Direct-current relay

Abstract

The invention provides a direct-current relay, wherein the direct-current relay is used for carrying out arc extinguishing by utilizing lorentz force of a magnetic field of a permanent magnet, beneficial to miniaturization of products and used for extinguishing electric arcs of high direct-current loads with higher arc extinguishing performance. The direct-current relay comprises a relay base anda contact system arranged on the upper side of the relay base, wherein the contact system comprises static contacts and a movable contact which is matched with the static contacts; the movable contactmoves up / down, so that the movable contact is separated from / in contact with the static contacts; the direct-current relay also comprises a permanent magnet matched with the contact system, wherein the magnetic field direction of the permanent magnet is perpendicular to the movement direction of the movable contact; a cover shell is arranged above the contact system, and the cover shell comprisesa temperature reduction chamber; the temperature reduction chamber comprises a temperature reduction chamber inlet; the movable contact is separated from the static contacts to generate an electric arc; and the magnetic field of the permanent magnet enables the electric arc to enter the temperature reduction chamber from the temperature reduction chamber inlet to carry out cooling and extinguishing.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a DC relay, in particular to a DC relay using a magnetic blowing arc extinguishing method. Background technique [0002] In existing DC relays, when extinguishing the arc generated by the separation of dynamic / static contacts, the following methods are often used: [0003] Method 1: Forcibly disconnect the arc by increasing the moving / contact gap; [0004] Method 2: Quickly disconnect the arc by speeding up the action of the moving contact; [0005] No matter which of the above methods is adopted, a larger electromagnetic coil is required to increase the driving power of the product, which is not conducive to the miniaturization of the DC relay, and at the same time, the production cost is also greatly increased. [0006] There is also a type of DC relay. Due to the high DC load (load voltage ≥ 48VDC), the arc cannot be extinguished under normal circumstances. T...

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Problems solved by technology

[0007] However, this type of DC relay has clear requirements on the polarity direction of the current, and the reverse connection will cause the arc to blow to the structural components, or even the DC short circuit of the arc on both sides, resulting in product failure; or the arc is deflected to the current by the Lorentz force of the magnetic field. Vertical direction to avoid component burning or short circuit, and then the arc is disturbed by the concave and convex surface of the shell controlling the direction to extinguish the arc, but the distance of the arc control direction is limited, and the disturbance effect on the arc electric field is also limited , and cannot be adjusted accordingly under different arc intensities, resulting in poor arc extinguishing effect under strong arc conditions

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