NL2029683B1 - On-line maintainable shaft grounding ring - Google Patents

On-line maintainable shaft grounding ring Download PDF

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Publication number
NL2029683B1
NL2029683B1 NL2029683A NL2029683A NL2029683B1 NL 2029683 B1 NL2029683 B1 NL 2029683B1 NL 2029683 A NL2029683 A NL 2029683A NL 2029683 A NL2029683 A NL 2029683A NL 2029683 B1 NL2029683 B1 NL 2029683B1
Authority
NL
Netherlands
Prior art keywords
conductive ring
end cover
flexible
ring base
shaft grounding
Prior art date
Application number
NL2029683A
Other languages
Dutch (nl)
Inventor
Yang Fazhan
Li Jianyong
Lv Jie
Guo Shiyong
Chen Shaojie
Li Ming
Zhang Weishan
Zhang Jianjun
Original Assignee
Univ Shandong Science & Tech
Qingdao Borui Sealing Tech Co Ltd
Univ Qingdao Technology
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 Univ Shandong Science & Tech, Qingdao Borui Sealing Tech Co Ltd, Univ Qingdao Technology filed Critical Univ Shandong Science & Tech
Priority to NL2029683A priority Critical patent/NL2029683B1/en
Application granted granted Critical
Publication of NL2029683B1 publication Critical patent/NL2029683B1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/08—Slip-rings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The present invention discloses an on—line maintainable shaft grounding ring, and belongs to the field of mechanical equipment parts. The shaft grounding ring includes a conductive ring and a flexible conductor. The conductive ring includes a conductive ring 5 base and an end cover. At least two grooves are provided on the conductive ring base. The flexible conductor is fixed in the grooves through the end cover. The flexible conductor includes a fixing portion and a flexible portion. The flexible portion includes a plurality of flexible fibre segments. The flexible lO fibre segments are wrapped into the flexible portion through the fixing portion. The on—line maintainable shaft grounding ring of the present invention may replace a commonly used carbon brush device at present, is simple and convenient to maintain and stable in performance, and may effectively ground a shaft current. 15 (+ Fig. l)

Description

P783/NLpd
ON-LINE MAINTAINABLE SHAFT GROUNDING RING
TECHNICAL FIELD
The present invention relates to the field of mechanical equipment parts, and in particular, to an on-line maintainable shaft grounding ring.
BACKGROUND ART
With the increase of energy cost, an energy saving technology has gradually become the focus of industrial attention. A motor variable frequency technology, as an effective way to reduce ener- gy consumption, has been gradually recognized and promoted. The variable frequency technology adopts an alternating current oper- ated by a variable frequency driver (VFD) to control a motor speed by using pulse width modulation (PWM). At this moment, a vector sum of a three-phase output voltage is not zero, which means that a common-mode voltage will be generated on a motor shaft by capac- itive sensing. The motor shaft, a motor housing, and motor bear- ings form an electrical loop to generate a shaft current, which causes electrical discharge machining (EDM) pits, electrical cor- rosion spots and groove damage. Alternating current and direct current motor bearings of all frequency converters are likely to produce this fault regardless of a motor body size or a power lev- el. Electrical corrosion has become the main cause of motor bear- ing failure, and is not easy to be detected in the early stage, thereby gradually causing motor vibration and noise increase to ultimately lead to unexpected shutdown. A common solution is to use a carbon brush to keep contact with the motor shaft, or use an insulated bearing for a motor. The carbon brush may be worn in this solution. The worn powder will seriously affect the protec- tion requirements and safety of the motor, and the carbon brush needs to be regularly maintained and replaced. If the carbon brush has a mechanical fault, a high frequency shaft current will damage the bearing in a very short time. An insulated bearing is also used in some solutions, and the disadvantages are that the insu-
lated bearing is expensive and often unable to meet the require- ments of equipment working conditions in terms of mechanical per- formance. Even if the insulated bearing may avoid the motor from electrical corrosion, the lack of protection of driving equipment thereof leads to unstable operation of key associated equipment and even causes unexpected shutdown accidents. At this moment, the energy consumption cost saved by the variable frequency technology cannot make up for production and safety losses.
SUMMARY
An object of the present invention is to solve the problems existing in the conventional art and to provide an on-line main- tainable shaft grounding ring, including: a conductive ring and a flexible conductor. The conductive ring includes a conductive ring base and an end cover. At least two grooves are provided on the conductive ring base. The flexible conductor is fixed in the grooves through the end cover.
As a further optimization of the technical solution of the present invention, the flexible conductor includes a fixing por- tion and a flexible portion, the flexible portion includes a plu- rality of flexible fibre segments, and the flexible fibre segments are wrapped into the flexible portion through the fixing portion.
As a further optimization of the technical solution of the present invention, the grooves are arranged along the centre cir- cumference of the conductive ring base, one side of the grooves near the centre of the conductive ring base is provided with a stop, the fixing portion is clamped in the grooves through the stop, the flexible portion extends out of the stop, and an inner diameter of the end cover is arranged towards the centre of the conductive ring base.
As a further optimization of the technical solution of the present invention, the end cover is annular, an outer diameter of the end cover is smaller than an outer diameter of the conductive ring base, and an inner diameter of the end cover is smaller than an inner diameter of the conductive ring base.
As a further optimization of the technical solution of the present invention, the conductive ring base, the end cover, and the fixing portion are all made of brass.
As a further optimization of the technical solution of the present invention, the conductive ring base is further provided with at least three through holes outside an outer diameter of the end cover, and the through holes are arranged along the central circumference of the conductive ring base.
Beneficial effects of the present invention are as follows.
The on-line maintainable shaft grounding ring of the present invention may replace a commonly used carbon brush device at pre- sent, is simple to maintain and stable in performance, and may ef- fectively ground a shaft current through a flexible conductor, a conductive ring, a motor end cover, and a motor grounding device especially due to the fact that hundreds of thousands to millions of flexible conductive fibres are always in contact with a shaft in the aspect of coping with a high-frequency shaft voltage. The working life may reach 100,000 hours. If a conventional bearing is used instead of an insulated bearing, while the cost is reduced, the mechanical performance of an equipment bearing may be maxim- ized, the working life of equipment may be prolonged, and a bear- ing of motor-driven equipment may be protected from electrical corrosion. The device of the present invention is rapid in produc- tion assembly, low in production cost, and convenient in use, has improved equipment stability and excellent wear resistance of flexible conductive fibre clusters, has a wide range of tempera- ture and humidity applications, has a long service life, and does not generate contaminants such as powder. In addition, when the flexible conductor is damaged and needs to be replaced, the end cover may be directly removed, the flexible conductor in the grooves may be taken out and replaced, and then the end cover may be fixed. Therefore, the shaft grounding ring is repaired and maintained simply and rapidly, and the production efficiency is effectively ensured.
BRIEFT DESCRIPTION OF THE DRAWINGS
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, a brief description will be given below with reference to the accompanying drawings which are required to be used in the embodiments. It is obvious that the drawings in the following description are only some em- bodiments of the present invention, and it would have been obvious for a person of ordinary skill in the art to obtain other drawings according to these drawings without involving any inventive ef- fort.
FIG. 1 is a schematic structure view of Embodiment 1 of the present invention.
FIG. 2 is a rear view of a structure view of Embodiment 1 of the present invention.
FIG. 3 is a cross-sectional view at A-A in FIG. 2.
FIG. 4 is an enlarged detail view at B in FIG. 3.
FIG. 5 is a schematic structure view of Embodiment 2 of the present invention.
FIG. 6 is a use state view of a structure of the present in- vention.
Reference Numerals: 10-Conductive ring; 11-conductive ring base; 111-groove; 112- end cover groove; 113-stop; 114-through hole; 12-end cover; 20- flexible conductor; 21-fixing portion; 22-flexible portion; 30- hexagon socket countersunk head screw; 40-motor; 4l-output shaft; 42-motor housing; 43-ground cable.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The technical solutions in the embodiments of the present in- vention will now be described clearly and completely in conjunc- tion with the accompanying drawings in the embodiments of the pre- sent invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
It should be noted that all directivity indications (such as up, down, left, right, front, and rear.) in the embodiments of the present invention are only used to explain a relative positional relationship, motion, etc. between components at a particular at- titude (as shown in the drawings), and if the particular attitude is changed, the directivity indication is changed accordingly.
In the description of the embodiments, the terms "arranged",
"connected", and the like are to be construed broadly unless ex- pressly specified and limited otherwise. For example, it may be a fixed connection, a detachable connection, or an integral connec- tion, may be a mechanical connection or an electrical connection, 5 may be a direct connection or connection through an intermediary, or may be a communication within two elements. The specific mean- ing of the above terms in the present invention may be understood in detail by a person of ordinary in the art.
In addition, the description herein of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly in- dicating the number of technical features indicated. Thus, a fea- ture defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Embodiment 1
An on-line maintainable shaft grounding ring as shown in
FIGS. 1-4 includes a conductive ring 10 and a flexible conductor 20. The conductive ring 10 includes a conductive ring base 11 and an end cover 12. At least two grooves 111 are provided on the con- ductive ring base 11. The flexible conductor 20 is fixed in the grooves 111 through the end cover 12. Preferably, an end cover groove 112 is provided on a flat surface of the conductive ring base outwardly from an inner diameter of the conductive ring base 11, an outer diameter of the end cover groove 112 is smaller than an outer diameter of the conductive ring base 11, the depth of the end cover groove 112 is equal to the thickness of the end cover 12, and the end cover 12 is snapped into the end cover groove 112 and fixed with a hexagon socket countersunk head screw 30 of the conductive ring base.
The flexible conductor 20 includes a fixing portion 21 and a flexible portion 22. The flexible portion 22 includes a plurality of flexible fibre segments. The flexible fibre segments are wrapped into the flexible portion 22 through the fixing portion 21. The flexible portion 22 may be set as a flat circular shape as shown in FIGS. 1-4, a rectangular shape as shown in FIG. 5, or other reasonable shapes in cross section. The cross-section shapes of a plurality of flexible portions 22 may also be designed re-
spectively, mainly according to practical requirements, while changing the shapes of the corresponding grooves 111.
Preferably, the grooves 111 are arranged along the centre circumference of the conductive ring base 11, one side of the grooves 111 near the centre of the conductive ring base 11 is pro- vided with a stop 113, the fixing portion 21 is clamped in the grooves 111 through the stop 113, and the flexible portion 22 ex- tends out of the stop 113, and is arranged towards the centre of the conductive ring base 11.
The end cover 12 is annular. An outer diameter of the end cover 12 is smaller than an outer diameter of the conductive ring base 11. An inner diameter of the end cover 12 is smaller than an inner diameter of the conductive ring base 11. The end cover is fixed with the conductive ring base 11 by means of screws, etc. In the present embodiment, the end cover is directly fixed on a sur- face of the conductive ring base 11 provided with the grooves by means of screws.
The conductive ring base 11 is further provided with three through holes 114 outside an outer diameter of the end cover 12, and the through holes 114 are arranged along the central circum- ference of the conductive ring base 11.
Embodiment 2
In the present embodiment, as shown in FIG. 5, a surface of the conductive ring base 11 is not provided with an end cover groove, and the end cover 12 is directly fixed on the conductive ring base 11 by means of the hexagon socket countersunk head screw 30.
In the above two embodiments, the conductive ring base 11, the end cover 12, the fixing portion 21, and the hexagon socket countersunk head screw 30 are all made of brass in order to ensure electrical conductivity.
As shown in FIG. 6, in actual use, the shaft grounding ring of the present invention may be sheathed on an output shaft 41 of a motor 40 and fixed on an outer wall of a motor housing 42. The flexible portion 22 of the flexible conductor in the shaft ground- ing ring is in contact with the output shaft 41 of the motor. When the motor is working, the output shaft 41 of the motor rotates.
Since the flexible portion 22 is a collection of hundreds of thou- sands to millions of flexible conductive fibre segments, and keeps in contact with the output shaft 41 at multiple points, the shaft grounding ring is not sensitive to shaft bounce and play of the motor, and a shaft current may be effectively earthed through the flexible portion 22, the conductive ring 10, the motor housing 42, and a motor ground cable 43 to keep a rotor voltage at an equal potential, i.e. approximately zero potential, with the earth, thereby protecting motor bearings and the output shaft from elec- trostatic corrosion. In addition, since the shaft grounding ring according to the present invention is provided with the end cover 12, it is possible to block external impurities from entering and accelerating the wear of the flexible portion.
In actual use, the shaft grounding ring of the present inven- tion may also be fixed on a bearing side wall at an output shaft inside the motor. In this case, the shaft grounding ring of the present invention may protect the motor bearing and the output shaft from electrostatic corrosion, and the end cover 12 may also block grease if the grease leakage on the bearing side is serious, so as to prevent the grease leakage from reducing the conductive performance of the device.
The above descriptions are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present in- vention. In addition, the technical solutions between the various embodiments may be combined with each other, but it must be based on what can be achieved by a person of ordinary skill in the art.
When a combination of technical solutions is contradictory or can- not be achieved, it should be considered that such a combination of technical solutions does not exist and is not within the pro- tection scope claimed in the present invention.

Claims (6)

CONCLUSIESCONCLUSIONS 1. Online onderhoudbare as-aardingsring, met het kenmerk, dat deze omvat: een geleidende ring en een flexibele geleider, waarbij de geleidende ring een geleidende ringbasis en een eindafdekking om- vat, waarbij ten minste twee groeven zijn aangebracht op de gelei- dende ringbasis en de flexibele geleider is bevestigd in de groe- ven door de eindafdekking.Online maintainable shaft grounding ring, characterized in that it comprises: a conductive ring and a flexible conductor, the conductive ring comprising a conductive ring base and an end cover, with at least two grooves formed on the conductive ring base and the flexible conductor is fixed in the grooves through the end cover. 2. Online onderhoudbare as-aardingsring volgens conclusie 1, met het kenmerk, dat de flexibele geleider een bevestigingsgedeelte en een flexibel gedeelte omvat, waarbij het flexibele gedeelte een veelvoud aan flexibele vezelsegmenten omvat en de flexibele vezel- segmenten zijn gewikkeld in de flexibel gedeelte door het bevesti- gingsgedeelte.An online serviceable shaft grounding ring according to claim 1, characterized in that the flexible conductor includes a mounting portion and a flexible portion, the flexible portion comprising a plurality of flexible fiber segments, and the flexible fiber segments are wound in the flexible portion by the confirmation part. 3. Online onderhoudbare as-aardingsring volgens conclusie 2, met het kenmerk, dat de groeven zijn aangebracht langs de middenomtrek van de geleidende ringbasis, waarbij een zijde van de groeven na- bij het midden van de geleidende ringbasis is voorzien van een aanslag, waarbij het bevestigingsgedeelte door de aanslag in de groeven wordt geklemd, het flexibele gedeelte uitsteekt buiten de aanslag en een binnendiameter van de eindafdekking richting het midden van de geleidende ringbasis is gelegen.3. An online serviceable shaft grounding ring according to claim 2, wherein the grooves are provided along the center periphery of the conductive ring base, one side of the grooves near the center of the conductive ring base being provided with a stop, wherein the mounting portion is clamped into the grooves by the stopper, the flexible portion protrudes beyond the stopper, and an inner diameter of the end cover faces the center of the conductive ring base. 4. Online onderhoudbare as-aardingsring volgens conclusie 1, met het kenmerk, dat de eindafdekking ringvormig is, waarbij een bui- tendiameter van de eindafdekking kleiner is dan een buitendiameter van de geleidende ringbasis en een binnendiameter van de eindaf- dekking kleiner is dan een binnendiameter van de geleidende ring- basis.An online serviceable shaft grounding ring according to claim 1, characterized in that the end cover is ring-shaped, wherein an outer diameter of the end cover is less than an outer diameter of the conductive ring base and an inner diameter of the end cover is less than one inner diameter of the conductive ring base. 5. Online onderhoudbare as-aardingsring volgens conclusie 2, met het kenmerk, dat de geleidende ringbasis, de eindafdekking en het bevestigingsgedeelte alle zijn gemaakt van messing.5. The on-line serviceable shaft grounding ring according to claim 2, wherein said conductive ring base, end cover and fixing portion are all made of brass. 6. Online onderhoudbare as-aardingsring volgens conclusie 1, met het kenmerk, dat de geleidende ringbasis verder is voorzien van ten minste drie doorgaande gaten buiten een buitendiameter van de eindafdekking, waarbij de doorgaande gaten zijn aangebracht langs de centrale omtrek van de geleidende ringbasis.6. The online serviceable shaft grounding ring of claim 1, wherein said conductive ring base further includes at least three through holes outside an outer diameter of said end cover, said through holes being disposed along the central periphery of said conductive ring base.
NL2029683A 2021-11-09 2021-11-09 On-line maintainable shaft grounding ring NL2029683B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2029683A NL2029683B1 (en) 2021-11-09 2021-11-09 On-line maintainable shaft grounding ring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2029683A NL2029683B1 (en) 2021-11-09 2021-11-09 On-line maintainable shaft grounding ring

Publications (1)

Publication Number Publication Date
NL2029683B1 true NL2029683B1 (en) 2023-06-05

Family

ID=86646820

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2029683A NL2029683B1 (en) 2021-11-09 2021-11-09 On-line maintainable shaft grounding ring

Country Status (1)

Country Link
NL (1) NL2029683B1 (en)

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