Electromagnetic double gold combined structure large shell frame small current circuit breaker

Abstract

The utility model relates to a kind of electromagnetic double gold combination structure's large shell frame small current circuit breaker, and the electromagnetic mechanism and double gold component parallel structure design are passed through, electromagnetic mechanism and double gold component can independently monitor circuit state, electromagnetic mechanism is mainly aimed at short-circuit fault fast response, when circuit appears short-circuit, small current coil rapidly produces strong electromagnetic force, drives moving iron core action, rapidly cuts off circuit, avoid short-circuit current to cause serious damage to equipment, double gold component is focused on overload protection, bimetallic strip gradually deforms under the heat action of current, both parallel operation, do not interfere with each other and cooperate, for circuit provide more comprehensive, reliable protection, its L type resistance wire uses side heating type structure, compared with traditional direct heating mode, can increase heat transfer area, so that bimetallic strip can accumulate enough heat and deform in shorter time.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a large-frame low-current circuit breaker with an electromagnetic double-metal composite structure. Background Technology

[0002] As a critical protective device, circuit breakers must accurately connect, carry, and break current under both normal and abnormal circuit conditions (such as short circuits), and their performance is crucial to the safety of power systems. With the development of industrial technology, precision industrial scenarios place stringent standards on circuit breakers in terms of temperature rise control and breaking capacity. In industrial applications, there is an urgent need for large-frame circuit breakers to meet low-current specifications (e.g., 10-40A). While small-frame circuit breakers can meet some basic characteristics, their breaking capacity is generally only 6-15kA, and their temperature rise is prone to being too high, making them unsuitable for harsh industrial environments. Through technological innovation, large-frame circuit breakers can achieve breaking capacities of 20-50kA, with larger heat dissipation space, a more rational structure, and superior temperature rise and stability. However, there are challenges in making low-current products with large-frame circuit breakers (125 frame). Their heating characteristics are incompatible with low-current requirements. Traditional designs cannot meet the low-current protection characteristics. Existing technologies use electromagnetic and bimetallic systems in series and high-resistance conductive circuits to achieve low-current protection, but this leads to product temperature rise and unstable delay, making it unreliable in harsh industrial environments. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a large-frame low-current circuit breaker with multiple protection mechanisms, rapid action response, and high reliability and stability through an electromagnetic bimetallic composite structure.

[0004] To achieve the above objectives, this utility model employs a large-frame low-current circuit breaker with an electromagnetic bimetallic composite structure, comprising a housing. The housing houses an operating mechanism, a wiring assembly, an electromagnetic mechanism, and a bimetallic assembly. The wiring assembly includes a stationary wiring assembly and a moving wiring assembly respectively installed at both ends of the housing. The electromagnetic mechanism includes a magnetic yoke, within which are a stationary iron core and a moving iron core. A push rod is coaxially connected between the stationary and moving iron cores, with the stationary and moving iron cores extending from both ends of the push rod. A core spring is wound around the push rod, with one end of the core spring abutting against the push rod at one end of the moving iron core, and the other end abutting against... On the corresponding end faces of the stationary iron core, an electromagnetic sleeve is fitted on the outer wall of the stationary iron core and the moving iron core. A small current coil is wound on the outer wall of the electromagnetic sleeve. The electromagnetic sleeve is mounted on the magnetic yoke. The bimetallic assembly includes a bimetallic adjustment bracket and a bimetallic sheet. An adjustment screw is snapped onto the magnetic yoke. One end of the bimetallic adjustment bracket abuts against the magnetic yoke, and the other end has a U-shaped opening and is snapped onto the adjustment screw. A bimetallic sheet is provided at one end of the bimetallic adjustment bracket. An L-shaped resistance wire is arranged between the bimetallic sheet and the bimetallic adjustment bracket. A moving connection plate is provided on the moving connection assembly. The bimetallic sheet and the moving connection plate are connected by a flexible connection.

[0005] The beneficial effects of the above structure are as follows: Through the parallel design of the electromagnetic mechanism and the bimetallic component, the electromagnetic mechanism and the bimetallic component can independently monitor the circuit status. The electromagnetic mechanism is mainly for rapid response to short-circuit faults. When a short circuit occurs in the circuit, the small current coil quickly generates a strong electromagnetic force, driving the moving iron core to act and quickly cut off the circuit, avoiding serious damage to the equipment caused by the short-circuit current. The bimetallic component focuses on overload protection. The bimetallic sheet gradually deforms under the heat generated by the current. The two work in parallel without interfering with each other and cooperate to provide more comprehensive and reliable protection for the circuit. Its L-shaped resistance wire adopts a side-heating structure, which can increase the heat transfer area compared with the traditional direct heating method, allowing the bimetallic sheet to accumulate enough heat and deform in a shorter time.

[0006] This utility model is further configured such that a contact plate is provided on one side of the magnetic yoke, and contact points are provided on the contact plate. A moving contact is engaged on the operating mechanism. A first moving contact point and a second moving contact point are respectively provided on both sides of the moving contact. The first moving contact point on the moving contact is correspondingly arranged with the contact points on the contact plate, and a first arc-guiding plate is welded to the lower end of the contact point to guide the electric arc. By setting contact points on the contact plate and corresponding them with the first moving contact points of the moving contact, this design ensures that the circuit can achieve a stable and reliable electrical connection in the closed state. The first arc-guiding plate welded to the lower end of the contact point can guide the electric arc when the circuit is broken and an electric arc is generated. The first arc-guiding plate protects the contact points and the first moving contact point from the high temperature erosion of the electric arc.

[0007] This utility model is further configured with a static terminal block on the static terminal assembly. The static terminal block has an insulating component, which includes an insulating element snapped onto one side of the static terminal block and an insulating sheet covering the other side. The static terminal block extends to the side of the contact plate via an insulating groove on the insulating element. The static terminal block has a static contact, and a second moving contact on the moving contact corresponds to the static contact. A second arc-guiding piece is welded to the lower end of the contact point to guide the electric arc. By providing an insulating component on the static terminal block, the insulating element snapped onto one side and the insulating sheet covering the other side together form a multi-layered insulation protection. The insulating groove design on the insulating element ensures that the static terminal block can extend to the side of the contact plate to achieve electrical connection while effectively isolating the static terminal block from other potentially live or conductive components, greatly reducing the risk of leakage. The second arc-guiding piece welded to the lower end of the contact point guides the arc when the circuit is broken and an arc is generated, protecting the static and moving contacts from the high-temperature erosion of the arc.

[0008] This utility model is further configured such that a rotating shaft is also engaged with the magnetic yoke, and a traction rod is rotatably connected to the rotating shaft. One end of the traction rod has a U-shaped opening and is engaged with the top rod, while the other end is positioned corresponding to the buckle plate on the operating mechanism. When a fault such as a short circuit occurs in the circuit, the small current coil in the electromagnetic mechanism quickly generates a strong electromagnetic force, driving the moving iron core to move and push the top rod. The traction rod senses the movement of the top rod through the U-shaped opening and transmits the action to the whole system. After rotating around the rotating shaft, it acts on the buckle plate, triggering the operating mechanism to quickly disconnect the circuit breaker, avoiding delays and energy losses during the action transmission process.

[0009] This utility model is further configured to have an arc-blocking plate installed on the housing, the arc-blocking plate being located on the side of the moving contact corresponding to the stationary contact. By installing the arc-blocking plate on the side of the moving contact corresponding to the stationary contact, a physical barrier can be formed, confining the electric arc within the area and preventing the electric arc from spreading wantonly into the surrounding space.

[0010] This utility model further specifies that the flexible connection is made of copper braided wire. By using copper braided wire as the flexible connection, the power loss during current transmission can be effectively reduced, the power utilization efficiency can be improved, and the equipment can be ensured to operate in a high-efficiency, low-loss state. Attached Figure Description

[0011] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0012] Figure 2 This is an explosion diagram of the electromagnetic mechanism according to an embodiment of the present invention.

[0013] Figure 3This is an assembly diagram of the operating mechanism and the electromagnetic mechanism according to an embodiment of the present invention.

[0014] Figure 4 This is a schematic diagram of the contact between the moving contact and the electromagnetic mechanism in an embodiment of this utility model.

[0015] Figure 5 This is a schematic diagram of the contact between the stationary wiring assembly and the moving contact in an embodiment of this utility model.

[0016] Figure 6 This is an assembly diagram of the electromagnetic mechanism, bimetallic component, and moving wire assembly according to an embodiment of the present invention. Detailed Implementation

[0017] like Figures 1-6 As shown, an embodiment of this utility model provides a large-frame low-current circuit breaker with an electromagnetic bimetallic composite structure, including a housing 1. The housing 1 houses an operating mechanism 2, a wiring assembly 3, an electromagnetic mechanism 4, and a bimetallic assembly 5. The electromagnetic mechanism 4 uses a magnetic yoke 41 as its main support structure. The magnetic yoke 41 houses a stationary iron core 42 and a moving iron core 43, which are coaxially connected and aligned with each other. A push rod 44 extends from both ends of the push rod 44, extending from the stationary iron core 42 and the moving iron core 43 respectively. A core spring 45 is wound around the push rod 44, with one end... The top rod 44 rests against one end of the moving iron core 43, and the other end abuts against the corresponding end face of the stationary iron core 42. An electromagnetic sleeve 46 is fitted on the outer wall of the stationary iron core 42 and the moving iron core 43. A small current coil 47 is wound on the outer wall of the electromagnetic sleeve 46. The electromagnetic sleeve 46 is installed on the magnetic yoke 41. A rotating shaft 48 is also clamped on the magnetic yoke 41. A traction rod 49 is rotatably connected to the rotating shaft 48. One end of the traction rod 49 is provided with a U-shaped opening, which is clamped on the top rod 44. The other end corresponds to the buckle plate 21 provided on the operating mechanism 2.

[0018] A contact plate 6 is provided on one side of the magnetic yoke 41, and a contact point 61 is provided on the contact plate 6. A moving contact 22 is snapped onto the operating mechanism 2. A first moving contact point 23 and a second moving contact point 24 are provided on both sides of the moving contact 22. The first moving contact point 23 on the moving contact 22 is correspondingly set to the contact point 61 on the contact plate 6, and a first arc-guiding piece 62 is welded to the lower end of the contact point to guide the electric arc.

[0019] The wiring assembly 3 includes a stationary wiring assembly 31 and a moving wiring assembly 32 respectively installed at both ends of the housing 1. The stationary wiring assembly 31 is provided with a stationary wiring plate 311 and an insulating assembly 7. The insulating assembly 7 is composed of an insulating element 71 and an insulating sheet 72. The insulating element 71 is snapped onto one side of the stationary wiring plate 311 and the insulating sheet 72 is covered on the other side. The stationary wiring plate 311 extends to the side where the contact plate 6 is located through an insulating groove opened on the insulating element 71. The stationary wiring plate 311 is provided with a stationary contact 312. The second moving contact 24 on the moving contact 22 is correspondingly arranged with the stationary contact 312 on the stationary wiring plate 311. The lower end of the contact is welded with a second arc-guiding piece 313, which is also used to guide the electric arc. In addition, an arc-blocking piece 11 is installed on the housing 1. The arc-blocking piece 11 is located on the side of the moving contact 22 where the second moving contact 24 is correspondingly arranged with the stationary contact 312, which plays a role in limiting the spread of the electric arc.

[0020] The bimetallic assembly 5 includes a bimetallic adjustment bracket 51 and a bimetallic strip 52. An adjustment screw 8 is snapped onto the magnetic yoke 41. One end of the bimetallic adjustment bracket 51 rests against the magnetic yoke 41, and the other end has a U-shaped opening that is snapped onto the adjustment screw 8. A bimetallic strip 52 is provided at this end. An L-shaped resistance wire 9 is arranged between the bimetallic strip 52 and the bimetallic adjustment bracket 51. A movable connection plate 321 is provided on the movable connection assembly 32. The bimetallic strip 52 and the movable connection plate 321 are connected by a copper braided wire 10. When an overload occurs in the circuit, the bimetallic strip 52 bends and deforms due to heat. This causes the relevant components to move through the bimetallic adjustment bracket 51 and the L-shaped resistance wire 9, thereby achieving circuit disconnection protection.

[0021] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A large-frame, low-current circuit breaker with an electromagnetic bimetallic composite structure, characterized in that: The device includes a housing, within which are disposed an operating mechanism, a wiring assembly, an electromagnetic mechanism, and a bimetallic assembly. The wiring assembly comprises a stationary wiring assembly and a movable wiring assembly respectively mounted at both ends of the housing. The electromagnetic mechanism includes a magnetic yoke, within which are disposed a stationary iron core and a movable iron core. A push rod is coaxially connected between the stationary and movable iron cores, with the stationary and movable iron cores extending from both ends of the push rod. An iron core spring is wound around the push rod, with one end of the spring abutting against the push rod at one end of the movable iron core and the other end abutting against the corresponding end face of the stationary iron core. An electromagnetic sleeve is fitted on the outer wall of the device, and a small current coil is wound on the outer wall of the electromagnetic sleeve. The electromagnetic sleeve is mounted on the magnetic yoke. The bimetallic assembly includes a bimetallic adjustment bracket and a bimetallic sheet. An adjustment screw is snapped onto the magnetic yoke. One end of the bimetallic adjustment bracket abuts against the magnetic yoke, and the other end has a U-shaped opening and is snapped onto the adjustment screw. A bimetallic sheet is provided at one end of the bimetallic adjustment bracket, and an L-shaped resistance wire is arranged between the bimetallic sheet and the bimetallic adjustment bracket. A movable connection plate is provided on the movable connection assembly, and the bimetallic sheet and the movable connection plate are connected by a flexible connection.

2. The large-frame, low-current circuit breaker with an electromagnetic bimetallic composite structure according to claim 1, characterized in that: A contact plate is provided on one side of the magnetic yoke, and a contact point is provided on the contact plate. A moving contact is snapped onto the operating mechanism. A first moving contact point and a second moving contact point are provided on both sides of the moving contact. The first moving contact point on the moving contact is correspondingly set with the contact point on the contact plate, and a first arc-guiding piece is welded to the lower end of the contact point to guide the electric arc.

3. The large-frame, low-current circuit breaker with an electromagnetic bimetallic composite structure according to claim 2, characterized in that: The stationary wiring assembly is provided with a stationary wiring plate, and the stationary wiring plate is provided with an insulating assembly. The insulating assembly includes an insulating element snapped onto one side of the stationary wiring plate and an insulating sheet covering the other side of the stationary wiring plate. The stationary wiring plate extends to the side where the contact plate is located through an insulating groove opened on the insulating element. The stationary wiring plate is provided with a stationary contact. The second moving contact on the moving contact is correspondingly provided with the stationary contact, and a second arc-guiding piece is welded to the lower end of the contact point to guide the electric arc.

4. The large-frame low-current circuit breaker with an electromagnetic bimetallic composite structure according to claim 1, characterized in that: A rotating shaft is also attached to the magnetic yoke, and a traction rod is rotatably connected to the rotating shaft. One end of the traction rod has a U-shaped opening and is attached to the top rod, while the other end is positioned to correspond to the buckle plate on the operating mechanism.

5. The large-frame, low-current circuit breaker with an electromagnetic bimetallic composite structure according to claim 3, characterized in that: An arc-blocking plate is also installed on the housing, and the arc-blocking plate is located on the side of the moving contact corresponding to the stationary contact on the moving contact.

6. The large-frame, low-current circuit breaker with an electromagnetic bimetallic composite structure according to claim 1, characterized in that: The flexible connector is a copper braided wire.

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