Sliding bearing

Abstract

The utility model discloses a sliding bearing which comprises a static ring and a moving ring, and the static ring is sleeved on the moving ring. At least one circle of multiple first blind holes are formed in the circumferential direction of the first inner cylindrical surface of the static ring, and a first friction part is fixed in each first blind hole; at least one circle of a plurality of second blind holes are formed in the circumferential direction of the second outer cylindrical surface of the movable ring; a second friction part is fixed in each second blind hole; all the first friction parts and the second friction parts are correspondingly arranged to form a sliding friction pair; wherein the first friction part and the second friction part are a TSP friction part, a PCD friction part, a nickel-plated TSP friction part, a nickel-plated PCD friction part, a coated TSP friction part or a coated PCD friction part. Through the application of TSP and PCD materials, the wear resistance and stability of the sliding bearing are remarkably improved, and the service life of the sliding bearing under the severe working conditions of high speed, heavy load, high temperature and the like is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing technical field, concretely relates to a sliding bearing. BACKGROUND

[0002] With the petroleum and natural gas exploitation increasing strength day by day, rotary steering drilling tool has been widely applied in the drilling operation of complex structure well such as horizontal well, large displacement well and multi-lateral well, provides strong technical support for improving oil and gas field development efficiency and recovery ratio, however, the downhole harsh environment brings great challenge to drilling work. Due to the restriction of downhole space, as the key component of rotary steering system, bearing usually adopts open structure, which is directly exposed to drilling fluid full of solid particles, causing serious wear of bearing. In addition, the direct contact of bearing and corrosive strata such as salt formation, high-sulfur formation, high-carbon dioxide layer, organic acid rock layer and porous sandstone layer puts forward higher requirements on the corrosion resistance of bearing friction pair materials.

[0003] Polycrystalline diamond compact (PDC) has high hardness and high wear resistance of diamond, and high impact resistance of hard alloy, and is the commonly used material of sliding bearing friction pair at present. However, the corrosion resistance of polycrystalline diamond compact is relatively limited, especially the hard alloy part and cobalt binder are easy to be oxidized and corroded, causing corrosion failure of bearing. In addition, the preparation process of high wear resistance PDC is relatively complicated, and the optimization design of multi-layer composite material puts forward extremely high requirements on equipment precision, process parameter control and material performance matching, and the preparation of high wear resistance PDC material usually needs to invest high cost, which further restricts the development of PDC bearing. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the prior art, the utility model provides a sliding bearing, which adopts thermally stable polycrystalline (TSP) and / or diamond polycrystalline (PCD) as the sliding friction pair of the sliding bearing.

[0005] The utility model discloses a sliding bearing, which comprises a static ring and a dynamic ring, the static ring is sleeved on the dynamic ring,

[0006] The static ring comprises a first base body in the shape of a whole ring, the first base body has opposite first inner cylindrical surfaces and first outer cylindrical surfaces, the first inner cylindrical surfaces are provided with a plurality of first blind holes, the plurality of first blind holes are arranged at least one circle along the circumference of the first base body, and the plurality of first blind holes in each circle are arranged at intervals; a first friction part is fixed in each first blind hole, and one side of the first friction part exposes the first inner cylindrical surface;

[0007] The moving ring comprises a second base body in the shape of a whole ring, the second base body has opposite second inner and outer cylindrical surfaces, the second outer cylindrical surface is provided with a plurality of second blind holes, the plurality of second blind holes are arranged in at least one circle along the circumference of the second base body, and the plurality of second blind holes in each circle are arranged at intervals, and a second friction part is fixed in each second blind hole, and one side of the second friction part exposes the second outer cylindrical surface;

[0008] All the first friction parts and all the second friction parts are correspondingly arranged to form a sliding friction pair, wherein the corresponding first friction part and second friction part are a thermally stable polycrystalline diamond friction part (TSP friction part), a polycrystalline diamond friction part (PCD friction part), a nickel-plated thermally stable polycrystalline diamond friction part (nickel-plated TSP friction part), a nickel-plated polycrystalline diamond friction part (nickel-plated PCD friction part), a cladded thermally stable polycrystalline diamond friction part (cladded TSP friction part), or a cladded polycrystalline diamond friction part (cladded PCD friction part).

[0009] As a further improvement of the utility model, the moving ring comprises a first base in the shape of a whole ring, the first base is sleeved on one end of the second base body, and when the static ring is sleeved on the moving ring, the bottom surface of the first base body abuts against the top surface of the first base;

[0010] The bottom surface of the first base body is provided with a plurality of third blind holes, the plurality of third blind holes are arranged in at least one circle along the circumference of the first base body, and the plurality of third blind holes in each circle are arranged at intervals, and a third friction part is fixed in each third blind hole, and one side of the third friction part exposes the bottom surface of the first base body;

[0011] The top surface of the first base is provided with a plurality of fourth blind holes, the plurality of fourth blind holes are arranged in at least one circle along the circumference of the first base, and the plurality of fourth blind holes in each circle are arranged at intervals, and a fourth friction part is fixed in each fourth blind hole, and one side of the fourth friction part exposes the top surface of the first base;

[0012] All the third friction parts and all the fourth friction parts are correspondingly arranged to form a sliding friction pair, wherein the corresponding third friction part and fourth friction part are a thermally stable polycrystalline diamond friction part (TSP friction part), a polycrystalline diamond friction part (PCD friction part), a nickel-plated thermally stable polycrystalline diamond friction part (nickel-plated TSP friction part), a nickel-plated polycrystalline diamond friction part (nickel-plated PCD friction part), a cladded thermally stable polycrystalline diamond friction part (cladded TSP friction part), or a cladded polycrystalline diamond friction part (cladded PCD friction part).

[0013] As a further improvement of the utility model, the material of the first friction part and the second friction part is consistent.

[0014] As a further improvement of the utility model, the thermal stable polycrystal diamond friction part is silicon-based polycrystal, and the polycrystal diamond friction part is cobalt-based polycrystal.

[0015] As a further improvement of the utility model, the axial spacing of the first friction part of two adjacent circles is the same as the axial spacing of the second friction part of two adjacent circles, and the axial spacing of the third friction part of two adjacent circles is the same as the axial spacing of the fourth friction part of two adjacent circles.

[0016] As a further improvement of the utility model,

[0017] The difference between the static ring first friction part and the dynamic ring second friction part is 10um-50um.

[0018] The shape of the first friction part, the second friction part, the third friction part or the fourth friction part includes one of a cylindrical shape and a square shape, when the cylindrical shape is formed, the diameter of the first friction part, the second friction part, the third friction part or the fourth friction part is 2mm-20mm, the total height is 1mm-10mm, and the exposed height is 0-3mm.

[0019] As a further improvement of the utility model,

[0020] The nickel-plated thermal stable polycrystal diamond friction part (nickel-plated TSP friction part) or the nickel-plated polycrystal diamond friction part (nickel-plated PCD friction part) comprises a thermal stable polycrystal diamond friction part or a polycrystal diamond friction part, and a nickel-plated layer formed on the outside thereof; wherein the thickness of the nickel-plated layer is 0.05mm-0.30mm.

[0021] The nickel-plated thermal stable polycrystal diamond friction part (nickel-plated TSP friction part) or the nickel-plated polycrystal diamond friction part (nickel-plated PCD friction part) comprises a thermal stable polycrystal diamond friction part or a polycrystal diamond friction part, and a nickel-plated layer formed on the outside thereof; wherein the thickness of the nickel-plated layer is 0.05mm-0.30mm.

[0022] As a further improvement of the utility model, the first friction part, the second friction part, the third friction part or the fourth friction part is welded and fixed in the corresponding first blind hole, second blind hole, third blind hole or fourth blind hole; wherein the welding mode includes one of vacuum brazing, high-frequency brazing and flame spray welding.

[0023] Compared with the prior art, the utility model has the beneficial effects that:

[0024] This invention significantly improves the wear resistance of sliding bearings by using TSP and PCD materials, greatly extending their service life under harsh conditions such as high speed, heavy load, and high temperature. At the same time, the thermal stability of TSP enables sliding bearings to maintain good operating conditions in high-temperature environments, thus broadening the application range of sliding bearings.

[0025] The nickel plating treatment of this invention enhances the corrosion resistance of the material, and the encapsulation treatment allows TSP and PCD to better integrate with other materials, thereby improving the structural stability of the sliding bearing. Attached Figure Description

[0026] Figure 1 This is an exploded view of the sliding bearing disclosed in Embodiment 1 of this utility model;

[0027] Figure 2 This is an exploded view of the sliding bearing disclosed in Embodiment 2 of this utility model;

[0028] Figure 3 This is an exploded view of the sliding bearing disclosed in Embodiment 3 of this utility model.

[0029] In the picture:

[0030] 10. Stationary ring; 11. First substrate; 12. First blind hole; 13. Third blind hole; 14. First friction part; 15. Third friction part;

[0031] 20. Moving ring; 21. Second base; 22. First base; 23. Second blind hole; 24. Fourth blind hole; 25. Second friction part; 26. Fourth friction part;

[0032] 30. Waterway. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] The present invention will now be described in further detail with reference to the accompanying drawings:

[0035] Example 1:

[0036] like Figure 1 As shown, this utility model provides a sliding bearing, including: a stationary ring 10 and a rotating ring 20, wherein the stationary ring 10 is sleeved on the rotating ring 20; wherein,

[0037] The static ring 10 comprises a first base body 11 in the shape of a whole ring, the first base body 11 has opposite first inner and outer cylindrical surfaces, the first inner cylindrical surface is provided with a plurality of first blind holes 12, the plurality of first blind holes 12 are arranged in three circles along the circumference of the first base body, and the plurality of first blind holes 12 in each circle are arranged at intervals, and the blind holes 12 are in the shape of a cylinder; a first friction part 14 is fixed in each first blind hole 12, and one side of the first friction part 14 is exposed to the first inner cylindrical surface.

[0038] The dynamic ring 20 comprises a second base body 21 in the shape of a whole ring and a first base 22, the second base body 21 has opposite second inner and outer cylindrical surfaces, the second outer cylindrical surface is provided with a plurality of second blind holes 23, the plurality of second blind holes 23 are arranged in three circles along the circumference of the second base body, and the plurality of second blind holes 23 in each circle are arranged at intervals, and a second friction part 25 is fixed in each second blind hole 23, and one side of the second friction part 25 is exposed to the second outer cylindrical surface.

[0039] The first base 22 is sleeved on one end of the second base body 21, when the static ring 10 is sleeved on the dynamic ring 20, the bottom surface of the first base body 11 abuts against the top surface of the first base 22; the bottom surface of the first base body 11 is provided with a plurality of third blind holes 13, the plurality of third blind holes 13 are arranged in a circle along the circumference of the first base body, and the plurality of third blind holes 13 in each circle are uniformly arranged at intervals; a third friction part 15 is fixed in each third blind hole 13, and one side of the third friction part 15 is exposed to the bottom surface of the first base body 11; the top surface of the first base 22 is provided with a plurality of fourth blind holes 24, the plurality of fourth blind holes 24 are arranged in a circle along the circumference of the first base 22, and the plurality of fourth blind holes 24 in each circle are uniformly arranged at intervals; a fourth friction part 26 is fixed in each fourth blind hole 24, and one side of the fourth friction part 26 is exposed to the top surface of the first base 22.

[0040] All the first friction parts 14 and all the second friction parts 25 are correspondingly arranged to form a sliding friction pair; all the third friction parts 15 and all the fourth friction parts 26 are correspondingly arranged to form a sliding friction pair; wherein, the corresponding first friction part 14 and the second friction part 25 are TSP friction parts, PCD friction parts, nickel-plated TSP friction parts, nickel-plated PCD friction parts, inlaid TSP friction parts or inlaid PCD friction parts; the corresponding third friction part 15 and the fourth friction part 26 are TSP friction parts, PCD friction parts, nickel-plated TSP friction parts, nickel-plated PCD friction parts, inlaid TSP friction parts or inlaid PCD friction parts; preferably, the corresponding first friction part 14 and the second friction part 25, and the corresponding third friction part 15 and the fourth friction part 26 are nickel-plated TSP friction parts, nickel-plated PCD friction parts, inlaid TSP friction parts or inlaid PCD friction parts.

[0041] Further, the materials of the corresponding first friction part 14 and the second friction part 25, the corresponding third friction part 15 and the fourth friction part 26 are consistent; that is, all are nickel-plated TSP friction parts, all are nickel-plated PCD friction parts, all are inlaid TSP friction parts, or all are inlaid PCD friction parts; different nickel-plated TSP friction parts, nickel-plated PCD friction parts, inlaid TSP friction parts and inlaid PCD friction parts can also be combined on different circles of the same static ring and dynamic ring, or different nickel-plated TSP friction parts, nickel-plated PCD friction parts, inlaid TSP friction parts and inlaid PCD friction parts can also be combined on the same circle of the same static ring and dynamic ring.

[0042] Further, the heat-stable polycrystal diamond friction part is silicon-based polycrystal, and the polycrystal diamond friction part is cobalt-based polycrystal. The axial spacing of the first friction part of the adjacent two circles is the same as the axial spacing of the second friction part of the adjacent two circles, and the axial spacing of the third friction part of the adjacent two circles is the same as the axial spacing of the fourth friction part of the adjacent two circles.

[0043] Further, the difference between the first friction part of the static ring and the second friction part of the dynamic ring is 10-50 μm; the shape of the first friction part, the second friction part, the third friction part or the fourth friction part includes one of a cylindrical shape and a square shape, when the cylindrical shape is formed, the diameter of the first friction part, the second friction part, the third friction part or the fourth friction part is 2-20 mm, the total height is 1-10 mm, and the exposed height is 0-3 mm.

[0044] Further, the nickel-plated TSP friction part or the nickel-plated PCD friction part comprises a TSP friction part or a PCD friction part and a nickel-plated layer formed on the outside thereof; wherein the thickness of the nickel-plated layer is 0.05-0.30 mm; the inlaid TSP friction part or the inlaid PCD friction part comprises a TSP friction part or a PCD friction part and a metal inlaid layer formed on the outside thereof; wherein the thickness of the metal inlaid layer is 0.50-5 mm.

[0045] Further, the first friction part, the second friction part, the third friction part or the fourth friction part is welded and fixed in the corresponding first blind hole, the second blind hole, the third blind hole or the fourth blind hole; wherein the welding mode comprises one of vacuum brazing, high-frequency brazing and flame spray welding.

[0046] The utility model provides a kind of preparation method of sliding bearing, comprising:

[0047] S1, TSP and PCD are synthesized under high temperature and high pressure using a cubic press;

[0048] S2, nickel is plated to TSP and PCD, and nickel-plated TSP and nickel-plated PCD are prepared;

[0049] S3, bonding the TSP or PCD to the lower press head of the graphite mold, and assembling it with the middle mold of the graphite mold; filling the metal powder (WC, Ni powder, etc.) in the gap between the TSP or PCD and the middle mold, after filling, installing the upper press head, and sintering at 800-1200 DEG C for 1-30 min in the hot-pressing sintering machine, and taking out the synthesized sample after cooling, to obtain the inlaid TSP or inlaid PCD;

[0050] S4, machining the TSP, PCD, nickel-plated TSP, nickel-plated PCD, inlaid TSP and inlaid PCD to obtain the TSP friction part, PCD friction part, nickel-plated TSP friction part, nickel-plated PCD friction part, inlaid TSP friction part or inlaid PCD friction part of the required size;

[0051] S5, punching and processing the base of the static ring and the dynamic ring, and welding and fixing the TSP friction part, PCD friction part, nickel-plated TSP friction part, nickel-plated PCD friction part, inlaid TSP friction part or inlaid PCD friction part in the corresponding blind hole, to form the final sliding bearing.

[0052] Embodiment 2:

[0053] As shown in Figure 2 The utility model provides a kind of sliding bearing, unlike embodiment 1, the first base body 11 of static ring 10 can be split structure.

[0054] Embodiment 3:

[0055] As shown in Figure 3 The utility model provides a kind of sliding bearing, unlike embodiment 1, the blind hole on the first base body 11 of static ring 10 and the second base body 21 of dynamic ring 20 is square hole, corresponding friction part shape is square shape;Meanwhile, water channel 30 for facilitating lubricating oil to flow can also be opened in static ring 10 and dynamic ring 20.

[0056] The utility model has the advantages that:

[0057] The utility model improves the wear resistance of sliding bearing by the application of TSP and PCD material, so that the service life of sliding bearing is greatly extended under high speed, heavy load and other harsh conditions;At the same time, TSP removes metal binder, reduces internal stress caused by metal expansion at high temperature, so it is more stable at high temperature and less likely to delaminate or fail, so that sliding bearing can maintain good operating condition at high temperature, and the application range of sliding bearing is widened.

[0058] The nickel plating treatment of the utility model enhances the corrosion resistance of material, and the inlaid treatment makes TSP and PCD better combined with other materials, improving the structural stability of sliding bearing.

[0059] The above merely is preferred embodiment of the present utility model, and is not used to limit the present utility model, for the person skilled in the art, the present utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the present utility model should be contained in the protection scope of the present utility model.

Claims

1. A plain bearing, characterized in that The static ring and the dynamic ring, the static ring is sleeved on the dynamic ring; The static ring includes a first base body in the shape of a whole ring, the first base body has opposite first inner cylindrical surface and first outer cylindrical surface, the first inner cylindrical surface is provided with a plurality of first blind holes, a plurality of first blind holes are arranged at least one circle along the circumference of the first base body and a plurality of first blind holes in each circle are arranged at intervals; Each of the first blind hole is fixed with a first friction part, one side of the first friction part exposes the first inner cylindrical surface; The dynamic ring includes a second base body in the shape of a whole ring, the second base body has opposite second inner cylindrical surface and second outer cylindrical surface, the second outer cylindrical surface is provided with a plurality of second blind holes, a plurality of second blind holes are arranged at least one circle along the circumference of the second base body and a plurality of second blind holes in each circle are arranged at intervals, each of the second blind hole is fixed with a second friction part, one side of the second friction part exposes the second outer cylindrical surface; All the first friction parts and all the second friction parts are correspondingly arranged to form a sliding friction pair; wherein, the corresponding first friction part and second friction part are thermal stable polycrystalline diamond friction part, polycrystalline diamond friction part, nickel plated thermal stable polycrystalline diamond friction part, nickel plated polycrystalline diamond friction part, inlaid thermal stable polycrystalline diamond friction part or inlaid polycrystalline diamond friction part. The dynamic ring includes a first base in the shape of a whole ring, the first base is sleeved on one end of the second base body, when the static ring is sleeved on the dynamic ring, the bottom surface of the first base body abuts against the top surface of the first base; 2. The plain bearing according to claim 1, characterized in that The bottom surface of the first base body is provided with a plurality of third blind holes, a plurality of third blind holes are arranged at least one circle along the circumference of the first base body and a plurality of third blind holes in each circle are arranged at intervals; Each of the third blind hole is fixed with a third friction part, one side of the third friction part exposes the bottom surface of the first base body; The top surface of the first base is provided with a plurality of fourth blind holes, a plurality of fourth blind holes are arranged at least one circle along the circumference of the first base and a plurality of fourth blind holes in each circle are arranged at intervals; Each of the fourth blind hole is fixed with a fourth friction part, one side of the fourth friction part exposes the top surface of the first base; All the third friction parts and all the fourth friction parts are correspondingly arranged to form a sliding friction pair; wherein, the corresponding third friction part and fourth friction part are thermal stable polycrystalline diamond friction part, polycrystalline diamond friction part, nickel plated thermal stable polycrystalline diamond friction part, nickel plated polycrystalline diamond friction part, inlaid thermal stable polycrystalline diamond friction part or inlaid polycrystalline diamond friction part. The materials of the corresponding first friction part and second friction part are consistent, and the materials of the corresponding third friction part and fourth friction part are consistent.

3. The plain bearing as claimed in claim 2, characterized in that The thermal stable polycrystalline diamond friction part is silicon-based polycrystal, and the polycrystalline diamond friction part is cobalt-based polycrystal.

4. The plain bearing according to any one of claims 1 to 3, characterized in that 5. The sliding bearing according to any one of claims 1 to 3, wherein The difference between the static ring first friction part and the dynamic ring second friction part is 10 μm to 50 μm; ​ The shape of the first friction part, the second friction part, the third friction part or the fourth friction part includes one of a cylindrical shape and a square shape. When the shape is a cylindrical shape, the diameter of the first friction part, the second friction part, the third friction part or the fourth friction part is 2 mm to 20 mm, the total height is 1 mm to 10 mm, and the exposed height is 0 to 3 mm.

6. The plain bearing according to claim 5, characterized in that The nickel-plated thermally stable polycrystalline diamond friction part or the nickel-plated polycrystalline diamond friction part includes a thermally stable polycrystalline diamond friction part or a polycrystalline diamond friction part, and a nickel-plated layer formed on the outside thereof; wherein the thickness of the nickel-plated layer is 0.05 mm to 0.30 mm. The nickel-plated thermally stable polycrystalline diamond friction part or the nickel-plated polycrystalline diamond friction part includes a thermally stable polycrystalline diamond friction part or a polycrystalline diamond friction part, and a nickel-plated layer formed on the outside thereof; wherein the thickness of the nickel-plated layer is 0.05 mm to 0.30 mm.

7. The plain bearing according to any one of claims 1 to 3, characterized in that The first friction part, the second friction part, the third friction part or the fourth friction part is welded and fixed in the corresponding first blind hole, the second blind hole, the third blind hole or the fourth blind hole; wherein the welding method includes one of vacuum brazing, high-frequency brazing and flame spray welding.

Images