JPH11190740A - Anemometer and wind velocity measuring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anemometer and a wind velocity measuring method in which the wind velocity value can be grasped quantitatively through a simple constitution without converting the wind force into rotary force. SOLUTION: An anemometer comprises a spherical body 4 supported between first upper and lower wires 5a, 5b stretched vertically by a weight 7 movable only in the vertical direction through a regulation member 8, a displacement gauge 12 for measuring the ascending length of the weight 7 in the vertical direction when a wind W to be measured blows against the spherical body, and an operating section 13 for calculating the wind velocity value of wind W to be measured based on the ascending length.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anemometer and a wind speed measuring method.

[0002]

2. Description of the Related Art Conventionally, as an anemometer for measuring wind speed,
"Three cup anemometer" and "propeller anemometer" are known. A three-cup type anemometer (not shown) has arm members protruding horizontally at an angle of 120 degrees from a rotating shaft arranged in a vertical direction, and cups are respectively provided at the tips of the three arm members. It is configured by attaching a shape member.

Further, a propeller type anemometer (not shown)
A two- or three-blade propeller is attached to the tip of a rotating shaft arranged in the horizontal direction. In these anemometers, when the wind hits the cup-shaped member or the propeller, the rotating shaft rotates, and the rotating torque is used to rotate the generator to generate power, to measure the current value, voltage value, and the like. By counting the number of rotations, the rotation speed of the rotating shaft is measured, and the wind speed value is calculated based on the measured rotation speed.

[0004] For this reason, these anemometers are provided with a rotating mechanism for temporarily converting the force of the wind to a rotating force. However, in a cold region or the like, the rotating mechanism may freeze. In addition, if the rotating mechanism is used for a long period of time, rust may be generated on the rotating mechanism.

For this reason, there has been proposed a device capable of grasping the wind speed without converting the wind force into a rotational force once.
As such a wind speed measuring device, a device described in Japanese Utility Model Publication No. 58-51270 (hereinafter referred to as “device a”)
That. ), The device described in Japanese Patent Application Laid-Open No. Hei 4-145373 (hereinafter referred to as “device B”), and the device described in Japanese Utility Model Application Laid-Open No. Hei 5-84866 (hereinafter referred to as “device”).
It is called "device C." ) Are known.

[0006]

However, in the above-mentioned conventional devices A, B and C, the scales and the like are large, medium and medium.
Although it is only a qualitative index such as showing small, it is possible to qualitatively grasp wind power, but to measure wind speed accurately and quantitatively based on physical relationships etc. could not.

[0007] Further, in the above devices A, B and C,
The member receiving the wind is then free-vibrated to return to its original position, but there is no means to dampen this free vibration, and it is difficult to read accurate values due to this free vibration. There is a disadvantage that the accuracy of the measurement is further reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. An object of the present invention is to convert a wind speed into a quantitative value with a simple configuration without converting wind power into rotational force. It is an object of the present invention to provide an anemometer and wind speed measurement that can be grasped.

[0009]

To solve the above-mentioned problems, an anemometer according to the present invention comprises a sphere and two wires mounted coaxially with the axis of symmetry of the sphere, and one of the two wires is provided. Is fixed or horizontal movement is restricted, and a weight is attached to the other, and a restricting means for restricting the weight to move only in the vertical direction is provided, and the two wires are moved by the gravity of the weight. While being pulled in the vertical direction, the sphere is supported in the middle of the two wires, and the measured weight is measured based on the rising length of the weight in the vertical direction when the wind to be measured hits the sphere. A wind speed detecting means for detecting a wind speed value of the wind is provided.

In the above anemometer, preferably, the upper end of the first upper wire, which is one of the two wires, is fixed to a fixed point, and the lower end of the first upper wire is attached to the upper end of the sphere. The upper end of a first lower wire, which is the other of the two wires, is attached to the lower end of the sphere,
The horizontal movement is restrained below the lower wire, and the weight is attached below the restraint. The sphere is pulled vertically downward by the first lower wire, and the sphere is fixed to the fixed point by the first upper wire. From below.

In the above-described anemometer, preferably, the lower end of the second lower wire, which is one of the two wires, is fixed to a fixed point, and the upper end of the second lower wire is attached to the lower end of the sphere. The lower end of a second upper wire that is the other of the two wires is attached to the upper end of the sphere, the horizontal movement is restrained above the second upper wire, and the direction is reversed by a pulley above the restraining portion, The weight is attached to the lower end of the inverted wire, the sphere is pulled vertically downward by the second lower wire, and the second
The sphere is suspended vertically above by the upper wire.

In the anemometer described above, preferably, in the wind speed detecting means, the rising length is measured by a displacement meter.

In the above-described anemometer, preferably, the length between the fixed point or the restraining portion of the first wire and the second wire and the sphere is L, the rising length is h, and The deflection angle of the first wire or the second wire when the measurement wind hits the sphere is θ, the mass of the weight is m, the gravitational acceleration is g, the drag coefficient is C, and the density of air is ρ, the projected area of the sphere is A, and the wind speed value of the wind to be measured is v, the wind speed detecting means is:
The first equation is calculated from the above h by the following first equation h = 2 × L × (1−cos θ) / cos θ, and the calculated θ, the m, g, C, ρ, A, and the following second equation are calculated. v = [(2 × m × g × tan θ) / (C × ρ × A)]
^The above v is calculated by ^1/2 and detected.

The anemometer described above preferably further comprises alarm means for outputting alarm information when the wind speed value detected by the wind speed detecting means exceeds a predetermined alert value.

In the above-mentioned anemometer, preferably, there is provided a braking means for braking free vibration of the weight.

Further, according to the wind velocity measuring method of the present invention, two wires are attached to a sphere coaxially with an axis of symmetry, one of the two wires is fixed or horizontal movement is restricted, and a weight is attached to the other. The weight is restricted to be moved only in the vertical direction, the two wires are pulled in the vertical direction by the gravity of the weight, and the sphere is supported in the middle of the two wires to be measured. The method is characterized in that a wind speed value of the measured wind is calculated by measuring a vertical rising length of the weight when the wind hits the sphere.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the anemometer according to the present invention will be described below in detail with reference to the drawings.

(1) First Embodiment FIG. 1 is a perspective view showing a configuration of an anemometer according to a first embodiment of the present invention. FIG. 2 is a sectional view showing a more detailed configuration of the anemometer shown in FIG.

As shown in FIGS. 1 and 2, this anemometer 101
Are the lower housing 1, the top plate 2, and the support members 3a, 3b, 3
c, sphere 4, first upper wire 5a, first lower wire 5
b.

The support members 3a to 3c are erected on the lower housing 1, and the top plate 2 is supported by these support members 3a to 3c. The upper end of the first upper wire 5a is fixed to a point P1 on the lower surface of the top plate 2 (hereinafter, referred to as a "fixed point"). The lower end P2 of the first upper wire 5a
Is attached to a point on the surface of the sphere 4.

The sphere 4 may have a hollow or solid structure. The upper end of the first lower wire 5b is attached to a point P3 on the surface of the sphere that is symmetric with respect to the joining point P2 of the first upper wire 5a with respect to the center P5 of the sphere 4. Therefore, the straight line connecting the points P2 and P3 on the sphere 4 is coaxial with the symmetry axis of the sphere 4.

The first lower wire 5b is inserted into the lower housing 1 from the opening 10 of the lower housing 1 at a point P4 (hereinafter, referred to as a "restricted portion"), and is horizontally inserted at the edge of the opening 10. Are restrained from moving. As shown in FIG. 2, a weight 7 is attached to the lower end of the first lower wire 5b. A regulating member 8 is provided around the weight 7.
The regulating member 8 is a pipe-like member or a groove-like member that accommodates the weight 7, or a guide rail-like member that guides the side of the weight 7 in the vertical direction. The weight 7 is controlled by the regulating member 8.
Is regulated so that it can move only in the vertical direction.

A connecting member 17 is attached to a lower end of the weight 7. The connecting member 17 is provided in the through hole 1 of the partition wall 19a.
9b is inserted into the inner chamber 19a. Connecting member 17
A damper member 18 is attached to a lower end of the first member. The damper member 18 is housed in the inner chamber 19. A viscous liquid such as silicone oil is sealed inside the inner chamber 19. The through-hole 19 b is closed by a ring member or the like (not shown) so that the connecting member 17 is freely movable in the vertical direction and the sealed viscous liquid does not leak to the outside of the inner chamber 19. .

With the above configuration, the sphere 4 is pulled vertically downward by the first lower wire 5b due to the gravity of the weight 7, and the sphere 4 is vertically lowered from the fixed point P1 by the first upper wire 5a. Hanged on. In this way, the sphere 4 is supported between the first upper wire 5a and the first lower wire 5b, which are pulled in the vertical direction by the gravity of the weight 7. Further, in this case, the distance between the fixed point P1 and the point P2 is set to L, and the distance between the point P3 and the constraint part P4 is set to L.

In the vicinity of the first lower wire 5b in the lower housing 1, a displacement gauge 12 for measuring the amount of displacement in the vertical direction is provided. As the displacement meter 12, for example, a sensor or the like that irradiates the measured point 11 on the first lower wire 5b with light such as a laser beam and reads the displacement amount optically is used.

An operation section 13 is connected to the output side of the displacement meter 12. The calculation unit 13 is configured by a microcomputer or the like, and calculates the wind speed of the wind hitting the sphere 4 from the displacement amount of the first lower wire 5b detected by the displacement meter 12.

On the output side of the arithmetic section 13, a display section 14, an alarm section 15, and an output terminal 16 are connected. Display 14
Is composed of a liquid crystal display or the like, and displays the wind speed value calculated by the calculation unit 13 by a numeral. Further, the alarm unit 15 has a buzzer or the like, and generates an alarm sound when the wind speed value calculated by the calculation unit 13 exceeds a predetermined warning value. Also, the output terminal 16
Is connected to a host computer or the like, and sends a wind speed value calculated by the arithmetic unit 13 as data, or sends an alarm signal when the wind speed value exceeds a predetermined warning value.

Next, the operation of the anemometer 101 will be described with reference to FIG.

Assuming that the wind W to be measured blows horizontally from the left side to the right side of the figure as shown in FIG. 2 and hits the sphere 4, the sphere 4 moves in the upper right direction of the figure by wind pressure ( (See FIG. 3A). With the movement of the sphere 4, the point P2
Moves to the point P ', and the point P3 moves to the point P3'. By this movement, the first upper wire 5a swings to the right in the figure and tilts by an angle α, and the first lower wire 5b swings to the right in the figure and tilts by an angle θ. Also, due to this movement, the portion between the upper end P3 and the point P4 of the first lower wire 5b changes like the broken line between the point P3 'and the point P4.
The portion b in the lower housing 1 rises in the vertical direction of the figure by h (not shown), and the weight 7 is displaced vertically upward in FIG.

When the sphere 4 moves as shown in FIG. 3A, the length of the first upper wire 5a (the distance between the point P1 and the point P2 ') remains unchanged at L, but the length of the first lower wire 5b remains unchanged. Restraint part P
The distance between 4 and point P3 'increases to (L + h). Here, the point of intersection of the perpendicular drawn from the point P2 'to the straight line connecting the points P1 and P4 is point A, and the point of intersection of the perpendicular drawn from the point P3' is point B. In this case, the points P1, P2 'and A
And the following formulas (1) and (2) are established from the geometric relationship between the triangle connecting the points P4 and P3 'and the point B. L × cos α + (L + h) × cos θ = 2 × L (1) L × sin α = (L + h) × sin θ (2)

The mass of the weight 7 is m, and the mass of the sphere 4, the first upper wire 5a, the first lower wire 5b, the connecting member 17 and the damper member 18 is ignored, and the gravitational acceleration is g (=
9.80 m / sec ² ).
Assuming that the wind force applied to is f, the following equation (3) is established from the positional relationship shown in FIG. f / (m × g) = tan α (3)

On the other hand, the drag coefficient of the sphere against the flow of air is C, the density of the air is ρ, and the projected area of the sphere 4 is A
(= Πr ² ) and the wind speed of the wind W to be measured is v,
Since the wind force f applied to the sphere 4 from the measured wind W is equal to the resistance of the sphere 4 to the measured wind W, the following equation (4) is established. f = C × ρ × v ² × A / 2 (4)

The above equations (1), (2), (3),
In (4), since the values of L, r, m, g, C, ρ, and A are known and the rise length h is obtained by measurement, there are four unknowns θ, α, f, and v. Since the number of equations is 4, solving the above equations (1) to (4) as simultaneous equations gives
The values of θ, α, f, and v can be obtained.

In the above equations (1) to (4), if the mass m of the sphere 4 is set large, the deflection angle α of the first upper wire 5a and the deflection angle θ of the first lower wire 5b become very small. , Θ and α can be assumed to be equal. In such a case, the left side and the right side of the above equation (1) are each represented by L
And rearranging as α = θ, the following equation can be obtained: h = 2 × L × (1−cos θ) / cos θ (5), and this equation (5) is converted to the above equations (1), (1) 2)
Can be used instead of

Further, in the above equation (3), when α = θ,
The following equation f / (m × g) = tan θ (6) can be obtained, and this equation (6) can be used instead of the above equation (3).

By solving Equations (4), (5), and (6) as simultaneous equations, first, h is added to Equation (5).
By substituting the value of?, The value of? Can be obtained. Further, from equation (4) and equation (6), by eliminating f, m × g × tan θ = C × ρ × v ² × A / 2, and the following equation v = [(2 × m × g × tan θ) ) / (C × ρ × A)] ^1/2 (7) The wind velocity value v of the wind W to be measured can be calculated.
The calculation unit 13 calculates the wind speed value v of the wind W to be measured by the simultaneous equations (1) to (4) or the equations (5) and (7).
Is calculated.

Here, using the above equations (5), (6) and (7), L = 1 m, m = 10 kg, r = 0.1 m, ρ = 1.
When 225 kg / m ³ (value at 1 atm, 15 ° C., dry air) and drag coefficient C of the sphere are 0.5, the following calculation results are obtained.

B) When v = 10 m / sec, f = 0.96 N, θ = 0.56 °, h = 0.10 mm b) When v = 20 m / sec, f = 3.85 N, θ = 2.25 °, h = 1.54 mm c) When v = 50 m / sec f = 24.0 N, θ = 13.8 °, h = 59.1 mm

Therefore, the rising length h of the portion of the first lower wire 5b inside the lower housing 1 is not more than 10 cm even when the allowance is taken into consideration, and it is sufficient if the length of the regulating member 8 is set to 10 cm.

(2) Second Embodiment Next, a second embodiment of the present invention will be described. FIG.
FIG. 4 is a cross-sectional view illustrating a configuration of an anemometer according to a second embodiment of the present invention.

As shown in FIG. 4, the anemometer 102
Lower housing 1, upper housing 20, support members 3a, 3b,
3c, a spherical body 4, a second upper wire 5c, and a second lower wire 5d.

The supporting members 3a to 3c are erected on the lower housing 1, and the upper housing 20 is mounted on these supporting members 3a to 3c.
Supported by A lower end of the second lower wire 5d is fixed to a point (hereinafter, referred to as a “fixed point”) P6 on the upper surface of the lower housing 1. In addition, the second lower wire 5d
Is attached to a point on the surface of the sphere 4.

The configuration of the sphere 4 is the anemometer 1 of the first embodiment.
The same as in the case of 01. The lower end of the second upper wire 5c is attached to a point P8 on the surface of the sphere that is symmetrical with the joint P7 of the second lower wire 5d with respect to the center P5 of the sphere 4. Therefore, the straight line connecting the points P7 and P8 on the sphere 4 is coaxial with the symmetry axis of the sphere 4.

The second upper wire 5c is inserted through the opening 20a of the upper housing 20 into the inside of the upper housing 20 at a point P9 (hereinafter, referred to as a "constrained portion"), and horizontally at the edge of the opening 20a. Are restrained from moving. Upper housing 20
Are provided with pulleys 6a and 6b, and the upper part of the second upper wire 5c inserted into the upper casing 20 is turned vertically downward by the pulleys 6a and 6b. Is guided vertically downward from the other opening 20b at the point P
At the position 10, it is inserted through the opening 10 of the lower housing 1 into the lower housing 1. A weight 7 is attached to the insertion end of the second upper wire 5c. Hereinafter, the lower housing 1
The configuration inside is the same as that of the anemometer 101 of the first embodiment.

With such a configuration, the sphere 4 is lifted vertically upward by the second upper wire 5c due to the gravity of the weight 7, and the sphere 4 is pulled vertically downward by the second lower wire 5d. Thus, the sphere 4 is supported between the second upper wire 5c and the second lower wire 5d, which are pulled in the vertical direction by the gravity of the weight 7. In this case, the distance between the fixed point P6 and the point P7 is set to L, and the point P8
Is set to L.

The operation of the anemometer 102 of the second embodiment is the same as the operation of the anemometer 101 of the first embodiment.

That is, assuming that the measured wind W to be measured blows horizontally from the left side to the right side of the figure as shown in FIG. 4 and hits the sphere 4, the sphere 4 is moved downward and to the right by the wind pressure. Moving. With the movement of the sphere 4, the second upper wire 5
c, the second lower wire 5d swings to the right in the figure and tilts. Also,
Due to this movement, the portion of the second upper wire 5c inside the lower housing 1 rises by h (not shown) in the vertical direction in the figure. The displacement meter 12 measures a rising length h of a point to be measured 11 provided in a portion of the second upper wire 5c in the lower housing 1, and calculates the arithmetic unit 1
The calculation unit 13 calculates the wind speed value v from the rising length h, and outputs it to the display unit 14, the alarm unit 15, the output terminal 16, and the like.

However, in the anemometer 102 of the second embodiment, the deflection angle of the second upper wire 5c corresponds to the angle θ in the first embodiment, and the deflection angle of the second lower wire 5d is in the first embodiment. Corresponds to the angle α.

As described above, the anemometer 10 of the first embodiment
According to the anemometer 102 of the first or second embodiment, there are the following advantages. (A) Since there is no mechanism for converting wind power to rotational force, the configuration is simple, maintenance is easy, no failure due to freezing or rusting occurs, and the manufacturing cost is low. (B) The wind speed value can be grasped quantitatively. (C) Free vibration of the sphere 4 can be suppressed by the braking action of the damper member 18, so that measurement accuracy is high. (D) Since the measurement target wind W is configured to be received by the sphere 4, it is possible to detect the measurement target wind W from any direction.

In each of the above embodiments, the displacement meter 12
And the operation unit 13 constitute a wind speed detection unit. Also,
The alarm unit 15 corresponds to an alarm unit. The alarm sound and the alarm signal correspond to alarm information. Further, the regulating member 8 corresponds to a regulating means. Also, the damper member 18
And the viscous liquid in the inner chamber 19 constitutes a braking means.

The present invention is not limited to the above embodiments. Each of the above embodiments is merely an example, and has substantially the same configuration as the technical idea described in the claims of the present invention, and those having the same functions and effects are:
Anything is included in the technical scope of the present invention.

For example, in each of the above embodiments, an optical sensor has been described as an example of the displacement meter for measuring the ascending length of the wire rod. However, the present invention is not limited to this. For example, a displacement gauge of a dial gauge type may be used. When a dial gauge type displacement meter is used, the stylus portion is brought into contact with, for example, the upper surface or the lower surface of the weight 7 or a portion to be measured protruding from the wire, and the amount of movement of the stylus is detected. Further, a differential transformer may be used as another displacement meter. The differential transformer includes a primary coil, a secondary coil, and a movable iron core excited at a constant voltage and a constant frequency, and the displacement of the movable iron core is generated by an electromotive force induced in the secondary coil according to the position of the movable iron core. Is to measure.
In the case of using a differential transformer type displacement meter, the stylus portion is brought into contact with, for example, the upper surface or lower surface of the weight 7 or a portion to be measured protruding from the wire, and the amount of movement thereof is detected.

Also, contact sensors are arranged at predetermined angles at the upper edge of the inner wall of the opening 10 in the anemometer 101 of the first embodiment or at the lower edge of the inner wall of the opening 20a in the anemometer 102 of the second embodiment. In other words, when the wind to be measured blows, the wire (the first lower wire 5
b, in the anemometer 102, the second upper wire 5c) comes into contact with the inner wall in the leeward direction, whereby the wind direction can be grasped.

Further, the method is not limited to the method of suppressing the free vibration of the sphere 4 by the braking action between the damper member 18 in the inner chamber 19 and the viscous liquid, and another method may be adopted. For example, the weight 7 itself may be housed in a required room, a viscous liquid may be sealed in this room, and the free vibration of the sphere 4 may be suppressed by its braking action.

The display section may be of a type for displaying numerical values, or of a type for reading the angular position of a rotating pointer like a current meter or a voltmeter using a scale.

In the first and second embodiments described above, the operation unit 13 is calculated based on the rising length h measured by the displacement meter 12.
Has been described using an example of a device configured to calculate the wind speed value v. However, the present invention is not limited to this, and a switch (not shown) that is turned ON when the upper end of the weight 7 rises to a predetermined position. ), The alarm buzzer sounds, or a predetermined signal information (for example, a red signal) is posted on the alarm signal, so that the displacement meter and the operation unit are not required, and the configuration is further simplified. In this case, a switch that is turned on when the upper end of the weight 7 has risen to a predetermined position corresponds to a wind speed detecting unit.

When each wire is made of steel or the like,
Since the wire material expands and contracts depending on the temperature, an error occurs in the calculated wind speed value. Therefore, the calculation unit 13 may be configured to perform the correction calculation based on the temperature, or the calibration may be performed in the summer or winter. Good.

In the second embodiment described above,
Although the pulleys 6a and 6b are used, the number of pulleys may be one or three or more. The point is that the direction of the upper end of the second upper wire can be reversed in the direction of the weight.

[0059]

As described above, according to the present invention,
A sphere is supported in the middle of two wires that are pulled in the vertical direction by the gravity of the weight that can move only in the vertical direction, and is based on the vertical rise of the weight when the wind to be measured hits the sphere. In addition, since it has a wind speed detecting means for detecting the wind speed value of the wind to be measured, it has the following advantages. (1) There is no mechanism for converting wind power to rotational force, the configuration is simple, maintenance is easy, no failure due to freezing or rusting occurs, and the manufacturing cost is low. (2) The wind speed value can be grasped quantitatively. (3) Since the free vibration of the sphere can be suppressed by the damping action of the damper member or the like, the measurement accuracy is high. (4) Since the measured wind is received by a sphere, it can be detected regardless of the direction in which the measured wind blows.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of an anemometer according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a more detailed configuration of the anemometer shown in FIG.

FIG. 3 is a conceptual diagram illustrating the operation of the anemometer shown in FIG.

FIG. 4 is a cross-sectional view illustrating a configuration of an anemometer according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower housing 2 Top plate 3a-3c Support member 4 Sphere 5a 1st upper wire 5b 1st lower wire 5c 2nd upper wire 5d 2nd lower wire 6a, 6b Pulley 7 Weight 8 Restriction member 10 Opening 11 Measurement point DESCRIPTION OF SYMBOLS 12 Displacement meter 13 Operation part 14 Display part 15 Alarm part 16 Output terminal 17 Connecting member 18 Damper member 19 Inner chamber 19a Partition wall 19b Through hole 20 Upper housing 20a, 20b Opening 20c Internal space 101,102 Anemometer P1 Fixed point P4 Constraint Part P6 Fixed point P10 Restraint part

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiaki Imai 38-8 Hikaricho, Kokubunji-shi, Tokyo 38 Within Railway Technical Research Institute

Claims (8)

[Claims] 1. A sphere and two wires attached coaxially to the symmetry axis of the sphere, one of the two wires is fixed or horizontal movement is restricted and the other is attached with a weight, A regulating means for regulating the weight to move only in the vertical direction is provided, and the two wires are pulled in the vertical direction by the gravity of the weight,
The sphere is supported in the middle of the two wires, and the wind speed to be measured is detected based on the vertical rising length of the weight when the wind to be measured hits the sphere. An anemometer comprising wind speed detecting means. 2. The anemometer according to claim 1, wherein an upper end of a first upper wire, which is one of the two wires, is fixed to a fixed point, and a lower end of the first upper wire is attached to an upper end of the sphere. An upper end of a first lower wire, which is the other of the two wires, is attached to a lower end of the sphere, a horizontal movement is restrained below the first lower wire, and the weight is attached below a restraining portion, An anemometer wherein the sphere is pulled vertically downward by the first lower wire and the sphere is suspended vertically downward from the fixed point by the first upper wire. 3. The anemometer according to claim 1, wherein a lower end of a second lower wire, which is one of the two wires, is fixed to a fixed point, and an upper end of the second lower wire is attached to a lower end of the sphere. The lower end of a second upper wire that is the other of the two wires is attached to the upper end of the sphere, the horizontal movement is restrained above the second upper wire, and the direction is reversed by a pulley above the restraining portion, The weight is attached to the lower end of the inverted wire, and the sphere is pulled vertically downward by the second lower wire, and the sphere is lifted vertically upward by the second upper wire. Total. 4. The anemometer according to claim 1, wherein in the anemometer, the rising length is measured by a displacement meter. 5. The anemometer according to claim 1, wherein a length between a fixed point or a restraining portion of the first wire and the second wire and the sphere is L, the rising length is h, and The deflection angle of the first wire or the second wire when the measurement wind hits the sphere is θ, the mass of the weight is m, the gravitational acceleration is g, the drag coefficient is C, and the density of air is When ρ, the projected area of the sphere is A, and the wind speed value of the measured wind is v, the wind speed detecting means calculates the following equation: h = 2 × L × (1-cos θ) / cos θ The above θ is calculated from the above h, and the calculated θ, m, g, C, ρ, A and the following second formula v = [(2 × m × g × tan θ) / (C × ρ × A )]
An anemometer characterized in that said v is calculated by ^1/2 and detected. 6. The anemometer according to claim 1, further comprising an alarm unit that outputs alarm information when the wind speed value detected by the wind speed detection unit exceeds a predetermined warning value. Total. 7. The anemometer according to claim 1, further comprising braking means for braking free vibration of the weight. 8. A sphere is provided with two wires coaxially with the axis of symmetry, fixing one of the two wires or restraining horizontal movement and attaching a weight to the other, and moving the weight only in the vertical direction. When the weight of the weight pulls the two wires in the vertical direction and supports the sphere in the middle of the two wires, the wind to be measured hits the sphere. A wind speed measuring method, wherein a wind speed value of the wind to be measured is calculated by measuring a rising length of the weight in a vertical direction.