JPS602625B2 - Wind speed measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wind speed measuring device that measures the average wind speed inside a duct or the like.

Conventionally, the average wind speed inside a duct has been measured using a hot-wire type anemometer that can measure only one point, measuring at several locations at the location to be measured, and calculating the measured values by averaging them.

This conventional method averages measured values at several locations, which has disadvantages such as poor reproducibility and measurement accuracy, and is time-consuming.

The present invention aims to eliminate these drawbacks of the conventional devices and provides a device that can accurately measure the average wind speed in a duct or the like in a short time. An embodiment of the present invention will be described below based on FIGS. 1 to 3.
That is, in FIGS. 1 to 3, 1 is a movable electrode bag for distributing grain in a duct (not shown), 2 is a fixed electrode mount installed at a certain distance downwind of the movable electrode device 1, and 11"
21 is a mounting frame having mounting holes 111 and 211 for mounting on a duct; 12 is a movable electrode made of a metal pongee wire that is electrically insulated from the mounting frame 11 and stretched in a lattice shape and is deflected by wind; 22 is a mounting frame; A fixed electrode made of a metal pongee wire that is electrically insulated in the frame 21 and stretched in a grid shape having the same shape as the movable electrode 12, and has a strength that does not bend due to wind force.
Reference numerals 13 and 23 indicate connection lead wires that are electrically insulated from the mounting frames 11 and 21 and commonly connect one end of each of the electrodes 12 and 22. Reference numerals 14 and 24 indicate output leads that are connected to the connection lead wires 13 and 23. The wire 25 is a temperature-compensating thermal wire that is electrically insulated and installed on the leeward side of the center of the electrode stretched in one direction among the fixed electrodes 22 in order to eliminate measurement errors due to temperature changes inside the duct. A pair, 31 is a detection unit composed of a movable tortoise hawk 1, a fixed electrode device 2, and a thermal fin pair 25, and 32 is a constant between each output lead wire 14, 24 of the movable electrode device 1 and fixed electrode device 2. A constant current source 33 is a movable electrode 1 for supplying and transmitting a sinusoidal current of a frequency, and a movable electrode 1
2 and the fixed crab pole 22, a voltage change detection unit 34 detects a voltage change due to a change in capacitance; 34 is a voltage change detection unit 33;
35 is a temperature compensation unit 34 which compensates for the influence of temperature change on the output signal of the thermocouple 25 by the output signal of the thermocouple 25.
A signal processing section 36 processes the output signal of the signal processing section 35 into a signal proportional to the average wind speed, and a display section 36 displays the output signal of the signal processing section 35 as an average wind speed value.

With this configuration, when a sine wave current of a constant frequency is supplied between the movable electrode device 1 and the fixed electrode device 2 from the constant current source 32, the movable electrode 12 is deflected by the wind force according to the wind speed. , when approaching the fixed electrode 22 disposed opposite thereto, a voltage change detection unit 33 detects a voltage change between the electrodes 12 and 22 due to a change in capacitance corresponding to the wind speed.

However, the output signal of the voltage change detection section 33 includes errors due to temperature changes within the duct. Therefore, by utilizing the fact that the electromotive force of the thermocouple changes depending on the temperature, the temperature compensator 34 compensates for the influence of temperature. This temperature compensator 34
The signal processing unit 35 processes the output signal into a signal proportional to the average wind speed, and the display unit 36 displays the average wind speed value. In addition,
In the above embodiment, temperature compensation was performed by the temperature compensator 34, but this temperature compensation is unnecessary when the device is used at a constant temperature.

As described above, the wind speed measuring device according to the present invention has a movable electrode that is deflected by wind force and a fixed electrode that is not deflected, which are stretched across a ventilation section, and the wind speed is measured by the change in capacitance between the two electrodes. This allows wind speed to be measured accurately and in a short time.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention; FIGS. 1 and 2 are front views of main parts, and FIG. 3 is a block diagram. In the figure, 1 is a movable electrode device, 2 is a fixed electrode device, 11, 2
1 is a mounting frame, 12 is a movable electrode, 22 is a fixed electrode, 13,
23 is a connection lead wire, 14 and 24 are output lead wires, 25
3 is a thermocouple, 31 is a detection section, 32 is a constant current source, 33 is a voltage change detection section, 34 is a temperature compensation section, 35 is a signal processing section, 3
6 is a display section. Figure IL Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. A movable electrode stretched over a ventilation section and deflected by wind force, a fixed electrode placed opposite the movable electrode at a predetermined distance and not deflected by wind force, and a distance between the two electrodes depending on the wind speed. A wind speed measurement device is a device that detects changes in capacitance. 2. The wind speed measuring device according to claim 4, wherein the movable electrode is arranged upwind of the fixed electrode. 3. The wind speed measuring device according to claim 1 or 2, wherein the fixed electrode is provided with a device for compensating for errors in measuring wind speed due to changes in wind temperature.