Residual-current circuit breaker

Abstract

The utility model relates to the technical field of circuit protection, and discloses a residual-current circuit breaker which comprises a shell, a groove is formed in the top end of the rear side in the shell, a rotating rod is rotationally connected in the groove, a shell cover is fixedly connected to the front side of the rotating rod, torsion springs are arranged on the left side and the right side of the outer wall of the rotating rod, and the torsion springs are connected with the shell cover. One end of the torsion spring is fixedly connected with one side of the interior of the groove, the other end of the torsion spring is fixedly connected with one side of the shell cover, the bottom of the shell cover is fixedly connected with a top rod, the inner side of the shell is fixedly connected with a placing plate, and the top end of the placing plate is fixedly connected with an extension spring. According to the utility model, the bolt is unscrewed, so that the limiting and fixing of the L-shaped plate can be relieved, and the extension spring releases the extruded force to drive the pressing plate to move upwards until the pressing plate is in contact with the normally-closed contact, and the embedded top cover does not need to be taken down to disconnect the circuit of the circuit breaker, so that the workload of workers can be reduced.

Description

Technical Field

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

[0002] A residual current circuit breaker is an electrical protection device, also known as a residual current circuit breaker. It is commonly used in residential, industrial and commercial buildings to detect leakage in the circuit and quickly cut off the circuit when leakage occurs to protect personal safety and prevent fire accidents.

[0003] The main working principle of the leakage circuit breaker is to detect the residual current in the circuit. When the current exceeds the preset threshold, the leakage circuit breaker will quickly cut off the circuit and prevent the current from continuing to flow, so as to reduce the risk of electric shock and fire hazards.

[0004] After searching, the Chinese patent announcement number is: CN203826310U, which discloses a leakage circuit breaker, whose structure includes an insulating frame and a circuit breaker assembly arranged in the frame, the frame includes a base, a lower cover covering the base and an upper cover fastened to the lower cover, the base is provided with at least two micro switches, the upper cover is provided with a micro button that can move along the axial direction, and the micro button conflicts with the micro switch. The utility model aims to provide a device with a simple structure, easy maintenance, convenient for power frequency withstand voltage test, and its internal circuit will not cause poor circuit contact due to the metal shrapnel used for testing. However, the device applies pressure to the button through the top cover embedded in the upper cover, so that the micro switch is in a closed state. When the circuit in the circuit breaker needs to be disconnected, the top cover can be removed. Since the top cover is embedded in the upper cover, it is more troublesome to remove the top cover, which brings a workload to the staff and cannot meet the needs of users. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a leakage circuit breaker, aiming to improve the problem that it is troublesome to remove the top cover of the leakage circuit breaker in the prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a leakage circuit breaker comprises a shell, a groove is opened at the top end of the inner rear side of the shell, a rotating rod is rotatably connected inside the groove, a shell cover is fixedly connected to the front side of the rotating rod, a torsion spring is arranged on the left and right sides of the outer wall of the rotating rod, one end of the torsion spring is fixedly connected to one side of the inner part of the groove, and the other end of the torsion spring is fixedly connected to one side of the shell cover, a top rod is fixedly connected to the bottom of the shell cover, a placing plate is fixedly connected to the inner side of the shell, a tension spring is fixedly connected to the top end of the placing plate, a pressure plate is fixedly connected to the top end of the tension spring, a normally closed contact is fixedly connected to the upper side of the inner front end of the shell, a normally open contact is fixedly connected to the lower side of the inner front end of the shell, an L-shaped plate is fixedly connected to the top front side of the shell cover, a bolt is threadedly connected to the front side of the L-shaped plate, and the rear end of the bolt passes through the L-shaped plate and the shell in sequence, and a clamping mechanism is arranged on the rear side of the shell.

[0007] Through the above technical solution, there is no need to remove the embedded top cover to disconnect the circuit of the circuit breaker, thereby reducing the workload of the staff and meeting the needs of the users.

[0008] As a further description of the above technical solution:

[0009] The clamping mechanism includes a fixed frame, which is fixedly connected to the rear side of the shell, and a plurality of partitions are equidistantly fixedly connected to the inner side of the fixed frame, one side of the partition and the right side of the inner side of the fixed frame are provided with open grooves, a screw rod is rotatably connected to the right side of the rear end of the fixed frame, the front end of the screw rod passes through the corresponding open groove, a movable block is threadedly connected to the outer side of the screw rod, and a fixed rod is fixedly connected to the left end of the movable block, and a plurality of splints are equidistantly arranged on the inner side of the fixed frame, and the left end of the fixed rod passes through the plurality of splints in sequence.

[0010] Through the above technical solution, multiple clamps can be driven to move at the same time to press and fix the circuit, which makes it relatively simple to fix the circuit, thereby improving the practicability of the device.

[0011] As a further description of the above technical solution:

[0012] A plurality of square grooves are equidistantly arranged on the front side of the shell, and the interiors of the plurality of square grooves are rotatably connected to the same push switch.

[0013] Through the above technical solution, the operation of the device can be conveniently controlled.

[0014] As a further description of the above technical solution:

[0015] The left and right sides of the shell are both fixedly connected with fixing plates, and the middle parts of the front sides of the two fixing plates are both provided with mounting holes.

[0016] Through the above technical solution, the housing can be conveniently fixed at the desired installation position.

[0017] As a further description of the above technical solution:

[0018] The clamping mechanism also includes holes, and a plurality of the holes are equidistantly arranged on the top of the fixing frame.

[0019] Through the above technical solution, the lines can be separated and enter the space separated by the partition, thereby preventing the lines from being entangled and affecting the normal progress of subsequent maintenance work.

[0020] As a further description of the above technical solution:

[0021] The clamping mechanism also includes a rubber pad, and a plurality of the rubber pads are respectively fixedly connected to the rear sides of the corresponding clamping plates.

[0022] Through the above technical solution, the friction between the clamp and the line can be further increased, so that it can be placed more stably.

[0023] As a further description of the above technical solution:

[0024] A limiting rod is arranged on the inner side of the tension spring, and the bottom end of the limiting rod is fixedly connected to the middle part of the top end of the placement plate.

[0025] The above technical solution can prevent the extension spring from shaking left and right when being squeezed.

[0026] As a further description of the above technical solution:

[0027] The movable block is slidably connected to the inside of the corresponding opening groove.

[0028] Through the above technical solution, the moving track of the movable block can be limited, so that the movable block can move more smoothly.

[0029] The utility model has the following beneficial effects:

[0030] 1. In the utility model, loosening the bolts can release the limit fixation of the L-shaped plate. At this time, the torsion spring will release the squeezed force and drive the shell cover to rebound to be perpendicular to the shell. At the same time, the tension spring will release the squeezed force and drive the pressure plate to move upward until it contacts the normally closed contact. At this time, the circuit in the circuit breaker can be disconnected, and there is no need to remove the embedded top cover to disconnect the circuit of the circuit breaker, thereby reducing the workload of the staff and meeting the needs of users.

[0031] 2. In the utility model, rotating the screw rod can drive the movable block to slide in the corresponding open groove. At this time, the fixed rod on the left side of the movable block will simultaneously drive multiple clamping plates to move to press and fix the line. Fixing the line is relatively simple, thereby improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A top view of a leakage circuit breaker proposed by the utility model;

[0033] Figure 2 A partial structural cross-sectional view of a leakage circuit breaker proposed by the utility model;

[0034] Figure 3 The utility model is a cross-sectional view of a fixed frame structure of a leakage circuit breaker.

[0035] Legend:

[0036] 1. Shell; 2. Clamping mechanism; 201. Fixed frame; 202. Partition; 203. Open slot; 204. Screw rod; 205. Movable block; 206. Fixed rod; 207. Clamp plate; 208. Rubber pad; 209. Hole; 3. Groove; 4. Rotating rod; 5. Shell cover; 6. Torsion spring; 7. Push rod; 8. Placement plate; 9. Tension spring; 10. Pressing plate; 11. Normally closed contact; 12. Normally open contact; 13. Limiting rod; 14. Mounting hole; 15. L-shaped plate; 16. Bolt; 17. Square slot; 18. Push switch; 19. Fixed plate. DETAILED DESCRIPTION

[0037] 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.

[0038] Reference Figure 1 and Figure 2, an embodiment provided by the utility model: a leakage circuit breaker comprises a shell 1, a groove 3 is provided at the top end of the inner rear side of the shell 1, a rotating rod 4 is rotatably connected inside the groove 3, a shell cover 5 is fixedly connected to the front side of the rotating rod 4, a torsion spring 6 is arranged on the left and right sides of the outer wall of the rotating rod 4, one end of the torsion spring 6 is fixedly connected to one side of the inner part of the groove 3, and the other end of the torsion spring 6 is fixedly connected to one side of the shell cover 5, a top rod 7 is fixedly connected to the bottom of the shell cover 5, a placing plate 8 is fixedly connected to the inner side of the shell 1, a tension spring 9 is fixedly connected to the top of the tension spring 9, a pressing plate 10 is fixedly connected to the upper side of the inner front end of the shell 1, a normally closed contact 11 is fixedly connected to the upper side of the inner front end of the shell 1, a normally open contact 12 is fixedly connected to the lower side of the inner front end of the shell 1, an L-shaped plate 15 is fixedly connected to the top front side of the shell cover 5, a bolt 16 is threadedly connected to the front side of the L-shaped plate 15, and the rear end of the bolt 16 passes through the L-shaped plate 15 and the shell 1 in sequence, and a clamping mechanism 2 is arranged on the rear side of the shell 1;

[0039] Specifically, when conducting a power frequency withstand voltage test, first loosening the bolt 16 can release the limit fixation of the L-shaped plate 15. Once the bolt 16 is loosened, the torsion spring 6 will immediately release the squeezed force and drive the shell cover 5 to rebound to a state perpendicular to the shell 1. This design not only ensures the stability of the structure, but also makes the operation process smoother. At the same time, the tension spring 9 will also release the squeezed force, thereby driving the pressure plate 10 to move upward. In the process of the pressure plate 10 moving upward, it will gradually approach the normally closed contact 11. When the pressure plate 10 contacts the normally closed contact 11, the circuit will be disconnected, thereby realizing the control of the leakage circuit breaker. During the entire operation process, there is no need to remove the embedded top cover. This means that the staff can complete the circuit disconnection work without disassembling the circuit breaker, which greatly improves the work efficiency. At the same time, this design also meets the needs of users, making the use of the leakage circuit breaker more convenient.

[0040] Reference Figure 1 and Figure 3 The clamping mechanism 2 includes a fixed frame 201, which is fixedly connected to the rear side of the shell 1. A plurality of partitions 202 are fixedly connected to the inner side of the fixed frame 201 at equal intervals. An open groove 203 is provided on one side of the partition 202 and the right side of the inner side of the fixed frame 201. A screw rod 204 is rotatably connected to the right side of the rear end of the fixed frame 201. The front end of the screw rod 204 penetrates the corresponding open groove 203. The outer side of the screw rod 204 is threadedly connected to a movable block 205. The left end of the movable block 205 is fixedly connected to a fixed rod 206. A plurality of clamping plates 207 are equidistantly arranged on the inner side of the fixed frame 201. The left end of the fixed rod 206 penetrates the plurality of clamping plates 207 in sequence. The movable block 205 is slidably connected to the corresponding inner side of the open groove 203. The clamping mechanism 2 also includes holes 209. The plurality of holes 209 are respectively and equidistantly provided on the top of the fixed frame 201.

[0041] Specifically, the external lines are first placed in the corresponding holes 209, and then the screw rod 204 is rotated. At this time, the movable block 205 starts to slide in the corresponding open groove 203. The sliding of the movable block 205 not only drives the movement of the fixed rod 206, but also realizes the pressing and fixing of the lines through the linkage between the fixed rod 206 and the multiple clamping plates 207, which can ensure that each line can be fully fixed. The whole fixing process is simple and fast, which greatly improves the practicality of the device.

[0042] Reference Figure 1 The front side of the housing 1 is provided with a plurality of square grooves 17 at equal intervals, and the same push switch 18 is rotatably connected inside the plurality of square grooves 17. The left and right sides of the housing 1 are fixedly connected with fixing plates 19, and the middle portions of the front sides of the two fixing plates 19 are provided with mounting holes 14;

[0043] Specifically, the operation of the device can be conveniently controlled by pushing the switch 18, and the provided mounting hole 14 can conveniently fix the housing 1 at a desired installation position.

[0044] Reference Figure 3 , the clamping mechanism 2 also includes a rubber pad 208, and a plurality of rubber pads 208 are respectively fixedly connected to the rear sides of the corresponding clamping plates 207;

[0045] Specifically, the rubber pad 208 can further increase the friction between the clamping plate 207 and the line, so that the line can be placed more stably.

[0046] Reference Figure 2 A limit rod 13 is provided on the inner side of the tension spring 9, and the bottom end of the limit rod 13 is fixedly connected to the middle part of the top end of the placement plate 8;

[0047] Specifically, the limiting rod 13 can prevent the tension spring 9 from shaking left and right when being squeezed, thereby preventing the stability of the device during operation.

[0048] Working principle: When using the leakage circuit breaker, close the shell cover 5 to make it parallel to the shell 1, and then tighten the bolts 16 to fix the shell cover 5. At this time, the top rod 7 will squeeze the pressure plate 10 to press the normally open contact 12, so that the leakage circuit breaker can work normally. When the leakage circuit breaker is subjected to the power frequency withstand voltage test, loosening the bolts 16 can release the limit fixation of the L-shaped plate 15. At this time, the torsion spring 6 will release the squeezed force and drive the shell cover 5 to rebound to be perpendicular to the shell 1. At the same time, the tension spring 9 will release the squeezed force and drive the pressure plate 10 to move upward until it contacts the normally closed contact. 11. At this time, the circuit in the circuit breaker can be disconnected, and there is no need to remove the embedded top cover to disconnect the circuit of the circuit breaker, thereby reducing the workload of the staff and meeting the needs of the user. Before using the device, the external lines are first placed in the corresponding holes 209, and then the screw rod 204 is rotated to drive the movable block 205 to slide in the corresponding opening groove 203. At this time, the fixing rod 206 on the left side of the movable block 205 will simultaneously drive the multiple clamping plates 207 to move and press and fix the line. It is relatively simple to fix the line, thereby improving the practicality of the device.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A residual current circuit breaker, comprising a housing (1), characterized in that: A groove (3) is provided at the top end of the inner rear side of the shell (1); a rotating rod (4) is rotatably connected to the inside of the groove (3); a shell cover (5) is fixedly connected to the front side of the rotating rod (4); torsion springs (6) are provided on the left and right sides of the outer wall of the rotating rod (4); one end of the torsion spring (6) is fixedly connected to one side of the inner side of the groove (3); the other end of the torsion spring (6) is fixedly connected to one side of the shell cover (5); a top rod (7) is fixedly connected to the bottom of the shell cover (5); a placement plate (8) is fixedly connected to the inner side of the shell (1); the placement plate (8) ) is fixedly connected to the top of a tension spring (9), the top of the tension spring (9) is fixedly connected to a pressure plate (10), the upper side of the inner front end of the shell (1) is fixedly connected to a normally closed contact (11), the lower side of the inner front end of the shell (1) is fixedly connected to a normally open contact (12), the top front side of the shell cover (5) is fixedly connected to an L-shaped plate (15), the front side of the L-shaped plate (15) is threadedly connected to a bolt (16), the rear end of the bolt (16) passes through the L-shaped plate (15) and the shell (1) in sequence, and the rear side of the shell (1) is provided with a clamping mechanism (2).

2. A leakage circuit breaker according to claim 1, characterized in that: The clamping mechanism (2) comprises a fixed frame (201), the fixed frame (201) being fixedly connected to the rear side of the shell (1), a plurality of partitions (202) being fixedly connected at equal intervals on the inner side of the fixed frame (201), an opening groove (203) being provided on one side of the partition (202) and the inner right side of the fixed frame (201), a screw rod (204) being rotatably connected to the right side of the rear end of the fixed frame (201), the front end of the screw rod (204) passing through the corresponding opening groove (203), a movable block (205) being threadedly connected to the outer side of the screw rod (204), the left end of the movable block (205) being fixedly connected to a fixed rod (206), a plurality of clamping plates (207) being arranged at equal intervals on the inner side of the fixed frame (201), and the left end of the fixed rod (206) passing through the plurality of clamping plates (207) in sequence.

3. A leakage circuit breaker according to claim 1, characterized in that: A plurality of square grooves (17) are equidistantly provided on the front side of the housing (1), and the interiors of the plurality of square grooves (17) are rotatably connected to the same push switch (18).

4. A leakage circuit breaker according to claim 1, characterized in that: The left and right sides of the housing (1) are both fixedly connected with fixing plates (19), and the middle parts of the front sides of the two fixing plates (19) are each provided with a mounting hole (14).

5. A leakage circuit breaker according to claim 2, characterized in that: The clamping mechanism (2) further comprises holes (209), and a plurality of the holes (209) are respectively and equidistantly arranged on the top of the fixing frame (201).

6. A leakage circuit breaker according to claim 2, characterized in that: The clamping mechanism (2) further comprises a rubber pad (208), wherein a plurality of the rubber pads (208) are respectively fixedly connected to the rear sides of corresponding clamping plates (207).

7. A leakage circuit breaker according to claim 1, characterized in that: A limiting rod (13) is arranged on the inner side of the tension spring (9), and the bottom end of the limiting rod (13) is fixedly connected to the middle part of the top end of the placement plate (8).

8. A leakage circuit breaker according to claim 2, characterized in that: The movable block (205) is slidably connected to the inside of the corresponding opening groove (203).

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