Silver contact for low-voltage electrical apparatus with high safety

Abstract

This utility model relates to the field of silver contact technology for low-voltage electrical appliances, and in particular to a high-safety silver contact for low-voltage electrical appliances. It includes a first housing with a screw threadedly connected to its surface. A second housing is annularly arranged on the upper surface of the first housing. Two mounting cavities are formed inside the second housing, and snap-fit ​​devices are installed within each cavity. A button is slidably connected to the inner wall of the first housing. An emergency power-off device is installed inside the button. A reset device is provided between the push ring and the button. Two electrically connected moving contacts are located on the lower surface of the push ring, and two corresponding stationary contacts are located on the upper surface of the static ring. When the button fails to reset, the emergency power-off device, by screwing the push rod, disengages the stationary contacts from the moving contacts, putting the equipment in a shut-off state and preventing damage to the circuit and internal components.

Description

Technical Field

[0001] This utility model relates to the technical field of silver contacts for low-voltage electrical appliances, and in particular to a high-safety silver contact for low-voltage electrical appliances. Background Technology

[0002] Silver contacts broadly refer to the points where electronic devices separate and connect during opening and closing. Because metal conductor terminals easily generate instantaneous heat and sparks upon contact, these contacts are prone to oxidation and electrolysis during high-frequency use. Therefore, these contacts are often enlarged and thickened, or made of polymer metals. Thus, these polymer metal contacts, or thickened points made of the same material, are called silver contacts. However, if the device's button fails to reset, the device cannot be switched off, potentially leading to burnout of the circuitry and internal components. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-safety silver contact for low-voltage electrical appliances.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] Design a high-safety low-voltage electrical silver contact, comprising a first housing, a screw block threadedly connected to the surface of the first housing, a second housing annularly formed on the upper surface of the first housing, two mounting cavities inside the second housing, and snap-fit ​​devices inside the two mounting cavities, a button slidably connected to the inner wall of the first housing, an emergency power-off device inside the button, a first extension post on the lower surface of the button, a push ring slidably connected to the inner wall of the first housing at the lower end of the first extension post, a reset device between the push ring and the button, two electrically connected moving contacts on the lower surface of the push ring, a static ring slidably connected to the inner wall of the second housing, two stationary contacts corresponding one-to-one with the moving contacts on the upper surface of the static ring, a fixed ring fixedly connected to the inner wall of the first housing, and two terminals corresponding one-to-one with the stationary contacts on the lower surface of the first housing, the two terminals being electrically connected to their respective stationary contacts via a connecting device.

[0006] Preferably, the connecting device includes a second extension post, a flexible wire, and a limiting block. The lower end of the stationary contact is electrically connected to the second extension post. The second extension post passes through the fixing ring and is electrically connected to the flexible wire. The flexible wire passes through the fixing ring and is electrically connected to the terminal. The surface of the second extension post is provided with a limiting block.

[0007] Preferably, the reset device includes a retaining ring and a first spring. The retaining ring is provided on the inner wall of the first housing and is disposed between the push ring and the button. The first spring is fitted outside the first insertion post and is disposed between the retaining ring and the button.

[0008] Preferably, the locking device includes a second spring, a slider, a locking post, an inclined surface, an annular groove, and a lifting groove. The inner walls of the two mounting cavities on opposite sides are provided with a second spring. The two second springs are provided with a locking post at their opposite ends. The two locking posts are provided with an upward-facing inclined surface at their opposite ends. The button's circumferential surface is provided with an annular groove and multiple longitudinal lifting grooves. The annular groove and lifting grooves are matched with the locking post. The two locking posts penetrate the mounting cavity and extend into the annular groove.

[0009] Preferably, the emergency power-off device includes a through hole, a nut, a push rod, an internal hexagonal groove, a positioning hole, a slide rod, a third spring, and an end block. The button, the first insertion post, and the push ring all share a through hole. A nut is threaded onto the inner wall of the through hole. A push rod is provided at the lower end of the nut. An internal hexagonal groove is provided on the upper surface of the nut. A positioning hole is provided in the middle of the upper surface of the static ring. The lower end of the push rod extends into the positioning hole. A slide rod is provided on the lower surface of the static ring. A third spring is fitted around the slide rod. The third spring is positioned between the static ring and the fixed ring. The lower end of the slide rod slides through the fixed ring and is provided with an end block.

[0010] Preferably, the lower end of the fixing ring is provided with a shielding cylinder, and the sliding rod is disposed inside the shielding cylinder.

[0011] This invention proposes a high-safety silver contact for low-voltage electrical appliances. Its advantages are as follows: If the button malfunctions and cannot be rotated upwards, an emergency power-off device is used. By inserting a hex wrench into the internal hexagonal slot and then tightening the nut, the push rod disengages from the positioning hole. Because the static ring is slidably connected to the inner wall of the first housing, the stationary contact disengages from the moving contact, thereby cutting off power to the connected equipment and achieving the function of emergency power-off. In summary, when the button cannot be reset, the emergency power-off device, by rotating the push rod, disengages the stationary contact from the moving contact, putting the equipment in a shut-off state and preventing the circuit and internal components of the equipment from burning out. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the button structure of this utility model.

[0015] In the diagram: 1. First housing; 2. Second housing; 3. Button; 4. First insertion post; 5. Push ring; 6. Moving contact; 7. Static ring; 8. Static contact; 9. Fixed ring; 10. Second insertion post; 11. Flexible wire; 12. Terminal; 13. Rotating block; 14. Mounting cavity; 15. Limiting block; 16. Clamping ring; 17. First spring; 18. Second spring; 19. Slider; 20. Snap-fit ​​post; 21. Inclined surface; 22. Annular groove; 23. Lifting groove; 24. Covering cylinder; 25. Through hole; 26. Nut; 27. Top rod; 28. Socket hexagonal groove; 29. ​​Positioning hole; 30. Slide rod; 31. Third spring; 32. End block. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] Reference Figure 1-3 A high-safety low-voltage electrical silver contact includes a first housing 1, on the surface of which a screw block 13 is threadedly connected. The first housing 1 can be fixed by inserting it into a pre-drilled mounting hole and then screwing the screw block 13. A second housing 2 is annularly arranged on the upper surface of the first housing 1. The second housing 2 has two mounting cavities 14 inside, each containing a snap-fit ​​device. A button 3 is slidably connected to the inner wall of the first housing 1. An emergency power-off device is located inside the button 3. A first insertion post 4 is located on the lower surface of the button 3. A push ring 5, slidably connected to the inner wall of the first housing 1, is located at the lower end of the first insertion post 4. A reset device is located between the push ring 5 and the button 3. Two electrically connected moving contacts 6 are located on the lower surface of the push ring 5. A static ring 7 is slidably connected to the inner wall of the second housing 2. Two stationary contacts 8, corresponding one-to-one with the moving contacts 6, are located on the upper surface of the static ring 7. A fixing ring 9 is fixedly connected to the inner wall of the first housing 1. Two terminals 12, corresponding one-to-one with the stationary contacts 8, are located on the lower surface of the first housing 1. The two terminals 12 are electrically connected to their respective stationary contacts 8 via a connecting device.

[0018] The connecting device includes a second insertion post 10, a flexible wire 11, and a limiting block 15. The lower end of the stationary contact 8 is electrically connected to the second insertion post 10. The second insertion post 10 passes through the fixing ring 9 and is electrically connected to the flexible wire 11. The flexible wire 11 passes through the fixing ring 9 and is electrically connected to the terminal 12. The surface of the second insertion post 10 is provided with a limiting block 15.

[0019] The reset device includes a retaining ring 16 and a first spring 17. The retaining ring 16 is provided on the inner wall of the first housing 1. The retaining ring 16 is located between the push ring 5 and the button 3. The first spring 17 is fitted on the outside of the first insertion post 4. The first spring 17 is located between the retaining ring 16 and the button 3.

[0020] The locking device includes a second spring 18, a slider 19, a locking post 20, an inclined surface 21, an annular groove 22, and a lifting groove 23. The inner walls of the two mounting cavities 14 on opposite sides are provided with a second spring 18. The two second springs 18 are provided with a locking post 20 at their opposite ends. The two locking posts 20 are provided with an upward-facing inclined surface 21 at their opposite ends. The button 3 has an annular groove 22 and multiple longitudinal lifting grooves 23 on its circumferential surface. The annular groove 22 and the lifting grooves 23 are matched with the locking post 20. The two locking posts 20 penetrate the mounting cavity 14 and extend into the annular groove 22.

[0021] The emergency power-off device includes a through hole 25, a nut 26, a push rod 27, an internal hexagonal groove 28, a positioning hole 29, a slide rod 30, a third spring 31, and an end block 32. The button 3, the first insert post 4, and the push ring 5 are all provided with a through hole 25. The inner wall of the through hole 25 is threaded with a nut 26. The lower end of the nut 26 is provided with a push rod 27. The upper surface of the nut 26 is provided with an internal hexagonal groove 28. The middle part of the upper surface of the static ring 7 is provided with a positioning hole 29. The lower end of the push rod 27 extends into the positioning hole 29. The lower surface of the static ring 7 is provided with a slide rod 30. The slide rod 30 is fitted with a third spring 31. The third spring 31 is located between the static ring 7 and the fixed ring 9. The lower end of the slide rod 30 slides through the fixed ring 9 and is provided with an end block 32.

[0022] The lower end of the fixing ring 9 is provided with a shielding cylinder 24, and the sliding rod 30 is located inside the shielding cylinder 24. The shielding cylinder 24 serves to shield and prevent the sliding rod 30 from contacting the flexible wire 11.

[0023] Working principle: By connecting the two terminals 12 to both ends of the device, and through the connecting device, the two terminals 12 are electrically connected to the corresponding stationary contacts 8. Then, by pressing the button 3, the button 3 presses the locking post 20 through the locking device. The inclined surface 21 facilitates the downward sliding of the button 3, and then the locking post 20 is locked onto the annular groove 22, fixing the button 3. At this time, the two moving contacts 6 are in contact with the two stationary contacts 8 respectively, connecting the two stationary contacts 8 and making the connected device run. If the moving contacts 6 and the stationary contacts 8 are separated, the connected device is de-energized. By turning the button 3, the locking post 20 is moved into the lifting groove 23. Through the reset device, the first spring 1... 7. Under the action of elastic compression, button 3 is lifted, thereby causing the moving contact 6 to disengage from the stationary contact 8, thus de-energizing the connected equipment. If button 3 malfunctions and cannot be rotated upwards, the emergency power-off device can be used. By inserting a hex wrench into the internal hexagonal slot 28 and then tightening the nut 26, the push rod 27 disengages from the positioning hole 29. Since the static ring 7 is slidably connected to the inner wall of the first housing 1, the stationary contact 8 disengages from the moving contact 6, thus de-energizing the connected equipment and achieving the function of emergency power-off. To reset the emergency power-off device, simply rotate the push rod 27 in the opposite direction. Under the elastic force of the third spring 31, the static ring 7 is pushed upwards, causing the moving contact 6 and the stationary contact 8 to contact. In summary, when button 3 cannot be reset, the emergency power-off device, by rotating the push rod 27, disengages the stationary contact 8 from the moving contact 6, putting the equipment in a shut-off state and preventing the circuit and internal components of the equipment from burning out.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-safety silver contact for low-voltage electrical appliances, comprising a first housing (1), characterized in that, The first housing (1) has a screw block (13) threadedly connected to its surface. The upper surface of the first housing (1) is provided with a second housing (2) in annular shape. The second housing (2) has two mounting cavities (14) inside. The two mounting cavities (14) are provided with snap-fit ​​devices. The inner wall of the first housing (1) is slidably connected with a button (3). The button (3) is provided with an emergency power-off device. The lower surface of the button (3) is provided with a first insertion post (4). The lower end of the first insertion post (4) is provided with a push ring (5) slidably connected to the inner wall of the first housing (1). 5) A reset device is provided between the push ring (5) and the button (3). The lower surface of the push ring (5) is provided with two moving contacts (6) that are electrically connected to each other. The inner wall of the second housing (2) is slidably connected with a static ring (7). The upper surface of the static ring (7) is provided with two stationary contacts (8) that correspond one-to-one with the moving contacts (6). The inner wall of the first housing (1) is fixedly connected with a fixed ring (9). The lower surface of the first housing (1) is provided with two terminals (12) that correspond one-to-one with the stationary contacts (8). The two terminals (12) are electrically connected to their respective stationary contacts (8) through a connecting device.

2. The high-safety silver contact for low-voltage electrical appliances according to claim 1, characterized in that, The connecting device includes a second insertion post (10), a flexible wire (11), and a limiting block (15). The lower end of the stationary contact (8) is electrically connected to the second insertion post (10). The second insertion post (10) passes through the fixing ring (9) and is electrically connected to the flexible wire (11). The flexible wire (11) passes through the fixing ring (9) and is electrically connected to the terminal (12). The surface of the second insertion post (10) is provided with a limiting block (15).

3. The high-safety silver contact for low-voltage electrical appliances according to claim 1, characterized in that, The reset device includes a retaining ring (16) and a first spring (17). The retaining ring (16) is provided on the inner wall of the first housing (1). The retaining ring (16) is disposed between the push ring (5) and the button (3). The first spring (17) is fitted on the outside of the first insertion post (4). The first spring (17) is disposed between the retaining ring (16) and the button (3).

4. The high-safety silver contact for low-voltage electrical appliances according to claim 1, characterized in that, The snap-fit ​​device includes a second spring (18), a slider (19), a snap-fit ​​post (20), an inclined surface (21), an annular groove (22), and a lifting groove (23). The inner walls of the two mounting cavities (14) on opposite sides are provided with a second spring (18). The two second springs (18) are provided with a snap-fit ​​post (20) at opposite ends. The two snap-fit ​​posts (20) are provided with an upward inclined surface (21) at opposite ends. The button (3) has an annular groove (22) and multiple longitudinal lifting grooves (23) on its circumferential surface. The annular groove (22) and the lifting grooves (23) are matched with the snap-fit ​​post (20). The two snap-fit ​​posts (20) penetrate the mounting cavity (14) and extend into the annular groove (22).

5. A high-safety silver contact for low-voltage electrical appliances according to claim 1, characterized in that, The emergency power-off device includes a through hole (25), a nut (26), a push rod (27), an internal hexagonal groove (28), a positioning hole (29), a slide rod (30), a third spring (31), and an end block (32). The button (3), the first insertion post (4), and the push ring (5) are all provided with a through hole (25). The inner wall of the through hole (25) is threaded with a nut (26). The lower end of the nut (26) is provided with a push rod (27). The upper surface of the nut (26) is... The surface of the static ring (7) has an internal hexagonal groove (28). The upper surface of the static ring (7) has a positioning hole (29) in the middle. The lower end of the top rod (27) extends into the positioning hole (29). The lower surface of the static ring (7) has a slide rod (30). The slide rod (30) is fitted with a third spring (31). The third spring (31) is located between the static ring (7) and the fixed ring (9). The lower end of the slide rod (30) slides through the fixed ring (9) and has an end block (32).

6. A high-safety silver contact for low-voltage electrical appliances according to claim 5, characterized in that, The lower end of the fixed ring (9) is provided with a shielding cylinder (24), and the slide rod (30) is located inside the shielding cylinder (24).

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