CN113611550B - Quick mechanical switch for bearing large current - Google Patents
Quick mechanical switch for bearing large current Download PDFInfo
- Publication number
- CN113611550B CN113611550B CN202110851078.4A CN202110851078A CN113611550B CN 113611550 B CN113611550 B CN 113611550B CN 202110851078 A CN202110851078 A CN 202110851078A CN 113611550 B CN113611550 B CN 113611550B
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- Prior art keywords
- current lead
- annular
- contact
- mechanical switch
- insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/02—Contacts characterised by the material thereof
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/62—Heating or cooling of contacts
Abstract
The invention relates to a quick mechanical switch for carrying heavy current, which comprises an upper current lead and a lower current lead which are parallel up and down; the upper current lead comprises a current leading-out end and a connected circular metal plate, and a metal cylinder is integrally arranged below the upper current lead; the lower current lead comprises a current leading-out end and a connected annular metal plate, and a hole in the middle of the annular metal plate is used for accommodating a metal cylinder of the upper current lead; the first fixed contact is circular, and the second fixed contact is annular; an annular insulating gap is formed between the two; the movable contact is fixed on the chassis, is ring-shaped, is arranged on the metal disc and is connected with the operating mechanism through the transmission rod; when the switch is closed, the movable contact is embedded into an annular insulating gap between the two sections of fixed contacts, and the movable contact and the fixed contacts are kept in close contact by an applied external force; the operating mechanism passes through the upper cover of the outer frame of the base through the linkage rod and is connected with the metal disc.
Description
Technical Field
The invention is applied to a medium-voltage high-current power supply loop, and particularly relates to a quick mechanical switch for bearing high current.
Background
In a high-power medium-voltage alternating-current/direct-current loop, the voltage is usually lower than 20kV, and the current can reach 1-100 kA. When the power supply fails or other conditions requiring emergency bypass occur, the circuit can be effectively protected through the opening and closing actions of the quick mechanical switch.
It is a major goal of its design to increase the speed of action and current carrying capability of a mechanical switch as much as possible. And secondly, the complexity of the switch is reduced as much as possible, and the maintenance cost is reduced.
Disclosure of Invention
In order to bear large current, the contact part of the traditional mechanical switch is often huge, so that the switching-on and switching-off speed is difficult to increase. The invention aims to provide a quick mechanical switch with the capability of bearing large current.
The technical scheme of the invention is as follows: a fast mechanical switch for carrying large current comprises an upper current lead and a lower current lead which are parallel up and down; the upper current lead comprises a current leading-out end and a connected circular metal plate, and a metal cylinder is integrally arranged below the upper current lead; the lower current lead comprises a current leading-out end and a connected annular metal plate, and a hole in the middle of the annular metal plate is used for accommodating a metal cylinder of the upper current lead;
the first fixed contact and the second fixed contact are respectively connected with an upper current lead and a lower current lead; the first fixed contact is circular, and the second fixed contact is annular; an annular insulating gap is formed between the two;
the movable contact is fixed on the chassis, is ring-shaped, is arranged on the metal disc and is connected with the operating mechanism through the transmission rod. When the switch is closed, the movable contact is embedded into an annular insulating gap between the two sections of fixed contacts, and the movable contact and the fixed contacts are kept in close contact by an applied external force;
the operating mechanism passes through the upper cover of the outer frame of the base through the linkage rod and is connected with the metal disc;
furthermore, the inner insulating support and the outer insulating support are annular and form a seal with the upper current lead, and the lower current lead is also fixed on the upper cover of the base outer frame through the insulating supports; the insulating support is annular.
Further, the movable contact, the fixed contact, the insulating support, the upper cover of the outer frame of the base and the lower metal plate jointly surround to form an arc extinguishing chamber.
Furthermore, the arc-extinguishing chamber where the movable contact and the static contact are positioned is in a sealed state, and the arc-extinguishing chamber is vacuumized or filled with SF6 gas and dry nitrogen, so that the air gap and the movement stroke between the contacts are reduced.
Further, a driving coil of an electromagnetic repulsion mechanism is arranged on the upper cover of the base outer frame; the permanent magnet operating mechanism is arranged in the outer frame of the base;
further, the device is connected with the operating mechanism through a transmission rod. When the switch is closed, the movable contact is embedded between the two sections of fixed contacts, and the movable contact and the fixed contact are kept in close contact by the applied external force.
The quick mechanical switch provided by the invention at least comprises an operating mechanism, a fixed contact, a moving contact and a current lead. The current lead adopts a metal material with high conductivity and adopts a water cooling heat dissipation mode. The movable contact and the fixed contact are made of common switch contact materials, such as copper-chromium alloy and the like. The contact is subject to heat transfer by direct contact with the current lead. The movable contact adopts a circular ring shape, and has large contact area and lighter dead weight. The arc extinguishing chamber is vacuumized or filled with insulating gas commonly used in a high-voltage switch, so that the movement stroke of the contact can be reduced. The operating mechanism adopts the combination of a permanent magnet mechanism and an electromagnetic repulsion mechanism, so that the quick action can be realized.
Compared with the prior art, the invention has the beneficial effects that:
the mechanical switch provided by the invention designs the moving contact with small enough mass on the premise of meeting the current capacity of a large circuit, and further adopts electromagnetic repulsion force to be combined with a permanent magnetic operating mechanism, so that the rapid opening and closing action within 5ms under the current capacity of the large circuit can be realized. Meanwhile, the high-current load can bear hundreds of kiloamperes, the switch structure is simple, and the maintenance is convenient.
Drawings
FIG. 1 is a schematic diagram of the outline structure of the present invention;
fig. 2 is a schematic cross-sectional view of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention.
As shown in fig. 1 and 2, a fast mechanical switch for carrying a large current comprises an upper current lead 1 and a lower current lead 2 which are parallel up and down. The current lead is made of metal with higher electric conductivity and thermal conductivity, such as pure aluminum or red copper. The upper current lead comprises a current leading-out end and a connected circular metal plate, and a metal cylinder is integrally arranged below the upper current lead; the lower current lead comprises a current leading-out end and a connected annular metal plate, and a hole in the middle of the annular metal plate is used for accommodating a metal cylinder of the upper current lead;
the upper and lower current leads are connected to an external circulating cooling water path through a water pipe interface 4, and water cooling is adopted for heat dissipation. The upper current lead and the lower current lead are fixed through an inner insulating support 5 and an outer insulating support 6; the inner insulating support 5 and the outer insulating support 6 are annular, and form a seal with the upper current lead, and the lower current lead 2 is also fixed on the upper cover of the base outer frame 3 through the insulating support 7. The insulating support 7 is annular;
the first fixed contact 8 and the second fixed contact 9 are respectively connected with an upper current lead and a lower current lead; the first fixed contact 8 is circular, and the second fixed contact 9 is annular; an annular insulating gap is formed between the two;
the movable contact 10 is annular and is arranged on the metal disc 11 and is connected with the operating mechanism through a transmission rod. When the switch is closed, the movable contact is embedded into an annular insulating gap between the two sections of fixed contacts, and the movable contact and the fixed contact are kept in close contact by an applied external force.
12 is a driving coil of an electromagnetic repulsion mechanism, 13 is a linkage rod, and 14 is a permanent magnet operating mechanism. The movable contact, the fixed contact, the insulating support, the base outer frame and the lower metal plate jointly surround to form an arc extinguishing chamber 15.
The permanent magnet operating mechanism 14 passes through the upper cover of the base outer frame 3 through the linkage rod 13 and is connected with the metal disc 11; a driving coil 12 of an electromagnetic repulsion mechanism is arranged on the upper cover of the base outer frame 3; the permanent magnet operating mechanism 14 is arranged in the base outer frame 3;
in the technical scheme of the invention, the operating mechanism is arranged in the base, and the upper current lead and the lower current lead are fixed on the base through insulating supports and adopt water cooling for heat dissipation. The fixed contact is directly connected and fixed with the current lead, the moving contact is connected with the operating mechanism, and the size of the moving contact can be set according to the rated load current. And the arc extinguishing chamber can be vacuumized according to actual needs or filled with SF6 gas, dry nitrogen and the like, so that the air gap and the movement stroke between the contacts are reduced.
The foregoing is merely a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the invention, and such alternatives and modifications are intended to fall within the scope of the invention.
Claims (5)
1. A fast mechanical switch carrying a large current, characterized by: comprises an upper current lead and a lower current lead which are parallel up and down; the upper current lead and the lower current lead are fixed through an inner insulating support and an outer insulating support; the lower current lead is also fixed on an upper cover of the outer frame of the base through another insulating support; the upper current lead comprises a current leading-out end and a connected circular metal plate, and a metal cylinder is integrally arranged below the upper current lead; the lower current lead comprises a current leading-out end and a connected annular metal plate, and a hole in the middle of the annular metal plate is used for accommodating a metal cylinder of the upper current lead;
the first fixed contact and the second fixed contact are respectively connected with an upper current lead and a lower current lead; the first fixed contact is circular, and the second fixed contact is annular; an annular insulating gap is formed between the two;
the movable contact is in a ring shape and is arranged on the metal disc, and is connected with the permanent magnet operating mechanism through a transmission rod;
the permanent magnet operating mechanism passes through the upper cover of the outer frame of the base through the linkage rod and is connected with the metal disc.
2. A fast mechanical switch carrying high currents according to claim 1, wherein:
the inner insulating support and the outer insulating support are annular and form a seal with the upper current lead; the further insulating support is annular.
3. A fast mechanical switch carrying high currents according to claim 1, wherein: and the movable contact, the fixed contact, the other insulating support, the upper cover of the outer frame of the base and the annular metal plate jointly surround to form an arc extinguishing chamber.
4. A fast mechanical switch carrying high currents according to claim 3, wherein:
the arc extinguishing chamber where the moving contact and the static contact are positioned is in a sealing state, and the arc extinguishing chamber is vacuumized or filled with SF6 gas and dry nitrogen.
5. A fast mechanical switch carrying high currents according to claim 1, wherein:
a driving coil of an electromagnetic repulsion mechanism is arranged on the upper cover of the base outer frame; the permanent magnet operating mechanism is arranged in the outer frame of the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110851078.4A CN113611550B (en) | 2021-07-27 | 2021-07-27 | Quick mechanical switch for bearing large current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110851078.4A CN113611550B (en) | 2021-07-27 | 2021-07-27 | Quick mechanical switch for bearing large current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113611550A CN113611550A (en) | 2021-11-05 |
| CN113611550B true CN113611550B (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110851078.4A Active CN113611550B (en) | 2021-07-27 | 2021-07-27 | Quick mechanical switch for bearing large current |
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| Country | Link |
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| CN (1) | CN113611550B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115172095B (en) * | 2022-09-02 | 2023-03-24 | 清华大学 | Multi-contact arc extinguish chamber structure |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008123959A (en) * | 2006-11-15 | 2008-05-29 | Wako Denshi Kk | Pressure switch, and thermostat |
| CN102157297A (en) * | 2011-03-09 | 2011-08-17 | 西安森源开关技术研究所有限公司 | Three-station vacuum switch tube |
| DE102012005031A1 (en) * | 2011-07-07 | 2013-01-10 | Abb Ag | Service switching device e.g. fault current limiter, has contact apparatuses which are provided in interior of pressure-resistant chamber so that pressure inside the pressure-tight chamber is raised to extinguish the generated arc |
| EP2665077A1 (en) * | 2012-05-14 | 2013-11-20 | ABB Technology AG | High current switching device |
| CN203895352U (en) * | 2014-05-30 | 2014-10-22 | 国家电网公司 | Vacuum arc-extinguishing chamber with switching-on self-keeping function |
| DE102014108518A1 (en) * | 2014-06-17 | 2015-12-17 | Thermik Gerätebau GmbH | Temperature-dependent switch with spacer ring |
| CN205050723U (en) * | 2015-10-21 | 2016-02-24 | 国网智能电网研究院 | Quick mechanical switch |
| CN109637852A (en) * | 2018-11-02 | 2019-04-16 | 中国科学院合肥物质科学研究院 | Three-level structure of contact terminal mechanical switch for large power all-controlled mixed style direct current switch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4003492B2 (en) * | 2002-03-14 | 2007-11-07 | 株式会社日立製作所 | Current collector |
-
2021
- 2021-07-27 CN CN202110851078.4A patent/CN113611550B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008123959A (en) * | 2006-11-15 | 2008-05-29 | Wako Denshi Kk | Pressure switch, and thermostat |
| CN102157297A (en) * | 2011-03-09 | 2011-08-17 | 西安森源开关技术研究所有限公司 | Three-station vacuum switch tube |
| DE102012005031A1 (en) * | 2011-07-07 | 2013-01-10 | Abb Ag | Service switching device e.g. fault current limiter, has contact apparatuses which are provided in interior of pressure-resistant chamber so that pressure inside the pressure-tight chamber is raised to extinguish the generated arc |
| EP2665077A1 (en) * | 2012-05-14 | 2013-11-20 | ABB Technology AG | High current switching device |
| CN203895352U (en) * | 2014-05-30 | 2014-10-22 | 国家电网公司 | Vacuum arc-extinguishing chamber with switching-on self-keeping function |
| DE102014108518A1 (en) * | 2014-06-17 | 2015-12-17 | Thermik Gerätebau GmbH | Temperature-dependent switch with spacer ring |
| CN205050723U (en) * | 2015-10-21 | 2016-02-24 | 国网智能电网研究院 | Quick mechanical switch |
| CN109637852A (en) * | 2018-11-02 | 2019-04-16 | 中国科学院合肥物质科学研究院 | Three-level structure of contact terminal mechanical switch for large power all-controlled mixed style direct current switch |
Non-Patent Citations (2)
| Title |
|---|
| 基于超程时间回归模型的继电器 寿命预测方法;李华等;《电工技术学报》;第28卷(第2期);第414-422页 * |
| 新型手车式大电流真空断路器动静触头电场分析与仿真;叶露;李婷婷;王晓智;王爱武;张纯军;;电工技术(第11期);第71-73页 * |
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| Publication number | Publication date |
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| CN113611550A (en) | 2021-11-05 |
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