Direct-current cut-off unit and direct-current circuit breaker

Abstract

The invention provides a direct-current cut-off unit and a direct-current circuit breaker. The direct-current cut-off unit is provided with an opening and closing part, a handle, a connecting mechanism and an arc extinguishing part, and is characterized by further comprising a guide rail and an expanded shell part, wherein the guide rail is positioned on a bottom surface and is used for mounting the cut-off unit on a panel; the expanded shell part is expanded and formed without influencing the connection of the guide rail through a mounting part of the guide rail; the arc extinguishing part comprises an expanded arc chamber and an arc rolling ring, the expanded arc chamber is mounted inside the expanded shell part, and the arc rolling ring is mounted at the upper part of the arc chamber so as to enable an arc to move towards the expanded arc chamber; the opening and closing part is provided with a movable contact, a fixed contact, a permanent magnet and a solenoid, the permanent magnet is configured at the lower end part of the fixed contact and is of S-N form or N-S form magnetic distribution, and the fixed contact and the movable contact are positioned between two poles of the permanent magnet.

Description

technical field [0001] The invention relates to a DC cut-off unit and a DC circuit breaker. Background technique [0002] A device that passes normal current and cuts off abnormal current is a circuit breaker. The current is divided into AC and DC, and when the DC is connected to the power supply, it has a specified directionality on the positive (+) and negative (-) poles. A general circuit breaker is used in connection with an AC power source and an AC load, and detects abnormal current and cuts it off. Even DC circuit breakers are usually used directly with AC circuit breakers, which is more cost-effective. [0003] In addition, even if an AC circuit breaker is used as a general circuit breaker, it has a certain degree of breaking ability for DC circuits. But when the DC voltage is too large, it is difficult to cut off the higher DC voltage as a general AC circuit breaker. DC current has no current zero point, and if the resulting arc cannot be guided in the specified...

AI Technical Summary

Problems solved by technology

[0010] However, at this time, if image 3 As shown, when the polarities of the magnets of adjacent poles are arranged in the same direction, they can only be connected to the adjacent poles long from top to bottom, and the attachment increases and the length of the wire becomes longer, which leads to the convenience of connecting the circuit on site. reduce, and generate greater waste economically

Additionally, if figure 2 As shown, when the adjacent terminal of the adjacent pole is directly connected, the polarity direction of the magnet can only be reversed. However, at this time, the magnets of opposite polarity are adjacent to each other, so that the magnitude of the force guiding the arc is significantly reduced, and the guiding direction is also changed. changes happened

At this time, it is difficult to guide the arc in the desired direction, which may result in failure of DC cutoff

In addition, due to the size limitation of the casing and solenoid of the existing DC circuit breaker, the size of the arc extinguishing part is also limited, so the maximum capacity of the DC voltage that can be cut off in terms of 1P (one pole or one electrode) structure It's just 250V

[0011] Therefore, only if image 3 Connect the circuit as shown, if as figure 2 As shown, if you want to be directly connected to the adjacent terminal of the adjacent pole, you can only configure it with a farther distance between the magnets.

In addition, due to the limited size of the arc chamber, the capacity that 1P (one pole or one electrode) can cut off is also limited

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