CN212257298U

CN212257298U - Multi-contact arc-extinguishing relay

Info

Publication number: CN212257298U
Application number: CN202021240331.XU
Authority: CN
Inventors: 廖为龙
Original assignee: Beijing Xinyu Ganglian Technology Co ltd
Current assignee: Beijing Xinyu Ganglian Technology Co ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2020-12-29
Anticipated expiration: 2030-06-29

Abstract

The application relates to the field of relays, and particularly discloses a multi-contact arc-extinguishing relay which comprises a control circuit and a working circuit, wherein the control circuit comprises an electromagnet, the working circuit comprises a static end and a movable end, the electromagnet acts according to the current change in an input control circuit to control the contact/disconnection of the static end and the movable end of the working circuit, and at least two groups of contacts are arranged on the static end and the movable end; the distance between one group of contacts is larger than that between the other group of contacts, when the current of the control circuit changes, each group of contacts is contacted/disconnected in sequence, and the melting point of the later disconnected contacts is higher than that of the first disconnected contacts. This application controls the position that the electric arc produced through set up multiunit contact/disconnection asynchronous contact in the relay, makes the electric arc controllable and reduces the influence of electric arc, provides the relay that the security is higher, life is longer.

Description

Multi-contact arc-extinguishing relay

Technical Field

The application relates to the field of relays, in particular to a multi-contact arc-extinguishing relay.

Background

The electromagnetic relay is used in circuit to control the automatic switch with relatively high current and relatively high voltage with relatively low current and relatively low voltage, and has the functions of automatic regulation, safety protection, switching circuit, etc. the electromagnetic relay controls the armature to act by means of electromagnetic effect to control the open and close state of the circuit comprising movable contact and static contact. When the movable contact and the fixed contact in the conductive contact are disconnected, electric arcs are easy to generate, and the high-temperature electric arcs can melt or oxidize the contacts, so that the conductive performance of the contacts is reduced, and the service life and the effectiveness of the electromagnetic relay are influenced. Due to the limitation of the internal space and the consideration of the cost, the conventional relay is rarely provided with an arc extinguishing device, and materials with higher melting points are often used as contacts to overcome the influence generated by electric arcs, but the conductivity of the materials is also poorer.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the electric arc that produces influences contact conductivity in the relay that prior art exists, this application provides one kind through the improvement to the contact part and can reach better electric conductive property, can the arc extinguishing or reduce the multicontact arc extinguishing relay of electric arc to the influence of contact simultaneously.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

a multi-contact arc-extinguishing relay comprises a control circuit and a working circuit, wherein the control circuit comprises an electromagnet, the working circuit comprises a static end and a movable end, the electromagnet acts according to the current change input into the control circuit so as to control the static end and the movable end of the working circuit to be in contact with/disconnected from each other, and at least two groups of contacts are arranged on the static end and the movable end; the distance between one group of contacts is larger than that between the other group of contacts, when the current of the control circuit changes, each group of contacts is contacted/disconnected in sequence, and the melting point of the later disconnected contacts is higher than that of the first disconnected contacts.

This scheme is through setting up at least two sets of contacts in the relay and playing the effect of arc extinguishing or reducing the influence of electric arc, and is concrete, and the interval of every group contact is different, and the contact that the interval is different makes the movable end when to the direction motion that touches/break off with the stationary end, and every group contact is not touching/break off simultaneously, can effectively reduce the electric arc to the influence of electric conductivity such as the conductivity and the resistivity of contact. For example, when the contacts are contacted, the contact with the closer distance is contacted first, the arc is more easily generated between the contacts contacted by the first group, the contact with the farther distance is also contacted with the continuous movement of the movable end, and the arc is not easily generated between the contacts because the static end and the movable end are already conducted when the contacts are contacted. In the same way, when the contacts are disconnected, on the contrary, when the movable end starts to move, the contacts which are originally far away from each other are disconnected first, and at the moment, because other contacts still keep a contact conduction state, electric arcs are not easy to generate, and the electric arcs are easier to occur between the last group of disconnected contacts. In summary, the contact points with the closer distance can not only contact before other contact points, but also be disconnected after other contact points, and the electric arc can also be mainly generated in the group of contact points, so that the contact points which are disconnected after the contact points are made of materials with higher melting points, and the influence of the high-temperature electric arc on the properties of the contact points can be reduced.

It is worth to be noted that the group with the closer contact distance and the higher melting point is the auxiliary contact of the relay, and the group with the farthest contact distance is the main contact, wherein, the function of the auxiliary contact is to bear the electric arc when the circuit is connected or disconnected, and avoid the electric arc to occur in the main contact, the auxiliary contact needs to ensure that the electric arc still keeps the conductivity even if the electric arc affects the contact surface. The main contact is used as a main conductive element in the relay to connect a current path between the electric equipment and a power supply, and the group of contact assemblies only need to ensure higher conductivity and lower resistivity.

Furthermore, the control circuit also comprises a yoke iron fixedly connected with the electromagnet and an armature iron movably connected with the yoke iron; the movable end comprises conductive elastic pieces corresponding to the number of the contacts, the conductive elastic pieces are fixedly connected with the armature, and the armature is controlled by the electromagnet to act so that the contacts of the movable end and the static end are contacted/disconnected.

The scheme directly fixes the conductive elastic sheet provided with the contact on the armature, so that when the electromagnet causes the armature to move, the electromagnet directly causes the movement of the movable end. The movable end is often arranged on the moving path of the armature, and the pressure exerted by the armature pushes the movable end to a position contacting with the static end. Compared with the prior art, the scheme uses another structure, the action of the armature is converted into the contact/disconnection action of the static end and the movable end in the contact assembly, and the basic function of the relay is realized.

Furthermore, the control circuit also comprises a reed, two ends of which are respectively fixedly connected with the yoke and the armature. When the reed makes the electromagnet no longer adsorb the armature, the reed provides the armature with elastic force moving away from the electromagnet.

Further, the static end comprises a first static contact and a second static contact, and the movable end comprises a first movable contact and a second movable contact which respectively correspond to the first static contact and the second static contact; the distance between the first fixed contact and the first movable contact is larger than the distance between the second fixed contact and the second movable contact.

Further, the first fixed contact and the first movable contact adopt silver or silver alloy as contact materials, and the second fixed contact and the second movable contact adopt tungsten steel as contact materials. The first fixed contact and the first movable contact are main contacts in the application, the second fixed contact and the second movable contact are auxiliary contacts in the application and are connected with the main contacts in parallel, and when the first fixed contact is separated from the first movable contact, the second fixed contact and the second movable contact are kept in contact, so that electric arc is prevented from being generated between the first fixed contact and the first movable contact. Therefore, the first fixed contact and the first movable contact are preferably made of materials with high conductivity and small resistance, such as silver, so that the better conductivity and safety of the relay are ensured, and the second fixed contact and the second movable contact are preferably made of materials with higher melting points, such as tungsten steel alloy, so that the materials are not easy to melt or oxidize under the action of electric arc, the conductive action of the materials is kept for a longer time, and the electric arc generated between the first fixed contact and the first movable contact when the relay cuts off the circuit is avoided. It is worth noting that when selecting a contact material, various properties cannot be considered, a material with high conductivity tends to have a lower melting point, while a material with a higher melting point tends to have high resistivity and low conductivity. Therefore, the main contact is preferably a material with high conductivity, the melting point of the main contact is relatively low, the resistivity of silver is extremely low, and the main contact does not easily generate heat when conducting electricity, and is the most preferable contact material. Tungsten steel is the most preferable material for the secondary contact because of its stable properties, extremely high melting point and certain conductivity.

Furthermore, the pin assembly is used for connecting the control circuit, the working circuit and an external circuit, and can be directly plugged into a socket matched with the pin assembly to realize electric connection and can be connected with the external circuit through the plug assembly. The scheme further optimizes the whole structure of the relay, and the internal system of the relay is connected with an external circuit through the pin assembly so as to complete the functions of the relay. The relay in this application is applicable to the automotive filed more as automobile relay, consequently, makes the installation and the maintenance replacement of relay more convenient through the direct mode of pegging graft of pin subassembly. When the automobile lacks a socket directly matched with the pin component, the plug-in component can be arranged to be matched with the pin component so as to be conveniently installed in the circuit of the automobile.

Furthermore, the pin assembly comprises a first pin in conductive connection with the first fixed contact and the second fixed contact, and a second pin in conductive connection with the first movable contact and the second movable contact; and the third pin and the fourth pin are electrically connected with the electromagnet to form a current loop inside the electromagnet. The third pin and the fourth pin are connected with a power supply to supply power to the electromagnet, so that the relay can play a control role. The first pin and the second pin are connected in series in a circuit which needs to be controlled by the relay, so that the relay plays a role of a switch, wherein two groups of mutually corresponding fixed contacts and moving contacts are in a parallel connection relation.

Furthermore, the plug-in assembly comprises a plug connector and a conducting strip, the pin is plugged in the plug connector and is in contact with the conducting strip to conduct electricity, and the conducting strip is in conductive connection with the plug. The scheme further limits the specific structure of the plug-in component, the plug-in relation between the plug-in component and the pins is completed by the plug-in connector, and the plug-in connector ensures the stability of plug-in connection between the plug-in connector and the pins. The plug connector has no conductivity, and the conducting strip is independently arranged to complete the conductive connection between the pin and the external circuit.

It should be noted that, if the plug is a structure in which the pins are completely enclosed after being inserted, the conductive plate is also disposed inside the plug to ensure contact with the pins, and interference fit is preferably selected between the plug and the pins. If the plug is in a semi-enclosed structure, the conducting strip can be arranged in the plug to be matched with the pin, so that one surface of the pin is exposed. The structure can also be fully enclosed by the same structure of conducting strip and plug, in this kind of structure, be difficult to guarantee the stability of being connected between pin and plug and the conducting strip simultaneously, preferably additionally set up the connecting piece and guarantee that the connection of three is stable.

Furthermore, the plug-in assembly also comprises a locking piece which can detachably and fixedly connect the pin assembly with the plug-in connector and the conducting strip. Set up the retaining member in this scheme, further guaranteed the stability of being connected between pin subassembly and bayonet joint and the conducting strip.

The beneficial effect of this application is: the relay is provided with a plurality of groups of contacts which are not in synchronous contact/disconnection to control the position of the generated electric arc, so that the electric arc is controllable, the influence of the electric arc is reduced, and the relay with higher safety and longer service life is provided.

Drawings

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

FIG. 1 is a schematic view of the overall construction of a mating plug of the present application;

FIG. 2 is an enlarged partial schematic view at A of FIG. 1;

FIG. 3 is a schematic structural diagram of the present application;

FIG. 4 is a schematic diagram of the internal structure of the present application;

FIG. 5 is a schematic view of the internal structure from another perspective of the present application;

FIG. 6 is a disassembled schematic view of the internal components of the present application;

FIG. 7 is an enlarged partial schematic view at B of FIG. 6;

FIG. 8 is a front view of the internal structure of the present application;

FIG. 9 is a top view of the internal structure of the present application;

FIG. 10 is a schematic structural diagram of example 7 of the present application;

in the figure: 1-a housing; 2-controlled circuit connecting plug; 3-electromagnet power supply plug; 4-a first pin; 5-a third pin; 6-a second pin; 7-a fourth pin; 8-a yoke iron; 9-an armature; 10-a first conductive dome; 11-a second conductive elastic sheet; 12-a reed; 13-an electromagnet; 14-a first stationary contact; 15-a first moving contact; 16-a second stationary contact; 17-a second movable contact; 18-a plug-in connector; 19-a conductive sheet; 20-a retaining member; 21-braided wire.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

3-9, the control circuit comprises an electromagnet 13, the working circuit comprises a static end and a movable end, the electromagnet 13 acts according to the current change input into the control circuit to control the static end and the movable end of the working circuit to contact/break, and at least two sets of contacts are arranged on the static end and the movable end; the distance between one group of contacts is larger than that between the other group of contacts, when the current of the control circuit changes, each group of contacts is contacted/disconnected in sequence, and the melting point of the later disconnected contacts is higher than that of the first disconnected contacts.

The working principle is as follows:

the relay is externally provided with a shell 1, and the relay mainly comprises a control circuit and a working circuit, wherein low-voltage current passes through the control circuit, high-voltage current passes through the working circuit, and the on-off of the current in the working circuit is controlled by the action of the control circuit. The electromagnetic relay uses the electromagnet 13 as a main component in the control circuit, and uses the electromagnetic induction phenomenon to enable the electrified coil to magnetize the iron core in the coil, whether the current is introduced into the coil determines whether the iron core generates a magnetic field, and the magnetic field change of the iron core controls the action of the movable end. Specifically, when the electromagnet 13 is energized with current, the movable end is close to the stationary end and is in contact with the stationary end to conduct electricity under the action of the magnetic field, and when no current flows through the electromagnet 13, the iron core does not generate a magnetic field any more, so that the movable end and the stationary end are tripped and are not in contact with each other, and the effect of controlling the on-off of large current by using the on-off of small current is achieved.

In addition, the relay of the application comprises at least two groups of contacts, the movable end moves towards the direction close to the static end under the action of the magnetic field of the iron core, however, because the distances between the contacts in the static end and the movable end are different, when the contacts are contacted, the contacts with the closer distances are contacted first, electric arcs are more easily generated among the contacts contacted by the first group, along with the continuous movement of the movable end, the contacts with the farther distances are also contacted, and because when the contacts are contacted, the static end and the movable end are already conducted, the electric arcs are not easily generated among the contacts. In the same way, when the contacts are disconnected, on the contrary, when the movable end starts to move, the contacts which are originally far away from each other are disconnected first, and at the moment, because other contacts still keep a contact conduction state, electric arcs are not easy to generate, and the electric arcs are easier to occur between the last group of disconnected contacts. In summary, the contact points with the closer distance can not only contact before other contact points, but also be disconnected after other contact points, and the electric arc can also be mainly generated in the group of contact points, so that the contact points which are disconnected after the contact points are made of materials with higher melting points, and the influence of the high-temperature electric arc on the properties of the contact points can be reduced.

It is worth mentioning that in the present application, a plurality of sets of contacts connected in parallel are provided, so that the influence of the arc is concentrated into one set of contacts, and the other contacts are not influenced by the arc. Therefore, among the plurality of sets of contacts, one set serves to concentrate the arc and minimize the influence of the arc on the relay performance, and the other set serves to mainly conduct electricity, the former is preferably set as a contact member having a higher melting point to prevent the arc from melting the contact member, and the latter is preferably set as a contact member having high electrical conductivity and small electrical resistivity and good electrical conductivity.

Example 2:

in this embodiment, a control circuit is further optimized and limited based on embodiment 1.

As shown in fig. 4-6, the control circuit further includes a yoke 8 fixedly connected to the electromagnet 13 and an armature 9 movably connected to the yoke 8; the movable end comprises conductive elastic pieces corresponding to the number of the contacts, the conductive elastic pieces are fixedly connected with the armature 9, and the armature 9 is controlled by the electromagnet 13 to act so that the contacts of the movable end and the static end are contacted/disconnected. The control circuit also comprises a reed 12, two ends of which are respectively fixedly connected with the yoke iron 8 and the armature iron 9.

As shown in fig. 4, the yoke 8 is L-shaped, one end of the iron core in the electromagnet 13 is connected with one side of the yoke 8, the other side of the yoke 8 is connected with the armature 9 to form a movable connection between the armature 9 and the yoke 8, and the armature 9 is close to the other end of the iron core. When current passes through the electromagnet 13, the iron core has magnetism and adsorbs the armature 9, and at the moment, the contact of the movable end is in one-to-one corresponding contact with the contact of the static end for conducting electricity. When no current flows in the electromagnet 13 to enable the iron core to lose magnetism, the electromagnet 13 can not adsorb the armature 9 any more, and under the action of tension provided by elastic deformation of the reed 12, the armature 9 moves around the connection part between the armature 9 and the yoke 8 in the direction away from the iron core, so that the contact on the conductive elastic sheet is disconnected with the contact on the static end. As shown in fig. 4-6, two sets of contacts are provided, and two independent first conductive elastic pieces 10 and second conductive elastic pieces 11 are fixed on the armature 9.

It should be noted that the two independent conductive elastic pieces are arranged to match the different movement strokes of the two movable contacts during the synchronous movement, and the two conductive elastic pieces independently provide elastic force to make the contacts with different distances contact each other under the condition that the movement stroke of the armature 9 is fixed. Specifically, assuming that the contact point on the first conductive elastic piece 10 is far from the contact point on the stationary end, when the armature 9 moves toward the iron core, the contact point on the second conductive elastic piece 11 contacts the contact point on the stationary end to conduct electricity before the armature 9 moves to the end position. Then, the armature 9 continues to move, and the second conductive elastic piece 11 starts to deform, so that the contact points which are already contacted are not disconnected while the armature 9 does not influence the movement until the armature 9 moves to the end position, and the contact points on the second conductive elastic piece 11 are contacted with the corresponding contact points to conduct electricity. When the armature 9 moves in a direction away from the iron core, the contact on the first conductive elastic sheet 10 is firstly disconnected with the contact on the static end, at this time, the second conductive elastic sheet 11 gradually starts to recover from the deformation state, knowing that the armature 9 moves to a certain position, the second conductive elastic sheet 11 completely recovers, and the contact on the second conductive elastic sheet 11 is also disconnected with the corresponding contact.

Furthermore, the function of the first conductive spring 10 and the second conductive spring 11 is to adapt the movement of the contacts to the movement of the armature 9, providing the necessary elastic force for the contacts, while the function of the spring 12 is to provide the elastic force for the armature 9 to disengage from the electromagnet 13. Wherein, a part of the conductive spring and the reed 12 are fixed on the armature 9. In order to make the structure simpler, the conductive elastic piece and the spring 12 can be set to be an integrated structure, forming an overall approximate L-shaped structure, one end of which is fixedly connected to the yoke 8 and the other end of which is fixedly connected to the armature 9, wherein the tail end of the part connected with the armature 9 is forked to form two conductive elastic pieces which can elastically deform relative to the armature 9.

Example 3:

in this embodiment, a contact terminal is further optimized and defined based on embodiment 2.

As shown in fig. 7-9, the stationary end includes a first stationary contact 14 and a second stationary contact 16, and the movable end includes a first movable contact 15 and a second movable contact 17 corresponding thereto, respectively; the distance between the first fixed contact 14 and the first movable contact 15 is larger than the distance between the second fixed contact 16 and the second movable contact 17. The first fixed contact 14 and the first movable contact 15 adopt silver or silver alloy as contact materials, and the second fixed contact 16 and the second movable contact 17 adopt tungsten steel as contact materials.

In the present embodiment, two sets of contacts are provided in the relay, in the present embodiment, the distance between the first fixed contact 14 and the first movable contact 15 is large, when the movable end moves, the second movable contact 17 first contacts with the second fixed contact 16, then the first movable contact 15 contacts with the first fixed contact 14, and when the contacts are disconnected, the opposite is true, the first movable contact 15 is disconnected from the first fixed contact 14, then the second movable contact 17 is disconnected from the second fixed contact 16. The first stationary contact 14 and the first movable contact 15 function as a main contact, and a material having a good electrical conductivity, such as silver or a silver alloy, is used. The second fixed contact 16 and the second movable contact 17 function as a sub-contact, and a material having a high melting point, such as tungsten, is used.

It is noted that the first stationary contact 14 and the first movable contact 15 are preferably made of a material having a low resistivity and a high electrical conductivity, including but not limited to silver, silver alloy, and copper. The second fixed contact 16 and the second movable contact 17 are preferably made of a conductive material having a high melting point, including but not limited to tungsten steel, tungsten, a tungsten alloy, or a molybdenum alloy, and the like, which can also be used as a raw material of the second fixed contact 16 and the second movable contact 17.

Example 4:

in this embodiment, the manner and structure of connection between the relay and the external circuit are further optimized and defined based on embodiment 1.

As shown in fig. 1 and 3, the socket further comprises a pin assembly for connecting the control circuit and the working circuit with an external circuit, and the pin assembly can be directly plugged into a socket matched with the pin assembly to realize electric connection and can also be connected with the external circuit through the plug assembly.

The pin assembly is an intermediate structure for connecting a control circuit and a working circuit in the relay with the outside, wherein the control circuit needs to be connected with a power supply to supply current for the electromagnet 13, and the working circuit is connected in series in the controlled circuit to play a role in controlling the circuit to be opened and closed.

Example 5:

in this embodiment, based on embodiment 4, the pin assembly is further optimized and defined.

As shown in fig. 3 and 6, the pin assembly includes a first pin 4 electrically connected to the first stationary contact 14 and the second stationary contact 16, and a second pin 6 electrically connected to the first movable contact 15 and the second movable contact 17; and the third pin 5 and the fourth pin 7 are electrically connected with the electromagnet 13 to form a current loop inside the electromagnet 13.

The essence of this embodiment is that the fixed contacts are connected with one pin at the same time, the moving contacts are connected with one pin at the same time, so as to form a passage through which current passes through the first pin 4, the fixed contacts, the moving contacts and the second pin 6 in sequence, so as to ensure the opening and closing of the contact/disconnection control circuit between the fixed contacts and the moving contacts, and simultaneously, different groups of contacts are connected in parallel with each other. The third pin 5 and the fourth pin 7 are used as the output end and the input end of the relay internal control circuit to be connected with a power supply.

Example 6:

the embodiment further optimizes and defines the plug-in assembly on the basis of the

embodiment

4 or 5.

As shown in fig. 1-2, the plug assembly includes a plug 18 and a conductive plate 19, the pin is plugged into the plug 18 and electrically contacts the conductive plate 19, and the conductive plate 19 is connected to an external circuit. The plug assembly further comprises a locking member 20 for releasably securing the pin to the plug 18 and the plate 19.

As shown in fig. 1, the pin assembly of the relay is connected to the plug assembly, and the plug assembly is connected to an external circuit through a plug. The plug 18 is illustrated as a semi-enclosed shape, the pin is inserted into the plug 18, a conductive plate 19 is provided on a surface of the pin not in contact with the plug 18, the pin, the plug 18 and the conductive plate 19 are fixed by a locking member 20 such as a screw, and the conductive plate 19 is connected to the plug by a wire and, in use, is connected to an external circuit by the plug.

It should be noted that the plug assembly is provided for convenience of mounting the relay, and the shape of the plug assembly is not limited to the shape shown in fig. 2. The plug-in component can also be a plug-in connector 18 which is surrounded on all sides, and a conducting strip 19 is arranged in the plug-in component, so that the pin is directly inserted into the plug-in connector 18, is fixed by the plug-in connector 18 and is in conductive connection with the conducting strip 19.

In addition, according to the functions of the pins in the pin assembly, the first pin 4 and the second pin 6 can share one controlled circuit connection plug 2, and the third pin 5 and the fourth pin 7 can share one electromagnet power supply plug 3.

Example 7:

in the above embodiment, when the working circuit is connected, a current path is formed to the second pin 6 through the first pin 4, the fixed contact, the movable contact, the conductive spring, the spring 12, and the yoke 8 in sequence. In this embodiment, as shown in fig. 10, a braided wire 21 having a conductive function is provided, and both ends of the braided wire 21 are connected to the conductive elastic piece and the portion of the second pin 6 located inside the housing 1, respectively. Preferably, the first conductive elastic sheet 10 and the second conductive elastic sheet 11 are integrated, and the positions for installing the contacts are forked, so that the braided wire 21 can be conveniently connected with any one conductive elastic sheet to form a structure in parallel connection between the two conductive elastic sheets.

Under the condition that the braided wire 21 is arranged, a working circuit forms a current path which sequentially passes through the first pin 4, the fixed contact, the movable contact, the conductive elastic sheet and the second pin 6 of the braided wire 21, so that the current path is simpler, and the problem that the interior of the relay generates heat due to the fact that the intermediate resistance is larger because the conductive parts are too much is avoided.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-contact arc-extinguishing relay comprising a control circuit and an operating circuit, the control circuit comprising an electromagnet (13), the operating circuit comprising a stationary terminal and a movable terminal, the electromagnet (13) acting according to a current variation in an input control circuit to thereby control the stationary terminal and the movable terminal of the operating circuit to be in/out of contact, characterized in that:

at least two groups of contacts are arranged on the static end and the movable end;

the distance between one group of contacts is larger than that between the other group of contacts, when the current of the control circuit changes, each group of contacts is contacted/disconnected in sequence, and the melting point of the later disconnected contacts is higher than that of the first disconnected contacts.

2. A multi-contact arcing relay according to claim 1, wherein: the control circuit also comprises a yoke iron (8) fixedly connected with the electromagnet (13) and an armature iron (9) movably connected with the yoke iron (8);

the movable end comprises conductive elastic pieces corresponding to the number of the contacts, the conductive elastic pieces are fixedly connected with the armature (9), and the armature (9) is controlled by the electromagnet (13) to act so that the contacts of the movable end and the static end are contacted/disconnected.

3. A multi-contact arcing relay according to claim 2, wherein: the control circuit also comprises a reed (12) with two ends respectively fixedly connected with the yoke iron (8) and the armature iron (9).

4. A multi-contact arcing relay according to claim 2, wherein: the static end comprises a first static contact (14) and a second static contact (16), and the movable end comprises a first movable contact (15) and a second movable contact (17) which respectively correspond to the static end and the movable end;

the distance between the first fixed contact (14) and the first movable contact (15) is larger than the distance between the second fixed contact (16) and the second movable contact (17).

5. A multi-contact arcing relay according to claim 4, wherein: the first fixed contact (14) and the first movable contact (15) adopt silver or silver alloy as contact materials, and the second fixed contact (16) and the second movable contact (17) adopt tungsten steel as contact materials.

6. A multi-contact arcing relay according to claim 1, wherein: the pin assembly can be directly inserted into a socket matched with the pin assembly to realize electric connection and can be connected with an external circuit through the inserted assembly.

7. A multi-contact arcing relay according to claim 6, wherein: the pin assembly comprises a first pin (4) which is in conductive connection with a first fixed contact (14) and a second fixed contact (16), and a second pin (6) which is in conductive connection with a first movable contact (15) and a second movable contact (17); and the third pin (5) and the fourth pin (7) are electrically connected with the electromagnet (13) to form a current loop in the electromagnet (13).

8. A multi-contact arcing relay according to claim 6, wherein: the plug assembly comprises a plug connector (18) and a conducting strip (19), the pin is plugged with the plug connector (18) and is in contact with the conducting strip (19) for conducting electricity, and the conducting strip (19) is connected with an external circuit.

9. A multi-contact arcing relay as claimed in claim 8, wherein: the plug assembly further comprises a locking member (20) which can detachably and fixedly connect the pin with the plug connector (18) and the conducting sheet (19).