A non-polar high-voltage miniature circuit breaker

Abstract

The application discloses a non-polarity high-voltage miniature circuit breaker, which comprises a shell, wire holes for accommodating wiring terminals are arranged at two ends of the shell, at least one group of fixed rotating shafts are arranged on the outer walls of the shell at the two sides of the wire holes, and two fixed rotating shafts in the same group are located on the same axis; at least one fixing frame is further included, the fixing frame comprises a connecting part and adjusting parts fixed at two ends of the connecting part, the ends of the two adjusting parts are respectively rotatably connected to the two fixed rotating shafts, and heat dissipation members for heat dissipation are arranged on the side of the adjusting parts facing the outer wall of the shell; when a large amount of heat is generated during high-voltage detection of the circuit breaker, an operator can rotate the fixing frame, so that the heat dissipation members are maximally close to the area of the circuit breaker shell where heat generation is most serious, heat conduction and convection loss from the shell to the external environment are accelerated, and the forced cooling waiting time after detection is shortened.

Description

Technical Field

[0001] This application relates to the technical field of circuit breakers, and in particular to a non-polar high-voltage miniature circuit breaker. Background Technology

[0002] Miniature circuit breakers, as key protective components in power systems, are widely used in overload and short-circuit protection scenarios for various electrical equipment and lines. Among them, high-voltage miniature circuit breakers, with their advantages of small size and adaptability to high-voltage conditions, are increasingly widely used in precision electrical equipment, high-voltage power distribution systems, and other fields. In the manufacturing process of high-voltage miniature circuit breakers, in order to ensure the electrical performance and safety reliability of the products, each batch of circuit breakers must undergo strict factory testing.

[0003] In the existing testing process, a batch of miniature circuit breakers to be tested are hooked onto the guide rail of a standard circuit breaker testing bench. The circuit breakers are then connected by wires, and currents of different multiples, such as 1.12 to 10 times the rated current, are applied to measure the operating time of the circuit breakers and determine whether they are within the threshold range specified in the standard, ensuring that they operate reliably within the maximum breaking time specified in the standard.

[0004] However, when a circuit breaker is subjected to a multiple of its rated current, the Joule heat generated by the current passing through the conductors will continue to accumulate on the surface of the circuit breaker housing and internal components because the circuit breaker needs to withstand the current load for a long time, resulting in a significant increase in the surface temperature of the circuit breaker. Therefore, when a different multiple of the rated current needs to be applied to the circuit breaker, it is only possible to rely on natural cooling to wait for the surface temperature of the circuit breaker to drop to a safe range before the next test of a different multiple of the rated current can be carried out. Therefore, the physical cooling process of the circuit breaker test in the existing technology is time-consuming, which prolongs the test cycle of a single batch of circuit breakers and reduces the overall production and testing efficiency. Summary of the Invention

[0005] To reduce the cooling time of a circuit breaker when different multiples of the rated current are applied, a non-polar high-voltage miniature circuit breaker is provided.

[0006] The above-mentioned objective of this application is achieved through the following technical solution: A non-polar high-voltage miniature circuit breaker includes a housing, with wire holes for accommodating terminals at both ends of the housing. At least one set of fixed rotating shafts is provided on the outer wall of the housing on both sides of the wire holes, and two fixed rotating shafts in the same set are located on the same axis. It also includes at least one fixing frame, the fixing frame including a connecting part and an adjusting part fixed to both ends of the connecting part, and the ends of the two adjusting parts are respectively rotatably connected to two fixed rotating shafts, and a heat dissipation component is installed on the side of the adjusting part facing the outer wall of the housing.

[0007] By adopting the above technical solution, after the rated current is applied to the circuit breaker and the trip is achieved, the operator can rotate the mounting bracket so that the heat sink is as close as possible to the area of ​​the circuit breaker housing where the heat is most severe. Compared with natural cooling, this accelerates the conduction and convection of heat from the housing to the external environment, effectively shortening the forced cooling waiting time after the test, and thus facilitating the test of the next multiple of the rated current.

[0008] Preferably, an operating handle for controlling the main circuit of the circuit breaker is provided on one side of the housing, and two sets of fixed rotating shafts are provided on the outer walls of both sides of the housing for setting the fixing bracket. When the installation direction of the two fixing brackets is perpendicular to the axis of the wire hole, the connecting part covers the top of the operating handle. Locking elements are detachably connected to the outer walls on both sides of the housing, and the locking elements are used to restrict the fixed frame to different working positions.

[0009] By adopting the above technical solution, the rotatable characteristics of the mounting bracket are utilized to extend its function from heat dissipation to protection. When the mounting bracket is rotated to cover the operating handle, its connecting part forms a physical barrier above the operating handle, preventing accidental impacts of external objects on the operating handle during the transportation of the circuit breaker, avoiding handle breakage or damage to the internal linkage mechanism. The locking component ensures the reliability of the heat dissipation or protection status, reducing the risk of product damage due to accidental collisions during transportation or storage.

[0010] Preferably, when the installation direction of the two fixing brackets is the same as the axis of the wire hole, the cross section of the connecting part is aligned with the cross section of the wire hole, and the connecting part has a wire-binding hole for constraining the wire along the axial direction of the wire hole.

[0011] By adopting the above technical solution and utilizing the rotational positioning function of the fixing frame, when it rotates to the heat dissipation position, the wire harness hole on its connecting part naturally aligns with the wire hole. The wire passes through the wire harness hole and is then connected to the terminal. The wire harness hole plays a role in gathering and radially constraining the wire, thereby achieving orderly arrangement and fixation of the wire.

[0012] Preferably, the adjusting part has at least two limiting holes on the outer wall near the fixed rotating shaft end, and locking grooves are respectively opened on the outer walls of both sides of the housing along the axial direction perpendicular to the wire hole. The locking member includes a locking block that slides in the locking groove, and one side of the locking block is located outside the locking groove and facing the fixing frame, with a limiting pin fixed for insertion into the limiting hole.

[0013] By adopting the above technical solution, the sliding of the locking block in the locking groove provides linear motion, and finally the rotation angle of the fixed frame is fixed by inserting the limiting pin into the limiting hole at different positions. This ensures that the fixed frame will not shift due to its own weight, slight touch or vibration in the heat dissipation or protection position, and ensures the stability of the fixed frame under various working conditions.

[0014] Preferably, the cross-section of the locking groove along its own slotting direction is dovetail-shaped, and the locking block is dovetail-shaped to match the locking groove.

[0015] By adopting the above technical solution, a mechanical self-locking effect is formed by utilizing the dovetail cross-sectional shape. When the locking block is embedded in the dovetail groove, it is firmly stuck by the groove wall on the plane perpendicular to the sliding direction, and cannot be directly lifted or detached, thereby improving the reliability of the connection between the locking component and the housing and the ability to prevent it from falling off.

[0016] Preferably, a locking plate covering the locking groove is fixed on the side of the housing opposite to the operating handle, and a locking spring in a compressed state is fixed between the locking plate and the locking block.

[0017] By adopting the above technical solution, the locking spring in the compressed state will continuously apply a thrust to the locking block. This thrust will be transmitted to the limiting pin, so that it always has a tendency to press tightly against the inner wall of the limiting hole, thereby achieving an elastic lock with self-preload and enhancing the stability and reliability of the lock.

[0018] Preferably, the end of the adjusting part near the fixed rotating shaft has a chamfer.

[0019] By adopting the above technical solution, the chamfer acts as a guiding arc surface, which contacts the limiting pin during the rotation of the fixed frame. The force generated by the rotation is decomposed into a component force that forces the locking block to compress the spring and move backward. This allows the limiting pin to slide into another limiting hole along this arc surface under the action of the locking spring after sliding out of the current limiting hole. The operator does not need to continuously press the locking block; simply rotating the fixed frame is sufficient to automatically complete the unlocking and relocking.

[0020] Preferably, a connecting strip is fixed on the outer wall of the locking block, and a fixing strip connecting the two connecting strips is fixed at the ends of the two connecting strips.

[0021] By adopting the above technical solution, the locking block, connecting strip and fixing strip together form a rigidly connected frame linkage mechanism, realizing synchronous control of the locking blocks on both sides of the housing, ensuring that the two fixing frames can switch positions and lock synchronously, and simplifying the operation process.

[0022] Preferably, the fixing strip has several insulating baffles fixed on the side near the wire hole, and the insulating baffles are respectively inserted into the gap between adjacent wire holes.

[0023] By adopting the above technical solution, when the operator slides the locking block to fix the heat dissipation position, the insulating baffle moves synchronously and inserts into the gap between the wires, physically increasing the creepage distance and electrical clearance between wires at different potentials. Without the need for additional operating steps, a reliable physical isolation barrier is formed to prevent phase-to-phase short circuit accidents.

[0024] In summary, this application has at least the following beneficial effects: 1. When the circuit breaker is in the detection state, the adjustable mounting bracket can accurately position the heat sink to the core heat-generating area of ​​the casing, significantly accelerating heat dissipation through active cooling and shortening the cooling waiting time between detection intervals; when switching to the transport state, the same mounting bracket can be rotated to transform into a protective cover covering the operating handle, combined with a spring-preloaded dovetail locking mechanism, forming an impact-resistant barrier to effectively avoid mechanical damage during handling. 2. With a single sliding of the locking block, the operator can simultaneously lock the fixed frame position and insert the insulating baffle into the wire gap, forming a synergistic effect of electrical isolation and position locking. This internalizes the safe operating procedures in high-voltage testing into the inherent function of the product, avoiding the risk of short circuits caused by human negligence. Attached Figure Description

[0025] Figure 1 A three-dimensional structural diagram of the circuit breaker in the detection state; Figure 2 This is a three-dimensional structural diagram of a circuit breaker in transport mode. Figure 3 Schematic diagram of an explosion between the locking element and the mounting bracket. Figure 1 ; Figure 4 Schematic diagram of an explosion between the locking element and the mounting bracket. Figure 2 ; Figure 5 This is a three-dimensional structural diagram of the locking element and the housing.

[0026] Reference numerals: 1. Housing; 11. Wire hole; 12. Wiring hole; 13. Fixed shaft; 14. Operating handle; 15. Locking groove; 2. Fixing bracket; 21. Connecting part; 211. Cable harness hole; 212. Rubber ring; 22. Adjusting part; 221. Rotating hole; 222. Limiting hole; 23. Heat sink; 3. Locking part; 31. Locking block; 32. Limiting pin; 33. Locking plate; 34. Locking spring; 4. Connecting strip; 5. Fixing strip; 6. Insulating baffle. Detailed Implementation

[0027] The following section provides a more detailed description, in conjunction with the accompanying diagrams: As attached Figure 1 and attached Figure 2 As shown, a non-polar high-voltage miniature circuit breaker includes a housing 1. Both ends of the housing 1 have wire holes 11 that communicate with the interior of the housing 1. The wire holes 11 are used to accommodate metal terminals. Both ends of the housing 1 also have wiring holes 12 that communicate with the wire holes 11. The wire holes 11 are used to install wires. The axial direction of the wiring holes 12 is perpendicular to the axial direction of the wire holes 11. Wiring screws for fixing wires are usually installed in the wiring holes 12.

[0028] At least one set of fixed rotating shafts 13 are respectively provided in the middle part of the outer wall on both sides of the wire hole 11. There are two sets of fixed rotating shafts 13, each set containing two fixed rotating shafts 13, and the two fixed rotating shafts 13 in the same set are strictly kept on the same axis.

[0029] At least one fixing frame 2 is provided on the outer wall of the housing 1. There are two fixing frames 2. The fixing frame 2 is U-shaped in general. Each fixing frame 2 includes a connecting part 21 and two adjusting parts 22. The connecting part 21 and the adjusting parts 22 are integrally formed. Both the connecting part 21 and the adjusting parts 22 are long strips. The two adjusting parts 22 are arranged opposite to each other. One end of the two adjusting parts 22 is perpendicularly fixedly connected to the two ends of the connecting part 21. The other end of the two adjusting parts 22 has a rotating hole 221 that is rotatably connected to the fixed rotating shaft 13. The fixing frame 2 can rotate about the fixed rotating shaft 13 as the axis.

[0030] The adjusting parts 22 of the two fixed frames 2 rotate on two sets of fixed rotating shafts 13 respectively. The fixed frames 2 have two working positions that rotate around the fixed rotating shafts 13. When the fixed frames 2 and the fixed rotating shafts 13 are in the first working position, the two fixed frames 2 are parallel and in the same axial direction as the wire hole 11. At this time, the cross-section of the connecting part 21 on the two fixed frames 2 is aligned with the cross-section of the two wire holes 11 respectively. The two connecting parts 21 are also provided with a number of wire-binding holes 211 along the axial direction of the wire hole 11. The number of wire-binding holes 211 is the same as the number of wire holes 11 and is aligned with the wire holes 11. In actual process, a rubber ring 212 is also fixedly connected to the inner wall of the wire-binding hole 211. While constraining the wire, the wire-binding hole 211 can also increase the friction.

[0031] Each adjustment section 22 is fixed with a heat sink 23 on the side facing the outer wall of the housing 1. The heat sink 23 is a miniature cooling fan. In practice, other heat sinks can also be used. In the first working state, the heat sink 23 can be aligned with the outer wall of the housing 1 to dissipate heat. In practice, a temperature detection device can also be installed on the adjustment section 22 to detect high temperature during the installation and use of the circuit breaker and activate the heat sink 23 to dissipate heat.

[0032] One side of the housing 1 is provided with an operating handle 14 for controlling the opening and closing of the main circuit of the circuit breaker. When the fixed frame 2 and the fixed rotating shaft 13 are in the second working position, the two fixed frames 2 are parallel and perpendicular to the axial direction of the wire hole 11, and the two connecting parts 21 cover the operating handle 14 to form a protective effect. The adjusting part 22 can be used to install the heat sink 23 to dissipate heat from the housing 1 during the circuit breaker testing process. The adjusting part 22 can also serve as a support for the operating handle 14 during the circuit breaker transportation process. Therefore, the functions of the adjusting part 22 are mutually supportive in different states of the circuit breaker. The connecting part 21 can be used to limit the wire during the circuit breaker testing or use process. The connecting part 21 can cover the operating handle 14 for shielding during the circuit breaker transportation process. Therefore, the functions of the connecting part 21 are also mutually supportive in different states of the circuit breaker.

[0033] As attached Figure 3 and attached Figure 4 As shown, in order to enable the fixing bracket 2 of the circuit breaker to be locked in different states, locking members 3 that can be continuously connected are provided on the outer walls of both sides of the housing 1. The locking members 3 are used to restrict the fixing bracket 2 to be in different positions. Locking grooves 15 are respectively opened on the outer walls of both sides of the housing 1 along the axial direction perpendicular to the wire hole 11. The locking member 3 includes a locking block 31 that slides in the locking groove 15. One side of the locking block 31 is located outside the locking groove 15 and moves, while the other side of the locking block 31 is restricted in the locking groove 15.

[0034] At least two limiting holes 222 are provided on the outer wall of the adjusting part 22 near the fixed rotating shaft 13. One limiting hole 222 is located on the side wall of the adjusting part 22, and the other is located at the end of the adjusting part 22. The opening cross-section of the limiting holes 222 is rectangular. A limiting pin 32 with a circular cross-section is fixed to the side of the locking block 31 outside the locking groove 15 facing the fixing frame 2. The setting of the limiting pin 32 and the rectangular cross-section limiting hole 222 facilitates the sliding of the limiting pin 32 in the limiting hole 222. When the fixed frame 2 is in the first working position, the limiting pin 32 is perpendicular to the fixed frame 2 and inserted into a limiting hole 222 on the side wall. When the fixed frame 2 is in the second working position, the limiting pin 32 is parallel to the fixed frame 2 and inserted into a limiting hole 222 at the end. The limiting pin 32 and the limiting hole 222 limit the fixed frame 2 to lock the fixed frame 2 in different working positions.

[0035] The adjustment part 22 has an arc-shaped chamfer at one end near the fixed rotating shaft 13. This chamfer acts as a guide arc surface and contacts the limiting pin 32 during the rotation of the fixed frame 2. It decomposes the force generated by the rotation into a component force that forces the locking block 31 to compress the spring and move backward. After the limiting pin 32 slides out of the current limiting hole 222, it can slide into another limiting hole 222 along this arc surface under the action of the locking spring 34, without the operator having to continuously press the locking block 31.

[0036] The locking groove 15 has a dovetail-shaped cross section along its own slotting direction. The locking block 31 is a dovetail-shaped block that matches the locking groove 15. The housing 1 is located at the bottom of the housing 1 opposite to the operating handle 14. A long strip locking plate 33 is fixed to it by four screws. The locking plate 33 completely covers the locking groove 15 on the outer wall of the housing 1. A locking spring 34 in a compressed state is fixed between the locking plate 33 and the locking block 31. The locking spring 34 in a compressed state will continuously apply a pushing force to the locking block 31. This pushing force will be transmitted to the limiting pin 32, so that it always has a tendency to press tightly against the inner wall of the limiting hole 222, thereby achieving an elastic lock with self-preload.

[0037] As attached Figure 4 and attached Figure 5 As shown, a connecting strip 4 is fixed on the outer wall of the locking block 31. The installation direction of the connecting strip 4 is the same as the axial direction of the wire hole 11. There are two connecting strips 4, which are located on both sides of the outer wall of the housing 1. Each connecting strip 4 has a fixed strip 5 integrally formed at its end, which is perpendicular to the connecting strip 4. The two connecting strips 4 and the two fixed strips 5 are connected end to end to form a frame structure. When the locking block 31 is moved by the connecting strip 4, the two adjustment parts 22 can be unlocked at the same time without adjusting one side first and then the other side.

[0038] The fixing strip 5 is fixed with several insulating baffles 6 on the side near the wire hole 11. Each insulating baffle 6 is inserted into the gap between adjacent wire holes 11. When the operator slides the locking block 31 to fix the heat dissipation position, the insulating baffles 6 move synchronously and are inserted into the gap between the wires. Based on the simultaneous unlocking of the two adjustment parts 22, the increase of the insulating baffles 6 utilizes the sliding distance of the locking block 31 to increase the creepage distance and electrical clearance between wires with different potentials, forming a reliable physical isolation barrier without the need for additional operation steps.

[0039] The implementation principle of this embodiment: During testing and operation, when a high rated current is applied to the circuit breaker for performance testing, the current generates a large amount of Joule heat through the internal conductors, causing the temperature of the casing 1 to rise significantly. The operator rotates the mounting bracket 2 to the first position, that is, the mounting bracket 2 is parallel to the axis of the wire hole 11, so that the heat sink 23 is directly close to the area of ​​the casing 1 where the heat is most severe. Through active heat dissipation, the heat is accelerated to conduct and convection to the external environment, effectively shortening the forced cooling waiting time after the test, and facilitating the rapid conduction of the next round of testing. At the same time, the wire harness hole 211 on the connecting part 21 is aligned with the wire hole 11 to gather and fix the connected wires, ensuring orderly wiring. In the transport state, the operator rotates the fixing frame 2 to the second position, that is, the fixing frame 2 is perpendicular to the axis of the wire hole 11. At this time, the connecting part 21 covers the operating handle 14, forming a physical protective barrier to prevent external objects from accidentally hitting the operating handle 14 and causing breakage or damage to the internal mechanism during transportation. The locking part 3 automatically locks the position of the fixing frame 2 by inserting the limiting pin 32 into the limiting hole 222, ensuring the stability of the protective state, reducing the risk of damage to the product during handling, and realizing the safety protection of the circuit breaker when it is not in use.

[0040] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of protection claimed in this application.

Claims

1. A non-polar high-voltage miniature circuit breaker, comprising a housing (1), wherein both ends of the housing (1) are respectively provided with wire holes (11) for accommodating terminals, characterized in that, The housing (1) has at least one set of fixed rotating shafts (13) on the outer walls on both sides of the wire hole (11), and the two fixed rotating shafts (13) in the same set are located on the same axis. It also includes at least one fixing frame (2), the fixing frame (2) includes a connecting part (21) and an adjusting part (22) fixed to both ends of the connecting part (21), and the ends of the two adjusting parts (22) are respectively rotatably connected to two fixed rotating shafts (13), and a heat sink (23) for heat dissipation is installed on the side of the adjusting part (22) facing the outer wall of the housing (1).

2. The miniature circuit breaker with non-polarity high voltage according to claim 1, characterized in that, The housing (1) is provided with an operating handle (14) on one side for controlling the main circuit of the circuit breaker to be turned on and off, and two sets of fixed rotating shafts (13) are provided on the outer walls of both sides of the housing (1) for setting the fixing frame (2). When the installation direction of the two fixing frames (2) is perpendicular to the axis of the wire hole (11), the connecting part (21) covers the top of the operating handle (14). Locking elements (3) are detachably connected to the outer walls on both sides of the housing (1). The locking elements (3) are used to restrict the fixing frame (2) to be in different positions.

3. A non-polar high-voltage miniature circuit breaker according to claim 2, characterized in that, When the installation direction of the two fixing brackets (2) is the same as the axis of the wire hole (11), the cross section of the connecting part (21) is aligned with the cross section of the wire hole (11), and the connecting part (21) has a wire-binding hole (211) for constraining the wire along the axial direction of the wire hole (11).

4. A non-polar high-voltage miniature circuit breaker according to claim 2, characterized in that, The adjustment part (22) has at least two limiting holes (222) on the outer wall near the fixed rotating shaft (13). The outer walls on both sides of the housing (1) have locking grooves (15) respectively along the axial direction perpendicular to the wire hole (11). The locking member (3) includes a locking block (31) that slides in the locking groove (15). One side of the locking block (31) is located outside the locking groove (15) and is fixed to the fixing frame (2) with a limiting pin (32) for insertion into the limiting hole (222).

5. A non-polar high-voltage miniature circuit breaker according to claim 4, characterized in that, The locking groove (15) has a dovetail-shaped cross section along its own slotting direction, and the locking block (31) is a dovetail-shaped structure that matches the locking groove (15).

6. A non-polar high-voltage miniature circuit breaker according to claim 4, characterized in that, The housing (1) has a locking plate (33) fixed on the side opposite to the operating handle (14) covering the locking groove (15), and a locking spring (34) in a compressed state is fixed between the locking plate (33) and the locking block (31).

7. A non-polar high-voltage miniature circuit breaker according to claim 6, characterized in that, The adjustment part (22) has a chamfer at one end near the fixed rotating shaft (13).

8. A non-polar high-voltage miniature circuit breaker according to claim 4, characterized in that, The outer wall of the locking block (31) is fixed with a connecting strip (4), and the ends of the two connecting strips (4) are fixed with a fixing strip (5) connecting the two.

9. A non-polar high-voltage miniature circuit breaker according to claim 8, characterized in that, The fixing strip (5) is fixed with several insulating baffles (6) on the side near the wire hole (11), and the insulating baffles (6) are respectively inserted into the gap between adjacent wire holes (11).

Images