Parallel double-fracture collaborative breaking structure and method of vacuum circuit breaker

Abstract

The invention discloses a parallel double-fracture collaborative breaking structure and method of a vacuum circuit breaker, and belongs to the technical field of circuit breaker structures. The structure comprises a spring operating mechanism, a current sharing mechanism, a transmission mechanism and a double-fracture circuit breaker assembly; the spring operating mechanism is arranged outside a sealed gas box of the gas insulated switchgear, and the spring operating mechanism is connected with the current sharing mechanism and drives the current sharing mechanism to move; the transmission mechanism comprises an upper motion guide rod and a lower motion guide rod, one ends of the upper motion guide rod and the lower motion guide rod are connected with the current sharing mechanism, the other ends are connected with the double-break circuit breaker assembly, and the motion consistency of the transmission mechanism is driven and controlled through the current sharing mechanism; the double-break circuit breaker assembly is connected with the transmission mechanism, and the transmission mechanism drives the double-break circuit breaker assembly to move and is used for switching on and switching off the vacuum circuit breaker switch. According to the invention, the current nonuniformity of the parallel multi-break vacuum circuit breaker in the opening and closing process can be effectively and structurally reduced, and the safety and reliability of power grid operation are improved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breaker structures, and in particular to a parallel double-break coordinated breaking structure and method of a vacuum circuit breaker. Background Art

[0002] With the development and construction of power grids and power stations, the voltage level of my country's power system continues to increase, and the voltage level that switchgear, especially circuit breakers, must adapt to is also increasing. Circuit breakers can normally carry and open and close rated currents, and can also carry and interrupt fault currents (including high short-circuit currents) within specified limits and time limits. They ensure the reliability and safety of electrical equipment such as power grids and generators, and are one of the most important protective devices in the power system. On the one hand, vacuum circuit breakers do not have arc-extinguishing media and do not pose environmental issues, making them a very promising power switch. The development of large-capacity vacuum circuit breakers to replace SF6 circuit breakers is also a development trend. On the other hand, SF6 circuit breakers can only achieve an increase in rated current carrying capacity and breaking capacity through a single break, while vacuum circuit breakers can increase rated current carrying capacity and high-current breaking capabilities by connecting multiple breakers in parallel.

[0003] During normal operation of a multi-break vacuum circuit breaker, the use of multiple vacuum interrupters in parallel can share the larger rated current and increase the capacity of the vacuum switch. When a short-circuit fault occurs, multiple interrupters simultaneously disconnect, cutting off the short-circuit current and ultimately achieving the purpose of interrupting large-capacity current. However, during the multi-break disconnection operation, if the synchronous operation of the contacts of each break cannot be ensured, it may lead to uneven current distribution among the breaks, causing a contact to be subjected to a short-term excessive current, burning the contact and thus affecting the circuit breaker's breaking performance and electrical life. The operating mechanism transmission chain of the general scheme is long, the gaps between the transmission chain links are inconsistent, the synchronicity of the circuit breaker opening and closing is not guaranteed to be high enough, and the size is also large.

[0004] Prior art document 1 (CN116825575A) discloses a double-break vacuum circuit breaker device, belonging to the field of vacuum switch technology. The device includes: a first vacuum interrupter chamber and a second vacuum interrupter chamber, and a transmission module connected to the first vacuum interrupter chamber and the second vacuum interrupter chamber respectively. However, the device relies on the rotation of multiple meshing gears to achieve transmission. After multiple interruptions, the gear loss is large, and the interruption synchronization requires high parts processing. At the same time, multiple components are combined to achieve power transmission, which increases the cumulative error and is not suitable for fast interruption.

[0005] Prior art document 2 (CN206098278U) discloses a double-break vacuum circuit breaker for 66KV, including two break devices with the same structure, each break device is arranged in a vacuum arc chamber, the break device includes a static contact and a moving contact, a vacuum gap is left between the static contact and the moving contact, the tails of the moving contacts on both sides are connected in series through a connecting rod, and the connecting rod is provided with a bidirectional repulsion mechanism and a permanent magnet holding mechanism in sequence; but the synchronicity of the opening and closing between the double breaks depends on the stable linear motion of the connecting rod in the vertical plane. However, since its own opening and closing operating mechanism is an electromagnetic repulsion operating mechanism, the jitter during the breaking process is large, and the invention cannot guarantee the consistency of the one-dimensional movement of the double-break moving contacts. Summary of the Invention

[0006] To address the aforementioned issues with existing technology applications, the present invention provides a parallel dual-break coordinated breaking structure and method for vacuum circuit breakers that features a simple structure, strong current sharing, safety, reliability, and strong synchronization. This structure effectively reduces current unevenness during the opening and closing processes of parallel multi-break vacuum circuit breakers, improving the safety and reliability of power grid operation. The structure can be used in dual-break vacuum circuit breakers for high-voltage gas-insulated switchgear.

[0007] The present invention adopts the following technical solutions.

[0008] A first aspect of the present invention discloses a parallel double-break cooperative breaking structure of a vacuum circuit breaker, comprising: a spring operating mechanism, a current balancing mechanism, a transmission mechanism and a double-break circuit breaker assembly;

[0009] The spring operating mechanism is arranged outside the sealed gas box of the gas insulated switchgear, and is connected to the current balancing mechanism to drive the current balancing mechanism to perform one-dimensional movement and guide the movement of the transmission mechanism;

[0010] The transmission mechanism includes an upper motion guide rod and a lower motion guide rod arranged in parallel, one end of the upper motion guide rod and the lower motion guide rod are connected to the current balancing mechanism, and the other end is connected to the double-break circuit breaker assembly for controlling the consistency of the breaking movement;

[0011] The double-break circuit breaker assembly is located inside the vacuum chamber and is connected to a transmission mechanism. The transmission mechanism drives the double-break circuit breaker assembly to move for opening and closing the vacuum circuit breaker switch.

[0012] Preferably, the double-break circuit breaker assembly includes: an upper circuit breaker shielding chamber, a lower circuit breaker shielding chamber, an upper moving contact, an upper static contact, a lower moving contact and a lower static contact; the upper moving contact and the lower moving contact are located in the upper circuit breaker shielding chamber, and the upper static contact and the lower static contact are located in the lower circuit breaker shielding chamber.

[0013] Preferably, the transmission mechanism also includes an upper lubrication chamber, a lower lubrication chamber, an upper spindle connecting assembly and a lower spindle connecting assembly; one end of the upper motion guide rod and the lower motion guide rod are respectively located inside the upper lubrication chamber and the lower lubrication chamber, and the other end of the upper motion guide rod and the lower motion guide rod are connected to the flow equalizing mechanism through the upper spindle connecting assembly and the lower spindle connecting assembly.

[0014] Preferably, the transmission mechanism further includes an upper moving contact connecting tube and a lower moving contact connecting tube; the upper moving contact connecting tube passes through the upper lubrication cavity and is connected to the upper moving guide rod, and the lower moving contact connecting tube passes through the lower lubrication cavity and is connected to the lower moving guide rod.

[0015] Preferably, the upper moving guide rod and the lower moving guide rod are connected to the upper moving contact and the lower moving contact through an upper moving contact connecting tube and a lower moving contact connecting tube at the end.

[0016] Preferably, the upper lubrication chamber and the lower lubrication chamber are filled with mechanical lubricating fluid to reduce the contact resistance and friction loss of the guide rod movement.

[0017] Preferably, the flow balancing mechanism includes a flow balancing disk; the spring operating mechanism includes an outer arm and an output shaft;

[0018] The outer arm drives the output shaft to move, and the output shaft is connected to the current equalizing disk. The movement of the output shaft drives the current equalizing disk to move left and right in one dimension.

[0019] Preferably, the flow balancing mechanism further comprises a guide plate, an upper guide plate connecting key and a lower guide plate connecting key;

[0020] Two parallel through holes are set in the guide plate, and the upper movement guide rod and the lower movement guide rod pass through the through holes, limiting the guide rods to do one-dimensional parallel movement; the guide plate is connected to the shell through the upper guide plate connecting key and the lower guide plate connecting key to fix the guide plate.

[0021] Preferably, the vacuum chamber includes an upper vacuum chamber and a lower vacuum chamber; the dual-port circuit breaker assembly includes an upper circuit breaker shielding chamber, a lower circuit breaker shielding chamber and a static contact parallel lead-out pole;

[0022] An upper circuit breaker shielding chamber and a lower circuit breaker shielding chamber are respectively arranged in the upper vacuum chamber and the lower vacuum chamber, and the static contact parallel lead-out pole is connected with the upper static contact and the lower static contact.

[0023] A second aspect of the present invention discloses a parallel double-break coordinated breaking method for a vacuum circuit breaker, based on the parallel double-break coordinated breaking structure of a vacuum circuit breaker, comprising the following steps:

[0024] When opening, the external spring operating mechanism receives the opening signal and pulls the current balancing mechanism, which simultaneously drives the upper and lower moving guide rods to pull back synchronously, separating the moving and static contacts of the double-break circuit breaker assembly, completing the opening.

[0025] When closing the circuit breaker, the external spring operating mechanism receives the closing signal and pushes the current balancing mechanism, which simultaneously pushes the upper and lower moving guide rods forward synchronously, so that the moving contacts and static contacts of the double-break circuit breaker assembly merge to complete the closing.

[0026] Compared with the prior art, the beneficial effects of the present invention include at least:

[0027] 1. The structure designed by the present invention can be better adapted to the requirements of opening and closing under large capacity (high voltage and high current), especially the generator circuit breaker at the outlet of the pumped storage power station. The opening method of the present invention can be adopted for multiple breaks in parallel or in series, which can not only improve the flow capacity of the break, but also improve the strong current sharing ability during the opening and closing process, and realize the consistency and synchronicity of the opening and closing process. The breaking structure is simple, safe and reliable, and the cost is low.

[0028] 2. In the present invention, the spring operating mechanism drives the inner movement of the moving guide rod by pushing and pulling the equalizing current disk, and realizes the opening and closing operation of the vacuum interrupter by connecting two parallel moving contacts. The two moving guide rods are guided by a fixed guide disk and can only perform one-dimensional motion in a planar direction. The other two moving guide rods are fixedly connected to the equalizing current disk to achieve consistent motion of the two guide rods. This method not only improves the motion of the operating mechanism, but also enhances the consistency of its transmission mode. The operating mechanism can achieve efficient one-dimensional motion and synchronization during the disconnection process, with a simple structure, high reliability, and resistance to damage.

[0029] 3. The parallel double-break cooperative breaking structure of the present invention is provided with a static contact parallel lead-out pole at the static contact, which can expand the present invention and realize the rapid opening and closing function of the operating mechanism. It has good scalability, simplifies the product structure, and is conducive to the long-term stable operation of the vacuum circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The invention proposes a parallel double-break cooperative breaking structure for a vacuum circuit breaker;

[0031] In the figure: 1. Static contact parallel lead-out pole; 2. Housing; 22. Output shaft; 10. Spring operating mechanism; 11. Outer arm; 3. Upper lubrication chamber; 4. Lower lubrication chamber; 33. Double-break circuit breaker assembly; 33a. Upper circuit breaker shielding chamber; 33b. Lower circuit breaker shielding chamber; 59. Current balancing plate; 7a. Upper moving contact connecting pipe; 7b. Lower moving contact connecting pipe; 72a. Upper vacuum chamber; 72b. Lower vacuum chamber; 77. Upper moving guide rod; 78. Lower moving guide rod; 60. Upper spindle connecting assembly; 61. Lower spindle connecting assembly; 59. Current balancing device includes current balancing plate; 80. Guide plate; 88. Upper guide plate connecting key; 89. Lower guide plate connecting key; 101a. Upper moving contact; 99a. Upper static contact 99a; 101b. Lower moving contact; 99b. Lower static contact. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0034] like Figure 1 As shown, embodiment 1 of the present invention discloses a parallel double-break cooperative breaking structure of a vacuum circuit breaker, including a spring operating mechanism 10, a current balancing mechanism, a transmission mechanism, a housing 2, a vacuum chamber and a double-break circuit breaker assembly.

[0035] The spring operating mechanism 10 is a structure in the prior art, including an outer inflection arm 11 and an output shaft 22. Here, the transmission mechanism movement is only led out through the outer inflection arm 11 and the output shaft 22, so the structure of the spring operating mechanism 10 is not described in detail.

[0036] The transmission mechanism includes an upper motion guide rod 77, a lower motion guide rod 78, an upper spindle connecting assembly 60, a lower spindle connecting assembly 61, an upper lubrication chamber 3, a lower lubrication chamber 4, an upper moving contact connecting tube 7a and a lower moving contact connecting tube 7b;

[0037] One end of the upper moving guide rod 77 and the lower moving guide rod 78 are located inside the upper lubrication chamber 3 and the lower lubrication chamber 4 respectively, and the upper moving contact connecting tube 7a passes through the upper lubrication chamber 3 and is connected to the upper moving guide rod 77, while the lower moving contact connecting tube 7b passes through the lower lubrication chamber and is connected to the lower moving guide rod 78;

[0038] The other ends of the upper motion guide rod 77 and the lower motion guide rod 78 are connected to the flow balancing mechanism through the upper spindle connecting assembly 60 and the lower spindle connecting assembly 61 .

[0039] The flow balancing mechanism includes a flow balancing plate 59, a guide plate 80, an upper guide plate connecting key 88 and a lower guide plate connecting key 89;

[0040] The spring operating mechanism 10 is arranged outside the sealed air box of the gas insulated switchgear, wherein the output shaft 22 is driven to move by the outer crank arm 11. The output shaft 22 is connected to the current equalizing disk 59. The movement of the output shaft 22 drives the current equalizing disk 59 to move left and right in one dimension. Its movement is restricted by the upper movement guide rod 77 and the lower movement guide rod 78.

[0041] Specifically, the upper motion guide rod 77 and the lower motion guide rod 78 are connected to the flow balancing plate 59 through the upper spindle connecting assembly 60 and the lower spindle connecting assembly 61 .

[0042] Two parallel through holes are set in the guide plate 80, which are just large enough for the upper motion guide rod 77 and the lower motion guide rod 78 to pass through. The dimensional tolerance is required to be as small as possible. The guide plate 80 is connected to the outer shell 2 through the upper guide plate connecting key 88 and the lower guide plate connecting key 89, and the guide plate 80 is firmly fixed to guide the upper motion guide rod 77 and the lower motion guide rod 78 to move left and right, limiting them to one-dimensional parallel movement. In addition, the upper motion guide rod 77 and the lower motion guide rod 78 are connected to the upper spindle connecting assembly 60 and the lower spindle connecting assembly 61, and the mechanical work of the output shaft 22 of the transmission operating mechanism 10 is used to guide the upper motion guide rod 77 and the lower motion guide rod 78 to move in coordination.

[0043] The vacuum chamber includes an upper vacuum chamber 72a and a lower vacuum chamber 72b; the dual-port circuit breaker assembly includes an upper circuit breaker shielding chamber 33a, a lower circuit breaker shielding chamber 33b, an upper moving contact 101a, an upper static contact 99a, a lower moving contact 101b, a lower static contact 99b and a static contact parallel lead-out pole 1;

[0044] The upper moving guide rod 77 and the lower moving guide rod 78 are connected to the upper moving contact 101a and the lower moving contact 101b through the upper moving contact connecting tube 7a and the lower moving contact connecting tube 7b at the end. The connection adopts an embedded method, and the contacts are replaceable. The upper lubrication chamber 3 and the lower lubrication chamber 4 are filled with mechanical lubricating fluid to reduce the contact resistance and friction loss of the guide rod movement.

[0045] Upper and lower circuit breaker shield chambers 33a and 33b are located within upper and lower vacuum chambers 72a and 72b, respectively. These shield chambers are constructed of high-quality mesh insulation material to prevent particles from being pulled out. These shield chambers contain an upper moving contact 101a, an upper stationary contact 99a, a lower moving contact 101b, and a lower stationary contact 99b, which function as disconnectors.

[0046] In addition, two lead-out metal electrodes or lead-out wires should be provided in the parallel lead-out pole 1 of the static contact. The traditional lead-out scheme is adopted, which does not belong to the scope of the present invention and will not be described in detail here.

[0047] In a preferred but non-limiting embodiment of the present invention, a metal lead-out electrode is provided on the outside of the static contact. If it is connected to other electrodes as the current outflow electrode, and the moving contact is the current inflow electrode, this is a multi-break parallel connection. If the static contact is not connected to other electrodes, one moving contact is the current inflow electrode, and the other is the current outflow electrode, this is a multi-break series connection. Whether the multi-break parallel connection or the multi-break series connection is applicable, the breaking structure of the present invention can be used.

[0048] The working principle of the present invention is as follows:

[0049] When there is a need for opening and closing the circuit breaker, the spring operating mechanism 10 drives the outer arm 11 and the output shaft 22 to move according to the demand, and the output shaft 22 drives the current equalizing plate 59 connected thereto to move. When the upper moving guide rod 77 and the lower moving guide rod 78 are in non-cooperative motion, the current equalizing plate 59 is stuck by the guide plate 80 and cannot move. Only when the upper moving guide rod 77 and the lower moving guide rod 78 simultaneously make a horizontal one-dimensional motion can the current equalizing plate 59 drive the guide rod to move well, thereby separating or merging the upper moving contact 101a and the lower moving contact 101b to the upper static contact 99a and the lower moving contact 101b, and finally realizing the opening and closing operation. The double break during the opening process can achieve good synchronous operation and synchronous opening and closing functions, can efficiently complete parallel current equalization, and realize large-capacity fault or rated opening of the vacuum circuit breaker.

[0050] Embodiment 2 of the present invention discloses a parallel double-break coordinated breaking method for a vacuum circuit breaker, comprising the following steps:

[0051] When opening the circuit breaker, the external spring operating mechanism 10 receives the opening signal, and the outer crank arm 11 drives the output shaft 22 to pull the current equalizing plate 59. The current equalizing plate 59 simultaneously drives the upper moving guide rod 77 and the lower moving guide rod 78 to pull back synchronously, thereby separating the upper moving contact 101a and the lower moving contact 101b from the corresponding static contacts, completing the opening of the circuit breaker.

[0052] It is worth noting that when the upper moving guide rod 77 and the lower moving guide rod 78 are in non-cooperative motion, the flow balancing plate 59 is stuck by the guide plate 80 and cannot move. Only when the upper moving guide rod 77 and the lower moving guide rod 78 perform one-dimensional lateral motion at the same time can the flow balancing plate 59 drive the guide rod to move well.

[0053] When closing the circuit breaker, the external spring operating mechanism 10 receives the closing signal, and the outer crank arm 11 drives the output shaft 22 to push the current equalizing disk 59. The current equalizing disk 59 simultaneously pushes the upper moving guide rod 77 and the lower moving guide rod 78 to advance synchronously, thereby merging the upper moving contact 101a and the lower moving contact 101b with the corresponding static contacts to complete the closing of the circuit breaker.

[0054] Compared with the prior art, the beneficial effects of the present invention include at least:

[0055] 1. The structure designed by the present invention can be better adapted to the requirements of opening and closing under large capacity (high voltage and high current), especially the generator circuit breaker at the outlet of the pumped storage power station. The opening method of the present invention can be adopted for multiple breaks in parallel or in series, which can not only improve the flow capacity of the break, but also improve the strong current sharing ability during the opening and closing process, and realize the consistency and synchronicity of the opening and closing process. The breaking structure is simple, safe and reliable, and the cost is low.

[0056] 2. In the present invention, the spring operating mechanism drives the inner movement of the moving guide rod by pushing and pulling the equalizing current disk, and realizes the opening and closing operation of the vacuum interrupter by connecting two parallel moving contacts. The two moving guide rods are guided by a fixed guide disk and can only perform one-dimensional motion in a planar direction. The other two moving guide rods are fixedly connected to the equalizing current disk to achieve consistent motion of the two guide rods. This method not only improves the motion of the operating mechanism, but also enhances the consistency of its transmission mode. The operating mechanism can achieve efficient one-dimensional motion and synchronization during the disconnection process, with a simple structure, high reliability, and resistance to damage.

[0057] 3. The parallel double-break cooperative breaking structure of the present invention is provided with a static contact parallel lead-out pole at the static contact, which can expand the present invention and realize the rapid opening and closing function of the operating mechanism. It has good scalability, simplifies the product structure, and is conducive to the long-term stable operation of the vacuum circuit breaker.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A parallel double-break coordinated breaking structure of a vacuum circuit breaker, characterized in that: include: A spring operating mechanism (10), a current balancing mechanism, a transmission mechanism and a double-break circuit breaker assembly; The spring operating mechanism (10) is arranged outside the sealed gas box of the gas-insulated switchgear, and the spring operating mechanism (10) is connected to the current balancing mechanism and is used to drive the current balancing mechanism to move; The transmission mechanism includes an upper motion guide rod (77) and a lower motion guide rod (78) arranged in parallel, one end of the upper motion guide rod (77) and the lower motion guide rod (78) being connected to the current balancing mechanism, and the other end being connected to the double-break circuit breaker assembly, and the transmission mechanism is driven by the current balancing mechanism and the motion consistency of the transmission mechanism is controlled; The double-break circuit breaker assembly is located inside the vacuum chamber and is connected to a transmission mechanism. The transmission mechanism drives the double-break circuit breaker assembly to move for opening and closing the vacuum circuit breaker switch.

2. The parallel double-break coordinated breaking structure of a vacuum circuit breaker according to claim 1, characterized in that: The double-break circuit breaker assembly comprises: an upper circuit breaker shielding chamber (33a), a lower circuit breaker shielding chamber (33b), an upper moving contact (101a), an upper static contact (99a), a lower moving contact (101b), and a lower static contact (99b); the upper moving contact (101a) and the lower moving contact (101b) are located in the upper circuit breaker shielding chamber (33a), and the upper static contact (99a) and the lower static contact (99b) are located in the lower circuit breaker shielding chamber (33b).

3. The parallel double-break coordinated breaking structure of a vacuum circuit breaker according to claim 1, characterized in that: The transmission mechanism further comprises: an upper lubrication chamber (3), a lower lubrication chamber (4), an upper spindle connection assembly (60) and a lower spindle connection assembly (61); one end of the upper motion guide rod (77) and the lower motion guide rod (78) are respectively located inside the upper lubrication chamber (3) and the lower lubrication chamber (4), and the other ends of the upper motion guide rod (77) and the lower motion guide rod (78) are connected to the flow balancing mechanism through the upper spindle connection assembly (60) and the lower spindle connection assembly (61).

4. The parallel double-break coordinated breaking structure of a vacuum circuit breaker according to claim 3, characterized in that: The transmission mechanism further comprises: an upper moving contact connecting tube (7a) and a lower moving contact connecting tube (7b); the upper moving contact connecting tube (7a) passes through the upper lubrication cavity (3) and is connected to the upper moving guide rod (77), and the lower moving contact connecting tube (7b) passes through the lower lubrication cavity and is connected to the lower moving guide rod (78).

5. The parallel double-break coordinated breaking structure of a vacuum circuit breaker according to claim 4, characterized in that: The upper moving guide rod (77) and the lower moving guide rod (78) are connected to the upper moving contact (101a) and the lower moving contact (101b) via the upper moving contact connecting tube (7a) and the lower moving contact connecting tube (7b) at the end.

6. The parallel double-break coordinated breaking structure of a vacuum circuit breaker according to claim 3, characterized in that: The upper lubrication chamber (3) and the lower lubrication chamber (4) are filled with mechanical lubricating fluid for reducing the contact resistance and friction loss of the guide rod movement.

7. The parallel double-break coordinated breaking structure of a vacuum circuit breaker according to claim 1, characterized in that: The flow balancing mechanism includes a flow balancing disk (59); the spring operating mechanism (10) includes an outer crank arm (11) and an output shaft (22); The outer turning arm (11) drives the output shaft (22) to move. The output shaft (22) is connected to the flow balancing disk (59). The movement of the output shaft (22) drives the flow balancing disk (59) to do a one-dimensional left-right movement.

8. The parallel double-break coordinated breaking structure of a vacuum circuit breaker according to claim 1, characterized in that: The flow balancing mechanism further comprises: a guide plate (80), an upper guide plate connecting key (88) and a lower guide plate connecting key (89); Two parallel through holes are provided in the guide plate (80), and an upper motion guide rod (77) and a lower motion guide rod (78) pass through the through holes, so as to restrict the guide rods from performing one-dimensional parallel motion; the guide plate (80) is connected to the housing (2) via an upper guide plate connecting key (88) and a lower guide plate connecting key (89), so as to fix the guide plate (80).

9. The parallel double-break coordinated breaking structure of a vacuum circuit breaker according to claim 2, characterized in that: The vacuum chamber comprises: an upper vacuum chamber (72a) and a lower vacuum chamber (72b); the dual-port circuit breaker assembly comprises: an upper circuit breaker shielding chamber (33a), a lower circuit breaker shielding chamber (33b) and a static contact parallel lead-out pole (1); An upper circuit breaker shielding chamber (33a) and a lower circuit breaker shielding chamber (33b) are respectively provided in the upper vacuum chamber (72a) and the lower vacuum chamber (72b), and the static contact parallel lead-out pole (1) is connected to the upper static contact (99a) and the lower static contact (99b).

10. A parallel double-break coordinated breaking method for a vacuum circuit breaker, based on a parallel double-break coordinated breaking structure for a vacuum circuit breaker according to any one of claims 1 to 9, characterized in that: The following steps are involved: When the circuit breaker is opened, the external spring operating mechanism (10) receives the opening signal and pulls the current balancing mechanism, which simultaneously drives the upper moving guide rod (77) and the lower moving guide rod (78) to pull back synchronously, so that the moving contact and the static contact of the double-break circuit breaker assembly are separated, completing the opening; When closing the circuit breaker, the external spring operating mechanism (10) receives the closing signal and pushes the current balancing mechanism, which simultaneously pushes the upper moving guide rod (77) and the lower moving guide rod (78) to advance synchronously, so that the moving contact and the static contact of the double-break circuit breaker assembly merge to complete the closing of the circuit breaker.

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