WO2024078455A1

WO2024078455A1 - Relay

Info

Publication number: WO2024078455A1
Application number: PCT/CN2023/123595
Authority: WO
Inventors: 王萌; 陈松生; 洪尧生; 代文广
Original assignee: 厦门宏发电力电器有限公司
Priority date: 2022-10-12
Filing date: 2023-10-09
Publication date: 2024-04-18
Also published as: CN117912898A

Abstract

A relay, which comprises: a contact housing (10), a pair of static contact lead-out terminals (20), a holding component (42), a first magnetic conductor (40), and a movable component (53). The contact housing has a contact chamber (101); and the pair of static contact lead-out terminals are connected to the contact housing. At least part of the holding component is arranged in the contact chamber and is fixedly arranged relative to the contact housing; the first magnetic conductor is movably connected between a first position (P1) and a second position (P2) to the holding component; the movable component comprises a moving reed (54) and a second magnetic conductor (55), the first magnetic conductor is disposed on the side of the moving reed facing the static contact lead-out terminals, and the second magnetic conductor is fixedly connected to the side of the moving reed facing away from the static contact lead-out terminals; in the first position, the distance between the first magnetic conductor and the second magnetic conductor is a first distance, and in the second position, the distance between the first magnetic conductor and the second magnetic conductor is a second distance, the first distance being greater than the second distance.

Description

Relay

This disclosure claims priority to Chinese patent application No. 202211249341.3 filed on October 12, 2022, the entire contents of which are incorporated herein by reference in their entirety.

Technical Field

The present disclosure relates to the technical field of relays, and in particular to a high-voltage direct current relay.

Background technique

A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is usually used in automatic control circuits. A relay is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic regulation, safety protection, and circuit conversion in the circuit.

High-voltage DC relay is a type of relay. In order to solve the problem of contacts of high-voltage DC relays being ejected due to the electromotive repulsion generated by short-circuit current, an anti-short-circuit ring electromagnetic structure is usually set in the relevant technology. It is further divided into a follower structure and a fixed structure according to the position of the upper yoke. Specifically, the follower structure refers to the upper yoke being set on the movable component of the relay, and the fixed structure refers to the upper yoke being set on the fixed component other than the movable component. However, although the anti-short-circuit capability of the fixed anti-short-circuit structure is greatly enhanced, the short-circuit capability and the breaking capability are negatively correlated, resulting in a weakened breaking capability. However, the follower anti-short-circuit structure is affected by the holding force of the moving iron core. When the short-circuit current is large, the iron core will be disengaged, causing the contacts to be disconnected. To increase the holding force of the moving iron core, the coil needs to be increased, which is inconsistent with the design of small volume and light weight.

Summary of the invention

The present disclosure provides a relay to take into account both short-circuit resistance and ultimate breaking capacity.

The relay disclosed in the present invention comprises a contact container, a pair of static contact lead-out terminals, a holding member, a first magnetic conductor and a movable member, wherein the contact container has a contact chamber; a pair of static contact lead-out terminals are connected to the contact container; at least part of the static contact lead-out terminals are located in the contact chamber; at least part of the holding member is arranged in the contact chamber and is fixedly arranged relative to the contact container; the first magnetic conductor is movably connected to the holding member between a first position and a second position; the movable member comprises a moving reed and a second magnetic conductor, the two ends of the moving reed are used to contact or separate with the pair of static contact lead-out terminals; the first magnetic conductor is arranged on a side of the moving reed facing the static contact lead-out terminals, the second magnetic conductor is fixedly connected to a side of the moving reed facing away from the static contact lead-out terminals, and the second magnetic conductor is used to contact or separate with the moving reed. The first magnetic conductor forms a magnetic circuit; in the first position, the distance between the first magnetic conductor and the second magnetic conductor is a first spacing, and in the second position, the distance between the first magnetic conductor and the second magnetic conductor is a second spacing, and the first spacing is greater than the second spacing.

According to some embodiments of the present disclosure, the first magnetic conductor is located at the first position, and the current value flowing through the movable reed is less than or equal to a threshold current;

When the current value flowing through the movable reed is greater than the threshold current, the first magnetic conductor moves from the first position to the second position.

According to some embodiments of the present disclosure, the first magnetic conductor is movably connected to the retaining member via a limiting structure, and the limiting structure is used to limit the movement of the first magnetic conductor relative to the retaining member between the first position and the second position.

According to some embodiments of the present disclosure, the limiting structure includes:

a limiting groove, provided on one of the first magnetic conductor and the retaining member, the limiting groove extending along the moving direction of the movable spring; a groove wall of the limiting groove having a stop wall at one end close to the second magnetic conductor; and

A limit block is arranged on the other of the first magnetic conductor and the retaining member, the limit block is slidably matched with the limit groove, and in the second position, the stop wall stops at the limit block.

According to some embodiments of the present disclosure, at the first position, there is a first gap between the limiting block and the groove wall of the limiting groove;

In the second position, a second gap is provided between the limiting block and the groove wall of the limiting groove;

The first gap is smaller than the second gap.

According to some embodiments of the present disclosure, the contact container further has a pair of first through holes and a second through hole, wherein the first through hole and the second through hole are both connected to the contact chamber; a pair of static contact lead-out terminals are respectively provided through the pair of first through holes;

The relay further includes a connecting member, which is passed through the second through hole and includes a first end and a second end, wherein the first end is connected to the contact container, and the second end is connected to the retaining member.

According to some embodiments of the present disclosure, the contact container comprises:

yoke iron plate; and

An insulating cover connected to the yoke plate; the insulating cover and the yoke plate enclose the contact chamber;

The first through hole and the second through hole are formed in the insulating cover, and the first end of the connecting member is connected to the outer wall surface of the insulating cover.

According to some embodiments of the present disclosure, the insulating cover includes a ceramic cover and a frame, wherein the ceramic cover includes a top wall and a A side wall, one end of which is connected to the periphery of the top wall, and the other end of which is connected to the yoke plate through the frame sheet;

The first through hole and the second through hole are opened in the top wall; in the outer wall surface of the top wall, a first metallization layer is provided at the periphery of the first through hole, and a second metallization layer is provided at the periphery of the second through hole;

The static contact lead-out terminal is welded to the top wall through the first metallization layer, and the first end of the connector is welded to the top wall through the second metallization layer.

According to some embodiments of the present disclosure, the top wall and the side wall are separate structures, or the top wall and the side wall are an integral structure.

According to some embodiments of the present disclosure, the retaining member is spaced apart from the inner wall surface of the top wall.

yoke iron plate; and

The relay further includes a fixing frame, which is disposed in the contact chamber and fixedly connected to the yoke plate, and the retaining member is fixedly connected to the fixing frame.

According to some embodiments of the present disclosure, the relay further includes:

The first elastic member is disposed between the first magnetic conductor and the retaining member, and is used for applying an elastic force to the first magnetic conductor to move toward the first position.

According to some embodiments of the present disclosure, the retaining member comprises:

A first bracket, fixedly arranged relative to the contact container;

The second bracket is detachably connected to the first bracket and forms a retaining cavity together with the first bracket; the first elastic member and the first magnetic conductor are located in the retaining cavity, and a receiving groove is provided on the side of the first magnetic conductor facing the second bracket, one end of the first elastic member abuts against the second bracket, and the other end abuts against the bottom of the receiving groove.

According to some embodiments of the present disclosure, the first elastic member is a spring.

According to some embodiments of the present disclosure, the relay further includes a push rod assembly, and the push rod assembly includes:

A rod portion, movable relative to the contact container along an axial direction of the rod portion;

a base, which is arranged at one end of the rod portion along the axial direction and at least partially extends into the contact chamber; the movable member is movably connected to the base along the axial direction of the rod portion; and

The second elastic member is connected to the movable component and the base, and is used for applying an elastic force to the movable component to move toward the first magnetic conductor.

According to some embodiments of the present disclosure, the retaining member is located between a pair of the stationary contact lead terminals.

According to some embodiments of the present disclosure, the retaining member is made of a metal material.

According to some embodiments of the present disclosure, in the second position, the second distance between the first magnetic conductor and the second magnetic conductor is equal to zero.

One embodiment disclosed above has at least the following advantages or beneficial effects:

In the relay disclosed in the present invention, on the one hand, the first magnetic conductor is arranged on a retaining member fixed relative to the contact container, so that the retaining force of the first magnetic conductor is provided by the contact container, which can effectively improve the upper limit of the short-circuit current carrying capacity and ensure the reliability of short-circuit resistance. On the other hand, the first magnetic conductor is movably connected to the retaining member, so that the distance between the first magnetic conductor and the second magnetic conductor can be adjusted according to the magnitude of the current value, thereby changing the magnitude of the magnetic attraction force generated between the first magnetic conductor and the second magnetic conductor, while meeting the requirements of short-circuit resistance, it can also meet the requirements of overload disconnection.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a three-dimensional schematic diagram of a relay of the present disclosure, in which a housing, an electromagnet unit and an arc extinguishing unit are omitted.

FIG. 2 is a schematic top view of FIG. 1 .

FIG3 shows a cross-sectional view taken along line M-M in FIG1 .

FIG. 4 is a three-dimensional schematic diagram showing FIG. 1 with the ceramic cover and the frame piece omitted.

FIG. 5 is an exploded schematic diagram of FIG. 1 .

FIG6 shows a cross-sectional view taken along line N-N in FIG1 , wherein the ceramic cover and the frame are omitted, and the first magnetic conductor is in the first position.

FIG. 7 shows a partial enlarged view of the X in FIG. 6 .

FIG8 is a cross-sectional view taken along line N-N in FIG1 , wherein the ceramic cover and the frame are omitted, and the first magnetic conductor is in the second position.

FIG. 9 shows a partial enlarged view of the Y portion in FIG. 8 .

FIG. 10 shows a partial enlarged view of point P in FIG. 4 .

FIG. 11 is a schematic diagram showing a retaining member fixedly connected to a fixing frame.

FIG. 12 is an exploded schematic diagram of a relay according to the present disclosure.

FIG. 13 is an exploded schematic diagram showing the first bracket, the second bracket and the first magnetic conductor.

The reference numerals are described as follows:

10. contact container; 101. contact chamber; 102. first through hole; 103. second through hole; 11a. insulating cover; 11. ceramic cover; 111. top wall; 112. side wall; 113. first metallization layer; 114. second metallization layer; 12. frame; 13. yoke iron plate; 131. third through hole; 20. static contact lead-out terminal; 30. connector; 31. first end of connector; 32. second end of connector; 40. first magnetic conductor; 401. guide groove; 41. receiving groove; 42. holding member; 421. first bracket; 422. second bracket; 423. holding cavity; 424. hook; 425. clamping hole; 426. guide portion; 43. limiting structure; 431. limiting groove; 432. limiting block; 433. stop wall; 434. limiting wall; 435. groove wall ;44, first elastic member;50, push rod assembly;51, rod;52, base;53, movable member;54, moving spring;55, second magnetic conductor;56, second elastic member;57, sliding structure;571, limit portion;572, limit hole;70, fixing frame;1100, shell;1110, first shell;1120, second shell;1130, exposure hole;1200, electromagnet unit;1210, coil frame;1220, coil;1240, moving iron core;1250, reset member;1300, arc extinguishing unit;1310, arc extinguishing magnet;1320, yoke iron clamp;1400, sealing unit;1410, metal cover;P1, first position;P2, second position;H1, first spacing;H2, second spacing;D1, movement direction;D2, length direction.

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of 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 comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

As shown in FIG. 12 , FIG. 12 shows an exploded schematic diagram of the relay of the present disclosure. The relay includes a housing 1100, an electromagnet unit 1200, an arc extinguishing unit 1300, and a sealing unit 1400. The sealing unit 1400 is disposed in the housing 1100, and the top of the static contact lead-out end of the sealing unit 1400 is exposed to the outer surface of the housing 1100 through the exposure hole 1130 of the housing 1100. The electromagnet unit 1200 and the arc extinguishing unit 1300 are both disposed in the housing 1100.

As an example, the housing 1100 includes a first shell 1110 and a second shell 1120 , which are snap-connected to form a chamber for accommodating the electromagnet unit 1200 , the arc extinguishing unit 1300 , and the sealing unit 1400 .

The arc extinguishing unit 1300 is used to extinguish the arc generated between the static contact lead-out terminal of the sealing unit 1400 and the moving reed.

As an example, the arc extinguishing unit 1300 includes two arc extinguishing magnets 1310. The arc extinguishing magnets 1310 may be permanent magnets, and each arc extinguishing magnet 1310 may be substantially in the shape of a rectangular parallelepiped. The two arc extinguishing magnets 1310 are respectively disposed in the sealing unit On both sides of 1400, and are arranged opposite to each other along the length direction D2 of the moving spring.

By providing two arc extinguishing magnets 1310 disposed opposite to each other, a magnetic field can be formed around the static contact lead-out terminal and the movable reed piece. Therefore, the arc generated between the static contact lead-out terminal and the movable reed piece will be elongated in a direction away from each other by the action of the magnetic field, thereby achieving arc extinguishing.

The arc extinguishing unit 1300 also includes two yoke iron clips 1320, and the two yoke iron clips 1320 are arranged corresponding to the positions of the two arc extinguishing magnets 1310. In addition, the two yoke iron clips 1320 surround the sealing unit 1400 and the two arc extinguishing magnets 1310. By designing that the yoke iron clips 1320 surround the arc extinguishing magnets 1310, it is possible to prevent the magnetic field generated by the arc extinguishing magnets 1310 from spreading outward and affecting the arc extinguishing effect. The yoke iron clips 1320 are made of soft magnetic materials. Soft magnetic materials may include but are not limited to iron, cobalt, nickel, and alloys thereof.

As shown in Figures 1 to 5, Figure 1 shows a three-dimensional schematic diagram of the relay disclosed in the present invention, in which the housing, the electromagnet unit and the arc extinguishing unit are omitted. Figure 2 shows a top view of Figure 1. Figure 3 shows a cross-sectional view of M-M in Figure 1. Figure 4 shows a three-dimensional schematic diagram of Figure 1 in which the ceramic cover 11 and the frame sheet 12 are omitted. Figure 5 shows an exploded schematic diagram of Figure 1.

The sealing unit 1400 of the present disclosure includes a contact container 10 , a pair of stationary contact lead-out terminals 20 , a push rod assembly 50 , a holding member 42 , a first magnetic conductor 40 , and a first elastic member 44 .

It is understood that the terms "including" and "having" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or components that are inherent to these processes, methods, products, or devices.

The contact container 10 has a contact chamber 101 therein. The contact container 10 may include an insulating cover 11 a and a yoke plate 13 . The insulating cover 11 a is disposed on one side of the yoke plate 13 . The insulating cover 11 a and the yoke plate 13 together enclose the contact chamber 101 .

The insulating cover 11a includes a ceramic cover 11 and a frame piece 12. The ceramic cover 11 is connected to the yoke iron plate 13 through the frame piece 12. The frame piece 12 can be a metal piece with an annular structure, such as an iron-nickel alloy, and one end of the frame piece 12 is connected to the opening edge of the ceramic cover 11, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece 12 is connected to the yoke iron plate 13, also by laser welding, brazing, resistance welding, gluing, etc. A frame piece 12 is arranged between the ceramic cover 11 and the yoke iron plate 13, which can facilitate the connection between the ceramic cover 11 and the yoke iron plate 13.

The ceramic cover 11 includes a top wall 111 and a side wall 112 . One end of the side wall 112 is connected to the periphery of the top wall 111 , and the other end of the side wall 112 is connected to the yoke plate 13 through the frame sheet 12 .

The contact container 10 also has a pair of first through holes 102 and a second through hole 103, both of which are connected to the contact chamber 101. The first through hole 102 is used for the static contact lead-out terminal 20 to pass through, and the second through hole 103 is used for a connecting member 30 to pass through.

As an example, the first through hole 102 and the second through hole 103 are both opened in the top wall 111 of the ceramic cover 11. The second through hole 103 can be arranged between the two first through holes 102, that is, the connecting member 30 is arranged between a pair of static contact lead-out terminals 20.

A pair of static contact lead-out terminals 20 are connected to the contact container 10, and at least a portion of each static contact lead-out terminal 20 is located in the contact chamber 101. One of the pair of static contact lead-out terminals 20 serves as a terminal for current inflow, and the other serves as a terminal for current outflow.

A pair of static contact lead-out terminals 20 are disposed in a pair of first through holes 102 in a one-to-one correspondence, and are connected to the top wall 111 of the ceramic cover 11 , for example, by welding.

The bottom of the static contact lead-out terminal 20 serves as a static contact, and the static contact may be integrally or separately arranged at the bottom of the static contact lead-out terminal 20 .

At least a portion of the retaining member 42 is disposed in the contact chamber 101 and is fixed relative to the contact container 10 for connecting to the first magnetic conductor 40 .

In one embodiment, the holding member 42 is located between a pair of static contact lead-out terminals 20. Thus, by arranging the holding member 42 between the pair of static contact lead-out terminals 20, it is possible to avoid the holding member 42 from occupying too much space in the contact chamber 101, which is conducive to miniaturization of the relay.

In one embodiment, the holding member 42 is made of a metal material to improve the structural strength of the holding member 42 .

As shown in Figures 5 and 13, Figure 13 shows an exploded schematic diagram of the first bracket, the second bracket and the first magnetic conductor. As an example, the holding member 42 may include a first bracket 421 and a second bracket 422. The first bracket 421 is fixedly arranged relative to the contact container 10, and the second bracket 422 is detachably connected to the first bracket 421, and encloses a holding cavity 423 with the first bracket 421, and the holding cavity 423 is used to accommodate the first magnetic conductor 40 and the first elastic member 44.

It can be understood that the first bracket 421 and the second bracket 422 are detachably connected and enclose a retaining cavity 423 for accommodating the first magnetic conductor 40 and the first elastic member 44, which facilitates the fixed installation of the retaining member 42 relative to the contact container 10 and the installation of the first magnetic conductor 40 and the first elastic member 44 into the retaining cavity 423.

As an example, the first bracket 421 and the second bracket 422 can be connected by the hook 424 and the hole 425, but the present invention is not limited thereto. For example, the hook 424 can be provided on one of the first bracket 421 and the second bracket 422, and the hole 425 can be provided on the other of the first bracket 421 and the second bracket 422.

The first magnetic conductor 40 is disposed in the contact chamber 101 and is movably connected to the holding member 42 between a first position P1 and a second position P2 .

Please continue to refer to FIG. 13 . A guide structure is provided between the first magnetic conductor 40 and the holding member 42. The guide structure is used to guide the first magnetic conductor 40 to move between the first position P1 and the second position P2 relative to the holding member 42 to avoid the first magnetic conductor 40 The magnetizer 40 vibrates.

As an example, the guide structure includes a guide portion 426 and a guide groove 401, wherein the guide portion 426 can be disposed in the guide groove 401 and can slidably cooperate with the guide groove 401. The guide portion 426 can be disposed on one of the first magnetizer 40 and the retaining member 42, and the guide groove 401 can be disposed on the other of the first magnetizer 40 and the retaining member 42.

In this embodiment, the guide portion 426 is disposed on the first bracket 421 , and the guide groove 401 is disposed on the first magnetic conductor 40 .

Of course, in other embodiments, the guide portion 426 may also be disposed on the first magnetic conductor 40 , while the guide groove 401 is disposed on the first bracket 421 .

The push rod assembly 50 is movably connected to the contact container 10 along the axial direction of the rod (ie, along the moving direction D1 of the movable reed). The push rod assembly 50 may include a rod portion 51, a base 52, a movable member 53 and a second elastic member 56.

The yoke plate 13 has a third through hole 131, which penetrates two opposite sides of the yoke plate 13 along the thickness direction of the yoke plate 13, and the third through hole 131 is connected to the contact chamber 101 of the contact container 10. The rod portion 51 is movably arranged in the axial direction through the third through hole 131. A base 52 is provided at one axial end of the rod portion 51, and at least a portion of the base 52 is located in the contact chamber 101.

The movable member 53 is movably connected to the base 52 along the axial direction of the rod 51. The movable member 53 includes a movable spring 54 and a second magnetic conductor 55, and the two ends of the movable spring 54 are used to contact or separate with a pair of static contact lead-out terminals 20. The first magnetic conductor 40 is arranged on the side of the movable spring 54 facing the static contact lead-out terminals 20, and the second magnetic conductor 55 is fixedly connected to the side of the movable spring 54 facing away from the static contact lead-out terminals 20. That is, along the axial direction of the rod 51, the movable spring 54 is located between the first magnetic conductor 40 and the second magnetic conductor 55.

As an example, the second magnetic conductor 55 and the movable spring 54 may be fixedly connected by rivets, but the present invention is not limited thereto.

It is understandable that the first magnetic conductor 40 and the second magnetic conductor 55 can be made of materials such as iron, cobalt, nickel, and alloys thereof.

In one embodiment, the first magnetic conductor 40 may be in a straight line shape, and the second magnetic conductor 55 may be in a U shape, but the present invention is not limited thereto. It is understood that both the first magnetic conductor 40 and the second magnetic conductor 55 may include multiple stacked magnetic conductors.

The two ends of the moving spring 54 are used to contact the bottom of a pair of static contact lead-out terminals 20 to achieve contact closure. The two ends of the moving spring 54 along its length direction D2 can serve as moving contacts. The moving contacts at the two ends of the moving spring 54 can protrude from other parts of the moving spring 54, or can be flush with other parts.

It can be understood that the moving contact can be integrally or separately provided at both ends of the moving reed piece 54 along the length direction D2 thereof.

The second elastic member 56 is connected to the movable member 53 and the base 52 , and is used to apply an elastic force to the movable member 53 to move toward the static contact lead-out terminal 20 /the first magnetic conductor 40 .

As an example, one end of the second elastic member 56 abuts against the base 52, and the other end abuts against the second magnetic conductor 55 of the movable member 53. Of course, in other embodiments, the second magnetic conductor 55 may be provided with a through hole, and the other end of the second elastic member 56 passes through the through hole of the second magnetic conductor 55 and abuts against the movable reed 54.

The first elastic member 44 and the first magnetic conductor 40 may both be located in the holding cavity 423 . The first elastic member 44 may be disposed between the first magnetic conductor 40 and the holding member 42 to apply an elastic force to the first magnetic conductor 40 to move toward the first position P1 .

A receiving groove 41 is formed on one side of the first magnetic conductor 40 facing the second bracket 422 . One end of the first elastic member 44 abuts against the second bracket 422 , and the other end abuts against the bottom of the receiving groove 41 .

It can be understood that the first elastic member 44 and the second elastic member 56 can both be springs, but the present invention is not limited thereto.

As shown in FIG5 , the push rod assembly 50 further includes a sliding structure 57, which is connected to the base 52 and the movable member 53, and the movable member 53 can slide relative to the base 52 through the sliding structure 57. The sliding structure 57 includes a matching limiting hole 572 and a limiting portion 571. The limiting portion 571 can slidably extend into the limiting hole 572.

In this embodiment, the base 52 is directly connected to the movable member 53 through the limiting structure 57, so that the assembly between the base 52 and the movable member 53 is simpler. In addition, since there are no other components above the movable member 53, the other components are prevented from interfering with the first magnetic conductor 40 during the overtravel process.

It can be understood that the limiting hole 572 can be a through hole or a blind hole.

As an example, a limiting hole 572 is provided on the base 52 , and a limiting portion 571 is provided on the movable member 53 . Further, a limiting portion 571 is provided on the second magnetic conductor 55 .

Of course, in other embodiments, the push rod assembly 50 may also be other structures in the prior art, which are not listed here one by one.

Please continue to refer to Figures 3, 5 and 12, the sealing unit 1400 also includes a metal cover 1410, which is connected to the side of the yoke plate 13 facing away from the insulating cover 11a, and the metal cover 1410 covers the third through hole 131 on the yoke plate 13. The metal cover 1410 and the yoke plate 13 enclose a chamber for accommodating the static iron core 1230 and the moving iron core 1240 of the electromagnet unit 1200, which will be described in detail below.

The electromagnet unit 1200 includes a coil frame 1210, a coil 1220, a static iron core 1230, a moving iron core 1240 and a reset member 1250. The coil frame 1210 is in the shape of a hollow cylinder and is formed of an insulating material. The metal cover 1410 is inserted into the coil frame 1210. The coil 1220 surrounds the coil frame 1210. The static iron core 1230 is fixedly arranged in the metal cover 1410, and part of the static iron core 1230 extends into the third through hole 131. The static iron core 1230 has a through hole, which is arranged corresponding to the position of the third through hole 131 for the rod portion 51 to pass therethrough. The moving iron core 1240 is movably arranged in the metal cover 1410 and is arranged opposite to the static iron core 1230. The moving iron core 1240 is connected to the rod portion 51 and is used to be attracted by the static iron core 1230 when the coil 1220 is energized. Moving The iron core 1240 and the rod portion 51 may be connected by screwing, riveting, welding or other methods.

The reset member 1250 is located inside the metal cover 1410 and is disposed between the static iron core 1230 and the moving iron core 1240 , and is used to reset the moving iron core 1240 when the coil 1220 is powered off. The reset member 1250 can be a spring, and is sleeved on the outside of the rod 51 .

It should be noted that when the coil 1220 is energized, the moving iron core 1240 can drive the push rod assembly 50 to move upward through the rod portion 51. When the movable member 53 contacts the static contact lead-out terminal 20, the movable member 53 is stopped by the static contact lead-out terminal 20, while the rod portion 51 and the base 52 will continue to move upward until the overtravel is completed.

As shown in Figures 6 and 9, Figure 6 shows a cross-sectional view of N-N in Figure 2, wherein the ceramic cover and the frame are omitted, and the first magnetizer 40 is in the first position P1. Figure 7 shows a partial enlarged view at X in Figure 6. Figure 8 shows a cross-sectional view of N-N in Figure 2, wherein the ceramic cover and the frame are omitted, and the first magnetizer 40 is in the second position P2. Figure 9 shows a partial enlarged view at Y in Figure 8. In the first position P1, the distance between the first magnetizer 40 and the second magnetizer 55 is the first spacing H1. In the second position P2, the distance between the first magnetizer 40 and the second magnetizer 55 is the second spacing H2, and the first spacing H1 is greater than the second spacing H2.

It should be noted that the movable spring 54 of the present invention is arranged between the first magnet 40 and the second magnet 55. When the two ends of the movable spring 54 are in contact with a pair of static contact lead-out terminals 20, a magnetic circuit surrounding the movable spring 54 is formed between the first magnet 40 and the second magnet 55, thereby generating a magnetic attraction force along the contact pressure direction between the first magnet 40 and the second magnet 55. The magnetic attraction force can resist the electric repulsion force generated by the short-circuit current between the movable spring 54 and the static contact lead-out terminals 20, thereby ensuring that the movable spring 54 and the static contact lead-out terminals 20 do not bounce apart.

It can be understood that when the current value flowing through the movable spring 54 is constant, the magnitude of the magnetic attraction generated between the first magnet 40 and the second magnet 55 is inversely proportional to the distance between the first magnet 40 and the second magnet 55. The smaller the distance, the greater the magnetic attraction generated.

In order to resist the electromotive repulsion generated by the short-circuit current and prevent the movable spring 54 from bouncing away from the static contact lead-out terminal 20, the distance between the first magnet 40 and the second magnet 55 should be designed to be smaller, so as to increase the magnetic attraction between the first magnet 40 and the second magnet 55.

In order to facilitate timely disconnection, the distance between the first magnetic conductor 40 and the second magnetic conductor 55 should be designed to be larger, so as to reduce the magnetic attraction between the first magnetic conductor 40 and the second magnetic conductor 55, so as to avoid excessive magnetic attraction that affects timely disconnection.

It can be seen from this that when the distance between the first magnetic conductor 40 and the second magnetic conductor 55 is a certain value, it is impossible to take into account both the short-circuit resistance and the ultimate breaking capacity.

In this embodiment, the first magnetic conductor 40 is arranged to be movable, so that the current value can be adjusted according to the current value. The distance between the first magnetic conductor 40 and the second magnetic conductor 55 is adjusted, thereby changing the magnitude of the magnetic attraction force generated between the first magnetic conductor 40 and the second magnetic conductor 55, so as to take into account both the short-circuit current resistance and the limit disconnection.

Specifically, as shown in Figures 6 and 7, the relay is in a normal working state, and the current value flowing through the movable reed 54 is less than or equal to a threshold current, for example, the current value is less than or equal to 2000A. Since the current value is small at this time, the magnetic attraction between the first magnet 40 and the second magnet 55 is also small, and the magnetic attraction is less than the elastic preload of the first elastic member 44 at this time. In this way, the elastic force of the first elastic member 44 can offset the magnetic attraction between the first magnet 40 and the second magnet 55, and keep the first magnet 40 in the first position P1. When the first magnet 40 is located at the first position P1, the distance between the first magnet 40 and the second magnet 55 is the first spacing H1. For example, the first spacing H1 can be 1.5 mm, but is not limited to this.

It is understandable that the magnitude of 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 can also be set larger, so as to ensure that under the normal working state of the relay, the first magnetic conductor 40 will still remain in the first position P1 and will not move to the second position P2.

As shown in FIG8 and FIG9, when the current value flowing through the movable spring 54 is greater than the threshold current, for example, the current is greater than 2000A, since the magnetic attraction between the first magnet 40 and the second magnet 55 is proportional to the current value, the greater the current value, the greater the magnetic attraction between the first magnet 40 and the second magnet 55. When the magnetic attraction is greater than the elastic preload of the first elastic member 44, the first magnet 40 will be attracted by the magnetic attraction and move toward the second magnet 55, so that the distance between the first magnet 40 and the second magnet 55 becomes smaller. Since the size of the magnetic spacing is inversely proportional to the size of the magnetic attraction, that is, the smaller the magnetic spacing, the greater the magnetic attraction. When a short-circuit current (much greater than the threshold current) flows, a greater magnetic attraction is generated between the first magnet 40 and the second magnet 55, which can compress the first elastic member 44 and move the first magnet 40 to the second position P2, at which time the distance between the first magnet 40 and the second magnet 55 is the second spacing H2. The second spacing H2 is smaller than the first spacing H1, and the smaller spacing increases the magnetic attraction between the first magnet 40 and the second magnet 55. Therefore, the first magnet 40 can attract the second magnet 55 through the larger magnetic attraction, and the magnetic attraction can resist the electromotive force generated by the short-circuit current, ensuring that the moving spring 54 does not bounce off the static contact lead-out terminal 20.

It can be seen that, in the relay disclosed in the present invention, on the one hand, the first magnetizer 40 is arranged on a retaining member 42 fixed relative to the contact container 10, so that the retaining force of the first magnetizer 40 is provided by the contact container 10, which can effectively improve the upper limit of the short-circuit current carrying capacity and ensure the reliability of short-circuit resistance. On the other hand, the first magnetizer 40 is movably connected to the retaining member 42, so that the distance between the first magnetizer 40 and the second magnetizer 55 can be adjusted according to the magnitude of the current value, thereby changing the magnitude of the magnetic attraction generated between the first magnetizer 40 and the second magnetizer 55, while meeting the requirements of short-circuit resistance, it can also meet the requirements of overload disconnection.

It is worth mentioning that when the first magnet 40 moves from the first position P1 to the second position P2, the first elastic member 44 is gradually compressed, so that the reverse elastic force applied by the first elastic member 44 on the first magnet 40 gradually increases. When the current value flowing through the movable spring 54 is greater than the threshold current but has not reached the short-circuit current, the gradually increasing reverse elastic force will keep the first magnet 40 at a certain intermediate position between the first position P1 and the second position P2. When the current value flowing through the movable spring 54 reaches the short-circuit current, a greater magnetic attraction is generated between the first magnet 40 and the second magnet 55, which is sufficient to overcome the reverse elastic force of the first elastic member 44, thereby causing the first magnet 40 to continue to move toward the second position P2 and continue to compress the first elastic member 44 until the first magnet 40 moves to the second position P2.

As shown in Figures 5 and 10, Figure 10 shows a partial enlarged view of the position P in Figure 4. The first magnetic conductor 40 is movably connected to the holding member 42 via a limiting structure 43, which is used to limit the movement of the first magnetic conductor 40 relative to the holding member 42 between the first position P1 and the second position P2.

The limiting structure 43 includes a limiting groove 431 and a limiting block 432. The limiting groove 431 is provided on one of the first magnetic conductor 40 and the retaining member 42, and the limiting groove 431 extends along the moving direction D1 of the movable spring 54. The limiting block 432 is provided on the other of the first magnetic conductor 40 and the retaining member 42, and the limiting block 432 and the limiting groove 431 can be slidably matched.

In this embodiment, the limiting groove 431 is formed on the holding member 42, specifically, the limiting groove 431 is formed on the first bracket 421. The limiting block 432 is formed on the first magnetic conductor 40, specifically, the limiting block 432 is protruded from the side wall of the first magnetic conductor 40.

Of course, in other embodiments, the limiting groove 431 may also be formed on the first magnetic conductor 40 , and the limiting block 432 may be formed on the retaining member 42 .

When the first magnetizer 40 is at the first position P1, there is a first gap between the limit block 432 and the groove wall 435 of the limit groove 431. When the first magnetizer 40 is at the second position P2, there is a second gap between the limit block 432 and the groove wall 435 of the limit groove 431. The first gap is smaller than the second gap.

Since the first gap is smaller than the second gap, the size of the limit groove 431 presents a "one end large and the other end small" structure. Therefore, when the first magnetic conductor 40 moves from the first position P1 to the second position P2, the gap between the limit block 432 and the groove wall 435 of the limit groove 431 becomes larger, which can prevent the limit block 432 and the groove wall of the limit groove 431 from rubbing and getting stuck.

As shown in FIGS. 8 and 9 , the groove wall of the limiting groove 431 has a stop wall 433 at one end close to the second magnetizer 55. When the first magnetizer 40 moves to the second position P2, the stop wall 433 stops at the stop block 432. At this time, the distance between the first magnetizer 40 and the second magnetizer 55 is the second spacing H2, and the stop wall 433 stops at the stop block 432, so that the first magnetizer 40 is fixed relative to the contact container 10, so that a stable and reliable magnetic attraction can be provided to the second magnetizer 55, meeting the requirement of anti-short circuit.

It is understandable that when the first magnetic conductor 40 moves to the second position P2, the stop wall 433 stops at the limit block 432. When the first magnetic conductor 40 and the second magnetic conductor 55 are in contact with each other, or are spaced apart from each other, the second interval H2 can be considered to be equal to zero.

As shown in Figures 6 and 7, when the first magnetic conductor 40 is located at the first position P1, under the action of the elastic force of the first elastic member 44, the first magnetic conductor 40 abuts against the first bracket 421 of the retaining member 42, and the limiting block 432 is spaced apart from the limiting wall 434 of the limiting groove 431.

Of course, in other embodiments, the first magnetic conductor 40 can be maintained in the first position P1 in the retaining member 42 in the following manner: under the action of the elastic force of the first elastic member 44, the limit block 432 can abut against another limit wall 434 in the limit groove 431 relative to the stop wall 433, so that the first magnetic conductor 40 is stably maintained in the retaining member 42.

As shown in FIGS. 5 , 6 and 8 , the relay further includes a connector 30 , which passes through the second through hole 103 and includes a first end 31 and a second end 32 , wherein the first end 31 is connected to the contact container 10 , and the second end 32 is connected to the retaining member 42 .

In this embodiment, the second end 32 of the connecting member 30 is connected to the first bracket 421 .

The contact container 10 is provided with a second through hole 103, and the connector 30 is passed through the second through hole 103, so that the connector 30 is connected to the contact container 10, and the holding member 42 is connected to the connector 30. The holding member 42 is connected to the contact container 10 through the connector 30, but is not directly connected to the contact container 10, so that the connection process is unobstructed and visualized, which is convenient for operation and ensures the reliability of the connection.

Furthermore, the first through hole 102 and the second through hole 103 are both formed on the top wall 111 of the ceramic cover 11 , and the first end 31 of the connecting member 30 is connected to the outer wall surface of the top wall 111 .

In the outer wall surface of the top wall 111, a first metallization layer 113 is provided at the periphery of the first through hole 102, and a second metallization layer 114 is provided at the periphery of the second through hole 103. The static contact lead-out terminal 20 is welded to the top wall 111 through the first metallization layer 113, and the first end 31 of the connector 30 is welded to the top wall 111 through the second metallization layer 114.

Compared with the inner wall surface of the ceramic cover 11, the outer wall surface of the top wall 111 of the ceramic cover 11 is easier to form a welding plane. In addition, since the top wall 111 of the ceramic cover 11 needs to be provided with a static contact lead-out terminal 20, and when the static contact lead-out terminal 20 is welded to the top wall 111, a metallization layer also needs to be provided on the periphery of the first through hole 102, so when processing the first metallization layer 113 of the first through hole 102, the second metallization layer 114 of the second through hole 103 is processed at the same time. Therefore, by welding the connector 30 to the outer wall surface of the top wall 111 of the ceramic cover 11, the metallization layer can be processed only on the outer wall surface of the top wall 111, without processing the metallization layer on the inner wall surface of the top wall 111, which is convenient for processing and simplifies the processing steps.

The holding member 42 is spaced apart from the inner wall surface of the top wall 111. By spacing the holding member 42 and the inner wall surface of the top wall 111, there is a gap between the holding member 42 and the inner wall surface of the top wall 111. Since the holding member 42 does not directly contact the inner wall surface of the top wall 111, the setting of the holding member 42 does not affect the creepage of the pair of static contact lead-out terminals 20. distance.

In one embodiment, the top wall 111 and the side wall 112 are separate structures and are connected by welding.

It is understandable that by designing the ceramic cover 11 as a split structure of the top wall 111 and the side wall 112, it is more convenient to connect the connector 30 to the top wall 111. Of course, the top wall 111 and the side wall 112 can also be bonded.

Specifically, since the top wall 111 is in sheet shape, the sheet structure makes it easier to process the first through hole 102, the second through hole 103, the first metallization layer 113, and the second metallization layer 114 on the top wall 111. Furthermore, the sheet structure also makes it easier to weld the connector 30 and the top wall 111, and the static contact lead-out terminal 20 and the top wall 111.

Of course, in another embodiment, the top wall 111 and the side wall 112 may also be an integral structure.

There are many ways to connect the second end 32 of the connector 30 and the retaining member 42, such as welding, riveting, gluing, etc.

As shown in Fig. 11, Fig. 11 is a schematic diagram showing that the holding member 42 is fixedly connected to the fixing frame 70. In addition to the above-mentioned holding member 42 being fixedly connected to the ceramic cover 11, the holding member 42 can also be fixedly connected to a fixing frame 70.

Specifically, the relay further includes a fixing frame 70, which is disposed in the contact chamber 101 and fixedly connected to the yoke plate 13. The retaining member 42 is fixedly connected to the fixing frame 70. For example, the first bracket 421 of the retaining member 42 is riveted to the fixing frame 70, but the present invention is not limited thereto.

It can be understood that the various embodiments/implementations provided in the present disclosure can be combined with each other without causing any contradiction, and they will not be illustrated one by one here.

In the present disclosure, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the terms "a pair" and "one" are only used to introduce technical features and should not be understood as limiting the specific quantity of the technical features, unless otherwise clearly defined; the term "multiple" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present disclosure.

In the description of this specification, the terms "one embodiment", "some embodiments", "specific embodiments", etc. Description means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

A relay, comprising:

a contact container having a contact chamber;

A pair of static contact lead-out terminals connected to the contact container; at least a portion of the static contact lead-out terminals is located in the contact chamber;

a retaining member, at least partially disposed in the contact chamber and fixedly disposed relative to the contact container;

a first magnetic conductor movably connected to the retaining member between a first position and a second position; and

The movable component includes a movable spring and a second magnetic conductor, wherein the two ends of the movable spring are used to contact or separate with a pair of the static contact lead-out ends; the first magnetic conductor is arranged on the side of the movable spring facing the static contact lead-out ends, and the second magnetic conductor is fixedly connected to the side of the movable spring facing away from the static contact lead-out ends, and the second magnetic conductor is used to form a magnetic circuit with the first magnetic conductor; in the first position, the distance between the first magnetic conductor and the second magnetic conductor is a first spacing, and in the second position, the distance between the first magnetic conductor and the second magnetic conductor is a second spacing, and the first spacing is greater than the second spacing.
The relay according to claim 1, wherein the first magnetic conductor is located at the first position, and the current value flowing through the movable reed is less than or equal to a threshold current;

When the current value flowing through the movable reed is greater than the threshold current, the first magnetic conductor moves from the first position to the second position.
The relay according to claim 1, wherein the first magnetic conductor is movably connected to the retaining member via a limiting structure, and the limiting structure is used to limit the movement of the first magnetic conductor relative to the retaining member between the first position and the second position.
The relay according to claim 3, wherein the limiting structure comprises:

a limiting groove, provided on one of the first magnetic conductor and the retaining member, the limiting groove extending along the moving direction of the movable spring; a groove wall of the limiting groove having a stop wall at one end close to the second magnetic conductor; and

A limit block is arranged on the other of the first magnetic conductor and the retaining member, the limit block is slidably matched with the limit groove, and in the second position, the stop wall stops at the limit block.
The relay according to claim 4, wherein, in the first position, there is a first gap between the limiting block and the slot wall of the limiting slot;

In the second position, a second gap is provided between the limiting block and the groove wall of the limiting groove;

The first gap is smaller than the second gap.
The relay according to claim 1, wherein:

The contact container further has a pair of first through holes and a second through hole, wherein the first through hole and the second through hole are both connected to the contact chamber; a pair of static contact lead-out terminals are correspondingly arranged in the pair of first through holes;

The relay further includes a connecting member, which is passed through the second through hole and includes a first end and a second end, wherein the first end is connected to the contact container, and the second end is connected to the retaining member.
The relay according to claim 6, wherein the contact container comprises:

yoke iron plate; and

An insulating cover connected to the yoke plate; the insulating cover and the yoke plate enclose the contact chamber;

The first through hole and the second through hole are formed in the insulating cover, and the first end of the connecting member is connected to the outer wall surface of the insulating cover.
The relay according to claim 7, wherein the insulating cover comprises a ceramic cover and a frame sheet, the ceramic cover comprises a top wall and a side wall, one end of the side wall is connected to the periphery of the top wall, and the other end of the side wall is connected to the yoke plate through the frame sheet;

The first through hole and the second through hole are opened in the top wall; in the outer wall surface of the top wall, a first metallization layer is provided at the periphery of the first through hole, and a second metallization layer is provided at the periphery of the second through hole;

The static contact lead-out terminal is welded to the top wall through the first metallization layer, and the first end of the connector is welded to the top wall through the second metallization layer.
The relay according to claim 8, wherein the top wall and the side wall are separate structures, or the top wall and the side wall are an integral structure.
The relay according to claim 8, wherein the holding member is spaced apart from an inner wall surface of the top wall.
The relay according to claim 1, wherein the contact container comprises:

yoke iron plate; and

An insulating cover connected to the yoke plate; the insulating cover and the yoke plate enclose the contact chamber;

The relay further includes a fixing frame, which is disposed in the contact chamber and fixedly connected to the yoke plate, and the retaining member is fixedly connected to the fixing frame.
The relay according to claim 1, wherein the relay further comprises:

A first elastic member is provided between the first magnetic conductor and the holding member, and is used to provide a first magnetic conductor with a first elastic member. An elastic force is applied to move toward the first position.
The relay according to claim 12, wherein the holding member comprises:

A first bracket, fixedly arranged relative to the contact container;

The second bracket is detachably connected to the first bracket and forms a retaining cavity together with the first bracket; the first elastic member and the first magnetic conductor are located in the retaining cavity, and a receiving groove is provided on the side of the first magnetic conductor facing the second bracket, one end of the first elastic member abuts against the second bracket, and the other end abuts against the bottom of the receiving groove.
The relay according to claim 12, wherein the first elastic member is a spring.
The relay according to claim 1, wherein the relay further comprises a push rod assembly, the push rod assembly comprising:

A rod portion, movable relative to the contact container along an axial direction of the rod portion;

a base, which is arranged at one end of the rod portion along the axial direction and at least partially extends into the contact chamber; the movable member is movably connected to the base along the axial direction of the rod portion; and

The second elastic member is connected to the movable component and the base, and is used for applying an elastic force to the movable component to move toward the first magnetic conductor.
The relay according to claim 1, wherein the holding member is located between a pair of the stationary contact terminals.
The relay according to claim 1, wherein the holding member is made of a metal material.
The relay according to claim 1, wherein in the second position, the second distance between the first magnetic conductor and the second magnetic conductor is equal to zero.