Arc extinguishing system of universal circuit breaker
By designing a gas-generating plate for pressurized arc extinguishing and a gas-blocking structure in a universal circuit breaker, the problems of slow arc extinguishing speed and arc overflow were solved, achieving rapid arc extinguishing and improved circuit breaker safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FATO MECHANICAL & ELECTRICAL
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-05
AI Technical Summary
Existing universal circuit breaker arc extinguishing systems have slow arc extinguishing speeds and severe arc overflow, leading to increased internal temperatures and even breakdown of internal components.
An arc extinguishing system was designed, comprising a housing, an arc extinguishing chamber, an anti-ionization component, and an arc-initiating plate. The system utilizes a gas-generating plate to pressurize the gas, rapidly extinguishing the arc, and uses a gas-blocking component to prevent the gas from overflowing behind the moving contact, thus avoiding the arc from damaging the internal components.
It enables rapid extinction of electric arcs, reduces arc flashover, improves the safety and reliability of circuit breakers, and avoids damage to internal components.
Smart Images
Figure CN224204082U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to the arc extinguishing system of a universal circuit breaker. Background Technology
[0002] A universal circuit breaker, also known as a frame circuit breaker, is a mechanical switching device capable of connecting, carrying, and disconnecting current under normal circuit conditions, as well as connecting, carrying, and disconnecting current for a specified time under specified abnormal circuit conditions. Universal circuit breakers are used to distribute electrical energy and protect lines and power supply equipment from overload, undervoltage, and short circuits.
[0003] The existing universal circuit breaker's arc extinguishing system consists of an arc extinguishing chamber and arc-starting plates. The arc extinguishing chamber is composed of two arc-isolating plates and multiple arc-extinguishing grid plates. Because a large number of electric arcs are generated during the opening and closing of the circuit breaker, and the speed of the electric arcs is relatively fast, the arc-extinguishing grid plates of the arc extinguishing system cannot extinguish the electric arcs quickly, resulting in severe arcing. Some of the electric arcs will overflow from the arc extinguishing system and continue to move inside the circuit breaker, causing the internal temperature of the circuit breaker to rise abnormally, and even causing the internal components of the circuit breaker to break down. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of existing technologies and provide a universal circuit breaker arc extinguishing system that can effectively solve the problems of slow arc extinguishing speed and severe arc flash.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An arc-extinguishing system for a universal circuit breaker includes a housing, an arc-extinguishing chamber disposed within the housing's accommodating cavity, an anti-ionization component disposed on the arc-extinguishing chamber's outlet, and an arc-inducing plate disposed on the arc-extinguishing chamber at the corresponding moving contact. The arc-extinguishing chamber includes two arc-isolation plates and multiple arc-extinguishing grids disposed between the two arc-isolation plates, forming an arc-extinguishing channel between the multiple arc-extinguishing grids. Two gas-generating plates are disposed on the inner walls of the two arc-isolation plates at the arc-extinguishing chamber's inlet, forming a gas-generating channel connected to the arc-extinguishing channel between the two gas-generating plates. A lower gas-blocking component is disposed within the housing's accommodating cavity, separating the moving contact's conductive copper busbar from the stationary contact. An upper gas-blocking component is linkedly disposed on the moving contact, separating the lower gas-blocking component from the conductive copper busbar. An arc-extinguishing cavity connected to the gas-generating channel is formed between the lower gas-blocking component, the upper gas-blocking component, and the arc-extinguishing chamber.
[0006] In some embodiments, the deionization component includes a fixed base and a support plate, a deionization mesh plate and a cover plate disposed on two arc-blocking plates at the corresponding arc-extinguishing chamber outlet. The fixed base is provided with a through hole communicating with the arc-extinguishing channel. The support plate and the deionization mesh plate are stacked sequentially in the through hole. The cover plate is disposed on the fixed base and covers the deionization mesh plate. The support plate is provided with multiple air holes communicating with the arc-extinguishing channel. The deionization mesh plate is provided with multiple mesh holes communicating with the multiple air holes. The cover plate is provided with multiple exhaust holes communicating with the multiple mesh holes.
[0007] In some embodiments, the housing is provided with a cover that covers the cover plate, the cover is provided with a vent cavity that communicates with the exhaust port, and the cover is provided with a plurality of vent holes on both sides corresponding to the exhaust port of the cover plate.
[0008] In some embodiments, one end of the arc-initiating plate has an arc-initiating portion connected to the fixed base and covering multiple arc-extinguishing grid plates, and the other end of the arc-initiating plate has a bent portion extending toward the air inlet of the arc-extinguishing chamber, and the tail of the bent portion has an arc-initiating angle close to the moving contact.
[0009] In some embodiments, a clamping groove is formed between the arc-leading angle and the bending portion, and a support block that engages with the clamping groove is provided between the two arc-blocking plates.
[0010] In some embodiments, the stationary contact is provided with an arc-initiating plate, one end of which is fixed inside the housing, and the other end of which has an arc-initiating straight plate portion that passes through the gas generation channel and extends below a plurality of arc-extinguishing grids.
[0011] In some embodiments, the arc-initiating straight plate is provided with a strip-shaped hole, which extends from the stationary contact towards the arc-extinguishing grid plate.
[0012] In some embodiments, the lower gas stop component is provided with a guide arc surface that matches the movement trajectory of the moving contact, and the upper gas stop component has a baffle plate that slides with the guide arc surface. The baffle plate of the upper gas stop component moves with the moving contact and slides back and forth on the guide arc surface.
[0013] In some embodiments, the upper baffle has two shielding plates extending on both sides of the moving contact of the moving contact, and a shielding space is formed between the two shielding plates and the partition plate.
[0014] In some embodiments, the two gas generating plates are respectively provided with a plurality of snap-fit posts, and the two arc-blocking plates are respectively provided with a plurality of snap-fit holes that cooperate with the plurality of snap-fit posts. The plurality of snap-fit posts of the two gas generating plates are respectively snapped into the plurality of snap-fit holes of the two arc-blocking plates.
[0015] The beneficial effects of this invention are as follows: The two gas-generating plates generate gas under the high temperature of the electric arc, pressurizing the arc-extinguishing chamber and creating a gas-blowing effect. This allows the electric arc to quickly enter the arc-extinguishing channel of the arc-extinguishing chamber, facilitating rapid arc extinguishing. Furthermore, the deionization component reduces residual free arc at the arc-extinguishing chamber outlet, preventing the free arc from puncturing the rear of the arc-extinguishing chamber and effectively reducing the occurrence of arc flashover. Additionally, the upper and lower gas-blocking components prevent gas from overflowing behind the moving contact, preventing the gas from guiding the arc to move behind the moving contact and effectively preventing the arc from puncturing the internal components of the circuit breaker. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.
[0017] Figure 1 This is a perspective view of the universal circuit breaker according to an embodiment of the present invention;
[0018] Figure 2 This is a cross-sectional view of the universal circuit breaker according to an embodiment of the present invention;
[0019] Figure 3 This is a perspective view of the arc extinguishing system according to an embodiment of the present invention;
[0020] Figure 4 This is an exploded view of the arc-extinguishing chamber according to an embodiment of the present invention;
[0021] Figure 5 This is a perspective view of the moving contact in an embodiment of the present invention. Detailed Implementation
[0022] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.
[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0024] The directional and positional terms used in this utility model, such as up, down, front, back, left, right, inside, outside, top, bottom, side, etc., are only for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.
[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments:
[0026] like Figure 2-5 As shown, an arc-extinguishing system for a universal circuit breaker includes a housing 1, an arc-extinguishing chamber 2 disposed within a cavity 100 of the housing 1, an arc-extinguishing component 3 disposed on the air outlet 201 of the arc-extinguishing chamber 2, and an arc-starting plate 5 disposed on the arc-extinguishing chamber 2 at a corresponding moving contact 4. The arc-extinguishing chamber 2 includes two arc-blocking plates 21 and a plurality of arc-extinguishing grids 22 disposed between the two arc-blocking plates 21. An arc-extinguishing channel 220 is formed between the plurality of arc-extinguishing grids 22. The inner walls of the two arc-blocking plates 21 correspond to the air inlet 20 of the arc-extinguishing chamber 2. Two gas-generating plates 23 are installed at two locations, forming a gas-generating channel 230 that communicates with the arc-extinguishing channel 220. A lower gas-blocking component 7 is installed within the accommodating cavity 100 of the housing 10, separating the moving contact 4 from the conductive copper busbar 41 and the stationary contact 6. An upper gas-blocking component 8 is installed on the moving contact 4, separating the lower gas-blocking component 7 from the conductive copper busbar 41. An arc-extinguishing chamber 1000, communicating with the gas-generating channel 230, is formed between the lower gas-blocking component 7, the upper gas-blocking component 8, and the arc-extinguishing chamber 2. Under the high temperature of the electric arc, the two gas-generating plates generate gas, pressurizing the arc-extinguishing chamber and creating a gas-blowing effect. This allows the electric arc to quickly enter the arc-extinguishing channel of the arc-extinguishing chamber, facilitating rapid arc extinguishing. Furthermore, the deionization component reduces residual free arc at the arc-extinguishing chamber outlet, preventing the free arc from puncturing the rear of the arc-extinguishing chamber and effectively reducing the occurrence of arc flashover. Furthermore, the upper and lower gas-blocking components can prevent gas from overflowing behind the moving contact, thus preventing the gas from guiding the arc to move behind the moving contact and effectively preventing the arc from damaging the internal components of the circuit breaker.
[0027] like Figure 2 and 4As shown, the deionization component 3 includes a fixed base 31, a support plate 32, a deionization mesh plate 33, and a cover plate 34, which are installed on two arc-blocking plates 21 at the corresponding air outlet 201 of the arc-extinguishing chamber 2. The fixed base 31 is provided with a through hole 310 that communicates with the arc-extinguishing channel 220. The support plate 32 and the deionization mesh plate 33 are stacked in sequence in the through hole 310. The cover plate 34 is installed on the fixed base 31 and covers the deionization mesh plate 33. The support plate 32 is provided with multiple air holes 321 that communicate with the arc-extinguishing channel 220. The deionization mesh plate 33 is provided with multiple mesh holes 331 that communicate with the multiple air holes 321. The cover plate 34 is provided with multiple exhaust holes 341 that communicate with the multiple mesh holes 331. The ionization elimination component adopts an intermittent ionization elimination structure design. The ionized arc at the outlet of the arc-extinguishing chamber is cooled and extinguished sequentially by passing through the support plate and the ionization elimination mesh plate, preventing the arc from penetrating the rear of the arc-extinguishing chamber and effectively reducing the occurrence of flashover. The ionization elimination component adopts a modular structure design, which facilitates modular assembly of the ionization elimination component and the two arc-isolating plates, resulting in higher assembly efficiency. A cover 11 is provided on the housing 1, covering the cover plate 34. A vent chamber 111 connected to the exhaust port 341 is provided inside the cover 11. Multiple vent holes 112 are respectively provided on both sides of the cover 11 corresponding to the exhaust port 341 of the cover plate 34. The vent holes are located on both sides of the cover, so that the cover can discharge the high-temperature gas inside the circuit breaker from the side, avoiding the high-temperature gas from being directly sprayed onto the operators or nearby equipment, thus improving safety. One end of the arc-initiating plate 5 has an arc-initiating portion 51 connected to the fixed base 31 and covering multiple arc-extinguishing grid plates 22. The other end of the arc-initiating plate 5 has a bent portion 52 extending towards the air inlet 202 of the arc-extinguishing chamber 2. The tail of the bent portion 52 has an arc-initiating angle 53 close to the moving contact 4. The arc-initiating angle of the arc-initiating plate can quickly introduce the arc at the moving contact into the arc-extinguishing chamber, which is conducive to the rapid extinguishing of the arc and avoids the arc burning the moving contact. A clamping groove 500 is formed between the arc-initiating angle 53 and the bent portion 52. A support block 54 is provided between the two arc-blocking plates 21 and engages in the clamping groove 500. The clamping groove 500 is V-shaped, and the cross-sectional shape of the support block 54 matches the clamping groove 500. The two ends of the support block 54 are fixed to the two arc-blocking plates 21 by screws. The support block provides support and reinforcement for the arc-starting plate, which helps to improve the overall strength of the arc-starting plate and facilitates the assembly of the arc-starting plate with the two arc-blocking plates, making assembly more convenient.
[0028] like Figure 2 , 3As shown, an arc-initiating plate 61 is provided on the stationary contact 6. One end of the arc-initiating plate 61 is fixed inside the housing 1, and the other end of the arc-initiating plate 61 has an arc-initiating straight plate portion 611 that passes through the gas generation channel 230 and extends below multiple arc-extinguishing grid plates 22. The arc-initiating plate can quickly introduce the electric arc at the stationary contact into the arc-extinguishing chamber, which is conducive to the rapid extinguishing of the electric arc and can prevent the electric arc from burning the stationary contact. A strip-shaped hole 612 is provided on the arc-initiating straight plate portion 611, which extends from the stationary contact 6 towards the arc-extinguishing grid plates 22. The strip-shaped hole divides the electric arc into multiple short arcs connected in series, which can reduce the electric arc energy. Moreover, the strip-shaped hole, in conjunction with the airflow direction, is conducive to the electric arc quickly entering the arc-extinguishing chamber and accelerating its extinguishing. The lower gas-blocking component 7 is provided with a guide arc surface 71 that matches the movement trajectory of the moving contact 4. The upper gas-blocking component 8 has a baffle plate 81 that slides in cooperation with the guide arc surface 71. The baffle plate 81 of the upper gas-blocking component 8 moves with the moving contact 4 and slides back and forth on the guide arc surface 71. The baffle plate of the upper gas-blocking component slides with the moving contact on the guide arc surface of the lower gas-blocking component, thereby ensuring that the lower and upper gas-blocking components can reliably prevent gas from entering behind the moving contact and avoid arcing that could damage the internal components of the circuit breaker.
[0029] like Figure 5 As shown, the upper baffle 8 has two baffle plates 82 extending on both sides of the moving contact 40 of the moving contact 4, and a baffle space 800 is formed between the two baffle plates 82 and the partition plate 81. When the moving contact and the stationary contact are connected, the baffle space can cover the moving contact and the stationary contact, thereby preventing the electric arc from entering behind the moving contact and preventing the electric arc from damaging the internal components of the circuit breaker.
[0030] like Figure 4 As shown, each of the two gas-generating plates 23 has multiple locking posts 231, and each of the two arc-blocking plates 21 has multiple locking holes 211 that mate with the locking posts 231. The locking posts 231 of the two gas-generating plates 23 are respectively engaged within the locking holes 211 of the two arc-blocking plates 23. The two gas-generating plates are engaged with the two arc-blocking plates by the locking posts, which facilitates the assembly of the two gas-generating plates and the two arc-blocking plates and improves assembly efficiency.
[0031] The above description is only one embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model; the scope of protection of the present utility model is defined by the claims in the claims, and all equivalent changes and modifications made in accordance with the utility model are within the scope of protection of the present utility model patent.
Claims
1. An arc-extinguishing system for a universal circuit breaker, characterized in that: The device includes a housing, an arc-extinguishing chamber disposed within the housing cavity, an anti-ionization component disposed at the outlet of the arc-extinguishing chamber, and an arc-initiating plate disposed on the arc-extinguishing chamber at the corresponding moving contact. The arc-extinguishing chamber includes two arc-blocking plates and multiple arc-extinguishing grids disposed between the two arc-blocking plates, forming an arc-extinguishing channel between the multiple arc-extinguishing grids. Two gas-generating plates are disposed on the inner walls of the two arc-blocking plates at the air inlet of the arc-extinguishing chamber, forming a gas-generating channel between the two gas-generating plates and communicating with the arc-extinguishing channel. A lower gas-blocking component is disposed within the housing cavity, separating the conductive copper busbar of the moving contact from the stationary contact. An upper gas-blocking component is disposed on the moving contact, separating the lower gas-blocking component from the conductive copper busbar. An arc-extinguishing cavity is formed between the lower gas-blocking component, the upper gas-blocking component, and the arc-extinguishing chamber, communicating with the gas-generating channel.
2. The arc-extinguishing system of the universal circuit breaker according to claim 1, characterized in that: The aforementioned deionization component includes a fixed base, a support plate, a deionization mesh plate, and a cover plate, all mounted on two arc-blocking plates at the corresponding arc-extinguishing chamber outlet. The fixed base has a through hole communicating with the arc-extinguishing channel. The support plate and the deionization mesh plate are stacked sequentially within the through hole. The cover plate is mounted on the fixed base and covers the deionization mesh plate. The support plate has multiple air holes communicating with the arc-extinguishing channel. The deionization mesh plate has multiple mesh holes communicating with the multiple air holes. The cover plate has multiple exhaust holes communicating with the multiple mesh holes.
3. The arc-extinguishing system of the universal circuit breaker according to claim 2, characterized in that: The housing is provided with a cover that covers the cover plate. The cover is provided with a vent chamber that communicates with the exhaust port. The cover is provided with multiple vent holes on both sides corresponding to the exhaust port of the cover plate.
4. The arc-extinguishing system of the universal circuit breaker according to claim 2 or 3, characterized in that: One end of the arc-inducing plate has an arc-inducing portion connected to the fixed base and covering multiple arc-extinguishing grid plates, and the other end of the arc-inducing plate has a bent portion extending towards the air inlet of the arc-extinguishing chamber. The tail of the bent portion has an arc-inducing angle close to the moving contact.
5. The arc-extinguishing system of the universal circuit breaker according to claim 3, characterized in that: A clamping groove is formed between the arc-leading angle and the bending part, and a support block that engages with the clamping groove is provided between the two arc-blocking plates.
6. The arc-extinguishing system of the universal circuit breaker according to claim 1, characterized in that: The stationary contact is provided with an arc-initiating plate. One end of the arc-initiating plate is fixed inside the housing, and the other end of the arc-initiating plate has an arc-initiating straight plate that passes through the gas generation channel and extends below multiple arc-extinguishing grids.
7. The arc-extinguishing system of the universal circuit breaker according to claim 6, characterized in that: The arc-initiating straight plate is provided with a strip-shaped hole, which extends from the stationary contact towards the arc-extinguishing grid plate.
8. The arc-extinguishing system of the universal circuit breaker according to claim 1, characterized in that: The lower gas stop component is provided with a guide arc surface that matches the movement trajectory of the moving contact, and the upper gas stop component has a baffle plate that slides with the guide arc surface. The baffle plate of the upper gas stop component moves with the moving contact and slides back and forth on the guide arc surface.
9. The arc-extinguishing system of the universal circuit breaker according to claim 8, characterized in that: The upper baffle has two baffles extending on both sides of the moving contact of the moving contact, and a baffle space is formed between the two baffles and the partition plate.
10. The arc-extinguishing system of the universal circuit breaker according to claim 1, characterized in that: The two gas-generating plates are each provided with multiple snap-fit posts, and the two arc-blocking plates are each provided with multiple snap-fit holes that cooperate with the multiple snap-fit posts. The multiple snap-fit posts of the two gas-generating plates are respectively snapped into the multiple snap-fit holes of the two arc-blocking plates.