The invention discloses an asynchronous switching device and an arc absorption method. The asynchronous switch device comprises a main switch branch, an arc absorption branch and a moving contact group, wherein the main switch branch comprises a main switch contact, the arc absorption branch comprises an arc absorption contact and an instantaneous current absorption device, and the moving contact group comprises a main contact and an auxiliary contact; The connection and separation of the main switch contact and the main contact make the main switch branch work in two states, and the connection and separation of the arc-absorbing contact and the auxiliary contact make the arc-absorbing branch work in two states. The arc absorption method includes the following steps: when the asynchronous switching device is turned off, first separate the main switch contact from the main contact, and then separate the arc absorption contact from the auxiliary contact. The switch device and method of that invention can effectively inhibit arc sparks generate in the use process of the switch circuit, and have high safety, good stability and low production cost. The invention can be widely applied to various circuit switching systems.
The patent describes an asynchronous switching device with arc absorption function and an arc absorption method.
Technical field
[000 1] The present invention relates to an arc extinguishing or arc prevention device between current-carrying parts, and more specifically, to a switching device with an arc absorption function and an arc absorption method.
technical background
[0002] Arc is a gas discharge phenomenon, which is an instantaneous spark generated when current passes through some insulating medium (such as air). When the current is cut off by a switching appliance, if the circuit voltage and current are too high, an arc will occur between the contacts of the appliance. The high heat generated by arc melts the contact surface and forms "burr", which is easy to damage the contact and shorten the service life of the switch. When the arc is serious, it will burn out the contacts and even make the whole circuit system out of control, resulting in greater unexpected losses.
[0003] In the prior art, arc extinguishing covers are commonly used to suppress electric arcs. Arc extinguishing cover is a common device installed near the path around the arc, which is used to guide the arc into the arc extinguishing cover, reduce the time when the arc stays on the contact, reduce the arc temperature, and thus accelerate the arc extinguishing. First of all, the arc-extinguishing cover is affected by the high temperature of the arc, so there are certain requirements for the material of the arc-extinguishing cover, and its manufacturing cost is high, and the arc-extinguishing cover is easy to burn out; Secondly, in order to ensure the insulation safety, the arc extinguishing cover should not be too close to the electrode contact or conductor, which will lead to the discharge arc not necessarily being absorbed by the arc extinguishing cover, making the arc extinguishing cover easy to fail; Thirdly, because the function of the arc-extinguishing cover is not to extinguish the arc, but to guide the arc into the arc-extinguishing cover as much as possible to reduce the time of maintaining the arc at the contact, its arc-extinguishing effect is often not ideal.