A pole-mounted circuit breaker comprising an oil buffer

Abstract

The utility model provides a kind of including oil buffer device's pole circuit breaker, pole circuit breaker includes fixed plate and main shaft, fixed plate is located above the main shaft, oil buffer device includes: oil buffer device, oil buffer device includes oil buffer and mounting bracket, oil buffer includes buffer rod and sleeve, buffer rod can slide in the inside of sleeve, mounting bracket includes integrally formed first mounting plate and two second mounting plates, second mounting plate is respectively perpendicular to the opposite ends of first mounting plate, second mounting plate is fixed to fixed plate, first mounting plate is provided with first through-hole, sleeve is installed in first through-hole by limiting nut;Trapezoidal stopper, trapezoidal stopper is integrally formed in the upper end of main shaft, trapezoidal stopper is located in the side close to buffer rod, trapezoidal stopper can be butted to buffer rod.According to the technical scheme of the embodiment, the energy released by the oil buffer absorbs the opening spring, reduces the impact on the shell of pole circuit breaker, and improves the stability of pole circuit breaker.

Description

Technical Field

[0001] This utility model belongs to the technical field of ZW32 pole-mounted circuit breakers, and particularly relates to a pole-mounted circuit breaker including an oil buffer device. Background Technology

[0002] The ZW32 pole-mounted circuit breaker is an outdoor high-voltage vacuum circuit breaker, mainly used in 12kV voltage level distribution networks. The ZW32 pole-mounted circuit breaker uses a vacuum interrupter chamber, combined with a tripping spring or permanent magnet operating mechanism, resulting in a compact structure and high operational reliability.

[0003] Currently, the ZW32 pole-mounted circuit breaker uses a vacuum interrupter combined with a tripping spring to achieve the tripping action. The tripping spring stores energy when the ZW32 pole-mounted circuit breaker is closed and releases energy when it is tripped, thus achieving the tripping action. However, due to the large elastic coefficient of the tripping spring, in order to complete the tripping action of the ZW32 pole-mounted circuit breaker in a very short time, the energy released instantaneously by the spring is extremely large. During the process of the main shaft speed of the ZW32 pole-mounted circuit breaker decreasing to a standstill, after the energy released by the spring drives the ZW32 pole-mounted circuit breaker to trip, the remaining energy directly acts on the casing of the ZW32 pole-mounted circuit breaker, resulting in unstable operation and low operational stability. Utility Model Content

[0004] This utility model provides a pole-mounted circuit breaker including an oil buffer device, which can improve the operational stability of the pole-mounted circuit breaker.

[0005] In a first aspect, this utility model embodiment provides an oil buffer device, wherein the column-mounted circuit breaker includes a fixing plate and a main shaft, the fixing plate being located above the main shaft, and includes: An oil buffer device includes an oil damper and a mounting bracket. The oil damper includes a damping rod and a sleeve. The damping rod can slide inside the sleeve. The mounting bracket includes an integrally formed first mounting plate and two second mounting plates. The second mounting plates are perpendicular to opposite ends of the first mounting plate and are fixed to the fixed plate. The first mounting plate is provided with a first through hole. The sleeve is installed in the first through hole by a limiting nut. A trapezoidal stop block is integrally formed on the upper end of the main shaft. The trapezoidal stop block is located on the side close to the buffer rod and can abut against the buffer rod.

[0006] According to some embodiments of the present invention, it further includes: an indicator component, the indicator component including an indicator sign and a pointer, the pointer being connected to the main shaft via a first transmission shaft and a first transmission block, the first transmission shaft being vertically fixed to the main shaft, one end of the first transmission block being vertically connected to the pointer, and the other end being vertically connected to the first transmission shaft, the first transmission shaft being used to drive the first transmission block to rotate, and the first transmission block being used to drive the pointer to rotate synchronously.

[0007] The pole-mounted circuit breaker includes a housing, a fixing plate fixed to the top inside the housing, and a main shaft located inside the housing. According to some embodiments of the present invention, it further includes a buffer pad, which is fixed inside the housing, and the main shaft can abut against the buffer pad.

[0008] According to some embodiments of this utility model, it further includes: two opening springs, which are respectively installed on both sides of the oil buffer device. One end of the opening spring is installed on the first drive shaft through a first hanging spring plate, and the other end is installed on the housing through a second hanging spring plate.

[0009] According to some embodiments of the present invention, the lower end of the fixing plate is provided with a horizontal limiting hole, the main shaft is fixed with a first limiting block, the first limiting block passes through the horizontal limiting hole, and the first limiting block can slide horizontally inside the horizontal limiting hole.

[0010] According to some embodiments of the present invention, it further includes: a first transmission plate, wherein each of the two opposite ends of the first transmission plate is provided with a second through hole, the fixed plate is provided with a vertical limiting hole, and the lower end of the support column of the pole-mounted circuit breaker is fixed with a second limiting block, the second limiting block being able to slide vertically inside the vertical limiting hole, and the first limiting block and the second limiting block respectively passing through the second through hole.

[0011] According to some embodiments of the present invention, it further includes: an auxiliary switch, the auxiliary switch including a transmission prism, a fixing block provided at the upper end of the main shaft, the transmission prism being fixed to one end of a second transmission block, the other end of the second transmission block being provided with a U-shaped notch, and the fixing block being located inside the U-shaped notch.

[0012] According to some embodiments of the present invention, the end of the second mounting plate away from the first mounting plate is fixed to the fixing plate, and the connection between the second mounting plate and the fixing plate is higher than the horizontal height of the first through hole; the length of the trapezoidal stop block at the end near the main shaft is greater than the length of the end away from the main shaft.

[0013] This utility model provides a pole-mounted circuit breaker including an oil buffer device. The pole-mounted circuit breaker includes a fixed plate and a main shaft. The fixed plate is located above the main shaft. The embodiment of this utility model includes: an oil buffer device comprising an oil damper and a mounting bracket; the oil damper includes a damping rod and a sleeve; the damping rod is slidable inside the sleeve; the mounting bracket includes an integrally formed first mounting plate and two second mounting plates; the second mounting plates are perpendicular to opposite ends of the first mounting plate and fixed to the fixed plate; the first mounting plate has a first through hole; the sleeve is installed in the first through hole by a limiting nut; and a trapezoidal stop block integrally formed on the upper end of the main shaft, located near the damping rod, and capable of abutting against the damping rod. According to the technical solution of this embodiment, by adding an oil buffer and a trapezoidal stop, when the opening spring of the pole-mounted circuit breaker rebounds from the stretched state to the natural state and releases energy, the opening spring drives the main shaft to move horizontally so that the trapezoidal stop moves. The trapezoidal stop abuts against the oil buffer and transfers the remaining energy to the oil buffer. The energy is absorbed by the oil buffer with high energy absorption efficiency, thereby reducing the impact on the housing of the pole-mounted circuit breaker and improving the operational stability of the pole-mounted circuit breaker. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal structure of the box housing of a pole-mounted circuit breaker according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the mounting bracket provided in another embodiment of the present invention; Figure 3 This is a front view of a pole-mounted circuit breaker provided in another embodiment of the present invention; Figure 4 This is a partial schematic diagram of the interior of the box of a pole-mounted circuit breaker provided in another embodiment of this utility model. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0016] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. Terms such as "first," "objective," etc., in the specification, claims, or the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0017] This utility model provides a pole-mounted circuit breaker including an oil buffer device. The pole-mounted circuit breaker includes a fixed plate and a main shaft. The fixed plate is located above the main shaft. The embodiment of this utility model includes: an oil buffer device comprising an oil damper and a mounting bracket; the oil damper includes a damping rod and a sleeve; the damping rod is slidable inside the sleeve; the mounting bracket includes an integrally formed first mounting plate and two second mounting plates; the second mounting plates are perpendicular to opposite ends of the first mounting plate and fixed to the fixed plate; the first mounting plate has a first through hole; the sleeve is installed in the first through hole by a limiting nut; and a trapezoidal stop block integrally formed on the upper end of the main shaft, located near the damping rod, and capable of abutting against the damping rod. According to the technical solution of this embodiment, by adding an oil buffer and a trapezoidal stop, when the opening spring of the pole-mounted circuit breaker rebounds from the stretched state to the natural state and releases energy, the opening spring drives the main shaft to move horizontally so that the trapezoidal stop moves. The trapezoidal stop abuts against the oil buffer and transfers the remaining energy to the oil buffer. The energy is absorbed by the oil buffer with high energy absorption efficiency, thereby reducing the impact on the housing of the pole-mounted circuit breaker and improving the operational stability of the pole-mounted circuit breaker.

[0018] Reference Figure 1 and Figure 2 The pole-mounted circuit breaker 100 includes a fixing plate 10 and a main shaft 20. The fixing plate 10 is located above the main shaft 20. The pole-mounted circuit breaker 100 provided in this embodiment includes: The oil buffer device includes an oil buffer 31 and a mounting bracket 32. The oil buffer 31 includes a buffer rod and a sleeve. The buffer rod can slide inside the sleeve. The mounting bracket 32 ​​includes an integrally formed first mounting plate 321 and two second mounting plates 322. The second mounting plates 322 are perpendicular to the opposite ends of the first mounting plate 321 and are fixed to the fixing plate 10. The first mounting plate 321 is provided with a first through hole. The sleeve is installed in the first through hole by a limiting nut. Trapezoidal stop 21 is integrally formed on the upper end of main shaft 20. Trapezoidal stop 21 is located on the side close to buffer rod and can abut against buffer rod.

[0019] It should be noted that the pole-mounted circuit breaker 100 includes three supports, and a fixing plate 10 is fixed to the bottom of the supports of the pole-mounted circuit breaker 100. The cross-section of the fixing plate 10 is U-shaped. A fixing plate 10 is provided under each support. The fixing plate 10 provides a mounting position for the mounting bracket 32. There is no need to add other components inside the box of the pole-mounted circuit breaker 100, thus keeping the structure of the pole-mounted circuit breaker 100 compact.

[0020] It should be noted that the oil buffer device includes an oil buffer 31 and a mounting bracket 32. The oil buffer 31 is fixed to the fixed plate 10 by the mounting bracket 32. The oil buffer 31 includes a buffer rod and a sleeve. When the oil buffer 31 is not in use, the length of the oil buffer 31 is at its maximum, that is, the length of the buffer rod inside the sleeve is at its minimum. When the trapezoidal stop 21 abuts against the buffer rod and applies pressure to the buffer rod, the length of the buffer rod inside the sleeve gradually increases, and the oil buffer 31 applies a force in the opposite direction to the trapezoidal stop 21. The oil buffer 31 reduces the horizontal movement speed of the main shaft 20 through the trapezoidal stop 21.

[0021] It should be noted that a trapezoidal stop 21 is used, with the two surfaces of the trapezoidal stop 21 and the buffer rod being parallel to each other. The end of the trapezoidal stop 21 away from the buffer rod is sloping, which further provides support for the trapezoidal stop 21 and avoids the impact on the stability of the trapezoidal stop 21 when it comes into contact with the buffer rod due to the excessive moving speed of the main shaft 20.

[0022] It should be noted that the pole-mounted circuit breaker 100 in this application is the ZW32 pole-mounted circuit breaker 100, relating to the fields of power generation, substation, or distribution technology. The ZW32 pole-mounted circuit breaker 100 is an outdoor high-voltage vacuum circuit breaker, mainly used in 12kV voltage level distribution networks, designed to improve urban and rural power transmission and distribution networks. The ZW32 pole-mounted circuit breaker 100 uses a vacuum arc-extinguishing chamber combined with a spring or permanent magnet operating mechanism, resulting in a compact structure and high reliability. The ZW32 pole-mounted circuit breaker 100 employs vacuum arc-extinguishing technology to quickly interrupt the electric arc in a closed environment using a high-vacuum medium, achieving a breaking capacity of over 20kA; it adopts a fully sealed design, using a high-vacuum medium to quickly interrupt the electric arc in a closed environment, achieving a breaking capacity of over 20kA; it uses intelligent control, integrating electronic sensors, supporting remote opening and closing operations and status monitoring. Furthermore, the ZW32 pole-mounted circuit breaker 100 produces no SF6 gas, conforming to global emission reduction trends and possessing environmental friendliness. The ZW32 pole-mounted circuit breaker 100 is used in distribution network automation and substation outgoing line protection. In distribution network automation, it is used for urban power grid upgrades and rural power grid transformation, enabling rapid fault isolation. In substation outgoing line protection, it serves as a key protection device for substations below 35kV. In the industrial and new energy sectors, it ensures power security for high-energy-consuming enterprises such as steel and chemical plants. In the new energy grid connection sector, it is used for collector line protection in wind farms and photovoltaic power plants, adapting to fluctuating power supply requirements. The ZW32 pole-mounted circuit breaker 100 includes an arc-extinguishing system, operating mechanism, insulation structure, housing and sealing system, current transformer, and control and protection unit. The modular design of the ZW32 pole-mounted circuit breaker 100 balances functionality and ease of maintenance, suitable for the intelligent management needs of 10kV~35kV distribution lines.

[0023] It should be noted that the pole-mounted circuit breaker 100 of this application adds an oil buffer device to the existing ZW32 circuit breaker structure. When the opening and closing operations are performed by the opening spring 60, the buffer absorbs the excess energy released by the opening spring 60, making the operation of the ZW32 pole-mounted circuit breaker 100 more stable.

[0024] It should be noted that the pole-mounted circuit breaker 100 includes a tripping spring 60. When the pole-mounted circuit breaker 100 is in the closed state, the tripping spring 60 is stretched and stores energy. When the tripping operation of the pole-mounted circuit breaker 100 is triggered, the tripping spring 60 returns to its natural state under the action of elastic force and releases a large amount of energy, thereby realizing the tripping operation of the pole-mounted circuit breaker 100. One end of the tripping spring 60 is fixed to the main shaft 20, and the other end is fixed to the housing 50 of the pole-mounted circuit breaker 100. When the tripping spring 60 changes from the stretched state to the natural state, the tripping spring 60 contracts, thereby driving the main shaft 20 to move horizontally.

[0025] It should be noted that after the pole-mounted circuit breaker 100 completes the tripping operation, the trapezoidal stop 21 of the main shaft 20 abuts against the buffer rod of the oil buffer 31. The trapezoidal stop 21 transfers excess energy to the buffer rod, which slides inside the sleeve. This allows the oil buffer 31 to absorb the excess energy released by the tripping spring 60, preventing the main shaft 20 from impacting the housing 50 under the drive of the tripping spring 60. This greatly reduces the impact force on the housing 50 and improves the overall operational stability of the pole-mounted circuit breaker 100.

[0026] It should be noted that, because the pole-mounted circuit breaker 100 needs to complete the tripping action in a very short time, a tripping spring 60 with a high elastic coefficient is used. This allows the tripping spring 60 of the same length to store more energy to drive the pole-mounted circuit breaker 100 to perform the tripping action. However, the energy released by the tripping spring 60 with a high elastic coefficient is extremely large. The main shaft 20 moves horizontally under the drive of the tripping spring 60 until its speed drops to zero. However, part of the energy released by the tripping spring 60 is used to drive the pole-mounted circuit breaker 100 to perform the tripping operation, while the remaining part ultimately acts directly on the housing 50 of the pole-mounted circuit breaker 100, causing the housing 50 to be impacted and reducing the operational stability of the pole-mounted circuit breaker 100.

[0027] It should be noted that when the pole-mounted circuit breaker 100 is triggered to open, the opening spring 60 returns to its natural state under the action of elastic force and releases a large amount of energy, thereby realizing the opening operation of the pole-mounted circuit breaker 100. One end of the opening spring 60 is fixed to the main shaft 20, and the other end is fixed to the housing 50 of the pole-mounted circuit breaker 100. When the opening spring 60 changes from the stretched state to the natural state, the opening spring 60 contracts, thereby driving the main shaft 20 to move horizontally. After the pole-mounted circuit breaker 100 completes the opening operation, the trapezoidal stop 21 of the main shaft 20 abuts against the buffer rod of the oil buffer 31. The trapezoidal stop 21 transfers the excess energy to the buffer rod, and the buffer rod slides inside the sleeve, thereby realizing that the oil buffer 31 absorbs the excess energy released by the opening spring 60, greatly reducing the impact force on the housing 50 and improving the overall operational stability of the pole-mounted circuit breaker 100. After the addition of the oil buffer 31 of this application, the unused portion of the energy released by the trip spring 60 is absorbed by the oil buffer 31 with high energy absorption efficiency, thereby reducing the impact on the housing 50 and improving the operational stability of the pole-mounted circuit breaker 100.

[0028] Additionally, in one embodiment, reference is made to Figure 3 and Figure 4 It also includes: The indicator component 40 includes an indicator plate 41 and a pointer 42. The pointer 42 is connected to the main shaft 20 via a first drive shaft 22 and a first drive block 43. The first drive shaft 22 is vertically fixed to the main shaft 20. One end of the first drive block 43 is vertically connected to the pointer 42, and the other end is vertically connected to the first drive shaft 22. The first drive shaft 22 is used to drive the first drive block 43 to rotate, and the first drive block 43 is used to drive the pointer 42 to rotate synchronously.

[0029] It should be noted that the indicator component 40 represents the status of the pole-mounted circuit breaker 100, and the indicator plate 41 is marked with "open" and "closed". When the pointer 42 is in the first position, the pointer 42 points to "open", and when the pointer 42 is in the second position, the pointer 42 points to "closed".

[0030] It should be noted that when the pole-mounted circuit breaker 100 needs to perform a tripping operation, the pointer 42 is in the second position, the tripping spring 60 releases energy, and the main shaft 20 and the first transmission shaft 22 move horizontally under the drive of the tripping spring 60. Under the drive of the first transmission shaft 22, the first transmission block 43 drives the pointer 42 to rotate.

[0031] It should be noted that the first transmission block 43 is provided with a U-shaped notch. The first transmission block 43 is fixed to the pointer 42. The first transmission shaft 22 is located inside the U-shaped notch of the first transmission block 43. When the first transmission shaft 22 moves horizontally, the first transmission shaft 22 moves inside the U-shaped notch, thereby driving the first transmission block 43 to rotate and causing the pointer 42 to rotate.

[0032] Additionally, the pole-mounted circuit breaker 100 includes a housing 50, a fixing plate 10 fixed to the top inside the housing 50, and a main shaft 20 located inside the housing 50. In one embodiment, refer to... Figure 4 It also includes: The buffer pad 51 is fixed inside the housing 50, and the main shaft 20 can abut against the buffer pad 51.

[0033] It should be noted that the buffer pad 51 and the oil damper 31 together absorb the excess energy released by the opening spring 60, further reducing the impact on the housing 50. After the oil damper 31 absorbs the energy of the spindle 20 to reduce the speed of the spindle 20, the speed of the spindle 20 may not have completely dropped to 0. Therefore, the buffer pad 51 is set between the spindle 20 and the housing 50. When the spindle 20 moves horizontally, the spindle 20 abuts against the buffer pad 51. The buffer pad 51 prevents the spindle 20 from colliding with the housing 50, further reducing the impact on the housing 50.

[0034] It should be noted that by adding the oil buffer 31 and the trapezoidal stop 21, when the opening spring 60 rebounds, the opening spring 60 drives the main shaft 20 to move horizontally so that the trapezoidal stop 21 moves. Under the action of the oil buffer 31, part of the energy of the opening spring 60 is absorbed, reducing the impact on the housing 50 of the pole-mounted circuit breaker 100, thereby improving the stability of the pole-mounted circuit breaker 100.

[0035] Additionally, in one embodiment, reference is made to Figure 4 It also includes: Two opening springs 60 are installed on both sides of the oil buffer device. One end of the opening spring 60 is installed on the first drive shaft 22 through the first hanging spring plate 61, and the other end is installed on the housing 50 through the second hanging spring plate 62.

[0036] It should be noted that the horizontal movement of the main shaft 20 is achieved by the opening spring 60, and the stability of the opening spring 60 in the stretched state is maintained by the hanging spring plate. When the opening spring 60 rebounds, the second hanging spring plate 62 remains stationary, and the opening spring 60 drives the main shaft 20 to move through the first hanging spring plate 61 to realize the opening operation of the pole-mounted circuit breaker 100.

[0037] It should be noted that by setting the first spring plate 61 and the second spring plate 62, it is convenient to install the stretched opening spring 60 onto the pole-mounted circuit breaker 100.

[0038] Additionally, in one embodiment, reference is made to Figure 1The lower end of the fixed plate 10 is provided with a horizontal limiting hole 11, and the main shaft 20 is fixed with a first limiting block 111. The first limiting block 111 passes through the horizontal limiting hole 11 and can slide horizontally inside the horizontal limiting hole 11.

[0039] It should be noted that when the spindle 20 moves horizontally, the first limiting block 111 slides in the horizontal limiting hole 11. The first limiting block 111 and the horizontal limiting hole 11 work together to ensure the stability of the spindle 20 during horizontal movement. The displacement length of the first limiting block 111 is controlled by the length of the horizontal limiting hole 11, that is, the displacement length of the spindle 20 is controlled, thereby reducing the impact force of the spindle 20 on the housing 50.

[0040] Additionally, in one embodiment, reference is made to Figure 1 It also includes: The first transmission plate has second through holes at both opposite ends. The fixed plate 10 has a vertical limiting hole 12. The lower end of the support column of the pole-mounted circuit breaker 100 is fixed with a second limiting block 121. The second limiting block 121 can slide vertically inside the vertical limiting hole 12. The first limiting block 111 and the second limiting block 121 are respectively inserted through the second through hole.

[0041] It should be noted that the second limiting block 121 and the vertical limiting hole 12 work together to ensure that the support column only has displacement in the vertical direction. When the support column moves vertically, the second limiting block 121 moves vertically, driving the first transmission plate to rotate so that the first limiting block 111 moves horizontally, thereby causing the main shaft 20 to move horizontally.

[0042] It should be noted that in this application, in the open state, the first limit block 111 is located at the right end of the horizontal limit hole 11, and the second limit block 121 is located at the bottom end of the vertical limit hole 12; in the closed state, the first limit block 111 is located at the left end of the horizontal limit hole 11, and the second limit block 121 is located at the top end of the vertical limit hole 12; when the pole-mounted circuit breaker 100 changes from the closed state to the open state, the second limit block 121 moves downward, thereby driving the first transmission plate to rotate along the second limit block 121. Since the second limit hole also has vertical displacement, the first transmission plate drives the first limit block 111 to move to the right. When the first limit block 111 is located at the right end of the horizontal limit hole 11 and the second limit block 121 is located at the bottom end of the vertical limit hole 12, the pole-mounted circuit breaker 100 changes to the open state.

[0043] Additionally, in one embodiment, reference is made to Figure 1 It also includes: The auxiliary switch 70 includes a transmission prism 71. A fixing block 23 is provided at the upper end of the main shaft 20. The transmission prism 71 is fixed to one end of the second transmission block 72. A U-shaped notch is provided at the other end of the second transmission block 72. The fixing block 23 is located inside the U-shaped notch.

[0044] It should be noted that when the main shaft 20 moves horizontally, the fixed block 23 moves horizontally synchronously with the main shaft 20, and drives the transmission prism 71 to rotate through the U-shaped notch of the second transmission block 72. The auxiliary switch 70 determines the position of the main shaft 20 based on the angle of the transmission prism 71, thereby determining the state of the pole-mounted circuit breaker 100.

[0045] Additionally, in one embodiment, reference is made to Figure 1 and Figure 2 The end of the second mounting plate 322 away from the first mounting plate 321 is fixed to the fixing plate 10, and the connection between the second mounting plate 322 and the fixing plate 10 is higher than the horizontal height of the first through hole; the length of the trapezoidal stop 21 near the main shaft 20 is greater than the length of the end away from the main shaft 20.

[0046] It should be noted that by adjusting the second mounting plate 322 so that the connection between the second mounting plate 322 and the fixing plate 10 is at a different horizontal height from the first through hole, when the oil buffer 31 abuts against the trapezoidal stop 21, the oil buffer 31 is only subjected to force from the horizontal direction. The installation position of the second mounting plate 322 disperses the impact force to the vertical and horizontal directions, avoiding the impact force from the horizontal direction and reducing the impact on the housing 50 of the pole-mounted circuit breaker 100.

[0047] It should be noted that the longitudinal section of the trapezoidal stop 21 is a right trapezoid, which increases the contact area between the trapezoidal stop 21 and the main shaft 20. The inclined waist of the right trapezoid provides support for the trapezoidal stop 21, preventing the stop from being damaged by impact, and enabling the stop to better withstand the energy release of the opening spring 60.

[0048] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein.

[0049] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

[0050] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present utility model.

Claims

1. A pole-mounted circuit breaker including an oil buffer device, the pole-mounted circuit breaker comprising a fixed plate and a main shaft, the fixed plate being located above the main shaft, characterized in that, The pole-mounted circuit breaker includes: An oil buffer device includes an oil damper and a mounting bracket. The oil damper includes a damping rod and a sleeve. The damping rod can slide inside the sleeve. The mounting bracket includes an integrally formed first mounting plate and two second mounting plates. The second mounting plates are perpendicular to opposite ends of the first mounting plate and are fixed to the fixed plate. The first mounting plate is provided with a first through hole. The sleeve is installed in the first through hole by a limiting nut. A trapezoidal stop block is integrally formed on the upper end of the main shaft. The trapezoidal stop block is located on the side close to the buffer rod and can abut against the buffer rod.

2. The pole-mounted circuit breaker according to claim 1, characterized in that, Also includes: An indicator component includes an indicator sign and a pointer. The pointer is connected to the main shaft via a first drive shaft and a first drive block. The first drive shaft is vertically fixed to the main shaft. One end of the first drive block is vertically connected to the pointer, and the other end is vertically connected to the first drive shaft. The first drive shaft is used to drive the first drive block to rotate, and the first drive block is used to drive the pointer to rotate synchronously.

3. The pole-mounted circuit breaker according to claim 2, wherein the pole-mounted circuit breaker includes a housing, the fixing plate is fixed to the top inside the housing, and the main shaft is located inside the housing, characterized in that, Also includes: A buffer pad is fixed inside the housing, and the main shaft can abut against the buffer pad.

4. The pole-mounted circuit breaker according to claim 3, characterized in that, Also includes: Two opening springs are respectively installed on both sides of the oil buffer device. One end of the opening spring is installed on the first drive shaft through the first spring plate, and the other end is installed on the housing through the second spring plate.

5. The pole-mounted circuit breaker according to claim 3, characterized in that: The lower end of the fixed plate is provided with a horizontal limiting hole, and the main shaft is fixed with a first limiting block. The first limiting block passes through the horizontal limiting hole and can slide horizontally inside the horizontal limiting hole.

6. The pole-mounted circuit breaker according to claim 5, characterized in that, Also includes: The first transmission plate has second through holes at both opposite ends. The fixed plate has vertical limiting holes. The lower end of the support column of the pole-mounted circuit breaker is fixed with a second limiting block. The second limiting block can slide vertically inside the vertical limiting hole. The first limiting block and the second limiting block are respectively inserted through the second through holes.

7. The pole-mounted circuit breaker according to claim 1, characterized in that, Also includes: An auxiliary switch includes a transmission prism, a fixing block is provided at the upper end of the main shaft, the transmission prism is fixed to one end of a second transmission block, the other end of the second transmission block is provided with a U-shaped notch, and the fixing block is located inside the U-shaped notch.

8. The pole-mounted circuit breaker according to claim 1, characterized in that: The end of the second mounting plate away from the first mounting plate is fixed to the fixing plate, and the connection between the second mounting plate and the fixing plate is higher than the horizontal height of the first through hole; The length of the trapezoidal stop block at the end closest to the main shaft is greater than the length of the end furthest from the main shaft.

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