Dynamic response circuit breaker tripping mechanism

Abstract

The invention relates to the technical field of circuit breakers, and discloses a dynamic response circuit breaker tripping mechanism, which comprises a shell, a handle, a static contact group and a dynamic contact group, the static contact group is fixedly arranged in the shell, the handle is rotatably arranged in the shell, the handle is rotatably connected with a tripping structure, the dynamic contact group is fixedly arranged on the tripping structure, and the dynamic contact group is fixedly arranged on the shell. An arc extinguish chamber is further arranged in the shell, an airflow guide channel is formed in the arc extinguish chamber, an annular pneumatic sleeve is arranged between the shell and the handle, the annular pneumatic sleeve is communicated with the airflow guide channel, a sliding baffle is arranged at the bottom of the handle, the handle is in sealed connection with the annular pneumatic sleeve, and an air leakage opening communicated with the interior of the shell is formed in the bottom of the annular pneumatic sleeve; according to the invention, closing assistance is activated only when the arc is generated, the closing or breaking action of the static contact group and the dynamic contact group is accelerated, the duration of the arc is effectively shortened, the ablation risk of the contacts is reduced, and dynamic assistance according to conditions is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a dynamic response circuit breaker tripping mechanism. Background Art

[0002] Circuit breakers are core control devices used to protect electrical circuits in power systems. They automatically cut off current when a fault occurs, preventing equipment damage and potential safety incidents. Circuit breakers achieve precise control through a dual thermal and magnetic protection mechanism. Their internal structure comprises a thermal trip element and an electromagnetic trip unit. The thermal trip element utilizes the bending of a bimetallic strip due to heat, triggering a mechanical switch to disconnect the circuit when a line is overloaded (e.g., a 20% current overload lasting several minutes). The electromagnetic trip unit utilizes electromagnetic induction to disconnect the circuit within 0.02 seconds during a short circuit (when the current surges to thousands of amperes). The core arc extinguishing system uses metal grids to divide the arc and gas purge, extinguishing high-temperature arcs of tens of thousands of degrees Celsius within 15 milliseconds, ensuring safe disconnection.

[0003] However, existing circuit breakers present the following technical challenges during installation and use: Arcing is prone to occur between the moving and stationary contacts during closing and opening operations. This arcing generates transient high temperatures (up to 20,000°C), causing contact material corrosion and insulation failure. Shock waves can also cause mechanical deformation or even rupture. This is particularly true during the closing process, where slow closing speeds significantly increase the probability of a pre-breakdown arc. Furthermore, existing miniature circuit breakers generally lack real-time arc monitoring and closing speed feedback mechanisms, making it difficult for users to intuitively determine whether an arc is forming during contact contact and whether the closing speed complies with regulations.

[0004] For example, Chinese patent CN202210364531.3 proposes a circuit breaker and a power supply cabinet and power assist method with such a structure, but its power assist mechanism adopts a permanent power assist mode, which will still generate power assist under conditions without arc risk, causing wear and degradation of mechanical components. In addition, this technical solution does not detect arcs and cannot achieve dynamic power assist adjustment based on the arc state. When the contact surface is clean and free of oxide layer or under low load current conditions, if the closing operating force has met the contact closure power requirements, the existing power assist mechanism will still apply redundant auxiliary driving force, causing the mechanical impact load at the end of the contact closure to exceed the design threshold, especially generating unnecessary momentum impact in the contact pre-contact stage, accelerating the fatigue wear of the contact spring and linkage mechanism, and reducing the mechanical life of the equipment. Summary of the Invention

[0005] (1) Technical problems solved: In response to the shortcomings of the existing technology, the present invention provides a dynamic response circuit breaker tripping mechanism, which has the advantages of being able to dynamically adjust the closing force according to the arc state and intuitively observe whether an arc is generated. This solves the problem that the closing force of the existing circuit breaker is prone to component wear and it is impossible to intuitively observe whether an arc is generated in the circuit breaker.

[0006] (II) Technical solution: In order to achieve the above-mentioned purpose of being able to dynamically adjust the closing assistance according to the arc state and visually observe whether the arc is generated, the present invention provides the following technical solution: a dynamic response circuit breaker tripping mechanism, comprising a housing, a handle, a static contact group, and a dynamic contact group, wherein the static contact group is fixedly installed in the housing, the handle is rotatably installed in the housing, the handle is rotatably connected to a tripping structure, the dynamic contact group is fixedly installed on the tripping structure, an arc extinguishing chamber is further provided in the housing, an airflow guide channel is opened on the arc extinguishing chamber, a hollow annular pneumatic sleeve is provided between the housing and the handle, and the annular pneumatic sleeve is connected to the airflow guide channel. The flow guide channels are connected, and a sliding baffle is provided at the bottom of the handle which is slidably connected to the annular pneumatic sleeve. A limit plate for limiting the sliding stroke of the sliding baffle is also provided in the annular pneumatic sleeve. The handle and the annular pneumatic sleeve are sealed. A vent connected to the outer shell is provided at the bottom of the annular pneumatic sleeve, and the vent is provided on the sliding path of the sliding baffle. When an arc is formed between the static contact group and the dynamic contact group, expanded gas is generated inside the arc extinguishing chamber and flows along the air flow guide channel and pushes the sliding baffle to move axially. When the sliding baffle moves to the position of the vent, the air flow guide channel and the vent form a continuous pressure relief channel.

[0007] Preferably, the tripping structure adopts a connecting rod structure, and the tripping structure has a pressure inflection point, and the tripping structure is slidably connected to the housing; the sliding baffle forms an axial displacement stroke in the annular pneumatic sleeve, and the distance from the start to the end of the stroke is equal to the arc length displacement converted from the rotation angle of the handle from the open position to the closed position; during the closing process of the handle, the sliding baffle slides along the annular pneumatic sleeve, and when the dynamic contact group and the static contact group are in contact position, the critical position of the pressure inflection point of the tripping structure forms an axially aligned connection state, so that when and only when the handle drives the sliding baffle to rotate to the pressure inflection point position of the tripping structure, the airflow guide channel and the air vent form a maximum flow cross-sectional area.

[0008] Preferably, the air vent is a grille type.

[0009] Preferably, a limit block is provided at the inlet end of the airflow guide channel to limit the circumferential movement of the sliding baffle; when the handle is in the open-lock state, the initial position of the sliding baffle maintains a preset distance from the limit block, and the axial displacement path of the sliding baffle is limited to the inner wall range of the annular pneumatic sleeve; when the sliding baffle produces excessive displacement due to abnormal operation, its end face forms a surface contact constraint with the limit block.

[0010] Preferably, a fan is rotatably connected between the handle and the housing, and the fan is arranged below the air vent. When the air vent is opened, the gas in the air vent drives the fan to rotate to reduce the air pressure of the air flow; the limit plate and the annular pneumatic sleeve are coaxially rotatably connected, and a return spring is connected between the limit plate and the annular pneumatic sleeve. A raised annular limit boss is provided in the annular pneumatic sleeve, and a gap is formed between the annular limit boss and the sliding baffle. Isolation plates are fixedly connected to both ends of the limit plate, and an exhaust port connected to the fan is provided at the bottom of the limit plate; when the handle is in the open state, the The limit plate is in the initial state, the isolation plate at one end is flush with the entrance of the airflow guide channel, and the isolation plate at the other end is pressed tightly against the annular limit boss; when the handle is in the closed state, the isolation plate at one end is pushed away from the annular limit boss by the sliding baffle, and the isolation plate at the other end slides along the annular pneumatic sleeve, and connects the limit plate with the airflow guide channel. When the static contact group and the dynamic contact group form an arc, the expanded gas generated inside the arc extinguishing chamber pushes the limit plate to move circumferentially along the airflow guide channel, so that the isolation plate pushes the sliding baffle and drives the handle to open.

[0011] Preferably, a circumferential guide groove coaxial with the fan is provided on the shell, and a transparent fan-shaped filter is fixedly connected to one side of the shell, the fan-shaped filter is connected to the circumferential guide groove, and the surface of the fan is coated with a colored coating.

[0012] Preferably, a fixed shaft is provided between the handle and the shell, the fixed shaft is fixedly connected to the shell, the handle and the fixed shaft are rotationally connected, the annular pneumatic sleeve is fixedly connected to the fixed shaft, and a spring is provided between the handle and the fixed shaft.

[0013] Preferably, both the static contact group and the dynamic contact group are connected to wiring terminals.

[0014] (III) Beneficial Effects: Compared with the prior art, the present invention provides a dynamic response circuit breaker tripping mechanism, which has the following beneficial effects: 1. This dynamic response circuit breaker tripping mechanism, through the coordinated use of an arc extinguishing chamber structure and an annular pneumatic sleeve structure, activates the closing assist only when an arc is generated. The pneumatic assist is triggered at the moment of arc generation, accelerating the closing or disconnecting action of the static contact group and the dynamic contact group, effectively shortening the arc duration, reducing the risk of contact ablation, and achieving conditional dynamic assist. At the same time, during the closing process, the handle can obtain maximum assist at the pressure inflection point. The assist strength is dynamically matched with the arc energy, and the assist automatically decays after passing the inflection point, ensuring rapid closing between the static contact group and the dynamic contact group while avoiding excessive mechanical impact, greatly reducing structural fatigue wear, and significantly improving operational smoothness and mechanism durability.

[0015] 2. The dynamic response circuit breaker tripping mechanism uses a limit plate structure in conjunction with a sliding baffle structure. When an arc is generated during the tripping process, the limit plate is pushed by the expanding airflow to produce radial displacement, forming a secondary thrust compensation for the sliding baffle. This linkage enables the tripping action to obtain additional acceleration, significantly shortens the arc duration, and reduces the risk of welding between the static contact group and the dynamic contact group.

[0016] 3. The dynamic response circuit breaker tripping mechanism uses a fan structure in conjunction with a fan-shaped filter structure. When the airflow generated by the arc drives the fan to rotate, the fan creates a rotating color effect. The intuitive and visual changes in the fan's rotation state reflect in real time whether an arc has occurred, allowing the operator to directly determine whether the contact closure is in compliance, effectively preventing hidden arc damage caused by improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the three-dimensional structure of the dynamic response circuit breaker tripping mechanism of the present invention; Figure 2 It is a structural front view of the dynamic response circuit breaker tripping mechanism of the present invention; Figure 3 A top view of the structure of the dynamic response circuit breaker tripping mechanism of the present invention; Figure 4 for Figure 3 Middle AA section view; Figure 5 A schematic diagram of the position where the tripping structure of the present invention reaches the pressure inflection point; Figure 6 Schematic diagram of the position of the sliding baffle when the tripping structure of the present invention reaches the pressure inflection point; Figure 7 This is a schematic diagram of the structure after the handle is closed in the present invention; Figure 8 This is a schematic diagram of the fan structure in the present invention.

[0018] In the figure: 1. Housing; 11. Circumferential guide groove; 12. Fixed shaft; 2. Handle; 21. Sliding baffle; 3. Arc extinguishing chamber; 31. Air flow guide channel; 4. Annular pneumatic sleeve; 41. Air vent; 42. Limit block; 43. Annular limit boss; 5. Limit disk; 51. Isolation plate; 52. Exhaust port; 6. Fan; 61. Fan-shaped filter; 7. Static contact group; 8. Dynamic contact group; 9. Tripping structure. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-Figure 7A dynamic-response circuit breaker tripping mechanism includes a housing 1, a handle 2, a static contact group 7, and a dynamic contact group 8. The static contact group 7 is fixedly mounted within the housing 1. The static contact group 7 is the part of the circuit breaker responsible for contacting and separating with the dynamic contact group 8, enabling the circuit to be switched on and off. The coordination of the static contact group 7 and the dynamic contact group 8 controls the switching of current, thereby achieving circuit protection and control functions. The handle 2 is rotatably mounted within the housing 1 and is rotatably connected to a tripping structure 9. The handle 2 is a direct component for operating the circuit breaker. Rotating the handle 2 controls the movement of the tripping structure 9, thereby enabling the dynamic contact group 8 and the static contact group 7 to contact and separate. The dynamic contact group 8 is fixedly mounted on the tripping structure 9. The housing 1 also includes an arc extinguishing chamber 3, a component of the circuit breaker used to extinguish arcs. When the dynamic contact group 8 and the static contact group 7 separate or contact, an arc may be generated. The high temperature and energy of the arc can damage the circuit breaker. The arc extinguishing chamber 3 is provided with a metal grid array and other structures, which can divide the arc and accelerate its cooling and extinguishing. The arc extinguishing chamber 3 is provided with an airflow guide channel 31, which is used to guide the gas flow in the arc extinguishing chamber 3 so that it flows to the annular pneumatic sleeve 4. A hollow annular pneumatic sleeve 4 is provided between the housing 1 and the handle 2. The annular pneumatic sleeve 4 is connected to the airflow guide channel 31. A sliding baffle 21 is provided at the bottom of the handle 2 and is slidably connected to the annular pneumatic sleeve 4. Based on the principle of gas expansion in the arc extinguishing chamber 3 when an arc is generated, the expanded gas is introduced into the annular pneumatic sleeve 4, pushing the sliding baffle 21 to slide along the annular pneumatic sleeve 4. The movement of the sliding baffle 21 can apply an auxiliary driving force to the handle 2, accelerating the contact or separation action of the dynamic contact group 8 and the static contact group 7, thereby shortening the arc duration and reducing the risk of contact ablation. The annular pneumatic sleeve 4 is also equipped with a limit plate 5 that limits the sliding travel of the sliding baffle 21. The handle 2 is sealed to the annular pneumatic sleeve 4. This seal prevents the gas inside the annular pneumatic sleeve 4 from leaking into the external environment, thereby maintaining a stable air pressure inside the annular pneumatic sleeve 4. This improves the effectiveness of using air pressure to propel the sliding baffle 21. A vent 41 is provided at the bottom of the annular pneumatic sleeve 4, communicating with the interior of the housing 1. This vent 41 is located along the sliding path of the sliding baffle 21 and is used to release the air pressure inside the annular pneumatic sleeve 4 when the sliding baffle 21 moves to a specific position. When the sliding baffle 21 moves to the position of the air vent 41, it will open the air vent 41 so that the air flow guide channel 31 and the air vent 41 form a continuous pressure relief channel, thereby reducing the air pressure in the annular pneumatic sleeve 4 and reducing the power applied to the handle 2; when the static contact group 7 and the dynamic contact group 8 form an arc, the expanded gas generated in the arc extinguishing chamber 3 flows along the air flow guide channel 31 and pushes the sliding baffle 21 to move axially, such as Figure 4-Figure 7As shown, when the sliding baffle 21 moves to the air vent 41, the airflow guide channel 31 and the air vent 41 form a continuous pressure relief channel. The air vent 41 is a grille-shaped air vent 41. The grille-shaped air vent 41 can evenly release the gas pressure within the annular pneumatic sleeve 4. At the same time, the grille-shaped air vent 41 can also limit the flow rate of the gas, ensuring that the force applied to the sliding baffle 21 during rotation is evenly reduced.

[0021] See also Figure 1-Figure 7 , the tripping structure 9 adopts a connecting rod structure, and the tripping structure 9 has a pressure inflection point. The tripping structure 9 is slidably connected to the housing 1. Since the tripping structure 9 has a pressure inflection point, during the closing process, when the handle 2 moves to the pressure inflection point position, the required closing operating force reaches the peak. By combining the design of the annular pneumatic sleeve 4 and the sliding baffle 21, when the handle 2 moves to the pressure inflection point position, the airflow guide channel 31 and the air vent 41 form the maximum flow cross-sectional area, and the airflow kinetic energy is fully converted into mechanical assistance, which significantly reduces the operating force of the handle 2 at the pressure inflection point position. The sliding baffle 21 forms an axial displacement stroke in the annular pneumatic sleeve 4, and the distance from the start to the end of the stroke is equal to the arc length displacement converted from the rotation angle of the handle 2 from the open position to the closed position; during the closing process of the handle 2, the sliding baffle 21 slides along the annular pneumatic sleeve 4, and when it is in the contact position between the dynamic contact group 8 and the static contact group 7, as shown Figure 5 、 Figure 6 As shown, the critical position of the pressure inflection point of the tripping structure 9 forms an axially aligned communication state, so that when and only when the handle 2 drives the sliding baffle 21 to rotate to the pressure inflection point position of the tripping structure 9, the air flow guide channel 31 and the air release port 41 form the maximum flow cross-sectional area, as shown in FIG. Figure 6 .

[0022] See also Figure 4 and Figure 7 A limit block 42 is provided at the inlet end of the airflow guide channel 31 to limit the circumferential movement of the sliding baffle 21. By limiting the circumferential movement of the sliding baffle 21, it can be ensured that it moves according to a predetermined trajectory during the closing and opening processes. When the handle 2 is in the opening locking state, the initial position of the sliding baffle 21 maintains a preset distance from the limit block 42, and the axial displacement path of the sliding baffle 21 is limited to the inner wall range of the annular pneumatic sleeve 4; when the sliding baffle 21 produces excessive displacement due to abnormal operation, its end face forms a surface contact constraint with the limit block 42.

[0023] See also Figure 1 、 Figure 8A fan 6 is rotatably connected between the handle 2 and the housing 1. This fan 6 is located below the air vent 41. When the air vent 41 is open, the gas inside drives the fan 6 to rotate, reducing the air pressure. When the air vent 41 is open again, the gas inside flows out, driving the fan 6 to rotate. The rotation of the fan 6 helps further reduce the air pressure, thereby optimizing arc extinguishing efficiency. Furthermore, by reducing the air pressure, the instantaneous impact pressure of the high-pressure gas generated by the arc on the internal structure of the circuit breaker can be reduced, protecting the equipment from damage. Figure 4-Figure 8 , the limit disk 5 is coaxially connected to the annular pneumatic sleeve 4 for rotation. During the opening process, when an arc is generated, the gas in the arc extinguishing chamber 3 expands and pushes the limit disk 5 to produce radial displacement. The limit disk 5 applies thrust to the sliding baffle 21 through the isolation plate 51, providing additional acceleration for the opening action, thereby shortening the arc duration and reducing the risk of contact welding. A reset spring is connected between the limit disk 5 and the annular pneumatic sleeve 4. The presence of the reset spring enables the limit disk 5 to automatically reset after completing the opening action. A raised annular limit boss 43 is provided in the annular pneumatic sleeve 4. There is a gap between the annular limit boss 43 and the sliding baffle 21. Isolation plates 51 are fixedly connected to both ends of the limit disk 5. An exhaust port 52 connected to the fan 6 is provided at the bottom of the limit disk 5; when the handle 2 is in the opening state, the limit disk 5 is in the initial state, and the isolation plate 51 at one end is flush with the entrance of the airflow guide channel 31, and the isolation plate 51 at the other end is flush with the entrance of the airflow guide channel 31. The isolation plate 51 at one end is pressed tightly against the annular limit boss 43; when the handle 2 is in the closed state, the isolation plate 51 at one end is pushed away from the annular limit boss 43 by the sliding baffle 21, and the isolation plate 51 at the other end slides along the annular pneumatic sleeve 4, and connects the limit plate 5 with the airflow guide channel 31. When the static contact group 7 and the dynamic contact group 8 form an arc, the expanded gas generated inside the arc extinguishing chamber 3 pushes the limit plate 5 to move circumferentially along the airflow guide channel 31, so that the isolation plate 51 pushes the sliding baffle 21 and drives the handle 2 to open. A circumferential guide groove 11 coaxial with the fan 6 is provided on the housing 1. The design of the circumferential guide groove 11 allows the gas inside the housing 1 to flow more smoothly, thereby improving the gas circulation efficiency. A transparent fan-shaped filter 61 is also fixedly connected to one side of the housing 1. The fan-shaped filter 61 is connected to the circumferential guide groove 11, and the surface of the fan 6 is coated with a colored coating. The transparent fan-shaped filter 61 allows the operator to visually observe the rotation status of the fan 6. When an arc occurs, the fan 6 rotates to create a rotating effect, allowing the operator to quickly determine the compliance of the operation. The colored coating on the surface of the fan 6 further enhances the visual effect, allowing the operator to more clearly observe the rotation status of the fan 6.

[0024] Please participate Figure 1-Figure 4A fixed shaft 12 is provided between the handle 2 and the housing 1. The fixed shaft 12 is fixedly connected to the housing 1. The handle 2 and the fixed shaft 12 are rotationally connected. The annular pneumatic sleeve 4 is fixedly connected to the fixed shaft 12. A spring is provided between the handle 2 and the fixed shaft 12 to provide a reset force for the handle 2. Both the static contact group 7 and the dynamic contact group 8 are connected to terminal blocks.

[0025] Working principle: During the closing process, if an arc is generated between the static contact group 7 and the dynamic contact group 8, the arc is quickly guided into the arc extinguishing chamber 3 through the action of the electromagnetic field. The arc extinguishing chamber 3 is a closed cavity structure, and a metal grid array of a specific shape is arranged inside it. Under the action of the high temperature of the arc, the volume of the gas expands rapidly. This expansion effect forms a significant pressure gradient in the closed space of the arc extinguishing chamber 3, forcing the high-temperature gas to flow in a directional manner along the preset airflow guide channel 31. Among them, the airflow guide channel 31 can adopt a Venturi tube structure to further accelerate the airflow movement, forming a high-speed airflow with a specific directionality and entering the annular pneumatic sleeve 4. The airflow then acts on the sliding baffle 21, pushing it to slide axially along the annular pneumatic sleeve 4, thereby applying an auxiliary driving force to the operating handle 2 in the same direction as the closing direction. During the initial closing phase, due to the pressure inflection point in the tripping structure 9, when the handle 2 moves to this point, the required closing force reaches its peak. At this point, the sliding baffle 21 precisely moves to the area corresponding to the vent 41, creating a maximum flow cross-sectional area between the airflow guide channel 31 and the vent 41. The kinetic energy of the airflow is fully converted into mechanical assistance, significantly reducing the operating force of the handle 2 at the pressure inflection point. After passing the pressure inflection point, the tripping structure 9 enters a force-locking state, significantly reducing the required closing force. The closing force is then converted to maintaining contact pressure. Simultaneously, the airflow weakens the sliding baffle 21, preventing mechanical shock from exceeding the design threshold and ensuring a smooth contact closure process. When the handle 2 is fully closed, the sliding baffle 21 drives the limit plate 5 to rotate circumferentially by pushing the isolation plate 51, so that the limit plate 5 is connected with the airflow guide channel 31, and the isolation plate 51 on the other side is locked with the limit block 42. The residual gas is discharged through the exhaust port 52 in the limit plate 5, completing the dynamic power assist closed loop, thereby activating the power assist when the closing speed is insufficient and an arc is generated. If no arc is generated, the mechanism remains in a non-intervention state, effectively reducing mechanical wear.

[0026] During the opening process, if an arc is generated, the arc will be guided into the arc extinguishing chamber 3, causing the gas in the arc extinguishing chamber 3 to heat up and expand, thereby generating flowing gas in the airflow guide channel 31. The flowing gas will flow into the limit plate 5 in the annular pneumatic sleeve 4, and at the same time generate thrust on the limit plate 5, and then generate thrust on the sliding baffle 21, thereby accelerating the opening movement of the handle 2 when an arc is generated. After the sliding baffle 21 moves, the limit plate 5 will be reset by the reset spring. At this time, the isolation plate 51 at one end is pressed tightly against the annular limit boss 43.

[0027] In addition, the airflow generated during the closing and opening process will drive the fan 6 to rotate through the vent 41 or the exhaust port. On the one hand, the arc extinguishing efficiency is optimized by adjusting the airflow pressure, which can effectively reduce the instantaneous impact pressure of the high-pressure gas generated by the arc on the internal structure of the circuit breaker. The static pressure of the airflow is reduced through energy conversion, avoiding deformation of the sealing components or stress overload at the mechanical connection due to a sudden increase in air pressure. On the other hand, the rotation status of the fan 6 is intuitively displayed through the transparent fan-shaped filter 61. The colored coating on the surface of the fan 6 further enhances the visual prompt effect, allowing the user to observe the arc generation in real time and thus judge the compliance of the operation.

[0028] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0029] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A dynamic response circuit breaker tripping mechanism, comprising a housing (1) and a handle (2), wherein a static contact group (7) is fixedly mounted in the housing (1), the handle (2) is rotatably mounted in the housing (1), the handle (2) is rotatably connected to a tripping structure (9), a dynamic contact group (8) is fixedly mounted on the tripping structure (9), and an arc extinguishing chamber (3) is provided in the housing (1), characterized in that: An airflow guide channel (31) is provided on the arc extinguishing chamber (3); an annular pneumatic sleeve (4) in communication with the airflow guide channel (31) is provided between the housing (1) and the handle (2); a sliding baffle (21) in sliding connection with the annular pneumatic sleeve (4) is provided at the bottom of the handle (2); an air release port (41) in communication with the housing (1) is provided at the bottom of the annular pneumatic sleeve (4); the air release port (41) is provided on the sliding path of the sliding baffle (21); when the static contact group (7) and the dynamic contact group (8) form an arc, the gas in the arc extinguishing chamber (3) pushes the sliding baffle (21) along the airflow guide channel (31); when the sliding baffle (21) moves to the position of the air release port (41), the airflow guide channel (31) and the air release port (41) form a continuous pressure relief channel.

2. A dynamic response circuit breaker tripping mechanism according to claim 1, characterized in that: The tripping structure (9) adopts a connecting rod structure, and the tripping structure (9) has a pressure inflection point, and the tripping structure (9) is slidably connected to the housing (1); the sliding baffle (21) forms an axial displacement stroke in the annular pneumatic sleeve (4), and the distance from the start to the end of the displacement stroke is equal to the arc length displacement converted from the rotation angle of the handle (2) from the open position to the closed position; during the closing process of the handle (2), the sliding baffle (21) slides along the annular pneumatic sleeve (4), and when the dynamic contact group (8) and the static contact group (7) are in contact, the critical position of the pressure inflection point of the tripping structure (9) forms an axially aligned connection state, so that when and only when the handle (2) drives the sliding baffle (21) to rotate to the pressure inflection point position of the tripping structure (9), the airflow guide channel (31) and the air release port (41) form a maximum flow cross-sectional area.

3. The dynamic response circuit breaker tripping mechanism according to claim 2, characterized in that: The air vent (41) is a grid type.

4. The dynamic response circuit breaker tripping mechanism according to claim 1, characterized in that: A limit block (42) is provided at the inlet end of the airflow guide channel (31) for limiting the circumferential movement of the sliding baffle (21); when the handle (2) is in the open-lock state, the initial position of the sliding baffle (21) maintains a preset distance from the limit block (42), and the axial displacement path of the sliding baffle (21) is limited to the inner wall range of the annular pneumatic sleeve (4); when the sliding baffle (21) produces excessive displacement due to abnormal operation, the end face of the sliding baffle (21) forms a surface contact constraint with the limit block (42).

5. The dynamic response circuit breaker tripping mechanism according to claim 1, characterized in that: A fan (6) is rotatably connected between the handle (2) and the housing (1), and the fan (6) is arranged below the air vent (41). When the air vent (41) is opened, the gas in the air vent (41) drives the fan (6) to rotate so as to reduce the air pressure of the air flow. A limit plate (5) is also provided in the annular pneumatic sleeve (4) for limiting the sliding stroke of the sliding baffle (21). The limit plate (5) and the annular pneumatic sleeve (4) are coaxially rotatably connected. A return spring is connected between the limit plate (5) and the annular pneumatic sleeve (4). A raised annular limit boss (43) is provided in the annular pneumatic sleeve (4), and there is a gap between the annular limit boss (43) and the sliding baffle (21). Isolation plates (51) are fixedly connected at both ends of the limit plate (5), and an exhaust port (52) connected to the fan (6) is provided at the bottom of the limit plate (5). When the handle (2) is in the opening state and the limit plate (5) is in the initial opening state, the isolation plate (51) at one end is flush with the entrance of the airflow guide channel (31), and the isolation plate (51) at the other end is pressed against the annular limit boss (43); when the handle (2) is in the closing state, the isolation plate (51) at one end is pushed away from the annular limit boss (43) by the sliding baffle (21), and the isolation plate (51) at the other end slides along the annular pneumatic sleeve (4), and connects the limit plate (5) with the airflow guide channel (31). When the static contact group (7) and the dynamic contact group (8) generate an arc, the expanded gas generated inside the arc extinguishing chamber (3) pushes the limit plate (5) along the airflow guide channel (31) to generate a circumferential movement, so that the isolation plate (51) pushes the sliding baffle (21) and drives the handle (2) to open.

6. The dynamic response circuit breaker tripping mechanism according to claim 5, characterized in that: The housing (1) is provided with a circumferential flow guide groove (11) coaxial with the fan (6).

7. The dynamic response circuit breaker tripping mechanism according to claim 5, characterized in that: A transparent fan-shaped filter (61) is fixedly connected to one side of the housing (1), and the surface of the fan (6) is coated with a colored coating.

8. The dynamic response circuit breaker tripping mechanism according to claim 1, characterized in that: A fixed shaft (12) is provided between the handle (2) and the housing (1), the fixed shaft (12) is fixedly connected to the housing (1), the handle (2) and the fixed shaft (12) are rotationally connected, the annular pneumatic sleeve (4) and the fixed shaft (12) are fixedly connected, and a spring is provided between the handle (2) and the fixed shaft (12).

9. The dynamic response circuit breaker tripping mechanism according to claim 1, characterized in that: The static contact group (7) and the dynamic contact group (8) are both connected to wiring terminals.

10. The dynamic response circuit breaker tripping mechanism according to claim 1, characterized in that: The handle (2) and the annular pneumatic sleeve (4) are sealed together.

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