Circuit breaker electromagnetic operating mechanism

Abstract

The present invention discloses an electromagnetic operating mechanism for a circuit breaker. It includes a static contact, a moving contact that cooperates with the static contact, and an electromagnetic mechanism that can operate the moving contact. The electromagnetic mechanism is hinged with a swing arm through a transition connector. The end of the swing arm is hinged with the moving contact so that it can drive the moving contact to open and close. The front side of the electromagnetic mechanism is provided with a hook for cooperating with the transition connector. The hook can be driven by an elastic driving member, thereby cooperating with the transition connector to achieve closing lock or opening disengagement. After adopting the above structure, the entire operating mechanism not only maintains the characteristics of the original spring mechanism of no power consumption and no voltage short-circuit protection in the closed state, but also has the high reliability of the electromagnetic mechanism, overcomes all the shortcomings of the two mechanisms, and has the best characteristics of both, can increase the electrical life and mechanical life by several times, and fully meets the technical standard requirements of the State Grid for high-reliability switches.

Description

Technical Field

[0001] The present invention relates to a switch mechanism for opening and closing in electrical equipment, in particular to an electromagnetic operating mechanism for a circuit breaker. Background Art

[0002] At present, all molded case reclosing switches in China are based on traditional spring mechanism molded case switches, with an additional electric operation or motor drive mechanism for reclosing or opening. The spring mechanism is a multi-link mechanism with a complex structure, many faults, slow opening and closing speed, poor reliability, and a short life. It is difficult to meet the reliability requirements of the State Grid Corporation of China (the State Grid requires its mechanical life to be 5000-8000 times, and currently almost no manufacturer can meet this requirement), and the action discreteness is tens of milliseconds.

[0003] In addition, the highly reliable control and protection switch with electromagnetic closing mechanism needs to rely on electromagnetic attraction to maintain operation for a long time, has high energy consumption, and does not have a no-voltage short-circuit tripping protection mechanism, making it difficult to meet the relevant standards in GB14048.2. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an electromagnetic operating mechanism for a circuit breaker with an ingenious structural design, capable of performing opening and closing operations quickly and reliably, and capable of self-locking when powered off in the closed state and having a tripping protection function.

[0005] In order to solve the above technical problems, the electromagnetic operating mechanism of the circuit breaker of the present invention includes a static contact, a moving contact cooperating with the static contact, and an electromagnetic mechanism capable of operating the moving contact. The electromagnetic mechanism is hinged with a swing arm through a transition connector, and the end of the swing arm is hinged with the moving contact so as to drive the moving contact to open and close. A hook for cooperating with the transition connector is provided on the front side of the electromagnetic mechanism. The hook can be driven by an elastic driving member, thereby cooperating with the transition connector to achieve closing lock or opening disengagement.

[0006] The elastic driving member includes an L-shaped rocking rod synchronously connected to the hook through a rotating shaft and a tension spring located behind the lower side of the L-shaped rocking rod. The tension spring is connected to the L-shaped rocking rod and can drive the L-shaped rocking rod to move.

[0007] An electromagnetic attraction mechanism is provided on the side of the electromagnetic mechanism, the upper end of the L-shaped rocker is connected to the electromagnetic attraction mechanism, and the lower end of the L-shaped rocker is connected to the tension spring. The action of the electromagnetic attraction mechanism can make the L-shaped rocker and the hook move synchronously, thereby disengaging the hook from the slot.

[0008] An induction device is provided beside the moving contact, and the induction device has an operating rod that can be driven by an induced current. A pull rod is connected between the operating rod and the lower end of the L-shaped rocker.

[0009] The electromagnetic mechanism includes an electromagnetic coil and an iron core matched with the electromagnetic coil. The iron core is hinged to the transition connector through a driving block.

[0010] A clamping slot is provided on the transition connector. The clamping hook is located above the driving block and can enter the clamping slot from the top surface of the driving block to limit the driving block.

[0011] After adopting the above structure, since the electromagnetic mechanism is hinged with the moving contact driven by the swing arm through a transition connector, and in particular, the hook driven by the elastic drive member is cleverly designed, during the opening and closing process, the electromagnetic closing and mechanical locking mechanisms are combined to achieve reliable locking of the closing and disengagement of the opening through the cooperation between the hook and the transition connector. Its structural design is simple and reasonable, which reduces the occurrence of failure rates, and the opening and closing speeds are very fast, and the reliability is greatly improved, thereby extending the service life. In addition, through the clever design of the tripping structure, the tripping is convenient and reliable and the energy consumption is reduced, so that the entire operating mechanism maintains the characteristics of zero power consumption and no voltage short-circuit protection in the closing state of the original spring mechanism, and has the high reliability of the electromagnetic mechanism, overcoming all the shortcomings of the two mechanisms and having the best characteristics of both, which can increase the electrical life and mechanical life by several times, and fully meet the technical standards of the State Grid for high-reliability switches. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the three-dimensional structure of the electromagnetic operating mechanism of the circuit breaker of the present invention;

[0013] Figure 2 Schematic diagram of the structure of the electromagnetic operating mechanism of the circuit breaker in the open state of the present invention;

[0014] Figure 3 Schematic diagram of the tripping state structure of the electromagnetic operating mechanism of the circuit breaker of the present invention;

[0015] Figure 4 It is a schematic structural diagram of the closed state of the electromagnetic operating mechanism of the circuit breaker of the present invention. DETAILED DESCRIPTION

[0016] The electromagnetic operating mechanism of the circuit breaker of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] As shown in the figure, the electromagnetic operating mechanism of the circuit breaker of the present invention includes a static contact 1, a moving contact 2 cooperating with the static contact, and an electromagnetic mechanism 3 capable of operating the moving contact. The electromagnetic mechanism 3 includes an electromagnetic coil and an iron core cooperating with the electromagnetic coil. The front end of the iron core has a driving block. The iron core is hinged to a transition connector 4 through the driving block 11. The transition connector 4 is hinged with a swing arm 5. That is, the transition connector 4 is hinged between the driving block 11 and the swing arm 5. The end of the swing arm 5 is hinged to the moving contact 2 so as to drive the moving contact to open and close. As can be seen from the figure, the static contact is fixedly installed below the electromagnetic mechanism. The iron core of the electromagnetic mechanism 3 is connected to the driving block 11. The driving block 11 moves, which in turn drives the swing arm 5 to move through the transition connector 4. The swing of the swing arm 5 causes the moving contact 2 and the static contact to perform opening and closing operations. Through this structural design, the horizontal movement of the iron core is changed into the up and down swinging of the moving contact through the transition connection between the transition connector and the swing arm. A hook 6 for cooperating with the transition connector is provided on the front side of the electromagnetic mechanism 3. A slot is provided on the transition connector 3. The hook 6 is located above the driving block and can enter the slot from the top surface of the driving block to limit the driving block. The hook 6 can be driven by the elastic driving member, thereby cooperating with the transition connector to achieve closing locking or opening disengagement.

[0018] Furthermore, the elastic driving member includes an L-shaped rocker 8 synchronously connected to the hook through the rotating shaft 7 and a tension spring 9 located at the rear of the lower side of the L-shaped rocker. The L-shaped rocker 8 has a matching micro switch. The tension spring 9 is fixedly installed under the electromagnetic mechanism. The tension spring 9 is connected to the L-shaped rocker and can drive the L-shaped rocker to move. As can be seen from the figure, the rotating shaft 7 is installed through the mounting seat installed on the front upper part of the electromagnetic mechanism (located above the driving block). After installation, the rotating shaft is located on the front upper side of the electromagnetic mechanism and can rotate under the support of the mounting seat. The hook and the L-shaped rocker 8 are simultaneously It is fixedly mounted on the rotating shaft and can rotate synchronously driven by the rotating shaft, so that the hook 6 is located above the driving block and can enter the card slot from the top surface of the driving block to limit the driving block. An electromagnetic attraction mechanism 10 is provided on the side of the electromagnetic mechanism 3. The upper end of the L-shaped rocker arm 8 is connected to the electromagnetic attraction mechanism and cooperates with the micro switch. The lower end of the L-shaped rocker arm 8 is connected to the tension spring 9. The auxiliary coil of the electromagnetic attraction mechanism is energized, and the actuator of the electromagnetic attraction mechanism is activated, so that the L-shaped rocker arm 8 and the hook 6 can move synchronously, thereby disengaging the hook 6 from the card slot.

[0019] Furthermore, the rear end of the moving contact 2 is provided with an electromagnetic short-circuit sensing device (short-circuit protection ring) 12. The sensing device 12 can sense short-circuit current. The sensing device 12 is arranged side by side on the front side of the moving contact (away from the static contact). The sensing device 12 has an operating rod 13 that can be driven by the short-circuit induced current. A pull rod 14 is connected between the operating rod 13 and the lower end of the L-shaped rocker 8. When a short circuit occurs, the operating rod 13 of the sensing device 12 drives the pull rod to move, and the pull rod action causes the L-shaped rocker 8 to swing, so that the hook does not fall out of the slot, thereby realizing the short-circuit tripping action.

[0020] Here's how it works:

[0021] Closing action Figure 4 As shown, the coil of the electromagnetic mechanism is energized, and its iron core drives the driving block to move. The iron core of the electromagnetic mechanism 3 moves backward through the driving block 11, and then drives the swing arm 5 to swing through the transition connector 4. The swing of the swing arm 5 makes the moving contact 2 and the static contact contact, thereby realizing the closing action. At this time, due to the backward movement of the driving block, the hook can contact the transition connector and enter the slot. The hook is limited in the slot by the elastic force of the tension spring, thereby realizing the closing lock. After the closing lock, the L-shaped rocker 8 presses the micro switch, and the normally closed contact of the micro switch is disconnected, so that the coil of the electromagnetic mechanism is de-energized and the closing state is maintained. Since the hook is connected to the slot, the reliability of the closing lock is very high.

[0022] The opening action is as follows Figure 2 As shown, the auxiliary coil of the electromagnetic attraction mechanism is energized, and the actuator of the electromagnetic attraction mechanism is activated, so that the L-shaped rocker 8 and the hook 6 move synchronously, thereby disengaging the hook 6 from the slot. At the same time, the iron core of the electromagnetic mechanism 3 moves forward through the driving block 11 under the action of the spring, and then drives the swing arm 5 to swing through the transition connector 4. The swing of the swing arm 5 separates the moving contact 2 and the static contact, thereby realizing the opening action. In this process, due to the forward movement of the driving block, the hook cannot contact the transition connector. The elastic force of the hook under the tension spring presses on the top surface of the driving block, thereby realizing the opening and disengaging of the switch. The normally closed point of the micro switch is connected, thereby connecting the electromagnetic coil 3 and entering the initial separation state.

[0023] Tripping action by Figure 3 It can be seen that when a short circuit occurs, the operating rod 13 of the sensing device 12 drives the pull rod to move, and the pull rod action causes the L-shaped rocker 8 to swing, so that the hook does not fall out of the slot, realizing the short circuit tripping action.

Claims

1. A circuit breaker electromagnetic operating mechanism, characterized in that: The invention comprises a static contact (1), a moving contact (2) matched with the static contact, and an electromagnetic mechanism (3) capable of operating the moving contact, wherein the electromagnetic mechanism (3) is hingedly connected to a swing arm (5) via a transition connector (4), and the end of the swing arm (5) is hingedly connected to the moving contact (2) so as to drive the moving contact to open and close. The front side of the electromagnetic mechanism (3) is provided with a hook (6) for matching with the transition connector, and the hook (6) can be driven by an elastic driving member, thereby matching with the transition connector to achieve closing locking or opening disengagement; The elastic driving member comprises an L-shaped swing rod (8) synchronously connected to the hook via a rotating shaft (7) and a tension spring (9) located at the rear of the lower side of the L-shaped swing rod, wherein the tension spring (9) is connected to the L-shaped swing rod and can drive the L-shaped swing rod to move; The electromagnetic mechanism (3) is provided with an electromagnetic attraction mechanism (10) on the side, the upper end of the L-shaped rocker (8) is connected to the electromagnetic attraction mechanism, and the lower end of the L-shaped rocker (8) is connected to the tension spring (9), and the action of the electromagnetic attraction mechanism can make the L-shaped rocker (8) and the hook (6) move synchronously, so that the hook (6) is disengaged from the slot; the side of the moving contact (2) is provided with an induction device (12), the induction device (12) has an operating rod (13) that can be driven by an induced current, and a pull rod (14) is connected between the operating rod (13) and the lower end of the L-shaped rocker (8); the electromagnetic mechanism (3) includes an electromagnetic coil and an iron core matched with the electromagnetic coil, and the iron core is hinged to the transition connector (4) through a driving block (11); a slot is provided on the transition connector (3), and the hook (6) is located above the driving block and can enter the slot from the top surface of the driving block to limit the driving block.

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