Arc extinguishing chamber and tank type circuit breaker

Abstract

The present invention relates to an arc extinguishing chamber and a tank type circuit breaker. The arc extinguishing chamber comprises: a moving contact assembly, comprising a moving contact seat and a nozzle, wherein the nozzle can reciprocate in the moving contact seat; a stationary contact assembly, comprising a stationary contact seat, a stationary support seat and a stationary arc contact, wherein the stationary arc contact is guided and slidably assembled in the stationary contact seat, and a rotating shaft is provided on the inner side wall of the stationary support seat; a connecting rod mechanism, comprising a moving end connecting rod, a stationary end connecting rod and a rotating arm, wherein the rotating arm is rotatably assembled on the rotating shaft, and wherein the rotating arm has a long section and a short section, wherein one end of the moving end connecting rod is hinged on the nozzle, and the other end of the moving end connecting rod is hinged on the long section, one end of the stationary end connecting rod is hinged on the stationary arc contact, and the other end of the stationary end connecting rod is hinged on the short section; a plane passing through the center line of the stationary contact seat and parallel to the hinge axis of the moving end connecting rod and the long section is defined as a reference plane, wherein the rotation axis of the rotating arm and the hinge axis of the stationary end connecting rod and the short section are on the same side of the reference plane.

Description

Technical Field

[0001] The invention relates to an arc extinguishing chamber and a tank type circuit breaker. Background Art

[0002] With the continuous growth of the national economy and the scale of the power grid, the transient stability of the AC power grid system, the excessive short-circuit current, and the transient overvoltage of the busbar of the DC power transmission system have become the key to restricting the scale of the power grid and the stability of the system operation. Therefore, reducing the breaking time of the tank circuit breaker can effectively solve the above problems.

[0003] A Chinese invention patent application with application publication number CN109767949A discloses an arc extinguishing chamber, such as Figure 1 and Figure 2 As shown, it includes a first contact assembly, a second contact assembly and a connecting rod mechanism, wherein the first contact assembly includes a first contact, a nozzle fixedly connected to the first contact and a nozzle pressure ring fixed at the nozzle, the second contact assembly includes a contact mounting plate, a second contact fixed to the contact mounting plate and a guide cylinder, and the nozzle pressure ring guide is slidably assembled in the guide cylinder; the connecting rod mechanism includes a first connecting rod hinged to the nozzle, a second connecting rod hinged to the contact mounting plate, and a rotating connecting rod rotatably assembled on the arc extinguishing chamber housing, and the two ends of the rotating connecting rod are respectively hinged to the first and second connecting rods. During operation, the first contact assembly is pulled by the insulating pull rod to drive the first connecting rod to move, the first connecting rod drives the rotating connecting rod to rotate, and the rotating connecting rod drives the second connecting rod to move, so as to realize that the first contact and the second contact move toward or away from each other at the same time, thereby reducing the breaking time of the tank circuit breaker.

[0004] The hinge axis between the rotating link and the first link is defined as the first hinge axis, and the hinge axis between the rotating link and the second link is defined as the second hinge axis. In order to reduce the force driving the second link to move, the distance between the rotating axis of the rotating link and the first hinge axis is greater than the distance between the rotating axis and the second hinge axis.

[0005] The rotating connecting rod is divided into a long section and a short section with the rotating axis of the rotating connecting rod as the dividing line. Since the rotating axis of the rotating connecting rod is located on the center line of the second contact, the arc extinguishing chamber needs to be made larger in order to avoid the long section of the rotating connecting rod, which is not conducive to the miniaturization of the arc extinguishing chamber. Summary of the invention

[0006] The object of the present invention is to provide an arc extinguishing chamber to solve the technical problem in the prior art that the rotation axis of the rotating connecting rod is located on the center line of the second contact, and in order to avoid the long section of the rotating connecting rod, the arc extinguishing chamber needs to be made larger; the object of the present invention is also to provide a tank type circuit breaker.

[0007] To achieve the above purpose, the technical solution of the arc extinguishing chamber of the present invention is:

[0008] Interrupter, including:

[0009] A moving contact assembly comprises a moving contact seat and a nozzle, wherein the nozzle can reciprocate in the moving contact seat;

[0010] The static contact assembly comprises a static contact seat, a static support and a static arc contact, wherein the static arc contact is guided and slidably assembled in the static contact seat, and a rotating shaft is arranged on the inner side wall of the static support;

[0011] The connecting rod mechanism comprises a moving end connecting rod, a static end connecting rod and a rotating arm, wherein the rotating arm is rotatably assembled on the rotating shaft, the rotating arm has a long section and a short section, one end of the moving end connecting rod is hinged on the nozzle, the other end of the moving end connecting rod is hinged on the long section, one end of the static end connecting rod is hinged on the static arc contact, and the other end of the static end connecting rod is hinged on the short section;

[0012] A plane passing through the center line of the stationary contact seat and parallel to the hinge axis of the moving end connecting rod and the long section is defined as the reference plane, and the rotation axis of the rotating arm and the hinge axis of the stationary end connecting rod and the short section are on the same side of the reference plane.

[0013] The beneficial effect is: since the rotation axis of the rotating arm and the hinge axis of the static end connecting rod and the short section are on the same side of the reference plane, a part of the long section of the rotating arm and the short section are on the same side of the reference plane, so as to reduce the difference between the plate section parts of the rotating arm on both sides of the reference plane. For rotating arms of the same length, while meeting the symmetry and insulation requirements of the arc extinguishing chamber, the radial dimension of the arc extinguishing chamber can be reduced, which is conducive to the miniaturization of the arc extinguishing chamber.

[0014] Furthermore, when the rotating arm is perpendicular to the static arc contact, the center point of the rotating arm is located on the reference plane.

[0015] The beneficial effect is that when the rotating arm is perpendicular to the static arc contact, the plate sections of the rotating arm on both sides of the reference plane are equal, and the radial size of the arc extinguishing chamber can be further reduced while meeting the symmetry and insulation requirements of the arc extinguishing chamber.

[0016] Furthermore, the rotating arm is a rotating plate.

[0017] The beneficial effect is that the rotating arm is designed as a rotating plate, which is convenient for hinge connection with the moving end connecting rod and the static end connecting rod.

[0018] Furthermore, the length of the connecting rod at the moving end is greater than the length of the connecting rod at the stationary end.

[0019] The beneficial effect is that: with this design, the movable end connecting rod can be directly hinged on the nozzle, and there is no need to design a support arm for the movable end connecting rod to be hinged on the nozzle.

[0020] To achieve the above object, the technical solution of the tank type circuit breaker of the present invention is:

[0021] A tank circuit breaker includes an arc extinguishing chamber and a driving mechanism, wherein the driving mechanism is used to drive a pull rod of the arc extinguishing chamber to reciprocate, and the arc extinguishing chamber includes:

[0022] A moving contact assembly comprises a moving contact seat and a nozzle, wherein the nozzle can reciprocate in the moving contact seat;

[0023] The static contact assembly comprises a static contact seat and a static arc contact, wherein the static arc contact is slidably assembled in the static contact seat, and a rotating shaft is arranged on the inner side wall of the static support;

[0024] The connecting rod mechanism comprises a moving end connecting rod, a static end connecting rod and a rotating arm, wherein the rotating arm is rotatably assembled on the rotating shaft, the rotating arm has a long section and a short section, one end of the moving end connecting rod is hinged on the nozzle, the other end of the moving end connecting rod is hinged on the long section, one end of the static end connecting rod is hinged on the static arc contact, and the other end of the static end connecting rod is hinged on the short section;

[0025] A plane passing through the center line of the stationary contact seat and parallel to the hinge axis of the moving end connecting rod and the long section is defined as the reference plane, and the rotation axis of the rotating arm and the hinge axis of the stationary end connecting rod and the short section are on the same side of the reference plane.

[0026] The beneficial effect is: since the rotation axis of the rotating arm and the hinge axis of the static end connecting rod and the short section are on the same side of the reference plane, a part of the long section of the rotating arm and the short section are on the same side of the reference plane, so as to reduce the difference between the plate section parts of the rotating arm on both sides of the reference plane. For rotating arms of the same length, while meeting the symmetry and insulation requirements of the arc extinguishing chamber, the radial dimension of the arc extinguishing chamber can be reduced, which is conducive to the miniaturization of the arc extinguishing chamber.

[0027] Furthermore, when the rotating arm is perpendicular to the static arc contact, the center point of the rotating arm is located on the reference plane.

[0028] The beneficial effect is that when the rotating arm is perpendicular to the static arc contact, the plate sections of the rotating arm on both sides of the reference plane are equal, and the radial size of the arc extinguishing chamber can be further reduced while meeting the symmetry and insulation requirements of the arc extinguishing chamber.

[0029] Furthermore, the rotating arm is a rotating plate.

[0030] The beneficial effect is that the rotating arm is designed as a rotating plate, which is convenient for hinge connection with the moving end connecting rod and the static end connecting rod.

[0031] Furthermore, the length of the connecting rod at the moving end is greater than the length of the connecting rod at the stationary end.

[0032] The beneficial effect is that: with this design, the movable end connecting rod can be directly hinged on the nozzle, and there is no need to design a support arm for the movable end connecting rod to be hinged on the nozzle.

[0033] Furthermore, the driving mechanism is a repulsive mechanism.

[0034] The beneficial effect is that the starting time of the repulsion mechanism is short, which can greatly reduce the breaking time of the tank circuit breaker.

[0035] Furthermore, a buffer is provided on the side of the repulsion mechanism facing away from the arc extinguishing chamber.

[0036] The beneficial effect is that since the stroke of the repulsion mechanism is large, the required electromagnetic driving force is also large, and adding a buffer can effectively buffer the repulsion mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of embodiment 1 of the tank type circuit breaker of the present invention;

[0038] Figure 2 for Figure 1 Schematic diagram of the structure of the arc extinguishing chamber;

[0039] Figure 3 for Figure 1 Structural diagram of the middle repulsion mechanism;

[0040] In the figure: 1. Inlet and outlet bushing; 2. Current transformer; 3. Density meter; 4. Arc extinguishing chamber; 5. Transition tube; 6. Hand hole; 7. Repulsion mechanism; 8. Cable; 9. Power supply box; 10. Right support insulator; 11. Right connecting seat; 12. Moving support; 13. Moving shielding cover; 14. Moving main contact; 15. Insulating pull rod; 16. Pull rod; 17. Left support insulator; 18. Compressed air chamber; 19. Left connecting seat; 20. Expansion chamber; 21 , moving arc contact; 22, moving contact seat; 23, rotating shaft; 24, nozzle; 25, static main contact; 26, static contact seat; 27, static support; 28, moving end connecting rod; 29, rotating plate; 30, static end connecting rod; 31, static shielding cover; 32, static arc contact; 33, joint; 34, output rod; 35, repulsion disk; 36, hydraulic buffer; 37, opening coil; 38, closing coil; 39, holding spring; 40, holding tail wing. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. 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.

[0042] 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0043] It should be noted that the relational terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. In addition, the terms "upper" and "lower" are based on the orientation and positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating that the device or component referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0045] Embodiment 1 of the tank type circuit breaker of the present invention:

[0046] like Figure 1 As shown, the tank circuit breaker includes an arc extinguishing chamber 4, a transition tube 5 and a repulsion mechanism 7 arranged from left to right. Two inlet and outlet bushings 1 are arranged on the shell of the arc extinguishing chamber 4. The lower ends of the two inlet and outlet bushings 1 are provided with current transformers 2. The current enters and exits the arc extinguishing chamber 4 through the inlet and outlet bushings 1. The current transformers 2 are used to monitor the line current. A density meter 3 is provided on the left flange of the arc extinguishing chamber 4. The density meter 3 is used to detect the density of the insulating gas in the arc extinguishing chamber 4. The repulsion mechanism 7 is connected to the power box 9 through a cable 8. Among them, the repulsion mechanism 7 constitutes a driving mechanism; the power box 9 is designed to be separated and flexible in layout.

[0047] like Figure 2As shown, the arc extinguishing chamber 4 includes a shell, in which a moving contact assembly and a static contact assembly are arranged. The moving contact assembly includes a moving contact seat 22, a moving support 12 and a right supporting insulator 10 which are connected in sequence from left to right. The right supporting insulator 10 is fixed on the right flange of the shell. A right connecting seat 11 is arranged at the position where the right supporting insulator 10 is connected to the moving support 12. The right connecting seat 11 is connected to the right side of the incoming and outgoing line bushing 1; a moving shielding cover 13 is fixedly arranged on the outer side of the moving support 12 to uniformly form the electric field and prevent the high-temperature gas generated by the breaking current from directly blowing the shell of the arc extinguishing chamber and causing breakdown to the ground; a moving main contact 14, a nozzle 24 and a moving arc contact 21 which are assembled together are arranged in the moving contact seat 22, and the nozzle 24 is driven to reciprocate by a pull rod 16, and the pull rod 16 is connected to the insulating pull rod 15. Among them, an expansion chamber 20 and a compressed air chamber 18 are also provided in the moving contact seat 22 on the right side of the nozzle 24. The expansion chamber 20 and the compressed air chamber 18 are both existing mature technologies, and their structures and functions are not described in detail.

[0048] In this embodiment, the static contact assembly includes a left supporting insulator 17, a static support 27 and a static contact seat 26 which are arranged in sequence from left to right. The left supporting insulator 17 is fixed on the left flange of the shell. A left connecting seat 19 is provided at the connecting position of the left supporting insulator 17 and the static support 27. The left connecting seat 19 is connected to the left incoming and outgoing line bushing 1. A static shielding cover 31 is fixedly provided on the outer side of the static support 27 to uniformly form an electric field and prevent the high-temperature gas generated by the breaking current from directly blowing the shell of the arc extinguishing chamber 4 and causing breakdown to the ground. A static main contact 25 and a static arc contact 32 are provided on the static contact seat 26. The static arc contact 32 is guided and slidably assembled in the static arc contact 32.

[0049] like Figure 2 As shown, the arc extinguishing chamber also includes a connecting rod mechanism, which includes a moving end connecting rod 28, a static end connecting rod 30 and a rotating plate 29. The rotating plate 29 constitutes a rotating arm. The length of the moving end connecting rod 28 is greater than that of the static end connecting rod 30. The rotating plate 29 has a long section and a short section. The right end of the moving end connecting rod 28 is hinged to the nozzle 24 through a first hinge shaft, the left end of the moving end connecting rod 28 is hinged to the long section through a second hinge shaft, the right end of the static end connecting rod 30 is hinged to the static arc contact 32 through a third hinge shaft, and the left end of the static end connecting rod 30 is hinged to the short section through a fourth hinge shaft. A rotating shaft 23 is fixed on the inner side wall of the static support 27, and the rotating plate 29 is rotatably assembled on the rotating shaft 23. Among them, the hinge axes of the above-mentioned hinge shafts are parallel to each other.

[0050] A plane passing through the center line of the static contact seat 26 and parallel to the hinge axis of the second hinge shaft is defined as the reference plane. The rotation axis of the rotating shaft 23 and the hinge axis of the fourth hinge shaft are on the same side of the reference plane. A part of the long section and the short section of the rotating plate are on the same side of the reference plane. The difference between the plate sections of the rotating plate on both sides of the reference plane can be reduced. For rotating plates of the same length, the radial dimension of the arc extinguishing chamber can be reduced while meeting the symmetry and insulation requirements of the arc extinguishing chamber, which is conducive to the miniaturization of the arc extinguishing chamber.

[0051] In this embodiment, when the rotating plate 29 is perpendicular to the static arc contact 32, the center point of the rotating plate 29 is on the reference plane. With this design, when the distance between the rotating plate 29 and the static support 27 is the smallest, the plate sections of the rotating plate 29 on both sides of the reference plane are equal. While meeting the symmetry and insulation requirements of the arc extinguishing chamber, the radial dimension of the arc extinguishing chamber can be further reduced.

[0052] In this embodiment, the starting time of the repulsion mechanism is no more than 3ms, which can greatly reduce the breaking time of the tank circuit breaker. In other embodiments, a traditional spring mechanism or hydraulic mechanism can also be used.

[0053] like Figure 3 As shown, the repulsion mechanism 7 includes an opening coil 37, a closing coil 38, a repulsion disk 35 and an output rod 34. The left end of the output rod 34 is connected to the insulating pull rod through a joint 33. The repulsion disk 35 is fixed on the output rod 34 and is located between the opening coil 37 and the closing coil 38.

[0054] In this embodiment, a hand hole 6 is provided on the transition tube 5 to facilitate the connection between the insulating pull rod 15 and the joint 33 .

[0055] In this embodiment, a holding mechanism is further provided on the right side of the repulsion mechanism 7, and the holding mechanism includes holding springs 39 arranged in pairs and holding tail wings 40 arranged in pairs. The holding springs 39 cooperate with the holding tail wings 40 to stabilize the repulsion mechanism 7 in the opening and closing positions. The working principle of the holding mechanism is an existing mature technology and will not be described in detail here.

[0056] In this embodiment, considering the insulation distance of the arc extinguishing chamber 4, the stroke of the repulsion mechanism 7 is relatively large, and the required electromagnetic driving force is also relatively large, which brings about a buffering problem; especially when the movement speed is high during the opening, it is difficult to effectively buffer by simply relying on the closing coil 38 to provide electromagnetic repulsion as a buffer due to its short action distance. By setting a buffer 36 at the right end of the output rod 34, the buffer 36 intervenes before the closing coil 38 to provide buffering at the end of the opening, which can effectively solve the buffering problem of the large-stroke repulsion mechanism. Among them, the buffer 36 uses a hydraulic buffer in the prior art.

[0057] Main conductive circuit of tank circuit breaker: the current first passes through the right incoming and outgoing line bushing 1 to the right connecting seat 11, then passes through the moving support 12, the moving contact seat 22, the moving main contact 14, the static main contact 25, the static contact seat 26 to the static support 27, and finally passes through the left connecting seat 19 to the left incoming and outgoing line bushing 1. The main conductive circuit is installed on the left and right flanges of the arc extinguishing chamber 4 through the left supporting insulator 17 and the right supporting insulator 10 to maintain insulation to the ground.

[0058] When the tank circuit breaker is in the opening state: the power box 9 discharges the opening coil 37 through the cable 8, and the opening coil 37 drives the repulsion disk 35 to move to the right. Since the output rod 34 and the repulsion disk 35 are fixedly assembled together, the output rod 34 drives the insulating pull rod 15 to move to the right through the joint 33, and the insulating pull rod 15 drives the pull rod 16, the moving main contact 14, the moving arc contact 21 and the nozzle 24 to move to the right; at the same time, the nozzle 24 drives the moving end connecting rod 28 to move to the right, and the moving end connecting rod 28 drives the static end connecting rod 30 to move to the left through the rotating plate 29 to drive the static arc contact 32 to move to the left, so that the relative acceleration between the moving arc contact and the static arc contact in the arc extinguishing chamber increases, which not only reduces the breaking time, but also reduces the requirements for operating work. Among them, the closing process is similar to the above-mentioned opening process, and will not be described in detail here.

[0059] Based on the single-break SF6 arc extinguishing chamber, the present invention designs a 252kV self-energy high-speed breaking tank type circuit breaker. The breaking time is greatly shortened compared with the traditional 252kV tank type circuit breaker. It can effectively improve the transient stability of the system, suppress overvoltage, and reduce the short-circuit current level of the system. It is of great significance to ensure the long-term safe and stable operation of the power grid system and the country's economic and energy security.

[0060] Embodiment 2 of the tank type circuit breaker of the present invention:

[0061] The difference between this embodiment and embodiment 1 is that in embodiment 1, when the rotating plate 29 is perpendicular to the static arc contact 32, the center point of the rotating plate is on the reference plane. In this embodiment, when the rotating arm is perpendicular to the static arc contact, the center point of the rotating arm and the rotation axis of the rotating shaft are on the same side of the reference plane while ensuring that the rotation axis of the rotating shaft and the hinge axis of the fourth hinge shaft are on the same side of the reference plane. In other embodiments, when the rotating arm is perpendicular to the static arc contact, the center point of the rotating arm and the rotation axis of the rotating shaft are on both sides of the reference plane while ensuring that the rotation axis of the rotating shaft and the hinge axis of the fourth hinge shaft are on the same side of the reference plane.

[0062] Embodiment 3 of the tank type circuit breaker of the present invention:

[0063] The difference between this embodiment and embodiment 1 is that in embodiment 1, the rotating arm is a rotating plate 29. In this embodiment, the rotating arm is a rotating rod.

[0064] Embodiment 4 of the tank type circuit breaker of the present invention:

[0065] The difference between this embodiment and embodiment 1 is that in embodiment 1, the length of the movable end connecting rod 28 is greater than the length of the static end connecting rod 30. In this embodiment, the nozzle has a support rod extending to the left, and the right end of the movable end connecting rod is hinged on the support rod through the first hinge shaft. At this time, the length of the movable end connecting rod is less than the length of the static end connecting rod. In other embodiments, the length of the movable end connecting rod can be equal to the length of the static end connecting rod.

[0066] The embodiment of the arc extinguishing chamber of the present invention has the same structure as the arc extinguishing chamber described in any one of the embodiments 1 to 4 of the above-mentioned tank type circuit breaker, and will not be repeated here.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. Interrupter, including: A moving contact assembly comprises a moving contact seat and a nozzle, wherein the nozzle can reciprocate in the moving contact seat; The static contact assembly comprises a static contact seat, a static support and a static arc contact, wherein the static arc contact is slidably assembled in the static contact seat, and is characterized in that a rotating shaft is fixedly mounted on the inner side wall of the static support; The connecting rod mechanism comprises a moving end connecting rod, a static end connecting rod and a rotating arm, wherein the rotating arm is rotatably assembled on the rotating shaft, the rotating arm has a long section and a short section, one end of the moving end connecting rod is hinged on the nozzle, the other end of the moving end connecting rod is hinged on the long section, one end of the static end connecting rod is hinged on the static arc contact, and the other end of the static end connecting rod is hinged on the short section; A plane passing through the center line of the static contact seat and parallel to the hinge axis of the moving end connecting rod and the long section is defined as the reference plane. The rotation axis of the rotating arm and the hinge axis of the static end connecting rod and the short section are on the same side of the reference plane. When the rotating arm is perpendicular to the static arc contact, the center point of the rotating arm is on the reference plane.

2. The arc extinguishing chamber according to claim 1, characterized in that: The rotating arm is a rotating plate.

3. The arc extinguishing chamber according to claim 1, characterized in that: The length of the connecting rod at the moving end is greater than that of the connecting rod at the static end.

4. A tank circuit breaker, comprising an arc extinguishing chamber and a driving mechanism, wherein the driving mechanism is used to drive a pull rod of the arc extinguishing chamber to reciprocate, and the arc extinguishing chamber comprises: A moving contact assembly comprises a moving contact seat and a nozzle, wherein the nozzle can reciprocate in the moving contact seat; The static contact assembly comprises a static contact seat, a static support and a static arc contact, wherein the static arc contact is slidably assembled in the static contact seat, and is characterized in that a rotating shaft is fixedly mounted on the inner side wall of the static support; The connecting rod mechanism comprises a moving end connecting rod, a static end connecting rod and a rotating arm, wherein the rotating arm is rotatably assembled on the rotating shaft, the rotating arm has a long section and a short section, one end of the moving end connecting rod is hinged on the nozzle, the other end of the moving end connecting rod is hinged on the long section, one end of the static end connecting rod is hinged on the static arc contact, and the other end of the static end connecting rod is hinged on the short section; A plane passing through the center line of the static contact seat and parallel to the hinge axis of the moving end connecting rod and the long section is defined as the reference plane. The hinge axis of the rotating arm and the hinge axis of the static end connecting rod and the short section are on the same side of the reference plane. When the rotating arm is perpendicular to the static arc contact, the center point of the rotating arm is on the reference plane.

5. The tank type circuit breaker according to claim 4, characterized in that: The rotating arm is a rotating plate.

6. The tank type circuit breaker according to claim 4, characterized in that: The length of the connecting rod at the moving end is greater than that of the connecting rod at the static end.

7. The tank type circuit breaker according to claim 4, characterized in that: The driving mechanism is a repulsion mechanism.

8. The tank type circuit breaker according to claim 7, characterized in that: A buffer is arranged on the side of the repulsion mechanism facing away from the arc extinguishing chamber.

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