CN108735557B - Repulsion unlocking device of breaker moving contact and working method thereof - Google Patents
Repulsion unlocking device of breaker moving contact and working method thereof Download PDFInfo
- Publication number
- CN108735557B CN108735557B CN201810888022.4A CN201810888022A CN108735557B CN 108735557 B CN108735557 B CN 108735557B CN 201810888022 A CN201810888022 A CN 201810888022A CN 108735557 B CN108735557 B CN 108735557B
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- moving contact
- rotating shaft
- contact
- metal shaft
- shaft
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 70
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000010891 electric arc Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/121—Protection of release mechanisms
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/666—Operating arrangements
Landscapes
- Breakers (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a repulsion unlocking device of a moving contact of a circuit breaker and a working method thereof, wherein the device comprises a shell, the moving contact, a fixed contact, an operating mechanism, a rotating shaft and a spring; the rotating shaft rotates around the first metal shaft and is arranged on the supporting plate; the rotating shaft is connected with the operating mechanism through a supporting plate; a bracket is arranged in the rotating shaft; a shell reset boss is arranged above the shell and the rotating shaft; one end of the moving contact rotates around the second metal shaft and is arranged on the rotating shaft, and the other end of the moving contact is of a hook-shaped structure; a sliding groove is formed in the moving contact; a third metal shaft is arranged in the sliding groove; one end of the spring is connected to the third metal shaft, and the other end of the spring is connected to the bracket. The spring can accelerate the repulsion of the moving contact when the moving contact is repelled to a certain height, effectively avoids the problem of the repulsion and the fallback of the moving contact, and is beneficial to improving the short circuit breaking capacity of the circuit breaker.
Description
Technical Field
The invention relates to a circuit breaker, in particular to a device for unlocking a moving contact of the circuit breaker and a working method thereof.
Background
When the low-voltage circuit breaker is disconnected, a moving contact and a fixed contact of the low-voltage circuit breaker are required to be rapidly separated under the action of electric repulsive force and generate an electric arc, the counter force of a spring on the moving contact is increased along with the increase of the separation distance of the moving contact and the fixed contact, the electric arc is lengthened and the electric repulsive force starts to be reduced, when the electric repulsive force is smaller than the counter force of a moving contact spring, the moving contact starts to fall back, and when the electric repulsive force is larger than the counter force of the contact spring, the moving contact is repelled again, and the circuit breaker is circulated to a circuit breaker mechanism to release, and the circuit is called contact bounce in the field. The contact bounce can delay breaking time, cause arc reburning and burn the breaker when serious, and reduce breaking capacity.
In the prior art, a small-capacity circuit breaker generally uses an electromagnet to attract so as to enable a mechanism to be quickly tripped when large current is broken, contact bounce is avoided, and an electronic controller is generally used for enabling the mechanism to be quickly tripped when large current is broken. As the requirements of users on the capacity and breaking capacity of the circuit breaker are higher, the speed of the electromagnetic attraction and the electronic controller for tripping the mechanism can not meet the requirements of the users.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses a device for unlocking a moving contact of a circuit breaker and a working method thereof.
The technical scheme of the invention is as follows:
a moving contact repulsion unlocking device of a circuit breaker comprises a shell, a moving contact, a fixed contact, an operating mechanism, a rotating shaft and a spring; the rotating shaft rotates around the first metal shaft and is arranged on the supporting plate; the rotating shaft is connected with the operating mechanism through a supporting plate; a bracket is arranged in the rotating shaft; a shell reset boss is arranged above the shell and the rotating shaft; one end of the moving contact rotates around the second metal shaft and is arranged on the rotating shaft, and the other end of the moving contact is of a hook-shaped structure; a sliding groove is formed in the moving contact; a third metal shaft is arranged in the sliding groove; one end of the spring is connected to the third metal shaft, and the other end of the spring is connected to the bracket.
The sliding groove is characterized in that the front end of the sliding groove is provided with a front arc structure, and the rear end of the sliding groove is provided with a rear arc structure.
The further technical scheme is that when the moving contact is contacted with the fixed contact, the third metal shaft stays in the front circular arc structure; when the movable contact is separated from the fixed contact and the rotating shaft is at the initial position, the third metal shaft slides in the sliding groove or stays in the rear arc structure; when the moving contact is separated from the fixed contact and the rotating shaft is in a rotating state, and the hook-shaped structure of the moving contact is clamped on the reset boss of the shell, the third metal shaft slides in the sliding groove or reaches the front arc structure.
A working method of a moving contact unlocking device of a circuit breaker comprises the following steps:
step 1, when a breaker is switched on, a moving contact and a fixed contact are contacted; the third metal shaft stays in the front circular arc structure;
step 2, a large current passes through the breaker, and a moving contact and a fixed contact are separated; the rotating shaft is positioned at an initial position; the moving contact drives the third metal shaft to rotate in a first direction, the spring is gradually lengthened and rotates around the bracket in the first direction, and meanwhile the third metal shaft slides along the direction of the backward circular arc structure of the sliding groove until the moving contact is repelled to a first height H1, and the third metal shaft slides into the backward circular arc structure;
step 3, the third metal shaft stays in the rear arc structure; the moving contact stops rotating and locks the current state until the operating mechanism is tripped;
step 4, after the operating mechanism is tripped, the operating mechanism drives the rotating shaft to rotate in a first direction through the supporting plate, and the moving contact rotates along with the rotating shaft; when the movable contact rotates to the second height H2, the hook-shaped structure of the movable contact is clamped on the reset boss of the shell and stops rotating; the rotating shaft continues to rotate in the first direction, and the spring is gradually lengthened and rotates around the bracket in the second direction;
step 5, the rotating shaft continues to rotate, the third metal shaft slides along the direction of the front circular arc structure of the sliding groove, the spring 70 gradually shortens until the third metal shaft slides into the front circular arc structure, the moving contact contacts with the fixed contact, and the moving contact reset is completed
The first direction and the second direction are opposite directions.
The beneficial technical effects of the invention are as follows:
1. according to the invention, the spring is arranged, and the sliding groove on the movable contact is combined, so that the repulsion of the movable contact can be accelerated when the movable contact is repelled to a certain height, the problem that the movable contact is repelled to fall back is effectively avoided, and the short circuit breaking capacity of the circuit breaker is improved.
2. The sliding groove on the movable contact is internally provided with the rear arc structure, so that the movable contact can be effectively locked at the repulsive-open position to wait for the tripping of the operating mechanism, the breaking time of the circuit breaker is shortened, and the short-circuit breaking capacity of the circuit breaker is improved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of a moving contact and a stationary contact in contact.
Fig. 3 is a schematic structural view of the moving contact.
Fig. 4 is a schematic diagram of the moving contact after receiving an electric repulsive force and just separated from the fixed contact.
Fig. 5 is a schematic view of the third metal shaft in the rear arc structure without rotation of the shaft.
Fig. 6 is a schematic view of the movable contact being snapped onto the housing reset boss.
Fig. 7 is a schematic diagram of a state before the movable contact is contacted with the fixed contact again.
Detailed Description
Fig. 1 is a schematic structural view of the present invention. As shown in fig. 1, the circuit breaker of the present invention includes a base 30, and a housing 50 and a stationary contact 40 are mounted on the base 30. The housing 50 is provided with an operating mechanism 60, a rotary shaft 10 and a moving contact 20.
The rotary shaft 10 is connected to the operating mechanism 60 via a support plate 601. The rotation shaft 10 rotates around a first metal shaft 10b and is mounted on the support plate 601. Specifically, the first metal shaft 10b is fixed on the support plate 601, and the rotation shaft 10 is mounted on the first metal shaft 10b and rotatable around the first metal shaft 10 b. The operating mechanism 60 drives the rotating shaft 10 to rotate around the first metal shaft 10 b.
Fig. 2 is a schematic diagram of a moving contact and a stationary contact in contact. Fig. 3 is a schematic structural view of the moving contact. As shown in fig. 2 and 3, a bracket 10a is attached to the rotary shaft 10. When the rotating shaft 10 is at the initial position, i.e., the rotating shaft 10 is not rotated, the bracket 10a is positioned at the bottom of the rotating shaft 10. When the rotation shaft 10 rotates, the bracket 10a rotates accordingly. One end of the movable contact 20 rotates around the second metal shaft 90 and is mounted on the rotating shaft 10. Specifically, two ends of the second metal shaft 90 are fixed on the rotating shaft 10, one end of the moving contact 20 is mounted on the second metal shaft 90, and the moving contact 20 can rotate around the second metal shaft 90. The other end of the moving contact 20 is a hook-shaped structure, and the lower end of the hook-shaped structure is used for contacting with the fixed contact 40 in the opening direction of the hook-shaped structure. The movable contact 20 is provided with a sliding groove 20b. A third metal shaft 80 is installed inside the sliding groove 20b, i.e., the third metal shaft 80 is passed through the sliding groove 20b and placed inside the sliding groove 20b. The front end of the sliding groove 20b is provided with a front circular arc structure 20a, and the rear end of the sliding groove 20b is provided with a rear circular arc structure 20c. The third metal shaft 80 may slide along the sliding groove 20b, or stay in the front circular arc structure 20a, or stay in the rear circular arc structure 20c. One end of the spring 70 is connected to the third metal shaft 80, and the other end is connected to the bracket 10a.
In the device of the present invention, the movable contact 20 is rotatable about the second metal shaft 90 to be in contact with or separated from the stationary contact 40. When the movable contact 20 rotates, the third metal shaft 80 slides within the sliding groove 20b. When the rotating shaft 10 rotates, the moving contact 20 can be driven to rotate.
Specifically, when the movable contact 20 is in contact with the stationary contact 40, the third metal shaft 80 stays in the front circular arc structure 20 a. When the fixed contact 20 is separated from the fixed contact 40 and the rotating shaft 10 is at the initial position, the third metal shaft 80 slides in the sliding groove 20b or stays in the rear arc structure 20c. When the moving contact 20 is separated from the fixed contact 40, the rotating shaft 10 is in a rotating state, and the hook-shaped structure of the fixed contact 20 is clamped on the housing reset boss 50a, the third metal shaft 80 slides in the sliding groove 20b or reaches into the front circular arc structure 20 a.
The working method of the breaker moving contact unlocking device comprises the following steps:
in step 1, when the breaker is switched on, the moving contact 20 is contacted with the fixed contact 40. The third metal shaft 80 stays in the front circular arc structure 20 a. Fig. 2 is a schematic diagram of a moving contact and a stationary contact in contact. The state of the movable contact 20 in step 1 is shown in fig. 2.
Step 2, a large current passes through the circuit breaker, and the moving contact 20 is separated from the fixed contact 40. The moving contact 20 rotates in a first direction. In this embodiment, the first direction is clockwise and the second direction is counterclockwise. Fig. 4 is a schematic diagram of the moving contact after receiving an electric repulsive force and just separated from the fixed contact. As shown in fig. 4, the rotary shaft 10 is at the initial position at this time. During the rotation of the moving contact 20, the spring 70 is gradually elongated and rotates around the bracket 10a in the first direction, and during this process, the third metal shaft 80 receives two main forces, namely, the tensile force of the spring, and the frictional force of the third metal shaft 80 is given to the inner wall of the sliding groove 20b, and when the component force of the tensile force of the spring received by the third metal shaft 80 in the direction of the sliding groove 20b is greater than the frictional force received by the third metal shaft 80, the third metal shaft 80 starts to slide along the direction of the backward circular arc structure 20c of the sliding groove 20b, the spring 70 gradually shortens, and as the angle of the sliding groove 20b relative to the bracket 10a is gradually increased along with the rotation of the moving contact 20, the component force of the tensile force of the spring received by the third metal shaft 80 in the direction of the sliding groove 20b is gradually increased, and the sliding speed of the third metal shaft 80 is gradually increased. Until the movable contact 20 is repelled to the first height H1, the third metal shaft 80 slides into the rear arc structure 20c.
Step 3, the third metal shaft 80 stays in the rear circular arc structure 20c. The moving contact 20 stops rotating and locks the current state until the operating mechanism 60 is tripped. Fig. 5 is a schematic view of the third metal shaft in the rear arc structure without rotation of the shaft. As shown in fig. 5, when the third metal shaft 80 is located in the rear arc structure 20c, the pulling force direction of the spring 70 passes through the center of the second metal shaft 90, the force arm of the force applied by the movable contact 20 is zero, and the movable contact 20 stops rotating and locks the current state until the operating mechanism 60 is tripped. The problem that the moving contact is separated and falls back is effectively avoided, the breaking time of the circuit breaker is shortened, and the short circuit breaking capacity of the circuit breaker is improved. The height of the movable contact 20 shown in fig. 5 is referred to as the first height H1.
Step 4, after the operating mechanism 60 is tripped, the operating mechanism 60 drives the rotating shaft 10 to rotate in the first direction, and the moving contact 20 rotates along with the rotating shaft. When the movable contact 20 rotates to the second height H2, the hook-shaped structure of the movable contact 20 is clamped on the housing reset boss 50a, and the rotation is stopped, and the rotation shaft 10 continues to rotate in the first direction, that is, the movable contact 20 rotates in the second direction relative to the rotation shaft 10. The spring 70 is gradually elongated and rotates about the bracket 10a in the second direction. Fig. 6 is a schematic view of the movable contact being snapped onto the housing reset boss. Fig. 6 shows the state of step 4. The height of the movable contact 20 shown in fig. 6, i.e. the second height H2 above.
In step 5, the rotation shaft 10 continues to rotate, during the rotation process, the third metal shaft 80 receives two main forces, namely, the tension force of the spring, and the friction force of the third metal shaft 80 is given to the inner wall of the sliding groove 20b, when the component force of the tension force of the spring received by the third metal shaft 80 in the direction of the sliding groove 20b is greater than the friction force received by the third metal shaft, the third metal shaft 80 starts to slide along the direction of the sliding groove 20b towards the front circular arc structure 20a, the spring 70 gradually shortens, and as the angle of the sliding groove 20b relative to the bracket 10a increases gradually along with the rotation of the moving contact 20, the component force of the tension force of the spring received by the third metal shaft 80 in the direction of the sliding groove 20b increases gradually, the sliding speed of the third metal shaft 80 increases gradually until the third metal shaft 80 slides into the front circular arc structure 20a, at this time, the moving contact 20 is pulled back, but does not contact with the fixed contact 40, and the moving contact 20 is reset and can be closed again. Fig. 7 is a schematic diagram of a state before the movable contact is contacted with the fixed contact again. As shown in fig. 7, the third metal shaft 80 slides into the front circular arc structure 20a, and then pulls the moving contact 20 to reset.
The second height H2 above is higher than the first height H1.
The operating mechanism described above is well known in the art and is not described herein.
The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above examples. It is to be understood that other modifications and variations which may be directly derived or contemplated by those skilled in the art without departing from the spirit and concepts of the present invention are deemed to be included within the scope of the present invention.
Claims (1)
1. The working method of the moving contact unlocking and locking device of the circuit breaker is characterized in that the circuit breaker comprises a shell (50), a moving contact (20), a fixed contact (40), an operating mechanism (60), a rotating shaft (10) and a spring (70); the rotating shaft (10) rotates around a first metal shaft (10 b) and is arranged on the supporting plate (601); the rotating shaft (10) is connected with the operating mechanism (60) through a supporting plate (601); a bracket (10 a) is arranged in the rotating shaft (10); a shell reset boss (50 a) is arranged above the shell (50) and above the rotating shaft (10); one end of the moving contact (20) rotates around a second metal shaft (90) and is arranged on the rotating shaft (10), and the other end of the moving contact (20) is of a hook-shaped structure; a sliding groove (20 b) is formed in the moving contact (20); a third metal shaft (80) is arranged in the sliding groove (20 b); one end of the spring (70) is connected to the third metal shaft (80), and the other end is connected to the bracket (10 a);
the front end of the sliding groove (20 b) is provided with a front arc structure (20 a), and the rear end of the sliding groove (20 b) is provided with a rear arc structure (20 c);
the working method of the moving contact unlocking device of the circuit breaker comprises the following steps:
step 1, when a breaker is switched on, a moving contact (20) is contacted with a fixed contact (40); the third metal shaft (80) stays in the front circular arc structure (20 a);
step 2, a large current passes through the circuit breaker, and a moving contact (20) is separated from a fixed contact (40); the rotating shaft (10) is positioned at an initial position; the movable contact (20) drives the third metal shaft (80) to rotate in a first direction, the spring (70) is gradually lengthened and rotates around the bracket (10 a) in the first direction, meanwhile, the third metal shaft (80) slides along the sliding groove (20 b) in the direction of the backward circular arc structure (20 c) until the movable contact (20) is repelled to a first height H1, and the third metal shaft (80) slides into the backward circular arc structure (20 c);
step 3, a third metal shaft (80) stays in the rear arc structure (20 c); the moving contact (20) stops rotating and locks the current state until the operating mechanism (60) is tripped; at the moment, the height of the movable contact (20) is the first height H1;
step 4, after the operating mechanism (60) is tripped, the operating mechanism (60) drives the rotating shaft (10) to rotate in a first direction through the supporting plate (601), and the moving contact (20) follows the rotating shaft (10) to rotate; when the movable contact (20) rotates to the second height H2, the hook-shaped structure of the movable contact (20) is clamped on the shell reset boss (50 a) and stops rotating; the rotary shaft (10) continues to rotate in the first direction, and the spring (70) is gradually lengthened and rotates around the bracket (10 a) in the second direction; and the second height H2 is higher than the first height H1;
step 5, the rotating shaft (10) continues to rotate, the third metal shaft (80) slides along the sliding groove (20 b) in the direction of the front circular arc structure (20 a), the spring (70) is gradually shortened until the third metal shaft (80) slides into the front circular arc structure (20 a), the moving contact (20) is contacted with the fixed contact (40), and the moving contact (20) is reset;
the first direction is clockwise and the second direction is counterclockwise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810888022.4A CN108735557B (en) | 2018-08-07 | 2018-08-07 | Repulsion unlocking device of breaker moving contact and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810888022.4A CN108735557B (en) | 2018-08-07 | 2018-08-07 | Repulsion unlocking device of breaker moving contact and working method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108735557A CN108735557A (en) | 2018-11-02 |
| CN108735557B true CN108735557B (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810888022.4A Active CN108735557B (en) | 2018-08-07 | 2018-08-07 | Repulsion unlocking device of breaker moving contact and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108735557B (en) |
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| KR100606424B1 (en) * | 2005-01-29 | 2006-08-01 | 엘에스산전 주식회사 | A movable contactor assembly for a current limitable circuit breaker |
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| CN203386694U (en) * | 2013-07-23 | 2014-01-08 | 浙江天正电气股份有限公司 | Modular multi-polar single-breakpoint molded case circuit breaker and single breakpoint contact system thereof |
| CN203644706U (en) * | 2013-12-27 | 2014-06-11 | 常熟开关制造有限公司(原常熟开关厂） | Moving contact repulsion open tripping device for circuit breaker |
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| CN204167233U (en) * | 2014-11-24 | 2015-02-18 | 德力西电气有限公司 | Circuit breaker and fast disjunction structure and disjunction controlling organization |
| WO2017133317A1 (en) * | 2016-02-03 | 2017-08-10 | 首瑞（天津）电气设备有限公司 | Contact rotating shaft system and low-voltage switch |
| CN208521881U (en) * | 2018-08-07 | 2019-02-19 | 江苏凯隆电器有限公司 | A kind of moving contact of breaker reprimand opens locking device |
-
2018
- 2018-08-07 CN CN201810888022.4A patent/CN108735557B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100606424B1 (en) * | 2005-01-29 | 2006-08-01 | 엘에스산전 주식회사 | A movable contactor assembly for a current limitable circuit breaker |
| CN101826426A (en) * | 2010-04-16 | 2010-09-08 | 江苏辉能电气有限公司 | Contact locking device of single-breakpoint molded-case low-voltage circuit breaker |
| JP2012195185A (en) * | 2011-03-17 | 2012-10-11 | Fuji Electric Fa Components & Systems Co Ltd | Circuit breaker |
| CN203386694U (en) * | 2013-07-23 | 2014-01-08 | 浙江天正电气股份有限公司 | Modular multi-polar single-breakpoint molded case circuit breaker and single breakpoint contact system thereof |
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| CN204155886U (en) * | 2014-10-31 | 2015-02-11 | 博耳(无锡)电力成套有限公司 | Circuit breaker rotary type double-breakpoint structure of contact terminal |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108735557A (en) | 2018-11-02 |
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