A molded case circuit breaker

Abstract

The application relates to the technical field of molded case circuit breakers, in particular to a molded case circuit breaker, which comprises a circuit breaker shell, a plurality of conductive systems installed in the circuit breaker shell, the conductive system comprising a connecting piece, a heating piece and a double gold piece, the connecting piece, the heating piece and the double gold piece being fixedly connected in sequence, each conductive system being abutted with an iron core on one side, each iron core being fixedly connected with an iron core support on the outer side, a plurality of limiting grooves being arranged in the circuit breaker shell, the outer side surface of each iron core support being slidably connected with the inner wall of each limiting groove, each iron core being fixedly connected with a first clamping ring on the lower side, and each first clamping ring being screwedly connected with an adjusting screw on the lower side. Through the above technical scheme, the heights of the conductive systems installed in the circuit breaker shell are kept consistent, and the connecting precision between the conductive system and the release is improved.

Description

Technical Field

[0001] This invention relates to the field of molded case circuit breaker technology, specifically to molded case circuit breakers. Background Technology

[0002] A molded case circuit breaker (MCCB) is a protective device used in power systems. Its main function is overload and short-circuit protection, automatically disconnecting the circuit to prevent damage to equipment and lines due to overcurrent. The structure of a typical MCB generally includes a housing, operating mechanism, current sensor for monitoring current magnitude, trip unit, conductive system, and stationary contacts. The trip unit automatically disconnects the circuit through the magnetic force generated by the high current in the conductive system. Therefore, in an MCB, the conductive system must be stably installed to ensure the stable operation of the trip unit.

[0003] To maintain the stability of the circuit breaker, the connection accuracy between the conductive system and the trip unit needs to be ensured, so that the input and output of the overall conductive system remain stable. In the existing technology, when installing the conductive system in the circuit breaker housing, the conductive system is bent to give it sufficient cross-sectional area to prevent it from being burned out by excessive voltage. The bent part also abuts against the slot in the circuit breaker housing, thereby improving the connection accuracy between the conductive system and the trip unit. However, the above technology still has technical problems. The bending effect of the conductive system will deform during installation. In order to ensure the connection strength between the conductive system and the circuit breaker housing, workers usually use a rubber mallet to knock the conductive system into the circuit breaker housing. This will cause the height of the conductive system in different positions to be inconsistent, thus affecting the connection accuracy between the conductive system and the trip unit. Summary of the Invention

[0004] This invention proposes a molded case circuit breaker that maintains a consistent height for each conductive system installed in the circuit breaker housing, thereby improving the connection accuracy between the conductive system and the trip unit.

[0005] The technical solution of the present invention is as follows:

[0006] A molded case circuit breaker includes a circuit breaker housing and a plurality of conductive systems installed within the circuit breaker housing;

[0007] The conductive system includes a connector, a heating element, and a bimetallic component. The connector is fixedly connected to the heating element, and the heating element is welded to the bimetallic component.

[0008] Each conductive system has an iron core abutting on one side, and an iron core bracket is fixedly connected to the outside of each iron core.

[0009] The circuit breaker housing is provided with several limiting grooves, and the outer side of each iron core bracket is slidably connected to the inner wall of each limiting groove.

[0010] Each iron core is fixedly connected to a first locking ring on its lower side, and each first locking ring is threadedly connected to an adjusting screw on its lower side.

[0011] A locking block is slidably connected inside the circuit breaker housing. The locking block is slidably connected to the circuit breaker housing. Several second locking rings are fixedly connected to the locking block. Each second locking ring abuts against each first locking ring. A locking screw is threadedly connected to one side of the locking block. The locking screw is rotatably engaged with the circuit breaker housing.

[0012] Furthermore, a quick-connect bracket is connected to the outside of the circuit breaker housing to facilitate workers to quickly assemble and disassemble the circuit breaker. The quick-connect bracket includes a support plate, and several support rods are fixedly connected to one side of the support plate. A linkage plate is rotatably connected to each of the support rods. A locking component for limiting the linkage plates on both sides is connected between two linkage plates. A locking door plate is fixedly connected to the end of each linkage plate away from the locking component.

[0013] The side of the support plate away from the support rod is connected to a reset assembly that works with the locking door panel to quickly assemble and disassemble the circuit breaker housing.

[0014] Furthermore, the reset assembly includes two support columns, both of which are slidably connected to a support plate. A first connecting plate is fixedly connected to one end of each support column away from the support plate. A second connecting plate is slidably connected to one end of the first connecting plate away from the support column. The second connecting plate is fixedly connected to the outer side of the circuit breaker housing. A reset spring is fitted on each support column, and both ends of each reset spring abut against the support plate and the first connecting plate, respectively.

[0015] Each of the aforementioned slot doors has two slots, and each of the aforementioned slots has a slot pin that slides against the narrow inner wall of the slot. Each of the aforementioned slot pins is fixedly connected to the outside of the circuit breaker housing.

[0016] Each locking pin is threaded with a locking nut, and the width of the inner wall of each locking groove is greater than the outer diameter of the locking nut.

[0017] Furthermore, the positioning assembly includes two supporting plates, each of which is rotatably connected to an adjacent linkage plate. A supporting column is slidably connected between the two supporting plates, and a positioning spring is sleeved on the supporting column. The two ends of the positioning spring abut against the supporting plates on both sides respectively.

[0018] Furthermore, a guide plate that slopes downward toward the support rod is fixedly connected to the upper end of the support plate, and a drip line is provided on the lower side of the guide plate.

[0019] Furthermore, a plurality of first heat sinks are fixedly connected to the side of the support plate facing the first connecting plate;

[0020] The circuit breaker housing has several heat dissipation slots on the side facing the support plate. The width of each heat dissipation slot is greater than the width of the first heat sink, and the depth of each heat dissipation slot is greater than the length of the first heat sink.

[0021] Furthermore, a number of second heat sinks are fixedly connected to the side of the support plate near the guide plate.

[0022] Furthermore, the axial length of the support column is greater than the depth of the heat dissipation groove.

[0023] Furthermore, when the heating element is 2mm thick and 10mm long, and is used for a resistance of 600-700 microohms, the preferred material for the heating element is brass, and the suitable current is 125A.

[0024] When used for resistances of 1300-1500 microohms, the preferred material for the heating element is silicon bronze, and the suitable current is 63A.

[0025] When used for resistances of 2000-2200 microohms, the preferred material for the heating element is nickel-iron, and the suitable current is 32A.

[0026] Furthermore, when the heating element has a thickness of 1.5mm and a length of 10mm, and is used for a resistance of 800-1200 microohms, the preferred material for the heating element is brass, and the suitable current is 80-100A.

[0027] When used for resistances of 1600-1900 microohms, the preferred material for the heating element is silicon bronze, and the suitable current is 40-50A.

[0028] The beneficial effects of this invention are as follows:

[0029] By adjusting the screws, the first locking ring is limited, so that the height of all iron core brackets with iron cores is kept consistent. That is, by adjusting the screws, the height of the iron core brackets inside the circuit breaker housing is limited, so that the conductive system connected with the iron core brackets can be more accurately connected to the trip unit.

[0030] By sliding the outer side of the iron core bracket to the inner wall of each limiting groove, the conductive system restricts the five degrees of freedom of the iron core bracket under the locking action of the iron core bracket before installation. Then, tightening the locking screws drives the locking blocks to slide in the direction of the locking screws, thereby causing each second locking ring to abut against each first locking ring, thus locking each iron core bracket. Preferably, the iron core bracket is made of copper that can withstand high temperatures. Since copper is relatively expensive, iron core is used here to reduce costs. If cost is not a concern, the iron core and the iron core bracket can be made as one piece. Then, the conductive system slides along the inner wall of the iron core. The width of the conductive system is smaller than the width of the inner wall of the iron core. After the conductive system is installed, there is a gap between the conductive system and the inner wall of the iron core, so they will not come into contact. When the iron core is used for slight flipping of the horizontal plane of the circuit breaker housing, the conductive system, which is not threadedly fixed to the circuit breaker housing, will not shift arbitrarily under the abutment and limiting action of the iron core side, which improves the stability of the conductive system installation and facilitates the installation by the installer.

[0031] Quick-connect brackets allow workers to stably position the equipment during commissioning and enable maintenance personnel to quickly disassemble and reassemble it during equipment replacement and maintenance. This simplifies maintenance work, reduces workload, and increases efficiency. Furthermore, it ensures the stability of the circuit breaker housing, eliminating the need for additional screws and simplifying the installation process. It also partially blocks loose wall plaster and mold, reducing dust pollution among maintenance personnel and ensuring their health. Finally, it further dissipates the high temperatures generated by the circuit breaker, improving its heat dissipation and extending the lifespan of the conductive system and components. Attached Figure Description

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] Figure 1 This is an enlarged schematic diagram of the present invention;

[0034] Figure 2 This is a partial enlarged schematic diagram of the present invention;

[0035] Figure 3 This is a magnified illustration of a partial explosion of the present invention. Figure 1 ;

[0036] Figure 4 for Figure 3 Enlarged diagram of A in the middle;

[0037] Figure 5 This is a magnified illustration of a partial explosion of the present invention. Figure 2 ;

[0038] Figure 6 This is a magnified illustration of a partial explosion of the present invention. Figure 3 ;

[0039] Figure 7 This is a magnified illustration of a partial explosion of the present invention. Figure 4 ;

[0040] Figure 8 for Figure 1 Enlarged diagram of B in the middle;

[0041] Figure 9 This is an enlarged schematic diagram of the circuit breaker housing of the present invention.

[0042] In the diagram: 11. Circuit breaker housing; 12. Conductive system; 121. Connector; 122. Heating element; 123. Bimetallic component; 14. Limiting groove; 15. Heat dissipation groove; 16. Adjusting screw; 21. Iron core; 22. Iron core bracket; 23. First locking ring; 24. Locking block; 25. Second locking ring; 26. Locking screw; 31. Support plate; 32. Support rod; 33. Linkage plate; 34. Locking door panel; 341. Locking groove; 41. Support column; 42. First connecting plate; 43. Second connecting plate; 44. Return spring; 45. Locking pin; 46. Locking nut; 51. Support plate; 52. Support column; 53. Locking spring; 61. Guide plate; 62. Drip line; 71. First heat sink; 72. Second heat sink. Detailed Implementation

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] Example 1

[0045] like Figures 1-9As shown, this embodiment proposes a molded case circuit breaker, including a circuit breaker housing 11 and a plurality of conductive systems 12 installed inside the circuit breaker housing 11. Each conductive system 12 includes a connector 121, a heating element 122, and a bimetallic component 123. The connector 121, the heating element 122, and the bimetallic component 123 are sequentially fixedly connected. Preferably, the heating element 122 and the bimetallic component 123 are connected by welding. One side of each conductive system 12 abuts against each iron core 21. The outer side of each iron core 21 is fixedly connected to each iron core support 22. A plurality of limiting grooves 14 are formed inside the circuit breaker housing 11. The outer side of each iron core support 22 is slidably connected to the inner wall of each limiting groove 14. The lower side of each iron core 21 is fixedly connected to each first locking ring 23. The lower side of each first locking ring 23 is threadedly connected to each adjusting screw 16. By adjusting the screw 16, the position of the first locking ring 23 is limited, thereby ensuring that the height of all iron core supports 22 with iron cores 21 is consistent. Adjusting screw 16 limits the height of core bracket 22 within circuit breaker housing 11, ensuring that conductive system 12, which is connected to core bracket 22, can more accurately connect with trip unit.

[0046] Example 2

[0047] Example 2 improves upon Example 1 by modifying the first locking ring 23.

[0048] like Figures 1-9 As shown, the locking block 24 is slidably connected inside the circuit breaker housing 11. The locking block 24 is slidably connected to the circuit breaker housing 11. Several second locking rings 25 are fixedly connected to the locking block 24. Each second locking ring 25 abuts against each first locking ring 23. One side of the locking block 24 is threadedly connected to the locking screw 26. The locking screw 26 is rotatably locked to the circuit breaker housing 11.

[0049] A quick-connect bracket, which facilitates workers to quickly install and remove the circuit breaker, is connected to the outside of the circuit breaker housing 11.

[0050] The quick-connect bracket includes a support plate 31, one side of which is fixedly connected to several support rods 32. Each linkage plate 33 is rotatably connected to each support rod 32. A locking component for limiting the linkage plates 33 on both sides is connected between two linkage plates 33. The end of each linkage plate 33 away from the locking component is fixedly connected to each locking door panel 34.

[0051] The side of the support plate 31 away from the support rod 32 is connected to the reset assembly of the circuit breaker housing 11 for quick assembly and disassembly of the locking door plate 34.

[0052] By sliding between the outer side of the iron core bracket 22 and the inner wall of each limiting groove 14, the conductive system 12 restricts the five degrees of freedom of the iron core bracket 22 under the locking action of the iron core bracket 22 before installation. Then, the locking screw 26 is tightened, which drives the locking block 24 to slide in the direction of the locking screw 26, thereby causing each second locking ring 25 to abut against each first locking ring 23, thus locking each iron core bracket 22. Preferably, the iron core bracket 22 is made of copper that can withstand high temperatures. Since copper is relatively expensive, an iron core 21 is used here to support it in order to reduce costs. Under this premise, the iron core 21 and the iron core support 22 can be made into one piece. Then, the conductive system 12 slides along the inner wall of the iron core 21. The width of the conductive system 12 is smaller than the width of the inner wall of the iron core 21. After the conductive system 12 is installed, there is a gap between the conductive system 12 and the inner wall of the iron core 21 so that they will not come into contact. When the iron core 21 is used for a slight flip in the horizontal plane of the circuit breaker housing 11, the conductive system 12, which is not threadedly fixed to the circuit breaker housing 11, will not shift arbitrarily under the abutment and limiting action of the side of the iron core 21. This improves the stability of the conductive system installation and makes it convenient for installers to install it.

[0053] A quick-connect bracket, which facilitates workers to quickly install and remove the circuit breaker, is connected to the outside of the circuit breaker housing 11.

[0054] Quick-connect brackets allow workers to stably position the equipment during commissioning and enable maintenance personnel to quickly disassemble and reassemble it during equipment replacement and maintenance. This simplifies maintenance work, reduces workload, and improves efficiency. It also ensures the installation stability of the circuit breaker housing 11, eliminating the need for additional screws and simplifying the installation process. Furthermore, it partially blocks loose wall plaster and mold, reducing dust pollution among maintenance personnel and ensuring their health. Finally, it further dissipates the high temperatures generated by the circuit breaker, improving its heat dissipation effect and extending the service life of the conductive system 12 within the circuit breaker.

[0055] like Figure 1 and Figures 6-9 As shown, the quick-connect bracket includes a support plate 31, one side of which is fixedly connected to several support rods 32. Each linkage plate 33 is rotatably connected to each support rod 32. A locking component for limiting the linkage plates 33 on both sides is connected between the two linkage plates 33. The end of each linkage plate 33 away from the locking component is fixedly connected to each locking door panel 34.

[0056] The locking assembly releases the elastic potential energy of the locking spring 53, causing the linkage plate 33, which rotates around the support rod 32, to flip. In this way, the locking door plate 34 connected to the linkage plate 33 can only switch between open and closed states, thereby helping maintenance personnel to quickly install and remove circuit breakers, reducing workload and improving work efficiency.

[0057] The reset assembly for quick disassembly and assembly of the circuit breaker housing 11, which works in conjunction with the locking door panel 34, is connected to the side of the support plate 31 away from the support rod 32.

[0058] When the reset assembly stops the worker from pressing the circuit breaker housing 11, the reset assembly and the cooperating locking door 34 can quickly and stably limit the circuit breaker housing 11, so that the circuit breaker housing 11 does not need to be connected with additional screws, simplifying the installation process and allowing the circuit breaker housing 11 to be quickly disassembled and assembled, which facilitates the worker's replacement and maintenance of the circuit breaker.

[0059] like Figure 7 As shown, the reset assembly includes two support columns 41, both of which are slidably connected to the support plate 31. The ends of the two support columns 41 away from the support plate 31 are fixedly connected to the first connecting plate 42. The ends of the first connecting plate 42 away from the support columns 41 are slidably connected to the second connecting plate 43. The second connecting plate 43 is fixedly connected to the outer side of the circuit breaker housing 11. Each reset spring 44 is sleeved on each support column 41, and the two ends of each reset spring 44 abut against the support plate 31 and the first connecting plate 42, respectively.

[0060] The sliding connection between the first connecting plate 42 and the second connecting plate 43 can serve as a temporary support for the circuit breaker housing 11, providing support during circuit breaker maintenance. This eliminates the need for workers to repeatedly disassemble and reassemble the circuit breaker under maintenance, simplifying the disassembly and assembly process, improving the efficiency of circuit breaker maintenance, and reducing the maintenance burden on workers.

[0061] Both slots 341 are opened on the slot door panel 34. The narrow inner wall of each slot 341 slides and abuts against each slot pin 45. Each slot pin 45 is fixedly connected to the outside of the circuit breaker housing 11.

[0062] Each locking pin 45 is connected to each locking nut 46 by a thread, and the width of the inner wall of each locking groove 341 is greater than the outer diameter of the locking nut 46.

[0063] Pressing on the circuit breaker housing 11 closes the locking door 34 on one side, allowing the locking door 34 on both sides to lock and limit the circuit breaker housing 11 in the middle. Then, the wider inner wall of the locking groove 341 aligns with the locking nut 46, so that the locking pin 45 engages with the locking groove 341. Then, stop pressing on the circuit breaker housing 11. Under the release of the elastic potential energy of the return spring 44, the circuit breaker housing 11 will move outward, causing the locking pin 45 to slide from the wider inner wall of the locking groove 341 to the narrower inner wall of the locking groove 341. The inner wall of the locking groove 341 limits the circuit breaker housing 11. At the same time, the locking nut 46 is larger than the narrower inner wall of the locking groove 341, making it difficult for the circuit breaker housing 11, which is mounted on the quick-connect bracket, to come off, thus ensuring the stability of the circuit breaker installation.

[0064] like Figures 6-9 As shown, the positioning assembly includes two supporting plates 51, each of which is rotatably connected to an adjacent linkage plate 33. A supporting column 52 is slidably connected between the two supporting plates 51. A positioning spring 53 is sleeved on the supporting column 52, and both ends of the positioning spring 53 abut against the supporting plates 51 on both sides.

[0065] When the locking spring 53 is released, the linkage plate 33, which rotates around the support rod 32, will flip to both sides, releasing its elastic potential energy. At this time, the locking door plate 34, which is fixedly connected to the linkage plate 33, can only be in either an open or closed state, allowing maintenance personnel to quickly disassemble and assemble the circuit breaker, facilitating maintenance workers' work, reducing workload, and improving work efficiency.

[0066] like Figures 6-7 As shown, the upper end of the support plate 31 is fixedly connected to the guide plate 61 that is inclined downward toward the support rod 32, and a drip line 62 is provided on the lower side of the guide plate 61.

[0067] Over time, walls will age and develop mold. When the wind blows, the insulation material or mold on the wall surface will fall off and settle as dust. The guide plate 61 guides this falling dust to settle along the wall, reducing its accumulation on the circuit breaker housing 11, thereby reducing the risk of maintenance workers being exposed to dust during maintenance and protecting their health.

[0068] like Figures 6-7 As shown, the support plate 31 is fixedly connected to several first heat sinks 71 on the side facing the first connecting plate 42.

[0069] Several heat dissipation grooves 15 are provided on the side of the circuit breaker housing 11 facing the support plate 31. The width of the groove opening of each heat dissipation groove 15 is greater than the width of the first heat dissipation fin 71, and the depth of each heat dissipation groove 15 is greater than the length of the first heat dissipation fin 71.

[0070] The heat dissipation groove 15 increases the contact area between the circuit breaker housing 11 and the outside air, thereby improving the heat dissipation effect of the circuit breaker. Each first heat sink 71 is embedded in the heat dissipation groove 15, further improving the heat dissipation effect of the heat dissipation groove 15.

[0071] like Figures 6-7 As shown, the support plate 31 is fixedly connected to several second heat sinks 72 on the side near the guide plate 61;

[0072] The support plate 31 is further cooled by several second heat sinks 72, so that the heat conducted on the support plate 31 by the circuit breaker can be dissipated as quickly as possible.

[0073] like Figures 6-7 As shown, the axial length of the support column 41 is greater than the depth of the heat dissipation groove 15;

[0074] After the reset spring 44 is reset, the first connecting plate 42, which is slidably connected to the second connecting plate 43, can slide outward a sufficient distance so that the first heat sink 71 can be completely removed from the heat sink 15, so that when the worker needs to remove the circuit breaker housing 11, the circuit breaker housing 11 will not interfere with the first heat sink 71.

[0075] The principle of this embodiment is as follows:

[0076] Before installation, the conductive system 12 restricts the five degrees of freedom of the iron core bracket 22 under the locking action of the iron core bracket 22. Then, the locking screw 26 is tightened, which drives the locking block 24 to slide in the direction of the locking screw 26, thereby causing each second locking ring 25 to abut against each first locking ring 23, thus locking each iron core bracket 22. Preferably, the iron core bracket 22 is made of copper that can withstand high temperature. Then, the conductive system 12 slides along the inner wall of the iron core 21. The width of the conductive system 12 is smaller than the width of the inner wall of the iron core 21. After the conductive system 12 is installed, there is a gap between the conductive system 12 and the inner wall of the iron core 21, so they will not contact each other. When the iron core 21 is used for a slight flip in the horizontal plane of the circuit breaker housing 11, the conductive system 12, which is not threadedly fixed to the circuit breaker housing 11, will not shift arbitrarily under the abutment and limiting action of the side of the iron core 21, which improves the stability of the conductive system installation and makes it convenient for installers to install it.

[0077] Then, the remaining components on the circuit breaker housing 11 are fixedly connected in sequence. After the connection is completed, the installed circuit breaker is placed on the first connecting plate 42 by the limiting sliding of the second connecting plate 43 and the first connecting plate 42 on the rear side of the circuit breaker housing 11. Then, the circuit breaker is pressed towards the support plate 31. Under the pressing action, the return spring 44 is fully compressed. Then, the other hand flips the opening locking door 34 on one side towards the circuit breaker.

[0078] When the locking spring 53 is released, the linkage plate 33, which is rotatably connected around the support rod 32, flips to both sides, so that the elastic potential energy of the locking spring 53 can be fully released, and the locking door panel 34, which is fixedly connected to the linkage plate 33, can only have two states: open and closed.

[0079] Closed state: The locking gates 34 on both sides can lock and limit the circuit breaker housing 11 in the middle. Then, the wider inner wall of the locking groove 341 is connected with the locking nut 46, so that the locking pin 45 is connected with the locking groove 341. Then, the circuit breaker housing 11 is stopped. Under the release of the elastic potential energy of the return spring 44, the circuit breaker housing 11 will move outward, so that the locking pin 45 slides from the wider inner wall of the locking groove 341 to the narrower inner wall of the locking groove 341. The inner wall of the locking groove 341 limits the circuit breaker housing 11. At the same time, the locking nut 46 is larger than the narrower inner wall of the locking groove 341, so that the circuit breaker housing 11 installed on the quick-connect bracket is not easy to fall out, thus ensuring the stability of the circuit breaker installation.

[0080] Example 3

[0081] Example 3 improves the size and material of the heating element 122 based on Example 1.

[0082] like Figures 1-9 As shown, when the heating element 122 has a thickness of 2mm and a length of 10mm, and is used for a resistance of 600-700 microohms, the preferred material for the heating element 122 is brass, and the suitable current is 125A.

[0083] When used for resistance of 1300-1500 microohms, the heating element 122 is preferably made of silicon bronze and is adapted to a current of 63A.

[0084] When used for resistances of 2000-2200 microohms, the heating element 122 is preferably made of nickel-iron alloy and is suitable for a current of 32A.

[0085] like Figures 1-9 As shown, when the heating element 122 has a thickness of 1.5mm and a length of 10mm, and is used for a resistance of 800-1200 microohms, the preferred material for the heating element 122 is brass, and the suitable current is 80-100A.

[0086] When used for resistances of 1600-1900 microohms, the heating element 122 is preferably made of silicon bronze and is suitable for currents of 40-50A.

[0087] This device is available in various specifications, which can be flexibly combined according to different usage conditions, thereby significantly improving its applicability and practicality.

[0088] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A molded case circuit breaker, comprising a circuit breaker housing (11) and a plurality of conductive systems (12) installed within the circuit breaker housing (11). Its characteristics are: The conductive system (12) includes a connector (121), a heating element (122), and a bimetallic component (123). The connector (121) is fixedly connected to the heating element (122), and the heating element (122) is welded to the bimetallic component (123). Each conductive system (12) has an iron core (21) abutting on one side, and an iron core bracket (22) is fixedly connected to the outside of each iron core (21). The circuit breaker housing (11) has several limiting grooves (14) inside, and the outer side of each iron core bracket (22) is slidably connected to the inner wall of each limiting groove (14); Each iron core (21) is fixedly connected to a first locking ring (23) on its lower side, and each first locking ring (23) is threadedly connected to an adjusting screw (16) on its lower side. A locking block (24) is slidably connected inside the circuit breaker housing (11). The locking block (24) is slidably connected to the circuit breaker housing (11). Several second locking rings (25) are fixedly connected to the locking block (24). Each second locking ring (25) abuts against each first locking ring (23). A locking screw (26) is threadedly connected to one side of the locking block (24). The locking screw (26) is rotatably locked to the circuit breaker housing (11).

2. The molded case circuit breaker according to claim 1, characterized in that, The circuit breaker housing (11) is connected to a quick-connect bracket for workers to quickly assemble and disassemble the circuit breaker. The quick-connect bracket includes a support plate (31). Several support rods (32) are fixedly connected to one side of the support plate (31). A linkage plate (33) is rotatably connected to each of the support rods (32). A locking component for limiting the linkage plates (33) on both sides is connected between two linkage plates (33). A locking door plate (34) is fixedly connected to the end of each linkage plate (33) away from the locking component. The side of the support plate (31) away from the support rod (32) is connected to a reset assembly that allows for quick assembly and disassembly of the circuit breaker housing (11) by a locking door plate (34).

3. The molded case circuit breaker according to claim 2, characterized in that, The reset assembly includes two support columns (41), both of which are slidably connected to a support plate (31). A first connecting plate (42) is fixedly connected to one end of each support column (41) away from the support plate (31). A second connecting plate (43) is slidably connected to one end of the first connecting plate (42) away from the support column (41). The second connecting plate (43) is fixedly connected to the outer side of the circuit breaker housing (11). A reset spring (44) is fitted on each support column (41), and both ends of each reset spring (44) abut against the support plate (31) and the first connecting plate (42) respectively. Each of the aforementioned slotting door panels (34) has two slotting grooves (341), and each of the aforementioned slotting grooves (341) has a slotting pin (45) sliding against its narrow inner wall. Each of the aforementioned slotting pins (45) is fixedly connected to the outside of the circuit breaker housing (11). Each locking pin (45) is threaded with a locking nut (46), and the width of the inner wall of each locking groove (341) is greater than the outer diameter of the locking nut (46).

4. The molded case circuit breaker according to claim 2, characterized in that, The positioning assembly includes two support plates (51), each of which is rotatably connected to an adjacent linkage plate (33). A support column (52) is slidably connected between the two support plates (51), and a positioning spring (53) is sleeved on the support column (52). The two ends of the positioning spring (53) abut against the support plates (51) on both sides respectively.

5. The molded case circuit breaker according to claim 2, characterized in that, A guide plate (61) that is inclined downward toward the support rod (32) is fixedly connected to the upper end of the support plate (31), and a drip line (62) is provided on the lower side of the guide plate (61).

6. The molded case circuit breaker according to claim 3, characterized in that, The support plate (31) is fixedly connected to a plurality of first heat sinks (71) on the side facing the first connecting plate (42). The circuit breaker housing (11) has several heat dissipation grooves (15) on the side facing the support plate (31). The width of the groove opening of each heat dissipation groove (15) is greater than the width of the first heat sink (71), and the depth of the groove (15) is greater than the length of the first heat sink (71).

7. The molded case circuit breaker according to claim 5, characterized in that, Several second heat sinks (72) are fixedly connected to the side of the support plate (31) near the guide plate (61).

8. The molded case circuit breaker according to claim 6, characterized in that, The axial length of the support column (41) is greater than the depth of the heat dissipation groove (15).

9. The molded case circuit breaker according to claim 1, characterized in that, When the heating element (122) is 2mm thick and 10mm long, and is used for a resistance of 600-800 microohms, the material of the heating element (122) is preferably brass, and the suitable current is 100A-125A. When used for resistance of 1300-1700 microohms, the heating element (122) is preferably made of silicon bronze and is suitable for currents of 63A and 80A. When used for resistance of 1800-2200 microohms, the heating element (122) is preferably made of constantan and the suitable current is 50A; When used for resistance of 2500-2900 microohms, the heating element (122) is preferably made of nickel-iron and the suitable current is 32A-40A.

10. The molded case circuit breaker according to claim 1, characterized in that, When the heating element (122) is 1.5mm thick and 10mm long, and is used for a resistance of 800-1200 microohms, the material of the heating element (122) is preferably brass, and the suitable current is 80A-100A. When used for resistance of 1300-1700 microohms, the heating element (122) is preferably made of silicon bronze and is suitable for currents of 63A and 80A.

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