Air pump with external pressure relief valve

An air pump with an external pressure relief valve, comprising:

• an air pump body, comprising a driving motor and at least one air bag set actuated by the driving motor to generate an output airflow;
• a flow passage base, arranged on the air pump body, the flow passage base comprising an airflow channel and a pressure relief channel, the airflow channel receiving the output airflow of the air bag set and provided with at least two airflow outlets, the pressure relief channel communicated with a central of the airflow channel and extending to any sidewall surface of the flow passage base, wherein a mounting hole is formed on the sidewall surface to communicate with the pressure relief channel, and a pressure relief assembly is placed into the pressure relief channel through the mounting hole, wherein from the airflow channel to the mounting hole, the pressure relief channel includes an arrangement section, a movable section, and a mounting section with different inner diameters separately, and wherein the inner diameters in an ascending order is the arrangement section, the movable section, and the mounting section;
• and
• at least two air valves, arranged on the flow passage base and respectively communicated with the at least two airflow outlets to receive the output airflow;
• wherein the flow passage base includes at least one first arrangement socket positioned at one of the at least two airflow outlets to accommodate one of the at least two air valves.