CN111059143B - Diamond radial bearing and manufacturing process thereof - Google Patents

Abstract

The present invention discloses a diamond radial bearing, wherein a plurality of first diamond composite sheets and a second diamond composite sheet are respectively distributed circumferentially on the outer circumferential surface of the inner ring of the bearing and the inner circumferential surface of the outer ring of the bearing, and the first diamond composite sheet and the second diamond composite sheet are fitted together, which can improve the wear resistance and impact resistance of the bearing and increase the service life of the bearing. A manufacturing process for a diamond radial bearing is also provided, wherein a plurality of through holes are machined radially on the inner circumferential surface of the outer ring of the bearing and the plurality of through holes are distributed circumferentially, and the second diamond composite sheet is welded in the through holes; a plurality of blind holes are machined radially on the outer circumferential surface of the inner ring of the bearing and the plurality of blind holes are distributed circumferentially, and a flux receiving groove is machined at the bottom of the blind hole, and the first diamond composite sheet is welded in the blind hole. During welding, the flux melts and flows into the flux receiving groove, which can improve the fixing strength of the first diamond composite sheet on the inner ring of the bearing.

Description

A diamond radial bearing and its manufacturing process

Technical Field

The invention relates to the technical field of downhole drilling tools, and in particular to a diamond radial bearing and a manufacturing process thereof.

Background Art

At present, radial ball bearings or radial cylindrical bearings are needed in oil drilling or geological exploration. Traditional ball bearings or cylindrical bearings are prone to breakage of balls or rollers when subjected to strong vibration and impact in the working environment of high temperature and mud at the bottom of the well, and are easily corroded by mud, which accelerates the wear of the bearings and reduces their service life.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a diamond radial bearing with good impact resistance and good wear resistance.

The present invention also provides a manufacturing process of the diamond radial bearing.

According to the first aspect of the present invention, a diamond radial bearing comprises a bearing inner ring, whose outer circumferential surface is circumferentially provided with a plurality of first diamond composite sheets, the first diamond composite sheets extending out of the outer circumferential surface; a bearing outer ring, whose inner circumferential surface is circumferentially provided with a plurality of second diamond composite sheets, the second diamond composite sheets extending out of the inner circumferential surface, and the first diamond composite sheets and the second diamond composite sheets are in contact with each other, the outer diameter of the first diamond composite sheet is larger than the gap between two adjacent second diamond composite sheets, the outer diameter of the second diamond composite sheet is larger than the gap between two adjacent first diamond composite sheets, and the number of the first diamond composite sheets and the second diamond composite sheets are unequal.

The diamond radial bearing according to the embodiment of the present invention has at least the following beneficial effects: the first diamond composite sheet and the second diamond composite sheet are respectively distributed along the circumferential direction on the outer circumferential surface of the inner ring of the bearing and the inner circumferential surface of the outer ring of the bearing, and the first diamond composite sheet and the second diamond composite sheet are distributed and extend out of the outer circumferential surface of the inner ring of the bearing and the inner circumferential surface of the outer ring of the bearing and fit each other. When the inner ring of the bearing rotates relative to the outer ring of the bearing, the first diamond composite sheet and the second diamond composite sheet rub against each other. Since the first diamond composite sheet and the second diamond composite sheet both have high wear resistance and impact resistance, the wear resistance and impact resistance of the bearing are improved. The outer diameter of the first diamond composite sheet is larger than the gap between two adjacent second diamond composite sheets, which can prevent the first diamond composite sheet from being stuck in the gap between two adjacent first diamond composite sheets. Similarly, the outer diameter of the second diamond composite sheet is larger than the gap between two adjacent first diamond composite sheets, which can prevent the second diamond composite sheet from being stuck in the gap between two adjacent first diamond composite sheets, thereby ensuring the normal operation of the bearing. In addition, the number of the first diamond composite sheets and the number of the second diamond composite sheets are not equal, which can prevent all the first diamond composite sheets or all the second diamond composite sheets from colliding at the same position at the same time, thereby effectively avoiding resonance and increasing the service life of the bearing.

According to some embodiments of the present invention, the number of the first diamond composite sheets is one less than the number of the second diamond composite sheets, which can make the structure of the bearing more compact and ensure that each first diamond composite sheet and each second diamond composite sheet has a support surface at any time when the bearing is working, and can also avoid all the first diamond composite sheets or all the second diamond composite sheets from colliding at the same position at the same time, avoid resonance, and improve the bearing life.

According to some embodiments of the present invention, the outer ring of the bearing is provided with a plurality of through holes along the radial direction for installing the second diamond composite sheet. Providing through holes on the outer ring of the bearing is conducive to installing the second diamond composite sheet on the outer ring of the bearing.

According to some embodiments of the present invention, a plug is installed at one end of the through hole close to the outer circumferential surface of the bearing outer ring. After the second diamond composite sheet is installed in the through hole, the plug is installed at one end of the through hole close to the outer circumferential surface of the bearing outer ring, which can increase the fixing strength of the second diamond composite sheet and improve the service life of the bearing.

According to some embodiments of the present invention, the outer circumferential surface of the bearing inner ring is radially provided with a plurality of blind holes for installing the first diamond composite sheet. Providing blind holes on the bearing inner ring facilitates installing the first diamond composite sheet on the bearing inner ring.

According to some embodiments of the present invention, the first diamond composite sheet and the second diamond composite sheet are both arranged in multiple rows along the axial direction. The first diamond composite sheet and the second diamond composite sheet are both arranged in multiple rows along the axial direction to meet the requirements of bearings with different wear resistance and impact resistance.

According to some embodiments of the present invention, two adjacent rows of the first diamond composite sheets are staggered, and two adjacent rows of the second diamond composite sheets are staggered. When the bearing is working, at each moment when the outer ring of the bearing rotates relative to the inner ring of the bearing, the total contact area of the first diamond composite sheet and the second diamond composite sheet rubbing against each other increases, which can improve the wear resistance of the bearing and increase the stability of the bearing when rotating.

The manufacturing process of the diamond radial bearing according to the second aspect of the present invention includes the following steps: providing a bearing inner ring and a bearing outer ring; machining a plurality of through holes in the radial direction on the bearing outer ring and the plurality of through holes are evenly distributed in the circumferential direction, welding one end of the second diamond composite sheet in the through hole, and making the other end of the second diamond composite sheet extend out of the inner circumferential surface of the bearing outer ring; machining a plurality of blind holes in the radial direction on the outer circumferential surface of the bearing inner ring and the plurality of blind holes are evenly distributed in the circumferential direction, machining a flux receiving groove on the bottom and inner circumferential surface of the blind hole, welding one end of the first diamond composite sheet in the blind hole, and making the other end of the first diamond composite sheet extend out of the outer circumferential surface of the bearing inner ring.

The manufacturing process of the diamond radial bearing according to the embodiment of the present invention has at least the following beneficial effects: the second diamond composite sheet is fixed in the through hole of the outer ring of the bearing by welding, and the operation is relatively convenient. In this process, a plurality of blind holes are processed radially on the outer circumferential surface of the inner ring of the bearing, and the plurality of blind holes are distributed circumferentially, and a flux receiving groove is processed at the bottom and inner circumferential surface of the blind hole, and the first diamond composite sheet is installed in the blind hole. During welding, the flux melts and flows into the flux receiving groove, which can improve the fixing strength of the first diamond composite sheet on the inner ring of the bearing. In the prior art, during welding, the flux overflows, and after the welding is completed, the flux cools and forms a bulge of a certain size at the welding point, and an additional process is required to remove the bulge. However, in this process, a flux receiving groove is processed at the bottom and inner circumferential surface of the blind hole, and the flux melts and flows into the flux receiving groove without overflowing, thereby reducing the process, facilitating the operation, and improving the quality and efficiency of welding.

According to some embodiments of the present invention, the following steps are also included: providing a plug and welding the plug to one end of the through hole near the outer circumferential surface of the bearing outer ring. After welding one end of the second diamond composite sheet in the through hole and making the other end of the second diamond composite sheet extend out of the inner circumferential surface of the bearing outer ring, installing the plug from the outer circumferential surface of the bearing outer ring into the through hole and welding the plug in the through hole can improve the fixing strength of the second diamond composite sheet on the bearing outer ring and improve the service life of the bearing.

According to some embodiments of the present invention, the first diamond composite sheet is fixed in the blind hole by brazing, which is convenient to operate and can also improve the quality and efficiency of welding.

Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a schematic structural diagram of a first embodiment of a diamond radial bearing according to an embodiment of the present invention;

FIG2 is a partial enlarged view of point A in FIG1;

FIG3 is a cross-sectional view of the diamond radial bearing shown in FIG1 ;

FIG4 is a partial enlarged view of point B in FIG3 ;

FIG5 is a schematic structural diagram of the inner ring of the bearing in the diamond radial bearing shown in FIG1 ;

FIG6 is a schematic structural diagram of the outer ring of the bearing in the diamond radial bearing shown in FIG1 ;

FIG7 is a schematic structural diagram of a second embodiment of a diamond radial bearing according to an embodiment of the present invention;

FIG. 8 is a cross-sectional view of the diamond radial bearing shown in FIG. 7 .

In the attached drawings: 100 is a bearing inner ring, 200 is a bearing outer ring, 300 is a plug, 110 is a first diamond composite sheet, 120 is a blind hole, 130 is a flux receiving groove, 210 is a second diamond composite sheet, and 220 is a through hole.

DETAILED DESCRIPTION

Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as excluding the number, and "above", "below", "within" etc. are understood as including the number.

The first implementation method:

Referring to FIGS. 1 to 6 , an embodiment of the present invention provides a diamond radial bearing, comprising a bearing inner ring 100 and a bearing outer ring 200 coaxially sleeved on the bearing inner ring 100. Referring to FIGS. 1 , 2 , 5 and 6 , a plurality of first diamond composite sheets 110 are circumferentially distributed on the outer circumferential surface of the bearing inner ring 100 and the first diamond composite sheets 110 extend out of the outer circumferential surface of the bearing inner ring 100. A plurality of second diamond composite sheets 210 are circumferentially distributed on the inner circumferential surface of the bearing outer ring 200 and the second diamond composite sheets 210 extend out of the inner circumferential surface of the bearing outer ring 200. When the bearing is working, the first diamond composite sheets 110 and the second diamond composite sheets 210 fit each other to ensure that the first diamond composite sheets 110 and the second diamond composite sheets 210 have supporting surfaces for mutual friction. Since both the first diamond composite sheets 110 and the second diamond composite sheets 210 have diamond layers, the wear resistance and impact resistance of the diamond layers are good, thereby improving the wear resistance and impact resistance of the bearing. Referring to FIG. 2 , when the bearing inner ring 100 rotates relative to the bearing outer ring 200, the gap between the friction surfaces of part of the first diamond composite sheet 110 and the second diamond composite sheet 210 is 0.1 mm to 0.2 mm, which not only ensures that the first diamond composite sheet 110 and the second diamond composite sheet 210 can rub against each other, but also enables a cooling water channel to be formed between the first diamond composite sheet 110 and the second diamond composite sheet 210. When the bearing works in the mud, the mud flows through the cooling water channel, which cools and lubricates the bearing. In this embodiment, the first diamond composite sheet 110 and the second diamond composite sheet 210 extend out of the outer circumferential surface of the bearing inner ring 100 and the inner circumferential surface of the bearing outer ring 200 by a height of 1.0 mm to 1.5 mm, respectively, and the gap between two adjacent first diamond composite sheets 110 is 1.0 mm to 3.0 mm, and the gap between two adjacent second diamond composite sheets 210 is 1.0 mm to 3.0 mm, so as to form a cooling water channel, which can also cool and lubricate the bearing when the bearing works in mud.

Referring to FIG. 1 , FIG. 5 and FIG. 6 , the outer diameter of the first diamond composite sheet 110 is larger than the gap between two adjacent second diamond composite sheets 210, which can prevent the first diamond composite sheet 110 from getting stuck in the gap between two adjacent first diamond composite sheets 110. Similarly, the outer diameter of the second diamond composite sheet 210 is larger than the gap between two adjacent first diamond composite sheets 110, which can prevent the second diamond composite sheet 210 from getting stuck in the gap between two adjacent first diamond composite sheets 110, thereby ensuring the normal operation of the bearing. In addition, the number of the first diamond composite sheets 110 and the second diamond composite sheets 210 is not equal, which can prevent all the first diamond composite sheets 110 or all the second diamond composite sheets 210 from colliding at the same position at the same time, thereby effectively avoiding resonance and improving the service life of the bearing. In this embodiment, the number of first diamond composite sheets 110 is one less than the number of second diamond composite sheets 210. Specifically, the number of first diamond composite sheets 110 is fifteen and the number of second diamond composite sheets 210 is sixteen. This can make the structure of the bearing more compact and ensure that the first diamond composite sheets 110 and the second diamond composite sheets 210 have mutually supporting friction surfaces during the movement of the bearing, and can also avoid all the first diamond composite sheets 110 or all the second diamond composite sheets 210 from colliding at the same position at the same time, thereby effectively avoiding resonance.

Referring to FIG. 3 and FIG. 4 , the outer ring 200 of the bearing is provided with a plurality of through holes 220 for installing the second diamond composite sheet 210 in the radial direction, which is conducive to installing the second diamond composite sheet 210 on the outer ring 200 of the bearing. A plug 300 is installed at one end of the through hole 220 close to the outer circumferential surface of the outer ring 200 of the bearing. After the second diamond composite sheet 210 is installed in the through hole 220, the plug 300 is installed at one end of the through hole 220 close to the outer circumferential surface of the outer ring 200 of the bearing, which can increase the fixing strength of the second diamond composite sheet 210 and improve the service life of the bearing. The outer circumferential surface of the inner ring 100 of the bearing is provided with a plurality of blind holes 120 for installing the first diamond composite sheet 110 in the radial direction. The blind holes 120 are provided on the inner ring 100 of the bearing, which is conducive to installing the first diamond composite sheet 110 on the inner ring 100 of the bearing.

The second implementation method:

Referring to FIG. 7 and FIG. 8 , the difference between this embodiment and the first embodiment is that the first diamond composite sheet 110 and the second diamond composite sheet 210 are both distributed in multiple rows along the axial direction, which can meet the requirements of bearings with different wear resistance and impact resistance. In some embodiments, two adjacent rows of first diamond composite sheets 110 are staggered, and two adjacent rows of second diamond composite sheets 210 are staggered. When the bearing is working, at every moment when the outer ring 200 of the bearing rotates relative to the inner ring 100 of the bearing, the total contact area of the first diamond composite sheet 110 and the second diamond composite sheet 210 rubbing against each other increases, which can not only improve the wear resistance of the bearing, but also increase the stability of the bearing when it rotates.

The present invention also provides a manufacturing process of a diamond radial bearing, comprising the following steps:

A. Providing a bearing inner ring 100 and a bearing outer ring 200;

B. A plurality of through holes 220 are processed radially on the bearing outer ring 200 and the plurality of through holes 220 are evenly distributed circumferentially, one end of the second diamond composite sheet 210 is welded in the through hole 220, and the other end of the second diamond composite sheet 210 is extended out of the inner circumferential surface of the bearing outer ring 200;

C. A plurality of blind holes 120 are radially processed on the outer circumferential surface of the bearing inner ring 100 and are evenly distributed in the circumferential direction. A flux receiving groove 130 is processed on the bottom and the inner circumferential surface of the blind hole 120. One end of the first diamond composite sheet 110 is welded in the blind hole 120, and the other end of the first diamond composite sheet 110 is extended out of the outer circumferential surface of the bearing inner ring 100.

In this embodiment, the second diamond composite sheet 210 is fixed in the through hole 220 of the bearing outer ring 200 by welding, which is convenient to operate. In this process, a plurality of blind holes 120 are radially processed on the outer circumferential surface of the bearing inner ring 100, and the plurality of blind holes 120 are distributed circumferentially, and flux receiving grooves 130 are processed at the bottom and inner circumferential surface of the blind holes 120. The first diamond composite sheet 110 is installed in the blind holes 120. During welding, the flux melts and flows into the flux receiving grooves 130, which can improve the fixing strength of the first diamond composite sheet 110 on the bearing inner ring 100. In the prior art, during welding, the flux overflows. After welding, the flux cools and forms a bulge of a certain size at the weld. An additional process is required to remove the bulge. However, in the present process, a flux receiving groove 130 is machined at the bottom and inner circumference of the blind hole 120. After the flux melts, it flows into the flux receiving groove 130 and does not overflow. This can reduce the number of processes, facilitate operation, and improve the quality and efficiency of welding.

The present invention also provides another manufacturing process of a diamond radial bearing, comprising the following steps:

A. Providing a bearing inner ring 100 and a bearing outer ring 200;

B. A plurality of through holes 220 are processed radially on the bearing outer ring 200 and the plurality of through holes 220 are evenly distributed circumferentially, one end of the second diamond composite sheet 210 is welded in the through hole 220, and the other end of the second diamond composite sheet 210 is extended out of the inner circumferential surface of the bearing outer ring 200;

C. Provide a plug 300 and weld the plug 300 to one end of the through hole 220 close to the outer circumferential surface of the bearing outer ring 200;

D. A plurality of blind holes 120 are radially processed on the outer circumferential surface of the bearing inner ring 100 and are evenly distributed in the circumferential direction. A flux receiving groove 130 is processed on the bottom and the inner circumferential surface of the blind hole 120. One end of the first diamond composite sheet 110 is welded in the blind hole 120, and the other end of the first diamond composite sheet 110 is extended out of the outer circumferential surface of the bearing inner ring 100.

In this embodiment, one end of the second diamond composite sheet 210 is welded in the through hole 220 by laser welding, and the other end of the second diamond composite sheet 210 is extended out of the inner circumference of the bearing outer ring 200, and then the plug 300 is placed into the through hole 220 from the outer circumference of the bearing outer ring 200, and the plug 300 is fixed in the through hole 220 by welding, thereby improving the fixing strength of the second diamond composite sheet 210. The first diamond composite sheet 110 is fixed in the blind hole 120 by brazing. Since the bottom and the inner circumference of the blind hole 120 are provided with a flux receiving groove 130, the flux flows into the flux receiving groove 130 after melting. On the one hand, the flux cools in the flux receiving groove 130, which can improve the fixing strength of the first diamond composite sheet 110. On the other hand, the flux will not overflow after melting, and will not form a bulge at the joint of the first diamond composite sheet 110 and the blind hole 120, which can reduce the processing steps and improve the quality and efficiency of welding. Of course, if necessary, the bearing can also be deburred and the roundness can be checked to further improve the quality of the bearing.

The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims (9)

1. A diamond radial bearing, characterized by comprising: A bearing inner ring (100), the outer circumferential surface of which is evenly distributed with a plurality of first diamond composite sheets (110) along the circumferential direction, the first diamond composite sheets (110) extending out of the outer circumferential surface, the outer circumferential surface of the bearing inner ring (100) is radially provided with a plurality of blind holes (120) for mounting the first diamond composite sheets (110), and the bottom and inner circumferential surface of the blind holes (120) are machined with flux receiving grooves (130); A bearing outer ring (200) has an inner circumferential surface on which a plurality of second diamond composite sheets (210) are evenly distributed in the circumferential direction, the second diamond composite sheets (210) extend out of the inner circumferential surface, the first diamond composite sheet (110) and the second diamond composite sheet (210) are in contact with each other, the outer diameter of the first diamond composite sheet (110) is greater than the gap between two adjacent second diamond composite sheets (210), the outer diameter of the second diamond composite sheet (210) is greater than the gap between two adjacent first diamond composite sheets (110), and the number of the first diamond composite sheets (110) and the number of the second diamond composite sheets (210) are unequal. 2. The diamond radial bearing according to claim 1, characterized in that the number of the first diamond composite sheets (110) is one less than the number of the second diamond composite sheets (210). 3. The diamond radial bearing according to claim 1 or 2, characterized in that the bearing outer ring (200) is provided with a plurality of through holes (220) along the radial direction for mounting the second diamond composite sheet (210). 4. The diamond radial bearing according to claim 3, characterized in that a plug (300) is installed at one end of the through hole (220) close to the outer circumferential surface of the bearing outer ring (200). 5. The diamond radial bearing according to claim 1 or 2, characterized in that the first diamond composite sheet (110) and the second diamond composite sheet (210) are both distributed in multiple rows along the axial direction. 6. The diamond radial bearing according to claim 5, characterized in that two adjacent rows of the first diamond composite sheets (110) are staggered with each other, and two adjacent rows of the second diamond composite sheets (210) are staggered with each other. 7. A manufacturing process of a diamond radial bearing, characterized in that it comprises the following steps: Providing a bearing inner ring (100) and a bearing outer ring (200); A plurality of through holes (220) are machined radially on the bearing outer ring (200), and the plurality of through holes (220) are evenly distributed circumferentially; one end of a second diamond composite sheet (210) is welded in the through hole (220), and the other end of the second diamond composite sheet (210) is extended out of the inner circumferential surface of the bearing outer ring (200); A plurality of blind holes (120) are machined radially on the outer circumferential surface of the bearing inner ring (100), and the plurality of blind holes (120) are evenly distributed in the circumferential direction; a flux receiving groove (130) is machined on the bottom and inner circumferential surface of the blind hole (120); one end of a first diamond composite sheet (110) is welded in the blind hole (120), and the other end of the first diamond composite sheet (110) is extended out of the outer circumferential surface of the bearing inner ring (100). 8. The manufacturing process of the diamond radial bearing according to claim 7, characterized in that it also includes the following steps: A plug (300) is provided, and the plug (300) is welded to one end of the outer circumferential surface of the through hole (220) close to the bearing outer ring (200). 9. The manufacturing process of the diamond radial bearing according to claim 7 or 8, characterized in that the first diamond composite sheet (110) is fixed in the blind hole (120) by brazing.