Miniature electromagnetic release

Abstract

The invention relates to a miniature electromagnetic release. Relates to the technical field of trippers and comprises a yoke, one side of the yoke is fixedly connected with a coil framework component, and the other side of the yoke is fixedly connected with an elastic device. An armature is arranged above the yoke, and the top of the armature is attached to the bottom of the push rod; the elastic device comprises a fixed part, a connecting part is fixedly connected to the lower end of the side, away from the positioning component, of the fixed part, the bottom of the connecting part is rotationally connected with a stud, the upper end of the stud is sleeved with a movable part, and a nut is arranged on the inner side of the movable part and is in threaded connection with the stud. The connecting piece is provided with an elastic piece far away from the fixed piece; the nut and the movable part can be driven to move by rotating the stud, so that the elastic force of the elastic part is changed; the gap between the permanent magnet and the armature body can generate magnetic resistance, and the size of the gap can change the size of the magnetic resistance, so that the attraction force of the yoke to the armature is changed; the suction force of the permanent magnet can be changed by changing the volume of the permanent magnet; by changing the attraction force of the permanent magnet, the release can be suitable for different environments.

Description

Technical Field

[0001] This invention relates to the field of trip unit technology, and specifically to a miniature electromagnetic trip unit. Background Technology

[0002] A trip unit is a device mechanically connected to a circuit breaker, used to release the holding mechanism and automatically disconnect the circuit breaker. Trip units are classified into thermal trip units, electromagnetic trip units, and combined trip units. Different trip units are used in different environments. Thermal trip units are mainly used for overload protection and are more sensitive to long-term overcurrent. They are generally suitable for low-voltage circuit breakers in household and small industrial equipment. Electromagnetic trip units are mainly used for short-circuit protection and can quickly disconnect large current faults. They are widely used in various types of circuit breakers. Combined trip units are composed of thermal trip units and electromagnetic trip units and are suitable for applications with high protection requirements, such as circuit breakers in industrial and commercial power systems.

[0003] Among various trip units, electromagnetic trip units have the widest range of applications. Chinese Patent Publication No. CN207834222U discloses a magnetic flux trip unit, which includes a trip unit housing, a magnetic flux unit disposed in the middle of the trip unit housing, and a push rod and a reset guide rod disposed inside the trip unit housing and cooperating with the magnetic flux unit. The magnetic flux unit includes a push rod for driving the push rod. The reset guide rod includes a reset guide rod catch at one end and a reset guide rod reset plate at the other end. The reset guide rod catch is limited to the push rod, and the reset guide rod reset plate is elastically connected to the trip unit housing through a reset guide rod reset spring.

[0004] The aforementioned trip unit utilizes a magnetic flux unit to drive a push rod to rotate. A reset guide rod clamp locks the push rod, and pressing the reset guide rod reset plate releases the clamp between the reset guide rod and the push rod, causing the push rod to automatically reset. The reset unit of this trip unit uses a reset spring. While the spring force can move the reset guide rod, it suffers from elastic fatigue after prolonged use, leading to weakened spring force and loosening of the reset guide rod. Furthermore, the required spring force varies depending on the application scenario. The spring force in this trip unit is fixed and cannot be adjusted according to the specific application, limiting its applicability and failing to meet the requirements for versatility. Summary of the Invention

[0005] Technical problems to be solved

[0006] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide a miniature electromagnetic trip device. By rotating the stud, the position of the nut and the movable part can be adjusted. When the movable part moves, it can change the length of the elastic element. This allows the elastic force of the elastic element to be changed according to the working requirements, and it can also be adjusted when the elastic element experiences elastic fatigue, so that the elastic force of the elastic element is always at a suitable value, thereby solving the above-mentioned technical problems.

[0007] Technical solution

[0008] To achieve the objectives of this invention, the technical solution adopted is as follows:

[0009] A miniature electromagnetic trip device includes a yoke, one side of which is fixedly connected to a coil frame component and the other side is fixedly connected to an elastic device; an armature is provided above the yoke, the top of which is in contact with the bottom of a push rod.

[0010] The elastic device includes a fixing member, a connecting member fixedly connected to the lower end of the fixing member away from the positioning component, the bottom of the connecting member being rotatably connected to a stud, and a movable member sleeved on the upper end of the stud. The movable member is C-shaped and has a nut on its inner side, which is threadedly connected to the stud. The connecting member has a rectangular groove on its inner side, and the screw, movable member, and nut are all located in the rectangular groove of the connecting member. The connecting member has an elastic member away from the fixing member, and hooks are provided at the top and bottom of the elastic member. The bottom of the elastic member is engaged with the end of the movable member through the hooks.

[0011] The armature includes an armature body, which has a bent part in the middle of one end near the elastic member, and the top of the elastic member is engaged with the bent part by a hook; the armature body has grooves on both sides of one end near the bent part, and the concave surface of the groove of the armature body is rotatably connected to the top of the fixing member.

[0012] As a further technical solution of the present invention, the top of the fixing member is provided with two protruding plates, and the two protruding plates are respectively rotatably connected to the concave surfaces of the two grooves of the armature body; the upper end of one of the two protruding plates is bent inward and forms an L shape, and the two protruding plates are respectively located in the two grooves.

[0013] As a further technical solution of the present invention, the yoke includes two yoke bodies, and the two yoke bodies are fixedly connected to each other as a whole; both ends of the yoke body are provided with protruding posts, and the yoke body is in the shape of a U; the yoke body is fixedly connected to a permanent magnet, and the permanent magnet is located between the two protruding posts of the yoke body; the fixing member is sleeved on the outside of the protruding post of the yoke body near the end of the elastic member.

[0014] As a further technical solution of the present invention, the coil frame component includes a column, which is sleeved on the outside of the protrusion of the yoke body at the end away from the fixing member; the top of the column is fixedly connected to the upper groove and the bottom is fixedly connected to the lower groove; a through groove is provided in the middle of the column, which passes through the upper groove, the column and the lower groove, and the protrusion of the yoke body is located in the through groove.

[0015] As a further technical solution of the present invention, the upper groove body is provided with a through groove two at the end away from the through groove one, and the through groove two corresponds to the position of the permanent magnet; the lower end of the lower groove body is fixedly connected with pins on both sides, and the pins are L-shaped; the top of the upper groove body is provided with an inner groove, the inner groove of the upper groove body corresponds to the position of the armature body, and the width of the inner groove of the upper groove body is greater than the width of the armature body; the bottom of the lower groove body is provided with an inner groove, and the two yoke bodies are located in the inner groove of the lower groove body; multiple slots two are provided on both sides of the upper groove body.

[0016] As a further technical solution of the present invention, the outer side of the yoke is provided with a lower outer shell, which is snapped into the upper outer shell; the elastic device, armature, push rod, yoke, permanent magnet and positioning component are all located in the internal space after the lower outer shell and the upper outer shell are connected.

[0017] As a further technical solution of the present invention, the upper outer shell includes an upper housing, and multiple slots are provided on both sides of the lower end of the upper housing; the top of the upper housing is provided with a movable hole, the position of which corresponds to the position of the push rod, and the diameter of the movable hole is larger than the diameter of the upper end of the push rod; the upper end of the push rod is cylindrical and the lower end is umbrella-shaped.

[0018] As a further technical solution of the present invention, the lower outer shell includes a lower housing, on both sides of the upper end of the lower housing are provided with a plurality of locking blocks 1, and the positions of the plurality of locking blocks 1 correspond to the positions of the plurality of locking slots 1 respectively; an operating hole is provided at one bottom end of the lower housing, the position of the operating hole corresponds to the position of the stud; two rectangular holes are symmetrically provided at the end of the lower housing away from the operating hole, the positions of the two rectangular holes correspond to the positions of the two pins respectively, and the end of the pin away from the lower slot extends to the lower part of the lower housing through the rectangular holes; a plurality of locking blocks 2 are provided at the upper ends of both sides of the interior of the lower housing, and the positions of the plurality of locking blocks 2 correspond to the positions of the plurality of locking slots 2 respectively.

[0019] Beneficial effects:

[0020] A. In this invention, a coil is sleeved on the outer side of the coil frame column. Under normal conditions, the armature body is attracted to the permanent magnet by the magnetic force of the permanent magnet and completely fits into the inner groove of the upper slot. At the same time, the bending part at the end of the armature body stretches the elastic element, keeping the elastic element in a stable and taut state. When a short circuit occurs, or the current through the circuit breaker reaches or exceeds the instantaneous current setting value, the magnetic field generated by the yoke inside the coil ring overcomes the magnetic field generated by the permanent magnet. The attraction effect of this magnetic field on the armature body is less than the pulling effect of the elastic force of the elastic element on the armature body. At this time, the elastic element will pull... The armature body rotates around the connection point with the fixed part, moving away from the permanent magnet. During this movement, the armature body pushes the push rod, causing it to move upward, thereby tripping the circuit breaker (how the trip unit drives the circuit breaker to trip is existing technology, and its connection and operation principle will not be elaborated here). The permanent magnet has strong magnetism and can generate a sufficient magnetic field strength. This magnetic field strength is crucial for realizing the function of the trip unit, because it can ensure that the trip unit can maintain stable performance and reliable tripping effect when facing various working environments and conditions.

[0021] B. In this invention, rotating the stud can drive the nut to move vertically, and the nut simultaneously drives the movable part to move. During the movement, the movable part can change the elastic force of the elastic element. By changing the elastic force of the elastic element, the attraction force of the permanent magnet to the armature body through the magnetic conduction of the yoke can be changed. In addition, the gap between the permanent magnet and the armature body will generate magnetic resistance. The size of the gap between the magnet and the armature can also change the magnitude of the magnetic resistance. The smaller the magnetic resistance, the greater the attraction force, and vice versa. Changing the volume of the permanent magnet can also change the attraction force of the permanent magnet. Through the above multiple methods, the attraction force of the permanent magnet can be changed, so that the trip device can be used in different environments.

[0022] C. In this invention, both the armature body and the yoke body are made using punching technology, resulting in a straight structure that ensures the internal structure of the armature body and yoke body is not damaged. This prevents the magnetic circuit system within the trip unit from bending and keeps the magnetic circuit system stable. Furthermore, the rotation fulcrum where the armature body and yoke body contact each other is arc-shaped, which reduces damage caused by friction between the armature body and yoke body during rotation. One of the protruding plates on the top of the fixing member is bent inward and forms an L-shape. This protruding plate can limit the rotation angle of the armature and prevent excessive rotation of the armature body. Combined with the two grooves, it can prevent the armature from shifting and causing displacement.

[0023] D. In this invention, the lower housing is engaged with the upper housing through multiple locking blocks, and the lower housing is also engaged with the upper groove through multiple locking blocks. After the lower housing and the upper housing are engaged and fixed, there is a misaligned contact surface at the contact point between the lower housing and the upper housing. The misaligned contact surface can play a sealing role, preventing external dust from entering the interior of the lower housing and the upper housing through the gap at the connection point, thereby ensuring the stability of the magnetic circuit system inside the lower housing and the upper housing. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0025] Figure 2 In this invention Figure 1 Top view;

[0026] Figure 3 In this invention Figure 2 AA section view;

[0027] Figure 4 This is a three-dimensional structural diagram of the upper outer shell of the present invention;

[0028] Figure 5 In this invention Figure 4 A bottom view;

[0029] Figure 6 This is a three-dimensional structural diagram of the lower outer shell of the present invention;

[0030] Figure 7 In this invention Figure 6 A bottom view;

[0031] Figure 8 This is a schematic diagram of the normal state of the present invention;

[0032] Figure 9 This is a schematic diagram illustrating the usage state of the present invention;

[0033] Figure 10 In this invention Figure 8 Partial structural diagram;

[0034] Figure 11 In this invention Figure 10 Another perspective view;

[0035] Figure 12 In this invention Figure 9 Partial structural diagram;

[0036] Figure 13 In this invention Figure 12 Another perspective view;

[0037] Figure 14 In this invention Figure 10Partial structural diagram;

[0038] Figure 15 In this invention Figure 14 Partial structural diagram;

[0039] Figure 16 This is a diagram showing the positional relationship between the yoke and the permanent magnet in this invention;

[0040] Figure 17 In this invention Figure 11 Partial structural diagram;

[0041] Figure 18 In this invention Figure 17 The main view;

[0042] Figure 19 In this invention Figure 12 Partial structural diagram;

[0043] Figure 20 In this invention Figure 19 The main view;

[0044] Figure 21 This is a three-dimensional structural diagram of the armature of the present invention;

[0045] Figure 22 In this invention Figure 19 Partial structural diagram;

[0046] Figure 23 In this invention Figure 17 A partial structural diagram.

[0047] In the diagram: 1-elastic device, 2-armature, 3-push rod, 4-yoke, 5-permanent magnet, 6-coil frame component, 7-lower outer shell, 8-upper outer shell, 9-pin;

[0048] 11-Fixed component, 12-Connector, 13-Stud, 14-Moving component, 15-Nut, 16-Elastic component, 21-Armature body, 22-Groove, 23-Bent component, 41-Yoke body, 42-Machined hole, 61-Upper groove, 62-Through groove one, 63-Through groove two, 64-Post, 65-Lower groove, 66-Slot two, 71-Lower housing, 72-Slot one, 73-Operating hole, 74-Rectangular hole, 75-Slot two, 81-Upper housing, 82-Slot one, 83-Moving hole. Detailed Implementation

[0049] Please see Figure 1-4 , Figure 12-13 , Figure 15-19A miniature electromagnetic trip device includes a yoke 4, one side of which is fixedly connected to a coil frame component 6 and the other side is fixedly connected to an elastic device 1; an armature 2 is provided above the yoke 4, and the top of the armature 2 is in contact with the bottom of a push rod 3;

[0050] The elastic device 1 includes a fixing member 11, with a connecting member 12 fixedly connected to the lower end of the fixing member 11 away from the coil frame component 6. The bottom of the connecting member 12 is rotatably connected to a stud 13. A movable member 14 is sleeved on the upper end of the stud 13. The movable member 14 is C-shaped and has a nut 15 on its inner side, which is threaded to the stud 13. A rectangular groove is provided on the inner side of the connecting member 12, and the stud 13, the movable member 14, and the nut 15 are all located in the rectangular groove of the connecting member 12. An elastic member 16 is provided on the connecting member 12 away from the fixing member 11. The top and bottom of the elastic member 16 are provided with hooks, and the bottom of the elastic member 16 is engaged with the end of the movable member 14 through the hooks.

[0051] The coil frame component 6 includes a column 64, which is sleeved on the outside of the protrusion of the yoke body 41 at the end away from the fixing member 11; the top of the column 64 is fixedly connected to the upper groove 61 and the bottom is fixedly connected to the lower groove 65; a through groove 62 is provided in the middle of the column 64, which passes through the upper groove 61, the column 64 and the lower groove 65, and the protrusion of the yoke body 41 is located in the through groove 62.

[0052] The upper groove 61 has a through groove 63 at the end away from the through groove 62, which corresponds to the position of the permanent magnet 5. The lower groove 65 has coil pins 9 fixedly connected to both sides of its lower end, and the coil pins 9 are L-shaped. The upper groove 61 has an inner groove at the top, which corresponds to the position of the armature body 21, and the width of the inner groove of the upper groove 61 is greater than the width of the armature body 21. The lower groove 65 has an inner groove at the bottom, and both yoke bodies 41 are located in the inner groove of the lower groove 65. The upper groove 61 has multiple slots 66 on both sides.

[0053] By adopting the above technical solution, the rotating stud 13 can drive the nut 15 to move vertically. The nut 15 simultaneously drives the movable part 14 to move. During the movement, the movable part 14 can change the elastic force of the elastic element 16. By changing the elastic force of the elastic element 16, the attraction force of the permanent magnet 5 to the armature body 21 through the yoke magnet 4 can be changed. In addition, the gap between the permanent magnet 5 and the armature body 21 will generate magnetic resistance. The size of the gap between the magnet 5 and the armature 2 can also change the size of the magnetic resistance. The smaller the magnetic resistance, the greater the attraction force, and vice versa. Changing the volume of the permanent magnet 5 can also change the attraction force of the permanent magnet 5. Through the above multiple methods, the attraction force of the permanent magnet 5 can be changed, so that the trip device can be used in different environments.

[0054] Please see Figure 13-19 In this embodiment, the armature 2 includes an armature body 21. The armature body 21 has a bent part 23 in the middle of one end near the elastic member 16, and the top of the elastic member 16 is engaged with the bent part 23 by a hook. The armature body 21 has grooves 22 on both sides of one end near the bent part 23, and the concave surface of the groove 22 of the armature body 21 is rotatably connected to the top of the fixing member 11.

[0055] The top of the fixing member 11 is provided with two protruding plates, and the two protruding plates are rotatably connected to the concave surfaces of the two grooves 22 of the armature body 21 respectively; the upper end of one of the two protruding plates is bent inward and forms an L shape, and the two protruding plates are respectively located in the two grooves 22;

[0056] By adopting the above technical solution, a coil is sleeved on the outer side of the coil frame column 64. Under normal conditions, the armature body 21 is attracted to the permanent magnet 5 by the magnetic force of the yoke 4 and is completely fitted into the inner groove of the upper groove 61. At the same time, the bending member 23 at the end of the armature body 21 stretches the elastic member 16, keeping the elastic member 16 in a stable and taut state. When a short circuit occurs, or the current through the circuit breaker reaches or exceeds the instantaneous current setting value, the magnetic field generated by the yoke inside the coil ring overcomes the magnetic field generated by the permanent magnet 5. The attraction effect of this magnetic field on the armature body 21 is less than the tension of the elastic member 16 on the armature body 21. The pulling effect occurs when the elastic element 16 pulls the armature body 21, causing it to rotate away from the permanent magnet 5 around the connection point with the fixing element 11. During this movement, the armature body 21 pushes the push rod 3, causing it to move upwards. This allows the circuit breaker tripping device to trip the circuit breaker. This is an existing technology, and its connection and operation principles will not be elaborated here. The permanent magnet 5 has strong magnetism and can generate sufficient magnetic field strength. This magnetic field strength is crucial for realizing the function of the tripping device because it can ensure that the tripping device can maintain stable performance and reliable tripping effect when facing various working environments and conditions.

[0057] Please see Figure 14-15 , Figure 17 In this embodiment, the yoke 4 includes two yoke bodies 41, and the two yoke bodies 41 are fixedly connected to each other as a whole; both ends of the yoke body 41 are provided with protruding posts, and the yoke body 41 is generally U-shaped; the yoke body 41 is fixedly connected to the permanent magnet 5, and the permanent magnet 5 is located between the two protruding posts of the yoke body 41; the fixing member 11 is sleeved on the outside of the protruding post of the yoke body 41 near the end close to the elastic member 16.

[0058] By adopting the above technical solution, both the armature body 21 and the yoke body 41 are made by punching technology, so that the structure of the armature body 21 and the yoke body 41 is straight, ensuring that the internal structure of the armature body 21 and the yoke body 41 will not be damaged, thereby ensuring that the magnetic circuit system in the trip unit is not bent and that the magnetic circuit system always remains stable; in addition, the rotation fulcrum where the armature body 21 contacts the yoke body 41 is set in an arc shape, which can reduce the damage caused by the friction between the armature body 21 and the yoke body 41 when the armature body 21 rotates; one of the protrusions on the top of the fixing member 11 is bent inward and forms an L shape, which can limit the rotation angle of the armature and prevent the rotation amplitude of the armature body 21 from being too large, and together with the two grooves 22, can prevent the armature from shifting and causing displacement.

[0059] Please see Figure 1-13 In this embodiment, the yoke 4 is provided with a lower outer shell 7 on its outer side, which is snapped into the upper outer shell 8; the elastic device 1, armature 2, push rod 3, yoke 4, permanent magnet 5 and positioning component 6 are all located in the internal space after the lower outer shell 7 and the upper outer shell 8 are connected.

[0060] The upper outer shell 8 includes an upper shell 81, on both sides of the lower end of the upper shell 81, a plurality of slots 82 are provided; the top of the upper outer shell 8 is provided with a movable hole 83, the position of the movable hole 83 corresponds to the position of the push rod 3, and the diameter of the movable hole 83 is larger than the diameter of the upper end of the push rod 3; the upper end of the push rod 3 is cylindrical and the lower end is umbrella-shaped.

[0061] The lower outer shell 7 includes a lower shell 71. Multiple locking blocks 72 are provided on both sides of the upper end of the lower shell 71, and the positions of the multiple locking blocks 72 correspond to the positions of multiple locking slots 82. An operating hole 73 is provided at one bottom end of the lower shell 71, and the position of the operating hole 73 corresponds to the position of the screw 13. Two rectangular holes 74 are symmetrically provided at the end of the lower shell 71 away from the operating hole 73, and the positions of the two rectangular holes 74 correspond to the positions of two pins 9. The end of the pin 9 away from the lower groove 65 extends to the lower bottom of the lower shell 71 through the rectangular holes 74. Multiple locking blocks 75 are provided on the upper ends of both sides of the interior of the lower shell 7, and the positions of the multiple locking blocks 75 correspond to the positions of multiple locking slots 66.

[0062] By adopting the above technical solution, the lower housing 71 is engaged with the upper housing 81 through multiple locking blocks 72, and at the same time, the lower housing 71 is engaged with the upper groove 61 through multiple locking blocks 72. After the lower housing 71 and the upper housing 81 are engaged and fixed, there is a misaligned contact surface at the joint between the lower housing 71 and the upper housing 81. The misaligned contact surface can play a sealing role, preventing external dust from entering the interior of the lower housing 71 and the upper housing 81 through the gap at the connection between the lower housing 71 and the upper housing 81, thereby ensuring the stability of the magnetic circuit system inside the lower housing 71 and the upper housing 81.

[0063] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A miniature electromagnetic trip unit, characterized in that: It includes a yoke (4), one side of which is fixedly connected to the coil frame component (6) and the other side is fixedly connected to the elastic device (1); an armature (2) is provided above the yoke (4), and the top of the armature (2) is in contact with the bottom of the push rod (3); The elastic device (1) includes a fixing member (11), and a connecting member (12) is fixedly connected to the lower end of the fixing member (11) away from the positioning member (6). The bottom of the connecting member (12) is rotatably connected to the stud (13). A movable member (14) is sleeved on the upper end of the stud (13). The movable member (14) is C-shaped, and a nut (15) is provided on the inner side of the movable member (14). The nut (15) is threadedly connected to the stud (13). A rectangular groove is provided on the inner side of the connecting member (12). The stud (13), the movable member (14), and the nut (15) are all located in the rectangular groove of the connecting member (12). An elastic member (16) is provided on the connecting member (12) away from the fixing member (11). The top and bottom of the elastic member (16) are provided with hooks, and the bottom of the elastic member (16) is engaged with the end of the movable member (14) through the hooks. The armature (2) includes an armature body (21), which has a bent part (23) in the middle of one end near the elastic member (16), and the top of the elastic member (16) is engaged with the bent part (23) by a hook; the armature body (21) has grooves (22) on both sides of one end near the bent part (23), and the concave surface of the groove (22) of the armature body (21) is rotatably connected to the top of the fixing member (11).

2. The miniature electromagnetic trip unit as described in claim 1, characterized in that: The fastener (11) has two protruding plates on its top, and the two protruding plates are rotatably connected to the concave surfaces of the two grooves (22) of the armature body (21); the upper end of one of the two protruding plates is bent inward and forms an L shape, and the two protruding plates are located in the two grooves (22) respectively.

3. The miniature electromagnetic trip unit as described in claim 2, characterized in that: The yoke (4) includes two yoke bodies (41), and the two yoke bodies (41) are fixedly connected to each other as a whole; both ends of the yoke body (41) are provided with protruding posts, and the yoke body (41) is in the shape of a U; the yoke body (41) is fixedly connected to a permanent magnet (5), and the permanent magnet (5) is located between the two protruding posts of the yoke body (41); the fixing member (11) is sleeved on the outside of the protruding post of the yoke body (41) near the end of the elastic member (16).

4. The miniature electromagnetic trip unit as described in claim 3, characterized in that: The coil frame component (6) includes a column (64), which is sleeved on the outside of the protrusion of the yoke body (41) away from the fixing member (11); the top of the column (64) is fixedly connected to the upper groove (61) and the bottom is fixedly connected to the lower groove (65); a through groove (62) is provided in the middle of the column (64), which passes through the upper groove (61), the column (64) and the lower groove (65), and the protrusion of the yoke body (41) is located in the through groove (62).

5. The miniature electromagnetic trip unit as described in claim 4, characterized in that: The upper groove (61) has a through groove (63) at one end away from the through groove (62), which corresponds to the position of the permanent magnet (5); the lower groove (65) has coil pins (9) fixedly connected to both sides of its lower end, and the coil pins (9) are L-shaped; the upper groove (61) has an inner groove at the top, which corresponds to the position of the armature body (21), and the width of the inner groove of the upper groove (61) is greater than the width of the armature body (21); the lower groove (65) has an inner groove at the bottom, and the two yoke bodies (41) are located in the inner groove of the lower groove (65); the upper groove (61) has multiple slots (66) on both sides.

6. The miniature electromagnetic trip unit as described in claim 5, characterized in that: The yoke (4) is provided with a lower outer shell (7) on its outer side, which is snapped into the upper outer shell (8); the elastic device (1), armature (2), push rod (3), yoke (4), permanent magnet (5) and coil frame component (6) are all located in the internal space after the lower outer shell (7) and the upper outer shell (8) are connected.

7. The miniature electromagnetic trip unit as described in claim 6, characterized in that: The upper outer shell (8) includes an upper shell (81), which has multiple slots (82) on both sides of its lower end; the top of the upper outer shell (8) has a movable hole (83), the position of which corresponds to the position of the push rod (3), and the diameter of the movable hole (83) is larger than the diameter of the upper end of the push rod (3); the upper end of the push rod (3) is cylindrical and the lower end is umbrella-shaped.

8. The miniature electromagnetic trip unit as described in claim 7, characterized in that: The lower outer shell (7) includes a lower shell (71), on both sides of the upper end of the lower shell (71) are provided with multiple locking blocks (72), and the positions of the multiple locking blocks (72) correspond to the positions of multiple locking slots (82); one end of the bottom of the lower shell (71) is provided with an operating hole (73), the position of the operating hole (73) corresponds to the position of the stud (13); two rectangular holes (74) are symmetrically provided at the end of the lower shell (71) away from the operating hole (73), the positions of the two rectangular holes (74) correspond to the positions of the two coil pins (9), and the end of the coil pin (9) away from the lower groove (65) extends to the lower shell (71) through the rectangular holes (74); multiple locking blocks (75) are provided at the upper ends of both sides of the interior of the lower shell (7), and the positions of the multiple locking blocks (75) correspond to the positions of multiple locking slots (66).

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