| 摘要 |
<p>1. A device for detecting the volumetric flow of a liquid medium through an adjusting element (1), which is designed as a straight-way valve (4) and comprises an inlet nozzle (2) and an outlet nozzle (3), of a control section with an elastically deformable sealing element (7, 12) such as a diaphragm which initiates an opening movement of a valve member (6) of the straight-way valve (4) against a spring force FF , and with a stroke sensor (10) for detecting the position of the valve member (6), from which the volumetric flow V can be derived by taking into consideration the pressure difference DELTA pv existing over the straight-way valve (4), in which a controlled control valve (19, 34) is connected via connecting conduits (16, 17, 18) to various chambers of the straight-way valve (4), characterised in that the control valve (19; 34) can be controlled by at least one controller (22; 35, 45) and connects a first chamber (13) of the straight-way valve (4) limited by the sealing element (7, 12) via the connecting conduits (16, 17, 18) in a first stable control state to a second chamber (14) and in a second stable control state to the third chamber (15), in that the second chamber (14) comprises the outlet nozzle (3) and the third chamber (15) the inlet nozzle (2), in that the effective surfaces of the sealing element (7, 12) and of the valve member (6) designed as a valve disc as well as the spring force FF are selected such that, in the control state, the pressure difference DELTA pv arising over the straight-way valve (4) opens this straight-way valve (4) by means of the valve disc and, in the first control state, the spring force FF closes this straight-way valve (4) by means of the valve disc, and in that the stroke sensor (10) is connected to a computer (21) for determining the pressure difference DELTA pv and/or the volumetric flow V on the basis of the starting signals of the controller (22, 35, 45) and of the stroke sensor (10).</p> |
