A protective device for MCB circuit breaker terminal blocks

Abstract

The present invention relates to an MCB circuit breaker terminal protection device, comprising a base (1), a cover (2), a rotating base (3) and two protective covers (4), wherein the base (1) is a round tube structure and two fulcrum pins (12) are symmetrically arranged on its end surface, the rotating base (3) is a round cover structure and two transmission pins (31) are symmetrically arranged on the inner surface of its end surface, the rotating base (3) is placed in the cover (2) and the front and rear end surfaces of the cover (2) and the end surface of the rotating base (3) are provided with round through holes, the round through hole on the rear end surface of the cover (2) is clamped on the base (1), the upper and lower surfaces of each protective cover (4) are correspondingly provided with a fixing hole (41) and a limiting groove (42), the fulcrum pin (11) and the transmission pin (31) are respectively inserted into the limiting groove (42) and the fixing hole (41) of the protective cover (4). Compared with the prior art, the present invention has the advantages of simple operation and high protection level.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breakers, and in particular to a protective device for MCB circuit breaker wiring terminals. Background Art

[0002] MCB (Micro Circuit Breaker / Miniature Circuit Breaker) circuit breaker is a miniature circuit breaker, which is the most widely used terminal protection device in the terminal distribution device of building electrical equipment. It has the characteristics of advanced structure, reliable performance, strong breaking capacity, beautiful and compact appearance, etc. It is used for overload and short-circuit protection of lighting, distribution lines and equipment in buildings such as office buildings and residential buildings, and can also be used for switching and converting lines. The shell of the current general MCB circuit breaker consists of a bottom and a cover. Due to factors such as product structure, assembly process and mold structure, it is designed into two parts. The assembly split line is in the middle, and the wiring terminal is located between the cover and the bottom. At this time, the wiring terminal carrying the incoming and outgoing lines has the following three disadvantages:

[0003] First, when wiring, the splicing wires at the screws will be affected by torque, which will cause tension on the hole wall and increase the gap. Especially when using impact electric or pneumatic screwdrivers, the shell will exceed its bearing capacity and produce irreparable plastic deformation, affecting the appearance;

[0004] Second, because the wiring screw holes are open, the protection level is only IP20. In order to improve the IP protection level, a cover is generally added to the wiring terminal, but the cover is separated from the shell, the cover is easy to fall off and inconvenient to open;

[0005] Third, when the cover and the base are assembled and riveted, there will be an assembly line in the middle of the shell. The assembly line may be very obvious due to processing accuracy, molds, shrinkage of plastic parts, etc., affecting the appearance and thus affecting the customer's first perception. Summary of the invention

[0006] The purpose of the present invention is to provide an MCB circuit breaker terminal protection device in order to overcome the defects of the above-mentioned prior art, so as to make the front splicing wires of the terminal invisible, improve the wiring capacity and protection level.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A protective device for MCB circuit breaker terminals, comprising a base, a cover, a rotating base and two protective covers, wherein the base is a round tube structure with an inwardly concave side wall and is coaxially arranged at a round hole of an MCB circuit breaker terminal, one end of the base is fixedly connected to the MCB circuit breaker terminal, and two fulcrum pins are symmetrically arranged on the annular surface of the other end, the rotating base is a round cover structure and two transmission pins are symmetrically arranged on the inner surface of the round cover, the two protective covers are completely identical and the upper and lower surfaces of each protective cover are correspondingly provided with fixing holes and limit grooves, and the cover is The cubic box body structure has a circular through hole coaxial with the base on its front end face, rear end face and the end face of the rotating base. The diameter of the circular through hole on the rear end face is smaller than the diameter of the end face of the base and is clamped in the recessed part of the side wall of the base, so that the cover is tightly connected to the base to prevent the rotating base and the two protective covers from loosening and causing unsealing and falling off. The two fulcrum pins and the two transmission pins are respectively inserted into the limiting grooves and fixing holes of the two protective covers. The positions of the two protective covers are centrally symmetrical. The two protective covers are in sealing contact and completely cover the circular through hole on the end face of the rotating base.

[0009] Furthermore, the thickness of the protective cover is greater than the length of the fulcrum pin, and the depth of the limit groove is less than the thickness of the protective cover. When the rotating base is twisted, the transmission pin on the rotating base drives the two protective covers to rotate, and the limit groove on the protective cover slides relative to the fulcrum pin. When the fulcrum pin slides to the extreme positions at both ends of the limit groove, it cannot continue to slide. At this time, the fulcrum pin serves as a lever fulcrum, and the transmission pin continues to rotate so that the other end of the protective cover continues to move to the maximum position. The two protective covers have a large range of activities and can be completely closed and opened. They have good sealing and are easy to operate. The side of the limit groove is an irregular arc structure connected by multiple cross-sections, and the cross-sections have inverted R angles at the connection between the cross-sections, so that the fulcrum pin will not slide arbitrarily on the limit groove and will not get stuck, ensuring that the two protective covers can be tightly closed and flexibly opened and closed. The depth of the limit groove is greater than half the thickness of the protective cover.

[0010] Furthermore, the upper surface of the end surface of the rotating base is flush with the upper surface of the front end surface of the cover, thereby ensuring the sealing performance of the device.

[0011] Furthermore, a cross groove is provided on the upper surface of the round cover of the rotating base for twisting the rotating base, and the symmetry center of the cross groove coincides with the circular through hole on the round cover. The opening and closing of the two protective covers are achieved by rotating the cross groove clockwise and counterclockwise. The edges of the two protective covers for sealing contact are S-shaped, which is conducive to the close contact of the two protective covers, reduces friction loss, has a large opening angle, saves space, and improves the sealing and life of the device.

[0012] Furthermore, the side of the rotating base is symmetrically provided with two penetrating slide grooves, and the height of the slide grooves is not less than the thickness of the protective cover. When the protective cover rotates, it can extend out of the rotating base through the slide grooves to increase the maximum rotation angle of the protective cover, while ensuring that the protective cover remains horizontal and increases stability.

[0013] Furthermore, the cover is a hollow cubic box body and its top cover and bottom cover are provided with identical and coaxial circular through holes. One side of the cover is open and a baffle is extended outward from the other side opposite to the side. The baffle is used to shield the assembly separation and combination line of the MCB circuit breaker. The circular through hole on the bottom cover of the cover is sleeved on the base, which can hold the base tightly to prevent the assembly line on the base from cracking.

[0014] Two long strip blocks are provided inside the cover, and the length direction of the blocks is perpendicular to the side of the cover opening. The side of the blocks in contact with the rotating base protrudes outward or is recessed inward, and the corresponding positions of the side of the rotating base in contact with the blocks are correspondingly recessed inward or protruded outward. The rotating base is inserted into the cover from one side of the opening of the cover, and the two blocks clamp the two sides of the rotating base.

[0015] Furthermore, a pair of inserts are symmetrically provided on the lower surface of the bottom cover of the cover for inserting into the slots on the circuit breaker housing, and can simultaneously hold the upper and lower covers of the MCB circuit breaker tightly, withstand the torque generated when rotating the screws at the terminal, and ensure that the splicing line does not crack.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention adopts a base, a cover, a rotating base and a protective cover to form a terminal protection device. The base and the rotating base are respectively provided with a fulcrum latch and a transmission latch. The cover is a cubic box structure and the rotating base is placed in the cover. The front and rear end faces of the cover and the end face of the rotating base are provided with circular through holes coaxial with the base. The rear end face of the cover is sleeved in the recessed part of the side wall of the base through the circular through hole. The cover can tighten the base to achieve the overall combination and sealing of the entire device, and also avoid the cracking of the splicing line caused by the torque of the screw, thereby improving the wiring capacity. At the same time, the upper and lower surfaces of each protective cover are correspondingly provided with a fixing hole and a limiting groove. The fulcrum latch and the transmission latch are respectively inserted into the limiting groove and the fixing hole of the protective cover. Through the lever principle and the relative movement of the fulcrum latch on the limiting groove, the rotation range of the protective cover is expanded, and the full opening and closing of the protective cover is achieved. The device has a high protection level and does not need to be disassembled, and is easy to operate.

[0018] (2) The upper surface of the end surface of the rotating base of the present invention is flush with the upper surface of the front end surface of the cover, which ensures the sealing of the device and has a high protection level. At the same time, a cross groove is opened on the end surface of the rotating base to facilitate twisting of the rotating base and easy operation;

[0019] (3) The present invention has two symmetrical sliding grooves penetrating the side wall of the rotating base. When the protective cover rotates, it can extend out of the rotating base through the sliding grooves, thereby increasing the maximum rotation angle of the protective cover and achieving full opening of the protective cover. At the same time, it ensures that the protective cover remains horizontal and increases stability.

[0020] (4) The present invention is provided with two long strip-shaped clamping blocks inside the cover for clamping the side of the rotating base. At the same time, the side of the clamping block in contact with the rotating base is convex outward or concave inward, and the corresponding position of the side of the rotating base in contact with the clamping block is correspondingly concave inward or convex outward, so that the upper and lower positions of the rotating base are fixed, and the device has good stability. One side of the cover is open, and the length direction of the clamping block is perpendicular to the side, which is convenient for inserting the rotating base into the cover. In addition, a baffle is extended outward from the other side opposite to the open side, which can cover the splicing line and is more beautiful.

[0021] (5) The present invention provides a pair of inserts symmetrically on the outer surface of the rear end face of the cover, which can further fix the cover and hold the upper and lower covers of the MCB circuit breaker tightly to avoid cracking of the splicing line. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the exploded diagram of the protective device structure of the MCB circuit breaker terminal;

[0023] Figure 2 for Figure 1 A magnified view of the wiring terminals;

[0024] Figure 3 is a schematic diagram of the structure of the base;

[0025] Figure 4 is a schematic diagram of the structure of the cover;

[0026] Figure 5 It is a schematic diagram of the bottom structure of the rotating base;

[0027] Figure 6 It is a schematic diagram of the top structure of the rotating base;

[0028] Figure 7 is a schematic diagram of the top structure of the protective cover;

[0029] Figure 8 is a schematic diagram of the bottom structure of the protective cover;

[0030] Fig. 9 Partial assembly diagram of the present invention

[0031] Fig.10 It is the overall assembly diagram of the present invention;

[0032] Fig.11 It is a cross-sectional view along the XY direction of the present invention;

[0033] Fig.12 It is a cross-sectional view in the Z direction of the present invention;

[0034] Description of the numbers in the figure:

[0035] 1. Base, 2. Cover, 3. Rotating base, 4. Protective cover, 11. Fulcrum latch, 21. Block, 22. Insert, 23. Rear end face, 24. Front end face, 31. Transmission latch, 32. Cross slot, 41. Fixing hole, 42. Limiting slot. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0037] A MCB circuit breaker terminal protection device, such as Figure 1 and Figure 2 , used for protecting the connection terminals of the MCB circuit breaker, comprising a base 1, a cover 2, a rotating base 3 and two protective covers 4.

[0038] like Figure 3 The base 1 is a circular tube structure with an inwardly recessed outer wall and is coaxially arranged at the circular hole of the wiring terminal of the MCB circuit breaker. Two fulcrum pins 11 are symmetrically arranged on the annular surface of the end face of the base 1.

[0039] like Figure 5 and Figure 6 The rotating base 3 is a round cover structure and two transmission pins 31 are symmetrically arranged on the lower surface of its end surface. A circular through hole and a cross groove 32 coaxial with the circular through hole are opened on the upper surface of the end surface of the rotating base 3. The rotating base 3 is twisted by rotating the cross groove 32. Two through-slots are symmetrically opened on the side of the rotating base 3 and the height of the slot is not less than the thickness of the protective cover 4. When the protective cover 4 rotates, it can extend out of the rotating base through the slot. Fig. 9 , in order to increase the maximum rotation angle of the protective cover, while ensuring that the protective cover remains level and increases stability.

[0040] The cover 2 is a cubic box structure and has circular through holes on its front end face 24 and rear end face 23 which are coaxial with the circular through holes on the rotating base 3. The two protective covers 4 are in sealing contact and completely cover the circular through holes on the top cover of the rotating base 3. The diameter of the circular through hole on the rear end face 23 is equal to the maximum diameter of the end face of the rain base 1.

[0041] like Figure 4The cover 2 is a hollow cubic box body, and the top cover and the bottom cover thereof are provided with the same and coaxial circular through holes. One side of the cubic box body is open, and a baffle extends outward from the other side opposite to the side. The baffle can shield the assembly separation and combination line of the MCB circuit breaker, which is safer and more beautiful. The circular through hole on the bottom cover of the cover 2 is clamped in the concave part of the side wall of the base 1, which can hold the base 1 tightly and prevent the assembly line on the base 1 from cracking;

[0042] Two long strip blocks 21 are provided inside the cover 2, and the sides of the blocks 21 protrude outward or are recessed inward correspondingly. The rotating base 3 is inserted into the cover 2 from the opening side of the cover 2, and the two blocks clamp the two sides of the rotating base 3; a pair of inserting pieces 22 are symmetrically provided on the lower surface of the bottom cover of the cover 2, and corresponding slots are provided on the MCB circuit breaker housing. The inserting pieces 22 are inserted into the slots on the relay housing, and can hold the upper and lower covers of the circuit breaker housing tightly.

[0043] like Figure 7 and Figure 8 The two protective covers 4 are exactly the same and the upper and lower surfaces of each protective cover 4 are correspondingly provided with a fixing hole 41 and a limiting groove 42. The two fulcrum pins 11 and the two transmission pins 31 are respectively inserted into the limiting grooves 42 and the fixing holes 41 of the two protective covers 4; the depth of the limiting groove 42 is less than the thickness of the protective cover 4, the limiting groove 42 is arc-shaped, the thickness of the protective cover 4 is greater than the length of the fulcrum pin 11, and the edges of the two protective covers 4 that are sealed and contacted are S-shaped, which is conducive to the two protective covers 4 to fully contact and seal the circular through holes on the top cover of the cover 2.

[0044] During installation, first insert the rotating base 3 into the cover 2 from the opening side of the cover 2, then align the fixing holes 41 and the limiting grooves 42 of the two protective covers with the fulcrum latch 11 on the base 1 and the driving latch 31 on the rotating base 3, and then insert the insert 22 of the cover 2 into the slot on the MCB circuit breaker housing. The installation is completed. Fig.10 , easy to operate;

[0045] like Fig.11 and 12 When opening and closing the protective cover 4, the cross slot 32 is twisted counterclockwise and clockwise respectively. The transmission pin 31 on the rotating base 3 drives one end of the two protective covers 4 to rotate, and the limit slot 42 on the protective cover 4 slides relative to the fulcrum pin 11. When the fulcrum pin 11 slides to the limit positions at both ends of the limit slot 42, it cannot continue to slide. At this time, the fulcrum pin 11 serves as a lever fulcrum, and the transmission pin 31 continues to rotate so that the other end of the protective cover 4 continues to move to the maximum position. The two protective covers have a large range of activities and can be completely closed and opened, with good sealing and easy operation.

[0046] This embodiment proposes an MCB circuit breaker terminal protection device, which makes the front splicing wire of the terminal invisible and has a beautiful appearance. At the same time, the torque is expected to be increased from 2.5N·m to 5N·m without cracking, thereby improving the wiring capacity and the protection level is increased from IP20 to IP40.

[0047] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A MCB circuit breaker terminal protection device, characterized in that: The invention comprises a base (1), a cover (2), a rotating base (3) and two protective covers (4), wherein the base (1) is a circular tube structure with a side wall concave inwardly and two fulcrum latches (11) are symmetrically arranged on its end surface, the rotating base (3) is a circular cover structure and two transmission latches (31) are symmetrically arranged on the inner surface of its end surface, the cover (2) is a cubic box structure, the rotating base (3) is placed in the cover (2) and the front and rear surfaces of the cover (2) are The end surface of the rotating base (3) is provided with a circular through hole coaxial with the base (1); the circular through hole on the rear end surface of the cover (2) is clamped on the base (1); the two protective covers (4) are completely identical and the upper and lower surfaces of each protective cover (4) are provided with a fixing hole (41) and a limiting groove (42) respectively; the two fulcrum pins (11) and the two transmission pins (31) are respectively inserted into the limiting grooves (42) and the fixing holes (41) of the two protective covers (4).

2. The MCB circuit breaker terminal protection device according to claim 1, characterized in that: A cross groove (32) for twisting the rotating base (3) is formed on the outer surface of the end face of the rotating base (3).

3. The MCB circuit breaker terminal protection device according to claim 1, characterized in that: The side wall of the rotating base (3) is symmetrically provided with two sliding grooves penetrating the side wall.

4. The MCB circuit breaker terminal protection device according to claim 1, characterized in that: Two long strip-shaped clamping blocks (21) for clamping the rotating base (3) are arranged inside the cover (2).

5. The MCB circuit breaker terminal protection device according to claim 4, characterized in that: The side surface of the clamping block (21) in contact with the rotating base (3) is convex outward or concave inward, and the corresponding position of the side surface of the rotating base (3) in contact with the clamping block (21) is concave inward or convex outward accordingly.

6. The MCB circuit breaker terminal protection device according to claim 4, characterized in that: The cover (2) has an opening on one side, and the length direction of the clamping block (21) is perpendicular to the side.

7. The MCB circuit breaker terminal protection device according to claim 6, characterized in that: A baffle plate extends outwardly from the other side surface opposite to the opening side surface of the cover (2).

8. The MCB circuit breaker terminal protection device according to claim 1, characterized in that: A pair of inserts (22) are symmetrically provided on the outer surface of the rear end face of the cover (2).

9. The MCB circuit breaker terminal protection device according to claim 1, characterized in that: The two protective covers (4) completely cover the circular through hole on the end surface of the rotating base (3) when in sealing contact.

10. The MCB circuit breaker terminal protection device according to claim 1, characterized in that: The side surface of the limiting groove (42) is an irregular arc-shaped structure in which a plurality of cross sections are connected, and the connection between the cross sections has an inverted R angle.

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