Single-pole or multi-pole circuit breakers

Abstract

The present invention relates to a single-pole or multi-pole circuit breaker, and specifically designs an improved layout structure of the circuit breaker. By arranging a contact system roughly at a central position, a tripper, a locking mechanism, an operating mechanism and an arc extinguishing system are arranged roughly at the periphery in a manner of surrounding the contact system, and the length space of the circuit breaker housing is fully utilized, so that the number of arc extinguishing grids arranged is maximized, the arc extinguishing ability is stronger, the lever ratio of the tripping plate force is increased, the locking release torque is reduced, and the tripping reliability is improved. Through the single-pole modular design, it can be spliced ​​into a multi-pole product according to actual needs, thereby improving the commonality of parts and components, reducing the number of parts and components, and improving the flexibility of product application and application occasions.

Description

Technical Field

[0001] The present invention relates to a single-pole or multi-pole circuit breaker, and more particularly to an improvement in the layout structure of the circuit breaker. Background Art

[0002] Circuit breakers are a type of switchgear widely used in power distribution systems. Circuit breakers are mainly composed of a release, an operating mechanism, a contact system, and an arc extinguishing system. In the current common circuit breaker structure, there are common defects caused by the unreasonable arrangement of various mechanisms, such as poor arc extinguishing ability, large space occupation, poor isolation performance, poor versatility, etc. An optimized circuit breaker layout structure is disclosed in the invention patent with announcement number CN108695124A, in which the contact system and the operating mechanism are arranged at the upper part of the circuit breaker, the arc extinguishing system is arranged at the lower part of the circuit breaker, and the release is arranged near the operating mechanism, thereby increasing the length of the arc extinguishing chamber and the number of arc extinguishing grids arranged. However, in this patent, because the trip unit is located at one end of the arrangement direction of the arc extinguishing chamber, the trip unit and the fixed structure of the trip unit occupy the length space of the circuit breaker, so that the arc extinguishing system cannot continue to extend toward the side of the trip unit to arrange the arc extinguishing grid. The capacity of the arc extinguishing chamber is subject to hardware limitations. Moreover, in this patent, the positions of the trip unit and the operating mechanism are relatively close, and the space between them is small. In order to ensure the reliability of the tripping tripping, the design requirements for the tripping structure (such as position, dimensional accuracy, etc.) are relatively high. Summary of the invention

[0003] Therefore, in view of the above problems, the present invention proposes a circuit breaker with optimized structure.

[0004] The present invention is implemented by the following technical solutions:

[0005] The present invention proposes a circuit breaker, comprising a circuit breaker housing, a tripper, a locking mechanism, an operating mechanism, a contact system and an arc extinguishing system, wherein the contact system comprises a moving contact and a stationary contact, and the relative movement of the moving contact and the stationary contact constructs a motion trajectory for achieving conduction or disconnection, wherein the contact system is arranged roughly at a central position, and the tripper, the locking mechanism, the operating mechanism and the arc extinguishing system are arranged roughly at the periphery in a manner of surrounding the contact system, wherein: the motion trajectory of the contact system is located below the contact system, the locking mechanism spans above the contact system, the tripper and the operating mechanism are respectively arranged on both sides of the contact system, and the arc extinguishing system is arranged below the contact system in a manner of at least partially covering the motion trajectory.

[0006] Among them, in order to improve the locking performance and reduce the lock release torque, in one embodiment, the locking mechanism includes at least a tripping half-shaft and a jumper piece that can overlap and cooperate with it, and the jumper piece is arranged across the contact system. The releaser is interlockingly arranged on one side close to the tripping half-shaft, and the operating mechanism is interlockingly arranged on the other side close to the tripper piece.

[0007] To improve the safety of use, in one embodiment, the circuit breaker housing includes a base, the interior of the base has a substantially enclosed installation space, and the contact system and the arc extinguishing system are located in the installation space.

[0008] To facilitate maintenance and installation of the locking mechanism and operating mechanism, in one embodiment, the circuit breaker housing further comprises a substrate located on the base, the substrate forms an open space, and the locking mechanism is located in the open space.

[0009] To improve the arc extinguishing effect, in one embodiment, the arc extinguishing system is arranged below the contact system in a manner that completely covers the motion trajectory, and the length of the arc extinguishing system is substantially equal to the maximum length of the circuit breaker housing.

[0010] In order to increase the arc running distance of the arc and improve the arc extinguishing effect, in one embodiment, the arc extinguishing system includes the first arc running track relatively close to the moving contact, the second arc running track relatively close to the static contact, and an arc extinguishing grid group, wherein: the first arc running track has a clearance space for the moving contact to move along the motion trajectory, the arc extinguishing grid group is arranged below the moving contact and the static contact, the length of the arc extinguishing grid group is approximately equal to the maximum length of the circuit breaker housing, the first arc running track terminates at one end of the arc extinguishing grid group, and the second arc running track terminates at the other end of the arc extinguishing grid group.

[0011] The present invention also provides a multi-pole circuit breaker, comprising N single-pole circuit breakers, wherein the N single-pole circuit breakers arranged side by side are referred to as the multi-pole circuit breaker, 2≤N≤4, wherein at least one single-pole circuit breaker is the circuit breaker described above.

[0012] Among them, in order to ensure the overall effect, in one embodiment, the single-pole circuit breaker includes at least the circuit breaker housing, release, contact system and arc extinguishing system in the circuit breaker as described above, that is, a part of the single-pole circuit breaker can omit the locking mechanism and operating mechanism in the circuit breaker structure as described above.

[0013] In order to improve the commonality of multi-pole circuit breakers and reduce the number of components, in one embodiment, the contact systems of each single-pole circuit breaker are connected in series via a connection structure to achieve synchronous movement of the contact systems in each single-pole circuit breaker.

[0014] To improve isolation performance, ensure safety, and prevent arcing, in one embodiment, the contact systems and arc extinguishing systems of any two adjacent single-pole circuit breakers are isolated by the circuit breaker housing.

[0015] The present invention has the following beneficial effects: by improving the layout of the internal structure of the circuit breaker, the present invention fully utilizes the length space of the circuit breaker housing, maximizes the number of arc extinguishing grids, has a stronger arc extinguishing ability, increases the direction dimension of the tripping plate at the lock end, increases the lever ratio of the tripping plate, reduces the lock release torque, and thus improves the reliability of the tripping. At the same time, it has a large design space, which is also conducive to design and installation. And through the single-pole modular design, it can be spliced ​​into a multi-pole product according to actual needs, improves the commonality of parts, reduces the number of parts, improves the flexibility of product application and application occasions, and has good sealing and isolation performance, which improves the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional diagram of a circuit breaker in the embodiment (angle one);

[0017] Figure 2 is a three-dimensional diagram of a circuit breaker in the embodiment (angle 2);

[0018] Figure 3 is a structural exploded view of the circuit breaker in the embodiment (angle one);

[0019] Figure 4 is a structural exploded view of the circuit breaker in the embodiment (angle 2);

[0020] Figure 5 is a schematic diagram of the internal structure of a circuit breaker in an embodiment;

[0021] Figure 6 is a schematic diagram of a circuit breaker housing in an embodiment;

[0022] Figure 7 is a schematic diagram of a multi-pole circuit breaker in an embodiment;

[0023] Figure 8 is a schematic diagram of a contact system of a multi-pole circuit breaker in an embodiment connected in series via a connecting pin;

[0024] Fig. 9 Schematic diagram of the arrangement of the moving terminal, the static terminal and the contact system of the circuit breaker in the embodiment;

[0025] Fig.10 is a structural exploded view of the contact system in the embodiment;

[0026] Fig.11is a schematic diagram of the embodiment in which the moving contact and the moving terminal are connected through a flexible wire;

[0027] Fig.12 is a stereoscopic diagram of a circuit breaker moving terminal, a static terminal and a contact system in an embodiment;

[0028] Fig.13 is a three-dimensional diagram of a turntable in an embodiment;

[0029] Fig.14 is a schematic diagram of the assembly of the second connecting rod, the rotating disk and the base in the embodiment;

[0030] Fig.15 is a schematic diagram of the static terminal and the dynamic terminal being connected in the embodiment;

[0031] Fig.16 is a schematic diagram of the static terminal and the dynamic terminal being disconnected in the embodiment;

[0032] Fig.17 is a schematic diagram of the arrangement of the arc extinguishing system in the embodiment;

[0033] Fig.18 is a structural exploded diagram of the arc extinguishing system in the embodiment;

[0034] Fig.19 is a stereogram of the first running arc track in the embodiment;

[0035] Fig. 20 is a stereogram of the second running arc track in the embodiment;

[0036] Fig.21 Schematic diagram of the assembly of the first arc track, the second arc track and the arc extinguishing grid group in the embodiment;

[0037] Fig. 22 Schematic diagram of the first arc track, the second arc track and the arc extinguishing grid assembly in the embodiment after assembly;

[0038] Fig.23 is a three-dimensional diagram of the first magnetizing block in the embodiment;

[0039] Fig.24 is a three-dimensional diagram of the second magnetizing block in the embodiment;

[0040] Fig.25 1 is a schematic diagram of the arrangement of the magnetizing assembly in the embodiment (part 1);

[0041] Fig.26 Schematic diagram of the arrangement of the magnetizing assembly in the embodiment (part 2);

[0042] Fig. 27 Schematic diagram of the arrangement of the magnetizing assembly in the embodiment (part 3);

[0043] Fig.28Schematic diagram of the arrangement of the magnetizing assembly in the embodiment (part 4);

[0044] Fig.29 Schematic diagram of the arrangement of the magnetizing assembly in the embodiment (part 5);

[0045] Fig.30 is a schematic diagram of the arc in the first arc running stage in the embodiment;

[0046] Fig.31 is a schematic diagram of the arc in the second arc running stage in the embodiment;

[0047] Fig.32 is a three-dimensional diagram (part one) of the internal structure of the circuit breaker (excluding the arc extinguishing system) in the embodiment;

[0048] Fig.33 is a three-dimensional diagram of the internal structure of the circuit breaker (excluding the arc extinguishing system) in the embodiment (part 2);

[0049] Fig.34 It is a structural exploded diagram of the operating mechanism, the locking mechanism and the contact system in the embodiment;

[0050] Fig.35 is a three-dimensional diagram of a handle in an embodiment;

[0051] Fig.36 is a perspective view of a first connecting rod in an embodiment;

[0052] Fig.37 is a perspective view of the second connecting rod in the embodiment;

[0053] Fig.38 is a three-dimensional diagram of a jump button piece in an embodiment;

[0054] Fig.39 is a three-dimensional diagram of a tripping half-shaft in an embodiment (one);

[0055] Fig.40 is a schematic diagram of the arrangement positions of the operating mechanism, the locking mechanism and the contact system in the embodiment;

[0056] Fig.41 is a three-dimensional diagram of the assembly position of the operating mechanism, the locking mechanism and the contact system in the embodiment;

[0057] Fig.42 is a schematic diagram of an operating mechanism, a locking mechanism and a contact system in a circuit breaker closed state in an embodiment;

[0058] Fig.43 is a schematic diagram of an operating mechanism, a locking mechanism and a contact system in an open state of a circuit breaker in an embodiment;

[0059] Fig.44is a schematic diagram of an operating mechanism, a locking mechanism and a contact system in a tripped state of a circuit breaker in an embodiment;

[0060] Fig.45 is a schematic diagram of the first connecting rod being at a dead point during the process of the circuit breaker from opening to closing in the embodiment;

[0061] Fig.46 is a schematic diagram of the first connecting rod being at a dead point during the process of the circuit breaker from closing to opening in the embodiment;

[0062] Fig.47 is a schematic diagram of a turntable and a limiting groove for limiting the rotation of the turntable in an embodiment;

[0063] Fig.48 is a schematic diagram of the assembly of the trip half shaft and the drawbar with the circuit breaker housing in the embodiment;

[0064] Fig.49 is a stereoscopic view of a tripping half-shaft in an embodiment (part 2);

[0065] Fig.50 is a three-dimensional diagram of a tripping half-shaft in an embodiment (third);

[0066] Fig.51 is a perspective view of a traction bar in an embodiment;

[0067] Fig.52 Schematic diagram of the working principle of the second tripping combination in the embodiment (when the circuit is turned on);

[0068] Fig.53 Schematic diagram of the working principle of the second tripping combination in the embodiment (when the moving contact is repelled);

[0069] Fig.54 Schematic diagram of the working principle of the second tripping combination in the embodiment (when the tripping latch is released);

[0070] Fig.55 Schematic diagram of the force of the passive contact of the third connecting rod in the embodiment;

[0071] Fig.56 is a schematic diagram of a first tripping combination in an embodiment;

[0072] Fig.57 Schematic diagram of the structure of the tripping half-shaft in the multi-pole circuit breaker in the embodiment. DETAILED DESCRIPTION

[0073] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0074] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0075] See also Figure 1-Figure 5 As shown, as a preferred embodiment of the present invention, a circuit breaker is provided, comprising a housing, an operating mechanism 2 mounted on the housing, a contact system 3, a locking mechanism 4, a tripping device 5 and an arc extinguishing system 6, wherein the locking mechanism 4 and the tripping device 5 constitute a tripping combination of one of the tripping modes. Figure 5 ,exist Figure 5 In the illustrated picture, the contact system 3 is roughly in the middle position, the tripper 5 and the operating mechanism 2 are arranged on the upper left and upper right sides of the contact system 3, and the arc extinguishing system 6 is arranged below the contact system 3. The length of the arc extinguishing system 6 is almost equal to the maximum length of the circuit breaker housing, which fully utilizes the length space of the circuit breaker housing, maximizes the number of arc extinguishing grids, and has a stronger arc extinguishing ability. The locking mechanism 4 has a jumper 25 (see also Fig.41 As shown in the figure, the tripping piece 25 spans over the contact system 3, and one end is overlapped with the tripping half-axis 41. The tripping device 5 and the operating mechanism 2 at both ends make the design of the tripping piece 25 fully utilize the length and space dimensions of the circuit breaker, increase the dimension of the tripping piece 25 in the direction of the lock end, improve the lever ratio of the force on the tripping piece 25, reduce the lock release torque, and thus improve the tripping reliability. At the same time, its design space is large, which is also conducive to design and installation.

[0076] See also Figure 1 , Figure 2 and Figure 6The circuit breaker housing includes a base 1 and a substrate 8. The base 1 includes a first base 1' and a second base 1", which are connected to each other. The base 1 is formed by connecting the first base 1' and the second base 1", which can accommodate a contact system 3, a trip device 5 and an arc extinguishing system 6. The free gas generated by the internal arc is prevented from escaping and affecting personal safety. The substrate 8 includes a first substrate 8' and a second substrate 8", which are arranged opposite to each other. The first substrate 8' and the second substrate 8", are respectively fixed on the first base 1' and the second base 1", and an installation space for installing the operating mechanism 2 and the locking mechanism 4 is formed between the first substrate 8' and the second substrate 8". The operating mechanism 2 and the locking mechanism 4 are arranged outside the base 1, which can be easily installed and improve the convenience of product maintenance. The base 1 and the substrate 8 constitute the installation base of the operating mechanism 2, the contact system 3, the locking mechanism 4, the trip device 5 and the arc extinguishing system 6 in this embodiment. The housing and the operating mechanism 2, the contact system 3, the locking mechanism 4, the tripper 5 and the arc extinguishing system 6 installed on the housing constitute an independent single-pole circuit breaker module (such as Figure 2 ), and the independent single-pole circuit breaker modules can be spliced ​​together to form a multi-pole circuit breaker module, and connected in series between their respective contact systems 3 through connecting pins 9 to achieve synchronous pole connection (see Figure 7 and Figure 8 ), the contact system 3 is the main moving part that controls the opening and closing of the circuit breaker (the specific principle is described below). Therefore, the multi-pole circuit breaker module with synchronous poles has a synchronously moving contact system 3, so only one operating mechanism 2 is left to control the opening and closing of the circuit breaker. Each independent single-pole circuit breaker module is separated by a circuit breaker housing, which can prevent the free gas generated by the arc of one pole from escaping to other adjacent poles, thereby improving the reliability of breaking.

[0077] For the convenience of description, this embodiment is described by taking a single-pole circuit breaker module having an operating mechanism 2 .

[0078] See also Fig. 9 The circuit breaker has a static terminal 10 and a moving terminal 11 on both sides as electrical connection terminals. The static terminal 10 and the moving terminal 11 are controlled by a contact system 3 to control the conduction and disconnection between the two terminals. The contact system 3 is disconnected by rotating. Specifically, refer to Fig.10 and Fig.12 The contact system 3 includes a moving contact 31 that is roughly in the shape of a letter "J", and a hollow circular rotating disk 32. The rotating disk 32 is rotatably connected to the base 1, and the moving contact 31 is rotatably connected to the rotating disk 32. Specifically, refer to Fig.13 and Fig.14In this embodiment, the turntable 32 has a circular boss 321 at its center, and the circular boss 321 can be connected to the circular mounting hole 1'1 on the first base 1' (the size of the mounting hole 1'1 matches the size of the boss 321, and the clearance fit), so as to achieve a rotatable connection between the turntable 32 and the first base 1'. It is easy to associate that the turntable 32 can be provided with two circular bosses 321 that are respectively connected to the first base 1' and the second base 1" on both sides of the turntable 32 to increase the stability of the connection and movement of the turntable 32. In addition, refer to Fig.10 , Fig.11 and Fig.13 The moving terminal 11 is electrically connected (welded) to the moving contact 31 through a soft wire 12. The moving contact 31 has a through hole 311. The moving contact 31 is connected to the mounting hole 322 on the turntable 32 through a pin, so that the moving contact 31 can be rotatably connected to the turntable 32.

[0079] See also Fig.15 and Fig.16 , showing that the static terminal 10 and the dynamic terminal 11 are conducting ( Fig.15 In the figure, one possible current flow direction is indicated for ease of understanding) and disconnection ( Fig.16 ), the static terminal 10 has a static contact, the static contact includes a static contact point 101, the moving contact 31 has a moving contact point 312, the turntable 32 can be driven by the operating mechanism 2 or driven to rotate under the unlocking movement of the locking mechanism 4 (please refer to the following for the specific actuation mechanism), thereby driving the moving contact 31 to be relatively close to or away from the static terminal 10, when the moving contact 31 is close to the static terminal 10, the moving contact point 312 is against the static contact point 101, then the static terminal 10 and the moving terminal 11 are connected, when the moving contact 31 is away from the static terminal 10, the static terminal 10 and the moving terminal 11 are disconnected, Fig.15 and Fig.16 The state of the middle contact system 3, that is, the state of the lower contact system 3 when the circuit breaker is in the closed state and the open state.

[0080] When the static terminal 10 and the moving terminal 11 are in conduction, the moving contact 31 is separated from the static contact 101 by the repulsive force or the rotating disk 32 drives the moving contact 31 to gradually move so that the moving contact 31 and the static contact 101 are separated. The initial spacing between the moving contact 31 and the static contact 101 is small, and the electric field strength is high. When the electrons collide and ionize continuously, an arc will be generated between the contacts. Quickly and effectively extinguishing the arc generated when the circuit breaker is disconnected is one of the important functions of the circuit breaker. For this purpose, the arc extinguishing system 6 with optimized structure is designed in this embodiment.

[0081] For the convenience of description, the following definitions are made for the location and orientation:

[0082] definition Fig. 9In the illustrated picture, the position of the moving terminal 11 relative to the static terminal 10 is on the left, and the position of the static terminal 10 relative to the moving terminal 11 is on the right;

[0083] definition Figure 6 In the illustrated picture, the first base 1' is located in the front relative to the second base 1", and the second base 1" is located in the rear relative to the first base 1';

[0084] definition Fig. 9 In the illustrated picture, the moving terminal 11 and the static terminal 10 are relatively located above the arc extinguishing system 6 , and the arc extinguishing system 6 is relatively located below the moving terminal 11 and the static terminal 10 .

[0085] See also Fig.17 and Fig.18 , and refer to Figure 5 , it is defined that the moving contact 31 moves relative to the static contact to construct a motion trajectory for realizing conduction or disconnection, the arc extinguishing system 6 roughly covers the motion trajectory (it may also at least partially cover it in other embodiments), and the arc extinguishing system 6 includes a first arc track 61, a second arc track 62, an arc extinguishing grid group 63, a first magnetizing block 64, a second magnetizing block 65 and a third magnetizing block 66, wherein the first arc track 61 and the second arc track 62 are arranged on the left and right sides of the moving contact 31, and are electrically connected to the moving terminal 11 and the static terminal 10 respectively ( Fig.17 and Fig.18 The movable terminal 11 in the figure only shows one end connected to the movable contact 31 through the soft wire 12). Fig.19 The first arc track 61 is generally a bent sheet structure, including a base portion 611, an electrical connection portion 613, a connecting portion 612 and a bent portion 614. The base portion 611 serves as the main arc track of the first arc track 61. The electrical connection portion 613 is located above the base portion 611 and is used to be electrically connected to the moving terminal 11. The right end of the base portion 611 is relatively close to the moving contact 31. The connecting portion 612 simultaneously connects the base portion 611 and the electrical connection portion 613. The connecting portion 612 and the base portion 611 are generally V-shaped, so that the first arc track 614 is substantially V-shaped. The arc runway 61 itself has a V-shaped semi-enclosed space in which the second magnetizing block 65 can be installed. The connecting portion 612 is arranged to be offset from the moving contact 31 to avoid interference with the movement of the moving contact 31; the bending portion 614 is a secondary arc runway of the first arc runway 61. During the arc extinguishing process, the arc first runs on the base portion 611. If the arc is not completely extinguished on the base portion 611, it will eventually move to the bending portion 614 to reach the longest arc length in hardware. The bending portion 614 also has a vent hole 610 (see Fig.21 ), for the arc extinguishing system 6 to ventilate and dissipate heat when extinguishing the arc, so that the gas generated by the arc burning can be quickly discharged through the vent hole 610. Fig. 20The second arc track 62 includes a base portion 621, an electrical connection portion 622 and a bending portion 623. The base portion 621 serves as the main arc track of the second arc track 62. The electrical connection portion 622 is formed by bending at one end of the base portion 621 for electrically connecting to the static terminal 10. The bending portion 623 serves as the secondary arc track of the second arc track 62. During the arc extinguishing process, the arc first runs on the base portion 621. If the arc is not completely extinguished on the base portion 621, it will eventually move to the bending portion 623 to reach the longest arc length in hardware. The bending portion 623 also has an air hole 620 for ventilation and heat dissipation of the arc extinguishing system 6 when extinguishing the arc. A semi-enclosed space is formed between the second arc track 62 and the static terminal 10 in which the third magnetizing block 66 can be installed.

[0086] See again Fig.17 and Fig.18 The arc extinguishing grid group 63 is arranged below the moving contact 31. The arc extinguishing grid group 63 is composed of many individual arc extinguishing grids arranged roughly in a convex arc shape from left to right. The arrangement length of the arc extinguishing grid group 63 is approximately equal to the length of the base 1 in the left-right direction, which fully utilizes the length space inside the base 1 and maximizes the number of arranged arc extinguishing grids.

[0087] See also Fig.21 and Fig. 22 In order to facilitate the installation of the arc extinguishing grid group 63, a clamping plate 67 can be arranged before and after the arc extinguishing grid group 63, and the arc extinguishing grids are installed one by one on the clamping plate 67 (installation method such as clamping, etc.) to form an integral arc extinguishing grid group 63. The bending portion 614 of the first arc running track 61 and the bending portion 623 of the second arc running track 62 are respectively located at the left and right ends of the arc extinguishing grid group 63, so that the first arc running track 61, the second arc running track 62, the clamping plate 67 and the circuit breaker housing located below the arc extinguishing grid group 63 form a roughly closed arc extinguishing space, leaving only the air holes 610 and 620 for ventilation and heat dissipation of the arc extinguishing system 6, which can effectively prevent the arc from flowing into other chambers and burning electronic components. Fig. 22 Also shown are the deionizing filters 13 located at both ends of the arc extinguishing grid group 63 and outside the bending parts 614 and 623. The deionizing filters 13 are used to deionize the charged gas and then discharge it to achieve the effect of zero arcing.

[0088] While maximizing the length of the arc extinguishing chamber and the number of arc extinguishing grids in terms of hardware, this embodiment also designs a magnetizing component that increases the arc running speed and thus improves the arc extinguishing efficiency, including a first magnetizing block 64, a second magnetizing block 65, and a third magnetizing block 66. Fig.17 , Fig.18 and Fig.23Two first magnetizing blocks 64 are provided on the front and rear sides of the moving contact 31. The first magnetizing block 64 is a block structure roughly in the shape of a "Z". It has an expansion tube structure 641 and a J-shaped buckle structure 642 for clamping and assembling with the base 1 (correspondingly, the base 1 may be provided with a mounting hole and a clamping groove, which is obviously achievable). Fig.17 , Fig.18 and Fig.24 The second magnetizing block 65 is a block structure that is roughly "U" shaped. The second magnetizing block 65 is installed in the V-shaped semi-enclosed space of the first arc track 61. In order to fit the shape of the first arc track 61, the second magnetizing block 65 is also cut at the V-shaped fillet near the first arc track 61. The second magnetizing block 65 itself has a first U-shaped groove 650, and the first U-shaped groove 650 can accommodate the moving contact 31 to move therein. Fig.17 and Fig.18 The third magnetizing block 66 is installed between the second arc track 62 and the static terminal 10, and its shape matches the semi-closed curve formed by the second arc track 62 and the static terminal 10. Figure 25-29 The width of the third magnetizing block 66 is greater than the width of the static terminal 10 and the second arc track 62, so that the third magnetizing block 66 has a portion exposed from the second arc track 62 in the front-to-back direction, and the third magnetizing block 66 is connected to the first magnetizing block 64 at its exposed portion; specifically, refer to Fig.23 and Fig.25 , one end 643 of the first magnetizing block 64 is attached to the exposed portion of the third magnetizing block 66, so that the two oppositely arranged first magnetizing blocks 64 and third magnetizing blocks 66 enclose a U-shaped semi-enclosed space, which is defined as the second U-shaped groove 640, and the second U-shaped groove 640 and the first U-shaped groove 650 of the second magnetizing block 65 again enclose a substantially enclosed moving area of ​​the moving contact 31 (see Fig. 27 During the movement stroke of the moving contact 31 in opening and closing, it is always in this movement area. Obviously, the shape and size of the first U-shaped groove 650 and the second U-shaped groove 640 can be reasonably designed to match the movement stroke of the moving contact 31.

[0089] The first magnetizing block 64, the second magnetizing block 65 and the third magnetizing block 66 as magnetizing components are all magnetic conductors, which are used to enhance the magnetic field strength generated by the current flowing through the enclosed area (the first U-shaped groove 650 and the second U-shaped groove 640) to increase the Lorentz force on the arc to quickly lengthen the arc. The specific principle is as follows:

[0090] Ⅰ. The first arc stage: see Fig.30 , using a feasible current flow direction (current flows from the static terminal 10 to the moving terminal 11) to assist in explaining, when the moving contact 31 and the static contact begin to separate, the static contact has a direction of X1 The current on the moving contact 31 has a direction of Y 1 The current of the moving contact 31 and the stationary contact generates an arc 200, and the current of the arc 200 flows from the stationary contact to the moving contact 31. According to the right-hand screw rule, the moving contact 31 and the stationary contact simultaneously generate a magnetic field from front to back, and according to the left-hand rule, the arc 200 between the moving contact 31 and the stationary contact is subjected to an Ampere force F that is substantially downward. 1 At this time, since the moving contact 31 and the stationary contact are in the second U-shaped groove 640 area surrounded by the first magnetizing block 64 and the third magnetizing block 66 of the magnetizing assembly, the magnetic field generated by the moving contact 31 and the stationary contact is enhanced, and the Ampere force F 1 The arc is also enhanced to 200 ampere F 1 Move downward quickly under the action of.

[0091] Ⅱ. Second arcing stage: During the process of the arc 200 gradually moving downward, due to the connection between the second arcing track 62 and the static terminal 10, the right end of the arc 200 gradually moves from the static contact to the second arcing track 62; the left end of the arc 200 is initially on the moving contact 31. On the one hand, the potentials of the first arcing track 61 and the moving contact 31 are equal. On the other hand, in this embodiment, by providing the first U-shaped groove 650, the moving contact 31 can move to the upper right position close to the first arcing track 61, and the hook-shaped tip of the "J"-shaped moving contact 31 is designed to face the first arcing track 61, which generally makes the moving contact 31 relatively close to the first arcing track 61. When the moving contact 31 and the static contact begin to separate, the left end of the arc 200 jumps from the moving contact 31 to the first arcing track 61, thereby preventing the moving contact 31 from being burned by the arc for a long time and improving the electrical performance of the contact. The two ends of the arc 200 are located behind the first arc track 61 and the second arc track 62. Fig.31 At this time, the static contact has a direction of X 2 The current on the moving contact 31 has a direction of Y 2 According to the right-hand screw rule, the moving contact 31 and the stationary contact simultaneously generate a magnetic field from front to back between each other. According to the left-hand rule, the left end of the arc 200 is subjected to an Ampere force F 2 The right end of the arc 200 is subjected to an Ampere force F directed roughly to the right. 3 , in Ampere force F 2 、F 3 Under the action, the arc 200 moves quickly to the arc extinguishing grids on both sides, so that each grid can fully cut the arc. At the same time, the arc 200 is elongated, further limiting the current increase, reducing the impact on the power system, reducing the arc voltage rising speed, and shortening the arc extinguishing time.

[0092] See again Fig.17and Fig.18 It can be seen that the arc extinguishing grids of the arc extinguishing grid group 63 below the stationary contact are relatively high, and the main design consideration is to be able to extinguish the arc when the arc is in the first arc running stage.

[0093] The overall layout of this embodiment is supplemented by the design of the arc extinguishing system 6. On the one hand, the length of the arc extinguishing chamber and the number of arc extinguishing grids are maximized, making full use of the length of the circuit breaker housing, and also increasing the arc running speed, thereby improving the arc extinguishing efficiency.

[0094] In this embodiment, two independent first magnetizing blocks 64 and third magnetizing blocks 66 are connected to form a groove structure surrounding the moving contact 31 and the static contact. This is to facilitate the installation of the magnetizing blocks. In other embodiments, the first magnetizing block 64 and the third magnetizing block 66 can also be integrally formed into a whole groove structure.

[0095] The opening and closing of the circuit breaker is determined by the movement of the moving contact 31, and the operating mechanism 2 is the main structure for controlling the movement of the moving contact 31. At the same time, in conjunction with the locking mechanism 4, the operating mechanism 2 can realize the movement of the moving contact 31 when the circuit breaker trips. Fig.32 , 33 A three-dimensional diagram showing the internal structure of the circuit breaker (excluding the arc extinguishing system 6), Fig.34 The structural explosion diagram of the internal structure of the circuit breaker (excluding the arc extinguishing system 6) is shown. Figure 34-37 The operating mechanism 2 includes a handle 21, a tension spring 22, a first connecting rod 23 and a second connecting rod 24. The handle 21 has two convex circles 210 arranged opposite to each other for assembly with the circuit breaker housing; the first connecting rod 23 includes two arc-shaped long sheets 230 arranged at intervals, and the two long sheets 230 are fixedly connected together by a connecting pin 233. Through holes 231 and 232 are provided on the first connecting rod 23 for rotational connection with other components, and the connecting pin 233 has an arc-shaped groove for assembly of the tension spring 22; the second connecting rod 24 is roughly "H"-shaped, including two strip rods 242 arranged at intervals and fixedly connected by a connecting pin 243, and through holes 240 and 241 are provided on the second connecting rod 24 for rotational connection with other components; the locking mechanism 4 includes a tripping half shaft 41 and a tripping piece 25, see Figure 38-39 The tripping piece 25 is a structure roughly in the shape of a "Y" formed by joining two mirror-symmetrical unit sheets 250, including two spaced parallel connecting parts 251, a convergent part 252 extending from one end of the connecting part 251 and gradually approaching each other, and a lap part 253 connected to the end of the convergent part 252. The connecting part 251 has through holes 254 and 255 for rotationally connecting with other parts. The lap part 253 is bent in an arc shape and is used to overlap on the tripping half shaft 41 to achieve rapid tripping of the operating mechanism 2. Fig.34 , Fig.39and Fig.41 A tripping half-shaft 41 is shown, which is rotatably mounted on the circuit breaker housing and has a groove 412 and a step 411. The overlapping portion 253 of the tripping piece 25 can overlap the step 411. When the tripping half-shaft 41 rotates, the overlapping portion 253 falls into the groove 412, causing the tripping piece 25 to trip quickly (for specific details and principles, please refer to the description below).

[0096] See also Figure 40-41 , shows the assembly method of the various components of the operating mechanism 2, wherein the handle 21 is rotatably assembled on the substrate 8 with its convex circle 210 (as shown in the figure, the convex circle 210 on one side of the handle 21 is assembled on the second substrate 8" and matches the groove 8"0 of the shape of the convex circle 210. It is easy to imagine that the convex circle 210 on the other side of the handle 21 is assembled on the first substrate 8' in the same way), and the handle 21 can swing to a certain extent on the substrate 8; the jump catch piece 25 is rotatably assembled on the substrate 8 with its through hole 255 (as shown in the figure, the through hole 255 on one side of the jump catch piece 25 is assembled on the convex column 8"1 of the shape of the through hole 255 on the second substrate 8"). 25 can swing to a certain extent on the base plate 8, the overlapping portion 253 of the tripping piece 25 overlaps the tripping half shaft 41, and the tripping can be controlled by the tripping half shaft 41; the first connecting rod 23 is rotatably assembled with the through hole 232 of the first connecting rod 23 and the through hole 254 of the tripping piece 25 through a pin connection, and is rotatably assembled with the through hole 231 of the first connecting rod 24 through a pin connection; one end of the tension spring 22 is fastened to the connecting pin 233 of the first connecting rod 23, and the other end is fastened to the handle 21, wherein the tension spring 22 is connected to the lower end position of the first connecting rod 23 to increase the torque of the steering force generated by the tension spring 22 on the first connecting rod 23; refer to Fig.14 The through hole 240 of the second connecting rod 24 and the through hole 324 of the rotating disk 32 are rotatably assembled together through a pin connection; the assembled operating mechanism 2 is as shown in Fig.40As shown. Although in this embodiment, the tripping piece 25, the first connecting rod 23, and the second connecting rod 24 are all symmetrical three-dimensional structures formed by the joint of two unit sheets, such a design can increase the stability of the mutual movement and force transmission of the parts in the operating mechanism 2; but in other embodiments, it can also be a sheet-shaped structure with only one unit sheet to transmit force and movement, although the stability is not as good as in this embodiment, but the manufacturing cost can be reduced. In addition, it is worth noting that in this embodiment, the handle 21, the tripping piece 25, the first connecting rod 23, and the second connecting rod 24 are arranged in a substantially horizontal manner, while the handle 21 and the first connecting rod 23 are arranged substantially vertically. At the same time, in order to improve the stability of the transmission, the first connecting rod 23 is still a structure that is roughly tilted to the right. Such an arrangement makes the handle 21, the tripping piece 25, the first connecting rod 23, and the second connecting rod 24 staggered in a compact installation area, which helps to make the structure more compact, the transmission more efficient, and reduce the overall dimensions of the circuit breaker while maintaining the stability of the connecting rod structure.

[0097] Next, the operating principle of the operating mechanism 2 is described. Fig.42 , Fig.43 and Fig.44 They are schematic diagrams of the operating mechanism 2 when the circuit breaker is in the closed, open and tripped states. First of all, it should be noted that: first, the tension spring 22 is always in a stretched state, and its elastic restoring force provides driving force for the operating mechanism 2; second, the movement of the moving contact 31 is mainly driven by the rotation of the rotating disk 32, and the rotation range of the rotating disk 32 is limited by the limit mechanism, thereby limiting the travel of the moving contact 31. Fig.47 The rotating disk 32 is provided with a limiting boss 325 in its radial direction, and a limiting groove (such as Fig.47 The limiting groove 1"0) on the second base 1" is shown in the figure. When the turntable 32 rotates, its rotation angle is limited within the limiting groove, and the swing range of the moving contact 31 is also limited by the limiting groove. The limiting cooperation between the limiting boss 325 and the limiting groove can prevent the moving contact 31 from moving too much, avoid violent collision between the moving contact 31 and the static contact or other components, and prevent overshoot. In this embodiment, the limiting boss 325 structure on the turntable 32 cooperates with the limiting groove (limiting groove 1"0) on the base 1 to form a rotation limiting structure of the turntable 32. The limiting boss 325 and the limiting groove can be simply formed by molding technology such as injection molding, eliminating the need to install other components to form a limiting mechanism, thereby improving the reliability of the structure. The following is the movement principle of the operating mechanism 2, the locking mechanism 4 and the contact system 3:

[0098] Ⅰ. Closing state: see Fig.42In the closed state, the tripping piece 25 is overlapped on the tripping half shaft 41, and the limiting boss 325 on the rotating disk 32 is limited by the right end of the limiting groove on the base 1 and cannot rotate counterclockwise. The moving contact 31 is just against the static contact 101, and the handle 21 is in the closed position on the left, so that the tension spring 22 is located on the left (upper) side of the contact A where the first connecting rod 23 and the tripping piece 25 are rotatably connected (the contact A where the first connecting rod 23 and the tripping piece 25 are rotatably connected, that is, the pin connection between the through hole 232 of the first connecting rod 23 and the through hole 254 of the tripping piece 25, and the first connecting rod 23 can rotate relative to the tripping piece 25 around this contact). At this time, the tension spring 22 generates an elastic restoring force F on the first connecting rod 23 at the end connected to the first connecting rod 23. L1 , this elastic restoring force F L1 The first connecting rod 23 will be forced to rotate clockwise relative to the contact point A. If the first connecting rod 23 rotates clockwise, the second connecting rod 24 will move in an arc to the left and push the rotating disk 32, so that the rotating disk 32 rotates counterclockwise, and then the rotating disk 32 drives the moving contact 31 to swing to the right. In other words, the elastic restoring force F L1 The movable contact 31 has a tendency to swing to the right, and relying on this tendency, the movable contact 31 can be stably abutted against the stationary contact 101 .

[0099] Ⅱ. Closing-opening process: please refer to the sequence Fig.42 , Fig.46 and Fig.43 In the closed state, the handle 21 is pulled to swing the handle 21 to the right. During the swinging of the handle 21 to the right, the position of the pull spring 22 also changes until Fig.47 In the state, the contact point A is on the axis of the tension spring 22. At this time, the tension spring 22 generates an elastic restoring force F on the first connecting rod 23 at one end connected to the first connecting rod 23. L2 The pressure angle formed by the movement direction of the first connecting rod 23 relative to the joint A is 90°, that is, the first connecting rod 23 is at the dead point position at this time. Fig.44 ,from Fig.47 In the state of , if the handle 21 is further pulled to the right, the tension spring 22 begins to be on the right (lower) side of the contact point A, then the tension spring 22 generates an elastic restoring force F on the first connecting rod 23 at one end connected to the first connecting rod 23. L3 This will force the first connecting rod 23 to rotate counterclockwise around the joint A (F L3 When the first connecting rod 23 moves counterclockwise, the second connecting rod 24 moves to the right in an arc shape to pull the turntable 32, causing the turntable 32 to rotate clockwise. Then, the turntable 32 drives the moving contact 31 to separate from the static contact until the limiting boss 325 on the turntable 32 is limited by the limiting groove on the base 1.

[0100] Ⅲ. Opening state: see Fig.43 In the open state, the tripping piece 25 is overlapped on the tripping half shaft 41, and the limiting boss 325 on the rotating disk 32 is limited by the left end of the limiting groove on the base 1 and cannot be rotated clockwise. The handle 21 is in the right closing position, so that the tension spring 22 is located on the right (lower) side of the contact A. At this time, the tension spring 22 generates an elastic restoring force F on the first connecting rod 23 at the end connected to the first connecting rod 23. L3 , this elastic restoring force F L3 The first connecting rod 23 will be forced to rotate counterclockwise relative to the contact point A. If the first connecting rod 23 rotates counterclockwise, the second connecting rod 24 will move in an arc to the right and pull the rotating disk 32 to rotate clockwise, and then the rotating disk 32 drives the moving contact 31 to swing to the left. In other words, the elastic restoring force F L3 The movable contact 31 has a tendency to swing leftwards, and relying on this tendency, the movable contact 31 can be stably located in the opening position.

[0101] IV. Opening-closing process: Please refer to the sequence Fig.43 , Fig.45 and Fig.42 In the off state, the handle 21 is pulled to make the handle 21 swing to the left. During the swinging of the handle 21 to the left, the position of the pull spring 22 also changes until Fig.45 In the state, the contact point A is on the axis of the tension spring 22. At this time, the tension spring 22 generates an elastic restoring force F on the first connecting rod 23 at one end connected to the first connecting rod 23. L4 The pressure angle formed by the movement direction of the first connecting rod 23 relative to the joint A is 90°, that is, the first connecting rod 23 is at the dead point position at this time. Fig.42 ,from Fig.45 In the state of , if the handle 21 is further pulled to the left, the tension spring 22 begins to be on the left (upper) side of the contact point A, then the tension spring 22 generates an elastic restoring force F on the first connecting rod 23 at one end connected to the first connecting rod 23. L1 The first connecting rod 23 will be forced to rotate clockwise around the contact point A. When the first connecting rod 23 moves clockwise, the second connecting rod 24 will move in an arc to the left and push the turntable 32, so that the turntable 32 rotates counterclockwise. Then the turntable 32 drives the moving contact 31 to swing to the right until the limiting boss 325 on the turntable 32 is limited by the limiting groove on the base 1. At this time, the moving contact 31 is in contact with the static contact.

[0102] Ⅴ. Tripping process: See the sequence Fig.42 and Fig.44 In the closed state, the tripping half shaft 41 is triggered to cause the tripping piece 25 to trip and fall quickly ( Fig.44, the tripping principle of the tripping piece 25 at the tripping half-shaft 41 is described in detail later), the tripping piece 25 will rotate counterclockwise around the connection point B between it and the substrate 8, so that the contact A is driven by the tripping piece 25 to the left (upper) side of the tension spring 22, similar to the opening principle (II), the moving contact 31 will be driven to swing to the left and separate from the static contact.

[0103] Ⅵ. Reset process after tripping: See the sequence Fig.44 and Fig.43 , in the tripped state ( Fig.44 ), turning the handle 1 to the right to the opening position will cause the first connecting rod 23 to move downward in an arc shape, so that the first connecting rod 23 drives the tripping piece 25 to rotate clockwise around the contact point B, so that the tripping piece 25 is reconnected to the tripping half-shaft 41 (the principle of the resetting of the tripping piece 25 at the tripping half-shaft 41 is described later).

[0104] As can be seen from the above, in this embodiment, the position of the contact A relative to the tension spring 22 is changed through the movement between the mechanisms (it can be the change in the position of the contact A or the change in the position of the tension spring 22) to change the driving force (the elastic restoring force of the tension spring 22) and the torque generated by its action structure (the first connecting rod 23), so that the first connecting rod 23 moves and drives the operating mechanism 2 as a whole to move.

[0105] The design of the operating mechanism 2 in this embodiment is that the limiting boss 325 on the turntable 32 is limited by the base 1 when opening and closing the switch, so that the swing range of the moving contact 31 is also limited by the limiting groove, thereby preventing the moving contact 31 from moving too much, avoiding the moving contact 31 from violently colliding with the static contact or other components, reducing the overshoot generated during opening and closing, and improving the mechanical characteristics. When the limiting boss 325 on the turntable 32 is limited by the base 1, the impact reaction force generated acts on the first connecting rod 23 and the second connecting rod 24. At this time, the first connecting rod 23 and the second connecting rod 24 and the tension spring 22 form a buffer device to absorb the impact energy, thereby reducing the mechanical impact on the mechanism during opening and closing, improving the mechanical strength, and also reducing the impact on the tripping plate 25 and the tripping half shaft 41, thereby improving the locking performance. On this basis, a spring 17 can be further provided inside the turntable 32, see Figure 42-46 As shown in any one of the figures, one end of the spring 17 is fixed on the moving contact 31 , and the other end is fixed in the rotating disk 32 . The spring 17 can also absorb and buffer the movement of the moving contact 31 .

[0106] When a circuit is seriously overloaded or has a short circuit or undervoltage fault, the circuit breaker needs to be able to quickly cut off the circuit to avoid burning of components under excessive current. Therefore, circuit breakers usually have a fast tripping mechanism to quickly disconnect the circuit. The speed of tripping directly affects the ability of the circuit breaker to cut off the fault current. In this regard, when the circuit breaker in this embodiment performs electrical protection, it has two tripping modes, namely, thermal magnetic tripping and repulsion tripping, according to the size of the overcurrent. The thermal magnetic tripping mode is realized by a first tripping combination composed of a tripper 5 and a locking mechanism 4. When a smaller ampere current (such as 2.5kA in a specific typical application of this embodiment) flows over, the thermal magnetic tripping mode works. When a larger ampere current (such as 10kA in a specific typical application of this embodiment) flows over, the repulsion tripping mode mainly works. The repulsion tripping has a faster tripping speed and a stronger breaking capacity. The repulsive tripping mode is mainly realized by a second tripping combination consisting of a moving contact 31, a locking mechanism 4 and a tripping connecting rod mechanism. The locking mechanism 4 includes a tripping half shaft 41 and a tripping piece 25 that can be overlapped on the tripping half shaft 41. The tripping half shaft 41 and the tripping piece 25 can be rotatably connected to the circuit breaker housing. Figures 49-50The release half shaft 41 includes a substantially cylindrical base part 413, with a first convex column 417 and a second convex column 414 at the front and rear ends of the base part 413, which are used to rotatably match with the base plate 8, and a fan-shaped plate 415 extending substantially radially outward on the base part 413, and a third convex column 4152 extending axially backward on the base part 413 at its free end, and the fan-shaped plate 415 and the third convex column 4152 form an extension part of a substantially "L"-shaped structure that is not coaxial with the base part 413 and extends axially along the release half shaft 41. The fan-shaped plate 415 also has a raised stopper 4151. A collar 416 is sleeved and fixed on the base 413, and the collar 416 and the base 413 have a groove roughly opened along the tangent direction of the base 413 at the same position on the side. The opening depth of the groove on the collar 416 at least at one end near the upper end is greater than the opening depth of the groove on the base 413 at least at one end near the upper end, so that when the collar 416 is sleeved on the base 413, the collar 416 and the base 413 form a step 411 and a groove 412 connected together at the groove, and the groove 412 is a through groove that runs roughly from top to bottom. The overlapping portion 253 of the jump latch piece 25 can be overlapped on the step 411. When the release half shaft 41 rotates counterclockwise, the overlapping portion 253 of the jump latch piece 25 can be separated from the overlapping of the step 411 and fall from the groove 412. The collar 416 has a first paddle 4161 and a second paddle 4162 extending outwardly along the radial direction thereof. The free end of the second paddle 4162 is a "J"-shaped hook. Since the groove 412 needs to be provided, the second paddle 4162 has a gap corresponding to the groove 412 at a position corresponding to the groove 412, and the gap and the groove 412 form a space for the overlapping portion 253 of the tripping plate 25 to fall. In the front-to-back direction, the fan-shaped plate 415, the first paddle 4161 and the second paddle 4162 are separated in a "Y" shape. In this embodiment, a collar 416 is sleeved on the base 413 to form the step 411 and the groove 412 on the tripping half shaft 41, which is more convenient for production and installation. In other embodiments, the tripping half shaft 41 can also be integrally formed.

[0107] See also Fig.48The tripping half shaft 41 is rotatably connected to the through hole 8"2 on the second base plate 8" by its second protrusion 414, and the third protrusion 4152 of the tripping half shaft 41 will fall into the fan annular groove 8"3 on the second base plate 8" at the same time. The fan annular groove 8"3 limits the rotation range of the tripping half shaft 41, which prevents the tripping half shaft 41 from generating position deviation under the action of the torsion spring 14, and limits the rotation angle of the tripping half shaft 41, so as to match the design of the step 411 and the groove 412 with the overlapping portion 253. A torsion spring 14 is arranged on the left side of the fan annular groove 8"3. The torsion spring 14 is wound on the fixing seat 8"4 protruding on the second base plate 8". The first arm 141 of the torsion spring 14 is blocked by the stopper 8"5 to limit the torsion. When the release half shaft 41 is assembled on the second base plate 8", the second arm 142 of the torsion spring 14 acts on the third protrusion 4152 of the fan plate 415 of the release half shaft 41. The torsion spring 14 is limited in the front-rear direction by the limiting platform 4151 and the second base plate 8". Always give the fan The reset force of the plate 415 roughly toward the right side makes the tripping half-shaft 41 always have a tendency to rotate clockwise. On the one hand, when the tripping plate 25 is overlapped on the step 411 (that is, in the locked state), the step 411 on the tripping half-shaft 41 can be made to contact the tripping plate 25 to the right to form a stable lock. On the other hand, when the tripping plate 25 is manually opened and reset after being tripped (step V in the movement principle of the operating mechanism 2 and the contact system 3), when the rising height of the tripping plate 25 is higher than the step 411, the tripping half-shaft 41 can be manually opened and reset (step V in the movement principle of the operating mechanism 2 and the contact system 3). After 411, the tripping half shaft 41 is pushed to rotate clockwise so that the step 411 reconnects the tripping piece 25, thereby helping the tripping half shaft 41 to reset. In this embodiment, a fan-shaped annular groove is formed on the circuit breaker housing to cooperate with the tripping half shaft to form a limit mechanism, which is convenient for manufacturing and production, and improves the compactness of the structure; in this embodiment, a torsion spring 14 is used as a reset member of the tripping half shaft, which is convenient for installation and relatively low in cost. In other embodiments, a column spring or other structure can also be used as long as the above-mentioned structural functions are met.

[0108] See also Fig.51The tripping connecting rod mechanism includes a traction rod 42 which is roughly in the shape of a letter "C". The traction rod 42 includes a cylindrical base portion 421 which is used to be rotatably connected to the circuit breaker housing. A protrusion 423 and a flat plate 424 which extend roughly radially outward are connected to the outer peripheral side of the base portion 421, and a roughly hook-shaped push-butt portion 422 is connected to the outer peripheral side of the base portion 421. When the traction rod 42 rotates, the push-butt portion 422 can abut against the second paddle 4162 to transmit force to the tripping half-shaft 41 to rotate the tripping half-shaft 41. Therefore, a make way groove is provided at the place where the push-butt portion 422 and the second paddle 4162 are cut off to make way for the falling of the tripping piece 25. Furthermore, the push portion 422 is a hook-shaped structure, and the end of the push portion 422 extending approximately laterally serves as a force application point for the driving force of the second paddle 4162, so as to improve the mechanical properties of the push portion 422 as a force application structure. The second paddle 4162 is also hook-shaped, and the end of the push portion 422 can abut against the inner side of the hook structure of the second paddle 4162, so that the push-and-pull fit between the two is tighter. Fig.48 The traction rod 42 is rotatably connected to the second base 1", and in the closed state, the push portion 422 abuts against the second paddle 4162, so that the movement process between the two is shortened and the linkage efficiency is improved.

[0109] The tripping linkage mechanism also includes a third link 33, see again Fig.10 The third connecting rod 33 is rotatably connected to the inside of the rotating disk 32 by a pin connection. The third connecting rod 33 is a substantially "d"-shaped structure having a protrusion protruding toward the radial outer side of the rotating disk 32. Figure 52-Figure 54The lower end of the third connecting rod 33 rotatably connected to the rotating disk 32 and the upper end of the moving contact 31 are arranged close to each other, and each has a certain sliding mating surface. The sliding mating surfaces of the two are designed to meet the following force requirements: when the moving contact 31 rotates clockwise, the sliding mating surface at the upper end of the moving contact 31 can exert a force on the sliding mating surface at the lower end of the third connecting rod 33 to make the third connecting rod 33 also rotate clockwise, thereby making the radial outer protrusion of the third connecting rod 33 protrude toward the outer periphery of the rotating disk 32. The lower end of the third connecting rod 33 is generally a convex structure with a smooth arc surface. On the one hand, the convex structure can reduce the area of ​​the third connecting rod 33 that is subjected to force and concentrate the force. On the other hand, the smooth arc surface design can make the moving contact 31 more stable in applying force to the third connecting rod 33. The upper end of the moving contact 31 is an involute arc surface that is generally outward from the contact point C, so that the upper end of the moving contact 31 can apply force to the third connecting rod 33 more stably, and the involute arc surface design can expand the surface of the moving contact 31 that can move and apply force, and increase the reliability of the linkage between the moving contact 31 and the third connecting rod 33. Thus, when the moving contact 31 rotates clockwise around the contact point C with the rotating disk 32, the upper end of the moving contact 31 contacts the lower end of the third connecting rod 33, and causes the third connecting rod 33 to rotate clockwise around the contact point D with the rotating disk 32, thereby exposing the rotating disk 32. Its force diagram is shown as follows. Fig.55 As shown, it can be seen that the force F of the moving contact 31 on the third connecting rod 33 4 The third connecting rod 33 is located on the left side of the rotation center point of the third connecting rod 33, thereby generating a torque to rotate the third connecting rod 33 clockwise, and the rotation center D of the third connecting rod 33 is set at the end away from the moving contact 31 to increase the force arm of the rotation force when the third connecting rod 33 is pushed by the moving contact. The third connecting rod 33 and the moving contact 31 can be rotatably connected to the turntable 32, and mutual interference can be avoided under the dynamic movement of the circuit breaker. It should be noted that the design of the sliding mating surface of the lower end of the third connecting rod 33 and the upper end of the moving contact 31 is related to the movement position and appearance of the two. In different implementation applications, corresponding designs are required to meet the above-mentioned force requirements.

[0110] Please refer to the order Figure 52-54In combination with the above structural features, the repulsion tripping principle in this embodiment is as follows: when the circuit has an expected short-circuit current, the moving contact 31 is repelled under the action of the Holm force and the Lorentz magnetic force, and the upper end of the moving contact 31 pushes the third connecting rod 33 to rotate clockwise, so that the third connecting rod 33 is exposed from the rotating disk 32. During the rotation process, the protruding outer side of the third connecting rod 33 contacts the protruding portion 423 of the traction rod 42, thereby pushing the traction rod 42 to rotate clockwise. At the same time, due to the repulsion of the moving contact 31, it is out of contact with the static contact. , an arc is generated between the moving contact 31 and the static contact, the pressure in the arc extinguishing chamber increases, and the high-pressure gas will move upward to push the plate 424 (therefore, preferably, the plate 424 is a flat plate-like structure with a plane facing the direction of the arc extinguishing system 6), thereby pushing the traction rod 42 to rotate clockwise. During the clockwise rotation of the traction rod 42, its pushing portion 422 abuts against the second paddle 4162, and finally pushes the tripping half-shaft 41 to rotate counterclockwise, so that the tripping half-shaft and the tripping buckle are released, thereby causing the switch to trip and cut off the fault circuit.

[0111] Next, when the tripping piece 25 is released and the switch is manually opened and reset, it can be seen from the above-mentioned torsion spring 14 that the torsion spring 14 will drive the tripping half-shaft 41 to rotate clockwise and reset. During this process, the second paddle 4162 will contact the push-button portion 422 to push the traction rod 42 to rotate counterclockwise and reset. The third connecting rod 33 is provided with a torsion spring structure at its rotation point to reset the third connecting rod 33. Similarly, the traction rod 42 can also be provided with a reset torsion spring, but under the action mechanism of the second paddle 4162, it is not necessary to provide a reset torsion spring for the traction rod 42.

[0112] In this embodiment, a more compact and efficient two-link mechanism consisting of a third connecting rod 33 and a traction rod 42 is used to convert the motion trajectory of the sliding mating surface at the upper end of the moving contact 31 into a driving force that can move the second paddle 4162 on the tripping half-shaft 41, thereby rotating the tripping half-shaft 41 and realizing the movement of the locking mechanism to the unlocking position as an example for demonstration; however, in the application of other embodiments, other connecting rod mechanisms can also be redesigned according to specific needs, as long as they can meet the requirement of "converting the motion trajectory of the sliding mating surface of the moving contact into a driving force that can move the tripping half-shaft", they are all feasible technical solutions.

[0113] In addition, it is worth mentioning that in this embodiment, a simple and effective operating mechanism 2 is arranged on the right side of the turntable 32 to drive the turntable 32 to rotate, and a third connecting rod 33 and a traction rod 42 (as a connecting rod mechanism) are arranged in the left space of the turntable 32 to trigger the locking mechanism 4 on the upper left side of the turntable 32 downward to realize repulsive release. The arrangement makes full use of the overall space of the circuit breaker, helps to reduce the external dimensions of the circuit breaker, and the reliability of the linkage between the mechanisms is also guaranteed.

[0114] The repulsive tripping method in this embodiment utilizes the Holm force and Lorentz magnetic force generated by the short-circuit current to quickly repel the contacts, and the tripping half-shaft 41 and the jumper 25 are directly released through the connecting rod transmission (with the help of the movement coordination of the third connecting rod 33, the traction rod 42 and the second paddle 4162), thereby shortening the response time of the mechanism, improving the ability to cut off the fault current, and reducing the impact of the fault current on the system. In addition, through the direct tripping method of the connecting rod transmission, the contacts are prevented from closing with the static contacts again after being repelled, thereby preventing the arc from reigniting, reducing contact burning, and reducing the difficulty of arc extinguishing.

[0115] As mentioned above, this embodiment also has a thermal magnetic tripping method, which is realized by forming a first tripping combination of the tripper 5 and the locking mechanism 4, see Fig.56 The release 5 is a thermal magnetic release. When a short circuit occurs in the circuit, the yoke on the release 5 is magnetized, and the armature 51 is attracted to act, so that the armature 51 hits the first paddle 4161, thereby causing the release half shaft 41 to rotate counterclockwise, and the tripping piece 25 trips the switch and cuts off the fault circuit.

[0116] In addition, it should be noted that in the multi-pole circuit breaker module ( Figure 7 ), each pole of the circuit breaker module has a release 5, and the release half shaft 41 extends through the entire multi-pole circuit breaker module, so that each pole of the circuit breaker module shares a release half shaft 41, and the release half shaft 41 of each pole of the circuit breaker module rotates synchronously. Fig.57 , the tripping half-shaft 41 of each pole of the circuit breaker module has a second paddle 4162 (4162') (in the circuit breaker module without the operating mechanism 2, the tripping half-shaft 41 does not need to have a groove to provide a falling space for the tripping piece 25, so the first paddle does not need to be cut out of the groove. Fig.57 In the embodiment of the present invention, the first paddle in the circuit breaker module without the operating mechanism 2 is indicated by the label 4162', then when a short circuit occurs in any one-pole circuit breaker module, the repulsive tripping mechanism of the circuit breaker of the pole uses the Holm force and the Lorentz magnetic force generated by the short-circuit current to quickly repel the contacts, so that the tripping half-shaft 41 of the entire multi-pole circuit breaker module rotates synchronously, thereby causing the circuit breaker module with the operating mechanism 2 to trip, and then the contact systems 3 of each circuit breaker module move synchronously, and the fault current is cut off at the same time. Similarly, the tripping half-shaft 41 of each pole circuit breaker module has a first paddle 4161, so that the tripping device 5 can hit the tripping piece 25 to trip, and the switch trips.

[0117] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims will fall within the scope of protection of the present invention.

Claims

1. A single-pole circuit breaker, comprising a circuit breaker housing, a tripper, a locking mechanism, an operating mechanism, a contact system and an arc extinguishing system, wherein the contact system comprises a moving contact and a stationary contact, the relative movement of which forms a motion trajectory for achieving conduction or disconnection, and wherein: The contact system is arranged roughly in a central position, and the tripper, locking mechanism, operating mechanism and arc extinguishing system are arranged roughly on the periphery in a manner of surrounding the contact system, wherein: the movement trajectory of the contact system is located below the contact system, the locking mechanism spans above the contact system, the tripper and the operating mechanism are respectively arranged on both sides of the contact system, and the arc extinguishing system is arranged below the contact system in a manner of at least partially covering the movement trajectory.

2. The single-pole circuit breaker according to claim 1, characterized in that: The locking mechanism at least includes a tripping half-shaft and a tripping piece that can overlap and cooperate with the tripping half-shaft, and the tripping piece is arranged across the contact system. The tripper is arranged on one side close to the tripping half-shaft in a linkage manner, and the operating mechanism is arranged on the other side close to the tripping half-shaft in a linkage manner.

3. The single-pole circuit breaker according to claim 1, characterized in that: The circuit breaker housing comprises a base, the interior of the base comprises a substantially enclosed installation space, and the contact system and the arc extinguishing system are located in the installation space.

4. The single-pole circuit breaker according to claim 3, characterized in that: The circuit breaker housing further comprises a base plate located on the base, wherein the base plate forms an open space, and the locking mechanism and the operating mechanism are located in the open space.

5. The single-pole circuit breaker according to claim 1, characterized in that: The arc extinguishing system is arranged below the contact system in a manner of completely covering the motion trajectory, and the length of the arc extinguishing system is substantially equal to the maximum length of the circuit breaker housing.

6. The single-pole circuit breaker according to claim 5, characterized in that: The arc extinguishing system comprises an arc extinguishing grid group, a first arc track relatively close to the moving contact, and a second arc track relatively close to the stationary contact, wherein: the first arc track has a clearance space for the moving contact to move along the motion trajectory, the arc extinguishing grid group is arranged below the moving contact and the stationary contact, the length of the arc extinguishing grid group is substantially equal to the maximum length of the circuit breaker housing, the first arc track terminates at one end of the arc extinguishing grid group, and the second arc track terminates at the other end of the arc extinguishing grid group.

7. A multi-pole circuit breaker, characterized in that: Comprising N single-pole circuit breakers, the N single-pole circuit breakers are arranged side by side to form the multi-pole circuit breaker, 2≤N≤4, wherein at least one single-pole circuit breaker is a single-pole circuit breaker as claimed in any one of claims 1-6.

8. The multi-pole circuit breaker according to claim 7, characterized in that: The other single-pole circuit breaker at least includes a circuit breaker housing, a trip unit, a contact system and an arc extinguishing system.

9. The multi-pole circuit breaker according to claim 7 or 8, characterized in that: The contact systems of the single-pole circuit breakers are connected in series and linked by a connection structure to achieve synchronous movement of the contact systems in the single-pole circuit breakers.

10. The multi-pole circuit breaker according to claim 7 or 8, characterized in that: The contact systems and arc extinguishing systems of any two adjacent single-pole circuit breakers are isolated by a circuit breaker housing.

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