Thermomagnetic system of circuit breaker

Abstract

The utility model relates to a thermomagnetic system of a circuit breaker, which comprises an overload element, a heating element arranged on one side of the overload element, an armature bracket arranged on one side of the heating element, a static iron core arranged on one side of the armature bracket, and a short circuit element arranged on the other side of the overload element, the overload element, the heating element, the armature support and the static iron core are provided with corresponding notches, and fasteners are connected between the notches. According to the utility model, the overload element, the heating element, the armature support, the static iron core, the short-circuit element and other components are designed into modules which can be independently installed and connected, so that the assembly and maintenance of the whole thermomagnetic system are more convenient, and a proper gap is arranged between the overload element and the heating element. And by utilizing the corresponding notches formed between the heat dissipation plates, the heat dissipation path of the system can be optimized, and the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a thermal magnetic system of a circuit breaker. Background Art

[0002] In the power system, as a key protection device, the performance of a circuit breaker is directly related to the safe and stable operation of the power system. As an important type of circuit breaker, the molded case circuit breaker is widely used in various power distribution systems and motor protection due to its compact structure, convenient installation, and reliable performance. The core of the molded case circuit breaker lies in its thermal magnetic system, which integrates two major functions of overload protection and short-circuit protection. It can quickly cut off the circuit when an abnormal situation occurs in the circuit, preventing safety accidents such as equipment damage and fire. However, there are some deficiencies in the design of the traditional thermal magnetic system of the molded case circuit breaker, such as complex structure, difficult assembly, poor thermal stability, etc. These problems not only increase the manufacturing cost and maintenance difficulty, but also may affect the protection performance and reliability of the circuit breaker. Summary of the Utility Model

[0003] In view of this, the purpose of the utility model is to provide a thermal magnetic system of a circuit breaker with a simple structure, convenient assembly, and good thermal stability.

[0004] To achieve the above purpose, the utility model adopts such a thermal magnetic system of a circuit breaker, which includes an overload element, a heating element arranged on one side of the overload element, an armature bracket arranged on one side of the heating element, a static iron core arranged on one side of the armature bracket, and a short-circuit element arranged on the other side of the overload element. Corresponding notches are opened in the overload element, the heating element, the armature bracket, and the static iron core, and fasteners are connected between the notches.

[0005] The utility model is further provided that the fastener is a rivet.

[0006] Compared with the prior art, the beneficial effect of the above structure is that by designing components such as the overload element, the heating element, the armature bracket, the static iron core, and the short-circuit element as modules that can be independently installed and connected, the assembly and maintenance of the entire thermal magnetic system are more convenient. And by setting an appropriate gap between the overload element and the heating element, and using the corresponding notches opened between them, the heat dissipation path of the system can be optimized, and the heat dissipation efficiency can be improved.

[0007] The utility model is further provided that the overload element has a first connection part connected to the fastener and an adjustment part arranged at one end of the first connection part. The first connection part and the adjustment part are connected by a first inclined surface. A screw hole is opened in the adjustment part, and an adjustment piece is installed in the screw hole.

[0008] The utility model is further provided that the adjustment piece is a screw.

[0009] In the above technical solution, by rotating and moving the screw in the screw hole, the adjustment of the position of the special-shaped traction rod can be indirectly affected, thereby controlling the trigger threshold of the overload element, ensuring that the circuit breaker can accurately respond under different working conditions, avoiding misoperation or delayed operation, and improving the stability and reliability of the system.

[0010] This utility model is further configured such that the heating element has a second connecting portion connected to the fastener, a vertical portion horizontally extending from the second connecting portion and vertically bending toward the overload element side, and a bending portion horizontally extending from the second connecting portion and bending downward. A current-limiting groove is also provided on the second connecting portion, and a mounting groove is provided on the vertical portion.

[0011] In the above technical solution, the design of the vertical portion and the bending portion of the heating element helps to increase its surface area, thereby improving the heat dissipation efficiency. The vertical portion vertically bends toward the overload element side, which is beneficial for guiding heat to a specific heat dissipation path, while the bending portion promotes convective heat dissipation by increasing the space for air flow, helps to reduce the working temperature of the heating element, and extends its service life. The current-limiting groove provided on the second connecting portion has the effect of restricting the concentrated flow of current in certain areas, thereby helping to optimize the current distribution and reduce the occurrence of local overheating.

[0012] This utility model is further configured such that the armature bracket is of a U-shaped structure. The armature bracket has a third connecting portion connected to the fastener, a first special-shaped portion horizontally extending from the third connecting portion toward the heating element side and bending downward, and a second special-shaped portion horizontally extending from the third connecting portion on the opposite side of the heating element and bending downward. A positioning hole is provided on the first special-shaped portion, and a long waist slot and a spring catch are respectively provided on the second special-shaped portion. The position of the positioning hole corresponds to that of the long waist slot.

[0013] This utility model is further configured such that the spring catch includes a first spring catch provided on one side of the long waist slot and a second spring catch provided on one side of the first spring catch.

[0014] In the above technical solution, by adopting a U-shaped structure for the armature bracket, not only good supporting force is provided, but also its structural stability is significantly enhanced. In addition, the positioning hole provided on the first special-shaped portion corresponds to the position of the long waist slot on the second special-shaped portion, allowing precise positioning and adjustment during the assembly process. The spring catch designed on the second special-shaped portion includes a first spring catch and a second spring catch, which not only ensures the stability and reliability of the short-circuit action spring during operation, prevents the short-circuit action spring from falling off, but also is used to select to hang the short-circuit action spring on the first spring catch when the current is large to provide a stronger spring force to meet the working requirements under large current, while when the current is small, the short-circuit action spring can be selected to be hung on the second spring catch to reduce the spring force.

[0015] The present utility model is further configured such that the static iron core has a U-shaped structure, and the static iron core has a fourth connecting portion connected to the fastener, a left side plate portion horizontally extending from one side of the fourth connecting portion facing the armature bracket, and a right side plate portion horizontally extending from the other side of the fourth connecting portion facing the opposite side of the armature bracket. The left side plate portion contacts the outer side wall of the first special-shaped portion, and the right side plate portion contacts the outer side wall of the second special-shaped portion.

[0016] In the above technical solution, by adopting a U-shaped structure for the static iron core, which corresponds to the U-shaped structure of the armature bracket, a stable support framework is formed, not only enhancing the structural stability of the static iron core itself, but also further improving the stability of the entire electromagnetic system through close contact with the armature bracket. Its left side plate portion contacts the outer side wall of the first special-shaped portion, and the right side plate portion contacts the outer side wall of the second special-shaped portion, which helps to disperse and resist external impacts and vibrations, ensuring the stable operation of the electromagnetic system in a complex working environment.

[0017] The present utility model is further configured such that the short-circuit element has a flat plate portion and a plug-in portion provided at one end of the flat plate portion. The flat plate portion and the plug-in portion are connected by a second inclined surface. First plug-in blocks with plug-in positioning holes and second plug-in blocks with plug-in long waist slots are respectively formed by outward extension on both sides of the plug-in portion. The plug-in portion extends downward and bends at one end close to the second plug-in block to form a hook portion. The hook portion is inclined towards the overload element, and a hook groove is formed on the hook portion. A short-circuit action spring is connected between the hook groove and the spring hook. The plug-in portion extends downward and bends at one end close to the first plug-in block to form a special-shaped traction rod.

[0018] In the above technical solution, the short-circuit element adopts a design combining a flat plate portion and a plug-in portion, and is connected by a second inclined surface, making the plug-in process smooth and unobstructed, reducing the assembly difficulty. First plug-in blocks with plug-in positioning holes and second plug-in blocks with plug-in long waist slots are respectively extended on both sides of the plug-in portion, realizing precise positioning and flexible adjustment with the armature bracket. The plug-in portion extends downward and bends at one end close to the first plug-in block to form a hook portion. The hook portion not only inclines towards the overload element side, providing a good guiding function, but also is connected with a short-circuit action spring between the hook groove and the spring hook, greatly enhancing the connection reliability between the short-circuit element and the armature bracket. At the same time, a special-shaped traction rod is also provided on the plug-in portion, facilitating flexible adjustment of the short-circuit element when needed.

[0019] The present utility model is further configured such that the armature bracket is made of a magnetic isolation material.

[0020] In the above technical solution, the magnetic isolation material can effectively block the propagation of the magnetic field in the bracket, thereby preventing the bracket itself from becoming part of the magnetic circuit and reducing interference with the performance of the electromagnet. Description of the Drawings

[0021] Figure 1 is a three-dimensional schematic diagram of an embodiment of the present utility model.

[0022] Figure 2 is an exploded schematic diagram of an embodiment of the present utility model.

[0023] Figure 3 is a schematic diagram of the structure of an overload element of an embodiment of the present utility model.

[0024] Figure 4 is a schematic diagram of the structure of a heating element of an embodiment of the present utility model.

[0025] Figure 5 is a schematic diagram of the structure of an armature bracket of an embodiment of the present utility model.

[0026] Figure 6 is a schematic diagram of the structure of a static iron core of an embodiment of the present utility model.

[0027] Figure 7 is a schematic diagram of the structure of a short-circuit element of an embodiment of the present utility model. Detailed implementation manners

[0028] As Figures 1-7 shown, an embodiment of the present utility model provides a thermal-magnetic system of a circuit breaker, including an overload element 1, a heating element 2 arranged on one side of the overload element 1, an armature bracket 3 arranged on one side of the heating element 2, a static iron core 4 arranged on one side of the armature bracket 3, and a short-circuit element 5 arranged on the other side of the overload element 1. Corresponding notches 10 are provided on the overload element 1 and the heating element 2, and between the armature bracket 3 and the static iron core 4. The notches 10 are connected by rivets 6.

[0029] As Figure 3 shown, the overload element 1 has a first connection portion 11 connected to the rivet 6 and an adjustment portion 12 provided at one end of the first connection portion 11. The first connection portion 11 and the adjustment portion 12 are connected by a first inclined surface 13. A screw hole 121 is provided on the adjustment portion 12, and a screw (not shown in the figure) is installed in the screw hole 121.

[0030] As Figure 4 shown, the heating element 2 has a second connection portion 21 connected to the rivet 6, a vertical portion 22 horizontally extending from the second connection portion 21 and vertically bent toward the overload element 1, and a bent portion 23 horizontally extending from the second connection portion 21 and bent downward. A current-limiting groove 211 is further provided on the second connection portion 21, and a mounting groove 221 is provided on the vertical portion 22.

[0031] As Figure 5As shown, the armature bracket 3 is of a U-shaped structure. The armature bracket 3 has a third connecting portion 31 connected to the rivet 6, a first special-shaped portion 32 that horizontally extends from the side of the third connecting portion 31 facing the heating element 2 and then bends downward, and a second special-shaped portion 33 that horizontally extends from the side of the third connecting portion 31 opposite to the side facing the heating element 2 and then bends downward. A positioning hole 34 is provided on the first special-shaped portion 32, and a long waist slot 35 and a spring catch 36 are respectively provided on the second special-shaped portion 33. The positions of the positioning hole 34 and the long waist slot 35 correspond to each other. The spring catch 36 includes a first spring catch 361 provided on one side of the long waist slot 35 and a second spring catch 362 provided on one side of the first spring catch 361. The armature bracket 3 is made of a magnetic isolation material.

[0032] As Figure 6 shown, the static iron core 4 is of a U-shaped structure. The static iron core 4 has a fourth connecting portion 41 connected to the rivet 6, a left side plate portion 42 that horizontally extends from the side of the fourth connecting portion 41 facing the armature bracket 3, and a right side plate portion 43 that horizontally extends from the side of the fourth connecting portion 41 opposite to the side facing the armature bracket 3. The left side plate portion 42 contacts the outer side wall of the first special-shaped portion 32, and the right side plate portion 43 contacts the outer side wall of the second special-shaped portion 33.

[0033] As Figure 7 shown, the short-circuit element 5 has a flat plate portion 51 and a plug-in portion 52 provided at one end of the flat plate portion 51. The flat plate portion 51 and the plug-in portion 52 are connected by a second inclined surface 53. First plug-in blocks 54 for plugging into the positioning hole 34 and second plug-in blocks 55 for plugging into the long waist slot 35 are respectively formed by outward extension on both sides of the plug-in portion 52. A hook portion 56 is formed by downward extension and bending at one end of the plug-in portion 52 close to the second plug-in block 55. The hook portion 56 inclines towards the side of the overload element 1, and a hook groove 561 is provided on the hook portion 56. A short-circuit action spring (not shown in the figure) is connected between the hook groove 561 and the spring catch 36. An irregular traction rod 57 is formed by downward extension and bending at one end of the plug-in portion 52 close to the first plug-in block 54. The irregular traction rod 57 includes a starting portion 571 and a turning portion 572 connected to the end of the starting portion 571. The starting portion 571 extends downward and inclines towards the side of the overload element 1. The turning portion 572 follows the starting portion 571, extends downward and inclines towards the side opposite to the overload element 1, forming the final completed shape.

[0034] Of course, in addition to the above embodiments, the present utility model can also have many other embodiments. Without departing from the substantial technical solution content of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model. And if these changes or deformations are equivalent to the technical solutions in this patent, then these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A thermal magnetic system for a circuit breaker, characterized in that: It includes an overload element, a heating element arranged on one side of the overload element, an armature bracket arranged on one side of the heating element, a static iron core arranged on one side of the armature bracket, and a short-circuit element arranged on the other side of the overload element. The overload element and the heating element as well as the armature bracket and the static iron core are all provided with corresponding slots, and fasteners are connected between the slots.

2. The thermal magnetic system of the circuit breaker according to claim 1, characterized in that: The overload element comprises a first connection part connected to the fastener and an adjusting part arranged at one end of the first connection part, the first connection part and the adjusting part are connected via a first inclined surface, a screw hole is provided on the adjusting part, and an adjusting piece is installed in the screw hole.

3. The thermal magnetic system of the circuit breaker according to claim 1 or 2, characterized in that: The heating element comprises a second connection part connected to the fastener, a vertical part extending horizontally from the second connection part and bending vertically toward one side of the overload element, and a bending part extending horizontally from the second connection part and bending downward. A limiting flow groove is also provided on the second connection part, and a mounting groove is provided on the vertical part.

4. The thermal magnetic system of the circuit breaker according to claim 3, characterized in that: The armature bracket is a U-shaped structure, and the armature bracket has a third connecting portion connected to the fastener, a first special-shaped portion horizontally extending from the third connecting portion toward one side of the heating element and bending downward, and a second special-shaped portion horizontally extending from the third connecting portion toward the other side opposite to the heating element and bending downward, a positioning hole is provided on the first special-shaped portion, and a long waist groove and a spring hook are respectively provided on the second special-shaped portion, and the positioning hole corresponds to the position of the long waist groove.

5. The thermal magnetic system of the circuit breaker according to claim 4, characterized in that: The spring hook comprises a first spring hook arranged on one side of the long waist groove and a second spring hook arranged on one side of the first spring hook.

6. The thermal magnetic system of the circuit breaker according to claim 4 or 5, characterized in that: The static iron core is a U-shaped structure, and has a fourth connecting portion connected to a fastener, a left plate portion horizontally extending from the fourth connecting portion to one side of the armature bracket, and a right plate portion horizontally extending from the fourth connecting portion to the other side opposite to the armature bracket, wherein the left plate portion contacts the outer side wall of the first special-shaped portion, and the right plate portion contacts the outer side wall of the second special-shaped portion.

7. The thermal magnetic system of the circuit breaker according to claim 6, characterized in that: The short-circuit element comprises a flat plate portion and a plug-in portion arranged at one end of the flat plate portion, the flat plate portion and the plug-in portion are connected via a second inclined surface, both sides of the plug-in portion extend outward to form a first plug-in block with a plug-in positioning hole and a second plug-in block with a plug-in long waist groove, the plug-in portion extends downward and bends at one end close to the second plug-in block to form a hook portion, the hook portion is inclined toward one side of the overload element, a hook groove is provided on the hook portion, a short-circuit action spring is connected between the hook groove and the spring hook, and the plug-in portion extends downward and bends at one end close to the first plug-in block to form a special-shaped traction rod.

8. The thermal magnetic system of a circuit breaker according to claim 4, characterized in that: The armature bracket is made of magnetic isolation material.

9. The thermal magnetic system of a circuit breaker according to claim 1, characterized in that: The fastener is a rivet.

10. The thermal magnetic system of a circuit breaker according to claim 2, characterized in that: The adjusting member is a screw.

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