JP4830086B2 - Anemometer - Google Patents

Description

  The present invention relates to an anemometer that easily measures wind speed.

  Speaking of anemometers, a hemispherical bowl-shaped wind receiver attached to the tip of the arm that is arranged radially from the central axis measures the wind speed based on the number of rotations when receiving the wind and rotating. It is used from. There is also a windmill type with a rudder called an anemometer, which can measure the wind speed even in a strong wind. However, the devices themselves were all large and could not be installed easily.

  As another anemometer, there is one using a thermistor having a heating function and a temperature detection function of an electrical resistor having a correlation between a resistance value and a temperature. When the heat of the thermistor heated by flowing current is taken away by the wind, the current is changed in order to maintain a constant temperature. However, there is one that measures the current speed as a function of the wind speed and measures the wind speed. Although this anemometer is suitable for measuring weak wind speeds, it is not suitable for wind speed measurement in strong winds. Moreover, although it is suitable for indoor use, it is not suitable for outdoor use because of its directivity.

  There is a need for an anemometer that can be used outdoors, has no directivity, is small and can be used easily, and can measure wind speeds of up to about 30 m / sec.

  A cylindrical inner cylinder with the zenith and the bottom not closed is coaxially inserted into a cylindrical outer cylinder without the bottom covered with the zenith, and a certain gap is provided between the outer cylinder and the inner cylinder. The inner cylinder is lowered by about 1 mm from the inside of the zenith of the outer cylinder, and when the lower end of the inner cylinder is arranged below the lower end of the outer cylinder, the inner cylinder is perpendicular to the axis of the cylinder. When wind is blown from the lateral direction, a pressure difference is generated between the pressure generated in the inner cylinder and the pressure generated in the gap between the inner surface of the outer cylinder and the outer surface of the inner cylinder, and an air flow is generated in the apparatus.

  By changing the diameter and height of the outer cylinder and inner cylinder, and their relative positions, and examining the relationship between the external wind speed and the speed of the air flow generated in the cylinder, the size and position of those cylinders Has been found to have a correlation between the wind speed from 0 m / sec to about 30 m / sec and the flow of air generated in the cylinder. If the combination is not appropriate, there will be a saturation phenomenon such as no air flow in the cylinder, or even if it occurs, it will peak at a low wind speed and the flow speed will not change even if the wind speed increases. It was.

  An air flow detector in which a heating element and a temperature sensor by electric resistance are integrated is installed at an appropriate position in the cylinder, for example, inside the zenith of the outer cylinder.

  When a constant current is passed through the heating element due to electrical resistance, the heating element becomes a constant temperature.However, when the size and positional relationship of the outer and inner cylinders are combined appropriately and wind is blown to the outside, the wind speed in the device is accordingly increased. As a result, an air flow that correlates with the air flow takes place, and the amount of heat is deprived, so that the temperature of the heating element changes according to the wind speed. The wind speed can be measured by converting the temperature change into the wind speed.

  The anemometer of the present invention is small and light with an outer diameter of about 2 cm and a height of about 5 cm and only lead wires coming out from it. Since it can be easily attached to various devices that require wind speed data without getting in the way, its utility value is high.

  In the cylindrical outer cylinder with a bottom of outer diameter of about 2 cm and a height of about 5 cm, where the zenith is closed, the cylindrical wall is a little thinner with a height of about 5 cm where the top and bottom are not closed. The inner cylinder is inserted coaxially, the zenith peripheral part of the inner cylinder is slightly lowered from the inside of the zenith part of the outer cylinder and a gap of about 1 mm is formed, and the lower end of the inner cylinder is about 2 mm below the lower end of the outer cylinder. There is a 0.5mm gap between the inner surface of the outer cylinder and the outer surface of the inner cylinder, and an air flow detector with an integrated heating element and temperature sensor is installed inside the outer cylinder. An anemometer.

  A specific embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing the concept of the anemometer of the present invention. In order to help understanding, a main part related to the present invention is a sectional view cut along a central axis. It is shown.

  The outer cylinder 1 has an outer diameter of 18 mm, an outer height of 60 mm, an inner diameter of 16 mm, an inner height of 50 mm, and a connector or the like is contained in a portion of about 10 mm of the zenith. A thick inner cylinder 2 having an outer diameter of 15 mm, an inner diameter of 2.5 mm, and a height of 51 mm is coaxially inserted inside the outer cylinder. Although not shown, the inner cylinder is fixed in the outer cylinder with an appropriate support.

  A gap of 0.5 mm is provided between the inner surface of the outer cylinder and the outer surface of the inner cylinder, and a gap of 1 mm is formed between the inner side of the outer cylinder zenith and the periphery of the inner cylinder zenith, and therefore the lower end of the inner cylinder. Is 2 mm below the lower end of the outer cylinder.

  An air flow detector 3 having a diameter of 5 mm and a height of 3 mm comprising an electric resistor and a temperature sensor is attached to the inner side of the outer cylinder zenith, and the inner cylinder center part corresponding to the air flow detector 3 is slightly depressed. At the time of measurement, a constant current is passed through the electric resistance to raise the temperature of the detector.

  Under the above conditions, the anemometer of the present invention was actually placed in the wind tunnel, the wind speed was changed, and the temperature of the air flow detector was measured. An example of the data is shown in FIG. The horizontal axis is the wind speed applied to the anemometer. The vertical axis represents the temperature of the detector. As shown in this graph, there is a certain correlation between the wind speed and the temperature of the detector, indicating that a wind speed of 0 to 30 m / sec can be measured with the anemometer of the present invention.

  An anemometer replaced with an air flow detector using a thermistor having a heat generation function and a temperature detection function of an electrical resistor having a correlation with a resistance value and a temperature instead of the air flow detector in the first embodiment. .

  As described above, since the anemometer of the present invention is small and light, it can be easily attached to various devices that require wind speed data without worrying about the location. And since the opening of this device is downward, it prevents rain and garbage. Accurate wind speed can be measured even in bad weather environments such as snowstorms. Since the temperature is slightly elevated, the possibility of snowfall is small. Long life because there are no moving parts.

The conceptual diagram of the anemometer of this invention. The main part is shown in cross section. The graph which shows the relationship between the temperature of an air detector, and a wind speed.

1. Outer cylinder Inner cylinder Air flow detector

Claims (3)

  This device has an outer diameter of about 2 cm without a bottom with a closed zenith, and a cylindrical cylinder with a height of about 5 cm, and a slightly thinner cylinder with a height of about 5 cm without a closed zenith and bottom. A cylindrical inner cylinder is inserted coaxially, the zenith portion of the inner cylinder is slightly lowered from the inner side of the zenith portion of the outer cylinder, and a gap of about 1 mm is formed, and the lower end of the inner cylinder is 0.5 from the lower end of the outer cylinder. ~ 2mm below, with a uniform spacing of 0.5 to 1.5mm between the inner surface of the outer cylinder and the outer surface of the inner cylinder, and the heating element and temperature sensor are integrated inside the outer cylinder. The air flow detector is installed and the heating element is heated, but when wind blows to the bottom of the outer cylinder and the inner cylinder, the pressure generated in the inner cylinder and the space between the inner cylinder and the outer cylinder Since there is a difference in the pressure generated in the air, air flows inside the device and takes heat away from the heating element. Regarded as a number, anemometer, characterized in that to measure wind speed.   The anemometer according to claim 1, wherein an electric resistance is used as a heating element of the air flow detector, and the temperature is raised by flowing a constant current.   As an air flow detector, use one that uses the heat generation function and temperature detection function of an electrical resistor that correlates with resistance value and temperature, and the current change as a function of the wind speed to keep the current constant by flowing current. The anemometer according to claim 1, wherein the anemometer is captured.

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