FIELD: transportation; measurement technology.
SUBSTANCE: group of inventions relates to methods and devices used for calculation of capacity of designed hydraulic circuits of transport and dosing systems in chemical, petrochemical, aviation, textile, paint and other industries, particularly to transportation units of adhesive compositions in assembly plants with adhesive joints. Essence of declared method involves experimental determination of average value (ξcp) total pressure loss coefficient in channel on local resistances by feed of tap water at room temperature. Watering is performed on path with design structural elements of local resistances and sizes of inner diameters of pipelines by means of multiple portioned dosage of water into measuring containers with constant volumetric flow rate of Qj at various, stepped variable from maximum to minimum values and maintained during every operation of dosing at constant level values of active head Hj. Consumption Qj are determined by weighing of measured doses of water on electronic scales. Calculations of parameter ξcp and value of flow characteristics of path on parameters of natural liquid, preset range of change of flow rate and actual length of pipelines are performed on personal computer with help of electronic tables Microsoft Excel by formulas Bernoulli equation for steady incompressible fluid flow. Device for determining average value of total pressure loss coefficient on local resistances comprises service tank with tap water, service tank with bubbling and indication tubes with shutoff valves to feed compressed air and filling liquid connected to its lower part of duct with shut-off device at its output, measuring container, system of water pumping from supply tank in feed tank and pneumatic and electronic control unit. System for filling of main tank comprises jet ejector with shutoff valves on air supply line and vacuum line; locking device is made in form of ball valve with double-sided pneumatic drive. Control unit consists of pneumatic pressure regulator and electropneumatic time device, which includes an electronic timer for setting and time of dispensing electricity to air converter and logic pneumatic element NOT, output of which is connected to positive input of pneumatic drive of ball valve, and input is connected to negative input of pneumatic drive and to output of electricity to air converter. Pressure regulator comprises five-membranes comparison element of preset and actual values of pressure at output of bubbling tube is pressure sensor in service tank, pneumatic relay switch of five-membranes comparator output signal to inputs of power amplifiers, outputs of which are connected via gas collecting main to shutoff valve supplying compressed air in service tank. Pressure regulator control panel comprises toggle switch to control set or actual full pressure on reference manometer, toggle switch of pressure feed in feed tank and full pressure setter.
EFFECT: high accuracy and reliability of determining rated flow characteristics of hydraulic circuit at operation on liquid products with different viscosity and possibility of its prediction at variation of specified range of change of flow rate and length forming path sections of pipelines, as well as rapid determination of average (for specified range of change of flow rate) value of total coefficient of active losses in pressure channel on local resistances.
4 cl, 1 dwg
