Economical miniature circuit breaker

Abstract

The utility model discloses an economical miniature circuit breaker. The problems that an existing circuit breaker is complex in structure, troublesome to install and high in production cost are solved. The arc extinguishing device comprises a shell and further comprises an arc extinguishing chamber, the arc extinguishing chamber comprises an arc extinguishing frame and an arc extinguishing grid sheet, and the arc extinguishing grid sheet is provided with an arc extinguishing notch; a coil is wound on the outer side of the tripping device; a static contact piece, wherein the coil is welded with the static contact piece; the static contact piece comprises an arc striking part, the arc striking part is arranged in front of the arc extinguishing grid piece, and the projection of the end part of the static contact piece on the plane falls into the arc extinguishing notch of the arc extinguishing grid piece; and the arc striking piece is arranged on the shell, is attached to the static contact piece and extends to the upper part of the arc extinguish chamber from the arc striking part. According to the utility model, the arc striking sheet is arranged, so that arc striking at the static contact sheet is facilitated, arrangement of a magnet yoke is avoided, parts are reduced, and the cost is reduced; and the release is arranged, and the coil is directly wound outside the release and is welded with the static contact piece, so that the coil is prevented from being welded with the release frame, and the mounting structure is simplified.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly to an economical miniature circuit breaker. Background Art

[0002] A miniature circuit breaker (English name: Miniature Circuit Breaker), also known as a micro circuit breaker (Micro Circuit Breaker), is applicable to the overload and short-circuit protection of low-voltage lines, and can also be used for the infrequent operation conversion of the line under normal circumstances. Miniature circuit breakers are mainly used in various places such as industry, commerce, high-rise buildings, and civil residences. A miniature circuit breaker generally includes a housing, an operating mechanism, a tripping system, a contact system, an arc extinguishing system, etc. By operating the operating handle, the operating mechanism drives the moving contact in the contact system to move, so that the miniature circuit breaker is switched on and off to realize the control of the electrical circuit; by sensing the thermal effect and magnetic effect of the current, protection is implemented when faults such as overload and short circuit occur in the electrical circuit. During the breaking process of the moving contact and the static contact, an arc will be generated. The arc is usually led to the arc extinguishing chamber of the arc extinguishing system through the arc guiding piece. When the arc enters the arc extinguishing chamber, it is separated into many segments by the metal grid pieces in the arc extinguishing chamber. Each segment of the arc generates a near-pole voltage near the metal grid piece, which rapidly increases the voltage drop of the entire arc and extinguishes the arc. However, different scenarios require different breaking capacities for circuit breakers. High-breaking-capacity circuit breakers are more complex in structure, with high requirements for product quality and precision, resulting in high production costs. For example, the existing miniature circuit breaker trip unit is usually of an integral structure and requires multiple weldings. After being welded to the terminal and the static contact piece, it is integrally installed in the housing, making the product difficult to process and assemble. In order to improve the arc guiding and extinguishing performance of the existing product, a magnetic yoke is usually set to increase the arc guiding efficiency. At the same time, the arc extinguishing grid pieces are usually set to 13 pieces or more, which occupies the space inside the housing and also increases the production cost of the product. The structure at the existing terminal is relatively complex, resulting in high production costs of the product. Summary of the Utility Model

[0003] In order to solve the problems of the complex structure, troublesome installation, and high production cost of the existing circuit breaker in the background art, the utility model provides an economical miniature circuit breaker.

[0004] The technical solution of the utility model is: an economical miniature circuit breaker, including a housing, and further including:

[0005] A moving contact piece, arranged inside the housing;

[0006] An arc extinguishing chamber, arranged inside the housing, the arc extinguishing chamber including an arc extinguishing frame and arc extinguishing grid pieces, and the arc extinguishing grid pieces are provided with arc extinguishing notches;

[0007] The release is provided on the housing, and a coil is wound around the release.

[0008] The static contact is provided inside the housing, and the coil is welded to the static contact; the moving contact has a first position in contact with the static contact and a second position separated from the static contact; the static contact includes an arc guiding portion, the arc guiding portion is provided in front of the arc extinguishing grid piece, and the projection of the end of the static contact on the plane falls within the arc extinguishing notch of the arc extinguishing grid piece.

[0009] The arc guiding piece is provided on the housing and is in contact with the static contact and extends from the arc guiding portion to above the arc extinguishing chamber.

[0010] As a further improvement of the present utility model, there are 12 arc extinguishing grid pieces, and each arc extinguishing grid piece is provided with the arc extinguishing notch. Different arc extinguishing grid pieces are arranged in parallel and the arc extinguishing notches are correspondingly arranged.

[0011] As a further improvement of the present utility model, the static contact is provided with a connecting portion, the connecting portion is connected to the arc guiding portion through an arc portion, the connecting portion, the arc portion and the connecting portion cooperate with each other to form a V-shaped groove, the arc guiding piece is inserted into the V-shaped groove and is provided with a V-shaped portion adapted to the V-shaped groove.

[0012] As a further improvement of the present utility model, the housing is provided with a support block, the static contact is provided with a bending block, the bending block is placed on the support block, and the coil is welded to the bending block.

[0013] As a further improvement of the present utility model, it further includes a limit block. The housing is provided with a mounting block, the release is placed on the mounting block, the limit block is inserted into the housing and cooperates with the mounting block to limit the release, and the limit block and the mounting block are detachably engaged.

[0014] As a further improvement of the present utility model, it further includes an incoming line terminal provided on the housing for connecting with an external wire; an incoming line board is provided on the incoming line terminal, and the coil is welded to the incoming line board.

[0015] As a further improvement of the present utility model, the housing is provided with a baffle, the baffle separates the incoming line board from the arc extinguishing chamber, and an air flow channel is provided between the arc extinguishing chamber and the baffle.

[0016] As a further improvement of the present utility model, the incoming line board is provided with a vertical portion, the vertical portion is attached to the baffle, and the vertical portion is provided with a hollow hole.

[0017] As a further improvement of the present utility model, it further includes an outgoing line terminal provided on the housing for connecting with an external wire; an outgoing line board is provided on the outgoing line terminal, and the outgoing line board is connected to the bimetal sheet.

[0018] As a further improvement of the utility model, a horizontal part is provided on the wire outlet board, and a riveting bump facilitating welding with a bimetal sheet is provided on the horizontal part.

[0019] The beneficial effects of the utility model are as follows: an arc ignition piece is provided to facilitate arc ignition at the static contact piece, the setting of the yoke is avoided, the number of components is reduced, and the cost is lowered; a release is provided, and the coil is directly wound outside the release and welded to the static contact piece, avoiding the welding of the coil to the release holder, and simplifying the installation structure. The utility model also has the advantages of simple structure, convenient assembly, reliable operation, long service life, etc. Description of the Drawings

[0020] Attached Figure 1 is a schematic structural diagram of an embodiment of the utility model.

[0021] Attached Figure 2 is a schematic structural diagram inside the housing of an embodiment of the utility model.

[0022] Attached Figure 3 is Figure 2 an exploded structural diagram of

[0023] Attached Figure 4 is an exploded structural diagram of the release of an embodiment of the utility model.

[0024] Attached Figure 5 is a schematic structural diagram of the wire outlet board of an embodiment of the utility model.

[0025] In the figures, 1. housing; 11. support block; 12. limit block; 13. mounting block; 14. baffle; 15. air flow channel; 2. moving contact piece; 3. arc extinguishing chamber; 31. arc extinguishing frame; 32. arc extinguishing grid piece; 33. arc extinguishing notch; 4. release; 41. coil; 5. static contact piece; 51. arc ignition part; 52. connecting part; 53. arc part; 54. V-shaped groove; 55. bending block; 6. arc ignition piece; 61. V-shaped part; 7. incoming line terminal; 71. incoming line board; 711. vertical part; 712. hollow hole; 8. outgoing line terminal; 81. wire outlet board; 811. horizontal part; 812. riveting bump; 9. bimetal sheet. Detailed Embodiment

[0026] The following further describes the embodiments of the utility model with reference to the drawings:

[0027] As Figure 1 Combined Figures 2-5 shown, an economical miniature circuit breaker includes a housing 1, and further includes:

[0028] A moving contact piece 2, which is arranged inside the housing 1;

[0029] The arc extinguishing chamber 3 is arranged inside the housing 1. The arc extinguishing chamber 3 includes an arc extinguishing frame 31 and arc extinguishing grid plates 32, and arc extinguishing notches 33 are provided on the arc extinguishing grid plates 32.

[0030] The release 4 is arranged on the housing 1, and a coil 41 is wound around the release 4.

[0031] The static contact piece 5 is arranged inside the housing 1, and the coil 41 is welded to the static contact piece 5. The moving contact piece 2 has a first position in contact with the static contact piece 5 and a second position separated from the static contact piece 5. The static contact piece 5 includes an arc ignition part 51, and the arc ignition part 51 is arranged in front of the arc extinguishing grid plates 32, and the projection of the end of the static contact piece on the plane falls within the arc extinguishing notches 33 of the arc extinguishing grid plates 32.

[0032] The arc ignition piece 6 is arranged on the housing 1 in contact with the static contact piece and extends from the arc ignition part 51 to be arranged above the arc extinguishing chamber 3. The beneficial effect of the present utility model is that the arc ignition piece is provided, which is convenient for arc ignition at the static contact piece, avoids the setting of the yoke, reduces the number of components, and reduces the cost; the release is provided, and the coil is directly wound around the release and welded to the static contact piece, avoiding the welding of the coil to the release frame, and simplifying the installation structure. The present utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life.

[0033] There are 12 arc extinguishing grid plates 32, and the arc extinguishing notches 33 are provided on each arc extinguishing grid plate 32. Different arc extinguishing grid plates 32 are arranged in parallel and the arc extinguishing notches 33 are arranged correspondingly. The number of arc extinguishing grid plates is reduced, the production cost is reduced, the space inside the housing is reasonably utilized, the air circulation is increased, and the arc extinguishing performance is improved.

[0034] A connecting part 52 is provided on the static contact piece 5. The connecting part 52 and the arc ignition part 51 are connected through an arc part 53. The connecting part 52, the arc part 53 and the connecting part 52 cooperate with each other to form a V-shaped groove 54. The arc ignition piece 6 is inserted into the V-shaped groove 54 and is provided with a V-shaped part 61 adapted to the V-shaped groove 54. Such a structure avoids the setting of the yoke, reduces the cost, and the setting of the arc ignition piece and the V-shaped part enables the generated arc to be quickly introduced into the arc extinguishing chamber, improving the arc extinguishing performance.

[0035] A support block 11 is provided on the housing 1. A bending block 55 is provided on the static contact piece 5. The bending block 55 is placed on the support block 11, and the coil 41 is welded to the bending block 55. Such a structure is convenient for the installation of the static contact piece. After the static contact piece is installed, the coil can be welded inside the housing, avoiding the overall installation and welding of the static contact piece and the release, simplifying the assembly, and reducing the assembly cost.

[0036] The utility model further includes a limiting block 12. An installation block 13 is provided on the housing. The release 4 is placed on the installation block 13. The limiting block 12 is inserted into the housing 1 and cooperates with the installation block 13 to limit the release 4. The limiting block 12 and the installation block 13 are detachably matched. Such a structure facilitates the installation of the release, avoids the integrated installation of the release with the coil, static contact piece and incoming line terminal, has a simple structure, is convenient for assembly, and reduces the assembly cost.

[0037] The utility model further includes an incoming line terminal 7, which is provided on the housing 1 and used for connecting with an external wire; an incoming line board 71 is provided on the incoming line terminal 7, and the coil 41 is welded to the incoming line board 71. Such a structure reduces the length of the incoming line board and reduces the cost.

[0038] A baffle 14 is provided on the housing 1. The baffle 14 separates the incoming line board 71 from the arc extinguishing chamber 3, and an air flow channel 15 is provided between the arc extinguishing chamber 3 and the baffle 14. The setting of the air flow channel facilitates the discharge of hot air and improves the breaking performance.

[0039] A vertical portion 711 is provided on the incoming line board 71. The vertical portion 711 is attached to the baffle 14, and a hollow hole 712 is provided on the vertical portion 711. The setting of the vertical portion makes the installation of the incoming line board reliable and not easy to swing. The setting of the hollow hole plays a role in saving materials and reduces the production cost.

[0040] The utility model further includes an outgoing line terminal 8, which is provided on the housing 1 and used for connecting with an external wire; an outgoing line board 81 is provided on the outgoing line terminal 8, and the outgoing line board 81 is connected to the bimetal 9. Specifically, a horizontal portion 811 is provided on the outgoing line board 81, and a riveting convex block 812 convenient for welding with the bimetal 9 is provided on the horizontal portion 811. The setting of the outgoing line board reduces the material and the cost. The setting of the riveting convex block enables reliable welding even if there are welding spots on the welding plane, the welding is firm, and reliable connection with the bimetal is achieved.

[0041] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise stated, the meaning of "a plurality of" is two or more than two.

[0043] All technicians should note that although the present utility model has been described according to the above specific embodiments, the inventive concept of the present utility model is not limited to this utility model alone. Any modification using the inventive concept of the present utility model will be included in the scope of protection of the patent right of the present utility model.

Claims

1. An economical miniature circuit breaker, comprising a housing (1), characterized in that : Further included are: A moving contact piece (2), disposed inside the housing (1); An arc extinguishing chamber (3), disposed inside the housing (1), the arc extinguishing chamber (3) includes an arc extinguishing frame (31) and arc extinguishing grid pieces (32), and arc extinguishing notches (33) are provided on the arc extinguishing grid pieces (32); A release (4), disposed on the housing (1), and a coil (41) is wound around the release (4); A static contact piece (5), disposed inside the housing (1), and the coil (41) is welded to the static contact piece (5); the moving contact piece (2) has a first position in contact with the static contact piece (5) and a second position separated from the static contact piece (5); the static contact piece (5) includes an arc guiding portion (51), the arc guiding portion (51) is disposed in front of the arc extinguishing grid pieces (32), and the projection of the end of the static contact piece on the plane falls within the arc extinguishing notches (33) of the arc extinguishing grid pieces (32); An arc guiding piece (6), disposed on the housing (1) in contact with the static contact piece and extending from the arc guiding portion (51) to be disposed above the arc extinguishing chamber (3).

2. The economy type miniature circuit breaker according to claim 1, characterized in that There are 12 arc extinguishing grid pieces (32), and the arc extinguishing notches (33) are provided on each arc extinguishing grid piece (32). Different arc extinguishing grid pieces (32) are arranged in parallel and the arc extinguishing notches (33) are arranged correspondingly.

3. An economical miniature circuit breaker according to claim 1, characterized in that A connecting portion (52) is provided on the static contact piece (5), the connecting portion (52) is connected to the arc guiding portion (51) through an arc portion (53), and the connecting portion (52), the arc portion (53) and the connecting portion (52) cooperate with each other to form a V-shaped groove (54). The arc guiding piece (6) is inserted into the V-shaped groove (54) and is provided with a V-shaped portion (61) adapted to the V-shaped groove (54).

4. An economical miniature circuit breaker according to claim 1, characterized in that A support block (11) is provided on the housing (1), a bending block (55) is provided on the static contact piece (5), the bending block (55) is placed on the support block (11), and the coil (41) is welded to the bending block (55).

5. An economical miniature circuit breaker according to claim 1, characterized in that A limit block (12) is further included. An installation block (13) is provided on the housing. The release (4) is placed on the installation block (13). The limit block (12) is inserted into the housing (1) to cooperate with the installation block (13) to limit the release (4), and the limit block (12) is detachably engaged with the installation block (13).

6. The economical miniature circuit breaker according to claim 1, wherein An incoming line terminal (7) is further included, disposed on the housing (1) for connecting with an external wire; an incoming line board (71) is provided on the incoming line terminal (7), and the coil (41) is welded to the incoming line board (71).

7. An economical miniature circuit breaker according to claim 6, characterized in that A baffle (14) is provided on the housing (1), the baffle (14) separates the incoming line board (71) from the arc extinguishing chamber (3), and an air flow channel (15) is provided between the arc extinguishing chamber (3) and the baffle (14).

8. An economical miniature circuit breaker according to claim 7, characterized in that A vertical portion (711) is provided on the incoming line board (71), the vertical portion (711) is attached to the baffle (14), and a hollow hole (712) is provided on the vertical portion (711).

9. An economical miniature circuit breaker according to claim 1, characterized in that It further includes an outgoing line terminal (8) which is arranged on the housing (1) and used for connecting with an external wire; an outgoing line board (81) is arranged on the outgoing line terminal (8), and the outgoing line board (81) is connected with the bimetal sheet (9).

10. An economical miniature circuit breaker according to claim 9, characterized in that A horizontal portion (811) is arranged on the outgoing line board (81), and a riveting convex block (812) convenient for welding with the bimetal sheet (9) is arranged on the horizontal portion (811).

Images