CN211320033U

CN211320033U - Circuit breaker contact mechanism with quick switching-on function

Info

Publication number: CN211320033U
Application number: CN201922318788.1U
Authority: CN
Inventors: 徐�明; 王慧德
Original assignee: Xiamen Guoyan Technology Co ltd
Current assignee: Xiamen Guoyan Technology Co ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-08-21
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses a circuit breaker contact mechanism with quick switching-on function, including moving contact, mechanism support, mechanism main shaft, pivot and contact spring, fast-throw locking fastener and fast-throw tripping element, when the handle drives mechanism support and moving contact to close from the separating brake position to the stagnation position, the moving contact receives the blocking of the stop arm of fast-throw locking fastener and the first locking arm is buckled with the second locking arm to prevent the fast-throw locking fastener from rotating around the mechanism main shaft, so as to make the moving contact stop 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 moving contact is quickly switched on under the action of the contact spring. The contact mechanism has the advantages of long service life, small occupied space, simple structure and high reliability.

Description

Circuit breaker contact mechanism with quick switching-on function

Technical Field

The utility model relates to a circuit breaker field especially relates to a circuit breaker contact mechanism with quick combined floodgate function.

Background

As is known to all, when a miniature circuit breaker is switched on or switched off with load, electric arcs can be generated between contacts, and the electric arcs can ablate moving and static contacts of the circuit breaker, so that the size and the transfer extinguishing time of the electric arcs between the contacts have obvious influence on the electric service life of the miniature circuit breaker. Compared with the opening of the switch, the arc suppression between the contacts of the miniature circuit breaker is more important when the switch is closed, because the opening speed of the contacts of the circuit breaker is driven by a mechanism spring, the speed is generally higher and more stable, and the closing speed of the circuit breaker is influenced by manpower or an operation motor, the speed is generally lower, the arc burning time is long, the damage to the contacts is large, and particularly, the influence is obvious on the miniature circuit breaker with large rated current.

The external circuit breaker of electric energy meter or other intelligent circuit breakers with motor-driven switching-on through remote control system developed in recent years, the switching-on of the circuit breaker is driven by the motor of the control module, the switching-on generally needs about 2 seconds, the switching-on speed is slower than the common manual switching-on speed, the rated current of the external circuit breaker of electric energy meter is generally larger and generally more than 63A, and obvious electric arc can be generated between contacts during switching-on and switching-off, so the current external circuit breaker product of electric energy meter on the market has the electrical service life which is difficult to meet the requirement.

In conclusion, the development of a circuit breaker contact mechanism with high switching-on speed, practicability, reliability and simple structure has positive influence on prolonging the service life of the miniature circuit breaker and the development of the whole circuit breaker industry.

The patent provides an instantaneous closed structure and switching device (201720492534.X) and miniature circuit breaker structure of closing a floodgate soon (201620120982.X), their mechanism of throwing soon especially throws the mechanism of throwing fast energy storage structure (energy storage spring) and establishing in handle department, its fast closing drive power is provided by the energy storage spring of handle department, need overcome the rotational resistance of whole contact mechanism or the sliding friction resistance of mechanism part during the fast closing, fast closing resistance is big, whole contact mechanism's quality is big simultaneously, inertia is also big, the acceleration of fast closing is little, therefore its fast closing speed can't compare with this scheme, current scheme is in addition when fast closing a floodgate to spare parts such as contact mechanism's U type connecting rod, mechanism support impact is great, make these spare parts warp easily thereby make circuit breaker performance drift.

The typical structure of intelligent circuit breaker is that one side at the circuit breaker sets up intelligent control module, intelligent control module's motor gear system closes a floodgate action for rectangle or other non-circular transmission shaft drive each pole circuit breaker handle through the cross sectional shape who runs through each pole handle rotation axis of circuit breaker, consequently this kind of intelligent circuit breaker's handle axle center all is provided with a rectangle or other non-circular through-holes in order to hold the transmission shaft, current set up the quick-throw mechanism of energy storage structure on the handle, its energy storage mechanism has taken most handle space and has made handle part intensity weaken by a wide margin, easy deformation or fracture, the transmission hole in the handle diminishes simultaneously, interior shaft drive's stability and transmission efficiency have been weakened, lead to interior shaft hole fracture easily, it is out of shape, thereby the drive ratio is unstable influences intelligent circuit breaker's performance.

The existing quick-throw mechanism with an energy storage structure (an energy storage spring) arranged at a handle and other existing quick-throw mechanisms combine a quick-throw functional piece and a circuit breaker contact mechanism functional piece, and once the quick-throw mechanism fails, the basic protection function of the circuit breaker is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model provides a circuit breaker contact mechanism with quick combined floodgate function, it has overcome in the background art the not enough of prior art.

The utility model provides a technical scheme that its technical problem adopted is:

a circuit breaker contact mechanism with a quick closing function comprises:

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.

In one embodiment: 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.

In one embodiment: the component that acts in synchronism with the handle includes the mechanism bracket or the handle itself.

In one embodiment: the component which synchronously acts with the opening of the moving contact comprises a mechanism bracket or the moving contact.

In one embodiment: 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.

In one embodiment: 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.

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

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

1. the moving contact is mainly switched on in three stages: the handle drives a closing stage, an energy storage stagnation stage and a spring drive closing stage, the moving contact is quickly closed at the spring drive closing stage, the resistance is small and high in speed, the moving contact is directly driven by the contact spring when being quickly closed, the resistance of the moving contact is overcome, the driving force is direct, the resistance is small, the overall closing speed of the contact is higher, and the problem that the arc firing time is too long due to the low closing speed in the background technology is solved.

2. The contact mechanism can keep the distance between the movable contact and the fixed contact at a larger distance and has good consistency during the stagnation period of the movable contact according to design requirements, and ensures that the movable contact cannot be broken down to generate electric arcs between the movable contact and the fixed contact during the stagnation period.

3. The present case its realization of throwing the function soon of contact mechanism only increased two parts of jump fastener and the snap close piece of throwing soon than traditional contact mechanism, moreover, the steam generator is simple in structure, the part number is few, the reliability is high, occupation space is little, do not influence the operation of the original structure of circuit breaker, this point is particularly important in the circuit breaker of big rated current, because in the space of injecing, the electrically conductive piece of big rated current major loop is thick, very big space has been occupied, the space of reserving for contact mechanism function piece and throwing mechanism is very little, this makes current mechanism scheme of throwing soon difficult to realize, less occupation space can vacate bigger space for the major loop conductor.

4. The moving contact mechanism has the advantages that the quick-throw functional parts of the moving contact mechanism do not occupy the space where the handle is located, the strength of the handle parts is not weakened, and adverse effects on a transmission structure of an intelligent circuit breaker driven by an inner shaft of the handle are avoided.

5. The mechanism that throws soon of present case scheme is kept away from the contact position that generates heat of contact, and no matter whether the spare part that throws soon is with metal or with the plastic part preparation, all has better high temperature adaptability, and the specially adapted large rated current circuit breaker uses.

6. The contact mechanism of present case increases the jump of throwing soon and throws the hasp piece soon, combines the contact spring to realize quick combined floodgate, and this design concept is ingenious, realizes the creative design from scratch, and the creativity is high.

7. The quick-throw mechanism (quick-throw trip buckle, quick-throw locking fastener) and each functional part of the circuit breaker are mutually independent, and other normal functions of the circuit breaker cannot be influenced even if the quick-throw mechanism fails.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic view of the contact mechanism in an open state.

Fig. 1(a) is a schematic view of a quick-release fastener.

Fig. 1(b) is a schematic view of a quick-throw jump fastener.

Fig. 1(c) is a schematic view of the movable contact.

FIG. 1(d) is a schematic view of a mechanism mount.

Fig. 2 is a schematic diagram of a contact mechanism of a quick-throw snap fastener and a quick-throw locking fastener in an initial tripping state.

Fig. 3 is a schematic diagram of a contact mechanism at the moment of tripping of a quick-throw snap fastener and a quick-throw locking fastener.

Fig. 4 is a schematic diagram of a contact mechanism at the moment when the moving contact is rapidly closed.

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

Fig. 6 is a structural view of the contact mechanism in the opening state.

Fig. 7 is a contact mechanism diagram of the quick-throw snap fastener and the quick-throw locking piece starting to be in an unbuckled state.

Fig. 8 is a contact mechanism diagram at the moment when the quick-throw snap fastener and the quick-throw locking fastener are released.

Fig. 9 is a contact mechanism diagram at the moment of rapid closing of the movable contact.

Fig. 10 is a contact mechanism diagram in a closing state.

Fig. 11 is a partial configuration view of the contact mechanism.

Fig. 12 is a structural view of a quick-throw buckle.

Fig. 13 is a structural view of the quick release fastener.

Fig. 14 is a schematic view of a contact mechanism.

Fig. 15 is a second schematic structural view of the contact mechanism.

Detailed Description

Referring to fig. 1 to 15, a contact mechanism of a circuit breaker with a fast switching function includes a moving contact 1, a mechanism bracket 2, a mechanism spindle 3, a pivot 4 and a contact spring 5; a mechanism main shaft 3 is fixed on a breaker shell 100, a mechanism support 2 is rotationally connected with the mechanism main shaft 3, the middle part of a moving contact 1 is in abutting contact with the mechanism main shaft 3 (the abutting contact can be the clearance contact of the mechanism main shaft 3 and a hole arranged on the moving contact 1, or the contact of the mechanism main shaft 3 and the side surface of the moving contact 1), one end of the moving contact 1 is hinged with the free end of the mechanism support 2 through a pivot 4, the other end of the moving contact 1 is provided with a moving contact, a handle 6 is linked with the mechanism support 2, a contact spring 5 is connected between the mechanism support 2 and the moving contact 1, the contact spring 5 may be a tension spring, a torsion spring, etc., and in this embodiment, the contact spring 5 is a tension spring, one end of the energy-stored contact spring 5 can drive the moving contact 1 to rotate around the mechanism main shaft 3 and switch on.

The contact mechanism further comprises a tripping piece 7 and a locking piece 8, the tripping piece 7 is connected between the pivot 4 and the handle 6, the tripping piece 7 is in pivot connection with the pivot 4, the handle 6 is connected with the tripping piece 7 (connected through a pull rod 61) and is linked with the mechanism support 2 through the tripping piece 7, and the locking piece 8 is in pivot connection with the mechanism main shaft 3 and can realize closing lock and overload opening tripping with the tripping piece 7.

The contact mechanism further comprises a quick-throw locking fastener 9 and a quick-throw tripping fastener 10, wherein the quick-throw locking fastener 9 is rotatably connected with the mechanism main shaft 3 and is provided with a stop arm 91, a first locking arm 92 and a reset stop arm 93, the quick-throw tripping fastener 10 is rotatably connected to the breaker shell 100 and is provided with a second locking arm 101, a trip arm 102, a connecting arm 103 and an elastic piece (not shown in the figure), and the elastic piece is connected between the connecting arm 103 and the breaker shell 100 and used for providing elastic potential energy for the quick-throw tripping fastener 10 to enable the first locking arm 92 and the second locking arm 101 to be kept in a buckling state.

The contact mechanism further comprises a mechanism spring 11 and a locking spring 12, wherein the mechanism spring 11 is used for providing opening power for the contact mechanism, and the locking spring 12 is used for providing resetting force for a locking piece.

The switching-on process of the contact mechanism described in this embodiment is specifically divided into three switching-on stages:

the handle drives the closing stage: under the action of manpower or other operation external force, the handle 6 drives the mechanism support 2 and the moving contact 1 to switch on from a switch-off position to a stop position, at the stop position, the moving contact 1 touches the stop arm 91 of the quick-throw locking piece 9, and because the first locking arm 92 and the second locking arm 101 are buckled under the action of the elastic piece of the quick-throw tripping fastener 10, the quick-throw locking piece 9 cannot rotate around the mechanism main shaft 3, so that the moving contact 1 cannot continue to rotate to switch on, namely, the switch-on is stopped at the stop position;

and (3) a stagnation energy storage stage: after the moving contact 1 is switched on in a stopped state, under the action of manpower or other external forces, the handle 6 continues to move towards the switching-on direction, the rotation of the handle 6 drives the mechanism support 2 to continue to rotate around the mechanism main shaft 3 for switching on (the mechanism support 2 and the moving contact 1 can rotate relatively on the pivot 4), along with the continuous rotation of the mechanism support 2, the deformation of the contact spring 5 is gradually increased, and the contact spring 5 stores energy;

spring-driven closing stage: the handle 6 continues to act until a part (including the mechanism bracket 2 or the handle 6 itself or other parts) which synchronously acts with the handle 6 touches the trip arm 102 of the quick-throw trip fastener 10 and pushes the second latch arm 101 to trip the second latch arm 101 and the first latch arm 92, at this moment, the quick-throw trip member 9 can rotate around the mechanism spindle 3, the blocking effect of the stop arm 91 on the movable contact 1 disappears, the quick-throw trip member is released, and the movable contact 1 can be rapidly switched on under the action of the contact spring 5.

When the circuit breaker contact mechanism is opened, the reset arm 93 of the quick-throw locking piece 9 can be abutted against a part (including the mechanism bracket 2 or the moving contact 1 or other parts) which synchronously acts with the opening of the moving contact 1 when the moving contact 1 is opened, the quick-throw locking piece 9 is reset under the driving of the moving contact 1, and the reset first locking arm 92 and the reset second locking arm 101 are buckled again.

The present case contact mechanism design benefit, unique creativity can realize the divide-shut brake of circuit breaker effectively, reliably, can also prolong the life of circuit breaker contact simultaneously, promotes the innovation and the development of circuit breaker trade.

The above description is only a preferred embodiment of the present invention, and therefore the scope of the present invention should not be limited by this description, and all equivalent changes and modifications made within the scope and the specification of the present invention should be covered by the present invention.

Claims

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:

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.