CN211320033U - A circuit breaker contact mechanism with quick closing function - Google Patents

Abstract

The utility model discloses a circuit breaker contact mechanism with a quick closing function, comprising a moving contact, a mechanism bracket, a mechanism main shaft, a pivot shaft, a contact spring, a quick-release lock and a quick-release jumper, a handle When the driving mechanism bracket and the moving contact are closed from the opening position to the stagnant position, the moving contact is blocked by the stop arm of the quick-release lock, and the first locking arm and the second locking arm are engaged to prevent the quick release. The cast-lock fastener rotates around the main shaft of the mechanism to stop the moving contact from closing; the handle continues to move in the closing direction, the rotation of the handle drives the mechanism bracket to continue closing, and the contact spring begins to store energy; until the components that act synchronously with the handle The second locking arm and the first locking arm are pressed against the tripping arm of the quick-release jumper, and at this time, the moving contact is quickly closed under the action of the contact spring. The contact mechanism has long service life, small occupied space, simple structure and high reliability.

Description

A circuit breaker contact mechanism with quick closing function

technical field

The utility model relates to the field of circuit breakers, in particular to a circuit breaker contact mechanism with a quick closing function.

Background technique

As we all know, when a small circuit breaker is closed or opened under load, an arc will be generated between the contacts, and this arc will ablate the dynamic and static contacts of the circuit breaker. The impact of electrical life is very obvious. Compared with the opening, the arc suppression between the contacts during the closing of the small circuit breaker is more important, because the opening speed of the contacts of the circuit breaker is driven by the mechanism spring, and the speed is generally fast and stable, while the closing speed of the circuit breaker is more important. Affected by manpower or operating the motor, the general speed is slow, the arc burning time is long, and the damage to the contacts is large, especially for small circuit breakers with large rated currents.

The electric energy meter external circuit breaker developed in recent years or other intelligent circuit breakers driven by a motor through remote control, the closing of the circuit breaker is driven by the motor of the control module, and it generally takes about 2 seconds to close. The closing speed is slower than the general manual closing speed, and the rated current of the external circuit breaker of the electric energy meter is usually relatively large, generally more than 63A, and there will be obvious arcs between the contacts when closing and opening. The electrical life of the external circuit breaker product of the electric energy meter is difficult to meet the requirements.

In conclusion, the development of a circuit breaker contact mechanism with high closing speed, practicality, reliability and simple structure will have a positive impact on prolonging the service life of small circuit breakers and the development of the entire circuit breaker industry.

An instantaneous closing structure and a switch device (201720492534.X) and a small circuit breaker quick closing structure (201620120982.X) provided by the existing patent, their quick switching mechanism is especially the quick switching energy storage structure (energy storage spring ) The quick-turning mechanism located at the handle, its quick closing driving force is provided by the energy storage spring at the handle, and the quick closing needs to overcome the rotation resistance of the entire contact mechanism or the sliding friction resistance of the mechanism parts, and the quick closing The resistance is large, at the same time, the mass of the entire contact mechanism is large, the inertia is also large, and the acceleration of rapid closing is small, so the speed of rapid closing cannot be compared with this solution. The U-shaped link, mechanism bracket and other parts of the circuit breaker have a large impact, which is easy to deform these parts and cause the performance of the circuit breaker to drift.

The typical structure of an intelligent circuit breaker is to set an intelligent control module on one side of the circuit breaker. The motor gear system of the intelligent control module drives each circuit breaker through a rectangular or other non-circular transmission shaft with a cross-sectional shape that runs through the rotation axis of each pole handle of the circuit breaker. Therefore, the handle axis of this intelligent circuit breaker is provided with a rectangular or other non-circular through hole to accommodate the transmission shaft. The energy storage mechanism occupies most of the handle space, which greatly weakens the strength of the handle parts, which is easy to deform or break. At the same time, the transmission hole in the handle becomes smaller, which weakens the stability and transmission efficiency of the inner shaft transmission, which is easy to cause the inner shaft. The hole is cracked, deformed, and the transmission ratio is unstable, which affects the action performance of the intelligent circuit breaker.

The existing quick-release mechanism with the energy storage structure (energy-storage spring) arranged at the handle and other existing quick-release mechanisms combine the quick-release functional part with the circuit breaker contact mechanism function. Once the quick-release mechanism fails, Affects the basic protection function of the circuit breaker.

Utility model content

The utility model provides a circuit breaker contact mechanism with a quick closing function, which overcomes the deficiencies of the prior art described in the background art.

The technical scheme adopted by the utility model to solve its technical problems is:

A circuit breaker contact mechanism with quick closing function, comprising:

The moving contact, the mechanism bracket, the mechanism main shaft, the pivot shaft and the contact spring; the mechanism main shaft is fixed on the circuit breaker shell, one end of the mechanism bracket is rotatably connected with the mechanism main shaft, and the middle part of the movable contact is in abutting contact with the mechanism main shaft. One end of the contact and the free end of the mechanism bracket are hinged through a pivot, the handle is linked with the mechanism bracket, and the contact spring is connected between the mechanism bracket and the movable contact; and

The quick-shooting lock fastener and the quick-shooting jumper are rotatably connected with the main shaft of the mechanism, and have a stop arm and a first locking arm. Two locking arms, tripping arms, connecting arms and elastic parts, the elastic parts are connected between the connecting arms and the circuit breaker housing;

When the handle drives the mechanism bracket and the moving contact to close from the opening position to the stagnant position, the moving contact is blocked by the stop arm of the quick-release lock, and the first lock arm and the second lock arm are buckled to prevent The quick-release lock is rotated around the main shaft of the mechanism to stop the moving contact from closing;

The handle continues to move in the closing direction, the rotation of the handle drives the mechanism bracket to continue closing, and the contact spring begins to store energy; until the component that moves synchronously with the handle and the release arm of the quick-release jumper abut against the second lock The arm is tripped from the first locking arm, at this time the quick-casting lock is released, and the moving contact is quickly closed under the action of the contact spring.

In one embodiment: the quick-release lock also has a reset blocking arm, and when the circuit breaker contact mechanism is opened, the reset blocking arm can act synchronously with the moving contact opening when the moving contact is opened. The component abuts against and resets the quick-release locking piece under the driving of the moving contact, and the reset first locking arm and the second locking arm are re-buckled.

In one embodiment: the component acting synchronously with the handle includes a mechanism bracket or the handle itself.

In one embodiment, the component that acts synchronously with the opening of the moving contact includes a mechanism bracket or the moving contact itself.

In one embodiment: it also includes a jumper and a lock, the jumper is connected between the pivot and the handle, the jumper is pivotally connected to the pivot, the handle is connected to the jumper and is realized by the jumper Linked with the mechanism bracket, the locking piece is pivotally connected with the main shaft of the mechanism, and with the tripping piece, it can realize closing and snapping and overload opening and tripping.

In one embodiment, the form of the abutting contact is the clearance contact between the main shaft of the mechanism and the hole opened on the movable contact.

In one embodiment: the form of the abutting contact is the contact between the main shaft of the mechanism and the side surface of the movable contact.

Compared with the background technology, the technical solution has the following advantages:

1. The closing of the moving contact is mainly divided into three stages: the handle-driven closing stage, the stagnant energy storage stage and the spring-driven closing stage. In the spring-driven closing stage, the moving contact has a small resistance and fast closing resistance, and the speed is fast. When the head closes quickly, it is directly driven by the contact spring, as long as the resistance of the moving contact itself can be overcome, the driving force is direct and the resistance is small, so that the overall closing speed of the contact is faster, which also solves the problem of the closing of the background technology. The slow gate speed causes the arc burning time to be too long.

2. According to the design requirements, the contact mechanism described in this case can keep the distance between the moving contact and the static contact at a large distance and good consistency during the stagnation of the moving contact, which ensures that the moving contact of the moving contact is stagnant during the stagnation period. There will be no arcing between the static contact and the breakdown.

3. Compared with the traditional contact mechanism, the contact mechanism described in this case only adds two parts: the quick-shooting jumper and the quick-shooting lock, which has a simple structure, a small number of parts, and high reliability. It occupies a small space and does not affect the operation of the original structural parts of the circuit breaker. This is particularly important for circuit breakers with large rated currents, because in the limited space, the conductive parts of the main circuit with large rated currents are thick, occupying a lot of space, leaving The space for the functional parts of the contact mechanism and the quick switching mechanism is very small, which makes it difficult to realize the existing quick switching mechanism solution, and the smaller occupied space can make more space for the main circuit conductor.

4. In the moving contact mechanism described in this case, its quick-turning functional parts do not occupy the space where the handle is located, nor weaken the strength of the handle parts, and will not adversely affect the transmission structure of the intelligent circuit breaker driven by the inner shaft of the handle .

5. The quick-turning mechanism of the solution in this case is far away from the contact heat-generating parts of the contacts. Whether the quick-turning parts are made of metal or plastic parts, they have good high temperature adaptability, and are especially suitable for high-rated current circuit breakers.

6. The contact mechanism of this case is added with a quick-release jumper and a quick-release lock, combined with the contact spring to achieve quick closing. The design is clever and creative and creative.

7. The quick switch mechanism of this scheme (quick switch jumper, quick switch lock fastener) and the functional components of the circuit breaker are independent of each other. Even if the quick switch mechanism fails, it will not affect other normal functions of the circuit breaker.

Description of drawings

The utility model will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1 is a schematic diagram of the contact mechanism in an open state.

Figure 1(a) is a schematic diagram of a quick-release lock.

Figure 1(b) is a schematic diagram of a quick-shooting jumper.

Figure 1(c) is a schematic diagram of the moving contact.

Figure 1(d) is a schematic diagram of the mechanism bracket.

FIG. 2 is a schematic diagram of the contact mechanism in a state where the quick-shooting jumper and the quick-shooting lock are beginning to release.

FIG. 3 is a schematic diagram of the contact mechanism at the moment of tripping of the quick-shooting jumper and the quick-shooting lock.

Figure 4 is a schematic diagram of the contact mechanism at the moment when the moving contact is quickly closed.

Figure 5 is a schematic diagram of the contact mechanism in the closed state.

FIG. 6 is a structural diagram of the contact mechanism in an open state.

FIG. 7 is a diagram of the contact mechanism in a state where the quick-shooting jumper and the quick-shooting lock are beginning to release.

FIG. 8 is a diagram of the contact mechanism at the moment of tripping of the quick-shooting jumper and the quick-shooting lock.

FIG. 9 is a contact mechanism diagram at the moment when the moving contact is quickly closed.

Figure 10 is a diagram of the contact mechanism in the closed state.

FIG. 11 is a partial structural diagram of the contact mechanism.

FIG. 12 is a structural diagram of a quick-shooting jumper.

FIG. 13 is a structural diagram of a quick-release lock.

FIG. 14 is one of the schematic structural diagrams of the contact mechanism.

FIG. 15 is the second schematic diagram of the structure of the contact mechanism.

Detailed ways

Please refer to Figures 1 to 15, a circuit breaker contact mechanism with quick closing function, which includes a moving contact 1, a mechanism bracket 2, a mechanism main shaft 3, a pivot shaft 4 and a contact spring 5; the mechanism main shaft 3 is fixed On the circuit breaker housing 100, the mechanism bracket 2 is rotatably connected with the mechanism main shaft 3, and the middle part of the moving contact 1 is in abutting contact with the mechanism main shaft 3 (the abutting contact can be in the form of openings on the mechanism main shaft 3 and the moving contact 1). The gap contact between the holes, or the contact between the main shaft 3 of the mechanism and the side of the moving contact 1), one end of the moving contact 1 and the free end of the mechanism bracket 2 are hinged through the pivot 4, and the other end of the moving contact 1 is set to move Contact, the handle 6 is linked with the mechanism bracket 2, and the contact spring 5 is connected between the mechanism bracket 2 and the moving contact 1. The contact spring 5 can be a tension spring, a torsion spring, etc. In this embodiment, the contact spring 5 The head spring 5 is a tension spring, one end of which is fixed on the mechanism bracket 2, and the other end is fixed on the movable contact 1. The stored contact spring 5 can drive the movable contact 1 to rotate around the mechanism main shaft 3 and close.

The contact mechanism also includes a jumper 7 and a lock 8. The jumper 7 is connected between the pivot shaft 4 and the handle 6, the jumper 7 is pivotally connected to the pivot 4, and the handle 6 and the jumper 7 It is connected (connected by the pull rod 61) and realizes the linkage with the mechanism bracket 2 through the tripping member 7. The locking member 8 is pivotally connected with the main shaft 3 of the mechanism and can realize the closing buckle and overload opening and tripping with the tripping member 7 .

The contact mechanism also includes a quick-release lock 9 and a quick-release jumper 10 . The quick-release lock 9 is rotatably connected with the mechanism main shaft 3 and has a stop arm 91 , a first lock arm 92 , and a reset stop arm 93 . , the quick-release jumper 10 is rotatably connected to the circuit breaker housing 100, and has a second locking arm 101, a tripping arm 102, a connecting arm 103 and an elastic piece (not shown in the figure), and the elastic piece is connected to the connecting arm Between 103 and the circuit breaker housing 100 , it is used to provide elastic potential to the quick-shooting and jumper 10 to keep the first locking arm 92 and the second locking arm 101 in a snap-fit state.

The contact mechanism also includes a mechanism spring 11 and a locking spring 12. The mechanism spring 11 is used to provide opening power to the contact mechanism, and the locking spring 12 is used to provide a restoring force to the locking member.

The closing process of the contact mechanism described in this embodiment is as follows, and is specifically divided into three closing stages:

Handle-driven closing stage: Under the action of manpower or other external operating forces, handle 6 drives mechanism bracket 2 and moving contact 1 to close from the opening position to the stagnant position. In the stagnant position, the moving contact 1 touches the quick switch The stopper arm 91 of the locking member 9, and because the first locking arm 92 and the second locking arm 101 are engaged by the elastic member of the quick-shooting jumper 10, the quick-shooting locking member 9 cannot wrap around the mechanism The main shaft 3 rotates, so that the moving contact 1 cannot continue to rotate and close, that is, it stops closing at the stagnant position;

Stagnant energy storage stage: After the moving contact 1 is stagnant and closed, under the action of manpower or other external forces, the handle 6 continues to move in the closing direction. The bracket 2 and the movable contact 1 can rotate relatively on the pivot 4), as the mechanism bracket 2 continues to rotate, the deformation of the contact spring 5 gradually increases, and the contact spring 5 stores energy;

Spring-driven closing stage: the handle 6 continues to act until the components that act synchronously with the handle 6 (including the mechanism bracket 2 or the handle 6 itself or other components) touch the release arm 102 of the quick-release jumper 10 and push the second The locking arm 101 releases the second locking arm 101 from the first locking arm 92 . At this time, the quick-casting locking member 9 can rotate around the main shaft 3 of the mechanism, and the blocking effect of the stopper arm 91 on the moving contact 1 disappears. , the quick-release lock is released, and the moving contact 1 can be quickly closed under the action of the contact spring 5 .

When the contact mechanism of the circuit breaker is opened, the reset arm 93 of the quick-release lock 9 can act in synchronization with the opening of the moving contact 1 when the moving contact 1 is opened (including the mechanism bracket 2 or the opening of the moving contact 1). The moving contact 1 itself or other components) abuts and resets the quick-release locking member 9 under the driving of the moving contact 1, and the reset first locking arm 92 and the second locking arm 101 are re-buckled.

The contact mechanism described in this case is ingeniously designed and creative, and can effectively and reliably realize the opening and closing of the circuit breaker, and at the same time, it can prolong the service life of the circuit breaker contacts, and promote the innovation and development of the circuit breaker industry.

The above are only the preferred embodiments of the present invention, so the scope of implementation of the present invention cannot be limited according to this, that is, equivalent changes and modifications made according to the scope of the patent of the present invention and the contents of the description should still belong to the present invention. within the scope of the utility model.

Claims (7)

1. The utility model provides a circuit breaker contact mechanism with quick combined floodgate function which characterized in that: the method comprises the following steps:

the moving contact, the mechanism bracket, the mechanism main shaft, the pivot and the contact spring; the mechanism main shaft is fixed on the breaker shell, one end of the mechanism support is rotationally connected with the mechanism main shaft, the middle part of the moving contact is abutted against and contacted with the mechanism main shaft, one end of the moving contact is hinged with the free end of the mechanism support through a pivot, the handle is linked with the mechanism support, and the contact spring is connected between the mechanism support and the moving contact; and

the quick-throw trip device is rotationally connected with the mechanism main shaft and is provided with a stop arm and a first lock arm;

when the handle drives the mechanism support and the moving contact to switch on from the switch-off position to the stagnation position, the moving contact is blocked by the stop arm of the quick-throw locking piece, and the first locking arm and the second locking arm are buckled to prevent the quick-throw locking piece from rotating around the mechanism main shaft, so that the moving contact stops switching on;

the handle continues to move towards the closing direction, the rotation of the handle drives the mechanism bracket to continue closing, and the contact spring starts to store energy; until the part which synchronously acts with the handle is propped against the tripping arm of the quick-throw tripping fastener to trip the second locking arm and the first locking arm, at the moment, the quick-throw locking fastener is released, and the moving contact is rapidly switched on under the action of the contact spring.

2. The circuit breaker contact mechanism with a quick closing function according to claim 1, wherein: the quick-throw lock catch piece is further provided with a reset blocking arm, when the breaker contact mechanism is opened, the reset blocking arm can abut against a component which synchronously acts with the opening of the moving contact when the moving contact is opened, the quick-throw lock catch piece is reset under the driving of the moving contact, and the reset first lock catch arm and the reset second lock catch arm are buckled again.

3. The circuit breaker contact mechanism with the rapid closing function according to claim 1 or 2, characterized in that: the component that acts in synchronism with the handle includes the mechanism bracket or the handle itself.

4. The circuit breaker contact mechanism with the rapid closing function according to claim 2, wherein: the component which synchronously acts with the opening of the moving contact comprises a mechanism bracket or the moving contact.

5. The circuit breaker contact mechanism with the rapid closing function according to claim 1 or 2, characterized in that: the mechanism comprises a mechanism support, and is characterized by further comprising a tripping piece and a locking piece, wherein the tripping piece is connected between the pivot and the handle, the tripping piece is in pivot connection with the pivot, the handle is connected with the tripping piece and is linked with the mechanism support through the tripping piece, and the locking piece is in pivot connection with the mechanism main shaft and can realize closing lock and overload opening release with the tripping piece.

6. The circuit breaker contact mechanism with a quick closing function according to claim 1, wherein: the abutting contact is in a form that a main shaft of the mechanism is in clearance contact with a hole formed in the movable contact.

7. The circuit breaker contact mechanism with a quick closing function according to claim 1, wherein: the abutting contact is in the form of contact between a mechanism main shaft and the side face of the movable contact.

Images