Miniature pump device

A miniature air pump comprising:

• a driving unit;
• and
• an airflow control unit driven by the driving unit to input or output airflows, wherein the airflow control unit comprises:
• a piston base having at least one first intake through hole;
• a piston unit having at least one intake valve and at least one bladder portion, wherein the intake valve is covered over the first intake through hole;
• a first valve base disposed over the piston unit, a bottom surface of the first valve base having at least one flow guide groove, which crosses the intake valve and the bladder portion, the first valve base having at least one first output through hole corresponding to the bladder portion, the first valve base further comprising a circular wall surrounding the first output through hole;
• a first output valve disposed over the first output through hole;
• a second valve base coupled to the circular wall to collectively define a compression chamber, the second valve base having at least one second output through hole communicating with the compression chamber;
• and
• a second output valve covered over the second output through hole,
• when the bladder portion is being compressed, airflows inside the bladder portion are output through the first output through hole, the first output valve, the compression chamber, the second output through hole and the second output valve sequentially,
• when the bladder portion is being decompressed, airflows are introduced into the bladder portion through the first intake through hole, the intake valve and the flow guide groove sequentially.