A hydraulic model of a bearing seal for an electric submersible pump

Abstract

A kind of electric submersible pump hydraulic model bearing type bearing sealing device belongs to electric submersible pump technical field.Inner ring is equipped with sealing ring one, outer wall is equipped with convex ring, equidistant ball groove one and ball groove two corresponding and the number, two ring grooves one and equidistributed ball groove three, convex ring has the oil hole for communicating corresponding ball groove one and ball groove two, ball groove three is communicated with corresponding oil hole, ball one, two, three are placed in corresponding ball groove, two outer ring sleeve is set in inner ring, sealing shell sleeve is set in outer ring, support ring (inner wall is equipped with sealing ring two) is assembled between inner ring and sealing shell and abuts against outer ring, sealing ring two is embedded in ring groove one, sealing plate is arranged on both sides of sealing shell, short bolt is fixed sealing shell and sealing plate, long bolt is locked after being arranged in each component by nut.The utility model adopts the design of "bearing-sealing-lubrication", and solves the key problems such as unstable shafting support, sealing failure and excessive wear, optimizes the key performance comprehensively, prolongs the service life, and improves the operation stability and economy of electric submersible pump hydraulic model.

Description

Technical Field

[0001] This utility model belongs to the field of electric submersible pump technology, specifically a bearing sealing device for a hydraulic model of an electric submersible pump. Background Technology

[0002] Electric submersible pumps (ESPs) are critical equipment used for underwater or deep well pumping, and the bearing seals of their hydraulic models directly affect the pump's operational reliability and service life. Existing ESP hydraulic models often employ single-seal structures (such as lip seals or packing seals), which only achieve basic sealing functions and have the following drawbacks: 1. Weak load-bearing capacity: When the electric submersible pump is running, the pump shaft will generate large axial and radial forces. The existing sealing device lacks a dedicated load-bearing mechanism, and the force acts directly on the sealing components, resulting in deformation and accelerated wear of the sealing end face, which in turn leads to sealing failure. 2. Poor sealing reliability: Under high pressure and high speed conditions, the sealing surface fit of a single sealing structure is easily disturbed, leading to media leakage; Therefore, there is an urgent need to design a bearing sealing device that combines strong load-bearing capacity and high sealing reliability to solve the above-mentioned technical problems. Summary of the Invention

[0003] To address the problems existing in the background technology, this utility model provides a bearing sealing device for a hydraulic model of an electric submersible pump.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a bearing sealing device for a hydraulic model of an electric submersible pump, comprising an inner ring, a convex ring, two outer rings, a sealing shell, two support rings, two sealing rings II, two sealing plates, multiple sealing rings I, multiple ball I, multiple ball II, multiple ball III, multiple short bolts, multiple long bolts, and multiple nuts. The inner ring has multiple sealing rings 1 evenly distributed along the axial direction on its inner wall. The outer wall of the inner ring has a convex ring, multiple ball grooves 1, multiple ball grooves 2, and two annular grooves 1. The number of ball grooves 1 and ball grooves 2 is equal and they are arranged in a one-to-one correspondence along the circumference. The convex ring is located between the ball grooves 1 and 2, and the ball grooves 1 and 2 are located between the two annular grooves 1. Multiple oil holes are evenly distributed on the side wall of the convex ring, each oil hole communicating with its corresponding ball grooves 1 and 2 at both ends. Multiple ball grooves 3 are evenly distributed on the radially outer side wall of the convex ring, each ball groove 3 communicating with its corresponding oil hole. Multiple ball bearings 1 are respectively disposed in their corresponding ball grooves 1, and multiple ball bearings 2 are respectively disposed in their corresponding ball grooves 2. Three balls are respectively set in the corresponding ball grooves. The two outer rings are symmetrically sleeved on the outer wall of the inner ring with the convex ring as the center of symmetry. The sealing shell is sleeved on the outer wall of the two outer rings. The inner wall of the two support rings is provided with sealing rings. The two support rings are respectively assembled between the inner ring and the sealing shell and abut against the corresponding outer ring side wall. Each sealing ring is embedded in the corresponding ring groove. The two sealing plates are respectively set on both sides of the sealing shell and abut against the corresponding support rings. The sealing shell is fixedly connected to the two sealing plates by short bolts. The multiple long bolts are evenly distributed along the circumference of the sealing plates and pass through the two sealing plates, the two support rings and the two outer rings, and are axially locked and fixed by the corresponding nuts.

[0005] Each outer ring inner wall is provided with an annular groove II, each annular groove II corresponding to and cooperating with multiple ball grooves I and multiple ball grooves II, and forming a closed lubrication oil passage with the corresponding oil hole.

[0006] Each of the two sealing rings has a gap between itself and the corresponding annular groove for storing lubricating fluid.

[0007] The two outer rings have corresponding arc-shaped mating surfaces that are in contact with the multiple rolling balls in a three-rolling manner.

[0008] Compared with the prior art, the beneficial effects of this utility model are: 1. Excellent load-bearing performance and significantly improved operational stability: Three sets of independent radial load-bearing pairs are evenly distributed along the axial direction, which can simultaneously share the radial load of the shaft system, significantly reducing the stress concentration of individual balls. Compared with the traditional single-set load-bearing structure, the upper limit of load-bearing capacity and impact resistance are significantly enhanced. At the same time, rolling friction replaces sliding friction, reducing motion resistance and energy loss. The axial separation design of the convex ring avoids ball rotation interference, ensuring the smooth operation of the shaft system at high speed and effectively controlling temperature rise.

[0009] 2. Comprehensive sealing protection and thorough media isolation: The three-dimensional sealing structure of "radial sealing ring + axial sealing plate" is adopted, and the liquid seal barrier formed by sealing ring 2 and ring groove 1 effectively blocks the intrusion of external fluids, mud and other impurities, and completely eliminates sealing blind spots. The sealing structure also prevents lubricant leakage, creating a closed and clean environment for circulating lubrication, and is suitable for working conditions with many impurities and harsh media.

[0010] 3. Highly efficient and long-lasting lubrication, with significant optimization of wear and heat dissipation: The centrifugal circulating lubrication design utilizes the centrifugal force generated by the shaft rotation to drive the lubricant to fully cover the three sets of bearing contact surfaces, forming a stable oil film. This transforms metal-to-metal contact into oil film friction, significantly reducing the wear rate. The flowing lubricant can simultaneously carry away operating heat, and the oil circuit cleanliness ensured by the sealed structure prevents lubrication failure and extends the maintenance-free cycle of the device.

[0011] 4. Collaborative closed-loop empowerment, overall reliability and economy improved: uniform load distribution of load-bearing components avoids compression deformation of sealing surfaces and ensures stable sealing gaps; all-round protection of the seal provides a clean basis for lubrication, and the low wear characteristics of lubrication further enhance the load-bearing and sealing effects. The three form a positive cycle, significantly improving the long-term operational reliability of the shaft system and reducing the probability of downtime and maintenance costs.

[0012] In summary, this utility model, through a synergistic closed-loop design of "load-sealing-lubrication," specifically addresses core issues such as unstable shaft support, seal failure, and excessive wear in electric submersible pump hydraulic models. It achieves comprehensive optimization in load-bearing capacity, sealing effect, lubrication efficiency, and operational reliability, effectively extending the service life of the device and improving the operational stability and economy of the electric submersible pump hydraulic model. Attached Figure Description

[0013] Figure 1 This is a front view of the present invention; Figure 2 This is a schematic diagram of the inner ring structure of this utility model. Detailed Implementation

[0014] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0015] This embodiment describes a bearing sealing device for a hydraulic model of an electric submersible pump, including an inner ring 1, a convex ring 3, two outer rings 7, a sealing shell 8, two support rings 9, two sealing rings 10, two sealing plates 11, multiple sealing rings 2, multiple ball bearings 4, multiple ball bearings 5, multiple ball bearings 6, multiple short bolts, multiple long bolts 12, and multiple nuts 13. The inner ring 1 has multiple sealing rings 2 evenly distributed along the axial direction on its inner wall. The outer wall of the inner ring 1 has a convex ring 3, multiple ball grooves 1, multiple ball grooves 2, and two annular grooves 102. The number of ball grooves 1 and ball grooves 2 is equal and they are arranged in a one-to-one correspondence along the circumference. The convex ring 3 is located between the ball grooves 1 and ball grooves 2, and the ball grooves 1 and ball grooves 2 are located between the two annular grooves 102. The side wall of the convex ring 3 has multiple oil holes 101 evenly distributed, and each oil hole 101 is connected to the corresponding ball groove 1 and ball groove 2 at both ends. The radial outer wall of the convex ring 3 has multiple ball grooves 3 evenly distributed, and each ball groove 3 is connected to the corresponding oil hole 101. The multiple ball balls 1 4 are respectively disposed in the corresponding ball groove 1, the multiple ball balls 2 5 are respectively disposed in the corresponding ball groove 2, and the multiple ball balls 3 6 are respectively disposed in the corresponding ball groove 2. The two outer rings 7 are symmetrically fitted on the outer wall of the inner ring 1 with the convex ring 3 as the center of symmetry. The sealing shell 8 is fitted on the outer wall of the two outer rings 7. The inner wall of each of the two support rings 9 is provided with a second sealing ring 10. The two support rings 9 are respectively assembled between the inner ring 1 and the sealing shell 8 and abut against the side wall of the corresponding outer ring 7. Each second sealing ring 10 is embedded in the corresponding ring groove 102. The two sealing plates 11 are respectively set on both sides of the sealing shell 8 and abut against the corresponding support rings 9. The sealing shell 8 is fixedly connected to the two sealing plates 11 by short bolts. The multiple long bolts 12 are evenly distributed around the circumference of the sealing plates 11 and pass through the two sealing plates 11, the two support rings 9 and the two outer rings 7, and are axially locked and fixed by the corresponding nuts 13.

[0016] Each outer ring 7 has an inner wall with an annular groove 2. Each annular groove 2 is respectively matched with multiple ball grooves 1 and multiple ball grooves 2, and forms a closed lubrication oil circuit with the corresponding oil hole 101.

[0017] Each of the sealing rings 10 and the corresponding ring groove 102 has a gap for storing lubricating fluid.

[0018] The two outer rings 7 have corresponding arc-shaped mating surfaces that are in contact with the rolling contact surfaces of the multiple ball bearings 6.

[0019] The core working principle of this utility model is to achieve high stability support, absolute media isolation, and long-term wear protection for the hydraulic model shaft system of the electric submersible pump through the coordinated linkage of "division of labor between moving and stationary components + triple radial bearing + double three-dimensional sealing + centrifugal circulating lubrication". The three elements mutually empower each other to form a closed-loop guarantee. Specifically, the inner ring 1 is fixed to the shaft of the electric submersible pump with an interference fit and rotates synchronously with the shaft at high speed, serving the dual functions of bearing adaptation and sealing reference. Multiple long bolts 12 are evenly distributed circumferentially, passing through two sealing plates 11, support ring 9, and outer ring 7, and are axially locked by nuts 13, so that the outer ring 7, sealing shell 8, support ring 9, and sealing plate 11 constitute a stationary component, which is connected to the rotating shaft. The rotating inner ring forms a precise fit clearance, providing a structural foundation for subsequent load bearing, sealing, and lubrication. Ball 1 4 and Ball 2 5 are respectively embedded between the ball groove 1 and ball groove 2 of the inner ring 1 and the ring groove 2 of the outer ring 7. Ball 3 6 fits against the ball groove 3 of the convex ring 3 and the arc-shaped mating surface of the outer ring 7. Together, they form three sets of independent radial load bearing pairs, which are evenly distributed along the axial direction to synchronously share the radial load of the shaft system, greatly reducing the stress concentration of individual balls and improving the overall load bearing capacity and impact resistance of the device. The convex ring 3 axially separates the three sets of balls to avoid mutual interference during rotation. At the same time, the rolling friction between the balls and the groove replaces the sliding friction, realizing low-friction motion transmission and reducing energy loss and temperature rise. In terms of sealing protection, multiple sealing rings 1-2 on the inner wall of the inner ring 1 are arranged closely along the axial direction, directly blocking external fluids, mud and other impurities from entering the mating surface between the shaft and the inner ring. The sealing ring 2-10 on the support ring 9 is embedded in the annular groove 102 of the inner ring 1. The gap between the two stores lubricant to form a liquid seal barrier. The static pressure head of the lubricant blocks external impurities from entering the core moving area, while also providing auxiliary lubrication to the contact surface. The sealing plates 11 on both sides are fixed to the sealing shell 8 by short bolts. The sealing plates 11 abut against the end face of the support ring 9, forming a three-dimensional sealing structure of "axial + radial", completely eliminating sealing blind spots. The sealing structure can also prevent lubricant leakage in the oil circuit and provide a closed environment for circulating lubrication. The circulating lubrication relies on the oil hole 101 of the convex ring 3 to connect ball groove one, ball groove two and ball groove three, which together with the ring groove two of the outer ring 7 form a closed lubrication oil circuit. The lubricant is initially stored in this closed oil circuit. When the shaft rotates, the centrifugal force generated by the inner ring 1 driving the rolling balls drives the lubricant to circulate along the path of "ball groove one → oil hole → ball groove three → oil hole → ball groove two → circulation to ball groove one", realizing full coverage lubrication of the three sets of rolling ball contact surfaces. The lubricant forms an extremely thin oil film on the contact surface, transforming metal contact into oil film friction, greatly reducing wear and temperature rise. At the same time, the flowing lubricant can carry away the heat generated during operation. The sealing structure ensures the cleanliness of the medium in the oil circuit, preventing impurities from scratching the raceway or clogging the oil hole, and achieving long-term stable lubrication. Ultimately, the uniform load distribution of the load-bearing components reduces the extrusion deformation of the sealing surface, ensuring the stability of the sealing gap. The all-round protection of the sealing structure provides a clean environment for the lubrication circuit, avoiding lubrication failure. Circulating lubrication not only reduces wear on the load-bearing pair, but also enhances the liquid seal effect. The three form a closed loop of "stable load-bearing → tight sealing → excellent lubrication → more stable load-bearing", which significantly improves the operational reliability and service life of the device.

[0020] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A bearing sealing device for a hydraulic model of an electric submersible pump, characterized in that: Includes an inner ring (1), a convex ring (3), two outer rings (7), a sealing shell (8), two support rings (9), two sealing rings (10), two sealing plates (11), multiple sealing rings (2), multiple ball bearings (4), multiple ball bearings (5), multiple ball bearings (6), multiple short bolts, multiple long bolts (12), and multiple nuts (13). The inner ring (1) has multiple sealing rings (2) evenly distributed along the axial direction on its inner wall. The outer wall of the inner ring (1) has a convex ring (3), multiple ball grooves (1), multiple ball grooves (2), and two annular grooves (102). The number of ball grooves (1) and ball grooves (2) are equal and arranged in a one-to-one correspondence along the circumferential direction. The convex ring (3) is located between the ball grooves (1) and ball grooves (2), and the ball grooves (1) and ball grooves (2) are located between the two annular grooves (102). The side wall of the convex ring (3) has multiple oil holes (101) evenly distributed. Each oil hole (101) is connected to the corresponding ball groove (1) and ball groove (2) at both ends. The outer radial side wall of the convex ring (3) has multiple ball grooves (3) evenly distributed. Each ball groove (3) is connected to the corresponding oil hole (101). The multiple ball balls (1) (4) are respectively set in the corresponding ball groove (1), the multiple ball balls (2) (5) are respectively set in the corresponding ball groove (2), and the multiple ball balls (3) (6) are respectively set in the corresponding ball groove (101). Inside the groove three, the two outer rings (7) are symmetrically fitted on the outer wall of the inner ring (1) with the convex ring (3) as the center of symmetry. The sealing shell (8) is fitted on the outer wall of the two outer rings (7). The inner wall of the two support rings (9) is provided with sealing ring two (10). The two support rings (9) are respectively assembled between the inner ring (1) and the sealing shell (8) and abut against the side wall of the corresponding outer ring (7). Each sealing ring two (10) is embedded in the corresponding ring groove one (102). The two sealing plates (11) are respectively set on both sides of the sealing shell (8) and abut against the corresponding support ring (9). The sealing shell (8) is fixedly connected to the two sealing plates (11) by short bolts. The multiple long bolts (12) are evenly distributed around the sealing plate (11) and pass through the two sealing plates (11), the two support rings (9) and the two outer rings (7), and are axially locked by the corresponding nuts (13).

2. The bearing sealing device for a hydraulic model of an electric submersible pump according to claim 1, characterized in that: Each outer ring (7) has an inner wall with a second ring groove. Each second ring groove is respectively matched with a plurality of first ball grooves and a plurality of second ball grooves, and forms a closed lubrication oil circuit with the corresponding oil hole (101).

3. The bearing sealing device for a hydraulic model of an electric submersible pump according to claim 1, characterized in that: Each of the sealing rings 2 (10) has a gap between it and the corresponding ring groove 1 (102) for storing lubricating fluid.

4. The bearing sealing device for a hydraulic model of an electric submersible pump according to claim 1, characterized in that: The two outer rings (7) have corresponding arc-shaped mating surfaces that are in contact with the rolling contact surfaces of the multiple ball bearings (6).

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