CN215731545U - Anti-rebound mechanism of circuit breaker and circuit breaker - Google Patents

Abstract

The utility model relates to an anti-rebound mechanism of a circuit breaker, which comprises a cantilever, a limiting shaft, a buckle plate, an elastic element and a pressing part, wherein the pressing part is fixedly arranged, and when the cantilever swings in the middle of opening, the pressing part can press against the buckle plate, so that the buckle plate is pushed to overcome the elastic force of the elastic element to generate forward swing with a certain angle relative to the cantilever in advance, and the forward swing angle of the buckle plate is enough to realize the anti-rebound function after the buckle plate swings in the forward direction through inertia, thereby greatly improving the reliability and the stability of the anti-rebound mechanism. The pressing and supporting piece extends between the main shaft and the limiting shaft by a slender rod structure and is abutted against the groove of the buckle plate, and the pressing and supporting effect on the buckle plate can be realized without redesigning the appearance of the buckle plate; the pressing and supporting piece is also detachably connected, so that the position of the pressing and supporting piece can be conveniently adjusted, and the adjustment work in the product installation process is facilitated.

Description

Anti-rebound mechanism of circuit breaker and circuit breaker

Technical Field

The utility model relates to the technical field of circuit breaker manufacturing, in particular to an anti-rebound mechanism of a circuit breaker.

Background

In the mechanism of the universal circuit breaker, the anti-rebound function is very important, and the anti-rebound function can effectively prevent the impact rebound of a moving contact in the opening process of the circuit breaker, thereby avoiding the reignition of electric arc and ensuring the on-off performance of the circuit breaker. At present, a structure of a rebound prevention mechanism known in the art is shown in fig. 1, and includes a main shaft 1, a cantilever 2, a limit shaft 3 and a buckle plate 4, wherein the cantilever 2 is fixedly connected to the main shaft 1 and swings following the rotation of the main shaft 1, so as to have a swing stroke for realizing the opening and closing of a circuit breaker, the limit shaft 3 is fixedly arranged in the opening movement direction of the cantilever 2, and when the circuit breaker is opened, the cantilever 2 swings and impacts on the limit shaft 3 to limit the limit opening distance of a moving contact. The cantilever 2 is further pivoted with a buckling plate 4 for preventing rebounding, a torsion spring is assembled on a pivoting shaft of the buckling plate 4, one torsion arm of the torsion spring acts on the cantilever 2, and the other torsion arm acts on the buckling plate 4. Referring to fig. 2, when the cantilever 2 is opened and swung, the pinch plate 4 pivoted to the cantilever 2 has a certain acceleration under the driving of the cantilever 2, the cantilever 2 impacts behind the limit shaft 3, the pinch plate 4 overcomes the torsion of the torsion spring by means of inertia to continuously swing and rotates relative to the cantilever 2, so that when the cantilever 2 impacts and rebounds, the pinch plate 4 abuts against the periphery of the limit shaft 3 to stop the rebounding of the cantilever 2, and the arc reignition is avoided. Then, after the impact resilience of the cantilever 2 is finished, the pinch plate 4 on the cantilever 2 can be reset through the elastic force of the torsion spring, and the pinch plate 4 does not conflict with and interfere with the limiting shaft 3 any more, so that the subsequent reclosing operation of the cantilever 2 is prevented.

However, the anti-rebounding mechanism with the structure is greatly influenced by the torsion spring, if the elasticity coefficient of the torsion spring is too high (the torsion spring is too tight), the torsion of the torsion spring with the too high elasticity coefficient cannot be overcome by the inertial whipping of the buckle plate 4, and a sufficient swinging angle cannot be whipped easily, so that the anti-rebounding function is invalid; if the elastic coefficient of the torsion spring is too low (the torsion spring is too loose), the pinch plate 4 is not restored in time, so that the subsequent reclosing process of the cantilever 2 is limited. Therefore, when a product is produced, adjustment and replacement of the torsion spring are often required for many times, but the dismounting process of the torsion spring is complex, and the production efficiency is influenced.

For the above, some anti-rebound mechanisms select a stop lever fixed on one side of the main shaft 1, and the buckle plate is made into an extended part extending outwards, and the stop lever is used to stop the extended part to push the buckle plate to rotate, so that the buckle plate has a certain swing angle before overcoming the torsion of the torsion spring. However, in this structure, the stopper rod is abutted against one side plane of the sheet-shaped buckle plate, the tolerance gap between the stopper rod and the sheet-shaped buckle plate is small, and the position of the stopper rod is not adjustable, so that in order to take the resetting performance of the buckle plate into consideration, the manufacturing and matching precision of the stopper rod and the extending part has higher requirements, and the adjustment in the product assembling process is not facilitated.

SUMMERY OF THE UTILITY MODEL

Therefore, in order to solve the above problems, the present invention provides a rebound prevention mechanism of a circuit breaker with an optimized structure and a circuit breaker.

The utility model is realized by adopting the following technical scheme:

the utility model provides an anti-rebound mechanism of a circuit breaker, which comprises a cantilever, a limiting shaft, a buckle plate and an elastic element, wherein the cantilever and a main shaft synchronously rotate, and realize switching-on and switching-off through a swinging stroke, the buckle plate is pivoted on the cantilever and can swing in a positive direction or a reverse direction relative to the cantilever, the elastic element provides elastic force for the buckle plate to swing in the reverse direction relative to the cantilever, and the elastic element is matched with the limiting shaft to realize the anti-rebound function, and the anti-rebound mechanism is characterized in that: still support the piece including pressing, press to support the piece including being used for rather than the fixed about end, a slender pole is connected to about end, about end is fixed to be set up and is skew one side of main shaft, the slender pole extends between main shaft and the spacing axle towards, the end of slender pole is for being used for pressing to support the end is supported to the pressure of buckle, the buckle is being close to it has the recess to open on one side of main shaft, when cantilever carries out its wobbling intermediate process that divides the floodgate, press to support the end can press to on the recess, thereby promote elastic element's elastic force is overcome the buckle is relative the cantilever produces the forward swing of certain angle in advance, thereby ensures the buckle can have the forward swing angle that accords with the requirement of preventing kick-backing function.

In order to avoid the blocking of the pressing part from affecting the reverse swing reset of the pinch plate, in one embodiment, the pressing end is preferably in a bundled convex structure, and a clearance space for the reverse swing reset of the pinch plate is formed between the bundled pressing end and the groove.

In order to increase the tolerance gap between the buckle plate and the pressing member, in one embodiment, the pressing end is preferably an arc surface, and the groove is an arc groove.

In order to adjust the position of the pressing end, in one embodiment, the restraining end is preferably fixedly arranged in a detachable connection manner.

In order to adjust the position of the pressing end, in one embodiment, it is preferable that the restraining end is fixed by a bolt, and the bolt is loosened to swing the pressing member to adjust the position of the pressing end.

Based on installation and manufacturing considerations, the constraint end is preferably of a square structure for a bolt to penetrate and fix, and the constraint end, the slender rod and the pressing end are connected together, so that the pressing piece is in a square shape.

Wherein, for installation and manufacturing considerations, it is preferred that the resilient element is a torsion spring, one arm of which acts on the cantilever and the other arm of which acts on the pinch plate.

Based on the anti-rebound mechanism of the circuit breaker, the utility model also provides the circuit breaker, which is provided with the anti-rebound mechanism of the circuit breaker.

Preferably, this circuit breaker is universal circuit breaker, including the curb plate, spacing axle and the piece fixed connection that supports of pressing are in on the curb plate, main shaft rotatable coupling be in on the curb plate.

The utility model has the following beneficial effects: the utility model is provided with the pressing part, and the pressing part further helps the pinch plate to overcome the elastic force of the torsion spring and swing in the positive direction relative to the cantilever. Before the buckle relies on inertia to carry out its forward swing promptly, earlier support through the pressure of pressing and make the buckle have the swing in advance of certain angle, after guaranteeing that the buckle is again through inertial forward swing, the forward swing angle of buckle is enough to realize preventing the resilience function, improved the reliability and the stability of preventing the resilience mechanism by a wide margin, and because press to support can assist the buckle to overcome the elastic force of torsional spring, consequently can adopt the higher torsional spring of coefficient of elasticity, can guarantee the forward swing of buckle, can guarantee the reverse reset of buckle again, the loaded down with trivial details torsional spring correction work has been saved. Moreover, the slender rod of the pressing part extends towards the position between the main shaft and the limiting shaft and abuts against the groove of the buckle plate, and the pressing effect of the buckle plate can be realized without redesigning the appearance of the buckle plate; the slender rod pressing end of the arc surface is matched with the arc-shaped groove, so that a larger tolerance error is caused between the pressing piece and the buckle plate, and the resetting performance of the buckle plate is ensured; the pressing and supporting piece is also detachably connected, so that the position of the pressing and supporting piece can be conveniently adjusted, and the adjustment work in the product installation process is facilitated.

Drawings

Fig. 1 is a schematic view of a rebound prevention mechanism in the prior art (closed state);

FIG. 2 is a schematic view of a prior art anti-rebound mechanism (the condition of rebound of a cantilever impact after opening);

fig. 3 is a schematic view (front view) of the conventional circuit breaker in the embodiment;

fig. 4 is a schematic view (top view) of the conventional circuit breaker in the embodiment;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 3;

FIG. 6 is an exploded view of the structure of the anti-rebound mechanism in the embodiment;

FIG. 7 is a schematic diagram of the anti-rebounding mechanism in the closing state in the embodiment;

FIG. 8 is a schematic view of the pressing member pressing against the buckle plate when the anti-rebound mechanism is opened in the embodiment;

FIG. 9 is a schematic diagram of the anti-rebound mechanism in the embodiment, when the anti-rebound mechanism is opened, the cantilever impacts on the limiting shaft;

FIG. 10 is a schematic diagram of the embodiment in which the cantilever rebounds due to impact and the buckle plate abuts against the limiting shaft;

FIG. 11 is a schematic view of the clip and the pressing member in the embodiment.

Detailed Description

To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The utility model will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 3 to 6, as a preferred embodiment of the present invention, a universal circuit breaker is provided, which includes an anti-rebound mechanism, where the anti-rebound mechanism includes a cantilever 2, a limit shaft 3 and a buckle 4, a main shaft 1 of the universal circuit breaker is rotatably connected to a side plate 5 of the universal circuit breaker, and the cantilever 2 is fixedly connected to the main shaft 1 and swings with the rotation of the main shaft 1 to realize the opening and closing of the circuit breaker. The limit shaft 3 is fixedly arranged on the opening swing path of the cantilever 2 to block and limit the cantilever 2, so that the limit position of the opening of the circuit breaker is defined, and when the cantilever 2 impacts on the limit shaft 3, most of kinetic energy is not absorbed, and the cantilever 2 rebounds reversely. The buckle 4 for preventing the boom 2 from rebounding is pivotally connected to the boom 2 and has a pivot point a about which the buckle 4 can swing with respect to the boom 2. A torsion spring is assembled on a pivot shaft of the pinch plate 4, one torsion arm of the torsion spring acts on the cantilever 2, the other torsion arm acts on the pinch plate 4, the rotation of the pinch plate 4 relative to the cantilever 2 is limited through the torsion spring, and the restoring force for enabling the pinch plate 4 to rotate and reset is provided.

In particular, referring to fig. 7-10, the present embodiment further comprises a pressing member 6, the pressing member 6 is also fixedly disposed, i.e. will not move along with the movement of the main shaft 1, the cantilever 2, and the buckle 4, and the fixing manner of the pressing member 6 and the limiting shaft 3 can be similar or identical, e.g. they can be fixedly connected to the side plate 5 by screwing or welding or riveting.

The operation of the embodiment to achieve the anti-rebound function is described in detail below, with reference to fig. 7-10 in sequence:

1. when the cantilever 2 moves from a closing state to an opening state, namely the cantilever 2 performs the opening stroke, the buckle plate 4 firstly follows the swing of the cantilever 2, in the swing process of the cantilever 2 and the buckle plate 4, the pressing piece 6 presses the buckle plate 4 (figure 8) and pushes the buckle plate 4 to overcome the elastic force of the torsion spring and swing forwards towards the direction R1 relative to the cantilever 2 (the directions R1 and R2 in the figure refer to the forward and reverse swing directions of the buckle plate 4 relative to the cantilever 2), and when the cantilever 2 impacts the limiting shaft 3 (figure 9), the buckle plate 4 further overcomes the elastic force of the torsion spring and swings forwards relative to the cantilever 2 towards the direction R1 by means of inertia; so that in the state shown in fig. 9, the height of the lower end of the pinch plate 4 is lower than that of the upper end of the limiting shaft;

2. when the cantilever 2 rebounds due to hitting the limit shaft 3 (fig. 10), the buckle plate 4, which swings in the forward direction and becomes lower in position, can abut against the limit shaft 3 to stop the rebound of the cantilever 2. Finally, the cantilever 2 finishes rebounding and then statically abuts against the limiting shaft 3, and the buckle plate 4 swings reversely towards the direction R2 relative to the cantilever 2 under the action of the elastic force of the torsion spring to reset so as to break away from the collision with the limiting shaft 3, so that the effect of reclosing of the cantilever 2 is avoided.

In this embodiment, since the pressing member 6 is fixedly disposed, the pressing member 6 further assists the buckle plate 4 to overcome the elastic force of the torsion spring and swing forward relative to the cantilever 2. Before buckle 4 relies on inertia to carry out its forward swing promptly, earlier support through the pressure that supports 6 and make buckle 4 have the swing in advance of certain angle, after ensuring buckle 4 again through inertial forward swing, buckle 4's forward swing angle is enough to realize preventing the resilience function, make buckle 4 in 2 minute brake motion processes of cantilever relative cantilever 2 forward swing very reliable, even the elastic coefficient of torsional spring is higher, support under the pressure that supports 6 and also can realize the swing of relative cantilever 2 of buckle 4, consequently improved the reliability and the stability of preventing the resilience mechanism by a wide margin. And because the pressing part 6 can assist the pinch plate 4 to overcome the elastic force of the torsion spring, the torsion spring with higher elastic coefficient can be adopted, the forward swing of the pinch plate 4 can be ensured, the reverse reset of the pinch plate 4 can be ensured, and the complex torsion spring correction work is omitted.

Referring to fig. 11, in the prior art pinch plate 4 structure, a groove 41 is usually formed on a side close to the spindle 1 to avoid the pinch plate 4 from the spindle 1. In order to produce the swing of pressing in advance to buckle 4 on current buckle 4's structure basis, in this embodiment, press and support 6 specifically including being used for pressing to support the restraint end 61 that 6 is fixed, a slender pole 63 is connected to restraint end 61, the end of slender pole 63 is for being used for pressing to support the end 62 of pressing of buckle 4, restraint end 61 is fixed to be set up in the one side of deviating main shaft 1, slender pole 63 extends between main shaft 1 and the spacing axle 3 towards main shaft 1, the wobbling process of buckle 4, thereby press to support end 62 and press to realize supporting the pressure of buckle 4 in recess 41. Under the structure of the pressing piece 6 of the embodiment, the pressing effect of the buckle plate 4 can be realized without redesigning the appearance of the buckle plate 4, and the manufacturing cost is saved. Moreover, the end 62 is pressed to be the bulge column structure of binding up, thereby the end 62 is pressed to support through the pressure of binding up and realize supporting to buckle 4 in recess 41 for when buckle 4 contradicts on spacing axle 3, press to have formed the clearance space G that supplies buckle 4 reverse swing to reset between end 62 and the recess 41, this embodiment has still utilized the characteristic that buckle 4 has recess 41 promptly, has guaranteed that buckle 4 has the space that sufficient reverse swing resets. Furthermore, the pressing end 62 is an arc surface, the groove 41 is an arc groove, and the fit between the arc surface and the arc groove has a larger tolerance gap, which is enough to ensure that the buckle plate 4 can be reliably reset even if the pressing piece 6 or the buckle plate 4 has certain assembly or manufacturing errors.

In this embodiment, the restraining end 61 is a square structure for the bolt to penetrate and fix, and the restraining end 61 is connected with the elongated rod 63 and the pressing end 62, so that the pressing member 6 is a q-shaped structure. The pressing member 6 is fixed to the side plate 5 by bolting the restraining end 61, thereby facilitating the connection and fixation of the pressing member 6. Of course, in addition to the fastening by bolts, the pressing member 6 may be fastened by clamping, welding, or bonding, and the connecting portion (corresponding to the restraining end 61 in the shape of a square in the present embodiment) of the pressing member 6 may be flexibly arranged according to the fastening technique actually used. But preferably a detachable connection is used to fix the pressing member 6 so as to adjust the specific position of the pressing end 62 of the pressing member 6. Especially, under the condition of adopting the bolt connection, the fixing bolt is unscrewed, the pressing part 6 is similar to a swing rod, and the position of the pressing end 62 of the pressing part 6 can be conveniently adjusted, so that the calibration and debugging in the production process are facilitated.

Although the most conventional torsion spring is used as the elastic element for restricting the buckling plate 4 from swinging relative to the cantilever 2 in the present embodiment, it is obvious that in other embodiments, another elastic element may be used instead of the torsion spring, such as a tension spring, with one end connected to the restricting buckling plate 4 and the other end connected to the cantilever 2.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (9)

1. The anti-rebound mechanism of the circuit breaker comprises a cantilever, a limiting shaft, a buckle plate and an elastic element, wherein the cantilever and a main shaft synchronously rotate, and realize switching-off and switching-on through a swing stroke, the buckle plate is pivoted on the cantilever and can be relatively the cantilever forwards or reversely swings, the elastic element provides the buckle plate which is relative to the elastic force of the cantilever reversely swings and cooperates the limiting shaft to realize the anti-rebound function, and is characterized in that: still support the piece including pressing, press to support the piece including being used for rather than the fixed about end, a slender pole is connected to about end, about end is fixed to be set up and is skew one side of main shaft, the slender pole extends between main shaft and the spacing axle towards, the end of slender pole is for being used for pressing to support the end is supported to the pressure of buckle, the buckle is being close to it has the recess to open on one side of main shaft, when cantilever carries out its wobbling intermediate process that divides the floodgate, press to support the end can press to on the recess, thereby promote elastic element's elastic force is overcome the buckle is relative the cantilever produces the forward swing of certain angle in advance, thereby ensures the buckle can have the forward swing angle that accords with the requirement of preventing kick-backing function.

2. The antirebound mechanism of circuit breaker of claim 1, wherein: the pressing and abutting ends are of a contracted convex structure, and a clearance space for the buckle plate to reversely swing and reset is formed between the contracted pressing and abutting ends and the grooves.

3. The anti-rebound mechanism for a circuit breaker according to claim 2, wherein: the pressing end is an arc surface, and the groove is an arc groove.

4. The antirebound mechanism of circuit breaker of claim 1, wherein: the constraint end is fixedly arranged in a detachable connection mode.

5. The anti-rebound mechanism for a circuit breaker according to claim 4, wherein: the restraining end is fixedly connected through a bolt, and the bolt is loosened to swing the pressing piece so as to adjust the position of the pressing end.

6. The antirebound mechanism of circuit breaker of claim 5, wherein: the restraining end is of a square structure for the bolt to penetrate and fix, and the restraining end, the slender rod and the pressing end are connected, so that the pressing piece is in a square shape.

7. The antirebound mechanism of circuit breaker of claim 1, wherein: the elastic element is a torsion spring, one arm of the torsion spring acts on the cantilever, and the other arm of the torsion spring acts on the pinch plate.

8. The circuit breaker, its characterized in that: the circuit breaker has an anti-rebound mechanism of the circuit breaker as claimed in any one of claims 1 to 7.

9. The circuit breaker of claim 8, wherein: the circuit breaker is universal circuit breaker, including the curb plate, spacing axle with press to support a fixed connection in on the curb plate, main shaft rotatable coupling be in on the curb plate.

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