CN113539759A

CN113539759A - Breaker and 5G power distribution cabinet with same

Info

Publication number: CN113539759A
Application number: CN202010312464.1A
Authority: CN
Inventors: 孙振国; 周焱
Original assignee: Schneider Electric China Co Ltd
Current assignee: Schneider Electric China Co Ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2021-10-22
Anticipated expiration: 2040-04-20
Also published as: CN113539759B

Abstract

The present disclosure relates to a circuit breaker and a 5G power distribution cabinet having the circuit breaker. The circuit breaker includes a housing, a handle linkage assembly, an operating mechanism, a magnetic pull rod and a movable contact assembly. The operating mechanism includes a trip buckle and a lock buckle that are snap-connected at the closing position, and the magnetic pull rod is movably mounted to the housing; wherein, the magnetic pull rod and the trip buckle are arranged between There is a first protrusion, and a second protrusion is arranged between the magnetic pull rod and the movable contact assembly. When a short circuit occurs at the closing position of the circuit breaker, the magnetic pull rod passes through the first protrusion. It starts to abut with the jumping buckle and pushes the jumping buckle to release the buckle connection with the locking buckle. The contacts separate from the stationary contacts and prevent the movable contacts from re-contacting with the stationary contacts, thereby causing the circuit breaker to switch from the closed position to the open position.

Description

Breaker and 5G power distribution cabinet with same

Technical Field

The present disclosure relates to a circuit breaker and a 5G power distribution cabinet having the same.

Background

With the gradual laying of 5G base stations, circuit breakers suitable for 5G power distribution cabinets are required. To accommodate a 5G switch cabinet, the circuit breaker needs to be designed with an elongated low profile, thus requiring its internal structure to be compact.

In addition, the existing circuit breaker generally has a short-circuit protection function, once a short circuit occurs, a movable iron core of a magnetic assembly in the circuit breaker can drive an operating mechanism to trip, and meanwhile, a moving contact is repelled by electric repulsion force, so that the opening operation is realized. However, in practice, the operating mechanism cannot act in time at the moment of short circuit occurrence, and the moving contact is easily rebounded again after being repelled by the electric repulsive force, so that the service life of the circuit breaker is shortened or fusion welding occurs.

Disclosure of Invention

In view of the above-mentioned problems and needs, the present invention provides a novel circuit breaker and a 5G power distribution cabinet having the circuit breaker, which solve the above-mentioned problems and bring other technical effects due to the following technical features.

In one aspect, the present invention provides a circuit breaker comprising: a housing; the handle linkage assembly is used for switching the breaker between an opening position and a closing position; the moving contact component comprises a moving contact support and a moving contact arranged at one end of the moving contact support; the operating mechanism is in transmission connection with the handle linkage assembly and the moving contact assembly respectively, the operating mechanism drives the moving contact of the moving contact assembly to be in contact with the fixed contact at a switching-on position or to be separated from the fixed contact at a switching-off position under the driving of the handle linkage assembly, and the operating mechanism comprises a tripping buckle and a lock buckle which are in hasp connection at the switching-on position; and a magnetically actuated pull rod movably mounted to the housing,

when the breaker is in short circuit at a switching-on position, a movable iron core of a magnetic release of the breaker moves towards the magnetic pull rod and impacts the magnetic pull rod, so that the magnetic pull rod is abutted against the trip through the first protrusion and pushes the trip to be disconnected with the latch, and meanwhile, the magnetic pull rod is abutted against the second protrusion and pushes the movable contact component to separate the movable contact from the static contact and keep the movable contact component to prevent the movable contact from being contacted with the static contact again, so that the breaker is switched from the switching-on position to the switching-off position.

In some examples, a first end of the magnetic pull rod is pivotally mounted to the housing, a second end of the magnetic pull rod is configured to contact a plunger of the magnetic release, the first protrusion is disposed between the first and second ends of the magnetic pull rod and extends from an upper surface of the magnetic pull rod to protrude toward the jumper, and the jumper has an extension that contacts the first protrusion.

In some examples, the second protrusion is disposed at the other end of the movable contact support and extends and protrudes from a side surface of the movable contact support toward the magnetomotive lever.

In some examples, the handle linkage assembly includes a handle movably mounted to the housing and a handle linkage directly or indirectly engaging the handle for movement therewith.

In some examples, the handle includes a handle base pivotally mounted to the housing, and a handle operating portion extending from the handle base.

In some examples, the handle link has a link base pivotally mounted to the housing.

In some examples, the handle linkage assembly further includes a link having two ends mounted to the handle base of the handle and the first portion of the linkage base of the handle linkage, respectively.

In some examples, the circuit breaker further comprises: the operating mechanism is in transmission connection with the handle linkage assembly and the moving contact assembly through the transmission assembly respectively, the transmission assembly comprises a transmission rod and a transmission plate, the two ends of the transmission rod are mounted on the transmission plate and the second part of the linkage base of the handle linkage assembly respectively, the transmission plate is connected with the moving contact assembly through a first rotating shaft and is mounted on the shell in a pivoting mode, one end of the lock catch is sleeved on the end portion, connected with the transmission rod, of the transmission plate, the other end of the lock catch is mounted on the transmission plate in a pivoting mode through a second rotating shaft, and the jump catch is mounted on the transmission plate in a pivoting mode through a third rotating shaft.

In some examples, a first rotating shaft hole matched with the first rotating shaft is formed in the middle of the transmission plate, a second rotating shaft hole matched with the second rotating shaft is formed in one end of the lock catch, and a third rotating shaft hole matched with the third rotating shaft is formed in the middle of the jump buckle.

In some examples, the first rotating shaft hole, the second rotating shaft and the third rotating shaft are arranged on the transmission plate in a triangular mode, the first rotating shaft hole is arranged below the second rotating shaft and the third rotating shaft, and the first rotating shaft is fixedly arranged on the shell.

In some examples, the movable contact support includes a recess configured to receive the actuator plate and a mounting hole disposed in the recess for mating with the first pivot shaft, the mounting hole being disposed coaxially with the first pivot shaft.

In some examples, the jump buckle is provided with a locking tooth at the end part in snap connection with the lock buckle, and the end part of the lock buckle is correspondingly provided with a locking hook capable of being in lap joint engagement with the locking tooth.

In some examples, an elastic member is disposed between the transmission plate and the housing, and the elastic member biases the transmission plate toward the opening position, so that the transmission plate moves toward the opening position when the trip buckle is connected with the buckle release buckle, thereby moving the movable contact assembly connected with the transmission plate toward the opening position to separate the movable contact from the fixed contact.

In some examples, the circuit breaker further comprises: a thermal release for circuit breaker overload protection, thermal release includes thermal release pull rod and bimetallic strip, the one end fixed connection of thermal release pull rod to the trip, the other end fixed connection of thermal release pull rod to the bimetallic strip, when the circuit breaker takes place to transship when the position department of closing the floodgate, overcurrent flows through the thermal release makes the bimetallic strip is heated and produces bending deformation, drives then the upward movement of thermal release pull rod is in order to drive the trip with hasp release hasp is connected, thereby makes the circuit breaker be in switch over from the position of closing the floodgate to the position of separating the floodgate under the effect of elastic component.

In some examples, the circuit breaker is a plug-in circuit breaker.

On the other hand, the invention further provides a 5G power distribution cabinet which comprises a cabinet body and the circuit breaker located in the cabinet body.

The technical scheme of the invention has the beneficial effects that: the circuit breaker adopts the magnetic pull rod, can play the dual functions of unlocking the operating mechanism and preventing the moving contact from rebounding simultaneously, improves the short-circuit response speed and the safety performance of the circuit breaker, and in addition, the circuit breaker adopts a handle linkage assembly similar to a four-bar linkage mechanism, and has compact structure and convenient operation.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description relate only to some embodiments of the present disclosure and are not limiting to the present disclosure.

Fig. 1 illustrates an overall cross-sectional view of a circuit breaker according to an embodiment of the present disclosure, wherein the circuit breaker is in a closed position;

fig. 2 illustrates an overall cross-sectional view of a circuit breaker according to an embodiment of the present disclosure, wherein the circuit breaker is in an open position;

figure 3 illustrates a partial cross-sectional view of a circuit breaker according to an embodiment of the present disclosure;

figure 4 illustrates another partial cross-sectional view of a circuit breaker according to an embodiment of the present disclosure;

FIG. 5 illustrates a block diagram of a magnetically actuated pull rod of a circuit breaker according to an embodiment of the present disclosure;

figure 6 illustrates a block diagram of a movable contact assembly of a circuit breaker according to an embodiment of the present disclosure;

figure 7 illustrates a partial cross-sectional view of a circuit breaker with the circuit breaker in a closed position according to an embodiment of the present disclosure;

figure 8 illustrates a partial cross-sectional view of a circuit breaker with the circuit breaker in an open position according to an embodiment of the present disclosure;

fig. 9 illustrates a block diagram of a trip buckle of a circuit breaker according to an embodiment of the present disclosure;

figure 10 illustrates yet another partial cross-sectional view of a circuit breaker according to an embodiment of the present disclosure.

List of reference numerals

1 casing

2 handle linkage assembly

21 handle

211 handle base

212 handle operating part

22 handle linkage

221 linkage base

222 first part

223 second part

23 connecting rod

3 operating mechanism

31 jump buckle

311 extension part

312 third rotating shaft hole

313 lock tooth

32 lock catch

321 second rotating shaft hole

322 lock hook

4 magnetic pull rod

41 first end

42 second end

5 first projection

6 second projection

7 moving contact assembly

71 moving contact support

72 moving contact

73 recess

74 mounting hole

8 drive assembly

81 transmission rod

82 drive plate

821 first rotating axle hole

822 second rotary shaft

823 third rotating shaft

9 first rotating shaft

10 spring

11 magnetic release

12 movable iron core

13 coil assembly

14 thermal trip

15 thermal trip pull rod

16 bimetal sheet

17 static contact

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more clear, the embodiments of the present disclosure will be described in detail and completely with reference to the accompanying drawings of specific embodiments of the present disclosure. Like reference symbols in the various drawings indicate like elements. It should be noted that the described embodiments are only some of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

The circuit breaker that this disclosure proposes is preferably used for 5G switch board of 5G basic station, but not the restriction other usage.

Preferably, the circuit breaker is a plug-in circuit breaker and is intended to be inserted into the cabinet of a 5G electrical power distribution cabinet.

Preferably, the circuit breaker is a miniature circuit breaker, for example an elongated profile miniature circuit breaker. Particularly preferably, it is a miniature circuit breaker having dimensions of 40 x 20 x 110 mm.

Preferred embodiments of a circuit breaker according to the present disclosure will be described in detail below with reference to the accompanying drawings. Fig. 1-2 show the circuit breaker in the closed and open positions, respectively, fig. 3 shows a partial cross-sectional view of the circuit breaker, specifically showing the cooperation of the magnetically actuated pull bar and the trip catch, fig. 4 shows another partial cross-sectional view of the circuit breaker, specifically showing the cooperation of the magnetically actuated pull bar and the movable contact support, fig. 5 shows a block diagram of the magnetically actuated pull bar, fig. 6 shows a block diagram of the movable contact assembly, fig. 7-8 show partial cross-sectional views of the circuit breaker in the closed and open positions, respectively, fig. 9 shows a block diagram of the trip catch, fig. 10 shows yet another partial cross-sectional view of the circuit breaker, specifically showing the cooperation of the thermal trip with the trip catch.

Possible embodiments within the scope of the disclosure may have fewer components, have other components not shown in the figures, different components, differently arranged components or differently connected components, etc. than the embodiments shown in the figures. Further, two or more of the components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components, without departing from the concepts of the present disclosure.

Referring to fig. 1, 2 and 6, the circuit breaker proposed by the present disclosure includes a housing 1, a handle linkage assembly 2, an operating mechanism 3, a magnetically-driven pull rod 4 and a movable contact assembly 7. The housing 1 may be an outer housing 1 of the entire circuit breaker, and each of the handle linkage assembly 2, the operating mechanism 3, the magnetomotive pull rod 4 and the movable contact assembly 7 is contained in the housing 1, or partially contained in the housing 1.

The handle linkage assembly 2 is used to switch the circuit breaker between an open position and a closed position. Preferably, the handle linkage assembly 2 includes a handle 21 movably mounted to the housing 1 and a handle linkage 22, the handle linkage 22 directly or indirectly engaging the handle 21 for movement by the handle 21. Specifically, the handle 21 may include a handle base 211 pivotably mounted to the housing 1 and a handle operating portion 212 extending from the handle base 211. The handle operation part 212 may be manually operated, for example, to rotate the handle operation part 212 clockwise at the opening position of the circuit breaker to switch the circuit breaker from the opening position to the closing position, or to rotate the handle operation part 212 counterclockwise at the closing position of the circuit breaker to switch the circuit breaker from the closing position to the opening position, as shown in fig. 1 and 2. Wherein, the main structure of the handle 2 is positioned in the shell 1, but the handle operating part 22 is positioned outside the shell 1 for convenient operation.

Illustratively, the handle link 22 has a link base 221 that is pivotally mounted to the housing 1. The handle linkage assembly 2 may further include a connecting rod 23, and the connecting rod 23 may serve as an intermediate transmission member for the movement of the handle 21 and the handle linkage 22, i.e., both ends of the connecting rod 23 are respectively mounted to the handle base 211 of the handle 21 and the first portion 222 of the linkage base 221 of the handle linkage 22, so that the handle 21 moves the handle linkage 22 through the connecting rod 23. In other words, the handle 21, the handle link 22 and the link 23 form a four-bar linkage-like motion mechanism, as shown in fig. 1, 2, 7 and 8. The present disclosure does not exclude other ways in which the handle 21 may move the handle linkage 22.

In this embodiment, the movable contact assembly 7 includes a movable contact support 71 and a movable contact 72 disposed at one end of the movable contact support 71. The operating mechanism 3 is respectively in transmission connection with the handle linkage component 2 and the moving contact component 7, so that the operating mechanism 3 drives the moving contact 72 of the moving contact component 7 to contact with the fixed contact 17 at the switching-on position or separate from the fixed contact 17 at the switching-off position under the driving of the handle linkage component 2, and the operating mechanism 3 comprises a trip buckle 31 and a lock buckle 32 which are in hasp connection at the switching-on position.

In the present embodiment, a magnetically movable tie rod 4 is movably mounted to the housing 1.

It should be noted that "movably mounted" in this disclosure means movably mounted, i.e., an object can move relative to another object, including but not limited to pivotable, slidable, or retractable, etc.

In the present embodiment, as shown in fig. 5 and 6, a first protrusion 5 is provided between the magnetic pull rod 4 and the trip catch 31, and a second protrusion 6 is provided between the magnetic pull rod 4 and the movable contact assembly 7, when the circuit breaker is short-circuited at the switching-on position, the movable iron core 12 of the magnetic trip 11 of the circuit breaker moves towards the magnetic pull rod 4 and strikes the magnetic pull rod 4, so that the magnetic pull rod 4 abuts against the trip catch 31 through the first protrusion 5 and pushes the trip catch 31 to release the buckle connection with the latch 32, and meanwhile, the magnetic pull rod 4 abuts against and pushes the movable contact assembly 7 through the second protrusion 6 to separate the movable contact 72 from the fixed contact 17 and keep the movable contact assembly 7 from being in contact with the fixed contact 17 again, so that the circuit breaker is switched from the switching-on position to the switching-off position.

Based on above-mentioned characteristic, the circuit breaker that this disclosure provided can play unblock operating device simultaneously and prevent the effect that the moving contact kick-backed, improves the short circuit response speed and the security performance of circuit breaker.

Illustratively, the magnetic release 11 may include a plunger 12 and a coil assembly 13, and the coil assembly 13 is fixedly connected to the housing 1, for example, may be fixedly disposed at a lower portion of the housing 1, as shown in fig. 1 and 2. When a short-circuit current flows through the magnetic release 11, in particular through the coil assembly 13, the short-circuit current momentarily energizes the moving core 12 of the magnetic release 11 to produce a horizontal movement, for example, a horizontal right movement, thereby striking the magnetically movable pull rod 4 to cause a release action.

Illustratively, referring to fig. 1-5, a first end 41 of the magnetically powered pull rod 4 is pivotally mounted to the housing 1, and a second end 42 of the magnetically powered pull rod 4 opposite the first end 41 is configured to contact the plunger 12 of the magnetic release 11. The first end 41 may have a through hole to facilitate the pivotal mounting of the magnetomotive pull rod 4 to the housing 1, the second end 42 may be formed in a U-shape as shown in fig. 5, wherein a notched portion of the U-shape allows the shaft of the plunger 12 to pass through, and the cylindrical end of the plunger 12 may contact both arms of the U-shape. The present disclosure is not so limited and the magnetically powered pull rod 4 may also be movably mounted to the housing 1 by other means, including but not limited to being slidably mounted to the housing 1.

The first protrusion 5 and the second protrusion 6 may have various arrangements. For example, the first protrusion 5 may be provided between the first end 41 and the second end 42 of the magnetomotive tie 4 and extend from the upper surface of the magnetomotive tie 4 toward the jumper 31 to protrude, and the jumper 31 has an extension 311 that contacts the first protrusion 5. For example, the second protrusion 6 may be provided at the other end of the movable contact support 71 opposite to the movable contact 74 and a side surface of the movable contact support 71 extends to protrude toward the magnetomotive pull rod 4. The disclosure is not limited thereto, and the first protrusion 5 and the second protrusion 6 may also have other arrangements, for example, the first protrusion 5 is disposed on the trip buckle 31, the second protrusion 6 is disposed on the magnetomotive pull rod 4, and so on, as long as the function of abutting against and pushing the trip buckle and/or the movable contact support can be achieved.

Illustratively, the circuit breaker may further include: the transmission component 8 and the operating mechanism 3 are respectively in transmission connection with the handle linkage component 2 and the moving contact component 7 through the transmission component 8. Specifically, the transmission assembly 8 may include a transmission rod 81 and a transmission plate 82, two ends of the transmission rod 81 are respectively mounted to the transmission plate 82 and a second portion 223 adjacent to the first portion 222 of the linkage base 221 of the handle linkage 22, the transmission plate 82 is connected to the movable contact assembly 7 through the first rotating shaft 9 and is jointly pivotally mounted on the housing 1, one end of the latch 32 is sleeved on the end of the transmission rod 81 connected to the transmission plate 82, the other end of the latch 32 is pivotally mounted on the transmission plate 82 through the second rotating shaft 822, and the jumper 31 is pivotally mounted on the transmission plate 82 through the third rotating shaft 823.

Further, the middle of the transmission plate 82 may be provided with a first rotation shaft hole 821 matched with the first rotation shaft 9, one end of the latch 32 is provided with a second rotation shaft hole 321 matched with the second rotation shaft 822, and the middle of the jump buckle 31 is provided with a third rotation shaft hole 312 matched with the third rotation shaft 823.

For example, as shown in fig. 1 to 2, the first rotating shaft hole 821, the second rotating shaft 822, and the third rotating shaft 823 are disposed on the transmission plate 82 in a triangular shape, the first rotating shaft hole 821 is disposed below the second rotating shaft 822 and the third rotating shaft 823, and the first rotating shaft 9 is fixedly disposed on the housing 1.

Illustratively, the movable contact support 71 includes a recess 73 and a mounting hole 74 disposed in the recess 73 for cooperating with the first rotating shaft 9, the recess 73 is configured to receive the transmission plate 82 and the mounting hole 74 is disposed coaxially with the first rotating shaft hole 821. In this way, the concave portion 73 of the movable contact support 71 accommodates and is disposed coaxially with the transmission plate 82, so that the transmission plate 82 pivots together with the movable contact support 71. Specifically, the transmission plate 82 may be fixedly connected with the movable contact support 71 through a fitting feature, or may be elastically connected with the movable contact support 71 through an elastic member such as a torsion spring, a leaf spring, or the like.

Illustratively, referring to fig. 1, 2 and 9, the jumper 31 is provided with a locking tooth 313 on an end portion thereof to be snap-coupled with the lock catch 32, and the end portion of the lock catch 32 is correspondingly provided with a lock hook 322 capable of overlapping-engaging with the locking tooth 313. It should be noted that the "snap connection" in the present disclosure is a connection method commonly used in the field of circuit breakers, and is used for snapping two parts with identical shapes together to form a whole. When the buckle is released, the two parts disengage and become two separate parts again.

For example, an elastic member 10 may be disposed between the transmission plate 82 and the housing 1, and the elastic member 10 biases the transmission plate 82 toward the opening position (e.g., horizontally leftward in fig. 1 and 2), so that the transmission plate 82 moves toward the opening position when the trip 31 is released from the latch 32, and thereby the movable contact assembly 7 connected to the transmission plate 82 moves toward the opening position to separate the movable contact 72 from the stationary contact 17, and at this time, the handle linkage assembly 2 is also switched from the position illustrated in fig. 1 to the position illustrated in fig. 2. The elastic member 10 may be, for example, a spring or other elastic elements commonly used in the art, and the disclosure is not limited thereto.

Exemplarily, referring to fig. 10, the circuit breaker proposed by the present disclosure may further include: a thermal trip 14 for circuit breaker overload protection. The thermal release 14 includes a thermal release pull rod 15 and a bimetallic strip 16, one end of the thermal release pull rod 15 is fixedly connected to the trip buckle 31, the other end of the thermal release pull rod 15 is fixedly connected to the bimetallic strip 16, when the circuit breaker is overloaded at the switching-on position, the overload current flows through the thermal release 14 at the moment, so that the bimetallic strip 16 is heated and generates bending deformation, and then the thermal release pull rod 15 is driven to move upwards to drive the trip buckle 31 and the lock catch 32 to release the buckle connection, so that the circuit breaker is switched from the switching-on position to the switching-off position under the action of the elastic member 10.

The closing and opening positions of the circuit breaker will be described below with reference to fig. 1, 2, 7 and 8, wherein fig. 1 and 2 are overall sectional views of the circuit breaker, and fig. 7 and 8 omit some elements of fig. 1 and 2 to show the handle linkage assembly 2, the operating mechanism 3 and the transmission assembly 8.

In fig. 1 and 7, the circuit breaker is in the closing position, in which the movable contact 72 of the movable contact assembly 7 is in contact with the fixed contact 17, the handle 21 is rotated upward to the upper limit position, and the trip 31 and the latch 32 are in snap-fit connection to be locked with each other, so as to keep the circuit breaker components in the closing position. At this time, the following three situations may occur, such that the circuit breaker is switched from the on position to the off position, respectively:

the first condition is as follows: the handle operating portion 212 is manually operated to rotate the handle operating portion 212 counterclockwise at the closing position of the circuit breaker, so that the handle 21 rotates counterclockwise, and the handle linkage 23 is driven to rotate counterclockwise by the link 23. Further, the counterclockwise rotation of the handle linkage 23 will pull the transmission rod 81 to the left, which in turn will drive the transmission plate 82 and the operation mechanism 3 to rotate counterclockwise, so as to switch the circuit breaker from the on position shown in fig. 1 and 7 to the off position shown in fig. 2 and 8.

Case two: the circuit breaker is short-circuited, at this time, a short-circuit current flows through the magnetic release 11, the short-circuit current instantaneously excites the movable iron core 12 of the magnetic release 11 to move (horizontally rightward) towards the magnetic pull rod 4 and impact the magnetic pull rod 4, the magnetic pull rod 4 rotates anticlockwise, the magnetic pull rod 4 abuts against the trip buckle 31 through the first protrusion 5 and pushes the trip buckle 31 to release the hasp connection with the latch 32, meanwhile, the movable contact assembly 7 (specifically, the movable contact support 71) abuts against the second protrusion 6 and pushes the movable contact assembly 7 to rotate anticlockwise, the movable contact 72 is separated from the fixed contact 17 and keeps abutting against the movable contact assembly 7, the movable contact 72 is prevented from rebounding to be in re-contact with the fixed contact 17, and the circuit breaker is switched from the switching-on position shown in fig. 1 and 7 to the switching-off position shown in fig. 2 and 8. Further, the elastic member 10 may also provide an elastic force for switching the handle linkage assembly 2 from the position illustrated in fig. 1 to the position illustrated in fig. 2 during the switching of the circuit breaker from the on position to the off position.

Case three: when the circuit breaker is overloaded, the overcurrent is greater than the rated current, and the overcurrent flows through the thermal release 14, so that the bimetallic strip 16 is heated to generate bending deformation, and then the trip catch 31 and the lock catch 32 are driven to release the buckle connection, so that the circuit breaker is switched from the closing position to the opening position under the action of the elastic element 10.

The present disclosure still relates to a 5G switch board, 5G switch board include the cabinet body and be located the cabinet internal as before the circuit breaker.

In summary, the embodiment of the invention provides a circuit breaker and a 5G power distribution cabinet with the circuit breaker, the circuit breaker adopts a magnetic pull rod, can play double roles of unlocking an operating mechanism and preventing a moving contact from rebounding, improves the short-circuit response speed and the safety performance of the circuit breaker, and is compact in structure and convenient to operate due to the fact that a handle linkage assembly similar to a four-bar linkage mechanism is adopted.

The above description is only for the specific embodiments of the present disclosure, but the scope of the embodiments of the present disclosure is not limited thereto, and any person skilled in the art can easily conceive of the changes, substitutions or combinations within the technical scope of the embodiments of the present disclosure or under the concept of the embodiments of the present disclosure, and all of them should be covered by the scope of the embodiments of the present disclosure.

Claims

1. A circuit breaker comprising:

housing (1);

The handle linkage assembly (2) is used to switch the circuit breaker between the opening position and the closing position;

a moving contact assembly (7), the moving contact assembly (7) comprising a moving contact support (71) and a moving contact (72) arranged at one end of the moving contact support (71);

An operating mechanism (3), the operating mechanism (3) is respectively connected to the handle linkage assembly (2) and the moving contact assembly (7) in a transmission connection, and the operating mechanism (3) is connected to the handle linkage assembly ( 2), the moving contact (72) of the moving contact assembly (7) is driven to contact the static contact (17) at the closing position or separate from the static contact (17) at the opening position. The operating mechanism (3) comprises a snap-connected snap (31) and a lock (32) at the closing position; and

a magnetic pull rod (4), the magnetic pull rod (4) being movably mounted to the housing (1);

Wherein, a first protrusion (5) is provided between the magnetic pull rod (4) and the jumping buckle (31), and between the magnetic pull rod (4) and the moving contact assembly (7) A second protrusion (6) is provided, when a short circuit occurs at the closing position of the circuit breaker, the moving iron core (12) of the magnetic release (11) of the circuit breaker moves toward the magnetic pull rod (4) and Hit the magnetic pull rod (4), so that the magnetic pull rod (4) abuts with the jumping buckle (31) through the first protrusion (5) and pushes the jumping buckle (31) and the jumping buckle (31) The latch (32) releases the snap connection, and at the same time, the magnetic pull rod (4) abuts and pushes the movable contact assembly (7) through the second protrusion (6) to push the movable contact (72). ) is separated from the stationary contact (17) and holds the movable contact assembly (7) to prevent the movable contact (72) from re-contacting with the stationary contact (17), thereby causing the circuit breaker to switch from the closed position to the open position Location.

2. The circuit breaker according to claim 1, wherein the first end (41) of the magnetic pull rod (4) is pivotally mounted to the housing (1), the magnetic pull rod (4) The second end (42) of the ) is configured to be in contact with the moving iron core (12) of the magnetic release (11), and the first protrusion (5) is arranged on the first protrusion (5) of the magnetic pull rod (4). Between one end (41) and the second end (42) and extending from the upper surface of the magnetic pull rod (4) toward the jump buckle (31), and the jump buckle (31) has the same The extension (311) that the first protrusion (5) contacts.

3. The circuit breaker according to claim 1, wherein the second protrusion (6) is provided at the other end of the movable contact bracket (71) and extends from the side of the movable contact bracket (71) The surface extends and protrudes toward the magnetic pull rod (4).

4. The circuit breaker according to claim 1, wherein the handle linkage assembly (2) comprises a handle (21) and a handle linkage (22) movably mounted to the housing (1), the handle linkage (22) A handle linkage (22) directly or indirectly engages the handle (21) to move under the drive of the handle (21).

5. The circuit breaker according to claim 4, wherein the handle (21) comprises a handle base (211) pivotally mounted to the housing (1), and a handle base (211) from the handle base (211) The extended handle operation part (212).

6. The circuit breaker of claim 5, wherein the handle link (22) has a link base (221) pivotally mounted to the housing (1).

7. The circuit breaker according to claim 6, wherein the handle linkage assembly (2) further comprises a connecting rod, two ends of which are respectively mounted to the handle base (211) and the handle base (211) of the handle (21) The first part (222) of the linkage base (221) of the handle linkage (22).

8. The circuit breaker of claim 7, further comprising:

A transmission assembly (8), the operating mechanism (3) is respectively connected to the handle linkage assembly (2) and the movable contact assembly (7) in a transmission through the transmission assembly (8), and the transmission assembly (8) comprises A transmission rod (81) and a transmission plate (82), the two ends of the transmission rod (81) are respectively mounted to the transmission plate (82) and the first part of the linkage base (221) of the handle linkage (22). Two parts (223), the transmission plate (82) is connected with the movable contact assembly (7) through the first rotating shaft (9) and is pivotally mounted on the housing (1) together, and the One end of the lock catch (32) is sleeved on the end of the transmission rod (81) connected with the transmission plate (82), and the other end of the lock catch (32) is pivotable through a second rotating shaft (822). The jumper (31) is pivotally mounted on the transmission plate (82) through a third rotating shaft (823).

9. The circuit breaker according to claim 8, wherein a first shaft hole (821) matched with the first shaft (9) is provided in the middle of the transmission plate (82), and the lock (32) ) is provided with a second rotary shaft hole (321) matched with the second rotary shaft (822), and the middle of the jumper (31) is provided with a third rotary shaft hole matched with the third rotary shaft (823). (312).

10. The circuit breaker according to claim 9, wherein the first rotating shaft hole (821), the second rotating shaft (822) and the third rotating shaft (823) are triangularly arranged on the transmission plate (821). 82), the first shaft hole (821) is arranged below the second shaft (822) and the third shaft (823), and the first shaft (9) is fixedly arranged on the housing (1) on.

11. The circuit breaker according to claim 10, wherein the movable contact bracket (71) comprises a recess (73) and a mounting hole provided in the recess (73) for cooperating with the first rotating shaft (74), the recess (73) is configured to accommodate the transmission plate (82) and the mounting hole (74) is coaxially arranged with the first shaft hole (821).

12. The circuit breaker according to claim 1, wherein a locking tooth (313) is provided on the end of the trip buckle (31) that is snap-connected with the locking buckle (32), and the locking buckle (32) is provided with locking teeth (313). The end of 32) is correspondingly provided with a locking hook (322) capable of overlapping and engaging with the locking teeth (313).

13. The circuit breaker according to claim 1, wherein an elastic member (10) is provided between the transmission plate (82) and the housing (1), and the elastic member (10) drives the transmission The plate (82) is biased in the direction of the opening position, so that the transmission plate (82) moves in the direction of the opening position when the tripping buckle (31) and the locking buckle (32) are released from the hasp connection, thereby The movable contact assembly (7) connected with the transmission plate (82) is driven to move in the direction of the opening position to separate the movable contact (72) from the stationary contact (17).

14. The circuit breaker of claim 13, further comprising:

A thermal release (14) for overload protection of a circuit breaker, the thermal release (14) comprises a thermal release lever (15) and a bimetal (16), and the thermal release lever (15) has a One end is fixedly connected to the trip (31), the other end of the thermal tripping rod (15) is fixedly connected to the bimetal (16), when the circuit breaker is overloaded at the closing position, the overload current Flow through the thermal release (14), so that the bimetal (16) is heated to produce bending deformation, and then drives the thermal release rod (15) to move upward to drive the jumper (31) and the The locking buckle (32) releases the buckle connection, so that the circuit breaker is switched from the closing position to the opening position under the action of the elastic member (10).

15. The circuit breaker of any of claims 1-14, wherein the circuit breaker is a plug-in circuit breaker.

16. A 5G power distribution cabinet, comprising a cabinet body and the circuit breaker according to any one of claims 1-15 located in the cabinet.