CN213845201U - Magnetic arc blowing device of direct current quick circuit breaker - Google Patents

Abstract

The utility model discloses a magnetic arc-blowing device of a direct current quick breaker, which comprises a static contact and a moving contact, wherein the upper end of the moving contact is hinged with a movable contact plate, a first spring is arranged below the movable contact plate, the upper surface of the movable contact plate is provided with a guide slope, and a limit rod abutted against the guide slope is arranged above the guide slope; one side of the moving contact facing the static contact is provided with a moving contact group; the static contact plate is arranged above the static contact plate, the first iron core is arranged above the static contact plate, magnetic conducting rods are arranged at two ends of the first iron core, end portions of the magnetic conducting rods extend to two sides of a gap between the movable contact plate and the static contact plate, the plastic guide columns are arranged below the first iron core and are slidably inserted into the static contact, the lower ends of the plastic guide columns are fixedly connected with the second iron core, second springs respectively connected with the second iron core and the static contact are sleeved on the plastic guide columns, wires are wound on the first iron core and the second iron core, one ends of the wires are electrically connected with the static contact plate, the other ends of the wires are electrically connected with the static contact, and permanent magnets are arranged below the second iron core. The problem of electricity waste of the magnetic arc blowing device is effectively solved through the mechanism.

Description

Magnetic arc blowing device of direct current quick circuit breaker

Technical Field

The utility model relates to an arc-blowing device, especially a direct current quick circuit breaker's magnetism arc-blowing device.

Background

A direct current quick breaker is a direct current breaker which has short breaking time enough to break before the short-circuit current reaches the maximum value. Generally, strong short circuit electric repulsion is utilized to directly push the contact open, so that the action time of the mechanism is only 2-3 milliseconds, and a good arc extinguish chamber is added, so that the current limiting performance is good. The method is widely applied to protecting high-power direct-current electric equipment such as a silicon rectifying device and the like. In the use, in order to promote the arc extinguishing effect, often will install the arc-blowing device in the explosion chamber. Most of the existing arc blowing devices are magnetic arc blowing type. The arc blowing device in the form is stable in working state and high in efficiency, and can play a good role in auxiliary arc extinguishing. However, during use, the magnetic arc-blowing device needs to be continuously powered, so that the waste of electric energy is serious and the magnet exciting coil is easy to be blown out due to an overheat state. In addition, current magnetism arc-blowing device is fixed motionless in the explosion chamber, and when electric arc kept away from magnetism arc-blowing device gradually, magnetism arc-blowing device weakens to the arc-blowing effect of electric arc gradually, and then has reduced the arc-blowing effect to distal end electric arc.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide a magnetic arc-blowing device for a dc fast breaker, which can realize the following arc-blowing effect to the arc and the excitation arc-blowing only when the arc is generated.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a magnetic arc blowing device of a direct current quick circuit breaker comprises a fixed contact and a movable contact, wherein the upper end of the movable contact is hinged with a movable contact plate, a first spring for driving the movable contact plate to turn upwards is arranged below the movable contact plate, a triangular guide slope is arranged on the upper surface of the movable contact plate, and a limiting rod abutted against the guide slope is arranged above the guide slope; one side of the moving contact facing the static contact is provided with a moving contact group; the static contact is arranged above the static contact, the first iron core is arranged above the static contact, magnetic conducting rods are arranged at two ends of the first iron core, end portions of the magnetic conducting rods extend to two sides of a gap between the movable contact and the static contact, a plastic guide pillar is arranged below the first iron core, the plastic guide pillar is longitudinally arranged and is slidably inserted into the static contact, the lower end of the plastic guide pillar penetrates through the static contact and then is fixedly connected with the second iron core, a second spring is sleeved on the plastic guide pillar, two ends of the second spring are fixedly connected with the static contact and the second iron core respectively to support the first iron core, wires are wound on the first iron core and the second iron core, one end of each wire is electrically connected with the static contact, the other end of each wire is electrically connected with the static contact, and a permanent magnet is arranged below the second iron core.

Furthermore, the movable contact group comprises a guide tube arranged towards the fixed contact, an electrode column capable of moving along the axial direction of the guide tube is slidably arranged in the guide tube, and a third spring is axially arranged in the guide tube and is in a compressed state to apply an outward acting force to the electrode column.

The working principle is as follows: when the working circuit is normal, the moving contact and the static contact are in a closing state, the current passes through the moving contact and the static contact, at the moment, the movable contact plate is not in contact with the static contact plate, and the magnetic arc blowing device is not activated. When the working circuit is abnormal, the moving contact and the fixed contact are tripped. The trip step can be divided into three steps. 1. The moving contact is turned towards the direction far away from the static contact under the action of the tripping mechanism, and the moving contact and the static contact are still in a connection state due to the action of the moving contact group. Meanwhile, the movable contact plate is pulled by the overturned moving contact to move to one side far away from the static contact plate, the guide slope on the upper surface of the movable contact plate is pressed by the limiting rod in the moving process, so that the movable contact plate is in contact with the static contact plate, the magnetic arc blowing device is conducted to work at the moment to generate an arc blowing magnetic field, and the second iron core also generates magnetism due to the action of the magnetic field. It should be noted that the same poles of the magnetic force and the lower permanent magnet repel each other, so that the second iron core can drive the first iron core and the magnetic conducting rod to ascend synchronously. The duration of this state is very short, about (0.3 to 0.5 s). And 2, after the moving contact is overturned to a certain degree, the movable contact group extends out to the limit and is disconnected with the static contact, and at the moment, the movable contact plate and the static contact plate are still in a connection state due to the action of the guide slope. At this time, the current flows through the movable contact plate and the stationary contact plate, so that no arc occurs. The state duration is also short, about (0.3-0.5 s). 3. With the further overturn of the moving contact, the movable contact plate is disconnected with the fixed contact plate at the moment, electric arcs are generated, and the electric arcs move towards the arc extinguishing grid piece under the action of the magnetic field of the magnetic arc blowing device. Thereby completing the arc blowing work. In the arc blowing process, the second iron core has the mutual action of side magnetism and the permanent magnet, the second iron core overcomes the damping of the second spring, the magnetic conducting rod slowly rises, and the arc blowing effect of the magnetic field at the magnetic conducting rod on the arc can be further improved in the rising process.

Drawings

Fig. 1 is a schematic diagram of the state of the utility model during closing;

fig. 2 is a schematic diagram of the instant state of tripping of the present invention;

fig. 3 is a schematic diagram of the state of the utility model after tripping is completed;

fig. 4 is a schematic view of the state of the present invention when an arc is generated.

Reference numerals: 1. the static contact 2, the moving contact 3, the movable contact plate 4, the first spring 5, the guide slope 6, the limiting rod 7, the movable contact 7a, the guide tube 7b, the electrode post 7c, the third spring 8, the static contact plate 9, the first iron core 10, the magnetic conduction rod 11, the plastic guide post 12, the second iron core 13, the second spring 14, the lead 15 and the permanent magnet.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 to 4, the magnetic arc-blowing device of the dc fast breaker includes a static contact 1 and a moving contact 2. The moving contact can be connected with and disconnected from the fixed contact through a closing mechanism (not shown in the figure) and a tripping mechanism (not shown in the figure). The upper end of the moving contact is provided with a movable contact plate 3 hinged with the moving contact, a first spring 4 is arranged below the movable contact plate, and the first spring is in a compressed state so that the movable contact plate has a tendency of turning upwards. In addition, a triangular guide slope 5 is arranged on the upper surface of the movable touch plate. Meanwhile, a limiting rod 6 is arranged above the movable touch plate and is pressed against the inclined surface of the guide slope. In addition, a movable contact group 7 is arranged on one side of the movable contact facing the static contact, and the movable contact group has a telescopic function and can prolong the contact time of the movable contact and the static contact when the movable contact is tripped for a short time. And a static contact plate 8 is arranged above the static contact, a first iron core 9 is arranged above the static contact plate, two ends of the first iron core are symmetrically connected with two magnetic conducting rods 10, and one end of each magnetic conducting rod extends to two sides of a gap between the movable contact plate and the static contact plate. And a plastic guide post 11 which is longitudinally arranged and is inserted into the static contact in a sliding fit manner is fixedly connected below the first iron core, and a second iron core 12 is fixedly connected below the plastic guide post. It should be noted that, in order to maintain the position of the first iron core, a second spring 13 is sleeved on the plastic guide pillar, an upper end of the second spring is fixedly connected with the stationary contact, and a lower end of the second spring is fixedly connected with the second iron core. So that the second spring has an upward pulling force on the second iron core. In addition, a wire 14 is wound on the first iron core and the second iron core, one end of the wire is electrically connected with the static contact plate, and the other end of the wire is electrically connected with the static contact. And a permanent magnet 15 is disposed below the second core. When the conducting wire is electrified, the first iron core and the second iron core respectively generate magnetic fields. The magnetic field of the first iron core is conducted by the magnetic conducting rod and then acts between the movable contact plate and the static contact plate, so that the electric arc generated between the movable contact plate and the static contact plate moves upwards under the action of the magnetic field. The magnetic field generated by the second iron core is repelled with the magnetic pole of the permanent magnet, and the first iron core is driven to ascend by overcoming the damping action of the spring.

As a further improvement of the above embodiment, the specific structure of the movable contact group 7 includes a guide tube 7a disposed toward the side of the stationary contact, and an electrode post 7b is disposed in the guide tube in a sliding fit manner. At the same time, a third spring 7c is also arranged in the conduit. When the moving contact and the static contact are switched on, the third spring is in a compressed state and the electrode column retracts into the guide tube.

Claims (2)

1. The utility model provides a direct current quick circuit breaker's magnetic arc-blowing device which characterized in that: the movable contact comprises a fixed contact and a movable contact, wherein the upper end of the movable contact is hinged with a movable contact plate, a first spring for driving the movable contact plate to turn upwards is arranged below the movable contact plate, a triangular guide slope is arranged on the upper surface of the movable contact plate, and a limiting rod abutted against the guide slope is arranged above the guide slope; one side of the moving contact facing the static contact is provided with a moving contact group; the static contact is arranged above the static contact, the first iron core is arranged above the static contact, magnetic conducting rods are arranged at two ends of the first iron core, end portions of the magnetic conducting rods extend to two sides of a gap between the movable contact and the static contact, a plastic guide pillar is arranged below the first iron core, the plastic guide pillar is longitudinally arranged and is slidably inserted into the static contact, the lower end of the plastic guide pillar penetrates through the static contact and then is fixedly connected with the second iron core, a second spring is sleeved on the plastic guide pillar, two ends of the second spring are fixedly connected with the static contact and the second iron core respectively to support the first iron core, wires are wound on the first iron core and the second iron core, one end of each wire is electrically connected with the static contact, the other end of each wire is electrically connected with the static contact, and a permanent magnet is arranged below the second iron core.

2. A magnetic arc-blowing apparatus of a direct current quick circuit breaker according to claim 1, wherein: the movable contact group comprises a guide pipe arranged towards the static contact, an electrode column capable of moving along the axial direction of the guide pipe is arranged in the guide pipe in a sliding mode, a third spring is further axially arranged in the guide pipe, and the third spring is in a compressed state and exerts an outward acting force on the electrode column.

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