CN214012876U - Thermomagnetic release of moulded case circuit breaker - Google Patents
Thermomagnetic release of moulded case circuit breaker Download PDFInfo
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- CN214012876U CN214012876U CN202021601176.XU CN202021601176U CN214012876U CN 214012876 U CN214012876 U CN 214012876U CN 202021601176 U CN202021601176 U CN 202021601176U CN 214012876 U CN214012876 U CN 214012876U
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Abstract
The utility model provides a moulded case circuit breaker's thermomagnetic formula release which characterized in that: the bimetallic strip (3) is fixed on the thermal element (2), one end of the coil (1) is connected with the contact plate (8), the other end of the coil is connected with the thermal element (2), one end of the first flexible connection (5) is connected with the thermal element (2), the other end of the first flexible connection (5) is connected with the movable contact (4), one end of the second flexible connection (6) is connected with the contact plate (8), the other end of the second flexible connection (6) is connected with the movable contact (4), and the middle of the second flexible connection (6) is connected with the current-limiting resistor (7). The thermomagnetic release can effectively shunt short-circuit current when passing through the main circuit, prevent the coil from being damaged due to overlarge current, effectively protect the circuit and equipment, save cost, and effectively reduce the internal resistance of the main circuit and facilitate reducing temperature rise due to the parallel connection of the two branches.
Description
Technical Field
The invention belongs to the technical field of releases, and particularly relates to a thermomagnetic release of a molded case circuit breaker.
Background
The thermomagnetic trip is an important component of the molded case circuit breaker, plays the roles of overload protection and short-circuit protection in the whole circuit breaker, and has stable and reliable performance and wide application. In the existing release of the circuit breaker, when an overload current exists in a circuit, a thermal protection element bimetallic strip is heated and deformed to push a traction rod, so that an operating mechanism acts to break the circuit; when short-circuit current exists in the circuit, the electromagnetic system generates electromagnetic force, and the armature moves to actuate the traction rod, so that the operating mechanism acts to disconnect the circuit. When short-circuit current appears in the prior art scheme, the short-circuit current completely passes through the thermal element and the coil, the phenomena of thermal element deformation and coil breaking occur, and the protection effect on the circuit is lost.
Chinese patent ZL201620134560.0 discloses a thermomagnetic trip device of a circuit breaker, which includes: the armature is rotatably fixed on the inner side of the iron core through the support, a counter-force spring is further arranged between the armature and the support, a bimetallic strip is arranged between the support and the armature, the lower end of the bimetallic strip is connected and fixed with a contact system through a connecting plate, a combined bolt matched with a tripping mechanism is arranged at the upper end of the bimetallic strip, and the bimetallic strip is connected with a connecting plate through a flexible connection. The bimetallic strip of the thermomagnetic trip device of the circuit breaker is directly connected with the connecting plate and the bimetallic strip through a flexible connection in a current heating mode to be suitable for circuits with different current specifications. However, although the short-circuit current in the technical scheme has certain short-time heat resistance, the short-circuit current completely passes through the thermal element and the coil, all the coils are uniformly wound before the short-circuit test, and after the short-circuit test, the coils are stacked and extruded and are arranged disorderly, so that the coil is seriously damaged. The current is large under the condition of short circuit, the electromagnetic force of a release system is increased rapidly, the phenomena of thermal element deformation and coil breaking occur, the coil can be fused under the condition of large short circuit current, and the circuit and equipment can not be protected effectively. Moreover, the product is easy to damage, the replacement rate is frequent, and the product cost is increased. Meanwhile, when the current-limiting resistor is increased to a certain degree, the temperature rise is too high, and the security requirement cannot be met.
SUMMERY OF THE UTILITY MODEL
The invention aims to solve the technical defects of the conventional thermomagnetic trip device, and provides the thermomagnetic trip of the molded case circuit breaker, wherein short-circuit current can be effectively shunted when passing through a main circuit, so that coil damage caused by overlarge current is prevented, the circuit and equipment are effectively protected, the cost is saved, and meanwhile, two branches are connected in parallel, so that the internal resistance of the main circuit is effectively reduced, and the temperature rise is favorably reduced.
Technical scheme
In order to realize the technical purpose, the utility model provides a pair of moulded case circuit breaker's thermomagnetic formula release, its characterized in that: the coil is fixed on the thermal element, one end of the coil is connected with the contact plate 8, the other end of the coil is connected with the thermal element, one end of the flexible connection I is connected with the thermal element, the other end of the flexible connection I is connected with the movable contact, one end of the flexible connection II is connected with the contact plate, the other end of the flexible connection II is connected with the movable contact, and the middle of the flexible connection II is connected with the current-limiting resistor.
Further, the support member is connected to the bimetal and the thermal element.
Furthermore, one end of the coil is welded with the thermal element, the other end of the coil is welded with the contact plate, one end of the first flexible connection is welded with the thermal element, the other end of the first flexible connection is welded with the moving contact, one end of the second flexible connection is welded with the contact plate, the other end of the second flexible connection is welded with the moving contact, and the middle of the second flexible connection is welded with the current limiting resistor.
Furthermore, the support piece, the bimetallic strip and the thermal element are connected in a riveting manner.
Advantageous effects
The utility model provides a pair of moulded case circuit breaker's thermomagnetic formula release can effectively shunt when the short-circuit current passes through the main circuit, prevents that the electric current from too big coil damage that causes, and effective protection circuit and equipment practice thrift the cost, and two branches are parallelly connected simultaneously, effectively reduce the main circuit internal resistance, are favorable to reducing the temperature rise.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clear and obvious, the following is a detailed description of the features and exemplary embodiments of the present invention. It is understood that the following description of the specific embodiments is merely illustrative of the invention, which can be implemented by those skilled in the art without some of these details. In the drawings and the following description, well-known techniques and structures are not described in detail in order to avoid unnecessarily obscuring the present invention. The following describes one embodiment of a thermomagnetic trip of a molded case circuit breaker according to the present invention with reference to the accompanying drawings.
Examples
As shown in fig. 1, the present embodiment provides a thermomagnetic trip of a molded case circuit breaker, including a coil 1, a thermal element 2, a bimetal 3, a movable contact 4, a first flexible connection 5, a second flexible connection 6, a current-limiting resistor 7 and a contact plate 8, where the bimetal 3 is fixed on the thermal element 2, and a support 9 is connected to the bimetal 3 and the thermal element 2. One end of the coil 1 is connected with the contact plate 8, the other end of the coil is connected with the thermal element 2, one end of the first flexible connection 5 is connected with the thermal element 2, the other end of the first flexible connection is connected with the moving contact 4, one end of the second flexible connection 6 is connected with the contact plate 8, the other end of the second flexible connection 6 is connected with the moving contact 4, and the middle of the second flexible connection 6 is connected with the current limiting resistor 7.
Specifically, in this embodiment, the support member 9 is fixedly connected to the bimetal 3 and the thermal element 2 by riveting. One end of the coil 1 is welded with the thermal element 2, the other end of the coil is welded with the contact plate 8, one end of the first flexible connection 5 is welded with the thermal element 2, the other end of the first flexible connection 5 is welded with the movable contact 4, one end of the second flexible connection 6 is welded with the contact plate 8, the other end of the second flexible connection 6 is welded with the movable contact 4, and the middle of the second flexible connection 6 is welded with the current limiting resistor 7.
The shunt principle of the parallel circuit is adopted in the embodiment, a parallel branch is newly added in the conducting system, the internal resistance value of the newly added branch can be adjusted according to the requirement, and the purposes of short circuit shunt and no fusing of the coil are achieved. In addition, the thermal element is riveted with the supporting piece, and the supporting piece is fixed on the base, so that the purpose that the release is integrally fixed on the base is achieved, and the phenomenon that the coil is broken due to overlarge electromagnetic force and unfixed position of the release under the condition of short circuit is avoided.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. The utility model provides a moulded case circuit breaker's thermomagnetic formula release which characterized in that: the coil comprises a coil (1), a thermal element (2), a bimetallic strip (3), a movable contact (4), a flexible connection I (5), a flexible connection II (6), a current limiting resistor (7) and a contact plate (8), wherein the bimetallic strip (3) is fixed on the thermal element (2), one end of the coil (1) is connected with the contact plate (8), the other end of the coil is connected with the thermal element (2), one end of the flexible connection I (5) is connected with the thermal element (2), the other end of the flexible connection I (3) is connected with the movable contact (4), one end of the flexible connection II (6) is connected with the contact plate (8), the other end of the flexible connection II (6) is connected with the movable contact (4), and the middle of the flexible connection II (6) is connected with the current limiting resistor (7).
2. The thermo-magnetic type trip unit of the molded case circuit breaker according to claim 1, wherein: the support piece (9) is connected with the bimetallic strip (3) and the thermal element (2).
3. The thermo-magnetic type trip unit of the molded case circuit breaker according to claim 1, wherein: one end of the coil (1) is welded with the thermal element (2), the other end of the coil is welded with the contact plate (8), one end of the first flexible connection (5) is welded with the thermal element (2), the other end of the first flexible connection is welded with the movable contact (4), one end of the second flexible connection (6) is welded with the contact plate (8), the other end of the second flexible connection is welded with the movable contact (4), and the middle of the second flexible connection (6) is welded with the current limiting resistor (7).
4. The thermo-magnetic type trip unit of the molded case circuit breaker according to claim 2, wherein: the support piece (9), the bimetallic strip (3) and the thermal element (2) are connected in a riveting manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021601176.XU CN214012876U (en) | 2020-08-04 | 2020-08-04 | Thermomagnetic release of moulded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021601176.XU CN214012876U (en) | 2020-08-04 | 2020-08-04 | Thermomagnetic release of moulded case circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214012876U true CN214012876U (en) | 2021-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021601176.XU Active CN214012876U (en) | 2020-08-04 | 2020-08-04 | Thermomagnetic release of moulded case circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214012876U (en) |
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2020
- 2020-08-04 CN CN202021601176.XU patent/CN214012876U/en active Active
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