JPH1026097A - Method for preventing frost by frost preventing fan provided with oscillating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the area shape having the sufficient frost preventing effect and to realize reduction of the number of frost preventing fans by securing blowing-down air in relation to the fixing direction in the stop position and the stop time by making use of halting of the oscillating operation of a frost preventing fan, and obtaining the approximately square frost preventing effective area. SOLUTION: A frost preventing fan A is a fan 5 to be rotated by a motor 6 and for preventing frost, and it blows down warm air to be formed toward plants in a field. A depression angle adjusting device 4 can be moved in the horizontal direction by making use of a driving device such as a motor provided on an oscillating device 2 and an oscillating mechanism and performs the horizontal oscillating operation. Warm air is blown down into a fan shape toward a field by the oscillating operation in the horizontal direction and the rotation of the frost preventing fan 5. Moreover, blowing-down air in relation to the fixing direction can be secured in the stop position and the stop time by halting the horizontal oscillating operation in the specified position.

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 provided with a swinging device.

[0002]

2. Description of the Related Art As is well known, a frost-proof fan (frost-proof fan) is a simple and low-cost method for preventing frost damage (frost prevention method) in fields such as tea fields, mulberry fields, and orchards where frost damage may occur. Device). Its general configuration is
It looks like this: That is, a horizontal anti-frost fan is provided on the pole, and the angle of depression of the anti-frost fan with respect to the ground surface is set to about 15 ° to about 50 ° (an example). This is a device for blowing down warm air of an inversion layer on the ground surface of a field using a horizontal swing of a frost fan and a depression angle of the frost prevention fan. The frost prevention area will be described with reference to FIGS.

The environment setting of this example (an example based on experiments using our products) and the embodiment of the present invention is as follows.

Location: Kira-cho, Hazu-gun, Aichi Prefecture Date: April 14, 1996 Time: Temperature sensor position based on AM5: 30: 10,000 mm behind the direction of fan wind Temperature: -3 ° C (height above ground) 1000mm) Leaf temperature; -4.5 ° C Fan type (our product); DFC710 type Blade diameter; 700mm Fan motor output; 980W Swing motor input; 30W (reduction ratio = 1/2000) Swing angle; Approx. 90 ° Total length of pillars: 8000mm Pillars (height above ground): 6700mm Fan center: 6860mm

[0005] In this conventional example (by an experiment using our products), as shown in the installation plan view of FIG.
Swing by 0 ° (This is an example of an experimental example. In our company, swing angles include other angles of about 60 °, about 75 °, about 120 °, and so on.) However, as shown in the swinging angular velocity waveform diagram in FIG. 21, in this experimental example, the vicinity of 0 ° (hereinafter, the vicinity is omitted) and the vicinity of 90 ° (hereinafter, referred to as the right and left ends) are slow, and the center (45 °). Is taken as an example.) As a result, a continuous waveform (swinging sine waveform) having just a mountain shape is formed. The time required to repeat this waveform (swinging) is about 38 seconds. FIG. 22 is a plan view showing the reach distance of the wind by this swinging motion (movement).
As shown in the plan view of the wind reach distance, the wind reach distance is longer at the right and left ends, and 45 ° is shorter than the right and left ends. I understand. Examining the effect (adverse effect) of this decreasing tendency on the frost prevention effect, as shown in FIG.
It can be understood that the anti-frost effect in the 45 ° direction is not sufficient.
FIG. 25 is a drawing comparing the reaching distance of the wind with the swing angle.
In this figure, the reduction of the reach distance of the wind at 45 ° (having a concave shape) is clearly shown. It is to be noted that FIG. 24 is a diagram which can be understood that the anti-frost effect in the 45 ° direction is not sufficient as described above.
The anti-frost effect in the 45 ° direction is concave. Therefore, in order to prevent frost in this concave field (hereinafter referred to as a concave field), it is necessary to install a defrost fan also in the concave field. Based on this result, assuming that a large number of defrost fans are installed in a virtual field, as shown in the plan view of the anti-frost effect in FIG. 26, assuming that the field is 3800 m ² ,
The frost prevention effect area of one frost prevention fan is about 242 m ² (the value of the experimental example; the same applies hereinafter). However, since the number of overlapping areas (S) is extremely large, the number of the frost prevention fans is as follows. It will be 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 number of overlapping areas (S) is extremely large, which is the reason that efficient air blowing is not possible.

On the other hand, as related prior art documents, (1)
Japanese Patent Publication No. Hei 3-62920 aiming at the arrival and departure of warm air, and Japanese Unexamined Patent Publication No. Hei 6-93996 provided with (2) a control circuit for controlling a horizontal swing / swing stop mechanism. First, the invention of (1) is a drive device for a frost prevention fan, which is provided with a swing table provided on a gantry so as to be able to swing horizontally and a frost prevention fan provided on the swing table so as to be capable of adjusting a depression angle. And a motor base provided for the motor and the rocking table for controlling the swing of the motor, and a mechanism for controlling forward and backward movement of the motor base. The angle of depression of the frost fan can be varied, and the horizontal oscillating mechanism can be swung horizontally. Thereby, the reaching distance of the warm air in the direction of the reciprocating path of the defrost fan is set to be far and near. Next, the invention of (2) relates to a fan and a method of controlling the swing of the fan. In the left and right swing operation, the position of the head of the fan when the operation unit is operated is detected. A fan provided with a control circuit for stopping the left and right oscillating operation for a predetermined time, wherein the left and right oscillating operation is stopped at a desired position for a predetermined time to increase the amount of air blown in a desired direction and comfortably. To improve the performance.

[0007]

The method of securing the wind reaching distance in all directions of the field by the swing and the time of the swing device described in detail above cannot establish a sufficient defrosting effect area shape. And that it is not possible to expect a reduction in the number of defrost fans.

In the invention of (1), the area of the defrosting effect can be certainly expanded. However, the arrival of the warm air to a distant place is instantaneous, and the arrival of the warm air is different depending on the forward path and the return path (the arrival of the warm air is different between the forward path and the return path because the depression angle is different). And the like, the effect of the expansion is not sufficient, and the reduction in the number of anti-frost fans according to the present invention is still insufficient.

In the invention of (2), since the swing operation is stopped at a desired position for a predetermined time, an increase in the amount of air blown at this position can be expected. However, it does not intend to increase the wind reach distance, reduce the number of installed anti-frost fans, or stop (fix) at a predetermined position. Therefore, the purpose and the technical content are different from those of the present invention, which are intended to increase the wind reach distance at a predetermined position and to reduce the number of installed defrost fans.

[0010]

SUMMARY OF THE INVENTION In view of the above, the present invention provides
To reduce the number of anti-frost fans in the field, expand the area of the anti-frost effect in the field, and achieve energy saving and cost reduction, the following configuration is adopted.

That is, according to the frost prevention method using the frost preventing fan provided with the oscillating device of the present invention, the wind such as warm air, air, gas, etc. is generated by using the frost preventing fan provided with the oscillating device installed in the field. This is a frost prevention method capable of securing a substantially square frost prevention effect area by blowing down, and the frost prevention method uses the movement of the swinging motion of the oscillating device, and While securing the downdraft wind in the swing direction, utilizing the temporary stoppage of the swing operation of the frost prevention fan, securing the downdraft wind in the fixed direction at the stop position / time, the substantially square shape This is a configuration characterized by securing a defrosting effect area.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A frost prevention fan is provided on a pole with a predetermined depression angle (the depression angle can be freely changed), and the frost prevention fan has a depression angle with respect to the ground surface of about one. The angle is about 15 ° to about 50 ° (an example), and in this state, the warm air of the inversion layer is blown to the ground surface of the field using the horizontal swing of the frost prevention fan and the depression angle of the frost prevention fan. Lower (see FIG. 2).

First, the example shown in FIGS. 3 to 9 is a configuration example in which the oscillating device is stopped at 45 °. For example, as shown in the installation plan view of FIG. Therefore, as mentioned above, our 60 °, 75 °,
120 ° or other swing angles from other companies can be accommodated. )
The time required for this is about 68 seconds (an example of an experimental example; the same applies hereinafter). And 15 at that 45 °
Stop for 2 seconds (an example of an experimental example; the same applies hereinafter). As shown in the swinging angular velocity waveform diagram of FIG. 4, the situation is clearly described as stopping at 45 ° for 15 seconds. And when the wind reaching distance is shown, as shown in the wind reaching distance plan view of FIG.
It can be expected that the reach of the wind in the fixed direction at 45 ° can be increased, and the drawing clearly shows that the expanded frost prevention effect at 45 ° is formed. This expansion and defrosting effect can be expected to have a substantially square defrosting effect area. Fig. 6 compares the reaching distance of the wind by the swing angle, and in this figure, the expansion of the reaching distance of the wind at 45 ° (having a convex shape) is clearly shown. Note that, as described above, 45
It can be understood that the frost prevention effect in the ° direction is sufficient. Then, in the plan view of the defrosting effect in FIG. 7, the defrosting effect in the 45 ° direction has a convex shape (hereinafter, referred to as a convex shape). , The overall frost prevention effect is almost square in a planar shape,
In addition, it was found that the substantially square frost prevention effect area had a favorable effect on the expansion of the frost prevention effect. Therefore, as shown in the defrosting effect distance diagram of FIG. 8, it can be understood that the defrosting effect in the 45 ° direction is sufficient. Then, assuming that the wind was blown down to the field using this expanded frost prevention effect, 45 °
The anti-frost effect in the direction is convex, and as described above, the planar shape of the entire anti-frost effect exhibits a substantially square shape (hereinafter, referred to as a substantially square shape), so that the anti-frost effect can be expanded.
And it became clear that it was not necessary to install an anti-frost fan in the field of this concave part like a conventional example. Therefore, a situation in which a large number of frost preventing fans are installed in a virtual field will be described with an experimental example. First, since the defrosting effect is almost square and it is not necessary to install a defrosting fan in the concave field, it is attempted to achieve the defrosting effect of the field of 3800 m ² with the defrosting fan of this example. Then, as shown in the imaginary plan view of the anti-frost effect in FIG. 9, the number of the anti-frost fans is 21. Then, as shown in this example, the overlapping area (S) is considerably reduced due to the relationship with the defrosting effect area. Incidentally, if the area of the defrosting effect of one of the defrosting fans of this example under the above-mentioned environment setting is about 268 m ² (the value in the experimental example), the overlapping area (S) is 268 m ² × 21. Stand-3800m ² = 1
It was 828 m ² , and it was found that the area (S) that overlapped was extremely small and efficient air blowing could be performed. That is, since a substantially square anti-frost effect area can be expected as compared with the conventional method, a reduction of about 40% can be expected.

Next, the examples shown in FIGS. 13 to 19 were created based on the experimental results shown in FIGS. This example is a configuration example in which the oscillating device is stopped at the 30 °, 45 °, and 60 ° swing positions. As shown in the installation plan view of FIG. Time is about 6
8 seconds. Therefore, the 30 ° swing position (hereinafter referred to as 30 °)
°. ) For 4 seconds (an example of an experimental example; the same applies hereinafter), and 7 at a 45 ° swing position (hereinafter referred to as 45 °).
The operation is stopped for 2 seconds (an example of an experimental example; the same applies hereinafter) and at a 60 ° swing position (hereinafter referred to as 60 °) for 4 seconds (an example of an experimental example; the same applies hereinafter). This situation is shown in the swinging angular velocity waveform diagram of FIG.
4 and 7 and 4 seconds at 4 ° and 60 ° (hereinafter referred to as 4 seconds, etc.). Then, as shown in the wind reach distance plan view of FIG. 15, the wind reach distance can be expected to be expanded in a fixed direction at 4 seconds or the like. Hereinafter, the angle is set to 30 °, etc.). This expanded frost prevention effect can be expected to have a substantially square frost prevention effect area. Fig. 16 compares the reaching distance of the wind by the swing angle, and in this figure, the expansion of the reaching distance of each wind at 30 ° or the like (each having a convex shape) is clearly shown. . In addition, it can be understood that the anti-frost effect in each direction such as 30 ° described above is sufficient. In the plan view of the defrosting effect shown in FIG. 17, the defrosting effect in each direction such as 30 ° has a convex shape. The effect area becomes a substantially square shape having a convex shape in a planar shape (hereinafter, referred to as a substantially square shape),
It was also found that the substantially square frost preventing effect area had a favorable effect on the expansion of the frost preventing effect. Therefore, FIG.
As shown in the frost prevention effect distance diagram of FIG. 8, it can be understood that the frost prevention effect in each direction such as 30 ° is sufficient. Then, assuming that the wind is blown down to the field using the expanded frost prevention effect, the frost prevention effect area in each direction such as 30 ° becomes a convex shape (hereinafter, referred to as a convex shape), and has a substantially rectangular shape. It was found that the area of the anti-frost effect had a positive effect on the expansion of the anti-frost effect. Therefore, as shown in the defrosting effect distance diagram of FIG.
It can be understood that the defrosting effect in each direction such as 30 ° is sufficient. Then, assuming that the wind is blown down to the field using the expanded frost prevention effect, the frost prevention effect in each direction such as 30 ° becomes convex, and, as described above, the planar shape of the entire frost prevention effect is almost the same. It has been found that the rectangular shape makes it possible to expand the anti-frost effect, and that it is not necessary to install an anti-frost fan in the field of this recess unlike the conventional example. Therefore, a situation in which a large number of frost preventing fans are installed in a virtual field will be described with reference to a schematic experimental example. First, since the area of the defrosting effect is almost square and there is no need to install a defrosting fan in the concave field, the defrosting fan of this example will achieve a defrosting effect of 3800 m ^{2 in} the field. Then, as shown in the plan view of the anti-frost effect in FIG. 19, the number of the anti-frost fans is 18 units. Then, as shown in this example, the overlapping area (S) is considerably reduced due to the relationship with the defrosting effect area. Incidentally, when the area of the defrosting effect of one of the defrosting fans of this example under the above environment setting is about 292 m ² (the value in the experimental example), the overlapping area (S) is 292 m ² × 18. Table-
3800m ² = 1456m ^2, and the overlapping Eria (S) that can very little efficient blower was found. That is, since a substantially square anti-frost effect area can be expected as compared with the conventional method, a reduction of about 45% can be expected.

[0015]

FIG. 1 shows an example of an anti-frost fan A used in the present method.
Explaining with reference to FIG. 2, the general configuration of the anti-frost fan A includes a pole 1 erected on a field B, a oscillating device 2 (stand) provided on the pole 1, A depression angle adjusting device 4 provided on the oscillating device 2 so as to be able to oscillate in a horizontal direction via a mounting shaft 3, and the depression angle adjusting device 4 is used for adjusting a depression angle of a fan 5 for anti-frost and for supporting a motor 6. Motor base 7
Is provided. Note that the angle adjustment of the motor base 7 can be changed.

In the anti-frost fan A employing the above configuration,
The warm air generated by the anti-frost fan 5 rotated by the motor 6 is blown down toward the tea plant C (fruit tree, plant) in the field B, and the depression angle adjusting device 4 includes a motor ( It is provided so as to be movable in the horizontal direction using a driving device (not shown) such as a not-shown) and a swing mechanism (not shown), and performs a so-called horizontal swing operation. By this swinging motion in the horizontal direction and the rotation of the anti-frost fan 5, the warm air is directed toward the field B by a 90 ° fan shape (an example. Therefore, as described above, 60 °, 75 °,
It can also handle swing angles such as 120 °. ) To blow off the warm air. Then, as described above, the horizontal swing operation is temporarily stopped during the horizontal swing operation and at a predetermined position.

The stop mechanism of the oscillating device includes a stopper,
Various mechanisms such as a mechanical mechanism such as a stop device, a combination mechanism with a timer and a sensor, a control circuit mechanism, and a computer control mechanism can be employed. First, FIGS. 10 and 11
As an electrical 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 oscillating motor 22 is adopted. As a representative example, limit switch 2 shown in FIG.
Explaining 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 oscillating motor) is cut off, and the oscillating device is turned on. Is stopped. Therefore, pillar 1
The oscillating device 2 of the anti-frost fan A provided in the above is stopped. Thereafter, when the one-shot timer 21 times out, the contact 22b for driving the oscillating motor is connected and the oscillating motor 22 is connected.
Is driven, and the oscillating device 2 rotates to start the oscillating operation of the anti-frost fan A. Thereafter, this operation is repeated. The limit switch 20 and the timer 21 shown in FIG.
Explaining in combination with 1, the limit switch 20 is set to O
When N, the timer 211 is operated, the contact 21b for timer operation is turned on, and the relay 23 is turned on. Thus, the contact 22b for driving the oscillating motor is shut off, and the oscillating motor 22 of the oscillating device is stopped. Therefore, pillar 1
The oscillating device 2 of the anti-frost fan A provided in the above is stopped. Thereafter, when the timer 211 expires, the timer operating contact 21b is cut off and the relay 23 is turned off, so that electricity is cut off and the oscillating motor driving contact 22b is connected to operate the oscillating motor 22. Then, the oscillating device 2 rotates to start the oscillating operation of the anti-frost fan A. Thereafter, this operation is repeated. Next, FIG. 13 shows a mechanical configuration in which a projection 31 is provided on the cam disk 30 of the oscillating device, and the rotation of the cam disk 30 of the oscillating device is stopped by the projection 31 and the limit switch 32. is there.

[0018]

According to the present invention, the oscillating device for the fan is stopped at a predetermined angular position, the same position or the same number of positions, and at the same time. Use at least a pause in the center,
Enlargement and defrosting effect area by securing the downdraft wind in the fixed direction at the stop position and time, and securing the downdraft wind in the swing direction of this motion using the motion of the swing motion of the oscillating device Has the effect of establishing an area of frost prevention effect, and the effect of establishing a substantially square frost prevention area in the field. In addition, the establishment of the substantially square defrosting effect area has an effect that, for example, the number of defrosting fans in a field is reduced, and cost reduction and energy saving, and simplicity of operation are achieved. Further, there is an effect that the wind can reach the conventional concave-shaped field, and a more reliable and excellent frost prevention effect can be expected.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a situation where a defrost fan A is installed in a field according to the present invention.

FIG. 3 is an installation plan view for stopping the oscillating device of the anti-frost fan at 45 °.

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

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

FIG. 6 is a view showing a wind reaching distance at which the oscillating device of the anti-frost fan is stopped at 45 °.

FIG. 7 is a plan view of the anti-frost effect of stopping the oscillating device of the anti-frost fan at 45 °.

FIG. 8 is a defrost prevention effect distance diagram in which the oscillating device of the defrost fan is stopped at 45 °.

FIG. 9 is an imaginary plan view of the anti-frost effect of stopping the oscillating device of the anti-frost fan at 45 °.

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

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

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

FIG. 13 shows that the oscillating device of the anti-frost fan is rotated at 30 °, 45 °, and 6 °.
It is an installation top view which stops at 0 degrees (hereinafter, 30 degrees etc.).

FIG. 14 is a swing angular velocity waveform diagram in which the swing device of the anti-frost fan is stopped at 30 ° or the like.

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

FIG. 16 is a view showing a wind reaching distance at which the oscillating device of the anti-frost fan is stopped at 30 ° or the like.

FIG. 17 is a plan view of the anti-frost effect of stopping the oscillating device of the anti-frost fan at 30 ° or the like.

FIG. 18 is a frost prevention effect distance diagram in which the oscillating device of the frost prevention fan is stopped at 30 ° or the like.

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

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

FIG. 21 is a waveform diagram of a swing angular velocity by 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 diagram showing a wind reaching distance by a conventional anti-frost fan.

FIG. 24 is a plan view of a defrosting effect of a conventional defrosting fan.

FIG. 25 is a diagram showing a defrosting effect distance by a conventional defrosting fan.

FIG. 26 is a plan view showing a frost preventing effect of a conventional frost preventing fan.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Construction pole 2 Shaking device 3 Mounting axis 4 Depression angle adjusting device 5 Fan 6 Motor 7 Motor base 20 Limit switch 21 One shot timer 211 Timer 21b Contact for timer operation 22 Swing motor 22b Contact for one shot timer (Swinging) Motor drive contact) 23 Relay 30 Cam disk of oscillating device 31 Projection 32 Limit switch A Defrost fan B Field C Tea plant S Overlapping area

Continued on the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical display location F04D 25/10 302 F04D 25/10 302Q 302E

Claims (6)

[Claims] Claims: 1. Blowing down air such as warm air, air, gas, etc. using an anti-frost fan provided with a oscillating device installed in a field,
A defrosting method capable of securing a substantially square defrosting effect area, wherein the defrosting method uses the movement of the swinging motion of the oscillating device to blow down in the swinging direction of the motion. While securing the draft, the suspension of the swinging motion of the anti-frost fan is used to secure the blow-down wind in the fixed direction at the stop position / time, and the substantially square-shaped defrosting effect area is secured. A frost prevention method using a frost prevention fan provided with a swing device, characterized by securing. 2. Using the temporary stop of the swing operation of the frost prevention fan, a downdraft in a fixed direction is secured at the stop position / time, and the downdraft in a fixed direction at the stop position / time. The frost prevention method using a frost prevention fan provided with the oscillating device according to claim 1, wherein the draft is projected in a substantially mountain-like shape. 3. The method of claim 1, wherein the oscillating device is temporarily stopped at several points. 4. The method of claim 1, wherein the oscillating device is provided with a depression angle adjusting function. 5. The frost prevention method using a frost prevention fan provided with the oscillating device according to claim 1, wherein the temporary stop portion is configured to be variable. 6. A method according to claim 1, wherein said stopping time is variable.