CN116266520A - Tripping mechanism and circuit breaker - Google Patents

Abstract

A tripping mechanism and a circuit breaker relate to the technical field of electrical switches. The tripping mechanism comprises a bracket, a locking piece and a tripping piece, wherein the bracket, the locking piece and the tripping piece are respectively arranged in a shell of the circuit breaker, the bracket is respectively in rotary connection with the shell, the locking piece, the tripping piece and a moving contact of the circuit breaker, the locking piece is used for being buckled with the tripping piece, the tripping piece is in transmission connection with a handle of the circuit breaker, and the handle is driven to drive the moving contact to be switched on or switched off with a fixed contact of the circuit breaker through the joint cooperation of the bracket, the locking piece and the tripping piece; wherein, jump fastener and moving contact coaxial rotation connect on the support. The circuit breaker comprises a shell, a handle, a moving contact, a fixed contact, an input terminal, an output terminal and the tripping mechanism, wherein the handle, the moving contact, the fixed contact, the input terminal, the output terminal and the tripping mechanism are arranged in the shell, and the handle is driven to drive the moving contact and the fixed contact to close or open through the tripping mechanism. The tripping mechanism and the circuit breaker can solve the problem of larger size of the traditional circuit breaker.

Description

Tripping mechanism and circuit breaker

Technical Field

The invention relates to the technical field of electrical switches, in particular to a tripping mechanism and a circuit breaker.

Background

With the rapid development of social economy and urban construction, the living standard and living level of people are remarkably improved, and the electricity safety is more comprehensively perceived. To increase the safety of electricity, circuit breakers are typically connected in the electricity loop. A circuit breaker refers to a switching device capable of closing, carrying and opening a current under normal circuit conditions and closing, carrying and opening a current under abnormal circuit conditions within a prescribed time. When faults such as electric leakage, overload and short circuit occur in the system, the circuit breaker can rapidly cut off a fault circuit in the system or cut off the power supply of the whole power supply so as to prevent the faults from expanding and avoid huge economic loss and casualties.

The distribution box is the last-stage distribution facility in the power supply system and is used for realizing distribution and protection of electric energy, and is embedded in a wall body, so that the volume is small. Traditional circuit breaker wholly is protruding font, and its binding post adopts the screw wiring generally, and circuit breaker itself is high great, and receives wiring direction restriction, and the height that needs when the wiring is installed is also very big. The circuit breaker adopting the screw connection can occupy the operation space of the operation handle of the circuit breaker. In order to ensure that the operating handle has sufficient moving space, the overall volume of the circuit breaker tends to increase. The smaller-sized distribution boxes (for example, 86-bottom box, 118-bottom box, 120-bottom box, etc. are set as distribution boxes) have high demands for miniaturization of the circuit breaker provided therein, which may be difficult to satisfy due to defects of the height thereof, and thus, more miniaturized circuit breakers are required to meet market demands.

Disclosure of Invention

The invention aims to provide a tripping mechanism and a circuit breaker, which can solve the problem of larger size of the traditional circuit breaker.

Embodiments of the present invention are implemented as follows:

in one aspect of the embodiment of the invention, a tripping mechanism is provided, which comprises a bracket, a locking piece and a tripping piece, wherein the bracket, the locking piece and the tripping piece are respectively arranged in a shell of a circuit breaker, the bracket is respectively in rotary connection with the shell, the locking piece, the tripping piece and a moving contact of the circuit breaker, the locking piece is used for being buckled with the tripping piece, the tripping piece is in transmission connection with a handle of the circuit breaker, and the handle is driven to drive the moving contact to be switched on or switched off with a fixed contact of the circuit breaker through the cooperation of the bracket, the locking piece and the tripping piece; the jump fastener and the moving contact are coaxially and rotatably connected to the bracket. The tripping mechanism can solve the problem of larger size of the traditional circuit breaker.

Optionally, a first rotating shaft and a second rotating shaft are respectively arranged on the support, a yielding hole is formed in the moving contact corresponding to the first rotating shaft, the moving contact is rotationally connected with the support through the second rotating shaft, the support is rotationally connected with the shell through the first rotating shaft, the locking piece is rotationally connected with the support through the first rotating shaft, the locking piece is located between the moving contact and the shell, the locking piece is rotationally connected with the support through the second rotating shaft, and the locking piece is located between the moving contact and the shell.

Optionally, an arc-shaped partition plate is arranged on the support, two ends of the arc-shaped partition plate respectively correspond to the positions of the moving contact and the fixed contact when the circuit breaker is in the opening state, and the arc-shaped partition plate is used for limiting gas generated by an arc extinguishing mechanism of the circuit breaker to pass through.

Optionally, the trip mechanism further includes a first elastic member sleeved on the first rotating shaft, one end of the first elastic member abuts against the locking member, the other end abuts against the bracket, and the first elastic member is used for providing a restoring force for the movement of the locking member relative to the bracket; the tripping mechanism further comprises a second elastic piece sleeved on the first rotating shaft, one end of the second elastic piece is propped against the moving contact, the other end of the second elastic piece is propped against the shell, and the second elastic piece is used for providing reset force for the moving contact relative to the motion of the shell.

Optionally, the support is further provided with a through hole, the through hole is located between the first rotating shaft and the second rotating shaft, and one end of the second elastic element passes through the through hole and abuts against the moving contact, so that the moving contact abuts against the support.

Optionally, the tripping mechanism further comprises a transmission piece rotatably arranged in the shell, the handle is in transmission connection with the tripping piece through the transmission piece, the transmission piece is connected with the tripping piece through a first connecting rod, and the handle is connected with the transmission piece through a gear or a second connecting rod; the transmission piece is provided with an installation shaft, the transmission piece is connected with the shell in a rotating way through the installation shaft, the tripping mechanism further comprises a third elastic piece sleeved on the installation shaft, one end of the third elastic piece is propped against the transmission piece, the other end of the third elastic piece is propped against the shell, and the third elastic piece is used for providing reset force for the motion of the transmission piece relative to the shell.

In another aspect of the embodiment of the invention, a circuit breaker is provided, which comprises a shell, and a handle, a moving contact, a fixed contact, an input terminal, an output terminal and the tripping mechanism which are arranged in the shell, wherein the input terminal and the output terminal are respectively used for being spliced with a distribution box, and the handle is driven to drive the moving contact and the fixed contact to be switched on or off through the tripping mechanism; the circuit breaker comprises a shell, an input terminal, an output terminal, a handle and a circuit breaker, wherein the input terminal and the output terminal are arranged on the same side of the shell at intervals, the handle is arranged on one side of the shell opposite to the input terminal, and when the circuit breaker is in closing, one surface of the handle, which is away from the shell, is flush with one surface of the shell opposite to the input terminal. The tripping mechanism can solve the problem of larger size of the traditional circuit breaker.

Optionally, the circuit breaker further includes an electromagnetic release, a coil of the electromagnetic release is connected with one end of the moving contact, which is far away from the fixed contact, through a first flexible connecting wire, a first protrusion is arranged on a locking piece of the release mechanism, the electromagnetic release corresponds to the release mechanism in position, and when current is short-circuited, an ejector rod of the electromagnetic release pushes the first protrusion to drive the locking piece to be unlocked with the locking piece of the release mechanism, so that the moving contact and the fixed contact are separated.

Optionally, the circuit breaker still includes being located electromagnetic release keeps away from the hot trip ware of one side of handle, the stiff end of hot trip ware pass through the second flexible connection line with output terminal is connected, the expansion end of hot trip ware with the coil of electromagnetic release keeps away from the one end of moving contact is connected, still be provided with the second arch on the latch piece, the hot trip ware with trip mechanism position corresponds, when electric current overload the expansion end of hot trip ware promotes the second arch drives the latch piece with trip mechanism's jump fastener unbuckles, so that moving contact with the stationary contact brake.

Optionally, the circuit breaker still includes being located the heat trip is kept away from the arc extinguishing mechanism of one side of electromagnetic release, arc extinguishing mechanism includes first striking board and the second striking board of relative setting and is located first striking board with between the second striking board, the entry of explosion chamber with moving contact with the stationary contact is relative setting, the export orientation of explosion chamber be close to one side of output terminal and with output terminal electrical insulation.

The beneficial effects of the embodiment of the invention include:

the tripping mechanism comprises a bracket, a locking piece and a tripping piece, wherein the bracket, the locking piece and the tripping piece are respectively arranged in a shell of the circuit breaker, the bracket is respectively in rotary connection with the shell, the locking piece, the tripping piece and a moving contact of the circuit breaker, the locking piece is used for being buckled with the tripping piece, the tripping piece is in transmission connection with a handle of the circuit breaker, and the handle is driven to drive the moving contact to be switched on or switched off with a fixed contact of the circuit breaker through the joint cooperation of the bracket, the locking piece and the tripping piece; the trip piece and the moving contact are coaxially and rotatably connected to the support, so that the specific structure and the installation and matching of the trip mechanism are simpler, the occupied space of the trip mechanism is smaller, meanwhile, the transmission action is simpler, the miniaturization of the circuit breaker is facilitated, and the automatic production is facilitated.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a cross-sectional view of a circuit breaker in a manual closing state according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a circuit breaker according to an embodiment of the present invention in a manual opening state;

fig. 3 is a cross-sectional view of a circuit breaker in a fault breaking state according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a structure of a latch and a jump fastener in a locked state according to an embodiment of the present invention;

FIG. 5 is a second schematic view of a structure of a latch and a jump fastener in a locked state according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a latch and a jump fastener in a tripped state according to an embodiment of the invention;

fig. 7 is a schematic structural diagram of a bracket of a trip mechanism according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a moving contact of a circuit breaker according to an embodiment of the present invention;

fig. 9 is a second schematic structural diagram of a moving contact of the circuit breaker according to the embodiment of the present invention;

fig. 10 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention.

Icon: 100-tripping mechanism; 110-a bracket; 111-a first rotation axis; 112-a second spindle; 113-avoiding holes; 114-arc-shaped partition plates; 120-locking piece; 121-a first bump; 122-a second bump; 130-jump fastener; 140-a first elastic member; 150-a second elastic member; 160-a transmission member; 161-a first link; 162-gear; 170-a third elastic member; 200-a circuit breaker; 210-a housing; 211-an adjusting member; 220-handle; 230-a moving contact; 231-contacts; 232-weld; 233-mounting holes; 234-connecting holes; 235-relief holes; 236-limit protrusions; 240-stationary contact; 250-input terminals; 260-output terminals; 270-an electromagnetic release; 271-first flexible connection lines; 280-thermal trip; 281-second flexible connecting line; 290-arc extinguishing mechanism; 291-first striking plate; 292-a second striking plate; 293-arc extinguishing chamber.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be connected between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 10 in combination, an embodiment of the present application provides a circuit breaker 200, including a housing 210, and a handle 220, a moving contact 230, a fixed contact 240, an input terminal 250, an output terminal 260 and a tripping mechanism 100 disposed in the housing 210, where the input terminal 250 and the output terminal 260 are respectively used for plugging with a distribution box, and the handle 220 is driven to drive the moving contact 230 and the fixed contact 240 to close or open through the tripping mechanism 100; the input terminal 250 and the output terminal 260 are disposed at the same side of the housing 210 at intervals, the handle 220 is disposed on a side of the housing 210 opposite to the input terminal 250, and when the circuit breaker 200 is in closing, a surface of the handle 220 facing away from the housing 210 is flush with a surface of the housing 210 opposite to the input terminal 250. The trip mechanism 100 can solve the problem of the large size of the conventional circuit breaker 200.

As shown in fig. 1 to 3, the housing 210 may be two sub-housings 210 disposed opposite to each other, and the two sub-housings 210 together enclose a receiving space for receiving various components, so as to improve the simplicity of the circuit breaker 200 in the manufacturing process. To plug the circuit breaker 200 into the distribution box, the circuit breaker 200 further includes an input terminal 250 and an output terminal 260 disposed within the housing 210, and the input terminal 250 and the output terminal 260 may be plug terminals, for example, such that the input terminal 250 can be plugged into an input terminal row within the distribution box and the output terminal 260 can be plugged into an output terminal row within the distribution box, thereby connecting the circuit breaker 200 into a power circuit having a load.

In order to realize the breaking function of the circuit breaker 200, as shown in fig. 1 to 3, the circuit breaker 200 further includes a handle 220, a moving contact 230, a fixed contact 240 and a tripping mechanism 100, which are disposed in the housing 210, wherein the handle 220 is rotatably connected with the housing 210, so that the handle 220 can rotate relative to the housing 210, the handle 220 is in transmission connection with the moving contact 230 through the tripping mechanism 100, the fixed contact 240 is fixedly connected with the housing 210, the moving contact 230 is connected with an output terminal 260, and the fixed contact 240 is connected with an input terminal 250, so that when the handle 220 is driven by an external force, the handle 220 can move by driving the tripping mechanism 100, thereby driving the moving contact 230 to approach or separate towards the fixed contact 240, and thus the circuit breaker 200 realizes switching on or off. The handle 220 is in transmission connection with the moving contact 230 through the tripping mechanism 100, and may be always in transmission relation, or may be in transmission relation only when needed.

Specifically, as shown in fig. 1 and 2, when the moving contact 230 moves toward a side close to the fixed contact 240 to make the moving contact 230 contact the fixed contact 240, the circuit breaker 200 may be switched on, and at this time, a conductive loop formed by the input terminal row, the input terminal 250, the fixed contact 240, the moving contact 230, the output terminal 260, and the output terminal row together may be conducted; when the moving contact 230 moves toward a side far from the fixed contact 240 to disengage the moving contact 230 from the fixed contact 240, the circuit breaker 200 may be opened, and at this time, a conductive loop formed by the input terminal row, the input terminal 250, the fixed contact 240, the moving contact 230, the output terminal 260, and the output terminal row together may be opened, thereby switching on and off states of the load through the circuit breaker 200.

In addition, the input terminal 250 and the output terminal 260 are disposed at the same side of the housing 210 at intervals (as shown in fig. 1 to 3, the input terminal 250 and the output terminal 260 are disposed below the housing 210, respectively), so that the same side and same side functions can be realized. The description is simplified here with respect to the direction of conduction of the incoming load circuit (or, with respect to the side of the housing 210 provided with the input terminal 250 and the output terminal 260 as the rear end), that is, the form of connection of the incoming and outgoing circuit is formed, thereby improving the convenience of connection of the circuit breaker 200 when it is inserted into the distribution box. In addition, the input terminals 250 and the output terminals 260 are arranged in a spaced mode, so that the distance between the incoming line and the outgoing line can be increased, and interference between the incoming line and the outgoing line can be avoided.

Meanwhile, as shown in fig. 1 and 2, the handle 220 is disposed at a side of the housing 210 opposite to the input terminal 250, and a side of the handle 220 facing away from the housing 210 is flush with a side of the housing 210 opposite to the input terminal 250 when the circuit breaker 200 is in a manual closing state; when the circuit breaker 200 is in the manual off state, a side of the handle 220 facing away from the housing 210 and a side of the housing 210 opposite the input terminal 250 have an included angle. On the basis that the handle 220 can drive the moving contact 230 and the fixed contact 240 to close or open through the tripping mechanism 100, the smaller the angle of the included angle is, the smaller the operation space of the handle 220 is, so that the smaller the size of the circuit breaker 200 is. The included angle may be, for example, less than 30 °.

As shown in fig. 4 to 6, the trip mechanism 100 includes a bracket 110, a latch member 120 and a trip member 130, wherein the bracket 110, the latch member 120 and the trip member 130 are respectively disposed in a housing 210 of the circuit breaker 200, the bracket 110 is respectively rotatably connected with the housing 210, the latch member 120, the trip member 130 and a moving contact 230 of the circuit breaker 200, the latch member 120 is used for being buckled with the trip member 130, the trip member 130 is in transmission connection with a handle 220 of the circuit breaker 200, and the handle 220 is driven to drive the moving contact 230 to close or open with a fixed contact 240 of the circuit breaker 200 through the cooperation of the bracket 110, the latch member 120 and the trip member 130; the trip 130 and the moving contact 230 are coaxially and rotatably connected to the bracket 110, so that the specific structure and the installation and matching of the trip mechanism 100 are simpler, the occupied space of the trip mechanism 100 is smaller, and meanwhile, the transmission action is simpler, thereby being beneficial to realizing miniaturization of the circuit breaker 200 and realizing automatic production.

Specifically, as shown in fig. 4 to 7, a first rotating shaft 111 and a second rotating shaft 112 are respectively disposed on the support 110, a yielding hole 235 is disposed on the moving contact 230 corresponding to the first rotating shaft 111, the moving contact 230 is rotationally connected with the support 110 through the second rotating shaft 112, the support 110 is rotationally connected with the housing 210 through the first rotating shaft 111, the latch 120 is rotationally connected with the support 110 through the first rotating shaft 111, the latch 120 is located between the moving contact 230 and the housing 210, the latch 130 is rotationally connected with the support 110 through the second rotating shaft 112, and the latch 130 is located between the moving contact 230 and the housing 210.

The height of the first rotating shaft 111 needs to be greater than the sum of the thickness of the moving contact 230 and the thickness of the locking member 120, so that after the moving contact 230 is sleeved on the second rotating shaft 112, the locking member 120 can also be sleeved on the first rotating shaft 111, and meanwhile, a certain gap is formed between the locking member 120 and the adjacent housing 210, so that the housing 210 can avoid interference between the locking member 120 and the relative movement of the locking member 130 and the bracket 110. Similarly, the height of the second rotating shaft 112 needs to be greater than the sum of the thickness of the moving contact 230 and the thickness of the snap fastener 130, so that after the moving contact 230 is sleeved on the second rotating shaft 112, the snap fastener 130 can be sleeved on the second rotating shaft 112, and meanwhile, a certain gap is formed between the snap fastener 130 and the adjacent shell 210, so that the shell 210 can avoid interference between the snap fastener 130 and the relative movement of the snap fastener 120 and the bracket 110.

In order to enable the latch member 120 to recover its original state during the closing and opening processes of the moving contact 230 and the fixed contact 240, as shown in fig. 4 to 6, in this embodiment, the trip mechanism 100 further includes a first elastic member 140 sleeved on the first rotating shaft 111, one end of the first elastic member 140 abuts against the latch member 120, the other end abuts against the bracket 110, and the first elastic member 140 is used for providing a restoring force for the movement of the latch member 120 relative to the bracket 110.

In order to enable the moving contact 230 to recover its original state during the closing and opening processes of the moving contact 230 and the fixed contact 240, in this embodiment, as shown in fig. 4 to 6, the trip mechanism 100 further includes a second elastic member 150 sleeved on the first rotating shaft 111, where one end of the second elastic member 150 abuts against the moving contact 230, and the other end abuts against the housing 210, and the second elastic member 150 is used to provide a restoring force for the movement of the moving contact 230 relative to the housing 210.

In this embodiment, as shown in fig. 4 to 7, the bracket 110 is further provided with a avoidance hole 113, the avoidance hole 113 is located between the first rotating shaft 111 and the second rotating shaft 112, and one end of the second elastic member 150 passes through the avoidance hole 113 to abut against the moving contact 230, so that the moving contact 230 abuts against the bracket 110. In this way, the second elastic member 150 can make the end of the moving contact 230 away from the fixed contact 240 (or the end of the moving contact 230 near the first rotating shaft 111 of the bracket 110) and the bracket 110 abut against each other, so as to provide the contact pressure during closing and the restoring force during opening for the moving contact 230 through the second elastic member 150.

Alternatively, as shown in fig. 1 to 3, the trip mechanism 100 further includes a transmission member 160 rotatably disposed in the housing 210, the handle 220 is in transmission connection with the trip member 130 through the transmission member 160, the transmission member 160 is connected with the trip member 130 through a first link 161, and the handle 220 is connected with the transmission member 160 through a gear 162 or a second link. Illustratively, in this embodiment, the handle 220 is provided with a toothed portion, and the transmission member 160 is correspondingly provided with a gear 162, and the toothed portion is engaged with the gear 162, so that the handle 220 is in driving connection with the transmission member 160. The transmission of the gear 162 can save more space than the transmission of the link.

In order to enable the transmission member 160 to recover its own initial state during the closing and opening processes of the moving contact 230 and the fixed contact 240, in this embodiment, as shown in fig. 1 to 3, a mounting shaft is disposed on the transmission member 160, the transmission member 160 is rotatably connected with the housing 210 through the mounting shaft, the trip mechanism 100 further includes a third elastic member 170 sleeved on the mounting shaft, one end of the third elastic member 170 abuts against the transmission member 160, the other end abuts against the housing 210, and the third elastic member 170 is used for providing a restoring force for the movement of the transmission member 160 relative to the housing 210, so as to provide a restoring force for the handle 220 and the trip member 130 that are in driving connection with the transmission member 160.

In this embodiment, as shown in fig. 1 to 3, the circuit breaker 200 further includes an electromagnetic release 270, a coil of the electromagnetic release 270 is connected with one end of the moving contact 230, which is far away from the fixed contact 240, through a first flexible connection line 271, a first protrusion 121 is disposed on the latch member 120 of the release mechanism 100, the electromagnetic release 270 corresponds to the position of the release mechanism 100, and when the current is shorted, an ejector rod of the electromagnetic release 270 pushes the first protrusion 121 to drive the latch member 120 to trip the latch member 130 of the release mechanism 100, so as to separate the moving contact 230 from the fixed contact 240.

In this embodiment, as shown in fig. 1 to 3, the circuit breaker 200 further includes a thermal trip 280 located at a side of the electromagnetic trip 270 away from the handle 220, the fixed end of the thermal trip 280 is connected to the output terminal 260 through a second flexible connection wire 281, the movable end of the thermal trip 280 is connected to one end of the coil of the electromagnetic trip 270 away from the moving contact 230, the latch 120 is further provided with a second protrusion 122, the thermal trip 280 corresponds to the trip mechanism 100 in position, and when the current is overloaded, the movable end of the thermal trip 280 pushes the second protrusion 122 to drive the latch 120 to trip with the trip 130 of the trip mechanism 100, so as to separate the moving contact 230 from the fixed contact 240. The thermal trip 280 may be a bimetal, for example, made of a material having a thermal expansion coefficient, so that when the temperature increases, the bimetal is deformed by thermal expansion, and the moving contact 230 is driven to move towards a side far from the fixed contact 240, so that the circuit breaker 200 is opened.

It should be noted that, since the coil of the electromagnetic release 270 is connected to the end of the moving contact 230, which is far away from the fixed contact 240, through the first flexible connection line 271, when the circuit breaker 200 is internally arranged, only the electromagnetic release 270 and the moving contact 230 need to be made to be as close as possible to facilitate the wiring of the first flexible connection line 271, and the electromagnetic release 270 corresponds to the position of the release mechanism 100, it is necessary to ensure that when the current is shorted, the ejector rod of the electromagnetic release 270 can drive the latch 120 and the latch 130 of the release mechanism 100 by pushing the first protrusion 121.

Similarly, since the fixed end of the thermal trip 280 is connected to the output terminal 260 through the second flexible connection wire 281, when the circuit breaker 200 is internally laid out, only the thermal trip 280 and the output terminal 260 need to be located as close as possible to facilitate the wiring of the second flexible connection wire 281, and the thermal trip 280 corresponds to the trip mechanism 100, so that it is required to ensure that the movable end of the thermal trip 280 can be tripped by pushing the second protrusion 122 to drive the latch 120 and the trip 130 of the trip mechanism 100 when the current is overloaded. Illustratively, in the present embodiment, the extending direction of the ejector rod of the electromagnetic trip 270 and the extending direction of the thermal trip 280 before being not deformed by heat are parallel to each other, and the thermal trip 280 is located on the side of the electromagnetic trip 270 away from the handle 220 to be closer to the output terminal 260.

In this embodiment, as shown in fig. 8 and 9, the moving contact 230 includes a contact portion 231 and a welding portion 232, so that the contact portion 231 contacts with or separates from the fixed contact 240, thereby enabling the circuit breaker 200 to switch on or off, and meanwhile, the moving contact is electrically connected with the electromagnetic release 270 through the welding portion 232. Besides, the moving contact 230 is further provided with a mounting hole 233, a connecting hole 234 and a yielding hole 235, wherein the second rotating shaft 112 is assembled in the mounting hole 233, so that the moving contact 230 is rotationally connected with the bracket 110, one end of the second elastic member 150 passes through the yielding hole 113 on the bracket 110 and is connected with the connecting hole 234 of the moving contact 230, so that the moving contact 230 is propped against the bracket 110, the yielding hole 235 corresponds to the first rotating shaft 111 on the bracket 110 in position, and the first rotating shaft 111 is yielding through the yielding hole 235, so that the moving contact 230 is prevented from interfering the relative movement of the locking piece 120 and the jump piece 130, and the bracket 110 and the shell 210.

In addition, as shown in fig. 8 and 9, in this embodiment, a limiting protrusion 236 is further disposed on the moving contact 230 near the welding portion 232 (or on the side far from the contact portion 231/the fixed contact 240), and since the moving contact 230 and the locking member 120 are located on the same side of the bracket 110, the moving contact 230 and the locking member 120 may interfere with each other, and on the basis of the foregoing requirement that the height of the second rotating shaft 112 is greater than the sum of the thickness of the moving contact 230 and the thickness of the snap member 130, in order to further prevent the moving contact 230 from pushing the locking member 120 to move towards the side near the adjacent housing 210, the limiting protrusion 236 ensures that the moving contact 230 always faces the side near the bracket 110 to be close to the surface of the bracket 110, thereby ensuring that a certain gap exists between the locking member 120 and the adjacent housing 210, and further ensuring that the movement of the locking member 120 is smoother without blocking.

The transmission action of the tripping mechanism 100 is explained with the circuit breaker 200 in an initial state when the circuit breaker 200 is in a breaking state, when the circuit breaker 200 is to be switched on, because the latch 120 and the trip 130 are buckled with each other (as shown in fig. 4 and 5), the latch 120 and the trip 130, the latch 120 and the bracket 110, and the trip 130 and the bracket 110 are all fixed, and because one end of the moving contact 230 away from the fixed contact 240 (or one end of the moving contact 230 near the first rotating shaft 111 of the bracket 110) is abutted against the bracket 110, the moving contact 230 and the bracket 110 are fixed, in other words, the bracket 110, the latch 120, the trip 130 and the moving contact 230 form a whole, so that when the handle 220 is driven by external force, the moving contact 230 can be driven to move towards one side near the fixed contact 240 through the cooperation of the bracket 110, the latch 120 and the trip 130; when the breaker 200 encounters a fault and needs to be opened, the thermal release 280 or the electromagnetic release 270 correspondingly pushes the first protrusion 121 or the second protrusion 122 on the latch 120, so that the latch 120 rotates relative to the bracket 110 to drive the latch 120 and the latch 130 to release the latch (as shown in fig. 6), so that the bracket 110, the latch 120, the latch 130 and the moving contact 230 are separated, the latch 120 resets relative to the bracket 110 under the action of the first elastic member 140, the moving contact 230 resets relative to the housing 210 under the action of the second elastic member 150, and the transmission member 160 drives the latch 130 to reset relative to the housing 210 under the action of the third elastic member 170, so that the bracket 110 resets relative to the housing 210 under the combined action of the latch 120, the moving contact 230 and the latch 130.

In this embodiment, as shown in fig. 1 to 3, the circuit breaker 200 further includes an arc extinguishing mechanism 290 located on a side of the thermal trip 280 away from the electromagnetic trip 270, the arc extinguishing mechanism 290 includes a first arc striking plate 291 and a second arc striking plate 292 disposed opposite to each other, and an arc extinguishing chamber 293 located between the first arc striking plate 291 and the second arc striking plate 292, an inlet of the arc extinguishing chamber 293 is disposed opposite to the moving contact 230 and the fixed contact 240, and an outlet of the arc extinguishing chamber 293 faces a side close to the output terminal 260 and is electrically insulated from the output terminal 260.

When the circuit breaker 200 is internally arranged, since the arc generated between the moving contact 230 and the fixed contact 240 during the opening operation needs to be introduced into the arc extinguishing mechanism 290 to extinguish the arc by the arc extinguishing mechanism 290, the arc extinguishing mechanism 290 includes a first arc striking plate 291 and a second arc striking plate 292 which are disposed opposite to each other, and an arc extinguishing chamber 293 disposed between the first arc striking plate 291 and the second arc striking plate 292, wherein an inlet of the arc extinguishing chamber 293 is disposed opposite to the moving contact 230 and the fixed contact 240, and an outlet of the arc extinguishing chamber 293 faces to a side close to the output terminal 260 and is electrically insulated from the output terminal 260. In this way, in the opening process of the circuit breaker 200, the electric arc generated between the moving contact 230 and the fixed contact 240 can be guided into the arc extinguishing chamber 293 through the inlet of the arc extinguishing chamber 293 to be extinguished rapidly by the mutual cooperation of the first arc striking plate 291 and the second arc striking plate 292, and the gas generated after arc extinguishing can be discharged out of the casing 210 through the outlet of the arc extinguishing chamber 293, so that the electrical loss of the electric arc to the circuit breaker 200 can be reduced, and meanwhile, the electrical interference caused by the gas generated after arc extinguishing to the output terminal 260 which is adjacently arranged with the arc extinguishing chamber 293 can be avoided, thereby improving the service life of the circuit breaker 200.

As shown in fig. 1 and 2, during the closing or opening process of the circuit breaker 200, an arc generated between the moving contact 230 and the fixed contact 240 at the front end can enter the arc extinguishing chamber 293 at the rear end through the inlet of the arc extinguishing chamber 293 to extinguish the arc, and high-pressure gas generated after the arc is extinguished can enter the exhaust passage at the rear end through the outlet of the arc extinguishing chamber 293 to cool and finally be discharged out of the circuit breaker 200. However, since a certain movement space is reserved between the moving contact 230 and the fixed contact 240, so that the moving contact 230 moves toward a side close to or far from the fixed contact 240, and the air pressure in the movement space is similar to the air pressure between the first striking plate 291 and the second striking plate 292, a phenomenon that high-pressure air generated by an arc flows back toward the movement space may be caused, thereby affecting the arc extinguishing capability and the arc extinguishing effect of the circuit breaker 200.

In order to solve the above-mentioned problems, as shown in fig. 1 to 7, in the present embodiment, an arc-shaped partition 114 is provided on the bracket 110, two ends of the arc-shaped partition 114 respectively correspond to positions of the moving contact 230 and the fixed contact 240 when the circuit breaker 200 is in the opening state, and the arc-shaped partition 114 is used for limiting the passage of gas generated by the arc extinguishing mechanism 290 of the circuit breaker 200. Specifically, when the circuit breaker 200 is to be switched on, since the bracket 110, the latch 120, the latch 130 and the moving contact 230 form a whole, the arc-shaped partition 114 on the bracket 110 can move synchronously with the moving contact 230 moving toward the side close to the fixed contact 240 until the moving contact 230 contacts the fixed contact 240; when the circuit breaker 200 is to be opened, the bracket 110, the latch 120, the trip member 130 and the moving contact 230 are separated, so that the arc-shaped partition 114 on the bracket 110 can be reset relative to the housing 210 under the combined action of the latch 120, the moving contact 230 and the trip member 130.

Because the moving contact 230 rotates relative to the fixed contact 240, the movement track of the moving contact is arc-shaped, and therefore, the arc-shaped partition 114 rotates relative to the fixed contact 240, and the movement track of the moving contact is arc-shaped, wherein the geometric center of the movement track of the arc-shaped partition 114 is the rotation center of the bracket 110 relative to the housing 210. On this basis, in order to ensure the realisation of the movement of the arc-shaped partition 114 with respect to the stationary contact 240, the cross-sectional shape of the arc-shaped partition 114 is also arc-shaped. When the moving contact 230 rotates toward the side close to the fixed contact 240, the distance between the moving contact 230 and the fixed contact 240 is gradually reduced, and when the moving contact 230 rotates toward the side far from the fixed contact 240, the distance between the moving contact 230 and the fixed contact 240 is gradually increased, so that the arc-shaped partition 114 can shield the gap between the moving contact 230 and the fixed contact 240 when the distance between the moving contact 230 and the fixed contact 240 is minimized and maximized, and therefore, two ends of the arc-shaped partition 114 correspond to the positions of the moving contact 230 and the fixed contact 240 when the circuit breaker 200 is in the opening state.

Alternatively, as shown in fig. 1 to 3, an adjusting member 211 is provided on the housing 210, and an end of the adjusting member 211 abuts against the first striking plate 291 for adjusting a distance between the movable end of the thermal trip 280 and the trip mechanism 100, so that an overload protection operating current of the circuit breaker 200 can be adjusted. Wherein the adjustment member 211 may be an adjustment screw to adjust the distance between the movable end of the thermal trip 280 and the trip mechanism 100 by screwing.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The tripping mechanism (100) is characterized by comprising a bracket (110), a locking piece (120) and a tripping piece (130), wherein the bracket (110), the locking piece (120) and the tripping piece (130) are respectively arranged in a shell (210) of a circuit breaker (200), the bracket (110) is respectively in rotary connection with the shell (210), the locking piece (120), the tripping piece (130) and a moving contact (230) of the circuit breaker (200), the locking piece (120) is used for being buckled with the locking piece (130), the locking piece (130) is in transmission connection with a handle (220) of the circuit breaker (200), and the handle (220) is driven to drive the moving contact (230) to be switched on or switched off with a fixed contact (240) of the circuit breaker (200) through the cooperation of the bracket (110), the locking piece (120) and the tripping piece (130);

wherein the jump fastener (130) and the moving contact (230) are coaxially and rotatably connected to the bracket (110).

2. The trip mechanism (100) according to claim 1, wherein a first rotating shaft (111) and a second rotating shaft (112) are respectively arranged on the support (110), a yielding hole (235) is formed in the moving contact (230) corresponding to the first rotating shaft (111), the moving contact (230) is rotationally connected with the support (110) through the second rotating shaft (112), the support (110) is rotationally connected with the housing (210) through the first rotating shaft (111), the locking piece (120) is rotationally connected with the support (110) through the first rotating shaft (111), the locking piece (120) is located between the moving contact (230) and the housing (210), the locking piece (130) is rotationally connected with the support (110) through the second rotating shaft (112), and the locking piece (130) is located between the moving contact (230) and the housing (210).

3. The trip mechanism (100) of claim 1, wherein an arc-shaped partition plate (114) is disposed on the bracket (110), two ends of the arc-shaped partition plate (114) respectively correspond to positions of the moving contact (230) and the fixed contact (240) when the circuit breaker (200) is in a breaking state, and the arc-shaped partition plate (114) is used for limiting gas generated by an arc extinguishing mechanism (290) of the circuit breaker (200) to pass through.

4. The trip mechanism (100) of claim 2, wherein the trip mechanism (100) further comprises a first elastic member (140) sleeved on the first rotating shaft (111), one end of the first elastic member (140) is abutted against the locking member (120), the other end is abutted against the bracket (110), and the first elastic member (140) is used for providing a restoring force for the movement of the locking member (120) relative to the bracket (110);

the tripping mechanism (100) further comprises a second elastic piece (150) sleeved on the first rotating shaft (111), one end of the second elastic piece (150) is propped against the moving contact (230), the other end of the second elastic piece is propped against the shell (210), and the second elastic piece (150) is used for providing a reset force for the movement of the moving contact (230) relative to the shell (210).

5. The trip mechanism (100) according to claim 4, wherein the bracket (110) is further provided with a through hole (113), the through hole (113) is located between the first rotating shaft (111) and the second rotating shaft (112), and one end of the second elastic member (150) passes through the through hole (113) to abut against the moving contact (230), so that the moving contact (230) abuts against the bracket (110).

6. The trip mechanism (100) of claim 1, wherein the trip mechanism (100) further comprises a transmission member (160) rotatably disposed within the housing (210), the handle (220) is drivingly connected to the trip member (130) through the transmission member (160), the transmission member (160) is connected to the trip member (130) through a first link (161), and the handle (220) is connected to the transmission member (160) through a gear (162) or a second link;

the novel trip mechanism is characterized in that an installation shaft is arranged on the transmission member (160), the transmission member (160) is rotationally connected with the shell (210) through the installation shaft, the trip mechanism (100) further comprises a third elastic member (170) sleeved on the installation shaft, one end of the third elastic member (170) is propped against the transmission member (160), the other end of the third elastic member is propped against the shell (210), and the third elastic member (170) is used for providing a reset force for the motion of the transmission member (160) relative to the shell (210).

7. A circuit breaker (200) characterized by comprising a shell (210), and a handle (220), a moving contact (230), a fixed contact (240), an input terminal (250), an output terminal (260) and a tripping mechanism (100) according to any one of claims 1-6, wherein the handle (220) is arranged in the shell (210), the input terminal (250) and the output terminal (260) are respectively used for being plugged into a distribution box, and the handle (220) is driven to drive the moving contact (230) and the fixed contact (240) to be switched on or off through the tripping mechanism (100);

the input terminal (250) and the output terminal (260) are arranged on the same side of the shell (210) at intervals, the handle (220) is arranged on one side of the shell (210) opposite to the input terminal (250), and when the circuit breaker (200) is in closing, one surface of the handle (220) deviating from the shell (210) is flush with one surface of the shell (210) opposite to the input terminal (250).

8. The circuit breaker (200) of claim 7, wherein the circuit breaker (200) further comprises an electromagnetic release (270), a coil of the electromagnetic release (270) is connected with one end of the moving contact (230) far away from the fixed contact (240) through a first flexible connection wire (271), a first protrusion (121) is arranged on a locking piece (120) of the release mechanism (100), the electromagnetic release (270) corresponds to the position of the release mechanism (100), and when current is short-circuited, a push rod of the electromagnetic release (270) pushes the first protrusion (121) to drive the locking piece (120) to be unlocked from a locking piece (130) of the release mechanism (100) so as to separate the moving contact (230) from the fixed contact (240).

9. The circuit breaker (200) of claim 8, wherein the circuit breaker (200) further comprises a thermal trip (280) located at a side of the electromagnetic trip (270) away from the handle (220), a fixed end of the thermal trip (280) is connected with the output terminal (260) through a second flexible connection wire (281), a movable end of the thermal trip (280) is connected with an end of a coil of the electromagnetic trip (270) away from the moving contact (230), a second protrusion (122) is further arranged on the locking piece (120), the thermal trip (280) corresponds to the position of the tripping mechanism (100), and the movable end of the thermal trip (280) pushes the second protrusion (122) to drive the locking piece (120) to trip with a buckle (130) of the tripping mechanism (100) when current is overloaded, so that the moving contact (230) and the static contact (240) are disconnected.

10. The circuit breaker (200) of claim 9, wherein the circuit breaker (200) further comprises an arc extinguishing mechanism (290) located on a side of the thermal trip (280) remote from the electromagnetic trip (270), the arc extinguishing mechanism (290) comprising oppositely disposed first and second arc striking plates (291, 292) and an arc extinguishing chamber (293) located between the first and second arc striking plates (291, 292), an inlet of the arc extinguishing chamber (293) being disposed opposite the moving contact (230) and the stationary contact (240), an outlet of the arc extinguishing chamber (293) being oriented towards a side proximate to the output terminal (260) and being electrically insulated from the output terminal (260).

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