CN110571110A - Moving contact of circuit breaker - Google Patents
Moving contact of circuit breaker Download PDFInfo
- Publication number
- CN110571110A CN110571110A CN201910813695.8A CN201910813695A CN110571110A CN 110571110 A CN110571110 A CN 110571110A CN 201910813695 A CN201910813695 A CN 201910813695A CN 110571110 A CN110571110 A CN 110571110A
- Authority
- CN
- China
- Prior art keywords
- contact
- blade
- blades
- support
- circuit breaker
- 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.)
- Granted
Links
- 210000001503 joint Anatomy 0.000 claims 2
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 6
- 239000004332 silver Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 2
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
Landscapes
- Breakers (AREA)
Abstract
The invention relates to the technical field of circuit breakers, and particularly discloses a moving contact of a circuit breaker, which comprises a contact system, a contact support, a contact spring, a contact side plate and a connecting shaft, wherein the contact spring is positioned between the contact system and the contact support, the contact system comprises a plurality of contact blades, the contact blades comprise a first contact blade and a second contact blade, the contact blades comprise abutting ends abutted against the contact spring, positioning grooves for abutting against the contact spring are formed in the abutting ends, the depth of the positioning grooves in the second contact blade is smaller than that of the positioning grooves in the first contact blade, the second contact blade is positioned on two sides of the contact system, and the first contact blade is positioned in the middle of the contact system. By adopting the scheme, the terminal pressure of the product is compensated through the contact blades with two structures, so that the electric service life and the mechanical service life of the product are prolonged, and meanwhile, the breaker can have a moving contact of the breaker with higher short-circuit breaking capacity.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to a movable contact structure of a circuit breaker.
Background
At present, a moving contact of a circuit breaker generally comprises a contact support, a rotating shaft, a bottom support, a contact spring, a contact blade, a flexible connection, a moving contact busbar and a contact cover, contact side plates are arranged on two sides of the contact support, and the rotating shaft is arranged between the contact side plates. The flexible connection is electrically connected with the contact blade and the moving contact busbar, the moving contact busbar is fixed on the bottom support, and the bottom support is fixed on the circuit breaker base. The lower end part of the contact side plate is rotationally clamped on the bottom support, the moving contact busbar is fixed on the bottom support, the contact blade is sleeved on the rotating shaft, and the contact cover is covered on the front part of the moving contact.
The contact blade adopts a contact blade structure, and through simulation software analysis, under the condition of large current, the pressure curve of each contact blade is as shown in figure 1, the stress of the contact blades at two sides is obviously smaller than that of the contact blades at the middle, the stress of the contact blades at two sides is reduced under the action of an electromagnetic field, the contact blades are easy to repel an arc, the time of the arc acting on the contact blades at two sides is longer than that of the contact blades at the middle, silver points on the contact blades at two sides can be seriously burnt, the parameter change of the contact blade of the whole contact system is large, and the continuous use is influenced. For example, in a short-circuit breaking test, after O breaking, CO cannot be tested continuously or a breaker cannot be connected after test, and the like, so that the service life and the breaking capacity of a product are greatly reduced.
As shown in fig. 1, the abscissa is: the number of the contact blades is based on the contact blade at the middle; the ordinate is the stress condition of each contact blade.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the movable contact of the circuit breaker, which compensates the final pressure of the product through the contact blades with two structures, thereby prolonging the electric service life and the mechanical service life of the product, and simultaneously enabling the circuit breaker to have higher short-circuit breaking capacity.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a moving contact of circuit breaker, includes contact system, contact support, contact spring, contact curb plate and connecting axle, the contact spring is located between contact system and the contact support, the contact system includes a plurality of contact piece, the contact piece includes first contact piece and second contact piece, the contact piece include with the butt end of contact spring butt, the butt is served and is provided with the constant head tank that supplies the contact spring butt, the degree of depth of the constant head tank on the second contact piece is less than the degree of depth of the constant head tank on the first contact piece, the second contact piece is located contact system's both sides, and first contact piece is located contact system's middle part.
in the technical scheme, the contact blades with two structures are distributed in the contact system according to a certain rule, the design of the second contact blade can increase the pressure of the contact blades on two sides, so that under the electromagnetic influence of large current, the contact parameters of each contact blade can be kept in balance, the influence of repulsion arc discharge on silver points is reduced, the final pressure of a product is compensated, the reliability and the stability of current bearing of each contact blade can be enhanced under large short-circuit current, the final pressure of the contact system and the strength of mechanisms and materials of the circuit breaker can be optimally balanced, the electrical life and the mechanical life of the product can be prolonged, and meanwhile, the circuit breaker can have higher short-circuit breaking capacity.
As a further arrangement of the invention, the number of the contact blades is at least 3, and the second contact blades are symmetrically distributed on two sides of the first contact blades.
In the above technical scheme, the preferred number of the contact blades is three or more, so that the distribution of the first contact blades and the second contact blades is convenient, the contact system is axially symmetrically arranged, the final pressure compensation effect is good, when the number of the contact blades is more than three, the second contact blades are positioned on two sides of the total first contact blade instead of two sides of a single first contact blade, namely the second contact blades are positioned on two sides of the contact system, and the first contact blades are positioned in the middle of the contact system.
As a further arrangement of the invention, the number of the second contact blades is less than or equal to 2 times of the number of the first contact blades.
Among the above-mentioned technical scheme, pressure balance effect is better.
As a further arrangement of the invention, the first contact blade and the second contact blade are both rotationally connected to the same connecting shaft, and the two contact side plates are clamped at two sides of the contact support and are rotationally connected to the connecting shaft.
Among the above-mentioned technical scheme, first contact blade and second contact blade are pivoted simultaneously, avoid the error, and the contact supports also to be connected on this connecting axle, and the contact curb plate is in the same place contact support and contact system equipment, simple structure, and the equipment is convenient.
As a further arrangement of the invention, the contact support is provided with a through hole for mounting the contact spring, the other side of the contact support compared with the contact system is provided with an abutting plate for abutting the end part of the contact spring, and two ends of the abutting plate are connected with the contact side plate and fixed on the contact support through the contact side plate.
Among the above-mentioned technical scheme, the through-hole supports the setting for penetrating the contact, and processing is convenient, and the butt board is for the spring holder of contact spring, and the both ends of contact spring butt respectively in butt board and constant head tank, and the butt board passes through the contact curb plate to be fixed on the contact supports, simple structure, simple to operate.
As a further arrangement of the invention, a positioning block and a positioning hole which are mutually inserted are arranged between the abutting plate and the contact support.
Among the above-mentioned technical scheme, the setting of locating piece and locating hole makes things convenient for the butt board location, makes to connect more accurately convenient, and supplementary fixed effect in addition avoids shifting.
The invention is further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a force curve diagram of each contact blade in the prior art;
FIG. 2 is an exploded view of the structure of an embodiment of the present invention;
FIG. 3 is an exploded view of the structure of an embodiment of the present invention;
FIG. 4 is an exploded view of a first contact blade according to an embodiment of the present invention;
Figure 5 is an exploded view of a second contact blade according to an embodiment of the present invention.
Detailed Description
The specific embodiment of the invention is shown in fig. 1-5, a movable contact of a circuit breaker comprises a contact system 1, a contact support 2, a contact spring 3, a contact side plate 4 and a connecting shaft 5, wherein the contact spring 3 is located between the contact system 1 and the contact support 2, the contact system 1 comprises a plurality of contact blades, the contact blades comprise a first contact blade 11 and a second contact blade 12, the contact blades comprise abutting ends 111 and 121 abutting against the contact spring 3, positioning grooves 1111 and 1211 for abutting against the contact spring 3 are arranged on the abutting ends 111 and 121, the depth of the positioning groove 1211 on the second contact blade 12 is smaller than that of the positioning groove 1111 on the first contact blade 11, the second contact blade 12 is located on two sides of the contact system 1, and the first contact blade 11 is located in the middle of the contact system 1. The first contact blade 11 and the second contact blade 12 are both provided with silver dots, the contact blades with two structures are distributed in the contact system 1 according to a certain rule, the design of the second contact blade 12 can increase the pressure of the contact blades on two sides, so that under the electromagnetic influence of large current, the contact parameters of each contact blade can be kept consistent in a balanced manner, the influence of repulsion arc discharge on the silver dots is reduced, the final pressure of a product is compensated, the reliability and the stability of current bearing of each contact blade can be enhanced under large short-circuit current, the final pressure of the contact system 1 and the strength of mechanisms and materials of a circuit breaker can be optimally balanced, the electrical service life and the mechanical service life of the product can be prolonged, and the circuit breaker can have higher short-circuit breaking capacity.
The number of the contact blades is at least 3, and the second contact blades 12 are symmetrically distributed on two sides of the first contact blade 11. . The preferred number of the contact blades is three or more, so that the distribution of the first contact blades 11 and the second contact blades 12 is convenient, the contact system 1 is arranged in an axial symmetry manner, the final pressure compensation effect is good, and when the number of the contact blades is more than three, the second contact blades 12 are positioned on two sides of the total first contact blade 11 instead of two sides of a single first contact blade 11.
the number of the second contact blades 12 is less than or equal to 2 times the number of the first contact blades 11.
The first contact blade 11 and the second contact blade 12 are both rotatably connected to the same connecting shaft 5, and the two contact side plates 4 are clamped on two sides of the contact support 2 and rotatably connected to the connecting shaft 5. The first contact blade 11 and the second contact blade 12 rotate simultaneously to avoid errors, the contact support 2 is also connected to the connecting shaft 5, and the contact side plate 4 assembles the contact support 2 and the contact system 1 together, so that the structure is simple and the assembly is convenient.
The contact support 2 is provided with a through hole 2 for mounting the contact spring 3, the other side of the contact support 2 relative to the contact system 1 is provided with an abutting plate 6 for abutting the end of the contact spring 3, and two ends of the abutting plate 6 are connected with the contact side plate 4 and fixed on the contact support 2 through the contact side plate 4. Through-hole 2 is for piercing through the setting of contact support 2, and processing is convenient, and butt board 6 is for contact spring 3's spring holder, and contact spring 3's both ends butt respectively in butt board 6 and constant head tank 1111, 1211, and butt board 6 passes through contact curb plate 4 to be fixed on contact support 2, simple structure, simple to operate.
A positioning block 22 and a positioning hole 61 are provided between the abutting plate 6 and the contact support 2. The positioning block 22 and the positioning hole 61 are arranged to facilitate positioning of the abutting plate 6, so that connection is more accurate and convenient, and the positioning block also has an auxiliary fixing effect to avoid displacement.
The installation principle is as follows: the contact system 1 is arranged on a contact support 2, a contact spring 3 is arranged in a corresponding through hole 2 of the contact support 2, and then the components are fixed together through a contact side plate 4 and a connecting shaft 5 to form a movable contact structure.
the contact system 1 consists of a first contact blade 11, a second contact blade 12, a silver point 13, a flexible connection 7 and a bus bar 8, wherein the second contact blade 12 is distributed on the left side and the right side of the whole contact system 1, the first contact blade 11 is arranged in the middle of the contact system 1, and the contact blades of the two structures are symmetrically arranged based on the longitudinal axis of the whole contact system 1. The first contact blade 11 and the second contact blade 12 each contain silver dots 13. The difference in the structure of the two contact blades, based on A1, is that the second contact blade 12 is higher than the first contact blade 11 by a distance X. The value of X is not limited, so that the size of X is adjusted according to application scenarios for different types of circuit breakers, and after the X distance is matched with the contact spring 3, the stress on two sides of the contact system 1 is increased under the condition that large current can be compensated. The reliability and the stability of current bearing of each contact blade are enhanced, the final pressure of the contact system 1 and the strength of mechanisms and materials of the circuit breaker are optimally balanced, the electrical life and the mechanical life of a product are prolonged, and meanwhile, the circuit breaker can have higher short circuit breaking capacity.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention.
Claims (7)
1. The utility model provides a moving contact of circuit breaker, includes contact system, contact support, contact spring, contact curb plate and connecting axle, the contact spring is located between contact system and the contact support, the contact system includes a plurality of contact piece, its characterized in that: the contact blade comprises a first contact blade and a second contact blade, the contact blade comprises a butt joint end abutted against the contact spring, a positioning groove for abutting against the contact spring is formed in the butt joint end, the depth of the positioning groove in the second contact blade is smaller than that of the positioning groove in the first contact blade, the second contact blade is located on two sides of the contact system, and the first contact blade is located in the middle of the contact system.
2. a movable contact for a circuit breaker as claimed in claim 1, wherein: the number of the contact blades is at least 3, and the second contact blades are symmetrically distributed on two sides of the first contact blade.
3. A movable contact for a circuit breaker as claimed in claim 1 or 2, wherein: the number of the second contact blades is less than or equal to 2 times of the number of the first contact blades.
4. A movable contact for a circuit breaker as claimed in claim 1 or 2, wherein: the first contact blade and the second contact blade are rotatably connected to the same connecting shaft, and the two contact side plates are clamped on two sides of the contact support and rotatably connected to the connecting shaft.
5. A movable contact for a circuit breaker as claimed in claim 3, wherein: the first contact blade and the second contact blade are rotatably connected to the same connecting shaft, and the two contact side plates are clamped on two sides of the contact support and rotatably connected to the connecting shaft.
6. A movable contact for a circuit breaker as claimed in claim 1, 2 or 5, wherein: the contact support is provided with a through hole for installing a contact spring, the other side of the contact support, which is opposite to the contact system, is provided with a butt plate for abutting against the end part of the contact spring, and two ends of the butt plate are connected with the contact side plate and fixed on the contact support through the contact side plate.
7. A movable contact for a circuit breaker as claimed in claim 5, wherein: and a positioning block and a positioning hole which are mutually inserted are arranged between the abutting plate and the contact support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910813695.8A CN110571110B (en) | 2019-08-30 | 2019-08-30 | Moving contact of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910813695.8A CN110571110B (en) | 2019-08-30 | 2019-08-30 | Moving contact of circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110571110A true CN110571110A (en) | 2019-12-13 |
| CN110571110B CN110571110B (en) | 2024-06-04 |
Family
ID=68776887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910813695.8A Active CN110571110B (en) | 2019-08-30 | 2019-08-30 | Moving contact of circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110571110B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114649174A (en) * | 2020-12-21 | 2022-06-21 | 上海良信电器股份有限公司 | Moving contact system easy to install and assembling method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908443A (en) * | 2010-08-05 | 2010-12-08 | 无锡新宏泰电器科技股份有限公司 | Contact system for circuit breaker |
| CN202816838U (en) * | 2012-07-31 | 2013-03-20 | 上海电科电器科技有限公司 | Movable contact of low-voltage circuit breaker |
| CN204303730U (en) * | 2015-01-23 | 2015-04-29 | 德力西电气有限公司 | The structure of contact terminal of air-break and contact system |
| CN105762039A (en) * | 2016-04-29 | 2016-07-13 | 首瑞（天津）电气设备有限公司 | Circuit breaker contact system and circuit breaker |
| US20180158629A1 (en) * | 2016-12-05 | 2018-06-07 | Lsis Co., Ltd. | Air circuit breaker |
| CN207587676U (en) * | 2017-12-27 | 2018-07-06 | 常熟开关制造有限公司(原常熟开关厂） | A kind of moving contact of breaker |
| CN210778463U (en) * | 2019-08-30 | 2020-06-16 | 德力西电气有限公司 | Moving contact of circuit breaker |
-
2019
- 2019-08-30 CN CN201910813695.8A patent/CN110571110B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908443A (en) * | 2010-08-05 | 2010-12-08 | 无锡新宏泰电器科技股份有限公司 | Contact system for circuit breaker |
| CN202816838U (en) * | 2012-07-31 | 2013-03-20 | 上海电科电器科技有限公司 | Movable contact of low-voltage circuit breaker |
| CN204303730U (en) * | 2015-01-23 | 2015-04-29 | 德力西电气有限公司 | The structure of contact terminal of air-break and contact system |
| CN105762039A (en) * | 2016-04-29 | 2016-07-13 | 首瑞（天津）电气设备有限公司 | Circuit breaker contact system and circuit breaker |
| US20180158629A1 (en) * | 2016-12-05 | 2018-06-07 | Lsis Co., Ltd. | Air circuit breaker |
| CN207587676U (en) * | 2017-12-27 | 2018-07-06 | 常熟开关制造有限公司(原常熟开关厂） | A kind of moving contact of breaker |
| CN210778463U (en) * | 2019-08-30 | 2020-06-16 | 德力西电气有限公司 | Moving contact of circuit breaker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114649174A (en) * | 2020-12-21 | 2022-06-21 | 上海良信电器股份有限公司 | Moving contact system easy to install and assembling method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110571110B (en) | 2024-06-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: Xiong Li Inventor after: Wu Jianbin Inventor after: Cui Binjie Inventor after: Zhang Jun Inventor before: Xiong Li Inventor before: Wu Jianbin Inventor before: Cui Yunjie Inventor before: Zhang Jun |
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| CB03 | Change of inventor or designer information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |