A power distribution base for a circuit breaker

Abstract

The application discloses a power distribution chassis of a circuit breaker, and belongs to the technical field of power distribution equipment. The power distribution chassis comprises a base and an upper cover. The base and the upper cover are made of high-insulation engineering plastic through an integral injection molding process. The base is provided with first elastic clamping feet, and the upper cover is provided with elastic clamping foot insertion grooves and elastic clamping foot support walls which are matched with the first elastic clamping feet. The first elastic clamping feet pass through the elastic clamping foot insertion grooves of the upper cover and are clamped on the elastic clamping foot support walls of the upper cover. The first elastic clamping feet are used for fixing the base and the upper cover of the power distribution chassis. The power distribution chassis is composed of a plastic base, a plastic upper cover, a separate electrical connecting plate and a fastening nut, has a simple structure, is convenient to assemble, and guarantees the safety of electrical installation.

Description

Technical Field

[0001] This invention relates to the field of power distribution equipment technology, and more specifically, to a power distribution chassis for a circuit breaker. Background Technology

[0002] Most plug-in circuit breakers commonly found on the market today use a one-piece structure made of metal material through a single stamping process for their matching distribution chassis (or distribution box).

[0003] While this type of structure possesses a certain degree of mechanical strength, it still exhibits the following significant shortcomings in practical applications: First, the integrated structure often results in a large overall space occupied by the circuit breaker after electrical installation, which is not conducive to the compact layout of equipment within a limited space; second, the fixed fit between the iron panel and electrical connection components is prone to loosening after vibration, temperature changes, or long-term use, leading to decreased electrical contact stability and affecting power supply reliability; furthermore, the metal material has certain limitations in terms of insulation protection, with relatively weak electrical isolation capabilities, which may pose safety hazards and are detrimental to safety assurance during operation and maintenance.

[0004] Therefore, a circuit breaker distribution chassis is proposed. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a circuit breaker distribution chassis that can improve safety.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A circuit breaker distribution chassis, comprising a base and a top cover; Both the base and the top cover are made of high-insulation engineering plastics using a one-piece injection molding process; The base is provided with a first elastic locking foot, and the top cover is provided with an elastic locking foot insertion slot and an elastic locking foot support wall that cooperate with the first elastic locking foot. The first elastic clip passes through the elastic clip insertion slot of the upper cover and is locked onto the elastic clip support wall of the upper cover. The first elastic clip is used to fix the base and the upper cover of the power distribution chassis. The first elastic locking foot has a first mounting hole with its bottom end communicating with the outside. An elastic element is fixedly installed in the first mounting hole. The ratio of the diameter of the first mounting hole to the diameter of the elastic element is 1.2-1.4. The bottom end of the elastic element extends outside the first mounting hole, the distance between the bottom wall of the elastic element and the bottom wall of the first mounting hole is 3-5mm, and the elastic element is provided with an expansion mechanism for expanding the elastic element.

[0008] The expansion mechanism includes a shape memory alloy wire embedded in an elastic element. A heat-conducting rod with an end communicating with the outside is uniformly embedded on the elastic element, and the other end of the heat-conducting rod is in contact with the side wall of the shape memory alloy wire. The bottom wall of the elastic element is in contact with the surface of the elastic foot support wall.

[0009] When the circuit is turned on, the current flowing through the connection points generates Joule heat. This heat is continuously dissipated outwards, causing the air temperature around the base and top cover to gradually rise. At this time, the heat-conducting rods installed in the structure quickly conduct the accumulated heat to the shape memory alloy wires, causing the shape memory alloy wires to stretch due to heat.

[0010] When the shape memory alloy wire stretches, it causes the elastic element to expand and deform axially or radially. The outer surface of the expanded elastic element fits tightly against the surrounding elastic foot support walls, increasing the contact area and significantly improving the static friction and structural damping between them. Through the coupling of thermodynamics and structural mechanics, this effectively suppresses minor displacement or loosening tendencies of the top cover relative to the base, greatly reducing the probability of the top cover wobbling under external vibration or impact, thereby improving the overall rigidity and long-term stability of the connection between the top cover and the base.

[0011] The first elastic locking foot includes an elastic sheet and a barb, and the first mounting hole is opened on the bottom wall of the barb; At room temperature and in a cold state, relying on the structural elasticity of the first elastic locking foot, its end barb passes through the elastic locking foot insertion slot and forms a mechanical engagement with the elastic locking foot support wall. At this time, the locking foot itself provides basic tensile strength, ensuring the stability of the circuit breaker during transportation and in non-operating conditions.

[0012] When the system is put into operation and the temperature rises, the expansion mechanism activates, the volume of the elastic element increases, filling the installation gap and providing additional radial clamping force. This stage is mainly used to eliminate material fretting caused by temperature rise and to resist electromagnetic vibration during operation.

[0013] Furthermore, the base is provided with a distribution box mounting hole, a first positioning post, a mounting support surface, and a fixing base surface. The mounting hole and the first positioning post are both arranged on the same plane of the mounting support surface, and the two first positioning posts are symmetrically distributed on both sides of the mounting hole, forming a stable and reliable centering and positioning function.

[0014] The mounting support surface provides stable support for the distribution box, and together with the fixed base surface, it forms a complete mounting structure, thereby ensuring that the distribution box can be accurately and firmly installed in the predetermined position, achieving the dual requirements of electrical connection and mechanical fixation.

[0015] Furthermore, the base is provided with a bottom insulating plate, an external busbar mounting positioning groove, an external busbar mounting positioning post, and an external busbar mounting hole; The bottom insulating plate is made of highly insulating material, providing electrical isolation between the external busbar and all metal components, preventing leakage or short circuit risks, and ensuring operational safety. The external busbar mounting and positioning slot is a long, strip-shaped guide structure used for lateral limiting and pre-positioning of the busbar during initial installation. The corresponding external busbar mounting and positioning post provides a vertical positioning reference, ensuring alignment of the busbar holes with the mounting holes on the base. Finally, the busbar can be securely fastened to the base using standard fasteners through the external busbar mounting holes, achieving both mechanical fixation and electrical connection.

[0016] Furthermore, the base is provided with a first fixing foot of the circuit breaker, and the upper cover is provided with a circuit breaker fixing foot insertion groove that mates with the first fixing foot of the circuit breaker. During assembly, the first fixing foot of the circuit breaker on the base passes vertically upward through the circuit breaker fixing foot insertion slot on the upper cover, forming a through-type mechanical interlock structure. This provides installation guidance and radial limiting for the plug-in circuit breaker, restricting displacement and loosening of the circuit breaker due to vibration or electromagnetic force during energized operation.

[0017] This securely confines the circuit breaker within the installation space formed by the base and the top cover, significantly improving the circuit breaker's installation rigidity and vibration resistance, thereby ensuring the electrical connection reliability and operational safety during long-term operation.

[0018] Furthermore, a first insulating wall is provided on the base, and an insulating wall insertion groove that mates with the first insulating wall is provided on the top cover; The first insulating wall is inserted into the insulating wall insertion slot of the upper cover. The first insulating wall is used for positioning between multi-pole circuit breakers and increasing the electrical creepage distance between circuit breakers.

[0019] Furthermore, an independent electrical connection plate is fixedly installed inside the base, and the independent electrical connection plate is provided with conductive plugs, assembly positioning holes and busbar connection holes; The conductive plug is used for electrical connection with the circuit breaker socket, the mounting positioning hole is used for mounting and positioning the base, and the busbar connection hole is used for connecting the electrical lines of the external busbar.

[0020] Furthermore, the conductive insert is made of high-strength copper alloy material, thereby improving the electrical and thermal conductivity.

[0021] Furthermore, the top cover is provided with an embedded fastening nut, and the base is provided with a fixing block screw that mates with the embedded fastening nut; the embedded fastening nut is used for fastening connection with the corresponding fixing block screw.

[0022] Furthermore, the top cover is provided with a circuit breaker socket slot for inserting and installing a plug-in circuit breaker socket.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) This solution consists of a plastic base and top cover, an independent electrical connection plate, and fastening nuts. Its structure is simple and easy to assemble and install. The plastic base and top cover ensure the safety of electrical installation. The cooperation between the first independent electrical connection plate and the second independent electrical connection plate improves the stability of electrical connection and the ease of installation of circuit breaker.

[0024] (2) This solution solves the problem of loosening of the circuit breaker in the distribution box during transportation by tightening the nuts and corresponding fixing blocks, while ensuring the stability of the circuit breaker during operation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the base of the present invention; Figure 2 This is a schematic diagram of the structure of the upper cover of the present invention; Figure 3 This is a schematic diagram showing the positions of the fixing holes and positioning posts in this invention. Figure 4 This is a schematic diagram of the combined structure of the top cover and the base of the present invention; Figure 5 This is a schematic diagram of the combined structure of the external busbar mounting hole and the first fixing foot of the fuse according to the present invention; Figure 6 This is a schematic diagram showing the location of the circuit breaker socket slot of the present invention; Figure 7 This is a cross-sectional view of the first elastic locking foot of the present invention; Figure 8 This is a schematic cross-sectional view of the combined structure of the top cover and the base of the present invention; Figure 9 For the present invention Figure 8 A magnified structural diagram of point A in the middle.

[0026] Explanation of the labels in the diagram: 1. Base; 2. Top cover; 3. First elastic locking foot; 301. Elastic sheet; 302. Barb; 4. Elastic locking foot insertion slot; 5. Elastic locking foot support wall; 6. First mounting hole; 7. Elastic element; 8. Memory alloy wire; 9. Heat-conducting rod; 10. Fixing hole; 11. First positioning post; 12. Mounting support surface; 13. Fixing base surface; 14. Bottom insulating plate; 15. External busbar mounting positioning slot; 16. External busbar mounting positioning post; 17. External busbar mounting hole; 18. Circuit breaker first fixing foot; 19. Circuit breaker fixing foot insertion slot; 20. First insulating wall; 21. Insulating wall insertion slot; 22. Independent electrical connection plate; 23. Conductive plug plate; 24. Assembly positioning hole; 25. Busbar connection hole; 26. Embedded fastening nut; 27. Fixing block screw; 28. Circuit breaker socket slot. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example 1: Please see Figures 1 to 9 A circuit breaker distribution chassis, comprising a base 1 and an upper cover 2; Both the base 1 and the top cover 2 are made of high-insulation engineering plastic through an integrated injection molding process; The base 1 is provided with a first elastic locking foot 3, and the upper cover 2 is provided with an elastic locking foot insertion groove 4 and an elastic locking foot support wall 5 that cooperate with the first elastic locking foot 3. The first elastic clip 3 passes through the elastic clip insertion slot 4 of the upper cover 2 and is clipped onto the elastic clip support wall 5 of the upper cover 2. The first elastic clip 3 is used to fix the base 1 and the upper cover 2 of the power distribution chassis. The first elastic locking foot 3 has a first mounting hole 6 with its bottom end communicating with the outside. An elastic element 7 is fixedly installed in the first mounting hole 6. The ratio of the diameter of the first mounting hole 6 to the diameter of the elastic element 7 is 1.2-1.4. The bottom end of the elastic member 7 extends outside the first mounting hole 6. The distance between the bottom wall of the elastic member 7 and the bottom wall of the first mounting hole 6 is 3-5mm. The elastic member 7 is provided with an expansion mechanism for expanding the elastic member 7. The elastic member 7 expands in volume after being heated to press against the elastic foot support wall 5.

[0029] Under high-current operation, circuit breakers inevitably experience temperature rise at connection points due to conductor resistance. According to Joule's law: Q=I... 2RT, heat is proportional to the square of the current, therefore the circuit breaker temperature will rise.

[0030] The expansion mechanism includes a shape memory alloy wire 8 embedded in the elastic member 7. A heat-conducting rod 9 with its end communicating with the outside is uniformly embedded on the elastic member 7. The other end of the heat-conducting rod 9 is attached to the side wall of the shape memory alloy wire 8. The bottom wall of the elastic member 7 is in contact with the surface of the elastic foot support wall 5. The first mounting hole 6 is configured as a spatial structure that allows the elastic element 7 to press against the elastic foot support wall 5 when it expands due to heat.

[0031] When the circuit is turned on, the current flowing through the connection points generates Joule heat. This heat is continuously dissipated outwards, causing the air temperature around the base 1 and the top cover 2 to gradually rise. At this time, the heat-conducting rod 9, which is set in the structure, quickly conducts the accumulated heat to the shape memory alloy wire 8, causing the shape memory alloy wire 8 to stretch due to heat.

[0032] When the shape memory alloy wire 8 extends, it causes the elastic element 7 to expand and deform axially or radially. The outer surface of the expanded elastic element 7 fits tightly against the surrounding elastic foot support wall 5, increasing the contact area and significantly improving the static friction and structural damping between them. Through the coupling of thermodynamics and structural mechanics, the slight displacement or loosening tendency of the upper cover 2 relative to the base 1 is effectively suppressed, greatly reducing the probability of the upper cover 2 shaking under external vibration or impact, thereby improving the overall rigidity and long-term stability of the connection between the upper cover 2 and the base 1.

[0033] The first elastic locking foot 3 includes an elastic sheet 301 and a barb 302, and the first mounting hole 6 is formed on the bottom wall of the barb 302; At room temperature and in a cold state, relying on the structural elasticity of the first elastic locking foot 3, its end barb 302 passes through the elastic locking foot insertion groove 4 and forms a mechanical engagement with the elastic locking foot support wall 5. At this time, the locking foot itself provides basic tensile strength to ensure the stability of the circuit breaker during transportation and in non-operating conditions.

[0034] When the system is put into operation and the temperature rises, the expansion mechanism activates, the volume of the elastic element 7 increases, filling the installation gap and providing additional radial clamping force. This stage is mainly used to eliminate material fretting caused by temperature rise and to resist electromagnetic vibration during operation.

[0035] like Figure 3 As shown, the base 1 is provided with a distribution box mounting hole 10, a first positioning post 11, a mounting support surface 12, and a fixing base surface 13. The mounting hole 10 and the first positioning post 11 are both arranged on the same plane of the mounting support surface 12, and the two first positioning posts 11 are symmetrically distributed on both sides of the mounting hole 10, forming a stable and reliable centering and positioning function.

[0036] The mounting support surface 12 provides stable support for the distribution box and together with the fixed base surface 13, forms a complete mounting structure, thereby ensuring that the distribution box can be accurately and firmly installed in the predetermined position, achieving the dual requirements of electrical connection and mechanical fixation.

[0037] like Figure 3 As shown, the base 1 is provided with a bottom insulating plate 14, an external bus mounting positioning groove 15, an external bus mounting positioning post 16, and an external bus mounting hole 17; The bottom insulating plate 14 is made of highly insulating material, achieving electrical isolation between the external busbar and various metal components, preventing leakage or short circuit risks, and ensuring operational safety. The external busbar mounting positioning groove 15 is an elongated guide structure used for lateral limiting and pre-positioning of the busbar during the initial installation phase. The corresponding external busbar mounting positioning post 16 provides a vertical positioning reference, ensuring that the busbar holes align with the mounting holes on the base 1. Finally, the busbar can be securely fastened to the base 1 using standard fasteners through the external busbar mounting holes 17, thus achieving both mechanical fixation and electrical connection.

[0038] like Figure 2 , Figure 4 As shown, the base 1 is provided with a first fixing foot 18 of the circuit breaker, and the upper cover 2 is provided with a circuit breaker fixing foot insertion groove 19 that cooperates with the first fixing foot 18 of the circuit breaker. During assembly, the first fixing foot 18 of the circuit breaker on the base 1 passes vertically upward through the circuit breaker fixing foot insertion slot 19 of the upper cover 2, forming a through-type mechanical interlocking structure. This provides installation guidance and radial limiting for the plug-in circuit breaker, restricting displacement and loosening of the circuit breaker due to vibration or electromagnetic force during energized operation.

[0039] This securely confines the circuit breaker within the installation space formed by the base 1 and the top cover 2, significantly improving the circuit breaker's installation rigidity and vibration resistance, thereby ensuring the electrical connection reliability and operational safety during long-term operation.

[0040] like Figure 1 , Figure 2 As shown, a first insulating wall 20 is provided on the base 1, and an insulating wall insertion groove 21 that mates with the first insulating wall 20 is provided on the upper cover 2; The first insulating wall 20 is inserted into the insulating wall insertion slot 21 of the upper cover 2. The first insulating wall 20 is used for positioning between multi-pole circuit breakers and increasing the electrical creepage distance between circuit breakers.

[0041] like Figure 1As shown, an independent electrical connection plate 22 is fixedly installed inside the base 1. The independent electrical connection plate 22 is provided with a conductive plug plate 23, an assembly positioning hole 24 and a busbar connection hole 25. The conductive plug 23 is used for electrical connection with the socket of the circuit breaker, the assembly positioning hole 24 is used for assembly positioning of the base 1, and the busbar connection hole 25 is used for connecting the electrical lines of the external busbar.

[0042] like Figure 1 As shown, the conductive insert 23 is made of high-strength copper alloy material, thereby improving the conductivity and heat conduction effect.

[0043] like Figure 8 , Figure 9 As shown, the upper cover 2 is provided with an embedded fastening nut 26, and the base 1 is provided with a fixing block screw 27 that cooperates with the embedded fastening nut 26; the embedded fastening nut 26 is used to fasten the connection with the corresponding fixing block screw 27.

[0044] like Figure 6 As shown, the upper cover 2 is provided with a circuit breaker socket slot 28 for inserting and installing a plug-in circuit breaker socket.

[0045] Instructions for use: During installation, first assemble the independent electrical connection plate 22 into the assembly slot of the base 1 in the correct direction and sequence. Then, assemble the external busbar into the corresponding fixing slot of the base 1 and fix it with the corresponding bolts. Finally, place the top cover 2 on the base 1 in the corresponding direction and press it into place so that the elastic clips pass through the elastic clips of the top cover 2, insert into the slot 4, and lock onto the elastic clip support wall 5 of the top cover 2, thus completing the assembly of the power distribution chassis.

[0046] The above description is merely a preferred embodiment of the present invention; however, 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 its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A circuit breaker distribution chassis, comprising a base (1) and a top cover (2); Its features are: The base (1) and the top cover (2) are both made of high-insulation engineering plastic through an integrated injection molding process; The base (1) is provided with a first elastic locking foot (3), and the upper cover (2) is provided with an elastic locking foot insertion groove (4) and an elastic locking foot support wall (5) that cooperate with the first elastic locking foot (3). The first elastic clip (3) passes through the elastic clip insertion slot (4) of the upper cover (2) and is clipped onto the elastic clip support wall (5) of the upper cover (2). The first elastic clip (3) is used to fix the base (1) and the upper cover (2) of the power distribution chassis. The first elastic foot (3) has a first mounting hole (6) with its bottom end communicating with the outside. An elastic element (7) is fixedly installed in the first mounting hole (6). The elastic element (7) expands in volume after being heated to press against the elastic foot support wall (5). The bottom end of the elastic element (7) extends outside the first mounting hole (6), and the elastic element (7) is provided with an expansion mechanism for expanding the elastic element (7); the expansion mechanism includes a memory alloy wire (8) embedded in the elastic element (7), and a heat-conducting rod (9) with its end communicating with the outside is uniformly embedded on the elastic element (7), and the other end of the heat-conducting rod (9) is in contact with the side wall of the memory alloy wire (8), and the bottom wall of the elastic element (7) is in contact with the surface of the elastic clip support wall (5); An independent electrical connection plate (22) is fixedly installed inside the base (1). The independent electrical connection plate (22) is provided with a conductive plug plate (23), an assembly positioning hole (24) and a busbar connection hole (25).

2. The distribution chassis of a circuit breaker according to claim 1, characterized in that: The base (1) is provided with a power distribution box mounting and fixing hole (10), a first positioning post (11), a mounting support surface (12) and a fixing base surface (13). The fixing hole (10) and the first positioning post (11) are both provided on the surface of the mounting support surface (12), and the first positioning post (11) is symmetrically distributed on both sides of the fixing hole (10).

3. The distribution chassis of a circuit breaker according to claim 1, characterized in that: The base (1) is provided with a bottom insulating plate (14), an external bus mounting positioning groove (15), an external bus mounting positioning post (16), and an external bus mounting hole (17).

4. The distribution chassis of a circuit breaker according to claim 1, characterized in that: The base (1) is provided with a first fixing foot (18) of the circuit breaker, and the upper cover (2) is provided with a circuit breaker fixing foot insertion groove (19) that cooperates with the first fixing foot (18) of the circuit breaker.

5. The distribution chassis of a circuit breaker according to claim 1, characterized in that: The base (1) is provided with a first insulating wall (20), and the upper cover (2) is provided with an insulating wall insertion groove (21) that cooperates with the first insulating wall (20).

6. The distribution chassis of a circuit breaker according to claim 1, characterized in that: The conductive plug (23) is made of high-strength copper alloy material.

7. The distribution chassis of a circuit breaker according to claim 1, characterized in that: The upper cover (2) is provided with an embedded fastening nut (26), and the base (1) is provided with a fixing block screw (27) that cooperates with the embedded fastening nut (26).

8. The distribution chassis of a circuit breaker according to claim 1, characterized in that: The upper cover (2) is provided with a circuit breaker socket slot (28).

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