Premixer and gas device

A premixer comprising:

• a base provided with an air channel, a gas channel and a gas-air mixed channel communicating with the air channel and the gas channel;
• a regulate assembly comprising an adjustment shaft, an air flap provided at the adjustment shaft and a gas regulator provided at the adjustment shaft, the adjustment shaft being rotatably provided at the base, the air flap being provided at the air channel, and the air flap being configured to adjust air flow area of the air channel as the adjustment shaft rotates to adjust amount of air flowing into the gas-air mixed channel;
• and
• a gas distribution member, the gas distribution member being at least partially provided in the gas channel, the gas distribution member being provided with a gas distribution chamber, a gas inlet hole communicating with the gas distribution chamber, and a gas distribution hole communicating with the gas distribution chamber, the gas inlet hole communicates with an external gas source, wherein the gas channel comprises a gas homogenizing flow chamber communicating with a gas outlet end of the gas distribution hole and the gas-air mixed channel, the gas homogenizing flow chamber being provided with a corner to cause the gas flow uniformly into the gas-air mixed channel, wherein:
• the gas regulator is rotatably provided in the gas distribution chamber, a rotation axis of the gas regulator coinciding with a rotation axis of the air regulator, an inner cavity wall of the gas distribution chamber at the gas distribution hole being circular in cross section along a radial direction of the adjustment shaft, the gas regulator being provided with an arc-shaped outer wall surface adapted to a cavity wall of the gas distribution chamber, the gas regulator and the adjustment shaft forming a gas supply notch, or the gas regulator being provided with a gas supply notch;
• when the gas regulator rotates within a first angle range, a notch of the gas supply notch is at least partially provided toward the gas distribution hole to unblock the gas distribution hole;
• and
• when the gas regulator rotates within a second angle range, the notch of the gas supply notch is provided toward a direction outside the gas distribution hole, and an outer peripheral wall of the gas regulator is configured to block the gas distribution hole.