Three-pole leakage protection plug

Abstract

The invention relates to a three-pole leakage protection plug, comprising a shell, a reset button, a live wire pin, a ground wire pin, a neutral wire pin, a tripping coil assembly, a mounting frame and a circuit board; the plug is characterized in that it comprises a live wire moving contact piece structure, a ground wire moving contact piece structure, a neutral wire moving contact piece structure and a pressure arm; the mounting frame is provided with a first mounting chamber and a second mounting chamber, the pressure arm is arranged in the second mounting chamber and can be twisted back and forth, the live wire moving contact piece structure comprises a live wire installation position and a live wire transverse spring piece, the neutral wire moving contact piece structure comprises a neutral wire installation position and a neutral wire transverse spring piece, the ground wire moving contact piece structure comprises a ground wire installation position and a ground wire transverse spring piece, the live wire transverse spring piece is borne on the right side of the bearing arm, the neutral wire transverse spring piece is borne on the left side of the bearing arm, and the ground wire transverse spring piece is borne in the middle of the bearing arm; the plug has the advantages of: no locking piece is required, less matching relationship, easy assembly, stable and reliable operation, and can realize the three-pole leakage protection plug with the function of ground wire contact first and then disconnection required by the national standard.

Description

Technical Field

[0001] The invention relates to a three-pole leakage protection plug. Background Art

[0002] The tripping mechanism of the existing three-pole leakage protection plug includes a mounting frame, a reset button, a pressure arm, a locking piece, a large and small spring, a tripping coil, a live wire static contact piece, a neutral wire static contact piece, a live wire pin, a neutral wire pin, a ground wire pin, a live wire moving contact piece, a neutral wire moving contact piece and an additional ground wire tripping mechanism. When working, the iron core of the tripper pushes and pulls the locking piece under the magnetic force of the small spring and the tripping coil to lock the pressure arm and the reset button into one or separate, and the reset button cooperates with the large spring to drive the live wire moving contact piece and the live wire static contact piece to be turned on and off, and the neutral wire moving contact piece and the neutral wire static contact piece to be turned on and off, and the ground wire tripping mechanism is linked to realize the turning on and off function of the ground wire moving contact piece and the ground wire static contact piece. The structure is complex, the coordination relationship is more, the manufacturing process of the key part locking piece is complex, the processing difficulty is large, and the production cost is high, so the product failure rate is high and the reliability is poor, and most of them cannot realize the function of the ground wire first contact and then disconnection required by the national standard. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a three-pole leakage protection plug with a simple structure, no need for a locking plate, fewer matching relationships, easy assembly, stable and reliable operation, and the ability to achieve the ground wire contact-first-then-disconnection function required by the national standard.

[0004] In order to achieve the above-mentioned purpose, the present invention is implemented as follows: it is a three-pole leakage protection plug, comprising a shell, a reset button, a live wire pin, a ground wire pin, a neutral wire pin, a trip coil assembly, a mounting frame and a circuit board; the live wire pin, the ground wire pin and the neutral wire pin are respectively installed in the shell, a live wire static contact is provided at the upper end of the live wire pin, a neutral wire static contact is provided at the upper end of the neutral wire pin, and a ground wire static contact is provided at the upper end of the ground wire pin, the mounting frame is installed in the shell, the circuit board is arranged on the mounting frame, and the reset button passes through the circuit board and can move up and down in the mounting frame; it is characterized in that the height of the ground wire pin is lower than the height of the live wire pin and the neutral wire pin, the mounting frame is respectively provided with a first mounting chamber and a second mounting chamber, longitudinal grooves are respectively provided on both sides of the second mounting chamber, the trip coil assembly is arranged in the first mounting chamber and is electrically connected to the circuit board; it also includes,

[0005] A live wire moving contact piece structure, a ground wire moving contact piece structure and a neutral wire moving contact piece structure; the live wire moving contact piece structure includes a live wire mounting position and a live wire transverse spring piece, the live wire mounting position is arranged on one side of the mounting frame, one end of the live wire mounting position is electrically connected to the circuit board, the other end of the live wire mounting position is connected to one end of the live wire transverse spring piece and the live wire transverse spring piece is tilted downward, the other end of the live wire transverse spring piece is provided with a live wire moving contact, the live wire moving contact can be electrically connected to the live wire static contact by contact; the neutral wire moving contact piece structure includes a neutral wire mounting position and a neutral wire transverse spring piece, the neutral wire mounting position is arranged on the other side of the mounting frame, one end of the neutral wire mounting position is electrically connected to the circuit board, the other end of the neutral wire mounting position is One end of the neutral line transverse spring piece is connected and causes the neutral line transverse spring piece to tilt downward, and a neutral line moving contact is provided at the other end of the neutral line transverse spring piece, and the neutral line moving contact can be electrically connected to the neutral line static contact by touching; the ground line moving contact piece structure includes a ground line mounting position and a ground line transverse spring piece, and the ground line mounting position is arranged on a mounting frame, one end of the ground line mounting position is connected to the ground line, and the other end of the ground line mounting position is connected to one end of the ground line transverse spring piece and causes the ground line transverse spring piece to tilt downward, the length of the ground line transverse spring piece is greater than the length of the live line transverse spring piece and the neutral line transverse spring piece, and a ground line moving contact is provided at the other end of the ground line transverse spring piece, and the ground line moving contact can be electrically connected to the ground line static contact by touching;

[0006] A pressure arm; a longitudinal slide groove is provided on one side of the upper part of the pressure arm, a raised lock buckle is provided on the other side of the upper part of the pressure arm, and a bearing arm is provided on the lower part of the pressure arm. The pressure arm is arranged in the second installation room and can be twisted back and forth, and the bearing arms are respectively located in the corresponding longitudinal grooves and can move up and down. The live wire transverse spring piece is borne on the right side of the bearing arm, the neutral wire transverse spring piece is borne on the left side of the bearing arm, and the ground wire transverse spring piece is borne on the middle part of the bearing arm. The lock buckle cooperates with the reset button hook, and the iron core of the tripping coil assembly is inserted in In the longitudinal slide groove of the pressure arm, the iron core can pull the longitudinal slide groove of the pressure arm to twist backward with the bearing arm as the axis, and the lock on the other side of the pressure arm disengages from the reset button. The ground wire installation position, the live wire installation position and the neutral wire installation position respectively make the ground wire transverse spring sheet, the live wire transverse spring sheet and the neutral wire transverse spring sheet tilt downward, thereby pushing the pressure arm to slide downward along the longitudinal groove; the neutral wire moving contact and the neutral wire static contact are disengaged and disconnected from each other, the live wire moving contact and the live wire static contact are disengaged and disconnected from each other, and the ground wire moving contact and the ground wire static contact are disengaged and disconnected from each other.

[0007] In the present technical scheme, a slide groove is provided next to the second installation chamber, and the reset button includes a reset rod, a button and a reset spring, the reset rod is provided above the circuit board and moves up and down in the slide groove, the button is provided at the upper end of the reset rod and extends out of the shell, the reset spring is sleeved on the reset rod and is located between the circuit board and the reset button, and a hook and a guide inclined surface provided at the lower part of the hook are provided at the lower end of the reset rod; the lock of the pressure arm can be locked on the hook of the reset button, and the reset button can drive the pressure arm, the neutral line transverse spring piece and the live line transverse spring piece to move upward under the elastic force of the reset spring, the neutral line moving contact and the neutral line static contact are correspondingly touched and electrically connected, the ground line moving contact and the ground line static contact are correspondingly touched and electrically connected, and the live line moving contact and the live line static contact are correspondingly touched and electrically connected.

[0008] In the present technical solution, the tripping coil assembly also includes a coil and a spring; the coil is arranged in the first installation chamber and is electrically connected to the circuit board, the spring and the iron core are respectively located in the coil, the spring is located at the rear of the iron core, the iron core can move forward and backward in the coil, and an annular groove is provided at the protruding end of the iron core, the annular groove is clamped on the longitudinal slide groove, so that the longitudinal slide groove of the pressure arm can slide up and down along the annular groove.

[0009] In the technical solution, the live wire installation position includes a live wire longitudinal plug-in and a live wire bending piece, one end of the live wire longitudinal plug-in is electrically connected to the circuit board, the other end of the live wire longitudinal plug-in is connected to one end of the live wire bending piece, the other end of the live wire bending piece is connected to one end of the live wire transverse spring piece and the live wire transverse spring piece is tilted downward; the neutral wire installation position includes a neutral wire longitudinal plug-in and a neutral wire bending piece, one end of the neutral wire longitudinal plug-in is electrically connected to the circuit board, the other end of the neutral wire longitudinal plug-in is connected to one end of the neutral wire bending piece, the other end of the neutral wire bending piece is connected to the neutral wire transverse spring piece One end of the spring sheet is connected to the mounting frame and the horizontal spring sheet of the neutral line is tilted downward; a longitudinal sheet plug-in position and a bent sheet mounting column are respectively provided on both sides of the mounting frame; the live wire longitudinal plug-in position and the neutral wire longitudinal plug-in position are respectively plugged into the corresponding longitudinal sheet plug-in position, and the live wire bent sheet and the neutral wire bent sheet are respectively sleeved on the corresponding bent sheet mounting column; the ground wire mounting position includes a ground wire bent sheet, which is arranged on the mounting frame, one end of the ground wire bent sheet is electrically connected to the ground wire, and the other end of the ground wire bent sheet is connected to the ground wire horizontal spring sheet and the ground wire horizontal spring sheet is tilted downward.

[0010] In the technical solution, an opening is also provided on the pressure arm, and the opening is located above the middle of the bearing arm. The ground wire transverse spring piece is located in the opening and is supported on the bearing arm in the middle.

[0011] In the technical solution, a live wire pin plugging position, a ground wire pin plugging position and a neutral wire pin plugging position are respectively provided in the shell, the live wire pin is plugged into the live wire pin plugging position, the ground wire pin is plugged into the ground wire pin plugging position, and the neutral wire pin is plugged into the neutral wire pin plugging position.

[0012] In the technical solution, a test button and a light-transmitting cover are also provided on the circuit board; the tops of the test button and the light-transmitting cover extend out of the housing.

[0013] Compared with the prior art, the advantages of the present invention are: simple structure, no need for locking plates, fewer matching relationships, easy assembly, stable performance, reliable operation, and a three-pole leakage protection plug with the function of ground wire first contact and then disconnection that meets the national standard requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a stereogram of the present invention;

[0015] Figure 2 is an exploded view of the present invention;

[0016] Figure 3 is a three-dimensional diagram of the present invention with the outer shell removed;

[0017] Figure 4 yes Figure 3 A stereogram of the other side;

[0018] Figure 5 yes Figure 3 Top view

[0019] Figure 6 yes Figure 5 AA section view;

[0020] Figure 7 It is a schematic diagram of the structure coordination of the present invention without the housing, circuit board and mounting frame;

[0021] Figure 8 It is a schematic diagram of the structural coordination of the live wire moving contact piece structure, the neutral wire moving contact piece structure, the ground wire moving contact piece structure, the live wire plug pin, the neutral wire plug pin and the ground wire plug pin of the present invention;

[0022] Fig. 9 is a three-dimensional diagram of the mounting frame of the present invention;

[0023] Fig.10 It is a schematic diagram of the structure inside the housing of the present invention;

[0024] Fig.11 It is a schematic diagram of the cooperation between the tripping coil assembly and the tripping structure of the present invention;

[0025] Fig.12It is a schematic diagram of the structural coordination of the trip coil assembly, the mounting frame, the live wire moving contact piece structure, the neutral wire moving contact piece structure and the ground wire moving contact piece structure of the present invention;

[0026] Fig.13 It is a schematic structural diagram of power off of the present invention;

[0027] Fig.14 It is a structural schematic diagram of the manual reset of the present invention;

[0028] Fig.15 It is a schematic diagram of the structure of the present invention when it is powered on. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] In the description of the present invention, the directions or positional relationships indicated by the terms "left", "right", "bottom", "middle" and "top" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention rather than requiring that the present invention must be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "provided with" and "installed" should be understood in a broad sense, for example, it can be fixed connection, detachable connection, or integrated; it can be mechanical connection, direct connection, or indirect connection through an intermediate medium, which can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figures 1 to 15As shown, it is a three-pole leakage protection plug, including a shell 1, a reset button 4, a live wire pin 5, a ground wire pin 6, a neutral wire pin 7, a trip coil assembly 11, a mounting frame 13 and a circuit board 14; the live wire pin 5, the ground wire pin 6 and the neutral wire pin 7 are respectively installed in the shell 1, a live wire static contact 51 is provided at the upper end of the live wire pin 5, a neutral wire static contact 71 is provided at the upper end of the neutral wire pin 7, and a ground wire static contact 61 is provided at the upper end of the ground wire pin 6, and the mounting frame 13 is installed at the upper end of the ground wire pin 6. In the housing 1, the circuit board 14 is arranged on the mounting frame 13, and the reset button 4 passes through the circuit board 14 and can move up and down in the mounting frame 13; it is characterized in that the height of the ground wire pin 6 is lower than the height of the live wire pin 5 and the neutral wire pin 7, and the mounting frame 13 is respectively provided with a first mounting chamber 131 and a second mounting chamber 132, and longitudinal grooves 133 are respectively provided on both sides of the second mounting chamber 132, and the trip coil assembly 11 is arranged in the first mounting chamber 131 and is electrically connected to the circuit board 14; it also includes,

[0033] The live wire moving contact piece structure 8, the ground wire moving contact piece structure 9 and the neutral wire moving contact piece structure 10; the live wire moving contact piece structure 8 includes a live wire mounting position and a live wire transverse spring piece 83, the live wire mounting position is arranged on one side of the mounting frame 13, one end of the live wire mounting position is electrically connected to the circuit board 14, the other end of the live wire mounting position is connected to one end of the live wire transverse spring piece 83 and the live wire transverse spring piece 83 is tilted downward, the other end of the live wire transverse spring piece 83 is provided with a live wire moving contact 84, the live wire moving contact 84 can be electrically connected to the live wire static contact 51 by contact; the neutral wire moving contact piece structure 10 includes a neutral wire mounting position and a neutral wire transverse spring piece 103, the neutral wire mounting position is arranged on the other side of the mounting frame 13, one end of the neutral wire mounting position is electrically connected to the circuit board 14, the other end of the neutral wire mounting position is connected to the neutral wire transverse spring piece The ground wire movable contact piece structure 9 comprises a ground wire mounting position and a ground wire transverse elastic piece 92, wherein the ground wire mounting position is arranged on the mounting frame 13, one end of the ground wire mounting position is connected to the ground wire, and the other end of the ground wire mounting position is connected to one end of the ground wire transverse elastic piece 92 and the ground wire transverse elastic piece 92 is tilted downward, the length of the ground wire transverse elastic piece 92 is greater than the length of the live wire transverse elastic piece 83 and the neutral wire transverse elastic piece 103, and a ground wire movable contact 93 is arranged at the other end of the ground wire transverse elastic piece 92, and the ground wire movable contact 93 can be electrically connected to the ground wire static contact 61 by touching;

[0034] The pressure arm 12; a longitudinal slide groove 123 is provided on one side of the upper part of the pressure arm 12, a raised lock buckle 122 is provided on the other side of the upper part of the pressure arm 12, a bearing arm 121 is provided on the lower part of the pressure arm 12, the pressure arm 12 is arranged in the second installation chamber 132 and can be twisted forward and backward, the bearing arms 121 are respectively located in the corresponding longitudinal grooves 133 and can move up and down, the live line transverse spring piece 83 is borne on the right side of the bearing arm 121, the neutral line transverse spring piece 103 is borne on the left side of the bearing arm 121, and the ground line transverse spring piece 92 is borne on the middle part of the bearing arm 121, the lock buckle 122 cooperates with the reset button 4 hook, and the iron core 112 of the trip coil assembly 11 Inserted in the longitudinal slide groove 123 of the pressure arm 12, the iron core 112 can pull the longitudinal slide groove 123 of the pressure arm 12 to twist backward with the bearing arm 121 as the axis, and the lock buckle 122 on the other side of the pressure arm 12 disengages from the reset button 4, and the ground wire installation position, the live wire installation position and the neutral wire installation position respectively make the ground wire transverse spring piece 92, the live wire transverse spring piece 83 and the neutral wire transverse spring piece 103 tilt downward, thereby pushing the pressure arm 12 to slide downward along the longitudinal groove 133; the neutral wire moving contact 104 and the neutral wire static contact 71 are disengaged and disconnected from each other, the live wire moving contact 84 and the live wire static contact 51 are disengaged and disconnected from each other, and the ground wire moving contact 93 and the ground wire static contact 61 are disengaged and disconnected from each other.

[0035] In this embodiment, when other components of the three-pole leakage protection plug remain unchanged, the function of a common two-pole leakage protection plug can be realized by simply not installing the ground wire movable contact piece structure 9.

[0036] During operation, the lock buckle 122 of the pressing arm 12 cooperates with the hook of the reset button 4 to make the live wire moving contact 84 and the live wire static contact 51 touch and electrically connect, the neutral wire moving contact 104 and the neutral wire static contact 71 touch and electrically connect, and the ground wire moving contact 93 and the ground wire static contact 61 touch and electrically connect; during leakage protection, the iron core 112 of the tripping coil assembly 11 pulls the pressing arm 12 to twist backward so that the lock buckle 122 is disengaged from the reset button 4, and the reset button 4 moves upward, and the live wire horizontal spring piece 83, the ground wire horizontal spring piece 92 and the neutral wire horizontal spring piece 103 tilt downward, thereby driving the bearing arm 121 to move downward in the longitudinal groove 133, and the live wire moving contact 84 and the live wire static contact When resetting, the reset button 4 is pressed, the iron core 112 of the tripping coil assembly 11 pushes the pressure arm 12 to twist forward, and the lock 122 of the pressure arm 12 is re-engaged with the reset button 4, the reset button 4 is released, the reset button 4 moves upward to drive the pressure arm 12 to move upward, and the bearing arm 121 moves upward in the longitudinal groove 133, the live wire moving contact 84 touches and electrically connects with the live wire static contact 51, the ground wire moving contact 93 touches and electrically connects with the ground wire static contact 61, and the neutral wire moving contact 104 touches and electrically connects with the neutral wire static contact 71.

[0037] The pressure arm 12 replaces the ordinary pressure arm and the locking plate, so the locking plate can be omitted in this patent compared to the ordinary tripping mechanism. The manufacturing process of the locking plate is complicated and the processing precision is high, which leads to a high defective rate and unstable products. The use of the pressure arm of this patent not only saves materials and manufacturing costs, but also improves the reliability of the product.

[0038] The live wire transverse spring piece 83 of the three-pole leakage protection plug is borne on the right side of the bearing arm 121, the neutral wire transverse spring piece 103 is borne on the left side of the bearing arm 121, and the ground wire transverse spring piece 92 is borne on the middle part of the bearing arm 121. All force points are on the same axis of the pressure arm, with uniform force and coordinated actions. Therefore, it is more reliable and has more stable performance than the commonly used three-pole leakage protection tripping mechanism, and is easier to assemble and has lower cost.

[0039] In this embodiment, a slide groove 137 is provided beside the second installation chamber 132, and the reset button 4 includes a reset rod 41, a button 42 and a reset spring 43. The reset rod 41 is provided above the circuit board 14 and moves up and down in the slide groove 137. The button 42 is provided at the upper end of the reset rod 41 and extends out of the housing 1. The reset spring 43 is sleeved on the reset rod 41 and is located between the circuit board 14 and the reset button 42. A hook 411 and a guide provided at the lower part of the hook 411 are provided at the lower end of the reset rod 41. Inclined surface 412; the lock buckle 122 of the pressing arm 12 can be locked on the hook 411 of the reset button 4. Under the elastic force of the reset spring 43, the reset button 4 can drive the pressing arm 12, the neutral line horizontal spring piece 103, the ground line horizontal spring piece 92 and the live line horizontal spring piece 83 to move upward, the neutral line moving contact 104 and the neutral line static contact 71 are mutually correspondingly touched and electrically connected, the ground line moving contact 93 and the ground line static contact 61 are mutually correspondingly touched and electrically connected, and the live line moving contact 84 and the live line static contact 51 are mutually correspondingly touched and electrically connected. The guiding inclined surface 412 provided at the lower part of the hook 411 is used to make the reset button smoother when being pressed downward.

[0040] During normal operation, the lock buckle 122 of the pressure arm 12 is buckled on the hook 411 so that the live wire moving contact 84 and the live wire static contact 51 are in contact and electrically connected, the ground wire moving contact 93 and the ground wire static contact 61 are in contact and electrically connected, and the neutral wire moving contact 104 and the neutral wire static contact 71 are in contact and electrically connected; during leakage protection, the iron core 112 of the tripping coil assembly 11 pulls the longitudinal slide groove 123 to twist backward so that the lock buckle 122 is separated from the hook 411, and the reset button 4 moves upward; when resetting, press The reset button 42 is pressed down, and the iron core 112 of the tripping coil assembly 11 pushes the longitudinal slide slot 123 to twist forward, and the lock 122 is buckled on the hook 411. The reset button 42 is released, and the reset rod 41 moves upward and drives the bearing arm 121 to move upward in the longitudinal slot 133. The live wire moving contact 84 and the live wire static contact 51, the ground wire moving contact 93 and the ground wire static contact 61 are in touch electrical connection and in touch electrical connection, and the neutral wire moving contact 104 and the neutral wire static contact 71 are in touch electrical connection.

[0041] In this embodiment, the tripping coil assembly 11 also includes a coil 111 and a spring 113; the coil 111 is arranged in the first installation chamber 131 and is electrically connected to the circuit board 14, the spring 113 and the iron core 112 are respectively located in the coil 111, the spring 113 is located at the rear of the iron core 112, the iron core 112 can move forward and backward in the coil 111, and an annular groove 114 is provided at the protruding end of the iron core 112, and the annular groove 114 is clamped on the longitudinal slide groove 123, so that the longitudinal slide groove 123 of the pressure arm 12 can slide up and down along the annular groove 114.

[0042] During normal operation, the coil 111 has no induction, and the spring 113 pushes the iron core 112 to extend; when a leakage fault occurs, the tripping current of the coil 111 generates a strong magnetic force to drive the iron core 112 to extend, and the iron core 112 pulls the pressure arm 12 to twist backward while the longitudinal slide groove 113 slides downward along the annular groove 114; when resetting, the reset button 4 is pressed, the spring 113 pushes the iron core 112 to extend, and the iron core 112 pushes the pressure arm 12 to twist forward, and the lock 122 of the pressure arm 12 is re-engaged with the reset button 4, the reset button 4 is released, the reset button 4 moves upward, and the longitudinal slide groove 123 of the pressure arm 12 slides upward along the annular groove 114.

[0043] When working, the reset button 4 is pressed, the reset spring 43 contracts downward, and the reset rod 41 moves downward along the slide groove 137 of the mounting frame. When the hook 411 at the lower part of the reset rod 41 exceeds the lock buckle 122 on one side of the upper part of the pressure arm 12, the iron core 112 of the tripping coil assembly 11 is under the elastic force of the spring 113, and the annular slide groove 114 inserted in the head of the iron core 112 pushes the longitudinal slide groove 123 on the other side of the upper part of the pressure arm 12 to twist forward, and the lock buckle 122 slides into the hook 411, locking the reset button 4 and the pressure arm 12 into one. Release the reset button 4, and under the elastic force of the reset spring 43, the reset rod 41 moves along the slide groove 137 of the mounting frame to The bearing arm 121 of the pressure arm 12 supports the live wire transverse spring piece 83, the neutral wire transverse spring piece 103 and the ground wire transverse spring piece 92 to move upward together along the longitudinal groove 133 of the mounting frame 13, and the longitudinal slide groove 123 on one side of the upper part of the pressure arm 12 slides upward synchronously in the annular slide groove 114 at the head of the iron core 112 until the live wire moving contact 84, the neutral wire moving contact 104 and the ground wire moving contact 93 at the other end of the live wire transverse spring piece 83, the neutral wire transverse spring piece 103 and the ground wire transverse spring piece 92 touch the live wire static contact 51, the neutral wire static contact 71 and the ground wire static contact 61 respectively, and the three poles are connected to the power supply and start working; because the ground wire pin is The heights are lower than those of the live wire pin and the neutral wire pin, respectively, so the ground wire moving contact 93 is connected to the ground wire static contact 61 earlier than the neutral wire moving contact 103 and the neutral wire static contact 71 and the live wire moving contact 83 and the live wire static contact 51; when a leakage fault occurs, the leakage protection circuit immediately outputs a strong tripping current to the tripping coil 111, and the iron core 112 of the tripping coil assembly 11 generates a strong magnetic field through electromagnetic induction, pulling the longitudinal groove 123 on the pressure arm 12 inserted in the annular groove 114 at the head of the iron core 112 to twist backward, and the lock buckle 122 slides out of the hook 411 of the reset button, and the reset button 4 moves upward by the elastic force of the reset spring 43. The neutral line horizontal spring piece 103, the live line horizontal spring piece 83 and the ground line horizontal spring piece 92 drive the pressure arm 12 to move downward along the longitudinal slide groove 133 of the mounting frame 13, and the longitudinal slide groove 123 on the upper side of the pressure arm 12 slides downward synchronously in the annular slide groove 114 at the head of the iron core 112, and the neutral line moving contact 104 and the neutral line static contact 71, the live line moving contact 84 and the live line static contact 51, and the ground line moving contact 93 and the ground line static contact 61 are separated from each other to cut off the power supply. Because the height of the ground line pin is lower than the height of the live line pin and the neutral line pin, the ground line moving contact 93 and the ground line static contact 61 are separated and disconnected later than the other neutral and live poles.

[0044] In this embodiment, the live wire installation position includes a live wire longitudinal plug-in 81 and a live wire bending piece 82, one end of the live wire longitudinal plug-in 81 is electrically connected to the circuit board 14, the other end of the live wire longitudinal plug-in 81 is connected to one end of the live wire bending piece 82, the other end of the live wire bending piece 82 is connected to one end of the live wire transverse spring piece 83 and the live wire transverse spring piece 83 is tilted downward; the neutral wire installation position includes a neutral wire longitudinal plug-in 101 and a neutral wire bending piece 102, one end of the neutral wire longitudinal plug-in 101 is electrically connected to the circuit board 14, the other end of the neutral wire longitudinal plug-in 101 is connected to one end of the neutral wire bending piece 102, the other end of the neutral wire bending piece 102 is connected to the neutral wire transverse spring piece 1 03 and make the neutral line horizontal spring piece 103 tilt downward; on both sides of the mounting frame 13, there are respectively provided with a longitudinal piece plug-in position 134 and a bent piece mounting column 135; the live line longitudinal plug-in piece 81 and the neutral line longitudinal plug-in piece 101 are respectively plugged into the corresponding longitudinal piece plug-in position 134, and the live line bent piece 82 and the neutral line bent piece 102 are respectively sleeved on the corresponding bent piece mounting column 135; the ground line mounting position includes a ground line bent piece 91, and the ground line bent piece 91 is arranged on the mounting frame 13, one end of the ground line bent piece 91 is electrically connected to the ground line, and the other end of the ground line bent piece 91 is connected to the ground line horizontal spring piece 92 and makes the ground line horizontal spring piece 92 tilt downward. The live line bent piece 82 and the neutral line spring piece 102 are respectively sleeved on the corresponding bent piece mounting column 135 to better position the live line moving contact piece structure 8 and the neutral line moving contact piece structure 10.

[0045] In this embodiment, an opening 124 is further provided on the pressure arm 12. The opening 124 is located above the middle of the bearing arm 121. The ground wire transverse spring piece 92 is located in the opening 124 and is supported on the middle of the bearing arm.

[0046] In this embodiment, a live wire pin plugging position 1A, a ground wire pin plugging position 1B and a neutral wire pin plugging position 1C are respectively provided in the housing 1, the live wire pin 5 is plugged into the live wire pin plugging position 1A, the ground wire pin 6 is plugged into the ground wire pin plugging position 1B, and the neutral wire pin 7 is plugged into the neutral wire pin plugging position 1C.

[0047] In this embodiment, a test button 3 and a light-transmitting cover 2 are further provided on the circuit board 14 ; the tops of the test button 3 and the light-transmitting cover extend out of the housing 1 .

[0048] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and deformations of these embodiments without departing from the principles and purposes of the present invention still fall within the scope of protection of the present invention.

Claims

1. A three-pole leakage protection plug, comprising a housing (1), a reset button (4), a live wire pin (5), a ground wire pin (6), a neutral wire pin (7), a trip coil assembly (11), a mounting frame (13) and a circuit board (14); the live wire pin (5), the ground wire pin (6) and the neutral wire pin (7) are respectively mounted in the housing (1); a live wire static contact (51) is provided at the upper end of the live wire pin (5); a neutral wire static contact (71) is provided at the upper end of the neutral wire pin (7); and a ground wire static contact (61) is provided at the upper end of the ground wire pin (6); the mounting frame (13) is mounted in the housing (1); the circuit board (14) is arranged on the mounting frame (13); the reset button (4) passes through the circuit board (14) and can move up and down in the mounting frame (13); characterized in that The height of the ground wire pin (6) is lower than the height of the live wire pin (5) and the neutral wire pin (7); the mounting frame (13) is provided with a first mounting chamber (131) and a second mounting chamber (132), longitudinal grooves (133) are provided on both sides of the second mounting chamber (132); the trip coil assembly (11) is arranged in the first mounting chamber (131) and is electrically connected to the circuit board (14); and further includes: A live wire moving contact piece structure (8), an earth wire moving contact piece structure (9) and a neutral wire moving contact piece structure (10); the live wire moving contact piece structure (8) comprises a live wire mounting position and a live wire transverse spring piece (83); the live wire mounting position is arranged on one side of a mounting frame (13); one end of the live wire mounting position is electrically connected to a circuit board (14); the other end of the live wire mounting position is connected to one end of the live wire transverse spring piece (83) and the live wire transverse spring piece (83) is tilted downward; the other end of the live wire transverse spring piece (83) is provided with a live wire moving contact (84); the live wire moving contact (84) can be electrically connected to a live wire static contact (51) by contact; the neutral wire moving contact piece structure (10) comprises a neutral wire mounting position and a neutral wire transverse spring piece (103); the neutral wire mounting position is arranged on the other side of the mounting frame (13); one end of the neutral wire mounting position is electrically connected to the circuit board (14); the other end of the neutral wire mounting position is connected to the neutral wire transverse spring piece The ground wire movable contact piece structure (9) comprises a ground wire mounting position and a ground wire transverse elastic piece (92). The ground wire mounting position is arranged on a mounting frame (13). One end of the ground wire mounting position is connected to the ground wire. The other end of the ground wire mounting position is connected to one end of the ground wire transverse elastic piece (92) and causes the neutral wire transverse elastic piece (103) to tilt downward. A neutral wire movable contact (104) is arranged at the other end of the neutral wire transverse elastic piece (103). The neutral wire movable contact (104) can be electrically connected to the neutral wire static contact (71) by contact. The ground wire movable contact piece structure (9) comprises a ground wire mounting position and a ground wire transverse elastic piece (92). The ground wire mounting position is arranged on a mounting frame (13). One end of the ground wire mounting position is connected to the ground wire. The other end of the ground wire mounting position is connected to one end of the ground wire transverse elastic piece (92) and causes the ground wire transverse elastic piece (92) to tilt downward. The length of the ground wire transverse elastic piece (92) is greater than the length of the live wire transverse elastic piece (83) and the neutral wire transverse elastic piece (103). A ground wire movable contact (93) is arranged at the other end of the ground wire transverse elastic piece (92). The ground wire movable contact (93) can be electrically connected to the ground wire static contact (61) by contact. A pressure arm (12); a longitudinal slide groove (123) is provided on one side of the upper part of the pressure arm (12); a protruding lock buckle (122) is provided on the other side of the upper part of the pressure arm (12); a bearing arm (121) is provided on the lower part of the pressure arm (12); the pressure arm (12) is arranged in the second installation chamber (132) and can be twisted forward and backward; the bearing arms (121) are respectively located in the corresponding longitudinal grooves (133) and can move up and down; the live line transverse spring piece (83) is borne on the right side of the bearing arm (121); the neutral line transverse spring piece (103) is borne on the left side of the bearing arm (121); the ground line transverse spring piece (92) is borne on the middle part of the bearing arm (121); the lock buckle (122) cooperates with the reset button (4) hook, and the iron core (112) of the release coil assembly (11) ) is inserted into the longitudinal slide groove (123) of the pressure arm (12), the iron core (112) can pull the longitudinal slide groove (123) of the pressure arm (12) to twist backward with the bearing arm (121) as the axis, the lock (122) on the other side of the pressure arm (12) is disengaged from the reset button (4), the ground wire installation position, the live wire installation position and the neutral wire installation position respectively cause the ground wire transverse spring piece (92), the live wire transverse spring piece (83) and the neutral wire transverse spring piece (103) to tilt downward, thereby pushing the pressure arm (12) to slide downward along the longitudinal groove (133); the neutral wire moving contact (104) and the neutral wire static contact (71) are separated from each other, the live wire moving contact (84) and the live wire static contact (51) are separated from each other, and the ground wire moving contact (93) and the ground wire static contact (61) are separated from each other.

2. The three-pole leakage protection plug according to claim 1 is characterized in that A slide groove (137) is provided next to the second installation chamber (132). The reset button (4) comprises a reset rod (41), a button (42) and a reset spring (43). The reset rod (41) is provided above the circuit board (14) and is located in the slide groove (137) and moves up and down. The button (42) is provided at the upper end of the reset rod (41) and extends out of the housing (1). The reset spring (43) is sleeved on the reset rod (41) and is located between the circuit board (14) and the reset button (42). A hook (411) and a guide spring (43) provided at the lower end of the reset rod (41) are provided. The locking buckle (122) of the pressing arm (12) can be locked on the hook (411) of the reset button (4); the reset button (4) can drive the pressing arm (12), the neutral line transverse spring piece (103), the ground line transverse spring piece (92) and the live line transverse spring piece (83) to move upward under the elastic force of the reset spring (43); the neutral line moving contact (104) and the neutral line static contact (71) are mutually contacted and electrically connected; the ground line moving contact (93) and the ground line static contact (61) are mutually contacted and electrically connected; and the live line moving contact (84) and the live line static contact (51) are mutually contacted and electrically connected.

3. The three-pole leakage protection plug according to claim 1 is characterized in that The trip coil assembly (11) further comprises a coil (111) and a spring (113); the coil (111) is arranged in the first installation chamber (131) and is electrically connected to the circuit board (14); the spring (113) and the iron core (112) are respectively arranged in the coil (111); the spring (113) is arranged at the rear of the iron core (112); the iron core (112) can move forward and backward in the coil (111); an annular groove (114) is arranged at the protruding end of the iron core (112); the annular groove (114) is clamped on the longitudinal slide groove (123), so that the longitudinal slide groove (123) of the pressing arm (12) can slide up and down along the annular groove (114).

4. The three-pole leakage protection plug according to claim 1, characterized in that The live wire installation position comprises a live wire longitudinal plug-in piece (81) and a live wire bending piece (82); one end of the live wire longitudinal plug-in piece (81) is electrically connected to the circuit board (14); the other end of the live wire longitudinal plug-in piece (81) is connected to one end of the live wire bending piece (82); the other end of the live wire bending piece (82) is connected to one end of the live wire transverse spring piece (83) and the live wire transverse spring piece (83) is tilted downward; the neutral wire installation position comprises a neutral wire longitudinal plug-in piece (101) and a neutral wire bending piece (102); one end of the neutral wire longitudinal plug-in piece (101) is electrically connected to the circuit board (14); the other end of the neutral wire longitudinal plug-in piece (101) is connected to one end of the neutral wire bending piece (102); the other end of the neutral wire bending piece (102) is connected to the neutral wire transverse spring piece (103); One end is connected and the neutral line transverse spring piece (103) is tilted downward; a longitudinal piece plug-in position (134) and a bent piece mounting column (135) are respectively provided on both sides of the mounting frame (13); the live line longitudinal plug-in piece (81) and the neutral line longitudinal plug-in piece (101) are respectively plugged into the corresponding longitudinal piece plug-in position (134), and the live line bent piece (82) and the neutral line bent piece (102) are respectively sleeved on the corresponding bent piece mounting column (135); the ground line mounting position comprises a ground line bent piece (91), the ground line bent piece (91) is arranged on the mounting frame (13), one end of the ground line bent piece (91) is electrically connected to the ground line, and the other end of the ground line bent piece (91) is connected to the ground line transverse spring piece (92) and the ground line transverse spring piece (92) is tilted downward.

5. The three-pole leakage protection plug according to claim 1, characterized in that An opening (124) is also provided on the pressure arm (12), and the opening (124) is located above the middle of the bearing arm (121). The ground wire transverse spring piece (92) is located in the opening (124) and is supported on the bearing arm in the middle.

6. The three-pole leakage protection plug according to claim 1, characterized in that A live wire pin plugging position (1A), a ground wire pin plugging position (1B) and a neutral wire pin plugging position (1C) are respectively provided in the housing (1); the live wire pin (5) is plugged into the live wire pin plugging position (1A), the ground wire pin (6) is plugged into the ground wire pin plugging position (1B), and the neutral wire pin (7) is plugged into the neutral wire pin plugging position (1C).

7. The three-pole leakage protection plug according to claim 1, characterized in that A test button (3) and a light-transmitting cover (2) are also provided on the circuit board (14); the tops of the test button (3) and the light-transmitting cover extend out of the housing (1).

Images