Residual-current circuit breaker with zero-sequence mutual inductor having protective shielding structure

Abstract

The utility model relates to a residual-current circuit breaker with a zero-sequence mutual inductor having a protection shielding structure. The problem that an existing mutual inductor is prone to failure is solved. The device comprises a shell, the contact system is arranged in the shell and used for connecting or disconnecting a circuit in the shell; the mutual inductor is arranged in the shell and is used for allowing a wire to pass through to detect leakage current; the release is arranged in the shell and is used for breaking the contact system; the circuit board is arranged in the shell, and the release is electrically connected with the circuit board; and the protection shielding assembly is arranged outside the mutual inductor in a sleeving manner and is used for protecting the mutual inductor. The beneficial effects of the utility model are that the protective shielding assembly is added to protect the mutual inductor, so that the product performance is stable and the service life is long. The utility model also has the advantages of simple structure, convenience in assembly, reliable action, long service life and the like.

Description

Technical Field

[0001] The utility model relates to a leakage circuit breaker, in particular to a leakage circuit breaker with a zero-sequence mutual inductor having a protective shielding structure. Background Art

[0002] The leakage protector, also known as the leakage switch or leakage circuit breaker, is mainly used to protect against electric shock when leakage occurs in the equipment and is fatal. It has overload and short-circuit protection functions, and can be used to protect the overload and short circuit of the line or motor. It can also be used for the infrequent switching and starting of the line under normal circumstances. The existing leakage circuit breaker usually includes a contact system, a transformer, a circuit board and a release. The contact system usually includes a static contact and a moving contact. The transformer and the release are both connected to the circuit board. The transformer detects the leakage signal and transmits it to the circuit board. The circuit board controls the release to separate the moving contact from the static contact to play the role of leakage protection. However, in actual use, due to the lack of protection of the electronic circuit board and electromagnetic compatibility, the design of the core components such as the electronic circuit board assembly, the zero-sequence transformer, etc. is invalid or insufficient. Electromagnetic compatibility, the design of the core components such as the electronic circuit board assembly, the zero-sequence transformer, etc. is prone to failure or insufficiency, which shortens the product life and greatly increases the unqualified rate. Utility Model Content

[0003] In order to solve the problem that the existing mutual inductors in the background technology are prone to failure, the utility model provides a leakage circuit breaker having a zero-sequence mutual inductor with a protective shielding structure.

[0004] The technical solution of the utility model is: a leakage circuit breaker with a zero-sequence mutual inductor having a protective shielding structure, comprising a housing, and also comprising:

[0005] A contact system, arranged in the housing, for connecting or disconnecting the circuit in the housing;

[0006] A mutual inductor, arranged in the housing, for allowing the conductor to pass through to detect leakage current;

[0007] A release device is arranged in the housing and is used to disconnect the contact system;

[0008] A circuit board is arranged in the housing, and the release is electrically connected to the circuit board;

[0009] The protective shielding component is sleeved outside the transformer and is used to protect the transformer.

[0010] As a further improvement of the present invention, the protective shielding assembly includes a first protective cover and a second protective cover, the second protective cover is sleeved outside the first protective cover, and the first protective cover is wrapped outside the mutual inductor.

[0011] As a further improvement of the present invention, the mutual inductor comprises an electromagnetic magnetic ring and an electronic magnetic ring, and the protective shielding component is coated on the outside of the electromagnetic magnetic ring and the electronic magnetic ring.

[0012] As a further improvement of the utility model, the electromagnetic magnetic ring is connected to the release through a driving capacitor, the driving capacitor is arranged on a circuit board, and the electronic magnetic ring is connected to the release through the circuit board and is used to drive the release to operate.

[0013] As a further improvement of the utility model, the first protective cover is a plastic protective cover, and the second protective cover is a metal protective cover, which are used to improve electromagnetic compatibility.

[0014] As a further improvement of the present invention, the protective shielding assembly includes a first outer surface and a second outer surface, the diameter of the first outer surface is greater than the diameter of the second outer surface, and a shoulder is formed between the first outer surface and the second outer surface.

[0015] As a further improvement of the utility model, a stopper is provided on the inner wall of the shell, and the stopper abuts against the stop shoulder.

[0016] As a further improvement of the utility model, the stopper is arranged on the side wall of the shell, and the stopper is provided with an arc-shaped groove for the stopper shoulder to be inserted.

[0017] As a further improvement of the utility model, a positioning column is provided at the bottom of the shell, and a positioning hole for the positioning column to pass through is provided on the protective shielding assembly.

[0018] As a further improvement of the utility model, a support rib is provided at the bottom of the positioning column, and a square seat is provided on the outer surface of the protective shielding assembly.

[0019] The beneficial effect of the utility model is that a protective shielding component is added to protect the mutual inductor, so that the product performance is stable and the service life is long. The utility model also has the advantages of simple structure, convenient assembly, reliable action, long service life, etc. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Attached Figure 3 It is a schematic structural diagram of the housing 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] In the figure, 1, shell; 11, stopper; 12, arc-shaped groove; 13, positioning column; 14, supporting rib; 2, contact system; 3, mutual inductor; 31, electromagnetic magnetic ring; 32, electronic magnetic ring; 4, wire; 5, release; 6, circuit board; 61, driving capacitor; 7, protective shielding assembly; 71, first protective cover; 72, second protective cover; 73, first outer surface; 74, second outer surface; 75, shoulder; 76, positioning hole; 77, square seat. DETAILED DESCRIPTION

[0025] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0026] Depend on Figure 1 Combination Figure 2-4 As shown, a zero-sequence mutual inductor has a protective shielding structure of the leakage circuit breaker, including a housing 1, and also includes:

[0027] The contact system 2 is arranged in the housing 1 and is used to connect or disconnect the circuit in the housing 1;

[0028] A mutual inductor 3 is arranged in the housing 1 and is used for the conductor 4 to pass through and detect leakage current;

[0029] A release 5 is arranged in the housing 1 and is used to disconnect the contact system 2;

[0030] A circuit board 6 is disposed in the housing 1, and the release 5 is electrically connected to the circuit board 6;

[0031] The protective shielding component 7 is sleeved outside the mutual inductor 3 to protect the mutual inductor 3. The beneficial effect of the utility model is that the protective shielding component is added to protect the mutual inductor, so that the product performance is stable and the service life is long. The utility model also has the advantages of simple structure, convenient assembly, reliable operation, long service life, etc.

[0032] The protective shielding assembly 7 includes a first protective cover 71 and a second protective cover 72, wherein the second protective cover 72 is sleeved outside the first protective cover 71, and the first protective cover 71 is wrapped outside the mutual inductor 3. Specifically, the mutual inductor 3 includes an electromagnetic magnetic ring 31 and an electronic magnetic ring 32, and the protective shielding assembly 7 is wrapped outside the electromagnetic magnetic ring 31 and the electronic magnetic ring 32. More specifically, the electromagnetic magnetic ring 31 is connected to the release 5 through a driving capacitor 61, and the driving capacitor 61 is arranged on a circuit board 6, and the electronic magnetic ring 32 is connected to the release 5 through the circuit board 6 and is used to drive the release 5 to operate. Such a structure can control the release to operate and release through the driving circuit on the circuit board, and has a simple structure, reliable detection, convenient release, and higher safety. The mutual inductor voltage of the utility model depends on the grid voltage, performs full current sampling on the main circuit, and detects high-frequency AC fault residual current, pulsating DC residual current, and smooth DC residual current. The mutual inductor of the utility model is independent of the grid voltage, performs electromagnetic current sampling on the main circuit, and detects the industrial frequency AC residual current and the pulsating DC residual current.

[0033] The first protective cover 71 is a plastic protective cover, and the second protective cover 72 is a metal protective cover, which is used to improve electromagnetic compatibility. The plastic protective cover can provide three protections for customer electronic components, namely, mainly anti-humidity design, anti-salt spray design, and anti-mold design. On the basis of the original protective shell, an EMC anti-electromagnetic compatibility metal shell is added. Through the product surge and pulse group test, the product function is normal and reliable, and there will be no customer feedback that the leakage protection value is inaccurate or drifting, or even failure occurs.

[0034] The protective shielding assembly 7 includes a first outer surface 73 and a second outer surface 74, the diameter of the first outer surface 73 is larger than the diameter of the second outer surface 74, and a stop shoulder 75 is formed between the first outer surface 73 and the second outer surface 74. Specifically, a stopper 11 is provided on the inner wall of the housing 1, and the stopper 11 abuts against the stop shoulder 75. Such a structure can limit the protective shielding assembly and the zero-sequence transformer, and prevent the zero-sequence transformer from moving horizontally and causing the line connection to be separated.

[0035] The stopper 11 is arranged on the side wall of the housing 1, and an arc-shaped groove 12 is provided on the stopper 11 for inserting the stop shoulder 75. Such a structure is simple, easy to install and reliable in positioning.

[0036] The bottom of the housing 1 is provided with a positioning column 13, and the protective shielding component 7 is provided with a positioning hole 76 for the positioning column 13 to pass through. Specifically, the housing includes an upper cover and a base, and the positioning column and the stopper are both provided on the base. Such a structure prevents the protective shielding component from rotating, has a simple structure, and is easy to install.

[0037] The bottom of the positioning column 13 is provided with a support rib 14, and the outer surface of the protective shielding assembly 7 is provided with a square seat 77. The support rib increases the strength of the positioning column, and at the same time, the product is reliably positioned when it is inserted into the positioning hole, and the square seat is close to the base and fits better, so that it will not rotate.

[0038] 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.

[0039] 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.

[0040] 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 leakage circuit breaker with a zero-sequence transformer having a protective shielding structure, comprising a housing (1), characterized in that : Also includes: A contact system (2) is disposed in the housing (1) and is used to connect or disconnect the circuit in the housing (1); A mutual inductor (3) is arranged in the housing (1) and is used for allowing the conductor (4) to pass through to detect leakage current; A release (5) is arranged in the housing (1) and is used to disconnect the contact system (2); A circuit board (6) is arranged in the housing (1), and the release (5) is electrically connected to the circuit board (6); A protective shielding component (7) is sleeved outside the mutual inductor (3) and is used to protect the mutual inductor (3).

2. A leakage circuit breaker having a protective shielding structure for a zero-sequence mutual inductor according to claim 1, characterized in that The protective shielding assembly (7) comprises a first protective cover (71) and a second protective cover (72), wherein the second protective cover (72) is sleeved outside the first protective cover (71), and the first protective cover (71) is wrapped outside the mutual inductor (3).

3. A leakage circuit breaker having a zero-sequence mutual inductor and a protective shielding structure according to claim 1, characterized in that The mutual inductor (3) comprises an electromagnetic magnetic ring (31) and an electronic magnetic ring (32), and the protective shielding component (7) is coated on the outside of the electromagnetic magnetic ring (31) and the electronic magnetic ring (32).

4. A leakage circuit breaker having a protective shielding structure for a zero-sequence mutual inductor according to claim 3, characterized in that The electromagnetic magnetic ring (31) is connected to the release (5) via a driving capacitor (61), the driving capacitor (61) is arranged on a circuit board (6), and the electronic magnetic ring (32) is connected to the release (5) via the circuit board (6) and is used to drive the release (5) to operate.

5. The zero-sequence transformer according to claim 2 has a leakage circuit breaker with a protective shielding structure, characterized in that The first protective cover (71) is a plastic protective cover, and the second protective cover (72) is a metal protective cover, which are used to improve electromagnetic compatibility.

6. The zero-sequence transformer according to claim 1 has a residual current circuit breaker with a protective shielding structure, characterized in that The protective shielding assembly (7) comprises a first outer surface (73) and a second outer surface (74); the diameter of the first outer surface (73) is greater than the diameter of the second outer surface (74); and a shoulder (75) is formed between the first outer surface (73) and the second outer surface (74).

7. A leakage circuit breaker having a zero-sequence mutual inductor and a protective shielding structure according to claim 6, characterized in that A stopper (11) is provided on the inner wall of the housing (1), and the stopper (11) abuts against the stop shoulder (75).

8. A leakage circuit breaker having a protective shielding structure for a zero-sequence mutual inductor according to claim 7, characterized in that The stopper (11) is arranged on the side wall of the housing (1), and an arc-shaped groove (12) is provided on the stopper (11) for the stopper shoulder (75) to be inserted into.

9. The zero-sequence transformer according to claim 1 has a residual current circuit breaker with a protective shielding structure, characterized in that A positioning column (13) is provided at the bottom of the shell (1), and a positioning hole (76) for the positioning column (13) to pass through is provided on the protective shielding component (7).

10. A leakage circuit breaker having a zero-sequence mutual inductor and a protective shielding structure according to claim 9, characterized in that A supporting rib (14) is provided at the bottom of the positioning column (13), and a square seat (77) is provided on the outer surface of the protective shielding component (7).

Images