CN117831974A - Electrical switch - Google Patents

Abstract

Embodiments of the present disclosure provide an electrical switch. The electrical switch includes a pair of stationary contacts spaced apart from each other; a pair of movable contacts matched with the pair of stationary contacts; a first magnetic member disposed between the pair of stationary contacts; and a pair of second magnetic members disposed adjacent to and spaced apart from the ends of the pair of stationary contacts, respectively, wherein the magnetic poles of the first magnetic member adjacent to the two ends of the pair of stationary contacts are opposite in direction, and the magnetic poles of the first magnetic member and the second magnetic member adjacent to each other are opposite in direction.

Description

Electrical switch

Technical Field

Embodiments of the present disclosure relate generally to the field of electrical equipment technology and, more particularly, to an electrical switch capable of nonpolar magnetic blowout.

Background

The moving and static contacts of the electric switch can generate electric arcs under the breaking condition, and the high energy generated by the electric arcs can cause the risk of burning, fusion welding and even breakdown of the contacts. Particularly for high-power electrical switches, if the arc cannot be extinguished quickly, the arc is more damaging to the structure and function of the electrical switch.

The main loop of the electric switch can adopt a direct current circuit or an alternating current circuit, and under the condition that the main loop adopts the direct current circuit or the alternating current circuit, the conventional electric switch cannot have good arc extinguishing capability at the same time, so that how to realize nonpolar magnetic arc extinguishing of the electric switch is a technical problem to be solved.

Disclosure of Invention

It is an object of the present disclosure to provide an electrical switch to at least partially solve the above-mentioned problems.

In one aspect of the present disclosure, an electrical switch is provided that includes a pair of stationary contacts spaced apart from each other; a pair of movable contacts matched with the pair of stationary contacts; a first magnetic member disposed between the pair of stationary contacts; and a pair of second magnetic members disposed adjacent to and spaced apart from the ends of the pair of stationary contacts, respectively, wherein the magnetic poles of the first magnetic member adjacent to the two ends of the pair of stationary contacts are opposite in direction, and the magnetic poles of the first magnetic member and the second magnetic member adjacent to each other are opposite in direction _。

According to the embodiment of the present disclosure, since the first magnetic member is disposed between the pair of stationary contacts, the pair of second magnetic members are disposed adjacent to and spaced apart from the ends of the pair of stationary contacts, respectively, the magnetic pole directions of the first magnetic member adjacent to the both ends of the pair of stationary contacts are opposite, and the magnetic pole directions of the first magnetic member and the second magnetic member adjacent to each other are opposite. Therefore, the magnetic field lines between the first magnetic piece and the corresponding second magnetic piece can pass through the corresponding contact positions of a group of opposite and static contacts, and the electric switch has good arc extinguishing capability no matter the main loop of the electric switch adopts a direct current circuit or an alternating current circuit, so that the nonpolar magnetic quenching of the electric switch is realized.

In some embodiments, one of the first magnetic member and the pair of second magnetic members comprises a permanent magnet and the other of the first magnetic member and the pair of second magnetic members comprises an electromagnet.

In some embodiments, the electrical switch further comprises a pair of wire members, a switch coil, a wire and a diode disposed on the wire, the electromagnet being disposed on the wire, both ends of the switch coil and both ends of the wire being connected to the pair of wire members, respectively, the pair of wire members being adapted to be connected to a control circuit of the electrical switch and being switchable between an energized state and a de-energized state, wherein with the pair of wire members in the energized state, the switch coil is energized and the diode is turned off, and during switching of the pair of wire members from the energized state to the de-energized state, the switch coil releases back emf and forms a current that can flow through the diode to energize and magnetize the electromagnet.

In some embodiments, the electromagnet includes a magnetically permeable coil disposed on the wire and a magnetically permeable member disposed on an end of the magnetically permeable coil adjacent the stationary contact, wherein the magnetically permeable member is capable of being magnetized by the magnetically permeable coil when the magnetically permeable coil is energized.

In some embodiments, the projections of the permanent magnets and the projections of the magnetic homogenizing members are staggered along the direction in which one of the pair of stationary contacts points to the other stationary contact point.

In some embodiments, along the direction in which one of the pair of stationary contacts points to the other stationary contact point, the projection of the permanent magnet and the projection of the magnetic homogenizing member at least partially overlap.

In some embodiments, the pair of wire members includes a first wire member and a second wire member, and both ends of the switching coil and both ends of the wire are connected to the first wire member and the second wire member, respectively.

In some embodiments, the electrical switch further comprises a moving switch, one end of the wire is connected to the first wire member, the other end of the wire is connected to the moving switch, the moving switch is switchable between an off position and an on position, wherein in case the moving switch is switched from the off position to the on position, the moving switch is movable towards and connected to the second wire member so that the other end of the wire is connectable to the second wire member.

In some embodiments, the electrical switch further comprises a base, the moving switch comprising a moving block provided on an outer side surface of the base and a connection block provided on an inner side surface of the base and connected to the moving block, the other end of the wire being connected to the connection block, wherein the connection block is movable toward and connected to the second connection member in a case where the moving switch is switched from the off position to the on position.

In some embodiments, the electrical switch further comprises a static contact plate connected with the static contact, a first glue-pouring groove and a second glue-pouring groove adjacent to the static contact plate are arranged on the base, the magnetic induction coil is arranged in the first glue-pouring groove, and the diode is arranged in the second glue-pouring groove.

It should be understood that what is described in this section is not intended to limit the key features or essential features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, wherein like or similar reference numerals denote like or similar elements, in which:

fig. 1 illustrates a schematic structural diagram of an electrical switch according to some embodiments of the present disclosure;

fig. 2 illustrates a schematic structural view of an electrical switch with a cover plate removed from the electrical switch, according to some embodiments of the present disclosure;

FIG. 3 shows a schematic structural view of the electrical switch shown in FIG. 2;

fig. 4 shows a schematic structural view of an electrical switch with a cover plate removed from the electrical switch according to further embodiments of the present disclosure.

Reference numerals illustrate:

100 is an electrical switch, 101 is a switch coil, 102 is a wire, 103 is a diode, and 104 is a cover plate;

1 is a base, 11 is a first glue pouring groove, 12 is a second glue pouring groove, and 13 is a winding post;

2 is a static contact assembly, 21 is a static contact, and 22 is a static contact plate;

3 is a movable contact;

4 is a wiring piece, 41 is a first wiring piece, and 42 is a second wiring piece;

5 is a first magnetic member;

6 is a second magnetic member;

71 is a permanent magnet, 72 is an electromagnet, 721 is a magnetic induction coil, 722 is a magnetic equalization member;

8 is a movable switch, 81 is a movable block, and 82 is a junction block.

Detailed Description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are illustrated in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like, may refer to different or the same object.

As described hereinabove, the main circuit of the electrical switch may employ a direct current circuit or an alternating current circuit, and in the case where the main circuit employs a direct current circuit or an alternating current circuit, the conventional electrical switch cannot simultaneously have a good arc extinguishing capability. Embodiments of the present disclosure provide an electrical switch to at least partially address the above-mentioned problems. Hereinafter, the principles of the present disclosure will be described with reference to fig. 1 to 4.

Fig. 1 illustrates a schematic structural diagram of an electrical switch 100 according to some embodiments of the present disclosure. Fig. 2 illustrates a schematic structural view of an electrical switch 100, with a cover plate 104 removed from the electrical switch 100, according to some embodiments of the present disclosure. Fig. 3 shows a schematic structural diagram of the electrical switch 100 shown in fig. 2. As shown in fig. 1 to 3, the electrical switch 100 described herein generally includes a base 1, a stationary contact assembly 2, a movable contact 3, a wiring member 4, a first magnetic member 5, a second magnetic member 6, a movable switch 8, a switching coil 101, a wire 102, and a diode 103. The base 1 serves as a mounting carrier. The base 1 and the cover 104 form an installation space (not shown in the drawings) in which the stationary contact assembly 2, the wiring member 4 and the movable switch 8 are partially disposed, and the movable contact 3, the first magnetic member 5, the second magnetic member 6, the switching coil 101, the wire 102 and the diode 103 are disposed.

Referring to fig. 1-3, in some embodiments, the stationary contact assembly 2 includes a pair of stationary contacts 21 and a pair of stationary contact plates 22, the stationary contacts 21 being connected to the respective stationary contact plates 22. The pair of stationary contacts 21 are spaced apart from each other. The stationary contact 21 is disposed in the installation space, and a portion of the stationary contact plate 22 can pass through the installation space. The movable contacts 3 are arranged in pairs, and the pairs of movable contacts 3 are mated with the pairs of stationary contacts 21. The pair of movable contacts 3 can move toward or away from the pair of stationary contacts 21, wherein the electrical switch 100 is in a closed state with the pair of movable contacts 3 connected to the pair of stationary contacts 21, and the main circuit is conductive; when the pair of movable contacts 3 and the pair of stationary contacts 21 are disconnected, the electric switch 100 is in the open state, and the main circuit is disconnected.

Referring to fig. 1-3, in some embodiments, the pair of wire members 4 are adapted to be connected to a control circuit of the electrical switch 100, and the pair of wire members 4 are switchable between an energized state and a de-energized state. Both ends of the switching coil 101 may be connected to the pair of wire members 4, respectively.

Obviously, in the case where the pair of wire members 4 are in the energized state, the switching coil 101 is energized. The switching coil 101 can generate a magnetic field, and the switching coil 101 can generate an electromagnetic force to the armature. The armature is connected to the movable contact 3. If the electromagnetic force is larger than the elastic force of the elastic sheet between the movable contact and the static contact, the movable contact 3 can move towards the static contact 21 under the driving of the armature until being connected with the static contact 21. In the case where the pair of wire members 4 are in the deenergized state, the switching coil 101 is deenergized, the switching coil 101 generates a magnetic field of gradually decreasing strength, and the electromagnetic force received by the armature is also gradually decreased. In the case where the electromagnetic force is reduced to be smaller than the elastic force, the elastic piece releases the energy, and the movable contact 3 and the stationary contact 21 start to separate.

With continued reference to fig. 1-3, the first magnetic member 5 is disposed between the pair of stationary contacts 21. The pair of second magnetic members 6 are respectively disposed adjacent to the ends of the pair of stationary contacts 21 facing away from each other, and the pair of second magnetic members 6 are spaced apart from the pair of stationary contacts 21. Obviously, the magnetic pole directions of the two ends of the first magnetic member 5 adjacent to the pair of stationary contacts 21 are opposite, while the magnetic pole directions of the one ends of the first magnetic member 5 and the second magnetic member 6 adjacent to each other are also opposite.

With the above configuration, the magnetic field lines between the first magnetic member 5 and the corresponding second magnetic member 6 can pass through the contact positions of the corresponding set of paired, stationary contacts. Therefore, no matter the main circuit of the electric switch 100 adopts a direct current circuit or an alternating current circuit, under the condition that an arc is generated between the movable contact and the static contact, an included angle can be formed between the magnetic field line and the arc, so that the arc can be elongated under the action of electromagnetic force in the magnetic field, and finally, nonpolar magnetic blowout is realized.

It should be noted that the first magnetic member 5 and the pair of second magnetic members 6 according to the embodiment of the present disclosure may be various types of magnetic members currently known or available in the future, and the embodiment of the present disclosure is not limited thereto. For example, one of the first magnetic member 5 and the pair of second magnetic members 6 includes a permanent magnet 71, and the other of the first magnetic member 5 and the pair of second magnetic members 6 includes an electromagnet 72.

With continued reference to fig. 1-3, in some embodiments, the first magnetic member 5 may include a permanent magnet 71. The second magnetic member 6 may include an electromagnet 72. The wires 102 may be arranged in pairs and the diodes 103 also in pairs. Both ends of each wire 102 are connected to the pair of wire members 4, respectively. Each electromagnet 72 is disposed on each wire 102. Each diode 103 is also provided on each wire 102. With the above configuration, when the pair of wire members 4 are in the energized state, the switching coil 101 is energized and the diode 103 is turned off, so that no current flows through the electromagnet 72, and the second magnetic member 6 is nonmagnetic. It can be seen that in the case where the paired wire members 4 are in the energized state, no electric arc is formed between the movable and stationary contacts because the movable and stationary contacts are connected, and therefore no energization and magnetization are required on the electromagnet 72. While during the switching of the pair of wire members 4 from the energized state to the de-energized state, the switching coil 101 releases the back electromotive force and forms a current that can flow through the diode 103 to energize and magnetize the electromagnet 72. It can be seen that in the process of switching the pair of wire members 4 from the energized state to the de-energized state, the moving and stationary contacts are separated, so that an arc is formed between the moving and stationary contacts, and therefore the electromagnet 72 needs to be energized and magnetized to magnetically blow the arc between the moving and stationary contacts. In addition, since the current in the electromagnet 72 is formed via the back electromotive force released in the switching coil 101, that is, this current comes from the control circuit, the power consumption of the electrical switch 100 of the embodiment of the present disclosure is significantly reduced compared to supplying power to the electromagnet 72 by an additional power source, thereby enhancing the energy saving effect of the electrical switch 100.

Further, since the switching coil 101 is energized and the electromagnet 72 is not energized with the pair of wire members 4 in the energized state, the shunting of the switching coil 101 by the electromagnet 72 can be avoided, thereby avoiding affecting the closing speed.

It should be noted that, through experimental tests, the time for the switching coil 101 to release the back electromotive force is generally 30ms to 100ms, and the time for the back electromotive force is longer than the time for generating the arc, so the electrical switch 100 in the embodiment of the present disclosure can implement the function of nonpolar magnetic quenching.

The electromagnet 72 according to the embodiments of the present disclosure may be various types of electromagnets 72 currently known or available in the future, as the embodiments of the present disclosure are not limited in this respect. For example, with continued reference to fig. 3, in some embodiments, the electromagnet 72 may include a magnetically permeable coil 721 and a magnetically permeable member 722. A magnetic induction coil 721 may be provided on the wire 102, and the magnetic induction coil 721 may be connected in series with the diode 103. The magnetism equalizing member 722 may be disposed on an end of the magnetism inducing coil 721 adjacent to the stationary contact 21 for cooperating with an adjacent permanent magnet 71 and forming a magnetism inducing wire. Obviously, in the case that the magnetic induction coil 721 is energized, the magnetism equalizing member 722 can be uniformly magnetized by the magnetic induction coil 721, thereby significantly improving the magnetic blowing effect of the arc.

In some embodiments, the projection of the permanent magnet 71 may at least partially overlap with the projection of the magnetism homogenizing member 722 along the direction in which one of the pair of stationary contacts 21 points to the other stationary contact 21. Further, in the case where the projection of the permanent magnet 71 and the projection of the magnetism equalizing member 722 are completely overlapped, then the direction of the magnetic field lines between the permanent magnet 71 and the magnetism equalizing member 722 is parallel to the direction in which one of the pair of stationary contacts 21 points to the other stationary contact 21. With continued reference to fig. 3, in other embodiments, the projection of the permanent magnet 71 may also be offset from the projection of the magnetic homogenizing member 722 along the direction in which one of the pair of stationary contacts 21 points toward the other stationary contact 21.

Obviously, by adjusting the winding direction of the wires in each magnetic induction coil 721, the magnetic pole directions of the paired magnetism equalizing members 722 and the ends of the permanent magnets 71 adjacent to each other can be made opposite. Therefore, the magnetic field lines between the first magnetic element 5 and the corresponding second magnetic element 6 can pass through the contact positions of the corresponding set of opposite and static contacts, and the electric switch 100 has good arc extinguishing capability no matter the main loop of the electric switch 100 adopts a direct current circuit or an alternating current circuit, so that the nonpolar magnetic quenching of the electric switch 100 is realized.

With continued reference to fig. 2-3, in some embodiments, the pair of wire members 4 may include a first wire member 41 and a second wire member 42. Both ends of the switching coil 101 may be connected to the first and second wire members 41 and 42, respectively. Both ends of each wire 102 may also be connected to the first and second wire members 41 and 42, respectively. In the case where the pair of wire members 4 are in the energized state, the current can flow to the second wire member 42 through the first wire member 41 via the switching coil 101, and the current can also flow to the first wire member 41 through the second wire member 42 via the switching coil 101. The operation principle of the electrical switch 100 will be described below in the case where an electric current flows through the second wire member 42 to the first wire member 41 via the switching coil 101, that is, the second wire member 42 is positive, and the first wire member 41 is negative.

With continued reference to fig. 2 to 3, with the pair of wire members 4 in the energized state, current flows through the second wire member 42 to the first wire member 41 via the switching coil 101, the diode 103 is turned off, and the magnetic induction coil 721 is not energized. While in the process of switching the pair of wiring members 4 from the energized state to the de-energized state, the switching coil 101 releases back electromotive force and forms a current that can flow from the first wiring member 41 to the second wiring member 42 through each of the wires 102, the diode 103 is turned on, a current is supplied to the magnetically induced coil 721, and the magnetically induced coil 721 can magnetize the magnetically uniforming member 722. Thus, a stable magnetic field can be formed between the first magnetic member 5 and the corresponding second magnetic member 6.

With continued reference to fig. 2-3, in some embodiments, the base 1 may be provided with a first glue-pouring channel 11 and a second glue-pouring channel 12, wherein the first glue-pouring channel 11 may be adjacent to the stationary contact plate 22, and the second glue-pouring channel 12 may be adjacent to the stationary contact plate 22. The magnetic induction coil 721 is disposed in the first glue-pouring groove 11, and then glue is poured into the first glue-pouring groove 11. The diode 103 is disposed in the second glue tank 12, and then glue is filled in the second glue tank 12. It can be seen that since the magnetic induction coil 721 and the diode 103 are adjacent to the stationary contact plate 22, respectively, by potting the potting compound in the potting compound tank, the current on the stationary contact plate 22 can be prevented from flowing into the magnetic induction coil 721 or the diode 103, thereby avoiding the risk of dielectric breakdown.

Further, the base 1 may be provided with a winding post 13, and the wire 102 may be fixed to the base 1 through the winding post 13.

With continued reference to fig. 2 to 3, specifically, the movement switch 8 is provided on the base 1. One end of the wire 102 may be connected to the first wire 41, and the other end of the wire 102 may be connected to the moving switch 8. The moving switch 8 is switchable between an off position and an on position, wherein in the case where the moving switch 8 is switched from the off position to the on position, the moving switch 8 is movable toward the second wire 42, and the moving switch 8 is movable to a position to be on with the second wire 42, so that the other end of the wire 102 is connectable to the second wire 42.

It should be noted that the movable switch 8 may control whether the other end of the wire 102 is connectable to the second connection member 42. Obviously, if the electrical switch 100 cuts off the main circuit by another switch before the moving and stationary contacts are separated, no current flows in the main circuit. In this case, even if the movable and stationary contacts are separated, an arc is not generated between the movable and stationary contacts, and therefore the movable switch 8 can be switched to the off position so that the electromagnet 72 is always in the non-on state and so that the electromagnet 72 does not participate in the operation, thereby increasing the service life of the electric switch 100 and also enhancing the energy saving effect.

The mobile switch 8 according to embodiments of the present disclosure may be any type of switch currently known or available in the future, as embodiments of the present disclosure are not limited in this regard. For example, in some embodiments, the movable switch 8 may include a movable block 81 and a junction block 82. A moving block 81 may be provided on the outer side surface of the base 1 for convenience of operation of a worker. The connection block 82 may be provided on the inner side surface of the base 1, and the connection block 82 may be connected with the moving block 81. The other end of the wire 102 may be connected to the junction block 82. In the case where the movable switch 8 is switched from the off position to the on position, the junction block 82 can be moved toward the second wiring member 42, and the junction block 82 can be moved to the position of being turned on with the second wiring member 42, more specifically, the junction block 82 can be connected with the post on the second wiring member 42, so that the other end of the wire 102 can be connected with the second wiring member 42.

Fig. 4 shows a schematic structural view of an electrical switch 100 with a cover plate 104 removed from the electrical switch 100 according to further embodiments of the present disclosure. The electrical switch 100 shown in fig. 4 has a similar structure to the electrical switch 100 shown in fig. 2 to 3, mainly in that the first magnetic member 5 shown in fig. 4 includes an electromagnet 72, and the pair of second magnetic members 6 shown in fig. 4 includes a permanent magnet 71. Hereinafter, the distinction between the two will be mainly described, and for the same parts, a detailed description will be omitted.

As shown in fig. 4, the electrical switch 100 described herein generally includes a base 1, a stationary contact assembly 2, a movable contact 3, a wire member 4, a first magnetic member 5, a second magnetic member 6, a movable switch 8, a switching coil 101, a wire 102, and a diode 103. The base 1 serves as a mounting carrier. The base 1 and the cover 104 form an installation space in which the stationary contact assembly 2, the connection element 4 and the movable switch 8 are partially disposed, and the movable contact 3, the first magnetic element 5, the second magnetic element 6, the switching coil 101, the conductor 102 and the diode 103 are disposed. The structures of the base 1, the stationary contact assembly 2, the movable contact 3, the wire connecting member 4, the movable switch 8, the switch coil 101, the wire 102, and the diode 103 are similar to those described above in connection with fig. 2 to 3, and the mounting positions of the first magnetic member 5 and the second magnetic member 6 are also similar to those described above in connection with fig. 2 to 3, and will not be repeated here.

With continued reference to fig. 4, in some embodiments, the number of wires 102, diodes 103, and magnetic induction coils 721 are one, respectively, and the number of permanent magnets 71 is two. Obviously, the cost of the electrical switch 100 shown in fig. 4 is significantly reduced and the internal layout and routing of the electrical switch 100 shown in fig. 4 is simpler than the arrangement of the wires 102, the diodes 103 and the magnetic induction coils 721 in the electrical switch 100 shown in fig. 2 to 3, respectively, in pairs.

With continued reference to fig. 4, in some embodiments, the magnetic field homogenizing members 722 are disposed at both ends of the magnetic induction coil 721 adjacent to the pair of stationary contacts 21, respectively, and the magnetic pole directions of the pair of magnetic field homogenizing members 722 are opposite, and the magnetic pole directions of the pair of magnetic field homogenizing members 722 and the ends of the pair of permanent magnets 71 adjacent to each other are opposite. Therefore, the magnetic field lines between the first magnetic element 5 and the corresponding second magnetic element 6 can also pass through the contact positions of the corresponding set of opposite and stationary contacts, and the electric switch 100 has good arc extinguishing capability no matter the main loop of the electric switch 100 adopts a direct current circuit or an alternating current circuit, so that the nonpolar magnetic quenching of the electric switch 100 is realized.

It should be noted that, in other embodiments, the first magnetic member 5 may include the permanent magnet 71, and the second magnetic member 6 may also include the permanent magnet 71. In other embodiments, the first magnetic member 5 may also include an electromagnet 72, and the second magnetic member 6 may also include an electromagnet 72, as embodiments of the present disclosure are not limited in this regard.

The magnetic blow-out design according to embodiments of the present disclosure may be applied to various types of electrical switches 100 to achieve nonpolar magnetic blow-out of the electrical switch 100. It should be appreciated that the types of electrical switches 100 include, but are not limited to, relays and contactors, as embodiments of the present disclosure are not limited in this regard.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (10)

1. An electrical switch (100), characterized in that the electrical switch (100) comprises:

a pair of stationary contacts (21) spaced apart from each other;

a pair of movable contacts (3) which are matched with the pair of stationary contacts (21);

a first magnetic member (5) disposed between the pair of stationary contacts (21); and

-a pair of second magnetic elements (6), the pair of second magnetic elements (6) being arranged adjacent to the ends of the pair of stationary contacts (21) facing away from each other and being spaced apart from the pair of stationary contacts (21), respectively, wherein the magnetic pole directions of the first magnetic element (5) adjacent to the ends of the pair of stationary contacts (21) are opposite, and the magnetic pole directions of the first magnetic element (5) and the second magnetic element (6) adjacent to each other are opposite.

2. The electrical switch (100) according to claim 1, wherein one of the first magnetic member (5) and the pair of second magnetic members (6) comprises a permanent magnet (71), and the other of the first magnetic member (5) and the pair of second magnetic members (6) comprises an electromagnet (72).

3. The electrical switch (100) according to claim 2, wherein the electrical switch (100) further comprises a pair of wires (4), a switching coil (101), a wire (102) and a diode (103) arranged on the wire (102), the electromagnet (72) being arranged on the wire (102), both ends of the switching coil (101) and both ends of the wire (102) being connected to the pair of wires (4) respectively, the pair of wires (4) being adapted to be connected to a control circuit of the electrical switch (100) and switchable between an energized state and a de-energized state, wherein the switching coil (101) is energized and the diode (103) is turned off in case the pair of wires (4) is in the energized state, and during switching of the pair of wires (4) from the energized state to the de-energized state the switching coil (101) releases back emf and forms an electric current, which can flow through the diode (103) to energize the electromagnet (72).

4. An electrical switch (100) according to claim 3, characterized in that the electromagnet (72) comprises a magnetically induced coil (721) arranged on the wire (102) and a magnetically homogenizing element (722) arranged on an end of the magnetically induced coil (721) adjacent to the stationary contact (21), wherein the magnetically homogenizing element (722) is capable of being magnetized by the magnetically induced coil (721) upon energizing the magnetically induced coil (721).

5. The electrical switch (100) of claim 4, wherein the projections of the permanent magnets (71) and the projections of the magnetic uniforming members (722) are staggered along the direction in which one of the stationary contacts (21) of the pair of stationary contacts (21) points to the other stationary contact (21).

6. The electrical switch (100) according to claim 4, wherein the projection of the permanent magnet (71) and the projection of the magnetic homogenizing member (722) at least partially overlap along the direction in which one of the stationary contacts (21) of the pair of stationary contacts (21) points to the other stationary contact (21).

7. The electrical switch (100) according to claim 4, wherein the pair of wire members (4) includes a first wire member (41) and a second wire member (42), both ends of the switch coil (101) and both ends of the wire (102) being connected to the first wire member (41) and the second wire member (42), respectively.

8. The electrical switch (100) according to claim 7, wherein the electrical switch (100) further comprises a moving switch (8), one end of the wire (102) being connected to the first wire member (41), the other end of the wire (102) being connected to the moving switch (8), the moving switch (8) being switchable between an off position and an on position, wherein the moving switch (8) is movable towards the second wire member (42) and connected to the second wire member (42) in case the moving switch (8) is switched from the off position to the on position, such that the other end of the wire (102) is connectable to the second wire member (42).

9. The electrical switch (100) according to claim 8, wherein the electrical switch (100) further comprises a base (1), the moving switch (8) comprising a moving block (81) provided on an outer side of the base (1) and a junction block (82) provided on an inner side of the base (1) and connected to the moving block (81), the other end of the wire (102) being connected to the junction block (82), wherein the junction block (82) is movable towards the second junction piece (42) and connected to the second junction piece (42) in case the moving switch (8) is switched from the off position to the on position.

10. The electrical switch (100) according to claim 9, wherein the electrical switch (100) further comprises a stationary contact plate (22) connected to the stationary contact (21), the base (1) is provided with a first glue-pouring slot (11) and a second glue-pouring slot (12) adjacent to the stationary contact plate (22), the magnetic induction coil (721) is arranged in the first glue-pouring slot (11), and the diode (103) is arranged in the second glue-pouring slot (12).