A gap sealing type oil distribution sleeve

Abstract

The utility model belongs to the field of oil distribution sleeve, specifically relates to a gap sealed oil distribution sleeve, including oil distribution sleeve shell and bushing, bushing is supported by both sides' rolling bearing assembly in oil distribution sleeve shell, and the both ends of annular channel between oil distribution sleeve shell and bushing are equipped with sealing ring and end cover, copper base sealing sleeve is sleeved between both sides' rolling bearing on the bushing, and the clearance fit between copper base sealing sleeve and bushing, and the bushing can rotate freely in copper base sealing sleeve, copper base sealing sleeve is relatively fixed with oil distribution sleeve shell, and the oil distribution sleeve shell is installed with oil distribution block, and the oil outlet of oil distribution block is sequentially communicated with the oil hole on copper base sealing sleeve, the oil passing gap between copper base sealing sleeve and bushing, the oil channel on bushing and the shaft hole of bushing, the innovation combination of non - contact type sealing structure and copper base material has overcome the thermal failure and friction loss problem of traditional rubber sealing element significantly.

Description

Technical Field

[0001] This utility model belongs to the field of oil distribution sleeves, and specifically relates to a gap-sealing type oil distribution sleeve. Background Technology

[0002] As a core component of the drilling rig's hydraulic transmission system, the oil distribution sleeve primarily undertakes the functions of directional distribution of pressurized hydraulic fluid and dynamic sealing. Its performance directly affects the rotational efficiency of the drilling rig's power head and the reliability of the system. Currently, drilling rig oil distribution sleeves generally adopt a shaft-sleeve mating structure, relying on rubber seals (such as O-rings and step seals) at the rotating pair sealing interface to achieve dynamic sealing. This type of sealing solution maintains the sealing effect through the radial deformation of the elastomer material and the contact surface pressure, and has certain applicability under low-speed and low-pressure conditions.

[0003] However, with the increasing demands on drilling rig output torque and speed from deep well drilling and ultra-deep formation development, the limitations of traditional rubber seal structures are becoming increasingly apparent. Firstly, under high-speed rotation (>200 r / min) and high oil pressure (>35 MPa) conditions, continuous sliding friction between the rubber seal and the metal journal generates significant heat accumulation, with local contact surface temperatures reaching over 120°C, far exceeding the thermal degradation thresholds of nitrile rubber (NBR) or fluororubber (FKM) (approximately 100°C and 200°C respectively), leading to material hardening, cracking, and seal failure. Secondly, the high coefficient of friction of rubber seals (0.5-1.0) not only exacerbates the temperature rise at the sealing interface but also causes approximately 5%-8% transmission power loss. Furthermore, the high-temperature environment accelerates the carbonization of sealing grease, forming abrasive particles that intensify bushing wear, further reducing seal life (typically less than 500 hours). Statistics show that hydraulic oil leakage caused by rubber seal failure accounts for approximately 23% of unplanned drilling rig downtime, and frequent replacement of sealing components significantly increases downhole maintenance costs.

[0004] Therefore, there is an urgent need to develop new sealing structures to overcome the bottleneck of thermo-mechanical coupling failure of traditional rubber seals under high speed and high pressure. Utility Model Content

[0005] This invention aims to solve the problem of thermo-mechanical coupling failure of traditional rubber seals under high speed and high pressure.

[0006] This utility model provides the following technical solution: a gap-sealed oil distribution sleeve, comprising an oil distribution sleeve shell and a bushing. The bushing is supported and assembled in the oil distribution sleeve shell by rolling bearings on both sides. Sealing rings and end caps are installed at both ends of the annular channel between the oil distribution sleeve shell and the bushing. A copper-based sealing sleeve is fitted between the rolling bearings on both sides of the bushing. The copper-based sealing sleeve and the bushing are in a clearance fit, and the bushing can rotate freely in the copper-based sealing sleeve. The copper-based sealing sleeve and the oil distribution sleeve shell are relatively fixed. An oil distribution block is installed on the oil distribution sleeve shell. The oil outlet of the oil distribution block is connected to the oil hole on the copper-based sealing sleeve, the oil passage between the copper-based sealing sleeve and the bushing, and the oil passage on the bushing and the shaft hole of the bushing in sequence.

[0007] Furthermore, an oil distribution fixing post is connected to the oil distribution block, and the oil distribution fixing post passes through the outer shell of the oil distribution sleeve and is inserted into the oil hole of the copper-based sealing sleeve; the copper-based sealing sleeve and the outer shell of the oil distribution sleeve are fixed together by the oil distribution fixing post.

[0008] Furthermore, the inner wall of the copper-based sealing sleeve has two oil passage rings, and two oil distribution fixing posts are connected to the oil distribution block. The two oil passage rings are aligned with the two oil distribution fixing posts respectively, and the oil passage rings are aligned with the inlet of the oil passage on the bushing.

[0009] Furthermore, the inner wall of the copper-based sealing sleeve is uniformly engraved with circumferential oil reservoirs outside the two oil passage rings.

[0010] Furthermore, the bushing includes a bushing body and a bushing end cap. The bushing end cap stops at the inner ring of the rolling bearing on the left side, and the shoulder on the bushing body stops at the inner ring of the rolling bearing on the right side. The bushing end cap is fixedly connected to the bushing body, and the bushing end cap and the shoulder on the bushing body cooperate to restrict the axial movement of the bushing.

[0011] Furthermore, the sealing ring is a skeleton seal.

[0012] Furthermore, the end cap is fixed to the oil distribution sleeve housing by screws, and the end cap and the shoulder on the oil distribution sleeve housing cooperate to restrict the axial movement of the rolling bearing and the sealing ring.

[0013] Compared with the prior art, the advantages of this utility model are:

[0014] This invention provides a gap-sealed oil distribution sleeve that significantly overcomes the thermal failure and frictional loss problems of traditional rubber seals through an innovative combination of a non-contact sealing structure and copper-based materials. It achieves non-contact sealing by utilizing a dynamic pressure oil film formed by continuous oil supply within the gap, completely eliminating heat generated by sliding friction. Simultaneously, the copper-based material (such as tin bronze CuSn8) has high thermal conductivity (≥60W / m·K), which can quickly conduct residual heat to the outer shell of the oil distribution sleeve and dissipate it, keeping the sealing interface temperature stable below 60℃, far below the thermal degradation threshold of rubber materials, thus completely avoiding the problems of seal hardening and cracking caused by high temperatures. The circumferential oil reservoir on the inner wall of the copper-based sealing sleeve and the two oil passage rings form a multi-level oil storage structure, ensuring the integrity of the oil film is maintained even under extreme vibration or transient oil pressure fluctuations. The high embedding properties of the copper-based material (hardness HB60-90) can effectively adsorb carbonized abrasive particles (particle size ≤10μm) in the oil, preventing scratches from these particles on the sealing surface. Attached Figure Description

[0015] Figure 1 This is a front view of a gap-sealed oil distribution sleeve;

[0016] Figure 2 Left view of a gap-sealed oil distribution sleeve;

[0017] Figure 3 for Figure 2 Sectional view at point AA;

[0018] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0019] Figure 5 This is a top view of a gap-sealed oil distribution sleeve.

[0020] In the figure: 1-Oil distribution sleeve outer shell; 2-Busher; 2.1-Busher body; 2.2-Busher end cap; 3-Rolling bearing; 4-Sealing ring; 5-End cap; 6-Copper-based sealing sleeve; 6.1-Oil passage ring; 6.2-Oil reservoir; 7-Oil distribution block; 8-Oil distribution fixing column. Detailed Implementation

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5As shown: A gap-sealed oil distribution sleeve includes an oil distribution sleeve housing 1 and a bushing 2. The bushing 2 is supported and assembled in the oil distribution sleeve housing 1 by rolling bearings 3 on both sides. Sealing rings 4 and end caps 5 are installed at both ends of the annular channel between the oil distribution sleeve housing 1 and the bushing 2. A copper-based sealing sleeve 6 is sleeved between the rolling bearings 3 on both sides of the bushing 2. The copper-based sealing sleeve 6 and the bushing 2 are in a clearance fit, and the bushing 2 can rotate freely in the copper-based sealing sleeve 6. The copper-based sealing sleeve 6 is relatively fixed to the oil distribution sleeve housing 1. An oil distribution block 7 is installed on the oil distribution sleeve housing 1. The oil outlet of the oil distribution block 7 is connected to the shaft hole of the bushing 2 through the oil hole on the copper-based sealing sleeve 6, the oil passage between the copper-based sealing sleeve 6 and the bushing 2, and the oil passage on the bushing 2 in sequence.

[0023] The oil distribution block 7 is connected to an oil distribution fixing post 8, which passes through the oil distribution sleeve outer shell 1 and is inserted into the oil hole of the copper-based sealing sleeve 6; the copper-based sealing sleeve 6 and the oil distribution sleeve outer shell 1 are fixed together by the oil distribution fixing post 8.

[0024] The inner wall of the copper-based sealing sleeve 6 has two oil passage rings 6.1. Two oil distribution fixing posts 8 are connected to the oil distribution block 7. The two oil passage rings 6.1 are aligned with the two oil distribution fixing posts 8, and the oil passage rings 6.1 are aligned with the inlets of the oil passages on the bushing 2. The inner wall of the copper-based sealing sleeve 6 has evenly engraved circumferential oil reservoirs 6.2 outside the two oil passage rings. The circumferential oil reservoirs on the inner wall of the copper-based sealing sleeve 6, together with the two oil passage rings, form a multi-stage oil reservoir structure, ensuring the integrity of the oil film is maintained even under extreme vibration or transient oil pressure fluctuations.

[0025] The oil distribution sleeve outer shell 1, copper-based sealing sleeve 6, and end cap 5 are fixed. The bushing 2 rotates. Lubricating oil entering from the oil distribution block 7 passes through the oil distribution fixing post 8 and enters the first oil passage ring 6.1 of the copper-based sealing sleeve 6. The lubricating oil fills the gap between the copper-based sealing sleeve 6 and the bushing 2, and then enters the oil passage on the bushing 2 from the second oil passage ring 6.1. The lubricating oil then enters the interior of the bushing 2 for lubrication. A very small amount of lubricating oil seeps out from between the copper-based sealing sleeve 6 and the bushing 2 to lubricate the rolling bearing 3 and cool the rolling bearing 3 and the sealing ring 4. The sealing ring 4 prevents lubricating oil from flowing out of the oil distribution sleeve. The sealing ring 4 is a skeleton seal.

[0026] The end cap 5 is fixed to the oil distribution sleeve housing 1 by screws. The end cap 5 and the shoulder on the oil distribution sleeve housing 1 cooperate to restrict the axial movement of the rolling bearing 3 and the sealing ring 4.

[0027] Bushing 2 includes a bushing body 2.1 and a bushing end cap 2.2. The bushing end cap 2.2 is abutted against the inner ring of the left rolling bearing 3, and the shoulder on the bushing body 2.1 is abutted against the inner ring of the right rolling bearing 3. The bushing end cap 2.2 is fixedly connected to the bushing body 2.1, and the shoulder on the bushing end cap 2.2 cooperates with the bushing body 2.1 to restrict the axial movement of the bushing 2. Bushing 2 achieves precise alignment and axial positioning of the rotating pair through double rolling bearing support and axial shoulder limiting.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gap-sealed oil cup, characterized by: The device includes an oil distribution sleeve housing (1) and a bushing (2). The bushing (2) is supported and assembled in the oil distribution sleeve housing (1) by rolling bearings (3) on both sides. Sealing rings (4) and end caps (5) are installed at both ends of the annular channel between the oil distribution sleeve housing (1) and the bushing (2). A copper-based sealing sleeve (6) is fitted between the rolling bearings (3) on both sides of the bushing (2). The copper-based sealing sleeve (6) and the bushing (2) are in clearance fit. The bushing (2) can rotate freely in the copper-based sealing sleeve (6). The copper-based sealing sleeve (6) is fixed relative to the oil distribution sleeve housing (1). An oil distribution block (7) is installed on the oil distribution sleeve housing (1). The oil outlet of the oil distribution block (7) is connected to the oil hole on the copper-based sealing sleeve (6), the oil passage between the copper-based sealing sleeve (6) and the bushing (2), the oil passage on the bushing (2), and the shaft hole of the bushing (2) in sequence.

2. A gap-seal oil sleeve as set forth in claim 1, wherein: The oil distribution block (7) is connected to an oil distribution fixing column (8), which passes through the oil distribution sleeve shell (1) and is inserted into the oil hole of the copper-based sealing sleeve (6); the copper-based sealing sleeve (6) and the oil distribution sleeve shell (1) are fixed together by the oil distribution fixing column (8).

3. A gap-seal oil sleeve as set forth in claim 2 wherein: The inner wall of the copper-based sealing sleeve (6) has two oil passage rings (6.1), and two oil distribution fixing columns (8) are connected to the oil distribution block (7). The two oil passage rings (6.1) are aligned with the two oil distribution fixing columns (8) respectively, and the oil passage rings (6.1) are aligned with the inlet of the oil passage on the bushing (2).

4. A gap-seal oil sleeve as set forth in claim 3 wherein: The inner wall of the copper-based sealing sleeve (6) is uniformly engraved with circumferential oil storage grooves (6.2) outside the two oil passage rings (6.1).

5. A gap-seal oil sleeve as set forth in claim 1, wherein: The bushing (2) includes a bushing body (2.1) and a bushing end cap (2.2). The bushing end cap (2.2) stops the inner ring of the rolling bearing (3) on the left side, and the shoulder on the bushing body (2.1) stops the inner ring of the rolling bearing (3) on the right side. The bushing end cap (2.2) is fixedly connected to the bushing body (2.1), and the bushing end cap (2.2) and the shoulder on the bushing body (2.1) cooperate to restrict the axial movement of the bushing (2).

6. A gap-seal oil sleeve as set forth in claim 1, wherein: The sealing ring (4) is a skeleton seal.

7. A gap-seal oil sleeve as set forth in claim 6 wherein: The end cap (5) is fixed to the oil distribution sleeve housing (1) by screws. The end cap (5) cooperates with the shoulder on the oil distribution sleeve housing (1) to restrict the axial movement of the rolling bearing (3) and the sealing ring (4).

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