CN209822512U - Arc extinguishing system of miniature circuit breaker - Google Patents
Arc extinguishing system of miniature circuit breaker Download PDFInfo
- Publication number
- CN209822512U CN209822512U CN201920697248.6U CN201920697248U CN209822512U CN 209822512 U CN209822512 U CN 209822512U CN 201920697248 U CN201920697248 U CN 201920697248U CN 209822512 U CN209822512 U CN 209822512U
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- arc
- arc extinguishing
- chamber
- circuit breaker
- explosion chamber
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Abstract
The utility model discloses a miniature circuit breaker arc extinguishing system, including the casing, and set up explosion chamber in the casing, be used for the contact subassembly of control circuit break-make and be used for introducing electric arc the striking plate of explosion chamber, the contact subassembly includes static contact and moving contact, the casing is inherent the rear of explosion chamber is equipped with the arc baffle that sets up along explosion chamber direction of height, the arc baffle with form exhaust passage between the explosion chamber, exhaust passage's upper end and lower extreme all are equipped with the gas vent, have on the casing with the disappointing hole that the gas vent is linked together the arc baffle orientation one side middle part of explosion chamber is equipped with the fender muscle that separates that cuts off exhaust passage. The utility model provides a miniature circuit breaker arc extinguishing system's rational in infrastructure, can obviously promote the arc extinguishing effect.
Description
Technical Field
The utility model relates to an arc extinguishing system, concretely relates to miniature circuit breaker arc extinguishing system.
Background
The miniature circuit breaker is mainly used for AC 50HZ or 60HZ, rated voltage below 400V and rated working current below 63A, is used for the overload short-circuit protection of lighting and distribution line equipment of office buildings, houses and similar buildings, and can also be used for the infrequent on-off operation and switching of lines. The miniature circuit breaker mainly includes tripping system, arc extinguishing system, operating device, contact subassembly etc. and the arc extinguishing system includes explosion chamber and run-on plate, and when the circuit breaker divides the back, can produce electric arc between the movable contact and the static contact, electric arc runs into the explosion chamber along the run-on plate, finally cools off and extinguishes between the arc extinguishing bars piece in the explosion chamber, and high temperature gas discharges the casing. When an existing miniature circuit breaker arc extinguishing system works, high-temperature gas is not smoothly exhausted due to the fact that a good design exhaust structure is not provided, and the arc extinguishing effect is influenced to a certain extent.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims at providing a miniature circuit breaker arc extinguishing system that can promote arc extinguishing performance.
Realize the utility model discloses the technical scheme of purpose is:
the utility model provides a miniature circuit breaker arc extinguishing system, includes the casing, and sets up explosion chamber in the casing, be used for the contact subassembly of control circuit break-make and be used for introducing electric arc the striking plate of explosion chamber, contact subassembly includes static contact and moving contact, it is inherent in the casing the rear of explosion chamber is equipped with the arc baffle that sets up along explosion chamber direction of height, the arc baffle with form exhaust passage between the explosion chamber, exhaust passage's upper end and lower extreme all are equipped with the gas vent, have on the casing with the hole of disappointing that the gas vent is linked together the arc baffle orientation one side middle part of explosion chamber is equipped with the fender muscle that separates that cuts off exhaust passage.
In the technical scheme, the arc striking plate is integrally formed by bending and comprises a first arc striking part, a second arc striking part and a fixed plate part which are sequentially connected, wherein the first arc striking part is positioned below the arc extinguishing chamber, the second arc striking part is positioned at the front part of the arc extinguishing chamber, the first arc striking part is flat-plate-shaped, the second arc striking part is arc-plate-shaped, the fixed plate part is positioned at one side of the second arc striking part, which is back to the arc extinguishing chamber, an n-shaped bend angle is formed at the connection part of the second arc striking part and the fixed plate part, and the distance from the bottom end to the top of the n-shaped bend angle is 2-2.5 mm when the moving contact is at a breaking position; the first arc-striking part and the fixing plate part are provided with positioning pieces which are matched with the positioning slots in the inner wall of the shell in an inserting mode.
In the technical scheme, the arc extinguishing chamber comprises a shell and arc extinguishing grid pieces fixed in the shell at intervals, and the number of the arc extinguishing grid pieces is 13.
The utility model discloses has positive effect: utilize the utility model provides an arc extinguishing system is when the arc extinguishing, and electric arc carries out the arc extinguishing through the arc extinguishing bars piece in the arc chamber is got into to the run-on plate, and electric arc extinguishes back high-temperature gas by the explosion chamber rear discharge to exhaust passage in, owing to separate the existence that keeps off the muscle, high-temperature gas falls into two parts and upwards respectively and flows downwards to arrange to the casing outside through gas vent and disappointing hole, gas discharge is more smooth and easy, is favorable to accelerating the speed that electric arc got into the explosion chamber, and then has promoted the arc extinguishing ability to a certain extent.
Drawings
Fig. 1 is a schematic structural diagram of an arc extinguishing system of the present invention;
fig. 2 is a schematic structural view of a housing in the arc extinguishing system shown in fig. 1;
FIG. 3 is a schematic structural view of a middle arc striking plate according to the present invention;
fig. 4 is a schematic structural diagram of the arc extinguish chamber of the present invention.
The reference symbols shown in the figures are: 1-a shell; 11-an arc baffle; 12-an exhaust channel; 121-an exhaust port; 13-separating and blocking ribs; 14-air release holes; 15-positioning the slot; 2-an arc extinguishing chamber; 21-a housing; 22-arc extinguishing grid sheet; 3-arc striking plate; 31-a first arc ignition portion; 32-a second arc ignition portion; 33-a fixing plate portion; a 34-n corner piece; 35-a positioning sheet; 4-moving contact.
Detailed Description
The specific structure of the present invention is described below with reference to the attached drawings:
the utility model provides a miniature circuit breaker arc extinguishing system, as shown in fig. 1 to 4, it includes casing 1, and sets up explosion chamber 2 in the casing 1, be used for the contact subassembly of control circuit break-make and be used for introducing electric arc striking plate 3 of explosion chamber 2, contact subassembly includes static contact and moving contact 4, casing 1 is inherent the rear of explosion chamber 2 is equipped with the arc baffle 11 that sets up along 2 direction of height of explosion chamber, arc baffle 11 with form exhaust passage 12 between the explosion chamber 2, exhaust passage 12's upper end and lower extreme all are equipped with gas vent 121 arc baffle 11 orientation one side middle part of explosion chamber 2 is equipped with the fender muscle 13 that separates that cuts off exhaust passage 12, have on casing 1 with the discharge hole 14 that gas vent 121 is linked together. Utilize the arc extinguishing system in this embodiment when the arc extinguishing, electric arc carries out the arc extinguishing through arc extinguishing bars piece 22 in the arc extinguishing chamber 2 is got into to the run-on plate 3, electric arc extinguishes back high-temperature gas by 2 rear discharges to exhaust passage 12 in, owing to separate the existence of fender muscle 13, high-temperature gas divides into two strands and upwards respectively and flows down, and arrange to the casing 1 outside through gas vent 121 and 14 rows of disappointing holes, gas discharge is more smooth and easy, be favorable to accelerating electric arc and get into the speed of arc extinguishing chamber 2, and then promoted arc extinguishing ability to a certain extent.
In this embodiment, the arc ignition plate 3 is formed by bending integrally, and includes a first arc ignition portion 31, a second arc ignition portion 32 and a fixed plate portion 33, which are connected in sequence, where the first arc ignition portion 31 is located below the arc extinguish chamber 2, the second arc ignition portion 32 is located at the front of the arc extinguish chamber 2, the first arc ignition portion 31 is flat, the second arc ignition portion 32 is arc plate, the fixed plate portion 33 is located at a side of the second arc ignition portion 32 opposite to the arc extinguish chamber 2, an n-shaped bend 34 is formed at a connection position of the second arc ignition portion 32 and the fixed plate portion 33, and a distance (see L in fig. 1) from a bottom end to a top of the n-shaped bend 34 when the movable contact 4 is at a breaking position is 2-2.5 mm; the first arc ignition part 31 and the fixing plate part 33 are provided with positioning pieces 35 which are matched with the positioning slots 15 in the inner wall of the shell 1 in an inserting mode, the structure of the arc ignition plate 3 is adopted, the distance from the top end of the second arc ignition part 32 to the bottom end of the movable contact 4 is relatively small, and the arc-shaped structure of the second arc ignition part 32 is beneficial to guiding the arc extinguishing chamber 2 to improve the arc extinguishing performance.
The arc extinguishing chamber 2 comprises a housing 21 and arc extinguishing bars 22 fixed in the housing 21 at intervals, and in this embodiment, the number of the arc extinguishing bars 22 is 13.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And such obvious changes and modifications which fall within the spirit of the invention are deemed to be covered by the present invention.
Claims (3)
1. An arc extinguishing system of a miniature circuit breaker comprises a shell (1), an arc extinguishing chamber (2) arranged in the shell (1), a contact component used for controlling the on-off of a circuit and an arc striking plate (3) used for introducing electric arc into the arc extinguishing chamber (2), wherein the contact component comprises a static contact and a moving contact (4), it is characterized in that an arc baffle (11) arranged along the height direction of the arc extinguish chamber (2) is arranged behind the arc extinguish chamber (2) in the shell (1), an exhaust channel (12) is formed between the arc baffle (11) and the arc extinguishing chamber (2), the upper end and the lower end of the exhaust channel (12) are both provided with an exhaust port (121), the shell (1) is provided with an air release hole (14) communicated with the air exhaust port (121), and a blocking rib (13) for blocking the exhaust channel (12) is arranged in the middle of one side of the arc blocking plate (11) facing the arc extinguishing chamber (2).
2. The miniature circuit breaker arc extinguishing system of claim 1, wherein said arc striking plate (3) is formed by bending integrally, which comprises a first arc ignition part (31), a second arc ignition part (32) and a fixed plate part (33) which are connected in sequence, the first arc ignition part (31) is positioned below the arc extinguishing chamber (2), the second arc ignition part (32) is positioned at the front part of the arc extinguishing chamber (2), the first arc ignition part (31) is flat-shaped, the second arc ignition part (32) is arc-shaped plate-shaped, the fixing plate part (33) is arranged on one side of the second arc ignition part (32) back to the arc extinguishing chamber (2), an n-shaped corner (34) is formed at the junction of the second arc ignition portion (32) and the fixing plate portion (33), when the moving contact (4) is at a breaking position, the distance from the bottom end to the top of the n-shaped bent angle (34) is 2-2.5 mm; the first arc-striking part (31) and the fixing plate part (33) are provided with positioning sheets (35) which are in plug-in fit with the positioning slots (15) on the inner wall of the shell (1).
3. The miniature circuit breaker arc extinguishing system according to claim 1 or 2, wherein said arc extinguishing chamber (2) comprises a housing (21) and arc extinguishing bars (22) fixed in said housing (21) at intervals, said arc extinguishing bars (22) being 13 in number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920697248.6U CN209822512U (en) | 2019-05-15 | 2019-05-15 | Arc extinguishing system of miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920697248.6U CN209822512U (en) | 2019-05-15 | 2019-05-15 | Arc extinguishing system of miniature circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209822512U true CN209822512U (en) | 2019-12-20 |
Family
ID=68883422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920697248.6U Active CN209822512U (en) | 2019-05-15 | 2019-05-15 | Arc extinguishing system of miniature circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209822512U (en) |
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2019
- 2019-05-15 CN CN201920697248.6U patent/CN209822512U/en active Active
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