Abstract: A dust collector is provided, which includes a housing, a filter screen, and a spiral air director. The housing is provided with an air inlet, an air inlet channel, an air outlet channel, an air outlet, and a dust collection chamber. The dust collection chamber is in communication with the air inlet and the air outlet through the air inlet channel and the air outlet channel, respectively. The filter screen is disposed in the air outlet channel. The spiral air director is disposed in the air outlet channel and located on at least one side of an air inlet side and an air outlet side of the filter screen. Air flow flowing through the air outlet channel is directed by the spiral air director to form a swirling air flow.

Abstract: An emergency power supply is electrically connected to the vehicle-mounted power-consuming device through an electrical connecting device. Magnetic attraction between the first magnet and the matching member matches the spherical bump and the spherical groove, where the first conductive member is electrically connected to the second conductive member without suffering from elastic fatigue. Contact between the spherical bump and the spherical groove has a large surface area that maintains reliable contact even when subject to vibrations. Therefore, the above-mentioned electrical connecting device significantly improves the reliability of the electrical connection between the emergency power supply and the vehicle-mounted power-consuming device.