CN106168255B - Taper roller formula eliminates the protection bearing arrangement of rotor footpath axial gap simultaneously - Google Patents

Abstract

The invention discloses a tapered roller protective bearing device for simultaneously eliminating radial and axial gaps of a rotor, which comprises a rotor, a protective bearing, a bearing cover, screws and a bearing seat. The end of the rotor is processed into a tapered slope; the wedge-shaped circular plate is two left and right pieces, which are placed axially outside the ring connector and installed on the inner ring of the rolling bearing in an interference fit manner. The inner peripheral surface of the wedge-shaped circular plate is set It is a repeated arc segment corresponding to the number of tapered rollers. The radial distance L2 between each arc segment and the center of the device gradually decreases from the middle to both ends; the positioning cylinder is installed on the inner ring of the rolling bearing; the tapered roller and the rotor slope The direction is reversed; the outer surface of the roller shaft is in contact with the inner surface of the wedge-shaped circular plate. The invention can eliminate the radial and axial gap between the rotor and the tapered roller, eliminate the radial and axial gap between the rotor and the rolling bearing, eliminate the vibration and impact on the rolling bearing after the high-speed rotor falls, and meet the requirements of the high-speed magnetic suspension bearing system development needs.

Description

Tapered roller type protective bearing device that simultaneously eliminates the radial and axial clearance of the rotor

technical field

The invention relates to the technical field of magnetic suspension bearing systems, in particular to a tapered roller type protective bearing device which simultaneously eliminates radial and axial clearances of rotors.

Background technique

In the magnetic suspension bearing system, a set of protective bearings (also known as auxiliary bearings, spare bearings, holding bearings or emergency bearings) is generally required as a temporary support in case of system power failure, overload, control system failure or failure. The tapered roller type automatically eliminates the centripetal thrust protection bearing of the rotor gap, which can bear the load in the radial direction and the axial direction at the same time, so as to ensure that the high-speed rotating rotor does not collide with and rub against the stator part of the system, so as to ensure the safety and reliability of the entire system sex. The traditional protective bearing design is generally to assemble the rolling bearing in the bearing housing. The radial/axial clearance required for the normal operation of the magnetic suspension bearing provided between the inner ring of the rolling bearing and the rotor is generally the diameter of the rotor and the radial/axial magnetic suspension bearing. halfway to the gap. Therefore, the protective bearing is subject to great shock and vibration when it is working. At the same time, because the gap between the protective bearing and the rotor cannot be eliminated after the rotor falls, the protective bearing has poor ability to resist shock and vibration, which is easy to cause damage to it, resulting in magnetic suspension bearings. Serious accidents involving system damage. Therefore, protecting the bearing has always been the main factor restricting the application and development of the magnetic suspension bearing system.

Since the rotational speed of the magnetic suspension bearing system is generally very high, and there is a large radial gap between the rotor and the protective bearing, the rotor will generate a large shock and vibration when it falls onto the protective bearing. At present, there is a method of covering the circumference of the rotor assembly with rolling bearings, and after the rotor assembly falls, the movement of the surrounding rolling bearings can eliminate the clearance, but its structure is very complicated, and it can only eliminate the radial clearance, but cannot eliminate the axial clearance, and Since the diameter of the rotor is much larger than that of the peripheral rolling bearing, the rotation speed of the peripheral rolling bearing after falling is far greater than its own limit speed, and the problem is not fundamentally solved.

At present, there is no protective bearing device that can completely eliminate the radial and axial clearances of the rotor at the same time.

Contents of the invention

In order to overcome the deficiencies of the existing technology, the invention provides a protective bearing device of the tapered roller type and simultaneously eliminates the radial and axial clearance of the rotor.

The technical solution adopted by the present invention to solve the technical problem is: a tapered roller-type protective bearing device for simultaneously eliminating radial and axial clearances of the rotor, including a rotor, a radial protective bearing, a bearing gland, screws and a bearing seat, and the bearing pressure The cover is fixedly connected with the bearing seat through screws, axially compresses the radial protection bearing, and the bearing seat is fixedly connected with the outer frame;

The radial protection bearing includes tapered rollers, annular connectors, elastic supports, guide grooves, wedge-shaped discs, positioning cylinders, and rolling bearings;

In the annular connecting piece, guide grooves corresponding to the number of tapered rollers are evenly arranged in the annular connecting piece along the circumferential direction;

The elastic support member is arranged between each guide groove in the annular connector and the tapered roller shaft, and can allow the radial displacement of the tapered roller;

As for the rolling bearing, the outer ring of the rolling bearing is installed in the bearing housing and axially compressed by the bearing gland;

For the rotor, the end of the rotor is processed into a slope with a taper;

The wedge-shaped circular plate consists of two left and right pieces, which are axially placed on the outside of the annular connector and installed on the inner ring of the rolling bearing in an interference fit manner. Arc segment, the radial distance L2 between each arc segment and the center of the device gradually decreases from the middle to both ends;

The positioning cylinder is placed at the axial middle position of the two wedge-shaped circular plates, and is installed on the inner ring of the rolling bearing in an interference fit with the wedge-shaped circular plates. The width of the positioning cylinder is slightly larger than the width of the annular connector;

The taper of the tapered roller is the same as the taper of the rotor end, but it is placed opposite to the direction of the rotor slope, and there is a uniform gap L1 between the tapered roller and the surface of the rotor end in the axial direction; in addition, the tapered roller The roller consists of more than two tapered roller splits, and each tapered roller split is distributed in the guide groove set in the annular connector through the roller shafts arranged at both ends; at the same time, the outer circular surface of the roller shaft and the wedge-shaped circular plate internal surface contact.

According to another embodiment of the present invention, it further includes that there are 2-200 tapered rollers.

According to another embodiment of the present invention, it further includes that the rolling bearing is a deep groove ball bearing, or a pair of angular contact bearings.

According to another embodiment of the present invention, it further includes that the elastic support member is an independent spring element, or a structure that is integrated with the ring-shaped connecting member and processed by a process such as wire cutting.

According to another embodiment of the present invention, it further includes that the bearing gland is in the shape of a disk, and the disk is provided with a circle of screw holes along the circumference, and the bearing gland is pressed on the joint between the bearing seat and the rolling bearing.

According to another embodiment of the present invention, it further includes that the radial protection bearing material is a composite material made of metal or carbon fiber/glass fiber.

The beneficial effect of the present invention is that the present invention can simultaneously provide radial and axial protection to the forward/reverse rotor after the failure of the magnetic suspension bearing system, and can eliminate the radial and axial gaps between the rotor and the tapered rollers , which is equivalent to eliminating the radial and axial clearance between the rotor and the rolling bearing, thereby eliminating the vibration and impact on the rolling bearing after the high-speed rotor falls, and improving the reliability and safety of the centripetal thrust protection bearing to meet The need for the development of high-speed magnetic suspension bearing system.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a structural schematic diagram of a tapered roller type protective bearing device which simultaneously eliminates the radial and axial clearance of the rotor according to the present invention.

Fig. 2 is a sectional view of A-A at the rotor in Fig. 1 .

Fig. 3 is an enlarged view of part I in Fig. 2 .

In the figure, 1. rotor, 2. annular connector, 3. elastic support, 4. guide groove, 5. tapered roller, 51. split tapered roller, 52. roller shaft, 6. wedge-shaped circular plate, 7. Positioning cylinder, 8. Rolling bearing, 9. Bearing gland, 10. Screw, 11. Bearing seat.

Detailed ways

The accompanying drawings disclose, without limitation, the structural schematic diagrams of the preferred embodiments involved in the present invention; the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 3, a tapered roller-type protective bearing device that simultaneously eliminates radial and axial clearances of the rotor includes a rotor 1, a radial protective bearing, a bearing cover 9, a screw 10, and a bearing seat 11. The cover 9 is fixedly connected with the bearing seat 11 through the screw 10, axially compresses the radial protection bearing, and the bearing seat 11 is fixedly connected with the external machine base. Specifically, the bearing gland 9 is disc-shaped, and the bearing gland 9 is pressed against the joint between the bearing seat 11 and the rolling bearing 9 .

The radial protection bearing includes a tapered roller 5 , an annular connector 2 , an elastic support 3 , a guide groove 4 , a wedge-shaped disc 6 , a positioning cylinder 7 , and a rolling bearing 8 . All radial protection bearing materials are metal or composite materials made of carbon fiber/glass fiber.

in,

The annular connecting piece 2 is uniformly provided with guide grooves 4 corresponding to the number of tapered rollers 5 along the circumferential direction.

The elastic supporting member 3 is arranged between each guide groove 4 in the annular connecting member 2 and the tapered roller shaft 5 , allowing the radial displacement of the tapered roller 5 . The elastic support member 8 is an independent spring element, or a structure that is integrated with the ring connector and processed by wire cutting and other processes.

The rolling bearing 8 and the outer ring of the rolling bearing 8 are installed in the bearing housing 11, and are axially compressed by the bearing gland 9. The rolling bearing 8 is a deep groove ball bearing, or a pair of angular contact bearings.

The rotor 1, the end of the rotor 1 is processed into a tapered slope.

The wedge-shaped circular plate 6 consists of two left and right pieces, which are placed axially on the outside of the annular connector 6 and installed on the inner ring of the rolling bearing 8 in an interference fit manner. Corresponding to the repeated arc segment H1, the radial distance L2 between each arc segment and the center of the device gradually decreases from the middle to both ends.

The positioning cylinder 7 is placed in the axial middle position of the two wedge-shaped circular plates, and is installed on the inner ring of the rolling bearing 8 in an interference fit with the wedge-shaped circular plates. The width of the positioning cylinder 7 is slightly larger than that of the annular connector 2. width.

Tapered roller 5, the taper of the tapered roller 5 is the same as the taper of the rotor end, but it is placed opposite to the direction of the slope of the rotor 1, and there is a uniform gap L1 between the tapered roller 5 and the end surface of the rotor 1 along the axial direction; in addition , the tapered roller 5 includes more than two tapered roller splits 51, and each tapered roller split 51 is distributed in the guide groove 4 provided in the annular connector 2 through the roller shafts 52 provided at both ends; at the same time, the rolling The outer surface of the sub-shaft 52 is in contact with the inner surface of the wedge-shaped circular plate 6 . The number of tapered roller splits 51 is 2-200.

When the magnetic suspension bearing works normally, the annular connecting piece 2 and the elastic supporting piece 3 make all the tapered rollers 5 split in the middle of the arc section of the inner surface of the wedge-shaped circular plate 6 at all times, that is, the tapered roller 5 splits shown in Figure 2 At position A: There is a uniform gap between the inner circles of all tapered rollers 5 and the inclined surface at the end of the rotor 1, so that the protective bearing device does not interfere with the normal rotation of the rotor 1. In addition, in order to make the gaps between all the tapered roller 5 splits and the rotor 1 even and equal, it must be ensured that each tapered roller 5 splits and the rotor 1 are concentrically arranged during installation, that is, the rolling bearing 8, the wedge-shaped disc 6, the conical The centers of the rollers 5 and the rotor 1 are on the same straight line.

In addition, in this embodiment, the ring-shaped connector used is a ring-shaped connecting rod, and the elastic support used is a spring or an elastic body integrated with the ring-shaped connector and processed by wire cutting or other processes.

When the magnetic suspension bearing system works normally, the radial gap between the inner surface of the tapered roller 5 and the rotor 1 is about 0.15 mm, the two do not touch each other, and the rotor 1 rotates at high speed, the tapered roller 5 and the rolling bearing 8 Inner rings are in a static state together; when the magnetic suspension bearing fails, the rotor 1 falls, and the end of the rotor 1 contacts and collides with part of the tapered roller 5 splits, and the friction generated between the tapered roller 5 splits and the rotor 1 drives the cone The roller shafts at both ends of the roller 5 splits produce relative rolling on the inner peripheral surface of the wedge-shaped circular plate 6 along the rotor rotation direction. Since all the tapered rollers 5 splits are connected through the ring connector 2, all as long as there is one tapered roller The 5 splits and the wedge-shaped circular plate 6 produce relative rolling, and the roller shafts of the other tapered rollers 5 splits must produce the same relative rolling at the same time; The distance gradually decreases from the middle to both ends, so when the tapered roller 5 splits collide with the rotor 1, all the tapered rollers 5 splits move radially close to the center of the device, and this movement makes all the tapered rollers The gap between the 5 splits and the rotor 1 decreases rapidly. When all the 5 splits of the tapered rollers roll from the relative position A of the arc section on the inner surface of the wedge-shaped circular plate 6 to the position B, the 5 splits of the tapered rollers The gap between the rotor 1 and the rotor 1 is reduced to zero, thereby eliminating the gap between the rotor 1 and all the tapered rollers 5. Since the end of the rotor 1 has the same taper as the tapered roller 5 and is placed in the opposite direction, Therefore, when the gaps between the rotor 1 and all the tapered rollers 5 are eliminated to zero, it is equivalent to eliminating the radial and axial gaps between the rotor 1 and the inner ring of the rolling bearing 8 at the same time. Thus, the impact and vibration of the protective bearing after the rotor is dropped can be significantly improved, and the service life of the centripetal thrust protective bearing in the magnetic suspension bearing system can be significantly improved, and this device can prevent the rotor from falling in both clockwise and counterclockwise directions. To radial and axial protection at the same time.

The working principle of the present invention is:

During installation, use the elastic support member 3 acting on the tapered roller 5 split, so that the tapered roller 5 split is in the initial position (position A) of the inner surface of the wedge-shaped circular plate 6, and through the action of the ring connector 2, each Tapered roller 5 splits are all in this initial position. When the magnetic suspension bearing system is in normal operation, all the tapered rollers 5 are always in the initial position, and are in a static state together with the wedge-shaped circular plate 6, the annular connector 2, the elastic support 3 and the inner ring of the rolling bearing 8. At this time, the rotor 1 There is a normal protection gap (generally about 0.15 mm) for the magnetic suspension bearing system between the tapered slope at the end and the tapered slope of each tapered roller. When the magnetic suspension bearing system fails, the rotor 1 falls and collides with part of the tapered rollers 5. At this time, there is a large relative speed between the rotor 1 and the tapered rollers 5, and there is a collision force on the other hand. The friction force generated by the collision force between the rotor 1 and the tapered roller 5 makes the roller shaft of the part of the tapered roller 5 separate on the inner surface of the wedge-shaped circular plate 6. 2, the roller shafts of other tapered rollers 5 splits will also produce the same rolling with respect to the wedge-shaped circular plate 6 at the same time. Since the inner peripheral surface of the wedge-shaped circular plate 6 is set as repeated circular arc segments corresponding to the number of tapered rollers 5, the radial distance between each circular arc segment and the center of the device gradually decreases from the middle to both ends, so the rotor 1 and After the tapered rollers 5 collide, all the tapered rollers 5 separate in the radial direction and move close to the center of the device. When the radial distance of the tapered rollers 5 rolling along the inner peripheral surface of the wedge-shaped circular plate 6 is equal to the size of the protection gap ( The tapered roller 5 rolls to the relative position B), that is, the gap between the rotor 1 and the tapered roller 5 is completely eliminated, which is equivalent to eliminating the radial and axial gap between the rotor 1 and the rolling bearing 8 at the same time. At this time, all the tapered rollers 5, together with the annular connecting piece 2 and the rolling bearing 8, are still rotating around the rotation center of the magnetic suspension bearing system when the magnetic suspension bearing system is working normally together with the rotor 1, that is, there will be no collision between the rotor and the protective bearing, and there will be no Repeated shocks and vibrations are produced on the protective bearing, which improves the service life of the protective bearing.

Claims (5)

1. A conical roller type protective bearing device capable of eliminating radial and axial gaps of a rotor at the same time comprises the rotor (1), a protective bearing, a bearing gland (9), a screw (10) and a bearing seat (11), wherein the bearing gland (9) is fixedly connected with the bearing seat (11) through the screw (10), the protective bearing is axially compressed, and the bearing seat (11) is fixedly connected with an external machine base;

the protective bearing comprises a tapered roller (5), an annular connecting piece (2), an elastic supporting piece (3), a guide groove (4), a wedge-shaped circular plate (6), a positioning cylinder (7) and a rolling bearing (8);

the annular connecting piece (2) is internally and uniformly provided with guide grooves (4) corresponding to the number of the tapered rollers (5) along the circumferential direction;

the elastic supporting piece (3) is arranged between each guide groove (4) in the annular connecting piece (2) and the tapered roller shaft (52) and can allow the radial displacement of the tapered roller (5);

the outer ring of the rolling bearing (8) is arranged in the bearing seat (11) and is axially compressed through the bearing gland (9);

it is characterized in that the utility model is characterized in that,

the end of the rotor (1) is processed into a tapered inclined plane;

the wedge-shaped circular plates (6) are arranged on the left and right sides, are axially arranged on the outer side of the annular connecting piece (2), and are arranged on the inner ring of the rolling bearing (8) in an interference fit manner, repeated arc sections H1 corresponding to the number of the tapered rollers (5) are arranged on the inner circumferential surface of each wedge-shaped circular plate (6), and the radial distance L2 between each arc section and the center of the device is gradually reduced from the middle to the two ends;

the positioning cylinder (7) is arranged at the axial middle position of the two wedge-shaped circular plates (6), is arranged on the inner ring of the rolling bearing (8) in an interference fit manner in accordance with the wedge-shaped circular plates (6), and the width of the positioning cylinder (7) is slightly larger than that of the annular connecting piece (2);

the taper of the tapered roller (5) is the same as that of the end part of the rotor (1), but the tapered roller is arranged in the direction opposite to the inclined plane direction of the rotor (1), and a gap L1 with uniform size exists between the tapered roller (5) and the end part surface of the rotor (1) along the axial direction; in addition, the tapered roller (5) comprises more than 2 tapered roller split bodies (51), and each tapered roller split body (51) is distributed in a guide groove (4) arranged in the annular connecting piece (2) through roller shafts (52) arranged at two ends; meanwhile, the outer circumferential surface of the roller shaft 52 on the radially outer side is in contact with the inner circumferential surface of the wedge disk 6.

2. A tapered roller type protective bearing device for simultaneously eliminating radial and axial clearances of a rotor according to claim 1, wherein: the number of the conical roller split bodies (51) is 2-200.

3. A tapered roller type protective bearing device for simultaneously eliminating radial and axial clearances of a rotor according to claim 1, wherein: the rolling bearing (8) is a deep groove ball bearing or a pair of angular contact bearings.

4. A tapered roller type protective bearing device for simultaneously eliminating radial and axial clearances of a rotor according to claim 1, wherein: the elastic supporting piece (3) is an independent spring element or a structure which is integrated with the annular connecting piece (2) and is processed by a wire cutting process.

5. A tapered roller type protective bearing device for simultaneously eliminating radial and axial clearances of a rotor according to claim 1, wherein: bearing gland (9) are discoid, and the disc is equipped with the round screw hole along the circumference, and bearing gland (9) are pressed in the seam crossing of bearing frame (11) and antifriction bearing (9).