Leakage protection socket

Abstract

The utility model discloses a leakage protection socket, which comprises a shell and a control circuit board, the control circuit board is provided with a pair of elastic power supply live wire, a zero line input metal sheet, a zero sequence current transformer and a tripping device for controlling the elastic power supply live wire and the zero line input metal sheet to be contacted or disconnected with the power supply live wire, the zero line output conductor, the power supply live wire and the zero line output metal sheet; the tripping device comprises a carrier support, a movable iron core, a locking plate and a tripping coil located outside the movable iron core, the carrier support is directly or indirectly provided with a first movable hole and a second movable hole for the test push rod and the reset push rod to vertically move, and the tripping device further comprises a horizontal installation hole perpendicular to the second movable hole. The movable iron core is installed in the horizontal installation hole, the inner end, facing the horizontal installation hole, of the movable iron core is provided with a spring, the outer end of the movable iron core is movably provided with a locking plate, the built-in carrier support provides installation positions for all parts, transmission is more stable, and installation is convenient and fast.

Description

Technical Field

[0001] The utility model relates to the technical field of sockets, in particular to a leakage protection socket. Background Art

[0002] With the continuous development of the GFCI industry, people have higher and higher requirements for the safety of GFCI sockets. It is hoped that when the life of the GFCI socket ends, that is, when its internal components fail and lose the leakage protection function, the user can be reminded in time to replace it with a new product.

[0003] Chinese patent number CN200610140506.8 discloses a leakage protection socket with automatic end-of-life detection and display of detection results, characterized in that: four moving contacts are arranged on the power input metal sheet, and four static contacts are also arranged on the power output conductor and the power output metal sheet, and the above four pairs of moving and static contacts constitute four pairs of parallel power switches; the leakage protection socket is also provided with a tripping device that can make the above four pairs of moving and static contacts contact / or disconnect; the tripping device includes a release, a lock, a lock spring, a release top sheet, a tripping rocker, a reset pull rod, a rocker spring and a release coil; the release is located below the reset button on the upper cover, in the middle of the elastic power live wire and neutral wire input metal sheet, it is a column, fixed on a coil frame and can move up and down along the coil frame in a straight line, and a longitudinal central through hole is provided on its top, and a reset guide column with a reset spring embedded in the bottom surface of the reset button can move up and down along the central through hole.

[0004] Problems existing in the above patent: The existing tripping device realizes tripping based on a complex linkage structure. The installation of each component is cumbersome, which affects the assembly efficiency. In addition, there is no carrier bracket inside, and the linkage is only formed by connecting the components, and the overall stability is poor. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a leakage protection socket.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a leakage protection socket, comprising a shell and a control circuit board installed in the shell, the shell comprising an upper cover, a base and an insulating middle-layer bracket located between the upper cover and the base, the shell is movably provided with a test button, a test push rod, a reset button and a reset push rod, the upper cover is provided with a power output socket hole, a pair of power input terminals and a pair of power output terminals are provided on both sides of the base; a pair of power live wire and neutral wire output metal sheets connected to the power output terminals are provided on both sides of the base, and power live wire and neutral wire output conductors are provided on both sides of the insulating middle-layer bracket, a pair of elastic power live wire and neutral wire input metal sheets, a zero-sequence current transformer for detecting leakage current and a control circuit board for controlling the elastic power live wire and neutral wire output are installed on the control circuit board. A tripping device is provided in which a metal sheet is in contact with or disconnected from the live wire and neutral wire output conductors of the power supply, and the live wire and neutral wire output metal sheet of the power supply; the tripping device includes a carrier bracket, a movable iron core, a locking plate and a tripping coil located outside the movable iron core, the carrier bracket is directly or indirectly provided with a first movable hole and a second movable hole for vertical movement of a test push rod and a reset push rod, and also includes a horizontal mounting hole arranged perpendicular to the second movable hole, the movable iron core is installed in the horizontal mounting hole, a spring is arranged at the inner end of the movable iron core facing the horizontal mounting hole, a locking plate is movably arranged at the outer end of the movable iron core, a limiting hole is arranged on the locking plate, a limiting portion is arranged on the reset push rod at the position of the limiting hole, and the locking plate has a first state corresponding to the limiting hole and the limiting portion and a second state in which the limiting hole and the limiting portion are misaligned when the tripping coil is energized or de-energized.

[0007] As a preferred technical solution of the utility model, a mounting seat is arranged in the carrier bracket, a second movable hole is arranged on the mounting seat, a sliding groove for sliding the locking plate is arranged through the side wall of the mounting seat, the sliding groove is connected with the second movable hole, the locking plate slides and is limited in the sliding groove, and the limiting portion and the second movable hole are coaxially arranged.

[0008] As a preferred technical solution of the utility model, the locking piece includes an abutment portion, a slide portion and a mounting portion, the mounting portion is provided with a locking groove linked to the movable iron core, and the abutment portion and the mounting portion correspond to the test push rod and the movable iron core respectively.

[0009] As a preferred technical solution of the utility model, the mounting portion includes two extension plates symmetrically arranged on both sides of the slide plate portion, the two extension plates extend downward and form a gap between them, and the locking plate can move vertically relative to the movable iron core and can move horizontally with the movable iron core.

[0010] As a preferred technical solution of the utility model, an insertion part is provided at the outer end of the movable iron core, and the insertion part includes an insertion rod and a baffle, and the two ends of the insertion rod are respectively connected to the movable iron core and the baffle, and an opening for the baffle to enter is provided at a position corresponding to the notch on the slide plate, and the opening and the notch constitute a locking groove, and the diameter of the insertion rod is smaller than the diameter of the baffle.

[0011] As a preferred technical solution of the utility model, the abutting portion is arc-shaped and is formed by bending one end of the slide plate downward.

[0012] As a preferred technical solution of the utility model, a through hole is provided on the insulating middle layer bracket, a first reset spring located between the through hole and the reset button is sleeved on the reset push rod, and a second reset spring located at the lower end of the test push rod is provided in the first movable hole.

[0013] As a preferred technical solution of the utility model, one end of the elastic power live wire and neutral wire input metal sheet is bent downward by 90 degrees, passes through the zero-sequence current transformer and is welded to the control circuit board together with the power input terminal; the other ends of a pair of elastic power live wire and neutral wire input metal sheets are respectively divided into two moving contact arms horizontally, and a moving contact is respectively provided in parallel on the top surface of each end of the moving contact arm, and two pairs of four moving contacts are provided in parallel at the ends of the four moving contact arms; a pair of static contacts are respectively provided at the upper and lower vertical corresponding positions of a pair of moving contacts on the moving contact arms of the elastic power live wire and neutral wire input metal sheets on a pair of power live wire and neutral wire output conductors; a pair of static contacts are also respectively provided at the upper and lower vertical corresponding positions of another pair of moving contacts on the moving contact arms of the elastic power live wire and neutral wire input metal sheets on a pair of power live wire and neutral wire output metal sheets; the above two pairs of moving contacts and two pairs of static contacts constitute two groups of four pairs of switches for live wires and neutral wires arranged in parallel.

[0014] To sum up, the beneficial effects of the utility model are as follows: by arranging a carrier bracket in the shell, installation positions for various components can be provided, the transmission is more stable, the installation is convenient, and the structure of the tripping device is optimized. When leakage occurs in the power supply circuit, the zero-sequence current transformer outputs a voltage signal, and through a switching device (this is the prior art and will not be elaborated in detail) such as a thyristor, current flows through the tripping coil with a built-in movable iron core, generating a magnetic field, causing the iron core to move, and then driving the relative position of the locking plate and the reset push rod to activate the tripping device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a cross-sectional view of the utility model;

[0017] Figure 3It is a schematic diagram of the structure of the utility model without the shell;

[0018] Figure 4 It is a schematic diagram of the internal structure of the lower shell part of the utility model;

[0019] Figure 5 It is a schematic diagram of the internal structure of the lower shell part of the utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the mounting base and the working switch of the utility model;

[0021] Figure 7 It is a structural schematic diagram of the utility model trip device without the carrier bracket;

[0022] Figure 8 It is a schematic diagram of the structure of the movable iron core, the locking piece and the reset push rod of the utility model;

[0023] Fig. 9 It is a structural schematic diagram of the movable iron core and the locking piece of the utility model. DETAILED DESCRIPTION

[0024] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0025] The specific embodiments of the present utility model are described below in conjunction with the accompanying drawings.

[0026] like Figures 1 to 9 A leakage protection socket shown in the figure comprises a shell 1 and a control circuit board 2 installed in the shell 1, the shell 1 comprises an upper cover 3, a base 4 and an insulating middle-layer bracket 5 located between the upper cover 3 and the base 4, a test button 6, a test push rod 7, a reset button 8 and a reset push rod 9 are movably arranged on the shell 1, the upper cover 3 is provided with a power output socket hole 10, a pair of power input terminals 11 and a pair of power output terminals 12 are arranged on both sides of the base 4; a pair of power live wire and neutral wire output metal sheets 13 connected to the power output terminals 12 are arranged on both sides of the base 4, a power live wire and neutral wire output conductor 14 are respectively arranged on both sides of the insulating middle-layer bracket 5, and the power live wire and neutral wire output conductor 14 are provided with sheet-shaped clip leaf wings, a pair of elastic power live wire and neutral wire input metal sheets 15, a zero-sequence current transformer 16 for detecting leakage current and a trip device 17 for controlling the elastic power live wire and neutral wire input metal sheets 15 to contact or disconnect with the power live wire and neutral wire output conductor 14 and the power live wire and neutral wire output metal sheets 13 are installed on the control circuit board 2.

[0027] The tripping device 17 includes a carrier bracket 18, a movable iron core 19, a locking plate 20 and a tripping coil 21 located outside the movable iron core 19. The carrier bracket 18 is directly or indirectly provided with a first movable hole 22 and a second movable hole 23 for vertical movement of the test push rod 7 and the reset push rod 9, and also includes a horizontal mounting hole 24 arranged perpendicular to the second movable hole 23. The movable iron core 19 is installed in the horizontal mounting hole 24. A spring is arranged at the inner end of the movable iron core 19 facing the horizontal mounting hole 24. A locking plate 20 is movably arranged at the outer end of the movable iron core 19. A limiting hole 26 is provided on the locking plate 20, and a limiting portion 27 is arranged on the reset push rod 9 at a position corresponding to the limiting hole 26. When the tripping coil 21 is energized or de-energized, the locking plate 20 has a first state corresponding to the limiting hole 26 and the limiting portion 27 and a second state in which the limiting hole 26 and the limiting portion 27 are misaligned.

[0028] By arranging a carrier bracket 18 in the shell 1, installation positions for various components can be provided, the transmission is more stable, the installation is convenient, and the structure of the tripping device 17 is optimized. When leakage occurs in the power supply circuit, the zero-sequence current transformer 16 outputs a voltage signal, and through a switching device (this is the prior art and will not be elaborated in detail) such as a thyristor, a current flows through the tripping coil 21 with a built-in movable iron core 19, generating a magnetic field, causing the iron core to move, and then driving the locking plate 20 to a relative position with the reset push rod 9, so that the tripping device 17 is activated.

[0029] A mounting seat 28 is provided in the carrier bracket 18, and a second movable hole 23 is provided on the mounting seat 28. A sliding groove 29 for the locking piece 20 to slide is provided through the side wall of the mounting seat 28. The sliding groove 29 is connected to the second movable hole 23. The locking piece 20 slides and is limited in the sliding groove 29. The limiting portion 27 and the second movable hole 23 are coaxially arranged.

[0030] The locking piece 20 includes an abutting portion 30 , a sliding plate portion 31 and a mounting portion 32 . The mounting portion 32 is provided with a locking groove 33 linked to the movable iron core 19 . The abutting portion 30 and the mounting portion 32 correspond to the test push rod 7 and the movable iron core 19 respectively.

[0031] The mounting portion 32 includes two extension plates 34 symmetrically arranged on both sides of the slide plate portion 31 . The two extension plates 34 extend downward and form a gap 35 therebetween. The locking piece 20 can move vertically relative to the movable iron core 19 and can move horizontally with the movable iron core 19 .

[0032] An insertion portion 36 is provided at the outer end of the movable iron core 19, and the insertion portion 36 includes an insertion rod 37 and a baffle 38. The two ends of the insertion rod 37 are respectively connected to the movable iron core 19 and the baffle 38. An opening 39 for the baffle 38 to enter is provided at a position corresponding to the notch 35 on the slide plate portion 31. The opening 39 and the notch 35 constitute a locking groove 33. The diameter of the insertion rod 37 is smaller than the diameter of the baffle 38.

[0033] The abutting portion 30 is arc-shaped and is formed by bending one end of the sliding plate portion 31 downward.

[0034] A through hole 40 is provided on the insulating middle layer bracket 5 , and a first reset spring 41 is sleeved on the reset push rod 9 and is located between the through hole 40 and the reset button 8 . A second reset spring 42 located at the lower end of the test push rod 7 is provided in the first movable hole 22 .

[0035] One end of the elastic power live wire and neutral wire input metal sheet 15 is bent downward by 90 degrees, passes through the zero-sequence current transformer 16 and is welded to the control circuit board 2 together with the power input terminal 11; the other ends of a pair of elastic power live wire and neutral wire input metal sheets 15 are respectively divided into two movable contact arms 43 (fixed on the mounting seat 28) in a horizontal direction, and a movable contact point 44 is respectively arranged in parallel on the top surface of the end of each movable contact arm 43, and two pairs of four movable contacts 44 are arranged in parallel at the ends of the four movable contact arms 43; a pair of power live wire and neutral wire output conductors 14 are connected to the said A pair of static contacts 25 are respectively provided at the upper and lower vertical corresponding positions of a pair of moving contacts 44 on the moving contact arm 43 of the elastic power supply live wire and neutral wire input metal sheet 15; a pair of static contacts 25 are also respectively provided at the upper and lower vertical corresponding positions of another pair of moving contacts 44 on the moving contact arm 43 of the elastic power supply live wire and neutral wire input metal sheet 15 on a pair of power supply live wire and neutral wire output metal sheets 13; the above two pairs of moving contacts 44 and two pairs of static contacts 25 constitute two groups of four pairs of switches for live wires and neutral wires arranged in parallel. This is the prior art, and the comparative documents in the background technology can be referred to.

[0036] Working principle: When leakage occurs in the power supply circuit, the zero-sequence current transformer 16 outputs a voltage signal, which causes current to flow through the tripping coil 21 with a built-in movable iron core 19 through a switching device such as a thyristor, generating a magnetic field, causing the iron core to move, thereby achieving a tripping action, disconnecting the moving contact 44 on the elastic power live and neutral input metal sheet 15 from the static contact 25 on the power live and neutral output conductor 14 and the static contact 25 on the power live and neutral output metal sheet 13, thereby cutting off the power output of the leakage protection socket.

[0037] The utility model provides a working condition switch 45 made of elastic material between the mounting base 28 (the mounting base 28 is movably mounted in the carrier bracket 18) and the control circuit board 2 (one end of the working condition switch 45 is electrically connected to the circuit board, and the other end is a movable end). When the reset button 8 is pressed, the movable end of the working condition switch 45 is connected to the control circuit board 2, and the neutral and live wires are short-circuited to simulate leakage. When not short-circuited (the movable end of the working condition switch 45 is separated from the control circuit board 2), the currents flowing through the zero-sequence current transformer 16 are equal in magnitude and opposite in phase, the magnetic fields cancel each other out, and the zero-sequence current transformer has no induced voltage.

[0038] The mechanical principle of the leakage protection socket with / without power output of the utility model is: when the leakage protection socket is in the initial state, no current flows in the tripping coil 21, and its built-in iron core does not move, and the limiting part 27 of the reset push rod 9 in the tripping device 17 is located above the limiting hole 26. At this time, the limiting hole 26 and the limiting part 27 are relatively misaligned, and the moving contact 44 on the elastic power live wire and neutral wire input metal sheet 15 is not in contact with the static contact 25 on the power live wire and neutral wire output conductor 14 and the static contact 25 on the power live wire and neutral wire output metal sheet 13, and the leakage protection socket has no power output.

[0039] Press the reset button 8 downward, and the reset push rod 9 drives the mounting seat 28 to move downward. At this time, the working condition switch 45 is triggered to simulate leakage, so that current flows through the tripping coil 21 with the built-in movable iron core 19, generating a magnetic field, so that the iron core moves into the horizontal mounting hole 24. At this time, the limiting part 27 on the reset push rod 9 and the limiting hole 26 on the locking plate 20 correspond to each other, and the limiting part 27 moves to the bottom of the limiting hole 26. After releasing the reset button 8, the limiting part 27 is misaligned with the limiting hole 26. Under the action of the first reset spring 41, the mounting seat 28 moves upward and drives the two moving contacts. The arm 43 moves upward, so that the moving contact 44 on the elastic power live wire and neutral wire input metal sheet 15 contacts the static contact 25 on the power live wire and neutral wire output conductor 14 and the static contact 25 on the power live wire and neutral wire output metal sheet 13. The test button is pressed to cut off the power to the leakage protection socket and no power is output (the principle is the same as above). The mounting seat 28 is reset, and the moving contact 44 on the elastic power live wire and neutral wire input metal sheet 15 does not contact the static contact 25 on the power live wire and neutral wire output conductor 14 and the static contact 25 on the power live wire and neutral wire output metal sheet 13.

[0040] When the leakage protection socket of the utility model works normally, the four groups of silver dots are connected, the terminal and the outlet have output voltage, and the indicator light is green; the product self-checks when powered on, and if the self-check fails, the product will trip and the indicator light is red, indicating that the product needs to be processed; if the leakage protection socket is damaged during operation, such as the tripping coil 21 is short-circuited (burned out during operation), the indicator light is red.

[0041] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only preferred examples of the utility model, and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected, and the scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A leakage protection socket, comprising a housing (1) and a control circuit board (2) installed in the housing (1), the housing (1) comprising an upper cover (3), a base (4) and an insulating middle-layer support (5) located between the upper cover (3) and the base (4), the housing (1) being movably provided with a test button (6), a test push rod (7), a reset button (8) and a reset push rod (9), the upper cover (3) being provided with a power output socket hole (10), the base (4) being provided with a pair of power input terminals (11) and a pair of power output terminals (12) on both sides; the base (4) being provided with a pair of power input terminals (11) and a pair of power output terminals (12) on both sides A pair of power live and neutral output metal sheets (13) connected to the power output terminal (12) are provided, and power live and neutral output conductors (14) are provided on both sides of the insulating middle bracket (5), respectively. A pair of elastic power live and neutral input metal sheets (15), a zero-sequence current transformer (16) for detecting leakage current, and a trip device (17) for controlling the elastic power live and neutral input metal sheets (15) to contact or disconnect with the power live and neutral output conductors (14) and the power live and neutral output metal sheets (13) are installed on the control circuit board (2); the characteristics are: The trip device (17) comprises a carrier support (18), a movable iron core (19), a locking plate (20) and a tripping coil (21) located outside the movable iron core (19); the carrier support (18) is directly or indirectly provided with a first movable hole (22) and a second movable hole (23) for vertical movement of a test push rod (7) and a reset push rod (9); and further comprises a horizontal mounting hole (24) arranged perpendicular to the second movable hole (23); the movable iron core (19) is mounted in the horizontal mounting hole (24); A spring is arranged at the inner end of the movable iron core (19) facing the horizontal mounting hole (24); a locking plate (20) is movably arranged at the outer end of the movable iron core (19); a limiting hole (26) is provided on the locking plate (20); a limiting portion (27) is arranged on the reset push rod (9) at a position corresponding to the limiting hole (26); and the locking plate (20) has a first state in which the limiting hole (26) corresponds to the limiting portion (27) and a second state in which the limiting hole (26) and the limiting portion (27) are misaligned when the tripping coil (21) is energized or de-energized.

2. The leakage protection socket according to claim 1, characterized in that: A mounting seat (28) is arranged inside the carrier bracket (18), a second movable hole (23) is arranged on the mounting seat (28), a sliding groove (29) for the locking plate (20) to slide is arranged through the side wall of the mounting seat (28), the sliding groove (29) is communicated with the second movable hole (23), the locking plate (20) slides and is limited in the sliding groove (29), and the limiting portion (27) and the second movable hole (23) are coaxially arranged.

3. The leakage protection socket according to claim 1 or 2, characterized in that: The locking piece (20) comprises an abutting portion (30), a sliding plate portion (31) and a mounting portion (32); the mounting portion (32) is provided with a locking groove (33) linked to the movable iron core (19); the abutting portion (30) and the mounting portion (32) correspond to the test push rod (7) and the movable iron core (19) respectively.

4. The leakage protection socket according to claim 3, characterized in that: The mounting portion (32) comprises two extension plates (34) symmetrically arranged on both sides of the slide plate portion (31), the two extension plates (34) extending downward and forming a notch (35) therebetween, and the locking plate (20) can move vertically relative to the movable iron core (19) and can move horizontally with the movable iron core (19).

5. The leakage protection socket according to claim 4, characterized in that: The outer end of the movable iron core (19) is provided with an insertion portion (36), the insertion portion (36) comprising an insertion rod (37) and a baffle (38), the two ends of the insertion rod (37) are respectively connected to the movable iron core (19) and the baffle (38), an opening (39) for the baffle (38) to enter is provided on the slide plate (31) at a position corresponding to the notch (35), the opening (39) and the notch (35) constitute a locking groove (33), and the diameter of the insertion rod (37) is smaller than the diameter of the baffle (38).

6. The leakage protection socket according to claim 3, characterized in that: The abutment portion (30) is arc-shaped and is formed by bending one end of the slide plate portion (31) downward.

7. The leakage protection socket according to claim 1, characterized in that: The insulating middle layer support (5) is provided with a through hole (40), the reset push rod (9) is sleeved with a first reset spring (41) located between the through hole (40) and the reset button (8), and the first movable hole (22) is provided with a second reset spring (42) located at the lower end of the test push rod (7).

8. The leakage protection socket according to claim 1, characterized in that: One end of the elastic power live wire and neutral wire input metal sheet (15) is bent downward by 90 degrees, passes through the zero-sequence current transformer (16), and is welded to the control circuit board (2) together with the power input terminal (11); the other ends of a pair of elastic power live wire and neutral wire input metal sheets (15) are respectively divided into two movable contact arms (43) in a horizontal direction, and a movable contact point (44) is respectively provided in parallel on the top surface of the end of each movable contact arm (43), and two pairs of four movable contacts (44) are provided in parallel at the ends of the four movable contact arms (43); a pair of the power live wire and neutral wire output conductors ( A pair of static contacts (25) are respectively arranged at positions vertically corresponding to a pair of moving contacts (44) on the moving contact arm (43) of the elastic power live wire and neutral wire input metal sheet (15) above and below; a pair of static contacts (25) are also respectively arranged at positions vertically corresponding to another pair of moving contacts (44) on the moving contact arm (43) of the elastic power live wire and neutral wire input metal sheet (15) above and below on the pair of power live wire and neutral wire output metal sheets (13); the above two pairs of moving contacts (44) and the two pairs of static contacts (25) constitute two groups of four pairs of switches for live wires and neutral wires arranged in parallel.

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