An intake module comprising: an air delivery tube including an outer tube body and an inner tube body disposed in said outer tube body, said outer tube body having an intake end, an exhaust end opposite to said intake end, an intake chamber that is defined by said outer tube body and that is open at said intake end, and an intake port that is formed between said intake end and said exhaust end and that exposes said intake chamber, said inner tube body extending from said exhaust end towards said intake end and having an exhaust hole disposed at an end thereof and adjoining said exhaust end, and an intake hole disposed at an opposite end thereof and in fluid communication with said intake chamber; and an intake lid covering said intake end and sealing said intake chamber, said intake lid having an inlet hole adapted for allowing said intake chamber to be in fluid communication with the outside therethrough so that a compressed gas is fed into said inlet hole; characterized by an entrainment cover sleeved on the end of said inner tube body formed with said intake hole and having a positioning hole formed therethrough and disposed between said inlet hole and said intake hole, and an entrainment port disposed between and in fluid communication with said intake chamber and said intake hole; and a needle tube extending into said inlet hole and said positioning hole and defining a jet hole adapted for spraying the compressed gas from said needle tube into said intake hole in said inner tube body of said air delivery tube, said jet hole having a diameter less than that of said intake hole of said inner tube body; wherein, when the compressed gas is delivered from said intake lid into said inner tube body of said air delivery tube, air is drawn into said intake hole to mix with the compressed gas according to Venturi effect. an air delivery tube including an outer tube body and an inner tube body disposed in said outer tube body, said outer tube body having an intake end, an exhaust end opposite to said intake end, an intake chamber that is defined by said outer tube body and that is open at said intake end, and an intake port that is formed between said intake end and said exhaust end and that exposes said intake chamber, said inner tube body extending from said exhaust end towards said intake end and having an exhaust hole disposed at an end thereof and adjoining said exhaust end, and an intake hole disposed at an opposite end thereof and in fluid communication with said intake chamber; and an intake lid covering said intake end and sealing said intake chamber, said intake lid having an inlet hole adapted for allowing said intake chamber to be in fluid communication with the outside therethrough so that a compressed gas is fed into said inlet hole; characterized by an entrainment cover sleeved on the end of said inner tube body formed with said intake hole and having a positioning hole formed therethrough and disposed between said inlet hole and said intake hole, and an entrainment port disposed between and in fluid communication with said intake chamber and said intake hole; and a needle tube extending into said inlet hole and said positioning hole and defining a jet hole adapted for spraying the compressed gas from said needle tube into said intake hole in said inner tube body of said air delivery tube, said jet hole having a diameter less than that of said intake hole of said inner tube body; wherein, when the compressed gas is delivered from said intake lid into said inner tube body of said air delivery tube, air is drawn into said intake hole to mix with the compressed gas according to Venturi effect.