A circuit breaker with residual current protection function

Abstract

A circuit breaker with residual current protection function. The problem of unreliable operation of the test button of the existing circuit breaker is solved. It includes a shell, and also includes: a zero-sequence mutual inductor, which is arranged in the shell and is used to realize the leakage protection function; a control circuit board, which is connected to the zero-sequence mutual inductor; the control circuit board is provided with a first conductive member and a second conductive member; a releaser, which is connected to the control circuit board and is controlled by the control circuit board to make the release mechanism actuated and tripped; a test button, which is arranged on the shell; a first elastic member, the first elastic member includes a first leg and a second leg, the first leg is in contact with the first conductive member, the second leg is in contact with the test button and is in contact with the second conductive member when the test button is pressed, so that the circuit is turned on and the releaser is actuated and tripped; a reset button, which is used to maintain the position of the releaser. The utility model has the advantages of simple structure, convenient assembly, reliable operation, and long service life.

Description

Technical Field

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

[0002] Installing a residual current operated protective device (RCD) in a low-voltage power grid is an effective protective measure to prevent electric shock, electrical fires and damage to electrical equipment. It is mainly used to protect against fatal electric shock when equipment has leakage faults and has overload and short-circuit protection functions. It can be used to protect lines or motors from overload and short circuit, and can also be used for infrequent switching and starting of lines under normal circumstances.

[0003] According to the action mode, it can be divided into electromagnetic residual current protector and electronic residual current protector. The output voltage of the secondary circuit of the zero-sequence current transformer of the electromagnetic residual current protector directly excites the residual current release without any amplification, which is called electromagnetic residual current protector, and its action function has nothing to do with the line voltage. An electronic amplification circuit is connected between the secondary circuit and the release of the zero-sequence current transformer of the electronic residual current protector. The output voltage of the secondary circuit of the transformer is amplified by the electronic circuit and then excites the residual current release, which is called electronic residual current protector, and its action function is related to the line voltage.

[0004] The existing circuit breaker with residual current protection function usually includes a first shell, a second shell, a middle shell, a first contact system and a second contact system, wherein the first contact system, a control circuit board, a mutual inductor, a release, etc. are placed between the first shell and the second shell, so that when the contact system is disconnected, it will affect the components on the control circuit board, causing failure and shortening the service life of the product. The space between the first shell and the middle shell is relatively large, and the internal parts are difficult to assemble. The test button of the existing circuit breaker usually detects the leakage current through a micro switch or a mechanical structure when pressed, and the structure is complicated. In addition, the existing reset switch is also relatively complicated and the operation is unreliable. Utility Model Content

[0005] In order to solve the problem of unreliable action of the test button of the existing circuit breaker in the background technology, the utility model provides a circuit breaker with a residual current protection function.

[0006] The technical scheme of the utility model is: a circuit breaker with residual current protection function, comprising a housing, wherein the housing comprises a first housing and a second housing, wherein the first housing and the second housing form a first cavity; wherein a first wiring terminal, a first contact mechanism and a tripping mechanism are arranged in the housing, wherein the first wiring terminal is connected to the first contact mechanism through a wire, wherein the first contact mechanism comprises a first stationary contact piece and a first moving contact piece; and further comprising:

[0007] A first middle shell, wherein the first middle shell and the first shell cooperate with each other to form a second cavity;

[0008] A zero-sequence transformer is arranged in the housing and is used to realize the leakage protection function. The wire passes through the zero-sequence transformer;

[0009] A control circuit board is arranged in the second cavity and connected to the zero-sequence mutual inductor; the control circuit board is provided with a first conductive member and a second conductive member;

[0010] The releaser is arranged in the second cavity and connected to the control circuit board, and its action is controlled by the control circuit board so that the release mechanism is actuated to release;

[0011] A test button is provided on the housing and inserted into the second cavity;

[0012] A first elastic member, the first elastic member includes a first leg and a second leg, the first leg is in contact with the first conductive member, the second leg is in contact with the test button and is in contact with the second conductive member when the test button is pressed, so that the circuit is turned on and the releaser is tripped;

[0013] The reset button is arranged in the second cavity and is used to maintain the position of the releaser.

[0014] The test button comprises a pressing portion, the pressing portion is arranged toward the first middle shell, and the second leg abuts against the pressing portion and has a movement tendency of driving the test button away from the control circuit board.

[0015] As a further improvement of the utility model, it also includes a support member, the support member is provided with a guide hole, the test button is provided with a guide portion, and the guide portion is arranged through the guide hole.

[0016] As a further improvement of the utility model, the support member is arranged in a "J" shape, and a second elastic member is provided on the support member. The second elastic member is against the test button and has a tendency to drive the test button away from the control circuit board. The test button is provided with a hook portion adapted to the shell.

[0017] As a further improvement of the utility model, the support member is arranged on the first middle shell and is detachably connected to the first middle shell, a support frame is arranged on the first shell, and the support member is arranged on the support frame.

[0018] As a further improvement of the utility model, it also includes a second middle shell, the first middle shell and the second middle shell cooperate with each other and cover the first contact mechanism; the first cavity is connected to the second cavity, the zero-sequence transformer is vertically placed in the first cavity, and the zero-sequence transformer is arranged between the first contact mechanism and the first terminal.

[0019] As a further improvement of the utility model, it also includes a transmission rod, the tripping mechanism is provided with a tripping rod, the tripping rod passes through the first middle shell and is arranged in the second cavity, and the tripper drives the transmission rod to rotate to drive the tripping rod to move so that the tripping mechanism is tripped.

[0020] As a further improvement of the utility model, it also includes a third elastic member, the tripper includes a tripping drive rod, the transmission rod is hinged on the first middle shell, one end of the transmission rod is connected to the tripping drive rod and is driven to move by the tripping drive rod, and the other end is arranged toward the reset button, the third elastic member is against the reset button and has a tendency to drive the reset button away from the shell; the reset button has a first position limited by the transmission rod and a second position driven to move by the third elastic member when tripping; the reset button is against the transmission rod to limit the transmission rod when it is in the second position.

[0021] As a further improvement of the utility model, the reset button is provided with a limiting portion, and the transmission rod is provided with a transmission inclined surface and a limiting hole. When the reset button is in the first position, the limiting portion is inserted into the limiting hole and limited by the transmission rod. When the reset button is in the second position, it is offset from the transmission inclined surface to limit the swing of the transmission rod.

[0022] As a further improvement of the utility model, a limit plate and a limit column are provided on the first middle shell, the limit plate is inserted into the reset button for limiting the reset button, and the limit column is provided on the movement trajectory of the release drive rod for limiting the movement of the release drive rod.

[0023] The beneficial effects of the utility model are that the test button forms a passage through the first elastic member, the structure is simple, the circuit is easy to conduct and the assembly is convenient, and the test is reliable. The setting of the reset button facilitates the release to operate smoothly and reset reliably. The utility model also has the advantages of simple structure, convenient assembly, reliable operation, long service life, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a schematic structural diagram of an embodiment of the utility model.

[0025] Attached Figure 2 The figure is a schematic diagram of the explosion structure of an embodiment of the utility model.

[0026] Attached Figure 3 This is a schematic diagram of the structure of an embodiment of the utility model after removing the first shell.

[0027] Attached Figure 4 It is a schematic diagram of the structure of the first middle shell of an embodiment of the utility model.

[0028] Attached Figure 5 It is a schematic diagram of the explosion structure at the release of an embodiment of the utility model.

[0029] Attached Figure 6 This is a schematic diagram of the structure of the test button of the embodiment of the utility model.

[0030] Attached Figure 7 It is a schematic structural diagram of the first shell of an embodiment of the utility model.

[0031] In the figure, 1, housing; 11, first housing; 111, support frame; 12, second housing; 13, first cavity; 14, first middle housing; 141, limit plate; 142, limit column; 15, second cavity; 16, second middle housing; 2, first terminal; 21, wire; 3, first contact mechanism; 31, first static contact piece; 32, first moving contact piece; 4, tripping mechanism; 41, tripping rod; 5, zero sequence mutual inductor; 6, control circuit board; 61, The first conductive member; 62, the second conductive member; 7, the release; 71, the transmission rod; 711, the transmission inclined plane; 712, the limiting hole; 72, the release drive rod; 8, the test button; 81, the first elastic member; 811, the first leg; 812, the second leg; 82, the pressing part; 83, the supporting member; 831, the guide hole; 84, the guiding part; 85, the second elastic member; 86, the hook part; 9, the reset button; 91, the third elastic member; 92, the limiting part. DETAILED DESCRIPTION

[0032] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings:

[0033] Depend on Figure 1 In combination with Figures 2-7, a circuit breaker with residual current protection function includes a housing 1, wherein the housing 1 includes a first housing 11 and a second housing 12, wherein the first housing 11 and the second housing 12 form a first cavity 13; wherein a first wiring terminal 2, a first contact mechanism 3 and a tripping mechanism 4 are arranged in the housing 1, wherein the first wiring terminal 2 is connected to the first contact mechanism 3 through a wire 21, wherein the first contact mechanism 3 includes a first stationary contact piece 31 and a first moving contact piece 32; and further includes:

[0034] A first middle shell 14, wherein the first middle shell 14 and the first shell 11 cooperate with each other to form a second cavity 15;

[0035] The zero-sequence mutual inductor 5 is arranged in the housing 1 and is used to realize the leakage protection function. The wire 21 passes through the zero-sequence mutual inductor 5;

[0036] The control circuit board 6 is disposed in the second cavity 15 and connected to the zero-sequence transformer 5; the control circuit board 6 is provided with a first conductive member 61 and a second conductive member 62;

[0037] The release device 7 is arranged in the second chamber 15 and connected to the control circuit board 6. The control circuit board 6 controls the action of the release device 7 so that the release mechanism 4 is actuated to release the circuit.

[0038] A test button 8 is provided on the housing 1 and inserted into the second cavity 15;

[0039] A first elastic member 81, wherein the first elastic member 81 comprises a first leg 811 and a second leg 812, wherein the first leg 811 is in contact with the first conductive member 61, and the second leg 812 is in contact with the test button 8 and is in contact with the second conductive member 62 when the test button 8 is pressed, so that the circuit is turned on and the release device 7 is tripped;

[0040] The reset button 9 is arranged in the second cavity 15 and is used to maintain the position of the release 7. The beneficial effects of the utility model are that the test button forms a passage through the first elastic member, the structure is simple, the circuit conduction is convenient to assemble, and the test is reliable. The setting of the reset button facilitates the release to operate smoothly and reset reliably. The utility model also has the advantages of simple structure, convenient assembly, reliable operation, and long service life.

[0041] The test button 8 includes a pressing portion 82, and the pressing portion 82 is arranged toward the first middle shell 14. The second leg 812 abuts against the pressing portion 82 and has a tendency to drive the test button 8 away from the control circuit board 6. The pressing portion is arranged toward the first middle shell and cooperates with the first middle shell to limit the second leg, so that the second leg moves smoothly and is convenient for reliable connection with the second conductive member.

[0042] The utility model further comprises a support member 83, on which a guide hole 831 is provided, and on which a guide portion 84 is provided on the test button 8, and the guide portion 84 is arranged through the guide hole 831. The arrangement of the guide hole and the guide portion facilitates the reliable reciprocating movement of the test button, and the test button is reliably limited and easy to reset.

[0043] The support member 83 is arranged in a "J" shape, and a second elastic member 85 is arranged on the support member 83. The second elastic member 85 abuts against the test button 8 and has a movement tendency of driving the test button 8 away from the control circuit board 6. The test button 8 is provided with a hook portion 86 adapted to the housing 1. Specifically, the support member 83 is arranged on the first middle housing 14 and is detachably connected to the first middle housing 14. The first housing 11 is provided with a support frame 111, and the support member 83 is arranged on the support frame 111. The structure of the support member can support the second elastic member, which is convenient for the processing of the first middle housing, and has a simple structure and convenient assembly.

[0044] The utility model also includes a second middle shell 16, the first middle shell 14 and the second middle shell 16 cooperate with each other and cover the first contact mechanism 3; the first cavity 13 is connected to the second cavity 15, the zero-sequence transformer 5 is vertically placed in the first cavity 13, and the zero-sequence transformer 5 is arranged between the first contact mechanism 3 and the first terminal 2. Such a structure, through the cooperation of the first middle shell and the second middle shell to cover the first contact mechanism, in fact, a set of contact system is also provided at the second middle shell and the second shell, which can separate the control circuit board and the first contact mechanism, avoid the control circuit board from being burned, and affect the service life of the product, the product is simpler, there are fewer parts in the second cavity, and it is easy to assemble. The zero-sequence transformer is installed on the side, which makes rational use of the space in the shell, has a simple structure, and does not increase the overall thickness of the product.

[0045] The utility model further includes a transmission rod 71, and the release mechanism 4 is provided with a release rod 41, and the release rod 41 passes through the first middle shell 14 and is arranged in the second cavity 15. The release device 7 drives the transmission rod 71 to rotate and drive the release rod 41 to move so that the release mechanism 4 is released. The utility model drives the release rod to move through the transmission rod so that the release mechanism is released, so that the first moving contact piece and the first stationary contact piece are separated, and the structure is simple, the assembly is convenient, and the transmission is reliable.

[0046] The utility model also includes a third elastic member 91, the release device 7 includes a release drive rod 72, the transmission rod 71 is hinged on the first middle shell 14, one end of the transmission rod 71 is connected to the release drive rod 72 and driven by the release drive rod 72 to move, and the other end is set toward the reset button 9, the third elastic member 91 is against the reset button 9 and has a tendency to drive the reset button 9 away from the shell 1; the reset button 9 has a first position limited by the transmission rod 71 and a second position driven by the third elastic member 91 to move when it is released; the reset button 9 is against the transmission rod 71 to limit the transmission rod 71 when it is in the second position. Such a structure makes the reset button simple in structure and stable and reliable in action.

[0047] The reset button 9 is provided with a limiting portion 92, and the transmission rod 71 is provided with a transmission inclined surface 711 and a limiting hole 712. When the reset button 9 is in the first position, the limiting portion 92 is inserted into the limiting hole 712 and is limited by the transmission rod 71. When the reset button 9 is in the second position, it is offset against the transmission inclined surface 711 to limit the swing of the transmission rod 71. Specifically, the first middle shell 14 is provided with a limiting plate 141 and a limiting column 142. The limiting plate 141 is inserted into the reset button 9 to limit the reset button 9, and the limiting column 142 is provided on the motion track of the tripping drive rod 72 to limit the motion of the tripping drive rod 72. Specifically, the test button is protruding from the housing when not being tested. When the test button is pressed, the second leg of the first elastic member driven by the test button contacts the second conductive member, so that the circuit of the control circuit board is turned on, and the tripping drive rod on the control release is pulled back. At this time, the transmission rod drives the tripping rod to trip, and the reset button is reset under the drive of the third elastic member and protrudes from the housing. The limit part on the reset button presses against the transmission inclined surface to limit the rotation of the transmission rod. When the reset button is pressed, the setting of the transmission inclined surface makes the reset button move more smoothly. The tripping drive rod is reset under the drive of the elastic member, so that the limit part of the reset button is inserted into the limit hole, and the reset button is retained. The setting of the limit column can limit the movement of the tripping drive rod to prevent the tripping drive rod from moving too much.

[0048] 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.

[0049] 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.

[0050] 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 circuit breaker with a residual current protection function, comprising a housing (1), wherein the housing (1) comprises a first housing (11) and a second housing (12), wherein the first housing (11) and the second housing (12) form a first cavity (13); a first wiring terminal (2), a first contact mechanism (3) and a tripping mechanism (4) are arranged in the housing (1), wherein the first wiring terminal (2) and the first contact mechanism (3) are connected via a wire (21), and the first contact mechanism (3) comprises a first stationary contact piece (31) and a first movable contact piece (32); characterized in that Also included: A first middle shell (14), wherein the first middle shell (14) and the first shell (11) cooperate with each other to form a second cavity (15); A zero-sequence mutual inductor (5) is arranged in the housing (1) and is used to realize a leakage protection function. The conductor (21) is arranged to pass through the zero-sequence mutual inductor (5); A control circuit board (6) is disposed in the second cavity (15) and connected to the zero-sequence transformer (5); the control circuit board (6) is provided with a first conductive member (61) and a second conductive member (62); A release device (7) is disposed in the second chamber (15) and is connected to the control circuit board (6), and its action is controlled by the control circuit board (6) so that the release mechanism (4) is actuated to release; A test button (8) is provided on the housing (1) and is inserted into the second cavity (15); A first elastic member (81), the first elastic member (81) comprising a first leg (811) and a second leg (812), the first leg (811) being in contact with the first conductive member (61), the second leg (812) being in contact with the test button (8) and being in contact with the second conductive member (62) when the test button (8) is pressed, so that the circuit is turned on and the release device (7) is tripped; A reset button (9) is disposed in the second cavity (15) and is used to maintain the position of the release device (7).

2. A circuit breaker with residual current protection function according to claim 1, characterized in that The test button (8) comprises a pressing portion (82), the pressing portion (82) being arranged toward the first middle shell (14), and the second leg (812) being in contact with the pressing portion (82) and having a movement tendency of driving the test button (8) away from the control circuit board (6).

3. A circuit breaker with residual current protection function according to claim 1, characterized in that It also comprises a support member (83), wherein the support member (83) is provided with a guide hole (831), and the test button (8) is provided with a guide portion (84), wherein the guide portion (84) is arranged through the guide hole (831).

4. A circuit breaker with residual current protection function according to claim 3, characterized in that The support member (83) is arranged in a "J" shape, and a second elastic member (85) is provided on the support member (83). The second elastic member (85) abuts against the test button (8) and has a tendency to drive the test button (8) to move away from the control circuit board (6). The test button (8) is provided with a hook portion (86) adapted to the housing (1).

5. A circuit breaker with residual current protection function according to claim 3, characterized in that The support member (83) is disposed on the first middle shell (14) and is detachably connected to the first middle shell (14); a support frame (111) is disposed on the first shell (11); and the support member (83) is disposed on the support frame (111).

6. A circuit breaker with residual current protection function according to claim 1, characterized in that The invention also comprises a second middle shell (16), wherein the first middle shell (14) and the second middle shell (16) cooperate with each other and cover the first contact mechanism (3); the first cavity (13) is connected to the second cavity (15), the zero-sequence mutual inductor (5) is vertically placed in the first cavity (13), and the zero-sequence mutual inductor (5) is arranged between the first contact mechanism (3) and the first terminal (2).

7. A circuit breaker with residual current protection function according to claim 1, characterized in that The release device (7) further comprises a transmission rod (71), wherein the release mechanism (4) is provided with a release rod (41), wherein the release rod (41) passes through the first middle shell (14) and is arranged in the second cavity (15), and wherein the release device (7) drives the transmission rod (71) to rotate to drive the release rod (41) to move so that the release mechanism (4) is released.

8. A circuit breaker with residual current protection function according to claim 7, characterized in that The release device (7) further comprises a third elastic member (91), the release device (7) comprising a release drive rod (72), the drive rod (71) being hinged to the first middle shell (14), one end of the drive rod (71) being connected to the release drive rod (72) and being driven to move by the release drive rod (72), and the other end being arranged toward the reset button (9), the third elastic member (91) being against the reset button (9) and having a tendency to drive the reset button (9) away from the shell (1); the reset button (9) having a first position limited by the drive rod (71) and a second position driven to move by the third elastic member (91) when released; when the reset button (9) is in the second position, it is against the drive rod (71) to limit the drive rod (71).

9. A circuit breaker with residual current protection function according to claim 8, characterized in that The reset button (9) is provided with a limiting portion (92), and the transmission rod (71) is provided with a transmission inclined surface (711) and a limiting hole (712); when the reset button (9) is in a first position, the limiting portion (92) is inserted into the limiting hole (712) and is limited by the transmission rod (71); when the reset button (9) is in a second position, the limiting portion (92) is opposed to the transmission inclined surface (711) to limit the swing of the transmission rod (71).

10. A circuit breaker with residual current protection function according to claim 8, characterized in that The first middle shell (14) is provided with a limit plate (141) and a limit column (142); the limit plate (141) is inserted into the reset button (9) for limiting the reset button (9); the limit column (142) is provided on the movement track of the release drive rod (72) for limiting the movement of the release drive rod (72).

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