Circuit breaker

Abstract

The circuit breaker comprises at least one circuit breaker pole, an operating mechanism, a contact mechanism and a short-circuit protection mechanism are arranged in the circuit breaker pole, the operating mechanism comprises a contact support, the contact mechanism comprises a moving contact and a static contact which are matched with each other, and the moving contact is connected with the contact support. The short circuit protection mechanism triggers the operation mechanism to trip through a tripping lever arranged in the circuit breaker pole, a rapid closing piece is further arranged in the circuit breaker pole, and the rapid closing piece and the tripping lever are coaxially and rotatably assembled between the contact support and the short circuit protection mechanism. The contact support and the rapid closing member firstly abut against each other and are limited and then relatively slide until separation, and the contact support drives the moving contact to rapidly rotate towards the closing direction. According to the utility model, the switching-on speed of the contact mechanism is improved by configuring the rapid switching-on piece, the service life is ensured, and meanwhile, the rapid switching-on piece and the tripping lever are coaxially assembled, thereby avoiding the need of additionally providing an assembly space due to the addition of the rapid switching-on piece, and improving the space utilization rate.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a circuit breaker. Background Art

[0002] In the field of low-voltage power transmission and distribution, circuit breakers are important components that perform on-off control and protection functions. During the closing process, the moving contact and the static contact need to be closed by manually or motor-driven operating mechanism movement, but the closing speed is related to the position and speed of the operating mechanism. In existing products, if a quick closing device (energy storage structure) is not provided, the closing speed is slow, especially in multi-pole products with poor synchronicity. During the closing process, the spark between the moving contact and the static contact lasts for a long time, causing severe ablation of one of the poles, and ultimately leading to the risk of phase loss, thereby affecting the service life. Summary of the invention

[0003] The purpose of the utility model is to overcome at least one defect of the prior art and provide a circuit breaker.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model provides a circuit breaker, comprising at least one circuit breaker pole, wherein an operating mechanism, a contact mechanism and a short-circuit protection mechanism are arranged inside the circuit breaker pole, wherein the operating mechanism comprises a contact support, wherein the contact mechanism comprises a movable contact and a stationary contact which cooperate with each other, wherein the movable contact is connected to the contact support, wherein the short-circuit protection mechanism triggers the operating mechanism to trip through a trip lever arranged inside the circuit breaker pole, wherein a quick closing member is arranged inside the circuit breaker pole, wherein the quick closing member and the trip lever are coaxially rotatably assembled between the contact support and the short-circuit protection mechanism,

[0006] During the closing process, the contact support and the rapid closing member first abut against each other to limit the position and then slide relative to each other until they are separated, and the contact support drives the moving contact to rotate rapidly in the closing direction.

[0007] Furthermore, the quick closing member and the tripping lever are an integrated structure.

[0008] Further, the quick closing member includes a locking portion, and the contact support is provided with a matching portion, and during the closing and rotating process of the contact support, the matching portion abuts against the locking portion, and the matching portion and the locking portion slide relative to each other;

[0009] The trip lever and / or the quick closing member are provided with an unlocking portion, and the trip lever is provided with a triggering portion. When a short circuit occurs, the short circuit protection mechanism drives the trip lever to rotate through the unlocking portion, and the trip lever triggers the operating mechanism to trip through the triggering portion.

[0010] Furthermore, the rapid closing member is also connected to a reset member for providing a reset force for the rapid closing member.

[0011] Further, the quick closing component includes a first connecting plate, a connecting hole is opened in the middle of the first connecting plate, the edge of the connecting hole protrudes from one side of the first connecting plate to form a connecting platform, one side wall of the first connecting plate protrudes outward and extends to form a crank arm serving as an unlocking part, the arc-shaped side wall on the other side of the first connecting plate serves as a locking part, the side wall of the first connecting plate connected between the locking part and the unlocking part is a straight side wall, and a positioning boss is provided at the connection between the locking part and the unlocking part.

[0012] Furthermore, the trip lever includes a second connecting plate, a connecting hole is opened in the middle of the second connecting plate, a side wall on one side of the second connecting plate protrudes outward to form a crank arm serving as an unlocking part, and the other side wall on the second connecting plate protrudes outward to form a bent rod serving as a triggering part.

[0013] Furthermore, the quick closing member and the tripping lever share a third connecting plate, a connecting hole is opened in the middle of the third connecting plate, the edge of the connecting hole protrudes from one side plate surface of the third connecting plate to form a connecting platform, one side wall of the third connecting plate protrudes outward and extends to form a crank arm serving as an unlocking part, and the other side wall of the third connecting plate is layered to form a first step surface and a second step surface, the first step surface extends outward to form a bent rod serving as a triggering part, and the arc-shaped side wall of the second step surface serves as a locking part, and a straight side wall of the second step surface is connected between the locking part and the unlocking part, and a positioning boss is provided at the connection between the second step surface and the unlocking part.

[0014] Furthermore, the short-circuit protection mechanism includes a yoke, an armature, an armature tension spring and a conductive plate, the conductive plate is arranged in the middle of the yoke, the first end of the armature is rotatably arranged, the second end of the armature is relatively matched with the yoke, the unlocking portion is relatively matched with the second end of the armature, one end of the armature tension spring is connected to the armature and the other end is fixedly arranged; the angle between the axis of the armature tension spring and the axis of the armature is an acute angle.

[0015] Furthermore, the circuit breaker pole also includes a handle mechanism, the contact support is rotatably arranged, the jumper and the lock are respectively rotatably installed on the contact support, the jumper and the lock are snap-fitted, and the jumper and the handle mechanism are connected through a second connecting rod, and an energy storage component is arranged between the contact support and the moving contact.

[0016] Furthermore, the energy storage component is a torsion spring, and a mounting groove is provided on one side of the contact support. The moving contact and the energy storage component are coaxially rotatably assembled in the mounting groove. The moving contact and the contact support are respectively provided with a first positioning portion and a second positioning portion. The two elastic energy storage arms of the energy storage component are respectively in contact with the first positioning portion and the second positioning portion. A convex shaft is provided near the edge area of ​​the contact support, and an arc-shaped linkage hole is provided on one side of the convex shaft. A notch is provided on the contact support near the convex shaft, and a blunt transition surface is formed on the edge end of the notch away from the convex shaft, and the transition surface serves as a mating portion.

[0017] Furthermore, the circuit breaker pole also includes a handle mechanism, and the operating mechanism includes a rotatably assembled rotating plate, on which a contact support, a trip buckle and a lock buckle are rotatably assembled respectively, wherein the trip buckle and the lock buckle are snap-fitted, the moving contact is connected to the contact support, and an energy storage spring is arranged between the contact support and the rotating plate, and a second connecting rod is connected between the handle mechanism and the trip buckle, and during the closing process, when the contact support and the quick closing member abut against each other and slide against each other, the contact support rotates relative to the rotating plate to store energy in the energy storage spring.

[0018] Furthermore, a handle mechanism is also provided in the circuit breaker pole, and the handle mechanism includes an operating member and a rotating member, a first connecting rod is connected between the operating member and the rotating member, at least two circuit breaker poles are linked together, a closing linkage shaft is linked between the rotating members of two adjacent circuit breaker poles, and a tripping linkage shaft is linked between the operating mechanisms of two adjacent circuit breaker poles.

[0019] The circuit breaker of the utility model improves the closing speed of the contact mechanism by configuring a quick closing member to ensure the service life. At the same time, the quick closing member is coaxially assembled with the tripping lever, avoiding the need to provide additional assembly space due to the addition of the quick closing member, thereby improving space utilization.

[0020] In addition, the quick closing member and the tripping lever can be a separate structure or an integrated structure, and have a wide range of applications.

[0021] In particular, the quick closing member and the tripping lever are an integrated structure, and one component has two functions: blocking the contact support to achieve quick closing and triggering the lock to achieve tripping of the operating mechanism when a fault occurs. It has the advantages of simple assembly and low cost.

[0022] In addition, two adjacent circuit breaker poles are respectively closed and tripped through the closing linkage shaft and the tripping linkage shaft, thereby improving the synchronization of the actions of multiple circuit breaker poles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the multi-pole circuit breaker of the utility model;

[0024] Figure 2It is a schematic diagram of the internal structure of the circuit breaker pole in the utility model;

[0025] Figure 3 It is a schematic diagram of the internal structure of the circuit breaker pole in the utility model (front view);

[0026] Figure 4 It is a schematic diagram of the internal structure of the circuit breaker pole in the utility model (reverse side);

[0027] Figure 5 It is a schematic diagram of the structure of the contact support in the utility model;

[0028] Figure 6 It is a structural schematic diagram of the rapid closing member in the utility model;

[0029] Figure 7 It is a structural schematic diagram of the rapid closing member in the utility model (third connector);

[0030] Figure 8 It is a structural schematic diagram of the rotating part in the utility model;

[0031] Reference numerals:

[0032] 1-circuit breaker pole, 10-housing, 101-operating end, 102-plug-in end, 11-closing linkage shaft, 12-tripping linkage shaft, 2-handle mechanism, 21-operating member, 22-rotating member, 23-first connecting rod, 24-second connecting rod, 3-operating mechanism, 31-contact support, 311-matching part, 312-convex shaft, 313-arc linkage hole, 314-notch, 32-jump buckle, 33 -lock, 34-trip lever, 35-quick closing part, 3a-connecting hole, 3b-locking part, 3c-unlocking part, 3d-positioning boss, 3e-straight side wall, 3f-connecting platform, 3g-trigger part, 36-energy storage part, 37-reset part, 41-moving contact, 42-static contact, 5-short-circuit protection mechanism, 6-overload protection mechanism, 7-arc extinguishing system, 81-connecting terminal, 82-busbar clamp. DETAILED DESCRIPTION

[0033] The following is a further description of the specific implementation of the circuit breaker of the present utility model in conjunction with the embodiments given in the accompanying drawings. The circuit breaker of the present utility model is not limited to the description of the following embodiments.

[0034] like Figure 1-4As shown, the circuit breaker includes at least one circuit breaker pole 1, each circuit breaker pole 1 is provided with a pair of wiring components and an operating mechanism 3, a contact mechanism is connected between the pair of wiring components, the contact mechanism includes a moving contact 41 and a stationary contact 42 that cooperate with each other, the operating mechanism 3 is drivingly connected to the moving contact 41, the operating mechanism 3 is linked to a handle mechanism 2 arranged inside the circuit breaker pole 1, the operating member 21 of the handle mechanism 2 extends to the outside of the circuit breaker pole 1 for manually operating the circuit breaker pole 1 to open and close, of course, the operating mechanism 3 can also be linked to an electric operating mechanism arranged inside the circuit breaker pole 1, the motor of the electric operating mechanism (not shown) drives the circuit breaker pole 1 to automatically open and close according to the received control signal, an arc extinguishing mechanism 7 is provided on one side of the contact mechanism, and the arc extinguishing mechanism 7 extinguishes the arc generated by the contact mechanism breaking, when the number of circuit breaker poles 1 is two or more, two adjacent circuit breaker poles 1 are arranged in parallel, and the handle mechanisms 2 and operating mechanisms 3 of the two adjacent circuit breaker poles 1 are linked and connected respectively through two linkage shafts.

[0035] A short-circuit protection mechanism 5 and an overload protection mechanism 6 are also provided inside each circuit breaker pole 1. The short-circuit protection mechanism 5 is connected between a wiring assembly and a contact mechanism. A tripping lever 34 is rotatably mounted between the short-circuit protection mechanism 5 and the operating mechanism 3. When a short-circuit fault occurs, the short-circuit protection mechanism 5 drives the tripping lever 34 to trigger the operating mechanism 3 to trip, thereby achieving short-circuit protection; the overload protection mechanism 6 is connected between a wiring assembly and the contact mechanism. When an overload fault occurs, the overload protection mechanism 6 drives the operating mechanism 3 to trip, thereby achieving overload protection.

[0036] Specifically, Figure 2-4 As shown in Figure 8, the operating mechanism 3 includes a rotatably assembled contact support 31, and the moving contact 41 is connected to the contact support 31. For example, the moving contact 41 and the contact support 31 are coaxially rotatably assembled, and an energy storage member 36 is arranged between the two. Alternatively, the moving contact 41 is connected to the contact support 31, and the moving contact 41 is directly driven by the contact support 31; the operating mechanism 3 also includes a trip buckle 32 and a lock buckle 33, wherein the trip buckle 32 and the lock buckle 33 are respectively rotatably assembled, and one end of the trip buckle 32 and the lock buckle 33 are snap-fitted, and the trip lever 34 and the overload protection mechanism 6 are respectively matched with the lock buckle 33, and the lock buckle 33 is driven to rotate. 3 releases the snap fit with the trip button 32, so that the operating mechanism 3 is tripped to drive the moving contact 41 and the static contact 42 to separate, thereby realizing tripping and power off; the handle mechanism 2 includes an operating member 21 and a rotating member 22, wherein the operating member 21 is assembled in the operating hole of the circuit breaker pole 1, one end of the operating member 21 extends from the operating hole to the outside of the circuit breaker pole 1, the rotating member 22 is rotatably arranged in the circuit breaker pole 1 between the operating mechanism 3 and the operating member 21, a first connecting rod 23 is connected between the operating member 21 and the rotating member 22, a second connecting rod 24 is connected between the rotating member 22 and the contact support 31, and the rotating member 22 can be connected to the electric operating mechanism.

[0037] The improvement of the present application is that a quick closing component 35 is also provided inside each circuit breaker pole 1, and the quick closing component 35 and the tripping lever 34 are coaxially rotatably assembled between the contact support 31 and the short-circuit protection mechanism 5. During the closing process, the contact support 31 and the quick closing component 35 first abut against a limit position and then slide relative to each other until they are separated, and the contact support 31 drives the moving contact 41 to rotate quickly in the closing direction.

[0038] In this way, the closing speed of the contact mechanism is improved by configuring the quick closing member 35 to ensure the service life. At the same time, the quick closing member 35 is coaxially assembled with the tripping lever 34, avoiding the need for additional assembly space due to the addition of the quick closing member 35, thereby improving space utilization.

[0039] Specifically, the quick closing member 35 includes a locking portion 3b and an unlocking portion 3c, and the contact support 31 is provided with a matching portion 311. In the process of the contact support 31 driving the moving contact 41 to rotate in the closing direction, the matching portion 311 abuts against the locking portion 3b. It can also be understood that the rotational force received by the matching portion 311 is smaller than the friction force between the matching portion 311 and the locking portion 3b, so that the contact support 31 and the quick closing member 35 abut first. When a larger operating force is applied to the operating member 21, the rotational force received by the matching portion 311 is greater than the friction force between the matching portion 311 and the locking portion 3b, and the matching portion 311 and the locking portion 3b slide relative to each other until they are separated from each other; the coaxially assembled tripping lever 34 is provided with a triggering portion 3g and an unlocking portion 3c, wherein the unlocking portions 3c of the quick closing member 35 and the tripping lever 34 are respectively matched with the short-circuit protection mechanism 5, and the triggering portion 3g is used to push the lock 33 to rotate toward the operating mechanism 3.

[0040] Furthermore, the quick closing member 35 and the tripping lever 34 are an integrated structure, that is, the quick closing member 35 is provided with a triggering portion 3g for triggering the operating mechanism 3 to trip, in addition to the locking portion 3b and the unlocking portion 3c. The triggering portion 3g drives the lock 33 of the operating mechanism 3 to rotate. The quick closing member 35 and the tripping lever 34 adopt an integrated structure, and one component simultaneously realizes two functions of quick closing and triggering the lock 33 to realize the tripping of the operating mechanism in the event of a fault, and has the advantages of simple assembly and low cost.

[0041] Combination Figure 1-8 An embodiment of a circuit breaker is provided, wherein the circuit breaker is a plug-in circuit breaker as an example.

[0042] like Figure 1As shown, the circuit breaker includes a plurality of circuit breaker poles 1 arranged in parallel, each circuit breaker pole 1 includes a shell 10, and opposite ends of the shell 10 are respectively used as an operating end 101 and a plug-in end 102, the operating end 101 is provided with a wiring hole and an operating hole, and the plug-in end 102 is provided with a socket, and a pair of wiring components arranged in the shell 10 are respectively a wiring terminal 81 and a busbar clamp 82, wherein the wiring terminal 81 is correspondingly arranged at the operating end 101, the wiring terminal 81 and the wiring hole are used for wiring, the busbar clamp 82 is arranged at the plug-in end 102 and cooperates with the socket, and the busbar clamp 82 is clamped and connected with the external wire by plugging and unplugging the circuit breaker.

[0043] An operating mechanism 3, a contact mechanism and an arc extinguishing mechanism 7 are arranged in sequence between the wiring terminal 81 and the busbar clamp 82. The contact mechanism is electrically connected between the busbar clamp 82 and the wiring terminal 81. An overload protection mechanism 6 is arranged on one side of the operating mechanism 3. When an overload fault occurs, the overload protection mechanism 6 triggers the operating mechanism 3 to trip. The arc extinguishing mechanism 7 is arranged side by side with the short-circuit protection mechanism 5 arranged in the housing 10. Figure 2-4 In the figure, the overload protection mechanism 6 and the short-circuit protection mechanism 5 are respectively arranged on opposite sides of the housing 10, and a trip lever 34 is rotatably installed between the short-circuit protection mechanism 5 and the operating mechanism 3. When a short-circuit fault occurs, the short-circuit protection mechanism 5 triggers the trip lever 34 to rotate, and the trip lever 34 triggers the lock 33 of the operating mechanism 3 to rotate to release the snap fit with the jump buckle 32, and the short-circuit protection mechanism 5 triggers the operating mechanism 3 to trip through the trip lever 34.

[0044] A specific embodiment of an operating mechanism is provided in conjunction with the figure, such as Figure 2-5As shown, the operating mechanism 3 includes a rotatably assembled contact support 31, a jumper 32 and a lock catch 33 are respectively rotatably mounted on the contact support 31, the jumper 32 is snap-fitted with the lock catch 33, and the jumper 32 is connected to the handle mechanism 2 through a second connecting rod 24, the contact mechanism includes a moving contact 41 and a stationary contact 42 that cooperate with each other, the moving contact 41 is coaxially rotatably assembled with the contact support 31, the stationary contact 42 is fixedly arranged in the housing 10, and the stationary contact 42 and the overload protection mechanism 6 are located on the same side of the housing 10, one end of the moving contact 41 is drivingly matched with the contact support 31, and an energy storage member 36 is arranged between the moving contact 41 and the contact support 31, the energy storage member 36 is preferably a torsion spring, and the two elastic energy storage arms of the energy storage member 36 are respectively in contact with the moving contact 41 and the contact support 31; the moving contact 4 1 cooperates with a static contact 42 fixedly arranged in the housing 10, and a handle mechanism 2 is connected to the contact support 31, and the handle mechanism 2 corresponds to the operating end 101, so that the operating member 21 of the handle mechanism 2 extends out from the operating hole correspondingly, and is used to manually drive the contact support 31 to drive the moving contact 41 to perform opening and closing actions. Of course, the contact support 31 can also be linked with the electric operating mechanism, and the motor of the electric operating mechanism drives the contact support 31 to rotate for opening and closing after receiving the control signal; a jump buckle 32 and a lock buckle 33 are also rotatably assembled on one side of the contact support 31 facing away from the energy storage member 36, and the jump buckle 32 and one end of the lock buckle 33 are snap-fitted, and the overload protection mechanism 6 and the tripping lever 34 are respectively matched with the lock buckle 33, and the snap-fitting of the jump buckle 32 and the lock buckle 33 is disintegrated by driving the lock buckle 33 to rotate.

[0045] During the closing process, when the contact support 31 first abuts against the fast closing member 35 during the closing rotation process, when a greater operating force is applied, the rotational force applied to the contact support 31 is greater than the friction between the contact support 31 and the fast closing member 35, and the contact support 31 and the fast closing member 35 slide against each other until they are separated. During this process, the moving contact 41 moves synchronously with the contact support 31, and the two are relatively stationary, and the energy storage member 36 does not store energy; when the operating force is increased, the driving contact support 31 drives the moving contact 41 to rotate rapidly in the closing direction, thereby improving the closing speed of the contact mechanism. This embodiment does not require spring energy storage, and the operating force is increased by the blocking limit of the contact support 31 by the fast closing member 35. When the contact support 31 is separated from the fast closing member 35, the blocking force suddenly disappears, thereby achieving rapid closing, without changing the existing structure or adding additional components, and the structure is simple and the cost is low.

[0046] Another embodiment of the operating mechanism 3 is provided. The operating mechanism 3 includes a rotating plate (not shown) that is rotatably assembled, on which a contact support 31, a trip button 32 and a lock button 33 are respectively rotatably assembled, wherein the trip button 32 and the lock button 33 are snap-fitted, the moving contact 41 is connected to the contact support 31, an energy storage spring is arranged between the contact support 31 and the rotating plate, the second connecting rod 24 is connected to the handle mechanism 2 and the trip button 32, and one end of the second connecting rod 24 passes through the trip button 32 and is connected to the rotating plate, the handle mechanism 2 corresponds to the operating end 101, so that the operating member 21 of the handle mechanism 2 extends out from the operating hole correspondingly, and is used to manually drive the contact support 31 to drive the moving contact 41 to perform opening and closing actions.

[0047] During the closing process, when the contact support 31 first abuts against the quick closing component 35 during the closing rotation process, that is, the rotational force applied by the rotating plate to the contact support 31 is less than the friction between the contact support 41 and the quick closing component 35. At this time, the contact support 31 rotates relative to the rotating plate to store energy in the energy storage spring. When a larger operating force is applied, the rotational force applied by the rotating plate to the contact support 31 is greater than the friction between the contact support 31 and the quick closing component 35. The contact support 31 and the quick closing component 35 slide against each other until they are separated. The energy storage spring releases energy after the contact support 31 is separated from the quick closing component 35. Therefore, under the combined force of the operating force and the release capacity of the energy storage spring, the contact support 31 drives the moving contact 41 to rotate rapidly in the closing direction, thereby improving the closing speed of the contact mechanism.

[0048] Preferably, in the above-mentioned operating mechanism 3 , the contact support 31 is further provided with a reset spring, which may be a tension spring. The reset spring is connected between the contact support housing 10 and the contact support 31 to provide a reset force for the contact support 31 .

[0049] In the above-mentioned operating mechanism 3, the operating member 21 is a slidingly assembled button, and the contact mechanism can be driven to close or open by pressing or pulling the operating member 21. As another embodiment, the operating member 21 can be a rotatably assembled handle, one end of the handle extends out of the operating hole, and the rotating handle drives the rotating member 22, thereby driving the contact mechanism to open and close; or the rotating member 22 is close to the operating end, and the rotating member 22 is radially fixedly connected with a protruding operating member 21, and the rotating member 22 is driven to rotate by the operating member 21.

[0050] In the above-mentioned operating mechanism 3, the contact support 31 is also provided with a matching portion 311, and a quick closing member 35 is further provided between the operating mechanism 3 and the short-circuit protection mechanism 5. The quick closing member 35 is provided with a locking portion 3b and an unlocking portion 3c. The locking portion 3b and the unlocking portion 3c respectively cooperate with the matching portion 311 and the short-circuit protection mechanism 5. When the contact support 31 is manually or electrically operated to rotate for closing, the contact support 31 first drives the moving contact 41 to rotate in the closing direction. When the locking portion 3b of the quick closing member 35 abuts against the matching portion 311 of the contact support 31, and when the locking portion 3b and the matching portion 311 are kept in abutment (equivalent to the matching portion 311 being pressed against the The rotational force is smaller than the frictional force between the locking portion 3b and the matching portion 311). When a larger operating force is applied, the contact support 31 continues to rotate in the closing direction relative to the moving contact 41, causing relative sliding between the matching portion 311 and the locking portion 3b (equivalent to the rotational force on the matching portion 311 being greater than the frictional force between the matching portion 311 and the locking portion 3b). The moving contact 41 is driven by the contact support 31 to rotate quickly in the closing direction, thereby improving the closing speed of the contact mechanism; the unlocking portion 3c cooperates with the short-circuit protection mechanism 5. When a short-circuit fault occurs, the unlocking portion 3c of the quick closing member 35 is used to maintain consistency of action with the tripping lever 34.

[0051] Combination Figure 2-5 A structure of a contact support 31 used in the operating mechanism 3 is provided.

[0052] like Figure 5 As shown, the contact support 31 includes a body, which is a plate-like structure with a certain thickness. An assembly hole penetrating through the two side panels is opened in the middle of the body, and the edge of the assembly hole protrudes axially from one side panel of the body to form a connecting shaft. A ring-shaped protrusion surrounding the outside of the connecting shaft is provided on one side surface of the body, and the ring-shaped protrusion forms a mounting groove surrounding the outside of the connecting shaft between the connecting shafts. The moving contact 41 is coaxially rotatably assembled with the energy storage member 36 in the mounting groove and rotates around the connecting shaft; a second positioning portion is provided in the edge area of ​​the body, and the second positioning portion and the mounting groove are located on the same side panel of the body. The second positioning portion is a raised structure, and one end of the moving contact 41 extends to one side of the second positioning portion. A first positioning portion opposite to the second positioning portion is provided on the moving contact 41, and two elastic energy storage arms of the energy storage member 36 are respectively abutted against the first positioning portion and the second positioning portion.

[0053] The other side of the body is provided with a protruding shaft 312. Figure 5In the embodiment, the convex shaft 312 is located near the edge of the body, and an arc-shaped linkage hole 313 is provided on one side of the convex shaft 312. The second connecting rod 24 in the handle mechanism 2 drives the contact support 31 to rotate through the arc-shaped linkage hole 313. The jumper 32 is rotatably arranged on the convex shaft 312, and the lock buckle 33 is coaxially rotatably assembled with the contact support 31. The jumper 32 and the lock buckle 33 are located on the side of the contact support 31 facing away from the moving contact 41. The jumper 32 and one end of the lock buckle 33 are snap-fitted, and the other end of the lock buckle 33 is provided with a tripping part, which is used to cooperate with the overload protection mechanism 6 and the trigger part 3g of the tripping lever 34.

[0054] A notch 314 is formed on one edge of the body. The notch 314 is located on one side of the protruding shaft 312. Figure 5 The middle notch 314 is V-shaped, and a blunt transition surface is formed by the edge end of the notch 314 away from the protruding shaft 312. The transition surface serves as a matching portion 311 for contacting with the locking portion 3b. Figure 2-4 6 provides a structure of a quick closing member 35 applied to the above-mentioned operating mechanism 3, wherein the quick closing member 35 and the tripping lever 34 are separate structures, such as Figure 6 As shown, the quick closing member 35 includes a first connecting plate, a connecting hole 3a is opened in the middle of the first connecting plate, and the edge of the connecting hole 3a protrudes from one side of the first connecting plate to form a connecting platform 3f. Figure 6 The middle connecting platform 3f is annular, and the side wall on one side of the first connecting plate protrudes outward to form a crank arm serving as the unlocking portion 3c. The arc-shaped side wall on the other side of the first connecting plate serves as the locking portion 3b. The locking portion 3b has a certain curvature, and the side wall of the first connecting plate connected between the locking portion 3b and the unlocking portion 3c is a straight side wall 3e, which not only ensures the abutment with the matching portion 311, but also facilitates relative sliding when the locking portion 3b and the matching portion 311 are separated. A positioning boss 3d is provided at the connection between the locking portion 3b and the unlocking portion 3c, and a card groove is provided on one side of the positioning boss 3d. The positioning boss 3d and the connecting platform 3f are located on the same side of the first connecting plate.

[0055] like Figure 4 As shown, the trip lever 34 includes a second connecting plate, a connecting hole 3a is opened in the middle of the second connecting plate, one side wall of the second connecting plate protrudes outward and extends to form a crank arm serving as an unlocking portion 3c, and the unlocking portion 3c of the trip lever 34 is the same shape as the unlocking portion 3c of the quick closing member 35, and the other side wall of the second connecting plate protrudes outward and extends to form a bent rod serving as a triggering portion 3g, and the triggering portion 3g is opposite to the lock 33 of the operating mechanism 3. In this embodiment, the trip lever 34 and the quick closing member 35 are coaxially assembled between the short-circuit protection mechanism 5 and the operating mechanism 3 through their respective connecting holes 3a, and the trip lever 34 and the unlocking portion 3c of the quick closing member 35 cooperate with the short-circuit protection mechanism 5, and the unlocking portion 3c can contact the armature of the short-circuit protection mechanism 5 or leave a small gap.

[0056] Furthermore, the split quick closing component 35 and the tripping lever 34 can be linked and connected. For example, a linkage structure is provided between the tripping lever 34 and the quick closing component 35. The linkage structure can be a slot and a plug-in part that are plugged into each other. At this time, only one unlocking part 3c can be provided, that is, the unlocking part 3c is provided on the quick closing component 35 or the tripping lever 34.

[0057] Combination Figure 2-4 7 provides another structure of the quick closing member 35 applicable to the above-mentioned operating mechanism 3, such as Figure 7 As shown, the quick closing member 35 and the tripping lever 34 are an integrated structure, that is, the quick closing member 35 and the tripping lever 34 share a third connecting plate, and a connecting hole 3a is opened in the middle of the third connecting plate, through which it can be rotatably assembled between the short-circuit protection mechanism 5 and the operating mechanism 3, the edge of the connecting hole 3a protrudes from one side of the third connecting plate to form a connecting platform 3f, the connecting platform 3f is preferably an annular boss, one side wall of the third connecting plate protrudes outward and extends to form a crank arm as an unlocking portion 3c, the other side wall of the third connecting plate is layered to form a first step surface and a second step surface, the first step surface extends outward to form a bent rod as a triggering portion 3g, the arcuate side wall of the second step surface serves as a locking portion 3b, a straight side wall 3e of the second step surface is connected between the locking portion 3b and the unlocking portion 3c, a positioning boss 3d is provided at the junction of the second step surface and the unlocking portion 3c, in the figure, the positioning boss 3d and the connecting platform 3f are located on the same side of the third connecting plate.

[0058] In this embodiment, if Figure 3 As shown, the quick closing member 35 is also connected to a reset member 37. Preferably, the reset member 37 is a torsion spring. The reset member 37 includes a twisted portion, and both ends of the twisted portion extend outward to form two elastic arms. The twisted portion is coaxially rotatably assembled with the quick closing member 35, that is, the twisted portion is sleeved on the connecting platform 3f, one of the elastic arms is inserted into the slot of the positioning boss 3d, and the other elastic arm abuts against the shell 10. After the reset member 37 is deformed, it is used to provide a reset force for the quick closing member 35.

[0059] Preferably, a positioning structure is provided on the housing 10, and the trip lever 34 and the quick closing member 35 are coaxially rotatably assembled on the positioning structure, and the positioning structure can limit the movement trajectory of the trip lever 34 and the quick closing member 35, and the positioning structure can be a convex shaft structure.

[0060] Combination Figure 4A short-circuit protection mechanism 5 applied to the present embodiment is provided. The short-circuit protection mechanism 5 of the present embodiment adopts a snap-fit ​​short-circuit protection mechanism 5. The short-circuit protection mechanism 5 includes a yoke, an armature, an armature tension spring and a conductive plate. The conductive plate is arranged in the middle of the yoke. The first end of the armature is rotatably arranged. The second end of the armature is relatively matched with the yoke. The unlocking portion 3c is matched with the second end of the armature. That is, when the quick closing member 35 and the tripping lever 34 are split structures, the unlocking portions 3c of the quick closing member 35 and the tripping lever 34 are both matched with the second end of the armature. When the quick closing member 35 and the tripping lever 34 are an integrated structure, the unlocking portion 3c thereof is matched with the second end of the armature. One end of the armature tension spring is connected to the armature and the other end is fixedly arranged. The angle between the axis of the armature tension spring and the axis of the armature is an acute angle. Of course, as other embodiments, the short-circuit protection mechanism 5 can also be an electromagnetic release.

[0061] Furthermore, in the short-circuit protection mechanism 5, the angle between the axis of the armature tension spring and the axis of the armature is an acute angle, so that during the attraction process of the armature and the yoke, the stretching increase (or tension increase) of the armature tension spring is small, which is conducive to the rapid attraction of the armature and the yoke, thereby improving the breaking capacity of the small circuit breaker.

[0062] Combination Figure 2-4 An overload protection mechanism 6 applied to the present embodiment is provided, the overload protection mechanism 6 includes a first conductive plate, a first connecting plate and a bimetallic strip, the two ends of the first connecting plate are respectively connected to the first conductive plate and the bimetallic strip, the bimetallic strip is connected to the first conductive plate through a first soft connection and to the static contact 42 through a second soft connection, a third soft connection can be optionally provided between the first conductive plate and the static contact 42, when the overload protection mechanism 6 is used for small current specifications (current value of 63A and below), the third soft connection is not provided between the first conductive plate and the static contact 42 to meet the heating requirements of the bimetallic strip, when the overload protection mechanism 6 is used for large current specifications (current value of more than 63A), the first conductive plate and the static contact 42 are connected through the third soft connection, which not only guarantees the heating requirements of the bimetallic strip, but also guarantees the current cutting section requirements of the soft connection.

[0063] One end of the first connecting plate is connected to the middle of the first conductive plate, and the other end is connected to one end of the bimetallic strip, and the other end of the bimetallic strip cooperates with the release portion of the lock 33; an adjusting screw is also threadedly connected to the first connecting plate, and one end of the adjusting screw is relatively matched with the first connecting plate. The adjusting screw is arranged on the first conductive plate. Compared with the prior art method of arranging the adjusting screw on the housing 10, this avoids the change in the position of the adjusting screw due to thermal deformation of the housing 10, which leads to instability of the overload characteristics of the circuit breaker.

[0064] It should be pointed out that the first connecting plate is generally made of standard materials such as brass and carbon steel, has a large internal resistance and is relatively long, has a certain elasticity, and can well withstand the force given by the adjusting screw, thereby adjusting the position of the bimetallic strip to adjust the overload characteristics of the circuit breaker; the first soft connection, the second soft connection and the third soft connection are made of good conductors, which have the characteristics of short length, large cross-section and small internal resistance, forming three current channels to carry most of the current.

[0065] It should be noted that, in the present embodiment, the wiring components in each circuit breaker pole 1, the remaining structures of the operating mechanism 3 except the contact support 31, the contact mechanism, the arc extinguishing mechanism 7, the overload protection mechanism 6 and the short-circuit protection mechanism 5 can all adopt the existing technology, and an electric operating mechanism is configured in one of the circuit breaker poles 1, or a separate electric operating mechanism is configured to drive the contact 41 mechanism to automatically open and close.

[0066] In this embodiment, two adjacent circuit breaker poles 1 are linked and connected, specifically, the operating members 21 of the two adjacent circuit breaker poles 1 are linked and connected outside the housing 10, a closing linkage shaft 11 is linked and connected between the rotating members 22 of the two adjacent circuit breaker poles 1, and a tripping linkage shaft 12 is linked and connected between the operating mechanisms 3 of the two adjacent circuit breaker poles 1, that is, the two locks 33 are linked through the tripping linkage shaft 12, and correspondingly, holes for the closing linkage shaft 11 and the tripping linkage shaft 12 to pass through are opened on the housing 10 of the circuit breaker pole 1.

[0067] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0068] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit breaker, comprising at least one circuit breaker pole (1), wherein an operating mechanism (3), a contact mechanism and a short-circuit protection mechanism (5) are arranged inside the circuit breaker pole (1), wherein the operating mechanism (3) comprises a contact support (31), wherein the contact mechanism comprises a movable contact (41) and a stationary contact (42) that cooperate with each other, wherein the movable contact (41) is connected to the contact support (31), and wherein the short-circuit protection mechanism (5) triggers the operating mechanism (3) to trip via a trip lever (34) arranged inside the circuit breaker pole (1), wherein: A quick closing member (35) is also provided inside the circuit breaker pole (1), and the quick closing member (35) and the trip lever (34) are coaxially rotatably assembled between the contact support (31) and the short-circuit protection mechanism (5). During the closing process, the contact support (31) and the quick closing member (35) first abut against each other to limit the position and then slide relative to each other until they are separated, and the contact support (31) drives the moving contact (41) to rotate rapidly in the closing direction.

2. The circuit breaker according to claim 1, characterized in that: The quick closing member (35) and the tripping lever (34) are an integrated structure.

3. The circuit breaker according to claim 1, characterized in that: The quick closing member (35) comprises a locking portion (3b), and the contact support (31) is provided with a matching portion (311). During the closing and rotating process of the contact support (31), the matching portion (311) abuts against the locking portion (3b), and the matching portion (311) and the locking portion (3b) slide relative to each other. The trip lever (34) and / or the quick closing member (35) are provided with an unlocking portion (3c), and the trip lever (34) is provided with a triggering portion (3g). When a short circuit occurs, the short circuit protection mechanism (5) drives the trip lever (34) to rotate via the unlocking portion (3c), and the trip lever (34) triggers the operating mechanism (3) to trip via the triggering portion (3g).

4. The circuit breaker according to claim 1, characterized in that: The quick closing member (35) is also connected to a reset member (37) for providing a reset force for the quick closing member (35).

5. The circuit breaker according to claim 1, characterized in that: The quick closing member (35) comprises a first connecting plate, a connecting hole (3a) is provided in the middle of the first connecting plate, an edge of the connecting hole (3a) protrudes from a side plate surface of the first connecting plate to form a connecting platform (3f), a side wall of one side of the first connecting plate protrudes outward to form a crank arm serving as an unlocking portion (3c), an arc-shaped side wall on the other side of the first connecting plate serves as a locking portion (3b), a side wall of the first connecting plate connected between the locking portion (3b) and the unlocking portion (3c) is a straight side wall (3e), and a positioning boss (3d) is provided at the connection between the locking portion (3b) and the unlocking portion (3c).

6. The circuit breaker according to claim 1, characterized in that: The trip lever (34) comprises a second connecting plate, a connecting hole (3a) is provided in the middle of the second connecting plate, a side wall of one side of the second connecting plate protrudes outwardly to form a crank arm serving as an unlocking portion (3c), and a side wall of the other side of the second connecting plate protrudes outwardly to form a bent rod serving as a trigger portion (3g).

7. The circuit breaker according to claim 2, characterized in that: The quick closing member (35) and the tripping lever (34) share a third connecting plate, a connecting hole (3a) is provided in the middle of the third connecting plate, an edge of the connecting hole (3a) protrudes from a side plate surface of the third connecting plate to form a connecting platform (3f), a side wall of one side of the third connecting plate protrudes outwards and extends to form a crank arm as an unlocking portion (3c), and the other side wall of the third connecting plate is layered to form a first step surface and a second step surface, the first step surface extends outwards to form a bent rod as a triggering portion (3g), and the arc-shaped side wall of the second step surface serves as a locking portion (3b), a straight side wall (3e) of the second step surface is connected between the locking portion (3b) and the unlocking portion (3c), and a positioning boss (3d) is provided at the connection between the second step surface and the unlocking portion (3c).

8. The circuit breaker according to claim 5, 6 or 7, characterized in that: The short-circuit protection mechanism (5) comprises a yoke, an armature, an armature tension spring and a conductive plate, wherein the conductive plate is arranged in the middle of the yoke, the first end of the armature is rotatably arranged, the second end of the armature is relatively matched with the yoke, the unlocking portion (3c) is relatively matched with the second end of the armature, one end of the armature tension spring is connected to the armature and the other end is fixedly arranged; the angle between the axis of the armature tension spring and the axis of the armature is an acute angle.

9. The circuit breaker according to claim 1, characterized in that: The circuit breaker pole also includes a handle mechanism (2), the contact support (31) is rotatably arranged, the trip buckle (32) and the lock buckle (33) are respectively rotatably mounted on the contact support (31), the trip buckle (32) and the lock buckle (33) are snap-fitted, and the trip buckle (32) and the handle mechanism (2) are connected via a second connecting rod (24), and an energy storage component (36) is arranged between the contact support (31) and the moving contact (41).

10. The circuit breaker according to claim 9, characterized in that: The energy storage member (36) is a torsion spring. A mounting groove is provided on one side of the contact support (31). The moving contact (41) and the energy storage member (36) are coaxially rotatably assembled in the mounting groove. The moving contact (41) and the contact support (31) are respectively provided with a first positioning portion and a second positioning portion. The two elastic energy storage arms of the energy storage member (36) are respectively in contact with the first positioning portion and the second positioning portion. A convex shaft (312) is provided near the edge region of the contact support (31). An arc-shaped linkage hole (313) is provided on one side of the convex shaft (312). A notch (314) is provided on the contact support (31) near the convex shaft (312). The edge end of the notch (314) on one side away from the convex shaft (312) forms a blunt transition surface, and the transition surface serves as a matching portion (311).

11. The circuit breaker according to claim 1, characterized in that: The circuit breaker pole also includes a handle mechanism (2), the operating mechanism (3) includes a rotatably assembled rotating plate, on which a contact support (31), a trip button (32) and a lock button (33) are rotatably assembled, respectively, wherein the trip button (32) and the lock button (33) are snap-fitted, the moving contact (41) is connected to the contact support (31), an energy storage spring is arranged between the contact support (31) and the rotating plate, a second connecting rod (24) is connected between the handle mechanism (2) and the trip button (32), and during the closing process, when the contact support (31) and the quick closing member (35) abut against each other and slide against each other, the contact support (31) rotates relative to the rotating plate to store energy in the energy storage spring.

12. The circuit breaker according to claim 1, characterized in that: A handle mechanism (2) is also provided in the circuit breaker pole (1), the handle mechanism (2) comprising an operating member (21) and a rotating member (22), a first connecting rod (23) being connected between the operating member (21) and the rotating member (22), at least two circuit breaker poles (1) being linked together, a closing linkage shaft (11) being linked together between the rotating members (22) of two adjacent circuit breaker poles (1), and a tripping linkage shaft (12) being linked together between the operating mechanisms (3) of two adjacent circuit breaker poles (1).

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