A low voltage circuit breaker

Abstract

The present invention belongs to the technical field of low-voltage electrical appliances, and specifically relates to a circuit breaker, comprising an insulating housing (100) and an operating mechanism (200) arranged in the insulating housing (100), a contact system (300), an arc extinguishing system (400), an overcurrent protection system (500), an outlet terminal (600) and an inlet terminal (700), characterized in that an arc channel (800) is arranged at the bottom of the insulating housing (100). The arc extinguishing chamber of the present invention is arranged below, and the arc is ejected from the arc channel at the bottom, eliminating the setting of the arc ejection port at the inlet terminal, and the safety distance can be reduced to zero, which can reduce the space of the switch cabinet, and at the same time shorten the length of the connecting plate and busbar connected to the circuit breaker, thereby reducing the copper consumption of the switch cabinet and reducing the cost.

Description

Technical Field

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

[0002] like Figure 1 As shown, it is a schematic diagram of the internal structure of a molded case circuit breaker of the prior art. In the low-voltage circuit breaker of the prior art, the arc extinguishing chamber 4 is vertically arranged between the moving contact 5 and the static contact 1 along the height direction of the low-voltage circuit breaker 10, i.e., the Y' axis direction. The operating mechanism 6 is arranged at the upper right of the moving contact 5 along the height direction of the low-voltage circuit breaker, i.e., the Y' axis direction. The arc spraying port 3 is arranged on the side of the arc extinguishing chamber 4 away from the moving contact 5 along the length direction of the circuit breaker 10, i.e., the X' axis direction. When the moving contact 5 and the static contact 1 are disconnected, such as when the circuit breaker breaks the fault current, an arc is generated between the moving contact 5 and the static contact 1, so that the surrounding air is ionized to form a high-temperature and high-pressure conductive free gas. The residual gas after cooling and cutting in the arc extinguishing chamber 4 is sprayed out of the outside of the circuit breaker through the arc spraying port 3. The circuit breaker of the prior art is electrically connected to the wiring screw 2 of the incoming line end at one end of the static contact 1, and the wiring screw 2 is directly opposite to the position of the arc spraying port 3. When a line fault occurs and the fault current is interrupted, the arc will be led along the arc-striking piece of the arc-extinguishing chamber 4 to the wiring screw 2 at the incoming line end, causing a direct short circuit between the wiring screw 2 and the moving contact 5, thereby causing a disconnection failure.

[0003] In addition, if Figure 2 and Figure 3 As shown in FIG. 1 , it is a schematic diagram of the installation of a circuit breaker 10 in the switch cabinet of the prior art. The incoming line end of the circuit breaker 10 is arranged parallel to the metal plate 7. The arc spraying port 3 in the circuit breaker 10 is arranged along the length direction as shown in FIG. Figure 1 The X'-axis direction shown is arranged on the side of the arc extinguishing chamber 4 away from the moving contact 5. When the circuit breaker 10 is disconnected, high-temperature and high-pressure conductive free gas is ejected from the arc nozzle 3. To ensure safety, the distance L1 between the incoming line end of the circuit breaker 10 and the busbar 8, the distance L2 between the side of the circuit breaker 10, i.e., the side close to the metal plate 7 along the width direction, i.e., the Z'-axis direction, and the metal plate 7 of the switch cabinet, and the distance L3 between two adjacent circuit breakers 10 need to meet a certain safety distance. Therefore, a large amount of space in the switch cabinet is occupied, and the space utilization rate is low.

[0004] Figure 4The figure is a schematic diagram of the installation of a drawer unit 11 of a circuit breaker 10' in a drawer cabinet of the prior art. In the figure, the X'' axis direction is the length direction of the circuit breaker 10', and the Z'' axis direction is the width direction of the circuit breaker 10'. When the circuit breaker 10' is disconnected, high-temperature and high-pressure conductive free gas is ejected from the arc nozzle 3. The difference from the installation in the switch cabinet is that the circuit breaker 10' installed in the drawer cabinet is horizontally installed, and the circuit breaker 10' and the metal plate of the drawer unit 11 are vertically arranged. To ensure safety, the distance between the incoming line end of the circuit breaker 10' and the metal plate of the drawer unit 11 along its length direction, that is, the X'' axis direction, must meet a certain safety distance L4, resulting in the space of the drawer unit 11 being occupied and the space utilization rate being low. When the circuit breaker 10' is disconnected, high-temperature and high-pressure conductive free gas is ejected from the arc outlet 3, which can easily cause a short circuit between the connecting plates of the drawer unit 11 or between the metal plates of the drawer unit 11, causing a secondary fault of "fire burning the camp" and leading to a serious accident of burning the entire drawer cabinet.

[0005] Figure 5 The figure is a schematic diagram of the installation of a circuit breaker 10'' in a DC system junction box 12 according to the prior art. In the figure, the X''' axis direction is the length direction of the circuit breaker 10'', and the Z''' axis direction is the width direction of the circuit breaker 10''. Similarly, when the circuit breaker 10'' is disconnected, high-temperature and high-pressure conductive free gas is ejected from the arc nozzle 3. To ensure safety, a certain safety distance L5 must be maintained between the incoming line end of the circuit breaker 10'' and the metal plate of the junction box 12, a safety distance L6 must be maintained between the arc nozzle 3 of the next row of circuit breakers 10'' and the outgoing line end of the upper row of circuit breakers 10'', and a certain safety distance L7 must be maintained between the arc nozzle 3 of the circuit breaker 10'' and the bus in the junction box 12, resulting in the space of the junction box 12 being occupied and the space utilization rate being low. When the circuit breaker 10'' is disconnected, high-temperature and high-pressure conductive free gas is ejected from the arc nozzle 3, which can easily cause a short circuit between the busbars in front of the circuit breaker or between the busbars and the metal plate of the combiner box, causing a secondary fault of "burning the entire camp", leading to a serious accident of burning the entire combiner box 12.

[0006] Finally, the circuit breaker 10 of the prior art is usually used at a relatively high working voltage (such as AC800V, DC1500V). In order to increase the arcing voltage during fault interruption, the number of arc extinguishing grids needs to be increased. This will increase the height of the arc extinguishing chamber while keeping the grid spacing unchanged, thereby increasing the height of the overall product and further occupying space in the switch cabinet. Summary of the invention

[0007] Based on the above background, in order to solve at least one of the above problems, the purpose of the present invention is to provide a low-voltage circuit breaker, which can change the direction of the arc, achieve zero arcing, and can reduce the space of the switch cabinet, shorten the length of the connecting plate and the busbar connected to the circuit breaker, reduce the copper usage of the switch cabinet, and reduce the cost. At the same time, it solves the problems of breakdown of the busbar and the ground due to arcing during the use of the circuit breaker.

[0008] The technical solution of the present invention is as follows:

[0009] A circuit breaker comprises an insulating shell and an operating mechanism, a contact system, an arc extinguishing system, an overcurrent protection system, an outlet terminal and an inlet terminal arranged in the insulating shell. An arc channel is arranged at the bottom of the insulating shell.

[0010] Preferably, the length of the arc channel is not less than the length of the arc extinguishing system.

[0011] Preferably, the arc extinguishing system is arranged adjacent to the arc channel along the height direction of the circuit breaker and is arranged on a side close to the top of the circuit breaker.

[0012] Preferably, the contact system comprises a moving contact and a stationary contact, and the stationary contact is a fixed stationary contact or a repulsive rotational stationary contact.

[0013] Preferably, the moving contact and the static contact are respectively arranged adjacent to the arc extinguishing system along the height direction of the circuit breaker and are arranged on one side close to the top of the circuit breaker.

[0014] Preferably, the operating mechanism is arranged adjacent to the moving contact along the height direction of the circuit breaker and is arranged on a side close to the top of the circuit breaker.

[0015] Preferably, the arc channel is extended in the length direction of the circuit breaker.

[0016] Preferably, a partition is provided between the arc extinguishing system and the bottom of the insulating housing.

[0017] Preferably, the arc channel is provided with a first air outlet, which is arranged adjacent to the outlet or inlet terminal along the height direction of the circuit breaker and is arranged on a side of the outlet or inlet terminal close to the bottom of the circuit breaker.

[0018] Preferably, the arc channel is provided with a second gas outlet, and the second gas outlet is arranged adjacent to the outlet terminal along the height direction of the circuit breaker and is arranged on a side of the outlet terminal close to the bottom of the circuit breaker.

[0019] Preferably, the arc channel is provided with a third air outlet, and the third air outlet is arranged on a side of the arc extinguishing system close to the outlet terminal along the length direction of the circuit breaker.

[0020] Preferably, the arc channel is provided between the bottom of the arc extinguishing system and the second gas outlet and / or between the second gas outlet and the third gas outlet.

[0021] Preferably, the arc channel is provided with a second air outlet, which is arranged opposite to the first air outlet along the length direction of the circuit breaker and is arranged on one side of the outlet or inlet end close to the bottom of the circuit breaker along the length direction of the circuit breaker.

[0022] Preferably, the contact system comprises a moving contact and a stationary contact, and the second air outlet is arranged along the length direction of the circuit breaker at a side away from the moving contact when the moving contact is opened.

[0023] Preferably, the first air outlet and / or the second air outlet is provided with an elimination device.

[0024] Preferably, the anti-loosening device is arranged adjacent to the outlet terminal or the inlet terminal along the height direction of the circuit breaker and is arranged on a side of the outlet terminal or the inlet terminal close to the bottom of the circuit breaker.

[0025] Preferably, the operating mechanism, the contact system, the arc extinguishing system and the arc channel are arranged in sequence along the height direction of the circuit breaker.

[0026] Preferably, a line connecting the ends of the moving contact in the closed state and the open state is substantially parallel to the bottom surface of the circuit breaker, and both ends of the line point to the outgoing terminal and the incoming terminal respectively.

[0027] Preferably, the static contact is a repulsive rotation type static contact, and a line connecting the ends of the static contact in the closed state and the open state is substantially parallel to the bottom surface of the circuit breaker, and both ends of the line point to the outgoing terminal and the incoming terminal respectively.

[0028] Preferably, a cavity is provided on one side of the operating mechanism close to the line inlet end, and an electronic controller is provided in the cavity.

[0029] Preferably, the number of the arc channels is at least one.

[0030] Preferably, the static contact is arranged on one side of the incoming line end or the outgoing line end.

[0031] Preferably, the moving contact contacts or disconnects with a stationary contact provided on one side of the incoming line end or on one side of the outgoing line end.

[0032] Preferably, the operating mechanism comprises a lower connecting rod and a rotating shaft, and a hinge point between the lower connecting rod and the rotating shaft is arranged on the left side or right side of the rotation center of the rotating shaft along the length direction of the circuit breaker.

[0033] Preferably, the partition is provided with spaces on both sides along the height direction of the circuit breaker to form a first arc channel and a second arc channel respectively.

[0034] The beneficial effects of the present invention are:

[0035] 1. The arc extinguishing chamber of the low-voltage circuit breaker of the present invention is arranged at the bottom along the height direction thereof, and the arc is ejected from the bottom arc channel, and the arc ejection port at the incoming line end is no longer provided, so that the safety distance between the incoming line end of the circuit breaker and the busbar, the safety distance between the side of the circuit breaker and the metal plate of the switch cabinet, and the safety distance between two adjacent circuit breakers can all be reduced to zero, thereby reducing the space of the switch cabinet, and at the same time shortening the length of the connecting plate and the busbar connected to the circuit breaker, reducing the copper consumption of the switch cabinet, and reducing the cost.

[0036] 2. The arc extinguishing chamber of the low-voltage circuit breaker of the present invention is arranged at the bottom along its height direction, and the arc is ejected from the bottom arc channel, eliminating the arrangement of the arc ejection port near the incoming line end, avoiding the short circuit between the wiring screws at the incoming line end and the moving contact, and ensuring electrical safety.

[0037] 3. The arc extinguishing chamber of the low-voltage circuit breaker of the present invention is arranged away from the operating mechanism, which can avoid arc damage to the operating mechanism during disconnection.

[0038] 4. The arc channel of the low-voltage circuit breaker of the present invention is provided with an ion elimination device, which can achieve zero arcing.

[0039] 5. The grids of the arc extinguishing chamber of the low-voltage circuit breaker of the present invention are arranged transversely along the length direction thereof, and are not affected by the height direction, thereby increasing the number of arc extinguishing grids and the volume of the arc extinguishing chamber, and enhancing the arc extinguishing effect.

[0040] 6. The arc extinguishing chamber of the low-voltage circuit breaker of the present invention is arranged at the bottom along the height direction thereof, which saves space for the installation of the electronic controller.

[0041] 7. When the low-voltage circuit breaker of the present invention is applied to the drawer unit in the drawer cabinet, since the arc extinguishing chamber of the low-voltage circuit breaker of the present invention is arranged at the bottom along its height direction, the arc is ejected from the bottom arc channel, and the arc ejection port at the incoming line end is no longer arranged, so that the safe distance between the incoming line end of the circuit breaker and the metal plate of the drawer unit can be reduced to zero, which can further reduce the size of the drawer unit and avoid the secondary fault of "fire burning the camp" caused by short circuit between the drawer unit connecting plates or between the metal plates of the drawer units.

[0042] 8. When the low-voltage circuit breaker of the present invention is applied to the junction box of the DC system, since the arc extinguishing chamber of the low-voltage circuit breaker of the present invention is arranged at the bottom along its height direction, the arc is ejected from the bottom arc channel, and the arc ejection port at the incoming line end is no longer provided. The safety distance between the incoming line end of the circuit breaker and the metal plate of the junction box, the safety distance between the outgoing line end of the next row of circuit breakers and the upper row of circuit breakers, and the safety distance between the circuit breaker and the bus in the junction box can be reduced to zero, which can further reduce the size of the junction box and avoid secondary faults such as "fire burning the camp" caused by short circuits between the positive and negative bus bars or between the bus bar and the metal plate of the junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 The figure is a schematic diagram of the internal structure of a low-voltage circuit breaker in the prior art.

[0044] Figure 2 The present invention is a schematic diagram of installing a circuit breaker in a switch cabinet in the prior art.

[0045] Figure 3 This is a schematic diagram of another angle of installation of a circuit breaker in a switch cabinet in the prior art.

[0046] Figure 4 The present invention is a schematic diagram of installing a drawer unit of a circuit breaker in a drawer cabinet in the prior art.

[0047] Figure 5 The present invention is a schematic diagram of installing a circuit breaker in a combiner box in the prior art.

[0048] Figure 6 It is a schematic diagram of the overall structure of the circuit breaker according to the first embodiment of the present invention.

[0049] Figure 7 It is a schematic diagram of the internal structure of the circuit breaker according to the first embodiment of the present invention.

[0050] Figure 8 It is a schematic diagram of the operating mechanism of the circuit breaker according to the first embodiment of the present invention.

[0051] Fig. 9 This is a state diagram of the circuit breaker of the first embodiment of the present invention when the moving and static contacts are separated under a short circuit fault.

[0052] Fig.10 It is a schematic diagram of the internal structure of the second embodiment of the circuit breaker of the present invention.

[0053] Fig.11 It is a schematic diagram of the internal structure of the third embodiment of the circuit breaker of the present invention.

[0054] Fig.12 This is a schematic diagram of the operating mechanism of the third embodiment of the circuit breaker of the present invention.

[0055] Fig.13 It is a schematic diagram of the internal structure of the circuit breaker according to the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0059] First embodiment

[0060] like Figure 6 and Figure 7 As shown, this embodiment discloses a low-voltage circuit breaker, which includes an insulating housing 100 and an operating mechanism 200, a contact system 300, an arc extinguishing system 400, an overcurrent protection system 500, an outlet terminal 600 and an inlet terminal 700 arranged in the insulating housing 100. The contact system 300 includes a moving contact 310, a stationary contact 320 and a rotating shaft 330, wherein the moving contact 310 is fixed on the rotating shaft 330 and rotates together with the rotating shaft 330, and O4 is the rotation center of the rotating shaft 330. One end of the lower connecting rod 240 in the operating mechanism 200 is hinged to the rotating shaft 330, and its hinge point is O3, one end of the upper connecting rod 230 is hinged to the other end of the lower connecting rod 240, and its hinge point is O2, and the other end of the upper connecting rod 230 is hinged to the trip button 220, and its hinge point is O1. Driven by the operating mechanism 200 , the contact system 300 can be closed or opened. Figure 8The schematic diagram of the circuit breaker in the open position is shown in FIG. 2 . The hinge point O3 between the lower connecting rod 240 and the rotating shaft 330 is on the left side of the rotation center O4 of the rotating shaft 330, that is, the hinge point O3 is arranged on the side close to the incoming line terminal 700 along the length direction of the circuit breaker, that is, the X-axis direction, relative to the rotation center O4 of the rotating shaft 330. When the operating handle 210 makes the center of the spring 250 pass over the hinge point O1 between the upper connecting rod 230 and the trip button 220, the spring 250 drives the upper connecting rod 230, the upper connecting rod 230 drives the lower connecting rod 240, and the lower connecting rod 240 drives the rotating shaft 330 to rotate counterclockwise, thereby closing the contact system 300.

[0061] The stationary contact 320 may be a repulsive rotating stationary contact, such as Fig. 9 As shown, the stationary contact 320 includes a stationary contact plate 321 and a bracket 322. The stationary contact plate 321 is electrically connected to the outlet terminal 600 through a flexible conductor 323. The bracket 322 is fixed to the insulating housing 100 of the circuit breaker. The stationary contact plate 321 is rotatably connected to the bracket 322. A torsion spring 323 is provided between the stationary contact plate 321 and the bracket 322. The torsion spring 323 is coaxially arranged with the stationary contact plate 321 and the rotation center of the bracket 322, and one pin of the torsion spring 323 is fixed to the bracket 322, and the other pin acts on the stationary contact plate 321 to provide contact pressure for the stationary contact 320.

[0062] When a line fault occurs and a short-circuit current is generated, the mechanism has not yet tripped due to the tripping time. At this time, the moving contact 310 and the static contact 320 are repelled by the electromotive force of the short-circuit current. Fig. 9 This is a state diagram of the moving and static contacts of the circuit breaker of the present invention when they are separated in a short-circuit fault. After the moving contact 310 and the static contact 320 are separated, the short-circuit current can be limited from further rising, thereby playing a role in limiting the short-circuit current. At the same time, the separation of the static contact 320 can increase the opening distance between the moving contact 310 and the static contact 320 during disconnection, thereby improving the breaking capacity.

[0063] It should be noted that one end of the static contact 320 is electrically connected to the outlet terminal 600 through a flexible conductor. The benefit of such a setting is that when the moving contact 310 rotates in a direction away from the static contact 320 under the action of the operating mechanism 200, the static contact 320 also rotates in a direction away from the moving contact 310 under the action of the electric repulsive force, thereby increasing the opening distance between the moving contact 310 and the static contact 320, thereby lengthening the arc, increasing the current limiting effect, and improving the breaking capacity. The setting of the flexible conductor provides the static contact 320 with a movable space. Of course, in other embodiments, the static contact 320 can be a fixed static contact, which is electrically connected to the outlet terminal 600 through a rigid conductor. The benefit of such a setting is that it saves internal space and reduces costs.

[0064] Furthermore, a line connecting the ends of the static contacts 320 in the closed state and the open state is roughly parallel to the bottom surface of the circuit breaker, and both ends of the line point to the outlet terminal 600 and the incoming terminal 700 respectively. Such a setting has the advantage of facilitating the layout and installation of the arc extinguishing system.

[0065] One end of the moving contact 310 can be in contact with or separated from the static contact 320, and is provided with a moving contact that is in contact with or disconnected from the static contact 320, and the other end is electrically connected to the incoming line terminal 700. One end of the static contact 320 is provided with a static contact corresponding to the moving contact, and the other end is electrically connected to the outgoing line terminal 600. The outgoing line terminal 600, the static contact 320, the moving contact 310 and the incoming line terminal 700 form a circuit, and the moving contact 310 is driven to separate from or contact the static contact 320 by the operating mechanism 200, thereby realizing the closing or opening of the circuit.

[0066] An overcurrent protection system 500 is also provided in the insulating housing 100. When an overcurrent fault such as overload or short circuit occurs in the circuit, the overcurrent protection system 500 drives the movable contact 310 to disconnect from the stationary contact 320, thereby cutting off the circuit and ensuring electrical safety. The arc extinguishing system 400 is used to cool and cut the arc generated when the movable contact 310 and the stationary contact 320 are disconnected, so as to extinguish the arc and ensure electrical safety.

[0067] Furthermore, the arc extinguishing system 400 is arranged along the height direction of the circuit breaker. Figure 6 or Figure 7 The Y-axis direction shown is arranged below the moving contact 310, and an arc channel 800 is arranged on the side of the arc extinguishing system 400 away from the contact system 300. The arc channel 800 is arranged at the bottom of the insulating housing 100 along the height direction of the circuit breaker, providing a safe arc spraying channel for the arc. The arc extinguishing system 400 is arranged adjacent to the arc channel 800, and the arc extinguishing system 400 is arranged on the side of the arc channel 800 close to the top of the circuit breaker along the height direction of the circuit breaker. The top of the circuit breaker refers to the position of the handle 210 of the operating mechanism 200. Such an arrangement can ensure that the arc enters the arc channel faster after cooling and cutting from the arc extinguishing system 400, and then is discharged from the insulating housing 100 as soon as possible.

[0068] In a specific embodiment, the arc channel 800 is arranged along the length direction of the circuit breaker. Figure 6 or Figure 7The arc channel 800 is extended in the X-axis direction as shown, that is, the arc channel 800 extends from the outlet terminal 600 toward the inlet terminal 700 , and the length of the arc channel 800 is not less than the length of the arc extinguishing system 400 .

[0069] Further, the arc channel 800 is provided with a second gas outlet 820, and the second gas outlet 820 is arranged adjacent to the outlet terminal 600 along the height direction of the circuit breaker and is arranged below the outlet terminal 600, that is, the second gas outlet 820 is arranged on the side of the outlet terminal 600 close to the bottom of the circuit breaker along the height direction of the circuit breaker. In this embodiment, the second gas outlet 820 is arranged on the side away from the moving contact 310 when the moving contact 310 is opened along the length direction of the circuit breaker. After the arc is cooled and cut by the arc extinguishing system 400, it is further cooled through the arc channel 800 and discharged from the insulating housing 100 through the second gas outlet 820. An ion elimination device 830 is arranged on the arc channel 800. In this embodiment, the ion elimination device 830 is arranged on the side close to the outlet terminal 600 along the length direction of the circuit breaker, that is, the X-axis direction. The deionization device 830 includes at least one metal plate, on which a number of through holes are provided for accommodating the arc to pass through. The arc after cooling and cutting in the arc extinguishing system 400 is cooled again in the through holes to achieve the purpose of further deionization. The safety distance can be reduced to zero, which can reduce the space of the switch cabinet, shorten the length of the connecting plate and busbar connected to the circuit breaker, reduce the copper consumption of the switch cabinet, and reduce costs. It should be noted that the number of the deionization devices 830 can be one or more, and the corresponding number can be set according to the space, and there is no limitation here.

[0070] In this embodiment, the low-voltage circuit breaker is further provided with a third gas outlet 840, which is arranged on the side of the arc extinguishing system 400 close to the outlet terminal 600 along the length direction of the circuit breaker, i.e., the X-axis direction. An eliminator 830a is also arranged between the third gas outlet 840 and the second gas outlet 820. After the arc is ejected from the arc extinguishing system 400 through the third gas outlet 840, it passes through the eliminator 830a and the eliminator 830 in sequence, and finally is discharged from the circuit breaker through the second gas outlet 820. An arc channel 800 is also formed between the third gas outlet 840 and the second gas outlet 820. That is, in this embodiment, there are a plurality of arc channels 800, which are respectively located between the bottom of the arc extinguishing system 400 and the second gas outlet 820 and between the third gas outlet 840 and the second gas outlet 820.

[0071] Please continue to refer to Figure 6 and Figure 7It can be seen that the moving contact 310 and the static contact 320 are arranged adjacent to and above the arc extinguishing system 400, and the operating mechanism 200 is arranged along the height direction of the circuit breaker. Figure 6 or Figure 7 The Y-axis direction shown is arranged above the moving contact 310, and the operating mechanism 200 is arranged adjacent to the moving contact 310, and the operating mechanism 200 includes an operating handle 210, and the operating handle 210 is arranged on the top of the circuit breaker and is provided with a manual operation feature. In summary, the operating mechanism 200, the contact system 300, the arc extinguishing system 400 and the arc channel 800 are arranged in sequence from top to bottom along the height direction of the circuit breaker. It should be noted that the end connection line of the moving contact 310 in the two positions of the closed state and the open state is roughly parallel to the bottom surface of the circuit breaker, and the two ends of the connection line point to the outlet terminal 600 and the inlet terminal 700 respectively, which facilitates the layout and installation of the arc extinguishing system.

[0072] Furthermore, a cavity 110 is provided on one side of the operating mechanism 200 close to the incoming line terminal 700, and an electronic controller 900 is provided in the cavity 110. A current transformer 910 is sleeved on the flexible conductor between the outgoing line terminal 600 and the static contact 320. The current transformer 910 can collect current information of the main circuit and transmit it to the electronic controller 900. When a large current such as overload or short circuit occurs in the circuit, the current transformer 910 transmits the collected current information to the electronic controller 900. The electronic controller 900 transmits a driving signal to the overcurrent protection system 500. After receiving the driving signal, the overcurrent protection system 500 drives the contact system 300 to disconnect, thereby ensuring electrical safety.

[0073] Second embodiment

[0074] like Fig.10As shown, the second embodiment is disclosed. The difference from the first embodiment is that the low-voltage circuit breaker in this embodiment is further provided with a partition 850, which is arranged between the arc extinguishing system 400 and the bottom surface of the insulating housing 100 along the height direction of the circuit breaker, and a certain gap is respectively arranged between the arc extinguishing grid of the arc extinguishing system 400 and the bottom surface of the insulating housing 100, and the length of the partition 850 is less than the length of the arc extinguishing system 400. At this time, the arc channel 800 includes a first arc channel 800A and a second arc channel 800B, which are respectively located on both sides of the partition 850 along the height direction of the circuit breaker, the first arc channel 800A is arranged between the arc extinguishing grid of the arc extinguishing system 400 and the partition 850, and the second arc channel 800B is arranged between the partition 850 and the bottom surface of the insulating housing 100.

[0075] Correspondingly, a first air outlet 810 is provided on the arc channel 800. The first air outlet 810 is provided between the end of the partition 850 and the side wall of the arc extinguishing system 400 close to the incoming line terminal 700, and is adjacent to the incoming line terminal 700 along the height direction of the circuit breaker, and is provided below the incoming line terminal 700, that is, the first air outlet 810 is provided on the side of the incoming line terminal 700 close to the bottom of the circuit breaker along the height direction of the circuit breaker. After the arc is cooled and cut in the arc extinguishing system 400, the arc enters the second arc channel 800B through the first arc channel 800A and the first air outlet 810, which lengthens the cooling path of the arc and effectively avoids the short circuit fault caused by the short circuit between the arc after cooling and cutting and the connecting screws of the incoming line terminal 700.

[0076] Third embodiment

[0077] like Fig.11 and Fig.12 As shown, a third embodiment is disclosed, which is different from the second embodiment in that the static contact 320 of this embodiment is arranged on one side of the incoming line terminal 700 and is electrically connected to the incoming line terminal 700 through a flexible conductor. Correspondingly, the positions of the first air outlet 810 and the second air outlet 820 are also adjusted accordingly. The first air outlet 810 is arranged below the outgoing line terminal 600 along the height direction of the circuit breaker, and the second air outlet 820 is arranged below the incoming line terminal 700 along the height direction of the circuit breaker. The de-ionization device 830 is arranged on one side close to the incoming line terminal 700 along the length direction of the circuit breaker, i.e., the X-axis direction.

[0078] Specifically, in this example, the static contact 320 is connected to the incoming terminal 700 through a flexible conductor, and the moving contact 310 is connected to the outgoing terminal 600 through a flexible conductor. The end connection line of the moving contact in the closed state and the open state is roughly parallel to the bottom surface of the circuit breaker, and the two ends of the connection line point to the incoming terminal 700 and the outgoing terminal 600 respectively. Fig.11 This is the schematic diagram of the circuit breaker in the open position, such as Fig.11 As shown, at this time, one end of the lower link 240 of the operating mechanism 200 is hinged to the rotating shaft 330 at a hinge point O3', one end of the upper link 230 and the other end of the lower link 240 are hinged to the hinge point O2', the other end of the upper link 230 and the trip button 220 are hinged to the hinge point O1', and the rotation center of the rotating shaft 330 is O4'. In this embodiment, the hinge point O3' of the lower link 240 and the rotating shaft 330 is on the right side of the rotation center O4' of the rotating shaft, that is, the hinge point O3' is arranged on the side close to the outlet terminal 600 relative to the rotation center O4' of the rotating shaft 330 along the length direction of the circuit breaker, that is, the X-axis direction. At this time, when the operating handle 210 makes the center of the spring 250 pass over the hinge point O1', the spring 250 drives the upper connecting rod 230, the upper connecting rod 230 drives the lower connecting rod 240, and the lower connecting rod 240 drives the rotating shaft 330 to rotate clockwise, so that the contact system 300 is closed.

[0079] Fourth embodiment

[0080] like Fig.13 As shown, a fourth embodiment is disclosed, which is different from the third embodiment in that the first air outlet 810 is cancelled, and a fourth air outlet 810' is added. The fourth air outlet 810' is arranged on the side of the arc extinguishing system 400 close to the outlet terminal 600 along the length direction of the circuit breaker, that is, the X-axis direction, and a fifth air outlet 410 is arranged on the arc-striking grid of the arc extinguishing system 400. The arc-striking grid refers to the side of the arc extinguishing system 400 close to the moving contact 310 along the X-axis direction. Fig.13 The rightmost grid is shown.

[0081] Specifically, in this example, the fifth gas outlet 410 is opened on the right grid of the arc extinguishing system 400, and the fourth gas outlet 810' is set on the right side of the arc extinguishing system 400. When disconnecting, the high-temperature and high-pressure free gas passes through the deionizing device 830 into the arc channel 800, and finally sprays out of the circuit breaker through the second gas outlet 820.

[0082] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed application subject matter.

Claims

1. A circuit breaker, comprising an insulating housing (100) and an operating mechanism (200), a contact system (300), an arc extinguishing system (400), an overcurrent protection system (500), an outlet terminal (600) and an inlet terminal (700) arranged in the insulating housing (100), characterized in that A partition (850) is provided between the arc extinguishing system (400) and the bottom of the insulating housing (100), an arc channel (800) is provided at the bottom of the insulating housing (100), a first gas outlet (810) is provided between the arc extinguishing system (400) and the arc channel (800), and the first gas outlet (810) is provided on a side of the outlet terminal (600) or the inlet terminal (700) close to the bottom of the circuit breaker, and the arc channel (800) is provided with a second gas outlet (820), and the second gas outlet (820) is provided adjacent to the outlet terminal (600) or the inlet terminal (700) along the height direction of the circuit breaker and close to a side of the bottom of the circuit breaker.

2. The circuit breaker according to claim 1, characterized in that: The length of the arc channel (800) is not less than the length of the arc extinguishing system (400).

3. The circuit breaker according to claim 1, characterized in that: The arc extinguishing system (400) is arranged adjacent to the arc channel (800) along the height direction of the circuit breaker and is arranged on a side close to the top of the circuit breaker.

4. The circuit breaker according to claim 1, characterized in that: The contact system (300) comprises a moving contact (310) and a stationary contact (320); the stationary contact (320) is a fixed stationary contact or a repulsive rotational stationary contact.

5. The circuit breaker according to claim 4, characterized in that: The moving contact (310) and the stationary contact (320) are respectively arranged adjacent to the arc extinguishing system (400) along the height direction of the circuit breaker and are arranged on one side close to the top of the circuit breaker.

6. The circuit breaker according to claim 4, characterized in that: The operating mechanism (200) is arranged adjacent to the moving contact (310) along the height direction of the circuit breaker and is arranged on a side close to the top of the circuit breaker.

7. The circuit breaker according to claim 1, characterized in that: The arc channel (800) is extended in the length direction of the circuit breaker.

8. The circuit breaker according to claim 7, characterized in that: The first air outlet (810) is arranged adjacent to the outlet terminal (600) or the inlet terminal (700) along the height direction of the circuit breaker.

9. The circuit breaker according to claim 1, characterized in that: The arc channel (800) is provided with a third gas outlet (840), and the third gas outlet (840) is arranged on one side of the arc extinguishing system (400) close to the outlet terminal (600) along the length direction of the circuit breaker.

10. The circuit breaker according to claim 9, characterized in that The arc channel (800) is provided between the bottom of the arc extinguishing system (400) and the second gas outlet (820) and / or between the second gas outlet (820) and the third gas outlet (840).

11. The circuit breaker according to claim 1, characterized in that: The arc channel (800) is provided with a second gas outlet (820), the second gas outlet (820) being arranged opposite to the first gas outlet (810) along the length direction of the circuit breaker, and being arranged on one side of the outlet terminal (600) or the inlet terminal (700) close to the bottom of the circuit breaker along the length direction of the circuit breaker.

12. The circuit breaker according to claim 1, characterized in that: The contact system (300) comprises a moving contact (310) and a stationary contact (320), and the second air outlet (820) is arranged along the length direction of the circuit breaker on a side away from the moving contact (310) when the moving contact (310) is opened.

13. The circuit breaker according to claim 1, characterized in that: The first air outlet (810) and / or the second air outlet (820) is provided with an anti-ionization device (830).

14. The circuit breaker according to claim 13, characterized in that: The de-ionization device (830) is arranged adjacent to the outlet terminal (600) or the inlet terminal (700) along the height direction of the circuit breaker and is arranged on a side of the outlet terminal (600) or the inlet terminal (700) close to the bottom of the circuit breaker.

15. The circuit breaker according to claim 1, characterized in that: The operating mechanism (200), the contact system (300), the arc extinguishing system (400), and the arc channel (800) are arranged in sequence along the height direction of the circuit breaker.

16. The circuit breaker according to claim 4, characterized in that: The connecting line between the ends of the moving contact (310) in the closed state and the open state is parallel to the bottom surface of the circuit breaker, and the two ends of the connecting line point to the outgoing terminal (600) and the incoming terminal (700) respectively.

17. The circuit breaker according to claim 4, characterized in that: The static contact (320) is a repulsive rotation type static contact, and a line connecting the ends of the static contact (320) in a closed state and an open state is parallel to the bottom surface of the circuit breaker, with both ends of the line pointing to the outgoing terminal (600) and the incoming terminal (700) respectively.

18. The circuit breaker according to claim 1, characterized in that: A cavity (110) is provided on a side of the operating mechanism (200) close to the incoming line end (700), and an electronic controller (900) is provided in the cavity (110).

19. The circuit breaker according to claim 4, characterized in that: The static contact (320) is arranged on one side of the incoming line terminal (700) or the outgoing line terminal (600).

20. The circuit breaker according to claim 4, characterized in that: The moving contact (310) contacts or disconnects with a stationary contact (320) provided on one side of the incoming line terminal (700) or provided on one side of the outgoing line terminal (600).

21. The circuit breaker according to claim 19, characterized in that: The operating mechanism (200) comprises a lower connecting rod (240) and a rotating shaft (330), wherein a hinge point between the lower connecting rod (240) and the rotating shaft (330) is arranged on the left side or the right side of a rotation center of the rotating shaft (330) along the length direction of the circuit breaker.

22. The circuit breaker according to claim 1, characterized in that: The partition plate (850) is provided with spaces on both sides along the height direction of the circuit breaker, respectively forming a first arc channel (800A) and a second arc channel (800B).

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