CN114087287B - Sliding bearing and static pushing type rotary guiding tool - Google Patents
Sliding bearing and static pushing type rotary guiding tool Download PDFInfo
- Publication number
- CN114087287B CN114087287B CN202010856386.1A CN202010856386A CN114087287B CN 114087287 B CN114087287 B CN 114087287B CN 202010856386 A CN202010856386 A CN 202010856386A CN 114087287 B CN114087287 B CN 114087287B
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- sliding bearing
- outer sleeve
- thrust
- spherical surface
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- 230000003068 static effect Effects 0.000 title claims abstract description 19
- 238000003780 insertion Methods 0.000 claims description 13
- 230000037431 insertion Effects 0.000 claims description 13
- 230000001154 acute effect Effects 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 238000005552 hardfacing Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000004519 grease Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
- F16C27/06—Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
- F16C27/063—Sliding contact bearings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
- F16C23/02—Sliding-contact bearings
- F16C23/04—Sliding-contact bearings self-adjusting
- F16C23/043—Sliding-contact bearings self-adjusting with spherical surfaces, e.g. spherical plain bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2352/00—Apparatus for drilling
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Support Of The Bearing (AREA)
Abstract
The invention provides a sliding bearing and a static pushing type rotary guiding tool, which comprises the following components: the bearing inner sleeve assembly comprises an inner support ring and a first thrust piece fixed on the outer side of the inner support ring; the bearing outer sleeve assembly comprises an outer supporting ring, a second thrust piece fixed on the outer side of the outer supporting ring, and an outer sleeve sleeved on the outer side of the outer supporting ring and movably connected with the outer supporting ring, wherein radial bearings are formed by sleeving the inner supporting ring and the outer supporting ring, the first thrust piece and the second thrust piece are axially arranged side by side to form thrust bearings, a first spherical surface in spherical pair contact with the outer wall of the outer sleeve is arranged on the second thrust piece, a second spherical surface in high pair contact with the inner wall of the outer sleeve is arranged on the outer wall of the outer supporting ring, and the spherical centers of the first spherical surface and the second spherical surface coincide on the central axes of the radial bearings and the thrust bearings. The sliding bearing of the invention can stably isolate the relative rotation between the rotary driving shaft and the non-rotary outer sleeve and has the capability of self-adaptively adjusting the bearing surface.
Description
Technical Field
The invention relates to the technical field of bearings, in particular to a sliding bearing and a static pushing type rotary guiding tool.
Background
The static push-against rotary steering tool includes a rotary drive shaft and a non-rotary housing. The rotary driving shaft is connected with the drill bit, the rotary driving shaft comprises an upper driving shaft and a lower driving shaft which are connected, the non-rotary outer sleeve penetrates through the upper driving shaft and is arranged between the upper driving shaft and the lower driving shaft, and the miniature hydraulic device on the non-rotary outer sleeve generates pushing force according to a certain control rule to push the supporting blocks on the non-rotary outer sleeve to prop against the well wall, so that guiding force is formed.
When the static pushing rotary guiding tool drills in a deflecting way, pushing force generated by the micro hydraulic device is transmitted to the rotary driving shaft through the slurry sliding bearing, the load born by the slurry sliding bearing is complex, and under the condition of high deflecting rate, the conventional slurry sliding bearing is easy to cause bearing blocking due to the fact that the conventional slurry sliding bearing cannot adapt to deformation of the non-rotary outer sleeve and the rotary driving shaft, so that the non-rotary outer sleeve and the rotary driving shaft synchronously rotate, and the instrument loses deflecting capability.
Disclosure of Invention
The invention aims to provide a sliding bearing and a static pushing type rotary guiding tool, which are used for solving the problem that the existing sliding bearing is easy to be blocked under the condition of high build slope so as to cause synchronous rotation of a non-rotary sleeve and a rotary driving shaft.
To achieve the above object, the present invention provides a sliding bearing comprising: the bearing inner sleeve assembly comprises an inner support ring and a first thrust piece fixed on the outer side of the inner support ring; the bearing outer sleeve assembly comprises an outer supporting ring, a second thrust piece fixed on the outer side of the outer supporting ring, and an outer sleeve sleeved on the outer side of the outer supporting ring and movably connected with the outer supporting ring, a radial bearing is sleeved outside the inner supporting ring and the outer supporting ring, the first thrust piece and the second thrust piece form a thrust bearing side by side along the axial direction, the central axis of the radial bearing is coincident with the central axis of the thrust bearing, a first spherical surface in spherical pair contact with the outer wall of the outer sleeve is arranged on the second thrust piece, a second spherical surface in high pair contact with the inner wall of the outer sleeve is arranged on the outer wall of the outer supporting ring, and the spherical center of the first spherical surface and the spherical center of the second spherical surface are coincident on the central axis of the radial bearing and the thrust bearing.
The sliding bearing as described above, wherein an angle between a line between any point on the contact surface of the first spherical surface and the outer sleeve and the center of the first spherical surface and the center axis of the thrust bearing is an acute angle.
The sliding bearing as described above, wherein the second spherical surface is in line contact with the inner wall surface of the outer sleeve, and an angle between a line between any point on a contact line between the second spherical surface and the outer sleeve and a center of the second spherical surface and a center axis of the radial bearing is 90 °.
The sliding bearing comprises the second thrust piece, wherein the second thrust piece comprises a connecting part connected with the outer supporting ring and an outer tilting part which is opposite to the outer supporting ring and tilted outwards, an annular space is formed between the outer tilting part and the outer side wall of the outer supporting ring, the first spherical surface is arranged on the inner side wall of the outer tilting part, one end, close to the second thrust piece, of the outer sleeve is an insertion end, the insertion end is inserted into the annular space, and the insertion end and the first spherical surface form spherical pair contact.
The sliding bearing as described above, wherein a plurality of support keys are fixed on the outer wall of the outer support ring, and the second spherical surface is disposed on the outer wall of each support key facing the outer sleeve.
The sliding bearing as described above, wherein the outer wall surface of the outer support ring is separated from the inner wall surface of the outer sleeve by an elastic rubber layer, and the outer support ring and the outer sleeve are movably connected by the elastic rubber layer.
The sliding bearing is characterized in that a first radial wear-resistant layer is arranged on the outer side wall of the inner support ring, a second radial wear-resistant layer is arranged on the inner side wall of the outer support ring, and a first axial wear-resistant layer and a second axial wear-resistant layer are respectively arranged on the end faces, facing each other, of the first thrust piece and the second thrust piece.
The sliding bearing as described above, wherein the first radial wear layer, the second radial wear layer, the first axial wear layer and the second axial wear layer are made by cemented carbide sintering, hard facing or using polycrystalline diamond compacts.
The sliding bearing is characterized in that the second thrust piece is provided with an oil filling hole, and the oil filling hole penetrates from the outer wall surface of the second thrust piece to the first spherical surface.
The invention also provides a static pushing type rotary guiding tool, which comprises a rotary driving shaft and a non-rotary outer sleeve, wherein the rotary driving shaft comprises an upper driving shaft and a lower driving shaft which are connected up and down, the non-rotary outer sleeve is sleeved outside the upper driving shaft and the lower driving shaft, an upper sliding bearing is arranged between the non-rotary outer sleeve and the upper driving shaft, and a lower sliding bearing is arranged between the non-rotary outer sleeve and the lower driving shaft; the upper sliding bearing and the lower sliding bearing are both the sliding bearings, the bearing inner sleeve assembly of the upper sliding bearing is fixedly connected with the upper driving shaft, the thrust bearing of the upper sliding bearing is positioned above the radial bearing of the upper sliding bearing, the outer sleeve of the upper sliding bearing is fixedly connected with the upper end of the non-rotating outer sleeve, the bearing inner sleeve assembly of the lower sliding bearing is fixedly connected with the lower driving shaft, the thrust bearing of the lower sliding bearing is positioned below the radial bearing of the lower sliding bearing, and the outer sleeve of the lower sliding bearing is fixedly connected with the lower end of the non-rotating outer sleeve.
The sliding bearing and the static pushing type rotary guiding tool have the characteristics and advantages that:
1. the sliding bearing is provided with the dynamic aligning mechanism, when the static pushing type rotary guiding tool is used for deflecting drilling, under the condition of high deflecting rate, the rotary driving shaft is bent and deformed, and due to the existence of the dynamic aligning mechanism, the radial bearing and the thrust bearing can be adaptively adjusted according to the deformation of the rotary driving shaft, namely, the radial bearing and the thrust bearing can rotate relative to the outer sleeve along with the rotary driving shaft around the spherical centers of the first spherical surface and the second spherical surface, so that the central axis of the radial bearing and the central axis of the thrust bearing always keep coincident with the central axis of the rotary driving shaft, and normal parallel contact is kept between the inner supporting ring and the outer supporting ring of the radial bearing and between the first thrust piece and the second thrust piece of the thrust bearing, and the blocking is prevented from occurring between the contact surfaces of the inner supporting ring and the outer supporting ring and between the contact surfaces of the first thrust piece and the second thrust piece, and the relative rotation between the rotary driving shaft and the non-rotary outer sleeve is stably isolated;
2. according to the invention, the elastic rubber layer is arranged between the outer support ring and the outer sleeve, so that a movable space is formed between the outer support ring and the outer sleeve, namely, the outer support ring and the outer sleeve are connected into an elastic body through the elastic rubber layer, and the outer support ring and the outer sleeve realize relative movement through extruding the elastic rubber layer, so that a movable space is provided for dynamic aligning; in addition, under high build rate conditions, the elastomeric rubber layer can also accommodate deformation of the non-rotating outer sleeve to avoid transmission of the deformation to the radial and thrust bearings.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a schematic view of a bearing inner sleeve assembly in a plain bearing of the present invention;
FIG. 2 is a schematic view of a bearing housing assembly in a plain bearing of the present invention;
fig. 3 is a schematic illustration of the sliding bearing of the static push-against rotary steerable tool of the present invention mated with a rotary drive shaft and a non-rotary outer sleeve.
Reference numerals for main elements:
1. a bearing inner sleeve assembly;
11. an inner support ring; 111. a first radial wear layer; 12. a first thrust member; 121. a first axial wear layer;
2. a bearing housing assembly;
21. an outer support ring; 211. a second spherical surface; 212. a second radial wear layer;
22. a second thrust member; 221. a first spherical surface; 222. a connection part; 223. an outer warping portion;
224. a second axial wear layer; 225. an oil filling hole;
23. a jacket; 231. an insertion end; 24. a support key; 25. an elastic rubber layer; 26. a seal ring;
10. a rotary drive shaft; 101. an upper drive shaft; 102. a lower drive shaft; 20. a non-rotating outer sleeve;
30. an upper sliding bearing; 40. a lower sliding bearing; 50. miniature hydraulic means and support blocks.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings. Wherein the use of the adjective or adverb modifiers "upper" and "lower," "top" and "bottom," "inner" and "outer" are merely for convenience of relative reference between groups of terms, and do not describe any particular directional limitation on the modified term. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; in addition, the spherical surface mentioned in the present invention is not limited to a complete spherical surface, but includes a part of a complete spherical surface.
Example 1
As shown in fig. 1 and 2, the present invention provides a sliding bearing for being disposed between two relatively rotating parts, such as a rotary drive shaft 10 and a non-rotary outer sleeve 20 of a static push-type rotary guide tool, the sliding bearing comprising a bearing inner sleeve assembly 1 and a bearing outer sleeve assembly 2, the bearing inner sleeve assembly 1 comprising an inner support ring 11 and a first thrust member 12 fixed on the outer side of the inner support ring 11, the bearing outer sleeve assembly 2 comprising an outer support ring 21, a second thrust member 22 fixed on the outer side of the outer support ring 21, and an outer sleeve 23 sleeved on the outer side of the outer support ring 21 and movably connected with the outer support ring 21, the inner support ring 11 and the outer support ring 21 being sleeved inside and outside to form a radial bearing for receiving radial load, the first thrust member 12 and the second thrust member 22 being formed side by side in axial direction for receiving axial load, the central axis of the radial bearing and the central axis of the thrust bearing being coincident, the second thrust member 22 being provided with a first spherical surface 221 forming spherical pair contact with the outer wall of the outer support ring 11, the outer support ring 21 being provided with a second spherical surface 221 forming a spherical pair contact with the outer wall of the outer support ring, and a second spherical pair being formed between the spherical pair 23 and the radial spherical pair and the spherical pair 23 being coincident with the second spherical pair 23 and the spherical pair being formed between the radial pair and the spherical pair 23 and the outer spherical pair being formed between the spherical pair and the spherical pair 23 and the spherical pair being coincident with the second spherical pair and the spherical pair of the spherical pair 23.
In use, the inner support ring 11 and the first thrust piece 12 of the bearing inner sleeve assembly 1 are fixedly connected with the rotary driving shaft 10 of the static pushing rotary guiding tool, the outer sleeve 23 of the bearing outer sleeve assembly 2 is fixedly connected with the non-rotary outer sleeve 20 of the static pushing rotary guiding tool, the radial bearing formed by the inner support ring 11 and the outer support ring 21 is used for bearing radial load between the rotary driving shaft 10 and the non-rotary outer sleeve 20, the thrust bearing formed by the first thrust piece 12 and the second thrust piece 22 is used for bearing axial load between the rotary driving shaft 10 and the non-rotary outer sleeve 20, the central axis of the radial bearing, the central axis of the thrust bearing and the central axis of the rotary driving shaft 10 are all coincident, when the static pushing rotary guiding tool is used for oblique drilling, the rotary driving shaft 10 is bent and deformed under the condition of high inclination, the radial bearing and the thrust bearing can be adaptively adjusted according to the deformation of the rotary driving shaft 10, that is, the radial bearing and the thrust bearing can rotate along with the rotary driving shaft 10 around the spherical centers of the first spherical surface 221 and the second spherical surface 211 relative to the outer sleeve 23, so that the central axis of the radial bearing and the central axis of the thrust bearing always keep coincident with the central axis of the rotary driving shaft 10, thereby keeping normal parallel contact between the inner supporting ring 11 and the outer supporting ring 21 of the radial bearing and between the first thrust piece 12 and the second thrust piece 22 of the thrust bearing, preventing the occurrence of seizing between the contact surfaces of the inner supporting ring 11 and the outer supporting ring 21 and between the contact surfaces of the first thrust piece 12 and the second thrust piece 22, and the sliding bearing of the present invention has the capability of adaptively adjusting the bearing surface, thereby stabilizing the isolation of relative rotation between the rotating drive shaft 10 and the non-rotating housing 20.
As shown in fig. 2, in an embodiment, an included angle α between a line between any point on the contact surface between the first spherical surface 221 and the outer sleeve 23 and the center of the first spherical surface 221 and the central axis of the thrust bearing is an acute angle, so that the spherical pair formed by the first spherical surface 221 and the outer sleeve 23 can realize axial alignment, and certainly can also realize radial alignment at the same time. Specifically, a third spherical surface that mates with the first spherical surface 221 is provided on the outer wall of the outer sleeve 23, and the center of the third spherical surface coincides with the center of the first spherical surface 221.
As shown in fig. 2, in an embodiment, the second spherical surface 211 is in line contact with the inner wall surface of the outer sleeve 23, the angle β between the line between any point on the contact line between the second spherical surface 211 and the outer sleeve 23 and the center axis of the second spherical surface 211 is 90 °, that is, the direction of the line between any point on the contact line between the second spherical surface 211 and the outer sleeve 23 and the center axis of the second spherical surface 211 is the radial direction of the radial bearing, so that the high pair formed by the second spherical surface 211 and the outer sleeve 23 can realize radial aligning.
As shown in fig. 2, in an embodiment, the second thrust member 22 includes a connection portion 222 connected to the outer support ring 21 and an outer tilted portion 223 tilted with respect to the outer support ring 21, an annular space is formed between the outer tilted portion 223 and an outer sidewall of the outer support ring 21, the first spherical surface 221 is disposed on an inner sidewall of the outer tilted portion 223, one end of the outer sleeve 23 adjacent to the second thrust member 22 is an insertion end 231, the insertion end 231 is inserted into the annular space, and the insertion end 231 and the first spherical surface 221 form a spherical pair contact.
Specifically, the connection portion 222 is of an annular structure, the connection portion 222 is sleeved on the outer side of the outer support ring 21, for example, the connection portion 222 is connected with the outer support ring 21 through threads, the outer warping portion 223 is of an annular structure, a cross section of an annular space between the outer warping portion 223 and an outer side wall of the outer support ring 21 is of a substantially triangular shape, an opening of the annular space faces the outer sleeve, an insertion end 231 of the outer sleeve 23 is of a substantially triangular shape, and the insertion end 231 of the outer sleeve 23 is inserted into the annular space through the opening of the annular space.
As shown in fig. 2, in an embodiment, a plurality of support keys 24 are fixed on the outer wall of the outer support ring 21 in an annular interval arrangement, and the second spherical surface 211 is provided on the outer wall of each support key 24 facing the outer jacket 23. For example, the number of the support keys 24 is three, and the three support keys 24 are arranged at equal intervals in a ring shape along the outer peripheral wall of the outer support ring 21.
Specifically, the supporting keys 24 are generally in a square structure, the outer wall surface of each supporting key 24 facing away from the outer supporting ring 21 is an arc-shaped curved surface, that is, the second spherical surface 211, and a plurality of key grooves are formed in the outer wall of the outer supporting ring 21, and the plurality of supporting keys 24 are respectively embedded into the plurality of key grooves and fixedly connected with the key grooves.
As shown in fig. 2, in an embodiment, the outer wall surface of the outer support ring 21 is separated from the inner wall surface of the outer sleeve 23 by an elastic rubber layer 25, and the outer support ring 21 and the outer sleeve 23 are movably connected by the elastic rubber layer 25, the elastic rubber layer 25 enables a movable space between the outer support ring 21 and the outer sleeve 23, that is, the outer support ring 21 and the outer sleeve 23 are connected into an elastic body by the elastic rubber layer 25, and the outer support ring 21 and the outer sleeve 23 realize relative movement by extruding the elastic rubber layer 25, so as to provide a movable space for dynamic centering; in addition, the elastomeric layer 25 is also capable of accommodating deformation of the non-rotating outer sleeve 20 under high build rate conditions so as not to transmit the deformation to the radial and thrust bearings.
During processing and manufacturing, an annular gap is left between the outer wall surface of the outer support ring 21 and the inner wall surface of the outer sleeve 23, elastic rubber is filled in the annular gap, and after the elastic rubber is vulcanized, an elastic rubber layer 25 which firmly adheres the outer support ring 21 and the outer sleeve 23 is obtained.
The elastic rubber layer 25 is annular, the elastic rubber layer 25 extends from the lower end of the outer sleeve 23 to the top of the insertion end 231 of the outer sleeve 23, and the supporting key 24 is embedded in the elastic rubber layer 25.
As shown in fig. 1 and 2, in an embodiment, the outer side wall of the inner support ring 11 is provided with a first radial wear layer 111, the inner side wall of the outer support ring 21 is provided with a second radial wear layer 212, the first radial wear layer 111 and the second radial wear layer 212 form wear surfaces of the radial bearing, the end surfaces of the first thrust piece 12 and the second thrust piece 22 facing each other are respectively provided with a first axial wear layer 121 and a second axial wear layer 224, and the first axial wear layer 121 and the second axial wear layer 224 form wear surfaces of the thrust bearing.
Further, the first radial wear layer 111, the second radial wear layer 212, the first axial wear layer 121, and the second axial wear layer 224 are made by cemented carbide sintering, hard facing, or with Polycrystalline Diamond Compacts (PDC).
As shown in fig. 2, in an embodiment, the second thrust piece 22 is provided with an oil injection hole 225, and the oil injection hole 225 penetrates from the outer wall surface of the second thrust piece 22 to the first spherical surface 221, so that grease or lubricating oil is injected into the spherical pair through the oil injection hole 225, and friction resistance when the second thrust piece 22 and the outer sleeve 23 relatively rotate is reduced.
Specifically, the oil hole 225 is disposed on the outer tilted portion 223 of the second thrust member 22, and a seal ring 26 is further disposed between the end of the outer tilted portion 223 and the outer jacket 23, so as to prevent grease or lubricant from leaking.
Example two
As shown in fig. 1, 2 and 3, the present invention further provides a static push-type rotary guiding tool, which includes a rotary driving shaft 10 and a non-rotary casing 20, wherein the rotary driving shaft 10 includes an upper driving shaft 101 and a lower driving shaft 102 which are connected up and down, the non-rotary casing 20 is sleeved outside the upper driving shaft 101 and the lower driving shaft 102, an upper sliding bearing 30 is provided between the non-rotary casing 20 and the upper driving shaft 101, and a lower sliding bearing 40 is provided between the non-rotary casing 20 and the lower driving shaft 102; the upper sliding bearing 30 and the lower sliding bearing 40 are both sliding bearings according to the first embodiment, the bearing inner sleeve assembly 1 of the upper sliding bearing 30 is fixedly connected with the upper driving shaft 101, the thrust bearing of the upper sliding bearing 30 is located above the radial bearing of the upper sliding bearing, the outer sleeve 23 of the upper sliding bearing 30 is fixedly connected with the upper end of the non-rotating outer sleeve 20, the bearing inner sleeve assembly 1 of the lower sliding bearing 40 is fixedly connected with the lower driving shaft 102, the thrust bearing of the lower sliding bearing 40 is located below the radial bearing of the lower sliding bearing, and the outer sleeve 23 of the lower sliding bearing 40 is fixedly connected with the lower end of the non-rotating outer sleeve 20.
When the static pushing type rotary guiding tool is used for deflecting drilling, under the condition of high deflection rate, the rotary driving shaft 10 is subjected to bending deformation, and due to the existence of the dynamic aligning mechanism, the radial bearing and the thrust bearing can be adaptively adjusted according to the deformation of the rotary driving shaft 10, namely, the radial bearing and the thrust bearing can rotate relative to the outer sleeve 23 along with the rotary driving shaft 10 around the spherical centers of the first spherical surface 221 and the second spherical surface 211, so that the central axis of the radial bearing and the central axis of the thrust bearing always keep coincident with the central axis of the rotary driving shaft 10, and normal parallel contact is kept between the inner supporting ring 11 and the outer supporting ring 21 of the radial bearing and between the first thrust piece 12 and the second thrust piece 22 of the thrust bearing, and the blocking is prevented from occurring between the contact surfaces of the inner supporting ring 11 and the outer supporting ring 21 and between the contact surfaces of the first thrust piece 12 and the second thrust piece 22, and the relative rotation between the rotary driving shaft 10 and the non-rotary outer sleeve 20 is stably isolated.
The invention makes the non-rotating jacket 20 suitable for the working condition with high slope by arranging the upper sliding bearing 30 and the lower sliding bearing 40, and the slope can reach 18 degrees/30 meters.
The fixing manner of the bearing inner sleeve assembly 1 of the upper sliding bearing 30 and the upper driving shaft 101 includes, but is not limited to, interference fit, spline connection or threaded connection, and the fixing manner of the bearing inner sleeve assembly 1 of the lower sliding bearing 40 and the lower driving shaft 102 includes, but is not limited to, interference fit, spline connection or threaded connection, and the fixing manner of the outer sleeve 23 of the upper sliding bearing 30 and the outer sleeve 23 of the lower sliding bearing 40 and the non-rotating outer sleeve 20 includes, but is not limited to, threaded connection.
Other structures of the static pushing type rotary guiding tool of the present invention, such as the micro hydraulic device and the supporting block 50 provided on the outer wall of the non-rotary casing 20, are all of the prior art, and are not described in detail.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention. It should be noted that, the components of the present invention are not limited to the above-mentioned overall application, and each technical feature described in the specification of the present invention may be selected to be used singly or in combination according to actual needs, so that other combinations and specific applications related to the present invention are naturally covered by the present invention.
Claims (10)
1. A sliding bearing, characterized in that the sliding bearing comprises:
the bearing inner sleeve assembly comprises an inner support ring and a first thrust piece fixed on the outer side of the inner support ring;
the bearing outer sleeve assembly comprises an outer supporting ring, a second thrust piece fixed on the outer side of the outer supporting ring, and an outer sleeve sleeved on the outer side of the outer supporting ring and movably connected with the outer supporting ring, a radial bearing is sleeved outside the inner supporting ring and the outer supporting ring, the first thrust piece and the second thrust piece form a thrust bearing side by side along the axial direction, the central axis of the radial bearing is coincident with the central axis of the thrust bearing, a first spherical surface in spherical pair contact with the outer wall of the outer sleeve is arranged on the second thrust piece, a second spherical surface in high pair contact with the inner wall of the outer sleeve is arranged on the outer wall of the outer supporting ring, and the spherical center of the first spherical surface and the spherical center of the second spherical surface are coincident on the central axis of the radial bearing and the thrust bearing.
2. The sliding bearing according to claim 1 wherein the angle between the line between any point on the contact surface of the first spherical surface and the outer sleeve and the center of the first spherical surface and the central axis of the thrust bearing is acute.
3. The sliding bearing according to claim 1, wherein the second spherical surface is in line contact with the inner wall surface of the outer sleeve, and an angle between a line between any point on a contact line of the second spherical surface and the outer sleeve and a center of the second spherical surface and a center axis of the radial bearing is 90 °.
4. The sliding bearing according to claim 1, wherein the second thrust member includes a connecting portion connected to the outer support ring and an outer tilted portion tilted outward with respect to the outer support ring, an annular space is formed between the outer tilted portion and an outer side wall of the outer support ring, the first spherical surface is provided on an inner side wall of the outer tilted portion, an end of the outer sleeve adjacent to the second thrust member is an insertion end, the insertion end is inserted into the annular space, and the insertion end and the first spherical surface form a spherical pair contact.
5. The sliding bearing according to claim 1, wherein a plurality of support keys are fixed on the outer wall of the outer support ring in annular interval arrangement, and the second spherical surface is arranged on the outer wall of each support key facing the outer sleeve.
6. The sliding bearing according to claim 1, wherein an outer wall surface of the outer support ring is separated from an inner wall surface of the outer sleeve by an elastic rubber layer, and the outer support ring and the outer sleeve are movably connected by the elastic rubber layer.
7. The sliding bearing according to claim 1 wherein a first radial wear layer is provided on the outer side wall of the inner support ring and a second radial wear layer is provided on the inner side wall of the outer support ring, the first and second thrust members being provided with a first axial wear layer and a second axial wear layer, respectively, on the end faces of the first and second thrust members facing each other.
8. The sliding bearing of claim 7 wherein the first radial wear layer, the second radial wear layer, the first axial wear layer, and the second axial wear layer are made from cemented carbide sintering, hardfacing, or from polycrystalline diamond compacts.
9. The sliding bearing according to claim 1, wherein the second thrust member is provided with an oil filler hole penetrating from an outer wall surface of the second thrust member to the first spherical surface.
10. The static pushing type rotary guiding tool is characterized by comprising a rotary driving shaft and a non-rotary outer sleeve, wherein the rotary driving shaft comprises an upper driving shaft and a lower driving shaft which are connected up and down, the non-rotary outer sleeve is sleeved outside the upper driving shaft and the lower driving shaft, an upper sliding bearing is arranged between the non-rotary outer sleeve and the upper driving shaft, and a lower sliding bearing is arranged between the non-rotary outer sleeve and the lower driving shaft;
the upper sliding bearing and the lower sliding bearing are the sliding bearings according to any one of claims 1 to 9, a bearing inner sleeve component of the upper sliding bearing is fixedly connected with the upper driving shaft, a thrust bearing of the upper sliding bearing is positioned above a radial bearing of the upper sliding bearing, an outer sleeve of the upper sliding bearing is fixedly connected with the upper end of the non-rotating outer sleeve, a bearing inner sleeve component of the lower sliding bearing is fixedly connected with the lower driving shaft, the thrust bearing of the lower sliding bearing is positioned below the radial bearing of the lower sliding bearing, and an outer sleeve of the lower sliding bearing is fixedly connected with the lower end of the non-rotating outer sleeve.
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| CN202010856386.1A CN114087287B (en) | 2020-08-24 | 2020-08-24 | Sliding bearing and static pushing type rotary guiding tool |
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| CN202010856386.1A CN114087287B (en) | 2020-08-24 | 2020-08-24 | Sliding bearing and static pushing type rotary guiding tool |
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| CN114087287A (en) | 2022-02-25 |
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