CN220963167U - Relay device - Google Patents

Abstract

The application discloses a relay which comprises a pair of fixed contact leading-out ends, a plurality of movable reeds and a short circuit resistant structure. The two ends of each movable reed along the first direction are respectively used for contacting or separating with a pair of stationary contact leading-out ends; the first direction is the arrangement direction of the pair of stationary contact leading-out ends. The contact gap between one movable reed of the movable reeds and the fixed contact leading-out end is smaller than the contact gap between the rest movable reeds and the fixed contact leading-out end; the short-circuit-resistant structure is used for forming suction force in the contact closing direction on the movable reeds; the suction force on the movable reed with smaller contact clearance is smaller than that on the rest movable reeds.

Description

Relay device

Technical Field

The application relates to the technical field of electronic control devices, in particular to a relay.

Background

A relay is an electronic control device having a control system (also called an input loop) and a controlled system (also called an output loop), which is generally used in an automatic control circuit. A relay is in fact an "automatic switch" that uses a smaller current to control a larger current. Therefore, the circuit plays roles of automatic adjustment, safety protection, circuit switching and the like.

The high-voltage direct current relay is one of the relays, and in order to solve the problem that contacts of the high-voltage direct current relay spring out due to electric repulsive force generated by short circuit current, a short circuit resistant structure is usually arranged in the related art. However, since the short circuit resistance and breaking capacity exhibit negative correlation, the breaking capacity is weakened. Therefore, the structure of the relay in the related art is still to be further optimized.

Disclosure of utility model

The embodiment of the application provides a relay which is beneficial to realizing limit breaking among contacts and can realize delayed breaking of the contacts so as to solve the problems in the related art.

The relay of the embodiment of the application comprises:

A pair of stationary contact terminals;

the movable contact lead-out terminals are respectively connected with the movable contact lead-out terminals in a first direction; the first direction is the arrangement direction of the pair of stationary contact leading-out ends; the contact gap between at least one movable reed of the movable reeds and the fixed contact leading-out end is smaller than the contact gap between the rest movable reeds and the fixed contact leading-out end; and

The short-circuit resistant structure is used for forming suction force in the contact closing direction on the movable contact springs; the suction force on the movable reed with smaller contact clearance is smaller than the suction force on each other movable reed.

According to some embodiments of the application, the anti-short structure comprises:

The first magnetizer is arranged on one side of the movable contact spring towards the leading-out end of the fixed contact; the first magnetizer is at least partially overlapped with each movable reed along the contact closing direction; and

The movable reed comprises at least one second magnetizer, one side, opposite to the stationary contact leading-out end, of the movable reeds except for the movable reed with smaller contact gaps is fixedly connected with the second magnetizer, and the first magnetizer is used for forming a magnetic conduction loop with the at least one second magnetizer.

According to some embodiments of the application, the relay further comprises a contact container, the contact container is provided with a pair of first through holes, and a pair of stationary contact leading-out ends respectively penetrate through the pair of first through holes; the movable reeds are arranged in the contact container;

The first magnetizer is arranged in the contact container and is fixedly arranged relative to the contact container.

According to some embodiments of the application, the contacting vessel comprises:

a yoke plate; and

The insulating cover is covered on one side surface of the yoke plate and is provided with a pair of first through holes; the first magnetizer is connected to the insulating cover through a connecting piece.

According to some embodiments of the application, the insulating cover is provided with a third through hole;

the connecting piece is rod-shaped and penetrates through the third through hole; one end of the connecting piece is connected with the insulating cover, and the other end of the connecting piece is connected with the first magnetizer.

According to some embodiments of the application, the insulating cover includes a ceramic cover and a frame piece, the ceramic cover being connected to the yoke plate through the frame piece;

the ceramic cover is provided with a pair of first through holes; the first magnetizer is connected to the ceramic cover through the connecting piece.

According to some embodiments of the application, the anti-short structure comprises:

At least one first magnetizer arranged at one side of the movable contact spring towards the leading-out end of the stationary contact; the number and the positions of at least one first magnetizer respectively correspond to the number and the positions of the rest movable reeds along the contact closing direction; and

And one side, opposite to the stationary contact leading-out end, of the movable spring leaves except for the movable spring leaves with smaller contact gaps is fixedly connected with one second magnetizer, and the corresponding first magnetizer and second magnetizer are used for forming a magnetic conduction loop.

According to some embodiments of the application, the relay further comprises:

The movable spring plates are arranged on the pushing rod assembly through elastic assemblies, and the elastic assemblies are used for providing contact pressure for the movable spring plates;

A plurality of the first magnetizers are mounted on the push rod assembly.

According to some embodiments of the application, the direction of movement of the movable spring is defined as the second direction; the push rod assembly includes:

a push rod;

The contact support comprises a top wall and two side walls, one ends of the two side walls are respectively connected to two sides of the top wall along a third direction, and the other ends of the two side walls are respectively connected with the pushing rod; the first direction, the second direction and the third direction are perpendicular to each other;

Wherein a plurality of the first magnetizers are connected to the top wall.

According to some embodiments of the application, the top wall comprises a first section, a second section and a bending section, wherein the bending section is connected to the first section and is connected to the second section in a bending way from the first section to a direction away from the pushing rod; one ends of the two side walls are respectively connected with the first section and the second section;

At least one first magnetizer is connected to one side surface of the second section, which faces the pushing rod, and the one side surface of the first magnetizer, which faces the pushing rod, is flush with one side surface of the first section, which faces the pushing rod.

According to some embodiments of the application, the suction force on the movable reed with the smaller contact gap is zero.

According to some embodiments of the application, the anti-short structure comprises:

And one side of the movable reed, which faces the stationary contact leading end, is provided with one first magnetizer except for the movable reed with smaller contact gaps.

According to some embodiments of the application, a plurality of the movable springs are arranged side by side along a third direction;

The moving direction of the movable reed is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

The relay of the embodiment of the application comprises:

A pair of stationary contact terminals;

The movable contact lead-out terminals are respectively connected with the movable contact lead-out terminals in a first direction; the first direction is the arrangement direction of the pair of stationary contact leading-out ends; the contact gaps between the movable reeds and the fixed contact leading-out ends are equal; and

The short-circuit resistant structure is used for forming suction force in the contact closing direction on the movable contact springs; wherein the suction force on at least one movable reed of the plurality of movable reeds is smaller than the suction force on the rest movable reeds.

According to some embodiments of the application, the anti-short structure comprises:

The first magnetizer is arranged on one side of the movable contact spring towards the leading-out end of the fixed contact; the first magnetizer is at least partially overlapped with each movable reed along the contact closing direction; and

The movable contact comprises at least one second magnetizer, one side, opposite to the leading-out end of the fixed contact, of the movable contact except for the movable contact with smaller suction force, of the movable contact is fixedly connected with the second magnetizer, and the first magnetizer is used for forming a magnetic conduction loop with the at least one second magnetizer.

According to some embodiments of the application, the anti-short structure comprises:

At least one first magnetizer arranged at one side of the movable contact spring towards the leading-out end of the stationary contact; the number and the positions of at least one first magnetizer respectively correspond to the number and the positions of the rest movable reeds along the contact closing direction; and

The movable reed comprises at least one second magnetizer, wherein the movable reeds with smaller suction force are arranged in the movable reeds, one side of the rest movable reeds, which is opposite to the leading-out end of the fixed contact, is fixedly connected with one second magnetizer, and the corresponding first magnetizer and second magnetizer are used for forming a magnetic conduction loop.

According to some embodiments of the application, the suction force on one of the movable springs is zero.

According to some embodiments of the application, the anti-short structure comprises:

And one side of the movable reed, which faces the leading end of the fixed contact, is provided with one first magnetizer except for the movable reed with smaller suction force.

According to some embodiments of the application, a plurality of the movable springs are arranged side by side along a third direction;

The moving direction of the movable reed is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

One embodiment of the above application has at least the following advantages or benefits:

in the relay provided by the embodiment of the application, in the limit breaking process, on one hand, the movable reeds form a parallel circuit, so that the shunt effect is realized, the current value flowing through each movable reed is reduced, and the breaking of the movable contact is facilitated; on the other hand, the movable reed with smaller contact clearance can be disconnected later than other movable reeds, so that the movable reeds with smaller contact clearance still contact with the stationary contact leading-out end after the other movable reeds are disconnected. Because the suction force on the movable reed with smaller contact clearance is smaller than the suction force of the rest movable reeds, when the movable reed with smaller contact clearance breaks, the suction force resisting the short-circuit structure is not needed or the suction force resisting the short-circuit structure is very small, thereby being beneficial to the breaking of the whole relay. When the short-circuit current is conducted, the suction force of the short-circuit resistant structure on the movable reed with smaller contact gaps is smaller than that of the other movable reeds, so that the movable reeds with smaller contact gaps can be sprung away by the electric repulsive force among the contacts in preference to the other movable reeds, the current of the other movable reeds rises at the moment, the instant suction force of the short-circuit resistant structure is also increased instantaneously, the short-circuit resistant capability is improved, the suction force on the other movable reeds can play a role of delaying disconnection, and the reaction time is strived for the short-circuit disconnection of the whole circuit. Therefore, the relay provided by the embodiment of the application is beneficial to realizing limit breaking among contacts, and can realize delayed breaking of the contacts during short circuit, so that the working reliability of the relay is ensured, and the service life of a product is prolonged.

Drawings

Fig. 1 is an exploded schematic view of a relay according to an exemplary embodiment.

Fig. 2 is a schematic top view of the sealing unit according to the first exemplary embodiment.

Fig. 3 is a cross-sectional view taken along A-A in fig. 2.

Fig. 4 is an exploded schematic view of the sealing unit according to the first exemplary embodiment.

Fig. 5 is a schematic view showing contact gap inequality between two movable reeds and a stationary contact terminal according to an exemplary embodiment.

Fig. 6 is a schematic view showing contact gap inequality between two movable reeds and a stationary contact terminal according to another exemplary embodiment.

Fig. 7 is a schematic view showing one of the two movable reeds being in contact with the stationary contact terminal and the other movable reed not being in contact yet, according to an exemplary embodiment.

Fig. 8 is a schematic diagram showing both movable reeds contacting a stationary contact terminal according to an exemplary embodiment.

Fig. 9 to 12 are schematic views showing the short circuit resisting structure and the plurality of movable reeds of four different embodiments, respectively.

Fig. 13 is a schematic top view of a sealing unit according to a second exemplary embodiment.

Fig. 14 is a cross-sectional view taken along B-B in fig. 13.

Fig. 15 is an exploded schematic view of a sealing unit according to a second exemplary embodiment.

Wherein reference numerals are as follows:

1. Relay device

10. Outer casing

11. First shell body

11A, exposed holes

12. Second shell

20. Coil unit

21. Coil rack

22. Coil

30. Arc extinguishing unit

31. Arc extinguishing magnet

32. Yoke iron clamp

40. Sealing unit

1000. Contact container

1001. Contact chamber

1002. First through hole

1100. Insulating cover

1110. Ceramic cover

1111. Third through hole

1120. Frame sheet

1200. Yoke iron plate

1210. Second through hole

2000. Stationary contact leading-out end

2001. The convex part

2002. Groove part

3000. Moving assembly

3110. Movable reed

3200. Push rod assembly

3210. Push rod

3211. Base seat

3212. Rod part

3213. Card and card

3220. Contact support

3221. Top wall

3221A, first section

3221B, second section

3221C, bending section

3222. Side wall

3223. Clamping hole

3300. Elastic assembly

4000. Magnetic circuit part

4300. Static iron core

4310. Through hole

4400. Movable iron core

4500. Reset piece

5000. Metal cover

6000. Short-circuit resistant structure

6100. First magnetizer

6200. Second magnetizer

100. First movable reed

200. Second movable reed

300. Connecting piece

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.

As shown in fig. 1, the relay 1 of the embodiment of the present application includes a case 10, a coil unit 20, an arc extinguishing unit 30, and a sealing unit 40. The sealing unit 40 is disposed in the housing 10, and the top of the stationary contact lead-out terminal of the sealing unit 40 is exposed to the outer surface of the housing 10 through the exposure hole 11a of the housing 10. The coil unit 20 and the arc extinguishing unit 30 are both disposed within the housing 10.

It will be understood that the terms "comprising," "including," and "having," and any variations thereof, are intended to cover non-exclusive inclusions in the embodiments of the application. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may alternatively include other steps or elements not listed or inherent to such process, method, article, or apparatus.

As an example, the case 10 includes a first case 11 and a second case 12, and the first case 11 and the second case 12 are connected to form a chamber for accommodating the coil unit 20, the arc extinguishing unit 30, and the sealing unit 40. In the embodiment of the application, the exposing hole 11a is disposed on the first housing 11.

The arc extinguishing unit 30 is used for extinguishing an arc generated between the stationary contact leading-out terminal and the movable reed of the sealing unit 40.

As an example, the arc extinguishing unit 30 includes two arc extinguishing magnets 31. The arc extinguishing magnets 31 may be permanent magnets, and each of the arc extinguishing magnets 31 may be substantially rectangular parallelepiped. The two arc extinguishing magnets 31 are respectively disposed at both sides of the sealing unit 40, and are disposed opposite to each other along the length direction of the movable reed.

By providing two opposing arc extinguishing magnets 31, a magnetic field can be formed around the stationary contact leading end and the movable reed. Therefore, the arc generated between the stationary contact leading-out end and the movable reed is elongated in a direction away from each other by the magnetic field, and arc extinction is realized.

The arc extinguishing unit 30 further includes two yoke clips 32, and the two yoke clips 32 are disposed corresponding to positions of the two arc extinguishing magnets 31. And, two yoke clips 32 surround the sealing unit 40 and the two arc extinguishing magnets 31. Through the design that yoke iron clamp 32 encircles arc extinguishing magnet 31, the magnetic field that can avoid arc extinguishing magnet 31 to produce outwards diffuses, influences the arc extinguishing effect. The yoke iron clip 32 is made of a soft magnetic material. Soft magnetic materials may include, but are not limited to, iron, cobalt, nickel, alloys thereof, and the like.

As shown in fig. 2 to 4, the sealing unit 40 includes a contact container 1000, a pair of stationary contact terminals 2000, a moving assembly 3000, and a magnetic circuit portion 4000.

The contact container 1000 is a stationary member for accommodating the contact set and is a device mainly composed of a housing and having a chamber. Further, the contact container 1000 may be formed by connecting a plurality of components in a predetermined assembly manner.

The contact vessel 1000 has a contact chamber 1001 inside. The contact container 1000 may include an insulation cover 1100 and a yoke plate 1200, the insulation cover 1100 being provided on one side surface of the yoke plate 1200, the insulation cover 1100 and the yoke plate 1200 enclosing a contact chamber 1001 together.

The insulating housing 1100 includes a ceramic housing 1110 and a frame piece 1120. The ceramic cover 1110 is connected to the yoke plate 1200 through a frame piece 1120. The frame 1120 may be a metal member having a ring-shaped structure, such as iron-nickel alloy, and one end of the frame 1120 is connected to the opening edge of the ceramic housing 1110, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece 1120 is connected to the yoke plate 1200, and may be welded by laser, soldering, resistance welding, gluing, or the like. A frame 1120 is provided between the ceramic cover 1110 and the yoke plate 1200 to facilitate the connection of the ceramic cover 1110 and the yoke plate 1200.

The contact vessel 1000 also has a pair of first through holes 1002, the first through holes 1002 being in communication with the contact chamber 1001. The first through hole 1002 is configured to allow the stationary contact terminal 2000 to pass therethrough. In an embodiment of the present application, the first through hole 1002 is formed on the ceramic cover 1110.

A pair of stationary contact terminals 2000 are connected to the ceramic housing 1110 of the contact vessel 1000, with at least a portion of each stationary contact terminal 2000 being located within the contact chamber 1001. One of the pair of stationary contact terminals 2000 serves as a terminal through which current flows, and the other serves as a terminal through which current flows.

A pair of stationary contact terminals 2000 are inserted into a pair of first through holes 1002 in one-to-one correspondence and connected to the ceramic cover 1110, for example, by soldering.

The bottom of the stationary contact terminal 2000 serves as a stationary contact, and the stationary contact may be integrally or separately provided at the bottom of the stationary contact terminal 2000.

With continued reference to fig. 3 and 4, the movable assembly 3000 includes a plurality of movable springs 3110, a push rod assembly 3200 and an elastic assembly 3300 arranged side by side. The movable springs 3110 are disposed in the insulating housing 1100 and are mounted to the push rod assembly 3200 through the elastic members 3300. Both ends of each movable contact 3110 in the first direction D1 are for contact with or separation from the pair of stationary contact terminals 2000, respectively. The first direction D1 is an arrangement direction of the pair of stationary contact terminals 2000. It will be appreciated that the plurality of movable reeds 3110 are arranged side by side, and thus the number of contact points formed by the plurality of movable reeds 3110 and each stationary contact lead-out terminal 2000 is plural, for example, two, three, four, or the like.

Note that, if a pair of stationary contact terminals 2000 and a plurality of movable springs 3110 are regarded as one set of combinations, the relay of the embodiment of the present application may include a plurality of sets of combinations. Each movable spring 3110 may include a movable spring body and movable contacts provided at both ends of the movable spring body. The movable contact may be a separate part and connected to the movable spring body. Of course, the movable contact may be integrally formed on the movable spring body.

In an embodiment of the present application, the movable assembly 3000 includes two movable springs 3110 arranged side by side. One end of the two movable springs 3110 is for contact with or separation from the stationary contact of one of the stationary contact lead-out terminals 2000, and the other end of the two movable springs 3110 is for contact with or separation from the stationary contact of the other stationary contact lead-out terminal 2000. Further, one end of the two movable reeds 3110 forms two contact points with one of the stationary contact outgoing terminals 2000, and the other end of the two movable reeds 3110 forms two contact points with the other stationary contact outgoing terminal 2000.

In other embodiments, the number of movable springs 3110 may be three, four, five, etc.

It can be appreciated that the movable assembly 3000 includes a plurality of movable reeds 3110, and two ends of the movable reeds 3110 in the first direction D1 are respectively contacted to or separated from the pair of stationary contact terminals, so that the plurality of movable reeds 3110 are respectively contacted to the pair of stationary contact terminals 2000 in the first direction D1 to form a reliable parallel circuit, because the plurality of movable reeds 3110 are not limited to each other. The number of contact points formed by the movable contact 3110 and one stationary contact terminal 2000 is equal to or greater than two, so that the current-dividing effect is achieved. In addition, according to the principle that the size of the electric repulsive force is in direct proportion to the square of the current, the size of the electric repulsive force of each contact is obviously reduced, the improvement of short circuit resistance is facilitated, and the reliability of the relay is improved.

As shown in fig. 3 and 4, the movement direction of the movable spring 3110 is defined as a second direction D2, and a direction perpendicular to the first direction D1 and the second direction D2 is defined as a third direction D3. The push rod assembly 3200 includes a push rod 3210 and a contact support 3220. The contact support 3220 includes a top wall 3221 and two side walls 3222, one ends of the two side walls 3222 are integrally connected to two side edges of the top wall 3221 along the third direction D3, and the other ends of the two side walls 3222 are connected to the pushing rod 3210. A plurality of movable springs 3110 are mounted within a space enclosed by the contact holder 3220 through elastic members 3300. Of course, in other embodiments, one ends of the two side walls 3222 may be separately connected to two sides of the top wall 3221 along the third direction D3.

The bottom end of each side wall 3222 of the contact holder 3220 is provided with a clamping hole 3223. The push rod 3210 includes a base 3211 and a rod portion 3212, and the base 3211 is connected to one axial end of the rod portion 3212. Two sides of the base 3211 are provided with a card 3213, and the two cards 3213 are respectively clamped into two card holes 3223 of the contact support 3220, so that the base 3211 is fixed with the contact support 3220. The elastic member 3300 is disposed between the plurality of movable springs 3110 and the base 3211 for applying an elastic force to the plurality of movable springs 3110 toward the top wall 3221 to provide a contact pressure.

It is appreciated that the spring assembly 3300 can be used to flexibly support a plurality of movable springs 3110 to provide contact pressure.

Of course, in other embodiments, the push rod assembly 3200 may take other configurations, which will not be described herein.

Wherein a plurality of movable reeds 3110 are arranged side by side in the third direction D3.

Referring to fig. 3 and 4, the yoke plate 1200 has a second through hole 1210, the second through hole 1210 penetrates through two opposite sides of the yoke plate 1200 in a thickness direction of the yoke plate 1200, and the second through hole 1210 communicates with the contact chamber 1001 of the contact container 1000. The rod portion 3212 is axially movably disposed through the second through hole 1210. A base 3211 at one axial end of the stem 3212 is provided within the contact chamber 1001.

The sealing unit 40 further includes a metal cap 5000, the metal cap 5000 is connected to a side of the yoke plate 1200 facing away from the insulation cap 1100, and the metal cap 5000 is provided to cover the second through hole 1210 of the yoke plate 1200. The metal cover 5000 encloses a cavity with the yoke plate 1200 for accommodating the stationary core 4300 and the movable core 4400 of the magnetic circuit portion 4000.

Referring back to fig. 1, the coil unit 20 includes a bobbin 21 and a coil 22, and the bobbin 21 has a hollow cylindrical shape and is formed of an insulating material. The metal cover 5000 is inserted into the coil housing 21. The coil 22 surrounds the bobbin 21.

As shown in fig. 3 and 4, the magnetic circuit portion 4000 includes a stationary core 4300, a movable core 4400, and a reset member 4500. The stationary core 4300 is fixedly disposed within the metal cover 5000, and a portion of the stationary core 4300 extends into the second through-hole 1210. The stationary core 4300 has a through hole 4310, and the through hole 4310 is disposed corresponding to the second through hole 1210 for the rod portion 3212 to penetrate therethrough. The movable iron core 4400 is movably disposed in the metal cap 5000 and is disposed opposite the stationary iron core 4300 in an axial direction of the rod portion 3212, and the movable iron core 4400 connects the rod portion 3212 for being attracted by the stationary iron core 4300 when the coil 22 is energized. The plunger 4400 and the rod portion 3212 may be bolted, riveted, welded, or otherwise connected.

The reset member 4500 is located inside the metal cap 5000 and is disposed between the stationary core 4300 and the movable core 4400 for resetting the movable core 4400 when the coil 22 is powered off. The reset element 4500 may be a spring and is sleeved outside the stem portion 3212.

When the coil 22 is energized, the magnetic circuit portion 4000 can drive the push rod assembly 3200 to move upward through the rod portion 3212. When the movable spring 3110 contacts the stationary contact terminal 2000, the movable spring 3110 is stopped by the stationary contact terminal 2000, and the rod portion 3212 and the base 3211 still continue to move upward until the over-stroke is completed.

As shown in fig. 3 and 4, the relay 1 further includes a short-circuit resisting structure 6000 for forming a suction force in a contact closing direction on the plurality of movable reeds 3110, the suction force being capable of resisting an electric repulsive force generated by the short-circuit current between the movable reeds 3110 and the stationary contact lead-out terminal 2000, and preventing the movable reeds 3110 and the stationary contact lead-out terminal 2000 from being sprung.

Wherein, the contact gap between at least one movable contact spring 3110 of the plurality of movable contact springs 3110 and the stationary contact lead-out terminal 2000 is smaller than the contact gap between the rest of movable contact springs 3110 and the stationary contact lead-out terminal 2000; the suction force on the movable reed 3110 whose contact gap is smaller than that on the remaining respective movable reeds 3110.

Note that the suction force on the movable reed 3110 with the smaller contact gap is smaller than the suction force on the remaining respective movable reeds 3110 may include the following cases: the suction force on the movable reed 3110 with the smaller contact gap is zero; or the suction force on each movable reed 3110 is greater than 0, and the suction force on the movable reed 3110 with the smaller contact gap is smaller than the suction force on the remaining respective movable reeds 3110.

When the number of movable reeds 3110 is three or more, the contact gap between one movable reed 3110 and the stationary contact terminal 2000 is the smallest, and the contact gaps between the remaining movable reeds 3110 and the stationary contact terminal 2000 may be equal to each other or may be unequal to each other. The suction force on the movable spring 3110 with the smallest contact gap is smallest, and the suction forces on the remaining movable springs 3110 may be equal to each other or may be unequal to each other.

Further, when the number of movable reeds 3110 is three or more, it is possible that the contact gap between two movable reeds 3110 and the stationary contact terminal 2000 is equal and smallest, and the contact gap between the remaining one movable reed 3110 and the stationary contact terminal 2000 is larger than the contact gap of the two movable reeds 3110.

Here, as to how the contact gaps between the plurality of movable reeds 3110 are designed to be unequal, a manner as shown in fig. 5 and 6 may be adopted.

For convenience of explanation, the number of movable reeds 3110 is taken as two below, and the two movable reeds 3110 are defined as a first movable reed 100 and a second movable reed 200, respectively, a contact gap between the first movable reed 100 and the stationary contact terminal 2000 is smaller than a contact gap between the second movable reed 200 and the stationary contact terminal 2000, and suction force on the first movable reed 100 is zero, or suction force on the first movable reed 100 is not zero and is smaller than suction force on the second movable reed 200.

As shown in fig. 5, the bottom surface of the stationary contact terminal 2000 is a plane, and the thicknesses of the first movable reed 100 and the second movable reed 200 are not equal, for example, the thickness of the first movable reed 100 is greater than the thickness of the second movable reed 200, so that the contact gap t1 between the first movable reed 100 and the stationary contact terminal 2000 is smaller than the contact gap t2 between the second movable reed 200 and the stationary contact terminal 2000.

As shown in fig. 6, the bottom surface of the stationary contact terminal 2000 is a stepped surface, for example, a protrusion 2001 of the stepped surface corresponds to the first movable contact spring 100, and a recess 2002 of the stepped surface corresponds to the second movable contact spring 200, so that a contact gap t1 between the first movable contact spring 100 and the protrusion 2001 is smaller than a contact gap t2 between the second movable contact spring 200 and the recess 2002.

In the following, taking the embodiment shown in fig. 5 as an example, and referring to fig. 7 and 8, when the contact gaps between the first movable reed 100 and the second movable reed 200 and the stationary contact terminal 2000 are different, the on-off sequence of the first movable reed 100 and the second movable reed 200 is also different.

In the closing process, since the gap between the movable iron core 4400 and the stationary iron core 4300 is a certain value, when the push rod assembly 3200 drives the first movable reed 100 and the second movable reed 200 to move toward the stationary contact terminal 2000 at the same time, the contact gap of the first movable reed 100 is smaller, so that the first movable reed 100 contacts the stationary contact terminal 2000 before the second movable reed 200, i.e., the first movable reed 100 with the smaller contact gap is turned on. At this time, the second movable contact spring 200 has not yet contacted the stationary contact terminal 2000 (see fig. 7).

Then, the push rod assembly 3200 continues to move in a direction approaching the stationary contact terminal 2000, and since the first movable contact spring 100 is already in contact with the stationary contact terminal 2000 and cannot continue to move at this time, only the second movable contact spring 200 moves in a direction approaching the stationary contact terminal 2000 until the second movable contact spring 200 is also in contact with the stationary contact terminal 2000 (see fig. 8). At this time, the plunger 4400 has not been in contact with the stator core 4300. During the movement of second movable reed 200 from the position shown in fig. 7 to the position shown in fig. 8, first movable reed 100 is not moved all the time, but is in the overtravel stage.

After both the first movable reed 100 and the second movable reed 200 are in contact with the stationary contact terminal 2000, the movable iron core 4400 continues to move a distance until the movable iron core 4400 is in contact with the stationary iron core 4300. At this stage of the continued movement of the plunger 4400, neither the first movable reed 100 nor the second movable reed 200 is continued to move, and at this time, both the first movable reed 100 and the second movable reed 200 are in the over-stroke stage.

It can be seen that the overstroke distance of first movable reed 100 is greater than that of second movable reed 200.

In the breaking process, breaking may be performed sequentially in the order of fig. 8 to 7 to 5. The breaking process is a process of releasing the overtravel and contact gap for the first movable reed 100 and the second movable reed 200. Since the contact gap of the first movable contact spring 100 is small, the overstroke distance of the first movable contact spring 100 is large. Therefore, in the breaking process, the second movable contact spring 200 is broken before the first movable contact spring 100, that is, the first movable contact spring 100 with smaller contact gap is broken later.

From this, it can be concluded that: during the closing process, the first movable contact spring 100 is turned on before the second movable contact spring 200; during the breaking process, the second movable contact spring 200 is broken prior to the first movable contact spring 100.

In the following, the breaking process of the two movable reeds 3110 will be described in detail by taking the number of the movable reeds 3110 as two as an example, in the case where the two movable reeds 3110 are respectively supplied with a limit breaking current and a short-circuit current. The two movable springs 3110 are the first movable spring 100 and the second movable spring 200, respectively.

When a limit breaking current (for example, 2 kA) is passed, the first movable reed 100 and the second movable reed 200 constitute a parallel circuit, so that the first movable reed 100 and the second movable reed 200 both pass a current of 1 kA. Since the second movable contact spring 200 is broken before the first movable contact spring 100 in the breaking process, when the second movable contact spring 200 is just broken, the first movable contact spring 100 still contacts the stationary contact lead-out terminal 2000, so that 2kA of current entirely flows into the first movable contact spring 100. Because the suction force of the short-circuit resisting structure 6000 acting on the first movable reed 100 is zero or smaller, the breaking process of the first movable reed 100 does not need to resist the suction force of the short-circuit resisting structure 6000 or the suction force of the resistance is small, and the breaking of the whole relay is facilitated.

When a short-circuit current (for example, 20 kA) is applied, the first movable reed 100 and the second movable reed 200 form a parallel circuit, so that the first movable reed 100 and the second movable reed 200 each apply a current of 10 kA. Because the suction force of the short-circuit resisting structure 6000 acting on the first movable reed 100 is smaller than the suction force of the second movable reed 200, the first movable reed 100 will be sprung out by the electric repulsive force between the contacts in preference to the second movable reed 200, and thus the current in the first movable reed 100 will gradually change from 10kA to 0kA, and the current in the second movable reed 200 will gradually change from 10kA to 20kA. Because the current in the second movable reed 200 is gradually increased from 10kA to 20kA, the current increase has a gradual process, and the electric repulsive force between the contacts of the second movable reed 200 and the fixed contact leading-out terminal 2000 also has a gradual trend, so that the suction force of the short-circuit resisting structure 6000 acting on the second movable reed 200 can resist a certain electric repulsive force, the function of delaying disconnection is achieved, and the reaction time is strived for the short-circuit disconnection of the whole circuit.

Therefore, the relay provided by the embodiment of the application is beneficial to realizing limit breaking among contacts, and can realize delayed breaking of the contacts during short circuit, so that the working reliability of the relay is ensured, and the service life of a product is prolonged.

Referring back to fig. 3 and 4, the anti-shorting structure 6000 includes a first magnetic conductor 6100 and at least one second magnetic conductor 6200. The first magnetizer 6100 is arranged at one side of the movable reeds 3110 facing the fixed contact leading-out terminal 2000; in the contact closing direction, the first conductor 6100 at least partially overlaps each movable contact 3110. Except for the movable spring 3110 with smaller contact gaps, one side of the movable spring 3110, which faces away from the stationary contact leading-out end 2000, of the movable springs 3110 is fixedly connected with a second magnetizer 6200, and the first magnetizer 6100 is used for forming a magnetic conduction loop with at least one second magnetizer 6200.

When the number of movable reeds 3110 is two, the first movable reed 100 is not connected to the second magnetizer 6200, and one side of the second movable reed 200 facing away from the stationary contact extraction terminal 2000 is fixedly connected to the second magnetizer 6200.

When the first movable reed 100 and the second movable reed 200 are energized, the portion of the first movable reed 100 corresponding to the position of the first movable reed 100 of the first magnetic conductor 6100 is magnetized, thereby forming a suction force in the contact closing direction to the first movable reed 100; for the second movable reed 200, a magnetic circuit surrounding the second movable reed 200 is formed between the first magnetic conductor 6100 and the second magnetic conductor 6200 on both sides of the second movable reed 200. When a short-circuit current passes through the second movable reed 200, a suction force in the contact pressure direction is generated between the first conductor 6100 and the second conductor 6200, and the suction force can resist an electric repulsive force generated by the short-circuit current between the second movable reed 200 and the stationary contact lead 2000.

It should be noted that, since the first conductive body 6100 and the second conductive body 6200 are respectively located on the side of the movable reed 3110 facing the stationary contact lead-out terminal 2000 and the side facing away from the stationary contact lead-out terminal 2000, the attraction force between the first conductive body 6100 and the second conductive body 6200 is direct electromagnetic attraction force, so that the electric repulsive force generated by the short-circuit current between the second movable reed 200 and the stationary contact lead-out terminal 2000 can be more forcefully resisted. In other words, the suction force of the short circuit prevention structure 6000 acting on the first movable reed 100 is smaller than the suction force acting on the second movable reed 200. That is, the suction force on the movable reed 3110 whose contact gap is small is smaller than the suction force on the remaining movable reeds 3110.

It is understood that the first magnetic conductor 6100 and the second magnetic conductor 6200 may be in a linear shape or a U-shape, and the first magnetic conductor 6100 and the second magnetic conductor 6200 may be made of soft magnetic materials such as iron, cobalt, nickel, and alloys thereof.

Alternatively, for the first magnetic conductor 6100, it may include a plurality of stacked magnetic conductive sheets. It will be appreciated that by increasing the number of thinner magnetically permeable pieces, the overall thickness of the first conductor 6100 can be increased. On the one hand, the thickness of the magnetic conduction sheet is thinner, and the magnetic conduction sheet can be made of thin belt materials, so that the material cost is lower, and the operation is easy. On the other hand, the number of the magnetic conductive sheets can be flexibly adjusted according to the magnitude of the short-circuit current.

Of course, in other embodiments, in order to make the suction force on the first movable reed 100 smaller than the suction force on the second movable reed 200, the second magnetizer 6200 is connected to the side of the first movable reed 100 and the side of the second movable reed 200 facing away from the stationary contact outlet 2000, but the thickness of the second magnetizer 6200 connected to the first movable reed 100 needs to be smaller than the thickness of the second magnetizer 6200 connected to the second movable reed 200.

As shown in fig. 3 and 4, the first magnetic conductor 6100 is fixedly provided with respect to the contact vessel 1000. In this way, the suction force of the short circuit resistant structure 6000 is transferred to the contact container 1000, and since the contact container 1000 is a stationary part, excessive coil holding force is not needed, so that the power consumption of the coil of the relay and the volume of the relay are reduced, and the short circuit resistant capability is improved.

Further, the first magnetic conductor 6100 is connected to the ceramic cap 1110 of the insulating cap 1100 by the connection 300. The ceramic cover 1110 of the insulating cover 1100 is provided with a third through hole 1111; the connecting piece 300 is rod-shaped and penetrates through the third through hole 1111; one end of the connector 300 is connected to the insulating cover 1100, and the other end is connected to the first magnetic conductor 6100.

The manner in which the axial end of the connector 300 is coupled to the ceramic cap 1110 may have various embodiments, such as welding, riveting, screwing, bonding, etc. The other end of the connector 300 may be connected to the first conductive body 6100 by various methods, such as welding, riveting, screwing, bonding, clamping, etc.

It can be appreciated that when the connection mode between one end of the connector 300 and the ceramic cover 1110 is welding, by welding the connector 300 on the top wall of the ceramic cover 1110, the metalized layer can be processed only on the periphery of the third through hole 1111 on the outer wall surface of the top wall, and the metalized layer does not need to be processed on the inner wall surface of the top wall, so that the processing is convenient and the processing steps are simplified.

It is understood that one end of the connector 300 may be connected to the outer wall surface of the ceramic cap 1110, may be connected to the inner wall surface of the ceramic cap 1110, or may be connected to both the outer wall surface and the inner wall surface of the ceramic cap 1110.

As can be seen from this, the first magnetic conductor 6100 is connected to the ceramic cover 1110 by the connector 300, on the one hand, the short-circuit-resistant suction force is transferred to the ceramic cover 1110, so that excessive coil holding force is not needed, thereby reducing the power consumption of the coil of the relay and the volume of the relay, and improving the short-circuit-resistant capability; on the other hand, since the connector 300 is connected to the ceramic cap 1110, the space of the contact chamber is not excessively occupied, and the arc extinguishing space of the arc extinguishing assembly and the movable space of the push rod are ensured.

In addition, the first magnetizer 6100 is connected with the rod-shaped connector 300, so that a plurality of connection modes, such as riveting, laser welding, clamping, gluing, etc., can be adopted between the first magnetizer 6100 and the connector 300, thereby enriching the connection modes.

As an example, the connector 300 is a solid rod. In this way, the connecting piece 300 and the first magnetizer 6100 can be connected by riveting, so that the connection is more reliable. In addition, the solid rod has higher supporting strength and is less easy to deform.

Of course, the first magnetizer 6100 may be fixedly disposed in the contact vessel 1000: the first magnetic conductor 6100 is fixedly disposed within the contact vessel 1000 by a fixing bracket (not shown). Specifically, the fixing bracket is disposed in the contact container 1000 and is fixedly connected to the yoke plate 1200, and the first magnetizer 6100 is fixedly connected to the fixing bracket.

In addition, in yet another embodiment, the distance between the first conductor 6100 and the second conductor 6200 may be designed as a variable pitch. Specifically, the distance between the first magnetizer 6100 and the second magnetizer 6200 can be adjusted according to the magnitude of the current value, so as to change the magnitude of the magnetic attraction generated between the first magnetizer 6100 and the second magnetizer 6200, and meet the requirement of overload breaking while meeting the short circuit resistance.

In an embodiment, the resilient assembly 3300 may be a compression spring or a leaf spring. Also, the number of compression springs or leaf springs may be one or more. The number of the plurality of compression springs or the plurality of leaf springs may be the same as the number of the plurality of movable reeds.

The following is a schematic diagram of four different embodiments of the anti-shorting structure 6000 and the plurality of movable reeds 3110, respectively, shown in connection with fig. 9-12.

As shown in fig. 9, the number of movable reeds 3110 includes two, first movable reeds 100 and second movable reeds 200, respectively. The short circuit resisting structure 6000 comprises a first magnetizer 6100 which is in a straight shape, wherein the first magnetizer 6100 is only arranged at one side of the second movable contact spring 200 facing the fixed contact leading end 2000, and is not arranged at one side of the first movable contact spring 100 facing the fixed contact leading end 2000. Thus, the amount of suction on the first movable contact spring 100 can be regarded as zero.

As shown in fig. 10, the number of movable reeds 3110 includes two, first movable reeds 100 and second movable reeds 200, respectively. The short circuit resisting structure 6000 comprises a first magnetizer 6100 in a straight line shape and a second magnetizer 6200 in a U shape, wherein the first magnetizer 6100 is arranged at one side of the second movable contact spring 200 facing the fixed contact leading-out terminal 2000, and the second magnetizer 6200 is arranged at one side of the second movable contact spring 200 facing away from the fixed contact leading-out terminal 2000. Thus, the amount of suction on the first movable contact spring 100 can be regarded as zero.

As shown in fig. 11, the number of movable reeds 3110 includes two, first movable reeds 100 and second movable reeds 200, respectively. The anti-short circuit structure 6000 includes a first conductive body 6100 having a U-shape and a second conductive body 6200 having a straight shape. The first magnetizer 6100 is disposed at a side of the second movable contact spring 200 facing the stationary contact terminal 2000, and the second magnetizer 6200 is disposed at a side of the second movable contact spring 200 facing away from the stationary contact terminal 2000. Thus, the amount of suction on the first movable contact spring 100 can be regarded as zero.

As shown in fig. 12, the number of movable springs 3110 includes three. The anti-short circuit structure 6000 comprises two first magnetizers 6100 in a straight shape and two second magnetizers 6200 in a U shape, wherein the two first magnetizers 6100 are respectively arranged at one side of the two movable reeds 3110 facing the stationary contact leading-out end 2000, and the two second magnetizers 6200 are respectively arranged at one side of the two movable reeds 3110 facing away from the stationary contact leading-out end 2000. Thus, the amount of suction on the remaining one movable contact 3110 can be regarded as zero.

As shown in fig. 13 to 15, the sealing unit of the second embodiment has substantially the same structure in the basic configuration as the sealing unit of the first embodiment. Therefore, in the following description of the sealing unit of the second embodiment, the structure already described in the first embodiment is not repeated. The same reference numerals are given to the same configurations as those of the sealing unit described in the first embodiment. Therefore, in the following description of the present embodiment, mainly the differences from the sealing unit of the first embodiment will be described.

As shown in fig. 14 and 15, the short circuit resisting structure 6000 includes at least one first magnetic conductor 6100 and at least one second magnetic conductor 6200, the at least one first magnetic conductor 6100 being provided at a side of the plurality of movable reeds 3110 facing the stationary contact extraction terminal 2000; the number and positions of at least one first magnetic conductor 6100 respectively correspond to the number and positions of the remaining movable reeds 3110 in the contact closing direction; except for the movable reed 3110 with smaller contact gaps, one side of the movable reeds 3110, which faces away from the stationary contact leading end 2000, of the movable reeds 3110 is fixedly connected with a second magnetizer 6200, and the corresponding first magnetizer 6100 and second magnetizer 6200 are used for forming a magnetic conductive loop.

When the number of the movable reeds 3110 is two, the short-circuit resisting structure 6000 includes one first magnetizer 6100 and one second magnetizer 6200, and the first magnetizer 6100 is only provided on the side of the second movable reed 200 facing the stationary contact outlet 2000, and is not provided on the side of the first movable reed 100 facing the stationary contact outlet 2000. The second magnetizer 6200 is fixedly arranged on one side of the second movable reed 200, which is opposite to the fixed contact outlet 2000. Since the first movable reed 100 is not provided with the first magnetic conductor 6100 and the second magnetic conductor 6200, the suction force on the first movable reed 100 can be regarded as zero.

With continued reference to fig. 14 and 15, at least one first magnetic conductor 6100 is mounted to the push rod assembly 3200. Further, at least one first magnetic conductor 6100 is connected to a side surface of the top wall 3221 of the contact holder 3220 facing the push rod 3210.

The top wall 3221 includes a first segment 3221a, a second segment 3221b and a bending segment 3221c, the bending segment 3221c is connected to the first segment 3221a, and is connected to the second segment 3221b in a bending manner from the first segment 3221a in a direction away from the pushing rod 3210; one ends of the two side walls 3222 are connected to the first section 3221a and the second section 3221b, respectively. At least one first magnetic conductor 6100 is connected to a side surface of the second section 3221b facing the push rod 3210, and a side surface of the at least one first magnetic conductor 6100 facing the push rod 3210 is flush with a side surface of the first section 3221a facing the push rod 3210.

As a modified embodiment, the present application also provides a relay, which is different from the relay of the above embodiment in that:

The contact gaps between each movable contact 3110 and the stationary contact terminal 2000 are equal; the short circuit resistant structure 6000 is for forming suction force in a contact closing direction on the plurality of movable reeds 3110; wherein the suction force on at least one movable contact spring 3110 of the plurality of movable contact springs 3110 is smaller than the suction force on the remaining movable contact springs 3110.

Note that, the suction force on at least one movable reed 3110 is smaller than the suction force on each of the remaining movable reeds 3110 may include the following cases: the suction force on at least one movable contact spring 3110 is zero; or the suction force on each movable contact spring 3110 is greater than 0, and the suction force on at least one movable contact spring 3110 is smaller than the suction force on the remaining respective movable contact springs 3110.

For example, when the number of movable reeds 3110 is three or more, the suction force on one or two movable reeds 3110 may be zero, and the suction force on the other one or two movable reeds 3110 may be greater than 0; the suction force on each movable spring 3110 may be greater than 0, and the suction force on one movable spring 3110 may be smaller than the suction force on the other two movable springs 3110, and the suction forces on the other two movable springs 3110 may be equal or unequal; alternatively, the suction force on each movable contact spring 3110 is greater than 0, and the suction force on two movable contact springs 3110 is equal and smaller than the suction force on the other movable contact spring 3110.

As shown in fig. 9 to 11, for convenience of explanation, the number of movable reeds 3110 is taken as two, and two movable reeds 3110 are defined as a first movable reed 100 and a second movable reed 200, respectively, a contact gap between the first movable reed 100 and the stationary contact terminal 2000 is equal to a contact gap between the second movable reed 200 and the stationary contact terminal 2000, and a suction force on the first movable reed 100 is smaller than a suction force on the second movable reed 200.

Since the contact gap between the first movable contact spring 100 and the stationary contact terminal 2000 is equal to the contact gap between the second movable contact spring 200 and the stationary contact terminal 2000, the first movable contact spring 100 and the second movable contact spring 200 are simultaneously turned on in the closing process; during the breaking process, the first movable reed 100 and the second movable reed 200 are simultaneously broken.

When a limit breaking current (for example, 2 kA) is passed, the first movable reed 100 and the second movable reed 200 constitute a parallel circuit, so that the first movable reed 100 and the second movable reed 200 both pass a current of 1 kA. After the current is split, the current flowing through the first movable reed 100 and the second movable reed 200 becomes smaller, so that the suction force of the short-circuit resisting structure 6000 acting on the first movable reed 100 and the second movable reed 200 becomes smaller, and timely breaking is facilitated.

When a short-circuit current (for example, 20 kA) is applied, the first movable reed 100 and the second movable reed 200 form a parallel circuit, so that the first movable reed 100 and the second movable reed 200 each apply a current of 10 kA. Because the suction force on the first movable reed 100 is smaller than the suction force on the second movable reed 200, the first movable reed 100 will be sprung out by the electric repulsive force between the contacts in preference to the second movable reed 200, and thus the current in the first movable reed 100 will gradually change from 10kA to 0kA, and the current in the second movable reed 200 will gradually change from 10kA to 20kA. Because the current in the second movable reed 200 is gradually increased from 10kA to 20kA, the current increase has a gradual process, and the electric repulsive force between the contacts of the second movable reed 200 and the fixed contact leading-out terminal 2000 also has a gradual trend, so that the suction force of the short-circuit resisting structure 6000 acting on the second movable reed 200 can resist a certain electric repulsive force, the function of delaying disconnection is achieved, and the reaction time is strived for the short-circuit disconnection of the whole circuit.

Therefore, the relay provided by the embodiment of the application has the advantages that the relay is beneficial to realizing limit breaking among contacts, delay breaking of the contacts during short circuit can be realized, the working reliability of the relay is ensured, and the service life of a product is prolonged.

It will be appreciated that the various embodiments/implementations provided by the application may be combined with one another without conflict and are not illustrated here.

In the examples of the application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more, unless expressly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the examples of application will be understood by those of ordinary skill in the art as the case may be.

In the description of the application embodiments, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the application embodiments and simplifying the description, and do not indicate or imply that the devices or units to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the application embodiments.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an application embodiment. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the application embodiment, and is not intended to limit the application embodiment, and various modifications and changes may be made to the application embodiment by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the application should be included in the protection scope of the embodiments of the application.

Claims (19)

1. A relay, comprising:

A pair of stationary contact terminals;

the movable contact lead-out terminals are respectively connected with the movable contact lead-out terminals in a first direction; the first direction is the arrangement direction of the pair of stationary contact leading-out ends; the contact gap between at least one movable reed of the movable reeds and the fixed contact leading-out end is smaller than the contact gap between the rest movable reeds and the fixed contact leading-out end; and

The short-circuit resistant structure is used for forming suction force in the contact closing direction on the movable contact springs; the suction force on the movable reed with smaller contact clearance is smaller than the suction force on each other movable reed.

2. The relay of claim 1, wherein the anti-shorting structure comprises:

The first magnetizer is arranged on one side of the movable contact spring towards the leading-out end of the fixed contact; the first magnetizer is at least partially overlapped with each movable reed along the contact closing direction; and

The movable reed comprises at least one second magnetizer, one side, opposite to the stationary contact leading-out end, of the movable reeds except for the movable reed with smaller contact gaps is fixedly connected with the second magnetizer, and the first magnetizer is used for forming a magnetic conduction loop with the at least one second magnetizer.

3. The relay according to claim 2, further comprising a contact container provided with a pair of first through holes, a pair of stationary contact terminals penetrating through the pair of first through holes, respectively; the movable reeds are arranged in the contact container;

The first magnetizer is arranged in the contact container and is fixedly arranged relative to the contact container.

4. A relay according to claim 3, wherein the contact receptacle comprises:

a yoke plate; and

The insulating cover is covered on one side surface of the yoke plate and is provided with a pair of first through holes; the first magnetizer is connected to the insulating cover through a connecting piece.

5. The relay according to claim 4, wherein the insulating cover is provided with a third through hole;

the connecting piece is rod-shaped and penetrates through the third through hole; one end of the connecting piece is connected with the insulating cover, and the other end of the connecting piece is connected with the first magnetizer.

6. The relay according to claim 4, wherein the insulating cover includes a ceramic cover and a frame piece, the ceramic cover being connected to the yoke plate through the frame piece;

the ceramic cover is provided with a pair of first through holes; the first magnetizer is connected to the ceramic cover through the connecting piece.

7. The relay of claim 1, wherein the anti-shorting structure comprises:

At least one first magnetizer arranged at one side of the movable contact spring towards the leading-out end of the stationary contact; the number and the positions of at least one first magnetizer respectively correspond to the number and the positions of the rest movable reeds along the contact closing direction; and

And one side, opposite to the stationary contact leading-out end, of the movable spring leaves except for the movable spring leaves with smaller contact gaps is fixedly connected with one second magnetizer, and the corresponding first magnetizer and second magnetizer are used for forming a magnetic conduction loop.

8. The relay of claim 7, wherein the relay further comprises:

The movable spring plates are arranged on the pushing rod assembly through elastic assemblies, and the elastic assemblies are used for providing contact pressure for the movable spring plates;

A plurality of the first magnetizers are mounted on the push rod assembly.

9. The relay according to claim 8, wherein the moving direction of the movable reed is defined as a second direction; the push rod assembly includes:

a push rod;

The contact support comprises a top wall and two side walls, one ends of the two side walls are respectively connected to two sides of the top wall along a third direction, and the other ends of the two side walls are respectively connected with the pushing rod; the first direction, the second direction and the third direction are perpendicular to each other;

Wherein a plurality of the first magnetizers are connected to the top wall.

10. The relay of claim 9, wherein the top wall includes a first section, a second section, and a bent section connected to the first section and bent from the first section to the second section in a direction away from the push rod; one ends of the two side walls are respectively connected with the first section and the second section;

At least one first magnetizer is connected to one side surface of the second section, which faces the pushing rod, and the one side surface of the first magnetizer, which faces the pushing rod, is flush with one side surface of the first section, which faces the pushing rod.

11. The relay according to claim 1, wherein the suction force on the movable reed with a small contact gap is zero.

12. The relay of claim 11, wherein the anti-shorting structure comprises:

And one side of the movable reed, which faces the stationary contact leading end, is provided with one first magnetizer except for the movable reed with smaller contact gaps.

13. The relay according to claim 1, wherein a plurality of the movable reeds are arranged side by side in a third direction;

The moving direction of the movable reed is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.

14. A relay, comprising:

A pair of stationary contact terminals;

The movable contact lead-out terminals are respectively connected with the movable contact lead-out terminals in a first direction; the first direction is the arrangement direction of the pair of stationary contact leading-out ends; the contact gaps between the movable reeds and the fixed contact leading-out ends are equal; and

The short-circuit resistant structure is used for forming suction force in the contact closing direction on the movable contact springs; wherein the suction force on at least one movable reed of the plurality of movable reeds is smaller than the suction force on the rest movable reeds.

15. The relay of claim 14, wherein the anti-shorting structure comprises:

The first magnetizer is arranged on one side of the movable contact spring towards the leading-out end of the fixed contact; the first magnetizer is at least partially overlapped with each movable reed along the contact closing direction; and

The movable contact comprises at least one second magnetizer, one side, opposite to the leading-out end of the fixed contact, of the movable contact except for the movable contact with smaller suction force, of the movable contact is fixedly connected with the second magnetizer, and the first magnetizer is used for forming a magnetic conduction loop with the at least one second magnetizer.

16. The relay of claim 14, wherein the anti-shorting structure comprises:

At least one first magnetizer arranged at one side of the movable contact spring towards the leading-out end of the stationary contact; the number and the positions of at least one first magnetizer respectively correspond to the number and the positions of the rest movable reeds along the contact closing direction; and

The movable reed comprises at least one second magnetizer, wherein the movable reeds with smaller suction force are arranged in the movable reeds, one side of the rest movable reeds, which is opposite to the leading-out end of the fixed contact, is fixedly connected with one second magnetizer, and the corresponding first magnetizer and second magnetizer are used for forming a magnetic conduction loop.

17. The relay of claim 14, wherein the suction force on one of the movable springs is zero.

18. The relay of claim 17, wherein the anti-shorting structure comprises:

And one side of the movable reed, which faces the leading end of the fixed contact, is provided with one first magnetizer except for the movable reed with smaller suction force.

19. The relay according to claim 14, wherein a plurality of the movable reeds are arranged side by side in a third direction;

The moving direction of the movable reed is defined as a second direction, and the first direction, the second direction and the third direction are perpendicular to each other.