A plug that can actively provide leakage protection

Abstract

The present invention discloses a plug capable of actively providing leakage protection, which includes a housing, a circuit board, a live pin, a neutral pin and a ground pin. The circuit board, the live pin, the neutral pin and the ground pin are relatively fixedly installed on the housing. A crossbar is hinged in the housing, and a live movable piece, a neutral movable piece and a ground movable piece are respectively arranged on the crossbar. A reset spring for disconnecting the static contact from the dynamic contact is arranged between the housing and the crossbar. The front end of the crossbar is connected to a locking bar hinged in the housing, and the rear end of the locking bar is connected to a moving armature. An electromagnet assembly is also arranged in the housing. After the output end of the electromagnet assembly is energized, it attracts the moving armature to drive the locking bar to rotate backward around the rotating shaft, thereby driving the crossbar to rotate forward around the rotating shaft to connect the static contact with the dynamic contact. The electromagnet assembly is electrically connected to the circuit board, realizing the functions of detecting the disconnection or absence of the neutral line at the power supply end and actively providing leakage protection when the neutral line and the ground line at the output end are electrified without manual reset.

Description

Technical Field

[0001] The present invention relates to a plug that can actively provide leakage protection. Background Art

[0002] Currently, the existing leakage protection plugs in China have the following fatal safety hazards.

[0003] When the power is turned on, if the live wire voltage at the power supply end is normal while the neutral wire is disconnected or missing, the existing leakage protection plugs in China will not disconnect. At the same time, in this case, the power indicator light will not light up, and pressing the test button will not cause disconnection either. Therefore, users may mistakenly think that the leakage protection has been disconnected and carry out live operations, resulting in electric shock accidents.

[0004] If the existing leakage protection plugs in China need to be manually pressed the reset power-on button from the disconnected state to the connected state, it is neither convenient nor safe. Summary of the Invention

[0005] The present invention overcomes the above-mentioned deficiencies in the technology and provides a plug that can detect the disconnection or absence of the neutral wire at the power supply end, can actively provide leakage protection when the neutral wire and the ground wire at the output end are energized, and does not require manual reset.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A plug capable of actively providing leakage protection according to the present invention includes a housing 1, a circuit board 2, a live pin 31, a neutral pin 32, and a ground pin 33. The circuit board 2, the live pin 31, the neutral pin 32, and the ground pin 33 are relatively fixedly installed on the housing 1. It is characterized in that static contacts 30 are respectively provided at one ends of the live pin 31, the neutral pin 32, and the ground pin 33 located inside the housing 1. A crossbar 4 is hinged inside the housing 1. Fire live pieces 51, neutral live pieces 52, and ground live pieces 53 are respectively provided on the crossbar 4. Moving contacts 50 for contacting the static contacts 30 are correspondingly provided at the front ends of the fire live pieces 51, the neutral live pieces 52, and the ground live pieces 53. The rear ends of the fire live pieces 51, the neutral live pieces 52, and the ground live pieces 53 are respectively electrically connected to the corresponding output live wire, neutral wire, and ground wire. A return spring 5 for disconnecting the static contact 30 from the moving contact 50 is provided between the housing 1 and the crossbar 4. The front end of the crossbar 4 is connected to a locking bar 6 hinged inside the housing 1. The rear end of the locking bar 6 is connected to a moving armature 7. An electromagnet assembly 8 is further provided inside the housing 1. The moving armature 7 is arranged at the output end of the electromagnet assembly 8. After the output end of the electromagnet assembly 8 is energized, it attracts the moving armature 7 to make the locking bar 6 rotate backward around the rotating shaft, thereby driving the crossbar 4 to rotate forward around the rotating shaft to connect the static contact 30 with the moving contact 50. The circuit board 2 is respectively electrically connected to the live pin 31, the neutral pin 32, and the ground pin 33. The electromagnet assembly 8 is electrically connected to the circuit board 2.

[0008] A plug capable of actively providing leakage protection as described above is characterized in that the housing 1 includes an upper housing 11 and a lower housing 12. The circuit board 2 is fixed on the upper housing 11. An inner housing 13 is fixed on the bottom surface of the circuit board 2 and is located above the crossbar 4. A locking bar installation cavity 131 and an electromagnet assembly installation cavity 132 are provided on the inner housing 13. The locking bar 6 is hinged in the locking bar installation cavity 131. The electromagnet assembly 8 is fixed in the electromagnet assembly installation cavity 132. The moving armature 7 extends into the locking bar installation cavity 131 and is connected to the locking bar 6. The return spring 5 is arranged between the crossbar 4 and the inner housing 13.

[0009] A plug capable of actively providing leakage protection as described above is characterized in that an elastic member 22 with one end fixed to the circuit board 2 is provided on the inner housing 13. The elastic end of the elastic member 22 elastically presses the vertical connecting rod portion 62 backward. A limiting convex block 23 for limiting the elastic end of the elastic member 22 is further provided on the inner housing 13.

[0010] A plug that can actively provide leakage protection as described above, characterized in that the locking bar 6 includes a vertical opening 61 for clamping with the front end of the moving armature 7, and a vertical connecting rod 62 for being pushed forward by the passive armature 7. A middle connecting part 63 for connecting with the cross bar 4 is connected between the vertical opening 61 and the vertical connecting rod 62, and the locking shaft is arranged at the lower end of the vertical connecting rod 62.

[0011] A plug that can actively provide leakage protection as described above, characterized in that an opening 21 is provided on the circuit board 2, the upper end of the vertical connecting rod 62 passes through the opening 21, and a power indicator window 111 for viewing the vertical opening 61 when the locking bar 6 rotates backward to connect the power supply is provided on the top surface of the housing 1.

[0012] A plug that can actively provide leakage protection as described above, characterized in that the opening 21 prevents the locking bar 6 from directly colliding with the circuit board 2 when it rotates forward.

[0013] A plug that can actively provide leakage protection as described above, characterized in that side arms 64 for connecting with the cross bar 4 are respectively provided on both sides of the middle connecting part 63.

[0014] A plug that can actively provide leakage protection as described above, characterized in that a test power-off button 10 for disconnecting the electrical connection between the circuit board 2 and the electromagnet assembly 8 when pressed is provided on the housing 1, and a reset power-on button 9 for connecting the electrical connection between the circuit board 2 and the electromagnet assembly 8 when pressed is provided on the housing 1.

[0015] A plug that can actively provide leakage protection as described above, characterized in that the electromagnet assembly 8 includes an electromagnet 81 electrically connected to the circuit board 2, a concave hole 82 is provided on the electromagnet 81, the moving armature 7 is arranged in the concave hole 82, and a top spring 83 is provided between the moving armature 7 and the concave hole 82.

[0016] A plug that can actively provide leakage protection as described above, characterized in that the circuit board 2 is connected with a neutral zero-sequence current transformer 14 sleeved on the neutral wire at the output end of the neutral moving contact piece 52 and used for detecting whether the output neutral wire is leaking, and the circuit board 2 is connected with a ground zero-sequence current transformer 15 sleeved on the ground wire at the output end of the ground moving contact piece 53 and used for detecting whether the output ground wire is leaking.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention can detect that the live wire voltage at the power supply end is normal while the neutral wire is disconnected or missing. At this time, a loop cannot be formed, the circuit board is not powered on, so the electromagnet assembly is in a power-off state and does not work, the moving contact and the static contact are disconnected, and the plug does not connect the power supply.

[0019] 2. The plug of the present invention does not require manual reset for power-on. When the power supply is connected or the fault is eliminated and the power supply voltage is normal, the electromagnet assembly is powered on to work, attracting the moving armature to rotate the locking bar backward, thereby driving the cross bar to rotate forward around the rotating shaft to connect the static contact and the moving contact. At this time, the plug is powered on. [Description of the Drawings]

[0020] Figure 1 It is a perspective view of the present invention;

[0021] Figure 2 It is one of the internal structure diagrams of the present invention;

[0022] Figure 3 It is another internal structure diagram of the present invention;

[0023] Figure 4 It is the third internal structure diagram of the present invention;

[0024] Figure 5 It is a partial internal structure diagram of the present invention;

[0025] Figure 6 It is a cross-sectional view of the cooperation between the locking bar and the cross bar when the circuit of the present invention is in the disconnected state;

[0026] Figure 7 It is a cross-sectional view of the cooperation between the static contact and the moving contact when the circuit of the present invention is in the disconnected state;

[0027] Figure 8 It is a cross-sectional view of the cooperation between the locking bar and the cross bar when the circuit of the present invention is in the connected state;

[0028] Figure 9 It is a cross-sectional view of the cooperation between the static contact and the moving contact when the circuit of the present invention is in the connected state; [Detailed Embodiment]

[0029] The following is a more detailed description of the embodiments of the present invention in conjunction with the drawings:

[0030] As Figures 1-9As shown in the figure, a plug capable of actively providing leakage protection includes a housing 1, a circuit board 2, a live pin 31, a neutral pin 32, and a ground pin 33. The live pin 31, neutral pin 32, and ground pin 33 are relatively fixedly installed on the housing 1. One ends of the live pin 31, neutral pin 32, and ground pin 33 located inside the housing 1 are respectively provided with static contacts 30. A crossbar 4 is hinged inside the housing 1. The crossbar 4 is respectively provided with a live moving piece 51, a neutral moving piece 52, and a ground moving piece 53. The front ends of the live moving piece 51, neutral moving piece 52, and ground moving piece 53 are correspondingly provided with moving contacts 50 for contacting the static contacts 30. The rear ends of the live moving piece 51, neutral moving piece 52, and ground moving piece 53 are respectively electrically connected to the corresponding output live wire, neutral wire, and ground wire. A return spring 5 for disconnecting the static contact 30 from the moving contact 50 is provided between the housing 1 and the crossbar 4. The front end of the crossbar 4 is connected to a locking bar 6 hinged inside the housing 1. The rear end of the locking bar 6 is connected to a moving armature 7. An electromagnet assembly 8 is also provided inside the housing 1. The moving armature 7 is arranged at the output end of the electromagnet assembly 8. After the output end of the electromagnet assembly 8 is powered on, it attracts the moving armature 7 to make the locking bar 6 rotate backward around the rotation axis, thereby driving the crossbar 4 to rotate forward around the rotation axis to connect the static contact 30 with the moving contact 50. The circuit board 2 is respectively electrically connected to the live pin 31, neutral pin 32, and ground pin 33. The electromagnet assembly 8 is electrically connected to the circuit board 2.

[0031] As Figure 3 shown in the figure, the housing 1 includes an upper housing 11 and a lower housing 12. The circuit board 2 is fixed on the upper housing 11. An inner housing 13 is fixed on the bottom surface of the circuit board 2 and is located above the crossbar 4. Through the inner housing 13, better close linkage work can be realized between various components. The inner housing 13 is provided with a locking bar installation cavity 131 and an electromagnet assembly installation cavity 132. The locking bar 6 is hinged in the locking bar installation cavity 131. The electromagnet assembly 8 is fixed in the electromagnet assembly installation cavity 132. The moving armature 7 extends into the locking bar installation cavity 131 to be connected to the locking bar 6. The return spring 5 is arranged between the crossbar 4 and the inner housing 13. Specifically, the return spring 5 is arranged between the lower end surface of the rear side extension of the inner housing 13 and the upper end surface of the crossbar 4, which can better reset the crossbar 4 to disconnect the contact connection.

[0032] As Figures 6-7As shown, there is no power supply in the original state, the electromagnet assembly 8 is not working, the moving armature 7 has no acting force on the lock carrier 6, and it moves forward under the elastic force of the ejector spring 83 of the electromagnet assembly 8, pushing the lock carrier 6 to rotate forward around the lock carrier rotating shaft, so that the lock carrier 6 releases the pressure on the cross arm 4, thereby enabling the cross arm 4 to rotate backward around the cross arm rotating shaft under the elastic force of the return spring 5, driving the live contact piece 51, neutral contact piece 52, and ground contact piece 53 fixed on the cross arm 4 to rotate, and disconnecting the moving contact 50 and the static contact 30. At this time, the leakage protection plug automatically and actively is in the off state.

[0033] As Figures 8-9 shown, when the power supply is connected and the power supply voltage is normal, the electromagnet assembly 8 works to attract the moving armature 7, and the moving armature 7 drives the lock carrier 6 to rotate backward around the lock carrier rotating shaft, thereby pressing the cross arm 4 to rotate forward around the cross arm rotating shaft, driving the live contact piece 51, neutral contact piece 52, and ground contact piece 53 fixed on the cross arm 4 to rotate, and connecting the moving contact 50 and the static contact 30. At this time, the leakage protection plug outputs power.

[0034] Therefore, after the power supply is connected, when the live wire voltage at the power supply end is normal while the neutral wire is disconnected or missing, a loop cannot be formed, the circuit board is not powered on, the electromagnet assembly is in the power-off state and does not work, the moving contact and the static contact are in the disconnected state, and the plug does not connect to the power supply; at the same time, it realizes automatically connecting or disconnecting the power supply according to the presence or absence of voltage at the power supply end, without manual reset.

[0035] As Figures 2-3 shown, an elastic member 22 with one end fixed to the circuit board 2 is provided on the inner shell 13, the elastic end of the elastic member 22 elastically presses the vertical link portion 62 backward, and a limiting convex block 23 for limiting the elastic end of the elastic member 22 is further provided on the inner shell 13. The elastic member 22 is a torsion spring, and the limiting convex block 23 defines the stop position of the elastic end of the torsion spring. The elastic end of the elastic member 22 presses the vertical link portion 62 to provide a buffering force, preventing the vertical link portion 62 of the lock carrier 6 from directly hitting the circuit board 2 after the electromagnet assembly 8 is powered off. At the same time, as Figure 2 shown, the opening 21 prevents the protective block 24 on the circuit board 2 from being directly collided when the lock carrier 6 rotates forward, and a vertical convex rib is provided on the front side of the vertical link portion 62 of the lock carrier 6 to prevent the vertical link portion 62 of the lock carrier 6 from directly hitting the circuit board 2, further protecting the circuit board 2.

[0036] As Figures 2-5As shown, the lock carrier 6 includes a vertical opening 61 for clamping with the front end of the moving armature 7, and a vertical connecting rod portion 62 for being pushed forward by the moving armature 7. A middle connecting portion 63 for connecting with the cross arm 4 is connected between the vertical opening 61 and the vertical connecting rod portion 62. The lock catch rotating shaft is arranged at the lower end of the vertical connecting rod portion 62 and is hinged in the lock carrier installation cavity 131 of the inner shell 13. Side arms 64 for connecting with the cross arm 4 are respectively arranged on both sides of the middle connecting portion 63. By means of the side arms 64, the cross arm 4 is better pressed to rotate forward, so as to better drive the live wire moving piece 51, the neutral wire moving piece 52, and the ground wire moving piece 53 fixed on the cross arm 4 to rotate, so that the moving contact 50 and the static contact 30 are connected.

[0037] As Figure 1 , Figure 2 and Figure 8 shown, an opening 21 is provided on the circuit board 2, and the upper end of the vertical connecting rod portion 62 passes through the opening 21. A power indicator window 111 for viewing the vertical opening 61 when the lock carrier 6 rotates backward to turn on the power is provided on the top surface of the housing 1. When the electromagnet assembly 8 is attracted to work, the moving armature 7 pulls the lock carrier 6 to rotate backward, so that the vertical connecting rod portion 62 rotates to the rear side of the opening 21. As Figure 8 shown, at this time, the vertical connecting rod portion 62 can be viewed through the power indicator window 111, and the vertical connecting rod portion 62 is red, which is more convenient for viewing. Similarly, when the electromagnet assembly 8 does not work, the power indicator window 111 is empty, realizing the mechanical power indication function and more intuitively viewing the energized state of the plug.

[0038] As Figure 1 shown, a test power-off button 10 for connecting with the circuit board 2 and disconnecting the electrical connection between the circuit board 2 and the electromagnet assembly 8 when pressed is provided on the housing 1. A reset power-on button 9 for connecting with the circuit board 2 and connecting the electrical connection between the circuit board 2 and the electromagnet assembly 8 when pressed is provided on the housing 1. When the test power-off button 10 is pressed, the circuit board 2 receives a power-off signal and disconnects the power supply to the electromagnet assembly 8, and the lock carrier 6 rotates forward around the rotating shaft, and the static contact 30 and the moving contact 50 are disconnected, so that the plug is powered off. When the reset power-on button 9 is pressed, the circuit board 2 receives a power-on signal and connects the power supply to the electromagnet assembly 8 to attract the moving armature 7, driving the lock catch 6 to rotate backward, and the static contact 30 and the moving contact 50 are connected, so that the plug is powered on again.

[0039] As Figures 3-4As shown, the circuit board 2 is connected with a zero-sequence current transformer 14 of the neutral line, which is sleeved on the neutral line at the output end of the neutral line moving piece 52 and used to detect whether the neutral line at the output end is leaking electricity. The circuit board 2 is connected with a zero-sequence current transformer 15 of the ground line, which is sleeved on the ground line at the output end of the ground line moving piece 53 and used to detect whether the ground line at the output end is leaking electricity. When the zero-sequence current transformer 14 of the neutral line detects that the neutral line at the output end is leaking electricity and the zero-sequence current transformer 15 of the ground line detects that the ground line at the output end is leaking electricity, a leakage signal is sent to the circuit board 2. At this time, the circuit board 2 disconnects the power supply of the electromagnet assembly 8, thereby disconnecting the static contact 30 and the moving contact 50 to cut off the power supply of the plug.

[0040] After the leakage protection plug in this case is disconnected under the fault conditions such as abnormal voltage between the neutral and live wires at the power supply end, the neutral wire at the power supply end being energized, the ground wire at the power supply end being energized, the neutral wire at the output end being energized, and the ground wire at the output end being energized, when the power supply is reconnected and the power supply voltage is normal, there is no need for manual reset, and the leakage protection plug can automatically connect to the power supply.

[0041] As Figure 6 and Figure 8 As shown, the electromagnet assembly 8 includes an electromagnet 81 electrically connected to the circuit board 2. The electromagnet 81 is provided with a concave hole 82. The moving armature 7 is arranged in the concave hole 82. A top spring 83 is arranged between the moving armature lock 7 and the concave hole 82. As Figure 7 and Figure 9 As shown, the housing 1 includes an upper housing 11 and a lower housing 12. The return spring 5 presses against the lower end face of the upper housing 11 and the upper end face of the rear end of the crossbar 4. When the electromagnet 81 is not energized, the top spring 83 pushes the moving armature 7 out of the concave hole 82. At this time, the moving armature 7 does not drive the lock 6 to rotate and press the crossbar 4. The crossbar 4 disconnects the contact 50 and the static contact 30 under the elastic force of the return spring 5. When the electromagnet 81 is energized, it attracts the moving armature 7 to drive the lock 6 and the crossbar 4 to connect the contact 50 and the static contact 30.

Claims

1. A plug that can actively provide leakage protection, comprising a housing (1), a circuit board (2), a live pin (31), a neutral pin (32), and a ground pin (33). The circuit board (2), live pin (31), neutral pin (32), and ground pin (33) are relatively fixedly installed on the housing (1), and it is characterized in that: One end of the live pin (31), neutral pin (32) and ground pin (33) located inside the housing (1) is respectively provided with a static contact (30). A crossbar (4) is hinged inside the housing (1). The crossbar (4) is respectively provided with a live moving piece (51), a neutral moving piece (52) and a ground moving piece (53). The front ends of the live moving piece (51), neutral moving piece (52) and ground moving piece (53) are respectively provided with moving contacts (50) for contacting the static contact (30). The rear ends of the live moving piece (51), neutral moving piece (52) and ground moving piece (53) are respectively electrically connected to the corresponding output live wire, neutral wire and ground wire. A return spring (5) for disconnecting the static contact (30) from the moving contact (50) is provided between the housing (1) and the crossbar (4). The front end of the crossbar (4) is connected to a locking bar (6) hinged inside the housing (1). The rear end of the locking bar (6) is connected to a moving armature (7). An electromagnet assembly (8) is also provided inside the housing (1). The moving armature (7) is arranged at the output end of the electromagnet assembly (8). After the output end of the electromagnet assembly (8) is powered on, it attracts the moving armature (7) to rotate the locking bar (6) backward around the rotating shaft, thereby driving the crossbar (4) to rotate forward around the rotating shaft to connect the static contact (30) with the moving contact (50). The circuit board (2) is respectively electrically connected to the live pin (31), neutral pin (32) and ground pin (33). The electromagnet assembly (8) is electrically connected to the circuit board (2). The locking bar (6) includes a vertical opening part (61) for clamping with the front end of the moving armature (7), a vertical connecting rod part (62) for being pushed forward by the moving armature (7). A middle connecting part (63) for connecting with the crossbar (4) is connected between the vertical opening part (61) and the vertical connecting rod part (62). The locking shaft is arranged at the lower end of the vertical connecting rod part (62). The electromagnet assembly (8) includes an electromagnet (81) electrically connected to the circuit board (2). The electromagnet (81) is provided with a concave hole (82). The moving armature (7) is arranged in the concave hole (82). A ejecting spring (83) is arranged between the moving armature (7) and the concave hole (82).

2. The plug capable of actively providing leakage protection according to claim 1, wherein: The housing (1) includes an upper housing (11) and a lower housing (12). The circuit board (2) is fixed on the upper housing (11). An inner housing (13) is fixed on the bottom surface of the circuit board (2) and is located above the crossbar (4). The inner housing (13) is provided with a locking bar installation cavity (131) and an electromagnet assembly installation cavity (132). The locking bar (6) is hinged in the locking bar installation cavity (131). The electromagnet assembly (8) is fixed in the electromagnet assembly installation cavity (132). The moving armature (7) extends into the locking bar installation cavity (131) to be connected with the locking bar (6). The return spring (5) is arranged between the crossbar (4) and the inner housing (13).

3. The plug capable of actively providing leakage protection according to claim 2, characterized in that: An elastic member (22) with one end fixed to the circuit board (2) is provided on the inner shell (13). The elastic end of the elastic member (22) elastically presses the vertical link portion (62) backward, and a limiting projection (23) for limiting the elastic end of the elastic member (22) is further provided on the inner shell (13).

4. The plug capable of actively providing leakage protection according to claim 1, wherein: An opening (21) is provided on the circuit board (2). The upper end of the vertical link portion (62) passes through the opening (21), and a power indicator window (111) for viewing the vertical opening portion (61) when the lock bar (6) rotates backward to connect the power supply is provided on the top surface of the housing (1).

5. The plug capable of actively providing leakage protection according to claim 4, characterized in that: The opening (21) is provided with a protective block (24) to prevent the lock bar (6) from directly colliding with the circuit board (2) when it rotates forward.

6. The plug capable of actively providing leakage protection according to claim 1, wherein: Side arms (64) connected to the cross bar (4) are respectively provided on both sides of the intermediate connection portion (63).

7. The plug capable of actively providing leakage protection according to claim 1, wherein: A test power-off button (10) that is connected to the circuit board (2) and disconnects the circuit board (2) from the electromagnetic solenoid assembly (8) when pressed is provided on the housing (1), and a reset power-on button (9) that is connected to the circuit board (2) and connects the circuit board (2) to the electromagnetic solenoid assembly (8) when pressed is provided on the housing (1).

8. A plug capable of actively providing leakage protection according to claim 1, characterized in that: The circuit board (2) is connected to a neutral zero-sequence current transformer (14) sleeved on the neutral wire at the output end of the neutral wire movable piece (52) and used for detecting whether the output neutral wire is leaking electricity, and the circuit board (2) is connected to a ground zero-sequence current transformer (15) sleeved on the ground wire at the output end of the ground wire movable piece (53) and used for detecting whether the output ground wire is leaking electricity.

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