A pump that uses ultrasound and has no areas that can be rubbed.
Monozukuri (Saitama University Research Seed Collection 2025-27 p.64)
Keywords: Ultrasonic Pump Non-contact
Pumps that transport liquids and gases use rubber valves to prevent backflow and employ bearings to support rotating parts. Since these components are constantly rubbing against each other, they can be a source of failure. Additionally, using rubber makes them unsuitable for low-temperature environments (where the rubber hardens) and high-temperature environments (where the rubber melts). By eliminating the rubbing parts, the probability of failure decreases, and they can be used in both low and high-temperature environments. By exciting high-frequency vibrations, which are inaudible to the human ear, on the surface of a solid and positioning another surface a few tens of microns apart, with some clever modifications to those surfaces, the fluid in the gap flows in one direction, functioning like a pump. There are no rubber components used, and there are no rubbing parts. Research is being conducted to increase pressure and flow rate with this type of pump configuration. The introduction of an ultrasonic non-contact rotating mechanism is also being considered.
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Masaya Takasaki, Professor Graduate School of Science and Technology, Department of Mechanical Engineering, Human Support Engineering Area 【Recent Research Topics】 ● Ultrasonic Motors ● Skin Sensation Display Using Ultrasound ● Non-contact Support of Objects Using Ultrasound ● Page Turning Mechanism Using Ultrasound ● Dehydration of Microscopic Diameter Holes Using Ultrasound
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【Appeal Points to the Industry】 ● Usable as a pump at temperatures (from cryogenic to Curie temperature) that piezoelectric materials can handle for ultrasonic excitation ● No sliding parts, eliminating concerns about wear ● Miniaturization is possible depending on the design of the transducer ● Patent Application No. 2014-243990
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Non-contact rotating mechanism
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.