A circuit breaker anti-moving contact bounce structure

Abstract

The present invention provides a structure for preventing a moving contact from bouncing for a circuit breaker, comprising: a moving contact in an open state in which the moving contact moves away from the static contact when a large current is interrupted; a trip latch rotatably mounted on a circuit breaker bracket, having a locking position in which the moving contact is locked in cooperation with the trip latch when the moving contact is opened to a certain position to prevent the moving contact from falling, and an unlocking position in which the trip latch is unlocked from the moving contact by a handle. When a large current is interrupted, the trip latch can be locked in cooperation with the moving contact when the moving contact is opened to a certain position to prevent the moving contact from falling, thereby facilitating the arc from entering the arc extinguishing chamber. This has a good arc extinguishing effect and avoids the re-arcing caused by the bounce of the moving contact in the prior art, thereby improving the reliability of the circuit breaker and extending its service life. After the fault is eliminated, the trip latch is driven by the handle to unlock the moving contact, thereby enabling normal manual opening and closing operations.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a moving contact bounce prevention structure of a circuit breaker. Background Art

[0002] Molded case circuit breaker is a type of circuit breaker that can automatically cut off the current when the current exceeds the trip setting. It has protection functions such as long delay for overload and instantaneous short circuit. It can also be used in conjunction with modular units such as leakage circuit breaker, measurement, and electric operating mechanism.

[0003] When interrupting a large current, the moving contact of the circuit breaker will collide with the limit baffle of the circuit breaker under the action of the contact spring force, the operating mechanism tripping spring force, the electric repulsion force, etc., resulting in bouncing. When the moving contact rebounds, the distance between it and the static contact is shortened, so that the arc between the moving and static contacts is not elongated, making it difficult for it to enter the arc extinguishing chamber, affecting the arc extinguishing effect; in addition, when the gap between the moving and static contacts is reduced to a certain extent, the air between the moving and static contacts will be ionized again, resulting in arcing, which affects the reliability and service life of the product. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the moving contact will bounce when breaking a large current, affecting the reliability and service life of the product, thereby providing a highly reliable anti-moving contact bounce structure for a circuit breaker.

[0005] To this end, the present invention provides a structure for preventing a moving contact from bouncing for a circuit breaker, comprising a moving contact and a trip latch, wherein the moving contact has a repelled state in which it moves away from a stationary contact when a large current is interrupted; the trip latch is rotatably mounted on a circuit breaker bracket and has a locked position in which it cooperates with the moving contact to lock when the moving contact is repelled to a certain position to prevent the moving contact from falling, and an unlocked position in which it is driven by a handle to unlock the moving contact.

[0006] A first locking tooth is provided on a side of the jump buckle facing the moving contact, and a snap-on structure that can be locked with the first locking tooth is provided on the moving contact.

[0007] The latch structure includes a latch and a first biasing member, the latch being movably mounted on the moving contact and having a second locking tooth that cooperates and locks with the first locking tooth of the jumper; a first biasing member, one end of which is against the moving contact and the other end of which is against the latch, and the first biasing member applies a biasing force toward the latch to cause the second locking tooth to cooperate and lock with the first locking tooth; during the process of the moving contact being repelled, the latch contacts the front end surface of the first locking tooth of the jumper, and passes over the transition surface of the first locking tooth along the front end surface and is locked with its hook portion.

[0008] The front end surface and the transition surface are arc surfaces or inclined surfaces.

[0009] The moving contact is formed with a first installation groove suitable for installing the latch, and a first rotating shaft around which the latch can rotate is provided in the first installation groove, and the second locking tooth can extend from the top opening of the installation groove.

[0010] The first biasing member is a torsion spring sleeved on the first rotating shaft, one end of the torsion spring abuts against the inner wall of the first mounting slot, and the other end abuts against the locking member.

[0011] The fastener has two mounting arms arranged opposite to each other, and a second mounting slot arranged between the two mounting arms. A through hole is formed on the mounting arm for the first rotating shaft to pass through. The torsion spring is sleeved on the first rotating shaft located between the two mounting arms, and its other end is against the top wall of the second mounting slot.

[0012] A lever linked to the handle is rotatably mounted on the bracket, and the lever drives the jump buckle and the buckle structure to unlock through a combination structure.

[0013] The combining structure comprises a protrusion arranged on the top of the jump buckle, and a driving block arranged on the lever and capable of driving the protrusion to move.

[0014] The trip button also has a re-locking position driven by the handle and locked with the lock of the circuit breaker operating mechanism, wherein when a large current is disconnected, the tripping mechanism drives the lock to unlock the trip button.

[0015] The jump buckle is locked with the lock buckle through a clamping structure, and the clamping structure includes a clamping block provided on the right side of the top of the jump buckle, and a blocking surface provided on the lock buckle and cooperating with the clamping block to block.

[0016] The technical solution of the present invention has the following advantages:

[0017] 1. The anti-moving contact bounce structure of the circuit breaker provided by the present invention can prevent the moving contact from falling when the moving contact is pushed to a certain position during high current interruption. This structure prevents the moving contact from falling, thereby facilitating the arc to enter the arc extinguishing chamber. This has a good arc extinguishing effect and avoids the re-arcing caused by the bounce of the moving contact in the prior art, thereby improving the reliability of the circuit breaker and extending its service life. After the fault is eliminated, the tripping lock and the moving contact are unlocked by driving the handle, so that manual opening and closing operations can be carried out normally.

[0018] 2. The anti-bounce structure of the moving contact of the circuit breaker provided by the present invention is that the inventor cleverly designs a first locking tooth that cooperates with the buckle structure to lock on the original tripping structure of the circuit breaker. This simplifies the structure and reduces production costs.

[0019] 3. The anti-bouncing structure of the moving contact of the circuit breaker provided by the present invention includes a latch structure including a latch and a first biasing member. During the process of the moving contact being repelled, the latch contacts the front end surface of the first lock tooth of the trip latch, and passes over the transition surface of the first lock tooth along the front end surface and is locked with its hook portion. The above-mentioned latch structure has the advantage of simple structure.

[0020] 4. The anti-moving contact bounce structure of the circuit breaker provided by the present invention has a front end surface and a transition surface that are arc surfaces or inclined surfaces, which reduces the wear between the latch and the tripping buckle and extends the service life.

[0021] 5. The circuit breaker anti-bounce structure provided by the present invention features a first mounting groove formed on the movable contact for mounting a latch. A first rotating shaft, around which the latch rotates, is located within the first mounting groove, and a second locking tooth extends from the top opening of the mounting groove. The first mounting groove effectively utilizes the space available on the movable contact, allowing the main body of the latch to be mounted within the first mounting groove, resulting in a more compact structure.

[0022] 6. The anti-moving contact bounce structure of the circuit breaker provided by the present invention comprises a combined structure including a protrusion provided on the top of the tripper, and a driving block provided on the lever that can drive the protrusion to move. When the tripper needs to be unlocked from the latch structure, the handle drives the lever to rotate clockwise, and the inner side surface of the driving block abuts against the protrusion, thereby driving the tripper to rotate clockwise, so that the first locking tooth of the tripper and the second locking tooth of the latch are unlocked.

[0023] 7. The anti-moving contact bounce structure of the circuit breaker provided by the present invention has a tripping latch that is driven by the handle and locked in a re-locking position in cooperation with the lock latch of the circuit breaker operating mechanism. In this way, when a high current occurs, the tripping mechanism drives the lock latch and the tripping latch to unlock, and the operating mechanism drives the moving contact and the static contact to separate and disconnect, thereby cutting off the fault circuit and ensuring the safety of equipment and personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a structural schematic diagram of the anti-moving contact bounce structure of the circuit breaker of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure after removing the circuit breaker base;

[0027] Figure 3 A schematic diagram of the structure in which the moving contact and the tripping buckle of the anti-moving contact bounce structure remain locked;

[0028] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A;

[0029] Figure 5 This is a schematic diagram of the assembly of the moving contact and the snap-fit structure;

[0030] Figure 6 Schematic diagram of the explosion structure of the moving contact and the snap-fit structure;

[0031] Figure 7 is a three-dimensional diagram of a fastener;

[0032] Figure 8 This is a schematic diagram of the assembly of the lever and the jump button;

[0033] Figure 9 This is an exploded diagram of the lever and the jump button;

[0034] Figure 10 A schematic diagram of the structure of the movable contact anti-bounce structure when the movable contact is in the repelled state;

[0035] Figure 11 for Figure 10 Schematic diagram of the enlarged structure of part B;

[0036] Figure 12 This is a structural diagram of the anti-moving contact bounce structure when the tripping latch is in the re-latching position;

[0037] Figure 13 for Figure 12 Schematic diagram of the enlarged structure of part C.

[0038] Explanation of the accompanying drawings: 1. Moving contact; 11. First mounting groove; 12. First rotating shaft; 2. Static contact; 3. Jumper; 31. First locking tooth; 32. Front end face; 33. Transition surface; 34. Protrusion; 35. Block; 4. Bracket; 42. Second rotating shaft; 43. Third rotating shaft; 5. Handle; 6. Buckle; 61. First biasing member; 62. Second locking tooth; 63. Mounting arm; 64. Second mounting groove; 7. Lever; 71. Drive block; 8. Lock; 81. Blocking surface; 9. Tripping mechanism. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0042] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0043] Example

[0044] This embodiment provides a circuit breaker anti-moving contact bounce structure, such as Figure 1 and 2 As shown, it includes a trip buckle 3, a moving contact 1, a static contact 2, a snap structure, a bracket 4 and a lock buckle 8.

[0045] The trip latch 3 is rotatably mounted on the circuit breaker bracket 4 via the second rotating shaft 42. It has a locked position in which the movable contact 1 is locked with the trip latch 8 when the movable contact 1 is opened to a certain position to prevent the movable contact 1 from falling, an unlocked position in which the trip latch 3 is unlocked with the movable contact 1 by the handle 5, and a re-locked position in which the trip latch 8 of the circuit breaker operating mechanism is locked by the handle 5. It should be noted that the certain position refers to the movable contact being opened to the limit position or near the limit position. Figure 3 、 4 As shown in Figures 8 and 9, the bottom surface of the jump buckle 3 is provided with a first locking tooth 31, and a protrusion 34 is provided on the left side of its top, and a clamping block 35 is provided on the right side of the top, that is, the protrusion 34, the clamping block 35 and the rotation center of the jump buckle are distributed in a triangular shape, and the first locking tooth 31 is provided with a front end face 32 and a transition face 33 that contact the fastener 6. In this embodiment, the front end face 32 and the transition face 33 are arc surfaces or inclined surfaces.

[0046] The moving contact 1 has a repelling state in which it moves away from the static contact 2 when a large current is interrupted. Figure 5 and 6 As shown, a first installation groove 11 suitable for installing the latch 6 is formed on the moving contact 1, and a first rotating shaft 12 around which the latch 6 can rotate is provided in the first installation groove 11.

[0047] The buckle structure includes a buckle member 6 and a first biasing member 61 .

[0048] The fastener 6 is movably mounted on the moving contact 1. Figure 5-7 As shown, the top of the movable contact 1 has a second locking tooth 62 that locks with the first locking tooth 31 of the jumper 3, and the bottom has two mounting arms 63 that are opposite to each other, and a second mounting groove 64 between the two mounting arms 63. The mounting arms 63 are formed with a through hole for the first rotating shaft 12 to pass through. Figure 10 and 11 As shown, the latch 6 contacts the front end surface 32 of the first locking tooth 31 of the jump buckle 3, and passes over the transition surface 33 of the first locking tooth 31 along the front end surface 32 and is locked with its hook portion.

[0049] One end of the first biasing member 61 abuts against the movable contact 1 and the other end abuts against the latch 6. The first biasing member 61 applies a biasing force toward the latch 6, causing the second locking teeth 62 to engage and lock with the first locking teeth 31. In this embodiment, the first biasing member 61 is a torsion spring, which is sleeved on the first rotating shaft 12 between the two mounting arms 63, with one end abutting against the inner wall of the first mounting slot 11 and the other end abutting against the top wall of the second mounting slot 64.

[0050] A lever 7 linked to the handle 5 and a lock buckle 8 locked with the jump buckle 3 are rotatably mounted on the bracket 4 .

[0051] Lever 7 is fixedly connected to handle 5, as shown Figure 8 and 9 As shown, a driving block 71 is provided on it which can drive the protrusion 34 to move, wherein, when the jump buckle 3 needs to be unlocked from the buckle structure, the handle 5 drives the lever 7 to rotate clockwise, and the inner side surface of the driving block 71 abuts against the protrusion 34, thereby driving the jump buckle 3 to rotate clockwise, so that the first locking tooth 31 of the jump buckle 3 is unlocked from the second locking tooth 62 of the buckle 6.

[0052] The lock buckle 8 is rotatably mounted on the bracket 4 via the third rotating shaft 43. Figure 12 and 13As shown, the trip latch 3 is locked with the lock catch 8 via a snap-fit structure. The snap-fit structure includes a block 35 located on the top right side of the trip latch 3 and a blocking surface 81 located on the lock catch 8 and blocking the block 35. When interrupting a high current, a trip mechanism 9 drives the lock catch 8 to unlock the trip latch 3. It should be noted that the trip mechanism 9 is a mature technology, so its specific structure and working principle will not be described in detail.

[0053] The working principle of the anti-moving contact bounce structure of the circuit breaker of the present invention is as follows:

[0054] When the circuit breaker is in normal operation, trip 3 is in Figure 13 Re-fastening position shown.

[0055] When a high current is encountered, the tripping mechanism 9 drives the lock 8 to unlock the tripping button 3, and the moving contact 1 is repelled from the static contact 2 under the action of the contact spring force, the operating mechanism opening spring force, and the electric repulsion force. Figure 11 As shown, the latch 6 contacts the front end surface 32 of the first locking tooth 31 of the jump buckle 3, and passes over the transition surface 33 of the first locking tooth 31 along the front end surface 32 and is locked with its hook portion.

[0056] When the high current fault is eliminated, the manual driving handle 5 is rotated clockwise, and the inner side surface of the driving block 71 is against the protrusion 34, thereby driving the trip buckle 3 to rotate clockwise, so that the first locking tooth 31 of the trip buckle 3 and the second locking tooth 62 of the latch 6 are unlocked, and then the trip buckle 3 is driven to reset to the re-locking position.

[0057] The anti-moving contact bounce structure of the circuit breaker provided by the present invention can prevent the moving contact 1 from falling when a large current is disconnected because the trip button 3 can cooperate with the moving contact 1 to lock when the moving contact 1 is repelled to a certain position, thereby facilitating the arc to enter the arc extinguishing chamber. This has a good arc extinguishing effect and avoids the re-arcing caused by the bouncing of the moving contact 1 in the prior art, thereby improving the reliability of the circuit breaker and extending the service life; and when the fault is eliminated, the trip button 3 is driven by the handle 5 to unlock the moving contact 1, so that manual opening and closing operations can be carried out normally.

[0058] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A circuit breaker anti-moving contact bounce structure, characterized in that: include: The movable contact (1) has a repelling state in which it moves away from the stationary contact (2) when a large current is interrupted; A trip button (3) is rotatably mounted on a circuit breaker bracket (4) and has a locking position in which the movable contact (1) is locked in cooperation with the movable contact (1) when the movable contact (1) is pushed open to a certain position to prevent the movable contact (1) from falling, and an unlocking position in which the movable contact (1) is unlocked by a handle (5); A first locking tooth (31) is provided on a side of the jump buckle (3) facing the moving contact (1), and a buckle structure capable of cooperating and locking with the first locking tooth (31) is provided on the moving contact (1); A lever (7) linked to the handle (5) is rotatably mounted on the bracket (4); the lever (7) drives the jump buckle (3) to unlock with the buckle structure through a combined structure.

2. The anti-moving contact bounce structure of the circuit breaker according to claim 1, characterized in that: The buckle structure includes: A latch (6) is movably mounted on the moving contact (1) and has a second locking tooth (62) that cooperates with and locks the first locking tooth (31) of the jumper (3); a first biasing member (61), one end of which abuts against the moving contact (1) and the other end of which abuts against the latch member (6), wherein the first biasing member (61) applies a biasing force toward the latch member (6) so as to engage and lock the second locking tooth (62) with the first locking tooth (31); During the process of the moving contact (1) being disengaged, the latch (6) contacts the front end surface (32) of the first locking tooth (31) of the jumper (3), passes over the transition surface (33) of the first locking tooth (31) along the front end surface (32), and is locked with its hook portion.

3. The anti-moving contact bounce structure of the circuit breaker according to claim 2, characterized in that: The front end surface (32) and the transition surface (33) are arc surfaces or inclined surfaces.

4. The anti-moving contact bounce structure of the circuit breaker according to claim 2 or 3, characterized in that: A first mounting groove (11) suitable for mounting the latch (6) is formed on the movable contact (1), a first rotating shaft (12) around which the latch (6) can rotate is provided in the first mounting groove (11), and the second locking tooth (62) can extend from the top opening of the mounting groove.

5. The anti-moving contact bounce structure of the circuit breaker according to claim 4, characterized in that: The first biasing member (61) is a torsion spring sleeved on the first rotating shaft (12), one end of the torsion spring abuts against the inner wall of the first mounting groove (11), and the other end abuts against the locking member (6).

6. The anti-moving contact bounce structure of the circuit breaker according to claim 5, characterized in that: The latch (6) has two mounting arms (63) arranged opposite to each other, and a second mounting slot (64) arranged between the two mounting arms (63). A through hole is formed on the mounting arm (63) for the first rotating shaft (12) to pass through. The torsion spring is sleeved on the first rotating shaft (12) located between the two mounting arms (63), and the other end thereof abuts against the top wall of the second mounting slot (64).

7. The anti-moving contact bounce structure of the circuit breaker according to claim 1, characterized in that: The combining structure comprises a convex block (34) arranged on the top of the jump buckle (3), and a driving block (71) arranged on the lever (7) and capable of driving the convex block (34) to move.

8. The anti-moving contact bounce structure of the circuit breaker according to claim 7, characterized in that: The trip button (3) also has a re-locking position driven by the handle (5) and locked in cooperation with the lock button (8) of the circuit breaker operating mechanism, wherein, when a large current is disconnected, the tripping mechanism (9) drives the lock button (8) to unlock the trip button (3).

9. The anti-moving contact bounce structure of the circuit breaker according to claim 8, characterized in that: The jump buckle (3) is locked in cooperation with the lock buckle (8) through a clamping structure, wherein the clamping structure comprises a clamping block (35) provided on the right side of the top of the jump buckle (3), and a blocking surface (81) provided on the lock buckle (8) and cooperating with the clamping block (35) to block.

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