Wind speed and direction measurement sensor and wind speed and direction measurement device

Abstract

To provide a wind speed and direction measurement sensor and a wind speed and direction measurement device capable of measuring wind speed and wind direction with high reliability on the installation surface even when the measurement surface of the wind speed and direction is inclined.SOLUTION: The wind speed and direction measurement sensor includes: a wind receiving section 2 having a wind-receiving sphere 3, a contact portion 5 having a spherical and downward convex contact surface, and a connecting section 6 that connects the sphere and the contact section; and a pressure sensor 10 that has multiple pressure sensing parts 16 on a curved concave surface 9 in contact with the contact surface for detecting the pressure received by the wind receiving unit. The center of gravity 7 of the wind receiving unit coincides with the center of a virtual sphere 4 that includes the contact surface. The radius of each curvature R1, R2, R3 at multiple points from the bottom of the curved concave surface outward is larger than the radius R of the virtual sphere.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wind speed and direction measuring sensor and a wind speed and direction measuring device that use a pressure sensor to measure the wind speed and direction of airflow in a three-dimensional space. [Background technology]

[0002] In recent years, in the assembly and manufacturing process of various industrial products or home appliances, or in the device manufacturing process of various electronic components, various batteries, or substrates on which electronic components are mounted, which are components of these products, the heating devices, including heating furnaces and drying furnaces for heat treatment, have become more diverse, and their functions have been significantly improved. In addition, in the process of heating and drying the object by mainly applying hot air to the object to be heated and transferring heat from the hot air to the object, a large amount of thermal energy is consumed compared to other processes, so that improving the heating efficiency or drying efficiency to reduce energy consumption is a major issue, and therefore management of the setting conditions of the heating device is very important. In general, in the heating and drying process using hot air, the amount of air blown from the hot air blowing part of the heating device that generates hot air and applies it to the object to be heated is controlled by setting the rotation speed of the circulation fan that circulates the hot air within the device, and the blowing air speed is determined by balancing this with the opening area of ​​the hot air blowing part or the pressure loss and flow path loss of the circulation path within the device. In many cases, the wind speed at the hot air blowing section is measured using, for example, a vane type anemometer that calculates the wind speed of the airflow from the number of revolutions of an impeller installed at the tip of the measuring device, or a hot wire anemometer that calculates the wind speed of the airflow from the degree to which heat is taken from a hot wire by the airflow while heating it by passing an electric current through the hot wire, and is managed as a production process. In order to efficiently heat or cool an object by contacting the object with hot or cold air, the heat transfer coefficient between the fluid, such as hot or cold air, and the object to be heated is important. The speed and angle at which the fluid collides with the object are major factors in determining this heat transfer coefficient. In addition to heat transfer, it is also necessary to efficiently move the fluid near the interface between the fluid and the solid, not only in the transfer of heat, but also in the process of removing moisture from the surface of the object, such as drying the object. In this case, if the fluid is a general viscous fluid and, as an extreme example, the fluid flows parallel to the surface of the object, the flow speed of the fluid at the object surface will theoretically be zero. Thus, in processes such as heating, cooling, or drying an object, in addition to the flow rate of the fluid, the angle at the interface where the fluid comes into contact with the object to be heated is important.Therefore, when applying a fluid such as an airflow to an object in a process such as heating, cooling, or drying the object, in addition to managing the wind speed or volume of the hot air blowing section on the above-mentioned device side, it is necessary to take into account the heat transfer coefficient between the fluid and the heated object; for this reason, it is important to manage both the speed of the fluid and its angle relative to the heated object.

[0003] In response to this, in general, in order to control the wind conditions near the interface of the heated object to be heated, cooled, or dried, a small hot wire anemometer and a small thermometer are used in combination as a means of measuring the area near the interface, and the wind speed near the heated object is measured as much as possible.

[0004] However, the main purpose of a hot wire anemometer is to calculate wind speed, and because it is omnidirectional, it cannot identify the direction of fluid flow. Also, a vane anemometer detects wind speed from the rotation speed of the impeller at the tip of the measuring section, but in this case the wind direction is limited to the wind speed in the axial direction of the impeller that the vane anemometer impeller faces, and because the measuring device itself is large, it is difficult to measure the wind speed near the interface of a heated object, especially directly above the heated object.

[0005] For this reason, as a small-sized measuring device for measuring wind speed and direction directly above a heated object, a technique for measuring wind speed and direction using a pressure distribution sensor is known, for example, as disclosed in Patent Document 1.

[0006] Fig. 12 is an explanatory diagram of a conventional pressure sensor for measuring wind speed and direction described in Patent Document 1. In Patent Document 1, as shown in Fig. 12(A), an anemometer 60 includes a detection unit 61 that detects information about wind flow, and an identification unit 62 that identifies the wind speed and direction from the information detected by the detection unit 61.

[0007] The detection unit 61 includes a wind detection member 63 and a surface pressure distribution sheet 64 .

[0008] The wind detection member 63 has a wind receiving portion 65, a support portion 66, and a contact portion 67. The contact portion 67 has a plurality of protrusions 68 on the bottom surface. The contact portion 67 is formed, for example, in a substantially spherical shape with a portion missing. The contact portion 67 is connected to the end opposite the end on the wind receiving portion 65 side of the upper and lower ends of the support portion 66. The plurality of protrusions 68 on the bottom surface are the bottom surface of the wind detection member 63 and are the surface facing the surface pressure distribution sheet 64. The bottom surface of the contact portion 67 is formed in a spherical shape that is convex with respect to the surface pressure distribution sheet 64. The plurality of protrusions 68 are formed on the bottom surface of the contact portion 67. The plurality of protrusions 68 are parts of the contact portion 67 that directly contact the surface pressure distribution sheet 64. The plurality of protrusions 68 are arranged radially around the contact position with the surface pressure distribution sheet 64 in a windless state. Each of the protrusions 68 is provided at a position that is the lowest when the wind detection member 63 is in an inclined state in response to wind having a predetermined horizontal component. The wind detection member 63 is formed so that its center of gravity is located on the contact portion 67 side. The position of the center of gravity of the wind detection member 63 is set so that the wind detection member 63 can maintain an upright state (hereinafter referred to as the initial state) with the contact portion 67 facing downward and the wind receiving portion 65 facing upward in a state in which it is not subjected to external force. The position of the center of gravity of the wind detection member 63 is set so that when it receives wind, it tilts from the initial state by the magnitude of the wind speed, and returns to the initial state when the wind stops.

[0009] The surface pressure distribution sheet 64 is formed in a sheet shape and detects the distribution of the magnitude of the applied pressure. The surface pressure distribution sheet 64 can detect the amount of pressure applied to which position.

[0010] The determination unit 62, which determines the wind direction and wind speed of the wind detected by the detection unit 61, acquires pressure distribution information from a surface pressure distribution sheet 64. The magnitude and direction of the horizontal component of the wind speed vector are determined based on the acquired pressure distribution information. That is, the direction of the horizontal component can be determined by determining the radial direction in which the contact position is separated from the initial position, and the magnitude of the horizontal component can be determined by determining how far the contact position is separated from the initial position in the radial direction. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] JP 2019-74405 A Summary of the Invention [Problem to be solved by the invention]

[0012] However, in the configuration of Patent Document 1, it is considered that the movement due to a weak wind will return to the initial state, but if the detection unit 61 is significantly tilted by a strong wind, or if there is an element of rotation imparted by the wind and the contact parts 67 slip, it is considered that it will be difficult to return to the initial state when the wind stops. This is possible to some extent to suppress rotation or slippage by increasing the friction resistance with the material of the contact parts 67 or the material of the surface pressure distribution sheet 64, but it is difficult to completely avoid it. In other words, there is a possibility that the sensor will stop at a position other than the initial position when the wind stops, and therefore, when the sensor receives wind thereafter, the relationship between the contact position between the contact parts 67 and the surface pressure distribution sheet 64 and the wind speed and wind direction will be lost, making it difficult to accurately measure the wind speed and wind direction.

[0013] The present invention solves the above-mentioned problems of the conventional art, and aims to provide a wind speed and direction measuring sensor and device which can receive pressure from airflows from any three-dimensional direction in the same way, and which, in the process of receiving wind and operating, can return to its initial position when the influence of the wind disappears, accurately detect the influence of the wind thereafter, and accurately measure the strength and direction of pressure from the airflow. [Means for solving the problem]

[0014] In order to achieve the above object, a wind speed and direction measuring sensor according to one aspect of the present invention comprises: a wind receiving section including a sphere for receiving wind, a contact section having a spherical contact surface that is downwardly convex, and a connection section that connects the sphere and the contact section; a pressure sensor having a plurality of pressure sensing parts on a curved concave surface in contact with the contact surface, the pressure sensor detecting the pressure received by the wind receiving part; the center of gravity of the wind receiving portion coincides with the center of a virtual sphere including the contact surface, The radii of curvature at a plurality of points extending outward from the lowest portion of the curved concave surface are each greater than the radius of the imaginary sphere.

[0015] In order to achieve the above object, a wind speed and direction measuring device according to another aspect of the present invention comprises: The wind speed and direction measuring sensor according to the above aspect; A calculation unit is provided to calculate a wind speed and a wind direction based on a detection value from the pressure sensor, The calculation unit sets the position where the contact surface and the pressure sensitive part of the pressure sensor contact and the detection value of the pressure sensor as initial values ​​when there is no load due to the airflow on the wind receiving part, and calculates the wind speed and direction of the airflow based on the difference between the position where the contact surface of the wind receiving part contacts the pressure sensitive part of the pressure sensor, the detection value of the pressure sensor, and the initial value when a load due to the airflow is applied to the wind receiving part. Effect of the Invention

[0016] As described above, according to the wind speed and direction measuring sensor and the wind speed and direction measuring device of the present invention, the center of gravity of the wind receiving part coincides with the center of the virtual sphere including the contact surface, so that after operating due to the influence of the airflow, it can return to its initial state when the influence of the airflow disappears. Therefore, it is possible to accurately measure the influence of the airflow thereafter, and even if the airflow pressure is received from any three-dimensional direction in space, the wind receiving part receives the wind on the sphere, so that the force can be received evenly, and it is possible to measure the pressure of the airflow from above as a pressing force on the sphere, and the pressure of the airflow from below as a buoyancy force on the sphere. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is an explanatory diagram of a wind speed and direction measuring device including a wind speed and direction measuring sensor according to a first embodiment of the present invention. [Diagram 2] FIG. 1 is a perspective view of a wind speed and direction measuring device according to a first embodiment of the present invention. [Diagram 3] FIG. 1 is an explanatory diagram of a pressure-sensitive part of a pressure distribution sensor according to a first embodiment of the present invention; [Figure 4] FIG. 1 is an explanatory diagram of the shape of a pressure distribution sensor according to a first embodiment of the present invention; [Diagram 5] FIG. 1 is an explanatory diagram of the shape of a pressure distribution sensor according to a first embodiment of the present invention; [Figure 6] An explanatory diagram of a wind speed and direction measuring device under pressure of air flow [Figure 7] An explanatory diagram of a wind speed and direction measuring device with the airflow pressure removed. [Figure 8] An illustration of the effect of airflow direction on a wind speed and direction measuring device [Figure 9] FIG. 10 is an explanatory diagram of a wind speed and direction measuring device according to a second embodiment of the present invention. [Figure 10] FIG. 10 is an explanatory diagram of a wind speed and direction measuring device according to a third embodiment of the present invention. [Figure 11] FIG. 11 is an explanatory diagram of a wind speed and direction measuring device according to a fourth embodiment of the present invention. [Figure 12] Diagram of a conventional wind speed measurement sensor DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] (Embodiment) FIG. 1 is an explanatory diagram of a wind speed and direction measuring device 1 including a wind speed and direction measuring sensor 51 according to a first embodiment of the present invention.

[0020] The wind speed and direction measuring sensor 51 includes at least a wind receiving section 2 and a pressure sensor 10. The wind speed and direction measuring sensor 51 may further include a sensor base 8 as shown in FIG.

[0021] The wind speed and direction measuring device 1 includes a wind speed and direction measuring sensor 51 and a calculation unit 50.

[0022] The wind-receiving section 2 receives the pressure of the airflow and comprises a sphere 3 for receiving the wind, a contact section 5 whose contact surface is spherical and convex downwards, and a connection section 6 made of, for example, a cylindrical support, which connects the sphere 3 and the contact section 5 so that their respective central axes coincide and pass through the center of gravity 7 of the wind-receiving section 2. The connection section 6 is intended to prevent the sphere 3 from contacting the cover section 12 that covers the upper surface of the sensor base 8 during measurement, and as an example, the axial length of the connection section 6 is shorter than the diameter of the sphere 3, and the width direction length of the connection section 6 perpendicular to the axial direction is shorter than the diameter of the sphere 3.

[0023] The weights and shapes of the wind-receiving sphere 3, the contact portion 5 and the connection portion 6 are adjusted so that the center of gravity 7 of the wind-receiving portion 2 coincides with and overlaps with the center of the imaginary sphere 4 including the contact surface.

[0024] The pressure sensor 10 has a plurality of pressure sensing parts 16 that detect the pressure received by the wind receiving part 2 in a curved concave part 9, which is an example of a curved concave surface that contacts the contact surface of the contact part 5. The concave part 9 has a spherical curved concave surface shape or a curved concave surface shape having a plurality of radii of curvature.

[0025] Regarding the shape of the concave portion 9, the radius of curvature at multiple points from the bottom of the concave portion 9 toward the outside is larger than the radius of the virtual sphere 4. Furthermore, in order to more reliably achieve the desired operation and effect, the angle of the normal to the horizontal plane at each of the multiple points is made larger toward the outside. These will be described in detail later.

[0026] The sensor base 8 has a concave portion 9 that is recessed and curved downwards on the surface facing the wind receiving section 2, and a pressure distribution sensor 10, an example of a pressure sensor, is installed on the surface of the concave portion 9. Details of the structure of the pressure distribution sensor 10 regarding pressure detection will be described later. The contact portion 5 contacts the pressure distribution sensor 10 at the contact surface 11. Furthermore, if the concave portion 9 can be formed by the pressure distribution sensor 10 even without the sensor base 8, the sensor base 8 can be omitted.

[0027] A cover part 12 may be provided to prevent the contact part 5 from being directly exposed to wind, and the sensor base 8 and cover part 12 surround the contact part 5 in a swingable manner. When not receiving airflow pressure, the contact surface 11 of the wind-receiving part 2 is in contact with the pressure distribution sensor 10 at the bottom of the concave part 9 (hereinafter, this state will be referred to as the initial state).

[0028] Figure 2 shows a perspective view of the wind speed and direction measuring device in embodiment 1 of the present invention. Figure 2(A) is a perspective view of the entire wind speed and direction measuring device, and Figure 2(B) is a perspective view of the concave portion 9 of the sensor base 8 and the pressure distribution sensor 10 arranged in the concave portion 9. As shown in Figure 2(A), the configuration is such that only the wind-receiving sphere 3 and a part of the connection part 6 are exposed from the cover part 12 and the sensor base 8 so that the airflow mainly strikes the wind-receiving sphere 3 of the wind-receiving part 2.

[0029] FIG. 3 is an explanatory diagram of the pressure-sensitive part of the pressure distribution sensor 10 in the first embodiment of the present invention, and shows an example of a typical configuration of the pressure distribution sensor 10. Linear electrodes 14 are arranged in parallel at regular intervals on the sheet 13, and a pressure-sensitive conductive material 15 whose electrical resistance value changes when pressure is applied is arranged so as to cover the surface of the electrodes 14. Another pair of sheets with a similar combination is prepared, and the pair of sheets 13 are overlapped so that the electrodes 14 cross each other to form the pressure distribution sensor 10 (see FIG. 3(A)). The overlapping portion of the electrodes 14 of the pair of sheets 13 becomes a pressure-sensitive measuring part 16 as an example of a pressure-sensitive part (see FIG. 3(B)). When pressure is applied to the pressure-sensitive measuring part 16, the pressure-sensitive conductive material 15 is compressed, and the electrical resistance of the pressure-sensitive conductive material 15 changes depending on the strength of the pressure, and the calculation part 50 calculates the applied pressure in the pressure-sensitive measuring part 16 from the change in the electrical resistance value. As a result, the calculation part 50 derives the position where the pressure is applied and the value of the pressure at that position. Furthermore, the resolution in pressure detection is determined by the distances X and Y between the adjacent pressure sensitive measuring units 16 .

[0030] The calculation unit 50 is connected to all the pressure sensitive measuring units 16 and calculates the wind speed and wind direction based on the detection values ​​from the pressure sensitive measuring units 16. For example, the calculation unit 50 calculates the amount and direction of pressure of the airflow 17, i.e., the wind speed and wind direction, based on the total sum of the detection values ​​of the pressure sensitive measuring units 16 and the detection values ​​of each pressure sensitive measuring unit 16. Note that the calculation unit 50 may be omitted in the following figures.

[0031] Here, as a condition for the wind-receiving section 2 to perform the desired operation when it is affected by an airflow, i.e., to operate due to the influence of the airflow and then return to its initial state when the influence of the airflow is eliminated, the relationship between the shapes of the contact surface 11 of the contact part 5 and the pressure distribution sensor 10 is such that, in one vertical cross section passing through the center of gravity 7, the radii of curvature at multiple points from the bottom of the concave-shaped section 9 toward the outside are each greater than the radius R of the imaginary sphere 4. Furthermore, in order to more reliably achieve the desired operation, the angle of the normal to the horizontal plane at each of these multiple points may be made to increase toward the outside.

[0032] Specifically, the following two cases will be explained: when the concave portion 9 is configured as a part of a sphere as shown in FIG. 4 (when the radius, i.e., the radius of curvature, is the same regardless of location), and when the concave portion 9 is not part of a sphere as shown in FIG. 5, but has a different radius depending on location.

[0033] FIG. 4 is an explanatory diagram of the shape of the pressure distribution sensor in the first embodiment of the present invention. FIG. 4 shows a case where the concave portion 9 on which the pressure distribution sensor 10 is arranged has a shape consisting of a part of a sphere. In this case, the relationship between the shape of the contact surface 11 of the contact portion 5 and the pressure distribution sensor 10 will be described as a condition for the wind receiving portion 2 to perform a desired operation when the wind receiving portion 2 is affected by an airflow. In the case of one vertical section passing through the center of gravity 7 in FIG. 4, if the radius of the contact surface 11, that is, the radius from the center of the virtual sphere 4 is R, and the radii at a plurality of arbitrary points P11, P12 of the concave portion 9 of the pressure distribution sensor 10, which is configured as a shape consisting of a part of a sphere as described above, in other words, the radii of curvature, are R11 and R12 from the bottom of the pressure distribution sensor 10 outward, then within the range where the contact surface 11 and the pressure distribution sensor 10 contact each other, R <R11、R<R12 In addition, since the surface is spherical, the radii of curvature at arbitrary points P11 and P12 are the same, i.e., R11 = R12, and if the angles of the normals to the horizontal plane at points P11 and P12 are θ11 and θ12, respectively, then, since the surface is spherical, θ11 < θ12, and the conditions for more reliably achieving the desired operation are also satisfied.

[0034] In the initial state where there is no influence of airflow, the contact position between the contact surface 11 of the contact portion 5 and the pressure distribution sensor 10 is the lowermost part of the pressure distribution sensor 10, which has a shape consisting of a part of a sphere.

[0035] Under this condition, namely R < R11 and R < R12, the contact surface 11 and the pressure distribution sensor 10 are always in point contact at any point. Also, no matter how the contact part 5 moves due to the strength or direction of the air flow, when the influence of the air flow pressure disappears, it can return to the position at the bottom of the pressure distribution sensor 10.

[0036] Figure 5 is another explanatory view of the shape of the pressure distribution sensor in Embodiment 1 of the present invention. Different from the case of Figure 4, it is an explanatory view of the case where the concave-shaped part 9 where the pressure distribution sensor 10 is arranged is not a part of a spherical surface but a curved concave-shaped part with different radii depending on the location. The relationship between the shapes of the pressure distribution sensor 10 and the contact surface 11 of the contact part 5 at this time only needs to satisfy the following conditions within the range where the contact surface 11 and the pressure distribution sensor 10 are in contact. That is, in one longitudinal section passing through the centroid 7, the radius of curvature of any point of the concave-shaped part 9 of the pressure distribution sensor 10 is always larger than the radius from the center of the virtual sphere 4, and the inclination angle of the normal line with respect to the horizontal plane increases as it goes from the bottom of the pressure distribution sensor 10 to the outside. When this condition is explained in one longitudinal section passing through the centroid 7 of Figure 5, let the radius from the center of the virtual sphere 4 be R, and the radii of curvature at any points P1, P2, P3 of the concave-shaped part 9 of the pressure distribution sensor 10 be R1, R2, R3 from the bottom of the pressure distribution sensor 10 to the outside, then R < R1, R < R2, R < R3 only needs to be satisfied.

[0037] Under this condition, the contact surface 11 and the pressure distribution sensor 10 are always in point contact at any point. Also, no matter how the contact part 5 moves due to the strength or direction of the air flow, when the influence of the air flow pressure disappears, it can return to the position at the bottom of the pressure distribution sensor 10.

[0038] Furthermore, in order to more surely achieve the desired operation, when the angles of the normal lines with respect to the horizontal plane at the respective points P1, P2, P3 are θ1, θ2, θ3, then θ1 < θ2 < θ3 only needs to be satisfied.

[0039] FIG. 6 is an explanatory diagram of the wind speed and direction measuring device when it is subjected to the pressure of an airflow. FIG. 6(A) is a partial cross-sectional side view of the entire wind speed and direction measuring device, and FIG. 6(B) is an explanatory diagram of the position of the contact point 55 with respect to the pressure distribution sensor 10 arranged in the concave portion 9. When the pressure of the airflow 17 along the horizontal direction is applied to the wind-receiving sphere 3, the wind-receiving portion 2 tilts in the direction opposite to the direction of the airflow 17, and the contact portion 5 also tilts, so that the contact point 55 between the contact surface 11 of the contact portion 5 and the pressure distribution sensor 10 moves. The direction and strength of the airflow pressure can be determined univocally by the calculation portion 50 based on the position of the moved contact point 55 and the pressure detection value at the contact point 55. It is desirable that the coefficient of friction between the contact surface 11 and the pressure distribution sensor 10 be as large as possible.

[0040] FIG. 7 is an explanatory diagram of the wind speed and direction measuring device in a state where the pressure of the airflow is removed. FIG. 7(A) is a partial cross-sectional side view of the entire wind speed and direction measuring device, and FIG. 7(B) is an explanatory diagram of the position of the contact point 55 with respect to the pressure distribution sensor 10 arranged in the concave portion 9. In FIG. 6, when the contact point 55 between the contact surface 11 and the pressure distribution sensor 10 moves due to the influence of the airflow, if there is no slippage or rotation between the contact surface 11 and the pressure distribution sensor 10, the wind receiving part 2 will return to the lowest position of the pressure distribution sensor 10, i.e., the initial state, when the pressure of the airflow is removed. However, the contact surface 11 and the pressure distribution sensor 10 are not fixed so as not to hinder the movement of the wind receiving part 2 as much as possible, and therefore, there is a possibility that rotation or lateral slippage will occur at the contact point due to a change in the direction in which the force of the airflow is received. In that case, when the pressure of the airflow is removed and the wind receiving part 2 returns to the lowest position of the pressure distribution sensor 10, the central axis of the wind receiving part 2 may tilt as shown in FIG. 7(A), which may differ from the initial state.

[0041] However, in this embodiment, the weight and shape of the wind-receiving sphere 3, contact portion 5, and connection portion 6 are adjusted so that the center of gravity 7 of the wind-receiving portion 2 overlaps with the center of the virtual sphere 4, and therefore even if the central axis of the wind-receiving portion 2 is tilted, when the wind-receiving portion 2 returns to the bottommost position of the pressure distribution sensor 10, the position of the center of gravity 7 of the wind-receiving portion 2 will be the same as in the initial state. Moreover, since the contact portion 5 is part of the virtual sphere 4, the contact portion 5 comes into contact with the bottommost part of the pressure distribution sensor 10, and the pressure detection value received from the wind-receiving portion 2 does not change from the original state.

[0042] Figure 8 is an explanatory diagram of the influence of air current direction on the wind speed and direction measuring device. Figure 8(A) is an explanatory diagram when air current 17 is applied diagonally upward from the horizontal plane. When air current pressure 18 due to air current 17 in the diagonal upward direction is applied to the wind-receiving sphere 3, a force is applied to the wind-receiving sphere 3 in a direction that makes it float above the horizontal plane. As a result, a force is applied to the entire wind-receiving part 2 in a direction that makes it float above the horizontal plane, and the weight of the wind-receiving part 2 acts in a direction that reduces it by the vertical component 19 of the buoyancy.

[0043] Similarly, Fig. 8(B) is an explanatory diagram of the case where pressure 18 due to airflow 17 is applied diagonally downward. When pressure 18 due to airflow 17 in a diagonally downward direction is applied to wind-receiving sphere 3, a force is applied to wind-receiving sphere 3 in a direction pressing it against the horizontal plane. As a result, a force is applied to the entire wind-receiving section 2 in a direction pressing it against the horizontal plane, and the weight of wind-receiving section 2 acts in a direction that is added by the vertical component 20 of the pressing force. In this way, depending on the state of the airflow from three-dimensional directions, it becomes possible for the calculation section 50 to uniquely determine the wind speed and direction of the airflow.

[0044] FIG. 9 is an explanatory diagram of a wind speed and direction measuring device according to a second embodiment of the present invention. As one of the means for increasing the sensitivity to airflow, the shape of the wind-receiving sphere 3 is made relatively large. In FIG. 1, the shape of the wind-receiving sphere 3 is contained within the imaginary sphere 4, but even if the shape of the wind-receiving sphere 3 is not contained within the imaginary sphere 4 as in FIG. 9, as long as the center of gravity 7 of the wind-receiving part 2 and the center of the imaginary sphere 4 coincide with each other, the desired operating function can be performed without any problems. In the case of FIG. 9, by using a lightweight material such as polystyrene foam or a hollow sphere for the wind-receiving sphere 3, the position of the center of gravity 7 of the wind-receiving part 2 can be made the same position as the center of the imaginary sphere 4.

[0045] Fig. 10 is an explanatory diagram of a wind speed and direction measuring device according to a third embodiment of the present invention. In Fig. 10, the wind-receiving sphere 3 has a hollow structure, and is connected to the contact part 5 and the connection part 6 inside the hollow structure. In this case, if the center of gravity 7 of the wind-receiving part 2 including the wind-receiving sphere 3 and the center of the virtual sphere 4 are the same, the desired operating function will work without any problems. In the case of the configuration of Fig. 10, by additionally using the base plate 21 and the base support 22, it is possible to include the sensor base 8 inside the hollow structure of the wind-receiving sphere 3. In this case, the airflow will not directly affect the contact part 5, and therefore no means for preventing the airflow from directly hitting the contact part 5 is required.

[0046] Fig. 11 is an explanatory diagram of a wind speed and direction measuring device in embodiment 4 of the present invention. Originally, a cover part 12 is installed in a structure for measuring the direction and strength of the pressure of the airflow received by the wind-receiving sphere 3, but there is a gap between the connection part 6 and the cover part 12 to ensure the range of motion of the wind-receiving part 2, and there is a possibility that the airflow will hit the contact part 5 directly from the gap, affecting the pressure value and wind direction. For this reason, the contact part 5 is made of a mesh-like material while maintaining the shape of the contact surface 11, which is a part of the virtual sphere 4. This makes it possible to reduce the effect of the airflow that hits the contact part 5 directly.

[0047] In addition, by appropriately combining any of the various embodiments or modifications described above, it is possible to achieve the effects of each of them. In addition, combinations of embodiments, combinations of examples, or combinations of embodiments and examples are possible, and combinations of features of different embodiments or examples are also possible.

[0048] (Additional Note) The above description of the embodiments discloses the following techniques.

[0049] (Technical 1) A wind-receiving part including a sphere for receiving wind, a contact part having a spherical contact surface that is convex downward, and a connection part that connects the sphere and the contact part; a pressure sensor having a plurality of pressure sensing parts on a curved concave surface in contact with the contact surface, the pressure sensor detecting the pressure received by the wind receiving part; the center of gravity of the wind receiving portion coincides with the center of a virtual sphere including the contact surface, A wind speed and direction measurement sensor, wherein the radius of curvature at a plurality of points extending outward from the bottom of the curved concave surface is each greater than the radius of the virtual sphere.

[0050] (Technology 2) The wind speed and direction measuring sensor according to Technology 1, wherein an angle of the normal to each of the plurality of points with respect to a horizontal plane increases toward the outside.

[0051] (Technology 3) The wind speed and direction measuring sensor according to Technology 1 or 2, wherein the pressure sensitive portion of the pressure sensor is disposed approximately uniformly within the curved concave surface.

[0052] (Technology 4) The wind speed and direction measuring sensor according to any one of Technologies 1 to 3, wherein the pressure sensitive portion of the pressure sensor measures only pressure in a direction perpendicular to the curved concave surface.

[0053] (Technology 5) A wind speed and direction measuring sensor according to any one of Technologies 1 to 4, wherein the contact portion of the wind receiving portion with which the multiple pressure sensitive portions of the pressure sensor are in contact is mesh-shaped.

[0054] (Technology 6) The wind speed and direction measuring sensor according to any one of techniques 1 to 5; A calculation unit is provided for calculating a wind speed and a wind direction based on a detection value from the pressure sensor, The calculation unit sets the position where the contact surface and the pressure sensitive part of the pressure sensor and the detection value of the pressure sensitive sensor as initial values ​​when there is no load due to airflow on the wind receiving part, and calculates the wind speed and direction of the airflow based on the difference between the position where the contact surface of the wind receiving part and the pressure sensitive part of the pressure sensor and the detection value of the pressure sensitive sensor and the initial value when a load due to airflow is applied to the wind receiving part.

[0055] According to each of these configurations, the center of gravity of the wind-receiving part coincides with the center of a virtual sphere including the contact surface, so that after it operates under the influence of the airflow, it can return to its initial state when the influence of the airflow disappears. Therefore, it is possible to accurately measure the influence of the airflow thereafter, and since the wind-receiving part receives the airflow as a sphere, the force can be received evenly regardless of the direction of the airflow pressure in the three dimensions in space, and it is possible to measure the airflow pressure from above as a pressing force on the sphere, and the airflow pressure from below as a buoyancy force on the sphere. [Industrial Applicability]

[0056] In the wind speed and direction measuring sensor and the wind speed and direction measuring device according to the above aspect of the present invention, the center of gravity of the wind receiving part coincides with the center of a virtual sphere including the contact surface, and therefore, after operating due to the influence of the airflow, the sensor and the wind speed and direction measuring device can return to the initial state when the influence of the airflow disappears. Therefore, the influence of the airflow can be accurately measured thereafter. As a result, even in a situation where the wind speed and angle of the airflow applied to the object changes from moment to moment, it is possible to specify the wind speed and wind direction with respect to the surface of the object, particularly near the interface between the airflow and the object. Therefore, the above aspect of the present invention can be applied to heat treatment equipment that performs various heat treatments, such as drying ovens, curing ovens, and reflow ovens, in the manufacturing process of industrial products or home appliances or the manufacturing process of various electronic components, as a wind speed and direction measuring sensor and a wind speed and direction measuring device that manage the heat transfer coefficient between the airflow and the object, which is important in the heating and cooling process of the object, and manage the flow of the airflow near the interface of the object in the drying process of the object. [Explanation of symbols]

[0057] 1 Wind speed and direction measuring device 2 Wind receiving section 3. Wind-receiving sphere 4 Virtual sphere 5 Contact area 6 Connection 7 Center of gravity 8 Sensor base 9 Concave portion 10 Pressure distribution sensor 11 Contact surface 12 Cover part 13 sheets 14 electrodes 15 Pressure-sensitive conductive materials 16 Pressure sensing unit 17 Airflow 18 Pressure due to air flow 19 Vertical component of buoyancy 20 Vertical component of pressing force 21 Base plate 22 Base support 50 Arithmetic section 51 Wind speed and direction measurement sensor 55 Contacts 60 Anemometer 61 Detection unit 62 Specific part 63 Wind detection member 64 Surface pressure distribution sheet 65 Wind receiving section 66 Pillar section 67 Contact Part 68 Protrusion

Claims

1. a wind receiving section including a sphere for receiving wind, a contact section having a spherical contact surface that is downwardly convex, and a connection section that connects the sphere and the contact section; a pressure sensor having a plurality of pressure sensing parts on a curved concave surface in contact with the contact surface, the pressure sensor detecting the pressure received by the wind receiving part; the center of gravity of the wind receiving portion coincides with the center of a virtual sphere including the contact surface, A wind speed and direction measurement sensor, wherein the radius of curvature at a plurality of points extending outward from the bottom of the curved concave surface is each greater than the radius of the virtual sphere.

2. The wind speed and direction measurement sensor according to claim 1 , wherein an angle of a normal to each of the plurality of points with respect to a horizontal plane increases toward an outside.

3. 3. The wind speed and direction measuring sensor according to claim 1, wherein the pressure sensitive portion of the pressure sensitive sensor is disposed approximately uniformly within the curved concave surface.

4. 3. The wind speed and direction measuring sensor according to claim 1, wherein the pressure sensitive portion of the pressure sensor measures only pressure in a direction perpendicular to the curved concave surface.

5. 3. The wind speed and direction measuring sensor according to claim 1, wherein the contact portion of the wind receiving portion with which the pressure sensitive portions of the pressure sensor are in contact is in a mesh shape.

6. The wind speed and direction measuring sensor according to claim 1 or 2; A calculation unit is provided to calculate a wind speed and a wind direction based on a detection value from the pressure sensor, The calculation unit sets the position where the contact surface and the pressure sensitive part of the pressure sensor and the detection value of the pressure sensitive sensor as initial values ​​when there is no load due to airflow on the wind receiving part, and calculates the wind speed and direction of the airflow based on the difference between the position where the contact surface of the wind receiving part and the pressure sensitive part of the pressure sensor and the detection value of the pressure sensitive sensor and the initial value when a load due to airflow is applied to the wind receiving part.

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