Arc striking and extinguishing device for circuit breaker

Abstract

The invention relates to the technical field of electrical system switches, and discloses an arc striking and extinguishing device for a circuit breaker, which comprises a shell, one end of the outer surface of the shell is connected with a switch, the shell is internally connected with a magnetic push rod and a metal sheet, the side surface of the magnetic push rod is connected with an arc extinguishing chamber, and the switch is internally connected with a swinging device. The swinging device comprises a convex movable block, the movable block can drive an elliptical plate connected with the front end to swing, a spring at the front end of the elliptical plate is connected to be quickly folded to one side by utilizing elastic force during swinging, a metal sheet connected with the top end of the elliptical plate can accelerate the power-off speed, and the two ends of the arc extinguish chamber are connected with the anti-electricity device. The anti-electricity device comprises two swing blocks, the two swing blocks drive the first flash barrier and the second flash barrier on the top to move together when twisting left and right, and when current passes through the arc extinguish chamber connected between the first flash barrier and the second flash barrier, large current generated in the shell can be trapped in the inner cavity, and backflow is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of electrical system switches, in particular to an arc striking and arc extinguishing device for a circuit breaker. Background Art

[0002] A circuit breaker is a switch device that can close, carry and disconnect the current under normal circuit conditions and can close, carry and disconnect the current under abnormal circuit conditions within a specified time. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. When they are seriously overloaded or short-circuited, undervoltage or other faults, they can automatically cut off the circuit. Its function is equivalent to the combination of a fuse switch and an over-underheating relay, and generally no parts need to be changed after breaking the fault current. When using existing circuit breakers, it is inevitable that power outages caused by excessive current will occur. This is also a protection for the circuit breaker itself. However, when some current is too large and passes through the internal arc extinguishing chamber, it will continue to be led upward, which is more likely to cause explosions. There are certain safety hazards during use, so an arc-starting and arc-extinguishing device for circuit breakers is now invented to solve the above problems. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides an arc striking and arc extinguishing device for a circuit breaker.

[0005] (II) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An arc striking and arc extinguishing device for a circuit breaker comprises a shell, one end of the outer surface of the shell is connected to a switch, a magnetic push rod and a metal sheet are connected inside the shell, an arc extinguishing chamber is connected to the side of the magnetic push rod, a swing device is connected inside the switch, the swing device comprises a convex block and a movable block, an elliptical plate is connected to the front end of the movable block, when the movable block drives the elliptical plate to swing, the spring at the front end is connected to be quickly folded to one side by elastic force, and at this time, the metal sheet connected to the top end of the elliptical plate will speed up the prying speed, so that the power is quickly cut off;

[0008] The two ends of the arc extinguishing chamber are connected to an anti-electricity device, which includes two swing blocks. When the two swing blocks are twisted left and right, they will drive the first arc isolation plate and the second arc isolation plate on the top. By setting the arc extinguishing chamber between the two first arc isolation plates and the second arc isolation plates, when a large current is generated inside the shell, the arc can be prevented from flowing back and trapped in the inner cavity until it is extinguished.

[0009] Preferably, the rocking device comprises a convex block, a movable block is movably connected to the rear end of the convex block, an elliptical plate is movably connected between the movable block and the convex block, and the top outer surface of the elliptical plate is fixedly connected to a cylinder.

[0010] Preferably, the top of the front end of the convex block is fixedly connected to two short columns, the outer surfaces of the tops of the two short columns are movably connected to long blocks, the tops of the long blocks are fixedly connected to connecting columns, the outer surfaces of the connecting columns are fixedly connected to springs, the outer surface of the spring is connected to a round shell, and the rear end of the round shell is fixedly connected to the top of the cylinder.

[0011] Preferably, the movable block comprises a V-shaped block, the center of the V-shaped block is fixedly connected to a connecting shaft, and the outer surface of the connecting shaft passes through the bottom of the connecting elliptical plate, and the front end raised part of the top of the V-shaped block is connected to both sides of the elliptical plate.

[0012] Preferably, the anti-electricity device comprises a long rod, both ends of which are movably connected to groove blocks, the rear ends of the two groove blocks are fixedly connected to telescopic columns, and the bottom ends of the two telescopic columns are fixedly connected to the first round rod.

[0013] Preferably, the tops of the two first round rods are movably connected to one end of a rocking block, the other ends of the tops of the two rocking blocks are movably connected to the second round rod, and both ends of the two second round rods are movably connected to the connecting blocks.

[0014] Preferably, the upper and lower ends of the connecting block are connected to the first arc isolation plate and the second arc isolation plate, an arc extinguishing chamber is connected between the first arc isolation plate and the second arc isolation plate, the top of the second arc isolation plate is fixedly connected to a flame extinguishing plate, and the top of the flame extinguishing plate is movably connected to the groove of the rocking block.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the present invention provides an arc striking and arc extinguishing device for a circuit breaker, which has the following beneficial effects:

[0017] 1. The arc striking and arc extinguishing device for the circuit breaker sets the elliptical plate corresponding to the groove of the metal sheet, so that the swing device as a whole can quickly bend the metal sheet that encounters excessive current and disconnect it from the circuit at the bottom, thereby driving the switch outside the shell to change its position downward. The elliptical plate connected to the rear end of the convex block will fold back and forth as the movable block is moved, and the cylinder is connected to the round shell, so it will cooperate with the device at the bottom of the round shell.

[0018] 2. The arc striking and arc extinguishing device for the circuit breaker is connected at the front end of the convex block through two short columns. While supporting the long block at the top, the bottom of the long block can be shaken back and forth on the top of the short column. The connecting column at the top of the long block and the spring connected to the outer surface can use their own elastic force to quickly fold to the bottom when the round shell follows the raised part of the movable block at the rear end to push the elliptical plate, so that it is convenient to quickly cut off the power supply when the internal part is facing a large current for a long time and causes a power outage. Similarly, after the power outage is found, moving the switch upward from the outside will quickly reconnect the power supply.

[0019] 3. The arc striking and arc extinguishing device for the circuit breaker is provided with groove blocks at both ends of the long rod, so that the telescopic column at the rear end of the groove block can be moved left and right when the telescopic column is active. The two first round rods at the bottom end of the telescopic column support the device at the top to guide the arc to the arc extinguishing chamber, thereby preventing phase-to-phase short circuit, making the arc contact with the insulating wall of the arc extinguishing chamber, so as to quickly cool down, increase the deionization effect, increase the arc column voltage drop, and force the arc to extinguish.

[0020] 4. The arc striking and arc extinguishing device for circuit breakers is connected to the top of the first round rod at the bottom of one end of the swing block, and the top of the other end is connected to the second round rod. The second round rods at the upper and lower ends of the connecting block can be retracted inside, so that the first arc isolation plate and the second arc isolation plate on the inner sides of the two connecting blocks are squeezed at the two ends of the arc extinguishing chamber, which can prevent the arc from continuing to move upward and only trap the arc in the inner cavity of the arc extinguishing chamber until the arc is extinguished. The flame extinguishing plate is installed on the top of the second arc isolation plate to further increase the pressure difference, continue to accelerate the extinction speed of the arc, prevent the arc gas from secondary recombination, and reduce the pressure difference in the arc extinguishing chamber, thereby achieving the arc extinguishing effect of the arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal side structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the internal swing device of the switch of the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the swing device of the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the movable block of the present invention;

[0026] Figure 6 It is a schematic diagram of the connection structure between the arc extinguishing chamber and the electric protection device of the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the anti-electricity device of the present invention;

[0028] Figure 8 It is a partial structural schematic diagram of the anti-electrical device of the present invention.

[0029] In the figure: 1. shell; 2. switch; 3. swing device; 31. convex block; 32. movable block; 33. elliptical plate; 34. cylinder; 35. short column; 36. long block; 37. connecting column; 38. spring; 39. round shell; 4. magnetic push rod; 5. arc extinguishing chamber; 6. anti-electric device; 61. long rod; 62. groove block; 63. telescopic column; 64. first round rod; 65. swing block; 66. second round rod; 67. connecting block; 68. first arc isolation plate; 69. second arc isolation plate; 6010. flame extinguishing plate; 7. metal sheet; 321. V-shaped block; 322. connecting shaft. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-8 , an arc striking and arc extinguishing device for a circuit breaker, comprising a housing 1, a switch 2 is arranged at one end of the outer surface of the housing 1, and one end of the outer surface of the housing 1 is movably connected to the outer surface of the switch 2, a magnetic push rod 4 and a metal sheet 7 are connected inside the housing 1, an arc extinguishing chamber 5 is connected to the side of the magnetic push rod 4, a swing device 3 is connected inside the switch 2, the swing device 3 comprises a convex block 31 and a movable block 32, an elliptical plate 33 is connected to the front end of the movable block 32, when the movable block 32 drives the elliptical plate 33 to swing, the spring 38 at the front end is connected to be quickly folded to one side by elastic force, and at this time, the metal sheet 7 connected to one end of the convex block 31 will accelerate the power-off speed;

[0032] Anti-electricity devices 6 are provided at both ends of the arc extinguishing chamber 5, and the two ends of the arc extinguishing chamber 5 are connected to the inside of the anti-electricity devices 6. The anti-electricity devices 6 include two swing blocks 65. When the two swing blocks 65 are twisted left and right, they drive the first arc isolation plate 68 and the second arc isolation plate 69 on the top. By connecting the arc extinguishing chamber 5 between the upper and lower first arc isolation plates 68 and the second arc isolation plates 69, arc backflow can be prevented when a large current is generated inside the casing 1.

[0033] The swing device 3 includes a convex block 31, a movable block 32 is arranged at the rear end of the convex block 31, and the rear end of the convex block 31 is movably connected to the front end of the movable block 32, an elliptical plate 33 is arranged between the movable block 32 and the convex block 31, and the movable block 32 and the convex block 31 are movably connected to both sides of the elliptical plate 33, and a cylinder 34 is arranged on the top outer surface of the elliptical plate 33. By arranging the elliptical plate 33 at the groove corresponding to the metal sheet 7, the swing device 3 as a whole can quickly bend the metal sheet 7 that encounters excessive current and disconnect it from the circuit at the bottom, thereby driving the switch 2 outside the housing 1 to change its position downward, and the elliptical plate 33 connected to the rear end of the convex block 31 will fold back and forth with the movement of the movable block 32, and the cylinder 34 is connected to the round shell 39, so it will cooperate with the device at the bottom of the round shell 39. And the top outer surface of the elliptical plate 33 is fixedly connected to the rear end of the cylinder 34.

[0034] The front end of the convex block 31 is provided with two short columns 35 on the top, and the front end of the convex block 31 is fixedly connected to the rear ends of the two short columns 35 on the top. A long block 36 is provided on the outer surface of the top of the two short columns 35, and the outer surface of the top of the two short columns 35 is movably connected to the bottom of the long block 36. A connecting column 37 is provided on the top of the long block 36, and the top of the long block 36 is fixedly connected to the bottom of the connecting column 37. A spring 38 is provided on the outer surface of the connecting column 37, and the outer surface of the connecting column 37 is fixedly connected to the inside of the spring 38. A round shell 39 is provided on the outer surface of the spring 38, and the outer surface of the spring 38 is connected to the round shell 39. The connection is made by setting two short columns 35 to connect at the front end of the convex block 31. While supporting the long block 36 at the top, the bottom of the long block 36 can also be shaken back and forth on the top of the short column 35. The connection column 37 at the top of the long block 36 and the spring 38 connected to the outer surface can use their own elastic force to quickly fold to the bottom when the round shell 39 follows the raised part of the movable block 32 at the rear end to push the elliptical plate 33, so that it is convenient to quickly cut off the power supply when the internal current is large for a long time and the power is cut off. Similarly, after the power is cut off, the switch 2 is moved upward from the outside to quickly reconnect the power supply. The rear end of the round shell 39 is fixedly connected to the top of the cylinder 34.

[0035] The movable block 32 includes a V-shaped block 321, a connecting shaft 322 is arranged at the center of the V-shaped block 321, and the center of the V-shaped block 321 is fixedly connected to the outer surface of the connecting shaft 322, and the outer surface of the connecting shaft 322 passes through the bottom of the connecting elliptical plate 33, and the front end raised part of the top of the V-shaped block 321 is connected to both sides of the elliptical plate 33.

[0036] The anti-electric device 6 comprises a long rod 61, both ends of which are provided with groove blocks 62, and both ends of the long rod 61 are movably connected to the grooves of the groove blocks 62, and the rear ends of the two groove blocks 62 are provided with telescopic columns 63, and the rear ends of the two groove blocks 62 are fixedly connected to the top of the telescopic columns 63, and the bottom ends of the two telescopic columns 63 are provided with first round rods 64. By providing the groove blocks 62 at both ends of the long rod 61, it is convenient to move the telescopic columns 63 at the rear ends of the groove blocks 62 and the long rod 61 left and right when the groove blocks 62 are moved. The two first round rods 64 at the bottom ends of the telescopic columns 63 support the top device and guide the arc to wander to the arc extinguishing chamber 5, thereby preventing the occurrence of phase-to-phase short circuit, making the arc contact with the insulating wall of the arc extinguishing chamber 5, so as to cool quickly, increase the deionization effect, increase the arc column voltage drop, and force the arc to extinguish. The bottom ends of the two telescopic columns 63 are fixedly connected to the inner side of the first round rod 64.

[0037] The tops of the two first round rods 64 are both provided with swing blocks 65, and the tops of the two first round rods 64 are both movably connected to one end of the swing blocks 65, the other ends of the tops of the two swing blocks 65 are provided with second round rods 66, and the other ends of the tops of the two swing blocks 65 are movably connected to the bottoms of the second round rods 66, the two ends of the second round rods 66 are provided with connecting blocks 67, and the two ends of the second round rods 66 are movably connected to the two ends of the connecting blocks 67, the upper and lower ends of the connecting blocks 67 are both provided with first arc-isolating plates 68 and second arc-isolating plates 69, and the upper and lower ends of the connecting blocks 67 are both connected to the tops of the first arc-isolating plates 68 and the second arc-isolating plates 69, an arc-extinguishing chamber 5 is provided between the first arc-isolating plates 68 and the second arc-isolating plates 69, and the arc-extinguishing chamber 5 is connected to the arc-extinguishing chamber 5 between the first arc-isolating plates 68 and the second arc-isolating plates 69. The two ends are movably connected, a flame extinguishing piece 6010 is provided on the top of the second arc-isolating plate 69, and the top of the second arc-isolating plate 69 is fixedly connected to the bottom of the flame-extinguishing piece 6010. By setting the bottom of one end of the swing block 65 to be connected to the top of the first round rod 64, and the top of the other end to be connected to the second round rod 66, the second round rods 66 at the upper and lower ends of the connecting block 67 can be retracted inside, so that the first arc-isolating plate 68 and the second arc-isolating plate 69 inside the two connecting blocks 67 are squeezed at the two ends of the arc-extinguishing chamber 5, which can prevent the arc from continuing to move upward, and only trap the arc in the inner cavity of the arc-extinguishing chamber 5 until the arc is extinguished. The flame-extinguishing piece 6010 is installed on the top of the second arc-isolating plate 69, further increasing the pressure difference, continuing to accelerate the extinguishing speed of the arc, preventing the arc gas from secondary recombination, and reducing the pressure difference of the arc-extinguishing chamber 5, thereby achieving the effect of arc extinguishing in the arc-extinguishing chamber 5. The top of the flame-extinguishing piece 6010 is movably connected to the groove of the swing block 65.

[0038] When in use, the rocking device 3 inside the switch 2 will speed up the disconnection speed in the face of super-strong current. The rocking device 3 includes a movable block 32, and the movable block 32 connects the elliptical plate 33 to the rear end of the convex block 31, so that the movable block 32 can push the movement of the elliptical plate 33 when swinging, and the cylinder 34 connects the round shell 39 and the elliptical plate 33 together. When the elliptical plate 33 falls to both sides, the elastic force of the spring 38 will increase the falling speed, and the top of the elliptical plate 33 and the groove of the metal sheet 7 will be pried downward or upward to quickly disconnect or reconnect. When the contacts of many components are disconnected, partial arcs will be generated. Due to the contraction of magnetic lines of force, the arcs will be sucked into the arc extinguishing hood. Since there are gaps between each arc extinguishing grid, the arc will be divided into many short arcs after entering. When the AC current passes through zero, all short arcs are extinguished. At the same time, the grid will dissipate heat, and the arc will cool down quickly, thereby achieving the effect of arc extinguishing. Before this, the generated arc will enter the arc extinguishing chamber 5 on one side of the inner part of the shell 1, and then the anti-electricity device 6 connected to the outside of the arc extinguishing chamber 5 will increase the efficiency of extinguishing it. The anti-electricity device 6 includes two first round rods 64, and the two swing blocks 65 connected to the top of the first round rods 64 can be This drives the second round rod 66 on the top to shake slightly left and right, and the second round rod 66 can also shrink at the upper and lower ends of the connecting block 67, shrinking the first arc isolation plate 68 and the second arc isolation plate 69 at both ends of the connecting block 67 to reach the two ends of the arc extinguishing chamber 5, preventing the arc generated by excessive current from continuing to move upward after passing through the arc extinguishing chamber 5. The two first arc isolation plates 68 and the second arc isolation plates 69 plus the flame extinguishing plate 6010 on the top of the second arc isolation plate 69 can just isolate the arc inside the arc extinguishing chamber 5, continue to accelerate the arc extinguishing speed, prevent the arc gas from secondary recombination, and reduce the pressure difference of the arc extinguishing chamber 5, thereby achieving the arc extinguishing effect of the arc extinguishing chamber 5 until the arc is completely extinguished.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An arc striking and arc extinguishing device for a circuit breaker, comprising a housing (1), one end of the outer surface of the housing (1) being connected to a switch (2), a magnetic push rod (4) and a metal sheet (7) being connected inside the housing (1), and an arc extinguishing chamber (5) being connected to the side of the magnetic push rod (4), characterized in that: The switch (2) is internally connected to a swing device (3), the swing device (3) comprising a convex block (31) and a movable block (32), the front end of the movable block (32) being connected to an elliptical plate (33), when the movable block (32) drives the elliptical plate (33) to swing, the spring (38) at the front end is connected to be quickly folded to one side by elastic force, and at this time, the metal sheet (7) connected to the top end of the elliptical plate (33) will speed up the prying speed, so that the power is quickly cut off; The two ends of the arc extinguishing chamber (5) are connected to an anti-electricity device (6), and the anti-electricity device (6) includes two swing blocks (65). When the two swing blocks (65) are twisted left and right, they will drive the first arc isolation plate (68) and the second arc isolation plate (69) on the top. By arranging the arc extinguishing chamber (5) between the two first arc isolation plates (68) and the second arc isolation plates (69), when a large current is generated inside the shell (1), it can prevent the arc from flowing back and trap it in the inner cavity until it is extinguished.

2. The arc striking and arc extinguishing device for a circuit breaker according to claim 1, characterized in that: The swing device (3) comprises a convex block (31), the rear end of the convex block (31) is movably connected to a movable block (32), an elliptical plate (33) is movably connected between the movable block (32) and the convex block (31), and the top outer surface of the elliptical plate (33) is fixedly connected to a cylinder (34).

3. The arc striking and arc extinguishing device for a circuit breaker according to claim 2, characterized in that: The front end of the convex block (31) is fixedly connected to two short columns (35), the outer surfaces of the tops of the two short columns (35) are movably connected to a long block (36), the top of the long block (36) is fixedly connected to a connecting column (37), the outer surface of the connecting column (37) is fixedly connected to a spring (38), the outer surface of the spring (38) is connected to a round shell (39), and the rear end of the round shell (39) is fixedly connected to the top of the cylinder (34).

4. The arc striking and arc extinguishing device for a circuit breaker according to claim 3, characterized in that: The movable block (32) comprises a V-shaped block (321), the center of the V-shaped block (321) is fixedly connected with a connecting shaft (322), and the outer surface of the connecting shaft (322) passes through the bottom of the connecting elliptical plate (33), and the front end convex part of the top of the V-shaped block (321) is connected to both sides of the elliptical plate (33).

5. The arc striking and arc extinguishing device for a circuit breaker according to claim 1, characterized in that: The anti-electricity device (6) comprises a long rod (61), both ends of which are movably connected to groove blocks (62), the rear ends of the two groove blocks (62) are fixedly connected to telescopic columns (63), and the bottom ends of the two telescopic columns (63) are fixedly connected to first round rods (64).

6. The arc striking and arc extinguishing device for a circuit breaker according to claim 5, characterized in that: The tops of the two first round rods (64) are movably connected to one end of a swing block (65), the other ends of the tops of the two swing blocks (65) are movably connected to a second round rod (66), and the two ends of the two second round rods (66) are movably connected to a connecting block (67).

7. The arc striking and arc extinguishing device for a circuit breaker according to claim 6, characterized in that: The upper and lower ends of the connecting block (67) are connected to the first arc isolation plate (68) and the second arc isolation plate (69); the arc extinguishing chamber (5) is connected between the first arc isolation plate (68) and the second arc isolation plate (69); the top of the second arc isolation plate (69) is fixedly connected to the flame extinguishing plate (6010), and the top of the flame extinguishing plate (6010) is movably connected to the groove of the swing block (65).

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