Locking structure of plug-in circuit breaker and plug-in circuit breaker

Abstract

The locking structure of the plug-in circuit breaker comprises a handle, a locking piece and an elastic piece, and the handle comprises a locking matching part and a blocking part; the locking piece comprises a locking part and a limiting part; when the handle is located at the switching-on position, the blocking part blocks the locking piece from moving towards the second position; when the handle is located at the opening position, the locking piece is located at the first position where the limiting part extends out of the anti-pulling hole and can move towards the second position under stress, and when the locking piece is stressed to overcome the acting force of the elastic piece to move to the second position, the locking part and the locking matching part are matched in a locking mode to prevent the handle from rotating towards the closing position. The utility model discloses a plug type circuit breaker which comprises a locking structure of the plug type circuit breaker. According to the locking structure of the plug-in circuit breaker and the plug-in circuit breaker provided by the utility model, the handle at the closing position prevents the locking piece from retracting into the shell, and the locking piece is stressed to retract into the shell to lock the handle at the opening position in the plugging process of the circuit breaker, so that the hot plugging of the circuit breaker cannot be realized before or during or after the plugging, and the safety of the plug-in circuit breaker is ensured. And the safety is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical apparatus field, concretely relates to a locking structure of plug -in circuit breaker and plug -in circuit breaker. BACKGROUND

[0002] Plug -in circuit breaker needs to be installed into meter box or cabinet and is used, when installing and overhauling circuit breaker, often have electric shock accident caused by not correct on -off, for example, circuit breaker installs or dismounts under the closing state, can lead to electric shock accident etc.

[0003] In addition, the locking structure of the existing plug-in circuit breaker is usually provided with a locking member for limiting cooperation with the meter box or the cabinet and for locking the handle to realize that the circuit breaker cannot be plugged and disassembled when closing, and usually needs to be provided with an unlocking member for releasing the limiting cooperation of the locking member with the meter box or the cabinet to realize that the circuit breaker can be plugged and disassembled when opening, resulting in a complex structure. In addition, the locking structure of the existing locking member for locking the handle also has problems such as complex structure, unreliable locking and unlocking.

[0004] In addition, the existing plug-in circuit breaker has the problems of loose layout structure and not compact, resulting in an excessively large size of the circuit breaker, but the plug-in circuit breaker needs to be frequently plugged and operated, and the large-size circuit breaker causes great inconvenience to use. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming at least one defect of the prior art, and provides a locking structure of plug-in circuit breaker and plug-in circuit breaker.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] The locking structure of the plug-in circuit breaker, the shell of the circuit breaker is provided with an anti-plugging hole, and the locking structure comprises

[0008] The handle is used for driving the circuit breaker to open and close, and the handle is rotatably arranged at the operating end of the shell and can rotate between the closing position and the opening position.

[0009] The locking member is slidably arranged in the shell and can move between the first position and the second position.

[0010] The elastic member is connected with the locking member and is used for driving the locking member to move to the first position.

[0011] When the handle is located at the closing position, the blocking portion blocks the movement of the locking member from the first position to the second position.

[0012] When the handle is in the open position, the locking member is in the first position of the limiting portion and can be moved to the second position under force, and when the locking member is moved to the second position under force against the force of the elastic member, the locking portion and the locking fitting portion are locked and fitted to block the rotation of the handle from the open position to the closed position.

[0013] Optionally, the limiting portion is provided with a first driven inclined surface, a fitting surface and a second driven inclined surface connected in sequence, the first driven inclined surface and the second driven inclined surface are respectively arranged at an angle with the insertion and extraction direction of the circuit breaker, and the fitting surface can limit the locking member in the second position under force.

[0014] Optionally, the fitting surface is a plane parallel to the insertion and extraction direction of the circuit breaker.

[0015] Optionally, the locking fitting portion is a groove structure radially recessed on the handle, and the locking portion is a boss structure protruding from the locking member to the handle.

[0016] Optionally, the blocking portion is a boss structure radially protruding from the handle, and the blocking portion and the locking fitting portion are adjacently arranged in the direction of rotation of the handle to the closed position, and the blocking portion is located in the path of movement of the locking portion to the second position when the handle is in the closed position.

[0017] Optionally, the locking member is provided with an avoidance groove adjacent to the locking portion, and the avoidance groove is used to avoid the blocking portion when the locking portion is locked in the locking fitting portion.

[0018] Optionally, the insertion and extraction direction of the circuit breaker, the sliding direction of the locking member and the rotation axis direction of the handle are perpendicular to each other.

[0019] Optionally, it further comprises a pulling device, the pulling device is rotationally connected to the operation end of the shell, the pulling device can rotate between the retracted position and the open position, and the pulling device is used to drive the handle in the closed position to rotate to the open position when the pulling device rotates from the retracted position to the open position.

[0020] The plug-in circuit breaker comprises the locking structure of any one of the plug-in circuit breakers.

[0021] Optionally, it further comprises 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 of the locking structure and the moving contact, and the first wiring terminal and the second wiring terminal are arranged at the wiring end of the shell away from the operation end.

[0022] The handle, the electromagnetic system, the static contact and the first terminal are arranged in sequence along a first direction, the thermal system is arranged at least partially along the first direction with the second terminal, the first terminal and the second terminal are arranged in sequence along a second direction, 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 electromagnetic system and the locking part of the locking structure are arranged in sequence along a third direction, the arc extinguishing device is located in an area surrounded by the electromagnetic system, the first terminal, the thermal system and the static contact, and the first direction, the second direction and the third direction are perpendicular to each other.

[0023] Optionally, the moving direction of the moving iron core of the electromagnetic system is arranged along the second direction.

[0024] 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 thermal system 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.

[0025] Optionally, the first arc extinguishing fins are arranged perpendicularly to the first direction, and the second arc extinguishing fins are arranged obliquely to the direction of the moving contact close to the breaking position.

[0026] Optionally, the arc extinguishing device further comprises an arc striking part, and the arc striking part is located between the first arc extinguishing chamber and the second arc extinguishing chamber.

[0027] Optionally, the arc striking part is in a V-shaped structure, the opening of the V-shaped structure is arranged to face the first terminal, one end of the arc striking part close to the first arc extinguishing chamber is parallel to the first arc extinguishing fins, and the other end of the arc striking part close to the second arc extinguishing chamber is parallel to the second arc extinguishing fins.

[0028] Optionally, the static contact comprises a static contact plate 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 to form an arc striking corner in the direction of the first arc extinguishing chamber.

[0029] Optionally, the thermal system comprises a bimetallic strip, an arc attracting part and a conductive sheet, one end of the bimetallic strip is connected with one end of the arc attracting part, and the bimetallic strip is connected with the second terminal through the conductive sheet, 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 attracting part is provided with an arc attracting part protruding towards the moving contact close to the breaking position, and the other end of the arc attracting part is arranged parallel to one side of the second arc extinguishing chamber.

[0030] Optionally, a part of the thermal system is located between the first terminal and the second terminal in the second direction, and another part of the thermal system and the second terminal are arranged in sequence in the first direction; the terminal is provided with a first terminal hole corresponding to the first terminal and a second terminal hole corresponding to the second terminal.

[0031] The locking structure of the plug-in circuit breaker and the plug-in circuit breaker of the utility model, through the handle blocking locking piece retracts the shell in the closing position, and the locking piece retracts the shell to lock the handle in the opening position in the circuit breaker plug-in process, realize that the circuit breaker cannot be plugged in with electricity before, during or after plugging, and ensure safety.

[0032] In addition, the stress part of the locking piece is switched between the inclined plane and the matching surface, realizing that the locking piece automatically extends or retracts the shell in the circuit breaker plug-in process, without additional unlocking piece, simplifying the structure.

[0033] In addition, the locking structure between the locking piece and the handle is simple, the locking part can extend into the locking matching part to stabilize the locking handle, and the locking part can also quickly exit the locking matching part to release the locking between the locking piece and the handle.

[0034] In addition, the locking part can be matched with the locking matching part to lock the handle in the opening position, and can be matched with the blocking part to block the locking piece from retracting the shell, simplifying the structure of the locking piece.

[0035] In addition, by moving the operating mechanism upward to the upper side of the handle and the electromagnetic system, the electromagnetic system, the static contact and the moving contact are offset and arranged towards the handle, space is saved, more space is provided for the arc extinguishing device, the arc extinguishing capacity can be improved, the layout is more compact and reasonable, the size of the circuit breaker in the first direction is reduced, the circuit breaker is more compact and miniaturized, and the plug-in operation of the circuit breaker is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is the structure schematic diagram of the circuit breaker in the opening state of the utility model;

[0037] 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;

[0038] 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;

[0039] Figure 4 It is the sectional view of the circuit breaker in the state of plugging and unable to close of the utility model;

[0040] Figure 5 It is the view of the circuit breaker in the state of plugging and unable to close of the utility model;

[0041] Figure 6 is the sectional view of the circuit breaker in the installation final state of the utility model;

[0042] Figure 7 is the view of the utility model in the installation final state;

[0043] Figure 8 is the sectional view of the circuit breaker in the open state of the utility model;

[0044] Figure 9 is the sectional view of the circuit breaker in the closed state of the utility model;

[0045] Figure 10 is the perspective view of the locking member of the utility model;

[0046] Figure 11 is the view of the locking member of the utility model.

[0047] 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 member 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 member 310; Pulling device 400; Driving part 401; Operating mechanism 500; Electromagnetic system 510; Thermal system 600; Bimetallic strip 610; Soft connection 611; Arc-attracting member 620; Arc-attracting part 621; Conductive sheet 630; Arc extinguishing device 700; First arc extinguishing chamber 710; First arc extinguishing sheet 711; First side plate 712; Second arc extinguishing chamber 720; Second arc extinguishing sheet 721; Second side plate 722; Arc-attracting member 730; 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

[0048] The following embodiments are further illustrated by the accompanying drawings, which further illustrate the locking structure of the plug-in circuit breaker and the specific implementation of the plug-in circuit breaker of the utility model. The locking structure of the plug-in circuit breaker and the plug-in circuit breaker of the utility model are not limited to the description of the following embodiments.

[0049] As Figure 6 and Figure 7As shown, the plug-in circuit breaker can be plug-in installed in a meter box or a cabinet, and in the example, the plug-in circuit breaker of the present embodiment is plug-in installed in a meter box, which includes an openable and closable cover plate 910 and a positioning plate 900 for guiding and positioning the circuit breaker. The circuit breaker is slidably 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 a plug-in or plug-out state and a final installation state, and the circuit breaker includes a housing 100, which is provided with a plug-out prevention hole 101 on the side facing the positioning plate 900, and the operating end 102 of the housing 100 is provided with a positioning step 106. The cover plate 910 is in a closed state, covering the operating end 102 of the housing 100 and abutting against the positioning step 106.

[0050] As shown in Figure 1 , Figure 2 and Figure 3 , the plug-in circuit breaker of the present embodiment includes a locking structure for cooperating with the meter box or the cabinet. The locking structure includes a handle 200 for driving the circuit breaker to open and close, a locking member 300 slidably arranged in the housing 100, and an elastic member 310 connected with the locking member 300, the handle 200 is rotatably arranged on the operating end 102 of the housing 100 and can be rotated between a closed position and an open position, the handle 200 includes a locking cooperation part 201 and a blocking part 202; the locking member 300 can move between a first position and a second position, the locking member 300 includes a locking part 301 for locking cooperation with the locking cooperation part 201 and a limiting part 303 for cooperating with the plug-out prevention hole 101, the limiting part 303 can extend out of or retract into the plug-out prevention hole 101, when the locking member 300 is in the first position, the limiting part 303 extends out of the plug-out prevention hole 101, and when the locking member 300 is in the second position, the limiting part 303 retracts into the plug-out prevention hole 101, the elastic member 310 is used to drive the locking member 300 to move to the first position, and the locking member 300 can move to the second position against the force of the elastic member 310, and the force of the locking member 300 can come from hand pressing, or the pressure of the positioning plate 900, or the driving of other transmission mechanisms.

[0051] Wherein, when the handle 200 is in the closed position, the blocking part 202 blocks the locking member 300 from moving from the first position to the second position, so that the limiting part 303 cannot retract into the plug-out prevention hole 101, and the circuit breaker in the closed state cannot be inserted or plugged out;

[0052] When the handle 200 is in the open position, the blocking part 202 is turned to a position away from the locking member 300, at this time the locking matching part 201 corresponds to the locking part 301 of the locking member 300, the locking member 300 is in the first position where the limiting part 303 extends out of the anti-pulling hole 101 and can be forced to move to the second position, when the locking member 300 is forced to move to the second position against the force of the elastic member 310, the limiting part 303 is retracted into the anti-pulling hole 101, and the locking part 301 and the locking matching part 201 are locked and matched to prevent the handle 200 from rotating from the open position to the closed position; after the force on the locking member 300 is removed, the elastic member 310 drives 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 and the locking matching part 201 are unlocked and matched, so that the handle 200 can rotate from the open position to the closed position.

[0053] As shown in Figures 3-5 , when the circuit breaker is in the state of being inserted or pulled out, the positioning plate 900 can drive the limiting part 303 to retract into the anti-pulling hole 101, and make the locking part 301 of the locking member 300 and the locking matching part 201 locked and matched, so that the handle 200 cannot rotate to the closed position; as shown in Figures 6-7 , when the circuit breaker is in the final installation state, i.e. after the circuit breaker is installed in place, the elastic member 310 can drive the locking member 300, so that the limiting part 303 extends out of the anti-pulling hole 101 and is limited and matched with the positioning plate 900, so that the locking part 301 of the locking member 300 and the locking matching part 201 are unlocked and matched, at this time the handle 200 can rotate from the open position to the closed position to perform the closing operation.

[0054] The locking structure of the plug-in circuit breaker and the plug-in circuit breaker of the embodiment, by blocking the locking member 300 from retracting into the shell 100 when the handle 200 is in the closed position, and forcing the locking member 300 to retract into the shell 100 to lock the handle 200 in the open position during the insertion and pulling out of the circuit breaker, realize that the circuit breaker cannot be inserted or pulled out under voltage before, during or after the insertion and pulling out, and ensure safety.

[0055] Preferably, the insertion and pulling out direction of the circuit breaker, the sliding direction of the locking member 300 and the rotating axis direction of the handle 200 are perpendicular to each other. Simplify the structure and action relationship, and also facilitate compact and reasonable arrangement. Of course, the insertion and pulling out direction of the circuit breaker, the sliding direction of the locking member 300 and the rotating axis direction of the handle 200 can also be arranged at other angles.

[0056] As shown in Figure 3 , Figure 5 , and Figure 7As shown, the mating structure between the positioning plate 900 and the locking member 300 in this embodiment includes a first activated inclined surface 304, a mating surface 305, and a second activated inclined surface 306 connected in sequence on the limiting part 303 of the locking member 300. The first activated inclined surface 304 and the second activated inclined surface 306 are respectively set at an angle to the insertion and removal direction of the circuit breaker, that is, the first activated inclined surface 304 and the second activated inclined surface 306 are not set perpendicular to the insertion and removal direction of the circuit breaker. When the mating surface 305 is subjected to force, it limits the locking member 300 to a second position. The positioning plate 900 is provided with a limiting hole 901.

[0057] like Figures 2-5 As shown, when the circuit breaker is in the inserted state, the first activated inclined surface 304 can interfere with the side edge of the positioning plate 900 in the thickness direction to drive the locking member 300, causing the limiting part 303 to retract into the anti-pullout hole 101, and the positioning plate 900 abuts against the mating surface 305, so that the limiting part 303 cannot extend out of the anti-pullout hole 101; Figures 6-7 As shown, when the circuit breaker is in the final installation state, the limiting part 303 is limited within the limiting hole 901; when the circuit breaker is in the removal state, the second activated inclined surface 306 can interfere with one side wall of the limiting hole 901 to drive the locking member 300, causing the limiting part 303 to retract into the anti-removal hole 101, and the positioning plate 900 abuts against the mating surface 305, keeping the limiting part 303 from extending out of the anti-removal hole 101. The force-bearing part of the locking member 300 switches between the inclined surface and the mating surface 305, realizing that the locking member 300 automatically extends or retracts into the housing 100 during the circuit breaker insertion and removal process, without the need for an additional unlocking member, simplifying the structure.

[0058] Preferably, the mating surface 305 is a plane parallel to the insertion and removal direction of the circuit breaker. This structure is simple and easy to construct. Of course, the mating surface 305 can also be an arc surface or other structures. The first activated inclined surface 304 and the second activated inclined surface 306 are symmetrically arranged, that is, the angle between the first activated inclined surface 304 and the insertion direction of the circuit breaker and the angle between the second activated inclined surface 306 and the removal direction of the circuit breaker are the same. Of course, the first activated inclined surface 304 and the second activated inclined surface 306 can also be arranged at different angles to the insertion and removal directions of the circuit breaker.

[0059] like Figure 8 and Figure 9As shown, the locking structure between the locking member 300 and the handle 200 in this embodiment has the following characteristics: the locking engagement portion 201 of the handle 200 is a radially recessed groove structure, and the locking portion 301 of the locking member 300 is a protrusion structure protruding from the locking member 300 toward the handle 200. The locking structure between the locking member 300 and the handle 200 is simple. The locking portion 301 can extend into the locking engagement portion 201 to stably lock the handle 200, and it is also convenient for the locking portion 301 to quickly exit the locking engagement portion 201 to release the lock between the locking member 300 and the handle 200.

[0060] Preferably, the blocking part 202 of the handle 200 is a boss structure that protrudes radially from the handle 200. The blocking part 202 and the locking engagement part 201 are arranged adjacent to each other in the direction in which the handle 200 rotates towards the closed position. When the handle 200 is in the closed position, the blocking part 202 is located on the path of the locking part 301 moving towards the second position, preventing the limiting part 303 from retracting the anti-pull hole 101. The locking part 301 can cooperate with the locking engagement part 201 to lock the handle 200 in the open position, and can also cooperate with the blocking part 202 to prevent the locking part 300 from retracting into the outer shell 100, simplifying the structure of the locking part 300.

[0061] Specifically, the blocking part 202 is provided with a sliding arc surface that slides in cooperation with the locking part 301. The sliding arc surface is arranged along the rotation direction of the handle 200 to reduce the frictional resistance between the blocking part 202 and the locking part 301, so as to facilitate the opening and closing operation of the handle 200.

[0062] Furthermore, the locking member 300 is provided with a relief groove 302 adjacent to the locking part 301. The relief groove 302 is used to avoid the blocking part 202 when the locking part 301 is locked in the locking engagement part 201. This facilitates a compact arrangement of the locking member 300 and the handle 200.

[0063] For example, such as Figure 10 and Figure 11 As shown, one end of the locking member 300 protrudes upward to form the locking portion 301, and the other end of the locking member 300 protrudes downward to form the limiting portion 303. A connecting platform 307 protrudes horizontally from the middle of the locking member 300. The elastic member 310 is preferably a compression spring, with one end connected to the connecting platform 307. Of course, the elastic member 310 can also be a tension spring, leaf spring, or torsion spring, etc.

[0064] like Figure 8 and Figure 9As shown, the locking structure of the plug-in circuit breaker in this embodiment further includes a pull-out device 400. The pull-out device 400 is rotatably connected to the operating end 102 of the housing 100. The pull-out device 400 can rotate between a retracted position and an open position, and when rotating from the retracted position to the open position, the pull-out device 400 drives the handle 200, which is in the closed position, to rotate to the open position. Preferably, when the pull-out device 400 is in the retracted position, it is close to the operating end 102 or retracted into the receiving groove on the operating end 102. When the pull-out device 400 is in the open position, it is perpendicular to the plane where the operating end 102 is located, facilitating the pull-out operation.

[0065] like Figure 8 As shown, the pulling device 400 is in the retracted position, and the handle 200 is in the closed position; when it is necessary to pull out the circuit breaker, rotate the pulling device 400 to the open position (e.g., rotate 90° counterclockwise), as shown. Figure 9 As shown, 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, meaning the circuit breaker is in a pull-out state. The pulling device 400 can be used for circuit breaker pulling operations, and can also release the blocking of the locking member 300 by the handle 200 by driving the handle 200, improving the convenience and safety of use.

[0066] For example, the pulling device 400 of this embodiment includes a driving part 401, and the handle 200 includes 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. During the rotation of the pulling device 400 to the open position, the driving part 401 can push against the driven part 203 to drive the handle 200 to rotate to the open position. As another embodiment, a boss can also be provided on the side wall near the handle 200 when the pulling device 400 is in the open position as the driving part 401. During the rotation of the pulling device 400 to the open position, the boss drives the handle 200 to rotate to the open position.

[0067] like Figure 1 and Figure 6As shown, the plug-in circuit breaker of this embodiment further includes 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 for connecting to the first busbar 920, a second terminal 810 for connecting to the second busbar 930, and cooperating moving contacts 820 and stationary contacts 830. The moving contacts 820 and stationary contacts 830 are electrically connected to the first terminal 800 and the second terminal 810, respectively. In this embodiment, the electromagnetic system 510 is electrically connected to the first terminal 800 and the stationary contact 830. Between 0 and 0, the thermal system 600 is electrically connected between the second terminal 810 and the moving contact 820, and the operating mechanism 500 is connected between the handle 200 of the locking structure and the moving contact 820. The handle 200 can drive the operating mechanism 500 to make the moving 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 there is a short circuit, and the thermal system 600 is used to trigger the operating mechanism 500 to trip when there is an overload. The first terminal 800 and the second terminal 810 are both located at the terminal 103 of the housing 100 away from the operating end 102.

[0068] The handle 200, electromagnetic system 510, stationary contact 830, and first terminal 800 are arranged sequentially 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 arranged sequentially along a second direction. The operating mechanism 500 is located on one side of the handle 200 and electromagnetic system 510 in the second direction. The operating mechanism 500 is at least partially located between the electromagnetic system 510 and thermal system 600 in the second direction. The electromagnetic system 510 and the locking member 300 of the locking structure are arranged sequentially along a third direction. The arc extinguishing device 700 is located within the area enclosed by the electromagnetic system 510, the second terminal 810, the thermal system 600, and the stationary contact 830. The first direction, the second direction, and the third direction are perpendicular to each other.

[0069] It should be noted that the first direction is Figure 1 The X direction in the diagram is also the insertion direction of the circuit breaker; the second direction is... Figure 1 The Y direction in the diagram is also the direction in which the locking element 300 retracts into the outer shell 100; the third direction is... Figure 1The direction perpendicular to the drawing is also the direction of the rotation axis of the handle 200. The operating mechanism 500 is existing technology and typically includes a linkage structure. The linkage structure usually includes a linkage, a lever, a latch and a release latch. The latch and release latch are rotatably mounted on the lever. The linkage connects the release latch and the handle 200. The moving contact is mounted on the lever. The handle 200 drives the moving contact 820 to contact or separate from the stationary contact 830 through the linkage structure. The electromagnetic system 510 and the thermal system 600 push the latch to rotate to release the latch and release latch, which can disengage the operating mechanism 500 and cause the moving contact 820 to separate from the stationary contact 830, thus achieving tripping protection. This will not be described in detail here.

[0070] In this embodiment of the plug-in circuit breaker, by moving the operating mechanism 500 above the handle 200 and the electromagnetic system 510, the electromagnetic system 510, the stationary contact 830 and the moving contact 820 are offset towards the handle 200, saving space and making more room for the arc extinguishing device 700, which can improve the arc extinguishing capability and make the layout more compact and reasonable. The size of the circuit breaker in the first direction is reduced, making the circuit breaker more compact and miniaturized, and facilitating the plug-in and plug-out operation of the circuit breaker.

[0071] In this embodiment, both the first terminal 800 and the second terminal 810 are elastic clip structures. The connection direction between the first terminal 800 and the first busbar 920 is set along the first direction, and the connection direction between the second terminal 810 and the second busbar 930 is set along the first direction. The terminal 103 is provided with a first wiring hole 104 corresponding to the first terminal 800 and a second wiring hole 105 corresponding to the second terminal 810. The first busbar 920 and the second busbar 930 are inserted into the housing 100 along the first direction and electrically connected to the first terminal 800 and the second terminal 810. The first busbar 920 and the second busbar 930 are respectively used to connect the power supply and the load.

[0072] Preferably, the direction of the driving mechanism 500 of the electromagnetic system 510 is set along the second direction, that is, the direction of movement of the moving iron core of the electromagnetic system 510. This vertical arrangement of the electromagnetic system 510 makes the layout more compact and further saves space. Of course, the direction of the driving mechanism 500 of the electromagnetic system 510 can also be set at an angle to the second direction.

[0073] It should be noted that the electromagnetic system 510 is existing technology, typically including a coil frame, a coil wound on the coil frame, a moving iron core and a stationary iron core arranged opposite each other, a push rod that moves synchronously with the moving iron core, and a return 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, it drives the moving iron core to engage with the stationary iron core. The push rod moves with the moving iron core to push the latch to rotate, causing the operating mechanism to unlock and release, thus realizing the circuit breaker's circuit breaking protection. This will not be elaborated further here. The direction in which the electromagnetic system 510 drives the operating mechanism 500 refers to the direction of movement of the push rod during the engagement of the moving iron core and the stationary iron core.

[0074] like Figure 1 and Figure 2 As shown, the arc-extinguishing device 700 of this embodiment includes 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 in a first direction, and on the side of the stationary contact 830 away from the moving contact 820 in a second direction. The first arc-extinguishing chamber 710 includes a plurality of first arc-extinguishing grid plates 711 arranged at intervals. The second arc-extinguishing chamber 720 is located between the first terminal 800 and the thermal system 600 in a second direction. The second arc-extinguishing chamber 720 includes a plurality of second arc-extinguishing grid plates 721 arranged at intervals. The first arc-extinguishing grid plates 711 and the second arc-extinguishing grid plates 721 are arranged at an angle. The angled arrangement of the first arc-extinguishing chamber 710 and the second arc-extinguishing chamber 720 facilitates the arrangement of more arc-extinguishing grid plates in a limited space, thereby improving the breaking capacity.

[0075] In this embodiment, the first arc-extinguishing chamber 710 and the second arc-extinguishing chamber 720 are separately arranged. The first arc-extinguishing chamber 710 further includes two first side plates 712, which are arranged opposite each other at a distance along a third direction, and the first arc-extinguishing grid plate 711 is disposed between the two first side plates 712. The second arc-extinguishing chamber 720 further includes two second side plates 722, which are arranged opposite each other at a distance along a third direction, and the second arc-extinguishing grid plate 721 is disposed between the two second side plates 722. The side plates and the arc-extinguishing grid plate can be designed in conventional shapes, which is highly versatile and easy to manufacture.

[0076] Of course, as another embodiment, the first arc-extinguishing chamber 710 and the second arc-extinguishing chamber 720 can also be integrally arranged. The arc-extinguishing device 700 also includes two third side plates shared by the first arc-extinguishing chamber 710 and the second arc-extinguishing chamber 720. The two third side plates are arranged opposite each other at a distance along a third direction, and the first arc-extinguishing grid plate 711 and the second arc-extinguishing grid plate 721 are respectively disposed between the two third side plates. As another embodiment, the arc-extinguishing device 700 can also include only a single large-sized arc-extinguishing chamber. The arc-extinguishing chamber is at least partially located between the first terminal 800 and the second terminal 810 in a second direction, and the arc-extinguishing chamber is arranged in an arc shape.

[0077] Preferably, the first arc-extinguishing grid plate 711 of the first arc-extinguishing chamber 710 is arranged perpendicular to the first direction, so that the first arc-extinguishing chamber 710 can be equipped with a larger number of arc-extinguishing grid plates, thereby improving the arc-extinguishing capability. The second arc-extinguishing grid plate 721 of the second arc-extinguishing chamber 720 is inclined towards the moving contact 820 near the breaking position, which is more conducive to the extinguishing of the arc and improves the arc-extinguishing effect.

[0078] Furthermore, the arc-extinguishing device 700 of this embodiment also includes an arc-initiating element 730, which is located between the first arc-extinguishing chamber 710 and the second arc-extinguishing chamber 720. The arc-initiating element 730 enables the electric arc to be rapidly transferred from the second arc-extinguishing chamber 720 into the first arc-extinguishing chamber 710.

[0079] Preferably, the arc-inducing element 730 has a V-shaped structure with its opening facing the first terminal 800. One end of the arc-inducing element 730 near the first arc-extinguishing chamber 710 is parallel to the first arc-extinguishing grid plate 711, and the other end of the arc-inducing element 730 near the second arc-extinguishing chamber 720 is parallel to the second arc-extinguishing grid plate 721.

[0080] In this embodiment, the stationary contact 830 includes a stationary contact plate 831 electrically connected to the electromagnetic system 510 and a stationary contact point 832 disposed on the stationary contact plate 831. The end of the stationary contact plate 831 with the stationary contact point 832 is bent towards the first arc-extinguishing chamber 710 and has an arc-inducing angle 833, which facilitates the rapid transfer of the electric arc on the stationary contact 830 to the first arc-extinguishing chamber 710.

[0081] Preferably, a portion of the thermal system 600 is located in the second direction between the first terminal 800 and the second terminal 810, and the other portion of the thermal system 600 and the second terminal (810) are arranged sequentially along the first direction.

[0082] 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-extinguishing chamber 720, facilitating the rapid transfer of the arc on the moving contact 820 to the second arc-extinguishing chamber 720. It should be noted that a part of the thermal system 600 refers to the other end of the bimetallic strip 610, and the other part of the thermal system 600 includes one end of the bimetallic strip 610, the conductive sheet 630, and the arc-quenching element 620.

[0083] When the moving contact 820 and the stationary contact 830 separate and an electric arc is generated, the electric arc on the stationary contact 830 enters the first arc-extinguishing chamber 710 along the arc-starting angle 83, and the electric arc on the moving contact 820 jumps to the arc-starting part 621 of the arc-starting member 620, and then moves along the arc-starting member 620 into the second arc-extinguishing chamber 720.

[0084] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0085] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A locking structure for a pluggable circuit breaker, wherein the circuit breaker housing (100) is provided with an anti-pull-out hole (101), characterized in that: The locking structure includes A handle (200) is used to drive the circuit breaker to open and close. The handle (200) is rotatably disposed on the operating end (102) of the housing (100) and can rotate between the closed position and the open position. The handle (200) includes a locking engagement part (201) and a blocking part (202). A locking member (300) is slidably disposed within the housing (100) and is movable between a first position and a second position. The locking member (300) includes a locking part (301) and a limiting part (303). When the locking member (300) is in the first position, the limiting part (303) extends out of the anti-pull hole (101), and when the locking member (300) is in the second position, the limiting part (303) retracts into the anti-pull hole (101). An elastic element (310) is connected to a locking element (300) and is used to drive the locking element (300) to move to a first position; When the handle (200) is in the closed position, the blocking part (202) blocks the locking member (300) from moving from the first position to the second position; When the handle (200) is in the open position, the locking member (300) is in the first position where the limiting part (303) extends out of the anti-pull hole (101) and can move to the second position under force. When the locking member (300) moves to the second position under force against the action of the elastic member (310), the locking part (301) and the locking engagement part (201) lock and engage to prevent the handle (200) from rotating from the open position to the closed position.

2. The locking structure of the plug-in circuit breaker according to claim 1, characterized in that: The limiting part (303) is provided with a first active inclined surface (304), a mating surface (305), and a second active inclined surface (306) connected in sequence. The first active inclined surface (304) and the second active inclined surface (306) are respectively set at an angle to the insertion and removal direction of the circuit breaker. When the mating surface (305) is subjected to force, it can limit the locking member (300) to the second position.

3. The locking structure of the pluggable circuit breaker according to claim 2, characterized in that: The mating surface (305) is a plane parallel to the insertion and removal direction of the circuit breaker.

4. The locking structure of the pluggable circuit breaker according to claim 1, characterized in that: The locking engagement part (201) is a groove structure that is radially recessed in the handle (200), and the locking part (301) is a boss structure that is protruded from the locking member (300) toward the handle (200).

5. The locking structure of the pluggable circuit breaker according to claim 4, characterized in that: The blocking part (202) is a boss structure that is radially protruding from the handle (200). The blocking part (202) and the locking engagement part (201) are arranged adjacent to each other in the direction of rotation of the handle (200) toward the closed position. When the handle (200) is in the closed position, the blocking part (202) is located on the path of the locking part (301) moving toward the second position.

6. The locking structure of the pluggable circuit breaker according to claim 5, characterized in that: The locking member (300) is provided with a relief groove (302) adjacent to the locking part (301), the relief groove (302) is used to avoid the blocking part (202) when the locking part (301) is locked in the locking mating part (201).

7. The locking structure of the plug-in circuit breaker according to claim 1, characterized in that: The insertion and removal 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.

8. The locking structure of the pluggable circuit breaker according to claim 1, characterized in that: It also includes a pull-out device (400) which is rotatably connected to the operating end (102) of the housing (100). The pull-out device (400) is rotatable between a retracted position and an open position, and the pull-out device (400) is used to drive the handle (200) located in the closed position to rotate to the open position when rotating from the retracted position to the open position.

9. A pluggable circuit breaker, characterized in that: Includes the locking structure of the plug-in circuit breaker as described in any one of claims 1-8.

10. The pluggable circuit breaker according to claim 9, characterized in that: It also includes 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 moving contact (820) and a stationary contact (830). The operating mechanism (500) is connected between the handle (200) of the locking structure and the moving contact (820). The first terminal (800) and the second terminal (810) are both located at the terminal (103) of the housing (100) away from the operating end (102). The handle (200), electromagnetic system (510), stationary contact (830), and first terminal (800) are arranged sequentially 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 arranged sequentially along a second direction. The operating mechanism (500) is located on one side of the handle (200) and electromagnetic system (510) in the second direction. The operating mechanism (500) is at least partially located between the electromagnetic system (510) and thermal system (600) in the second direction. The electromagnetic system (510) and the locking member (300) of the locking structure are arranged sequentially along a third direction. The arc extinguishing device (700) is located within the area enclosed by the electromagnetic system (510), first terminal (800), thermal system (600), and stationary contact (830). The first direction, second direction, and third direction are perpendicular to each other.

11. The pluggable circuit breaker according to claim 10, characterized in that: The moving iron core of the electromagnetic system (510) is set to move in the second direction.

12. The pluggable circuit breaker according to claim 10, characterized in that: The arc extinguishing device (700) includes 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) in a first direction, and is located on the side of the stationary contact (830) away from the moving contact (820) in a second direction. The first arc extinguishing chamber (710) includes a plurality of first arc extinguishing grid plates (711) arranged at intervals. The second arc extinguishing chamber (720) is located between the first terminal (800) and the thermal system (600) in a second direction. The second arc extinguishing chamber (720) includes a plurality of second arc extinguishing grid plates (721) arranged at intervals. The first arc extinguishing grid plates (711) and the second arc extinguishing grid plates (721) are arranged at an angle.

13. The pluggable circuit breaker according to claim 12, characterized in that: The first arc-extinguishing grid plate (711) is arranged perpendicular to the first direction; the second arc-extinguishing grid plate (721) is arranged inclined towards the moving contact (820) near the break position.

14. The pluggable circuit breaker according to claim 13, characterized in that: The arc extinguishing device (700) further includes an arc-initiating element (730), which is located between the first arc extinguishing chamber (710) and the second arc extinguishing chamber (720).

15. The pluggable circuit breaker according to claim 14, characterized in that: The arc-starting component (730) has a V-shaped structure with its opening facing the first terminal (800). One end of the arc-starting component (730) near the first arc-extinguishing chamber (710) is parallel to the first arc-extinguishing grid plate (711), and the other end of the arc-starting component (730) near the second arc-extinguishing chamber (720) is parallel to the second arc-extinguishing grid plate (721).

16. The pluggable circuit breaker according to claim 12, characterized in that: The stationary contact (830) includes a stationary contact plate (831) and a stationary contact point (832) disposed on the stationary contact plate (831). The end of the stationary contact plate (831) with the stationary contact point (832) is bent towards the first arc-extinguishing chamber (710) and has an arc-inducing angle (833).

17. The pluggable circuit breaker according to claim 12, characterized in that: 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) through 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). The middle part of the arc-quenching element (620) protrudes towards the moving contact (820) near the break position and is provided with an arc-quenching portion (621). The other end of the arc-quenching element (620) is arranged parallel to one side of the second arc-extinguishing chamber (720).

18. The pluggable circuit breaker according to claim 10, characterized in that: A portion of the thermal system (600) is located between the first terminal (800) and the second terminal (810) in a second direction, and the other portion of the thermal system (600) and the second terminal (810) are arranged sequentially along a first direction; the terminal (103) is provided with a first wiring hole (104) corresponding to the first terminal (800) and a second wiring hole (105) corresponding to the second terminal (810).

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