A locking device for circuit breaker

Abstract

The present invention relates to a circuit breaker, in particular to a locking device inside the circuit breaker. The present invention adopts the following technical scheme: a locking device for a circuit breaker, characterized in that: a slide groove is provided at the upper end of the moving contact mounting seat, the slide groove includes a curved portion and a straight portion, the first end of the connecting rod is connected to the handle, the second end of the connecting rod is placed in the slide groove, and a fork is provided at the upper end of the lock. After the circuit breaker is disconnected, the fork and the curved portion of the slide groove cooperate to lock the second end of the connecting rod, and at this time, the handle can be pushed to close the circuit breaker; after the circuit breaker is closed, the offline mechanism of the circuit breaker acts on the lock to rotate the lock, and the fork loses the lock on the second end of the connecting rod, and at this time, the second end of the connecting rod slides into the straight portion of the slide groove to disconnect the circuit breaker; by adopting the above scheme, the present invention overcomes the problems existing in the prior art and provides a new type of locking device that can reduce parts, remove tripping buckles, and reduce the tripping force of the product through mechanical principles and mechanics.

Description

Technical Field

[0001] The invention relates to a circuit breaker, in particular to a locking device inside the circuit breaker. Background Art

[0002] The locking mechanism of existing circuit breaker products is generally provided with a lever, a lock and a trip button, which has a complex structure and high cost. The size of the trip button is not conducive to automated assembly, and the product has many parts, which poses a risk of product failure. Summary of the invention

[0003] The present invention overcomes the problems existing in the prior art and provides a novel locking device which can reduce parts, eliminate buckle jumps and reduce the release force of the product through mechanical principles and mechanics principles.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a locking device of a circuit breaker, characterized in that it includes a moving contact mechanism, a lock, a handle and a connecting rod, the moving contact mechanism includes a moving contact mounting seat and a moving contact, the handle is installed on the housing of the circuit breaker, the lock is rotatably arranged on the moving contact mounting seat, a slide groove is arranged at the upper end of the moving contact mounting seat, the slide groove includes a curved portion and a straight portion, one end of the curved portion is connected with the straight portion, and a pressing surface is arranged at the other end of the curved portion, the first end of the connecting rod is connected to the handle, the second end of the connecting rod is placed in the slide groove, and a pressing arm is arranged at the upper end of the lock, and after the circuit breaker is disconnected, the pressing arm cooperates with the curved portion of the slide groove to lock the second end of the connecting rod, and the position of the first end of the connecting rod on the handle is lower than that of the connecting rod. The second end of the connecting rod is in the position of the bending part, and the handle can be pushed to close the circuit breaker at this time. During the closing process, the second end of the connecting rod contacts the pressing surface. After the circuit breaker is closed, the second end of the connecting rod contacts the pressing surface. After closing, the angle between the thrust direction of the handle on the second end of the connecting rod and the resistance direction of the pressing surface on the second end of the connecting rod is always less than 180 degrees. The combined force on the second end of the connecting rod generated by the thrust and the resistance force is upward, and the resistance arm of the lock contacts the top of the connecting rod. The resistance force of the resistance arm on the second end of the connecting rod is balanced with the combined force to realize that the second end of the connecting rod is placed in the bending part and contacts the pressing surface. When the lock is actuated, the lock rotates and the resistance arm loses the resistance to the second end of the connecting rod. At this time, the second end of the connecting rod slides into the straight part of the slide slot to realize the disconnection of the circuit breaker.

[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. After the circuit breaker is opened, the position of the first end of the connecting rod on the handle is lower than the position of the second end of the connecting rod on the curved portion, so that the movable contact mounting seat can be rotated when the handle is pushed later. After the circuit breaker is closed, the second end of the connecting rod abuts against the pressing surface. During the closing process and after the circuit breaker is closed, the angle between the thrust direction of the handle on the second end of the connecting rod and the direction of the resistance force of the pressing surface on the second end of the connecting rod is always less than 180 degrees. The purpose of such a setting is to make the resultant force generated after the thrust and the resistance force offset a part upward. At this time, the resistance arm just abuts against the second end of the connecting rod, so the second end of the connecting rod can be well fixed in the curved portion of the slide groove. In addition, when the lock rotates the resistance arm to leave the position of the second end of the connecting rod, the resultant force generated by the thrust and the resistance force will push the second end of the connecting rod to move upward into the straight portion of the slide groove, so that the movable contact mounting seat will rotate to realize opening.

[0006] A further configuration of the present invention is that a pushing arm is provided below the pressing arm of the lock, a fork is formed between the pressing arm and the pushing arm, the bottom of the fork is U-shaped, the upper side of the fork is a contact surface, the lower side of the fork is a pushing surface, the opening of the fork is larger than the diameter of the second end of the connecting rod, when the contact surface contacts the second end of the connecting rod, the pushing surface leaves the second end of the connecting rod, and when the contact surface leaves the second end of the connecting rod, the pushing surface can push the second end of the connecting rod.

[0007] By adopting the above scheme, the bottom of the fork is U-shaped, so that after the circuit breaker is disconnected, the U-shaped mouth can well lock the second end of the connecting rod in the curved part of the slide slot, and a resisting force is generated between the contact surface and the second end of the connecting rod during the closing process of the circuit breaker to prevent the second end of the connecting rod from moving, so that the second end of the connecting rod is locked in the curved part when the lock is not subjected to external force; when the circuit breaker needs to be disconnected after closing, the lever arm can also assist in shifting the second end of the connecting rod, which can well prevent the problem of the circuit breaker not operating after the impurities adhere to the second end of the connecting rod.

[0008] A further arrangement of the present invention is that the pressure arm and the push arm are staggered, a notch is provided above the slide groove of the moving contact mounting seat, the pressure arm can be inserted into the notch, a boss is provided below the slide groove of the moving contact mounting seat, the push arm can be placed on the outer surface of the boss, and a portion of the upper side surface of the boss is connected to the lower side surface of the curved portion of the slide groove to form a pressure surface.

[0009] By adopting the above scheme, the pressure arm and the push arm are staggered, so that the connection and cooperation with the moving contact mounting seat are more reasonable and the volume is small; the upper side surface of the boss is connected to the lower side surface of the curved portion of the slide groove to form a pressure surface, so that the pressure surface is made as large as possible, so that the second end of the connecting rod cooperates with the pressure surface more stably.

[0010] The final setting of the present invention is: an inclined surface is provided on the end of the pressure arm for the second end of the connecting rod to slide into the curved portion, a convex column is provided in the middle of the moving contact mounting seat, and arc-shaped bosses are evenly provided around the convex column, a circular through hole is provided on the lock buckle, and the circular through hole is sleeved on the outer periphery of the arc-shaped boss to realize the rotational cooperation between the lock buckle and the moving contact mounting seat, a paddle and an arc isolation sheet are provided below the lock buckle, an inclined push surface is provided on the side of the lock buckle located above the circular through hole, and an arc surface for the push rod of the circuit breaker releaser to push is provided on the side below the circular through hole.

[0011] By adopting the above scheme, the inclined surface is set to facilitate the second end of the connecting rod to slide into the curved part of the slide groove. Of course, the inclined surface can also be not set, and only the arc-shaped transition angle can be set. The moving contact mounting seat and the lock buckle adopt the above method to achieve rotational cooperation, which can effectively prevent dust or impurities from adhering to the lock buckle and the moving contact mounting seat and affecting the normal operation of the circuit breaker. The purpose of the paddle and arc isolation plate set below the lock buckle is to enable the double metal pull rod to work and isolate the arc. The side of the lock buckle is located above the circular through hole and is provided with an inclined push surface, the purpose of which is to facilitate the push of the lock buckle push rod. The side is located below the circular through hole and is provided with an arc surface for the push rod of the circuit breaker releaser to push, so as to facilitate the push of the releaser.

[0012] The present invention will be further described below in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of the lock buckle of the product of the embodiment of the present invention in the disconnected position;

[0014] Figure 2 This is a structural diagram of the lock buckle of the product of the embodiment of the present invention when it is just closed;

[0015] Figure 3 This is a structural diagram of the lock buckle of the product of the embodiment of the present invention during the closing process;

[0016] Figure 4 This is a structural diagram of the lock of the product of the embodiment of the present invention after closing;

[0017] Figure 5 This is a structural diagram of the lock when the product of the embodiment of the present invention is about to be released;

[0018] Figure 6 This is a structural diagram of the lock of the product of the embodiment of the present invention when forced to trip;

[0019] Figure 7 This is a structural diagram of the lock during the process of the handle returning to its original position after the product of the embodiment of the present invention is released;

[0020] Figure 8 This is a structural diagram of the lock when the moving contact of the product of the embodiment of the present invention is knocked open by the electromagnetic mechanism when the short circuit occurs;

[0021] Fig. 9 It is a structural diagram of the lock when the movable contact of the product of the embodiment of the present invention is knocked open by the electromagnetic mechanism during a short circuit and the contact bounces open but the handle does not return to its original position;

[0022] Fig.10 This is a three-dimensional diagram of a lock according to an embodiment of the present invention;

[0023] Fig.11 A three-dimensional diagram of the installation of a moving contact according to an embodiment of the present invention;

[0024] Fig.12 It is a schematic diagram of the force applied to the handle and the abutment surface on the second end of the connecting rod after the switch is closed according to an embodiment of the present invention;

[0025] Fig.13 for Fig.12 Force analysis diagram of . DETAILED DESCRIPTION

[0026] like Figure 1-Figure 13 As shown, a locking device of a circuit breaker includes a moving contact mechanism 1, a lock 2, a handle 3 and a connecting rod 4, wherein the moving contact mechanism 1 includes a moving contact mounting seat 11 and a moving contact 12, the handle 3 is mounted on the housing of the circuit breaker, the lock 2 is rotatably arranged on the moving contact mounting seat 11, and a slide groove 111 is arranged at the upper end of the moving contact mounting seat 11, the slide groove 111 includes a curved portion 1111 and a straight portion 1112, one end of the curved portion 1111 is connected with the straight portion 1112, and the curved portion 1111 is connected with the straight portion 1112. The other end of the curved portion 1111 is provided with a pressing surface 11111, the first end of the connecting rod 4 is connected to the handle 3, the second end of the connecting rod 4 is placed in the slide groove 111, and the upper end of the lock buckle 2 is provided with a pressing arm 212. After the circuit breaker is disconnected, the pressing arm 212 cooperates with the curved portion 1111 of the slide groove 111 to lock the second end of the connecting rod 4, and the position of the first end of the connecting rod 4 on the handle 3 is lower than the position of the second end of the connecting rod 4 on the curved portion 1111. The height of the position here is determined by the attachment. Figure 1 The handle 3 is in the position according to which the circuit breaker can be closed. At this time, the handle 3 can be pushed to close the circuit breaker. During the closing process, the second end of the connecting rod 4 abuts against the pressing surface 11111. After the circuit breaker is closed, the second end of the connecting rod 4 abuts against the pressing surface 11111. After closing, the angle between the thrust F1 direction of the handle 3 on the second end of the connecting rod 4 and the abutment F2 direction of the pressing surface 11111 on the second end of the connecting rod 4 is always less than 180 degrees. Fig.12 and 13As shown, the resultant force F3 on the second end of the connecting rod 4 generated by the thrust F1 and the resistance force F2 is upward, and the pressing arm 212 of the lock buckle 2 is in resistance above the connecting rod 4. The pressing force of the pressing arm 212 on the second end of the connecting rod 4 is balanced with the resultant force F3, so that the second end of the connecting rod 4 is placed in the curved portion 1111 and in resistance against the resistance surface 11111. When the lock buckle 2 is actuated, the lock buckle 2 rotates and the pressure arm 212 loses its resistance to the second end of the connecting rod 4. At this time, the second end of the connecting rod 4 slides into the straight portion 1112 of the slide groove 111 to disconnect the circuit breaker. By adopting the above scheme, a new method is adopted to lock or unlock the second end of the connecting rod 4 to realize the action of closing or disconnecting the circuit breaker. The above method is easy to install, stable in operation, and will not cause malfunction; after the circuit breaker is closed, the second end of the connecting rod 4 contacts the pressing surface 11111. At this time, the angle between the direction of the thrust F1 of the handle 3 on the second end of the connecting rod 4 and the direction of the resistance force F2 of the pressing surface 11111 on the second end of the connecting rod 4 is less than 180 degrees. The purpose of this setting is to make the thrust F1 and the resistance force F2 offset by part of the generated force F3 upward. At this time, the resistance arm 212 just contacts the second end of the connecting rod 4, so the second end of the connecting rod 4 can be well fixed in the curved part 1111 of the slide groove. In addition, when the lock buckle 2 rotates the resistance arm 212 to leave the position of the second end of the connecting rod 4, the force F3 generated by the thrust F1 and the resistance force F2 will push the second end of the connecting rod 4 to move upward into the straight part 1112 of the slide groove, so that the moving contact mounting seat will rotate to realize the opening.

[0027] In the embodiment of the present invention, a pushing arm 213 is arranged below the pressing arm 212 of the lock buckle 2, and a fork 21 is formed between the pressing arm 212 and the pushing arm 213. The bottom of the fork 21 is U-shaped 211, the upper side of the fork 21 is a contact surface 2111, and the lower side of the fork 21 is a pushing surface 2112. The opening of the fork 21 is larger than the diameter of the second end of the connecting rod 4. When the contact surface 2111 contacts the second end of the connecting rod 4, the pushing surface 2112 leaves the second end of the connecting rod 4. When the contact surface 2111 leaves the second end of the connecting rod 4, the pushing surface 2112 can push the second end of the connecting rod 4. By adopting the above scheme, the bottom of the fork 21 is U-shaped 211, so that after the circuit breaker is disconnected, the mouth of the U-shaped 211 can well lock the second end of the connecting rod 4 in the curved portion 1111 of the slide groove 111, and a resisting force is generated between the contact surface 2111 and the second end of the connecting rod 4 during the closing process of the circuit breaker to prevent the second end of the connecting rod 4 from moving, so that the second end of the connecting rod 4 is locked in the curved portion 1111 when the lock buckle 2 is not subjected to external force; when the circuit breaker needs to be disconnected after closing, the lever arm 213 can also assist in shifting the second end of the connecting rod 4, which can well prevent the problem of the circuit breaker not operating after the impurities adhere to the second end of the connecting rod 4.

[0028] In the embodiment of the present invention, the pressing arm 212 and the lever arm 213 are staggered, a notch 112 is arranged above the slide slot 111 of the moving contact mounting seat 11, and the pressing arm 212 can be placed in the notch 112, a boss 113 is arranged below the slide slot 111 of the moving contact mounting seat 11, and the lever arm 213 can be placed on the outer surface of the boss 113, and a portion of the upper side surface of the boss 113 is connected to the lower side surface of the slide slot curved portion 1111 as a whole to form a pressing surface 11111. With the above scheme, the pressing arm 212 and the lever arm 213 are staggered, so that the connection and cooperation between the moving contact mounting seat 11 is more reasonable and the volume is small; a portion of the upper side surface of the boss 113 is connected to the lower side surface of the slide slot curved portion 1111 as a whole to form a pressing surface 11111, so that the pressing surface 11111 is as large as possible, so that the second end of the connecting rod 4 cooperates more stably with the pressing surface 11111.

[0029] In the embodiment of the present invention, the end of the pressing arm 212 is provided with an inclined surface 2121 for the second end of the connecting rod 4 to slide into the curved portion, the middle of the moving contact mounting seat 11 is provided with a boss 114, and arc-shaped bosses 1141 are evenly arranged around the boss 114. A circular through hole 22 is provided on the lock buckle 2, and the circular through hole 22 is sleeved on the outer periphery of the arc-shaped boss 1141 to realize the rotational cooperation between the lock buckle 2 and the moving contact mounting seat 11, and a paddle 23 and an arc-isolating sheet 24 are provided below the lock buckle 2, and an inclined push surface 25 is provided on the side of the lock buckle 2 located above the circular through hole 22, and an arc surface 26 for the push rod of the circuit breaker releaser to push is provided on the side located below the circular through hole 22; by adopting the above scheme, the inclined surface 2 The setting of 121 is to facilitate the second end of the connecting rod 4 to slide into the curved portion 1111 of the slide groove 111. Of course, the inclined surface 2121 can also be omitted, and only an arc-shaped transition angle can be set. The moving contact mounting seat 11 and the lock buckle 2 adopt the above-mentioned method to achieve rotational cooperation, which can well prevent dust or impurities from adhering to the lock buckle 2 and the moving contact mounting seat 11, affecting the normal operation of the circuit breaker. The purpose of the paddle 23 and the arc isolation piece 24 arranged below the lock buckle 2 is to provide the double metal pull rod with a working and arc-isolating function. The side of the lock buckle 2 is located above the circular through hole 22 and is provided with an inclined push surface 25, the purpose of which is to facilitate the pushing of the lock buckle push rod. The side is located below the circular through hole 22 and is provided with an arc surface 26 for the push rod of the circuit breaker releaser to push, so as to facilitate the pushing of the releaser.

Claims

1. A locking device for a circuit breaker, characterized in that: The invention comprises a moving contact mechanism, a lock, a handle and a connecting rod, wherein the moving contact mechanism comprises a moving contact mounting seat and a moving contact, the handle is mounted on the housing of the circuit breaker, the lock is rotatably arranged on the moving contact mounting seat, a slide groove is arranged on the upper end of the moving contact mounting seat, the slide groove comprises a curved portion and a straight portion, one end of the curved portion is connected with the straight portion, a pressing surface is arranged on the other end of the curved portion, a first end of the connecting rod is connected to the handle, and the second end of the connecting rod is placed in the slide groove, a pressing arm is arranged on the upper end of the lock, and after the circuit breaker is disconnected, the pressing arm cooperates with the curved portion of the slide groove to lock the second end of the connecting rod, and the position of the first end of the connecting rod on the handle is lower than the position of the second end of the connecting rod on the curved portion, at which time the connecting rod can be pushed A handle is used to close the circuit breaker. During the closing process, the second end of the connecting rod contacts the pressing surface. After the circuit breaker is closed, the second end of the connecting rod contacts the pressing surface. After closing, the angle between the thrust direction of the handle on the second end of the connecting rod and the direction of the resistance force of the pressing surface on the second end of the connecting rod is always less than 180 degrees. The combined force on the second end of the connecting rod generated by the thrust and the resistance force is upward. The resistance arm of the lock contacts the top of the connecting rod. The resistance force of the resistance arm on the second end of the connecting rod is balanced with the combined force to achieve the second end of the connecting rod being placed on the curved portion and contacting the pressing surface. When the lock is actuated, the lock rotates and the resistance arm loses its resistance to the second end of the connecting rod. At this time, the second end of the connecting rod slides into the straight portion of the slide slot to achieve the circuit breaker disconnection.

2. The locking device of the circuit breaker according to claim 1, characterized in that: A pushing arm is arranged below the pressing arm of the lock, and a fork is formed between the pressing arm and the pushing arm. The bottom of the fork is arranged in a U shape, the upper side of the fork is a contact surface, and the lower side of the fork is a pushing surface. The opening of the fork is larger than the diameter of the second end of the connecting rod. When the contact surface contacts the second end of the connecting rod, the pushing surface leaves the second end of the connecting rod. When the contact surface leaves the second end of the connecting rod, the pushing surface can push the second end of the connecting rod.

3. The locking device of the circuit breaker according to claim 2, characterized in that: The pressing arm and the pushing arm are staggered, a notch is provided above the slide groove of the moving contact mounting seat, the pressing arm can be inserted into the notch, a boss is provided below the slide groove of the moving contact mounting seat, the pushing arm can be placed on the outer surface of the boss, and a portion of the upper side surface of the boss is connected with the lower side surface of the curved portion of the slide groove to form a pressing surface.

4. The locking device of the circuit breaker according to claim 1 or 2, characterized in that: The end of the pressure arm is provided with an inclined surface for allowing the second end of the connecting rod to slide into the bent portion, a convex column is provided in the middle of the moving contact mounting seat, and arc-shaped bosses are evenly provided around the convex column, a circular through hole is provided on the lock buckle, and the circular through hole is sleeved on the outer periphery of the arc-shaped boss to realize the rotational cooperation between the lock buckle and the moving contact mounting seat, a paddle and an arc isolation sheet are provided below the lock buckle, an inclined push surface is provided on the side of the lock buckle located above the circular through hole, and an arc surface for the push rod of the circuit breaker releaser to push is provided on the side below the circular through hole.

5. The locking device of the circuit breaker according to claim 3, characterized in that: The end of the pressure arm is provided with an inclined surface for allowing the second end of the connecting rod to slide into the bent portion, a convex column is provided in the middle of the moving contact mounting seat, and arc-shaped bosses are evenly provided around the convex column, a circular through hole is provided on the lock buckle, and the circular through hole is sleeved on the outer periphery of the arc-shaped boss to realize the rotational cooperation between the lock buckle and the moving contact mounting seat, a paddle and an arc isolation sheet are provided below the lock buckle, an inclined push surface is provided on the side of the lock buckle located above the circular through hole, and an arc surface for the push rod of the circuit breaker releaser to push is provided on the side below the circular through hole.

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