Dynamic mixer head with sealing portion

A dynamic mixer head comprising:

• a cover having:
• a first base board having:
• a first engaging portion formed on a border of the first base board;
• two inlets formed through the first base board and spaced apart from each other;
• and
• a holding cylinder formed on the first base board;
• the holding cylinder having:
• a rotor holding channel formed in the holding cylinder and spatially communicating with two ends of the holding cylinder;
• and
• a sealing portion protruding from an inner wall surface of the rotor holding channel;
• a housing mounted on the cover and having:
• a second base board engaged with the first base board and having:
• a second engaging portion formed on a border of the second base board and engaging with the first engaging portion;
• two grooves recessed from a surface of the second base board, said surface of the second base board facing to the first base board, and each one of the two grooves fluidly communicating with a respective one of the two inlets of the cover;
• a mixing cylinder connected to another surface of the second base board, said another surface being away from the first base board;
• the mixing cylinder having:
• an outlet formed on an end surface away from the second base board;
• an inner channel formed in the mixing cylinder, and being through the mixing cylinder and the second base board;
• the inner channel fluidly communicating with the outlet, the two grooves, and the rotor holding channel;
• and
• a rotor rotatably disposed in the inner channel and through the cover, the rotor having:
• a rotor axle disposed through the rotor holding channel, and a peripheral surface of the rotor axle contacting and surrounded by the sealing portion;
• and
• a mixing rod connected to the rotor axle and disposed in the inner channel, and the mixing rod having:
• multiple first vanes protruding from a peripheral surface of the mixing rod;
• and
• wherein the sealing portion includes:
• multiple annular ribs disposed along an extending direction of the rotor holding channel and spaced apart from each other, and each one of the annular ribs surrounding and contacting the peripheral surface of the rotor axle.