CN220439535U - Residual current operated circuit breaker - Google Patents

Abstract

The utility model belongs to the technical field of low-voltage appliances, and discloses a residual current operated circuit breaker which comprises a rotating shaft, a contact, an elastic sheet and a test spring, wherein the contact is connected with the rotating shaft, the elastic sheet is arranged on the rotating shaft and comprises a first supporting part and a second supporting part which are arranged in an included angle, the first supporting part is abutted with the contact, the second supporting part is abutted with the rotating shaft, the test spring comprises a first spring arm, and the first spring arm extends between the first supporting part and the second supporting part. According to the residual current operated circuit breaker provided by the utility model, when the rotating shaft is positioned at the closing position, the peripheral part of the first spring arm is in contact conduction with the second supporting part, the contact area is large, the contact resistance is low, the arc heat generated by the separation of the first spring arm and the second supporting part in the process that the rotating shaft rotates from the closing position to the opening position is effectively reduced, and the test spring is further prevented from being blown by an arc.

Description

Residual current operated circuit breaker

Technical Field

The utility model relates to the technical field of piezoelectric devices, in particular to a residual current operated circuit breaker.

Background

Circuit breakers are important switching devices for electrical power systems, and are capable of switching on and off load power to electrical devices during normal operation and reliably cutting off fault current when the system fails. The residual current operated circuit breaker is a circuit breaker capable of rapidly cutting off a fault power supply in an extremely short time to protect personal safety and electric equipment safety, and generally comprises delay, instantaneous and residual current protection and a test structure aiming at the residual current protection function.

A torsion spring is usually arranged between a contact and a rotating shaft of the residual current operated circuit breaker in the prior art, when in electric leakage operation, a spring arm of the torsion spring and a spring arm of the test spring are disconnected in a point contact mode, the heating value is large, and the test spring is in risk of being blown by an electric arc.

Disclosure of Invention

The utility model aims to provide a residual current operated circuit breaker which can effectively prevent a test spring from being blown by an arc.

To achieve the purpose, the utility model adopts the following technical scheme:

provided is a residual current operated circuit breaker including:

the rotating shaft is rotatably arranged and provided with a closing position and a separating position;

the contact is connected with the rotating shaft;

the elastic piece is arranged on the rotating shaft and comprises a first supporting part and a second supporting part which are arranged at an included angle, the first supporting part is abutted with the contact, and the second supporting part is abutted with the rotating shaft;

the test spring comprises a first spring arm, and the first spring arm extends between the first supporting part and the second supporting part; wherein,

when the rotating shaft is positioned at the closing position, the peripheral part of the first spring arm is in contact conduction with the second supporting part so as to switch on a test loop of the residual current operated circuit breaker;

when the rotating shaft is positioned at the opening position, the first spring arm is separated from the second supporting part.

Optionally, a mounting portion is provided on the rotating shaft, a mounting hole is provided on the mounting portion, the elastic piece is clamped in the mounting hole, and the first end of the contact is penetrated in the mounting hole.

Optionally, the tip of first supporting part is provided with the joint portion towards the contact is buckled, the first end of contact is provided with the joint groove towards one side of elastic sheet, joint portion with the joint groove joint.

Optionally, an abutting portion is disposed at an end of the first supporting portion in an extending manner, the abutting portion abuts against the contact, and the abutting portion protrudes out of the first end of the contact.

Optionally, a plurality of contacts are disposed at intervals along an axial direction of the rotating shaft, each contact is correspondingly provided with one elastic sheet, and the first spring arm extends to a position between the first supporting portion and the second supporting portion of one elastic sheet.

Optionally, the method further comprises:

the test spring is arranged on the bracket;

the conducting plate is fixed on the bracket and is in contact conduction with the first spring arm;

and the lead is used for connecting the test loop, and the first end of the lead is electrically connected with the conductive plate.

Optionally, the test spring further comprises a second spring arm and a spring body, one end of the spring body is connected with the first spring arm, and the other end of the spring body is connected with the second spring arm;

the bracket comprises a first positioning surface and a second positioning surface which are mutually perpendicular; wherein,

the spring body is sleeved on the mounting column;

the second locating surface is provided with a first limiting part and a second limiting part, the first limiting part is used for limiting the position of the first spring arm, and the second limiting part is used for limiting the position of the second spring arm.

Optionally, the first limiting part includes a first limiting protrusion and a second limiting protrusion that are disposed at intervals along the length direction of the second positioning surface, the first limiting protrusion is disposed at a first side edge of the second positioning surface along the length direction, a first limiting groove is formed between the first limiting protrusion and the second positioning surface, and an opening of the first limiting groove faces the first positioning surface; wherein,

the first spring arm is propped against one side of the second limiting protrusion, which is opposite to the first positioning surface, and penetrates through the first limiting groove and extends between the first supporting portion and the second supporting portion.

Optionally, the conductive plate is L-shaped and includes a first plate portion and a second plate portion, the first plate portion is located between the second spacing protrusion and the first positioning surface, and the second plate portion is located between the first spacing protrusion and the second spacing protrusion.

Optionally, the second limiting part is provided with a second limiting groove, an opening of the second limiting groove faces the second positioning surface, and the second spring arm is arranged in the second limiting groove in a penetrating mode.

The beneficial effects are that:

according to the residual current operated circuit breaker provided by the utility model, when the rotating shaft is positioned at the closing position, the peripheral part of the first spring arm is in contact conduction with the second supporting part, so that the contact area is large, the contact resistance is low, the arc heat generated by the separation of the first spring arm and the second supporting part in the process that the rotating shaft rotates from the closing position to the opening position is effectively reduced, and the test spring is further prevented from being blown by an arc.

Drawings

Fig. 1 is an enlarged schematic view of a partial structure of a residual current operated circuit breaker according to the present utility model;

fig. 2 is a schematic diagram of a part of the structure of the residual current operated circuit breaker according to the present utility model;

FIG. 3 is a schematic view of the structure in the mounting hole provided by the utility model;

FIG. 4 is a schematic view of the structure of an elastic sheet according to the present utility model;

fig. 5 is a schematic structural view of a residual current operated circuit breaker according to the present utility model;

fig. 6 is a schematic diagram of a partial structure of a residual current operated circuit breaker at a bracket according to the present utility model.

In the figure:

100. a rotating shaft; 110. a mounting part; 111. a mounting hole; 1111. a support table;

200. a contact; 210. a clamping groove;

300. an elastic sheet; 310. a first support portion; 311. a clamping part; 312. a pushing part; 320. a second supporting part; 330. a bending part;

400. testing a spring; 410. a first spring arm; 411. a first arm portion; 412. a second arm portion; 413. a third arm portion; 420. a second spring arm; 430. a spring body;

510. a first connection terminal; 520. a second connection terminal;

600. a bracket; 610. a first positioning surface; 611. a mounting column; 620. a second positioning surface; 621. a first limit part; 6211. the first limiting protrusion; 6212. the second limiting bulge; 6213. a first limit groove; 622. a second limit part; 6221. the second limit groove;

700. a conductive plate; 710. a first plate portion; 720. a second plate portion;

800. a wire;

900. an electronic component board;

1000. a housing.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

Referring to fig. 1, the present embodiment provides a residual current operated circuit breaker including a rotary shaft 100, a contact 200, an elastic sheet 300, and a test spring 400.

Specifically, the rotating shaft 100 is rotatably disposed, the rotating shaft 100 is connected with the contact 200, the elastic piece 300 is disposed on the rotating shaft 100, the elastic piece 300 includes a first supporting portion 310 and a second supporting portion 320 disposed at an included angle, the first supporting portion 310 abuts against the contact 200, the second supporting portion 320 abuts against the rotating shaft 100, the test spring 400 includes a first spring arm 410, and the first spring arm 410 extends between the first supporting portion 310 and the second supporting portion 320.

The rotating shaft 100 has a closing position and a separating position through rotation. When the rotating shaft 100 is at the closing position, the peripheral part of the first spring arm 410 is in contact conduction with the second supporting part 320 so as to switch on a test loop of the residual current operated circuit breaker; when the rotating shaft 100 is located at the opening position, the first spring arm 410 is separated from the second supporting portion 320.

In this embodiment, when the rotating shaft 100 is located at the closing position, the peripheral portion of the first spring arm 410 contacts and conducts with the second supporting portion 320, compared with the electrical contact in the prior art, the electrical contact has a larger contact area and low contact resistance, so as to effectively reduce the arc heat generated by the separation of the first spring arm 410 and the second supporting portion 320 during the rotation of the rotating shaft 100 from the closing position to the opening position, and further prevent the test spring 400 from being blown by the arc. The first spring arm 410 and the second support portion 320 may be in line contact, for example, a transverse cross section of the first spring arm 410 is circular, and the first spring arm 410 and the second support portion 320 may also be in surface contact, for example, a contact portion of the first spring arm 410 and the second support portion 320 is a plane, which is not limited in this application.

In this embodiment, referring to fig. 2 to 4, the rotating shaft 100 is provided with a mounting portion 110, the mounting portion 110 is provided with a mounting hole 111, the elastic piece 300 is clamped in the mounting hole 111, and the first end of the contact 200 is disposed through the mounting hole 111, so as to facilitate positioning and mounting of the elastic piece 300 and the contact 200.

In one possible embodiment, the end of the first supporting portion 310 is bent towards the contact 200 to be provided with a clamping portion 311, the first end of the contact 200 is provided with a clamping groove 210 towards one side of the elastic piece 300, the clamping portion 311 is clamped with the clamping groove 210, the elastic piece 300 is clamped in the mounting hole 111 through the contact 200, the installation of the elastic piece 300 is facilitated, the structure of the rotating shaft 100 is simplified, and the forming and manufacturing of the rotating shaft 100 are facilitated.

Further, the mounting hole 111 is provided therein with a supporting table 1111, the elastic piece 300 further includes a bending portion 330 disposed between the first supporting portion 310 and the second supporting portion 320, and the bending portion 330 abuts against the supporting table 1111 to further limit the elastic piece 300, and the elastic piece 300 is effectively prevented from being separated from the mounting hole 111 during use by being matched with the clamping slot 210 on the contact 200.

Further, the end of the first supporting portion 310 is extended with a pushing portion 312, the pushing portion 312 abuts against the contact 200, and the pushing portion 312 protrudes from the first end of the contact 200. In this embodiment, the pushing portion 312 is pushed to bend the first supporting portion 310 toward the second supporting portion 320, so that the engaging portion 311 is disengaged from the engaging groove 210, and the elastic piece 300 is conveniently taken out from the mounting hole 111.

In the present embodiment, referring to fig. 3 and 5, a plurality of contacts 200 are disposed at intervals along the axial direction of the rotating shaft 100, each contact 200 is correspondingly provided with one elastic piece 300, and the first spring arm 410 extends between the first supporting portion 310 and the second supporting portion 320 of one elastic piece 300.

Specifically, the rotating shaft 100 is provided with a plurality of mounting portions 110 at intervals along the axial direction, and each mounting portion 110 correspondingly mounts one contact 200 and one elastic piece 300. Preferably, the first spring arm 410 extends between the first supporting portion 310 and the second supporting portion 320 of the elastic piece 300 adjacent thereto, so that the first spring arm 410 has a shorter length, and when the rotating shaft 100 is in the closing position, a larger contact force is provided between the first spring arm 410 and the elastic piece 300, so as to effectively ensure that the contact between the first spring arm 410 and the elastic piece 300 is tight and reliable.

Specifically, each contact 200 is correspondingly connected to a first connection terminal 510, and the first connection terminal 510 is used for connecting an external circuit.

In the present embodiment, referring to fig. 1, 5 and 6, the residual current operated circuit breaker further includes a bracket 600, a conductive plate 700 and a wire 800. The test spring 400 is disposed on the bracket 600, the conductive plate 700 is fixed on the bracket 600, the conductive plate 700 is in contact conduction with the first spring arm 410, the conductive wire 800 is used for connecting a phase line of the electronic component board 900, so as to ensure that the on-off of the phase line is synchronous with the switching on and off of the contact of the residual current operated circuit breaker, and the product inlet and outlet line has an inverse wiring function. And a first end of the wire 800 is electrically connected to the conductive plate 700. The residual current operated circuit breaker contacts are switched on and off, which can be understood as the connection and disconnection of the first spring arm 410 and the second support 320. In this embodiment, the wire 800 is conducted with the first spring arm 410 through the conductive plate 700, so that the connection is more convenient compared with the direct contact connection between the wire 800 and the first spring arm 410, and the connection is stable and reliable because the first spring arm 410 abuts against the conductive plate 700 tightly through the elastic potential energy of the test spring 400.

Specifically, the residual current operated circuit breaker further includes an electronic component board 900, a test circuit is integrated on the electronic component board 900, and the second end of the wire 800 is electrically connected to the electronic component board 900. In this embodiment, the electronic component board 900 is connected with the second connection terminal 520, and the second connection terminal 520 is used for connecting an external circuit, where the electronic component board 900 is in the prior art and is not the focus of the present application, and the detailed description is omitted herein.

Illustratively, the material of the wire 800 includes, but is not limited to, metallic copper.

Illustratively, the material of the conductive plate 700 includes, but is not limited to, metallic copper.

Specifically, the test spring 400 further includes a second spring arm 420 and a spring body 430, one end of the spring body 430 is connected to the first spring arm 410, the other end of the spring body 430 is connected to the second spring arm 420, and the bracket 600 includes a first positioning surface 610 and a second positioning surface 620 that are disposed perpendicular to each other. Wherein, the first positioning surface 610 is provided with a mounting post 611, and the spring body 430 is sleeved on the mounting post 611; the second positioning surface 620 is provided with a first limiting part 621 and a second limiting part 622, the first limiting part 621 is used for limiting the position of the first spring arm 410, and the second limiting part 622 is used for limiting the position of the second spring arm 420, so that the positioning and mounting of the test spring 400 are realized, and the structure is simple, compact, stable and reliable.

In this embodiment, referring to fig. 1 and 6, the first limiting portion 621 includes a first limiting protrusion 6211 and a second limiting protrusion 6212 disposed along a length direction of the second positioning surface 620 at intervals, the first limiting protrusion 6211 is disposed at a first side edge of the second positioning surface 620 along the length direction, a first limiting groove 6213 is formed between the first limiting protrusion 6211 and the second positioning surface 620, and an opening of the first limiting groove 6213 faces the first positioning surface 610. In the present embodiment, the first spring arm 410 abuts against a side of the second limiting protrusion 6212 facing away from the first positioning surface 610, and the first spring arm 410 penetrates the first limiting groove 6213 and extends between the first supporting portion 310 and the second supporting portion 320 of the elastic sheet 300. The direction a in fig. 6 is the length direction of the second positioning surface 620.

Specifically, the first spring arm 410 includes a first arm 411, a second arm 412 and a third arm 413 that are sequentially bent, the first arm 411 is connected to the spring body 430, the second arm 412 is in contact with the conductive plate 700, the third arm 413 abuts against a side of the second limiting protrusion 6212 opposite to the first positioning surface 610, and the third arm 413 penetrates the first limiting groove 6213 and extends between the first supporting portion 310 and the second supporting portion 320.

Illustratively, the first spring arm 410 may be bent in a U-shape.

In the present embodiment, the first limiting protrusion 6211 and the second limiting protrusion 6212 are located at two sides of the third arm 413 to form a clamping effect, so as to ensure that the position of the first spring arm 410 on the second positioning surface 620 is stable and reliable, the design of the first limiting groove 6213 effectively prevents the third arm 413 from tilting to separate from the first limiting protrusion 6211 and the second limiting protrusion 6212, and the second arm 412 is in contact and conduction with the conductive plate 700, so that the contact area is large, and the conduction is stable and reliable. In addition, the second limiting protrusion 6212 corresponds to a fulcrum of the third arm 413, when the rotating shaft 100 is in the closing position, a larger contact force can be further provided between the third arm 413 and the elastic piece 300, so as to ensure that the contact between the third arm 413 and the elastic piece 300 is tight and reliable.

In one possible embodiment, the conductive plate 700 is disposed in contact with the second positioning surface 620. Specifically, the conductive plate 700 is L-shaped, the conductive plate 700 includes a first plate portion 710 and a second plate portion 720, the first plate portion 710 is located between the second limiting protrusion 6212 and the first positioning surface 610, the second plate portion 720 is located between the first limiting protrusion 6211 and the second limiting protrusion 6212, and the conductive plate 700 is positioned and installed by the first limiting protrusion 6211, the second limiting protrusion 6212 and the first positioning surface 610, and the conductive plate 700 is fixed on the second positioning surface 620 under the extrusion of the second arm portion 412, so that the assembly and the disassembly are convenient.

In the present embodiment, as shown in fig. 1 and 6, the second limiting portion 622 is provided with a second limiting groove 6221, the opening of the second limiting groove 6221 faces the second positioning surface 620, and the second spring arm 420 is disposed in the second limiting groove 6221 in a penetrating manner, so as to achieve limiting and convenient assembly and disassembly. Specifically, the second limiting portion 622 is disposed at a second side edge of the second positioning surface 620 along the length direction, and the second limiting protrusion 6212 is located between the first limiting protrusion 6211 and the second limiting portion 622 along the length direction of the second positioning surface 620.

In this embodiment, referring to fig. 5, the residual current operated circuit breaker further includes a housing 1000, and the rotating shaft 100, the contacts 200, the elastic piece 300, the test spring 400, the bracket 600, the conductive plate 700, the wires 800 and the electronic component board 900 are all disposed in the housing 1000, and the rotating shaft 100 is rotatably connected to the housing 1000.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. A residual current operated circuit breaker, comprising:

the rotating shaft (100) is rotatably arranged and provided with a closing position and a separating position;

a contact (200) connected to the rotating shaft (100);

an elastic sheet (300) disposed on the rotating shaft (100), wherein the elastic sheet (300) includes a first supporting portion (310) and a second supporting portion (320) disposed at an included angle, the first supporting portion (310) is abutted against the contact (200), and the second supporting portion (320) is abutted against the rotating shaft (100);

-a test spring (400) comprising a first spring arm (410), the first spring arm (410) extending between the first support (310) and the second support (320); wherein,

when the rotating shaft (100) is positioned at the closing position, the peripheral part of the first spring arm (410) is in contact conduction with the second supporting part (320) so as to switch on a test loop of the residual current operated circuit breaker;

when the rotating shaft (100) is located at the opening position, the first spring arm (410) is separated from the second supporting portion (320).

2. The residual current operated circuit breaker according to claim 1, wherein a mounting portion (110) is provided on the rotating shaft (100), a mounting hole (111) is provided on the mounting portion (110), the elastic piece (300) is clamped in the mounting hole (111), and the first end of the contact (200) is arranged in the mounting hole (111) in a penetrating manner.

3. The residual current operated circuit breaker according to claim 2, characterized in that an end portion of the first supporting portion (310) is provided with a clamping portion (311) bent toward the contact (200), a side of the first end of the contact (200) toward the elastic piece (300) is provided with a clamping groove (210), and the clamping portion (311) is clamped with the clamping groove (210).

4. The residual current operated circuit breaker according to claim 1, characterized in that an end portion of the first support portion (310) is provided with a pushing portion (312) extending, the pushing portion (312) is in contact with the contact (200), and the pushing portion (312) protrudes from the first end of the contact (200).

5. The residual current operated circuit breaker according to claim 1, characterized in that a plurality of contacts (200) are provided at intervals along the axial direction of the rotary shaft (100), each of the contacts (200) is provided with one of the elastic pieces (300) correspondingly, and the first spring arm (410) extends between the first supporting portion (310) and the second supporting portion (320) of one of the elastic pieces (300).

6. The residual current operated circuit breaker according to any one of claims 1-5, further comprising:

a bracket (600), wherein the test spring (400) is arranged on the bracket (600);

a conductive plate (700) fixed on the bracket (600), wherein the conductive plate (700) is in contact conduction with the first spring arm (410);

and a wire (800) for connecting the test loop, wherein a first end of the wire (800) is electrically connected with the conductive plate (700).

7. The residual current operated circuit breaker according to claim 6, characterized in that the test spring (400) further comprises a second spring arm (420) and a spring body (430), one end of the spring body (430) being connected to the first spring arm (410), the other end of the spring body (430) being connected to the second spring arm (420);

the bracket (600) comprises a first positioning surface (610) and a second positioning surface (620) which are mutually perpendicular; wherein,

the first positioning surface (610) is provided with a mounting column (611), and the spring body (430) is sleeved on the mounting column (611);

the second positioning surface (620) is provided with a first limiting part (621) and a second limiting part (622), the first limiting part (621) is used for limiting the position of the first spring arm (410), and the second limiting part (622) is used for limiting the position of the second spring arm (420).

8. The residual current operated circuit breaker according to claim 7, wherein the first limiting portion (621) includes a first limiting protrusion (6211) and a second limiting protrusion (6212) that are disposed at intervals along a length direction of the second positioning surface (620), the first limiting protrusion (6211) is disposed at a first side edge of the second positioning surface (620) along the length direction, a first limiting groove (6213) is formed between the first limiting protrusion (6211) and the second positioning surface (620), and an opening of the first limiting groove (6213) faces the first positioning surface (610); wherein,

the first spring arm (410) is abutted against one side of the second limit protrusion (6212) opposite to the first locating surface (610), and the first spring arm (410) penetrates through the first limit groove (6213) and extends between the first supporting portion (310) and the second supporting portion (320).

9. The residual current operated circuit breaker according to claim 8, characterized in that the conductive plate (700) is L-shaped, comprising a first plate portion (710) and a second plate portion (720), the first plate portion (710) being located between the second limit projection (6212) and the first positioning surface (610), the second plate portion (720) being located between the first limit projection (6211) and the second limit projection (6212).

10. The residual current operated circuit breaker according to claim 7, characterized in that the second limit part (622) is provided with a second limit groove (6221), an opening of the second limit groove (6221) faces the second positioning surface (620), and the second spring arm (420) is penetrated in the second limit groove (6221).