CN220627721U - Conductive loop structure and circuit breaker - Google Patents

Abstract

The utility model relates to the field of low-voltage appliances, in particular to a conductive loop structure and a circuit breaker, wherein the conductive loop structure comprises an incoming wire connecting terminal and an outgoing wire connecting terminal which are oppositely arranged, a connecting seat is arranged on the incoming wire connecting terminal, a moving contact guide rod is rotatably arranged on the connecting seat, a moving contact silver point is arranged on the surface of the moving contact guide rod, which faces the incoming wire connecting terminal, a conductive arm is arranged on the outgoing wire connecting terminal, the front part of an end automatic contact guide rod of the conductive arm bypasses the side part of the moving contact guide rod and then extends to the rear part of the moving contact guide rod, a fixed contact silver point is arranged on the surface of the end, which faces the outgoing wire connecting terminal, and the fixed contact silver point and the moving contact silver point are in matched touch in a closing state; in the opening state, an electric arc is generated in the enclosing area of the moving contact guide rod and the conductive arm, a magnetic field formed by current passing through the moving contact guide rod generates vertical thrust to the generated electric arc, and a magnetic field formed by current passing through the side surface section of the conductive arm generates horizontal thrust to the generated electric arc.

Description

Conductive loop structure and circuit breaker

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to a conductive loop structure and a circuit breaker.

Background

With the gradual increase of the capacity of the low-voltage power supply system, the requirements on the breaking capacity of the low-voltage circuit breaker are higher, new energy application occasions are more and more, and the use of the direct-current rated voltage 1500V power distribution system is more and more extensive.

At present, the conductive part of the plastic shell low-voltage circuit breaker consists of a contact system and a tripping system, wherein the contact system comprises a fixed contact and a moving contact which are correspondingly connected with an incoming wire connecting terminal and an outgoing wire connecting terminal. In the application, besides normal load rated current, the circuit breaker also needs to break abnormal fault current, and an electric arc can be generated in the breaking process of a movable contact and a static contact, so that the electric arc temperature is extremely high, and a current-carrying part of the circuit breaker can be burnt or even burnt for a long time. Therefore, improving the elongation, cooling and extinguishing ability of the arc has been an important means for pursuing high breaking ability in the field of the piezoelectric devices.

As shown in fig. 1, a moving contact and a fixed contact of the conventional circuit breaker often adopt a front breaking mode, namely, silver points of the two contacts are positioned on the front of the contacts, when the two contacts are close to each other, the two contacts are far away from the time division switch, and when the two contacts are close to each other, a current flows from a moving contact guide rod 1 'and a moving contact silver point 2' to a fixed contact silver point 3 'and a fixed contact conductive sheet 4', so as to form a conductive loop; when the switch is opened, the movable contact silver point 2 'is far away from the fixed contact silver point 3' and the electric arc 5 'is pulled out, and the electric arc is extinguished by matching with an arc extinguishing mechanism below the electric arc 5'.

The structure is characterized in that the motion is direct, the structure is simple, but the generated electric arc needs to be extinguished by depending on the arc extinguishing chamber, and the moving contact is assisted to be separated by the rapid repulsion opening mechanism, so that the aim of rapid arc extinguishing and breaking is fulfilled.

Disclosure of Invention

Based on the above problems, the utility model aims to provide a conductive loop structure and a circuit breaker, which further accelerate the dissipation and extinction of an electric arc and improve the arc extinguishing capability and breaking capability of the circuit breaker.

In order to achieve the above purpose, on one hand, the present utility model adopts the following technical scheme:

the utility model provides a conductive loop structure, it includes the inlet wire binding post and the outlet wire binding post of opposition setting, be provided with the connecting seat on the inlet wire binding post, rotate on the connecting seat and be provided with the moving contact guide arm, be provided with the moving contact silver point on the face of moving contact guide arm towards inlet wire binding post, be provided with the conducting arm on the outlet wire binding post, the place ahead of the automatic contact guide arm of end of conducting arm walks around the side of moving contact guide arm and extends to the rear of moving contact guide arm again, and be provided with the static contact silver point on the face of end towards outlet wire binding post, under the combined floodgate state, the cooperation of static contact silver point and moving contact silver point touches; in the opening state, an electric arc is generated in the enclosing area of the moving contact guide rod and the conductive arm, a magnetic field formed by current passing through the moving contact guide rod generates vertical thrust to the generated electric arc, and a magnetic field formed by current passing through the side surface section of the conductive arm generates horizontal thrust to the generated electric arc.

Optionally, the surrounding area of the moving contact guide rod and the conductive arm is a semi-surrounding structure with a lower opening and a side opening, the electric arc is elongated by vertical thrust towards the lower opening and by horizontal thrust towards the side opening.

Optionally, in the closing state, the moving contact guide rod is in an upright state perpendicular to the horizontal plane.

Optionally, the device further comprises an insulating baffle, wherein the insulating baffle is attached to the inner side face of the conductive arm, and an installation step for forming a bearing for the conductive arm is arranged on the insulating baffle.

In summary, the conductive loop structure changes the front breaking mode of the conventional moving contact and the fixed contact into the back breaking mode, so that the current conduction direction is changed, and the magnetic field of the current is utilized to generate acting forces in two directions on the electric arc, so that the electric arc is lengthened, and the dissipation and extinction of the electric arc are accelerated.

On the other hand, the utility model adopts the following technical scheme:

the circuit breaker comprises an operating mechanism, a tripping mechanism, an arc extinguishing mechanism and the conductive loop structure, wherein the operating mechanism comprises a linkage rod, and the linkage rod is connected with a moving contact guide rod of the conductive loop structure and is used for driving the moving contact guide rod to perform switching-on and switching-off actions; the tripping mechanism is arranged on the outgoing line wiring terminal of the conductive loop structure; the arc extinguishing mechanism is arranged below the conductive loop structure and is used for extinguishing an arc.

In conclusion, the circuit breaker can improve the arc extinguishing effect through the angle of the driven and fixed contacts through the conductive loop structure, and further improves the breaking capacity of the circuit breaker.

Drawings

Fig. 1 is a schematic diagram of a conductive circuit in which a movable contact and a fixed contact are in a front breaking form in a conventional circuit breaker;

FIG. 2 is a schematic diagram of a conductive loop according to an embodiment of the present utility model;

fig. 3 is a schematic diagram of the operation of the conductive loop according to the embodiment of the present utility model;

FIG. 4 is a schematic diagram of an insulation device in a conductive loop according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of current and electromagnetic force in a conductive loop according to an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a circuit breaker according to an embodiment of the present utility model.

In the figure:

1', a movable contact guide rod; 2', moving contact silver points; 3', silver points of static contacts; 4 ', static contact conducting strip, 5' and electric arc;

100. a conductive loop structure; 101. a wire inlet wiring terminal; 102. an outgoing line wiring terminal; 103. a connecting seat; 104. a moving contact guide rod; 105. a moving contact silver point; 106. a conductive arm; 107. silver points of the static contact; 108. a rim baffle; 109. Mounting steps;

200. an operating mechanism; 201. A linkage rod;

300. a trip mechanism;

400. an arc extinguishing mechanism.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar parts throughout, or parts having like or similar functions. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, mechanically connected, electrically connected, indirectly connected through an intermediary, or may be in communication with each other between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

Referring to fig. 2 to 4, the present preferred embodiment provides a conductive loop structure 100, which includes an incoming wire connecting terminal 101 and an outgoing wire connecting terminal 102 that are oppositely disposed, a connecting seat 103 is disposed on the incoming wire connecting terminal 101, a moving contact guide rod 104 is rotatably disposed on the connecting seat 103, a moving contact silver point 105 is disposed on a surface of the moving contact guide rod 104 facing the incoming wire connecting terminal 101, a conductive arm 106 is disposed on the outgoing wire connecting terminal 102, a front end of the conductive arm 106 bypasses a side of the moving contact guide rod 104 and extends to a rear of the moving contact guide rod 104, and a static contact silver point 107 is disposed on a surface of the end facing the outgoing wire connecting terminal 102.

In the closing state, the fixed contact silver point 107 and the moving contact silver point 105 are matched and contacted.

In the opening state, an arc is generated in the enclosing area of the moving contact guide rod 104 and the conductive arm 106, a vertical thrust F1 is generated on the generated arc by a magnetic field formed by the current passing through the moving contact guide rod 104, and a transverse thrust F2 is generated on the generated arc by a magnetic field formed by the current passing through the side section of the conductive arm 106.

The specific stress analysis is shown in fig. 5, and according to the principle of right hand rule, the spiral line in the graph is judged to be a magnetic field line by the current direction, and then according to the left hand rule, the electromagnetic force direction is judged by the current direction and the magnetic induction line direction, so that vertical thrust F1 and transverse thrust F2 are generated for the electric arc.

The enclosed area of the moving contact guide rod 104 and the conductive arm 106 is a semi-enclosed structure with a lower opening and a side opening, the electric arc is elongated by the vertical thrust F1 towards the lower opening and elongated by the horizontal thrust F2 towards the side opening, and the electric arc is elongated in two directions and matched with the arc extinguishing mechanism 400 to accelerate arc extinguishing.

In particular, in the closed state, the movable contact guide bar 104 is in an upright state perpendicular to the horizontal plane.

In addition, the conductive loop structure 100 further includes an edge guard 108, the insulating guard 108 is attached to the inner side surface of the conductive arm 106, and a mounting step 109 for forming a bearing for the conductive arm 106 is provided on the insulating guard 108.

On this basis, this embodiment further provides a circuit breaker, see fig. 6 in detail, including operating mechanism 200, tripping mechanism 300, arc extinguishing mechanism 400 and above-mentioned conductive loop structure 100, operating mechanism 200 includes gangbar 201, gangbar 201 is connected with moving contact guide arm 104 of conductive loop structure 100 for drive moving contact guide arm 104 carries out the combined floodgate, breaks off the floodgate action, tripping mechanism 300 sets up on the wire terminal 102 of conductive loop structure 100, arc extinguishing mechanism 400 sets up in conductive loop structure 100's below, is used for extinguishing the electric arc that produces and elongate in the conductive loop structure 100, thereby improve the breaking capacity of circuit breaker.

In summary, the conductive loop structure changes the front breaking mode of the conventional moving contact and the fixed contact into the back breaking mode, so that the current conduction direction is changed, and the magnetic field of the current is utilized to generate acting forces in two directions on the electric arc, so that the electric arc is lengthened, the dissipation and extinction of the electric arc are accelerated, the arc extinguishing effect is improved from the angles of the moving contact and the fixed contact, and the breaking capacity of a circuit breaker adopting the conductive loop structure is improved.

The above embodiments merely illustrate the basic principles and features of the present utility model, and the present utility model is not limited to the above embodiments, but can be variously changed and modified without departing from the spirit and scope of the present utility model, which is within the scope of the present utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (5)

1. The utility model provides a conductive loop structure, its characterized in that includes the inlet wire binding post and the outlet wire binding post of opposition setting, be provided with the connecting seat on the inlet wire binding post, the rotation is provided with the moving contact guide arm on the connecting seat, be provided with the moving contact silver point on the face of moving contact guide arm towards the inlet wire binding post, be provided with the conducting arm on the outlet wire binding post, the end of conducting arm is from the place ahead of moving contact guide arm bypass the side of moving contact guide arm again extends to the rear of moving contact guide arm, and be provided with the static contact silver point on the face of end towards the outlet wire binding post,

in a closing state, the fixed contact silver point and the movable contact silver point are matched and touch;

in the opening state, an electric arc is generated in the enclosing area of the moving contact guide rod and the conductive arm, a magnetic field formed by current passing through the moving contact guide rod generates vertical thrust to the generated electric arc, and a magnetic field formed by current passing through the side surface section of the conductive arm generates transverse thrust to the generated electric arc.

2. The conductive loop structure of claim 1, wherein the enclosed area of the moving contact guide rod and the conductive arm is a semi-enclosed structure with a lower opening and a side opening, the arc is elongated by vertical thrust towards the lower opening and by transverse thrust towards the side opening.

3. The conductive loop structure of claim 1, wherein in the closed state, the moving contact guide bar is in an upright state perpendicular to a horizontal plane.

4. The conductive loop structure of claim 1, further comprising an insulating barrier attached to an inner side of the conductive arm, and wherein the insulating barrier is provided with a mounting step that forms a support for the conductive arm.

5. A circuit breaker comprising an operating mechanism, a trip mechanism, an arc extinguishing mechanism, and a conductive loop structure as recited in any one of claims 1-4, wherein,

the operating mechanism comprises a linkage rod, wherein the linkage rod is connected with a moving contact guide rod of the conductive loop structure and is used for driving the moving contact guide rod to conduct switching-on and switching-off actions;

the tripping mechanism is arranged on an outgoing line wiring terminal of the conductive loop structure;

the arc extinguishing mechanism is arranged below the conductive loop structure and is used for extinguishing an arc.