| 摘要 |
<p>(Figure 1) IMPROVEMENTS RELATING TO DOUBLE-DIAPHRAGM PUMPS A double diaphragm pump comprises a centre body 10 and two end-caps 11, 12, the outer peripheries of two diaphragms 20, 21 being clamped between the centre body and the two end-caps respectively. The diaphragms are interconnected by a hollow push-rod 26 slidably and sealingly mounted in a bush 17 in the centre body. A shaft 30 extends centrally through the push-rod, diaphragm and end-cap and has a radial flange at one end and a nut engaged on a screw-thread at its other end whereby the end-caps, diaphragm and centre body are clamped axialy together. Air under pressure is supplied to the two axially outer chamber 23, 24 formed between the diaphragms and the end-caps under the control of a change-over spool valve 45, change-over operation of which is initiated by the approach of the push-rod 26 to either end of its reciprocating movement.</p> |
