10kv electrically operated vacuum circuit breaker

Abstract

10kV electric direct control vacuum circuit breaker belongs to the technical field of switch, and particularly relates to a 10kV electric direct control vacuum circuit breaker. The 10kV electric direct control vacuum circuit breaker has simple structure, reliable action and stable operation. The utility model is characterized in that: a bimetallic resistance piece with one end fixed and the other end free is arranged in the box body, the free end of the bimetallic resistance piece is connected with the movable contact rod through connecting wires, the fixed end of the bimetallic resistance piece is connected with the conductive output end through output wires, an insulating triangular plate is further arranged in the box body, the right angle position of the insulating triangular plate is hinged with an insulating pull rod, one right angle side of the insulating triangular plate corresponds to the free end of the bimetallic resistance piece, an insulating transmission rod is hingedly arranged on the other right angle side of the insulating triangular plate, and the end of the insulating transmission rod corresponds to the micro switch of the electric push-pull device.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, specifically relating to a 10kV electrically controlled direct-controlled vacuum circuit breaker. Background Technology

[0002] Currently, the construction of modern smart distribution networks in cities requires more 10kV smart control switches with dedicated functions. However, the existing 10kV electric vacuum circuit breakers are of limited variety and cannot meet the needs of modern power system construction, let alone adapt to the requirements of modern smart distribution network construction, let alone realize the new pattern of smart and modern development of urban distribution networks.

[0003] Furthermore, during our continuous upgrades and modifications to the existing 10kV electric vacuum circuit breakers, we discovered that their internal structure is quite complex, with too many transmission components, making them prone to disengagement or jamming. According to the principles of optimal structural design, the goal is to continuously simplify the internal structure in accordance with scientific and objective laws. Utility Model Content

[0004] This utility model addresses the above-mentioned problems by providing a 10kV electrically controlled vacuum circuit breaker that is simple in structure, reliable in operation, and stable in running.

[0005] This utility model adopts the following technical solution: It includes a housing, inside which is installed a standard vacuum tube with a fixed conductor and a movable contact rod. The input end of the fixed conductor is located outside the housing. An electric push-pull device is installed inside the housing. The telescopic rod of the electric push-pull device is connected to the movable contact rod of the standard vacuum tube via an insulated pull rod. The key feature is that: a bimetallic resistor with one end fixed and the other end free is installed inside the housing. The free end of the bimetallic resistor is connected to the movable contact rod via a connecting wire; the fixed end of the bimetallic resistor is connected to a conductive output end via an output wire; and an insulated three-phase... An insulating triangular plate is hinged to an insulating pull rod at its right-angle position. One right-angle side of the insulating triangular plate corresponds to the free end of the bimetallic resistor. An insulating transmission rod is hinged to the other right-angle side of the insulating triangular plate, and the end of the insulating transmission rod corresponds to the micro switch of the electric push-pull device. The bimetallic resistor is composed of two metal sheets with different coefficients of thermal expansion. When the temperature of the bimetallic resistor rises due to excessive current, the two metal sheets elongate by different lengths, causing the free end of the bimetallic resistor to bend towards the insulating triangular plate, pushing the insulating triangular plate to rotate, and causing the insulating transmission rod to act on the micro switch.

[0006] As a preferred embodiment of this utility model, an insulating isolation plate is provided inside the box, with one side of the insulating isolation plate being a non-electrical operation compartment and the other side being an electric compartment; the electric push-pull device is located inside the non-electrical operation compartment, and the telescopic rod of the electric push-pull device passes through the insulating isolation plate and is connected to the insulating pull rod inside the electric compartment; the micro switch is located inside the electric compartment, and an insulating sleeve is provided outside the insulating transmission rod.

[0007] Furthermore, the insulating rod is provided with a support frame for an insulating triangular plate, the right-angle position of the insulating triangular plate is hinged to the support frame, the bimetallic resistor is provided on the insulating rod, and the insulating rod is also provided with an upper fixing frame; the upper end of the insulating sleeve is connected to the upper fixing frame, and the lower end of the insulating sleeve is connected to the lower fixing frame at the lower end of the insulating rod.

[0008] Furthermore, a return spring is provided between the upper fixed frame and the right-angled side of the insulating triangular plate connected to the insulating transmission rod. The elastic force of the return spring pushes the right-angled side of the insulating triangular plate corresponding to the bimetallic resistor towards the bimetallic resistor.

[0009] As a third preferred embodiment of this utility model, the box body is provided with a label rod that is hinged and fixed at one end, hinged to the telescopic rod of the electric push-pull device in the middle, and extends out of the box body at the other end. The box body is provided with a guide groove corresponding to the label rod.

[0010] Furthermore, the middle part of the indicator rod is connected to the connecting piece via a connecting shaft and a connecting hole; the inner diameter of the connecting hole is larger than the outer diameter of the connecting shaft.

[0011] Furthermore, a spring seat is provided on both sides of the guide groove in the box body, and a thrust spring is provided on each of the two spring seats. The two thrust springs are respectively connected to the two sides of the indicator rod.

[0012] As a fourth preferred embodiment of this utility model, the electric push-pull device is connected to a solar power source.

[0013] As a fifth preferred embodiment of this utility model, a network camera corresponding to the marker pole is installed outside the box.

[0014] The beneficial effects of this utility model are as follows: 1. It realizes a direct control mechanism of bimetallic strip—insulating triangular plate—micro switch, resulting in a more direct response and more reliable structure: This utility model sets a high-temperature resistant insulating triangular plate inside the housing, causing the free end of the bimetallic resistor to bend under overcurrent conditions, which can directly drive the insulating triangular plate to rotate around its right-angle hinge point. The rotation of the insulating triangular plate directly acts on the micro switch of the electric push-pull device through the insulating transmission rod hinged to its right-angle side, forming a direct control mode with a simple structure and the shortest action link. Compared with the complex linkage or multi-stage transmission structure in the prior art, the direct control transmission path of this utility model is significantly shortened, the risk of jamming is greatly reduced, and the reliability and response speed of the action are improved.

[0015] 2. More sensitive overcurrent protection and enhanced performance: The bimetallic resistor is composed of two metal strips with different coefficients of thermal expansion. When the current exceeds the rated value, its temperature rises rapidly, resulting in a stable and predictable bending amount. The bending action directly drives the insulating triangle plate to rotate and triggers the microswitch, enabling rapid identification and tripping of abnormal currents, making the overcurrent protection characteristics more sensitive and the action more decisive and reliable.

[0016] 3. The electric push-pull device can operate in a non-electric operating compartment, significantly improving safety. By installing an insulating isolation plate inside the enclosure, the structure is divided into an electrified compartment and a non-electric operating compartment. The electric push-pull device is installed in the non-electric operating compartment, and the control mechanism is completely isolated from the live circuit. This ensures that the operation of the push-pull device is not affected by the electrified environment, effectively avoiding operational risks and improving the overall safety performance and isolation level of the device.

[0017] 4. The insulating triangular plate has an automatic reset capability and high stability. A return spring is installed between the right-angle side of the insulating triangular plate and the upper fixed frame, allowing the insulating triangular plate to automatically return to its initial position when the temperature of the bimetallic strip decreases and the free end recovers. This structure ensures that the device can automatically return to standby mode after the fault is cleared, which is beneficial for the electric push-pull device to re-close control and improves the stability of repeated operations of the device.

[0018] 5. The indicator rod mechanism accurately reflects the open / closed status of the circuit breaker. An indicator rod, linked to the telescopic rod of the electric push-pull device, is installed inside the enclosure. One end of the indicator rod extends out of the enclosure, and its movement trajectory is restricted by a guide groove. A pair of thrust springs are installed on both sides of the guide groove to assist in positioning the indicator rod, making the open / closed position of the circuit breaker clearly visible outside the enclosure, facilitating quick confirmation of the switch status by on-site maintenance personnel.

[0019] 6. Possesses independent power supply capability, improving the controllability of the circuit breaker in the event of a power outage. The electric push-pull device can be connected to a solar power source and, in conjunction with an energy storage power supply unit, enable the device to reliably perform opening and closing operations when the external power source fails or the line is de-energized, which helps improve the fault handling capability and recovery speed of the distribution network.

[0020] 7. Can be used with network cameras for remote monitoring and recording. A network camera installed outside the enclosure enables remote image monitoring of the circuit breaker status and recording of the maintenance process, facilitating visualized management and safety traceability of the distribution network operation and maintenance. Attached Figure Description

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

[0022] Figure 2 yes Figure 1 Enlarged view of part A.

[0023] Figures 3-5 yes Figure 1 Schematic diagram of the structure under different states in direction B.

[0024] Figures 3-5 In the figure, F represents the direction of the thrust of the thrust spring.

[0025] In the attached diagram, 1 is a standard vacuum tube, 2 is a housing, 3 is a connecting wire, 4 is a bimetallic resistor, 5 is an insulating triangle, 6 is an insulating transmission rod, 7 is an output wire, 8 is a conductive output terminal, 9 is an insulating sleeve, 10 is a micro switch, 11 is an insulating isolation plate, 12 is a marker rod, 13 is an electric push-pull device, 14 is a telescopic rod, 15 is a lower fixed frame, 16 is an insulating pull rod, 17 is an upper fixed frame, 18 is a support frame, 19 is a moving contact rod, 20 is a fixed conductor, 21 is a return spring, 22 is a guide groove, 23 is a thrust spring, and 24 is a spring seat. Detailed Implementation

[0026] This utility model adopts the following technical solution: It includes a housing 2, inside which is installed a standard vacuum tube 1 with a fixed conductor 20 and a movable contact rod 19. The input end of the fixed conductor 20 is located outside the housing 2, forming the main structure of the circuit breaker. The standard vacuum tube 1 undertakes the current-carrying and breaking functions of the main circuit. The input end being located outside the housing 2 facilitates external line access. An electric push-pull device 13 is installed inside the housing 2. The telescopic rod 14 of the electric push-pull device 13 is connected to the movable contact rod 19 of the standard vacuum tube 1 via an insulating pull rod 16. The electric push-pull device 13 is responsible for realizing the opening and closing actions, and the insulating pull rod 16 ensures electrical isolation during the transmission process. A bimetallic resistor 4, fixed at one end and free at the other, is installed inside the housing 2. The bimetallic resistor 4 is used to detect the temperature rise caused by the current and generate deformation to trigger a protection action. The free end of the bimetallic resistor 4 is connected to the movable contact rod 19 via the connecting wire 3; the fixed end of the bimetallic resistor 4 is connected to the conductive output terminal 8 via the output wire 7, forming a current path through the bimetallic resistor, which can heat up and trigger action according to the load current. An insulating triangular plate 5 is also installed inside the housing 2. The right-angle position of the insulating triangular plate 5 is hinged to the insulating pull rod 16. The insulating triangular plate 5 serves as a force transmission mechanism after the bimetallic resistor 4 is activated, and the hinge ensures its rotation. One right-angle side of the insulating triangular plate 5 corresponds to the free end of the bimetallic resistor 4. When the bimetallic resistor 4 is heated and bent, its free end pushes against this right-angle side, causing the triangular plate to rotate. An insulating transmission rod 6 is hinged to the other right-angle side of the insulating triangular plate 5. The end of the insulating transmission rod 6 corresponds to the micro switch 10 of the electric push-pull device 13. After the insulating triangular plate 5 rotates, it drives the insulating transmission rod 6, triggering the micro switch 10, thereby achieving protective actions such as power-off or shutdown of the electric push-pull device 13. The bimetallic resistor 4 is composed of two metal sheets with different coefficients of thermal expansion. When the temperature of the bimetallic resistor 4 rises due to excessive current, the two metal sheets elongate by different lengths, causing the free end of the bimetallic resistor 4 to bend towards the insulating triangular plate 5. This pushes the insulating triangular plate 5 to rotate, causing the insulating transmission rod 6 to act on the micro switch 10. By utilizing the displacement generated by the different expansion characteristics, the protection mechanism is automatically triggered when the current is overloaded.

[0027] An insulating isolation plate 11 is installed inside the housing 2. One side of the insulating isolation plate 11 is a non-electric operating compartment, and the other side is an electric compartment; this achieves physical isolation between the electric parts and the operating mechanism, improving safety. The electric push-pull device 13 is installed inside the non-electric operating compartment. The telescopic rod 14 of the electric push-pull device 13 passes through the insulating isolation plate 11 and is connected to the insulating pull rod 16 inside the electric compartment; this ensures that the operating mechanism is in a safe area while maintaining effective transmission. The micro switch 10 is installed inside the electric compartment, and an insulating sleeve 9 is installed outside the insulating transmission rod 6.

[0028] The insulating pull rod 16 is equipped with a support frame 18 for the insulating triangular plate 5. The right-angle position of the insulating triangular plate 5 is hinged to the support frame 18, forming a stable fulcrum and making the operation of the triangular plate more reliable. The bimetallic resistor 4 is mounted on the insulating pull rod 16, and the insulating pull rod 16 is also equipped with an upper fixing frame 17; this ensures that the bimetallic strip and the triangular plate maintain the same structural reference, improving the accuracy of the protection action. The upper end of the insulating sleeve 9 is connected to the upper fixing frame 17, and the lower end of the insulating sleeve 9 is connected to the lower fixing frame 15 at the lower end of the insulating pull rod 16. This ensures the stable installation position of the insulating sleeve 9 and improves the guiding nature of the transmission rod movement.

[0029] A return spring 21 is provided between the upper fixed frame 17 and the right-angled side connecting the insulating triangular plate 5 and the insulating transmission rod 6. The elastic force of the return spring 21 pushes the right-angled side of the insulating triangular plate 5 and the bimetallic resistor 4 towards the bimetallic resistor 4.

[0030] The housing 2 contains a marker rod 12, which is hinged at one end and connected to the telescopic rod 14 of the electric push-pull device 13 in the middle, with the other end extending out of the housing 2. The housing 2 has a guide groove 22 corresponding to the marker rod 12. The marker rod 12 moves synchronously with the push-pull device for external observation of the opening and closing status; the guide groove 22 is used to limit the movement trajectory of the marker rod 12.

[0031] The middle part of the indicator rod 12 is connected to the connecting piece via a connecting shaft and a connecting hole; the inner diameter of the connecting hole is larger than the outer diameter of the connecting shaft. This creates a connection method that allows for slight angular changes or floating, preventing transmission jamming.

[0032] Inside the housing 2, a spring seat 24 is provided on both sides of the middle of the guide groove 22. A thrust spring 23 is provided on each of the two spring seats 24, and the two thrust springs 23 are respectively connected to the two sides of the indicator rod 12. This forms a neutral or return force, so that the indicator rod 12 can stably return to the set position after movement.

[0033] The electric push-pull device 13 is connected to a solar power source, enabling independent power supply and allowing the circuit breaker to be used in scenarios without external power, thus improving its applicability.

[0034] A network camera corresponding to the indicator pole 12 is installed outside the housing 2. It is used to remotely monitor the status of the indicator pole 12, making the opening and closing status visible and improving the automated monitoring capability.

[0035] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. 10kV electrically controlled direct-acting vacuum circuit breaker, comprising a housing (2), wherein a standard vacuum tube (1) with a fixed conductor (20) and a movable contact rod (19) is provided inside the housing (2), the input end of the fixed conductor (20) is located outside the housing (2), and an electric push-pull device (13) is provided inside the housing (2), wherein the telescopic rod (14) of the electric push-pull device (13) is connected to the movable contact rod (19) of the standard vacuum tube (1) through an insulating pull rod (16), characterized in that: The housing (2) contains a bimetallic resistor (4) with one end fixed and the other end free. The free end of the bimetallic resistor (4) is connected to the movable contact rod (19) via a connecting wire (3). The fixed end of the bimetallic resistor (4) is connected to the conductive output end (8) via an output wire (7). The housing (2) also contains an insulating triangular plate (5). The right-angle position of the insulating triangular plate (5) is hinged to the insulating pull rod (16). One right-angle side of the insulating triangular plate (5) corresponds to the free end of the bimetallic resistor (4). An insulating transmission rod (6) is hinged to the other right-angle side of 5). The end of the insulating transmission rod (6) corresponds to the micro switch (10) of the electric push-pull device (13). The bimetallic resistor (4) is composed of two metal sheets with different coefficients of thermal expansion. When the temperature of the bimetallic resistor (4) rises due to excessive current, the two metal sheets are heated and elongated by different lengths, causing the free end of the bimetallic resistor (4) to bend toward the insulating triangle plate (5), pushing the insulating triangle plate (5) to rotate, so that the insulating transmission rod (6) acts on the micro switch (10).

2. The 10kV electrically controlled direct-acting vacuum circuit breaker according to claim 1, characterized in that: An insulating isolation plate (11) is provided inside the housing (2). One side of the insulating isolation plate (11) is a non-electric operation chamber, and the other side is an electric chamber. The electric push-pull device (13) is located inside the non-electric operation chamber. The telescopic rod (14) of the electric push-pull device (13) passes through the insulating isolation plate (11) and is connected to the insulating pull rod (16) inside the electric chamber. The micro switch (10) is located inside the electric chamber. An insulating sleeve (9) is provided outside the insulating transmission rod (6).

3. The 10kV electrically controlled direct-acting vacuum circuit breaker according to claim 2, characterized in that: The insulating rod (16) is provided with a support frame (18) for an insulating triangular plate (5). The right-angle position of the insulating triangular plate (5) is hinged to the support frame (18). The bimetallic resistor (4) is provided on the insulating rod (16). The insulating rod (16) is also provided with an upper fixing frame (17). The upper end of the insulating sleeve (9) is connected to the upper fixing frame (17), and the lower end of the insulating sleeve (9) is connected to the lower fixing frame (15) at the lower end of the insulating rod (16).

4. The 10kV electrically controlled direct-acting vacuum circuit breaker according to claim 3, characterized in that: A return spring (21) is provided between the right-angled side of the upper fixed frame (17) and the insulating triangle plate (5) and the insulating transmission rod (6). The elastic force of the return spring (21) pushes the right-angled side of the insulating triangle plate (5) and the bimetallic resistor (4) toward the bimetallic resistor (4).

5. The 10kV electrically controlled direct-acting vacuum circuit breaker according to claim 1, characterized in that: The box (2) is provided with a sign bar (12) that is hinged and fixed at one end, hinged to the telescopic rod (14) of the electric pusher (13) in the middle, and the other end extends out of the box (2). The box (2) is provided with a guide groove (22) corresponding to the sign bar (12).

6. The 10kV electrically controlled direct-acting vacuum circuit breaker according to claim 5, characterized in that: The middle part of the indicator rod (12) is connected to the connecting piece by a connecting shaft and a connecting hole; the inner diameter of the connecting hole is larger than the outer diameter of the connecting shaft.

7. The 10kV electrically controlled direct-acting vacuum circuit breaker according to claim 6, characterized in that: A spring seat (24) is provided on both sides of the middle part of the guide groove (22) inside the box (2), and a thrust spring (23) is provided on each of the two spring seats (24). The two thrust springs (23) are respectively connected to the two sides of the indicator rod (12).

8. The 10kV electrically controlled direct-acting vacuum circuit breaker according to claim 1, characterized in that: The electric push-pull device (13) is connected to a solar power source.

9. The 10kV electrically controlled direct-acting vacuum circuit breaker according to claim 1, characterized in that: A network camera corresponding to the marker pole (12) is installed outside the box (2).

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