Labyrinth type bearing isolator suitable for internal and external pressure difference

Abstract

The utility model relates to the technical field of bearing isolators, and discloses a labyrinth type bearing isolator suitable for internal and external pressure difference, which comprises a static ring arranged close to the inner part of a bearing box, at least one first annular groove arranged on the connecting surface of the outer ring of the static ring and the bearing box, and at least one second annular groove arranged on the connecting surface of the outer ring of the static ring and the bearing box, the distance between the groove bottom of the first annular groove and the rotating shaft is gradually reduced from the inside to the outside of the bearing box; the first sealing ring falls into the groove bottom of the first annular groove; the movable ring is connected with the side, away from the bearing box, of the static ring, at least one second annular groove is formed in the connecting face of the inner ring of the movable ring and the rotating shaft, and the distance between the groove bottom of the second annular groove and the rotating shaft is gradually increased from the interior to the exterior of the bearing box; and the second sealing ring falls into the groove bottom of the second annular groove. By arranging the inclined annular groove, the contact area between the first sealing ring and the annular groove and the contact area between the second sealing ring and the annular groove are increased when the first sealing ring and the second sealing ring are pressed, the volume ratio pressed into the fit clearance is reduced as much as possible, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing isolators, in particular to a labyrinth bearing isolator suitable for internal and external pressure differences. Background Art

[0002] The bearing isolator is a permanent bearing protection device. It consists of a moving ring and a stationary ring. The two parts are combined into one, so they will not separate during operation. The moving ring rotates with the shaft, and the stationary ring is pressed into the bearing box and fixed. The moving ring and the stationary ring cooperate with each other to prevent external impurities from entering the bearing box and prevent the lubricating medium from leaking.

[0003] In engineering applications, due to the pressure difference between the inside and outside of the bearing box, the seal in the bearing isolator is over-extended to the assembly gap, and is deformed by long-term stress, which greatly reduces the service life of the bearing isolator and causes leakage of the bearing box lubricating oil. Utility Model Content

[0004] The utility model aims to provide a labyrinth bearing isolator suitable for internal and external pressure difference, so as to solve the problem of failure of the seal of the labyrinth bearing isolator due to the pressure difference between the inside and outside of the bearing box in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A labyrinth bearing isolator suitable for internal and external pressure difference, comprising:

[0007] A stationary ring, the stationary ring is arranged close to the inside of the bearing box, the outer ring of the stationary ring and the connecting surface of the bearing box are provided with at least one first annular groove, and the distance between the groove bottom of the first annular groove and the rotating shaft gradually decreases from the inside to the outside of the bearing box;

[0008] A first sealing ring, wherein the first sealing ring falls into the bottom of the first annular groove and abuts against the bearing box;

[0009] A dynamic ring, the dynamic ring is engaged with a side of the static ring away from the bearing box, the inner ring of the dynamic ring and the connecting surface of the rotating shaft are provided with at least one second annular groove, and the distance between the groove bottom of the second annular groove and the rotating shaft gradually increases from the inside to the outside of the bearing box;

[0010] The second sealing ring falls into the bottom of the second annular groove, and the second sealing ring abuts against the rotating shaft.

[0011] Furthermore, a compensating sealing chamber, an outer labyrinth channel connecting the compensating sealing chamber with the outside world, and an inner labyrinth channel connecting the compensating sealing chamber with the inside of the bearing box are defined between the dynamic ring and the static ring; and a compensating sealing ring is also included, which is located in the compensating sealing chamber to seal between the outer labyrinth channel and the compensating sealing chamber and between the inner labyrinth channel and the compensating sealing chamber.

[0012] Furthermore, the outer ring of the dynamic ring has an outer step groove, and a raised ring facing the stationary ring is arranged at the bottom of the outer step groove. The stationary ring has an inner step groove on the side close to the dynamic ring, and the bottom of the inner step groove has an annular space. The raised ring is located in the annular space to define a compensating sealing cavity. The outer step groove cooperates with the inner step groove to define an outer labyrinth channel, and the outer side of the bottom of the annular space and the inner side of the bottom of the raised ring define an inner labyrinth channel.

[0013] Furthermore, the head end of the raised ring has a circle of limiting columns arranged toward the bottom of the compensation sealing cavity, a limiting groove is formed between the limiting columns and the raised ring, and the compensation sealing ring abuts against the limiting groove.

[0014] Furthermore, the compensation sealing ring includes a first sealing lip, a second sealing lip and a root; the root abuts against the inner wall of the raised ring so that the compensation sealing ring rotates with the dynamic ring, one end of the first sealing lip is connected to the root, and the other end thereof is dynamically sealed between the outer labyrinth channel and the compensation sealing chamber, and one end of the second sealing lip is connected to the root, and the other end thereof is dynamically sealed between the inner labyrinth channel and the compensation sealing chamber.

[0015] Furthermore, the root of the compensation sealing ring includes a first contact foot and a second contact foot that are connected as one body; the outer side of the first contact foot abuts against the limit column, the outer side of the second contact foot abuts against the dynamic ring, and the first sealing lip and the second sealing lip are both connected to the first contact foot.

[0016] Furthermore, an included angle of 90° to 180° is formed between the first sealing lip and the first contact leg, and an included angle of less than 90° is formed between the second sealing lip and the second contact leg.

[0017] Furthermore, the inner ring of the stationary ring has a spiral oil return groove.

[0018] Furthermore, a guide groove connected to the bearing box is provided at the bottom of the inner ring of the static ring, and the distance between the bottom of the guide groove and the rotating shaft gradually decreases from the inside to the outside of the bearing box.

[0019] Furthermore, it also includes a bottom drain port, which is opened at the bottom of the outer maze channel.

[0020] The utility model has the following advantages over the prior art:

[0021] 1. The utility model is suitable for labyrinth bearing isolators with internal and external pressure differences, and is designed to avoid the phenomenon that when the internal pressure of the bearing box increases, the first sealing ring and the second sealing ring are over-extruded to the assembly gap. The bottom of the groove containing the sealing ring is tilted, that is, the distance between the bottom of the first annular groove and the rotating shaft gradually decreases from the inside to the outside of the bearing box, and the distance between the bottom of the second annular groove and the rotating shaft gradually increases from the inside to the outside of the bearing box (the principle is that the bottom of the annular groove is tilted from the high-pressure side to the low-pressure side), so as to form a groove that is approximately V-shaped. This setting increases the contact area between the first and second sealing rings and the annular groove when under pressure, reduces the volume ratio of the pressed-in fitting gap as much as possible, and extends the service life. At the same time, the first and second sealing rings will fall into the V-shaped groove during assembly, which plays a good pre-tightening role.

[0022] 2. The utility model is a labyrinth bearing isolator suitable for internal and external pressure differences. In order to prevent the lubricating oil in the bearing box from being brought to the inner cavity of the compensating seal due to the rotation of the dynamic ring, the dynamic ring is arranged to be close to the outside (the side of the static ring away from the bearing box), and the static ring is arranged to be close to the inside (close to the inside of the bearing box). While ensuring the effectiveness of the bearing isolator, the splashing of oil inside the bearing box is further reduced. At this time, since the dynamic ring is placed outside, some of the water and dust from the outside will be thrown out of the bearing isolator through the outer labyrinth channel, but some will still accumulate in the outer labyrinth channel. By adding a bottom drain port on the static ring side of the outer labyrinth channel, the water and dust in the compensating seal cavity and the outer labyrinth channel can be effectively discharged.

[0023] 3. The utility model is suitable for the labyrinth bearing isolator with internal and external pressure difference. In order to prevent the phenomenon of water vapor being sucked back into the bearing box when the internal pressure of the bearing box drops, the sealing form of the compensating seal ring is symmetrically processed, and the compensating seal ring is set to a Y-shaped lip with a first sealing lip and a second sealing lip, wherein the first sealing lip is dynamically sealed between the outer labyrinth channel and the compensating seal cavity to prevent external water vapor from being sucked back, and the second sealing lip is dynamically sealed between the inner labyrinth channel and the compensating seal cavity to prevent internal oil mist from leaking out. By setting up double seals, the sealing effect is improved.

[0024] 4. The utility model is suitable for the labyrinth bearing isolator with internal and external pressure difference. It is inevitable that oil will accumulate between the inner labyrinth channel and the second sealing lip during operation. In order to help the accumulated oil to flow back to the inside of the bearing box in time, a spiral oil return groove is added to the inner ring of the static ring. This provides more oil return paths for the oil on the basis of the annular oil return groove (circumferential reflux) in the prior art (adding an axial oil return path pointing to the inside of the bearing box, and circumferential reflux and axial reflux are carried out simultaneously). A guide groove is also added to the bottom of the static ring. The distance between the bottom of the guide groove and the rotating shaft gradually decreases from the inside to the outside of the bearing box to ensure that the excess oil inside can flow back to the bearing box smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of a labyrinth bearing isolator suitable for internal and external pressure difference in an embodiment of the utility model;

[0026] Figure 2 It is a cross-sectional schematic diagram of a labyrinth bearing isolator suitable for internal and external pressure difference in an embodiment of the utility model;

[0027] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;

[0028] Figure 4 It is a schematic diagram of the use state of the labyrinth bearing isolator suitable for internal and external pressure difference in the embodiment of the utility model;

[0029] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0030] Figure 6 It is a schematic diagram of the structure of the compensating seal ring in the embodiment of the utility model.

[0031] In the figure: 1. bearing isolator; 2. bearing box; 3. rotating shaft; 4. stationary ring; 5. first annular groove; 6. first sealing ring; 7. moving ring; 8. second annular groove; 9. second sealing ring; 10. compensating sealing chamber; 11. outer labyrinth channel; 12. inner labyrinth channel; 13. compensating sealing ring; 14. outer step groove; 15. raised ring; 16. inner step groove; 17. annular space; 18. first sealing lip; 19. second sealing lip; 20. root; 21. first contact foot; 22. second contact foot; 23. limiting column; 24. spiral oil return groove; 25. guide groove; 26. bottom drain outlet. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that, in the description of the present invention, the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, it should be understood that for the convenience of description, the sizes of various components shown in the drawings are not drawn according to the actual proportional relationship.

[0035] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not need to be further discussed and described in detail in the description of the subsequent drawings.

[0036] Example:

[0037] like Figures 1 to 5 The labyrinth bearing isolator 1 suitable for internal and external pressure difference shown in the figure includes: a stationary ring 4, which is arranged close to the inside of the bearing box 2, and two first annular grooves 5 are arranged on the connecting surface between the outer ring of the stationary ring and the bearing box, and the distance between the bottom of the first annular groove 5 and the rotating shaft 3 gradually decreases from the inside to the outside of the bearing box 2; a first sealing ring 6 is placed in the first annular groove 5, because the bottom of the first annular groove 5 is inclined, the first sealing ring 6 just falls into the bottom of the bottom of the groove, and the first sealing ring 6 abuts against the bearing box 2. The stationary ring is sealed and connected to the inside of the bearing box through the first sealing ring 6 to prevent leakage between the stationary ring 4 and the bearing box 2, and at the same time prevent external water vapor from entering the bearing box. The first sealing ring 6 abuts against the bearing box 2 to ensure that the stationary ring 4 is squeezed into the bearing box 2 and fixedly connected to the bearing box 2. In this embodiment, the stationary ring 4 is fixed in the bearing box 2 by squeezing the first sealing ring 6, and a quick-disassembly and quick-assembly installation method is designed, which is different from the prior art using fixing methods such as bolts or fixing rings, and effectively improves the disassembly and assembly efficiency of the stationary ring 4.

[0038] It also includes a dynamic ring 7, which is engaged with a side of the stationary ring 4 away from the bearing housing (see Figure 4 and Figure 5The moving ring is installed on the outside of the static ring), and the connecting surface between the inner ring of the moving ring and the rotating shaft is provided with two second annular grooves 8, and the distance between the bottom of the second annular groove 8 and the rotating shaft 3 gradually increases from the inside to the outside of the bearing box 2; a second sealing ring 9 is provided at the bottom of the second annular groove 8, and because the bottom of the second annular groove 8 is inclined, the second sealing ring 9 just falls into the bottom of the bottom of the groove, and the second sealing ring abuts against the rotating shaft 3, and the moving ring and the rotating shaft are sealed by the second sealing ring 9 to prevent leakage between the moving ring and the rotating shaft, and the second sealing ring 9 abuts against the rotating shaft 3, which can ensure that the moving ring 7 is fixedly connected to the rotating shaft 3 and rotates with the rotating shaft 3. In this embodiment, the moving ring 7 is connected to the rotating shaft 3 by squeezing the second sealing ring 9, and a quick-disconnect and quick-install installation method is designed, which is different from the fixing methods such as bolts or fixing rings in the prior art, and effectively improves the disassembly and assembly efficiency of the moving ring.

[0039] When the bearing box 2 is working, the bearing temperature rises. At this time, the internal pressure of the bearing box will be higher than the external pressure. The sealing rings of the dynamic ring and the static ring of the bearing isolator are deformed by force, forcing them to squeeze into the assembly gap. In the long run, the sealing rings fail prematurely, the service life is reduced, and the maintenance cost is increased. The utility model tilts the bottom of the groove containing the sealing ring, that is, the distance between the bottom of the first annular groove 5 and the rotating shaft 3 gradually decreases from the inside to the outside of the bearing box 2, and the distance between the bottom of the second annular groove 8 and the rotating shaft 3 gradually increases from the inside to the outside of the bearing box 2 (the principle is that the bottom of the annular groove is tilted from the high-pressure side to the low-pressure side), thereby increasing the contact area between the first and second sealing rings and the annular grooves when under pressure, and reducing the volume ratio of the pressed-in fitting gap as much as possible, thereby extending the service life. At the same time, the first and second sealing rings will fall into the bottom of the inclined groove bottom during assembly, which plays a good pre-tightening role. In this embodiment, the number of the first annular groove 5, the first sealing ring 6, the second annular groove 8 and the second sealing ring 9 are all two. In actual use, the number of the above components can be adjusted according to actual conditions to ensure sealing and tight connection.

[0040] The dynamic ring of most bearing isolators on the market is located close to the bearing box and is in direct contact with the lubricating oil. When the equipment is running, a small amount of lubricating oil will be brought to the inner cavity of the compensation seal of the bearing isolator by the dynamic ring. Over time, the burden of the compensation seal is increased and the risk of leakage is increased. In this embodiment, the dynamic ring 7 is set to be close to the outside (located on the side of the static ring away from the bearing box), and the static ring 4 is set to be close to the inside (close to the bearing box). While ensuring the effectiveness of the bearing isolator, the splash of oil inside the bearing box is further reduced.

[0041] The dynamic ring 7 and the static ring 4 define a compensation seal cavity 10, an outer labyrinth channel 11 that connects the compensation seal cavity 10 with the outside, and an inner labyrinth channel 12 that connects the compensation seal cavity 10 with the inside of the bearing box 2; the inner and outer labyrinth channels can cause the internal lubricating oil and external water vapor and dirt to generate vortices in the labyrinth channel, resulting in a throttling effect, reducing the probability of directly entering the supplementary seal cavity. A compensation seal ring 13 is also included, which is located in the compensation seal cavity 10 to seal between the outer labyrinth channel 11 and the compensation seal cavity 10 and between the inner labyrinth channel 12 and the compensation seal cavity 10, thereby preventing the inside of the bearing box and the external medium from leaking into each other.

[0042] like Figure 3 and Figure 5 As shown, the outer ring of the moving ring 7 has an outer step groove 14, and the bottom of the outer step groove 14 is provided with a raised ring 15 facing the stationary ring. The stationary ring 4 has an inner step groove 16 on the side close to the moving ring 7, and the bottom of the inner step groove 16 has an annular space 17. The raised ring 15 is located in the annular space 17 to define a compensation seal cavity 10. The outer step groove 14 cooperates with the inner step groove 16 to define an outer labyrinth channel 11, and the bottom outer side of the annular space 17 and the bottom inner side of the raised ring 15 define an inner labyrinth channel 12. In this embodiment, the outer step groove is arranged at a right angle and the inner step groove is arranged at an obtuse angle. In actual use, it can also be designed as a step with other angles, such as 45°, 120°, etc., as long as the labyrinth return channel is satisfied.

[0043] The head end of the raised ring 15 has a circle of limiting columns 23 arranged toward the bottom of the compensation sealing cavity 10, and a limiting groove is formed between the limiting columns 23 and the raised ring 15, and the compensation sealing ring 13 abuts against the limiting groove. By providing the limiting groove, the position of the compensation sealing ring 13 can be better limited to prevent it from shifting in the process of following the rotation of the dynamic ring 7, thereby ensuring the sealing effect.

[0044] like Figure 2 , Figure 3 and Figure 6 As shown, the compensating sealing ring 13 includes a first sealing lip 18, a second sealing lip 19 and a root 20; the root 20 abuts against the inner wall of the raised ring 15 so that the compensating sealing ring 13 rotates with the moving ring 7, one end of the first sealing lip 18 is connected to the root 20, and the other end thereof contacts the inner wall of the annular space 17 to achieve sealing between the outer labyrinth channel 11 and the compensating sealing chamber 10, and one end of the second sealing lip 19 is connected to the root 20, and the other end thereof contacts the inner wall of the annular space 17 to achieve sealing between the inner labyrinth channel 12 and the compensating sealing chamber 10.

[0045] Most of the compensating seals between the dynamic ring and the static ring of the bearing isolator on the market only consider one-way prevention, and do not consider the situation where external water vapor is sucked back into the bearing box. When the equipment is shut down, the bearing temperature drops. At this time, the external pressure of the bearing box will be higher than the internal pressure, and water vapor will be sucked back into the bearing box, causing the lubricating oil to emulsify and reducing the service life of the bearing. Therefore, in this embodiment, the compensating seal ring is configured as a Y-shaped lip with a first sealing lip 18 and a second sealing lip 19, wherein the first sealing lip 18 is dynamically sealed between the outer labyrinth channel 11 and the compensating seal cavity 10 to prevent external water vapor from being sucked back, and the second sealing lip 19 is dynamically sealed between the inner labyrinth channel 12 and the compensating seal cavity 10 to prevent internal oil mist from leaking out. When the bearing box is working, the first sealing lip 18 and the second sealing lip 19 are both in friction contact with the surface of the static ring (the inner wall of the annular space), so the compensating seal ring is made of wear-resistant material.

[0046] The root of the compensation seal ring 13 includes a first contact foot 21 and a second contact foot 22 connected as one body; the outer side of the first contact foot 21 abuts against the limit column 23, the outer side of the second contact foot 22 abuts against the dynamic ring 7, and the first sealing lip 18 and the second sealing lip 19 are both connected to the first contact foot 21. The first sealing lip 18 and the first contact foot 21 have an angle of 90° to 180°, and the second sealing lip 19 and the second contact foot 22 have an angle of less than 90°. By setting a certain angle, the compensation seal ring 13 is set in a Y shape, forming a double seal in the compensation seal cavity.

[0047] The inner ring of the static ring of the existing bearing isolator is provided with an annular oil return groove. When the oil in the inner cavity of the bearing isolator compensation seal accumulates, the oil has only one reflux channel, that is, it can only flow back to the bearing box in the circumferential direction. Excessive oil cannot flow back smoothly, which will increase the risk of leakage. The inner ring of the static ring 4 in this embodiment has a spiral oil return groove 24, which has circumferential and axial oil return channels, and provides more oil return paths for the oil on the basis of the annular oil return groove, so that the accumulated oil in the compensation seal inner cavity can be returned to the inside of the bearing box in time.

[0048] The bottom of the inner ring of the stationary ring 4 is provided with a guide groove 25 connected to the bearing box 2, and the distance between the bottom of the guide groove 25 and the rotating shaft 3 gradually decreases from the inside to the outside of the bearing box 2. By providing the guide groove 25 inclined toward the inside of the bearing box 2, it is ensured that the excess oil thrown to the inner ring of the stationary ring can flow back smoothly.

[0049] It also includes a bottom drain port 26. The bottom drain port 26 is opened at the bottom of the outer labyrinth channel 11 to effectively drain water and dust from the outer cavity of the compensating seal.

[0050] The labyrinth bearing isolator suitable for internal and external pressure difference in this embodiment reduces the amount of O-ring pressed into the assembly gap when the internal pressure of the bearing box increases by setting an inclined first annular groove and a second annular groove, thereby increasing the service life of wearing parts and reducing equipment maintenance costs; by setting a Y-shaped compensating seal ring, the problem of external water vapor being sucked back through the compensating seal when the internal pressure of the bearing box decreases when the equipment is shut down is solved, thereby preventing the oil in the bearing box from emulsifying prematurely and extending the service life of the oil; by placing the moving ring outside and setting a bottom drain port, the cross-contamination caused by long-term accumulation of oil, water vapor, debris, etc. in the inner and outer cavities of the compensating seal is solved, and the leakage risk of the compensating seal is also reduced.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A labyrinth bearing isolator suitable for internal and external pressure difference, characterized in that: include: A stationary ring, the stationary ring is arranged close to the inside of the bearing box, the outer ring of the stationary ring and the connecting surface of the bearing box are provided with at least one first annular groove, and the distance between the groove bottom of the first annular groove and the rotating shaft gradually decreases from the inside to the outside of the bearing box; A first sealing ring, wherein the first sealing ring falls into the bottom of the first annular groove and abuts against the bearing box; A dynamic ring, the dynamic ring is engaged with a side of the static ring away from the bearing box, the inner ring of the dynamic ring and the connecting surface of the rotating shaft are provided with at least one second annular groove, and the distance between the groove bottom of the second annular groove and the rotating shaft gradually increases from the inside to the outside of the bearing box; The second sealing ring falls into the bottom of the second annular groove, and the second sealing ring abuts against the rotating shaft.

2. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 1, characterized in that: A compensation sealing chamber, an outer labyrinth channel connecting the compensation sealing chamber with the outside world, and an inner labyrinth channel connecting the compensation sealing chamber with the inside of the bearing box are defined between the dynamic ring and the static ring; a compensation sealing ring is also included, and the compensation sealing ring is located in the compensation sealing chamber to seal between the outer labyrinth channel and the compensation sealing chamber and between the inner labyrinth channel and the compensation sealing chamber.

3. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 2, characterized in that: The outer ring of the dynamic ring has an outer step groove, and a raised ring facing the static ring is arranged at the bottom of the outer step groove. The static ring has an inner step groove on the side close to the dynamic ring, and the bottom of the inner step groove has an annular space. The raised ring is located in the annular space to define a compensating sealing cavity. The outer step groove cooperates with the inner step groove to define an outer labyrinth channel, and the outer side of the bottom of the annular space and the inner side of the bottom of the raised ring define an inner labyrinth channel.

4. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 3, characterized in that: The head end of the raised ring has a circle of limiting columns arranged toward the bottom of the compensation sealing cavity, a limiting groove is formed between the limiting columns and the raised ring, and the compensation sealing ring abuts against the limiting groove.

5. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 3, characterized in that: The compensating sealing ring includes a first sealing lip, a second sealing lip and a root; the root abuts against the inner wall of the raised ring so that the compensating sealing ring rotates with the dynamic ring, one end of the first sealing lip is connected to the root, and the other end thereof is dynamically sealed between the outer labyrinth channel and the compensating sealing chamber, and one end of the second sealing lip is connected to the root, and the other end thereof is dynamically sealed between the inner labyrinth channel and the compensating sealing chamber.

6. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 5, characterized in that: The root of the compensation sealing ring includes a first contact foot and a second contact foot connected as one body; the outer side of the first contact foot abuts against the limit column, the outer side of the second contact foot abuts against the dynamic ring, and the first sealing lip and the second sealing lip are both connected to the first contact foot.

7. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 6, characterized in that: An included angle between the first sealing lip and the first contact leg is 90° to 180°, and an included angle between the second sealing lip and the second contact leg is less than 90°.

8. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 1, characterized in that: The inner ring of the stationary ring is provided with a spiral oil return groove.

9. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 1, characterized in that: A guide groove connected to the bearing box is arranged at the bottom of the inner ring of the static ring, and the distance between the bottom of the guide groove and the rotating shaft gradually decreases from the inside to the outside of the bearing box.

10. The labyrinth bearing isolator suitable for internal and external pressure difference according to claim 2, characterized in that: It also includes a bottom drain port, which is opened at the bottom of the outer labyrinth channel.

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