relay

Abstract

The present application relates to a relay comprising a pair of fixed contacts and a plurality of movable contact pieces. A pair of fixed contacts are arranged along a first direction, and each fixed contact comprises a plurality of fixed contact portions; each movable contact piece comprises two movable contact portions, and the two movable contact portions are configured to contact the fixed contact portions of the fixed contacts; for each fixed contact and the plurality of movable contact pieces, a plurality of groups of corresponding movable contact portions and fixed contact portions have a first projection formed by overlapping each other of the respective orthographic projections formed on a target plane, and at least one of the plurality of first projections is arranged to be offset from the remaining first projections in a third direction, and furthermore, there is no overlapping area between the orthographic projections on the target plane by the plurality of movable contact pieces; a second direction is defined as the direction of movement of the plurality of movable contact pieces, and any two of the first direction, second direction, and third direction are perpendicular to each other, and the target plane is perpendicular to the second direction.

Description

Technology Field

[0001] This application claims priority to a Chinese patent application filed on February 7, 2024, with application number 202410174732.6 and titled "Relay," all of which are by reference.

[0002] This application relates to the field of electrical control element technology, and in particular to relays. Background Technology

[0003] A relay is an electronic control device equipped with a control system (also called an input circuit) and a controlled system (also called an output circuit), and is generally applied in automatic control circuits. In practice, a relay is a type of "automatic switch" that controls a large current using a small current. Therefore, it performs roles such as automatic regulation, safety protection, and circuit switching in a circuit.

[0004] A high-voltage DC relay is a type of relay, and a conventional high-voltage DC relay includes an insulating cover, a fixed contact, and a movable contact piece. The fixed contact is mounted on the insulating cover, and the closing and opening of the relay contacts are achieved through the contact and separation of the fixed contact and the movable contact piece. When the relay interrupts a relatively large load, a very high-energy arc is generated between the fixed contact and the movable contact piece. This arc easily causes high-temperature erosion of the movable contact and the fixed contact, making it impossible to meet the requirements of a high-voltage, high-current load.

[0005] Accordingly, in conventional technology, a technical solution was proposed to place arc-extinguishing permanent magnets on the outer surface of an insulating cover. However, the arc-extinguishing performance of the relay in the conventional technology needs to be further improved. means of solving the problem

[0006] According to various embodiments of the present application, a relay capable of improving the arc extinguishing performance of the relay is provided.

[0007] The relay according to the embodiment of the present application is,

[0008] A pair of fixed contacts arranged along a first direction—each of the fixed contacts includes a plurality of fixed contact portions—;

[0009] A plurality of movable contact pieces—each of which the movable contact piece includes two movable contact portions, and the two movable contact portions are configured to contact the fixed contact portions of the fixed contact member—, wherein between each of the fixed contact member and the plurality of movable contact pieces, a plurality of groups of corresponding movable contact portions and the fixed contact portions have a first projection formed by overlapping each of the respective orthogonal projections formed on the target plane, and at least one of the plurality of first projections is arranged to be offset from the remaining first projections.

[0010] In one embodiment, the orthographic projections on the target plane by the plurality of movable contact pieces do not have overlapping regions.

[0011] In one embodiment, at least one of the plurality of first projections is positioned offset from the remaining first projections in a third direction;

[0012] The second direction is defined as the direction of movement of a plurality of the above-mentioned movable contact pieces, and any two of the first direction, the second direction, and the third direction are perpendicular to each other, and the target plane is perpendicular to the second direction.

[0013] In one embodiment, each of the movable contact pieces has one movable contact portion formed at each end in the longitudinal direction;

[0014] The length of at least one of the above-mentioned movable contact pieces is longer than the length of the remaining above-mentioned movable contact pieces.

[0015] In one embodiment, both ends of the relatively long movable contact piece protrude from the remaining movable contact piece in a first direction.

[0016] In one embodiment, the number of movable contact pieces is three, and the three movable contact pieces are arranged along the third direction; and each of the fixed contacts includes three fixed contact portions;

[0017] The length of the central movable contact piece is longer than the length of the remaining two movable contact pieces.

[0018] In one embodiment, the lengths of the remaining two movable contact pieces are equal to each other.

[0019] In one embodiment, the contact gap between at least one of the plurality of movable contact pieces and the fixed contact is smaller than the contact gap between the remaining movable contact pieces and the fixed contact.

[0020] In one embodiment, each of the movable contact pieces has one movable contact portion formed at each end in the longitudinal direction;

[0021] The length of one of the above-mentioned movable contact pieces is longer than the length of the remaining above-mentioned movable contact pieces, and the contact gap between the longer movable contact piece and the fixed contact is smaller.

[0022] In one embodiment, the number of movable contact pieces is three, and the three movable contact pieces are arranged along a third direction; and each of the fixed contacts includes three fixed contact portions;

[0023] The length of the central movable contact piece is longer than the length of the remaining two movable contact pieces, and the lengths of the remaining two movable contact pieces are equal to each other.

[0024] In one embodiment, the relay is,

[0025] A short-circuit resistant structure configured to form an attractive force in the contact closing direction on at least one of the above-mentioned movable contact pieces—the attractive force on the movable contact piece with a smaller contact gap is smaller than the attractive force on each of the remaining movable contact pieces—further includes.

[0026] In one embodiment, the short-circuit resistant structure comprises a first magnetic flux inductor and at least one second magnetic flux inductor, and

[0027] The first magnetic flux inductor is positioned on one side facing the fixed contact of a plurality of the movable contact pieces; and the first magnetic flux inductor and each of the movable contact pieces have a third projection formed by the superposition of their respective orthographic projections formed on the target plane;

[0028] Among the plurality of the above-mentioned movable contact pieces, excluding the movable contact piece with a smaller contact gap, the remaining movable contact pieces are each fixedly connected to one side opposite the fixed contact, with one of the second magnetic flux inductors being fixedly connected, and the first magnetic flux inductor is configured to form a magnetic circuit with at least one of the second magnetic flux inductors.

[0029] In one embodiment, the short-circuit resistance structure comprises at least one first magnetic flux inductor and at least one second magnetic flux inductor, and

[0030] The at least one first magnetic flux inductor is disposed on one side facing the fixed contact of a plurality of the movable contact pieces; along the contact closing direction, the number and position of the at least one first magnetic flux inductor correspond to the number and position of the remaining movable contact pieces, respectively;

[0031] Among the plurality of the above-mentioned movable contact pieces, excluding the movable contact piece with a smaller contact gap, the remaining movable contact pieces are each fixedly connected to one side opposite the fixed contact, with one of the above-mentioned second magnetic flux inductors being fixedly connected, and the corresponding above-mentioned first magnetic flux inductors and above-mentioned second magnetic flux inductors are configured to form a magnetic circuit.

[0032] In one embodiment, the suction force on the movable contact piece with a smaller contact gap is 0.

[0033] In one embodiment, the short-circuit resistant structure comprises at least one first magnetic flux inductor, and

[0034] Among the plurality of the above-mentioned movable contact pieces, excluding the movable contact piece with a smaller contact gap, the remaining movable contact pieces each have one of the above-mentioned first magnetic flux inductors disposed on one side facing the fixed contactor.

[0035] In one embodiment, the short-circuit resistance structure includes a first magnetic flux inductor and a plurality of second magnetic flux inductors, and

[0036] The first magnetic flux inductor is positioned on one side facing the fixed contact of a plurality of the movable contact pieces; and the first magnetic flux inductor and each of the movable contact pieces have a third projection formed by the superposition of their respective orthographic projections formed on the target plane;

[0037] Each of the above-mentioned movable contact pieces has one of the above-mentioned second flux inductors fixedly connected to one side opposite the above-mentioned fixed contact, and the first flux inductor and the second flux inductor are configured to form a magnetic circuit; the thickness of the second flux inductor corresponding to the movable contact piece with a smaller contact gap is smaller than the thickness of the second flux inductor corresponding to the remaining movable contact piece.

[0038] In one embodiment, the relay further includes an insulating cover, the insulating cover having an internal space and a pair of mounting holes communicating with the internal space;

[0039] Each of the above-mentioned fixed contacts includes a protrusion, a connecting portion, and a contact portion, wherein the protrusion and the contact portion are connected through the connecting portion, and two of the connecting portions are each inserted and disposed within a pair of the above-mentioned mounting holes, wherein the protrusion is located on the outer surface of the insulating cover and is connected to the insulating cover; and the contact portion is located within the above-mentioned internal space and includes a plurality of the above-mentioned fixed contact portions;

[0040] In each of the above fixed contacts, at least one of the fixed contact portions protrudes at least a portion of the outer surface of the connection portion.

[0041] In one embodiment, a plurality of fixed contact portions of each of the fixed contacts include a first fixed contact portion and a second fixed contact portion; along the first direction, the two first fixed contact portions of the two fixed contacts each protrude with respect to the outer surface of the corresponding connecting portion in a direction in which at least a portion moves away from each other;

[0042] The second fixed contact portion of each of the above fixed contacts has at least a portion protruding from the outer surface of the connection portion, and there is an indentation between the direction of protrusion of the second fixed contact portion and the direction of protrusion of the first fixed contact portion.

[0043] In one embodiment, among the outer surfaces of the insulating cover, a first permanent magnet is disposed at a position corresponding to the first fixed contact portion, and a second permanent magnet is disposed at a position corresponding to the second fixed contact portion;

[0044] The polarity of the surface of the first permanent magnet facing the insulating cover is opposite to the polarity of the surface of the second permanent magnet facing the insulating cover.

[0045] In one embodiment, the second fixed contact portion protrudes at least a portion along the third direction relative to the outer surface of the connection portion.

[0046] In one embodiment, a plurality of fixed contact portions of each of the fixed contacts further include a third fixed contact portion;

[0047] Along the third direction, at least a portion of the second fixed contact portion and at least a portion of the third fixed contact portion at each of the fixed contacts protrude from the outer surface of the connection portion in a direction away from each other.

[0048] In one embodiment, among the outer surfaces of the insulating cover, a first permanent magnet is disposed at a position corresponding to the first fixed contact portion, a second permanent magnet is disposed at a position corresponding to the second fixed contact portion, and a third permanent magnet is disposed at a position corresponding to the third fixed contact portion;

[0049] The polarity of the surface of the second permanent magnet facing the insulating cover is the same as the polarity of the surface of the third permanent magnet facing the insulating cover, and opposite to the polarity of the surface of the first permanent magnet facing the insulating cover.

[0050] In one embodiment, the protrusion and the connecting part are an integrated structure, and the contact part and the connecting part are a separate structure.

[0051] In one embodiment, the protrusion and the connecting portion are made of a first material, and the contact portion is made of a second material different from the first material.

[0052] In one embodiment, at least one fixed contact portion in each of the fixed contacts protrudes at least a portion of the outer surface of the protrusion.

[0053] In a relay according to an embodiment of the present application, a plurality of groups of corresponding movable contact parts and fixed contact parts in each fixed contact and a plurality of movable contact parts have a first projection in which each of the orthogonal projections formed on a target plane overlaps with each other, and at least one of the plurality of first projections is arranged to be offset from the remaining first projections in a third direction, so that arc generation points formed between the plurality of fixed contact parts and the plurality of movable contact parts are arranged to be offset in a third direction, thereby increasing the distance between the arc generation points and preventing arcs formed at the plurality of arc generation points from concentrating and influencing each other, which is advantageous for improving arc extinguishing performance.

[0054] In addition, since the length of the central movable contact piece is longer than the length of the remaining movable contact pieces and the contact gap between the central movable contact piece and the fixed contact is relatively small, an arc is generated only at both ends of the central movable contact piece and not at the remaining movable contact piece, so the arc generated at both ends of the central movable contact piece can be guided to a space where the central movable contact piece exceeds the remaining movable contact piece, and the direction of arc guidance avoids the remaining movable contact piece and the fixed contact part corresponding to the remaining movable contact piece, thereby preventing the arc from causing high-temperature erosion of the remaining movable contact piece.

[0055] In addition, the relay according to the embodiment of the present application further includes a short-circuit tolerance structure, and when combined with a design in which the contact gap between at least one of the plurality of movable contacts and a fixed contact is smaller than the contact gap between the remaining movable contacts and a fixed contact, it is not only advantageous for implementing limit interruption between contacts, but also delays the opening of the contacts in the event of a short circuit, thereby ensuring the reliability of the relay operation and extending the lifespan of the product.

[0056] In addition, at least one fixed contact portion of each fixed contact is partially protruded from the outer surface of the connection portion, so that the contact position between the movable contact piece and the fixed contact is brought closer to the insulating cover, that is, the arc generation point is brought closer to the insulating cover, thereby obtaining the effect of rapidly cooling the arc and being advantageous for improving arc extinction performance. Effects of the invention

[0057] To more clearly explain the embodiments and / or examples of the present application, reference may be made to one or more drawings. Additional details or examples used to explain the drawings shall not be construed as limiting the scope of any of the disclosed application, the embodiments and / or examples currently described, and the preferred modes of the present application as currently understood.

[0058] FIG. 1 is a schematic perspective view of a relay according to an embodiment of the present application.

[0059] FIG. 2 is a schematic side view of a relay according to an embodiment of the present application.

[0060] Figure 3 is a cross-sectional view taken along the AA cutting line of Figure 1.

[0061] Figure 4 is a schematic perspective view of a fixed contact.

[0062] Figure 5 is a schematic exploded view of a fixed contact.

[0063] FIG. 6 is a schematic perspective view of three movable contact pieces.

[0064] FIG. 7 is a schematic perspective view of a fixed contactor, a movable contact piece, a first magnetic flux inductor, and a second magnetic flux inductor.

[0065] Figure 8 is a cross-sectional view taken along the BB cutting line of Figure 2.

[0066] Figures 9 and 10 are schematic diagrams showing two arc extinguishing directions.

[0067] FIG. 11 is a schematic partial view of a state in which all three movable contact pieces are not in contact with the fixed contact.

[0068] FIG. 12 is a schematic partial view of a state in which the middle movable contact piece among the three movable contact pieces is in contact with the fixed contact, and the remaining two movable contact pieces are not in contact with the fixed contact.

[0069] FIG. 13 is a schematic partial view of a state in which all three movable contact pieces are in contact with a fixed contact.

[0070] Figure 14 is a schematic diagram of a short-circuit resistant structure.

[0071] FIGS. 15 to 17 are schematic diagrams of a short-circuit resistant structure and a plurality of movable contact pieces according to three different embodiments, respectively. Specific details for implementing the invention

[0072] To facilitate understanding of the present application, the application will be described more comprehensively below with reference to the attached drawings. The drawings illustrate preferred embodiments of the present application. However, the present application is not limited to the embodiments described herein and may be implemented in various other forms. Such embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present application.

[0073] All technical and scientific terms used in this specification have the same meaning as generally understood by those skilled in the art, unless otherwise defined. The terms used in this specification are intended to specifically describe the embodiments and are not to be interpreted as limiting the scope of this application.

[0074] In the embodiments of this application, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or facility comprising a series of steps or units is not limited to the listed steps or units, but optionally further comprises unlisted steps or units, or optionally further comprises other steps or assemblies unique to such process, method, product, or facility.

[0075] Furthermore, embodiments of the present invention are disclosed below with reference to the accompanying drawings, and many practical details will be described together in the following description for clarity. However, these practical details should not be understood as limiting the present invention.

[0076] Furthermore, it will be understood that for the sake of clarity in the drawings, some conventional structures and elements may be briefly illustrated. Additionally, while some features in the drawings of this specification may be enlarged or their proportions or sizes altered to facilitate understanding and observation, this should not be understood as limiting the invention. It will be understood that the actual dimensions and specifications of a product manufactured based on the content disclosed according to the invention may be adjusted in combination with production demand, the characteristics of the product itself, and the content disclosed below regarding the invention.

[0077] As illustrated in FIGS. 1 to 3, the relay according to an embodiment of the present application includes an insulating cover (21), a yoke plate (25), a pair of fixed contacts (22), an arc extinguishing part (26), a movable assembly (30), and a magnetic circuit part (40).

[0078] The insulating cover (21) has an internal space (212), and a pair of fixed contacts (22) are mounted on the upper part of the insulating cover (21), at least a portion of each fixed contact (22) extends into the internal space (212) of the insulating cover (21), and a fixed contact is also disposed at the lower part of each fixed contact (22), and the fixed contact may be disposed integrally or separately at the lower part of the fixed contact (22). One fixed contact (22) acts as a current inflow terminal, and the other fixed contact (22) acts as a current outflow terminal.

[0079] In one embodiment, two mounting holes (211) are formed in the upper part of the insulating cover (21), and each mounting hole (211) communicates with an internal space (212). A pair of fixed contacts (22) are each positioned through the two mounting holes (211). Each fixed contact (22) and the insulating cover (21) may be connected by welding, but are not limited thereto.

[0080] As can be understood, the insulating cover (21) may be made of ceramic material, that is, the insulating cover (21) may be a ceramic cover, but is not limited thereto, and for example, in other embodiments, the insulating cover (21) may be made of plastic material.

[0081] In one embodiment, the insulating cover (21) is made of ceramic material and is connected to the yoke plate (25) through a frame member (24). The frame member (24) may be a metal member with an annular structure, for example, an iron-nickel alloy. One end of the frame member (24) is connected to the opening edge of the insulating cover (21), for example, by a method such as laser welding, brazing, resistance welding, or bonding. The other end of the frame member (24) is connected to the yoke plate (25), and likewise can be connected by a method such as laser welding, brazing, resistance welding, or bonding. By placing the frame member (24) between the insulating cover (21) and the yoke plate (25), the connection between the insulating cover (21) and the yoke plate (25) is facilitated.

[0082] Referring further to FIG. 3, the movable assembly (30) includes a movable contact piece (31), a first elastic member (32), and a push rod member (33).

[0083] For convenience of explanation, the arrangement direction of a pair of fixed contactors (22) is defined as the first direction (D1), and the movement direction of the movable contact piece (31) is defined as the second direction (D2), wherein the first direction (D1) and the second direction (D2) are perpendicular. A direction perpendicular to both the first direction (D1) and the second direction (D2) is defined as the third direction (D3).

[0084] Here, the movable contact piece (31) is disposed within the insulating cover (21), and the movable contact piece (31) is configured such that both ends along the first direction (D1) are in contact with or separated from the lower portions of a pair of fixed contacts (22).

[0085] The push rod member (33) is movably positioned through the first through hole (251) of the yoke plate (25), and a portion of the push rod member (33) protrudes from one side surface of the yoke plate (25) toward the fixed contactor (22), and a portion of the push rod member (33) protrudes from one side surface of the yoke plate (25) opposite the fixed contactor (22).

[0086] The movable contact piece (31) is movably mounted on a portion protruding from one side surface of the push rod member (33) toward the fixed contactor (22) of the yoke plate (25). The first elastic member (32) is connected to the push rod member (33) and the movable contact piece (31) and is configured to provide contact pressure by applying an elastic force toward the movable contact piece (31) toward the fixed contactor (22).

[0087] As an example, the first elastic member (32) may be a spring or a leaf spring, but is not limited thereto. Additionally, the number of the first elastic members (32) may be one or multiple, and when the number of the first elastic members (32) is multiple, the multiple first elastic members (32) may all be springs, all be leaf springs, or a combination of leaf springs and springs, and the present application is not specifically limited thereto.

[0088] A metal cover (27) is disposed on one side surface opposite the fixed contactor (22) of the yoke plate (25), and the metal cover (27) covers the first through hole (251) of the yoke plate (25). Here, a portion of the push rod member (33) protruding from one side surface opposite the fixed contactor (22) of the yoke plate (25) is inserted into the metal cover (27).

[0089] Referring again to FIG. 3, the magnetic circuit section (40) includes a movable core (41), a fixed core (42), a coil bobbin (43), and a coil (44). The coil bobbin (43) is hollow and cylindrical in shape and is made of insulating material. The coil bobbin (43) is located on one side opposite the fixed contactor (22) of the yoke plate (25) and is positioned to surround the outer circumference of the metal cover (27). The coil (44) is wound around the outer circumference of the coil bobbin (43).

[0090] The fixed core (42) is fixedly positioned within the metal cover (27), and a portion of the fixed core (42) is inserted into the first through hole (251). The fixed core (42) has a second through hole (421), and the second through hole (421) is positioned such that it corresponds to the first through hole (251), thereby allowing the push rod member (33) to be movably positioned through the first through hole (251) and the second through hole (421). The movable core (41) is movably positioned within the metal cover (27) and is positioned opposite the fixed core (42) in the second direction (D2), and the movable core (41) is connected to the push rod member (33) and configured to be attracted to the fixed core (42) when the coil (44) is energized. The movable core (41) and the push rod member (33) may be connected by screw, rivet, welding, or other means.

[0091] As illustrated in FIG. 3, the magnetic circuit portion (40) further includes a second elastic member (46), the second elastic member (46) is located within the metal cover (27), is positioned between the fixed core (42) and the movable core (41), and is configured to return the movable core (41) when the power to the coil (44) is cut off.

[0092] In one embodiment, the second elastic member (46) is a spring and is sleeved and disposed on the outer circumference of the push rod member (33), but is not limited thereto.

[0093] It should be noted that when the coil (44) is energized, the fixed core (42) attracts the movable core (41) to move upward, and the movable core (41) can move the push rod member (33) upward. When the movable contact piece (31) contacts the fixed contact member (22), the movable contact piece (31) is stopped by the fixed contact member (22), and the push rod member (33) continues to move upward until over travel is completed.

[0094] During the overtravel process, the first elastic member (32) can provide contact pressure by providing elastic force to the movable contact piece (31) after being compressed by the push rod member (33).

[0095] As illustrated in FIGS. 2 and 3, the magnetic circuit section (40) further includes a U-shaped yoke (47) and a magnetic conduction cylinder (45). The U-shaped yoke (47) includes a bottom yoke (471) and two side yokes (472), each of which is connected to both ends along the first direction (D1) of the bottom yoke (471), and the two side yokes (472) are positioned opposite each other along the first direction (D1). The bottom yoke (471) is positioned on one side opposite the fixed contactor (22) of the coil bobbin (43), and one end of each of the two side yokes (472), which is separated from the bottom yoke (471), is connected to both ends along the first direction (D1) of the yoke plate (25). The coil (44), coil bobbin (43), metal cover (27), and movable core (41) are accommodated within a space enclosed by the yoke plate (25), the bottom yoke (471) of the U-shaped yoke (47), and two side yokes (472). The magnetic conduction cylinder (45) is sleeved and positioned on the outer circumference of the metal cover (27), and the magnetic conduction cylinder (45) is located between the metal cover (27) and the coil bobbin (43).

[0096] As illustrated in FIG. 3, the arc extinguishing section (26) includes a permanent magnet (262), and the permanent magnet (262) is placed on the outer surface of the insulating cover (21). By placing the permanent magnet (262) on the outer circumference of the insulating cover (21), a magnetic field can be formed around the fixed contact (22) and the movable contact piece (31). Thus, the arc generated between the fixed contact (22) and the movable contact piece (31) is extended in a direction away from each other by the action of the magnetic field, thereby extinguishing the arc.

[0097] The arc extinguishing section (26) further includes a yoke clamp (261), and a permanent magnet (262) is positioned between one side surface of the yoke clamp (261) facing the insulating cover (21) and the outer surface of the insulating cover (21). By designing the yoke clamp (261) to surround the permanent magnet (262), the magnetic field generated by the permanent magnet (262) can be prevented from spreading outward and affecting the arc extinguishing effect.

[0098] In one embodiment, the yoke clamp (261) is made of a soft magnetic material, and the soft magnetic material may include, but is not limited to, iron, cobalt, nickel, and alloys thereof.

[0099] It can be understood that the number of yoke clamps (261) may be one or two. If the number of yoke clamps (261) is one, the yoke clamp (261) forms an annular structure and surrounds the outer circumference of the insulating cover (21). If the number of yoke clamps (261) is two, each yoke clamp (261) may be U-shaped and arranged oppositely along the first direction (D1), and the two yoke clamps (261) each surround both ends of the insulating cover (21) along the first direction (D1).

[0100] As illustrated in FIGS. 4 and 5, each fixed contact (22) includes a protrusion (221), a connecting portion (222), and a contact portion (223), and the protrusion (221) and the contact portion (223) are connected through the connecting portion (222). The two connecting portions (222) of the two fixed contacts (22) are each inserted and positioned within a pair of mounting holes (211), and the protrusion (221) is located on the outer surface of the insulating cover (21) and is connected to the insulating cover (21). The contact portion (223) is located within the internal space (212) and has a fixed contact portion (2231).

[0101] In one embodiment, the protrusion (221) and the connecting part (222) are an integral structure, and the contact part (223) and the connecting part (222) are a separate structure. If the contact part (223) and the connecting part (222) are designed as separate structures, the difficulty of processing the fixed contactor (22) can be reduced, thereby reducing costs.

[0102] Additionally, the protrusion (221) and the connecting part (222) are made of the first material, and the contact part (223) is made of the second material, and the first material and the second material are different.

[0103] It should be noted that since the protrusion (221) of the fixed contactor (22) is configured to be electrically connected to a copper busbar and the contact portion (223) of the fixed contactor (22) is configured to be in contact with a movable contact piece (31), the protrusion (221) requires a material with high conductivity and the contact portion (223) requires a material with anti-adhesion properties.

[0104] In one embodiment, by designing the protrusion (221) and the contact portion (223) as a separable structure, the protrusion (221) may be selected from a first material having high conductivity, for example, oxygen-free copper, and the contact portion (223) may be selected from a second material having anti-adhesion properties, for example, a copper alloy. Of course, the first material and the second material are not limited to oxygen-free copper and a copper alloy.

[0105] Additionally, the method of connecting the connecting part (222) and the contact part (223) may be welding, riveting, interference fitting, etc., and the present application is not specifically limited thereto.

[0106] In an embodiment of the present application, it can be understood that the connecting portion (222) is cylindrical in shape, the protrusion (221) is connected to one end of the connecting portion (222) in the axial direction, and the contact portion (223) is connected to the other end of the connecting portion (222) in the axial direction. The protrusion (221) is approximately disc-shaped, and the axis of the protrusion (221) coincides with the axis of the connecting portion (222). The diameter of the protrusion (221) is larger than the diameter of the connecting portion (222). Of course, in other embodiments, the fixed contactor (22) may be designed with other regular or irregular shapes, and the present application is not limited thereto.

[0107] In one embodiment, the contact portion (223) also has a base portion (2232), the base portion (2232) is connected to the connecting portion (222), and the fixed contact portion (2231) is connected to the base portion (2232). As an example, the shape of the base portion (2232) may be a disc shape, and the fixed contact portion (2231) is formed protruding from the outer surface of the base portion (2232).

[0108] It can be understood that the number of fixed contact portions (2231) included in the contact portion (223) may be one or multiple.

[0109] As illustrated in FIG. 6, the movable contact piece (31) has a movable contact portion (311) corresponding to a fixed contact portion (2231). The contact / separation direction of the corresponding movable contact portion (311) and the fixed contact portion (2231) is perpendicular to the yoke plate (25). A movable contact portion (311) is formed at each end of the longitudinal direction (i.e., the first direction (D1)) of the movable contact piece (31), and two fixed contact portions (2231) located on different fixed contacts (22) correspond to two movable contact portions (311) of one movable contact piece (31).

[0110] Of course, in other embodiments, the movable contact portion (311) may not be positioned at the longitudinal end of the movable contact piece (31). The movable contact portion (311) may also be positioned at other locations on the movable contact piece (31), for example, the movable contact portion (311) may be positioned close to the end of the movable contact piece (31).

[0111] It should be noted that the number of movable contact pieces (31) included in the movable assembly (30) may be one or multiple. If the number of movable contact pieces (31) is multiple, the multiple movable contact pieces (31) may be arranged side by side along the third direction (D3), and each movable contact piece (31) is configured such that the movable contact portions (311) at both ends along the first direction (D1) contact or separate from a pair of fixed contacts (22).

[0112] After a plurality of movable contact pieces (31) each contact a pair of fixed contacts (22) at the movable contact portions (311) at both ends along the first direction (D1), a reliable parallel circuit is formed. The number of contacts formed by the plurality of movable contact pieces (31) and one fixed contact (22) is two or more, thereby realizing a current distribution effect. In addition, according to the principle that the magnitude of the electrical repulsion force is proportional to the square of the current, the magnitude of the electrical repulsion force of each contact is significantly reduced, which is advantageous for improving short-circuit resistance and increasing the reliability of the relay.

[0113] It can be understood that the number of movable contact pieces (31) corresponds to the number of fixed contact portions (2231) included in one fixed contact (22). For example, when the number of movable contact pieces (31) is 1, the contact portion (223) of each fixed contact (22) has one fixed contact portion (2231); when the number of movable contact pieces (31) is 2, the contact portion (223) of each fixed contact (22) has two fixed contact portions (2231); when the number of movable contact pieces (31) is 3, the contact portion (223) of each fixed contact (22) has three fixed contact portions (2231); and this can continue in this manner, which is not listed here.

[0114] Of course, in other embodiments, the movable contact piece (31) may also come into contact with a plurality of fixed contact portions (2231) of the fixed contact member (22).

[0115] Below, an example is given in which the number of movable contact pieces (31) is 3, and the contact portion (223) of each fixed contact member (22) has 3 fixed contact portions (2231).

[0116] As illustrated in FIGS. 7 and 8, the movable contact part (311) and the fixed contact part (2231) corresponding to the movable contact piece (31) and the fixed contact member (22) have a first projection in which the respective orthographic projections formed on a target plane overlap each other, and the orthographic projection of the connecting part (222) formed on the target plane is a second projection, and at least a part of the first projection is located outside the second projection; where the target plane is perpendicular to the direction of movement (second direction (D2)) of the movable contact piece (31).

[0117] A relay according to an embodiment of the present application has a first projection in which a movable contact portion (311) and a fixed contact portion (2231) overlap on a target plane, and a connecting portion (222) of a fixed contact (22) forms a second projection on a target plane, and at least a part of the first projection is located outside the second projection, so that the contact position of the movable contact piece (31) and the fixed contact (22) is closer to the insulating cover (21), that is, the arc generation point is closer to the insulating cover (21), so that the effect of rapidly cooling the arc can be obtained and is advantageous for improving arc extinction performance.

[0118] In addition, when the number of movable contact pieces (31) is multiple, at least a portion of the first projection is located outside the second projection, so the third direction (D3) spacing between two adjacent movable contact pieces (31) can be widened, so that the space between adjacent movable contact pieces (31) is not affected, and the third direction (D3) spacing between two adjacent short-circuit resistant structures can also be widened, so that the magnetic fields between adjacent short-circuit resistant structures do not interfere with each other.

[0119] In an embodiment of the present application, it can be understood that three fixed contact portions (2231) included in the fixed contactor (22) each form a first projection on a target plane with a corresponding movable contact piece (31). In one embodiment, each first projection may be entirely located outside the second projection. In another embodiment, each first projection may have a portion located outside the second projection and another portion located within the second projection. In yet another embodiment, one or two of the three first projections are entirely located outside the second projection, and the remaining first projection is partially located outside the second projection.

[0120] In one embodiment, a portion of one of the first projections is located outside the second projection, and the other two first projections are entirely located outside the second projection.

[0121] Of course, at least a portion of the first projection is located outside the second projection, and at least a portion of the first projection is located outside the fourth projection, where the fourth projection is an orthographic projection of the protrusion (221) of the fixed contactor (22) formed on the target plane.

[0122] As illustrated in FIGS. 3 and 8, the insulating cover (21) comprises an upper wall (213) and a tubular side wall (214), the upper wall (213) has a mounting hole (211), and a protrusion (221) is located on the outer wall surface of the upper wall (213) and is connected to the outer wall surface of the upper wall (213), for example, by welding. The tubular side wall (214) is connected to the outer circumference of the upper wall (213), and an internal space (212) surrounded by the upper wall (213) and the tubular side wall (214) is formed. At least a portion of the fixed contact portion (2231) protrudes from the outer circumference of the connecting portion (222) in a direction approaching the tubular side wall (214). A permanent magnet is placed at a position corresponding to the fixed contact portion (2231) on the outer wall surface of the tubular side wall (214).

[0123] The shape of the tubular side wall (214) may be a circular tubular structure, a rectangular tubular structure, or other shapes that are regular or irregular, and the present application is not specifically limited thereto.

[0124] In one embodiment, the fixed contact portion (2231) protrudes from the outer surface of the connecting portion (222) in a direction closer to the permanent magnet, thereby causing the arc generation point to be closer to the permanent magnet, and the magnetic field strength is stronger the closer the position is to the permanent magnet, and a stronger magnetic field can improve arc extinguishing performance.

[0125] As illustrated in FIG. 8, the tubular sidewall (214) can be divided into two semicircular structures in the first direction (D1), the two semicircular structures correspond to two fixed contactors (22), and each semicircular structure partially surrounds the corresponding fixed contactor (22), and the direction in which at least a portion of the fixed contact portion (2231) of the fixed contactor (22) approaches the tubular sidewall (214) should be understood as the direction in which at least a portion of the fixed contact portion (2231) of the fixed contactor (22) approaches the semicircular structure that partially surrounds the fixed contactor (22).

[0126] For convenience of explanation, the three fixed contact portions (2231) of the contact portion (223) of each fixed contact (22) are defined as the first fixed contact portion (2231a), the second fixed contact portion (2231b), and the third fixed contact portion (2231c), and the three movable contact pieces (31) are defined as the first movable contact piece (31a), the second movable contact piece (31b), and the third movable contact piece (31c).

[0127] As shown in FIG. 6, the first movable contact piece (31a), the second movable contact piece (31b) and the third movable contact piece (31c) are arranged along the third direction (D3), and the first movable contact piece (31a) is located between the second movable contact piece (31b) and the third movable contact piece (31c).

[0128] In one embodiment, the length of the first movable contact piece (31a) is longer than the length of the second movable contact piece (31b) and the length of the third movable contact piece (31c). The second movable contact piece (31b) and the third movable contact piece (31c) may have the same length or different lengths.

[0129] In one embodiment, the second movable contact piece (31b) and the third movable contact piece (31c) have the same length and are shorter than the length of the first movable contact piece (31a), but are not limited thereto.

[0130] As illustrated in FIGS. 7 and 8, in each fixed contact member (22) and a plurality of movable contact pieces (31), a plurality of groups of corresponding movable contact portions (311) and fixed contact portions (2231) have a first projection in which each of the orthogonal projections formed on a target plane overlaps with each other, and at least one of the plurality of first projections is positioned out of alignment with the remaining first projections.

[0131] For reference, in the above embodiment, "displaced" means that at least one of the plurality of first projections is placed out of alignment with the remaining first projections in one direction (hereinafter referred to as the "direction"), that is, the first projections are placed along the direction, and at least one first projection is not on the same straight line in the direction as the remaining first projections.

[0132] As illustrated in FIGS. 7 and 8, in each fixed contact member (22) and a plurality of movable contact pieces (31), a plurality of groups of corresponding movable contact parts (311) and fixed contact parts (2231) have a first projection in which each orthogonal projection formed on a target plane overlaps with each other, and at least one of the plurality of first projections is arranged to be offset from the remaining first projections in a third direction (D3), and there is no overlapping area in the orthogonal projections on the target plane by the plurality of movable contact pieces (31).

[0133] In one embodiment, for each fixed contact member (22) and a plurality of movable contact pieces (31), a plurality of groups of corresponding movable contact parts (311) and fixed contact parts (2231) exist such that each of the orthogonal projections formed on a target plane overlaps with each other, and at least one of the plurality of first projections is arranged to be offset from the remaining first projections in a third direction (D3), so that the arc generation points formed between the plurality of fixed contact parts (2231) and the plurality of movable contact pieces (31) are arranged to be offset in the third direction (D3), thereby increasing the distance between the arc generation points and preventing arcs formed at the plurality of arc generation points from concentrating and influencing each other, which is advantageous for improving arc extinguishing performance.

[0134] To further explain, in the above embodiment, "arranged out of the third direction (D3)" means that the first projection is arranged along the third direction (D3), and at least one first projection is not on the same straight line as the remaining first projection in the third direction (D3).

[0135] As illustrated in FIG. 8, at least one fixed contact portion (2231) of each fixed contact (22) protrudes at least partially from the outer surface of the connecting portion (222). In one embodiment, along a first direction (D1), two first fixed contact portions (2231a) of two fixed contacts (22) protrude at least partially from the outer surface of their respective corresponding connecting portions (222) in a direction away from each other; and a second fixed contact portion (2231b) of each fixed contact (22) protrudes at least partially from the outer surface of the connecting portion (222), and the direction of protrusion of the second fixed contact portion (2231b) and the direction of protrusion of the first fixed contact portion (2231a) have a first interlocking angle. The third fixed contact portion (2231c) of each fixed contact member (22) has at least a portion protruding from the outer surface of the connecting portion (222), and the direction of protrusion of the third fixed contact portion (2231c) and the direction of protrusion of the first fixed contact portion (2231a) have a second interlocking angle. The first interlocking angle is greater than 0° and less than or equal to 90°, and the second interlocking angle is greater than 0° and less than or equal to 90°.

[0136] In one embodiment, the protrusion direction of the second fixed contact part (2231b) and the protrusion direction of the first fixed contact part (2231a) form a 90-degree angle, and the protrusion direction of the third fixed contact part (2231c) and the protrusion direction of the first fixed contact part (2231a) form a 90-degree angle.

[0137] Additionally, along the third direction (D3), at least a portion of the second fixed contact portion (2231b) and at least a portion of the third fixed contact portion (2231c) at each fixed contact member (22) protrude from the outer surface of the connecting portion (222) in a direction away from each other.

[0138] Among the outer surfaces of the insulating cover (21), a first permanent magnet (262a) is disposed at a position corresponding to the first fixed contact portion (2231a), a second permanent magnet (262b) is disposed at a position corresponding to the second fixed contact portion (2231b), and a third permanent magnet (262c) is disposed at a position corresponding to the third fixed contact portion (2231c); the two first permanent magnets (262a) corresponding to the two first fixed contact portions (2231a) are spaced apart along the first direction (D1), and the two first permanent magnets (262a) are each located on opposite sides facing each other in the first direction (D1) of the two first fixed contact portions (2231a). The polarity of the surface facing the insulating cover (21) of the second permanent magnet (262b) is the same as the polarity of the surface facing the insulating cover (21) of the third permanent magnet (262c), and opposite to the polarity of the surface facing the insulating cover (21) of the first permanent magnet (262a).

[0139] It can be understood that in each fixed contact (22), at least one fixed contact portion (2231) protrudes at least a portion of the outer surface of the protrusion (221).

[0140] The tubular side wall (214) of the insulating cover (21) includes two first side walls (215) spaced apart along a first direction (D1) and two second side walls (216) spaced apart along a third direction (D3), and both ends of the second side walls (216) in the first direction (D1) are each connected to the two first side walls (215).

[0141] In the first direction (D1), a first permanent magnet (262a) is disposed at a position corresponding to the first fixed contact portion (2231a) on the outer wall surface of each first side wall (215); in the third direction (D3), a second permanent magnet (262b) is disposed at a position corresponding to the second fixed contact portion (2231b) on the outer wall surface of the second side wall (216), and a third permanent magnet (262c) is disposed at a position corresponding to the third fixed contact portion (2231c) on the outer wall surface of the second side wall (216).

[0142] In one embodiment, since the number of fixed contactors (22) is two, two groups of first permanent magnets (262a), second permanent magnets (262b), and third permanent magnets (262c) are arranged on the outer wall surface of the insulating cover (21).

[0143] Hereinafter, the direction of the force acting on the arc of the relay according to an embodiment of the present application will be explained in detail by combining FIG. 9 and FIG. 10.

[0144] As illustrated in FIG. 9, the current direction of the fixed contactor (22) on the left flows into the paper surface, and the current direction of the fixed contactor (22) on the right flows outward from the paper surface. The polarity of the surface facing the first side wall (215) of the first permanent magnet (262a) is the S pole, and the polarity of the surface opposite the first side wall (215) is the N pole. The polarity of the surface facing the second side wall (216) of the second permanent magnet (262b) and the third permanent magnet (262c) is the N pole, and the polarity of the surface opposite the second side wall (216) is the S pole. According to the left-hand rule, the net force of the Ampere force received by the arc generated between the fixed contactor (22) on the left and the movable contact piece (31) is F1, and the direction of F1 is the upper left direction. When combining Fig. 9, the direction of F1 passes through the area between the first fixed contact part (2231a) and the second fixed contact part (2231b). As can be seen from this, the direction of F1 avoids the first fixed contact part (2231a) and the second fixed contact part (2231b), and the movable contact part (311) corresponding to the first fixed contact part (2231a) and the second fixed contact part (2231b), so that under the action of F1, the arc is prevented from contaminating the first fixed contact part (2231a) and the second fixed contact part (2231b), and the movable contact part (311) corresponding to the first fixed contact part (2231a) and the second fixed contact part (2231b).

[0145] Likewise, the resultant force of the Ampere force received by the arc between the fixed contact (22) and the movable contact piece (31) on the right is F2, and the direction of F2 is the upper right direction. The direction of F2 passes through the area between the first fixed contact part (2231a) and the third fixed contact part (2231c). As can be seen from this, the direction of F2 avoids the first fixed contact part (2231a) and the third fixed contact part (2231c), and the movable contact part (311) corresponding to the first fixed contact part (2231a) and the third fixed contact part (2231c), so that the arc under the action of F2 prevents contamination of the first fixed contact part (2231a) and the third fixed contact part (2231c), and the movable contact part (311) corresponding to the first fixed contact part (2231a) and the third fixed contact part (2231c).

[0146] As shown in FIG. 10, the current direction of the left fixed contact (22) is opposite to the current direction of the left fixed contact (22) shown in FIG. 9 (i.e., the current direction of the left fixed contact (22) shown in FIG. 10 flows outward from the ground); the current direction of the right fixed contact (22) is opposite to the current direction of the right fixed contact (22) shown in FIG. 9 (i.e., the current direction of the right fixed contact (22) shown in FIG. 10 flows inward from the ground).

[0147] According to the left-hand rule, the resultant force of the Ampere force received by the arc between the left fixed contact (22) and the movable contact piece (31) is F3, and the direction of F3 is the lower left direction. The direction of F3 passes through the area between the first fixed contact part (2231a) and the third fixed contact part (2231c). As can be seen from this, the direction of F3 avoids the first fixed contact part (2231a) and the third fixed contact part (2231c), and the movable contact part (311) corresponding to the first fixed contact part (2231a) and the third fixed contact part (2231c), so that under the action of F3, the arc prevents contamination of the first fixed contact part (2231a) and the third fixed contact part (2231c), and the movable contact part (311) corresponding to the first fixed contact part (2231a) and the third fixed contact part (2231c).

[0148] The resultant force of the Ampere force received by the arc between the fixed contactor (22) and the movable contact piece (31) on the right is F4, and the direction of F4 is the lower right direction. The direction of F4 passes through the area between the first fixed contact part (2231a) and the second fixed contact part (2231b). As can be seen from this, the direction of F4 avoids the first fixed contact part (2231a) and the second fixed contact part (2231b), and the movable contact part (311) corresponding to the first fixed contact part (2231a) and the second fixed contact part (2231b), so that the arc under the action of F4 prevents contamination of the first fixed contact part (2231a) and the second fixed contact part (2231b), and the movable contact part (311) corresponding to the first fixed contact part (2231a) and the second fixed contact part (2231b).

[0149] As shown in FIG. 11, the contact gap between at least one of the plurality of movable contact pieces (31) and the fixed contact (22) is smaller than the contact gap between the remaining movable contact pieces (31) and the fixed contact (22).

[0150] It should be noted that when the number of movable contact pieces (31) is three or more, the contact gap between one of the movable contact pieces (31) and the fixed contact (22) is the smallest, and the contact gaps between the remaining movable contact pieces (31) and the fixed contact (22) may be the same or different.

[0151] In addition, when the number of movable contact pieces (31) is three or more, the contact gaps between two of the movable contact pieces (31) and the fixed contact (22) may be the same and the smallest, and the contact gaps between the remaining movable contact pieces (31) and the fixed contact (22) may be larger than the contact gap of the two movable contact pieces (31).

[0152] In one embodiment, the contact gap between the first movable contact piece (31a) and the first fixed contact portion (2231a) is h1, the contact gap between the second movable contact piece (31b) and the second fixed contact portion (2231b) is h2, the contact gap between the third movable contact piece (31c) and the third fixed contact portion (2231c) is h3, and h1<h2=h3.

[0153] In one embodiment, the length of one of the movable contact pieces (31) is longer than the length of the remaining movable contact pieces (31), and the contact gap between the longer movable contact piece (31) and the fixed contact (22) is smaller.

[0154] In one embodiment, the first movable contact piece (31a) has a longer length, the contact gap between the first movable contact piece (31a) and the fixed contact (22) is smaller, and the contact gaps between the second movable contact piece (31b), the third movable contact piece (31c) and the fixed contact (22) are the same.

[0155] Hereinafter, taking the case where the number of movable contact pieces (31) is three as an example, the energization and breaking sequence of the three movable contact pieces (31) and the fixed contact (22) will be described in detail with reference to FIGS. 11 to 13.

[0156] During the closing process, since the gap between the movable core (41) and the fixed core (42) is a constant value, when the push rod member (33) moves the three movable contact pieces (31) simultaneously in a direction approaching the fixed contact (22), the first movable contact piece (31a) contacts the fixed contact (22) before the second movable contact piece (31b) and the third movable contact piece (31c) because the contact gap of the first movable contact piece (31a) is smaller. That is, the first movable contact piece (31a), which has a smaller contact gap, becomes conductive first. At this time, the second movable contact piece (31b) and the third movable contact piece (31c) have not yet contacted the fixed contact (22) (Fig. 12).

[0157] Next, the push rod member (33) continues to move in a direction approaching the fixed contactor (22). At this time, since the first movable contact piece (31a) has already come into contact with the fixed contactor (22) and can no longer move, only the second movable contact piece (31b) and the third movable contact piece (31c) move in a direction approaching the fixed contactor (22) at this stage, and the second movable contact piece (31b) and the third movable contact piece (31c) also move until they come into contact with the fixed contactor (22) (Fig. 13). At this time, the movable core (41) has not yet come into contact with the fixed core (42). During the process of the second movable contact piece (31b) and the third movable contact piece (31c) moving from the position shown in Fig. 12 to the position shown in Fig. 13, the first movable contact piece (31a) does not move continuously and remains in the overtravel stage.

[0158] Even after the first movable contact piece (31a), the second movable contact piece (31b), and the third movable contact piece (31c) all come into contact with the fixed contactor (22), the movable core (41) continues to move a certain distance until the movable core (41) comes into contact with the fixed core (42). During this stage in which the movable core (41) continues to move, the first movable contact piece (31a), the second movable contact piece (31b), and the third movable contact piece (31c) all stop moving, and at this time, the first movable contact piece (31a), the second movable contact piece (31b), and the third movable contact piece (31c) are all in the overtravel stage.

[0159] As can be seen from this, the overtravel distance of the first movable contact piece (31a) is greater than the overtravel distance of the second movable contact piece (31b) and the third movable contact piece (31c).

[0160] In the blocking process, the blocking may proceed in the order of FIG. 13 → FIG. 12 → FIG. 11. For the first movable contact piece (31a), the second movable contact piece (31b), and the third movable contact piece (31c), the blocking process is a process of releasing overtravel and contact gaps. Since the contact gap of the first movable contact piece (31a) is smaller, the overtravel distance of the first movable contact piece (31a) is larger. Therefore, in the blocking process, the second movable contact piece (31b) and the third movable contact piece (31c) are blocked before the first movable contact piece (31a). That is, the first movable contact piece (31a), which has a smaller contact gap, is blocked later.

[0161] From this, the following conclusion can be drawn. During the closing process, the first movable contact piece (31a) is conducted before the second movable contact piece (31b) and the third movable contact piece (31c); during the blocking process, the second movable contact piece (31b) and the third movable contact piece (31c) are blocked before the first movable contact piece (31a).

[0162] Accordingly, the movable contact portion (311) of the second movable contact piece (31b) and the second fixed contact portion (2231b), and the movable contact portion (311) of the third movable contact piece (31c) and the third fixed contact portion (2231c) serve as current transmissions, while the movable contact portion (311) of the first movable contact piece (31a) and the first fixed contact portion (2231a) serve as arc-resistant. That is, an arc occurs between the movable contact portion (311) of the first movable contact piece (31a) and the first fixed contact portion (2231a), but no arc occurs between the movable contact portion (311) of the second movable contact piece (31b) and the second fixed contact portion (2231b), and between the movable contact portion (311) of the third movable contact piece (31c) and the third fixed contact portion (2231c).

[0163] Furthermore, the arc occurs only at both ends of the longer first movable contact piece (31a), and no arc occurs at the shorter second movable contact piece (31b) and third movable contact piece (31c). Additionally, by combining the directions of the Ampere force described in FIGS. 9 and FIGS. 10, the arc generated at both ends of the first movable contact piece (31a) can be guided into the space created by the difference in length between the first movable contact piece (31a), the second movable contact piece (31b), and the third movable contact piece (31c). Since the guiding direction of the arc avoids the second movable contact piece (31b), the third movable contact piece (31c), and the second fixed contact portion (2231b) and the third fixed contact portion (2231c) corresponding to the second movable contact piece (31b) and the third movable contact piece (31c), the arc does not burn the second movable contact piece (31b) and the third movable contact piece (31c). Prevents.

[0164] According to the above description, the first fixed contact portion (2231a), the second fixed contact portion (2231b), and the third fixed contact portion (2231c) are arranged offset from the third direction (D3), so the distance between the contact position of the movable contact portion (311) of the first movable contact piece (31a) and the first fixed contact portion (2231a), the contact position of the movable contact portion (311) of the second movable contact piece (31b) and the second fixed contact portion (2231b), and the contact position of the movable contact portion (311) of the third movable contact piece (31c) and the third fixed contact portion (2231c) is increased, thereby preventing the arc generated between the first fixed contact portion (2231a) and the first movable contact piece (31a) from contaminating the second fixed contact portion (2231b) and the third fixed contact portion (2231c).

[0165] Referring again to FIG. 7, the relay according to an embodiment of the present application further includes a short-circuit resistant structure (50), the short-circuit resistant structure (50) is configured to form an attractive force in the contact closing direction on at least one movable contact piece (31), and this attractive force can resist the electrical repulsion caused by a short-circuit current between the movable contact piece (31) and the fixed contact (22), thereby preventing the movable contact piece (31) and the fixed contact (22) from springing open. Here, the attractive force on the movable contact piece (31) with a smaller contact gap is smaller than the attractive force on each of the remaining movable contact pieces (31).

[0166] For reference, the suction force on the movable contact piece (31) with a smaller contact gap is smaller than the suction force on each of the remaining movable contact pieces (31), which may include: the suction force on the movable contact piece (31) with a smaller contact gap is 0, and the suction force on the remaining movable contact piece (31) is not 0; or the suction force on each movable contact piece (31) is all greater than 0, and the suction force on the movable contact piece (31) with a smaller contact gap is smaller than the suction force on each of the remaining movable contact pieces (31).

[0167] It should be noted that when there are three or more movable contact pieces (31), the contact gap between one of the movable contact pieces (31) and the fixed contact (22) is the smallest, and the contact gap between the remaining movable contact pieces (31) and the fixed contact (22) may be the same or different. Also, the suction force on the movable contact piece (31) with the smallest contact gap is the smallest, and the suction force on the remaining movable contact pieces (31) may be the same or different.

[0168] Below, the interruption process of the three movable contact pieces (31) is explained in detail, using the example of a case where the number of movable contact pieces (31) is still three, when a limit interruption current and a short-circuit current are applied to each of the three movable contact pieces (31).

[0169] When a limiting current (e.g., 3kA) is applied, the first movable contact (31a), the second movable contact (31b), and the third movable contact (31c) form a parallel circuit, so that a current of 1kA flows through each of the first movable contact (31a), the second movable contact (31b), and the third movable contact (31c). During the interruption process, the second movable contact (31b) and the third movable contact (31c) are interrupted before the first movable contact (31a), so immediately after the second movable contact (31b) and the third movable contact (31c) are interrupted, the first movable contact (31a) is still in contact with the fixed contact (22), and all of the 3kA current flows to the first movable contact (31a). In addition, since the suction force acting on the first movable contact piece (31a) by the short-circuit resistant structure (50) is zero or small, the blocking process of the first movable contact piece (31a) does not need to resist the suction force of the short-circuit resistant structure (50), or the suction force to resist is very small, which is advantageous for blocking the entire relay.

[0170] When a short-circuit current (e.g., 30kA) is applied, the first movable contact (31a), the second movable contact (31b), and the third movable contact (31c) form a parallel circuit, so that a current of 10kA flows through each of the first movable contact (31a), the second movable contact (31b), and the third movable contact (31c). Because the suction force acting on the first movable contact piece (31a) of the short-circuit resistant structure (50) is smaller than the suction force acting on the second movable contact piece (31b) and the third movable contact piece (31c), the first movable contact piece (31a) is springed open by the electrical repulsion between the contacts before the second movable contact piece (31b) and the third movable contact piece (31c), and thus the current in the first movable contact piece (31a) gradually changes from 10kA to 0kA, and as a result, the current in each of the second movable contact piece (31b) and the third movable contact piece (31c) gradually changes from 10kA to 15kA. The current of each of the second movable contact piece (31b) and the third movable contact piece (31c) gradually increases from 10kA to 15kA, and since the increase in current is a gradual process, the electrical repulsion force between the contacts of the second movable contact piece (31b), the third movable contact piece (31c) and the fixed contact (22) also shows a trend of gradually increasing, so that the attractive force acting on the second movable contact piece (31b) and the third movable contact piece (31c) of the short-circuit resistant structure (50) can resist a constant electrical repulsion force, thereby delaying opening and securing a reaction time for the short-circuit interruption of the entire circuit.

[0171] Accordingly, the relay according to the embodiment of the present application is not only advantageous for implementing limit interruption between contacts, but also ensures the reliability of relay operation and extends the lifespan of the product by delaying the opening of the contacts in the event of a short circuit.

[0172] As illustrated in FIG. 14, the short-circuit resistant structure (50) comprises a first magnetic flux inductor (51) and a plurality of second magnetic flux inductors (52), wherein the first magnetic flux inductor (51) is positioned on one side facing the fixed contactor (22) of a plurality of movable contact pieces (31), and there exists a third projection in which the respective orthogonal projections formed on the target plane of the first magnetic flux inductor (51) and each movable contact piece (31) overlap. Each of the plurality of second magnetic flux inductors (52) is fixedly connected to one side opposite the fixed contactor (22) of a plurality of movable contact pieces (31). The second magnetic flux inductor (52) is configured to form a magnetic circuit with the first magnetic flux inductor (51). Here, the thickness of the second magnetic flux inductor (52) connected to the movable contact piece (31) with a smaller contact gap is smaller than the thickness of the second magnetic flux inductor (52) connected to the remaining movable contact piece (31).

[0173] In one embodiment, the thickness of the second magnetic flux inductor (52) corresponding to the first movable contact piece (31a) is smaller than the thickness of the second magnetic flux inductor (52) corresponding to the second movable contact piece (31b) and the third movable contact piece (31c).

[0174] It can be understood that the first magnetic flux inductor (51) and the second magnetic flux inductor (52) may be straight or U-shaped, and that the first magnetic flux inductor (51) and the second magnetic flux inductor (52) may be made of soft magnetic materials such as iron, cobalt, nickel, and alloys thereof.

[0175] Optionally, the first magnetic flux inductor (51) may include a plurality of stacked magnetic flux inductors. It can be understood that the total thickness of the first magnetic flux inductor (51) can be increased by increasing the number of magnetic flux inductors that are relatively thin. Since the magnetic flux inductors are thin, thin strip materials can be used, which lowers material costs and makes the work easier. On the other hand, the number of magnetic flux inductors can be flexibly adjusted according to the magnitude of the short-circuit current.

[0176] In one embodiment, the first magnetic flux inductor (51) is fixedly positioned with respect to the insulating cover (21). For example, the first magnetic flux inductor (51) is connected to the upper wall (213) of the insulating cover (21) through a connecting member (53). In this way, the attractive force of the short-circuit tolerance structure (50) is transmitted to the insulating cover (21), and since the insulating cover (21) is a stationary part, excessive coil holding force is not required, thereby reducing the coil power consumption and volume of the relay and improving the short-circuit tolerance capability.

[0177] Of course, the method by which the first magnetic flux inductor (51) is fixedly positioned with respect to the insulating cover (21) may also be such that the first magnetic flux inductor (51) is fixedly positioned within the insulating cover (21) via a fixed bracket (not shown). Specifically, the fixed bracket is positioned within the insulating cover (21) and fixedly connected to a yoke plate, and the first magnetic flux inductor (51) is fixedly connected to the fixed bracket.

[0178] In addition, in another embodiment, the distance between the first magnetic flux inductor (51) and the second magnetic flux inductor (52) can be designed as a variable distance. Specifically, the distance between the first magnetic flux inductor (51) and the second magnetic flux inductor (52) can be adjusted according to the magnitude of the current value, thereby changing the magnitude of the magnetic attraction force generated between the first magnetic flux inductor (51) and the second magnetic flux inductor (52), so as to satisfy short-circuit resistance while also satisfying the overload cutoff requirement.

[0179] Below, by combining FIGS. 15 to 17, schematic diagrams of a short-circuit resistant structure (50) and a plurality of movable contact pieces (31) of three different embodiments are introduced.

[0180] As illustrated in FIG. 15, the short-circuit resistant structure (50) comprises a first magnetic flux inductor (51) and at least one second magnetic flux inductor (52), wherein the first magnetic flux inductor (51) is positioned on one side facing the fixed contactor (22) of a plurality of movable contact pieces (31), and there exists a third projection in which the respective orthogonal projections formed on the target plane of the first magnetic flux inductor (51) and each movable contact piece (31) overlap. Among the plurality of movable contact pieces (31), the remaining movable contact pieces (31), excluding the movable contact piece (31) with a smaller contact gap, each have one second magnetic flux inductor (52) fixedly connected to one side opposite the fixed contactor (22), and the first magnetic flux inductor (51) is configured to form a magnetic circuit with at least one second magnetic flux inductor (52).

[0181] In one embodiment, the short-circuit resistant structure (50) includes two second magnetic flux inductors (52), and one second magnetic flux inductor (52) is connected to each side opposite the fixed contactor (22) of the second movable contact piece (31b) and the third movable contact piece (31c), and no second magnetic flux inductor (52) is placed on the side opposite the fixed contactor (22) of the first movable contact piece (31a). In this way, the magnitude of the attractive force on the first movable contact piece (31a) can be considered as zero.

[0182] As illustrated in FIG. 16, the short-circuit resistant structure (50) comprises at least one first magnetic flux inductor (51) and at least one second magnetic flux inductor (52), wherein at least one first magnetic flux inductor (51) is positioned on one side facing the fixed contactor (22) of a plurality of movable contact pieces (31); along the contact closing direction, the number and position of at least one first magnetic flux inductor (51) correspond to the number and position of the remaining movable contact pieces (31); wherein, among the plurality of movable contact pieces (31), excluding the movable contact piece (31) with a smaller contact spacing, one second magnetic flux inductor (52) is fixedly connected to each of the remaining movable contact pieces (31) on the opposite side of the fixed contactor (22), and the corresponding first magnetic flux inductor (51) and second magnetic flux inductor (52) are configured to form a magnetic circuit.

[0183] In one embodiment, a first magnetic flux inductor (51) is disposed on each side facing the fixed contactor (22) of the second movable contact piece (31b) and the third movable contact piece (31c), and the first magnetic flux inductor (51) is not disposed on the side facing the fixed contactor (22) of the first movable contact piece (31a). A second magnetic flux inductor (52) is disposed on each side opposite the fixed contactor (22) of the second movable contact piece (31b) and the third movable contact piece (31c), and the second magnetic flux inductor (52) is not disposed on the side opposite the fixed contactor (22) of the first movable contact piece (31a). In this way, the magnitude of the attractive force on the first movable contact piece (31a) can be considered as zero.

[0184] As illustrated in FIG. 17, the short-circuit resistant structure (50) includes at least one first magnetic flux inductor (51), and among the plurality of movable contact pieces (31), the remaining movable contact pieces (31), excluding the movable contact piece (31) with a smaller contact gap, each have one first magnetic flux inductor (51) positioned on one side facing the fixed contact (22).

[0185] In one embodiment, a first magnetic flux inducer (51) is disposed on each side facing the fixed contactor (22) of the second movable contact piece (31b) and the third movable contact piece (31c), and a first magnetic flux inducer (51) is not disposed on the side facing the fixed contactor (22) of the first movable contact piece (31a). In this way, the magnitude of the attractive force on the first movable contact piece (31a) can be considered as zero.

[0186] In summary, the relay according to the embodiment of the present application has at least the following advantages and beneficial effects.

[0187] In a relay according to an embodiment of the present application, each fixed contact (22) and a plurality of movable contact pieces (31) have a plurality of groups of corresponding movable contact parts (311) and fixed contact parts (2231), and each of the fixed contacts (22) and a plurality of movable contact pieces (31) have a first projection in which each of the movable contacts formed on a target plane overlaps with each other, and at least one of the plurality of first projections is arranged to be offset from the remaining first projections in a third direction, so that the arc generation points formed between the plurality of fixed contact parts (2231) and the plurality of movable contact pieces (31) are arranged to be offset in a third direction, thereby increasing the distance between the arc generation points and preventing arcs formed at the plurality of arc generation points from concentrating and influencing each other, which is advantageous for improving arc extinguishing performance.

[0188] Additionally, since the length of the first movable contact piece (31a) is longer and the contact gap between the first movable contact piece (31a) and the fixed contact member (22) is smaller, an arc is generated only at both ends of the longer first movable contact piece (31a), and no arc is generated at the shorter second movable contact piece (31b) and third movable contact piece (31c). When combined with the arrangement method of the permanent magnet (262) of the arc extinguishing part (26), the arc generated at both ends of the first movable contact piece (31a) can be guided to a space where the first movable contact piece (31a) exceeds the second movable contact piece (31b) and the third movable contact piece (31c). The direction of arc guidance is the second movable contact piece (31b), the third movable contact piece (31c), and the second fixed contact part (2231b) and the third fixed contact part corresponding to the second movable contact piece (31b) and the third movable contact piece (31c). By avoiding the contact portion (2231c), the arc prevents high-temperature erosion of the second movable contact piece (31b) and the third movable contact piece (31c).

[0189] In addition, the relay according to the embodiment of the present application further includes a short-circuit resistant structure (50), and when combined with a design in which the contact gap between at least one of the plurality of movable contact pieces (31) and a fixed contact (22) is smaller than the contact gap between the remaining movable contact pieces (31) and a fixed contact (22), it is advantageous for implementing limit interruption between contacts, as well as delaying the opening of the contacts in the event of a short circuit, thereby ensuring the reliability of the relay operation and extending the lifespan of the product.

[0190] In addition, at least one fixed contact portion (2231) of each fixed contact (22) is partially protruded from the outer surface of the connecting portion (222), so that the contact position between the movable contact piece (31) and the fixed contact (22) is brought closer to the insulating cover, that is, the arc generation point is brought closer to the insulating cover, thereby obtaining the effect of rapidly cooling the arc and being advantageous for improving arc extinction performance.

[0191] It will be understood that each embodiment / mode of embodiment provided in this application may be combined with one another without contradiction, and is not exemplified herein.

[0192] In the embodiments of this application, the terms “first,” “second,” and “third” are used for illustrative purposes only and should not be interpreted as indicating or implying relative importance; and unless otherwise explicitly limited, the term “plural” means two or more. Terms such as “mounted,” “interconnected,” “connected,” and “fixed” should be interpreted in a broad sense, for example, “connected” may be fixedly connected, detachably connected, or integrally connected; and “connected” may be directly connected or indirectly connected through an intermediate element. A person skilled in the art to which this application pertains will be able to readily understand the specific meaning of the above terms in the embodiments of this application depending on the specific circumstances.

[0193] In the embodiments of the present application, the directional or positional relationships indicated by terms such as “up,” “down,” “left,” “right,” “front,” “back,” “up,” “bottom,” etc. are directional or positional relationships based on the illustrations in the attached drawings and are intended to easily and briefly explain the embodiments of the present invention. Since the mentioned device or unit must have a specific direction and must be configured and operated in a specific direction, it should not be understood as a limitation on the embodiments of the present application.

[0194] In this specification, terms such as “one embodiment,” “some embodiment,” and “specific embodiment” mean that the specific configuration, structure, material, or feature described in the embodiment or example is included in at least one embodiment or example among the embodiments of this application. Exemplary descriptions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the described specific configuration, structure, material, or feature may be combined in an appropriate manner in any one or more embodiments or examples.

[0195] The embodiments described above merely represent specific embodiments of the present application, and while the description is specific and detailed, it is not intended to limit the scope of the present application. Those skilled in the art may make various modifications and variations without departing from the spirit of the present application, and all of these fall within the scope of protection of the present application. Accordingly, the scope of protection of the present application is limited by the appended claims, and the claims can be interpreted using the description of the invention and the drawings. Explanation of the symbols

[0196] 21-Insulating cover; 211-Mounting hole; 212-Internal space; 213-Top wall; 214-Tubular side wall; 215-First side wall; 216-Second side wall; 22-Fixed contactor; 221-Protrusion; 222-Connecting part; 223-Contact part; 2231-Fixed contact part; 2231a-First fixed contact part; 2231b-Second fixed contact part; 2231c-Third fixed contact part; 2232-Base part; 24-Frame member; 25-Yoke plate; 251-First through hole; 26-Arc extinguishing part; 261-Yoke clamp; 262-Permanent magnet; 262a-First permanent magnet; 262b-Second permanent magnet; 262c-Third permanent magnet; 27-Metal cover; 30-Movable assembly; 31-Movable contact piece; 31a-First movable contact piece; 31b-Second movable contact piece; 31c-Third movable contact piece; 311-Movable contact portion; 32-First elastic member; 33-Push rod member; 40-Magnetic circuit section; 41-Mounted core; 42-Fixed core; 421-Second through hole; 43-Coil bobbin; 44-Coil; 45-Magnetic conduction cylinder; 46-Second elastic member; 47-U-shaped yoke; 471-Bottom yoke; 472-Side yoke; 50-Short-circuit resistant structure; 51-First magnetic flux inductor; 52-Second magnetic flux inductor; 53-Connecting member; D1-1st direction; D2-2nd direction; D3-3rd direction.

Claims

Claim 1 A relay comprising: a pair of fixed contacts arranged along a first direction, wherein each fixed contact comprises a plurality of fixed contact portions; and a plurality of movable contact pieces, wherein each movable contact piece comprises two movable contact portions, and the two movable contact portions are configured to contact the fixed contact portions of the fixed contacts; wherein between each fixed contact and the plurality of movable contact portions, a plurality of groups of corresponding movable contact portions and fixed contact portions have a first projection formed by overlapping each of the respective orthogonal projections formed on a target plane, and at least one of the plurality of first projections is arranged to be offset from the remaining first projections. Claim 2 A relay according to claim 1, characterized in that the orthographic projection on the target plane by a plurality of the movable contact pieces does not have overlapping regions. Claim 3 A relay according to paragraph 2, wherein at least one of the plurality of first projections is positioned offset from the remaining first projections in a third direction; the second direction is defined as the direction of movement of the plurality of movable contact pieces, and any two of the first direction, the second direction, and the third direction are perpendicular to each other, and the target plane is perpendicular to the second direction. Claim 4 A relay according to paragraph 3, wherein each of the above-mentioned movable contact pieces has one above-mentioned movable contact portion formed at each end in the longitudinal direction; and wherein the length of at least one of the above-mentioned movable contact pieces is longer than the length of the remaining above-mentioned movable contact pieces. Claim 5 A relay according to claim 4, characterized in that both ends of the movable contact piece, which is relatively long, protrude from the other movable contact piece in the first direction. Claim 6 A relay according to claim 4, wherein the number of movable contact pieces is three, and the three movable contact pieces are arranged along the third direction; each of the fixed contacts includes three fixed contact portions; and the length of the middle movable contact piece is longer than the length of the remaining two movable contact pieces. Claim 7 A relay according to claim 6, characterized in that the lengths of the remaining two movable contact pieces are the same. Claim 8 A relay according to claim 1, characterized in that the contact gap between at least one of the plurality of movable contact pieces and the fixed contact is smaller than the contact gap between the remaining movable contact pieces and the fixed contact. Claim 9 A relay according to claim 8, wherein each of the above-mentioned movable contact pieces has one above-mentioned contact portion formed at each end in the longitudinal direction; the length of one of the above-mentioned movable contact pieces is longer than the length of the remaining above-mentioned movable contact pieces, and the contact gap between the longer-lengthed movable contact piece and the fixed contact is smaller. Claim 10 A relay according to claim 9, wherein the number of movable contact pieces is three, and the three movable contact pieces are arranged along a third direction; each of the fixed contacts includes three fixed contact portions; and the length of the middle movable contact piece is longer than the length of the remaining two movable contact pieces, and the lengths of the remaining two movable contact pieces are equal to each other. Claim 11 A relay according to claim 8, further comprising a short-circuit tolerance structure configured to form an attractive force in the contact closing direction on at least one of the movable contact pieces—wherein the attractive force on the movable contact piece with a smaller contact gap is smaller than the attractive force on each of the remaining movable contact pieces. Claim 12 A relay according to claim 11, wherein the short-circuit tolerance structure comprises a first magnetic flux inductor and at least one second magnetic flux inductor, wherein the first magnetic flux inductor is disposed on one side facing the fixed contact of a plurality of movable contact pieces; wherein the first magnetic flux inductor and each of the movable contact pieces have a third projection formed by overlapping their respective orthographic projections formed on the target plane; wherein, among the plurality of movable contact pieces, the movable contact piece having a smaller contact gap is excluded from the remaining movable contact pieces, each having one of the second magnetic flux inductors fixedly connected to one side opposite the fixed contact, and wherein the first magnetic flux inductor is configured to form a magnetic circuit with at least one of the second magnetic flux inductors. Claim 13 A relay according to claim 11, wherein the short-circuit tolerance structure comprises at least one first magnetic flux inductor and at least one second magnetic flux inductor, wherein the at least one first magnetic flux inductor is disposed on one side facing the fixed contact of a plurality of movable contact pieces; wherein, along the contact closing direction, the number and position of at least one first magnetic flux inductor correspond to the number and position of the remaining movable contact pieces; wherein, among the plurality of movable contact pieces, the movable contact piece having a smaller contact spacing is excluded, and the remaining movable contact pieces each have one second magnetic flux inductor fixedly connected to one side opposite the fixed contact, and the corresponding first magnetic flux inductor and the second magnetic flux inductor are configured to form a magnetic circuit. Claim 14 A relay according to claim 11, characterized in that the attractive force on the movable contact piece having a smaller contact gap is 0. Claim 15 A relay according to claim 14, wherein the short-circuit tolerance structure comprises at least one first magnetic flux inductor, and the remaining movable contacts, excluding the movable contact with a smaller contact gap among the plurality of movable contacts, each have one of the first magnetic flux inductors disposed on one side facing the fixed contact. Claim 16 A relay according to claim 11, wherein the short-circuit tolerance structure comprises a first magnetic flux inductor and a plurality of second magnetic flux inductors, wherein the first magnetic flux inductor is disposed on one side facing the fixed contact of the plurality of movable contact pieces; wherein the first magnetic flux inductor and each of the movable contact pieces have a third projection formed by the superposition of their respective orthographic projections formed on the target plane; wherein each of the movable contact pieces has one of the second magnetic flux inductors fixedly connected to one side opposite the fixed contact, and the first magnetic flux inductor and the second magnetic flux inductor are configured to form a magnetic circuit; and wherein the thickness of the second magnetic flux inductor corresponding to the movable contact piece having a smaller contact gap is smaller than the thickness of the second magnetic flux inductor corresponding to the remaining movable contact piece. Claim 17 In paragraph 3, the relay further comprises an insulating cover, wherein the insulating cover has an internal space and a pair of mounting holes communicating with the internal space; each of the fixed contacts comprises a protrusion, a connecting part, and a contact part, wherein the protrusion and the contact part are connected through the connecting part, and two of the connecting parts are each inserted and disposed within the pair of mounting holes, wherein the protrusion is located on the outer surface of the insulating cover and connected to the insulating cover; wherein the contact part is located within the internal space and comprises a plurality of fixed contact parts; and wherein at least one of the fixed contact parts in each of the fixed contacts has at least a portion protruding from the outer circumference of the connecting part. Claim 18 A relay according to claim 17, wherein a plurality of fixed contact portions of each of the fixed contacts comprise a first fixed contact portion and a second fixed contact portion; along the first direction, two of the first fixed contact portions of two of the fixed contacts protrude with respect to the outer surface of their respective corresponding connecting portions in a direction in which at least a portion of each portion moves away from each other; and at least a portion of the second fixed contact portion of each of the fixed contacts protrudes with respect to the outer surface of the connecting portion, and the direction of protrusion of the second fixed contact portion and the direction of protrusion of the first fixed contact portion have an interlocking angle. Claim 19 A relay according to claim 18, wherein a first permanent magnet is disposed at a position corresponding to the first fixed contact portion among the outer surfaces of the insulating cover, and a second permanent magnet is disposed at a position corresponding to the second fixed contact portion; wherein the polarity of the surface of the first permanent magnet facing the insulating cover is opposite to the polarity of the surface of the second permanent magnet facing the insulating cover. Claim 20 A relay according to claim 18, wherein at least a portion of the second fixed contact portion protrudes along the third direction relative to the outer surface of the connection portion. Claim 21 A relay according to claim 20, wherein a plurality of fixed contact portions of each of the above fixed contacts further comprise a third fixed contact portion; and wherein, along the third direction, at least a portion of the second fixed contact portion and at least a portion of the third fixed contact portion in each of the above fixed contacts protrude from the outer surface of the connecting portion in a direction away from each other. Claim 22 A relay according to claim 21, wherein, among the outer surfaces of the insulating cover, a first permanent magnet is disposed at a position corresponding to the first fixed contact portion, a second permanent magnet is disposed at a position corresponding to the second fixed contact portion, and a third permanent magnet is disposed at a position corresponding to the third fixed contact portion; and the polarity of the surface of the second permanent magnet facing the insulating cover is the same as the polarity of the surface of the third permanent magnet facing the insulating cover, and opposite to the polarity of the surface of the first permanent magnet facing the insulating cover. Claim 23 A relay according to claim 17, characterized in that the protrusion and the connecting part are an integral structure, and the contact part and the connecting part are a separate structure. Claim 24 A relay according to claim 23, characterized in that the protrusion and the connecting portion are made of a first material, and the contact portion is made of a second material different from the first material. Claim 25 A relay according to claim 17, wherein at least one fixed contact portion in each of the fixed contacts protrudes at least a portion of the outer surface of the protrusion.

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