Fluid mixer and apparatus using fluid mixer

A fluid mixer comprising:

• a fluid inlet;
• a first flow passage that is connected to the fluid inlet;
• a second flow passage that is arranged so as to communicate with or be partitioned from the first flow passage and that is arranged to share the same central axis with the first flow passage;
• a third flow passage that is connected to the first flow passage and that is arranged to an outer periphery of the second flow passage;
• a plurality of branching flow passages that branch from the third flow passage and that are connected to the second flow passage;
• and
• a fluid outlet that is connected to the second flow passage,
• and wherein
• the plurality of branching flow passages branch from different positions in the third flow passage, respectively, and are connected to the second flow passage at different positions in the second flow passage, respectively;
• the fluid mixer comprises:
• an element comprising a main body formed in a substantially truncated cone shape at an end of which the fluid outlet is formed, in an inside of which the second flow passage is formed, and on an outer peripheral surface of which a plurality of communication holes are formed to allow the second flow passage and an outside to communicate with each other;
• and
• a housing that comprises a first flow passage forming part at an end of which the fluid inlet is formed and in an inside of which the first flow passage is formed, that houses the element therein, and that engages with at least an end of the element at which the fluid outlet is formed;
• a plurality of delaying members comprising plate-shaped protrusions are discontinuously arranged on at least one of an inner peripheral surface of the housing or an outer peripheral surface of the main body in a flow passage axis direction;
• a single continuous space is formed between the inner peripheral surface of the housing and the outer peripheral surface of the main body, the space serving as the third flow passage;
• and
• the communication holes serve as the branching flow passages.