| 摘要 |
<p>An ejector device (100) for compressing and pumping a fluid, especially a gas, comprises: an injector portion (110), and a diffuser portion (150), the injector portion (110) being arranged for injecting a motive fluid from a motive fluid inlet into the diffuser portion (150) thereby to draw a suction fluid into the diffuser portion (150) from a suction fluid inlet (120), and the diffuser portion (150) including a Venturi portion comprising a converging inlet section (152), a throat section (154) and a diverging outlet section (156), wherein the throat section (154), which is preferably smooth-walled with a uniform diameter along its length, has a length Lt defined by the following equation (I): Lt > x Dt (I), where Dt is the diameter of the said throat section (154) and x is a number (especially an integer) greater than 6, preferably greater than 7, especially a number in the range of from about 10 up to about 50. In embodiments the injector portion (110) of the ejector device (100) additionally comprises a rotational deflector element (180), constructed and arranged to rotate motive fluid as its passes from the motive fluid inlet into the diffuser portion (150), comprising a plurality of helical deflector vanes (182a, 182b, 182c) arranged for imparting helical rotation to the motive fluid as its passes the said vanes (182a, 182b, 182c), each said deflector vane (182a, 182b, 182c) having: a longitudinal length being approximately equal to or less than a diameter of the injector portion (110); and a radial twist angle of greater than approximately 30°, preferably a twist angle in the range of from about 35 or 40 ° up to about 80 or 90 °.</p> |
