High-breaking miniature circuit breaker

Abstract

The utility model discloses a high breaking miniature circuit breaker, comprising a housing, an arc extinguish chamber arranged in the housing, thirteen arc extinguish grid sheets arranged in the arc extinguish chamber, a magnetic conductive sheet arranged on the upper side of the arc extinguish chamber on the housing, a magnet yoke arranged on the top of the magnetic conductive sheet, a thick iron core arranged in the magnet yoke, and a coil arranged on the outer surface of the thick iron core. The arc extinguishing chamber is internally provided with an arc isolating column, the arc isolating column divides the arc extinguishing chamber into a first buffer cavity and a second buffer cavity, one side of the bottom of the first buffer cavity is provided with a first exhaust port, the first buffer cavity is provided with a second exhaust port above the first exhaust port, and one side of the second buffer cavity is provided with a third exhaust port. By arranging the magnetic conductive sheet, the moving speed of the arc root of the electric arc is increased; an arc-isolating column is arranged behind the arc-extinguishing chamber to prevent electric arc from jumping from bottom to top; the three exhaust ports are arranged, and the first buffer cavity and the second buffer cavity are arranged before exhaust, so that hot air flow is prevented from being reflected into the arc running channel and the contact area, and back breakdown is eliminated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low voltage electrical apparatus technical field, specifically related to a high breaking miniature circuit breaker. BACKGROUND

[0002] Miniature circuit breaker is widely used in terminal electrical circuit, has short circuit protection and thermal protection two functions, operating mechanism generally takes C65 structure and L7 structure as the foundation to do extension, opening and closing angle is about 20 DEG, opening distance is 5-6mm, along with breaking capacity's unceasing enhancement, generally adopts to improve arc voltage to limit arc current, reaches the purpose that fast arc is extinguished, but the region behind arc during breaking namely the arc running track and contact region, still has the temperature higher ionized gas, at this moment, the instantaneous speed of arc voltage is improved and is easy to cause the thermal breakdown between contacts and produce arc again, namely the breakdown behind arc. Therefore, a high breaking miniature circuit breaker is needed to solve the above problems. SUMMARY

[0003] In view of the problems in the above background art, the utility model aims at providing a high breaking miniature circuit breaker.

[0004] To achieve the above technical purpose, the utility model adopts the following technical scheme:

[0005] A high breaking miniature circuit breaker, comprising a shell, an arc extinguishing chamber is arranged in the shell, thirteen arc extinguishing grid plates are installed in the arc extinguishing chamber, a magnetic conducting sheet is installed on the upper side of the arc extinguishing chamber, a magnetic yoke is installed on the top of the magnetic conducting sheet, a thick core is installed in the magnetic yoke, a coil is installed on the outer surface of the thick core, an arc separation column is arranged in the arc extinguishing chamber, the arc separation column divides the arc extinguishing chamber into two parts to form a first buffer cavity and a second buffer cavity, a first exhaust port is arranged on one side of the bottom of the first buffer cavity, a second exhaust port is arranged on the upper side of the first exhaust port of the first buffer cavity, and a third exhaust port is arranged on one side of the second buffer cavity.

[0006] Further limited, the shell is installed with an arc guide plate on the lower side of the arc extinguishing chamber, and an arc separation plate is installed between the magnetic conducting sheet and the arc guide plate. Such a structure design can guide the arc into the arc extinguishing chamber.

[0007] Further limited, a contact mechanism is installed on the upper side inside the shell, and one side of the contact mechanism is connected with one end of the double gold welded with the arc guide plate. Such a structure design is convenient for connection and use.

[0008] Further limited, the left and right sides of the shell are provided with assembly groove communicated with the outside air, the output end of the second exhaust port and the third exhaust port are communicated with the assembly groove, the assembly groove on the left side is provided with an outgoing terminal, the assembly groove on the right side is provided with an incoming terminal, and the incoming terminal is connected with one end of the arc leading plate.

[0009] Further limited, the coil is fixed on the magnetic yoke after penetrating the thick iron core, and the magnetic yoke wraps the coil.

[0010] The utility model discloses the beneficial effect is: the utility model discloses through setting up the magnetic sheet, increases arc root moving speed;The arc column is arranged behind the arc extinguishing chamber, prevents the arc from going up from below;Three exhaust ports are arranged, and the first buffer cavity and the second buffer cavity are arranged before exhausting respectively, prevent hot air current from reflecting into the arc running track and contact area, eliminate the back breakdown. BRIEF DESCRIPTION OF DRAWINGS

[0011] The utility model can be further explained by the non - limited embodiment shown in the drawing;

[0012] Fig. 1 It is a high breaking small circuit breaker's axle side structure schematic diagram for the utility model embodiment;

[0013] Fig. 2 It is a high breaking small circuit breaker's internal structure schematic diagram for the utility model embodiment;

[0014] The main component symbol explanation is as follows:

[0015] Shell 1, arc extinguishing chamber 2, arc extinguishing grid piece 3, magnetic sheet 4, magnetic yoke 5, thick iron core 6, coil 7, arc column 8, first buffer cavity 9, second buffer cavity 10, first exhaust port 11, second exhaust port 12, third exhaust port 13, arc leading plate 14, contact mechanism 15, assembly groove 16, outgoing terminal 17, incoming terminal 18, arc piece 19. DETAILED DESCRIPTION

[0016] In order to make those skilled in the art can better understand the utility model, the utility model technical scheme is further explained below in conjunction with the drawings and examples.

[0017] As Figs. 1-2As shown, the utility model discloses a high breaking small circuit breaker, the shell 1 is equipped with arc extinguishing chamber 2, the arc extinguishing chamber 2 is installed with thirteen arc extinguishing grid piece 3, the shell 1 is installed with the magnetic sheet 4 on the upside of arc extinguishing chamber 2, the top of magnetic sheet 4 is installed with the magnetic yoke 5, the magnetic yoke 5 is installed with the thick core 6, the outer surface of thick core 6 is installed with the coil 7, arc extinguishing chamber 2 is equipped with arc separation column 8, arc separation column 8 divides arc extinguishing chamber 2 into two and forms first buffer chamber 9 and second buffer chamber 10, and the bottom side of first buffer chamber 9 is equipped with first exhaust port 11, and first buffer chamber 9 is equipped with second exhaust port 12 on the upside of first exhaust port 11, and one side of second buffer chamber 10 is equipped with third exhaust port 13.

[0018] Preferably, the shell 1 is installed with an arc guide plate 14 on the downside of the arc extinguishing chamber 2, and an arc separation piece 19 is installed between the magnetic sheet 4 and the arc guide plate 14. Such a structure design can introduce the arc into the arc extinguishing chamber 2. In fact, other structure shapes of the arc guide plate 14 can also be considered according to specific conditions.

[0019] Preferably, a contact mechanism 15 is installed on the upside inside the shell 1, and one side of the contact mechanism 15 is connected to one end of the arc guide plate 14 which is welded together. Such a structure design is convenient for connection. In fact, other connection structure shapes of the contact mechanism 15 can also be considered according to specific conditions.

[0020] Preferably, assembly grooves 16 which are in communication with the outside air are arranged on the left and right sides of the shell 1, the output ends of the second exhaust port 12 and the third exhaust port 13 are in communication with the assembly grooves 16, the left assembly groove 16 is installed with an outgoing terminal 17, the right assembly groove 16 is installed with an incoming terminal 18, and one end of the incoming terminal 18 is connected to the arc guide plate 14. Such a structure design can not only achieve the effect of connection and installation, but also can make the arc discharge out of the shell 1. In fact, other connection and installation structure shapes of the outgoing terminal 17 and the incoming terminal 18 can also be considered according to specific conditions.

[0021] Preferably, the coil 7 is fixed on the magnetic yoke 5 after penetrating into the thick core 6, and the magnetic yoke 5 wraps the coil 7. Such a structure design improves the magnetic density and enhances the attraction speed of the thick core 6. In fact, other installation structure shapes of the coil 7 can also be considered according to specific conditions.

[0022] In the embodiment, the magnetic conductive sheet 4 is arranged and matched with the arc striking plate 14 to improve the arc running path space and the speed of the arc entering the arc extinguishing chamber, the coil 7 penetrates the thick iron core 6 and is fixed on the magnetic yoke 5, the magnetic yoke 5 wraps the coil 7, thereby improving the magnetic density and enhancing the attraction speed of the thick iron core 6, the arc extinguishing chamber 2 is provided with three exhaust ports, i.e., the first exhaust port 11, the second exhaust port 12 and the third exhaust port 13, the arc extinguishing chamber 2 is additionally provided with the arc separation column 8 to prevent the up and down arc jumping of the arc, the rear and lower exhaust design makes the arc first reach the first buffer cavity 9 and then be discharged through the first exhaust port 11 and the second exhaust port 12, the upper exhaust arc first walks to the left and then is discharged from the third exhaust port 13, the buffer cavity space is improved, the back breakdown is reduced, the arc walks in a labyrinth, the deionization is increased, and the flying arc distance is reduced.

[0023] In the embodiment, the large opening distance contact structure is adopted, the opening distance is 8-9mm, the arc extinguishing chamber is 13 pieces, the core attraction area is ensured, thereby improving the arc voltage during breaking, limiting the short circuit current rising, and making the arc extinguish faster.

[0024] In the embodiment, the thick iron core 6 is adopted, the diameter of the thick iron core 6 is 8.4mm, the attraction surface is larger, the breaking speed of the circuit breaker is improved, the magnetic leakage is reduced through the magnetic yoke 5 to improve the electromagnetic intensity, the arc extinguishing chamber 2 is divided into two cavities through the arc separation column 8, thereby preventing the arc jumping and affecting the arc voltage rising.

[0025] In the embodiment, the large opening distance contact structure is adopted, the opening distance is 8-9mm, the arc extinguishing chamber is 13 pieces, the core attraction area is ensured, thereby improving the arc voltage during breaking, limiting the short circuit current rising, and making the arc extinguish faster.

[0026] The above embodiment only exemplarily illustrates the principle and effect of the utility model, and is not used for limiting the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and category of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the utility model should be covered by the claims of the utility model.

Claims

1. A high breaking miniature circuit breaker, characterized by: The utility model relates to an arc extinguishing device, including shell (1), be equipped with arc extinguishing chamber (2) in shell (1), thirteen arc extinguishing louver (3) are installed in arc extinguishing chamber (2), the upper side of arc extinguishing chamber (2) is installed in shell (1) magnetic sheet (4), the top of magnetic sheet (4) is installed magnetic yoke (5), the thick iron core (6) is installed in magnetic yoke (5), the outer surface of thick iron core (6) is installed coil (7), arc extinguishing chamber (2) is equipped with arc separation column (8), arc separation column (8) divides arc extinguishing chamber (2) into two and forms first buffer chamber (9) and second buffer chamber (10), the bottom one side of first buffer chamber (9) is equipped with first exhaust port (11), and the upper side of first exhaust port (11) is equipped with second exhaust port (12) in first buffer chamber (9), and one side of second buffer chamber (10) is equipped with third exhaust port (13).

2. A high breaking miniature circuit breaker according to claim 1, characterized in that: The lower side of arc extinguishing chamber (2) is installed in shell (1) arc plate (14), and arc separation sheet (19) is installed between magnetic sheet (4) and arc plate (14).

3. A high breaking miniature circuit breaker according to claim 2, characterized in that: The upper side in shell (1) is installed contact mechanism (15), and one side of contact mechanism (15) is connected with the double gold one end welded together of arc plate (14).

4. A high breaking miniature circuit breaker according to claim 3, characterized in that: The left and right sides of shell (1) are equipped with the assembly groove (16) of the air communication of outside, and the output end of second exhaust port (12) and third exhaust port (13) are all communicated with assembly groove (16), wherein the assembly groove (16) is installed outlet terminal (17) on the left side, and the assembly groove (16) is installed inlet terminal (18) on the right side, and the inlet terminal (18) is connected with one end of arc plate (14).

5. A high breaking miniature circuit breaker according to claim 4, characterized in that: Coil (7) is fixed on magnetic yoke (5) after penetrating thick iron core (6), and magnetic yoke (5) realizes the wrapping of coil (7).

Images