A miniature circuit breaker

Abstract

The present invention relates to a miniature circuit breaker, which includes a base, a middle seat, and an upper cover. The middle seat is located between the base and the upper cover. A first space is formed between the middle seat and the base, and a second space is formed between the middle seat and the upper cover. An N-pole contact device is arranged in the first space, and an L-pole contact device, an arc extinguishing chamber, and a bimetal pull rod mechanism are arranged in the second space. Above the middle seat, there are a moving contact seat operating mechanism and a trip unit. The moving contact seat operating mechanism includes a moving contact seat, a latch, a latch push rod mechanism, a connecting rod, and a handle. The first end of the connecting rod is movably arranged on the handle, and the second end is arranged on the moving contact seat. The L-pole moving contact of the L-pole contact device and the N-pole moving contact of the N-pole contact device are both arranged on the moving contact seat. A convex column is arranged on the moving contact seat, and the latch is sleeved on the convex column through a through hole arranged thereon. By adopting the above solution, a new method is used to lock or unlock the second end of the connecting rod, so as to realize the closing or opening action of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to a miniature circuit breaker. Background Art

[0002] The existing latch mechanisms of circuit breaker products generally include a lever, a latch and a tripping latch, which have a complex structure and high cost. The volume of the tripping latch is not conducive to automatic assembly, and the product has many parts, so there is a risk of product failure. Summary of the Invention

[0003] The present invention overcomes the problems existing in the prior art and provides a new type of miniature circuit breaker with reasonable structure and stable operation.

[0004] To achieve the above object, the present invention adopts the following technical solution: A miniature circuit breaker includes a base, a middle seat, and an upper cover. The middle seat is located between the base and the upper cover. There is a first space between the middle seat and the base, and a second space between the middle seat and the upper cover. An N-pole contact device is arranged in the first space, and an L-pole contact device, an arc extinguishing chamber, and a bimetal pull rod mechanism are arranged in the second space. Above the middle seat, there is a moving contact seat operating mechanism and a trip unit. It is characterized in that: The moving contact seat operating mechanism includes a moving contact seat, a latch, a latch push rod mechanism, a connecting rod, and a handle. One end of the connecting rod is movably arranged on the handle, and the other end is arranged on the moving contact seat. The L-pole moving contact of the L-pole contact device and the N-pole moving contact of the N-pole contact device are both arranged on the moving contact seat. A convex post is arranged on the moving contact seat. The latch is sleeved on the convex post through a through hole arranged thereon. The latch push rod mechanism includes a spring and a push rod. The elastic force of the spring acts on the push rod, and the top end of the push rod abuts against the latch. Above the moving contact seat, there is a chute, which includes a bent portion and a straight portion. The bent portion of the chute bends upward at one end close to the handle, and the bent portion and the straight portion are communicated. The upper end of the latch is provided with a resisting arm, and a resisting surface is arranged on the resisting arm. After the circuit breaker is disconnected, the top end of the push rod abuts against the side surface of the latch, so that the resisting surface of the latch is close to the bent portion of the chute to lock the second end of the connecting rod in the bent portion of the chute. After the second end of the connecting rod is locked in the bent portion of the chute, the handle can be pushed to close the circuit breaker; After the circuit breaker is closed, the trip unit of the circuit breaker acts on the latch to make the latch rotate, then the resisting surface loses the lock on the second end of the connecting rod. At this time, the second end of the connecting rod can slide into the straight portion of the chute to realize the opening of the circuit breaker; The L-pole moving contact is installed on the convex post on one side of the moving contact seat where the latch is installed, and the side of the moving contact seat where the L-pole moving contact is installed is the first side. On the other side of the moving contact seat, a second convex post is coaxially arranged with the convex post. The N-pole moving contact is installed on the second convex post, and this side of the moving contact seat is the second side. Through holes that communicate with each other are arranged on the convex post and the second convex post of the moving contact seat. A first convex platform is arranged on the base, and a first shaft is integrally arranged on the first convex platform. A first annular groove is arranged around the connection part of the first shaft and the first convex platform. After the second convex post is sleeved on the first shaft, the end of the second convex post abuts against the first annular groove. A second convex platform is arranged on the upper cover, and a second shaft is integrally arranged on the second convex platform. A second annular groove is arranged around the connection part of the second shaft and the second convex platform. After the convex post is sleeved on the second shaft, the end of the convex post abuts against the second annular groove. The width of the cross section of the first annular groove is greater than the wall thickness of the second convex post, and the width of the cross section of the second annular groove is greater than the wall thickness of the convex post. The length of the first shaft is greater than the length of the second shaft. After the moving contact seat is installed on the base and the upper cover, the first shaft and the second shaft abut against each other, and the abutting position is inside the second convex post.

[0005] By adopting the above scheme, a new method is adopted to lock or unlock the second end of the connecting rod to realize the action of closing or disconnecting the circuit breaker. The above method is easy to install, stable in action, and will not cause malfunction; the bending portion is arranged to bend upward, so that the handle is opposite to the traditional circuit breaker in the closing position and the tripping position, meeting the needs of different customers. The traditional circuit breaker cannot achieve reverse. In addition, the above scheme can conveniently install the moving contact seat on the base and the upper cover. The above installation method has multiple insurance functions. No matter whether the boss or the shaft is broken, it will not affect the work, and the product can continue to be used. In addition, the installation is also very convenient.

[0006] A further arrangement of the present invention is that a first arc-striking plate and a second arc-striking plate are arranged in the second space, wherein a static contact of an L-pole contact device is arranged on the first arc-striking plate, the first arc-striking plate is located below the static contact and is bent downward to form an arched portion, the second arc-striking plate has an upwardly inclined beveled edge, an arc-striking area is formed between the arched portion and the beveled edge, mutually offset partitions are arranged on the middle seat and the upper cover and located at the exhaust port of the arc extinguishing chamber, the top ends of the partitions on the middle seat and the upper cover overlap with each other to form offset exhaust through holes, a recessed area is arranged on the middle seat, the recessed areas are respectively an arc extinguishing chamber installation area and a buffer chamber, and the arc extinguishing chamber installation area and the buffer chamber are mutually offset. The buffer chamber is separated from the partition at the position, an arc isolation plate is arranged in the buffer chamber, exhaust through holes are respectively arranged on the bottom and side of the buffer chamber, and a channel communicating with the circuit breaker terminal accommodating cavity is arranged above the buffer chamber; the arc isolation plates are arranged on both the middle seat and the upper cover, at least two arc isolation plates on the middle seat are connected as a whole with the partition on the middle seat, the arc isolation plates on the middle seat are bent downward, at least two arc isolation plates on the upper cover are connected as a whole with the partition on the upper cover, the arc isolation plates on the upper cover are bent downward, and curved long convex ribs are respectively arranged on the middle seat and the upper cover at positions corresponding to the arc striking area, and the setting direction of the long convex ribs is roughly the same as the hypotenuse direction of the second arc striking plate.

[0007] By adopting the above scheme, the space of the arc extinguishing chamber installation area and the buffer chamber can be as large as possible. The space of the arc extinguishing chamber installation area is large, so the arc extinguishing chamber is relatively large, the arc extinguishing effect is good, and the arc extinguishing chamber is not easy to explode; the space of the buffer chamber is large, and the buffering effect is better. In addition, the arc isolation plate in the buffer chamber can divert the arc well, prevent the arc from reigniting, cool the arc, generate gas, increase the pressure, and make the gas better discharged from the exhaust through hole.

[0008] A further arrangement of the present invention is as follows: A third arcing plate and a fourth arcing plate are arranged in the first space. A stationary contact of the N-pole contact device is arranged on the third arcing plate, and an arched portion is arranged below the stationary contact. The fourth arcing plate includes a second inclined side, and the second inclined side is arranged opposite to the arched portion of the third arcing plate to form an N-pole arcing area. A first buffer area is arranged below the second inclined side on the middle seat. The N-pole arcing area is connected to the first buffer area. The first buffer area is concave. A through hole communicating with the outside is arranged on the bottom edge of the first buffer area. Baffles are arranged on the middle seat and the base near the through hole. A second buffer area is arranged at the bottom foot of the middle seat. A convex portion is arranged between the first buffer area and the second buffer area on the middle seat. A channel is formed by the spaced arrangement between the convex portion and the base, and this channel conducts the first buffer area and the second buffer area. An exhaust hole is arranged at the position of the second buffer area on the base, and this exhaust hole constitutes the conduction between the second buffer area and the outside. The fourth arcing plate includes a horizontal side and a second inclined side, and the horizontal side is fixed and installed by cooperating with the ribs or clamping platforms on the middle seat and the base. Long ribs are arranged on the middle seat and the base corresponding to the arcing area, and the direction of the long ribs is basically the same as the direction of the second inclined side.

[0009] By adopting the above scheme, the arc and gas can enter the first buffer area and the second buffer area. Also, since the first buffer area is concave, the first buffer area can be set as large as possible to achieve a better buffering effect. In addition, a through hole is arranged on the first buffer area, so that the high-temperature gas can escape from the through hole. The baffle can well block the metal ions from escaping to prevent electric leakage. The arrangement of the channel enables the gas in the first buffer area to flow into the second buffer area.

[0010] A further arrangement of the present invention is as follows: The moving contact seat is provided with bumps around the sliding groove. An arc surface is provided at the bending part of the bump. The arc surface and the bending part are integrally formed to form a pressing and limiting surface at the second end of the connecting rod. A positioning block is provided below the bump. An arc-shaped convex column is provided around the bottom of the convex column on the first side of the moving contact seat. Convex ribs are provided on the plane around the convex column on the first side of the moving contact seat. An installation through hole is provided on the lock. The installation through hole of the lock is sleeved on the convex column on the first side and forms a rotational fit with the arc-shaped convex column. The L-pole moving contact is sleeved on the convex column on the first side and its side abuts against or is close to the end of the arc-shaped convex column. A first bayonet is provided on the L-pole moving contact. A concave cavity is provided on the moving contact seat corresponding to the first bayonet. A stop block is provided on the lower side of the bump. A limiting groove is formed between the stop block and the side surface on the first side of the moving contact seat. A first torsion spring is provided between the L-pole moving contact and the moving contact seat. The first torsion spring is also sleeved on the convex column on the first side. The first torsion arm of the first torsion spring abuts in the limiting groove. The second torsion arm of the first torsion spring abuts on the first bayonet of the L-pole moving contact. The end wall of the second torsion arm of the first torsion spring has a bent part, and this bent part is inserted into the concave cavity below the first bayonet. A positioning piece is provided on the L-pole moving contact. The positioning piece is located between the positioning block and the bump of the moving contact seat. The abutment between the positioning piece and the positioning block or the bump constitutes the limit of the rotation angle of the L-pole moving contact. A connecting column is provided above the second convex column on the second side of the moving contact seat. A convex edge is provided around the connecting column. A contact surface and a contact convex platform are respectively provided on the convex edge. A third torsion spring is sleeved on the connecting column. The first torsion arm of the third torsion spring abuts on the contact surface. The second torsion arm of the third torsion spring can abut on the contact convex platform. A second stop block is provided below the contact convex platform. A positioning notch is formed between the second stop block and the side surface on the second side of the moving contact seat. A second bayonet is provided on the N-pole moving contact. A second concave cavity is provided on the second side of the moving contact seat corresponding to the second bayonet. The N-pole moving contact is sleeved on the second convex column on the second side of the moving contact seat. And a second torsion spring is provided between the N-pole moving contact and the moving contact seat. The second torsion spring is also sleeved on the second convex column on the second side of the moving contact seat. The first torsion arm of the second torsion spring abuts on the positioning notch. The second torsion arm of the second torsion spring abuts on the second bayonet of the N-pole moving contact. And the end of the second torsion arm of the second torsion spring is bent and inserted into the second concave cavity. A positioning convex block is provided on the second side of the moving contact seat. An N-pole limiting piece is provided on the N-pole moving contact between the positioning convex block and the contact convex platform. The abutment between the N-pole limiting block and the positioning convex block or the contact convex platform constitutes the limit of the rotation angle of the N-pole moving contact.

[0011] By adopting the above scheme, there will be a gap when the buckle rotates in cooperation with the arc-shaped convex post, and dust will enter the gap, so there will be no adhesion problem or the problem of increased friction and jamming caused by dust. The convex rib is provided to reduce friction. The L-pole moving contact is very convenient to install in the above manner. In addition, the two arms of the first torsion spring are firmly fixed on the mounting seat, and can well limit the rotation range of the L-pole moving contact. At the same time, the L-pole moving contact is closer to the static contact when the circuit breaker is closed. In the case of large current, it will rotate first, which is beneficial to quick tripping.

[0012] A further setting of the present invention is that after the circuit breaker is closed, the second end of the connecting rod abuts against the pressing and limiting surface. At this time, the included angle between the thrust direction of the handle on the second end of the connecting rod and the thrust direction of the pressing and limiting surface on the second end of the connecting rod is less than 180 degrees. The abutting surface on the abutting arm is L-shaped. A bending part inclined surface is provided below the abutting surface to facilitate the second end of the connecting rod to slide in. Grooves are provided around the bottom of the chute.

[0013] By adopting the above scheme, it is ensured that under the action of external force, the second end of the connecting rod can move towards the straight part of the chute, so that the circuit breaker can trip normally. In addition, the above-mentioned pressing and limiting surface has a larger area, resulting in a better pressing effect.

[0014] The following further illustrates the present invention with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a perspective view of an embodiment of the present invention;

[0016] Figure 2 is a cross-sectional view of an embodiment of the present invention reflecting the first space and the second space;

[0017] Figure 3 is a perspective view within the first space of an embodiment of the present invention;

[0018] Figure 4 is a perspective view of the frame in an embodiment of the present invention;

[0019] Figure 5 is a perspective view of the upper cover of an embodiment of the present invention;

[0020] Figure 6 is a perspective view of the base of an embodiment of the present invention;

[0021] Figure 7 is a structural diagram of an embodiment of the present invention reflecting the first buffer area and the second buffer area;

[0022] Figure 8 is a cross-sectional view of an embodiment of the present invention reflecting the channel;

[0023] Figure 9This is a perspective view showing the moving contact seat, the latch, and the installation of the L-pole moving contact in the embodiment of the present invention;

[0024] Figure 10 This is a perspective view showing the chute on the moving contact seat in the embodiment of the present invention;

[0025] Figure 11 This is a perspective view showing the installation of the N-pole moving contact and the moving contact seat in the embodiment of the present invention;

[0026] Figure 12 This is a perspective view showing the second convex post of the moving contact seat in the embodiment of the present invention;

[0027] Figure 13 This is a perspective view showing the installation of the moving contact seat and the latch in the embodiment of the present invention;

[0028] Figure 14 This is a perspective view showing the cooperation of the moving contact seat, the connecting rod, and the handle in the embodiment of the present invention;

[0029] Figure 15 is Figure 14 mechanical schematic diagram;

[0030] Figure 16 This is a perspective view of the moving contact in the embodiment of the present invention;

[0031] Figure 17 This is a cross-sectional view showing the installation structure of the moving contact seat in the embodiment of the present invention. Detailed implementation manners

[0032] Such as Figures 1 - 17As shown in the figure, a miniature circuit breaker includes a base 1, a middle seat 2, and an upper cover 3. The middle seat 2 is located between the base 1 and the upper cover 3. There is a first space 11 between the middle seat 2 and the base 1, and a second space 12 between the middle seat 2 and the upper cover 3. An N-pole contact device is arranged in the first space 11, and an L-pole contact device, an arc extinguishing chamber C, and a bimetal pull rod mechanism are arranged in the second space 12. Above the middle seat 2, there is a moving contact seat actuating mechanism E and a release F. The moving contact seat actuating mechanism E includes a moving contact seat E1, a latch E2, a latch push rod mechanism, a connecting rod E9, and a handle E8. One end of the connecting rod E9 is movably arranged on the handle E8, and the other end is arranged on the moving contact seat E1. The L-pole moving contact E3 of the L-pole contact device and the N-pole moving contact E4 of the N-pole contact device are both arranged on the moving contact seat E1. A convex column E14 is arranged on the moving contact seat E1, and the latch E2 is sleeved on the convex column E14 through a through hole E21 arranged thereon. The latch push rod mechanism includes a spring E61 and a push rod E62. The elastic force of the spring E61 acts on the push rod E62, and the top of the push rod E62 abuts against the latch E2. Above the moving contact seat E1, there is a chute E111, which includes a bending part E1111 and a straight part E1112. The bending part E1111 of the chute E111 bends upward at one end close to the handle E8, and the bending part E1111 and the straight part E1112 are conductively arranged. A contact arm E22 is arranged at the upper end of the latch E2, and a contact surface E23 is arranged on the contact arm E22. After the circuit breaker is disconnected, the top of the push rod E62 abuts against the side surface of the latch E2, so that the contact surface E23 of the latch E2 is close to the bending part E1111 of the chute to lock the second end of the connecting rod E9 in the bending part E1111 of the chute. After the second end of the connecting rod E9 is locked in the bending part E1111 of the chute, the handle E8 can be pushed to close the circuit breaker; after the circuit breaker is closed, the release F of the circuit breaker acts on the latch E2 to make the latch E2 rotate, then the contact surface E23 loses the lock on the second end of the connecting rod E9. At this time, the second end of the connecting rod E9 can slide into the straight part E1112 of the chute to realize the opening of the circuit breaker;An L-pole moving contact E3 is installed on a convex column E14 on one side of a latch E2 installed on the moving contact seat E1. The side of the moving contact seat E1 where the L-pole moving contact is installed is the first side E11. On the other side of the moving contact seat E1, a second convex column E15 is coaxially arranged with the convex column E14. An N-pole moving contact E4 is installed on the second convex column E15. The side of the moving contact seat E1 on this side is the second side E12. Through holes communicating with each other are provided on the convex column E14 and the second convex column E15 of the moving contact seat E1. A first convex platform H11 is provided on the base 1. A first shaft H12 is integrally provided on the first convex platform H11. A first annular groove H13 is provided on the periphery of the connecting part of the first shaft H12 and the first convex platform H1. After the second convex column E15 is sleeved on the first shaft H12, the end of the second convex column E15 abuts against the first annular groove H13. A second convex platform H31 is provided on the upper cover 3. A second shaft H32 is integrally provided on the second convex platform H31. A second annular groove H33 is provided on the periphery of the connecting part of the second shaft H32 and the second convex platform H3. After the convex column E14 is sleeved on the second shaft H32, the end of the convex column E14 abuts against the second annular groove H33. The width of the cross section of the first annular groove H13 is greater than the wall thickness of the second convex column E15. The width of the cross section of the second annular groove H33 is greater than the wall thickness of the convex column E14. The length of the first shaft H12 is greater than the length of the second shaft H32. After the moving contact seat E1 is installed on the base 1 and the upper cover 3, the first shaft H12 abuts against the second shaft H32, and the abutting position is inside the convex column E14. By adopting the above scheme, a new method is used to lock or unlock the second end of the connecting rod E9, realizing the closing or opening action of the circuit breaker. The above method is convenient to install, has stable operation and will not malfunction. The bending part E1111 is set to bend upward, so that the handle E8 is in the closing position and the tripping position, which is opposite to that of the traditional circuit breaker, meeting the needs of different customers. The traditional circuit breaker cannot be reversed. In addition, the above scheme can conveniently install the moving contact seat E1 on the base 1 and the upper cover 3. The above installation method has multiple insurance effects. Whether the convex column or the shaft breaks, it will not affect the work and the product can still be used. In addition, the installation is very convenient.;

[0033] In the embodiment of the present invention, a first arcing plate B1 and a second arcing plate B2 are arranged in the second space 12. A stationary contact of the L-pole contact device is arranged on the first arcing plate B1. The first arcing plate B1 is bent downward in the downward direction of the stationary contact to form an arched portion B11. The second arcing plate B2 has an inclined upward hypotenuse B21. An arcing area is formed between the arched portion B11 and the hypotenuse B21. Partition plates B3 which are mutually offset are arranged on the middle seat 2 and the upper cover 3 and at the exhaust port of the arc extinguishing chamber C. The tops of the partition plates B3 on the middle seat 2 and the upper cover 3 are mutually overlapped to form an offset exhaust through hole. A recessed area is arranged on the middle seat 2, and the recessed area is respectively an arc extinguishing chamber installation area B5 and a buffer chamber B4. The arc extinguishing chamber installation area B5 and the buffer chamber B4 are separated by the mutually offset partition plates B3. An arc separating plate B41 is arranged in the buffer chamber B4. Exhaust through holes B42 are respectively arranged on the bottom edge and the side edge of the buffer chamber B4. A channel B43 which is communicated with the accommodating cavity of the breaker terminal is arranged above the buffer chamber B4. The arc separating plate B41 is arranged on both the middle seat 2 and the upper cover 3. At least two arc separating plates B41 on the middle seat 2 are integrally connected with the partition plates B3 on the middle seat 2. The arc separating plates B41 on the middle seat 2 are bent downward. At least two arc separating plates B41 on the upper cover 3 are integrally connected with the partition plates B3 on the upper cover 3. The arc separating plates B41 on the upper cover 3 are bent downward. Curved long ribs B7 are respectively arranged on the middle seat 2 and the upper cover 3 and at the position corresponding to the arcing area. The arrangement direction of the long ribs B7 is substantially the same as the direction of the hypotenuse B21 of the second arcing plate B2. By adopting the above scheme, the spaces of the arc extinguishing chamber installation area B5 and the buffer chamber B4 are as large as possible. Among them, the space of the arc extinguishing chamber installation area B5 is large, so that the arc extinguishing chamber C is relatively large, the arc extinguishing effect is good, and the arc extinguishing chamber is not easily exploded. The space of the buffer chamber B4 is large, and the buffering effect is better. In addition, the arc separating plate B41 in the buffer chamber B4 can well shunt the arc, prevent the arc from reigniting, cool the arc, generate gas, increase the pressure, and enable the gas to be better discharged from the exhaust through hole.

[0034] In an embodiment of the present invention, a third arcing plate A1 and a fourth arcing plate A2 are disposed in the first space 11. A static contact of the N-pole contact device is disposed on the third arcing plate A1, and an arched portion A11 is disposed below the static contact. The fourth arcing plate A2 includes a second inclined side A21, and the second inclined side A21 is disposed opposite to the arched portion A11 of the third arcing plate A1 to form an N-pole arcing region. A first buffer zone A3 is disposed below the second inclined side A21 on the middle seat 2. The N-pole arcing region is connected to the first buffer zone A3. The first buffer zone A3 is recessed. A through hole A31 communicating with the outside is disposed on the bottom edge of the first buffer zone A3. Baffles A32 are disposed on the middle seat 2 and the base 1 near the through hole A31. A second buffer zone A4 is disposed at the bottom foot of the middle seat 2. A convex portion A5 is disposed between the first buffer zone A3 and the second buffer zone A4 on the middle seat 2. A channel A6 is formed by an interval between the convex portion A5 and the base 1, and the channel A6 conducts the first buffer zone A3 and the second buffer zone A4. An exhaust hole A41 is disposed on the base 1 at the position of the second buffer zone A4, and the exhaust hole A41 conducts the second buffer zone A4 and the outside. The fourth arcing plate A2 includes a horizontal side A22 and a second inclined side A21. The horizontal side A22 is fixedly installed by cooperating with the ribs or clamping platforms on the middle seat 2 and the base 1. Long ribs A7 are disposed on the middle seat 2 and the base 1 corresponding to the arcing region, and the direction of the long ribs A7 is generally integrated with the direction of the second inclined side A21. By adopting the above scheme, the arc and gas can enter the first buffer zone A3 and the second buffer zone A4. Also, since the first buffer zone A3 is recessed, the first buffer zone A3 can be set as large as possible to make the buffering effect better. In addition, a through hole is disposed on the first buffer zone A3, so that the high-temperature gas can run out from the through hole. The baffle A32 can well block the metal ions or metal particles from running out to prevent short circuit to the ground. The setting of the channel A6 can make the gas in the first buffer zone A3 run into the second buffer zone A4.

[0035] In an embodiment of the present invention, a convex block E112 is provided around the straight portion E1112 of the chute E111 of the moving contact seat E1. An arc surface is provided at the convex block E112 at the bending portion. This arc surface and the bending portion E1111 are integrally formed to form a pressing and limiting surface E1123 at the second end of the connecting rod E9. A positioning block E113 is provided below the convex block E112. An arc-shaped convex column E114 is provided around the bottom of the convex column E14 on the first side of the moving contact seat E1 for one week. Convex ribs E115 are provided on the plane around the convex column E14 on the first side of the moving contact seat E1. An installation through hole E21 is provided on the latch E2. The installation through hole E21 of the latch E2 is sleeved on the convex column E14 on the first side and forms a rotational fit with the arc-shaped convex column E114. The L-pole moving contact E3 is sleeved on the convex column E14 on the first side, and its side abuts or is close to the end of the arc-shaped convex column E114. A first bayonet E31 is provided on the L-pole moving contact E3. A concave cavity E16 is provided on the moving contact seat E1 corresponding to the first bayonet E31. A stop block E1121 is provided on the lower side of the convex block E112. A limiting groove E1122 is formed between the stop block E1121 and the side surface of the first side E11 of the moving contact seat E1. A first torsion spring E5 is provided between the L-pole moving contact E3 and the moving contact seat E1. The first torsion spring E5 is also sleeved on the convex column E14 on the first side E11. The first torsion arm of the first torsion spring E5 abuts in the limiting groove E1122. The second torsion arm of the first torsion spring E5 abuts on the first bayonet E31 of the L-pole moving contact E3. The end wall of the second torsion arm of the first torsion spring E5 has a bent portion, and this bent portion is inserted into the concave cavity E16 below the first bayonet E31. A positioning piece E32 is provided on the L-pole moving contact E3. This positioning piece E32 is located between the positioning block E113 and the limiting groove E1122 of the moving contact seat E1. The abutment between the positioning piece E32 and the positioning block E113 or the limiting groove E1122 constitutes the limit of the rotation angle of the L-pole moving contact E3. A connecting column E121 is provided above the second convex column E15 on the second side E12 of the moving contact seat E1. A convex edge E1211 is provided around the connecting column E121 for one week. A contact surface E12111 and a contact convex platform E12112 are respectively provided on the convex edge E1211. A third torsion spring E6 is sleeved on the connecting column E121. The first torsion arm of the third torsion spring E6 abuts on the contact surface E12111. The second torsion arm of the third torsion spring E6 can abut on the contact convex platform E12112. A second stop block E121121 is provided below the contact convex platform E12112. A positioning notch E121122 is formed between the second stop block E121121 and the side surface of the second side E12 of the moving contact seat E1. A second bayonet E42 is provided on the N-pole moving contact E4. A second concave cavity E123 is provided on the second side E12 of the moving contact seat E1 corresponding to the second bayonet E42. The N-pole moving contact E4 is sleeved on the second convex column E15 on the second side E12 of the moving contact seat E1, and a second torsion spring E7 is provided between the N-pole moving contact E4 and the moving contact seat E1.The second torsion spring E7 is also sleeved on the second convex post E15 on the second side E12 of the moving contact seat E1. The first torsion arm of the second torsion spring E7 abuts against the positioning notch E121122, and the second torsion arm of the second torsion spring E7 abuts against the second bayonet E42 of the N-pole moving contact E4. Moreover, the end of the second torsion arm of the second torsion spring E7 is bent and inserted into the second cavity E123. A positioning convex block E122 is provided on the second side E12 of the moving contact seat E1. An N-pole limiting piece E41 is provided on the N-pole moving contact E4 and located between the positioning convex block E122 and the positioning notch E121122. The abutment between the N-pole limiting block E41 and the positioning convex block E122 or the positioning notch E121122 constitutes the limit of the rotation angle of the N-pole moving contact E4. With the above scheme, the lock catch E2 is rotationally matched with the arc-shaped convex post E114, and there will be a gap, and dust will enter the gap, and there will be no problems of adhesion and increased friction and jamming caused by dust. The setting of the rib E115 is to reduce the friction; the L-pole moving contact E3 is very convenient to install in the above manner. In addition, the two arms of the first torsion spring E5 are firmly fixed on the mounting seat, and can well limit the rotation range of the L-pole moving contact E3. At the same time, the L-pole moving contact E3 is closer to the static contact when closing the switch, and will rotate first under the condition of large current, which is beneficial to quick opening of the switch.,

[0036] In the embodiment of the present invention, after the circuit breaker is closed, the second end of the connecting rod E9 abuts against the pressing limiting surface E1123. At this time, the included angle K between the thrust direction F1 generated by the handle E8 on the second end of the connecting rod E9 and the thrust direction F2 generated by the pressing limiting surface E1123 on the second end of the connecting rod E9 is less than 180 degrees. The abutting surface E23 on the abutting arm E22 is L-shaped, and a bending part inclined surface E24 is provided below the abutting surface E23 to facilitate the second end of the connecting rod E9 to slide in. Grooves E1113 are provided around the bottom of the chute E111; with the above scheme, it is ensured that under the action of an external force on the lock catch E2, the second end of the connecting rod E9 can move towards the straight part E1111 of the chute, so as to realize the normal tripping of the circuit breaker.

Claims

1. A miniature circuit breaker, comprising a base, a middle seat, and an upper cover. The middle seat is located between the base and the upper cover. There is a first space between the middle seat and the base, and a second space between the middle seat and the upper cover. An N-pole contact device is arranged in the first space, and an L-pole contact device, an arc extinguishing chamber, and a bimetal pull rod mechanism are arranged in the second space. Above the middle seat, there are a moving contact seat operating mechanism and a tripping device. Characterized in that: The moving contact seat operating mechanism includes a moving contact seat, a latch, a latch push rod mechanism, a connecting rod, and a handle. One end of the connecting rod is movably arranged on the handle, and the other end is arranged on the moving contact seat. The L-pole moving contact of the L-pole contact device and the N-pole moving contact of the N-pole contact device are both arranged on the moving contact seat. There is a convex column on the moving contact seat. The latch is sleeved on the convex column through a through hole arranged thereon. The latch push rod mechanism includes a spring and a push rod. The elastic force of the spring acts on the push rod, and the top end of the push rod abuts against the latch. Above the moving contact seat, there is a chute, which includes a bending part and a straight part. The bending part of the chute bends upward at one end close to the handle, and the bending part and the straight part are conductively arranged. There is a contact arm at the upper end of the latch, and a contact surface is arranged on the contact arm. After the circuit breaker is disconnected, the top end of the push rod abuts against the side of the latch, so that the contact surface of the latch is close to the bending part of the chute to lock the second end of the connecting rod in the bending part of the chute. After the second end of the connecting rod is locked in the bending part of the chute, the handle can be pushed to close the circuit breaker; after the circuit breaker is closed, the tripping device of the circuit breaker acts on the latch to make the latch rotate, and then the contact surface loses the lock on the second end of the connecting rod. At this time, the second end of the connecting rod can slide into the straight part of the chute to realize the opening of the circuit breaker; the L-pole moving contact is installed on the convex column on one side of the moving contact seat where the latch is installed, and the side of the moving contact seat where the L-pole moving contact is installed is the first side. On the other side of the moving contact seat, a second convex column is coaxially arranged with the convex column. The N-pole moving contact is installed on the second convex column, and this side of the moving contact seat is the second side. There is a through hole communicating with each other on the convex column and the second convex column of the moving contact seat. There is a first convex platform on the base, and a first shaft is integrally arranged on the first convex platform. There is a first annular groove around the connecting part of the first shaft and the first convex platform. After the second convex column is sleeved on the first shaft, the end of the second convex column abuts against the first annular groove. There is a second convex platform on the upper cover, and a second shaft is integrally arranged on the second convex platform. There is a second annular groove around the connecting part of the second shaft and the second convex platform. After the convex column is sleeved on the second shaft, the end of the convex column abuts against the second annular groove. The width of the cross section of the first annular groove is greater than the wall thickness of the second convex column, and the width of the cross section of the second annular groove is greater than the wall thickness of the convex column. The length of the first shaft is greater than the length of the second shaft. After the moving contact seat is installed on the base and the upper cover, the first shaft and the second shaft abut against each other, and the abutting position is inside the second convex column.

2. The miniature circuit breaker according to claim 1, Characterized in that: A first arcing plate and a second arcing plate are arranged in the second space. A static contact of the L-pole contact device is arranged on the first arcing plate. The first arcing plate is bent downward in the downward direction of the static contact to form a arched portion. The second arcing plate has an inclined upward hypotenuse. An arcing area is formed between the arched portion and the hypotenuse. Partition plates which are offset from each other are arranged on the middle seat and the upper cover and at the exhaust port of the arc extinguishing chamber. The tops of the partition plates on the middle seat and the upper cover are mutually overlapped to form an offset exhaust through hole. A concave area is arranged on the middle seat. The concave area is respectively an arc extinguishing chamber installation area and a buffer chamber. The arc extinguishing chamber installation area and the buffer chamber are separated by partition plates which are offset from each other. An arc separating plate is arranged in the buffer chamber. Exhaust through holes are respectively arranged on the bottom edge and the side edge of the buffer chamber. A channel communicating with the accommodating cavity of the circuit breaker terminal is arranged above the buffer chamber.

3. The miniature circuit breaker according to claim 2, characterized in that: the arc separating plates are arranged on both the middle seat and the upper cover. At least two arc separating plates on the middle seat are integrally connected with the partition plates on the middle seat. The arc separating plates on the middle seat are bent downward. At least two arc separating plates on the upper cover are integrally connected with the partition plates on the upper cover. The arc separating plates on the upper cover are bent downward. Curved long ribs are respectively arranged on the middle seat and the upper cover and at the position corresponding to the arcing area. The arrangement direction of the long ribs is the same as the direction of the hypotenuse of the second arcing plate.

4. The miniature circuit breaker according to claim 1 or 2, characterized in that: a third arcing plate and a fourth arcing plate are arranged in the first space. A static contact of the N-pole contact device is arranged on the third arcing plate. An arched portion is arranged below the static contact. The fourth arcing plate includes a second hypotenuse. The second hypotenuse is oppositely arranged with the arched portion of the third arcing plate to form an N-pole arcing area. A first buffer area is arranged on the middle seat below the second hypotenuse. The N-pole arcing area and the first buffer area are connected together. The first buffer area is concave. A through hole communicating with the outside is arranged on the bottom edge of the first buffer area. Baffles are arranged on both the middle seat and the base and near the through hole. A second buffer area is arranged at the bottom foot of the middle seat. A raised portion is arranged on the middle seat between the first buffer area and the second buffer area. A channel is formed by an interval arrangement between the raised portion and the base. The channel enables the first buffer area and the second buffer area to be communicated.

5. The miniature circuit breaker according to claim 4, characterized in that: an exhaust hole is arranged on the base and at the position of the second buffer area. The exhaust hole constitutes a communication between the second buffer area and the outside. The fourth arcing plate includes a horizontal side and a second hypotenuse. The horizontal side is matched with the ribs or clamping platforms on the middle seat and the base to realize fixed installation. Long ribs are arranged on the middle seat and the base corresponding to the arcing area. The direction of the long ribs is the same as the direction of the second hypotenuse.

6. The miniature circuit breaker according to claim 1 or 2, characterized in that: The moving contact seat is provided with bumps around the chute. The bumps are provided with arc surfaces at the bending parts. The arc surfaces and the bending parts are integrally formed to form a pressing and limiting surface at the second end of the connecting rod. A positioning block is arranged below the bumps. An arc-shaped convex column is arranged around the bottom of the convex column on the first side of the moving contact seat. Convex ribs are arranged on the plane around the convex column on the first side of the moving contact seat. An installation through hole is arranged on the latch. The installation through hole of the latch is sleeved on the convex column on the first side and forms a rotational fit with the arc-shaped convex column. The L-pole moving contact is sleeved on the convex column on the first side and its side abuts against or is close to the end of the arc-shaped convex column. A first bayonet is arranged on the L-pole moving contact. A concave cavity is arranged on the moving contact seat corresponding to the first bayonet. A stop block is arranged on the lower side of the bump. A limiting groove is formed between the stop block and the side surface on the first side of the moving contact seat. A first torsion spring is arranged between the L-pole moving contact and the moving contact seat. The first torsion spring is also sleeved on the convex column on the first side. The first torsion arm of the first torsion spring abuts in the limiting groove. The second torsion arm of the first torsion spring abuts on the first bayonet of the L-pole moving contact. The end wall of the second torsion arm of the first torsion spring has a bent part, and the bent part is inserted into the concave cavity below the first bayonet. A positioning piece is arranged on the L-pole moving contact. The positioning piece is located between the positioning block and the bump of the moving contact seat. The abutment between the positioning piece and the positioning block or the bump constitutes the limit of the rotation angle of the L-pole moving contact. A connecting column is arranged above the second convex column on the second side of the moving contact seat. A convex edge is arranged around the connecting column. A contact surface and a contact boss are respectively arranged on the convex edge. A third torsion spring is sleeved on the connecting column. The first torsion arm of the third torsion spring abuts on the contact surface. The second torsion arm of the third torsion spring can abut on the contact boss. A second stop block is arranged below the contact boss. A positioning notch is formed between the second stop block and the side surface on the second side of the moving contact seat. A second bayonet is arranged on the N-pole moving contact. A second concave cavity is arranged on the second side of the moving contact seat corresponding to the second bayonet. The N-pole moving contact is sleeved on the second convex column on the second side of the moving contact seat. A second torsion spring is arranged between the N-pole moving contact and the moving contact seat. The second torsion spring is also sleeved on the second convex column on the second side of the moving contact seat. The first torsion arm of the second torsion spring abuts on the positioning notch. The second torsion arm of the second torsion spring abuts on the second bayonet of the N-pole moving contact. The end of the second torsion arm of the second torsion spring is bent and inserted into the second concave cavity. A positioning convex block is arranged on the second side of the moving contact seat. An N-pole limiting piece is arranged on the N-pole moving contact between the positioning convex block and the contact boss. The abutment between the N-pole limiting block and the positioning convex block or the contact boss constitutes the limit of the rotation angle of the N-pole moving contact.

7. The miniature circuit breaker according to claim 4, characterized in that: The moving contact seat is provided with bumps around the sliding groove. The bumps are provided with arc surfaces at the bending parts. The arc surfaces are integrally formed with the bending parts to form a pressing and limiting surface at the second end of the connecting rod. A positioning block is arranged below the bumps. An arc-shaped convex column is arranged around the bottom of the convex column on the first side of the moving contact seat. Convex ribs are arranged on the plane around the convex column on the first side of the moving contact seat. An installation through hole is arranged on the latch. The installation through hole of the latch is sleeved on the convex column on the first side and forms a rotational fit with the arc-shaped convex column. The L-pole moving contact is sleeved on the convex column on the first side, and its side abuts against or is close to the end of the arc-shaped convex column. A first bayonet is arranged on the L-pole moving contact. A concave cavity is arranged on the moving contact seat corresponding to the first bayonet. A stop block is arranged on the lower side of the bump. A limiting groove is formed between the stop block and the side surface on the first side of the moving contact seat. A first torsion spring is arranged between the L-pole moving contact and the moving contact seat. The first torsion spring is also sleeved on the convex column on the first side. The first torsion arm of the first torsion spring abuts in the limiting groove. The second torsion arm of the first torsion spring abuts on the first bayonet of the L-pole moving contact. The end wall of the second torsion arm of the first torsion spring has a bent part, and the bent part is inserted into the concave cavity below the first bayonet. A positioning piece is arranged on the L-pole moving contact. The positioning piece is located between the positioning block and the bump of the moving contact seat. The abutment between the positioning piece and the positioning block or the bump constitutes the limit of the rotation angle of the L-pole moving contact. A connecting column is arranged above the second convex column on the second side of the moving contact seat. A convex edge is arranged around the connecting column. A contact surface and a contact convex platform are respectively arranged on the convex edge. A third torsion spring is sleeved on the connecting column. The first torsion arm of the third torsion spring abuts on the contact surface. The second torsion arm of the third torsion spring can abut on the contact convex platform. A second stop block is arranged below the contact convex platform. A positioning notch is formed between the second stop block and the side surface on the second side of the moving contact seat. A second bayonet is arranged on the N-pole moving contact. A second concave cavity is arranged on the second side of the moving contact seat corresponding to the second bayonet. The N-pole moving contact is sleeved on the second convex column on the second side of the moving contact seat. A second torsion spring is arranged between the N-pole moving contact and the moving contact seat. The second torsion spring is also sleeved on the second convex column on the second side of the moving contact seat. The first torsion arm of the second torsion spring abuts on the positioning notch. The second torsion arm of the second torsion spring abuts on the second bayonet of the N-pole moving contact. The end of the second torsion arm of the second torsion spring is bent and inserted into the second concave cavity. A positioning convex block is arranged on the second side of the moving contact seat. An N-pole limiting piece is arranged on the N-pole moving contact between the positioning convex block and the contact convex platform. The abutment between the N-pole limiting block and the positioning convex block or the contact convex platform constitutes the limit of the rotation angle of the N-pole moving contact.

8. The miniature circuit breaker according to claim 6, characterized in that: After the circuit breaker is closed, the second end of the connecting rod abuts on the pressing and limiting surface. At this time, the included angle between the thrust direction generated by the handle on the second end of the connecting rod and the thrust direction generated by the pressing and limiting surface on the second end of the connecting rod is less than 180 degrees. The contact surface on the contact arm is L-shaped. A slope for facilitating the second end of the connecting rod to slide into the bending part is arranged below the contact surface. Grooves are arranged around the bottom of the sliding groove.

9. The miniature circuit breaker according to claim 7, It is characterized in that: After the circuit breaker is closed, the second end of the connecting rod abuts against the pressing and limiting surface. At this time, the included angle between the thrust direction generated by the handle on the second end of the connecting rod and the thrust direction generated by the pressing and limiting surface on the second end of the connecting rod is less than 180 degrees. The abutting surface on the abutting arm is L-shaped. A bending part inclined surface is arranged below the abutting surface for facilitating the sliding of the second end of the connecting rod into it. Grooves are arranged around the bottom of the sliding groove.

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