Plug-in circuit breaker

Abstract

A plug-in circuit breaker comprises a shell, a handle, an operating mechanism, an electromagnetic system, a thermal system, an arc extinguishing device, a first wiring terminal, a second wiring terminal, a moving contact and a static contact, the handle is arranged at the operating end of the shell, and the first wiring terminal and the second wiring terminal are both arranged at the wiring end of the shell; the handle, the electromagnetic system, the static contact and the first wiring terminal are sequentially arranged in the first direction, the thermal system part and the second wiring terminal are arranged in the first direction, the first wiring terminal and the second wiring terminal are sequentially arranged in the second direction, and the operating mechanism is located on one side of the handle and the electromagnetic system in the second direction. The operating mechanism part is located between the electromagnetic system and the thermal system in the second direction, and the arc extinguishing device is located in an area defined by the electromagnetic system, the first wiring terminal, the thermal system and the static contact. According to the plug-in circuit breaker, the operating mechanism is moved upwards to the position above the handle and the electromagnetic system, so that the electromagnetic system, the moving contact and the static contact are arranged in the direction close to the handle in an offset mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low-voltage apparatus, specifically relates to a plug-in circuit breaker. BACKGROUND

[0002] The existing plug-in circuit breaker has the problems of loose layout structure and non-compactness, resulting in excessively large size of the circuit breaker, but the plug-in circuit breaker needs frequent plug-in and plug-out operations, and the large-size circuit breaker causes great inconvenience to use. UTILITY MODEL CONTENTS

[0003] The utility model aims at overcoming at least one defect of the prior art and providing a plug-in circuit breaker.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The plug-in circuit breaker comprises a shell, a handle, an operating mechanism, an electromagnetic system and a thermal system for driving the operating mechanism to trip, an arc extinguishing device, a first wiring terminal, a second wiring terminal, a moving contact and a stationary contact, the operating mechanism is connected between the handle and the moving contact, the handle is arranged at an operating end of the shell,

[0006] The first wiring terminal and the second wiring terminal are arranged at wiring ends of the shell away from the operating end;

[0007] The handle, the electromagnetic system, the stationary contact and the first wiring terminal are arranged in a first direction in sequence,

[0008] The thermal system is arranged in the first direction at least partially with the second wiring terminal,

[0009] The first wiring terminal and the second wiring terminal are arranged in a second direction in sequence, the operating mechanism is located on one side of the handle and the electromagnetic system in the second direction, the operating mechanism is located at least partially between the electromagnetic system and the thermal system in the second direction, the arc extinguishing device is located in a region surrounded by the electromagnetic system, the first wiring terminal, the thermal system and the stationary contact, and the first direction and the second direction are perpendicular to each other.

[0010] Optionally, the handle is rotationally arranged at the operating end of the shell, an axis of rotation of the handle is arranged in a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0011] Optionally, a movement direction of a moving iron core of the electromagnetic system is arranged in the second direction.

[0012] Optionally, the plug-in circuit breaker further comprises a locking structure, and the electromagnetic system and a locking member of the locking structure are arranged in the third direction in sequence.

[0013] Optionally, the arc extinguishing device comprises an arc extinguishing chamber, the arc extinguishing chamber is located between the first terminal and the second terminal at least in the second direction.

[0014] Optionally, the arc extinguishing device comprises a first arc extinguishing chamber and a second arc extinguishing chamber, the first arc extinguishing chamber is located between the electromagnetic system and the first terminal in the first direction and is located on the side of the static contact away from the moving contact in the second direction, the first arc extinguishing chamber comprises a plurality of first arc extinguishing fins arranged at intervals, the second arc extinguishing chamber is located between the first terminal and the second terminal in the second direction, the second arc extinguishing chamber comprises a plurality of second arc extinguishing fins arranged at intervals, and the first arc extinguishing fins and the second arc extinguishing fins are arranged at an angle.

[0015] Optionally, the second arc extinguishing fins are arranged obliquely towards the moving contact close to the breaking position.

[0016] Optionally, the first arc extinguishing fins are arranged perpendicularly to the first direction.

[0017] Optionally, the arc extinguishing device further comprises an arc striking member, and the arc striking member is located between the first arc extinguishing chamber and the second arc extinguishing chamber.

[0018] Optionally, the arc striking member is in a V-shaped structure, the opening of the V-shaped structure is arranged towards the first terminal, one end of the arc striking member close to the first arc extinguishing chamber is parallel to the first arc extinguishing fins, and the other end of the arc striking member close to the second arc extinguishing chamber is parallel to the second arc extinguishing fins.

[0019] Optionally, the static contact comprises a static contact plate electrically connected to the electromagnetic system and a static contact point arranged on the static contact plate, one end of the static contact plate provided with the static contact point is bent towards the direction away from the moving contact to form an arc striking corner, and the electromagnetic system is electrically connected to the first terminal.

[0020] Optionally, the thermal system comprises a bimetallic strip and an arc striking member, one end of the bimetallic strip is connected to one end of the arc striking member, the other end of the bimetallic strip is located on the side of the moving contact away from the static contact, the middle part of the arc striking member is provided with an arc striking part protruding towards the moving contact close to the breaking position, and the other end of the arc striking member is arranged parallel to one side of the arc extinguishing device.

[0021] Optionally, a part of the bimetallic strip of the thermal system is located between the first terminal and the second terminal in the second direction, and the other part of the bimetallic strip of the thermal system and the second terminal are arranged in sequence along the first direction.

[0022] Optionally, a part of the bimetallic strip of the thermal system is located on the side of the second terminal away from the first terminal in the second direction, and the other part of the bimetallic strip of the thermal system and the second terminal are arranged in sequence along the first direction.

[0023] Optionally, the first and second connecting terminals are both elastic clamping structures, and the connecting terminal is provided with a first connecting hole corresponding to the first connecting terminal and a second connecting hole corresponding to the second connecting terminal.

[0024] The plug-in circuit breaker of the utility model, through moving the operating mechanism to the upper side of the handle and the electromagnetic system, makes the electromagnetic system, the static contact and the dynamic contact whole offset setting to the direction of approaching the handle, saves the space, thereby lets the space for the arc extinguishing device, can improve the arc extinguishing capacity, and the layout is more compact and reasonable, reduces the size in the first direction of the circuit breaker, makes the circuit breaker more compact and miniaturization, facilitates the plug-in operation of the circuit breaker.

[0025] In addition, the electromagnetic system is vertically arranged, which makes the layout more compact and further saves space.

[0026] In addition, the first arc extinguishing chamber and the second arc extinguishing chamber are arranged at an angle, which facilitates arranging more arc extinguishing vanes in limited space and improves breaking capacity. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the structure schematic diagram of the circuit breaker in the opening state of the utility model, and shows the arc extinguishing device of embodiment one;

[0028] Figure 2 It is the sectional view of the circuit breaker in the state of closing and unable to insert the meter box of the utility model;

[0029] Figure 3 It is the view of the circuit breaker in the state of closing and unable to insert the meter box of the utility model;

[0030] Figure 4 It is the sectional view of the circuit breaker in the state of inserting and unable to close of the utility model;

[0031] Figure 5 It is the view of the circuit breaker in the state of inserting and unable to close of the utility model;

[0032] Figure 6 It is the sectional view of the circuit breaker in the state of installing of the utility model;

[0033] Figure 7 It is the view of the circuit breaker in the state of installing of the utility model;

[0034] Figure 8 It is the sectional view of the circuit breaker in the opening state of the utility model;

[0035] Figure 9 It is the sectional view of the circuit breaker in the closing state of the utility model;

[0036] Figure 10 It is the perspective view of the locking piece of the utility model;

[0037] Figure 11 is a view of the locking piece of the utility model;

[0038] Figure 12 is a view of the circuit breaker cover of the utility model, which shows the arc extinguishing device of embodiment two;

[0039] Figure 13 is a perspective view of the circuit breaker cover of the utility model, which shows the arc extinguishing device of embodiment two.

[0040] Housing 100; Anti-pull hole 101; Operating end 102; Wiring end 103; First wiring hole 104; Second wiring hole 105; Positioning step 106; Handle 200; Locking matching part 201; Blocking part 202; Driven part 203; Locking piece 300; Locking part 301; Avoidance groove 302; Limiting part 303; First driven inclined surface 304; Matching surface 305; Second driven inclined surface 306; Connection platform 307; Elastic piece 310; Pulling device 400; Driving part 401; Operating mechanism 500; Electromagnetic system 510; Thermal system 600; Bimetallic strip 610; Soft connection 611; Arc attracting piece 620; Arc attracting part 621; Conductive sheet 630; Arc extinguishing device 700; First arc extinguishing chamber 710; First arc extinguishing grid sheet 711; First side plate 712; Second arc extinguishing chamber 720; Second arc extinguishing grid sheet 721; Second side plate 722; Arc attracting piece 730; Third arc extinguishing chamber 740; Third arc extinguishing grid sheet 741; Third side plate 742; First wiring terminal 800; Second wiring terminal 810; Moving contact 820; Stationary contact 830; Stationary contact plate 831; Stationary contact point 832; Arc attracting angle 833; Positioning plate 900; Limiting hole 901; Cover plate 910; First busbar 920; Second busbar 930. DETAILED DESCRIPTION

[0041] The following embodiments given in combination with the drawings further illustrate the specific implementation of the plug-in circuit breaker of the utility model. The plug-in circuit breaker of the utility model is not limited to the description of the following embodiments.

[0042] As Figure 1 and Figure 6As shown, the plug-in circuit breaker of the embodiment comprises a housing 100, a handle 200 for driving the circuit breaker to open and close, an operating mechanism 500, an electromagnetic system 510 for driving the operating mechanism 500 to trip, a thermal system 600, an arc extinguishing device 700, a first wiring terminal 800 for connecting with a first bus 920, a second wiring terminal 810 for connecting with a second bus 930, a movable contact 820 and a stationary contact 830 matched with each other, the movable contact 820 and the stationary contact 830 are electrically connected with the first wiring terminal 800 and the second wiring terminal 810 respectively, in the embodiment, the electromagnetic system 510 is electrically connected between the first wiring terminal 800 and the stationary contact 830, the thermal system 600 is electrically connected between the second wiring terminal 810 and the movable contact 820, the operating mechanism 500 is connected between the handle 200 and the movable contact 820, the handle 200 is arranged at an operating end 102 of the housing 100 and can rotate between a closed position and an open position, the handle 200 can drive the operating mechanism 500 to make the movable contact 820 contact or separate from the stationary contact 830, the electromagnetic system 510 is used to trigger the operating mechanism 500 to trip when a short circuit occurs, and the thermal system 600 is used to trigger the operating mechanism 500 to trip when an overload occurs; the first wiring terminal 800 and the second wiring terminal 810 are both arranged at a wiring end 103 of the housing 100 away from the operating end 102.

[0043] An improved point of the embodiment is the layout of the circuit breaker, the handle 200, the electromagnetic system 510, the stationary contact 830 and the first wiring terminal 800 are arranged in a first direction in sequence, the thermal system 600 is at least partially arranged in the first direction with the second wiring terminal 810, the first wiring terminal 800 and the second wiring terminal 810 are arranged in a second direction in sequence, the operating mechanism 500 is located on one side of the handle 200 and the electromagnetic system 510 in the second direction, the operating mechanism 500 is at least partially located between the electromagnetic system 510 and the thermal system 600 in the second direction, the arc extinguishing device 700 is located in an area surrounded by the electromagnetic system 510, the second wiring terminal 810, the thermal system 600 and the stationary contact 830, and the first direction and the second direction are perpendicular to each other.

[0044] It should be noted that the operating mechanism 500 is a prior art, which generally comprises a linkage structure, the linkage structure generally comprises a linkage, a lever, a lock catch and a trip catch matched with each other, the lock catch and the trip catch are rotatably arranged on the lever, the linkage is connected between the trip catch and the handle 200, the movable contact is mounted on the lever, and the handle 200 drives the movable contact 820 to contact or separate from the stationary contact 830 through the linkage structure; the electromagnetic system 510 and the thermal system 600 can make the operating mechanism 500 trip by pushing the lock catch to rotate to release the matched lock catch and trip catch, and drive the movable contact 820 to separate from the stationary contact 830 to realize the tripping protection, which will not be described here.

[0045] The plug-in circuit breaker of the embodiment saves space by moving the operating mechanism 500 upward to above the handle 200 and the electromagnetic system 510, and by setting the electromagnetic system 510, the static contact 830 and the dynamic contact 820 as a whole to be offset toward the handle 200, thereby leaving more space for the arc extinguishing device 700, improving the arc extinguishing capacity, and making the layout more compact and reasonable, reducing the size of the circuit breaker in the first direction, and making the circuit breaker more compact and miniaturized, and facilitating the plug-in and plug-out operation of the circuit breaker.

[0046] In the embodiment, the first and second wiring terminals 800 and 810 are both in the elastic clamping structure, the connection direction between the first wiring terminal 800 and the first bus 920 is set along the first direction, and the connection direction between the second wiring terminal 810 and the second bus 930 is set along the first direction; the wiring terminal 103 is provided with the first wiring hole 104 corresponding to the first wiring terminal 800 and the second wiring hole 105 corresponding to the second wiring terminal 810, the first and second buses 920 and 930 are inserted into the shell 100 along the first direction to be electrically connected with the first and second wiring terminals 800 and 810, and the first and second buses 920 and 930 are respectively used to connect the power supply and the load.

[0047] Further, the handle 200 is rotationally arranged at the operating end 102 of the shell 100, the rotation axis of the handle 200 is set along the third direction, and the first, second and third directions are perpendicular to each other. It should be noted that the first direction is the X direction in Figure 1 , the second direction is the Y direction in Figure 1 , and the third direction is the direction perpendicular to the drawing in Figure 1 . Of course, as other embodiments, the handle 200 can also be slidingly arranged at the operating end 102 of the shell 100.

[0048] Preferably, the direction in which the electromagnetic system 510 drives the operating mechanism 500 is set along the second direction, i.e. the movement direction of the moving iron core of the electromagnetic system 510. In this way, the electromagnetic system 510 is vertically arranged, making the layout more compact and further saving space. Of course, the direction in which the electromagnetic system 510 drives the operating mechanism 500 can also be set at an angle to the second direction.

[0049] It should be noted that the electromagnetic system 510 is a prior art, which generally comprises a coil frame, a coil wound on the coil frame, an opposite arranged moving iron core and a static iron core, a top rod moving synchronously with the moving iron core, and a reset spring for resetting the moving iron core; when a short-circuit current occurs in the main circuit of the circuit breaker where the coil is located, the moving iron core and the static iron core are attracted, the top rod moves with the moving iron core to push the lock catch to rotate, so that the operating mechanism is unlocked and tripped, and the circuit breaker is broken to realize the breaking protection, which will not be described here. The direction of the electromagnetic system 510 driving the operating mechanism 500 refers to the movement direction of the top rod during the attraction of the moving iron core and the static iron core.

[0050] As shown in Figure 1 and Figure 2 , embodiment one of the arc extinguishing device 700, the arc extinguishing device 700 of the embodiment comprises a first arc extinguishing chamber 710 and a second arc extinguishing chamber 720, the first arc extinguishing chamber 710 is located between the electromagnetic system 510 and the first wiring terminal 800 in the first direction, and is located on the side of the static contact 830 away from the moving contact 820 in the second direction, the first arc extinguishing chamber 710 comprises a plurality of first arc extinguishing fins 711 arranged at intervals; the second arc extinguishing chamber 720 is located between the first wiring terminal 800 and the second wiring terminal 810 in the second direction, the second arc extinguishing chamber 720 comprises a plurality of second arc extinguishing fins 721 arranged at intervals, and the first arc extinguishing fins 711 and the second arc extinguishing fins 721 are arranged at an angle. That is, the second arc extinguishing fins 721 are arranged obliquely relative to the first arc extinguishing fins 711, in the embodiment, the first arc extinguishing fins 711 are arranged along the second direction, the second arc extinguishing fins 721 are arranged at an acute angle with the first arc extinguishing fins 711, and preferably between 30 degrees and 60 degrees. The first arc extinguishing chamber 710 and the second arc extinguishing chamber 720 are arranged at an angle, which facilitates arranging more arc extinguishing fins in a limited space and improving the breaking capacity.

[0051] In the embodiment, the first arc extinguishing chamber 710 and the second arc extinguishing chamber 720 are separately arranged, the first arc extinguishing chamber 710 further comprises two first side plates 712, the two first side plates 712 are arranged opposite at intervals along the third direction, and the first arc extinguishing fins 711 are arranged between the two first side plates 712; the second arc extinguishing chamber 720 further comprises two second side plates 722, the two second side plates 722 are arranged opposite at intervals along the third direction, and the second arc extinguishing fins 721 are arranged between the two second side plates 722. The side plates and the arc extinguishing fins can be designed in a conventional shape, which has strong versatility and is convenient for production.

[0052] Of course, as other embodiments, the first arc-extinguishing chamber 710 and the second arc-extinguishing chamber 720 can also be integrally arranged, and the arc-extinguishing device 700 further comprises two shared side plates shared by the first arc-extinguishing chamber 710 and the second arc-extinguishing chamber 720, the two shared side plates are oppositely arranged along the third direction, and the first arc-extinguishing vane 711 and the second arc-extinguishing vane 721 are respectively arranged between the two shared side plates.

[0053] Preferably, the first arc-extinguishing vane 711 of the first arc-extinguishing chamber 710 is arranged perpendicularly to the first direction, so that the first arc-extinguishing chamber 710 can arrange more arc-extinguishing vanes to improve the arc-extinguishing capacity. The second arc-extinguishing vane 721 of the second arc-extinguishing chamber 720 is arranged obliquely to the direction of the moving contact 820 close to the breaking position, which is more conducive to the extinction of the arc and improves the arc-extinguishing effect.

[0054] Further, the arc-extinguishing device 700 of the embodiment further comprises an arc guiding member 730, which is located between the first arc-extinguishing chamber 710 and the second arc-extinguishing chamber 720. The arc guiding member 730 makes the arc quickly transfer from the second arc-extinguishing chamber 720 to the first arc-extinguishing chamber 710.

[0055] Preferably, the arc guiding member 730 is in a V-shaped structure, and the opening is arranged towards the first connecting terminal 800. One end of the arc guiding member 730 close to the first arc-extinguishing chamber 710 is parallel to the first arc-extinguishing vane 711, and the other end of the arc guiding member 730 close to the second arc-extinguishing chamber 720 is parallel to the second arc-extinguishing vane 721.

[0056] In the embodiment, the stationary contact 830 comprises a stationary contact plate 831 electrically connected with the electromagnetic system 510 and a stationary contact point 832 arranged on the stationary contact plate 831. One end of the stationary contact plate 831 provided with the stationary contact point 832 is bent to form an arc guiding corner 833 in a direction away from the moving contact 820 and close to the first arc-extinguishing chamber 710, so as to facilitate the arc on the stationary contact 830 to quickly transfer to the first arc-extinguishing chamber 710.

[0057] In this embodiment, the thermal system 600 includes a bimetallic strip 610, an arc-quenching element 620, and a conductive sheet 630. One end of the bimetallic strip 610 is connected to one end of the arc-quenching element 620 and is connected to the second terminal 810 via the conductive sheet 630. The other end of the bimetallic strip 610 is located on the side of the moving contact 820 away from the stationary contact 830 and is electrically connected to the moving contact 820 via a flexible connection 611. The arc-quenching element 620 has an arc-quenching portion 621 protruding from its middle towards the moving contact 820 near the break position. The other end of the arc-quenching element 620 is arranged parallel to one side of the second arc-quenching chamber 720 of the arc-extinguishing device 700, facilitating the rapid transfer of the arc on the moving contact 820 to the second arc-quenching chamber 720. When the moving contact 820 and the stationary contact 830 separate and an arc is generated, the arc on the stationary contact 830 enters the first arc-extinguishing chamber 710 along the arc-starting angle 83, and the arc on the moving contact 820 jumps to the arc-catching part 621 of the arc-catching member 620, and then transfers along the arc-catching member 620 into the second arc-extinguishing chamber 720. The conductive sheet 630 can be a rigid connection or a flexible connection.

[0058] Preferably, a portion of the bimetallic strip 610 of the thermal system 600, along with the conductive sheet 630 and the arc-extinguishing element 620, is located in the second direction between the first terminal 800 and the second terminal 810, while the other portion of the bimetallic strip 610 and the second terminal 810 are arranged sequentially along the first direction. Thus, the second arc-extinguishing chamber 720 is located in the second direction between the first terminal 800 and a portion of the thermal system 600.

[0059] like Figure 12 and Figure 13 As shown in Embodiment 2 of the arc-extinguishing device 700, the arc-extinguishing device 700 includes only a single large-sized arc-extinguishing chamber. At least part of the arc-extinguishing chamber is located in the second direction between the first terminal 800 and the second terminal 810. The arc-extinguishing chamber is arranged in a straight, arc-shaped, or J-shaped configuration (i.e., the multiple arc-extinguishing grids of the arc-extinguishing chamber are spaced apart in a straight, arc-shaped, or J-shaped pattern). The arc-extinguishing device 700 in this embodiment has a simpler structure.

[0060] Specifically, the arc extinguishing device 700 of the embodiment does not provide the arc striking member 730, and includes a third arc extinguishing chamber 740 which is straight as a whole. A part of the third arc extinguishing chamber 740 is located between the first connecting terminal 800 and the second connecting terminal 810 in the second direction. Another part of the third arc extinguishing chamber 740 is located between the electromagnetic system 510 and the first connecting terminal 800 in the first direction, and is located on the side of the static contact 830 away from the moving contact 820 in the second direction. The third arc extinguishing chamber 740 includes a plurality of third arc extinguishing fins 741 arranged at intervals. The third arc extinguishing chamber 740 further includes two third side plates 742 arranged at intervals in the third direction. The third arc extinguishing fins 741 are arranged between the two third side plates 742, and the third arc extinguishing fins 741 are arranged perpendicularly to the first direction.

[0061] In the embodiment, the arc striking angle 833 of the static contact 830 is arranged to bend in the direction away from the moving contact 820 and close to the third arc extinguishing chamber 740, and extends into the third arc extinguishing chamber 740. The arc attracting member 620 of the thermal system 600 is arranged in parallel to one end of the bimetallic strip 610 on one side of the third arc extinguishing chamber 740 of the arc extinguishing device 700 in the second direction. When the moving contact 820 and the static contact 830 are separated to generate an arc, the arc on the static contact 830 enters the third arc extinguishing chamber 740 through the arc striking angle 833, and the arc on the moving contact 820 jumps to the arc attracting part 621 of the arc attracting member 620, and then is transferred to the third arc extinguishing chamber 740 through the arc attracting member 620.

[0062] In the embodiment, a part of the bimetallic strip 610 of the thermal system 600 is located on the side of the second connecting terminal 810 away from the first connecting terminal 800 in the second direction, i.e., the second connecting terminal 810 is located between the first connecting terminal 800 and the part of the bimetallic strip 610 in the second direction. Another part of the bimetallic strip 610 of the thermal system 600 and the second connecting terminal 810 are arranged in sequence in the first direction. The other part of the bimetallic strip 610 is located on the side of the moving contact 820 away from the static contact 830 in the second direction, i.e., the moving contact 820 is located between the static contact 830 and the other part of the bimetallic strip 610 in the second direction.

[0063] The end of the arc attracting member 620 of the thermal system 600 connected to the bimetallic strip 610 is located on the side of the second connecting terminal 810 away from the first connecting terminal 800 in the second direction. The second connecting terminal 810 is located in the arc attracting part 621 of the middle part of the arc attracting member 620. The end of the arc attracting member 620 away from the bimetallic strip 610 is located between the first connecting terminal 800 and the second connecting terminal 810 in the second direction.

[0064] As Figure 6 and Figure 7As shown, the plug-in circuit breaker is usually plug-in installed in a panel box or a cabinet, and in the example, the plug-in circuit breaker of the embodiment is plug-in installed in a panel box, which comprises an openable cover plate 910 and a positioning plate 900 for guiding and positioning the installation of the circuit breaker. The circuit breaker is slidingly arranged on the positioning plate 900, i.e. the plug-in direction of the circuit breaker is parallel to the positioning plate 900, and the circuit breaker can be switched between an inserted or pulled-out state and an installed final state, wherein the circuit breaker comprises a housing 100, and the side of the housing 100 facing the positioning plate 900 is provided with an anti-pulling hole 101, and the operation end 102 of the housing 100 is provided with a positioning step 106. When the cover plate 910 is in a closed state, it covers the operation end 102 of the housing 100 and abuts against the positioning step 106.

[0065] As shown in Figure 1 and Figure 3 As shown, the plug-in circuit breaker of the embodiment further comprises a locking structure of the plug-in circuit breaker for cooperating with the panel box or the cabinet. The locking structure of the plug-in circuit breaker of the embodiment comprises a locking member 300 slidingly arranged in the housing 100 and an elastic member 310 connected with the locking member 300, and the handle 200 comprises a locking matching part 201 and a blocking part 202; the locking member 300 can move between a first position and a second position, and the locking member 300 comprises a locking part 301 for locking matching with the locking matching part 201 and a limiting part 303 for cooperating with the anti-pulling hole 101, and the limiting part 303 can extend out of or retract into the anti-pulling hole 101. Wherein, the blocking part 202 is used to block the movement of the locking member 300 to the second position when the handle 200 is located at the closed position, so that the limiting part 303 cannot retract into the anti-pulling hole 101, and the circuit breaker in the closed state cannot be inserted or pulled out; when the handle 200 is located at the open position, the locking member 300 can move to the second position against the force of the elastic member 310, so that the limiting part 303 retracts into the anti-pulling hole 101, and the locking part 301 is locked and matched with the locking matching part 201; the elastic member 310 is used to drive the locking member 300 to move to the first position, so that the limiting part 303 extends out of the anti-pulling hole 101, and the locking part 301 is unlocked and matched with the locking matching part 201. The electromagnetic system 510 and the locking member 300 of the locking structure are arranged in sequence along a third direction. Of course, the locking structure can also be other structures in the prior art.

[0066] As shown in Figures 2-5 When the circuit breaker is in the inserted or pulled-out state, the positioning plate 900 can drive the limiting part 303 to retract into the anti-pulling hole 101, and the locking part 301 of the locking member 300 is locked and matched with the locking matching part 201, so that the handle 200 cannot be rotated in the direction of the closed position; as shown in Figures 6-7As shown, when the circuit breaker is in the installed final state, i.e. after the circuit breaker is installed in place, the elastic member 310 can drive the locking member 300 to make the limiting portion 303 extend out of the anti-plug hole 101 and limit the cooperation with the positioning plate 900, so that the locking portion 301 of the locking member 300 is released from the locking cooperation with the locking cooperation portion 201, at this time the handle 200 can be rotated from the open position to the closed position to perform the closing operation.

[0067] The plug-in circuit breaker of the embodiment blocks the locking member 300 from retracting into the shell 100 by the handle 200 in the closed position, and the locking member 300 is forced to retract into the shell 100 to lock the handle 200 in the open position during the plug-in and plug-out of the circuit breaker, so that the circuit breaker cannot be plugged in or out under the live condition before, during or after the plug-in, ensuring safety.

[0068] Preferably, the plug-in direction of the circuit breaker, the sliding direction of the locking member 300 and the rotation axis direction of the handle 200 are perpendicular to each other. It should be noted that the plug-in direction of the circuit breaker is the first direction; the direction of the locking member 300 retracting into the shell 100 is the second direction. Simplifying the structure and action relationship also facilitates compact and reasonable arrangement. Of course, the plug-in direction of the circuit breaker, the sliding direction of the locking member 300 and the rotation axis direction of the handle 200 can also be arranged at other angles.

[0069] As shown in Figure 3 , Figure 5 and Figure 7 , the cooperation structure between the positioning plate 900 and the locking member 300 of the embodiment, the limiting portion 303 of the locking member 300 is provided with a first driven inclined surface 304, a cooperation surface 305 and a second driven inclined surface 306 connected in sequence, the first driven inclined surface 304 and the second driven inclined surface 306 are respectively arranged at an angle with the plug-in direction of the circuit breaker, and the cooperation surface 305 limits the locking member 300 in the second position when forced; the positioning plate 900 is provided with a limiting hole 901.

[0070] As shown in Figures 2-5 , when the circuit breaker is in the plug-in state, the first driven inclined surface 304 can interfere with the side in the thickness direction of the positioning plate 900 to drive the locking member 300 to make the limiting portion 303 retract into the anti-plug hole 101, and the positioning plate 900 blocks the cooperation surface 305 to make the limiting portion 303 unable to extend out of the anti-plug hole 101; as Figures 6-7As shown, when the circuit breaker is in the installed end state, the limiting portion 303 is limited in the limiting hole 901; when the circuit breaker is in the pulling-out middle state, the second driven slope 306 can interfere with the side wall of the limiting hole 901 to drive the locking piece 300, so that the limiting portion 303 is retracted into the anti-pulling hole 101, and the positioning plate 900 blocks the cooperation surface 305, so that the limiting portion 303 cannot be extended out of the anti-pulling hole 101. The stress position of the locking piece 300 is switched between the slope and the cooperation surface 305, so that the locking piece 300 is automatically extended or retracted out of the shell 100 during the plugging and pulling of the circuit breaker, without the need to additionally set an unlocking piece, thereby simplifying the structure.

[0071] Preferably, the cooperation surface 305 is a plane parallel to the plugging direction of the circuit breaker. The structure is simple and easy to be formed. Of course, the cooperation surface 305 can also be an arc surface or other structures. The first driven slope 304 and the second driven slope 306 are symmetrically arranged, that is, the included angle between the first driven slope 304 and the plugging direction of the circuit breaker is the same as the included angle between the second driven slope 306 and the pulling-out direction of the circuit breaker. Of course, the first driven slope 304 and the second driven slope 306 can also be arranged at different angles with the plugging direction of the circuit breaker.

[0072] As shown in Figure 8 and Figure 9 As shown, the cooperation structure between the locking piece 300 and the handle 200 of the embodiment, the locking cooperation portion 201 of the handle 200 is a groove structure radially recessed on the handle 200, and the locking portion 301 of the locking piece 300 is a boss structure protruding from the locking piece 300 to the handle 200. The locking structure between the locking piece 300 and the handle 200 is simple, the locking portion 301 can be extended into the locking cooperation portion 201 to stably lock the handle 200, and the locking portion 301 can quickly exit the locking cooperation portion 201 to release the locking between the locking piece 300 and the handle 200.

[0073] Preferably, the blocking portion 202 of the handle 200 is a boss structure radially protruding from the handle 200, and the blocking portion 202 and the locking cooperation portion 201 are adjacently arranged along the direction of the handle 200 rotating to the closed position, so that when the handle 200 is located at the closed position, the blocking portion 202 is located on the path of the locking portion 301 moving to the second position, so that the limiting portion 303 cannot be retracted into the anti-pulling hole 101. The locking portion 301 can cooperate with the locking cooperation portion 201 to lock the handle 200 at the open position, and can cooperate with the blocking portion 202 to block the locking piece 300 from retracting into the shell 100, thereby simplifying the structure of the locking piece 300.

[0074] Specifically, the blocking part 202 is provided with a sliding arc surface which is in sliding cooperation with the locking part 301 and is arranged along the rotating direction of the handle 200, so as to reduce the friction resistance between the blocking part 202 and the locking part 301 and facilitate the opening and closing operation of the handle 200.

[0075] Further, the locking member 300 is provided with an avoiding groove 302 which is adjacent to the locking part 301 and is used for avoiding the blocking part 202 when the locking part 301 is locked in the locking cooperation part 201, so as to facilitate the compact arrangement of the locking member 300 and the handle 200.

[0076] As shown in Figure 10 and Figure 11 , one end of the locking member 300 is upwardly protruded and provided with the locking part 301, the other end of the locking member 300 is downwardly protruded and provided with the limiting part 303, and the middle part of the locking member 300 is horizontally protruded and provided with a connecting platform 307. The elastic member 310 is preferably a compression spring and is connected to the connecting platform 307 at one end. Of course, the elastic member 310 can also be a tension spring, a leaf spring or a torsion spring, etc.

[0077] As shown in Figure 8 and Figure 9 , the locking structure of the plug-in circuit breaker of the embodiment further comprises a pulling device 400 which is rotationally connected to the operating end 102 of the housing 100 and can rotate between a retracted position and an open position, and the pulling device 400 is used to drive the handle 200 which is located at the closed position to rotate to the open position when the pulling device 400 rotates from the retracted position to the open position. Preferably, when the pulling device 400 is located at the retracted position, the pulling device 400 is in close contact with the operating end 102 or is accommodated in the accommodating groove on the operating end 102, and when the pulling device 400 is located at the open position, it is perpendicular to the plane on which the operating end 102 is located, so as to facilitate the pulling operation.

[0078] As shown in Figure 8 , the pulling device 400 is located at the retracted position and the handle 200 is located at the closed position; when it is needed to pull out the circuit breaker, the pulling device 400 is rotated to the open position (for example, counterclockwise rotation by 90°), as shown in Figure 9 , the pulling device 400 drives the handle 200 to rotate counterclockwise to the open position, at this time, the blocking part 202 of the handle 200 no longer blocks the locking part 301 of the locking member 300, that is, the circuit breaker is in a pull-out state. The pulling device 400 can be used not only for the pull-out operation of the circuit breaker, but also for driving the handle 200 to remove the blocking of the handle 200 to the locking member 300, so as to improve the convenience and safety of use.

[0079] Exemplarily, the pulling device 400 of the embodiment comprises a driving part 401, the handle 200 comprises a driven part 203, the driven part 203 is located on the path of the driving part 401 moving from the retracted position to the open position, and the driving part 401 can push the driven part 203 to drive the handle 200 to rotate to the open position during the process of the pulling device 400 rotating to the open position.

[0080] It should be noted that, in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0081] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. Plug-in circuit breaker comprising a housing (100), a handle (200), an operating mechanism (500), an electromagnetic system (510) and a thermal system (600) for driving the operating mechanism (500) to trip, an arc extinguishing device (700), a first terminal (800), a second terminal (810), a movable contact (820) and a stationary contact (830), the operating mechanism (500) being connected between the handle (200) and the movable contact (820), characterized in that: The handle (200) is arranged at the operating end (102) of the housing (100), The first terminal (800) and the second terminal (810) are arranged at the terminal end (103) of the housing (100) away from the operating end (102); The handle (200), the electromagnetic system (510), the static contact (830) and the first terminal (800) are sequentially arranged along a first direction, The thermal system (600) is at least partially arranged along the first direction with the second terminal (810), The first terminal (800) and the second terminal (810) are sequentially arranged along a second direction, the operating mechanism (500) is located on one side of the handle (200) and the electromagnetic system (510) along the second direction, the operating mechanism (500) is at least partially located between the electromagnetic system (510) and the thermal system (600) along the second direction, the arc extinguishing device (700) is located in an area surrounded by the electromagnetic system (510), the first terminal (800), the thermal system (600) and the static contact (830), and the first direction and the second direction are perpendicular to each other.

2. The plug-in circuit breaker of claim 1, wherein: The handle (200) is rotatably arranged at the operating end (102) of the housing (100), and the rotation axis of the handle (200) is arranged along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

3. The plug-in circuit breaker of claim 1, wherein: The moving direction of the moving iron core of the electromagnetic system (510) is arranged along the second direction.

4. The plug-in circuit breaker of claim 1, wherein: Further comprising a locking structure, the electromagnetic system (510) and the locking member (300) of the locking structure are sequentially arranged along the third direction.

5. The plug-in circuit breaker of claim 1, wherein: The arc extinguishing device (700) comprises an arc extinguishing chamber, and the arc extinguishing chamber is at least partially located between the first terminal (800) and the second terminal (810) along the second direction.

6. The plug-in circuit breaker of claim 1, wherein: The arc extinguishing device (700) comprises a first arc extinguishing chamber (710) and a second arc extinguishing chamber (720), the first arc extinguishing chamber (710) is located between the electromagnetic system (510) and the first terminal (800) along the first direction, and is located on the side of the static contact (830) away from the moving contact (820) along the second direction, the first arc extinguishing chamber (710) comprises a plurality of first arc extinguishing fins (711) arranged at intervals, the second arc extinguishing chamber (720) is located between the first terminal (800) and the second terminal (810) along the second direction, the second arc extinguishing chamber (720) comprises a plurality of second arc extinguishing fins (721) arranged at intervals, and the first arc extinguishing fins (711) and the second arc extinguishing fins (721) are arranged at an angle.

7. The plug-in circuit breaker of claim 6, wherein: The second arc extinguishing fins (721) are arranged at an angle towards the moving contact (820) close to the breaking position.

8. The plug-in circuit breaker of claim 6 or 7, wherein: The first arc extinguishing fins (711) are arranged perpendicular to the first direction.

9. The plug-in circuit breaker of claim 7, wherein: The arc extinguishing device (700) further comprises an arc striking member (730), and the arc striking member (730) is located between the first arc extinguishing chamber (710) and the second arc extinguishing chamber (720).

10. The plug-in circuit breaker of claim 9, wherein: The arc striking piece (730) is a V-shaped structure, and an opening is arranged towards the first connecting terminal (800). One end of the arc striking piece (730) is parallel to the first arc extinguishing grid (711) near the first arc extinguishing chamber (710), and the other end of the arc striking piece (730) is parallel to the second arc extinguishing grid (721) near the second arc extinguishing chamber (720).

11. The plug-in circuit breaker of claim 5 or 6, wherein: The static contact (830) comprises a static contact plate (831) electrically connected with the electromagnetic system (510) and a static contact point (832) arranged on the static contact plate (831). One end of the static contact plate (831) provided with the static contact point (832) is bent in a direction away from the moving contact (820) and provided with an arc striking corner (833). The electromagnetic system (510) is electrically connected with the first connecting terminal (800).

12. The plug-in circuit breaker of claim 5 or 6, wherein: The thermal system (600) comprises a bimetallic strip (610), an arc striking piece (620) and a conductive sheet (630). One end of the bimetallic strip (610) is connected with one end of the arc striking piece (620), and the bimetallic strip (610) is connected with the second connecting terminal (810) through the conductive sheet (630). The other end of the bimetallic strip (610) is located on a side of the moving contact (820) away from the static contact (830). The middle part of the arc striking piece (620) is provided with an arc striking part (621) protruding towards the moving contact (820) near the breaking position. The other end of the arc striking piece (620) is arranged parallel to one side of the arc extinguishing device (700).

13. The plug-in circuit breaker of claims 1 or 6, wherein: Part of the bimetallic strip (610) of the thermal system (600) is located between the first connecting terminal (800) and the second connecting terminal (810) in the second direction. The other part of the bimetallic strip (610) of the thermal system (600) and the second connecting terminal (810) are arranged in sequence in the first direction.

14. The plug-in circuit breaker of claims 1 or 5, wherein: Part of the bimetallic strip (610) of the thermal system (600) is located on a side of the second connecting terminal (810) away from the first connecting terminal (800) in the second direction. The other part of the bimetallic strip (610) of the thermal system (600) and the second connecting terminal (810) are arranged in sequence in the first direction.

15. The plug-in circuit breaker of claim 1, wherein: The first connecting terminal (800) and the second connecting terminal (810) are both elastic clamping structures. The connecting terminal (103) is provided with a first connecting hole (104) corresponding to the first connecting terminal (800) and a second connecting hole (105) corresponding to the second connecting terminal (810).

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