Vacuum arc-extinguishing chamber with active arc-extinguishing function and internal flexible connection function

Abstract

The invention discloses a vacuum arc-extinguishing chamber with active arc extinguishing and internal flexible connection, which comprises a protective shell and an active arc extinguishing module, a static contact is arranged at the bottom of the protective shell, a moving contact driving shaft is arranged on the top of the protective shell in a drawing manner, a moving contact moving end is arranged at the bottom end of the moving contact driving shaft, and the active arc extinguishing module is arranged at the bottom end of the moving contact driving shaft. The invention relates to the technical field of vacuum arc extinguish chambers. According to the vacuum arc extinguishing chamber with the active arc extinguishing function and the internal flexible connection function, by integrating an active arc extinguishing system and an internal flexible connection structure, the reliability and the strong breaking capacity of a device are improved, composite magnetic field regulation and control are combined with an artificial zero-crossing technology, and the breakthrough of the active arc extinguishing technology is achieved; the problem of breaking of a traditional vacuum arc-extinguishing chamber in direct-current and high-frequency alternating-current scenes is avoided, meanwhile, microsecond-level synchronous linkage is achieved through magnetic field adjustment, manual zero-crossing and an operating mechanism, intelligent cooperative control is achieved, and controllability of the breaking process is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of vacuum interrupter technology, specifically to a vacuum interrupter with active arc extinguishing and internal flexible connections. Background Technology

[0002] Vacuum interrupters are core components of high-voltage switchgear (such as circuit breakers and load switches). Their core function is to enable circuit switching in a sealed high-vacuum environment and quickly extinguish the arc generated during circuit breaking. They are characterized by high arc extinguishing efficiency, long lifespan, and environmental friendliness with no pollutant emissions. They are widely used in 10kV-550kV medium and high voltage power distribution networks and industrial power supply systems.

[0003] In existing technologies, the connection between the moving conductive rod and the internal conductive components in traditional vacuum interrupters is mostly a rigid structure. During frequent opening and closing operations, the axial movement of the moving conductive rod is prone to mechanical stress, leading to fatigue cracking at the connection or failure of the vacuum seal. At the same time, conventional vacuum interrupters rely on the natural zero-crossing of the current to extinguish the arc, which limits the breaking capacity in DC or high-frequency AC scenarios and reduces the service life of the device. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a vacuum interrupter with active arc extinguishing and internal soft connections, which solves the problem that traditional vacuum interrupters rely on natural current zero-crossing for arc extinguishing, resulting in limited breaking capacity in DC or high-frequency AC scenarios.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a vacuum interrupter with active arc extinguishing and internal soft connection, comprising a protective shell and an active arc extinguishing module, wherein a stationary contact is provided on the bottom of the protective shell, and a moving contact drive shaft is provided on the top of the protective shell, wherein a moving contact moving end is provided at the bottom end of the moving contact drive shaft. The top of the protective housing is provided with a moving contact stationary end. The moving contact stationary end and the moving contact stationary end are electrically connected by a flexible connection. The moving contact stationary end and the stationary contact are respectively connected to the arc-initiating end and the arc-extinguishing channel of the active arc-extinguishing module.

[0006] Furthermore, the stationary end of the moving contact is connected to the arc-initiating end of the active arc-extinguishing module via a moving contact lead, and the stationary contact is connected to the arc-extinguishing channel of the active arc-extinguishing module via a stationary contact.

[0007] Furthermore, the stationary end of the moving contact is provided with a guide port adapted to the driving shaft of the moving contact.

[0008] Furthermore, a bellows is provided between the upper surface of the moving end of the moving contact and the stationary end of the moving contact, and the bellows is movably covered outside the driving shaft of the moving contact.

[0009] Furthermore, the inner cavity of the protective housing is provided with an arc-extinguishing chamber shield located between the moving end of the moving contact and the stationary contact.

[0010] Furthermore, the active arc extinguishing module consists of a detection circuit, a triggering circuit, and a control arc extinguishing circuit. The stationary end of the contact is electrically connected to the detection circuit through the moving contact lead. The detection circuit interacts with the triggering circuit through an electrical connection. The triggering circuit interacts with the control arc extinguishing circuit through an electrical connection. The control arc extinguishing circuit is electrically connected to the stationary contact through the stationary contact.

[0011] Furthermore, the protective shell is made of ceramic material, and the inner cavity of the protective shell is a vacuum.

[0012] Furthermore, the flexible connection is a multi-layered flexible metal sheet stacked together, with a wavy cross-section.

[0013] Furthermore, the arc-extinguishing chamber shield is made of a high-permeability alloy material, and its surface is coated with an alumina ceramic coating.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: by integrating an active arc-extinguishing system with an internal flexible connection structure, the reliability and strong breaking capacity of the device are improved; by combining composite magnetic field regulation with artificial zero-crossing technology, a breakthrough in active arc-extinguishing technology is achieved, avoiding the breaking difficulties of traditional vacuum arc-extinguishing chambers in DC and high-frequency AC scenarios; at the same time, magnetic field regulation, artificial zero-crossing and operating mechanism achieve microsecond-level synchronous linkage, realizing intelligent collaborative control, which significantly improves the controllability of the breaking process; in addition, the optimization of contact materials and active management of arc energy greatly extend the electrical life; finally, the environmental adaptability is significantly enhanced, making it suitable for power systems under extreme climatic conditions. Attached Figure Description

[0015] Figure 1 This is a front cross-sectional view of the present invention; Figure 2 This is a structural block diagram of the active arc extinguishing module in this invention.

[0016] In the diagram: 1. Stationary contact; 2. Arc-extinguishing chamber shield; 3. Moving contact moving end; 4. Flexible connection; 5. Bellows; 6. Moving contact drive shaft; 7. Protective housing; 8. Moving contact stationary end; 9. Stationary contact lead wire; 10. Moving contact lead wire; 11. Active arc-extinguishing module. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 and Figure 2 The present invention provides a technical solution: a vacuum arc-extinguishing chamber with active arc extinguishing and internal soft connection, including a protective shell 7 and an active arc-extinguishing module 11. A stationary contact 1 is provided on the bottom of the protective shell 7, and a moving contact drive shaft 6 is pulled out on the top of the protective shell 7. A moving contact moving end 3 is provided at the bottom end of the moving contact drive shaft 6.

[0019] The top of the protective housing 7 is provided with a moving contact stationary end 8. The moving contact moving end 3 and the moving contact stationary end 8 are electrically connected through a flexible connection 4. The moving contact stationary end 8 and the stationary contact 1 are respectively connected to the arc-initiating end and the arc-extinguishing channel of the active arc-extinguishing module 11.

[0020] The vacuum environment inside the protective housing 7 enables the circuit to be switched on and off, and the moving contact drive shaft 6 drives the moving end 3 of the moving contact and the stationary end 8 of the moving contact to open and close the circuit.

[0021] When the circuit breaker is opened, an electric arc is generated between the stationary contact 1 and the moving end 3 of the moving contact. The active arc extinguishing module 11 captures the arc signal through the arc ignition end and forces the current to cross zero through the arc extinguishing channel to extinguish the arc.

[0022] The active arc extinguishing module 11 consists of a detection circuit 12, a triggering circuit 13, and a control arc extinguishing circuit 14. The stationary contact 8 is electrically connected to the detection circuit 12 through the moving contact lead 10. The detection circuit 12 interacts with the triggering circuit 13 through the electrical connection.

[0023] The trigger circuit 13 interacts with the arc-extinguishing control circuit 14 via electrical connection, and the arc-extinguishing control circuit 14 is electrically connected to the stationary contact 1 via the stationary contact 9.

[0024] The stationary end 8 of the moving contact is connected to the arc-starting end of the active arc-extinguishing module 11 through the moving contact lead 10, and the stationary contact 1 is connected to the arc-extinguishing channel of the active arc-extinguishing module 11 through the stationary contact 9.

[0025] The stationary end 8 of the moving contact transmits the arc signal to the detection circuit 12 of the active arc extinguishing module 11 through the moving contact lead 10. After receiving the signal, the trigger circuit 13 starts the control arc extinguishing circuit 14 and injects compensation current in reverse to the stationary contact 1 through the stationary contact lead 9, forcing the current to cross zero and solving the problem of interruption in DC and high-frequency scenarios.

[0026] The detection circuit 12 and the triggering circuit 13: The detection circuit 12 is responsible for real-time monitoring of the arc signal or other relevant electrical parameters in the circuit. When an arc characteristic that meets preset conditions is detected, the detection circuit 12 transmits this signal to the triggering circuit 13 as the basis for triggering the action. It can be said that the detection circuit 12 is the "sensory organ" of the triggering circuit 13, providing it with accurate triggering timing information.

[0027] Triggering circuit 13 and arc extinguishing control circuit 14: After receiving the signal from the detection circuit 12, the triggering circuit 13 processes and judges the signal. When the triggering condition is met, it generates a trigger signal and transmits it to the arc extinguishing control circuit 14. This trigger signal acts like a "switch command," used to start the arc extinguishing control circuit 14 and enable it to perform the arc extinguishing operation.

[0028] The detection circuit 12 and the arc-extinguishing control circuit 14: The detection circuit 12 indirectly provides the basis for determining the start-up of the arc-extinguishing control circuit 14. Through the monitoring and signal transmission of the circuit state by the detection circuit 12, the triggering circuit 13 then triggers the arc-extinguishing control circuit 14 to operate. The three form a complete control chain, ensuring that the arc-extinguishing operation can be started in a timely and accurate manner when an arc is detected, thus guaranteeing the safe operation of the circuit.

[0029] The detection circuit 12 monitors the arc voltage and current in real time, and the triggering circuit 13 responds within 10μs and drives the arc extinguishing circuit 14. The arc path is regulated by a composite magnetic field, and the arc burning time is compressed to less than 2ms by combining artificial zero-crossing technology, thus achieving microsecond-level synchronous control.

[0030] The stationary end 8 of the moving contact is provided with a guide opening that is adapted to the driving shaft 6 of the moving contact. The guide opening of the stationary end 8 of the moving contact is precisely matched with the driving shaft 6 of the moving contact to ensure that the moving end 3 of the moving contact moves vertically during the opening and closing process, avoiding displacement that could lead to contact erosion or excessive deformation of the soft connection 4, and improving mechanical reliability.

[0031] A bellows 5 is provided between the upper surface of the moving end 3 of the moving contact and the stationary end 8 of the moving contact, and the bellows 5 is movably covered outside the driving shaft 6 of the moving contact.

[0032] The bellows 5 is sleeved outside the moving contact drive shaft 6. One end is fixed to the stationary end 8 of the moving contact, and the other end extends and retracts with the moving end 3 of the moving contact. While maintaining the vacuum environment of the protective shell 7, it compensates for the displacement difference caused by axial movement and prevents air leakage.

[0033] The inner cavity of the protective housing 7 is provided with an arc-extinguishing chamber shield 2 located between the moving end 3 of the moving contact and the stationary contact 1. The arc-extinguishing chamber shield 2 absorbs the electromagnetic interference and thermal radiation generated by the electric arc, prevents the contact material from oxidizing, and extends the contact life to more than 30,000 times.

[0034] The protective shell 7 is made of ceramic material, and its inner cavity is a vacuum. The ceramic protective shell 7 achieves hermetic sealing through a high-temperature sintering process, with an inner cavity vacuum degree ≤10. -4 Pa suppresses the diffusion of electric arc plasma, and in conjunction with the stress buffer of the soft connection 4, ensures stable sealing performance under extreme temperatures of -40℃ to +85℃.

[0035] The flexible connection 4 is made of multiple layers of flexible metal sheets with a wavy cross section. The flexible connection 4 absorbs the mechanical stress of the axial movement of the moving contact and prevents the vacuum seal from failing. The flexible connection 4 uses multiple layers of 0.1mm thick copper foil. The wavy cross section increases the flexible deformation space, which increases the mechanical stress dispersion coefficient by 2.3 times and the fatigue life reaches 30,000 times, which is 200% higher than the traditional rigid connection.

[0036] The arc-extinguishing chamber shield 2 is made of a high-permeability alloy material and is coated with an alumina ceramic coating. The alumina ceramic coating (thickness 0.5mm) has a thermal conductivity of only 15W / (m·K), which is 80% lower than that of the alloy substrate. It forms a thermal barrier under the high temperature of the electric arc (≥10000K), which controls the temperature rise of the contact to ≤150K, meeting the requirements of high-frequency interruption.

[0037] During operation, the device achieves circuit switching through the contact and separation of the stationary contact 1 and the moving end 3 of the moving contact with the stationary end 8 of the moving contact. The up-and-down movement of the moving contact drive shaft 6 drives the moving end 3 of the moving contact to contact or separate from the stationary end 8 of the moving contact, thereby controlling the opening and closing of the circuit. The active arc extinguishing module 11 is the core component, consisting of a detection circuit 12, a triggering circuit 13, and a control arc extinguishing circuit 14. When the circuit needs to be disconnected, the detection circuit 12 detects a change in the electrical signal, and the triggering circuit 13 is activated, thereby controlling the arc extinguishing circuit 14 to generate an active arc extinguishing action. The active arc extinguishing technology combines composite magnetic field regulation and artificial zero-crossing technology, and achieves rapid arc extinguishing by actively regulating the arc shape through the magnetic field, breaking through the dependence of traditional vacuum arc extinguishing chambers. In the passive mode of arc extinguishing by natural zero-crossing of current, the moving end 3 and the stationary end 8 of the moving contact are electrically connected by a flexible connection 4. The flexible connection is made of multiple layers of flexible metal sheets with a wavy cross-section. This design effectively alleviates the mechanical stress generated during opening and closing operations and improves the fatigue life of the connection parts. The arc-extinguishing chamber shield 2 is set between the moving end 3 and the stationary contact 1. It is made of high magnetic permeability alloy material and coated with an alumina ceramic coating, which helps to absorb and disperse arc energy, protect the contact from arc erosion, and extend the service life of the contact. The bellows 5 is movablely set outside the moving contact drive shaft 6, which plays a sealing and buffering role, preventing external gas from entering the arc-extinguishing chamber, while adapting to the movement of the moving contact drive shaft and maintaining the vacuum environment inside the arc-extinguishing chamber.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vacuum arc-extinguishing chamber with active arc extinguishing and internal flexible connections, comprising a protective outer shell (7) and an active arc-extinguishing module (11), characterized in that: A stationary contact (1) is provided on the bottom of the protective shell (7), and a moving contact drive shaft (6) is provided on the top of the protective shell (7). A moving contact moving end (3) is provided at the bottom of the moving contact drive shaft (6). The protective housing (7) is provided with a moving contact stationary end (8) on the top. The moving contact moving end (3) and the moving contact stationary end (8) are electrically connected through a soft connection (4). The moving contact stationary end (8) and the stationary contact (1) are respectively connected to the arc-starting end and arc-extinguishing channel of the active arc-extinguishing module (11).

2. A vacuum interrupter with active arc extinguishing and internal flexible connections according to claim 1, characterized in that: The stationary end (8) of the moving contact is connected to the arc-starting end of the active arc-extinguishing module (11) through the moving contact lead (10), and the stationary contact (1) is connected to the arc-extinguishing channel of the active arc-extinguishing module (11) through the stationary contact (9).

3. A vacuum interrupter with active arc extinguishing and internal flexible connections according to claim 1, characterized in that: The stationary end (8) of the moving contact is provided with a guide port that is adapted to the driving shaft (6) of the moving contact.

4. A vacuum interrupter with active arc extinguishing and internal flexible connections according to claim 1, characterized in that: A bellows (5) is provided between the upper surface of the moving end (3) of the moving contact and the stationary end (8) of the moving contact, and the bellows (5) is movably covered outside the driving shaft (6) of the moving contact.

5. A vacuum interrupter with active arc extinguishing and internal flexible connections according to claim 1, characterized in that: The inner cavity of the protective housing (7) is provided with an arc-extinguishing chamber shield (2) located between the moving end (3) of the moving contact and the stationary contact (1).

6. A vacuum interrupter with active arc extinguishing and internal flexible connections according to claim 2, characterized in that: The active arc extinguishing module (11) consists of a detection circuit (12), a triggering circuit (13), and a control arc extinguishing circuit (14). The stationary end (8) of the contact is electrically connected to the detection circuit (12) through the moving contact lead (10). The detection circuit (12) interacts with the triggering circuit (13) through an electrical connection. The triggering circuit (13) interacts with the control arc extinguishing circuit (14) through an electrical connection. The control arc extinguishing circuit (14) is electrically connected to the stationary contact (1) through the stationary contact (9).

7. A vacuum interrupter with active arc extinguishing and internal flexible connections according to claim 1, characterized in that: The protective shell (7) is made of ceramic material, and the inner cavity of the protective shell (7) is a vacuum.

8. A vacuum interrupter with active arc extinguishing and internal flexible connections according to claim 1, characterized in that: The soft connection (4) is a multi-layer flexible metal sheet stacked together, and its cross-section is wavy.

9. A vacuum interrupter with active arc extinguishing and internal flexible connections according to claim 5, characterized in that: The arc-extinguishing chamber shield (2) is made of a high magnetic permeability alloy and is coated with an alumina ceramic coating.

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