CN111986965A - Moving contact structure of circuit breaker - Google Patents
Moving contact structure of circuit breaker Download PDFInfo
- Publication number
- CN111986965A CN111986965A CN201910432484.XA CN201910432484A CN111986965A CN 111986965 A CN111986965 A CN 111986965A CN 201910432484 A CN201910432484 A CN 201910432484A CN 111986965 A CN111986965 A CN 111986965A
- Authority
- CN
- China
- Prior art keywords
- movable contact
- contact
- arc
- circuit breaker
- moving
- 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.)
- Pending
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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
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- 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
- H01H73/18—Means for extinguishing or suppressing arc
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The utility model provides a circuit breaker movable contact structure, includes movable contact (2) and is used for adorning movable contact plate (1) of movable contact (2), movable contact (2) dress is in contact end (101) of movable contact plate (1), its characterized in that: the movable contact (2) is higher than an arc striking part (101a) of a contact end (101) of the movable contact plate (1), the arc striking part (101a) extends to the top end, and the top end is a round angle. This circuit breaker movable contact structure, with the moving contact higher than the portion of striking slightly, be favorable to electric arc to jump at electric arc transfer in-process, and striking structure top adopts the closed angle of circular arc rounding off, more does benefit to and lengthens electric arc to more be favorable to the transfer and the extinguishing of electric arc.
Description
Technical Field
The invention belongs to the technical field of circuit breakers, and particularly relates to a moving contact structure of a circuit breaker.
Background
The circuit breaker is an important part in a distribution electrical appliance, is mainly used for an industrial low-voltage power system, and is used for connecting and disconnecting current in a power grid circuit and protecting lines and power supply equipment from damage caused by faults of overload, undervoltage, short circuit, single-phase grounding and the like. The function of the circuit breaker to break overload or short-circuit current is mainly accomplished by an arc extinguishing chamber installed in the circuit breaker. When fault current occurs in a circuit and the current value exceeds the set protection range of the circuit breaker, the tripping mechanism acts to rapidly disconnect the moving contact and the fixed contact of the circuit breaker, the voltage between the moving contact and the fixed contact causes air medium discharge to generate high-temperature electric arc, the electric arc can burn the contact to influence the connection effect of the contact, so that the electric arc is transferred from the contact as fast as possible and is rapidly extinguished, the contact burning can be effectively reduced, and the purpose of prolonging the service life of the circuit breaker is achieved. In order to improve the arc extinguishing performance of the arc extinguishing chamber, generally, the arc enters into the arc extinguishing grid pieces of the arc extinguishing chamber quickly, so that the grid pieces effectively cut the arc, and the aim of quickly extinguishing the arc is fulfilled. The number of the grid pieces for effectively cutting the electric arc directly influences the arc extinguishing effect, so that the electric arc can be cut by more grid pieces under the condition of limited contact opening distance, and the breaking is favorably improved.
Disclosure of Invention
The invention aims to provide a movable contact structure of a circuit breaker.
In order to achieve the purpose, the invention adopts the following solution: the utility model provides a circuit breaker movable contact structure, includes movable contact (2) and is used for adorning movable contact plate (1) of movable contact (2), movable contact (2) dress is in contact end (101) of movable contact plate (1), its characterized in that: the movable contact (2) is higher than an arc striking part (101a) of a contact end (101) of the movable contact plate (1), the arc striking part (101a) extends to the top end, and the top end is a round angle.
The moving contact (2) is higher than an arc striking part (101a) of a contact end (101) of the moving contact plate (1) by 0.1-0.5 mm, and the arc of the arc striking part (101a) extends to the top end to intersect with an extension line of the upper surface of the moving contact plate (1) and is in smooth transition.
The moving contact (A) and the static contact (B) are coupled and arranged in the arc extinguish chamber (C).
Compared with the prior art, the invention has the following positive effects: the arc transfer step with a certain size is beneficial to jumping in the moving process of the arc and is more beneficial to timely transferring the arc from the driven contact.
Drawings
Fig. 1 is a schematic structural diagram of the present embodiment.
Fig. 2 is a schematic structural diagram of the movable contact in the embodiment.
In the figure: 1. the device comprises a movable contact plate 2, a movable contact 101, a contact end 101a, an arc striking part, an A, a movable contact, a B, a fixed contact, a C and an arc extinguishing chamber.
Detailed Description
The present invention will be described with reference to the following embodiments and accompanying drawings.
In order to achieve the purpose, the invention adopts the following solution: the utility model provides a circuit breaker movable contact structure, includes movable contact (2) and is used for adorning movable contact plate (1) of movable contact (2), movable contact (2) dress is in contact end (101) of movable contact plate (1), its characterized in that: the movable contact (2) is higher than an arc striking part (101a) of a contact end (101) of the movable contact plate (1), the arc striking part (101a) extends to the top end, and the top end is a round angle.
The moving contact (2) is higher than an arc striking part (101a) of a contact end (101) of the moving contact plate (1) by 0.1-0.5 mm, and the arc of the arc striking part (101a) extends to the top end to intersect with an extension line of the upper surface of the moving contact plate (1) and is in smooth transition.
The moving contact (A) and the static contact (B) are coupled and arranged in the arc extinguish chamber (C).
The striking portion 101a of movable contact 2 and contact end 101 passes through the step smooth transition of certain size, when moving, produce electric arc when the stationary contact separates, the stationary arc root moves to the explosion chamber grid piece along static contact B striking piece, move the arc root and move to explosion chamber C direction along movable contact A front end striking portion 101a, electric arc leaves the contact and is elongated gradually at the removal in-process electric arc, movable contact A opens the back front end closed angle completely and is close to explosion chamber C striking grid piece, take place electric arc breakdown between the two, it shifts to the explosion chamber to move the arc root from the movable contact closed angle. Because the moving contact 2 and the arc striking part 101a are in parallel and level connection transition, the moving arc root is quickly separated from the contact and transferred to the front end of the moving contact A, the ablation of the arc to the contact is reduced, the contact is protected, and the electrical service life is prolonged. Electric arc is constantly elongated at the transfer in-process, because run-on portion 101a circular arc to the top extend with the upper surface extension line of movable contact board 1 is crossing, makes the striking structure of movable contact not upwards, so do benefit to and extend electric arc forward to and the closed angle structure is favorable to electric arc to jump to explosion chamber C, consequently is favorable to electric arc to get into explosion chamber C arc extinguishing fast, thereby reaches the purpose that improves the arc extinguishing effect.
An arc striking angle (201) facing to the opening and stopping position of the moving contact (6) is arranged at the position, corresponding to the moving contact (6), of the top arc-extinguishing grid piece (2), and the distance between the arc striking angle (201) and the opening and stopping position of the moving contact (6) is 0.1-3 mm.
The number of the bottom arc-extinguishing grid pieces (5) is at least 3.
The top arc-extinguishing grid plate (2) and the arc striking angle (201) form an inner bending angle not less than 120 degrees.
And the arc striking piece (701) of the static contact (7) corresponding to the moving contact (6) extends downwards.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all the minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims (3)
1. The utility model provides a circuit breaker movable contact structure, includes movable contact (2) and is used for adorning movable contact plate (1) of movable contact (2), movable contact (2) dress is in contact end (101) of movable contact plate (1), its characterized in that: the movable contact (2) is higher than an arc striking part (101a) of a contact end (101) of the movable contact plate (1), the arc striking part (101a) extends to the top end, and the top end is a round angle.
2. The circuit breaker movable contact structure of claim 1, wherein: the moving contact (2) is higher than an arc striking part (101a) of a contact end (101) of the moving contact plate (1) by 0.1-0.5 mm, and the arc of the arc striking part (101a) extends to the top end to intersect with an extension line of the upper surface of the moving contact plate (1) and is in smooth transition.
3. The circuit breaker movable contact structure of claim 1, wherein: the moving contact (A) and the static contact (B) are coupled and arranged in the arc extinguish chamber (C).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910432484.XA CN111986965A (en) | 2019-05-23 | 2019-05-23 | Moving contact structure of circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910432484.XA CN111986965A (en) | 2019-05-23 | 2019-05-23 | Moving contact structure of circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111986965A true CN111986965A (en) | 2020-11-24 |
Family
ID=73436746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910432484.XA Pending CN111986965A (en) | 2019-05-23 | 2019-05-23 | Moving contact structure of circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111986965A (en) |
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2019
- 2019-05-23 CN CN201910432484.XA patent/CN111986965A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20201124 |