CN216928420U - Circuit breaker and tripping device thereof - Google Patents
Circuit breaker and tripping device thereof Download PDFInfo
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- CN216928420U CN216928420U CN202220236196.4U CN202220236196U CN216928420U CN 216928420 U CN216928420 U CN 216928420U CN 202220236196 U CN202220236196 U CN 202220236196U CN 216928420 U CN216928420 U CN 216928420U
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Abstract
The utility model discloses a circuit breaker and a tripping device thereof, wherein the tripping device is used for the circuit breaker and comprises a tripping assembly and a base, the tripping assembly comprises a magnetic conduction piece, a heating element and a bimetallic strip, and the heating element and the bimetallic strip are both fixedly connected with the magnetic conduction piece and are relatively fixed with the base through the magnetic conduction piece. The scheme can improve the reliability of the installation of the tripping component and the base, and simultaneously reduces the limitation on the material selection and the thickness of the heating element.
Description
Technical Field
The utility model relates to the technical field of electricity, in particular to a circuit breaker and a tripping device thereof.
Background
The circuit breaker is mainly used for overcurrent protection of a line, the overcurrent protection of the circuit breaker is divided into overload protection and short-circuit protection, related structures of the two protections are generally integrated together to form a tripping assembly, and the tripping assembly is installed on a base inside the circuit breaker.
The mounting structure of the existing tripping assembly and the base is as follows: a threaded hole is formed in a heating element of the tripping assembly, and a screw penetrates through the threaded hole to fix the heating element on the base. However, the heating element is mostly made of copper or copper alloy, so that the hardness is low, and particularly when the thickness of the heating element is small, the strength of the threaded hole is reduced, the fastening requirement is difficult to meet, the product is easy to damage, and the material selection and thickness setting of the heating element are greatly limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a circuit breaker and a tripping device thereof, which are beneficial to improving the installation reliability of a tripping component and a base through structural optimization and reducing the limitation on a heating element.
In order to solve the technical problem, the utility model provides a tripping device for a circuit breaker, which comprises a tripping assembly and a base, wherein the tripping assembly comprises a magnetic conduction piece, a heating element and a bimetallic strip, and the heating element and the bimetallic strip are both fixedly connected with the magnetic conduction piece and are relatively fixed with the base through the magnetic conduction piece.
The trip unit of above, said trip assembly comprising an armature; the magnetic conduction piece comprises a first magnetic conduction part and a second magnetic conduction part which are connected with each other, the first magnetic conduction part is used for being matched with the armature, the second magnetic conduction part is fixedly connected with the base, and the heating element and the bimetallic strip are fixedly connected with the second magnetic conduction part.
According to the trip device, the heating element is located between the bimetallic strip and the second magnetic conduction part, and at least part of the heating element is attached to the magnetic conduction part.
According to the trip device, the second magnetic conduction part comprises the first plate part and the second plate part which are bent, the second plate part is fixedly connected with the base, and the heating element and the bimetallic strip are fixedly connected with the first plate part.
The trip device as described above, the heating element has a bent piece portion, the bent piece portion is at least partially attached to the second plate portion, and the heating element is at least partially attached to the first plate portion.
In the trip device, the trip assembly includes a bracket, the bracket is fixedly connected to the first magnetic conductive portion, the bracket is provided with a protrusion, and the base is provided with a slot matched with the protrusion.
In the trip device described above, the base is provided with a guide groove portion into which at least a part of the second plate portion is inserted.
The trip unit as described above, the magnetic conducting member and the base have a positioning structure therebetween, and the positioning structure is used for defining the relative position of the two.
The trip device comprises a positioning structure and a positioning structure, wherein the positioning structure comprises a positioning convex part and a positioning hole part, and the positioning convex part can extend into the positioning hole part; one of the positioning convex part and the positioning hole part is arranged on the magnetic conduction piece, and the other one is arranged on the base.
The utility model also provides a circuit breaker, which comprises the tripping device, wherein the tripping device is positioned in the shell of the circuit breaker.
Compared with the prior art, the utility model has the following technical effects:
firstly, the tripping device realizes the installation of the tripping component and the base by connecting the magnetic conduction piece and the base, specifically, the heating element and the bimetallic strip are fixed on the magnetic conduction piece, and then the magnetic conduction piece is fixedly connected with the base, namely, the heating element and the bimetallic strip are relatively fixed with the base through the magnetic conduction piece, and the arrangement of a connecting hole on the heating element of the tripping component is avoided, so that the limitations of the aspects of material selection, thickness and the like of the heating element due to the connection requirement are eliminated; meanwhile, the hardness of the magnetic conduction piece is relatively high, so that the connection reliability of the magnetic conduction piece and the base is favorably improved, and the repair rate of the product is reduced.
Secondly, in the alternative of the present invention, at least a part of the heating element is attached to the magnetic conductive member, so that the magnetic field environment around the conductive loop can be improved, and the magnetic field influence between adjacent conductive loops can be reduced during the series-phase verification of the short-circuit protection, so that the short-circuit protection characteristic is more stable and reliable.
Drawings
FIG. 1 is a schematic, partially cross-sectional view of an embodiment of a trip assembly mounted with a housing having a base;
fig. 2 is a schematic structural view of the trip assembly of fig. 1;
FIG. 3 is a schematic diagram of the components of FIG. 2 that form the conductive loop;
fig. 4 is a schematic structural view of the magnetic conductive member in fig. 2;
FIG. 5 is a schematic view of the magnetic conductive member and the bracket shown in FIG. 2;
FIG. 6 is a schematic diagram of a housing with a base in an embodiment;
fig. 7 is a partially enlarged view of a portion a in fig. 6.
Description of reference numerals:
the trip device comprises a tripping component 100, a movable contact 101, a flexible coupling 102, a heating element 103, a bimetallic strip 104, a magnetic conduction piece 105, a bracket 106, an armature 107, an armature spring 108 and a connecting plate 109;
the bending piece 131, the protrusion 161, and the fastening hole 191;
a first magnetic conductive portion 151, a second magnetic conductive portion 152, a first plate portion 1521, a second plate portion 1522, a connection hole 153, a positioning hole portion 154, and a rivet hole 155;
the shell 200, the base 201, the mounting hole 211, the positioning convex part 212, the guide bulge 213 and the clamping groove 214;
Detailed Description
In order that those skilled in the art will better understand the disclosure, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments.
For ease of understanding and clarity of description, the following description is made in conjunction with a circuit breaker and its trip mechanism.
Circuit breakers are used primarily for overcurrent protection of lines and are typically provided with a trip device to detect power supply anomalies. The overcurrent protection of circuit breakers is divided into overload protection and short circuit protection, and the related structures of these two protections are integrated together to form a trip assembly, which is generally mounted on a base inside the housing of the circuit breaker.
Referring to fig. 1, fig. 1 is a partial sectional view of the trip device and the housing with the base of the present embodiment after being installed.
In this embodiment, the trip assembly 100 of the circuit breaker is mounted on a base 201 in the housing 200, and in the illustrated embodiment, the base 201 is integrally formed with the housing 200, that is, the base 201 and the housing 200 are an integral component; in other embodiments, the base 201 may be formed separately and then fixed to the housing 200.
This trip unit's trip assembly 100 includes magnetic conduction piece 105, heating element 103 and bimetallic strip 104, and wherein, heating element 103 and bimetallic strip 104 all with magnetic conduction piece 105 fixed connection, magnetic conduction piece 105 is equipped with the installation department, and magnetic conduction piece 105 is through its installation department and base 201 fixed connection, and heating element 103 and bimetallic strip 104 are relatively fixed with base 201 through magnetic conduction piece 105 promptly, say that heating element 103 is not directly connected with base 201.
In this embodiment, a connection hole 153 is specifically formed in the mounting portion, a mounting hole 211 is formed in a position corresponding to the base 201, and during assembly, the screw 301 penetrates through the mounting hole 211 and the connection hole 153 to be screwed, that is, the connection hole 153 is specifically in the form of a threaded hole. Of course, the connection holes 153 may be correspondingly provided according to the fastening member for connection. In other embodiments, the mounting portion of the magnetic conductive member 105 may be fixedly connected to the base 201 by other fixing methods.
After the arrangement, the installation of the trip assembly 100 and the base 201 is realized by the connection of the magnetic conductive member 105 and the base 201, and a threaded hole for connection is avoided being formed in the heating element 103 of the trip assembly 100, so that the limitation on the selection and thickness of the heating element 103 due to the connection requirement is eliminated, and the heating element 103 can be made of a material with relatively small thickness and relatively low strength according to the application requirement; meanwhile, because the hardness of the magnetic conduction member 105 is relatively high, the strength of the connection hole 153 is also high, which is beneficial to improving the reliability of the connection between the magnetic conduction member 105 and the base 201, thereby reducing the repair rate of the product.
In practical application, because the cost of iron is low, the magnetic conducting member 105 is made of iron core, and of course, other materials with magnetic conducting function can be selected according to requirements.
Please refer to fig. 2 to 5 together, wherein fig. 2 is a schematic structural diagram of the trip assembly in fig. 1; FIG. 3 is a schematic diagram of the components of FIG. 2 that form the conductive loop; fig. 4 is a schematic structural view of the magnetic conducting member in fig. 2; fig. 5 is a schematic view of the connection between the magnetic conductive member and the bracket in fig. 2.
In this embodiment, the trip assembly 100 further includes a movable contact 101, a flexible coupling 102 and an armature 107, wherein the movable contact 101 is connected to one end of the heating element 103 through the flexible coupling 102, and the heating element 103 is connected to the bimetal 104. Usually, the other end of the heating element 103 is further fixed with a connecting plate 109 by welding, the connecting plate 109 can be provided with a fixing hole 191, when assembling, the connecting plate 109 is connected with the base 201 through the fixing hole 191, and the firmness between the trip assembly 100 and the base 201 can be improved by combining the connection between the magnetic conductive member 105 and the base 201.
The moving contact 101, the flexible coupling 102, the heating element 103 and the connecting plate 109 mainly form a conductive loop of the trip assembly 100, when a current flows, the heating element 103 generates heat, the larger the current is, the larger the heat generated by the heating element 103 is, the heat generated by the heating element 103 is transferred to the bimetal 104, and after the bimetal 104 is heated, bent and deformed, the traction rod is pushed to realize the trip operation of the circuit breaker. Here, the specific implementation manner of the trip operation of the trip assembly 100 is not the core invention point of the present application, and those skilled in the art can implement the trip operation based on the prior art, and will not be described in detail herein.
In this embodiment, the magnetic conducting member 105 includes a first magnetic conducting portion 151, and referring to fig. 2 and fig. 4, the first magnetic conducting portion 151 is engaged with the armature 107, and when short circuit occurs, the first magnetic conducting portion 151 attracts the armature 107 to rotate and impact the drawbar to implement the trip operation; usually, a bracket 106 is connected to the first magnetically permeable part 151 for mounting the armature 107 and for resetting the armature 107, and the bracket 106 may be fixed relative to the first magnetically permeable part 151 in a riveting manner. Here, the specific implementation manner of the tripping operation of the tripping assembly 100, the matching manner between the armature 107 and the bracket 106, the specific structure of the bracket 106, and the like are not the core points of the present application, and those skilled in the art can implement the operation based on the prior art, and therefore, the description thereof is omitted.
In order to connect the magnetic conduction member 105 and the base 201, in this embodiment, the first magnetic conduction portion 151 of the magnetic conduction member 105 is further connected with a second magnetic conduction portion 152, the second magnetic conduction portion 152 is fixedly connected with the base 201, and both the heating element 103 and the bimetal 104 are fixedly connected with the second magnetic conduction portion 152.
Specifically, the second magnetic conductive portion 152 includes a first plate portion 1521 and a second plate portion 1522, which are bent, wherein the first plate portion 1521 is fixed below the first magnetic conductive portion 151, and the second plate portion 1522 is formed by bending a bottom end of the first plate portion 1521.
In the illustrated example, the first plate portion 1521 and the second plate portion 1522 are substantially L-shaped, and thus, the second plate portion 1522 forms the mounting portion of the magnetic conduction member 105, and the second plate portion 1522 is provided with the connection hole 153. Referring to fig. 1, during assembly, the second plate portion 1522 may be attached to the bottom wall of the base 201, the connection hole 153 corresponds to the mounting hole 211 of the base 201, the screw 301 passes through the mounting hole 211 and then is screwed into the connection hole 153, and the related accessories of the trip assembly 100 are located in the cavity of the base 201.
Referring to fig. 6 and 7 together, fig. 6 is a schematic structural diagram of a housing provided with a base in an embodiment; fig. 7 is a partially enlarged view of a portion a in fig. 6.
In this embodiment, a positioning structure is disposed between the mounting portion of the magnetic conductive member 105, i.e., the first plate portion 1522, and the base 201, and the positioning structure is used to define the relative position of the two, so that when the assembly is convenient, the connecting hole 153 of the second plate portion 1522 can be aligned with the mounting hole 211 of the base 201, which is beneficial to improving the assembly efficiency.
Specifically, in the illustrated embodiment, the second plate portion 1522 is provided with a positioning hole portion 154, and the corresponding position of the base 201 is provided with a positioning protrusion 212, when assembling, the positioning hole portion 154 of the second plate portion 1522 may correspond to the positioning protrusion 212 of the base 201, so that the positioning protrusion 212 is inserted into the positioning hole portion 154, so as to define the relative position of the two, and then the two are screwed and fixed by the screw 301.
In another embodiment, the positioning protrusion may be provided on the second plate portion 1522, and the positioning hole 154 may be provided on the base 201. In practical implementation, the positioning protrusion 212 may be shaped as required, for example, a circular boss, as shown in the figure, but may also be in the form of a boss with other shapes, such as a square shape, an oval shape, and the like.
As shown in fig. 7, in this embodiment, two guide protrusions 213 are further provided on the base 201, and a guide groove portion is formed between the two guide protrusions 213, and when assembling, the end portion of the second plate portion 1522 is inserted into the guide groove portion, that is, between the two guide protrusions 213, so as to determine the assembling direction of the second plate portion 1522, which is also advantageous to improve the assembling efficiency. In practice, the position of the guide protrusion 213 may not be at the end position of the second plate portion 1522, such as at the middle position.
With reference to fig. 1 and 2, there are two connection points between the trip assembly 100 and the base 201, one is the second plate portion 1522 of the magnetic conductive member 105, and the other is the connection plate 109, most of the accessory structures of the trip assembly 100 are installed on the first magnetic conductive portion 151 of the magnetic conductive member 105, and are concentrated on the upper portion of the trip assembly 100, in order to improve the stability between the trip assembly 100 and the base 201 after assembly, in this solution, the protrusions 161 are respectively disposed on two opposite side walls of the bracket 106, and meanwhile, as shown in fig. 7, the corresponding positions of the two opposite side walls of the base 201 are provided with the slots 214, after assembly, the two protrusions 161 of the bracket 106 can be respectively clamped into the two slots 214, so as to provide a support for the bracket 106, which is favorable for structural stability.
Of course, in practice, it is also possible to provide the protrusion 161 only on one side of the bracket 106; depending on the specific structure, the protrusion 161 may be disposed at other positions of the bracket 106 in practical applications, and is not limited to the illustration.
In this embodiment, based on the foregoing structure of the magnetic conductive member 105, both the heating element 103 and the metal member 104 may be fixed relative to the magnetic conductive member 105, specifically, as shown in fig. 4, a rivet hole 154 is provided on the first plate portion 1521 of the second magnetic conductive portion 152 of the magnetic conductive member 105, and as shown in fig. 1 and 2, the heating element 103, the metal member 104, and the magnetic conductive member 105 may be fixed together by a rivet 32 passing through the rivet hole 154. In the illustration, two rivet holes 154 are provided to improve the securing reliability; in other applications, the number of rivet holes 154 may be set as desired.
Specifically, the heating element 103 is located between the metal member 104 and the magnetic conductive member 105, so that at least a part of the structure of the heating element 103 is attached to the magnetic conductive member 105, specifically, at least a part of the heating element 103 is attached to the first plate portion 1521, of course, the heating element 103 may also be attached to the first magnetic conductive portion 151 of the magnetic conductive member 105 at the same time, in practical applications, a magnetic loop generated when a current flows through the heating element 103 may flow through the magnetic conductive member 105 with a higher magnetic conductivity, thereby reducing the influence on an adjacent magnetic field, facilitating improvement of stability and accuracy of a short-circuit protection characteristic of the trip assembly 100, reducing a requirement on an operating current threshold of the trip assembly 100, and facilitating reduction of production difficulty.
Specifically, the heating element 103 may have a bent sheet portion 131, and at least a portion of the bent sheet portion 131 is attached to the second plate portion 1522 of the magnetic conductive member 105, so as to further improve the contact between the heating element 103 and the magnetic conductive member 105, so that most of the magnetic circuit generated by the current flowing through the heating element 103 can flow through the magnetic conductive member 105, which is more beneficial to improving the precision of the short-circuit protection characteristic.
The circuit breaker and the tripping device thereof provided by the utility model are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The tripping device is characterized by comprising a tripping assembly and a base, wherein the tripping assembly comprises a magnetic conduction piece, a heating element and a bimetallic strip, and the heating element and the bimetallic strip are fixedly connected with the magnetic conduction piece and are relatively fixed with the base through the magnetic conduction piece.
2. The trip unit of claim 1, wherein the trip assembly includes an armature; the magnetic conduction piece comprises a first magnetic conduction part and a second magnetic conduction part which are connected with each other, the first magnetic conduction part is used for being matched with the armature, the second magnetic conduction part is fixedly connected with the base, and the heating element and the bimetallic strip are fixedly connected with the second magnetic conduction part.
3. The trip unit of claim 2, wherein the heating element is positioned between the bimetal strip and the second magnetically permeable portion, and the heating element is at least partially engaged with the magnetically permeable member.
4. The trip unit of claim 3, wherein the second magnetically permeable portion comprises a first bent plate portion and a second bent plate portion, the second plate portion is fixedly connected to the base, and the heating element and the bimetal are both fixedly connected to the first plate portion.
5. The trip unit of claim 4, wherein the heating element has a bent tab portion at least partially engaged with the second plate portion, and wherein the heating element is at least partially engaged with the first plate portion.
6. The trip unit according to claim 2, wherein the trip unit comprises a bracket fixedly connected to the first magnetic conductive portion, the bracket is provided with a protrusion, and the base is provided with a slot engaged with the protrusion.
7. The trip unit according to claim 4, wherein a guide groove portion is provided on the base, and at least a part of the second plate portion is inserted into the guide groove portion.
8. The trip unit of any of claims 1-7, wherein a locating structure is provided between the magnetically permeable member and the base, the locating structure defining a relative position of the magnetically permeable member and the base.
9. The trip unit according to claim 8, wherein the positioning structure comprises a positioning projection and a positioning hole portion, the positioning projection being capable of protruding into the positioning hole portion; one of the positioning convex part and the positioning hole part is arranged on the magnetic conduction piece, and the other one is arranged on the base.
10. A circuit breaker comprising the trip unit of any of claims 1-9, the trip unit being located within a housing of the circuit breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220236196.4U CN216928420U (en) | 2022-01-26 | 2022-01-26 | Circuit breaker and tripping device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220236196.4U CN216928420U (en) | 2022-01-26 | 2022-01-26 | Circuit breaker and tripping device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216928420U true CN216928420U (en) | 2022-07-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220236196.4U Active CN216928420U (en) | 2022-01-26 | 2022-01-26 | Circuit breaker and tripping device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216928420U (en) |
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2022
- 2022-01-26 CN CN202220236196.4U patent/CN216928420U/en active Active
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