| 摘要 |
Method of achieving with at least two compressed air operated ejectors a desired subpressure in the shortest possible time and with the least use of energy, this method including connection of the ejectors such that they work one at a time in response to which of them is supplied with compressed air. In turn, compressed air supply is controlled in respons to the subpressure in a subpressure collection chamber common for all ejectors. An ejector array (1) for the method includes at least two compressed air operated ejectors (2, 3) each having its own optimum efficiency at the same values of the supplied compressed air. A sensor is disposed for sensing the subpressure in the chamber (23), compressed air being supplied to one ejector (2, 3) at a time, in response to the sensed pressure in the chamber (23). Compressed air is first supplied to the ejector (2) evacuating the greatest amount of air per time unit, and last to the ejector (3) generating the lowest subpressure. <IMAGE> |
