WO2025167724A1 - Relais - Google Patents

Relais

Info

Publication number
WO2025167724A1
WO2025167724A1 PCT/CN2025/074618 CN2025074618W WO2025167724A1 WO 2025167724 A1 WO2025167724 A1 WO 2025167724A1 CN 2025074618 W CN2025074618 W CN 2025074618W WO 2025167724 A1 WO2025167724 A1 WO 2025167724A1
Authority
WO
WIPO (PCT)
Prior art keywords
movable contact
magnetic
magnetic conductive
movable
relay according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2025/074618
Other languages
English (en)
Chinese (zh)
Inventor
苏礼季
吴祝雄
代文广
钟叔明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Hongfa Electric Power Controls Co Ltd
Original Assignee
Xiamen Hongfa Electric Power Controls Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiamen Hongfa Electric Power Controls Co Ltd filed Critical Xiamen Hongfa Electric Power Controls Co Ltd
Publication of WO2025167724A1 publication Critical patent/WO2025167724A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H01H50/42—Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement

Definitions

  • the present application relates to the technical field of electric control devices, in particular to a relay.
  • a relay is an electronic control device with a control circuit (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits.
  • a relay is essentially an "automatic switch” that uses a smaller current to control a larger one. Therefore, it plays a role in automatic regulation, safety protection, and circuit switching.
  • a high-voltage DC relay is a type of relay consisting of a pair of stationary contacts and multiple moving contacts. Each moving contact contacts a pair of stationary contacts to close the relay.
  • the moving contacts of the high-voltage DC relay can spring open due to the electrodynamic repulsion generated by the short-circuit current. This instantaneous springing of the moving contacts can cause the relay to burn out or explode due to the strong arcing.
  • an anti-short-circuit structure In conventional technology, to prevent relay contacts from bouncing open under short-circuit current, an anti-short-circuit structure is typically implemented.
  • This anti-short-circuit structure includes a first magnetic conductor positioned on the side of the moving contact facing the stationary contact. When power is applied to the moving contact, the first magnetic conductor becomes magnetized, generating an attractive force in the direction of contact pressure. This attractive force counteracts the electrodynamic repulsive force between the moving and stationary contacts caused by the short-circuit current, preventing the moving and stationary contacts from bouncing open.
  • the anti-short-circuit structure when the anti-short-circuit structure is combined with a plurality of movable contact pieces, the anti-short-circuit capability of the anti-short-circuit structure needs to be further improved.
  • An embodiment of the present application provides a relay capable of improving short-circuit resistance.
  • a movable contact assembly wherein both ends of the movable contact assembly in the longitudinal direction are used to contact with a pair of the static contacts respectively;
  • the movable contact assembly includes a plurality of movable branches;
  • An anti-short circuit structure includes a first magnetic conductor and a connecting portion, the first magnetic conductor is arranged on the side of the movable contact assembly facing the static contact, the first magnetic conductor has a plurality of magnetic conductors arranged at intervals, and the connecting portion is connected to two adjacent magnetic conductors; in the movement direction of the movable contact assembly, the plurality of movable branches and the plurality of magnetic conductors have corresponding movable branches and magnetic conductors, and on a target plane, the corresponding magnetic conductors and the movable branches have overlapping areas in their respective orthographic projections, and the target plane is perpendicular to the movement direction of the movable contact assembly.
  • the plurality of movable branches are arranged along a third direction, and the plurality of magnetic conductive portions are arranged along the third direction;
  • the arrangement direction of the pair of static contacts is a first direction
  • the movement direction of the movable contact assembly is a second direction
  • the first direction, the second direction and the third direction are perpendicular to each other.
  • the connecting portion is provided between two adjacent magnetic conductive portions, and the connecting portion and the two adjacent magnetic conductive portions form a through slot; along the second direction, the through slot passes through the first magnetic conductive body;
  • the second direction is the moving direction of the movable contact assembly.
  • two connecting portions are provided between two adjacent magnetic conductive portions in the first magnetic conductive body, and the two connecting portions respectively constitute two slot walls of the through slot that are opposite to each other along the third direction;
  • the arrangement direction of the pair of static contacts is defined as a first direction, and the first direction, the second direction and the third direction are perpendicular to each other.
  • the anti-short circuit structure includes a plurality of first magnetic conductors, which are stacked along the second direction. In the second direction, the positions of the through slots of the plurality of first magnetic conductors correspond.
  • the magnetic conductive portions at both ends of each of the first magnetic conductive bodies have first via holes
  • the relay also includes an insulating cover and a connector, wherein the connector is inserted into a plurality of first through holes corresponding to the second direction, and one end of the connector is connected to the insulating cover, and the other end of the connector is connected to the magnetic conductive portion closest to the movable contact assembly among the plurality of first magnetic conductive bodies.
  • the connecting portion is provided on a side of the first magnetic conductor facing away from the movable contact assembly.
  • the connecting portion covers the gap between the two adjacent magnetic conductive portions.
  • the gap penetrates the first magnetic conductor to separate the first magnetic conductor into a plurality of independently arranged magnetic conductive portions
  • the arrangement direction of the pair of static contacts is defined as a first direction
  • the movement direction of the movable contact assembly is defined as a second direction
  • the first direction, the second direction and the third direction are perpendicular to each other.
  • the anti-short circuit structure includes a plurality of first magnetic conductors, the plurality of first magnetic conductors are stacked along the second direction, and in the second direction, positions of the gaps of the plurality of first magnetic conductors correspond;
  • the first magnetic conductor farthest from the movable contact assembly is provided with the connecting portion on a side facing away from the movable contact assembly.
  • the relay further includes an insulating cover and a connector, and the connecting portion and the first magnetic conductor are connected to the insulating cover via the connector.
  • the magnetic conductive portions at both ends of the first magnetic conductive body have first via holes
  • the connecting portion has second via holes, the first via holes and the second via holes corresponding in position to each other, the first via holes penetrate the magnetic conductive portion along the second direction, and the second via holes penetrate the connecting portion along the second direction;
  • the connecting member is passed through the first through hole and the second through hole, and the connecting member is connected to the magnetic conductive portion.
  • the connecting portion is provided between two adjacent magnetic conductive portions in the first magnetic conductive body, the connecting portion and the two adjacent magnetic conductive portions form a groove, the opening of the groove faces the movable contact assembly, and the connecting portion constitutes the bottom of the groove.
  • the anti-short circuit structure also includes a plurality of second magnetic conductors, which are respectively connected to the side of the plurality of movable branches facing away from the static contacts, and the corresponding second magnetic conductors and the magnetic conductive parts are used to form a magnetic conductive circuit.
  • the target plane there is no overlapping area between the gap between two adjacent magnetic conductive parts and the orthographic projections of the second magnetic conductive bodies.
  • the movable contact assembly includes a movable contact piece, which has a through groove.
  • the through groove penetrates the movable contact piece along the thickness direction of the movable contact piece.
  • the two opposite groove walls of the through groove are respectively the two movable branches.
  • the movable branch is a movable contact piece, and a plurality of the movable contact pieces are independently arranged with each other, and both ends of the length direction of each movable contact piece are used to contact a pair of the static contacts respectively.
  • a contact gap between at least one of the plurality of movable contact pieces and the stationary contact is smaller than contact gaps between the remaining movable contact pieces and the stationary contact.
  • the anti-short circuit structure is used to form a suction force on the plurality of movable contact pieces in a direction of contact closure;
  • the suction force on the movable contact piece with the smaller contact gap is smaller than the suction force on the other movable contact pieces.
  • the magnetic conductive portion is provided on a side of each of the movable contact pieces facing the static contact;
  • the anti-short-circuit structure also includes at least one second magnetic conductor.
  • the multiple moving contact pieces except for the moving contact piece with a smaller contact gap, the other moving contact pieces are fixedly connected to a second magnetic conductor on the side facing away from the static contact; along the movement direction of the movable contact assembly, a magnetic circuit is formed between the corresponding magnetic conductor and the second magnetic conductor.
  • the suction force on the movable contact piece with a smaller contact gap is zero.
  • the other movable contact pieces are all provided with the magnetic conductive portion on a side facing the static contact.
  • the magnetic conductive portion is provided on a side of each of the movable contact pieces facing the static contact;
  • the anti-short circuit structure further includes a plurality of second magnetic conductors, and each of the movable contact pieces is fixedly connected to a second magnetic conductor on a side facing away from the static contact; along the movement direction of the movable contact assembly, a magnetic circuit is formed between the corresponding magnetic conductors and the second magnetic conductors;
  • the thickness of the second magnetic conductor corresponding to the movable contact piece with the smaller contact gap is smaller than the thickness of the second magnetic conductor corresponding to the other movable contact pieces.
  • the connecting portion is made of soft magnetic material.
  • the first magnetic conductor has multiple spaced-apart magnetic conductive portions.
  • the multiple magnetic conductive portions are magnetized, generating an attractive force along the contact pressure direction. Because adjacent magnetic conductive portions are separated, the mutual interference between the short-circuit ring magnetic fields formed by adjacent magnetic conductive portions is reduced, thereby improving short-circuit resistance.
  • the connecting portion connects two adjacent magnetic conductive portions, allowing the anti-short-circuit structure to function as a single unit, improving assemblability and reducing the assembly space requirements of the anti-short-circuit structure.
  • the through slot or groove separates two adjacent magnetic conductive parts, and the connecting part is connected between the two adjacent magnetic conductive parts, which not only effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts, but also relatively reduces the number of components of the anti-short-circuit structure, thereby improving the assemblability of the anti-short-circuit structure and reducing the requirements for assembly space.
  • the multiple magnetic conductive parts of the first magnetic conductive body are split, and the multiple split magnetic conductive parts are connected by a connecting part, which not only effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts, but also improves the assemblability of the anti-short-circuit structure, reduces the requirements for assembly space, and ensures the firmness of the connection between the connector and the insulating cover.
  • the relay of the embodiment of the present application is conducive to achieving extreme disconnection between contacts and can also achieve delayed disconnection of contacts during short circuit, thereby ensuring the reliability of the relay operation and extending the service life of the product.
  • FIG1 is a perspective schematic diagram of a relay according to an embodiment of the present application.
  • FIG2 shows a cross-sectional view along the A-A section line in FIG1.
  • FIG3 shows a cross-sectional view along the B-B section line in FIG1 , in which the coil frame, coil, magnetic tube and U-shaped yoke are omitted.
  • FIG4 is a perspective schematic diagram showing the anti-short-circuit structure of the first embodiment of the present application.
  • FIG5 is a side view schematic diagram showing the anti-short circuit structure according to the first embodiment of the present application.
  • FIG6 is a perspective schematic diagram showing an anti-short-circuit structure according to a second embodiment of the present application.
  • FIG7 shows a cross-sectional view along the C-C cutting line in FIG6.
  • FIG8 is a side view schematic diagram showing an anti-short circuit structure according to a third embodiment of the present application.
  • FIG9 is a perspective schematic diagram showing a movable contact piece according to another embodiment of the present application.
  • FIG10 shows a partial schematic diagram when none of the three moving contact pieces are in contact with the stationary contacts.
  • FIG11 is a partial schematic diagram showing a situation in which the middle movable contact piece among three movable contact pieces is in contact with the stationary contact, while the other two movable contact pieces are not in contact with the stationary contact.
  • FIG12 shows a partial schematic diagram when the three moving contact pieces are in contact with the stationary contacts.
  • FIGS. 13 and 14 are schematic diagrams showing an anti-short circuit structure and a plurality of movable contact pieces according to two different embodiments.
  • the relay includes an insulating cover 21 , a yoke plate 25 , a pair of static contacts 22 , an arc extinguishing portion 26 , a moving assembly 30 and a magnetic circuit portion 40 .
  • the insulating cover 21 has an inner cavity 212.
  • a pair of static contacts 22 are mounted on the top of the insulating cover 21. At least a portion of each static contact 22 extends into the inner cavity 212 of the insulating cover 21.
  • Each static contact 22 also has a static contact point at its bottom. The static contact point can be integrally or separately disposed at the bottom of the static contact 22.
  • One static contact 22 serves as a terminal for current inflow, while the other static contact 22 serves as a terminal for current outflow.
  • the insulating cover 21 may be made of ceramic material, that is, the insulating cover 21 is a ceramic cover, but is not limited thereto.
  • the insulating cover 21 may also be made of plastic material.
  • the insulating cover 21 is made of ceramic material, and the insulating cover 21 is connected to the yoke iron plate 25 through a frame piece 24.
  • the frame piece 24 can be a metal piece with an annular structure, such as an iron-nickel alloy.
  • One end of the frame piece 24 is connected to the opening edge of the insulating cover 21, for example, by laser welding, brazing, resistance welding, gluing, etc.
  • the other end of the frame piece 24 is connected to the yoke iron plate 25, which can also be done by laser welding, brazing, resistance welding, gluing, etc.
  • a frame piece 24 is provided between the insulating cover 21 and the yoke iron plate 25 to facilitate the connection between the insulating cover 21 and the yoke iron plate 25.
  • the movable assembly 30 includes a movable contact assembly 30a, a first elastic member 32, and a push rod member 33.
  • the movable contact assembly 30a may include one or more movable contact pieces 31.
  • each movable contact piece 31 comprises a movable branch 311; in another embodiment, a single movable contact piece 31 may comprise multiple movable branches 311.
  • the arrangement direction of the pair of static contacts 22 is defined as the first direction D1
  • the movement direction of the movable contact piece 31 is defined as the second direction D2, wherein the first direction D1 is perpendicular to the second direction D2.
  • a direction perpendicular to both the first direction D1 and the second direction D2 is defined as the third direction D3.
  • the push rod member 33 is movably provided in the first through hole 251 of the yoke plate 25, and part of the push rod member 33 extends out of the side surface of the yoke plate 25 facing the static contact 22, and part of the push rod member 33 extends out of the side surface of the yoke plate 25 facing away from the static contact 22.
  • a metal cover 27 is further provided on the side of the yoke plate 25 facing away from the static contact 22.
  • the metal cover 27 covers the first through-hole 251 of the yoke plate 25.
  • the portion of the push rod member 33 extending from the side of the yoke plate 25 facing away from the static contact 22 is inserted into the metal cover 27.
  • the static iron core 42 is fixedly disposed in the metal cover 27, and a portion of the static iron core 42 is inserted into the first through-hole 251.
  • the static iron core 42 has a second through-hole 421, and the second through-hole 421 corresponds to the position of the first through-hole 251, so that the push rod member 33 can be movably penetrated in the first through-hole 251 and the second through-hole 421.
  • the moving iron core 41 is movably disposed in the metal cover 27 and is arranged relative to the static iron core 42 in the second direction D2.
  • the moving iron core 41 is connected to the push rod member 33 and is used to be attracted by the static iron core 42 when the coil 44 is energized.
  • the moving iron core 41 and the push rod member 33 can be connected by screwing, riveting, welding or other methods.
  • the magnetic circuit portion 40 further includes a second elastic member 46.
  • the second elastic member 46 is located in the metal cover 27 and is disposed between the static iron core 42 and the movable iron core 41.
  • the second elastic member 46 is used to reset the movable iron core 41 when the coil 44 is de-energized.
  • the second elastic member 46 is a spring and is sleeved on the outer circumference of the push rod member 33 , but the present invention is not limited thereto.
  • the stationary iron core 42 attracts the movable iron core 41 to move upward, and the movable iron core 41 drives the push rod member 33 upward.
  • the movable contact piece 31 contacts the stationary contact 22, the movable contact piece 31 is stopped by the stationary contact 22, while the push rod member 33 continues to move upward until the overtravel is completed.
  • the first elastic member 32 is squeezed by the push rod member 33 and can provide elastic force to the movable contact piece 31 to provide contact pressure.
  • the magnetic circuit portion 40 also includes a U-shaped yoke 47 and a magnetic tube 45.
  • the U-shaped yoke 47 includes a bottom yoke plate 471 and two side yoke plates 472.
  • the two side yoke plates 472 are respectively connected to the two ends of the bottom yoke plate 471 along the first direction D1, and the two side yoke plates 472 are arranged opposite each other along the first direction D1.
  • the bottom yoke plate 471 is located on the side of the coil frame 43 facing away from the static contact 22.
  • the ends of the two side yoke plates 472, facing away from the bottom yoke plate 471, are respectively connected to the two ends of the yoke plate 25 along the first direction D1.
  • the coil 44, coil frame 43, metal cover 27, and movable iron core 41 are accommodated in the space enclosed by the yoke plate 25 and the bottom yoke plate 471 and the two side yoke plates 472 of the U-shaped yoke 47.
  • the magnetic tube 45 is sleeved around the outer periphery of the metal cover 27 and is located between the metal cover 27 and the coil frame 43.
  • the arc-extinguishing portion 26 includes a magnet 262, which is disposed on the outer side of the insulating cover 21.
  • a magnetic field is generated around the stationary contact 22 and the movable contact piece 31. Consequently, the arc generated between the stationary contact 22 and the movable contact piece 31 is stretched away from each other by the magnetic field, thereby extinguishing the arc.
  • the magnet 262 is a permanent magnet.
  • the arc extinguishing portion 26 further includes a yoke clamp 261, and a magnet 262 is disposed between a surface of the yoke clamp 261 facing the insulating cover 21 and the outer peripheral surface of the insulating cover 21.
  • the design of the yoke clamp 261 surrounding the magnet 262 prevents the magnetic field generated by the magnet 262 from spreading outward and affecting the arc extinguishing effect.
  • the yoke clip 261 is made of a soft magnetic material, which may include but is not limited to iron, cobalt, nickel, and alloys thereof.
  • the number of yoke clips 261 can be one or two.
  • the yoke clip 261 forms an annular structure that surrounds the outer circumference of the insulating cover 21.
  • each yoke clip 261 can be U-shaped and arranged opposite each other along the first direction D1, with the two yoke clips 261 respectively surrounding the two ends of the insulating cover 21 along the first direction D1.
  • the relay of the embodiment of the present application also includes an anti-short-circuit structure 50, which is used to generate a suction force on the moving contact piece 31 along the contact pressure direction.
  • the suction force can resist the electric repulsion between the moving contact piece 31 and the static contact 22 due to the short-circuit current, thereby preventing the moving contact piece 31 and the static contact 22 from bouncing apart.
  • the anti-short-circuit structure 50 includes a first magnetic conductor 51 and a connecting portion 53.
  • the first magnetic conductor 51 is disposed on the side of the plurality of movable contact pieces 31 facing the stationary contact 22.
  • the first magnetic conductor 51 has a plurality of spaced magnetic conductors 512, and the connecting portion 53 connects two adjacent magnetic conductors 512.
  • the plurality of movable contact pieces 31 and the plurality of magnetic conductors 512 have corresponding movable contact pieces 31 and magnetic conductors 512, and the orthographic projections of the corresponding magnetic conductors 512 and movable contact pieces 31 on a target plane have an overlapping area.
  • the target plane is perpendicular to the direction of movement of the movable contact piece 31 (the second direction D2).
  • each movable contact piece 31 has a corresponding magnetic conductive portion 512; in another embodiment, in the second direction D2, some of the plurality of movable contact pieces 31 have corresponding magnetic conductive portions 512, while the remaining movable contact pieces 31 do not have corresponding magnetic conductive portions 512.
  • the first magnetic conductor 51 has multiple spaced magnetic conductive portions 512.
  • the multiple magnetic conductive portions 512 are magnetized, generating an attractive force along the contact pressure direction. Since adjacent magnetic conductive portions 512 are separated, the mutual interference between the short-circuit ring magnetic fields formed by adjacent magnetic conductive portions 512 is reduced, thereby improving the short-circuit resistance.
  • the connecting portion 53 is connected to two adjacent magnetic conductive portions 512, allowing the anti-short-circuit structure to function as a single unit, improving assembly ease and reducing the assembly space requirements for the anti-short-circuit structure.
  • the first magnetic conductive body 51 has three magnetic conductive portions 512 .
  • the three magnetic conductive portions 512 correspond to the three movable contact pieces 31 in the second direction D2 , respectively, but the present invention is not limited thereto.
  • multiple movable contact pieces 31 are arranged along the first direction D1, and multiple magnetic conductive portions 512 are arranged along the first direction D1.
  • a gap 511b is formed between two adjacent magnetic conductive portions 512, and the orthographic projections of the gap 511b and the movable contact piece 31 on the target plane do not overlap.
  • the gap 511b extends through the first magnetic conductive body 51 to separate the first magnetic conductive body 51 into a plurality of independently disposed magnetic conductive portions 512.
  • the connecting portion 53 is provided with a plurality of independently disposed magnetic conductive portions 512 on the side facing the movable contact piece 31.
  • the plurality of magnetic conductive portions 512 are spaced apart along the third direction D3.
  • the anti-short-circuit structure 50 includes a plurality of first magnetic conductors 51 stacked along the second direction D2, and the positions of the gaps 511b of the plurality of first magnetic conductors 51 correspond in the second direction D2; among the plurality of first magnetic conductors 51, the first magnetic conductor 51 farthest from the moving contact piece 31 is provided with a connecting portion 53 on the side facing away from the moving contact piece 31.
  • the anti-short circuit structure 50 further includes a plurality of second magnetic conductors 52 , which are respectively connected to the side of the plurality of movable contact pieces 31 facing away from the static contact 22 .
  • the corresponding second magnetic conductors 52 and the magnetic conductive parts 512 are used to form a magnetic conductive circuit.
  • the plurality of magnetic conductive portions 512 in the first magnetic conductive body 51 are arranged at intervals, which reduces the mutual interference between the magnetic fields of different short-circuit rings and ensures the attraction between the corresponding magnetic conductive portions 512 and the second magnetic conductive body 52 .
  • the first magnetic conductor 51 and the connecting portion 53 are fixed relative to the insulating cover 21. This transfers the short-circuit-resistant suction force to the insulating cover 21. Because the insulating cover 21 is a stationary component, there's no need for excessive coil retention force, which reduces the relay's coil power consumption and size, improving its short-circuit resistance.
  • the connecting portion 53 and the first magnetic conductor 51 are connected to the insulating cover 21 via a connector 54.
  • the magnetic conductors 512 at both ends of the first magnetic conductor 51 have first through-holes 5121
  • the connecting portion 53 has second through-holes 531 corresponding to the positions of the first through-holes 5121.
  • the first through-holes 5121 penetrate the first magnetic conductor 51 along the second direction D2
  • the second through-holes 531 penetrate the connecting portion 53 along the second direction D2.
  • the connector 54 is disposed through the first through-holes 5121 and the second through-holes 531 and is connected to the magnetic conductor 512.
  • the connecting member 54 passes through the second through-hole 531 of the connecting portion 53 and the first through-hole 5121 of the magnetic conductor 512 of the first magnetic conductor 51, and the connecting member 54 is connected to the magnetic conductor 512 of the first magnetic conductor 51.
  • the outer peripheral surface of the connecting member 54 may also be provided with a stepped structure, which abuts against the peripheral edge of the second through-hole 531 on the side of the connecting portion 53 facing away from the movable contact piece 31.
  • the connecting member 54 passes through the second through hole 531 of the connecting portion 53 and the first through hole 5121 of the multiple magnetic conductors 512 of the multiple first magnetic conductors 51, and the connecting member 54 is connected to the magnetic conductor 512 of the first magnetic conductor 51 that is closest to the moving contact piece 31 among the multiple first magnetic conductors 51.
  • the multiple magnetic conductive parts 512 of the first magnetic conductive body 51 are split, and the multiple split magnetic conductive parts 512 are connected by a connecting part 53, which effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts 512, and improves the assemblability of the anti-short-circuit structure, reduces the requirements for assembly space, and ensures the firmness of the connection between the connecting part 54 and the insulating cover 21.
  • first magnetic conductor 51 and the connecting portion 53 may also be fixed relative to the insulating cover 21 in the following manner: the first magnetic conductor 51 is fixedly disposed in the insulating cover 21 via a fixing bracket (not shown).
  • the fixing bracket is disposed in the insulating cover 21 and fixedly connected to the yoke plate 25.
  • the first magnetic conductor 51 and the connecting portion 53 are fixedly connected to the fixing bracket.
  • first magnetic conductor 51 and the connecting portion 53 may also be fixedly connected to the push rod member 33 to form a follow-up anti-short-circuit structure.
  • the anti-short circuit structure 50 of the second embodiment of the present application is similar to the anti-short circuit structure 50 of the first embodiment and is not described in detail.
  • the difference between the two embodiments is as follows:
  • a connecting portion 53 is provided between two adjacent magnetic conductive portions 512 of the first magnetic conductive body 51.
  • the connecting portion 53 and the two adjacent magnetic conductive portions 512 together form a through slot 511a.
  • the through slot 511a extends through the first magnetic conductive body 51 along the second direction D2.
  • the connecting portion 53 and the magnetic conductive portions 512 are integrally formed.
  • the through slot 511a does not penetrate both side surfaces of the first magnetic conductor 51 along the first direction D1.
  • the through slot 511a may only penetrate one side surface of the first magnetic conductor 51 along the first direction D1.
  • each first magnetic conductive body 51 has first through holes 5121 , and the first through holes 5121 are used for the connector 54 to pass through.
  • a connecting portion 53 is provided between two adjacent magnetic conductive portions 512 of the first magnetic conductive body 51.
  • the connecting portion 53 and the magnetic conductive portions 512 are integrally formed.
  • the connecting portion 53 and the two adjacent magnetic conductive portions 512 together form a groove 511c that opens toward the movable contact piece 31.
  • the connecting portion 53 forms the bottom of the groove 511c.
  • the orthographic projections of the groove 511 c and the movable branch 311 on the target plane do not overlap.
  • the orthographic projections of the groove 511 c and the second magnetic conductor 52 on the target plane do not overlap.
  • the movable contact assembly 30a includes a movable contact piece 31.
  • the two ends of the movable contact piece 31 in the longitudinal direction (first direction D1) are configured to contact a pair of stationary contacts 22.
  • the movable contact piece 31 has a through slot 312 extending through the movable contact piece 31 along its thickness (second direction D2).
  • the two opposing walls of the through slot 312, located along the width (third direction D3) of the movable contact piece 31, serve as two movable branches 311.
  • Two adjacent second magnetic conductors 52 are disposed within the through slot 312.
  • the contact gap between at least one of the plurality of movable contact pieces 31 and the stationary contact 22 is smaller than the contact gaps between the remaining movable contact pieces 31 and the stationary contact 22 .
  • the contact gaps between two of the movable contact pieces 31 and the static contact 22 may be equal and the smallest, while the contact gaps between the remaining movable contact pieces 31 and the static contact 22 may be greater than the contact gaps of the two movable contact pieces 31.
  • the three movable contact pieces are defined as the first movable contact piece 31a, the second movable contact piece 31b, and the third movable contact piece 31c.
  • the portion of the stationary contact 22 that contacts the first movable contact piece 31a is defined as the first stationary contact portion 2231a
  • the portion of the stationary contact 22 that contacts the second movable contact piece 31b is defined as the second stationary contact portion 2231b
  • the portion of the stationary contact 22 that contacts the third movable contact piece 31c is defined as the third stationary contact portion 2231c.
  • the contact gap of the first movable contact piece 31a is smaller. Therefore, the first movable contact piece 31a contacts the stationary contact 22 before the second movable contact piece 31b and the third movable contact piece 31c. In other words, the first movable contact piece 31a, which has the smaller contact gap, is connected first. At this time, the second movable contact piece 31b and the third movable contact piece 31c have not yet contacted the stationary contact 22 (as shown in Figure 11).
  • the movable iron core 41 continues to move for a distance until it makes contact with the stationary iron core 42. During this stage of continued movement of the movable iron core 41, the first, second, and third movable contact pieces 31a, 31b, and 31c do not move further. At this time, the first, second, and third movable contact pieces 31a, 31b, and 31c are all in the overtravel stage.
  • the overtravel distance of the first movable contact piece 31 a is greater than the overtravel distances of the second movable contact piece 31 b and the third movable contact piece 31 c.
  • the suction force on the movable contact piece 31 having the smaller contact gap is smaller than the suction force on the other movable contact pieces 31 .
  • the suction force on the movable contact piece 31 with a smaller contact gap is smaller than the suction force on the other movable contact pieces 31, which may include the following situations: the suction force on the movable contact piece 31 with a smaller contact gap is zero, and the suction force on the other movable contact pieces 31 is not zero; or, the suction force on each movable contact piece 31 is greater than zero, and the suction force on the movable contact piece 31 with a smaller contact gap is smaller than the suction force on the other movable contact pieces 31.
  • the contact gap between one movable contact piece 31 and the stationary contact 22 is the smallest, while the contact gaps between the remaining movable contact pieces 31 and the stationary contact 22 may be equal or unequal.
  • the suction force on the movable contact piece 31 with the smallest contact gap is the smallest, while the suction forces on the remaining movable contact pieces 31 may be equal or unequal.
  • the first, second, and third movable contact pieces 31a, 31b, and 31c form a parallel circuit, allowing each of the first, second, and third movable contact pieces 31a, 31b, and 31c to carry a current of 1kA.
  • a maximum breaking current e.g. 3kA
  • the second and third movable contact pieces 31b, 31c break before the first movable contact piece 31a. Therefore, immediately after the second and third movable contact pieces 31b, 31c break, the first movable contact piece 31a remains in contact with the stationary contact 22, allowing the entire 3kA current to flow into the first movable contact piece 31a.
  • the suction force exerted by the anti-short-circuit structure 50 on the first movable contact piece 31a is zero or minimal, the first movable contact piece 31a does not need to resist the suction force of the anti-short-circuit structure 50 during the breaking process, or the resisted suction force is minimal, thereby facilitating the overall disconnection of the relay.
  • the first, second, and third movable contact pieces 31a, 31b, and 31c form a parallel circuit, so a current of 10 kA flows through each of the first, second, and third movable contact pieces 31a, 31b, and 31c. Because the suction force exerted by the anti-short-circuit structure 50 on the first movable contact piece 31a is weaker than the suction force exerted on the second and third movable contact pieces 31b, 31c, the first movable contact piece 31a is ejected by the electrodynamic repulsive force between the contacts before the second and third movable contact pieces 31b, 31c.
  • a short-circuit current e.g. 30 kA
  • the current in the first movable contact piece 31a gradually decreases from 10 kA to 0 kA, while the current in the second and third movable contact pieces 31b, 31c, respectively, gradually decreases from 10 kA to 15 kA.
  • the electromotive force between the contact points of the second movable contact piece 31b, the third movable contact piece 31c and the static contact 22 also tends to gradually increase, so that the suction force of the anti-short-circuit structure 50 acting on the second movable contact piece 31b and the third movable contact piece 31c can resist a certain electromotive force, play a role in delaying disconnection, and gain reaction time for the short-circuit disconnection of the entire circuit.
  • the relay of the embodiment of the present application is conducive to achieving extreme disconnection between contacts, and can also achieve delayed disconnection of contacts during short circuit, thereby ensuring the reliability of the relay operation and extending the service life of the product.
  • the following describes how the anti-short-circuit structures of three different embodiments can achieve that the suction force on the moving contact piece with the smaller contact gap is smaller than the suction force on the other moving contact pieces.
  • the thickness of the second magnetic conductive body 52 corresponding to the first movable contact piece 31 a is smaller than the thickness of the second magnetic conductive body 52 corresponding to the second movable contact piece 31 b and the third movable contact piece 31 c.
  • each movable contact piece 31 is provided with a magnetic conductive portion 512 on the side facing the static contact 22.
  • the other movable contact pieces 31 are fixedly connected to a second magnetic conductive body 52 on the side facing away from the static contact 22; along the movement direction of the movable contact assembly (the second direction D2), a magnetic conductive circuit is formed between the corresponding magnetic conductive portion 512 and the second magnetic conductive body 52.
  • the other movable contact pieces 31 are all provided with a magnetic conductive portion 512 on the side facing the static contact 22 .
  • the multiple magnetic conductive parts 512 of the first magnetic conductive body 51 are split, and the multiple split magnetic conductive parts 512 are connected by a connecting part 53, which effectively reduces the mutual interference between the short-circuit ring magnetic fields formed by different magnetic conductive parts 512, and improves the assemblability of the anti-short-circuit structure, reduces the requirements for assembly space, and ensures the firmness of the connection between the connecting part 54 and the insulating cover 21.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)

Abstract

La présente demande divulgue un relais, comprenant une paire de contacts statiques (22), un ensemble contact mobile (30a) et une structure anti-court-circuit (50). Deux extrémités de l'ensemble contact mobile (30a) dans la direction de la longueur sont utilisées pour être en contact avec la paire de contacts statiques (22) respectivement ; l'ensemble contact mobile (30a) comprend une pluralité de parties de ramification mobiles (311) ; la structure anti-court-circuit (50) comprend des premiers magnétiseurs (51) et des parties de connexion (53), les premiers magnétiseurs (51) sont disposés sur le côté de l'ensemble contact mobile (30a) faisant face aux contacts statiques (22), les premiers magnétiseurs (51) sont pourvus d'une pluralité de parties magnétiquement conductrices (512) disposées à intervalle, et les parties de connexion (53) sont connectées à chaque paire de parties magnétiquement conductrices (512) adjacentes ; et dans la direction de déplacement de l'ensemble contact mobile (30a), des parties de ramification mobiles (311) et des parties magnétiquement conductrices (512) correspondantes se trouvent parmi la pluralité de parties de ramification mobiles (311) et la pluralité de parties magnétiquement conductrices (512), et les projections orthographiques des parties magnétiquement conductrices (512) et des parties de ramification mobiles (311) correspondantes sur un plan cible ont une zone de chevauchement, le plan cible étant perpendiculaire à la direction de déplacement de l'ensemble contact mobile (30a).
PCT/CN2025/074618 2024-02-07 2025-01-24 Relais Pending WO2025167724A1 (fr)

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CN202410174409.9A CN120453120A (zh) 2024-02-07 2024-02-07 继电器
CN202410174409.9 2024-02-07

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WO2025167724A1 true WO2025167724A1 (fr) 2025-08-14

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CN120878480B (zh) * 2025-09-29 2026-04-03 森萨塔科技（常州）有限公司 电磁开关、致动器系统、集成式接触器和保险丝

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JP2012199112A (ja) * 2011-03-22 2012-10-18 Panasonic Corp 電磁継電器および接点装置
CN218730704U (zh) * 2022-10-12 2023-03-24 厦门宏发电力电器有限公司 继电器
US20240006139A1 (en) * 2021-01-15 2024-01-04 Xiamen Hongfa Electric Power Controls Co., Ltd. High-voltage direct-current magnetic latching relay with sensitive response
CN221861546U (zh) * 2024-02-07 2024-10-18 厦门宏发电力电器有限公司 继电器
CN221861537U (zh) * 2024-02-07 2024-10-18 厦门宏发电力电器有限公司 继电器

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012199112A (ja) * 2011-03-22 2012-10-18 Panasonic Corp 電磁継電器および接点装置
US20240006139A1 (en) * 2021-01-15 2024-01-04 Xiamen Hongfa Electric Power Controls Co., Ltd. High-voltage direct-current magnetic latching relay with sensitive response
CN218730704U (zh) * 2022-10-12 2023-03-24 厦门宏发电力电器有限公司 继电器
CN221861546U (zh) * 2024-02-07 2024-10-18 厦门宏发电力电器有限公司 继电器
CN221861537U (zh) * 2024-02-07 2024-10-18 厦门宏发电力电器有限公司 继电器

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