CN108807092B

CN108807092B - Miniature circuit breaker and abrupt moving contact assembly thereof

Info

Publication number: CN108807092B
Application number: CN201710307286.1A
Authority: CN
Inventors: 周思雨
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-05-04
Filing date: 2017-05-04
Publication date: 2024-05-14
Anticipated expiration: 2037-05-04
Also published as: CN108807092A

Abstract

The invention discloses a miniature circuit breaker and a snap-in moving contact assembly thereof, wherein the miniature circuit breaker comprises a shell, an incoming line end, a fixed contact part and a snap-in assembly, and is characterized in that the snap-in moving contact assembly comprises a moving contact piece and a pull-out piece, the moving contact piece is electrically connected with the incoming line end and is rotationally connected to the shell, the miniature circuit breaker comprises a connecting arm and a moving contact part which are connected, and the moving contact part is connected with the snap-in assembly; and the pull-away piece is connected between the connecting arm and the shell to pull the movable contact part away from the fixed contact part, the connecting arm is provided with a segment part stressed by the pull-away piece, and when the switch is closed, the pull-away piece and the segment part act in a segmented manner so as to drive the movable contact part to approach the fixed contact part in a segmented manner and to be attached to each other. The miniature circuit breaker and the abrupt-closing moving contact assembly thereof have the advantages that the moving contact adopts the step type sectional movement, the structure is simple and compact, the use is convenient, and the whole size of the miniature circuit breaker is reduced, so that the miniature circuit breaker can meet the standard requirements.

Description

Miniature circuit breaker and abrupt moving contact assembly thereof

Technical Field

The invention relates to a miniature circuit breaker, in particular to a snap-in moving contact assembly for realizing snap-in by micro energy storage.

Background

Miniature circuit breakers are one of the most widely used terminal protection appliances in the introduction of building electrical terminal distribution devices. The miniature circuit breaker is composed of a switching-on and switching-off mechanism, contacts, a protection device, an arc extinguishing system and the like. The working principle is as follows: overload and short-circuit protection are realized by using a protection device (release) and a current thermal assembly, when the current passing through a coil in the current thermal assembly is larger than a set current value, a movable iron core of the electromagnetic release acts to push a striking rod to strike an operating mechanism, so that the operating mechanism is unlocked, a circuit breaker is opened, and then the circuit is disconnected, thereby realizing overload and short-circuit protection on the circuit. When the circuit fault is discharged, the switching-on and switching-off mechanism is used for switching-on operation, so that the circuit is switched on. At present, the most miniature circuit breakers used in China nowadays are manual opening and closing type, and the circuit can be opened and closed by manually poking the opening and closing mechanism. The manual opening and closing miniature circuit breaker has simple structure and low cost, and does not need extra electric energy, so that opening and closing operation can be performed under the condition of no electric energy, and the manual opening and closing miniature circuit breaker is widely applied to old power grids.

However, with the development of science and technology, intelligent home appliances are increasingly widely used, and as a common miniature circuit breaker for protecting electric appliances, an intelligent control system is also urgently needed to be additionally arranged. In order to match with a common miniature circuit breaker of manual switching-on/off type which is widely used, an intelligent miniature circuit breaker which can be controlled remotely is newly added on one side of the common miniature circuit breaker, and the intelligent miniature circuit breaker drives other common miniature circuit breakers to perform switching-on/off operation according to an input control signal.

In order to further improve the cost control reliability of the electricity consumption information acquisition system, strengthen the quality control of the external circuit breaker of the electric energy meter, ensure that the external dimension of the circuit breaker is strictly regulated in the technical Specification of the external circuit breaker of the electric energy meter formulated for safe and stable operation of the electric power system, wherein the external shape and dimension of the intelligent miniature circuit breaker are consistent with those of the common miniature circuit breaker, so that the consistency of the appearance is ensured, and the terminal equipment of the circuit breaker is convenient to replace on a large scale.

However, the intelligent miniature circuit breaker in the prior art is generally larger than the common miniature circuit breaker in size and inconsistent in appearance due to the addition of the intelligent control device, so that the intelligent miniature circuit breaker cannot be directly used, and the basic equipment for placing the miniature circuit breaker is required to be adaptively modified before use, so that the intelligent miniature circuit breaker is large in early investment and long in construction period, and is not beneficial to the propelling process of the intelligent power grid.

The energy storage of the circuit breaker mainly refers to energy storage during switching on or switching off, and when switching on or switching off, the movable contact of the circuit breaker can be rapidly switched on or switched off, so that the main purpose is to reduce the arc existing time of switching on or switching off and achieve the purpose of rapid arc extinction. In order to improve the opening and closing speed, the prior art generally adopts to increase the energy storage of an opening and closing spring, which necessarily needs to improve the output work of an operating mechanism and the mechanical strength of the whole machine, reduces the technical and economic index, has larger overall dimension, and simultaneously has poor operation experience of operators due to the use of larger power energy storage.

Disclosure of Invention

In the process from opening to closing, the movable contact gradually approaches to the static contact until the movable contact is attached, and the movable contact and the static contact are in two states, namely non-attached and attached. When the movable contact is not attached, the movable contact and the fixed contact are not electrically connected no matter how close the distance is, and the possibility of generating harmful electric arcs is avoided. The invention aims to provide a miniature circuit breaker and a sudden-closing moving contact assembly thereof, wherein the moving contact moves to a static contact in a stepwise manner, and the purpose of quick closing can be achieved by utilizing micro energy storage in the closing process, so that the purpose of quick arc extinction is achieved, and the miniature circuit breaker is simple in structure and convenient to operate.

In order to achieve the above object, the present invention provides a snap-on moving contact assembly, which is disposed in a miniature circuit breaker, the miniature circuit breaker comprising a housing, an incoming line end, a stationary contact part and a snap-on assembly, wherein the snap-on moving contact assembly comprises a moving contact part and a pull-off part, the moving contact part is electrically connected with the incoming line end and is rotatably connected to the housing, the snap-on moving contact assembly comprises a connecting arm and a moving contact part which are connected with each other, and the moving contact part is connected with the snap-on assembly; and the pull-away piece is connected between the connecting arm and the shell to pull the movable contact part away from the fixed contact part, the connecting arm is provided with a segmented part stressed by the pull-away piece, and when the switch is closed, the pull-away piece and the segmented part act in a segmented manner so as to drive the movable contact part to approach the fixed contact part in a segmented manner and to be mutually attached.

In an embodiment of the foregoing protruding moving contact assembly, the segment portion includes a plurality of peak portions, and a valley portion is disposed between two adjacent peak portions.

In an embodiment of the foregoing protruding moving contact assembly, each of the peaks is one of triangle, rectangle, trapezoid or circular arc.

In an embodiment of the foregoing protruding moving contact assembly, the pull-away member is a torsion spring member, and the segment portion is disposed on a surface of the connecting arm facing the stationary contact portion.

In an embodiment of the above-mentioned snap-on moving contact assembly, the pull-off member includes a contact arm, and a first connection arm and a second connection arm connected to two sides of the contact arm, where the contact arm acts on the segment portion, and the first connection arm, the contact arm, and the second connection arm form a frame that drives the connection arm to be far away from the stationary contact portion.

In an embodiment of the above-mentioned snap-action contact assembly, the electrical contact further includes a first arc portion connected to the first arc portion, and a second arc portion connected to the connecting arm, where the second arc portion is rotatable relative to the first arc portion.

In an embodiment of the foregoing protruding moving contact assembly, contact surfaces of the first arc portion and the second arc portion that contact each other have the same radius and circle center.

In an embodiment of the foregoing protruding moving contact assembly, the housing includes a housing supporting portion supporting the first arc portion.

In an embodiment of the foregoing protruding moving contact assembly, the housing supporting portion has an arc supporting surface, a surface of the first arc portion opposite to the arc supporting surface is a first contact surface, and the arc supporting surface and the first contact surface have the same radius.

The miniature circuit breaker comprises a snap-in moving contact assembly, a shell, an incoming line end, a fixed contact part and a snap-in assembly, wherein the snap-in moving contact assembly is the snap-in moving contact assembly.

The miniature circuit breaker and the abrupt-closing moving contact assembly thereof have the beneficial effects that the moving contact adopts the step type sectional movement, so that the miniature circuit breaker is simple and compact in structure and convenient to use, and the integral size of the miniature circuit breaker is reduced, so that the miniature circuit breaker can meet the standard requirements.

The invention will now be described in more detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.

Drawings

Fig. 1 is a schematic structural view of a snap-in contact assembly of the present invention applied to a miniature circuit breaker;

FIG. 2 is a schematic view of a first embodiment of a snap-in contact assembly according to the present invention;

FIG. 3 is an enlarged view of a first embodiment of the snap-in contact assembly of the present invention;

FIG. 4 is an enlarged view of a second embodiment of the snap-action contact assembly of the present invention;

Fig. 5 is an enlarged view of a third embodiment of the snap-action contact assembly of the present invention.

Wherein reference numerals are used to refer to

100. Shell body

110. Shell supporting part

110S arc supporting surface

200. Wire inlet end

300. Stationary contact part

600. Kick assembly

700. Snap-in moving contact assembly

710. Arc-shaped access piece

711. A first arc-shaped part

720. Movable contact piece

721. A second arc-shaped part

722. Connecting arm

7221. Segment part

7221A peak

7221B valley

723. Moving contact part

730. Compacting piece

740. Pulling-off piece

741. Contact arm

742. Second connecting arm

743. First connecting arm

S1, S1' contact surface

S2 contact surface

S3 intrados surface

Detailed Description

The following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, so as to further understand the purpose, the scheme and the effects of the present invention, but not to limit the scope of the appended claims.

The miniature circuit breaker comprises a shell, a wire inlet end, a fixed contact part, a kick assembly and the kick-out movable contact assembly, wherein the kick-out movable contact assembly is connected with the wire inlet end to introduce electricity, and is connected with the kick-out assembly, and the kick-out assembly drives the movable contact part of the kick-out movable contact assembly to be attached to or separated from the fixed contact part so as to achieve the aim of closing or opening a brake.

As shown in fig. 1 and 2, the miniature circuit breaker includes a housing 100, an incoming line end 200, a stationary contact part 300, a snap-through assembly 600, and a snap-in contact assembly 700. The snap-in movable contact assembly 700 of the present invention includes a movable contact member 720 and a pull-out member 740.

The movable contact member 720, which is, for example, a copper conductive member, is electrically connected to the wire inlet terminal 200 and is rotatably connected to the housing 100, and includes a connecting arm 722 and a movable contact portion 723 which are connected, and the movable contact portion 723 is connected to the kick assembly 700.

The pull-away member 740 is connected between the connection arm 722 of the movable contact member 720 and the housing 100, and the pull-away member 740 acts on the connection arm 722 to pull the movable contact member 720 to rotate in a direction away from the stationary contact portion 300, thereby moving the movable contact portion 723 at the end of the movable contact member 720 away from the stationary contact portion 300. That is, if the kick assembly 600 is kicked, the pull-off member 740 will pull the movable contact member 720 to rotate to separate the movable contact portion 723 from the stationary contact portion 300 in the absence of pressure on the movable contact portion 723 by the kick assembly 600. If the kick assembly 600 applies a force to the movable contact portion 723, the pull-off member 740 will also pull the movable contact member 720 to separate the movable contact portion 723 and the stationary contact portion 300 as much as possible.

As shown in fig. 3, the connecting arm 722 has a segment 7221 that is forced by the pull-away member 740, and the pull-away member 740 drives the movable contact member 720 to rotate by forcing the segment 7221 of the connecting arm 722. During closing, as the kick assembly 600 gradually presses the movable contact portion 723, the pull-away member 740 and the segment portion 7221 of the connection arm 722 act in a segmented manner, that is, the movable contact member 720 rotates in a stepwise manner in a first-stage direction toward the stationary contact portion 300, so as to drive the movable contact portion 723 to approach the stationary contact portion 300 in a segmented manner, and until the movable contact portion 723 and the stationary contact portion 300 are attached to each other. It is apparent that since the present application provides the segmented portion 7221, the movable contact portion 723 approaches the stationary contact portion 300 a distance at a time until the movable contact portion 723 is completely fitted to the stationary contact portion 300 during the approach of the nearest distance. In the recent approach, the movable contact 723 is subjected to micro-energy storage, so that the movable contact 723 and the stationary contact 300 are reliably attached to each other.

The segmented portion 7221 includes a plurality of peaks 7221a with valleys 7221b between adjacent two of the peaks 7221a. During closing, the pull-out member 740 passes one peak 7221a and then drops into the valley 7221b and stays until the pressure of the kick assembly 600 driving the movable contact 723 downward is sufficient to pull-out member 740 across the next peak 7221a. The pull-off member 740 rides over the next peak 7221a and then stays in the next valley 7221b. This is repeated until the movable contact portion 723 is attached to the stationary contact portion 300.

As shown in fig. 3 to 5, a plurality of embodiments of the segmented portion 7221 are illustrated. Each peak 7221a may have a triangle, rectangle, trapezoid, or arc shape, so long as a valley 7221b is provided between adjacent peaks 7221a, so that the pull-out member 740 and the contact arm 722 act in a sectional manner during the closing process.

The segmented portion 7221 may be provided at a surface of the connection arm 722 facing the stationary contact portion 300. The pull-away member 740 is, for example, a torsion spring member, and includes a contact arm 741, and a first connecting arm 742 and a second connecting arm 743 connected to two sides of the contact arm 741, where the contact arm 741 acts on the segmented portion 7221 of the movable contact member 720, and the first connecting arm 742, the contact arm 741, and the second connecting arm 743 form a frame body that drives the connecting arm 722 away from the stationary contact portion 300.

Since the contact arm 741 is required to stay in the valley portion 7221b of the segmented portion 7221, in order to avoid the interaction force from being too inclined to escape from the valley portion 7221b, the first connection arm 742 and the second connection arm 743 may be respectively provided with a bend so that the first connection arm 742 and the second connection arm 743 are perpendicular to the connection arm 722 as much as possible.

Referring to fig. 2, the protruding moving contact assembly 700 further includes an arc-shaped access member 710, where the arc-shaped access member 710 is, for example, a copper conductive member, for electrically connecting with the wire inlet terminal 200, and includes a first arc-shaped portion 711, and the first arc-shaped portion 711 is electrically connected with the wire inlet terminal 200. The movable contact member 720 further includes a second arc-shaped portion 721, and the second arc-shaped portion 721 and the movable contact portion 723 are connected to both ends of the connecting arm 722, respectively. The second arc portion 721 is provided corresponding to the first arc portion 711, i.e., the second arc portion 721 is connected to the first arc portion 711 to pass electricity through the second arc portion 721, the connection arm 722, and to the movable contact portion 723 in this order. The second arc part 721 of the movable contact member 720 can rotate relative to the first arc part 711 of the arc-shaped access member 710, and the second arc part 721 of the movable contact member 720 rotates relative to the first arc part 711 of the arc-shaped access member 710 to drive the movable contact part 723 at the other end of the movable contact member 720 to be attached to or detached from the stationary contact part 300.

The contact surfaces S1, S1' of the first arc-shaped portion 711 of the arc-shaped access member 710 and the second arc-shaped portion 721 of the movable contact member 720, which are in contact with each other, have the same radius and center of circle, so that the first arc-shaped portion 711 can rotate stably and reliably relative to the second arc-shaped portion 721.

The housing 100 includes a housing supporting portion 110 supporting a first arc portion 711 of the arc-shaped access member 710, the housing supporting portion 110 has an arc-shaped supporting surface 110S, and similarly, a contact surface S2 of the first arc portion 711 of the arc-shaped access member 710, which contacts the arc-shaped supporting surface 110S of the housing 100, has the same radius and center as the arc-shaped supporting surface 110S, so as to ensure that the arc-shaped supporting surface 110S of the housing 100 stably supports the first arc-shaped portion 711.

The snap-in movable contact assembly 700 of the present invention further includes a pressing member 730, where the pressing member 730 presses the second arc portion 721 of the movable contact member 720 to the first arc portion 711 of the arc-shaped access member 710, so as to fix the relative position of the second arc portion 721 and the first arc portion 711, and not to affect the rotation of the second arc portion 721 relative to the first arc portion 711.

The pressing member 720 may be connected between the second arc portion 721 of the movable contact member 720 and the housing 100. For example, one end of the pressing member 730 is fixed to the housing 100, and the other end abuts against the intrados surface S3 of the second curved portion 721.

The kick moving contact assembly can be arranged in the miniature circuit breaker, so that the whole size of the miniature circuit breaker is effectively reduced, and the connection is reliable. Of course, the snap-action contact assembly of the present invention is not limited to miniature circuit breakers, but may be provided in other switches, particularly switches having a desired external dimension.

Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A snap-in moving contact assembly disposed within a miniature circuit breaker, the miniature circuit breaker comprising a housing, an incoming line end, a stationary contact portion, and a snap-in assembly, the snap-in moving contact assembly comprising:

The movable contact piece is electrically connected with the wire inlet end and is rotationally connected to the shell and comprises a connecting arm and a movable contact part which are connected, and the movable contact part is connected with the kick component;

The arc-shaped access piece comprises a first arc-shaped part electrically connected with the wire inlet end;

And the pull-away piece is connected between the connecting arm and the shell to pull the movable contact part away from the fixed contact part, the connecting arm is provided with a segmented part stressed by the pull-away piece, and when the switch is closed, the pull-away piece and the segmented part act in a segmented manner so as to drive the movable contact part to approach the fixed contact part in a segmented manner and to be mutually attached.

2. The snap-in contact assembly of claim 1, wherein the segmented portion comprises a plurality of peaks with valleys between adjacent two of the peaks.

3. The snap-in contact assembly of claim 2, wherein each of the peaks is one of triangular, rectangular, trapezoidal, or circular arc.

4. The snap-in contact assembly of claim 1, wherein the pull-away member is a torsion spring member and the segmented portion is disposed on a surface of the connecting arm facing the stationary contact portion.

5. The snap-in contact assembly of claim 1, wherein the pull-out member comprises a contact arm and first and second connecting arms connected to opposite sides of the contact arm, the contact arm acting on the segmented portion, the first, contact and second connecting arms comprising a frame that moves the connecting arms away from the stationary contact portion.

6. The snap-in movable contact assembly of claim 1, wherein the movable contact piece further comprises a second arcuate portion connected to the connecting arm, the second arcuate portion being rotatable relative to the first arcuate portion.

7. The snap contact assembly of claim 6, wherein the contact surfaces of the first and second arcuate portions that contact each other have the same radius and center.

8. The snap contact assembly of claim 6, wherein the housing comprises a housing support portion that supports the first arcuate portion.

9. The snap-in contact assembly of claim 8, wherein the housing support portion has an arcuate support surface, the surface of the first arcuate portion opposite the arcuate support surface being a first contact surface, the arcuate support surface having the same radius as the first contact surface.

10. A miniature circuit breaker comprising a snap-in movable contact assembly, a housing, an in-line end, a stationary contact portion, and a snap-in assembly, wherein the snap-in movable contact assembly is the snap-in movable contact assembly of any one of claims 1 to 9.