A circuit breaker

Abstract

The invention relates to an improvement of a tripping mechanism of the circuit breaker, and specifically designs an improvement of the tripping mechanism of the circuit breaker, and utilizes the Holm force and the Lorentz magnetic force generated by a short-circuit current to quickly repel a moving contact. When the moving contact is repelled, the repelled movement of the moving contact is utilized to design a tripping combined structure transmission so that a tripping half-shaft and a jumper piece are directly unfastened, thereby shortening the mechanism response time, improving the ability to cut off the fault current, and reducing the impact of the fault current on the system. In addition, by using a connecting rod transmission direct tripping mode, it is avoided that the contact is reclosed with the static contact after being repelled, thereby preventing the arc from reigniting, reducing the contact burning, and reducing the difficulty of arc extinguishing.

Description

Technical Field

[0001] The present invention relates to a circuit breaker, and more particularly to an improvement of a tripping mechanism of the circuit breaker. Background Art

[0002] Circuit breakers are a type of switch widely used in power distribution systems. When a circuit is overloaded, short-circuited, or under-voltage occurs, the circuit breaker needs to be able to quickly cut off the circuit to prevent components from burning out under excessive current. Therefore, circuit breakers usually have a quick tripping mechanism to quickly disconnect the circuit. The speed of the tripping directly affects the ability of the circuit breaker to cut off the fault current. Thermal magnetic releases are currently a commonly used tripping mechanism in the field of circuit breakers. However, when a short-circuit current occurs in the circuit, the yoke of the thermal magnetic release needs to be magnetized for a certain period of time to generate magnetic force, and then attract the armature to move. Finally, the lock mechanism is hit to release the switch to cut off the fault current. Not only does it require two-level mechanical transmission, but in conventional technology, the armature of the thermal magnetic release is far away from the yoke (the air gap between the armature and the yoke is large), resulting in a relatively small initial suction force of the yoke on the armature, and the armature is not moving quickly enough. In this way, the thermal magnetic release has a relatively slow response speed, resulting in a longer existence time of the fault current, affecting system safety. In addition, thermal magnetic releases usually have more parts and a more complex structure. Summary of the invention

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

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

[0005] The present invention proposes a circuit breaker, comprising a locking mechanism and a contact system, wherein the contact system comprises a rotatably connected moving contact, and the circuit breaker further comprises a connecting rod mechanism, wherein the moving contact comprises a moving contact located at one end of a rotation point and a mating surface at the other end, and the moving contact, the connecting rod mechanism and the locking mechanism constitute a tripping combination, and the locking mechanism has a triggering part, and when the moving contact is subjected to force and rotates, the connecting rod mechanism can be driven to move through the mating surface, and the movement of the connecting rod mechanism triggers the triggering part of the locking mechanism, so that the locking mechanism moves from a locking position to a tripping position.

[0006] Among them, in order to improve the tripping efficiency, in one embodiment, the locking mechanism includes at least a tripping half-shaft and a tripping piece that can overlap and cooperate with the tripping half-shaft, the tripping half-shaft is provided with the trigger part, and the connecting rod mechanism is arranged in a rotatable manner. When the moving contact rotates, the connecting rod mechanism is used to convert the movement trajectory of the mating surface into a driving force that can move the trigger part on the tripping half-shaft, thereby causing the tripping half-shaft to rotate and the locking mechanism to move to the tripping position.

[0007] In order to utilize the repulsive force of the moving contact to achieve quick release, based on the compactness and reliability of the structure, in one embodiment, the connecting rod mechanism includes a first connecting rod and a second connecting rod, the first connecting rod includes a first matching portion and a second matching portion, the second connecting rod has a third matching portion and a driving portion, the first connecting rod is arranged close to the matching surface with the first matching portion, the second matching portion of the first connecting rod is matched with the third matching portion of the second connecting rod, and the driving portion is matched with the triggering portion. When the moving contact rotates, the matching surface of the moving contact can be converted into a pushing force on the first connecting rod through the cooperation with the first matching portion, so that the first connecting rod rotates in the direction toward the second connecting rod. When the first connecting rod rotates toward the second connecting rod, it can be converted into a steering force on the second connecting rod through the cooperation of the second matching portion and the third matching portion, so that the driving portion has a driving force that can move the triggering portion.

[0008] To avoid mutual interference during the dynamic movement of the circuit breaker, in one embodiment, the first connecting rod and the moving contact are both rotatably connected and arranged on the same movable component (ie, the rotating disk in the embodiment).

[0009] Among them, in order to improve the stability of the force received and applied by the first connecting rod, in one embodiment, the first connecting rod is a block structure roughly in the shape of a "d", including a second protrusion forming a "d"-shaped body, a first protrusion protruding toward the mating surface, and an end away from the two, and the end is rotatably pivoted, and the first protrusion serves as the first mating portion, and the second protrusion serves as the second mating portion.

[0010] Among them, in order to improve the mechanical properties, increase the life of parts, and improve the stability of force-bearing movement, in one embodiment, the second connecting rod is a block structure that is roughly "C"-shaped, including a base portion that is rotatably pivoted, a first protrusion extending outward from the base portion as a third matching portion, and a driving portion extending outward from the base portion, the first protrusion is in abutment with the second matching portion of the first connecting rod, the driving portion is a hook-shaped structure, and the end of the driving portion serves as a force application point for the driving force to move the trigger portion.

[0011] Among them, in order to improve the tripping efficiency, the gas outlet of the arc extinguishing chamber is utilized. In one embodiment, an arc extinguishing system is also included, and the second connecting rod also has a second protrusion extending and protruding toward the outside of the base portion, and the second protrusion is a flat plate-like structure with a plane facing the direction of the arc extinguishing system.

[0012] Among them, based on installation and manufacturing considerations, in one embodiment, the tripping half-shaft has a roughly cylindrical base portion, and a first groove is opened on the outer circle of the base portion along its tangent direction, and one end of the first groove has a step structure connected with the groove, and the tripping half-shaft and the jumper piece can be rotatably arranged, and one end of the jumper piece can overlap the step structure, and when the tripping half-shaft rotates, one end of the jumper piece can be separated from the contact with the step structure and fall into the first groove, and the jumper piece is a sheet-like structure, one end of which has a hook-shaped overlapping portion, and the jumper piece overlaps the step structure with its overlapping portion.

[0013] Among them, based on installation and manufacturing considerations, in one embodiment, the release half-shaft also includes a shaft ring, which is sleeved on the base portion, and the shaft ring is provided with a second groove along its tangent on its outer circumference. When the shaft ring is sleeved on the base portion, the second groove and the outer cylindrical surface of the base portion form the stepped structure.

[0014] In order to make way for the jumper piece, in one embodiment, the trigger portion is a flat-plate paddle structure and has a gap that is roughly equivalent to the width of the first groove, and the gap and the first groove together form a space for the jumper piece to fall.

[0015] Among them, in order to achieve the resetting of the locking mechanism and limit the locking mechanism to a reasonable rotation position, in one embodiment, the locking mechanism also includes a limiting mechanism and a reset member, the limiting mechanism is used to limit the rotation angle range of the tripping half-shaft, and the reset member is used to apply a reset force to the tripping half-shaft to move from the unlocking position to the locking position.

[0016] Among them, based on manufacturing and installation considerations, in one embodiment, the circuit breaker has a circuit breaker housing, the circuit breaker housing has a fan-shaped groove, the tripping half-shaft has an extension portion that is not coaxial and extends along the axial direction of the tripping half-shaft and is roughly "L"-shaped, the tripping half-shaft is rotatably mounted on the circuit breaker housing, and when the tripping half-shaft is mounted on the circuit breaker housing, the first extension portion is inserted into the fan-shaped groove, thereby realizing the limiting mechanism.

[0017] Wherein, based on cost and installation considerations, in one embodiment, the reset member is a torsion spring, and one arm of the torsion spring rests on the extension portion.

[0018] Among them, in order to ensure the multiple tripping functions, in one embodiment, based on the improved design of the above structure, in addition to having space for a second tripping combination to form a second tripping mode, the circuit breaker also includes a thermal magnetic tripper, and the second tripping combination includes the thermal magnetic tripper and the locking mechanism. The locking mechanism also has a second triggering part, and the thermal magnetic tripper is used to generate a driving force for the second triggering part after being triggered by magnetic excitation and / or thermal deformation, thereby triggering the second triggering part of the locking mechanism, and causing the locking mechanism to move from the locking position to the tripping position.

[0019] The present invention has the following beneficial effects: the present invention utilizes the Holm force and Lorentz magnetic force generated by the short-circuit current to quickly repel the contacts, and directly releases the tripping half-shaft and the jumper piece through the tripping combination transmission, thereby shortening the mechanism response time, improving the ability to cut off the fault current, and reducing the impact of the fault current on the system. In addition, by directly tripping through the connecting rod transmission, the contacts are prevented from closing again with the static contacts after being repelled, thereby preventing the arc from reigniting, reducing contact burning, and reducing the difficulty of arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional diagram of a circuit breaker in the embodiment (angle one);

[0021] Figure 2 is a three-dimensional diagram of a circuit breaker in the embodiment (angle 2);

[0022] Figure 3 is a structural exploded view of the circuit breaker in the embodiment (angle one);

[0023] Figure 4 is a structural exploded view of the circuit breaker in the embodiment (angle 2);

[0024] Figure 5 is a schematic diagram of the internal structure of a circuit breaker in an embodiment;

[0025] Figure 6 is a schematic diagram of a circuit breaker housing in an embodiment;

[0026] Figure 7 Schematic diagram of the arrangement of the moving terminal, the static terminal and the contact system of the circuit breaker in the embodiment;

[0027] Figure 8 is a structural exploded view of the contact system in the embodiment;

[0028] Fig. 9 is a schematic diagram of the embodiment in which the moving contact and the moving terminal are connected through a flexible wire;

[0029] Fig.10 is a stereoscopic diagram of a circuit breaker moving terminal, a static terminal and a contact system in an embodiment;

[0030] Fig.11 is a three-dimensional diagram of a turntable in an embodiment;

[0031] Fig.12 is a schematic diagram of the assembly of the turntable and the base in the embodiment;

[0032] Fig.13 is a schematic diagram of the static terminal and the dynamic terminal being connected in the embodiment;

[0033] Fig.14 is a schematic diagram of the static terminal and the dynamic terminal being disconnected in the embodiment;

[0034] Fig.15 is a three-dimensional diagram of a jump button piece in an embodiment;

[0035] Fig.16 is a schematic diagram of the assembly of the trip half shaft and the second connecting rod with the circuit breaker housing in the embodiment;

[0036] Fig.17 is a stereoscopic diagram of a tripping half-shaft in an embodiment (one);

[0037] Fig.18 is a three-dimensional diagram of a tripping half-shaft in an embodiment (part 2);

[0038] Fig.19 is a perspective view of the second connecting rod in the embodiment;

[0039] Fig. 20 Schematic diagram of the working principle of the tripping combination in the embodiment (when the circuit is turned on);

[0040] Fig.21 Schematic diagram of the working principle of the tripping combination in the embodiment (when the moving contact is repelled);

[0041] Fig. 22 Schematic diagram of the working principle of the tripping assembly in the embodiment (when the tripping piece is released);

[0042] Fig.23 is a schematic diagram of the force of the passive contact of the first connecting rod pushed in the embodiment;

[0043] Fig.24 Schematic diagram of the working mechanism of the thermal magnetic release in the embodiment. DETAILED DESCRIPTION

[0044] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0045] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0046] See also Figure 1-Figure 5 As shown, as a preferred embodiment of the present invention, a circuit breaker is provided, comprising a housing, an operating mechanism 2 mounted on the housing, a contact system 3, a locking mechanism 4, a tripper 5 and an arc extinguishing system 6. Figure 5 In the illustrated picture, the contact system 3 is approximately in the middle position, the tripper 5 and the operating mechanism 2 are arranged on the upper left and upper right sides of the contact system 3, and the arc extinguishing system 6 is arranged below the contact system 3.

[0047] See also Figure 1 , Figure 2 and Figure 6 The circuit breaker housing includes a base 1 and a substrate 8. The base 1 includes a first base 1' and a second base 1", which are connected with each other. The base 1 is formed by connecting the first base 1' and the second base 1", which can accommodate a contact system 3, a release 5 and an arc extinguishing system 6. The free gas generated by the internal arc is prevented from escaping and affecting personal safety. The substrate 8 includes a first substrate 8' and a second substrate 8", which are arranged opposite to each other. The first substrate 8' and the second substrate 8", are respectively fixed on the first base 1' and the second base 1", and an installation space for installing the operating mechanism 2 and the locking mechanism 4 is formed between the first substrate 8' and the second substrate 8". The base 1 and the substrate 8 constitute the installation base for the operating mechanism 2, the contact system 3, the locking mechanism 4, the release 5 and the arc extinguishing system 6 in this embodiment.

[0048] See also Figure 7 The circuit breaker has a static terminal 10 and a moving terminal 11 on both sides as electrical connection terminals. The static terminal 10 and the moving terminal 11 are controlled by a contact system 3 to control the conduction and disconnection between the two terminals. The contact system 3 is disconnected by rotating. Specifically, refer to Figure 8 and Fig.10 The contact system 3 includes a moving contact 31 that is roughly in the shape of a letter "J", and a hollow circular rotating disk 32. The rotating disk 32 is rotatably connected to the base 1, and the moving contact 31 is rotatably connected to the rotating disk 32. Specifically, refer to Fig.11 and Fig.12In this embodiment, the turntable 32 has a circular boss 321 at its center, and the circular boss 321 can be connected to the circular mounting hole 1'1 on the first base 1' (the size of the mounting hole 1'1 matches the size of the boss 321, and the clearance fit), so as to achieve a rotatable connection between the turntable 32 and the first base 1'. It is easy to associate that the turntable 32 can be provided with two circular bosses 321 that are respectively connected to the first base 1' and the second base 1" on both sides of the turntable 32 to increase the stability of the connection and movement of the turntable 32. In addition, refer to Figure 8 , Fig. 9 and Fig.11 The moving terminal 11 is electrically connected (welded) to the moving contact 31 through a soft wire 12. The moving contact 31 has a through hole 311. The moving contact 31 is connected to the mounting hole 322 on the turntable 32 through a pin, so that the moving contact 31 can be rotatably connected to the turntable 32.

[0049] See also Fig.13 and Fig.14 , showing that the static terminal 10 and the dynamic terminal 11 are conducting ( Fig.13 In the figure, one possible current flow direction is indicated for ease of understanding) and disconnection ( Fig.14 ), the static terminal 10 has a static contact, the static contact includes a static contact point 101, the dynamic contact 31 has a dynamic contact point 312, the rotary disk 32 can be driven by the operating mechanism 2 or driven to rotate under the unlocking movement of the locking mechanism 4, thereby driving the dynamic contact 31 to be relatively close to or away from the static terminal 10, when the dynamic contact 31 is close to the static terminal 10, the dynamic contact point 312 is against the static contact point 101, then the static terminal 10 and the dynamic terminal 11 are connected, when the dynamic contact 31 is away from the static terminal 10, then the static terminal 10 and the dynamic terminal 11 are disconnected, Fig.13 and Fig.14 The state of the middle contact system 3, that is, the state of the lower contact system 3 when the circuit breaker is in the closed state and the open state.

[0050] For the convenience of description, the following definitions are made for the location and orientation:

[0051] definition Figure 7 In the illustrated picture, the position of the moving terminal 11 relative to the static terminal 10 is on the left, and the position of the static terminal 10 relative to the moving terminal 11 is on the right;

[0052] definition Figure 6 In the illustrated picture, the first base 1' is located in the front relative to the second base 1", and the second base 1" is located in the rear relative to the first base 1';

[0053] definition Figure 7In the illustrated picture, the moving terminal 11 and the static terminal 10 are relatively located above the arc extinguishing system 6 , and the arc extinguishing system 6 is relatively located below the moving terminal 11 and the static terminal 10 .

[0054] When a circuit is seriously overloaded or has a short circuit or undervoltage fault, the circuit breaker needs to be able to quickly cut off the circuit to avoid burning of components under excessive current. Therefore, circuit breakers usually have a fast tripping mechanism to quickly disconnect the circuit. The speed of tripping directly affects the ability of the circuit breaker to cut off the fault current. In this regard, when the circuit breaker in this embodiment performs electrical protection, it has two tripping modes, namely, thermal magnetic tripping and repulsion tripping, according to the size of the overcurrent. The thermal magnetic tripping mode is implemented by the tripper 5 and the locking mechanism 4. When a smaller ampere current (such as 2.5kA in a specific typical application of this embodiment) flows over, the thermal magnetic tripping mode works. When a larger ampere current (such as 10kA in a specific typical application of this embodiment) flows over, the repulsion tripping mode mainly works. The repulsion tripping has a faster tripping speed and a stronger breaking capacity. The repulsive tripping mode is mainly realized by a tripping combination consisting of a moving contact 31, a locking mechanism 4 and a tripping connecting rod mechanism. The locking mechanism 4 includes a tripping half shaft 41 and a tripping piece 25 that can be overlapped on the tripping half shaft 41. The tripping half shaft 41 and the tripping piece 25 can be rotatably connected to the circuit breaker housing. Fig.15 The tripping plate 25 is a structure formed by joining two mirror-symmetrical unit plates 250 in a roughly "Y" shape, including two spaced parallel connecting parts 251, a converging part 252 extending from one end of the connecting part 251 and gradually approaching each other, and a lap part 253 connected to the end of the converging part 252. The connecting part 251 has a through hole 255 for rotationally connecting to the circuit breaker housing. The lap part 253 is curved and is used to overlap the tripping half shaft 41 to achieve rapid tripping of the operating mechanism 2. See also Figure 17-18The release half shaft 41 includes a substantially cylindrical base part 413, with a first convex column 417 and a second convex column 414 at the front and rear ends of the base part 413, which are used to rotatably match with the base plate 8, and a fan-shaped plate 415 extending substantially radially outward on the base part 413, and a third convex column 4152 extending axially backward on the base part 413 at its free end, and the fan-shaped plate 415 and the third convex column 4152 form an extension part of a substantially "L"-shaped structure that is not coaxial with the base part 413 and extends axially along the release half shaft 41. The fan-shaped plate 415 also has a raised stopper 4151. A collar 416 is sleeved and fixed on the base 413, and the collar 416 and the base 413 have a groove roughly opened along the tangent direction of the base 413 at the same position on the side. The opening depth of the groove on the collar 416 at least at one end near the upper end is greater than the opening depth of the groove on the base 413 at least at one end near the upper end, so that when the collar 416 is sleeved on the base 413, the collar 416 and the base 413 form a step 411 and a groove 412 connected together at the groove, and the groove 412 is a through groove that runs roughly from top to bottom. The overlapping portion 253 of the jump latch piece 25 can be overlapped on the step 411. When the release half shaft 41 rotates counterclockwise, the overlapping portion 253 of the jump latch piece 25 can be separated from the overlapping of the step 411 and fall from the groove 412. The collar 416 has a first paddle 4161 and a second paddle 4162 extending outwardly along the radial direction thereof. The free end of the second paddle 4162 is a "J"-shaped hook. Since the groove 412 needs to be provided, the second paddle 4162 has a gap corresponding to the groove 412 at a position corresponding to the groove 412, and the gap and the groove 412 form a space for the overlapping portion 253 of the tripping plate 25 to fall. In the front-to-back direction, the fan-shaped plate 415, the first paddle 4161 and the second paddle 4162 are separated in a "Y" shape. In this embodiment, a collar 416 is sleeved on the base 413 to form the step 411 and the groove 412 on the tripping half shaft 41, which is more convenient for production and installation. In other embodiments, the tripping half shaft 41 can also be integrally formed.

[0055] See also Fig.16The tripping half shaft 41 is rotatably connected to the through hole 8"2 on the second base plate 8" by its second protrusion 414, and the third protrusion 4152 of the tripping half shaft 41 will fall into the fan annular groove 8"3 on the second base plate 8" at the same time. The fan annular groove 8"3 limits the rotation range of the tripping half shaft 41, which prevents the tripping half shaft 41 from generating position deviation under the action of the torsion spring 14, and limits the rotation angle of the tripping half shaft 41, so as to cooperate with the design of the step 411 and the groove 412 and the overlap. The assembly position of the part 253. A torsion spring 14 is arranged on the left side of the fan annular groove 8"3. The torsion spring 14 is wound on the fixing seat 8"4 protruding on the second base plate 8". The first arm 141 of the torsion spring 14 is blocked by the stopper 8"5 to limit the torsion. When the release half shaft 41 is assembled on the second base plate 8", the second arm 142 of the torsion spring 14 abuts against the third protrusion 4152 of the fan-shaped plate 415 of the release half shaft 41. The torsion spring 14 is axially contacted by the limit table 4151 and the second base plate 8" in the front-rear direction. 4 is used for limiting. The fan-shaped plate 415 is always given a reset force roughly toward the right side, so that the tripping half-shaft 41 always has a tendency to rotate clockwise. On the one hand, when the tripping plate 25 overlaps the step 411 (that is, in the locked state), the step 411 on the tripping half-shaft 41 can be made to contact the tripping plate 25 to the right to form a stable lock. On the other hand, when the tripping plate 25 is manually opened and reset after being tripped, when the rising height of the tripping plate 25 is higher than the step 411, the tripping half-shaft 41 is pushed to rotate clockwise so that the step 411 overlaps the tripping plate 25 again, thereby helping the tripping half-shaft 41 to reset. In this embodiment, a fan-shaped annular groove is formed on the circuit breaker housing to cooperate with the tripping half-shaft to form a limiting mechanism, which is convenient for manufacturing and production, and improves the compactness of the structure; in this embodiment, the torsion spring 14 is used as the reset member of the tripping half-shaft, which is convenient for installation and relatively low in cost. In other embodiments, structures such as column springs can also be used as long as the above-mentioned structural functions can be met.

[0056] See also Fig.19The tripping link mechanism includes a second link 42 that is roughly "C"-shaped. The second link 42 includes a cylindrical base portion 421, which is used to be rotatably connected to the circuit breaker housing. A protrusion 423 (serving as a mating portion for the second link 42 to abut against the first link 33) and a flat plate 424 are connected to the outer peripheral side of the base portion 421, and a roughly hook-shaped push-butt portion 422 (serving as a driving portion for the second link 42 to abut against the tripping half-shaft 41) is connected to the outer peripheral side of the base portion 421. When the second link 42 rotates, the push-butt portion 422 can abut against the second paddle 4162, thereby transmitting force to the tripping half-shaft 41 to rotate the tripping half-shaft 41. Therefore, a makeshift groove is provided at the place where the push-butt portion 422 and the second paddle 4162 are cut off to make way for the falling of the tripping piece 25. Furthermore, the push portion 422 is a hook-shaped structure, and the end of the push portion 422 extending approximately laterally serves as a force application point for the driving force of the second paddle 4162, so as to improve the mechanical properties of the push portion 422 as a force application structure. The second paddle 4162 is also hook-shaped, and the end of the push portion 422 can abut against the inner side of the hook structure of the second paddle 4162, so that the push-and-pull fit between the two is tighter. Fig.16 The second connecting rod 42 is rotatably connected to the second base 1", and in the closed state, the push portion 422 abuts against the second paddle 4162, so that the movement process between the two is shortened and the linkage efficiency is improved.

[0057] The tripping linkage mechanism also includes a first link 33, see again Figure 8 The first connecting rod 33 is rotatably connected to the inside of the rotating disk 32 by a pin connection. The first connecting rod 33 is a substantially "d"-shaped structure having a protruding block protruding toward the radial outer side of the rotating disk 32. Figure 20-21The lower end of the first connecting rod 33 rotatably connected to the turntable 32 (serving as the first matching portion for the first connecting rod 33 to abut against the moving contact 31) and the upper end of the moving contact 31 are arranged close to each other and have certain sliding matching surfaces respectively. The sliding matching surfaces of the two are designed to meet the following force requirements: when the moving contact 31 rotates clockwise, the sliding matching surface at the upper end of the moving contact 31 can exert a force on the sliding matching surface at the lower end of the first connecting rod 33 to make the first connecting rod 33 also rotate clockwise, thereby making the radial outer side of the first connecting rod 33 (serving as the second matching portion for the first connecting rod 33 to abut against the second connecting rod 42) protrude toward the outer periphery of the turntable 32. The lower end of the first connecting rod 33 is generally a convex structure with a smooth arc surface. On the one hand, the convex structure can reduce the area of ​​the first connecting rod 33 that is subjected to force and concentrate the force. On the other hand, the smooth arc surface design can make the moving contact 31 more stable in applying force to the first connecting rod 33. The upper end of the moving contact 31 is an involute arc surface that is generally outward from the contact point C, so that the upper end of the moving contact 31 can apply force to the first connecting rod 33 more stably, and the involute arc surface design can expand the surface of the moving contact 31 that can move and apply force, and increase the reliability of the linkage between the moving contact 31 and the first connecting rod 33. Thus, when the moving contact 31 rotates clockwise around the contact point C with the rotating disk 32, the upper end of the moving contact 31 contacts the lower end of the first connecting rod 33, and causes the first connecting rod 33 to rotate clockwise around the contact point D with the rotating disk 32, thereby exposing the rotating disk 32. Its force diagram is shown as follows. Fig.23 As shown, it can be seen that the force F4 of the moving contact 31 on the first connecting rod 33 is on the left side of the rotation center of the first connecting rod 33, thereby generating a torque to rotate the first connecting rod 33 clockwise, and the rotation center D of the first connecting rod 33 is set at the end away from the moving contact 31 to increase the force arm of the rotation force when the first connecting rod 33 is pushed by the moving contact. The first connecting rod 33 and the moving contact 31 can both be rotatably connected to the turntable 32, and mutual interference can be avoided under the dynamic movement of the circuit breaker. It should be noted that the design of the sliding mating surface of the lower end of the first connecting rod 33 and the upper end of the moving contact 31 is related to the movement position and appearance of the two. In different implementation applications, corresponding designs are required to meet the above-mentioned force requirements.

[0058] Please refer to the order Figure 20-22In combination with the above structural features, the repulsion tripping principle in this embodiment is as follows: when the circuit has an expected short-circuit current, the moving contact 31 is repelled under the action of the Holm force and the Lorentz magnetic force, and the upper end of the moving contact 31 pushes the first connecting rod 33 to rotate clockwise, so that the first connecting rod 33 is exposed to the rotating disk 32. During the rotation of the first connecting rod 33, the outer side of the protrusion thereof contacts the protrusion 423 of the second connecting rod 42, thereby pushing the second connecting rod 42 to rotate clockwise. At the same time, since the moving contact 31 is repelled and disengaged from the static contact, the moving contact 31 An arc is generated between the static contact and the internal pressure of the arc extinguishing chamber increases, and the high-pressure gas generated by the arc extinguishing system 6 below moves upward to push the plate 424 (therefore, preferably, the plate 424 is a flat plate-like structure with a plane facing the direction of the arc extinguishing system 6), thereby pushing the second connecting rod 42 to rotate clockwise. During the clockwise rotation of the second connecting rod 42, the pushing portion 422 thereof abuts against the second paddle 4162, thereby finally pushing the tripping half-shaft 41 to rotate counterclockwise, so that the tripping half-shaft is disengaged from the tripping catch, thereby causing the switch to trip and cut off the fault circuit.

[0059] Next, when the tripping piece 25 is released and the switch is manually opened and reset, it can be seen from the above-mentioned torsion spring 14 that the torsion spring 14 will drive the tripping half-shaft 41 to rotate clockwise and reset. During this process, the second paddle 4162 will contact the push-button portion 422 to push the second connecting rod 42 to rotate counterclockwise and reset. The first connecting rod 33 is provided with a torsion spring structure at its rotation point to reset the first connecting rod 33. Similarly, the second connecting rod 42 can also be provided with a reset torsion spring, but under the action mechanism of the second paddle 4162, it is not necessary to provide a reset torsion spring for the second connecting rod 42.

[0060] In this embodiment, a more compact and efficient two-link mechanism consisting of a first link 33 and a second link 42 is used to convert the motion trajectory of the sliding mating surface at the upper end of the moving contact 31 into a driving force that can move the second paddle 4162 on the tripping half-shaft 41, thereby rotating the tripping half-shaft 41 and realizing the movement of the locking mechanism to the unlocking position as an example for demonstration; however, in the application of other embodiments, other link mechanisms can also be redesigned according to specific needs, as long as they can meet the requirement of "converting the motion trajectory of the sliding mating surface of the moving contact into a driving force that can move the tripping half-shaft", they are all feasible technical solutions.

[0061] In addition, it is worth mentioning that in this embodiment, a simple and effective operating mechanism 2 is arranged on the right side of the turntable 32 to drive the turntable 32 to rotate, and a first connecting rod 33 and a second connecting rod 42 (as a connecting rod mechanism) are arranged in the left space of the turntable 32 to trigger the locking mechanism 4 on the upper left side of the turntable 32 downward to realize repulsive release. The arrangement makes full use of the overall space of the circuit breaker, helps to reduce the external dimensions of the circuit breaker, and the reliability of the linkage between the mechanisms is also guaranteed.

[0062] The repulsive tripping method in this embodiment utilizes the Holm force and Lorentz magnetic force generated by the short-circuit current to quickly repel the contacts, and the tripping half-shaft 41 and the jumper 25 are directly released through the connecting rod transmission (with the help of the movement coordination of the first connecting rod 33, the second connecting rod 42 and the second paddle 4162), thereby shortening the response time of the mechanism, improving the ability to cut off the fault current, and reducing the impact of the fault current on the system. In addition, through the direct tripping method of the connecting rod transmission, the contacts are prevented from closing with the static contacts again after being repelled, thereby preventing the arc from reigniting, reducing contact burning, and reducing the difficulty of arc extinguishing.

[0063] As mentioned above, this embodiment also has a thermal magnetic tripping method, which is implemented by the tripper 5 and the locking mechanism 4, see Fig.24 The release 5 is a thermal magnetic release. When a short circuit occurs in the circuit, the yoke on the release 5 is magnetized, and the armature 51 is attracted to act, so that the armature 51 hits the first paddle 4161, thereby causing the release half shaft 41 to rotate counterclockwise, and the tripping piece 25 trips the switch and cuts off the fault circuit.

[0064] In addition, the first paddle 4161 and the second paddle 4162 on the tripping half shaft 41 in this embodiment are used as the triggering part for the rotation of the tripping half shaft 41. After the triggering part is triggered (such as the hitting of the tripping device 5 and the pushing effect of the second connecting rod 42), the tripping half shaft 41 is rotated to achieve the purpose of tripping. In other application occasions, the triggering part can be adaptively designed according to the actual situation to serve as the receiving part of the driving force finally formed in the repulsive tripping mode or the thermal magnetic tripping mode, and after receiving the trigger, it is actuated to make the locking mechanism complete the unlocking. It can be a toggle rotation as in this embodiment, or other modes such as moving unlocking. Its movement design is based on the repulsive tripping mode provided in this embodiment, and combined with the tripping mechanism of various existing locking mechanisms. Similar "repulsive trigger tripping" solutions should be considered to be not separated from the technical ideas provided by the present invention.

[0065] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes in form and details made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims will fall within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising a locking mechanism and a contact system, wherein the contact system comprises a rotatably connected moving contact, characterized in that: The circuit breaker further comprises a connecting rod mechanism, the moving contact comprises a moving contact at one end of the rotation point and a matching surface at the other end, the moving contact, the connecting rod mechanism and the locking mechanism constitute a tripping assembly, wherein: the locking mechanism has a triggering portion, when the moving contact is subjected to force and rotates, the connecting rod mechanism can be driven to move through the matching surface, the movement of the connecting rod mechanism triggers the triggering portion of the locking mechanism, and the locking mechanism moves from the locking position to the unlatching position; the connecting rod mechanism comprises a first connecting rod and a second connecting rod, the first connecting rod comprises a first matching portion and a second matching portion, the second connecting rod has a third matching portion and a driving portion, the first The connecting rod is arranged with the first matching portion and the matching surface close to each other, the second matching portion of the first connecting rod matches with the third matching portion of the second connecting rod, and the driving portion matches with the triggering portion. When the moving contact rotates, the matching surface of the moving contact can be converted into a pushing force on the first connecting rod by matching with the first matching portion, so that the first connecting rod rotates in the direction toward the second connecting rod. When the first connecting rod rotates toward the second connecting rod, it can be converted into a steering force on the second connecting rod by matching with the second matching portion and the third matching portion, so that the driving portion has a driving force that can move the triggering portion.

2. The circuit breaker according to claim 1, characterized in that: The locking mechanism at least includes a tripping half-shaft and a tripping piece that can overlap and cooperate with the tripping half-shaft. The tripping half-shaft is provided with the trigger part. The connecting rod mechanism is rotatably arranged. When the moving contact rotates, the connecting rod mechanism is used to convert the movement trajectory of the matching surface into a driving force that can move the trigger part on the tripping half-shaft, so that the tripping half-shaft rotates, and the locking mechanism moves to the unlatching position. The tripping half-shaft and the tripping piece can both be rotatably arranged.

3. The circuit breaker according to claim 1, characterized in that: The first connecting rod and the moving contact are both rotatably connected and arranged on the same movable component.

4. The circuit breaker according to claim 1, characterized in that: The first connecting rod is a block structure roughly in the shape of a "d", including a second protrusion forming a "d"-shaped body, a first protrusion protruding toward the mating surface, and an end away from the two, and the end is rotatably pivoted, the first protrusion serves as the first mating portion, and the second protrusion serves as the second mating portion.

5. The circuit breaker according to claim 1, characterized in that: The second connecting rod is a block structure that is roughly "C" shaped, including a base portion that is rotatably pivoted, a first protruding portion that extends outward from the base portion as a third matching portion, and a driving portion that extends outward from the base portion, the first protruding portion is in abutment with the second matching portion of the first connecting rod, the driving portion is a hook-shaped structure, and the end of the driving portion serves as a force application point for the driving force to move the trigger portion.

6. The circuit breaker according to claim 5, characterized in that: It also includes an arc extinguishing system, and the second connecting rod also has a second protruding portion extending and protruding toward the outside of the base portion, and the second protruding portion is a flat plate-shaped structure with a plane facing the arc extinguishing system.

7. The circuit breaker according to claim 2, characterized in that: The tripping half-shaft has a roughly columnar base portion, and a first groove is opened on the outer circle of the base portion along its tangent direction. One end of the first groove has a step structure connected with the groove, and one end of the tripping piece can overlap the step structure, and when the tripping half-shaft rotates, one end of the tripping piece can break away from the contact with the step structure and fall into the first groove. The tripping piece is a sheet-like structure, and one end of it has a hook-shaped overlapping portion, and the tripping piece overlaps the step structure with its overlapping portion.

8. The circuit breaker according to claim 7, characterized in that: The release half shaft also includes a shaft ring, which is sleeved on the base part. The shaft ring has a second groove on its outer circumference along its tangent direction. When the shaft ring is sleeved on the base part, the second groove and the outer circumferential surface of the base part form the stepped structure.

9. The circuit breaker according to claim 7, characterized in that: The trigger portion is a flat plate-shaped paddle structure and has a gap having a width substantially equal to that of the first groove, and the gap and the first groove together form a clearance space for the jumper piece to fall.

10. The circuit breaker according to claim 2, characterized in that: The locking mechanism further comprises a limiting mechanism and a reset member, wherein the limiting mechanism is used to limit the rotation angle range of the tripping half-shaft, and the reset member is used to apply a reset force to the tripping half-shaft to move from the unlocking position to the locking position.

11. The circuit breaker according to claim 10, characterized in that: The circuit breaker comprises a circuit breaker housing, the circuit breaker housing is provided with a fan-shaped annular groove, the tripping half-shaft is provided with an extension portion which is not coaxial and extends along the axial direction of the tripping half-shaft and is generally in an "L"-shaped structure, the tripping half-shaft is rotatably mounted on the circuit breaker housing, and when the tripping half-shaft is mounted on the circuit breaker housing, the extension portion is inserted into the fan-shaped annular groove, thereby realizing the limiting mechanism.

Images