CN205960850U - Motor prevents structure of shaft current damage bearing - Google Patents

Motor prevents structure of shaft current damage bearing Download PDF

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Publication number
CN205960850U
CN205960850U CN201620979012.8U CN201620979012U CN205960850U CN 205960850 U CN205960850 U CN 205960850U CN 201620979012 U CN201620979012 U CN 201620979012U CN 205960850 U CN205960850 U CN 205960850U
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CN
China
Prior art keywords
bearing
cover
housing
motor end
bearing holder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201620979012.8U
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Chinese (zh)
Inventor
胡精华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangxi Datang International Fuzhou Power Generation Co Ltd
Original Assignee
Jiangxi Datang International Fuzhou Power Generation Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangxi Datang International Fuzhou Power Generation Co Ltd filed Critical Jiangxi Datang International Fuzhou Power Generation Co Ltd
Priority to CN201620979012.8U priority Critical patent/CN205960850U/en
Application granted granted Critical
Publication of CN205960850U publication Critical patent/CN205960850U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model relates to a motor prevents structure of shaft current damage bearing, including the axis of rotation, the motor end cover is established to the cover in the outside of axis of rotation, the outside cover of axis of rotation is equipped with the bearing, the outside of bearing is equipped with the bearing housing, the bearing housing includes axial adapter sleeve and radial flange, the axial is connected the ways and is established the outside at the bearing, radial flange is located one side of motor end cover, be equipped with the connecting hole of mutual correspondence on the radial flange of bearing housing and the motor end cover, radial flange and motor end cover are through wearing to establish the bolted connection in the connecting hole, it establishes insulating pad of bolt in the bolt outside to be equipped with the cover in the connecting hole of radial flange, be equipped with the bearing housing dead ring between radial flange and the motor end cover, be equipped with the bearing housing insulating layer between axial adapter sleeve and the motor end cover, the bolt fills up through being insulating, bearing housing dead ring and bearing housing insulating layer effectively cut off current path, prevent the damage of shaft current to the bearing.

Description

A kind of motor prevents shaft current from damaging the structure of bearing
Technical field
This utility model is related to a kind of motor prevents shaft current from damaging the structure of bearing.
Background technology
The serum recycle pump motor of many thermal power generation corporations or through the improved motor of VFC occurred because Shaft current causes the accident of bearing frequent breakage, and therefore class fault is not common, and Some Enterprises a period of time when searching problem is difficult to standard Really failure judgement reason, and the damage to bearing for the shaft current, often the time is short, and bearing changes bad repeatly repeatly, causes larger to enterprise Material resources and the loss of manpower.Shaft current damages the fault performance of bearing.General bearing slideway has perpendicular to glide direction, uniformly close Collection is distributed, is in washboard crapyness scar, and the formation of this scar progressively aggravates with run time, only needs a few hours to make when serious Become the damage of bearing, vibrate big, abnormal sound in motor operation and substantially show, and the depth of scar, largely it is decided by shaft current Size.
Shaft current damages the mechanism of bearing:When shaft current flows through bearing roller with slideway, electric arc is produced on slideway and burns Wound, forms metal bump, and this projection is standing after rolling element rolls, to put down auxiliary formation washboard sample fold, motor to slideway both sides Run time is longer, and fold is more obvious, and electric current is bigger, and fold is deeper.
The formation of shaft current:The generation of general motor shaft current, occurs mainly on large-size machine.The formation of shaft current, Premise is that have shaft voltage(Produced voltage between motor two bearings or machine shaft and bearing)Exist and reach certain value, be sufficient to Puncture oil film in bearing slideway, thus forming shaft current.When shaft current is higher, bearing is produced and destroy.In motor, axle Voltage is generally existing, and the main cause that it produces has following several, and it is different to be different from Crack cause, the journey to bearing failure Degree is different:
1. electromagnetic reason produces shaft voltage:
(1)Electric machine structure technique produces shaft voltage
The rotor of motor is in the magnetic field of alternation, is affected by stator core, rotor processing technology, this alternating magnetic field is simultaneously Uneven, a shaft voltage vertically is produced on the rotor rotate cutting.Under normal circumstances, motor shaft voltage is not Height, does not become injury to bearing, but in particular cases, such as motor stator, rotor magnetic circuit structural can raise after being damaged.
(2)Supply harmonic component produces shaft voltage
This kind of situation mostly occurs in motor through, in Frequency Converter Control, converter out-put supply is the pulse power, stator winding End turn, connection part, producing electromagnetic induction between rotating shaft, so that the electromotive force in rotating shaft is changed thus producing axle electricity Pressure raises.After carrying out VFC transformation, motor occurs that the fault damaging bearing because of shaft current occurs to some equipment.
2. external power source intervention produces shaft voltage:
(1)System process reason axle electrostatic pressure
During the motor drag pump housing, pusher side pump housing blade and fluid high-speed friction, the such as dry saturated steam of Turbo-generator Set and vapour The friction of turbine blade phase produces electrostatic charge, makes to produce axle electrostatic pressure between generator amature and shell.
In fluid system, when fluid has electric charge in itself, battery effect between fluid and pipeline, container, will be produced.As In desulfurization system for thermal power plant slurry circulating pump, because of chemistry reflection, serosity creates charged ion, just to the serosity in absorption tower It is a fluid system typically with battery effect.Pump impeller and big axle with the pump housing of serosity directly contact(Including with its The motor shaft connecting)Be equivalent to a pole of battery, and the shell on absorption tower, pipeline are another pole.Under normal circumstances, outside absorption tower Shell reliable ground, but if pipeline ground connection is unreliable or unearthed, is then grounded outward in pump housing bearing, the inner ring of motor bearings with it Axle electrostatic pressure is produced between shell phase bearing outer ring even.
(2)External power source intervention produces shaft voltage
As electric motor temp line, motor heater power lead insulation damages, energized conductor contact rotor generation shaft voltage, pipeline Upper welding procedure mistake produces shaft voltage on motor.
3. other reasons.Chat in synthesis, the producing cause of motor shaft voltage is more, prevention is relatively difficult, and axle to be solved Circuit damage motor bearings fault, the circulation path of cut-out shaft current, immediately possible.
Utility model content
The purpose of this utility model is to solve the existing defect of motor shaft voltage prevention in prior art, providing one Planting motor prevents shaft current from damaging the structure of bearing.
To achieve these goals, the technical solution adopted in the utility model is:
A kind of motor prevents shaft current from damaging the structure of bearing, including rotary shaft, in the sheathed motor in the outside of rotary shaft End cap, electric motor end cap connects motor housing, and the outside of rotary shaft is arranged with bearing, and the outside of bearing is provided with bearing holder (housing, cover), described axle Bearing sleeve includes axial adapter sleeve and radial flange, and axial adapter sleeve is set in the outside of bearing, and radial flange is located at described electricity The side of generator terminal lid, the radial flange of bearing holder (housing, cover) and electric motor end cap are provided with mutually corresponding connecting hole, radial flange and electricity Generator terminal lid passes through to be located in the bolt connection connecting in the hole, and the connection in the hole of radial flange is provided with the bolt being set in outside bolt Felt pad, is provided with bearing holder (housing, cover) dead ring, is provided with axle between axial adapter sleeve and electric motor end cap between radial flange and electric motor end cap Bearing sleeve insulating barrier.
A kind of above-mentioned motor prevents shaft current from damaging the structure of bearing, is provided with position between described rotary shaft and bearing holder (housing, cover) In the interior oil cap inside described electric motor end cap and be located at described electric motor end cap outside outer oil cap.
A kind of above-mentioned motor prevents shaft current from damaging the structure of bearing, described bolt felt pad, bearing holder (housing, cover) dead ring And the material of bearing holder (housing, cover) insulating barrier is common epoxy plate.
A kind of above-mentioned motor prevents shaft current from damaging the structure of bearing, the outer wall of the axial adapter sleeve of described bearing holder (housing, cover) It is provided with resettlement groove, bearing holder (housing, cover) insulating barrier is embedded in resettlement groove by heat treatment.
A kind of above-mentioned motor prevents shaft current from damaging the structure of bearing, described bolt felt pad, bearing holder (housing, cover) dead ring And bearing holder (housing, cover) insulating barrier is integrally formed.
The beneficial effects of the utility model are:The shaft voltage producing for external power source intervention, shaft current path will be distinguished Motor bearings at both ends circulates, then needs, at motor two ends, motor bearings insulation sleeve is installed, the bearing holder (housing, cover) of this structure includes axle To adapter sleeve and radial flange, axial adapter sleeve is set in the outside of bearing, and radial flange is located at the side of electric motor end cap, axle The radial flange of bearing sleeve and electric motor end cap are provided with mutually corresponding connecting hole, and radial flange and electric motor end cap pass through to be located in Connect the bolt connection of in the hole, the connection in the hole of radial flange is provided with and is set in bolt felt pad outside bolt it is therefore an objective to make Electric motor end cap keeps insulation with bearing holder (housing, cover), does not become path by bolt shape, is provided with bearing holder (housing, cover) between radial flange and electric motor end cap Dead ring, makes electric motor end cap and the radial flange of bearing holder (housing, cover) keep insulation, does not close face by vertical junction and form path, axially connect It is provided with bearing holder (housing, cover) insulating barrier between set and electric motor end cap, make electric motor end cap and the axial adapter sleeve of bearing holder (housing, cover) keep insulation, obstructed The horizontal integration face of mistake forms path, effectively cuts off electric current by bolt felt pad, bearing holder (housing, cover) dead ring and bearing holder (housing, cover) insulating barrier Path, prevents the damage to bearing for the shaft current.
Brief description
Fig. 1 is schematic diagram of the present utility model.
Specific embodiment
As shown in figure 1, a kind of motor prevents shaft current from damaging the structure of bearing, including rotary shaft 1, in rotary shaft 1 The sheathed electric motor end cap 2 in outside, electric motor end cap 2 connects motor housing 3, and the outside of rotary shaft 1 is arranged with bearing 4, the outside of bearing 4 It is provided with bearing holder (housing, cover), bearing holder (housing, cover) includes axial adapter sleeve 5 and radial flange 6, axial adapter sleeve 5 is set in the outside of bearing 4, footpath It is located at the side of electric motor end cap 2 to flange 6, the radial flange 6 of bearing holder (housing, cover) and electric motor end cap 2 are provided with mutually corresponding connection The bolt 7 that hole, radial flange 6 and electric motor end cap 2 pass through to be located in connection in the hole connects, and the connection in the hole of radial flange 6 is provided with It is set in the bolt felt pad 8 in bolt 7 outside, be provided with bearing holder (housing, cover) dead ring 9 between radial flange 6 and electric motor end cap 2, axially connect It is provided with bearing holder (housing, cover) insulating barrier 10 between female connector 5 and electric motor end cap 2.
It is provided with the interior oil cap 11 positioned at electric motor end cap 2 inner side between rotary shaft 1 and bearing holder (housing, cover) and be located at outside electric motor end cap 2 The outer oil cap 12 of side.
In this utility model, bolt felt pad 8, bearing holder (housing, cover) dead ring 9 and bearing holder (housing, cover) insulating barrier 10 are integrally formed, and Material is common epoxy plate, and the outer wall of the axial adapter sleeve 5 of bearing holder (housing, cover) is provided with resettlement groove, bearing holder (housing, cover) insulating barrier 10 by heat at Reason is embedded in resettlement groove, in case changing motor each part package size.
The shaft voltage producing for external power source intervention, will circulate respectively in motor bearings at both ends in shaft current path, then Need, at motor two ends, motor bearings insulation sleeve is installed, the bearing holder (housing, cover) of this structure includes axial adapter sleeve 5 and radial flange 6, Axial adapter sleeve 5 is set in the outside of bearing 4, and radial flange 6 is located at the side of electric motor end cap 2, the radial flange 6 of bearing holder (housing, cover) with And electric motor end cap 2 is provided with mutually corresponding connecting hole, radial flange 6 and electric motor end cap 2 pass through to be located in the spiral shell connecting in the hole Bolt 7 connects, and the connection in the hole of radial flange 6 is provided with the bolt felt pad 8 being set in bolt 7 outside it is therefore an objective to make electric motor end cap 2 Keep insulation with bearing holder (housing, cover), path is not become by bolt shape, between radial flange 6 and electric motor end cap 2, be provided with bearing holder (housing, cover) dead ring 9, make electric motor end cap 2 and the radial flange 6 of bearing holder (housing, cover) keep insulation, face is not closed by vertical junction and form path, axial adapter sleeve 5 It is provided with bearing holder (housing, cover) insulating barrier 10 and electric motor end cap 2 between, make electric motor end cap 2 and the axial adapter sleeve 5 of bearing holder (housing, cover) keep insulation, no Path is formed by horizontal integration face, is effectively cut by bolt felt pad 8, bearing holder (housing, cover) dead ring 9 and bearing holder (housing, cover) insulating barrier 10 Power-off flow path, prevents the damage to bearing for the shaft current.
The foregoing is only preferred embodiment of the present utility model, and limit this utility model never in any form, For a person skilled in the art, this utility model can have various modifications and variations.All in spirit of the present utility model Within principle, any modification, equivalent substitution and improvement made etc., should be included within protection domain of the present utility model.

Claims (5)

1. a kind of motor prevents shaft current from damaging the structure of bearing, including rotary shaft, in the sheathed motor side in the outside of rotary shaft Lid, electric motor end cap connects motor housing, and the outside of rotary shaft is arranged with bearing, and the outside of bearing is provided with bearing holder (housing, cover), and its feature exists In described bearing holder (housing, cover) includes axial adapter sleeve and radial flange, and axial adapter sleeve is set in the outside of bearing, radial flange position In the side of described electric motor end cap, the radial flange of bearing holder (housing, cover) and electric motor end cap are provided with mutually corresponding connecting hole, radially Flange and electric motor end cap pass through to be located in the bolt connection connecting in the hole, and the connection in the hole of radial flange is provided with and is set in outside bolt The bolt felt pad of side, is provided with bearing holder (housing, cover) dead ring between radial flange and electric motor end cap, axial adapter sleeve and electric motor end cap it Between be provided with bearing holder (housing, cover) insulating barrier.
2. a kind of motor according to claim 1 prevents shaft current from damaging the structure of bearing it is characterised in that described turn It is provided between moving axis and bearing holder (housing, cover) positioned at the interior oil cap inside described electric motor end cap and be located at outer outside described electric motor end cap Oil cap.
3. a kind of motor according to claim 1 prevents shaft current from damaging the structure of bearing it is characterised in that described spiral shell The material of bolt felt pad, bearing holder (housing, cover) dead ring and bearing holder (housing, cover) insulating barrier is common epoxy plate.
4. a kind of motor according to claim 1 prevents shaft current from damaging the structure of bearing it is characterised in that described axle The outer wall of the axial adapter sleeve of bearing sleeve is provided with resettlement groove, and bearing holder (housing, cover) insulating barrier is embedded in resettlement groove by heat treatment.
5. a kind of motor according to claim 2 prevents shaft current from damaging the structure of bearing it is characterised in that described spiral shell Bolt felt pad, bearing holder (housing, cover) dead ring and bearing holder (housing, cover) insulating barrier are integrally formed.
CN201620979012.8U 2016-08-30 2016-08-30 Motor prevents structure of shaft current damage bearing Expired - Fee Related CN205960850U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620979012.8U CN205960850U (en) 2016-08-30 2016-08-30 Motor prevents structure of shaft current damage bearing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620979012.8U CN205960850U (en) 2016-08-30 2016-08-30 Motor prevents structure of shaft current damage bearing

Publications (1)

Publication Number Publication Date
CN205960850U true CN205960850U (en) 2017-02-15

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ID=57978338

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201620979012.8U Expired - Fee Related CN205960850U (en) 2016-08-30 2016-08-30 Motor prevents structure of shaft current damage bearing

Country Status (1)

Country Link
CN (1) CN205960850U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111917220A (en) * 2020-08-10 2020-11-10 淄博智科电气科技有限公司 End cover insulation device of permanent magnet synchronous motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111917220A (en) * 2020-08-10 2020-11-10 淄博智科电气科技有限公司 End cover insulation device of permanent magnet synchronous motor
CN111917220B (en) * 2020-08-10 2022-06-24 淄博智科电气科技有限公司 End cover insulation device of permanent magnet synchronous motor

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20170215

CF01 Termination of patent right due to non-payment of annual fee