Tripping structure and circuit breaker

Abstract

The tripping structure comprises a first module and a second module, the first module comprises a support, a traction rod, a transmission part, an armature, a traction rod spring providing elastic reset force for the traction rod and an armature spring providing elastic reset force for the armature, and the armature is in driving connection with the traction rod through the transmission part. The second module comprises a temperature sensing element and a magnet yoke located below the support, the armature extends downwards to form an attraction part opposite to the magnet yoke in a spaced mode, a through cavity for the temperature sensing element to penetrate through is defined between the attraction part and the magnet yoke, and the part, penetrating into the through cavity, of the temperature sensing element is fixedly connected with the magnet yoke. The circuit breaker comprises the tripping structure. According to the tripping structure and the circuit breaker, the traction rod, the transmission part and the armature share the support and are integrated in the first module, the temperature sensing element and the magnet yoke are integrated in the second module, module assembling is facilitated, the support replaces the upper half portion of the magnet yoke to be used for installing the armature, and the electromagnetic torque borne by the armature is increased.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a tripping structure and a circuit breaker. Background Technology

[0002] With the continuous development of photovoltaic technology, the performance requirements of its power distribution system for molded case circuit breakers are gradually increasing, prompting molded case circuit breaker products to continuously develop towards smaller size and higher performance. In existing circuit breaker trip units, the armature and yoke are assembled into a separate module, which is fixed to the yoke bracket by shafts, snap rings, and other parts for assembly and limiting. This process involves many steps and is inconvenient to assemble. Moreover, the upper part of the yoke is assembled close to the two sides of the armature, resulting in a small air gap. Furthermore, the magnetic path formed around the energized circuit diverts a large amount of magnetic flux, resulting in a small electromagnetic torque between the yoke and the armature, which is insufficient to drive the armature to move. Summary of the Invention

[0003] The purpose of this invention is to overcome at least one defect of the prior art and to provide a tripping structure and a circuit breaker.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The tripping structure includes a first module and a second module. The first module includes a bracket, a traction rod, a transmission component, and an armature, all rotatably mounted on the bracket. It also includes a traction rod spring providing elastic restoring force to the traction rod and an armature spring providing elastic restoring force to the armature. The armature is driven to the traction rod via the transmission component, and the traction rod can drive the operating mechanism to trip. The second module includes a temperature-sensing element and a magnetic yoke located below the bracket. The armature extends downward to form an attractive portion spaced opposite to the magnetic yoke. The attractive portion and the magnetic yoke form a cavity for the temperature-sensing element to pass through. The portion of the temperature-sensing element that passes through the cavity is fixedly connected to the magnetic yoke.

[0006] Optionally, the bracket is provided with a first mounting cavity for mounting the traction rod and a second mounting cavity located below the first mounting cavity. The first mounting cavity and the second mounting cavity are connected by a communication port. The transmission component is installed in the second mounting cavity and is provided with a first transmission arm that passes through the communication port and cooperates with the traction rod. The armature is installed in the second mounting cavity, and the armature's suction part extends out of the second mounting cavity.

[0007] Optionally, the bracket includes a base plate and two side plates vertically disposed on both sides of the base plate. The base plate and the two side plates form a first mounting cavity. The base plate extends downward to form at least two lower mounting arms. The two lower mounting arms are disposed at intervals and opposite to each other, and the two lower mounting arms form a second mounting cavity between them.

[0008] Optionally, the traction rod includes a traction rod rotating part, which is rotatably mounted on the bracket via a traction rod pivot. The traction rod rotating part extends downward to form a first driven arm that cooperates with the transmission component, and the traction rod rotating part extends rearward to form a release arm for disengaging the operating mechanism.

[0009] Optionally, the first module further includes a release element rotatably mounted on the bracket, wherein a release element spring is provided between the release element and the bracket to provide elastic restoring force for the release element, the traction rod drives the operating mechanism to release via the release element, and the release element is limited to the traction rod.

[0010] Optionally, the bracket includes a rear plate that serves as the rear sidewall of the first mounting cavity. The rear plate extends rearward to form two spaced-apart rear mounting arms. The release element is rotatably mounted between the two rear mounting arms via a release element pivot. One end of the release element extends into the first mounting cavity through a perforation on the rear plate and is provided with a limiting surface that cooperates with the traction rod.

[0011] Optionally, the transmission component includes a transmission component rotating part, which is rotatably mounted on the bracket via a transmission component shaft. The transmission component rotating part extends to both sides to form a first transmission arm that cooperates with the traction rod and a second transmission arm that cooperates with the armature. The second transmission arm is provided with a transmission groove, and the armature is provided with a drive arm whose end is inserted into the transmission groove.

[0012] Optionally, the armature includes an armature rotating part, which has a U-shaped structure. Both sides of the armature rotating part are rotatably mounted on the bracket via an armature shaft. The bottom edge of the armature rotating part extends downward to form the suction part, and the top edge of the bottom edge of the armature rotating part extends towards the opening to form a drive arm that cooperates with the transmission component.

[0013] Optionally, the second module further includes a bimetallic strip, one end of which is inserted into the cavity and stacked and riveted together with the temperature sensing element and the magnetic yoke in sequence, and the other end of which is driven by the traction rod.

[0014] Optionally, the magnetic yoke has a U-shaped structure, with the opening of the magnetic yoke facing the armature's attraction portion, and the edges of both sides of the magnetic yoke having attraction slopes spaced apart from the attraction portion. The bottom edge of the magnetic yoke is riveted to the temperature sensing element.

[0015] Circuit breaker, including the tripping structure described in any one of the claims.

[0016] Optionally, it also includes a base, an operating mechanism mounted on the base, and at least one conductive unit. Each conductive unit includes a unit housing mounted on the base and a contact mechanism installed inside the unit housing. The contact mechanism includes a cooperating moving contact and a stationary contact. The operating mechanism is driven to connect with the moving contact and can drive the moving contact to close or open with the stationary contact. The temperature sensing element of the tripping structure is a terminal block for direct connection to an external conductor. The temperature sensing element is electrically connected to the contact mechanism. When a short circuit fault occurs in the circuit breaker, the armature of the tripping structure cooperates with the traction rod to drive the operating mechanism to trip.

[0017] Optionally, the unit housing has an L-shaped structure. The unit housing is located on the rear side of the tripping structure, and the opening of the unit housing faces the tripping structure. A support platform is provided on the inner side of the end of the unit housing closest to the tripping structure. The operating mechanism is located in the opening of the unit housing. The bracket of the tripping structure is mounted on the base. The bracket extends backward to form a rear support plate, and the rear support plate is placed on the support platform of the unit housing.

[0018] The tripping structure and circuit breaker of this utility model integrate the traction rod, transmission components, and armature into a shared bracket in the first module, while the temperature sensing element and magnetic yoke are integrated into the second module. This facilitates module assembly, saves assembly time, and allows the bracket to replace the upper part of the magnetic yoke for armature mounting. The armature and magnetic yoke are assembled independently, which not only saves magnetic yoke metal material but also removes the upper part of the magnetic yoke, effectively cutting off the magnetic path and forcing the magnetic flux through the working air gap. This reduces the risk of phase-to-phase short circuits and creepage distance, increases the electromagnetic torque on the armature, enhances the electromagnetic force, and ensures reliable mechanism operation under low rated current, thus better realizing the design of a low-current tripping device. At the same time, the magnetic yoke and temperature sensing element of the second module are easy to rivet together without the need for retaining rings, reducing assembly difficulty.

[0019] In addition, the traction rod, transmission components, and armature are respectively installed in two independent mounting cavities of the bracket, which facilitates the orderly assembly of the traction rod, transmission components, and armature, and ensures orderly coordination of their movements, thus avoiding interference.

[0020] In addition, by engaging the end of the armature's drive arm into the transmission groove of the transmission component, the drive arm of the armature and the second transmission arm of the transmission component are linked, making the fit between the armature and the transmission component reliable and stable, and facilitating assembly. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the circuit breaker of this utility model;

[0022] Figure 2 This is a perspective view of the tripping structure of this utility model;

[0023] Figure 3 This is a partial sectional view of the tripping structure of this utility model;

[0024] Figure 4 This is a side view of the tripping structure of this utility model;

[0025] Figure 5 This is a front perspective view of the bracket of this utility model;

[0026] Figure 6 This is a rear-view perspective view of the bracket of this utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the traction rod of this utility model;

[0028] Figure 8 This is a structural schematic diagram of the transmission component of this utility model;

[0029] Figure 9 This is a schematic diagram of the armature structure of this utility model;

[0030] Figure 10 This is a structural schematic diagram of the second module of this utility model.

[0031] First module 1; bracket 11; first mounting cavity 111; second mounting cavity 112; base plate 113; connecting port 113a; side plate 114; lower mounting arm 115; rear plate 116; through hole 116a; rear mounting arm 117; rear support plate 118; traction rod 12; traction rod shaft 120; traction rod rotating part 121; first driven arm 122; release arm 123; second driven arm 124; traction rod spring 13; transmission component 14; transmission component shaft 140 ; Transmission rotating part 141; First transmission arm 142; Second transmission arm 143; Transmission groove 144; Armature 15; Armature rotating shaft 150; Armature rotating part 151; Attraction part 152; Drive arm 153; Armature spring 16; Release element 17; Release element rotating shaft 170; Limiting surface 171; Release element spring 18; Second module 2; Magnetic yoke 21; Attraction inclined surface 211; Temperature sensing element 22; Bimetallic strip 23; Base 3; Operating mechanism 4; Conductive unit 5. Detailed Implementation

[0032] The following embodiments, in conjunction with the accompanying drawings, further illustrate the specific implementation of the tripping structure and circuit breaker of this utility model. The tripping structure and circuit breaker of this utility model are not limited to the descriptions in the following embodiments.

[0033] like Figure 1As shown, the circuit breaker in this embodiment includes a base 3, an operating mechanism 4 mounted on the base 3, a traction rod 12, and at least one conductive unit 5. Each conductive unit 5 includes a pair of terminal blocks, a unit housing mounted on the base 3, and a contact mechanism installed inside the unit housing and connected between the pair of terminal blocks. The pair of terminal blocks serve as the inlet and outlet terminals, respectively. The contact mechanism includes a cooperating moving contact and a stationary contact. The operating mechanism 4 is driven by the moving contact and can drive the moving contact to swing and close or open with the stationary contact, thereby connecting or disconnecting the conductive unit 5. Multiple conductive units 5 are arranged in a row, and the moving contacts of the conductive units 5 are linked together to achieve synchronous operation of multiple conductive units.

[0034] The operating mechanism 4 in this embodiment is existing technology and typically includes a mounting bracket, a handle, an energy storage spring, a crank, a connecting rod, a rocker arm, a jump catch, a locking catch, and a re-catching catch, all rotatably mounted on the mounting bracket. The jump catch and the locking catch engage in a latching engagement, and the locking catch and the re-catching catch are in a limiting engagement. The crank is rotatably mounted on the jump catch. One end of the connecting rod is rotatably connected to the crank via a spring shaft, and the other end is directly or indirectly connected to the moving contact of the contact mechanism to drive the moving contact of the contact mechanism to rotate. One end of the energy storage spring is connected to the rocker arm, and the other end is connected to the spring shaft at the connection between the connecting rod and the crank. The rocker arm, crank, locking catch, jump catch, connecting rod, and energy storage spring constitute the linkage structure of the operating mechanism 4. The latching engagement of the locking catch and the jump catch restricts the rotation position of the crank, allowing the crank to rotate around the jump catch as the rotation center. When the circuit breaker is in normal operation, the handle drives the rocker arm to swing, which in turn drives the crank and connecting rod to rotate. This, in turn, drives the moving contact of the contact mechanism to rotate and close or open with the stationary contact, thus realizing the closing and opening of the circuit breaker. The traction rod 12 is located on one side of the operating mechanism 4 and is used to drive the re-clamp and the latch to release the limit engagement, so that the latch and the trip latch can be released from the engagement, and the operating mechanism 4 can be disengaged to realize the circuit breaker tripping and power disconnection.

[0035] The circuit breaker in this embodiment also includes a protection mechanism corresponding to the conductive unit 5 and used to drive the traction rod 12. The protection mechanism includes a short-circuit protection mechanism and / or an overload protection mechanism. When a short-circuit or overload fault occurs in the circuit breaker, each short-circuit protection mechanism or overload protection mechanism drives the traction rod 12 to trip the operating mechanism 4, thereby causing the circuit breaker to trip.

[0036] The improvement of this application is that, Figure 2-4As shown, the tripping structure of this embodiment, in terms of structure, includes a first module 1 and a second module 2. The first module 1 includes a bracket 11, a traction rod 12, a transmission component 14, and an armature 15 respectively rotatably mounted on the bracket 11, as well as a traction rod spring 13 that provides elastic restoring force to the traction rod 12 and an armature spring 16 that provides elastic restoring force to the armature 15. The armature 15 is driven to the traction rod 12 through the transmission component 14. The traction rod 12 can drive the operating mechanism 4 to trip. The second module 2 includes a temperature sensing element 22 (also called a thermal element), a bimetallic strip 23, and a magnetic yoke 21 located below the bracket 11. The armature 15 extends downward to form an attractive portion 152 that is spaced apart from the magnetic yoke 21. The attractive portion 152 and the magnetic yoke 21 form a cavity for the temperature sensing element 22 to pass through. The portions of the temperature sensing element 22 and the bimetallic strip 23 that pass through the cavity are fixedly connected to the magnetic yoke 21. The fixed connection between the part of the temperature sensing element 22 and the bimetallic strip 23 that passes through the cavity and the magnetic yoke 21 can be fixed by riveting, welding or other fixed connection methods.

[0037] In this embodiment, the tripping structure, functionally speaking, includes a temperature-sensing element 22, which is a terminal block for direct connection to an external conductor within a conductive unit. One end of the temperature-sensing element 22 extends into the unit housing and is electrically connected to the moving contact of the contact mechanism, while the other end is fixed to the base 3. The armature 15, armature spring 16, and magnetic yoke 21 of the tripping structure constitute a short-circuit protection mechanism. The bimetallic strip 23 of the tripping structure serves as an overload protection mechanism. The short-circuit protection mechanism and the overload protection mechanism together constitute a thermomagnetic trip unit. When a short-circuit fault occurs in the circuit breaker, the armature 15 of the tripping structure cooperates with the traction rod 12 to drive the operating mechanism 4 to trip. When an overload fault occurs in the circuit breaker, the bimetallic strip 23 of the tripping structure cooperates with the traction rod 12 to drive the operating mechanism 4 to trip. Obviously, the tripping structure of this embodiment can omit the bimetallic strip 23, i.e., it does not have an overload protection function.

[0038] In this embodiment, the tripping structure and circuit breaker share a bracket 11 for the traction rod 12, transmission component 14, and armature 15, which is integrated in the first module 1. The temperature sensing element 22 and magnetic yoke 21 are integrated in the second module 2, which facilitates module assembly and saves assembly time. The bracket 11 replaces the upper part of the magnetic yoke 21 for mounting the armature 15. The armature 15 and magnetic yoke 21 are assembled independently, which not only saves the metal material of the magnetic yoke 21, but also removes the upper part of the magnetic yoke 21, which is equivalent to cutting off the magnetic path. This forces the magnetic flux to flow through the working air gap, reduces the risk of phase-to-phase short circuits and creepage distance, increases the electromagnetic torque on the armature 15, enhances the electromagnetic force, and ensures reliable operation of the mechanism under small rated current, thereby better realizing the design of the small current tripping device. At the same time, the magnetic yoke 21 and temperature sensing element 22 of the second module 2 are easy to rivet together without the need for snap rings, reducing the difficulty of assembly.

[0039] like Figure 2 , Figure 5 and Figure 6 As shown, the bracket 11 has a first mounting cavity 111 for mounting the traction rod 12 and a second mounting cavity 112 located below the first mounting cavity 111. The first mounting cavity 111 and the second mounting cavity 112 are connected by a connecting port 113a. The transmission component 14 is installed in the second mounting cavity 112 and has a first transmission arm 142 that passes through the connecting port 113a and cooperates with the traction rod 12. The armature 15 is installed in the second mounting cavity 112, and the suction part 152 of the armature 15 extends out of the second mounting cavity 112. The traction rod 12, transmission component 14, and armature 15 are respectively installed in the two independent mounting cavities of the bracket 11, which facilitates the orderly assembly of the traction rod 12, transmission component 14, and armature 15, and ensures orderly cooperation of their actions, avoiding interference.

[0040] Specifically, the bracket 11 is a one-piece molded structure, including a base plate 113 and two side plates 114 vertically disposed on both sides of the base plate 113. The base plate 113 and the two side plates 114 form a first mounting cavity 111. The base plate 113 extends downward to form at least two lower mounting arms 115, which are spaced apart and opposite to each other, forming a second mounting cavity 112 between the two lower mounting arms 115. The bracket 11 has a simple structure and is easy to manufacture.

[0041] like Figure 1 As shown, the housing of the conductive unit 5 has an L-shaped structure. The housing is located behind the tripping structure, with its opening facing the tripping structure. A support platform is provided on the inner side of the end of the housing closest to the tripping structure. The operating mechanism 4 is located inside the opening of the housing. The bracket 11 of the tripping structure is mounted on the base 3. Figure 6 As shown, the bracket 11 extends rearward to form a rear support plate 118, which is placed on the support platform of the unit housing. The conductive unit 5, the operating mechanism 4, and the tripping structure are assembled in an orderly manner on the base 3, with a compact layout that saves space.

[0042] like Figure 2 and Figure 7 As shown, the traction rod 12 is an integrally formed structure, including a traction rod rotating part 121. The traction rod rotating part 121 is rotatably mounted on the bracket 11 via a traction rod pivot 120. The traction rod rotating part 121 extends downward to form a first driven arm 122 that cooperates with the transmission component 14. The traction rod rotating part 121 extends rearward to form a release arm 123 for disengaging the operating mechanism 4. The release arm 123 is inclined upward. The traction rod rotating part 121 extends upward to form a second driven arm 124 that cooperates with the bimetallic strip 23. The traction rod spring 13 is a torsion spring, with one end connected to the traction rod 12 and the other end connected to the bracket 11.

[0043] like Figures 2-4 As shown, the first module 1 also includes a release member 17 rotatably mounted on the bracket 11. A release member spring 18 is provided between the release member 17 and the bracket 11 to provide elastic restoring force for the release member 17. The traction rod 12 drives the operating mechanism 4 to release via the release member 17. The release member 17 is limited in engagement with the release arm 123 of the traction rod 12 and engages with the re-locking drive of the operating mechanism 4. Of course, the release member 17 may not be provided, and the release arm 123 of the traction rod 12 extends to directly engage with the re-locking drive of the operating mechanism 4.

[0044] like Figure 2 , Figure 6 and Figure 8 As shown, the bracket 11 also includes a rear plate 116 serving as the rear sidewall of the first mounting cavity 111. The rear plate 116 is vertically disposed on the rear side of the base plate 113 and vertically connected between the two side plates 114. The rear plate 116 extends rearward to form two spaced-apart rear mounting arms 117. The release member 17 is rotatably mounted between the two rear mounting arms 117 via a release member pivot 170. One end of the release member 17 extends into the first mounting cavity 111 through a through hole 116a on the rear plate 116 and is provided with a limiting surface 171 that cooperates with the traction rod 12. The release member spring 18 is a torsion spring, sleeved on the release member pivot 170 and located between the release member 17 and one of the rear mounting arms 117. One end of the release member spring 18 is connected to the bracket 11, and the other end is connected to the release member 17.

[0045] like Figure 4 and 8 As shown, the transmission component 14 is an integrally formed structure, including a transmission component rotating part 141. The transmission component rotating part 141 is rotatably mounted on the bracket 11 via a transmission component rotating shaft 140. The transmission component rotating part 141 extends to both sides to form a first transmission arm 142 that cooperates with the traction rod 12 and a second transmission arm 143 that cooperates with the armature 15. The second transmission arm 143 is provided with a transmission groove 144. The armature 15 is provided with a drive arm 153 whose end is inserted into the transmission groove 144. By having the end of the drive arm 153 of the armature 15 inserted into the transmission groove 144 of the transmission component 14, the drive arm 153 of the armature 15 and the second transmission arm 143 of the transmission component 14 are linked and connected, making the cooperation between the armature 15 and the transmission component 14 reliable and stable, and easy to assemble.

[0046] like Figure 4 and 9As shown, the armature 15 is an integrally formed structure, including an armature rotating part 151. The armature rotating part 151 has a U-shaped structure. Both sides of the armature rotating part 151 are rotatably mounted on the bracket 11 through the armature rotating shaft 150. The bottom edge of the armature rotating part 151 extends downward to form the suction part 152. The top edge of the bottom edge of the armature rotating part 151 extends towards the opening to form a drive arm 153 that cooperates with the transmission member 14. The drive arm 153 has an L-shaped structure. One end is perpendicularly connected to the bottom edge of the armature rotating part 151 and is located on one side of the second transmission arm 143 of the transmission member 14. The other end is inserted into the transmission groove 144 of the transmission member 14. The armature spring 16 is a torsion spring, comprising two spring bodies sleeved on the armature shaft 150 and located within the opening of the armature rotating part 151. One end of the two spring bodies is connected together to form a U-shaped structure abutting against the bottom edge of the armature rotating part 151. The other ends of the two spring bodies are respectively connected to the transmission shaft 140 and the transmission rotating part 141. The armature 15 has a simple structure, which facilitates both compact assembly with the transmission part 14 and large-clearance assembly with the magnetic yoke 21.

[0047] like Figure 4 and Figure 10 As shown, the magnetic yoke 21 of the second module 2 is an integrally formed U-shaped structure. The opening of the magnetic yoke 21 is opposite to the attraction part 152 of the armature 15. The edges of both sides of the magnetic yoke 21 are provided with attraction inclined surfaces 211 that are spaced apart from the attraction part 152. One end of the bimetallic strip 23 is inserted into the cavity and stacked in sequence with the bottom edge of the temperature sensing element 22 and the magnetic yoke 21 and riveted together. The other end of the bimetallic strip 23 passes through the communication port 113a of the bracket 11 and is driven and engaged with the second driven arm 124 of the traction rod 12. The second module 2 has a simple structure, is easy to assemble, and has a compact layout.

[0048] like Figure 4 As shown, when a short circuit fault occurs in the circuit breaker, the armature 15 overcomes the spring force of the armature spring 16 and rotates clockwise around the armature shaft 150, causing the armature 15's attraction part 152 to engage with the attraction inclined surface 211 of the magnetic yoke 21. At the same time, the drive arm 153 of the armature 15 drives the second transmission arm 143 of the transmission component 14 to rotate counterclockwise around the transmission component shaft 140, so that the first transmission arm 142 of the transmission component 14 strikes the first driven arm 122 of the traction rod 12, thereby causing the traction rod 12 to overcome the spring force of the traction rod spring 13 and rotate clockwise, so that the trip arm 123 of the traction rod 12 unlocks and trips with the limiting surface 171 of the tripping component 17, thereby enabling the tripping component 17 to strike the operating mechanism 4 again, causing the operating mechanism to trip, thus tripping the circuit breaker.

[0049] When an overload fault occurs in the circuit breaker, the bimetallic strip 23 is heated by the current and bends to a certain extent, contacting the second driven arm 124 of the traction rod 12 and driving the traction rod 12 to overcome the spring force of the traction rod spring 13 and rotate clockwise. This causes the tripping arm 123 of the traction rod 12 to unlock and trip with the limiting surface 171 of the tripping member 17, thereby enabling the tripping member 17 to strike the operating mechanism 4 again, causing the operating mechanism to trip, and thus tripping the circuit breaker.

[0050] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0051] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A tripping structure, characterized in that: The system includes a first module (1) and a second module (2). The first module (1) includes a bracket (11), a traction rod (12) rotatably mounted on the bracket (11), a transmission component (14), and an armature (15), as well as a traction rod spring (13) that provides elastic restoring force to the traction rod (12) and an armature spring (16) that provides elastic restoring force to the armature (15). The armature (15) is driven to connect with the traction rod (12) through the transmission component (14). The traction rod (12) can drive the operating mechanism (4) to disengage. The second module (2) includes a temperature sensing element (22) and a magnetic yoke (21) located below the bracket (11). The armature (15) extends downward to form an attractive part (152) that is spaced opposite to the magnetic yoke (21). The attractive part (152) and the magnetic yoke (21) form a cavity for the temperature sensing element (22) to pass through. The part of the temperature sensing element (22) that passes through the cavity is fixedly connected to the magnetic yoke (21).

2. The tripping structure according to claim 1, characterized in that: The bracket (11) is provided with a first mounting cavity (111) for mounting the traction rod (12) and a second mounting cavity (112) located below the first mounting cavity (111). The first mounting cavity (111) and the second mounting cavity (112) are connected by a connecting port (113a). The transmission component (14) is installed in the second mounting cavity (112) and is provided with a first transmission arm (142) that passes through the connecting port (113a) and cooperates with the traction rod (12). The armature (15) is installed in the second mounting cavity (112) and the suction part (152) of the armature (15) extends out of the second mounting cavity (112).

3. The tripping structure according to claim 2, characterized in that: The bracket (11) includes a base plate (113) and two side plates (114) vertically disposed on both sides of the base plate (113). The base plate (113) and the two side plates (114) form a first mounting cavity (111). The base plate (113) extends downward to form at least two lower mounting arms (115). The two lower mounting arms (115) are spaced apart and opposite to each other. The two lower mounting arms (115) form a second mounting cavity (112) between them.

4. The tripping structure according to claim 1, characterized in that: The traction rod (12) includes a traction rod rotating part (121), which is rotatably mounted on the bracket (11) via a traction rod pivot (120). The traction rod rotating part (121) extends downward to form a first driven arm (122) that cooperates with the transmission member (14), and the traction rod rotating part (121) extends backward to form a release arm (123) for disengaging the operating mechanism (4).

5. The tripping structure according to claim 1, characterized in that: The first module (1) further includes a release member (17) rotatably mounted on the bracket (11). A release member spring (18) is provided between the release member (17) and the bracket (11) to provide elastic restoring force for the release member (17). The traction rod (12) drives the operating mechanism (4) to release through the release member (17). The release member (17) and the traction rod (12) are in a limiting cooperation.

6. The tripping structure according to claim 5, characterized in that: The bracket (11) includes a rear plate (116) that serves as the rear sidewall of the first mounting cavity (111). The rear plate (116) extends rearward to form two spaced-apart rear mounting arms (117). The release member (17) is rotatably mounted between the two rear mounting arms (117) via a release member pivot (170). One end of the release member (17) extends into the first mounting cavity (111) through a perforation (116a) on the rear plate (116) and is provided with a limiting surface (171) that cooperates with the traction rod (12).

7. The tripping structure according to claim 1, characterized in that: The transmission component (14) includes a transmission component rotating part (141), which is rotatably mounted on the bracket (11) via a transmission component rotating shaft (140). The transmission component rotating part (141) extends to both sides to form a first transmission arm (142) that cooperates with the traction rod (12) and a second transmission arm (143) that cooperates with the armature (15). The second transmission arm (143) is provided with a transmission groove (144), and the armature (15) is provided with a drive arm (153) whose end is inserted into the transmission groove (144).

8. The tripping structure according to claim 1, characterized in that: The armature (15) includes an armature rotating part (151), which has a U-shaped structure. Both sides of the armature rotating part (151) are rotatably mounted on the bracket (11) via armature rotating shafts (150). The bottom edge of the armature rotating part (151) extends downward to form the suction part (152), and the top edge of the bottom edge of the armature rotating part (151) extends toward the opening to form a drive arm (153) that cooperates with the transmission member (14).

9. The tripping structure according to claim 1, characterized in that: The second module (2) also includes a bimetallic strip (23), one end of which is inserted into the cavity and stacked and riveted together with the temperature sensing element (22) and the magnetic yoke (21) in sequence, and the other end of which is driven to cooperate with the traction rod (12).

10. The tripping structure according to claim 1, characterized in that: The magnetic yoke (21) has a U-shaped structure. The opening of the magnetic yoke (21) is opposite to the attraction part (152) of the armature (15). The edges of both sides of the magnetic yoke (21) are provided with attraction inclined surfaces (211) that are spaced apart from the attraction part (152). The bottom edge of the magnetic yoke (21) is riveted to the temperature sensing element (22).

11. A circuit breaker, characterized in that: Includes the tripping structure as described in any one of claims 1-10.

12. The circuit breaker according to claim 11, characterized in that: It also includes a base (3), an operating mechanism (4) mounted on the base (3), and at least one conductive unit (5). Each conductive unit (5) includes a unit housing mounted on the base (3) and a contact mechanism installed inside the unit housing. The contact mechanism includes a cooperating moving contact and a stationary contact. The operating mechanism (4) is driven to connect with the moving contact and can drive the moving contact to close or open with the stationary contact. The temperature sensing element (22) of the tripping structure is a terminal block for directly connecting to an external conductor. The temperature sensing element (22) is electrically connected to the contact mechanism. When a short circuit fault occurs in the circuit breaker, the armature (15) of the tripping structure cooperates with the traction rod (12) to drive the operating mechanism (4) to trip.

13. The circuit breaker according to claim 12, characterized in that: The unit housing has an L-shaped structure. The unit housing is located on the rear side of the tripping structure. The opening of the unit housing faces the tripping structure. A support platform is provided on the inner side of the end of the unit housing closest to the tripping structure. The operating mechanism (4) is located inside the opening of the unit housing. The bracket (11) of the tripping structure is installed on the base (3). The bracket (11) extends backward to form a rear support plate (118). The rear support plate (118) is placed on the support platform of the unit housing.

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