A quick tripping device and circuit breaker

Abstract

The present invention proposes a quick release device comprising a mechanism and a rotating shaft, both of which are mounted on a base. A moving contact is mounted on the rotating shaft, and a spring member is mounted on the moving contact. The mechanism comprises a traction rod, a trip rod, and a side plate. The traction rod and the trip rod are both rotatably mounted on the side plate, and a drive rod is movably mounted on the side plate. One end of the drive rod contacts and cooperates with the trip rod, and the other end of the drive rod contacts and cooperates with the traction rod. The quick release device of the present invention acts directly on the trip rod via the drive rod, resulting in a short transmission path, a simple and reliable structure, a shortened total disconnection time, and automatic reset, enabling multiple disconnections.

Description

Technical Field

[0001] The invention belongs to the technical field of low-voltage circuit breakers, and particularly relates to a device capable of realizing bouncing linkage tripping of a moving contact. Background Art

[0002] The overcurrent protection functions of low-voltage circuit breakers mainly include short-circuit protection and overload protection. Short-circuit protection usually uses a tripping electromagnet device, which is divided into solenoid type and snap-on type. Large-capacity circuit breakers use a snap-on electromagnet structure. For small-capacity circuit breakers, snap-on electromagnets are usually used as backup protection devices to perform short-circuit protection when disconnecting larger short-circuit currents. The electromagnetic tripping device cooperates with the mechanism release structure to drive the mechanism to trip in the event of a short circuit.

[0003] Traditional moving contact systems and tripping mechanisms are structurally independent. This results in a long operating time for the electromagnetic tripping mechanism during high-current interruption tests. As the moving contact bounces open due to the increased short-circuit current, the tripping mechanism cannot release the mechanism in time, causing adhesion or severe burns after the contact returns, limiting the interrupting capacity. Therefore, a tripping mechanism is needed that can be structurally linked to the moving contact, driving the mechanism to operate during the moving contact's bounce due to electrodynamic repulsion, thus preventing a secondary drop after the contact opens. Summary of the Invention

[0004] In response to the problems existing in the prior art, the purpose of the present invention is to propose a quick tripping device that realizes the linkage between the moving contact and the mechanism tripping rod through an intermediate transmission structure, and acts on the mechanism tripping rod to quickly trip after the moving contact bounces a certain angle.

[0005] To achieve the above-mentioned purpose, the present invention provides a quick release device including a mechanism and a rotating shaft, wherein the mechanism and the rotating shaft are both installed on a base, and a moving contact is installed on the rotating shaft. The device is characterized in that: a spring member is installed on the moving contact, and the mechanism includes a traction rod, a trip rod and a side plate. The traction rod and the trip rod are both rotatably installed on the side plate, and a driving rod is movably installed on the side plate, one end of the driving rod is in contact with the trip rod, and the other end of the driving rod is in contact with the traction rod.

[0006] In the above-mentioned quick release device, the drive rod is a plate-shaped integrated structure, and the drive rod includes a first vertical portion, a first horizontal portion, a second vertical portion and a second horizontal portion. A contact portion is provided at the upper end of the first vertical portion, and the contact portion contacts and cooperates with the release rod. The first vertical portion is connected to the second vertical portion through the first horizontal portion, the lower end of the second vertical portion is connected to the second horizontal portion, and one end of the second horizontal portion contacts and cooperates with the traction rod.

[0007] In the above-mentioned quick release device, a locking hook is provided in the middle of the first vertical portion, and the locking hook contacts and cooperates with a lock mounted on the mechanism.

[0008] In the above-mentioned quick release device, a first guide groove is provided on the first horizontal portion, and the first guide groove is used to accommodate a guide column provided on the mechanism.

[0009] In the above-mentioned quick release device, a second guide groove is further provided on the first vertical portion, and a third guide groove is provided on the second vertical portion. The second guide groove and the third guide groove are used to accommodate guide posts provided at corresponding positions on the mechanism.

[0010] In the above-mentioned quick release device, the first guide groove, the second guide groove and the third guide groove are oblong hole structures with the same size and the same direction.

[0011] The above-mentioned quick release device also includes a locking device, which includes a lock buckle and a first return spring. The lock buckle is rotatably mounted on the side panel, one end of the lock buckle cooperates with one end of the driving rod, and the other end of the lock buckle contacts and cooperates with the main shaft of the mechanism. A return spring is installed on the lock buckle, and the two ends of the first return spring act on the lock buckle and the driving rod respectively.

[0012] In the above-mentioned quick release device, a stopper and at least one cantilever are provided on the traction rod, the stopper is in contact with and cooperates with the other end of the driving rod, and the cantilever is in contact with and cooperates with the spring member.

[0013] In the above-mentioned quick trip device, the number of the cantilevers is consistent with the number of poles of the circuit breaker.

[0014] Another object of the present invention is to provide a circuit breaker including the above-mentioned quick trip device.

[0015] Compared with the prior art, the quick release device of the present invention has the following technical effects:

[0016] 1. The quick trip device of the present invention advances the action time of the mechanism, releasing the mechanism before the moving contact opens and falls back after repulsion, ahead of the controller action, shortening the total disconnection time;

[0017] 2. The quick release device of the present invention is directly mounted on the mechanism and directly drives the tripping rod through the traction rod, which has a short transmission path and a simple and reliable structure;

[0018] 3. After the quick trip device of the present invention performs the tripping action, the traction rod and the driving rod are automatically reset by the reset spring after the moving contact falls back or the switch is opened, meeting the requirements of multiple disconnections. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a quick trip device in a closed state in a specific embodiment of the present invention;

[0020] Figure 2 for Figure 1 A partial enlarged view of part A in the middle;

[0021] Figure 3 It is a structural schematic diagram of a quick trip device in a specific embodiment of the present invention during a bounce tripping process;

[0022] Figure 4 Schematic diagram of the reset process of the quick trip device in a specific embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the structure of a driving rod in a quick release device in a specific embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the structure of a bounce tripping transmission system in a quick tripping device in a specific embodiment of the present invention;

[0025] Figure 7 for Figure 5 A partial enlarged view of part A in the middle;

[0026] Figure 8 for Figure 6 A partial enlarged view of part B in the middle;

[0027] Figure 9 for Figure 7 A partial enlarged view of the middle C part;

[0028] Serial number:

[0029] 1-base, 2-cover, 3-rotating shaft, 4-static contact, 41-static contact, 5-moving contact, 51-driving groove, 52-moving contact, 6-mechanism, 61-main shaft, 62-driving surface, 63-limiting groove, 64-tripping rod, 65-guide column, 66-side plate, 7-traction rod, 71-stop, 72-cantilever, 721-hook, 8-driving rod, 81-first vertical part, 82-locking hook, 83-first horizontal part, 84-second vertical part, 85-second horizontal part, 811-second guide groove, 812-contact part, 821-first guide groove, 841-third guide groove, 851-stop, 9-spring member, 91-push rod, 92-boss, 10-lock, 101-groove, 11-first return spring, 12-second return spring. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] like Figure 1-3 As shown, a quick-release device in a specific embodiment of the present invention includes a rotating shaft 3, a mechanism 6, a base 1, and a cover 2. Both the rotating shaft 3 and the mechanism 6 are mounted on the base 1 and the cover 2. A moving contact 5 is mounted on the rotating shaft 3, and a stationary contact 4 is fixedly mounted on the base 1. A moving contact 52 is provided on the moving contact 5, and a stationary contact 41 is provided on the stationary contact 4. The quick-release device drives the moving contact 52 to separate from / contact the stationary contact 41, thereby opening and closing the circuit breaker. The quick-release device of the present invention accelerates the mechanism's actuation time, releasing the mechanism after the moving contact opens and falls back, prior to the controller's actuation, shortening the total disconnection time.

[0032] In a specific embodiment of the present invention, the moving contact 5 and the bouncing member 9 can both rotate around their fixed axes. The moving contact 5 is provided with a driving groove 51 at a position away from the moving contact point 51. The bouncing member 9 includes a push rod 91 and a boss 92. The moving contact 5 cooperates with the push rod 91 on the bouncing member 9 through the driving groove 51, and drives the bouncing member 9 to rotate when the moving contact 5 is repelled.

[0033] The mechanism 6 is provided with a traction rod 7, which can rotate along the axis. The traction rod 7 is provided with at least one cantilever 72, one end of which is connected to the traction rod 7, and the other end of the cantilever 72 is a hook 721. The cantilever 72 contacts and cooperates with the boss 92 of the spring member 9 through the hook 721. The spring member 9 can drive the cantilever 72 to rotate the traction rod 7. The number of cantilever 72 arranged on the traction rod 7 is consistent with the number of poles of the circuit breaker. A stopper 71 is arranged on one side of the traction rod 7, and a corresponding limiting groove 63 on the mechanism 6 is used to accommodate the stopper 71 to limit the movable area of ​​the traction rod 7. A second return spring 12 is installed on the traction rod 7 to ensure that the traction rod 7 is in an initial position. The quick release device of the present invention is directly installed on the mechanism. The traction rod is directly driven by the traction rod, which has a short transmission path and a simple and reliable structure.

[0034] A trip lever 64 is provided on the mechanism 6, which is used to release the mechanism 6 and achieve the tripping action. A main shaft 61 is provided on the mechanism 6, which is rotatable about its axis. A driving surface 62 is provided on one side of the mechanism 6. The driving surface 62 can be a flat surface or a curved surface. When the switch is closed, it disengages from the lock 10. When the switch is open, it drives the lock 10 to release the driving lever 8.

[0035] A lock catch 10 is mounted on the side plate 66 of the mechanism 6. The lock catch 10 is rotatable about its axis, with one end engaging the drive rod 8 and the other end engaging the drive surface 62. A first return spring 11 is mounted on the lock catch 10, driving the lock catch 10 into contact with the drive rod 8 and completing the reset action. After the quick-release mechanism of the present invention performs a tripping action, the first return spring 11 automatically resets the pull rod 7 and drive rod 8 after the moving contact 5 falls back or opens, meeting the requirements of multiple tripping.

[0036] A drive rod 8 is mounted on the side plate 66 of the mechanism 6. The drive rod 8 is movably mounted on the mechanism 6 and can slide within a certain range. One end of the drive rod 8 engages with the trip rod 64 on the mechanism 6, and the other end of the drive rod 8 engages with the stopper 71 on the traction rod 7. The engaged portion can move within the limit groove 63 of the mechanism 6.

[0037] like Figure 4-9 As shown, the drive rod 8 is a plate-shaped, integrated structure comprising a first vertical portion 81, a first horizontal portion 82, a second vertical portion 83, and a second horizontal portion 84. A contact portion 812 is provided at the upper end of the first vertical portion 81, which contacts and cooperates with the tripping rod 64. The first vertical portion 81 is connected to the second vertical portion 84 via the first horizontal portion 83. The lower end of the second vertical portion 84 is connected to the second horizontal portion 85, one end of which contacts and cooperates with the traction rod 7. A locking hook 82 is provided in the middle of the first vertical portion 81, which contacts and cooperates with the lock catch 10 mounted on the mechanism 6. A first guide slot 821 is provided on the first horizontal portion 83, which is used to accommodate the guide post 65 provided on the mechanism 6. The present invention may also include a second guide groove 811 on the first vertical portion 81 and a third guide groove 841 on the second vertical portion 84. The second guide groove 811 and the third guide groove 841 are configured to accommodate guide posts disposed at corresponding positions on the mechanism 6. The first guide groove 821, the second guide groove 811, and the third guide groove 841 in the present invention are oblong hole structures of equal size and consistent orientation.

[0038] The tripping process of the quick trip device in a specific embodiment of the present invention is as follows: in the initial state of the moving contact 5, the moving contact 52 is in contact with the static contact 41, a certain safety gap exists between the spring member 9 and the cantilever 72 on the traction rod 7, and the traction rod 7 is in the initial state. When the moving contact 5 is repelled by the electric repulsive force generated by the large current, it loses contact with the static contact 4 and rotates in a direction away from the static contact 4. During the rotation of the moving contact 5, the spring member 9 is driven to rotate by the driving groove 51. After rotating through a certain angle, the boss 92 on the spring member 9 contacts the cantilever 72 on the traction rod 7. As the rotation continues, the traction rod 7 begins to rotate, and the stopper 71 on the traction rod 7 pushes the drive rod 8 to slide. The front of the drive rod 8 contacts the mechanism trip rod 64, pushing it to rotate. After reaching the trip angle, the mechanism 6 is released, achieving the tripping action. During the tripping process of the driving mechanism 6 , when the driving rod 8 reaches the tripping stroke position, the groove 101 on the lock catch 10 cooperates with the locking hook 82 on the driving rod 8 , and the driving rod 8 is locked under the action of the first return spring 11 .

[0039] After the moving contact 5 rotates to the maximum angle, it begins to fall back. At this time, the spring member 9 resets, and the traction rod 7 begins to reset under the action of the second reset spring 12. After a certain stroke, the spring member 9 and the traction rod 7, the stopper 71 on the traction rod 7 and the driving rod 8 are all out of contact. At this time, the driving rod 8 is locked by the lock buckle 10 and cannot be reset.

[0040] The reset process of the quick release device in a specific embodiment of the present invention is as follows: the tripping rod 64 on the mechanism 6 releases the mechanism 6 and begins to trip. At this time, the main shaft 61 on the mechanism 6 begins to rotate, and the driving surface 62 on one side of the main shaft 61 rotates with the main shaft 61. After rotating to a certain angle, the driving surface 62 contacts the lock catch 10, pushing the lock catch 10 to rotate in a direction away from the driving rod 8. When the groove 101 on the lock catch 10 separates from the locking hook 82 on the driving rod 8, the driving rod 8 is reset under the action of the first reset spring 11 until it reaches the initial position. After the trip is completed, the driving surface 62 and the lock catch 10 remain in a certain position, and a certain safety gap exists between the lock catch 10 and the driving rod 8. When the mechanism 6 is closed, the driving surface 62 releases the lock catch 10, and the lock catch 10 contacts the driving rod 8 under the action of the first reset spring 11, thus completing a working cycle.

[0041] Specific examples are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A quick release device, comprising a mechanism and a rotating shaft, both of which are mounted on a base, and a moving contact mounted on the rotating shaft, characterized in that: A spring member is mounted on the movable contact, and the mechanism comprises a traction rod, a trip rod, and a side plate. The traction rod and the trip rod are both rotatably mounted on the side plate, and a driving rod is movably mounted on the side plate, one end of the driving rod is in contact with the trip rod, and the other end of the driving rod is in contact with the traction rod. The driving rod is a plate-shaped integral structure, comprising a first vertical portion, a first horizontal portion, a second vertical portion, and a second horizontal portion. A contact portion is provided at the upper end of the first vertical portion, and the contact portion contacts and cooperates with the tripping rod. The first vertical portion is connected to the second vertical portion via the first horizontal portion, the lower end of the second vertical portion is connected to the second horizontal portion, and one end of the second horizontal portion contacts and cooperates with the traction rod. A stopper and at least one cantilever are provided on the traction rod. The stopper is in contact with and matched with the other end of the driving rod, and the cantilever is in contact with and matched with the spring member.

2. The quick release device according to claim 1, characterized in that: A locking hook is provided at the middle of the first vertical portion, and the locking hook contacts and cooperates with a lock buckle installed on the mechanism.

3. The quick release device according to claim 1, characterized in that: The first horizontal portion is provided with a first guide groove, and the first guide groove is used to accommodate a guide column provided on the mechanism.

4. The quick release device according to claim 3, characterized in that: The first vertical portion is further provided with a second guide groove, and the second vertical portion is provided with a third guide groove. The second guide groove and the third guide groove are used to accommodate guide posts provided at corresponding positions on the mechanism.

5. The quick release device according to claim 4, characterized in that: The first guide groove, the second guide groove and the third guide groove are oblong hole structures with the same size and the same direction.

6. The quick release device according to claim 1, characterized in that: It also includes a locking device, which includes a lock and a first return spring. The lock is rotatably mounted on the side panel, one end of the lock cooperates with one end of the drive rod, and one side of the lock cooperates with the main shaft of the mechanism. The two ends of the first return spring act on the lock and the drive rod respectively.

7. The quick release device according to claim 1, characterized in that: The number of the cantilevers is consistent with the number of poles of the circuit breaker.

8. A circuit breaker, characterized in that: The quick release device comprises the quick release device according to any one of claims 1 to 7.

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