High-breaking AC / DC universal miniature circuit breaker
By adopting a U-shaped magnetic parallel structure and a magnetic blowing mechanism generated by inert gas in the circuit breaker, the problem of poor arc extinguishing performance of DC circuit breakers is solved, and rapid arc extinguishing and high breaking capacity are achieved, which is suitable for AC and DC circuits.
Patent Information
- Application Number
- CN202422891989.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing DC circuit breakers have problems in arc extinguishing performance, such as poor arc guidance, long arc extinguishing time, and poor arc extinguishing effect, resulting in weak breaking capacity.
The magnetic blowing mechanism with U-shaped parallel magnetic structure is combined with U-shaped insulating sleeve and plasma cutting iron sheet to cut the arc through magnetic field and generate inert gas during the arc operation to enhance the arc extinguishing ability.
It realizes the rapid extinction of arc, improves the breaking capacity of circuit breaker, shortens the disconnection time, enhances arc extinguishing performance, prolongs the service life of contacts, and is suitable for AC and DC circuits.
Smart Images
Figure CN223462187U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a circuit breaker technical field, concretely relates to a high breaking AC / DC universal miniature circuit breaker. BACKGROUND
[0002] Miniature circuit breaker is also called micro circuit breaker, which is suitable for AC 50 / 60Hz rated voltage 230 / 400V and rated current not more than 125A line overload and short circuit protection, and can also be used as infrequent operation conversion of line under normal circumstances. Miniature circuit breaker is mainly used in industry, commerce, high-rise and residential buildings and various places. DC miniature circuit breaker should have high breaking capacity when short circuit occurs, which can cut off short circuit fault current in time.
[0003] Miniature DC circuit breaker and miniature AC circuit breaker have significant difference in arc extinguishing performance, and the main reason is that their working principles and arc characteristics are different. 1. AC circuit breaker: each cycle of AC has natural zero point, and arc is easy to extinguish at zero point. Therefore, AC circuit breaker uses this characteristic to disconnect circuit through arc extinguishing mechanism, so that arc extinguishing is relatively easy. 2. DC circuit breaker: DC has no natural zero point, and DC arc is constant, the greater the current, the greater the time constant, and the more difficult the arc is to extinguish. Therefore, DC circuit breaker needs additional arc extinguishing device to enhance arc extinguishing capacity, and usually controls switch to cut off current, which makes arc extinguishing process more complex and difficult. However, the existing DC circuit breaker usually adopts arc extinguishing mode of introducing generated arc into arc chamber through arc guide sheet for arc extinguishing, and has defects such as weak arc guiding property, long arc extinguishing time and poor arc extinguishing effect, which causes weak breaking capacity of circuit breaker. SUMMARY
[0004] The utility model aims at overcoming the defects of prior art, and provides a high breaking AC / DC universal miniature circuit breaker with simple structure, stable and reliable performance, convenient assembly and long service life.
[0005] In order to achieve the above-mentioned purpose, the utility model adopts a high breaking AC / DC universal miniature circuit breaker, which comprises a shell, an operating mechanism, a movable contact cooperating with the operating mechanism, a static contact cooperating with the movable contact, and an arc chamber. A magnetic blow mechanism is arranged in the shell corresponding to the movable contact. The magnetic blow mechanism comprises a U-shaped insulating sleeve arranged in the shell, a U-shaped iron sheet arranged in the U-shaped insulating sleeve, and a magnetic conducting piece arranged on the U-shaped insulating sleeve. One side of the U-shaped insulating sleeve has a U-shaped groove accommodating the movable contact. One end of the magnetic conducting piece has a magnetic conducting part extending into the U-shaped groove. Two plasma cutting iron sheets are arranged on the outer wall of the U-shaped insulating sleeve corresponding to the two sides of the movable contact.
[0006] The beneficial effect of the above structure is that the magnetic blowing mechanism adopts a U-shaped magnetic conducting parallel structure design, and the magnetic field generated by the U-shaped iron sheet cuts the arc during the movement of the arc. The U-shaped insulation sleeve is integrally formed by pouring a gas generating material, which increases the inert gas and enhances the cooling effect, and protects the insulation guarantee of the minimum safety gap of the circuit breaker. The combination of the U-shaped iron sheet and the U-shaped insulation sleeve can achieve better gas blowing effect, so that a strong gas jet can be formed at the outlet of the U-shaped groove, so that the arc can quickly enter the arc extinguishing chamber to achieve rapid extinction of the arc, which is beneficial to improve the breaking capacity of the circuit breaker. Since the blowing mechanism adopts a non-fully closed U-shaped structure design, plasma cutting iron sheets are arranged on both sides of the U-shaped insulation sleeve, so that the problem of uneven magnetic lines and magnetic field caused by magnetic leakage can be avoided, and the magnetic attraction of the magnetic conducting part can be increased. At the critical breaking current, the opening time of the circuit breaker can be greatly shortened. Therefore, the small circuit breaker has the advantages of simple structure, stable and reliable performance, convenient assembly, long service life, high breaking, and AC / DC universal.
[0007] In particular, the housing is provided with a U-shaped magnetic conducting sheet attached to one side of the static contact, and the groove of the U-shaped magnetic conducting sheet is provided with an insulating isolation sheet. The U-shaped magnetic conducting sheet of the U-shaped integrated structure design is arranged on the static contact, a batch of gas generating insulating isolation sheets are placed in the middle of the U-shaped magnetic conducting sheet for isolation, and the U-shaped magnetic conducting sheet and the static contact point of the static contact form a double-loop magnetic loop, which can generate more fine magnetic lines. When an accident such as short circuit occurs, a greater repulsive force can be generated to make the contact of the circuit breaker open more quickly and have stronger breaking capacity.
[0008] In particular, the static contact tail is provided with an arc guiding sheet, and one end of the arc guiding sheet is bent and extends into the arc extinguishing chamber. When the circuit breaker is opened to generate high temperature and high pressure, the arc guiding sheet can guide the arc to release pressure, ensuring that the arc operation can minimize the burning of the static contact point, and the high-temperature ionized electron gas is quickly transferred to the arc extinguishing chamber for division, cooling and arc extinguishing, thereby improving the arc extinguishing performance of the circuit breaker.
[0009] In particular, one gas generating plate is arranged on the dynamic contact corresponding to the two sides of the dynamic contact point. During the operation of the arc, the gas generating plate can generate more inert gas, and at the same time, the dynamic contact can be prevented from being burned by high temperature during the breaking process, which is beneficial to prolong the service life of the contact.
[0010] In particular, the height of the gas generating plate is greater than the height of the dynamic contact point, and the dynamic contact is provided with a rivet connected with the gas generating plate. The height of the gas generating plate is greater than the height of the dynamic contact point, which can avoid high-temperature ablation of the dynamic contact point and prolong the service life of the dynamic contact point.
[0011] In particular, the movable contact is provided with an arc-shaped clearance groove on the side facing the U-shaped insulating sleeve, which matches the magnetic pole. The arc-shaped clearance groove on the movable contact can reduce the distance between the magnetic pole and the movable contact, thereby facilitating the enhancement of the magnetic field strength at the movable contact.
[0012] In particular, the housing is provided with positioning grooves on either side of the U-shaped insulating sleeve. The U-shaped insulating sleeve engages within the positioning grooves, forming a snap-fit connection between the U-shaped insulating sleeve and the housing. The U-shaped insulating sleeve engages within the housing, thereby enabling modular assembly of the magnetic blowing mechanism and the housing, making assembly more convenient.
[0013] In particular, two arc-isolating plates are disposed within the housing on either side of the stationary contact. An arc-guiding channel is formed between the two arc-isolating plates, connecting the U-shaped slot and the arc-extinguishing chamber. The arc-guiding channel serves as a guide, ensuring that the gas jet from the U-shaped slot outlet quickly enters the arc-extinguishing chamber, thereby facilitating rapid arc extinguishing. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a cross-sectional view of an embodiment of the present invention.
[0015] Figure 2 This is a diagram of the internal structure of an embodiment of the present utility model.
[0016] Figure 3 It is a three-dimensional diagram of the magnetic blowing mechanism according to an embodiment of the present utility model.
[0017] Figure 4 This is a three-dimensional diagram of the moving contact of an embodiment of the present utility model. DETAILED DESCRIPTION
[0018] like Figures 1-4 As shown, an embodiment of the utility model is a high-breaking AC and DC universal miniature circuit breaker, comprising a housing 10, an operating mechanism 11, a moving contact 12 linked to the operating mechanism 11, a static contact 13 matched with the moving contact 12, and an arc extinguishing chamber 14. A magnetic blowing mechanism 20 is provided in the housing 10 corresponding to the moving contact 12. The magnetic blowing mechanism 20 includes a U-shaped insulating sleeve 21 provided in the housing 10, a U-shaped iron sheet 22 provided in the U-shaped insulating sleeve 21, and a magnetic conductive member 23 provided on the U-shaped insulating sleeve 21. One side of the U-shaped insulating sleeve 21 has a U-shaped groove 211 for accommodating the moving contact 12, and one end of the magnetic conductive member 23 has a magnetic conductive portion 231 extending in the U-shaped groove 211. Two plasma-cut iron sheets 24 are provided on the outer wall of the U-shaped insulating sleeve 21 corresponding to both sides of the moving contact 12.
[0019] like Figure 1 and 2As shown, the shell 10 is provided with a U-shaped magnetic conducting sheet 15 attached to one side of the static contact 13, and the groove 151 of the U-shaped magnetic conducting sheet 15 is provided with an insulating isolation sheet 16. The U-shaped magnetic conducting sheet is provided on the static contact in a U-shaped integrated structure, and a batch of gas-producing insulating isolation sheets are placed in the U-shaped magnetic conducting sheet for isolation. The U-shaped magnetic conducting sheet and the static contact point of the static contact form a double-loop magnetic loop, which can generate more fine magnetic lines, and can generate greater repulsive force when a short circuit or other accidents occur, so as to make the contact of the circuit breaker open more quickly and have stronger breaking capacity. The arc guiding sheet 17 is provided at the tail of the static contact 13, and one end of the arc guiding sheet 17 is bent and extends into the arc extinguishing chamber 14. When the circuit breaker is opened to generate high temperature and high pressure, the arc guiding sheet can guide the arc to release pressure, so as to ensure that the arc operation process is maximally reduced, the high-temperature ionized electron gas is quickly transferred to the arc extinguishing chamber for division, cooling and arc extinguishing, thereby improving the arc extinguishing performance of the circuit breaker.
[0020] As shown in Figure 2 and 4 , the dynamic contact 12 is provided with a gas production plate 18 on both sides of the dynamic contact point 121. In the arc operation process, the gas production plate can produce more inert gas, and at the same time, the dynamic contact is prevented from being burned by high temperature during the re-breaking process of the dynamic contact, which is beneficial to prolong the service life of the contact. The height of the gas production plate 18 is greater than the height of the dynamic contact point 121, and the dynamic contact 12 is provided with a rivet 181 connected with the gas production plate 18. The height of the gas production plate is greater than the height of the dynamic contact point, which can avoid high-temperature ablation of the dynamic contact, and is beneficial to prolong the service life of the dynamic contact. The dynamic contact 12 is provided with an arc-shaped accommodation groove 122 on the side facing the U-shaped insulating sleeve 21, which cooperates with the magnetic pole 231. The arc-shaped accommodation groove is provided on the dynamic contact, which can reduce the distance between the magnetic pole and the dynamic contact, thereby enhancing the magnetic field strength of the dynamic contact. The shell 10 is provided with a positioning groove 101 on both sides of the U-shaped insulating sleeve 21, and the U-shaped insulating sleeve 21 is clamped in the positioning groove 101, and the clamping cooperation between the U-shaped insulating sleeve 21 and the shell 10 is formed. The U-shaped insulating sleeve is clamped in the shell, so that the modular assembly of the magnetic blowing mechanism and the shell can be realized, and the assembly is more convenient. The shell 10 is provided with two arc separation plates 19 on both sides of the static contact 13, and the two arc separation plates 19 form an arc guiding channel 190 which is connected between the U-shaped groove 211 and the arc extinguishing chamber 14. The arc guiding channel can play a guiding role, so that the gas jet at the outlet of the U-shaped groove can quickly enter the arc extinguishing chamber, thereby facilitating the rapid extinction of the arc.
[0021] The magnetic blowing mechanism adopts U-shaped magnetic conductive parallel structure design. During the movement of the arc, the magnetic field generated by the U-shaped iron sheet cuts the arc. The U-shaped insulation sleeve is made of a gas generating material and is poured into an integrated structure. The U-shaped insulation sleeve increases the inert gas and enhances the cooling effect, while protecting the insulation guarantee of the electrical minimum safety gap of the circuit breaker. The combination of the U-shaped iron sheet and the U-shaped insulation sleeve can achieve better gas blowing effect, thereby forming a strong gas jet at the outlet of the U-shaped groove, so that the arc can quickly enter the arc extinguishing chamber, achieving rapid extinction of the arc, which is beneficial to improve the breaking capacity of the circuit breaker. Due to the non-fully closed U-shaped structure design of the blowing mechanism, plasma cutting iron sheets are arranged on both sides of the U-shaped insulation sleeve, thereby avoiding the problem of uneven magnetic lines and magnetic field caused by magnetic leakage. The magnetic conductive part of the magnetic conductive part can increase the magnetic attraction force, which can greatly shorten the opening time of the circuit breaker at the critical breaking current. Therefore, the small circuit breaker has the advantages of simple structure, stable and reliable performance, convenient assembly, long service life, high breaking, and AC / DC universal.
Claims
1. A high breaking AC / DC general purpose miniature circuit breaker comprising a housing, an operating mechanism, a movable contact cooperating with the operating mechanism, a stationary contact cooperating with the movable contact, an arc chute, characterized in that: The magnetic blow mechanism is arranged at the corresponding moving contact in the shell, and comprises a U-shaped insulation sleeve arranged in the shell, a U-shaped iron sheet arranged in the U-shaped insulation sleeve, and a magnetic conducting member arranged on the U-shaped insulation sleeve.
2. The high breaking AC / DC general-purpose miniature circuit breaker according to claim 1, characterized in that: The U-shaped magnetic conducting sheet is arranged in the shell and is attached to one side of the static contact.
3. The high breaking AC / DC universal miniature circuit breaker according to claim 1 or 2, characterized in that: The arc conducting sheet is arranged on the tail of the static contact and is bent at one end to extend into the arc extinguishing chamber.
4. The high breaking AC / DC universal miniature circuit breaker according to claim 1 or 2, characterized in that: The moving contact is provided with a gas generating plate on each side of the moving contact point.
5. The high breaking AC / DC universal miniature circuit breaker according to claim 4, characterized in that: The height of the gas generating plate is greater than the height of the moving contact point, and the moving contact is provided with a rivet connected to the gas generating plate.
6. The high breaking AC / DC universal miniature circuit breaker according to claim 1 or 2, characterized in that: The moving contact is provided with an arc-shaped accommodation slot on the side facing the U-shaped insulation sleeve.
7. The high breaking AC / DC universal miniature circuit breaker according to claim 1 or 2, characterized in that: The shell is provided with positioning grooves on both sides of the U-shaped insulation sleeve, the U-shaped insulation sleeve is clamped in the positioning grooves, and the U-shaped insulation sleeve and the shell are clamped and matched.
8. The high breaking AC / DC universal miniature circuit breaker according to claim 1 or 2, characterized in that: The shell is provided with two arc separating plates on both sides of the static contact, and the two arc separating plates form an arc conducting channel connected between the U-shaped groove and the arc extinguishing chamber.