Static contact arc extinguishing module of circuit breaker
Through the modular design of static contact arc extinguishing, the static contact, gas-producing arc extinguishing cover and arc extinguishing chamber are integrated, and the clamping coordination method is adopted to solve the problems of cumbersome assembly and poor arc extinguishing effect of existing DC circuit breakers, and improve the breaking ability and arc extinguishing performance of the circuit breaker.
Patent Information
- Application Number
- CN202422483390.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-10-14
AI Technical Summary
The design of the static contacts and arc extinguishing chambers of existing DC circuit breakers is unreasonable, resulting in cumbersome assembly, poor arc extinguishing effect, and weak breaking ability.
The static contact arc extinguishing modular design is adopted, including a static contact, an air-producing arc extinguishing cover, an arc extinguishing chamber and an arc-induced iron plate. The static contact adopts a U-shaped contact part, and the U-shaped shielding part of the arc-induced iron plate is inserted into the U-shaped contact part. The gas-producing passage is connected to the arc extinguishing chamber and is assembled by means of a clamping coupling.
The modular assembly of static contacts and base is realized, which improves assembly efficiency, avoids electromagnetic repulsion interference, enhances arc extinguishing effect, and improves the breaking ability of the circuit breaker.
Smart Images
Figure CN223193742U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to a static contact arc extinguishing module of a circuit breaker. Background Art
[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions, and closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. Circuit breakers provide overload, short-circuit, and undervoltage protection, protecting lines and power equipment from damage. They also protect against fire hazards caused by long-standing ground faults that overcurrent protection cannot detect. A circuit breaker comprises a base, a top cover, an operating mechanism, a moving contact, a stationary contact, and an arc extinguishing chamber. Existing DC circuit breakers have an unreasonable structural design, with the stationary contact and arc extinguishing chamber unable to be integrated and modularized, making assembly cumbersome. Furthermore, these DC circuit breakers exhibit poor arc extinguishing performance, resulting in a weak breaking capacity. Summary of the Invention
[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a static contact arc extinguishing module with simple structure, stable and reliable performance, high assembly efficiency, good arc extinguishing effect, and the ability to effectively improve the breaking capacity of the circuit breaker.
[0004] To achieve the above-mentioned purpose, the utility model adopts a static contact arc extinguishing module of a circuit breaker, comprising a static contact arranged in a base, a gas-generating arc extinguishing hood covering the static contact, an arc extinguishing chamber arranged on the gas-generating arc extinguishing hood, and an arc-striking iron sheet. One end of the static contact has a wiring hole extending outside the gas-generating arc extinguishing hood, the other end of the static contact has a U-shaped contact portion extending into the gas-generating arc extinguishing hood, one end of the arc-striking iron sheet has a U-shaped shielding portion inserted into the U-shaped contact portion, the other end of the arc-striking iron sheet has an arc-striking angle extending into the arc extinguishing chamber, the gas-generating arc extinguishing hood is provided with a gas-generating channel through which a moving contact can pass, the U-shaped contact portion is provided with a static contact extending into the gas-generating channel, and the gas-generating channel is communicated with the arc extinguishing cavity of the arc extinguishing chamber.
[0005] The beneficial effects of the above structure are: the static contact and the gas-generating arc extinguishing cover, arc extinguishing chamber, and arc-striking iron sheet are integrated into a modular structural design, thereby realizing the modular assembly of the static contact arc extinguishing module and the base, and the static contact adopts a U-shaped contact structure design, and the U-shaped shielding part of the arc-striking iron sheet is inserted into the U-shaped contact part, which can avoid interference with the electromagnetic repulsion of the U-shaped contact part, thereby ensuring the electromagnetic repulsion of the static contact, which is beneficial to improving the breaking capacity of the circuit breaker, and the arc-striking angle of the arc-striking iron sheet can quickly introduce the arc into the arc extinguishing chamber, which is beneficial to the extinguishing of the arc, so that the static contact arc extinguishing module of the circuit breaker has the advantages of simple structure, stable and reliable performance, high assembly efficiency, good arc extinguishing effect, and can effectively improve the breaking capacity of the circuit breaker.
[0006] Specifically, the base is provided with a positioning boss, and the U-shaped contact portion and the U-shaped shield portion are respectively provided with a snap-fitting hole that cooperates with the positioning boss. The positioning boss is inserted into the snap-fitting hole, forming a snap-fitting engagement between the positioning boss, the U-shaped contact portion, and the U-shaped shield portion. The U-shaped contact portion and the U-shaped shield portion snap onto the positioning boss of the base, thereby facilitating assembly of the U-shaped contact portion, the U-shaped shield portion, and the base, and improving assembly efficiency.
[0007] Specifically, the gas-generating arc-extinguishing hood is equipped with an isolation hood that covers the arc-extinguishing chamber. One end of the isolation hood has an insert portion, and the gas-generating arc-extinguishing hood is provided with a slot that mates with the insert portion. The insert portion is inserted into the slot, forming a snap-fit connection between the isolation hood and the gas-generating arc-extinguishing hood. The isolation hood provides isolation, preventing arc runaway and improving the arc extinguishing performance of the static contact arc-extinguishing module.
[0008] In particular, the isolation cover has an isolation groove that connects to the gas generation channel and the arc extinguishing chamber. The upper ends of the two arc chute plates of the arc extinguishing chamber are respectively inserted into the isolation groove, forming a snap-fit connection between the isolation cover and the arc chute plates. This snap-fit connection facilitates assembly of the isolation cover and the arc chute, thereby improving assembly efficiency.
[0009] In particular, the gas-generating arc-extinguishing hood is provided with a snap-fit groove on either side. The lower ends of the two arc-isolating plates of the arc-extinguishing chamber are inserted into the snap-fit grooves, thereby forming a snap-fit connection between the gas-generating arc-extinguishing hood and the two arc-isolating plates. The snap-fit connection between the two arc-isolating plates of the arc-extinguishing chamber and the gas-generating arc-extinguishing hood facilitates assembly of the gas-generating arc-extinguishing hood and the arc-extinguishing chamber, thereby improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a cross-sectional view of a circuit breaker according to an embodiment of the present invention.
[0011] Figure 2 This is a three-dimensional diagram of an embodiment of the present utility model.
[0012] Figure 3 This is an exploded view of an embodiment of the present utility model.
[0013] Figure 4 This is a cross-sectional view of an embodiment of the present invention. DETAILED DESCRIPTION
[0014] like Figures 1 to 4As shown, the embodiment of the utility model is a static contact arc extinguishing module of a circuit breaker, comprising a static contact 11 arranged in a base 10, a gas-generating arc extinguishing cover 12 covering the static contact 11, an arc extinguishing chamber 13 arranged on the gas-generating arc extinguishing cover 12, and an arc-striking iron sheet 14. One end of the static contact 11 has a wiring hole 111 extending outside the gas-generating arc extinguishing cover 12, and the other end of the static contact 11 has a U-shaped contact portion 112 extending inside the gas-generating arc extinguishing cover 12. One end of the arc-striking iron sheet 14 has a U-shaped shielding portion 141 inserted into the U-shaped contact portion 112, and the other end of the arc-striking iron sheet 14 has an arc-striking angle 142 extending into the arc extinguishing chamber 13. The gas-generating arc-extinguishing cover 12 is provided with a gas-generating channel 121 for the moving contact to pass through, and the U-shaped contact portion 112 is provided with a static contact 113 extending into the gas-generating channel 121. The gas-generating channel 121 is connected to the arc-extinguishing cavity 131 of the arc-extinguishing chamber 13.
[0015] like Figure 1 As shown, the base 10 is provided with a positioning boss 101, and the U-shaped contact portion 112 and the U-shaped shield portion 141 are respectively provided with a snap-fitting hole 100 that cooperates with the positioning boss 101. The positioning boss 101 is inserted into the snap-fitting hole 100, forming a snap-fitting engagement between the positioning boss 101, the U-shaped contact portion 112, and the U-shaped shield portion 141. The U-shaped contact portion and the U-shaped shield portion snap onto the positioning boss of the base, thereby facilitating the assembly of the U-shaped contact portion, the U-shaped shield portion, and the base, and improving assembly efficiency.
[0016] like Figure 1 、 3 As shown in Figures 4 and 5, the gas-generating arc-extinguishing hood 12 is provided with an isolation hood 15 that covers the arc-extinguishing chamber 13. One end of the isolation hood 15 has an insert portion 151. The gas-generating arc-extinguishing hood 12 is provided with a slot 122 that mates with the insert portion 151. The insert portion 151 is inserted into the slot 122, forming a snap-fit connection between the isolation hood 15 and the gas-generating arc-extinguishing hood 12. The isolation hood serves as an isolation device, preventing arcing and improving the arc-extinguishing performance of the static contact arc-extinguishing module. The isolation hood 15 has an isolation slot 152 that communicates with the gas-generating channel 121 and the arc-extinguishing chamber 131. The upper ends of the two arc-extinguishing chute plates 132 of the arc-extinguishing chamber 12 are inserted into the isolation slot 152, forming a snap-fit connection between the isolation hood 15 and the arc-extinguishing chute plates 132. The snap-fit connection between the isolation hood and the arc-extinguishing chute facilitates assembly of the isolation hood and the arc-extinguishing chamber, increasing assembly efficiency. The gas-generating arc-extinguishing hood 12 is provided with a snap-fit groove 123 on both sides. The lower ends of the two arc-isolating plates 132 of the arc-extinguishing chamber 13 are inserted into the snap-fit grooves 123, thereby forming a snap-fit connection between the gas-generating arc-extinguishing hood 12 and the two arc-isolating plates 132. The snap-fit connection between the two arc-isolating plates of the arc-extinguishing chamber and the gas-generating arc-extinguishing hood facilitates assembly of the gas-generating arc-extinguishing hood and the arc-extinguishing chamber, thereby improving assembly efficiency.
[0017] The static contact is integrated with the gas-generating arc extinguishing cover, arc extinguishing chamber, and arc-striking iron sheet in a modular structural design, thereby realizing modular assembly of the static contact arc extinguishing module and the base. The static contact adopts a U-shaped contact structure design, and the U-shaped shielding portion of the arc-striking iron sheet is inserted into the U-shaped contact portion, which can avoid interference with the electromagnetic repulsion of the U-shaped contact portion, thereby ensuring the electromagnetic repulsion of the static contact, which is beneficial to improving the breaking capacity of the circuit breaker. The arc-striking angle of the arc-striking iron sheet can quickly introduce the arc into the arc extinguishing chamber, which is beneficial to the extinguishing of the arc. Therefore, the static contact arc extinguishing module of the circuit breaker has the advantages of simple structure, stable and reliable performance, high assembly efficiency, good arc extinguishing effect, and can effectively improve the breaking capacity of the circuit breaker.
Claims
1. A static contact arc extinguishing module for a circuit breaker, characterized in that: It includes a static contact arranged in the base, a gas-generating arc-extinguishing hood covering the static contact, an arc-extinguishing chamber arranged on the gas-generating arc-extinguishing hood, and an arc-striking iron sheet. One end of the static contact has a wiring hole extending outside the gas-generating arc-extinguishing hood, and the other end of the static contact has a U-shaped contact portion extending into the gas-generating arc-extinguishing hood. One end of the arc-striking iron sheet has a U-shaped shielding portion inserted into the U-shaped contact portion, and the other end of the arc-striking iron sheet has an arc-striking angle extending into the arc-extinguishing chamber. The gas-generating arc-extinguishing hood is provided with a gas-generating channel for the moving contact to pass through, and a static contact extending into the gas-generating channel is provided on the U-shaped contact portion. The gas-generating channel is connected to the arc-extinguishing cavity of the arc-extinguishing chamber.
2. The static contact arc extinguishing module of the circuit breaker according to claim 1, characterized in that: A positioning boss is provided in the base, and the U-shaped contact part and the U-shaped shielding part are respectively provided with snap-fit holes that match the positioning boss. The positioning boss is inserted into the snap-fit holes and constitutes a snap-fit fit between the positioning boss and the U-shaped contact part and the U-shaped shielding part.
3. The static contact arc extinguishing module of the circuit breaker according to claim 1 or 2, characterized in that: The gas-generating arc-extinguishing hood is provided with an isolation hood covering the arc-extinguishing chamber. One end of the isolation hood has an insert portion. The gas-generating arc-extinguishing hood is provided with a slot that matches the insert portion. The insert portion is inserted into the slot and constitutes a snap-fit fit between the isolation hood and the gas-generating arc-extinguishing hood.
4. The static contact arc extinguishing module of the circuit breaker according to claim 3, characterized in that: The isolation cover has an isolation groove connected to the gas production channel and the arc extinguishing chamber. The upper ends of the two arc extinguishing chute plates of the arc extinguishing chamber are respectively inserted into the isolation groove, and form a snap-fit fit between the isolation cover and the arc extinguishing chute.
5. The static contact arc extinguishing module of the circuit breaker according to claim 1 or 2, characterized in that: The gas generating arc extinguishing hood is provided with clamping grooves on both sides respectively. The lower ends of the two arc isolation plates of the arc extinguishing chamber are inserted into the clamping grooves, and constitute the clamping fit between the gas generating arc extinguishing hood and the two arc isolation plates.