circuit breaker

Abstract

The utility model belongs to the low -voltage electric appliance technical field, specifically discloses a circuit breaker. The utility model provides a circuit breaker, one end of thermal element is fixed with base, bimetallic element is fixedly connected with thermal element, magnetic yoke is fixedly connected with thermal element, and / or magnetic yoke is connected with base, the swing arm of armature is rotatably connected with base, when magnetic yoke does not attract armature, the first end of armature is spaced apart from magnetic yoke, when magnetic yoke attracts armature, armature rotates relative to base, the first end of armature is attached to magnetic yoke, the armature and magnetic yoke of this thermal magnetic trip are connected with base respectively, which is different from the structure that the magnetic yoke is fixed through support and the armature is connected with support through pivot in the prior art, the support and pivot are saved, the number of thermal magnetic trip parts is reduced, the structure is simplified, and the circuit breaker production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a circuit breaker. Background Technology

[0002] A trip unit is a common device used to trigger the operating mechanism of a circuit breaker, causing the circuit breaker to automatically disconnect. Trip units can generally be divided into magnetic trip units, electronic trip units, and thermal-magnetic trip units. Among them, thermal-magnetic trip units are widely used due to their advantages such as low cost, stable performance, and long service life. Currently, thermal-magnetic trip units are mainly divided into two types: snap-action type and solenoid type. Both work on the principle that when the circuit current increases, the yoke or coil is magnetized, generating a magnetic attraction force, which in turn attracts the moving iron core to actuate, ultimately striking the operating mechanism to complete the circuit breaker's tripping. The speed of the trip unit's unlocking directly affects the circuit breaker's breaking performance. However, existing thermal-magnetic trip units suffer from complex structures, numerous components, high costs, and difficult assembly, thus reducing the product's competitiveness. Utility Model Content

[0003] The purpose of this utility model is to provide a circuit breaker that reduces the number of components in the thermal-magnetic trip unit, simplifies the structure, facilitates assembly, and reduces the production cost of the circuit breaker.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A circuit breaker includes a base and a thermomagnetic trip unit. The thermomagnetic trip unit is disposed within the base and includes a thermal element, a bimetallic element, an armature, and a magnetic yoke. One end of the thermal element is fixedly connected to the base, the bimetallic element is fixedly connected to the thermal element, the magnetic yoke is fixedly connected to the thermal element, and / or the magnetic yoke is connected to the base. Both opposite ends of the armature are provided with rotating arms, which are rotatably connected to the base. An elastic element is connected between the armature and the magnetic yoke. The elastic element is configured such that when the magnetic yoke does not engage the armature, the first end of the armature is spaced apart from the magnetic yoke.

[0006] As an optional technical solution for the aforementioned circuit breaker, the base is provided with a mounting cavity, the thermomagnetic trip unit is disposed in the mounting cavity, and the opposite side walls of the mounting cavity are respectively provided with first insertion slots, and the opposite ends of the magnetic yoke are inserted into the two first insertion slots.

[0007] As an optional technical solution for the aforementioned circuit breaker, the base is provided with a mounting cavity, the thermomagnetic trip unit is disposed in the mounting cavity, and the two opposite side walls of the mounting cavity are respectively provided with second insertion slots, and the rotating arm is rotatably connected to the second insertion slot on the corresponding side.

[0008] As an optional technical solution for the circuit breaker described above, the armature and the yoke are disposed on both sides of the thermal element. The first end of the armature is provided with a contact plate. The contact plate is disposed at an angle to the armature and extends toward the yoke. When the yoke does not attract the armature, the contact plate is spaced apart from the yoke. When the yoke attracts the armature, the contact plate is in contact with the yoke.

[0009] As an optional technical solution for the circuit breaker described above, the rotating arm is disposed at the second end of the armature, the end of the rotating arm facing the contact plate is connected to the armature, the end of the rotating arm away from the contact plate is provided with a first mounting part, the magnetic yoke is provided with a second mounting part, and the two ends of the elastic member are respectively connected to the first mounting part and the second mounting part.

[0010] As an optional technical solution for the aforementioned circuit breaker, the circuit breaker further includes an arc-extinguishing chamber and an operating mechanism. Both the arc-extinguishing chamber and the operating mechanism are disposed within the base. The arc-extinguishing chamber includes an arc-extinguishing grid assembly, a reflector plate, and a baffle plate. The arc-extinguishing grid assembly is disposed on the side of the reflector plate facing away from the operating mechanism, and an arc-initiating cavity is formed between the arc-extinguishing grid assembly and the reflector plate. The arc-initiating cavity has a first opening on the side facing the operating mechanism. A moving contact assembly connected to the operating mechanism passes through the first opening and is placed inside the arc-initiating cavity. A second opening is provided at the top of the arc-initiating cavity. The baffle plate is connected to the reflector plate. The first end of the baffle plate covers the second opening, and the end of the first end of the baffle plate has a notch. A movable plate is bent and connected to one side of the notch. The movable plate has a state of closing the notch and a state of opening the notch by the airflow in the arc-initiating cavity. The second end of the baffle plate extends to the first opening and is placed on both sides of the moving contact assembly.

[0011] As an optional technical solution for the aforementioned circuit breaker, both ends of the baffle are provided with first connecting members, and the reflector is provided with a corresponding second connecting member, the second connecting member being connected to the first connecting member.

[0012] As an optional technical solution for the circuit breaker described above, the circuit breaker further includes a first connecting plate. The first end of the first connecting plate is provided with a through hole. An arc-guiding plate is connected to the wall of the through hole. The arc-guiding plate is provided with a positioning protrusion. One end of the positioning protrusion is provided with a convex ridge. Static contacts are provided on both sides of the positioning protrusion. The side of the static contact is fitted with the positioning protrusion, and the end face of the static contact is fitted with the convex ridge.

[0013] As an optional technical solution for the aforementioned circuit breaker, the base is provided with a support rib, the second end of the first connecting plate overlaps the support rib and is fixedly connected to the support rib, the second end of the first connecting plate is provided with a heat dissipation hole, the support rib is provided with a heat dissipation groove, and the heat dissipation groove is correspondingly arranged with the heat dissipation hole.

[0014] As an optional technical solution for the circuit breaker described above, the circuit breaker further includes a current transformer assembly and a second connecting plate. The current transformer assembly includes a current transformer. The second connecting plate located in the N phase is connected to a flexible connecting member. The second connecting plates located in other phases are connected to the corresponding thermal elements through metal tubular members or metal plate-shaped members. The flexible connecting member, the metal tubular member, and the metal plate-shaped member all pass through the current transformer.

[0015] The beneficial effects of this utility model are:

[0016] This utility model provides a circuit breaker in which one end of a thermal element is fixed to a base, a magnetic yoke is fixedly connected to the thermal element, and / or the magnetic yoke is connected to the base, and the arm of the armature is rotatably connected to the base. When the magnetic yoke does not engage the armature, the first end of the armature is spaced apart from the magnetic yoke. When the magnetic yoke engages the armature, the armature rotates relative to the base, and the first end of the armature is in contact with the magnetic yoke. The armature and magnetic yoke of this thermomagnetic trip unit are respectively connected to the base. Unlike the existing technology where the magnetic yoke is fixed by a bracket and the armature is connected to the bracket by a rotating shaft, this invention eliminates the bracket and rotating shaft, reduces the number of components in the thermomagnetic trip unit, simplifies the structure, and facilitates assembly, thereby reducing the production cost of the circuit breaker. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the internal structure of the circuit breaker provided in this embodiment of the utility model;

[0018] Figure 2 This is a schematic diagram of the connection between the thermomagnetic trip unit and the base provided in this embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the thermomagnetic trip unit provided in this embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the moving contact assembly and the stationary contact provided in an embodiment of this utility model;

[0021] Figure 5 This is a first-view axonometric view of the arc-extinguishing chamber provided in this embodiment of the present invention;

[0022] Figure 6 This is a second-view axonometric view of the arc-extinguishing chamber provided in this embodiment of the present invention;

[0023] Figure 7This is a schematic diagram of one structure of the reflector provided in an embodiment of the present utility model;

[0024] Figure 8 This is a schematic diagram of another structure of the arc-extinguishing chamber provided in this embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of another structure of the reflector provided in this embodiment of the utility model;

[0026] Figure 10 This is a schematic diagram of the structure of the first connecting plate provided in this embodiment of the utility model;

[0027] Figure 11 This is a schematic diagram of the structure of the base provided in an embodiment of the present utility model;

[0028] Figure 12 This is a schematic diagram of the first structure of the current transformer assembly provided in this embodiment of the present invention;

[0029] Figure 13 This is a schematic diagram of a second structure of the current transformer assembly provided in this embodiment of the present invention;

[0030] Figure 14 This is a schematic diagram of the electromagnetic trip unit installed in the base according to an embodiment of the present invention;

[0031] Figure 15 This is a schematic diagram of the electromagnetic trip device provided in an embodiment of the present invention.

[0032] In the picture:

[0033] 1. Base; 2. Thermomagnetic trip unit; 3. Arc extinguishing chamber; 4. Operating mechanism; 5. First connecting plate; 6. Current transformer assembly; 7. Second connecting plate; 8. Stationary contact; 9. Moving contact assembly; 10. Electromagnetic trip unit;

[0034] 11. Mounting cavity; 12. First insertion slot; 13. Second insertion slot; 14. Support rib; 15. Heat dissipation groove;

[0035] 21. Heating element; 22. Bimetallic element; 23. Armature; 231. Rotary arm; 232. Contact plate; 233. First mounting part; 234. Striking rod; 24. Magnetic yoke; 241. Second mounting part; 25. Elastic element;

[0036] 31. Arc-extinguishing grid assembly; 32. Reflector; 321. Second connector; 322. First positioning plate; 323. Second positioning plate; 324. Third positioning plate; 33. Baffle; 331. Notch; 332. Movable plate; 333. First connector; 334. Clearance opening; 34. First opening; 35. Second opening;

[0037] 51. Through hole; 52. Arc-starting plate; 521. Positioning protrusion; 522. Raised edge; 523. Raised bulge; 54. Heat dissipation hole; 55. Arc-starting angle; 56. Connecting hole;

[0038] 61. Current transformer; 62. Flexible connector; 63. Metal tubular component; 64. Metal plate component;

[0039] 101. Trip unit yoke; 1011. Magnetic yoke body; 1012. Support plate; 1013. Fixing plate; 102. Coil frame; 103. Moving iron core; 104. Coil; 105. Armature hook; 106. Elastic reset component. Detailed Implementation

[0040] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0044] like Figures 1 to 3 As shown, this embodiment provides a circuit breaker, which includes a base 1 and a thermomagnetic trip unit 2. The thermomagnetic trip unit 2 is disposed inside the base 1 and includes a thermal element 21, a bimetallic element 22, an armature 23, and a magnetic yoke 24. One end of the thermal element 21 is fixedly connected to the base 1, the bimetallic element 22 is fixedly connected to the thermal element 21, the magnetic yoke 24 is fixedly connected to the thermal element 21, and / or the magnetic yoke 24 is connected to the base 1. Both ends of the armature 23 are provided with rotating arms 231, which are rotatably connected to the base 1. An elastic element 25 is connected between the armature 23 and the magnetic yoke 24. The elastic element 25 is configured such that when the magnetic yoke 24 does not attract the armature 23, the first end of the armature 23 is spaced apart from the magnetic yoke 24.

[0045] One end of the heating element 21 is fixed to the base 1, the magnetic yoke 24 is fixedly connected to the heating element 21, and / or the magnetic yoke 24 is connected to the base 1. The rotating arm 231 of the armature 23 is rotatably connected to the base 1. When the magnetic yoke 24 does not attract the armature 23, the first end of the armature 23 is spaced apart from the magnetic yoke 24. When the magnetic yoke 24 attracts the armature 23, the armature 23 rotates relative to the base 1, and the first end of the armature 23 is in contact with the magnetic yoke 24. The armature 23 and the magnetic yoke 24 of the thermomagnetic trip unit 2 are respectively connected to the base 1. Unlike the structure in the prior art where the magnetic yoke is fixed by a bracket and the armature is connected to the bracket by a rotating shaft, the bracket and rotating shaft are eliminated, the number of components of the thermomagnetic trip unit 2 is reduced, the structure is simplified, and assembly is convenient, thereby reducing the production cost of the circuit breaker.

[0046] In some embodiments, the magnetic yoke 24 is fixedly connected to the heating element 21. Specifically, the bimetallic element 22 and the magnetic yoke 24 are fixedly connected to the heating element 21 by riveting. The bimetallic element 22 and the magnetic yoke 24 are disposed on both sides of the heating element 21. The same riveting piece can be used to fix the bimetallic element 22 and the magnetic yoke 24 to the heating element 21 at the same time.

[0047] The number of thermal-magnetic trip units 2 varies in circuit breakers of different specifications. For example, in a three-phase four-wire circuit breaker, each phase is provided with one thermal-magnetic trip unit 2.

[0048] The base 1 has a mounting cavity 11, and the thermomagnetic trip unit 2 is placed in the mounting cavity 11. Specifically, each thermomagnetic trip unit 2 has a corresponding mounting cavity 11.

[0049] In other embodiments, the magnetic yoke 24 is connected to the base 1. Optionally, the opposite side walls of the mounting cavity 11 are respectively provided with first insertion slots 12, and the opposite ends of the magnetic yoke 24 are inserted into the two first insertion slots 12, which facilitates fixing the magnetic yoke 24 to the base 1 and has a simple structure.

[0050] The mounting cavity 11 has two opposite side walls respectively provided with second insertion slots 13, and the rotating arm 231 is rotatably connected to the corresponding second insertion slot 13. Furthermore, the rotating arm 231 is inserted into the second insertion slot 13, and the second insertion slot 13 has space for the rotating arm 231 to rotate, which can reduce the number of parts connecting the rotating arm 231 and the second insertion slot 13, and facilitate the installation of the armature 23.

[0051] Alternatively, the magnetic yoke 24 can be connected to the base 1 by bolts.

[0052] In other embodiments, the magnetic yoke 24 is fixedly connected to the heating element 21, and also fixedly connected to the base 1. The specific methods of fixing the magnetic yoke 24 to the heating element 21 and to the base 1 are described above.

[0053] In some embodiments, continue to refer to Figure 3 As shown, the armature 23 and the yoke 24 are disposed on both sides of the heating element 21. Specifically, the armature 23 is disposed on the side of the heating element 21 where the bimetallic element 22 is located. The first end of the armature 23 has a contact plate 232, which is angled with the armature 23 and extends towards the yoke 24. When the yoke 24 is not engaging the armature 23, the contact plate 232 and the yoke 24 are spaced apart. When the yoke 24 engages the armature 23, the contact plate 232 and the yoke 24 are in contact. The cooperation between the yoke 24 and the contact plate 232 restricts the rotation angle of the armature 23. When the yoke 24 is not engaging the armature 23, the elastic element 25 causes the rotating arm 231 to rotate and reset. The contact plate 232 and the yoke 24 are spaced apart, and the second insertion slot 13 restricts the rotation angle of the rotating arm 231.

[0054] The armature 23 is provided with two contact plates 232, which are placed on opposite sides of the magnetic yoke 24, that is, the armature 23 and the two contact plates 232 surround the magnetic yoke 24.

[0055] A rotating arm 231 is disposed at the second end of the armature 23. The end of the rotating arm 231 facing the contact plate 232 is connected to the armature 23, and the end of the rotating arm 231 away from the contact plate 232 is provided with a first mounting part 233. A second mounting part 241 is provided on the magnetic yoke 24. The two ends of the elastic member 25 are respectively connected to the first mounting part 233 and the second mounting part 241. This structure ensures that when the magnetic yoke 24 does not engage the armature 23, the elastic member 25 drives the armature 23 to rotate, so that the first end of the armature 23 is spaced apart from the magnetic yoke 24.

[0056] The first mounting portion 233 includes a first mounting hole, and the second mounting portion 241 includes a second mounting hole. The elastic element 25 is a spring, with one end of the elastic element 25 hooked into the first mounting hole and the other end of the elastic element 25 hooked into the second mounting hole. In some other possible embodiments, the first mounting portion 233 includes a first hook, the second mounting portion 241 includes a second hook, the elastic element 25 is a spring, with one end of the elastic element 25 hooked onto the first hook and the other end of the elastic element 25 hooked onto the second hook.

[0057] like Figure 4 As shown, the circuit breaker also includes an operating mechanism 4 and a stationary contact 8, both of which are housed within the base 1. The operating mechanism 4 is connected to a moving contact assembly 9, which can engage or disengage with the stationary contact 8. The second end of the armature 23 is also provided with a striking rod 234. One end of the striking rod 234 is connected to the armature 23, and the other end of the striking rod 234 is used to strike the traction rod of the operating mechanism 4, causing the moving contact assembly 9 to disengage from the stationary contact 8.

[0058] like Figures 4 to 6As shown, the circuit breaker also includes an arc-extinguishing chamber 3, which is disposed within the base 1. Each phase of the circuit breaker is provided with an arc-extinguishing chamber 3. The arc-extinguishing chamber 3 includes an arc-extinguishing grid assembly 31, a reflector plate 32, and a baffle plate 33. The arc-extinguishing grid assembly 31 is disposed on the side of the reflector plate 32 away from the operating mechanism 4, and an arc-initiating cavity is formed between the arc-extinguishing grid assembly 31 and the reflector plate 32. The arc-initiating cavity has a first opening 34 on the side facing the operating mechanism 4. The moving contact assembly 9 connected to the operating mechanism 4 passes through the first opening 34 and is placed in the arc-initiating cavity. The top of the arc-initiating cavity has a second opening 35. The baffle plate 33 is connected to the reflector plate 32. The first end of the baffle plate 33 covers the second opening 35, and the end of the first end of the baffle plate 33 has a notch 331. One side of the notch 331 is bent and connected to a movable plate 332. The movable plate 332 has a state of closing the notch 331 and a state of opening the notch 331 by the airflow in the arc-initiating cavity. When a short circuit occurs in the circuit breaker, a large airflow is generated in the arc-ignition cavity. This airflow blows towards the movable plate 332, which opens the notch 331. The airflow can then be quickly discharged through the notch 331, reducing the temperature inside the arc-ignition cavity and preventing the high-temperature airflow from burning the moving contact assembly 9 and the stationary contact 8. After the airflow in the arc-ignition cavity decreases, the movable plate 332 automatically resets and closes the notch 331. The second end of the baffle 33 extends to the first opening 34 and is positioned on both sides of the moving contact assembly 9. The baffle 33 reduces the diameter of the first opening 34, thereby reducing the airflow to the operating mechanism 4 and protecting the operating mechanism 4.

[0059] The second end of the baffle 33 has a clearance opening 334, which is used for the moving contact assembly 9 to pass through. The baffle 33 blocks the gap between the moving contact assembly 9 and the side wall of the first opening 34, and does not affect the operation of the moving contact assembly 9.

[0060] The movable plate 332 and the baffle 33 are integrally formed. The movable plate 332 can be cut out from the baffle 33. While forming the movable plate 332, a notch 331 is also formed in the baffle 33. One side of the movable plate 332 is connected to the baffle 33 and has a crease. The movable plate 332 can be flipped relative to the baffle 33. The baffle 33 and the movable plate 332 are made of red steel cardboard or cardboard, etc. The baffle 33 and the movable plate 332 can also be made of other materials. No specific limitation is made here.

[0061] Optionally, the baffle 33 is fixedly connected to the reflector 32. Both ends of the baffle 33 are provided with first connectors 333, and the reflector 32 is provided with corresponding second connectors 321. The second connectors 321 are connected to the first connectors 333, thus realizing the connection between the baffle 33 and the reflector 32.

[0062] like Figure 5 and Figure 6As shown, the first end of the baffle 33 is provided with two first connectors 333 at intervals, the second end of the baffle 33 has a clearance opening 334, the baffle 33 on both sides of the clearance opening 334 is provided with first connectors 333 respectively, the reflector 32 has a stepped surface on one side with the first opening 34, the second end of the baffle 33 extends to the stepped surface, and the second connector 321 is provided above the stepped surface.

[0063] The first connector 333 is a socket, and the second connector 321 is a plug. The plug is inserted into the socket, thus fixing the baffle 33 onto the reflector 32. Alternatively, the first connector 333 is a plug, and the second connector 321 is a socket, with the plug inserted into the socket.

[0064] In some embodiments, such as Figure 7 As shown, the reflector 32 has two protruding first positioning plates 322 on opposite sides of the first opening 34. Each first positioning plate 322 has a stepped surface, and a second connecting member 321 is disposed on the first positioning plate 322 above the stepped surface. The second opening 35 has two protruding second positioning plates 323 on opposite sides. The second positioning plates 323 are connected to the corresponding first positioning plates 322, and the second positioning plates 323 are provided with second connecting members 321. In other embodiments, such as... Figure 8 and Figure 9 As shown, a first positioning plate 322 protrudes from the reflector 32 on both sides opposite to the first opening 34, and the first positioning plate 322 has a stepped surface. A third positioning plate 324 is provided on the side of each first positioning plate 322 away from the first opening 34. The third positioning plate 324 also has a stepped surface, and a second connecting member 321 is provided on the third positioning plate 324 above the stepped surface. Baffles 33 on both sides of the clearance opening 334 abut against the two stepped surfaces, and the first connecting member 333 is connected to the second connecting member 321. A second positioning plate 323 protrudes from both sides opposite to the second opening 35, and the second positioning plate 323 is connected to the corresponding first positioning plate 322. The second positioning plate 323 is provided with the second connecting member 321.

[0065] In some embodiments, such as Figure 6 As shown, the two opposite sides of the first end of the baffle 33 are stepped, and the stepped surface on the baffle 33 is inclined, which makes the width of the first end of the baffle 33 greater than the width of other positions, thereby increasing the contact area between the baffle 33 and the reflector 32.

[0066] In other embodiments, such as Figure 8 As shown, the two opposite sides of the first end of the baffle 33 are stepped, and the steps are right angles. The width of the end of the first end of the baffle 33 is greater than the width of other positions.

[0067] The structures of the reflector 32 and the arc-extinguishing grid assembly 31 are both existing technologies and are not specifically limited here.

[0068] Continue to refer to Figure 4 As shown, the circuit breaker has an inlet connection port and an outlet connection port. A first connecting plate 5 is provided at the outlet connection port, and a second connecting plate 7 is provided at the inlet connection port. Both the first connecting plate 5 and the second connecting plate 7 are used to connect to the conductors of the external line so as to connect the circuit breaker to the line.

[0069] Combination Figure 4 and Figure 10 As shown, the first connecting plate 5 is provided with a stationary contact 8, which is used to engage or disengage with the moving contact assembly 9 of the circuit breaker. Specifically, the first end of the first connecting plate 5 is provided with a through hole 51, and the wall of the through hole 51 is connected to an arc-starting plate 52. The arc-starting plate 52 is provided with a positioning protrusion 521, and one end of the positioning protrusion 521 is provided with a protruding ridge 522. Stationary contacts 8 are respectively provided on both sides of the positioning protrusion 521. The stationary contacts 8 are arranged one-to-one with the moving contacts on the moving contact assembly 9. The side of the stationary contact 8 is fitted with the positioning protrusion 521, and the end face of the stationary contact 8 is fitted with the protruding ridge 522. The stationary contacts 8 are positioned and welded to the arc-starting plate 52 by the positioning protrusion 521 and the protruding ridge 522, which improves the positional accuracy of the stationary contacts 8 on the arc-starting plate 52. Since there is a gap between the blades of the moving contact assembly 9, and each blade is provided with a moving contact, the number of stationary contacts 8 is the same as the number of moving contacts. Therefore, a positioning protrusion 521 is provided between two stationary contacts 8. This not only positions the stationary contact 8 but also ensures that the moving contact and the stationary contact 8 are effectively engaged, and effectively reduces the weight of the stationary contact 8.

[0070] The arc-starting plate 52 is connected to the arc-starting angle 55. Specifically, the arc-starting plate 52 is provided with a protrusion 523, and the arc-starting angle 55 is provided with a riveting hole. The protrusion 523 is inserted into the riveting hole and riveted, thereby realizing the fixed connection between the arc-starting angle 55 and the arc-starting plate 52.

[0071] like Figure 10 and Figure 11 As shown, the base 1 is provided with a support rib 14. The second end of the first connecting plate 5 overlaps with and is fixedly connected to the support rib 14. The second end of the first connecting plate 5 is provided with a heat dissipation hole 54. The support rib 14 is provided with a heat dissipation groove 15, which is correspondingly arranged with the heat dissipation hole 54. The high-temperature gas inside the circuit breaker can be quickly discharged to the outside through the heat dissipation hole 54 and the heat dissipation groove 15, improving the heat dissipation efficiency of the circuit breaker. The heat dissipation groove 15 is recessed at the end of the support rib 14, and the two side walls of the heat dissipation groove 15 penetrate the support rib 14. The groove opening of the heat dissipation groove 15 is correspondingly arranged with the heat dissipation hole 54. The high-temperature gas enters the heat dissipation groove 15 through the heat dissipation hole 54, flows into the base 1 through the two sides of the heat dissipation groove 15, and is discharged to the outside.

[0072] The second end of the first connecting plate 5 is also provided with a connecting hole 56. Self-tapping screws pass through the connecting hole 56 and connect with the support rib 14, which is convenient for assembly and has low cost.

[0073] like Figure 12 and Figure 13 As shown, the circuit breaker also includes a current transformer assembly 6, which includes a current transformer 61. A second connecting plate 7 located in the N phase is connected to a flexible connecting member 62. The second connecting plates 7 located in other phases are connected to the corresponding thermal elements 21 through metal tubular members 63 or metal plate-shaped members 64. The current transformer 61 is installed through the flexible connecting member 62, the metal tubular member 63, and the metal plate-shaped member 64. The metal tubular member 63 or the metal plate-shaped member 64 can be selected according to the internal structure of the circuit breaker.

[0074] For example, the circuit breaker is a three-phase four-wire circuit breaker, such as Figure 12 As shown, phases A and C of the circuit breaker are connected to the thermal element 21 and the second connecting plate 7 using metal tubular components 63, while phase B is connected to the thermal element 21 and the second connecting plate 7 using metal plate components 64. Figure 13 As shown, or the A, B and C phases of the circuit breaker are all connected to the thermal element 21 and the second connecting plate 7 by metal plate-shaped parts 64.

[0075] The aforementioned metal tubular component 63 may be a copper tubular component. One end of the metal tubular component 63 is welded to the second connecting plate 7, and the other end is connected to the heating element 21 by screws. An insulating sleeve is fitted over the outside of the metal tubular component 63.

[0076] The aforementioned metal plate 64 may be made of copper. The metal plate 64 and the second connecting plate 7 are integrally formed. The metal plate 64 and the heating element 21 are connected by screws. An insulating sleeve is fitted on the outer side of the metal plate 64.

[0077] like Figure 14 and Figure 15As shown, the circuit breaker also includes an electromagnetic trip unit 10, which includes a trip unit yoke 101, a coil frame 102, and a moving iron core 103. The trip unit yoke 101 is provided with the coil frame 102, and a coil 104 is wound on the coil frame 102. One end of the moving iron core 103 is placed inside the coil frame 102, and the other end of the moving iron core 103 is placed outside the coil frame 102 and connected to an armature hook 105. An elastic reset member 106 is provided between the armature hook 105 and the coil frame 102, and the elastic reset member 106 is sleeved on the outside of the moving iron core 103. When the coil 104 is energized, a magnetic field is generated. The magnetic field causes the trip unit yoke 101 to attract the moving iron core 103. The elastic reset member 106 is compressed and stores energy. The moving iron core 103 moves toward the trip unit yoke 101, which drives the armature hook 105 to move. The armature hook 105 triggers the traction rod of the operating mechanism 4, which causes the operating mechanism 4 to drive the moving contact assembly 9 to disconnect from the stationary contact 8, and the circuit breaker is tripped.

[0078] The electromagnetic trip unit 10 is fixed inside the base 1. Specifically, the electromagnetic trip unit 10 is fixed inside the base 1 via a trip unit yoke 101. The trip unit yoke 101 includes a U-shaped yoke body 1011, a coil frame 102 disposed inside the yoke body 1011, and both ends of the coil frame 102 fixedly connected to the two side walls of the yoke body 1011. One side wall of the yoke body 1011 has a hole for the moving iron core 103 to pass through, and a support plate 1012 extends outward from this side wall, with an armature hook 105 connected to the support plate 1012. A fixing plate 1013 is provided on one bottom edge of the yoke body 1011. The fixing plate 1013 is L-shaped, with one end integrally connected to the yoke body 1011, and the other end fitted to the base 1 and connected to the base 1 by screws. The fixing plate 1013 supports and fixes the electromagnetic trip unit 11 inside the base 1.

[0079] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A circuit breaker, characterized in that, The device includes a base (1) and a thermomagnetic trip unit (2). The thermomagnetic trip unit (2) is disposed within the base (1). The thermomagnetic trip unit (2) includes a thermal element (21), a bimetallic element (22), an armature (23), and a magnetic yoke (24). One end of the thermal element (21) is fixedly connected to the base (1). The bimetallic element (22) is fixedly connected to the thermal element (21). The magnetic yoke (24) is fixedly connected to the thermal element (21). / Or the magnetic yoke (24) is connected to the base (1), and the armature (23) is provided with rotating arms (231) at both ends opposite to each other. The rotating arms (231) are rotatably connected to the base (1). An elastic element (25) is connected between the armature (23) and the magnetic yoke (24). The elastic element (25) is configured to make the first end of the armature (23) spaced apart from the magnetic yoke (24) when the magnetic yoke (24) does not attract the armature (23).

2. The circuit breaker according to claim 1, characterized in that, The base (1) is provided with an installation cavity (11), the thermomagnetic trip unit (2) is disposed in the installation cavity (11), the opposite side walls of the installation cavity (11) are respectively provided with first insertion slots (12), and the opposite ends of the magnetic yoke (24) are inserted into the two first insertion slots (12).

3. The circuit breaker according to claim 1, characterized in that, The base (1) is provided with an installation cavity (11), the thermomagnetic trip unit (2) is provided in the installation cavity (11), and the two opposite side walls of the installation cavity (11) are respectively provided with second insertion slots (13), and the rotating arm (231) is rotatably connected to the second insertion slot (13) on the corresponding side.

4. The circuit breaker according to claim 1, characterized in that, The armature (23) and the yoke (24) are disposed on both sides of the heating element (21). The first end of the armature (23) is provided with a contact plate (232). The contact plate (232) is disposed at an angle to the armature (23) and extends toward the yoke (24). When the yoke (24) does not attract the armature (23), the contact plate (232) and the yoke (24) are spaced apart. When the yoke (24) attracts the armature (23), the contact plate (232) and the yoke (24) are in contact.

5. The circuit breaker according to claim 4, characterized in that, The rotating arm (231) is disposed at the second end of the armature (23). The end of the rotating arm (231) facing the contact plate (232) is connected to the armature (23). The end of the rotating arm (231) away from the contact plate (232) is provided with a first mounting part (233). The magnetic yoke (24) is provided with a second mounting part (241). The two ends of the elastic member (25) are respectively connected to the first mounting part (233) and the second mounting part (241).

6. The circuit breaker according to claim 1, characterized in that, The circuit breaker further includes an arc-extinguishing chamber (3) and an operating mechanism (4). Both the arc-extinguishing chamber (3) and the operating mechanism (4) are disposed within the base (1). The arc-extinguishing chamber (3) includes an arc-extinguishing grid assembly (31), a reflector plate (32), and a baffle plate (33). The arc-extinguishing grid assembly (31) is disposed on the side of the reflector plate (32) facing away from the operating mechanism (4), and an arc-initiating cavity is formed between the arc-extinguishing grid assembly (31) and the reflector plate (32). The arc-initiating cavity has a first opening (34) on the side facing the operating mechanism (4), and the moving contact assembly (9) connected to the operating mechanism (4) passes through the first opening (34). The baffle (33) is placed inside the arc-initiating cavity, and the top of the arc-initiating cavity is provided with a second opening (35). The baffle (33) is connected to the reflector (32). The first end of the baffle (33) covers the second opening (35), and the end of the first end of the baffle (33) is provided with a notch (331). One side of the notch (331) is bent and connected to a movable plate (332). The movable plate (332) has a state of closing the notch (331) and a state of opening the notch (331) by the airflow in the arc-initiating cavity. The second end of the baffle (33) extends to the first opening (34) and is placed on both sides of the moving contact assembly (9).

7. The circuit breaker according to claim 6, characterized in that, Both ends of the baffle (33) are provided with a first connector (333), and the reflector (32) is provided with a second connector (321), which is connected to the first connector (333).

8. The circuit breaker according to claim 1, characterized in that, The circuit breaker also includes a first connecting plate (5), the first connecting plate (5) has a through hole (51) at its first end, the through hole (51) is connected to an arc-guiding plate (52) on its wall, the arc-guiding plate (52) has a positioning protrusion (521) on its side, one end of the positioning protrusion (521) has a protruding ridge (522), and stationary contacts (8) are respectively provided on both sides of the positioning protrusion (521). The side of the stationary contact (8) is fitted with the positioning protrusion (521), and the end face of the stationary contact (8) is fitted with the protruding ridge (522).

9. The circuit breaker according to claim 8, characterized in that, The base (1) is provided with a support rib (14), the second end of the first connecting plate (5) overlaps the support rib (14) and is fixedly connected to the support rib (14), the second end of the first connecting plate (5) is provided with a heat dissipation hole (54), the support rib (14) is provided with a heat dissipation groove (15), and the heat dissipation groove (15) is provided with a corresponding heat dissipation hole (54).

10. The circuit breaker according to claim 1, characterized in that, The circuit breaker also includes a current transformer assembly (6) and a second connecting plate (7). The current transformer assembly (6) includes a current transformer (61). The second connecting plate (7) located in the N phase is connected to a flexible connector (62). The second connecting plates (7) located in other phases are connected to the corresponding thermal element (21) through a metal tubular member (63) or a metal plate member (64). The flexible connector (62), the metal tubular member (63), and the metal plate member (64) all pass through the current transformer (61).

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