Residual-current circuit breaker

Abstract

Provided is a residual-current circuit breaker. The problems of large size, inconvenience in installation and high production cost of the existing residual-current circuit breaker are solved. The switch comprises a shell, a static contact piece and a movable contact piece, the release is arranged in the shell and is provided with a first position for installation and a second position for driving the moving contact to act so as to separate the moving contact from the static contact; the mutual inductor is arranged in the shell and is used for leakage protection; and the control circuit board is arranged in the shell, connected with the mutual inductor and used for receiving an electric leakage signal of the mutual inductor, and the control circuit board is connected with the tripper and used for controlling the tripper to act so that the movable contact piece can be separated from the static contact piece. According to the utility model, the mutual inductor and the control circuit board are arranged, the electric leakage protection is realized through the control circuit board, the control circuit board is connected with the release, the electric leakage protection and the short circuit protection share one release, parts are reduced, the production cost is reduced, and the release is reliable.

Description

Technical Field

[0001] The utility model relates to a low-voltage electrical appliance, in particular to a leakage circuit breaker. Background Art

[0002] A leakage protector, also known as a residual current switch or circuit breaker, is primarily used to protect against potentially fatal electric shock in equipment caused by leakage faults. It offers both overload and short-circuit protection, and can be used to protect lines or motors from overload and short circuits. It can also be used for infrequent line switching and starting under normal circumstances. Existing leakage circuit breakers typically include a contact system, a transformer, a circuit board, and a short-circuit release. The contact system typically includes a static contact and a moving contact. The release is typically used to achieve instantaneous tripping, providing protection in the event of a short circuit. The transformer detects a leakage signal and transmits it to the circuit board, which typically controls the operation of the leakage release. This requires two trip systems to trip the moving contact. Installing two releases complicates the product and takes up space within the housing, making existing leakage circuit breakers bulky, inconvenient to install, and expensive to produce. Utility Model Content

[0003] In order to solve the problems of the existing leakage circuit breaker in the background technology, such as large size, inconvenient installation and high production cost, the utility model provides a leakage circuit breaker.

[0004] The technical solution of the utility model is: a leakage circuit breaker, comprising a housing, a static contact piece and a movable contact piece, wherein the movable contact piece has a first position when cooperating with the static contact piece to conduct the circuit and a second position when separated from the static contact piece, and further comprising:

[0005] The tripper is arranged in the housing and has a first position when installed and a second position for driving the movable contact piece to separate the movable contact piece from the stationary contact piece;

[0006] The mutual inductor is installed in the housing and is used for leakage protection;

[0007] The control circuit board is arranged in the housing, connected to the mutual inductor and receives the leakage signal of the mutual inductor. The control circuit board is connected to the release and is used to control the action of the release to separate the moving contact piece from the static contact piece.

[0008] As a further improvement of the present invention, the release comprises:

[0009] a sleeve, disposed in the housing;

[0010] A push rod is provided in the sleeve and is used to drive the moving contact piece to separate from the static contact piece;

[0011] The static iron core is arranged in the casing;

[0012] The moving iron core is arranged in the sleeve and is used to drive the push rod to separate the moving contact piece from the static contact piece;

[0013] The leakage iron core is arranged in the sleeve and slides with the sleeve. The leakage iron core is connected to the push rod and is used to drive the push rod to move so that the moving contact piece and the static contact piece are separated.

[0014] As a further improvement of the present invention, it further comprises a leakage coil which is sleeved outside the casing and used for leakage tripping control. The leakage coil is connected to the control circuit board via a leakage wire.

[0015] As a further improvement of the present invention, it further comprises a first coil, wherein the first coil is connected to the static contact piece and is sleeved outside the sleeve for instantaneous tripping control.

[0016] As a further improvement of the present invention, the utility model further comprises a partition plate which is provided on the sleeve and forms an integral structure with the sleeve, and the partition plate separates the leakage coil and the first coil.

[0017] As a further improvement of the present invention, the following further features are also included:

[0018] A first elastic member, the first elastic member being provided between the static iron core and the movable iron core and used for resetting the movable iron core;

[0019] The shoulder is provided on the mandrel and is an integral structure with the mandrel; the movable iron core abuts against the shoulder and is used to drive the mandrel to move relative to the sleeve;

[0020] The second elastic member has one end abutting against the static iron core and the other end abutting against the shoulder, and is used for resetting the push rod; the leakage iron core is arranged at the end of the push rod and abuts against the push rod.

[0021] As a further improvement of the present invention, the following further features are also included:

[0022] A test wire, the test wire is connected to the control circuit board and controls the action of the release through the control circuit board;

[0023] A test button, wherein the test button is slidably engaged with the housing;

[0024] Conductive sheet, used for circuit conduction;

[0025] One end of the torsion spring is connected to the test wire, and the other end is located above the conductive sheet. When the test button is pressed, the torsion spring fits into the conductive sheet to connect the circuit and control the release action through the control circuit board.

[0026] As a further improvement of the present invention, it further comprises a middle shell, which separates the trip unit and the control circuit board; the middle shell is provided with a receiving groove for guiding the test button to pass through.

[0027] As a further improvement of the present invention, the following further features are also included:

[0028] Wiring terminals, provided on the housing;

[0029] A neutral line connecting wire is inserted into the housing and passes through the mutual inductor before being arranged on the wiring terminal.

[0030] As a further improvement of the present invention, it further comprises a grounding connection line, which passes through the shell and is arranged on the control circuit board for grounding leakage protection.

[0031] The beneficial effects of the present invention are that leakage protection is achieved by providing a mutual inductor and a control circuit board, and the control circuit board is connected to a trip unit, so that leakage protection and short-circuit protection share a single trip unit, thereby reducing parts and production costs and ensuring reliable tripping. The present invention also has the advantages of a simple structure, a small size, easy assembly, reliable operation, and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Attachment Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0033] Attachment Figure 2 This is a schematic diagram of the explosion structure of an embodiment of the utility model.

[0034] Attachment Figure 3 This is a schematic diagram of the structure inside the shell of an embodiment of the utility model.

[0035] Attachment Figure 4 This is a schematic diagram of the structure in another direction inside the shell of an embodiment of the utility model.

[0036] Attachment Figure 5 This is a schematic structural diagram of a release according to an embodiment of the present utility model.

[0037] Attachment Figure 6 For attachment Figure 5 Schematic diagram of the cross-sectional structure.

[0038] Attachment Figure 7 For attachment Figure 5 Schematic diagram of the explosion structure.

[0039] In the figure, 1. shell; 11. middle shell; 12. accommodating groove; 2. static contact piece; 3. moving contact piece; 4. tripper; 41. bushing; 411. partition; 42. push rod; 421. shoulder; 43. static iron core; 44. moving iron core; 45. leakage iron core; 46. leakage coil; 461. leakage wire; 47. first coil; 481. first elastic member; 482. second elastic member; 5. mutual inductor; 6. control circuit board; 71. test wire; 72. test button; 73. conductive sheet; 74. torsion spring; 81. terminal; 82. neutral wire; 83. ground wire. DETAILED DESCRIPTION

[0040] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0041] Depend on Figure 1 Combine Figure 2-7 As shown, a leakage circuit breaker includes a housing 1, a stationary contact piece 2 and a movable contact piece 3, wherein the movable contact piece 3 has a first position when cooperating with the stationary contact piece 2 to conduct the circuit and a second position when separated from the stationary contact piece 2, and further includes:

[0042] The tripper 4 is provided in the housing 1 and has a first position when installed and a second position for driving the movable contact piece 3 to separate the movable contact piece 3 from the stationary contact piece 2;

[0043] The mutual inductor 5 is provided in the housing 1 and is used for leakage protection;

[0044] A control circuit board 6 is disposed within the housing 1 and is connected to the transformer 5 and receives the leakage signal from the transformer 5. The control circuit board 6 is connected to the trip unit 4 and controls the operation of the trip unit 4 to separate the movable contact 3 from the stationary contact 2. The present invention advantageously provides leakage protection through the transformer and control circuit board. The control circuit board is connected to the trip unit, and a single trip unit is used for both leakage and short-circuit protection. This reduces component count, lowers production costs, and ensures reliable tripping. The present invention also offers advantages such as a simple structure, compact size, easy assembly, reliable operation, and a long service life.

[0045] The trip unit 4 includes:

[0046] The sleeve 41 is provided in the housing 1;

[0047] The push rod 42 is provided in the sleeve 41 and is used to drive the moving contact piece 3 to separate from the static contact piece 2;

[0048] The static iron core 43 is disposed in the sleeve 41;

[0049] The moving iron core 44 is disposed in the sleeve 41 and is used to drive the push rod 42 to move so as to separate the moving contact piece 3 from the stationary contact piece 2;

[0050] A leakage iron core 45 is positioned within the sleeve 41 and slidably engages with it. It is connected to the push rod 42 and drives the push rod 42 to separate the movable contact 3 from the stationary contact 2. This allows the movable iron core and the leakage iron core to actuate the push rod, thereby tripping the circuit breaker. In the event of a short circuit, the movable iron core actuates to provide instantaneous trip protection. In the event of a leakage, the transformer detects a leakage signal, and the leakage iron core actuates to drive the push rod to provide leakage trip protection. This simple structure provides convenient and reliable protection, while utilizing the existing trip device for leakage protection.

[0051] The present invention also includes a leakage coil 46, which is sleeved on the outside of the sleeve 41 for leakage tripping control. The leakage coil 46 is connected to the control circuit board 6 through a leakage wire 461. Specifically, it also includes a first coil 47, which is connected to the static contact piece 2. The first coil 47 is sleeved on the outside of the sleeve 41 for instantaneous tripping control. The leakage coil is used to drive the leakage iron core to move, and the first coil is used to drive the moving iron core to move. The structure is simple, the assembly is convenient, and the operation is reliable. More specifically, the present invention also includes a partition 411, which is provided on the sleeve 41 and is an integrated structure with the sleeve 41. The partition 411 separates the leakage coil 46 and the first coil 47. The setting of the partition separates the leakage coil and the first coil, and at the same time, forms an accommodating interval, which is convenient for limiting the first coil and the leakage coil.

[0052] The utility model also includes:

[0053] A first elastic member 481 is provided between the static iron core 43 and the movable iron core 44 and is used to reset the movable iron core 44;

[0054] The shoulder 421 is provided on the push rod 42 and is an integral structure with the push rod 42; the movable iron core 44 abuts against the shoulder 421 and is used to drive the push rod 42 to move relative to the sleeve 41;

[0055] One end of the second elastic member 482 abuts against the static iron core 43, and the other end abuts against the shoulder 421, allowing the push rod 42 to reset. The leakage iron core 45 is located at the end of the push rod 42 and abuts against it. The shoulder facilitates the movement of the push rod by the moving iron core, resulting in a simple structure and convenient and reliable operation. The leakage iron core is located at the end of the push rod, so that the moving iron core and the leakage iron core do not affect each other and can independently drive the push rod to separate the moving and static contacts. The second elastic member resets the leakage iron core through the push rod, facilitating subsequent operation.

[0056] The utility model also includes:

[0057] A test wire 71, the test wire 71 is connected to the control circuit board 6 and controls the operation of the release 4 through the control circuit board 6;

[0058] A test button 72, wherein the test button 72 is slidably engaged with the housing 1;

[0059] Conductive sheet 73, used for circuit conduction;

[0060] A torsion spring 74, one end of which is connected to the test lead 71 and the other end of which is positioned above the conductive plate 73, engages with the conductive plate 73 when the test button 72 is pressed, completing the circuit and controlling the operation of the trip unit 4 via the control circuit board 6. This facilitates testing of leakage performance and improves product safety. Specifically, the device also includes a middle housing 11, which separates the trip unit 4 from the control circuit board 6 and is provided with a receiving slot 12 for guiding the test button 72. More specifically, both legs of the torsion spring extend through the middle housing and are positioned on one side of the control circuit board, facilitating wiring without interfering with the movable contact or trip unit structure.

[0061] The utility model also includes:

[0062] The connection terminal 81 is provided on the housing 1;

[0063] A neutral connection line 82 is inserted into the housing 1, passes through the transformer 5, and is then attached to the terminal block 81. Specifically, the present invention also includes a ground connection line 83, which passes through the housing 1 and is attached to the control circuit board 6 for ground leakage protection. The neutral and ground connections provide leakage protection for the neutral and ground wires, enhancing product safety. Specifically, the conductive plate is connected to the live wire.

[0064] 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," "inner," and "outer," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0065] In the description of the present invention, it should be noted that, unless otherwise clearly specified or 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 an indirect connection through an intermediate medium, or it can be internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0066] Technical personnel please 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, comprising a housing (1), a stationary contact piece (2) and a movable contact piece (3), wherein the movable contact piece (3) has a first position in which it cooperates with the stationary contact piece (2) to conduct the circuit and a second position in which it is separated from the stationary contact piece (2), characterized in that Also includes: The release (4) is arranged in the housing (1) and has a first position when installed and a second position for driving the movable contact piece (3) to move so as to separate the movable contact piece (3) from the static contact piece (2); A mutual inductor (5), disposed in the housing (1), for leakage protection; A control circuit board (6) is provided in the housing (1), connected to the mutual inductor (5) and receives a leakage signal from the mutual inductor (5). The control circuit board (6) is connected to the trip unit (4) and is used to control the operation of the trip unit (4) so ​​that the moving contact piece (3) is separated from the static contact piece (2).

2. A leakage circuit breaker according to claim 1, characterized in that The trip unit (4) comprises: A sleeve (41) is disposed in the housing (1); A push rod (42) is disposed in the sleeve (41) and is used to drive the moving contact piece (3) to separate from the stationary contact piece (2); A static iron core (43) is disposed in the sleeve (41); A moving iron core (44) is disposed in the sleeve (41) and is used to drive the push rod (42) to move so as to separate the moving contact piece (3) from the stationary contact piece (2); The leakage iron core (45) is arranged in the sleeve (41) and is slidably matched with the sleeve (41). The leakage iron core (45) is connected to the push rod (42) and is used to drive the push rod (42) to move so that the moving contact piece (3) and the static contact piece (2) are separated.

3. A leakage circuit breaker according to claim 2, characterized in that It also includes a leakage coil (46) which is sleeved outside the sleeve (41) and is used for leakage tripping control. The leakage coil (46) is connected to the control circuit board (6) via a leakage wire (461).

4. A leakage circuit breaker according to claim 3, characterized in that It also includes a first coil (47), the first coil (47) is connected to the static contact piece (2), and the first coil (47) is sleeved outside the sleeve (41) for instantaneous tripping control.

5. A leakage circuit breaker according to claim 4, characterized in that It also includes a partition (411) which is provided on the sleeve (41) and forms an integral structure with the sleeve (41), wherein the partition (411) separates the leakage coil (46) and the first coil (47).

6. A leakage circuit breaker according to claim 2, characterized in that Also includes: a first elastic member (481), the first elastic member (481) being disposed between the static iron core (43) and the movable iron core (44) and being used for resetting the movable iron core (44); The shoulder (421) is provided on the push rod (42) and is an integral structure with the push rod (42); the movable iron core (44) abuts against the shoulder (421) and is used to drive the push rod (42) to move relative to the sleeve (41); The second elastic member (482) has one end abutting against the static iron core (43) and the other end abutting against the shoulder (421), and is used to reset the push rod (42); the leakage iron core (45) is provided at the end of the push rod (42) and abuts against the push rod (42).

7. The leakage circuit breaker according to claim 1, characterized in that Also includes: A test wire (71), the test wire (71) is connected to the control circuit board (6) and controls the operation of the release (4) through the control circuit board (6); A test button (72), wherein the test button (72) is slidably engaged with the housing (1); A conductive sheet (73) for conducting a circuit; A torsion spring (74) has one end connected to the test lead (71) and the other end disposed above the conductive sheet (73). When the test button (72) is pressed, the torsion spring (74) is in contact with the conductive sheet (73), thereby conducting the circuit and controlling the operation of the release (4) through the control circuit board (6).

8. A leakage circuit breaker according to claim 7, characterized in that It also includes a middle shell (11), which separates the trip unit (4) and the control circuit board (6); the middle shell (11) is provided with a receiving groove (12) for the test button (72) to pass through and guide.

9. The leakage circuit breaker according to claim 1, characterized in that Also includes: A connection terminal (81) is provided on the housing (1); A neutral line connecting line (82) is inserted into the housing (1) and passes through the mutual inductor (5) before being arranged on the wiring terminal (81).

10. The leakage circuit breaker according to claim 1, characterized in that It also includes a grounding connection line (83), which passes through the housing (1) and is arranged on the control circuit board (6) for grounding leakage protection.

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