Wind speed measurement teaching aid

Abstract

The utility model discloses a wind speed measurement teaching aid. The wind speed measurement teaching aid comprises an air outlet device, a sensor and a measuring device, the air outlet device is provided with a plurality of air outlet gears, the air outlet device is suitable for discharging air in the first direction, the sensor is arranged on the outer side of the air outlet device, and the sensor and the air outlet device are spaced by a preset distance in the second direction; the wind speed of the sensor on one side of the second direction is larger than that of the sensor on the other side of the second direction so as to change the electrical parameters of the sensor, and the measuring device is electrically connected with the sensor and used for measuring the electrical parameters of the sensor. When the air outlet device discharges air, the electric parameters of the sensor are changed under the action of pressure difference generated by air speed difference of two sides of the sensor, the electric parameters of the sensor can be measured through the measuring device to calibrate and measure the air speed, the air speed measurement teaching aid is convenient to demonstrate and operate, the measurement result is visual, and the understanding of audiences on the Bernoulli principle can be enhanced. The teaching effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of teaching tools, in particular to a wind speed measurement teaching tool. Background Art

[0002] In related technologies, many lower grade students have a vague understanding of wind speed and only subjectively feel the wind speed through the cool feeling brought by the wind and the movement of objects caused by the wind. Although some anemometers can directly measure wind speed in a digital way, their effect for teaching demonstrations is poor and students find it difficult to understand the principle of measuring wind speed. Therefore, it is necessary to design a teaching aid that can use physical principles to intuitively measure wind speed. Utility Model Content

[0003] The utility model aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, the utility model provides a wind speed measurement teaching aid, which can intuitively measure wind speed using the Bernoulli principle and improve teaching effects.

[0004] According to the wind speed measurement teaching aid of the embodiment of the utility model, it includes: an air outlet device, the air outlet device has multiple air outlet gears, and the air outlet device is suitable for discharging air in a first direction; a sensor, the sensor is arranged on the outside of the air outlet device, and the sensor and the air outlet device are separated by a preset distance in the second direction. When the air outlet device discharges air, the wind speed of the sensor on one side of the second direction is greater than the wind speed of the sensor on the other side of the second direction, so as to change the electrical parameters of the sensor, wherein the second direction is perpendicular to the first direction; a measuring device, the measuring device is electrically connected to the sensor, and the measuring device is used to measure the electrical parameters of the sensor.

[0005] According to the wind speed measurement teaching aid of the embodiment of the utility model, the air outlet device has multiple air outlet gears. When the air outlet device discharges air, the sensor changes its own electrical parameters under the pressure difference caused by the wind speed difference on both sides thereof. The electrical parameters of the sensor can be measured by the measuring device to calibrate and measure the wind speed. The wind speed measurement teaching aid is easy to demonstrate and operate, and the measurement results are intuitive, which can enhance the audience's understanding of the Bernoulli principle and improve the teaching effect.

[0006] According to some embodiments of the utility model, the wind speed measurement teaching aid further includes a wind speed detection device, and the wind speed detection device is used to detect the wind speed of the air outlet device.

[0007] According to some embodiments of the present invention, the sensor is configured as a strip structure.

[0008] According to some embodiments of the utility model, the wind speed measurement teaching aid further includes: a display sheet, in the second direction, the display sheet is located on a side of the sensor close to the air outlet device and is in contact with the sensor.

[0009] According to some embodiments of the utility model, the air outlet device includes an air outlet portion and an air regulating portion, the air outlet portion is used to discharge air to the air regulating portion, the air regulating portion includes an air outlet, and the air outlet area of ​​the air outlet is adjustable.

[0010] According to some embodiments of the present invention, the air outlet device is an electric fan.

[0011] According to some embodiments of the present invention, the sensor is a bending sensor.

[0012] According to some embodiments of the present invention, the measuring device is a multimeter.

[0013] According to some embodiments of the present invention, the measuring device is an Arduino controller.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of a wind speed measurement teaching aid according to an embodiment of the utility model;

[0016] Figure 2 It is a line graph of the corresponding relationship between the air outlet position and the air outlet wind speed;

[0017] Figure 3 It is a line graph of the corresponding relationship between the air outlet position and the sensor resistance.

[0018] Reference numerals:

[0019] Air outlet device 1, sensor 2, measuring device 3, display sheet 4, wind speed measurement teaching aid 10. DETAILED DESCRIPTION

[0020] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0022] Combine the following Figure 1-Figure 3 The wind speed measurement teaching aid 10 according to the embodiment of the present utility model is described in detail.

[0023] Reference Figure 1 As shown, the wind speed measurement teaching aid 10 includes: an air outlet device 1, a sensor 2 and a measuring device 3. The air outlet device 1 has multiple air outlet gears. The air outlet device 1 is suitable for discharging air in a first direction. The air outlet device 1 has different air outlet speeds at each air outlet gear. The air outlet speed can be changed by adjusting the air outlet gear of the air outlet device 1.

[0024] The sensor 2 is arranged on the outside of the air outlet device 1, and the sensor 2 and the air outlet device 1 are spaced apart by a preset distance in the second direction. When the air outlet device 1 discharges air, the wind speed of the sensor 2 on one side of the second direction is greater than the wind speed of the sensor 2 on the other side of the second direction, so as to change the electrical parameters of the sensor 2, wherein the second direction is perpendicular to the first direction. It can be understood that when the air outlet device 1 discharges air, the air outlet device 1 forms a wind field in the first direction, and the preset distance between the sensor 2 and the air outlet device 1 in the second direction can be 1cm to 10cm, that is, the sensor 2 is located outside the edge of the wind field, the wind speed of the sensor 2 on the side close to the wind field in the second direction is larger, and the wind speed of the sensor 2 on the other side away from the wind field in the second direction is smaller. Therefore, the wind speeds on both sides of the sensor 2 in the second direction are different, the side with a larger wind speed is subjected to a smaller pressure, and the side with a smaller wind speed is subjected to a larger pressure. The sensor 2 can convert the pressure changes on both sides thereof into electrical parameters, and the measuring device 3 is electrically connected to the sensor 2, and the measuring device 3 is used to measure the electrical parameters of the sensor 2. Therefore, the wind speed can be calibrated and measured according to the changes in the electrical parameters of the sensor 2.

[0025] It can be understood that when the air outlet device 1 is in different air outlet gears, the wind speed difference on both sides of the sensor 2 in the second direction is different, and the pressure on both sides of the sensor 2 in the second direction is also different. The pressure change on both sides of the sensor 2 in the second direction can change its electrical parameters, and the change in pressure is positively correlated or negatively correlated with the change in electrical parameters. The electrical parameters of the sensor 2 can be measured by the measuring device 3 to calibrate and measure the wind speed.

[0026] For example, the electrical parameter is a resistance value, and the air outlet device 1 has two air outlet positions of 5m / s and 7m / s. When the air outlet device 1 is not discharging air, the sensor 2 is not subjected to force in the second direction, and the measuring device 3 detects that the resistance of the sensor 2 is greater than 2000Ω. When the air outlet device 1 is discharging air at the air outlet position of 5m / s, the sensor 2 is subjected to a force Fa approaching the wind field under the influence of the wind speed difference on both sides in the second direction. At this time, the measuring device 3 detects that the resistance of the sensor 2 is between 210Ω and 250Ω. When the air outlet device 1 is discharging air at the air outlet position of 7m / s, the sensor 2 is subjected to a force Fb approaching the wind field under the influence of the wind speed difference on both sides in the second direction, and the force Fb is greater than the force Fa. At this time, the measuring device 3 detects that the resistance of the sensor 2 is between 98Ω and 103Ω. Thus, the correspondence between the resistance of the sensor 2 and the air outlet position can be calibrated and recorded. When the air outlet device 1 is turned on and adjusted to any air outlet position, the resistance value of the sensor 2 can be measured by the measuring device 3 to determine the air outlet position of the air outlet device 1 according to the resistance value. For example, when the resistance value of the sensor 2 measured by the measuring device 3 is 210Ω~250Ω, it can be determined that the air outlet device 1 is discharging air at the air outlet position of 5m / s.

[0027] It can be understood that the sensor 2 is located outside the wind field formed by the wind outlet device 1. The sensor 2 converts the pressure change formed by the wind speed difference on both sides of the second direction into an electrical parameter that is easy to measure accurately. The sensor 2 uses the Bernoulli principle to measure the wind speed. The wind speed measurement teaching aid 10 can enhance the audience's understanding of the Bernoulli principle. The wind speed measurement teaching aid 10 has a simple structure and is easy to operate. The demonstration results are reproducible. The wind speed measurement teaching aid 10 can be demonstrated by the teacher and then operated by the audience to enhance the audience's hands-on ability and cultivate the audience's scientific quality. The audience can be students, science and technology museum visitors, etc.

[0028] According to the wind speed measurement teaching aid 10 of the embodiment of the utility model, the air outlet device 1 has multiple air outlet gears. When the air outlet device 1 discharges air, the sensor 2 changes its own electrical parameters under the pressure difference caused by the wind speed difference on both sides thereof. The electrical parameters of the sensor 2 can be measured by the measuring device 3 to calibrate and measure the wind speed. The wind speed measurement teaching aid 10 is easy to demonstrate and operate, and the measurement results are intuitive, which can enhance the audience's understanding of the Bernoulli principle and improve the teaching effect.

[0029] In some embodiments of the utility model, the air outlet device 1 also includes a wind speed detection device, which is used to detect the air outlet speed of the air outlet device 1. The wind speed detection device can be a handheld thermal anemometer. The probe of the wind speed detection device can be placed at the air outlet of the air outlet device 1. The wind speed detection device can directly measure the air outlet speed of the air outlet device 1, and display the specific wind speed value through the screen of the wind speed detection device. The wind speed detection device can be used to measure the wind speed of each gear of the air outlet device 1. When measuring the air outlet speed of each gear of the air outlet device 1, the electrical parameters of the sensor 2 can be recorded at the same time to obtain the corresponding relationship between the air outlet speed and the electrical parameters. The corresponding relationship between the air outlet speed and the electrical parameters can be made into a table for recording. Therefore, after closing or removing the wind speed detection device, the electrical parameters of the sensor 2 can be read by the measuring device 3, and the air outlet speed corresponding to the electrical parameters can be obtained by looking up the table, thereby realizing the measurement of the wind speed.

[0030] In some embodiments of the present invention, referring to Figure 1 As shown, the sensor 2 is constructed as a strip structure, which has a small rigidity and is easy to deform. When the air outlet device 1 discharges air, in the second direction, the sensor 2 can bend toward the side with a larger wind speed under the action of the pressure difference on both sides of the second direction. When the wind speed of the air outlet device 1 is higher, the bending degree of the sensor 2 is greater. The deformation of the sensor 2 can be used to demonstrate the Bernoulli principle, realize the intuitive visualization of the wind speed, and thus enhance the audience's cognitive effect of the Bernoulli principle. Optionally, to ensure the bending amplitude of the sensor 2, the lower end of the sensor 2 can be fixed to the ground, and the upper end of the sensor can move freely.

[0031] In some embodiments of the present invention, referring to Figure 1 As shown, the wind speed measurement teaching aid 10 also includes: a visible sheet 4. In the second direction, the visible sheet 4 is located on the side of the sensor 2 close to the air outlet device 1 and is in contact with the sensor 2. When the air outlet device 1 discharges air, the visible sheet 4 bends toward the side with a larger wind speed under the action of the pressure difference on both sides of the second direction. The greater the wind speed of the air outlet device 1, the greater the bending degree of the visible sheet 4. The visible sheet 4 can intuitively display the force condition of the sensor 2 to realize the visualization of the wind speed and enhance the demonstration effect of the wind speed measurement teaching aid 10.

[0032] In addition, the visible sheet 4 can extend along the first direction, and the thickness of the visible sheet 4 in the second direction is less than 1mm. The visible sheet 4 is a thin sheet structure, and when the air outlet device 1 discharges air, the visible sheet 4 is subjected to a small force of wind in the first direction. The visible sheet 4 can provide a certain support effect for the sensor 2, reduce the force on the sensor 2 in the first direction, enhance the stability of the sensor 2, and avoid the bending of the sensor 2 in the first direction to affect the electrical parameters, so that it is beneficial to improve the measurement accuracy of the wind speed measurement teaching aid 10 for the wind speed. Optionally, the visible sheet 4 can be a cardboard, one end of the visible sheet 4 is a fixed end suitable for fixed connection with the ground, and the other end is a free end, and the visible sheet 4 is suitable for supporting and fixing the sensor 2.

[0033] In some embodiments of the utility model, the air outlet device 1 includes an air outlet portion and an air regulating portion, the air outlet portion is used to discharge air to the air regulating portion, the air regulating portion includes an air outlet, and the air outlet area of ​​the air outlet is adjustable, and the air outlet position of the air outlet device 1 can be adjusted by changing the air outlet area of ​​the air outlet, wherein the wind pressure provided by the air outlet portion can be constant, and the air outlet area can be adjusted by changing the size of the air outlet, thereby realizing the adjustment of the air outlet position.

[0034] In some embodiments of the present invention, the air outlet of the air regulating unit is provided with a rotatable or movable air guide strip, and the air outlet area of ​​the air outlet can be changed by rotating or moving the air guide strip.

[0035] In some embodiments of the utility model, the air outlet device 1 is an electric fan, and the air outlet speed of each air outlet gear of the electric fan is constant to ensure the reproducibility of the calibration and detection of the wind speed measurement teaching aid 10, and the electric fan is convenient to adjust the air outlet gear, which is convenient for demonstration operation.

[0036] In some embodiments of the utility model, the sensor 2 is a bending sensor. When the air outlet device 1 discharges air, the wind speeds on both sides of the bending sensor in the second direction are different. The wind speed on the side of the bending sensor close to the wind field in the second direction is larger, and the wind speed on the other side of the bending sensor far away from the wind field in the second direction is smaller. The side with large wind speed is subjected to smaller pressure, and the side with small wind speed is subjected to larger pressure. The bending sensor can bend toward the side with large wind speed under the action of the pressure difference on both sides of the second direction. When the wind speed of the air outlet device 1 is larger, the bending degree of the bending sensor is larger. At the same time, the bending degree of the bending sensor is positively correlated or negatively correlated with its electrical parameters, so that the wind speed can be calibrated and measured by measuring the electrical parameters of the bending sensor.

[0037] In some embodiments of the utility model, the bending sensor is a resistive bending sensor, the electrical parameter of the bending sensor is the resistance value, the bending sensor includes a film and a parallel electrode layer, when the bending sensor is bent and deformed by an external force, the film is deformed, and the degree of bending is identified by measuring the resistance change between the parallel electrode layers.

[0038] In other embodiments of the present invention, the bending sensor is a capacitive bending sensor, the electrical parameter of the bending sensor is a capacitance value, the bending sensor includes a film and a parallel electrode layer, when the bending sensor is bent and deformed by an external force, the film is deformed, and the degree of bending is identified by measuring the capacitance change between the parallel electrode layers.

[0039] In some embodiments of the present invention, the measuring device 3 is a multimeter, which is electrically connected to the sensor 2 , and the electrical parameters of the sensor 2 can be accurately measured by the multimeter.

[0040] In other embodiments of the utility model, the measuring device 3 is an Arduino controller, which can measure and record the electrical parameters of the sensor 2. In addition, the Arduino controller can be programmed. When the wind speed is calibrated, after the Arduino controller detects the electrical parameters of the current sensor 2, the current wind speed can be input to the Arduino controller, so that the Arduino controller records the corresponding relationship between the wind speed and the electrical parameters. When measuring the wind speed, the Arduino controller can directly control the display device to display the wind speed corresponding to the electrical parameters of the current sensor 2 according to the corresponding relationship between the electrical parameters of the current sensor 2 and the calibration.

[0041] In a specific embodiment of the utility model, the air outlet device 1 is an air circulation electric fan with 32 gears, and the air outlet speed is between 0.90m / s and 7.10m / s. Sensor 2 is a resistive bending sensor, the size of sensor 2 is 195mm×8mm×0.4mm, the resistance of sensor 2 in an unbent horizontal state is 25kΩ, the resistance error is 20%, the power is 0.5W, the peak value is 1W, the number of uses of sensor 2 is greater than 1 million times, the operating temperature range is -15℃~60℃, and the bending range is 0°~90°. The measuring device 3 is a digital multimeter, which can measure and display the resistance value of sensor 2 in real time. The wind speed detector is a handheld thermal anemometer to measure the wind outlet speed of the air outlet device 1. The specific demonstration process of the wind speed measurement teaching aid 10 is as follows:

[0042] Step S1, calibrating the wind speed of each air outlet gear of the air outlet device 1 by using a wind speed detector.

[0043] Specifically, the probe of the wind speed detection device is placed at the air outlet of the air outlet device 1, the air outlet gear of the air outlet device 1 is adjusted, and the air outlet wind speed directly measured by the wind speed detector at each air outlet gear is recorded in Table 1.

[0044] Table 1, gear position-wind speed calibration table:

[0045]

[0046] You can make a corresponding line chart based on the data in Table 1, refer to Figure 2 As shown, the air outlet position and air outlet speed are in a linear relationship, with some positions fluctuating. Analysis may be due to two reasons: 1) the air outlet position changes the design of a nonlinear relationship, such as sleeping wind, which has been proven correct by several measurements; 2) measurement errors within a certain range. However, this does not affect the subsequent experiments.

[0047] Step S2, calibrating the electrical parameters of the sensor 2 at each air outlet gear position of the air outlet device 1 by means of the measuring device 3.

[0048] Specifically, the air outlet position of the air outlet device 1 is adjusted, and the resistance value of the bending sensor measured by the measuring device 3 at each air outlet position is recorded in Table 2.

[0049] Table 2, gear position-resistance calibration table:

[0050] Air outlet position Resistance(Ω) Air outlet position Resistance (Ω) Air outlet position Resistance (Ω) 1～16 ＞2000 22 130～140 28 100～105 17 700～2000 23 125～140 29 98～103 18 500～800 24 125～130 30 91～93 19 200～300 25 120～130 31 83～86 20 210～250 26 120～125 32 78～80 21 170～200 27 110～120

[0051] Among them, during the demonstration, when the air outlet gear is between gear 1 and gear 16, the bending sensor has no obvious bending angle. Starting from gear 17, the smaller the wind speed, the larger the resistance fluctuation range, and the larger the wind speed, the more stable the resistance display. The corresponding line graph can be made according to the data in Table 2. Figure 3 As shown, the air outlet position is negatively correlated with the resistance, and it can be concluded that when the air outlet position is greater than 16, that is, when the air outlet speed is above 3.9 m / s, the bending sensor begins to bend. After the bending sensor begins to bend, the resistance drops rapidly. When the air outlet speed reaches above 4.6 m / s, the relationship between the air outlet speed and the resistance tends to be stable. It can be used to explore gas and liquid velocity measurement, or on this basis, if it is a uniform cross-section, the fluid flow rate can be measured.

[0052] Step S3, adjust the air outlet gear to any gear, measure the electrical parameters of the sensor 2 at the air outlet gear by the measuring device 3, and determine the current air outlet gear and air outlet speed of the air outlet device 1 according to the calibration relationship between the electrical parameters and the air outlet gear and the air outlet speed.

[0053] For example, when the resistance value of the bending sensor measured by the measuring device 3 is greater than 2000Ω, it can be determined that the air outlet gear is 1 to 16, and the air outlet wind speed is less than 3.9m / s. For another example, when the resistance value of the bending sensor measured by the measuring device 3 is 85Ω, it can be determined that the air outlet gear is 31, and the air outlet wind speed is 7.15m / s. For another example, when the resistance value of the bending sensor measured by the measuring device 3 is 101Ω, it can be determined that the air outlet gear is 28 or 29, and the air outlet wind speed is between 6.74m / s and 7.00m / s.

[0054] In step 3, audience members A and B can perform the operation. Audience member A directly controls the air outlet position of the air outlet device 1. Without knowing the current air outlet position of the air outlet device 1, audience member B measures the resistance value of the bending sensor through the measuring device 3 and determines the current air outlet position of the air outlet device 1 according to the measured resistance value. Audience member B then speaks out the determined air outlet position and verifies it with audience member A, thereby enhancing the audience's sense of participation and strengthening the teaching effect of the wind speed measurement teaching aid 10.

[0055] The wind speed measurement teaching aid 10 according to the embodiment of the utility model has a simple structure and is easy to operate, and the sensor 2 can measure the wind speed outside the wind field (without facing the air outlet), which can allow the audience to have a deeper understanding of the Bernoulli principle and cultivate the scientific quality of the audience.

[0056] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A wind speed measurement teaching aid, characterized in that: include: An air outlet device, the air outlet device having a plurality of air outlet gears, and the air outlet device is suitable for discharging air in a first direction; A sensor, wherein the sensor is arranged outside the air outlet device, and the sensor and the air outlet device are spaced apart by a preset distance in a second direction, and when the air outlet device is blowing air, the wind speed of the sensor on one side of the second direction is greater than the wind speed of the sensor on the other side of the second direction, so as to change the electrical parameters of the sensor, wherein the second direction is perpendicular to the first direction, and the sensor is a bending sensor; A measuring device is electrically connected to the sensor and is used to measure an electrical parameter of the sensor.

2. The wind speed measurement teaching aid according to claim 1, characterized in that: It also includes a wind speed detection device, which is used to detect the wind speed of the air outlet device.

3. The wind speed measurement teaching aid according to claim 1, characterized in that: The sensor is configured as a strip structure.

4. The wind speed measurement teaching aid according to any one of claims 1 to 3, characterized in that: Also includes: The visible sheet is located on a side of the sensor close to the air outlet device and is in contact with the sensor in the second direction.

5. The wind speed measurement teaching aid according to claim 1, characterized in that: The air outlet device includes an air outlet portion and an air regulating portion. The air outlet portion is used to discharge air to the air regulating portion. The air regulating portion includes an air outlet, and the air outlet area of ​​the air outlet is adjustable.

6. The wind speed measurement teaching aid according to claim 1, characterized in that: The air outlet device is an electric fan.

7. The wind speed measurement teaching aid according to claim 1, characterized in that: The measuring device is a multimeter.

8. The wind speed measurement teaching aid according to claim 1, characterized in that: The measuring device is an Arduino controller.

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