A molded case circuit breaker

Abstract

The application discloses a molded case circuit breaker, which comprises a shell, an operating mechanism, a contact assembly, an arc extinguishing assembly and a terminal assembly arranged in the shell, the shell comprises a base, a middle frame arranged on the base and a cover arranged on the middle frame, the operating mechanism comprises a handle and a rotating shaft block connected with the handle, the contact assembly comprises a static contact and a dynamic contact connected with the rotating shaft block, the arc extinguishing assembly comprises an arc extinguishing chamber, the terminal assembly comprises a wiring frame arranged on the base, a wiring slot arranged in the wiring frame and a screwing part arranged on the wiring frame, the operating mechanism further comprises a linkage frame arranged below the handle and connected with the handle, two mounting side frames arranged on both sides of the linkage frame and connected with the linkage frame in a rotating mode and a swing frame arranged between the two mounting side frames. The application has a reasonable structure design, the operating mechanism and the terminal assembly are improved, the micro switch indicating mechanism is optimized, and the terminal side is better protected.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, and more specifically, to a molded case circuit breaker. Background Technology

[0002] Existing technology CN120767169A discloses a molded case circuit breaker, including a housing, an electric operating mechanism disposed within the housing, the electric operating mechanism including a moving contact actuation assembly with a rotary block and a lever, a sliding block slidably disposed on the housing and capable of driving the lever to move, an operating shaft capable of driving the sliding block to slide and having an operating hole, and a motor reduction assembly capable of driving the operating shaft to rotate, the operating shaft being linked to a lever block, the sliding block being provided with a mating groove corresponding to the lever block, the rotation of the operating shaft driving the lever block to move in the mating groove, thereby driving the sliding block to slide, a cover plate slidably disposed on the housing to cover the operating hole, the housing also being provided with a rotary lock and a trip button located on one side of the rotary lock. This invention, by setting a locking micro switch, a manual micro switch, a first micro switch and a second micro switch, can realize signal feedback of manual operation state, rotary lock locking state, and current circuit breaker state.

[0003] The aforementioned patent application, being our company's prior application, mainly involves improvements to the micro switch indicator mechanism. As the product is updated and iterated, the R&D personnel have also made improvements to the operating mechanism, contact assembly, and terminal assembly. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and proposes a molded case circuit breaker with a reasonable structural design. Through improvements to the operating mechanism and terminal components, the micro switch indicating mechanism is optimized, and it provides better protection for the terminal side.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A molded case circuit breaker includes a housing and an operating mechanism, a contact assembly, an arc-extinguishing assembly, and a terminal assembly disposed within the housing. The housing includes a base, a central frame disposed on the base, and a cover disposed on the central frame. The operating mechanism includes a handle and a rotating shaft block linked to the handle. The contact assembly includes a stationary contact and a moving contact connected to the rotating shaft block. The arc-extinguishing assembly includes an arc-extinguishing chamber. The terminal assembly includes a terminal frame disposed on the base, a terminal slot disposed within the terminal frame, and a tightening member disposed on the terminal frame. The operating mechanism further includes a linkage frame disposed below the handle and linked to the handle, two mounting side frames disposed on both sides of the linkage frame and rotatably connected to the linkage frame, a swing frame disposed between the two mounting side frames, an elastic member connecting the swing frame and the linkage frame, and a shaft rotatably passing through the two mounting side frames and linked to the swing frame. The rotating shaft block is disposed below the swing frame and linked to the swing frame. A toggle block is linkedly disposed on the shaft block extending out of one of the mounting side frames. A first micro switch is provided on one side. The rotation of the shaft drives the lever to move, so that the lever abuts or disengages with the first micro switch. Abutting part is provided on the rotating shaft block. A second micro switch is provided on one side of the abutting part. The rotation of the rotating shaft block drives the abutting part to move, so that the abutting part abuts or disengages with the second micro switch. The arc-extinguishing chamber includes a mounting base block. A protective cover is provided on the wiring frame at the position corresponding to the tightening part. The protective cover includes a mounting part positioned on the top of the wiring frame, a cover part provided on the mounting part and covering the tightening part, a heat dissipation plate provided on the mounting part and located between the cover part and the arc-extinguishing chamber, and a connecting plate extending downward below the heat dissipation plate and docking with the mounting base block. A connecting block is provided on the connecting plate and docking with the mounting base block. The mounting base block and the connecting plate form a complete shield for the wiring groove. The heat dissipation plate is provided with vent holes corresponding to the tightening part. A terminal cover is installed on the housing to cover the wiring frame. The terminal cover is provided with heat dissipation holes at the position corresponding to the tightening part.

[0007] Preferably, the operating mechanism is located between the base and the middle frame, the handle is set through the middle frame in a direction away from the base, the mounting side frame is fixedly connected to the base, a first mounting plate is fixedly connected to the middle frame, a first micro switch is fixedly mounted on the middle frame through the first mounting plate, a second mounting plate is fixedly connected to the middle frame, and a second micro switch is fixedly mounted on the middle frame through the second mounting plate.

[0008] Preferably, the mounting side frame is provided with a receiving groove, the linkage frame has an insertion part that is inserted into the receiving groove and rotates with the receiving groove, the linkage frame has a pin integrally formed above the insertion part, the mounting side frame is provided with two crossbars above the receiving groove, the two crossbars are provided with protrusions facing opposite directions, and an insertion space is formed between the two protrusions for the pin and the insertion part to be inserted, the part of the shaft extending out of the mounting side frame is a flat connecting part, and the lever is provided with a slot adapted to the flat connecting part.

[0009] Preferably, the bottom of the wiring frame forms an arc-shaped segment, which is curved upward. The stationary contact includes a wiring segment located on the arc-shaped segment. The wiring segment has an arc shape that matches the arc-shaped segment. The opening of the wiring segment faces the wiring groove. A pressure plate is provided in the wiring groove. A tightening member is provided on the pressure plate and is threaded to the top of the wiring frame. The tightening member includes a riveting part located in the wiring groove. The pressure plate has a through hole. The pressure plate is sleeved on the riveting part through the through hole and riveted to the riveting part. The pressure plate is vertically limited by the riveting part. There is a gap between the through hole of the pressure plate and the outer periphery of the riveting part.

[0010] Preferably, the wire clamp includes a downwardly curved main body, with a through hole on the main body. The outer periphery of the main body has multiple downwardly curved sections, the curvature angle of which is greater than that of the main body. The wire clamp is generally quadrilateral in shape, with the curved sections located at the four corners of the main body. A positioning structure is provided between the wire segment and the arc segment to position the wire segment on the arc segment. The positioning structure includes a positioning hole on the arc segment and a positioning post on the wire segment inserted into the positioning hole. Anti-slip stripes are provided on the wire segment.

[0011] Preferably, the middle frame is provided with a slider and a drive assembly for driving the slider to slide. The drive assembly includes a geared motor unit, a connecting rod, and a transmission gear driven by the geared motor unit. One end of the connecting rod is rotatably connected to the slider, and the other end of the connecting rod is eccentrically rotatably connected to the transmission gear. The transmission gear is positioned directly opposite the slider in the sliding direction of the slider. A frame is fixedly connected to the slider. The frame includes a connecting section connected to the slider, an identification section located on one side of the connecting section, and a guide section located on the other side of the connecting section. The connecting section, the identification section, and the guide section are integrally formed. The geared motor unit includes a motor and a gear reduction gear set, and also includes a gear reduction housing fixedly mounted on the base. The gear reduction gear set is disposed in the gear reduction housing. The gear reduction housing includes a gear reduction seat and a gear reduction cover covering the gear reduction seat. The transmission gear is located above the gear reduction cover. The gear reduction seat is provided with a mounting groove for the guide section to extend into, and the guide section is slidably disposed in the mounting groove.

[0012] Preferably, both the slider and the transmission gear are provided with connecting holes, and both ends of the connecting rod are provided with hinge holes. A hinge post is inserted into the connecting hole and the corresponding hinge hole. The connecting rod is rotatably connected to the hinge post through the hinge hole. At least one guide rail is fixedly provided on the base. The slider is slidably provided on the guide rail. Positioning slots are provided on both ends of the base corresponding to the guide rail. Both ends of the guide rail are fixedly installed in the positioning slots.

[0013] Preferably, the middle frame is provided with an operating shaft and a rotating lock body exposed above the cover. The middle frame is provided with a sliding cover that can cover the operating shaft. The sliding cover is provided with a push block exposed above the cover. The operating shaft is provided with a meshing gear that meshes with the transmission gear. The middle frame is fixedly provided with a mounting bracket. The rotating lock body is rotatably mounted on the mounting bracket. The mounting bracket is provided with a guide groove and an arc-shaped groove communicating with the guide groove. The sliding cover is slidably mounted between the reduction housing and the cover. The sliding cover is provided with a guide section located in the guide groove. The guide section is provided with a locking groove. The rotating lock body is provided with a locking block that can move in the arc-shaped groove and is located in the locking groove.

[0014] Preferably, a slot is provided at the connection between the guide groove and the arc groove, the arc groove extends into the guide groove, and an abutment section is provided at the end of the guide section away from the push block. The abutment section can abut against the locking block located in the guide groove. The locking groove is provided on the side wall of the guide section near the slot, and the abutment section is provided at the top of the guide section near the locking groove.

[0015] Preferably, the deceleration housing is provided with a sliding groove, the end of the sliding groove is provided with an extension groove, the sliding cover is provided with a block that is slidably disposed in the sliding groove, the side of the block is provided with an extension section that can be located in the extension groove, the sliding cover is provided with an opening, the sliding cover is provided with a flexible strip at the position of the opening, the flexible strip is provided with a protrusion, and the cover is provided with at least two grooves that cooperate with the protrusion.

[0016] The beneficial effects of the present invention are as follows: The present invention has a reasonable structural design. Through improvements to the operating mechanism and terminal components, the micro switch indicating mechanism is optimized, and the terminal side is better protected. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a specific embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of a specific embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram illustrating the structure of the operating mechanism in a specific embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram illustrating a partial structure of the operating mechanism according to a specific embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram illustrating the structure of the linkage frame according to a specific embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram illustrating the structure of the mounting side frame according to a specific embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram illustrating the structure of the rotating shaft block according to a specific embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram illustrating the structure of the lever block in a specific embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram illustrating the structure of the base and the middle frame according to a specific embodiment of the present invention;

[0026] Figure 10 This is a schematic diagram illustrating the structure of the wiring frame and the arc-extinguishing chamber according to a specific embodiment of the present invention;

[0027] Figure 11 This is a schematic diagram illustrating the structure of the protective cover according to a specific embodiment of the present invention;

[0028] Figure 12 This is a schematic diagram illustrating the structure of the wiring frame and the stationary contact in a specific embodiment of the present invention;

[0029] Figure 13 This is a schematic diagram illustrating the structure of the wiring frame in a specific embodiment of the present invention;

[0030] Figure 14 This is a schematic diagram illustrating the structure of the stationary contact in a specific embodiment of the present invention. Figure 1 ;

[0031] Figure 15 This is a schematic diagram illustrating the structure of the stationary contact in a specific embodiment of the present invention. Figure 2 ;

[0032] Figure 16 This is a schematic diagram illustrating the structure of the pressure plate according to a specific embodiment of the present invention;

[0033] Figure 17 This is a schematic diagram illustrating the structure of the tightening component according to a specific embodiment of the present invention;

[0034] Figure 18 This is a schematic diagram illustrating the structure of the slider located in the middle frame according to a specific embodiment of the present invention;

[0035] Figure 19 This is a schematic diagram illustrating the structure of the driving component according to a specific embodiment of the present invention;

[0036] Figure 20 This is a schematic diagram illustrating the structure of the frame in a specific embodiment of the present invention;

[0037] Figure 21 This is a schematic diagram illustrating the structure of the geared motor unit according to a specific embodiment of the present invention;

[0038] Figure 22 This is a schematic diagram illustrating the internal structure of the deceleration seat according to a specific embodiment of the present invention;

[0039] Figure 23 This is a schematic diagram illustrating the structure of the frame and cover in a specific embodiment of the present invention;

[0040] Figure 24 This is a schematic diagram illustrating a partial internal structure of the frame in a specific embodiment of the present invention;

[0041] Figure 25 This is a schematic diagram of a partial structure of the cover body according to a specific embodiment of the present invention;

[0042] Figure 26 This is a schematic diagram illustrating the structure of the sliding cover and mounting bracket according to a specific embodiment of the present invention;

[0043] Figure 27 This is a schematic diagram illustrating the structure of the deceleration housing in a specific embodiment of the present invention.

[0044] In the diagram: 851, housing; 8511, base; 8512, middle frame; 8513, first mounting plate; 8514, second mounting plate; 852, operating mechanism; 8521, handle; 8522, linkage frame; 85221, insertion part; 85222, pin; 8523, mounting side frame; 85231, receiving slot; 85232, crossbar; 85233, insertion space; 8524, swing frame; 8525, elastic element; 8526, shaft; 85261, flat connecting part; 8527, rotating shaft block; 853, toggle block; 8531, slot; 854, first micro switch; 855, abutment. Part; 856, Second Micro Switch; 857, Contact Assembly; 8571, Moving Contact; 858, Arc Extinguishing Assembly; 859, Terminal Assembly; 861, Wiring Frame; 8611, Wiring Slot; 862, Protective Cover; 8621, Mounting Part; 8622, Heat Dissipation Plate; 8623, Cover Part; 8624, Vent Hole; 8625, Connecting Plate; 8626, Connecting Block; 863, Arc Extinguishing Chamber; 8631, Mounting Base Block; 864, Terminal Cover; 8641, Heat Dissipation Hole; 8712, Arc-shaped Section; 872, Stationary Contact; 8721, Wiring Section; 873, Wire Pressure Plate; 8731, Through Hole; 8732, Main Body 8733, Bending section; 874, Tightening component; 8741, Riveting section; 875, Positioning structure; 8751, Positioning hole; 8752, Positioning post; 876, Anti-slip stripes; 8811, Guide rail; 8812, Positioning groove post; 882, Slider; 8821, Connecting hole; 883, Drive assembly; 884, Gear motor unit; 8841, Motor; 8842, Gear reduction gear set; 8843, Gear reduction housing; 8844, Gear reduction seat; 8845, Gear reduction cover; 8846, Mounting groove; 885, Connecting rod; 8851, Hinge hole; 8852, Hinge post; 886, Transmission gear; 887, Frame ; 8871, connecting section; 8872, marking section; 8873, guide section; 892, cover; 8921, groove; 8932, slide groove; 8933, extension groove; 894, operating shaft; 8941, meshing gear; 895, rotating lock body; 8951, lock block; 896, sliding cover; 8961, push block; 8962, guide section; 8963, lock groove; 8964, abutting section; 8965, block; 8966, extension section; 8967, opening; 8968, flexible strip; 8969, protrusion; 897, mounting bracket; 8971, guide groove; 8972, arc groove; 8973, slot. Detailed Implementation

[0045] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that in the description of this invention, all directional indications (such as up, down, forward, backward, etc.) are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0047] Furthermore, in this invention, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a number" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0049] like Figure 1-27As shown, a molded case circuit breaker includes a housing 851 and an operating mechanism 852, a contact assembly 857, an arc-extinguishing assembly 858, and a terminal assembly 859 disposed within the housing 851. The housing 851 includes a base 8511, a central frame 8512 disposed on the base 8511, and a cover 892 disposed on the central frame 8512. The operating mechanism 852 includes a handle 8521 and a rotating shaft block 8527 linked to the handle 8521. The contact assembly 857 includes a stationary contact 872 and a moving contact 8571 connected to the rotating shaft block 8527. The arc-extinguishing assembly 858 includes an arc-extinguishing chamber 863. The terminal assembly 859 includes a wiring frame 861 disposed on the base 8511 and a wiring groove 861 disposed within the wiring frame 861. 1. A tightening member 874 is provided on the wiring frame 861. The operating mechanism 852 also includes a linkage frame 8522 located below and linked to the handle 8521, two mounting side frames 8523 located on both sides of the linkage frame 8522 and rotatably connected to the linkage frame 8522, a swing frame 8524 located between the two mounting side frames 8523, an elastic member 8525 connecting the swing frame 8524 and the linkage frame 8522, a shaft 8526 rotatably passing through the two mounting side frames 8523 and linked to the swing frame 8524, a rotating shaft block 8527 located below the swing frame 8524 and linked to the swing frame 8524, and a position on the shaft 8526 extending out of one of the mounting side frames 8523 for linkage. The device includes a toggle block 853, with a first micro switch 854 on one side. Rotation of the shaft 8526 causes the toggle block 853 to move, engaging or disengaging with the first micro switch 854. A rotating shaft block 8527 has an abutment part 855, with a second micro switch 856 on one side. Rotation of the rotating shaft block 8527 causes the abutment part 855 to move, engaging or disengaging with the second micro switch 856. The arc-extinguishing chamber 863 includes a mounting base 8631. A protective cover 862 is provided on the wiring frame 861 at a position corresponding to the tightening member 874. The protective cover 862 includes a mounting part 8621 positioned on the top of the wiring frame 861, and a mounting portion 8621 on the mounting part 8621. The cover portion 8623 of the tightening member 874 is provided on the mounting portion 8621 and located between the cover portion 8623 and the arc extinguishing chamber 863. A connecting plate 8625 is provided below the heat dissipation plate 8622 to mate with the mounting base block 8631. A connecting block 8626 is provided on the connecting plate 8625 to mate with the mounting base block 8631. The mounting base block 8631 and the connecting plate 8625 completely cover the wiring groove 8611. The heat dissipation plate 8622 is provided with an exhaust hole 8624 corresponding to the tightening member 874. A terminal cover 864 covering the wiring frame 861 is installed on the housing 851. A heat dissipation hole 8641 is provided on the terminal cover 864 corresponding to the position of the tightening member 874.

[0050] By adopting the above technical solution, the handle 8521 can be moved by actuating the handle 8521 or other components such as the slider 882, and the operation of the various components of the operating mechanism 852 can be coordinated to achieve the opening, closing, and free tripping of the molded case circuit breaker. Specifically, a first microswitch 854 and a second microswitch 856 are provided, both electrically connected to the circuit board located inside the housing 851. When the lever 853 abuts against the first microswitch 854, the first microswitch 854 is closed; when the lever 853 separates from the first microswitch 854, the first microswitch 854 is open. Similarly, when the contact part 855 abuts against the second microswitch 856, the second microswitch 856 is closed; when the contact part 855 separates from the second microswitch 856, the second microswitch 856 is open. Specifically, one possible signal feedback combination is as follows: when both the first microswitch 854 and the second microswitch 856 are closed, the circuit board provides feedback on the tripping signal status; when the first microswitch 854 is closed and the second microswitch 856 is open, a closing signal status is provided; and when the first microswitch 854 is open and the second microswitch 856 is closed, a free-tripping signal status is provided. Since this solution directly improves the existing operating mechanism 852, such as by adding a toggle block 853 and rationally setting the positions of the first microswitch 854 and the second microswitch 856, the toggle block 853, the rotating shaft block 8527, and the abutment part 855 can cooperate with the two microswitches to achieve feedback on the closing, tripping, or free-tripping status. This eliminates the need for additional complex linkage mechanisms, reduces manufacturing costs, and results in a more compact internal structure. Furthermore, during the use of molded case circuit breakers, the small electric arc or high-temperature gas cut off in the arc-extinguishing chamber 863 will be discharged from the vent 8624. Since the vent 8624 is usually not directly opposite the wiring slot 8611 because the wiring slot 8611 contains cables, it is often placed above the wiring frame 861. In the prior art, the tightening member 874 (i.e., the wiring screw) is usually not protected. However, this application provides a protective cover 862, which is positioned and installed on the wiring frame 861 via the mounting part 8621. At this time, the cover part 8623 will cover and protect the tightening member 874, effectively preventing damage to the tightening member 874 caused by the small electric arc or high-temperature gas emanating from the vent 8624, thereby improving the service life of the tightening member 874 and ensuring that the tightening member 874 firmly clamps the cables in the wiring slot 8611. The connecting plate 8625 and the connecting section 8871 are designed to align with the mounting base block 8631 of the arc-extinguishing chamber 863 during the installation of the protective cover 862, thus ensuring the accuracy and stability of the installation of the protective cover 862.Furthermore, the combination of the connecting plate 8625 and the mounting base 8631 can completely shield the wiring slot 8611, preventing small electric arcs or high-temperature gases from entering the wiring slot 8611 and affecting the cable, thus further ensuring safety. The heat dissipation holes 8641 on the terminal cover 864 allow small electric arcs or high-temperature gases blocked by the protective cover 862 to escape.

[0051] As an improved specific implementation, the operating mechanism 852 is located between the base 8511 and the middle frame 8512. The handle 8521 is set through the middle frame 8512 in a direction away from the base 8511. The mounting side frame 8523 is fixedly connected to the base 8511. A first mounting plate 8513 is fixedly connected to the middle frame 8512. A first micro switch 854 is fixedly mounted on the middle frame 8512 through the first mounting plate 8513. A second mounting plate 8514 is fixedly connected to the middle frame 8512. A second micro switch 856 is fixedly mounted on the middle frame 8512 through the second mounting plate 8514.

[0052] By adopting the above technical solution, the connection stability of the mounting side frame 8523 is guaranteed, and the operating mechanism 852 is located between the base 8511 and the middle frame 8512. The base 8511 and the middle frame 8512 can provide good protection for the components of the operating mechanism 852. The first micro switch 854 is specifically fixed on the first mounting plate 8513, and then the first mounting plate 8513 is fixed to the middle frame 8512 by screws passing through the first mounting plate 8513.

[0053] As an improved specific implementation, the mounting side bracket 8523 is provided with a receiving groove 85231, the linkage bracket 8522 has an insertion part 85221 that is inserted into the receiving groove 85231 and rotates with the receiving groove 85231, the linkage bracket 8522 is integrally formed with a pin 85222 above the insertion part 85221, the mounting side bracket 8523 is provided with two crossbars 85232 above the receiving groove 85231, the two crossbars 85232 are provided with protrusions facing opposite directions, and an insertion space 85233 is formed between the two protrusions for the pin 85222 and the insertion part 85221 to be inserted, the part of the shaft 8526 that extends out of the mounting side bracket 8523 is a flat connecting part 85261, and the lever 853 is provided with a slot 8531 that is adapted to the flat connecting part 85261.

[0054] By adopting the above technical solution, this configuration enables the linkage frame 8522 to rotate relative to the mounting side frame 8523. This allows the linkage frame 8522 to drive the swing frame 8524 via the elastic element 8525, which in turn drives the shaft 8526 and the rotating block 8527. The arrangement of the two crossbars 85232 and the insertion space 85233 facilitates the insertion of the pin 85222, thus better ensuring the rotational stability of the insertion part 85221 within the receiving groove 85231. The mating arrangement of the flat connecting part 85261 and the slot 8531 allows the lever 853 to be fitted onto the end of the shaft 8526, thereby achieving a linkage between the lever 853 and the shaft 8526.

[0055] As an improved specific implementation, the bottom of the wiring frame 861 forms an arc-shaped segment 8712, which is curved upwards. The stationary contact 872 includes a wiring segment 8721 located on the arc-shaped segment 8712. The wiring segment 8721 has an arc shape adapted to the arc-shaped segment 8712. The opening of the wiring segment 8721 faces the wiring groove 8611. A wire pressing plate 873 is provided in the wiring groove 8611. A tightening member 874 is provided on the wire pressing plate 873 for tightening. The component 874 is threadedly connected to the top of the wiring frame 861. The tightening component 874 includes a riveting part 8741 located in the wiring groove 8611. The pressure plate 873 is provided with a through hole 8731. The pressure plate 873 is sleeved on the riveting part 8741 through the through hole 8731 and riveted to the riveting part 8741. The pressure plate 873 is vertically limited by the riveting part 8741. There is a gap between the through hole 8731 of the pressure plate 873 and the outer periphery of the riveting part 8741.

[0056] By adopting the above technical solution, and by setting the bottom of the wiring frame 861 as an arc-shaped segment 8712 and setting the wiring segment 8721 of the stationary contact 872 as an arc shape adapted to the arc-shaped segment 8712, the opening area of ​​the wiring groove 8611 is increased, facilitating cable insertion and wiring. Since the wiring segment 8721 is directly in contact with the arc-shaped segment 8712, the cable placed in the wiring frame 861 directly contacts and conducts with the wiring segment 8721, reducing the need for other components to connect the wiring segment 8721 and the arc-shaped segment 8712. This prevents the cable from needing to be electrically connected to the wiring segment 8721 through other components, reducing the temperature rise of the wiring board and the stationary contact 872, resulting in better product performance and a longer service life. Furthermore, by providing a wire clamping plate 873 and a tightening member 874, the tightening member 874 can specifically be a bolt threadedly connected to the junction box 861. The bottom of the bolt has a riveting part 8741 that is riveted to the wire clamping plate 873. The provision of the tightening member 874 and the wire clamping plate 873 can clamp the cable located in the junction box 861. By rotating the tightening member 874, the wire clamping plate 873 moves down until the cable is clamped.

[0057] As an improved specific implementation, the wire clamp 873 includes a downwardly curved main body 8732, a through hole 8731 provided on the main body 8732, and a plurality of downwardly curved portions 8733 provided on the outer peripheral edge of the main body 8732. The bending angle of the curved portions 8733 is greater than the bending angle of the main body 8732. The wire clamp 873 is generally quadrilateral in shape, and the curved portions 8733 are provided at the four corners of the main body 8732. A positioning structure 875 is provided between the wiring segment 8721 and the arc segment 8712 so that the wiring segment 8721 is positioned and installed on the arc segment 8712. The positioning structure 875 includes a positioning hole 8751 provided on the arc segment 8712 and a positioning post 8752 provided on the wiring segment 8721 and inserted into the positioning hole 8751. Anti-slip stripes 876 are provided on the wiring segment 8721.

[0058] By adopting the above technical solution, this configuration allows the pressure plate 873 to better cover the cable when pressing it, providing a certain degree of protection. Furthermore, since the cable has a circular cross-section, the shape of the pressure plate 873 better fits the cable's outer circumference, resulting in a better pressing effect. The positioning structure 875 is also formed by the connecting segment 8721 and the arc-shaped segment 8712 themselves, rather than being connected by other components. This ensures the positioning stability between the connecting plate and the arc-shaped segment 8712 and effectively reduces temperature rise. The anti-slip stripes 876 increase the contact friction with the cable, further enhancing cable pressing.

[0059] As an improved specific implementation, the middle frame 8512 is provided with a slider 882 and a drive assembly 883 for driving the slider 882 to slide. The drive assembly 883 includes a geared motor unit 884, a connecting rod 885, and a transmission gear 886 driven by the geared motor unit 884. One end of the connecting rod 885 is rotatably connected to the slider 882, and the other end of the connecting rod 885 is eccentrically rotatably connected to the transmission gear 886. The transmission gear 886 is positioned directly opposite the slider 882 in the sliding direction of the slider 882. A frame 887 is fixedly connected to the slider 882. The frame 887 includes a connecting section 8871 connected to the slider 882 and a marker located on one side of the connecting section 8871. The identification section 8872 and the guide section 8873 located on the other side of the connecting section 8871 are integrally formed. The geared motor unit 884 includes a motor 8841 and a reduction gear set 8842, and also includes a reduction housing 8843 fixedly installed on the base. The reduction gear set 8842 is disposed in the reduction housing 8843. The reduction housing 8843 includes a reduction seat 8844 and a reduction cover 8845 covering the reduction seat 8844. The transmission gear 886 is located above the reduction cover 8845. The reduction seat 8844 is provided with a mounting groove 8846 for the guide section 8873 to extend into. The guide section 8873 is slidably disposed in the mounting groove 8846.

[0060] By adopting the above technical solution, the transmission gear 886 is driven to rotate by the reduction motor unit 884. Since one end of the connecting rod 885 is eccentrically mounted on the transmission gear 886, as the transmission gear 886 rotates, it drives the slider 882 to slide on the intermediate frame 8512 via the connecting rod 885. Furthermore, by positioning the transmission gear 886 directly opposite the slider 882 in the sliding direction, it is easier for the transmission gear 886 to drive the slider 882. By designing the length of the connecting rod 885, the sliding stroke of the slider 882 can be reasonably limited to better adapt to the electric operating mechanism 852 for action switching. With this configuration, the sliding of the slider 882 can be achieved through a simple structure, resulting in stable, precise, practical, and reliable transmission. Furthermore, the slider 882 and the connecting section 8871 are fixedly connected, thereby fixing the frame 887 onto the slider 882. The marking section 8872 can be equipped with marking stickers to indicate the different states of the circuit breaker. During the sliding of the slider 882, the guide part 8873 can extend into the mounting groove 8846 of the reduction gear seat 8844, with the guide part 8873 slidingly engaging with the mounting groove 8846, further ensuring the sliding stability of the slider 882. The motor 8841 drives the gears in the reduction gear set 8842 to rotate, ultimately driving the transmission gear 886 to rotate, thus achieving the sliding of the slider 882. The reduction gear set 8842 is placed in the reduction housing 8843, effectively protecting it. Placing the transmission gear 886 above the reduction cover 8845 facilitates the eccentric installation of the connecting rod 885 and prevents interference with other components when the connecting rod 885 is driven by the transmission gear 886.

[0061] As an improved specific implementation, both the slider 882 and the transmission gear 886 are provided with connecting holes 8821, and both ends of the connecting rod 885 are provided with hinge holes 8851. A hinge post 8852 is inserted into the connecting hole 8821 and the corresponding hinge hole 8851. The connecting rod 885 is rotatably connected to the hinge post 8852 through the hinge hole 8851. At least one guide rail 8811 is fixedly provided on the base, and the slider 882 is slidably disposed on the guide rail 8811. Positioning slots 8812 are provided on both ends of the base corresponding to the guide rail 8811. The two ends of the guide rail 8811 are fixedly installed in the positioning slots 8812.

[0062] By adopting the above technical solution, using the hinge column 8852, the two ends of the connecting rod 885 are respectively hinged to the transmission gear 886 and the sliding plate. Furthermore, the upper end of the hinge column 8852 is larger than the diameter of the hinge hole 8851, thus better ensuring the transmission stability of the connecting rod 885. Specifically, two guide rails 8811 are provided. Sliding grooves 8932 are provided at the positions of the two guide rails 8811 corresponding to the slider 882. The guide rails 8811 are inserted into the sliding grooves 8932, thus realizing the slider 882. By fixing the two ends of the guide rails 8811 to the positioning grooves 8812, the guide rails 8811 can be positioned and installed on the central frame 8512.

[0063] As an improved specific implementation, the middle frame 8512 is provided with an operating shaft 894 and a rotating lock body 895 exposed above the cover 892. The middle frame 8512 is provided with a sliding cover 896 that can cover the operating shaft 894. The sliding cover 896 is provided with a push block 8961 exposed above the cover 892. The operating shaft 894 is provided with a meshing gear 8941 that meshes with the transmission gear 886. A mounting bracket 897 is fixedly provided on the middle frame 8512. The rotating lock body 895 rotates... The sliding cover 896 is slidably disposed between the deceleration housing 8843 and the cover body 892. The sliding cover 896 is provided with a guide section 8962 located in the guide groove 8971. The guide section 8962 is provided with a locking groove 8963. The rotating lock body 895 is provided with a locking block 8951 that can move in the arc groove 8972 and is located in the locking groove 8963.

[0064] By adopting the above technical solution, during automatic operation, the geared motor unit 884 drives the transmission gear 886 to rotate; during manual operation, a special tool is inserted into the operating shaft 894, and the operating shaft 894 is rotated, which drives the transmission gear 886 to rotate through the meshing gear 8941. Because a sliding cover 896 is provided, the operating shaft 894 is covered by moving the push block 8961, preventing manual operation. However, by providing a rotating lock body 895, when the key is inserted into the rotating lock body 895 and the lock body 895 is rotated, the lock block 8951 rotates with the rotating lock body 895, moves along the arc-shaped groove 8972, and is located in the lock groove 8963, thereby limiting the sliding cover 896. This ensures safety during manual operation and prevents accidental operation.

[0065] As an improved specific implementation, a slot 8973 is provided at the connection between the guide groove 8971 and the arc-shaped groove 8972. The arc-shaped groove 8972 extends into the guide groove 8971. An abutment section 8964 is provided at the end of the guide section 8962 away from the push block 8961. The abutment section 8964 can abut against the locking block 8951 located in the guide groove 8971. The locking groove 8963 is provided on the side wall of the guide section 8962 near the slot 8973. The abutment section 8964 is provided at the top of the guide section 8962 near the locking groove 8963.

[0066] By adopting the above technical solution, the slot 8973 is designed to better connect the guide slot 8971 and the arc-shaped slot 8972, so that the locking block 8951 can be located in the guide slot 8971 when it moves in the arc-shaped slot 8972. Specifically, when the sliding cover 896 slides to expose the operating shaft 894, the locking block 8951 is rotated into the locking slot 8963, which can restrict the sliding of the sliding cover 896; when the sliding cover 896 slides to cover the operating shaft 894, the lock body 895 is rotated, and the locking block 8951 will be located in the guide slot 8971. At this time, the locking block 8951 abuts against the abutment part 855, thereby limiting the sliding of the sliding cover 896.

[0067] As an improved specific implementation, the deceleration housing 8843 is provided with a sliding groove 8932, and the end of the sliding groove 8932 is provided with an extension groove 8933. The sliding cover 896 is provided with a block 8965 that is slidably disposed in the sliding groove 8932. The side of the block is provided with an extension section 8966 that can be located in the extension groove 8933. The sliding cover 896 is provided with an opening 8967. The sliding cover 896 is provided with a flexible strip 8968 at the position of the opening 8967. The flexible strip 8968 is provided with a protrusion 8969. The cover body 892 is provided with at least two grooves 8921 that cooperate with the protrusions 8969.

[0068] By adopting the above technical solution, the cooperation between the block 8965 and the sliding groove 8932 enables the sliding of the cover 896. Alternatively, a sliding structure can be provided between the cover 896 and the cover 892 to further improve the sliding stability of the cover 896. The cooperation between the extension section 8966 and the extension groove 8933 facilitates the placement of the block 8965 within the sliding groove 8932 during installation. Specifically, there can be two grooves 8921, corresponding to the cover 896 covering and exposing the operating shaft 894. The flexible strip 8968 can detach from one groove 8921 and reside in the other, providing tactile feedback when operating the push block 8961.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A molded case circuit breaker, comprising a housing (851) and an operating mechanism (852), a contact assembly (857), an arc-extinguishing assembly (858), and a terminal assembly (859) disposed within the housing (851). The housing (851) includes a base (8511), a central frame (8512) disposed on the base (8511), and a cover (892) disposed on the central frame (8512). The operating mechanism (852) includes a handle (8521) and a contact assembly (859). 21) A linkage rotating shaft block (8527), a contact assembly (857) including a stationary contact (872) and a moving contact (8571) connected to the rotating shaft block (8527), an arc extinguishing assembly (858) including an arc extinguishing chamber (863), and a terminal assembly (859) including a wiring frame (861) on a base (8511), a wiring groove (8611) in the wiring frame (861), and a tightening member (874) on the wiring frame (861), characterized in that, The operating mechanism (852) further includes a linkage frame (8522) located below the handle (8521) and linked to the handle (8521), two mounting side frames (8523) located on both sides of the linkage frame (8522) and rotatably connected to the linkage frame (8522), a swing frame (8524) located between the two mounting side frames (8523), an elastic element (8525) connecting the swing frame (8524) and the linkage frame (8522), a shaft (8526) rotatably passing through the two mounting side frames (8523) and linked to the swing frame (8524), and a rotating block (8527) located on the swing frame (8522). 4) Below and linked with the swing frame (8524), a lever (853) is provided on the shaft (8526) at the position of one of the mounting side brackets (8523). A first micro switch (854) is provided on one side of the lever (853). The rotation of the shaft (8526) drives the lever (853) to move, so that the lever (853) abuts or disengages from the first micro switch (854). A contact part (855) is provided on the rotating shaft block (8527). A second micro switch (856) is provided on one side of the contact part (855). The rotation of the rotating shaft block (8527) drives the contact part (855) to move, so that the contact part (856) abuts or disengages from the first micro switch (854). The part (855) abuts or separates from the second micro switch (856). The arc-extinguishing chamber (863) includes a mounting base (8631). A protective cover (862) is provided on the wiring frame (861) at the position corresponding to the tightening member (874). The protective cover (862) includes a mounting part (8621) positioned and installed on the top of the wiring frame (861), a cover part (8623) provided on the mounting part (8621) and covering the tightening member (874), and a heat sink (8622) provided on the mounting part (8621) and located between the cover part (8623) and the arc-extinguishing chamber (863). The lower part of the heat sink (8622) A connecting plate (8625) extending downwards is provided to mate with the mounting base (8631). A connecting block (8626) mates with the mounting base (8631) on the connecting plate (8625). The mounting base (8631) and the connecting plate (8625) completely cover the wiring groove (8611). A vent (8624) corresponding to the tightening member (874) is provided on the heat sink (8622). A terminal cover (864) covering the wiring frame (861) is installed on the housing (851). A heat dissipation hole (8641) corresponding to the tightening member (874) is provided on the terminal cover (864).

2. A molded case circuit breaker according to claim 1, characterized in that, The operating mechanism (852) is located between the base (8511) and the middle frame (8512). The handle (8521) is set through the middle frame (8512) in a direction away from the base (8511). The mounting side frame (8523) is fixedly connected to the base (8511). The first mounting plate (8513) is fixedly connected to the middle frame (8512). The first micro switch (854) is fixedly mounted on the middle frame (8512) through the first mounting plate (8513). The second mounting plate (8514) is fixedly connected to the middle frame (8512). The second micro switch (856) is fixedly mounted on the middle frame (8512) through the second mounting plate (8514).

3. A molded case circuit breaker according to claim 2, characterized in that, The mounting side bracket (8523) is provided with a receiving groove (85231). The linkage bracket (8522) has an insertion part (85221) that inserts into the receiving groove (85231) and rotatably engages with the receiving groove (85231). The linkage bracket (8522) has an integrally formed pin (85222) above the insertion part (85221). The mounting side bracket (8523) is provided with two crossbars above the receiving groove (85231). 85232), two crossbars (85232) are provided with protruding rods facing opposite directions, and an insertion space (85233) is formed between the two protruding rods for inserting the pin (85222) and the insertion part (85221). The part of the shaft (8526) that extends out of the mounting side bracket (8523) is a flat connecting part (85261). The lever (853) is provided with a slot (8531) that is compatible with the flat connecting part (85261).

4. A molded case circuit breaker according to claim 1, 2, or 3, characterized in that, The bottom of the wiring frame (861) forms an arc-shaped segment (8712), which is curved upward. The stationary contact (872) includes a wiring segment (8721) located on the arc-shaped segment (8712). The wiring segment (8721) has an arc shape that matches the arc-shaped segment (8712). The opening of the wiring segment (8721) faces the wiring groove (8611). A wire pressure plate (873) is provided in the wiring groove (8611). A tightening member (874) is provided on the wire pressure plate (873). The tightening member (874) is threaded. Above the wiring frame (861), the tightening member (874) includes a riveting part (8741) located in the wiring groove (8611). The pressure plate (873) is provided with a through hole (8731). The pressure plate (873) is sleeved on the riveting part (8741) through the through hole (8731) and riveted to the riveting part (8741). The pressure plate (873) is vertically limited by the riveting part (8741). There is a gap between the through hole (8731) of the pressure plate (873) and the outer periphery of the riveting part (8741).

5. A molded case circuit breaker according to claim 4, characterized in that, The wire clamp (873) includes a downwardly curved main body (8732), a through hole (8731) on the main body (8732), and a plurality of downwardly curved portions (8733) on the outer peripheral edge of the main body (8732). The bending angle of the curved portions (8733) is greater than that of the main body (8732). The wire clamp (873) is generally quadrilateral in shape, and the curved portions (8733) are located at the four corners of the main body (8732). A positioning structure (875) is provided between the wiring segment (8721) and the arc segment (8712) so that the wiring segment (8721) is positioned and installed on the arc segment (8712). The positioning structure (875) includes a positioning hole (8751) provided on the arc segment (8712) and a positioning post (8752) provided on the wiring segment (8721) and inserted into the positioning hole (8751). Anti-slip stripes (876) are provided on the wiring segment (8721).

6. A molded case circuit breaker according to claim 4, characterized in that, The middle frame (8512) is provided with a slider (882) and a drive assembly (883) for driving the slider (882) to slide. The drive assembly (883) includes a geared motor unit (884), a connecting rod (885), and a transmission gear (886) driven by the geared motor unit (884). One end of the connecting rod (885) is rotatably connected to the slider (882), and the other end of the connecting rod (885) is eccentrically rotatably connected to the transmission gear (886). The transmission gear (886) is positioned directly opposite the slider (882) in the sliding direction of the slider (882). A frame (887) is fixedly connected to the slider (882). The frame (887) includes a connecting section (8871) connected to the slider (882) and an identification section (8872) located on one side of the connecting section (8871). The connecting section (8871), the marking section (8872), and the guide section (8873) are integrally formed. The geared motor unit (884) includes a motor (8841) and a gear reduction gear set (8842), and also includes a gear reduction housing (8843) fixedly installed on the base. The gear reduction gear set (8842) is disposed in the gear reduction housing (8843). The gear reduction housing (8843) includes a gear reduction seat (8844) and a gear reduction cover (8845) covering the gear reduction seat (8844). The transmission gear (886) is located above the gear reduction cover (8845). The gear reduction seat (8844) is provided with a mounting groove (8846) for the guide section (8873) to extend into. The guide section (8873) is slidably disposed in the mounting groove (8846).

7. A molded case circuit breaker according to claim 6, characterized in that, Both the slider (882) and the transmission gear (886) are provided with connecting holes (8821), and both ends of the connecting rod (885) are provided with hinge holes (8851). A hinge pin (8852) is inserted into the connecting hole (8821) and the corresponding hinge hole (8851). The connecting rod (885) is rotatably connected to the hinge pin (8852) through the hinge hole (8851). At least one guide rail (8811) is fixedly provided on the base. The slider (882) is slidably provided on the guide rail (8811). Both ends of the base corresponding to the guide rail (8811) are provided with positioning groove pins (8812). Both ends of the guide rail (8811) are fixedly installed in the positioning groove pins (8812).

8. A molded case circuit breaker according to claim 7, characterized in that, The middle frame (8512) is provided with an operating shaft (894) and a rotary lock body (895) exposed on the cover (892). The middle frame (8512) is also provided with a sliding cover (896) that can cover the operating shaft (894). The sliding cover (896) is provided with a push block (8961) exposed on the cover (892). The operating shaft (894) is provided with a meshing gear (8941) that meshes with a transmission gear (886). A mounting bracket (897) is fixedly provided on the middle frame (8512), and the rotary lock body (895) is rotatably mounted on the mounting bracket. 897), the mounting bracket (897) is provided with a guide groove (8971) and an arc groove (8972) communicating with the guide groove (8971), the sliding cover (896) is slidably disposed between the deceleration housing (8843) and the cover (892), the sliding cover (896) is provided with a guide section (8962) located in the guide groove (8971), the guide section (8962) is provided with a locking groove (8963), and the rotating lock body (895) is provided with a locking block (8951) that can move in the arc groove (8972) and is located in the locking groove (8963).

9. A molded case circuit breaker according to claim 8, characterized in that, A slot (8973) is provided at the connection between the guide groove (8971) and the arc groove (8972). The arc groove (8972) extends into the guide groove (8971). An abutment section (8964) is provided at the end of the guide section (8962) away from the push block (8961). The abutment section (8964) can abut against the locking block (8951) located in the guide groove (8971). The locking groove (8963) is provided on the side wall of the guide section (8962) near the slot (8973). The abutment section (8964) is provided at the top of the guide section (8962) near the locking groove (8963).

10. A molded case circuit breaker according to claim 9, characterized in that, The deceleration housing (8843) is provided with a sliding groove (8932), and the end of the sliding groove (8932) is provided with an extension groove (8933). The sliding cover (896) is provided with a block (8965) that slides in the sliding groove (8932). The side of the block is provided with an extension section (8966) that can be located in the extension groove (8933). The sliding cover (896) is provided with an opening (8967). The sliding cover (896) is provided with a flexible strip (8968) at the position of the opening (8967). The flexible strip (8968) is provided with a protrusion (8969). The cover (892) is provided with at least two grooves (8921) that cooperate with the protrusions (8969).

Images