阅读说明：本技术 一种静触头和开关装置 (Static contact and switch device ) 是由 李怡然 陈石川 林团 南寅 沈迪 王文涛 任庆庆 刘万里 周健 张晓璟 李超 于 2020-05-26 设计创作，主要内容包括：本发明公开了一种静触头和应用该静触头的开关装置,所述开关装置包括绝缘外壳、电源接线端、动触头和静触头,所述静触头包括第一静触头和第二静触头,所述第二静触头沿开关装置的宽度方向设于第一静触头的一侧,且通过电阻体与开关装置的电源接线端电连接。本发明通过与低阻电路并列设置另一路高阻电路,由低阻电路承载正常工作电流,在分断电流产生电弧时由高阻电路降低电流从而减小电弧能量,最大程度地保护触头。(The invention discloses a static contact and a switch device applying the same, wherein the switch device comprises an insulating shell, a power supply wiring terminal, a moving contact and a static contact, the static contact comprises a first static contact and a second static contact, and the second static contact is arranged on one side of the first static contact along the width direction of the switch device and is electrically connected with the power supply wiring terminal of the switch device through a resistor body. The invention arranges another high resistance circuit in parallel with the low resistance circuit, the low resistance circuit carries normal working current, when the breaking current generates arc, the high resistance circuit reduces the current, thereby reducing the energy of the arc and protecting the contact to the maximum extent.)

1. The fixed contact (150) is characterized by comprising a first fixed contact (151) and a second fixed contact (152), wherein the second fixed contact (152) is arranged on one side of the first fixed contact (151) along the width direction of a switch device (10) and is electrically connected with a power supply terminal of the switch device (10) through a first resistor body (110).

2. The fixed contact (150) as claimed in claim 1, further comprising a third fixed contact (153), wherein the third fixed contact (153) and the second fixed contact (152) are disposed on the other side of the first fixed contact (151) and electrically connected to the power terminal of the switch device (10) through the first resistor (110) or the second resistor.

3. The stationary contact (150) as claimed in claim 2, wherein the ends of the second stationary contact (152) and the third stationary contact (153) close to the movable contact (140) are respectively insulated from the ends of the first stationary contact (151) close to the movable contact (140).

4. The stationary contact (150) according to claim 2, wherein the second stationary contact (152) or the third stationary contact (153) is in contact with the movable contact (140) before the first stationary contact (151) and is disconnected from the first stationary contact (151).

5. A stationary contact (150) as claimed in claim 2, wherein: the second fixed contact (152) and the third fixed contact (153) are arranged integrally or separately at the ends far away from the movable contact (140).

6. A stationary contact (150) according to claim 1 or 2, characterized in that: the first resistor body (110) or the second resistor body is made of one or more of iron-chromium-aluminum, iron-nickel-aluminum, nickel-chromium, constantan or manganin materials.

7. A switching device (10) comprising an insulating casing (100), a mains connection terminal, a movable contact (140) and a stationary contact (150) according to any one of claims 1 to 6.

8. A switching device (10) according to claim 7, characterized in that: the moving contact (140) is of a single-breakpoint type or a double-breakpoint type.

9. A switching device (10) according to claim 8, characterized in that: the moving contact (140) is of a double-breakpoint type, and the switch device (10) further comprises a switching static contact (154).

10. A switching device (10) according to claim 9, characterized in that: the width of the end part of the switching static contact (154) close to the movable contact (140) is smaller than the sum of the widths of the end parts of the first static contact (151) and the second static contact (152) or the third static contact (153) close to the movable contact (140).

11. A switching device (10) according to claim 7 or 9, characterized in that: at least one arc extinguish chamber (190) is arranged between the switching static contact (154) and the moving contact (140).

12. A switching device (10) according to claim 7, characterized in that: and an insulating sheet (155) is further arranged on the moving contact (140), the first fixed contact (151), the second fixed contact (152) and/or the third fixed contact (153).

13. A switching device (10) according to claim 7 or 9, characterized in that: the switching device (10) is a circuit breaker, an automatic transfer switch or a phase change transfer switch.

14. A switching device (10) according to claim 13, wherein: the static contacts (150) are one group, two groups or three groups.

Technical Field

The invention relates to the field of low-voltage electrical appliances, in particular to a static contact and a switch device.

Background

In the industry of low-voltage electrical appliances, because of the existence of resistive load, inductive load, capacitive load and hybrid load in the load, when each load is started or cut off, an impact current larger than a rated current exists, for example, overload impact of several times of the rated current is brought to the low-voltage electrical appliances such as terminal electrical appliances or distribution electrical appliances when the load is started or cut off, and for example, impact of tens of times of short-circuit current is brought to the terminal electrical appliances or the distribution electrical appliances when the load is in fault short circuit. The electric arcs can occur in both overload current impact and short-circuit current impact, the copper-based contacts carrying current are burnt or welded by the electric arcs, and the circuits cannot be connected or cut off, so that electrical accidents are caused; in the existing low-voltage electrical appliance designs, various measures are taken to prevent the electrical appliance from being damaged by the arc during the life cycle, such as:

1. a silver-based contact is adopted on the copper-based contact to bear electric arc burning loss and resist welding;

2. an iron-based arc-extinguishing grid plate is adopted to cut and cool electric arcs, so that the burning loss of a contact is reduced;

3. the current limiting mode is adopted, namely, the circuit with a higher resistance value of another loop is switched to when the large current is disconnected, so that the circuit current is reduced, the size of an electric arc is reduced, and the burning loss of a contact is weakened.

With the continuous development of the industry, the requirements on the electrical service life of a low-voltage apparatus are higher and higher due to the requirements on redundancy and reliability, the arc energy is not substantially reduced by the above modes 1 and 2, and the current limiting mode of the mode 3 can fundamentally reduce the current when a large current is cut off, so that the arc energy is reduced, the contact burning loss is reduced, and the application is wider and wider. As shown in fig. 1, an air circuit breaker proposed in patent No. 02804534.3 utilizes a second circuit to limit the current when the circuit breaker is switched on or off, but it uses a resistance alloy or a steel plate to weld with the contacts, and because the contact area is large, if a high resistance material such as iron-chromium-aluminum is used, the copper-based contacts are melted due to the high temperature rise caused by the high resistance, and therefore only a medium resistance material can be used, and there is a problem of limited current limiting effect; as shown in fig. 2, patent No. 201220410921.1 discloses a contact device and a circuit breaker, which indirectly form a new conductive current limiting loop through an arc, the loop is greatly affected by the arc, there may be a failure condition, and the current limiting effect is not direct, and in addition, the above two prior arts are only applicable to a clapper type rotary contact, and cannot be applied to a rotary plug-in type contact capable of rotating forward and backward.

Disclosure of Invention

Against this background, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide a static contact and a switching device, which can effectively overcome at least one of the above-mentioned problems.

The invention is realized by the following technical scheme:

a fixed contact comprises a first fixed contact and a second fixed contact, wherein the second fixed contact is arranged on one side of the first fixed contact along the width direction of a switch device and is electrically connected with a power supply terminal of the switch device through a first resistor body.

Preferably, the fixed contact further includes a third fixed contact, and the third fixed contact and the second fixed contact are disposed on the other side of the first fixed contact, and are electrically connected to the power supply terminal of the switch device through the first resistor or the second resistor.

Preferably, the ends of the second fixed contact and the third fixed contact close to the movable contact are respectively arranged in an insulating manner with the end of the first fixed contact close to the movable contact.

Preferably, the second fixed contact or the third fixed contact is contacted with the movable contact before the first fixed contact, and then disconnected after the first fixed contact.

Preferably, the ends of the second fixed contact and the third fixed contact far away from the moving contact are arranged integrally or separately.

Preferably, the first resistor or the second resistor is one or more of iron-chromium-aluminum, iron-nickel-aluminum, nickel-chromium, constantan or manganin materials.

The invention also discloses a switch device which comprises an insulating shell, a power supply wiring terminal, a moving contact and the static contact.

Preferably, the moving contact is of a single-breakpoint type or a double-breakpoint type.

Preferably, the moving contact is of a double-breakpoint type, and the switching device further includes a switching static contact.

Preferably, the width of the end part of the conversion fixed contact close to the moving contact is smaller than the sum of the widths of the end parts of the first fixed contact and the second fixed contact or the third fixed contact close to the moving contact.

Preferably, at least one arc extinguishing chamber is further arranged between the conversion static contact and the moving contact.

Preferably, the moving contact, the first fixed contact, the second fixed contact and/or the third fixed contact are/is further provided with an insulating sheet.

Preferably, the switching device is a circuit breaker, an automatic transfer switch or a phase change transfer switch.

Preferably, the static contacts are in one group, two groups or three groups.

The invention has the following beneficial effects:

1. the high-resistance circuit is arranged in parallel with the low-resistance circuit, the low-resistance circuit carries normal working current, and the high-resistance circuit reduces the current when the current is cut off to generate an arc, so that the energy of the arc is reduced, the contact is protected to the greatest extent, and the current limiting mode is more direct;

2. the high-resistance high-melting-point alloy material such as iron, chromium, aluminum and the like is used as the resistance element, so that the resistance of the high-resistance circuit can be improved to the greatest extent, and the maximum current limiting effect is achieved;

3. according to the invention, the second static contact and the third static contact are arranged on the two sides of the low-resistance static contact along the rotating direction of the movable contact, so that the current can be limited when the rotary plug-in contact is switched on or switched off in a forward and reverse rotation manner;

4. when the moving contact is in a double-breakpoint type, the width of the head part of the switching static contact is smaller than the sum of the widths of the head parts of the first static contact and the second static contact, and the two breakpoints are sequentially connected and disconnected, so that on one hand, the labor-saving effect is achieved, on the other hand, electric arcs are ensured to be generated on the side of the switching static contact, and the phenomenon of interphase short circuit between static contacts of different power supply phases, which is easily generated due to small electric gaps between adjacent static contacts, is effectively avoided when the static contacts are provided with multiple groups.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a prior art embodiment.

Fig. 2 is a schematic structural diagram of another prior art embodiment.

Fig. 3 is a schematic diagram of the internal structure layout of the switching device of the present invention.

Fig. 4 is a schematic view of a driving structure of the switching device of the present invention.

Fig. 5 is a schematic structural view of a connection mode between an energy storage unit and a moving contact of the switching device according to the present invention.

Fig. 6 is a schematic view of the internal structure layout of the switch device according to another aspect of the present invention.

Fig. 7 is a schematic structural view of a moving contact, a fixed contact and a switching fixed contact of the switching device of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is in no way limited to any specific configuration set forth below, but rather covers any modification, replacement or improvement of elements, parts or the like without departing from the spirit of the present invention. In the drawings and the following description, well-known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention.

For ease of description, the length, width and height directions referred to hereinafter correspond to the Z, X and Y directions, respectively, shown in FIG. 3, it being understood that the above-identified orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are intended to facilitate the description of the invention and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation and are not to be construed as limiting the invention.

In the description of the present invention, it should be noted that the terms "first", "second", and "third", etc., are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless otherwise stated.

It should be noted that the following references to orientations and positional relationships are based on the orientations and positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but do not refer to or imply that the referenced devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

As shown in fig. 3 to 5, the present invention discloses a static contact 150 and a switch device 10 using the static contact 150, where the switch device 10 includes an insulating housing 100, a power terminal, a moving contact 140, a static contact 150, a driving device 160 and an electronic controller 170, the power terminal, the moving contact 140, the static contact 150, the driving device 160 and the electronic controller 170 are all disposed in the insulating housing 100, the power terminal includes a power inlet terminal 120 and a power outlet terminal 130, the power inlet terminal 120 and the power outlet terminal 130 are respectively disposed at two ends of the insulating housing 100, the static contact 150 includes a first static contact 151, a second static contact 152 and a third static contact 153, the second static contact 152 is disposed at one side of the first static contact 151 along a width direction of the switch device 10, i.e. an X-axis direction shown in fig. 3, and is electrically connected to the power inlet terminal 120 of the switch device 10 through a first static contact 110, the third fixed contact 153 and the second fixed contact 152 are oppositely disposed on the other side of the first fixed contact 151, and are electrically connected to the power inlet terminal 120 of the switch device 10 through the first resistor 110, that is: the ends of the second fixed contact 152 and the third fixed contact 153, which are far away from the moving contact 140, are electrically connected to one end of the first resistor 110, the other end of the first resistor 110 is electrically connected to the power inlet 120, the second fixed contact 152 and the third fixed contact 153 are electrically connected to the power inlet 120 through the first resistor 110, and the first fixed contact 151 is not connected to the resistor 110. Of course, in other specific embodiments, the second fixed contact 152 and the third fixed contact 153 may also be connected to two different resistors respectively, for example, the second contact 152 is electrically connected to the power inlet 120 through the first resistor 110, and the third fixed contact 153 is electrically connected to the power inlet 120 through the second resistor, and also can be electrically connected to the power inlet 120. The first resistor 110 and the second resistor may be made of the same material or different materials, and are not limited herein. The ends of the second fixed contact 152 and the third fixed contact 153 close to the movable contact 140 are respectively arranged in an insulating manner with the end of the first fixed contact 151 close to the movable contact 140, so that the normal implementation of the current limiting function can be ensured, and the current is prevented from forming a short circuit between the first fixed contact 151 and the second fixed contact 152 or the third fixed contact 153, which results in that the current limiting function cannot be implemented. It should be noted that, the number of the power line inlet terminals 120 is the same as that of the fixed contacts 150, and when the switch device 10 is provided with a plurality of power line inlet terminals, the fixed contacts 150 are also correspondingly provided with a plurality of groups.

In this embodiment, the ends of the second fixed contact 152 and the third fixed contact 153 away from the movable contact 140 are integrally disposed and electrically connected to the power line inlet 120. Of course, in other feasible embodiments, the ends of the second fixed contact 152 and the third fixed contact 153 away from the movable contact 140 may also be separately arranged and electrically connected to the power line inlet 120, as long as the ends of the second fixed contact 152 and the third fixed contact 153 away from the movable contact 140 are electrically connected to the power line inlet 120, which is not limited herein.

Referring to fig. 5, the movable contact 140 is rotatably connected to the insulating housing 100 and is connected to the energy storage mechanism 161 through a core shaft 141, preferably, the movable contact 140 may be a single-break contact or a double-break contact, and when the movable contact 140 is in a single-break structure, one end of the movable contact 140 away from the fixed contact 150 is electrically connected to the power outlet 130 through a flexible conductor; when the moving contact 140 is a double-breakpoint structure, at this time, the switching device 10 further includes a switching static contact 154, the moving contact 140 is rotationally connected to or disconnected from one end of the switching static contact 154, and the other end of the switching static contact 154 is electrically connected to the power outlet 130 through a flexible conductor, as shown in fig. 7, a width of an end portion of the switching static contact 154 close to the moving contact 140 is smaller than a sum of widths of end portions of the first static contact 151 and the second static contact 152 or the third static contact 153 close to the moving contact 140, that is, referring to fig. 7, d4 < d1+ d2 and/or d4 < d1+ d3, where d1 is a width of an end portion of the first static contact 151 close to the moving contact 140, d2 is a width of an end portion of the second static contact 152 close to the moving contact 140, and d3 is a width of an end portion of the third static contact 153 close to the moving contact 140, d4 is the width of the end of the stationary switching contact 154 near the movable contact 140. The advantages of the arrangement are that: the moving contact 140, the static contact 150 and the switching static contact 154 are not switched on or off at the same time, but are sequentially switched on or off at one time, so that on one hand, labor saving effect is achieved, and on the other hand, electric arc is ensured to occur at the side of the switching static contact 154, thereby effectively avoiding the phenomenon of interphase short circuit between static contacts of different power supply phases, which is easy to occur due to small electric gaps between adjacent static contacts when the static contacts 150 are provided with multiple groups.

In this embodiment, compared with a single-breakpoint structure, the moving contact 140 adopting a double-breakpoint form has the beneficial effects that forward rotation or reverse rotation within 360 degrees of the moving contact 140 can be realized, and the structure is more favorable for breaking arc extinction, thereby ensuring reliable use of the switch.

Further, in a preferred embodiment, please refer to fig. 6, at least one arc extinguish chamber 190 is further disposed between the switching static contact 154 and the moving contact 140, an insulating sheet 155 is further disposed on the moving contact 140, the first static contact 151, the second static contact 152 and/or the third static contact 153, and the arc extinguish chamber 190 and the insulating sheet 155 play roles of lengthening, cooling an arc and assisting arc extinction when a power supply is switched. Referring to fig. 4 and 5, the driving device 160 includes an energy storage mechanism 161, a transmission mechanism 162 and a power device 163, the power device 163 provides power and transmits the driving force to the energy storage mechanism 161 through the transmission mechanism 162, and the transmission mechanism 162 is respectively connected to the energy storage mechanism 161 and the power device 163 in a rotating manner. In this embodiment, the power device 163 is a motor, the transmission mechanism 162 is a gear transmission mechanism, and is connected to the driving shaft of the motor, the transmission mechanism 162 and the energy storage mechanism 161 are in gear transmission, under the driving of the motor, the driving wheel of the transmission mechanism 162 rotates and drives the driven wheel of the energy storage mechanism 161 to rotate, so as to drive the energy storage mechanism 161 to rotate. The energy storage mechanism 161 is connected to the movable contact 140, and when the energy storage mechanism 161 rotates, the movable contact 140 can be driven to rotate, so as to switch, connect or disconnect the power supply of the switch device 10.

Of course, in other embodiments, the driving device 160 may be implemented in other manners, such as an electromagnetic type, a permanent magnet type, a magnetic holding type or a pneumatic type, as long as the movable contact 140 can be provided with a rotational driving force.

Further, in other specific embodiments, the energy storage mechanism 161 may not be provided, but the transmission mechanism 162 is directly contacted with the movable contact 140, and the transmission mechanism 162 directly drives the movable contact 140 to rotate under the driving of the power device 163, so as to close or open the movable contact 140 and the fixed contact 150, thereby implementing the connection or disconnection of the circuit.

When the moving contact 140 is disconnected from the second fixed contact 152 or the third contact 153 and is connected to the first fixed contact 151, the switching device 10 is a low-resistance circuit at this time, and is in a normal operating state of the switching device 10, at this time, the current of the main loop flows from the power supply inlet terminal 120 through the first fixed contact 151 and flows through the moving contact 150, and a low-resistance circuit is formed between the first fixed contact 151 and the moving contact 150; when the moving contact 140 contacts the second fixed contact 152 or the third contact 153 and is disconnected from the first fixed contact 151, because the second fixed contact 152 or the third contact 153 is electrically connected to the power terminal of the switching device 10 through the first resistor 110, the switching device 10 is a high-resistance circuit at this time, the current of the main circuit flows through the moving contact 140 from the power inlet terminal 120 through the resistor 110 and the second fixed contact 152 or the third contact 153 electrically connected to the first resistor 110, a high-resistance circuit is formed between the second fixed contact 152 or the third contact 153 and the moving contact 140, and the high-resistance circuit reduces the circuit current, thereby reducing the arc energy, protecting the contacts to the greatest extent, and achieving the current limiting effect. Preferably, the first resistor body 110 or the second resistor body is one or more of high-resistance high-melting-point alloy materials such as iron-chromium-aluminum, iron-nickel-aluminum, nickel-chromium, constantan or manganin, and the resistance of the high-resistance circuit can be improved to the greatest extent, so that the maximum current limiting effect is achieved.

Specifically, referring to fig. 3, in the present embodiment, when the movable contact 140 rotates counterclockwise from the illustrated position, the movable contact 140 is firstly connected to the second stationary contact 152, and then connected to the first stationary contact 151, and the movable contact 140 is firstly disconnected from the first stationary contact 151, and then disconnected from the third stationary contact 153; when the movable contact 140 rotates clockwise from the illustrated position, the movable contact 140 is first connected to the third stationary contact 153 and then connected to the first stationary contact 151, and the movable contact 140 is first disconnected from the first stationary contact 151 and then disconnected from the second stationary contact 152; the second fixed contact 152, the second fixed contact 152 and the third fixed contact 153 are respectively disposed at two sides of the movable contact 140, and thus the following advantages are provided: the moving contact 140 can be rotated forward or backward by 360 degrees to realize that the second fixed contact 152 or the third fixed contact 153 contacts the moving contact 140 before the first fixed contact 151 is contacted, and then the second fixed contact 151 is disconnected, so that the current limiting effect can be realized.

Of course, in other possible embodiments, the second stationary contact 152 may be disposed on only one side of the first stationary contact 151, and the movable contact 140 rotates forward or backward within a set non-360 degrees to be connected or disconnected with the second stationary contact 152, so as to achieve the current limiting effect, which is not limited herein.

In a preferred embodiment, a current transformer 180 is further disposed in the switch device 10, the current transformer 180 is sleeved between the moving contact 140 and the outlet terminal 130, the current transformer 180 can transmit collected current information to the electronic controller 170, and the electronic controller 170 sends a power switching instruction, such as a phase change operation of a phase change switch or an on/off operation of a circuit breaker, according to the received current information.

In a preferred embodiment, the electronic controller 170 further includes a voltage acquisition module, which can provide a voltage signal of the power inlet terminal 120 to the electronic controller 170, and the electronic controller 170 sends a power switching command, such as a power switching action of an automatic transfer switch, according to the received voltage signal.

Further, a communication module and an intelligent distribution transformer control terminal are further arranged in the switch device 10, and the intelligent distribution transformer control terminal is a high-integration and high-intelligence control terminal which can realize distribution transformer state monitoring, load unbalance control strategies, reactive compensation control, reports, metering and remote system communication by utilizing the modern digital signal processing technology. The electronic controller 170 CAN control the communication module to send related information to the intelligent distribution transformer control terminal, so that the intelligent distribution transformer control terminal CAN know the state and the load condition of the power switching device in real time, calculate the three-phase unbalance degree, make a load control strategy and send a control command, the communication module transmits the control command to the electronic controller to perform phase change action on the power switching device so as to realize the three-phase balance of the load, the communication module CAN adopt a wireless communication mode or a wired communication mode, the wireless communication mode comprises Bluetooth, infrared, Wifi, ZigBee, GPRS, 4G, 5G, NB-IoT or LoRa, and the wired communication mode comprises RS485, LAN, CAN, DeviceNet, Profibus or HPLC and the like.

As described above, the number of the power line inlet terminals 120 of the switch device 10 may be multiple, in this case, the fixed contact 150 may be provided in multiple corresponding to the power line inlet terminals 120, and the switch device 10 may be a circuit breaker, an automatic transfer switch, or a phase change transfer switch.

In this embodiment, the switch device 10 is a phase change switch, the power line inlet end 120 includes a first power line inlet end 120A, a second power line inlet end 120B, and a third power line inlet end 120C, the first power line inlet end 120A, the second power line inlet end 120B, and the third power line inlet end 120C are respectively electrically connected to the phase a, the phase B, and the phase C of the three-phase power supply, and the first power line inlet end 120A, the second power line inlet end 120B, and the third power line inlet end 120C are sequentially arranged along the width direction of the insulating housing 100, i.e., the X-axis direction shown in fig. 3, the three groups of stationary contacts 150 are three groups and respectively correspond to the phase a, the phase B, and the phase C of the three-phase power supply, and the moving contact 140 rotates to switch with the three groups of stationary contacts 150, so that the moving contact can be selectively connected to different power phases to solve the problem of unbalanced three phases of the power supply system.

In other feasible embodiments, the power line inlet end 120 includes any two or three of a first power line inlet end 120A, a second power line inlet end 120B, and a third power line inlet end 120C, the two or three groups of power line inlet ends are respectively electrically connected to two or three power sources, the two or three groups of static contacts 150 are two or three groups, and the two or three groups of static contacts respectively correspond to the two power sources, and the moving contact 140 rotates and switches between the two or three groups of static contacts 150, so that different power sources can be selectively accessed by the moving contact, and the moving contact can be applied to an automatic transfer switch, and the functions of automatic power source transfer and continuous power supply can be realized.

In other feasible embodiments, the power line inlet end 120 includes any one of a first power line inlet end 120A, a second power line inlet end 120B, and a third power line inlet end 120C, the group of power line inlet ends are respectively electrically connected to a power source, the static contacts 150 are a group, the moving contact 140 rotates to be connected with or disconnected from the static contacts 150, so that the connection or disconnection of the power source can be realized, and the power line inlet end can be applied to a circuit breaker to realize the on-off control and protection functions of the power source.

The following briefly describes the power switching process of the switching device 10 by taking the switching device 10 as a commutation switch as an example:

the electronic controller 170 sends a power switching instruction according to the received current information or voltage information, the power device 163 starts to move after receiving the instruction, and transmits the command to the energy storage mechanism 161 through the transmission mechanism 162, and the energy storage mechanism 161 drives the moving contact 140 to be quickly disconnected or connected with the conversion fixed contact 154 and the fixed contact 150 through the mandrel 141.

The high-resistance circuit is arranged in parallel with the low-resistance circuit, the low-resistance circuit carries normal working current, and the high-resistance circuit reduces the current when the current is cut off to generate an arc, so that the energy of the arc is reduced, the contact is protected to the greatest extent, and the current limiting mode is more direct; the high-resistance high-melting-point alloy materials such as iron, chromium, aluminum and the like are used as the resistance element, so that the resistance of the high-resistance circuit can be improved to the greatest extent, and the maximum current limiting effect is achieved; the second static contact and the third static contact are arranged on the two sides of the low-resistance static contact along the rotating direction of the moving contact, so that the current can be limited when the rotary plug-in contact is switched on or switched off in a forward and reverse rotation mode; when the moving contact is in a double-breakpoint type, the width of the head part of the switching static contact is smaller than the sum of the widths of the head parts of the first static contact and the second static contact, and the two breakpoints are sequentially connected and disconnected, so that on one hand, the labor-saving effect is achieved, on the other hand, electric arcs are ensured to occur at the side of the switching static contact, and the inter-phase short circuit phenomenon which is easily caused between static contacts of different power supply phases due to small electric gaps between adjacent static contacts when the static contacts are arranged in multiple groups is effectively avoided, so that the inter-phase short circuit phenomenon between the first static contact and the second static contact or the inter-phase short circuit phenomenon is avoided.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.