CN113027923A

CN113027923A - Biaxial action sliding bearing assembly and sliding bearing thereof

Info

Publication number: CN113027923A
Application number: CN202110473762.3A
Authority: CN
Inventors: 赵红梅
Original assignee: Beijing Chunlun Petroleum Technology Development Co ltd
Current assignee: Beijing Chunlun Petroleum Technology Development Co ltd
Priority date: 2021-04-29
Filing date: 2021-04-29
Publication date: 2021-06-25
Anticipated expiration: 2041-04-29

Abstract

The invention discloses a biaxial acting sliding bearing assembly and a sliding bearing thereof, wherein the sliding bearing comprises: rotor assembly, stator assembly, rotor assembly includes: a radial sliding bearing rotor and an axial thrust sliding bearing rotor; the radial sliding bearing rotor includes a radial rotor base body and a first radial sliding friction portion; the axial thrust sliding bearing rotor comprises an axial rotor base body and a first axial sliding friction part; the outer cylindrical surface of the radial sliding bearing rotor is provided with a multi-head spiral cooling groove; the stator assembly includes: the thrust adjusting device comprises a radial sliding bearing stator, an axial thrust sliding bearing stator, a thrust ring, a thrust adjusting ring, a bearing seat and a radial elastic sleeve; the radial sliding bearing stator comprises a radial stator base body and a second radial sliding friction part; the axial thrust sliding bearing stator comprises an axial stator base body and a second axial sliding friction part; the first and second radial sliding friction parts are made of hard alloy. The invention can prevent the friction part from cracking, thereby prolonging the service life of the sliding bearing.

Description

Biaxial action sliding bearing assembly and sliding bearing thereof

Technical Field

The invention relates to the technical field of metal processing and manufacturing of downhole tools for drilling, in particular to a sliding bearing assembly with biaxial action and a sliding bearing thereof.

Background

In the 90 s of the 20 th century, the rotary steerable drilling technology came out abroad, the traditional operation mode of the directional drilling technology on controlling the track of a well hole is changed, the rotary steerable drilling makes breakthrough progress in the aspects of operation efficiency and safety, and particularly, the rotary steerable drilling technology has remarkable advantages in the large-displacement directional drilling technology. A rotary steering drilling system prototype is developed in China and is popularized and tested in small batches, but the problems of short service life, low build rate and the like still exist.

The downhole tool of the rotary steering drilling system is divided into a steering short joint, an MWD module and a bidirectional communication and power module 3 large module. The guide short section is an underground decision and execution mechanism of the rotary guide drilling system for directional drilling under a rotating condition, and is used for transmitting the torque of the rotary table to the drill bit and controlling the magnitude and direction of lateral force of the drill bit for laterally cutting a stratum. The guide short section has a complex structure, complex working conditions and complex borne load, the performance and the service life of the guide short section directly determine the quality of the rotary guide drilling system, and the guide short section is the most core part of the rotary guide drilling system.

Specifically, the direction nipple joint mainly includes: the device comprises a rotary mandrel, a non-rotary outer barrel, a guide wing rib, a lower joint, an upper hard alloy bearing assembly, a non-contact transmission device, a guide control system, a hydraulic module, a lower hard alloy bearing assembly and the like. The upper and lower hard alloy bearing assemblies respectively comprise a hard alloy bearing rotor assembly and a hard alloy bearing stator assembly. The rotor assembly and the stator assembly can rotate relatively. During the use, upper and lower carbide bearing assembly combined action reduces terminal surface and inside and outside radial frictional force when rotatory dabber and the relative irrotational urceolus of lower clutch are rotatory, improves the abrasive resistance of direction nipple joint, makes rotatory dabber placed in the middle.

In order to carry the rock cuttings to the ground while breaking the rock, the modern rotary drilling mode generally adopts high solid content drilling fluid to circulate the rock cuttings to the ground; furthermore, the downhole formation temperature generally increases with increasing well depth in a gradient of 3 ℃/100m, i.e. 150 ℃ if drilled to a well depth of 5000m and 240 ℃ if drilled to a well depth of 8000 m. Because the rotary guide drilling system works under the conditions of high temperature in the well and high solid content drilling fluid cooling and lubricating, the existing radial-righting hard alloy sliding bearing is unreasonable in longitudinal/transverse cooling and lubricating groove design (patent ZL2020200588045.6), the gap between a radial stator (a static ring) and a radial rotor (a moving ring) is 0.1-0.5 mm, the gap between the outer diameter of a guide short section of the rotary guide drilling system and the inner wall of a shaft (an annular gap) is 10.0-50.0 mm, most of the drilling fluid (a cooling and lubricating medium) flows along an annular space with smaller resistance when the drilling fluid flows from the well bottom to the ground through an overflow surface of a bearing assembly, only a small amount of the cooling and lubricating medium can flow through the gap between the stator and the rotor, and the friction heat of a radial friction part and an axial friction part can not be taken away in time, so the hard alloy at the friction part is often cracked, the operational reliability and life of the rotary steerable drilling system is severely affected.

Therefore, there is a need for a new dual axial sliding bearing assembly with spiral grooves to better meet the requirements of high operational reliability and long service life of a rotary steerable drilling system.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a biaxial acting sliding bearing assembly and a sliding bearing thereof, which can prevent a friction part from cracking, thereby prolonging the service life of the sliding bearing and meeting the requirements of rotary steering drilling.

The above object of the present invention can be achieved by the following technical solutions:

a plain bearing comprising: a rotor assembly, a stator assembly,

the rotor assembly includes: a radial sliding bearing rotor and an axial thrust sliding bearing rotor; the radial sliding bearing rotor includes a radial rotor base body and a first radial sliding friction portion; the axial thrust sliding bearing rotor comprises an axial rotor base body and a first axial sliding friction part; the outer cylindrical surface of the radial sliding bearing rotor is provided with a multi-head spiral cooling groove extending towards the direction matched with the rotation direction of the drill bit;

the stator assembly includes: the thrust adjusting device comprises a radial sliding bearing stator, an axial thrust sliding bearing stator, a thrust ring, a thrust adjusting ring, a bearing seat and a radial elastic sleeve; the radial sliding bearing stator includes: a radial stator base and a second radial sliding friction portion; the axial thrust sliding bearing stator comprises an axial stator base body and a second axial sliding friction part;

the first radial sliding friction part and the second radial sliding friction part form a radial bearing sliding friction pair; the first radial sliding friction part and the second radial sliding friction part are both hard alloy friction parts.

A bi-axially acting plain bearing assembly comprising: an upper or lower slide bearing comprising the slide bearing described above.

In a preferred embodiment, the upper slide bearing includes an upper rotor assembly and an upper stator assembly, the lower slide bearing includes a lower stator assembly and a lower rotor assembly, the upper rotor assembly includes: an upper radial sliding bearing rotor and an upper axial thrust sliding bearing rotor; the upper radial sliding bearing rotor comprises an upper radial sliding bearing rotor base body and a first radial sliding friction part; the upper axial thrust sliding bearing rotor comprises an upper axial thrust sliding bearing rotor base body and a first axial sliding friction part;

a first multi-head spiral cooling groove is formed in the first outer cylindrical surface of the upper radial sliding bearing rotor, and a first seam-riding cylindrical pin groove is formed in the first inner cylindrical surface of the upper radial sliding bearing rotor;

the upper stator assembly includes: the upper radial sliding bearing stator, the upper axial thrust sliding bearing stator, the upper thrust adjusting ring, the upper bearing seat and the upper radial elastic sleeve are arranged on the upper radial sliding bearing stator; the upper radial sliding bearing stator comprises an upper radial sliding bearing stator base body and a second radial sliding friction part; the upper axial thrust sliding bearing stator comprises an upper axial thrust sliding bearing stator base body and a second axial sliding friction part; the first radial sliding friction part and the second radial sliding friction part form an upper radial bearing sliding friction pair, and the first axial sliding friction part and the second axial sliding friction part form an upper axial thrust bearing sliding friction pair; the first radial sliding friction part and the second radial sliding friction part are both hard alloy friction parts, and the first axial sliding friction part and the second axial sliding friction part are polycrystalline diamond friction parts or/and polycrystalline diamond and hard alloy composite friction parts;

a first multi-head spiral groove is formed in a first outer cylindrical surface of the upper radial sliding bearing stator, a first external thread is formed in a second outer cylindrical surface of the upper radial sliding bearing stator, or/and a third seam-following cylindrical pin groove is formed in a fourth outer cylindrical surface of the upper radial sliding bearing stator; or a third external thread is arranged on a third outer cylindrical surface of the upper radial sliding bearing stator; a first single-head spiral groove is formed in the first inner cylindrical surface of the upper bearing seat;

a fifth riding cylindrical pin groove is formed in the first inner cylindrical surface of the upper axial thrust sliding bearing stator, or a third internal thread is formed in the second inner cylindrical surface of the upper axial thrust sliding bearing stator, or an inner hexagonal cylindrical head screw hole is formed in the upper axial thrust sliding bearing stator base body;

a first inner cylindrical surface of the upper push ring is provided with a first internal thread; the upper push ring is provided with a first inner conical surface or a first inner spherical surface, or/and the first inner conical surface of the upper push ring is provided with a counter bore; the upper bearing seat is provided with a first outer conical surface or a first outer spherical surface;

the lower rotor assembly includes: a lower radial plain bearing rotor and a lower axial thrust plain bearing rotor; the lower radial sliding bearing rotor comprises a lower radial sliding bearing rotor base body and a third radial sliding friction part; the lower axial thrust sliding bearing rotor comprises a lower axial thrust sliding bearing rotor base body and a third axial sliding friction part;

a second multi-head spiral cooling groove is formed in the first outer cylindrical surface of the lower radial sliding bearing rotor; a second riding cylindrical pin groove is formed in the first inner cylindrical surface of the lower radial sliding bearing rotor;

the lower stator assembly includes: the lower radial sliding bearing stator, the lower axial thrust sliding bearing stator, the lower thrust ring, the lower thrust adjusting ring, the lower bearing seat and the lower radial elastic sleeve; the lower radial sliding bearing stator comprises a lower radial sliding bearing stator base body and a fourth radial sliding friction part; the lower axial thrust sliding bearing stator comprises a lower axial thrust sliding bearing stator base body and a fourth axial sliding friction part; the third radial sliding friction part and the fourth radial sliding friction part form a lower radial bearing sliding friction pair, and the third axial sliding friction part and the fourth axial sliding friction part form a lower axial thrust bearing sliding friction pair; the third radial sliding friction part and the fourth radial sliding friction part are both hard alloy friction parts, and the third axial sliding friction part and the fourth axial sliding friction part are polycrystalline diamond friction parts or/and polycrystalline diamond and hard alloy composite friction parts;

a first outer cylindrical surface of the lower radial sliding bearing stator is provided with a first multi-head spiral groove, a first outer thread is arranged on a first outer cylindrical surface of the lower radial sliding bearing stator, or/and a first outer cylindrical surface of the lower radial sliding bearing stator is provided with a first dowel pin groove; or a third outer cylindrical surface of the lower radial sliding bearing stator is provided with a fourth outer thread; a second single-head spiral groove is formed in the first inner cylindrical surface of the lower bearing seat;

a sixth seam-riding cylindrical pin groove is formed in the first inner cylindrical surface of the lower axial thrust sliding bearing stator, or a fourth internal thread is formed in the second inner cylindrical surface of the lower axial thrust sliding bearing stator, or a hexagon socket head screw hole is formed in the lower axial thrust sliding bearing stator base body;

a second internal thread is arranged on the first inner cylindrical surface of the lower thrust ring; the lower thrust ring is provided with a second inner conical surface or a second inner spherical surface, or/and the second inner conical surface of the lower thrust ring is provided with a counter bore; the lower bearing seat is provided with a second outer conical surface or a second outer spherical surface.

Advantageous effects

The sliding bearing provided by the present application is capable of forming a bi-axially acting sliding bearing assembly which, in a particular application, when the rotatory dabber of rotatory direction nipple joint does not rotate the urceolus clockwise relatively, be connected as whole with rotatory dabber and be connected as the first bull spiral cooling bath of dextrorotation on the first outer cylinder face of holistic upper radial slide bearing rotor with rotatory dabber and produce from bottom to top lifting force to the drilling fluid that has got into the cooling bath, the effect of production screw pump, more drilling fluids of circulating flow from bottom to top in the pit shaft annular space can receive the suction effect of the first bull spiral cooling bath of dextrorotation and get into the clearance between last rotor assembly and the last stator assembly, furthest takes away slide bearing friction heat circulation, the cooling lubrication friction is vice, prevent that the friction portion is chapped, thereby the life of extension slide bearing, satisfy the drilling demand of rotatory direction.

Drawings

The invention is further described with reference to the following figures and embodiments.

FIGS. 1 to 3 are schematic sectional views of a sliding bearing assembly with spiral grooves for biaxial action;

FIG. 4 is a schematic cross-sectional view of an upper rotor assembly and a lower rotor assembly;

FIG. 5 is a schematic cross-sectional view of a rotor with upper and lower radial sliding bearings;

FIG. 6 is a schematic cross-sectional view of a rotor base of an upper and lower radial sliding bearing;

FIG. 7 is a schematic cross-sectional view of an upper stator assembly and a lower stator assembly;

FIG. 8 is a schematic view of an upper stator assembly construction;

FIG. 9 is a schematic view of a lower stator assembly construction;

FIGS. 10 to 12 are schematic views of the structure of the stator base of an upper and a lower radial sliding bearing, respectively;

FIGS. 13 to 15 are schematic cross-sectional views of an upper thrust ring;

FIG. 16 is a schematic view of an upper thrust ring configuration;

FIGS. 17-19 are schematic cross-sectional views of a lower thrust collar;

FIG. 20 is a schematic view of a lower thrust collar construction;

FIG. 21 is a sectional view of an upper bearing seat;

FIG. 22 is a schematic view of an upper bearing housing;

FIG. 23 is a cross-sectional view of a lower bearing seat;

FIG. 24 is a schematic view of a lower bearing seat construction;

FIG. 25 is a sectional view of an upper bearing seat;

FIG. 26 is a cross-sectional view of a lower bearing seat;

FIG. 27 is a schematic cross-sectional view of an upper radially elastic sleeve;

FIG. 28 is a schematic view of a lower radially elastic sleeve configuration;

FIG. 29 is a schematic view of an upper axial thrust sliding bearing rotor construction;

FIG. 30 is a schematic cross-sectional view of an upper axial thrust sliding bearing rotor;

FIGS. 31 and 32 are schematic sectional views of an upper axial thrust sliding bearing rotor base;

FIG. 33 is a schematic view of an upper axial thrust sliding bearing stator construction;

FIG. 34 is a schematic cross-sectional view of an upper axial thrust sliding bearing stator;

FIG. 35 is a schematic cross-sectional view of an upper axial thrust sliding bearing stator base;

FIG. 36 is a schematic view of an upper axial thrust sliding bearing stator configuration;

FIG. 37 is a schematic cross-sectional view of an upper axial thrust sliding bearing stator base;

FIG. 38 is a schematic view of an upper axial thrust sliding bearing stator configuration;

FIG. 39 is a schematic cross-sectional view of an upper axial thrust sliding bearing stator base;

FIG. 40 is a schematic view of a lower axial thrust sliding bearing stator construction;

FIG. 41 is a cross-sectional view of a lower axial thrust sliding bearing stator;

FIG. 42 is a cross-sectional view of a lower axial thrust sliding bearing stator base;

FIG. 43 is a schematic view of a lower axial thrust sliding bearing stator construction;

FIG. 44 is a cross-sectional view of a lower axial thrust sliding bearing stator base;

FIG. 45 is a schematic view of a lower axial thrust sliding bearing stator construction;

FIG. 46 is a cross-sectional view of a lower axial thrust sliding bearing stator base;

FIG. 47 is a schematic view of a lower axial thrust sliding bearing rotor configuration;

FIG. 48 is a schematic cross-sectional view of a lower axial thrust sliding bearing rotor;

FIG. 49 is a cross-sectional view of a rotor base of a lower axial thrust sliding bearing;

FIG. 50 is a schematic cross-sectional view of a lower axial thrust sliding bearing rotor base;

fig. 51 is a schematic view of a friction portion of a polycrystalline diamond having a rounded-edge cylindrical sheet shape;

fig. 52 is a schematic view of a friction portion of a cylindrical piece of polycrystalline diamond with chamfered edges;

FIG. 53 is a schematic view of a composite friction portion of polycrystalline diamond and cemented carbide with rounded edges;

fig. 54 is a schematic structural view of a composite friction portion of edge-chamfered polycrystalline diamond and cemented carbide.

The reference numbers of the above figures:

1. an upper rotor assembly; 11. a socket head cap screw; 12. an O-shaped rubber sealing ring; 13. an upper radial plain bearing rotor; 131. an upper radial sliding bearing rotor base; 1311. a second outer cylindrical surface of the upper radial sliding bearing rotor; 1316. a first sewing cylindrical pin groove; 1317. a first inner cylindrical surface of the upper radial sliding bearing rotor; 1318. an upper radial plain bearing rotor first outer cylindrical surface; 1319. an upper radial sliding bearing rotor friction part mounting hole; 13111. a first multi-start helical cooling slot; 132. a first radial sliding friction portion; 14. an oil filling plug; 15. an upper axial thrust sliding bearing rotor; 151. an upper axial thrust sliding bearing rotor base body; 1511. a first inner cylindrical surface of the upper axial thrust sliding bearing rotor; 1512. an upper axial thrust sliding bearing rotor friction part mounting hole; 152. a first axial sliding friction portion; 16. an O-shaped rubber sealing ring;

2. an upper stator assembly; 20. an upper radial sliding bearing stator; 201. an upper radial sliding bearing stator base; 2010. an upper radial sliding bearing stator friction part mounting hole; 2011. a third cylindrical dowel groove; 2012. a first external thread; 2013. a first multi-start helical groove; 2015. a fourth outer cylindrical surface of the upper radial sliding bearing stator; 2016. a second outer cylindrical surface of the upper radial sliding bearing stator; 2017. an upper radial plain bearing stator first outer cylindrical surface; 2018. a third external thread; 2019. a third outer cylindrical surface of the upper radial sliding bearing stator; 202. a second radial sliding friction portion; 21. an upper axial thrust sliding bearing stator; 211. an upper axial thrust sliding bearing stator matrix; 2111. an upper axial thrust sliding bearing stator friction part mounting hole; 2113. a first inner cylindrical surface of the upper axial thrust sliding bearing stator; 2114. a fifth riding cylindrical pin groove; 2115. an upper axial thrust sliding bearing stator positioning keyway; 2116. a second inner cylindrical surface of the upper axial thrust sliding bearing stator; 2117. a third internal thread; 2118. an upper axial thrust sliding bearing stator inner hexagonal cylinder head screw hole; 2119. a first end surface of the upper axial thrust sliding bearing stator; 212. a second axial sliding friction part; 22. a cylindrical pin; 23. an upper thrust adjusting ring; 24. an upper thrust ring; 241. a first inner conical surface of the upper thrust ring; 243. a first internal thread; 244. a first inner cylindrical surface of the upper thrust ring; 245. a third positioning key groove of the upper thrust ring; 246. an upper thrust ring first inner spherical surface; 247. an upper thrust ring counter bore; 249. an upper thrust ring first end surface; 25. an O-shaped rubber sealing ring; 26. an upper bearing seat; 262. a first outer conical surface of the upper bearing seat; 265. a first single-ended helical groove; 266. an upper bearing seat external thread; 267. a first spherical outside surface of the upper bearing seat; 268. a first inner cylindrical surface of the upper bearing seat; 27. an O-shaped rubber sealing ring; 28. an upper radial elastic sleeve; 281. an axial through hole of the upper radial elastic sleeve; 282. a first single-start helical edge; 283. a first multi-start helical edge; 284. an upper radial elastic sleeve inner cylindrical surface; 285. an outer cylindrical surface of the upper radial elastic sleeve; 29. an upper positioning key; 210. a socket head cap screw;

3. an upper baffle ring;

4. a lower rotor assembly; 41. a socket head cap screw; 42. an O-shaped rubber sealing ring; 43. a lower radial plain bearing rotor; 431. a lower radial plain bearing rotor substrate; 4311. a lower radial plain bearing rotor second outer cylindrical surface; 4316. a second riding cylindrical pin groove; 4317. a lower radial plain bearing rotor first inner cylindrical surface; 4318. a lower radial plain bearing rotor first outer cylindrical surface; 4319. a lower radial sliding bearing rotor friction part mounting hole; 43111. a second multi-start helical cooling slot; 432. a third radial sliding friction portion; 44. an oil filling plug; 45. a lower axial thrust sliding bearing rotor; 451. a lower axial thrust sliding bearing rotor substrate; 4511. a first inner cylindrical surface of the lower axial thrust sliding bearing rotor; 4512. a lower axial thrust sliding bearing rotor friction part mounting hole; 452. a third axial sliding friction portion; 46. an O-shaped rubber sealing ring;

5. a lower stator assembly; 50. a lower radial plain bearing stator; 501. a lower radial plain bearing stator substrate; 5010. a lower radial sliding bearing stator friction part mounting hole; 5011. a fourth riding cylindrical pin groove; 5012. a second external thread; 5013. a second multi-start helical groove; 5015. a fourth outer cylindrical surface of the lower radial sliding bearing stator; 5016. a second outer cylindrical surface of the lower radial sliding bearing stator; 5017. a lower radial plain bearing stator first outer cylindrical surface; 5018. a fourth external thread; 5019. a third outer cylindrical surface of the lower radial sliding bearing stator; 502. a fourth radial sliding friction portion; 51. a lower axial thrust sliding bearing stator; 511. a lower axial thrust sliding bearing stator substrate; 5111. a lower axial thrust sliding bearing stator friction part mounting hole; 5113. a first inner cylindrical surface of the lower axial thrust sliding bearing stator; 5114. a sixth riding cylindrical pin groove; 5115. a lower axial thrust sliding bearing stator positioning keyway; 5116. a second inner cylindrical surface of the lower axial thrust sliding bearing stator; 5117. a fourth internal thread; 5118. a lower axial thrust sliding bearing stator inner hexagonal cylinder head screw hole; 5119. a lower axial thrust sliding bearing stator first end surface; 512. a fourth axial sliding friction portion; 52. a cylindrical pin; 53. a lower thrust adjusting ring; 54. a lower thrust ring; 541. a second inner conical surface of the lower thrust collar; 543. a second internal thread; 544. a lower thrust ring first inner cylindrical surface; 545. a third locating keyway of the lower thrust ring; 546. the lower thrust ring is a second inner spherical surface; 547. a lower thrust ring counterbore; 549. a lower thrust ring first end face; 56. a lower bearing seat; 562. a second outer conical surface of the lower bearing seat; 565. a second single-ended helical groove; 566. an external thread of the lower bearing seat; 567. a lower bearing seat second outer spherical surface; 568. a first inner cylindrical surface of the lower bearing seat; 58. a lower radial elastic sleeve; 581. the lower radial elastic sleeve is axially provided with a through hole; 582. a second single-ended helical edge; 583. a second multi-start helical edge; 584. a lower radial elastic sleeve inner cylindrical surface; 585. the outer cylindrical surface of the lower radial elastic sleeve; 59. a lower positioning key; 510. a socket head cap screw;

6. and a lower baffle ring.

r, radius of the fillet of the friction part; c. the friction part edge chamfer angle distance; alpha, the friction part edge chamfer angle.

Detailed Description

The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.

The present specification provides a sliding bearing which, when applied to a double-acting sliding bearing assembly, may comprise an upper sliding bearing and a lower sliding bearing, the upper sliding bearing or the lower sliding bearing comprising the sliding bearing described above. In the present specification, a description will be given of an example of a biaxial acting sliding bearing assembly to which the sliding bearing assembly is applied.

Referring to fig. 1 to 54, in accordance with an embodiment of the present invention, there is provided a sliding bearing assembly with a spiral groove for dual axial action, including: and an upper sliding bearing and a lower sliding bearing which are used in a matched mode. Wherein, last sliding bearing includes: the structure comprises an upper rotor assembly 1, an upper stator assembly 2 and an upper retaining ring 3; the lower slide bearing includes: a lower rotor assembly 4, a lower stator assembly 5 and a lower retaining ring 6.

The upper sliding bearing and the lower sliding bearing are mainly different in that the rotating directions of the connecting threads are opposite, and other structures can be mutually referred. In the present specification, the above slide bearing is mainly taken as an example for explanation. The upper sliding bearing can be referred to where the lower sliding bearing is the same in structure as the upper sliding bearing, and the description is omitted here.

In one embodiment, the upper rotor assembly 1 comprises: an upper radial slide bearing rotor 13 and an upper axial thrust slide bearing rotor 15. The upper radial sliding bearing rotor 13 includes an upper radial sliding bearing rotor base 131 and a first radial sliding friction portion 132. The upper axial thrust sliding bearing rotor 15 includes: an upper axial thrust sliding bearing rotor base 151 and a first axial sliding friction portion 152.

Referring to fig. 5 in combination, the upper radial plain bearing rotor first outer cylindrical surface 1318 is provided with a first multi-start helical cooling groove 13111. The direction of rotation or extension of the first multi-start helical cooling groove 13111 matches the direction of bit rotation. For example, in most cases, the direction of rotation of the first multi-start helical cooling groove 13111 is right-hand when the drill bit is rotated clockwise. In some special cases, if the drill bit is rotated counterclockwise, the rotation direction of the first multi-start helical cooling groove 13111 is left-handed.

Specifically, the starting position of the first multi-start spiral cooling groove 13111 is lower than the axially lowermost position of the first radial sliding friction portion 132, and the end position of the first multi-start spiral cooling groove 13111 is upper than the axially uppermost position of the first radial sliding friction portion 132, that is, the axial length of the first multi-start spiral cooling groove 13111 is slightly longer (5 to 10mm) than the axial length of the first outer cylindrical surface 1318 of the upper radial plain bearing rotor; the width of the first multi-start spiral cooling groove 13111 is generally set to 3-5 mm, and the depth of the first multi-start spiral cooling groove 13111 is generally set to 1-2 mm; the helix angle of the first multi-start helical cooling groove 13111 is generally set to 60-70 degrees, considering the axial length and diameter of the first outer cylindrical surface 1318 of the upper journal sliding bearing rotor and the specific number of the first multi-start helical cooling groove 13111, so as to meet the requirement that all the helical cooling grooves on the first outer cylindrical surface 1318 of the upper journal sliding bearing rotor do not overlap when projected to the same plane in the circumferential direction (i.e. it is always ensured that the second journal sliding friction part 202 of the upper journal sliding bearing stator does not fall into any helical cooling groove when the upper journal sliding bearing rotor 13 rotates). This ensures that both a sufficiently large number of first radial sliding friction sections 132 can be fitted to the first outer cylindrical surface 1318 of the upper radial plain bearing rotor and a sufficiently large flow area for the cooling medium (drilling fluid). When the rotary guide short section rotary mandrel rotates clockwise relative to the non-rotary outer cylinder, the right-handed first multi-head spiral cooling groove 13111 connected with the rotary mandrel into a whole on the first outer cylindrical surface of the upper radial sliding bearing rotor generates a lifting force from bottom to top to the drilling fluid entering the cooling groove, the effect of a screw pump is generated, more drilling fluid circularly flowing from bottom to top in the shaft annulus can enter the gap between the upper rotor assembly 1 and the upper stator assembly 2 under the suction effect of the right-handed first multi-head spiral cooling groove 13111, the friction heat of the sliding bearing is taken away to the maximum extent, the friction part is prevented from cracking, the service life of the sliding bearing is prolonged, and the rotary guide drilling requirement is met.

Referring also to FIG. 6, the upper radial plain bearing rotor first inner cylindrical surface 1317 is provided with a first slotted cylinder pin slot 1316.

The upper stator assembly 2 includes: an upper radial sliding bearing stator 20, an upper axial thrust sliding bearing stator 21, an upper thrust ring 24, an upper thrust adjusting ring 23, an upper bearing seat 26 and an upper radial elastic sleeve 28. The upper radial sliding bearing stator 20 includes an upper radial sliding bearing stator base 201 and a second radial sliding friction portion 202. The upper axial thrust sliding bearing stator 21 includes an upper axial thrust sliding bearing stator base 211 and a second axial sliding friction portion 212. The first radial sliding friction portion 132 and the second radial sliding friction portion 202 form an upper radial bearing sliding friction pair. The first axial sliding friction portion 152 and the second axial sliding friction portion 212 form an upper axial thrust bearing sliding friction pair. The first radial sliding friction portion 132 and the second radial sliding friction portion 202 are both cemented carbide friction portions. The first axial sliding friction portion 152 and the second axial sliding friction portion 212 are polycrystalline diamond friction portions or/and polycrystalline diamond and cemented carbide composite friction portions.

Referring to fig. 11, the upper journal bearing stator first outer cylindrical surface 2017 is provided with a first multi-start helical groove 2013. The first multi-start spiral groove 2013 is paired with the first multi-start spiral rib 283, and the first multi-start spiral rib 283 is embedded into the first multi-start spiral groove 2013, so that the upper radial sliding bearing stator 20 is connected with the upper radial elastic sleeve 28. Due to the thin wall of the upper journal bearing stator base 201, it is presently preferred to provide the first multi-start helical groove 2013 in the first outer cylindrical surface 2017 thereof.

The upper radial plain bearing stator second outer cylindrical surface 2016 is provided with first external threads 2012. The upper journal bearing stator third outer cylindrical surface 2019 is provided with a third external thread 2018. The fourth outer cylindrical surface 2015 of the upper radial sliding bearing stator is provided with a third dowel pin groove 2011. The upper bearing housing first inner cylindrical surface 268 is provided with a first single start helical groove 265.

A fifth riding cylindrical pin slot 2114 is formed in a first inner cylindrical surface 2113 of the upper axial thrust sliding bearing stator; or the second inner cylindrical surface 2116 of the upper axial thrust sliding bearing stator is provided with a third internal thread 2117, or/and the first end surface 2119 of the upper axial thrust sliding bearing stator is provided with a first positioning key slot 2115; or the upper axial thrust sliding bearing stator base body 211 is provided with an inner hexagonal socket head screw hole 2118.

Said upper thrust ring first inner cylindrical surface 244 is provided with a first internal thread 243; the upper thrust ring first end face 249 is provided with a third positioning key groove 245; the top thrust ring 24 is provided with a first inner conical surface 241 or a first inner spherical surface 246, and/or the top thrust ring first inner conical surface 241 is provided with a counterbore 247; the upper bearing seat 26 is provided with a first outer conical surface 262 or a first outer spherical surface 267; the upper radial elastic sleeve 28 is provided with an axial through hole 281, so that the upper radial elastic sleeve 28 can have a space to elastically deform when being subjected to an external force, thereby playing a role in shock absorption.

The lower rotor assembly 4 includes: a lower radial slide bearing rotor 43 and a lower axial thrust slide bearing rotor 45; the lower radial sliding bearing rotor 43 includes a lower radial sliding bearing rotor base 431 and a third radial sliding friction portion 432; lower axial thrust sliding bearing rotor 45 includes a lower axial thrust sliding bearing rotor base body 451 and a third axial sliding friction portion 452.

The lower radial plain bearing rotor first outer cylindrical surface 4318 is provided with a second multi-start spiral cooling groove 43111; the lower radial plain bearing rotor first inner cylindrical surface 4317 is provided with a second saddle-stitch cylindrical pin groove 4316.

The lower stator assembly 5 includes: a lower radial plain bearing stator 50, a lower axial thrust plain bearing stator 51, a lower thrust collar 54, a lower thrust adjustment collar 53, a lower bearing seat 56 and a lower radial elastic sleeve 58; the lower radial sliding bearing stator 50 includes a lower radial sliding bearing stator base 501 and a fourth radial sliding friction portion 502; the lower thrust sliding bearing stator 51 includes a lower thrust sliding bearing stator base 511 and a fourth axial sliding friction portion 512; the third radial sliding friction part 432 and the fourth radial sliding friction part 502 form a lower radial bearing sliding friction pair, and the third axial sliding friction part 452 and the fourth axial sliding friction part 512 form a lower axial thrust bearing sliding friction pair; the third radial sliding friction portion 432 and the fourth radial sliding friction portion 502 are both cemented carbide friction portions, and the third axial sliding friction portion 452 and the fourth axial sliding friction portion 512 are polycrystalline diamond friction portions or/and polycrystalline diamond and cemented carbide composite friction portions.

The lower radial plain bearing stator first outer cylindrical surface 5017 is provided with a second multi-start helical groove 5013, the lower radial plain bearing stator second outer cylindrical surface 5016 is provided with a second outer thread 5012, the lower radial plain bearing stator third outer cylindrical surface 5019 is provided with a fourth outer thread 5018, the lower radial plain bearing stator fourth outer cylindrical surface 5015 is provided with a fourth slotted cylindrical pin groove 5011; the lower housing first inner cylindrical surface 568 is provided with a second single start helical groove 565.

The first inner cylindrical surface 5113 of the lower axial thrust sliding bearing stator is provided with a sixth seam-riding cylindrical pin groove 5114; or the lower thrust sliding bearing stator second inner cylindrical surface 5116 is provided with a fourth internal thread 5117, or/and the lower thrust sliding bearing stator first end face 5119 is provided with a second positioning keyway 5115; or the lower axial thrust sliding bearing stator matrix 511 is provided with an inner hexagonal socket head screw hole 5118.

The first inner cylindrical surface 544 of the lower thrust collar is provided with a second internal thread 543; the lower thrust ring first end surface 549 is provided with a fourth positioning key groove 545; the lower thrust collar 54 is provided with a second inner conical surface 541 or a second inner spherical surface 546, and/or the second inner conical surface 541 of the lower thrust collar is provided with a counter bore 547; the lower bearing seat 56 is provided with a second outer conical surface 562 or a second outer spherical surface 567; the lower radial elastic sleeve 58 is provided with an axial through hole 581, so that the lower radial elastic sleeve 58 can be elastically deformed in space when being subjected to an external force, thereby playing a role in shock absorption.

In the embodiment of the application specification, two pairs of radial bearing sliding friction pairs and two pairs of axial bearing sliding friction pairs are arranged in one sliding bearing assembly at the same time, so that the inclination angle of the rotary guide short section rotary mandrel relative to the rotary guide short section non-rotating outer cylinder axis and the displacement of axial movement are limited, and the concentricity and the working stability of the rotary mandrel and the non-rotating outer cylinder are improved to a certain extent.

On the whole, the vice friction portion of going up radial bearing sliding friction and the vice friction portion of radial bearing sliding friction down are carbide friction portion among the sliding bearing assembly that this application provided, go up the vice friction portion of axial thrust bearing sliding friction and the vice friction portion of axial thrust bearing sliding friction down and be polycrystalline diamond friction portion or/and polycrystalline diamond and carbide composite friction portion. Because the first outer cylindrical surface 1318 of the upper radial sliding bearing rotor is provided with the right-handed first multi-head spiral cooling groove 13111, the first outer cylindrical surface 4318 of the lower radial sliding bearing rotor is provided with the right-handed second multi-head spiral cooling groove 43111, when the rotary guide short-section rotary mandrel rotates clockwise relative to the non-rotating outer cylinder, the right-handed second multi-head spiral cooling groove 43111 on the first outer cylindrical surface 4318 of the lower radial sliding bearing rotor integrally connected with the rotary mandrel and the right-handed first multi-head spiral cooling groove 13111 on the first outer cylindrical surface 1318 of the upper radial sliding bearing rotor integrally connected with the rotary mandrel generate the lifting force from bottom to top on the drilling fluid which enters the cooling grooves, so as to generate the effect of a screw pump, more drilling fluid in the well shaft annulus can enter between the lower rotor assembly 5 and the lower stator assembly 4 under the suction force of the right-handed first multi-head spiral cooling groove 13111 and the right-handed second multi-, Go up the clearance between rotor assembly 1 and the last stator assembly 2, in time the cooling lubrication friction portion prevents that friction portion is chapped to the life of extension rotary steering drilling system satisfies rotary steering drilling system's comprehensive user demand.

In the present embodiment, different embodiments are developed and described in detail mainly according to the specific composition, structure, and the like of the upper stator assembly 2 and the lower stator assembly 5.

Referring to fig. 1, 4, 5, 6, 7, 8, 9, 10, 13, 17, 21, 22, 23, 24, 27, 28, 29, 30, 31, 33, 34, 35, 40, 41, 42, 47, 48, 49, 52, a first embodiment provides a dual axial acting spiral groove sliding bearing assembly comprising an upper rotor assembly 1, an upper stator assembly 2, an upper range ring 3, a lower rotor assembly 4, a lower stator assembly 5 and a lower range ring 6.

The upper rotor assembly 1 comprises an inner hexagonal socket head cap screw 11, an O-shaped rubber sealing ring 12, an upper radial sliding bearing rotor 13, an oil filling plug 14, an upper axial thrust sliding bearing rotor 15 and an O-shaped rubber sealing ring 16; the upper radial sliding bearing rotor 13 includes an upper radial sliding bearing rotor base 131 and a first radial sliding friction portion 132; the upper axial thrust sliding bearing rotor 15 includes an upper axial thrust sliding bearing rotor base 151 and a first axial sliding friction portion 152.

The upper radial plain bearing rotor first outer cylindrical surface 1318 is provided with a first multi-start helical cooling groove 13111 and the upper radial plain bearing rotor first inner cylindrical surface 1317 is provided with a first saddle-stitch cylindrical pin groove 1316.

The upper stator assembly 2 includes, but is not limited to, an upper radial sliding bearing stator 20, an upper axial thrust sliding bearing stator 21, an upper thrust ring 24, an upper thrust adjusting ring 23, an upper bearing seat 26 and an upper radial elastic sleeve 28; the upper radial sliding bearing stator 20 includes an upper radial sliding bearing stator base 201 and a second radial sliding friction portion 202; the upper axial thrust sliding bearing stator 21 includes an upper axial thrust sliding bearing stator base 211 and a second axial sliding friction portion 212; the first radial sliding friction portion 132 and the second radial sliding friction portion 202 form an upper radial bearing sliding friction pair, and the first axial sliding friction portion 152 and the second axial sliding friction portion 212 form an upper axial thrust bearing sliding friction pair; the first radial sliding friction portion 132 and the second radial sliding friction portion 202 are both cemented carbide friction portions, and the first axial sliding friction portion 152 and the second axial sliding friction portion 212 are polycrystalline diamond friction portions.

The first outer cylindrical surface 2017 of the upper radial sliding bearing stator is provided with a first multi-head spiral groove 2013, the second outer cylindrical surface 2016 of the upper radial sliding bearing stator is provided with a first external thread 2012, and the fourth outer cylindrical surface 2015 of the upper radial sliding bearing stator is provided with a third stitching cylindrical pin groove 2011; the upper bearing housing first inner cylindrical surface 268 is provided with a first single start helical groove 265.

The first inner cylindrical surface 2113 of the upper axial thrust sliding bearing stator is provided with a fifth straddle cylindrical pin slot 2114.

Said top thrust ring first inner cylindrical surface 244 is provided with a first internal thread 243, said top thrust ring 24 is provided with a first inner conical surface 241; the upper bearing seat 26 is provided with a first external conical surface 262; the upper radial elastic sleeve 28 is provided with an axial through hole 281.

The lower rotor assembly 4 comprises an inner hexagonal socket head screw 41, an O-shaped rubber sealing ring 42, a lower radial sliding bearing rotor 43, an oil filling plug 44, a lower axial thrust sliding bearing rotor 45 and an O-shaped rubber sealing ring 46; the lower radial sliding bearing rotor 43 includes a lower radial sliding bearing rotor base 431 and a third radial sliding friction portion 432; lower axial thrust sliding bearing rotor 45 includes a lower axial thrust sliding bearing rotor base body 451 and a third axial sliding friction portion 452.

The lower stator assembly 5 includes: a lower radial plain bearing stator 50, a lower axial thrust plain bearing stator 51, a lower thrust collar 54, a lower thrust adjustment collar 53, a lower bearing seat 56 and a lower radial elastic sleeve 58; the lower radial sliding bearing stator 50 includes a lower radial sliding bearing stator base 501 and a fourth radial sliding friction portion 502; the lower thrust sliding bearing stator 51 includes a lower thrust sliding bearing stator base 511 and a fourth axial sliding friction portion 512; the third radial sliding friction part 432 and the fourth radial sliding friction part 502 form a lower radial bearing sliding friction pair, and the third axial sliding friction part 452 and the fourth axial sliding friction part 512 form a lower axial thrust bearing sliding friction pair; the third radial sliding friction portion 432 and the fourth radial sliding friction portion 502 are both cemented carbide friction portions, and the third axial sliding friction portion 452 and the fourth axial sliding friction portion 512 are polycrystalline diamond friction portions.

The lower radial plain bearing stator first outer cylindrical surface 5017 is provided with a second multi-start helical groove 5013, the lower radial plain bearing stator second outer cylindrical surface 5016 is provided with a second outer thread 5012, and the lower radial plain bearing stator fourth outer cylindrical surface 5015 is provided with a fourth dowel pin groove 5011; the lower housing first inner cylindrical surface 568 is provided with a second single start helical groove 565.

The lower axial thrust sliding bearing stator first inner cylindrical surface 5113 is provided with a sixth u-shaped dowel groove 5114.

The lower thrust collar first inner cylindrical surface 544 is provided with a second internal thread 543, and the lower thrust collar 54 is provided with a second inner conical surface 541; the lower bearing seat 56 is provided with a second outer conical surface 562; the lower radial elastic sleeve 58 is provided with an axial through hole 581.

The upper radial sliding bearing rotor 13 and the upper axial thrust sliding bearing rotor 15 in the upper rotor assembly 1 are connected together through an inner hexagonal socket head cap screw 11, and meanwhile, a second outer cylindrical surface 1311 of the upper radial sliding bearing rotor is in interference fit with a first inner cylindrical surface 1511 of the upper axial thrust sliding bearing rotor; the lower radial sliding bearing rotor 43 and the lower axial thrust sliding bearing rotor 45 in the lower rotor assembly 4 are connected together through an inner hexagonal socket head cap screw 41, and meanwhile, a second outer cylindrical surface 4311 of the lower radial sliding bearing rotor and a first inner cylindrical surface 4511 of the lower axial thrust sliding bearing rotor are in interference fit.

The upper stator assembly 2 further comprises an upper cylindrical pin 22, and the lower stator assembly further comprises a lower cylindrical pin 52; the fourth outer cylindrical surface 2015 of the upper radial sliding bearing stator and the first inner cylindrical surface 2113 of the upper axial thrust sliding bearing stator are connected together through the upper cylindrical pin 22, and meanwhile, the fourth outer cylindrical surface 2015 of the upper radial sliding bearing stator and the first inner cylindrical surface 2113 of the upper axial thrust sliding bearing stator are in interference fit; the first external thread 2012 of the second external cylindrical surface of the upper radial sliding bearing stator is connected with the first internal thread 243 of the first internal cylindrical surface of the upper thrust ring; the upper radial sliding bearing stator 20 and the upper bearing seat 26 are connected together through the upper radial elastic sleeve 28; the fourth outer cylindrical surface 5015 of the lower radial sliding bearing stator is connected with the first inner cylindrical surface 5113 of the lower axial thrust sliding bearing stator through the lower cylindrical pin 52, and the fourth outer cylindrical surface 5015 of the lower radial sliding bearing stator is connected with the first inner cylindrical surface 5113 of the lower axial thrust sliding bearing stator through the lower cylindrical pin 52 in an interference fit; the second external thread 5012 of the second external cylindrical surface of the lower radial sliding bearing stator is connected with the second internal thread 543 of the first internal cylindrical surface of the lower thrust collar; the lower radial sliding bearing stator 50 and the lower bearing seat 56 are connected together by the lower radial elastic sleeve 58.

The first internal thread 243 and the first external thread 2012 are right-hand threads; the second internal threads 543 and the second external threads 5012 are both left-hand threads.

The upper radial elastic sleeve 28 is provided with 3 through holes 281 along the axial direction, and the lower radial elastic sleeve 58 is provided with 3 through holes 581 along the axial direction; the upper radial elastic sleeve 28 and the lower radial elastic sleeve 58 are made of fluororubber and have a shore (shore) hardness of 75; a first multi-head spiral rib 283 is arranged on the inner cylindrical surface 284 of the upper radial elastic sleeve, and a second multi-head spiral rib 583 is arranged on the inner cylindrical surface 584 of the lower radial elastic sleeve; the upper radial elastomeric sleeve outer cylindrical surface 285 is provided with a first single start helix edge 282 and the lower radial elastomeric sleeve outer cylindrical surface 585 is provided with a second single start helix edge 582.

The number of the first multi-start spiral groove 2013 and the number of the first multi-start spiral edge 283 are both 4, the lead is 1000mm, the rotation direction is right rotation, and the first multi-start spiral groove 2013 is matched with the first multi-start spiral edge 283; the number of the heads of the second multi-head spiral groove 5013 and the number of the heads of the second multi-head spiral rib 583 are both 4, the lead is 1000mm, the rotation direction is right rotation, and the second multi-head spiral groove 5013 is matched with the second multi-head spiral rib 583; the number of turns of the first single-ended helical groove 265 and the number of turns of the first single-ended helical ridge 282 are both 2 turns, the thread pitches are both 30mm, the rotation directions are both right-handed, and the first single-ended helical groove 265 is paired with the first single-ended helical ridge 282; the number of turns of the second single-end spiral groove 565 and the number of turns of the second single-end spiral rib 582 are 2 turns, the thread pitch is 30mm, the direction of rotation is right-handed rotation, and the second single-end spiral groove 565 is paired with the second single-end spiral rib 582.

The upper bearing seat external thread 266 is a right-hand thread; the lower bearing housing external threads 566 are left-hand threads.

The upper thrust ring first inner conical surface 241 is in contact with the upper bearing seat first outer conical surface 262; the lower thrust ring second inner conical surface 541 is in contact with the lower bearing seat second outer conical surface 562.

The polycrystalline diamond friction part is a cylindrical and sheet-shaped polycrystalline diamond friction part with chamfered edges.

The side chamfer size of the side chamfer cylindrical sheet-shaped polycrystalline diamond friction part is as follows: the distance c is 0.5mm and the angle α is 45 °.

Between the first radial sliding friction portion 132 and the upper radial plain bearing rotor friction portion mounting hole 1319, between the second radial sliding friction portion 202 and the upper radial plain bearing stator friction portion mounting hole 2010, between the third radial sliding friction portion 432 and the lower radial plain bearing rotor friction portion mounting hole 4319, between the fourth radial sliding friction portion 502 and the lower radial plain bearing stator friction portion mounting hole 5010; the first axial sliding friction portion 152 and the upper axial sliding bearing rotor friction portion mounting hole 1512, the second axial sliding friction portion 212 and the upper axial sliding bearing stator friction portion mounting hole 2111, the third axial sliding friction portion 452 and the lower axial sliding bearing rotor friction portion mounting hole 4512, and the fourth axial sliding friction portion 512 and the lower axial sliding bearing stator friction portion mounting hole 5111 are brazed together by a pressureless dip sintering brazing method using a solder and a flux.

The number of the first stitching cylindrical pin groove 1316, the second stitching cylindrical pin groove 4316, the third stitching cylindrical pin groove 2011, the fourth stitching cylindrical pin groove 5011, the fifth stitching cylindrical pin groove 2114 and the sixth stitching cylindrical pin groove 5114 is respectively 3; the polycrystalline diamond rubbing portion has a resistance of less than 110 ohms.

The number of the first multi-head spiral cooling groove 13111 is 8, the lead is 1000mm, and the rotation direction is right; the number of the heads of the second multi-head spiral cooling groove 43111 is 8, the lead is 1000mm, and the rotation direction is right.

Referring to fig. 2, 4, 5, 6, 7, 8, 9, 11, 15, 16, 19, 20, 25, 26, 27, 28, 29, 32, 33, 36, 37, 40, 43, 44, 47, 50 and 54, in the second embodiment, there is provided a dual axial acting spiral grooved sliding bearing assembly comprising an upper rotor assembly 1, an upper stator assembly 2, an upper range ring 3, a lower rotor assembly 4, a lower stator assembly 5 and a lower range ring 6.

The upper stator assembly 2 includes, but is not limited to, an upper radial sliding bearing stator 20, an upper axial thrust sliding bearing stator 21, an upper thrust ring 24, an upper thrust adjusting ring 23, an upper bearing seat 26 and an upper radial elastic sleeve 28; the upper radial sliding bearing stator 20 includes an upper radial sliding bearing stator base 201 and a second radial sliding friction portion 202; the upper axial thrust sliding bearing stator 21 includes an upper axial thrust sliding bearing stator base 211 and a second axial sliding friction portion 212; the first radial sliding friction portion 132 and the second radial sliding friction portion 202 form an upper radial bearing sliding friction pair, and the first axial sliding friction portion 152 and the second axial sliding friction portion 212 form an upper axial thrust bearing sliding friction pair; the first radial sliding friction portion 132 and the second radial sliding friction portion 202 are both cemented carbide friction portions, and the first axial sliding friction portion 152 and the second axial sliding friction portion 212 are polycrystalline diamond and cemented carbide composite friction portions.

The first outer cylindrical surface 2017 of the upper radial sliding bearing stator is provided with a first multi-head spiral groove 2013, and the third outer cylindrical surface 2019 of the upper radial sliding bearing stator is provided with a third external thread 2018; the upper bearing housing first inner cylindrical surface 268 is provided with a first single start helical groove 265.

The second inner cylindrical surface 2116 of the upper axial thrust sliding bearing stator is provided with a third internal thread 2117, and the first end surface 2119 of the upper axial thrust sliding bearing stator is provided with a first positioning key slot 2115.

The top thrust ring first end surface 249 is provided with a third positioning keyway 245, and the top thrust ring 24 is provided with a first inner spherical surface 246; said upper bearing housing 26 is provided with a first spherical outer surface 267; the upper radial elastic sleeve 28 is provided with an axial through hole 281.

The lower stator assembly 5 includes, but is not limited to, a lower radial plain bearing stator 50, a lower axial thrust plain bearing stator 51, a lower thrust ring 54, a lower thrust adjustment ring 53, a lower bearing seat 56, and a lower radial elastic sleeve 58; the lower radial sliding bearing stator 50 includes a lower radial sliding bearing stator base 501 and a fourth radial sliding friction portion 502; the lower thrust sliding bearing stator 51 includes a lower thrust sliding bearing stator base 511 and a fourth axial sliding friction portion 512; the third radial sliding friction part 432 and the fourth radial sliding friction part 502 form a lower radial bearing sliding friction pair, and the third axial sliding friction part 452 and the fourth axial sliding friction part 512 form a lower axial thrust bearing sliding friction pair; the third radial sliding friction portion 432 and the fourth radial sliding friction portion 502 are both cemented carbide friction portions, and the third axial sliding friction portion 452 and the fourth axial sliding friction portion 512 are polycrystalline diamond and cemented carbide composite friction portions.

The lower radial plain bearing stator first outer cylindrical surface 5017 is provided with a second multi-start helical groove 5013, and the lower radial plain bearing stator third outer cylindrical surface 5019 is provided with a fourth outer thread 5018; the lower housing first inner cylindrical surface 568 is provided with a second single start helical groove 565.

The lower thrust sliding bearing stator second inner cylindrical surface 5116 is provided with a fourth internal thread 5117, and the lower thrust sliding bearing stator first end surface 5119 is provided with a second positioning key groove 5115.

The lower thrust ring first end surface 549 is provided with a fourth locating keyway 545, and the lower thrust ring 54 is provided with a second inner spherical surface 546; the lower bearing seat 56 is provided with a second outer spherical surface 567; the lower radial elastic sleeve 58 is provided with an axial through hole 581.

The upper stator assembly 2 further comprises an upper positioning key 29, and the lower stator assembly 5 further comprises a lower positioning key 59; the third outer thread 2018 of the third outer cylindrical surface of the upper radial sliding bearing stator is connected with the third inner thread 2117 of the second inner cylindrical surface of the upper axial thrust sliding bearing stator, and the upper axial thrust sliding bearing stator 21 and the upper thrust ring 24 are positioned through the upper positioning key 29; the upper radial sliding bearing stator 20 and the upper bearing seat 26 are connected together through the upper radial elastic sleeve 28; the lower radial sliding bearing stator third outer cylindrical surface fourth outer thread 5018 and the lower axial thrust sliding bearing stator second inner cylindrical surface fourth inner thread 5117 are connected together, and the lower axial thrust sliding bearing stator 51 and the lower thrust ring 54 are positioned by the lower positioning key 59; the lower radial sliding bearing stator 50 and the lower bearing seat 56 are connected together by the lower radial elastic sleeve 58.

The third internal threads 2117 and the third external threads 2018 are right-hand threads; the fourth internal thread 5117 and the fourth external thread 5018 are both left-hand threads.

The number of the first multi-start spiral groove 2013 and the number of the first multi-start spiral edge 283 are both 5, the lead is 1000mm, the rotation direction is right rotation, and the first multi-start spiral groove 2013 is matched with the first multi-start spiral edge 283; the number of the heads of the second multi-start spiral groove 5013 and the number of the heads of the second multi-start spiral ribs 583 are both 5, the lead is 1000mm, the rotation direction is right rotation, and the second multi-start spiral groove 5013 is matched with the second multi-start spiral ribs 583; the number of turns of the first single-ended helical groove 265 and the number of turns of the first single-ended helical ridge 282 are both 2 turns, the thread pitches are both 30mm, the rotation directions are both right-handed, and the first single-ended helical groove 265 is paired with the first single-ended helical ridge 282; the number of turns of the second single-end spiral groove 565 and the number of turns of the second single-end spiral rib 582 are 2 turns, the thread pitch is 30mm, the direction of rotation is right-handed rotation, and the second single-end spiral groove 565 is paired with the second single-end spiral rib 582.

Said upper thrust ring first inner spherical surface 246 and said upper bearing housing first outer spherical surface 267 are in contact; the lower thrust collar second inner spherical surface 546 is in contact with the lower bearing housing second outer spherical surface 567.

The polycrystalline diamond and hard alloy composite friction part is a cylindrical sheet-shaped polycrystalline diamond and hard alloy composite friction part with a chamfered edge;

the side chamfer cylindrical sheet polycrystalline diamond and hard alloy composite friction part side chamfer size is as follows: the distance c is 0.6mm and the angle α is 45 °.

Between the first radial sliding friction portion 132 and the upper radial sliding bearing rotor friction portion mounting hole 1319, between the second radial sliding friction portion 202 and the upper radial sliding bearing stator friction portion mounting hole 2010, between the third radial sliding friction portion 432 and the lower radial sliding bearing rotor friction portion mounting hole 4319, and between the fourth radial sliding friction portion 502 and the lower radial sliding bearing stator friction portion mounting hole 5010, they are welded together by a pressureless dip sintering brazing method using a solder and a flux.

The first axial sliding friction portion 152 and the upper axial sliding bearing rotor friction portion mounting hole 1512, the second axial sliding friction portion 212 and the upper axial sliding bearing stator friction portion mounting hole 2111, the third axial sliding friction portion 452 and the lower axial sliding bearing rotor friction portion mounting hole 4512, and the fourth axial sliding friction portion 512 and the lower axial sliding bearing stator friction portion mounting hole 5111 are welded together by flame brazing using a solder and a flux.

The number of the first and second

cylindrical dowel grooves

1316 and 4316 is 5 respectively; the resistance of the polycrystalline diamond and hard alloy composite friction part is less than 220 ohms.

Referring to fig. 3, 4, 5, 6, 7, 8, 9, 12, 14, 18, 21, 22, 23, 24, 27, 28, 29, 30, 31, 33, 38, 39, 40, 45, 46, 47, 48, 49 and 52, in a third embodiment, there is provided a dual axial acting spiral grooved sliding bearing assembly comprising an upper rotor assembly 1, an upper stator assembly 2, an upper range ring 3, a lower rotor assembly 4, a lower stator assembly 5 and a lower range ring 6. Wherein the content of the first and second substances,

the upper rotor assembly 1 comprises an inner hexagonal socket head cap screw 11, an O-shaped rubber sealing ring 12, an upper radial sliding bearing rotor 13, an oil filling plug 14, an upper axial thrust sliding bearing rotor 15 and an O-shaped rubber sealing ring 16; the upper radial sliding bearing rotor 13 includes an upper radial sliding bearing rotor base 131 and a first radial sliding friction portion 132; the upper axial thrust sliding bearing rotor 15 includes an upper axial thrust sliding bearing rotor base 151 and a first axial sliding friction portion 152;

said upper radial plain bearing rotor first outer cylindrical surface 1318 is provided with a first multi-start helical cooling groove 13111, said upper radial plain bearing rotor first inner cylindrical surface 1317 is provided with a first saddle-stitch cylindrical pin groove 1316;

The first outer cylindrical surface 2017 of the upper radial sliding bearing stator is provided with a first multi-head spiral groove 2013, and the second outer cylindrical surface 2016 of the upper radial sliding bearing stator is provided with a first external thread 2012; the upper bearing housing first inner cylindrical surface 268 is provided with a first single start helical groove 265.

The upper axial thrust sliding bearing stator base body 211 is provided with an inner hexagonal socket head screw hole 2118.

The upper push ring 24 is provided with a first inner conical surface 241, and the upper push ring first inner conical surface 241 is provided with a counter bore 247; the upper bearing seat 26 is provided with a first external conical surface 262; the upper radial elastic sleeve 28 is provided with an axial through hole 281.

The lower stator assembly 5 includes, but is not limited to, a lower radial plain bearing stator 50, a lower axial thrust plain bearing stator 51, a lower thrust ring 54, a lower thrust adjustment ring 53, a lower bearing seat 56, and a lower radial elastic sleeve 58; the lower radial sliding bearing stator 50 includes a lower radial sliding bearing stator base 501 and a fourth radial sliding friction portion 502; the lower thrust sliding bearing stator 51 includes a lower thrust sliding bearing stator base 511 and a fourth axial sliding friction portion 512; the third radial sliding friction part 432 and the fourth radial sliding friction part 502 form a lower radial bearing sliding friction pair, and the third axial sliding friction part 452 and the fourth axial sliding friction part 512 form a lower axial thrust bearing sliding friction pair; the third radial sliding friction portion 432 and the fourth radial sliding friction portion 502 are both cemented carbide friction portions, and the third axial sliding friction portion 452 and the fourth axial sliding friction portion 512 are polycrystalline diamond friction portions.

The lower radial plain bearing stator first outer cylindrical surface 5017 is provided with a second multi-start helical groove 5013, and the lower radial plain bearing stator second outer cylindrical surface 5016 is provided with a second outer thread 5012; the lower housing first inner cylindrical surface 568 is provided with a second single start helical groove 565.

The lower axial thrust sliding bearing stator base body 511 is provided with an inner hexagonal socket head screw hole 5118.

The lower thrust collar 54 is provided with a second inner conical surface 541, and the second inner conical surface 541 of the lower thrust collar is provided with a counter bore 547; the lower bearing seat 56 is provided with a second outer conical surface 562; the lower radial elastic sleeve 58 is provided with an axial through hole 581.

The upper stator assembly 2 further comprises an upper hexagon socket head cap screw 210, and the lower stator assembly further comprises a lower hexagon socket head cap screw 510; the upper radial sliding bearing stator second outer cylindrical surface first external thread 2012 is connected with the upper thrust ring first inner cylindrical surface first internal thread 243, and the upper thrust ring 24 is connected with the upper axial thrust sliding bearing stator 21 through the upper hexagon socket head cap screw 210; the upper radial sliding bearing stator 20 and the upper bearing seat 26 are connected together through the upper radial elastic sleeve 28; the second outer cylindrical surface second external thread 5012 of the lower radial sliding bearing stator is connected with the second inner cylindrical surface second internal thread 543 of the lower thrust collar, and the lower thrust collar 54 is connected with the lower axial thrust sliding bearing stator 51 through the lower hexagon socket head cap screw 510; the lower radial sliding bearing stator 50 and the lower bearing seat 56 are connected together by the lower radial elastic sleeve 58.

The first internal thread 243 and the first external thread 2012 are both right-hand threads; the second internal threads 543 and the second external threads 5012 are both left-hand threads.

The number of the first multi-start spiral groove 2013 and the number of the first multi-start spiral edge 283 are both 6, the lead is 1000mm, the rotation direction is right rotation, and the first multi-start spiral groove 2013 is matched with the first multi-start spiral edge 283; the number of the heads of the second multi-start spiral groove 5013 and the number of the heads of the second multi-start spiral ribs 583 are both 6, the lead is 1000mm, the rotation direction is right rotation, and the second multi-start spiral groove 5013 is matched with the second multi-start spiral ribs 583; the number of turns of the first single-ended helical groove 265 and the number of turns of the first single-ended helical ridge 282 are both 2 turns, the thread pitches are both 30mm, the rotation directions are both right-handed, and the first single-ended helical groove 265 is paired with the first single-ended helical ridge 282; the number of turns of the second single-end spiral groove 565 and the number of turns of the second single-end spiral rib 582 are 2 turns, the thread pitch is 30mm, the direction of rotation is right-handed rotation, and the second single-end spiral groove 565 is paired with the second single-end spiral rib 582.

The upper bearing housing external threads 266 are right-hand threads and the lower bearing housing external threads 566 are left-hand threads.

The polycrystalline diamond friction part is a cylindrical sheet-shaped polycrystalline diamond friction part with a chamfered edge; the side chamfer size of the side chamfer cylindrical sheet-shaped polycrystalline diamond friction part is as follows: the distance c is 0.6mm and the angle α is 45 °.

The number of the first and second saddle-stitch

cylindrical pin grooves

1316 and 4316 is 3, and the resistance of the polycrystalline diamond friction part is less than 220 ohms.

The number of the first multi-head spiral cooling groove 13111 is 12, the lead is 1000mm, and the rotation direction is right; the number of the heads of the second multi-head spiral cooling groove 43111 is 12, the lead is 1000mm, and the rotation direction is right.

It should be noted that, in the description of the present application, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no precedence between the two is intended or should be construed to indicate or imply relative importance. In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified.

The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.

The above description is only a few embodiments of the present invention, and although the embodiments of the present invention are described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A plain bearing, comprising: a rotor assembly, a stator assembly,

the stator assembly includes: the thrust adjusting device comprises a radial sliding bearing stator, an axial thrust sliding bearing stator, a thrust ring, a thrust adjusting ring, a bearing seat and a radial elastic sleeve; the radial sliding bearing stator comprises a radial stator base body and a second radial sliding friction part; the axial thrust sliding bearing stator comprises an axial stator base body and a second axial sliding friction part;

2. A dual-axial-action slide bearing assembly comprising an upper slide bearing and a lower slide bearing, the upper or lower slide bearing comprising the slide bearing according to claim 1.

3. The dual-axial-action plain bearing assembly of claim 2, wherein the upper slide bearing includes an upper rotor assembly and an upper stator assembly, the lower slide bearing includes a lower stator assembly and a lower rotor assembly, the upper rotor assembly comprising: an upper radial sliding bearing rotor and an upper axial thrust sliding bearing rotor; the upper radial sliding bearing rotor comprises an upper radial sliding bearing rotor base body and a first radial sliding friction part; the upper axial thrust sliding bearing rotor comprises an upper axial thrust sliding bearing rotor base body and a first axial sliding friction part;

4. A bi-axially acting plain bearing assembly according to claim 3 wherein the upper stator assembly further comprises an upper cylindrical pin, an upper socket head cap screw, or/and an upper locating key; the lower stator assembly further comprises a lower cylindrical pin, a lower inner hexagonal cylindrical head screw or/and a lower positioning key;

the fourth outer cylindrical surface of the upper radial sliding bearing stator is connected with the first inner cylindrical surface of the upper axial thrust sliding bearing stator through the upper cylindrical pin, and the first external thread of the second outer cylindrical surface of the upper radial sliding bearing stator is connected with the first internal thread of the first inner cylindrical surface of the upper thrust ring; or the second external thread of the third outer cylindrical surface of the upper radial sliding bearing stator is connected with the second internal thread of the second inner cylindrical surface of the upper axial thrust sliding bearing stator, or/and the upper axial thrust sliding bearing stator and the upper thrust ring are positioned through the upper positioning key; or the first external thread on the second outer cylindrical surface of the upper radial sliding bearing stator is connected with the first internal thread on the first inner cylindrical surface of the upper thrust ring, and the upper thrust ring is connected with the upper axial thrust sliding bearing stator through the upper hexagon socket head cap screw;

the upper radial sliding bearing stator is connected with the upper bearing seat through the upper radial elastic sleeve;

the fourth outer cylindrical surface of the lower radial sliding bearing stator is connected with the first inner cylindrical surface of the lower axial thrust sliding bearing stator through the lower cylindrical pin, and the second outer thread of the second outer cylindrical surface of the lower radial sliding bearing stator is connected with the second inner thread of the first inner cylindrical surface of the lower thrust collar; or the fourth external thread of the third external cylindrical surface of the lower radial sliding bearing stator is connected with the fourth internal thread of the second internal cylindrical surface of the lower axial thrust sliding bearing stator, or/and the lower axial thrust sliding bearing stator and the lower thrust ring are positioned through the lower positioning key; or the second external thread on the second external cylindrical surface of the lower radial sliding bearing stator is connected with the second internal thread on the first internal cylindrical surface of the lower thrust collar, and the lower thrust collar is connected with the lower axial thrust sliding bearing stator through the lower hexagon socket head cap screw;

the lower radial sliding bearing stator is connected with the lower bearing seat through the lower radial elastic sleeve.

5. A bi-axially acting plain bearing assembly according to claim 3 wherein the first internal thread, the first external thread, the third internal thread and the third external thread are right-hand threads; the second internal thread, the second external thread, the fourth internal thread and the fourth external thread are all left-hand threads;

the first radial sliding friction portion and the mounting hole of the rotor friction portion of the upper radial sliding bearing, the second radial sliding friction portion and the mounting hole of the stator friction portion of the upper radial sliding bearing, the third radial sliding friction portion and the mounting hole of the rotor friction portion of the lower radial sliding bearing, the fourth radial sliding friction portion and the mounting hole of the stator friction portion of the lower radial sliding bearing, the first axial sliding friction portion and the mounting hole of the rotor friction portion of the upper axial sliding bearing, the second axial sliding friction portion and the mounting hole of the stator friction portion of the upper axial sliding bearing, the third axial sliding friction portion and the mounting hole of the rotor friction portion of the lower axial sliding bearing, and the fourth axial sliding friction portion and the mounting hole of the stator friction portion of the lower axial sliding bearing are dip-brazed by using solder and flux, or flame brazed or induction brazed welded together.

6. A bi-axially acting plain bearing assembly according to claim 3 wherein said upper radially resilient sleeve and said lower radially resilient sleeve are each provided with 3 to 9 through holes in the axial direction; the upper radial elastic sleeve and the lower radial elastic sleeve are both made of fluororubber or nitrile butadiene rubber, and the Shore hardness is 65-85; a first multi-head spiral edge is arranged on the inner cylindrical surface of the upper radial elastic sleeve, and a second multi-head spiral edge is arranged on the inner cylindrical surface of the lower radial elastic sleeve; the outer cylindrical surface of the upper radial elastic sleeve is provided with a first single-head spiral edge, and the outer cylindrical surface of the lower radial elastic sleeve is provided with a second single-head spiral edge.

7. A bi-axially acting plain bearing assembly according to claim 3,

the number of the first multi-head spiral groove and the number of the first multi-head spiral edge are both 3-6, the lead is 1000mm, and the first multi-head spiral groove is matched with the first multi-head spiral edge; the number of the heads of the second multi-head spiral groove and the number of the heads of the second multi-head spiral edges are both 3-6, the lead is 1000mm, and the second multi-head spiral groove is matched with the second multi-head spiral edges; the number of turns of the first single-end spiral groove and the number of turns of the first single-end spiral edge are both 2 turns, the thread pitch is 25-35 mm, and the first single-end spiral groove is matched with the first single-end spiral edge; the number of turns of the second single-end spiral groove and the number of turns of the second single-end spiral edge are both 2 turns, the thread pitch is 25 mm-35 mm, and the second single-end spiral groove is matched with the second single-end spiral edge.

8. A bi-axial acting plain bearing assembly according to claim 3 wherein the upper bearing housing external thread is a right-hand thread; the external thread of the lower bearing seat is a left-hand thread; the first inner conical surface of the upper thrust ring is contacted with the first outer conical surface of the upper bearing seat, or the first inner spherical surface of the upper thrust ring is contacted with the first outer spherical surface of the upper bearing seat; and the second inner conical surface of the lower thrust ring is in contact with the second outer conical surface of the lower bearing seat, or the second inner spherical surface of the lower thrust ring is in contact with the second outer spherical surface of the lower bearing seat.

9. A bi-axial acting sliding bearing assembly according to claim 3 wherein the polycrystalline diamond rubbing portion is a chamfered cylindrical sheet-like polycrystalline diamond rubbing portion, or/and a chamfered cylindrical sheet-like polycrystalline diamond rubbing portion; the polycrystalline diamond and hard alloy composite friction part is a cylindrical sheet-shaped polycrystalline diamond and hard alloy composite friction part with a chamfered edge, or/and a cylindrical sheet-shaped polycrystalline diamond and hard alloy composite friction part with a chamfered edge; the side chamfer size of the side chamfer cylindrical sheet-shaped polycrystalline diamond friction part is as follows: the distance c is 0.25 mm-1.50 mm, the angle alpha is 25-65 degrees, and the size of the edge rounding cylindrical sheet-shaped polycrystalline diamond friction part is as follows: the radius r of the circular arc is 0.25 mm-1.50 mm; the side chamfer cylindrical sheet polycrystalline diamond and hard alloy composite friction part side chamfer size is as follows: the distance c is 0.25 mm-1.50 mm, the angle alpha is 25-65 degrees, and the size of the edge fillet cylindrical sheet-shaped polycrystalline diamond and hard alloy composite friction part is as follows: the radius r of the circular arc is 0.25 mm-1.50 mm.

10. A biaxial acting sliding bearing assembly as recited in claim 3, wherein the first, third and fifth sewing cylinder pin grooves are 2 to 6 in number, respectively, and the second, fourth and sixth sewing cylinder pin grooves are 2 to 6 in number, respectively; the resistance of the polycrystalline diamond friction part and the resistance of the polycrystalline diamond and hard alloy composite friction part are all less than 380 ohms; the drill bit rotates clockwise, the number of the first multi-head spiral cooling groove is 3-12, the lead is 1000mm, and the rotation direction is right rotation; the number of the heads of the second multi-head spiral cooling groove is 3-12, the lead is 1000mm, and the rotation direction is right rotation.