CN113027923B

CN113027923B - Biaxial acting plain bearing assembly and plain bearing therefor

Info

Publication number: CN113027923B
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: 2024-05-31
Anticipated expiration: 2041-04-29
Also published as: CN113027923A

Abstract

The invention discloses a biaxial action 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 comprises a radial rotor base body and a first radial sliding friction part; 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 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 radial sliding friction part and the second radial sliding friction part are both made of hard alloy. The invention can prevent the friction part from cracking, thereby prolonging the service life of the sliding bearing.

Description

Biaxial acting plain bearing assembly and plain bearing therefor

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 double axial actions and a sliding bearing thereof.

Background

In the 90 s of the 20 th century, the rotary steerable drilling technology was developed abroad, the traditional operation mode of the directional well technology on the control of the well track was changed, the rotary steerable drilling has made a breakthrough progress in the aspects of operation efficiency and safety, and the rotary steerable drilling has particularly played a significant advantage in the large-displacement directional drilling technology. Rotary steerable drilling system prototypes have been developed and tested in small batches, but problems such as short working life, low build rate, etc. still exist.

The downhole tool of the rotary steering drilling system is divided into a steering nipple, an MWD module, a two-way communication and power module 3 and a large module. The steering nipple is a downhole decision-making and executing mechanism of the rotary steering drilling system when directional drilling is carried out under the rotation condition, and is used for transmitting the torque of the rotary table to the drill bit and controlling the size and direction of the lateral force of the drill bit for laterally cutting the stratum. The guide nipple is complex in structure, complex in working condition and complex in bearing load, the performance and the service life of the guide nipple directly determine the advantages and disadvantages of the rotary guide drilling system, and the guide nipple 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 cylinder, a guide 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 are rotatable relative to each other. When the guide nipple is used, the upper hard alloy bearing assembly and the lower hard alloy bearing assembly act together, so that the friction force between the end face and the inner and outer radial directions when the rotary mandrel and the lower joint rotate relative to the non-rotary outer cylinder is reduced, the wear resistance of the guide nipple is improved, and the rotary mandrel is centered.

A large amount of rock fragments are generated when the petroleum and natural gas drilling tool is used for drilling and breaking the rock, and in order to bring the rock fragments to the ground while breaking the rock, a modern rotary drilling mode generally adopts a drilling fluid with high solid phase content to circulate the rock fragments to the ground; furthermore, the downhole formation temperature typically increases with increasing well depth at a 3 ℃/100m gradient, i.e., 150 ℃ formation rock temperature if drilled to 5000m well depth and 240 ℃ formation rock temperature if drilled to 8000m well depth. Because the rotary steering drilling system works under the conditions of underground high temperature and high solid phase content drilling fluid cooling lubrication, the existing radial righting hard alloy sliding bearing is unreasonable in design of a longitudinal/transverse cooling lubrication groove (patent ZL 2020200588045.6), the gap between a radial stator (static ring) and a radial rotor (dynamic ring) is between 0.1mm and 0.5mm, the gap between the outer diameter of a steering nipple of the rotary steering drilling system and the inner wall of a shaft (annular gap) is between 10.0mm and 50.0mm, most drilling fluid (cooling lubrication medium) flows along the annular space with smaller resistance when the drilling fluid flows from the bottom to the ground through an overflow surface where a bearing assembly is located, and only a small amount of cooling lubrication medium can flow through the gap between the stator and the rotor, so that friction heat of a radial friction part and an axial friction part cannot be taken away in time, and therefore, the hard alloy at the friction part often has cracking phenomenon, and the working reliability and service life of the rotary steering drilling system are seriously affected.

Accordingly, there is a need for a new dual axial action helical groove plain bearing assembly that better meets the high operational reliability and long life use requirements of rotary steerable drilling systems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a biaxial action sliding bearing assembly and a sliding bearing thereof, which can prevent cracks of friction parts, 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 sliding 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 comprises a radial rotor base body and a first radial sliding friction part; 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 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 slide 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 dual-acting slide bearing assembly comprising: an upper slide bearing and a lower slide bearing, the upper slide bearing or the 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 slide bearing rotor and an upper axial thrust slide 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;

the first outer cylindrical surface of the upper radial sliding bearing rotor is provided with a first multi-head spiral cooling groove, and the first inner cylindrical surface of the upper radial sliding bearing rotor is provided with a first saddle-stitch cylindrical pin groove;

The upper stator assembly includes: an upper radial sliding bearing stator, an upper axial thrust sliding bearing stator, an upper thrust ring, an upper thrust adjusting ring, an upper bearing seat and an upper radial elastic sleeve; 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 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;

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

a fifth saddle cylindrical pin groove is formed in the first inner cylindrical surface of the upper axial thrust sliding bearing stator, or a third inner 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;

The first inner cylindrical surface of the upper thrust ring is provided with a first inner thread; the upper thrust 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 thrust 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 slide bearing rotor and a lower axial thrust slide 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;

The first outer cylindrical surface of the lower radial sliding bearing rotor is provided with a second multi-head spiral cooling groove; the first inner cylindrical surface of the lower radial sliding bearing rotor is provided with a second saddle cylindrical pin groove;

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 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;

The first outer cylindrical surface of the lower radial sliding bearing stator is provided with a second multi-head spiral groove, the second outer cylindrical surface of the lower radial sliding bearing stator is provided with a second external thread, or/and the fourth outer cylindrical surface of the lower radial sliding bearing stator is provided with a fourth saddle cylindrical pin groove; or a third outer cylindrical surface of the lower radial sliding bearing stator is provided with fourth external threads; the first inner cylindrical surface of the lower bearing seat is provided with a second single-head spiral groove;

A sixth saddle cylindrical pin groove is formed in the first inner cylindrical surface of the lower axial thrust sliding bearing stator, or a fourth inner thread is formed in the second inner cylindrical surface of the lower axial thrust sliding bearing stator, or an inner hexagonal cylindrical head screw hole is formed in the lower axial thrust sliding bearing stator base body;

the first inner cylindrical surface of the lower thrust ring is provided with a second inner thread; 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

When the rotary guide pup joint rotary mandrel rotates clockwise relative to the non-rotary outer cylinder, the right-handed first multi-head spiral cooling groove on the first outer cylindrical surface of the upper radial sliding bearing rotor integrally connected with the rotary mandrel generates lifting force from bottom to top on drilling fluid entering the cooling groove, so that the effect of a screw pump is generated, more drilling fluid circularly flowing from bottom to top in a shaft annulus can enter a gap between the upper rotor assembly and the upper stator assembly under the suction action of the right-handed first multi-head spiral cooling groove, friction heat circulation of the sliding bearing is taken away to the greatest extent, a friction part is prevented from cracking, the service life of the sliding bearing is prolonged, and the rotary guide drilling requirement is met.

Drawings

The invention will be further described with reference to the drawings and embodiments.

FIGS. 1 to 3 are schematic cross-sectional views of a dual-axis helical groove sliding bearing assembly;

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 an upper and lower radial slide bearing rotor;

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

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

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

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

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

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

FIG. 16 is a schematic view of an upper thrust collar structure;

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

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

FIG. 21 is a schematic cross-sectional view of an upper housing;

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

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

FIG. 24 is a schematic view of a lower bearing housing structure;

FIG. 25 is a schematic cross-sectional view of an upper housing;

FIG. 26 is a schematic view of a cross-sectional structure of a lower bearing housing;

FIG. 27 is a schematic cross-sectional view of an upper radial elastomeric sleeve;

FIG. 28 is a schematic view of a lower radial spring sleeve configuration;

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

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

FIGS. 31 and 32 are schematic cross-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 illustration 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 construction;

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 schematic cross-sectional view of a lower axial thrust sliding bearing stator;

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

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 rounded-edge cylindrical polycrystalline diamond friction portion;

FIG. 52 is a schematic illustration of an edge chamfer cylindrical piece shaped polycrystalline diamond friction portion structure;

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

Fig. 54 is a schematic diagram of a composite friction portion of an edge chamfer polycrystalline diamond and cemented carbide.

The reference numerals of the above figures:

1. An upper rotor assembly; 11. a hexagon socket head cap screw; 12. an O-shaped rubber sealing ring; 13. an upper radial plain bearing rotor; 131. an upper radial slide bearing rotor base; 1311. a second outer cylindrical surface of the upper radial plain bearing rotor; 1316. a first saddle-stitch cylindrical pin slot; 1317. a first inner cylindrical surface of the upper radial plain bearing rotor; 1318. a first outer cylindrical surface of the upper radial plain bearing rotor; 1319. an upper radial sliding bearing rotor friction portion mounting hole; 13111. a first multi-headed helical cooling bath; 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; 1511. a first inner cylindrical surface of an upper axial thrust sliding bearing rotor; 1512. an upper axial thrust sliding bearing rotor friction portion 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 slide bearing stator; 201. an upper radial slide bearing stator base; 2010. an upper radial sliding bearing stator friction part mounting hole; 2011. a third saddle cylindrical pin slot; 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 slide bearing stator; 2017. a first outer cylindrical surface of the upper radial sliding bearing stator; 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 base; 2111. an upper axial thrust sliding bearing stator friction portion mounting hole; 2113. a first inner cylindrical surface of an upper axial thrust sliding bearing stator; 2114. fifth saddle-stitch cylindrical pin grooves; 2115. an upper axial thrust sliding bearing stator locating keyway; 2116. a second inner cylindrical surface of the upper axial thrust sliding bearing stator; 2117. a third internal thread; 2118. the upper axial thrust sliding bearing stator is provided with hexagonal cylindrical head screw holes; 2119. a first end surface of the upper axial thrust sliding bearing stator; 212. a second axial sliding friction portion; 22. a cylindrical pin; 23. a thrust adjusting ring is arranged; 24. an upper thrust collar; 241. a first inner conical surface of the upper thrust collar; 243. a first internal thread; 244. a first inner cylindrical surface of the upper thrust collar; 245. a third positioning key groove of the upper thrust ring; 246. the first inner spherical surface of the upper thrust ring; 247. a thrust collar counterbore; 249. an upper thrust collar first end face; 25. an O-shaped rubber sealing ring; 26. an upper bearing seat; 262. the first outer conical surface of the upper bearing seat; 265. a first single-ended helical groove; 266. an external thread of the upper bearing seat; 267. the upper bearing seat is provided with a first outer spherical surface; 268. the first inner cylindrical surface of the upper bearing seat; 27. an O-shaped rubber sealing ring; 28. an upper radial elastic sleeve; 281. an upper radial elastic sleeve axial through hole; 282. a first single-start helical rib; 283. a first multi-start helical rib; 284. an inner cylindrical surface of the upper radial elastic sleeve; 285. an outer cylindrical surface of the upper radial elastic sleeve; 29. a positioning key is arranged; 210. a hexagon socket head cap screw;

3. An upper baffle ring;

4. A lower rotor assembly; 41. a hexagon socket head cap screw; 42. an O-shaped rubber sealing ring; 43. a lower radial slide bearing rotor; 431. a lower radial slide bearing rotor base; 4311. a lower radial plain bearing rotor second outer cylindrical surface; 4316. a second saddle cylindrical pin slot; 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 portion mounting hole; 43111. a second multi-head spiral cooling groove; 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 base; 4511. a lower axial thrust sliding bearing rotor first inner cylindrical surface; 4512. a lower axial thrust sliding bearing rotor friction portion 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 slide bearing stator; 501. a lower radial slide bearing stator base; 5010. a lower radial sliding bearing stator friction part mounting hole; 5011. fourth pin slot; 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 lower radial slide bearing stator second outer cylindrical surface; 5017. a lower radial slide 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 base; 5111. a lower axial thrust sliding bearing stator friction portion mounting hole; 5113. a lower axial thrust sliding bearing stator first inner cylindrical surface; 5114. sixth, a cylindrical pin slot is formed; 5115. a lower axial thrust sliding bearing stator positioning keyway; 5116. a lower axial thrust sliding bearing stator second inner cylindrical surface; 5117. a fourth internal thread; 5118. a lower axial thrust sliding bearing stator inner hexagonal cylindrical head screw hole; 5119. a lower axial thrust sliding bearing stator first end face; 512. a fourth axial sliding friction portion; 52. a cylindrical pin; 53. a lower thrust adjustment ring; 54. a lower thrust collar; 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 positioning key groove of the lower thrust ring; 546. the second inner spherical surface of the lower thrust ring; 547. a lower thrust collar 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. external threads of the lower bearing seat; 567. a lower bearing seat second outer spherical surface; 568. the first inner cylindrical surface of the lower bearing seat; 58. a lower radial elastic sleeve; 581. a lower radial elastic sleeve axial through hole; 582. a second single-ended helical rib; 583. a second multi-start helical rib; 584. an inner cylindrical surface of the lower radial elastic sleeve; 585. an outer cylindrical surface of the lower radial elastic sleeve; 59. a lower positioning key; 510. a hexagon socket head cap screw;

6. and a lower baffle ring.

R, rounding radius of the friction part edge; c. chamfering distance of the edge of the friction part; alpha, chamfering angle of the friction part edge.

Detailed Description

The technical solution of the present application will be described in detail below with reference to the attached drawings and specific embodiments, it should be understood that these embodiments are only for illustrating the present application and not for limiting the scope of the present application, and various modifications of equivalent forms of the present application will fall within the scope of the appended claims after reading the present application.

In this specification there is provided a slide bearing which, when applied in a biaxially acting slide bearing assembly, may comprise an upper slide bearing and a lower slide bearing, said upper or lower slide bearing comprising a slide bearing as described above. In this specification, a description will be given of a biaxial-acting plain bearing assembly to which the plain bearing assembly is applied.

Referring to fig. 1-54 in combination, embodiments of the present invention provide a dual axial actuation helical groove slide bearing assembly comprising: upper and lower slide bearings are used in pairs. Wherein, upper slide bearing includes: an upper rotor assembly 1, an upper stator assembly 2, and an upper baffle ring 3; the lower slide bearing includes: a lower rotor assembly 4, a lower stator assembly 5 and a lower baffle ring 6.

The main difference between the upper sliding bearing and the lower sliding bearing is that the rotation directions of the connecting threads are opposite, and other structures can be mutually referred. In the present specification, the above description will be mainly given taking a slide bearing as an example. The lower slide bearing is identical to the upper slide bearing in terms of structure, and reference is made to the upper slide bearing, and the application will not be described in detail 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 slide bearing rotor 13 includes an upper radial slide bearing rotor base 131 and a first radial slide 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 slide bearing rotor first outer cylindrical surface 1318 is provided with a first multi-start spiral cooling groove 13111. The direction of rotation or extension of the first multi-headed helical cooling groove 13111 matches the direction of bit rotation. For example, in most cases, the first multi-start helical cooling slot 13111 turns right as the drill bit is rotated clockwise. In some special cases, if the drill bit is rotated counterclockwise, the direction of rotation of the first multi-headed spiral cooling groove 13111 is left-handed.

Specifically, the starting point position of the first multi-head spiral cooling groove 13111 is lower than the axially lowest end position of the first radial sliding friction portion 132, and the ending point position of the first multi-head spiral cooling groove 13111 is higher than the axially highest end position of the first radial sliding friction portion 132, i.e. the axial length of the first multi-head spiral cooling groove 13111 is longer (5-10 mm) than the axial length of the first outer cylindrical surface 1318 of the upper radial sliding bearing rotor; the width of the first multi-head spiral cooling groove 13111 is generally set to 3 to 5mm, and the depth of the first multi-head spiral cooling groove 13111 is generally set to 1 to 2mm; the lead angle of the first multi-head spiral cooling groove 13111 needs to be comprehensively considered according to the axial length and the diameter of the first outer cylindrical surface 1318 of the upper radial sliding bearing rotor and the specific number of the first multi-head spiral cooling groove 13111, and is generally set to 60-70 degrees, so that the requirements that all spiral cooling grooves on the first outer cylindrical surface 1318 of the upper radial sliding bearing rotor are not overlapped when projected to the same plane in the circumferential direction (namely, the second radial sliding friction part 202 of the upper radial sliding bearing stator does not fall into any spiral cooling groove when the upper radial sliding bearing rotor 13 rotates and works all the time) are met. In this way, it is ensured that a sufficient number of first radial sliding friction portions 132 can be fitted to the first outer cylindrical surface 1318 of the upper radial sliding bearing rotor, and a sufficiently large cooling medium (drilling fluid) flow area is ensured. When the rotary guide pup joint rotary mandrel rotates clockwise relative to the non-rotary outer cylinder, the right-handed first multi-head spiral cooling groove 13111 on the first outer cylindrical surface of the upper radial sliding bearing rotor which is connected with the rotary mandrel into a whole generates lifting force from bottom to top on drilling fluid which enters the cooling groove, the effect of a screw pump is generated, more drilling fluid which circularly flows from bottom to top in a shaft annulus can enter a gap between the upper rotor assembly 1 and the upper stator assembly 2 under the suction action of the right-handed first multi-head spiral cooling groove 13111, friction heat circulation of the sliding bearing is taken away to the greatest extent, a friction pair is cooled, cracks of a friction part are prevented, the service life of the sliding bearing is prolonged, and the rotary guide drilling requirement is met.

Referring to fig. 6 in combination, the upper radial slide bearing rotor first inner cylindrical surface 1317 is provided with a first saddle cylindrical pin slot 1316.

The upper stator assembly 2 includes: an upper radial slide bearing stator 20, an upper axial thrust slide bearing stator 21, an upper thrust collar 24, an upper thrust adjustment collar 23, an upper bearing housing 26 and an upper radial elastomeric sleeve 28. The upper radial slide bearing stator 20 includes an upper radial slide bearing stator base 201 and a second radial slide 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 and second radial sliding friction portions 132 and 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 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 in combination, a first multi-start helical groove 2013 is formed in a first outer cylindrical surface 2017 of the upper radial sliding bearing stator. 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 in the first multi-start spiral groove 2013, so as to connect the upper radial sliding bearing stator 20 with the upper radial elastic sleeve 28. The provision of the first multi-start helical groove 2013 in the first outer cylindrical surface 2017 of the upper radial slide bearing stator base 201 is presently the best choice due to the thin wall thickness of the upper radial slide bearing stator base 201.

The upper radial slide bearing stator second outer cylindrical surface 2016 is provided with first outer threads 2012. The upper radial slide bearing stator third outer cylindrical surface 2019 is provided with third outer threads 2018. The fourth outer cylindrical surface 2015 of the upper radial sliding bearing stator is provided with a third saddle cylindrical pin slot 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 saddle cylindrical pin slot 2114; or the second inner cylindrical surface 2116 of the upper axial thrust sliding bearing stator is provided with a third inner 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 211 is provided with an inner hexagonal cylindrical head screw hole 2118.

The first inner cylindrical surface 244 of the upper thrust ring is provided with a first internal thread 243; the first end surface 249 of the upper thrust collar is provided with a third positioning key slot 245; the upper thrust ring 24 is provided with a first inner conical surface 241 or a first inner spherical surface 246 and/or the upper 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 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 slide bearing rotor 43 includes a lower radial slide bearing rotor base 431 and a third radial slide friction portion 432; the lower axial thrust sliding bearing rotor 45 includes a lower axial thrust sliding bearing rotor base 451 and a third axial sliding friction portion 452.

The first outer cylindrical surface 4318 of the lower radial sliding bearing rotor is provided with a second multi-head spiral cooling groove 43111; the lower radial slide bearing rotor first inner cylindrical surface 4317 is provided with a second saddle cylindrical pin slot 4316.

The lower stator assembly 5 includes: a lower radial slide bearing stator 50, a lower axial thrust slide 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 axial thrust sliding bearing stator 51 includes a lower axial thrust sliding bearing stator base 511 and a fourth axial sliding friction portion 512; the third radial sliding friction portion 432 and the fourth radial sliding friction portion 502 form a lower radial bearing sliding friction pair, and the third axial sliding friction portion 452 and the fourth axial sliding friction portion 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 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 first outer cylindrical surface 5017 of the lower radial sliding bearing stator is provided with a second multi-head spiral groove 5013, the second outer cylindrical surface 5016 of the lower radial sliding bearing stator is provided with a second outer thread 5012, the third outer cylindrical surface 5019 of the lower radial sliding bearing stator is provided with a fourth outer thread 5018, and the fourth outer cylindrical surface 5015 of the lower radial sliding bearing stator is provided with a fourth riding cylindrical pin groove 5011; the lower bearing 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 saddle cylindrical pin groove 5114; or the second inner cylindrical surface 5116 of the lower axial thrust sliding bearing stator is provided with a fourth inner thread 5117, or/and the first end surface 5119 of the lower axial thrust sliding bearing stator is provided with a second positioning key groove 5115; or the lower axial thrust sliding bearing stator base 511 is provided with an inner hexagonal cylindrical head screw hole 5118.

The lower thrust ring first inner cylindrical surface 544 is provided with a second internal thread 543; the first end surface 549 of the lower thrust ring is provided with a fourth locating key slot 545; the lower thrust ring 54 is provided with a second inner conical surface 541 or a second inner spherical surface 546, and/or the lower thrust ring second inner conical surface 541 is provided with a counterbore 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 have a space to elastically deform when an external force is applied, thereby playing a role in shock absorption.

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

In the sliding bearing assembly provided by the application, the friction parts of the upper radial bearing sliding friction pair and the lower radial bearing sliding friction pair are hard alloy friction parts, and the friction parts of the upper axial thrust bearing sliding friction pair and the lower axial thrust bearing sliding friction pair are polycrystalline diamond friction parts or/and polycrystalline diamond and hard alloy composite friction parts. Because the first outer cylindrical surface 1318 of the upper radial sliding bearing rotor is provided with the right-hand 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-hand second multi-head spiral cooling groove 43111, when the rotary guide sub rotary mandrel rotates clockwise relative to the non-rotary outer cylinder, the right-hand 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, the right-hand 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 lifting force from bottom to top on drilling fluid which enters the cooling groove, the effect of a screw pump is generated, more drilling fluid in a shaft annulus can enter gaps between the lower rotor assembly 5 and the lower stator assembly 4 and between the upper rotor assembly 1 and the upper stator assembly 2 under the action of the suction force of the right-hand second multi-head spiral cooling groove 43111, and the friction parts are cooled in time, so that cracks are prevented, and the service life of the rotary guide drilling system is prolonged.

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

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, and 52, a first embodiment provides a dual axial actuation helical groove slide bearing assembly comprising an upper rotor assembly 1, an upper stator assembly 2, an upper baffle ring 3, a lower rotor assembly 4, a lower stator assembly 5, and a lower baffle ring 6.

The upper rotor assembly 1 comprises an inner hexagonal cylindrical head screw 11, an O-shaped rubber sealing ring 12, an upper radial sliding bearing rotor 13, an oil injection plug 14, an upper axial thrust sliding bearing rotor 15 and an O-shaped rubber sealing ring 16; the upper radial slide bearing rotor 13 includes an upper radial slide bearing rotor base 131 and a first radial slide 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 slide bearing rotor first outer cylindrical surface 1318 is provided with a first multi-start spiral cooling groove 13111, and the upper radial slide bearing rotor first inner cylindrical surface 1317 is provided with a first saddle cylindrical pin groove 1316.

The upper stator assembly 2 includes, but is not limited to, an upper radial slide bearing stator 20, an upper axial thrust slide bearing stator 21, an upper thrust collar 24, an upper thrust adjustment collar 23, an upper bearing seat 26, and an upper radial elastomeric sleeve 28; the upper radial slide bearing stator 20 includes an upper radial slide bearing stator base 201 and a second radial slide 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 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 outer thread 2012, and the fourth outer cylindrical surface 2015 of the upper radial sliding bearing stator is provided with a third saddle cylindrical pin groove 2011; 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 first inner cylindrical surface 2113 is provided with fifth saddle cylindrical pin slots 2114.

The first inner cylindrical surface 244 of the upper thrust ring is provided with a first inner thread 243, and the upper thrust ring 24 is provided with a first inner conical surface 241; the upper bearing seat 26 is provided with a first outer 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 cylindrical 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 slide bearing rotor 43 includes a lower radial slide bearing rotor base 431 and a third radial slide friction portion 432; the lower axial thrust sliding bearing rotor 45 includes a lower axial thrust sliding bearing rotor base 451 and a third axial sliding friction portion 452.

The lower stator assembly 5 includes: a lower radial slide bearing stator 50, a lower axial thrust slide 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 axial thrust sliding bearing stator 51 includes a lower axial thrust sliding bearing stator base 511 and a fourth axial sliding friction portion 512; the third radial sliding friction portion 432 and the fourth radial sliding friction portion 502 form a lower radial bearing sliding friction pair, and the third axial sliding friction portion 452 and the fourth axial sliding friction portion 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 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 first outer cylindrical surface 5017 of the lower radial sliding bearing stator is provided with a second multi-head spiral groove 5013, the second outer cylindrical surface 5016 of the lower radial sliding bearing stator is provided with a second outer thread 5012, and the fourth outer cylindrical surface 5015 of the lower radial sliding bearing stator is provided with a fourth saddle cylindrical pin groove 5011; the lower bearing 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 saddle cylindrical pin groove 5114.

The first inner cylindrical surface 544 of the lower thrust ring is provided with a second inner thread 543, and the lower thrust ring 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 the hexagon socket head cap screw 11, and meanwhile, the second outer cylindrical surface 1311 of the upper radial sliding bearing rotor and the first inner cylindrical surface 1511 of the upper axial thrust sliding bearing rotor are in interference fit; the lower radial sliding bearing rotor 43 and the lower axial sliding bearing rotor 45 in the lower rotor assembly 4 are connected together through the hexagon socket head cap screw 41, and meanwhile, the second outer cylindrical surface 4311 of the lower radial sliding bearing rotor and the first inner cylindrical surface 4511 of the lower axial sliding bearing rotor are in interference fit.

The upper stator assembly 2 further includes an upper cylindrical pin 22, and the lower stator assembly further includes a lower cylindrical pin 52; the fourth outer cylindrical surface 2015 of the upper radial sliding bearing stator is connected with the first inner cylindrical surface 2113 of the upper axial sliding bearing stator through the upper cylindrical pin 22, and meanwhile, the fourth outer cylindrical surface 2015 of the upper radial sliding bearing stator is in interference fit with the first inner cylindrical surface 2113 of the upper axial sliding bearing stator; the second outer cylindrical surface first external thread 2012 of the upper radial sliding bearing stator is connected with the first inner cylindrical surface first internal thread 243 of the upper thrust collar; 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 sliding bearing stator through the lower cylindrical pin 52, and meanwhile, 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 sliding bearing stator through the lower cylindrical pin 52 into 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 ring; 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-handed 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 hardness of 75; the upper radial elastic sleeve inner cylindrical surface 284 is provided with a first multi-start spiral edge 283, and the lower radial elastic sleeve inner cylindrical surface 584 is provided with a second multi-start spiral edge 583; the upper radial elastic sleeve outer cylindrical surface 285 is provided with a first single-start helical rib 282 and the lower radial elastic sleeve outer cylindrical surface 585 is provided with a second single-start helical rib 582.

The number of the first multi-head spiral grooves 2013 and the number of the first multi-head spiral ribs 283 are 4, the leads are 1000mm, the spiral directions are right-handed, and the first multi-head spiral grooves 2013 are matched with the first multi-head spiral ribs 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 leads are both 1000mm, the spiral directions are both right-handed, 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-head spiral groove 265 and the number of turns of the first single-head spiral rib 282 are 2, the pitch is 30mm, the rotation directions are all right-handed, and the first single-head spiral groove 265 is matched with the first single-head spiral rib 282; the number of turns of the second single-end spiral grooves 565 and the number of turns of the second single-end spiral ribs 582 are 2, the pitch is 30mm, the rotation directions are all right-handed, and the second single-end spiral grooves 565 are paired with the second single-end spiral ribs 582.

The external thread 266 of the upper bearing seat is a right-handed 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 collar second inner conical surface 541 is in contact with the lower housing second outer conical surface 562.

The polycrystalline diamond friction part is a cylindrical flaky polycrystalline diamond friction part with a chamfer edge.

The edge chamfer dimension of the edge chamfer cylindrical flaky polycrystalline diamond friction part is as follows: distance c=0.5 mm, angle α=45°.

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

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

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

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, a second embodiment provides a dual-axial-action helical groove sliding bearing assembly comprising an upper rotor assembly 1, an upper stator assembly 2, an upper retainer ring 3, a lower rotor assembly 4, a lower stator assembly 5 and a lower retainer ring 6.

The upper stator assembly 2 includes, but is not limited to, an upper radial slide bearing stator 20, an upper axial thrust slide bearing stator 21, an upper thrust collar 24, an upper thrust adjustment collar 23, an upper bearing seat 26, and an upper radial elastomeric sleeve 28; the upper radial slide bearing stator 20 includes an upper radial slide bearing stator base 201 and a second radial slide 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 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-start spiral groove 2013, and the third outer cylindrical surface 2019 of the upper radial sliding bearing stator is provided with a third outer thread 2018; 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 second inner cylindrical surface 2116 is provided with a third internal thread 2117 and the upper axial thrust sliding bearing stator first end surface 2119 is provided with a first locating key slot 2115.

The upper thrust ring first end face 249 is provided with a third locating key slot 245, and the upper thrust ring 24 is provided with a first inner spherical surface 246; the upper bearing seat 26 is provided with a first outer spherical 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 slide bearing stator 50, a lower axial thrust slide bearing stator 51, a lower thrust collar 54, a lower thrust adjustment collar 53, a lower bearing seat 56, and a lower radial elastomeric 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 axial thrust sliding bearing stator 51 includes a lower axial thrust sliding bearing stator base 511 and a fourth axial sliding friction portion 512; the third radial sliding friction portion 432 and the fourth radial sliding friction portion 502 form a lower radial bearing sliding friction pair, and the third axial sliding friction portion 452 and the fourth axial sliding friction portion 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 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 first outer cylindrical surface 5017 of the lower radial sliding bearing stator is provided with a second multi-head spiral groove 5013, and the third outer cylindrical surface 5019 of the lower radial sliding bearing stator is provided with a fourth outer thread 5018; the lower bearing housing first inner cylindrical surface 568 is provided with a second single-start helical groove 565.

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

The first end surface 549 of the lower thrust ring is provided with a fourth locating key slot 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 includes an upper detent 29 and the lower stator assembly 5 further includes a lower detent 59; the third external thread 2018 of the third external cylindrical surface of the upper radial sliding bearing stator is connected with the third internal thread 2117 of the second internal cylindrical surface of the upper axial sliding bearing stator, and the upper axial sliding bearing stator 21 and the upper thrust ring 24 are positioned by 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 third outer cylindrical surface fourth external thread 5018 of the lower radial sliding bearing stator is connected with the second inner cylindrical surface fourth internal thread 5117 of the lower axial sliding bearing stator, and the lower axial 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 thread 2117 and the third external thread 2018 are both right-handed threads; the fourth internal thread 5117 and the fourth external thread 5018 are both left-handed threads.

The number of the first multi-head spiral grooves 2013 and the number of the first multi-head spiral ribs 283 are 5, the leads are 1000mm, the spiral directions are right-handed, and the first multi-head spiral grooves 2013 are matched with the first multi-head spiral ribs 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 5, the leads are 1000mm, the spiral directions are right-handed, 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-head spiral groove 265 and the number of turns of the first single-head spiral rib 282 are 2, the pitch is 30mm, the rotation directions are all right-handed, and the first single-head spiral groove 265 is matched with the first single-head spiral rib 282; the number of turns of the second single-end spiral grooves 565 and the number of turns of the second single-end spiral ribs 582 are 2, the pitch is 30mm, the rotation directions are all right-handed, and the second single-end spiral grooves 565 are paired with the second single-end spiral ribs 582.

The upper thrust collar first inner sphere 246 is in contact with the upper housing first outer sphere 267; the lower thrust collar second inner spherical surface 546 is in contact with the lower housing second outer spherical surface 567.

The polycrystalline diamond and hard alloy composite friction part is a cylindrical chamfer angle sheet-shaped polycrystalline diamond and hard alloy composite friction part;

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

The first radial sliding friction part 132 and the upper radial sliding bearing rotor friction part mounting hole 1319, the second radial sliding friction part 202 and the upper radial sliding bearing stator friction part mounting hole 2010, the third radial sliding friction part 432 and the lower radial sliding bearing rotor friction part mounting hole 4319, and the fourth radial sliding friction part 502 and the lower radial sliding bearing stator friction part mounting hole 5010 are welded together by using a non-pressure dip sintering brazing method through a solder and a flux.

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

The number of the first riding cylindrical pin grooves 1316 and the second riding cylindrical pin grooves 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, a dual axial actuation helical groove slide bearing assembly is provided in a third embodiment comprising an upper rotor assembly 1, an upper stator assembly 2, an upper baffle ring 3, a lower rotor assembly 4, a lower stator assembly 5 and a lower baffle ring 6. Wherein,

The upper rotor assembly 1 comprises an inner hexagonal cylindrical head screw 11, an O-shaped rubber sealing ring 12, an upper radial sliding bearing rotor 13, an oil injection plug 14, an upper axial thrust sliding bearing rotor 15 and an O-shaped rubber sealing ring 16; the upper radial slide bearing rotor 13 includes an upper radial slide bearing rotor base 131 and a first radial slide 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 first outer cylindrical surface 1318 of the upper radial sliding bearing rotor is provided with a first multi-head spiral cooling groove 13111, and the first inner cylindrical surface 1317 of the upper radial sliding bearing rotor is provided with a first slotted 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 211 is provided with an inner hexagonal cylindrical head screw hole 2118.

The upper thrust ring 24 is provided with a first inner conical surface 241, the upper thrust ring first inner conical surface 241 being provided with a counterbore 247; the upper bearing seat 26 is provided with a first outer 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 slide bearing stator 50, a lower axial thrust slide bearing stator 51, a lower thrust collar 54, a lower thrust adjustment collar 53, a lower bearing seat 56, and a lower radial elastomeric 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 axial thrust sliding bearing stator 51 includes a lower axial thrust sliding bearing stator base 511 and a fourth axial sliding friction portion 512; the third radial sliding friction portion 432 and the fourth radial sliding friction portion 502 form a lower radial bearing sliding friction pair, and the third axial sliding friction portion 452 and the fourth axial sliding friction portion 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 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 first outer cylindrical surface 5017 of the lower radial sliding bearing stator is provided with a second multi-head spiral groove 5013, and the second outer cylindrical surface 5016 of the lower radial sliding bearing stator is provided with a second outer thread 5012; the lower bearing housing first inner cylindrical surface 568 is provided with a second single-start helical groove 565.

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

The lower thrust ring 54 is provided with a second inner conical surface 541, and the second inner conical surface 541 of the lower thrust ring 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 includes an upper hexagon socket head cap screw 210, and the lower stator assembly further includes a lower hexagon socket head cap screw 510; the second outer cylindrical surface first external thread 2012 of the upper radial sliding bearing stator is connected with the first inner cylindrical surface first internal thread 243 of the upper thrust ring, and the upper thrust ring 24 is connected with the upper axial thrust sliding bearing stator 21 through the upper inner hexagonal cylindrical head 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 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 ring, and the lower thrust ring 54 is connected with the lower axial thrust sliding bearing stator 51 through the lower internal hexagonal cylindrical head 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-handed threads; the second internal threads 543 and the second external threads 5012 are both left-handed threads.

The number of the first multi-head spiral grooves 2013 and the number of the first multi-head spiral ribs 283 are 6, the leads are 1000mm, the spiral directions are right-handed, and the first multi-head spiral grooves 2013 are matched with the first multi-head spiral ribs 283; the number of heads of the second multi-head spiral groove 5013 and the number of heads of the second multi-head spiral rib 583 are 6, the leads are 1000mm, the spiral directions are right-handed, 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-head spiral groove 265 and the number of turns of the first single-head spiral rib 282 are 2, the pitch is 30mm, the rotation directions are all right-handed, and the first single-head spiral groove 265 is matched with the first single-head spiral rib 282; the number of turns of the second single-end spiral grooves 565 and the number of turns of the second single-end spiral ribs 582 are 2, the pitch is 30mm, the rotation directions are all right-handed, and the second single-end spiral grooves 565 are paired with the second single-end spiral ribs 582.

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

The polycrystalline diamond friction part is a cylindrical flaky polycrystalline diamond friction part with a chamfer edge; the edge chamfer dimension of the edge chamfer cylindrical flaky polycrystalline diamond friction part is as follows: distance c=0.6 mm, angle α=45°.

The number of the first slotted cylindrical pin grooves 1316 and the second slotted cylindrical pin grooves 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 grooves 13111 is 12, the lead is 1000mm, and the rotation direction is right rotation; the number of the second multi-head spiral cooling grooves 43111 is 12, the lead is 1000mm, and the rotation direction is right-handed.

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 to distinguish between similar objects, and there is no order of preference between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

The foregoing embodiments in the present specification are all described in a progressive manner, and the same and similar parts of the embodiments are mutually referred to, and each embodiment is mainly described in a different manner from other embodiments.

The foregoing description of the embodiments of the present invention is merely illustrative, and the present invention is not limited to the embodiments described above. Any person skilled in the art can make any modification and variation in form and detail of the embodiments without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.

Claims

1. A dual acting slide bearing assembly comprising an upper slide bearing and a lower slide bearing, the upper slide bearing comprising an upper rotor assembly and an upper stator assembly, the lower slide bearing comprising a lower stator assembly and a lower rotor assembly, the upper rotor assembly comprising: an upper radial slide bearing rotor and an upper axial thrust slide 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;

The first inner cylindrical surface of the lower thrust ring is provided with a second inner thread; 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;

The upper stator assembly also comprises an upper cylindrical pin, an upper hexagon socket head cap screw and/or an upper positioning key; the lower stator assembly also comprises a lower cylindrical pin, a lower inner hexagonal cylindrical head screw or/and a lower positioning key;

The polycrystalline diamond friction part is a side chamfer cylindrical sheet-shaped polycrystalline diamond friction part or/and a side chamfer cylindrical sheet-shaped polycrystalline diamond friction part; the polycrystalline diamond and hard alloy composite friction part is a side chamfer cylindrical sheet polycrystalline diamond and hard alloy composite friction part or/and a side chamfer cylindrical sheet polycrystalline diamond and hard alloy composite friction part.

2. The dual acting journal bearing assembly as in claim 1 wherein the fourth outer cylindrical surface of the upper radial journal bearing stator and the first inner cylindrical surface of the upper axial thrust journal bearing stator are coupled together by the upper cylindrical pin, the first outer cylindrical surface first outer threads of the upper radial journal bearing stator and the first inner cylindrical surface first inner threads of the upper thrust collar first outer threads; or the third outer cylindrical surface second external thread of the upper radial sliding bearing stator is connected with the second inner cylindrical surface second internal thread of the upper axial thrust sliding bearing stator, or/and the upper axial thrust sliding bearing stator and the upper thrust ring are positioned by the upper positioning key; or the first external thread of the second external cylindrical surface of the upper radial sliding bearing stator is connected with the first internal thread of the first internal cylindrical surface of the upper thrust ring, and the upper thrust ring and the upper axial thrust sliding bearing stator are connected together through the upper internal hexagonal cylindrical head screw;

the upper radial sliding bearing stator and the upper bearing seat are connected together 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 screw thread of the second outer cylindrical surface of the lower radial sliding bearing stator is connected with the second inner screw thread of the first inner cylindrical surface of the lower thrust ring; or the third external thread of the third external cylindrical surface of the lower radial sliding bearing stator and the fourth internal thread of the second internal cylindrical surface of the lower axial thrust sliding bearing stator are connected together, or/and the lower axial thrust sliding bearing stator and the lower thrust ring are positioned by the lower positioning key; or the second external thread of the second external cylindrical surface of the lower radial sliding bearing stator is connected with the second internal thread of the first internal cylindrical surface of the lower thrust ring, and the lower thrust ring and the lower axial thrust sliding bearing stator are connected together through the lower internal hexagonal cylindrical head screw;

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

3. The dual acting slide bearing assembly of claim 1 wherein the first internal thread, the first external thread, the third internal thread, and the third external thread are all right-hand threads; the second internal thread, the second external thread, the fourth internal thread and the fourth external thread are left-handed threads;

The first radial sliding friction part is arranged between the first radial sliding friction part and the upper radial sliding bearing rotor friction part mounting hole, the second radial sliding friction part is arranged between the second radial sliding friction part and the upper radial sliding bearing stator friction part mounting hole, the third radial sliding friction part is arranged between the third radial sliding friction part and the lower radial sliding bearing rotor friction part mounting hole, the fourth radial sliding friction part is arranged between the fourth radial sliding friction part and the lower radial sliding bearing stator friction part mounting hole, the first axial sliding friction part is arranged between the first axial sliding friction part and the upper axial sliding bearing rotor friction part mounting hole, the second axial sliding friction part is arranged between the second axial sliding friction part and the upper axial sliding bearing stator friction part mounting hole, and the fourth axial sliding friction part is arranged between the third axial sliding friction part and the lower axial sliding bearing stator friction part mounting hole through solder and welding by adopting dipping brazing or flame brazing or induction brazing.

4. A dual-acting journal bearing assembly as in claim 1 wherein the upper and lower radial sleeves are each provided with 3-9 through holes in the axial direction; the upper radial elastic sleeve and the lower radial elastic sleeve are made of fluororubber or nitrile rubber, and the Shore hardness is 65-85; the inner cylindrical surface of the upper radial elastic sleeve is provided with a first multi-head spiral edge, and the inner cylindrical surface of the lower radial elastic sleeve is provided with a second multi-head spiral edge; 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.

5. A dual acting slide bearing assembly according to claim 4 wherein,

The number of the first multi-head spiral grooves and the number of the first multi-head spiral edges are 3-6, the leads are 1000mm, and the first multi-head spiral grooves are matched with the first multi-head spiral edges; the number of heads of the second multi-head spiral groove and the number of heads of the second multi-head spiral edge are 3-6, the lead is 1000mm, and the second multi-head spiral groove is matched with the second multi-head spiral edge; the number of turns of the first single-head spiral groove and the number of turns of the first single-head spiral edge are 2, the screw pitches are 25 mm-35 mm, and the first single-head spiral groove is matched with the first single-head spiral edge; the number of turns of the second single-head spiral groove and the number of turns of the second single-head spiral edge are 2, the screw pitches are 25 mm-35 mm, and the second single-head spiral groove is matched with the second single-head spiral edge.

6. A dual acting slide bearing assembly as defined in claim 1 wherein said upper housing external threads are right hand threads; the external thread of the lower bearing seat is a left-handed 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; the second inner conical surface of the lower thrust ring is contacted with the second outer conical surface of the lower bearing seat, or the second inner spherical surface of the lower thrust ring is contacted with the second outer spherical surface of the lower bearing seat.

7. The dual-acting slide bearing assembly of claim 1 wherein the side chamfer dimension of the side chamfer cylindrical polycrystalline diamond friction portion is: distance c=0.25 mm to 1.50mm, angle α=25 to 65 °, side rounding dimension of the side rounding cylindrical polycrystalline diamond friction portion: the radius r=0.25 mm-1.50 mm; the dimension of the edge chamfer cylindrical flaky polycrystalline diamond and hard alloy composite friction part is as follows: distance c=0.25 mm-1.50 mm, angle α=25° -65 °, and side rounding dimension of the side rounding cylindrical polycrystalline diamond and cemented carbide composite friction part: the radius r=0.25 mm-1.50 mm.

8. The biaxial acting sliding bearing assembly according to claim 1, wherein the number of the first, third and fifth saddle cylindrical pin grooves is 2 to 6, respectively, and the number of the second, fourth and sixth saddle cylindrical pin grooves is 2 to 6, respectively; the resistance of the polycrystalline diamond friction part and the resistance of the polycrystalline diamond and hard alloy composite friction part are all smaller than 380 ohms; the rotation direction of the drill bit is clockwise, the number of heads of the first multi-head spiral cooling groove is 3-12, the lead is 1000mm, and the rotation direction is right-handed; the number of the second multi-head spiral cooling grooves is 3-12, the lead is 1000mm, and the rotation direction is right-handed.