A double-acting arc-extinguishing chamber, opening and closing method and circuit breaker

Abstract

The application belongs to the technical field of arc extinguishing chamber of circuit breaker, and relates to a double-acting arc extinguishing chamber, a switching-on and switching-off method and a circuit breaker. The double-acting arc extinguishing chamber comprises a moving contact, a static contact and a transmission mechanism. The static contact comprises a static support, a static arc contact and a static main contact. The moving contact comprises a moving main contact, a moving arc contact and a nozzle. The transmission mechanism comprises an upper driving rod, an upper elbow arm rod, a lower driving rod, a lower elbow arm rod, a rotating rod and a driving rod. One end of the upper driving rod is hingedly connected to the upper part of the nozzle, and the other end is hingedly connected to the upper end of the upper elbow arm rod. One end of the lower driving rod is hingedly connected to the lower part of the nozzle, and the other end is hingedly connected to the lower end of the lower elbow arm rod. The lower end of the upper elbow arm rod is hingedly connected to one end of the rotating rod, and the upper end of the lower elbow arm rod is hingedly connected to the other end of the rotating rod. The middle position of the rotating rod is hingedly connected to one end of the driving rod, and the other end of the driving rod is connected to the static arc contact. The problem of vibration caused by the instability of the linear motion of the static arc contact and the quick-return characteristic of the existing structure due to the unbalanced structure of the transmission rod is solved.

Description

Technical Field

[0001] This invention belongs to the technical field of circuit breaker arc-extinguishing chambers, specifically relating to a double-acting arc-extinguishing chamber, a method for opening and closing the circuit breaker, and a circuit breaker. Background Technology

[0002] Circuit breaker arc-extinguishing chambers commonly use two types of structures: single-acting and double-acting. Single-acting means that only the moving end moves to complete the opening and closing. In a double-acting arc-extinguishing chamber, not only the moving end moves, but the stationary side connected to it can also move. The advantage of double-acting is that the relative movement between the moving and stationary sides can improve the opening and closing speed and distance of the arc-extinguishing chamber.

[0003] Currently, double-acting circuit breaker designs generally employ a mechanical structure to connect the moving and stationary ends. A load is applied via an operating mechanism, causing the moving end to drive the mechanical structure, which in turn drives the stationary end, achieving bidirectional movement. There are two common types of double-acting mechanical rod structures. One uses a conventional linkage structure, such as the patent document with publication number CN117912881A, which discloses a double-acting arc-extinguishing structure and arc-extinguishing chamber. In this structure, one rod is a straight rod, and the other is an arc-shaped rod. Due to the imbalance of the rod structure, the force experienced during the opening and closing movements is uneven. The linear movement of the stationary arc contact relies on a guiding device for maintenance. Over time, this causes severe wear on the guiding device, accelerating the instability of the linear movement of the stationary arc contact.

[0004] Another type is the crank-slider mechanism, such as the patent document with publication number CN112614730A, which discloses a double-acting arc-extinguishing chamber transmission structure. This structure, due to its crank-slider mechanism, exhibits a quick-return characteristic during motion (the average speed of the rocker arm's reciprocating oscillation varies when the crank rotates at a constant speed). This may cause significant vibration problems for circuit breakers with high-speed mechanisms and large operating power. Furthermore, this structure also suffers from the aforementioned instability problem of the linear motion of the stationary arc contact.

[0005] In summary, during high-speed motion, the unbalanced transmission linkages in double-acting mechanical structures cause the linear motion of the stationary arc contact to rely on a guiding device for stability, which can exacerbate instability over extended periods. Furthermore, the use of a crank-slider structure in some transmission linkages makes it difficult to overcome vibrations caused by the rapid return characteristics during motion, resulting in insufficient transmission stability. Summary of the Invention

[0006] The purpose of this invention is to provide a double-acting arc-extinguishing chamber, a method for opening and closing the circuit breaker, and a circuit breaker. By adopting a multi-link symmetrical transmission arrangement, the running trajectory can be effectively compensated, and the linear motion characteristics of the horizontal drive rod can be met without relying on a guide device. This solves the vibration problem caused by the instability of the linear motion of the static arc contact and the rapid return characteristics caused by the imbalance of the transmission rod structure in the existing double-acting mechanical rod structure.

[0007] This invention is achieved through the following technical solution:

[0008] This invention discloses a double-acting arc-extinguishing chamber, comprising a moving contact, a stationary contact, and a transmission mechanism;

[0009] The stationary contact includes a stationary support, a stationary arc contact, and a stationary main contact; the stationary main contact is connected to the end of the stationary support near the moving contact, and the stationary arc contact is installed in the stationary main contact;

[0010] The moving contact includes a moving main contact, a moving arc contact, and a nozzle. The moving arc contact is installed in the moving main contact, and the nozzle is connected to the end of the moving main contact near the stationary main contact.

[0011] The transmission mechanism includes an upper drive rod, an upper crank arm, an upper support block, a lower drive rod, a lower crank arm, a lower support block, a rotating rod, and a drive rod;

[0012] Both the upper support block and the lower support block are fixedly connected to the inner wall of the static support component. The upper support block and the lower support block are arranged opposite each other and their centers are offset.

[0013] One end of the upper drive rod is hinged to the upper part of the nozzle, and the other end is hinged to the upper end of the upper crank arm.

[0014] One end of the lower drive rod is hinged to the lower part of the nozzle, and the other end is hinged to the lower end of the lower crank arm.

[0015] The lower end of the upper crank arm is hinged to one end of the rotating rod, and the upper end of the lower crank arm is hinged to the other end of the rotating rod.

[0016] The middle position of the rotating rod is hinged to one end of the driving rod, and the other end of the driving rod is connected to the end of the stationary arc contact that is away from the moving arc contact;

[0017] The upper crank arm is hinged to the upper support block at a certain position in the middle, and the lower crank arm is hinged to the lower support block at a certain position in the middle.

[0018] Furthermore, the axial distance between the upper support block and the lower support block is equal to the distance between the hinge points at both ends of the rotating rod.

[0019] Furthermore, when the rotating rod and the driving rod are in a parallel position, the stationary arc contact and the moving arc contact are in a position of just being engaged or just being disengaged.

[0020] Furthermore, a sliding groove is prefabricated on the lower end of the lower crank arm, and the sliding groove is a straight strip groove.

[0021] Furthermore, an upper hinge block is connected to the upper support block, and the upper crank arm is rotatably connected to the upper hinge block at a certain position in the middle.

[0022] Furthermore, a lower hinge block is connected to the lower support block, and the lower crank arm is rotatably connected to the lower hinge block at a certain position in the middle.

[0023] The present invention also discloses a method for opening and closing the double-acting arc-extinguishing chamber, comprising the following steps:

[0024] When the arc-extinguishing chamber closes, the moving main contact drives the nozzle and the moving arc contact to move in the closing direction. At the same time, the nozzle drives the upper and lower driving rods to move away from the moving contact. The upper driving rod drives the upper crank arm to rotate counterclockwise around the intersection of the upper support block and the upper crank arm. The lower driving rod drives the lower crank arm to rotate clockwise around the intersection of the lower support block and the lower crank arm. The rotation of the upper and lower crank arms drives the rotating rod as a whole to move closer to the moving contact. The rotating rod drives the driving rod to move closer to the moving contact. The driving rod drives the stationary arc contact to move linearly closer to the moving contact, and finally connects with the moving arc contact to complete the closing action.

[0025] When the arc-extinguishing chamber is opened, the moving main contact drives the nozzle and the moving arc contact to move in the opening direction. At the same time, the nozzle drives the upper and lower driving rods to move closer to the moving contact. The upper driving rod drives the upper crank arm to rotate clockwise around the intersection of the upper support block and the upper crank arm. The lower driving rod drives the lower crank arm to rotate counterclockwise around the intersection of the lower support block and the lower crank arm. The rotation of the upper and lower crank arms drives the rotating rod to move away from the moving contact. The rotating rod drives the driving rod to move away from the moving contact. The driving rod drives the stationary arc contact to move linearly away from the moving contact, and finally separates from the moving arc contact, completing the opening action.

[0026] During the opening and closing motion, when the stationary arc contact and the moving arc contact are at the moment of just closing or just opening, the rotating rod is parallel to the driving rod, and the upper and lower crank arms are perpendicular to the rotating rod.

[0027] Furthermore, from the moment of initial contact to the end of closing, the transmission ratio between the upper crank arm and the drive rod... The transmission ratio between the upper crank arm and the upper drive rod The transmission ratio of the upper crank arm in contact with the arc-extinguishing chamber , ;

[0028] From the moment the contact is just broken until the circuit breaker is fully open, the transmission ratio between the upper crank arm and the drive rod changes. The transmission ratio between the upper crank arm and the upper drive rod The transmission ratio of the crank arm and the arc-extinguishing chamber tripping stroke , ;

[0029] in, The angle between the upper crank arm at the end of closing and the moment of initial closing is given. The angle between the upper crank arm at the end of the opening and the moment it just opened;

[0030] It is the distance between the inner hinge point of the upper crank arm and the hinge point of the rotating rod, or the distance between the inner hinge point of the lower crank arm and the hinge point of the rotating rod.

[0031] This refers to the distance between the internal hinge point of the upper crank arm and the hinge point of the upper drive rod, or the distance between the internal hinge point of the lower crank arm and the hinge point of the lower drive rod.

[0032] further, and If the length is set to 1:X, then the moving arc contact's speed is X times the moving arc contact's speed; where 2≤X≤3.

[0033] The present invention also discloses a circuit breaker, including an operating mechanism and the double-acting arc-extinguishing chamber, wherein the operating mechanism is used to drive the moving main contacts of the double-acting arc-extinguishing chamber to perform opening and closing operations.

[0034] Compared with the prior art, the present invention has the following beneficial technical effects:

[0035] This invention discloses a double-acting arc-extinguishing chamber, comprising a moving contact, a stationary contact, and a transmission mechanism. The transmission mechanism includes an upper driving rod, an upper crank arm, an upper support block, a lower crank arm, a lower support block, a rotating rod, and a driving rod. When the transmission mechanism moves, its output point trajectory, compensated by the movement trajectories of the upper and lower crank arms, ultimately outputs an approximately linear displacement in the horizontal direction. The moving contact includes a moving main contact, a moving arc contact, and a nozzle. The stationary contact includes a stationary support, a stationary arc contact, and a stationary main contact. During transmission, the moving main contact drives the nozzle and the moving arc contact to move in the closing (opening) direction. Simultaneously, the nozzle drives the upper and lower driving rods to move away from (closer to) the moving contact, causing the upper crank arm to move clockwise (counterclockwise) around the upper support block and drive the upper end of the rotating rod to move. The lower crank arm moves counterclockwise (clockwise) around the lower support block and drives the lower end of the rotating rod to move. When the upper and lower crank arms work together to drive the rotating rod, the complementary compensation of their motion trajectories ultimately achieves radial force balance at the hinge position between the rotating rod and the driving rod, thus realizing the linear stable motion of the transmission mechanism. The transmission mechanism compensates for radial motion through a symmetrical arrangement of upper and lower connecting rods, effectively eliminating radial force. This allows for the natural linear motion of the static arc contact without the need for a guide device, improving product stability. The transmission mechanism is composed of multiple rod units, eliminating quick-return characteristics during movement, reducing mechanical vibration, and allowing for the design of specific motion trajectories, thus enabling precise design of motion characteristics.

[0036] Furthermore, by adjusting the internal hinge dimensions of the upper and lower crank arms... and By determining the length ratio, different contact strokes and different break distances can be obtained, as well as different speed ratios of the moving and stationary arc contacts. This enables the arc-extinguishing chamber to meet different opening and closing characteristics requirements and to design arc-extinguishing chambers that meet different short-circuit breaking needs.

[0037] Furthermore, by pre-fabricating a sliding groove on the lower end of the lower crank arm, the problem of jamming in high-speed transmission of multi-link articulation can be effectively solved. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a double-acting arc-extinguishing chamber at the moment of contact just closing or just opening, according to the present invention.

[0039] Figure 2 This is a schematic diagram of the connection structure between the lower crank arm and the lower drive rod.

[0040] Figure 3 This is a schematic diagram of the structure of a double-acting arc-extinguishing chamber in the closed position according to the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of a double-acting arc-extinguishing chamber in the open position according to the present invention;

[0042] Figure 5 This is a schematic diagram showing the dimensions of the crank arm and rotating rod of the present invention;

[0043] Figure 6 This is a schematic diagram showing the angle change of the upper crank arm of the double-acting arc-extinguishing chamber from the moment of closing to the end of closing.

[0044] Figure 7 This is a schematic diagram showing the angle change of the upper crank arm of the double-acting arc-extinguishing chamber from the moment it opens to the end of the opening process.

[0045] Among them, 1. static support; 12. static arc contact; 13. static main contact; 14. limit block;

[0046] 21. Upper drive rod; 22. Upper crank arm; 23. Upper support block; 24. Lower drive rod; 25. Lower crank arm; 26. Lower support block; 27. Rotating rod; 28. Drive rod;

[0047] 3. Moving main contact; 31. Moving arc contact; 32. Nozzle. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0049] The components described and illustrated in the accompanying drawings and embodiments of this invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the accompanying drawings and embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0050] Furthermore, the terms "upper," "lower," "left," and "right" are based on the orientation and positional relationship of the devices or components shown in the accompanying drawings, and are only for the purpose of better describing the present invention, rather than requiring that the devices, components, or equipment shown must have that specific orientation, and therefore should not be construed as a limitation of the present invention.

[0051] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0052] This invention discloses a double-moving arc-extinguishing chamber, including a moving contact, a stationary contact, and a transmission mechanism.

[0053] like Figure 1 As shown, the stationary contact includes a stationary support 1, a stationary arc contact 12, a stationary main contact 13, and a limiting block 14. The stationary main contact 13 is connected to the front end of the stationary support 1, and the stationary arc contact 12 is installed in the stationary main contact 13 through the limiting block 14. The limiting block 14 is fixed at the axial position of the stationary support 1, and the stationary arc contact 12 is restricted from linear reciprocating motion by the limiting block 14.

[0054] The moving contact includes a moving main contact 3, a moving arc contact 31, and a nozzle 32. The moving arc contact 31 is installed in the moving main contact 3, and the nozzle 32 is connected to the front end of the moving main contact 3.

[0055] One end of the stationary arc contact 12 extends into the stationary support 1, and the other end is used to contact the moving arc contact 31 to realize the opening and closing of the circuit.

[0056] The transmission mechanism includes an upper drive rod 21, an upper crank arm 22, an upper support block 23, a lower drive rod 24, a lower crank arm 25, a lower support block 26, a rotating rod 27, and a drive rod 28. The upper support block 23 and the lower support block 26 are both fixedly connected to the inner wall of the static support member 1. The upper support block 23 and the lower support block 26 are arranged opposite each other, with their centers offset, and the axial distance between them is equal to the distance between the hinge points at both ends of the rotating rod 27.

[0057] One end of the upper active rod 21 is hinged to the upper part of the nozzle 32, and the other end is hinged to one end of the upper crank arm 22; one end of the upper crank arm 22 is hinged to the upper active rod 21, and the other end is hinged to one end of the rotating rod 27. A position between the two hinge points is hinged to the upper support block 23.

[0058] One end of the lower drive rod 24 is hinged to the lower part of the nozzle 32, and the other end is hinged to the other end of the lower crank arm 25;

[0059] One end of the lower crank arm 25 is hinged to the lower active rod 24, and the other end is hinged to the other end of the rotating rod 27. A position between the two hinge points is hinged to the lower support block 26.

[0060] More preferably, the middle part of the rotating rod 27 is hinged to one end of the drive rod 28, and the other end of the drive rod 28 is threaded to the static arc contact 12.

[0061] like Figure 2 As shown, a sliding groove is pre-fabricated on the lower end of the lower crank arm 25. The sliding groove is a straight strip. The sliding groove can effectively eliminate transmission jamming, making the multi-link hinge transmission smoother. At the same time, the groove rail is made of wear-resistant alloy material, reducing wear caused by the reciprocating sliding of the hinge structure along the rail.

[0062] Specifically, such as Figure 1 As shown, an upper hinge block is connected to the upper support block 23, and the upper crank arm 22 is rotatably connected to the upper hinge block at a certain position in the middle; a lower hinge block is connected to each of the lower support blocks 26, and the lower crank arm 25 is rotatably connected to the lower hinge block at a certain position in the middle.

[0063] like Figure 3 As shown, when the arc-extinguishing chamber is closed, the moving main contact 3 drives the nozzle 32 and the moving arc contact 31 to move in the closing direction (left side). The nozzle 32 simultaneously drives the upper driving rod 21 and the lower driving rod 24 to move to the left. The upper driving rod 21 drives the upper crank arm 22 to rotate counterclockwise along the intersection of the upper support block 23 and the upper crank arm 22. The lower driving rod 24 drives the lower crank arm 25 to rotate clockwise along the intersection of the lower support block 26 and the lower crank arm 25. The rotation of the upper crank arm 22 and the lower crank arm 25 drives the rotating rod 27 to move to the right as a whole. The rotating rod 27 drives the driving rod 28 to move to the right. The driving rod 28 drives the stationary arc contact 12 to move linearly to the right under the action of the limit block 14, and finally connects with the moving arc contact 31 to complete the closing movement.

[0064] like Figure 4As shown, when the arc-extinguishing chamber is opened, the moving main contact 3 drives the nozzle 32 and the moving arc contact 31 to move in the opening direction (right side). The nozzle 32 simultaneously drives the upper driving rod 21 and the lower driving rod 24 to move to the right. The upper driving rod 21 drives the upper crank arm 22 to rotate clockwise along the intersection of the upper support block 23 and the upper crank arm 22. The lower driving rod 24 drives the lower crank arm 25 to rotate counterclockwise along the intersection of the lower support block 26 and the lower crank arm 25. The rotation of the upper crank arm 22 and the lower crank arm 25 drives the rotating rod 27 to move to the left as a whole. The rotating rod 27 drives the driving rod 28 to move to the left. The driving rod 28 drives the stationary arc contact 12 to move linearly to the left under the action of the limit block 14, and finally separates from the moving arc contact 31, completing the opening action.

[0065] like Figure 5 As shown, the lengths of the upper crank arm 22 and the lower crank arm 25 are both... A point is selected between the hinge points at both ends of the upper crank arm 22 and hinged to the upper support block 23, which is denoted as the internal hinge point of the upper crank arm 22; a point is selected between the hinge points at both ends of the lower crank arm 25 and hinged to the lower support block 26, which is denoted as the internal hinge point of the lower crank arm 25.

[0066] The distances between the internal hinge point of the upper crank arm 22 and the hinge point of the rotating rod 27, and the distances between the internal hinge point of the lower crank arm 25 and the hinge point of the rotating rod 27 are both... The distances between the internal hinge point of the upper crank arm 22 and the hinge point of the upper drive rod 21, and the distances between the internal hinge point of the lower crank arm 25 and the hinge point of the lower drive rod 24 are all... .

[0067] like Figure 6 As shown, from the moment of initial contact to the end of closing, the distance traveled by the stationary arc contact 12 is... , The moving arc contact 31 travels a distance of 31. , ;

[0068] in, The angle between the upper crank arm 22 at the end of closing and the moment of just closing;

[0069] Then the contact stroke of the arc extinguishing chamber .

[0070] like Figure 7 As shown, from the moment the circuit breaker just broke contact to the end of the tripping process, the distance traveled by the stationary arc contact 12 is [missing information]. , The moving arc contact 31 travels a distance of 31. , ;

[0071] Where α is the angle between the upper crank arm 22 at the end of the opening and the moment it just opened;

[0072] The travel distance from the closing point of the arc-extinguishing chamber to the opening position is:

[0073] ;

[0074] The stroke of the double-acting arc-extinguishing chamber is S. .

[0075] like Figure 6 As shown, from the moment of initial contact to the end of closing, the transmission ratio between the upper crank arm 22 and the drive rod 28 is... The transmission ratio between the upper crank arm 22 and the upper drive rod 21 The transmission ratio of the upper crank arm 22 in contact stroke with the arc-extinguishing chamber , .

[0076] like Figure 7 As shown, from the moment of initial contact to the end of the tripping process, the transmission ratio between the upper crank arm 22 and the drive rod 28 changes. The transmission ratio between the upper crank arm 22 and the upper drive rod 21 The transmission ratio of the crank arm and the arc-extinguishing chamber tripping stroke , .

[0077] in, The angle between the upper crank arm 22 at the end of closing and the moment of just closing is given. The angle between the upper crank arm 22 at the end of the opening and the moment it just opened.

[0078] During the design phase, this invention uses static simulation based on the product's insulation parameters to determine the product's tripping position, and determines the product's snap-on (or snap-off) position based on the pre-breakdown time and the product's expected closing speed. The invention also considers the travel distance from the snap-on point of the arc-extinguishing chamber to the tripping position. Multiple groups can be set , , , and The model is then incorporated into the kinematic simulation software ADAMS for parametric simulation calculations.

[0079] Will and When the length is set to 1:X, the moving arc contact 31 can move at a speed X times that of the stationary arc contact 12. This can be achieved by adjusting... and The length ratio (2≤X≤3) can realize different speed ratios of the static arc contact 12 and the moving arc contact 31 in the arc-extinguishing chamber, so as to meet the arc-extinguishing chamber design for different short-circuit breaking requirements.

[0080] The purpose of this invention is to provide a double-acting arc-extinguishing chamber, a method for opening and closing the circuit breaker, and a circuit breaker. By adopting a symmetrical transmission arrangement and compensating for the running trajectory, the linear motion of the horizontal drive rod can be achieved without relying on a guiding device. The use of a multi-link structure effectively avoids the rapid return characteristic in the transmission, ensuring smooth movement. Furthermore, by adjusting the different proportions of the internal hinge dimensions of the crank arm, different speed ratios of the moving arc contact 31 and the stationary arc contact 12 in the arc-extinguishing chamber can be achieved, meeting the arc-extinguishing chamber design requirements for different short-circuit breaking needs.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A double-acting arc-extinguishing chamber, comprising a moving contact, a stationary contact, and a transmission mechanism; the stationary contact comprises a stationary support (1), a stationary arc contact (12), and a stationary main contact (13); the stationary main contact (13) is connected to the end of the stationary support (1) near the moving contact, and the stationary arc contact (12) is installed in the stationary main contact (13); the moving contact comprises a moving main contact (3), a moving arc contact (31), and a nozzle (32), the moving arc contact (31) is installed in the moving main contact (3), and the nozzle (32) is connected to the end of the moving main contact (3) near the stationary main contact (13); characterized in that, The transmission mechanism includes an upper drive rod (21), an upper crank arm (22), an upper support block (23), a lower drive rod (24), a lower crank arm (25), a lower support block (26), a rotating rod (27), and a drive rod (28). The upper support block (23) and the lower support block (26) are both fixedly connected to the inner wall of the static support (1). The upper support block (23) and the lower support block (26) are arranged opposite to each other and their centers are offset. One end of the upper active rod (21) is hinged to the upper part of the nozzle (32), and the other end is hinged to the upper end of the upper crank arm (22); One end of the lower drive rod (24) is hinged to the lower part of the nozzle (32), and the other end is hinged to the lower end of the lower crank arm (25); The lower end of the upper crank arm (22) is hinged to one end of the rotating rod (27), and the upper end of the lower crank arm (25) is hinged to the other end of the rotating rod (27); The middle position of the rotating rod (27) is hinged to one end of the driving rod (28), and the other end of the driving rod (28) is connected to the end of the stationary arc contact (12) away from the moving arc contact (31); The upper crank arm (22) is hinged to the upper support block (23) at a certain position in the middle, and the lower crank arm (25) is hinged to the lower support block (26) at a certain position in the middle. When the stationary arc contact (12) and the moving arc contact (31) are in the position of just being engaged or just being disengaged, the rotating rod (27) and the driving rod (28) are in the parallel position, and the upper crank arm (22) and the lower crank arm (25) are both perpendicular to the rotating rod (27). The drive rod (28) drives the stationary arc contact (12) to move in a straight line toward or away from the moving contact.

2. The double-acting arc-extinguishing chamber according to claim 1, characterized in that, The axial distance between the upper support block (23) and the lower support block (26) is equal to the distance between the hinge points at both ends of the rotating rod (27).

3. The double-acting arc-extinguishing chamber according to claim 1, characterized in that, The lower end of the lower crank arm (25) has a pre-fabricated sliding groove, which is a straight strip groove.

4. A double-acting arc-extinguishing chamber according to claim 1, characterized in that, An upper hinge block is connected to the upper support block (23), and the upper crank arm (22) is rotatably connected to the upper hinge block at a certain position in the middle.

5. A double-acting arc-extinguishing chamber according to claim 1, characterized in that, A lower hinge block is connected to the lower support block (26), and the lower crank arm (25) is rotatably connected to the lower hinge block at a certain position in the middle.

6. The opening and closing method of a double-acting arc-extinguishing chamber according to any one of claims 1-5, characterized in that, Includes the following processes: When the arc-extinguishing chamber is closed, the moving main contact (3) drives the nozzle (32) and the moving arc contact (31) to move in the closing direction. At the same time, the nozzle (32) drives the upper driving rod (21) and the lower driving rod (24) to move away from the moving contact. The upper driving rod (21) drives the upper crank arm (22) to rotate counterclockwise along the intersection of the upper support block (23) and the upper crank arm (22). The lower driving rod (24) drives the lower crank arm (25) to rotate counterclockwise along the lower support block (23). The support block (26) and the lower crank arm (25) rotate clockwise at their intersection. The upper crank arm (22) and the lower crank arm (25) rotate, causing the rotating rod (27) to move towards the moving contact. The rotating rod (27) then drives the driving rod (28) to move towards the moving contact. The driving rod (28) then drives the stationary arc contact (12) to move linearly towards the moving contact, eventually connecting with the moving arc contact (31) to complete the closing action. When the arc-extinguishing chamber is opened, the moving main contact (3) drives the nozzle (32) and the moving arc contact (31) to move in the opening direction. At the same time, the nozzle (32) drives the upper driving rod (21) and the lower driving rod (24) to move closer to the moving contact. The upper driving rod (21) drives the upper crank arm (22) to rotate clockwise along the intersection of the upper support block (23) and the upper crank arm (22). The lower driving rod (24) drives the lower crank arm (25) to rotate clockwise along the lower support block (23). The support block (26) and the lower crank arm (25) rotate counterclockwise at their intersection. The upper crank arm (22) and the lower crank arm (25) rotate, causing the rotating rod (27) to move away from the moving contact. The rotating rod (27) then drives the driving rod (28) to move away from the moving contact. The driving rod (28) then drives the stationary arc contact (12) to move in a straight line away from the moving contact, eventually separating from the moving arc contact (31) and completing the opening action. During the opening and closing motion, when the stationary arc contact (12) and the moving arc contact (31) are at the moment of just closing or just opening, the rotating rod (27) is parallel to the driving rod (28), and the upper crank arm (22) and the lower crank arm (25) are both perpendicular to the rotating rod (27).

7. The method for opening and closing a double-acting arc-extinguishing chamber according to claim 6, characterized in that, From the moment of initial contact to the end of closing, the transmission ratio between the upper crank arm (22) and the drive rod (28) changes. The transmission ratio between the upper crank arm (22) and the upper drive rod (21) The transmission ratio of the upper crank arm (22) in contact stroke with the arc-extinguishing chamber , ; From the moment the contact is just broken to the end of the circuit breaker opening, the transmission ratio between the upper crank arm (22) and the drive rod (28) changes. The transmission ratio between the upper crank arm (22) and the upper drive rod (21) The transmission ratio between the upper crank arm (22) and the arc-extinguishing chamber tripping stroke , ; in, The angle between the upper crank arm (22) at the end of closing and the moment of closing. The angle between the upper crank arm (22) at the end of the opening and the moment it just opened; The length of the upper crank arm (22); The distance between the internal hinge point of the upper crank arm (22) and the hinge point of the rotating rod (27); The distance between the internal hinge point of the upper crank arm (22) and the hinge point of the upper drive rod (21) is denoted as .

8. The method for opening and closing a double-acting arc-extinguishing chamber according to claim 7, characterized in that, and If the length is set to 1:X, then the moving speed of the moving arc contact (31) is X times the moving speed of the stationary arc contact (12); where 2≤X≤3.

9. A circuit breaker, characterized in that, Includes an operating mechanism and a double-acting arc-extinguishing chamber as described in any one of claims 1 to 5, wherein the operating mechanism is used to drive the moving main contact (3) of the double-acting arc-extinguishing chamber to perform opening and closing operations.

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