Economical brazing diamond single crystal bearing

Abstract

The utility model discloses an economical brazed diamond single crystal bearing, which belongs to the technical field of bearings, and comprises a movable ring and a static ring, and a plurality of sliding friction pairs are formed by sleeving or attaching the movable ring and the static ring to braze and fix diamond single crystal particles on a friction surface or by combining polycrystalline diamond compacts. The PDC bearing has the remarkable advantages of simplicity and convenience in process operation, controllable production cost and the like, and solves the problems of high cost and poor universality of the existing PDC bearing.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically to an economical brazed diamond single crystal bearing. Background Technology

[0002] Downhole drilling tools are core equipment in the oil and gas extraction field. Their performance directly affects drilling efficiency, trajectory control accuracy, and adaptability to complex formations, making them key technological equipment for the efficient development of deep oil and gas reservoirs and unconventional resources. Bearings, as an indispensable and crucial component of downhole power drilling tools, play a critical role in their lifespan.

[0003] Currently, diamond composite bearings (PDC bearings) are widely used in downhole power drilling tools such as turbine drills, screw drills, and rotary steerable drills. PDC materials possess advantages such as high hardness, high wear ratio, low coefficient of friction, and high thermal conductivity. However, due to the extreme physicochemical properties of diamond itself and the complex synthesis process of PDC, the production cost is high, which to some extent limits its application in high-end industries, especially in the oil and gas drilling and production field. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides an economical brazed diamond single crystal bearing.

[0005] This utility model discloses an economical brazed diamond single crystal bearing, including a dynamic ring and a stationary ring that cooperates with the dynamic ring. The dynamic ring is sleeved inside the stationary ring. The outer side of the dynamic ring and the inner side of the stationary ring are respectively fixed with a first diamond single crystal friction surface. The first diamond single crystal friction surfaces on both sides cooperate to form a first sliding friction pair.

[0006] Alternatively, the moving ring and the stationary ring are fitted together vertically, and the mating surfaces of the moving ring and the stationary ring are respectively fixed with a first diamond single crystal friction surface, and the first diamond single crystal friction surfaces on both sides cooperate to form a second sliding friction pair;

[0007] Alternatively, the moving ring is fitted inside the stationary ring, and at least one polycrystalline diamond composite sheet is fixed on the inner side of the stationary ring along its axial direction. A first diamond single crystal friction surface is fixed on the outer side of the moving ring, and the first diamond single crystal friction surface cooperates with all the polycrystalline diamond composite sheets to form a third sliding friction pair.

[0008] Alternatively, the moving ring is fitted inside the stationary ring, and at least one polycrystalline diamond composite sheet is fixed on the outer side of the moving ring along its axial direction. A first diamond single crystal friction surface is fixed on the inner side of the stationary ring, and the first diamond single crystal friction surface cooperates with all the polycrystalline diamond composite sheets to form a fourth sliding friction pair.

[0009] As a further improvement of this utility model, when the bearing has a third sliding friction pair, the moving ring is composed of a base and an annular base sleeved on one end of the base, the stationary ring is sleeved on the base, and the bottom surface of the stationary ring abuts against the top surface of the annular base.

[0010] The outer surface of the substrate is fixed with the first diamond single crystal friction surface, the top surface of the annular base is fixed with the second diamond single crystal friction surface, and the bottom surface of the stationary ring is also fixed with polycrystalline diamond composite sheets; the second diamond single crystal friction surface and all the polycrystalline diamond composite sheets cooperate to form a fifth sliding friction pair.

[0011] As a further improvement of this utility model, for the first and second sliding friction pairs, the first diamond single crystal friction surfaces on both sides are fixed to the moving ring and the stationary ring by brazing respectively;

[0012] For the third and fifth sliding friction pairs, the first diamond single crystal friction surface and the second diamond single crystal friction surface are fixed to the substrate and the annular base by brazing.

[0013] For the fourth sliding friction pair, the first diamond single crystal friction surface is fixed to the stationary ring by brazing.

[0014] As a further improvement of this utility model, for the first, second, third, fourth and fifth sliding friction pairs, the thickness of the first diamond single crystal friction surface and the second diamond single crystal friction surface is 0.1-0.5mm.

[0015] As a further improvement of this utility model, for the third and fifth sliding friction pairs, a plurality of first blind holes are arranged axially along the inner side of the stationary ring for at least one circle, and the plurality of first blind holes in each circle are spaced apart. A plurality of second blind holes are arranged circumferentially at intervals at the bottom of the stationary ring. The polycrystalline diamond composite sheet is welded into each first blind hole and each second blind hole, and the polycrystalline diamond composite sheet protrudes from the inner side of the stationary ring and the lower surface of the stationary ring.

[0016] As a further improvement of this utility model, for the fourth sliding friction pair, a plurality of third blind holes are arranged axially along the outer side of the moving ring for at least one circle, and the plurality of third blind holes in each circle are spaced apart. The polycrystalline diamond composite sheet is welded into each third blind hole, and the polycrystalline diamond composite sheet protrudes from the outer side of the moving ring.

[0017] As a further improvement of this utility model, the protrusion height of the polycrystalline diamond composite sheet is 0-3mm.

[0018] As a further improvement of this utility model, the polycrystalline diamond composite sheet includes a cylindrical shape and a cuboid shape.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] This invention simplifies the synthesis process and reduces costs from the source of material production by replacing all or part of the diamond composite sheet with brazed diamond single crystals. Simultaneously, the brazing method firmly fixes the diamond single crystal friction surface to components such as the moving ring and stationary ring, avoiding complex and expensive connection processes, further reducing overall production costs, and breaking the cost-limited application in high-end industries, especially in oil and gas drilling and production.

[0021] This utility model designs multiple ways of cooperating between the dynamic ring and the stationary ring, such as the dynamic ring being sleeved inside the stationary ring or being fitted together on both sides, and rationally distributes the diamond single crystal friction surface and polycrystalline diamond composite sheet to form a variety of sliding friction pairs. This allows the bearing to be flexibly selected according to different usage scenarios and working conditions, significantly improving its versatility and adaptability to complex working environments, and meeting the needs of downhole power drilling tools in various oil and gas extraction operations.

[0022] This invention fully utilizes the characteristics of diamond single crystal, such as high hardness, high wear ratio, low friction coefficient, and high thermal conductivity. Combined with a carefully designed sliding friction pair structure, it effectively reduces friction loss, significantly improves the wear resistance and service life of bearings, thereby enhancing the overall performance of downhole drilling tools, ensuring drilling efficiency and trajectory control accuracy, and strengthening the adaptability to complex formations. Attached Figure Description

[0023] Figure 1 This is the economical brazed diamond single crystal bearing disclosed in Embodiment 1 of this utility model;

[0024] Figure 2 This is the economical brazed diamond single crystal bearing disclosed in Embodiment 2 of this utility model;

[0025] Figure 3 This is the economical brazed diamond single crystal bearing disclosed in Embodiment 3 of this utility model;

[0026] Figure 4 This is the economical brazed diamond single crystal bearing disclosed in Embodiment 3 of this utility model.

[0027] In the picture:

[0028] 1. Moving ring; 1-1. Matrix; 1-2. Circular base; 2. Stationary ring; 3. First diamond single crystal friction surface; 4. Second diamond single crystal friction surface; 5. First blind hole; 6. Polycrystalline diamond composite sheet; 7. Second blind hole; 8. Third blind hole. Detailed Implementation

[0029] 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.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The present invention will now be described in further detail with reference to the accompanying drawings:

[0033] Example 1:

[0034] like Figure 1 As shown, this utility model provides an economical brazed diamond single crystal bearing, including a moving ring 1 and a stationary ring 2. Both the moving ring 1 and the stationary ring 2 are circular in shape. The moving ring 1 is fitted inside the stationary ring 2. First diamond single crystal friction surfaces 3 are fixed to the outer surface of the moving ring and the inner surface of the stationary ring, respectively. The first diamond single crystal friction surfaces 3 on both sides of the outer surface of the moving ring 1 and the inner surface of the stationary ring cooperate to form a first sliding friction pair. In this embodiment, the first diamond single crystal friction surfaces 3 on both sides are fixed to the moving ring 1 and the stationary ring 2 by brazing.

[0035] In this embodiment, preferably, the thickness of the first diamond single crystal friction surfaces 3 on both sides is 0.1-0.5 mm.

[0036] In this embodiment, preferably, the bearing composed of the moving ring 1 and the stationary ring 2 is a radial bearing.

[0037] This utility model provides an economical method for preparing a brazed diamond single crystal bearing, comprising:

[0038] The base blanks of the moving ring 1 and the stationary ring 2 are processed using 4140, 4145H, 17-4PH or 4330V materials to obtain the base blanks of the moving ring and the stationary ring.

[0039] Based on the moving ring substrate blank and the stationary ring substrate blank, abrasive adhesive is sprayed on the outer surface of the moving ring substrate blank and the inner surface of the stationary ring substrate blank, and then allowed to air dry naturally for 10-60 minutes. The adhesive is water-based or oil-based and includes one of epoxy resin adhesive, phenolic resin adhesive, polyurethane adhesive, screen printing adhesive, polyvinyl alcohol adhesive, and inorganic silicate adhesive.

[0040] 20-200 mesh diamond single crystal particles are evenly distributed onto the surface of the dynamic ring matrix blank and the stationary ring matrix blank coated with adhesive using a feeding machine. Silver-based active brazing filler metal, copper-based active brazing filler metal, nickel-based brazing filler metal or cobalt-based brazing filler metal are evenly coated or sprinkled onto the surface of the diamond single crystal and its pores. The steps of spraying adhesive and coating or sprinkling brazing filler metal are repeated.

[0041] After the diamond single crystal particles are laid, the dynamic ring matrix blank and the stationary ring matrix blank are placed in a vacuum brazing furnace and sintered at 500-900℃ for 10-90 minutes to finally obtain the dynamic ring and the stationary ring.

[0042] In this embodiment, preferably, if the gaps between the diamond single crystal particles on the bearing surface are too large, the gaps can be filled by spraying alloy powder with oxyacetylene before machining.

[0043] In this embodiment, preferably, the solders such as silver-based active solder, copper-based active solder, nickel-based solder, or cobalt-based solder are in paste or powder form.

[0044] Example 2:

[0045] like Figure 2 As shown, this utility model provides an economical brazed diamond single crystal bearing, including a moving ring 1 and a stationary ring 2. Both the moving ring 1 and the stationary ring 2 are circular in shape and are fitted together vertically. First diamond single crystal friction surfaces 3 are fixed to the mating surfaces of the moving ring 1 and the stationary ring 2, and the first diamond single crystal friction surfaces 3 on both sides cooperate to form a second sliding friction pair. In this embodiment, the first diamond single crystal friction surfaces 3 on both sides are fixed to the moving ring 1 and the stationary ring 2 by brazing.

[0046] In this embodiment, preferably, the thickness of the first diamond single crystal friction surfaces 3 on both sides is 0.1-0.5 mm.

[0047] In this embodiment, preferably, the bearing composed of the moving ring 1 and the stationary ring 2 is a thrust bearing.

[0048] This utility model provides an economical method for preparing a brazed diamond single crystal bearing, comprising:

[0049] The base blanks of the moving ring 1 and the stationary ring 2 are processed using 4140, 4145H, 17-4PH or 4330V materials to obtain the base blanks of the moving ring and the stationary ring.

[0050] Based on the moving ring substrate blank and the stationary ring substrate blank, abrasive adhesive is sprayed onto the mating surfaces of the moving ring substrate blank and the stationary ring substrate blank, and then allowed to air dry naturally for 10-60 minutes. The adhesive is water-based or oil-based and includes one of the following: epoxy resin adhesive, phenolic resin adhesive, polyurethane adhesive, screen printing adhesive, polyvinyl alcohol adhesive, and inorganic silicate adhesive.

[0051] 20-200 mesh diamond single crystal particles are evenly distributed onto the surface of the dynamic ring matrix blank and the stationary ring matrix blank coated with adhesive using a feeding machine. Silver-based active brazing filler metal, copper-based active brazing filler metal, nickel-based brazing filler metal or cobalt-based brazing filler metal are evenly coated or sprinkled onto the surface of the diamond single crystal and its pores. The steps of spraying adhesive and coating or sprinkling brazing filler metal are repeated.

[0052] After the diamond single crystal particles are laid, the dynamic ring matrix blank and the stationary ring matrix blank are placed in a vacuum brazing furnace and sintered at 500-900℃ for 10-90 minutes to finally obtain dynamic ring 1 and stationary ring 2.

[0053] In this embodiment, preferably, if the gaps between the diamond single crystal particles on the bearing surface are too large, the gaps can be filled by spraying alloy powder with oxyacetylene before machining.

[0054] In this embodiment, preferably, the solders such as silver-based active solder, copper-based active solder, nickel-based solder, or cobalt-based solder are in paste or powder form.

[0055] Example 3:

[0056] like Figure 3 As shown, this utility model provides an economical brazed diamond single crystal bearing, including a dynamic ring 1 and a stationary ring 2. The stationary ring 2 is generally circular, and at least one ring of polycrystalline diamond composite sheets 6 is arranged along its axial direction on the inner surface of the stationary ring 2. Each ring of polycrystalline diamond composite sheets 6 includes a plurality of polycrystalline diamond composite sheets 6 evenly spaced apart. A plurality of polycrystalline diamond composite sheets 6 are arranged in a ring at intervals on the bottom surface of the stationary ring 2.

[0057] In this embodiment, preferably, a plurality of first blind holes 5 are arranged axially along the inner side surface of the stationary ring 2 for at least one circle, and the plurality of first blind holes 5 in each circle are spaced apart. A plurality of second blind holes 7 are arranged in a ring at intervals at the bottom of the stationary ring 2. A polycrystalline diamond composite sheet 6 is welded into each first blind hole 5 and each second blind hole 7, and the polycrystalline diamond composite sheet 6 protrudes from the inner side surface and the lower surface of the stationary ring 2.

[0058] In this embodiment, preferably, the polycrystalline diamond composite sheet 6 has a shape that is either cylindrical or cuboid; when it is formed into a cylindrical shape, the polycrystalline diamond composite sheet 6 has a diameter of 2mm-20mm, a total height of 1mm-10mm, and an exposed height of 0-3mm.

[0059] In this embodiment, preferably, the polycrystalline diamond composite sheet 6 is welded and fixed to the corresponding first blind hole 5 and second blind hole 7; the welding method includes one of vacuum brazing, high frequency brazing, and flame brazing.

[0060] In this embodiment, preferably, the moving ring 1 includes a generally annular substrate 1-1 and an annular base 1-2, wherein the annular base 1-2 is sleeved on one end of the substrate 1-1. When the stationary ring 2 is sleeved on the moving ring 1 and the substrate 1-1, the bottom surface of the stationary ring 2 abuts against the top surface of the annular base 1-2. A first diamond single-crystal friction surface 3 is fixed on the outer surface of the substrate 1-1, and a second diamond single-crystal friction surface 4 is fixed on the top surface of the annular base 1-2. When the stationary ring 2 is sleeved on the moving ring 1, all the polycrystalline diamond composite sheets 6 located on the inner surface of the stationary ring 2 cooperate with the first diamond single-crystal friction surface 3 located on the outer surface of the substrate 1-1 to form a third sliding friction pair; all the polycrystalline diamond composite sheets 6 located on the bottom surface of the stationary ring 2 cooperate with the second diamond single-crystal friction surface 4 located on the top surface of the annular base 1-2 to form a fifth sliding friction pair.

[0061] In this embodiment, preferably, the first diamond single crystal friction surface 3 and the second diamond single crystal friction surface 4 are fixedly connected to the outer surface of the substrate 1-1 and the top surface of the annular base 1-2 by brazing.

[0062] In this embodiment, preferably, the thickness of the first diamond single crystal friction surfaces 3 on both sides is 0.1-0.5 mm.

[0063] In this embodiment, preferably, the bearing composed of the moving ring 1 and the stationary ring 2 is a combined bearing.

[0064] This utility model provides an economical method for preparing a brazed diamond single crystal bearing, comprising:

[0065] The base blanks of the moving ring 1 and the stationary ring 2 are processed using 4140, 4145H, 17-4PH or 4330V materials to obtain the base blanks of the moving ring and the stationary ring.

[0066] Based on the moving ring substrate blank and the stationary ring substrate blank, abrasive adhesive is sprayed on the outer side of the corresponding substrate 1-1 position of the moving ring substrate blank and the top surface of the corresponding annular base 1-2, and then naturally dried for 10-60 minutes; the adhesive is water-based or oil-based; it includes one of epoxy resin adhesive, phenolic resin adhesive, polyurethane type adhesive, screen printing adhesive, polyvinyl alcohol adhesive, and inorganic silicate adhesive; at least one ring of first blind holes 5 is arranged along its axial direction on the inner side of the stationary ring substrate blank, and a ring of second blind holes 7 is arranged in a ring on the bottom surface of the stationary ring substrate blank;

[0067] 20-200 mesh diamond single crystal particles are evenly distributed onto the surface of a dynamic ring substrate blank coated with adhesive using a feeding machine. Silver-based active brazing filler metal, copper-based active brazing filler metal, nickel-based brazing filler metal or cobalt-based brazing filler metal are evenly coated or sprinkled onto the surface and pores of the diamond single crystal. The steps of spraying adhesive and coating or sprinkling brazing filler metal are repeated.

[0068] Polycrystalline diamond composite sheet 6 is brazed and fixed in each first blind hole 5 and second blind hole 7, ensuring that the polycrystalline diamond composite sheet 6 protrudes from the inner side of the stationary ring substrate blank and the bottom surface of the stationary ring substrate blank.

[0069] After the diamond single crystal particles and polycrystalline diamond composite sheet 6 are laid out, the dynamic ring matrix blank and the stationary ring matrix blank are placed in a vacuum brazing furnace and sintered at 500-900℃ for 10-90 minutes to finally obtain the dynamic ring 1 and the stationary ring 2.

[0070] In this embodiment, preferably, if the gaps between the diamond single crystal particles on the bearing surface are too large, the gaps can be filled by spraying alloy powder with oxyacetylene before machining.

[0071] In this embodiment, preferably, the solders such as silver-based active solder, copper-based active solder, nickel-based solder, or cobalt-based solder are in paste or powder form.

[0072] Example 4:

[0073] like Figure 4 As shown, this utility model provides an economical brazed diamond single crystal bearing, including a moving ring 1 and a stationary ring 2. Both the moving ring 1 and the stationary ring 2 are annular in shape. The moving ring 1 is fitted inside the stationary ring 2. At least one ring of polycrystalline diamond composite sheet 6 is fixed along the axial direction on the outer surface of the moving ring 1. Each ring of polycrystalline diamond composite sheet 6 includes several polycrystalline diamond composite sheets 6 spaced apart.

[0074] In this embodiment, preferably, a plurality of third blind holes 8 are arranged axially along the outer side of the moving ring 1 for at least one circle, and the plurality of third blind holes 8 in each circle are spaced apart. The plurality of third blind holes 8 are arranged circumferentially on the outer side of the moving ring 1 at intervals. A polycrystalline diamond composite sheet 6 is welded into each third blind hole 8, and the polycrystalline diamond composite sheet 6 protrudes from the outer side of the moving ring 1.

[0075] In this embodiment, preferably, the polycrystalline diamond composite sheet 6 has a shape that is either cylindrical or cuboid; when it is formed into a cylindrical shape, the polycrystalline diamond composite sheet 6 has a diameter of 2mm-20mm, a total height of 1mm-10mm, and an exposed height of 0-3mm.

[0076] In this embodiment, preferably, the polycrystalline diamond composite sheets 6 are all welded and fixed in the corresponding third blind holes 8; the welding method includes one of vacuum brazing, high-frequency brazing, and flame brazing.

[0077] In this embodiment, preferably, a first diamond single-crystal friction surface 3 is fixed to the inner surface of the stationary ring 2, and the first diamond single-crystal friction surface 3 is fixed to the inner surface of the stationary ring 2 by brazing. The thickness of the first diamond single-crystal friction surface 3 is 0.1-0.5 mm.

[0078] In this embodiment, the bearing composed of the moving ring 1 and the stationary ring 2 is a radial bearing.

[0079] This utility model provides an economical method for preparing a brazed diamond single crystal bearing, comprising:

[0080] The base blanks of the moving ring 1 and the stationary ring 2 are processed using 4140, 4145H, 17-4PH or 4330V materials to obtain the base blanks of the moving ring and the stationary ring.

[0081] Based on the moving ring substrate blank and the stationary ring substrate blank, an abrasive adhesive is sprayed onto the inner surface of the stationary ring substrate blank and allowed to air dry naturally for 10-60 minutes; the adhesive is water-based or oil-based; it includes one of epoxy resin adhesive, phenolic resin adhesive, polyurethane type adhesive, screen printing adhesive, polyvinyl alcohol adhesive, and inorganic silicate adhesive; at least one ring of third blind holes 8 is arranged along its axial direction on the outer surface of the moving ring substrate blank;

[0082] 20-200 mesh diamond single crystal particles are evenly distributed onto the inner surface of a static ring matrix blank coated with adhesive using a feeding machine. Silver-based active brazing filler metal, copper-based active brazing filler metal, nickel-based brazing filler metal, or cobalt-based brazing filler metal are evenly coated or sprinkled onto the surface and pores of the diamond single crystal. The steps of spraying adhesive and coating or sprinkling brazing filler metal are repeated.

[0083] Polycrystalline diamond composite sheet 6 is brazed and fixed in each third blind hole 8, ensuring that the polycrystalline diamond composite sheet 6 protrudes from the outer side of the moving ring substrate blank.

[0084] After the diamond single crystal particles and polycrystalline diamond composite sheet 6 are laid out, the dynamic ring matrix blank and the stationary ring matrix blank are placed in a vacuum brazing furnace and sintered at 500-900℃ for 10-90 minutes to finally obtain the dynamic ring 1 and the stationary ring 2.

[0085] In the above embodiments, preferably, if the gaps between the diamond single crystal particles on the bearing surface are too large, the gaps can be filled by oxyacetylene spraying alloy powder, and then machining can be performed.

[0086] In the above embodiments, preferably, the solders such as silver-based active solder, copper-based active solder, nickel-based solder, or cobalt-based solder are in paste or powder form.

[0087] In the schemes of Examples 3 and 4, the moving ring 1 and the stationary ring 2 adopt a combination structure of brazed diamond single crystal friction surface and polycrystalline diamond composite sheet, forming a gradient wear mechanism, which has the following advantages:

[0088] 1. Preferred wear protection: Since the friction surface of diamond single crystal will wear first, it will be damaged before the polycrystalline diamond composite sheet fails, thus avoiding direct failure of the bearing;

[0089] 2. Low-cost maintenance: In actual replacement, only the dynamic ring or stationary ring with the brazed diamond single crystal friction surface needs to be replaced, which is far less expensive than replacing the entire bearing assembly.

[0090] 3. Downstream equipment protection: Damage to the dynamic or static ring of the brazed diamond single crystal friction surface will not affect downstream equipment, but damage to the dynamic or static ring of the brazed polycrystalline diamond composite sheet will cause collateral damage to downstream equipment.

[0091] Advantages of this utility model:

[0092] This invention simplifies the synthesis process and reduces costs from the source of material production by replacing all or part of the diamond composite sheet with brazed diamond single crystals. Simultaneously, the brazing method firmly fixes the diamond single crystal friction surface to components such as the moving ring 1 and stationary ring 2, avoiding complex and expensive connection processes, further reducing overall production costs, and breaking the cost-limited application in high-end industries, especially in oil and gas drilling and production.

[0093] This utility model designs multiple ways of cooperating between the dynamic ring 1 and the stationary ring 2, such as the dynamic ring 1 being fitted inside the stationary ring 2 or being attached to each other on both sides. It also rationally distributes the diamond single crystal friction surface and the polycrystalline diamond composite sheet 6 to form a variety of sliding friction pairs. This allows the bearing to be flexibly selected according to different usage scenarios and working conditions, significantly improving its versatility and adaptability to complex working environments, and meeting the needs of downhole power drilling tools in various oil and gas extraction operations.

[0094] This invention fully utilizes the characteristics of diamond single crystal, such as high hardness, high wear ratio, low friction coefficient, and high thermal conductivity. Combined with a carefully designed sliding friction pair structure, it effectively reduces friction loss, significantly improves the wear resistance and service life of bearings, thereby enhancing the overall performance of downhole drilling tools, ensuring drilling efficiency and trajectory control accuracy, and strengthening the adaptability to complex formations.

[0095] This invention features a simple process that enables the high-performance fabrication of bearings under normal pressure. Compared to traditional high-temperature, high-pressure methods for synthesizing diamond composite sheets, it significantly reduces energy consumption and equipment investment and production costs.

[0096] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An economical brazed diamond single crystal bearing, comprising a rotating ring and a stationary ring mating with the rotating ring, characterized in that, The moving ring is sleeved inside the stationary ring. The outer side of the moving ring and the inner side of the stationary ring are respectively fixed with a first diamond single crystal friction surface. The first diamond single crystal friction surfaces on both sides cooperate to form a first sliding friction pair. Alternatively, the moving ring and the stationary ring are fitted together vertically, and the mating surfaces of the moving ring and the stationary ring are respectively fixed with a first diamond single crystal friction surface, and the first diamond single crystal friction surfaces on both sides cooperate to form a second sliding friction pair; Alternatively, the moving ring is fitted inside the stationary ring, and at least one polycrystalline diamond composite sheet is fixed on the inner side of the stationary ring along its axial direction. A first diamond single crystal friction surface is fixed on the outer side of the moving ring, and the first diamond single crystal friction surface cooperates with all the polycrystalline diamond composite sheets to form a third sliding friction pair. Alternatively, the moving ring is fitted inside the stationary ring, and at least one polycrystalline diamond composite sheet is fixed on the outer side of the moving ring along its axial direction. A first diamond single crystal friction surface is fixed on the inner side of the stationary ring, and the first diamond single crystal friction surface cooperates with all the polycrystalline diamond composite sheets to form a fourth sliding friction pair.

2. The economical brazed diamond single crystal bearing according to claim 1, characterized in that, When the bearing has a third sliding friction pair, the moving ring is composed of a base and an annular base sleeved on one end of the base, the stationary ring is sleeved on the base, and the bottom surface of the stationary ring abuts against the top surface of the annular base. The outer surface of the substrate is fixed with the first diamond single crystal friction surface, the top surface of the annular base is fixed with the second diamond single crystal friction surface, and the bottom surface of the stationary ring is also fixed with polycrystalline diamond composite sheets; the second diamond single crystal friction surface and all the polycrystalline diamond composite sheets cooperate to form a fifth sliding friction pair.

3. The economical brazed diamond single crystal bearing according to claim 2, characterized in that, For the first and second sliding friction pairs, the first diamond single crystal friction surfaces on both sides are fixed to the moving ring and the stationary ring by brazing, respectively. For the third and fifth sliding friction pairs, the first diamond single crystal friction surface and the second diamond single crystal friction surface are fixed to the substrate and the annular base by brazing. For the fourth sliding friction pair, the first diamond single crystal friction surface is fixed to the stationary ring by brazing.

4. The economical brazed diamond single crystal bearing according to claim 2, characterized in that, For the first, second, third, fourth and fifth sliding friction pairs, the thickness of the first diamond single crystal friction surface and the second diamond single crystal friction surface is 0.1-0.5 mm.

5. The economical brazed diamond single crystal bearing according to claim 2, characterized in that, For the third and fifth sliding friction pairs, multiple first blind holes are arranged axially along the inner side of the stationary ring for at least one circle, and the multiple first blind holes in each circle are spaced apart. Multiple second blind holes are arranged circumferentially at intervals at the bottom of the stationary ring. The polycrystalline diamond composite sheet is welded into each first blind hole and each second blind hole, and the polycrystalline diamond composite sheet protrudes from the inner side of the stationary ring and the lower surface of the stationary ring.

6. The economical brazed diamond single crystal bearing according to claim 1, characterized in that, For the fourth sliding friction pair, multiple third blind holes are arranged axially along the outer surface of the moving ring for at least one circle, and the multiple third blind holes in each circle are spaced apart. Each third blind hole is welded with the polycrystalline diamond composite sheet, and the polycrystalline diamond composite sheet protrudes from the outer surface of the moving ring.

7. The economical brazed diamond single crystal bearing according to claim 5 or 6, characterized in that, The protrusion height of the polycrystalline diamond composite sheet is 0-3mm.

8. The economical brazed diamond single crystal bearing according to claim 5 or 6, characterized in that, The polycrystalline diamond composite sheet can be either cylindrical or cuboid in shape.

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