Abstract: Provided is a wireless Bluetooth earphone, which belongs to the field of headphone technology. The wireless Bluetooth earphone comprises a housing, a circuit board, a battery, a connection ring, and a connection terminal. The housing comprises a main housing and a battery housing. The circuit board is arranged in the main housing. The connection ring has a first end and a second end. The first end is connected to one end of the main housing, that is, the first end is connected to one end of the rear housing arranged with an opening. The second end is detachably connected to the battery housing, and the battery is arranged in the battery housing. The connection terminal is arranged in the connection ring. One end of the connection terminal is electrically connected to the circuit board, and the other end of the connection terminal is electrically connected to the battery.

Abstract: An intelligent integrated medium-voltage alternating current (AC) vacuum switchgear based on a flexible switching-closing technology comprises a controller (24), and a vacuum switching tube (1), an insulator (9), and an switching-closing mechanism connecting piece (15), which are connected in sequence. A microprocessor is built in an intelligent circuit (23); a travel sensor is fixed to a movable contact connecting rod (5), and directly detects a motion state of a movable contact (4) and acquires accurate motion parameters of the movable contact (4); switching-closing operating parameters are obtained by comprehensively calculating arc light intensity detected by an arc light transmitter (20) and a temperature measured by an infrared temperature measuring transmitter (22), such that the switching-closing performance of switching on and switching off a medium-voltage power grid is greatly improved, switching-closing time points are accurately controlled, and “flexible” switching-closing is achieved.

Abstract: An intelligent integrated medium-voltage alternating current (AC) vacuum switchgear based on a flexible switching-closing technology comprises a controller (24), and a vacuum switching tube (1), an insulator (9), and an switching-closing mechanism connecting piece (15), which are connected in sequence. A microprocessor is built in an intelligent circuit (23); a travel sensor is fixed to a movable contact connecting rod (5), and directly detects a motion state of a movable contact (4) and acquires accurate motion parameters of the movable contact (4); switching-closing operating parameters are obtained by comprehensively calculating arc light intensity detected by an arc light transmitter (20) and a temperature measured by an infrared temperature measuring transmitter (22), such that the switching-closing performance of switching on and switching off a medium-voltage power grid is greatly improved, switching-closing time points can be accurately controlled, and “flexible” switching-closing is achieved.