Miniature residual-current circuit breaker
By designing a small leakage circuit breaker, using springs and push rods to achieve changes in the position of the leakage indicator column, the complex structure and high cost in the existing technology are solved, maintenance efficiency and operating reliability are improved, and cost reduction and safety improvement are achieved.
Patent Information
- Application Number
- CN202420937390.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-04-30
AI Technical Summary
The existing small leakage circuit breakers have complex structures, high manufacturing and use costs, and pose safety risks.
A small leakage circuit breaker was designed, using springs and push rods to change the position of the leakage indicator column during leakage failure. By observing the position of the leakage indicator column, the cause of the fault is quickly judged. The structure is simple, the cost is low, the action is reliable, and the leakage is tripped. The device and current transformer are reasonably arranged inside the circuit breaker, and the length and width are not increased.
It improves equipment maintenance efficiency, reduces manufacturing and use costs, improves the operating reliability of the circuit breaker, and has a compact internal structure, stable and reliable.
Smart Images
Figure CN222355057U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of switches and relates to a small leakage circuit breaker, and more specifically, in particular to a small leakage circuit breaker used in a low-voltage power system. Background Art
[0002] Small leakage circuit breakers are widely used in industrial, commercial, residential and other fields to protect people from indirect contact, as well as overload and short circuit protection of lines in buildings and similar places. At present, 2P small leakage circuit breakers usually use 2P switches to assemble leakage accessories, or lengthen the original 2P circuit breaker to increase the leakage function; its structure is complex, and the left and right widths or total length of the circuit breaker are lengthened. During use, the distribution box also needs to have sufficient installation space, which invisibly increases the manufacturing and use costs of the leakage circuit breaker.
[0003] Therefore, it is necessary to propose a small leakage circuit breaker to solve the above problems. Utility Model Content
[0004] The utility model aims to provide a small leakage circuit breaker to solve the problems of the circuit breaker in the prior art, such as complex structure, high manufacturing and use costs, and potential safety hazards in operation.
[0005] To achieve the above object, the utility model provides the following solution: a small leakage circuit breaker, comprising a circuit breaker body and a leakage protection mechanism installed on one side of the circuit breaker body, the leakage protection mechanism comprising:
[0006] A leakage indication hole, which passes through a shell of one side of the leakage protection mechanism;
[0007] A leakage detection control circuit board, used for detecting leakage current of the circuit breaker, wherein the leakage detection control circuit board is connected to a driving component, and when the leakage detection control circuit board detects leakage current, the driving component is energized;
[0008] A leakage indicator column elastically slides inside the leakage protection mechanism along its length direction, one end of which faces the leakage indicator hole and the other end is bent to one side to form a leakage indicator column hook;
[0009] A lock buckle is elastically rotatably connected in the leakage protection mechanism, one end of the lock buckle has a lock buckle hook matched with the leakage indicator column hook, and the other end of the lock buckle is abutted against a push rod on a side away from the leakage indicator column hook, the push rod slides linearly in the leakage protection mechanism, and the driving member drives the push rod to reciprocate between a first position and a second position;
[0010] When the push rod is in the first position, the lock hook is connected with the leakage indicator column hook;
[0011] When the push rod is in the second position, the lock hook is separated from the leakage indicator column hook.
[0012] Preferably, the push rod is made of magnetic metal, and the driving component is an electromagnet. When the leakage detection control circuit board detects leakage current, the electromagnet is energized, and the electromagnet generates a magnetic attraction force to adsorb the push rod.
[0013] Preferably, two leakage indication guide blocks are protruded from the inner side of the leakage protection mechanism, and a leakage indication guide groove for accommodating the leakage indication column to slide freely is formed between the two leakage indication guide blocks.
[0014] Preferably, the middle two sides of the leakage indicator column are raised with convex steps, the lower half of the leakage indicator column is sleeved with a first spring, one end of the first spring abuts under the convex step, and the other end abuts on the two leakage indicator guide blocks.
[0015] Preferably, a boss limiter is provided near the upper end of the leakage indication column, and the boss limiter forms an axial limit for the leakage indication column.
[0016] Preferably, a positioning hole is opened in the middle of the lock buckle, a positioning shaft axially matched with the positioning block is provided on the inner side of the leakage protection mechanism, and a torsion spring is connected between the lock buckle and the positioning shaft.
[0017] Preferably, a side of the push rod facing away from the driving member is elastically connected to an inner shell of the leakage protection mechanism.
[0018] Preferably, a push rod boss is provided on the side of the push rod facing away from the driving member, and an inner shell of the leakage protection mechanism is provided with a body boss corresponding to the push rod boss, and a second spring is connected between the push rod boss and the body boss.
[0019] Preferably, the outer end surface of the locking hook is a smooth arc surface.
[0020] Preferably, an arc-isolating wall is provided in the circuit breaker body for isolating the leakage detection control circuit board from the arc.
[0021] The utility model discloses the following technical effects:
[0022] The utility model provides a small leakage circuit breaker, which uses a spring and a push rod to change the position of the leakage indicator column when a leakage fault occurs. By observing the position of the leakage indicator column, it is possible to quickly determine whether the cause of the circuit breaker tripping is a leakage fault. The circuit breaker can not only improve the equipment maintenance efficiency, but also has the advantages of simple structure, low cost, reliable operation, etc. In addition, the space of the shell is fully utilized, and the leakage release device and the current transformer are reasonably arranged inside the circuit breaker, without increasing the length and width of the circuit breaker, and the internal structure is compact, stable and reliable; it can solve the problems in the prior art, reduce the manufacturing and use costs of the circuit breaker, and improve its operating reliability. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 This is an overall structural diagram of a circuit breaker according to an embodiment of the utility model;
[0025] Figure 2 This is a schematic diagram of the structure of the leakage body in the embodiment of the utility model;
[0026] Figure 3 for Figure 2 A partial enlarged view of the middle A;
[0027] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;
[0028] Figure 5 This is a schematic diagram of the structure of the leakage indicator column in the embodiment of the utility model;
[0029] Figure 6 This is a schematic diagram of the structure of the lock in the embodiment of the utility model;
[0030] Figure 7 It is a schematic diagram of the structure of the push rod in the embodiment of the utility model.
[0031] Among them, 1. circuit breaker body; 2. leakage protection mechanism; 3. leakage indicator column; 31. boss limit; 32. convex step; 33. leakage indicator column hook; 4. first spring; 5. lock; 51. positioning hole; 52. lock hook; 53. groove; 6. push rod; 61. push rod boss; 7. second spring; 8. electromagnet; 9. leakage detection control circuit board; 10. leakage indication hole; 11. leakage indication guide block; 12. push rod guide groove; 13. torsion spring; 14. body boss; 15. arc isolation wall. DETAILED DESCRIPTION
[0032] 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.
[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0034] Reference Figure 1 As shown, the utility model provides a small leakage circuit breaker, including a circuit breaker body 1 and a leakage protection mechanism 2 installed on one side of the circuit breaker body 1, the leakage protection mechanism 2 includes a leakage indicator column 3, a first spring 4, a lock 5, a push rod 6, a second spring 7, an electromagnet 8, and a leakage detection control circuit board 9.
[0035] Specifically, as shown in Figure Figure 1 and 2 As shown, a leakage indication hole 10 is provided on the housing of the leakage protection mechanism 2, and a leakage indication guide block 11 corresponding to the position of the leakage indication hole 10 is provided inside the leakage protection mechanism 2. Two leakage indication guide blocks 11 are provided, one on the left and one on the right, located on both sides of the leakage indication column 3. A leakage indication guide groove for accommodating the leakage indication column 3 to slide freely is formed between the two leakage indication guide blocks 11. The two leakage indication guide blocks 11 form guide limits from both sides of the leakage indication column 3, and the leakage indication column 3 slides The leakage indicator column 3 is movably installed in the leakage indication guide groove, and one end can extend out of the leakage protection mechanism 2 from the leakage indication hole 10. The leakage indication hole 10 and the leakage indication guide block 11 guide the movement of the leakage indication column 3. At the same time, the leakage indication hole 10 is also used to observe the position of the leakage indication column 3; a boss limit 31 is provided at the upper end of the leakage indication column 3, and a convex step 32 is provided in the middle for installing the first spring 4. A leakage indication column hook 33 is provided at one end of the leakage indication column 3 located inside the leakage protection mechanism 2, which is used to clamp the lock buckle 5.
[0036] When the push rod 6 is in the first position, the lock hook 52 is hooked and connected with the leakage indicator column hook 33;
[0037] When the push rod 6 is in the second position, the lock hook 52 is separated from the leakage indicator column hook 33 .
[0038] In the above embodiment, the leakage indication column 3 can slide along the leakage indication hole 10 and the leakage indication guide block 11 under the action of external force.
[0039] In the above embodiment, the structure of the lock buckle 5 is as follows: Figure 6 As shown, Figure 6 (a) is a front view of the lock 5. Figure 6 (b) is a back view of the lock buckle 5; the lock buckle hook 52 at one end of the lock buckle 5 can be inserted into the leakage indicator column hook 33 at the end of the leakage indicator column 3, so that the leakage indicator column 3 cannot move to the outside of the leakage protection mechanism 2, and the other end is in contact with the push rod 6. When the leakage indicator column hook 3 is detached from the lock buckle 5, one end of the leakage indicator column 3 is exposed from the leakage indication hole 10 on the outer shell of the leakage protection mechanism 2.
[0040] In the above embodiment, the outer end surface of the lock hook 52 is a smooth arc surface. When the lock hook 52 is disengaged from the leakage indicator column hook 33, the leakage indicator column hook 33 is ejected toward the leakage indicator hole 10 by the elastic force of the first spring 4. At this time, when resetting is required, the leakage indicator column 3 is pressed, and the outer end surface of the leakage indicator column hook 33 contacts the outer end surface of the lock hook 52. Since the outer end surface of the lock hook 52 is an arc surface, the leakage indicator column hook 33 can be easily inserted into the inner side of the lock hook 52 to complete the hook connection and achieve resetting.
[0041] In the above embodiment, the lock buckle 5 is provided with a positioning hole 51 for the positioning shaft to pass through, and the bottom surface is provided with a groove 53 for installing the torsion spring 13. The torsion force of the torsion spring 13 makes the lock buckle tend to rotate clockwise.
[0042] In the above embodiment, the structure of the push rod 6 is as follows: Figure 7 As shown, Figure 7 (a) is a front view of the push rod 6, Figure 7 (b) is a left view of the push rod 6; the push rod 6 is installed inside the leakage protection mechanism 2 and slides in the push rod guide groove 12 under the action of the second spring 7. A push rod boss 61 is provided on one side of one end of the push rod, which is connected to the main body boss 14 in the leakage protection mechanism 2 by the second spring 7, and the other side is connected to the electromagnet 8, and the other end is in contact with the lock 5.
[0043] In the above embodiment, the leakage indication guide block 11 can prevent the leakage indication column 3 from deflecting, thereby improving the reliability of the movement of the leakage indication device.
[0044] In the above embodiment, the push rod 6 can slide in the push rod guide groove 12 under the thrust of the second spring 7. The push rod guide groove 12 can prevent the push rod 6 from deflecting, thereby improving the reliability of the movement of the push rod device.
[0045] In the above embodiment, the arc isolation wall 15 is used to protect the leakage detection control circuit board 9 from being damaged by the arc.
[0046] In the above embodiment, the function of the electromagnet 8 is to drive the electromagnet 8 to operate and disconnect the circuit breaker when the leakage detection control circuit board 9 detects the existence of leakage current in the circuit.
[0047] In the above embodiment, the leakage detection control circuit board 9 is used to detect whether there is leakage in the circuit.
[0048] The working principle of the embodiment of the utility model:
[0049] Under normal circumstances, the lock hook 52 at the end of the lock buckle 5 is inserted into the leakage indicator column hook 33 at one end of the leakage indicator column 3. When a leakage fault occurs in the circuit breaker, the electromagnet 8 moves to the right under the drive of the leakage detection control circuit board 9, and the push rod 6 slides to the right along the push rod guide groove 12 under the thrust of the second spring 7. The other end of the push rod pushes the lock, overcomes the torsion spring force at the bottom of the lock buckle 5, and makes the lock buckle 5 rotate counterclockwise around the axis, so that the lock hook 52 of the lock buckle 5 is separated from the leakage indicator column hook 33 at the end of the leakage indicator column 3. Then, the leakage indicator column 3 moves toward the outside of the leakage protection mechanism 2 along the leakage indication hole 10 and the leakage indication guide block 11 under the elastic force of the first spring 4 until the leakage indicator column 3 moves to the position of the boss limit 31 and the leakage indication hole 10 of the leakage protection mechanism 2. At this time, it is possible to judge whether the cause of the circuit breaker tripping is a leakage fault by inspecting the position of the leakage indicator column 3. After the fault is eliminated, the leakage indicator column 3 only needs to be pressed down, the lock hook 52 is locked into the leakage indicator column hook 33, and the push rod 6 is automatically reset under the action of the reset spring of the electromagnet 8 and the lock torsion spring 13, and the circuit breaker can be used again.
[0050] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.
[0051] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0052] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.
Claims
1. A small leakage circuit breaker, characterized in that: It comprises a circuit breaker body (1) and a leakage protection mechanism (2) installed on one side of the circuit breaker body (1), wherein the leakage protection mechanism (2) comprises: A leakage indication hole (10) passing through a housing on one side of the leakage protection mechanism (2); A leakage detection control circuit board (9) is used to detect leakage current of a circuit breaker, the leakage detection control circuit board (9) being connected to a driving component, and when the leakage detection control circuit board (9) detects leakage current, power is supplied to the driving component; A leakage indicator column (3) elastically slides inside the leakage protection mechanism (2) along its length direction, one end of which faces the leakage indicator hole (10) and the other end of which is bent to one side and has a leakage indicator column hook (33); A lock buckle (5) is elastically rotatably connected in the leakage protection mechanism (2), one end of the lock buckle (5) has a lock buckle hook (52) that cooperates with the leakage indication column hook (33), and the other end of the lock buckle (5) is abutted against a push rod (6) on a side away from the leakage indication column hook (33), the push rod (6) slides linearly in the leakage protection mechanism (2), and the driving member drives the push rod (6) to reciprocate between a first position and a second position; When the push rod (6) is in the first position, the lock hook (52) is hooked and connected with the leakage indicator column hook (33); When the push rod (6) is in the second position, the lock hook (52) is separated from the leakage indicator column hook (33).
2. The miniature residual current circuit breaker according to claim 1, characterized in that: The push rod (6) is made of a magnetic metal material, and the driving component is an electromagnet (8). When the leakage detection control circuit board (9) detects a leakage current, the electromagnet (8) is energized, and the electromagnet (8) generates a magnetic attraction force that attracts the push rod (6).
3. The miniature residual current circuit breaker according to claim 1, characterized in that: Two leakage indication guide blocks (11) are protruded from the inner side of the leakage protection mechanism (2), and a leakage indication guide groove for accommodating the leakage indication column (3) to slide freely is formed between the two leakage indication guide blocks (11).
4. The miniature residual current circuit breaker according to claim 3, characterized in that: The middle two sides of the leakage indication column (3) are protruded with convex steps (32), the lower half of the leakage indication column (3) is sleeved with a first spring (4), one end of the first spring (4) abuts below the convex step (32), and the other end abuts on the two leakage indication guide blocks (11).
5. The miniature residual current circuit breaker according to claim 4, characterized in that: A boss limiter (31) is provided near the upper end of the leakage indication column (3), and the boss limiter (31) forms an axial limit for the leakage indication column (3).
6. The miniature residual current circuit breaker according to claim 1, characterized in that: A positioning hole (51) is provided in the middle of the lock buckle (5), a positioning shaft axially matched with the positioning hole (51) is provided on the inner side of the leakage protection mechanism (2), and a torsion spring (13) is connected between the lock buckle (5) and the positioning shaft.
7. The miniature residual current circuit breaker according to claim 1, characterized in that: The side of the push rod (6) facing away from the driving member is elastically connected to the inner shell of the leakage protection mechanism (2).
8. The miniature residual current circuit breaker according to claim 7, characterized in that: A push rod boss (61) is provided on a side of the push rod (6) facing away from the driving member, an inner shell of the leakage protection mechanism (2) is provided with a body boss (14) corresponding to the push rod boss (61), and a second spring (7) is connected between the push rod boss (61) and the body boss (14).
9. The miniature residual current circuit breaker according to claim 1, characterized in that: The outer end surface of the locking hook (52) is a smooth arc surface.
10. The miniature residual current circuit breaker according to claim 1, characterized in that: An arc-isolating wall (15) is provided in the circuit breaker body (1) for isolating the leakage detection control circuit board (9) from the arc.