A trip mechanism and circuit breaker

Abstract

The utility model relates to a tripping mechanism and circuit breaker relates to electrical switch technical field. The tripping mechanism includes respectively setting in the shell of circuit breaker's lock catch, trip catch and arc baffle, lock catch, arc baffle and circuit breaker's moving contact are rotatively connected with shell, trip catch is rotatively connected with moving contact, and lock catch and trip catch are respectively set in the same side of moving contact, and arc baffle is set in the other side of moving contact, lock catch is used for with trip catch and is locked, trip catch is rotatively connected with circuit breaker's handle, and handle is driven through lock catch, trip catch and arc baffle cooperation drive moving contact and circuit breaker's static contact closing or opening. The circuit breaker includes shell and sets up in the handle of shell, moving contact, static contact, input terminal, output terminal and above-mentioned tripping mechanism, and handle is driven through tripping mechanism drive moving contact and static contact closing or opening. The tripping mechanism and circuit breaker can solve the problem that the volume of traditional circuit breaker is bigger.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switches, and in particular to a tripping mechanism and a circuit breaker. Background Art

[0002] With the rapid development of the social economy and urban construction, people's living standards and housing conditions have significantly improved, leading to a more comprehensive understanding of electricity safety. To increase electricity safety, circuit breakers are often installed in power circuits. Circuit breakers are switching devices that can close, carry, and interrupt current under normal circuit conditions, and close, carry, and interrupt current under abnormal circuit conditions within a specified timeframe. When faults such as leakage, overload, and short circuit occur in the system, circuit breakers can quickly disconnect the faulty circuit or shut off the entire power supply to prevent the fault from escalating and causing significant economic losses and casualties.

[0003] The distribution box is the last level of power distribution facilities in the power supply system, which is used to realize the distribution and protection of electric energy. It is embedded in the wall and has a small size. The traditional circuit breaker is convex in shape as a whole, and its wiring terminals usually use screw wiring. The circuit breaker itself is relatively high, and is limited by the wiring direction, so the height required for wiring installation is also very large. This type of circuit breaker using screw wiring will occupy the operating space of the operating handle of the circuit breaker. In order to ensure that the operating handle has enough space for movement, the overall size of the circuit breaker will inevitably increase. Smaller distribution boxes (for example, 86 base boxes, 118 base boxes, 120 base boxes, etc. are set as distribution boxes) have very high requirements for the miniaturization of the circuit breakers set therein. This type of circuit breaker will be difficult to meet the needs due to its own height defects. Therefore, a more miniaturized circuit breaker is needed to meet market demand. Summary of the Invention

[0004] The object of the present invention is to provide a tripping mechanism and a circuit breaker, which can solve the problem of large volume of traditional circuit breakers.

[0005] The embodiment of the present invention is achieved as follows:

[0006] One aspect of an embodiment of the present invention provides a tripping mechanism comprising a latch, a tripping member, and an arc baffle, each disposed within a circuit breaker housing. The latch, the arc baffle, and the circuit breaker's movable contact are each rotatably connected to the housing. The tripping member is rotatably connected to the movable contact, and the latch and the tripping member are disposed on the same side of the movable contact, while the arc baffle is disposed on the other side of the movable contact. The latch is configured to engage with the tripping member, which is transmission-connected to a handle of the circuit breaker. The handle is driven through the latch, the tripping member, and the arc baffle to close or open the movable contact and the static contact of the circuit breaker. This tripping mechanism can address the problem of the large size of conventional circuit breakers.

[0007] Optionally, the tripping mechanism also includes a first rotating shaft fixedly arranged in the shell, the locking member and the arc baffle are respectively rotatably connected to the shell through the first rotating shaft, an arc-shaped hole is provided on the moving contact, and the arc-shaped hole is slidably sleeved on the first rotating shaft to enable the moving contact to be rotatably connected to the shell, and a second rotating shaft is also provided on the moving contact, and the tripping member is rotatably connected to the moving contact through the second rotating shaft, and the arc-shaped hole and the second rotating shaft are concentrically arranged.

[0008] Optionally, the tripping mechanism also includes a first elastic member sleeved on the first rotating shaft, one end of the first elastic member abuts against the locking member, and the other end abuts against the arc baffle plate. The first elastic member is used to provide a reset force for the movement of the locking member relative to the arc baffle plate, and is also used to make the locking member abut against the jumping member and the arc baffle plate abut against the moving contact respectively.

[0009] 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 and the other end abuts against the housing, and the second elastic member is used to provide a reset force for the movement of the moving contact relative to the housing.

[0010] Optionally, a connecting hole is provided on the moving contact, and the connecting hole is located between the first rotating shaft and the second rotating shaft. A corresponding avoidance hole is provided on the arc baffle plate, and one end of the second elastic member passes through the avoidance hole and abuts against the connecting hole of the moving contact, so that the moving contact abuts against the first rotating shaft.

[0011] Optionally, the tripping mechanism also includes a transmission member rotatably arranged in the shell, the handle is connected to the jumper member through the transmission member, the transmission member and the jumper member are connected through a first connecting rod, and the handle is connected to the transmission member through a gear or a second connecting rod; a mounting shaft is provided on the transmission member, and the transmission member is rotatably connected to the shell through the mounting shaft, and the tripping mechanism also includes a third elastic member sleeved on the mounting shaft, one end of the third elastic member abuts against the transmission member, and the other end abuts against the shell, and the third elastic member is used to provide a reset force for the movement of the transmission member relative to the shell.

[0012] Optionally, an arc-shaped stop portion is provided on the arc baffle, and the two ends of the arc stop portion respectively correspond to the positions of the moving contact and the static contact when the circuit breaker is in the open position, and the arc stop portion is used to limit the passage of gas generated by the arc extinguishing mechanism of the circuit breaker.

[0013] Another aspect of the present invention provides a circuit breaker comprising a housing, a handle disposed within the housing, a movable contact, a stationary contact, an input terminal, an output terminal, and the aforementioned tripping mechanism, wherein the input terminal and the output terminal are respectively configured to be plugged into a distribution box, and the handle is driven by the tripping mechanism to close or open the movable contact and the stationary contact. The input terminal and the output terminal are spaced apart on the same side of the housing, and the handle is disposed on a side of the housing opposite the input terminal. When the circuit breaker is closed, the side of the handle facing away from the housing is flush with the side of the housing opposite the input terminal. This tripping mechanism can address the problem of the large size of conventional circuit breakers.

[0014] Optionally, the circuit breaker also includes an electromagnetic release, the coil of the electromagnetic release is connected to the end of the moving contact away from the static contact through a first flexible connecting wire, a first protrusion is provided on the locking piece of the tripping mechanism, and the electromagnetic release corresponds to the position of the tripping mechanism. When the current is short-circuited, the top rod of the electromagnetic release pushes the first protrusion to drive the locking piece and the tripping piece of the tripping mechanism to release, so that the moving contact and the static contact are disconnected.

[0015] Optionally, the circuit breaker further includes a thermal release located on a side of the electromagnetic release away from the handle, the fixed end of the thermal release being connected to the output terminal via a second flexible connecting wire, the movable end of the thermal release being connected to an end of the coil of the electromagnetic release away from the moving contact, a second protrusion being further provided on the locking member, the thermal release corresponding to the position of the tripping mechanism, when the current is overloaded, the movable end of the thermal release pushes the second protrusion to drive the locking member and the tripping member of the tripping mechanism to release, so as to open the moving contact and the static contact.

[0016] Optionally, the circuit breaker further includes an arc extinguishing mechanism located on a side of the thermal release away from the electromagnetic release, the arc extinguishing mechanism including a first arc striking plate and a second arc striking plate arranged opposite to each other and an arc extinguishing chamber located between the first arc striking plate and the second arc striking plate, the inlet of the arc extinguishing chamber being arranged opposite to the moving contact and the static contact, and the outlet of the arc extinguishing chamber being toward a side close to the output terminal and being electrically insulated from the output terminal.

[0017] The beneficial effects of the embodiments of the present invention include:

[0018] The tripping mechanism includes a locking member, a tripping member, and an arc-blocking plate, each of which is respectively arranged in the housing of the circuit breaker. The locking member, the arc-blocking plate, and the movable contact of the circuit breaker are respectively rotatably connected to the housing, and the tripping member is rotatably connected to the movable contact. The locking member and the tripping member are respectively arranged on the same side of the movable contact, and the arc-blocking plate is arranged on the other side of the movable contact. The locking member is used to engage with the tripping member, and the tripping member is transmission-connected to the handle of the circuit breaker. The handle is driven by the locking member, the tripping member, and the arc-blocking plate to drive the movable contact and the static contact of the circuit breaker to close or open. Among them, the locking member and the tripping member are respectively arranged on the same side of the movable contact, and the arc-blocking plate is arranged on the other side of the movable contact. This can make the specific structure and installation of the tripping mechanism simpler, thereby making the tripping mechanism occupy less space and simplifying the transmission action, which helps to achieve miniaturization of the circuit breaker and is conducive to automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A cross-sectional view of a circuit breaker provided in an embodiment of the present invention in a manually closed state;

[0021] Figure 2 A cross-sectional view of a circuit breaker provided in an embodiment of the present invention in a manually opened state;

[0022] Figure 3 A cross-sectional view of a circuit breaker provided in an embodiment of the present invention in a fault-tripped state;

[0023] Figure 4 A schematic structural diagram of a locking member and a jumper provided in an embodiment of the present invention in a fastened state;

[0024] Figure 5A schematic structural diagram of a locking member and a jumper provided in an embodiment of the present invention in an unlocked state;

[0025] Figure 6 A schematic structural diagram of an arc baffle of a tripping mechanism provided in an embodiment of the present invention;

[0026] Figure 7 One of the structural schematic diagrams of the moving contact of the circuit breaker provided by an embodiment of the present invention;

[0027] Figure 8 A second structural diagram of a moving contact of a circuit breaker provided in an embodiment of the present invention;

[0028] Figure 9 A schematic structural diagram of a circuit breaker provided in an embodiment of the present invention.

[0029] Icons: 100 - tripping mechanism; 110 - arc baffle; 111 - avoidance hole; 112 - arc-shaped stopper; 120 - lock member; 121 - first protrusion; 122 - second protrusion; 130 - jump member; 140 - first elastic member; 150 - second elastic member; 160 - transmission member; 161 - first connecting rod; 162 - gear; 170 - third elastic member; 200 - circuit breaker; 210 - housing; 211 - first rotating shaft; 212 - adjustment member; 220 - handle; 23 0-moving contact; 231-contact part; 232-welding part; 233-connecting hole; 234-mounting hole; 235-second rotating shaft; 236-arc-shaped hole; 237-limiting protrusion; 240-static contact; 250-input terminal; 260-output terminal; 270-electromagnetic release; 271-first flexible connecting wire; 280-thermal release; 281-second flexible connecting wire; 290-arc extinguishing mechanism; 291-first arc-starting plate; 292-second arc-starting plate; 293-arc extinguishing chamber. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0033] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0035] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections, indirect connections through an intermediate medium, or connections within two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] Please refer to Figures 1 to 9 The present invention provides a circuit breaker 200, comprising a housing 210, a handle 220, a movable contact 230, a stationary contact 240, an input terminal 250, an output terminal 260, and a trip mechanism 100 disposed within the housing 210. The input terminal 250 and the output terminal 260 are respectively configured to be plugged into a distribution box. The handle 220 is driven by the trip mechanism 100 to drive the movable contact 230 and the stationary contact 240 to close or open the circuit breaker. The input terminal 250 and the output terminal 260 are spaced apart and disposed on the same side of the housing 210. The handle 220 is disposed on a side of the housing 210 opposite the input terminal 250. When the circuit breaker 200 is closed, the side of the handle 220 facing away from the housing 210 is flush with the side of the housing 210 opposite the input terminal 250. The trip mechanism 100 can solve the problem of the large size of conventional circuit breakers 200.

[0037] It should be noted that if Figures 1 to 3 As shown, the housing 210 may be two sub-housings 210 disposed opposite each other. The two sub-housings 210 together enclose a space for accommodating various components, thereby improving the simplicity of the circuit breaker 200 during the manufacturing process. In order to plug the circuit breaker 200 into the distribution box, the circuit breaker 200 also includes input terminals 250 and output terminals 260 disposed within the housing 210. For example, the input terminals 250 and the output terminals 260 may be pluggable terminals, so that the input terminals 250 can be plugged into the input terminal block within the distribution box, and the output terminals 260 can be plugged into the output terminal block within the distribution box, thereby connecting the circuit breaker 200 to a power circuit with a load.

[0038] In order to realize the breaking function of the circuit breaker 200, as Figures 1 to 3 As shown, the circuit breaker 200 further includes a handle 220, a movable contact 230, a stationary contact 240, and a trip mechanism 100 disposed within the housing 210. 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 transmission-connected to the movable contact 230 via the trip mechanism 100. The stationary contact 240 is fixedly connected to the housing 210. The movable contact 230 is connected to the output terminal 260, and the stationary contact 240 is connected to the input terminal 250. When driven by an external force, the handle 220 can drive the trip mechanism 100 to move, thereby driving the movable contact 230 toward or away from the stationary contact 240, thereby closing or opening the circuit breaker 200. The handle 220 is transmission-connected to the movable contact 230 via the trip mechanism 100, and a transmission relationship can be established at all times or only when needed.

[0039] Specifically, if Figure 1 and Figure 2 As shown, when the moving contact 230 moves toward the side close to the static contact 240 so that the moving contact 230 comes into contact with the static contact 240, the circuit breaker 200 can be closed. At this time, the conductive circuit formed by the input terminal block, the input terminal 250, the static contact 240, the moving contact 230, the output terminal 260 and the output terminal block can be turned on; when the moving contact 230 moves toward the side away from the static contact 240 so that the moving contact 230 is out of contact with the static contact 240, the circuit breaker 200 can be opened. At this time, the conductive circuit formed by the input terminal block, the input terminal 250, the static contact 240, the moving contact 230, the output terminal 260 and the output terminal block can be turned off, thereby realizing the switching of the on state and the off state of the load through the circuit breaker 200.

[0040] In addition, the input terminal 250 and the output terminal 260 are respectively arranged at intervals on the same side of the housing 210 (eg Figures 1 to 3As shown, the input terminals 250 and the output terminals 260 are respectively disposed below the housing 210, thereby achieving the same-side input and same-side output function. This simplified description is based on the conduction direction of the load circuit (or, in other words, the side of the housing 210 where the input terminals 250 and the output terminals 260 are disposed is regarded as the rear end), thus forming a back-in, back-out wiring configuration, thereby improving the convenience of wiring when the circuit breaker 200 is plugged into the distribution box. In addition, the input terminals 250 and the output terminals 260 are arranged in a spaced-apart manner, which can increase the spacing between the incoming and outgoing lines and prevent interference between the two lines.

[0041] At the same time, if Figure 1 and Figure 2 As shown, the handle 220 is disposed on the side of the housing 210 opposite the input terminal 250. When the circuit breaker 200 is in the manual closing state, the side of the handle 220 facing away from the housing 210 is flush with the side of the housing 210 facing the input terminal 250. When the circuit breaker 200 is in the manual opening state, the side of the handle 220 facing away from the housing 210 and the side of the housing 210 facing the input terminal 250 form an angle. While ensuring that the handle 220 can drive the movable contact 230 and the static contact 240 to close or open the circuit breaker via the trip mechanism 100, the smaller the angle, the smaller the operating space of the handle 220, thereby reducing the size of the circuit breaker 200. For example, the angle can be less than 30°.

[0042] like Figure 4 and Figure 5 As shown, the tripping mechanism 100 includes a lock member 120, a trip member 130 and an arc baffle 110 respectively arranged in the housing 210 of the circuit breaker 200. The lock member 120, the arc baffle 110 and the moving contact 230 of the circuit breaker 200 are respectively rotatably connected to the housing 210, the trip member 130 is rotatably connected to the moving contact 230, and the lock member 120 and the trip member 130 are respectively arranged on the same side of the moving contact 230, and the arc baffle 110 is arranged on the other side of the moving contact 230; the lock member 120 is used to engage with the trip member 130, and the trip member 130 is transmission-connected to the handle 220 of the circuit breaker 200. The handle 220 is driven by the lock member 120, the trip member 130 and the arc baffle 110 to drive the moving contact 230 and the static contact 240 of the circuit breaker 200 to close or open. Among them, the locking member 120 and the jumping member 130 are respectively arranged on the same side of the moving contact 230, and the arc baffle 110 is arranged on the other side of the moving contact 230, which can make the specific structure and installation coordination of the tripping mechanism 100 simpler, thereby making the tripping mechanism 100 occupy smaller space and the transmission action simpler, which helps to realize the miniaturization of the circuit breaker 200 and is conducive to the realization of automated production.

[0043] Specifically, if Figures 4 to 8 As shown, the tripping mechanism 100 also includes a first rotating shaft 211 fixedly arranged in the shell 210, and the locking member 120 and the arc baffle 110 are respectively rotatably connected to the shell 210 through the first rotating shaft 211. An arc hole 236 is provided on the moving contact 230, and the arc hole 236 is slidably sleeved on the first rotating shaft 211 to enable the moving contact 230 to be rotatably connected to the shell 210. A second rotating shaft 235 is also provided on the moving contact 230, and the tripping member 130 is rotatably connected to the moving contact 230 through the second rotating shaft 235. The arc hole 236 and the second rotating shaft 235 are concentrically arranged so that the distance between the first rotating shaft 211 and the second rotating shaft 235 remains unchanged, or in other words, the projection of the arc hole 236 on the moving contact 230 falls on a circular trajectory with the second rotating shaft 235 as the center and the distance between the first rotating shaft 211 and the second rotating shaft 235 as the radius. During installation, the first rotating shaft 211 can be assembled on the housing 210, and then the arc baffle 110 can be mounted on the first rotating shaft 211. The movable contact 230 can then be connected to the first rotating shaft 211 through the arc-shaped hole 236. Finally, the locking member 120 can be mounted on the first rotating shaft 211, and the jumper 130 can be mounted on the second rotating shaft 235. The second rotating shaft 235 can be a rivet post, rivet, or other existing products to facilitate fixing the second rotating shaft 235 to the movable contact 230.

[0044] The height of the first rotating shaft 211 needs to be greater than the sum of the thicknesses of the locking member 120, the arc baffle 110, and the movable contact 230. This allows the locking member 120 and the movable contact 230 to be mounted on the first rotating shaft 211 after the arc baffle 110 is mounted on the first rotating shaft 211. Furthermore, a certain gap is maintained between the locking member 120 and the adjacent housing 210 to prevent the housing 210 from interfering with the relative movement of the locking member 120, the tripping member 130, and the arc baffle 110. Similarly, the height of the second rotating shaft 235 needs to be greater than the thickness of the tripping member 130 to allow the tripping member 130 to be mounted on the second rotating shaft 235. Furthermore, a certain gap is maintained between the tripping member 130 and the adjacent housing 210 to prevent the housing 210 from interfering with the relative movement of the tripping member 130, the locking member 120, and the arc baffle 110.

[0045] In order to enable the locking member 120 to restore its original state during the closing and opening process of the moving contact 230 and the static contact 240, Figure 4 and Figure 5As shown, in this embodiment, the tripping mechanism 100 also includes a first elastic member 140 sleeved on the first rotating shaft 211, one end of the first elastic member 140 is abutted against the locking member 120, and the other end is abutted against the arc baffle 110, and the first elastic member 140 is used to provide a reset force for the movement of the locking member 120 relative to the arc baffle 110. In addition, the first elastic member 140 is also used to make the locking member 120 and the tripping member 130 and the arc baffle 110 and the moving contact 230 respectively abut, so that the locking member 120, the tripping member 130, the arc baffle 110 and the moving contact 230 can form a whole, so as to be closed under the drive of the handle 220.

[0046] In order to enable the above-mentioned moving contact 230 to restore its own initial state during the closing and opening process of the moving contact 230 and the static contact 240, in this embodiment, as shown in FIG. Figure 4 and Figure 5 As shown, the tripping mechanism 100 also includes a second elastic member 150 sleeved on the first rotating shaft 211, one end of the second elastic member 150 abuts against the moving contact 230, and the other end abuts against the shell 210. The second elastic member 150 is used to provide a reset force for the movement of the moving contact 230 relative to the shell 210.

[0047] In this embodiment, if Figures 4 to 8 As shown, the movable contact 230 is provided with a connection hole 233, which is located between the first rotating shaft 211 and the second rotating shaft 235. The arc baffle 110 is correspondingly provided with an avoidance hole 111. One end of the second elastic member 150 passes through the avoidance hole 111 and abuts against the connection hole 233 of the movable contact 230, so that the movable contact 230 abuts against the first rotating shaft 211. In this way, the second elastic member 150 can cause the end of the movable contact 230 away from the static contact 240 (or, in other words, the end of the movable contact 230 closer to the first rotating shaft 211) to abut against the first rotating shaft 211, thereby providing the movable contact 230 with contact pressure during closing and reset force during opening via the second elastic member 150.

[0048] Alternatively, as Figures 1 to 3 As shown, the trip mechanism 100 further includes a transmission member 160 rotatably disposed within the housing 210. The handle 220 is connected to the tripping member 130 via the transmission member 160. The transmission member 160 and the tripping member 130 are connected via a first connecting rod 161. The handle 220 and the transmission member 160 are connected via a gear 162 or a second connecting rod. For example, in this embodiment, the handle 220 is provided with a toothed portion, and the transmission member 160 is correspondingly provided with a gear 162. The toothed portion and the gear 162 engage with each other, thereby establishing a transmission connection between the handle 220 and the transmission member 160. Compared to a connecting rod transmission method, a transmission method using gears 162 can save more space.

[0049] In order to enable the transmission member 160 to restore its original state during the closing and opening process of the moving contact 230 and the static contact 240, in this embodiment, Figures 1 to 3 As shown, a mounting shaft is provided on the transmission member 160, and the transmission member 160 is rotatably connected to the shell 210 through the mounting shaft. The tripping mechanism 100 also 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, and the other end abuts against the shell 210. The third elastic member 170 is used to provide a reset force for the movement of the transmission member 160 relative to the shell 210.

[0050] In this embodiment, if Figures 1 to 3 As shown, the circuit breaker 200 also includes an electromagnetic release 270. The coil of the electromagnetic release 270 is connected to the end of the moving contact 230 away from the static contact 240 through a first flexible connecting line 271. A first protrusion 121 is provided on the locking member 120 of the tripping mechanism 100. The electromagnetic release 270 corresponds to the position of the tripping mechanism 100. When the current is short-circuited, the top rod of the electromagnetic release 270 pushes the first protrusion 121 to drive the locking member 120 and the tripping member 130 of the tripping mechanism 100 to unlock, so that the moving contact 230 and the static contact 240 are disconnected.

[0051] In this embodiment, if Figures 1 to 3 As shown, the circuit breaker 200 also includes a thermal release 280 located on the side of the electromagnetic release 270 away from the handle 220. The fixed end of the thermal release 280 is connected to the output terminal 260 via a second flexible connecting wire 281. The movable end of the thermal release 280 is connected to the end of the coil of the electromagnetic release 270 away from the moving contact 230. A second protrusion 122 is also provided on the locking member 120. The position of the thermal release 280 corresponds to that of the tripping mechanism 100. When the current is overloaded, the movable end of the thermal release 280 pushes the second protrusion 122 to drive the locking member 120 to release the tripping member 130 of the tripping mechanism 100, so as to open the moving contact 230 and the static contact 240. Among them, the thermal release 280 can be a bimetallic strip, for example, made of a material with a thermal expansion coefficient. In this way, when the temperature rises, the bimetallic strip will expand and deform due to the heat, thereby driving the moving contact 230 to move toward the side away from the static contact 240 to enable the circuit breaker 200 to be opened.

[0052] It is worth noting that since the coil of the electromagnetic release 270 is connected to the end of the moving contact 230 away from the static contact 240 through the first flexible connecting wire 271, when the internal layout of the circuit breaker 200 is performed, it is only necessary to make the electromagnetic release 270 and the moving contact 230 as close as possible to facilitate the wiring of the first flexible connecting wire 271. The position of the electromagnetic release 270 corresponds to that of the tripping mechanism 100, so it is necessary to ensure that when the current is short-circuited, the top rod of the electromagnetic release 270 can drive the locking member 120 and the tripping member 130 of the tripping mechanism 100 to unlock by pushing the first protrusion 121.

[0053] Similarly, since the fixed end of the thermal release 280 is connected to the output terminal 260 via the second flexible connecting wire 281, when the internal layout of the circuit breaker 200 is performed, it is only necessary to place the thermal release 280 and the output terminal 260 as close as possible to facilitate the wiring of the second flexible connecting wire 281. The thermal release 280 corresponds to the position of the trip mechanism 100, so it is necessary to ensure that when the current is overloaded, the movable end of the thermal release 280 can drive the locking member 120 to disengage the tripping member 130 of the trip mechanism 100 by pushing the second protrusion 122. For example, in this embodiment, the extension direction of the top rod of the electromagnetic release 270 is parallel to the extension direction of the thermal release 280 before deformation due to heat, 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.

[0054] In this embodiment, if Figure 7 and Figure 8 As shown, the movable contact 230 includes a contact portion 231 and a welding portion 232. The contact portion 231 is used to contact or separate from the static contact 240, thereby closing or opening the circuit breaker 200. At the same time, the movable contact 230 is electrically connected to the electromagnetic release 270 through the welding portion 232. Furthermore, the movable contact 230 is provided with a mounting hole 234 and a connecting hole 233. A second rotating shaft 235 is assembled in the mounting hole 234, so that the tripping member 130 is rotatably connected to the movable contact 230 via the second rotating shaft 235. One end of the second elastic member 150 passes through the avoidance hole 111 on the arc baffle 110 and is connected to the connecting hole 233 of the movable contact 230, so that the movable contact 230 abuts against the first rotating shaft 211.

[0055] In addition, if Figure 7As shown, in this embodiment, a limiting protrusion 237 is further provided on the moving contact 230 near the welding portion 232 (or the side away from the contact portion 231 / static contact 240). Since the moving contact 230 and the locking member 120 are located on the same side of the arc baffle 110, the moving contact 230 and the locking member 120 may interfere with their respective movements. Based on the aforementioned 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 moving contact 230, in order to further prevent the moving contact 230 from pushing the locking member 120 to move toward the side close to the adjacent shell 210, the limiting protrusion 237 is also used here to ensure that the moving contact 230 is always close to the surface of the arc baffle 110 toward the side close to the arc baffle 110, thereby ensuring that there is a certain gap between the locking member 120 and the adjacent shell 210, thereby ensuring that the movement of the locking member 120 is smoother and will not be blocked.

[0056] Here, the transmission action of the tripping mechanism 100 is explained with the circuit breaker 200 being in the open state as the initial state. When the circuit breaker 200 is to be closed, the locking member 120 and the tripping member 130 are engaged with each other (e.g., Figure 4 As shown), therefore, the lock catch 120 and the jump catch 130, the lock catch 120 and the arc baffle 110, and the jump catch 130 and the arc baffle 110 are all fixed, and because the end of the moving contact 230 away from the static contact 240 (or the end of the moving contact 230 close to the first rotating shaft 211) is in contact with the first rotating shaft 211, the moving contact 230 and the arc baffle 110 are also fixed. In other words, at this time, the lock catch 120, the jump catch 130, the arc baffle 110 and the moving contact 230 are fixed. 0 form an integral body, so that when the handle 220 is driven by an external force, the lock member 120, the trip member 130 and the arc baffle 110 can cooperate to drive the moving contact 230 toward the side close to the static contact 240; when the circuit breaker 200 encounters a fault and needs to be opened, the thermal release 280 or the electromagnetic release 270 will correspondingly push the first protrusion 121 or the second protrusion 122 on the lock member 120, so that the lock member 120 rotates relative to the arc baffle 110, driving the lock member 120 and the trip member 130 to release the engagement (such as Figure 5 As shown), the locking member 120, the jumping member 130, the arc baffle 110 and the moving contact 230 are separated from each other, and the locking member 120 is reset relative to the arc baffle 110 under the action of the first elastic member 140, the moving contact 230 is reset relative to the housing 210 under the action of the second elastic member 150, and the transmission member 160 drives the jumping member 130 to reset relative to the housing 210 under the action of the third elastic member 170, so that the arc baffle 110 is reset relative to the housing 210 under the joint action of the locking member 120, the moving contact 230 and the jumping member 130.

[0057] In this embodiment, if Figures 1 to 3 As shown, the circuit breaker 200 also includes an arc extinguishing mechanism 290 located on the side of the thermal release 280 away from the electromagnetic release 270. The arc extinguishing mechanism 290 includes a first arc-strike plate 291 and a second arc-strike plate 292 arranged opposite to each other and an arc-strike chamber 293 located between the first arc-strike plate 291 and the second arc-strike plate 292. The entrance of the arc-strike chamber 293 is arranged opposite to the moving contact 230 and the static contact 240, and the outlet of the arc-strike chamber 293 is toward the side close to the output terminal 260 and is electrically insulated from the output terminal 260.

[0058] It should be noted that when the internal layout of the circuit breaker 200 is carried out, since the arc generated between the moving contact 230 and the static contact 240 when the circuit breaker is opened needs to be introduced into the arc extinguishing mechanism 290 for arc extinguishing, the arc extinguishing mechanism 290 includes a first arc-striking plate 291 and a second arc-striking plate 292 arranged opposite to each other and an arc-striking chamber 293 located between the first arc-striking plate 291 and the second arc-striking plate 292. The inlet of the arc-striking chamber 293 is arranged opposite to the moving contact 230 and the static contact 240, and the outlet of the arc-striking chamber 293 is toward the side close to the output terminal 260 and is electrically insulated from the output terminal 260. In this way, during the opening process of the circuit breaker 200, the arc generated between the moving contact 230 and the static contact 240 can be guided into the arc extinguishing chamber 293 through the entrance of the arc extinguishing chamber 293 by the cooperation of the first arc-striking plate 291 and the second arc-striking plate 292 for rapid extinguishing. The gas generated after the arc extinguishing can be discharged to the outside of the shell 210 through the outlet of the arc extinguishing chamber 293, thereby reducing the electrical loss caused by the arc to the circuit breaker 200. At the same time, it can also avoid the gas generated after the arc extinguishing from causing electrical interference to the output terminal 260 arranged adjacent to the arc extinguishing chamber 293, thereby improving the service life of the circuit breaker 200.

[0059] like Figure 1 and Figure 2 As shown, during the closing or opening process of the circuit breaker 200, the arc generated between the movable contact 230 and the static contact 240 at the front end can enter the arc extinguishing chamber 293 at the rear end through the entrance of the arc extinguishing chamber 293 for arc extinguishing. The high-pressure gas generated after the arc is extinguished can enter the exhaust duct located at the further rear end through the outlet of the arc extinguishing chamber 293 for cooling, and finally be discharged to the outside of the circuit breaker 200. However, since a certain movement space needs to be reserved between the movable contact 230 and the static contact 240 to facilitate the movement of the movable contact 230 toward or away from the static contact 240, and the air pressure in this movement space is similar to the air pressure between the first arc-strike plate 291 and the second arc-strike plate 292, the high-pressure gas generated by the arc may flow toward the movement space and cause backflow, thereby affecting the arc extinguishing capability and arc extinguishing effect of the circuit breaker 200.

[0060] In order to solve the above problems, Figures 1 to 6 As shown, in this embodiment, an arc-shaped stopper 112 is provided on the arc baffle 110, and the two ends of the arc-shaped stopper 112 respectively correspond to the positions of the moving contact 230 and the static contact 240 when the circuit breaker 200 is in the open position. The arc-shaped stopper 112 is used to limit 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 closed, since the locking member 120, the tripping member 130, the arc baffle 110 and the moving contact 230 form a whole, the arc-shaped stop portion 112 on the arc baffle 110 can move synchronously with the movement of the moving contact 230 toward the side close to the static contact 240 until the moving contact 230 contacts the static contact 240; when the circuit breaker 200 is to be opened, since the locking member 120, the tripping member 130, the arc baffle 110 and the moving contact 230 are separated from each other, the arc-shaped stop portion 112 on the arc baffle 110 can be reset relative to the housing 210 under the joint action of the locking member 120, the moving contact 230 and the tripping member 130.

[0061] Because the movable contact 230 rotates relative to the stationary contact 240, its motion trajectory is arc-shaped. Therefore, the arc-shaped stopper 112 rotates relative to the stationary contact 240, and its motion trajectory is also arc-shaped. The geometric center of the motion trajectory of the arc-shaped stopper 112 is the rotation center of the arc baffle 110 relative to the housing 210. On this basis, to ensure the feasibility of the movement of the arc-shaped stopper 112 relative to the stationary contact 240, the cross-sectional shape of the arc-shaped stopper 112 is also arc-shaped. When the moving contact 230 rotates toward the side close to the static contact 240, the distance between the moving contact 230 and the static contact 240 gradually decreases. When the moving contact 230 rotates toward the side away from the static contact 240, the distance between the moving contact 230 and the static contact 240 gradually increases. In order to make the distance between the moving contact 230 and the static contact 240 reach the minimum and maximum, the arc-shaped stop portion 112 can block the gap between the moving contact 230 and the static contact 240. Therefore, the two ends of the arc-shaped stop portion 112 correspond to the positions of the moving contact 230 and the static contact 240 when the circuit breaker 200 is in the open position.

[0062] Alternatively, as Figures 1 to 3 As shown, an adjusting member 212 is provided on the housing 210. The end of the adjusting member 212 abuts against the first arc-starting plate 291 and is used to adjust the distance between the movable end of the thermal release 280 and the trip mechanism 100, thereby adjusting the overload protection operating current of the circuit breaker 200. The adjusting member 212 can be an adjusting screw that adjusts the distance between the movable end of the thermal release 280 and the trip mechanism 100 by screwing.

[0063] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A tripping mechanism (100), characterized in that: The invention comprises a locking member (120), a jumper (130) and an arc baffle (110) respectively arranged in a housing (210) of a circuit breaker (200); the locking member (120), the arc baffle (110) and the movable contact (230) of the circuit breaker (200) are respectively rotatably connected to the housing (210); the jumper (130) is rotatably connected to the movable contact (230); the locking member (120) and the jumper (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 member (120) is used to be engaged with the tripping member (130), and the tripping member (130) is transmission-connected to the handle (220) of the circuit breaker (200). The handle (220) is driven by the locking member (120), the tripping member (130) and the arc baffle (110) to drive the moving contact (230) and the static contact (240) of the circuit breaker (200) to close or open. The arc baffle (110) is provided with an arc-shaped stopper (112), and the two ends of the arc-shaped stopper (112) respectively correspond to the positions of the moving contact (230) and the static contact (240) when the circuit breaker (200) is in the open position. The arc-shaped stopper (112) is used to limit the passage of gas generated by the arc extinguishing mechanism (290) of the circuit breaker (200).

2. The tripping mechanism (100) according to claim 1, characterized in that: The tripping mechanism (100) further includes a first rotating shaft (211) fixedly arranged in the housing (210); the locking member (120) and the arc baffle (110) are respectively rotatably connected to the housing (210) via the first rotating shaft (211); an arc-shaped hole (236) is provided on the moving contact (230); the arc-shaped hole (236) is slidably sleeved on the first rotating shaft (211) so that the moving contact (230) is rotatably connected to the housing (210); a second rotating shaft (235) is further provided on the moving contact (230); the tripping member (130) is rotatably connected to the moving contact (230) via the second rotating shaft (235); the arc-shaped hole (236) and the second rotating shaft (235) are concentrically arranged.

3. The tripping mechanism (100) according to claim 2, characterized in that: The tripping mechanism (100) further comprises a first elastic member (140) sleeved on the first rotating shaft (211), one end of the first elastic member (140) being in contact with the locking member (120) and the other end being in contact with the arc baffle (110), the first elastic member (140) being used to provide a reset force for the movement of the locking member (120) relative to the arc baffle (110), and also being used to respectively cause the locking member (120) to be in contact with the tripping member (130) and the arc baffle (110) to be in contact with the moving contact (230).

4. The tripping mechanism (100) according to claim 2, characterized in that: The tripping mechanism (100) further comprises a second elastic member (150) sleeved on the first rotating shaft (211), one end of the second elastic member (150) abutting against the moving contact (230) and the other end abutting against the housing (210), and the second elastic member (150) is used to provide a reset force for the movement of the moving contact (230) relative to the housing (210).

5. The tripping mechanism (100) according to claim 4, characterized in that: A connecting hole (233) is provided on the movable contact (230), and the connecting hole (233) is located between the first rotating shaft (211) and the second rotating shaft (235). A corresponding avoidance hole (111) is provided on the arc baffle (110). One end of the second elastic member (150) passes through the avoidance 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 tripping mechanism (100) according to claim 1, characterized in that: The tripping mechanism (100) further comprises a transmission member (160) rotatably disposed within the housing (210); the handle (220) is transmission-connected to the tripping member (130) via the transmission member (160); the transmission member (160) and the tripping member (130) are connected via a first connecting rod (161); and the handle (220) and the transmission member (160) are connected via a gear (162) or a second connecting rod. The transmission member (160) is provided with a mounting shaft, and the transmission member (160) is rotatably connected to the housing (210) via the mounting shaft. The tripping 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) and the other end abuts against the housing (210). The third elastic member (170) is used to provide a reset force for the movement of the transmission member (160) relative to the housing (210).

7. A circuit breaker (200), characterized in that: The invention comprises a housing (210), a handle (220), a moving contact (230), a static contact (240), an input terminal (250), an output terminal (260) and a tripping mechanism (100) as claimed in any one of claims 1 to 6, wherein the input terminal (250) and the output terminal (260) are respectively used for plugging into a distribution box, and the handle (220) is driven by the tripping mechanism (100) to drive the moving contact (230) and the static contact (240) to close or open the circuit breaker; The input terminal (250) and the output terminal (260) are arranged at intervals on the same side of the housing (210), and the handle (220) is arranged on a side of the housing (210) opposite to the input terminal (250). When the circuit breaker (200) is in a closed state, 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).

8. The circuit breaker (200) according to claim 7, characterized in that The circuit breaker (200) further comprises an electromagnetic release (270), wherein the coil of the electromagnetic release (270) is connected to an end of the moving contact (230) away from the static contact (240) via a first flexible connecting wire (271), a first protrusion (121) is provided on the locking member (120) of the tripping mechanism (100), and the electromagnetic release (270) corresponds to the position of the tripping mechanism (100). When the current is short-circuited, the top rod of the electromagnetic release (270) pushes the first protrusion (121) to drive the locking member (120) and the tripping member (130) of the tripping mechanism (100) to be unlocked, so that the moving contact (230) and the static contact (240) are disconnected.

9. The circuit breaker (200) according to claim 8, characterized in that The circuit breaker (200) further comprises a thermal release (280) located on a side of the electromagnetic release (270) away from the handle (220), wherein a fixed end of the thermal release (280) is connected to the output terminal (260) via a second flexible connecting wire (281), and a movable end of the thermal release (280) is connected to an end of the coil of the electromagnetic release (270) away from the moving contact (230), and a second protrusion (122) is further provided on the locking member (120), wherein the thermal release (280) corresponds to the position of the tripping mechanism (100), and when the current is overloaded, the movable end of the thermal release (280) pushes the second protrusion (122) to drive the locking member (120) and the tripping member (130) of the tripping mechanism (100) to be unlocked, so that the moving contact (230) and the static contact (240) are disconnected.

10. The circuit breaker (200) according to claim 9, characterized in that The circuit breaker (200) further comprises an arc extinguishing mechanism (290) located on a side of the thermal release (280) away from the electromagnetic release (270), the arc extinguishing mechanism (290) comprising a first arc striking plate (291) and a second arc striking plate (292) arranged 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) being arranged opposite to the moving contact (230) and the static contact (240), and an outlet of the arc extinguishing chamber (293) facing a side close to the output terminal (260) and being electrically insulated from the output terminal (260).

Images