Leakage protection switch

Abstract

The utility model discloses a leakage protection switch, which comprises a base, a cover body, a leakage protection module, an operating mechanism and a contact system, the contact system comprises a wire inlet terminal and a wire outlet terminal which are arranged on the base, a first conducting strip electrically connected to the wire inlet terminal, a second conducting strip electrically connected to the wire outlet terminal, a movable contact spring connected with the first conducting strip through a wire, a movable contact installed on the movable contact spring, and a static contact installed on the second conducting strip; the contact system further comprises a limiting piece, a pressing block and a spring, the limiting piece is connected with the base, one end of the movable contact spring is movably connected to the limiting piece, the pressing block is in linkage connection with the operating mechanism, the pressing block abuts against the upper portion of the other end of the movable contact spring, one end of the spring abuts against the base, and the other end of the spring abuts against the bottom face of the middle of the movable contact spring. The spring is used for pushing the movable reed to reset. According to the utility model, the movable contact spring is reset through the spring, the structure is safer and more reliable, and the service life is longer.

Description

Technical Field

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

[0002] With the increasing popularity of industrial production facilities and household appliances, people have more and more opportunities to come into contact with electricity, and electrical equipment failures leading to electric shock casualties often occur. For personal safety and equipment safety, leakage protection switches have been widely used as an effective electrical safety technology device and have played a vital role.

[0003] The utility model patent with patent application number CN201821251640.X discloses a leakage protection switch, which includes a base, a cover, a leakage protection module, an operating mechanism, and a contact system. The contact system includes a moving spring piece that is linked with the operating mechanism, a moving contact point that is arranged on one end of the moving spring piece, a stationary contact that is arranged in the base and matches the moving spring piece, and a stationary contact point that is arranged on the stationary contact. A conductive sheet is arranged on the other end of the moving spring piece, and the moving spring piece and the conductive sheet are fixed to the base by screws. In this structure, the moving spring piece is pressed down by the operating mechanism and deformed downward, so that the moving contact point and the stationary contact point abut against each other to achieve electrical conduction. When the operating mechanism is separated from the moving spring piece, the moving spring piece returns to its original state by its own restoring force, so that the moving contact point and the stationary contact point are separated and the power is cut off. However, the service life of the moving spring using this structure is short. When the moving spring is deformed, the stress is concentrated at the bend. After long-term use, metal fatigue is likely to occur, resulting in the inability to return to its original shape when deformed. In the worst case, when the operating mechanism is separated from the moving spring, the moving contact and the static contact still maintain a resistive electrical connection, causing the leakage protection function to fail and cause a safety accident. Utility Model Content

[0004] The utility model aims to provide a leakage protection switch. The utility model resets the moving spring piece through a spring, and the structure is safer and more reliable, and the service life is longer.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a leakage protection switch, comprising a base, a cover, a leakage protection module, an operating mechanism and a contact system, wherein the contact system comprises an incoming terminal and an outgoing terminal arranged on the base, a first conductive sheet electrically connected to the incoming terminal, a second conductive sheet electrically connected to the outgoing terminal, a movable spring connected to the first conductive sheet through a wire, a movable contact installed on the movable spring and a static contact installed on the second conductive sheet; the contact system also comprises a limit member, a pressure block and a spring, the limit member is connected to the base, one end of the movable spring is movably connected to the limit member, the pressure block is linked to the operating mechanism, and the pressure block abuts against the upper part of the other end of the movable spring, one end of the spring abuts against the base, and the other end of the spring abuts against the bottom surface of the middle part of the movable spring, so as to push the movable spring to reset.

[0006] By adopting the above technical solution, under normal conditions, the operating mechanism will drive the pressure block to press down one end of the moving spring piece, causing the moving contact on the moving spring piece to abut against the static contact on the second conductive sheet to achieve electrical conduction. At this time, the spring is compressed to store energy; when leakage and electric shock occur, and the action current value specified by the leakage protection switch is reached, the operating mechanism will be separated from the pressure block, and the moving spring piece and the pressure block will return to their original positions under the action of the spring. At this time, the moving contact and the static contact are disconnected, thereby disconnecting the power supply. The spring resets the moving spring piece, and the structure is safer and more reliable, with a longer service life.

[0007] The utility model is further configured such that a first positioning protrusion protruding downward is provided in the middle of the movable spring piece, a second positioning protrusion corresponding to the first positioning protrusion is provided on the base, and both ends of the spring are respectively sleeved on the first positioning protrusion and the second positioning protrusion.

[0008] By adopting the above technical solution, the spring can be positioned, the stability of the spring installation and action process can be improved, displacement or deformation that deviates from the center axis direction during action can be avoided, and its service life can also be increased.

[0009] The utility model is further configured such that the limiting member includes a limiting screw, the limiting screw includes a smooth rod portion and a screw head and a screw rod portion arranged at both ends of the smooth rod portion, the screw rod portion of the limiting screw is threadedly connected to the base, an oblong hole is provided on the movable spring piece along the length direction, the smooth rod portion of the limiting screw passes through the oblong hole, and the screw head of the limiting screw constitutes an upper stroke limit for the movable spring piece.

[0010] By adopting the above technical solution, the limiting structure is simple and reliable, allowing the movable spring to be displaced vertically and swing at a certain angle during the movement, with a higher degree of freedom, and the movable spring can also be limited in the upward stroke through the screw head.

[0011] The utility model is further configured as follows: a through hole is provided on the base, an inner hexagonal groove is provided at the outer end of the base corresponding to the through hole, a hexagonal nut is embedded in the inner hexagonal groove, and the screw portion of the limit screw passes through the through hole and is threadedly connected with the hexagonal nut.

[0012] By adopting the above technical solution, there is no need to drill screw holes on the base. Even if the thread of the hexagonal nut is damaged, the hexagonal nut can be directly replaced without replacing the entire base, which reduces the subsequent maintenance cost.

[0013] The utility model is further configured that the base is provided with limiting protrusions at positions corresponding to both sides of the movable spring piece, a first guide channel is formed between the two limiting protrusions, and the movable spring piece is movably arranged in the first guide channel.

[0014] By adopting the above technical solution, the movable spring piece can be limited and guided to ensure the stability of its activity process.

[0015] The utility model is further configured such that a first bending portion for connecting a wire is vertically arranged at one end of the first conductive sheet close to the movable spring sheet, and a second bending portion for connecting a wire is vertically arranged at one end of the movable spring sheet close to the first conductive sheet.

[0016] By adopting the above technical solution, the first bending portion and the second bending portion are respectively provided on the first conductive sheet and the movable spring sheet, which facilitates the welding of the wires and is beneficial to the early assembly production and the later maintenance operations.

[0017] The utility model is further configured that a second guide channel is vertically arranged on the base, and the pressing block is vertically slidably arranged in the second guide channel.

[0018] By adopting the above technical solution, the stability of the pressing block during the up and down movement can be ensured.

[0019] The utility model is further configured that the bottom of the pressing block is provided with a protrusion for contacting with the moving spring sheet when descending.

[0020] By adopting the above technical solution, when the movable spring piece is deformed under the action of the pressure block, a relative displacement will occur between the movable spring piece and the pressure block. A protrusion is provided at the bottom of the pressure block to abut against the movable spring piece, which can reduce the contact area, reduce friction, and make the cooperation between the two smoother.

[0021] The utility model is further configured that a plurality of weight-reducing grooves are provided on the pressing block.

[0022] By adopting the above technical solution, the weight of the pressing block can be reduced, which can not only save the use of raw materials and reduce costs, but also reduce the spring load and increase the service life of the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of the utility model as a whole;

[0024] Figure 2 It is a schematic diagram of the internal structure of the utility model as a whole;

[0025] Figure 3 A cross-sectional view of the utility model as a whole;

[0026] Figure 4 This is a schematic diagram of the structure of the utility model after the cover and the base are removed as a whole;

[0027] Figure 5 It is a structural schematic diagram of the base of the utility model;

[0028] Figure 6 It is a structural schematic diagram of the movable reed of the utility model;

[0029] Figure 7 It is a structural schematic diagram of the pressing block of the utility model.

[0030] In the figure: 1. base; 2. cover; 3. leakage protection module; 4. operating mechanism; 5. contact system; 6. incoming terminal; 7. outgoing terminal; 8. first conductive sheet; 9. second conductive sheet; 10. moving spring sheet; 11. moving contact; 12. static contact; 13. limiting member; 14. pressure block; 15. spring; 16. first positioning protrusion; 17. second positioning protrusion; 18. limiting screw; 19. bare rod; 20. screw head; 21. screw rod; 22. oblong hole; 23. through hole; 24. hexagonal socket; 25. hexagonal nut; 26. limiting protrusion; 27. first guide channel; 28. first bending portion; 29. ​​second bending portion; 30. second guide channel; 31. protrusion; 32. weight reduction groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Example: As attached Figures 1 to 7The leakage protection switch shown in the figure includes a base 1, a cover 2, a leakage protection module 3, an operating mechanism 4 and a contact system 5, wherein the operating mechanism 44 includes a bracket arranged in the base 11, a tripping pressure plate rotatably arranged on the bracket, a swing arm movably arranged on the bracket and matched with the tripping pressure plate, and a dial button rotatably arranged on the upper end of the bracket for driving the swing arm to rotate; the contact system 5 includes an incoming terminal 6 and an outgoing terminal 7 arranged on the base 1, a first conductive sheet 8 electrically connected to the incoming terminal 6, a second conductive sheet 9 electrically connected to the outgoing terminal 7, a moving spring sheet 10 connected to the first conductive sheet 8 through a wire, a moving contact 11 installed on the moving spring sheet 10, and a contactor 20 arranged on the movable contactor 21. The static contact 12 is mounted on the second conductive sheet 9, the dynamic contact 11 is riveted to the dynamic spring sheet 10, the static contact 12 is riveted to the second conductive sheet 9, the first conductive sheet 8, the second conductive sheet 9 and the dynamic spring sheet 10 are all copper parts; the contact system 5 also includes a limit member 13, a pressure block 14 and a spring 15, the limit member 13 is connected to the base 1, one end of the dynamic spring sheet 10 is movably connected to the limit member 13, the pressure block 14 is linked to the operating mechanism 4, and the pressure block 14 abuts against the upper part of the other end of the dynamic spring sheet 10, one end of the spring 15 abuts against the base 1, and the other end of the spring 15 abuts against the bottom surface of the middle part of the dynamic spring sheet 10, which is used to push the dynamic spring sheet 10 to reset. Under normal conditions, the operating mechanism 4 will drive the pressing block 14 to press down one end of the moving spring 10, causing the moving contact 11 on the moving spring 10 to abut against the static contact 12 on the second conductive sheet 9 to achieve electrical conduction. At this time, the spring 15 is compressed to store energy. When leakage and electric shock occur, and the action current value specified by the leakage protection switch is reached, the operating mechanism 4 will be separated from the pressing block 14, and the moving spring 10 and the pressing block 14 will return to their original positions under the action of the spring 15. At this time, the moving contact 11 and the static contact 12 are disconnected, thereby disconnecting the power supply. The spring 15 resets the moving spring 10, and the structure is safer and more reliable, with a longer service life.

[0033] As attached Figure 3 As shown, the middle of the movable spring piece 10 is provided with a first positioning protrusion 16 protruding downward, and the first positioning protrusion 16 is formed by stamping. The base 1 is provided with a second positioning protrusion 17 corresponding to the first positioning protrusion 16, and the second positioning protrusion 17 and the base 1 are an integrated structure, and the two ends of the spring 15 are respectively sleeved on the first positioning protrusion 16 and the second positioning protrusion 17. This design can position the spring 15, improve the stability of the installation and action process of the spring 15, avoid displacement or deformation deviating from the central axis direction when it is in action, and also improve its service life.

[0034] As attached Figure 3As shown, the limiting member 13 includes a limiting screw 18, and the limiting screw 18 includes a bare rod 19 and a screw head 20 and a screw rod 21 arranged at both ends of the bare rod 19. The diameters of the screw head 20, the bare rod 19 and the screw rod 21 decrease successively. The screw rod 21 of the limiting screw 18 is threadedly connected to the base 1. An oblong hole 22 is provided on the movable spring 10 along the length direction. The bare rod 19 of the limiting screw 18 passes through the oblong hole 22. The diameter of the bare rod 19 is equivalent to the width of the oblong hole 22, and the screw head 20 of the limiting screw 18 constitutes an upper stroke limit for the movable spring 10. The limiting structure is simple and reliable, allowing the movable spring 10 to move vertically and swing at a certain angle during the movement, with a higher degree of freedom, and the movable spring 10 can also be limited in the upper stroke through the screw head 20.

[0035] As attached Figure 3 As shown, the base 1 is provided with a through hole 23, and the base 1 is provided with a hexagonal groove 24 at the outer end corresponding to the through hole 23, and a hexagonal nut 25 is embedded in the hexagonal groove 24. The screw portion 21 of the limit screw 18 passes through the through hole 23 and is threadedly connected with the hexagonal nut 25. There is no need to drill a screw hole on the base 1. Even if the thread of the hexagonal nut 25 is damaged, the hexagonal nut 25 can be directly replaced without replacing the entire base 1, and the later maintenance cost is lower.

[0036] As attached Figure 3 and attached Figure 5 As shown, the base 1 is provided with limiting protrusions 26 at positions corresponding to both sides of the movable spring piece 10, the limiting protrusions 26 and the base 1 are an integrated structure, a first guide channel 27 is formed between the two limiting protrusions 26, the width of the first guide channel 27 is equivalent to the width of the movable spring piece 10, and the movable spring piece 10 is movably arranged in the first guide channel 27. This design can limit and guide the movable spring piece 10 to ensure the stability of its activity process.

[0037] As attached Figure 4 As shown, a first bending portion 28 for connecting a wire is vertically provided at one end of the first conductive sheet 8 close to the movable spring sheet 10, and a second bending portion 29 for connecting a wire is vertically provided at one end of the movable spring sheet 10 close to the first conductive sheet 8. The first bending portion 28 and the second bending portion 29 are respectively provided on the first conductive sheet 8 and the movable spring sheet 10, which facilitates the welding of the wire, and is beneficial to the early assembly production and the later maintenance operation.

[0038] As attached Figure 3 and attached Figure 5 As shown, the base 1 is vertically provided with a second guide channel 30, and the pressing block 14 is vertically slidably arranged in the second guide channel 30. This design can ensure the stability of the pressing block 14 during the up and down movement.

[0039] As attached Figure 7 As shown, the bottom of the pressure block 14 is provided with a protrusion 31 for contacting with the moving spring piece 10 when descending, and the protrusion 31 and the pressure block 14 are an integrated structure, and the protrusion 31 is a cylindrical structure. When the moving spring piece 10 is deformed under the action of the pressure block 14, a relative displacement will occur between the moving spring piece 10 and the pressure block 14. The protrusion 31 is provided at the bottom of the pressure block 14 for contacting with the moving spring piece 10, which can reduce the contact area, reduce friction, and make the cooperation between the two smoother.

[0040] As attached Figure 7 As shown, the pressing block 14 is provided with a plurality of weight-reducing grooves 32 , which can reduce the weight of the pressing block 14 , which can not only save the use of raw materials and reduce costs, but also reduce the load on the spring 15 and increase the service life of the spring 15 .

Claims

1. A leakage protection switch, comprising a base (1), a cover (2), a leakage protection module (3), an operating mechanism (4) and a contact system (5), wherein the contact system (5) comprises an incoming terminal (6) and an outgoing terminal (7) arranged on the base (1), a first conductive sheet (8) electrically connected to the incoming terminal (6), a second conductive sheet (9) electrically connected to the outgoing terminal (7), a movable spring sheet (10) connected to the first conductive sheet (8) via a wire, a movable contact (11) mounted on the movable spring sheet (10) and a stationary contact (12) mounted on the second conductive sheet (9); characterized in that: The contact system (5) further comprises a limit member (13), a pressure block (14) and a spring (15); the limit member (13) is connected to the base (1); one end of the movable spring (10) is movably connected to the limit member (13); the pressure block (14) is linked to the operating mechanism (4); and the pressure block (14) abuts against the upper part of the other end of the movable spring (10); one end of the spring (15) abuts against the base (1); and the other end of the spring (15) abuts against the bottom surface of the middle part of the movable spring (10), so as to push the movable spring (10) to reset.

2. The leakage protection switch according to claim 1, characterized in that: A first positioning protrusion (16) protruding downward is provided in the middle of the movable spring piece (10), a second positioning protrusion (17) corresponding to the first positioning protrusion (16) is provided on the base (1), and two ends of the spring (15) are respectively sleeved on the first positioning protrusion (16) and the second positioning protrusion (17).

3. The leakage protection switch according to claim 1, characterized in that: The limiting member (13) comprises a limiting screw (18), and the limiting screw (18) comprises a smooth rod portion (19) and a screw head (20) and a screw rod portion (21) arranged at both ends of the smooth rod portion (19); the screw rod portion (21) of the limiting screw (18) is threadedly connected to the base (1); an oblong hole (22) is provided on the movable spring (10) along the length direction; the smooth rod portion (19) of the limiting screw (18) passes through the oblong hole (22), and the screw head (20) of the limiting screw (18) constitutes an upper stroke limit for the movable spring (10).

4. The leakage protection switch according to claim 3, characterized in that: The base (1) is provided with a through hole (23), the base (1) is provided with a hexagonal groove (24) at the outer end corresponding to the through hole (23), a hexagonal nut (25) is embedded in the hexagonal groove (24), and the screw portion (21) of the limit screw (18) passes through the through hole (23) and is threadedly connected to the hexagonal nut (25).

5. The leakage protection switch according to claim 1, characterized in that: The base (1) is provided with limiting protrusions (26) at positions corresponding to both sides of the movable spring piece (10), a first guide channel (27) is formed between the two limiting protrusions (26), and the movable spring piece (10) is movably arranged in the first guide channel (27).

6. The leakage protection switch according to claim 1, characterized in that: A first bending portion (28) for connecting a wire is vertically arranged at one end of the first conductive sheet (8) close to the movable spring sheet (10), and a second bending portion (29) for connecting a wire is vertically arranged at one end of the movable spring sheet (10) close to the first conductive sheet (8).

7. The leakage protection switch according to claim 1, characterized in that: A second guide channel (30) is vertically arranged on the base (1), and the pressing block (14) is vertically slidably arranged in the second guide channel (30).

8. The leakage protection switch according to claim 1, characterized in that: The bottom of the pressing block (14) is provided with a protrusion (31) for abutting against the movable spring sheet (10) when descending.

9. The leakage protection switch according to claim 1, characterized in that: The pressing block (14) is provided with a plurality of weight-reducing grooves (32).

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