Didactic System For The Study Of Pumps (DL HBTV-S)
PL-579871
The didactic bench has as objective the study and training in maintenance and assembly of different types of pumps in the range of 6 to 170 liters per minute with a maximum speed of 1750 RPM, in the range of 350 Watts. The workbench uses a water tank and an oil tank. Supplied with a three-phase multimeter providing active and reactive power, consumed current and applied voltage. The multimeter comes with a USB interface for data acquisition to be displayed on a PC with Excel spreadsheets, in these spreadsheets the measured values can be displayed, and the desired curves can be plotted. Each pump is controlled by an inverter which regulates the speed and measures the developed torque independently. The bench was designed to perform experiments with various types of three-phase hydraulic pumps, with an inverter located inside the panel. The frequency converter allows speed and torque measurement to be adjusted. The system aims to raise and compare the pump curves. The teaching bench also allows the analysis of the hydraulic power by means of flow and head measurements; it contains a rotameter that measures the flow of the selected pump. The bench has an HMI to operate and control the entire system. All steel parts are sandblasted, phosphated and painted by an electrostatic process, and pressure glass parts are borosilicate.
Main experiments related to hydraulic pumps: 1. Characteristic curve of a centrifugal pump with acrylic device, suitable for simulating and visualizing the phenomenon of cavitation. 2. Characteristic curve of a peripheral centrifugal pump, fitted with an acrylic tube to visualize changes in flow. 3. Characteristic curve of a gear pump, circulating oil from a dedicated tank of approximately 60 liters. 4. Characteristic curve of a submerged pump. 5. Head, flow, power, and torque measurements. Main consumption experiments in: 1. Electric energy calculation, 2. Hydraulic power calculation. MAIN ELEMENTS OF THE SYSTEM • One gear, three-phase 0.5 HP pump, 6 poles with a head of 0-40 MCA and a flow rate of 0-12 L/min (0-0.72 m3/h). • One submerged , three-phase 0.5 hp pump, 2 poles with a head of 0-10 MCA and a flow rate of 0-166 L/min (0 to 10 m3/h). It is housed within an acrylic oil tank of approximately 60 liters and 10 mm thick. • A centrifugal, 0.5 hp, 2-pole pump, three-phase, with a head of 0-20 MCA and a flow rate of 0-66 L/min (0-4 m3/h). • Centrifugal turbine-type 0.5 hp pump, 2 poles, with a head of 0-20 MCA and a flow rate of 0-40 L/min (0-2.4 m3/h). • The panel contains a 7” HMI to control the entire system, an emergency button, a multimeter, a rotary switch to allow selection of the motor pump to be measured and a red LED to indicate when the panel is energized. • Single-phase and three-phase, bi-directional and four-quadrant electric magnitude multimeter, with inductive and capacitive reactance indication. The module measures various types of electrical quantities, such as line and phase voltage, current, active, reactive, apparent, three phase, frequency and demand power, and provides THD measurements. It can measure up to 500 VAC voltage and 5 A current and provides an RS-485 communication port. • 7-inch color touchscreen HMI with Type RS485 data buses and Ethernet, both with MODBUS communication. It has a USB port to connect a pendrive for data transfer. • A gauge to display the engine torque in Nm. • 04 (four) frequency converters, each pump is controlled by a converter which regulates speed and measures torque independently. The frequency converter allows the measurement of speed and torque to be adjusted, they are located inside the panel. • A VG-68 or similar stainless steel oil storage tank; capacity, approximately 50 liters for hydraulic system recirculation, with positive displacement gear pump. • A water storage tank, with a capacity of approximately 190 liters for the recirculation of the hydraulic system, with positive displacement centrifugal pumps. • Three flowmeters for flow measurement in m³/h. It has a measuring scale with display of up to 8m³/h, to measure the pump flow of each pump, with pointer-type valves and pressure gauges (manometer). • One flowmeter to measure oil flow.
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