relay

Abstract

The relay includes a contact receptacle (10), a pair of fixed contact lead-out ends (20), a first magnetic conductive body (40), a movable member (53), and a trip assembly (80), the pair of fixed contact lead-out ends being connected to the contact receptacle, the first magnetic conductive body being movable between a first position and a second position relative to the contact receptacle, the movable member including a movable contact (54) and a second magnetic conductive body (55), the first magnetic conductive body being provided on the side of the movable contact facing the fixed contact lead-out ends, and the second magnetic conductive body being connected to the fixed contact (54). The relay is fixedly connected to the side of the movable contact facing away from the point lead-out end, and in a first position, a distance between the first and second conductive bodies is a first interval, and in a second position, a distance between the first and second conductive bodies is a second interval, the first interval being greater than the second interval, the first conductive body is connected to the contact receptacle via a trip assembly, and the trip assembly is used to release the first conductive body when the magnetic attraction force between the first and second conductive bodies is greater than a threshold. This relay can achieve both short-circuit resistance and limit-breaking capability.

Description

[Technical Field]

[0001] This disclosure claims priority to Chinese patent applications filed on October 12, 2022, with application numbers 202211248732.3 and 202211249134.8, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the field of relay technology, and more particularly to high voltage DC relays. [Background technology]

[0003] A relay is an electronic control device that has a control system (also called an input circuit) and a controlled system (also called an output circuit), and is usually applied to automatic control circuits. A relay is essentially an "auto switch" that controls large currents with small currents. Therefore, it plays roles such as automatic adjustment, safety protection, and conversion circuit in the circuit.

[0004] High-voltage DC relays are a type of relay. To address the problem of contact jumping caused by electromotive repulsive force due to short-circuit current, a short-circuit-resistant ring electromagnetic structure is commonly used in related art. Depending on the location of the upper yoke, they can be further distinguished into a driven structure and a fixed structure. Specifically, a driven structure refers to an upper yoke mounted on the movable assembly of the relay, while a fixed structure refers to an upper yoke mounted on a fixed assembly other than the movable assembly. However, while the fixed structure significantly improves short-circuit resistance, its disconnection capability is weakened due to a negative correlation between short-circuit resistance and disconnection capability. However, driven short-circuit-resistant structures are affected by the holding force of the movable core. A large short-circuit current can cause the core to come loose and break the contacts. Increasing the holding force of the movable core requires a larger coil, which contradicts the design goals of a compact, lightweight design. Summary of the Invention

[0005] The present disclosure provides a relay that combines short-circuit resistance and limit disconnection capability.

[0006] One aspect of the present disclosure is a relay including a contact case, a pair of fixed contact lead-out ends, a first magnetic conductive body, a movable member, and a trip assembly, wherein the contact case has a contact chamber, and the pair of fixed contact lead-out ends are connected to the contact case. Fixed installation And , th The first magnetic conductive body is movably provided in the contact chamber, and its positions relative to the contact container include a first position and a second position. The movable member includes a movable contact and a second magnetic conductive body. Both ends of the movable contact are used to contact or separate the pair of fixed contact lead-out ends. The first magnetic conductive body is provided on the side of the movable contact facing the fixed contact lead-out ends, and the second magnetic conductive body is fixed on the side of the movable contact facing away from the fixed contact lead-out ends. Installation the second magnetic conductive body is used to form a magnetic circuit with the first magnetic conductive body, a distance between the first magnetic conductive body and the second magnetic conductive body is a first interval in the first position, and a distance between the first magnetic conductive body and the second magnetic conductive body is a second interval in the second position, the first interval being greater than the second interval, the first magnetic conductive body is connected to the contact receptacle via the trip assembly, and the trip assembly is used to release the first magnetic conductive body when a magnetic attraction force between the first magnetic conductive body and the second magnetic conductive body is greater than a threshold value.

[0007] According to some embodiments of the present disclosure, the first magnetic conductive body is located at the first position, and a value of a current flowing through the movable contact is smaller than or equal to a threshold current; When the value of the current flowing through the movable contact is greater than the threshold current, the trip assembly releases the first magnetic body so that the first magnetic body is attracted by the magnetic attractive force and moved from the first position to the second position.

[0008] According to some embodiments of the present disclosure, the trip assembly comprises: a first coupling member fixedly installed to the contact vessel; a second coupling member, the second coupling member having positions relative to the first coupling member including a locked position and an unlocked position; In the locked position, the second coupling member and the first coupling member are coupled to each other so as to position the first magnetic body at the first position, and in the released position, the second coupling member and the first coupling member are disengaged from each other so as to move the first magnetic body from the first position to the second position.

[0009] According to some embodiments of the present disclosure, the second coupling member is fixedly connected to the first magnetic conductive body, and the trip assembly further includes a retaining member; The retaining member is at least partially disposed within the contact chamber and is fixedly mounted relative to the contact vessel, and the first coupling member is fixedly connected to the retaining member.

[0010] According to some embodiments of the present disclosure, the first magnetic body is movably connected to the holding member by a limit structure, and the limit structure is used to restrict movement of the first magnetic body from the first position to the second position relative to the holding member.

[0011] According to some embodiments of the present disclosure, the limit structure includes a limit groove and a limit block; the limit groove is provided in one of the first magnetic conductive body and the holding member, the limit groove extends along the moving direction of the movable contact, and the limit groove has a stopper wall at one end of a groove wall adjacent to the second magnetic conductive body, The limit block is provided on the other of the first magnetic body and the holding member, and the limit block is slidably matched with the limit groove, and the stopper wall is stopped by the limit block at the second position.

[0012] According to some embodiments of the present disclosure, in the first position, there is a first gap between the limit block and a groove wall of the limit groove, At the second position, there is a second gap between the limit block and the groove wall of the limit groove, The first gap is smaller than the second gap.

[0013] According to some embodiments of the present disclosure, the contact container further has a pair of first and second through holes, the first and second through holes both communicating with the contact chamber, and the pair of fixed contact lead-out ends are drilled in a one-to-one correspondence with the pair of first through holes; The relay further includes a connecting member, the connecting member being drilled through the second through hole and having a first end and a second end, the first end being connected to the contact container and the second end being connected to the holding member.

[0014] According to some embodiments of the present disclosure, the contact vessel comprises: a yoke plate and an insulating cover, the insulating cover is connected to the yoke plate, and the insulating cover and the yoke plate surround each other to form the contact chamber; The first through hole and the second through hole are opened in the insulating cover, and a first end of the connecting member is connected to an outer wall surface of the insulating cover.

[0015] According to some embodiments of the present disclosure, the insulating cover includes a ceramic cover and a flange member, the ceramic cover includes a top wall and a side wall, one end of the side wall is connected to a periphery of the top wall, and the other end of the side wall is connected to the yoke plate via the flange member, the first through hole and the second through hole are opened in the top wall, and on an outer wall surface of the top wall, a first metallized layer is provided around the periphery of the first through hole, and a second metallized layer is provided around the periphery of the second through hole; The fixed contact lead end is welded to the top wall via the first metallization layer, and the first end of the connecting member is welded to the top wall via the second metallization layer.

[0016] According to some embodiments of the present disclosure, the top wall and the side wall are of one unitary structure; or the top wall and the side wall are of separate structures and are connected by welding.

[0017] According to some embodiments of the present disclosure, the retaining member is spaced apart from an inner wall surface of the top wall.

[0018] According to some embodiments of the present disclosure, the contact vessel comprises: a yoke plate and an insulating cover, the insulating cover is connected to the yoke plate, and the insulating cover and the yoke plate surround each other to form the contact chamber; The relay further includes a fixed frame, the fixed frame being disposed within the contact chamber and fixedly connected to the yoke plate, and the holding member being fixedly connected to the fixed frame.

[0019] According to some embodiments of the present disclosure, the retaining member is located between a pair of the fixed contact lead ends.

[0020] According to some embodiments of the present disclosure, the retaining member is made of a metallic material.

[0021] According to some embodiments of the present disclosure, the second coupling member is fixedly connected to the first magnetic conductive body, The first and second coupling members are connected by magnetism.

[0022] According to some embodiments of the present disclosure, one of the first coupling member and the second coupling member is a permanent magnet and the other is an iron block.

[0023] According to some embodiments of the present disclosure, the second coupling member is fixedly connected to the first magnetic conductive body, The first and second connecting members are connected by a snap.

[0024] According to some embodiments of the present disclosure, one of the first coupling member and the second coupling member includes a clamp post and a protrusion provided on an outer periphery of the clamp post, the other of the first connecting member and the second connecting member includes a clamp sleeve and a clamp groove recessed in an inner peripheral wall of the clamp sleeve, The clamping post is inserted into the clamping sleeve, and the protrusion is connected to the clamping groove.

[0025] According to some embodiments of the present disclosure, the first magnetic conductive body has perforations, the first coupling member includes a guide post, the guide post being drilled into the hole and fixedly installed relative to the contact container; the second coupling member includes an elastic snap ring, and the elastic snap ring is movably fitted over one end of the guide post adjacent to the second magnetic conductive body; In the locked position, the elastic snap ring prevents the first magnetic conductive body from moving relative to the guide post in a direction toward the second magnetic conductive body.

[0026] According to some embodiments of the present disclosure, a stopper structure is further provided between the guide pillar and the first magnetic conductive body, and the stopper structure is used to stop the first magnetic conductive body in the second position when the elastic snap ring is in the released position.

[0027] According to some embodiments of the present disclosure, the stopper structure comprises: a first stopper portion provided on the first magnetic conductive body; a second stopper portion provided on the guide pillar, When the first magnetic conductive body is in the second position, the first stopper portion and the second stopper portion stop each other.

[0028] According to some embodiments of the present disclosure, in the released position, the resilient snap ring disengages from the guide post; or In the release position, the elastic snap ring is interposed between the first magnetic conductive body and the second stopper portion.

[0029] According to some embodiments of the present disclosure, the first magnetic body has a recessed groove on a side facing the second magnetic body, the recessed groove communicating with the perforation, The first magnetic conductive body is in the first position, and one end of the guide post adjacent to the elastic snap ring and the second magnetic conductive body is housed in the recessed groove.

[0030] According to some embodiments of the present disclosure, in the second position, the second spacing between the first magnetic conductive body and the second magnetic conductive body is zero.

[0031] According to some embodiments of the present disclosure, a pair of the fixed contact lead ends are connected to the contact receptacle, and at least a portion of the fixed contact lead ends is located within the contact chamber.

[0032] Another aspect of the present disclosure further provides a relay.

[0033] The relay includes a contact can, a pair of fixed contact leads, a first magnetic conductive body, a movable member, and a trip assembly; The contact container includes a yoke plate and an insulating cover, and the insulating cover is connected to a side of the yoke plate to form a contact chamber; a pair of the fixed contact lead ends connected to the insulating cover, at least a portion of the fixed contact lead ends positioned within the contact chamber; the first magnetic conductive body is movably provided in the contact chamber, and has a first position and a second position relative to the contact vessel, the first magnetic conductive body having a perforation; the movable member includes a movable contact and a second magnetic conductive body, both ends of the movable contact are used to contact or separate the pair of fixed contact pull-out ends, the first magnetic conductive body is provided on the side of the movable contact facing the fixed contact pull-out ends, the second magnetic conductive body is fixedly connected to the side of the movable contact facing away from the fixed contact pull-out ends, the second magnetic conductive body is used to form a magnetic circuit with the first magnetic conductive body, at the first position, the distance between the first magnetic conductive body and the second magnetic conductive body is a first interval, at the second position, the distance between the first magnetic conductive body and the second magnetic conductive body is a second interval, the first interval is larger than the second interval, the trip assembly includes a guide post and an elastic snap ring, the guide post is drilled in the hole and fixedly installed relative to the insulating cover, the elastic snap ring is movably fitted over the guide post, and the position of the elastic snap ring relative to the guide post includes a lock position and an unlock position, and in the lock position, the elastic snap ring prevents the first magnetic conductive body from moving relative to the guide post in a direction toward the second magnetic conductive body so as to position the first magnetic conductive body at the first position; In the released position, the resilient snap ring disengages from the locked position to move the first magnetic conductive body from the first position to the second position.

[0034] According to some embodiments of the present disclosure, the first magnetic body is located at the first position, and the value of the current flowing through the movable contact is smaller than or equal to a threshold current. When the value of the current flowing through the movable contact is larger than the threshold current, the first magnetic body is attracted by the magnetic attraction force between the first magnetic body and the second magnetic body and moved from the first position to the second position.

[0035] According to some embodiments of the present disclosure, a stopper structure is further provided between the guide pillar and the first magnetic conductive body, and the stopper structure is used to stop the first magnetic conductive body in the second position when the elastic snap ring is in the released position.

[0036] According to some embodiments of the present disclosure, the stopper structure includes a first stopper portion provided on the first magnetic body and a second stopper portion provided on the guide pillar, and when the first magnetic body is in the second position, the first stopper portion and the second stopper portion stop each other.

[0037] According to some embodiments of the present disclosure, in the release position, the elastic snap ring is detached from the guide post; or in the release position, the elastic snap ring is interposed between the first magnetic body and the second stopper portion.

[0038] According to some embodiments of the present disclosure, the first magnetic body has a recessed groove on the side facing the second magnetic body, the recessed groove is connected to the perforation, the first magnetic body is in the first position, and one end of the guide pillar adjacent to the elastic snap ring and the second magnetic body is housed in the recessed groove.

[0039] According to some embodiments of the present disclosure, the contact container further has a pair of first through holes and a pair of fourth through holes, the first through holes and the fourth through holes both communicate with the contact chamber, the pair of fixed contact pull-out ends are drilled in one-to-one correspondence with the pair of first through holes, the guide post is drilled in the fourth through hole and includes a third end and a fourth end, the third end is connected to the contact container, and the elastic snap ring is placed over the fourth end.

[0040] According to some embodiments of the present disclosure, the first through hole and the fourth through hole are opened in the insulating cover, and the third end of the guide pole is connected to the insulating cover.

[0041] According to some embodiments of the present disclosure, the insulating cover includes a ceramic cover and a flange member, the ceramic cover includes a top wall and a side wall, one end of the side wall is connected to the periphery of the top wall and the other end of the side wall is connected to the yoke plate via the flange member, the first through hole and the fourth through hole are opened in the top wall, on the outer wall surface of the top wall, a first metallization layer is provided around the periphery of the first through hole and a third metallization layer is provided around the periphery of the fourth through hole, the fixed contact lead end is welded to the top wall via the first metallization layer, and the third end of the guide post is welded to the top wall via the third metallization layer.

[0042] According to some embodiments of the present disclosure, the top wall and the side wall are of one unitary structure; or the top wall and the side wall are of separate structures and are connected by welding.

[0043] According to some embodiments of the present disclosure, the first magnetic conductive body is disposed spaced apart from the inner wall surface of the top wall.

[0044] According to some embodiments of the present disclosure, the third end of the guide post is connected to the contact vessel via a welding lug.

[0045] According to some embodiments of the present disclosure, the relay further includes a fixed frame, the fixed frame being disposed within the contact chamber and fixedly connected to the yoke plate, and the guide pillar being fixedly connected to the fixed frame.

[0046] According to some embodiments of the present disclosure, in the second position, the second spacing between the first magnetic conductive body and the second magnetic conductive body is zero.

[0047] One embodiment of the above disclosure has at least the following advantages or beneficial effects.

[0048] In the relay of the present disclosure, the first magnetic conductive body is movably disposed within the contact chamber so that the gap between the first and second magnetic conductive bodies can be adjusted according to the magnitude of the current and the magnitude of the magnetic attractive force generated between the first and second magnetic conductive bodies can be changed, thereby satisfying the requirements for separation and short-circuit resistance. Meanwhile, the first magnetic conductive body is connected to the contact container via a trip assembly. When the magnetic attractive force between the first and second magnetic conductive bodies is greater than a threshold, the trip assembly releases the first magnetic conductive body to adjust the magnetic gap between the first and second magnetic conductive bodies. The installation of the trip assembly enables a faster movement response speed of the first magnetic conductive body and higher short-circuit resistance sensitivity. [Brief explanation of the drawings]

[0049] [Figure 1] 1 is a schematic perspective view of a relay according to a first embodiment of the present disclosure, in which a case, an electromagnet unit, and an arc-extinguishing unit are omitted. [Figure 2] FIG. 1 is a schematic diagram in which the ceramic cover and flange member are omitted. [Figure 3] FIG. 2 is a schematic top view of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. [Figure 5] An exploded schematic diagram of Figure 1 is shown. [Figure 6] 4 is a cross-sectional view taken along line BB in FIG. 3, showing the ceramic cover and flange member omitted and the first magnetic conductive body in the first position. [Figure 7] FIG. 7 is a partial enlarged view of X1 in FIG. 6. [Figure 8] 4 is a cross-sectional view taken along line BB in FIG. 3, showing the ceramic cover and flange member omitted and the first magnetic conductive body in the second position. [Figure 9] FIG. 9 is a partial enlarged view of Y1 in FIG. 8. [Figure 10] FIG. 3 is a partial enlarged view of Z in FIG. 2. [Figure 11] 10 shows a schematic diagram of a holding member fixedly connected to a fixed frame. [Figure 12]FIG. 10 is a schematic perspective view of a relay according to a second embodiment of the present disclosure, in which the case, the electromagnet unit, the arc-extinguishing unit, the ceramic cover, and the flange member are omitted. [Figure 13] FIG. 12 shows a cross-sectional view of the CC after the ceramic cover and flange member are assembled. [Figure 14] An exploded schematic diagram of Figure 12 is shown. [Figure 15] 13 is a cross-sectional view taken along the line DD in FIG. 12, showing the first magnetic conductive body in a first position. [Figure 16] FIG. 16 is a partial enlarged view of X2 in FIG. [Figure 17] 13 is a cross-sectional view taken along the line DD in FIG. 12, showing the first magnetic conductive body in a second position. [Figure 18] FIG. 18 is a partial enlarged view of Y2 in FIG. [Figure 19] FIG. 10 is a schematic perspective view of a relay according to a third embodiment of the present disclosure, in which the case, the electromagnet unit, the arc-extinguishing unit, the ceramic cover, and the flange member are omitted. [Figure 20] This is a schematic diagram in which the ceramic cover and flange member are omitted from FIG. [Figure 21] FIG. 20 is a schematic top view of FIG. 19. [Figure 22] FIG. 22 is a cross-sectional view of EE in FIG. 21. [Figure 23] FIG. 20 is an exploded schematic view of FIG. 19. [Figure 24] 22 is a cross-sectional view of FF in FIG. 21, omitting the ceramic cover and flange member, and showing the first magnetic conductive body in the first position. [Figure 25] FIG. 25 is a partial enlarged view of X3 in FIG. 24. [Figure 26] 22 is a cross-sectional view of FF in FIG. 21, omitting the ceramic cover and flange member, and showing the first magnetic conductive body in the second position. [Figure 27] FIG. 27 is a partial enlarged view of Y3 in FIG. 26. [Figure 28]FIG. 10 is a schematic perspective view of a relay according to a fourth embodiment of the present disclosure, in which the case, the electromagnet unit, the arc-extinguishing unit, the ceramic cover, and the flange member are omitted. [Figure 29] This is a schematic diagram in which the ceramic cover and flange member are omitted from FIG. [Figure 30] FIG. 29 is a schematic top view of FIG. 28. [Figure 31] An exploded schematic diagram of Figure 28 is shown. [Figure 32] 30, omitting the ceramic cover and flange member and showing the first magnetic conductive body in the first position. FIG. [Figure 33] FIG. 33 is a partial enlarged view of X4 in FIG. 32. [Figure 34] 31 is a cross-sectional view taken along line GG in FIG. 30, showing the ceramic cover and flange member omitted and the first magnetic conductive body in the second position. [Figure 35] FIG. 35 is a partial enlarged view of Y4 in FIG. [Figure 36] 1 shows an exploded schematic view of a relay according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0050] Hereinafter, exemplary embodiments will be described in more detail with reference to the drawings. However, the exemplary embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein. Rather, by providing these embodiments, the present disclosure will be thorough and complete, and the concept of the exemplary embodiments will be comprehensively conveyed to those skilled in the art. Note that the same or similar components in the drawings are designated by the same reference numerals, and detailed descriptions thereof will be omitted.

[0051] As shown in Fig. 36, Fig. 36 shows an exploded schematic view of a relay of the present disclosure. The relay includes a case 1100, an electromagnet unit 1200, an arc-extinguishing unit 1300, and a seal unit 1400. The seal unit 1400 is provided within the case 1100, and the top of the fixed contact lead-out end of the seal unit 1400 is exposed to the outer surface of the case 1100 through an exposure hole 1130 in the case 1100. The electromagnet unit 1200 and the arc-extinguishing unit 1300 are both provided within the case 1100.

[0052] As an example, the case 1100 includes a first case 1110 and a second case 1120, which are connected to each other to form a chamber for accommodating the electromagnet unit 1200, the arc extinguishing unit 1300, and the seal unit 1400.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The arc-extinguishing unit 1300 further includes two yoke clamps 1320, which are 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 of the yoke clamps 1320 surrounding the arc-extinguishing magnets 1310 prevents the magnetic field generated by the arc-extinguishing magnets 1310 from diffusing to the outside, which would affect 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.

[0057] As shown in Figures 1 to 5, Figure 1 is a schematic perspective view of a relay according to a first embodiment of the present disclosure, with the case, electromagnet unit, and arc-extinguishing unit omitted. Figure 2 is a schematic diagram of Figure 1 with the ceramic cover 11 and flange member 12 omitted. Figure 3 is a schematic top view of Figure 1. Figure 4 is a cross-sectional view taken along line AA in Figure 3. Figure 5 is an exploded schematic view of Figure 1.

[0058] The seal unit 1400 of the present disclosure includes a contact receptacle 10 , a pair of fixed contact pull-out ends 20 , a push rod assembly 50 , a first magnetic conductive body 40 , and a trip assembly 80 .

[0059] It should be noted that the terms "comprise" and "have" and any variations thereof in this disclosure are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may, in the alternative, further include steps or units not listed, or may, in the alternative, further include other steps or units inherent to the process, method, product, or apparatus.

[0060] The contact vessel 10 has a contact chamber 101 therein. The contact vessel 10 may include an insulating cover 11a and a yoke plate 13, and the insulating cover 11a may be provided on one side of the yoke plate 13, and the insulating cover 11a and the yoke plate 13 may together surround the contact chamber 101.

[0061] 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 is a metal member having an annular structure, such as an iron-nickel alloy, and one end of the flange member 12 is connected to the periphery of the opening of the ceramic cover 11 by means of, for example, laser welding, brazing, resistance welding, or adhesive bonding. The other end of the flange member 12 may also be connected to the yoke plate 13 by means of, for example, laser welding, brazing, resistance welding, or adhesive bonding. 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.

[0062] The ceramic cover 11 includes a top wall 111 and a side wall 112, one end of the side wall 112 being connected to the periphery of the top wall 111 and the other end of the side wall 112 being connected to the yoke plate 13 via a flange member 12.

[0063] The contact container 10 further has a pair of first and second through holes 102 and 103, both of which communicate with the contact chamber 101. The first through hole 102 is for receiving the fixed contact lead-out end 20, and the second through hole 103 is for receiving the connecting member 30.

[0064] For example, the first through hole 102 and the second through hole 103 are both formed in the top wall 111 of the ceramic cover 11. The second through hole 103 may be located between the two first through holes 102, i.e., the connecting member 30 may be located between a pair of fixed contact lead-out ends 20.

[0065] A pair of fixed contact lead-out ends 20 are connected to 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 terminal through which current flows in, and the other functions as a terminal through which current flows out.

[0066] 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 connected to the top wall 111 of the ceramic cover 11 by, for example, welding.

[0067] The bottom of the fixed contact lead-out end 20 functions as a fixed contact, which may be provided integrally with the bottom of the fixed contact lead-out end 20 or separately.

[0068] The first magnetic conductive body 40 is provided movably within the contact chamber 101, and its positions relative to the contact vessel 10 include a first position P1 and a second position P2. In other words, the first magnetic conductive body 40 is provided within the contact chamber 101, and is movable relative to the contact vessel 10 from the first position P1 to the second position P2.

[0069] The push rod assembly 50 is connected to the contact container 10 so as to be movable along the axial direction of the rod (i.e., the movement direction D1 of the movable contact). The push rod assembly 50 may include a rod portion 51, a base 52, a movable member 53, and an elastic member 56.

[0070] The yoke plate 13 has a third through hole 131, which penetrates two opposing side surfaces 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 rod portion 51 is movably disposed in the third through hole 131 along the axial direction. A base 52 is provided at one axial end of the rod portion 51, and at least a portion of the base 52 is located within the contact chamber 101.

[0071] The movable member 53 is connected to the base 52 so as to be movable along the axial direction of the rod portion 51. The movable member 53 includes a movable contactor 54 and a second magnetic conductive body 55, and both ends of the movable contactor 54 are used to contact or separate from the pair of fixed contact pull-out ends 20. The first magnetic conductive body 40 is provided on the side of the movable contactor 54 facing the fixed contact pull-out ends 20, and the second magnetic conductive body 55 is fixedly connected to the side of the movable contactor 54 facing away from the fixed contact pull-out ends 20. In other words, the movable contactor 54 is located between the first magnetic conductive body 40 and the second magnetic conductive body 55 along the axial direction of the rod portion 51. The first magnetic conductive body 40 and the second magnetic conductive body 55 are used to form a magnetic circuit.

[0072] 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.

[0073] The first magnetic conductive body 40 and the second magnetic conductive body 55 may both be made of materials such as iron, cobalt, nickel, and alloys thereof.

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

[0075] The first magnetic conductive body 40 and the second magnetic conductive body 55 may include a plurality of laminated magnetic conductive pieces.

[0076] Both ends of the movable contact 54 are used to contact the bottoms of the pair of fixed contact pull-out ends 20, thereby realizing contact closure. Both ends of the movable contact 54 in the longitudinal direction D2 can serve as movable contacts. The movable contacts at both ends of the movable contact 54 may protrude into other parts of the movable contact 54 or may be arranged flush with other parts.

[0077] The movable contacts may be provided integrally or separately at both ends of the movable contactor 54 in the longitudinal direction D2.

[0078] The 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 .

[0079] As an example, one end of the elastic member 56 abuts against the base 52, and the other end abuts against the second magnetic conductive body 55 of the movable member 53. Of course, in other embodiments, a through hole may be provided in the second magnetic conductive body 55, and the other end of the elastic member 56 may pass through the through hole of the second magnetic conductive body 55 and abut against the movable contactor 54.

[0080] The first magnetic conductive body 40 is connected to the contact container 10 via a trip assembly 80, which is used to release the first magnetic conductive body 40 when the magnetic attraction force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is greater than a threshold value.

[0081] 5, the push rod assembly 50 further includes a slide structure 57 that is 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 match each other. The limit portion 571 is slidably inserted into the limit hole 572.

[0082] In this embodiment, the base 52 is directly connected to the movable member 53 via the sliding structure 57, which simplifies the assembly between the base 52 and the movable member 53. In addition, since there are no remaining members above the movable member 53, motion interference between the remaining members and the first magnetic conductive body 40 is avoided during the over-travel process.

[0083] The limit hole 572 may be a through hole or a blind hole.

[0084] 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. Furthermore, the second magnetic conductive body 55 is provided with a limit portion 571.

[0085] Of course, in other embodiments, the push rod assembly 50 may have other configurations, which will not be listed here.

[0086] 4, 5, and 36, the seal unit 1400 further includes a metal cover 1410, which is connected to the side of the yoke plate 13 facing away from the insulating cover 11a, and which is provided in the third through-hole 131 in the yoke plate 13. As will be described in detail later, the metal cover 1410 and the yoke plate 13 surround each other to form a chamber for accommodating the fixed iron core 1230 and the movable iron core 1240 of the electromagnet unit 1200.

[0087] 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 installed inside the metal cover 1410, and a portion of the fixed core 1230 is inserted into a third through hole 131. The fixed core 1230 has a bore 1231, which is provided at a position corresponding to the third through hole 131 and is for receiving the rod portion 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 rod portion 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 rod portion 51 may be connected by screws, rivets, welding, or other methods.

[0088] 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 a power outage occurs in the coil 1220. The reset member 1250 may be a spring, or may be provided outside the rod portion 51.

[0089] When the coil 1220 is energized, the movable core 1240 can move the push rod assembly 50 upward via the rod portion 51. 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 rod portion 51 and the base 52 continue to move upward until they achieve overtravel.

[0090] As shown in FIGS. 6 to 9, FIG. 6 is a cross-sectional view taken along line BB in FIG. 3, omitting the ceramic cover and flange member, and showing that the first magnetic conductive body 40 is in a first position P1. FIG. 7 is a partially enlarged view taken along line X1 in FIG. 6. FIG. 8 is a cross-sectional view taken along line BB in FIG. 3, omitting the ceramic cover and flange member, and showing that the first magnetic conductive body 40 is in a second position P2. FIG. 9 is a partially enlarged view taken along line Y1 in FIG. 8. 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.

[0091] In addition, the movable contactor 54 of the present disclosure is arranged between the first magnetic body 40 and the second magnetic body 55, and when both ends of the movable contactor 54 come into contact with a pair of fixed contact pull-out ends 20, a magnetic circuit surrounding the movable contactor 54 is formed between the first magnetic body 40 and the second magnetic body 55, thereby generating a magnetic attraction force along the contact pressure direction between the first magnetic body 40 and the second magnetic body 55, and this magnetic attraction force resists the electric repulsive force caused by the short-circuit current between the movable contactor 54 and the fixed contact pull-out end 20, thereby preventing the movable contactor 54 and the fixed contact pull-out end 20 from bouncing up.

[0092] Furthermore, 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 body 40 and the second magnetic body 55 is inversely proportional to the distance between the first magnetic body 40 and the second magnetic body 55, and the smaller the distance, the greater the magnetic attraction force generated.

[0093] In order to resist the electromotive repulsive force generated by the short-circuit current, the movable contact 54 is prevented from bouncing off the fixed contact pull-out end 20, and the gap between the first magnetic body 40 and the second magnetic body 55 is designed to be small, thereby increasing the magnetic attraction force between the first magnetic body 40 and the second magnetic body 55.

[0094] In order to easily achieve timely separation, it is preferable to design the gap between the first magnetic body 40 and the second magnetic body 55 to be large, thereby reducing the magnitude of the magnetic attraction force between the first magnetic body 40 and the second magnetic body 55 and preventing the magnetic attraction force from being too large and affecting timely separation.

[0095] This shows that if 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 critical disconnection resistance.

[0096] In this embodiment, by installing the first magnetic body 40 in a movable manner, the distance between the first magnetic body 40 and the second magnetic body 55 can be adjusted according to the magnitude of the current value, and the magnitude of the magnetic attraction force generated between the first magnetic body 40 and the second magnetic body 55 can be changed, thereby achieving both short-circuit current resistance and limit separation.

[0097] Specifically, as shown in FIGS. 6 and 7 , when the relay is in a normal operating state, the current flowing through the movable contact 54 is equal to or less than the threshold current, e.g., less than 2000 A. Because the current is small, the magnetic attraction force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is also small, and is equal to or less than the threshold current. The threshold current can be understood as the magnitude of the magnetic attraction force when the first magnetic conductive body 40 moves relative to the contact container 10 due to the trip assembly 80 being released. Because the magnetic attraction force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is less than the threshold current, the coupling force of the trip assembly 80 itself cancels out the magnetic attraction 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 at the first position P1, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is a first distance H1. For example, the first gap H1 may be 1.5 mm, but is not limited to this.

[0098] The magnitude of the threshold current can be adjusted according to different types of relays. For example, if the maximum breaking current of the relay is large, the threshold current can be set large so that the first magnetic conductive body 40 is held at the first position P1 and does not move to the second position P2 in the normal operating state of the relay.

[0099] 8 and 9 , when the current flowing through the movable contact 54 is greater than the threshold current, e.g., 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 current value. 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 threshold, i.e., greater than the coupling force of the trip assembly 80 itself, the trip assembly 80 releases the first magnetic conductive body 40 so that the first magnetic conductive body 40 is attracted by the magnetic attractive force and moves toward the second magnetic conductive body 55 (i.e., moves from the first position P1 to the second position P2). This reduces the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55. The size of the magnetic gap is inversely proportional to the magnetic attractive force. In other words, the smaller the magnetic gap, the greater the magnetic attractive force. When a short-circuit current (much larger than the threshold current) flows, the first magnetic conductive body 40 moves to the second position P2, and 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 becomes smaller, 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, and this magnetic attractive force can resist the electromotive repulsive force generated by the short-circuit current, ensuring that the movable contact 54 does not jump up from the fixed contact lead-out end 20 and achieving short-circuit resistance.

[0100] As described above, according to the relay of the present disclosure, the first magnetic conductive body 40 is movably disposed within the contact chamber 101 so that 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, and 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 satisfying the requirement for short-circuit resistance while being disconnected. Meanwhile, the first magnetic conductive body 40 is connected to the contact container 10 via the trip assembly 80. When the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is greater than a threshold, the trip assembly 80 is caused to release the first magnetic conductive body 40 and adjust the magnetic gap between the first magnetic conductive body 40 and the second magnetic conductive body 55. The installation of the trip assembly 80 provides a faster movement response speed of the first magnetic conductive body 40 and higher short-circuit resistance sensitivity.

[0101] 4 and 5 , the trip assembly 80 includes a first coupling member 810, a second coupling member 820, and a retaining member 42. At least a portion of the retaining member 42 is provided in the contactor chamber 101 and fixedly installed relative to the contactor vessel 10. The first coupling member 810 is fixedly connected to the retaining member 42, and the second coupling member 820 is fixedly connected to the first magnetic conductive body 40. The positions of the second coupling member 820 relative to the first coupling member 810 include a locked position and an unlocked position. Here, in the locked position, the second coupling member 820 is coupled to the first coupling member 810 to position the first magnetic conductive body 40 at the first position P1. In the unlocked position, the second coupling member 820 and the first coupling member 810 are separated from each other to move the first magnetic conductive body 40 from the first position P1 to the second position P2.

[0102] Specifically, the first coupling member 810 and the second coupling member 820 can be connected by their coupling force. When the magnetic attractive force between the first magnetic body 40 and the second magnetic body 55 is equal to or less than a threshold, i.e., equal to or less than the coupling force between the first coupling member 810 and the second coupling member 820, the second coupling member 820 is in a locked position relative to the first coupling member 810, and the first magnetic body 40 cannot move and is located at the first position P1. When the current increases and the magnetic attractive force between the first magnetic body 40 and the second magnetic body 55 exceeds the threshold, i.e., exceeds the coupling force between the first coupling member 810 and the second coupling member 820, the second coupling member 820 is in a released position relative to the first coupling member 810. As the second coupling member 820 disengages from the first coupling member 810, the first magnetic body 40 is attracted by the magnetic attractive force and moves to the second position P2.

[0103] In this embodiment, the first connecting member 810 and the second connecting member 820 are magnetically connected. For example, the magnetic attractive force between the first connecting member 810 and the second connecting member 820 may be 20 N, i.e., the threshold value may be 20 N. When the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is 20 N or less, the first connecting member 810 and the second connecting member 820 still maintain magnetic attraction, and the first magnetic conductive body 40 is at the first position P1. When the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 exceeds 20 N, the second connecting member 820 disengages from the first connecting member 810, and the first magnetic conductive body 40 moves. In the process of the first magnetic conductive body 40 moving from the first position P1 to the second position P2, the distance between the first connecting member 810 and the second connecting member 820 gradually increases, and the magnetic attraction force between the first connecting member 810 and the second connecting member 820 gradually decreases. In this way, the magnetic attraction force between the first connecting member 810 and the second connecting member 820 does not affect the movement of the first magnetic conductive body 40 from the first position P1 to the second position P2, so the movement response speed of the first magnetic conductive body 40 becomes faster and its sensitivity to short circuit resistance becomes higher.

[0104] As an example, one of the first connecting member 810 and the second connecting member 820 is a permanent magnet and the other is an iron block. In detail, the permanent magnet may be fixedly connected to the holding member 42 by, for example, welding, adhesive, etc., and the iron block may be fixedly connected to the first magnetic conductive body 40 by, for example, welding, adhesive, etc. Of course, the permanent magnet may be fixedly connected to the first magnetic conductive body 40, and the iron block may be fixedly connected to the holding member 42.

[0105] Of course, in other embodiments, the first coupling member 810 and the second coupling member 820 may both be permanent magnets, and they may attract each other with opposite polarities.

[0106] 2 and 10, Fig. 10 is a partial enlarged view taken along line Z in Fig. 2. The first magnetic conductive body 40 and the holding member 42 are movably connected by a limit structure 43, and the limit structure 43 is used to limit the movement of the first magnetic conductive body 40 relative to the holding member 42 from a first position P1 to a second position P2.

[0107] The limit structure 43 includes a limit groove 431 and a limit block 432. The limit groove 431 is provided on one of the first magnetic conductive body 40 and the holding member 42, and extends along the movement direction D1 of the movable contact 54. The limit block 432 is provided on the other of the first magnetic conductive body 40 and the holding member 42, and the limit block 432 slidably matches with the limit groove 431.

[0108] In this embodiment, the limit groove 431 is formed in the holding member 42. The limit block 432 is formed in the first magnetic conductive body 40, and more specifically, the limit block 432 is provided in a protruding manner on the side surface of the first magnetic conductive body 40.

[0109] Of course, in other embodiments, the limit groove 431 may be formed in the first magnetic conductive body 40, and the limit block 432 may be formed in the holding member 42.

[0110] At the first position P1, the first magnetic conductive body 40 has a first gap between the limit block 432 and the groove wall of the limit groove 431. At the second position P2, the first magnetic conductive body 40 has a second gap between the limit block 432 and the groove wall of the limit groove 431. The first gap is smaller than the second gap.

[0111] Since the first gap is smaller than the second gap, the dimensions of the limit groove 431 have a structure in which one end is larger and the other end is smaller. Therefore, when the first magnetic conductive body 40 moves from the first position P1 to the second position P2, the gap between the limit block 432 and the groove wall of the limit groove 431 becomes larger, preventing frictional snagging between the limit block 432 and the groove wall of the limit groove 431.

[0112] 8 and 9, the limit groove 431 has a stopper wall 433 at one end of the groove wall adjacent to the second magnetic conductive body 55. When the first magnetic conductive body 40 moves to the second position P2, the stopper wall 433 is stopped by the limit block 432. At this time, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is the second gap H2, and the stopper wall 433 is stopped by the limit block 432, so that the first magnetic conductive body 40 is fixed to the contact vessel 10, thereby providing a stable and reliable magnetic attraction force to the second magnetic conductive body 55 and satisfying the requirement for short-circuit resistance.

[0113] When the first magnetic conductive body 40 moves to the second position P2, i.e., when the stopper wall 433 is stopped by the limit block 432, the first magnetic conductive body 40 and the second magnetic conductive body 55 may be in close contact with each other or may be spaced apart from each other. When the first magnetic conductive body 40 and the second magnetic conductive body 55 are in close contact with each other, the second gap H2 can be considered to be equal to zero.

[0114] As shown in Figures 6 and 7, when the first magnetic body 40 is located at the first position P1, the magnetic attraction force between the first connecting member 810 and the second connecting member 820 causes the first magnetic body 40 to abut against the holding member 42, the limit block 432 is positioned away from the limit wall 434 of the limit groove 431, and the first magnetic body 40 is stably held by the holding member 42.

[0115] Of course, in other embodiments, the manner in which the first magnetic body 40 is held by the holding member 42 may be such that the limit block 432 abuts against the limit wall 434 opposite the stopper wall 433 in the limit groove 431 due to the magnetic attraction force between the first connecting member 810 and the second connecting member 820.

[0116] As shown in Figures 5, 6 and 8, the relay further includes a connecting member 30, which is drilled through the second through-hole 103 and includes a first end 31 and a second end 32, with the first end 31 connected to the contact container 10 and the second end 32 connected to the holding member 42.

[0117] A second through-hole 103 is opened in the contact vessel 10, and the connecting member 30 is drilled through the second through-hole 103, connecting the connecting member 30 to the contact vessel 10, and the holding member 42 is connected to the connecting member 30. The first magnetic conductive body 40 is mounted on the holding member 42 fixed to the contact vessel 10 by the connecting member 30, and the holding force of the first magnetic conductive body 40 is provided by the contact vessel 10, thereby effectively improving the upper limit of the short-circuit withstanding carrier current capability and ensuring the reliability of the short-circuit withstanding. Because the holding member 42 is connected to the contact vessel 10 via the connecting member 30 and not directly connected to the contact vessel 10, the connection process is unobstructed and visible, making operation convenient and ensuring the reliability of the connection.

[0118] Furthermore, the first through-hole 102 and the second through-hole 103 are both opened in the top wall 111 of the ceramic cover 11 , and the first end 31 of the connecting member 30 is connected to the outer wall surface of the top wall 111 .

[0119] On the outer wall surface of the top wall 111, a first metallization layer 113 is provided around the periphery of the first through hole 102, and a second metallization layer 114 is provided around the periphery of the second through hole 103. The fixed contact lead-out end 20 is welded to the top wall 111 via the first metallization layer 113, and the first end 31 of the connecting member 30 is welded to the top wall 111 via the second metallization layer 114.

[0120] It is easier to form a flat weld plane on the outer wall surface of the top wall 111 of the ceramic cover 11 than on the inner wall surface of the ceramic cover 11. Furthermore, the fixed contact lead end 20 needs to be provided on the top wall 111 of the ceramic cover 11. However, if the fixed contact lead end 20 is to be welded to the top wall 111, a metallized layer needs to be provided around the periphery of the first through hole 102. Therefore, when processing the first metallized layer 113 of the first through hole 102, the second metallized layer 114 of the second through hole 103 is also processed. Therefore, by welding the connecting member 30 to the outer wall surface of the top wall 111 of the ceramic cover 11, a metallized layer can be processed on the outer wall surface of the top wall 111, eliminating the need to process a metallized layer on the inner wall surface of the top wall 111, which facilitates processing and simplifies the processing steps.

[0121] Retaining member 42 is installed at a distance from the inner wall surface of top wall 111. By installing retaining member 42 at a distance from the inner wall surface of top wall 111, a gap is formed between retaining member 42 and the inner wall surface of top wall 111. Because retaining member 42 does not directly contact the inner wall surface of top wall 111, the installation of retaining member 42 does not affect the creepage distance between the pair of fixed contact lead-out ends 20.

[0122] In one embodiment, the top wall 111 and the side wall 112 are separate structures and are connected by welding.

[0123] Furthermore, the ceramic cover 11 is designed to have a separate structure with the top wall 111 and the side wall 112, which makes it easier to connect the connecting member 30 to the top wall 111. Of course, the top wall 111 and the side wall 112 may be glued together.

[0124] Specifically, because the top wall 111 is sheet-shaped, the sheet-shaped structure makes it easy to process the first through-hole 102, the second through-hole 103, the first metallization layer 113, and the second metallization layer 114 on the top wall 111. Furthermore, the sheet-shaped structure makes it easy to weld the connecting member 30 to the top wall 111 and the fixed contact lead-out end 20 to the top wall 111.

[0125] The second end 32 of the connecting member 30 and the holding member 42 may be connected in various ways, such as by welding, riveting, or adhesive.

[0126] Of course, in other embodiments, the top wall 111 and the side wall 112 may be of unitary construction.

[0127] 11, which is a schematic diagram showing the holding member 42 fixedly connected to the fixed frame 70. The holding member 42 may be fixedly connected to the contact vessel 10 in any manner other than the manner in which the holding member 42 is fixedly connected to the ceramic cover 11, such as the manner in which the holding member 42 is fixedly connected to the fixed frame 70.

[0128] Specifically, the relay further includes a fixed frame 70, which is disposed within the contact chamber 101 and fixedly connected to the yoke plate 13. The holding member 42 is fixedly connected to the fixed frame 70.

[0129] In one embodiment, the retaining member 42 is located between the pair of fixed contact lead-out ends 20. By providing the retaining member 42 at a position between the pair of fixed contact lead-out ends 20 in this way, it is possible to prevent the retaining member 42 from occupying excessive space within the contact chamber 101, which is advantageous for miniaturizing the relay.

[0130] In one embodiment, the retaining member 42 is made of a metallic material to improve the structural strength of the retaining member 42 .

[0131] 12 to 14, FIG. 12 is a schematic perspective view of a relay according to a second embodiment of the present disclosure, omitting the case, electromagnet unit, arc-extinguishing unit, ceramic cover 11, and flange member 12. FIG. 13 shows a cross-sectional view of the CC after the ceramic cover and flange member are assembled in FIG. 12. FIG. 14 shows an exploded schematic view of FIG. 12. The second embodiment will be described with reference to the first embodiment, with the difference being that a first coupling member 810 and a second coupling member 820 are connected by a snap.

[0132] For example, the snap force between the first coupling member 810 and the second coupling member 820 may be 20 N, i.e., the threshold value may be 20 N. When the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is 20 N or less, the first coupling member 810 and the second coupling member 820 remain connected, and the first magnetic conductive body 40 is at the first position P1. When the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 exceeds 20 N, the second coupling member 820 disengages from the first coupling member 810, and the first magnetic conductive body 40 moves. At this time, since the snap connection between the first connecting member 810 and the second connecting member 820 is released, during the process of the first magnetic conductive body 40 moving from the first position P1 to the second position P2, the snap connection structure between the first connecting member 810 and the second connecting member 820 does not affect the movement of the first magnetic conductive body 40 from the first position P1 to the second position P2, and therefore the movement response speed of the first magnetic conductive body 40 becomes faster and its sensitivity to short circuit resistance becomes higher.

[0133] As shown in Figures 15 to 18, Figure 15 is a cross-sectional view taken along line DD in Figure 12, showing that the first magnetic conductive body 40 is at a first position P1. Figure 16 is a partially enlarged view taken along line X2 in Figure 15. Figure 17 is a cross-sectional view taken along line DD in Figure 12, showing that the first magnetic conductive body 40 is at a second position P2. Figure 18 is a partially enlarged view taken along line Y2 in Figure 17.

[0134] As an example, one of the first coupling member 810 and the second coupling member 820 includes a clamp post 811 and a protrusion 812 provided on the outer periphery of the clamp post 811. The other of the first coupling member 810 and the second coupling member 820 includes a clamp sleeve 821 and a clamp groove 822 provided on the inner periphery of the clamp sleeve 821. The clamp post 811 is inserted into the clamp sleeve 821, and the protrusion 812 is connected to the clamp groove 822.

[0135] In this embodiment, the first coupling member 810 includes a clamping post 811 and a protrusion 812. The protrusion 812 is protruded from the outer periphery of the clamping post 811, and the clamping post 811 is connected to the holding member 42. The second coupling member 820 includes a clamping sleeve 821 and a clamping groove 822. The clamping groove 822 is recessed into the inner periphery of the clamping sleeve 821, and the clamping sleeve 821 is connected to the first magnetic conductive body 40.

[0136] 15 and 16, the clamping post 811 is inserted into the clamping sleeve 821, and the protrusion 812 is connected to the clamping groove 822. In this way, when the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is smaller than or equal to the magnetic attractive force between the protrusion 812 and the clamping groove 822, the first magnetic conductive body 40 does not move with the second magnetic conductive body 55, and is at a first position P1, i.e., the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is a first interval H1.

[0137] 17 and 18, when the magnetic attraction force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is greater than the connecting force between the protrusion 812 and the clamp groove 822, the protrusion 812 escapes from the clamp groove 822, the clamp pillar 811 moves relative to the clamp sleeve 821, and the first magnetic conductive body 40 moves from the first position P1 to the second position P2. When the first magnetic conductive body 40 is located at the second position P2, the distance between the first magnetic conductive body 40 and the second magnetic conductive body 55 is the second interval H2.

[0138] As shown in Figures 19 to 23, Figure 19 is a schematic perspective view of a relay according to a third embodiment of the present disclosure, with the case, electromagnet unit, arc-extinguishing unit, ceramic cover, and flange member omitted. Figure 20 is a schematic diagram of Figure 19 with the ceramic cover 11 and flange member 12 omitted. Figure 21 is a schematic top view of Figure 19. Figure 22 is a cross-sectional view of EE in Figure 21. Figure 23 is an exploded schematic view of Figure 19. In the third embodiment, explanations of commonalities with the first embodiment will be omitted, and the differences are as follows.

[0139] The first magnetic conductive body 40 has a bore 41. The first coupling member 810 includes a guide post 830, which is inserted into the bore 41 and fixedly installed relative to the contact chamber 101. The second coupling member 820 includes an elastic snap ring 840, which is movably provided on one end of the guide post 830 adjacent to the second magnetic conductive body 55. In the locked position, the elastic snap ring 840 stops the first magnetic conductive body 40 from moving relative to the guide post 830 in a direction toward the second magnetic conductive body 55.

[0140] In this embodiment, the magnitude of the threshold value can be considered to be the magnitude of the frictional force between the elastic biasing force of the elastic snap ring 840 connected to the guide column 830 and the guide column 830 .

[0141] Specifically, the elastic snap ring 840 itself has an elastic biasing force, which allows the elastic snap ring 840 to connect to the outer periphery of the guide post 830 and prevents the first magnetic conductive body 40 from moving relative to the guide post 830 in the direction toward the second magnetic conductive body 55. When the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is equal to or smaller than the frictional force between the elastic biasing force of the elastic snap ring 840 and the guide post 830, the first magnetic conductive body 40 is stopped and held at the first position P1. When the magnetic attractive force between the first magnetic conductive body 40 and the second magnetic conductive body 55 is greater than a threshold (the frictional force between the elastic snap ring 840 and the guide post 830), the magnetic attractive force allows the first magnetic conductive body 40 to move relative to the guide post 830. At the same time, the first magnetic conductive body 40 can drive the elastic snap ring 840 to separate from its initial connection position with the guide post 830.

[0142] A recessed groove 401 is provided on the side of the first magnetic conductive body 40 facing the second magnetic conductive body 55, and the recessed groove 401 communicates with the perforation 41. The first magnetic conductive body 40 is at the first position P1, and the elastic snap ring 840 and the guide post 830 have their ends adjacent to the second magnetic conductive body 55 housed in the recessed groove 401. The elastic snap ring 840 is then stopped at the bottom of the recess of the recessed groove 401.

[0143] By providing the recessed groove 401, the elastic snap ring 840 and one end of the guide pillar 830 adjacent to the second magnetic conductive body 55 can both be hidden within the recessed groove 401, avoiding exposure on one side of the first magnetic conductive body 40 facing the second magnetic conductive body 55. This makes it possible to prevent the first magnetic conductive body 40 from moving from the first position P1 to the second position P2 due to the exposed portions of the elastic snap ring 840 and the guide pillar 830.

[0144] 24 and 25, Fig. 24 is a cross-sectional view taken along line FF in Fig. 21, omitting the ceramic cover and flange member, and showing the first magnetic conductive body 40 at the first position P1. Fig. 25 is a partially enlarged view taken along line X3 in Fig. 24. When the first magnetic conductive body 40 is at the first position P1, the elastic snap ring 840 is connected to the outer periphery of the guide post 830 and is stopped by the bottom wall of the recessed groove 401 of the first magnetic conductive body 40.

[0145] 26 and 27, Fig. 26 is a cross-sectional view taken along line FF in Fig. 21, omitting the ceramic cover and flange member, and showing that the first magnetic conductive body 40 is in the second position P2. Fig. 27 is a partially enlarged view taken along line Y3 in Fig. 26. A stopper structure 850 is further provided between the guide pillar 830 and the first magnetic conductive body 40 to stop the first magnetic conductive body 40 at the second position P2 when the elastic snap ring 840 is in the released position.

[0146] When the magnetic attraction force between the first magnetic body 40 and the second magnetic body 55 is greater than a threshold value, the first magnetic body 40 moves from the first position P1 to the second position P2. The stopper structure 850 can hold the first magnetic body 40 at the second position P2.

[0147] After the first magnetic conductive body 40 moves from the first position P1 to the second position P2, the elastic snap ring 840 may still be connected to the guide post 830, or may be detached from the guide post 830.

[0148] The stopper structure 850 includes a first stopper portion 851 and a second stopper portion 852, the first stopper portion 851 being disposed in the bore 41 of the first magnetic conductive body 40, and the second stopper portion 852 being disposed on the guide post 830. Here, when the first magnetic conductive body 40 is at the second position P2, the first stopper portion 851 and the second stopper portion 852 stop each other.

[0149] For example, the wall of the perforation 41 of the first magnetic conductive body 40 may have a stepped structure, and the outer wall of the guide column 830 may also have a stepped structure, with the two stepped structures matching each other to achieve stopping.

[0150] 23, 24 and 26, the contact container 10 further has a fourth through hole 104, which communicates with the contact chamber 101. A guide post 830 is drilled in the fourth through hole 104 and includes a third end 831 and a fourth end 832, the third end 831 is connected to the contact container 10, and an elastic snap ring 840 is provided at the fourth end 832.

[0151] As an example, the third end 831 of the guide pole 830 and the contact vessel 10 may be connected by a welding terminal 105 .

[0152] A fourth through-hole 104 is opened in the contact vessel 10, a guide pole 830 is drilled in the fourth through-hole 104, the guide pole 830 is connected to the contact vessel 10, and the first magnetic conductive body 40 is connected to the guide pole 830. The first magnetic conductive body 40 is connected to the contact vessel 10 via the guide pole 830 and is not directly connected to the contact vessel 10, so the connection process is unobstructed and visible, the operation is convenient, and the connection reliability is ensured.

[0153] As a result, the third end 831 of the guide pillar 830 can be connected to the contact container 10, and the fourth end 832 of the guide pillar 830 can be matched with the elastic snap ring 840. By providing the guide pillar 830, the first magnetic conductive body 40 can be moved from the first position P1 to the second position P2, and the first magnetic conductive body 40 can be connected to the contact container 10, thereby achieving the effects of simplifying assembly and saving material costs.

[0154] For example, the fourth through hole 104 is formed in the top wall 111 of the ceramic cover 11. The fourth through hole 104 may be located between two first through holes 102, i.e., the guide post 830 may be located between a pair of fixed contact lead-out ends 20.

[0155] The first through-hole 102 and the fourth through-hole 104 are formed in the top wall 111 , and the third end 831 of the guide post 830 is connected to the outer wall surface of the top wall 111 .

[0156] On the outer wall surface of the top wall 111, a first metallization layer 113 is provided around the periphery of the first through hole 102, and a third metallization layer 115 is provided around the periphery of the fourth through hole 104. The fixed contact lead-out end 20 is welded to the top wall 111 via the first metallization layer 113, and the third end 831 of the guide post 830 is welded to the top wall 111 via the third metallization layer 115.

[0157] It is easier to form a flat weld plane on the outer wall surface of the top wall 111 of the ceramic cover 11 than on the inner wall surface of the ceramic cover 11. Furthermore, the fixed contact lead end 20 needs to be provided on the top wall 111 of the ceramic cover 11. However, if the fixed contact lead end 20 is to be welded to the top wall 111, a metallized layer needs to be provided around the periphery of the first through hole 102. Therefore, when processing the first metallized layer 113 of the first through hole 102, the third metallized layer 115 of the fourth through hole 104 is also processed at the same time. Therefore, by welding the guide post 830 to the outer wall surface of the top wall 111 of the ceramic cover 11, a metallized layer can be processed on the outer wall surface of the top wall 111, eliminating the need to process a metallized layer on the inner wall surface of the top wall 111, which facilitates processing and simplifies the processing steps.

[0158] The first magnetic conductive body 40 is installed at a distance from the inner wall surface of the top wall 111. By installing the first magnetic conductive body 40 at a distance from the inner wall surface of the top wall 111, a gap is formed between the first magnetic conductive body 40 and the inner wall surface of the top wall 111. Because the first magnetic conductive body 40 does not directly contact the inner wall surface of the top wall 111, the installation of the first magnetic conductive body 40 does not affect the creepage distance between the pair of fixed contact lead-out ends 20.

[0159] In one embodiment, the top wall 111 and the side wall 112 of the ceramic cover 11 are separate structures and are connected by welding.

[0160] Furthermore, the ceramic cover 11 is designed to have a separate structure of the top wall 111 and the side wall 112, which makes it easier to connect the guide posts 830 to the top wall 111. Of course, in other embodiments, the top wall 111 and the side wall 112 may be glued together.

[0161] Specifically, because the top wall 111 is sheet-shaped, the sheet-shaped structure makes it easy to process the first through hole 102, the fourth through hole 104, the first metallization layer 113, and the third metallization layer 115 on the top wall 111. Furthermore, the sheet-shaped structure makes it easy to weld the guide post 830 to the top wall 111 and the fixed contact lead-out end 20 to the top wall 111.

[0162] In addition, the manner in which the guide column 830 is fixed to the contact vessel 10 may be other than being fixedly connected to the top wall 111 of the ceramic cover 11 as described above, such that the guide column 830 is fixedly connected to the fixed frame 70, which is disposed within the contact chamber 101 and fixedly connected to the yoke plate 13. Specifically, the manner in which the fixed frame 70 is installed in the relay of the first embodiment of the present disclosure may be referred to, and the description thereof will be omitted here.

[0163] As shown in Figures 28 to 35, the fourth embodiment will not be described in terms of the commonalities with the third embodiment, and the difference is that in the release position, an elastic snap ring 840 is interposed between the first magnetic body 40 and the second stopper portion 852.

[0164] Specifically, the first stopper portion 851 of the stopper structure 850 is provided on the periphery of the perforation 41, and the second stopper portion 852 is provided on the fourth end 832 of the guide pillar 830.

[0165] 32 and 33 , when the first magnetic conductive body 40 is at the first position P1, the elastic snap ring 840 is connected to the outer periphery of the guide pillar 830 and abuts against the first stopper portion 851, thereby holding the first magnetic conductive body 40 at the first position P1. At this time, the elastic snap ring 840 and the second stopper portion 852 are both located within the recessed groove 401 of the first magnetic conductive body 40.

[0166] 34 and 35 , in the process of the first magnetic conductive body 40 moving from the first position P1 to the second position P2, the elastic snap ring 840 moves toward the fourth end 832 of the guide pillar 830 until it comes into contact with the second stopper portion 852. When the first magnetic conductive body 40 moves to the second position P2, the elastic snap ring 840 is interposed between the first stopper portion 851 and the second stopper portion 852.

[0167] Note that the examples / embodiments of the present disclosure can be combined with each other unless a contradiction arises, and will not be exemplified here.

[0168] In this disclosure, the terms "first," "second," and "third" are for descriptive purposes only and do not indicate or imply relative importance; the terms "a pair" and "one," unless otherwise specified, are used only to highlight technical features and should not be understood as a limitation on the specific number of such technical features; and the term "plurality" refers to two or more than two unless otherwise specified. The terms "attached," "coupled," "connected," "fixed," etc. should all be understood broadly; for example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; "connected" may refer to a direct connection or an indirect connection via an intermediate medium. Those skilled in the art can understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0169] In describing the present disclosure, orientations or positional relationships indicated by the terms "up," "down," "left," "right," "front," "rear," etc. are based on the orientations or positional relationships shown in the drawings and are merely for the purpose of simplifying the description and explanation of the present disclosure, and do not indicate or imply that the referred devices or units must have a particular direction and be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present disclosure.

[0170] In the description herein, the terms "one embodiment," "some embodiments," "specific embodiments," etc., mean that the specific feature, structure, material, or characteristic described in the embodiment or example is included in at least one embodiment or example of the present disclosure. In the description herein, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific feature, structure, material, or characteristic may be combined in any suitable manner in any one or more embodiments or examples.

[0171] The above is merely a preferred embodiment of the present disclosure, and does not limit the present disclosure, and various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present disclosure should be included within the protection scope of the present disclosure. [Explanation of symbols]

[0172] 10: Contact container 101: Contact chamber 102: First through hole 103: Second through hole 104: Fourth through hole 105: Welding terminal 11a: Insulating cover 11: Ceramic cover 111: Top wall 112: Side wall 113: First metallization layer 114:Second metallization layer 115: Third metallization layer 12: Flange member 13:Yoke board 131: Third through hole 20: Fixed contact pullout end 30: Connection member 31: First end of connecting member 32: Second end of connecting member 40: First magnetic conductor 401: Groove 41: Perforation 42: Holding member 43: Limit structure 431: Limit groove 432: Limit Block 433: Stopper wall 434: Limit Wall 50: Push rod assembly 51: Rod section 52: Bass 53: Movable parts 54: Movable contact 55:Second magnetic conductor 56: Elastic member 57: Slide structure 571: Limit 572: Limit hole 70: Fixed frame 80: Trip assembly 810: First connecting member 811: Clamp column 812: Convex 820: Second connecting member 821: Clamp sleeve 822: Clamp groove 830: Guide pillar 831: Third end 832: 4th end 840: Elastic snap ring 850: Stopper structure 851: First stopper part 852: Second stopper part 1100:Case 1110: Case 1 1120: Case 2 1130: Exposure hole 1200: Electromagnet unit 1210: Coil bobbin 1220: Coil 1230: Fixed core 1240: moving core 1250: Reset member 1300: Arc extinguishing unit 1310: Arc-extinguishing magnet 1320:Yoke clamp 1400: Seal unit 1410: Metal cover P1: 1st position P2: 2nd position H1: 1st interval H2: 2nd interval D1:Motion direction D2: Longitudinal direction

Claims

1. A relay, The relay includes a contact can, a pair of fixed contact leads, a first magnetic conductive body, a movable member, and a trip assembly; the contact vessel has a contact chamber; a pair of the fixed contact lead ends connected to the contact container, at least a portion of the fixed contact lead ends located within the contact chamber; the first magnetic conductive body is movably provided in the contact chamber, and has a first position and a second position relative to the contact container; the movable member includes a movable contact and a second magnetic conductive body, both ends of the movable contact are used to contact or separate the pair of fixed contact pull-out ends, the first magnetic conductive body is provided on the side of the movable contact facing the fixed contact pull-out ends, the second magnetic conductive body is fixedly connected to the side of the movable contact facing away from the fixed contact pull-out ends, the second magnetic conductive body is used to form a magnetic circuit with the first magnetic conductive body, at the first position, the distance between the first magnetic conductive body and the second magnetic conductive body is a first interval, at the second position, the distance between the first magnetic conductive body and the second magnetic conductive body is a second interval, the first interval is larger than the second interval, The first magnetic conductive body is connected to the contact receptacle via the trip assembly, and the trip assembly is used to release the first magnetic conductive body when a magnetic attraction force between the first magnetic conductive body and the second magnetic conductive body is greater than a threshold value.

2. the first magnetic conductive body is located at the first position, and the value of the current flowing through the movable contact is smaller than or equal to a threshold current; 2. The relay of claim 1, wherein when a value of the current flowing through the movable contact is greater than the threshold current, the trip assembly releases the first magnetic body so that the first magnetic body is attracted by the magnetic attractive force and moved from the first position to the second position.

3. The trip assembly includes: a first coupling member fixedly installed to the contact container; a second coupling member, the second coupling member having positions relative to the first coupling member including a locked position and an unlocked position; 2. The relay according to claim 1, wherein, in the locked position, the second coupling member and the first coupling member are coupled to each other so as to position the first magnetic conductive body at the first position, and, in the released position, the second coupling member and the first coupling member are disengaged from each other so as to move the first magnetic conductive body from the first position to the second position.

4. the second coupling member is fixedly connected to the first magnetic conductive body, and the trip assembly further includes a retaining member; 4. The relay of claim 3, wherein the retaining member is at least partially disposed within the contact chamber and fixedly mounted relative to the contact receptacle, and the first coupling member is fixedly connected to the retaining member.

5. 5. The relay according to claim 4, wherein the first magnetic conductive body is movably connected to the holding member by a limit structure, and the limit structure is used to limit movement of the first magnetic conductive body from the first position to the second position relative to the holding member.

6. The limit structure includes a limit groove and a limit block, the limit groove is provided in one of the first magnetic conductive body and the holding member, the limit groove extends along the moving direction of the movable contact, and the limit groove has a stopper wall at one end of a groove wall adjacent to the second magnetic conductive body, 6. The relay according to claim 5, wherein the limit block is provided on the other of the first magnetic body and the holding member, the limit block is slidably matched with the limit groove, and the stopper wall is stopped by the limit block at the second position.

7. At the first position, there is a first gap between the limit block and a groove wall of the limit groove, At the second position, there is a second gap between the limit block and the groove wall of the limit groove, The relay of claim 6 , wherein the first gap is smaller than the second gap.

8. the contact container further has a pair of first and second through holes, the first and second through holes both communicating with the contact chamber, and the pair of fixed contact lead-out ends are drilled in a one-to-one correspondence with the pair of first through holes; 5. The relay according to claim 4, further comprising a connecting member, the connecting member being drilled in the second through-hole and having a first end and a second end, the first end being connected to the contact container and the second end being connected to the holding member.

9. The contact vessel comprises: a yoke plate and an insulating cover, the insulating cover is connected to the yoke plate, and the insulating cover and the yoke plate surround each other to form the contact chamber; The relay according to claim 8 , wherein the first through-hole and the second through-hole are formed in the insulating cover, and the first end of the connecting member is connected to an outer wall surface of the insulating cover.

10. the insulating cover includes a ceramic cover and a flange member, the ceramic cover includes a top wall and a side wall, one end of the side wall is connected to the periphery of the top wall, and the other end of the side wall is connected to the yoke plate via the flange member, the first through hole and the second through hole are formed in the top wall, and on an outer wall surface of the top wall, a first metallized layer is provided around the periphery of the first through hole, and a second metallized layer is provided around the periphery of the second through hole; 10. The relay of claim 9, wherein the fixed contact lead end is welded to the top wall through the first metallization layer, and the first end of the connecting member is welded to the top wall through the second metallization layer.

11. The relay of claim 10 , wherein the top wall and the side wall are integral; or the top wall and the side wall are separate.

12. The relay according to claim 10 , wherein the holding member is disposed spaced apart from an inner wall surface of the top wall.

13. The contact vessel comprises: a yoke plate and an insulating cover, the insulating cover is connected to the yoke plate, and the insulating cover and the yoke plate surround each other to form the contact chamber; The relay according to claim 4 , further comprising a fixed frame disposed within the contact chamber and fixedly connected to the yoke plate, and the holding member fixedly connected to the fixed frame.

14. The relay according to claim 4 , wherein the holding member is located between the pair of fixed contact lead-out ends.

15. The relay according to claim 4 , wherein the holding member is made of a metal material.

16. the second coupling member is fixedly connected to the first magnetic conductive body, The relay according to claim 3 , wherein the first coupling member and the second coupling member are connected magnetically.

17. 17. The relay of claim 16, wherein one of the first coupling member and the second coupling member is a permanent magnet and the other is an iron block.

18. the second coupling member is fixedly connected to the first magnetic conductive body, The relay according to claim 3 , wherein the first and second coupling members are connected by a snap.

19. One of the first connecting member and the second connecting member includes a clamp post and a protrusion provided on an outer periphery of the clamp post, the other of the first connecting member and the second connecting member includes a clamp sleeve and a clamp groove recessed in an inner peripheral wall of the clamp sleeve, The relay according to claim 18, wherein the clamping post is inserted into the clamping sleeve, and the protrusion is connected to the clamping groove.

20. the first magnetic conductive body has perforations; The first coupling member includes a guide post, the guide post being drilled into the hole and fixedly installed relative to the contact container; the second coupling member includes an elastic snap ring, and the elastic snap ring is movably fitted over one end of the guide post adjacent to the second magnetic conductive body; 4. The relay according to claim 3, wherein, in the locked position, the elastic snap ring prevents the first magnetic conductive body from moving relative to the guide post in a direction toward the second magnetic conductive body.

21. 21. The relay according to claim 20, further comprising a stopper structure between the guide post and the first magnetic conductive body, the stopper structure being used to stop the first magnetic conductive body at the second position when the elastic snap ring is in the release position.

22. The stopper structure is a first stopper portion provided on the first magnetic conductive body; a second stopper portion provided on the guide pillar, The relay according to claim 21 , wherein the first stopper portion and the second stopper portion stop each other when the first magnetic conductive body is in the second position.

23. In the released position, the resilient snap ring disengages from the guide post; or 23. The relay according to claim 22, wherein in the released position, the elastic snap ring is interposed between the first magnetic conductive body and the second stopper portion.

24. The first magnetic conductive body has a recessed groove formed on a side facing the second magnetic conductive body, the recessed groove communicating with the perforation, 21. The relay according to claim 20, wherein the first magnetic conductive body is in the first position, and one end of the guide post adjacent to the elastic snap ring and the second magnetic conductive body is housed in the recessed groove.

25. 2. The relay of claim 1, wherein in the second position, the second spacing between the first and second conductive bodies is zero.

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