A circuit breaker arc chamber structure

Abstract

The application relates to the field of circuit breaker devices, in particular to a circuit breaker arc-extinguishing chamber structure which comprises a shell, a moving rod and a static rod coaxially and slidably arranged in the shell and used for closing and opening, a support, the shell being fixedly connected to the support, an energy absorption unit used for buffering the impact force of the contact between the moving rod and the static rod during closing, and the energy absorption unit can also reduce the separation time of the moving rod and the static rod during opening; during closing, the support and a linkage frame are synchronously abutted together and the static rod is passively moved through the energy absorption assembly, the closing impact force brought by the heavy contact system is obviously relieved, the conductivity and arc-extinguishing reliability of the arc-extinguishing chamber are protected; during opening, the energy absorption assembly actively pushes the moving rod to quickly move away from the static rod, the opening speed caused by the increase of the contact mass is effectively compensated, and the arc can be ensured to be timely extinguished.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker equipment, specifically a circuit breaker arc-extinguishing chamber structure. Background Technology

[0002] A vacuum circuit breaker is a common type of power switching equipment. Its main function is to connect or disconnect current when the power grid is running, protecting electrical equipment and personal safety. Its core component is a sealed vacuum interrupter chamber, which contains a pair of contacts that can be separated and closed, consisting of a moving contact and a stationary contact. Because the interrupter chamber maintains a high vacuum state, the electric arc generated when the contacts are opened can be extinguished quickly, thereby achieving safe power disconnection.

[0003] When a vacuum circuit breaker is in operation, during the closing process, the operating mechanism pushes the moving contact toward the stationary contact to make contact and connect the circuit; during the opening process, the operating mechanism pulls the moving contact away from the stationary contact, an electric arc is generated between the contacts and extinguished when the current crosses zero, and the circuit is broken. The closing speed and opening speed are key indicators affecting the performance of the circuit breaker.

[0004] In recent years, in order to meet the requirements of higher voltage and larger current, vacuum circuit breakers have adopted heavier cup-shaped longitudinal magnetic contacts. Actual tests show that when the mass of the moving contact system increases from 4 kg to 12 kg, the opening speed decreases from 6.13 m / s to 3.50 m / s, a decrease of more than 40%. At the same time, the momentum when the contact reaches the fully separated position increases from 12.26 kg·m / s to 21.01 kg·m / s, an increase of more than 70%. Correspondingly, the momentum carried by the moving contact system during closing also increases significantly (an increase of more than 70%).

[0005] The above changes lead to the following technical problems: First, the closing impact force increases significantly. The larger the mass of the contact, the stronger the impact force when it hits the stationary contact, which can easily cause plastic deformation or damage to the contact surface, affecting conductivity and arc extinguishing reliability. Second, the opening speed slows down significantly. The decrease in opening speed may cause the arc to not be extinguished in time, affecting the safety and reliability of the circuit breaker, especially when opening during short-circuit faults, which may cause breaking failure.

[0006] Therefore, how to effectively buffer the closing impact force and improve the opening speed when using a heavier contact system has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a circuit breaker arc-extinguishing chamber structure, including a shell, in which a moving rod and a stationary rod for closing and opening are slidably arranged coaxially, the structure also includes a bracket, the shell is fixedly connected to the bracket, the structure also includes an energy-absorbing unit for buffering the impact force of the contact between the moving rod and the stationary rod when closing, the energy-absorbing unit can also reduce the separation time of the moving rod and the stationary rod when opening.

[0008] The energy absorption unit includes a support frame that is insulated and locked to the end of the moving rod, a linkage frame that is insulated and locked to the end of the stationary rod, and a movable seat that is slidably arranged on the upper side of the support.

[0009] The support frame and the linkage frame are equipped with two sets of fastening components. When the circuit is closed, the support frame and the linkage frame abut against each other synchronously, and the fastening components automatically lock the support frame and the linkage frame together.

[0010] The movable base, support frame, and linkage frame are all equipped with energy-absorbing components. The energy-absorbing components absorb the kinetic energy of the moving rod when it is closed by passively moving the stationary rod. When the rod is opened, the energy-absorbing components actively push the moving rod away from the stationary rod quickly.

[0011] Preferably, insulation is provided between the support frame and the moving rod, and between the linkage frame and the stationary rod, and the support frame and the linkage frame themselves are made of high-hardness non-magnetic insulating material.

[0012] Preferably, the stationary rod and the moving rod are connected to external equipment via terminal blocks, and the portions of the stationary rod and the moving rod that protrude from the outer side of the housing are covered with an insulating coating.

[0013] Preferably, the fastening assembly includes a fastening groove formed on the support frame, and a fastening claw is slidably disposed on the linkage frame. When the upper end of the fastening claw is inserted into the fastening groove, the linkage frame and the support frame are locked together.

[0014] Preferably, the upper edge of the latch is sloping, and a return spring is provided between the latch and the linkage frame. The support frame moves down to contact the sloping surface of the latch, thereby pushing the latch to move and compressing the return spring.

[0015] Preferably, a connecting plate is fixedly installed on the lower side of the latch, and an electric cylinder for pushing the connecting plate and compressing the reset spring is fixedly installed on the linkage frame.

[0016] Preferably, the energy-absorbing component includes a buffer spring disposed between the lower part of the movable seat and the linkage frame. Initially, the buffer spring is in a pre-compressed state, at which time the upper side of the linkage frame abuts against the bracket, and the contact of the stationary rod is located in the middle of the housing.

[0017] Preferably, the energy absorption assembly further includes several electromagnets fixedly installed on the movable base, and neodymium magnets corresponding to the electromagnets are fixedly installed on the lower side of the support frame.

[0018] Preferably, when the circuit is closed, the magnetism on the upward side of the electromagnet and the magnetism on the downward side of the neodymium magnet are opposite, so that the buffer spring is compressed and absorbs kinetic energy, and the electromagnet attracts the support frame downward.

[0019] Preferably, the bracket is fixedly equipped with an electric cylinder two for driving the moving seat to rise and fall. When the circuit is opened, the direction of the electromagnet current is reversed, so that the electromagnet assists in pushing the support frame upward.

[0020] The beneficial effects of this invention are as follows: First, this invention employs a support frame and a moving rod that are fixedly connected and move synchronously, and a linkage frame and a stationary rod that are fixedly connected and move synchronously. When closing, the support frame and the linkage frame abut together synchronously, and the stationary rod is passively moved by the energy-absorbing component, thereby effectively absorbing the significantly increased kinetic energy carried by the moving rod when closing, significantly mitigating the closing impact force brought by the heavy contact system, avoiding plastic deformation or damage to the contact surface, and protecting the conductivity and arc-extinguishing reliability of the arc-extinguishing chamber. When opening, the energy-absorbing component actively pushes the moving rod away from the stationary rod quickly, effectively compensating for the decrease in opening speed caused by the increase in contact mass, ensuring that the arc can be extinguished in time, and improving the safety and breaking capacity of the circuit breaker.

[0021] Second, this invention employs a latching claw that cooperates with a latching groove on the support frame. When the moving rod and stationary rod contact to close the circuit, the upper end of the latching claw automatically inserts into the latching groove, locking the linkage frame and the support frame together. This effectively prevents the moving rod and stationary rod from separating due to inertia after the circuit is closed, avoiding unreliable closing and arc reignition caused by contact bounce, thus ensuring the stability and continuity of the closed state.

[0022] Third, this invention employs a moving rod that pushes a linkage frame through a support frame, which in turn compresses a buffer spring, thereby converting and absorbing the closing kinetic energy. Simultaneously, an electromagnet fixedly mounted on a movable base attracts a neodymium magnet during closing, suppressing the bouncing of the connected moving and stationary rods. During opening, the current direction of the electromagnet is reversed, causing it to generate an upward repulsive force on the neodymium magnet, assisting in pushing the support frame and moving rod upward quickly, thus achieving rapid opening, effectively reducing opening time, and improving the circuit breaker's breaking response speed and mechanical operation efficiency. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention when the circuit is closed;

[0025] Figure 2 This is a schematic diagram of the overall structure of the present invention during circuit breaker tripping;

[0026] Figure 3 This is a partial structural schematic diagram of the present invention when buffering the impact force of the moving rod;

[0027] Figure 4 This is a structural schematic diagram of the moving rod, stationary rod, support frame, and linkage frame in this invention;

[0028] Figure 5 This is a partial structural diagram of the bracket, movable seat, electric cylinder II, and outer shell in this invention.

[0029] In the diagram: 1. Outer shell; 2. Moving rod; 3. Stationary rod; 4. Bracket; 5. Energy absorption unit; 51. Support frame; 52. Linkage frame; 53. Moving seat; 54. Fastening assembly; 55. Energy absorption assembly; 541. Claw; 542. Connecting plate; 543. Electric cylinder one; 551. Electromagnet; 552. Neodymium magnet; 553. Electric cylinder two. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0031] See Figure 1 and Figure 2 A circuit breaker arc-extinguishing chamber structure includes a housing 1, within which a moving rod 2 and a stationary rod 3 for closing and opening are coaxially slidably disposed. The structure also includes a bracket 4, on which the housing 1 is fixedly connected. The structure further includes an energy-absorbing unit 5 for buffering the contact impact force between the moving rod 2 and the stationary rod 3 during closing. The energy-absorbing unit 5 can also reduce the separation time between the moving rod 2 and the stationary rod 3 during opening.

[0032] When closing the circuit, the external operating mechanism moves the moving rod 2 closer to the stationary rod 3, causing the cup-shaped longitudinal magnetic contact on the moving rod 2 to come into contact with the cup-shaped longitudinal magnetic contact on the stationary rod 3, thereby completing the closing. At the same time, when closing the circuit, the energy absorption unit 5 passively moves the stationary rod 3 to buffer the contact impact force of the moving rod 2 on the stationary rod 3 during the closing process. When opening the circuit, the energy absorption unit 5 can assist in pushing the moving rod 2 to move upward quickly, thereby achieving rapid opening.

[0033] It should be noted that in this embodiment, the moving rod 2, the outer casing 1, and the stationary rod 3 are conventional configurations of existing vacuum circuit breakers, and the outer casing 1 contains the other components of existing vacuum circuit breakers. Therefore, these will not be described in detail in this invention, and they are not shown in the accompanying drawings.

[0034] See Figure 1 , Figure 2 and Figure 3 The energy absorption unit 5 includes a support frame 51 that is insulated and locked to the end of the moving rod 2, a linkage frame 52 that is insulated and locked to the end of the stationary rod 3, and a movable seat 53 that is slidably arranged on the upper side of the support 4.

[0035] Continue reading Figure 1 , Figure 2 and Figure 3 The movable base 53, the support frame 51 and the linkage frame 52 are all equipped with an energy absorption component 55. The energy absorption component 55 absorbs the kinetic energy of the moving rod 2 when it is closed by passively moving the stationary rod 3. When it is opened, the energy absorption component 55 actively pushes the moving rod 2 away from the stationary rod 3.

[0036] When closing the circuit, the moving rod 2 drives the support frame 51 to move closer to the linkage frame 52. When the moving rod 2 moves to contact the stationary rod 3, the impact force of the moving rod 2 acts on the stationary rod 3, causing the moving rod 2 to push the stationary rod 3 downward. The stationary rod 3 drives the linkage frame 52 to move downward passively, and the energy absorption component 55 absorbs the kinetic energy of the moving rod 2 when closing the circuit, which significantly reduces the closing impact force brought by the heavy contact system, avoids plastic deformation or damage to the contact surface, and protects the conductivity and arc extinguishing reliability of the arc extinguishing chamber.

[0037] When the circuit breaker is tripped, the energy-absorbing component 55 actively pushes the support frame 51 upward, causing the support frame 51 to drive the moving rod 2 away from the stationary rod 3 quickly. This effectively compensates for the decrease in tripping speed caused by the increase in contact mass, ensuring that the arc can be extinguished in time and improving the safety and breaking capacity of the circuit breaker.

[0038] Continue reading Figure 1 , Figure 2 and Figure 3 The support frame 51 and the linkage frame 52 are equipped with two sets of fastening components 54. When the moving rod 2 moves to contact the stationary rod 3, the support frame 51 and the linkage frame 52 abut together at the same time. Then the fastening components 54 automatically lock the support frame 51 and the linkage frame 52 together, effectively preventing the moving rod 2 and the stationary rod 3 from separating due to inertia after the closing is completed. This avoids unreliable closing and arc reignition caused by contact bounce, ensuring the stability and continuity of the closing state.

[0039] To prevent electrical leakage from the moving rod 2 and the stationary rod 3, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 and Figure 4 Insulation is provided between the support frame 51 and the moving rod 2, and between the linkage frame 52 and the stationary rod 3. The support frame 51 and the linkage frame 52 are made of high-hardness non-magnetic insulating material. The stationary rod 3 and the moving rod 2 are connected to external equipment through terminal blocks. The parts of the stationary rod 3 and the moving rod 2 that are exposed outside the outer shell 1 are covered with an insulating coating.

[0040] To facilitate locking the moving rod 2 and the stationary rod 3 together during closing, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 and Figure 3The fastening assembly 54 includes a fastening groove on the support frame 51 and a fastening claw 541 slidably disposed on the linkage frame 52. When the moving rod 2 moves to the moment of contact with the stationary rod 3 to close the circuit, the moving rod 2 drives the fastening groove on the support frame 51 to move to the position of the fastening claw 541, so that the upper end of the fastening claw 541 is inserted into the fastening groove, thereby locking the linkage frame 52 and the support frame 51 together, and then locking the moving rod 2 and the stationary rod 3 together.

[0041] To ensure that the latch 541 can automatically insert into the latch 541 when the latch groove on the support frame 51 moves to correspond to the position of the latch 541, the present invention has designed the following structure: (See reference) Figure 2 and Figure 3 The upper edge of the latch 541 has a sloping structure. A return spring is provided between the latch 541 and the linkage frame 52. The support frame 51 moves down to contact the sloping surface of the latch 541, thereby pushing the latch 541 to move and compressing the return spring.

[0042] When the circuit breaker is open, the support frame 51 moves away from the latch 541. At this time, the reset spring pushes the latch 541 against the linkage frame 52 through its elastic force. When the circuit breaker is closed, the support frame 51 moves down. When the lower side of the support frame 51 contacts the inclined surface of the latch 541, the support frame 51 pushes the latch 541 away from the linkage frame 52 and compresses the reset spring to store energy. Therefore, when the latch slot on the support frame 51 moves to the position of the latch 541, the reset spring pushes the latch 541 to reset through its elastic force, so that the latch 541 automatically inserts into the latch slot.

[0043] In order to separate the support frame 51 from the linkage frame 52 during circuit breaking, the present invention designs the following structure: (Continue to read) Figure 2 and Figure 3 A connecting plate 542 is fixedly installed on the lower side of the latch 541, and an electric cylinder 543 is fixedly installed on the linkage frame 52 for pushing the connecting plate 542 and compressing the reset spring. When the circuit is opened, the telescopic section of the electric cylinder 543 extends to push the connecting plate 542, so that the connecting plate 542 drives the latch 541 at the corresponding position away from the linkage frame 52, thereby causing the latch 541 to exit the latch slot and unlocking the support frame 51 and the linkage frame 52.

[0044] To absorb the contact impact force between the moving rod 2 and the stationary rod 3, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 and Figure 3 The energy-absorbing component 55 includes a buffer spring disposed between the lower part of the movable seat 53 and the linkage frame 52. Initially, the buffer spring is in a pre-compressed state. At this time, the upper side of the linkage frame 52 abuts against the bracket 4, and the contact of the stationary rod 3 is located in the middle of the outer shell 1. When the linkage frame 52 is impacted by the moving rod 2 and moves downward, the linkage frame 52 compresses the buffer spring, and the impact force of the moving rod 2 is gradually absorbed through the compression of the buffer spring.

[0045] It should be noted that the buffer spring and the return spring in this embodiment were selected and matched through repeated tests by those skilled in the art, and can adapt to high-intensity repeated compression and recovery. At the same time, the elasticity of the return spring was also repeatedly tested by those skilled in the art, and can ensure effective absorption of the closing impact force of the moving rod 2.

[0046] To prevent the buffer spring from compressing and completely absorbing the impact force of the moving rod 2, and then directly pushing the linkage frame 52 upward, causing the moving rod 2 and stationary rod 3 to repeatedly bounce within the outer casing 1, resulting in unstable closing, the present invention designs the following structure: (Continue reading) Figure 1 , Figure 2 and Figure 3 The energy absorption assembly 55 also includes several electromagnets 551 fixedly mounted on the movable base 53, and neodymium magnets 552 corresponding to the electromagnets 551 are fixedly mounted on the lower side of the support frame 51.

[0047] Before closing the circuit, electromagnet 551 is not energized, so it has no magnetic force. When closing the circuit, electromagnet 551 is energized, so that the magnetic properties of the upward side of electromagnet 551 and the downward side of neodymium magnet 552 are opposite, thus causing electromagnet 551 to attract neodymium magnet 552 downward.

[0048] Therefore, when the linkage frame 52 moves down and compresses the buffer spring to absorb kinetic energy, the support frame 51 drives the neodymium magnet 552 to approach the electromagnet 551, so that the electromagnet 551 attracts the support frame 51 downward, preventing the buffer spring from directly pushing the linkage frame 52 upward through its stored elastic force.

[0049] It should be noted that, through repeated experiments by those skilled in the art, the current carrying capacity and magnetic force of the electromagnet 551 were determined so that the magnetic force could overcome the elastic force of the buffer spring and attract the support frame 51 to move continuously downward when the circuit is closed, so that the buffer spring is compressed to a specified stroke. As the compression stroke increases, the spring potential energy gradually increases, and the magnetic force and elastic force eventually reach a balance. At the same time, in this balanced state, the electromagnet 551 and the neodymium magnet 552 remain in a non-contact state, ensuring the sufficiency and stability of the closing buffer.

[0050] In order to quickly assist the moving rod 2 in moving away from the stationary rod 3 during tripping, the present invention designs the following structure: (See reference) Figure 2 , Figure 3 and Figure 5 The bracket 4 is fixedly equipped with an electric cylinder 553 for driving the moving seat 53 to rise and fall. When the circuit is opened, the current direction of the electromagnet 551 is reversed, so that the electromagnet 551 assists in pushing the support frame 51 upward.

[0051] After the circuit is closed, the electromagnet 551 is kept charged and magnetic, and the telescopic section of the second electric cylinder 553 is extended, so that the second electric cylinder 553 pushes the moving seat 53 upward. The moving seat 53 then drives the linkage frame 52 to move upward through the buffer spring. The linkage frame 52 drives the support frame 51 to move upward synchronously, so that the upper side of the linkage frame 52 abuts against the bracket 4 again. At this time, the contacts of the stationary rod 3 and the moving rod 2 are located in the middle of the outer shell 1. Finally, the power supply to the electromagnet 551 is disconnected.

[0052] When the circuit breaker is tripped, the direction of the current flowing into the electromagnet 551 is reversed, so that the magnetic properties of the upward side of the electromagnet 551 and the downward side of the neodymium magnet 552 are the same. The latch 541 moves quickly, unlocking the support frame 51 and the linkage frame 52. This allows the electromagnet 551 to push the support frame 51 upward quickly through magnetic force. The support frame 51 then drives the moving rod 2 to move away from the stationary rod 3 quickly, ensuring the tripping time.

[0053] It should be noted that the magnitude of the current flowing into the electromagnet 551 in reverse was obtained by those skilled in the art through repeated experiments, taking into account the weight of the moving rod 2 and its other accessories. This method can both achieve rapid assistance in pushing the moving rod 2 away and prevent excessive force from pushing the moving rod 2 away, which could damage the moving rod 2.

[0054] It should be further explained that in the actual engineering application of vacuum circuit breakers, the closing and opening operations are not high-frequency continuous actions, but rather the circuit is kept closed and conductive for a long time under normal grid operation. The corresponding closing or opening operations are only performed when it is necessary to connect or disconnect the line or when a fault protection action occurs. Therefore, although the support frame 51, linkage frame 52, and movable seat 53 added in this invention increase the number of components in the arc-extinguishing chamber structure to a certain extent, these components only play a role in the impact buffering process at the moment of closing and the rapid separation process at the moment of opening. They belong to the instantaneous working mode and will not have any negative impact on the steady-state conduction performance of the circuit breaker in the long-term closed state.

[0055] More importantly, this invention effectively solves the two major problems of closing impact damage and decreasing opening speed caused by the significant increase in the mass of the cup-shaped longitudinal magnetic contact through the functional intervention of the above structure at the two critical moments of closing and opening. It significantly improves the operational reliability and mechanical life of vacuum circuit breakers under heavy contact system conditions. In actual power grid operation, although the operating frequency of circuit breakers is relatively low, every closing or opening operation involves the safety of the power system and is a critical action. Contact bounce during closing may cause arc reignition, and insufficient speed during opening may cause the arc to fail to be extinguished in time. Any unreliability in operation may cause power grid accidents, resulting in significant economic losses or even personal injury.

[0056] This invention achieves high reliability in every critical operation at the cost of moderately increasing structural complexity. Its technical benefits far outweigh the cost of the increased structure, demonstrating clear practical value and promising industrial applications. It aligns with the design principle of "safety first, reliability foremost" in power equipment. Therefore, the technical solution of this invention is not simply a matter of piling up structures, but rather a systematic and functional improvement addressing the two practical pain points of heavy-contact vacuum circuit breakers in terms of closing buffering and opening speed enhancement. It possesses sufficient necessity for implementation and broad application value.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0058] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A circuit breaker arc-extinguishing chamber structure, comprising a housing, wherein a moving rod and a stationary rod for closing and opening are coaxially slidably disposed within the housing, characterized in that, The structure also includes a bracket, on which the outer shell is fixedly connected. The structure also includes an energy-absorbing unit for buffering the impact force of the contact between the moving rod and the stationary rod when closing the circuit. The energy-absorbing unit can also reduce the separation time between the moving rod and the stationary rod when opening the circuit. The energy absorption unit includes a support frame that is insulated and locked to the end of the moving rod, a linkage frame that is insulated and locked to the end of the stationary rod, and a movable seat that is slidably arranged on the upper side of the support. The support frame and the linkage frame are equipped with two sets of fastening components. When the circuit is closed, the support frame and the linkage frame abut against each other simultaneously, and the fastening components automatically lock the support frame and the linkage frame together. The movable base, support frame, and linkage frame are all equipped with energy-absorbing components. The energy-absorbing components absorb the kinetic energy of the moving rod when it is closed by passively moving the stationary rod. When the rod is opened, the energy-absorbing components actively push the moving rod away from the stationary rod quickly.

2. The circuit breaker arc-extinguishing chamber structure according to claim 1, characterized in that, Insulation is provided between the support frame and the moving rod, and between the linkage frame and the stationary rod. The support frame and the linkage frame themselves are made of high-hardness, non-magnetic insulating material.

3. The circuit breaker arc-extinguishing chamber structure according to claim 1, characterized in that, The stationary rod and the moving rod are connected to external equipment via terminal blocks, and the portions of the stationary rod and the moving rod that protrude from the outer side of the housing are covered with an insulating coating.

4. The circuit breaker arc-extinguishing chamber structure according to claim 1, characterized in that, The fastening assembly includes a fastening groove on the support frame and a fastening claw slidably disposed on the linkage frame. When the upper end of the fastening claw is inserted into the fastening groove, the linkage frame and the support frame are locked together.

5. The circuit breaker arc-extinguishing chamber structure according to claim 4, characterized in that, The upper edge of the latch is sloping, and a return spring is provided between the latch and the linkage frame. When the support frame moves down to contact the sloping surface of the latch, it pushes the latch to move and compresses the return spring.

6. The circuit breaker arc-extinguishing chamber structure according to claim 4, characterized in that, A connecting plate is fixedly installed on the lower side of the latch, and an electric cylinder is fixedly installed on the linkage frame to push the connecting plate and compress the reset spring.

7. The circuit breaker arc-extinguishing chamber structure according to claim 1, characterized in that, The energy-absorbing component includes a buffer spring disposed between the lower part of the movable seat and the linkage frame. Initially, the buffer spring is in a pre-compressed state, at which time the upper side of the linkage frame abuts against the bracket, and the contact of the stationary rod is located in the middle of the housing.

8. The arc-extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that, The energy absorption assembly also includes several electromagnets fixedly installed on the movable base, and neodymium magnets corresponding to the electromagnets are fixedly installed on the lower side of the support frame.

9. The circuit breaker arc-extinguishing chamber structure according to claim 8, characterized in that, When the circuit is closed, the magnetism on the upward side of the electromagnet and the magnetism on the downward side of the neodymium magnet are opposite, causing the buffer spring to compress and absorb kinetic energy, and the electromagnet to attract the support frame downward.

10. The arc-extinguishing chamber structure of a circuit breaker according to claim 8, characterized in that, The bracket is fixedly equipped with an electric cylinder two for driving the moving seat to rise and fall. When the circuit is opened, the direction of the electromagnet current is reversed, so that the electromagnet assists in pushing the support frame upward.

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