CN118669429A - Sealed ball bearing resistant to atmospheric pressure working condition - Google Patents

Abstract

The present invention discloses a sealed ball bearing capable of withstanding atmospheric pressure working conditions, comprising an outer ring, an inner ring and a rolling element, a sealing structure being arranged on one side of the rolling element, the sealing structure being combined with the outer ring and the inner ring to form a rolling cavity for the rolling element to move, the sealing structure comprising an inner retaining ring and an outer retaining ring detachably arranged in the rolling cavity, the inner retaining ring and the outer retaining ring being arranged opposite to each other and a sealing groove being formed between the two, an inner sealing ring being arranged on the outer side wall of the inner retaining ring, an outer sealing ring being arranged on the inner side wall of the outer retaining ring, the inner sealing ring and the outer sealing ring being gap-matched and being combined with the sealing groove to form a labyrinth groove communicating with the rolling cavity, a driving member for adaptively driving the inner sealing ring to shift and close the labyrinth groove when the bearing is running at high speed and a sealing member for adaptively closing the connection between the sealing groove and the rolling cavity when the bearing is running at high speed being arranged on the inner retaining ring. The present invention solves the problem that the internal grease of a conventional bearing is easy to overflow the bearing with the air pressure under atmospheric pressure working conditions.

Description

Sealed ball bearings for atmospheric pressure

Technical Field

The invention relates to the technical field of bearings, and in particular to a sealed ball bearing capable of withstanding atmospheric pressure conditions.

Background Art

In special equipment compressors, standard-sized deep groove ball bearings are used. When used in air compressors, the bearings must withstand an air pressure of 2.5 MPa. In traditional bearings in air compressors, one side cooperates with the internal tooling of the air compressor to achieve sealing, while the other side remains open. Since there is an air pressure of 2.5 MPa passing through the bearings, the grease is blown away by the air pressure. The bearings fail in a short period of time due to lack of lubricating grease, causing the compressor to fail. If the bearings in traditional air compressors are replaced with bearings with a sealing structure, it will be difficult to add oil to the bearings, and the bearings need to be removed again, which leads to low oil replenishment efficiency.

Summary of the invention

In view of the deficiencies in the prior art, the present invention provides a sealed ball bearing that can withstand atmospheric pressure conditions, in order to solve the problem that the internal grease of traditional bearings is easily overflowed from the bearings due to the air pressure under atmospheric pressure conditions and that bearings with a sealing structure are difficult to add oil.

To achieve the above-mentioned purpose, the present invention provides a sealed ball bearing that can withstand atmospheric pressure conditions, including an outer ring, an inner ring and a rolling element, a sealing structure is arranged on one side of the rolling element, and the sealing structure is combined with the outer ring and the inner ring to form a rolling cavity for the rolling element to move, the sealing structure includes an inner retaining ring and an outer retaining ring that are detachably arranged in the rolling cavity, the inner retaining ring and the outer retaining ring are arranged opposite to each other and a sealing groove is formed therebetween, an inner sealing ring is arranged on the outer side wall of the inner retaining ring, and an outer sealing ring is arranged on the inner side wall of the outer retaining ring, the inner sealing ring and the outer sealing ring are gap-matched and combined with the sealing groove to form a labyrinth groove connected with the rolling cavity, the inner retaining ring is provided with a driving member for adaptively driving the inner sealing ring to shift and close the labyrinth groove when the bearing runs at high speed, and a sealing member for adaptively closing the connection between the sealing groove and the rolling cavity when the bearing runs at high speed.

The benefits of adopting the above technical solution are: in the above technology, a sealing structure is provided on one side of the rolling element, that is, one side of the bearing cooperates with external tooling to achieve sealing, and a sealing structure is installed on the other side, and a labyrinth groove is formed by the combination of the inner sealing ring, the outer sealing ring and the sealing groove, so that when the high-pressure gas flows through the rolling cavity, the probability of grease being brought out of the bearing by the high-pressure gas is greatly reduced, and the sealing member on the inner retaining ring is provided to adaptively drive the inner sealing ring to shift and close the driving member of the labyrinth groove when the bearing runs at high speed, and to adaptively close the connection between the sealing groove and the rolling cavity when the bearing runs at high speed, that is, the driving member closes the labyrinth groove when the bearing runs at high speed, and the sealing member adaptively closes the connection between the sealing groove and the rolling cavity, so as to achieve the closure of the labyrinth groove, thereby preventing grease from being brought out of the bearing by the high-pressure gas, and when the bearing is not running, the driving member and the sealing member are not adaptively started, so that outside personnel can add oil to the rolling cavity through the labyrinth groove, and it is convenient for disassembly and assembly.

The present invention further provides that: a deformation groove is annularly provided on the outer wall of the inner retaining ring, the driving member includes a deformation ring, the deformation ring is composed of a connecting portion and a bending portion, the connecting portion is embedded in the inner wall of the deformation groove, the end of the bending portion is connected to the connecting portion, the starting end of the bending portion is bent toward the inner sealing ring and connected to the inner side wall of the inner sealing ring, the inner sealing ring is movably arranged on the outer wall of the inner retaining ring, the deformation ring is made of shape memory alloy, the deformation ring has a first form in a first temperature range, and the deformation ring is in a first state. The deformable ring has a second form within a second temperature range. In the first form, the bending portion of the deformable ring drives the inner circumferential wall of the inner sealing ring to fit in the gap with the outer circumferential wall of the outer sealing ring, and the outer side wall of the inner sealing ring is gap-fitted with the inner side wall of the outer retaining ring. In the second form, the bending portion of the deformable ring is deformed and bent to drive the inner sealing ring to shift so that the inner circumferential wall of the inner sealing ring contacts the outer circumferential wall of the outer sealing ring, and the outer side wall of the inner sealing ring contacts the inner side wall of the outer retaining ring, and the inner side wall surface of the outer sealing ring is gap-fitted with the outer side wall surface of the inner retaining ring.

The above technical solution is beneficial in that: when the bearing is running at high speed, its internal temperature gradually rises, and the temperature gradually rises to above 35 degrees. At this time, the internal temperature range of the bearing is the second temperature range, and the deformation ring is made of shape memory alloy. The shape memory alloy will deform above 35 degrees and restore the deformation below 35 degrees. The deformation ring has a second form in the second temperature range, that is, the deformation of the bending portion of the deformation ring in the second form drives the inner sealing ring to shift so that the inner peripheral wall of the inner sealing ring contacts the outer peripheral wall of the outer sealing ring and the outer side wall of the inner sealing ring contacts the inner side wall of the outer retaining ring, thereby realizing the closure of the labyrinth groove, and then preventing high-pressure gas from passing through the bearing to drive the internal grease of the bearing to overflow to the outside of the bearing through the labyrinth groove when the bearing is running at high speed, thereby avoiding the inside of the bearing Lack of grease causes the bearing to run dry, thereby preventing the bearing from being damaged or scrapped due to dry running due to lack of oil. In the above technology, when the bearing stops running or is not running, the internal temperature of the bearing gradually decreases. At this time, the internal temperature range of the bearing is a first temperature range, and the deformation ring has a first form in the first temperature range. In the first form, the bending portion of the deformation ring drives the inner circumferential wall of the inner sealing ring and the outer circumferential wall of the outer sealing ring to match the gap, and the outer wall of the inner sealing ring and the inner wall of the outer retaining ring are matched with the gap, so that the operator can add oil to the inside of the bearing through the maze groove, and at the same time facilitate the disassembly and assembly of the bearing, thereby improving the bearing oil filling efficiency and disassembly and assembly efficiency; in the above technology, the deformation ring is made of shape memory alloy material, and the memory alloy material is a prior art, so its principle and function will not be described in detail.

The present invention further provides that: a sealing lip is bent on the inner peripheral wall of the inner retaining ring toward the outer peripheral wall of the inner ring, and the sealing lip is arranged near the connecting position of the rolling cavity and the labyrinth groove.

The benefit of adopting the above technical solution is that: in the above technology, the inner circumferential wall of the inner retaining ring is bent toward the outer circumferential wall of the inner ring to have a sealing lip and the sealing lip is arranged near the connection point between the rolling cavity and the labyrinth groove, thereby reducing the amount of grease driven by high-pressure gas to flow to the labyrinth groove through the bearing.

The present invention is further provided with: an oil supply ring is detachably provided on the side wall of the inner ring, an oil supply ring is provided with an oil storage cavity in an annular direction, the oil storage cavity is filled with solid grease, an oil through hole is provided on the inner ring, the oil through hole is connected to the outer peripheral wall of the inner ring and is connected to the rolling cavity, and an oil outlet hole for conducting with the oil through hole is provided on the oil storage cavity.

The benefits of adopting the above technical solution are: in the above technology, the oil replenishing ring can be detachably arranged in the oil storage cavity. When the bearing runs at high speed, the internal temperature of the bearing gradually increases, and the solid grease is partially converted into liquid grease and flows into the rolling cavity through the oil hole and the oil outlet hole, thereby replenishing the oil to the bearing.

The present invention further provides: the sealing lip is a sealing member, the sealing lip is composed of a sealing protrusion and a sealing rib, the sealing protrusion and the sealing rib are both made of shape memory alloy, the sealing rib has a third form in the first temperature range, the sealing rib has a fourth form in the second temperature range, the inner circumferential wall of the sealing rib is clearance-matched with the outer circumferential wall of the inner ring in the third form, the sealing rib is bent and deformed in the fourth form and abutted against the outer circumferential wall of the inner ring, the sealing protrusion has a fifth form in the first temperature range, the sealing protrusion has a sixth form in the second temperature range, the sealing protrusion is bent and deformed in the fifth form and abutted against the outer circumferential wall of the inner ring and blocks the oil hole opening, and the sealing protrusion is clearance-matched with the outer circumferential wall of the inner ring in the sixth form and exposed to the oil hole opening.

The advantages of adopting the above technical scheme are as follows: when the bearing is not running, the sealing rib has a third form within the first temperature range, that is, the inner circumferential wall of the sealing rib is in clearance with the outer circumferential wall of the inner ring in the third form, so as to facilitate the disassembly and assembly of the bearing; at the same time, the sealing protrusion has a fifth form within the first temperature range, and the sealing protrusion is bent and deformed in the fifth form to abut against the outer circumferential wall of the inner ring and seal the opening of the oil hole, so that when the bearing is not running, the grease in the oil storage cavity will not overflow excessively into the rolling cavity, resulting in excessive grease inside the rolling cavity; when the bearing is running at high speed, the sealing rib has a fourth form within the second temperature range, that is, the sealing rib is bent and deformed in the fourth form to abut against the outer circumferential wall of the inner ring, and the sealing The sealing convex point has a sixth form within the second temperature range. In the sixth form, the sealing convex point is matched with the clearance of the outer peripheral wall of the inner ring and is exposed at the opening of the oil hole, so that when the bearing runs at high speed, part of the grease inside the oil storage cavity can flow through the oil hole to the rolling cavity, thereby achieving oil replenishment and lubrication. At the same time, the sealing rib abuts against the inner ring to prevent grease from overflowing to the outside of the bearing through the labyrinth groove; in the above technology, the number of sealing convex points set is matched with the number of oil holes, and the corresponding number of oil holes can be opened according to actual production needs and installation needs; in the above technology, the sealing convex points and the sealing ribs are made of shape memory alloy material, and the shape memory alloy material is a prior art, so its principle and function will not be described in detail.

The present invention further provides that: the oil supply ring and the inner ring are detachably connected with connecting bolts.

The benefits of adopting the above technical solution are: in the above technology, the oil filler ring and the inner ring are detachably connected with connecting bolts to facilitate operators to assemble the oil filler ring, thereby improving the efficiency of disassembly and assembly. At the same time, when the grease inside the oil filler ring is exhausted, the oil filler ring can be removed and grease can be refilled into the oil filler ring or a new oil filler ring full of grease can be replaced, thereby replenishing the grease inside the bearing.

The present invention further provides that: a first groove is formed on the inner circumferential wall of the outer ring, the outer circumferential wall of the inner retaining ring is interference fit with the inner circumferential wall of the first groove, a second groove is formed on the outer circumferential wall of the inner ring, and the inner circumferential wall of the outer retaining ring is interference fit with the outer circumferential wall of the second groove.

The benefits of adopting the above technical solution are: in the above technology, the installation of the inner and outer retaining rings is facilitated by the interference fit between the inner retaining ring and the first slot and the interference fit between the outer retaining ring and the second slot, while the connection strength between the inner retaining ring and the first slot and the connection strength between the outer retaining ring and the second slot are improved.

The present invention further provides that: the interference range between the inner retaining ring and the first clamping groove and the interference range between the outer retaining ring and the second clamping groove are both 0.02-0.03 mm.

The benefit of adopting the above technical solution is that the interference range between the inner retaining ring and the first groove and the interference range between the outer retaining ring and the second groove are both 0.02-0.03mm, so that the inner retaining ring and the first groove are more closely fitted, and the outer retaining ring and the second groove are also more closely fitted, thereby improving the connection strength between the two.

The present invention further provides that: the gap between the inner sealing ring and the outer sealing ring ranges from 0.15 to 0.25 mm.

The benefit of adopting the above technical solution is that: in the above technology, the gap between the inner sealing ring and the outer sealing ring ranges from 0.15 to 0.25 mm, which limits the gap between the inner sealing ring and the outer sealing ring, thereby preventing grease from being brought out of the bearing when pressurized gas flows through.

The present invention further provides that: raceways for rolling of rolling bodies are relatively arranged on the outer circumferential wall of the inner ring and the inner circumferential wall of the outer ring, and the two raceways are eccentrically arranged.

The benefit of adopting the above technical solution is that the eccentric setting of the raceway causes the rolling element to be eccentrically set relative to the bearing, thereby increasing the space when one side of the bearing is open to facilitate the installation of the sealing structure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a simplified cross-sectional view of the present invention in a non-operating state;

FIG. 2 is a simplified cross-sectional view of the present invention in operation.

DETAILED DESCRIPTION

The present invention provides a sealed ball bearing capable of withstanding atmospheric pressure working conditions, comprising an outer ring 1, an inner ring 2 and a rolling element 11, wherein a sealing structure is arranged on one side of the rolling element 11, wherein the sealing structure is combined with the outer ring 1 and the inner ring 2 to form a rolling cavity 12 for the rolling element 11 to move, wherein the sealing structure comprises an inner retaining ring 3 and an outer retaining ring 4 which are detachably arranged in the rolling cavity 12, wherein the inner retaining ring 3 and the outer retaining ring 4 are arranged opposite to each other and a sealing groove is formed between the two, an inner sealing ring 31 is arranged on the outer side wall of the inner retaining ring 3, and a sealing groove is formed between the inner retaining ring 4 and the outer side wall of the outer retaining ring 4. An outer sealing ring 41 is arranged, the inner sealing ring 31 is matched with the outer sealing ring 41 in a clearance and combined with the sealing groove to form a labyrinth groove 32 connected to the rolling cavity 12, the inner retaining ring 3 is provided with a driving member for adaptively driving the inner sealing ring 31 to shift and close the labyrinth groove 32 when the bearing runs at a high speed, and a sealing member for adaptively closing the connection between the sealing groove and the rolling cavity 12 when the bearing runs at a high speed, a deformation groove 33 is annularly opened on the outer side wall of the inner retaining ring 3, and the driving member includes a deformation ring 5, and the deformation ring 5 consists of a connecting portion 51 and a curved portion. The bending portion 52 is composed of the connecting portion 51 embedded in the inner wall of the deformation groove 33, the end of the bending portion 52 is connected to the connecting portion 51, the starting end of the bending portion 52 is bent toward the inner sealing ring 31 and connected to the inner side wall of the inner sealing ring 31, the inner sealing ring 31 is movably arranged on the outer side wall of the inner retaining ring 3, the deformation ring 5 is made of shape memory alloy, the deformation ring 5 has a first form in the first temperature range, the deformation ring 5 has a second form in the second temperature range, and the deformation ring 5 is bent in the first form The portion 52 drives the inner circumferential wall of the inner sealing ring 31 to be gap-matched with the outer circumferential wall of the outer sealing ring 41, and the outer side wall of the inner sealing ring 31 is gap-matched with the inner side wall of the outer retaining ring 4. In the second form, the bending portion 52 of the deformable ring 5 is deformed and bent to drive the inner sealing ring 31 to shift so that the inner circumferential wall of the inner sealing ring 31 contacts the outer circumferential wall of the outer sealing ring 41, and the outer side wall of the inner sealing ring 31 contacts the inner side wall of the outer retaining ring 4. The inner side wall surface of the outer sealing ring 41 is gap-matched with the outer side wall surface of the inner retaining ring 3, and the inner side wall of the inner retaining ring 3 faces the outer side wall of the inner ring 2. The inner ring 2 is bent with a sealing lip, which is arranged near the connection between the rolling cavity 12 and the labyrinth groove 32. The inner ring 2 is detachably provided with an oil filling ring 6 on its side wall. The oil filling ring 6 is provided with an oil storage cavity 61 in an annular direction. The oil storage cavity 61 is filled with solid grease. The inner ring 2 is provided with an oil hole 62, which is connected to the outer peripheral wall of the inner ring 2 and is connected with the rolling cavity 12. The oil storage cavity 61 is provided with an oil outlet hole 63 for conducting with the oil hole 62. The sealing lip is a sealing member, and the sealing lip is provided with a sealing member. The sealing rib 34 is composed of a convex point and a sealing rib 34, both of which are made of shape memory alloy. The sealing rib 34 has a third form in the first temperature range, and the sealing rib 34 has a fourth form in the second temperature range. In the third form, the inner peripheral wall of the sealing rib 34 is gap-matched with the outer peripheral wall of the inner ring 2. In the fourth form, the sealing rib 34 is bent and deformed and abuts against the outer peripheral wall of the inner ring 2. The sealing convex point 35 has a fifth form in the first temperature range, and the sealing rib 34 has a fifth form in the second temperature range. The convex point 35 has a sixth form in the second temperature range. The sealing convex point 35 is bent and deformed in the fifth form to abut against the outer wall of the inner ring 2 and block the opening of the oil hole 62. The sealing convex point 35 is in the sixth form to match with the outer wall of the inner ring 2 and expose the opening of the oil hole 62. The oil supplement ring 6 and the inner ring 2 are detachably connected with a connecting bolt 64. The inner wall of the outer ring 1 is provided with a first groove 13. The outer wall of the inner retaining ring 3 is interference-fitted with the inner wall of the first groove 13. The inner ring 2, a second groove 21 is provided on the outer peripheral wall, the inner peripheral wall of the outer retaining ring 4 is interference fit with the outer peripheral wall of the second groove 21, the interference range between the inner retaining ring 3 and the first groove 13 and the interference range between the outer retaining ring 4 and the second groove 21 are both 0.02-0.03mm, the gap range between the inner sealing ring 31 and the outer sealing ring 41 is 0.15-0.25mm, and the outer peripheral wall of the inner ring 2 and the inner peripheral wall of the outer ring 1 are both relatively provided with raceways 22 for rolling of the rolling body 11, and the two raceways 22 are eccentrically arranged.

The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention shall be defined by the attached claims and their equivalents.

Claims (10)

1. A sealed ball bearing capable of withstanding atmospheric pressure, comprising an outer ring (1), an inner ring (2) and a rolling element (11), wherein a sealing structure is arranged on one side of the rolling element (11), and the sealing structure is combined with the outer ring (1) and the inner ring (2) to form a rolling cavity (12) for the rolling element (11) to move, characterized in that: the sealing structure comprises an inner retaining ring (3) and an outer retaining ring (4) detachably arranged in the rolling cavity (12), the inner retaining ring (3) and the outer retaining ring (4) being arranged opposite to each other and a sealing groove being formed between the inner retaining ring (3) and the outer retaining ring (4) (3) An inner sealing ring (31) is arranged on the outer wall, and an outer sealing ring (41) is arranged on the inner wall of the outer retaining ring (4). The inner sealing ring (31) and the outer sealing ring (41) are loosely matched and combined with the sealing groove to form a labyrinth groove (32) connected to the rolling cavity (12). The inner retaining ring (3) is provided with a driving member for adaptively driving the inner sealing ring (31) to shift and close the labyrinth groove (32) when the bearing runs at a high speed, and a sealing member for adaptively closing the connection between the sealing groove and the rolling cavity (12) when the bearing runs at a high speed. 2. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 1, characterized in that: a deformation groove (33) is circumferentially provided on the outer wall of the inner retaining ring (3), the driving member comprises a deformation ring (5), the deformation ring (5) is composed of a connecting portion (51) and a bending portion (52), the connecting portion (51) is embedded in the inner wall of the deformation groove (33), the end of the bending portion (52) is connected to the connecting portion (51), the starting end of the bending portion (52) is bent toward the inner sealing ring (31) and is connected to the inner wall of the inner sealing ring (31), the inner sealing ring (31) is movably arranged on the outer wall of the inner retaining ring (3), the deformation ring (5) is made of shape memory alloy, and the deformation ring (5) is arranged at the first A first form exists within a temperature range, and the deformable ring (5) exists within a second temperature range. In the first form, the bending portion (52) of the deformable ring (5) drives the inner peripheral wall of the inner sealing ring (31) to be gap-matched with the outer peripheral wall of the outer sealing ring (41), and the outer peripheral wall of the inner sealing ring (31) is gap-matched with the inner peripheral wall of the outer retaining ring (4). In the second form, the bending portion (52) of the deformable ring (5) is deformed and bent to drive the inner sealing ring (31) to shift so that the inner peripheral wall of the inner sealing ring (31) is in contact with the outer peripheral wall of the outer sealing ring (41), and the outer peripheral wall of the inner sealing ring (31) is in contact with the inner peripheral wall of the outer retaining ring (4), and the inner side wall surface of the outer sealing ring (41) is gap-matched with the outer side wall surface of the inner retaining ring (3). 3. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 1, characterized in that: the inner peripheral wall of the inner retaining ring (3) is bent with a sealing lip toward the outer peripheral wall of the inner ring (2), and the sealing lip is arranged near the connection point between the rolling cavity (12) and the labyrinth groove (32). 4. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 3, characterized in that: an oil supply ring (6) is detachably provided on the side wall of the inner ring (2), the oil supply ring (6) is provided with an oil storage cavity (61) in an annular direction, the oil storage cavity (61) is filled with solid grease, an oil through hole (62) is provided on the inner ring (2), the oil through hole (62) is connected to the outer peripheral wall of the inner ring (2) and is connected to the rolling cavity (12), and the oil storage cavity (61) is provided with an oil outlet hole (63) for conducting with the oil through hole (62). 5. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 4, characterized in that: the sealing lip is a sealing member, the sealing lip is composed of a sealing convex point (35) and a sealing rib (34), the sealing convex point (35) and the sealing rib (34) are both made of shape memory alloy, the sealing rib (34) has a third form in the first temperature range, the sealing rib (34) has a fourth form in the second temperature range, and the inner peripheral wall of the sealing rib (34) in the third form is matched with the outer peripheral wall of the inner ring (2) The sealing rib (34) is bent and deformed in the fourth form and is abutted and matched with the outer peripheral wall of the inner ring (2); the sealing protrusion (35) has a fifth form in the first temperature range; the sealing protrusion (35) has a sixth form in the second temperature range; the sealing protrusion (35) is bent and deformed in the fifth form and abutted and matched with the outer peripheral wall of the inner ring (2) and is set to block the opening of the oil hole (62); the sealing protrusion (35) is gap-matched with the outer peripheral wall of the inner ring (2) in the sixth form and is set to expose the opening of the oil hole (62). 6. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 4, characterized in that a connecting bolt (64) is detachably connected between the oil supply ring (6) and the inner ring (2). 7. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 1, characterized in that: a first groove (13) is provided on the inner circumferential wall of the outer ring (1), the outer circumferential wall of the inner retaining ring (3) is interference fit with the inner circumferential wall of the first groove (13), a second groove (21) is provided on the outer circumferential wall of the inner ring (2), and the inner circumferential wall of the outer retaining ring (4) is interference fit with the outer circumferential wall of the second groove (21). 8. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 5, characterized in that the interference range between the inner retaining ring (3) and the first groove (13) and the interference range between the outer retaining ring (4) and the second groove (21) are both 0.02-0.03 mm. 9. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 1, characterized in that the gap between the inner sealing ring (31) and the outer sealing ring (41) is in the range of 0.15-0.25 mm. 10. A sealed ball bearing capable of withstanding atmospheric pressure conditions according to claim 1, characterized in that raceways (22) for rolling of the rolling elements (11) are arranged opposite to each other on the outer circumferential wall of the inner ring (2) and the inner circumferential wall of the outer ring (1), and the two raceways (22) are arranged eccentrically.