RELAY

A relay includes an insulating cover having a contact chamber and a pair of first through holes in communication with the contact chamber; a pair of static contact leading-out terminals passing through the pair of first through holes, respectively; a fixing member within the contact chamber and fixedly connected with the insulating cover; a moving part within the contact chamber and movably connected to the fixing member; a first magnetizer within the contact chamber and connected with the moving part; and a movable member movably within the contact chamber and including a movable contact piece. The first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is based upon and claims priority to Chinese Patent Application No. 202310385365.X, filed on Apr. 11, 2023, the entire content thereof is incorporated herein by reference.

TECHNICAL FIELD

An embodiment of the present disclosure relates to the technical field of electronic control devices, in particular to a relay.

BACKGROUND

A relay is an electronic control device that has a control system (also called an input circuit) and a controlled system (also called an output circuit), and usually used in an automatic control unit. The relay is actually an automatic switch that may control a larger current with a smaller current, so that it plays a role of automatic adjustment, safety protection and switching circuits in the circuit.

A high-voltage DC relay is a kind of relay. In order to solve the issue of contact bounce caused by electro-dynamic repulsion force of contacts in the high-voltage DC relay due to short circuit current, it is common to employ an anti-short circuit ring electromagnetic structure. Based on a position of the upper magnetizer of the anti-short circuit ring, it could be further classified into a follow-up structure and a stationary structure. Specifically, the follow-up structure refers to that the upper magnetizer is placed on a movable member of the relay, while the stationary structure refers to that the upper magnetizer is arranged in a fixed location other than the movable member. However, although the stationary anti-short circuit structure significantly enhances its ability to withstand the short circuit, it results in that breaking ability is weaken due to the negative correlation between the short circuit ability and the breaking ability. The movable anti-short circuit structure is affected by a holding force of a movable core, and when the short circuit current is high, the magnetic core may be detached, resulting in contact broken. To increase the holding force of the movable core, it requires increasing size of the coil, which is conflict with a compact and lightweight design.

SUMMARY

A relay according to the embodiment of the present disclosure includes:an insulating cover having a contact chamber and a pair of first through holes in communication with the contact chamber;a pair of static contact leading-out terminals passing through the pair of first through holes, respectively;a fixing member arranged within the contact chamber and fixedly connected with the insulating cover;a moving part arranged within the contact chamber and movably connected to the fixing member;a first magnetizer arranged within the contact chamber and connected with the moving part; anda movable member movably arranged within the contact chamber and including a movable contact piece, the movable contact piece configured to come into contacted with or separated from the pair of static contact leading-out terminals; the first magnetizer being arranged at one side of the movable contact piece facing the static contact leading-out terminals;wherein the first magnetizer is movable relative to the movable member through the moving part and is configured to adjust a distance between the first magnetizer and the movable member according to a value of a current flowing through the movable contact piece.

According to some embodiments of the present disclosure, the distance between the first magnetizer and the movable member is a maximum distance between the first magnetizer and the movable member.

According to some embodiments of the present disclosure, the first magnetizer moves between a first position and a second position through the moving part;at the first position, the distance between the first magnetizer and the movable member is a first distance, and at the second position, the distance between the first magnetizer and the movable member is a second distance, and the first distance is greater than the second distance.

According to some embodiments of the present disclosure, at the second position, the second distance between the first magnetizer and the movable member is equal to zero.

According to some embodiments of the present disclosure, the first magnetizer is located at the first position, and the value of the current flowing through the movable contact piece is less than or equal to a threshold current;when the value of the current flowing through the movable contact piece is greater than the threshold current, the first magnetizer moves from the first position to the second position.

According to some embodiments of the present disclosure, the relay further includes:a first elastic part for providing an elastic force to the moving part, so that the first magnetizer has a trend to move away from the movable member.

According to some embodiments of the present disclosure, the fixing member has a first side facing the movable member and a second side opposite to the first side;the first elastic part is arranged at the second side, the first magnetizer and the movable member are both arranged at the first side, and the first magnetizer is arranged between the first elastic part and the movable member;the moving part has one end connected with the first elastic part, and the other end connected with the first magnetizer.

According to some embodiments of the present disclosure, the fixing member has a first perforation which penetrates a surface of the first side and a surface of the second side;the moving part is rod-shaped and movably passes through the first perforation.

According to some embodiments of the present disclosure, the first elastic part has a second perforation aligning with the first perforation;the moving part passes through the first perforation and the second perforation.

According to some embodiments of the present disclosure, the moving part includes a rod body and a pressing cap arranged at an end of the rod body, and the pressing cap presses against a periphery of the second perforation facing away from a side of the first magnetizer.

According to some embodiments of the present disclosure, the first magnetizer is provided with a third perforation aligning with the first perforation and the second perforation, and the rod body passes through the second perforation, the first perforation and the third perforation in sequence;a step structure is arranged at an outer periphery of the rod body, an end of the rod body facing the movable member is fixedly connected with the first magnetizer, and the step structure abuts against a periphery of the third perforation facing a side of the first elastic part.

According to some embodiments of the present disclosure, the first magnetizer moves between a first position and a second position through the moving part; at the first position, a distance between the first magnetizer and the movable member is a first distance, and at the second position, a distance between the first magnetizer and the movable member is a second distance, and the first distance is greater than the second distance;at the first position, the first magnetizer abuts against the surface of the first side, and an end of the moving part presses against the first elastic part, so that the first elastic part has elastic pre-pressure.

According to some embodiments of the present disclosure, both the first magnetizer and the first elastic part are arranged between the pair of the static contact leading-out terminals.

According to some embodiments of the present disclosure, the first elastic part includes a reed or a spring.

According to some embodiments of the present disclosure, a moving direction of the first magnetizer relative to the movable member is a direction in which the movable contact piece is come into contact with or separated from the static contact leading-out terminals.

According to some embodiments of the present disclosure, the moving part is movably arranged at a side of the movable member facing the static contact leading-out terminals, and the moving part is located between the pair of the static contact leading-out terminals.

According to some embodiments of the present disclosure, the moving part is made of a metal material.

According to some embodiments of the present disclosure, the insulating cover includes a ceramic cover and a frame piece, the ceramic cover is connected with the yoke plate through the frame piece, the pair of first through holes are formed on the ceramic cover; the fixing member is fixedly connected with the ceramic cover.

According to some embodiments of the present disclosure, the fixing member includes:a connector with a rod-shaped, one end of the connector in an axial direction is connected with the ceramic cover;a fixing part connected with the other end of the connector in the axial direction.

According to some embodiments of the present disclosure, the ceramic cover is provided with a third through hole, the connector passes through the third through hole, one end of the connector in the axial direction is connected to a periphery of the third through hole of the ceramic cove.

According to some embodiments of the present disclosure, the connector is a solid rod.

According to some embodiments of the present disclosure, the movable member further including:a second magnetizer, the second magnetizer being fixedly connected to one side of the movable contact piece facing away from the first magnetizer, and the second magnetizer is configured to form a magnetic circuit together with the first magnetizer.

DETAILED DESCRIPTION

Now, the exemplary implementations will be described more completely with reference to the accompanying drawings. However, the exemplary implementations can be implemented in various forms and should not be construed as limiting the implementations as set forth herein. Instead, these implementations are provided so that the present disclosure will be thorough and complete, and concept of the exemplary implementation will be fully conveyed to a skilled person in the art. Same reference numbers denote the same or similar structures in the figures, and thus the detailed description thereof will be omitted.

As shown inFIG.1, a relay according to embodiments of the present disclosure includes a shell1100, an electromagnet unit1200, an arc extinguishing unit1300and a sealing unit1400. The scaling unit1400is arranged within the shell1100, and a top of the static contact leading-out terminal of the sealing unit1400is exposed out of an outer surface of the shell1100through an exposed hole1130of the shell1100. Both the electromagnet unit1200and the arc extinguishing unit1300are arranged within the shell1100.

It can be understood that terms “include” and “have” in the embodiments of the present disclosure and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, a method, a system, a product, or a device that includes a series of steps or units is not limited to listed steps or units, but may optionally include unlisted steps or units or optionally include other steps or components inherent to the process, method, product, or device.

As an example, the shell1100includes a first housing1110and a second housing1120, which are engaged with each other to form a chamber for accommodating the electromagnet unit1200, the arc extinguishing unit1300and the scaling unit1400.

The arc extinguishing unit1300is configured to extinguish an arc generated between the static contact leading-out terminals and the movable contact piece of the scaling unit1400.

As an example, the arc extinguishing unit1300includes two arc extinguishing magnets1310. The arc extinguishing magnets1310may be permanent magnets, and each of the arc extinguishing magnets1310may be substantially cuboid. The two arc extinguishing magnets1310are respectively arranged at both sides of the sealing unit1400and are oppositely arranged along a length direction of the movable contact piece.

By arranging two arc extinguishing magnets1310opposite to each other, a magnetic field may be formed around the static contact leading-out terminals and the movable contact piece. Therefore, the arc generated between the static contact leading-out terminals and the movable contact piece may be drawn long in a direction away from each other under the action of the magnetic field so as to realize arc extinction.

The arc extinguishing unit1300further includes two yoke clips1320. The yoke clips1320are arranged corresponding to positions of the two arc extinguishing magnets1310. Furthermore, the two yoke clips1320surround the sealing unit1400and the two arc extinguishing magnets1310. Due to a design of the yoke clips1320surrounding the arc extinguishing magnets1310, the magnetic field generated by the arc extinguishing magnets1310can be prevented from spreading outward, which will affect the arc extinguishing effect. The yoke clip1320is made of soft magnetic materials. The soft magnetic materials may include, but not limited to iron, cobalt, nickel, and alloys, etc.

As shown inFIGS.2to4, the sealing unit1400according to the embodiments of the present disclosure includes a contact container10, a pair of static contact leading-out terminals20, a pushing rod assembly50, a first magnetizer40, a moving part80, a fixing member60and a first elastic part70. The contact container10has a contact chamber101inside thereof. The contact container10may include an insulating cover11aand a yoke plate13. The insulating cover11ais covered on a side surface of the yoke plate13. The insulating cover11aand the yoke plate13together enclose to form the contact chamber101.

It can be understood that the contact container10is a static part for accommodating a contact assembly. The contact container10mainly may be an housing with a chamber. In addition, the contact container10may be formed by connecting a plurality of parts in a predetermined assembling manner.

The insulating cover11aincludes a ceramic cover11and a frame piece12. The ceramic cover11is connected with the yoke plate13through the frame piece12. The frame piece12may be a metal piece in an annular structure, such as iron-nickel alloy. One end of the frame piece12is connected to an opening edge of the ceramic cover11, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece12is connected to the yoke plate13, also by laser welding, brazing, resistance welding, gluing, etc. The frame piece12is arranged between the ceramic cover11and the yoke plate13, which can facilitate the connection between the ceramic cover11and the yoke plate13.

The contact container10further has a pair of first through holes102which are in communication with the contact chamber101. The first through hole102is configured to allow the static contact leading-out terminals20to pass through. In the embodiments of the present disclosure, the first through hole102is formed on the ceramic cover11.

A pair of static contact leading-out terminals20is connected to the ceramic cover11of the contact container10, and at least portion of each of the static contact leading-out terminals20is located within the contact chamber101. One of the pair of static contact leading-out terminals20serves as a terminal into which the current flows and the other one thereof serves as a terminal out of which current flows.

A pair of static contact leading-out terminals20are passed through a pair of first through holes102in one-to-one correspondence, and connected to the ceramic cover11, for example, by welding.

The bottom portions of the static contact leading-out terminals20serve as static contacts, and the static contacts may be integrally or separately arranged at the bottom portions of the static contact leading-out terminals20.

As shown inFIG.4, the pushing rod assembly50is movably connected to the contact container10in an axial direction of the rod. The pushing rod assembly50may include a rod51, a base52, a movable member53and a second elastic part56.

The yoke plate13has a second through hole131. The second through hole131passes through two opposite sides of the yoke plate13along a thickness direction of the yoke plate13and is in communication with the contact chamber101of the contact container10. The rod51movably passes through the second through hole131in an axial direction. A base52is arranged at an end of the rod51in the axial direction, and at least portion of the base52is located within the contact chamber101.

The movable member53is movably connected to the base52in an axial direction of the rod51. The movable member53includes movable contact piece54. Both ends of the movable contact piece54are contacted with the bottom portions of the pair of static contact leading-out terminals20to close the contacts. The movable contact piece54includes a contact piece and movable contacts arranged at both ends of the contact piece in a length direction. The movable contacts may protrude from the contact piece or be flush with the contact piece.

It can be understood that the movable contacts may be integrally or separately arranged at both ends of the contact piece.

The second elastic part56is connected to the movable member53and the base52, for applying an elastic force to move the movable member53toward the static contact leading-out terminals20.

The pushing rod assembly50further includes a sliding structure57. The sliding structure57is connected to the base52and the movable member53. The movable member53is slidably relative to the base52through the sliding structure57. The sliding structure57includes a limiting hole572and a limiting part571in cooperation with each other. The limiting part571may slidably extend into the limiting hole572.

In the embodiments of the present disclosure, the base52is directly connected with the movable member53through the sliding structure57, so that the assembling between the base52and the movable member53is simpler. Moreover, since there are no other parts between the movable member53and the first magnetizer40, it is avoided that the other parts interfere with the first magnetizer40during an over-travel.

It can be understood that the limiting hole572may be a through hole or a blind hole.

As an example, the base52is provided with a limiting hole572, and the movable member53is provided with a limiting part571.

Of course, in other embodiments, the pushing rod assembly50may also have other structures, which are not listed herein.

As shown inFIGS.4to6, the sealing unit1400further includes a metal cover1410. The metal cover1410is connected to a side of the yoke plate13facing away from the insulating cover11a. The metal cover1410covers the second through hole131on the yoke plate13. The metal cover1410and the yoke plate13enclose to form a chamber for accommodating the static core1230and the movable core1240of the electromagnet unit1200.

The electromagnet unit1200includes a bobbin1210, a coil1220, a static core1230, a movable core1240, and a reset part1250. The bobbin1210has a hollow tubular shape and is formed of an insulating material. The metal cover1410is inserted into the bobbin1210. The coil1220surrounds the bobbin1210. The static core1230is fixedly arranged in the metal cover1410, and a part of the static core1230extends into the second through hole131. The static core1230has a through hole1231. The through hole1231is aligning with the second through hole131, for the rod51to pass through. The movable core1240is movably arranged within the metal cover1410and is arranged opposite to the static core1230. The movable core1240is connected with the rod51, to be attracted by the static core1230when the coil1220is powered on. The movable core1240and the rod51may be connected by screwing, riveting, welding or other means.

The reset part1250is located within the metal cover1410and is arranged between the static core1230and the movable core1240, and is configured to reset the movable core1240when the coil1220is powered off. The reset part1250may be a spring and is sleeved outside the rod51.

It should be noted that when the coil1220is powered on, the electromagnet unit1200may drive the pushing rod assembly50upward through the rod51. When the movable member53is in contact with the static contact leading-out terminals20, the movable member53is stopped by the static contact leading-out terminals20, and the rod51and the base52may continue to move upward until the over-travel is completed.

Referring toFIGS.4to6, the first magnetizer40is arranged within the contact chamber101, and the first magnetizer40is arranged at a side of the movable contact piece54facing the static contact leading-out terminals20. The fixing member60is fixedly connected to the insulating cover of the contact container10. The moving part80is movably mounted to the fixing member60. The first magnetizer40is arranged within the contact chamber101and connected with the moving part80, and the first magnetizer40is movable relative to the movable member53through the moving part80.

The movable member53further includes a second magnetizer55arranged within the contact chamber101. The second magnetizer55is fixedly connected with the movable contact piece54. The second magnetizer55is located at a side of the movable contact piece54facing away from the first magnetizer40. The second magnetizer55is configured to form a magnetic circuit with the first magnetizer40. In the embodiments of the present disclosure, the limiting part571may be arranged at the second magnetizer55, but it is not limited thereto.

As an example, the second magnetizer55and the movable contact piece54may be fixedly connected by rivets, but it is not limited thereto.

It can be understood that both the first magnetizer40and the second magnetizer55may be made of materials such as iron, cobalt, nickel and alloys thereof.

In an embodiment, the first magnetizer40may be in a linear shape or a U-shape, and the second magnetizer55may be in a linear shape or a U-shape, but it is not limited thereto.

When both ends of the movable contact piece54are in contact with the pair of static contact leading-out terminals20, the second magnetizer55that move together with the movable contact piece54approaches to or contacts with the first magnetizer40, thereby forming a magnetic circuit around the movable contact piece54between the first magnetizer40and the second magnetizer55. When a short circuit current passes through the movable contact piece54, a magnetic attraction force along a contact pressure direction is generated between the first magnetizer40and the second magnetizer55. The magnetic attraction force can resist an electro-dynamic repulsion force between the movable contact piece54and the static contact leading-out terminals20due to the short circuit current, and ensure that the movable contact piece54and the static contact leading-out terminals20do not bounce off.

It should be noted that the first magnetizer40and the second magnetizer55are located at both sides of the movable contact piece54, respectively. When the movable contact piece54is powered on, the magnetic attraction force between the first magnetizer40and the second magnetizer55is a direct electromagnetic attraction force, so that it can more effectively resist the electro-dynamic repulsion force caused by short circuit current between the movable contact piece54and the static contact leading-out terminals20, and effectively improve the anti-short circuit ability.

As described above, a magnetic attraction force along the contact pressure direction may be generated between the first magnetizer40and the second magnetizer55. The magnetic attraction force can resist the electro-dynamic repulsion force caused by short circuit current between the movable contact piece54and the static contact leading-out terminals20, and ensure that the movable contact piece54and the static contact leading-out terminals20may not bounce off.

It can be understood that when current flowing through the movable contact piece54is constant, the magnitude of the magnetic attraction force generated between the first magnetizer40and the second magnetizer55is inversely proportional to a distance between the first magnetizer40and the second magnetizer55of the movable member53, that is, the smaller the distance, the greater the magnetic attraction force generated.

In order to resist the electromotive repulsion generated by the short circuit current and prevent the movable contact piece54from bouncing off the static contact leading-out terminals20, the distance between the first magnetizer40and the second magnetizer55should be designed to be small, as such, the magnetic attraction force between the first magnetizer40and the second magnetizer55can be increased.

For convenience to realize timely breaking, the distance between the first magnetizer40and the second magnetizer55should be designed to be large, as such, the magnetic attraction force between the first magnetizer40and the second magnetizer55may be reduced so as to avoid affecting the timely breaking due to the excessive magnetic attraction force.

As can be seen, when the distance between the first magnetizer40and the second magnetizer55is a certain value, it is impossible to take both the anti-short circuit ability and the limit breaking ability into account.

In the embodiment of the present disclosure, the first magnetizer40is movable relative to the movable member53through the moving part80, and then the distance between the first magnetizer40and the second magnetizer55is adjusted according to the value of the current flowing through movable contact piece54, so as to achieve the anti-short circuit ability and the limit breaking ability. In some embodiments, the distance between the first magnetizer40and the second magnetizer55is different, for example, when the first magnetizer40and the second magnetizer55are not parallel to each other, at different positions, the distances between the first magnetizer40and the second magnetizer55are different. In this case, the distance between the first magnetizer40and the second magnetizer55refers to the maximum distance between them.

It can be understood that in the embodiment that the movable member53includes a movable contact piece54, and does not include the second magnetizer55. When both ends of the movable contact piece54are in contact with the pair of static contact leading-out terminals20, current flows through movable contact piece54, thereby forming a magnetic circuit around the movable contact piece54along the length direction of the movable contact piece54. Due to the existence of the first magnetizer40, most of the magnetic field of the magnetic circuit will gather on the first magnetizer40and magnetize it, so that a magnetic attraction force along the contact pressure direction will be generated between the first magnetizer40and the movable contact piece54with current flowing, which can resist the electro-dynamic repulsion force caused by short circuit current between the movable contact piece54and the static contact leading-out terminals20, and ensure that the movable contact piece54and the static contact leading-out terminals20will not bounce off.

As can be seen, the first magnetizer40is movable relative to the movable contact piece54through the moving part80, and then the distance between the first magnetizer40and the movable contact piece54is adjusted according to the value of the current flowing through movable contact piece54, so as to take both the anti-short circuit ability and the limit breaking ability into account.

As shown inFIGS.5to10, the first magnetizer40moves between a first position P1and a second position P2through the moving part80. At the first position P1, a distance between the first magnetizer40and the second magnetizer55is a first distance H1. At the second position P2, a distance between the first magnetizer40and the second magnetizer55is a second distance H2, and the first distance H1is greater than the second distance H2. By setting the first magnetizer40movable, the distance between the first magnetizer40and the second magnetizer55can be adjusted according to the current value, and then the magnetic attraction force generated between the first magnetizer40and the second magnetizer55can be changed, so as to achieve the anti-short circuit and limit breaking.

As an example, at the second position P2, the second distance H2between the first magnetizer40and the second magnetizer55is equal to zero. That is, at the second position P2, the first magnetizer40and the second magnetizer55are in contact with each other. In this way, the magnetic attraction force between the first magnetizer40and the second magnetizer55can be maximized to improve the anti-short circuit ability.

Of course, in other embodiments, at the second position P2, the second distance H2between the first magnetizer40and the second magnetizer55may not be equal to zero. That is, at the second position P2, there is no contact between the first magnetizer40and the second magnetizer55, but there is a gap therebetween.

The first elastic part70is configured to provide an elastic force for the moving part80, so that the first magnetizer40has a trend of moving away from the movable member53. In the embodiments of the present disclosure, the first elastic part70is configured to provide an elastic force for the moving part80, so that the first magnetizer40has a trend of moving toward the first position P1.

Hereinafter, the achievement of the anti-short circuit current and the limit breaking according to the embodiment of the present disclosure may be illustrated in conjunction with theFIGS.5to10.

As shown inFIGS.5to7, when the relay is in a normal working state, the current value of the movable contact piece54is less than or equal to a threshold current, for example, the current value is less than 2000A. As the current value is small, the magnetic attraction force between the first magnetizer40and the second magnetizer55is also small, and the magnetic attraction force is less than the elastic pre-pressure of the first elastic part70, as such, the elastic force of the first elastic part70can offset the magnetic attraction force between the first magnetizer40and the second magnetizer55and allow the first magnetizer40to maintain in the first position P1. When the first magnetizer40is located in the first position P1, the distance between the first magnetizer40and the second magnetizer55is a first distance H1. For example, the first distance H1may be 1.5 mm, but it is not limited thereto.

It can be understood that the above threshold current can be adjusted according to different types of relays. For example, if the maximum breaking current of the relay is large, the threshold current may also be set to be large. This can ensure that the first magnetizer40can remain in the first position P1but not move toward the second position P2under the normal working state of the relay.

As shown inFIG.8toFIG.10, when the current value of the movable contact piece54is greater than the threshold current, the current is, for example, greater than 2000A. Since the magnetic attraction force between the first magnetizer40and the second magnetizer55is proportional to the current value, the greater the current value, the greater the magnetic attraction force between the first magnetizer40and the second magnetizer55. When the magnetic attraction force is greater than the elastic pre-pressure of the first elastic part70, the first magnetizer40is attracted by the magnetic attraction force to move toward a direction close to the second magnetizer55(that is, moving from the first position P1to the second position P2), so that the distance between the first magnetizer40and the second magnetizer55becomes smaller. Since the magnetic distance is inversely proportional to the magnetic attraction force, the smaller the magnetic distance, the greater the magnetic attraction force. When the short circuit current (much greater than the threshold current) flows over, a greater magnetic attraction force is generated between the first magnetizer40and the second magnetizer55. This magnetic attraction force can compress the first elastic part70to move the first magnetizer40to the second position P2, and the distance between the first magnetizer40and the second magnetizer55is a second distance H2. The second distance H2is smaller than the first distance H1. The distance becomes smaller, so that the magnetic attraction force between the first magnetizer40and the second magnetizer55becomes greater. Therefore, the first magnetizer40can attract the second magnetizer55through the great magnetic attraction force, and the magnetic attraction force can resist the electro-dynamic repulsion force generated by the short circuit current, thus ensure that the movable contact piece54does not bounce off the static contact leading-out terminals20, thus achieving anti-short circuit ability.

As can be seen, in the relay according to the embodiments of the present disclosure, the first magnetizer40is movably arranged within the contact container10through the moving part80, so that the distance between the first magnetizer40and the second magnetizer55can be adjusted according to the current value, thereby changing the magnitude of magnetic attraction force generated between the first magnetizer40and the second magnetizer55. This can meet the overload breaking requirement while satisfying the anti-short circuit ability.

It is worth mentioning that when the first magnetizer40moves from the first position P1to the second position P2, the first elastic part70is gradually compressed, so that a reverse elastic force exerted by the first elastic part70at the moving part80gradually increases. When the current value of the movable contact piece54is greater than the threshold current but not reach the short circuit current, the gradually increasing reverse elastic force can allow the first magnetizer40to maintain at a certain intermediate position between the first position P1and the second position P2. When the current value of the movable contact piece54reaches the short circuit current, a greater magnetic attraction force is generated between the first magnetizer40and the second magnetizer55. This magnetic attraction force is enough to overcome the reverse elastic force of the first elastic part70, so that the first magnetizer40continues to move to the second position P2and further compress the first elastic part70until the first magnetizer40moves to the second position P2.

Referring back toFIGS.4to6andFIG.8, the fixing member60includes two connectors610and a fixing part620. One end of each of the two connectors610is connected with the contact container10, and the other end of each of the two connectors610is connected with the fixing part620. The fixing part620may have a plate-shaped structure and be arranged in parallel to the yoke plate13.

The fixing part620of the fixing member60has a first side621facing the yoke plate13and a second side622arranged opposite to the first side621. The first elastic part70is arranged at the second side622, the first magnetizer40and the movable member53are arranged at the first side621, and the first magnetizer40is arranged between the first elastic part70and the movable member53. One end of the moving part80is connected with the first elastic part70, and the other end of the moving part is connected with the first magnetizer40. The first magnetizer40, the first clastic part70and the fixing member60are all located at a side of the movable contact piece54facing the static contact leading-out terminals20.

When the first magnetizer40is in the first position P1, the first magnetizer40abuts against the surface of the first side621of the fixing part620. When the first magnetizer40is in the second position P2, the first magnetizer40is separated from the fixing part620.

In the embodiments of the present disclosure, a top wall of the ceramic cover11of the contact container10is provided with a third through hole103. The connector610has a rod-shaped and passes through the third through hole103. One end of the connector610may be connected to the ceramic cover11in various ways, such as welding, riveting, screwing and bonding. The other end of the connector610may be connected to the fixing part620also in various ways, such as welding, riveting, screwing, bonding and clamping.

It can be understood that when one end of the connector610is connected to the ceramic cover11by welding, by welding the connector610to the top wall of the ceramic cover11, a metallization layer may be processed only at a periphery of the third through hole103on an outer wall surface of the top wall, instead of on an inner wall surface of the top wall. This is convenient for processing and simplifies the processing steps.

One end of the connector610may be connected to the outer wall surface of the ceramic cover11, the inner wall surface of the ceramic cover11, or both.

In the embodiments of the present disclosure, one end of the connector610is connected to the periphery of the third through hole103of the ceramic cover11.

It can be understood that the fixing part is connected with the ceramic cover11through the connector610. On the one hand, the magnetic attraction force can be transferred to the ceramic cover11, thus, there is no need for excessive coil holding force, thereby reducing power consumption of the coil of the relay and the volume of the relay, and improving anti-short circuit ability. On the other hand, because the fixing member60is connected to the ceramic cover11, the space of the contact chamber will not be occupied too much, thus ensuring the arc extinguishing space of the arc extinguishing unit and the movable space of the pushing rod assembly.

In addition, the fixing part620is connected with the connector610with a rod-shaped, thus the connection between the connector610and the fixing part620are in various ways, such as riveting, laser welding, clamping, bonding etc. There are rich connection methods.

As an example, the connector610is a solid rod. Therefore, the connector610and the fixing part620can be connected by riveting, which makes the connection more reliable. In addition, the solid rod has higher supporting strength and is less prone to deformation.

The moving part80may have various shapes, for example, the moving part80may be in a column shape. One end of the moving part80may be connected with the first elastic part70by welding, riveting, screwing and bonding, and the other end of the moving part80may also be connected with the first magnetizer40also by welding, riveting, screwing and bonding. As a modified embodiment, the shape of the moving part80may also have an inverted U shape, a top portion of the inverted U-shaped structure is connected with the first elastic part70, and the two side portions of the inverted U-shaped structure are connected with the two sides of the first magnetizer40, respectively.

As an example, the fixing part620is suspended from a top wall of the ceramic cover11by two connectors610. Meanwhile, the number of moving parts80may be two, but it is not limited thereto. It should be noted that the two connectors610may be connected to an inner wall surface of the top wall of the ceramic cover11and also to the outer wall surface of the top wall of the ceramic cover11.

When the moving part80is column shape, the fixing part620has a first perforation623which penetrates through a surface of the first side621and a surface of the second side622. The moving part80movably penetrates through the first perforation623. At the first position P1, the first magnetizer40abuts against the surface of the first side621of the fixing part620, and one end of the moving part80presses against the first elastic part70, so that the first elastic part70has elastic pre-pressure.

It can be understood that, on one aspect, the first magnetizer40and the first elastic part70are respectively arranged at two opposite sides of the fixing part620, so that there are no other parts between the first magnetizer40and the movable member53, as such, when a large current flows through the movable contact piece54of the movable member53, the gap between the first magnetizer40and the second magnetizer55can be minimized, and even the first magnetizer40is in contact with the second magnetizer55, so that the magnetic attraction force between the first magnetizer40and the second magnetizer55can be increased, to improve the anti-short circuit ability. On the other aspect, since the first elastic part70is arranged at the second side622of the fixing part620but not directly contact with the first magnetizer40, a magnetic pole surface of the first magnetizer40cannot be affected. On a further aspect, the moving part80is movably inserted into the first perforation623of the fixing part620, and one end of the moving part80presses against the first elastic part70, and the other end of the moving part80is connected with the first magnetizer40, so that the structure is more compact, the original structure of the relay cannot be changed, and an internal space of the relay cannot be occupied. Moreover, the structure is simple and convenient for assembling. In addition, the first magnetizer40directly acts on the moving part80, and the moving part80penetrates through the first perforation623of the fixing part620, so that the force arm, that is, the distance from the magnetic attraction force generated between the first magnetizer40and the second magnetizer55relative to a pivot formed by the moving part80and the first elastic part70, is not large, and thus developed stress is smaller.

As shown inFIG.5, the first elastic part70has a second perforation711aligning with the first perforation623. The moving part80passes through the first perforation623and the second perforation711. The moving part80includes a rod body820and a pressing cap810, wherein the pressing cap810is arranged at one end of the rod body820, and the pressing cap810is configured to press against the periphery of the second perforation711facing away from the side of the first magnetizer40.

When the first magnetizer40moves from the first position P1to the second position P2under the action of the magnetic attraction force, the pressing cap810of the moving part80presses against the first elastic part70to compress the first elastic part70.

It can be understood that one end of the moving part80may be fixedly or movably connected with the first elastic part70, as long as the moving part80can exert force on the first elastic part70to compress the first elastic part70when the first magnetizer40moves from the first position P1to the second position P2.

The first magnetizer40is provided with a third perforation420. The third perforation420corresponds to the positions of the first perforation623and the second perforation711. A step structure821is arranged at an outer periphery of the rod body820of the moving part80. The step structure821is configured to abut against the periphery of the third perforation420of the first magnetizer40facing the side of the first elastic part70.

When the moving part80, the first magnetizer40, the fixing member60and the first elastic part70are assembled, the moving part80sequentially passes through the second perforation711of the first elastic part70, the first perforation623of the fixing member60and the third perforation420of the first magnetizer40. The step structure821of the rod body820abuts against the periphery of the third perforation420. One end of the rod body820facing the movable member53is fixedly connected with the first magnetizer40, for example, by riveting. The pressing cap810presses against the periphery of the second perforation711.

As shown inFIG.5, the fixing part620of the fixing member60, the first magnetizer40and the first elastic part70are all located between the pair of static contact leading-out terminals20. In this way, the fixing part620, the first magnetizer40and the first elastic part70do not occupy a volume of the relay in a height direction, and an overall structure of the relay is more compact, which is conducive to the realization of volume miniaturization.

The moving part80is movably arranged at a side of the movable member53facing the static contact leading-out terminals20, and the moving part80is located between a pair of static contact leading-out terminals20.

In an embodiment, both the moving part80and the fixing member60are made of metal materials to improve connection strength.

As shown inFIGS.11and12, the first elastic part70may be an elastic reed710, which can reduce the space occupied by the elastic reed710and provide a moving space for the first magnetizer40.

The second elastic part56may also be an elastic reed, which can also reduce the space occupied by the second elastic part56and provide a moving space for the first magnetizer40.

Avoidance notches701are arranged at both ends of the elastic reed710, and the connector610passes through the avoidance notches701. In the embodiments of the present disclosure, the avoidance notches701are arranged at both ends of the first elastic part70, and the two connectors610pass through the avoidance notches701, respectively. By arranging the avoidance notches701on the first elastic part70, the connector610can pass through the first elastic part70to connect with the fixing part620, so that the connector610, the fixing part620, the first elastic part70and the first magnetizer40after being assembled can be more compact, and cannot occupy the internal space of the relay.

Of course, the elastic reed710may not be provided with the avoidance notches701; alternatively, the elastic reed710is provided with a hole through which the connector610passes.

The first magnetizer40may include a plurality of magnetic conductive sheets410stacked to one another. On one aspect, the magnetic conductive sheets410are relatively thin, and may be made of thin strip, at low material cost and easy operation. On the other aspect, the number of the magnetic conductive sheets410may be flexibly adjusted according to the magnitude of the short circuit current, thereby increasing or decreasing the thickness of the first magnetizer40.

It can be understood that the second magnetizer55may also include a plurality of magnetic conductive sheets410stacked to one another.

Of course, the first magnetizer40and the second magnetizer55respectively may be an integral piece instead of a plurality of magnetic conductive sheets410stacked together.

As shown inFIGS.13and14, as a modified embodiment, the first elastic part70may also be a spring720. One end of the spring720abuts against the fixing part620, and the other end of the spring720abuts against a pressing piece730. One end of the moving part80is connected with the pressing piece730and pressed against the other end of the spring720through the pressing piece730, and the other end of the moving part80passes through the first perforation623of the fixing part620and is connected with the first magnetizer40.

As shown inFIG.15, the relay according to the second embodiment has substantially the same structure as the relay according to the first embodiment. Therefore, in the description of the second embodiment of the relay below, the structure already described in the first embodiment is not repeated. Additionally, the same reference numbers are used to indicate the same structures as described in the first embodiment. Therefore, in the following description of this embodiment, the differences from the relay of the first embodiment will be mainly described.

In the relay according to the second embodiment, the movable member53includes a movable contact piece54, and does not include the second magnetizer55. When both ends of the movable contact piece54are in contact with the pair of static contact leading-out terminals20, current flows through movable contact piece54, thereby forming a magnetic circuit around the movable contact piece54along the length direction of the movable contact piece54. Due to the existence of the first magnetizer40, most of the magnetic field of the magnetic circuit will gather on the first magnetizer40and magnetize it, so that a magnetic attraction force along the contact pressure direction will be generated between the first magnetizer40and the movable contact piece54with current flowing, which can resist the electro-dynamic repulsion force caused by short circuit current between the movable contact piece54and the static contact leading-out terminals20, and ensure that the movable contact piece54and the static contact leading-out terminals20will not bounce off.

The first magnetizer40is movable relative to the movable contact piece54through the moving part80, and then the distance between the first magnetizer40and the movable contact piece54is adjusted according to the value of the current flowing through movable contact piece54, so as to take both the anti-short circuit ability and the limit breaking ability into account.

As shown inFIGS.16to19, the relay according to the third embodiment has substantially the same structure as the relay according to the first embodiment. Therefore, in the following description of the relay of the third embodiment, the structure already described in the first embodiment will not be repeated. In addition, the same reference numbers are used to indicate the same structures as described in the first embodiment. Therefore, in the following description of this embodiment, the differences from the relay of the first embodiment are mainly described.

In the relay according to the third embodiment, the connector610includes an inserting part611and a flange612. The inserting part611is inserted into the third through hole103, and one end of the inserting part611facing the fixing part620is bonded or welded to the fixing part620. The flange612protrudes from one end of the inserting part611far away from the fixing part620, and the flange612is welded with the periphery of the third through hole103of the ceramic cover11.

As an example, the inserting part611has a tubular structure, a bottom surface of the tubular structure is welded with a side surface of the fixing part620facing away from the first magnetizer40, and the flange612is arranged at an opening of the tubular structure.

Of course, the inserting part611is not limited to the tubular, for example cylindrical structure.

It should be noted that the movable member53of the relay according to the third embodiment of the present invention can also be designed to include the movable spring54, but not include the second magnetizer55.

It can be understood that the various examples/embodiments provided by the present disclosure can be combined with each other without any contradictions, and will not be exemplified herein.

In the embodiments of the present disclosure, the terms “first”, “second”, “third”, “a pair of” and “a/an” are used only for the purpose of illustration, but not to be construed as indicating or implying relative importance. The term “a plurality of” refers to two or more, unless specifically defined otherwise. the terms “connect”, “fixedly connect”, ‘install” and “assemble” shall be broadly understood, unless otherwise explicitly specified and defined, for example, may be fixed connection, detachable connection or integral connection; the terms “installation”, “connection” and “fixed connection” may be direct connection, indirect connection through an intermediate media, or internal communication between two elements. For those ordinary skills in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood depending on specific context.

In the description of the embodiment of the present disclosure, it should be understood that the orientation or position relationship indicated by the terms “upper”, “lower”, “left”, “right”, “front” and “rear” is based on the orientation or position relationship shown in the attached drawings, and is only for the convenience of describing the embodiments of the present disclosure and simplifying the description, rather than indicating or implying that the device or unit must have a specific direction and is constructed and operated in a specific orientation. Therefore, these terms are not to be construed as limiting the scope of the present disclosure.

In the description of this specification, the terms “one embodiment”, “some embodiments” and “specific embodiments” mean that specific features, structures, materials or characteristics described in connection with this embodiment or example are included in at least one embodiment of the embodiments or example of the present disclosure. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

The above is only the preferred embodiments of the embodiments of the present disclosure and is not intended to limit the embodiments of the present disclosure. For the person skilled in the art, various modifications and variations can be made to the embodiments of the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present disclosure should be included within the protection scope of the embodiments of the present disclosure.