Premixer and gas device

A premixer comprising:

• a premixer body provided with a gas channel;
• an adjustment shaft;
• a gas regulator provided at the adjustment shaft;
• and
• a gas distribution member,
• wherein:
• the adjustment shaft is at least partially rotatably provided in the gas channel;
• the gas distribution member is at least partially provided in the gas channel, the gas distribution member comprises a gas distribution chamber, a gas inlet hole and a gas distribution hole, wherein the gas inlet hole and the gas distribution hole respectively communicate with the gas distribution chamber;
• the gas inlet hole communicates with an external gas source;
• the adjustment shaft and the gas regulator are both provided external to the gas distribution hole;
• the gas regulator is provided in the gas distribution chamber and configured to adjust a gas flow area of the gas distribution hole along with rotation of the adjustment shaft;
• an inner chamber wall of the gas distribution chamber where the gas distribution hole is located has a circular cross section along a radial direction of the adjustment shaft, and the gas regulator has an arc-shaped outer wall surface adapted to the inner chamber wall of the gas distribution chamber;
• the gas regulator and the adjustment shaft together form a gas supply notch, or the gas regulator is provided with the gas supply notch;
• when the gas regulator rotates within a first angle range, at least a portion of the gas supply notch faces the gas distribution hole to unblock the gas distribution hole;
• and
• when the gas regulator rotates within a second angle range, the gas supply notch is completely offset with respect to the gas distribution hole, and an outer peripheral wall of the gas regulator blocks the gas distribution hole.

A premixer comprising:

• a premixer body provided with a gas channel and a gas distribution chamber provided in the gas channel;
• an adjustment shaft rotatably passing through the gas distribution chamber;
• and
• a gas regulator provided at a portion of an outer peripheral wall of the adjustment shaft and provided in the gas distribution chamber,
• wherein:
• a side wall of the gas distribution chamber is provided with a gas inlet hole and a gas distribution hole;
• an inner chamber wall of the gas distribution chamber where the gas distribution hole is located has a circular cross section along a radial direction of the adjustment shaft, and the gas regulator has an arc-shaped outer wall surface adapted to the inner chamber wall of the gas distribution chamber;
• when the gas regulator rotates within a first angle range, the gas regulator unblocks the gas distribution hole and adjusts a gas flow area of the gas distribution hole by rotation;
• when the gas regulator rotates within a second angle range, an outer peripheral wall of the gas regulator blocks the gas distribution hole, and the first angle range and the second angle range are non-overlapping.