CN217444312U

CN217444312U - Circuit breaker

Info

Publication number: CN217444312U
Application number: CN202220607165.5U
Authority: CN
Inventors: 赖森林; 孙冠上; 林聪�; 周燕海
Original assignee: Xiamen Hongfa Electrical Safety and Controls Co Ltd
Current assignee: Xiamen Hongfa Automotive Electronics Co Ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-09-16
Anticipated expiration: 2032-03-18

Abstract

The utility model relates to a circuit breaker, including the movable contact subassembly, still include circuit board and self-checking trigger mechanism, self-checking trigger mechanism includes linkage and the elastic component of making by conductive material, be equipped with the electrically conductive contact of first electrically conductive contact and second on the circuit board, the elastic component has first contact jaw and second contact jaw, first contact jaw is connected with the fixed electricity of first electrically conductive contact, second contact jaw elasticity butt is at the electrically conductive contact of second, the mobile setting of linkage and with the linkage of movable contact subassembly, when the movable contact subassembly carries out its combined floodgate stroke, act on the linkage and then make the linkage promote the second contact jaw and the disconnected with the electrically conductive contact of second. The utility model discloses an every self-checking trigger mechanism will the automatic triggering once at circuit breaker combined floodgate in-process, has greatly improved the reliability of circuit board self-checking function, and self-checking trigger device is direct and moving contact subassembly linkage, consequently can also be used for detecting contact divide-shut brake state, and its instruction function is more directly perceived, and the reliability is better.

Description

Circuit breaker

Technical Field

The utility model relates to a switching apparatus field, concretely relates to self-checking trigger mechanism's of circuit breaker improvement.

Background

An arc fault protection circuit breaker (AFDD), also known as an arc fault detection device, is a novel protection electrical appliance. It can detect arc fault in electric line and cut off circuit before electric fire occurs, so preventing electric fire caused by arc fault.

Arc fault protection circuit breakers are typically equipped with arc fault protection devices to improve electrical safety. The arc fault protection device has a protection function self-checking function so as to ensure that the arc fault protection function of the device is normal. Specifically, when the circuit breaker is used, the self-checking function of the device needs to be manually started at intervals (for example, one month), and whether the circuit board of the device has good or bad functions is judged according to whether the circuit breaker is tripped or not. The disadvantage of this method is that many users often forget to detect the arc fault, and if the arc fault protection function is abnormal, but the users are not aware of the fault and continue to use the circuit breaker, once an electric leakage or an arc fault occurs in a using circuit of the circuit breaker, a fire disaster is easily caused or serious consequences endanger personal safety are easily caused.

SUMMERY OF THE UTILITY MODEL

Therefore, to the above-mentioned problem, the utility model provides a configuration optimization's circuit breaker.

The utility model discloses a following technical scheme realizes:

the utility model provides a circuit breaker, including the moving contact subassembly, the moving contact subassembly has closing stroke and the separating brake stroke that realizes that the circuit breaker switches on and divides absolutely, still includes circuit board and self-checking trigger mechanism, self-checking trigger mechanism is used for triggering the self-checking of circuit board protect function, self-checking trigger mechanism includes linkage and the elastic component of being made by conductive material, be equipped with first conductive contact and second conductive contact on the circuit board, the elastic component has first contact jaw and second contact jaw, wherein the first contact jaw is connected with first conductive contact fixed ground electricity, second contact jaw elasticity butt is in the second conductive contact, linkage movable setting and with the moving contact subassembly linkage, when the moving contact subassembly carries out its closing stroke, can act on the linkage and make the linkage promote the second contact jaw divides with the second conductive contact, to generate a signal for self-checking the circuit board.

Wherein, in one embodiment, the linkage is preferably a rotatable swing arm.

In one embodiment, preferably, the elastic member is a torsion spring, and the first contact end and the second contact end are two torsion arms of the torsion spring.

In one embodiment, preferably, the first contact end is soldered to a first conductive contact of the circuit board, and the circuit board is further provided with a probe pin for elastically abutting against the second contact end, and the probe pin is used as the second conductive contact.

In an embodiment, the soldering device preferably further includes a support shaft, the inner ring of the torsion spring is rotatably sleeved on the support shaft, a positioning groove is formed at a shaft end of the support shaft, and the first contact end is elastically clamped in the positioning groove to realize soldering pre-positioning of the first contact end and the first conductive contact of the circuit board.

In one embodiment, the welding fixture further preferably comprises a supporting shaft and a positioning element, the swing arm and the torsion spring are rotatably sleeved on the supporting shaft, the positioning element is fixedly arranged on one side of the supporting shaft, a clamping groove is formed in the positioning element, and the first contact end elastically abuts against the clamping groove when the torsion spring is sleeved on the supporting shaft, so that the first contact end and the first conductive contact of the circuit board are welded and pre-positioned.

In one embodiment, preferably, the positioning element is further provided with a sliding surface perpendicular to an axis of the torsion spring, the clamping groove is a stepped groove connected to the tail end of the sliding surface, and when the torsion spring is sleeved in the supporting shaft, the first contact end slides into the stepped groove along the sliding surface so as to realize elastic abutting of the first contact end and the stepped groove.

In an embodiment, the test device further preferably includes a partition plate, the moving contact assembly is disposed on one side of the partition plate, the circuit board and the self-test trigger mechanism are disposed on the other side of the partition plate, the swing arm includes a first push rod extending in a direction of a rotation axis of the swing arm, the partition plate is provided with a movable window, and the first push rod penetrates through the movable window to be disposed on a side edge of the moving contact assembly so as to abut against the moving contact assembly.

In one embodiment, preferably, the swing arm further includes a second push rod extending in a direction opposite to the extending direction of the first push rod, and the second push rod is configured to abut against the second contact end.

In one embodiment, the axes of the first push rod and the second push rod are preferably parallel, so that the first push rod and the second push rod are staggered with each other.

In an embodiment, the swing arm further includes a supporting shaft, the swing arm includes an annular sleeve portion, the annular sleeve portion is rotatably sleeved on the supporting shaft, and reinforcing ribs are respectively disposed between the first push rod and the annular sleeve portion and between the second push rod and the annular sleeve portion.

In one embodiment, it is preferable that the closing stroke and the opening stroke of the movable contact assembly are swing strokes, and the movable window is an arc-shaped window matched with the swing stroke of the movable contact assembly.

In one embodiment, the mobile contact assembly and the self-checking trigger mechanism are arranged inside the outer shell and are positioned close to the edge of the outer shell.

The utility model discloses following beneficial effect has: the utility model discloses an every will the automatic triggering once at circuit breaker combined floodgate in-process of self-checking trigger mechanism, has greatly improved the reliability of circuit board self-checking function, and further ground, this mechanism can realize triggering circuit self-checking before the main contact is closed, has improved the security of power consumption greatly. Meanwhile, the self-checking trigger device in the embodiment is directly linked with the moving contact assembly, so that the self-checking trigger device can be used for detecting the opening and closing states of the contact, realizing the conversion between the mechanical state and the electric signal, providing signal input for the opening and closing indication of remote communication, and having better reliability.

Additionally, the utility model discloses a self-checking trigger mechanism assembly is simple and easy, and part is small in quantity, and the cost is lower.

Drawings

Fig. 1 is a perspective view of a circuit breaker in embodiment 1;

fig. 2 is an exploded view of the structure of the circuit breaker in embodiment 1;

FIG. 3 is a schematic view of an N-pole module in example 1;

FIG. 4 is a schematic view of an L-pole module in example 1;

FIG. 5 is a schematic view showing the self-test triggering mechanism of embodiment 1 mounted on the back side of the partition plate;

FIG. 6 is a schematic perspective view (angle one) of the swing arm in embodiment 1;

FIG. 7 is a schematic perspective view (angle two) of the swing arm in embodiment 1;

FIG. 8 is a schematic view showing a movable window and a support shaft provided in the bulkhead in embodiment 1;

FIG. 9 is a schematic perspective view of a contact holder according to embodiment 1;

FIG. 10 is a schematic view showing a spacer provided on a partition plate in embodiment 2;

fig. 11 is a schematic view illustrating the first torsion arm of the torsion spring of embodiment 2 being snapped into the snap groove of the positioning member.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

Example 1:

referring to fig. 1-4, as a preferred embodiment of the present invention, a circuit breaker, specifically an arc fault protection circuit breaker (AFDD), is provided, including an outer casing 6, and an N-pole module 100 and an L-pole module 200 installed inside the outer casing 6, wherein the N-pole module 100 includes a handle 1, an operating mechanism 2, a contact support 3, a moving contact 4, a static contact 5, and the like, the contact support 3 and the moving contact 4 constitute a moving contact assembly, and the moving contact assembly has a trip of opening and closing to realize the contact or separation of the moving contact and the static contact with respect to the static contact 5, thereby realizing the connection or disconnection of the N-pole module 100. Referring to fig. 2, the main structure of the L-pole module 200 is similar to that of the N-pole module 100, the L-pole module 200 also includes a handle 1, an operating mechanism, a contact support, a movable contact, a stationary contact, and the like, and the L-pole module 200 is further provided with an electromagnetic release 14, an overload release 15, an arc extinguishing chamber 16, and the like to implement its basic functions.

The circuit breaker further comprises a circuit board 300, the circuit board 300 and the N pole module 100 are respectively arranged on two sides of the partition 17, the N pole module 100 is located on the front side of the partition 17, the circuit board 300 is located on the back side of the partition 17, a main loop of the L pole module 200 penetrates through the N pole module 100 and is connected to the circuit board 300 in series, and therefore the circuit board 300 can collect and analyze current signals of the L pole module 200 and judge whether fault arcs exist in the circuit.

Referring to fig. 5 to 8, the circuit breaker further includes a self-test triggering mechanism, which is disposed on the back side of the partition 17 and is used for generating a signal for enabling the circuit board 300 to start the self-test function, thereby triggering the self-test of the protection function of the circuit board 300. The self-checking trigger mechanism specifically comprises a swing arm 8 (as a linkage part) and a torsion spring 7 (as an elastic part), wherein a supporting shaft 9 is fixedly arranged on a partition plate 17, the torsion spring 7 is sleeved on the supporting shaft 9 in a positioning mode through an inner ring of the torsion spring, and the swing arm 8 is rotatably sleeved on the supporting shaft 9. In order to facilitate the assembly of the supporting shaft 9 with the torsion spring 7 and the swing arm 8 at the same time, the supporting shaft 9 in this embodiment is a step shaft, and the two shaft sections of the supporting shaft 9 are respectively assembled with the torsion spring 7 and the swing arm 8. The torsion spring 7 is made of a metal conductive material, and includes a first torsion arm 71 (as a first contact end) and a second torsion arm 72 (as a second contact end), and the circuit board 300 is provided with a first conductive contact and a second conductive contact, where the first torsion arm 71 is electrically connected to the first conductive contact, and the second torsion arm 72 elastically abuts against the second conductive contact, for example, as a specific embodiment, the first conductive contact is a solder contact provided on the circuit board 300, and the second conductive contact is a probe 11 provided on the circuit board 300. The swing arm 8 is rotatable and is linked with the moving contact assembly, referring to fig. 9, the contact support 3 is provided with a contact portion 31, and when the moving contact assembly of the N-pole module 100 performs its closing stroke, the contact portion 31 can push the swing arm 8 so that the swing arm 8 pushes the second torsion arm 72 to separate from the second conductive contact, so as to generate a signal for self-checking the circuit board 300. Therefore, in the embodiment, the self-checking trigger mechanism can be automatically triggered once in the switching-on process of the circuit breaker, the reliability of the self-checking function of the circuit board 300 is greatly improved, the safety performance of the circuit breaker is improved, furthermore, the self-checking trigger mechanism can trigger the circuit to perform self-checking before the main contact is closed, and the safety of power utilization is greatly improved. Meanwhile, the self-checking trigger device in the embodiment is directly linked with the moving contact assembly, so that the self-checking trigger device can be used for detecting the opening and closing states of the contact, realizing the conversion between the mechanical state and the electric signal and providing signal input for the opening and closing indication of remote communication, and the self-checking trigger device has a more visual indicating function and better reliability. In addition, the self-checking trigger mechanism of the embodiment is simple and easy to assemble, small in part number and lower in cost.

With reference to fig. 5 to 8, in detail, the swing arm 8 includes an annular sleeve portion 80, the annular sleeve portion 80 is rotatably sleeved on the supporting shaft 9, a first pushing rod 81 is disposed at the end of the swing arm 8 and extends toward the rotation axis direction, a movable window 13 is disposed on the partition 17, and the first pushing rod 81 passes through the movable window 13 to be disposed at the side of the movable contact assembly, so that when the movable contact assembly of the N-pole module 100 performs the closing stroke, the first pushing rod 81 can abut against the movable contact assembly. The swing arm 8 further includes a second push rod 82 extending in a direction opposite to the extending direction of the first push rod 81, the second push rod 82 is configured to abut against the second torsion arm 72, that is, when the first push rod 81 is pushed by the passive contact assembly, the second push rod 82 swings to push against the second torsion arm 72 to separate from the second conductive contact. In this embodiment, preferably, the axes of the first pushing rod 81 and the second pushing rod 82 are parallel, so that the first pushing rod 81 and the second pushing rod 82 are staggered with each other, and the second pushing rod 82 can leave a certain installation space, thereby facilitating installation of other circuit breaker components, such as a testing mechanism, on the back side of the partition 17, and improving the structural compactness. A first reinforcing rib 84 is connected between the first push rod 81 and the annular sleeve portion 80, and a second reinforcing rib 83 is connected between the second push rod 82 and the annular sleeve portion 80, so that the rigidity of the swing arm 8 is increased, and the swing arm is prevented from deforming in the abutting process of the passive contact assembly.

The torsion spring 7 can be replaced by other elastic members, such as a spring plate, in other embodiments, as long as the elastic member has two conductive contact ends to make electrical contact with the first conductive contact and the second conductive contact on the circuit board 300, and the torsion spring 7 is adopted in this embodiment for convenience of manufacturing and installation. In this embodiment, the first torsion arm 71 is soldered to the first conductive contact, and in other embodiments, other fixing and electrical connection manners, such as press-riveting, and screw-locking, may be adopted. In addition, in this embodiment, the closing stroke and the opening stroke of the moving contact assembly are swing strokes, and therefore the movable window 13 is an arc-shaped window matching the swing stroke of the moving contact assembly. The swing arm 8 may be replaced by a linkage of other structure in other embodiments, such as a slider slidably connected to the partition 17, as long as the linkage can receive the pushing force of the movable contact assembly and convert the pushing force into a pushing force acting on the second torsion arm 72. In addition, furthermore, an elastic reset piece such as a torsion spring, a pressure spring, a tension spring and the like can be arranged on the linkage piece so as to ensure that the linkage piece can reset to the right position after the contact separation of the movable contact component and the linkage piece. The swing arm 8 is adopted as a linkage piece in the embodiment, so that the installation and the manufacture are convenient, the movable stroke of the movable contact component can be better matched, and the reliability is improved.

In this embodiment, the shaft end of the supporting shaft 9 is provided with a positioning groove 91, and the first torque arm 71 is elastically clamped in the positioning groove 91 to realize the welding and pre-positioning of the first conductive contact of the first torque arm 71 and the circuit board, so that the circuit breaker is easier to assemble and produce, and the manufacturing manufacturability is improved.

In this embodiment, the moving contact assembly and the self-checking trigger mechanism are disposed inside the outer casing 6 and are both located at a position close to the edge of the outer casing 6, so that the self-checking trigger mechanism is compact in structure, and more mounting space is provided inside the outer casing 6 to mount other circuit breaker components.

Example 2:

the present embodiment provides a circuit breaker, which has a structure similar to that of embodiment 1 and has the same technical effect as that of the same structure, except that the shaft end of the supporting shaft 9A of the present embodiment is not provided with a positioning groove, instead, a positioning member 18 is fixedly disposed at the side of the supporting shaft 9A in the present embodiment, the positioning member 18 is provided with a clamping groove 181, and when the torsion spring 7A is sleeved in the supporting shaft 9A, the first torsion arm 71A elastically abuts against the clamping groove 181, so as to realize the welding prepositioning of the first torsion arm 71A and the first conductive contact of the circuit board. The positioning element 18 is further provided with a sliding surface 182 perpendicular to the axis of the torsion spring 7, and the clamping groove 181 is a stepped groove engaged with the tail end of the sliding surface 182, so that when the torsion spring 7A is sleeved on the supporting shaft 9, the first torsion arm 71A can slide into the stepped groove along the sliding surface 182, the first torsion arm 71 can be elastically abutted against the stepped groove, the installation operation is convenient, and the assembly efficiency is improved.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a circuit breaker, includes the moving contact subassembly, the moving contact subassembly has the closing stroke and the separating brake stroke that realize that the circuit breaker switches on and divides absolutely, its characterized in that: the self-checking trigger mechanism is used for triggering self-checking of a circuit board protection function and comprises a linkage and an elastic piece made of conductive materials, a first conductive contact and a second conductive contact are arranged on the circuit board, the elastic piece is provided with a first contact end and a second contact end, the first contact end is fixedly and electrically connected with the first conductive contact, the second contact end is in elastic abutting connection with the second conductive contact, the linkage is movably arranged and is linked with the moving contact assembly, and when the moving contact assembly performs a closing stroke of the moving contact assembly, the linkage can act on the linkage so that the linkage pushes the second contact end and the second conductive contact to be disconnected, and a signal for enabling the circuit board to be self-checked is generated.

2. The circuit breaker of claim 1, wherein: the linkage is a rotatable swing arm.

3. The circuit breaker of claim 2, wherein: the elastic part is a torsion spring, and the first contact end and the second contact end are two torsion arms of the torsion spring.

4. The circuit breaker of claim 3, wherein: the first contact end is welded on the first conductive contact of the circuit board, and the circuit board is further provided with a probe which is used for being elastically abutted with the second contact end and is used as the second conductive contact.

5. The circuit breaker of claim 4, wherein: the inner ring of the torsion spring is rotatably sleeved on the supporting shaft, a positioning groove is formed in the shaft end of the supporting shaft, and the first contact end is elastically clamped in the positioning groove to realize welding and pre-positioning of the first contact end and the first conductive contact of the circuit board.

6. The circuit breaker of claim 4, wherein: the positioning piece is fixedly arranged on one side of the supporting shaft, a clamping groove is formed in the positioning piece, and the first contact end is elastically abutted against the clamping groove when the torsional spring is sleeved in the supporting shaft so as to realize welding pre-positioning of the first contact end and the first conductive contact of the circuit board.

7. The circuit breaker of claim 6, wherein: the positioning piece is further provided with a sliding surface perpendicular to the axis of the torsion spring, the clamping groove is a stepped groove connected to the tail end of the sliding surface, and when the torsion spring is sleeved into the supporting shaft, the first contact end slides into the stepped groove along the sliding surface so as to realize elastic abutting of the first contact end and the stepped groove.

8. The circuit breaker of claim 2, wherein: the swing arm comprises a first push rod extending towards the direction of the rotation axis of the swing arm, a movable window is arranged on the partition plate, and the first push rod penetrates through the movable window to be arranged on the side edge of the movable contact assembly to abut against the movable contact assembly.

9. The circuit breaker of claim 8, wherein: the swing arm further comprises a second push rod extending in the direction opposite to the extending direction of the first push rod, and the second push rod is used for being abutted to the second contact end.

10. The circuit breaker of claim 9, wherein: the axes of the first push rod and the second push rod are parallel, so that the first push rod and the second push rod are staggered with each other.

11. The circuit breaker of claim 10, wherein: the swing arm comprises an annular sleeving part, the annular sleeving part is rotatably sleeved on the supporting shaft, and reinforcing ribs are arranged between the first push rod and the annular sleeving part and between the second push rod and the annular sleeving part respectively.

12. The circuit breaker of claim 1, wherein: the movable contact assembly and the self-checking trigger mechanism are arranged inside the outer shell and are positioned close to the edge of the outer shell.