Electromagnetic trip and circuit breaker

Abstract

An electromagnetic trip unit includes a housing, within which a coil assembly, armature, magnetic yoke, support, and magnet are assembled. The magnetic yoke cooperates with the coil assembly to drive the armature. The housing also includes a limiting component and a buffer mechanism. The support, magnetic yoke, and magnet are fixedly connected to the limiting component to form a magnet assembly. The magnet assembly is located between the buffer mechanism and the bottom wall of the housing. The top side of the buffer mechanism is limited by the top wall of the housing, and the bottom side of the buffer mechanism has a first clamping structure. The first clamping structure, in conjunction with the magnet assembly, causes the magnet assembly to be interference-fitted between the clamping structure and the bottom wall of the housing. A circuit breaker, including an electromagnetic trip unit, is also included. This invention's electromagnetic trip unit and circuit breaker, through the fixed connection of the support, magnetic yoke, and magnet to the limiting component to form an integrated magnet assembly, feature a miniaturized and modular assembly design, achieving automation feasibility. Furthermore, the interference fit of the buffer mechanism and the bottom wall of the housing ensures reliable fixation of the magnet assembly.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to an electromagnetic trip unit and a circuit breaker. Background Technology

[0002] Electromagnetic trip units are key components of electromagnetic residual current operated circuit breakers. Existing electromagnetic trip units suffer from problems such as large structural size, poor electromagnetic tripping performance, and high difficulty in automated manufacturing, which seriously restrict the structural design and development of residual current operated circuit breakers.

[0003] The key to processing electromagnetic trip units lies in the manufacturing process, which presents two major challenges. First, it is necessary to address the issue of reduced performance or failure of the trip unit caused by armature wear after multiple life reset impacts, in order to improve the life reliability of the electromagnetic trip unit. Second, it is necessary to reliably fix the position of the magnet. Currently, the magnets of electromagnetic trip units are mostly riveted, laser-welded, or encapsulated with glue. Utility Model Content

[0004] The purpose of this invention is to overcome at least one defect of the prior art and to provide an electromagnetic trip unit and a circuit breaker.

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

[0006] An electromagnetic trip unit includes a housing, which comprises a top wall and a bottom wall disposed opposite to each other. A coil assembly, an armature, a magnetic yoke, a support, and a magnet are assembled within the housing. The armature is movably mounted on the support. The magnetic yoke cooperates with the coil assembly to drive the armature to move within the housing. A limiting member and a buffer mechanism are also provided within the housing. The support, magnetic yoke, and magnet are respectively fixedly connected to the limiting member to form a magnet assembly. The magnet assembly is located between the buffer mechanism and the bottom wall of the housing. The top side of the buffer mechanism is limited by the top wall of the housing, and the bottom side of the buffer mechanism is provided with a first pressing structure. The first pressing structure is limited by the magnet assembly, causing the magnet assembly to be interference-fitted between the pressing structure and the bottom wall of the housing.

[0007] Optionally, the first clamping structure includes at least one first clamping part that is limited to the top side of the limiting member and / or at least one second clamping part that is limited to the connection between the top side and the side side of the support member, wherein the side wall of the limiting member is provided with a limiting rib that cooperates with the first clamping part.

[0008] Optionally, the coil assembly includes a coil frame and a coil disposed outside the coil frame. The magnetic yoke passes at least partially through the interior of the coil frame. The coil frame is located between the buffer mechanism and the bottom wall of the housing. The bottom side of the buffer mechanism is provided with a second clamping structure. The second clamping structure cooperates with the coil frame to limit the coil frame between the second clamping structure and the bottom wall of the housing.

[0009] Optionally, the second clamping structure includes at least one third clamping part that is limited to the top side of the coil frame and / or at least one fourth clamping part that is limited to the connection between the top side and the side side of the coil frame.

[0010] Optionally, the limiting member has balancing ribs protruding on both sides, which respectively cooperate with the opposite side walls of the housing to limit the magnet assembly between the opposite side walls of the housing.

[0011] Optionally, the housing includes an upper cover and a base that are arranged vertically and connected to each other. The upper cover includes the top wall of the housing and the side walls of the upper cover integrally connected to the top wall of the housing. The base includes the bottom wall of the housing. The bottom wall of the base is directly engaged with the magnet assembly for limiting. The base is fixedly connected to the limiting member.

[0012] Optionally, the upper cover sidewall is provided with a plurality of slotted holes, and the bottom wall of the base housing is provided with a plurality of upright plates protruding upwards to correspondingly close the plurality of slotted holes. The outer side of the upright plates is provided with a first buckle, which is engaged in the slotted holes.

[0013] The side wall of the limiting member has a protruding retaining rib, and the inner side of at least one upright plate of the base has a protruding second buckle, which is fastened to the top side of the retaining rib.

[0014] Optionally, the housing includes a side cover and a side cover that are arranged on the left and right and connected to each other. The side cover includes a top wall and a bottom wall of the housing, and a side wall of the side cover integrally connected between the top wall and the bottom wall of the housing and opposite to the side cover. The bottom wall of the side cover is indirectly matched with the magnet assembly for limiting. The top side of the bottom wall of the side cover is provided with a gasket that matches the magnet assembly for limiting.

[0015] Alternatively, the bottom wall of the side cover is provided with screw holes, and a limiting screw is installed in the screw holes. The limiting screw can at least partially extend into the side cover from the screw holes to engage with the magnet assembly for limiting.

[0016] Optionally, the limiting member is provided with a first fixing hole and a second fixing hole, the magnet is at least partially fixed in the first fixing hole, the support member includes a support member mounting part that is at least partially fixed in the second fixing hole, and the magnetic yoke includes a magnetic yoke mounting part that is at least partially fixed in the second fixing hole.

[0017] Optionally, the support mounting part and the magnetic yoke mounting part are straight plate structures and are stacked. The portion of the magnetic yoke mounting part located in the second fixing hole has a protruding limiting protrusion, and the portion of the support mounting part located in the second fixing hole has a mating hole that mates with the limiting protrusion.

[0018] And / or, the portion of the support mounting part located outside the second fixing hole has positioning pieces bent on both sides toward the direction of the magnetic yoke mounting part, and the magnetic yoke mounting part is limited between the positioning pieces on both sides of the support mounting part.

[0019] Optionally, the buffer mechanism includes a mounting plate and a buffer plate. The bottom side of the mounting plate is provided with the first pressing structure. The buffer plate is rotatably connected to the mounting plate. The top wall of the housing is provided with a driving hole. A push rod is slidably assembled in the driving hole. The armature drives the buffer plate to drive the push rod to slide along the driving hole.

[0020] Circuit breaker, including the electromagnetic trip unit described in any one of the claims.

[0021] The electromagnetic trip unit and circuit breaker of this utility model are formed by fixing the support, magnetic yoke and magnet to the limiting component to form an integrated magnet assembly. The miniaturized and modular assembly design realizes the feasibility of automation. Furthermore, the magnet assembly is reliably fixed by using a buffer mechanism and the bottom wall of the housing to limit the interference fit, thereby improving the life reliability and electromagnetic tripping performance of the electromagnetic trip unit.

[0022] In addition, the buffer mechanism limits and fixes the internal limiting and / or supporting components of the electromagnetic trip unit to ensure the reliability of the electromagnetic trip unit.

[0023] In addition, the base features a multi-clip design to prevent it from falling off after repeated mechanical impacts, and the upright plate seals the holes, adding to the protection measures and improving the airtightness of the shell to prevent dust from entering.

[0024] In addition, the base is connected to the limiting component to form an integral part with the magnet assembly. The base is connected to the upper cover to limit the upper and lower positions of the magnet assembly within the shell formed by the base and the upper cover.

[0025] In addition, the side covers and side shells set on the left and right form a housing. Since the bottom wall of the housing used to limit the magnet assembly is integrated with the side cover, there is no problem of it falling off due to mechanical impact. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the electromagnetic trip device according to Embodiment 1 of this utility model;

[0027] Figure 2 This is a cross-sectional view of the electromagnetic trip device according to Embodiment 1 of this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the electromagnetic trip device without the housing in Embodiment 1 of this utility model;

[0029] Figure 4 This is a schematic diagram of the electromagnetic trip device according to Embodiment 2 of this utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the electromagnetic trip device with the side cover removed according to Embodiment 2 of this utility model;

[0031] Figure 6 This is a cross-sectional view of the electromagnetic trip device according to Embodiment 2 of this utility model;

[0032] Figure 7 This is a schematic diagram of the structure of the magnet assembly, armature, and return spring of this utility model;

[0033] Figure 8 This is a schematic diagram of the structure of the magnet assembly of this utility model;

[0034] Figure 9 This is a structural schematic diagram of the magnet and limiting component of this utility model;

[0035] Figure 10 This is a schematic diagram of the coil frame structure of this utility model.

[0036] Housing 100; Housing top wall 101; Housing bottom wall 102; Upper cover 110; Snap hole 111; Base 120; Vertical plate 121; First snap 122; Second snap 123; Side cover 130; Gasket 131; Screw hole 132; Limiting screw 133; Side cover 140; Armature 200; Armature attracting part 201; Swinging mating part 202; Mating inclined surface 203; Return spring 210; Magnetic yoke 300; Magnetic yoke mounting part 301; Limiting protrusion 302; Magnetic yoke attracting surface 303; Support 400; Support mounting part 401; Mating hole 402; Positioning piece 403; Accommodating notch 404; Swinging support part 405; Magnet 500; Limiting member 600; Limiting rib 601; Balancing rib 602; Clamping rib 603; Second fixing hole 604; Top rod 700; Buffer mechanism 800; Mounting plate 810; First pressing part 811; Second pressing part 812; Third pressing part 813; Fourth pressing part 814; Limiting piece 815; Buffer plate 820; Buffer plate rotating shaft 821; Coil frame 900; Coil shaft 901; Frame top plate 902; Frame bottom plate 903; Support foot 904. Detailed Implementation

[0037] The specific embodiments of the electromagnetic trip unit and circuit breaker of this utility model are further described below with reference to the accompanying drawings. The electromagnetic trip unit and circuit breaker of this utility model are not limited to the descriptions in the following embodiments.

[0038] like Figure 1-2As shown, the circuit breaker includes an operating mechanism (not shown) and an electromagnetic trip unit. The electromagnetic trip unit includes a housing 100, which includes a top wall 101 and a bottom wall 102 arranged opposite each other. The top wall 101 has a drive hole, and a push rod 700 is slidably mounted in the drive hole. The housing 100 is equipped with a coil assembly, an armature 200, a magnetic yoke 300, a support member 400, and a magnet 500. The armature 200 is movably mounted on the support member 400. The coil of the coil assembly cooperates with the magnetic yoke 300 to drive the armature 200 to move within the housing 100. The armature 200 drives the push rod 700 to slide along the drive hole, so that the push rod 700 extends out of the drive hole or retracts into the drive hole. The push rod 700 triggers the operating mechanism to trip. The electromagnetic trip unit is usually also equipped with a reset spring 210 for resetting the armature 200. One end of the reset spring 210 is connected to the armature 200, and the other end of the reset spring 210 is fixed, for example, connected to the support 400 or the housing 100. When the armature 200 drives the push rod 700 to extend out of the drive hole under the cooperation of the coil of the coil assembly and the magnetic yoke 300, the push rod 700 triggers the operating mechanism to trip. The armature 200 also drives the reset spring 210 to store energy. The reset spring 210 is used to drive the armature 200 to retract the push rod 700 back into the drive hole.

[0039] like Figure 2-3 As shown, the improvement of this application is that the housing 100 is further provided with a limiting member 600 and a buffer mechanism 800. The support member 400, the magnetic yoke 300 and the magnet 500 are respectively fixedly connected to the limiting member 600 to form a magnet assembly. The magnet assembly is located between the buffer mechanism 800 and the bottom wall 102 of the housing. The top side of the buffer mechanism 800 is limited to the top wall 101 of the housing, and the bottom side of the buffer mechanism 800 is provided with a first pressing structure. The first pressing structure is limited to the magnet assembly so that the magnet assembly is interference-limited between the pressing structure and the bottom wall 102 of the housing. In this embodiment, the electromagnetic trip unit and circuit breaker are integrated into a magnet assembly by fixing the support member 400, the magnetic yoke 300 and the magnet 500 to the limiting member 600 respectively. The miniaturized and modular assembly design enables automation. Furthermore, the magnet assembly is reliably fixed by using the buffer mechanism 800 and the bottom wall 102 of the housing to limit the interference fit, thereby improving the life reliability and electromagnetic tripping performance of the electromagnetic trip unit.

[0040] Preferably, the first clamping structure includes at least one first clamping part 811 that engages with the top side of the limiting member 600 and / or at least one second clamping part 812 that engages with the connection between the top and side sides of the support member 400. The side wall of the limiting member 600 has a protruding limiting rib 601 that engages with the first clamping part 811. The buffer mechanism 800 limits and fixes the limiting member 600 and / or the support member 400 inside the electromagnetic trip unit, ensuring the reliability of the electromagnetic trip unit.

[0041] Preferably, the coil assembly includes a coil frame 900 and a coil disposed outside the coil frame 900. The magnetic yoke 300 at least partially passes through the interior of the coil frame 900. The coil frame 900 is located between the buffer mechanism 800 and the bottom wall 102 of the housing. The bottom side of the buffer mechanism 800 is provided with a second clamping structure. The second clamping structure engages with the coil frame 900 to limit the coil frame 900 between the second clamping structure and the bottom wall 102 of the housing. The buffer mechanism 800 limits and fixes the coil frame 900 inside the electromagnetic trip unit, ensuring the reliability of the electromagnetic trip unit. Further, the second clamping structure includes at least one third clamping part 813 that engages with the top side of the coil frame 900 and / or at least one fourth clamping part 814 that engages with the connection between the top and side sides of the coil frame 900.

[0042] Preferably, the limiting member 600 has balancing ribs 602 protruding from both sides, which respectively cooperate with the opposite side walls of the housing 100 to limit the magnet assembly between the opposite side walls of the housing 100. The balancing ribs 602 prevent the magnet assembly from swaying horizontally.

[0043] like Figure 7-9 As shown, the magnet assembly has a modular structure. The limiting member 600 of the magnet assembly is provided with a first fixing hole and a second fixing hole 604. The magnet 500 is at least partially fixed in the first fixing hole. The support member 400 includes a support member mounting part 401 that is at least partially fixed in the second fixing hole 604. The yoke 300 includes a yoke mounting part 301 that is at least partially fixed in the second fixing hole 604.

[0044] The support mounting part 401 and the magnetic yoke mounting part 301 are straight plate structures and are stacked. The portion of the magnetic yoke mounting part 301 located in the second fixing hole 604 has a protruding limiting protrusion 302. The limiting structure between the support 400 and the magnetic yoke 300 is an optional solution. The portion of the support mounting part 401 located in the second fixing hole 604 has a mating hole 402 that cooperates with the limiting protrusion 302. The limiting protrusion 302 of the magnetic yoke 300 and the mating hole 402 of the support 400 are used to prevent detachment.

[0045] Another optional configuration for the limiting structure between the support member 400 and the magnetic yoke 300 is as follows: Positioning pieces 403 are bent on both sides of the portion of the support member mounting part 401 outside the second fixing hole 604, respectively, towards the magnetic yoke mounting part 301. The magnetic yoke mounting part 301 is then positioned between the positioning pieces 403 on both sides of the support member mounting part 401. Either of these two configurations for the limiting structure between the support member 400 and the magnetic yoke 300 can be used, or both can be used together.

[0046] like Figure 7-9 As shown, the limiting member 600 in this embodiment is a block structure, with a first fixing hole and a second fixing hole 604 vertically penetrating through it, and the second fixing hole 604 is open on the side away from the first fixing hole; the magnetic yoke 300 is a U-shaped structure, the bottom edge of the magnetic yoke 300 is limited and fitted with the bottom wall 102 of the housing, the top side of both sides of the magnetic yoke 300 serves as the magnetic yoke attraction surface 303, which is spaced and opposite to the armature 200, and one side of the magnetic yoke 300 serves as the magnetic yoke mounting part 301. The middle part of the mounting part 301 is interference-fitted into the second fixing hole 604 of the limiting member 600, and the other side of the magnetic yoke 300 passes through the interior of the coil frame 900; the magnet 500 is preferably a square column structure made of magnetic steel or other materials, but it can also be a cylindrical or other shaped column structure. The top of the magnet 500 is integrally injection molded into the first fixing hole of the limiting member 600, and the bottom of the magnet 500 is placed on the bottom edge of the magnetic yoke 300 and located between the two sides of the magnetic yoke 300. The support member 400 has an L-shaped structure. One end of the support member 400 is limited and matched with the bottom wall 102 of the housing and connected to the return spring 210. The other end of the support member 400 serves as the support member mounting part 401. The middle part of the support member mounting part 401 is interference-fixed in the second fixing hole 604 of the limiting member 600. The top side of the support member mounting part 401 is provided with a receiving notch 404 and two swing support parts 405 located on both sides of the receiving notch 404 and extending out of the second fixing hole 604. The armature 200 is a straight plate structure that is oscillating. One end of the armature 200 serves as the armature attraction part 201, which is spaced apart from the magnetic yoke attraction surface 303. The other end of the armature 200 is connected to the return spring 210. The two sides of the armature attraction part 201 are respectively provided with oscillating engagement parts 202. The oscillating engagement part 202 is provided with a mating inclined surface 203 that is opposite to the oscillating support part 405. The point where the mating inclined surface 203 abuts against the oscillating support part 405 serves as the fulcrum for the oscillation of the armature 200. When the armature 200 swings toward the yoke 300 until the armature engaging part 201 engages with the yoke engaging surface 303, the mating inclined surface 203 of the armature 200 and the swinging support part 405 of the support member 400 are set at an angle; when the armature 200 swings away from the yoke 300, the armature engaging part 201 separates from the yoke engaging surface 303, and the angle between the mating inclined surface 203 and the swinging support part 405 increases.

[0047] It should be noted that the technical principle of the electromagnetic trip device driving the operating mechanism to trip in this embodiment is the existing technology. For example, when a leakage fault current occurs at the load end of the circuit breaker, the driving current is output to both ends of the coil to generate an excitation current Ia in the coil, thereby forming a reverse demagnetizing force F. When the fault current reaches the set threshold, the reverse demagnetizing force F formed by the excitation current Ia causes the armature 200 to swing away from the magnetic yoke 300. The armature 200 drives the push rod 700 to trigger the operating mechanism to trip, thereby cutting off the fault current circuit. The circuit breaker plays the role of leakage protection. At the same time, the reset spring 210 drives the armature 200 to swing towards the magnetic yoke 300, and the armature engaging part 201 and the magnetic yoke engaging surface 303 re-engage.

[0048] In this embodiment, the magnet 500 and the limiting member 600 are integrally injection molded. Alternatively, the magnet 500 can be interference-fitted with the first fixing hole of the limiting member 600 or other limiting structures can be provided to prevent the magnet 500 from coming out of the first fixing hole. The support mounting part 401 and the yoke mounting part 301 are respectively interference-fitted with the second fixing hole 604. Alternatively, other limiting structures can be provided to prevent the support mounting part 401 and the yoke mounting part 301 from coming out of the second fixing hole 604.

[0049] like Figure 10 As shown, the coil frame 900 of this embodiment includes a hollow coil shaft 901, with the coil wound on the outer side of the coil shaft 901. The other side of the magnetic yoke 300 passes through the interior of the coil shaft 901. The two ends of the coil shaft 901 are provided with a frame top plate 902 and a frame bottom plate 903. The top side of the frame top plate 902 is limited and engaged with the third pressing part 813. The connection between the top side and the side side of the frame top plate 902 is limited and engaged with the fourth pressing part 814. The frame bottom plate 903 is placed on the bottom edge of the magnetic yoke 300, and the bottom side of the frame bottom plate 903 is provided with a support foot 904 for limited engagement with the bottom wall 102 of the housing.

[0050] like Figure 2-3As shown, the buffer mechanism 800 of this embodiment includes a mounting plate 810 and a buffer plate 820. The bottom side of the mounting plate 810 is provided with a first pressing structure and a second pressing structure. The middle position of the bottom side of the mounting plate 810 is provided with a first pressing part 811 and a third pressing part 813 respectively. The bottom side of the mounting plate 810 near the first pressing part 811 is provided with a notch-shaped second pressing part 812. The second pressing part 812 has an L-shaped wall with an opening facing the first pressing part 811. The bottom side of the mounting plate 810 near the third pressing part 813 is provided with a protruding structure. The protruding structure is provided with a notch-shaped fourth pressing part 814. The fourth pressing part 814 has an L-shaped wall with an opening facing the third pressing part 813 or other folded walls. The buffer plate 820 is rotatably connected to the mounting plate 810. The armature 200 drives the buffer plate 820 to drive the top rod 700 to slide along the drive hole. The buffer mechanism 800 has a shock absorption function, which reduces the impact of shocks on the lifespan and improves the reliability of the lifespan.

[0051] Specifically, in combination Figure 3 and Figure 6 In this embodiment, the buffer mechanism 800 is provided with two mounting plates 810, which are connected by multiple connecting shafts. One end of the buffer plate 820 is provided with a buffer plate rotating shaft 821, and the two ends of the buffer plate rotating shaft 821 are respectively rotatably connected to the rotating holes of the two mounting plates 810. The other end of the buffer plate 820 serves as the buffer plate driving end, which rests on the armature suction part 201 and is positioned opposite to the bottom of the top rod 700. One mounting plate 810 of the buffer mechanism 800 extends to the other mounting plate 810 and is provided with a limiting piece 815. The limiting piece 815 is provided with a top rod assembly hole, and the top rod 700 is slidably assembled in the top rod assembly hole of the mounting plate 810. One end of the top rod 700 serves as the driven end of the top rod, and the other end of the top rod 700 serves as the driving end of the top rod, extending into the driving hole of the top wall 101 of the upper cover 110.

[0052] like Figure 1-3 As shown, in a first embodiment of the housing 100, the housing 100 includes an upper cover 110 and a base 120 that are arranged vertically and connected together. The upper cover 110 includes a top wall 101 and upper cover sidewalls integrally connected to the top wall 101. The base 120 includes a bottom wall 102, which directly engages with the magnet assembly for positioning. The base 120 is fixedly connected to the limiting member 600. The vertical arrangement of the upper cover 110 and the base 120 facilitates assembly. The connection between the base 120 and the limiting member 600 enables the magnet assembly to be integrated with the housing 100. The connection between the base 120 and the upper cover 110 allows the magnet assembly to be vertically and vertically positioned within the housing 100 formed by the base 120 and the upper cover 110.

[0053] In this embodiment, the connection structure between the upper cover 110 and the base 120 includes a plurality of spaced-apart locking holes 111 on the side wall of the upper cover. The bottom wall 102 of the base 120 has a plurality of upward-protruding upright plates 121 near its edge, which are used to correspondingly close the locking holes 111. A first buckle 122 protrudes from the outer side of each upright plate 121 and engages with the locking holes 111. Since the base 120 is fixedly connected to the limiting member 600, i.e., integrated with the magnet assembly, the multi-buckle design of the base 120 prevents it from detaching after repeated mechanical impacts. Furthermore, the upright plates 121 close the locking holes 111, increasing the sealing of the housing 100 and preventing dust from entering.

[0054] In this embodiment, the connection structure between the base 120 and the limiting member 600 includes a retaining rib 603 protruding from the side wall of the limiting member 600, and a second buckle 123 protruding from the inner side of at least one upright plate 121 of the base 120, which fastens onto the top side of the retaining rib 603. This embodiment adds a second buckle 123 to the base 120 to fix the limiting member 600, allowing the magnet assembly to be doubly limited by the buffer mechanism 800 and the base 120, thus more reliably fixing the magnet assembly within the housing 100.

[0055] The installation process of the circuit breaker in this embodiment is as follows:

[0056] The buffer mechanism 800 and the top rod 700 are assembled into one unit. That is, the top rod 700 and the buffer plate 820 are first assembled on one mounting plate 810 of the buffer mechanism 800, and then another mounting plate 810 is assembled. Then the buffer mechanism 800 and the top rod 700 are installed together into the upper cover 110 to form the upper cover module.

[0057] After the support member 400 and the magnetic yoke 300 are assembled, they are inserted together into the second fixing hole 604 of the limiting member 600, which is integrated with the magnet 500, to form a shape as shown in the figure. Figure 8 The integrated magnet assembly is shown. Then, a coil assembly (coil frame 900 with coil) and an armature 200 are assembled on the yoke 300 of the magnet assembly. The armatures 200 at both ends of the return spring 210 are connected to the support member 400 of the magnet assembly. Then, the integrated magnet assembly, coil assembly, armature 200 and return spring 210 are mounted together on the base 120 to form a base module.

[0058] Finally, the base 120 of the base module is assembled with the upper cover 110 of the upper cover module, so that the base module and the upper cover module are assembled into the circuit breaker of this embodiment.

[0059] like Figure 1-3As shown, in the second embodiment of the housing 100, the housing 100 includes a side cover 130 and a side cover 140 that are arranged on the left and right and connected to each other. The side cover 130 includes the housing top wall 101 and the housing bottom wall 102, as well as a side cover side wall integrally connected between the housing top wall 101 and the housing bottom wall 102 and opposite to the side cover 140. The difference from the first embodiment is that the side cover 130 and the side cover 140 arranged on the left and right form the housing 100 of this embodiment. Since the housing bottom wall 102 used for limiting the magnet assembly is integrated with the side cover 130, the problem of the base 120 being mechanically knocked off does not exist in this embodiment. The difference from the first embodiment is that in this embodiment, the bottom wall 102 of the side cover 130 is indirectly engaged with the magnet assembly. In one option, the top side of the bottom wall 102 of the side cover 130 is provided with a gasket 131 that engages with the magnet assembly, that is, the gasket 131 is disposed between the bottom wall 102 of the side cover 130 and the magnet assembly.

[0060] Alternatively, the bottom wall 102 of the side cover 130 can be indirectly engaged with the magnet assembly for positioning. In this alternative configuration, the bottom wall 102 of the side cover 130 has screw holes 132, and a positioning screw 133 is fitted into these screw holes 132. The positioning screw 133 can at least partially extend from the screw hole 132 into the side cover 130 to engage with the magnet assembly for positioning. Either of these two configurations for the indirect engagement of the bottom wall 102 of the side cover 130 with the magnet assembly can be used.

[0061] The installation process of the circuit breaker in this embodiment is as follows:

[0062] After the support member 400 and the magnetic yoke 300 are assembled, they are inserted together into the second fixing hole 604 of the limiting member 600, which is integrated with the magnet 500, to form a shape as shown in the figure. Figure 8 The integrated magnet assembly shown is further assembled with a coil assembly (coil frame 900 with coil) and an armature 200 on the yoke 300 of the magnet assembly. The two ends of the return spring 210 are respectively connected to the armature 200 and the support member 400 of the magnet assembly. That is, the magnet assembly, coil assembly, armature 200 and return spring 210 are integrated.

[0063] First, a mounting plate 810, a top rod 700, and a buffer plate 820 are installed inside the side cover 130. Then, an integrated magnet assembly, a coil assembly, an armature 200, and a return spring 210 are installed. Then, another mounting plate 810 is installed. At this time, there is an assembly gap between the buffer mechanism 800 and the integrated magnet assembly and coil assembly and the side cover 130 in the vertical direction. Then, a shim 131 / limiting screw 133 is installed. That is, the assembly gap is filled by the shim 131 / limiting screw 133, so that the buffer mechanism 800 and the integrated magnet assembly and coil assembly are tightly fitted between the top wall 101 and the bottom wall 102 of the side cover 130.

[0064] Finally, the side cover 130 and the side cover 140 are assembled to form the circuit breaker of this embodiment.

[0065] 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0066] 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. An electromagnetic trip unit, comprising a housing (100), the housing (100) comprising a top wall (101) and a bottom wall (102) disposed opposite to each other, wherein a coil assembly, an armature (200), a magnetic yoke (300), a support (400), and a magnet (500) are assembled inside the housing (100), the armature (200) being movably mounted on the support (400), and the magnetic yoke (300) cooperating with the coil assembly to drive the armature (200) to move within the housing (100), characterized in that: The housing (100) is further provided with a limiting member (600) and a buffer mechanism (800). The support member (400), the magnetic yoke (300) and the magnet (500) are respectively fixedly connected to the limiting member (600) to form a magnet assembly. The magnet assembly is located between the buffer mechanism (800) and the bottom wall (102) of the housing. The top side of the buffer mechanism (800) is limited to the top wall (101) of the housing, and the bottom side of the buffer mechanism (800) is provided with a first pressing structure. The first pressing structure is limited to the magnet assembly so that the magnet assembly is interference-limited between the pressing structure and the bottom wall (102) of the housing.

2. The electromagnetic trip unit of claim 1, wherein: The first clamping structure includes at least one first clamping part (811) that is limited to the top side of the limiting member (600) and / or at least one second clamping part (812) that is limited to the connection between the top side and the side side of the support member (400). The side wall of the limiting member (600) is provided with a limiting rib (601) that cooperates with the first clamping part (811).

3. The electromagnetic trip unit of claim 1, wherein: The coil assembly includes a coil frame (900) and a coil disposed outside the coil frame (900). The magnetic yoke (300) passes at least partially through the interior of the coil frame (900). The coil frame (900) is located between the buffer mechanism (800) and the bottom wall (102) of the housing. The bottom side of the buffer mechanism (800) is provided with a second pressing structure. The second pressing structure cooperates with the coil frame (900) to limit the coil frame (900) between the second pressing structure and the bottom wall (102) of the housing.

4. The electromagnetic trip unit of claim 3, wherein: The second clamping structure includes at least one third clamping part (813) that is limited to the top side of the coil frame (900) and / or at least one fourth clamping part (814) that is limited to the connection between the top side and the side side of the coil frame (900).

5. The electromagnetic trip unit of claim 1, wherein: The limiting member (600) has balancing ribs (602) protruding on both sides, which respectively cooperate with the opposite side walls of the housing (100) to limit the magnet assembly between the opposite side walls of the housing (100).

6. The electromagnetic trip unit of claim 1, wherein: The housing (100) includes an upper cover (110) and a base (120) that are arranged vertically and connected together. The upper cover (110) includes the top wall (101) of the housing and the side walls of the upper cover integrally connected to the top wall (101) of the housing. The base (120) includes the bottom wall (102) of the housing. The bottom wall (102) of the base (120) is directly engaged with the magnet assembly for limiting. The base (120) is fixedly connected to the limiting member (600).

7. The electromagnetic trip unit of claim 6, wherein: The upper cover sidewall is provided with a plurality of slotted holes (111) spaced apart. The bottom wall (102) of the base (120) is provided with a plurality of upright plates (121) protruding upward, which are used to correspondingly close the plurality of slotted holes (111). The outer side of the upright plate (121) is provided with a first buckle (122), which is inserted into the slotted hole (111). The side wall of the limiting member (600) is provided with a retaining rib (603), and the inner side of at least one upright plate (121) of the base (120) is provided with a second buckle (123), which is fastened to the top side of the retaining rib (603).

8. The electromagnetic trip unit of claim 1, wherein: The housing (100) includes a side cover (130) and a side cover (140) that are arranged on the left and right and connected to each other. The side cover (130) includes a top wall (101) and a bottom wall (102) of the housing, and a side wall of the side cover integrally connected between the top wall (101) and the bottom wall (102) of the housing and opposite to the side cover (140). The bottom wall (102) of the side cover (130) is indirectly engaged with the magnet assembly for limiting. The top side of the bottom wall (102) of the side cover (130) is provided with a gasket (131) for limiting with the magnet assembly. Alternatively, the bottom wall (102) of the side cover (130) is provided with a screw hole (132), and a limiting screw (133) is installed in the screw hole (132). The limiting screw (133) can at least partially extend from the screw hole (132) into the side cover (130) to limit the engagement with the magnet assembly.

9. The electromagnetic trip unit of claim 1, wherein: The limiting member (600) is provided with a first fixing hole and a second fixing hole (604). The magnet (500) is at least partially fixed in the first fixing hole. The support member (400) includes a support member mounting portion (401) that is at least partially fixed in the second fixing hole (604). The magnetic yoke (300) includes a magnetic yoke mounting portion (301) that is at least partially fixed in the second fixing hole (604).

10. The electromagnetic trip unit of claim 9, wherein: The support mounting part (401) and the magnetic yoke mounting part (301) are straight plate structures and are stacked. The portion of the magnetic yoke mounting part (301) located in the second fixing hole (604) has a protruding limiting protrusion (302). The portion of the support mounting part (401) located in the second fixing hole (604) has a mating hole (402) that mates with the limiting protrusion (302). And / or, the support mounting part (401) located outside the second fixing hole (604) has positioning pieces (403) bent on both sides toward the magnetic yoke mounting part (301), and the magnetic yoke mounting part (301) is limited between the positioning pieces (403) on both sides of the support mounting part (401).

11. The electromagnetic trip unit of claim 1, wherein: The buffer mechanism (800) includes a mounting plate (810) and a buffer plate (820). The bottom side of the mounting plate (810) is provided with the first pressing structure. The buffer plate (820) is rotatably connected to the mounting plate (810). The top wall (101) of the housing is provided with a driving hole. A push rod (700) is slidably assembled in the driving hole. The armature (200) drives the buffer plate (820) to drive the push rod (700) to slide along the driving hole.

12. A circuit breaker characterized by: Including the electromagnetic trip unit as described in any one of claims 1-11.

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