A quick tripping device and circuit breaker

Abstract

The present invention proposes a quick release device comprising a tripper, a mechanism, a rotating shaft, and a base. The tripper, mechanism, and rotating shaft are all mounted on the base. The tripper is mounted on one side of the mechanism. A moving contact and a spring member are mounted on the rotating shaft. A locking device is provided at one end of the tripper. The locking device comprises a guide seat, a push rod, a first spring, and a limit pin. The guide seat is mounted on the tripper seat by screws. The guide seat is provided with a spring slot and a guide slot. The push rod is mounted in the guide slot so as to be movable vertically. One end of the first spring is positioned in the spring slot, and the other end of the first spring is limited by a limit pin mounted on the guide seat. The quick release device of the present invention advances the mechanism's action time, releasing the mechanism before the moving contact is repelled and falls back, thus preceding the controller action and shortening the total disconnection time.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-voltage circuit breakers, and in particular relates to a quick tripping device for a circuit breaker. 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, which is integrated into the existing tripper. Through an intermediate transmission device, the moving contact and the mechanism tripping rod are linked together, and the tripping rod is released after the moving contact bounces a certain angle, thereby allowing the mechanism to trip quickly.

[0005] To achieve the above-mentioned objectives, the present invention proposes a quick release device including a release, a mechanism, a rotating shaft and a base, wherein the release, mechanism and rotating shaft are all installed on the base, the release is installed on one side of the mechanism, and a moving contact and a spring member are installed on the rotating shaft, characterized in that: a locking device is provided at one end of the release, and the locking device includes a guide seat, a push rod, a first spring and a limit pin, the guide seat is installed on the release seat, and a spring groove and a guide groove are provided on the guide seat, the push rod is installed in the guide groove in a manner that it can move up and down in the vertical direction, one end of the first spring is placed in the spring groove, and the other end of the first spring is limited by a limit pin installed on the guide seat.

[0006] In the above-mentioned quick release device, a limiting arm, a first locking surface and an unlocking hole are provided on one side of the push rod. The first locking surface cooperates with the second locking surface on the driving rod, and the limiting arm cooperates with the limiting surface on the release seat. The unlocking hole is used to accommodate the driving rod installed on the release in the released state.

[0007] In the above-mentioned quick release device, the tripper includes a magnetic flux, a push rod, a second trip rod and a tripper base. The magnetic flux, push rod and second trip rod are installed on the tripper base. The second trip rod contacts the first trip rod on the mechanism. A return spring is installed on the second trip rod. The push rod is arranged in front of the magnetic flux in a manner that can move back and forth along its axis.

[0008] In the above-mentioned quick release device, the release also includes a reset member, which is rotatably mounted on the release seat. The reset member cooperates with the second cantilever on the mechanism. Under the action of the second cantilever, the reset member rotates to drive the push rod to perform reciprocating motion.

[0009] In the above-mentioned quick release device, the release also includes a driving rod, which is arranged on one side of the release in a manner that can move along its axial direction. One end of the driving rod cooperates with one end of the release rod, and the other end of the driving rod is limited by a boss on the release seat and a spring installed on the driving rod.

[0010] In the above-mentioned quick release device, the release further includes a slider, one end of the slider cooperates with the reset member, and the other end of the slider cooperates with the drive rod.

[0011] In the above-mentioned quick release device, the mechanism includes a first tripping rod and a traction rod. The first tripping rod cooperates with the second tripping rod on the release, and the traction rod is rotatably mounted on the mechanism.

[0012] In the above-mentioned quick release device, a second spring and at least one first cantilever are provided on the traction rod, and the first cantilever cooperates with the boss on the spring member, and the traction rod can be driven to rotate through the boss.

[0013] In the above-mentioned quick trip device, the number of the first 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 effects:

[0016] 1. The quick trip device advances the action time of the mechanism, releases the mechanism before the moving contact opens and falls back, and is ahead of the controller action, shortening the total disconnection time.

[0017] 2. The quick trip device is independent of the magnetic flux trip device. The quick trip device does not operate during instantaneous or delayed tripping.

[0018] 3. After the quick trip device is activated, it can be reset automatically through normal opening and closing of the mechanism, meeting the requirements of multiple protection actions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the installation structure of a quick release device according to a specific embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the installation structure of the quick release device in another direction according to a specific embodiment of the present invention;

[0021] Figure 3 This is a structural schematic diagram of a quick trip device in a closed state according to a specific embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the bounce tripping process of a quick trip device according to a specific embodiment of the present invention;

[0023] Figure 5 This is a structural schematic diagram of a quick trip device in a tripped state according to a specific embodiment of the present invention;

[0024] Figure 6 This is a structural schematic diagram of a tripping structure in a reset state according to a specific embodiment of the present invention;

[0025] Figure 7 for Figure 6 A schematic diagram of the structure of the tripping structure in another direction;

[0026] Figure 8 This is a structural schematic diagram of a tripping structure in a tripping state according to a specific embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the tripping transmission process of a tripping structure according to a specific embodiment of the present invention;

[0028] Figure 10 This is a schematic structural diagram of the tripping process of the driving rod in a quick tripping device according to a specific embodiment of the present invention;

[0029] Figure 11 This is a schematic structural diagram of the reset process of the driving rod in a quick release device according to a specific embodiment of the present invention;

[0030] Figure 12 This is a diagram showing the internal structure of a quick release device in a driving state of a push rod in a specific embodiment of the present invention;

[0031] Figure 13 This is a diagram showing the internal structure of a quick release device in a reset state of a push rod in a specific embodiment of the present invention;

[0032] Figure 14for Figure 13 Schematic diagram of the cross-sectional structure;

[0033] Figure 15 This is a schematic structural diagram of a guide seat in a quick release device according to a specific embodiment of the present invention;

[0034] Figure 16 This is a schematic structural diagram of a push rod in a quick release device according to a specific embodiment of the present invention;

[0035] Serial number description:

[0036] 1-base, 2-cover, 3-rotating shaft, 4-static contact, 5-moving contact, 6-spring, 7-traction rod, 8-mechanism, 9-tripper, 10-guide seat, 11-top rod, 12-first spring, 13-limit pin, 14-slider, 15-screw, 16-second spring, 51-drive slot, 61-push rod, 62-first boss, 71-first cantilever, 72-stop, 81-first tripping rod, 82-limiting slot, 83-main shaft, 84-second cantilever, 91-tripper Seat, 911-limiting surface, 92-magnetic flux, 93-second tripping rod, 94-reset spring, 95-top rod, 96-reset member, 97-driving rod, 98-spring, 101-spring groove, 102-guide groove, 103-pin hole, 104-mounting hole, 111-limiting arm, 112-mounting groove, 113-driving arm, 114-first locking surface, 115-unlocking hole, 141-first driving surface, 142-second driving surface, 971-boss, 972-second locking surface. DETAILED DESCRIPTION

[0037] 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.

[0038] like Figure 1-8As shown, a quick release device in a specific embodiment of the invention includes a tripper 9, a mechanism 8, a rotating shaft 3, and a base 1. The tripper 9, mechanism 8, and rotating shaft 3 are all mounted on the base 1 and the cover 2. The tripper 9 is mounted on one side of the mechanism 8. A movable contact 5 and a spring 6 are mounted on the rotating shaft 3. A locking device is provided at one end of the tripper 9. The locking device includes a guide base 10, a push rod 11, a first spring 12, and a stop pin 13. The guide base 10 is screw-mounted on the tripper base 91. The guide base 10 is provided with a spring slot 101 and a guide slot 102. The push rod 11 is mounted in the guide slot 102 for vertical movement. One end of the first spring 12 is positioned in the spring slot 101, and the other end of the first spring 12 is stopped by a stop pin 13 mounted on the guide base 10. The movable contact 5 is driven by a driving slot 51 to engage with the spring 6, driving the spring 6 to rotate when the movable contact 5 is opened. The quick trip device of the present invention advances the action time of the mechanism, releases the mechanism before the moving contact is repelled and falls back, and is ahead of the controller action, thus shortening the total disconnection time.

[0039] Mechanism 8 is equipped with a drawbar 7, which can rotate along its axis through a certain angle. First cantilever arms 71 are positioned at corresponding phase positions, engaging with first bosses 62 at the rear of the spring element 6 on the rotating shaft 3. The number of these cantilever arms 71 corresponds to the number of poles in the circuit breaker. The first bosses 62 at the rear of the spring element 6 drive the first cantilever arms 71, thereby rotating the drawbar 7. A second spring 16 is mounted on the drawbar 7 to maintain a fixed position during normal operation. A first trip lever 81 is positioned at the front of mechanism 8, engaging with a second trip lever 93 in the trip unit 9. The first trip lever 81 is used to release mechanism 8 for tripping. A second cantilever arm 84 is positioned on the main shaft 83 on one side of mechanism 8. This second cantilever arm 84 engages with a reset member 96 of the trip unit 9 to reset the trip unit 9. After the quick trip mechanism of the present invention is actuated, it can be automatically reset by normal opening and closing of mechanism 8, meeting the requirements for multiple protective actions.

[0040] The trip device 9 is mounted on one side of the mechanism 8 and includes a magnetic flux 92, a second trip rod 93, a reset spring 94, a push rod 95, a reset element 96, and a drive rod 97. One end of the magnetic flux 92 contacts the push rod 95 and is equipped with trip-related devices. The top portion is the magnetic flux 92, the second trip rod 93, and the reset spring 94. The magnetic flux 92 acts unidirectionally on the first trip rod 81 of the mechanism 8 through the second trip rod 93. A push rod 95 is provided in front of the magnetic flux 92. The push rod 95 is axially movable and resets the second trip rod 93 after the magnetic flux 92 is actuated. Reset elements 96 are arranged on both sides of the push rod 95 and are acted upon by the second cantilever 84 of the mechanism 8 to drive the push rod 95. The quick trip device of the present invention is independent of the magnetic flux trip device and does not operate during instantaneous or delayed tripping.

[0041] A drive rod 97 is positioned on the side of the trip unit 9. One end of the drive rod 97 engages with the second trip rod 93, driving the second trip rod 93 in one-way rotation. The drive rod 97 is restrained by the trip unit base 91 and can move axially during operation. Multiple retaining bosses 971 are positioned along the drive rod's axis. A spring 98 is mounted on the drive rod 97, driving the axial movement of the drive rod 97. A slider 14 is positioned between the trip unit base 91 and the drive rod 97. Its two sides engage with the reset member 96 and the drive rod 97, respectively. The reset member 96 drives the drive rod 97 to slide and reset it.

[0042] like Figure 9-16 As shown, a locking device is provided at one end of the tripper 9 and includes a guide base 10, a push rod 11, a first spring 12, and a stop pin 13. The guide base 10 is mounted on the tripper base 91 and contains the first spring 12 and push rod 11. The push rod 11 can slide along a mounting groove 112 within the guide base 10. The first spring 12 is mounted in a bottom spring groove 101, and the stop pin 13 and the first spring 12 maintain the push rod 11 in a fixed position. A driving arm 113 at the bottom of the push rod 11 extends out of the tripper base 91 and engages with the first cantilever 71 of the traction rod 7 in the mechanism 8. This can drive the push rod 11 to slide along the guide groove 102 of the guide base 10. One side of the push rod 11 is provided with a stop arm 111, a first locking surface 114, and an unlocking hole 115. The first locking surface 114 engages with the second locking surface 972 on the drive rod 97, while the stop arm 111 engages with the stop surface 911 on the tripper base 91. When push rod 11 is in its reset state, first locking surface 114 locks drive rod 97, and spring 98 on drive rod 97 is compressed. When push rod 11 is in its raised state, drive rod 97 is released. Under the action of spring 98, drive rod 97 slides axially and passes through unlocking hole 115, driving second tripping rod 93 to rotate, thereby driving first tripping rod 81 of mechanism 8 to rotate and release mechanism 8. When push rod 11 is in its raised position, drive rod 97 extends through unlocking hole 115, locking push rod 11. First spring 12 is compressed, preventing push rod 11 from resetting. After the drive rod 97 is reset, push rod 11 is reset under the action of first spring 12.

[0043] 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, there is a certain safety gap between the spring member 6 and the first cantilever 71 of 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 6 is driven to rotate by the tail drive groove 51. After rotating through a certain angle, the first boss 62 at the tail of the spring member 6 contacts the first cantilever 71 of the traction rod 7. During the continued rotation, the traction rod 7 begins to rotate and drives the top rod 11 in the tripper 9 to slide along the guide groove 102 of the guide seat 10, thereby completing the motion transfer from the moving contact 5 to the traction rod 7.

[0044] When the drawbar 7 rotates, the first cantilever 71 of the drawbar 7 acts on the push rod 11, converting the rotational motion into a linear motion of the push rod 11. A certain locking dimension exists between the first locking surface 114 of the push rod 11 and the drive rod 97. When the push rod 11 has completed its locking travel, the unlocking hole 115 releases the drive rod 97. Driven by the spring 98, the drive rod 97 begins to move axially, completing the motion transfer from the drawbar 7 to the push rod 11.

[0045] Drive rod 97 moves axially under the action of spring 98. After a certain travel, drive rod 97 drives second trip rod 93 in trip unit 9 to rotate. After a certain rotational travel, drive rod 97 drives first trip rod 81 of mechanism 8 to rotate, and mechanism 8 begins to operate. Moving contact 5 rotates to its maximum angle and then begins to fall back. At this time, spring member 6 returns to its original position with moving contact 5. Draw rod 7 begins to return to its original position under the action of second spring 16. After a certain travel, spring member 6 and draw rod 7, and draw rod 7 and push rod 11, all lose contact. At this time, second locking surface 972 of drive rod 97 penetrates unlocking hole 115, locking drive rod 97 and preventing push rod 11 from returning to its original position.

[0046] The reset process of the quick release device in one embodiment of the present invention is as follows: After the first trip lever 81 of mechanism 8 releases mechanism 8, mechanism 8 begins to trip. At this point, the main shaft 83 of mechanism 8 begins to rotate, and the second cantilever 84 at the end of main shaft 83 drives the reset member 96 of the release 9 to rotate. As the reset member 96 rotates, the second drive surface 142 drives the slider 14 toward the direction of the magnetic flux 92. During this movement, the slider 14 acts on the boss 971 of the drive rod 97 via the first drive surface 141, causing the drive rod 97 to move axially. During the reset process of the drive rod 97, the second trip lever 93 of the release 9 rotates synchronously toward the direction of the magnetic flux 92 under the action of the reset spring 94 until it returns to its initial state. When the drive rod 97 loses contact with the first locking surface 114 of the push rod 11, the push rod 11 is released and reset under the action of the first spring 12. After the mechanism 8 is opened, a certain gap exists between the drive rod 97 and the first locking surface 114. When the mechanism 8 is closed, the second cantilever 84 is out of contact with the reset member 96, and the slider 14 no longer generates a retaining force on the drive rod 97. Under the action of the spring 98, the second locking surface 972 of the drive rod 97 moves to a position in contact with the first locking surface 114 and is locked by the push rod 11, thus completing a working cycle.

[0047] 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 tripping device comprising a tripper, a mechanism, a rotating shaft, and a base, wherein the tripper, the mechanism, and the rotating shaft are all mounted on the base, the tripper is mounted on one side of the mechanism, and a moving contact and a spring member are mounted on the rotating shaft, characterized in that: A locking device is provided at one end of the release, and the locking device includes a guide seat, a push rod, a first spring and a limit pin. The guide seat is mounted on the release seat, and a spring groove and a guide groove are provided on the guide seat. The push rod is mounted in the guide groove in a manner that it can move up and down in the vertical direction. One end of the first spring is placed in the spring groove, and the other end of the first spring is limited by the limit pin mounted on the guide seat. A limiting arm, a first locking surface and an unlocking hole are provided on one side of the push rod, the first locking surface cooperates with the second locking surface on the driving rod, the limiting arm cooperates with the limiting surface on the release seat, and the unlocking hole is used to accommodate the driving rod installed on the release in the released state; The trip device includes a magnetic flux, a push rod, a second trip rod and a trip device base, wherein the magnetic flux, the push rod and the second trip rod are mounted on the trip device base, the second trip rod contacts the first trip rod on the mechanism, a return spring is mounted on the second trip rod, and the push rod is arranged in front of the magnetic flux in a manner that it can move back and forth along its axis; The release further includes a reset member, which is rotatably mounted on the release base and cooperates with a second cantilever on the mechanism. Under the action of the second cantilever, the reset member rotates, thereby driving the ejector rod to perform reciprocating motion. The release includes a driving rod, which is arranged on one side of the release in a manner that it can move along its axial direction, one end of the driving rod is engaged with one end of the second release rod, and the other end of the driving rod is limited by a boss on the release seat and a spring installed on the driving rod; The mechanism comprises a first tripping rod and a traction rod. The first tripping rod cooperates with a second tripping rod on the tripper. The traction rod is rotatably mounted on the mechanism.

2. The quick release device according to claim 1, characterized in that: The release further includes a slider, one end of which cooperates with the reset member, and the other end of which cooperates with the drive rod.

3. The quick release device according to claim 1, wherein: The traction rod is provided with a second spring and at least one first cantilever. The first cantilever cooperates with the boss on the spring member, and the traction rod can be driven to rotate through the boss.

4. The quick release device according to claim 3, characterized in that: The number of the first cantilevers is consistent with the number of poles of the circuit breaker.

5. A circuit breaker, characterized in that: The quick release device comprises the quick release device according to any one of claims 1 to 4.

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