阅读说明：本技术 一种承载大电流的快速机械开关 (Fast mechanical switch for bearing large current ) 是由 李华 胡星光 宋执权 徐猛 张�杰 于 2021-07-27 设计创作，主要内容包括：本发明涉及一种承载大电流的快速机械开关,包括有上下平行的上电流引线和下电流引线；上电流引线包括电流引出端、以及相连的一圆形金属板,其下方一体连接设置有金属圆柱体；所述下电流引线包括电流引出端,以及相连的环形金属板,所述环形金属板中间的孔用于容纳上电流引线的金属圆柱体；所述的第一静触头为圆形,第二静触头为环形；两者之间形成环形的绝缘缝隙；动触头固定于底盘上,所述动触头为圆环状,安装于金属圆盘上,通过传动杆与操动机构相连；开关闭合时,动触头嵌入两段静触头之间的环形的绝缘缝隙,动、静触头之间由施加的外力保持紧密接触；操作机构通过连动杆穿过底座外框的上盖与金属圆盘相连接。(The invention relates to a quick mechanical switch for bearing 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 circular metal plate which is connected with the current leading-out end, and a metal cylinder is integrally connected and arranged below the upper current lead; the lower current lead comprises a current leading-out end and an annular metal plate connected with the current leading-out end, 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 moving contact is fixed on the chassis, is annular, is arranged on the metal disc and is connected with the operating mechanism through the transmission rod; when the switch is closed, the moving contact is embedded into an annular insulating gap between the two sections of static contacts, and the moving contact and the static 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.)

1. A fast mechanical switch for carrying large current is characterized in that: 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 circular metal plate which is connected with the current leading-out end, and a metal cylinder is integrally connected and arranged below the upper current lead; the lower current lead comprises a current leading-out end and an annular metal plate connected with the current leading-out end, 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 static contact and the second static contact are respectively connected with the upper current lead and the 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 moving contact is fixed on the chassis, is annular, is installed on the metal disc, and is connected with the operating mechanism through the transmission rod. When the switch is closed, the moving contact is embedded into an annular insulating gap between the two sections of static contacts, and the moving contact and the static 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.

2. A high current carrying fast mechanical switch according to claim 1, wherein:

the inner side insulating support and the outer side insulating support are both annular and form sealing with the upper current lead, and the lower current lead is also fixed on an upper cover of the outer frame of the base through the insulating supports; the insulating support is annular.

3. A high current carrying fast mechanical switch according to claim 1, wherein: the movable contact, the fixed contact, the insulating support, the upper cover of the outer frame of the base and the lower metal plate are jointly surrounded to form an arc extinguish chamber.

4. A high current carrying fast mechanical switch according to claim 1, wherein:

the arc extinguish chamber where the moving contact and the static contact are located is in a sealed state, and the arc extinguish chamber is vacuumized or filled with SF6 gas and dry nitrogen.

5. A high current carrying fast mechanical switch according to claim 1, wherein:

a driving coil of the electromagnetic repulsion mechanism is arranged on the upper cover of the base outer frame; the permanent magnet operating mechanism is arranged in the base outer frame.

6. A high current carrying fast mechanical switch according to claim 1, wherein:

is connected with the operating mechanism through a transmission rod. When the switch is closed, the moving contact is embedded between the two sections of static contacts, and the moving contact and the static contacts are kept in close contact by an applied external force.

Technical Field

The invention is applied to a power supply loop of medium-voltage large current, and particularly relates to a quick mechanical switch for bearing large current.

Background

In a high-power medium-voltage alternating current and direct current loop, the voltage is usually lower than 20kV, and the current can reach 1-100 kA. When a power supply fails or other conditions needing emergency bypass occur, effective protection of the circuit can be achieved through opening and closing actions of the quick mechanical switch.

It is a major goal of its design to increase the speed of action and the current carrying capacity of the mechanical switch as much as possible. 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 existing mechanical switch is always larger, so that the opening and closing speed is difficult to increase. The invention aims to provide a quick mechanical switch with the capacity of bearing large current.

The technical scheme of the invention is as follows: a fast mechanical switch bearing 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 circular metal plate which is connected with the current leading-out end, and a metal cylinder is integrally connected and arranged below the upper current lead; the lower current lead comprises a current leading-out end and an annular metal plate connected with the current leading-out end, 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 static contact and the second static contact are respectively connected with the upper current lead and the 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 moving contact is fixed on the chassis, is annular, is installed on the metal disc, and is connected with the operating mechanism through the transmission rod. When the switch is closed, the moving contact is embedded into an annular insulating gap between the two sections of static contacts, and the moving contact and the static 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 side insulating support and the outer side insulating support are both annular and are sealed with the upper current lead, and the lower current lead is also fixed on an upper cover of the outer frame of the base through the insulating supports; the insulating support is annular.

Furthermore, the movable contact, the fixed contact, the insulating support, the upper cover of the outer frame of the base and the lower metal plate are jointly surrounded to form an arc extinguish chamber.

Furthermore, the arc extinguish chamber where the moving contact and the static contact are located is in a sealed state, the arc extinguish chamber is vacuumized, or SF6 gas and dry nitrogen gas are filled in the arc extinguish chamber, and therefore the air gap and the movement stroke between the contacts are reduced.

Furthermore, a driving coil of an electromagnetic repulsion mechanism is arranged on the upper cover of the outer frame of the base; the permanent magnet operating mechanism is arranged in the outer frame of the base;

furthermore, the operating mechanism is connected with the driving rod. When the switch is closed, the moving contact is embedded between the two sections of static contacts, and the moving contact and the static contacts are kept in close contact by an applied external force.

The quick mechanical switch at least comprises an operating mechanism, a fixed contact, a movable contact and an in-out current lead. The current lead is made of high-conductivity metal materials and adopts a water-cooling heat dissipation mode. The moving contact and the static contact are made of common switch contact materials, such as copper-chromium alloy and the like. The contacts rely on direct contact with the current leads for heat conduction and dissipation. The moving contact adopts the ring form, and area of contact is big, and the dead weight is lighter. The arc extinguish chamber is vacuumized or filled with the commonly used insulating gas in the high-voltage switch, so that the motion stroke of the contact can be reduced. The operating mechanism adopts the combination of a permanent magnetic mechanism and an electromagnetic repulsion mechanism, and can realize quick action.

Compared with the prior art, the invention has the beneficial effects that:

the mechanical switch provided by the invention is provided with the moving contact with enough small mass on the premise of meeting the through-current capacity of a large circuit, and further adopts the electromagnetic repulsion force to be combined with the permanent magnet operating mechanism, so that the rapid opening and closing action within 5ms under the condition of high current can be realized. Meanwhile, the high-current switch can bear hundreds of thousands of amperes of high current, and is simple in structure and convenient to maintain.

Drawings

FIG. 1 is a schematic view 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 is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention.

As shown in fig. 1 and 2, a fast mechanical switch for carrying large current includes an upper current lead 1 and a lower current lead 2 which are parallel up and down. The current lead wire is made of metal having high electrical and thermal conductivity, such as pure aluminum or red copper. The upper current lead comprises a current leading-out end and a circular metal plate which is connected with the current leading-out end, and a metal cylinder is integrally connected and arranged below the upper current lead; the lower current lead comprises a current leading-out end and an annular metal plate connected with the current leading-out end, 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 current lead and the lower current lead are connected into an external circulating cooling water path through a water pipe connector 4 and are cooled by water. The upper current lead and the lower current lead are fixed through an inner side insulating support 5 and an outer side insulating support 6; the inner side insulating support 5 and the outer side insulating support 6 are both annular and form sealing 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 static contact 8 and the second static 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 moving contact 10 is annular, is arranged on the metal disc 11, and is connected with the operating mechanism through a transmission rod. When the switch is closed, the moving contact is embedded into an annular insulating gap between the two sections of the static contacts, and the moving contact and the static contacts are kept in tight contact by applied external force.

12 is a driving coil of the electromagnetic repulsion mechanism, 13 is a linkage rod, and 14 is a permanent magnetic operating mechanism. The movable contact, the fixed contact, the insulating support, the base outer frame and the lower metal plate are jointly surrounded to form an arc extinguish 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, the upper current lead and the lower current lead are fixed on the base through the insulating supports, and water cooling is adopted. The static 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 size of rated bearing current. And the arc extinguish chamber can be vacuumized or filled with SF6 gas, dry nitrogen and the like according to actual needs, so that the air gap and the movement stroke between the contacts are reduced.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and these examples are only for illustrative purpose 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 devised by those skilled in the art without departing from the scope of the invention, and these alternatives and modifications are intended to fall within the scope of the invention.