Miniature circuit breaker

Abstract

Provided is a miniature circuit breaker. The problem that a wiring terminal of an existing miniature circuit breaker is not shielded, and potential safety hazards exist is solved. The device comprises a shell, the contact mechanism comprises a static contact piece and a movable contact piece; a transmission mechanism, wherein the movable contact piece is arranged on the transmission mechanism; the operating mechanism is connected with the transmission mechanism and drives the movable contact piece to be attached to or separated from the static contact piece through the transmission mechanism so as to realize circuit connection or disconnection; the wiring terminal is used for wiring; the shell is provided with an installation cavity and an operation hole, and the wiring terminal is arranged in the installation cavity; the operation hole is arranged above the wiring terminal; the partition plate is inserted into the shell and separates the mounting cavity from the operation hole; and the partition plate is detachably connected with the shell. The beneficial effects of the utility model are that the separator plate is arranged to shield the installation cavity, so that the installation cavity is separated from the operation hole, and foreign matters, dust and the like are prevented from entering the housing to affect the product performance.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a small circuit breaker. Background Art

[0002] Miniature circuit breakers (English name: Miniature Circuit Breaker), also known as microcircuit breakers, are suitable for overload and short-circuit protection of low-voltage lines. They can also be used for infrequent operation conversion of lines under normal circumstances. Miniature circuit breakers are mainly used in various places such as industry, commerce, high-rise and residential buildings. Miniature circuit breakers usually include a housing, an operating mechanism, a tripping system, a contact system, an arc extinguishing system, etc. The operating mechanism drives the moving contact in the contact system through the operating handle to connect and disconnect the miniature circuit breaker to control the electrical circuit; by sensing the thermal effect and magnetic effect of the current, protection is implemented when the electrical circuit is overloaded, short-circuited, and other faults occur. During the disconnection 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-starting plate. When the arc is introduced into the arc extinguishing chamber, it is divided into many sections by the metal grid in the arc extinguishing chamber. Each arc section generates a near-pole voltage near the metal grid, which rapidly increases the voltage drop of the entire arc and extinguishes the arc. However, since the moving and static contacts are relatively far from the arc extinguishing chamber, and there will be arc-isolating plates to form a cavity to prevent the arc from leaking out, but since the cavity is a certain distance away from the two arc-starting plates, during the disconnection process of the moving contact, the existing arc-starting plates cannot start an arc, which increases the arc extinguishing time. The arc in the electrical housing is easy to damage other parts in the housing, which poses a great safety hazard. In addition, the existing wiring terminals are arranged in the housing. In order to tighten and fix the wires on the screws on the wiring terminals, through holes are usually provided on the top of the housing. In this way, dust or other foreign matter can easily enter the circuit breaker housing, affecting the product wiring performance and product safety. Utility Model Content

[0003] In order to solve the problem that the connection terminals of the existing small circuit breakers in the background technology are not shielded and there are potential safety hazards, the utility model provides a small circuit breaker

[0004] The technical solution of the utility model is: a small circuit breaker, including a housing, and also including:

[0005] The contact mechanism is arranged in the housing and includes a stationary contact piece and a moving contact piece;

[0006] A transmission mechanism is arranged in the housing and rotates relative to the housing, and the movable contact piece is arranged on the transmission mechanism;

[0007] An operating mechanism is connected to the transmission mechanism and drives the moving contact piece to fit or separate from the stationary contact piece through the transmission mechanism to connect or disconnect the circuit;

[0008] The wiring terminal is used for wiring; the housing is provided with a mounting cavity and an operating hole, the wiring terminal is arranged in the mounting cavity; the operating hole is arranged above the wiring terminal;

[0009] A partition is inserted into the shell and separates the installation cavity from the operation hole; the partition is detachably connected to the shell.

[0010] As a further improvement of the utility model, a slot is provided on the shell, and a hook portion is provided at the bottom of the partition. The partition is inserted into the slot from a horizontal direction and is detachably connected to the shell. When the partition is inserted into the shell, the hook portion is engaged with the inner wall of the shell and limits the partition in the direction of its pulling out.

[0011] As a further improvement of the utility model, a mounting notch is provided on the shell, and a baffle portion is provided at the bottom of the partition, and the baffle portion is inserted into the mounting notch.

[0012] As a further improvement of the utility model, the upper surface of the partition is convex upward to form an operating part, and the operating part is provided with a protrusion or a groove for increasing friction.

[0013] As a further improvement of the utility model, the partition is provided with a pressing portion at the other end opposite to the operating portion, and the pressing portion is arranged in an arc shape.

[0014] As a further improvement of the present utility model, a positioning hole is provided on the shell of the shell, a guide hole is provided on the partition, the positioning hole is connected with the guide hole, the guide hole is obliquely arranged and its outlet is arranged on the outside of the shell, and the outer surface of the shell at the operating hole is recessed downward.

[0015] As a further improvement of the utility model, the housing comprises a first shell and a second shell, and the first shell and the second shell cooperate with each other through a positioning block and a positioning notch to form the positioning hole.

[0016] As a further improvement of the utility model, an arc extinguishing space for the movable contact piece to swing is provided inside the shell, and an arc extinguishing baffle is provided on the inner wall of the shell at the arc extinguishing space, and the arc extinguishing baffle extends to the arc extinguishing chamber.

[0017] As a further improvement of the utility model, there are multiple arc-extinguishing baffles, and the arc-extinguishing baffles are arranged in an arc shape.

[0018] As a further improvement of the utility model, an arc-striking baffle is provided on the inner wall of the shell, and the arc-striking baffle is arranged between the transmission mechanism and the arc extinguishing space.

[0019] The utility model has the beneficial effect that a partition is provided to shield the installation cavity, so that the installation cavity is separated from the operation hole, and foreign matter, dust, etc. are prevented from entering the shell and affecting product performance. The utility model also has the advantages of simple structure, convenient assembly, reliable action, and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Attached Figure 2 The figure is a schematic diagram of the explosion structure of an embodiment of the utility model.

[0022] Attached Figure 3 The figure is a schematic diagram of the explosion structure of an embodiment of the utility model.

[0023] Attached Figure 4 It is a schematic diagram of the structure inside the shell of an embodiment of the utility model.

[0024] Attached Figure 5 It is a schematic structural diagram of a partition according to an embodiment of the utility model.

[0025] Attached Figure 6 It is a schematic structural diagram of the partition in another direction of an embodiment of the utility model.

[0026] In the figure, 1. shell; 11. installation cavity; 12. operating hole; 13. slot; 14. installation notch; 15. positioning hole; 151. positioning block; 152. positioning notch; 16. first shell; 17. second shell; 18. arc extinguishing space; 181. arc extinguishing baffle; 182. arc striking baffle; 2. contact mechanism; 21. static contact piece; 22. moving contact piece; 3. transmission mechanism; 4. operating mechanism; 5. terminal; 6. partition; 61. hook part; 62. baffle part; 63. operating part; 631. protrusion; 64. pressing part; 65. guide hole; 7. arc extinguishing chamber. DETAILED DESCRIPTION

[0027] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0028] Depend on Figure 1 Combination Figure 2-6 As shown, a miniature circuit breaker includes a housing 1 and further includes:

[0029] The contact mechanism 2 is arranged in the housing 1 and includes a stationary contact piece 21 and a movable contact piece 22;

[0030] The transmission mechanism 3 is arranged in the housing 1 and rotates relative to the housing 1, and the movable contact piece 22 is arranged on the transmission mechanism 3;

[0031] The operating mechanism 4 is connected to the transmission mechanism 3 and drives the moving contact piece 22 to fit or separate with the stationary contact piece 21 through the transmission mechanism 3 to connect or disconnect the circuit;

[0032] The wiring terminal 5 is used for wiring; the housing 1 is provided with a mounting cavity 11 and an operating hole 12, the wiring terminal 5 is arranged in the mounting cavity 11; the operating hole 12 is arranged above the wiring terminal 5;

[0033] The partition 6 is inserted into the housing 1 and separates the installation cavity 11 from the operating hole 12; the partition 6 is detachably connected to the housing 1. The beneficial effect of the utility model is that the partition is provided to shield the installation cavity, so that the installation cavity is separated from the operating hole, and foreign matter, dust, etc. are prevented from entering the housing and affecting product performance. The utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life.

[0034] The shell 1 is provided with a slot 13, and the bottom of the partition 6 is provided with a hook portion 61. The partition 6 is inserted into the slot 13 from the horizontal direction and is detachably connected to the shell 1. When the partition 6 is inserted into the shell 1, the hook portion 61 is engaged with the inner wall of the shell 1 and limits the partition 6 in the direction of its pull-out. Such a structure facilitates the rapid insertion and removal of the partition, and closes the installation cavity from the top of the shell to prevent foreign matter (dust, water, etc.) from entering and affecting the wiring terminals and product performance, thereby making the product safer. The setting of the hook portion prevents the partition from falling off, and the limiting is convenient and reliable, with a simple structure. Usually, the cross-section of the hook portion is triangular, which can be guided during insertion to facilitate the insertion of the partition. After insertion, it can be reliably limited to prevent the partition from falling off.

[0035] The housing 1 is provided with a mounting notch 14, and the bottom of the partition 6 is provided with a baffle portion 62, which is inserted into the mounting notch 14. Such a structure can play a role of limiting, mainly a role of left and right swing limiting and supporting, to prevent the partition from shaking.

[0036] The upper surface of the partition 6 is convex upward to form an operating portion 63, and a protrusion 631 or a groove for increasing friction is provided on the operating portion 63. Such a structure is easy to operate, simple in structure, increases the friction with the operating finger or tool, and is easy to pull out the partition reliably.

[0037] The partition 6 is provided with a pressing portion 64 at the other end opposite to the operating portion 63, and the pressing portion 64 is arranged in an arc shape. This is more in line with the internal structure of the shell, is convenient for pressing, and has reliable sealing. At the same time, after the pressing portion is deformed by pressing, it provides a certain elastic force when the partition is pulled out.

[0038] The shell 1 of the shell is provided with a positioning hole 15, the partition 6 is provided with a guide hole 65, the positioning hole 15 is connected with the guide hole 65, the guide hole 65 is obliquely arranged and its outlet is arranged outside the shell 1, and the outer surface of the shell 1 at the operation hole 12 is recessed. Specifically, the shell 1 includes a first shell 16 and a second shell 17, and the first shell 16 and the second shell 17 cooperate with each other through a positioning block 151 and a positioning notch 152 to form the positioning hole 15. The arrangement of the positioning hole and the guide hole can shield external dust.

[0039] The housing 1 is provided with an arc extinguishing space 18 for the movable contact piece 22 to swing, and the housing 1 is provided with an arc extinguishing baffle 181 on the inner wall of the arc extinguishing space 18, and the arc extinguishing baffle 181 extends to the arc extinguishing chamber 7. Specifically, there are multiple arc extinguishing baffles 181, and the arc extinguishing baffles 181 are arranged in an arc shape. The arrangement of the arc extinguishing baffle separates the ignition when the arc is generated, increases the creepage distance, and facilitates arc initiation and arc extinguishing.

[0040] An arc-striking baffle 182 is provided on the inner wall of the housing 1, and the arc-striking baffle 182 is provided between the transmission mechanism 3 and the arc-extinguishing space 18. Such a structure can prevent the heat and arc in the arc-extinguishing space from affecting the components at the transmission mechanism, thereby extending the service life of the product.

[0041] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood 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 limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, 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 specified, "plurality" means two or more.

[0043] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of the utility model patent right.

Claims

1. A miniature circuit breaker, comprising a housing (1), characterized in that Also included: A contact mechanism (2) is arranged in the housing (1), comprising a stationary contact piece (21) and a movable contact piece (22); A transmission mechanism (3) is disposed in the housing (1) and rotates relative to the housing (1), and the movable contact piece (22) is disposed on the transmission mechanism (3); The operating mechanism (4) is connected to the transmission mechanism (3) and drives the moving contact piece (22) to fit or separate with the stationary contact piece (21) through the transmission mechanism (3) to achieve circuit connection or disconnection; A wiring terminal (5) is used for wiring; the housing (1) is provided with a mounting cavity (11) and an operating hole (12); the wiring terminal (5) is arranged in the mounting cavity (11); the operating hole (12) is arranged above the wiring terminal (5); A partition (6) is inserted into the housing (1) and separates the installation cavity (11) from the operation hole (12); the partition (6) is detachably connected to the housing (1).

2. A miniature circuit breaker according to claim 1, characterized in that The shell (1) is provided with a slot (13), and the bottom of the partition (6) is provided with a hook portion (61). The partition (6) is inserted into the slot (13) from a horizontal direction and is detachably connected to the shell (1). When the partition (6) is inserted into the shell (1), the hook portion (61) is engaged with the inner wall of the shell (1) and limits the partition (6) in the direction in which it is pulled out.

3. A miniature circuit breaker according to claim 1, characterized in that The shell (1) is provided with a mounting notch (14), and the bottom of the partition (6) is provided with a baffle portion (62), and the baffle portion (62) is inserted into the mounting notch (14).

4. A miniature circuit breaker according to claim 1, characterized in that The upper surface of the partition (6) is raised upward to form an operating portion (63), and the operating portion (63) is provided with a protrusion (631) or a groove for increasing friction.

5. A miniature circuit breaker according to claim 4, characterized in that The partition plate (6) is provided with a pressing portion (64) at the other end opposite to the operating portion (63), and the pressing portion (64) is arranged in an arc shape.

6. A miniature circuit breaker according to claim 1, characterized in that The shell (1) of the shell is provided with a positioning hole (15), the partition (6) is provided with a guide hole (65), the positioning hole (15) is connected to the guide hole (65), the guide hole (65) is arranged obliquely and its outlet is arranged outside the shell (1), and the outer surface of the shell (1) at the operating hole (12) is arranged to be recessed downward.

7. A miniature circuit breaker according to claim 6, characterized in that The housing (1) comprises a first shell (16) and a second shell (17), and the first shell (16) and the second shell (17) cooperate with each other through a positioning block (151) and a positioning notch (152) to form the positioning hole (15).

8. A miniature circuit breaker according to claim 1, characterized in that An arc extinguishing space (18) for the movable contact piece (22) to swing is provided inside the housing (1), and an arc extinguishing baffle (181) is provided on the inner wall of the housing (1) at the arc extinguishing space (18), and the arc extinguishing baffle (181) is extended to the arc extinguishing chamber (7).

9. A miniature circuit breaker according to claim 8, characterized in that There are a plurality of arc extinguishing baffles (181), and the arc extinguishing baffles (181) are arranged in an arc shape.

10. A miniature circuit breaker according to claim 8, characterized in that An arc-striking baffle (182) is provided on the inner wall of the housing (1), and the arc-striking baffle (182) is arranged between the transmission mechanism (3) and the arc-extinguishing space (18).

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