Teijin Limited

Teijin Pharma Limited

Naotoshi Fujimoto

Hideo Nawata

Kanji Kurome

Sadakazu Matsubara

Hideo Teijin Pharma Limited Nawata

Kanji Teijin Pharma Limited Kurome

Sadakazu Teijin Pharma Limited Matsubara

An oxygen concentration apparatus () according to the present invention has: pressure swing adsorption type oxygen concentration means (); and a control means () that controls switching means () that switches between intake of pressurized air into an adsorption column () and exhaust from the adsorption column. The switching means is controlled based on pressure in oxygen concentrated gas in the conduit measured by pressure measuring means to adjust a cycle of adsorption and regeneration processes of the oxygen concentration means so that pressure at the upstream of flow rate adjusting means () can be controlled and, as a result, the need for a mechanical pressure regulating valve, that has been needed conventionally, can be eliminated. Further, there is also shown a gas supply apparatus that comprises ultrasonic type gas concentration and flow rate measuring means that comprises, in turn, two ultrasonic transducers that is disposed in an opposed manner in the conduit through which product gas flows so that a concentration value measured when the product gas output is stopped is determined to be a product gas concentration.

Oxygen concentration apparatus

An ultrasonic apparatus measures the concentration and flow rate of a sample gas by calculating a possible propagation time range on the basis of the gas temperature, determining whether or not the phases at which two first trigger signals, respectively generated on the basis of forward and backward waveforms of the ultrasonic waves, coincide with each other, processing the zero-cross signals so that the phases coincide with each other, obtaining reference zero-cross time instant by calculating mean value of the forward and backward zero-cross time instants, obtaining an ultrasonic reception point by subtracting an integral multiple of the cycle of the ultrasonic waves so that the results of the subtraction falls into a possible propagation time range and estimating the ultrasonic propagation time on the basis of the ultrasonic reception point.

Ultrasonic apparatus and method for measuring the concentration and flow rate of gas

An apparatus for generating an oxygen enhanced gas by removing nitrogen gas from air, includes a compressor, absorption columns for removing the nitrogen gas from the pressurized air supplied from the compressor, a flow rate measuring device provided downstream of the absorption columns, a manner of measuring ultrasonic oxygen concentration that includes a manner of generating a correction coefficient for a ratio between oxygen and argon gases contained in the oxygen enhanced gas based on the flow rate of the oxygen enhanced gas measured.

Oxygen concentrating apparatus

An apparatus for measuring a gas concentration comprises a conduit through which an objective gas to be measured flows, a ultrasonic transmitting and receiving element fixed in a straight portion of the conduit and a reflecting plate fixed in the straight portion to face to the ultrasonic transmitting and receiving element. The apparatus further comprises a calibration gas source for supplying a calibration gas of which components and component ratio are preliminarily known, temperature sensors for measuring the temperature of the calibration gas flowing through the conduit, a propagation time calculating means for calculating the time period for propagation of the ultrasonic through the calibration gas in the conduit, a calibration means for calibrating the reference distance between the ultrasonic transmitting and receiving element and the reflecting plate based on the calculation results of the propagation time calculating means.

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Hino, Japan

Naotoshi Fujimoto