CN216288285U - Arc extinguishing system and circuit breaker - Google Patents
Arc extinguishing system and circuit breaker Download PDFInfo
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- CN216288285U CN216288285U CN202121613293.2U CN202121613293U CN216288285U CN 216288285 U CN216288285 U CN 216288285U CN 202121613293 U CN202121613293 U CN 202121613293U CN 216288285 U CN216288285 U CN 216288285U
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Abstract
The utility model provides an arc extinguishing system and a circuit breaker, wherein the circuit breaker is provided with the arc extinguishing system, the arc extinguishing system comprises an arc extinguishing chamber and a contact mechanism positioned on one side of the arc extinguishing chamber, the contact mechanism comprises a fixed contact and a moving contact, and the fixed contact and the moving contact are arranged oppositely; the arc extinguishing chamber also comprises a lower arc runner below the arc extinguishing chamber; the static contact comprises an arc striking part, one end of the arc striking part is provided with a static contact, and the other end of the arc striking part extends to an arc inlet of the arc extinguishing chamber; permanent magnets are arranged at least one of the positions of one side of the arc extinguish chamber facing the contact mechanism, between the fixed contact and the movable contact, at the arc striking part and at the position close to the lower arc runner; according to the method, the permanent magnet is not arranged in the front area of the whole grid piece, so that the loss of magnetism of the permanent magnet caused by high temperature of electric arc is avoided while the cost is saved, and the breaking capacity of the arc extinguish chamber is improved.
Description
Technical Field
The utility model relates to the field of low-voltage electrical appliances, in particular to an arc extinguishing system and a circuit breaker.
Background
With the development of an alternating current-direct current hybrid power distribution network and the grid connection of distributed energy, more rigorous requirements are put forward on the safety and reliability of the power distribution network. As a miniature circuit breaker for controlling and protecting a power distribution network terminal, the switching-on and switching-off performance of the miniature circuit breaker on short-circuit current and rated current greatly influences the safety of a power distribution network system, and more importantly, the miniature circuit breaker directly influences the safety of user equipment and the personal safety of users, so that the requirements on the switching-on and switching-off performance and the reliability of the circuit breaker are higher.
The arc extinguishing capability of the circuit breaker directly determines the opening capability of the circuit breaker. At present, the arc extinguishing capability of the circuit breaker is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide an arc extinguishing system and a circuit breaker with good arc extinguishing performance.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the embodiment of the application provides an arc extinguishing system, which comprises an arc extinguishing chamber and a contact mechanism positioned on one side of the arc extinguishing chamber, wherein the contact mechanism comprises a fixed contact and a movable contact, and the fixed contact and the movable contact are arranged oppositely; the arc extinguishing chamber also comprises a lower arc runner below the arc extinguishing chamber; the static contact comprises an arc-shaped arc striking part, and one end of the arc striking part extends to an arc inlet of the arc extinguishing chamber;
permanent magnets are arranged at least one of the positions of one side of the arc extinguish chamber facing the contact mechanism, between the fixed contact and the movable contact, at the arc striking part and at the arc inlet of the lower arc runner close to the arc extinguish chamber.
Preferably, the arc extinguishing chamber further comprises an upper arc runner positioned above the arc extinguishing chamber; one end of the upper arc runner is connected with the fixed contact.
Preferably, the arc extinguishing chamber further comprises iron sheets, the iron sheets are arranged on two sides of an arc inlet channel between an arc inlet of the arc extinguishing chamber and the contact mechanism, and the iron sheets are in contact fit with the permanent magnets.
Preferably, a permanent magnet is arranged between the fixed contact and the movable contact;
or permanent magnets are arranged between the static contact and the moving contact and at the arc striking part;
or permanent magnets are arranged at the arc striking part and the arc inlet of the lower arc runner close to the arc extinguishing chamber;
or permanent magnets are arranged between the fixed contact and the movable contact, at the arc striking part and at the arc inlet of the lower runway close to the arc extinguishing chamber.
Preferably, the permanent magnet between the fixed contact and the movable contact is in a rectangular shape, the permanent magnets between the fixed contact and the movable contact are multiple, and the multiple permanent magnets are respectively positioned on two sides of the contact mechanism and are stacked in the thickness direction of the arc extinguishing system;
and/or, the permanent magnet of striking department is the arc type, matches with the shape of striking department, and the permanent magnet of striking department is the polylith, and polylith permanent magnet is located contact mechanism's both sides respectively, is located the inboard of striking department, and stacks up the setting along arc extinguishing system's thickness direction.
Preferably, the permanent magnet close to the lower runner is in a cuboid shape and is arranged along the thickness direction of the arc extinguishing system.
Preferably, the permanent magnet is a plurality of blocks, and like magnetic poles of the plurality of permanent magnets are oppositely arranged.
Preferably, an arc striking chamber is formed among the moving contact, the fixed contact and the arc extinguishing chamber, the iron sheet is of a sheet structure, and the shape of the iron sheet is matched with that of the arc striking chamber.
Preferably, the side edge of the upper part of the iron sheet is horizontally straight and is positioned below the contact of the static contact, and the side edge of the lower part of the iron sheet is a bevel edge corresponding to and matched with the lower arc runner.
The embodiment of the application also provides a circuit breaker, which comprises the arc extinguishing system.
The utility model provides an arc extinguishing system which comprises an arc extinguishing chamber and a contact mechanism positioned on one side of the arc extinguishing chamber, wherein the contact mechanism comprises a fixed contact and a movable contact which are arranged oppositely; the arc extinguishing chamber also comprises a lower arc runner below the arc extinguishing chamber; the static contact comprises an arc striking part, one end of the arc striking part is provided with a static contact, and the other end of the arc striking part extends to an arc inlet of the arc extinguishing chamber; permanent magnets are arranged at least one of the positions of one side of the arc extinguish chamber facing the contact mechanism, between the fixed contact and the movable contact, at the arc striking part and at the position close to the lower arc runner; according to the method, the permanent magnet is not arranged in the front area of the whole grid piece, so that the loss of magnetism of the permanent magnet caused by high temperature of electric arc is avoided while the cost is saved, and the breaking capacity of the arc extinguish chamber is improved.
When the permanent magnets are multiple, like magnetic poles of the multiple permanent magnets are oppositely arranged, so that the influence of the polarity of direct current can be avoided, the direct-current non-polarity on-off requirement can be realized, and the non-polarity refers to that an upper terminal can be led in and a lower terminal can be led out in the use process of the switch electric appliance, or vice versa.
Drawings
FIG. 1 is a schematic diagram of one embodiment of an arc extinguishing system of the present invention;
FIG. 2 is a schematic diagram of another embodiment of an arc extinguishing system of the present invention;
FIG. 3 is a schematic diagram of another embodiment of an arc extinguishing system of the present invention;
FIG. 4 is a schematic diagram of another embodiment of an arc extinguishing system of the present invention;
FIG. 5 is an arc current and arc voltage waveform after a single opening of the circuit breaker of the present invention;
fig. 6 is an arc voltage and arc current waveform for a first switch closing and opening operation after the circuit breaker of the present invention is opened once;
fig. 7 is an arc voltage and arc current waveform for a second switch closing and opening operation after the circuit breaker of the present invention is opened once.
Detailed Description
The following description will further describe an embodiment of the arc extinguishing system of the present invention with reference to the embodiments shown in fig. 1 to 4. The arc extinguishing system of the present invention is not limited to the description of the following embodiments.
The arc extinguishing ability of circuit breaker has directly decided the ability of opening of circuit breaker, and the explosion chamber structure plays crucial effect to circuit breaker arc extinguishing ability, especially to direct current circuit breaker, needs optimize the explosion chamber, makes it improve electric arc voltage more fast, and electric arc voltage is higher more does benefit to going out of electric arc. The existing method for modifying the arc extinguish chamber of the direct current breaker mainly has two aspects, on one hand, the gas blowing effect is enhanced, namely, a gas generating material is added, and under the high-temperature effect of an arc column, the gas generating material releases a large amount of gas, so that the pressure in the arc extinguish chamber is increased, an arc rapidly enters a grid plate, and the arc voltage is increased. On the other hand, a permanent magnet is added, the Lorentz force borne by the electric arc is increased by using the permanent magnet, and the electric arc is promoted to be cut by the grid plate, so that the electric arc voltage is improved. However, the use of a permanent magnet for a dc circuit breaker has a polarity influence, and if a permanent magnet is used in an area other than the entire grid, the cost increases. Therefore, in the dc miniature circuit breaker, in order to improve the breaking capability and the electrical life of the circuit breaker, the arrangement mode and the arrangement position of the permanent magnet in the arc extinguishing chamber need to be optimally designed.
The arc extinguishing system in the embodiment of the application can be applied to a circuit breaker, for example: direct current circuit breakers and alternating current circuit breakers.
As shown in fig. 1-4, the present invention provides an arc extinguishing system, which includes an arc extinguishing chamber 1 and a contact mechanism located at one side of the arc extinguishing chamber 1, wherein the contact mechanism includes a static contact 3 and a moving contact 2, and the static contact 3 and the moving contact 2 are oppositely disposed; the arc extinguishing chamber further comprises a lower arc runner 5 below the arc extinguishing chamber 1; the static contact 3 comprises an arc-shaped arc striking part 31, the arc striking part 31 is bent into a U shape, a static contact is arranged on the outer side of the arc striking part 31, and one end of the arc striking part 31 extends to an arc inlet of the arc extinguishing chamber 1; and a permanent magnet 7 is arranged at least one of the position between the static contact 3 and the movable contact 2, the arc striking part 31 and the position of the lower arc runner 5 close to the arc inlet of the arc extinguishing chamber 1 at one side of the arc extinguishing chamber 1 facing the contact mechanism. The utility model provides an arc extinguishing system.A permanent magnet is arranged at least one of the positions between a static contact and a moving contact, an arc striking part and a position close to a lower arc runner on one side of an arc extinguishing chamber facing a contact mechanism; the permanent magnet is not required to be arranged in the front area of the whole grid piece, so that the cost is saved, the loss of magnetism of the permanent magnet caused by high temperature of electric arc is avoided, and the breaking capacity of the arc extinguish chamber is improved.
As shown in fig. 1 to 4, the arc extinguishing system of the present invention further includes an upper runner 32 located above the arc extinguishing chamber 1; one end of the upper arc runner 32 is connected with the static contact 3, and the other end of the upper arc runner 32 is connected with the magnet yoke 4. The arc extinguishing system further comprises an iron sheet 6, the iron sheet is in contact fit with the permanent magnets, the iron sheet 6 is arranged in other areas except the permanent magnets on two sides of an arc inlet channel between an arc inlet of the arc extinguishing chamber 1 and the contact mechanism, and the iron sheet 6 and the contact mechanism are arranged in a stacked mode in the thickness direction of the arc extinguishing system.
With reference to fig. 1-4, the arc chute 1 is located on the left side and the contact mechanism is located above the right side of the arc chute. The upper arc runner 32 is located right above the arc extinguish chamber 1, the lower arc runner 5 is located below and below the right side of the arc extinguish chamber 1, an arc inlet channel is formed between the lower arc runner 5 and the contact mechanism, and the iron sheet 6 is arranged corresponding to the arc inlet channel area.
The arc extinguishing system is reasonable and compact in overall layout.
In the arc extinguishing system provided by the embodiment of the application, the permanent magnet 7 is arranged at least one of the positions between the fixed contact and the movable contact, the arc striking part of the fixed contact and the arc inlet of the lower runner 5 close to the arc extinguishing chamber 1, so that the Lorentz force applied to the arc is accelerated. Wherein, arrange permanent magnet 7 between static contact and the moving contact, can make the electric arc move to the runway rapidly after the arc starts, avoid the ablation to the sound contact to can increase circuit breaker electric life. As shown in fig. 2, the permanent magnet 7 is arranged at the arc striking part of the static contact, is positioned at the upper arc runner close to the entrance of the grid piece, and is provided at the position, so that the lorentz magnetic force borne by the electric arc when entering the grid piece can be increased, the electric arc is accelerated to enter the area of the grid piece and is cut by the grid piece, and the electric arc voltage is increased; on the other hand, the permanent magnet can enable the electric arc to move closer to the upper arc runner, so that the utilization rate of the grid pieces is improved, and the air flow flux is increased. The permanent magnet is arranged at the position, close to the entrance of the grid piece, of the lower runway arc channel, so that the movement of the arc root can be accelerated, and the arc root can quickly move from the contact area to the grid piece area. Different embodiments can be obtained by combining the arrangement positions of the permanent magnets 7. Four embodiments are described below to explain the arrangement position of the permanent magnet 7 of the present application.
In the embodiment shown in fig. 1, a permanent magnet 7 is arranged between the stationary contact 3 and the movable contact 2 when the contact system is disconnected by a small current.
In the embodiment shown in fig. 2, in order to improve the utilization rate of arc extinguishing grids, a permanent magnet 7 is arranged between the fixed contact 3 and the movable contact 2 and between the arc striking parts 31.
In the embodiment shown in fig. 3, in order to accelerate the arc root to enter the arc chute rapidly, permanent magnets 7 are arranged at the arc striking part 31 and the lower runner 5 near the arc inlet of the arc chute 1.
In the embodiment shown in fig. 4, permanent magnets 7 are arranged between the fixed contact 3 and the movable contact 2, at the arc striking portion 31, and at the arc entrance of the lower runner 5 near the arc extinguishing chamber 1.
In this application embodiment, when the permanent magnet is the polylith, the like name magnetic pole of polylith permanent magnet is arranged relatively, can avoid the influence of direct current polarity, can realize the nonpolar on-off requirement of direct current, and nonpolarity refers to can the upper end terminal inlet wire, the lower extreme is qualified for the next round of competitions in the circuit breaker use, also can be vice versa. The arrangement of the magnetic poles with the same name is that the polarities of the two permanent magnets with the same name are oppositely arranged.
Optionally, as shown in fig. 1 to 4, the permanent magnet 7 between the fixed contact 3 and the movable contact 2 is in a rectangular parallelepiped shape, the permanent magnets 7 between the fixed contact 3 and the movable contact 2 are plural, the plural permanent magnets 7 are respectively located at two sides of the contact mechanism and are stacked in a thickness direction of the arc extinguishing system, that is, the thickness direction of the circuit breaker is set, wherein the number of the permanent magnets 7 between the fixed contact 3 and the movable contact 2 may be two, and the two permanent magnets 7 are respectively located at two sides of the contact mechanism. Preferably, the permanent magnet 7 at the arc striking part 31 is in an arc shape matching the shape of the arc striking part 31, for example, the permanent magnet 7 at the arc striking part 31 may be in a U shape matching the shape of the U-shaped arc striking part 31. Of course, the shape of the arc striking part 31 may not be an arc shape. The permanent magnets 7 at the arc striking part 31 are multiple, and the multiple permanent magnets 7 are respectively positioned at two sides of the contact mechanism, positioned at the inner side of the arc striking part 31 and stacked along the thickness direction of the arc extinguishing system. Wherein, the permanent magnet 7 of striking department 31 department is two, and two permanent magnets 7 are located the both sides of contact mechanism respectively. Alternatively, the permanent magnet 7 near the lower runner 5 has a rectangular parallelepiped shape. In the embodiment of the present application, the structure of the permanent magnet 7 is not limited, and the structure of the permanent magnet 7 may be adjusted according to actual conditions.
As shown in fig. 1, an arc striking chamber is formed among the moving contact 2, the fixed contact 3 and the arc extinguishing chamber 1, the iron sheet 6 is of a sheet structure, and the shape of the iron sheet 6 is matched with the arc striking chamber. Specifically, the side edge of the upper part of the iron sheet 6 is horizontally straight and is positioned below the contact of the static contact 3, the side edge of the lower part of the iron sheet 6 is a bevel edge corresponding to and matched with the lower arc runner 5, a bulge is arranged in the middle of the side edge of the iron sheet 6 close to the arc inlet of the arc extinguish chamber 1, and the side edge of the other side is vertically arranged; the middle part of the iron sheet 6 is provided with a through hole 601 for fixing the iron sheet 6. This application arranges the iron sheet in other regions except that the permanent magnet, only arranges the permanent magnet for the owner in at least one in above-mentioned three positions to whole regional comparison of arranging the permanent magnet scheme, not only can save the cost, can avoid the permanent magnet to lead to the lorentz magnetic force that the electric arc receives because electric arc high temperature loses magnetism to reduce simultaneously.
As shown in fig. 2, the yoke 4 is U-shaped and includes a flat section 41 and a vertical section 42 vertically connected to both ends of the flat section 41, and the yoke 4 is typically provided with an electromagnetic mechanism. The above description is only for one embodiment of the yoke 4, and the structure of the yoke 4 is not limited in the present application, and can be adjusted according to actual conditions.
As shown in fig. 2, the lower arc runner 5 is in a shape of Chinese character 'yi', and includes a horizontal section 51, a bent section 52, a vertical section 53 and an L-shaped section 54; the horizontal segment 51 extends to the bottom of the arc extinguish chamber 1, one end of the bent segment 52 is connected with one end of the horizontal segment 51, the bent segment 52 is arranged obliquely upwards, one end of the vertical segment 53 is connected with the other end of the bent segment 52, the other end of the vertical segment 53 is connected with the L-shaped segment 54, and the L-shaped segment 54 protrudes out of one side of the vertical segment 53. The above is only an embodiment of the lower arc runner 5, and the present application does not limit the structure of the lower arc runner 5, and may be adjusted according to actual situations.
As shown in fig. 5 to 7, in order to apply the arc-extinguishing chamber of the arc-extinguishing system to a dc miniature circuit breaker product, a breaking test of dc 1000V and short-circuit current 6kA was performed.
Fig. 5 shows the arc current and arc voltage waveforms after one opening, and it can be seen that the peak value of the arc voltage is as high as 1.72kV, the arcing time is 4.34ms, and the current limiting performance is very good. Fig. 6 and 7 show the arc voltage and arc current waveforms after the first switch closing and opening operation and the second switch closing and opening operation after the circuit breaker is opened, respectively, the arcing time is below 7ms, the peak value of the arc voltage is maintained above 1.7kV, far exceeds the system voltage 1000V, the test successfully passes, and the validity and feasibility of the arc extinguish chamber structure are verified.
The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.
Claims (10)
1. An arc extinguishing system comprises an arc extinguishing chamber (1) and a contact mechanism positioned on one side of the arc extinguishing chamber (1), wherein the contact mechanism comprises a static contact (3) and a movable contact (2), and the static contact (3) and the movable contact (2) are arranged oppositely; the arc extinguishing chamber also comprises a lower arc runner (5) below the arc extinguishing chamber (1); the static contact (3) comprises an arc-shaped arc striking part (31), and one end of the arc striking part (31) extends to an arc inlet of the arc extinguishing chamber (1); the method is characterized in that:
permanent magnets (7) are arranged on one side, facing the contact mechanism, of the arc extinguish chamber (1) at least one of the positions between the fixed contact (3) and the movable contact (2), the position of the arc striking part (31) and the position of the lower arc runner (5) close to an arc inlet of the arc extinguish chamber (1).
2. The arc extinguishing system of claim 1, wherein: the arc extinguishing chamber further comprises an upper arc runner (32) positioned above the arc extinguishing chamber (1); one end of the upper arc runner (32) is connected with the fixed contact (3), and the other end of the upper arc runner (32) is connected with the magnet yoke (4).
3. The arc extinguishing system of claim 1, wherein: still include iron sheet (6), iron sheet (6) are located the income arc mouth of explosion chamber (1) and are arrived the both sides of advancing the arc passageway between the contact mechanism, and iron sheet (6) and permanent magnet contact cooperation.
4. An arc extinguishing system according to any of claims 1-3, characterized in that: a permanent magnet (7) is arranged between the static contact (3) and the moving contact (2);
or permanent magnets (7) are arranged between the static contact (3) and the movable contact (2) and at the arc ignition part (31);
or permanent magnets (7) are arranged at the arc ignition part (31) and the arc inlet of the lower arc runner (5) close to the arc extinguishing chamber (1);
or permanent magnets (7) are arranged between the static contact (3) and the moving contact (2), at the arc striking part (31) and at the arc inlet of the lower runner (5) close to the arc extinguishing chamber (1).
5. An arc extinguishing system according to any of claims 1-3, characterized in that: the permanent magnet (7) between the static contact (3) and the moving contact (2) is cuboid, the permanent magnets (7) between the static contact (3) and the moving contact (2) are multiple, and the multiple permanent magnets (7) are respectively positioned on two sides of the contact mechanism and are arranged in a stacked mode along the thickness direction of the arc extinguishing system;
and/or the permanent magnet (7) at the arc striking part (31) is in an arc shape and is matched with the arc striking part (31), the permanent magnet (7) at the arc striking part (31) is provided with a plurality of permanent magnets, and the permanent magnets (7) are respectively positioned at two sides of the contact mechanism, positioned at the inner side of the arc striking part (31) and arranged in a stacking manner along the thickness direction of the arc extinguishing system.
6. An arc extinguishing system according to any of claims 1-3, characterized in that: the permanent magnet (7) close to the lower runner (5) is cuboid and arranged along the thickness direction of the arc extinguishing system.
7. The arc extinguishing system of claim 1, wherein: the permanent magnets (7) are multiple, and like magnetic poles of the multiple permanent magnets (7) are oppositely arranged.
8. The arc extinguishing system of claim 3, wherein: an arc striking chamber is formed among the moving contact (2), the static contact (3) and the arc extinguishing chamber (1), the iron sheet (6) is of a sheet structure, and the shape of the iron sheet (6) is matched with the arc striking chamber.
9. The arc extinguishing system of claim 8, wherein: the side edge of the upper part of the iron sheet (6) is horizontally straight and is positioned below the contact of the static contact (3), and the side edge of the lower part of the iron sheet (6) is a bevel edge which corresponds to and is matched with the lower runner (5).
10. A circuit breaker comprising an arc extinguishing system according to any of the preceding claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121613293.2U CN216288285U (en) | 2021-07-15 | 2021-07-15 | Arc extinguishing system and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121613293.2U CN216288285U (en) | 2021-07-15 | 2021-07-15 | Arc extinguishing system and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216288285U true CN216288285U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121613293.2U Active CN216288285U (en) | 2021-07-15 | 2021-07-15 | Arc extinguishing system and circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216288285U (en) |
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2021
- 2021-07-15 CN CN202121613293.2U patent/CN216288285U/en active Active
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