CN216902764U - 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 lock catch piece, a trip catch piece and an arc baffle which are respectively arranged in a shell of the circuit breaker, wherein the lock catch piece, the arc baffle and a moving contact of the circuit breaker are respectively in rotating connection with the shell, the trip catch piece is in rotating connection with the moving contact, the lock catch piece and the trip catch piece are respectively arranged on the same side of the moving contact, and the arc baffle is arranged on the other side of the moving contact; the locking fastener is used for being buckled with the tripping fastener, the tripping fastener 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 the static contact of the circuit breaker through the cooperation of the locking fastener, the tripping fastener and the arc baffle. The circuit breaker 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 handle is driven to drive the moving contact and the fixed contact to be switched on or switched off through the tripping mechanism. The tripping mechanism and the circuit breaker can solve the problem that the traditional circuit breaker is large in size.

Description

Tripping mechanism and circuit breaker

Technical Field

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

Background

Along with the rapid development of social economy and urban construction, the living standard and the living standard of people are remarkably improved, and the electricity safety is more comprehensively known. In order to increase the safety of the power consumption, a circuit breaker is usually connected to the power consumption circuit. The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition within a prescribed time. When faults such as electric leakage, overload, short circuit and the like occur in the system, the circuit breaker can quickly cut off a fault circuit in the system or cut off the power supply of the whole power supply so as to prevent the expansion of the faults and avoid causing huge economic loss and casualties.

The distribution box is the last level of distribution facility in the power supply system for realize the distribution and the protection of electric energy, inlay in the wall body, the volume is less. Traditional circuit breaker wholly is type of protruding, and its binding post adopts the screw wiring usually, and circuit breaker itself is highly great, and receives the restriction of wiring direction, and the height that needs during the wiring installation is also very big. The circuit breaker adopting the screw wiring can occupy the operation space of the operation handle of the circuit breaker. In order to ensure that the operating handle has enough moving space, the whole volume of the circuit breaker is increased. The small-sized distribution box (for example, 86 bottom box, 118 bottom box, 120 bottom box, etc. are arranged as the distribution box) has a high demand for miniaturization of the circuit breaker arranged therein, and such a circuit breaker is difficult to meet the demand due to the defect of its own height, and therefore, a more miniaturized circuit breaker is required to meet the market demand.

SUMMERY OF THE UTILITY MODEL

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

The embodiment of the utility model is realized by the following steps:

on one hand, the embodiment of the utility model provides a tripping mechanism, which comprises a lock catch piece, a trip buckle piece and an arc baffle which are respectively arranged in a shell of a circuit breaker, wherein the lock catch piece, the arc baffle and a movable contact of the circuit breaker are respectively and rotatably connected with the shell, the trip buckle piece is rotatably connected with the movable contact, the lock catch piece and the trip buckle piece are respectively arranged on the same side of the movable contact, and the arc baffle is arranged on the other side of the movable contact; the handle is driven to drive the moving contact and the fixed contact of the breaker to be switched on or switched off through the cooperation of the locking piece, the tripping piece and the arc baffle. The tripping mechanism can solve the problem that the traditional circuit breaker is large in size.

Optionally, the tripping mechanism further includes a first rotating shaft fixedly disposed in the housing, the locking element and the arc baffle are respectively rotatably connected to the housing through the first rotating shaft, an arc hole is disposed on the moving contact, the arc hole is slidably sleeved in the first rotating shaft, so that the moving contact is rotatably connected to the housing, a second rotating shaft is further disposed on the moving contact, the tripping element is rotatably connected to the moving contact through the second rotating shaft, and the arc hole and the second rotating shaft are concentrically disposed.

Optionally, the tripping mechanism further includes a first elastic element sleeved on the first rotating shaft, one end of the first elastic element abuts against the locking element, the other end of the first elastic element abuts against the arc baffle, the first elastic element is configured to provide a reset force for the movement of the locking element relative to the arc baffle, and the first elastic element is further configured to enable the locking element and the tripping element to abut against each other, and the arc baffle and the moving contact to abut against each other.

Optionally, the tripping mechanism further includes a second elastic member sleeved on the first rotating shaft, one end of the second elastic member abuts against the moving contact, the other end of the second elastic member abuts against the housing, and the second elastic member is configured to provide a resetting force for the movement of the moving contact relative to the housing.

Optionally, a connecting hole is formed in the moving contact, the connecting hole is located between the first rotating shaft and the second rotating shaft, an avoiding hole is correspondingly formed in the arc baffle, and one end of the second elastic piece penetrates through the avoiding hole and abuts against the connecting hole of the moving contact, so that the moving contact abuts against the first rotating shaft.

Optionally, the tripping mechanism further comprises a transmission member rotatably arranged in the housing, the handle is in transmission connection with the tripping member through the transmission member, the transmission member is connected with the tripping member through a first connecting rod, and the handle is connected with the transmission member through a gear or a second connecting rod; the tripping mechanism comprises a transmission part, a shell, a tripping mechanism and a first elastic part, wherein the transmission part is provided with an installation shaft, the transmission part is rotatably connected with the shell through the installation shaft, the tripping mechanism further comprises a third elastic part sleeved on the installation shaft, one end of the third elastic part is abutted against the transmission part, the other end of the third elastic part is abutted against the shell, and the third elastic part is used for providing resetting force for the transmission part to move relative to the shell.

Optionally, an arc blocking portion is disposed on the arc blocking plate, two ends of the arc blocking portion respectively correspond to the moving contact and the static contact when the circuit breaker is in an open state, and the arc blocking portion is configured to limit gas generated by an arc extinguishing mechanism of the circuit breaker from passing through.

On the other hand, the embodiment of the utility model provides a circuit breaker, which comprises a shell, and a handle, a moving contact, a static 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 plugged with a distribution box, and the handle is driven to drive the moving contact and the static contact to be switched on or switched off through the tripping mechanism; 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, opposite to the input terminal, of the shell, and when the circuit breaker is closed, one side, deviating from the shell, of the handle is flush with the side, opposite to the input terminal, of the shell. The tripping mechanism can solve the problem that the traditional circuit breaker is large in size.

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

Optionally, the circuit breaker further includes a thermal release located on one side of the electromagnetic release far away from the handle, a fixed end of the thermal release is connected with the output terminal through a second flexible connecting wire, a movable end of the thermal release is connected with one end of a coil of the electromagnetic release far away from the moving contact, a second protrusion is further disposed on the locking piece, the thermal release corresponds to the tripping mechanism, and when the current is overloaded, the movable end of the thermal release pushes the second protrusion to drive the locking piece to be unlocked with the tripping piece of the tripping mechanism, so that the moving contact and the fixed contact are separated from the brake.

Optionally, the circuit breaker still includes to be located the thermal release is kept away from the arc extinguishing mechanism of one side of electromagnetic release, arc extinguishing mechanism includes relative first run-on plate and the second run-on plate that sets up and is located the explosion chamber between first run-on plate and the second run-on plate, the entry of explosion chamber with the moving contact with the static contact is relative setting, the export orientation of explosion chamber is close to one side of output terminal and with output terminal electrical insulation.

The embodiment of the utility model has the beneficial effects that:

the tripping mechanism comprises a lock catch piece, a trip catch piece and an arc baffle which are respectively arranged in a shell of the circuit breaker, wherein the lock catch piece, the arc baffle and a moving contact of the circuit breaker are respectively in rotating connection with the shell, the trip catch piece is in rotating connection with the moving contact, the lock catch piece and the trip catch piece are respectively arranged on the same side of the moving contact, and the arc baffle is arranged on the other side of the moving contact; the locking fastener is used for being buckled with the tripping fastener, the tripping fastener 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 the fixed contact of the circuit breaker through the cooperation of the locking fastener, the tripping fastener and the arc baffle. Wherein, hasp spare and jump the fastener and set up respectively in the same one side of moving contact, and the arc baffle sets up in the opposite side of moving contact, can make this tripping device's concrete structure and installation cooperation simpler to make this tripping device's occupation space littleer, the transmission action is simpler simultaneously, helps realizing the miniaturization of circuit breaker, is favorable to realizing automated production.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

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 in a manual opening state according to an embodiment of the present invention;

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

fig. 4 is a schematic structural view of the locking member and the jumping member provided in the embodiment of the present invention in a fastened state;

fig. 5 is a schematic structural view of the locking member and the trip member in an unlocked state according to the embodiment of the present invention;

fig. 6 is a schematic structural diagram of an arc baffle of the trip mechanism according to the embodiment of the present invention;

fig. 7 is a schematic structural diagram of a movable contact of a circuit breaker according to an embodiment of the present invention;

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

fig. 9 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention.

Icon: 100-a trip mechanism; 110-an arc baffle; 111-avoiding holes; 112-an arc stop; 120-a catch member; 121-a first protrusion; 122-a second protrusion; 130-snap fasteners; 140-a first resilient member; 150-a second elastic member; 160-a transmission; 161-a first link; 162-gear; 170-a third elastic member; 200-a circuit breaker; 210-a housing; 211-a first shaft; 212-an adjustment member; 220-a handle; 230-moving contact; 231-a contact part; 232-a weld; 233-connecting hole; 234-mounting holes; 235-a second rotating shaft; 236-an arc-shaped hole; 237-limit bump; 240-fixed contact; 250-an input terminal; 260-output terminals; 270-an electromagnetic release; 271-a first flexible connection line; 280-thermal trip; 281-a second flexible connection line; 290-arc extinguishing mechanism; 291-a first arc runner; 292-a second arc ignition plate; 293-arc extinguishing chamber.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the description refers must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the 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 otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be internal to both elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 9, an embodiment of the present application provides a circuit breaker 200, including a housing 210, and a handle 220, a movable contact 230, a fixed contact 240, an input terminal 250, an output terminal 260, and a trip mechanism 100, which are disposed in the housing 210, where 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 movable contact 230 and the fixed contact 240 to switch on or switch off through the trip mechanism 100; the input terminal 250 and the output terminal 260 are disposed at the same side of the housing 210 at an interval, the handle 220 is disposed at one side of the housing 210 opposite to the input terminal 250, and when the circuit breaker 200 is closed, one surface of the handle 220 facing away from the housing 210 is flush with one 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.

It should be noted that, as shown in fig. 1 to fig. 3, the housing 210 may be two sub-housings 210 disposed oppositely, and the two sub-housings 210 together enclose an accommodating space for accommodating 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 input and output terminals 250 and 260 disposed within the housing 210. for example, the input and output terminals 250 and 260 may be plug terminals such that the input terminal 250 can be plugged into a row of input terminals within the distribution box and the output terminal 260 can be plugged into a row of output terminals within the distribution box to plug the circuit breaker 200 into a consumer circuit having a load.

In order to realize the breaking function of the circuit breaker 200, as shown in fig. 1 to fig. 3, the circuit breaker 200 further includes a handle 220, a movable contact 230, a fixed contact 240 and a trip mechanism 100, the handle 220 is rotatably connected to the housing 210 so that the handle 220 can rotate relative to the housing 210, the handle 220 is in transmission connection with the movable contact 230 through the trip mechanism 100, the fixed contact 240 is fixedly connected to the housing 210, the movable contact 230 is connected to the output terminal 260, and the fixed contact 240 is connected to the input terminal 250 so that the handle 220 can drive the trip mechanism 100 to move when being driven by an external force, thereby driving the movable contact 230 to approach or move away from the fixed contact 240, and further enabling the circuit breaker 200 to realize closing or opening. The handle 220 is in transmission connection with the movable contact 230 through the trip mechanism 100, and may establish a transmission relationship all the time or only when needed.

Specifically, as shown in fig. 1 and fig. 2, when the movable contact 230 moves toward a side close to the fixed contact 240, so that the movable contact 230 contacts with the fixed contact 240, the circuit breaker 200 can 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 movable contact 230, the output terminal 260, and the output terminal row can be switched on; when the moving contact 230 moves towards a side away from the fixed contact 240 to separate the moving contact 230 from the fixed contact 240, the circuit breaker 200 can be switched off, 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 can be disconnected, so that switching between a conducting state and a disconnecting state of a load is realized through the circuit breaker 200.

In addition, the input terminal 250 and the output terminal 260 are respectively disposed at intervals on the same side of the housing 210 (as shown in fig. 1 to 3, the input terminal 250 and the output terminal 260 are respectively disposed below the housing 210), so that the function of entering from the same side and exiting from the same side can be realized. The conducting direction of the circuit breaker 200 (or the side of the housing 210 where the input terminal 250 and the output terminal 260 are provided) is used as a rear end, i.e., a rear-to-rear connection form is formed, so as to improve the convenience of connection when the circuit breaker 200 is plugged into a distribution box. In addition, the input terminal 250 and the output terminal 260 are arranged at intervals, so that the distance between the incoming line and the outgoing line can be increased, and the 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 when the circuit breaker 200 is in a manual closing state, 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; when the circuit breaker 200 is in the manual opening state, a face of the handle 220 facing away from the housing 210 and a face of the housing 210 opposite to the input terminal 250 form an included angle. On the basis of ensuring that the handle 220 can drive the moving contact 230 and the fixed contact 240 to be switched on or switched off through the tripping mechanism 100, the smaller the angle of the included angle is, the smaller the operating space of the handle 220 is, so that the smaller the volume of the circuit breaker 200 is. Illustratively, the included angle may be less than 30 °.

As shown in fig. 4 and 5, the trip mechanism 100 includes a locking element 120, a trip element 130 and an arc baffle 110 respectively disposed in a housing 210 of the circuit breaker 200, the locking element 120, the arc baffle 110 and a movable contact 230 of the circuit breaker 200 are respectively rotatably connected to the housing 210, the trip element 130 is rotatably connected to the movable contact 230, the locking element 120 and the trip element 130 are respectively disposed on the same side of the movable contact 230, and the arc baffle 110 is disposed on the other side of the movable contact 230; the locking element 120 is used for being buckled with the tripping element 130, the tripping element 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 locking element 120, the tripping element 130 and the arc baffle 110. The locking element 120 and the trip element 130 are respectively arranged on the same side of the movable contact 230, and the arc baffle 110 is arranged on the other side of the movable contact 230, so that the specific structure and the installation cooperation of the tripping mechanism 100 are simpler, the occupied space of the tripping mechanism 100 is smaller, the transmission action is simpler, the miniaturization of the circuit breaker 200 is facilitated, and the realization of automatic production is facilitated.

Specifically, as shown in fig. 4 to 8, the trip mechanism 100 further includes a first rotating shaft 211 fixedly disposed in the housing 210, the locking element 120 and the arc baffle 110 are respectively rotatably connected to the housing 210 through the first rotating shaft 211, the movable contact 230 is provided with an arc hole 236, the arc hole 236 is slidably sleeved on the first rotating shaft 211 to rotatably connect the movable contact 230 to the housing 210, the movable contact 230 is further provided with a second rotating shaft 235, the trip element 130 is rotatably connected to the movable contact 230 through the second rotating shaft 235, the arc hole 236 and the second rotating shaft 235 are concentrically disposed, so that a distance between the first rotating shaft 211 and the second rotating shaft 235 is always unchanged, or a projection of the arc hole 236 on the movable contact 230 falls on a circular track with the second rotating shaft 235 as a center and a distance between the first rotating shaft 211 and the second rotating shaft 235 as a radius. When the latch is installed, the first rotating shaft 211 may be assembled on the housing 210, the arc baffle 110 is sleeved on the first rotating shaft 211, the movable contact 230 is connected to the first rotating shaft 211 through the arc hole 236, and finally the latch 120 is sleeved on the first rotating shaft 211 and the trip 130 is sleeved on the second rotating shaft 235. The second rotating shaft 235 may be a riveting column, a rivet, or other existing products, so as to fix the second rotating shaft 235 on the movable contact 230.

The height of the first rotating shaft 211 needs to be greater than the sum of the thickness of the locking element 120, the thickness of the arc baffle 110 and the thickness of the movable contact 230, so that after the arc baffle 110 is sleeved on the first rotating shaft 211, the locking element 120 and the movable contact 230 can be sleeved on the first rotating shaft 211, and meanwhile, a certain gap can be formed between the locking element 120 and the adjacent shell 210, so as to prevent the shell 210 from interfering with the relative movement of the locking element 120, the trip element 130 and the arc baffle 110. Similarly, the height of the second rotating shaft 235 needs to be greater than the thickness of the snap fastener 130, so that the snap fastener 130 can be sleeved on the second rotating shaft 235, and meanwhile, a certain gap is formed between the snap fastener 130 and the adjacent housing 210, so as to prevent the housing 210 from interfering with the relative movement of the snap fastener 130, the locking fastener 120 and the arc baffle 110.

In order to enable the locking element 120 to restore its initial state in the process of closing and opening the moving contact 230 and the static contact 240, as shown in fig. 4 and 5, in this embodiment, the trip mechanism 100 further includes a first elastic element 140 sleeved on the first rotating shaft 211, one end of the first elastic element 140 abuts against the locking element 120, and the other end abuts against the arc baffle 110, the first elastic element 140 is used for providing a restoring force for the movement of the locking element 120 relative to the arc baffle 110, in addition, the first elastic element 140 is further used for respectively abutting the locking element 120 and the trip element 130, and the arc baffle 110 and the moving contact 230, so that the locking element 120, the trip element 130, the arc baffle 110 and the moving contact 230 can form a whole, and the moving contact 230 is driven by the handle 220 to close the switch.

In order to enable the movable contact 230 to recover its initial state during the switching on and off processes of the movable contact 230 and the fixed contact 240, in this embodiment, as shown in fig. 4 and 5, the trip mechanism 100 further includes a second elastic element 150 sleeved on the first rotating shaft 211, one end of the second elastic element 150 abuts against the movable contact 230, and the other end abuts against the housing 210, and the second elastic element 150 is configured to provide a restoring force for the movement of the movable contact 230 relative to the housing 210.

In this embodiment, as shown in fig. 4 to 8, the movable contact 230 is provided with a connection hole 233, the connection hole 233 is located between the first rotation shaft 211 and the second rotation shaft 235, the arc baffle 110 is correspondingly provided with an avoiding hole 111, and one end of the second elastic element 150 passes through the avoiding hole 111 and abuts against the connection hole 233 of the movable contact 230, so that the movable contact 230 abuts against the first rotation shaft 211. In this way, the second elastic element 150 can enable one end of the movable contact 230 far from the fixed contact 240 (or one end of the movable contact 230 close to the first rotating shaft 211) and the first rotating shaft 211 to abut against each other, so as to provide a contact pressure during closing and a reset force during opening for the movable contact 230 through the second elastic element 150.

Optionally, 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 the present embodiment, a toothed portion is provided on the handle 220, and a corresponding gear 162 is provided on the transmission member 160, and the toothed portion and the gear 162 are engaged with each other, so that the handle 220 is in transmission connection with the transmission member 160. Compared with a transmission mode of a connecting rod, the transmission mode of the gear 162 can save the moving space.

In order to enable the transmission element 160 to recover its initial state during the switching on and switching off processes of the moving contact 230 and the static contact 240, in this embodiment, as shown in fig. 1 to fig. 3, an installation shaft is disposed on the transmission element 160, the transmission element 160 is rotatably connected to the housing 210 through the installation shaft, the trip mechanism 100 further includes a third elastic element 170 sleeved on the installation shaft, one end of the third elastic element 170 abuts against the transmission element 160, the other end abuts against the housing 210, and the third elastic element 170 is configured to provide a restoring force for the movement of the transmission element 160 relative to the housing 210.

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 to one end of the movable 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 locking member 120 of the trip mechanism 100, the electromagnetic release 270 corresponds to the trip mechanism 100, and when a current is short-circuited, a top rod of the electromagnetic release 270 pushes the first protrusion 121 to drive the locking member 120 to trip the trip member 130 of the trip mechanism 100, so as to separate the movable contact 230 and the fixed contact 240.

In this embodiment, as shown in fig. 1 to fig. 3, the circuit breaker 200 further includes a thermal trip unit 280 located on a side of the electromagnetic trip unit 270 away from the handle 220, a fixed end of the thermal trip unit 280 is connected to the output terminal 260 through a second flexible connection line 281, a movable end of the thermal trip unit 280 is connected to one end of the coil of the electromagnetic trip unit 270 away from the movable contact 230, a second protrusion 122 is further disposed on the locking member 120, the thermal trip unit 280 corresponds to the trip mechanism 100, and when the current is overloaded, the movable end of the thermal trip unit 280 pushes the second protrusion 122 to drive the locking member 120 to trip the trip unit 130 of the trip mechanism 100, so as to enable the movable contact 230 and the stationary contact 240 to be separated from each other. The thermal trip unit 280 may be a bimetal, for example, made of a material having a thermal expansion coefficient, so that when the temperature rises, the bimetal is deformed by thermal expansion, and the moving contact 230 is driven to move toward a side away from the stationary contact 240, so as to open the circuit breaker 200.

It should be noted that, since the coil of the electromagnetic trip 270 is connected to the end of the movable contact 230 far from the fixed contact 240 through the first soft connection line 271, when the circuit breaker 200 is internally disposed, it is only necessary to make the electromagnetic trip 270 and the movable contact 230 as close as possible to facilitate the wiring of the first soft connection line 271, and the electromagnetic trip 270 corresponds to the position of the trip mechanism 100, so that it is required to ensure that the top rod of the electromagnetic trip 270 can drive the locking piece 120 to be unlocked from the trip piece 130 of the trip mechanism 100 by pushing the first protrusion 121 when the current is short-circuited.

Similarly, since the fixed end of the thermal trip unit 280 is connected to the output terminal 260 through the second flexible connecting line 281, when the circuit breaker 200 is disposed inside, it is only necessary to make the thermal trip unit 280 and the output terminal 260 be as close as possible to facilitate the wiring of the second flexible connecting line 281, and the thermal trip unit 280 corresponds to the trip mechanism 100, so that it is necessary to ensure that the movable end of the thermal trip unit 280 can drive the latch 120 to trip the trip unit 130 of the trip mechanism 100 by pushing the second protrusion 122 when the current is overloaded. Illustratively, in the present embodiment, the extending direction of the top bar of the electromagnetic release 270 and the extending direction of the thermal release 280 before being deformed by heat are parallel to each other, and the thermal release 280 is located on the side of the electromagnetic release 270 away from the handle 220 to be closer to the output terminal 260.

In this embodiment, as shown in fig. 7 and 8, the movable contact 230 includes a contact portion 231 and a welding portion 232, so as to be in contact with or separated from the stationary contact 240 through the contact portion 231, so that the circuit breaker 200 is switched on or switched off, and meanwhile, the movable contact is electrically connected to the electromagnetic trip 270 through the welding portion 232. In addition, the movable contact 230 is further provided with a mounting hole 234 and a connecting hole 233, wherein the second rotating shaft 235 is assembled in the mounting hole 234, so that the trip device 130 is rotatably connected with the movable contact 230 through the second rotating shaft 235, and one end of the second elastic element 150 passes through the avoiding hole 111 on the arc baffle 110 to be connected with the connecting hole 233 of the movable contact 230, so that the movable contact 230 is abutted against the first rotating shaft 211.

In addition, as shown in fig. 7, in the present embodiment, a position-limiting protrusion 237 is further disposed on the movable contact 230 near the welding portion 232 (or far from the side of the contact portion 231/the fixed contact 240), since the movable contact 230 and the locking member 120 are located on the same side of the arc barrier 110, the movable contact 230 and the locking member 120 may interfere with their respective movements, on the basis of the foregoing requirement that the height of the first rotating shaft 211 is greater than the sum of the thickness of the locking member 120, the thickness of the arc baffle 110 and the thickness of the movable contact 230, to further prevent the movable contact 230 from pushing the locking member 120 toward a side close to the adjacent housing 210, here, it is also ensured by the limit protrusion 237 that the movable contact 230 always faces to the side close to the arc baffle 110 and is close to the surface of the arc baffle 110, thereby ensuring a certain gap between the locking member 120 and the adjacent housing 210, and further ensuring that the locking member 120 moves more smoothly without being blocked.

Here, the driving operation of the trip mechanism 100 will be explained with the circuit breaker 200 being in the open state as the initial state, and when the circuit breaker 200 is to be closed, because the locking element 120 and the trip element 130 are fastened with each other (as shown in fig. 4), the locking element 120 and the trip element 130, the locking element 120 and the arc baffle 110, and the trip element 130 and the arc baffle 110 are all fixed, and because one end of the movable contact 230 far away from the fixed contact 240 (or one end of the movable contact 230 near the first rotating shaft 211) abuts against the first rotating shaft 211, therefore, the movable contact 230 and the arc baffle 110 are also fixed, in other words, the latch 120, the trip 130, the arc baffle 110 and the movable contact 230 form a whole, when the handle 220 is driven by an external force, the movable contact 230 can be driven to move towards one side close to the fixed contact 240 by the cooperation of the locking element 120, the trip element 130 and the arc baffle 110; when the circuit 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 locking element 120, so that the locking element 120 rotates relative to the arc baffle 110 to drive the locking element 120 and the trip element 130 to be released from the buckling (as shown in fig. 5), thereby separating the locking element 120, the trip element 130, the arc baffle 110, and the movable contact 230, respectively, and the locking element 120 resets relative to the arc baffle 110 under the action of the first elastic element 140, the movable contact 230 resets relative to the housing 210 under the action of the second elastic element 150, and the transmission element 160 drives the trip element 130 to reset relative to the housing 210 under the action of the third elastic element 170, so that the arc baffle 110 resets relative to the housing 210 under the combined action of the locking element 120, the movable contact 230, and the trip element 130.

In this embodiment, as shown in fig. 1 to fig. 3, the circuit breaker 200 further includes an arc extinguishing mechanism 290 located on a side of the thermal trip unit 280 away from the electromagnetic trip unit 270, the arc extinguishing mechanism 290 includes a first arc striking plate 291 and a second arc striking plate 292 which are oppositely disposed, 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 movable 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.

It should be noted that, when the circuit breaker 200 is disposed inside, since the arc generated between the moving contact 230 and the fixed contact 240 during opening needs to be introduced into the arc extinguishing mechanism 290 for arc extinction through 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 arranged oppositely, 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 arranged oppositely 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. So, at circuit breaker 200 breaking process, can lead to extinguishing fast in explosion chamber 293 through the entry of explosion chamber 293 with the electric arc that produces between moving contact 230 and the static contact 240 through first run-on board 291 and second run-on board 292 mutually supporting, the gas that produces after the arc extinguishing can be discharged to the casing 210 outside through the export of explosion chamber 293, thereby can alleviate the electric loss that electric arc produced circuit breaker 200, the gas that can also avoid producing after the arc extinguishing causes electric interference to the output terminal 260 that is adjacent setting with explosion chamber 293 simultaneously, and then improve circuit breaker 200's life.

As shown in fig. 1 and fig. 2, in the switching-on or switching-off process of the circuit breaker 200, an electric arc generated between the moving contact 230 and the fixed contact 240 at the front end can enter the arc extinguish chamber 293 at the rear end through an inlet of the arc extinguish chamber 293 for arc extinction, and a high-pressure gas generated after the electric arc is extinguished can enter an exhaust duct at the rear end through an outlet of the arc extinguish chamber 293 for cooling, and is finally exhausted out of the circuit breaker 200. However, a certain movement space needs to be reserved between the movable contact 230 and the fixed contact 240, so that the movable contact 230 moves towards a side close to or far from the fixed contact 240, and the air pressure in the movement space is close to the air pressure between the first arc striking plate 291 and the second arc striking plate 292, which may cause a backflow phenomenon when high-pressure gas generated by an arc flows towards the movement space, thereby affecting the arc extinguishing capability and the arc extinguishing effect of the circuit breaker 200.

In order to solve the above problem, as shown in fig. 1 to fig. 6, in the present embodiment, an arc blocking portion 112 is disposed on the arc blocking plate 110, two ends of the arc blocking portion 112 respectively correspond to the positions of the moving contact 230 and the stationary contact 240 when the circuit breaker 200 is in the open state, and the arc blocking portion 112 is used for limiting the gas generated by the arc extinguishing mechanism 290 of the circuit breaker 200 to pass through. Specifically, when the circuit breaker 200 is to be switched on, since the locking element 120, the trip element 130, the arc barrier 110 and the movable contact 230 form a whole, the arc blocking portion 112 on the arc barrier 110 can move synchronously with the movable contact 230 moving toward a side close to the fixed contact 240 until the movable contact 230 contacts the fixed contact 240; when the circuit breaker 200 is to be opened, since the locking member 120, the trip member 130, the arc baffle 110 and the movable contact 230 are separated from each other, the arc stop portion 112 on the arc baffle 110 can be reset relative to the housing 210 under the combined action of the locking member 120, the movable contact 230 and the trip member 130.

Because the moving contact 230 rotates relative to the stationary contact 240, the moving track of the moving contact is arc-shaped, and therefore, the arc-shaped stopping portion 112 rotates relative to the stationary contact 240, the moving track of the arc-shaped stopping portion 112 is also arc-shaped, wherein the geometric center of the moving track of the arc-shaped stopping portion 112 is the rotation center of the arc-blocking plate 110 relative to the housing 210. On this basis, in order to ensure the realization of the movement of the arc-shaped stopping portion 112 relative to the stationary contact 240, the cross-sectional shape of the arc-shaped stopping portion 112 is also arc-shaped. When the movable contact 230 rotates toward a side close to the fixed contact 240, the distance between the movable contact 230 and the fixed contact 240 gradually decreases, and when the movable contact 230 rotates toward a side far from the fixed contact 240, the distance between the movable contact 230 and the fixed contact 240 gradually increases, so that when the distance between the movable contact 230 and the fixed contact 240 reaches the minimum and the maximum, the arc-shaped stopping portion 112 can shield the gap between the movable contact 230 and the fixed contact 240, and therefore, two ends of the arc-shaped stopping portion 112 respectively correspond to the positions of the movable 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 212 is disposed on the housing 210, and an end of the adjusting member 212 abuts against the first arc striking plate 291 to adjust a distance between the movable end of the thermal trip unit 280 and the trip mechanism 100, so that the overload protection operating current of the circuit breaker 200 can be adjusted. The adjusting member 212 may be an adjusting screw to screw the distance between the movable end of the thermal trip unit 280 and the trip mechanism 100.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. The tripping mechanism (100) is characterized by comprising a locking fastener (120), a trip fastener (130) and an arc baffle (110) which are respectively arranged in a shell (210) of a circuit breaker (200), wherein the locking fastener (120), the arc baffle (110) and a movable contact (230) of the circuit breaker (200) are respectively in rotating connection with the shell (210), the trip fastener (130) is in rotating connection with the movable contact (230), the locking fastener (120) and the trip fastener (130) are respectively arranged on the same side of the movable contact (230), and the arc baffle (110) is arranged on the other side of the movable contact (230);

the locking fastener (120) is used for being buckled with the tripping fastener (130), the tripping fastener (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) and a static contact (240) of the circuit breaker (200) to be switched on or switched off through the cooperation of the locking fastener (120), the tripping fastener (130) and the arc baffle (110).

2. The trip mechanism (100) according to claim 1, wherein the trip mechanism (100) further includes a first rotating shaft (211) fixedly disposed in the housing (210), the locking member (120) and the arc baffle (110) are rotatably connected to the housing (210) through the first rotating shaft (211), the movable contact (230) is provided with an arc-shaped hole (236), the arc-shaped hole (236) is slidably sleeved on the first rotating shaft (211) so as to rotatably connect the movable contact (230) to the housing (210), the movable contact (230) is further provided with a second rotating shaft (235), the trip member (130) is rotatably connected to the movable contact (230) through the second rotating shaft (235), and the arc-shaped hole (236) and the second rotating shaft (235) are concentrically disposed.

3. The trip mechanism (100) according to claim 2, wherein the trip mechanism (100) further comprises a first elastic member (140) sleeved on the first rotating shaft (211), one end of the first elastic member (140) abuts against the locking member (120), and the other end abuts against the arc baffle (110), the first elastic member (140) is configured to provide a restoring force for a movement of the locking member (120) relative to the arc baffle (110), and is further configured to enable the locking member (120) to abut against the trip member (130) and the arc baffle (110) to abut against the movable contact (230), respectively.

4. The trip mechanism (100) according to claim 2, wherein the trip mechanism (100) further comprises a second elastic member (150) sleeved on the first rotating shaft (211), one end of the second elastic member (150) abuts against the movable contact (230), the other end abuts against the housing (210), and the second elastic member (150) is configured to provide a restoring force for the movement of the movable contact (230) relative to the housing (210).

5. The trip mechanism (100) according to claim 4, wherein the movable contact (230) is provided with a connecting hole (233), the connecting hole (233) is located between the first rotating shaft (211) and the second rotating shaft (235), the arc baffle (110) is correspondingly provided with an avoiding hole (111), and one end of the second elastic member (150) penetrates through the avoiding hole (111) and abuts against the connecting hole (233) of the movable contact (230), so that the movable contact (230) abuts against the first rotating shaft (211).

6. The trip mechanism (100) of claim 1, wherein the trip mechanism (100) further comprises 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 in transmission connection with the trip member (130) through a first link (161), and the handle (220) is in transmission connection with the transmission member (160) through a gear (162) or a second link;

the trip mechanism (100) further comprises a third elastic piece (170) sleeved on the mounting shaft, one end of the third elastic piece (170) abuts against the transmission piece (160), the other end of the third elastic piece abuts against the shell (210), and the third elastic piece (170) is used for providing a reset force for the transmission piece (160) to move relative to the shell (210).

7. The trip mechanism (100) according to claim 1, wherein an arc stop portion (112) is disposed on the arc blocking plate (110), two ends of the arc stop portion (112) respectively correspond to the movable contact (230) and the stationary contact (240) when the circuit breaker (200) is in the open state, and the arc stop portion (112) is configured to limit gas generated by an arc extinguishing mechanism (290) of the circuit breaker (200) from passing through.

8. A circuit breaker (200), comprising a housing (210), and a handle (220), a movable contact (230), a fixed contact (240), an input terminal (250), an output terminal (260) and the trip mechanism (100) as claimed in any one of claims 1 to 7 disposed in the housing (210), wherein 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 movable contact (230) and the fixed contact (240) to switch on or off through the trip 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, opposite to the input terminal (250), of the shell (210), and when the circuit breaker (200) is closed, one face, deviating from the shell (210), of the handle (220) and one face, opposite to the input terminal (250), of the shell (210) are flush with each other.

9. The circuit breaker (200) according to claim 8, wherein the circuit breaker (200) further comprises an electromagnetic release (270), a coil of the electromagnetic release (270) is connected to one end of the movable contact (230) far away from the fixed contact (240) through a first flexible connection line (271), a first protrusion (121) is disposed on a latch member (120) of the trip mechanism (100), the electromagnetic release (270) corresponds to the trip mechanism (100), and when a current is short-circuited, a push rod of the electromagnetic release (270) pushes the first protrusion (121) to drive the latch member (120) to trip with a trip member (130) of the trip mechanism (100), so that the movable contact (230) and the fixed contact (240) are separated.

10. The circuit breaker (200) of claim 9 wherein said circuit breaker (200) further comprises a thermal trip (280) located on a side of said electromagnetic trip (270) remote from said handle (220), the fixed end of the thermal trip (280) is connected with the output terminal (260) through a second soft connecting wire (281), the movable end of the thermal release (280) is connected with one end of the coil of the electromagnetic release (270) far away from the movable contact (230), the lock catch piece (120) is also provided with a second bulge (122), the thermal release (280) corresponds to the tripping mechanism (100) in position, when the current is overloaded, the movable end of the thermal release (280) pushes the second protrusion (122) to drive the locking element (120) to be unlocked with the tripping element (130) of the tripping mechanism (100), so that the movable contact (230) and the fixed contact (240) are separated.

11. The circuit breaker (200) of claim 10, wherein the circuit breaker (200) further comprises an arc extinguishing mechanism (290) located on a side of the thermal trip unit (280) away from the electromagnetic trip unit (270), the arc extinguishing mechanism (290) comprises a first arc striking plate (291) and a second arc striking plate (292) which are oppositely arranged, 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 oppositely arranged with the movable contact (230) and the stationary 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).

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