A direct current protection device with leakage current detection

Abstract

The application discloses a direct current protection device with leakage current detection, and relates to the technical field of leakage protection.The direct current protection device comprises a shell, two contact point assemblies fixed symmetrically in the shell, and a line connected to the two contact point assemblies; a fixed ring fixed to the bottom end of the shell and located at the middle position of the two contact point assemblies; a leakage detection assembly rotatably arranged on the fixed ring and in contact connection with the two contact point assemblies; and a switch slidably arranged on the shell and connected with the leakage detection assembly; wherein the upper and lower end faces of the shell are detachably provided with cover plates, and the shell is externally connected with a grounding wire.

Description

Technical Field

[0001] This invention relates to the field of leakage current protection technology, specifically a DC protection device with leakage current detection. Background Technology

[0002] Leakage current detection and protection devices are mainly used to protect equipment from leakage current faults and to protect people from electric shock that could be fatal. They have overload and short circuit protection functions and can be used to protect lines or motors from overload and short circuit. They can also be used for infrequent switching and starting of lines under normal conditions.

[0003] In existing leakage current detection and protection devices, the spring of the switch is always in a compressed or stretched state when the power is on. This leads to a decrease in spring performance after prolonged power supply, resulting in untimely power cut-off. Furthermore, the use of spring contacts for contact during power supply makes them susceptible to external vibrations, causing unstable power supply. In addition, the switches of existing leakage current detection and protection devices are all push-button type, which do not have a function to prevent accidental touch.

[0004] To address the above problems, this invention provides a DC protection device with leakage current detection to solve the aforementioned issues. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a DC protection device with leakage current detection, comprising:

[0006] The housing contains two symmetrically fixed contact assemblies, both of which are connected to a circuit.

[0007] A retaining ring is fixed inside the bottom of the housing and located in the middle of the two contact assemblies;

[0008] The leakage current detection component is rotatably mounted on the fixed ring and is in contact with the two contact components.

[0009] The switch is slidably mounted on the housing and connected to the leakage current detection component;

[0010] The housing is equipped with detachable cover plates on both the upper and lower end faces, and a grounding wire is connected to the outside of the housing.

[0011] Further, preferably, the contact assembly includes:

[0012] Insulating posts are fixed inside the housing;

[0013] The connecting end is fixed to the insulating post;

[0014] The terminal is sleeved on the insulating post and contacts the connection end;

[0015] Fasteners, threaded connections to the insulating post;

[0016] The contact post is slidably sleeved on the connection end.

[0017] Furthermore, preferably, the connecting end is provided with a plurality of pressing balls circumferentially arranged on one side wall inside the contact post, and a spring is provided between the plurality of pressing balls and the connecting end, and a pressing spring is provided between the connecting end and the contact post.

[0018] Further, preferably, the leakage current detection component includes:

[0019] A rotating ring is rotatably mounted on the fixed ring.

[0020] The opening and closing ring is fixed on the rotating ring and is rotatably connected to the housing;

[0021] Two contacts are configured and symmetrically fixed on the rotating ring;

[0022] The coil is fixed between the two contacts and is coaxially arranged with the rotating ring;

[0023] An arc-extinguishing grid is fixed inside the rotating ring, encloses the contact, and does not contact the contact.

[0024] The iron column is slidably mounted on the fixed ring using a limiting post, and is coaxially located inside the coil.

[0025] Furthermore, preferably, two limiting strips are symmetrically fixed to the side wall of the limiting post, a driving post is fixed to the end of the iron column away from the limiting post, a pushing post is slidably arranged on the side wall of the driving post, and a pushing spring is arranged between the pushing post and the driving post.

[0026] Furthermore, preferably, the end of the drive column away from the iron column is threadedly connected to the switch, and a return spring is provided between the drive column and the housing, and the return spring is sleeved on the outer wall of the switch.

[0027] Furthermore, preferably, the inner circumference of the opening and closing ring is provided with four rotating grooves and four resetting grooves. The four rotating grooves are all arranged at an angle, and the four resetting grooves are all arranged vertically. The four rotating grooves and the four resetting grooves together constitute a driving groove, and the pushing column is slidably disposed in the driving groove.

[0028] Furthermore, preferably, a first step is provided at the top junction of the rotating groove and the reset groove, and a second step is provided at the bottom junction of the rotating groove and the reset groove, wherein the height of the first step is lower than the height of the second step.

[0029] Compared with the prior art, the present invention provides a DC protection device with leakage current detection, which has the following advantages:

[0030] In this invention, the point contact between the contact assembly and the contact point enables rapid disconnection of the circuit in case of leakage, thereby improving safety. Furthermore, the contact assembly ensures that the contact post remains in contact with the contact point, preventing the influence of external vibrations and improving the stability of power supply. The pull-type switch effectively prevents accidental contact. When leakage occurs, the current through the coil increases, causing the iron post to slide. This pushes the post, causing the opening and closing rings and the rotating ring to rotate synchronously, disengaging the contact post and completing the power-off protection. At this time, the arc-extinguishing grid reduces the electric arc at the contact point, improving safety. Under normal power supply, the reset spring is in a balanced state, meaning it is not subject to external force, thus preventing the spring from being in a compressed or stretched state for extended periods, which could affect its performance and improve the timeliness of power-off. Attached Figure Description

[0031] Figure 1 This is a schematic cross-sectional view of a DC protection device with leakage current detection.

[0032] Figure 2 This is a schematic diagram of the contact assembly of a DC protection device with leakage current detection.

[0033] Figure 3 This is a schematic diagram of the leakage current detection component of a DC protection device with leakage current detection.

[0034] Figure 4 A schematic cross-sectional view of the opening and closing ring structure of a DC protection device with leakage current detection;

[0035] In the diagram: 1. Housing; 2. Wiring; 3. Contact assembly; 4. Retaining ring; 5. Leakage detection assembly; 6. Switch; 31. Insulating post; 32. Connection end; 33. Terminal; 34. Fastener; 35. Press ball; 36. Contact post; 37. Press spring; 52. Rotating ring; 53. Opening and closing ring; 54. Contact; 55. Coil; 56. Arc extinguishing grid; 57. Iron column; 571. Limiting post; 572. Limiting strip; 573. Drive post; 574. Push post; 575. Return spring; 531. Rotating groove; 532. Return groove; 533. Step one; 534. Step two. Detailed Implementation

[0036] Reference Figures 1-4 This invention provides a technical solution: a DC protection device with leakage current detection, comprising:

[0037] The housing 1 has two contact assemblies 3 symmetrically fixed inside it, and both contact assemblies 3 are connected to the line 2;

[0038] The retaining ring 4 is fixed inside the bottom of the housing 1 and is located in the middle of the two contact assemblies 3;

[0039] The leakage current detection component 5 is rotatably mounted on the fixed ring 4 and is in contact with the two contact components 3;

[0040] Switch 6 is slidably mounted on the housing 1 and connected to the leakage current detection component 5;

[0041] The housing 1 has cover plates that can be detachably installed on both the upper and lower end faces, and a grounding wire is connected to the outside of the housing 1.

[0042] In this embodiment, the contact component 3 includes:

[0043] Insulating post 31 is fixed inside the housing 1;

[0044] The connecting end 32 is fixed on the insulating post 31;

[0045] Terminal 33 is sleeved on the insulating post 31 and contacts the connecting end 32;

[0046] Fastener 34 is threaded onto the insulating post 31;

[0047] The contact post 36 is slidably sleeved on the connecting end 32.

[0048] In other words, the point contact between the contact post 36 and the leakage detection component 5 can quickly disconnect the circuit in the event of a leakage, thereby improving safety.

[0049] In a preferred embodiment, the connecting end 32 is provided with a plurality of pressing balls 35 circumferentially arranged on one side wall inside the contact post 36, and a spring is provided between the plurality of pressing balls 35 and the connecting end 32, and a pressing spring 37 is provided between the connecting end 32 and the contact post 36.

[0050] The multiple pressing balls 35 ensure that the connection end 32 and the contact post 36 are always in contact, improving the stability of the power supply. The pressing spring 37 ensures that the contact post 36 is always in contact with the contact 54, thereby avoiding the influence of external vibrations and further improving the stability of the power supply.

[0051] In this embodiment, the leakage current detection component 5 includes:

[0052] The rotating ring 52 is rotatably mounted on the fixed ring 4;

[0053] The opening and closing ring 53 is fixed on the rotating ring 52 and is rotatably connected to the housing 1;

[0054] Contact 54 is configured as two and symmetrically fixed on the rotating ring 52;

[0055] The coil 55 is fixed between the two contacts 54 and is coaxially arranged with the rotating ring 52;

[0056] The arc-extinguishing grid 56 is fixed inside the rotating ring 52, and wraps around the contact 54, but does not contact the contact 54.

[0057] The iron column 57 is slidably mounted on the fixed ring 4 by a limiting post 571 and is coaxially located inside the coil 55.

[0058] In a preferred embodiment, two limiting strips 572 are symmetrically fixed to the side wall of the limiting post 571, and a driving post 573 is fixed to the end of the iron column 57 away from the limiting post 571. A pushing post 574 is slidably arranged on the side wall of the driving post 573, and a pushing spring is arranged between the pushing post 574 and the driving post 573.

[0059] When leakage occurs, the current through coil 55 increases, causing iron column 57 to slide. This pushes column 574 to make opening and closing ring 53 and rotating ring 52 rotate synchronously, causing contact column 36 to disengage from contact 54, thus completing the power-off protection. At this time, the arc-extinguishing grid 56 can reduce the arc at contact 54 and improve safety.

[0060] In a preferred embodiment, the end of the drive column 573 away from the iron column 57 is threadedly connected to the switch 6, and a return spring 575 is provided between the drive column 573 and the housing 1, and the return spring 575 is sleeved on the outer wall of the switch 6.

[0061] In other words, switch 6 is a pull-type switch, which can effectively prevent accidental activation. When the power is on normally, the return spring 575 is in a balanced state, that is, it is not subject to external force. This prevents the return spring 575 from being in a compressed or stretched state for a long time, which would affect its performance and improve the timeliness of power-off.

[0062] In a preferred embodiment, the inner circumference of the opening and closing ring 53 is provided with four rotating grooves 531 and four resetting grooves 532. The four rotating grooves 531 are all arranged at an angle, and the four resetting grooves 532 are all arranged vertically. The four rotating grooves 531 and the four resetting grooves 532 together constitute a driving groove, and the pushing column 574 is slidably disposed in the driving groove.

[0063] In a preferred embodiment, a first step 533 is provided at the top junction of the rotating groove 531 and the reset groove 532, and a second step 534 is provided at the bottom junction of the rotating groove 531 and the reset groove 532, wherein the height of the first step 533 is lower than the height of the second step 534.

[0064] In other words, when a leakage current is detected, the current through coil 55 increases. At this time, push column 574 is located in rotating groove 531, and the push column 574 and rotating groove 531 move relative to each other through step two 534. When push column 574 and rotating groove 531 move relative to each other to step one 533, push column 574 can be located in reset groove 532 through step one 533, and iron column 52 is reset through reset spring 575. At this time, rotating ring 52 rotates 90 degrees relative to the initial position, which is the power-off state, thus completing the power-off protection. When power needs to be restored, switch 6 is pulled, causing push column 574 to drive rotating ring 52 and opening / closing ring 53 to rotate 90 degrees again, thus completing the power restoration operation.

[0065] Specifically, the point contact between contact assembly 3 and contact 54 enables rapid disconnection of the circuit in case of leakage, thereby improving safety. Contact assembly 3 ensures that contact post 36 remains in contact with the contact point, preventing the influence of external vibrations and improving the stability of power supply. Furthermore, the pull-type switch 6 effectively prevents accidental contact. When leakage occurs, the current through coil 55 increases, causing iron post 57 to slide. This pushes post 574, causing opening / closing ring 53 and rotating ring 52 to rotate synchronously, disengaging contact post 36 from contact 54 and completing the power-off protection. At this time, the arc-extinguishing grid 56 reduces the arc at contact 54, improving safety. During normal power supply, the reset spring 575 is in a balanced state, meaning it is not subject to external force, thus preventing the spring from being under prolonged compression or tension, which could affect its performance and improve the timeliness of power-off.

[0066] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A DC protection device with leakage current detection, characterized in that: include: The housing (1) has two contact assemblies (3) symmetrically fixed inside, and both contact assemblies (3) are connected to the circuit (2); A retaining ring (4) is fixed inside the bottom of the housing (1) and located in the middle of the two contact assemblies (3); The leakage current detection component (5) is rotatably mounted on the fixed ring (4) and is in contact with the two contact components (3); The switch (6) is slidably mounted on the housing (1) and connected to the leakage detection assembly (5); The upper and lower end faces of the housing (1) are detachably fitted with cover plates, and the housing (1) is connected to a grounding wire. The leakage current detection component (5) includes: Rotating ring (52) is rotatably mounted on the fixed ring (4); The opening and closing ring (53) is fixed on the rotating ring (52) and is rotatably connected to the housing (1); The contacts (54) are configured as two and symmetrically fixed on the rotating ring (52); The coil (55) is fixed between the two contacts (54) and is coaxially arranged with the rotating ring (52); An arc-extinguishing grid (56) is fixed inside the rotating ring (52), and wraps around the contact (54) without contacting the contact (54); The iron column (57) is slidably mounted on the fixed ring (4) by a limiting column (571) and is coaxially located inside the coil (55); The side wall of the limiting post (571) is symmetrically fixed with two limiting strips (572). The end of the iron column (57) away from the limiting post (571) is fixed with a driving post (573). The side wall of the driving post (573) is slidably provided with a pushing post (574). A pushing spring is provided between the pushing post (574) and the driving post (573).

2. The DC protection device with leakage current detection according to claim 1, characterized in that: The contact assembly (3) includes: An insulating post (31) is fixed inside the housing (1); The connecting end (32) is fixed on the insulating post (31); Terminal (33) is sleeved on the insulating post (31) and contacts the connecting end (32); Fastener (34) is threaded onto the insulating post (31); The contact post (36) is slidably sleeved on the connecting end (32).

3. A DC protection device with leakage current detection according to claim 2, characterized in that: The connecting end (32) is located inside the contact post (36) and a plurality of pressing balls (35) are arranged on the circumference of one end side wall. A spring is provided between the plurality of pressing balls (35) and the connecting end (32), and a pressing spring (37) is provided between the connecting end (32) and the contact post (36).

4. A DC protection device with leakage current detection according to claim 1, characterized in that: The end of the drive column (573) away from the iron column (57) is threadedly connected to the switch (6). A reset spring (575) is provided between the drive column (573) and the housing (1), and the reset spring (575) is sleeved on the outer wall of the switch (6).

5. A DC protection device with leakage current detection according to claim 1, characterized in that: The inner circumference of the opening and closing ring (53) is provided with four rotating grooves (531) and four resetting grooves (532). The four rotating grooves (531) are all arranged at an angle, and the four resetting grooves (532) are all arranged vertically. The four rotating grooves (531) and the four resetting grooves (532) together constitute the driving groove. The pushing column (574) is slidably arranged in the driving groove.

6. A DC protection device with leakage current detection according to claim 5, characterized in that: A first step (533) is provided at the top junction of the rotating groove (531) and the reset groove (532), and a second step (534) is provided at the bottom junction of the rotating groove (531) and the reset groove (532). The height of the first step (533) is lower than the height of the second step (534).

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