WO2024078542A1

WO2024078542A1 - Relay

Info

Publication number: WO2024078542A1
Application number: PCT/CN2023/124058
Authority: WO
Inventors: 代文广; 王萌; 苏礼季; 陈松生
Original assignee: 厦门宏发电力电器有限公司
Priority date: 2022-10-12
Filing date: 2023-10-11
Publication date: 2024-04-18
Also published as: CN117877930A

Abstract

Provided is a relay, comprising a contact container (10), a pair of static contact lead-out terminals (20), a first magnetic conductor (40), a push rod assembly (50), and a movable contact assembly (53). The first magnetic conductor (40) comprises a connecting portion (410) and a magnetically conductive portion (420). The push rod assembly (50) comprises a rod portion (51) and a second magnetic conductor (60). The second magnetic conductor (60) is staggered with the magnetic conductive portion (420) along an axial direction of the rod portion (51), and corresponds to a connecting portion (4110). The movable contact assembly (53) is movable between a first position and a second position relative to a support base (52) along the axial direction of the rod portion (51), and the movable contact assembly (53) comprises a movable reed (54) and a third magnetic conductor (55). The distance between the third magnetic conductor (55) and the connecting portion (410) is greater than the distance between the third magnetic conductor (55) and the magnetic conductive portion (420).

Description

Relay

This disclosure claims priority to Chinese patent application number 202211248733.8, filed on October 12, 2022, and named “Relay”, the entire contents of which are incorporated herein by reference in their entirety.

Technical Field

The present disclosure relates to a 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 at a fixed position other than the movable component. However, although the short-circuit resistance of the fixed anti-short-circuit structure is greatly enhanced, the short-circuit resistance and breaking resistance are negatively correlated, resulting in a weakened breaking resistance. However, the follower anti-short-circuit structure is affected by the holding force of the moving iron core. When the short-circuit current is high, 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 small volume and lightweight.

Summary of the invention

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

According to one aspect of the present disclosure, a relay of an embodiment of the present disclosure includes a contact container, a pair of static contact lead-out terminals, a first magnetic conductor, a push rod assembly, a movable contact assembly and an elastic member, wherein the contact container has a contact chamber; a pair of static contact lead-out terminals are connected to the contact container, and at least a portion of each of the static contact lead-out terminals is located in the contact chamber; the first magnetic conductor is disposed in the contact chamber; the first magnetic conductor includes a connecting portion and a magnetic conductor connected to the connecting portion, and the first magnetic conductor is fixedly disposed relative to the contact container through the connecting portion; the push rod assembly includes a rod portion and a second magnetic conductor; the rod portion is relative to the The contact container is movable along the axial direction of the rod portion, and the second magnetic conductor is arranged at one end of the rod portion. Along the axial direction of the rod portion, the second magnetic conductor is staggered with the magnetic conductor and corresponds to the connecting portion; the moving contact assembly is movable relative to the push rod assembly along the axial direction of the rod portion, between a first position close to the static contact lead-out end and a second position away from the static contact lead-out end, and the moving contact assembly includes a moving reed and a third magnetic conductor, the first magnetic conductor and the second magnetic conductor are arranged on a side of the moving reed facing the static contact lead-out end, and the third magnetic conductor is fixed along the axial direction of the rod portion. Connected to the side of the movable spring sheet away from the first magnetic conductor and the second magnetic conductor; the third magnetic conductor and the first magnetic conductor are used to form a first magnetic conductive circuit, and the third magnetic conductor and the second magnetic conductor are used to form a second magnetic conductive circuit; the distance between the third magnetic conductor and the connecting portion is greater than the distance between the third magnetic conductor and the magnetic conductive portion.

According to an embodiment of the present disclosure, an elastic member connects the movable contact assembly and the push rod assembly, and is used to apply an elastic force to the movable contact assembly to move toward the first position.

According to an embodiment of the present disclosure, the magnetic conductive portion and the connecting portion are an integral structure, and the magnetic conductive portion extends from the connecting portion toward the movable reed.

According to an embodiment of the present disclosure, the first magnetic conductor includes two oppositely disposed magnetic conductors, and the two magnetic conductors are respectively connected to two opposite sides of the connecting portion along the length direction of the movable spring sheet, so that the first magnetic conductor forms an inverted U shape.

According to an embodiment of the present disclosure, when the moving contact assembly is in the first position, the magnetic distance between the magnetic conductive portion and the third magnetic conductive body is greater than the magnetic distance between the second magnetic conductive body and the third magnetic conductive body.

According to an embodiment of the present disclosure, when the movable contact assembly is in the first position, the second magnetic conductor is in direct contact with the third magnetic conductor.

According to one embodiment of the present disclosure, the push rod assembly also includes a support seat, which is fixedly disposed at one end of the rod portion along the axial direction and at least partially extends into the contact chamber, the second magnetic conductor is fixedly connected to the support seat, and the elastic member is disposed between the moving contact assembly and the support seat.

According to one embodiment of the present disclosure, the support seat comprises:

A base connected to one end of the rod, wherein the elastic member is disposed between the base and the moving contact assembly; and

The bracket is connected to the base; the second magnetic conductor is connected to the inner wall surface of the bracket, and the movable spring sheet and the third magnetic conductor are movably arranged in the space surrounded by the base and the bracket.

According to one embodiment of the present disclosure, the bracket comprises:

A top portion, wherein the second magnetic conductor is connected to an inner wall surface of the top portion; and

The two side portions are respectively connected to the two sides of the top and extend from the top toward the base; the ends of the two side portions away from the top are respectively connected to the base, and the two side portions, the top and the base together form a space for the moving contact assembly to move.

According to an embodiment of the present disclosure, the contact container further has a pair of first through holes and a second through hole, the first through hole and the second through hole are both connected to the contact chamber; a pair of static contact lead 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 connecting portion.

According to one embodiment of the present disclosure, the contact container comprises:

yoke iron plate; and

The insulating cover comprises a top wall and a side wall, wherein 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 iron plate;

Wherein, the first through hole and the second through hole are opened in the top wall, and the first end of the connecting member is connected to the outer wall surface of the top wall.

According to an embodiment of the present disclosure, the insulating cover includes a ceramic cover and a frame sheet, the ceramic cover includes the top wall and the side wall, and the other end of the side wall is connected to the yoke plate through the frame sheet;

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 an embodiment of the present disclosure, the top wall and the side wall are an integral structure; or, the top wall and the side wall are separate structures and are connected by welding.

According to one embodiment of the present disclosure, the connecting portion is spaced apart from the inner wall surface of the top wall.

yoke iron plate; and

An insulating cover connected to the yoke iron plate;

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

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

In the relay of the disclosed embodiment, the first magnetic conductor is fixedly arranged relative to the contact container, and a fixed anti-short-circuit structure is formed between the magnetic portion and the third magnetic conductor, a follow-up anti-short-circuit structure is formed between the second magnetic conductor and the third magnetic conductor of the push rod assembly, the magnetic portion of the first magnetic conductor and the second magnetic conductor are staggered along the axial direction of the rod, and the connecting portion of the first magnetic conductor corresponds to the second magnetic conductor along the axial direction of the rod. While meeting the requirements of anti-short-circuit and limit disconnection, the first magnetic conductor does not occupy too much space along the axial direction perpendicular to the rod, which is beneficial to reducing the volume of the relay.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the attached drawings.

FIG. 1 is a perspective schematic diagram of a relay according to the present disclosure.

FIG. 2 is a schematic diagram showing FIG. 1 with the ceramic cover and the frame removed.

FIG. 3 is a schematic top view of FIG. 1 .

FIG. 4 shows a cross-sectional view taken along line A-A in FIG. 3 .

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

FIG6 shows a cross-sectional view taken along line B-B in FIG3 , wherein the ceramic cover, frame sheet and connector are omitted and the overtravel is completed.

FIG7 shows a cross-sectional view taken along line C-C in FIG3 , wherein the ceramic cover, frame sheet and connector are omitted and the overtravel is completed.

FIG8 shows a cross-sectional view taken along line A-A in FIG3 , wherein the ceramic cover, frame sheet and connector are omitted and the overtravel is completed.

FIG9 shows a cross-sectional view taken along line B-B in FIG3 , wherein the ceramic cover, frame sheet and connector are omitted, and the movable spring sheet is just in contact with or just separated from the static contact lead-out terminal.

FIG10 shows a cross-sectional view taken along line C-C in FIG3 , wherein the ceramic cover, frame sheet and connector are omitted, and the movable spring sheet is just in contact with or just separated from the static contact lead-out terminal.

FIG11 shows a cross-sectional view taken along line A-A in FIG3 , in which the ceramic cover, frame sheet and connector are omitted, and the movable spring sheet is just in contact with or just separated from the static contact lead-out terminal.

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

The reference numerals are described as follows:

10. contact container; 101. contact chamber; 102. first through hole; 103. second through hole; 11a. insulation 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; 410. connector; 420. magnetic conductor; 50. push rod assembly; 51. rod; 52. support seat; 521. base; 522. Bracket; 523, top; 524, side; 53, moving contact assembly; 54, moving spring; 55, third magnetic conductor; 56, elastic member; 60, second magnetic conductor; 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; 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 many forms and should not be construed as limited to the embodiments set forth herein. Although relative terms, such as "above" and "below" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as the orientation of the examples described in the accompanying drawings. It is understood that if the device of the illustration is flipped so that it is upside down, the component described as being "above" will become the component "below". Other relative terms, such as "top", "bottom", etc., are also intended to have similar meanings. When a structure is "on" other structures, it may mean that A certain structure is formed integrally with another structure, or it means that the certain structure is "directly" disposed on the other structure, or it means that the certain structure is "indirectly" disposed on the other structure via another structure.

The terms "a", "an", "the" and "said" are used to indicate the presence of one or more elements/components/etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements/components/etc. may exist in addition to the listed elements/components/etc.; the terms "first", "second", etc. are used merely as labels and are not intended to limit the quantity of their objects.

As shown in FIG. 12 , FIG. 12 shows an exploded schematic diagram of a relay according to an embodiment 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 terminal 20 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 20 of the sealing unit 1400 and the moving reed piece 54 .

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 rectangular. The two arc extinguishing magnets 1310 are respectively disposed on both sides of the sealing unit 1400 and are disposed opposite to each other along the length direction D2 of the movable spring piece 54.

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 20 and the movable reed piece 54. Therefore, the arc generated between the static contact lead-out terminal 20 and the movable reed piece 54 is stretched 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 a relay of the first embodiment of the present disclosure. Figure 2 shows a schematic diagram of Figure 1 without the ceramic cover 11 and the frame sheet 12. Figure 3 shows a top view of Figure 1. Figure 4 shows a cross-sectional view of A-A in Figure 3. Figure 5 shows an exploded schematic diagram of Figure 1.

The sealing unit 1400 of the embodiment of the present disclosure includes a contact container 10 , a pair of static contact lead-out terminals 20 , a first magnetic conductor 40 , a push rod assembly 50 , a movable contact assembly 53 and an elastic member 56 .

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

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 surface 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 top wall 111, and the other end of the side wall 112 is connected to the yoke plate 13 through the frame sheet 12. In this embodiment, 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 therethrough, and the second through hole 103 is used for a connector 30 to pass therethrough.

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.

The number of the second through holes 103 may be two, for two connecting members 30 to pass through, but the present invention is not limited thereto.

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 .

The first magnetic conductor 40 is disposed in the contact chamber 101 and fixed relative to the contact container 10. The first magnetic conductor 40 includes a connecting portion 410 and a magnetic conductor 420 connected to the connecting portion 410. The first magnetic conductor 40 is fixed relative to the contact container 10 through the connecting portion 410, and the magnetic conductor 420 is used to form a magnetic circuit with the third magnetic conductor 55.

The push rod assembly 50 is movably connected to the contact container 10 along the movement direction D1. The push rod assembly 50 includes a rod portion 51, a support seat 52, and a second magnetic conductor 60. The rod portion 51 is movable relative to the contact container 10 along the axial direction of the rod portion 51 (i.e., along the movement direction D1), the support seat 52 is fixedly arranged at one end of the rod portion 51 along the axial direction, and at least partially extends into the contact chamber 101, and the second magnetic conductor 60 is fixedly connected to the support seat 52. Along the axial direction of the rod portion 51, the second magnetic conductor 60 is staggered with the magnetic conductor portion 420 and corresponds to the connecting portion 410.

It should be noted that along the axial direction of the rod 51, the second magnetic conductor 60 and the magnetic conductor 420 are staggered. The second magnetic conductor 60 corresponds to the connecting portion 410, which means that along the axial direction of the rod 51, the orthographic projection of the second magnetic conductor 60 relative to the movable spring piece 54 does not overlap with the orthographic projection of the magnetic conductor 420 relative to the movable spring piece 54. The second magnetic conductor 60 corresponds to the connecting portion 410, which means that along the axial direction of the rod 51, the orthographic projection of the second magnetic conductor 60 relative to the movable spring piece 54 at least partially overlaps with the orthographic projection of the magnetic conductor 420 relative to the movable spring piece 54.

As an example, the second magnetic conductor 60 and the support seat 52 may be fixed to each other by riveting, but the present invention is not limited thereto.

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 communicates with the contact chamber 101 of the contact container 10. The rod 51 is axially movably disposed in the third through hole 131.

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.

The moving contact assembly 53 is movable relative to the push rod assembly 50 along the axial direction of the rod portion 51 between a first position close to the static contact lead-out terminal 20 and a second position away from the static contact lead-out terminal 20. The moving contact assembly 53 includes a moving reed 54 and a third magnet 55. The first magnet 40 and the second magnet 60 are located on the side of the moving reed 54 facing the static contact lead-out terminal 20. Along the axial direction of the rod portion 51, the third magnet 55 is fixedly connected to the side of the moving reed 54 away from the first magnet 40 and the second magnet 60. That is, along the thickness direction of the moving reed 54 (i.e., along the moving direction D1), the first magnet 40 and the second magnet 60 are located on one side of the moving reed 54, and the third magnet 55 is located on the other side of the moving reed 54. The distance between the third magnet 55 and the connecting portion 410 is greater than the distance between the third magnet 55 and the magnet portion 420.

It should be noted that the “first position” and “second position” in which the movable contact assembly 53 is movable between the first position and the second position along the axial direction of the rod portion 51 relative to the push rod assembly 50 refer to the relative positions of the movable contact assembly 53 and the push rod assembly 50 .

Specifically, when the electromagnet unit 1200 is energized, it can drive the rod 51, the support seat 52 and the moving contact assembly 53 to move toward the static contact lead-out terminal 20. When the moving contact assembly 53 contacts the static contact lead-out terminal 20, the moving contact assembly 53 is stopped by the static contact lead-out terminal 20, while the rod 51 and the support seat 52 continue to move upward until the overtravel process is completed. During the overtravel process, relative movement occurs between the moving contact assembly 53 and the push rod assembly 50.

If the moving contact assembly 53 is defined as stationary during the overtravel process, the push rod assembly 50 will move upward relative to the moving contact assembly 53. If the push rod assembly 50 is defined as stationary during the overtravel process, the moving contact assembly 53 will move downward relative to the push rod assembly 50.

Then, when the moving contact assembly 53 is separated from the static contact lead-out terminal 20 or the moving contact assembly 53 is just in contact with the static contact lead-out terminal 20, the moving contact assembly 53 is located at the first position relative to the push rod assembly 50, that is, the moving contact assembly 53 is close to the static contact lead-out terminal 20 relative to the push rod assembly 50. When in the overtravel process, the moving contact assembly 53 moves downward relative to the push rod assembly 50, that is, the moving contact assembly 53 moves relative to the push rod assembly 50 in a direction away from the static contact lead-out terminal 20, until the moving contact assembly 53 moves to the second position relative to the push rod assembly 50. When the moving contact assembly 53 is in the overtravel process, the moving contact assembly 53 moves downward relative to the push rod assembly 50, that is, the moving contact assembly 53 moves relative to the push rod assembly 50 in a direction away from the static contact lead-out terminal 20, until the moving contact assembly 53 moves to the second position relative to the push rod assembly 50. When the member 53 moves to the second position relative to the push rod assembly 50, the overtravel is completed. At this time, the compression amount of the elastic member 56 is at a maximum value.

It can be seen that when the movable contact assembly 53 is located at the first position relative to the push rod assembly 50, it can be considered that the movable contact assembly 53 is separated from the static contact lead-out terminal 20 or the movable contact assembly 53 is just in contact with the static contact lead-out terminal 20. When the movable contact assembly 53 is located at the second position relative to the push rod assembly 50, the overtravel is completed.

As an example, the third magnetic conductor 55 and the movable spring 54 may be fixed by riveting, but the present invention is not limited thereto.

It is understandable that the first magnetic conductor 40 , the second magnetic conductor 60 and the third magnetic conductor 55 can all be made of materials such as iron, cobalt, nickel, and alloys thereof.

In one embodiment, the second magnetic conductor 60 may be in a straight line shape, and the first magnetic conductor 40 and the third magnetic conductor 55 may be in a U shape, but the present invention is not limited thereto.

It can be understood that the first magnetic conductor 40, the second magnetic conductor 60 and the third magnetic conductor 55 can be designed to include a plurality of stacked magnetic conductor sheets as required.

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 elastic member 56 is disposed between the movable contact assembly 53 and the support seat 52 , and is used to apply an elastic force to the movable contact assembly 53 to move toward the first position.

As an example, the elastic member 56 may be a spring, but is not limited thereto.

In one embodiment, one end of the elastic member 56 abuts against the support base 52 , and the other end abuts against the third magnetic conductor 55 of the movable contact assembly 53 .

Of course, in other embodiments, a through hole may be provided on the third magnetic conductor 55 , and the elastic member 56 passes through the through hole and abuts against the movable spring piece 54 .

The support seat 52 includes a base 521 and a bracket 522. The base 521 is connected to one end of the rod 51 along the axial direction, and the bracket 522 is connected to the base 521. The second magnet 60 is connected to the inner wall surface of the bracket 522, the movable spring 54 and the third magnet 55 are movably arranged between the base 521 and the bracket 522, and one end of the elastic member 56 abuts against the base 521, and the other end abuts against the third magnet 55.

In one embodiment, the bracket 522 may be in an inverted U shape and be engaged with the base 521. The base 521 and the bracket 522 together form a chamber, which is used to accommodate the moving contact assembly 53 and the elastic member 56.

The bracket 522 may include a top 523 and two side portions 524, the two side portions 524 are respectively connected to the two sides of the top 523, and extend from the top 523 toward the base 521, so that the bracket 522 forms an inverted U shape. One end of the two side portions 524 away from the top 523 is respectively connected to the base 521. A space is formed between the two side portions 524 for the movable spring 54 and the third magnetic conductor 55 to pass through and move.

The second magnetic conductor 60 is connected to the inner wall surface of the top 523. When the movable spring 54 is not in contact with the static contact lead-out terminal 20 or the movable spring 54 has just been in contact with the static contact lead-out terminal 20, the movable spring 54 abuts against the second magnetic conductor 60 under the elastic force of the elastic member 56. During the overtravel process, the static contact lead-out terminal 20 stops the movable contact assembly 53 (the movable spring 54 and the third magnetic conductor 55) and keeps the movable contact assembly 53 stationary, while the rod 51 drives the support seat 52 together with the second magnetic conductor 60 to continue to move upward, and at this time, the movable contact assembly 53 and the base 521 jointly squeeze the elastic member 56.

It is understandable that in other embodiments, the second magnetic conductor 60 may not be fixedly connected to the bracket 522 of the support seat 52, but may be fixedly connected to one end of the rod 51. Specifically, the moving contact assembly 53 may be provided with a through hole, the rod 51 is passed through the through hole of the moving contact assembly 53, and the second magnetic conductor 60 is provided at one end of the rod 51.

The sealing unit 1400 further 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 and the moving iron core 1240 of the electromagnet unit 1200, which will be described in detail below.

As shown in FIG. 4 and FIG. 22 , the electromagnet unit 1200 includes a coil frame 1210, a coil 1220, a static iron core (not shown in the figure), 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 is fixedly arranged in the metal cover 1410, and part of the static iron core extends into the third through hole 131. The static iron core has a perforation, which is arranged corresponding to the position of the third through hole 131 for the rod 51 to pass therethrough. The moving iron core 1240 is movably arranged in the metal cover 1410 and arranged opposite to the static iron core. The moving iron core 1240 is connected to the rod 51. When the coil 1220 is energized, the moving iron core 1240 is attracted by the static iron core. The moving 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 and the movable iron core 1240 to reset the movable iron core 1240 when the coil 1220 is powered off. The reset member 1250 may be a spring and is sleeved outside the rod 51 .

As shown in Figures 6 to 8, Figure 6 shows a cross-sectional view of B-B in Figure 3, wherein the ceramic cover, frame sheet and connector are omitted, and the overtravel is completed. Figure 7 shows a cross-sectional view of C-C in Figure 3, wherein the ceramic cover, frame sheet and connector are omitted, and the overtravel is completed. Figure 8 shows a cross-sectional view of A-A in Figure 3, wherein the ceramic cover, frame sheet and connector are omitted, and the overtravel is completed.

It should be noted that the state shown in Figures 6 to 8 is when the overtravel is completed. In this state, it can be considered that the movable contact assembly 53 is in the second position relative to the push rod assembly 50.

As shown in Figures 6 and 7, a first magnetic conductive loop is formed between the first magnetic conductive body 40 and the third magnetic conductive body 55, so a magnetic attraction force is generated between the first magnetic conductive body 40 and the third magnetic conductive body 55. A second magnetic conductive loop is formed between the second magnetic conductive body 60 and the third magnetic conductive body 55, so a magnetic attraction force is generated between the second magnetic conductive body 60 and the third magnetic conductive body 55. Since the first magnetic conductive body 40 is fixedly arranged relative to the contact container 10, when a short-circuit current is passed, a fixed anti-short-circuit structure is formed between the first magnetic conductive body 40 and the third magnetic conductive body 55, and the holding force of the fixed anti-short-circuit structure is provided by the contact container 10. Since the second magnetic conductive body 60 is fixedly connected to the support seat 52 of the push rod assembly 50, when a short-circuit current is passed, a follow-up anti-short-circuit structure is formed between the second magnetic conductive body 60 and the third magnetic conductive body 55, and the holding force of the follow-up anti-short-circuit structure is Provided by the coil 1220 of the relay. Under the premise that the coil 1220 is driven constantly, the double short-circuit-resistant structure of the embodiment of the present disclosure effectively improves the upper limit of the short-circuit-resistant current carrying capacity.

It should be noted that, as shown in Figure 8, along the axial direction of the rod portion 51, the second magnetic conductor 60 and the magnetic portion 420 are staggered, so that the magnetic circuit formed between the magnetic portion 420 and the third magnetic conductor 55, and the magnetic circuit formed between the second magnetic conductor 60 and the third magnetic conductor 55, the two magnetic circuits will not affect each other, so that the magnetic attraction force of the magnetic portion 420 and the magnetic attraction force of the second magnetic conductor 60 will not affect each other, thereby ensuring the anti-short circuit effect.

In addition, the distance between the third magnetizer 55 and the connecting portion 410 of the first magnetizer 40 is greater than the distance between the third magnetizer 55 and the magnetic portion 420 of the first magnetizer 40. It can be understood that the magnetic flux mainly flows to the magnetic circuit with a smaller magnetic spacing. Therefore, in combination with Figures 6 and 7, it can be seen that when the short-circuit current is passed through the movable spring 54, most of the magnetic flux will flow between the third magnetizer 55 and the magnetic portion 420 and between the third magnetizer 55 and the second magnetizer 60, while there is only a small amount of magnetic flux between the third magnetizer 55 and the connecting portion 410. Therefore, although the second magnetic conductor 60 and the connecting part 410 are arranged correspondingly along the axial direction of the rod part 51 (that is, the direct projections of the second magnetic conductor 60 and the connecting part 410 on the movable spring plate 54 have an overlapping part), most of the magnetic flux will flow to the magnetic conductor part 420 and the second magnetic conductor 60, and very little magnetic flux will flow to the connecting part 410. Therefore, the magnetic attraction between the connecting part 410 and the second magnetic conductor 60 only slightly weakens the magnetic attraction generated between the first magnetic conductor 40 as a whole and the third magnetic conductor 55, and will not affect the short-circuit resistance.

It is worth mentioning that along the axial direction of the rod portion 51, the connecting portion 410 of the first magnetic conductor 40 corresponds to the second magnetic conductor 60, while the magnetic portion 420 of the first magnetic conductor 40 is staggered with the second magnetic conductor 60. In this way, the first magnetic conductor 40 will not occupy too much space along the axial direction perpendicular to the rod portion 51, which is beneficial to reducing the volume of the relay.

As shown in Figures 9 to 11, Figure 9 shows a cross-sectional view of B-B in Figure 3, wherein the ceramic cover, frame sheet and connector are omitted, and the movable spring sheet is just in contact with or just separated from the static contact lead-out terminal. Figure 10 shows a cross-sectional view of C-C in Figure 3, wherein the ceramic cover, frame sheet and connector are omitted, and the movable spring sheet is just in contact with or just separated from the static contact lead-out terminal. Figure 11 shows a cross-sectional view of A-A in Figure 3, wherein the ceramic cover, frame sheet and connector are omitted, and the movable spring sheet is just in contact with or just separated from the static contact lead-out terminal.

It should be noted that Figures 9 to 11 show the state when the movable spring piece 54 and the static contact lead-out terminal 20 are just in contact or just separated. In this state, it can be considered that the movable contact assembly 53 is in the first position relative to the push rod assembly 50.

In order to conveniently illustrate that the relay of the present invention can meet the requirement of overload current interruption on the basis of improving the short-circuit resistance, FIG. 9 to FIG. 11 show the state when the moving spring piece 54 and the static contact lead-out terminal 20 are just separated as an example.

When the relay coil 1220 is de-energized, the push rod assembly 50 moves downward relative to the static contact lead-out terminal 20 under the action of the relay moving iron core 1240, which is equivalent to the moving contact assembly 53 moving from the second position to the first position relative to the push rod assembly 50, that is, switching from FIG. 7 to FIG. 10. During the movement of the moving contact assembly 53 from the second position to the first position, the magnetic spacing between the second magnetizer 60 and the third magnetizer 55 gradually decreases. When the moving contact assembly 53 moves to the first position, the second magnetizer 60 contacts the moving contact assembly 53. At this time, the second magnetizer 60 and the third magnetizer 55 are in contact. The magnetic distance between the third magnetic conductors 55 is smaller than the magnetic distance between the magnetic conductive portion 420 and the third magnetic conductors 55 .

It is understandable that most of the magnetic flux will flow to the magnetic circuit with a smaller magnetic spacing, that is, most of the magnetic flux will flow to the magnetic circuit formed by the second magnetic conductor 60 and the third magnetic conductor 55. For example, as shown in FIG10, a magnetic flux line is formed between the magnetic conductor portion 420 of the first magnetic conductor 40 and the third magnetic conductor 55. As shown in FIG9, three magnetic flux lines are formed between the second magnetic conductor 60 and the third magnetic conductor 55.

At this time, the magnetic attraction between the second magnetizer 60 and the third magnetizer 55 is relatively large, while the magnetic attraction between the magnetizer portion 420 and the third magnetizer 55 is relatively small. In addition, since the second magnetizer 60 is in contact with the moving contact assembly 53, the magnetic attraction between the second magnetizer 60 and the third magnetizer 55 is a variable internal force, which will not affect the breaking of the moving spring 54. Therefore, the moving spring 54 only needs to overcome the relatively small magnetic attraction between the magnetizer 420 and the third magnetizer 55 to achieve breaking. Moreover, along the axial direction of the rod 51, the second magnetizer 60 and the connecting portion 410 are arranged correspondingly (i.e., the second magnetizer 60 and the connecting portion 410 have overlapping parts relative to the positive projection of the moving spring 54), but since most of the magnetic flux will flow to the magnetizer 420 and the second magnetizer 60, and very little magnetic flux will flow to the connecting portion 410, the connecting portion 410 and the second magnetizer 60 only slightly weaken the magnetic attraction generated between the first magnetizer 40 as a whole and the third magnetizer 55, which is conducive to disconnection. In addition, the magnetic flux lines of the connecting portion 410 and the magnetic flux lines of the second magnetizer 60 are in the same direction, so that a repulsive force is generated between the connecting portion 410 and the second magnetizer 60, which is further conducive to disconnection.

It can be seen that the first magnet 40 is fixedly arranged relative to the contact container 10, and a fixed anti-short circuit structure is formed between the magnetic portion 420 and the third magnet 55. The second magnet 60 is fixedly connected to the support seat 52 of the push rod assembly 50, and a follow-up anti-short circuit structure is formed between the magnetic portion 420 and the third magnet 55. The magnetic portion 420 of the first magnet 40 and the second magnet 60 are staggered along the axial direction of the rod 51, and the connecting portion 410 of the first magnet 40 corresponds to the second magnet 60 along the axial direction of the rod 51. While meeting the requirements of anti-short circuit and limit disconnection, the first magnet 40 of the embodiment of the present invention will not occupy too much space along the axial direction perpendicular to the rod 51, which is beneficial to reducing the volume of the relay.

It can be understood that when the movable contact assembly 53 is in the first position relative to the push rod assembly 50 , the second magnetic conductor 60 and the third magnetic conductor 55 may be in direct contact or have a gap therebetween.

In this embodiment, the moving contact assembly 53 is in the first position relative to the push rod assembly 50, and the second magnetic conductor 60 is in direct contact with the third magnetic conductor 55. In this way, a larger portion of the magnetic flux will flow to the magnetic circuit formed by the second magnetic conductor 60 and the third magnetic conductor 55, and a smaller portion of the magnetic flux will flow to the magnetic circuit formed by the magnetic conductor 420 and the third magnetic conductor 55. The magnetic attraction between the magnetic conductor 420 and the third magnetic conductor 55 is smaller, which is more conducive to the disconnection of the moving spring 54 and the static contact lead-out terminal 20.

As shown in FIG. 4 and FIG. 5 , the magnetic conductive portion 420 and the connecting portion 410 are an integral structure, and the magnetic conductive portion 420 extends from the connecting portion 410 toward the movable reed 54 .

In this embodiment, the first magnetic conductor 40 includes two oppositely disposed magnetic conductors 420 . The two magnetic conductors 420 are respectively connected to two opposite sides of the connecting portion 410 along the length direction D2 of the movable spring 54 , so that the first magnetic conductor 40 forms an inverted U-shape.

Of course, in other embodiments, the first magnetic conductor 40 may also be L-shaped, one side of the L-shape may serve as the connecting portion 410 , and the other side may serve as the magnetic conductor 420 .

As shown in FIGS. 4 and 5 , the relay of the embodiment of the present disclosure further includes a connector 30 , which is passed 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 first magnetic conductor 40 .

In the relay of the disclosed embodiment, the connecting portion 410 of the first magnetic conductor 40 is connected to the contact container 10 through the connecting piece 30, but is not directly connected to the contact container 10, so that the connection process is unobstructed and visible, 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 connection portion 410 of the first magnetic conductor 40 is spaced apart from the inner wall surface of the top wall 111. The connection portion 410 of the first magnetic conductor 40 is spaced apart from the inner wall surface of the top wall 111, so that there is a gap between the connection portion 410 and the inner wall surface of the top wall 111. Since the connection portion 410 is not in direct contact with the inner wall surface of the top wall 111, the provision of the first magnetic conductor 40 does not affect the creepage distance of the pair of static contact lead-out terminals 20.

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, 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 first magnetic conductor 40, such as welding, riveting, gluing, etc.

Of course, in other embodiments, the first magnetic conductor 40 is fixedly arranged relative to the contact container 10. In addition to the above-mentioned first magnetic conductor 40 being fixedly connected to the ceramic cover 11 through the connecting member 30, the first magnetic conductor 40 can also be fixedly connected to the ceramic cover 11. Specifically, the relay further comprises a fixing frame, which is disposed in the contact chamber 101 and fixedly connected to the yoke plate 13. The connecting portion 410 of the first magnetic conductor 40 is fixedly connected to the fixing frame.

It should be understood that the present disclosure does not limit its application to the detailed structure and arrangement of the components proposed in this specification. The present disclosure can have other embodiments and can be implemented and executed in a variety of ways. The aforementioned variations and modifications fall within the scope of the present disclosure. It should be understood that the present disclosure disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or evident in the text and/or the drawings. All these different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best mode known for implementing the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

A relay, characterized in that it comprises:

a contact container having a contact chamber;

a pair of static contact lead-out terminals connected to the contact container, and at least a portion of each of the static contact lead-out terminals is located within the contact chamber;

A first magnetic conductor is disposed in the contact chamber; the first magnetic conductor includes a connecting portion and a magnetic conductor connected to the connecting portion, and the first magnetic conductor is fixedly disposed relative to the contact container through the connecting portion;

A push rod assembly, comprising a rod portion and a second magnetic conductor; the rod portion is movable relative to the contact container along the axial direction of the rod portion, the second magnetic conductor is arranged at one end of the rod portion, along the axial direction of the rod portion, the second magnetic conductor is staggered from the magnetic conductor portion and corresponds to the connecting portion;

The moving contact assembly is movable relative to the push rod assembly along the axial direction of the rod portion, between a first position close to the static contact lead-out end and a second position away from the static contact lead-out end. The moving contact assembly includes a moving spring and a third magnetic conductor. The first magnetic conductor and the second magnetic conductor are arranged on the side of the moving spring facing the static contact lead-out end. Along the axial direction of the rod portion, the third magnetic conductor is fixedly connected to the side of the moving spring away from the first magnetic conductor and the second magnetic conductor; the third magnetic conductor and the first magnetic conductor are used to form a first magnetic circuit, and the third magnetic conductor and the second magnetic conductor are used to form a second magnetic circuit; the distance between the third magnetic conductor and the connecting portion is greater than the distance between the third magnetic conductor and the magnetic portion.
The relay according to claim 1 is characterized by further comprising an elastic member, wherein the elastic member connects the movable contact assembly and the push rod assembly and is used to apply an elastic force to the movable contact assembly to move toward the first position.
The relay according to claim 1 is characterized in that the magnetic conductive portion and the connecting portion are an integral structure, and the magnetic conductive portion extends from the connecting portion toward the movable reed.
The relay according to claim 3 is characterized in that the first magnetic conductor includes two oppositely arranged magnetic conductors, and the two magnetic conductors are respectively connected to two opposite sides of the connecting portion along the length direction of the movable reed, so that the first magnetic conductor forms an inverted U shape.
The relay according to claim 1 is characterized in that, when the moving contact assembly is in the first position, the magnetic spacing between the magnetic conductive portion and the third magnetic conductive body is greater than the magnetic spacing between the second magnetic conductive body and the third magnetic conductive body.
The relay according to claim 5, characterized in that when the movable contact assembly is in the first position, the second magnetic conductor is in direct contact with the third magnetic conductor.
The relay according to claim 2 is characterized in that the push rod assembly also includes a support seat, which is fixedly arranged at one end of the rod portion along the axial direction and at least partially extends into the contact chamber, the second magnetic conductor is fixedly connected to the support seat, and the elastic member is arranged between the moving contact assembly and the support seat.
The relay according to claim 7, characterized in that the support base comprises:

A base connected to one end of the rod, wherein the elastic member is disposed between the base and the moving contact assembly; and

The bracket is connected to the base; the second magnetic conductor is connected to the inner wall surface of the bracket, and the movable spring sheet and the third magnetic conductor are movably arranged in the space surrounded by the base and the bracket.
The relay according to claim 8, characterized in that the bracket comprises:

A top portion, wherein the second magnetic conductor is connected to an inner wall surface of the top portion; and

The two side portions are respectively connected to the two sides of the top and extend from the top toward the base; the ends of the two side portions away from the top are respectively connected to the base, and the two side portions, the top and the base together form a space for the moving contact assembly to move.
The relay according to any one of claims 1 to 9, characterized in that the contact container further has a pair of first through holes and a second through hole, the first through hole and the second through hole are both connected to the contact chamber; a pair of the static contact lead terminals are correspondingly arranged in the pair of the 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 connecting portion.
The relay according to claim 10, characterized in that the contact container comprises:

yoke iron plate; and

The insulating cover comprises a top wall and a side wall, wherein 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 iron plate;

Wherein, the first through hole and the second through hole are opened in the top wall, and the first end of the connecting member is connected to the outer wall surface of the top wall.
The relay according to claim 11, characterized in that the insulating cover comprises a ceramic cover and a frame sheet, the ceramic cover comprises the top wall and the side wall, and the other end of the side wall is connected to the yoke plate through the frame sheet;

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 11 is characterized in that the top wall and the side wall are an integral structure; or the top wall and the side wall are separate structures and are connected by welding.
The relay according to claim 11, characterized in that the connecting portion is spaced apart from the inner wall surface of the top wall.
The relay according to claim 1, characterized in that the contact container comprises:

yoke iron plate; and

An insulating cover connected to the yoke iron plate;

The relay further comprises a fixing frame, which is arranged in the contact chamber and fixedly connected to the yoke. The connecting portion is fixedly connected to the fixing frame.