Arc extinguish chamber structure of vacuum circuit breaker

Abstract

The utility model provides an arc extinguish chamber structure of a vacuum circuit breaker, which comprises a ceramic shell, the side edge of the ceramic shell is provided with a support insulating frame and is connected with a mounting bracket, and the bracket is provided with a contact and an adjusting mechanism. In the contact mechanism, a static contact at the end part of a contact seat is contacted with a moving contact, the moving contact is matched with a contact spring through a contact rod, and a spring sleeve is arranged at the upper end of the spring. And the mounting bracket is provided with a wiring terminal and an isolation plate. An adjusting rod of the adjusting mechanism slides in a key groove hole, an end adjusting ring can control the adjusting rod to move, and the adjusting rod is linked with a crank arm to adjust contact parameters. In addition, a conductive rod on the side of the spring sleeve and a lower-end bus connecting sheet form a conductive path, and a grounding bolt on the side of the ceramic shell guarantees grounding safety. The arc extinguish chamber utilizes a vacuum environment to extinguish arcs efficiently, contact parameters can be adjusted flexibly, different power system requirements can be met, the performance, stability and reliability of the circuit breaker are improved, and the arc extinguish chamber has a good application prospect.

Description

Technical Field

[0001] The utility model relates to the field of arc extinguishing chambers of circuit breakers, and more specifically, to an arc extinguishing chamber structure of a vacuum circuit breaker. Background Art

[0002] As a crucial control and protection device in the power system, the performance of the arc extinguishing chamber of a vacuum circuit breaker directly affects the safe and stable operation of the entire power system. In recent years, with the continuous development and upgrading of the power system, the performance requirements for the arc extinguishing chamber of vacuum circuit breakers have been increasing. However, the existing arc extinguishing chamber structures of vacuum circuit breakers have many deficiencies and are difficult to meet the diverse needs of the current power system.

[0003] In terms of contact between the contacts, in the existing arc extinguishing chamber structures, the pre-tightening force design of the contact springs is not reasonable enough to ensure that the moving and static contacts always maintain close contact. This results in a large contact resistance, serious heating of the contacts during normal operation, which not only reduces the electrical conductivity, increases power consumption, but also accelerates the wear of the contacts, shortens the service life of the contacts, requires frequent replacement of the contacts, increases the maintenance cost and power outage time.

[0004] In terms of the conductive path, the connection method and material selection of the conductive rod and the busbar connection piece in some existing arc extinguishing chambers are not good enough to form a low-resistance conductive path. This causes large resistance losses during the current transmission process, reduces the efficiency and stability of power transmission, and affects the overall performance of the power system.

[0005] In terms of parameter adjustment, most of the existing arc extinguishing chambers do not have a flexible adjustment function. The key parameters such as the opening distance and overtravel of the contacts are fixed at the time of factory and cannot be adjusted according to the operating requirements and actual working conditions of different power systems. When the operating conditions of the power system change or the contacts are worn, it is impossible to compensate for the influence by adjusting the parameters, resulting in a gradual decline in the performance of the arc extinguishing chamber and being difficult to adapt to the complex and changeable power grid environment. Moreover, once the contact parameters deviate, it is often necessary to carry out large-scale disassembly and adjustment of the entire arc extinguishing chamber, and the maintenance and debugging processes are complex and time-consuming, increasing the maintenance cost and difficulty.

[0006] In terms of mechanical stability and insulation safety, the existing arc extinguishing chamber structures have defects in support and insulation design. Some arc extinguishing chambers lack a stable support structure and are difficult to withstand the external force impacts and vibrations in the outdoor complex environment, easily causing internal components to loosen or be damaged, affecting the normal operation of the arc extinguishing chamber. At the same time, the selection and use of insulation materials are not reasonable enough to effectively isolate the live parts from the external environment, increasing the risk of electric shock and leakage accidents and threatening the safety of equipment and personnel.

[0007] In terms of grounding protection, some existing arc extinguishers do not have a reliable grounding device or the grounding method is unreasonable. When an insulation breakdown fault occurs inside the arc extinguisher, the fault current cannot be quickly introduced into the ground, which is likely to cause equipment damage and personal injury. At the same time, it will also generate significant electromagnetic interference, affecting the stability and reliability of the power system.

[0008] In terms of installation and maintenance, most of the existing arc extinguisher structures adopt an integral design, with a strong correlation between components, making it difficult to perform modular assembly and debugging. This results in a cumbersome installation process, low installation efficiency, and when a fault occurs in the equipment, it is difficult to quickly locate and replace the damaged components, increasing the maintenance time and cost, and having a greater impact on power supply. Therefore, we have made improvements in this regard and proposed an arc extinguisher structure for a vacuum circuit breaker. Summary of the Utility Model

[0009] The purpose of the present utility model is to address the problems presented in the current background technology. To achieve the above-mentioned utility model purpose, the present utility model provides the following technical solutions: An arc extinguisher structure for a vacuum circuit breaker, including a ceramic outer shell, a support insulating frame is provided on the side of the ceramic outer shell, the support insulating frame is connected to an installation bracket, a contact mechanism is provided on the installation bracket, and the contact mechanism is connected to an adjustment mechanism.

[0010] As a preferred technical solution of the present utility model, the contact mechanism is provided with a contact seat, a static contact is provided at the end of the contact seat, and the static contact is in contact with a moving contact.

[0011] As a preferred technical solution of the present utility model, the moving contact is matched with a contact spring through a contact rod, and a spring sleeve is provided at the upper end of the contact spring.

[0012] As a preferred technical solution of the present utility model, a wiring terminal is provided on the installation bracket, and an isolation plate is provided at the center of the installation bracket.

[0013] As a preferred technical solution of the present utility model, the adjustment mechanism is provided with an adjustment rod, the adjustment rod is slidably arranged in an adjustment key slot hole, and an adjustment ring is provided at the end of the adjustment rod.

[0014] As a preferred technical solution of the present utility model, the adjustment rod is linked with a crank arm.

[0015] As a preferred technical solution of the present utility model, a conductive rod is provided on the side of the spring sleeve, and a bus bar connecting piece is provided at the lower end of the conductive rod.

[0016] As a preferred technical solution of the present utility model, a grounding bolt is provided on the side of the ceramic outer shell.

[0017] Compared with the prior art, the beneficial effects of the present utility model are as follows: Under high-vacuum conditions, the metal vapor in the arc rapidly diffuses and condenses, causing the arc to quickly lose its conductive medium and extinguish, effectively shortening the arcing time, improving the arc extinguishing efficiency, ensuring that the power system can quickly cut off the circuit during a fault, and reducing damage to equipment and the power grid. The isolation plate at the center of the mounting bracket can confine the arc within a certain area, preventing it from spreading to the surroundings, and further enhancing the reliability and stability of arc extinguishing.

[0018] The pre-tightening force of the contact spring of the present utility model ensures the close contact between the moving and static contacts, reduces the contact resistance, decreases the heating phenomenon of the contacts during normal operation, improves the electrical conductivity, reduces the power loss, and extends the service life of the contacts.

[0019] The conductive rod and the busbar connection piece form a low-resistance conductive path, ensuring smooth current transmission, and improving the efficiency and stability of power transmission.

[0020] The structure of the adjusting mechanism of the present utility model enables the operator to drive the adjusting rod to slide in the adjusting keyway hole by rotating the adjusting ring, and then precisely adjust the key parameters of the opening distance and overtravel of the contacts through the linkage of the crank arm. This feature enables the arc extinguishing chamber to be flexibly adjusted according to the operating requirements and actual working conditions of different power systems, and adapt to various complex power grid environments. The adjustability helps to compensate for the influence of wear when the contacts are worn during long-term use by adjusting the parameters, maintain the stable performance of the arc extinguishing chamber, and extend its overall service life.

[0021] The existence of the adjusting mechanism of the present utility model makes the maintenance and debugging of the arc extinguishing chamber more convenient. Maintenance personnel can quickly adjust the contact parameters according to the actual detection results without large-scale disassembly and replacement of the entire arc extinguishing chamber, reducing the maintenance cost and time.

[0022] When the power system undergoes technological upgrades or transformations, the performance parameters of the arc extinguishing chamber can be conveniently readjusted and optimized to better adapt to the new power grid requirements, improving the expandability and compatibility of the equipment.

[0023] The support insulating frame on the side of the ceramic shell of the present utility model is connected to the mounting bracket, providing a stable support structure for the entire arc extinguishing chamber, enhancing the mechanical stability of the equipment, capable of withstanding certain external force impacts and vibrations, and adapting to complex outdoor installation environments.

[0024] Both the support insulating frame and the ceramic shell are made of materials with good insulation performance, effectively isolating the live part from the external environment, improving the insulation safety of the equipment, and reducing the risk of electric shock and leakage accidents.

[0025] The grounding bolt provided on the side of the ceramic housing of the present utility model can reliably ground the arc-extinguishing chamber housing. When an insulation breakdown fault occurs inside the arc-extinguishing chamber, the grounding bolt can quickly introduce the fault current into the ground, ensuring the safety of equipment and personnel, while reducing electromagnetic interference and improving the stability and reliability of equipment operation.

[0026] Each component of the contact mechanism and the adjustment mechanism of the present utility model adopts a modular structure. During the installation process, they can be assembled and debugged separately, and then installed as a whole, improving the installation efficiency and reducing the installation difficulty. The modular structure also facilitates quick positioning and replacement of damaged components when the equipment fails, shortening the maintenance time and reducing the impact on power supply. Brief Description of the Drawings

[0027] Figure 1 is a schematic structural diagram provided by the present utility model;

[0028] Figure 2 is a schematic structural diagram of another perspective provided by the present utility model;

[0029] Figure 3 is a schematic partial structural diagram provided by the present utility model;

[0030] Figure 4 is a schematic front view structural diagram provided by the present utility model.

[0031] Labels in the figure:

[0032] 1, ceramic housing; 2, support insulating frame; 3, mounting bracket; 4, contact seat; 5, static contact; 6, moving contact; 7, contact spring; 71, spring sleeve; 8, contact rod; 9, terminal; 10, partition board; 11, adjusting rod; 12, adjusting keyway hole; 13, adjusting ring; 14, crank arm; 15, conducting rod; 16, bus connection piece; 17, grounding bolt. Detailed Description of the Preferred Embodiment

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present utility model.

[0034] Therefore, the following detailed description of the embodiments of the present utility model is not intended to limit the scope of the present utility model claimed, but merely represents some embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments may be combined with each other. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] Embodiment 1: An arc extinguishing chamber structure of a vacuum circuit breaker, including a ceramic housing 1, a support insulating frame 2 is arranged on the side of the ceramic housing 1, the support insulating frame 2 is connected to a mounting bracket 3, a contact mechanism is arranged on the mounting bracket 3, and the contact mechanism is connected to an adjusting mechanism.

[0036] The contact mechanism is provided with a contact seat 4, a static contact 5 is arranged at the end of the contact seat 4, and the static contact 5 is in contact with a moving contact 6. The moving contact 6 is matched with a contact spring 7 through a contact rod 8, and a spring sleeve 71 is arranged at the upper end of the contact spring 7. A wiring terminal 9 is arranged on the mounting bracket 3, and an isolation plate 10 is arranged at the center of the mounting bracket 3.

[0037] The adjusting mechanism is provided with an adjusting rod 11, the adjusting rod 11 is slidably arranged in an adjusting keyway hole 12, and an adjusting ring 13 is arranged at the end of the adjusting rod 11. The adjusting rod 11 is linked and connected with a toggle arm 14. A conductive rod 15 is arranged on the side of the spring sleeve 71, and a bus bar connecting piece 16 is arranged at the lower end of the conductive rod 15. A grounding bolt 17 is arranged on the side of the ceramic housing 1.

[0038] Working principle of the adjustable pole-mounted vacuum circuit breaker arc extinguishing chamber structure: The adjustable pole-mounted vacuum circuit breaker arc extinguishing chamber is mainly used to cut off and connect circuits in the power system. When a short-circuit fault occurs in the circuit, it can quickly extinguish the arc to ensure the safe and stable operation of the power system. Its working process involves multiple links such as the opening and closing of contacts, arc extinguishing, and parameter adjustment.

[0039] Closing state: When the circuit breaker is in the closing state, the moving contact 6 in the contact mechanism is in close contact with the static contact 5. The moving contact 6 is installed on the contact rod 8, and the contact rod 8 is matched with the contact spring 7. The contact spring 7 is compressed to generate a certain pre-tightening force to ensure good electrical contact between the moving contact 6 and the static contact 5, reduce the contact resistance, reduce the heating of the contacts during normal operation, and ensure the conduction performance of the circuit. The spring sleeve 71 is located at the upper end of the contact spring 7 and plays a role in fixing and guiding the telescopic movement of the contact spring 7.

[0040] Open circuit state: When the circuit needs to be cut off, an external control signal triggers the relevant operating mechanism, causing the moving contact 6 to separate from the static contact 5. The contact spring 7 gradually releases energy during the separation of the moving contact 6, providing a certain boost for the rapid separation of the moving contact 6, accelerating the contact separation speed, and reducing the arcing time.

[0041] Arc extinguishing principle: The arc extinguishing chamber uses a ceramic shell 1 to create a vacuum environment inside. When the moving contact 6 separates from the static contact 5, an arc will be generated between the contacts. Due to the excellent insulation performance and arc extinguishing ability of the vacuum, the arc quickly extinguishes in the vacuum. At the moment of contact separation, the metal vapor between the contacts will quickly diffuse and condense in the high-vacuum environment, causing the arc to lose the medium for maintaining conduction, thus achieving rapid arc extinguishing.

[0042] Structural auxiliary arc extinguishing: The partition plate 10 set at the center of the mounting bracket 3 can prevent the arc from spreading around, restricting the arc within a certain range, which helps to improve the arc extinguishing efficiency. At the same time, the ceramic shell 1 itself has good insulation performance and can withstand a relatively high voltage, ensuring the electrical insulation safety of the arc extinguishing chamber during the arc extinguishing process.

[0043] Operating principle of the adjusting mechanism: The adjusting mechanism is used to adjust some key parameters of the circuit breaker, such as the opening distance and overtravel of the contacts. The adjusting rod 11 is slidably arranged in the adjusting keyway hole 12, and an adjusting ring 13 is provided at the end. The operator can rotate the adjusting ring 13 to make the adjusting rod 11 slide in the adjusting keyway hole 12.

[0044] The adjusting rod 11 is linked to the toggle arm 14. When the adjusting rod 11 moves, it will drive the toggle arm 14 to act. The action of the toggle arm 14 will further affect the movement of the contact mechanism, thereby achieving precise adjustment of the contact opening distance and overtravel parameters to meet the operating requirements of different power systems.

[0045] Conduction and connection principle: The conducting rod 15 set on the side of the spring sleeve 71 plays a role in conducting current. In the closed state, the current flows in from the terminal 9, passes through the static contact 5, moving contact 6, contact rod 8, contact spring 7, spring sleeve 71 of the contact mechanism, and is then conducted to the bus connection piece 16 through the conducting rod 15, and finally connected to the bus of the power system.

[0046] The grounding bolt 17 set on the side of the ceramic shell 1 is used to reliably ground the outer shell of the arc extinguishing chamber. When a fault occurs inside the arc extinguishing chamber, such as insulation breakdown, the grounding bolt 17 can introduce the fault current into the ground to ensure the safety of the equipment and personnel. At the same time, grounding also helps to reduce electromagnetic interference and improve the operating stability of the equipment.

[0047] The arc extinguishing chamber of the adjustable pole-mounted vacuum circuit breaker realizes the disconnection and connection of the circuit through the opening and closing of the contact mechanism, uses the vacuum environment to achieve rapid arc extinguishing, adjusts the key parameters through the adjustment mechanism, and at the same time ensures good electrical conductivity and grounding protection, ensuring the safe and reliable operation of the power system.

[0048] Embodiment 2: The arc extinguishing chamber structure of a vacuum circuit breaker. In the distribution network in the suburbs of a certain city, due to the large fluctuations in the electricity load in this area and the frequent influence of bad weather such as thunderstorms and strong winds, higher requirements are put forward for the performance and reliability of the pole-mounted vacuum circuit breaker. In order to ensure the stability and safety of power supply, the arc extinguishing chamber structure of this adjustable pole-mounted vacuum circuit breaker is adopted.

[0049] Component assembly and installation: Select a ceramic shell 1 of appropriate specifications, which has good insulation performance and mechanical strength and can withstand a certain internal pressure and the influence of the external environment.

[0050] Install the support insulating frame 2 on the side of the ceramic shell 1, and use high-strength insulating glue to firmly paste the support insulating frame 2 on the ceramic shell 1 to ensure a tight connection and good insulation performance.

[0051] Connect the ceramic shell 1 with the support insulating frame 2 installed to the installation bracket 3. Fix the support insulating frame 2 and the installation bracket 3 together with bolts to ensure the stability and verticality of the installation bracket 3 and provide a reliable basis for the installation of subsequent components.

[0052] Contact mechanism installation: Install the contact seat 4 on the installation bracket 3 and fix it with positioning pins and bolts to ensure the accurate position of the contact seat 4. Install the static contact 5 at the end of the contact seat 4 by welding or crimping to ensure good electrical connection between the static contact 5 and the contact seat 4 and the contact resistance meets the structural requirements.

[0053] Installation of the moving contact 6, contact rod 8 and contact spring 7: Install the moving contact 6 at one end of the contact rod 8 to ensure that the contact area and contact pressure between the moving contact 6 and the static contact 5 meet the standards.

[0054] Put the contact spring 7 on the contact rod 8 and install the upper end of the spring in the spring sleeve 71. The spring sleeve 71 plays a role in fixing and guiding the spring to ensure that the spring does not shift during the telescopic process.

[0055] Adjustment mechanism installation: Insert the adjustment rod 11 into the adjustment keyway hole 12 to ensure that the adjustment rod 11 can slide flexibly in the keyway hole. The adjustment keyway hole 12 plays a role in restricting the movement direction of the adjustment rod 11 to ensure the accuracy of adjustment.

[0056] An adjusting ring 13 is installed at the end of the adjusting rod 11. The adjusting ring 13 is provided with anti-slip lines to facilitate the rotation operation of the operator.

[0057] Linkage connection of the crank arm 14: The adjusting rod 11 and the crank arm 14 are connected in a linkage manner. Through a connecting rod or a gear transmission mechanism, the movement of the adjusting rod 11 can be accurately transmitted to the crank arm 14 to achieve the adjustment of the contact mechanism.

[0058] A terminal 9 is installed on the mounting bracket 3. The terminal 9 is made of copper material and has good electrical conductivity. The terminal 9 is fixed on the mounting bracket 3 by bolts and sealed to prevent dust and moisture from entering.

[0059] An insulating plate 10 is installed at the center of the mounting bracket 3. The insulating plate 10 is made of a material with good insulation performance, such as an epoxy resin plate. The insulating plate 10 is fixed on the mounting bracket 3 by glue or bolts to play a role in isolating the arc and preventing phase-to-phase short circuit.

[0060] A conducting rod 15 is installed on the side of the spring sleeve 71. The conducting rod 15 is connected to the spring sleeve 71 by welding or crimping to ensure good electrical connection.

[0061] A bus connection piece 16 is installed at the lower end of the conducting rod 15. The bus connection piece 16 is made of a copper bar and has a large current-carrying capacity. The bus connection piece 16 is fixed to the conducting rod 15 by bolts and surface-treated to improve its antioxidant and corrosion resistance performance.

[0062] A grounding bolt 17 is installed on the side of the ceramic housing 1. The grounding bolt 17 is made of stainless steel material and has good corrosion resistance. The grounding bolt 17 is fixed to the ceramic housing 1 by threaded connection, and the grounding bolt 17 is connected to the grounding grid by a grounding wire to ensure reliable grounding of the arc extinguishing chamber.

[0063] After the installation is completed, check the initial contact position of the moving contact 6 and the static contact 5. Use a feeler gauge to measure the contact pressure and contact area between the contacts to ensure that they meet the structural requirements.

[0064] By rotating the adjusting ring 13, the adjusting rod 11 slides in the adjusting keyway hole 12. The movement of the adjusting rod 11 drives the crank arm 14 to act, thereby changing the position and state of the contact mechanism.

[0065] Adjust the adjusting ring 13 repeatedly, and at the same time use professional measuring instruments to measure and adjust the opening distance and overtravel parameters of the contacts until all parameters reach the optimal values.

[0066] Use an insulation resistance tester to test the insulation resistance of the arc extinguishing chamber. Before the test, ensure that the arc extinguishing chamber is in a power-off state and clean and dry it.

[0067] Connect the test leads of the tester to the terminal 9 and the grounding bolt 17 of the arc extinguishing chamber respectively, and conduct the test according to the operation instructions of the tester. The insulation resistance value should meet the requirements of relevant standards; otherwise, it is necessary to check whether there is damage or moisture in the insulation components.

[0068] Conduct a withstand voltage test on the arc extinguishing chamber. Apply the specified test voltage to the arc extinguishing chamber using a withstand voltage test device for a certain period of time. During the test, closely observe whether there are abnormal phenomena such as discharge and flashover in the arc extinguishing chamber.

[0069] If any abnormality occurs during the test, the test should be stopped immediately, the arc extinguishing chamber should be inspected and processed, and the test should be repeated after troubleshooting until the test is qualified.

[0070] During the operation of the arc extinguishing chamber, use an infrared thermal imager to regularly monitor the temperature of the contact and the terminal 9. If it is found that the temperature rises abnormally, it may be due to poor contact of the contact or a fault in the conductive component, and it should be processed in a timely manner.

[0071] Install on-line monitoring equipment to monitor the voltage, current, power and other electrical parameters of the arc extinguishing chamber in real time. By analyzing the monitoring data, timely detect the abnormal operation of the arc extinguishing chamber and take corresponding measures for processing.

[0072] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above embodiments, the present invention is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention are covered by the scope of the claims of the present invention.

Claims

1. An arc extinguishing chamber structure of a vacuum circuit breaker, comprising a ceramic housing (1), characterized in that, A support insulating frame (2) is provided on the side of the ceramic housing (1). The support insulating frame (2) is connected to the mounting bracket (3). A contact mechanism is provided on the mounting bracket (3), and the contact mechanism is connected to the adjusting mechanism.

2. The arc extinguishing chamber structure of a vacuum circuit breaker according to claim 1, characterized in that, The contact mechanism is provided with a contact seat (4). A static contact (5) is provided at the end of the contact seat (4), and the static contact (5) is in contact with the moving contact (6).

3. The arc extinguishing chamber structure of a vacuum circuit breaker according to claim 2, characterized in that, The moving contact (6) is matched with a contact spring (7) through a contact rod (8). A spring sleeve (71) is provided at the upper end of the contact spring (7).

4. The arc extinguishing chamber structure of a vacuum circuit breaker according to claim 3, characterized in that, A wiring terminal (9) is provided on the mounting bracket (3), and an isolation plate (10) is provided at the center of the mounting bracket (3).

5. The arc extinguishing chamber structure of a vacuum circuit breaker according to claim 1, characterized in that, The adjusting mechanism is provided with an adjusting rod (11). The adjusting rod (11) is slidably arranged in an adjusting keyway hole (12), and an adjusting ring (13) is provided at the end of the adjusting rod (11).

6. The arc extinguishing chamber structure of a vacuum circuit breaker according to claim 5, characterized in that, The adjusting rod (11) is linked with the crank arm (14).

7. The arc extinguishing chamber structure of a vacuum circuit breaker according to claim 3, characterized in that, A conductive rod (15) is provided on the side of the spring sleeve (71), and a bus bar connecting piece (16) is provided at the lower end of the conductive rod (15).

8. The arc extinguishing chamber structure of a vacuum circuit breaker according to claim 1, characterized in that, A grounding bolt (17) is provided on the side of the ceramic housing (1).

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