Miniature circuit breaker

Abstract

A miniature circuit breaker comprises a first housing, the inner wall of the first housing is provided with a first reinforcing rib and a second reinforcing rib, and the distance L5 between the first reinforcing rib and the second reinforcing rib is matched with the length L1 of an iron core assembly provided with a magnet yoke; a third reinforcing rib and a fourth reinforcing rib are arranged on the inner wall of the second shell; the inner sides of the iron core assembly and the third reinforcing rib extend towards the iron core assembly to form limiting pieces, the thickness of the limiting pieces is matched with the thickness L3 of the magnet yoke, and when the first shell is matched with the second shell, the limiting pieces make contact with the end face of the second end of the iron core assembly. By means of the distance between the reinforcing ribs on the two shells, the shell on one side can be matched with the magnet yoke and the iron core assembly, the limiting piece is used for making up the thickness of the magnet yoke on the other side, and therefore assembling of the magnet yoke can be met, and installing of the iron core assembly without the magnet yoke can be achieved in a matched mode. And the limiting piece is used for limiting the left-right movement of the iron core assembly.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of low voltage apparatus, concretely relates to a small circuit breaker. BACKGROUND

[0002] The electromagnetic mechanism of the small circuit breaker provides instantaneous current protection and short-circuit current protection, mainly adopts electromagnetic tripping structure. The electromagnetic tripping structure is generally composed of a coil, a magnetic yoke, a coil framework, a moving iron core, a static iron core, an iron core spring and a top rod, and the moving iron core and the top rod are fixed together.

[0003] Under instantaneous current and short-circuit current, the coil generates a large electromagnetic force, drives the moving iron core to move towards the static iron core, thus the moving iron core drives the top rod to move, the movement of the top rod releases the tripping of the operating mechanism, and the small circuit breaker disconnects the circuit. The larger the cross-sectional area of the moving iron core and the static iron core, the larger the electromagnetic force generated by the coil, and the smaller the cross-sectional area, the smaller the electromagnetic force.

[0004] However, with the cost compression, the magnetic yoke is omitted for the small circuit breaker, which does not affect the overall tripping effect, but the magnetic yoke also has the effect of better fixing the electromagnetic tripping structure. SUMMARY

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a small circuit breaker.

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

[0007] A small circuit breaker comprises:

[0008] A first shell is provided with a first reinforcing rib and a second reinforcing rib on the inner wall, and the distance L5 between the first reinforcing rib and the second reinforcing rib is matched with the length L1 of the iron core assembly provided with the magnetic yoke;

[0009] A second shell is provided with a third reinforcing rib and a fourth reinforcing rib on the inner wall, and the fourth reinforcing rib is arranged correspondingly to the second reinforcing rib, and the third reinforcing rib is arranged correspondingly to the first reinforcing rib;

[0010] An iron core assembly is provided with a coil assembly on the outer side,

[0011] When the first shell and the second shell are matched, the second reinforcing rib and the fourth reinforcing rib match to clamp the first end of the iron core assembly, the third reinforcing rib and the first reinforcing rib match to clamp the second end of the iron core assembly, and the inner side of the third reinforcing rib extends a limiting piece towards the direction of the iron core assembly, and the thickness of the limiting piece is matched with the thickness L3 of the magnetic yoke, and when the first shell and the second shell are matched, the limiting piece is in contact with the end face of the second end of the iron core assembly.

[0012] The side of the limiting piece towards the first shell is a bevel.

[0013] The first reinforcing rib, the second reinforcing rib, the third reinforcing rib and the fourth reinforcing rib are all provided with a semicircular clasp.

[0014] The iron core assembly comprises:

[0015] A coil framework which is a hollow column and has two open ends;

[0016] A static iron core which is detachably connected with one end of the coil framework;

[0017] A dynamic iron core which is movably arranged in the cavity of the coil framework and has an end abutting against the other end of the coil framework;

[0018] A top rod which has one end arranged through the static iron core and the other end abutting against the side of the dynamic iron core towards the static iron core;

[0019] A spring which is sleeved outside the top rod and has one end abutting against the static iron core and the other end abutting against the top rod.

[0020] The first reinforcing rib and the third reinforcing rib match to clamp the static iron core exposed from the coil framework, and the second reinforcing rib and the fourth reinforcing rib match to clamp the first end of the coil framework.

[0021] The static iron core comprises an inserting part and a clamping part arranged coaxially, and a limiting part is arranged between the inserting part and the clamping part, and one end of the limiting piece abuts against the side of the limiting part towards the clamping part.

[0022] The utility model discloses beneficial effects: utilize the distance setting between each reinforcing rib on two shells, so that one side shell can adapt to the magnetic yoke plus iron core assembly, and the other side utilizes the limiting piece to make up the thickness of the magnetic yoke, and then it can satisfy the assembly of the magnetic yoke, and can also match the installation of the iron core assembly without the magnetic yoke, and utilize the limiting piece to limit the left and right movement of the iron core assembly. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the cross section schematic diagram of the utility model.

[0024] Figure 2Another direction of the cross section of the utility model is shown.

[0025] Figure 3 The structure diagram of the iron core assembly of the utility model is shown.

[0026] Figure 4 The structure diagram of the iron core assembly of the utility model is shown.

[0027] Figure 5 The structure diagram of the second shell of the utility model is shown.

[0028] Figure 6 The structure diagram of the first shell of the utility model is shown.

[0029] Figure 7 The cross section of the iron core assembly of the utility model is shown. Specific implementation

[0030] The technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0031] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications also change accordingly.

[0032] The utility model provides a kind of miniature circuit breaker, it includes mutually matched first shell 100 and second shell 200, and the structure inside circuit breaker is fixed by being clamped to two, by being set with corresponding reinforcing rib on first shell and second shell, by the distance between reinforcing rib, the restriction to iron core assembly left and right movement is realized, left and right movement refers to the movement of iron core assembly along its axis direction.

[0033] As Figure 1 And Figure 6 Indicated, first shell 100, first reinforcing rib 110 and second reinforcing rib 120 are equipped on its inner wall, and the distance L5 between the first reinforcing rib 110 and the second reinforcing rib 120 is adapted to the length L1 of the iron core assembly with magnetic yoke, wherein the length L1 of the iron core assembly with magnetic yoke is as shown in Figure 3

[0034] As Figure 2 And Figure 5 ​As shown, the second shell 200 is provided with a third reinforcing rib 210 and a fourth reinforcing rib 220 on the inner wall, and the fourth reinforcing rib 220 is arranged corresponding to the second reinforcing rib 120, and the third reinforcing rib 210 is arranged corresponding to the first reinforcing rib 110, wherein the distance L6 between the third reinforcing rib 210 and the fourth reinforcing rib is equal to the distance L5 between the first reinforcing rib 110 and the second reinforcing rib 120, and the two distances are consistent, thereby clamping the core assembly in pairs;

[0035] The core assembly 300 is wrapped with a coil assembly on the outer side,

[0036] When the first shell 100 and the second shell 200 are matched, the second reinforcing rib 120 and the fourth reinforcing rib 220 clamp the first end 301 of the core assembly 300, the third reinforcing rib 210 and the first reinforcing rib 110 clamp the second end 302 of the core assembly 300, and the inner side of the third reinforcing rib 210 extends to a limiting piece 230 in the direction of the core assembly 300, and the thickness of the limiting piece 230 is matched with the thickness L3 of the magnetic yoke, and when the first shell 100 and the second shell 200 are matched, the limiting piece 230 is in contact with the end face of the second end 302 of the core assembly 300.

[0037] The limiting piece can be directly realized by thickening the third reinforcing rib, or realized by a protrusion on the third reinforcing rib.

[0038] That is, the distance L4 from the limiting piece 230 to the fourth reinforcing rib is matched with the length L2 of the core assembly, and the length L2 of the core assembly is shown in Figure 4 , preferably L1=L2+L3, and L4=L2, L6=L5=L1.

[0039] The side of the limiting piece 230 facing the first shell 100 is a bevel, and when the first shell and the second shell are matched, the existence of the bevel can push the core assembly to the direction of the second reinforcing rib, and when there is no magnetic yoke, the installation and positioning of the core assembly can be completed by relying on the bevel.

[0040] The first reinforcing rib 110, the second reinforcing rib 120, the third reinforcing rib 210 and the fourth reinforcing rib 220 are all provided with a semicircular clasp, and two semicircular clasps are arranged opposite to each other to form a circle matched with the shape of the core assembly, thereby clamping and fixing the core assembly.

[0041] As shown in the figure, Figure 7 The core assembly 300 comprises:

[0042] The coil skeleton is a hollow column, and the two ends are open;

[0043] The static core 310 is detachably connected to one end of the coil skeleton;

[0044] The movable iron core 320 is movably arranged in the cavity of the coil former, and the end of the movable iron core 320 is abutted against the other end of the coil former;

[0045] The top rod 330 is arranged through the static iron core 310, and the other end of the top rod 330 is abutted against the side of the movable iron core 320 facing the static iron core 310;

[0046] The spring is sleeved outside the top rod 330, and one end of the spring is abutted against the static iron core 310, and the other end of the spring is abutted against the top rod 330. The spring is not shown in the figure.

[0047] The first reinforcing rib 110 and the third reinforcing rib 210 clamp the static iron core 310 exposed from the coil former, and the second reinforcing rib 120 and the fourth reinforcing rib 220 clamp the first end of the coil former. The clamping of the front and rear ends preliminarily limits the two ends of the iron core assembly. If there is a magnetic yoke, the magnetic yoke can be placed between the iron core assembly and the first reinforcing rib. If there is no magnetic yoke, the limiting member on the other side replaces the magnetic yoke to further limit the two ends of the iron core assembly. The inclined surface design of the limiting member avoids the magnetic yoke, so that the installation of the magnetic yoke is not affected by the limiting member.

[0048] The static iron core 310 comprises a clamping portion 312 and an insertion portion 311 arranged coaxially, and a limiting portion 313 is arranged between the clamping portion 312 and the insertion portion 311. One end of the limiting member 230 is abutted against the side of the limiting portion 313 facing the clamping portion 312. The abutment of the limiting member on the outer end surface of the static iron core realizes the limiting of the iron core assembly in the axial direction.

[0049] The embodiments should not be regarded as a limitation of the utility model, but any improvement based on the spirit of the utility model should be within the protection scope of the utility model.

Claims

1. A miniature circuit breaker, characterized by: It includes: The first shell (100) is provided with a first reinforcing rib (110) and a second reinforcing rib (120) on the inner wall, and the distance L5 between the first reinforcing rib (110) and the second reinforcing rib (120) is matched with the length L1 of the core assembly provided with a magnetic yoke; The second shell (200) is provided with a third reinforcing rib (210) and a fourth reinforcing rib (220) on the inner wall, and the fourth reinforcing rib (220) is correspondingly arranged with the second reinforcing rib (120), and the third reinforcing rib (210) is correspondingly arranged with the first reinforcing rib (110); The core assembly (300) is provided with a coil assembly on the outer side, When the first shell (100) and the second shell (200) are matched, the second reinforcing rib (120) and the fourth reinforcing rib (220) are matched to clamp the first end (301) of the core assembly (300), the third reinforcing rib (210) and the first reinforcing rib (110) are matched to clamp the second end (302) of the core assembly (300), and the inner side of the third reinforcing rib (210) extends to a limiting piece (230) in the direction of the core assembly (300), and the thickness of the limiting piece (230) is matched with the thickness L3 of the magnetic yoke, and when the first shell (100) and the second shell (200) are matched, the limiting piece (230) is in contact with the end face of the second end (302) of the core assembly (300).

2. A miniature circuit breaker according to claim 1, characterized in that: The side of the limiting piece (230) facing the first shell (100) is a slope.

3. A miniature circuit breaker according to claim 1 or 2, characterized in that: The first reinforcing rib (110), the second reinforcing rib (120), the third reinforcing rib (210) and the fourth reinforcing rib (220) are all provided with a semicircular clasp.

4. A miniature circuit breaker according to claim 1, characterized in that: The core assembly (300) includes: The coil skeleton is a hollow column, and both ends are open; The static core (310) is detachably connected with one end of the coil skeleton; The dynamic core (320) is movably arranged in the cavity of the coil skeleton, and the distal end is abutted with the other end of the coil skeleton; The top rod (330) is arranged through the static core (310) at one end, and is abutted with the side of the dynamic core (320) facing the static core (310) at the other end; The spring is sleeved on the outer side of the top rod (330), and one end is abutted with the static core (310) and the other end is abutted with the top rod (330).

5. A miniature circuit breaker according to claim 4, characterized in that: The first reinforcing rib (110) and the third reinforcing rib (210) clamp the static core (310) exposed from the coil skeleton, and the second reinforcing rib (120) and the fourth reinforcing rib (220) clamp the first end of the coil skeleton.

6. A miniature circuit breaker according to claim 4, characterized in that: The static core (310) includes a plug-in part (311) and a clamping part (312) arranged coaxially, and a limiting part (313) is arranged between the plug-in part (311) and the clamping part (312), and one end of the limiting piece (230) is abutted on one side of the limiting part (313) facing the clamping part (312).

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