Electric leakage tripping mechanism on circuit breaker

Abstract

The utility model relates to an electric leakage tripping mechanism on a circuit breaker, which comprises a circuit breaker shell, a lock catch and an electric leakage tripper, the lock catch and the electric leakage tripper are arranged in the circuit breaker shell, the electric leakage tripper comprises an iron core and an ejector rod which slides synchronously with the iron core, and a pull rod is arranged in the circuit breaker shell. The pull rod comprises a fixed arm, a swing arm and an electric leakage pushing arm which are integrally formed or fixedly connected, the fixed arm is connected with the lock catch, the lock catch is provided with a movable space, the swing arm moves in the movable space, the electric leakage pushing arm is located above the ejector rod, and when the electric leakage pushing arm swings upwards under the driving of the ejector rod, the electric leakage pushing arm is driven by the ejector rod to move in the movable space. And the swing arm drives the lock catch to swing to realize tripping. By adopting the technical scheme, the electric leakage tripping mechanism on the circuit breaker is simple in structure and stable in transmission performance, and can quickly realize the swing of the lock catch to realize tripping.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a leakage tripping mechanism on a circuit breaker. Background Art

[0002] The leakage tripping mechanism of the existing circuit breaker includes a circuit breaker housing, a leakage tripping device and a linkage unit located in the circuit breaker housing, wherein the leakage tripping device includes a coil, a coil frame, a yoke and an iron core. The coil is wound on the coil frame, the coil frame is cylindrical, the yoke is arranged in a "U" shape, the two opposite sides of the yoke are sleeved on the two ends of the coil frame, the iron core is inserted into the coil frame, a push rod is arranged at one end of the iron core, and an opening for the push rod to enter and exit is arranged on the coil frame. This leakage tripping device has a large coil frame and is not convenient to install. In small (such as 18mm wide) leakage circuit breakers, the voltage coil and the current coil generally share a common iron core. However, the shared iron core will cause electromagnetic interference, and the iron core spring force will need to be increased due to the instantaneous action characteristics, which will cause the voltage coil to not operate. When leakage occurs, the iron core drives the lock of the circuit breaker to swing through the linkage unit to achieve tripping. There are many types of linkage units currently used, but the transmission performance is unstable, the installation is inconvenient, and the structure between the existing leakage release and the linkage unit is complicated. Summary of the invention

[0003] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a leakage tripping mechanism on a circuit breaker, which has a simple structure, stable transmission performance, and can quickly realize the swinging of the lock to achieve tripping.

[0004] The technical solution of the utility model is as follows: a leakage tripping mechanism on a circuit breaker comprises a circuit breaker housing, a lock and a leakage tripping device arranged in the circuit breaker housing, the leakage tripping device comprises an iron core and a top rod which slides synchronously with the iron core, a pull rod is arranged in the circuit breaker housing, the pull rod comprises a fixed arm, a swing arm and a leakage pushing arm which are integrally formed or fixedly connected, the fixed arm is connected to the lock, a movable space is arranged on the lock, the swing arm moves in the movable space, the leakage pushing arm is located above the top rod, and when the leakage pushing arm swings upward under the drive of the top rod, the swing arm drives the lock to swing to realize tripping.

[0005] By adopting the above technical solution, when leakage occurs in the line, the iron core and the top rod slide upward, pushing the leakage push arm located above the top rod to move upward, the swing arm of the pull rod swings synchronously, and drives the lock to swing, so that the lock is separated from the tripping buckle in the circuit breaker to achieve tripping. The transmission structure is simple, the transmission is convenient and fast, and quick tripping can be achieved.

[0006] The utility model is further configured as follows: a placement hole and a toggle boss are provided in the activity space, the fixed arm is inserted in the placement hole, and when the leakage current pushing arm swings upward under the drive of the push rod, the swing arm contacts the toggle boss to drive the lock to swing.

[0007] By adopting the above further arrangement, the range of movement of the pull rod is limited so that the swing arm can only move within the activity space. The pull rod will not affect the movement of other parts when swinging. The swing arm contacts the toggle boss to drive the lock to swing and achieve disengagement.

[0008] The utility model is further configured as follows: the circuit breaker housing comprises a base, a partition and an upper cover which are separately arranged, the partition is located between the base and the upper cover, the pull rod is located between the partition and the upper cover, and a movable groove for the pull rod to move is provided between the partition and the upper cover.

[0009] The above further configuration is adopted, and the split configuration is convenient for installing the components inside the circuit breaker housing. The movable groove on the partition is convenient for the pull rod to swing. After the upper cover is installed, the pull rod can be limited to prevent it from detaching.

[0010] The utility model is further configured as follows: the pull rod also includes a bimetallic push arm, which is located between the swing arm and the leakage push arm. A bimetallic strip is also provided in the circuit breaker housing, which is located on one side of the bimetallic swing arm and drives the bimetallic swing arm to swing when the bimetallic strip heats up and bends, so as to drive the lock to swing and realize tripping.

[0011] By adopting the above-mentioned further setting, when the line is overloaded, the bimetallic strip is deformed by heat, contacts the bimetallic push arm, and pushes the bimetallic push arm to swing, driving the lock to swing and achieve tripping, thereby cutting off the circuit. The bimetallic push arm is set in a "U" shape, one end is connected to the swing arm through a connecting arm, and the other end is connected to the leakage push arm. The bimetallic push arm is set vertically, and the connecting arm is parallel to the leakage push arm. The structural layout is reasonable, and does not affect the leakage releaser and the swing of the bimetallic strip drive rod.

[0012] The utility model is further configured as follows: the leakage release also includes a coil frame, the coil frame is provided with guide grooves and mounting grooves which are connected to each other, the upper end of the iron core is located in the mounting groove, the push rod is located in the guide groove, and the lower end extends into the mounting groove to connect with the iron core and slide synchronously.

[0013] The above-mentioned further configuration can guide the sliding of the iron core and the top rod, stabilize the structure during movement, better drive the pull rod to swing, and realize the lock release. The part of the iron core located outside the installation groove is provided with an iron core spring, which applies a reset force to the iron core.

[0014] The utility model is further configured as follows: a connecting rod is provided at the upper end of the iron core, a boss is provided on the connecting rod, a connecting hole is provided on the top rod, and the connecting rod is inserted into the connecting hole with an interference fit.

[0015] By adopting the above-mentioned further arrangement, the iron core and the push rod are closely matched, so that the push rod and the iron core can slide synchronously. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a specific embodiment of the utility model;

[0017] Figure 2 It is a cross-sectional view of a specific embodiment of the utility model;

[0018] Figure 3 This is a schematic diagram of the installation of the lock and the pull rod in a specific embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of a lock buckle according to a specific embodiment of the utility model;

[0020] Figure 5 It is a schematic diagram of a pull rod of a specific embodiment of the utility model;

[0021] Figure 6 It is a schematic diagram of a partition and a pull rod of a specific embodiment of the utility model;

[0022] Figure 7 This is a schematic diagram of a specific embodiment of the utility model after the pull rod swings;

[0023] Figure 8 This is a schematic diagram of a lock buckle after swinging in a specific embodiment of the utility model;

[0024] Fig. 9 This is a schematic diagram of a circuit breaker in a closed state in a specific embodiment of the utility model;

[0025] Fig.10 It is a schematic diagram of a specific embodiment of the utility model when it is tripped;

[0026] Fig.11 This is a schematic diagram of the installation of the leakage release and the circuit board in a specific embodiment of the utility model;

[0027] Fig.12 It is a schematic diagram of a coil skeleton and a coil in a specific embodiment of the utility model;

[0028] Fig.13 This is a schematic diagram of the connection between the iron core and the top rod in a specific embodiment of the utility model;

[0029] Fig.14 It is a schematic diagram of an iron core of a specific embodiment of the utility model;

[0030] Fig.15 It is a schematic diagram of a push rod according to a specific embodiment of the utility model.

[0031] In the figure, 1, circuit breaker housing; 11, base; 12, partition; 13, upper cover; 131, positioning block; 2, lock; 21, movable groove; 211, placement hole; 212, toggle boss; 3, leakage release; 31, coil frame; 311, guide groove; 312, installation groove; 32, coil; 33, iron core; 331, connecting rod; 3311, boss; 332, limit plate; 34, push rod; 341, connecting hole; 342, top block; 4, pull rod; 41, fixed arm; 42, swing arm; 43, leakage push arm; 44, bimetal push arm; 45, connecting arm; 5, circuit board; 6, iron core spring; 7, lock spring; 8, bimetallic sheet; 9, movable groove. DETAILED DESCRIPTION

[0032] The technical scheme in this embodiment will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. In the description of the present invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0035] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that technical personnel in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0036] like Figure 1-15As shown, a leakage tripping mechanism on a circuit breaker comprises a circuit breaker housing 1, a lock 2 and a leakage tripping device 3 arranged in the circuit breaker housing 1, wherein the leakage tripping device 3 comprises an iron core 33 and a top rod 34 that slides synchronously with the iron core 33, a pull rod 4 is arranged in the circuit breaker housing 1, and the pull rod 4 comprises a fixed arm 41 that is integrally formed or fixedly connected, a swing arm 42 and a leakage pushing arm 43, wherein the fixed arm 41 is connected to the lock 2, and the lock 2 is provided with an activity space 21, and the swing arm 42 is arranged in a space between the fixed arm 41 and the lock 2. It swings in the activity space 21. The leakage push arm 43 is located above the top rod 34. When the leakage push arm 43 swings upward under the drive of the top rod 34, the swing arm 42 drives the lock buckle 2 to swing to achieve tripping. When the line leaks electricity, the iron core and the top rod slide upward, pushing the leakage push arm located above the top rod to move upward. The swing arm of the pull rod swings synchronously and drives the lock buckle to swing, so that the lock buckle is separated from the trip buckle in the circuit breaker to achieve tripping. The structural layout is reasonable, the transmission structure is simple, the transmission is convenient and fast, and rapid tripping can be achieved. It also includes an iron core spring 6 for resetting the iron core 33 and a lock buckle spring 7 for resetting the lock buckle 2. The lock buckle 2 is provided with a mounting groove 312, and the lock buckle spring 7 is installed in the mounting groove 312.

[0037] Specifically, the driving structure between the swing arm 42 and the lock 2 is provided with a placement hole 211 and a toggle boss 212 in the movable space 21, and the fixed arm 41 is inserted in the placement hole 211. When the leakage push arm 43 swings upward under the drive of the top rod 34, the swing arm 42 contacts the toggle boss 212 to drive the lock 2 to swing, and the range of movement of the pull rod 4 is limited so that the swing arm 42 can only move in the movable groove 21. The pull rod 4 will not affect the movement of other parts when swinging. The swing arm 42 contacts the toggle boss 212 to drive the lock 2 to swing to achieve disengagement.

[0038] The circuit breaker housing 1 includes a base 11, a partition 12 and an upper cover 13 which are separately arranged. The partition 12 is located between the base 11 and the upper cover 13, and the pull rod 4 is located between the partition 12 and the upper cover 13. The partition 12 is provided with a movable groove 9 for the pull rod 4 to move. The split arrangement is convenient for the installation of various components inside the circuit breaker housing 1. The movable groove 9 on the partition 12 is convenient for the pull rod 4 to swing and can limit its swing angle. At the same time, a positioning block 131 is provided on the upper cover 13 corresponding to the position of the movable groove 9 to limit the pull rod 4 frontward and rearward to prevent it from detaching.

[0039] The pull rod 4 also includes a bimetal push arm 44, which is located between the swing arm 42 and the leakage push arm 43. A bimetal strip 8 is also provided in the circuit breaker housing 1. The bimetal strip 8 is located on one side of the bimetal swing arm 42, and drives the bimetal swing arm 42 to swing when the bimetal strip 8 heats up and bends, so as to drive the lock 2 to swing and achieve tripping. When the line is overloaded, the bimetal strip 8 is deformed by heat, contacts the bimetal push arm 44, and pushes the bimetal push arm 44 to swing, driving the lock 2 to swing and achieve tripping, thereby cutting off the circuit. The bimetal push arm 44 is set in a "U" shape, one end is connected to the swing arm 42 through a connecting arm 45, and the other end is connected to the leakage push arm 43. The bimetal push arm 44 is vertically set, and the connecting arm 45 is parallel to or in the same relative direction as the leakage push arm 43. The structural layout is reasonable, and does not affect the leakage release 3 and the bimetal strip 8 driving the pull rod 4 to swing.

[0040] The leakage release 3 also includes a coil skeleton 31 and a coil 32 sleeved on the coil skeleton 31. The coil skeleton 31 is provided with a guide groove 311 and a mounting groove 312 that are connected to each other. The upper end of the iron core 33 is located in the mounting groove 312. The push rod 34 is located in the guide groove 311, and the lower end extends into the mounting groove 312 to connect with the iron core 33 and slide synchronously. When the iron core 33 and the push rod 34 slide upward, the upper end surface of the push rod 34 pushes the pull rod 4, and the pull rod 4 drives the lock 2 to swing to achieve release. When the line is short-circuited or overloaded, the circuit board 5 sends a trigger command to turn on the coil, so that it generates a magnetic field, which prompts the iron core 33 and the push rod 34 to slide upward, and pushes the pull rod 4 located above the push rod 34 to move upward. The other end of the push rod 34 presses the lock 2, so that the lock 2 swings and separates from the trip buckle in the circuit breaker to achieve release. The upper end of the iron core 33 is provided with a connecting rod 331, and a boss 3311 is provided on the connecting rod 331. A connecting hole 341 is provided on the push rod 34. The connecting rod 331 is inserted into the connecting hole 341 with an interference fit. A limiting plate 332 is provided at the lower end of the iron core 33. The iron core 33 spring is sleeved on the iron core 33, and the two ends are respectively set to abut against the limiting plate 332 and the coil skeleton 31. The iron core 33 and the push rod 34 are tightly matched to facilitate the synchronous sliding of the push rod 34 and the iron core 33.

Claims

1. A leakage tripping mechanism on a circuit breaker, comprising a circuit breaker housing (1), a lock (2) and a leakage tripping device (3) arranged in the circuit breaker housing (1), wherein the leakage tripping device (3) comprises an iron core (33) and a top rod (34) that slides synchronously with the iron core, characterized in that: A pull rod (4) connected to the lock is provided in the circuit breaker housing (1), and the pull rod (4) comprises a fixed arm (41) formed in one piece or fixedly connected, a swing arm (42) and a leakage current pushing arm (43), the fixed arm (41) is connected to the lock (2), an activity space (21) is provided on the lock (2), the swing arm (42) is movably arranged in the activity space (21), and the leakage current pushing arm (43) is located above the top rod (34), and when the leakage current pushing arm (43) swings upward under the drive of the top rod (34), the swing arm (42) drives the lock (2) to swing to achieve release.

2. The leakage tripping mechanism on the circuit breaker according to claim 1, characterized in that: A placement hole (211) and a toggle boss (212) are provided in the activity space (21), and the fixed arm (41) is inserted into the placement hole (211). When the leakage push arm (43) is driven by the push rod (34) to swing upward, the swing arm (42) contacts the toggle boss (212) to drive the lock buckle (2) to swing.

3. The leakage tripping mechanism on the circuit breaker according to claim 1 or 2, characterized in that: The circuit breaker housing (1) comprises a base (11), a partition (12) and an upper cover (13) which are arranged separately; the partition (12) is located between the base (11) and the upper cover (13); the pull rod (4) is located between the partition (12) and the upper cover (13); and a movable groove (9) for the leakage current pushing arm (43) to move is provided on the partition (12).

4. The leakage tripping mechanism on the circuit breaker according to claim 1 or 2, characterized in that: The pull rod (4) further comprises a bimetallic push arm (44), wherein the bimetallic push arm (44) is located between the swing arm (42) and the leakage push arm (43). A bimetallic strip (8) is also provided in the circuit breaker housing (1), wherein the bimetallic strip (8) is located on one side of the bimetallic swing arm (42), and when the bimetallic strip (8) heats up and bends, the bimetallic swing arm (42) is driven to swing, thereby driving the lock (2) to swing and realize release.

5. The leakage tripping mechanism on the circuit breaker according to claim 1 or 2, characterized in that: The leakage release (3) further comprises a coil frame (31), the coil frame (31) being provided with a guide groove (311) and a mounting groove (312) which are in electrical communication with each other, the upper end of the iron core (33) being located in the mounting groove (312), the push rod (34) being located in the guide groove (311), and the lower end extending into the mounting groove (312) to be connected to the iron core (33) and to slide synchronously.

6. The leakage tripping mechanism on the circuit breaker according to claim 5, characterized in that: A connecting rod (331) is provided at the upper end of the iron core (33), a boss (3311) is provided on the connecting rod (331), a connecting hole (341) is provided on the top rod (34), and the connecting rod (331) is inserted into the connecting hole (341) with an interference fit.

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