CN111293816B - Centering bearing for motor of downhole drilling tool - Google Patents
Centering bearing for motor of downhole drilling tool Download PDFInfo
- Publication number
- CN111293816B CN111293816B CN202010263742.9A CN202010263742A CN111293816B CN 111293816 B CN111293816 B CN 111293816B CN 202010263742 A CN202010263742 A CN 202010263742A CN 111293816 B CN111293816 B CN 111293816B
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- Prior art keywords
- ring
- bearing
- static
- friction surface
- motor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/04—Electric drives
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0085—Adaptations of electric power generating means for use in boreholes
Abstract
The invention discloses a centralizing bearing for an underground drilling tool motor, and relates to the technical field of underground motors. The centering bearing comprises a bearing static ring and a bearing dynamic ring, wherein a plurality of static ring notches for a stator coil to pass through are formed in the centering bearing static ring, and the inner surface of the bearing static ring is of a closed structure to form a static ring friction surface; the outer surface of the bearing moving ring forms a bearing moving ring friction surface, and the diameters of the bearing moving ring friction surface and the bearing static ring friction surface are the same as the outer diameter of the rotor iron core in size. This application sets up a plurality of quiet ring notches in quiet ring axial, and stator coil can directly pass from quiet ring notch, and the biggest radial space that utilizes the motor increases the diameter of friction surface for bearing capacity increases, and then saves the axial space of whole motor, reduces motor length.
Description
Technical Field
The invention relates to the technical field of underground motors, in particular to a sliding bearing device for motors with high length-diameter ratio (motor length/motor rotor diameter) such as an oil-submersible motor or an underground drilling tool motor, and more particularly relates to a centering bearing for the underground drilling tool motor.
Background
Downhole motors refer to motors that operate downhole for drilling or transporting fluids, and due to wellhead restrictions, such motors are typically of elongated construction with aspect ratios exceeding 50 (motor length/motor rotor diameter). Some motors are less than 200mm in diameter, but even up to more than ten meters in length. In order to ensure that the motor can safely and stably run underground, an effective air gap must be always kept between the outer diameter of a rotor of the motor and the inner diameter of a stator of the motor. If the air gap between the rotor and the stator cannot be guaranteed to be uniform, the motor can not stably run, and if violent vibration occurs, the collision or abrasion between the rotor and the stator can be more serious, so that the motor can be damaged. In view of the above, the motors of this type are provided with a plurality of sets of centering bearings in sections, and less sets of the centering bearings are used, and more sets of the centering bearings are used, so that the number of the centering bearings is ten, and more sets of the centering bearings is twenty or more. When the motor runs, the motor rotor is always kept at the central position of the motor through small-gap friction rotation between the centering bearing moving ring and the static ring, so that the air gap between the motor rotor and the stator is uniform as much as possible, and the outer surface of the motor rotor is prevented from colliding with or being abraded by the inner surface of the stator.
The traditional centralizing bearing adopted by the prior submersible motor or the motor of the underground drilling tool mainly comprises a movable ring, a static ring and a static ring support of the outer ring of the static ring, wherein the movable ring, the static ring and the static ring support are fixed on a main shaft. The stationary ring and the stationary ring support are in clearance fit. When the motor runs, an oil film friction surface is formed between the movable ring and the static ring, but because relative rotation can occur between the static ring and the static ring bearing, abrasion occurs between the static ring and the static ring bearing, the assembly gap between the static ring and the static ring bearing cannot be ensured, and therefore the static ring cannot be accurately positioned, and the bearing fails.
The state intellectual property office is in 2013 5 month 1 day, discloses a utility model patent that publication number is CN202918104U, the name is "a motor righting bearing", this utility model mainly by rightting the bearing inner circle, right the bearing outer lane, it forms to return shape locking jump ring, through returning the use of shape locking jump ring, solved the wearing and tearing problem of righting bearing outer lane and stator, the bearing uses ceramic material to do the friction pair and has avoided the influence of the metal powder that produces when traditional bearing operates lubricated and electrical apparatus performance of motor, the life of motor has been improved.
Although the problem of abrasion between the outer ring of the centering bearing and the stator can be solved in the prior art, the bearing capacity of the centering bearing cannot meet the requirement due to the limitation of the diameter size of the motor, and the bearing capacity is increased only by increasing the axial length of the centering bearing, so that the number of the centering bearings is large, the length of the whole motor is greatly corrected, and the motor is too long and cannot meet the requirement of the system.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the application provides the centralizing bearing for the underground drilling tool motor, and aims to solve the problem that the bearing capacity of the centralizing bearing cannot meet the requirement due to the limitation of the diameter size of the motor in the prior art. This application sets up a plurality of quiet ring notches in quiet ring axial, and stator coil can directly pass from quiet ring notch, and the biggest radial space that utilizes the motor increases the diameter of friction surface for bearing capacity increases, and then saves the axial space of whole motor, reduces motor length.
In order to solve the problems existing in the prior art, the method is realized by the following technical scheme:
well drilling tool motor is with righting bearing, including bearing stationary ring and bearing rotating ring, its characterized in that: the bearing static ring is formed by processing a whole piece of non-magnetic or weak magnetic material; the centering bearing static ring is provided with a plurality of static ring notches for the stator coils to pass through, and the inner surface of the bearing static ring is of a closed structure to form a static ring friction surface; the outer surface of the bearing moving ring forms a bearing moving ring friction surface, and the diameters of the bearing moving ring friction surface and the static ring friction surface are the same as the outer diameter of the rotor iron core in size; a stationary ring positioning groove is formed in the outer surface of a bearing stationary ring of the centering bearing and is matched with a stationary ring positioning key to realize circumferential positioning between the bearing stationary ring and the stator shell; and the bearing moving ring is provided with an oil throwing hole which lubricates and cools the bearing static ring friction surface and the bearing moving ring friction surface under the centrifugal action on lubricating oil during rotation.
And the bearing movable ring is provided with a movable ring axial oil through hole and a movable ring radial oil through hole.
The bearing rotating ring rotates together with the rotor spindle through the rotating ring torque transmission piece.
The two sides of the bearing static ring of the bearing are provided with a left positioning ring and a right positioning ring, the left positioning ring and the right positioning ring are provided with a sunken spigot or a raised spigot, and the spigot is matched with the spigot steps corresponding to the two sides of the bearing static ring to realize the positioning between the bearing static ring and the stator core.
Compared with the prior art, the beneficial technical effects brought by the application are shown in that:
1. according to the stator ring structure, the stator ring notch is formed in the bearing stator ring, the stator coil can pass through the stator ring notch, the radial space of the motor is utilized to the maximum extent, the diameter of a friction surface is increased, the bearing capacity is increased, the axial space of the whole motor is saved, and the length of the motor is reduced; compare in traditional scheme, this application rotating ring friction surface is the same with the rotor external diameter with quiet ring friction surface, makes the rotor cartridge stator degree of difficulty reduce to can prevent because the effect of the eccentric magnetic pull that rotor self weight or motor are permanent-magnet machine and the bearing quiet ring outer lane wearing and tearing that lead to. This application has cancelled quiet ring and has supported, has avoided the fit-up gap between quiet ring and the quiet ring to support and the bearing that rights that the possible wearing and tearing in later stage lead to became invalid, makes the bearing life-span of rightting increase.
2. Be equipped with quiet ring positioning groove on the quiet ring surface in this application, quiet ring positioning groove passes through the cooperation of quiet ring navigation key, realizes the circumference location between bearing quiet ring and the stator core. The problem of relative rotation between quiet ring and the stator has been solved through quiet ring navigation key to can effectively solve the wearing and tearing problem between quiet ring and the stator, improve the life of motor.
3. Set up the rotating ring axial oil through hole and the radial oil through hole of rotating ring on this application bearing rotating ring, the radial oil through hole of rotating ring is located rotating ring both sides edge, conveniently flows into lubricating oil between rotor and the stator, and the axial oil through hole helps the flow of axial lubricating oil.
4. The utility model provides an oilhole is got rid of to the bearing rotating ring, and the bearing rotating ring is passed through the rotating ring and is turned round the key and rotate together with the rotor spindle, and the rotating ring gets rid of the oilhole simultaneously and lubricates and cools off bearing quiet ring inner friction face and bearing rotating ring outer friction face through rotatory centrifugal force.
5. The both sides of the bearing quiet ring of bearing are equipped with left side holding ring and right side holding ring to this application, are provided with sunken or bellied tang on left side holding ring and the right side holding ring, and the tang step cooperation that this tang and bearing quiet ring both sides correspond realizes the location between bearing quiet ring and the stator core, and this kind of structure can be fixed quiet ring on stator housing, prevents to take place relative rotation between quiet ring and the stator core, causes the wearing and tearing between quiet ring and the stator core.
Drawings
FIG. 1 is a cross-sectional view of a centering bearing structure of the present application;
FIG. 2 is a cross-sectional view of a centering bearing structure of the present application;
FIG. 3 is an enlarged view of a portion of FIG. 1 of the present application;
FIG. 4 is a schematic view of a static ring structure of a bearing according to the present application;
FIG. 5 is a schematic view of a bearing rotating ring structure according to the present application;
reference numerals: 1. stator casing, 2, left side holding ring, 3, bearing rotating ring, 4, bearing stationary ring, 5, right side holding ring, 6, stator core, 7, stator coil, 8, left side rotor core, 9, rotor spindle, 10, air gap, 11, axial oil through hole, 12, right side rotor core, 13, stationary ring constant head tank, 14, stationary ring notch, 15, stationary ring position key, 16, rotating ring oil flinging hole, 17, rotating ring torque transmission key (17), 18, radial oil through hole, 19, stationary ring friction surface, 20, rotating ring friction surface.
Detailed Description
The technical scheme of the application is further elaborated in the following by combining the drawings in the specification.
Example 1
Referring to the accompanying drawings 1, 2, 3 and 4, this embodiment discloses:
the centralizing bearing for the underground drilling tool motor comprises a bearing static ring and a bearing dynamic ring, wherein the bearing static ring is formed by processing a whole piece of non-magnetic or weak magnetic material; the centering bearing static ring is provided with a plurality of static ring notches for the stator coils to pass through, and the inner surface of the bearing static ring is of a closed structure to form a static ring friction surface; the outer surface of the bearing moving ring forms a bearing moving ring friction surface, and the diameters of the bearing moving ring friction surface and the static ring friction surface are the same as the outer diameter of the rotor iron core in size; a stationary ring positioning groove is formed in the outer surface of a bearing stationary ring of the centering bearing and is matched with a stationary ring positioning key to realize circumferential positioning between the bearing stationary ring and the stator shell; and the bearing moving ring is provided with an oil throwing hole which lubricates and cools the bearing static ring friction surface and the bearing moving ring friction surface under the centrifugal action on lubricating oil during rotation. In the embodiment, the stationary ring notch is formed in the stationary ring of the bearing, the stator coil can pass through the stationary ring notch, the radial space of the motor is utilized to the maximum extent, the diameter of a friction surface is increased, the bearing capacity is increased, the axial space of the whole motor is saved, and the length of the motor is reduced; compare in traditional scheme, this application rotating ring friction surface is the same with the rotor external diameter with quiet ring friction surface, makes the rotor cartridge stator degree of difficulty reduce to can prevent because the effect of the eccentric magnetic pull that rotor self weight or motor are permanent-magnet machine and the bearing quiet ring outer lane wearing and tearing that lead to. This application has cancelled quiet ring and has supported, has avoided the fit-up gap between quiet ring and the quiet ring to support and the bearing that rights that the possible wearing and tearing in later stage lead to became invalid, makes the bearing life-span of rightting increase.
Example 2
As another preferred embodiment of the present application, referring to fig. 1-5 of the specification, the present embodiment discloses:
as shown in fig. 1, the centralizing bearing for the downhole drilling tool motor comprises a bearing static ring and a bearing dynamic ring, wherein the bearing static ring is formed by processing a whole piece of non-magnetic or weak magnetic material; the centering bearing static ring is provided with a plurality of static ring notches for the stator coils to pass through, and the inner surface of the bearing static ring is of a closed structure to form a static ring friction surface; the outer surface of the bearing moving ring forms a bearing moving ring friction surface, and the diameters of the bearing moving ring friction surface and the static ring friction surface are the same as the outer diameter of the rotor iron core in size; a stationary ring positioning groove is formed in the outer surface of a bearing stationary ring of the centering bearing and is matched with a stationary ring positioning key to realize circumferential positioning between the bearing stationary ring and the stator shell; and the bearing moving ring is provided with an oil throwing hole which lubricates and cools the bearing static ring friction surface and the bearing moving ring friction surface under the centrifugal action on lubricating oil during rotation. As shown in fig. 5, the bearing rotating ring is provided with a rotating ring axial oil through hole and a rotating ring radial oil through hole. The bearing rotating ring rotates together with the rotor spindle through the rotating ring torque transmission piece.
Example 3
As another preferred embodiment of the present application, referring to fig. 1-5 of the specification, the present embodiment discloses:
the application discloses motor righting bearing is a plain bearing equipment that is used for diving oil motor or downhole drilling motor etc. to have high draw ratio (motor length/motor rotor diameter) motor. The device mainly comprises a fixed part and a rotating part.
The fixing portion includes: the bearing static ring 4, the left positioning ring 2, the right positioning ring 5 and the like. The bearing static ring 4 is made of a whole piece of non-magnetic or weak magnetic conductive material, a plurality of static ring notches 14 are formed in the bearing static ring 4, the stator coil 7 can directly penetrate through the static ring notches 14, and the inner surface of the bearing static ring is of a closed structure to form a static ring friction surface 19; the bearing static ring is provided with a positioning groove 13 and is circumferentially positioned with the stator shell through the static ring positioning groove 13 and a static ring positioning key 15; the left positioning ring 2 and the right positioning ring 5 are provided with sunken or raised spigots, and the spigots at corresponding positions on the static ring 4 axially position the bearing static ring 4 together with the stator core 6.
The rotating portion includes: the bearing rotating ring 3, the rotating ring torque transmission key (17) 17 and the like. Wherein, the bearing rotating ring 3 is provided with a rotating ring axial oil through hole 11, a rotating ring radial oil through hole 18 and a rotating ring oil throwing hole 16. The bearing moving ring 3 rotates together with the rotor spindle 9 through a moving ring torque transmission key (17) 17, and simultaneously, the moving ring oil throwing hole lubricates and cools a bearing static ring friction surface 19 and a bearing moving ring friction surface 20 through rotating centrifugal force.
The basic principle is as follows: the static ring friction surface 19 and the bearing dynamic ring friction surface 20 of the motor centering bearing form a pair of rotary motion pairs. The bearing static ring 4 is accurately positioned by the stator casing 1, the left positioning ring 2, the right positioning ring 5, the bearing static ring positioning key 15 and the stator iron core 6. The inner side of the static ring is a whole circle of cylindrical surface which forms a static ring friction surface 19 of the revolute pair; the outer cylindrical surface of the bearing rotating ring forms a rotating pair rotating ring friction surface 20, the bearing rotating ring 3 is sleeved on the rotor spindle 9 and rotates together with the rotor spindle 9 through a rotating ring torque transmission key (17) 19. In order to ensure the size of the air gap 10, the diameter of the outer side of the bearing rotating ring (the bearing rotating ring friction surface 20), the diameter of the inner side of the static ring (the bearing static ring friction surface 19) and the outer diameter of the rotor core 6 are basically the same in size. As shown in fig. 3, the left rotor core 8, the moving ring friction surface 20 of the moving ring and the right rotor core 12 are substantially in the same cylindrical surface; the inner friction surface 19 of the static ring and the outer friction surface 20 of the dynamic ring are designed to give an assembly clearance so as to ensure that the bearing can provide proper radial load when working and cannot generate larger friction power; while at the same time satisfying the flexible rotation of the rotor spindle 9. The bearing rotating ring 3 is provided with a plurality of axial oil through holes 11 and radial oil throwing holes 16, and the arrangement of the oil holes can effectively lubricate the space between the bearing rotating ring 3 and the rotating pair of the bearing static ring 4 and take away heat generated by friction, so that the effect of protecting the bearing rotating pair (the inner friction surface 19 of the bearing static ring and the outer friction surface 20 of the bearing rotating ring) is achieved.
As can be seen from fig. 1, 2 and 3, the structure utilizes the radial dimension of the motor to the maximum extent, increases the bearing area of the bearing, and improves the load capacity of the bearing; further saving the axial space of the whole motor and reducing the length of the motor; because the diameter of the friction surfaces (the inner friction surface 19 of the bearing static ring and the outer friction surface 20 of the bearing moving ring) is the same as the outer diameter of the rotor core, the difficulty of inserting the rotor into the stator is reduced, and the abrasion of the outer ring of the bearing static ring 4 caused by the self weight of the rotor or the action of eccentric magnetic pull force when the motor is a permanent magnet motor can be prevented; meanwhile, the static ring support is cancelled, so that the assembly gap between the static ring and the static ring support and the failure of the centering bearing caused by possible later-stage abrasion are avoided, and the service life of the centering bearing is prolonged.
Claims (4)
1. Well drilling tool motor is with righting bearing, including bearing stationary ring (4) and bearing rotating ring (3), its characterized in that: the bearing static ring (4) is formed by processing a whole piece of non-magnetic or weak magnetic material; a plurality of static ring notches (14) for the stator coils (7) to pass through are formed in the bearing static ring (4), and the inner surface of the bearing static ring (4) is of a closed structure to form a static ring friction surface (19); the outer surface of the bearing moving ring (3) forms a bearing moving ring friction surface (20), and the diameters of the bearing moving ring friction surface (20) and the static ring friction surface (19) are the same as the outer diameter of the rotor core; a stationary ring positioning groove (13) is formed in the outer surface of a bearing stationary ring (4) of the centering bearing, and the stationary ring positioning groove (13) is matched with a stationary ring positioning key (15) to realize circumferential positioning between the bearing stationary ring (4) and the stator casing (1); the bearing rotating ring (3) is also provided with a rotating ring oil throwing hole (16) which lubricates and cools a static ring friction surface and a bearing rotating ring friction surface (20) through the centrifugal action on lubricating oil during rotation.
2. The centralizing bearing for a downhole drilling motor of claim 1, wherein: the bearing moving ring (3) is provided with a moving ring axial oil through hole (11) and a moving ring radial oil through hole (18).
3. The centralizing bearing for a downhole drilling motor of claim 1, wherein: the bearing rotating ring (3) rotates together with the rotor spindle (9) through a rotating ring torque transmission piece.
4. The centralizing bearing for a downhole drilling motor of claim 1, wherein: the two sides of a bearing static ring (4) of the bearing are righted to be provided with a left positioning ring (2) and a right positioning ring (5), a sunken or a raised spigot is arranged on the left positioning ring (2) and the right positioning ring (5), and the spigot is matched with spigot steps corresponding to the two sides of the bearing static ring (4) to realize the positioning between the bearing static ring (4) and a stator core (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010263742.9A CN111293816B (en) | 2020-04-07 | 2020-04-07 | Centering bearing for motor of downhole drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010263742.9A CN111293816B (en) | 2020-04-07 | 2020-04-07 | Centering bearing for motor of downhole drilling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111293816A CN111293816A (en) | 2020-06-16 |
| CN111293816B true CN111293816B (en) | 2021-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010263742.9A Active CN111293816B (en) | 2020-04-07 | 2020-04-07 | Centering bearing for motor of downhole drilling tool |
Country Status (1)
| Country | Link |
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| CN (1) | CN111293816B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6091175A (en) * | 1998-03-12 | 2000-07-18 | Camco International, Inc. | Self-centering rotor bearing assembly for submersible pump motors |
| CN202039791U (en) * | 2011-04-11 | 2011-11-16 | 李锋 | Built-in fixed sucker rod centralizer |
| CN202142969U (en) * | 2011-08-16 | 2012-02-08 | 中国石油天然气股份有限公司 | Permanent magnet synchronous servo control submersible motor with low rotating speed and large torque |
| CN202918104U (en) * | 2012-11-14 | 2013-05-01 | 中国石油大学(华东) | Motor straightening bearing |
| CN104539067A (en) * | 2014-12-05 | 2015-04-22 | 湖北西浦电机科技有限责任公司 | High-power-mass-rate direct-drive permanent-magnet synchronous motor of submersible progressing cavity pump |
| CN110048564B (en) * | 2019-04-18 | 2021-08-03 | 沈阳工业大学 | Double-stator multi-unit serial connection type ultra-high temperature submersible motor |
-
2020
- 2020-04-07 CN CN202010263742.9A patent/CN111293816B/en active Active
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| CN111293816A (en) | 2020-06-16 |
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