Anemometer refers to a speed measuring instrument that converts a flow rate signal into an electrical signal and measures the temperature or density of the fluid. The principle of the thermal anemometer is to place an electrically heated, fine wire in an air stream. The amount of heat dissipated by the hot wire in the air flow is related to the flow rate, and the amount of heat dissipated causes a change in the resistance of the heat wire and the flow rate signal is converted to electricity. signal. The main components of the thermal anemometer are the wind speed probe and measurement indicator. The wind speed probe can be further divided into a thermal probe and a rotary probe. Thermal anemometer according to the structure points, there are hot-ball and hot-line; according to the display form, there are pointer, digital, etc.; according to the principle of work, there are constant-flow and constant temperature. The principle of the constant-flow anemometer is that the hot-wire current remains unchanged. When the temperature changes, the hot-wire resistance changes, so the voltage across the two ends changes and the wind speed is measured. The thermostat type means that the hotline temperature is constant, and then the wind speed is measured according to the applied current. Compared with the constant flow type, the thermostatic type is more widely used, the length of the hot wire is 0.5-2mm, the diameter is 1-10um, and the material is platinum, tungsten or platinum iridium alloy. The velocity probe can be divided into three zones: 0-5 m/s, 5-40 m/s, and 40-100 m/s. These are low, medium, and high speeds. Among them, the thermal probe is mainly applied to low speed, and the rotary probe is best used for medium speed effect. 1 Anemometer thermal probes. The principle of the thermal probe is based on the cold-impact air flow to remove the heat from the thermal element. With a regulating switch, keeping the temperature constant, the current and the flow rate are regulated in direct proportion to each other. When thermal probes are used in turbulent flow, airflow from all directions simultaneously impacts the thermal elements, which affects the accuracy of the measurement results. When measuring in turbulent flow, thermal anemometer flow sensor values ​​tend to be higher than rotary probes. The above phenomena can be observed during the pipeline measurement. Depending on the design of the turbulence in the management pipeline, it can even occur at low speeds. Therefore, the anemometer measurement process should be performed on the straight part of the pipeline. The starting point of the straight part should be at least 10 × D before the measuring point (D = pipe diameter in CM); the ending point is at least 4 × D after the measuring point. The fluid cross section must not have any blockage. (Angle, re-suspended, objects, etc.). The working principle of the rotary probe is based on converting the rotation into electrical signals, first passing through a proximity sensor to start the "counting" of the rotation of the runner and generating a pulse series, and then the conversion processing by the detector can obtain the rotational speed. value. The anemometer's large-diameter probe (60mm, 100mm) is suitable for measuring turbulence in medium and small flow rates (eg at the outlet of pipes). The anemometer's small-caliber probe is more suitable for measuring air flow with a cross-section greater than 100 times more than the cross-section of the explorer. The anemometer hotline is single-wired, double-wired and three-wired to measure the speed components in all directions. From the electric signal output from the hotline, it is amplified, compensated and digitized and then input into the computer, which can improve the measurement accuracy, automatically complete the data post-processing process, and expand the speed measurement function. For example, the instantaneous value and time average value, combined velocity and velocity, and turbulence can be accomplished simultaneously. Degrees and other turbulence parameter measurements. Hot wire anemometers are good at measuring low wind speeds and have an irreplaceable role in measurement. Today, thermal anemometers are mainly used for heating, ventilation, air conditioning, environmental protection, energy monitoring, meteorology, agriculture, refrigeration, drying, labor hygiene investigations, cleanrooms, and various wind speed laboratories. Humanized man-machine interface display control system--Air Compressor Drilling Power Systems,Rig Power System,Drilling Rig Power System,Power System Drilling JIANGSU XI TEC ENVIRONMENTAL&DRILLING EQUIPMENT COMPANY CO.LTD , https://www.xitecdrilling.com
• The operation is particularly convenient and simple, and the running status is clear at a glance.
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• Once abnormal factors appear, maintenance or overhaul will be prompted in Chinese.
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June 12, 2024