A device has a power source having a high voltage terminal and a low voltage terminal, an oil-free gas compressor, a first molecular sieve, multiple ionized gas generators, an outer metal pipe, an inner metal pipe, a dielectric insulating ceramic sheet, and a gas outlet pipe. The first molecular sieve is connected between the oil-free gas compressor and the ionized gas generators, and is capable of filtering out molecules in the gas except for oxygen. The outer metal pipe and the inner metal pipe are electrically connected to the low voltage terminal and the high voltage terminal respectively. The dielectric insulating ceramic sheet is mounted between the outer metal pipe and the inner metal pipe, and forms an ionizing space, which communicates with the ionizing space, with the outer metal pipe.

A device has a power source having a high voltage terminal and a low voltage terminal, an oil-free gas compressor, a first molecular sieve, multiple ionized gas generators, an outer metal pipe, an inner metal pipe, a dielectric insulating ceramic sheet, and a gas outlet pipe. The first molecular sieve is connected between the oil-free gas compressor and the ionized gas generators, and is capable of filtering out molecules in the gas except for oxygen. The outer metal pipe and the inner metal pipe are electrically connected to the low voltage terminal and the high voltage terminal respectively. The dielectric insulating ceramic sheet is mounted between the outer metal pipe and the inner metal pipe, and forms an ionizing space, which communicates with the ionizing space, with the outer metal pipe.