CN119864258A

CN119864258A - Contactor

Info

Publication number: CN119864258A
Application number: CN202510058079.1A
Authority: CN
Inventors: 司烽楷; 刘波; 刘振邦; 樊钊; 陈万兴
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2025-01-14
Filing date: 2025-01-14
Publication date: 2025-04-22

Abstract

The application relates to the technical field of electrical structures, in particular to a contactor. The contactor comprises an electromagnetic assembly, a movable contact assembly, a fixed contact assembly and a first elastic piece, wherein the movable contact assembly comprises a movable armature, a conductive beam and a movable contact, the movable armature is connected to one side of a conductive Liang Beili fixed armature, the movable contact is connected to one side of the conductive beam, which faces the fixed armature, the fixed contact assembly comprises a fixed contact which is arranged between the movable contact assembly and the fixed armature and is opposite to the movable contact, the first elastic piece is arranged between the movable contact assembly and the fixed part, after an exciting coil is electrified, the fixed armature attracts the movable armature to move and drives the movable contact to move to a first position which is contacted with the fixed contact, and after the exciting coil is powered off, the first elastic piece drives the movable contact to move to a second position which is separated from the fixed contact. When the contactor is a three-phase alternating current contactor, the improved structure can effectively avoid the synchronization deviation between the movable contact and the static contact and avoid the phase failure phenomenon caused by poor contact of part of the contacts.

Description

Contactor

Technical Field

The application relates to the technical field of electrical structures, in particular to a contactor.

Background

The contactor in the related art has the working principle that the electromagnet is utilized to drive the movable contact to be closed or separated from the static contact, so that the purpose of closing on or opening off a switching circuit is achieved, and the contactor is suitable for starting or controlling a motor or other electric equipment. The main structure of the contactor comprises a movable armature, a fixed armature, a reset spring, an exciting coil, a movable contact, a fixed contact and an insulating support rod, wherein one end of the insulating support rod is connected with the movable armature, the other end of the insulating support rod is connected with the movable contact, when the two ends of the exciting coil are connected with a power supply, the movable armature moves towards the fixed armature under the action of magnetic force generated by the exciting coil and is closed with the fixed armature, the insulating support rod connected with the movable armature drives the movable contact to be linked together, so that the movable contact is closed with the fixed contact, an external circuit is connected, when the exciting power supply on the exciting coil is disconnected, the fixed armature and the exciting coil lose magnetism, the movable armature is separated from the fixed armature under the action of the reset spring, and the insulating support rod connected with the movable armature drives the movable contact to be linked together, so that the movable contact is reset along with the movable contact and is separated from the fixed contact.

The contactor is prone to the problem that the maximum distance between the movable contact and the stationary contact increases slightly during use. When the fixed armature and the movable armature are attracted, poor contact or smaller contact surface can occur between the movable contact and the fixed contact, virtual connection occurs, the condition that an electric arc exists between the movable contact and the fixed contact can be further aggravated, the time of a switching device breaking a fault circuit can be prolonged due to the existence of the electric arc, the damage of a short circuit fault of a power system is further aggravated, the melting of the surface of the contact is further aggravated, the contact is evaporated and sputtered to a surrounding space, the contact is further thinned, the gap between the contacts is further increased, the maximum distance between the movable contact and the fixed contact is further increased, and finally the fixed contact and the movable contact cannot be connected. When the contactor is used for switching open and switching off of a plurality of phases, such as an ac contactor, a partial phase loss of the ac contactor is eventually caused.

The prior patent documents mostly add some control circuits in the alternating current contactor so as to control the contactor to be disconnected through related circuits when the contactor has the problem of phase failure and the like, for example, the patent of the patent number CN2301806Y provides an alternating current contactor with the phase failure protection, an alternating current contactor and a normally open contact are additionally arranged on the protected alternating current contactor, the circuit protection device can be disconnected in time when the protected alternating current contactor is in the phase failure, the patent of the patent number CN205864059U provides a standby power supply for the phase failure alternating current contactor, and the alternating current contactor after the phase failure continues to work normally by realizing the switching of a main power supply and a standby power supply loop when the phase failure occurs in the alternating current contactor. The above patents are all that when the abnormal condition occurs in the ac contactor, the circuit control and the standby power supply are added, the power supply is cut off or switched to complete the disconnection of the abnormal contactor or continue to normally work, but the problems of how to prevent the phase failure of the ac contactor are not considered, so that the cost of the schemes is higher, and the schemes are difficult to apply to actual production.

Disclosure of Invention

In order to solve the technical problems, the application provides a contactor.

According to an embodiment of the present application, there is provided a contactor including:

The electromagnetic assembly comprises a fixed armature, an iron core and an excitation coil sleeved on the iron core;

the movable contact point assembly comprises a movable armature, a conductive beam and a movable contact, wherein the movable armature is connected to one side of the conductive Liang Beili, which faces the fixed armature, and the movable contact is connected to one side of the conductive beam, which faces the fixed armature;

the fixed contact assembly comprises a fixed contact which is arranged between the movable contact assembly and the fixed armature and is opposite to the movable contact;

the first elastic piece is arranged between the movable contact point assembly and the fixed part;

After the exciting coil is electrified, the fixed armature attracts the movable armature to move and drives the movable contact to move to a first position contacting with the stationary contact, and after the exciting coil is powered off, the first elastic piece drives the movable contact to move to a second position separated from the stationary contact.

Further, the movable contact point assembly comprises two movable contact points, the two movable contact points are distributed at two ends of the conductive beam, and the movable contact points in the movable contact point assembly are in one-to-one correspondence with the movable contact points.

Further, the movable armatures are arranged in one-to-one correspondence with the movable contacts.

Further, the contactor is an alternating current contactor, and the movable contact assembly and the stationary contact assembly are respectively provided with three groups.

Further, a first connecting piece is arranged on the fixed part, a second connecting piece is arranged on the movable contact point assembly, the first connecting piece and the second connecting piece can be connected in a matching way in the process that the movable contact point assembly moves close to or far away from the fixed contact point, the movable contact point is limited at a third position in the state that the first connecting piece and the second connecting piece are connected in a matching way, and the second position is located between the first position and the third position;

The contactor also includes a drive assembly configured to drive movement of the movable contact such that the movable contact is restrained in the third position by the first and second connectors.

Further, the electromagnetic assembly further comprises a bracket and a locking mechanism, and the driving assembly comprises a second elastic piece;

When the locking mechanism is in a locking state, the fixed armature is in locking connection with the bracket through the locking mechanism, and the second elastic piece is in an energy storage state and has a trend of enabling the fixed armature to move towards the movable contact assembly;

when the locking mechanism is in an unlocking state, the fixed armature is unlocked from the bracket, and moves towards the movable contact point assembly under the action of the second elastic piece and pushes the movable contact point to at least move to the third position.

Further, the stationary contact assembly is fixedly connected with the stationary armature, and when the locking mechanism is in an unlocking state, the stationary armature pushes the movable contact to move under the action of the second elastic piece through the stationary contact assembly.

Further, when the locking mechanism is in the unlocking state, after the second elastic piece is restored to the stable state, the stationary contact is separated from the movable contact in the third position.

Further, the first connecting piece and the second connecting piece are hooks, the first connecting piece is a hook with an opening facing away from the fixed armature, the second connecting piece is a hook with an opening facing towards the fixed armature, or

The first connecting piece and the second connecting piece are magnetic pieces, or

The first connecting piece and the second connecting piece are all buckles.

Further, the contactor further includes:

A current transformer configured to detect whether or not there is a current between the movable contact and the stationary contact when the contactor is in a closed state;

And a controller configured to control a state of the locking mechanism according to a detection result of the current transformer.

In the embodiment of the application, the contact limit is not existed in the mutual movement process of the movable armature and the fixed armature, the movement stroke of the movable contact is not determined by the distance between the movable armature and the fixed armature, wherein the movable armature is still used for generating magnetic force action with the fixed armature to drive the movable contact to move, but the movement stroke of the movable contact is completely determined by the specific position of the fixed contact, namely, after the exciting coil is electrified, the fixed armature attracts the movable armature to move towards the fixed armature until the movable contact driven by the movable armature is abutted against the fixed contact, and at the moment, mutual extrusion force is generated between the movable contact and the fixed contact due to the magnetic attraction of the fixed armature to the movable armature, so that the contact connection is more stable.

The motion travel of the movable contact is determined by the position of the fixed contact, but not by the distance between the movable armature and the fixed armature, and after the movable contact is closed with the fixed contact, the movable contact and the fixed contact are in closer contact due to the extrusion force generated by the magnetic force, so that the contact resistance is reduced, and the occurrence of electric arcs is reduced. The design avoids the problems of poor contact, virtual connection, phase failure and the like caused by factors such as abrasion, ablation or deformation between the movable contact and the fixed contact, improves the reliability and the service life of the contactor, and is suitable for various scenes such as motor control, power supply switching and the like in an industrial power system. When the contactor is a three-phase alternating current contactor, the improved structure can effectively avoid the synchronization deviation between the movable contact and the fixed contact and avoid the phase loss phenomenon caused by poor contact of part of the contacts.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application. In the drawings:

FIG. 1 is a schematic view of a related art contactor;

fig. 2 is a schematic structural diagram of a single-phase contactor according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a three-phase contactor according to an embodiment of the present application;

Fig. 4 is a schematic structural view of a movable contact assembly in a contactor according to an embodiment of the present application;

fig. 5 is a schematic structural view of another movable contact assembly in the contactor according to the embodiment of the present application;

fig. 6 is a schematic structural diagram of another three-phase contactor according to an embodiment of the present application;

Fig. 7 is a schematic structural view of a locking mechanism in the contactor according to the embodiment of the present application;

Fig. 8 is a schematic diagram showing the structure of the contactor under different working conditions according to the embodiment of the present application.

In the figure:

1', a movable armature, 2', a fixed armature, 3', a return spring, 4', an exciting coil, 5', a movable contact, 6', a static contact and 7', an insulating support rod;

100. electromagnetic assembly 110, fixed armature 120, iron core 130, exciting coil 140, bracket 151, I-shaped key 152, first key slot 153, second key slot;

200. The movable contact point assembly 210, the movable armature 220, the conductive beam 230, the movable contact point 240 and the second connecting piece;

300. stationary contact assembly 310, stationary contact 320, fixing piece;

400. A first elastic member;

500. 510, the first connecting piece;

600. and a second elastic member.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the foregoing figures are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements expressly listed but may include other elements not expressly listed or inherent to such article or apparatus.

In the present application, the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", "middle", "outer", and the like are based on the azimuth or positional relationship shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, the term "coupled" may be a fixed connection, a removable connection, or a unitary construction, may be a mechanical connection, or an electrical connection, may be a direct connection, or may be an indirect connection via an intermediary, or may be an internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

A structure of an ac contactor in the related art is shown in fig. 1. The working principle of the contactor is that the electromagnet is utilized to drive the movable contact 5 'and the static contact 6' to be closed or separated, so that the purpose of switching on or switching off a switching-on/switching-off circuit is achieved, and the contactor is suitable for starting or controlling a motor or other electric equipment. The main structure of the contactor comprises a movable armature 1', a fixed armature 2', a return spring 3', an exciting coil, a movable contact 5', a fixed contact 6' and an insulating support rod 7', wherein one end of the insulating support rod 7' is connected with the movable armature 1', the other end of the insulating support rod 7' is connected with the movable contact 5', when the two ends of the exciting coil are connected with a power supply, the movable armature 1' moves towards the fixed armature 2' under the action of magnetic force generated by the exciting coil and is closed with the fixed armature 2', the insulating support rod 7' connected with the movable armature 1' drives the movable contact 5' to be linked together, so that the movable contact 5' is closed with the fixed contact 6', an external circuit is connected with the fixed contact, the process is a closing process, when the exciting coil on the exciting coil is disconnected, the fixed armature 2' and the exciting coil 4' are demagnetized, the movable armature 1' is separated from the fixed armature 2' under the action of the return spring 3', and the insulating support rod 7' connected with the movable armature 1' drives the movable contact 5' to be closed together, so that the movable contact 5' is reset along with the fixed contact and separated from the fixed contact 6', and the movable contact is closed along with the fixed contact, and the fixed contact 6', and the external circuit is disconnected.

The working process of the contactor shown in fig. 1 is analyzed, and it is not difficult to find that the movement stroke of the movable contact 5' (the maximum distance between the fixed armature 2' and the movable armature 1 ') is fixed and unchanged in the working process, and the movement stroke of the movable armature 1', that is, the maximum distance between the movable armature 1' and the fixed armature 2', is identical to the maximum distance between the movable contact 5' and the fixed contact 6', that is, the contact cooperation between the movable contact 5' and the fixed contact 6' is just completed after the fixed armature 2' is attracted with the movable armature 1', in order to realize the closing effect of the movable contact 6 '. However, the contactor is liable to have a problem in that the maximum distance between the movable contact 5 'and the stationary contact 6' is slightly increased during use. There are various reasons why the maximum distance between the movable contact 5 'and the stationary contact 6' may be slightly increased, for example, during a very short period of time when the movable contact 5 'approaches the stationary contact 6' but the movable contact 5 'and the stationary contact 6' are not closed, a spark arc may be generated between the movable contact 5 'and the stationary contact 6' to ablate the two contacts, or during a very short period of time when the movable contact 5 'leaves the stationary contact 6' but the two contacts are still closer, a spark arc may be generated between the movable contact 5 'and the stationary contact 6' to ablate the two contacts, ablation may cause melting or deformation of the contact surface material, so that the maximum distance between the movable contact 5 'and the stationary contact 6' may be slightly increased, and further, as the movable contact 5 'and the stationary contact 6' are frequently used, the contact may be deformed over time, so that the maximum distance between the movable contact 5 'and the stationary contact 6' may be slightly increased, and further, as the maximum distance between the movable contact 5 'and the stationary contact 6' may be slightly increased, and further, the problem of the maximum distance between the movable contact and the contacts may not be caused even when the contact is still being processed.

After the situation that the maximum distance between the movable contact 5' and the fixed contact 6' is slightly increased, when the fixed armature 2' and the movable armature 1' are attracted, poor contact or smaller contact surface between the movable contact 5' and the fixed contact 6' may occur, the situation that an arc exists between the movable contact 5' and the fixed contact 6' is further aggravated, the time of switching on and off a fault circuit of the switching device is prolonged due to the existence of the arc, the damage of a short circuit fault of a power system is aggravated, the melting, evaporation and sputtering of the surface of the contact are further aggravated, the surrounding space is further thinned, the gap between the contacts is further increased, and the maximum distance between the movable contact 5' and the fixed contact 6' is further increased, so that the fixed contact and the movable contact 5' cannot be connected finally. When the contactor is used for multi-phase opening and closing, for example, the alternating current contactor is provided with six pairs of moving contacts 5 'and fixed contacts 6' in total, because the six moving contacts 5 'of the alternating current contactor are fixed together, six moving contacts 5' are synchronously controlled by the moving armature 1 'and the insulating support rod 7', if the maximum distance between part of the moving contacts 5 'and the fixed contacts 6' is increased, the situation that part of the moving contacts 5 'and the fixed contacts 6' are in virtual connection can be caused when the moving armature 1 'is attracted with the fixed armature 2', and the partial phase failure of the alternating current contactor can be finally caused.

Based on this, as shown in fig. 2 and 3, the structure of the contactor provided in the embodiment of the present application mainly includes an electromagnetic assembly 100, a movable contact assembly 200, a stationary contact assembly 300, and a first elastic member 400. The electromagnetic assembly 100 mainly comprises a fixed armature 110, an iron core 120 and an excitation coil 130 sleeved on the iron core 120, the movable contact assembly 200 comprises a movable armature 210, a conductive beam 220 and a movable contact 230, the movable armature 210 is connected to one side of the conductive beam 220, which faces away from the fixed armature 110, the movable contact 230 is connected to one side of the conductive beam 220, which faces towards the fixed armature 110, the fixed contact assembly 300 comprises a fixed contact 310, the fixed contact 310 is arranged between the movable contact assembly 200 and the fixed armature 110, the fixed contact 310 is opposite to the movable contact 230, and the first elastic piece 400 is arranged between the movable contact assembly 200 and the fixed portion 500.

The exciting coil 130 may generate magnetic force to drive the movement of the moving armature 210 through the fixed armature 110 by controlling the energization and de-energization, and the moving contact assembly 200 is used for synchronous movement under the driving of the moving armature 210. The stationary contact 310 of the stationary contact assembly 300 is disposed between the movable contact assembly 200 and the stationary armature 110 and is disposed opposite to the movable contact 230, and the stationary contact 310 may be disposed between the movable contact assembly 200 and the stationary armature 110 by a fixing member 320 to be fixedly connected with a device housing or other structure, so as to avoid a positional deviation due to vibration or external force. The first elastic member 400 is used for storing energy in the process of switching on by energizing the exciting coil 130, and providing elastic force to separate the movable contact 230 from the stationary contact 310 when the exciting coil 130 is de-energized, so as to realize switching off. That is, after the exciting coil 130 is energized, the fixed armature 110 attracts the moving armature 210 to move and drives the moving contact 230 to move to a first position contacting the stationary contact 310, and after the exciting coil 130 is de-energized, the first elastic member 400 drives the moving contact 230 to move to a second position separated from the stationary contact 310.

The working principle of the contactor of the embodiment is that after the exciting coil 130 is electrified, the electromagnetic assembly 100 generates magnetic force, the fixed armature 110 attracts the movable armature 210 to move towards the fixed armature 110, the magnetic attraction force received by the movable armature 210 in the process is larger than the elastic force generated after the first elastic piece 400 is deformed, the first elastic piece 400 accumulates energy storage after elastic deformation due to the movement of the movable armature 210, the movable armature 210 drives the conductive beam 220 and the movable contact 230 on the conductive beam to move towards the fixed contact 310 until the movable contact 230 contacts with the fixed contact 310 and closes a circuit, at the moment, the state is shown in the diagram B of fig. 8, in the process, the movement stroke of the movable contact 230 is determined by the position of the fixed contact 310, the distance between the movable armature 210 and the fixed armature 110, the magnetic force continuously acts when the movable contact 230 contacts with the fixed contact 310, the extrusion force is formed between the movable contact 230 and the fixed contact 310, the virtual contact is ensured to be more stable, and the virtual contact phenomenon is reduced, when the exciting coil 130 is powered off, the fixed armature 110 loses the magnetic force with the movable armature 210, the elastic force of the first elastic piece 400 in the energy storage state drives the contact point assembly 200 to reset the movable contact 230 to be separated from the fixed contact 310, at the moment, and the state is reset by the elastic contact point 230 is realized by the elastic force of the elastic contact 400, and the elastic contact 400 in the diagram of the diagram shown in the diagram A of fig. 8.

In the above embodiment, the contact limit is not existed in the mutual movement process of the movable armature 210 and the fixed armature 110, the movement stroke of the movable contact 230 is not determined by the distance between the movable armature 210 and the fixed armature 110, wherein the movable armature 210 is still used for generating magnetic force with the fixed armature 110 to drive the movable contact 230 to move, but the movement stroke of the movable contact 230 is completely determined by the specific position of the fixed contact 310, that is, after the exciting coil 130 is energized, the fixed armature 110 attracts the movable armature 210 to move towards the fixed armature 110 until the movable contact 230 driven by the movable armature 210 abuts against the fixed contact 310, and at this time, mutual extrusion force is generated between the movable contact 230 and the fixed contact 310 due to the magnetic attraction of the fixed armature 110 to the movable armature 210, so that the contact connection is more stable.

The motion travel of the movable contact 230 is determined by the position of the fixed contact 310, but not by the distance between the movable armature 210 and the fixed armature 110, and after the movable contact 230 and the fixed contact 310 are closed, the movable contact 230 and the fixed contact 310 are in closer contact due to the extrusion force generated by the action of magnetic force, so that the contact resistance is reduced, and the occurrence of electric arcs is reduced. The design avoids the problems of poor contact, virtual connection, phase failure and the like caused by factors such as abrasion, ablation or deformation between the movable contact 230 and the fixed contact 310, improves the reliability and the service life of the contactor, and is suitable for various scenes such as motor control, power supply switching and the like in an industrial power system. When the contactor is a three-phase alternating current contactor, the improved structure can effectively avoid the synchronization deviation between the movable contact 230 and the fixed contact 310 and avoid the phase failure phenomenon caused by poor contact of partial contacts.

Preferably, the movable contact 230 may be made of silver alloy or other conductive material that is resistant to ablation to mitigate arcing losses to the contact surface. The movable contact 230 and the conductive beam 220 can be connected by riveting or welding, so that the firmness of the contact in the moving process is ensured.

Preferably, the first elastic member 400 is a coil spring, and the elastic force is precisely calculated, so that the spring can be quickly reset when power is off, and the magnetic attraction force is not significantly blocked when power is on. The material of the coil spring is preferably a high strength steel or other fatigue resistant material to improve the service life. The material selection of the stationary contact 310 prioritizes wear and corrosion resistance properties such as copper-based alloys or silver plated contacts.

In some embodiments, as shown in fig. 4 and 5, the movable contact assembly 200 includes two movable contacts 230, the two movable contacts 230 are disposed at two ends of the conductive beam 220 in a distributed manner, and the stationary contacts 310 in the stationary contact assembly 300 are also two and are disposed in a one-to-one correspondence with the movable contacts 230. The specific working principle is that two stationary contacts 310 in the stationary contact assembly 300 are separated from each other in space, when the contactor is in an open state, the movable contact 230 is also separated from the stationary contact 310, the conductive beam 220 does not participate in current conduction, and the circuit is kept open, when the contactor is closed, the electromagnetic assembly 100 drives the movable armature 210 to move, the movable contacts 230 at the two ends of the movable beam 220 are driven to approach the stationary contact 310, and as the movable contacts 230 are respectively contacted with the stationary contact 310, the conductive beam 220 is connected with the two movable contacts 230, so that the electrical connection of the two stationary contacts 310 is realized, the conductive beam 220 plays a bridging role in the process, so that the two contact points form a continuous conductive loop, and the circuit is closed. The conductive beam 220 mechanically connects the two movable contacts 230 as one body and ensures synchronous movement of the two movable contacts 230 by its rigidity. The conductive beam 220 is connected with the movable armature 210, and the conductive beam 220 integrally drives the two movable contacts 230 to synchronously move under the driving of the electromagnetic assembly 100, so that when the contactor is closed and opened, the two movable contacts 230 can be simultaneously contacted with or separated from the corresponding stationary contacts 310, and the phenomenon of poor contact or incomplete opening is avoided. Even if the spatial positions of the two stationary contacts 310 are slightly shifted, the corresponding deflection can be generated by the conductive beam 220, so that the two pairs of movable contacts 230 and the stationary contacts 310 are in close contact.

Preferably, the conductive beam 220 is integrally formed and made of a highly conductive material (e.g., copper or copper alloy), and may be further surface-tin-plated or silver-plated to reduce power loss and contact resistance while improving corrosion resistance. In the closed state, the conductive beam 220 performs the conduction of current between the two stationary contacts 310, and the high conductivity can meet the requirements of high current and high frequency operation of the contactor, so as to ensure the reliability and stability of the circuit.

The moving armature 210 of the moving contact assembly 200 may be arranged in the following manner.

The first way is that, as shown in fig. 4, the number of moving armatures 210 is set to one in each moving contact assembly 200, and is preferably disposed at a central position of the conductive beam 220, or designed to have the same length as the conductive beam 220, to ensure structural stability and reliability of movement. In this manner, the electromagnetic assembly 100 directly drives the single moving armature 210, and the moving armature 210 integrally drives the conductive beam 220 to move through the mechanical connection with the conductive beam 220, and the conductive beam 220 synchronously drives the moving contacts 230 at both ends thereof to displace. In the working process, after the electromagnetic assembly 100 is electrified, the generated electromagnetic force enables the single movable armature 210 to move along the appointed direction, the movable armature 210 drives the movable contacts 230 at two ends of the conductive beam 220 to approach the fixed contacts 310 through the mechanical connection effect of the movable armature 220, so that the contact and the electric connection between the two movable contacts 230 and the fixed contacts 310 are realized, when the electromagnetic assembly 100 is powered off, the movable armature 210 returns to the initial position under the action of the first elastic piece 400, and the conductive beam 220 drives the two movable contacts 230 to be separated from the fixed contacts 310, so that a circuit is disconnected.

The mode is simple in structure, because only one movable armature 210 is arranged, the design and the processing are relatively simple, the number of parts is small, the manufacturing cost is reduced, the movable armatures 210 are arranged in the middle or in an equal-size design in a concentrated mode, the deformation risk of the conductive beam 220 caused by uneven stress can be reduced, and long-term stable operation is ensured. This approach is applicable to contactor designs where the conductive beam 220 is relatively short and compact.

In the second way, as shown in fig. 5, a plurality of moving armatures 210 are provided in each moving contact assembly 200, and the moving armatures 210 are in one-to-one correspondence with the moving contacts 230. For example, when the movable contact 230 is provided in two and located at both ends of the conductive beam 220, the number of the movable armatures 210 is also provided in two, and the two movable armatures 210 are respectively provided at both ends of the conductive beam 220 and form a mechanical connection through the conductive beam 220.

In the working process, after the electromagnetic assembly 100 is electrified, the two movable armatures 210 move simultaneously under the action of electromagnetic force and integrally drive the conductive beam 220 and the two movable contacts 230 to move towards the fixed contact 310 through the mechanical connection of the conductive beam 220, as the two movable armatures 210 are respectively close to the two movable contacts 230, more targeted extrusion force can be applied to the respective contact areas, the contact pressure of each contact is improved, the movable contacts 230 and the fixed contacts 310 are ensured to be in close contact, so that more stable electric connection is realized, when the electromagnetic assembly 100 is powered off, the movable contact assembly 200 is restored to the initial position under the action of the first elastic piece 400, the movable contacts 230 are separated from the fixed contacts 310, and a circuit is disconnected. That is, the two moving armatures 210 are driven by the electromagnetic assembly 100 to drive the conductive beam 220 to move integrally, but since the two moving armatures 210 are respectively located at two ends of the conductive beam 220, they can provide more targeted extrusion force in respective contact areas, so as to ensure the contact reliability between the moving contact 230 and the fixed contact 310.

On the one hand, the two moving armatures 210 are distributed at two ends of the conductive beam 220, so as to provide more precise extrusion force in each area, and reduce the problems of too high contact resistance or poor contact caused by insufficient pressure in the contact point area. On the other hand, by driving the double-acting armature 210, the movable contacts 230 at two ends of the conductive beam 220 are subjected to more uniform acting force, so that uneven contact wear or performance degradation caused by uneven stress is effectively avoided. In a scenario requiring higher contact reliability or higher current capacity, the two moving armatures 210 can provide greater contact pressure, further improving contact performance, and for multi-pole, multi-contact contactors, the double acting armatures 210 can share the moving load of the conductive beam 220, improving the force uniformity and contact stability of the overall assembly.

In some embodiments, as shown in fig. 3, the contactor is an ac contactor, and the moving contact assembly 200 and the stationary contact assembly 300 are each provided with three groups to meet the on and off requirements of the three-phase circuit of the ac contactor. In this design, the movable contact assembly 200 and the stationary contact assembly 300 are respectively arranged in three groups, and respectively correspond to three phase lines (a phase, B phase and C phase) in a three-phase circuit, and the three groups of movable contact assemblies 200 are respectively used for controlling the on-off of the three phase lines. The structure of each set of moving contact assembly 200 and stationary contact assembly 300 is similar to the design of a single-phase contactor, but the three sets of assemblies are independently arranged and work in coordination to ensure the normal operation of the three-phase circuit.

The three groups of movable contact assemblies 200 are synchronously controlled through the movable armatures 210 or other driving mechanisms, namely, when the contactor is closed, the three groups of movable contact assemblies 200 are driven by electromagnetic force to move towards the corresponding stationary contact assemblies 300 respectively, the three groups of movable contact assemblies 200 are simultaneously contacted with the corresponding stationary contact assemblies 300 to realize the closing of a three-phase circuit, when the contactor is opened, the first elastic piece 400 restores the three groups of movable contact assemblies 200 to the initial position, and the three groups of movable contact assemblies 200 are simultaneously separated from the stationary contact assemblies 300 to realize the opening of the three-phase circuit.

When the moving armatures 210 in each moving contact assembly 200 are arranged to have two and are located at two ends of the conductive beam 220, the ac contactor in the above embodiment is shown as the figure, the three conductive beams 220 are respectively connected through the 3 first elastic members 400 to control the 6 moving contacts 230,6 to be mounted on the back side of the conductivity and to be arranged corresponding to the moving contacts 230, when the exciting coil 130 is energized, the lower fixed armature 110 and the upper 6 moving armatures 210 are attracted to each other due to the magnetic field, the elastic force of the first elastic members 400 is overcome to attract downward until the moving contacts 230 are contacted with the fixed contacts 310 and a certain pressure exists, and when the exciting coil 130 is de-energized, the first elastic members 400 rebound due to the elastic effect, so that the moving contacts 310 are separated.

According to the contactor provided in the foregoing embodiment of the present application, through structural improvement, a contact limit is not existed in the process of mutual movement of the movable armature 210 and the fixed armature 110, the movement stroke of the movable contact 230 is not determined by the distance between the movable armature 210 and the fixed armature 110, the movement stroke of the movable contact 230 is completely determined by the specific position of the fixed contact 310, and the problem that the conventional single-phase contactor cannot be contacted after the maximum distance between the movable contact 230 and the fixed contact 310 is increased or the problem that an arc is more easily generated is effectively solved. However, the above arrangement still has a new problem that the movable contact assembly 200 is reset by the first elastic member 400, which puts a high requirement on the reliability of the first elastic member 400, and when the performance of the first elastic member 400 is abnormal, a situation may occur in which, for example, when the exciting coil 130 is powered off, a certain first elastic member 400 fails due to aging, fatigue or other reasons without rebound, and the corresponding movable contact 230 and the stationary contact 310 are still adhered together, and the state is shown in fig. 8C, so that the movable contact 230 and the stationary contact 310 of a certain phase of the ac contactor are not completely opened, and the contactor fails, and when this occurs, the current transformer in the circuit detects that a phase of current still exists in the circuit.

Based on this, in the contactor of some embodiments, as shown in fig. 6, a first connection member 510 is provided on the fixed portion 500, a second connection member 240 is provided on the movable contact assembly 200, the first connection member 510 and the second connection member 240 may be coupled in a mating manner when the movable contact assembly 200 moves toward or away from the stationary contact 310, and the movable contact 230 may be limited to a third position in a state in which the first connection member 510 is coupled in a mating manner with the second connection member 240, and the contactor may include a driving assembly configured to drive the movable contact 230 to move such that the movable contact 230 is limited to the third position by the first connection member 510 and the second connection member 240, when the state is referred to as G in fig. 8. When the movable contact 230 is limited to the third position, the movable contact assembly 200 is in an open state with the stationary contact assembly 300.

The specific working logic may be that after the contactor executes the disconnection instruction, that is, after the exciting coil 130 is powered off, if the current transformer in the circuit detects that one phase or multiple phases of current exist in the circuit, a signal instruction is generated to the driving component through the controller, so that the driving component is controlled to act to drive all the movable contacts 230 to move, so that all the movable contacts 230 are limited in the third position by the first connecting piece 510 and the second connecting piece 240, the movable contacts 230 and the fixed contacts 310 which are not separated in time are forcedly separated, the problem that one phase or multiple phases of adhesion exists in the contactor is solved, the adhesion phase of the contactor can be cut off in time, and devices connected with the contactor are protected. Further working logic is that when the controller closes the contactor again, the movable contact point assembly 200 is limited by the first connecting piece 510 and the second connecting piece 240, so that the movable contact point 230 and the stationary contact point 310 of the contactor cannot be attracted, the contactor cannot be closed and connected, the contactor which has one or more adhesion risks is prevented from being closed again, working faults are generated, meanwhile, the current transformer in the circuit detects that the circuit has no current, at the moment, the damage of the contactor can be judged, and warning or prompt can be sent to the outside.

The above embodiment realizes forced separation of the adhesion contacts through the cooperation of the driving assembly, the first connecting member 510 and the second connecting member 240, avoids the problem of contact adhesion caused by failure of the first elastic member 400, and can prevent the contact adhesion contactor from being closed again, thereby avoiding larger circuit faults and equipment damage. The operation state of the contactor can be automatically detected through the auxiliary cooperation of the current transformer and the controller in the process, and the alarm prompt is timely given when the fault occurs, so that a further fault protection mechanism is provided, the reliability and the safety of the contactor are greatly improved, the automatic operation capability is enhanced, and the contactor is suitable for a complex industrial electrical control environment.

In the embodiment of the present application, in order to implement the limit function of the movable contact assembly 200 in a specific state, the first and second connection members 510 and 240 may be implemented in various structural forms, and the following are several alternative designs.

Optionally, the first connecting piece 510 and the second connecting piece 240 are hooks, the first connecting piece 510 is a hook with an opening facing away from the fixed armature 110, and the second connecting piece 240 is a hook with an opening facing toward the fixed armature 110. When the movable contact assembly 200 moves to the area near the third position, the engaging structures of the first connecting member 510 and the second connecting member 240 engage with each other, so as to limit the movable contact assembly 200 to the third position. The mechanical clamping connection is reliable, can effectively keep a limiting state after the movable contact 230 and the fixed contact 310 are forcedly separated, and is suitable for the scenes without additional energy support in various contactors.

Optionally, the first connector 510 and the second connector 240 are magnetic members. The magnetic member includes, but is not limited to, a magnet or electromagnet, and the first connector 510 is opposite to the second connector 240 in polarity so that it can be attracted to and connected to the second connector when it is in proximity. When the movable contact assembly 200 moves to the third position, the first and second connection members 510 and 240 limit the movable contact assembly 200 to the third position by magnetic attraction. The contactor is free from mechanical clamping, avoids functional failure caused by mechanical abrasion, can realize higher reliability and stability, is particularly suitable for contactors with high-frequency actions, and can realize release of a limit state by controlling on-off power if an electromagnet is used. The method is suitable for scenes with high requirements on the reliability and flexibility of the limiting device, such as high-end industrial equipment or complex control systems.

Optionally, the first connecting member 510 and the second connecting member 240 are both snap-fit, and a reliable mechanical connection can be achieved through snap-fit, and when the movable contact assembly 200 moves to the vicinity of the third position, the first connecting member 510 and the second connecting member 240 are snapped together, so as to fix the movable contact assembly 200 in the disconnected state. The high-voltage high-power contact is firm in connection, stable in long-time use, high in vibration resistance and durability compared with a clamping hook structure, and suitable for being used in vibration or impact environments, such as a high-voltage or high-power contact.

The three optional designs can be flexibly selected according to the specific application scene of the contactor, and the designs provide various implementation modes for limiting the movable contact assembly 200, so that the applicability and reliability of the contactor are further improved.

On the basis of the foregoing embodiment, as shown in fig. 6 and 7, the electromagnetic assembly 100 further includes a bracket 140 and a locking mechanism, the driving assembly includes a second elastic member 600, the fixed armature 110 is connected to the bracket 140 in a locking state by the locking mechanism, the second elastic member 600 is in an energy storage state and has a tendency to move the fixed armature 110 toward the movable contact assembly 200, and the fixed armature 110 is unlocked from the bracket 140 when the locking mechanism is in an unlocking state, and the fixed armature 110 moves toward the movable contact assembly 200 under the action of the second elastic member 600 and pushes the movable contact 230 to at least the third position, and the second position is located between the first position and the third position. The stationary contact assembly 300 is fixedly connected with the stationary armature 110, and when the locking mechanism is in an unlocked state, the stationary armature 110 pushes the movable contact 230 to move through the stationary contact assembly 300 under the action of the second elastic member 600, so that more direct power transmission and movement control of the movable contact 230 are realized.

In a normal operation mode, the locking mechanism is in a locking state, the fixed armature 110 is locked and connected to the bracket 140 through the locking mechanism, the second elastic member 600 is in an energy storage state and has a tendency to enable the fixed armature 110 to move towards the movable contact assembly 200, and since the armature is locked and connected to the bracket 140 through the locking mechanism, the movable armature 210 cannot be separated from the bracket 140 due to the elastic force of the second elastic member 600, and the closing and opening process between the movable contact 230 and the fixed contact 310 is completed through the on-off of the exciting coil 130, and the state is shown by referring to fig. 8 a and B.

When the contactor has the problem of contact adhesion as shown in the graph C in fig. 8, that is, after the exciting coil 130 is powered off and the contactor executes a disconnection instruction, if the current transformer in the circuit detects that one phase or multiple phases of current exist in the circuit, a signal instruction is generated to the locking mechanism through the controller, the locking mechanism has a locking state to act to an unlocking state as shown in the graph D-G in fig. 8, the fixed armature 110 drives the fixed armature 110 to move towards the movable contact assembly 200 under the action of the second elastic member 600, after the energy storage of the second elastic member 600 is released, the second elastic member 600 is finally in a stable state as shown in the graph G in fig. 8, the second elastic member 600 pushes the fixed armature 110, the fixed contact assembly 300 and the movable contact assembly 200 to move in a moving stage after the energy storage of the second elastic member 600 is suddenly released, and further overcomes the elastic force of the first elastic member 400 when pushing the movable contact assembly 200, the movable contact 230 is pushed to pass through the position of the second elastic member 600 in the final stable state and the second position shown in fig. 8 due to the strong inertia effect in the movement process after the abrupt release, and the movable contact 230 can be pushed to move at least to a third position further, so that all the movable contacts 230 are limited in the third position by the first connecting member 510 and the second connecting member 240, the state at this time is shown in fig. 8 as F, at this time, the second elastic member 600 is restored to the natural state under the reverse force of the second elastic member 600, the stationary contact assembly 300 is pushed back towards the direction of the bracket 140 by the fixed armature 110 to reach the state shown in fig. 8 as G, so that the stationary contact 310 is forcedly separated from the movable contact 230 limited in the third position, the problem that one phase or multiple phases of the contactor are adhered is solved, the adhered phase of the contactor can be cut off in time, and devices connected with the contactor are protected. In this embodiment, the driving assembly includes at least a second elastic member 600, an unlocking mechanism, and a fixed armature 110.

After the exciting coil 130 is powered off, if it is found that current still flows through the adhesion phase, the controller sends a signal to unlock the locking mechanism, trigger the second elastic member 600 to release, and force the contacts to be separated. The design avoids the problem that the conventional contactor is difficult to separate when the movable contact 230 is stuck, and can quickly restore the disconnection state of the contactor. When the controller tries to reclose the contactor, the movable contact 230 cannot move to the stationary contact 310 due to being limited at the third position, and the contactor cannot be closed, so that the adhesion fault is avoided. At this time, the current transformer in the circuit detects that no current flows, and can judge that the contactor is damaged and send an alarm or prompt message to the outside. The release of the second elastic member 600 not only overcomes the reverse elastic force of the first elastic member 400, but also allows the movable contact point 230 to move to the third position through the movement inertia, and the stationary contact point 310 is retracted due to the restoration of the second elastic member 600 to the natural state, so as to ensure the disconnection of the contact point, so that the movable contact point assembly 200 is completely separated from the stationary contact point 310, thereby completely cutting off the blocking phase.

The present embodiment achieves an efficient solution to the problem of contact sticking by introducing the locking mechanism and the second elastic member 600 into the contactor, and combining the detection and control capabilities of the controller. The design effectively improves the reliability and the safety of the contactor, and is particularly suitable for equipment with high requirements on contact action, such as a three-phase alternating current contactor.

Stationary contact assembly 300 is preferably mechanically coupled to stationary armature 110 (e.g., by screws, welding, or other fastening means) such that, when stationary armature 110 moves under the influence of second spring 600, the movement of movable contact assembly 200 is urged by the transfer action of stationary contact assembly 300 until movable contact 230 reaches the third position, and then stationary contact assembly 300 is retracted with stationary armature 110 to achieve complete separation of movable contact 230 from stationary contact 310.

The stationary contact assembly 300 is directly fixedly connected with the stationary armature 110, the motion of the stationary armature 110 directly pushes the movable contact assembly 200 through the stationary contact assembly 300, an additional motion transmission mechanism is not needed, the structure is simpler, loss or error in motion transmission is avoided, and the stationary contact assembly 300 is used as an intermediate medium between the stationary armature 110 and the movable contact assembly 200, for example, so that when the second elastic member 600 is released, the movable contact 230 can be accurately pushed to the third position by the stationary contact assembly 300.

It should be emphasized that in the above embodiment, after the second elastic member 600 is restored to the stable state when the locking mechanism is in the unlocked state, the stationary contact 310 is out of contact with the movable contact 230 in the third position. By releasing the second elastic member 600, the movable contact assembly 200 is ensured to be pushed to the third position, so that the movable contact 230 and the stationary contact 310 are completely separated, circuit faults caused by adhesion are avoided, the second elastic member 600 provides enough power in the releasing process, and the elasticity of the first elastic member 400 can be effectively overcome by combining with the inertia effect, so that the movement of the movable contact assembly 200 is ensured to be in place. After the second elastic member 600 is restored to the stable state, the movable contact assembly 200 is maintained at the third position, and the movable contact 230 and the stationary contact 310 are completely separated from contact, so that forced disconnection is realized, and the hidden danger of contact adhesion is fundamentally solved.

In the contactor of the present application, in order to realize automatic control, the contactor includes a current transformer configured to detect whether or not there is a current between the movable contact 230 and the stationary contact 310 when the contactor is in a closed state, and a controller configured to control a state of the locking mechanism according to a detection result of the current transformer.

The current transformer is configured as a monitoring assembly for detecting whether current is still present between the movable contact 230 and the stationary contact 310 in the closed state of the contactor (i.e., when the field coil 130 is de-energized). When the contactor is normally opened, the movable contact 230 is separated from the stationary contact 310, and the current transformer should detect no current, and if the movable contact 230 is not separated from the stationary contact 310 due to the adhesion problem, the current transformer may detect abnormal current.

And the controller analyzes the running state of the contactor, particularly the connection condition between the contacts in real time according to the detection result of the current transformer. When the adhesion problem is detected, the controller sends a signal instruction to the locking mechanism to trigger the locking mechanism to switch from the locking state to the unlocking state. The triggering of the unlocking state further activates the forced separation function of the contactor, and separates the adhered movable contact 230 from the stationary contact 310 by the action of the driving assembly (including the second elastic member 600), the first connection member 510, the second connection member 240, and the like.

The current transformer can rapidly detect abnormal current caused by contact adhesion, and the controller realizes automatic processing based on detection results without manual intervention. Once the adhesion problem occurs, the contactor can automatically start a fault processing mechanism to forcedly separate the movable contact 310, so that a circuit and connecting equipment are effectively protected, and potential safety hazards such as arc and overload caused by contact adhesion are avoided. Through the cooperative work of the current transformer and the controller, the running state of the contactor can be automatically monitored and controlled in the whole process, and high-efficiency and accurate fault response is realized.

As an alternative embodiment, as shown in fig. 7 and 8, the locking mechanism includes a driving member, an i-key 151, a first key groove 152 and a second key groove 153, where the first key groove 152 is a T-shaped groove formed on the bracket 140, the second key groove 153 is a T-shaped groove formed on the fixed armature 110, and the first key groove 152 and the second key groove 153 are symmetrically arranged, and when the fixed armature 110 and the bracket 140 are in a mutually abutting state, the first key groove 152 and the second key groove 153 are spliced to form an i-shaped groove, and the i-shaped key 151 can be correspondingly clamped into the i-shaped groove to complete locking of the bracket 140 and the fixed armature 110. The driving member is preferably a micro motor for driving the spool 151 in its extending direction and may be engaged into or disengaged from the spool during movement of the spool 151 in its extending direction.

The locking and unlocking of the fixed armature 110 and the bracket 140 can be realized through the specific locking mechanism, so that the reliable operation of the contactor is ensured, and meanwhile, the precision and the reliability of the whole structure are improved. The driving member is used for controlling the motion of the spool 151, preferably a micro motor, and can precisely drive the spool 151 to move along the extending direction thereof, so as to realize locking or unlocking motion. The key 151 is a mechanical locking member having an i-shape and is inserted into or removed from the i-shaped groove to lock or unlock the bracket 140 and the fixed armature 110. The first key groove 152 is a T-shaped groove formed on the bracket 140, and is used for being engaged with a part of the i-shaped key 151. The second key groove 153 is a T-shaped groove formed in the fixed armature 110, is symmetrically arranged with respect to the first key groove 152, and is configured to form an i-shaped groove with respect to the first key groove 152 as shown in fig. 8D. When the fixed armature 110 and the bracket 140 are in a mutually abutting state, the first key groove 152 and the second key groove 153 are aligned and spliced to form a complete I-shaped groove, and the I-shaped key 151 can be clamped into the I-shaped groove to lock the bracket 140 and the fixed armature 110, so that the fixed armature 110 and the bracket 140 form stable connection.

In the normal operation mode, as shown in fig. 8 a and B, the i-shaped key 151 is engaged into the i-shaped groove, and the i-shaped key 151 completes locking the fixed armature 110 and the bracket 140. The fixed armature 110 is fixedly coupled to the bracket 140 without being moved by the elastic force of the second elastic member 600. The movable contact assembly 200 can complete the closing and opening actions between the movable contact 230 and the stationary contact 310 by the on-off of the exciting coil 130. When the contactor is abnormal (for example, the movable contact 230 is adhered to the stationary contact 310 in fig. 8C), the controller receives the detection signal of the current transformer, and then sends a control command to the driving member, the driving member acts to drive the i-shaped key 151 to release from the i-shaped groove along the extending direction, and the state is as shown in fig. 8D, so that the unlocking between the fixed armature 110 and the bracket 140 is completed. After unlocking, as shown in fig. 8E-G, the fixed armature 110 pushes the movable contact assembly 200 to move under the action of the second elastic member 600, so that the movable contact 230 and the stationary contact 310 are forcibly separated, and the contact adhesion problem is solved. After the unlocking action is completed, if the normal operation of the contactor needs to be restored after the fault problem is removed in the later period, the fixed armature 110 can be reset to a state of being in contact with the bracket 140 manually or through other mechanisms, the first key groove 152 and the second key groove 153 are aligned and spliced to form a complete I-shaped groove, the driving piece can drive the I-shaped key 151 to move reversely along the extending direction of the I-shaped key 151 again, so that the I-shaped key 151 is clamped into the I-shaped groove again, and the locking state of the fixed armature 110 and the bracket 140 is restored.

Through the design, the locking mechanism can accurately control the connection state of the fixed armature 110 and the bracket 140 of the contactor, so that an efficient and reliable technical scheme is provided for solving the problem of contact adhesion, and meanwhile, the long-term stable operation of the contactor is ensured.

In this specification, some embodiments are described in a progressive or parallel manner, and each embodiment is mainly described by a difference from other embodiments, and the same similar parts between the embodiments are referred to each other.

The foregoing is merely exemplary of embodiments of the present application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A contactor, comprising:

A movable contact assembly, comprising a movable armature, a conductive beam and a movable contact, wherein the movable armature is connected to a side of the conductive beam facing away from the fixed armature, and the movable contact is connected to a side of the conductive beam facing the fixed armature;

A static contact assembly, comprising a static contact disposed between the movable contact assembly and the fixed armature and disposed directly opposite to the movable contact;

A first elastic member, disposed between the moving contact assembly and the fixed portion;

When the excitation coil is energized, the fixed armature attracts the movable armature to move and drives the movable contact to a first position in contact with the static contact. When the excitation coil is deenergized, the first elastic member drives the movable contact to a second position away from the static contact.

2. The contactor according to claim 1 is characterized in that the moving contact assembly includes two moving contacts, the two moving contacts are distributed at both ends of the conductive beam, and the static contacts in the static contact assembly are arranged in a one-to-one correspondence with the moving contacts.

3 . The contactor according to claim 1 , wherein the movable armature and the movable contact are arranged in a one-to-one correspondence.

4 . The contactor according to claim 1 , wherein the contactor is an AC contactor, and the moving contact assembly and the static contact assembly are each provided with three groups.

5. The contactor according to any one of claims 1 to 4, characterized in that:

The fixing portion is provided with a first connecting member, and the moving contact assembly is provided with a second connecting member. When the moving contact assembly moves toward or away from the stationary contact, the first connecting member and the second connecting member can be matched and connected. When the first connecting member and the second connecting member are matched and connected, the moving contact is limited to a third position.

The contactor further includes a driving component configured to drive the movable contact to move so that the movable contact is restricted to the third position by the first connecting member and the second connecting member.

6. The contactor according to claim 5, characterized in that the electromagnetic assembly further comprises a bracket and a locking mechanism, and the driving assembly comprises a second elastic member;

When the locking mechanism is in a locked state, the fixed armature is locked and connected to the bracket through the locking mechanism, and the second elastic member is in an energy storage state and has a tendency to make the fixed armature move toward the moving contact assembly;

When the locking mechanism is in an unlocked state, the fixed armature and the bracket are unlocked, and the fixed armature moves toward the moving contact assembly under the action of the second elastic member and pushes the moving contact to at least the third position, and the second position is located between the first position and the third position.

7. The contactor according to claim 6 is characterized in that the static contact assembly is fixedly connected to the fixed armature, and when the locking mechanism is in an unlocked state, the fixed armature pushes the movable contact to move through the static contact assembly under the action of the second elastic member.

8 . The contactor according to claim 7 , wherein when the locking mechanism is in the unlocked state, after the second elastic member returns to a stable state, the static contact is out of contact with the moving contact in the third position.

9. The contactor according to claim 6, characterized in that:

The first connecting member and the second connecting member are both hooks, the first connecting member is a hook with an opening facing away from the fixed armature, and the second connecting member is a hook with an opening facing the fixed armature; or

The first connecting member and the second connecting member are both magnetic members; or

The first connecting member and the second connecting member are both buckles.

10. The contactor according to any one of claims 6 to 9, further comprising:

a current transformer, configured to detect whether there is current between the moving contact and the stationary contact when the contactor is in a closed state;

A controller is configured to control the state of the locking mechanism according to the detection result of the current transformer.