relay

Abstract

To provide a relay that achieves both the short-circuit resistance capacity and ultimate breaking capacity.SOLUTION: A relay comprises an insulating cover, a pair of stationary contact lead-out ends, a stationary member, a movable body, a first magnetically permeable body, and a movable member. The insulating cover has a pair of first through holes communicating with a contact chamber. The stationary contact lead-out ends are pierced in the first through holes. The stationary member is provided in the contact chamber and fixedly connected to the insulating cover. The movable body is provided in the contact chamber and is movably connected to the stationary member. The first magnetically permeable body is provided in the contact chamber and connected to the movable body. The movable member is provided movably in the contact chamber, and has a movable contactor that is brought into contact with or separated from the pair of stationary contact lead-out ends. 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, 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 elements, and in particular to relays. [Background technology]

[0002] A relay is an electronic control element that has a control system (also called an input circuit) and a controlled system (also called an output circuit), and is usually used in automatic control circuits. A relay is actually an "automatic switch" that controls large currents with small currents. Therefore, in circuits, 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 electromotive repulsive force caused by short-circuit current, related technologies typically use short-circuit-resistant ring electromagnetic structures. 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 means that the upper magnetic conductor is located on the moving assembly of the relay, while a fixed structure means that the upper magnetic conductor is located in a fixed position other than the moving assembly. However, while the fixed structure significantly enhances short-circuit resistance, it also reduces interruption capability due to the negative correlation between short-circuit resistance and breaking capability. However, a tracking structure is affected by the holding force of the moving core. Under high short-circuit currents, the core will disengage and the contacts will separate. Increasing the holding force of the moving core requires a larger coil, which contradicts the goal of miniaturization and weight reduction. Summary of the Invention

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

[0005] A relay according to an embodiment of the present invention comprises: an insulating cover having a contact chamber and a pair of first through holes each communicating with the contact chamber; a pair of fixed contact lead ends respectively provided in the pair of first through holes; a fixing member disposed within the contact chamber and fixedly connected to the insulating cover; a movable body provided in the contact chamber and movably connected to the fixed member; a first magnetic conductive body provided in the contact chamber and connected to the movable body; a movable member movably disposed within the contact chamber; the movable member includes a movable contactor configured to contact or move away from the pair of fixed contact lead-out ends, and the first magnetic conductive body is provided on one side of the movable contactor facing the fixed contact lead-out ends; The first magnetic conductive body is movable relative to the movable member via the movable body, and is configured to adjust 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 distance between the first magnetic conductive body and the movable member is the maximum distance among the distances between the first magnetic conductive body and the movable member.

[0007] According to some embodiments of the present invention, the first magnetic conductive body is moved between a first position and a second position via the movable 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, and the first interval is greater than the second interval.

[0008] 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.

[0009] According to some embodiments of the present invention, when the first magnetic conductive body is located at the first position, 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.

[0010] According to some embodiments of the present invention, the relay further comprises a first elastic member; The first elastic member applies an elastic force to the movable body so that the first magnetic conductive body tends to move in a direction away from the movable body.

[0011] According to some embodiments of the present invention, the fixed member has a first side facing the movable member and a second side opposite the first side, the first elastic member 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 member and the movable member; One end of the movable body is connected to the first elastic member, and the other end is connected to the first magnetic conductive body.

[0012] According to some embodiments of the present invention, the fixing member has a first perforation passing through the first surface and the second surface; The movable body is rod-shaped and is movably provided in the first hole.

[0013] According to some embodiments of the present invention, the first elastic member has second perforations corresponding to the first perforations, The movable body is provided in the first hole and the second hole.

[0014] 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, and the pressing cap presses the peripheral edge of one side of the second perforation facing away from the first magnetic conductive body.

[0015] 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 drilled through 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, and the step structure abuts against the peripheral edge of one side of the third perforation facing the first elastic member.

[0016] According to some embodiments of the present invention, the first magnetic conductive body moves between a first position and a second position via the movable body, and at the first position, a distance between the first magnetic conductive body and the movable member is a first interval, and at the second position, a distance between the first magnetic conductive body and the movable member is a second interval, the first interval being greater than the second interval; At the first position, the first magnetic conductive body abuts against the surface on the first side, and one end of the movable body presses against the first elastic member, causing the first elastic member to have an elastic preload force.

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

[0018] According to some embodiments of the invention, the first elastic member comprises 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 movably provided on one side of the movable member facing the fixed contact lead-out ends, and the movable body is located between the pair of fixed contact lead-out ends.

[0021] According to some embodiments of the present invention, the movable body is made of a metallic material.

[0022] According to some embodiments of the present invention, the insulating cover includes a ceramic cover and a flange member, one end of the flange member is connected to an opening edge of the ceramic cover, and the pair of first through holes are opened in the ceramic cover, The fixing member is fixedly connected to the ceramic cover.

[0023] According to some embodiments of the present invention, the fixing member comprises: a rod-shaped connecting portion, one axial end of which is connected to the ceramic cover; and a fixed portion connected to the other axial end of the connecting portion.

[0024] According to some embodiments of the present invention, a third through hole is provided in the ceramic cover, the connection portion is drilled in the third through hole, and one axial end of the connection portion is connected to the periphery of the third through hole.

[0025] According to some embodiments of the invention, the connector is a solid rod.

[0026] According to some embodiments of the present invention, the movable member comprises: The movable contact further includes a second magnetic conductive body that is fixedly connected to the side of the movable contact facing away from the first magnetic conductive body and is used to form a magnetic circuit with the first magnetic conductive body.

[0027] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0028] In a relay according to an embodiment of the present invention, the first magnetic conductive body is movable relative to the movable member via the movable body, and the magnitude of the magnetic attraction force generated between the first magnetic conductive body and the movable member can be adjusted according to the magnitude of the current flowing through the movable contact, thereby satisfying the requirements for short-circuit resistance and overload interruption.

[0029] Furthermore, because the fixed part is connected to the ceramic cover via the connecting part, on the one hand, the short-circuit resistant magnetic attraction force is transmitted to the ceramic cover, eliminating the need for excessive coil holding force, thereby reducing the relay coil's power consumption, miniaturizing the relay, and improving short-circuit resistance. On the other hand, because the fixed part is connected to the ceramic cover, it does not occupy much space within the contact chamber, ensuring space for the arc-extinguishing unit to extinguish and for the push rod assembly to operate. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is an exploded schematic view of a relay according to an embodiment of the present invention; [Figure 2] 1 is a perspective schematic view of a relay according to a first embodiment of the present invention, in which a housing, an electromagnet unit, and an arc-extinguishing unit are omitted. [Figure 3] 1 is a schematic top view of a relay according to a first embodiment of the present invention, in which a housing, an electromagnet unit, and an arc-extinguishing unit are omitted. [Figure 4] An exploded schematic diagram of Figure 2 is shown. [Figure 5] 4 shows a cross-sectional view along AA in FIG. 3, where the first magnetic conductive body is in a first position. [Figure 6] 4 shows a cross-sectional view along BB of FIG. 3, where the first magnetic conductive body is in a first position. [Figure 7] 7 shows an enlarged view of a portion X1 in FIG. 6. [Figure 8] 4 shows a cross-sectional view along AA in FIG. 3, where the first magnetic conductive body is in a second position. [Figure 9] 4 shows a cross-sectional view along line BB of FIG. 3, where the first magnetic conductive body is in a second position. [Figure 10] 10 is a partial enlarged view of the X2 portion of FIG. 9. [Figure 11] 1 is a schematic diagram showing a first magnetic conductive body, a first elastic member, and a movable body after assembly according to an embodiment of the present invention; [Figure 12] An exploded schematic diagram of Figure 11 is shown. [Figure 13] FIG. 10 is a schematic diagram showing a first magnetic conductive body, a first elastic member, and a movable body according to another embodiment of the present invention after assembly. [Figure 14] An exploded schematic diagram of Figure 13 is shown. [Figure 15] 1 is an exploded schematic view of a relay according to a second embodiment of the present invention, in which the housing, the electromagnet unit, and the arc-extinguishing unit are omitted. [Figure 16] 10 is a perspective schematic view of a relay according to a third embodiment of the present invention, in which the housing, the electromagnet unit, and the arc-extinguishing unit are omitted. [Figure 17] 10 is a schematic top view of a relay according to a third embodiment of the present invention, in which the housing, the electromagnet unit, and the arc-extinguishing unit are omitted. [Figure 18] 10 is an exploded schematic view of a relay according to a third embodiment of the present invention, in which the housing, the electromagnet unit, and the arc-extinguishing unit are omitted. [Figure 19] 18 shows a cross-sectional view along CC in FIG. 17, with the first magnetic conductive body in a first position.

[0031] [Explanation of symbols] 10, contact vessel; 101, contact chamber; 102, first through-hole; 103, third through-hole; 11a, insulating cover; 11, ceramic cover; 12, flange member; 13, yoke plate; 131, second through hole; 20, fixed contact lead end; 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 member; 57, slide structure; 571, limit portion; 572, limit hole; 60, fixing member; 610, connecting portion; 611, insert portion; 612, flange; 620, fixing portion; 621, first side; 622, second side; 623, first perforation; 70, first elastic member; 701, avoidance notch; 710, elastic lead; 711, second perforation; 720, spring; 730, pressing piece; 80, movable 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 core; 1231, through hole; 1240, movable 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 DETAILED DESCRIPTION OF THE INVENTION

[0032] 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.

[0033] 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 disposed within the housing 1100.

[0034] It will be understood that the terms "comprises" and "having," and any variations thereof, in 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 that are not listed, or optionally includes other steps or units inherent to such process, method, product, or device.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] The arc-extinguishing unit 1300 further includes two yoke clamps 1320 arranged 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 of the yoke clamps 1320 around the arc-extinguishing magnets 1310 prevents the magnetic field generated by the arc-extinguishing magnets 1310 from diffusing outward 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.

[0040] As shown in Figures 2 to 4, the seal unit 1400 of the embodiment of the present invention includes 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 member 70.

[0041] The contact vessel 10 has therein a contact chamber 101. 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 contact chamber 101 is formed by being surrounded by the insulating cover 11a and the yoke plate 13.

[0042] The contact vessel 10 is a fixed component used to house the contact assembly and can be understood to be a device that is primarily a case with a chamber, or the contact vessel 10 may be made up of multiple components connected in a predetermined assembly manner.

[0043] 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 is connected to the yoke plate 13, and may also be connected by laser welding, brazing, resistance welding, adhesive bonding, or the like. By providing the flange member 12 between the ceramic cover 11 and the yoke plate 13, the connection between the ceramic cover 11 and the yoke plate 13 can be facilitated.

[0044] The contact vessel 10 further 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 open to the ceramic cover 11.

[0045] 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 functions as a current inflow terminal, and the other functions as a current outflow terminal.

[0046] The pair of fixed contact lead-out ends 20 are bored in the pair of first through holes 102 in a one-to-one correspondence, and are connected to the ceramic cover 11 by, for example, welding.

[0047] The bottom of the fixed contact lead-out end 20 serves as the fixed contact, and the fixed contact may be provided integrally with or separately from the bottom of the fixed contact lead-out end 20 .

[0048] 4, the push rod assembly 50 is connected to the contact vessel 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 member 56.

[0049] The yoke plate 13 has a second through hole 131, which penetrates two opposing sides of the yoke plate 13 in the thickness direction of the yoke plate 13 and is connected to the contact chamber 101 of the contact vessel 10. The push rod 51 is drilled in the second through hole 131 so as to be movable in 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.

[0050] 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 has a movable contact 54, and both ends of the movable contact 54 are used to contact the bottoms of the pair of fixed contact pull-out ends 20 to achieve contact closure. The movable contact 54 has a movable contact piece and movable contacts provided on both ends of the movable contact piece in the longitudinal direction. The movable contacts may protrude beyond the movable contact piece or may be flush with the movable contact piece.

[0051] The movable contacts may be provided integrally or separately at both ends of the movable contact piece.

[0052] The second elastic member 56 is connected to the movable member 53 and the base 52 and is used to apply an elastic force to the movable member 53 to move it toward the fixed contact pull-out end 20 .

[0053] 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 limit hole 572 and a limit portion 571 that fit together. The limit portion 571 extends slidably within the limit hole 572.

[0054] In the embodiment of the present invention, the base 52 is directly connected to the movable member 53 via the slide structure 57, which simplifies the assembly between the base 52 and the movable member 53. Furthermore, since there is no other member between the movable member 53 and the first magnetic conductive body 40, movement interference between the other member and the first magnetic conductive body 40 during overtravel is avoided.

[0055] The limit hole 572 may be a through hole or a blind hole (blind hole).

[0056] 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.

[0057] Of course, in other embodiments, the push rod assembly 50 may have other configurations, not all of which are listed here.

[0058] 4 to 6, seal unit 1400 further includes metal cover 1410, which is connected to the side of yoke plate 13 facing away from insulating cover 11a and covers second through-hole 131 on yoke plate 13. Metal cover 1410 and yoke plate 13 are enclosed as a chamber for accommodating fixed iron core 1230 and movable iron core 1240 of electromagnet unit 1200.

[0059] 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 for inserting the push rod 51 therethrough. 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 used to be 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.

[0060] The reset member 1250 is located inside the metal cover 1410, between the fixed iron core 1230 and the movable iron core 1240, and 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.

[0061] When the coil 1220 is energized, the electromagnet unit 1200 drives the push rod assembly 50 through the push rod 51 to move it 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 completed.

[0062] 4 to 6, the first magnetic conductive body 40 is disposed within the contact chamber 101, and is disposed on one side of the movable contactor 54 facing the fixed contact lead-out end 20. The fixed member 60 is fixedly connected to the insulating cover 11a of the contact container 10. The movable body 80 is movably attached 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, and is movable relative to the movable member 53 via the movable body 80.

[0063] The movable member 53 further includes a second magnetic conductive body 55 provided in the contact chamber 101, the second magnetic conductive body 55 is fixedly connected to the movable contactor 54, the second magnetic conductive body 55 is located on the side of the movable contactor 54 facing away from the first magnetic conductive body 40, and the second magnetic conductive body 55 is used to form a magnetic circuit with the first magnetic conductive body 40. In the embodiment of the present invention, the limit portion 571 is provided on the second magnetic conductive body 55, but is not limited thereto.

[0064] As an example, the second magnetic conductive body 55 and the movable contact 54 may be fixedly connected by a rivet, but the present invention is not limited to this.

[0065] It will be appreciated that both the first magnetic conductor 40 and the second magnetic conductor 55 may be made using materials such as iron, cobalt, nickel, and alloys thereof.

[0066] In one embodiment, the first magnetic conductive body 40 may be straight or U-shaped, and the second magnetic conductive body 55 may be straight or U-shaped, but is not limited thereto.

[0067] When both ends of the movable contactor 54 contact 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 contacts 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 can resist 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.

[0068] 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 better resist the electromotive repulsive force caused by the short-circuit current between the movable contact 54 and the fixed contact pull-out end 20, effectively improving the short-circuit resistance capability.

[0069] 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 contact, and this magnetic attraction force can resist 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.

[0070] 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.

[0071] 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, it is necessary to design the distance between the first magnetic body 40 and the second magnetic body 55 to be smaller, thereby increasing the magnetic attraction force between the first magnetic body 40 and the second magnetic body 55.

[0072] In order to facilitate timely disconnection, the distance between the first magnetic body 40 and the second magnetic body 55 needs to be designed to be larger, thereby reducing the magnetic attraction force between the first magnetic body 40 and the second magnetic body 55 and avoiding excessive magnetic attraction force affecting timely disconnection.

[0073] This shows that when the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is a fixed value, it is not possible to achieve both short-circuit resistance and ultimate breaking capability.

[0074] In the embodiments 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 according to the magnitude of the current flowing through the movable contact 54, thereby achieving both short-circuit resistance and ultimate breaking capability. In some embodiments, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 varies. For example, if the first magnetic conductive body 40 and the second magnetic conductive body 55 are not parallel, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 varies 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 the first magnetic conductive body 40 and the second magnetic conductive body 55.

[0075] In an embodiment in which the movable member 53 includes only the movable contactor 54 and does not include the 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 it can be understood that a magnetic conductive circuit is formed around the longitudinal periphery of the movable contactor 54. Due to the presence of the first magnetic conductive body 40, most of the magnetic field of the magnetic conductive circuit is concentrated in the first magnetic conductive body 40, magnetizing it. Thus, a magnetic attractive force along the pressure direction of the contact is generated between the first magnetic conductive body 40 and the movable contactor 54 through which the current flows. This magnetic attractive force can counteract 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 bounce off each other.

[0076] As a result, the first magnetic conductive body 40 can move relative to the movable member 53 via the movable body 80, and the distance between the first magnetic conductive body 40 and the movable member 53 is adjusted depending on the magnitude of the current flowing through the movable contactor 54, thereby similarly achieving both short-circuit resistance and ultimate breaking capabilities.

[0077] As shown in FIGS. 5 to 10 , the first magnetic conductive body 40 moves between a first position P1 and a second position P2 via the movable 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. 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, and the first interval H1 is greater 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. This changes the magnitude of the magnetic attractive force generated between the first magnetic conductive body 40 and the second magnetic conductive body 55, achieving both short-circuit current resistance and ultimate interruption.

[0078] 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. In other words, 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.

[0079] Of course, in other embodiments, the second spacing 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.

[0080] The first elastic member 70 is used to provide an elastic force to the movable body 80 so that the first magnetic conductive body 40 has a tendency to move in a direction away from the movable member 53. In an embodiment of the present invention, the first elastic member 70 is used to provide an elastic force to the movable body 80 so that the first magnetic conductive body 40 has a tendency to move toward the first position P1.

[0081] Hereinafter, with reference to FIGS. 5 to 10, a description will be given of how the embodiment of the present invention achieves both short-circuit current resistance and ultimate breaking capability.

[0082] As shown in FIGS. 5 to 7 , 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 at this time, the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is also small. This magnetic attractive force is smaller than the elastic preload of the first elastic member 70. Therefore, the elastic force of the first elastic member 70 cancels out the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55, 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, this first gap H1 may be 1.5 mm, but is not limited to this.

[0083] It can be understood that the magnitude of the threshold current can be adjusted according to the type of relay, for example, if the maximum interrupting 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.

[0084] 8 to 10, when the value of the current flowing through the movable contact 54 is greater than the threshold current, for example, the current is greater than 2000 A, and the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is proportional to the current value. 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 member 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 gap between the first magnetic conductive body 40 and the second magnetic conductive body 55. Furthermore, because 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 larger magnetic attractive force is generated between the first magnetic body 40 and the second magnetic body 55. This magnetic attractive force compresses the first elastic member 70, allowing the first magnetic body 40 to move to the second position P2. At this time, the distance between the first magnetic body 40 and the second magnetic body 55 is a second distance H2. The second distance H2 is smaller than the first distance H1, and as the distance decreases, the magnetic attractive force between the first magnetic body 40 and the second magnetic body 55 increases. Therefore, the first magnetic body 40 can attract the second magnetic body 55 with this large magnetic attractive force, which can counteract the electromotive repulsive force generated by the short-circuit current and prevent the movable contact 54 and the fixed contact lead-out end 20 from bouncing off, thereby achieving short-circuit resistance.

[0085] As can be seen from the above, in the relay according to the embodiment of the present invention, the first magnetic conductive body 40 is movably arranged 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.In addition, by changing the magnitude of the magnetic attraction force generated between the first magnetic conductive body 40 and the second magnetic conductive body 55, it is possible to satisfy the requirements for short-circuit resistance while also meeting the requirements for overload interruption.

[0086] As the first magnetic conductor 40 moves from the first position P1 to the second position P2, the first elastic member 70 is gradually compressed, and the counter-elastic force that the first elastic member 70 exerts on the movable body 80 gradually increases. When the current value flowing through the movable contact 54 is greater than the threshold current but has not yet reached the short-circuit current, the gradually increasing counter-elastic force holds the first magnetic conductor 40 at an intermediate position between the first position P1 and the second position P2. When the current value flowing through the movable contact 54 reaches the short-circuit current, a larger magnetic attractive force is generated between the first magnetic conductor 40 and the second magnetic conductor 55. This magnetic attractive force is sufficient to overcome the counter-elastic force of the first elastic member 70, so the first magnetic conductor 40 continues to move toward the second position P2 and continues to compress the first elastic member 70 until the first magnetic conductor 40 reaches the second position P2.

[0087] 4 to 6 and 8 again, the fixing member 60 includes two connecting portions 610 and a fixing portion 620, one end of each of the two connecting portions 610 is connected to the contact vessel 10, and the other end of each of the two connecting portions 610 is connected to the fixing portion 620. The fixing portion 620 may have a plate-like structure and is provided parallel to the yoke plate 13.

[0088] The fixed portion 620 of the fixed member 60 has a first side 621 facing the yoke plate 13 and a second side 622 opposite the first side 621. The first elastic member 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 member 70 and the movable member 53. One end of the movable body 80 is connected to the first elastic member 70, and the other end is connected to the first magnetic conductive body 40. The first magnetic conductive body 40, the first elastic member 70, and the fixed member 60 are all located on one side of the movable contactor 54 facing the fixed contact lead-out end 20.

[0089] 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 part 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 part 620.

[0090] In the embodiment of the present invention, a third through-hole 103 is opened in the top wall of the ceramic cover 11 of the contact vessel 10, and the connecting part 610 may be rod-shaped and is drilled through the third through-hole 103. The connection between one end of the connecting part 610 and the ceramic cover can be implemented by various methods, such as welding, crimping, screwing, adhesive, etc. The connection between the other end of the connecting part 610 and the fixing part 620 can also be implemented by various methods, such as welding, crimping, screwing, adhesive, engagement, etc.

[0091] When one end of the connection part 610 is connected to the ceramic cover 11 by welding, by welding the connection part 610 to the top wall of the ceramic cover 11, the metallized layer can be processed only on the periphery of the third through hole 103 on the outer wall surface of the top wall without processing the metallized layer on the inner wall surface of the top wall, which not only makes processing easier but also simplifies the processing procedure.

[0092] One end of the connecting portion 610 can be connected to the outer wall surface of the ceramic cover 11, or to the inner wall surface of the ceramic cover 11, or to both the outer wall surface and the inner wall surface of the ceramic cover 11 at the same time.

[0093] In this embodiment of the present invention, one end of the connecting portion 610 is connected to the periphery of the third through-hole 103 of the ceramic cover 11 .

[0094] Since the fixed part 620 is connected to the ceramic cover 11 via the connecting part 610, on the one hand, the short-circuit resistant magnetic attraction force is transmitted to the ceramic cover 11, eliminating the need for excessive coil holding force, thereby reducing the power consumption of the relay coil, miniaturizing the relay, and improving the short-circuit resistance capability. On the other hand, since the fixed part 60 is connected to the ceramic cover 11, it does not occupy much space within the contact chamber, ensuring the arc-extinguishing space of the arc-extinguishing unit 1300 and the operating space of the push rod assembly 50.

[0095] Furthermore, since the fixing portion 620 is connected to the rod-shaped connecting portion 610, various connection methods such as crimping, laser welding, engagement, and adhesive bonding can be used between the fixing portion 620 and the connecting portion 610, resulting in a wide variety of connection methods.

[0096] As an example, the connecting portion 610 is a solid rod. This allows the connecting portion 610 and the fixing portion 620 to be connected with a rivet to ensure a more secure connection. In addition, a solid rod has high support strength and is resistant to deformation.

[0097] The shape of the movable body 80 can be variously embodied, for example, the movable body 80 may be columnar, and one end of the movable body 80 and the first elastic member 70 may be connected by welding, crimping, screwing, adhesive, etc., and the other end of the movable body 80 and the first magnetic conductive body 40 may be connected by welding, crimping, screwing, adhesive, etc. As a modified example, the shape of the movable body 80 may be an inverted U-shape, with the top of the inverted U-shape connected to the first elastic member 70 and the two side parts of the inverted U-shape connected to both sides of the first magnetic conductive body 40, respectively.

[0098] As an example, the fixed part 620 is suspended from the top wall of the ceramic cover 11 via two connecting parts 610. At the same time, the number of movable bodies 80 may be two, but is not limited to this. The two connecting parts 610 may be connected to the inner wall surface of the top wall of the ceramic cover 11, or may be connected to the outer wall surface of the top wall of the ceramic cover 11.

[0099] When the movable body 80 has a columnar shape, the fixed part 620 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 part 620, and one end of the movable body 80 presses the first elastic member 70, causing the first elastic member 70 to have an elastic preload.

[0100] On the one hand, because the first magnetic conductive body 40 and the first elastic member 70 are respectively provided on two opposing side surfaces of the fixed part 620, there are no other components between the first magnetic conductive body 40 and the movable part 53, so that when a large current flows through the movable contact 54 of the movable part 53, the gap between the first magnetic conductive body 40 and the second magnetic conductive body 55 can be made as small as possible, and the first magnetic conductive body 40 and the second magnetic conductive body 55 may even come into contact with each other, further increasing the magnetic attraction force between the first magnetic conductive body 40 and the second magnetic conductive body 55 and improving the short-circuit resistance capability. On the other hand, because the first elastic member 70 is provided on the surface of the second side 622 of the fixed part 620 and does not directly contact the first magnetic conductive body 40, it does not affect the magnetic pole face of the first magnetic conductive body 40. On the other hand, since the movable body 80 is movably mounted in the first bore 623 of the fixed part 620, one end of the movable body 80 presses the first elastic member 70, and the other end of the movable body 80 is connected to the first magnetic conductive body 40, the structure is more compact, the original structure of the relay is not changed, and the internal space of the relay is not occupied. Furthermore, the structure is simple and assembly is easy. Furthermore, since the first magnetic conductive body 40 acts directly on the movable body 80 and the movable body 80 is mounted in the first bore 623 of the fixed part 620, the magnetic attraction force generated between the first magnetic conductive body 40 and the second magnetic conductive body 55 during movement of the first magnetic conductive body 40 does not have a large force arm relative to the fulcrum formed by the movable body 80 and the first elastic member 70, and therefore the generated stress is relatively small.

[0101] 5, the first elastic member 70 has second perforations 711 corresponding to the first perforations 623. A movable body 80 is provided in the first perforations 623 and the second perforations 711. The movable body 80 includes a rod body 820 and a pressing cap 810. The pressing cap 810 is provided at one end of the rod body 820, and the second perforations 711 press the periphery of one side facing away from the first magnetic conductive body 40.

[0102] 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 movable body 80 presses the first elastic member 70 to compress the first elastic member 70.

[0103] One end of the movable body 80 may be fixedly or movably connected to the first elastic member 70, as long as the movable body 80 can apply force to the first elastic member 70 to compress the first elastic member 70 when the first magnetic conductive body 40 moves from the first position P1 to the second position P2.

[0104] 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 movable body 80, and the step structure 821 is used to abut against the peripheral edge of one side of the third perforation 420 of the first magnetic conductive body 40 facing the first elastic member 70.

[0105] When assembling the movable body 80, the first magnetic conductive body 40, the fixed member 60, and the first elastic member 70, the movable body 80 passes through the second perforation 711 of the first elastic member 70, the first perforation 623 of the fixed member 60, 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 main body 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.

[0106] 5, the fixed portion 620 of the fixed member 60, the first magnetic conductive body 40, and the first elastic member 70 are all located between the pair of fixed contact pull-out ends 20. This means that the fixed portion 620, the first magnetic conductive body 40, and the first elastic member 70 do not occupy the volume of the relay in the height direction, making the entire relay structure more compact and enabling miniaturization.

[0107] The movable body 80 is movably provided on the side of the movable member 53 opposite the fixed contact drawn-out ends 20 , and is positioned between the pair of fixed contact drawn-out ends 20 .

[0108] In one embodiment, both the movable body 80 and the fixed member 60 are made of a metal material to improve connection strength.

[0109] As shown in FIGS. 11 and 12, the first elastic member 70 may be an elastic reed 710, which reduces the space occupied by the elastic reed 710 and provides the first magnetic conductive body 40 with space to move.

[0110] The second elastic member 56 may be an elastic reed, which can also reduce the space occupied by the second elastic member 56 and provide the first magnetic conductive body 40 with space to move.

[0111] The elastic reed 710 has avoidance notches 701 at both ends, and the connecting portion 610 passes through the avoidance notches 701. In the embodiment of the present invention, the first elastic member 70 has avoidance notches 701 at both ends, and the two connecting portions 610 pass through the avoidance notches 701, respectively. By providing the avoidance notches 701 in the first elastic member 70, the connecting portion 610 can pass through the first elastic member 70 and connect to the fixed portion 620, so that the connecting portion 610, the fixed portion 620, the first elastic member 70, and the first magnetic conductive body 40 are more compact after assembly and do not occupy the internal space of the relay.

[0112] Of course, the elastic lead 710 does not have to be provided with the avoidance notch 701, or a hole for passing the connecting portion 610 may be opened in the elastic lead 710.

[0113] The first magnetic conductive body 40 can include multiple laminated magnetic conductive pieces 410. On the one hand, the magnetic conductive pieces 410 are relatively thin and can be made from thin materials, which reduces material costs and makes them easy to handle. 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.

[0114] It will be understood that the second magnetic conductive body 55 may also include a plurality of laminated magnetic conductive pieces 410 .

[0115] Of course, the first magnetic conductive body 40 and the second magnetic conductive body 55 may be integrated without adopting a configuration in which a plurality of magnetic conductive pieces 410 are stacked.

[0116] 13 and 14 , as a modified example, the first elastic member 70 may be a spring 720. One end of the spring 720 abuts against the fixed part 620, and the other end of the spring 720 abuts against a pressing piece 730. One end of the movable 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 movable body 80 passes through a first perforation 623 of the fixed part 620 and is connected to the first magnetic conductive body 40.

[0117] As shown in Fig. 15, the relay of the second embodiment has a basic structure that is substantially the same as 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.

[0118] 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 come into contact with the pair of fixed contact lead-out ends 20, a current flows through the movable contactor 54, forming a magnetic conductive circuit around the movable contactor 54 on the outer periphery in the longitudinal direction of the movable contactor 54. Due to the presence of the first magnetic conductive body 40, most of the magnetic field of the magnetic conductive circuit is concentrated in the first magnetic conductive body 40, magnetizing it. This generates a magnetic attractive force along the pressure direction of the contacts between the first magnetic conductive body 40 and the movable contactor 54 through which the current flows. This magnetic attractive force counters the electro-mechanical repulsive force caused by the short-circuit current between the movable contactor 54 and the fixed contact lead-out ends 20, preventing the movable contactor 54 and the fixed contact lead-out ends 20 from bouncing off.

[0119] 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 according to the magnitude of the current flowing through the movable contactor 54, thereby achieving both short-circuit resistance and ultimate breaking capability.

[0120] As shown in Figures 16 to 19, the relay of the third embodiment has a basic structure that is substantially the same as 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, in the following description of this embodiment, the differences from the relay of the first embodiment will be mainly described.

[0121] In the relay according to the third embodiment of the present invention, the connecting portion 610 includes an inserting portion 611 and a flange 612. The inserting portion 611 is provided in the third through-hole 103 of the ceramic cover 11, and one end of the inserting portion 611 facing the fixed portion 620 is bonded or welded to the fixed portion 620. The flange 612 protrudes from one end of the inserting portion 611 on the side away from the fixed portion 620, and the flange 612 is welded to the periphery of the third through-hole 103 of the ceramic cover 11.

[0122] As an example, the insertion portion 611 has a cylindrical structure, the bottom surface of which is welded to one side surface of the first magnetic conductive body 40 facing away from the fixing portion 620, and the flange 612 is provided at the opening of the cylindrical structure.

[0123] Of course, the insertion portion 611 is not limited to a tubular structure, and may be, for example, cylindrical.

[0124] The movable member 53 of the relay according to the third embodiment of the present invention can also be designed to include the movable contact 54 without including the second magnetic conductive body 55.

[0125] It should be noted that the various embodiments / exemplary 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.

[0126] In the embodiments of the invention, the terms "first," "second," "third," "one," and "a pair" are used for descriptive purposes only and should not 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.

[0127] 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 is required to have a particular orientation or be configured and operate in a particular orientation, and therefore should not be understood as limitations on the embodiments of the invention.

[0128] 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.

[0129] The above is only a preferred embodiment of the invention, and is 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 should be included in the protection scope of the invention.

Claims

1. A relay, an insulating cover having a contact chamber and a pair of first through holes each communicating with the contact chamber; a pair of fixed contact lead ends respectively provided in the pair of first through holes; a fixing member disposed within the contact chamber and fixedly connected to the insulating cover; a movable body provided in the contact chamber and movably connected to the fixed member; a first magnetic conductive body provided in the contact chamber and connected to the movable body; a movable member movably disposed within the contact chamber; the movable member includes a movable contactor configured to contact or move away from the pair of fixed contact lead-out ends, the first magnetic conductive body being provided on one side of the movable contactor facing the fixed contact lead-out ends, the relay further comprises a first elastic member; the first elastic member applies an elastic force to the movable member so that the first magnetic conductive body tends to move in a direction away from the movable member; one end of the movable body is connected to the first elastic member, and the other end is connected to the first magnetic conductive body; The first magnetic conductive body is movable relative to the movable member via the movable body, and is configured to adjust 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. 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 movable 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. When the first magnetic conductive body is located at the first position, 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 body moves from the first position to the second position.

4. The relay according to claim 3.

6. the fixed member has a first side facing the movable member and a second side opposite the first side; The first elastic member 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 member and the movable member.

2. The relay according to claim 1.

7. the fixing member has a first perforation penetrating the first surface and the second surface; The movable body is rod-shaped and movably provided in the first hole.

7. The relay according to claim 6.

8. the first elastic member has second perforations corresponding to the first perforations; The movable 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, and the pressing cap presses a peripheral edge of one side of the second bore 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 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, and the step structure abuts against the periphery of one side of the third bore facing the first elastic member.

10. The relay according to claim 9.

11. the first magnetic conductive body moves between a first position and a second position via the movable body; In the first position, a distance between the first magnetic conductive body and the movable member is a first interval, and in the second position, a distance between the first magnetic conductive body and the movable member is a second interval, the first interval being greater than the second interval; At the first position, the first magnetic conductive body abuts against the surface of the first side, and one end of the movable body presses the first elastic member, causing the first elastic member to have an elastic preload.

7. The relay according to claim 6.

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

2. The relay according to claim 1.

13. The first elastic member includes a reed or a spring.

2. The relay according to claim 1.

14. 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.

2. The relay according to claim 1.

15. The movable body is movably provided on one side of the movable member facing the fixed contact lead-out ends, and the movable body is located between the pair of fixed contact lead-out ends.

2. The relay according to claim 1.

16. The movable body is made of a metal material.

2. The relay according to claim 1.

17. the insulating cover includes a ceramic cover and a flange member, one end of the flange member is connected to an opening edge of the ceramic cover, and the pair of first through holes are opened in the ceramic cover; The fixing member is fixedly connected to the ceramic cover.

2. The relay according to claim 1.

18. The fixing member is a rod-shaped connecting portion, one axial end of which is connected to the ceramic cover; a fixing portion connected to the other axial end of the connecting portion; 18. The relay of claim 17.

19. The ceramic cover is provided with a third through hole, the connecting portion is drilled in the third through hole, and one axial end of the connecting portion is connected to the periphery of the third through hole.

19. The relay of claim 18.

20. The connecting portion is a solid rod 19. The relay of claim 18.

21. The movable member is The movable contact further includes a second magnetic conductive body fixedly connected to the side facing the first magnetic conductive body, the second magnetic conductive body being used to form a magnetic circuit with the first magnetic conductive body.

2. The relay according to claim 1.

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