CN217719473U - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
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- CN217719473U CN217719473U CN202221338790.0U CN202221338790U CN217719473U CN 217719473 U CN217719473 U CN 217719473U CN 202221338790 U CN202221338790 U CN 202221338790U CN 217719473 U CN217719473 U CN 217719473U
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- contact
- circuit breaker
- circuit board
- conductive wire
- lock catch
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Abstract
The utility model relates to a circuit breaker, include: a fixed stationary contact; a movable contact movable relative to the stationary contact to be closed and opened with the stationary contact; the outlet end is electrically connected with the fixed contact; and a protection module. Wherein the protection module includes: a circuit board; a conductive wire having a first end electrically connected to the circuit board; and a thermal deformation member connected to the wire outlet end, and deformed when a temperature threshold is reached and electrically connected to a second end of the conductive wire due to the deformation, the second end being opposite to the first end; wherein the circuit board is configured to be capable of controlling disconnection between the movable contact and the fixed contact when the thermally deformable member is connected to the second end of the conductive wire.
Description
Technical Field
The utility model belongs to the electrical equipment field, more specifically relates to a circuit breaker.
Background
The circuit breaker in the prior art, such as a miniature circuit breaker, has poor wiring problems. Poor wiring can greatly increase contact resistance, generate abnormal temperature rise and greatly reduce the flame retardance of the shell, so that the shell is aged, softened and melted until the shell is ignited; especially for the outlet end, the bimetallic strip cannot be tripped in a short time when the temperature rises abnormally, the product cannot be effectively protected, fire can be caused, and potential safety hazards exist.
Therefore, there is still a need for a circuit breaker that allows effective prevention of fire when the outlet terminals are hot.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides a circuit breaker, it includes: a fixed stationary contact; a movable contact movable relative to the stationary contact to be closed and opened with the stationary contact; the outlet end is electrically connected with the fixed contact; a protection module comprising:
a circuit board;
a conductive wire having a first end electrically connected to the circuit board;
a thermal deformation member connected to the outlet end, capable of deforming when a temperature threshold is reached and electrically connected to a second end of the conductive wire due to deformation, the second end being opposite to the first end;
when the thermal deformation piece is connected with the second end of the conductive wire, the circuit board can control the moving contact and the static contact to be disconnected.
From this, according to the utility model discloses an among the circuit breaker, with the hot deformation piece of leading-out terminal heat and electricity connection with the conductor wire switch-on when the heat altered shape between leading-out terminal and circuit board, the circuit board consequently can control the disconnection between moving contact and the static contact to the operation of interrupt contactor plays effectual guard action to it, ensures the safety in utilization.
According to various embodiments of the invention, the proposed circuit breaker may further comprise one or more of the following further developments.
In some embodiments, the protection module further comprises a zero sequence current transformer electrically connected to the circuit board, the phase line and the zero line of the circuit breaker passing through the zero sequence current transformer, wherein the conductive line passes through the zero sequence current transformer.
In some embodiments, the zero sequence current transformer is configured to detect a zero sequence current and send a detection signal to the circuit board.
When the conducting wire is connected due to thermal deformation of the thermal deformation piece, the zero sequence current transformer can detect the existence of unbalanced current passing through the conducting wire, so that the zero sequence current transformer can feed back the detection to the circuit board, and then the circuit board can control the opening of the movable contact and the fixed contact when receiving the feedback. Therefore, the utility model provides a circuit breaker has realized effectual thermal protection with very simple structural design.
In some embodiments, the second end of the conductive wire is connected to a metal contact provided at the circuit breaker, and the thermal deformation member is not connected to the metal contact when not thermally deformed and is connected to the metal contact when the thermal deformation reaches a threshold value.
In some embodiments, the thermally deformable member is a bimetallic strip.
In some embodiments, the thermally deformable member is connected to the outlet end by a thermally conductive member.
In some embodiments, the circuit breaker further includes a release electrically connected to the circuit board, wherein the circuit board controls the moving contact and the stationary contact to be disconnected by controlling the release to move when the thermal deformation element is connected to the second end of the conductive wire.
In some embodiments, the release includes a trip coil, a push rod, and a linkage mechanism connected between the push rod and the movable contact, wherein when the thermal deformation element is connected to the second end of the conductive wire, the circuit board can transmit a signal to the trip coil, the trip coil thus moves the push rod, and the push rod drives the linkage mechanism to disconnect the movable contact from the fixed contact.
In some embodiments, the linkage mechanism comprises at least: the moving contact is arranged to be linked with the mechanism body; an elastic member connected between the mechanism main body and a holder of the circuit breaker; a latch driven by the jack and provided to be pivotable relative to the mechanism body; wherein: during the closing period of the moving contact and the static contact, the elastic component stores potential energy, and the lock catch can prevent the movement of the mechanism body; when the ejector rod moves due to the fact that the tripping coil receives the signal, the ejector rod drives the lock catch to rotate, so that the lock catch does not stop the mechanism main body any more, the mechanism main body rotates under the action of potential energy released by the elastic component, and the moving contact and the fixed contact are driven to be disconnected.
In some embodiments, the mechanism body is further provided with a release member, wherein: the lock catch and the release fastener are interlocked to prevent the movement of the mechanism body during the closing of the movable contact and the fixed contact; when the ejector rod moves due to the fact that the tripping coil receives the signal, the ejector rod drives the lock catch to rotate, and therefore the lock catch is separated from the tripping piece.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present disclosure and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from the drawings without inventive effort. In the drawings:
fig. 1 is a perspective view of the interior of a circuit breaker according to one embodiment of the present invention;
fig. 2 is an enlarged view of a portion a circled in fig. 1.
List of reference numerals:
1. circuit breaker
10. Static contact
20. Moving contact
30. Wire outlet terminal
40. Conductive wire
41. First end
42. Second end
50. Thermally deformable element
51. Heat conducting member
60. Zero sequence current transformer
70. Phase line
80. Zero line
90. Support frame
91. Metal contact
100. Circuit board
110. Trip coil
120. Top rod
130. Mechanism body
140. Elastic member
150. Lock catch
160. Tripping device
Detailed Description
Hereinafter, a circuit breaker according to an embodiment of the present disclosure is described in detail with reference to the accompanying drawings. To make the objects, technical solutions and advantages of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure.
Thus, the following detailed description of the embodiments of the present disclosure, presented in conjunction with the figures, is not intended to limit the scope of the claimed disclosure, but is merely representative of selected embodiments of the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The singular forms include the plural unless the context otherwise dictates otherwise. Throughout the specification, the terms "comprises," "comprising," "has," "having," "includes," "including," "having," "including," and the like are used herein to specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
In addition, even though terms including ordinal numbers such as "first", "second", etc., may be used to describe various elements, the elements are not limited by the terms, and the terms are used only to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the disclosed product is used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description and simplification of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure.
As shown in fig. 1-2, according to an embodiment of the present invention, a circuit breaker 1 is provided, which includes a fixed contact 10 and a movable contact 20, wherein the movable contact 20 can move relative to the corresponding fixed contact 10 to close and open with the fixed contact 10. The circuit breaker 1 further comprises an outlet terminal 30, the outlet terminal 30 being electrically connected to the stationary contact 10 and, for example, being used for electrical connection to an external connection terminal.
In order to ensure that circuit breaker 1 provides thermal protection, especially provide thermal protection to the overheated condition of leading to leading-out terminal 30 with outside binding post contact failure, the utility model provides a circuit breaker 1 still includes protection module. As shown, the protection module may be configured to include a circuit board 100, a conductive wire 40, and a thermal deformation member 50. The conductive line 40 may be electrically connected to the circuit board 100 through a first end 41, for example, the first end 41 of the conductive line is soldered to the circuit board 100. The thermal deformation element 50 is connected to the outlet terminal 30, for example, the outlet terminal 30 via the heat conduction element 51, and when the temperature of the thermal deformation element 50 reaches the threshold temperature, the deformation amount generated can be electrically connected to the second end 42 of the conductive wire 40 opposite to the first end 41, and thus the conductive wire 40 is connected between the outlet terminal 30 and the circuit board 100. In one particular embodiment, the thermally deformable member 50 is a bimetallic strip, more particularly a sheet of two (or more) layers of metals having different coefficients of thermal expansion. The circuit board 100 is configured to control the disconnection between the movable contact 20 and the fixed contact 10 of the circuit breaker 1 when the thermal deformation element 50 is connected to the second end 42 of the conductive wire 40, i.e., when the conductive wire 40 is connected between the outlet end 30 and the circuit board 100.
Therefore, according to the utility model discloses an in the circuit breaker 1, the thermal deformation piece 50 of being connected with leading-out terminal 30 heat and electricity is put through conductor wire 40 between leading-out terminal 30 and circuit board 100 when the thermal deformation, and circuit board 100 can control the disconnection between moving contact 20 and the static contact 10 consequently to the operation of interruption contactor 1 plays effectual guard action to it, ensures the safety in utilization.
In some embodiments, as shown in fig. 1-2, the protection module may further include a zero sequence current transformer 60 electrically connected to the circuit board 100, wherein the conductive wire 40 is disposed through the zero sequence current transformer 60. In a specific embodiment, the phase line 70 and the zero line 80 of the circuit breaker 1 pass through the zero sequence current transformer 60, and the phase line 70 is electrically connected between the fixed contact 10 and the outlet end 30, which allows detecting the leakage condition of the circuit breaker 1. More specifically, when no leakage occurs in the circuit breaker, the currents flowing in the phase line 70 and the zero line 80 passing through the zero-sequence current transformer 60 are balanced with each other; when the circuit breaker is in a leakage state, the currents flowing through the phase line 70 and the zero line 80 of the zero sequence current transformer 60 can no longer be balanced with each other, so that a zero sequence current is generated in the zero sequence current transformer 60, and the zero sequence current transformer 60 can send a zero sequence current detection signal to the circuit board 100. The utility model discloses in, set up conductor wire 40 into passing this zero sequence current transformer 60 for when conductor wire 40 took place the heat altered shape because of the heat altered shape and put through between leading-out terminal 30 and circuit board 100, can produce zero sequence current in zero sequence current transformer 60, will detect this zero sequence current among the zero sequence current transformer 60 and give circuit board 100 with relevant detection transfer, make circuit board 100 can control the disconnection of moving contact 20 and static contact 10 from this. Thus, the circuit breaker 1 according to the invention achieves an effective thermal protection with a very simple structural design.
In some embodiments, as shown in fig. 1-2, the second end 42 of the conductive wire 40 is connected to a metal contact 91 provided at the circuit breaker 1, and the thermal deformation member 50 is not connected to the metal contact 91 when it is not thermally deformed, and is connected to the metal contact 91 when it is thermally deformed, and thus is electrically connected to the conductive wire 40. This allows flexibility in the positioning of the metal contacts 91 and therefore the configuration of the thermally deformable member 50, according to the available space inside the circuit breaker 1, in favour of space compactness.
In some embodiments, as shown in fig. 1, the circuit breaker 1 further includes a release electrically connected to the circuit board 100, wherein when the thermal deformation element 50 is connected to the second end 42 of the conductive wire 40, i.e., when the conductive wire 40 is connected between the outlet end 30 and the circuit board 100, the circuit board 100 controls the release to move to control the moving contact 20 and the stationary contact 10 to be disconnected. In a more specific embodiment, the trip device may include a trip coil 110, a top bar 120, and a linkage connected between the top bar 120 and the movable contact 20. When the thermal deformation element 50 is connected to the second end 42 of the conductive wire 40, the circuit board 100 can transmit a signal to the trip coil 110, and the trip coil 110 accordingly moves the push rod 120, and the push rod 120 in turn drives the linkage mechanism to move and accordingly drives the movable contact 20 to move to be disconnected from the stationary contact 10. In a more specific embodiment, the trip coil 110 and the jack 120 constitute an electromagnetic actuator.
In some more specific embodiments, as shown in fig. 1, the linkage mechanism includes at least: a mechanism body 130, wherein the movable contact 20 is arranged to be linked with the mechanism body 130; an elastic member 140 connected between the mechanism main body 130 and the cradle 90 of the circuit breaker 1, the elastic member 140 being in the form of a compression spring, for example; and a latch 150 driven by the jack 120 and provided to be pivotable with respect to the mechanism main body 130. Wherein: during the closing of the movable contact 20 and the fixed contact 10, the elastic member 140 stores potential energy, and the latch 150 can prevent the movement of the mechanism body 130; when the push rod 120 moves due to the signal received by the trip coil 110, the push rod 120 drives the latch 150 to rotate (counterclockwise in the figure), so that the latch 150 no longer stops the mechanism body 130, and at this time, the mechanism body 130 rotates under the action of the potential energy released by the elastic member 140, thereby driving the moving contact 20 to be disconnected from the stationary contact 10.
In some more specific embodiments, as shown in fig. 1, the mechanism body 130 is further provided with a release member 160, wherein: during the closing of the movable contact 20 and the fixed contact 10, the latch 150 interlocks with the release 160 to participate in preventing the movement of the mechanism body 130; when the push rod 120 moves due to the signal received by the trip coil 110, the push rod 120 drives the latch 150 to rotate (counterclockwise in the figure), so that the latch 150 is disengaged from the trip 160, and therefore the mechanism body 130 cannot be stopped, so that the mechanism body 130 rotates under the action of the elastic member 140 and drives the movable contact 20 to be disconnected from the stationary contact 10.
The exemplary embodiment of the circuit breaker provided by the present invention has been described in detail with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations of the various technical features and structures provided by the present invention can be made without departing from the scope of the present invention.
The scope of the present disclosure is not defined by the embodiments described above but is defined by the appended claims and equivalents thereof.
Claims (10)
1. A circuit breaker, characterized in that the circuit breaker comprises:
a fixed stationary contact;
a movable contact movable relative to the stationary contact to be closed and opened with the stationary contact;
the outlet end is electrically connected with the fixed contact;
a protection module comprising:
a circuit board;
a conductive wire having a first end electrically connected to the circuit board;
a thermal deformation member connected to the outlet end, capable of deforming when a temperature threshold is reached and electrically connected to a second end of the conductive wire due to deformation, the second end being opposite to the first end;
wherein the circuit board is configured to be capable of controlling disconnection between the movable contact and the fixed contact when the thermally deformable member is connected to the second end of the conductive wire.
2. The circuit breaker of claim 1,
the protection module also comprises a zero sequence current transformer electrically connected with the circuit board, a phase line and a zero line of the circuit breaker penetrate through the zero sequence current transformer,
wherein the conductive wire is also arranged to pass through the zero sequence current transformer.
3. The circuit breaker of claim 2,
the zero sequence current transformer is arranged to be able to detect a zero sequence current and send a detection signal to the circuit board.
4. The circuit breaker according to any of claims 1 to 3,
the second end of the conductive wire is connected to a metal contact provided at the circuit breaker, and the thermal deformation member is configured not to be connected to the metal contact when not thermally deformed and to be connected to the metal contact when the thermal deformation reaches a threshold value.
5. The circuit breaker according to any of claims 1 to 3,
the thermally deformable member is a bi-metallic strip.
6. The circuit breaker according to any of claims 1 to 3,
the thermal deformation member is configured to be connected to the outlet terminal through a heat conductive member.
7. The circuit breaker according to claim 2 or 3,
the circuit breaker further includes a trip unit electrically connected to the circuit board,
wherein the circuit board is further configured to control disconnection between the movable contact and the stationary contact by controlling movement of the trip when the thermally deformable member is connected to the second end of the conductive wire.
8. The circuit breaker of claim 7, wherein said trip unit comprises a trip coil, a trip bar, and a linkage connected between said trip bar and said movable contact,
when the thermal deformation piece is connected with the second end of the conductive wire, the circuit board can transmit signals to the tripping coil, the tripping coil enables the ejector rod to move, and the ejector rod drives the linkage mechanism to disconnect the moving contact and the static contact.
9. The circuit breaker of claim 8,
the linkage mechanism at least comprises:
the moving contact is arranged to be linked with the mechanism body;
an elastic member connected between the mechanism main body and a holder of the circuit breaker;
a lock catch driven by the jack and provided to be pivotable with respect to the mechanism main body;
wherein:
during the closing period of the moving contact and the static contact, the elastic component stores potential energy, and the lock catch can prevent the movement of the mechanism body;
when the ejector rod moves due to the fact that the tripping coil receives the signal, the ejector rod drives the lock catch to rotate, so that the lock catch does not stop the mechanism main body any more, the mechanism main body rotates under the action of potential energy released by the elastic component, and the moving contact and the fixed contact are driven to be disconnected.
10. The circuit breaker of claim 9,
the mechanism main body is also provided with a release fastener,
wherein:
the lock catch and the release fastener are interlocked to prevent the movement of the mechanism body during the closing of the movable contact and the fixed contact;
when the ejector rod moves due to the fact that the tripping coil receives the signal, the ejector rod drives the lock catch to rotate, and therefore the lock catch is separated from the tripping piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221338790.0U CN217719473U (en) | 2022-05-31 | 2022-05-31 | Circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221338790.0U CN217719473U (en) | 2022-05-31 | 2022-05-31 | Circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217719473U true CN217719473U (en) | 2022-11-01 |
Family
ID=83794184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221338790.0U Active CN217719473U (en) | 2022-05-31 | 2022-05-31 | Circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217719473U (en) |
-
2022
- 2022-05-31 CN CN202221338790.0U patent/CN217719473U/en active Active
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