relay

Abstract

To provide an improved relay.SOLUTION: A contact container includes an insulating cover and a yoke board, the insulating cover is connected to one side face of the yoke board, the insulating cover and the yoke board form a contact chamber, the insulating cover is provided with first through holes, and the first through holes are communicated with the contact chamber. Stationary contact lead-out ends are pierced in the first through holes, and a stationary member is provided in the contact chamber and fixedly connected to the yoke board. A movable member is provided movably in the contact chamber, and the movable member has a movable contactor that is brought into contact with or separated from the pair of stationary contact lead-out ends. A movable body is movably connected to the stationary member, and a first magnetically permeable body is provided in the contact chamber and connected to the movable body. The first magnetically permeable body is provided on a side of the movable contactor directed to the stationary contact lead-out ends. The first magnetically permeable body is movable relative to the movable member via the movable body, and adjusts the distance between the first magnetically permeable body and the movable member according to the magnitude of the value of current flowing in the movable contactor.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Embodiments of the present invention relate to the technical field of electronic control devices, and in particular to relays. [Background technology]

[0002] A relay is an electronic control device that has a control system (also called input circuit) and a controlled system (also called output circuit), and is usually applied in automatic control circuits. A relay is actually an "automatic switch" that controls a large current with a small current. Therefore, in the circuit, it plays roles such as automatic adjustment, safety protection, and conversion circuit.

[0003] High-voltage DC relays are a type of relay. To address the problem of contacts of high-voltage DC relays being flipped off due to the electromotive repulsive force generated by short-circuit current, related art typically employs a short-circuit-resistant ring electromagnetic structure. Depending on the location of the upper magnetic conductor of the short-circuit-resistant ring, these structures can be further divided into a tracking structure and a fixed structure. Specifically, a tracking structure refers to an upper magnetic conductor being located on the moving assembly of the relay, while a fixed structure refers to an upper magnetic conductor being located in a fixed position other than the moving assembly. However, while the fixed structure significantly enhances the short-circuit resistance, it also reduces the interrupting capability due to the negative correlation between short-circuit resistance and interrupting capability. On the other hand, a tracking structure is affected by the holding force of the moving core, so a large short-circuit current may cause the core to break, resulting in contact break. Increasing the holding force of the moving core requires a larger coil, which contradicts the goal of reducing volume and weight. Summary of the Invention

[0004] The embodiments of the present invention provide a relay that combines short-circuit withstand capability with limit breaking capability.

[0005] A relay according to an embodiment of the present invention includes a contact can, a pair of fixed contact leads, a fixed member, a movable member, a moving body, and a first magnetic conductive body; the contact container includes an insulating cover and a yoke plate, the insulating cover is connected to one side of the yoke plate, the insulating cover and the yoke plate form a contact chamber, the insulating cover is provided with a pair of first through holes, each of the first through holes is connected to the contact chamber; The pair of fixed contact lead-out ends are respectively drilled into the pair of first through holes, the fixed member is provided in the contact chamber and fixedly connected to the yoke plate; the movable member is movably provided within the contact chamber, and the movable member has movable contacts that are brought into contact with or separated from the pair of fixed contact lead-out ends; the movable body is movably connected to the fixed member, the first magnetic body is provided in the contact chamber, connected to the moving body, and provided on a side of the movable contactor facing the fixed contact lead-out end, The first magnetic conductive body is movable relative to the movable member via the moving body, and adjusts the distance between the first magnetic conductive body and the movable member depending on the magnitude of the current flowing through the movable contactor.

[0006] According to some embodiments of the present invention, the first magnetic conductive body moves between a first position and a second position via the moving body; In the first position, the distance between the first magnetic body and the movable member is a first interval, and in the second position, the distance between the first magnetic body and the movable member is a second interval, and the first interval is greater than the second interval.

[0007] According to some embodiments of the present invention, in the second position, the second gap between the first magnetic conductive body and the movable member is equal to zero.

[0008] According to some embodiments of the present invention, the first magnetic conductive body is located at the first position, and a value of a current flowing through the movable contact is equal to or less than a threshold current, When the value of the current flowing through the movable contact is greater than the threshold current, the first magnetic conductive body moves from the first position to the second position.

[0009] According to some embodiments of the present invention, the relay further includes a first elastic body; The first elastic body provides an elastic force to the moving body so that the first magnetic conductive body tends to move in a direction away from the movable member.

[0010] According to some embodiments of the present invention, the fixing member has a first side facing the yoke plate and a second side provided on an opposite side to the first side, the first elastic body is provided on the second side, the first magnetic conductive body and the movable member are provided on the first side, and the first magnetic conductive body is provided between the first elastic body and the movable member; One end of the moving body is connected to the first elastic body, and the other end is connected to the first magnetic conductive body.

[0011] According to some embodiments of the present invention, the fixing member has a first perforation extending through the first side surface and the second side surface; The movable body is rod-shaped and is movably provided in the first hole. According to some embodiments of the present invention, the first elastic body has second perforations corresponding to the first perforations, The movable body is provided in the first hole and the second hole.

[0012] According to some embodiments of the present invention, the movable body includes a rod body and a pressing cap provided at one end of the rod body, The pressure cap presses the peripheral edge of the second hole on the side facing the first magnetic conductive body.

[0013] According to some embodiments of the present invention, the first magnetic conductive body is provided with a third perforation corresponding to the positions of the first perforation and the second perforation, and the rod body is perforated with the second perforation, the first perforation, and the third perforation in this order; a step structure is provided on the outer periphery of the rod body, and one end of the rod body facing the movable member is fixedly connected to the first magnetic conductive body; The step structure abuts against the peripheral edge of the third perforation on the side facing the first elastic body.

[0014] According to some embodiments of the present invention, the fixing member includes a fixing body and two connecting bodies, the fixed body is disposed parallel to the yoke plate and has the first side and the second side; One end of each of the two connecting bodies is connected to opposite ends of the fixed body, and the other end of each of the two connecting bodies is connected to one side of the yoke plate facing the fixed contact lead-out end.

[0015] According to some embodiments of the present invention, the fixed body is provided between a pair of the fixed contact lead-out ends.

[0016] According to some embodiments of the present invention, the fixed body is made of a metal material, and the connecting body is made of an insulating material.

[0017] According to some embodiments of the present invention, the first magnetic conductive body and the first elastic body are both provided between the pair of fixed contact lead-out ends.

[0018] According to some embodiments of the present invention, the first elastic body includes a reed or a spring.

[0019] According to some embodiments of the present invention, the direction of movement of the first magnetic conductive body relative to the movable member is along the direction of contact / separation between the movable contact and the fixed contact lead-out end.

[0020] According to some embodiments of the present invention, the movable body is provided movably on a side of the movable member facing the fixed contact pull-out ends, and is positioned between the pair of fixed contact pull-out ends.

[0021] According to some embodiments of the present invention, both the movable part and the fixed member are made of a metal material.

[0022] According to some embodiments of the present invention, the fixing member and the yoke plate form an accommodation space, The movable member and the first magnetic conductive body are both movably disposed within the accommodating space.

[0023] According to some embodiments of the present invention, the movable member further comprises a second magnetic conductive body; The second magnetic conductive body is fixedly connected to the side of the movable contactor facing away from the first magnetic conductive body, and the second magnetic conductive body forms a magnetic circuit together with the first magnetic conductive body.

[0024] An embodiment of the above invention has at least the following advantages or beneficial effects.

[0025] In the relay according to the embodiment of the present invention, on the one hand, the fixed member is connected to the yoke plate and fixed relative to the yoke plate, so that the magnetic attraction force generated between the first magnetic conductive body and the movable member is transferred to the yoke plate, which eliminates the need for excessive coil holding force, reduces the relay's coil power consumption and volume, and improves short-circuit resistance. On the other hand, the connection between the fixed member and the yoke plate is easier to operate than the connection between the fixed member and the insulating cover, and the connection strength of the fixed member can be improved. Furthermore, because the fixed member is connected to the yoke plate rather than the insulating cover, it is possible to avoid drilling holes in the insulating cover, which would destroy the structural strength of the insulating cover, which is advantageous in improving the explosion-resistant capability of the insulating cover. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is an exploded schematic view of a relay according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a perspective schematic view of a relay according to a first embodiment of the present invention, with the housing, electromagnet unit, and arc-extinguishing unit omitted. [Figure 3] FIG. 3 is a schematic plan view of a relay according to a first embodiment of the present invention, with the housing, electromagnet unit, and arc-extinguishing unit omitted. [Figure 4] FIG. 4 shows an exploded schematic view of FIG. [Figure 5] FIG. 5 is a perspective schematic view of the fixing member fixed to the yoke plate. [Figure 6] FIG. 6 shows a cross-sectional view along AA in FIG. 3, with the first magnetic conductive body in the first position. [Figure 7] FIG. 7 shows a cross-sectional view along line BB of FIG. 3, with the first magnetic conductive body in the first position. [Figure 8] FIG. 8 shows an enlarged view of a portion X1 in FIG. [Figure 9] FIG. 9 shows a cross-sectional view along AA in FIG. 3, with the first magnetic conductive body in the second position. [Figure 10] FIG. 10 shows a cross-sectional view along line BB of FIG. 3, with the first magnetic conductive body in the second position. [Figure 11] FIG. 11 shows an enlarged view of a portion X2 in FIG. [Figure 12] FIG. 12 is a schematic diagram showing the first magnetic conductive body, the first elastic body, and the moving body after assembly according to one embodiment of the present invention. [Figure 13] FIG. 13 shows an exploded view of FIG. [Figure 14] FIG. 14 is a schematic diagram showing an assembled state of a first magnetic conductive body, a first elastic body, and a moving body according to another embodiment of the present invention. [Figure 15] FIG. 15 shows an exploded schematic view of FIG. [Figure 16] FIG. 16 is an exploded schematic view of a relay according to a second embodiment of the present invention, with the housing, electromagnet unit, and arc-extinguishing unit omitted. [Figure 17]FIG. 17 is an exploded schematic view of a relay according to a third embodiment of the present invention, with the housing, electromagnet unit, and arc-extinguishing unit omitted. DETAILED DESCRIPTION OF THE INVENTION

[0027] [Explanation of symbols] 10, contact vessel; 101, contact chamber; 102, first through-hole; 11a, insulating cover; 11, ceramic cover; 12, flange member; 13, yoke iron plate; 131, second through hole; 20, fixed contact pullout end; 30, storage space; 40, first magnetic conductive body; 410, magnetic conductive piece; 420, third perforation; 50, push rod assembly; 51, push rod; 52, base; 53, movable member; 54, movable contact; 55, second magnetic conductive body; 56, second elastic body; 57, slide structure; 571, limit portion; 572, limit hole; 60, fixing member; 610, connecting body; 620, fixing body; 621, first side; 622, second side; 623, first perforation; 70, first elastic body; 710, elastic lead; 711, second perforation; 720, spring; 730, pressing piece; 80, moving body; 810, pressing cap; 820, rod body; 821, step structure; 1100, housing; 1110, first case; 1120, second case; 1130, exposure hole; 1200, electromagnet unit; 1210, coil bobbin; 1220, coil; 1230, fixed iron core; 1231; through hole; 1240, movable iron core; 1250, reset member; 1300, arc extinguishing unit; 1310, arc extinguishing magnet; 1320, yoke clamp; 1400, seal unit; 1410, metal cover; P1, first position; P2, second position

[0028] Next, exemplary embodiments will be described in more detail with reference to the drawings. However, the exemplary embodiments may be implemented in various forms and should not be understood as being limited to the embodiments described herein. On the contrary, these embodiments are provided so that the present invention will be comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. Since the same reference numerals in the drawings represent the same or similar structures, detailed descriptions will be omitted.

[0029] 1 , a relay according to an embodiment of the present invention includes a housing 1100, an electromagnet unit 1200, an arc-extinguishing unit 1300, and a seal unit 1400. The seal unit 1400 is disposed within the housing 1100, and the top of the fixed contact lead-out end of the seal unit 1400 is exposed to the outer surface of the housing 1100 through an exposure hole 1130 in the housing 1100. The electromagnet unit 1200 and the arc-extinguishing unit 1300 are both disposed within the housing 1100.

[0030] It is to be understood that the terms "comprises," "having," and any variations thereof in the embodiments of the present invention are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally includes other steps or components inherent to those processes, methods, products, or devices.

[0031] As an example, the housing 1100 includes a first case 1110 and a second case 1120, which are engaged and connected to form a chamber for accommodating the electromagnet unit 1200, the arc-extinguishing unit 1300, and the seal unit 1400.

[0032] The arc-extinguishing unit 1300 is used to extinguish an arc that occurs between the fixed contact lead-out end of the seal unit 1400 and the movable contact.

[0033] As an example, the arc-extinguishing unit 1300 includes two arc-extinguishing magnets 1310. The arc-extinguishing magnets 1310 may be permanent magnets, and each arc-extinguishing magnet 1310 may be substantially rectangular. The two arc-extinguishing magnets 1310 are provided on both sides of the seal unit 1400, facing each other along the longitudinal direction of the movable contact.

[0034] By providing two opposing arc-extinguishing magnets 1310, a magnetic field can be formed around the fixed contact pull-out end and the movable contactor, so that the arc generated between the fixed contact pull-out end and the movable contactor is stretched away from each other by the action of the magnetic field, thereby realizing arc extinction.

[0035] The arc-extinguishing unit 1300 further includes two yoke clamps 1320 positioned corresponding to the positions of the two arc-extinguishing magnets 1310. The two yoke clamps 1320 surround the seal unit 1400 and the two arc-extinguishing magnets 1310. The design in which the yoke clamps 1320 surround the arc-extinguishing magnets 1310 prevents the magnetic field generated by the arc-extinguishing magnets 1310 from diffusing to the outside and affecting the arc-extinguishing effect. The yoke clamps 1320 are made of a soft magnetic material. Examples of soft magnetic materials include, but are not limited to, iron, cobalt, nickel, and alloys thereof.

[0036] As shown in Figures 2 to 4, the seal unit 1400 according to an embodiment of the present invention comprises a contact container 10, a pair of fixed contact pull-out ends 20, a push rod assembly 50, a first magnetic conductive body 40, a movable body 80, a fixed member 60, and a first elastic body 70.

[0037] The contact vessel 10 is a stationary component used to house the contact assembly, and can be understood to be primarily a housing and a device having a chamber, and may also be made up of multiple components connected in a predetermined assembly manner.

[0038] The contact vessel 10 has a contact chamber 101 therein. The contact vessel 10 includes an insulating cover 11a and a yoke plate 13. The insulating cover 11a covers one side of the yoke plate 13, and the insulating cover 11a and the yoke plate 13 form the contact chamber 101.

[0039] The insulating cover 11a includes a ceramic cover 11 and a flange member 12. The ceramic cover 11 is connected to the yoke plate 13 via the flange member 12. The flange member 12 can be formed as a ring-shaped metal part made of an iron-nickel alloy or the like, and one end of the flange member 12 is connected to the edge of the opening of the ceramic cover 11 by laser welding, brazing, resistance welding, adhesive bonding, or the like. The other end of the flange member 12 may also be connected to the yoke plate 13 by laser welding, brazing, resistance welding, adhesive bonding, or the like. The flange member 12 is provided between the ceramic cover 11 and the yoke plate 13, making it easy to connect the ceramic cover 11 and the yoke plate 13.

[0040] The contact vessel 10 also has a pair of first through holes 102, which are connected to the contact chamber 101. The first through holes 102 are for allowing the fixed contact lead-out ends 20 to pass through. In this embodiment of the present invention, the first through holes 102 are formed in the ceramic cover 11.

[0041] The pair of fixed contact lead-out ends 20 are connected to the ceramic cover 11 of the contact container 10, and at least a portion of each fixed contact lead-out end 20 is located within the contact chamber 101. One of the pair of fixed contact lead-out ends 20 serves as a terminal through which current flows in, and the other serves as a terminal through which current flows out.

[0042] The pair of fixed contact lead-out ends 20 are drilled in a one-to-one correspondence with the pair of first through-holes 102 and are connected to the ceramic cover 11 by, for example, welding.

[0043] The bottom of the fixed contact lead-out end 20 functions as a fixed contact, which can be provided integrally with the bottom of the fixed contact lead-out end 20 or provided separately.

[0044] 4 and 6, the push rod assembly 50 is connected to the contact container 10 so as to be movable along the axial direction of the rod. The push rod assembly 50 may include a push rod 51, a base 52, a movable member 53, and a second elastic body 56. The yoke plate 13 has a second through hole 131, which penetrates two opposing side edges of the yoke plate 13 along the thickness direction of the yoke plate 13 and communicates with the contact chamber 101 of the contact vessel 10. The push rod 51 is drilled through the second through hole 131 so as to be movable along the axial direction. A base 52 is provided at one axial end of the push rod 51, and at least a portion of the base 52 is located within the contact chamber 101.

[0045] The movable member 53 is connected to the base 52 so as to be movable along the axial direction of the push rod 51. The movable member 53 includes a movable contact 54 and a second magnetic conductive body 55. The second magnetic conductive body 55 is fixedly connected to the movable contact 54 and is located on the side of the movable contact 54 facing away from the first magnetic conductive body 40. The second magnetic conductive body 55 is used to form a magnetic circuit with the first magnetic conductive body 40. Both ends of the movable contact 54 contact the bottoms of the pair of fixed contact pull-out ends 20 to achieve contact closure. The movable contact 54 includes a movable contact piece and movable contacts provided at both longitudinal ends of the movable contact piece. The movable contacts may protrude beyond the movable contact piece or may be flush with the movable contact piece.

[0046] The movable contacts may be provided integrally or separately at both ends of the movable contact piece.

[0047] The second elastic body 56 is connected to the movable member 53 and the base 52 and applies an elastic force to the movable member 53 to move it toward the fixed contact pull-out end 20 .

[0048] The push rod assembly 50 further includes a slide structure 57 connected to the base 52 and the movable member 53, and the movable member 53 is slidable relative to the base 52 via the slide structure 57. The slide structure 57 includes a fitting limit hole 572 and a limit portion 571. The limit portion 571 extends slidably within the limit hole 572.

[0049] In the embodiment of the present invention, the base 52 is directly connected to the movable member 53 via the slide structure 57, which makes the assembly between the base 52 and the movable member 53 easier. Furthermore, since there are no other components between the movable member 53 and the first magnetic conductive body 40, movement interference between these other components and the first magnetic conductive body 40 is avoided during the over-travel process.

[0050] The limit hole 572 may be a through hole or a blind hole.

[0051] As an example, the base 52 is provided with a limit hole 572, and the movable member 53 is provided with a limit portion 571.

[0052] Of course, in other embodiments, the push rod assembly 50 may have other configurations, not all of which are listed here.

[0053] 1 to 4 and 6, seal unit 1400 also includes metal cover 1410. Metal cover 1410 is connected to the side of yoke plate 13 facing away from insulating cover 11a, and metal cover 1410 covers second through-hole 131 of yoke plate 13. Metal cover 1410 and yoke plate 13 form a chamber that houses fixed core 1230 and movable core 1240 of electromagnet unit 1200.

[0054] The electromagnet unit 1200 includes a coil bobbin 1210, a coil 1220, a fixed core 1230, a movable core 1240, and a reset member 1250. The coil bobbin 1210 is hollow and made of an insulating material. A metal cover 1410 is provided inside the coil bobbin 1210. The coil 1220 surrounds the coil bobbin 1210. The fixed core 1230 is fixedly provided inside the metal cover 1410, and a portion of the fixed core 1230 fits into the second through-hole 131. The fixed core 1230 has a through-hole 1231, which is provided at a position corresponding to the second through-hole 131 and is provided in the push rod 51. The movable iron core 1240 is movably provided within the metal cover 1410 and is provided opposite the fixed iron core 1230. The movable iron core 1240 is connected to the push rod 51 and is attracted to the fixed iron core 1230 when the coil 1220 is energized. The movable iron core 1240 and the push rod 51 can be connected by screwing, caulking, welding, or other methods.

[0055] The reset member 1250 is located inside the metal cover 1410, and is disposed between the fixed iron core 1230 and the movable iron core 1240. The reset member 1250 is used to reset the movable iron core 1240 when the power supply to the coil 1220 is cut off. The reset member 1250 may be a spring, and may be fitted onto the outside of the push rod 51.

[0056] When the coil 1220 is energized, the electromagnet unit 1200 drives the push rod assembly 50 via the push rod 51 to move upward. When the movable member 53 comes into contact with the fixed contact pull-out end 20, the movable member 53 is stopped by the fixed contact pull-out end 20, but the push rod 51 and the base 52 continue to move upward until the overtravel is complete.

[0057] As shown in FIGS. 4 to 6 , the fixed member 60 is disposed within the contact chamber 101, fixedly connected to the yoke plate 13, and fixedly provided relative to the contact vessel 10. The movable body 80 is movably connected to the fixed member 60. The first magnetic conductive body 40 is disposed within the contact chamber 101 and connected to the movable body 80. The first magnetic conductive body 40 is disposed on the side of the movable contactor 54 facing the fixed contact lead-out end 20. The first magnetic conductive body 40 is movable relative to the movable member 53 via the movable body 80, and adjusts the distance between the first magnetic conductive body 40 and the movable member 53 depending on the magnitude of the current flowing through the movable member 53.

[0058] The direction of movement of the first magnetic conductive body 40 relative to the movable member 53 is along the direction in which the movable member 53 and the fixed contact lead-out end 20 come into contact with and separate from each other.

[0059] When both ends of the movable contactor 54 come into contact with the pair of fixed contact lead-out ends 20, the second magnetic conductive body 55, which moves together with the movable contactor 54, approaches or comes into contact with the first magnetic conductive body 40, thereby forming a magnetic circuit surrounding the movable contactor 54 between the first magnetic conductive body 40 and the second magnetic conductive body 55. When a short-circuit current passes through the movable contactor 54, a magnetic attractive force is generated between the first magnetic conductive body 40 and the second magnetic conductive body 55 in the direction of pressure on the contacts. This magnetic attractive force resists the electromotive repulsive force caused by the short-circuit current between the movable contactor 54 and the fixed contact lead-out ends 20, ensuring that the movable contactor 54 and the fixed contact lead-out ends 20 do not pop off.

[0060] Furthermore, the first magnetic conductive body 40 and the second magnetic conductive body 55 are located on both sides of the movable contact 54, respectively. When the movable contact 54 is energized, the magnetic attraction force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is a direct electromagnetic attraction force, which can effectively resist the electromotive repulsive force caused by the short-circuit current between the movable contact 54 and the fixed contact pull-out end 20, thereby effectively improving the short-circuit resistance capability.

[0061] As a result of the above, a magnetic attraction force is generated between the first magnetic body 40 and the second magnetic body 55 along the pressure direction of the contacts, and this magnetic attraction force resists the electric repulsive force caused by the short-circuit current between the movable contact 54 and the fixed contact pull-out end 20, ensuring that the movable contact 54 and the fixed contact pull-out end 20 do not bounce off.

[0062] When the value of the current flowing through the movable contactor 54 is constant, the magnitude of the magnetic attraction force generated between the first magnetic conductive body 40 and the second magnetic conductive body 55 is inversely proportional to the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 of the movable member 53, and the smaller the distance, the greater the magnetic attraction force generated. In order to resist the electromotive repulsive force generated by the short-circuit current and prevent the movable contact 54 and the fixed contact pull-out end 20 from popping off, the distance between the first magnetic body 40 and the second magnetic body 55 needs to be designed to be smaller, which can increase the magnetic attraction force between the first magnetic body 40 and the second magnetic body 55.

[0063] In order to easily realize timely shutoff, the distance between the first magnetic body 40 and the second magnetic body 55 needs to be designed to be larger, which reduces the magnitude of the magnetic attraction force between the first magnetic body 40 and the second magnetic body 55 and prevents the magnetic attraction force from being too large and affecting timely shutoff.

[0064] This shows that if the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is constant, it is not possible to achieve both short-circuit resistance and critical breaking capacity. In an embodiment of the present invention, the first magnetic conductive body 40 is movable relative to the movable member 53 via the movable body 80, and the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is adjusted depending on the magnitude of the current flowing through the movable contactor 54, thereby achieving both short-circuit resistance and limit breaking capability.

[0065] In some embodiments, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is different. For example, if the first magnetic conductive body 40 and the second magnetic conductive body 55 are not parallel to each other, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is different at different positions. In this case, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 refers to the maximum distance between them.

[0066] In the relay according to the embodiment of the present invention, on the one hand, the fixed member 60 is connected to the yoke plate 13 and fixed relative to the yoke plate 13, so that the magnetic attraction force generated between the first magnetic conductive body 40 and the movable member 53 is transferred to the yoke plate 13, thereby eliminating the need for excessive coil holding force, reducing the relay's coil power consumption and volume, and improving short-circuit resistance. On the other hand, the connection between the fixed member 60 and the yoke plate 13 is easier to operate than the connection between the fixed member 60 and the insulating cover, and the connection strength of the fixed member 60 can be improved. Furthermore, because the fixed member 60 is connected to the yoke plate 13 rather than the insulating cover, it is possible to avoid drilling holes in the insulating cover, which would destroy the structural strength of the insulating cover, which is advantageous in improving the explosion-resistant capability of the insulating cover.

[0067] As shown in FIGS. 6 to 11 , the first magnetic conductive body 40 moves between a first position P1 and a second position P2 via a moving body 80. At the first position P1, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is a first interval H1, and at the second position P2, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is a second interval H2, where the first interval H1 is larger than the second interval H2. By configuring the first magnetic conductive body 40 to be movable, the interval between the first magnetic conductive body 40 and the second magnetic conductive body 55 can be adjusted according to the magnitude of the current value. Furthermore, the magnitude of the magnetic attractive force generated between the first magnetic conductive body 40 and the second magnetic conductive body 55 can be changed, thereby achieving both short-circuit current resistance and critical interruption.

[0068] As an example, at the second position P2, the second gap H2 between the first magnetic conductive body 40 and the second magnetic conductive body 55 is equal to zero. That is, at the second position P2, the first magnetic conductive body 40 and the second magnetic conductive body 55 are in contact with each other. This maximizes the magnetic attraction force between the first magnetic conductive body 40 and the second magnetic conductive body 55, thereby improving the short-circuit resistance capability.

[0069] Of course, in other embodiments, the second gap H2 between the first magnetic conductive body 40 and the second magnetic conductive body 55 at the second position P2 may not be equal to zero. That is, at the second position P2, the first magnetic conductive body 40 and the second magnetic conductive body 55 are not in contact with each other, and a gap exists between them.

[0070] The first elastic body 70 supplies an elastic force to the moving body 80 so that the first magnetic conductive body 40 tends to move in a direction away from the movable member 53. In the embodiment of the present invention, the first elastic body 70 provides an elastic force to the moving body 80 so that the first magnetic conductive body 40 tends to move toward the first position P1.

[0071] In the embodiment of the present invention, the limit portion 571 may be provided in the second magnetic conductive body 55, but is not limited to this.

[0072] As an example, the second magnetic conductive body 55 and the movable contact 54 may be fixedly connected by caulking, but the present invention is not limited to this.

[0073] It will be appreciated that both the first magnetic conductor 40 and the second magnetic conductor 55 are made from materials such as iron, cobalt, nickel, and alloys thereof.

[0074] In one embodiment, the first magnetic conductive body 40 may be linear or U-shaped, and the second magnetic conductive body 55 may be linear or U-shaped, but is not limited thereto.

[0075] Hereinafter, with reference to FIGS. 6 to 11, it will be described how the embodiment of the present invention achieves both short-circuit current resistance and critical interruption.

[0076] As shown in FIGS. 6 to 8 , the relay is in a normal operating state, and the current flowing through the movable contact 54 is equal to or less than a threshold current, e.g., less than 2000 A. Because the current is small, the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is also small, and this magnetic attractive force is smaller than the elastic preload force of the first elastic body 70. As a result, the elastic force of the first elastic body 70 offsets the magnetic attractive force acting on the first magnetic conductive body 40, thereby maintaining the first magnetic conductive body 40 at the first position P1. When the first magnetic conductive body 40 is located at the first position P1, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is a first gap H1. For example, the first gap H1 may be 1.5 mm, but is not limited to this.

[0077] It is understood that the above threshold current can be adjusted according to the type of relay, for example, if the maximum breaking current of the relay is large, the threshold current can also be set larger, thereby ensuring that the first magnetic conductive body 40 remains in the first position P1 and does not move to the second position P2 under normal operating conditions of the relay.

[0078] 9 to 11, when the value of the current flowing through the movable contact 54 is greater than the threshold current, for example, when the current is greater than 2000 A, the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is proportional to the magnitude of the current value, and therefore, the greater the current value, the greater the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55. When the magnetic attractive force is greater than the elastic preload of the first elastic body 70, the first magnetic conductive body 40 is attracted by the magnetic attractive force and moves in a direction approaching the second magnetic conductive body 55 (i.e., moves from the first position P1 to the second position P2), thereby reducing the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55. The magnitude of the magnetic distance is inversely proportional to the magnitude of the magnetic attractive force; that is, the smaller the magnetic distance, the greater the magnetic attractive force. When a short-circuit current (much greater than the threshold current) flows, a large magnetic attractive force is generated between the first magnetic conductive body 40 and the second magnetic conductive body 55, compressing the first elastic body 70 and moving the first magnetic conductive body 40 to the second position P2. At this time, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is a second distance H2. The second distance H2 is smaller than the first distance H1, and as the distance H2 decreases, the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 increases. Therefore, the first magnetic conductive body 40 can attract the second magnetic conductive body 55 with a large magnetic attractive force. This magnetic attractive force resists the electromotive repulsive force caused by the short-circuit current, ensuring that the movable contact 54 does not pop off the fixed contact lead-out end 20, thereby achieving short-circuit resistance.

[0079] For this reason, in the relay according to the embodiment of the present invention, the first magnetic conductive body 40 is arranged so as to be movable within the contact container 10 via the movable body 80, and the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 can be adjusted according to the magnitude of the current value. Furthermore, the magnitude of the magnetic attraction force generated between the first magnetic conductive body 40 and the second magnetic conductive body 55 can be changed, thereby satisfying the requirements for overload interruption while satisfying short-circuit resistance.

[0080] When the first magnetic conductive body 40 moves from the first position P1 to the second position P2, the first elastic body 70 is gradually compressed, and the reverse elastic force that the first elastic body 70 exerts on the moving body 80 gradually increases. When the value of the current flowing through the movable contact 54 is greater than the threshold current but has not yet reached the short-circuit current, the gradually increasing reverse elastic force maintains the first magnetic conductive body 40 at an intermediate position between the first position P1 and the second position P2. When the value of the current flowing through the movable contact 54 reaches the short-circuit current, a magnetic attraction force sufficient to overcome the reverse elastic force of the first elastic body 70 is generated between the first magnetic conductive body 40 and the second magnetic conductive body 55, allowing the first magnetic conductive body 40 to continue moving to the second position P2. The first elastic body 70 remains compressed until the first magnetic conductive body 40 reaches the second position P2.

[0081] 4 to 7, fixed member 60 includes fixed body 620 and two connecting bodies 610. Fixed body 620 has a plate-like structure and is arranged parallel to yoke plate 13. One ends of two connecting bodies 610 are respectively connected to opposite ends of fixed body 620, and the other ends of two connecting bodies 610 are respectively connected to one side surface of yoke plate 13 facing fixed contact lead-out end 20.

[0082] In one embodiment, the fixed body 620 is made of a metal material or an insulating material, and the connecting body 610 is made of a metal material or an insulating material.

[0083] Preferably, the fixed body 620 is made of a metal material, and the connecting body 610 is made of an insulating material, so that the insulating performance between the first magnetic conductive body 40 and the yoke plate 13 can be improved. In one embodiment, the fixed body 620 and the two connecting bodies 610 are of an integral structure, but are not limited to this.

[0084] The fixed member 60 and the yoke plate 13 form an accommodation space 30 , and the movable member 53 and the first magnetic conductive body 40 are movably disposed within the accommodation space 30 .

[0085] The fixed body 620 of the fixed member 60 has a first side 621 facing the yoke plate 13 and a second side 622 provided on the opposite side to the first side 621. The first elastic body 70 is provided on the second side 622, the first magnetic conductive body 40 and the movable member 53 are provided on the first side 621, and the first magnetic conductive body 40 is provided between the first elastic body 70 and the movable member 53. One end of the movable body 80 is connected to the first elastic body 70, and the other end is connected to the first magnetic conductive body 40. The first magnetic conductive body 40, the first elastic body 70, and the fixed body 620 are all arranged on the side facing the fixed contact lead-out end 20 of the movable contactor 54.

[0086] When the first magnetic conductive body 40 is at the first position P1, the first magnetic conductive body 40 abuts against the surface of the first side 621 of the fixed body 620. When the first magnetic conductive body 40 is at the second position P2, the first magnetic conductive body 40 is spaced apart from the fixed body 620.

[0087] The shape of the moving body 80 can be various, for example, it may be cylindrical, and one end of the moving body 80 and the first elastic body 70 can be connected by welding, crimping, screwing, adhesive, etc., and the other end of the moving body 80 and the first magnetic conductive body 40 can also be connected by welding, crimping, screwing, adhesive, etc. As a modified example, the shape of the moving body 80 may be an inverted U-shape, with the top of the inverted U-shaped structure connected to the first elastic body 70 and the two sides of the inverted U-shaped structure connected to both sides of the first magnetic conductive body 40, respectively.

[0088] When the movable body 80 has a cylindrical shape, the fixed body 620 of the fixed member 60 has a first perforation 623 penetrating the surface of the first side 621 and the surface of the second side 622. The movable body 80 is movably disposed in the first perforation 623. At the first position P1, the first magnetic conductive body 40 abuts against the surface of the first side 621 of the fixed body 620, and one end of the movable body 80 abuts against the first elastic body 70 so as to apply an elastic preload force to the first elastic body 70.

[0089] On the other hand, since the first magnetic conductive body 40 and the first elastic body 70 are respectively provided on two opposing sides of the fixed body 620, it can be understood that no other parts exist between the first magnetic conductive body 40 and the movable contact 54. As a result, when a large current flows through the movable contact 54, the gap between the first magnetic conductive body 40 and the movable contact 54 can be minimized, and the first magnetic conductive body 40 may even come into contact with the movable contact 54, thereby increasing the magnetic attraction force between the first elastic body 40 and the movable contact 54 and improving the short-circuit resistance capability.

[0090] On the other hand, the first elastic body 70 is disposed on the surface of the second side 622 of the fixed body 620 and is not in direct contact with the first magnetic conductive body 40, and therefore does not affect the magnetic pole face of the first magnetic conductive body 40. In addition, the moving body 80 is movably inserted into the first perforation 623 of the fixed body 620, and one end of the moving body 80 presses the first elastic body 70, and the other end of the moving body 80 is connected to the first magnetic conductive body 40, making the structure more compact and not occupying the internal space of the relay without changing the original structure of the relay. Furthermore, the structure is simple and assembly is easy.

[0091] Furthermore, since the first magnetic conductive body 40 acts directly on the movable body 80, and the movable body 80 is installed in the first perforation 623 of the fixed body 620, the magnetic attraction force generated between the first magnetic conductive body 40 and the movable contact 54 while the first magnetic conductive body 40 is moving is not larger than the force arm of the fulcrum formed by the movable body 80 and the first elastic body 70, and therefore the stress generated is small.

[0092] In this embodiment of the present invention, the number of moving bodies 80 is two, and the number of first perforations 623 of the fixed body 620 corresponds to the number of moving bodies 80, i.e., two. The two moving bodies 80 are movably fitted into the two first perforations 623, respectively. Of course, in other embodiments, the number of moving bodies 80 may be one, three, or another number. The first elastic body 70 has second perforations 711 corresponding to the first perforations 623. The moving bodies 80 are fitted into the first perforations 623 and the second perforations 711.

[0093] The moving body 80 includes a rod body 820 and a pressing cap 810 provided at one end of the rod body 820, and the pressing cap 810 presses the peripheral edge of the second perforation 711 on the side facing away from the first magnetic conductive body 40.

[0094] When the first magnetic conductive body 40 moves from the first position P1 to the second position P2 due to the magnetic attractive force, the pressing cap 810 of the moving body 80 presses the first elastic body 70 to compress it.

[0095] One end of the movable body 80 may be fixedly or movably connected to the first elastic body 70. It is understood that when the first magnetic conductive body 40 moves from the first position P1 to the second position P2, the movable body 80 applies a force to the first elastic body 70 to compress the first elastic body 70.

[0096] 4, the first magnetic conductive body 40 is provided with a third perforation 420 corresponding to the positions of the first perforation 623 and the second perforation 711. A step structure 821 is provided on the outer periphery of the rod main body 820 of the moving body 80, which abuts against the peripheral edge of the third perforation 420 of the first magnetic conductive body 40 on the side facing the first elastic body 70.

[0097] When assembling the movable body 80, the first magnetic conductive body 40, the fixed member 60, and the first elastic body 70, the movable body 80 passes through the second perforation 711 of the first elastic body 70, the first perforation 623 of the fixed member 70, and the third perforation 420 of the first magnetic conductive body 40, in that order. The step structure 821 of the rod main body 820 abuts against the periphery of the third perforation 420. One end of the rod 820 facing the movable member 53 is fixedly connected to the first magnetic conductive body 40 by, for example, crimping. The pressing cap 810 presses against the periphery of the second perforation 711.

[0098] 6, the fixed body 620 of the fixed member 60, the first magnetic conductive body 40, and the first elastic body 70 are all located between the pair of fixed contact pull-out ends 20. As a result, the fixed body 620, the first magnetic conductive body 40, and the first elastic body 70 do not occupy the volume of the relay in the height direction, making the entire relay structure more compact and advantageous for realizing a smaller volume.

[0099] The moving body 80 is movably arranged on the side of the movable member 53 facing the fixed contact drawn-out ends 20 , and the moving body 80 is located between the pair of fixed contact drawn-out ends 20 .

[0100] In one embodiment, the mover 80 is made of a metallic material to improve connection strength.

[0101] In one embodiment, the first elastic body 70 includes a reed or a spring.

[0102] As shown in Figures 12 and 13, the first elastic body 70 may be an elastic reed 710, thereby reducing the space occupied by the elastic reed 710 and providing movement space for the first magnetic conductive body 40.

[0103] The second elastic body 56 may also be an elastic reed, which can reduce the space occupied by the second elastic body 56 and provide the first magnetic conductive body 40 with movement space.

[0104] 14 and 15 , as a modified example, the first elastic body 70 may be a spring 720. One end of the spring 720 abuts against the fixed body 620, and the other end of the spring 720 abuts against a pressing piece 730. One end of the moving body 80 is connected to the pressing piece 730 and is pressed against the other end of the spring 720 by the pressing piece 730, and the other end of the moving body 80 passes through a first perforation 623 of the fixed body 620 and is connected to the first magnetic conductive body 40.

[0105] As shown in Fig. 16, the relay of the second embodiment has a basic structure substantially similar to that of the relay of the first embodiment. Therefore, in the following description of the relay of the second embodiment, the structure already described in the first embodiment will not be repeated. Note that the same reference numerals are used to designate the same components as those in the relay described in the first embodiment. Therefore, the following description of this embodiment will focus on the differences from the relay of the first embodiment.

[0106] In the relay according to the second embodiment of the present invention, the movable member 53 includes a movable contactor 54 but does not include a second magnetic conductive body 55. When both ends of the movable contactor 54 contact the pair of fixed contact lead-out ends 20, a current flows through the movable contactor 54, and a magnetic circuit is formed around the longitudinal periphery of the movable contactor 54, surrounding the movable contactor 54. Due to the presence of the first magnetic conductive body 40, much of the magnetic field in the magnetic circuit is concentrated in the first magnetic conductive body 40, magnetizing the first magnetic conductive body 40, and a magnetic attractive force is generated between the first magnetic conductive body 40 and the movable contactor 54 through which the current flows, in the pressure direction of the contacts. This magnetic attractive force resists the electro-mechanical repulsive force caused by the short-circuit current between the movable contactor 54 and the fixed contact lead-out ends 20, ensuring that the movable contactor 54 and the fixed contact lead-out ends 20 do not pop off.

[0107] In an embodiment of the present invention, the first magnetic conductive body 40 is movable relative to the movable contactor 54 via the movable body 80, and the distance between the first magnetic conductive body 40 and the movable contactor 54 of the movable member 53 is adjusted depending on the magnitude of the current flowing through the movable contactor 54, thereby achieving both short-circuit resistance and limit breaking capability.

[0108] In this embodiment, the movable contact 54 is provided with a limit portion 571 .

[0109] As shown in Fig. 17, the relay of the third embodiment has a basic structure substantially similar to that of the relay of the first embodiment. Therefore, in the following description of the relay of the third embodiment, the structure already described in the first embodiment will not be repeated. Note that the same reference numerals are used to designate the same components as those in the relay described in the first embodiment. Therefore, the following description of this embodiment will focus on the differences from the relay of the first embodiment.

[0110] In the relay according to the third embodiment of the present invention, the first magnetic conductive body 40 includes a plurality of laminated magnetic conductive pieces 410. On the one hand, the magnetic conductive pieces 410 are relatively thin and can be made from thin strip-shaped material, which reduces material costs and makes handling easy. On the other hand, the number of magnetic conductive pieces 410 can be flexibly adjusted according to the magnitude of the short-circuit current, and the thickness of the first magnetic conductive body 40 can be increased or decreased.

[0111] It should be noted that the various examples / embodiments provided by the present invention can be combined with each other without causing any contradiction, and therefore, the description thereof will be omitted here.

[0112] In the embodiments of the invention, the terms "first," "second," "third," "one," and "a pair" are used for descriptive purposes only and are not to be understood to indicate or imply relative importance. The term "plurality" means two or more unless otherwise limited. Terms such as "attached," "contact," "connected," and "fixed" should be understood broadly. For example, "connected" may mean a fixed connection, a detachable connection, or an integral connection. "Contacted" may mean a direct connection or an indirect connection via an intermediate medium. The specific meanings of the above terms in the embodiments of the present invention can be understood by those skilled in the art depending on the specific circumstances.

[0113] In describing the embodiments of the present invention, the orientations or positional relationships indicated by terms such as "upper," "lower," "left," "right," "front," and "rear" are orientations or positional relationships based on the drawings and are intended merely to facilitate the description and simplification of the embodiments of the present invention, and do not indicate or imply that the indicated device or unit must have a particular direction in order to be configured and operate in a particular orientation, and should not be understood as limitations on the embodiments of the invention.

[0114] In the description herein, the terms "one embodiment," "some embodiments," "particular embodiment," etc., mean that the particular feature, structure, material, or characteristic described in connection with this embodiment or example is included in at least one embodiment or example of the invention. In this specification, general references to the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0115] The above are only preferred embodiments of the invention, and are not used to limit the invention, and those skilled in the art can make various modifications and changes to the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the invention shall be included in the protection scope of the invention.

Claims

1. A relay including a contact container, a pair of fixed contact lead-out ends, a fixed member, a movable member, a moving body, and a first magnetic conductive body, the contact container includes an insulating cover and a yoke plate, the insulating cover is connected to one side of the yoke plate, the insulating cover and the yoke plate form a contact chamber, the insulating cover is provided with a pair of first through holes, each of the first through holes is connected to the contact chamber; The pair of fixed contact lead-out ends are respectively drilled into the pair of first through holes, the fixed member is provided in the contact chamber and fixedly connected to the yoke plate; the movable member is movably provided within the contact chamber, and the movable member has movable contacts that are brought into contact with or separated from the pair of fixed contact lead-out ends; the movable body is movably connected to the fixed member, the first magnetic body is provided in the contact chamber, connected to the moving body, and provided on a side of the movable contactor facing the fixed contact lead-out end; the first magnetic conductive body is movable relative to the movable member via the moving body, and adjusts the distance between the first magnetic conductive body and the movable member in accordance with the magnitude of the current flowing through the movable contactor; The relay further includes a first elastic body, the first elastic body provides an elastic force to the moving body so that the first magnetic conductive body tends to move in a direction away from the movable member; One end of the moving body is connected to the first elastic body, and the other end is connected to the first magnetic conductive body. A relay characterized by:

2. The distance between the first magnetic conductive body and the movable member is the maximum distance between the first magnetic conductive body and the movable member.

2. The relay according to claim 1.

3. the first magnetic conductive body moves between a first position and a second position via the moving body; In the first position, the distance between the first magnetic conductive body and the movable member is a first interval, and in the second position, the distance between the first magnetic conductive body and the movable member is a second interval, the first interval being greater than the second interval.

2. The relay according to claim 1.

4. In the second position, the second distance between the first magnetic conductive body and the movable member is equal to zero.

4. The relay according to claim 3.

5. the first magnetic conductive body is located at the first position, and the value of the current flowing through the movable contact is equal to or less than a threshold current; When the value of the current flowing through the movable contact is greater than the threshold current, the first magnetic conductive body moves from the first position to the second position.

4. The relay according to claim 3.

6. the fixing member has a first side facing the yoke plate and a second side provided on the opposite side to the first side, the first elastic body is provided on the second side, the first magnetic conductive body and the movable member are provided on the first side, and the first magnetic conductive body is provided between the first elastic body and the movable member; 2. The relay according to claim 1.

7. the securing member has a first perforation extending through the first side surface and the second side surface; The movable body is rod-shaped and movably inserted into the first hole.

7. The relay according to claim 6.

8. the first elastic body has second perforations corresponding to the first perforations; The moving body is provided in the first perforation and the second perforation.

8. The relay according to claim 7.

9. the movable body includes a rod body and a pressing cap provided at one end of the rod body; The pressing cap presses the peripheral edge of the second hole on the side facing the first magnetic conductive body.

9. The relay according to claim 8.

10. the first magnetic conductive body is provided with a third perforation corresponding to the positions of the first perforation and the second perforation, and the rod body is perforated with the second perforation, the first perforation and the third perforation in sequence; a step structure is provided on the outer periphery of the rod body, and one end of the rod body facing the movable member is fixedly connected to the first magnetic conductive body; The step structure is in contact with the periphery of the third perforation on the side facing the first elastic body.

10. The relay according to claim 9.

11. the fixing member includes a fixing body and two connecting bodies; the fixed body is disposed parallel to the yoke plate and has the first side and the second side; One end of each of the two connecting bodies is connected to opposite ends of the fixed body, and the other end of each of the two connecting bodies is connected to one side surface of the yoke plate facing the fixed contact lead-out end.

7. The relay according to claim 6.

12. The fixed body is provided between the pair of fixed contact lead-out ends.

12. The relay according to claim 11 .

13. The fixed body is made of a metal material, and the connecting body is made of an insulating material.

12. The relay according to claim 11 .

14. The first magnetic conductive body and the first elastic body are both provided between the pair of fixed contact lead-out ends.

2. The relay according to claim 1.

15. The first elastic body includes a reed or a spring.

2. The relay according to claim 1.

16. The direction of movement of the first magnetic body relative to the movable member is along the direction of contact / separation between the movable contact and the fixed contact lead-out end.

2. The relay according to claim 1.

17. The movable body is movably provided on the side of the movable member facing the fixed contact drawn-out ends, and is positioned between the pair of fixed contact drawn-out ends.

2. The relay according to claim 1.

18. The moving body and the fixed member are both made of a metal material.

2. The relay according to claim 1.

19. The fixing member and the yoke plate form an accommodation space, The movable member and the first magnetic conductive body are both movably disposed within the accommodation space.

2. The relay according to claim 1.

20. The movable member further includes a second magnetic conductive body, The second magnetic conductive body is fixedly connected to the side of the movable contactor facing away from the first magnetic conductive body, and the second magnetic conductive body forms a magnetic circuit together with the first magnetic conductive body.

2. The relay according to claim 1.

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