Circuit breaker operating mechanism and circuit breaker

Abstract

The application discloses a circuit breaker operating mechanism which comprises an energy storage mechanism, a driving mechanism and a side plate, one end of the energy storage mechanism is fixed on the side plate, the other end of the energy storage mechanism is connected with one end of the driving mechanism, and the operating mechanism is characterized in that: a connecting rod mechanism is further included, the other end of the driving mechanism is connected with one end of the connecting rod mechanism, the other end of the connecting rod mechanism is connected with a moving contact, the connecting rod mechanism comprises a first connecting rod, a second connecting rod and a third connecting rod, one end of the first connecting rod, the second connecting rod and the third connecting rod is rotatably installed on a second shaft, the other end of the first connecting rod is rotatably installed on a first shaft of the side plate, the other end of the third connecting rod is installed on a third shaft, and the other end of the second connecting rod is connected with a rotating shaft through a shaft. In the opening process of the operating mechanism, after a trip lever releases a lever, the closing connecting rod system has an uncertain movement because the degree of freedom is greater than the number of driving forces, and the opening connecting rod system has a determined movement, so that the reliability of the movement is ensured, the deficiency of the original closing system is made up, a group of springs is added in the opening system, the two connecting rod systems work in parallel in the opening process, the system reliability is improved, and the operating speed of the mechanism is accelerated.

Description

Technical Field

[0001] This invention belongs to the field of molded case circuit breakers, specifically relating to a novel circuit breaker operating mechanism and a circuit breaker using the operating mechanism. Background Technology

[0002] Circuit breakers are an important component of electrical distribution equipment used in low-voltage power systems. The operating mechanism is a crucial structural element, driving the contacts to perform opening and closing operations via a transmission device. It can also coordinate with other protective devices to disconnect the circuit in the event of a line fault, protecting the line or electrical equipment from damage. Larger circuit breakers often employ a pre-stored energy mechanism, storing and releasing energy through internal springs to cause the moving and stationary contacts to engage or disengage, completing the opening and closing operations.

[0003] During the opening or closing process of a circuit breaker, the moving parts such as contacts have a certain degree of inertia. After reaching their limit positions and contacting the limit devices, they are prone to springing back. During high-current tripping, the springback of the moving contacts will reduce the electrical clearance, which is not conducive to the rapid extinguishing of the arc and reduces product performance. Therefore, in addition to meeting normal operating characteristics, the springback problem of the contacts must also be addressed in the mechanism design. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the present invention aims to propose a circuit breaker operating mechanism that can be operated using an energy storage structure, enabling it to lock the contact portion in both closing and opening states to prevent abnormal contact movement, and providing a fast overall operating speed and high breaking capacity.

[0005] To achieve the above objectives, the present invention proposes a circuit breaker operating mechanism comprising an energy storage mechanism, a drive mechanism, and a side plate. One end of the energy storage mechanism is fixed to the side plate, and the other end of the energy storage mechanism is connected to one end of the drive mechanism. The mechanism is characterized by further including a linkage mechanism. The other end of the drive mechanism is connected to one end of the linkage mechanism, and the other end of the linkage mechanism is connected to a moving contact. The linkage mechanism includes a first link, a second link, and a third link. One end of the first link, the second link, and the third link is rotatably mounted on a second shaft. The other end of the first link is rotatably mounted on a first shaft of the side plate. The other end of the third link is mounted on a third shaft. The other end of the second link is connected to a rotating shaft via a shaft.

[0006] The circuit breaker operating mechanism described above also includes a second spring symmetrically installed at both ends of the second shaft. One end of the second spring is fitted into the grooves at both ends of the second shaft, and the other end of the second spring is connected to the side plate or the connecting post on the side plate.

[0007] In the circuit breaker operating mechanism described above, the first link, the second link, and the third link are all cold-stamped from a single metal plate, and a round hole is provided at both ends of the first link, the second link, and the third link.

[0008] In the aforementioned circuit breaker operating mechanism, the driving mechanism includes a driving rod, a first lever, an upper connecting rod, a lower connecting rod, a cantilever, a tripping rod, and a double-blade lever. The driving rod is rotatably mounted on the side plate via a first rotating shaft. One end of the driving rod is connected to the energy storage mechanism via a first shaft, and the other end of the driving rod engages with the upper connecting rod to drive the upper connecting rod to move. The first lever is rotatably mounted on the side plate, and the tail of the first lever is pinned to the upper connecting rod. The end of the first lever engages with one end of the double-blade lever, and the other end of the double-blade lever engages with the tripping rod. One end of the upper connecting rod is pinned to the first lever and can rotate around its axis. The other end of the upper connecting rod is pinned to one end of the lower connecting rod, and the other end of the lower connecting rod is pinned to the cantilever on the second rotating shaft. The second rotating shaft is rotatably mounted on the side plate.

[0009] In the circuit breaker operating mechanism described above, the driving mechanism further includes a first spring symmetrically installed at both ends of the second shaft, with the other end of the first spring hooked onto the shaft installed above it.

[0010] In the circuit breaker operating mechanism described above, both the first spring and the second spring are tension springs.

[0011] Another object of the present invention is to provide a circuit breaker including the circuit breaker operating mechanism described above.

[0012] Compared with the prior art, the circuit breaker operating mechanism of the present invention has the following technical advantages:

[0013] 1) In the closing linkage system of the operating mechanism of the present invention, the upper and lower linkages pass through the dead point at a certain angle, and form a stable state after closing. When the contacts exert a large reaction force on the rotating shaft after closing, the mechanism cannot be opened.

[0014] 2) In the tripping linkage system, the main shaft cantilever and linkage form a stable system in the tripping state. The cantilever and linkage pass through the dead point at a certain angle and are locked when the contact system is opened to prevent the contact system from falling back.

[0015] 3) During the tripping process, after the tripping lever releases the lever, the closing linkage system has uncertain motion because its degrees of freedom are greater than the number of driving forces, while the tripping linkage system has definite motion, ensuring the reliability of the motion and making up for the shortcomings of the original closing system.

[0016] 4) Adding a set of springs to the tripping system allows the two sets of linkage systems to work in parallel during the tripping process, improving system reliability and accelerating the mechanism's action speed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the operating mechanism in the open state in a specific embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the operating mechanism in the closed state in a specific embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the operating mechanism in the opening process in a specific embodiment of the present invention;

[0020] Figure 4 This is a three-dimensional structural diagram of the operating mechanism in a specific embodiment of the present invention;

[0021] Serial Number:

[0022] 1-Base, 2-Cover, 3-Shaft, 4-Moving contact, 5-Shaft, 51-First shaft, 52-Second shaft, 53-Third shaft, 54-Fourth shaft, 55-Fifth shaft, 56-Sixth shaft, 6-Operating mechanism, 601-Spring assembly, 602-Drive rod, 603-First lever, 604-Upper connecting rod, 605-Lower connecting rod, 606-First spring, 607-Double-blade lever, 608-Releasing rod, 609-Second shaft, 610-Cantilever, 611-First connecting rod, 612-Second connecting rod, 613-Third connecting rod, 614-First shaft, 615-Second spring, 616-Side plate, 7-Stationary contact. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, in a specific embodiment of the present invention, the circuit breaker includes a base 1, a cover 2, a rotating shaft 3, a moving contact 4, a stationary contact 7, and an operating mechanism 6. The cover 2 is mounted on the base 1, and the operating mechanism 6 is mounted on the cover 2. A first rotating shaft 3 is installed within the space formed by the base 1 and the cover 2, and the first rotating shaft 3 is rotatable about its axis. The moving contact 4 is mounted on the first rotating shaft 3, and the stationary contact 7 is mounted on the base 1. The operating mechanism 66 drives the first rotating shaft 3 to rotate, thereby causing the moving contact 4 to rotate and separate or contact the stationary contact 7, thus realizing the opening / closing operation of the circuit breaker.

[0025] In a specific embodiment of the present invention, the operating mechanism 6 includes an energy storage mechanism, a drive mechanism, a linkage mechanism, and a side plate. One end of the energy storage mechanism 601 is fixed to the side plate 616, and the other end of the energy storage mechanism 601 is connected to one end of the drive mechanism. The other end of the drive mechanism is connected to one end of the linkage mechanism, and the other end of the linkage mechanism is connected to a moving contact. One end of the energy storage mechanism 601 is fixed to the side plate 616, and the other end of the energy storage mechanism 601 is connected to one end of the drive rod 602 via a first shaft 51, enabling energy storage and release operations. It can drive the upper linkage 604 to rotate. In this invention, the energy storage mechanism is a spring assembly.

[0026] The driving mechanism in a specific embodiment of the present invention includes a driving rod 602, a first lever 603, an upper connecting rod 604, a lower connecting rod 605, a cantilever 610, a tripping lever 608, and a double-blade lever 607. The driving rod 602 is rotatably mounted on the side plate 616 via a first rotating shaft 614. One end of the driving rod 602 is connected to the energy storage mechanism 601 via a first shaft 51, and the other end of the driving rod 602 engages with the upper connecting rod 604, driving the upper connecting rod 604 to move. The first lever 603 is rotatably mounted on the side plate 616. The tail of the first lever 603 is pinned to the upper connecting rod 604, and the end of the first lever 603 engages with one end of the double-blade lever 607. The double-blade lever 607 is rotatably mounted on the side plate 616, and the other end of the double-blade lever 607 engages with the tripping lever 608. One end of the upper connecting rod 604 is pinned to the first lever 603, and the other end of the upper connecting rod 604 is pinned to one end of the lower connecting rod 605. The other end of the lower connecting rod 605 is pinned to one end of the cantilever 610 on the second rotating shaft 609, and the other end of the cantilever 610 is simultaneously connected to the third connecting rod 613. The second rotating shaft 609 is rotatably mounted on the side plate 616. A first spring 606 is installed on each end of the fourth shaft 54, and the other end of the first spring 606 is hooked onto the shaft mounted on the side plate 616, directly driving the second rotating shaft 609 to rotate during circuit breaking.

[0027] The linkage mechanism of this invention includes two sets of first linkages 611, second linkages 612, and third linkages 613. One end of the first linkage 611 is rotatably mounted on the sixth shaft 56. The other end of the first linkage 611, along with one end of the second linkage 612 and one end of the third linkage 613, is rotatably or movablely mounted on the second shaft 52. The third linkage 613 is located closer to the side plate, and the second linkage 612 is located between the first linkage 611 and the third linkage 613. The other end of the third linkage 613 is rotatably mounted on the third shaft 53, and the other end of the second linkage 612 is mounted on the fifth shaft 55, which can drive the rotating shaft 3 to move. A second spring 615 is installed at each end of the second shaft 52. The other end of the second spring 615 is mounted on the side plate 616 or on the connecting post of the side plate 616. During the opening process, the second spring 615 can directly drive the third linkage 613 to move.

[0028] The closing process of the operating mechanism of the present invention is as follows: After the energy storage mechanism 601 stores energy, it is in a compressed state. The trip lever 608 locks the double-blade lever 607, which in turn locks the first lever 603. The moving contact 4 and the stationary contact 7 are in an open state. The energy storage mechanism 601 pushes the drive rod 602 to rotate. After the drive rod 602 contacts the upper connecting rod 604, it drives the upper connecting rod 604 to move. The lower connecting rod 605 drives the second rotating shaft 609 to rotate. The second rotating shaft 609 drives the third connecting rod 613 and the first connecting rod 611 through the cantilever 610. The second connecting rod 612 moves and drives the rotating shaft 3 to move. When the moving contact 4 contacts the stationary contact 7, the moving contact 7 rotates relative to the rotating shaft 3, generating final pressure. The upper connecting rod 604 and the lower connecting rod 605 in the closing linkage system move to the dead position. At this time, the first rotating shaft 3 reaches its maximum rotation angle. After passing the dead point at a certain angle, the movement stops, at which point the rotating shaft 3 and the moving contact 4 move to the closing position. Because the upper connecting rod 604 and the lower connecting rod 605 have passed the dead point, the contact reaction force cannot open the operating mechanism 6, and the mechanism remains in a stable state, thus completing the closing process.

[0029] The tripping process of the operating mechanism of this invention is as follows: the trip lever 608 releases the double-blade lever 607. After the double-blade lever 607 rotates a certain angle, it releases the first lever 603. Under the action of the first spring 606, the lower connecting rod 605 drives the upper connecting rod 604 and the first lever 603 to rotate along the rotation axis. At this time, the angle between the upper connecting rod 604 and the lower connecting rod 605 changes. After passing the dead point, the upper connecting rod 604 and the lower connecting rod 605 are released from the locked state. At this time, the degree of freedom of the closing linkage system is greater than the driving force. The lower connecting rod 605 drives the second rotating shaft 609 to rotate. When the first lever 603 is released and the rotating shaft 3 starts to rotate, the tripping linkage system starts to move synchronously. Since the tripping linkage system always has a definite motion, it moves under the drive of the second spring 615. The two sets of linkage systems cooperate with each other, and under the action of the second connecting rod 612, they drive the rotating shaft 3 to move and trip. After the third link 613 and the cantilever 610 are collinear, the rotating shaft 3 reaches the maximum opening angle. During the continued movement, the third link 613 and the cantilever 610 pass the dead point at a certain angle. After reaching the limit surface, the movement of the cantilever 610 and the third link 613 terminates. At this time, the rotating shaft 3 falls back to the maximum open position. The opening linkage system locks the rotating shaft 3. Except for the closing operation, the rotating shaft 3 cannot rotate in the closing direction. After the energy storage mechanism 601 stores energy, the trip lever 608, the first lever 603, and the double-blade lever 607 are reset, and the system returns to the initial state, completing one working cycle.

[0030] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, those skilled in the art will recognize that there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A circuit breaker operating mechanism, comprising an energy storage mechanism, a drive mechanism, and a side plate, wherein one end of the energy storage mechanism is fixed to the side plate, and the other end of the energy storage mechanism is connected to one end of the drive mechanism, characterized in that: It also includes a linkage mechanism, with the other end of the drive mechanism connected to one end of the linkage mechanism, and the other end of the linkage mechanism connected to the moving contact. The linkage mechanism includes a first link, a second link, and a third link. One end of the first link, the second link, and the third link is rotatably mounted on a second shaft. The other end of the first link is rotatably mounted on a sixth shaft of the side plate. The other end of the third link is mounted on a third shaft. The other end of the second link is connected to a rotating shaft via a fifth shaft. It also includes second springs symmetrically installed at both ends of the second shaft, one end of the second spring being fitted into the grooves at both ends of the second shaft, and the other end of the second spring being connected to the side plate or the connecting post on the side plate; The driving mechanism includes a driving rod, a first lever, an upper connecting rod, a lower connecting rod, a cantilever, a tripping lever, and a double-blade lever. The driving rod is rotatably mounted on the side plate via a first rotating shaft. One end of the driving rod is connected to the energy storage mechanism via a first shaft, and the other end of the driving rod engages with the upper connecting rod to drive the upper connecting rod to move. The first lever is rotatably mounted on the side plate. The tail of the first lever is pinned to the upper connecting rod, and the end of the first lever engages with one end of the double-blade lever. The other end of the double-blade lever engages with the tripping lever. One end of the upper connecting rod is pinned to the first lever and can rotate around an axis. The other end of the upper connecting rod is pinned to one end of the lower connecting rod, and the other end of the lower connecting rod is pinned to the cantilever on the second rotating shaft. The second rotating shaft is rotatably mounted on the side plate. The drive mechanism also includes a first spring symmetrically mounted at both ends of the fourth shaft, with the other end of the first spring attached to the shaft mounted above it.

2. The circuit breaker operating mechanism as described in claim 1, characterized in that, The first, second, and third connecting rods are all cold-stamped from a single metal sheet, and each of the first, second, and third connecting rods has a round hole at both ends.

3. The circuit breaker operating mechanism as described in claim 1, characterized in that, The second spring is a tension spring.

4. The circuit breaker operating mechanism as described in claim 1, characterized in that, The first spring is a tension spring.

5. A circuit breaker, characterized in that, Includes the circuit breaker operating mechanism as described in any one of claims 1 to 4.

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