CN104836366B - Anti- eccentric wear submersible motor - Google Patents
Anti- eccentric wear submersible motor Download PDFInfo
- Publication number
- CN104836366B CN104836366B CN201510247854.4A CN201510247854A CN104836366B CN 104836366 B CN104836366 B CN 104836366B CN 201510247854 A CN201510247854 A CN 201510247854A CN 104836366 B CN104836366 B CN 104836366B
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- China
- Prior art keywords
- bearing
- eccentric wear
- rotating shaft
- thrust
- taper
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Classifications
-
- 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
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
-
- 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
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/132—Submersible electric motors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention discloses a kind of anti-eccentric wear submersible motor,Base,Pressure regulation membrane cover,Pressure regulator membrane,Shell,Rotor,Stator and rotating shaft,Set by thrust disc in rotating shaft one end,Taper tubular thrust bearing,The first anti-eccentric wear bearing arrangement that first inner pedestal and the first outer bearing carrier are constituted,The other end is set by thrust disc,Taper tubular thrust bearing,The second anti-eccentric wear bearing arrangement that second inner pedestal and the second outer bearing carrier are constituted,Thrust disc includes a trapezoidal revolving body,Taper tubular thrust bearing is water lubricating bearing material,Taper tubular thrust bearing has preferable guidance quality with the taper fit face of thrust disc,When motor is horizontal to be used,Ensure that radial positioning of the rotating shaft in the case where there is responsive to axial force,Taper thrust disc and mutually compressed with taper tubular thrust bearing,Self-centering,Ensure that rotor radial direction non-displacement in use,Rotor is concentric with stator,Can prevent eccentric wear phenomenon in motor from producing.
Description
Technical field
The present invention relates to submersible motor technical field.
Background technology
Well immersible pump particularly high-lift submersible pump product is the visual plant of deep-well water lift, by underground water lifting to ground
Table, be domestic water, mine speedily carry out rescue work, industry cooling, field irrigation, the important tool of seawater lift etc..The external diameter of immersible pump
Limited in slender type by its installation dimension, but in this immersible pump of the normal vertical use of the special occasions such as such as mine emergency simultaneously
It is improper, it is necessary to it is horizontal use or there is certain angle of inclination to use.But the horizontal use of immersible pump can cause to turn in pump motor
Son due to producing eccentric wear phenomenon between Action of Gravity Field and guide bearing, water pump after the operation of this state for extended periods rotor relative to fixed
Son generation is eccentric, and gap is uneven between upper lower magnetic pole, and motor internal forms unbalanced magnetic pull（Unilateral magnetic force）, make bearing
Stress accelerates it to wear and tear all the time for side, produce vibrations and noise, it is final that the mutual friction of rotor phase occurs until motor damage.This
Sample constrains use occasion and the environment of immersible pump using the service life for greatly reducing water pump.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of anti-eccentric wear submersible motor, its simple structure, can prevent electricity
Eccentric wear phenomenon is produced, ensures that rotor is concentric with stator in machine, can be horizontal or under having the use condition at certain angle of inclination
Use, expand the use scope of motor.
In order to solve the above technical problems, the technical solution used in the present invention is：
A kind of anti-eccentric wear submersible motor, including base, pressure regulation membrane cover, pressure regulator membrane, shell, rotor, stator and rotating shaft, it is special
Levy and be：The rotating shaft two ends are equipped with one group of anti-eccentric wear bearing arrangement, and the respectively first anti-eccentric wear bearing arrangement and second resist
Eccentric wear bearing arrangement, the first anti-eccentric wear bearing arrangement includes being sleeved on thrust disc, the taper tubular thrust of rotating shaft upper end
Bearing, the first outer bearing carrier and the first inner pedestal, the second anti-eccentric wear bearing arrangement include being sleeved on rotating shaft bottom
Thrust disc, taper tubular thrust bearing and the second inner pedestal and the second outer bearing carrier, the thrust disc include one trapezoidal time
Swivel, makes thrust disc upper and lower surface form circular conical surface, and the taper tubular thrust bearing structure is to select water lubricating bearing material
The taper tubular of formation, the taper tubular thrust bearing respectively with thrust disc, the first outer bearing carrier, the first inner pedestal,
Two inner pedestals and the second outer bearing carrier are cone match.
Preferably, first outer bearing carrier, the first inner pedestal, the second inner pedestal and the second outer bearing carrier are equipped with
The taper concave surface coordinated with taper tubular thrust bearing, the taper tubular thrust bearing is fixed in taper concave surface, and described the
It is provided with seal between one outer bearing carrier and the mating surface of rotating shaft, the structure phase of first inner pedestal and the second inner pedestal
Together, it is equipped with the cylinder with rotating shaft cooperation and guide bearing is provided between cylinder and rotating shaft, the second outer bearing carrier middle part is inboard
It is provided with deep gouge, outside and is provided with the deep-slotted chip breaker coordinated with base middle part fastening bolt, the deep gouge is used to accommodate roller end.
Preferably, the taper tubular thrust bearing is separately fixed at the first outer bearing carrier, the first interior axle by screw
In bearing, the second inner pedestal and the second outer bearing carrier, the thrust disc passes through key connecting with rotating shaft, with taper tubular thrust shaft
Holding the thrust disc outer surface being rotatably assorted has a wearing layer, and the wearing layer selects the high-abrasive material, the high-abrasive material to be
3Cr13。
Preferably, the water lubricating bearing material is carbon graphite material, and the thrust disc generally 3Cr13 materials are described
Seal is oil sealing.
Preferably, the barrel of the taper tubular thrust bearing is laid with open slot and open slot court along generatrix direction
To the miner diameter end of taper tubular thrust bearing, the screw is arranged at open slot through taper tubular thrust bearing position.
Preferably, the stop spiral shell coordinated with rotating shaft is provided between the thrust disc and oil sealing of the described first anti-eccentric wear bearing arrangement
The thrust side surface of mother, the rotating shaft bottom shaft shoulder and the second anti-eccentric wear bearing arrangement coordinates
Preferably, taper annular groove is equipped with the taper concave surface of first outer bearing carrier and the second outer bearing carrier, it is described
The bottom of the second outer bearing carrier is provided with annular boss and its deep gouge bottom is provided with through hole, base middle part inboard be provided with it is convex
The annular inner card cage that platform coordinates, the fastening bolt coordinates with the screwed hole of inner card cage bottom centre.
It is using the beneficial effect produced by above-mentioned technical proposal：By thrust disc, taper tubular thrust bearing, outer bearing
The anti-eccentric wear bearing arrangement of seat and inner pedestal composition is arranged on rotating shaft two ends, due to taper tubular thrust bearing and thrust disc phase
There is preferable guidance quality after mutually coordinating, countershaft applies also to be applied with the radial load for pointing to axle center while axial reaction force,
It is easy to centering in the presence of external force, this anti-eccentric wear bearing arrangement is applied on submersible motor, when motor is horizontal to be used, turns
The axial force of axle is finally acted on to taper tubular thrust bearing through thrust disc, and both are cone match, taper thrust disc and and
Taper tubular thrust bearing is mutually compressed, it is ensured that motor internal rotor radial direction non-displacement in use, it is ensured that rotor with it is fixed
It is sub concentric；Taper tubular thrust bearing selects 3Cr13 materials from carbon graphite material, thrust disc, and both of which can be in water lubrication shape
Used under formula, compared with the anti-eccentric wear submersible motor of radial positioning is carried out using rolling bearing, without complicated sealing structure
To being sealed at bearing, simple structure, particularly suitable water cooled machine is used.The present invention has simple structure, can ensure rotating shaft footpath
To the advantage of positioning, it is ensured that rotor is concentric with stator, can be horizontal or make under having the use condition at certain angle of inclination
With, the use scope of submersible motor is expanded, reduce the limitation to submersible motor occupation mode.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is the structure chart of thrust disc in Fig. 1；
Fig. 3 is the structural representation of taper tubular thrust bearing in Fig. 1；
Fig. 4 is the top view of Fig. 3；
Fig. 5 is the structure chart of the second outer bearing carrier；
Fig. 6 is the structure chart of common submersible motor；
In figure：1- bases, 2- pressure regulation membrane covers, 3- pressure regulator membranes, 4- shells, 5- rotors, 6- stators, the anti-eccentric wear machines of 7- second
Structure, 8- thrust discs, 9- taper tubular thrust bearings, 10- rotating shafts, 11- screws, the anti-eccentric wear mechanisms of 12- first, 13- guide bearings,
14- oil sealings, 15- retainer nut, 16- inner card cages, 17- boss, 18- deep gouges, 19- through holes, 20- taper annular grooves, 21- fastening spiral shells
Bolt, the outer bearing carriers of 101- first, the inner pedestals of 102- first, the inner pedestals of 103- second, the outer bearing carriers of 104- second, 90- is opened
Mouth groove.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
A kind of anti-eccentric wear submersible motor as Figure 1-5, including base 1, pressure regulation membrane cover 2, pressure regulator membrane 3, shell 4, turn
Son 5, stator 6 and rotating shaft 10, the two ends of the rotating shaft 10 are equipped with one group of anti-eccentric wear bearing arrangement, the respectively first anti-eccentric wear bearing
The anti-eccentric wear bearing arrangement 7 of structure 12 and second, the first anti-eccentric wear bearing arrangement 12 includes being sleeved on the upper end of rotating shaft 10
Thrust disc 8, taper tubular thrust bearing 9, the first outer bearing carrier 101 and the first inner pedestal 102, the second anti-eccentric wear bearing
Structure 7 includes being sleeved on thrust disc 8, taper tubular thrust bearing 9 and second inner pedestal 103 and second of the bottom of rotating shaft 10
Outer bearing carrier 104, the thrust disc 8 includes a trapezoidal revolving body, the upper and lower surface of thrust disc 8 is formed circular conical surface, the cone
The structure of shape tubular thrust bearing 9 is the taper tubular formed from water lubricating bearing material, 9 points of the taper tubular thrust bearing
Not with thrust disc 8, the first outer bearing carrier 101, the first inner pedestal 102, the second inner pedestal 103 and the second outer bearing carrier 104
It is cone match, above-mentioned first outer bearing carrier 101, the first inner pedestal 102, the second inner pedestal 103 and the second outer bearing carrier
104 are fixed on shell 4 by connector.
First outer bearing carrier 101, the first inner pedestal 102, the second inner pedestal 103 and the second outer bearing carrier 104
The taper concave surface coordinated with taper tubular thrust bearing 9 is equipped with, the taper tubular thrust bearing 9 is fixed on taper concave surface
It is interior, oil sealing 14 is provided between the mating surface of first outer bearing carrier 101 and rotating shaft 10 as seal, first inner pedestal
102 is identical with the structure of the second inner pedestal 103, is equipped with the cylinder with the cooperation of rotating shaft 10 and is set between cylinder and rotating shaft
There is guide bearing 13, the middle part inboard of second outer bearing carrier 104 is provided with deep gouge 18, outside and is provided with and the middle part fastening bolt of base 1
21 deep-slotted chip breakers for coordinating, the deep gouge 18 is used to accommodate the end of rotating shaft 10.Taper tubular thrust bearing 9 is bored with thrust disc 8 respectively
Shape coordinates, and countershaft 10 applies also to give the radial load that axle center is pointed in rotating shaft 10 while axial reaction force, makes rotating shaft 10 more
It is easy to centering, it is ensured that radial positioning of the rotating shaft 10 in the case where there is responsive to axial force.
For the ease of maintenance, handling, the taper tubular thrust bearing 9 is separately fixed at the first outer shaft by screw 11
In bearing 101, the first inner pedestal 102, the second inner pedestal 103 and the second outer bearing carrier 104, the thrust disc 8 and rotating shaft
10 by key connecting, and the outer surface of thrust disc 8 being rotatably assorted with taper tubular thrust bearing 9 has wearing layer, the wearing layer
The high-abrasive material of the classes of 3C,r13 mono- is can select, thrust disc 8 integrally can also be made using 3Cr13 materials.Taper tubular thrust bearing
9 select water lubricating bearing material, and what water lubricating bearing material was commonly used has polytetrafluoroethylene (PTFE), carbon graphite, acid bronze alloy etc..Conically shaped
Density is low, linear expansion coefficient is small because it has for the preferred carbon graphite material of shape thrust bearing 9, self-lubricating, corrosion-resistant, resistant to elevated temperatures
Advantage, and wearing layer selects 3Cr13 materials because with excellent decay resistance, intensity and wearability higher, it is made
Into thrust disc 8 taper tubular thrust bearing 9 can be coordinated to use water as lubricant medium, reduce the temperature of rotating shaft 10, extend it
Service life.
In order to the thrust disc 8 for preventing the anti-eccentric wear bearing arrangement 7 of thrust disc 8 and second of the first anti-eccentric wear bearing arrangement 12 is sent out
Raw axial displacement, sets retainer nut 15 and rotating shaft 10 between the thrust disc 8 and oil sealing 14 of the first anti-eccentric wear bearing arrangement 12
Coordinate, while the end face of thrust disc 8 of the bottom shaft shoulder of rotating shaft 10 and the second anti-eccentric wear bearing arrangement 7 is coordinated, to the first anti-eccentric wear
The thrust disc 8 of the anti-eccentric wear bearing arrangement 7 of thrust disc 8 and second of bearing arrangement 12 carries out axial limiting.
Taper annular groove 20, taper are equipped with the taper concave surface of the outer bearing carrier 104 of first outer bearing carrier 101 and second
Tubular thrust bearing 9 is arranged on the radial positioning that the interior energy of taper annular groove 20 better ensures that rotating shaft 10；Second outer bearing carrier
104 bottom is provided with annular boss 17 and its bottom of deep gouge 18 is provided with through hole 19, and the middle part inboard of the base 1 is provided with and boss
The 17 annular inner card cages 16 for coordinating, the fastening bolt 21 coordinates with the screwed hole of the bottom centre of inner card cage 16, by boss 17
Can ensure the steadiness of the second outer bearing carrier 104 with the cooperation of inner card cage 16, through hole 19 be conducive to current enter thrust disc 8 with
Between taper tubular thrust bearing 9, lubricant medium is used water as.
Used as a kind of preferred structure, the barrel of the taper tubular thrust bearing 9 is laid with open slot along generatrix direction
90 and open slot 90 towards taper tubular thrust bearing 9 miner diameter end, the screw 11 run through taper tubular thrust bearing 9
Position is arranged at open slot 9, and reserved open slot 90 is conducive to current to enter between thrust disc 8 and taper tubular thrust bearing 9, profit
With water as lubricant medium.Using the submersible motor of this anti-eccentric wear bearing arrangement, radial positioning is carried out with using rolling bearing
Anti- eccentric wear submersible motor compare, without complicated sealing structure to being sealed at bearing, simple structure, particularly suitable water-cooled
Motor is used.
When submersible motor is horizontal to be used, two groups of anti-eccentric wear bearing arrangements are separately mounted to the two ends of rotating shaft 10, can be by
Cone match with good guidance between thrust disc 8 and taper tubular thrust bearing 9, taper thrust disc 8 and taper tubular stop
Thrust bearing 9 is mutually compressed, and rotating shaft 10 is easy to centering in the presence of external force, it is ensured that motor internal rotor footpath in use
To non-displacement, it is ensured that rotor is concentric with stator；Taper tubular thrust bearing 9 is selected from carbon graphite material, thrust disc 8
3Cr13 materials, both of which can be used under water lubrication form, simplify bearing arrangement, expand the use scope of submersible motor.
In sum, anti-eccentric wear bearing arrangement of the invention has simple structure, rotating shaft can be ensured without the excellent of radial deflection
Point, also ensure that the radial positioning at rotating shaft two ends, using the anti-eccentric wear of the anti-eccentric wear bearing arrangement while axial force is carried
Submersible motor can prevent eccentric wear phenomenon in motor internal rotor from producing, and carry axial force and ensure that rotor is concentric with stator, energy
Horizontal or use under having the use condition at certain angle of inclination, the limitation to submersible motor occupation mode is reduced.
Claims (7)
1. a kind of anti-eccentric wear submersible motor, it is characterised in that：Including base（1）, pressure regulation membrane cover（2）, pressure regulator membrane（3）, shell
（4）, rotor（5）, stator（6）And rotating shaft（10）, it is characterised in that：The rotating shaft（10）Two ends are equipped with one group of anti-eccentric wear bearing
Structure, the respectively first anti-eccentric wear bearing arrangement（12）With the second anti-eccentric wear bearing arrangement（7）, the first anti-eccentric wear bearing knot
Structure（12）Including being sleeved on rotating shaft（10）The thrust disc of upper end（8）, taper tubular thrust bearing（9）, the first outer bearing carrier
（101）With the first inner pedestal（102）, the second anti-eccentric wear bearing arrangement（7）Including being sleeved on rotating shaft（10）Bottom
Thrust disc（8）, taper tubular thrust bearing（9）With the second inner pedestal（103）And second outer bearing carrier（104）, the thrust
Disk（8）Including a trapezoidal revolving body, make thrust disc（8）Upper and lower surface forms circular conical surface, the taper tubular thrust bearing（9）
Structure is the taper tubular formed from water lubricating bearing material, the taper tubular thrust bearing（9）Respectively with thrust disc
（8）, the first outer bearing carrier（101）, the first inner pedestal（102）, the second inner pedestal（103）And second outer bearing carrier（104）
It is cone match.
2. the anti-eccentric wear submersible motor according to claim 1, it is characterised in that：First outer bearing carrier（101）,
One inner pedestal（102）, the second inner pedestal（103）And second outer bearing carrier（104）It is equipped with and taper tubular thrust bearing
（9）The taper concave surface of cooperation, the taper tubular thrust bearing（9）It is fixed in taper concave surface, first outer bearing carrier
（101）With rotating shaft（10）Mating surface between be provided with seal, first inner pedestal（102）With the second inner pedestal（103）
Structure it is identical, be equipped with and rotating shaft（10）Guide bearing is provided between the cylinder and cylinder of cooperation and rotating shaft (10)（13）, it is described
Second outer bearing carrier（104）Middle part inboard is provided with deep gouge (18), outside and is provided with and base（1）Middle part fastening bolt（21）Coordinate
Deep-slotted chip breaker, the deep gouge (18) is for accommodating rotating shaft（10）End.
3. the anti-eccentric wear submersible motor according to claim 2, it is characterised in that：The taper tubular thrust bearing（9）
By screw（11）It is separately fixed at the first outer bearing carrier（101）, the first inner pedestal（102）, the second inner pedestal（103）And
Second outer bearing carrier（104）It is interior, the thrust disc（8）With rotating shaft（10）By key connecting, with taper tubular thrust bearing（9）Turn
The dynamic thrust disc for coordinating（8）Outer surface has wearing layer, and the wearing layer selects high-abrasive material, and the high-abrasive material is 3Cr13.
4. the anti-eccentric wear submersible motor according to claim 3, it is characterised in that：The water lubricating bearing material is carbon stone
Ink material, the thrust disc（8）Generally 3Cr13 materials, the seal is oil sealing（14）.
5. anti-eccentric wear submersible motor according to claim 4, it is characterised in that：The taper tubular thrust bearing（9）'s
Barrel is laid with open slot along generatrix direction（90）And open slot（90）Towards taper tubular thrust bearing（9）Miner diameter end,
The screw（11）Through taper tubular thrust bearing（9）Position is arranged on open slot（90）Place.
6. anti-eccentric wear submersible motor according to claim 5, it is characterised in that：The first anti-eccentric wear bearing arrangement（12）
Thrust disc（8）With oil sealing（14）Between be provided with and rotating shaft（10）The retainer nut of cooperation（15）, the rotating shaft（10）Bottom axle
Shoulder and the second anti-eccentric wear bearing arrangement（7）Thrust disc（8）End face coordinates.
7. the anti-eccentric wear submersible motor according to claim 6, it is characterised in that：First outer bearing carrier（101）With
Two outer bearing carriers（104）Taper concave surface on be equipped with taper annular groove（20）, second outer bearing carrier（104）Bottom be provided with
Annular boss（17）And its deep gouge (18) bottom is provided with through hole（19）, the base（1）Middle part inboard is provided with and boss（17）Match somebody with somebody
The annular inner card cage of conjunction（16）, the fastening bolt（21）With inner card cage（16）The screwed hole of bottom centre coordinates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510247854.4A CN104836366B (en) | 2015-05-15 | 2015-05-15 | Anti- eccentric wear submersible motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510247854.4A CN104836366B (en) | 2015-05-15 | 2015-05-15 | Anti- eccentric wear submersible motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104836366A CN104836366A (en) | 2015-08-12 |
| CN104836366B true CN104836366B (en) | 2017-07-04 |
Family
ID=53814056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510247854.4A Expired - Fee Related CN104836366B (en) | 2015-05-15 | 2015-05-15 | Anti- eccentric wear submersible motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104836366B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286267B (en) * | 2018-12-11 | 2024-06-21 | 广东瑞荣泵业有限公司 | Screw thread connection water filling type submersible motor for well |
| CN111600418B (en) * | 2020-05-19 | 2022-09-09 | 珠海天骋科技有限公司 | Series excited motor |
| CN116388443B (en) * | 2023-06-05 | 2023-08-29 | 深圳市恒然电机有限公司 | Anti-eccentric-wear brushless submersible motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0954706B1 (en) * | 1997-01-29 | 2005-03-23 | William F. Hackett, Jr. | Thrust bearing assembly |
| CN201475178U (en) * | 2009-03-30 | 2010-05-19 | 郑州大学 | Dismountable guide bearing |
| CN202001325U (en) * | 2010-11-12 | 2011-10-05 | 无锡市锡泵制造有限公司 | Bidirectional submersible axial-flow pump |
| CN204597689U (en) * | 2015-05-15 | 2015-08-26 | 河北虹银泵业股份有限公司 | Anti-eccentric wear submersible motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8894350B2 (en) * | 2010-11-02 | 2014-11-25 | Baker Hughes Incorporated | Reduced profile abrasion resistant pump thrust bearing |
-
2015
- 2015-05-15 CN CN201510247854.4A patent/CN104836366B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0954706B1 (en) * | 1997-01-29 | 2005-03-23 | William F. Hackett, Jr. | Thrust bearing assembly |
| CN201475178U (en) * | 2009-03-30 | 2010-05-19 | 郑州大学 | Dismountable guide bearing |
| CN202001325U (en) * | 2010-11-12 | 2011-10-05 | 无锡市锡泵制造有限公司 | Bidirectional submersible axial-flow pump |
| CN204597689U (en) * | 2015-05-15 | 2015-08-26 | 河北虹银泵业股份有限公司 | Anti-eccentric wear submersible motor |
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|---|---|
| CN104836366A (en) | 2015-08-12 |
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