Relay

Abstract

To provide a relay for solving problems with the related art.SOLUTION: A relay is provided comprising a contact container, a pair of static contact leading-out terminals, a connection member, a first magnetizer, and a pushing rod assembly. The contact container has a contact chamber, a pair of first through holes, and a second through hole, both the first and second through holes being in communication with the contact chamber. The pair of static contact leading-out terminals passes through the pair of the first through holes in one-to-one correspondence, and is connected to the contact container. The connection member passes through the second through hole and comprises a first end and a second end, the first end being connected to the contact container. The first magnetizer is disposed in the contact chamber, and connected to the second end of the connection member. The pushing rod assembly comprises a movable member with a movable contact piece, the movable member being movably disposed in the contact chamber to make the movable contact piece come into contact with or separate from the pair of static contact leading-out terminals. The first magnetizer is disposed at a side of the movable contact piece facing the static contact leading-out terminals.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of relay technology, and more specifically, to high-voltage DC relays.

Background Art

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

[0003] A high-voltage DC relay is a type of relay. When the short-circuit load is large, the contact of the high-voltage DC relay generates an electro-dynamic repulsive force due to the short-circuit current, causing the contact to bounce. The contact bounces instantaneously, and the relay may be burned out and exploded by a strong arc.

[0004] In related technologies, a relay usually installs a short-circuit resistant structure to prevent the contact from bouncing. Specifically, a magnetic conductor is installed inside the contact container of the relay. When an electro-dynamic repulsive force is generated by the short-circuit current, the magnetic conductor is magnetized to generate an electromagnetic attractive force, thereby preventing the movable contact from bouncing instantaneously and preventing the relay from being burned out and exploded.

[0005] However, in related technologies, the connection structure between the magnetic conductor and the contact container of the relay is unreasonably designed, and there is a problem that the connection between the magnetic conductor and the contact container is not strong and the assembly is not easy.

Summary of the Invention

[0006] Embodiments of the present invention provide a relay for solving the problem that the connection between the magnetic conductor and the contact container existing in related technologies is not strong and the assembly is not easy. The relay in the embodiment of the present invention includes a contact container, a pair of fixed contact lead-out ends, a connecting member, a first magnetic conductor, and a push rod assembly. The contact container has a contact chamber, a pair of first through holes and a second through hole. Both the first through hole and the second through hole communicate with the contact chamber. The pair of fixed contact lead-out ends are respectively drilled one by one in the pair of first through holes and are connected to the contact container. The connecting member is drilled in the second through hole and includes a first end and a second end. The first end is connected to the contact container. The first magnetic conductor is provided in the contact chamber and is connected to the second end of the connecting member. The push rod assembly includes a movable member having a movable contact. The movable member is movably provided in the contact chamber so as to bring the movable contact into contact with or separate from the pair of fixed contact lead-out ends. The first magnetic conductor is provided on the side where the movable contact faces the fixed contact lead-out end.

[0007] According to some embodiments of the present invention, the second through hole is provided between the pair of first through holes.

[0008] According to some embodiments of the present invention, the contact container includes a yoke plate and an insulating cover. The yoke plate has a third through hole communicating with the contact chamber. The push rod assembly is movably drilled in the third through hole. The insulating cover is connected to the yoke plate. The first through hole and the second through hole are opened in the insulating cover. The first end of the connecting member is connected to the outer surface of the insulating cover.

[0009] According to some embodiments of the present invention, the insulating cover includes a top wall and a side wall. One end of the side wall is connected to the outer periphery of the top wall, and the other end of the side wall is connected to the yoke plate. The first through hole and the second through hole are opened in the top wall.

[0010] According to some embodiments of the present invention, the insulating cover includes a ceramic cover and a flange member. The ceramic cover includes a top wall and side walls. The side walls are connected to the yoke plate via the flange member. On the outer surface of the top wall, a first metallization layer is provided on the periphery located in the first through hole, and a second metallization layer is provided on the periphery located in the second through hole. The fixed contact lead-out 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.

[0011] According to some embodiments of the present invention, the top wall and the side walls are of an integral structure, or the top wall and the side walls are of a separate structure and are connected by welding.

[0012] According to some embodiments of the present invention, the first magnetic conductor is provided at a distance from the inner surface of the top wall.

[0013] According to some embodiments of the present invention, the second end of the connecting member is riveted or welded or adhered to the first magnetic conductor.

[0014] According to some embodiments of the present invention, the first magnetic conductor includes a plurality of laminated magnetic conductor sheets, and the plurality of magnetic conductor sheets are connected to the second end of the connecting member.

[0015] According to some embodiments of the present invention, the push rod assembly further includes a base, an elastic member, and a limit structure. One end of the elastic member abuts against the base, and the other end abuts against the movable member. The elastic member supplies an elastic force so that the movable contact has a tendency to move towards the fixed contact lead-out end. The limit structure is connected to the base and the movable member, and is used to limit the movement range of the movable member relative to the base. The limit structure includes a fitting limit hole and a limit portion. The limit hole includes a first end and a second end provided opposite to the moving direction of the movable contact. The limit portion is movably formed between the first end and the second end of the limit hole. When the movable contact is separated from the fixed contact lead-out end, the limit portion is located at the first end of the limit hole.

[0016] According to some embodiments of the present invention, the aperture diameter of the second end is larger than that of the first end.

[0017] According to some embodiments of the present invention, the limit portion has a first arc-shaped surface. The first arc-shaped surface realizes a limit with the limit hole when the limit portion is located at the first end of the limit hole.

[0018] According to some embodiments of the present invention, the movable member further includes a fixing member fixedly connected to the movable contact. The limit portion is provided on one of the fixing member and the base, and the limit hole is provided on the other of the fixing member and the base.

[0019] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0020] In the relay according to the embodiment of the present invention, the first magnetic conductor is connected to the contact container without being interlocked with the push rod assembly. Thereby, the magnetic attraction force of the movable contact against the first magnetic conductor acts on the contact container through the connection member. Since the position of the contact container is relatively fixed, it is possible to avoid the movable contact and the fixed contact lead-out end from bouncing due to the insufficient holding force of the push rod assembly, causing burnout and explosion of the relay. On the other hand, by providing the connection member, the first magnetic conductor is connected to the contact container through the connection member. The first magnetic conductor connects the contact container through the connection member, rather than directly connecting to the contact container, and can be visualized without obstructing the connection process, which is convenient for operation and can ensure the reliability of the connection.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Description of Reference Numerals

[0022] 10, contact container; 101, contact chamber; 102, first through-hole; 103, second through-hole; 11a, insulating cover; 11, ceramic cover; 111, top wall; 112, side wall; 113, first metallization layer; 114, second metallization layer; 12, flange member; 13, yoke plate; 131, third through-hole; 20, fixed contact lead-out end; 30, connecting member; 31, first end of the connecting member; 32, second end of the connecting member; 40, first magnetic conductor; 41, magnetic conductive piece; 411, opening; 50, push rod assembly; 51, push rod; 52, base; 521, base portion; 522, first limit member; 523, second limit member; 524, second arcuate surface; 53, movable member; 54, movable contact; 55, second magnetic conductor; 551, bottom; 552, first side; 553, second side; 56, elastic member; 57, limit structure; 571, limit portion; 571a, first arcuate surface; 572, limit hole; 573, first end of the limit hole; 574, second end of the limit hole; 575, first plane; 576, second plane; 577, first inclined surface; 578, second inclined surface; 579, rivet; 58, fixing member; 1100, housing; 1110, first case; 1120, second case; 1130, exposed hole; 1200, electromagnetic unit; 1210, coil bobbin; 1220, coil; 1230, fixed iron core; 1231, through-hole; 1240, movable iron core; 1250, reset member; 1300, arc extinguishing unit; 1310, arc extinguishing magnet; 1320, yoke clamp; 1400, sealing unit; 1410, metal cover; D1, moving direction; D2, longitudinal direction; D3, width direction.

Embodiments for Carrying Out the Invention

[0023] Next, with reference to the drawings, exemplary embodiments will be described in more detail. However, the exemplary embodiments can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided so that the present invention is comprehensive and complete, and can fully convey the concept of the exemplary embodiments to those skilled in the art. Since the same reference numerals in the figures represent the same or similar structures, detailed descriptions thereof will be omitted.

[0024] As shown in FIGS. 14 to 16, FIG. 14 is an exploded schematic view of a relay according to a first embodiment of the present invention. The relay includes a housing 1100, an electromagnet unit 1200, an arc extinguishing unit 1300, and a sealing unit 1400. The sealing unit 1400 is provided in the housing 1100, and the top of the fixed contact lead-out end of the sealing unit 1400 is exposed to the outer surface of the housing 1100 through the exposed hole 1130 of the housing 1100. The electromagnet unit 1200 and the arc extinguishing unit 1300 are provided in the housing 1100.

[0025] As an example, the housing 1100 includes a first case 1110 and a second case 1120. The first case 1110 and the second case 1120 are engaged and connected to form a chamber for accommodating the electromagnet unit 1200, the arc extinguishing unit 1300, and the sealing unit 1400.

[0026] The arc extinguishing unit 1300 is used to extinguish the arc generated between the fixed contact lead-out end of the sealing unit 1400 and the movable contact.

[0027] As an example, the arc extinguishing unit 1300 includes two arc extinguishing magnets 1310. The arc extinguishing magnet 1310 may be a permanent magnet, and each arc extinguishing magnet 1310 may be substantially in the shape of a rectangular parallelepiped. The two arc extinguishing magnets 1310 are respectively provided on both sides of the insulating cover and are provided opposite to each other along the longitudinal direction D2 of the movable contact.

[0028] By providing two arc extinguishing magnets 1310 provided opposite to each other, a magnetic field can be formed around the fixed contact lead-out end and the movable contact. Therefore, the arc generated between the fixed contact lead-out end and the movable contact is stretched in a direction away from each other by the action of the magnetic field, realizing arc extinguishing.

[0029] The arc extinguishing unit 1300 further includes two yoke clamps 1320 arranged corresponding to the positions of the two arc extinguishing magnets 1310. And the two yoke clamps 1320 surround the seal unit 1400 and the two arc extinguishing magnets 1310. By the design around the arc extinguishing magnet 1310 by the yoke clamp 1320, it is possible to avoid the magnetic field by the arc extinguishing magnet 1310 from diffusing to the outside and affecting the arc extinguishing effect. The yoke clamp 1320 is made of a soft magnetic material. Examples of the soft magnetic material include, but are not limited to, iron, cobalt, nickel, and their alloys.

[0030] As shown in FIGS. 1 to 4, FIGS. 15 and 16, FIG. 1 is a perspective schematic view of a relay in the first embodiment of the present invention, where the coil and the magnetic circuit are omitted. FIG. 2 shows a plan schematic view of FIG. 1. FIG. 3 shows a cross-sectional view taken along line A-A in FIG. 2. FIG. 4 shows an exploded schematic view of FIG. 1. FIG. 15 shows a perspective schematic view of FIG. 1 with the insulating cover omitted. FIG. 16 shows a cross-sectional view taken along line C-C in FIG. 2.

[0031] The seal unit 1400 according to an embodiment of the present invention includes a contact container 10, a pair of fixed contact leads 20, a connection member 30, a first magnetic conductor 40, and a push rod assembly 50. The contact container 10 has a contact chamber 101, a pair of first through holes 102, and one second through hole 103, and both the first through hole 102 and the second through hole 103 communicate with the contact chamber 101. The pair of fixed contact leads 20 are connected to the contact container 10 and are respectively bored one-to-one in the pair of first through holes 102. The connection member 30 is bored in the second through hole 103 and includes a first end 31 and a second end 32, and the first end 31 is connected to the container wall of the contact container 10. The first magnetic conductor 40 is provided in the contact chamber 101 and is connected to the second end 32 of the connection member 30. The push rod assembly 50 includes a movable member 53 having a movable contact 54, and the movable member 53 is movably provided in the contact chamber 101 so as to bring the movable contact 54 into contact with or separate from the pair of fixed contact leads 20 (fixed contacts), and the first magnetic conductor 40 is provided on the side where the movable contact 54 faces the fixed contact lead 20.

[0032] Note that in the relay according to the embodiment of the present invention, when the first magnetic conductor 40 is provided above (on the upper side) of the movable contact 54 and both ends of the movable contact 54 contact the pair of fixed contact leads 20, current passes through the movable contact 54, so that a magnetic conduction circuit surrounding the movable contact 54 is formed on the outer periphery of the movable contact 54 in the longitudinal direction D2. Due to the presence of the first magnetic conductor 40, most of the magnetic field of the magnetic conduction circuit gathers at the first magnetic conductor 40 and magnetizes the first magnetic conductor 40. Thus, a magnetic attraction force along the pressure direction of the contact is generated between the first magnetic conductor 40 and the movable contact 54 through which current flows. This magnetic attraction force counteracts the electromotive repulsive force due to the short-circuit current between the movable contact 54 and the fixed contact lead 20, ensuring that the movable contact 54 and the fixed contact lead 20 do not bounce.

[0033] Further, the first magnetic conductor 40 is connected to the contact container 10 via the connection member 30. The first magnetic conductor 40 is connected to the contact container 10. Without being interlocked with the push rod assembly 50, the magnetic attraction force of the movable contact 54 on the first magnetic conductor 40 acts on the contact container 10 via the connection member 30. Since the position of the contact container 10 is relatively fixed, thereby, due to the insufficient holding force of the push rod assembly 50, the movable contact 54 and the fixed contact lead-out end 20 can be prevented from bouncing, relay burnout, and explosion. On the other hand, a second through-hole 103 is formed in the contact container 10, and the connection member 30 is formed through the second through-hole 103. Thereby, the connection member 30 is connected to the contact container 10, and the first magnetic conductor 40 is connected to the connection member 30. Although the first magnetic conductor 40 is connected to the contact container 10 via the connection member 30, it is not directly connected to the contact container 10. It can be visualized without blocking the connection process, the operation is easy, and the connection reliability can be ensured.

[0034] Furthermore, the movable member 53 further includes a second magnetic conductor 55 provided in the contact chamber 101. The second magnetic conductor 55 is fixedly connected to the movable contact 54. The second magnetic conductor 55 is located on the side where the movable contact 54 faces away from the first magnetic conductor 40. The second magnetic conductor 55 is used to form a magnetic conduction circuit with the first magnetic conductor 40.

[0035] When both ends of the movable contact 54 contact a pair of fixed contact lead-out ends 20, the second magnetic conductor 55 that moves together with the movable contact 54 approaches or contacts the first magnetic conductor 40. Thereby, a magnetic conduction circuit surrounding the movable contact 54 is formed between the first magnetic conductor 40 and the second magnetic conductor 55. When a short-circuit current passes through the movable contact 54, a magnetic attraction force along the pressure direction of the contact is generated between the first magnetic conductor 40 and the second magnetic conductor 55. This magnetic attraction force resists the electrodynamic repulsive force caused by the short-circuit current between the movable contact 54 and the fixed contact lead-out end 20, ensuring that the movable contact 54 and the fixed contact lead-out end 20 do not bounce.

[0036] Note that the first magnetic conductor 40 and the second magnetic conductor 55 are respectively located on both sides of the movable contact 54. When the movable contact 54 is energized, the magnetic attraction force between the first magnetic conductor 40 and the second magnetic conductor 55 is a direct electromagnetic attraction force, which is greater than the magnetic attraction force between the movable contact 54 after only the first magnetic conductor 40 is magnetized. Therefore, it can better resist the electromotive repulsion force caused by the short-circuit current between the movable contact 54 and the fixed contact lead-out end 20, effectively improving the short-circuit withstand capacity.

[0037] As shown in FIG. 16, when both ends of the movable contact 54 and the pair of fixed contact lead-out ends 20 are disconnected, no current passes through the movable contact 54, so no magnetic attraction force is generated between the first magnetic conductor 40 and the second magnetic conductor 55.

[0038] Note that the terms "including" and "having" in the embodiments of the present invention are intended to cover non-exclusive inclusion and mean any deformation thereof. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, and optionally includes steps or units not listed, or optionally includes other steps or components specific to these processes, methods, products or devices.

[0039] The contact container 10 includes a yoke plate 13 and an insulating cover 11a. The insulating cover 11a covers the side surface of the yoke plate 13 to form the contact chamber 101 of the contact container 10. In one embodiment, the insulating cover 11a includes a top wall and a side wall, and a first through hole 102 and a second through hole 103 are opened in the top wall. The yoke plate 13 has a third through hole 131 communicating with the contact chamber 101, and the push rod assembly 50 is movably bored in the third through hole 131. Two yoke clamps 1320 surround the insulating cover 11a.

[0040] The insulating cover 11a includes a ceramic cover 11 and a flange member 12. The ceramic cover 11 is connected to the yoke plate 13 via the flange member 12. The flange member 12 can form a metal part with an annular structure such as an iron-nickel alloy, and one end thereof is connected to the opening edge of the ceramic cover 11 by laser welding, brazing, resistance welding, adhesion, or the like. The other end of the flange member 12 is connected to the yoke plate 13, and may similarly be laser welding, brazing, resistance welding, adhesion, or the like. A flange member 12 is provided between the ceramic cover 11 and the yoke plate 13, and the connection between the ceramic cover 11 and the yoke plate 13 can be facilitated.

[0041] The two arc extinguishing magnets 1310 are respectively located on both sides of the ceramic cover 11, and the two yoke clamps 1320 surround the ceramic cover 11 and the two arc extinguishing magnets 1310.

[0042] The ceramic cover 11 includes a top wall 111 and a side wall 112. One end of the side wall 112 is surrounded by the outer periphery of the top wall 111, and the other end of the side wall 112 is connected to the yoke plate 13 via the flange member 12. Both the first through hole 102 and the second through hole 103 are opened in the top wall 111, and the first end 31 of the connecting member 30 is connected to the outer surface of the top wall 111.

[0043] One of the pair of fixed contact terminals 20 functions as a current inflow terminal, and the other functions as a current outflow terminal. The fixed contact terminal 20 is formed through the first through hole 102, and a part of the fixed contact terminal 20 enters the contact chamber 101 to contact or separate from the movable contact 54. A part of the fixed contact terminal 20 is exposed on the outer surface of the ceramic cover 11.

[0044] The bottom of the fixed contact terminal 20 is used as a fixed contact, and the movable contact 54 can use both ends in its longitudinal direction D2 as movable contacts. The movable contacts at both ends of the movable contact 54 may protrude more than other parts of the movable contact 54, or may coincide with other parts.

[0045] Note that the fixed contact may be provided integrally or separately at the bottom of the fixed contact lead-out terminal 20, and the movable contact may be provided integrally or separately at both ends in the longitudinal direction D2 of the movable contact element 54.

[0046] The second through-hole 103 is provided between the two first through-holes 102, that is, the connecting member 30 may be provided between the pair of fixed contact lead-out terminals 20. The number of the second through-holes 103 may be one or more. In this embodiment, the number of the second through-holes 103 is two, but it is not limited thereto.

[0047] Correspondingly, the number of the connecting members 30 may be one or more. In this embodiment, the number of the connecting members 30 is two, but it is not limited thereto.

[0048] Referring to FIG. 4, on the outer surface of the top wall 111 of the ceramic cover 11, a first metallization layer 113 is provided at the periphery located in the first through-hole 102, and a second metallization layer 114 is provided at the periphery located in the second through-hole 103. The fixed contact lead-out terminal 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.

[0049] The outer surface of the top wall 111 of the ceramic cover 11 is more likely to form a welding plane than the inner surface of the ceramic cover 11. In addition, it is necessary to provide the fixed contact lead-out terminal 20 on the top wall 111 of the ceramic cover 11, and it is also necessary to provide a metallization layer at the periphery of the first through-hole 102 even when welding the fixed contact lead-out terminal 20 and the top wall 111. Therefore, when processing the first metallization layer 113 of the first through-hole 102, the second metallization layer 114 of the second through-hole 103 is processed collectively. Therefore, by welding the connecting member 30 to the outer surface of the top wall 111 of the ceramic cover 11, it is possible to process the metallization layer only on the outer surface of the top wall 111 without the need to process the metallization layer on the inner surface of the top wall 111, the processing is easy, and the processing process is also simplified.

[0050] The first magnetic conductor 40 is provided at a distance from the inner surface of the top wall 111. That is, the length of the connecting member 30 is greater than the sum of the thickness of the top wall 111 and the thickness of the first magnetic conductor 40 so that the first magnetic conductor 40 is suspended from the top wall 111 of the ceramic cover 11 via the connecting member 30.

[0051] The first magnetic conductor 40 is provided at a distance from the inner surface of the top wall 111 so as to have a gap therebetween. Since the first magnetic conductor 40 is not in direct contact with the inner surface of the top wall 111, it does not affect the creepage distance of the pair of fixed contact leads 20.

[0052] Furthermore, referring to FIGS. 3 and 4, the first magnetic conductor 40 includes a plurality of laminated magnetic sheets 41 connected to the second end 32 of the connecting member 30. Each magnetic sheet 41 is provided with an opening 411, and the connecting member 30 is inserted through the opening 411 and riveted to the lowermost (lower) magnetic sheet 41.

[0053] Of course, when the first magnetic conductor 40 includes a plurality of laminated magnetic sheets 41, the opening 411 of the lowermost magnetic sheet 41 may be a blind hole, and the openings 411 of the remaining magnetic sheets 41 may be through holes. The connecting member 30 is inserted through each opening 411 of the remaining magnetic sheets 41, and the second end of the connecting member 30 enters into the blind hole of the lowermost magnetic sheet 41 and is welded to this magnetic sheet 41.

[0054] Also, when the first magnetic conductor 40 is a single sheet, the first magnetic conductor 40 is provided with an opening 411, and the opening 411 may be a through hole or a blind hole. When the opening 411 is a through hole, the connecting member 30 passes through the opening 411 and is then riveted to the first magnetic conductor 40. When the opening 411 is a blind hole, solder is provided in the blind hole, and the second end 32 of the connecting member 30 enters into the blind hole and may be welded to the first magnetic conductor 40.

[0055] As an example, when the short-circuit current exceeds 10 kA, it is necessary to increase the thickness of the first magnetic conductor 40 in order to generate a greater magnetic attraction force. Furthermore, it is necessary to ensure that the magnetic attraction force between the first magnetic conductor 40 and the second magnetic conductor 55 can overcome the repulsive force caused by the short-circuit current and prevent the movable contact 54 from separating from the fixed contact lead-out end 20. However, a first magnetic conductor 40 with a large thickness results in high costs and makes it difficult to connect with the ceramic cover 11.

[0056] In this embodiment, since the first magnetic conductor 40 is connected to the contact container 10 via the connection member 30, the first magnetic conductor 40 can include a plurality of laminated magnetic conductor sheets 41. By drilling through-holes 411 in the plurality of magnetic conductor sheets 41 via the connection member 30 and connecting them to the contact container 10, the overall thickness of the first magnetic conductor 40 can be increased by increasing the number of thin magnetic conductor sheets 41. Since the magnetic conductor sheet 41 is thin and can be made of a thin material, the material cost is low and it is easy to operate. On the other hand, the number of magnetic conductor sheets 41 can be flexibly adjusted according to the magnitude of the short-circuit current.

[0057] The top wall 111 and the side wall 112 of the ceramic cover 11 may have a separate structure or may be connected by welding. Note that designing the ceramic cover 11 with a separate structure for the top wall 111 and the side wall 112 makes it easier to connect the connection member 30 to the top wall 111. Of course, the top wall 111 and the side wall 112 may also be connected by adhesion.

[0058] Specifically, since the top wall 111 is sheet-shaped, it is easier 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 also facilitates the welding of the connection member 30 to the top wall 111 and the fixed contact lead-out end 20 to the top wall 111.

[0059] Of course, the top wall 111 and the side wall 112 of the ceramic cover 11 may also have an integral structure.

[0060] The connection method between the second end portion 32 of the connection member 30 and the first magnetic conductor 40 may be various embodiments such as welding, riveting, and adhesion.

[0061] In this embodiment, the second end portion 32 of the connection member 30 is riveted (fastened) to the first magnetic conductor 40. Specifically, the second end 32 of the connection member 30 and the first magnetic conductor 40 are connected by an expanded rivet method.

[0062] Note that the first magnetic conductor 40 may be linear, and the second magnetic conductor 55 may be U-shaped. The first magnetic conductor 40 and the second magnetic conductor 55 can be made of materials such as iron, cobalt, nickel, and their alloys.

[0063] Of course, it is understood that the second magnetic conductor 55 may include a plurality of laminated magnetic sheets, or the second magnetic conductor 55 may include a plurality of arranged U-shaped magnetic conductors.

[0064] As shown in FIGS. 14 and 16, the seal unit 1400 further includes a metal cover 1410. The metal cover 1410 is connected to the side of the yoke plate 13 facing away from the insulating cover 11a and covers the third through hole 131 on the yoke plate 13. The metal cover 1410 and the yoke plate 13 are surrounded as a chamber for accommodating the fixed core 1230 and the movable core 1240 of the electromagnet unit 1200, which will be described in detail below As shown in FIGS. 4 and 16, the push rod assembly 50 further includes a push rod 51, a base 52, and an elastic member 56. The push rod 51 is movably bored in the third through hole 131 of the yoke plate 13. One end of the push rod 51 is connected to the base 52, and the other end of the push rod 51 is connected to the movable core 1240 of the electromagnet unit 1200. One end of the elastic member 56 abuts against the base 52, and the other end of the elastic member 56 abuts against the movable member 53. The elastic member 56 applies an elastic force so that the movable contact 54 tends to move to the fixed contact lead-out end 20.

[0065] Note that the elastic member 56 may be a spring, but is not limited thereto.

[0066] Of course, in other embodiments, the push rod assembly 50 may have other structures, which will not be enumerated here one by one.

[0067] As shown in FIG. 16, 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 has a hollow cylindrical shape and is formed using an insulating material. The metal cover 1410 is formed through the coil bobbin 1210. The coil 1220 surrounds the coil bobbin 1210. The fixed core 1230 is fixed within the metal cover 1410, and a part of the fixed core 1230 enters the third through hole 131. The fixed core 1230 has a perforation 1231, and the perforation 1231 is provided corresponding to the position of the third through hole 131 and is for passing through the push rod 51. The movable core 1240 is movably provided within the metal cover 1410 and is provided opposite to the fixed core 1230. The movable core 1240 is connected to the push rod 51 and is used to be attracted by the fixed core 1230 when the coil 1220 is energized. The movable core 1240 and the push rod 51 can be connected by screwing, riveting, welding, or other methods.

[0068] The reset member 1250 is located inside the metal cover 1410 and is disposed between the fixed core 1230 and the movable core 1240, and is used to reset the movable core 1240 when the power supply of the coil 1220 is cut off. The reset member 1250 may be a spring and may be externally fitted outside the push rod 51.

[0069] As shown in FIGS. 5 to 8, FIG. 5 shows a schematic side view of the push rod assembly 50 according to the first embodiment of the present invention. FIG. 6 shows an exploded schematic view of FIG. 5. FIG. 7 shows a partial enlarged view at X in FIG. 5. FIG. 8 shows a cross-sectional view taken along line B-B in FIG. 5.

[0070] The push rod assembly 50 further includes a limit structure 57, and the limit structure 57 is connected to the base 52 and the movable member 53 and is used to limit the movement range of the movable member 53 relative to the base 52. The limit structure 57 includes a fitting limit hole 572 and a limit portion 571. The limit hole 572 includes a first end 573 and a second end 574 provided opposite to each other along the movement direction D1 of the movable contact 54. The aperture diameter of the second end 574 is larger than that of the first end 573. The limit portion 571 is movably drilled between the first end 573 and the second end 574 of the limit hole 572. When the movable contact 54 is separated from the fixed contact lead-out end 20, the limit portion 571 is located at the first end 573 of the limit hole 572.

[0071] In this embodiment, the base 52 is directly connected to the movable member 53 via the limit structure 57, which makes the assembly between the base and the movable member 53 easier. Also, since there are no other members above the movable member 53, movement interference between other members and the first magnetic conductor 40 is avoided during over-travel.

[0072] Note that the limit hole 572 may be a through hole or a blind hole.

[0073] When the movable contact 54 is not in contact with the fixed contact lead-out end 20, due to the elastic member 56, the limit portion 571 is located at the first end 573 of the limit hole 572. When the movable contact 54 contacts the fixed contact lead-out end 20 and the over-travel is completed, the limit portion 571 moves from the first end 573 to the second end 574 of the limit hole 572. Since the hole diameter of the second end 574 of the limit hole 572 is larger than that of the first end 573, the limit hole 572 has a structure of "one end is large and the other end is small". During the over-travel process, the gap between the limit portion 571 and the hole wall of the limit hole 572 becomes larger, which can prevent friction and jamming (clogging) from occurring between the limit portion 571 and the hole wall of the limit hole 572 during the movement process of the movable contact 54 relative to the base 52. At the same time, the hole diameter of the first end 573 of the limit hole 572 is small, which does not affect the limit fitting between the limit portion 571 and the limit hole 572 in the initial state, and avoids the movable contact 54 from swinging relative to the base 52.

[0074] Note that in the initial state, in order to realize the limit between the movable contact 54 and the base 52, the size of the hole diameter of the first end 573 of the limit hole 572 should be adapted to the shape of the limit portion 571 so that the limit portion 571 can realize the limit with the hole wall of the limit hole 572 when the limit portion 571 is located at the first end 573 of the limit hole 572.

[0075] Referring to FIGS. 5 to 8, the hole diameter of the limit hole 572 gradually increases in the direction from the first end 573 to the second end 574 of the limit hole 572. During the over-travel, when the limit portion 571 moves from the first end 573 to the second end 574 of the limit hole 572, the gap between the limit portion 571 and the hole wall of the limit hole 572 gradually becomes larger.

[0076] Furthermore, the hole wall of the limit hole 572 includes a first plane 575 and a second plane 576 which are arranged opposite to each other, and a first inclined plane 577 and a second inclined plane 578 which are arranged opposite to each other. One end of the first inclined plane 577 and the second inclined plane 578 is connected to both ends of the first plane 575, and the other end of the first inclined plane 577 and the second inclined plane 578 is connected to both ends of the second plane 576.

[0077] In this embodiment, the shape of the limit hole 572 is substantially an isosceles trapezoid, but it is not limited thereto. For example, the shape of the limit member hole 572 may be a normal trapezoid in which the inclinations of the first inclined plane 577 and the second inclined plane 578 are not equal. Alternatively, the shape of the limit member hole 572 may be a triangle, and an isosceles triangle is preferred.

[0078] Of course, in other embodiments, along the direction from the first end 573 to the second end 574 of the limit hole 572, the hole diameter of the limit hole 572 does not have to gradually increase. For example, the hole wall of the limit hole 572 may include an equal-diameter section and a diameter-expanded section. For example, from the first end 573 to the second end 574, the hole wall of the limit hole 572 can sequentially include a diameter-expanded section, an equal-diameter section, a diameter-expanded section, an equal-diameter section, and the like.

[0079] As shown in FIG. 7, the limit portion 571 has a first arc-shaped surface 571a. The first arc-shaped surface 571a is used to realize the limit between the hole wall of the limit hole 572 when the limit portion 571 is located at the first end portion 573 of the limit hole 572.

[0080] In this embodiment, by designing the outer wall of the limit portion 571 to include the first arc-shaped surface 571a so that a line contact is formed between the first arc-shaped surface 571a and the hole wall of the limit hole 572, the line contact reduces the frictional force between the limit portion 571 and the hole wall of the limit hole 572. When relative movement occurs between the limit portion 571 and the limit hole 572, jamming is less likely to occur.

[0081] The base 52 is provided with a limit member hole 572, and the movable member 53 includes a limit portion 571. Of course, in other embodiments, the limit hole 572 may be provided in the movable member 53, and the limit portion 571 may be provided in the base 52.

[0082] As shown in FIGS. 5 to 8, in this embodiment, the base 52 is provided with a limit hole 572, and the second magnetic conductor 55 is provided with a limit portion 571. The second magnetic conductor 55 includes a bottom portion 551, a first side portion 552, and a second side portion 553. The first side portion 552 and the second side portion 553 are respectively connected to both ends of the bottom portion 551 along the width direction D3 of the movable contact 54. The first side portion 552 and the second side portion 553 are respectively provided on two opposite sides in the width direction D3 of the movable contact 54. A limit portion 571 is provided on each of the first side portion 552 and the second side portion 553.

[0083] It should be noted that any two of the moving direction D1, the longitudinal direction D2, and the width direction D3 are perpendicular to each other.

[0084] The base 52 includes a base portion 521, a first limit member 522 and a second limit member 523 that are connected to and provided opposite to the base portion 521. The first side portion 552 is provided opposite to the first limit member 522, and the second side portion 553 is provided opposite to the second limit member 523. A limit hole 572 is opened in each of the first limit member 522 and the second limit member 523.

[0085] The surface of the first limit member 522 on the side facing the first side portion 552 and the surface of the second limit member 523 on the side facing the second side portion 553 include a second arcuate surface 524.

[0086] In this embodiment, the first limit member 522 is designed such that the side facing the side surface of the first side portion 552 includes a first arc-shaped surface 524, and the second limit member 523 is designed such that the side facing the second side portion 553 includes a second arc-shaped surface 524. By the two second arc-shaped surfaces 524 being in line contact with the first side portion 552 and the second side portion 553 respectively, the frictional force between the first side portion 552 and the first limit member 522, and between the second side portion 553 and the second limit member 523 is reduced due to the line contact. When the second magnetic conductor 55 moves relative to the base 52, jamming is less likely to occur. Also, it is possible to avoid the generation of debris and the contamination of the contact chamber 101 of the relay.

[0087] Between the first limit member 522 and the second limit member 523, the first side portion 552 and the second side portion 553 are located. Limit portions 571 project on both the side where the first side portion 552 is away from the second side portion 553 and the side where the second side portion 553 is away from the first side portion 552.

[0088] As an example, the formation of the limit portion 571 can be achieved by pressing the side surface of the first side portion 552 / second side portion 553 to make the limit portion 571 into a punch structure. The specific position of the punch structure on the first side portion 552 / second side portion 553 can be flexibly adjusted according to the structure.

[0089] In this embodiment, the two limit portions 571 project on the side where the first side portion 552 is away from the second side portion 553 and the side where the second side portion 553 is away from the first side portion 552 respectively, so that the first side portion 552 and the second side portion 553 can be in sufficient contact with the first limit member 522 and the second limit member 523 respectively. Furthermore, the stability during the limiting of the second magnetic conductor 55 and the base 52 is ensured, and the magnetic conduction efficiency is not affected.

[0090] In one embodiment, the limit portion 571 may be elongated. When the limit portion 571 is located at the first end 573 of the limit hole 572, the side surface with a large elongated area contacts the hole wall of the limit hole 572. By bringing the surface with a large area of the limit portion 571 into contact with the hole wall of the limit hole 572, it is effectively avoided that the movable contact 54 swings with respect to the base 52 in the initial state, and the probability of bounce and springback of the movable contact 54 is reduced.

[0091] As shown in FIG. 9, FIG. 9 shows an exploded schematic view of the push rod assembly 50 according to the second embodiment of the present invention. The second embodiment is the same as the first embodiment described above, and the description thereof will be omitted. The differences are as follows.

[0092] The limit portion 571 includes two convex structures. The two convex structures are provided at intervals along the longitudinal direction D2 of the movable contact 54. The design of the double convex structure effectively avoids the movable contact 54 from swinging with respect to the base 52 in the initial state, and reduces the probability of bounce and springback of the movable contact 54.

[0093] As shown in FIG. 10, FIG. 10 is an exploded schematic view of the push rod assembly 50 in the third embodiment of the present invention. The third embodiment is the same as the first embodiment described above, and the description thereof will be omitted. The differences are as follows.

[0094] The limit portion 571 is a rivet 579, and the rivet 579 is riveted to the first side portion 552 / second side portion 553 of the second magnetically conductive body 55.

[0095] As shown in FIG. 11, FIG. 11 is an exploded schematic view of the push rod assembly 50 in the fourth embodiment of the present invention. The fourth embodiment is the same as the first embodiment described above, and the description thereof will be omitted. The difference is that the limit portion 571 is provided at the bottom portion 551 of the second magnetically conductive body 55.

[0096] Specifically, the second magnetic conductor 55 includes a bottom portion 551, a first side portion 552, and a second side portion 553. Along the width direction D3 of the movable contact 54, limit portions 571 project from both opposite sides of the bottom portion 551. The first side portion 552 and the second side portion 553 are respectively connected to both ends of the bottom portion 551 along the width direction D3 of the movable contact 54. The first side portion 552 and the second side portion 553 are respectively provided on two opposite sides in the width direction D3 of the movable contact 54.

[0097] The base 52 includes a base portion 521, a first limit member 522 and a second limit member 523 which are connected to the base portion 521 and arranged opposite to each other, and limit holes 572 are formed in both the first limit member 522 and the second limit member 523.

[0098] As shown in FIG. 12, FIG. 12 is an exploded schematic view of the push rod assembly 50 in the fifth embodiment of the present invention. The points that are the same as those in the first embodiment are omitted in the description, and the differences are as follows.

[0099] The base 52 includes a base portion 521, a first limit member 522 and a second limit member 523 which are connected to the base portion 521 and arranged opposite to each other, and limit holes 572 are formed in both the first limit member 522 and the second limit member 523. The movable member 53 further includes a fixing member 58 fixedly connected to the second magnetic conductor 55, and limit portions 571 are provided on both sides of the fixing member 58.

[0100] As shown in FIG. 13, FIG. 13 is an exploded schematic view of the relay in the second embodiment of the present invention. The points that are the same as those in the first embodiment in the relay of the second embodiment are omitted in the description, and the differences are as follows.

[0101] The limit part 571 protrudes from two opposite sides of the base 52 of the push rod assembly 50. The movable member 53 further includes a fixed member 58 fixedly connected to the movable contact 54 and the second magnetic conductor 55, and a limit hole 572 is provided in the fixed member 58.

[0102] The fixed member 58 is reverse U-shaped, and the positions of the first end 573 and the second end 574 of the limit hole 572 provided in the fixed member 58 are opposite to those of the limit hole 572 in the above-described embodiment.

[0103] Specifically, as shown in FIG. 13, the first end 573 of the limit hole 572 is located below, the second end 574 is located above, and the hole diameter of the second end 574 is larger than the hole diameter of the first end 573.

[0104] As shown in FIGS. 9 to 12, the first end 573 of the limit hole 572 is located above, and the second end 574 is located below.

[0105] In the related art, in order to prevent the contact of the relay from being deflected by the short-circuit current, usually, an interlocking type short-circuit-proof ring electromagnetic structure is installed. Specifically, a first magnetic conductor and a second magnetic conductor are installed in the push rod assembly of the relay. When the short-circuit current generates an electrodynamic repulsive force, the first magnetic conductor generates an electromagnetic attractive force on the second magnetic conductor, and the second magnetic conductor is fixed to the movable contact to ensure that the movable contact cannot be deflected.

[0106] However, the push rod assembly needs to be supported by the holding force of the movable iron core. Since this support force is held by the electromagnetic force generated by the energization of the coil, the power consumption of the coil is limited, the holding force is limited, and the holding force for supporting the short-circuit prevention ring is also limited. Therefore, when the short-circuit current reaches a certain value, the second magnetic conductor also has an electromagnetic attractive force on the first magnetic conductor. If the holding force of the movable iron core cannot support the electromagnetic attractive force of the second magnetic conductor on the first magnetic conductor, the deflection of the contact still occurs. Furthermore, in the related art, the holding force of the movable iron core is increased by enlarging the coil, but when the coil is enlarged, the volume of the relay also increases.

[0107] Therefore, embodiments of the present invention also provide a relay for improving the short-circuit current resistance performance of the relay and avoiding burnout and explosion of the relay due to a strong arc effect.

[0108] The relay in the embodiment of the present invention includes a contact container, a pair of fixed contact lead-out ends, a connecting member, a first magnetic conductor, and a push rod assembly. The contact container has a contact chamber, a pair of first through holes, and one second through hole. Both the first through hole and the second through hole communicate with the contact chamber. The pair of fixed contact lead-out ends are respectively drilled one-to-one in the pair of first through holes and are connected to the contact container. The connecting member is drilled in the second through hole and includes a first end and a second end. The first end is connected to the contact container. The first magnetic conductor is provided in the contact chamber and is connected to the second end of the connecting member. The push rod assembly includes a movable contact and a second magnetic conductor fixedly connected to the movable contact. The movable contact is provided in the contact chamber and is used to contact or separate from the pair of fixed contact lead-out ends. The first magnetic conductor is provided on the side where the movable contact faces the fixed contact lead-out end. The second magnetic conductor is provided in the contact chamber and is located on the side where the movable contact faces away from the first magnetic conductor. The second magnetic conductor is used to form a magnetic conduction circuit with the first magnetic conductor.

[0109] According to some embodiments of the present invention, the second through hole is provided between the pair of first through holes.

[0110] According to some embodiments of the present invention, the contact container includes a yoke plate and an insulating cover. The yoke plate has a third through hole communicating with the contact chamber. The push rod assembly is movably drilled in the third through hole. The insulating cover is connected to the yoke plate. The first through hole and the second through hole are formed in the insulating cover, and a first end of the connecting member is connected to an outer surface of the insulating cover.

[0111] According to some embodiments of the present invention, the insulating cover includes a top wall and side walls. One end of the side walls is connected to an outer periphery of the top wall, and the other end of the side walls is connected to the yoke plate. The first through hole and the second through hole are formed in the top wall.

[0112] According to some embodiments of the present invention, the insulating cover includes a ceramic cover and a flange member. The ceramic cover includes a top wall and side walls. The side walls are connected to the yoke plate via the flange member. On an outer surface of the top wall, a first metallization layer is provided on a periphery located in the first through hole, and a second metallization layer is provided on a periphery located in the second through hole. The fixed contact lead-out end is welded to the top wall via the first metallization layer, and a first end of the connecting member is welded to the top wall via the second metallization layer.

[0113] According to some embodiments of the present invention, the top wall and the side walls are of an integral structure, or the top wall and the side walls are of a separate structure.

[0114] According to some embodiments of the present invention, the first magnetic conductor is provided at a distance from an inner surface of the top wall.

[0115] According to some embodiments of the present invention, a second end of the connecting member is riveted or welded or adhered to the first magnetic conductor.

[0116] According to some embodiments of the present invention, the first magnetic conductor includes a plurality of laminated magnetic conductor pieces, and the plurality of magnetic conductor pieces are connected to a second end of the connecting member.

[0117] According to some embodiments of the present invention, the push rod assembly further includes a base, an elastic member, and a limit structure. One end of the elastic member abuts against the base, and the other end abuts against a movable member composed of the movable contact and the second magnetic conductor. The elastic member supplies an elastic force so that the movable contact tends to move toward the fixed contact lead-out end. The limit structure is connected to the base and the movable member and is used to limit the movement range of the movable member with respect to the base. The limit structure includes a fitting limit hole and a limit portion. The limit hole includes a first end and a second end provided opposite to the moving direction of the movable contact. The limit portion is movably drilled between the first end and the second end of the limit hole. When the movable contact is separated from the fixed contact lead-out end, the limit portion is located at the first end of the limit hole.

[0118] According to some embodiments of the present invention, the aperture diameter of the second end is larger than the aperture diameter of the first end.

[0119] According to some embodiments of the present invention, the limit portion has a first arcuate surface, and the first arcuate surface is used to realize the limit with the limit hole when the limit portion is located at the first end of the limit hole.

[0120] According to some embodiments of the present invention, the limit portion is a rivet, and the rivet is riveted to the second magnetic conductor.

[0121] According to some embodiments of the present invention, the movable member further includes a fixing member fixedly connected to the second magnetic conductor, and the limit portion is provided on one of the fixing member and the base, and the limit hole is provided on the other of the fixing member and the base.

[0122] One embodiment of the above invention has at least the following advantages or beneficial effects.

[0123] The relay according to an embodiment of the present invention is provided with a connecting member, so that the first magnetic conductor is connected to the contact container through the connecting member. The first magnetic conductor is connected to the contact container without being interlocked with the push rod assembly. Thus, the magnetic attraction force of the second magnetic conductor on the first magnetic conductor acts on the contact container through the connecting member, and since the position of the contact container is relatively fixed, it is possible to avoid the movable contact and the fixed contact lead-out end from springing due to the insufficient holding force of the push rod assembly, which may cause burnout and explosion of the relay. On the other hand, a second through hole is formed in the contact container, and the connecting member is formed through the second through hole, further realizing the connection between the connecting member and the contact container and the connection between the first magnetic conductor and the connecting member. The first magnetic conductor connects the contact container through the connecting member, rather than directly connecting to the contact container, and the connection process can be visualized without being blocked, which is convenient for operation and can ensure the reliability of the connection.

[0124] Hereinafter, a detailed description will be given with reference to the drawings.

[0125] As shown in FIGS. 14 to 16, FIG. 14 is an exploded schematic view of the relay according to the first embodiment of the present invention. The relay includes a housing 1100, an electromagnet unit 1200, an arc extinguishing unit 1300, and a sealing unit 1400. The sealing unit 1400 is provided inside the housing 1100, and the top of the fixed contact lead-out end of the sealing unit 1400 is exposed to the outside of the housing 1100 through the exposed hole 1130 of the housing 1100. The electromagnet unit 1200 and the arc extinguishing unit 1300 are provided inside the housing 1100.

[0126] As an example, the housing 1100 includes a first case 1110 and a second case 1120, and the first case 1110 and the second case 1120 are engaged and connected to form a chamber for accommodating the electromagnet unit 1200, the arc extinguishing unit 1300, and the sealing unit 1400.

[0127] The arc extinguishing unit 1300 is used to extinguish the arc generated between the fixed contact lead-out end of the sealing unit 1400 and the movable contact.

[0128] 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 parallelepiped. The two arc extinguishing magnets 1310 are respectively provided on both sides of the insulating cover and are provided opposite to each other along the longitudinal direction D2 of the movable contact.

[0129] By providing the two arc extinguishing magnets 1310 provided opposite to each other, a magnetic field can be formed around the fixed contact lead-out end and the movable contact. Therefore, the arc generated between the fixed contact lead-out end and the movable contact is stretched in a direction away from each other by the action of the magnetic field, and arc extinguishing is realized.

[0130] The arc extinguishing unit 1300 further includes two yoke clamps 1320 arranged corresponding to the positions of the two arc extinguishing magnets 1310. And the two yoke clamps 1320 surround the sealing unit 1400 and the two arc extinguishing magnets 1310. By the design around the arc extinguishing magnet 1310 by the yoke clamp 1320, it is possible to avoid the magnetic field by the arc extinguishing magnet 1310 from diffusing to the outside and affecting the arc extinguishing effect. The yoke clamp 1320 is made of a soft magnetic material. Examples of the soft magnetic material include, but are not limited to, iron, cobalt, nickel, and their alloys.

[0131] As shown in FIGS. 1 to 4, FIGS. 15 and 16, FIG. 1 is a perspective schematic view of a relay in a first embodiment of the present invention, where the coil and the magnetic circuit are omitted. FIG. 2 shows a plan schematic view of FIG. 1. FIG. 3 shows a sectional view taken along line A-A in FIG. 2. FIG. 4 shows an exploded schematic view of FIG. 1. FIG. 15 shows a perspective schematic view of FIG. 1 with the insulating cover omitted. FIG. 16 shows a sectional view taken along line C-C in FIG. 2.

[0132] The seal unit 1400 according to an embodiment of the present invention includes a contact container 10, a pair of fixed contact terminals 20, a connection member 30, a first magnetic conductor 40, and a push rod assembly 50. The contact container 10 has a contact chamber 101, a pair of first through holes 102, and one second through hole 103. Both the first through hole 102 and the second through hole 103 communicate with the contact chamber 101. The pair of fixed contact terminals 20 are connected to the contact container 10 and are respectively formed in the pair of first through holes 102 one by one. The connection member 30 is formed in the second through hole 103 and includes a first end 31 and a second end 32. The first end 31 is connected to the container wall of the contact container 10. The first magnetic conductor 40 is provided in the contact chamber 101 and is connected to the second end 32 of the connection member 30. The push rod assembly 50 includes a movable contact 54 and a second magnetic conductor 55 fixedly connected to the movable contact 54. The movable contact 54 is provided in the contact chamber 101 and is used to contact or separate from the pair of fixed contact terminals 20. The first magnetic conductor 40 is provided on the side where the movable contact 54 faces the fixed contact terminal 20. The second magnetic conductor 55 is provided in the contact chamber 101 and is located on the side where the movable contact 54 faces away from the first magnetic conductor 40. The second magnetic conductor 55 is used to form a magnetic conduction circuit with the first magnetic conductor 40.

[0133] In addition, in the relay according to the embodiment of the present invention, when the movable contact 54 is provided between the first magnetic conductor 40 and the second magnetic conductor 55 and both ends of the movable contact 54 contact the pair of fixed contact terminals 20, the second magnetic conductor 55 that moves together with the movable contact 54 approaches or contacts the first magnetic conductor 40, thereby forming a magnetic conduction circuit that surrounds the movable contact 54 between the first magnetic conductor 40 and the second magnetic conductor 55. When a short-circuit current passes through the movable contact 54, a magnetic attraction force along the pressure direction of the contact is generated between the first magnetic conductor 40 and the second magnetic conductor 55. This magnetic attraction force resists the electro-dynamic repulsive force caused by the short-circuit current between the movable contact 54 and the fixed contact terminal 20, ensuring that the movable contact 54 and the fixed contact terminal 20 do not bounce off.

[0134] As shown in FIG. 16, when both ends of the movable contact 54 are disconnected from the pair of fixed contact leads 20, no current flows through the movable contact 54, so no magnetic attraction force is generated between the first magnetic conductor 40 and the second magnetic conductor 55.

[0135] In the relay according to the embodiment of the present invention, by providing the connection member 30, the first magnetic conductor 40 is connected to the contact container 10 via the connection member 30. The first magnetic conductor 40 is connected to the contact container 10 without being interlocked with the push rod assembly 50, and the magnetic attraction force of the second magnetic conductor 55 on the first magnetic conductor 40 acts on the contact container 10 via the connection member 30. Since the position of the contact container 10 is relatively fixed, it is possible to avoid the problem that the holding force of the push rod assembly 50 is insufficient and the movable contact 54 and the fixed contact lead 20 bounce, causing burnout and explosion of the relay. On the other hand, a second through hole 103 is formed in the contact container 10, and the connection member 30 is formed through the second through hole 103 so that the connection member 30 is connected to the contact container 10 and the first magnetic conductor 40 is connected to the connection member 30. The first magnetic conductor 40 is connected to the contact container 10 via the connection member 30, but is not directly connected to the contact container 10, and can be visualized without obstructing the connection process, is easy to operate, and can ensure the reliability of the connection.

[0136] It should be noted that the terms "comprising" and "having" in the embodiments of the present invention are intended to cover non-exclusive inclusion and mean any modification thereof. For example, a process, method, system, product or device including a series of steps or units is not limited to the recited steps or units, and may optionally include steps or units not listed, or optionally, other steps or components specific to these processes, methods, products or devices.

[0137] The contact container 10 includes a yoke plate 13 and an insulating cover 11a. The insulating cover 11a covers the side surface of the yoke plate 13 to form the contact chamber 101 of the contact container 10. In one embodiment, the insulating cover 11a includes a top wall and a side wall, and a first through hole 102 and a second through hole 103 are formed in the top wall. The yoke plate 13 has a third through hole 131 communicating with the contact chamber 101, and the push rod assembly 50 is movably inserted into the third through hole 131. Two yoke clamps 1320 surround the insulating cover 11a.

[0138] The insulating cover 11a includes a ceramics cover 11 and a flange member 12. The ceramics cover 11 is connected to the yoke plate 13 via the flange member 12. The flange member 12 can form a metal part with an annular structure such as an iron-nickel alloy, and one end thereof is connected to the opening edge of the ceramics cover 11 by laser welding, brazing, resistance welding, adhesion or the like. The other end of the flange member 12 is connected to the yoke plate 13, and may be similarly laser welding, brazing, resistance welding, adhesion or the like. A flange member 12 is provided between the ceramics cover 11 and the yoke plate 13, which can facilitate the connection between the ceramics cover 11 and the yoke plate 13.

[0139] Two arc extinguishing magnets 1310 are respectively located on both sides of the ceramics cover 11, and two yoke clamps 1320 surround the ceramics cover 11 and the two arc extinguishing magnets 1310.

[0140] The ceramics cover 11 includes a top wall 111 and a side wall 112. One end of the side wall 112 is surrounded and connected to the outer periphery of the top wall 111, and the other end of the side wall 112 is connected to the yoke plate 13 via the flange member 12. Both the first through hole 102 and the second through hole 103 are formed in the top wall 111, and the first end 31 of the connecting member 30 is connected to the outer surface of the top wall 111.

[0141] Note that one of the pair of fixed contact leads 20 functions as the current-inflow terminal and the other functions as the current-outflow terminal. The fixed contact lead 20 is formed through the first through-hole 102, and a part of the fixed contact lead 20 enters the contact chamber 101 to contact or separate from the movable contact 54. A part of the fixed contact lead 20 is exposed on the outer surface of the ceramic cover 11.

[0142] The bottom of the fixed contact lead 20 serves as the fixed contact, and the movable contact 54 can have movable contacts at both ends in its longitudinal direction D2. The movable contacts at both ends of the movable contact 54 may protrude from other parts of the movable contact 54 or may coincide with other parts.

[0143] Note that the fixed contact may be provided integrally or separately at the bottom of the fixed contact lead 20, and the movable contact may be provided integrally or separately at both ends in the longitudinal direction D2 of the movable contact 54.

[0144] The second through-hole 103 is provided between the two first through-holes 102, that is, the connecting member 30 may be provided between the pair of fixed contact leads 20. The number of the second through-holes 103 may be one or more. In this embodiment, the number of the second through-holes 103 is two, but it is not limited thereto.

[0145] Correspondingly, the number of the connecting members 30 may be one or more. In this embodiment, the number of the connecting members 30 is two, but it is not limited thereto.

[0146] Referring to FIG. 4, on the outer surface of the top wall 111 of the ceramic cover 11, a first metallization layer 113 is provided at the periphery located in the first through-hole 102, and a second metallization layer 114 is provided at the periphery located in the second through-hole 103. The fixed contact lead 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.

[0147] The outer surface of the top wall 111 of the ceramic cover 11 is more likely to form a welding plane than the inner surface of the ceramic cover 11. Also, it is necessary to provide the fixed contact lead-out end 20 on the top wall 111 of the ceramic cover 11. When welding the fixed contact lead-out end 20 and the top wall 111, it is also necessary to provide a metallization layer on the periphery of the first through-hole 102. Therefore, when processing the first metallization layer 113 of the first through-hole 102, the second metallization layer 114 of the second through-hole 103 is processed together. Thus, by welding the connecting member 30 to the outer surface of the top wall 111 of the ceramic cover 11, it is possible to process the metallization layer only on the outer surface of the top wall 111 without the need to process the metallization layer on the inner surface of the top wall 111. The processing is easy and the processing process is also simplified.

[0148] The first magnetic conductor 40 is provided at a distance from the inner surface of the top wall 111. That is, the length of the connecting member 30 is greater than the sum of the thickness of the top wall 111 and the thickness of the first magnetic conductor 40 so that the first magnetic conductor 40 is suspended from the top wall 111 of the ceramic cover 11 via the connecting member 30.

[0149] The first magnetic conductor 40 has a gap with the inner surface of the top wall 111, so that it is provided at a distance from the inner surface of the top wall 111. Since the first magnetic conductor 40 is not in direct contact with the inner surface of the top wall 111, it does not affect the creepage distance between the pair of fixed contact lead-out ends 20.

[0150] Furthermore, referring to FIGS. 3 and 4, the first magnetic conductor 40 includes a plurality of laminated magnetic conductor sheets 41 connected to the second end 32 of the connecting member 30. Each magnetic conductor sheet 41 is provided with an opening 411. The connecting member 30 is drilled through the opening 411 and riveted (fastened) to the lowermost magnetic conductor sheet 41.

[0151] Of course, when the first magnetic conductor 40 includes a plurality of magnetic conductor sheets 41 laminated thereon, the through-hole 411 of the lowermost magnetic conductor sheet 41 may be a blind hole, and the through-holes 411 of the remaining magnetic conductor sheets 41 may be through-holes. The connecting member 30 is drilled through each through-hole 411 of the remaining magnetic conductor sheets 41, and the second end of the connecting member 30 enters into the blind hole of the lowermost magnetic conductor sheet 41 and is welded to this magnetic conductor sheet 41.

[0152] Also, when there is one first magnetic conductor 40, the first magnetic conductor 40 is provided with a through-hole 411, and the through-hole 411 may be a through-hole or a blind hole. When the through-hole 411 is a through-hole, after passing through the through-hole 411, the connecting member 30 is riveted to the first magnetic conductor 40. When the through-hole 411 is a blind hole, solder is provided in the blind hole, and the second end 32 of the connecting member 30 enters into the blind hole and may be welded to the first magnetic conductor 40.

[0153] As an example, when the short-circuit current is 10 kA or more, in order to generate a larger magnetic attraction force, it is necessary to increase the thickness of the first magnetic conductor 40. Furthermore, it is necessary to ensure that the magnetic attraction force between the first magnetic conductor 40 and the second magnetic conductor 55 overcomes the repulsive force due to the short-circuit current and prevents the movable contact 54 from bouncing away from the fixed contact lead-out end 20. However, a first magnetic conductor 40 with a large thickness has a high cost and is difficult to connect to the ceramic cover 11.

[0154] In this embodiment, since the first magnetic conductor 40 is connected to the contact container 10 via the connecting member 30, the first magnetic conductor 40 can include a plurality of laminated magnetic conductor sheets 41, and the through-holes 411 of the plurality of magnetic conductor sheets 41 can be drilled and connected via the connecting member 30. By increasing the number of thin magnetic conductor sheets 41, the overall thickness of the first magnetic conductor 40 can be increased. The magnetic conductor sheet 41 has a small thickness and can be made of a thin material, so the material cost is low and it is easy to operate. On the other hand, the number of magnetic conductor sheets 41 can be flexibly adjusted according to the magnitude of the short-circuit current.

[0155] The top wall 111 and the side wall 112 of the ceramic cover 11 may have a separate structure or may be connected by welding. Note that by designing the ceramic cover 11 as a separate structure of the top wall 111 and the side wall 112, the connection between the connecting member 30 and the top wall 111 becomes easier. Of course, the top wall 111 and the side wall 112 may be connected by adhesion.

[0156] Specifically, since the top wall 111 is in a sheet shape, it is easier 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-like structure also facilitates the welding of the connecting member 30 to the top wall 111 and the fixed contact lead-out end 20 to the top wall 111.

[0157] Of course, the top wall 111 and the side wall 112 of the ceramic cover 11 may have an integral structure.

[0158] The connection method between the second end 32 of the connecting member 30 and the first magnetic conductor 40 may be various embodiments such as welding, riveting, and adhesion.

[0159] In this embodiment, the second end 32 of the connecting member 30 is riveted (fastened) to the first magnetic conductor 40. Specifically, the second end 32 of the connecting member 30 and the first magnetic conductor 40 are connected by an expanded rivet method.

[0160] Note that the first magnetic conductor 40 may be in a straight shape, and the second magnetic conductor 55 may be in a U shape. The first magnetic conductor 40 and the second magnetic conductor 55 can be made of materials such as iron, cobalt, nickel, and their alloys.

[0161] Of course, it is understood that the second magnetic conductor 55 may include a plurality of laminated magnetic sheets, or the second magnetic conductor 55 may include a plurality of U-shaped magnetic conductors arranged side by side.

[0162] As shown in FIGS. 14 and 16, the seal unit 1400 further includes a metal cover 1410. The metal cover 1410 is connected to the side of the yoke plate 13 facing away from the insulating cover 11a and covers the third through hole 131 on the yoke plate 13. The metal cover 1410 and the yoke plate 13 are surrounded as a chamber for accommodating the fixed core 1230 and the movable core 1240 of the electromagnetic unit 1200, which will be described in detail below.

[0163] As shown in FIGS. 4 and 16, the push rod assembly 50 further includes a push rod 51, a base 52, and an elastic member 56. The push rod 51 is movably inserted into the third through hole 131 of the yoke plate 13. One end of the push rod 51 is connected to the base 52, and the other end of the push rod 51 is connected to the movable core 1240 of the electromagnetic unit 1200. One end of the elastic member 56 abuts against the base 52, and the other end of the elastic member 56 abuts against a movable member 53 composed of a movable contact 54 and a second magnetic conductor 55. The elastic member 56 applies an elastic force so that the movable contact 54 tends to move to the fixed contact lead-out end 20.

[0164] Note that the elastic member 56 may be a spring, but is not limited thereto.

[0165] Of course, in other embodiments, the push rod assembly 50 may have other structures, which will not be enumerated here one by one.

[0166] As shown in Fig. 16, 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 has a hollow cylindrical shape and is formed using an insulating material. The metal cover 1410 is bored within the coil bobbin 1210. The coil 1220 surrounds the coil bobbin 1210. The fixed core 1230 is fixedly installed within the metal cover 1410, and a part of the fixed core 1230 enters the third through hole 131. The fixed core 1230 has a perforation 1231, which is provided corresponding to the position of the third through hole 131 and is for boring the push rod 51. The movable core 1240 is movably provided within the metal cover 1410, is provided opposite to the fixed core 1230, and is connected to the push rod 51 and is used to be attracted to the fixed core 1230 when the coil 1220 is energized. The movable core 1240 and the push rod 51 can be connected by screwing, riveting, welding, or other methods.

[0167] The reset member 1250 is located inside the metal cover 1410, is disposed between the fixed core 1230 and the movable core 1240, and is used to reset the movable core 1240 when the power supply of the coil 1220 is cut off. The reset member 1250 may be a spring and may be externally fitted outside the push rod 51.

[0168] As shown in Figs. 5 to 8, Fig. 5 shows a schematic side view of the push rod assembly 50 according to the first embodiment of the present invention. Fig. 6 shows an exploded schematic view of Fig. 5. Fig. 7 shows a partially enlarged view at X in Fig. 5. Fig. 8 shows a cross-sectional view taken along line B - B in Fig. 5.

[0169] The push rod assembly 50 further includes a limit structure 57, and the limit structure 57 is connected to the base 52 and the movable member 53 and is used to limit the moving range of the movable member 53 relative to the base 52. The limit structure 57 includes a mating limit hole 572 and a limit portion 571. The limit hole 572 includes a first end 573 and a second end 574 provided opposite to each other along the moving direction D1 of the movable contact 54. The aperture diameter of the second end 574 is larger than that of the first end 573. The limit portion 571 is movably drilled between the first end 573 and the second end 574 of the limit hole 572. When the movable contact 54 is separated from the fixed contact lead-out end 20, the limit portion 571 is located at the first end 573 of the limit hole 572.

[0170] In this embodiment, the base 52 is directly connected to the movable member 53 through the limit structure 57, which makes the assembly between the base and the movable member 53 easier. Also, since there are no other members above the movable member 53, the movement interference between other members and the first magnetic conductor 40 is avoided during overtravel.

[0171] It should be noted that the limit hole 572 may be a through hole or a blind hole.

[0172] When the movable contact 54 is not in contact with the fixed contact lead-out end 20, due to the elastic member 56, the limiting portion 571 is located at the first end 573 of the limiting hole 572. During the process when the movable contact 54 comes into contact with the fixed contact lead-out end 20 and overtravel is completed, the limiting portion 571 moves from the first end 573 to the second end 574 of the limiting hole 572. Since the hole diameter of the second end 574 of the limiting hole 572 is larger than that of the first end 573, the limiting hole 572 presents a structure of "one end is large and the other end is small". During the overtravel process, the gap between the limiting portion 571 and the hole wall of the limiting hole 572 becomes larger, which can prevent friction and jamming from occurring between the limiting portion 571 and the hole wall of the limiting hole 572 during the movement process of the movable contact 54 relative to the base 52. At the same time, the hole diameter of the first end 573 of the limiting hole 572 is small, which does not affect the fitting of the limiting portion 571 and the limiting of the limiting hole 572 in the initial state, and avoids the movable contact 54 from swinging relative to the base 52.

[0173] In addition, in the initial state, in order to realize the limitation between the movable contact 54 and the base 52, the size of the hole diameter of the first end 573 of the limiting hole 572 should conform to the shape of the limiting portion 571 so that the limiting portion 571 can realize the limitation with the hole wall of the limiting hole 572 when the limiting portion 571 is located at the first end 573 of the limiting hole 572.

[0174] Referring to FIGS. 5 to 8, the hole diameter of the limiting hole 572 gradually increases in the direction from the first end 573 to the second end 574 of the limiting hole 572. During overtravel, during the process when the limiting portion 571 moves from the first end 573 to the second end 574 of the limiting hole 572, the gap between the limiting portion 571 and the hole wall of the limiting hole 572 gradually becomes larger.

[0175] Furthermore, the hole wall of the limit hole 572 includes a first plane 575 and a second plane 576 arranged opposite to each other, and a first inclined surface 577 and a second inclined surface 578 arranged opposite to each other. One end of the first inclined surface 577 and the second inclined surface 578 is connected to both ends of the first plane 575, and the other end of the first inclined surface 577 and the second inclined surface 578 is connected to both ends of the second plane 576.

[0176] In this embodiment, the shape of the limit hole 572 is substantially an isosceles trapezoid, but it is not limited thereto. For example, the shape of the limit member hole 572 may be an ordinary trapezoid in which the inclinations of the first inclined surface 577 and the second inclined surface 578 are not equal. Alternatively, the shape of the limit member hole 572 may be a triangle, and an isosceles triangle is preferred.

[0177] Of course, in other embodiments, along the direction from the first end 573 to the second end 574 of the limit hole 572, the hole diameter of the limit hole 572 does not have to gradually increase. For example, the hole wall of the limit hole 572 may include an equal-diameter section and a diameter-increasing section. For example, from the first end 573 to the second end 574, the hole wall of the limit hole 572 can sequentially include a diameter-increasing section, an equal-diameter section, a diameter-increasing section, an equal-diameter section, and the like.

[0178] As shown in FIG. 7, the limit portion 571 has a first arcuate surface 571a, and the first arcuate surface 571a is used to realize the limit with the hole wall of the limit hole 572 when the limit portion 571 is located at the first end portion 573 of the limit hole 572.

[0179] In this embodiment, by designing the outer wall of the limit portion 571 to include the first arcuate surface 571a so that the first arcuate surface 571a and the hole wall of the limit hole 572 are in line contact, the line contact reduces the frictional force between the limit portion 571 and the hole wall of the limit hole 572. When relative movement occurs between the limit portion 571 and the limit hole 572, jamming is less likely to occur.

[0180] The base 52 is provided with a limit member hole 572, and the movable member 53 includes a limit portion 571. Of course, in other embodiments, the limit hole 572 may be provided in the movable member 53, and the limit portion 571 may be provided in the base 52.

[0181] As shown in FIGS. 5 to 8, in this embodiment, the base 52 is provided with a limit hole 572, and the second magnetic conductor 55 is provided with a limit portion 571. The second magnetic conductor 55 includes a bottom portion 551, a first side portion 552, and a second side portion 553. The first side portion 552 and the second side portion 553 are respectively connected to both ends of the bottom portion 551 along the width direction D3 of the movable contact 54. The first side portion 552 and the second side portion 553 are respectively provided on two opposite sides of the movable contact 54 in the width direction D3. The limit portion 571 is provided on both the first side portion 552 and the second side portion 553.

[0182] It should be noted that any two of the moving direction D1, the longitudinal direction D2, and the width direction D3 are perpendicular to each other.

[0183] The base 52 includes a base portion 521, a first limit member 522 and a second limit member 523 that are connected to the base portion 521 and provided opposite to each other. The first side portion 552 is provided opposite to the first limit member 522, and the second side portion 553 is provided opposite to the second limit member 523. The limit hole 572 is opened in both the first limit member 522 and the second limit member 523.

[0184] The surface of the first limit member 522 on the side facing the first side portion 552 and the surface of the second limit member 523 on the side facing the second side portion 553 include a second arcuate surface 524.

[0185] In this embodiment, the first limit member 522 is designed such that the side surface facing the side surface of the first side portion 552 includes an arc-shaped surface 524, and the second limit member 523 includes a second arc-shaped surface 524 on the side surface facing the second side portion 553. By the two second arc-shaped surfaces 524 being in line contact with the first side portion 552 and the second side portion 553 respectively, due to the line contact, the frictional force between the first side portion 552 and the first limit member 522, and between the second side portion 553 and the second limit member 523 is reduced. When the second magnetic conductor 55 moves relative to the base 52, jamming is less likely to occur. Also, it is possible to avoid the generation of debris and the contamination of the contact chamber 101 of the relay.

[0186] Between the first limit member 522 and the second limit member 523, the first side portion 552 and the second side portion 553 are located. Limit portions 571 project on both the side where the first side portion 552 is away from the second side portion 553 and the side where the second side portion 553 is away from the first side portion 552.

[0187] As an example, for the formation of the limit portion 571, the side surfaces of the first side portion 552 / the second side portion 553 can be pressed to form the limit portion 571 into a punch structure. The specific position of the punch structure on the first side portion 552 / the second side portion 553 can be flexibly adjusted according to the structure.

[0188] In this embodiment, the two limit portions 571 project on the side where the first side portion 552 is away from the second side portion 553 and the side where the second side portion 553 is away from the first side portion 552 respectively, enabling the first side portion 552 and the second side portion 553 to come into sufficient contact with the first limit member 522 and the second limit member 523 respectively. Furthermore, the stability during the limiting of the second magnetic conductor 55 and the base 52 is ensured, without affecting the magnetic conduction efficiency.

[0189] In one embodiment, the limit portion 571 may be elongated. When the limit portion 571 is located at the first end 573 of the limit hole 572, the side surface with a large elongated area contacts the hole wall of the limit hole 572. By bringing the surface with a large area of the limit portion 571 into contact with the hole wall of the limit hole 572, it is effectively avoided that the movable contact 54 swings with respect to the base 52 in the initial state, and the probability of bounce and springback of the movable contact 54 is reduced.

[0190] As shown in FIG. 9, FIG. 9 shows an exploded schematic view of the push rod assembly 50 according to the second embodiment of the present invention. The second embodiment is the same as the first embodiment described above, and the description thereof will be omitted. The differences are as follows.

[0191] The limit portion 571 includes two convex structures. The two convex structures are provided at intervals along the longitudinal direction D2 of the movable contact 54. The design of the double convex structure effectively avoids the movable contact 54 from swinging with respect to the base 52 in the initial state, and reduces the probability of bounce and springback of the movable contact 54.

[0192] As shown in FIG. 10, FIG. 10 is an exploded schematic view of the push rod assembly 50 according to the third embodiment of the present invention. The third embodiment is the same as the first embodiment described above, and the description thereof will be omitted. The differences are as follows.

[0193] The limit portion 571 is a rivet 579, and the rivet 579 is riveted to the first side portion 552 / second side portion 553 of the second magnetic conductor 55.

[0194] As shown in FIG. 11, FIG. 11 is an exploded schematic view of the push rod assembly 50 according to the fourth embodiment of the present invention. The fourth embodiment is the same as the first embodiment described above, and the description thereof will be omitted. The difference is that the limit portion 571 is provided at the bottom portion 551 of the second magnetic conductor 55.

[0195] Specifically, the second magnetic conductor 55 includes a bottom portion 551, a first side portion 552, and a second side portion 553. Along the width direction D3 of the movable contact 54, limit portions 571 project from two opposite sides of the bottom portion 551. The first side portion 552 and the second side portion 553 are respectively connected to both ends of the bottom portion 551 along the width direction D3 of the movable contact 54. The first side portion 552 and the second side portion 553 are respectively provided on two opposite sides in the width direction D3 of the movable contact 54.

[0196] The base 52 includes a base portion 521, a first limit member 522 and a second limit member 523 which are connected to the base portion 521 and arranged opposite to each other. Limit holes 572 are formed in both the first limit member 522 and the second limit member 523.

[0197] As shown in FIG. 12, FIG. 12 is an exploded schematic view of the push rod assembly 50 in the fifth embodiment of the present invention. The points that are the same as those in the first embodiment are omitted in the description, and the differences are as follows.

[0198] The base 52 includes a base portion 521, a first limit member 522 and a second limit member 523 which are connected to the base portion 521 and arranged opposite to each other. Limit holes 572 are formed in both the first limit member 522 and the second limit member 523. The movable member 53 further includes a fixing member 58 fixedly connected to the second magnetic conductor 55, and limit portions 571 are provided on both sides of the fixing member 58.

[0199] As shown in FIG. 13, FIG. 13 is an exploded schematic view of the relay in the second embodiment of the present invention. The points that are the same as those in the first embodiment of the relay are omitted in the description, and the differences are as follows.

[0200] The limiting part 571 protrudes from two opposite sides of the base 52 of the push rod assembly 50. The movable member 53 further includes a fixed member 58 fixedly connected to the movable contact 54 and the second magnetic conductor 55, and a limiting hole 572 is provided in the fixed member 58.

[0201] The fixed member 58 is reverse U-shaped, and the positions of the first end 573 and the second end 574 of the limiting hole 572 provided in the fixed member 58 are opposite to those of the limiting hole 572 in the above-described embodiment.

[0202] Specifically, as shown in FIG. 13, the first end 573 of the limiting hole 572 is located below, the second end 574 is located above, and the hole diameter of the second end 574 is larger than that of the first end 573.

[0203] As shown in FIGS. 9 to 12, the first end 573 of the limiting hole 572 is located above, and the second end 574 is located below.

[0204] It should be noted that the various embodiments / examples provided by the present invention can be combined with each other without contradiction, and the description thereof is omitted here.

[0205] In the embodiments of the invention, the terms "first", "second", and "third" are used only for the purpose of description and are not understood as indicating or implying relative importance. The terms "a pair" and "one" are used only for drawing out technical features, and should not be understood as a specific number limitation of the technical features unless specifically limited. The term "a plurality" means two or more unless specifically limited. Terms such as "mounted", "contacted", "connected", and "fixed" should be understood in a broad sense. For example, "connected" may be a fixed connection, a removable connection, or an integral connection. "Contacted" can be either a direct connection or an indirect connection through an intermediate medium. The specific meanings of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

[0206] In the description of the embodiments of the present invention, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", and "rear" is the orientation or positional relationship based on the drawings, and is merely for facilitating the description and simplification of the description of the embodiments of the present invention, and does not indicate or imply that the indicated device or unit needs to have a specific direction for being configured and operating in a specific orientation, and should not be understood as a limitation to the embodiments of the invention.

[0207] In the description of this specification, the descriptions of terms such as "one embodiment", "several embodiments", and "specific embodiment" mean that the specific features, structures, materials, or characteristics described in relation to this embodiment or example are included in at least one embodiment or example of the embodiments of the invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0208] The above are only preferred embodiments of the embodiments of the invention and are not used to limit the embodiments of the invention. For those skilled in the art, the embodiments of the invention can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the invention should be included in the protection scope of the embodiments of the invention.

Claims

1. A relay comprising a contact container, a pair of fixed contact lead-out terminals, a connecting member, a first magnetic conductor, and a push rod assembly, wherein the contact container has a contact chamber, a pair of first through-holes and second through-holes, and both the first through-hole and the second through-hole communicate with the contact chamber, the pair of fixed contact lead-out terminals are respectively disposed in the pair of first through-holes in a one-to-one manner and are connected to the contact container, the connecting member is disposed in the second through-hole and includes a first end and a second end, and the first end is connected to the contact container, the first magnetic conductor is provided in the contact chamber and is connected to the second end of the connecting member, the push rod assembly includes a movable contact and a second magnetic conductor fixedly connected to the movable contact, the movable contact is provided in the contact chamber and is used to contact or separate from the pair of fixed contact lead-out terminals, the first magnetic conductor is provided on the side where the movable contact faces the fixed contact lead-out terminals, the second magnetic conductor is provided in the contact chamber and is located on the side where the movable contact faces away from the first magnetic conductor, and the second magnetic conductor is used to form a magnetic conduction circuit with the first magnetic conductor. The relay is characterized by this.

2. The second through-hole is provided between the pair of first through-holes. The relay according to claim 1, characterized by this.

3. The contact container includes a yoke plate and an insulating cover, the yoke plate has a third through-hole communicating with the contact chamber, and the push rod of the push rod assembly is movably disposed in the third through-hole, the insulating cover is connected to the yoke plate, and the insulating cover and the yoke plate surround the contact chamber, the first through-hole and the second through-hole are opened in the insulating cover, and the first end of the connecting member is connected to the outer surface of the insulating cover. The relay according to claim 1, characterized by this.

4. 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 surrounded and connected to the outer periphery of the top wall, and the other end of the side wall is connected to the yoke plate through the flange member. The first through-hole and the second through-hole are opened in the top wall. On the outer surface of the top wall, a first metallization layer is provided on the periphery located at the first through hole, and a second metallization layer is provided on the periphery located at the second through hole. The fixed contact lead-out 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. The relay according to claim 3, characterized in that.

5. The top wall and the side wall are of an integral structure or the top wall and the side wall are of a separate structure. The relay according to claim 4, characterized in that.

6. The first magnetic conductor is provided at a distance from the inner surface of the top wall. The relay according to claim 4, characterized in that.

7. The second end of the connecting member is riveted or welded or adhered to the first magnetic conductor. The relay according to claim 1, characterized in that.

8. The first magnetic conductor includes a magnetic conductive piece, and an opening is formed in the magnetic conductive piece. The connecting member is passed through the opening and is connected to the magnetic conductive piece. The relay according to claim 1, characterized in that.

9. The first magnetic conductor includes a plurality of laminated magnetic conductive pieces. The connecting member is passed through the openings of the plurality of magnetic conductive pieces, and the second end of the connecting member is connected to the magnetic conductive piece located at the lowermost position. The relay according to claim 8.

10. The push rod assembly further includes a base, an elastic member, and a limiting structure. One end of the elastic member abuts against the base, and the other end abuts against a movable member composed of the movable contact and the second magnetic conductor. The elastic member supplies an elastic force so that the movable contact tends to move toward the fixed contact lead-out end. The limiting structure is connected to the base and the movable member and is used to limit the movement range of the movable member with respect to the base. The limiting structure includes a fitting limiting hole and a limiting portion. The limiting hole includes a first end and a second end provided opposite to the moving direction of the movable contact. The limiting portion is movably passed through between the first end and the second end of the limiting hole. When the movable contact is separated from the fixed contact lead-out end, the limiting portion is located at the first end of the limiting hole. The relay according to claim 1.

11. The aperture diameter of the second end is larger than the aperture diameter of the first end. The relay according to claim 10.

12. The limiting part has a first arcuate surface, and the first arcuate surface is used to achieve limitation with the limiting hole when the limiting part is located at the first end of the limiting hole. The relay according to claim 10.

13. The limiting part is a rivet, and the relay according to claim 11, wherein the rivet is riveted to the second magnetic conductor.

14. The movable member further includes a fixing member fixedly connected to the second magnetic conductor, the limiting part is provided on one of the fixing member and the base, and the limiting hole is provided on the other of the fixing member and the base. The relay according to claim 10.

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