CN114203486A - Relay and socket with overcurrent protection function - Google Patents

Relay and socket with overcurrent protection function Download PDF

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Publication number
CN114203486A
CN114203486A CN202111208895.4A CN202111208895A CN114203486A CN 114203486 A CN114203486 A CN 114203486A CN 202111208895 A CN202111208895 A CN 202111208895A CN 114203486 A CN114203486 A CN 114203486A
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CN
China
Prior art keywords
armature
plate spring
relay
plate
iron core
Prior art date
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Pending
Application number
CN202111208895.4A
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Chinese (zh)
Inventor
戴站华
邢晓浩
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Shenzhen Kuke Intelligent Technology Co ltd
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Shenzhen Kuke Intelligent Technology Co ltd
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Application filed by Shenzhen Kuke Intelligent Technology Co ltd filed Critical Shenzhen Kuke Intelligent Technology Co ltd
Priority to CN202310439348.XA priority Critical patent/CN116313649A/en
Priority to CN202111208895.4A priority patent/CN114203486A/en
Publication of CN114203486A publication Critical patent/CN114203486A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • 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
    • H01H50/44—Magnetic coils or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/06—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts
    • H01H61/063—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts making use of a bimetallic element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66—Structural association with built-in electrical component
    • H01R13/70—Structural association with built-in electrical component with built-in switch
    • H01R13/713—Structural association with built-in electrical component with built-in switch the switch being a safety switch
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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

Abstract

The invention discloses a relay with an overcurrent protection function, which is characterized in that a second contact piece on a second plate spring of an electromagnetic relay is improved on the basis of the existing electromagnetic relay, namely, a stator piece and a rotor piece are arranged on the second plate spring; the moving plate is set as a memory metal plate; like this, when the electric current of access exceeded the setting value in the coil, the movable plate rotated to the direction of keeping away from first leaf spring because of the thermomechanical effect, drove the stator and rotated to the direction of keeping away from first leaf spring to make the second contact of the second end of stator and the first contact separation on the first leaf spring, the relay disconnection realizes overcurrent protection function. The invention solves the problems of high circuit cost, low circuit reliability and the like caused by the fact that the overcurrent protection function is realized by additionally adding a circuit design in the prior art. The invention also discloses a socket.

Description

Relay and socket with overcurrent protection function
Technical Field
The invention relates to a relay, in particular to a relay with an overcurrent protection function and a socket.
Background
The relay is generally used for realizing on-off control of a circuit, for example, an electromagnetic relay which is popular at present generally comprises an iron core, a coil, an armature, a first plate spring, a second plate spring and the like, and is electrically connected with an external power supply through the coil, wherein the first plate spring and the second plate spring are respectively connected with two input ends of equipment. When the coil is electrified, the iron core forms electromagnetic attraction force on the armature through the iron core so that the iron core is contacted with the armature, and the armature drives the support rod at the end part to push the first plate spring away so that the first plate spring is contacted with or separated from a contact on the second plate spring; and when the coil is cut off, the electromagnetic attraction of the iron core to the armature disappears, and at the moment, the armature makes the contact of the first plate spring and the second plate spring separate or contact under the action of the reset of the first plate spring. That is, according to the working principle of the relay, the control of the power-on switch of the equipment can be realized.
However, when the current applied to the coil is too large, the relay and the various electrical components in the device are easily damaged. However, the current relays, such as electromagnetic relays, can only realize the on-off control of the circuit, and cannot realize the overcurrent protection of the circuit. The current is generally to insert extra overcurrent protection circuit in the circuit to realize the overcurrent protection of the equipment and the circuit, and the design not only increases the cost of the circuit, but also has low safety and reliability.
Disclosure of Invention
In order to overcome the defects of the prior art, an object of the present invention is to provide a relay with an overcurrent protection function, which can solve the problems of large circuit design cost, low circuit reliability, etc. caused by the overcurrent protection of the circuit in the prior art that the relay needs to additionally add a circuit for overcurrent protection.
The second objective of the present invention is to provide a socket, which can realize the function of overcurrent protection.
One of the purposes of the invention is realized by adopting the following technical scheme:
a relay with an overcurrent protection function comprises a base, an electromagnet, an armature bracket, a first plate spring and a second plate spring, wherein the electromagnet, the armature bracket, the first plate spring and the second plate spring are arranged on the base; the electromagnet comprises a coil and an iron core, wherein the bottom end of the iron core is arranged on the base, and the coil is wound on the outer periphery of the iron core;
the armature is arranged on the armature bracket, the middle part of the armature is provided with a rotating shaft, the rotating shaft is movably connected with the top end of the armature bracket, and the armature is driven to rotate around the central axis of the armature bracket through the rotating shaft; the first end of the armature is positioned above the top end of the iron core, and the second end of the armature is fixedly connected with the first plate spring through a connecting rod; the first plate spring and the second plate spring are symmetrically arranged on the base, a first contact piece is arranged on the first plate spring, and a second contact piece is arranged on the second plate spring; when the first end of the armature iron is contacted with the top end of the iron core, the first contact piece is contacted with the second contact piece and is electrically connected, and the relay is conducted; when the first end of the armature is separated from the top end of the iron core, the first contact piece is separated from the second contact piece, and the relay is disconnected;
the second plate spring is provided with a fixed plate and a movable plate, the first end of the fixed plate is arranged on the second plate spring, and the second end of the fixed plate is movably connected with the first end of the movable plate; the second end of the moving piece is movably connected to the second plate spring, and the second end of the moving piece rotates around the central axis of the second plate spring; the second contact piece is arranged at the second end of the stator piece; the moving plate is a memory metal plate; under the condition that the relay switches on, when the electric current that the coil inserts exceeded the setting value and the temperature of relay exceeded the default, the moving plate rotated to the direction of keeping away from first leaf spring because of the thermomechanical effect, and then drove the stator and rotated to the direction of keeping away from first leaf spring to make the second contact on the stator and the first contact separation on the first leaf spring, the relay disconnection.
Further, when the coil is electrified, the iron core forms electromagnetic attraction force on the first end of the armature, so that the first end of the armature rotates towards the direction close to the iron core and is in contact with the iron core, the armature rotates around the central axis of the armature bracket under the action of the first end of the armature, the second end of the armature is driven to rotate synchronously, and then the connecting rod on the second end of the armature drives the first plate spring to rotate towards the direction close to the second plate spring, so that the first contact piece on the first plate spring is in contact with the second contact piece on the second plate spring, and the relay is switched on;
when the coil is powered off, the electromagnetic attraction of the iron core to the first end of the armature disappears so that the first end of the armature rotates towards the direction far away from the iron core and is separated from the iron core, the armature rotates around the central axis of the armature bracket under the action of the first end of the armature, the second end of the armature is driven to rotate synchronously, then the connecting rod on the second end of the armature drives the first plate spring to rotate towards the direction far away from the second plate spring so that the first contact piece on the first plate spring is separated from the second contact piece on the second plate spring, and the relay is disconnected.
Further, the stator plate is a memory metal plate.
Further, the moving plate is in a curved arc shape, and the arc direction of the moving plate faces the second plate spring.
Furthermore, a yoke is arranged between the bottom end of the iron core and the base, and the bottom end of the iron core is in contact with the yoke.
Furthermore, the armature comprises an armature cross rod and an armature diagonal rod which are fixedly connected, and the joint of the armature cross rod and the armature diagonal rod is arranged at the top end of the armature support; an included angle between the armature transverse rod and one side of the armature inclined rod, which faces the armature bracket, is an obtuse angle; the free end of the armature crossbar is positioned above the iron core, and the fixed end of the armature crossbar is fixedly connected with the fixed end of the armature diagonal rod; the free end of the armature diagonal rod is provided with the connecting rod; when the armature rotates around the central axis of the armature bracket, the free end of the armature cross rod and the free end of the armature diagonal rod synchronously rotate;
when the coil is powered off, the electromagnetic attraction of the iron core to the free end of the armature cross rod disappears, the free end of the armature cross rod rotates towards the direction far away from the iron core and is separated from the iron core, the free end of the armature diagonal rod is driven to rotate synchronously, then the connecting rod of the free end of the armature diagonal rod drives the first plate spring to rotate towards the direction far away from the second plate spring, and the first contact piece is separated from the second contact piece;
when the coil is electrified, the iron core forms electromagnetic attraction to the free end of the armature cross rod, the free end of the armature cross rod rotates towards the direction close to the iron core and is in contact with the iron core, the free end of the armature diagonal rod is driven to rotate synchronously, then the connecting rod of the free end of the armature diagonal rod drives the first plate spring to rotate towards the direction close to the second plate spring, and the first contact plate is in contact with the second contact plate.
Furthermore, the coil is provided with a coil leg, and the coil is electrically connected with an external power circuit through the coil leg.
Further, the first plate spring and the second plate spring are both provided with plate spring weld legs; the first plate spring is electrically connected with a first end of the external equipment through the corresponding plate spring weld leg, and the second plate spring is electrically connected with a second end of the external equipment through the corresponding plate spring weld leg; when the first contact piece on the first plate spring is contacted with the second contact piece on the second plate spring, the first end and the second end of the external equipment form a passage, and the external equipment is connected with a power supply; when the first contact piece on the first plate spring is separated from the second contact piece on the second plate spring, the first end and the second end of the external equipment are disconnected, and the external equipment is powered off.
Furthermore, the relay further comprises a reset switch, wherein the reset switch is arranged on the shell of the relay; the reset switch is used for restoring the moving plate to the initial position.
The second purpose of the invention is realized by adopting the following technical scheme:
a socket comprising a relay with overcurrent protection function as employed for one of the objects of the present invention.
Compared with the prior art, the invention has the beneficial effects that:
the invention improves the existing electromagnetic relay, namely improves the contact of the electromagnetic relay, so that the memory metal sheet is adopted, when the current connected to the coil is overlarge, the temperature of the relay exceeds the preset temperature, and the memory metal sheet is restored to the deformed state due to the thermomechanical effect, so that the two contact sheets of the relay are separated, the relay is disconnected, and the overcurrent protection function is achieved. The invention does not need to add any new circuit design to the circuit of the existing relay or equipment, can ensure the control of the electrified switch of the original electromagnetic relay, can also add the function of overcurrent protection to the circuit, and has simple structure and convenient operation.
Drawings
Fig. 1 is a schematic structural diagram of the inside of a relay with an overcurrent protection function in a closed state according to the present invention;
fig. 2 is a schematic structural diagram of the inside of a relay with an overcurrent protection function in an off state according to the present invention;
fig. 3 is a schematic structural diagram of the inside of a relay with an overcurrent protection function in an overcurrent protection state according to the present invention.
In the figure: 1. a base; 21. a coil; 22. an iron core; 23. a yoke; 24. a coil leg; 31. an armature; 32. an armature support; 33. a connecting rod; 41. a first contact piece; 51. a second contact piece; 52. fixing the sheet; 53. a moving plate; 61. a first plate spring; 62. a second plate spring; 63. and a leaf spring weld leg.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
The invention improves the contact piece on the basis of the structure of the traditional electromagnetic relay, so that the traditional electromagnetic relay not only keeps the switch on-off function of the traditional electromagnetic relay, but also can realize the overcurrent protection function, and solves the problems of high cost, low reliability and the like caused by the fact that the overcurrent protection function of a circuit can be realized only by additionally increasing the current design in the prior art.
The present invention provides a preferred embodiment, a relay with overcurrent protection function, which is an electromagnetic relay, as shown in fig. 1-3, the electromagnetic relay includes a base 1, and an electromagnet, an armature bracket 32, a first plate spring 61 and a second plate spring 62 which are arranged on the base 1.
The electromagnet includes a coil 21 and an iron core 22, and the coil 21 is wound around the outer periphery of the iron core 22. The bottom end of the iron core 22 is fixed on the base 1. The coil 21 is electrically connected to an external power supply circuit. The coil 21 is supplied with current via an external power supply circuit, so that the relay is supplied with power.
More preferably, the base 1 is further provided with a yoke 23, the yoke 23 is fixedly arranged on the base 1, the bottom end of the iron core 22 is in contact with the yoke 23 and is fixed above the yoke 23, and a certain gap is formed between the coil 21 and the yoke 23. When the coil 21 is connected with current, an electromagnetic circuit is formed among the coil 21, the iron core 22 and the yoke 23.
The middle part of the armature 31 is provided with a rotating shaft which is movably connected with the top end of the armature bracket 32, and the armature 31 is driven to rotate around the central axis of the armature bracket 32 through the rotating shaft.
The first end of the armature 31 is located above the top end of the iron core 22, and the second end is provided with a connecting rod 33 and fixedly connected with the first plate spring 61 through the connecting rod 33. When the armature 31 rotates along the central axis of the armature bracket 32, the first end and the second end of the armature 31 are driven to rotate synchronously, and the second end of the armature 31 drives the first plate spring 61 to deform and reset through the connecting rod 33.
Preferably, the first plate spring 61 and the second plate spring 62 are symmetrically arranged on the base 1, and the first contact piece 41 is arranged on the first plate spring 61, and the second contact piece 51 is arranged on the second plate spring 62. The first plate spring 61 is electrically connected to a first end of the external device, and the second plate spring 62 is electrically connected to a second end of the external device.
When the first contact piece 41 contacts the second contact piece 51, the first end and the second end of the external device are communicated; on the contrary, when the first contact piece 41 is separated from the second contact piece 51, the first end and the second end of the external device are disconnected. That is, in the present embodiment, the contact and separation of the first contact piece 41 and the second contact piece 51 are controlled, thereby controlling the on/off of the external device.
More specifically, when the coil 21 is energized, the iron core 22, the coil 21 and the yoke 23 form an electromagnetic circuit, the iron core 22 forms an electromagnetic attraction force on the first end of the armature 31 so that the first end of the armature 31 rotates in a direction close to the iron core 22 and contacts with the iron core 22, at this time, the armature 31 rotates around the central axis of the armature bracket 32 under the rotation action of the first end of the armature 31, the second end of the armature 31 is driven to rotate synchronously, and then the connecting rod 33 on the second end of the armature 31 drives the first plate spring 61 to rotate towards the second plate spring 62, so that the first contact piece 41 on the first plate spring 61 contacts with the second contact piece 51 on the second plate spring 62, and the relay is closed. Since the coil 21 is connected with current, the first contact piece 41 is in contact with and electrically connected to the second contact piece 51, the relay is closed, and the external device is powered on, as shown in fig. 1, the structure of the relay in the closed state of the relay is schematically illustrated, and the first plate spring 61 is reset to be close to the second plate spring 62, so that the first contact piece 41 is in contact with and electrically connected to the second contact piece 51.
Conversely, when the coil 21 is de-energized, the electromagnetic attraction of the iron core 22 to the first end of the armature 31 disappears, the first end of the armature 31 rotates in a direction away from the iron core 22 and is separated from the iron core 22, at this time, the armature 31 rotates around the central axis of the armature bracket 32 under the action of the first end of the armature 31, drives the second end of the armature 31 to rotate synchronously, and further drives the first plate spring 61 to rotate in a direction away from the second plate spring 62 through the connecting rod 33 on the second end of the armature 31, so that the first contact piece 41 on the first plate spring 61 is separated from the second contact piece 51 on the second plate spring 62, and the relay is opened. Since the coil 21 does not receive a current, the first contact piece 41 is separated from the second contact piece 51 and does not contact, the relay is turned off, and the external device is powered off, as shown in fig. 2, the structure of the relay in the relay-off state is schematically illustrated, and the first plate spring 61 is deformed leftward to be away from the second plate spring 62, so that the first contact piece 41 is separated from the second contact piece 51 and does not contact.
That is, when the relay is energized, the first plate spring 61 is brought close to the second plate spring 62 by the action of the coil 21, the iron core 22, and the armature 31 so that the first contact piece 41 is in contact with and electrically connected to the second contact piece 51, and at this time, the first end and the second end of the external device connected to the first plate spring 61 and the second plate spring 62 are connected to each other, and the external device is connected to the power supply. In contrast, when the relay is not energized, the first plate spring 61 is moved away from the second plate spring 62 by the action of the coil 21, the iron core 22, and the armature 31 to separate the first contact piece 41 from the second contact piece 51, and the first end and the second end of the external device connected to the first plate spring 61 and the second plate spring 62 are disconnected, and the external device is disconnected from the power supply.
More preferably, the second plate spring 62 is further provided with a stator 52 and a rotor 53. The first end of the stator 52 is disposed on the second plate spring 62, the second end is movably connected to the first end of the rotor 53, the second end of the rotor 53 is movably connected to the second plate spring 62, and the second end of the rotor 53 rotates along the first direction. The first direction is a circumferential direction around a joint between the moving plate 53 and the second plate spring 62. The second contact piece 51 is provided at a second end of the stator piece 52.
Preferably, the moving plate 53 in this embodiment is a memory metal plate. When the current applied to the coil 21 exceeds a predetermined value, the moving plate 53 rotates in a direction away from the first plate spring 61 due to the thermomechanical effect, for example, in the embodiment, the first end of the moving plate 53 rotates in the first direction to drive the stator 52 to rotate in a direction away from the first plate spring 61, so that the first contact piece 41 on the first plate spring 61 is separated from the second contact piece 51 on the stator 52, and the external device is powered off. That is, the invention utilizes the thermomechanical effect of the memory metal sheet to realize that when the current connected to the coil 21 is too large, the moving sheet 53 is restored to the initial state, and further the stator sheet 52 is driven to rotate in the direction away from the first plate spring 61, so that the first contact sheet 41 on the first plate spring 61 is separated from the second contact sheet 51 on the second end of the stator sheet 52, and the external device is powered off, thereby achieving the purpose of overcurrent protection. As shown in fig. 3, when the current is excessive in the state that the coil 21 is connected with the current, the stator 52 is driven by the moving plate 53 to move in the direction away from the first plate spring 61, so that the second contact piece 41 is separated from the first contact piece 51, the relay is turned off, and the purpose of overcurrent protection is achieved.
When equipment is in a lightning strike or an electrical component is in a short circuit, the current connected to the coil 21 is easily overlarge, and in order to realize an overcurrent protection function, the fixed plate 52 and the movable plate 53 are arranged on the second plate spring 62, the second contact piece 51 is arranged on the fixed plate 52, and the fixed plate 52 is driven to be far away from the first plate spring 61 through the movable plate 53 by utilizing the characteristic that the movable plate 53 is a memory metal piece in the aspect of thermomechanical effect, so that the first contact piece 41 is separated from the second contact piece 51, the relay is disconnected, and the aim of overcurrent protection is fulfilled. The invention has simple structure and convenient operation, does not need to add any additional circuit design, can ensure the on-off control function of the original relay and can realize the overcurrent protection function; meanwhile, the design of a protection circuit in the electrical equipment is reduced, so that the cost of the electrical equipment can be reduced.
More preferably, the movable plate 53 has a curved arc shape. Wherein the arc direction of the moving plate 53 faces the second plate spring 62. By forming the movable piece 53 in a curved arc shape, an excessive rotation arc of the fixed piece 52 can be avoided. The rotation position of the stator 52 can be limited by the rotor 53.
More preferably, the stator 52 is a memory metal sheet. That is, in the present embodiment, both the stator plate 52 and the rotor plate 53 are made of memory metal plates. By presetting the initial states of the stator 52 and the rotor 53, the second contact piece 51 of the stator 52 is not in contact with the first contact piece 41 of the first plate spring 61, so that when the current is introduced into the coil 21 to be overlarge, the memory metal piece is restored to the initial state due to overlarge temperature, and the function of overcurrent protection is realized.
More preferably, the armature 31 includes an armature crossbar and an armature diagonal bar which are fixedly connected, and the included angle between the armature crossbar and the armature diagonal bar towards one side of the armature bracket 32 is an obtuse angle, and the connection position of the armature crossbar and the armature diagonal bar is connected with the top end of the armature bracket 32. Specifically, the free end of the armature crossbar is positioned above the core 22, and the fixed end is fixedly connected with the fixed end of the armature diagonal. The free end of the armature diagonal is provided with a connecting rod 33. The armature 31 rotates about the central axis of the armature support 32 and the first and second ends of the armature 31 rotate in synchronism, i.e. the free end of the armature crossbar rotates in synchronism with the free end of the armature tilt. The free end of the armature cross rod is controlled to be in contact with and not in contact with the iron core 22 by the current access and non-current access of the coil 21, so that the free end of the armature diagonal rod is driven to synchronously rotate, the second plate spring 62 is driven to reset and deform by the connecting rod 33, and the first contact piece 41 is in contact with and separated from the second contact piece 51.
Specifically, when the coil 21 is de-energized, the free end of the armature crossbar rotates toward the direction away from the iron core 22 and separates from the iron core 22, and the free end of the armature crossbar is driven to rotate synchronously, so that the connecting rod 33 disposed at the free end of the armature crossbar drives the first plate spring 61 to rotate toward the direction away from the second plate spring 62, and at this time, the first contact piece 41 separates from the second contact piece 51.
When the coil 21 is energized, the free end of the armature crossbar rotates towards the direction of the iron core 22 and contacts with the iron core 22, so as to drive the free end of the armature crossbar to rotate synchronously, so that the connecting rod 33 arranged at the free end of the armature crossbar drives the first plate spring 61 to rotate towards the direction of the second plate spring 62, and at the moment, the first contact piece 41 contacts with the second contact piece 51. Because armature horizontal pole and armature down tube are the same part of fixed connection, consequently, the free end of armature horizontal pole and the free end synchronous rotation of armature down tube, also promptly: when the free end of the armature cross rod is close to the iron core 22, the free end of the armature diagonal rod synchronously rotates to drive the first plate spring 61 to be close to the second plate spring 62 through the connecting rod 33; when the free end of the armature cross rod is far away from the iron core 22, the free end of the armature diagonal rod synchronously rotates to drive the first plate spring 61 to be far away from the second plate spring 62 through the connecting rod 33.
More preferably, the coil 21 is provided with a coil leg 24, and the coil 21 is electrically connected to an external power circuit through the coil leg 24. Similarly, the first plate spring 61 and the second plate spring 62 are also provided with plate spring fillets 63, the first plate spring 61 is electrically connected to a first end of the external device through the plate spring fillets 63, and the second plate spring 62 is electrically connected to a second end of the external device through the corresponding plate spring fillets 63. When the first contact piece 41 is contacted with the second contact piece 51, a first end and a second end of the external equipment form a passage, and the external equipment is powered on; in contrast, when the first contact piece 41 is separated from the second contact piece 51, the first end and the second end of the external device are disconnected, and the external device disconnects the power supply.
In the practical application process, when an electrical element is short-circuited or generates sound and falls into a lightning, a large current is formed by conduction of a metal wire, a bottom wire and the like, the connected current is too large, the temperature in the relay exceeds a set value, and at the moment, when the memory metal sheet exceeds a certain temperature due to the large current bearing, the memory metal sheet is restored to a state before deformation due to a thermomechanical effect, namely, the movable sheet 53 drives the fixed sheet 52 to rotate towards a direction far away from the first plate spring 61, so that the second contact sheet 51 arranged on the fixed sheet 52 is far away from the first contact sheet 41 on the first plate spring 61, namely, the second contact sheet 51 is separated from the first contact sheet 41, the relay is disconnected, and the overcurrent protection of a circuit is realized.
Preferably, the memory metal sheet in this embodiment is a two-way memory metal sheet. That is, when the line temperature of the relay is recovered, the moving plate 53 is reset, and the stator plate 52 is driven to rotate in a direction close to the first plate spring 61, so that the second contact piece 51 provided on the stator plate 52 is in contact with the first contact piece 41 on the first plate spring 61, the relay is turned on, and the reset of the circuit is realized.
Further, in the present embodiment, a reset switch is further provided on the housing of the relay, the reset switch is connected to the moving plate 53, and the reset switch is operated to control the moving plate 53 to reset. That is, after the relay performs overcurrent protection, in order to reset the relay, the reset switch may be manually operated to reset the relay.
Example two
Based on the relay with the overcurrent protection function provided in the first embodiment, the present embodiment also provides another embodiment, and a socket includes the relay with the overcurrent protection function provided in the first embodiment.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (10)

1. A relay with an overcurrent protection function is characterized by comprising a base, an electromagnet, an armature bracket, a first plate spring and a second plate spring, wherein the electromagnet, the armature bracket, the first plate spring and the second plate spring are arranged on the base; the electromagnet comprises a coil and an iron core, wherein the bottom end of the iron core is arranged on the base, and the coil is wound on the outer periphery of the iron core;
the armature is arranged on the armature bracket, the middle part of the armature is provided with a rotating shaft, the rotating shaft is movably connected with the top end of the armature bracket, and the armature is driven to rotate around the central axis of the armature bracket through the rotating shaft; the first end of the armature is positioned above the top end of the iron core, and the second end of the armature is fixedly connected with the first plate spring through a connecting rod; the first plate spring and the second plate spring are symmetrically arranged on the base, a first contact piece is arranged on the first plate spring, and a second contact piece is arranged on the second plate spring; when the first end of the armature iron is contacted with the top end of the iron core, the first contact piece is contacted with the second contact piece and is electrically connected, and the relay is conducted; when the first end of the armature is separated from the top end of the iron core, the first contact piece is separated from the second contact piece, and the relay is disconnected;
the second plate spring is provided with a fixed plate and a movable plate, the first end of the fixed plate is arranged on the second plate spring, and the second end of the fixed plate is movably connected with the first end of the movable plate; the second end of the moving piece is movably connected to the second plate spring, and the second end of the moving piece rotates around the central axis of the second plate spring; the second contact piece is arranged at the second end of the stator piece; the moving plate is a memory metal plate; under the condition that the relay switches on, when the electric current that the coil inserts exceeded the setting value and the temperature of relay exceeded the default, the moving plate rotated to the direction of keeping away from first leaf spring because of the thermomechanical effect, and then drove the stator and rotated to the direction of keeping away from first leaf spring to make the second contact on the stator and the first contact separation on the first leaf spring, the relay disconnection.
2. The relay with the overcurrent protection function as recited in claim 1, wherein when the coil is energized, the core forms an electromagnetic attraction force on the first end of the armature, so that the first end of the armature rotates in a direction close to the core and contacts with the core, the armature rotates around a central axis of the armature holder under the action of the first end of the armature, the second end of the armature is driven to rotate synchronously, and then the connecting rod on the second end of the armature drives the first plate spring to rotate in a direction close to the second plate spring, so that the first contact piece on the first plate spring contacts with the second contact piece on the second plate spring, and the relay is switched on;
when the coil is powered off, the electromagnetic attraction of the iron core to the first end of the armature disappears so that the first end of the armature rotates towards the direction far away from the iron core and is separated from the iron core, the armature rotates around the central axis of the armature bracket under the action of the first end of the armature, the second end of the armature is driven to rotate synchronously, then the connecting rod on the second end of the armature drives the first plate spring to rotate towards the direction far away from the second plate spring so that the first contact piece on the first plate spring is separated from the second contact piece on the second plate spring, and the relay is disconnected.
3. The relay with the overcurrent protection function as recited in claim 1, wherein the stator is a memory metal sheet.
4. The relay with overcurrent protection function as recited in claim 1, wherein the moving plate has a curved arc shape, and an arc direction of the moving plate faces the second plate spring.
5. The relay with the overcurrent protection function as recited in claim 1, wherein a yoke is disposed between the bottom end of the iron core and the base, and the bottom end of the iron core is in contact with the yoke.
6. The relay with the overcurrent protection function as recited in claim 1, wherein the armature comprises an armature cross bar and an armature diagonal bar which are fixedly connected, and the joint of the armature cross bar and the armature diagonal bar is arranged at the top end of the armature support; an included angle between the armature transverse rod and one side of the armature inclined rod, which faces the armature bracket, is an obtuse angle; the free end of the armature crossbar is positioned above the iron core, and the fixed end of the armature crossbar is fixedly connected with the fixed end of the armature diagonal rod; the free end of the armature diagonal rod is provided with the connecting rod; when the armature rotates around the central axis of the armature bracket, the free end of the armature cross rod and the free end of the armature diagonal rod synchronously rotate;
when the coil is powered off, the electromagnetic attraction of the iron core to the free end of the armature cross rod disappears, the free end of the armature cross rod rotates towards the direction far away from the iron core and is separated from the iron core, the free end of the armature diagonal rod is driven to rotate synchronously, then the connecting rod of the free end of the armature diagonal rod drives the first plate spring to rotate towards the direction far away from the second plate spring, and the first contact piece is separated from the second contact piece;
when the coil is electrified, the iron core forms electromagnetic attraction to the free end of the armature cross rod, the free end of the armature cross rod rotates towards the direction close to the iron core and is in contact with the iron core, the free end of the armature diagonal rod is driven to rotate synchronously, then the connecting rod of the free end of the armature diagonal rod drives the first plate spring to rotate towards the direction close to the second plate spring, and the first contact plate is in contact with the second contact plate.
7. The relay with the overcurrent protection function as recited in claim 1, wherein the coil is provided with a coil leg, and the coil is electrically connected to an external power supply circuit through the coil leg.
8. The relay with the overcurrent protection function according to claim 1, wherein the first plate spring and the second plate spring are provided with plate spring weld feet; the first plate spring is electrically connected with a first end of the external equipment through the corresponding plate spring weld leg, and the second plate spring is electrically connected with a second end of the external equipment through the corresponding plate spring weld leg; when the first contact piece on the first plate spring is contacted with the second contact piece on the second plate spring, the first end and the second end of the external equipment form a passage, and the external equipment is connected with a power supply; when the first contact piece on the first plate spring is separated from the second contact piece on the second plate spring, the first end and the second end of the external equipment are disconnected, and the external equipment is powered off.
9. The relay with the overcurrent protection function as recited in claim 1, further comprising a reset switch, wherein the reset switch is disposed on a housing of the relay; the reset switch is used for restoring the moving plate to the initial position.
10. A socket comprising a relay with overcurrent protection function according to any one of claims 1 to 9.
CN202111208895.4A 2021-10-18 2021-10-18 Relay and socket with overcurrent protection function Pending CN114203486A (en)

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CN202310439348.XA CN116313649A (en) 2021-10-18 2021-10-18 Relay and socket with overcurrent protection function
CN202111208895.4A CN114203486A (en) 2021-10-18 2021-10-18 Relay and socket with overcurrent protection function

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117976467A (en) * 2024-03-29 2024-05-03 苏州锦博元电器有限公司 Relay capable of overcurrent protection and protection method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0562942U (en) * 1991-09-25 1993-08-20 松下電工株式会社 Electromagnetic relay
US20110080250A1 (en) * 2009-10-07 2011-04-07 Tsan-Chi Chen Overcurrent protection device having free trip mechanism
JP2015079672A (en) * 2013-10-17 2015-04-23 パナソニックＩｐマネジメント株式会社 Electromagnetic relay
CN206595209U (en) * 2017-03-09 2017-10-27 中山市道恒继电器有限公司 A kind of anti-short-circuit relay
CN111868864A (en) * 2018-03-16 2020-10-30 田中贵金属工业株式会社 DC high-voltage relay and contact material for DC high-voltage relay

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0562942U (en) * 1991-09-25 1993-08-20 松下電工株式会社 Electromagnetic relay
US20110080250A1 (en) * 2009-10-07 2011-04-07 Tsan-Chi Chen Overcurrent protection device having free trip mechanism
JP2015079672A (en) * 2013-10-17 2015-04-23 パナソニックＩｐマネジメント株式会社 Electromagnetic relay
CN206595209U (en) * 2017-03-09 2017-10-27 中山市道恒继电器有限公司 A kind of anti-short-circuit relay
CN111868864A (en) * 2018-03-16 2020-10-30 田中贵金属工业株式会社 DC high-voltage relay and contact material for DC high-voltage relay

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117976467A (en) * 2024-03-29 2024-05-03 苏州锦博元电器有限公司 Relay capable of overcurrent protection and protection method thereof
CN117976467B (en) * 2024-03-29 2024-07-05 苏州锦博元电器有限公司 Relay capable of overcurrent protection and protection method thereof

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