CN111489901A - Operating mechanism for circuit breaker - Google Patents
Operating mechanism for circuit breaker Download PDFInfo
- Publication number
- CN111489901A CN111489901A CN202010291535.4A CN202010291535A CN111489901A CN 111489901 A CN111489901 A CN 111489901A CN 202010291535 A CN202010291535 A CN 202010291535A CN 111489901 A CN111489901 A CN 111489901A
- Authority
- CN
- China
- Prior art keywords
- end cover
- magnetic coil
- permanent magnet
- operating mechanism
- 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.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/28—Power arrangements internal to the switch for operating the driving mechanism using electromagnet
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- 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
- H01H71/24—Electromagnetic mechanisms
- H01H71/32—Electromagnetic mechanisms having permanently magnetised part
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- 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
- H01H71/24—Electromagnetic mechanisms
- H01H71/32—Electromagnetic mechanisms having permanently magnetised part
- H01H71/325—Housings, assembly or disposition of different elements in the housing
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention discloses an operating mechanism for a circuit breaker, which comprises a shell and a guide rod, wherein an upper end cover is fixed at the upper end of the shell, a lower end cover is fixed at the lower end of the shell, the upper end cover, the shell and the lower end cover form a cavity, a magnetic coil is arranged in the cavity, a permanent magnet is arranged above the magnetic coil, the permanent magnets arranged above the magnetic coil are all circular columns, an electromagnetic moving iron is arranged in the magnetic coil and the permanent magnet, the guide rod sequentially penetrates through the upper end cover, the electromagnetic moving iron and the lower end cover, and the guide rod is fixedly connected with the electromagnetic moving. The operating mechanism has the characteristics of simple structure, convenience in operation and maintenance, no misoperation of the circuit breaker, clean opening and closing actions, stable contact pressure and holding force, high opening speed, stable holding force and the like. The circuit breaker can be widely used for various types of circuit breakers, in particular to trains running on high-speed rails and urban rails. The method has the advantages that the opening speed is high, the rigid time is controlled within 1.5ms, the hidden danger of a plurality of circuit breakers is avoided, and the safety guarantee in the aspect of electrical is improved.
Description
Technical Field
The invention belongs to the technical field of opening and closing switches, and particularly relates to a magnetic mechanism for high-speed opening.
Background
The circuit breaker is a conventional component of an electric line, and a high-speed circuit breaker is widely used in many fields with excellent characteristics, particularly in the direction of safe and reliable performance.
The traditional circuit breaker mostly adopts a spring structure as an energy storage device of an operating mechanism, but the spring structure brings many disadvantages, such as fatigue of closing, weakening of stored energy, misoperation, relatively complex structure, low closing and opening speed and the like. According to the above disadvantages, it is often difficult to combine the technical requirements of high-speed switching on and off and reliable stability.
Disclosure of Invention
The invention provides an operating mechanism for a circuit breaker, which aims to solve the problem that the switching-on and switching-off speed of the operating mechanism is low.
In order to achieve the purpose, the operating mechanism for the circuit breaker comprises a shell and a guide rod, wherein an upper end cover is fixed at the upper end of the shell, a lower end cover is fixed at the lower end of the shell, a cavity is formed by the upper end cover, the shell and the lower end cover, a magnetic coil is arranged in the cavity, a permanent magnet is arranged above the magnetic coil, the permanent magnets arranged above the magnetic coil are all circular columns, an electromagnetic moving iron is arranged in the magnetic coil and the permanent magnet, the guide rod sequentially penetrates through the upper end cover, the electromagnetic moving iron and the lower end cover, and the guide rod is fixedly connected with the electromagnetic moving iron.
Furthermore, the upper ends of the permanent magnet and the inner magnetic ring are provided with magnetic isolating rings.
Furthermore, a circular upper boss is arranged in the upper end cover, a circular lower boss is arranged on the inner side of the lower end cover, and the radiuses of the upper boss and the lower boss are the same as the inner diameter of the magnetic coil.
Furthermore, a plurality of grooves are formed in the outer surface of the side wall of the electromagnet along the circumferential direction.
Furthermore, the groove depth is 1mm-2mm, and the width is 1mm-2 mm.
Further, the upper end of the permanent magnet is provided with a chamfer angle of 40-90 degrees.
Furthermore, the air gap between the electromagnet and the magnetic coil is less than or equal to 0.15 mm.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the magnetic coil is electrified to accord with the ampere law and the right-hand law, the magnetic coil generates a magnetic field, the electromagnet in the magnetic coil rapidly generates magnetic fields of N poles and S poles at the upper end and the lower end of the electromagnet, and the electromagnet moves linearly in the magnetic coil. If the direction of current input by the magnetic coil is changed, the electromagnet moves reversely, which conforms to the ampere law. When the input current is cut off, the moving electromagnet stops at a certain position, the permanent magnet arranged in the shell is sleeved outside the electromagnet, the electromagnet is attracted to a certain fixed point by the magnetic force generated by the permanent magnet and the end cover, and thus a switching-off state is formed, otherwise, a switching-on state is formed. If the current direction is changed, the above actions are repeated in the reverse direction, and one switching-on or switching-off action is completed. The distribution of the magnetic force in the circular shell of the permanent magnet is transferred along with the moving direction of the electromagnet, for example, when the electromagnet moves to the contact surface from the upper end cover, the magnetic force direction of the permanent magnet is transferred along the direction of the boss on the upper end surface of the inner side of the shell to generate magnetic force to attract and fix the electromagnet; on the contrary, the electromagnet is electrified through the magnetic coil to generate a magnetic field, when the electromagnet moves to the lower end cover to a protruding stop point of the lower end cover, the magnetic line of force of the annular permanent magnet in the shell can move downwards to the lower end cover, the magnetic force generated by the lower end cover adsorbs the fixing action and completes the opening and closing movement once again, the whole magnetic circuit forms a closed-loop magnetic circuit, and the opening and closing pressure and the holding force are increased. The control system triggers the operating mechanism to complete the breaker or switch by giving a control signal to the magnetic coil, so that various electrical performance indexes are realized, and the switching-on and switching-off speeds can reach 1-2 ms.
Furthermore, a circular upper boss is arranged in the upper end cover, a circular lower boss is arranged on the inner side of the lower end cover, the radiuses of the upper boss and the lower boss are the same as the inner diameter of the magnetic coil, and the upper boss and the lower boss are used for gathering magnetism in the magnetic force conduction direction of the permanent magnet.
Furthermore, a plurality of grooves are formed in the outer surface of the side wall of the electromagnet to cut off eddy current formed by the electromagnet, dredge compressed air generated by movement of the circular electromagnet and improve closing speed.
Furthermore, the upper end of the permanent magnet is provided with a cutting angle of 40-90 degrees, which is beneficial to increasing the contact surface and further increasing the magnetic circuit area.
Furthermore, the air gap between the electromagnet and the magnetic coil is less than or equal to 0.15mm, so that the instability of the electromagnet is avoided, and the magnetic leakage is reduced.
Drawings
Fig. 1 is a sectional view of an operating mechanism for a circuit breaker.
Fig. 2 is an exploded view of an operating mechanism for a circuit breaker.
In the drawings: 1-a guide rod; 2-upper end cover; 3-magnetism isolating ring; 4-an inner magnetic ring; 5-a permanent magnet; 6-a shell; 7-electromagnet; 8-a magnetic coil; 9-lower end cover, 10-magnetic coil outlet hole.
Detailed Description
In order to make the objects and technical solutions of the present invention clearer and easier to understand. The present invention will be described in further detail with reference to the following drawings and examples, wherein the specific examples are provided for illustrative purposes only and are not intended to limit the present invention.
Referring to fig. 1 and 2, an operating mechanism for a circuit breaker includes a guide bar 1; an upper end cover 2; a magnetism isolating ring 3; an inner magnetic ring 4; a rare earth permanent magnet 5; a housing 6; an electromagnet 7; a magnetic coil 8; an upper boss with the same inner diameter as the magnetic coil 8 is arranged in the upper end cover 2 of the lower end cover 9, a lower boss is arranged on the inner side of the lower end cover 9, and the upper boss and the lower boss are used for magnetic force gathering in the magnetic force conduction direction of the permanent magnet 5. Wherein, the upper end cover, the lower end cover 9 and the electromagnet 7 are all made of magnetic conductive materials.
The magnetic coil 8 is arranged in the shell 6, 1/3 at the lower part of the magnetic coil 8 is sleeved on the lower boss, the permanent magnet 5 is superposed on the magnetic coil 8, a circular magnet consisting of four permanent magnets 5 is arranged in the inner magnetic ring 4, and the inner magnetic ring 4 is used for fixing the permanent magnet 5 and realizing the effect of uniform magnetic force lines. The magnetism isolating ring 3 is positioned between the upper end surface of the permanent magnet 5 and the lower end surface of the upper end cover 2.
The electromagnet 7 is cylindrical, two grooves with the depth of 1mm-2mm and the width of 1mm-2mm are respectively machined on the outer side of the side wall of the electromagnet 7 along the circumferential direction, and the grooves are used for cutting off eddy currents formed by the electromagnet 7, dredging compressed air generated by the movement of the circular electromagnet 5 and improving the closing speed.
The material of permanent magnet 5 is rare earth permanent magnet, casing 6 is cylindrical, and lower end cover 9 threaded connection, magnetic line of force circle exit hole 10 has been seted up to casing 6 lateral wall, the annular permanent magnet 5 that magnetic coil 8 and polylith magnetic element are constituteed is equipped with in casing 6, permanent magnet 5 and interior magnetic ring 4 are arranged in casing 6 with the internal diameter stack together, guide arm 1 is fixed as an organic whole with electromagnetism moving iron 7 concentric shaft, go up the boss and insert in the 4 magnetic coil of interior magnetic ring and with casing 6 fixed connection, the guide arm is worn out from the hole of upper end cover 2, lower end cover 9 sets up 7 outer ends of permanent magnet in casing 6, the guide arm is drawn forth in lower end cover 9 holes.
The permanent magnet 5 is a radial core magnet and consists of a plurality of annular magnetic elements, and the upper end of each magnetic element is provided with a cutting angle of 40-90 degrees, so that the contact surface is increased, and the magnetic circuit area is increased.
In the structure, the air gap between the electromagnet 7 and the magnetic coil 8 is less than or equal to 0.15 mm. So as to avoid the instability of the electromagnetic moving iron and reduce the magnetic leakage.
The operating mechanism has the following working principle:
in a static state, the structure is in a single-end closing state, namely the electromagnet 7 and any one of the upper end cover 2 or the lower end cover 9 are closed, and the other end is opened. After the magnetic coil 8 is electrified, the magnetic coil generates a magnetic field, the electromagnet 7 in the magnetic coil 8 makes axial linear motion, the direction of the electromagnet 7 is changed by the change of the direction of the power supply current, and the required motion direction can be adjusted by adjusting the direction of the current.
The magnetic force of the permanent magnet in the structure is static waiting magnetic force, when the electromagnet 7 in fig. 2 moves upwards to the upper end cover 2, the permanent magnet 5 transmits the magnetic force to the upper boss and the lower boss of the upper end cover 2 along the inner side of the shell 6, the polarities of the upper boss and the lower boss are always the same, the electromagnet 7 is positioned by attracting the magnetic force, the outer diameter of the electromagnet 7 is sleeved in the inner hole of the permanent magnet 5, the inner side of the permanent magnet 5 is S pole, and the outer side of the permanent magnet 5 is N pole; the outer surface of the electromagnet 7 is attracted with the inner surface of the permanent magnet 5, so that the phenomenon of single-pole attraction of the conventional permanent magnet is avoided, and the attraction force of the electromagnet is increased, namely the pressure and the holding force act simultaneously.
The electromagnet 7 and the magnetic coil 8 in fig. 2 are in a dynamic trend, at the moment of electrification, an N pole and an S pole are respectively generated on the upper surface and the lower surface of the electromagnet 7, at this time, if the lower end cover 9 of the electromagnet is the S pole, the upper end cover 2 is also the S pole, the electromagnet 7 can rapidly move towards the upper end cover 2, because the lower end of the electromagnet 7 is the S pole, the lower end cover 9 of the S pole is repulsive, the S pole of the upper end cover 2 and the end surface of the electromagnet 7 generate the N pole, opposite attraction is generated, the electromagnet 7 rapidly moves upwards in the magnetic coil 8 and the permanent magnet 5, the upper boss surface is stopped, one-time brake-separating action is completed, and by analogy, the magnetic mechanism reciprocates, and the structure is formed by combining the dynamic electromagnet 7 and the static permanent magnet 5.
The operating mechanism has the characteristics of simple structure, convenience in operation and maintenance, no misoperation of the circuit breaker, clean opening and closing actions, stable contact pressure and holding force, high opening speed, stable holding force and the like. The linear motion of the moving iron of the mechanism is changed by changing the power supply direction of the magnetic coil, so that the opening and closing kinetic energy of the circuit breaker is realized. The magnetic operating mechanism is a bistable and double-holding magnetic and electromagnetic operating mechanism with high-speed motion, and can be widely used for various circuit breakers, in particular to trains running on high-speed rails and urban rails. The method has the advantages that the opening speed is high, the rigid time is controlled within 1.5ms, the hidden danger of a plurality of circuit breakers is avoided, and the safety guarantee in the aspect of electrical is improved.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. The utility model provides an operating mechanism for circuit breaker, its characterized in that includes casing (6) and guide arm (1), and casing (6) upper end is fixed with upper end cover (2), and the lower extreme is fixed with lower end cover (9), and upper end cover (2), casing (6) and lower end cover (9) form the cavity, be provided with magnetic coil (8) in the cavity, magnetic coil (8) top is provided with permanent magnet (5), and magnetic coil (8) and permanent magnet (5) are the ring post, are provided with electromagnetism movable iron (7) in magnetic coil (8) and permanent magnet (5), and upper end cover (2), electromagnetism movable iron (7) and lower end cover (9) are passed in proper order in guide arm (1), guide arm (1) and electromagnetism movable iron (7) fixed connection.
2. An operating mechanism for a circuit breaker according to claim 1, characterized in that the permanent magnet (5) and the inner magnetic ring (4) are provided with a magnetic isolating ring (3) at the upper end.
3. The operating mechanism for the circuit breaker according to claim 1, wherein the upper cover (2) is provided with a circular upper boss, the lower cover (9) is provided with a circular lower boss, and the radius of the upper boss and the radius of the lower boss are the same as the inner diameter of the magnetic coil (8).
4. The operating mechanism for the circuit breaker according to claim 1, wherein the electromagnetic moving iron (7) has a plurality of grooves formed on the outer surface of the sidewall along the circumferential direction.
5. The operating mechanism of claim 4, wherein the groove has a depth of 1mm to 2mm and a width of 1mm to 2 mm.
6. An operating mechanism for a circuit breaker according to claim 1 characterised in that the upper end of the permanent magnet (5) has a chamfer with an angle of 40 ° to 90 °.
7. The operating mechanism for the circuit breaker according to claim 1, wherein the air gap between the electromagnet (7) and the magnetic coil (8) is less than or equal to 0.15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010291535.4A CN111489901A (en) | 2020-04-14 | 2020-04-14 | Operating mechanism for circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010291535.4A CN111489901A (en) | 2020-04-14 | 2020-04-14 | Operating mechanism for circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111489901A true CN111489901A (en) | 2020-08-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010291535.4A Pending CN111489901A (en) | 2020-04-14 | 2020-04-14 | Operating mechanism for circuit breaker |
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| Country | Link |
|---|---|
| CN (1) | CN111489901A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114388314A (en) * | 2021-12-24 | 2022-04-22 | 上海京硅智能技术有限公司 | Circuit breaker control system |
-
2020
- 2020-04-14 CN CN202010291535.4A patent/CN111489901A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114388314A (en) * | 2021-12-24 | 2022-04-22 | 上海京硅智能技术有限公司 | Circuit breaker control system |
| CN114388314B (en) * | 2021-12-24 | 2024-03-12 | 上海京硅智能技术有限公司 | Circuit breaker control system |
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