Premixer and gas device

A premixer, comprising:

• a premixer body provided with a gas channel and a gas distribution chamber provided within the gas channel;
• an adjustment shaft rotatably passing through the gas distribution chamber;
• and
• a gas regulator provided within the gas channel and located at the adjustment shaft, wherein:
• the gas distribution chamber has a cylindrical inner wall, and a side wall of the gas distribution chamber is provided with a gas inlet hole, a first gas distribution hole, a second gas distribution hole, a third gas distribution hole, and a fourth gas distribution hole, the first gas distribution hole and the second gas distribution hole being spaced apart, the third gas distribution hole and the fourth gas distribution hole being spaced apart, and wherein a pattern formed by the first gas distribution hole being non-congruent with a pattern formed by the third gas distribution hole, and areas of the second gas distribution hole and the fourth gas distribution hole being different;
• the gas regulator is synchronously rotatable along with the adjustment shaft and has an arc-shaped outer wall surface adapted to the inner wall of the gas distribution chamber;
• when the gas regulator rotates within a first angle range,
• the second gas distribution hole is completely unblocked;
• the third gas distribution hole and the fourth gas distribution hole are blocked;
• and
• the gas regulator is capable of rotating to adjust a gas flow area of the first gas distribution hole to regulate an amount of gas flowing through the first gas distribution hole;
• and
• when the gas regulator rotates within a second angle range,
• the first gas distribution hole and the second gas distribution hole are blocked;
• the fourth gas distribution hole is completely unblocked;
• and
• the gas regulator is capable of rotating to adjust a gas flow area of the third gas distribution hole to regulate an amount of gas flowing through the third gas distribution hole.