After a period of time (when the wind speed is constant), when the partial pressure difference acting on the three wind cups is zero, the wind cup will change to rotate at a constant speed. The greater the acceleration, the faster the wind cup rotates.Īfter the wind cup starts to rotate, because the cup 2 rotates in the direction of the wind, the pressure of the wind is relatively reduced, and the cup 3 rotates at the same speed against the wind, the wind pressure is relatively increased, and the wind pressure difference is continuously reduced. The greater the wind speed, the greater the initial pressure difference. Due to the pressure difference between the wind cup 2 and the wind cup 3 in the direction perpendicular to the wind cup axis, the wind cup starts to rotate clockwise. For the wind cup 2, its concave surface is facing the wind and the wind pressure is the largest the wind cup 3 has its convex surface facing the wind, and the wind’s circumfluence makes it subjected to the wind pressure It is smaller than the wind cup 2. The wind cups 2 and 3 intersect at a 60-degree angle with the same wind direction. When the wind blows from the left, the wind cup 1 is parallel to the wind direction, and the component of the pressure of the wind on the wind cup 1 in the direction most perpendicular to the axis of the wind cup is approximately zero. The concave surfaces of the cups are arranged in one direction, and the entire transverse arm bracket is fixed on a vertical rotation axis. The hollow cup shells are fixed on a three-pointed star-shaped bracket that is 120° to each other or a cross-shaped bracket that is 90° to each other. The induction part is composed of three or four conical or hemispherical empty cups. The wind cup type wind speed sensor is a very common wind speed sensor. The propeller is generally installed at the front of a wind vane, so that its plane of rotation is always facing the direction of the wind, and its speed is proportional to the wind speed. Usually the propeller-type speed sensor measures the wind speed by rotating a group of three-blade or four-blade propellers around a horizontal axis. The blade system aligned with the air flow is subjected to the wind pressure, and a certain torque is generated to rotate the blade system. The working principle of the propeller anemometer is just the opposite. The electric fan is driven by the motor to rotate the fan blades, creating a pressure difference between the front and back of the blades, which promotes the air flow. It uses the kinetic energy of the flowing air to push the sensor’s propeller to rotate, and then calculates the air flow rate through the terminal device by the speed of the propeller. Propeller wind speed sensor is mainly composed of propeller blade, sensor shaft, sensor bracket and magnetic induction coil. wind speed sensor types Propeller wind speed sensor It is mainly used in meteorology, agriculture, ships and other fields, and can be used outdoors for a long time. The wind speed sensor types is roughly divided into mechanical (mainly propeller type, wind cup type) wind speed sensor, hot air type wind speed sensor, pitot tube wind speed sensor and ultrasonic wind speed sensor based on acoustic principle, the shell is made of high quality aluminum alloy profile or polycarbonate Composite material, rain-proof, corrosion-resistant and anti-aging, is a smart instrument that is easy to use, safe and reliable. Wind speed sensor is a common sensor that can continuously measure wind speed and air volume (air volume = wind speed x cross-sectional area).
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