion (302) and is loosely matched with the connecting portion (302), a sealing groove 1 is provided on the outer wall of the connecting portion (302), the cross section of the sealing groove 1 is an L-shaped structure, a sealing groove 2 is provided at a corresponding position on the inner wall of the moving ring (2), and a first sealing ring (7) is provided between the sealing groove 1 and the sealing groove 2.
2. The bearing isolation device according to claim 1, characterized in that: A first blocking groove (202) and a second blocking groove (201) are provided on the outer circumferential surface of the moving ring (2) extending into the connecting portion (302); both the first blocking groove (202) and the second blocking groove (201) are annular grooves.
3. The bearing isolation device according to claim 2, characterized in that: The movable ring (2) is provided with a boss, and an oil return groove (203) is provided on the end surface of the boss. The oil return groove (203) is an annular groove. The oil return groove (203) is close to the second blocking groove (201), and the depth of the second blocking groove (201) is greater than that of the first blocking groove (202).
4. The bearing isolation device according to claim 3, characterized in that: A sealing portion (301) is also provided at the end of the stationary ring (3). The sealing portion (301) is coaxially arranged with the connecting portion (302). The cross section of the sealing portion (301) is an L-shaped structure. The sealing portion (301) extends into the oil return groove (203), and the opening of the oil return groove (203) faces the stationary ring (3).
5. The bearing isolation device according to any one of claims 1 to 4, characterized in that: The mounting portion of the stationary ring (3) is interference-fitted with the bearing box housing, and a second sealing ring (4) and a third sealing ring (5) are arranged on the outer circumferential surface of the mounting portion.
6. The bearing isolation device according to claim 5, characterized in that: A first oil return groove (10) and a second oil return groove (8) are arranged on the inner wall of the mounting portion, the second oil return groove (8) is connected to an oil return hole (9), the oil return hole (9) is arranged on the inner wall of the mounting portion, and the oil return hole (9) is connected to the oil tank.
7. The bearing isolation device according to claim 6, characterized in that: A fourth sealing ring (6) is arranged in the first oil return groove (10).
8. The bearing isolation device according to claim 7, characterized in that: A first dynamic drive ring (1) and a second dynamic drive ring (11) are arranged on the inner wall of the dynamic ring (2).
9. The bearing isolation device according to claim 8, characterized in that: The first dynamic drive ring (1) and the second dynamic drive ring (11) are both O-type sealing rings.