CN115602484A - Electrical isolating switch and arc extinguishing method thereof - Google Patents

Abstract

The application discloses an electrical isolating switch and an arc extinguishing method thereof, wherein the electrical isolating switch comprises a shell assembly and an electrical contact assembly suitable for controlling the state switching of the electrical isolating switch. The electrical disconnector deflects an arc generated when it is switched between states using a magnetic field generating element, and then physically intervenes through a narrow space provided on a deflection path of the arc, in such a manner that the arc is rapidly drawn and elongated to achieve rapid arc extinguishing.

Description

Electrical isolating switch and arc extinguishing method thereof

Technical Field

The application relates to the field of switches, in particular to an electrical isolating switch and an arc extinguishing method thereof.

Background

In recent years, with the development of dc transmission systems toward high voltages, the market has increasingly demanded dc switches for controlling the on/off of dc power. One technical difficulty faced by dc switches in their application is: the arc generated by the direct current is effectively extinguished, i.e., the arc is extinguished.

For example, in a photovoltaic system, a dc switch for controlling between a photovoltaic panel and an inverter is provided with a stationary contact part and a movable contact part movable relative to the stationary contact part, and when a voltage and/or a current in a dc circuit is greater than a preset range, an arc is formed between the movable contact part and the stationary contact part at the moment when the dc switch is separated during the breaking of the conducted dc circuit. Since the arc can conduct electricity, even if the movable contact part is separated from the stationary contact part, the dc circuit is still in a conducting state, and the dc circuit cannot be disconnected until the arc is extinguished, that is, the arc prolongs the time for the dc switch to open the circuit.

The greater the voltage or current in the dc circuit, the more arcing occurs during opening of the dc circuit by the dc switch. When the generated arc is excessive, the direct current switch may be burnt, other devices electrically connected to the direct current switch in the circuit may be damaged, and explosion may be caused in a place (for example, a gas plant) sensitive to the electric spark generated by the arc. Therefore, the arc extinguishing performance of the direct current switch is an important index for evaluating the quality of the direct current switch, and influences the service life, the use safety and the reliability of the direct current switch.

There are many schemes for arc extinction of dc switches, for example, increasing the diameter of the moving contact to increase the distance to lengthen the arc, increasing the breaking speed, and adding magnets to extinguish the arc. However, these arc extinguishing solutions have some drawbacks, for example, increasing the diameter of the moving contact part leads to an increase in the overall size of the dc switch, which is contrary to the current trend of miniaturization of the switches, and there is a significant speed limit for increasing the breaking speed, and the increase in the breaking speed leads to a decrease in the control stability and the lifetime of the dc switch, while the arc extinguishing effect of the additional magnet is not significant and often fails to meet the application requirements.

Therefore, a new arc extinguishing solution for dc switches is desired.

Disclosure of Invention

An advantage of the present application is to provide an electrical isolator and an arc extinguishing method thereof, wherein the electrical isolator fine-tunes the structure of the electrical isolator based on a conventional magnetic arc extinguishing scheme to form a narrow space acting on an arc on a deflection path of the arc, and the narrow space can force an arc entering the narrow space to be thinned and lengthened to accelerate the breaking and extinguishing of the arc, in such a way, the arc extinguishing capability of the electrical isolator is enhanced.

Another advantage of the present application is to provide an electrical isolation switch and an arc extinguishing method thereof, wherein the electrical isolation switch can enhance the arc extinguishing capability of the electrical isolation switch without greatly increasing the overall size thereof or increasing the overall size thereof by configuring the narrow space. That is, the electrical isolation switch that this application provided can have relatively stronger arc extinguishing performance when satisfying the miniaturized trend of switch.

Another advantage of the present application is to provide an electrical isolation switch and an arc extinguishing method thereof, wherein the electrical isolation switch can be obtained by structural modification of a conventional dc switch, for example, modification can be realized by replacing a housing of the conventional dc switch.

According to an aspect of the present application, there is provided an electrical disconnector, comprising: a housing assembly; an electrical contact assembly mounted to the housing assembly, wherein the electrical contact assembly includes at least one static contact and at least one dynamic contact, the dynamic contact being movable relative to the static contact to be adapted to control the electrical isolation switch to switch between an on-state and an off-state, the dynamic contact being in contact with the static contact when the electrical isolation switch is switched to the on-state, and the dynamic contact being spaced from the static contact when the electrical isolation switch is switched to the off-state; and at least one magnetic field generating element for deflecting an arc generated by the electrical disconnector during switching of states; wherein the housing assembly forms at least one narrow space that is located on a deflection path of the arc.

In the electrical isolating switch according to the present application, the at least one magnetic field generating element includes a first magnetic element corresponding to a moving path of the movable contact.

In an electrical disconnector according to the application, the at least one magnetic field generating element comprises a first magnetic element which is remote from the moving path of the movable contact part in a radial direction of the electrical contact assembly.

In an electrical disconnect switch according to the present application, the first magnetic element has opposing first and second magnetic poles, wherein the first magnetic pole faces a path of movement of the dynamic contact and the second magnetic pole is spaced from the first magnetic pole along an axial direction of the electrical contact assembly.

In the electrical isolating switch according to the present application, the at least one narrow space includes a first narrow space located outside a moving path of the movable contact.

In the electrical isolating switch according to the present application, the at least one narrow space further includes a second narrow space located inside a moving path of the movable contact portion.

In the electrical isolating switch according to the application, the housing assembly includes a bearing housing having a first mounting cavity for mounting the electrical contact assembly therein, wherein the bearing housing further has a first arc extinguishing groove concavely formed therein, the first arc extinguishing groove forming the first narrow space.

In the electrical isolating switch according to the present application, the carrier case further has a second arc extinguishing groove concavely formed therein, the second arc extinguishing groove forming the second narrow space.

In an electrical disconnector according to the application, the first magnetic element has opposite first and second magnetic poles, wherein the first magnetic pole faces the path of movement of the dynamic contact and the second magnetic pole is remote from the first magnetic pole in a radial direction of the electrical contact assembly.

In the electrical isolating switch according to the present application, the at least one narrow space includes a first narrow space located at an upper side of a moving path of the movable contact.

In the electrical isolating switch according to the present application, the at least one narrow space further includes a second narrow space located at a lower side of a moving path of the movable contact.

In an electrical isolating switch according to the present application, the first magnetic element has an arc-shaped structure extending along a movement path of the dynamic contact.

In the electrical isolating switch according to the present application, the first narrow space and/or the second narrow space may extend in a manner corresponding to the extension of the first magnetic element.

In the electrical isolating switch according to the application, the housing assembly includes a bearing housing and an encapsulation housing covering the bearing housing, the bearing housing has a first installation cavity for installing the electrical contact assembly therein and a second installation cavity for installing the first magnetic element therein, the second installation cavity is located at the outer side of the first installation cavity, wherein the first narrow space forms the encapsulation housing with bear between the housings and be located at the upper side of the first magnetic element.

In the electrical disconnector according to the present application, the second narrow space is formed between the package housing and the carrier housing and is located at a lower side of the first magnetic element.

According to another aspect of the present application, there is also provided an arc extinguishing method of an electrical isolation switch, including: the arc generated when the electrical isolating switch is switched is guided into at least one narrow space by the magnetic field generating element.

Further objects and advantages of the present application will become apparent from an understanding of the ensuing description and drawings.

These and other objects, features and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.

Fig. 1 illustrates a block diagram schematic of an electrical isolation switch of an embodiment of the present application.

Fig. 2 illustrates a partial perspective view of a specific example of the electrical disconnect switch according to an embodiment of the present application.

Fig. 3 illustrates a partial perspective view of another specific example of the electrical isolation switch according to an embodiment of the present application.

Fig. 4 illustrates an internal structure perspective view of the electrical isolation switch according to an embodiment of the present application.

Fig. 5 illustrates a partially disassembled schematic view of a switching unit of the electrical disconnector according to an embodiment of the present application.

Fig. 6A illustrates a partial perspective view of one implementation of the electrical disconnect switch according to an embodiment of the present application.

Fig. 6B illustrates a partial perspective view of another implementation of the electrical disconnect switch according to an embodiment of the present application.

Detailed Description

Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein.

Summary of the application

As described above, there are many schemes for arc extinction of the dc switch, such as increasing the diameter of the moving contact portion to increase the distance to lengthen the arc, increasing the breaking speed, and adding a magnet to extinguish the arc. However, these arc extinguishing solutions have some drawbacks, for example, increasing the diameter of the moving contact part leads to an increase in the overall size of the dc switch, which is contrary to the current trend of miniaturization of the switches, and there is a significant speed limit for increasing the breaking speed, and the increase in the breaking speed leads to a decrease in the control stability and the lifetime of the dc switch, while the arc extinguishing effect of the additional magnet is not significant and often fails to meet the application requirements.

Therefore, a new arc extinguishing solution for dc switches is desired.

Specifically, through the research on the scheme of the inventor of the application for extinguishing the arc of the magnet, the following results are found: in the solution of deflecting the arc by the magnets so as to elongate it and thus break it, in order to draw it long and thin enough to break it, it is necessary to provide enough space for the arc to stretch, which undoubtedly increases the overall size of the dc switch. That is, in the case of the solution of arc extinguishing by the magnet, the space of the housing is a technical contradiction, and if the space inside the housing is not increased to provide a sufficient arc breaking space, the performance of arc extinguishing by the magnet is not good, and if the space inside the housing is increased, the increase of the overall size of the dc switch is caused, which is not in line with the trend of miniaturization of the dc switch.

Based on this, the inventors of the present application tried to configure an intervention mechanism for the deflected arc on the basis of the arc extinction by the magnet, so as to enhance the arc extinction capability of the dc switch through an appropriate intervention mechanism. It should be noted that in the conventional dc switch for extinguishing arc by means of magnets, the extinction of arc is a natural law that depends on the arc becoming thinner during elongation without additional intervention mechanisms. Accordingly, in the solution of the present application, a narrow space capable of acting on the arc is provided on the deflection path of the arc, wherein the narrow space can force the arc entering therein to taper and lengthen based on the "narrow slit principle" to accelerate the breaking and extinguishing of the arc, in such a way that the arc extinguishing capability of the electrical disconnector is enhanced. Here, the narrow space is a newly-established intervention mechanism.

More specifically, in the conventional magnetic arc extinguishing scheme, the arc is deflected to a specific direction under the action of a magnetic field, that is, the magnetic field generated by the magnet can control the deflection mode of the arc. In this way, a magnetic field generating element (e.g., a magnet or a coil, etc.) can be configured in the dc switch to guide the arc in a specific manner through a specific magnetic field generated by the magnetic field generating element so as to deflect the arc in a predetermined manner, and at the same time, a narrow space capable of intervening in the arc is configured on a deflection path of the arc so as to rapidly thin and elongate the arc through physical intervention of the narrow space to achieve rapid arc extinction. It is worth mentioning that, since the magnetic field can deflect the arc in a specific direction, the deflection path of the arc and the position of the narrow space on the deflection path of the arc can be selectively and flexibly planned.

By configuring the narrow space, the electric isolating switch can enhance the arc extinguishing capability of the electric isolating switch on the premise of not greatly increasing the overall size of the electric isolating switch or the overall size of the electric isolating switch. That is, the electrical isolation switch that this application provided can have relatively stronger arc extinguishing performance when satisfying the miniaturized trend of switch. Furthermore, the electrical isolation switch can be obtained by structural modification of a conventional dc switch, for example, modification can be realized by replacing a housing of the conventional dc switch.

Based on this, the present application provides an electrical disconnector, comprising: the magnetic field generating device comprises a shell assembly, an electrical contact assembly arranged on the shell assembly, and at least one magnetic field generating element. The electrical contact assembly includes at least one static contact and at least one dynamic contact movable relative to the static contact for controlling the electrical isolator to switch between an on-state and an off-state, the dynamic contact being in contact with the static contact when the electrical isolator is switched to the on-state and being spaced from the static contact when the electrical isolator is switched to the off-state. The housing assembly forms at least one narrow space that is located on a deflection path of the arc.

Correspondingly, the application also provides an arc extinguishing method of the electrical isolation switch, which comprises the following steps: the arc generated when the electrical isolating switch is switched is guided into at least one narrow space by the magnetic field generating element.

Having described the general principles of the present application, various non-limiting embodiments of the present application will now be described with reference to the accompanying drawings.

Schematic electrical isolating switch

As shown in fig. 1-6B, the electrical isolation switch according to an embodiment of the present application is illustrated for controlling a direct current power cut-off, for example, for controlling an electrical cut-off between a photovoltaic panel and an inverter in a photovoltaic system. The electrical isolation switch according to the embodiment of the present application includes at least one switch switching unit 50 and a control unit 60 for controlling state switching of the switch switching unit 50.

Specifically, in the embodiment of the present application, the electrical isolation switch includes a housing assembly 10, an electrical contact assembly 20 mounted to the housing assembly 10, and at least one magnetic field generating element 30, the housing assembly 10, the electrical contact assembly 20, and the at least one magnetic field generating element 30 form at least one switch switching unit 50, wherein the housing assembly 10 forms at least one narrow space 40 for acting on an arc. In a specific example of the present application, the housing assembly 10 forms at least one carrying housing 11 and at least one packaging housing 12 covering at least one carrying housing 11, and the carrying housing 11 and/or the packaging housing 12 of the housing assembly 10 forms at least one narrow space 40, which will be described later.

In the embodiment of the present application, a carrying case 11 and an enclosing case 12 covering the carrying case 11 in the case assembly 10 form a case structure of the switch switching unit 50.

It is worth mentioning that when the electrical isolation switch includes a plurality (greater than or equal to 2) of switch switching units 50, the housing structures of the respective switch switching units 50 may be independent from each other to achieve electrical insulation between the respective switch switching units 50 by the housing assembly 10. Of course, in some embodiments of the present application, the housing structure of at least a part of the switch switching unit 50 of the electrical isolation switch may also be shared, which only needs to be the case without affecting safety, and is not limited to this application.

Further, in the embodiment of the present application, when the electrical isolation switch includes at least two switch switching units 50, the combination manner between the at least two switch switching units 50 is not limited by the present application. For example, in one specific example of the present application, the at least two switching units 50 are combined in an up-down stacked manner, as shown in fig. 2. In another specific example of the present application, the at least two switch switching units 50 are combined together in a side-to-side lateral connection, as shown in fig. 3.

More specifically, in the example illustrated in fig. 2, one of the switch switching units 50 and the other switch switching unit 50 adjacent thereto are stacked one on top of the other in the axial direction of the electrical disconnector, wherein, as shown in fig. 5, the encapsulating housing 12 of each switch switching unit 50 is located above the carrier housing 11, and the carrier housing 11 of the switch switching unit 50 located at the upper level forms the encapsulating housing 12 of the switch switching unit 50 located at the lower level adjacent thereto. In this way, the housing assembly 10 of two switching units 50 stacked on top of each other is partially shared, which saves axial space and reduces the axial size of the electrical disconnector.

In the present embodiment, the housing assembly 10 forms a first mounting cavity 101 for mounting the electrical contact assembly 20 therein. Accordingly, the forming manner and the forming position of the first mounting cavity 101 are not limited by the present application. For example, in one embodiment of the present application, the carrier housing 11 has a first mounting cavity 101 for mounting the electrical contact assembly 20 therein. In another embodiment of the present application, the package housing 12 has a first mounting cavity 101 for mounting the electrical contact assembly 20 therein. In another embodiment of the present application, the carrying case 11 of the case assembly 10 has a cavity, the package case 12 has another cavity corresponding to the cavity, and the cavity of the carrying case 11 and the cavity of the package case 12 corresponding to the cavity cooperate to form the first mounting cavity 101.

The electrical contact assembly 20 comprises at least one static contact portion 22 and at least one dynamic contact portion 21, the dynamic contact portion 21 being movable relative to the static contact portion 22 under the action of the control unit 60 so as to be adapted to control the electrical disconnector to switch between an on-state and an off-state. The dynamic contact 21 is in contact with the static contact 22 when the disconnector is switched to the on-state and the dynamic contact 21 is separated from the static contact 22 when the disconnector is switched to the off-state.

In a specific example of the present application, the control unit 60 includes at least one operating element 61, and the operating element 61 is drivingly connected to the dynamic contact portion 21. When the electrical isolation switch is switched to the on-state, the operating element 61 is driven to drive the dynamic contact portion 21 to move relative to the static contact portion 22 until the dynamic contact portion 21 contacts with the static contact portion 22. In particular, in the solution of the present application, when at least one switch switching unit 50 in the electrical isolation switch is turned on, the electrical isolation switch is considered to be in the on-state. When the electrical isolation switch is switched to the off state, the dynamic contact portion 21 is brought by the operating member 61 to be separated from the static contact portion 22.

In one embodiment of the present application, the plurality of switch switching units 50 of the electrical isolation switch are interlockingly connected to each other so that the states of the plurality of switch switching units 50 can be changed synchronously, that is, the plurality of switch switching units 50 can be switched to an on-state at the same time or switched to an off-state at the same time, as shown in fig. 4.

In one embodiment of the present application, each of the two adjacent switch switching units 50 in the electrical disconnector includes a dynamic conductive member 70 having a dynamic contact portion 21, and the dynamic contact portion 21 moves relative to the static contact portion 22 when the dynamic conductive member 70 is driven to move. As shown in fig. 4, the dynamic conductive component 70 of one switch switching unit 50 of two adjacent switch switching units 50 in the electrical isolation switch is drivingly connected with the dynamic conductive component 70 of the other switch switching unit 50. When the operating element 61, which is drivingly connected to one of the two switch switching units 50, drives the dynamic conductive element 70 of the switch switching unit 50 to move, the dynamic conductive element 70 of the switch switching unit 50 drives the dynamic conductive element 70 of the other switch switching unit 50 to move, and thus the control unit 60 cooperatively controls the two switch switching units 50.

It should be noted that, when the electrical isolation switch includes a plurality of switch switching units 50, each switch switching unit 50 may be independently controlled by the control unit 60 to perform state switching, which is not limited in the present application.

In another embodiment of the present application, the electrical isolation switch comprises two switching cells 50 with dynamic conductive components 70 independent of each other, i.e. the dynamic conductive components 70 of the two switching cells 50 are independent of each other, wherein the movement of the dynamic conductive component 70 of one switching cell 50 does not affect the movement of the dynamic conductive component 70 of the other switching cell 50. The control unit 60 comprises one control member for controlling the dynamic conductive member 70 of one of the two switch switching units 50 and another control member for controlling the dynamic conductive member 70 of the other of the two switch switching units 50, in such a way that the control unit 60 controls the two switch switching units 50 independently.

In the present application, in each switch switching unit 50, the number of the static contact portions 22 (or the dynamic contact portions 21) is greater than or equal to 1. For example, in one embodiment of the present application, one switch switching unit 50 includes two stationary contacts 22 and two dynamic contacts 21, i.e., the number of the stationary contacts 22 is 2, and the number of the dynamic contacts 21 is 2, and in this embodiment, the two dynamic contacts 21 are integrally connected, i.e., the two dynamic contacts 21 have an integral structure. In particular, the switch-switching unit 50 comprises a movable contact element having two opposite conductive end portions forming the two dynamic contacts 21, in such a way that the two dynamic contacts 21 are integrally connected. In other embodiments of the present application, the two dynamic contact portions 21 may also be a split structure, and the present application is not limited thereto.

It should be noted that, in the embodiment of the present application, the manner in which the operating element 61 drives the dynamic contact portion 21 is not limited in the present application. In one embodiment of the present application, the operating element 61 is configured to rotate the dynamic contact portion 21 by a rotational motion. In another embodiment of the present application, the operating member 61 is configured to rotate the dynamic contact portion 21 by a linear motion. In another embodiment of the present application, the operating member 61 is configured to move the dynamic contact portion 21 linearly by a linear movement, which is not limited in the present application.

As described above, when the voltage and/or current in the dc circuit is greater than the predetermined range, an arc may be formed between the moving contact part and the stationary contact part of the dc switch at the moment when the dc switch is turned off to cut off the dc circuit that is turned on. The greater the voltage or current in the dc circuit, the more arcing occurs during opening of the dc circuit by the dc switch. That is, the greater the voltage or current in the circuit loop, the more arcing the electrical disconnector will generate when switching states. When the generated arc exceeds a certain limit, the electrical isolating switch can be burnt out or can not work normally.

There are many schemes for arc extinguishing of dc switches, for example, increasing the diameter of the moving contact to increase the distance to lengthen the arc, increasing the breaking speed, and adding magnets to extinguish the arc. However, these arc extinguishing solutions have some drawbacks, for example, increasing the diameter of the moving contact part leads to an increase in the overall size of the dc switch, which is contrary to the current trend of miniaturization of the switches, and there is a significant speed limit for increasing the breaking speed, and the increase in the breaking speed leads to a decrease in the control stability and the lifetime of the dc switch, while the arc extinguishing effect of the additional magnet is not significant and often fails to meet the application requirements.

Through the research of the inventor of the application on the magnetic arc extinguishing scheme, the following findings are found: in the solution of deflecting the arc by the magnets so as to elongate it and thus break it, in order to draw it long and thin enough to break it, it is necessary to provide enough space for the arc to stretch, which undoubtedly increases the overall size of the dc switch. That is, in the case of the solution of arc extinguishing by the magnet, the space of the housing is a technical contradiction, and if the space inside the housing is not increased to provide a sufficient arc breaking space, the performance of arc extinguishing by the magnet is not good, and if the space inside the housing is increased, the increase of the overall size of the dc switch is caused, which is not in line with the trend of miniaturization of the dc switch.

Based on this, the inventors of the present application tried to configure an intervention mechanism for the deflected arc on the basis of the arc extinction by the magnet, so as to enhance the arc extinction capability of the dc switch by an appropriate intervention mechanism. It should be noted that in the conventional dc switch for extinguishing arc by means of magnets, the extinction of arc is a natural law that depends on the arc becoming thinner during elongation without additional intervention mechanisms. Accordingly, in the solution of the present application, a narrow space 40 capable of acting on the arc is arranged on the deflection path of the arc, wherein the narrow space 40 can force the arc entering into it to be thinned and lengthened based on the "narrow slit principle" to accelerate the breaking and extinguishing of the arc, in such a way, the arc extinguishing capability of the electrical isolation switch is enhanced. Here, the narrow space is a newly-provided intervention mechanism.

More specifically, in the conventional magnetic arc extinguishing scheme, the arc is deflected to a specific direction under the action of a magnetic field, that is, the magnetic field generated by the magnet can control the deflection mode of the arc. In this way, a magnetic field generating element (for example, a magnet or a coil, etc.) can be configured in the dc switch to guide the arc in a specific manner through the specific magnetic field generated by the magnetic field generating element so as to deflect the arc in a predetermined manner, and at the same time, a narrow space 40 capable of interfering with the arc is configured on the deflection path of the arc so as to rapidly thin and elongate the arc through the physical interference of the narrow space 40 to achieve rapid arc extinction. It is worth mentioning that since the magnetic field is capable of deflecting the arc in a specific direction, the deflection path of the arc and the position of the narrow space 40 located on the deflection path of the arc can be selectively and flexibly planned.

That is, in the process of arc extinction by the magnet, the arc is deflected to a specific direction under the action of the magnetic field, so that a narrow space 40 for restraining the arc can be arranged on the deflection path of the arc, and the arc is thinned and lengthened to realize rapid arc extinction. And because the magnetic field can deflect the electric arc in a specific direction, the deflection path of the electric arc and the position of the narrow space 40 on the deflection path of the electric arc can be selectively and flexibly planned, so that the arc extinction can be realized under the condition of not greatly increasing the whole size of the direct current switch. The narrow space is not only beneficial to fast arc extinction, but also can save the occupied space, and is beneficial to the miniaturization of the electric isolating switch.

Accordingly, in the present embodiment, the electrical disconnector comprises at least one magnetic field generating element 30 for deflecting an arc generated by the electrical disconnector upon switching of states and at least one narrow space 40 located in a deflection path of the arc.

Specifically, the arc is generated between the static contact portion 22 and the dynamic contact portion 21, and the moving locus of the arc almost coincides with the moving path of the dynamic contact portion 21 without the action of the magnetic field. Therefore, in the embodiment of the present application, the movement locus of the dynamic contact portion 21 is used as a positional reference to describe the arrangement manner of other elements.

In some embodiments of the present application, at least a portion of the magnetic field generating element 30 corresponds to a motion trajectory of the dynamic contact portion 21 along an axial direction of the electrical contact assembly 20. In other embodiments of the present application, the magnetic field generating element 30 is away from the moving path of the dynamic contact portion 21 along the radial direction of the electrical contact assembly 20, for example, the moving path of the magnetic field generating element 30 is away from the dynamic contact portion 21 within a certain distance range along the radial direction of the electrical contact assembly 20, so as to ensure that the magnetic field generated by the magnetic field generating element 30 can act on the arc.

It should be understood that, in the embodiment of the present application, the position of the magnetic field generating element 30 is not limited to the present application, and it is only necessary that the magnetic field generated by the magnetic field generating element 30 can act on the arc to shift the arc along the predetermined direction. It is worth mentioning that in the embodiment of the present application, the magnetic field generating element 30 may be implemented as any element capable of generating a magnetic field, for example, a permanent magnet, a magnetic element such as a soft magnet, an electrified coil, and the like.

In one embodiment of the present application, the at least one magnetic field generating element 30 comprises a first magnetic element 31 corresponding to a movement path of the dynamic contact portion 21 along at least a portion of an axial direction of the electrical contact assembly 20, as shown in fig. 6A. In another embodiment of the present application, the at least one magnetic field generating element 30 comprises a first magnetic element 31 along a movement path of the electrical contact assembly 20 in a radial direction away from the dynamic contact portion 21, as shown in fig. 6B.

It will be appreciated that the orientation of the poles of the magnetic element will affect the deflection path of the arc and thus the position of the narrow space 40. In one embodiment of the present application, the first magnetic element 31 has opposing first and second magnetic poles, the first magnetic pole facing the path of movement of the dynamic contact 21 and the second magnetic pole facing away from the first magnetic pole in the axial direction of the electrical contact assembly 20. The bearing housing 11 has a second mounting cavity 102 for mounting the first magnetic element 31 therein, at least a portion of the second mounting cavity 102 corresponds to the first mounting cavity 101 in the axial direction of the housing assembly 10, and the wall of the second mounting cavity 102 is made of an insulating material.

The deflection path of the arc can be determined according to the orientation of the magnetic pole of the first magnetic element 31, and the arrangement position and the arrangement mode of the narrow space 40 can be further determined. In this way, the electrical disconnector guides the arc to deflect according to a preset path through the magnetic field generated by the first magnetic element 31, and further captures the arc through the narrow space 40 disposed on the deflection path of the arc, so as to thin and elongate the arc, thereby achieving arc extinction.

In this embodiment, the narrow space 40 of the electrical isolation switch includes a first narrow space 41 and a second narrow space 42, the first narrow space 41 is located outside the movement path of the dynamic contact portion 21, and the second narrow space 42 is located inside the movement path of the dynamic contact portion 21. Here, the inner side is a side directed close to the center of the housing assembly 10, and the outer side is a side close to the outer circumference of the housing assembly 10. The number of the first narrow spaces 41 is greater than or equal to 1, and the number of the second narrow spaces 42 is greater than or equal to 1. The first narrow space 41 may be formed on the upper and/or lower side of the dynamic contact portion 21, and the second narrow space 42 may also be formed on the upper and/or lower side of the dynamic contact portion 21, which is not limited in this application.

In another embodiment of the present application, the electrical isolation switch may be provided with only the first narrow space 41 located outside the movement path of the dynamic contact portion 21, or only the second narrow space 42 located inside the movement path of the dynamic contact portion 21. In other embodiments of the present application, a narrow space 40 may be further provided at the left and/or right side of the first magnetic element 31.

In this embodiment, the first narrow space 41 and the second narrow space 42 are formed by a groove of the carrying case 11 itself. Specifically, the carrier housing 11 has a first arc-extinguishing groove concavely formed therein, the first arc-extinguishing groove forming the first narrow space 41, and the carrier housing 11 also has a second arc-extinguishing groove concavely formed therein, the second arc-extinguishing groove forming the second narrow space 42. The openings of the first and second arc-extinguishing grooves face the dynamic contact portion 21, and the depth directions of the first and second arc-extinguishing grooves are in accordance with the axial direction of the housing assembly 10. In other embodiments of the present application, the first narrow space 41 and the second narrow space 42 may be formed in other manners.

It is worth mentioning that in this embodiment, the second arc chute is formed inside the moving path of the dynamic contact portion 21, and is provided in the carrying housing 11 itself, and does not occupy any extra radial space. And the shape of the electric arc can be restrained by controlling the shape and the width size of the first arc-extinguishing groove and the second arc-extinguishing groove, so that the electric arc is thinned and lengthened, and the arc extinguishing speed is accelerated. Therefore, the arrangement mode of the first arc extinguishing groove enables the electric isolating switch to accelerate the arc extinguishing speed and improve the arc extinguishing performance under the condition that the radial size of the electric isolating switch is not increased.

In another embodiment of the present application, the first magnetic element 31 is disposed outside the dynamic contact portion 21, and the first magnetic element 31 has a first magnetic pole and a second magnetic pole opposite to each other, wherein the first magnetic pole faces a moving path of the dynamic contact portion 21, and the second magnetic pole is far away from the first magnetic pole along a radial direction of the electrical contact assembly 20. The bearing shell 11 has a second mounting cavity 102 for mounting the first magnetic element 31 therein, the second mounting cavity 102 is located outside the first mounting cavity 101, and a cavity wall of the second mounting cavity 102 is made of an insulating material.

In this embodiment, the electrical isolation switch includes a first narrow space 41 and a second narrow space 42, the first narrow space 41 is located at a lower side of a movement path of the dynamic contact portion 21, and the second narrow space 42 is located at an upper side of the movement path of the dynamic contact portion 21.

Specifically, the first narrow space 41 is formed between the package housing 12 and the carrier housing 11 and located at the lower side of the first magnetic element 31, and the second narrow space 42 is formed between the package housing 12 and the carrier housing 11 and located at the upper side of the first magnetic element 31.

More specifically, in this embodiment, the gap between the carrier case 11 and the first magnetic element 31 forms the first narrow space 41, and the gap between the package case 12 and the first magnetic element 31 forms the second narrow space 42. The opening of the first narrow space 41 and the opening of the second narrow space 42 are both directed toward the dynamic contact portion 21, and the depth direction of the first narrow space 41 and the depth direction of the second narrow space 42 coincide with the radial direction of the housing assembly 10.

In another embodiment of the present application, the electrical isolation switch may be provided with only the first narrow space 41 located on the upper side of the movement path of the dynamic contact portion 21, or may be provided with only the second narrow space 42 located on the lower side of the movement path of the dynamic contact portion 21. In other embodiments of the present application, the first narrow space 41 and the second narrow space 42 may also be formed by other means.

It is worth mentioning that in this embodiment, the width dimension of the first narrow space 41 and the width dimension of the second narrow space 42 are consistent with the axial direction of the housing assembly 10, and in order to restrain the shape of the arc, the arc is narrowed, and the width dimension of the first narrow space 41 and the width dimension of the second narrow space 42 are narrower, so that the axial dimension of the electrical isolation switch can be reduced.

It is worth mentioning that the magnetic field generated by the magnetic element covers the movement path of the dynamic contact 21 as much as possible, and thus acts on the arc. Preferably, the shape of the first magnetic element 31 is in accordance with the movement path of the dynamic contact portion 21. Accordingly, in some embodiments of the present application, the first magnetic element 31 has an arc-shaped structure extending along the movement path of the dynamic contact portion 21. In other embodiments of the present application, the shape of the first magnetic element 31 may not completely conform to the movement path of the dynamic contact portion 21, for example, the first magnetic element 31 has a structure with a cross-sectional shape of a triangle, or a rectangle, or a trapezoid, which is not limited by the present application. Of course, the number of the first magnetic elements 31 may be increased, or the volume of the first magnetic elements 31 may be increased, so that the magnetic field generated by the first magnetic elements 31 covers the movement path of the dynamic contact portion 21 as much as possible, and thus acts on the arc.

Further, in order to allow the arc to smoothly enter the narrow space 40 by the magnetic field, it is preferable that the first narrow space 41 and the second narrow space 42 extend in the same manner as the first magnetic element 31.

In the present application, the electrical isolation switch can perform arc extinguishing in cooperation with the magnetic field generating element 30 and the narrow space 40, and accordingly, according to another aspect of the present application, there is also provided an arc extinguishing method of an electrical isolation switch, which includes: the arc generated by the electrical disconnector during the switching of states is guided into the at least one narrow space 40 by the magnetic field generating element 30.

In summary, an electrical disconnector and an arc extinguishing method thereof based on the embodiments of the present application are illustrated, in which an arc is guided by a magnetic field to deflect in a preset manner, and then the arc is rapidly drawn and elongated by physical intervention through a narrow space 40 disposed on a deflection path of the arc to achieve rapid arc extinguishing. And since the magnetic field can deflect the arc in a specific direction, the deflection path of the arc and the position of the narrow space 40 on the deflection path of the arc can be selectively and flexibly planned.

The present application and its embodiments are described above, the description is not limited, and what is shown in the drawings is only one of the embodiments of the present application, and the actual structure is not limited thereto. In summary, those skilled in the art should be able to conceive of the present invention without creatively designing the similar structural modes and embodiments to the technical solutions without departing from the spirit of the present invention.

Claims (16)

1. An electrical isolation switch, comprising: a housing assembly; an electrical contact assembly mounted to the housing assembly, wherein the electrical contact assembly includes at least one static contact and at least one dynamic contact, the dynamic contact being movable relative to the static contact to be adapted to control the electrical isolator to switch between an on-state and an off-state, the dynamic contact being in contact with the static contact when the electrical isolator is switched to the on-state, and the dynamic contact being spaced from the static contact when the electrical isolator is switched to the off-state; and at least one magnetic field generating element for deflecting an arc generated by the electrical disconnector during state switching; wherein the housing assembly forms at least one narrow space that is located on a deflection path of the arc.

2. The electrical isolator as claimed in claim 1, wherein the at least one magnetic field generating element comprises a first magnetic element corresponding to a path of motion of the dynamic contact along at least a portion of an axial direction of the electrical contact assembly.

3. An electrical disconnector according to claim 1 in which the at least one magnetic field generating element comprises a first magnetic element along a path of movement of the electrical contact assembly in a radial direction away from the dynamic contact.

4. The electrical disconnect switch of claim 2, wherein the first magnetic element has opposing first and second poles, wherein the first pole faces a path of motion of the dynamic contact and the second pole is distal from the first pole along an axial direction of the electrical contact assembly.

5. An electrical disconnect switch according to claim 4 wherein the at least one narrow space comprises a first narrow space located outside of a path of motion of the dynamic contact.

6. An electrical disconnect switch according to claim 5 wherein the at least one narrow space further comprises a second narrow space, the second narrow space being located inside a path of motion of the dynamic contact.

7. The electrical disconnect switch of claim 6, wherein the housing assembly comprises a carrier housing having a first mounting cavity for mounting the electrical contact assembly therein, wherein the carrier housing further has a first arc chute concavely formed therein, the first arc chute forming the first narrow space.

8. The electrical isolating switch according to claim 7, wherein the carrier housing further has a second arc chute concavely formed therein, the second arc chute forming the second narrow space.

9. An electrical disconnector according to claim 3 in which the first magnetic element has opposed first and second poles, in which the first pole faces the path of movement of the dynamic contact and the second pole faces away from the first pole in the radial direction of the electrical contact assembly.

10. An electrical disconnect switch according to claim 9 wherein the at least one narrow space comprises a first narrow space located on an underside of a path of motion of the dynamic contact.

11. The electrical disconnect switch of claim 10, wherein the at least one narrow space further comprises a second narrow space located on an upper side of a path of motion of the dynamic contact.

12. An electrical disconnector according to claim 6 or 11 in which the first magnetic element has an arcuate configuration extending along the path of movement of the dynamic contact.

13. An electrical disconnector according to claim 12 in which the first and/or second narrow spaces extend in a manner corresponding to the extension of the first magnetic element.

14. The electrical isolation switch of claim 11, wherein the housing assembly includes a carrier housing and a package housing covering the carrier housing, the carrier housing having a first mounting cavity for mounting the electrical contact assembly therein and a second mounting cavity for mounting the first magnetic element therein, the second mounting cavity being located outside the first mounting cavity, wherein the first narrow space is formed between the package housing and the carrier housing and is located at an underside of the first magnetic element.

15. The electrical isolation switch of claim 14, wherein the second narrow space is formed between the package housing and the carrier housing and on an upper side of the first magnetic element.

16. An arc extinguishing method for an electrical isolation switch, comprising: an arc generated when the electrical disconnection switch is switched to a state is guided into the narrow space by the magnetic field generating element.

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