CN217507237U

CN217507237U - Tripping mechanism for circuit breaker and circuit breaker

Info

Publication number: CN217507237U
Application number: CN202220226918.8U
Authority: CN
Inventors: 吴永贺
Original assignee: Schneider Electric Industries SAS
Current assignee: Schneider Electric Industries SAS
Priority date: 2022-01-27
Filing date: 2022-01-27
Publication date: 2022-09-27
Anticipated expiration: 2032-01-27

Abstract

The utility model relates to a tripping device and circuit breaker for circuit breaker, include: the base and the trip bar, be provided with blocking part and receiving part between the base with the trip bar, blocking part with the first angle of receiving part staggers in the circumferential direction, work as blocking part with when the receiving part staggers, blocking part prevents the trip bar orientation the further removal of second dropout position, and work as the trip bar rotates so that blocking part with when the receiving part aligns, the receiving part can receive blocking part is in order to allow the trip bar orientation the further removal of second dropout position. The utility model provides a tripping device and circuit breaker can realize stable, reliable, realize closing and separating brake and have reasonable tripping signal level fast.

Description

Tripping mechanism for circuit breaker and circuit breaker

Technical Field

The utility model relates to a tripping device and circuit breaker for circuit breaker.

Background

The opening and closing of the solid-state circuit breaker realizes the safety isolation function of maintenance or electronic failure state by the way that an electronic device (thyristor) is matched with a mechanical contact (such as a moving contact and a static contact), wherein the mechanical contact needs to be pushed by a push rod of an electromagnet to realize opening, while the existing mechanism finishes tripping through two-stage stroke of a tripping rod, when the first-stage stroke of the tripping rod touches a micro switch, a signal is transmitted to an MCU (microprogrammed control unit) and then the thyristor is disconnected, the tripping rod continuously touches a tripping piece downwards and rotates to finish opening, and in the process, a certain time delay is required for the two-stage stroke, otherwise, the situation that the thyristor is not disconnected and the mechanical contact is disconnected first occurs can be caused, so that the mechanical contact generates arc burning contact and contact.

In order to realize a tripping signal level, namely, firstly, the thyristor is disconnected and then the mechanical contact is disconnected, the conventional solid-state circuit breaker performs level management on the pressing time of a tripping rod, so that the tripping design of the circuit breaker is very complex.

Therefore, a tripping mechanism which can stably, reliably and quickly realize switching on and off and has a reasonable tripping signal level and a circuit breaker comprising the tripping mechanism are needed.

SUMMERY OF THE UTILITY MODEL

To the problem and the demand mentioned above, the utility model provides a novel tripping device and circuit breaker for circuit breaker, it has solved above-mentioned problem owing to adopted following technical characteristic to bring other technological effects.

In one aspect, the utility model provides a tripping device for circuit breaker, include: a base connected to a case of the circuit breaker; a trip bar elastically connected to the base by an elastic member, the trip bar being movable relative to the base between an initial position, a first trip position, in which the trip bar is configured to effect electrically controlled opening, and a second trip position, and being rotatable in a circumferential direction, and the elastic member applying a biasing force to the trip bar toward the initial position; in the second tripping position, the tripping lever is configured to effect manual tripping; wherein a blocking portion and a receiving portion are provided between the base and the trip bar, the blocking portion and the receiving portion are staggered by a first angle in a circumferential direction, when the blocking portion is staggered from the receiving portion, the blocking portion blocks the trip bar from further moving toward the second trip position, and when the trip bar is rotated such that the blocking portion is aligned with the receiving portion, the receiving portion can receive the blocking portion to allow the trip bar to further move toward the second trip position.

In some examples, the trip bar includes a switch contact configured to trigger a first microswitch of a circuit breaker in the first trip position to issue a trip signal to a control unit, and the switch contact is configured to trigger a second microswitch of the circuit breaker in the second trip position to indicate that the circuit breaker is in an un-tripped state.

In some examples, the trip bar includes a cylindrical body having a longitudinal axis extending along a length thereof.

In some examples, the stop is a stop tab extending outwardly from the body perpendicular to the longitudinal axis.

In some examples, the base comprises a cylindrical base body and is provided with a circular through hole for receiving an end of a trip bar therethrough, and wherein the receiving portion is a receiving slot opening on a side wall of the base, the receiving slot being circumferentially offset from the blocking tab by the first angle.

In some examples, the first angle ranges from 0 degrees to 180 degrees.

In some examples, the base further comprises a rotation limiting stop part extending outwards perpendicular to the surface of one end of the base, and the position of the rotation limiting stop part corresponds to the blocking bump so as to limit the trip rod to rotate only towards a given direction.

In some examples, in the second tripped position, an end of the trip bar contacts and actuates an on-off mechanism of a circuit breaker such that the on-off mechanism is opened.

In some examples, the trip mechanism further comprises: the mounting panel, the mounting panel is connected to the casing, base fixed mounting is on the mounting panel, the mounting panel is including being used for the installation micro-gap switch's a plurality of mounting holes.

In some examples, an end of the trip bar is provided with a directional indicator for indicating a rotational position of the trip bar.

On the other hand, the utility model provides a circuit breaker, including casing, switching on/off brake mechanism and as before tripping device.

In some examples, the circuit breaker is a solid state circuit breaker.

In some examples, the circuit breaker includes a first microswitch configured to be triggered by the trip bar in the first trip position and a second microswitch configured to be triggered by the trip bar in the initial position.

The technical scheme of the utility model beneficial effect lies in: the utility model provides a tripping device is through setting up stop part and receiving part between base and tripping bar, realizes the tripping signal level, at first breaks off the thyristor then breaks off mechanical contact again promptly, thereby avoids appearing the thyristor and does not break off and thereby mechanical contact breaks off earlier and leads to the condition that mechanical contact produced electric arc burn contact and contact, and tripping structure is simple, can realize stably, reliably, realize closing and separating brake and have reasonable tripping signal level fast. A circuit breaker including the trip mechanism also has corresponding advantages.

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 a circuit breaker trip signal level design schematic in accordance with an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a trip mechanism according to an embodiment of the present disclosure, wherein the movable contact is in a closing position and the trip bar is in an initial position;

fig. 3 is yet another schematic diagram of a trip mechanism according to an embodiment of the present disclosure, wherein the movable contact is in an open position and the trip bar is in a first trip position;

fig. 4 is yet another schematic diagram of a trip mechanism according to an embodiment of the present disclosure, wherein the movable contact is in an open position and the trip bar is in a second trip position;

fig. 5 is a perspective view of a circuit breaker according to an embodiment of the present disclosure, wherein the movable contacts are in a closed position;

FIG. 6 is a perspective view of a base according to an embodiment of the present disclosure;

FIG. 7 illustrates a front view of a trip bar according to an embodiment of the present disclosure;

fig. 8 shows an enlarged partial view of the trip mechanism with the trip bar in an initial position according to an embodiment of the disclosure;

fig. 9 illustrates a close-up view of the trip mechanism with the trip bar in the first trip position according to an embodiment of the present disclosure;

fig. 10 illustrates a close-up view of the trip mechanism with the trip bar in the first trip position and rotated a first angle in accordance with an embodiment of the present disclosure;

fig. 11 illustrates an enlarged partial view of the trip mechanism with the trip bar in the second trip position according to an embodiment of the present disclosure;

fig. 12 illustrates a side cross-sectional view of a circuit breaker with a trip bar in a second tripped position according to an embodiment of the present disclosure.

List of reference numerals

1 moving contact

2 static contact

3 contact support

31 contact arm

4 return spring

5 locking lever

51 fork arm

52 actuator arm

6 take-off fastener

61 first projection

62 second projection

63 groove

7 trip bar

71 main body

72 stop part

73 switch contact

74 stop lug

75 Direction mark

8 base

81 receiving part

82 receiving groove

83 limiting rotation-stopping part

9 mounting plate

91 mounting hole

10 casing

11 first microswitch

12 second microswitch

13 control unit

20 electromagnet

21 electric tripping rod

30 elastic member

D1 first direction

D2 second direction

Third direction D3

A1 longitudinal axis

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 part 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.

It should be noted that the "circuit breaker" referred to in the present disclosure includes, but is not limited to, a solid-state circuit breaker, a medium-low voltage circuit breaker, and the like, and the circuit breaker having both manual opening and electrical opening modes can be applied to the concept proposed in the present disclosure.

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.

The solid-state circuit breaker requires a certain time delay for the two-stage stroke of the trip bar to avoid the situation that the thyristor is not disconnected and the mechanical contact is disconnected first. The embodiment of the disclosure provides a novel tripping mechanism which can stably, reliably and quickly realize switching on and switching off and has a reasonable tripping signal level, and a circuit breaker comprising the tripping mechanism.

Fig. 1 illustrates a circuit breaker trip signal level design schematic in accordance with an embodiment of the present disclosure.

The trip signal of the circuit breaker has two levels as shown in fig. 1, the first level has a higher priority than the second level, and the priority of the level is realized by the design of processing logic and a trip mechanism.

Specifically, the circuit breaker can realize opening through an electric control opening instruction or manual opening, wherein the electric control opening instruction can be realized by pressing an opening button of a remote control screen or a field control screen by an operator, the control unit receives a signal of pressing the opening button and sends an instruction to close the thyristor, then the control unit sends an instruction to drive the electromagnet to open the mechanism comprising the mechanical contact, and in the electric control opening instruction, the first opening of the thyristor and the subsequent opening of the mechanical contact are realized through sequential execution logic of the control unit.

Under the condition of manual brake opening, an operator manually presses a brake opening button, a tripping rod firstly moves from an initial position to a first tripping position and triggers a microswitch, a control unit sends out an instruction to close a thyristor after receiving a triggering signal, and then sends out an instruction to drive an electromagnet to open the mechanism. In addition, the tripping mechanism is provided with a blocking part to block an operator from continuously pressing the tripping rod to the second tripping position, so that the situation that the thyristor is not disconnected but the mechanical contact is disconnected first due to the fact that the operator operates too fast can be prevented, and the situation that the mechanical contact is directly crossed to the second level over the first level is physically prevented.

Secondly, a capacitor electrically connected to the electromagnet is used to release electrical energy to actuate the electromagnet, and when the electromagnet or the capacitor fails, the electromagnet cannot actuate the mechanism to open the brake, and at this time, manual opening is required. In this case, the operator may, for example, rotate the trip bar to stagger the blocking portion so that the trip bar can be pressed on to a second trip position where it can directly actuate the mechanism opening.

Fig. 2-4 schematically illustrate a schematic diagram of a trip mechanism according to an embodiment of the disclosure.

The tripping mechanism is arranged on a switching-on/off mechanism of the circuit breaker. The switching-on and switching-off mechanism of the circuit breaker comprises a moving contact 1, a static contact 2, a contact support 3, a return spring 4, a lock catch rod 5 and a tripping piece 6.

The movable contact 1 is movable between an open position and a closed position. As shown in fig. 2, in the switching-on position, the movable contact 1 and the stationary contact 2 are in contact with each other. As shown in fig. 3 and 4, in the open position, the movable contact 1 and the stationary contact 2 are separated from each other.

The moving contact 1 is supported by a contact support 3, and a contact arm 31 is arranged on the contact support 3, and the contact arm 31 is used for being engaged with the latch lever 5 to lock and release the contact support 3. The contact carrier 3 can be moved in the upward direction in fig. 3 and 4 to perform the opening operation.

As shown in fig. 1 and 2, the return spring 4 acts on the contact support 3 to exert a biasing force F1 between the movable contact 1 and the stationary contact 2 towards the open position. This biasing force F1 causes the movable contact 1 and the stationary contact 2 to be separated from each other when the contact arm 31 is separated from the latch lever 5.

The latch lever 5 is pivotably arranged on the housing 10 of the circuit breaker to pivot between a latched position and a tripped position, and the latch lever 5 is provided with a fork arm 51 acting on the contact arm 31, the fork arm 51 being configured to snap the contact arm 31 into the fork arm 51 when the movable contact 1 is in the switched-on position, with the latch lever 5 being in the latched position.

The trip piece 6 is movably disposed on a housing 10 of the circuit breaker and is structured to abut against the latch lever 5 in the latched position to prevent the latch lever 5 from pivoting toward the tripped position. Latch lever 5 is prevented from pivoting toward the release position by engagement of release member 6 with latch lever 5, thereby maintaining latch lever 5 in the latched position, as shown in fig. 1. In order to facilitate the resetting of the catch lever 5 and the release member 6, the catch lever 5 can be provided with a resetting spring (not shown). As seen in fig. 2-4, the return spring acts on the latch lever 5 to apply a trip return force F2 toward the tripped position, such as in a clockwise direction in fig. 2.

Latch lever 5 may further include an actuating arm 52, actuating arm 52 extending from latch lever 5 away from fork arm 51, actuating arm 52 being configured to abut against trip member 6. The release member 6 may comprise a cylindrical body having a recess 63 formed therein, the recess 63 being positioned to correspond to the actuator arm 52. In the latched position of latch lever 5, actuator arm 52 abuts against the cylindrical surface of release member 6, preventing latch lever 5 from pivoting toward the released position.

When the opening is required, the actuating release member 6 is rotated so that the latch lever 5 is disengaged from the abutment with the release member 6 and the latch lever 5 is pivoted in the first direction D1 (clockwise in fig. 3 and 4) to the release position, the contact arm 31 is separated from the fork arm 51, so that the contact carrier 3 moves the movable contact 1 from the closing position to the opening position under the action of the return spring 4.

The trip mechanism is a mechanism for releasing the engagement state of the lock lever 5 and the trip member 6, and includes a base 8 and a trip lever 7. The base 8 is connected to a housing 10 of the circuit breaker, for example fixedly connected to the housing 10 by screws, or welded to the housing 10.

The trip bar 7 is elastically connected to a base 8 (not shown in fig. 2 to 4) by an elastic member (not shown in fig. 2 to 4), and is movable between an initial position, a first trip position, and a second trip position with respect to the base 8. In fig. 2, the trip lever 7 is in an initial position; in fig. 3, trip lever 7 is in the first trip position; in fig. 3, the trip lever 7 is in the second trip position, the trip lever 7 is movable, for example, in a second direction D2 (up and down direction in the drawing) shown in fig. 2 to 4, and the trip lever 7 is rotatable in the circumferential direction.

Illustratively, the trip lever 7 may have, for example, a substantially cylindrical shape of the body 71, and the "circumferential direction" refers to a circumferential direction along the cylindrical shape of the body 71, and may also be understood as a rotational direction having a longitudinal direction of the trip lever 7 as an axis. Referring to fig. 2 to 4, a blocking portion 72 and a receiving portion 81 are provided between the base 8 and the trip bar 7, the blocking portion 72 and the receiving portion 81 being offset by a first angle in the circumferential direction. When blocking portion 72 is misaligned with receiving portion 81, blocking portion 72 blocks further movement of trip bar 7 toward the second trip position, and when blocking portion 72 is aligned with receiving portion 81, receiving portion 81 receives blocking portion 72 to allow further movement of trip bar 7 toward the second trip position. In the present embodiment, the blocking portion 72 is provided on the trip lever 7 and the receiving portion 81 is provided on the base 8, while the position of the receiving portion 81 is merely exemplarily shown in fig. 2 to 4, and the specific configuration thereof will be described in detail later. However, it should be noted that the arrangement positions of the blocking portion 72 and the receiving portion 81 are not necessarily required to be in the manner shown in fig. 2 to 4, and the positions may be interchanged, for example, the blocking portion 72 is arranged on the base 8 and the receiving portion 81 is arranged on the trip bar 7, as long as the technical effects of the present disclosure can be achieved.

In addition, the circuit breaker further includes a switch and a controller corresponding to the trip operation. For example, in fig. 2, the circuit breaker may comprise at least one microswitch, for example comprising a first microswitch 11 and a second microswitch 12, the second microswitch 12 and the first microswitch 11 being arranged in succession along the second direction D2. The trip bar 7 may include a switch contact 73 configured to make contact with a micro switch.

In the initial position, the switch contact portion 73 of the trip lever 7 contacts the second microswitch 12 to indicate that the circuit breaker is in the non-tripped state, as shown in fig. 2. Specifically, at this time, the circuit breaker is in a closing state, the moving contact 1 is in a closing position, and the moving contact 1 is in contact with the fixed contact 2.

When manual opening is required, the trip lever 7 is actuated to move from the initial position toward the first trip position. During the movement of the trip lever 7 from the initial position toward the first trip position, as shown in fig. 3, the switch contact portion 73 of the trip lever 7 is separated from the second microswitch 12 and contacts the first microswitch 11. Due to the restriction of the blocking portion 72, the trip lever 7 can only move to the first trip position and cannot continue to move downward. At this time, the control unit 13 receives the microswitch signal and drives the electromagnet to open the mechanism.

Specifically, the electromagnet extends out of the push rod, actuates the release member 6, so that the latch lever 5 is disengaged from the release member 6 and the latch lever 5 pivots in the first direction D1 to the release position, the contact arm 31 is separated from the fork arm 51, so that the contact carrier 3 moves the movable contact 1 from the closing position to the opening position under the action of the return spring 4.

When the electromagnet or the capacitor has faults, the electromagnet cannot actuate the mechanism to open the brake, and manual brake opening is needed at the moment. In this case, the operator may first rotate trip lever 7 in third direction D3 a first angle to advance alignment of blocking portion 72 with receiving portion 81 and then depress trip lever 7 to the second trip position, as shown in fig. 4. In the second trip position, the trip lever 7 can directly actuate the actuation trip member 6 to rotate, so as to complete the opening action of the mechanism. Alternatively, the operator can also rotate trip bar 7 in the first trip position, aligning blocking portion 72 with receiving portion 81, to press further to the second trip position, eventually completing the opening.

Illustratively, the first angle is in the range of 0 to 180 degrees, and may be, for example, 90 degrees.

In the viewing angles of fig. 3 and 4, the first direction D1 is clockwise, and further the opposite direction to the first direction D1 is counterclockwise. In fig. 4, the third direction D3 represents a clockwise direction about the longitudinal axis of the trip bar 7. The orientations shown in the figures are merely illustrative and do not limit the scope of the present disclosure.

Alternatively, the control unit 13 may include any suitable processor or combination of processors for processing the trip signal. For example, the control unit 13 may include a Digital Signal Processor (DSP), a Microcontroller (MCU), a Field Programmable Gate Array (FPGA), or other control unit.

Alternatively, the circuit breaker may comprise only one first microswitch 11, without a second microswitch 12, the first microswitch 11 being triggered when the trip bar 7 moves to the first trip position.

Fig. 5-12 illustrate exemplary embodiments of a trip mechanism and a circuit breaker including the trip mechanism according to embodiments of the present disclosure. Specific implementations of trip mechanisms according to embodiments of the present disclosure will be described below in conjunction with fig. 5-12. The undescribed connection relationship can refer to the schematic diagrams of fig. 1 to 4, which are not described herein again.

Fig. 5 shows a perspective view of a circuit breaker including a trip mechanism, when the movable contact 1 is in a switching-on position, and the movable contact 1 is in contact with the fixed contact 2. The contact support 3 shown in fig. 5 supports three movable contacts 1 to be in contact with corresponding three stationary contacts 2. The disclosure is not limited thereto, and those skilled in the art can select the number of the moving contacts and the static contacts according to actual needs.

As shown in fig. 5, the contact carrier 3 is movably connected to the housing 10 of the circuit breaker by a return spring 4. The base 8 of the trip mechanism is connected to the housing 10 and is elastically connected to the trip bar 7 by an elastic member 30. The release member 7 is movable up and down along its longitudinal axis a1 relative to the base 8. In the present embodiment, the elastic member 30 is a spring.

The catch lever 5 and the release element 6 are arranged in parallel in the housing 10 and can be pivoted about their respective longitudinal axes.

The trip bar 7 and the electromagnet 20 are respectively disposed at both sides of the circuit breaker. The electromagnet 20 may comprise an electrically operated trip bar 21, the electromagnet 20 being capable of actuating the movement of the electrically operated trip bar 21. The release member 6 may include a first protrusion 61 and a second protrusion 62. The first projection 61 is provided below the trip lever 7 and is configured to contact the trip lever 7, and the second projection 62 is provided below the electric trip lever 21 and is configured to contact the electric trip lever 21.

Trip bar 7 is capable of actuating first projection 61 in the second trip position, corresponding to a manual trip procedure, and electric trip bar 21 is capable of actuating second projection 62, corresponding to an electrically controlled trip procedure.

The second microswitch 12 and the first microswitch 11 are arranged in sequence in the vertical direction, each having a microcontact. As shown in fig. 5, when the trip lever 7 is at the initial position, the switch contact portion 73 of the trip lever 7 contacts the micro-contact of the second micro-switch 12.

Alternatively, a direction mark 75 may be provided on a surface of one end of the trip lever 7 to indicate a rotational position of the trip lever 7 so that an operator can determine a rotational state of the trip lever 7 at that time.

Fig. 6 specifically shows the base 8 and the mounting plate 9 for mounting the base 8. As shown in fig. 6, the base 8 has a substantially cylindrical base body and has a circular through hole for receiving the end of the trip rod 7 therethrough. The side wall of the base 8 is provided with a receiving groove 82, and the receiving groove 82 is one of the specific implementation manners of the receiving portion 81 of the foregoing embodiment. The number of receiving slots 82 is equal to the number of blocking portions 72. The base 8 is fixedly mounted on a mounting plate 9, for example by screwing or welding. The base 8 may further include a rotation-limiting stopper 83 extending outward perpendicular to a surface of one end of the base 8, the rotation-limiting stopper 83 being positioned to correspond to the stopper 72, i.e., to be offset from the receiving groove 82 by a first angle. The rotation limit stopper 83 is provided to limit the rotation of the trip lever 7 only in a certain direction (for example, the third direction D3), and if the operator wants to rotate the trip lever 7 in the opposite direction, the rotation limit stopper 83 abuts against the stopper 72 to limit the rotation of the trip lever 7, thereby preventing erroneous operation due to erroneous rotation.

The mounting plate 9 is connected to the housing 10 and includes a plurality of mounting holes 91 for mounting the micro-switches. For example, the number of the mounting holes 91 is four, which are arranged in order in the vertical direction. The two mounting holes on the top are used for mounting the second microswitch 12, and the two mounting holes on the bottom are used for mounting the first microswitch 11.

Fig. 7 specifically shows the structure of the trip bar 7. The trip lever 7 includes a main body 71 having a substantially cylindrical shape, one end of which is provided with a direction indicator 75 and the other end of which is configured to contact the first protrusion 61 of the trip member 6. The intermediate portion of the trip lever 7 is also provided with a switch contact portion 73, and the diameter of the switch contact portion 73 is the largest diameter of the entire trip lever 7 so as to be in contact with the micro switch. The lower portion of the switch contact portion 73 is provided with two stopper projections 74, and the stopper projections 74 are provided on both sides of the main body 71 with a 180-degree difference in the circumferential direction. The blocking bump 74 is one of the specific implementations of the blocking portion 72 of the previous embodiment. Alternatively, the height of the blocking projection 74 may be set smaller than the height of the receiving groove 82.

Next, a process of tripping and opening the tripping mechanism in the present embodiment, specifically a process of manually opening the tripping lever 7 in the second tripping position, will be described with reference to fig. 8 to 12. For convenience of description, the elastic member 30 is omitted in fig. 8 to 12 to better show various parts between the trip lever 7 and the base 8.

In fig. 8, the trip lever 7 is in the initial position, and the switch contact portion 73 of the trip lever 7 contacts the second microswitch 12. At this time, the operator presses the trip lever 7 downward, as shown in fig. 9, and the trip lever 7 moves downward, so that the switch contact portion 73 is separated from the second microswitch 12 and contacts the first microswitch 11, so that the control unit 13 gives a command to turn off the thyristor after receiving a trigger signal of the microswitch, and then gives a command to drive the electromagnet 20 to actuate the electric trip lever 21 to contact the second protrusion 62, thereby opening the mechanism. At the same time, the blocking projection 74 contacts the upper surface of the base 8. Due to the restriction of the blocking projection 74, the trip bar 7 can only move to the first trip position and cannot move further downward. Therefore, the manual brake-separating operation is completed, and the tripping level logic is ensured, namely, the thyristor is firstly closed, then the mechanism is separated, and the mechanism is prevented from being disconnected before the thyristor.

When the electromagnet or the capacitor breaks down, the electromagnet cannot actuate the mechanism to open the brake, and manual brake opening is needed at the moment. As shown in fig. 10, the operator rotates the trip lever 7 in the third direction D3 (clockwise about the longitudinal axis a1 in the figure) to align the blocking tab 74 with the receiving slot 82 by a first angle (90 degrees in the present embodiment). Thereafter, trip bar 7 can be depressed further to the second trip position until limit stop 83 contacts switch contact 73 and prevents further downward movement of trip bar 7, as shown in fig. 11.

As better shown in fig. 12, in the second trip position, trip lever 7 can directly contact first projection 61 and actuate trip member 6 to rotate in a counterclockwise direction, so that actuating arm 52 of trip lever 5 enters and is accommodated in recess 63, so that trip lever 5 pivots towards the trip position, contact arm 31 is separated from fork arm 51, so that contact support 3 moves movable contact 1 from the on-position to the off-position under the action of return spring 4, and the opening action of the mechanism is completed.

In another aspect, the disclosed embodiment further provides a circuit breaker, which includes a housing 10, a switching mechanism and a tripping mechanism as described above. The circuit breaker with the tripping mechanism provided by the embodiment of the disclosure can realize reasonable tripping signal levels, and realize stable, reliable and quick switching on and off.

Alternatively, the circuit breaker may be a solid state circuit breaker.

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 trip mechanism for a circuit breaker, comprising:

a base connected to a case of the circuit breaker;

a trip lever elastically connected to the base by an elastic member, the trip lever being movable between an initial position, a first trip position, and a second trip position with respect to the base, and the trip lever being rotatable in a circumferential direction, and the elastic member applying a biasing force to the trip lever toward the initial position,

wherein, in the first trip position, the trip bar is configured to effect an electrically controlled opening; in the second tripping position, the tripping lever is configured to effect manual tripping;

wherein a blocking portion and a receiving portion are provided between the base and the trip bar, the blocking portion and the receiving portion are staggered by a first angle in a circumferential direction, when the blocking portion is staggered from the receiving portion, the blocking portion blocks the trip bar from further moving toward the second trip position, and when the trip bar is rotated such that the blocking portion is aligned with the receiving portion, the receiving portion can receive the blocking portion to allow the trip bar to further move toward the second trip position.

2. The trip mechanism of claim 1, wherein the trip bar includes a switch contact configured to trigger a first microswitch of a circuit breaker in the first trip position to issue a trip signal to a control unit, and the switch contact is configured to trigger a second microswitch of the circuit breaker in the second trip position to indicate the circuit breaker is in an un-tripped state.

3. The trip mechanism of claim 1, wherein the trip bar comprises a cylindrical body having a longitudinal axis extending along a length thereof.

4. The trip mechanism of claim 3, wherein the blocking portion is a blocking tab extending outwardly from the body perpendicular to the longitudinal axis.

5. The trip mechanism of claim 4, wherein the base comprises a cylindrical base body and is provided with a circular through hole for receiving an end of a trip bar therethrough, and wherein the receiving portion is a receiving slot opening in a side wall of the base, the receiving slot being circumferentially offset from the blocking tab by the first angle.

6. The trip mechanism of claim 5, wherein the first angle ranges from 0 degrees to 180 degrees.

7. The trip mechanism of claim 5, wherein the base further comprises a rotation-limiting stop extending outwardly perpendicular to a surface of one end of the base, the rotation-limiting stop being positioned to correspond to the blocking tab to limit rotation of the trip bar in only a given direction.

8. The trip mechanism of claim 5, wherein in the second trip position, an end of the trip bar contacts and actuates an on-off mechanism of a circuit breaker such that the on-off mechanism is opened.

9. The trip mechanism of claim 8, further comprising: a mounting plate, the mounting panel be connected to the casing, base fixed mounting is on the mounting panel, the mounting panel is including being used for the installation the micro-gap switch's of circuit breaker a plurality of mounting holes.

10. The trip mechanism of any of claims 1-9, wherein an end of the trip bar is provided with a directional indicator for indicating a rotational position of the trip bar.

11. A circuit breaker comprising a housing, an on-off mechanism and a trip mechanism as claimed in any one of claims 1 to 10.

12. The circuit breaker of claim 11, wherein the circuit breaker is a solid state circuit breaker.

13. The circuit breaker of claim 11, wherein the circuit breaker includes a first microswitch configured to be triggered by the trip bar in the first trip position and a second microswitch configured to be triggered by the trip bar in the initial position.