CN216389222U

CN216389222U - Circuit breaker

Info

Publication number: CN216389222U
Application number: CN202123155748.3U
Authority: CN
Inventors: 张慎虎; 徐江宁; 陈鸣
Original assignee: Ningbo Gongniu Low Voltage Electric Co Ltd
Current assignee: Ningbo Gongniu Low Voltage Electric Co Ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-04-26
Anticipated expiration: 2031-12-14

Abstract

The application relates to a circuit breaker, and belongs to the technical field of testing. The circuit breaker comprises a shell, a mutual inductor, a circuit board and a testing mechanism, wherein the testing mechanism comprises a testing button, a testing torsion spring, a first testing wire and a second testing wire; the testing button is slidably arranged in the shell, the testing torsion spring is fixed in the shell, the first supporting arm abuts against the inner wall of the shell, and the second supporting arm abuts against the bottom of the testing button; one end of the first test wire is electrically connected with the test torsion spring, the other end of the first test wire is connected with the circuit board, one end of the second test wire is fixed on the shell, the other end of the second test wire is connected with the circuit board, and one of the first test wire and the second test wire penetrates through the mutual inductor; when the test button is in a pressed state, the test torsion spring is electrically connected with the second test line, and when the test button is in a non-pressed state, the test torsion spring is disconnected with the second test line. This application adopts the torsional spring to realize the closure and the disconnection of accredited testing organization place circuit, and the elasticity of torsional spring is good, is difficult for taking place permanent deformation, can prolong accredited testing organization's life.

Description

Circuit breaker

Technical Field

The application relates to the technical field of testing, in particular to a circuit breaker.

Background

Circuit breakers are switching devices necessary for power distribution circuits to provide protection and control functions in electrical power systems. For example, when the circuit where the circuit breaker is located is overloaded, leaked or short-circuited, the circuit breaker can detect that the current of the circuit where the circuit breaker is located is too large, and automatically break the circuit to avoid accidents caused by the too large current.

In order to periodically check that the circuit breaker can normally operate, the circuit breaker generally includes a test mechanism by which a large current is generated to determine whether the circuit breaker can detect the large current and to perform automatic circuit breaking.

But the current test mechanism of circuit breaker has the short service life's problem.

SUMMERY OF THE UTILITY MODEL

The present application provides a circuit breaker capable of overcoming the problems existing in the related art. The technical scheme is as follows:

according to the application, a circuit breaker is provided, the circuit breaker comprises a shell, a mutual inductor, a circuit board and a testing mechanism, wherein the testing mechanism comprises a testing button, a testing torsion spring, a first testing wire and a second testing wire;

the testing button is slidably mounted in the shell, the testing torsion spring is fixed in the shell, a first support arm of the testing torsion spring abuts against the inner wall of the shell, and a second support arm of the testing torsion spring abuts against the bottom of the testing button;

one end of the first test wire is electrically connected with the test torsion spring, the other end of the first test wire is connected into the circuit board, one end of the second test wire is fixed on the shell, the other end of the second test wire is connected into the circuit board, and one of the first test wire and the second test wire penetrates through the mutual inductor;

when the test button is in a pressing state, the test torsion spring is electrically connected with the second test wire, and when the test button is in a non-pressing state, the test torsion spring is electrically disconnected with the second test wire.

In one possible embodiment, the first test line includes a first pin and a first conductive line;

the first contact pin is fixedly connected with the first lead, the first contact pin is electrically connected with the test torsion spring, and the first lead is connected into the circuit board.

In a possible embodiment, the inner wall of the shell is provided with a first cylinder, and the first cylinder is provided with a first strip-shaped notch along the length direction;

the test torsion spring is sleeved outside the first column body, and the first contact pin is in interference fit with the first strip-shaped notch and is in close contact with the test torsion spring.

In one possible embodiment, the first pin is a metal tube formed by punching and curling a metal sheet;

the first contact pin and the first lead are fixedly connected in a riveting mode.

In one possible embodiment, the second test line includes a second pin and a second conductive line;

the second contact pin is fixedly connected with the second lead, the second contact pin is fixed on the shell, and the second lead is connected into the circuit board;

when the test button is in a pressing state, the second support arm of the test torsion spring is electrically connected with the second contact pin, and when the test button is in a non-pressing state, the second support arm of the test torsion spring is electrically disconnected with the second contact pin.

In a possible embodiment, the circuit breaker comprises a main spring for opening an idle switch of the circuit breaker;

the main spring is fixed on the shell, and a first support arm of the main spring is fixed below a second support arm of the test torsion spring, which is far away from the test button;

the second contact pin is fixed on the shell through the main spring and is electrically connected with the main spring;

when the test button is in a pressed state, the second support arm of the test torsion spring is in contact with the first support arm of the main spring, and when the test button is in a non-pressed state, the second support arm of the test torsion spring is separated from the first support arm of the main spring.

In a possible embodiment, the inner wall of the shell is provided with a second column body, and the second column body is provided with a second strip-shaped notch along the length direction;

the main spring is sleeved outside the second cylinder, and the second contact pin is in interference fit with the second strip-shaped notch and is in close contact with the main spring.

In a possible embodiment, the inner wall of the housing has a second latching groove below the second arm of the test torsion spring, which is remote from the test button, and the first arm of the main spring latches in the second latching groove.

In one possible embodiment, the second pin is a metal tube formed by punching and curling a metal sheet;

the second contact pin and the second lead are fixedly connected in a riveting mode.

In a possible embodiment, the bottom of the test button has a first slot, and the second arm of the test torsion spring is clamped in the first slot.

In this application embodiment, this test mechanism of circuit breaker can supply the user to periodically detect this circuit breaker whether can also normally work to ensure that the circuit breaker can be in the circuit to the guard action. This accredited testing organization of circuit breaker adopts the torsional spring to realize the closure and the disconnection of accredited testing organization place circuit, and the elasticity of torsional spring is better, is difficult to take place permanent deformation, can prolong accredited testing organization's life.

Moreover, the testing mechanism comprises a testing button for user operation, a first testing line and a second testing line which form a circuit, and a testing torsion spring which enables the first testing line to be connected and disconnected.

In addition, the first test wire of the test mechanism is arranged, and the first contact pin of the first test wire is in interference fit with the test torsion spring, so that the fixed connection and the electric connection are realized. In the installation of the second test wire of the test mechanism, with the help of the main spring of the circuit breaker, the second contact pin of the second test wire is in interference fit with the main spring, so that the fixed connection and the electric connection are realized. The installation mode of the first test wire and the second test wire is reliable and stable in fixing and electric connection, and is simple and convenient.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. In the drawings:

fig. 1 is a schematic diagram of a circuit breaker according to an embodiment;

fig. 2 is a schematic diagram illustrating a circuit breaker with a test button in a non-depressed state according to an embodiment;

fig. 3 is a schematic diagram illustrating a circuit breaker with a test button in a pressed state according to an embodiment;

FIG. 4 is a schematic structural diagram of a testing mechanism of a circuit breaker according to an embodiment;

figure 5 is a schematic diagram illustrating a test button and test torsion spring cooperation of a circuit breaker, according to an embodiment;

fig. 6 is a schematic structural diagram of a first test line and a second test line of a circuit breaker according to an embodiment;

fig. 7 is a schematic structural diagram of a housing of a circuit breaker according to an embodiment;

FIG. 8 is an enlarged partial schematic view shown in phantom in FIG. 7, according to an embodiment;

fig. 9 is a schematic structural diagram of a first test line of a circuit breaker according to an embodiment.

Illustration of the drawings:

1. a housing; 11. a first column; 111. a first bar-shaped notch; 12. a second cylinder; 121. a second strip-shaped notch; 13. and a second card slot.

2. A transformer; 3. a circuit board; 5. an air switch; 6. a main spring; 7. a release; 71. a telescopic rod; 8. a transmission member; 81. a first leg; 82. a second leg; 83. a third leg; 84. a return spring; 9. a live line; 10. a zero line.

4. A testing mechanism; 41. a test button; 42. testing the torsion spring; 43. a first test line; 44. a second test line; 411. a first card slot; 431. a first pin; 432. a first conductive line; 441. a second pin; 442. a second conductive line.

a. A first support arm; b. a second support arm.

With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The embodiment of the application provides a circuit breaker, which is a necessary switching device in a distribution circuit and is generally arranged on a main line of the distribution circuit. When the distribution circuit at the breaker is overloaded, leaked electricity or short-circuited, the current value on the trunk circuit is overlarge, and at the moment, the breaker can detect that the current value on the trunk circuit is overlarge and can automatically cut off the distribution circuit to avoid causing fire.

Since the circuit breaker plays an important role in safety power utilization, a user is required to periodically detect whether the circuit breaker can still work normally. The circuit breaker normally works, namely, the circuit breaker can automatically cut off under high current. Therefore, the circuit breaker needs to include a testing mechanism, and a user can periodically detect whether the circuit breaker can still work normally through the testing mechanism.

Before describing the test mechanism of the circuit breaker, a structure of the circuit breaker for realizing automatic cut-off and a process for realizing automatic cut-off are described first.

Fig. 1 is a schematic view of the overall structure of the circuit breaker, and fig. 2 and 3 are schematic views of a housing 1 of the circuit breaker with a part removed.

As shown in fig. 2, the circuit breaker includes a case 1, a transformer 2, a circuit board 3, a dry switch 5, a trip unit 7, a main spring 6, and a transmission member 8. The housing 1 has a button hole, the idle switch 5 can be installed in the button hole in a clearance fit manner and can slide relative to the housing 1, when the idle switch 5 is pressed, the idle switch 5 is in a pressed state, and then, a circuit where the circuit breaker is located is in a conducting state, and when the idle switch 5 is not pressed, the idle switch 5 is in an unlocked state or a non-pressed state, and then, the circuit where the circuit breaker is located is in a disconnected state.

As shown in fig. 2, a main spring 6, a release 7 and a transmission member 8 are mounted in the housing 1 for urging the air switch 5 to be maintained in a pressed state and to be switched to a non-pressed state. The main spring 6 is a torsion spring and is fixed on the inner wall of the housing 1, wherein one arm, for example, the second arm b, of the main spring 6 is located at the bottom of the idle switch 5 and is used for jacking the idle switch 5 to make the idle switch 5 in a non-pressing state.

As shown in fig. 2, the transmission member 8 is rotatably mounted to the housing 1 so as to be capable of rotational movement relative to the housing 1. The position of the first leg 81 of the transmission member 8 is opposite to the position of the telescopic rod 71 of the trip unit 7, the second leg 82 of the transmission member 8 is lapped on the second arm b of the main spring 6, and the third leg 83 of the transmission member 8 is matched with the idle switch 5, for example, the third leg 83 can be buckled with the idle switch 5 or can be separated from the idle switch 5.

Thus, when the telescopic rod 71 of the release 7 is in the retracted state, as shown in fig. 2, the third leg 83 of the transmission member 8 and the idle switch 5 are engaged, so that the idle switch 5 is maintained in the pressed state. At this time, the circuit in which the breaker is located is in a conducting state.

When the telescopic rod 71 of the trip unit 7 is in the extended state, as shown in fig. 3, the telescopic rod 71 pushes the transmission member 8 to rotate counterclockwise, so that the third leg 83 of the transmission member 8 is disengaged from the idle switch 5, the idle switch 5 is jacked up under the elastic force of the second arm b of the main spring 6, and the pressed state is switched to the non-pressed state, and at this time, the circuit of the circuit breaker is in the disconnected state.

In one example, the extension and retraction of the telescoping rod 71 of the trip unit 7 can be controlled by the circuit board 3. For example, a chip is mounted on the circuit board 3, and the chip can control the operation of the trip unit 7 by detecting the magnitude of the current supplied by the transformer 2.

For example, when the chip on the circuit board 3 detects that the current delivered by the transformer 2 exceeds a preset current threshold, the extension rod 71 of the trip unit 7 is controlled to extend. And when the chip on the circuit board 3 detects that the current transmitted by the transformer 2 does not exceed the preset current threshold, the telescopic rod 71 of the release 7 is controlled to be in a contracted state.

In one example, the current in the transformer 2 may be excited by the live 9 and neutral 10 wires passing through the transformer 2. With continued reference to figure 2, the live and neutral conductors 9, 10 that are connected into the circuit breaker, both pass through the transformer 2 and are connected into the circuit board 3. One of the live wire 9 and the zero wire 10 is connected with a movable contact of the idle switch 5, and the other is connected with a fixed contact of the idle switch 5, so that when the idle switch 5 is closed, a circuit where the circuit breaker is located forms a closed loop.

The transformer 2 may also be called an instrument transformer, which is a general name of a current transformer and a voltage transformer, and mainly has a function of converting high voltage or large current into standard low voltage or standard small current in proportion. For example, the transformer 2 of the circuit breaker may be a current transformer capable of converting a large current into a small current in an equal proportion and inputting the small current into the circuit board 3.

Therefore, when the circuit of the circuit breaker is in a normal state, the directions of the currents flowing on the live wire 9 and the zero wire 10 are opposite, and the currents are equal in magnitude, so that the mutual inductor 2 cannot be excited to transmit large current to the circuit board 3, and at the moment, the telescopic rod 71 of the release 7 is in a contraction state.

When the circuit of the circuit breaker is in a leakage state, the current flowing on the live wire 9 and the zero wire 10 is not equal in magnitude, and then the difference between the currents on the live wire 9 and the zero wire 10 can excite the mutual inductor 2 to transmit large current to the circuit board 3. When the chip on the circuit board 3 detects a large current, the telescopic rod 71 of the release 7 is controlled to extend.

When the circuit of the breaker returns to normal, the user can press the idle switch 5 to make the circuit of the breaker in a conducting state. For example, when the user presses the idle switch 5, the second arm b of the main spring 6 is pressed by the bottom of the idle switch 5, the transmission member 8 is returned to the initial position by the return spring 84, the third leg 83 of the transmission member 8 is engaged with the idle switch 5, the idle switch 5 is maintained in the pressed state, and the circuit in which the circuit breaker is located is in the on state.

The above is the structure of the circuit breaker for realizing automatic cut-off and the description of the process for realizing automatic cut-off, and the following will describe the testing mechanism of the circuit breaker.

The testing mechanism of the circuit breaker can simulate the live wire 9 and the zero line 10 to excite the mutual inductor 2 to generate large current, namely, the testing mechanism can excite the mutual inductor 2 to generate large current, so that when the circuit board 3 detects the large current, the telescopic rod 71 of the control release 7 extends out, and the air switch 5 is switched to a non-pressing state.

Fig. 4 is a schematic structural diagram of the testing mechanism. The testing mechanism 4 includes a test button 41, a test torsion spring 42, a first test wire 43, and a second test wire 44. As shown in fig. 2, the housing 1 has a button hole, the test button 41 is mounted in the button hole in a clearance fit manner and is capable of sliding movement relative to the housing 1, when the test button 41 is pressed, the test button 41 is in a pressed state, and then the circuit of the test mechanism is in an on state, and when the test button 41 is not pressed, the test button 41 is in a non-pressed state, and then the circuit of the test mechanism is in an off state.

As shown in fig. 2, the test torsion spring 42 is fixed in the housing 1, and the first arm a of the test torsion spring 42 abuts against the inner wall of the housing 1, for example, the first arm a of the test torsion spring 42 abuts against the inner surface of the side wall of the housing 1, so as to achieve a fixed connection with the housing 1. As shown in fig. 2, the second arm b of the test torsion spring 42 abuts against the bottom of the test button 41. For example, as shown in fig. 5, the bottom of the test button 41 has a first slot 411, and the second arm b of the test torsion spring 42 is clamped in the first slot 411, for example, the second arm b of the test torsion spring 42 passes through the first slot 411 and is clamped with the first slot 411. This can stabilize the second arm 4 of the test torsion spring 42 at the bottom of the test button 41 for mounting stability.

As shown in fig. 2 and referring to fig. 3, during the switching of the test button 41 from the non-pressed state to the pressed state, the second arm b of the test torsion spring 42 moves downward along the pressing direction, i.e., moves away from the test button 41.

The above is an explanation about the test button 41 and the test torsion spring 42 of the test mechanism, and the first test line 43 and the second test line 44 of the test mechanism will be explained below.

As shown in fig. 2, one end of the first test wire 43 is electrically connected to the test torsion spring 42 having conductivity, and the other end is connected to the circuit board 3. One end of the second test wire 44 is fixed to the housing 1, the other end is connected to the circuit board 3, and one of the first test wire 43 and the second test wire 44 passes through the transformer 2.

When the user presses the test button 41, the test button 41 is in a pressed state, the second arm b of the test torsion spring 42 moves downward and can be electrically connected with the second test wire 44, and the circuit of the test mechanism is in a closed state. When the user is not pressing the test button 41, the test button 41 is switched to the non-pressed state, the second arm b of the test torsion spring 42 rebounds and moves upward to be electrically disconnected from the second test wire 44, and the circuit of the test mechanism is in the disconnected state.

Wherein one of the first test wire 43 and the second test wire 44, such as the second test wire 44, passes through the transformer 2.

Then, when the circuit of the testing mechanism is in a closed state, the current in the second testing line 44 generates a magnetic field, and the magnetic field generates a current, so that the transformer 2 is excited to generate a current, so that the transformer 2 inputs a current to the circuit board 3. When the chip on the circuit board 3 detects that the current delivered by the transformer 2 exceeds the current threshold, as shown in fig. 3, the telescopic rod 71 of the trip unit 7 is controlled to extend, so that the third leg 83 of the transmission member 8 is disengaged from the idle switch 5, the idle switch 5 is opened, and the circuit where the circuit breaker is located is broken. Furthermore, the circuit breaker can be proved to be in a good working state and still can play a circuit protection role.

When the circuit of the test mechanism is in a closed state, but the idle switch 5 is not switched to a non-pressed state, the circuit of the breaker is not opened. Then, it can be proved that the breaker is in a fault state, and cannot play a circuit protection role, and a user needs to replace the breaker in time.

Therefore, a user can periodically detect whether the circuit breaker can still work normally or not through the testing mechanism. This accredited testing organization adopts the torsional spring to realize the closure of accredited testing organization place circuit, and the elasticity of torsional spring is better, is difficult to take place permanent deformation, can prolong accredited testing organization's life. Moreover, the testing mechanism is simple in structure, convenient to install and beneficial to batch automatic production of the circuit breakers.

As described above, the first test wire 43 and the test torsion spring 42 are electrically connected, wherein there are various ways in which the two are electrically connected.

For example, one way may be to peel off the protective layer at one end of the first test wire 43 to expose the conductor, and to wind the exposed conductor around the test torsion spring 42, so as to electrically connect the first test wire 43 and the test torsion spring 42.

For another example, as shown in fig. 6 and fig. 9, the first test line 43 may include a first pin 431 and a first conductive line 432, wherein the first pin 431 has conductivity, and may be a metal tube, such as a copper tube, which is formed by punching and curling a metal sheet. As shown in fig. 6, the first pin 431 and the first conductive line 432 are fixedly connected, for example, the first pin 431 and the first conductive line 432 are fixedly connected by riveting.

In order to stabilize the first pin 431 in the test torsion spring 42, correspondingly, as shown in fig. 7 and with reference to fig. 8, the inner wall of the housing 1 has a first column 11, wherein the diameter of the first column 11 matches the inner diameter of the test torsion spring 42, so that the test torsion spring 42 can be fitted over the first column 11.

As shown in fig. 8, the first column 11 has a first elongated notch 111 along the length direction. The cross-sectional shape of the first strip-shaped notch 111 may be circular arc-shaped or semicircular.

As shown in fig. 3, the test torsion spring 42 is sleeved outside the first cylinder 11, and the first pin 431 is located in the first strip-shaped notch 111 in an interference manner and is in close contact with the test torsion spring 42. In this way, both the fixation of the test torsion spring 42 and the first test wire 43 and the electrical connection of the test torsion spring 42 and the first test wire 43 are achieved. This mounting of the test torsion spring 42 and the first test wire 43 is stable and reliable in terms of fixation and also in terms of electrical connection. Moreover, the installation mode is simple, and the installation is convenient.

As described above, one end of the second test wire 44 is fixed to the case 1, and the test torsion spring 42 and the second test wire 44 can be electrically connected and disconnected. The implementation is also manifold.

For example, as shown in fig. 6, the second test line 44 includes a second pin 441 and a second conductive line 442, the second test line 44 and the first test line 43 have the same structure, and the second test line 44 can also be shown with reference to fig. 9. The second pin 441 is electrically conductive, and may be a metal tube, such as a copper tube, formed by punching and rolling a metal sheet. As shown in fig. 6, the second pin 441 and the second conductive line 442 are fixedly connected, for example, the second pin 441 and the second conductive line 442 are fixedly connected by riveting.

In one example, the second testing wire 44 may be electrically connected to the testing torsion spring 42 through a second pin 441, and the second testing wire 44 may be electrically connected to the circuit board 3 through a second wire 442. For example, an end of the second conductive line 442 remote from the second pin 441 may be soldered on the circuit board 3. The electrical connection between the second pin 441 and the second arm b of the test torsion spring 42 can be achieved by direct contact, or can be achieved by other conductors, as will be described in detail below.

Thus, when the test button 41 is in a pressed state, the second arm b of the test torsion spring 42 moves downward to be electrically connected to the second pin 441. When the test button 41 is not pressed, the second arm b of the test torsion spring 42 moves up and down to electrically disconnect from the second pin 441.

As described above, the second arm b of the torsion spring 42 and the second pin 441 can be electrically connected through direct contact therebetween, or through other conductors.

For example, one way to electrically connect the second arm b of the test torsion spring 42 and the second pin 441 may be that the second pin 441 is fixed on the housing 1 and located on the track of the second arm b of the test torsion spring 42. Thus, when the second arm b of the test torsion spring 42 moves downward under the pressing of the test button 41, the second arm b of the test torsion spring 42 can touch the second pin 441, so as to electrically connect the second arm b of the test torsion spring 42 and the second pin 441. When the user releases the test button 41, the second arm b of the test torsion spring 42 rebounds to move upward and away from the second pin 441, so that the second arm b of the test torsion spring 42 is electrically disconnected from the second pin 441.

For another example, another way to electrically connect the second arm b of the test torsion spring 42 and the second pin 441 can be that the second arm b of the test torsion spring 42 can be electrically connected to the second pin 441 by the main spring 6.

As shown in fig. 3, the main spring 6 is fixed to the housing 1, and the first arm a of the main spring 6 is fixed to the movement locus of the second arm b of the test torsion spring 42. And the second pin 441 is fixed to the housing 1 by the main spring 6, and the second pin 441 is in close contact with the main spring 6, for example, the second pin 441 may be located in the main spring 6.

Thus, when the second arm b of the test torsion spring 42 moves downward under the pressing of the test button 41, the second arm b of the test torsion spring 42 can touch the first arm a of the main spring 6, so as to electrically connect the second arm b of the test torsion spring 42 and the first arm a of the main spring 6, and the first arm a of the main spring 6 is electrically connected to the second pin 441, so as to electrically connect the second arm b of the test torsion spring 42 and the second pin 441. When the user releases the test button 41, the second arm b of the test torsion spring 42 rebounds to move upward and away from the first arm a of the main spring 6, so that the second arm b of the test torsion spring 42 is electrically disconnected from the first arm a of the main spring 6, and the second arm b of the test torsion spring 42 is electrically disconnected from the second pin 441.

As described above, the second pin 441 is fixed to the housing 1 by the main spring 6, and the second pin 441 is in close contact with the main spring 6. For example, as shown in fig. 7 and with reference to fig. 8, the inner wall of the housing 1 has a second post 12, wherein the diameter of the second post 12 matches the inner diameter of the main spring 6 so that the main spring 6 can be fitted over the second post 12.

As shown in fig. 8, the second column 12 has a second strip-shaped notch 121 along the length direction. The cross-sectional shape of the second strip-shaped notch 121 may be circular arc-shaped or semicircular.

As shown in fig. 3, the main spring 6 is sleeved outside the second cylinder 12, and the second pin 441 is interference-located in the second strip-shaped notch 121 and is in close contact with the main spring 6. In this way, both the fixation of the main spring 6 and the second test wire 44 and the electrical connection of the main spring 6 and the second test wire 44 are achieved. This mounting of the second test wire 44 is stable and reliable in the fixing manner and also in the electrical connection. Moreover, the installation mode is simple, and the installation is convenient.

Thus, as shown in fig. 3 and with reference to fig. 2, when the user presses the test button 41, the second arm b of the test torsion spring 42 moves downward along the pressing direction under the pushing of the test button 41, and contacts with the first arm a of the main spring 6, so as to electrically connect the first test line 43 and the second test line 44, and the circuit of the test mechanism is in a closed state. When the user releases the test button 41, the second arm b of the test torsion spring 42 rebounds and moves upward to separate from the first arm a of the main spring 6, so that the first test line 43 and the second test line 44 are electrically disconnected, and the circuit of the test mechanism is in an open state.

In one example, in order to allow the second arm b of the test torsion spring 42 to be in stable contact with the first arm a of the main spring 6, the first arm a of the main spring 6 is correspondingly fixed to the housing. For example, as shown in fig. 7 and with reference to fig. 8, on the inner wall of the housing 1, and below the second arm b of the test torsion spring 42 away from the test button 41, there is a second card slot 13, and the first arm a of the main spring 6 is clamped in the second card slot 13.

For example, as shown in fig. 8, the second post 12 has an arc-shaped plate around it, and the arc-shaped plate has a break matching with the diameter of the first arm a of the main spring 6, and the break is the second slot 13. As shown in fig. 3, the main spring 6 may be located in the arc-shaped plate and sleeved outside the second cylinder 12, and the first arm a of the main spring 6 passes through the second slot 13 and is clamped with the second slot 13, and the first arm a of the main spring 6 is located on the downward movement track of the second arm b of the test torsion spring 42. The second pin 441 of the second testing line 44 is located in the second strip-shaped notch 121 in an interference manner, and is in close contact with the main spring 6, so as to achieve an electrical connection relationship between the second pin 441 and the main spring 6.

The second test line 44 is electrically connected to the main spring 6 through the second pin 441. It should be noted that the second testing wire 44 may not include the second contact pin 44, but only includes a conducting wire, and then, an end of the second testing wire 44 away from the circuit board 3 may be wound around the main spring 6 to be electrically connected with the main spring 6. In this embodiment, the manner of electrically connecting the second test line 44 and the main spring 6 is not limited.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A circuit breaker, characterized in that it comprises a case (1), a mutual inductor (2), a circuit board (3) and a testing mechanism (4), said testing mechanism (4) comprising a testing button (41), a testing torsion spring (42), a first testing line (43) and a second testing line (44);

the testing button (41) is slidably mounted in the shell (1), the testing torsion spring (42) is fixed in the shell (1), a first support arm (a) of the testing torsion spring (42) abuts against the inner wall of the shell (1), and a second support arm (b) abuts against the bottom of the testing button (41);

one end of the first test wire (43) is electrically connected with the test torsion spring (42), the other end of the first test wire is connected into the circuit board (3), one end of the second test wire (44) is fixed on the shell (1), the other end of the second test wire is connected into the circuit board (3), and one of the first test wire (43) and the second test wire (44) penetrates through the mutual inductor (2);

when the test button (41) is in a pressed state, the test torsion spring (42) and the second test line (44) are electrically connected, and when the test button (41) is in a non-pressed state, the test torsion spring (42) and the second test line (44) are electrically disconnected.

2. The circuit breaker according to claim 1, characterized in that said first test line (43) comprises a first pin (431) and a first conductor (432);

the first pin (431) is fixedly connected with the first lead (432), the first pin (431) is electrically connected with the test torsion spring (42), and the first lead (432) is connected into the circuit board (3).

3. The circuit breaker according to claim 2, characterized in that the inner wall of the housing (1) has a first column (11), the first column (11) having a first strip-shaped notch (111) along its length;

the testing torsion spring (42) is sleeved outside the first cylinder (11), and the first pin (431) is in interference fit with the first strip-shaped notch (111) and is in close contact with the testing torsion spring (42).

4. The circuit breaker of claim 2 wherein said first contact pin (431) is a metal tube crimped by sheet metal stamping;

the first pin (431) and the first lead (432) are fixedly connected in a riveting mode.

5. The circuit breaker according to claim 1, characterized in that said second test line (44) comprises a second pin (441) and a second conductor (442);

the second pin (441) is fixedly connected with the second lead (442), the second pin (441) is fixed on the shell (1), and the second lead (442) is connected into the circuit board (3);

when the test button (41) is in a pressed state, the second arm (b) of the test torsion spring (42) and the second pin (441) are electrically connected, and when the test button (41) is in a non-pressed state, the second arm (b) of the test torsion spring (42) and the second pin (441) are electrically disconnected.

6. A circuit breaker according to claim 5, characterized in that it comprises a main spring (6) for opening the circuit breaker's freewheeling switch (5);

the main spring (6) is fixed on the shell (1), and a first support arm (a) of the main spring (6) is fixed below a second support arm (b) of the test torsion spring (42) far away from the test button (41);

the second pin (441) is fixed on the shell (1) through the main spring (6), and the second pin (441) is electrically connected with the main spring (6);

the second arm (b) of the test torsion spring (42) and the first arm (a) of the main spring (6) are in contact when the test button (41) is in a pressed state, and the second arm (b) of the test torsion spring (42) and the first arm (a) of the main spring (6) are separated when the test button (41) is in a non-pressed state.

7. The circuit breaker according to claim 6, characterized in that the inner wall of the housing (1) has a second cylinder (12), the second cylinder (12) having a second strip-shaped notch (121) along the length direction;

the main spring (6) is sleeved outside the second cylinder (12), and the second contact pin (441) is in interference fit with the second strip-shaped notch (121) and is in close contact with the main spring (6).

8. The circuit breaker according to claim 6, characterized in that the inner wall of the housing (1) has a second catch groove (13) below the second leg (b) of the test torsion spring (42) remote from the test button (41), the first leg (a) of the main spring (6) catching in the second catch groove (13).

9. The circuit breaker of claim 5 wherein said second contact pin (441) is a metal tube that is crimped by sheet metal stamping;

the second pin (441) and the second lead (442) are fixedly connected in a riveting manner.

10. The circuit breaker according to any of the claims 1 to 9, characterized in that the bottom of the test button (41) has a first catch slot (411), the second arm (b) of the test torsion spring (42) being caught in the first catch slot (411).