Transmission system of double-break vacuum circuit breaker

Abstract

The utility model discloses a transmission system of double-break vacuum circuit breaker, include: jar body subassembly, jar body subassembly is equipped with the cavity, transmission case, be located in the cavity, transmission case is equipped with two along the left and right direction opposite sliding setting dynamic end electrically conductive piece, insulating pull rod, along vertical direction and be equipped with jar body subassembly, insulating pull rod's upper end extends to transmission case, two swing arms, about the axial symmetry distribution of insulating pull rod in transmission case, swing arm's one end rotationally connected in transmission case, swing arm's other end with corresponding dynamic end electrically conductive piece swing joint, two first connecting rods, about the axial symmetry distribution of insulating pull rod in transmission case, first connecting rod's one end is pivoted in insulating pull rod's upper end, and the other end rotationally connected in corresponding swing arm's middle part. Under the premise of using dry air as insulating medium, can with the shorter stroke of insulating pull rod to realize two dynamic end electrically conductive piece's greater stroke and improve the opening and closing speed, satisfy the requirement of arc extinguishing performance.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a transmission system for a double-break vacuum circuit breaker. Background Technology

[0002] High-voltage vacuum circuit breakers are critical protection devices in power systems, and their performance directly affects the reliability of power grid operation. With the development of transmission and distribution voltage levels towards 252kV and above, traditional single-break vacuum circuit breakers are limited by the withstand voltage level of the arc-extinguishing chamber, resulting in insufficient breaking capacity and limited insulation recovery characteristics. Therefore, double-break series structures, through voltage equalization design, can significantly improve the overall withstand voltage capacity and have become the preferred solution for high-voltage circuit breakers. High-voltage circuit breakers typically use sulfur hexafluoride as the insulating medium; however, for environmental considerations, existing technologies also include vacuum circuit breakers utilizing dry air insulation combined with vacuum breaking technology.

[0003] The arc-extinguishing performance of dry air is far inferior to that of sulfur hexafluoride gas. Therefore, vacuum circuit breakers need greater opening and closing power and faster opening and closing speeds to address the poor arc-extinguishing performance of dry air. Currently, the transmission structure of high-voltage vacuum circuit breakers utilizes an insulating rod that moves up and down via two Y-shaped connecting rods to link two moving-end conductive components, causing them to move in opposite directions or towards each other horizontally. The insulating rod needs to move a considerable distance to meet the opening and closing stroke requirements, resulting in slow opening and closing speeds and consequently reducing the service life of the vacuum circuit breaker. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the purpose of this invention is to propose a transmission system for a double-break vacuum circuit breaker that, using dry air as the insulating medium, achieves a larger stroke for the two moving-end conductive parts with a shorter stroke of the insulating rod, thereby increasing the opening and closing speed and meeting the requirements for arc extinguishing performance.

[0005] A transmission system for a double-break vacuum circuit breaker according to an embodiment of the present invention includes: a tank assembly having a cavity; a transmission box disposed within the cavity, the transmission box having two movable conductive elements slidably arranged opposite each other in a left-right direction; an insulating pull rod passing through the tank assembly in a vertical direction, the upper end of the insulating pull rod extending into the transmission box; two swing arms symmetrically distributed in the transmission box about the axial direction of the insulating pull rod, one end of each swing arm being rotatably connected to the transmission box, and the other end of each swing arm being movably connected to the corresponding movable conductive element; and two first connecting rods symmetrically distributed in the transmission box about the axial direction of the insulating pull rod, one end of each first connecting rod being pivotally connected to the upper end of the insulating pull rod, and the other end being rotatably connected to the middle of the corresponding swing arm.

[0006] The transmission system of a double-break vacuum circuit breaker according to an embodiment of the present invention has at least the following beneficial effects:

[0007] In the transmission system of the double-break vacuum circuit breaker with the above structure, when the insulating pull rod moves up and down, the two first connecting rods are linked together to retract or open with each other. The two first connecting rods drive the two swing arms to generate a large angular displacement, thereby causing the moving end conductive parts connected to the free end of the swing arms to move in opposite directions or with a large stroke. Under the premise of using dry air as the insulating medium, the larger stroke of the two moving end conductive parts can be achieved with a shorter stroke of the insulating pull rod, thereby improving the opening and closing speed and meeting the requirements of arc extinguishing performance.

[0008] In some embodiments of this utility model, a second connecting rod is rotatably connected to the end of the swing arm, and the end of the second connecting rod away from the swing arm is rotatably connected to the corresponding moving end conductive element.

[0009] In some embodiments of this utility model, both the first connecting rod and the second connecting rod are strip-shaped plates. The swing arm includes two first long strips sandwiched between the two side walls of the second connecting rod. The upper ends of the two first long strips are coaxially pivotally connected to the end of the second connecting rod, and the lower ends of the two first long strips are coaxially pivotally connected to the transmission box. The lower ends of the two first connecting rods are coaxially pivotally connected to the upper end of the insulating pull rod. The upper end of one first connecting rod is pivotally connected between the corresponding two first long strips. The other first connecting rod includes two second long strips. The lower ends of the two second long strips are coaxially arranged, and the upper ends of the two second long strips are coaxially pivotally connected to the outer side walls of the corresponding two first long strips.

[0010] In some embodiments of this utility model, the thickness of the first connecting rod located between the two first long strips is consistent with the distance between the two first long strips, and the thickness of the swing arm located between the two second long strips is consistent with the distance between the two second long strips.

[0011] In some embodiments of this utility model, the cavity is provided with two vacuum interrupting chambers that correspond one-to-one with the two moving end conductive elements. The vacuum interrupting chamber is provided with a stationary end conductive element that cooperates with the moving end conductive element. One end of the moving end conductive element extends along the transmission box into the vacuum interrupting chamber, and the other end of the moving end conductive element is connected to the second connecting rod through a horizontally arranged overtravel spring assembly.

[0012] In some embodiments of this utility model, the overtravel spring assembly includes a spring sleeve rotatably connected to the second connecting rod, the moving end conductive element has a guide rod telescopically disposed within the spring sleeve, and a compression spring is provided between the guide rod and the spring sleeve.

[0013] In some embodiments of this utility model, the lower end of the tank assembly is provided with a first mounting plate, and the lower end of the transmission box is provided with a second mounting plate located above the first mounting plate. The first mounting plate and the second mounting plate are respectively provided with a first mounting hole and a second mounting hole for the insulating pull rod to pass through in the vertical direction. An insulating support cylinder is provided between the first mounting plate and the second mounting plate and sleeved on the outside of the insulating pull rod. Dynamic sealing components are provided between the insulating pull rod and the first mounting hole and between the insulating pull rod and the second mounting hole. The internal space of the transmission box constitutes a low-pressure air chamber, and the part of the cavity outside the transmission box constitutes a high-pressure air chamber.

[0014] In some embodiments of this utility model, the dynamic sealing assembly includes a sleeve body fixedly installed in the first mounting hole or the second mounting hole, the insulating pull rod passes through the middle of the sleeve body, and a V-shaped overlapping sealing assembly and two dustproof sealing rings respectively located above and below the V-shaped overlapping sealing assembly are provided between the inner peripheral wall of the sleeve body and the outer peripheral wall of the insulating pull rod.

[0015] In some embodiments of this utility model, the sleeve body is provided with a stop step that protrudes radially therefrom, and the external thread of the sleeve body is connected to a locking nut opposite to the stop step. The locking nut and the stop step define a clamping space for clamping and fixing the first mounting plate or the second mounting plate.

[0016] In some embodiments of this utility model, the sleeve body has an annular groove with an upward opening, an annular guide sleeve is provided at the bottom of the annular groove, and an O-ring is provided on the inner and outer peripheral walls of the annular guide sleeve. The V-shaped overlapping sealing assembly is located in the annular groove and abuts against the upper end of the annular guide sleeve. The sleeve body is threadedly connected to a pressure sleeve at the opening of the annular groove, which abuts the V-shaped overlapping sealing assembly and the annular guide sleeve against the bottom of the annular groove.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the transmission system of a dual-break vacuum circuit breaker according to an embodiment of the present invention.

[0020] Figure 2 for Figure 1 A cross-sectional schematic diagram of an embodiment;

[0021] Figure 3 for Figure 2 A partially enlarged schematic diagram of part A;

[0022] Figure 4 A partial structural schematic diagram of an embodiment combining an insulating tie rod, a swing arm, a first connecting rod, and a second connecting rod;

[0023] Figure 5 A schematic diagram of the structure in which the dynamic sealing assembly is located on the first long strip plate;

[0024] Figure 6 for Figure 5 A magnified view of part B.

[0025] Figure label:

[0026] Tank assembly 100; cavity 110; first mounting plate 120; transmission box 200; second mounting plate 210; insulating support cylinder 220; vacuum interrupter 300; moving end conductive component 310; stationary end conductive component 320; insulating pull rod 400; swing arm 510; first long strip plate 511; first connecting rod 520; second long strip plate 521; second connecting rod 530; overtravel spring assembly 600; spring sleeve 610; guide rod 620; compression spring 630; dynamic sealing assembly 700; sleeve body 710; stop step 711; V-shaped overlapping sealing assembly 720; dustproof sealing ring 730; locking nut 740; annular guide sleeve 750; O-ring seal 760; pressure sleeve 770. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] See Figures 1 to 3 The present invention discloses a transmission system for a double-break vacuum circuit breaker, comprising: a tank assembly 100, wherein the tank assembly 100 has a cavity 110; a transmission box 200 disposed within the cavity 110, wherein the transmission box 200 has two moving-end conductive elements 310 slidably arranged opposite each other in the left-right direction; an insulating pull rod 400 passing vertically through the tank assembly 100, wherein the upper end of the insulating pull rod 400 extends into the transmission box 200; and two swing arms 510, which are related to the... The insulating pull rods 400 are symmetrically distributed axially within the transmission box 200. One end of the swing arm 510 is rotatably connected to the transmission box 200, and the other end of the swing arm 510 is movably connected to the corresponding moving end conductive element 310. Two first connecting rods 520 are symmetrically distributed axially with respect to the insulating pull rods 400 within the transmission box 200. One end of the first connecting rod 520 is pivotally connected to the upper end of the insulating pull rod 400, and the other end is rotatably connected to the middle part of the corresponding swing arm 510.

[0032] In the transmission system of the double-break vacuum circuit breaker with the above structure, when the insulating pull rod 400 moves up and down, the two first connecting rods 520 are linked together to retract or open. Since the first connecting rod 520 is rotatably connected to the middle of the swing arm 510, the rotation of the first connecting rod 520 can drive the swing arm 510 to produce a large angular displacement, thereby enabling the two moving end conductive parts 310 connected to the swing arm 510 to form a large stroke of opposite or opposite movement. Under the premise of using dry air as the insulating medium, the large stroke of the two moving end conductive parts 310 can be achieved with a short stroke of the insulating pull rod 400, which effectively improves the opening and closing speed, especially meeting the arc extinguishing performance requirements of power transmission and distribution voltage levels of 252kV and above.

[0033] See Figure 2 and Figure 3 In some embodiments of this utility model, a second connecting rod 530 is rotatably connected to the end of the swing arm 510, and the end of the second connecting rod 530 away from the swing arm 510 is rotatably connected to the corresponding moving end conductive member 310. It can be understood that when the ends of the two swing arms 510 produce an arc swing, the second connecting rod 530 can switch the arc swing of the swing arm 510 to push the moving end conductive member 310 to slide in the left-right direction, which helps to improve the movement accuracy and reliability of the moving end conductive member 310, thereby ensuring that the double-break vacuum circuit breaker can normally extinguish the arc or make normal contact and conduct electricity.

[0034] It is conceivable that, without the second link 530, in order to transmit the arc swing of the swing arm 510 to the horizontal movement of the moving end conductive member 310, an oblong hole extending along the length direction of the swing arm 510 could be provided at the end of the swing arm 510, and a guide post passing through the oblong hole could be provided on the moving end conductive member 310. However, compared with the structure with the second link 530, the working reliability of the guide post and the oblong hole is lower and the service life is also lower.

[0035] See Figure 3 and Figure 4In some embodiments of this utility model, in order to further improve the mechanical strength and reliability of the transmission part and extend its service life, the first connecting rod 520 and the second connecting rod 530 are both strip-shaped plates. The swing arm 510 includes two first long strip plates 511 sandwiched between the two side walls of the second connecting rod 530. The upper ends of the two first long strip plates 511 are coaxially pivotally connected to the end of the second connecting rod 530, and the lower ends of the two first long strip plates 511 are coaxially pivotally connected to the transmission box 200. The lower ends of the two first connecting rods 520 are coaxially pivotally connected to the upper end of the insulating pull rod 400. The upper end of one first connecting rod 520 is pivotally connected between the corresponding two first long strip plates 511. The other first connecting rod 520 includes two second long strip plates 521. The lower ends of the two second long strip plates 521 are coaxially arranged, and the upper ends of the two second long strip plates 521 are respectively coaxially pivotally connected to the outer side walls of the corresponding two first long strip plates 511.

[0036] See Figure 4 In some embodiments of this utility model, the thickness of the first connecting rod 520 located between the two first elongated plates 511 is consistent with the distance between the two first elongated plates 511, and the thickness of the swing arm 510 located between the two second elongated plates 521 is consistent with the distance between the two second elongated plates 521. This structure prevents movement along the pivot direction between the two components; the first connecting rod 520 and the swing arm 510 can only rotate relative to each other, further improving the stability and reliability of the transmission.

[0037] See Figure 2 and Figure 3 In some embodiments of this utility model, the cavity 110 is provided with two vacuum interrupting chambers 300 respectively corresponding to the two moving end conductive elements 310. The vacuum interrupting chamber 300 is provided with a stationary end conductive element 320 that cooperates with the moving end conductive element 310. One end of the moving end conductive element 310 extends along the transmission box 200 into the vacuum interrupting chamber 300, and the other end of the moving end conductive element 310 is connected to the second connecting rod 530 through a horizontally arranged overtravel spring assembly 600. It should be noted that when the insulating pull rod 400 moves upward, the angle between the two first connecting rods 520 increases, the two swing arms 510 swing away from each other, and the two second connecting rods 530 respectively drive the corresponding moving end conductive parts 310 to move toward the corresponding stationary end conductive parts 320. After the moving end conductive part 310 contacts the stationary end conductive part 320, the two second connecting rods 530 continue to move away from each other for a certain distance. The overtravel spring assembly 600 generates elastic deformation, so that the moving end conductive part 310 and the stationary end conductive part 320 maintain elastic contact, ensuring the reliability of the conductive contact.

[0038] See Figure 3 In some embodiments of this utility model, the overtravel spring assembly 600 includes a spring sleeve 610 rotatably connected to the second connecting rod 530. The moving end conductive member 310 has a guide rod 620 telescopically disposed within the spring sleeve 610, and a compression spring 630 is provided between the guide rod 620 and the spring sleeve 610. Specifically, when the insulating pull rod 400 moves upward, the angle between the two first connecting rods 520 increases, the two swing arms 510 swing away from each other, and the two second connecting rods 530 push the two spring sleeves 610 to slide in opposite directions in the left and right directions. After the moving end conductive member 310 contacts the stationary end conductive member 320, the two spring sleeves 610 continue to move away from each other for a certain distance, and the compression spring 630 is compressed to a shorter length.

[0039] It should be noted that when using high-pressure dry air instead of traditional sulfur hexafluoride gas, the internal pressure requirements of the high-pressure chamber are higher; therefore, the requirements for airtightness are correspondingly higher. See also Figure 2 , Figure 5 and Figure 6 In some embodiments of this utility model, the lower end of the tank assembly 100 is provided with a first mounting plate 120, and the lower end of the transmission box 200 is provided with a second mounting plate 210 located above the first mounting plate 120. The first mounting plate 120 and the second mounting plate 210 are respectively provided with a first mounting hole and a second mounting hole for the insulating pull rod 400 to pass through in the vertical direction. An insulating support cylinder 220 is provided between the first mounting plate 120 and the second mounting plate 210 and sleeved on the outside of the insulating pull rod 400. A dynamic sealing assembly 700 is provided between the insulating pull rod 400 and the first mounting hole and between the insulating pull rod 400 and the second mounting hole. The internal space of the transmission box 200 forms a low-pressure air chamber, and the part of the cavity 110 outside the transmission box 200 forms a high-pressure air chamber.

[0040] See Figure 6In some embodiments of this utility model, the dynamic sealing assembly 700 includes a sleeve body 710 fixedly installed in the first mounting hole or the second mounting hole, the insulating pull rod 400 passes through the middle of the sleeve body 710, and a V-shaped overlapping sealing assembly 720 and two dustproof sealing rings 730 respectively located above and below the V-shaped overlapping sealing assembly 720 are provided between the inner peripheral wall of the sleeve body 710 and the outer peripheral wall of the insulating pull rod 400. Understandably, the two dustproof sealing rings 730 located at the upper and lower ends of the sleeve body 710 are used to block external contaminants adhering to the surface of the insulating tie rod 400. The V-shaped overlapping sealing assembly 720 has at least two stacked V-shaped sealing rings. Under pressure, the V-shaped sealing rings can adjust the lip state and increase the contact pressure. The contact between the V-shaped overlapping sealing assembly 720 and the insulating tie rod 400 is tighter. Compared with traditional seals with skeletons, the V-shaped overlapping sealing assembly 720 will not have a flange phenomenon due to high pressure. It can also effectively prevent gas leakage under high pressure, high speed or reciprocating motion conditions.

[0041] See Figure 6 In some embodiments of this utility model, in order to facilitate the installation and fixing of the sleeve body 710, the sleeve body 710 is provided with a stop step 711 that protrudes radially therefrom, and the external thread of the sleeve body 710 is connected to a locking nut 740 opposite to the stop step 711. The locking nut 740 and the stop step 711 define a clamping space for clamping and fixing the first mounting plate 120 or the second mounting plate 210.

[0042] See Figure 6In some embodiments of this utility model, the sleeve body 710 has an annular groove with an upward opening, and an annular guide sleeve 750 is provided at the bottom of the annular groove. An O-ring 760 is provided on the inner and outer peripheral walls of the annular guide sleeve 750. The V-shaped overlapping sealing assembly 720 is located in the annular groove and abuts against the upper end of the annular guide sleeve 750. The sleeve body 710 is threadedly connected to a pressure sleeve 770 at the opening of the annular groove, which abuts the V-shaped overlapping sealing assembly 720 and the annular guide sleeve 750 against the bottom of the annular groove. During assembly, the insulating tie rod 400 is first passed through the sleeve body 710. Then, the annular guide sleeve 750 with an O-ring seal 760 and the V-shaped stacking assembly 720 are sequentially inserted into the annular groove. The pressure sleeve 770 is then fixed to form a single unit consisting of the sleeve body 710, pressure sleeve 770, annular guide sleeve 750, and V-shaped stacking assembly 720. This unit is then passed through the first or second mounting hole, and finally, the locking nut 740 is tightened. It should be noted that before using the double-break vacuum circuit breaker, the inside of the tank assembly 100 needs to be evacuated before high-pressure dry air is introduced. During the evacuation process, the O-ring seal 760 effectively prevents external air from penetrating through the V-shaped stacking assembly 720.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A transmission system for a double-break vacuum circuit breaker, characterized in that, include: A tank assembly (100) having a cavity (110); A transmission box (200) is disposed in the cavity (110), and the transmission box (200) is provided with two moving end conductive parts (310) that are slidably disposed opposite to each other in the left-right direction; An insulating pull rod (400) is vertically inserted into the tank assembly (100), and the upper end of the insulating pull rod (400) extends into the transmission box (200); Two swing arms (510) are symmetrically distributed in the transmission box (200) about the axis of the insulating pull rod (400). One end of the swing arm (510) is rotatably connected to the transmission box (200), and the other end of the swing arm (510) is movably connected to the corresponding moving end conductive element (310). Two first connecting rods (520) are symmetrically distributed in the transmission box (200) about the axial direction of the insulating pull rod (400). One end of the first connecting rod (520) is pivotally connected to the upper end of the insulating pull rod (400), and the other end is rotatably connected to the middle of the corresponding swing arm (510).

2. The transmission system of a double-break vacuum circuit breaker according to claim 1, characterized in that: The end of the swing arm (510) is rotatably connected to a second link (530), and the end of the second link (530) away from the swing arm (510) is rotatably connected to the corresponding moving end conductive element (310).

3. The transmission system of a double-break vacuum circuit breaker according to claim 2, characterized in that: Both the first connecting rod (520) and the second connecting rod (530) are strip-shaped plates. The swing arm (510) includes two first long strips (511) sandwiched between the two side walls of the second connecting rod (530). The upper ends of the two first long strips (511) are coaxially pivotally connected to the end of the second connecting rod (530), and the lower ends of the two first long strips (511) are coaxially pivotally connected to the transmission box (200). The lower ends of the two first connecting rods (520) are... The upper end of one of the first connecting rods (520) is coaxially pivotally connected to the upper end of the insulating pull rod (400). The upper end of the first connecting rod (520) is pivotally connected between the two corresponding first long strips (511). The other first connecting rod (520) includes two second long strips (521). The lower ends of the two second long strips (521) are coaxially arranged, and the upper ends of the two second long strips (521) are respectively coaxially pivotally connected to the outer side wall of the two corresponding first long strips (511).

4. The transmission system of a double-break vacuum circuit breaker according to claim 3, characterized in that: The thickness of the first connecting rod (520) located between the two first long strips (511) is consistent with the distance between the two first long strips (511), and the thickness of the swing arm (510) located between the two second long strips (521) is consistent with the distance between the two second long strips (521).

5. The transmission system of a double-break vacuum circuit breaker according to claim 2, characterized in that: The cavity (110) is provided with two vacuum interrupter chambers (300) that correspond one-to-one with the two moving end conductive elements (310). The vacuum interrupter chamber (300) is provided with a stationary end conductive element (320) that cooperates with the moving end conductive element (310). One end of the moving end conductive element (310) extends along the transmission box (200) into the vacuum interrupter chamber (300), and the other end of the moving end conductive element (310) is connected to the second connecting rod (530) through a horizontally arranged overtravel spring assembly (600).

6. The transmission system of a double-break vacuum circuit breaker according to claim 5, characterized in that: The overtravel spring assembly (600) includes a spring sleeve (610) rotatably connected to the second connecting rod (530), and the moving end conductive element (310) has a guide rod (620) telescopically disposed within the spring sleeve (610), and a compression spring (630) is provided between the guide rod (620) and the spring sleeve (610).

7. The transmission system of a double-break vacuum circuit breaker according to claim 1, characterized in that: The lower end of the tank assembly (100) is provided with a first mounting plate (120), and the lower end of the transmission box (200) is provided with a second mounting plate (210) located above the first mounting plate (120). The first mounting plate (120) and the second mounting plate (210) are respectively provided with a first mounting hole and a second mounting hole for the insulating pull rod (400) to pass through in the vertical direction. An insulating support cylinder (220) is provided between the first mounting plate (120) and the second mounting plate (210) and sleeved on the outside of the insulating pull rod (400). A dynamic sealing assembly (700) is provided between the insulating pull rod (400) and the first mounting hole and between the insulating pull rod (400) and the second mounting hole. The internal space of the transmission box (200) forms a low-pressure air chamber, and the part of the cavity (110) outside the transmission box (200) forms a high-pressure air chamber.

8. The transmission system of a double-break vacuum circuit breaker according to claim 7, characterized in that: The dynamic sealing assembly (700) includes a sleeve body (710) fixedly installed in the first mounting hole or the second mounting hole. The insulating pull rod (400) passes through the middle of the sleeve body (710). A V-shaped overlapping sealing assembly (720) and two dustproof sealing rings (730) located above and below the V-shaped overlapping sealing assembly (720) are provided between the inner peripheral wall of the sleeve body (710) and the outer peripheral wall of the insulating pull rod (400).

9. The transmission system of a double-break vacuum circuit breaker according to claim 8, characterized in that: The sleeve body (710) is provided with a stop step (711) that protrudes radially therefrom. The sleeve body (710) is externally threaded with a locking nut (740) opposite to the stop step (711). The locking nut (740) and the stop step (711) define a clamping space for clamping and fixing the first mounting plate (120) or the second mounting plate (210).

10. The transmission system of a double-break vacuum circuit breaker according to claim 8, characterized in that: The sleeve body (710) has an annular groove with an upward opening. An annular guide sleeve (750) is provided at the bottom of the annular groove. An O-ring (760) is provided on the inner and outer peripheral walls of the annular guide sleeve (750). The V-shaped overlapping assembly (720) is located in the annular groove and abuts against the upper end of the annular guide sleeve (750). The sleeve body (710) is threadedly connected to a pressure sleeve (770) at the opening of the annular groove, which abuts the V-shaped overlapping assembly (720) and the annular guide sleeve (750) against the bottom of the annular groove.

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