JP3363318B2 - Anti-frost method using anti-frost fan with swinging device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting method using a defrosting fan having a swinging device.

[0002]

2. Description of the Related Art As is well known, a frost-prevention fan (frost-prevention fan) is a simple and low-cost method (frost-prevention method) for preventing frost-frost damage in fields such as tea shavings, mulberry stalks, orchards, which may cause frost damage. There is a method using the device. Its general configuration is
It is as follows. That is, one defrosting fan capable of swinging horizontally is provided on the building pillar, and the depression angle of the defrosting fan with respect to the ground surface is about 15 ° to about 50 ° (as an example). It is a device that blows down the warm air of the inversion layer onto the ground surface of the field by utilizing the horizontal swing of the frost fan and the depression angle of the anti-frost fan. The anti-frost area will be described with reference to FIGS.

The environment settings for this example (an example of an experiment using our product) and the embodiment of the present invention are as follows.

Location: Kira-cho, Hazu-gun, Aichi Date: April 14, 1996 Time: Temperature sensor position based on AM 5:30 AM: 10000m behind the fan wind blowing direction
m Air temperature: -3 ° C (1000mm above ground) Leaf temperature: -4.5 ° C Fan model (our product); DFC710 blade diameter: 700mm Fan motor output: 980W Swing motor input: 30W (reduction ratio = 1/2000) Swing angle: approx. 90 ° Building length: 8000mm Building height (ground height): 6700mm Fan center: 6860mm

In this conventional example (according to an experiment using our product), as shown in the installation plan view of FIG.
0 ° swing (This is an example of an experimental example. In addition, in our company, other swing angles include about 60 °, about 75 °, about 120 °, “below, about omitted.”). However, as shown in the swing angular velocity waveform diagram of FIG. 21, in this experimental example, the vicinity of 0 ° (hereinafter, the vicinity is omitted) and the vicinity of 90 ° (hereinafter, right and left ends) are slow, and the center (45 °). Is faster, and as a result, a continuous waveform having just a mountain shape (oscillating sine waveform) is formed. The time required to repeat this waveform (swing) is about 38 seconds. FIG. 22 is a plan view showing the arrival distance of wind caused by this swinging motion (movement).
As shown in the plan view of the wind reach distance, the wind reach distance is a flat fan-shaped wind reach distance in which the right and left ends are long and 45 ° is shorter than the right and left ends, and there is a tendency for the wind reach distance to decrease at 45 °. I understand. Considering the influence (adverse effect) of this decreasing tendency on the anti-frost effect, as shown in FIG.
It can be seen that the anti-frost effect in the 45 ° direction is not sufficient.
Fig. 25 is a drawing comparing the distance traveled by wind with the swing angle.
In this figure, the reduction of the wind arrival distance at 45 ° (having a concave shape) is clearly shown. Incidentally, FIG. 24 is a diagram which can be understood that the above-mentioned frost prevention effect in the 45 ° direction is not sufficient.
The anti-frost effect in the 45 ° direction is concave. Therefore, in order to prevent frost from forming in the recessed field (which is referred to as a recessed field), it is necessary to install an anti-frost fan also in the recessed field. Assuming that a large number of anti-frost fans are installed in a virtual field based on this result, assuming that the field is 3800 m ² as shown in the frost prevention effect imaginary plan view of FIG. 26,
The frost-prevention effect area of one frost-prevention fan is about 242 m ² (the numerical value of the experimental example; the same applies below), but the number of overlapping frost-prevention fans is very large. 35 units. That is, in this conventional example, the overlapping area (S) is 242 m ² × 35 units-3800 m ² = 46.
It is 70 m ² , and the reason why there is a large number of overlapping areas (S) is the reason why it is impossible to efficiently blow air.

On the other hand, as related prior art documents, (1)
Examples include Japanese Examined Patent Publication No. 3-62920 intended to reach warm air in the perspective, and (2) Japanese Unexamined Patent Publication No. 6-93996 equipped with a control circuit for controlling a horizontal swing / swing stop mechanism. First, the invention of (1) is a drive device for an anti-frost fan, which is provided with a rocking base that is horizontally swingable on a mount and a defrosting fan that is provided on this rocking platform so that the depression angle can be adjusted. Motor, a motor base that controls the swing of the motor and the motor base that is provided on the swing base, and a mechanism that controls the forward and backward movement of the motor base. The angle of depression of the frost fan can be changed, and the horizontal swing mechanism enables horizontal swing. As a result, the reaching distance of warm air in the direction of the reciprocating path of the anti-frost fan is set to be near. Next, the invention of (2) is a fan and a method for controlling the head swing of the fan. In the left and right swing operation, the position at which the head of the fan is facing when the operation unit is operated is detected, and the detected position is detected. Is a fan provided with a control circuit for stopping the left and right swing motions for a predetermined time, and by stopping the left and right swing motions at a desired position for a predetermined time, the amount of air blown in a desired direction is increased and the comfort is improved. It is to improve the sex.

[0007]

With the method of swinging the swinging apparatus and the time described above in detail, it is impossible to establish a sufficient defrosting effect area shape by the method of ensuring the wind reach distance in all the directions of the field. In addition, there is a problem that the number of anti-frost fans cannot be expected to decrease.

In the invention of (1), the frost-proof effect area can surely be expanded. However, the arrival of warm air to a distant place is instantaneous, and the arrival of this warm air is different depending on the outward route and the return route (the arrival of the warm air differs between the outward route and the return route because the depression angle is different. ), Etc., there is a problem that the effect of the expansion is not sufficient and that the reduction in the number of anti-frost fans according to the present invention is still insufficient.

In the invention of (2), since the swinging motion is stopped at a desired position for a predetermined time, it is possible to expect an increase in the amount of air blown at this position. However, it is not intended to expand the wind reach distance, reduce the number of anti-frost fans installed, or stop (fix) at a predetermined position. Therefore, the object and technical contents are different from those of the present invention intended to expand the wind arrival distance at a predetermined position and reduce the number of anti-frost fans installed.

[0010]

In view of the above, the present invention provides
To reduce the number of frost-prevention fans in the field, expand the frost-prevention effect area in the same field, and save energy and cost, the following configurations are adopted. In addition, the present invention secures an expanded anti-frost effect area by securing downwind wind in the fixed direction at the stop position / time .
Or swinging motion of the swinging device and horizontal swing
Use the stop for a certain time at the center position of the swing motion to
Establishing a frost-proof area by securing downwind, and
Is a square-shaped planer with a ridge in the field.
Intended to establish a frost effect area, etc.

The present invention, warm air by using the frost fan with a head-shaking device installed in the field, Tokoro air, the wind gas such as
Blowdown at a constant angle of depression, a frost process can be ensured frost effect area of generally square shape in planar shape, this
With the horizontal swing motion of the swing device, you can move to this swing position.
Secure downwind wind against the
Plane shape in the field in the process of securing downwind
Extends the area of frost-prevention effect that is almost square with ridges
In order to adjust the horizontal swinging motion of this anti-frost fan,
Stop for a predetermined period of time, and then fix at this predetermined stop time
Equipped with a swinging device that ensures downwind for the direction
This is a method of defrosting with a defrosting fan.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A frost-prevention fan capable of swinging horizontally with a predetermined depression angle (the depression angle can be freely changed) is provided on a building pillar, and the depression angle of the frost-prevention fan with respect to the ground surface is approximately equal. 15 ° to about 50 ° (an example), and in this state, the horizontal swing of the frost-prevention fan and the depression angle of the frost-prevention fan are used to blow warm air of the inversion layer to the ground surface of the field. Lower it (see Figure 2).

First, the examples shown in FIGS. 3 to 9 are examples of a configuration in which the swinging device is stopped at 45 °. For example, as shown in the installation plan view of FIG. This is an example, so as mentioned above, our 60 °, 75 °,
120 ° or other swinging angles of other companies can be supported. )
However, the time required for this is about 68 seconds (an example of an experimental example. The same applies hereinafter). And at that 45 ° 15
Stop for 2 seconds (this is an example of an experimental example. The same applies hereinafter). As shown in the swing angular velocity waveform diagram of FIG. 4, it is clearly shown that the situation is stopped at 45 ° for 15 seconds. Then, when showing the wind reaching distance, as shown in the wind reaching distance plan view of FIG.
It can be expected that the reaching distance of the wind with respect to the fixed direction at 45 ° can be expanded, and that the expansion frost-proof effect at 45 ° is formed in the figure. This expanded anti-frost effect can be expected to have a substantially rectangular anti-frost effect area. Figure 6 shows the comparison of the wind reach distance with the swing angle. In this figure, the expansion of the wind reach distance at 45 ° (having a convex shape) is clearly shown. Incidentally, the above-mentioned 45
It can be seen that the anti-frost effect in the ° direction is sufficient. In the plan view of the anti-frost effect in FIG. 7, the anti-frost effect in the 45 ° direction has a convex shape (hereinafter referred to as a convex shape), and the tendency of expansion of the reach distance of the wind at 45 ° can be seen. , The overall anti-frost effect is a square shape in a plane shape,
In addition, it was found that this substantially rectangular defrosting effect area has a good effect on the expansion of the defrosting effect. Therefore, as shown in the anti-frost effect distance diagram of FIG. 8, it can be understood that the anti-frost effect in the 45 ° direction is sufficient. Assuming that the wind is blown down on the field by utilizing this expanded anti-frost effect, 45 °
The frost-prevention effect in the direction is convex, and, as described above, the plane shape of the entire frost-prevention effect is a substantially square shape (hereinafter, referred to as a substantially square shape), so that the frost-prevention effect can be expanded.
It was also found that it is not necessary to install a defrosting fan in the field of this recess as in the conventional example. Therefore, a situation in which a large number of anti-frost fans are installed in a virtual field will be described with an experimental example. First, since the anti-frost effect is almost rectangular and it is not necessary to install an anti-frost fan in the field of the recess, it is attempted to achieve the anti-frost effect of the field of 3800 m ² with the anti-frost fan of this example. Then, the number of the anti-frost fans is 21, as shown in the frost-preventing effect imaginary plan view of FIG. 9. Then, as shown in this figure, the overlapping area (S) is considerably reduced due to the relationship with the anti-frost effect area. Incidentally, assuming that the frost-preventing effect area of one frost-preventing fan of this example under the environment setting is about 268 m ² (the numerical value in the experimental example), the overlapping area (S) is 268 m ² × 21. Stand-3800m ² = 1
It became 828 m ² , and it was found that there were very few overlapping areas (S) and efficient air blowing was possible. That is, as compared with the conventional method, since a substantially rectangular frost-proof effect area can be expected, a reduction of about 40% can be expected.

Next, the examples shown in FIGS. 13 to 19 were prepared based on the experimental results shown in FIGS. 3 to 9. This example is a configuration example in which the swinging device is stopped at the swinging positions of 30 °, 45 °, and 60 °. As shown in the installation plan view of FIG. 13, 90 ° swinging is performed, but this is required. About 6 hours
8 seconds. Therefore, the 30 ° swing position (below 30
Let be °. ) For 4 seconds (an example of an experiment, the same applies hereinafter), and 7 at a 45 ° swing position (hereinafter referred to as 45 °).
It is stopped for 4 seconds (an example of an experiment. The same applies to the following) and 4 seconds at an oscillating position of 60 ° (hereinafter referred to as 60 °) (an example of the experiment. The same applies to the following). As shown in the swing angular velocity waveform diagram of FIG.
It is clearly stated that the swing stop will be 4 seconds, 7 seconds, 4 seconds (hereinafter, 4 seconds, etc.) at 60 °. Then, when showing the wind arrival distance, as shown in the wind arrival distance plan view of FIG. 15, it can be expected that the arrival distance of the wind with respect to the fixed direction in 4 seconds or the like will be expanded, and in the figure, 30 °, 45 °, 60 ° ( Hereinafter, the degree of expansion is 30 ° or the like), and it is clarified that the expanded anti-frost effect is formed. This expanded anti-frost effect can be expected to have a substantially rectangular anti-frost area. Fig. 16 is a diagram comparing the arrival distance of this wind with the swing angle, and in this figure, the expansion of the arrival distance of each wind at 30 ° etc. (each has a convex shape) is clearly shown. . In addition, it can be understood that the above-mentioned anti-frost effect in each direction such as 30 ° is sufficient. In the plan view of the anti-frost effect of FIG. 17, the anti-frost effect in each direction such as 30 ° has a convex shape, and the tendency of expansion of the reach distance of the wind at 30 ° and the like can be seen, and the overall anti-frost effect. The effective area is a plane shape and has a substantially square shape with convex stripes (hereinafter, referred to as a substantially square shape).
In addition, it was found that this almost rectangular defrosting effect area has a favorable effect on the expansion of the defrosting effect. Therefore, FIG.
As shown in the defrosting effect distance chart of No. 8, it can be understood that the defrosting effect in each direction such as 30 ° is sufficient. Then, assuming that the wind is blown down in the field by utilizing the expanded frost prevention effect, the frost prevention effect area in each direction such as 30 ° has a convex shape (hereinafter, referred to as a convex shape), and this almost square shape. It was found that the frost-prevention effect area of the positively influences the expansion of the frost-prevention effect. Therefore, as shown in the defrosting effect distance diagram of FIG.
It can be understood that the anti-frost effect in each direction such as 30 ° is sufficient. Assuming that the wind is blown down in the field by utilizing this expanded defrosting effect, the defrosting effect in each direction such as 30 ° becomes a convex shape, and, as described above, the overall shape of the defrosting effect is almost flat. It was found that the anti-frost effect can be enhanced because it has a rectangular shape, and that it is not necessary to install an anti-frost fan in the field of this recess as in the conventional example. Therefore, a situation in which a large number of anti-frost fans are installed in a virtual field will be described with a schematic experimental example. First of all, since the frost-proof area is almost square and there is no need to install a frost-proof fan in the recessed field, let's achieve the frost-proof effect in the field of 3800 m ² with the frost-proof fan of this example. Then, the number of frost-prevention fans is 18, as shown in the frost-prevention effect imaginary plan view of FIG. Then, as shown in this figure, the overlapping area (S) is considerably reduced due to the relationship with the anti-frost effect area. Incidentally, assuming that the frost-preventing effect area of one frost-preventing fan of this example under the environment setting is about 292 m ² (the numerical value in the experimental example), the overlapping area (S) is 292 m ² × 18. Stand-
3800m ² = 1456m ^2, and the overlapping Eria (S) that can very little efficient blower was found. That is, as compared with the conventional method, a substantially rectangular anti-frost effect area can be expected, so a reduction in the number of vehicles by about 45% can be expected.

[0015]

EXAMPLE An example of the anti-frost fan A used in this method is shown in FIG.
Explaining with (FIG. 2), the general structure of the frost-prevention fan A is that a building pillar 1 is erected on a field B, a swinging device 2 (stand) provided on the building pillar 1, and The depression angle adjusting device 4 is provided on the swinging device 2 so as to be able to swing in the horizontal direction via the mounting shaft 3, and the depression angle adjusting device 4 is used for adjusting the depression angle of the fan 5 for defrosting and for supporting the motor 6. Motor base 7
Is provided. The angle adjustment of the motor base 7 can be changed.

In the anti-frost fan A having the above structure,
The warm air generated by the defrosting fan 5 rotating by the motor 6 is blown down toward the tea trees C (fruit trees, plants) in the field B, and the depression angle adjusting device 4 is a motor provided in the swinging device 2 ( It is provided so as to be movable in the horizontal direction by using a drive device (not shown) such as (not shown) and a swinging mechanism (not shown) and so-called horizontal swinging operation. By this swinging motion in the horizontal direction and the rotation of the frost-preventing fan 5, warm air is directed toward the field B in a 90 ° fan shape (an example. Therefore, as described above, 60 °, 75 °, respectively).
It can also be used for swinging angles such as 120 °. ) Has a structure that blows warm air down. Then, as described above, the horizontal swinging motion is temporarily stopped in the course of this horizontal swinging motion and at a predetermined position.

The stop mechanism of the swinging device is a stopper,
Various mechanisms such as a mechanical mechanism such as a stop device, a combination mechanism of a timer and a sensor, a control circuit mechanism, a computer control mechanism, or the like can be adopted. First, FIG. 10 and FIG.
As an electric control method, for example, a limit switch 20, a one-shot timer 21, a timer 21
1 and a configuration for stopping the rotation of the swing motor 22 are adopted. As a typical example, the limit switch 2 of FIG.
Describing the combination of 0 and the one-shot timer 21, when the limit switch 20 is turned on, the one-shot timer 21 is activated, the contact for the one-shot timer (contact 22b for driving the swing motor) is cut off, and the swing device The head swing motor 22 is stopped. Therefore, the building pillar 1
The oscillating device 2 of the anti-frost fan A provided in the above stops. After that, when the one-shot timer 21 times out, the contact 22b for driving the swing motor is connected and the swing motor 22
Is operated, the swinging device 2 rotates, and the swinging operation of the anti-frost fan A is started. After that, this operation is repeated. Also, the limit switch 20 and the timer 21 shown in FIG.
When explained in combination with 1, the limit switch 20 is set to O
When N, the timer 211 is activated, the contact 21b for timer activation is turned on, and the relay 23 is turned on. As a result, the contact 22b for driving the oscillating motor is cut off, and the oscillating motor 22 of the oscillating device is stopped. Therefore, the building pillar 1
The oscillating device 2 of the anti-frost fan A provided in the above stops. After that, when the timer 211 times out, the contact 21b for operating the timer is cut off and the relay 23 is turned off, so that electricity is cut off and the contact 22b for driving the swing motor is connected to operate the swing motor 22. Then, the swinging device 2 rotates and the swinging operation of the anti-frost fan A is started. After that, this operation is repeated. Next, FIG. 13 shows a mechanical structure in which the cam disk 30 of the oscillating device is provided with a projection 31 and the projection 31 and the limit switch 32 stop the rotation of the cam disk 30 of the oscillating device. is there.

[0018]

INDUSTRIAL APPLICABILITY The present invention uses a frost-prevention fan equipped with a swing device installed in a field to generate warm air, air, gas, and other winds.
Blowdown at a predetermined depression angle, a frost process can be ensured frost effect area of generally square shape in planar shape, this
This horizontal swing motion of the horizontal swing device
Secure downwind against the
In the process of securing downwind, the plane shape in the field
Expanding the frost-proof effect area, which is almost square and has ridges
In order to prevent horizontal movement of this anti-frost fan
At the specified stop time, and
A swinging device with a structure that ensures downwind in a fixed direction
This is an anti-frost method using the provided anti-frost fan. Therefore,
It has the following effects. Number of anti-frost fans in the field
Can be reduced. Efficiency of anti-frost fan in field
Air can be secured. Anti-frost fan stand in the field
Cost reduction, energy saving, or product reduction
There is an effect that the simplicity of work is achieved. There is an effect that wind can reach the conventional concave field, and a more reliable and excellent anti-frost effect can be expected.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a defrosting fan A of the present invention.

FIG. 2 is a diagram showing a situation in which a defrosting fan A is installed in the field of the present invention.

FIG. 3 is an installation plan view in which the swinging device of the anti-frost fan is stopped at 45 °.

FIG. 4 is a swing angular velocity waveform diagram for stopping the swing device of the anti-frost fan at 45 °.

FIG. 5 is a plan view of a wind reaching distance in which the swinging device of the anti-frost fan is stopped at 45 °.

FIG. 6 is a wind reaching distance diagram in which the swinging device of the anti-frost fan is stopped at 45 °.

FIG. 7 is a plan view showing an anti-frost effect in which the swinging device of the anti-frost fan is stopped at 45 °.

FIG. 8 is a frost-prevention effect distance diagram for stopping the swinging device of the frost-prevention fan at 45 °.

FIG. 9 is a imaginary plan view showing an anti-frost effect in which the swinging device of the anti-frost fan is stopped at 45 °.

FIG. 10 is a circuit diagram showing an example of a stop mechanism of the swinging device of the anti-frost fan.

FIG. 11 is a circuit diagram showing another example of a stopping mechanism of the swinging device of the anti-frost fan.

FIG. 12 is a circuit diagram showing still another example of the stop mechanism of the swinging device of the anti-frost fan.

FIG. 13 shows a swinging device of a frost-proof fan at 30 °, 45 °, 6
It is an installation top view which stops at 0 degree (henceforth, 30 degree etc.).

FIG. 14 is a swinging angular velocity waveform diagram for stopping the swinging device of the anti-frost fan at 30 ° or the like.

FIG. 15 is a plan view of a wind reaching distance at which the swinging device of the anti-frost fan is stopped at 30 ° or the like.

FIG. 16 is a wind reaching distance diagram in which the swinging device of the anti-frost fan is stopped at 30 ° or the like.

FIG. 17 is a plan view showing an anti-frost effect in which the swinging device of the anti-frost fan is stopped at 30 ° or the like.

FIG. 18 is a defrosting effect distance diagram for stopping the swinging device of the defrosting fan at 30 ° or the like.

FIG. 19 is a imaginary plan view showing an anti-frost effect in which the swinging device of the anti-frost fan is stopped at 30 ° or the like.

FIG. 20 is a plan view of installation using a conventional anti-frost fan.

FIG. 21 is a swing angular velocity waveform chart of a conventional anti-frost fan.

FIG. 22 is a plan view of a wind reaching distance by a conventional anti-frost fan.

FIG. 23 is a wind reach distance diagram of a conventional anti-frost fan.

FIG. 24 is a plan view showing a defrosting effect by a conventional defrosting fan.

FIG. 25 is a frost-prevention effect distance diagram of a conventional frost-prevention fan.

FIG. 26 is a imaginary plan view showing a defrosting effect by a conventional defrosting fan.

[Explanation of symbols]

1 Building Post 2 Shaking Device 3 Mounting Shaft 4 Depression Angle Adjusting Device 5 Fan 6 Motor 7 Motor Base 20 Limit Switch 21 One-shot Timer 211 Timer 21b Timer Operating Contact 22 Swing Motor 22b One-shot Timer Contact (Swinging) Motor drive contact) 23 Relay 30 Cam disk 31 of swing device 31 Protrusion 32 Limit switch A Frostproof fan B Field C Tea plant S Overlapping area

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F04D 27/00 A01G 13/08 F04D 25/10

Claims (2)

(57) [Claims] 1. A warming air, a wind such as air, a gas, or the like is provided at a predetermined depression angle by using a defrosting fan provided with a swinging device installed in a field.
In blowdown, a frost process can be ensured frost effect area of generally square shape in plan shape, with the movement of the horizontal swinging operation of the neck-vibration apparatus, the swing position
Ensure downwind for the installation and match this swing position
In the process of securing downwind wind
Expanding the almost square frost-proof effect area with convex ridges
In order to achieve the desired level of horizontal swing motion of this anti-frost fan
Stop for a predetermined time at
Swing device with a structure that ensures downwind in the fixed direction
Frost the method according to frost fan with a. 2. A defrosting method using a defrosting fan having a swinging device according to claim 1, wherein the swinging device is provided with a depression angle adjusting function.