Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/02—Bases; Casings; Covers
  • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H1/00—Contacts
  • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
  • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force
• • 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
  • H01H50/38—Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/44—Magnetic coils or windings
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/54—Contact arrangements
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/54—Contact arrangements
  • H01H50/546—Contact arrangements for contactors having bridging contacts
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
  • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
  • H01H9/443—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using permanent magnets

Definitions

• the present disclosure relates to a relay.
• a relay is an electronic control device that consists of a control system (also known as the input circuit) and a controlled system (also known as the output circuit). It is commonly used in automatic control circuits. Essentially, a relay functions as an "automatic switch” that uses a smaller current to control a larger current. As such, it plays roles in automatic regulation, safety protection, and circuit switching within electrical systems.
• High-voltage DC relays are a type of relay.
• related technologies typically employ an anti-short-circuit ring electromagnetic structure.
• follow-up type structure refers that the upper yoke iron is installed on the movable component of the relay
• fixed type structure refers that the upper yoke iron is installed in a fixed position other than the movable component.
• the fixed-type anti-short-circuit structure has strong anti-short-circuit capability, its breaking capacity is weakened due to the negative correlation between anti-short-circuit capability and breaking capacity.
• the follow-up type anti-short-circuit structure is influenced by the holding force of the movable iron core. When the short-circuit current is high, the iron core will break off, which will lead to the disconnection of contacts, and to increase the holding force of the moving iron core, it is necessary to increase the coil, which is contrary to the small size and light weight.
• An embodiment of the present disclosure provides a relay that takes into account both anti-short circuit and limit breaking capability.
• a relay including:
• the relay further including an elastic member connected between the movable contact assembly and the push rod assembly, configured to apply an elastic force to the movable contact assembly toward the first position.
• the magnetic portion and the connecting portion are of an integrated structure, and the magnetic portion extends from the connecting portion toward the movable contact piece.
• the first magnetizer includes two magnetic portions arranged oppositely, the two magnetic portions are respectively connected to two sides of the connecting portion along the length direction of the movable contact piece, forming the first magnetizer in an inverted U-shape.
• a magnetic gap between the magnetic portion and the third magnetizer is greater than a magnetic gap between the second magnetizer and the third magnetizer.
• the second magnetizer and the third magnetizer are in direct contact.
• the push rod assembly further includes a support seat fixed at one end of the push rod along the axial direction of the push rod and at least partially extending into the contact chamber; the second magnetizer is fixed to the support seat, and the elastic member is arranged between the movable contact assembly and the support seat.
• the support seat includes:
• the arc extinguishing unit 1300 is used to extinguish arcs generated between the static contact terminal 20 of the sealing unit 1400 and the movable contact piece 54.
• the arc extinguishing unit 1300 further includes two yoke clips 1320, which are correspondingly positioned with the two arc extinguishing magnets 1310. Moreover, the two yoke clips 1320 surround the sealing unit 1400 and the two arc extinguishing magnets 1310. By designing the yoke clips 1320 to surround the arc extinguishing magnets 1310, the diffusion of the magnetic field generated by the arc extinguishing magnets 1310 can be prevented, ensuring effective arc extinguishing.
• the yoke clips 1320 are made of soft magnetic materials, which may include but are not limited to iron, cobalt, nickel, and their alloys.
• FIG. 1 illustrates a perspective view of the relay according to the first embodiment of the present disclosure.
• FIG. 2 illustrates a schematic view of FIG. 1 with the ceramic cover 11 and the frame member 12 removed.
• FIG. 3 illustrates a top view of FIG. 1 .
• FIG. 4 illustrates a cross-sectional view along line A-A in FIG. 3 .
• FIG. 5 illustrates an exploded view of FIG. 1 .
• the sealing unit 1400 of the embodiment of the present disclosure includes a contact container 10, a pair of static contact terminals 20, a first magnetizer 40, a push rod assembly 50, a movable contact assembly 53, and an elastic member 56.
• the contact container 10 has a contact chamber 101 inside.
• the contact container 10 may include an insulating cover 11a and a yoke plate 13.
• the insulating cover 11a covers one side of the yoke plate 13.
• the insulating cover 11a and the yoke plate 13 together enclose the contact chamber 101.
• the insulating cover 11a includes a ceramic cover 11 and a frame member 12.
• the ceramic cover 11 is connected to the yoke plate 13 through the frame member 12.
• the frame member 12 may be a ring-shaped metal component, such as iron-nickel alloy, with one end connected to the opening edge of the ceramic cover 11, for example, by laser welding, brazing, resistance welding, or adhesive bonding.
• the other end of the frame member 12 is connected to the yoke plate 13, also by methods such as laser welding, brazing, resistance welding, or adhesive bonding.
• the ceramic cover 11 includes a top wall 111 and a side wall 112, with one end of the side wall 112 connected around the perimeter of the top wall 111, and the other end connected to the yoke plate 13 through the frame member 12. In this embodiment, the other end of the side wall 112 is connected to the yoke plate 13 through the frame member 12.
• the contact container 10 also has a pair of first through-holes 102 and a second through-hole 103, both communicating with the contact chamber 101.
• the first through-holes 102 are for the static contact terminals 20 to pass through
• the second through-hole 103 is for a connector 30 to pass through.
• first through-holes 102 and the second through-hole 103 are both provided in the top wall 111 of the ceramic cover 11.
• the second through-hole 103 may be located between the two first through-holes 102, meaning the connector 30 is positioned between the pair of static contact terminals 20.
• the number of second through-holes 103 may be two, for two connectors 30 to pass through, but this is not limiting.
• the pair of static contact terminals 20 are connected to the contact container 10, with at least part of each static contact terminal 20 located inside the contact chamber 101.
• One of the pair of static contact terminals 20 serves as the current input terminal, and the other serves as the current output terminal.
• the pair of static contact terminals 20 pass through the pair of first through-holes 102 in one-to-one correspondence and are connected to the top wall 111 of the ceramic cover 11, for example, by welding.
• the bottom of the static contact terminal 20 serves as the static contact, which may be integrally or separately provided at the bottom of the static contact terminal 20.
• the first magnetizer 40 is arranged inside the contact chamber 101 and is fixed relative to the contact container 10.
• the first magnetizer 40 includes a connecting portion 410 and a magnetic portion 420 connected to the connecting portion 410.
• the first magnetizer 40 is fixed relative to the contact container 10 through the connecting portion 410, and the magnetic portion 420 is used to form a magnetic circuit with the third magnetizer 55.
• the offset between the second magnetizer 60 and the magnetic portion 420 along the axial direction of the push rod 51 can be understood as: along the axial direction of the push rod 51, the orthographic projection of the second magnetizer 60 on the movable contact piece 54 does not overlap with the orthographic projection of the magnetic portion 420 on the movable contact piece 54.
• the correspondence between the second magnetizer 60 and the connecting portion 410 can be understood as: along the axial direction of the push rod 51, the orthographic projection of the second magnetizer 60 on the movable contact piece 54 at least partially overlaps with the orthographic projection of the connecting portion 410 on the movable contact piece 54.
• the movable contact assembly 53 is movably connected to the push rod assembly 50 along the axial direction of the push rod 51, between a first position closer to the static contact terminals 20 and a second position farther from the static contact terminals 20.
• the movable contact assembly 53 includes a movable contact piece 54 and a third magnetizer 55.
• the first magnetizer 40 and the second magnetizer 60 are located at the side of the movable contact piece 54 facing the static contact terminals 20, and along the axial direction of the push rod 51, the third magnetizer 55 is fixedly disposed at the side of the movable contact piece 54 facing away from the first magnetizer 40 and the second magnetizer 60.
• the first magnetizer 40 and the second magnetizer 60 are located at one side of the movable contact piece 54, and the third magnetizer 55 is located at the other side.
• the distance between the third magnetizer 55 and the connecting portion 410 is greater than the distance between the third magnetizer 55 and the magnetic portion 420.
• first position and second position in the movable connection of the movable contact assembly 53 relative to the push rod assembly 50 along the axial direction of the push rod 51 refer to the relative positions of the movable contact assembly 53 and the push rod assembly 50.
• the electromagnet unit 1200 when the electromagnet unit 1200 is energized, it drives the push rod 51, the support seat 52, and the movable contact assembly 53 to move together toward the static contact terminals 20.
• the movable contact assembly 53 contacts the static contact terminals 20
• the movable contact assembly 53 is stopped by the static contact terminals 20, while the push rod 51 and the support seat 52 continue to move upward until the overtravel process is completed.
• the overtravel process relative movement occurs between the movable contact assembly 53 and the push rod assembly 50.
• the movable contact assembly 53 is defined as fixed, the push rod assembly 50 will move upward relative to the movable contact assembly 53. Conversely, if the push rod assembly 50 is defined as fixed, the movable contact assembly 53 will move downward relative to the push rod assembly 50.
• the movable contact assembly 53 when the movable contact assembly 53 is separated from the static contact terminals 20 or just makes contact with them, the movable contact assembly 53 is in the first position relative to the push rod assembly 50, meaning the movable contact assembly 53 is closer to the static contact terminals 20.
• the movable contact assembly 53 moves downward relative to the push rod assembly 50, i.e., away from the static contact terminals 20, until it reaches the second position.
• the overtravel process is completed. At this point, the compression of the elastic member 56 reaches its maximum.
• the third magnetizer 55 and the movable contact piece 54 may be fixed by riveting, but this is not limiting.
• first magnetizer 40, second magnetizer 60, and third magnetizer 55 can all be made of materials such as iron, cobalt, nickel, and their alloys.
• the second magnetizer 60 may be linear shape, while the first magnetizer 40 and third magnetizer 55 may be U-shaped, but this is not limiting.
• first magnetizer 40, second magnetizer 60, and third magnetizer 55 can be designed to include multiple stacked magnetic sheets as needed.
• the two ends of the movable contact piece 54 are used to contact the bottoms of the pair of static contact terminals 20, achieving contact closure.
• the two ends of the movable contact piece 54 along its length direction D2 can serve as movable contacts.
• the movable contacts at the ends of the movable contact piece 54 may protrude from other parts of the movable contact piece 54 or be flush with them.
• movable contacts may be integrally or separately provided at the two ends of the movable contact piece 54 along its length direction D2.
• the elastic member 56 is located between the movable contact assembly 53 and the support seat 52, used to apply an elastic force to the movable contact assembly 53 toward the first position.
• the elastic member 56 may be a spring, but this is not limiting.
• one end of the elastic member 56 abuts against the support seat 52, and the other end abuts against the third magnetizer 55 of the movable contact assembly 53.
• a through-hole may be provided in the third magnetizer 55, and the elastic member 56 may pass through this through-hole to abut against the movable contact piece 54.
• the support seat 52 includes a base 521 and a bracket 522.
• the base 521 is connected to one axial end of the push rod 51, and the bracket 522 is connected to the base 521.
• the second magnetizer 60 is connected to the inner wall surface of the bracket 522, and the movable contact piece 54 and third magnetizer 55 are movably arranged between the base 521 and the bracket 522.
• One end of the elastic member 56 abuts against the base 521, and the other end abuts against the third magnetizer 55.
• the bracket 522 may be inverted U-shaped and snap-fitted with the base 521.
• the base 521 and bracket 522 enclose a chamber for accommodating the movable contact assembly 53 and the elastic member 56.
• the bracket 522 may include a top portion 523 and two side portions 524, with the two side portions 524 connected to the sides of the top portion 523 and extending from the top portion 523 toward the base 521, forming the inverted U-shape.
• the ends of the two side portions 524 away from the top portion 523 are connected to the base 521.
• the space between the two side portions 524 allows the movable contact piece 54 and third magnetizer 55 to pass through and move.
• the sealing unit 1400 further includes a metal cover 1410, which is connected to the side of the yoke plate 13 opposite to the insulating cover 11a and covers the third through-hole 131 on the yoke plate 13.
• the metal cover 1410 and yoke plate 13 enclose a chamber for accommodating the static iron core and movable iron core 1240 of the electromagnet unit 1200, which will be described in detail below.
• the movable iron core 1240 is movably arranged inside the metal cover 1410 and is positioned opposite to the static iron core.
• the movable iron core 1240 is connected to the push rod 51, and when the coil 1220 is energized, the movable iron core 1240 is attracted to the static iron core.
• the movable iron core 1240 and push rod 51 may be connected by screwing, riveting, welding, or other methods.
• FIG. 6 illustrates a cross-sectional view along line B-B in FIG. 3 , with the ceramic cover, frame member, and connector removed, and overtravel is completed.
• FIG. 7 illustrates a cross-sectional view along line C-C in FIG. 3 , with the ceramic cover, frame member, and connector removed, and overtravel is completed.
• FIG. 8 illustrates a cross-sectional view along line A-A in FIG. 3 , with the ceramic cover, frame member, and connector removed, and overtravel is completed.
• FIGS. 6 to 8 show the state after overtravel is completed.
• the movable contact assembly 53 can be considered to be in the second position relative to the push rod assembly 50.
• a first magnetic circuit is formed between the first magnetizer 40 and the third magnetizer 55, generating a magnetic attraction force between them.
• a second magnetic circuit is formed between the second magnetizer 60 and the third magnetizer 55, generating a magnetic attraction force between them. Since the first magnetizer 40 is fixed relative to the contact container 10, a fixed-type anti-short-circuit structure is formed between the first magnetizer 40 and the third magnetizer 55 during a short-circuit current, with the holding force provided by the contact container 10.
• the connecting portion 410 of the first magnetizer 40 and the second magnetizer 60 are aligned, while the magnetic portion 420 of the first magnetizer 40 and the second magnetizer 60 are offset.
• This design ensures that the first magnetizer 40 does not excessively occupy space along the direction perpendicular to the axial direction of the push rod 51, which is beneficial for reducing the volume of the relay.
• FIGS. 9 to 11 show the state when the movable contact piece 54 just contacts or separates from the static contact terminals 20. In this state, the movable contact assembly 53 can be considered to be in the first position relative to the push rod assembly 50.
• the push rod assembly 50 moves downward relative to the static contact terminals 20, meaning the movable contact assembly 53 moves from the second position to the first position relative to the push rod assembly 50, transitioning from FIG. 7 to FIG. 10 .
• the magnetic spacing between the second magnetizer 60 and the third magnetizer 55 gradually decreases.
• the second magnetizer 60 contacts the movable contact assembly 53, and the magnetic gap between the second magnetizer 60 and the third magnetizer 55 becomes smaller than that between the magnetic portion 420 and the third magnetizer 55.
• most of the magnetic flux flows through the magnetic circuit with the smaller magnetic spacing, i.e., most of the magnetic flux flows through the magnetic circuit formed between the second magnetizer 60 and the third magnetizer 55.
• one magnetic flux line is formed between the magnetic portion 420 of the first magnetizer 40 and the third magnetizer 55.
• three magnetic flux lines are formed between the second magnetizer 60 and the third magnetizer 55.
• the magnetic attraction force between the second magnetizer 60 and the third magnetizer 55 is large, while the magnetic attraction force between the magnetic portion 420 and the third magnetizer 55 is small. Since the second magnetizer 60 contacts the movable contact assembly 53, the magnetic attraction force between the second magnetizer 60 and the third magnetizer 55 becomes an internal force and does not affect the breaking of the movable contact piece 54. Therefore, the movable contact piece 54 only needs to overcome the smaller magnetic attraction force between the magnetic portion 420 and the third magnetizer 55 to achieve breaking.
• the second magnetizer 60 and the connecting portion 410 are aligned along the axial direction of the push rod 51 (i.e., their projections on the movable contact piece 54 overlap), most of the magnetic flux flows through the magnetic portion 420 and the second magnetizer 60, with only a small amount flowing through the connecting portion 410.
• the connecting portion 410 and the second magnetizer 60 only slightly weaken the overall magnetic attraction force between the first magnetizer 40 and the third magnetizer 55, which is beneficial for breaking.
• the magnetic flux lines of the connecting portion 410 and the second magnetizer 60 are in the same direction, creating a repulsive force between them, further aiding breaking.
• the first magnetizer 40 is fixed relative to the contact container 10, and a fixed-type anti-short-circuit structure is formed between the magnetic portion 420 and the third magnetizer 55.
• the second magnetizer 60 is fixed to the support seat 52 of the push rod assembly 50, forming a follower-type anti-short-circuit structure with the third magnetizer 55.
• the magnetic portion 420 of the first magnetizer 40 and the second magnetizer 60 are offset along the axial direction of the push rod 51, while the connecting portion 410 of the first magnetizer 40 and the second magnetizer 60 are aligned along the axial direction of the push rod 51.
• the relay of the embodiment of the present disclosure meets the requirements for anti-short circuit and limit breaking capability while ensuring that the first magnetizer 40 does not excessively occupy space along the direction perpendicular to the axial direction of the push rod 51, which is beneficial for reducing the volume of the relay.
• the second magnetizer 60 and the third magnetizer 55 may either be in direct contact or have a gap between them.
• the second magnetizer 60 and the third magnetizer 55 are in direct contact. In this case, most of the magnetic flux flows through the magnetic circuit formed between the second magnetizer 60 and the third magnetizer 55, while a smaller portion flows through the magnetic circuit formed between the magnetic portion 420 and the third magnetizer 55.
• the magnetic attraction force between the magnetic portion 420 and the third magnetizer 55 is relatively small, which is more conducive to the separation of the movable contact piece 54 and the static contact terminals 20.
• the magnetic portion 420 and the connecting portion 410 are of an integrated structure, and the magnetic portion 420 extends from the connecting portion 410 toward the movable contact piece 54.
• the first magnetizer 40 includes two oppositely arranged magnetic portions 420, which are respectively connected to the two opposite sides of the connecting portion 410 along the length direction D2 of the movable contact piece 54, forming an inverted U-shape for the first magnetizer 40.
• the first magnetizer 40 may also be L-shaped, with one side serving as the connecting portion 410 and the other side serving as the magnetic portion 420.
• the relay of the embodiment of the present disclosure further includes a connector 30, which passes through the second through-hole 103 and includes a first end 31 and a second end 32.
• the first end 31 is connected to the contact container 10, and the second end 32 is connected to the first magnetizer 40.
• the connecting portion 410 of the first magnetizer 40 is connected to the contact container 10 through the connector 30 rather than directly, making the connection process unobstructed and visible, which is both convenient and ensures reliability.
• top wall 111 and side wall 112 can also be connected by adhesive bonding.
• the top wall 111 is plate-shaped, it is easier to process the first through-hole 102, second through-hole 103, first metallization layer 113, and second metallization layer 114 on the top wall 111. Furthermore, the plate-shaped structure also makes it easier to weld the connector 30 and the top wall 111, as well as the static contact terminals 20 and the top wall 111.

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=90579888

Family Applications (1)

Country Status (5)

Families Citing this family (2)

Family Cites Families (6)

• 2022
  • 2022-10-12 CN CN202211248733.8A patent/CN117877930A/zh active Pending
• 2023
  • 2023-10-11 JP JP2025521230A patent/JP2025533270A/ja active Pending
  • 2023-10-11 WO PCT/CN2023/124058 patent/WO2024078542A1/fr not_active Ceased
  • 2023-10-11 KR KR1020257015485A patent/KR20250087653A/ko active Pending
  • 2023-10-11 EP EP23876743.8A patent/EP4604164A4/fr active Pending

Also Published As

Similar Documents

Legal Events