Brewing device, beverage machine and control method for brewing device

A beverage machine, wherein the beverage machine comprising:

• a frame;
• a cylinder body, the cylinder body having a brewing chamber, the brewing chamber comprises a filling opening for filling powder material;
• a first piston closing the brewing chamber from the filling opening, the first piston being provided with a second transport pipeline;
• a second piston configured to perform a linear movement in the cylinder body, the second piston being provided with a first transport pipeline;
• a driving device provided on the frame, the cylinder body and the first piston being respectively drivably connected to the driving device;
• wherein one of the first transport pipeline and the second transport pipeline is configured to supply brewing water to the brewing chamber, and another one of the first transport pipeline and the second transport pipeline is configured to output beverage from the brewing chamber;
• the first piston has a first relative position in contact with the cylinder body and a second relative position at least partially compressing the brewing chamber;
• between the first relative position and the second relative position, the driving device drives the cylinder body and the first piston to simultaneously move toward each other to reduce the volume of the brewing chamber, or to simultaneously move away from each other to expand the volume of the brewing chamber.

A control method for a brewing device, the brewing device comprising:

• a cylinder body, the cylinder body having a brewing chamber;
• a first piston configured to be movable to close or open the brewing chamber;
• a second piston configured to move relative to the cylinder body within the brewing chamber;
• wherein the method comprises:
• transporting powder material to the brewing chamber;
• controlling a transmission mechanism of the brewing device to rotate in a first direction to cause the cylinder body and the first piston to move toward each other, during the relative movement between the cylinder body and the first piston, the cylinder body moves toward the first piston, and the first piston moves toward the cylinder body to close the brewing chamber and compress the powder material within the brewing chamber;
• supplying brewing water to the brewing chamber to perform beverage preparation.