Patent ID: 7550036

Claim:
A gas concentrator, which produces concentrated gas by applying a pressure difference to adsorbent having selective adsorption property to specific gas from mixed gas and by separating the specific gas, comprising: a filter for filtering out impurities from the mixed gas; a plurality of adsorption beds containing the adsorbent for separating the specific gas from the mixed gas supplied via the filter; a backflow prevention means formed on channels through which the separated gas in the adsorption beds is discharged; a small-diameter pipe for interconnecting the channels at production ends of the adsorption beds with each other to perform processes of cleaning and applying vacuum pressure to the adsorption beds, the small-diameter pipe having a diameter smaller than a diameter of the channels; a vacuum pumping means connected to a channel for supplying the mixed gas to the adsorption beds, the vacuum pumping means generating the pressure difference caused from a difference between the a vacuum pressure and a pressure of the mixed gas; a valve means comprising a channel base of a single body formed with channels respectively connected to the adsorption beds, a channel connected to a mixed gas supplying channel, and a channel connected to the vacuum pumping means, and solenoid drivers mounted in the channel base for switching the channels formed in the channel base in order to alternately apply the vacuum pressure and the pressure of the mixed gas to the adsorption beds; and a gas supplying means for supplying a target space with the gas which flow rate and concentration are controlled by controllably supplying the mixed gas supplied from the filter to the gas separated and produced in the adsorption beds, wherein the channel base of the valve means, which is formed in the single body formed with the channels, is formed with mounting portions for mounting the solenoid drivers, bed connecting portions to be connected to the adsorption beds, and a channel connecting portion to be connected to the mixed gas supplying channel, wherein each of the solenoid drivers of the valve means comprises a frame for supporting the whole of the solenoid driver, a coil housed in the frame for providing a motive force by a supplied current, a plunger for opening and closing the channel through its reciprocation by the motive force of the coil, guide pipe for guiding the plunger, and a pumping means connecting portion extended on the guide pipe, wherein each of the solenoid drivers is divided from one other by a partition, and wherein the bed connecting portions are communicated with the channel connecting portion when the pumping means connecting portion is closed by the plunger of the solenoid drivers, and the bed connecting portions are communicated with the pumping means connecting portion when the pumping means connecting portion is opened by the plunger of the solenoid drivers.