Circuit breaker capable of improving on-off performance of contact and intelligent switch cabinet

Abstract

The invention discloses a circuit breaker capable of improving contact breaking performance and an intelligent switch cabinet in the technical field of switch equipment, and the circuit breaker comprises a body of which the bottom is provided with an electric chassis vehicle, an arc extinguish chamber which is arranged on the electric chassis vehicle at the rear part of the body, and an operating mechanism which is arranged in the body. The execution end of the operating mechanism is connected with the transmission mechanism of the circuit breaker. An auxiliary opening pressure spring is arranged in the operating mechanism, the first end of the auxiliary opening pressure spring is fixed, and after the auxiliary opening pressure spring stores energy through an energy storage unit in the operating mechanism, the second end of the auxiliary opening pressure spring is connected with a transmission mechanism of the circuit breaker. According to the invention, by arranging the auxiliary opening pressure spring, the opening speed is improved, and the breaking performance of the circuit breaker is improved; the auxiliary opening pressure spring ingeniously stores energy through the energy storage mechanism, the functions of the system are fully utilized, and the mechanical performance of the circuit breaker is improved. The intelligent device of the switch cabinet monitors the state of the circuit breaker in real time, discovers potential hidden dangers in advance, predicts equipment fault risks, and helps customers to improve operation and maintenance efficiency and reduce operation and maintenance cost.

Description

Technical Field

[0001] The present application relates to the technical field of switchgear, and specifically to an intelligent circuit breaker and an intelligent switch cabinet for improving contact breaking performance. Background Art

[0002] With the rapid development and improvement of China's national power grid, society's demand for electricity is increasing. The continuous expansion of grid capacity is forcing voltage levels to rise continuously. Consequently, the power system's requirements for the reliability and stability of switchgear are becoming increasingly stringent, primarily testing the closing and opening characteristics of circuit breakers. Circuit breaker closing is ensured by an energy storage mechanism, which provides sufficient closing speed and force to ensure a smooth closing process.

[0003] One of the current difficulties in limiting the increase in voltage levels of circuit breakers is that the energy storage of the tripping spring is limited, resulting in a limited tripping speed and a long arcing time. After the contacts are separated, they are prone to re-breakdown, resulting in breaking failure. At the same time, the switch cabinet has a poor level of intelligence and is unable to meet the increasing demand for intelligence. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present application provides a circuit breaker and an intelligent switch cabinet with improved contact breaking performance to solve the problems of the above-mentioned existing technology that the opening speed is difficult to improve and the degree of intelligence is poor.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions:

[0006] An intelligent circuit breaker for improving contact breaking performance includes a body, an arc extinguishing chamber, an operating mechanism, and a transmission mechanism. An electric chassis is provided at the bottom of the body, and the arc extinguishing chamber is provided on the electric chassis at the rear of the body. The operating mechanism is provided in the body, and its execution end is connected to the transmission mechanism. The operating mechanism includes an energy storage unit. An auxiliary opening compression spring is provided in the operating mechanism, and its first end is fixed. After the auxiliary opening compression spring is energy stored in the energy storage unit in the operating mechanism, its second end is connected to the transmission mechanism.

[0007] Preferably, the arc extinguishing chamber is arranged longitudinally, with its static contact side connected to the incoming line and its moving contact side connected to the outgoing line.

[0008] Preferably, the transmission mechanism includes a transmission crank arm, a moving contact insulating pull rod, and a first connecting rod. The transmission crank arm is rotatably connected to the bottom of the main body through a first rotating shaft. One end of the moving contact insulating pull rod is connected to the moving contact in the arc extinguishing chamber, and the other end is connected to the first end of the transmission crank arm. The first end of the first connecting rod is rotatably connected to the second end of the transmission crank arm, and the second end is connected to the operating mechanism.

[0009] Preferably, the operating mechanism also includes a closing transmission unit and an opening transmission unit, the energy storage unit includes an energy storage tension spring, an energy storage motor, an energy storage transmission shaft, and an energy storage transmission shaft crank arm, the closing transmission unit is used to be driven by the energy storage unit to perform the closing operation, the closing transmission unit includes a closing transmission shaft and a closing transmission shaft crank arm, the first end of the closing transmission shaft crank arm is sleeved and fixed on the closing transmission shaft, the second end of the closing transmission shaft crank arm is rotatably connected to the second end of the first connecting rod, the opening transmission unit includes an opening tension spring, the first end of the opening tension spring is connected to the outer shell of the main body, and the second end of the opening tension spring is connected to the bottom of the second end of the transmission crank arm.

[0010] Preferably, a partition plate is longitudinally arranged in the main body to form an independent chamber, and a fixed rod and an auxiliary rotating shaft are transversely arranged in the chamber where the transmission crank arm is located, one end of the fixed rod is transversely fixed to the first side partition plate of the chamber, and the second end of the fixed rod is suspended; the first end of the auxiliary opening pressure spring is connected to the fixed rod.

[0011] Preferably, the auxiliary rotating shaft rotates horizontally on the partition plates on both sides of the chamber, an auxiliary crank arm is fixedly installed on the auxiliary rotating shaft, a first protrusion is provided at the bottom of the outer end of the auxiliary crank arm, and the second end of the auxiliary opening pressure spring is connected to the first protrusion.

[0012] Preferably, the energy storage transmission shaft is rotatably arranged on the partition plate, the energy storage transmission shaft crank arm is installed on the end of the energy storage transmission shaft, a fixed shaft is laterally arranged on the outside of the energy storage transmission shaft crank arm, the first end of the energy storage tension spring is rotatably connected to the partition plate, and the second end of the energy storage tension spring is rotatably connected to the fixed shaft.

[0013] Preferably, the auxiliary crank arm is located in the outer space of the first side of the fixed shaft and the first connecting rod, and a double-station telescopic mechanism is provided on the auxiliary crank arm close to the fixed shaft and the first connecting rod. The double-station telescopic mechanism is telescopically provided with a first telescopic rod and a second telescopic rod. The first telescopic rod is located on the swing path of the fixed shaft. After closing the switch, the energy storage transmission shaft crank arm rotates upward around the energy storage transmission shaft and resets and then extends.

[0014] Preferably, a second protrusion is protruding from the front side wall of the first connecting rod, and a positioning hole is penetrated through the second protrusion. When the fixed shaft drives the auxiliary crank arm to rotate into place, the second telescopic rod is opposite to the positioning hole, and the second telescopic rod is controlled to extend into the positioning hole to lock the position of the auxiliary crank arm, and the first telescopic rod is controlled to reset; when the switch is opened, the second telescopic rod is synchronously controlled to reset, and the second end of the transmission crank arm is pulled upward by the auxiliary opening compression spring.

[0015] Based on the same inventive concept, the present application also provides an intelligent switch cabinet, which has a secondary chamber cabinet door installed on its secondary chamber, including the aforementioned circuit breaker and intelligent device, the intelligent device including an intelligent terminal module and an on-site monitoring module that are communicatively connected to each other, the intelligent terminal module is installed inside the circuit breaker, the intelligent terminal module is used to collect data from the circuit breaker and send it to the on-site monitoring module, receive instructions from the on-site monitoring module to control the chassis vehicle and implement control, the on-site monitoring module is installed on the secondary chamber cabinet door, and is used to connect to the intelligent terminal module to obtain data from the circuit breaker and receive instructions for manual control of the chassis vehicle.

[0016] Compared with the existing technology, this solution has the following advantages: By providing an auxiliary tripping spring to increase the tripping speed, this application improves the circuit breaker's breaking performance. At the same time, the auxiliary tripping spring cleverly stores energy through an energy storage mechanism, eliminating the need for a separate auxiliary tripping energy storage system. This fully utilizes the system's inherent functions, improves system integration, and enhances the mechanical performance of the circuit breaker. Furthermore, the auxiliary tripping spring and drive mechanism do not interfere with the circuit breaker's operating mechanism, ensuring the stability of the circuit breaker's performance. Furthermore, an intelligent terminal module is installed on the switch cabinet to monitor the circuit breaker's status in real time, identify potential hazards early, and predict equipment failure risks, helping customers improve operation and maintenance efficiency and reduce operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of this scheme;

[0018] Figure 2 This is a side view schematic diagram of the energy storage structure of the first embodiment of this solution without the inventive point;

[0019] Figure 3 This is a side view schematic diagram of the internal structure of the circuit breaker without the inventive point in the first embodiment of this solution;

[0020] Figure 4 This is a schematic diagram of the internal structure of the circuit breaker without the invention point in the first embodiment of this solution;

[0021] Figure 5 This is a three-dimensional schematic diagram of the internal structure of the circuit breaker without the inventive point in the first embodiment of this solution;

[0022] Figure 6 This is a three-dimensional schematic diagram of the internal structure of a circuit breaker with an auxiliary opening compression spring installed in accordance with the first embodiment of the present invention;

[0023] Figure 7 This is a three-dimensional schematic diagram of the internal structure of the circuit breaker with the auxiliary opening compression spring and auxiliary crank arm installed in the first embodiment of this solution;

[0024] Figure 8 This is a schematic diagram of the three-dimensional structure of an auxiliary crank arm according to an embodiment of the present invention;

[0025] Among them, 100-body, 110-chassis, 120-partition plate, 121-rotation hole, 200-auxiliary opening pressure spring, 210-fixing rod, 300-arc extinguishing chamber, 310-incoming connection end, 320-outgoing connection end, 410-transmission crank arm, 420-first rotating shaft, 430-fixing plate, 440-first connecting rod, 450-second protrusion, 451-positioning hole, 460-moving contact insulation pull rod, 510-closing transmission Moving shaft crank arm, 520-closing transmission shaft, 600-opening tension spring, 610-fixed shaft, 620-outer shell, 700-energy storage tension spring, 710-energy storage transmission shaft, 720-fixed shaft, 721-extension end, 760-energy storage transmission shaft crank arm, 800-auxiliary rotating shaft, 810-auxiliary crank arm, 811-opening, 820-double-station telescopic mechanism, 821-first telescopic rod, 822-limiting structure, 823-second telescopic rod. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0027] An intelligent circuit breaker for improving contact breaking performance has an electric chassis 110 provided at the bottom of the body 100 to facilitate mobile installation of the circuit breaker trolley; the circuit breaker arc extinguishing chamber 300 is provided on the electric chassis 110 at the rear of the body 100; in this embodiment, the arc extinguishing chamber 300 of the three-phase circuit breaker is arranged longitudinally, with the static contact side of the arc extinguishing chamber 300 connected to the incoming line connection terminal 310, and the moving contact side connected to the outgoing line connection terminal 320.

[0028] The moving and static contacts in the arc extinguishing chamber 300 are closed and opened via a transmission mechanism. Specifically, the circuit breaker's transmission mechanism includes a transmission crank arm 410, a moving contact insulating rod 460, and a first connecting rod 440. The transmission crank arm 410 is a two-piece hollow structure, fixed at both ends by a rotating shaft. A fixed plate 430 is longitudinally provided at the bottom of the body 100. The middle portion of the circuit breaker transmission crank arm 410 is rotatably supported on the fixed plate 430 via a first rotating shaft 420. This allows the circuit breaker transmission crank arm 410 to swing at the bottom of the body 100, performing the closing and opening operations of the moving and static contacts. The first end of the moving contact insulating rod 460 is connected to the moving contact in the arc extinguishing chamber 300, and the second end of the moving contact insulating rod 460 is connected to the first end of the transmission crank arm 410. When the first end of the transmission crank arm 410 swings downward, the circuit breaker is opened; when the first end of the transmission crank arm 410 swings upward, the circuit breaker is closed. The first end of the first connecting rod is rotatably connected to the second end of the transmission crank arm 410. In the prior art, the first connecting rod 440 pushes downward, thereby driving the first end of the transmission crank arm 410 to swing upward, thereby closing the circuit breaker; the opening tension spring 600 pulls the transmission crank arm 410 to open the circuit breaker. In this application, an auxiliary opening compression spring 200 is provided to assist in pulling the first connecting rod 440 upward, thereby increasing the opening speed, reducing the contact arcing time, protecting the contact structure, and further improving the circuit breaker's breaking performance.

[0029] The operating mechanism is disposed in the main body 100, and its execution end is connected to the transmission mechanism of the circuit breaker for performing closing and opening operations. Specifically, the operating mechanism includes an energy storage unit, a closing transmission unit, and an opening transmission unit. The energy storage unit includes an energy storage tension spring 700, an energy storage motor, an energy storage transmission shaft 710, and an energy storage transmission shaft crank arm 760. The closing transmission unit is driven by the energy storage unit to perform the closing operation. The closing transmission unit includes a closing transmission shaft 520 and a closing transmission shaft crank arm 510. The first end of the closing transmission shaft crank arm 510 is sleeved and fixed on the closing transmission shaft 520, and the second end of the closing transmission shaft crank arm 510 is rotatably connected to the second end of the first connecting rod 440. The basic functions of the energy storage unit and the closing transmission unit are similar to those of the prior art and will not be described in detail in the present invention. The trip transmission unit includes a trip tension spring 600, the first end of which is connected to the outer shell 620 of the main body 100, and a fixed shaft 610 is provided between the bottom of the second end of the transmission crank arm 410. The fixed shaft 610 is located between the first rotating shaft 420 and the second end of the circuit breaker transmission crank arm 410. The second end of the trip tension spring 600 is connected to the fixed shaft 610 to provide an upward pulling force for the transmission crank arm 410, thereby driving the circuit breaker to trip.

[0030] The energy storage transmission shaft 710 is rotatably arranged on the partition plate 120, and the energy storage transmission shaft crank arm 760 is installed on the end of the energy storage transmission shaft 710. A fixed shaft 720 is laterally arranged on the outside of the energy storage transmission shaft crank arm 760. The first end of the energy storage tension spring 700 is rotatably connected to the partition plate 120, and the second end of the energy storage tension spring 700 is rotatably connected to the fixed shaft 720. When the energy storage motor drives the energy storage transmission shaft 710 to rotate, and then drives the energy storage transmission shaft crank arm 760 and the fixed shaft 720 to rotate downward, the energy storage tension spring 700 is pulled to store energy, which is used to provide energy for the closing operation.

[0031] The body 100 is longitudinally arranged with multiple partitions 120 to form multiple chambers. The transmission mechanism for each phase of the three-phase circuit breaker is separated into a separate chamber. A fixed rod 210 and an auxiliary rotating shaft 800 are transversely arranged in the chamber where the transmission crank arm 410 is located. One end of the fixed rod 210 is transversely fixed to the first side partition 120 of the chamber, while the second end of the fixed rod 210 is suspended in the air so as not to affect the movement of the circuit breaker transmission crank arm 410. The first end of the auxiliary tripping compression spring 200 is connected to the fixed rod 210, thereby fixing the bottom of the auxiliary tripping compression spring 200.

[0032] The auxiliary rotating shaft 800 rotates horizontally in the rotating hole 121 of the partition plates 120 on both sides of the chamber. An auxiliary crank arm 810 is fixedly installed on the auxiliary rotating shaft 800. The auxiliary crank arm 810 is small at the end near the auxiliary rotating shaft and large at the end far from the auxiliary rotating shaft. A first protrusion is provided at the bottom of the end far from the auxiliary rotating shaft of the auxiliary crank arm 810. A hole is perforated or a fixed shaft is provided on the first protrusion. The second end of the auxiliary opening pressure spring 200 is connected to the first protrusion, thereby realizing the overall connection of the auxiliary opening pressure spring 200. When the auxiliary crank arm 810 rotates downward, the auxiliary opening pressure spring 200 is compressed to realize energy storage, which is used to assist opening and increase the opening speed.

[0033] The auxiliary crank arm 810 is located in the space outside the first side of the fixed shaft 720 and the first connecting rod 440. The auxiliary crank arm 810 is fixedly mounted on the auxiliary rotating shaft 800 through an opening 811 near the center of the auxiliary rotating shaft end. A dual-position telescopic mechanism 820 is provided on the auxiliary crank arm 810 near the side of the fixed shaft 720 and the first connecting rod 440. The dual-position telescopic mechanism 820 is telescopically provided with a first telescopic rod 821 and a second telescopic rod 823. The first telescopic rod 821 is provided with a limiting structure 822 for limiting the fixed shaft 720 on the first telescopic rod 821 when the fixed shaft 720 contacts the first telescopic rod 821.

[0034] The fixed shaft 720 in the second circuit breaker transmission mechanism chamber from the left has the same contact structure as the first telescopic rod 821, and the auxiliary opening operation and process are also consistent. In the prior art, however, the fixed shaft 720 does not exist in the third circuit breaker transmission mechanism chamber from the left. In order to achieve synchronous opening assistance for the third phase circuit breaker from the left, in this application, the fixed shaft 720 in the second circuit breaker transmission mechanism chamber from the left is extended horizontally toward the third circuit breaker transmission mechanism chamber until the extended end 721 extends into the third circuit breaker transmission mechanism chamber from the left. The extended end 721 is used to compress the auxiliary opening compression spring 200 in the third circuit breaker transmission mechanism chamber from the left, replacing the compression effect of the fixed shaft 720.

[0035] The specific working process of this embodiment is as follows:

[0036] The auxiliary crank arm 810 is close to one side of the fixed shaft 720 and the first connecting rod 440. When in the extended state, the first telescopic rod 821 is located on the swing path of the fixed shaft 720. In the normal state, the first telescopic rod 821 remains in the retracted state to avoid affecting the opening process, because when opening the gate, the fixed shaft 720 will rotate upward and outward.

[0037] When the circuit breaker is opened, the auxiliary opening compression spring 200 pushes the auxiliary crank arm 810 to rotate upward around the auxiliary rotating shaft 800 until the auxiliary opening compression spring 200 extends to a normal state. During this process, the auxiliary opening compression spring 200 is used to assist the circuit breaker in opening and increase the opening speed.

[0038] When the switch is closed, the fixed shaft 720 will rotate upward and outward. After the switch is closed, the energy storage transmission shaft crank arm 760 rotates upward around the energy storage transmission shaft 710 and resets. The fixed shaft 720 will rotate upward and outward to a high position. At this time, pushed by the auxiliary opening pressure spring 200, the auxiliary crank arm 810 is also in a high position. After the switch is closed, the energy storage mechanism re-stores energy. At this time, the first telescopic rod 821 is controlled to extend. The first telescopic rod 821 is located on the downward swinging path of the fixed shaft 720. When storing energy, driven by the energy storage motor, the energy storage transmission shaft crank arm 760 rotates downward around the energy storage transmission shaft 710 to stretch the energy storage tension spring. 700 stores energy. At this time, since the first telescopic rod 821 is located on the path of the fixed shaft 720 swinging downward, when the fixed shaft 720 swings downward, the limit is stuck in the limit structure 822. As the switch is closing and the energy is stored, the fixed shaft 720 pushes the first telescopic rod 821 to drive the auxiliary crank arm 810 to rotate downward around the auxiliary rotating shaft 800, compressing the auxiliary opening brake compression spring 200 to store energy until the closing and energy storage process is completed. At this time, the auxiliary opening brake compression spring 200 is also energy stored in place. During this process, the second telescopic rod 823 remains in a retracted state to avoid affecting the swinging process of the auxiliary crank arm 810.

[0039] In the present application, a second protrusion 450 is protruding from the front side wall of the first connecting rod 440, and a positioning hole 451 parallel to the fixed rod 210 is penetrated through the second protrusion 450. When the fixed shaft 720 drives the auxiliary crank arm 810 to rotate downward into position, that is, after the energy storage is completed, the second telescopic rod 823 is facing the positioning hole 451. The second telescopic rod 823 is controlled to extend into the positioning hole 451 to lock the position of the auxiliary crank arm 810 and keep the auxiliary opening pressure spring 200 in the energy storage state. At this time, there is no need to keep the auxiliary opening pressure spring 200 in a compressed state through the fixed shaft 720. The first telescopic rod 821 is controlled to reset to avoid the fixed shaft 720 blocking the auxiliary crank arm 810 from rotating upward to release the auxiliary opening pressure spring 200 when the switch is opened.

[0040] When opening the circuit breaker, when the opening tension spring 600 is controlled to be released, the second telescopic rod 823 is synchronously controlled to be reset, and the auxiliary opening compression spring 200 is synchronously released. The second end of the transmission crank arm 410 of the circuit breaker is pulled upward by the auxiliary opening compression spring 200, that is, the auxiliary opening compression spring 200 and the opening tension spring 600 synchronously pull the opening process, thereby effectively improving the opening speed.

[0041] After the opening is completed, it is necessary to wait for the closing to be completed, control the first telescopic rod 821 to extend, and during the recharging of the energy storage unit, the fixed shaft 720 will re-compress the auxiliary opening compression spring 200 to assist in opening energy storage, and repeat the above process.

[0042] Based on the same inventive concept, the present application also discloses an intelligent switch cabinet, comprising the aforementioned circuit breaker for improving contact breaking performance and an intelligent device to perform intelligent monitoring functions, wherein the intelligent device comprises an intelligent terminal module and an on-site monitoring module. The intelligent terminal module is installed inside the circuit breaker; the intelligent terminal module is connected to a temperature rise sensor to monitor the temperature rise data of the six static contacts; the intelligent terminal module is also connected to a current sensor to monitor the current of the energy storage motor and the opening and closing current of the circuit breaker; the intelligent terminal module is also connected to a displacement sensor to collect data such as the displacement curve of the circuit breaker and calculate the mechanical characteristic parameters of the circuit breaker in real time; the intelligent terminal module receives the operation commands issued by the on-site monitoring module in real time to control the advancement and extension of the chassis 110, and the control of the chassis 110 has a five-protection interlocking function; the intelligent terminal module also uploads data to the on-site monitoring module via an internal protocol. The on-site monitoring module is installed on the door of the secondary chamber of the switch cabinet and is connected to the intelligent terminal module inside the switch cabinet through an internal protocol. The on-site monitoring module includes a touch screen and a human-computer interaction interface, monitors the status data, curve data, temperature rise data, etc. of the aforementioned circuit breaker, and displays and stores relevant data. Users can view and process real-time data and historical data through relevant operations; the on-site monitoring module has event recording and alarm functions; users can also operate the chassis 110 of each switch cabinet through the human-machine interface if they are authorized; the on-site monitoring module also has an RS485 external communication interface, which can be connected to the background system through the Modbus protocol.

[0043] In the description of this specification, the schematic diagrams in the accompanying drawings highlight the main features and key parts of the figures, and appropriately simplify or omit details, and therefore do not represent the proportions and dimensional relationships in reality. The descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in an appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0044] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A circuit breaker for improving contact breaking performance, comprising a body (100), an arc extinguishing chamber (300), an operating mechanism, and a transmission mechanism, wherein an electric chassis (110) is provided at the bottom of the body (100), the arc extinguishing chamber (300) is provided on the electric chassis (110) at the rear of the body (100), the operating mechanism is provided in the body (100), and its execution end is connected to the transmission mechanism, the operating mechanism includes an energy storage unit, and is characterized in that: An auxiliary opening pressure spring (200) is provided in the operating mechanism, the first end of which is fixed; after the auxiliary opening pressure spring (200) stores energy through an energy storage unit in the operating mechanism, the second end of the auxiliary opening pressure spring (200) is connected to the transmission mechanism.

2. The circuit breaker with improved contact breaking performance according to claim 1, characterized in that: The arc extinguishing chamber (300) is arranged longitudinally, with its static contact side connected to the incoming line and its moving contact side connected to the outgoing line.

3. The intelligent circuit breaker for improving contact breaking performance according to claim 2, characterized in that: The transmission mechanism comprises a transmission crank arm (410), a movable contact insulating pull rod (460), and a first connecting rod (440); the transmission crank arm (410) is rotatably connected to the bottom of the body (100) via a first rotating shaft (420); one end of the movable contact insulating pull rod (460) is connected to the movable contact in the arc extinguishing chamber (300), and the other end is connected to the first end of the transmission crank arm (410); the first end of the first connecting rod (440) is rotatably connected to the second end of the transmission crank arm (410), and the second end is connected to the operating mechanism.

4. The circuit breaker with improved contact breaking performance according to claim 1, characterized in that: The operating mechanism further comprises a closing transmission unit and an opening transmission unit, the energy storage unit comprises an energy storage tension spring (700), an energy storage motor, an energy storage transmission shaft (710), and an energy storage transmission shaft crank arm (760), the closing transmission unit is used to be driven by the energy storage unit to perform a closing operation, the closing transmission unit comprises a closing transmission shaft (520), and a closing transmission shaft crank arm (510), the first end of the closing transmission shaft crank arm (510) is sleeved and fixed on the closing transmission shaft (520), the second end of the closing transmission shaft crank arm (510) is rotatably connected to the second end of the first connecting rod (440), the opening transmission unit comprises an opening tension spring (600), the first end of the opening tension spring (600) is connected to the outer shell (620) of the body (100), and the second end of the opening tension spring (600) is connected to the bottom of the second end of the transmission crank arm (410).

5. The circuit breaker with improved contact breaking performance according to claim 4, characterized in that: A partition plate (120) is longitudinally arranged in the body (100) to form an independent chamber, and a fixed rod (210) and an auxiliary rotating shaft (800) are transversely arranged in the chamber where the transmission crank arm (410) is located. One end of the fixed rod (210) is transversely fixed to the first side partition plate (120) of the chamber, and the second end of the fixed rod is suspended in the air; the first end of the auxiliary opening pressure spring (200) is connected to the fixed rod (210).

6. The circuit breaker with improved contact breaking performance according to claim 5, characterized in that: The auxiliary rotating shaft (800) rotates laterally on the partition plates (120) on both sides of the chamber. An auxiliary crank arm (810) is fixedly mounted on the auxiliary rotating shaft (800). A first protrusion is provided at the bottom of the outer end of the auxiliary crank arm (810). The second end of the auxiliary opening pressure spring (200) is connected to the first protrusion.

7. The circuit breaker with improved contact breaking performance according to claim 6, characterized in that: The energy storage transmission shaft (710) is rotatably mounted on a partition plate (120); the energy storage transmission shaft crank arm (510) is mounted on an end of the energy storage transmission shaft (710); a fixed shaft (610) is laterally disposed outside the energy storage transmission shaft crank arm (510); a first end of the energy storage tension spring (700) is rotatably connected to the partition plate (120); and a second end of the energy storage tension spring (700) is rotatably connected to the fixed shaft (610).

8. The circuit breaker with improved contact breaking performance according to claim 7, characterized in that: The auxiliary crank arm (810) is located in the first side outer space of the fixed shaft (610) and the first connecting rod (440); a double-station telescopic mechanism (820) is provided on the auxiliary crank arm (810) close to the fixed shaft (610) and the first connecting rod (440); a first telescopic rod (821) and a second telescopic rod (823) are telescopically provided on the double-station telescopic mechanism (820); the first telescopic rod (821) is located on the swing path of the fixed shaft (610); after closing the switch, the energy storage transmission shaft crank arm (510) rotates upward around the energy storage transmission shaft (710) and resets before extending.

9. The circuit breaker with improved contact breaking performance according to claim 8, characterized in that: A second protrusion (450) is protruded from the front side wall of the first connecting rod (440), and a positioning hole (451) is penetrated through the second protrusion (450). When the fixed shaft (610) drives the auxiliary crank arm (810) to rotate into position, the second telescopic rod (823) is directly opposite the positioning hole, and the second telescopic rod (823) is controlled to extend into the positioning hole to lock the position of the auxiliary crank arm (810), and the first telescopic rod (821) is controlled to reset; when the switch is opened, the second telescopic rod (823) is synchronously controlled to reset, and the second end of the transmission crank arm (410) is pulled upward by the auxiliary switch opening compression spring (200).

10. An intelligent switch cabinet, wherein a secondary chamber door is installed on the secondary chamber, characterized in that: The invention comprises a circuit breaker and an intelligent device according to any one of claims 1 to 9, wherein the intelligent device comprises an intelligent terminal module and an on-site monitoring module that are communicatively connected to each other, the intelligent terminal module is installed inside the circuit breaker, the intelligent terminal module is used to collect data of the circuit breaker and send it to the on-site monitoring module, receive instructions from the on-site monitoring module to control a chassis vehicle (110) and implement control, and the on-site monitoring module is installed on the cabinet door of the secondary chamber and is used to connect to the intelligent terminal module to obtain data of the circuit breaker and receive instructions for manually controlling the chassis vehicle (110).

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