Patent TW-200821788-A (TW)
Title: Measurement instrument for restriction parameter and flow resistance
Inventor: KANG YUAN
IPC: G05D16/00
Filed: 2006-11-10
Abstract: Provided is a fluid measuring instrument for throttle parameter and flow resistance. It can be applied to measurement of throttle parameter and flow resistance of a variety of valves, connectors, pipes, and throttles. The measurement instrument comprises a load platform, an oil supply pump, a flow distribution system, sensors, a signal/data processing system. The load platform comprises a carrier platform, a lateral static-pressure oil chamber support, a support seat and an oil-collecting tank. The oil supply and flow distribution system comprises an oil supply pump, a storage tank for pressure stabilization, a filter for trapping fluid impunities, a relief valve, a check valve and a triple-point set. The sensors comprises sensors of flow rate, temperature and pressure sensor. The signal/data processing system is divided into two parts, hardware and software. The hardware comprises a data capturing card, a signal junction box, a flat cable and a host computer. The software comprises a human machine interface, signal analysis and a procedure code. A fluid pressurized by the oil supply pump flows through the flow distribution system and uses the two separated fluid flow routes to supply the static-pressure for the load platform. After one of fluid routes has its pressure adjusted using a capillary distributor, it flows through an oil chamber supported by the lateral static-pressure oil chamber support for lateral positioning of the carrier platform. After the fluid in the other flow route is precisely measured for its pressure difference and flow rate, it flows to the oil chamber of the carrier platform. The temperature sensor, placed before the to-be-measured component, is used to measure flow-in and flow-out temperature, the pressure sensor is used to measure the inlet/outlet pressure of the to-be-measured component and the inlet pressure of the support slide-track chamber, and the flow rate sensor is used to measure flow rate after the to-be-measured component. The senor uses a signal isolation line to connect its voltage signal to the signal junction box, and via the flat cable to connect to the data capturing card. Via the data capturing card, each sensor's analog signal is converted to digital signal. The digital signal is then multiplied by a calibration constant to become the inlet pressure/outlet pressure of the to-be-measured component, the oil chamber pressure and flow rate value of the lateral static pressure oil chamber support. Via a numerical calculation, the flow-resistance of the to-be-measured component is obtained. Next, the temperature value is put into a program to calculate fluid-viscosity coefficient, further the fluid-viscosity coefficient and the fluid-resistance are put into a program for calculation to obtain the throttle parameter of the to-be-measured component. The human machine interface comprises an operating screen, settings of numerical input and parameter input, dynamic measurement signal, the calculation results of dynamic physical quantity and parameter quantity, the measurement of throttle parameter and the flow resistance the to-be-measured component, and result output display.