Industrial Technology Research Institute

Jung-chen Chein

Tean-Mu Shen

Ming-Hsin Liu

Chun-Chien Chen

A combination double screw rotor assembly includes a first screw rotor and a second screw rotor arranged in parallel in a casing, the first screw rotor and the second screw rotor each having a low pressure screw rotor element, a high pressure screw rotor element, and a spiral thread formed of a first spiral thread segment at the high pressure screw rotor element and a second spiral thread segment at the low pressure screw rotor element, the first spiral thread segment having an uniform short pitch, the second spiral thread segment having an uniform long pitch, the upper spiral thread segment and second spiral thread segment of the first screw rotor being respectively meshed with the first spiral thread segment and second spiral thread segment of the second screw rotor. During operation of the combination double screw rotor assembly, the flow of air moves from relatively greater air chambers around the low pressure screw rotor elements of the screw rotors toward the relatively smaller air chambers around the high pressure screw rotor elements of the screw rotors, and is compressed in the relatively smaller air chambers, preventing a reverse flow due to a significant pressure difference between the forwarding flow of air and the area around the outlet, so as to minimize power loss and operation noise.

Growing community of inventors

Hsinchu Hsien, Taiwan

Jung-chen Chein