Single-pole circuit breaker and circuit breaker with same

Abstract

The invention relates to a single-pole circuit breaker and a circuit breaker with the same. The single-pole circuit breaker includes: a housing; the handle is pivotally arranged on the shell; the operating mechanism is arranged in the shell and comprises a bracket fixed to the shell; the connecting rod is movably arranged on the shell and can be driven by the handle; the lock catch is pivotally arranged on the bracket and can move relative to the connecting rod; the jump pin is pivotally arranged on the bracket and has a first state in which the jump pin is locked with the lock catch to limit pivoting of the lock catch and a second state in which the jump pin is separated from the lock catch; the latch is movably arranged on the shell and can be driven by the connecting rod; the contact mechanism comprises a static contact which is fixed to the shell and comprises a first static contact part and a second static contact part; the moving contact is pivotally arranged on the bracket, can be driven by the latch and comprises a first moving contact part and a second moving contact part which are connected in series, and the first moving contact part and the second moving contact part can be respectively connected with or separated from the first static contact part and the second static contact part; and the arc extinguishing mechanism is arranged on the shell corresponding to the contact mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit protection switch devices, in particular to a single-pole circuit breaker and a circuit breaker having the same. Background Art

[0002] Circuit Breaker (CB) is widely used in industrial production and daily life. It can connect or disconnect the circuit when the power system is operating normally, and can also cut off the circuit in time when the power system has faults such as short circuit or overload, thereby effectively protecting the electrical facilities in the circuit.

[0003] How to improve the structure of circuit breakers to make them more compact and improve the performance of circuit breakers (such as breaking capacity, arc extinguishing capacity, etc.) have always been the focus of research in the industry. Summary of the invention

[0004] The present invention aims to provide a single-pole circuit breaker which can at least solve some of the above-mentioned technical problems.

[0005] The present invention also aims to provide a circuit breaker having the above improved single-pole circuit breaker.

[0006] According to one aspect of the present invention, a single-pole circuit breaker is provided, comprising: a housing; a handle pivotally mounted to the housing; an operating mechanism mounted in the housing and comprising: a bracket fixed to the housing; a connecting rod movably mounted in the housing and driven by the handle; a lock catch pivotally mounted to the bracket and movable relative to the connecting rod; a trip catch pivotally mounted to the bracket and having a first state of locking with the lock catch to limit the pivoting of the lock catch and a second state of being separated from the lock catch; a latch movably mounted in the housing and driven by the connecting rod; a contact mechanism comprising: a stationary contact fixed to the housing and comprising a first stationary contact part and a second stationary contact part; a moving contact pivotally mounted to the bracket and driven by the latch, the moving contact comprising a first moving contact part and a second moving contact part connected in series, wherein the first moving contact part can engage with or disengage from the first stationary contact part, and the second moving contact part can engage with or disengage from the second stationary contact part; and an arc extinguishing mechanism mounted in the housing corresponding to the contact mechanism.

[0007] According to the solution provided in this embodiment, two breakpoints are arranged in the single-pole circuit breaker, and the two breakpoints are connected in series, which can increase the contact opening distance in a limited space. The operating mechanism can be basically arranged along the length direction of the single-pole circuit breaker, for example, the lock and the latch extend roughly in a strip along the length direction of the single-pole circuit breaker, and the trip button is arranged on the side of the lock away from the static contact along the length direction of the single-pole circuit breaker. This arrangement can effectively compress the height of the single-pole circuit breaker without increasing the length of the single-pole circuit breaker, making the overall structure of the single-pole circuit breaker more compact.

[0008] In some embodiments, the operating mechanism also includes: a damper, which is pivotally mounted to the bracket, and the damper is configured to hinder the movement of the connecting rod in the first closing stage and is pushed to pivot in the second closing stage by a handle pivoted in the closing direction; a damping spring, which applies a force to the damper to reset it.

[0009] In some embodiments, the single-pole circuit breaker includes: a support shaft, pivotally arranged relative to the bracket, wherein the handle is pivotally engaged with the support shaft; an energy storage spring, abutting between the support shaft and the handle; a handle spring, applying a force to the handle to cause it to move in the opening direction; wherein the connecting rod is engaged with the support shaft.

[0010] In some embodiments, the lock has a slide groove, the connecting rod has a first leg engaged to the support shaft and a second leg inserted in the slide groove and capable of moving along the slide groove, wherein a buckle is connected between the first leg and the second leg.

[0011] In some embodiments, the operating mechanism includes a transmission mechanism pivotably connected to the bracket, wherein the transmission mechanism is connected between the latch and the moving contact.

[0012] In some embodiments, the transmission mechanism includes: a transmission member pivotally mounted to the bracket and pivotally connected to the latch; and a contact spring abutting between the transmission member and the moving contact.

[0013] In some embodiments, a brake opening spring is connected between the transmission member and the bracket.

[0014] In some embodiments, the single-pole circuit breaker includes an overload trip mechanism, and the overload trip mechanism is deformable to drive the trip button to pivot toward the second state.

[0015] In some embodiments, the single-pole circuit breaker includes a short-circuit tripping mechanism, which includes: an electromagnetic mechanism, installed in the housing and including a movable tripping rod arranged corresponding to the moving contact; a rocker, pivotally mounted on the bracket and capable of being driven by the tripping rod to push the tripping latch to pivot to the second state.

[0016] In some embodiments, the arc extinguishing mechanism is installed in the housing and a group of arc extinguishing grids are respectively provided corresponding to the first stationary contact part and the second stationary contact part.

[0017] According to another aspect of the present invention, there is provided a circuit breaker, which is formed by a plurality of single-pole circuit breakers connected in series, wherein each single-pole circuit breaker is any one of the single-pole circuit breakers described above.

[0018] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 is a schematic diagram of a circuit breaker consisting of four single-pole circuit breakers connected in series according to an embodiment of the present invention;

[0021] Figure 2A and Figure 2B yes Figure 1 Circuit diagram of the circuit breaker shown;

[0022] Figure 3 is a schematic diagram of the internal structure of a single-pole circuit breaker according to an embodiment of the present invention, wherein the single-pole circuit breaker is in an open state;

[0023] Figure 4 is a schematic diagram of the internal structure of a single-pole circuit breaker according to an embodiment of the present invention, wherein the single-pole circuit breaker is in a closed state;

[0024] Figure 5 is a three-dimensional schematic diagram of the internal structure of a single-pole circuit breaker according to an embodiment of the present invention;

[0025] Figure 6 is a three-dimensional schematic diagram of the internal structure of a single-pole circuit breaker according to an embodiment of the present invention viewed from the other side, showing Figure 5 Different perspectives;

[0026] Figure 7 is a partial schematic diagram of the internal structure of a single-pole circuit breaker according to an embodiment of the present invention;

[0027] Figure 8is a schematic diagram of an operating mechanism of a single-pole circuit breaker according to an embodiment of the present invention;

[0028] Fig. 9 is a schematic diagram of an operating mechanism of a single-pole circuit breaker according to an embodiment of the present invention, showing Figure 8 Different perspectives;

[0029] Fig.10 is a schematic diagram of an operating mechanism of a single-pole circuit breaker according to an embodiment of the present invention, wherein the bracket is omitted;

[0030] Fig.11 is a schematic diagram of a handle of a single-pole circuit breaker according to an embodiment of the present invention;

[0031] Fig.12 is a schematic diagram of damping of a single-pole circuit breaker according to an embodiment of the present invention;

[0032] Fig.13 is a schematic diagram of a lock of a single-pole circuit breaker according to an embodiment of the present invention;

[0033] Fig.14 is a schematic diagram of a connecting rod and a buckle of a single-pole circuit breaker according to an embodiment of the present invention;

[0034] Fig.15 Schematic diagram of an electromagnetic mechanism of a single-pole circuit breaker according to an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 100. Single-pole circuit breaker; 1. housing; 2. handle; 21. protrusion; 22. handle spring;

[0037] 23. Energy storage spring; 24. Bottom; 25. Top; 3. Operating mechanism; 30. Bracket;

[0038] 301, first support plate; 303, first cantilever; 302, second support plate; 304, second cantilever

[0039] arm; 305, stop arm; 306, third cantilever; 31, support shaft; 311, engagement protrusion;

[0040] 32, connecting rod; 321, first leg; 322, second leg; 323, buckle; 33, stop

[0041] 331, first stop groove; 332, second stop groove; 333, stopper; 334, damping

[0042] Spring; 335, through hole; 34, lock; 341, slide; 342, through hole; 343, convex

[0043] 344, protrusion; 345, lock plate; 346, pin; 35, jump buckle; 351,

[0044] A stop protrusion; 352, a second stop protrusion; 353, a pin; 354, a jump spring;

[0045] 355, mounting protrusion; 36, latch; 361, pin; 362, receiving groove; 37, transmission

[0046] Mechanism; 371, transmission member; 372, contact spring; 373, pin shaft; 374, mounting arm;

[0047] 38. Opening spring; 39. Indicator; 391. Opening indicator; 392. Closing indicator

[0048] 393, positioning arm; 41, first terminal; 42, second terminal; 5,

[0049] Moving contact; 51, first moving contact part; 52, second moving contact part; 53, support; 6,

[0050] Static contact; 61, first static contact part; 62, second static contact part; 7, short-circuit switch

[0051] Structure; 71, electromagnetic mechanism; 711, sleeve; 712, coil; 713, opening lever; 714,

[0052] Magnetic yoke; 715, armature; 716, return spring; 72, rocker; 721, pin; 8,

[0053] Overload tripping mechanism; 81, conductor; 9, arc extinguishing mechanism; 91, arc extinguishing grid; 92, increase

[0054] Magnetic block; 93, gas-producing sheet DETAILED DESCRIPTION

[0055] Now, with reference to the accompanying drawings, the single-pole circuit breaker disclosed in the present invention and the schematic scheme of the circuit breaker formed by connecting a plurality of single-pole circuit breakers in series are described in detail. Although the accompanying drawings are provided to present some embodiments of the present invention, the accompanying drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed or partially cut away to better illustrate and explain the disclosure of the present invention. Some components in the accompanying drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the accompanying drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0056] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0057] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0058] Figure 1 A circuit breaker (eg, a miniature circuit breaker) consisting of four single-pole circuit breakers 100 is shown, wherein the circuit breaker adopts a four-pole series connection mode. Figure 2A and Figure 2B Two circuit diagrams of the four-pole series circuit breaker are shown.

[0059] The structures of the four single-pole circuit breakers 100 constituting the circuit breaker are the same, and one of the single-pole circuit breakers 100 is taken as an example to describe its structure in detail.

[0060] Figures 3 to 10 An example of a single-pole circuit breaker 100 is shown. Figure 3 As shown, the single-pole circuit breaker 100 comprises a housing 1 and a handle 2, an operating mechanism 3, a contact mechanism, a tripping mechanism and an arc extinguishing mechanism 9 mounted on the housing 1. The housing 1 is composed of two half-shells, which enclose an internal space for mounting other components.

[0061] First reference Figure 7 , a double breakpoint is arranged in the housing 1 of the single-pole circuit breaker 100. By connecting the double breakpoints in series, the contact opening distance can be increased in a limited space. In the illustrated embodiment, the first terminal 41 is connected to the first static contact part 61 in the static contact 6, and the second static contact part 62 in the static contact 61 is arranged separately from the first static contact part 61. The moving contact 5 is pivotally mounted in the housing 1 and has a first moving contact part 51 and a second moving contact part 52 connected in series, wherein the first moving contact part 51 can be engaged with the first static contact part 61, and the second moving contact part 52 can be engaged with the second static contact part 62. The second static contact part 62 is connected to the short-circuit tripping mechanism 7, and the short-circuit tripping mechanism 7 is connected to the second terminal 42. In addition, the overload tripping mechanism 8 is connected to the second terminal 42 through a wire 81. Thus, the single-pole circuit breaker 100 can be connected to the circuit.

[0062] The handle 2 is pivotally mounted to the housing 1 and is drivingly connected to the operating mechanism 3. By pivoting the handle 2, the operating mechanism 3 is driven to move, thereby pushing the moving contact of the contact mechanism close to the static contact and closing the circuit breaker, or pulling the moving contact away from the static contact and opening the circuit breaker.

[0063] like Figures 5 and 6 , Figure 8 , Figure 10 to Figure 11 As shown in detail, the bracket 30 of the operating mechanism 3 is fixed in the housing 1. The bracket 30 includes a first support plate 301 and a second support plate 302 arranged oppositely and at intervals. In one embodiment, a fixing pin can be formed on the inner wall of the housing 1, and a through hole can be formed on each of the first support plate 301 and the second support plate 302. The first support plate 301 and the second support plate 302 are fixed to the housing 1 by inserting the fixing pin into the corresponding through hole. The handle 2 is sleeved on the support shaft 31, the bottom 24 of the handle 2 rotatably surrounds the support shaft 31, and the top 25 of the handle 2 is in a plate shape and extends from the housing 1 for manual operation, thereby, the handle 2 can rotate around the support shaft 31. The support shaft 31 is sleeved on the pin connected between the first support plate 301 and the second support plate 302 and can rotate around the central axis of the pin. The energy storage spring 23 is arranged around the support shaft 31 and one leg is inserted into the support shaft 31, and the other leg is inserted into the handle 2, whereby the energy storage spring 23 is pressed between the support shaft 31 and the handle 2.

[0064] Figure 8 Two support shafts 31 and two energy storage springs 23 are shown, which are arranged in parallel along the axial direction, wherein one leg of each of the two energy storage springs 23 is plugged into the corresponding support shaft 31, and the other leg of each of the two energy storage springs 23 is plugged into the same handle 2. The two support shafts 31 are connected together by rivets inserted into the two support shafts 31, and the rivets are sleeved on the pins connected between the first support plate 301 and the second support plate 302. Those skilled in the art will understand that in other embodiments, the number of support shafts 31 and energy storage springs 23 can be increased or decreased as needed, for example, the number of support shafts 31 and energy storage springs 23 is reduced to one each, or two energy storage springs are arranged on one support shaft, wherein one leg of each of the two energy storage springs is plugged into the same support shaft, and the other leg of each of the two energy storage springs is plugged into the same handle. The handle spring 22 is sleeved on the support shaft 31, with one leg abutting against the end of the energy storage spring 23 extending from the support shaft 31, and the other leg abutting against the first cantilever 303 extending from the first support plate 301. Thus, the handle spring 22 is pressed between the first support plate 301 and the energy storage spring 23, and always applies force to the handle 2 to rotate it in the opening direction.

[0065] The connecting rod 32 of the operating mechanism 3 is coupled to the support shaft 31 and can move with the pivoting of the support shaft 31. Figures 8 to 10 and Fig.14As shown, the support shaft 31 is formed with a protruding engagement protrusion 311, the first leg 321 of the connecting rod 32 is inserted into the engagement protrusion 311, the second leg 322 is spaced apart from the first leg 321, and a buckle 323 is connected between the first leg 321 and the second leg 322. In one embodiment, the first leg 321 and the second leg 322 are parallel. When the support shaft 31 pivots, the first leg 321 rotates around the central axis of the support shaft 31, and the buckle 232 pushes the second leg 322 to move synchronously.

[0066] The second leg 322 of the connecting rod 32 is inserted into the sliding groove 341 of the lock buckle 34 and can move along the sliding groove 341 . Fig.13 An example of a lock catch 34 is shown. In the illustrated embodiment, the lock catch 34 includes a pair of lock plates 345 arranged opposite to each other, each lock plate 345 is formed with a slide groove 341, and the slide grooves 341 of the two lock plates 345 have the same configuration. The buckle 323 can be arranged between the two lock plates 345 to make the structure more compact. The lock catch 34 is in the shape of a long strip as a whole and is basically arranged along the length direction of the single-pole circuit breaker 100. The slide groove 341 extends along the length direction of the lock catch 34 and is roughly divided into two sections that are joined at an angle, wherein the first section that is relatively close to the support shaft 31 extends slightly upwardly in a direction away from the support shaft 31, and the second section that is relatively far from the support shaft 31 extends downwardly in a direction away from the support shaft 31. As a result, the movement of the second leg 322 of the connecting rod 31 in the slide groove 341 is to move obliquely upward in a direction away from the support shaft 31, and then fall downward into the second section of the slide groove 341. The lock buckle 34 is further formed with a through hole 342 for passing a pin shaft 346 , and the pin shaft 346 is connected between the first support plate 301 and the second support plate 302 of the bracket 30 .

[0067] The lock catch 34 is locked together with the trip catch 35 when the single-pole circuit breaker 100 is in the closed state and cannot rotate around the pin 346. Figures 8 to 10As shown, a pin shaft 353 is connected between the first support plate 301 and the second support plate 302 of the bracket 30, and the trip buckle 35 is sleeved on the pin shaft 353 and can rotate around the pin shaft 353. When the trip buckle 35 pivots to the first state, it will be locked with the lock buckle 34 and limit the pivoting of the lock buckle 34 around the pin shaft 346, so that the single-pole circuit breaker 100 is kept in the closed state. When the trip buckle 35 pivots to the second state, it will be separated from the lock buckle 34 and allow the lock buckle 34 to pivot around the pin shaft 346, so that the single-pole circuit breaker 100 can be opened. In order to achieve the locking of the lock buckle 34 and the trip buckle 35, a boss 343 is formed on the lock buckle 34, and a groove (not shown in the figure) suitable for accommodating the boss 343 is formed on the trip buckle 35. In the first state, the boss 343 of the lock catch 34 is inserted into the groove of the jump catch 35, and in the second state, the boss 343 of the lock catch 34 is disengaged from the groove of the jump catch 35. Of course, those skilled in the art will understand that a groove can also be formed on the lock catch, and a boss can be formed on the jump catch. The jump catch 35 is also formed with a mounting protrusion 355, and the second support plate 302 is formed with a second cantilever 304, and a jump catch spring 354 for keeping the jump catch 35 in the first state is connected between the mounting protrusion 355 and the second cantilever 304.

[0068] One end of the latch 36 of the operating mechanism 3 is pivotally connected to the second leg 322 of the connecting rod 23, and the other end of the latch 36 is pivotally connected to a pin 361, which can move in the housing 1 under the drive of the latch 36. The latch 36 is in the shape of a long rod and is arranged substantially along the length direction of the single-machine circuit breaker 100.

[0069] A transmission mechanism 37 is connected between the latch 36 and the moving contact 5 of the contact mechanism. Figures 5 and 6 and Figures 8 to 10 As shown, the transmission mechanism 37 includes a transmission member 371 and a contact spring 372. The transmission member 371 is mounted on a pin 373 and can pivot around the pin 373, and the pin 373 is connected between the first support plate 301 and the second support plate 302 of the bracket 30. The transmission member 371 can also be pivotally connected to the pin 361. Thereby, the movement of the latch 36 can drive the transmission member 371 to pivot around the pin 373. The contact spring 372 is also sleeved on the pin 373, and one leg abuts against the transmission member 371, and the other leg abuts against the movable contact 5, and the abutment points of the two legs are located on opposite sides of the pin 373. As a result, the contact spring 372 is pressed between the transmission member 371 and the movable contact 5. In the embodiment shown, the movable contact 5 is pivotally mounted to the pin 373 through the support 53.

[0070] The damper 33 is also pivotally mounted on the pin 346 on which the lock catch 34 is mounted. Fig.12As shown, the damper 33 is formed with a through hole 335 for passing the pin shaft 346. The side of the damper 33 facing the connecting rod 32 is formed with a first stop groove 331 at the bottom and a second stop groove 332 at the top, which will cooperate with the connecting rod 32 and the handle 2 during the closing of the single-pole circuit breaker 100, respectively, to achieve the two-stage fast closing of the single-pole circuit breaker 100, which will be described in detail later. The damping spring 334 is installed on the damper 33, one of the legs abuts against the third cantilever 306 of the second support plate 302, and the other leg abuts against the damper, thereby, the damping spring 344 applies a biasing force to the damper 34 to reset it. Under the bias of the damping spring 344, the damper 34 can resist the movement of the connecting rod 322 during the closing period. In order to prevent the damper 34 from excessively deflecting under the bias of the damping spring 344 , the second support plate 302 is further formed with a stopper arm 305 , which forms a stopper fit with the protruding stopper portion 333 of the damper 33 .

[0071] Combine the following Figures 8 to 10 , the process of closing and opening the circuit breaker by operating the operating mechanism 3 through the handle 2 is described in detail.

[0072] Figures 8 to 10 The single-pole circuit breaker 100 is shown in the open state. For the purpose of closing the circuit breaker, the handle 2 is rotated in the closing direction, for example, Figure 8 The position shown is taken as a reference, and the handle 2 is rotated clockwise. The rotation of the handle 2 is converted into the rotation of the support shaft 31 through the energy storage spring 23, and further pushes the second leg 322 of the connecting rod 32 to move along the slide groove 341 of the lock catch 34 and away from the support shaft 31. At this time, since the lock catch 34 is locked with the jump catch 35, the movement of the connecting rod 32 will not cause the lock catch 34 to pivot around the pin 346, and the lock catch 34 remains stationary relative to the housing 1 during the movement of the connecting rod 32. Figure 8 The movement of the second leg 322 of the connecting rod 32 drives the latch 36 to move in a direction away from the support shaft 31, thereby pushing the transmission member 371 to pivot counterclockwise around the pin 373. Under the action of the transmission member 371, the contact spring 372 drives the moving contact 5 to move counterclockwise around the pin 373 to engage with the stationary contact 6.

[0073] During the closing period, when the moving contact 5 starts to rotate and approaches the stationary contact 6 but has not yet contacted the stationary contact 6, the second leg 322 of the connecting rod 32 will be blocked by the first blocking groove 331 of the damping 33 after moving for a period of time, and the connecting rod 32 temporarily stops moving under the bias of the damping spring 334. During this period, the moving contact 5 moves close to the stationary contact 6 but still has a certain safety distance from the stationary contact 6. When the connecting rod 32 temporarily stops moving and temporarily jams the support shaft 31, the handle 2 can still continue to rotate around the support arm 31 in the closing direction, so that the energy storage spring 23 is compressed and starts to store energy. Until the handle 2 rotates to its protrusion 21 (reference Fig.11) touches the second stop groove 332 of the damping 33, and the handle 2 continues to rotate in the closing direction to overcome the biasing force of the damping spring 334, and the damping 33 is pushed away by the protrusion 21, and the connecting rod 32 and the supporting shaft 31 are released. At this time, the kinetic energy accumulated in the energy storage spring 23 is released, and the moving contact 5 is thus quickly engaged with the static contact 6 at a faster speed, realizing the two-stage rapid closing of the single-pole circuit breaker 100.

[0074] The opening of the single-pole circuit breaker 100 can be achieved in a variety of ways, such as manual opening through the handle 2 under normal circuit conditions, and opening through a opening mechanism under abnormal circuit conditions, including opening through a short-circuit opening mechanism 7 under a short-circuit state, and opening through an overload opening mechanism 8 under a current overload state.

[0075] When manually opening the circuit breaker by the handle 2, it is only necessary to rotate the handle 2 in the opening direction opposite to the closing direction. The rotation of the handle 2 drives the connecting rod 32 to move synchronously through the energy storage spring 23 and the support shaft 31. The second leg 322 of the connecting rod 32 is pulled toward the support shaft 31 along the slide groove 341 of the lock catch 34, thereby pulling the latch 36. The movement of the latch 36 drives the transmission member 371 to rotate in the opposite direction around the pin 373, pulling the moving contact 5 away from the static contact 6. In order to speed up the opening speed, an opening spring 38 is connected between the first cantilever 303 of the first support plate 301 of the bracket 30 and the mounting arm 374 extending from the transmission member 371. During the closing and opening process of the single-pole circuit breaker 100, the opening spring 38 always applies a pulling force to the transmission member 371, thereby pulling the moving contact 5 to move rapidly in the opening direction.

[0076] The overload tripping mechanism 8 is installed in the housing 1 and is arranged corresponding to the first stop protrusion 351 of the tripping buckle 35. The overload tripping mechanism 8 can push the first stop protrusion 351 when the circuit current is overloaded, overcome the pulling force of the tripping buckle spring 354 and drive the tripping buckle 35 to pivot to the second state, and complete the disconnection with the lock buckle 34. When the tripping buckle 35 rotates to the second state, it will touch the protrusion 344 of the lock buckle 34, so that the lock buckle 34 is bounced and pivoted around the pin 346. At this time, the handle spring 22 can drive the handle 2 to pivot in the tripping direction, and then repeat the process similar to the above-mentioned manual tripping to achieve the tripping of the single-pole circuit breaker 100. In one embodiment, the overload tripping mechanism 8 includes a double gold sheet installed in the housing 1. When the circuit carries a large amount of current and causes temperature changes, the double gold sheet is deformed to push the first stop protrusion 351.

[0077] In the illustrated embodiment, the short-circuit tripping mechanism 7 includes an electromagnetic mechanism 71 installed corresponding to the moving contact 5 and a rocker 72 installed corresponding to the second stop protrusion 352 of the tripping latch 35. Figure 3 to Figure 4 , Figure 7 and Fig.15As shown, the sleeve 711 of the electromagnetic mechanism 71 is fixed in the housing 1, and the coil 712 is wound on the sleeve 711, wherein one end of the coil 712 is connected to the second static contact 62, and the other end of the coil 712 is connected to the second terminal 42. The trip rod 713 is movably arranged in the sleeve 711 along the axial direction, and both ends extend from the sleeve 711. In the sleeve 711, the yoke 714 is sleeved on the trip rod 713 on the side close to the moving contact 5 and fixed relative to the sleeve 711, and the armature 715 is sleeved on the trip rod 713 on the side away from the moving contact 5 and can move axially relative to the sleeve 711. A driving fit is formed between the armature 715 and the trip rod 713. A reset spring 716 is abutted between the trip rod 713 and the yoke 714. The rocker 72 is pivotally mounted to the pin 721, and the pin 721 is connected between the first support plate 301 and the second support plate 302 of the bracket 30. At the end of the trip lever 713 extending out of the sleeve 711 away from the moving contact 5, the rocker 72 forms a stopper fit with the trip lever 713. For example, the rocker 72 may be formed with a recess or a through hole, and the trip lever 713 extends from the recess or the through hole and is provided with a stopper flange, and the rocker 72 may be driven to move through the stopper flange.

[0078] The electromagnetic mechanism 71 can be arranged between the first stationary contact part 61 and the second stationary contact part 62 of the stationary contact 6, and the tripping rod 713 can extend from between the first stationary contact part 61 and the second stationary contact part 62 toward the moving contact 5. Once a short circuit occurs, the electromagnetic force generated by the short circuit current will drive the armature 714 to move close to the yoke 714, thereby driving the tripping rod 713 to move and knock open the moving contact 5. The movement of the tripping rod 713 in the direction close to the moving contact 5 will drive the rocker 72 to pivot around the pin 721, and the rocker 72 will push the second stop protrusion 352 of the tripping buckle 35, overcome the pulling force of the tripping buckle spring 354, and drive the tripping buckle 35 to pivot to the second state, thereby completing the disconnection with the lock buckle 34. When the tripping buckle 35 rotates to the second state, it will touch the protrusion 344 of the lock buckle 34, so that the lock buckle 34 is bounced up and pivoted around the pin 346. At this time, the handle spring 22 can drive the handle 2 to pivot along the opening direction, repeating a process similar to the above manual opening to achieve the opening of the single-pole circuit breaker 100.

[0079] The opening and closing state of the single-pole circuit breaker 100 can be transmitted to the outside world through the indicator 39. The housing 1 is formed with an indication window, and the indicator 39 includes an opening indication part 391 and a closing indication part 392. The opening indication part 391 and the closing indication part 392 can be aligned with the indication window respectively. In the embodiment shown, the opening indication part 391 is connected to the closing indication part 392, and the closing indication part 392 is rotatably arranged around a pivot fixed to the housing 1. The opening and closing indication state switching of the indicator 39 can be driven by the latch 36. For example, a receiving groove 362 can be formed in the latch 36, and a part of the closing indication part 392 can be embedded in the receiving groove 362. Thus, the movement of the latch 36 can drive the closing indication part 392 to pivot together with the opening indication part 391, so that the opening indication part 391 or the closing indication part 392 is aligned with the indication window respectively. The opening indicator 391 and the closing indicator 392 can be distinguished by color, for example, the opening indicator 391 is coated with a green coating, and the closing indicator 392 is coated with a red coating. Alternatively, the opening indicator 391 and the closing indicator 392 can also be distinguished by text.

[0080] In one embodiment, the indicator 39, such as the closing indicator portion 392, may have a positioning arm 393 extending therefrom to prevent the indicator 39 from tipping over during the pivoting process.

[0081] In this embodiment, the arc extinguishing mechanism 9 may arrange a group of arc extinguishing grids 91 corresponding to each breakpoint, and each group may include, for example, 10 arc extinguishing grids 91. In addition, corresponding to each breakpoint, arc striking plates are arranged on the upper and lower sides of each group of arc extinguishing grids 91, respectively, so as to form an arc striking channel corresponding to each breakpoint, which can effectively improve the arc extinguishing performance.

[0082] In one embodiment, magnetizing blocks can be arranged on opposite sides of each contact (for example, on opposite sides of the corresponding first stationary contact part and the first moving contact part, on opposite sides of the corresponding second stationary contact part and the second moving contact part), on opposite sides of each arc-strike channel and on opposite sides of each group of arc-extinguishing grids, and gas-generating sheets can be arranged on opposite sides of each contact (for example, on opposite sides of the corresponding first stationary contact part and the first moving contact part, on opposite sides of the corresponding second stationary contact part and the second moving contact part) and on opposite sides of each arc-strike channel.

[0083] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0084] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A single-pole circuit breaker, It is characterized in that include: Housing (1); A handle (2) pivotably mounted to the housing (1); The operating mechanism (3) is installed in the housing (1) and comprises: A bracket (30) fixed inside the housing (1); A connecting rod (32) movably mounted in the housing (1) and capable of being driven by the handle (2); a lock (34) pivotally mounted to the bracket (30) and movable relative to the connecting rod (32); A jump buckle (35) is pivotally mounted to the bracket (30) and has a first state of being locked with the lock buckle (34) to restrict the pivoting of the lock buckle (34) and a second state of being separated from the lock buckle (34); a latch (36) movably mounted in the housing (1) and actuable by the connecting rod (32); Contact mechanism, comprising: A stationary contact (6) fixed to the housing (1) and comprising a first stationary contact part (61) and a second stationary contact part (62); a movable contact (5) pivotally mounted to the bracket (30) and capable of being driven by the latch (36), the movable contact (5) comprising a first movable contact part (51) and a second movable contact part (52) connected in series, wherein the first movable contact part (51) can be engaged with or separated from the first stationary contact part (61), and the second movable contact part (52) can be engaged with or separated from the second stationary contact part (62); An arc extinguishing mechanism (9) is installed in the housing (1) corresponding to the contact mechanism.

2. The single-pole circuit breaker according to claim 1, It is characterized in that The operating mechanism (3) further comprises: A damper (33) pivotably mounted to the bracket (30), the damper (33) being configured to hinder the movement of the connecting rod (32) in a first closing stage and to be pushed to pivot by the handle (2) pivoting in a closing direction in a second closing stage; The damping spring (334) applies a force to the damping (33) to restore it.

3. The single-pole circuit breaker according to claim 1 or 2, It is characterized in that The single-pole circuit breaker (100) comprises: a support shaft (31) pivotably arranged relative to the bracket (30), wherein the handle (2) is pivotably engaged with the support shaft (31); An energy storage spring (23) abuts between the support shaft (31) and the handle (2); A handle spring (22) applies a force to the handle (2) to cause it to move in a direction of opening the switch; Wherein, the connecting rod (32) is coupled to the supporting shaft (31).

4. The single-pole circuit breaker according to claim 3, It is characterized in that The lock buckle (34) has a slide groove (341), and the connecting rod (32) has a first leg (321) engaged with the support shaft (31) and a second leg (322) inserted in the slide groove (341) and capable of moving along the slide groove (341), wherein a buckle (323) is connected between the first leg (321) and the second leg (322).

5. The single-pole circuit breaker according to claim 1 or 2, It is characterized in that The operating mechanism (3) comprises a transmission mechanism (37) pivotably connected to the bracket (30), wherein the transmission mechanism (37) is connected between the latch (36) and the moving contact (5).

6. The single-pole circuit breaker according to claim 5, It is characterized in that The transmission mechanism (37) comprises: a transmission member (371) pivotally mounted to the bracket (30) and pivotally connected to the latch (36); The contact spring (372) abuts between the transmission member (371) and the moving contact (5).

7. The single-pole circuit breaker according to claim 5, It is characterized in that A brake opening spring (38) is connected between the transmission member (371) and the bracket (30).

8. The single-pole circuit breaker according to claim 1 or 2, It is characterized in that The single-pole circuit breaker (100) comprises an overload tripping mechanism (8), wherein the overload tripping mechanism (8) is deformable to drive the tripping latch (35) to pivot toward the second state.

9. The single-pole circuit breaker according to claim 1 or 2, It is characterized in that The single-pole circuit breaker (100) comprises a short-circuit tripping mechanism (7), wherein the short-circuit tripping mechanism (7) comprises: An electromagnetic mechanism (71) is installed in the housing (1) and comprises a movable opening lever (713) arranged corresponding to the moving contact (5); The rocker (72) is pivotally mounted on the bracket (30) and can be driven by the trip lever (713) to push the trip button (35) to pivot toward the second state.

10. The single-pole circuit breaker according to claim 1 or 2, It is characterized in that The arc extinguishing mechanism (9) is installed in the housing (1) and is provided with a group of arc extinguishing grids (91) corresponding to the first stationary contact part (61) and the second stationary contact part (62).

11. A circuit breaker, It is characterized in that It is composed of a plurality of single-pole circuit breakers (100) connected in series, wherein each single-pole circuit breaker (100) is a single-pole circuit breaker as claimed in any one of claims 1 to 10.

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