JPH0410761Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device that prevents a vinyl greenhouse for greenhouse cultivation from being damaged by gusts of wind and damaging the cultivated vegetables.

[Conventional technology]

Vinyl greenhouses for greenhouse cultivation of vegetables and fruit trees are constructed by constructing a frame using pipes or the like in a field and covering the entire structure with a vinyl sheet. During greenhouse cultivation seasons, ventilation fans are installed to manage the temperature and humidity of the vegetables and fruit trees grown inside, and it is possible to control the temperature and humidity unattended to some extent. .

However, in a vinyl house, the vinyl sheet that is the exterior body may flap due to gusts of wind, etc.
It may turn over, but if you leave it in that state, the vinyl sheet may tear. Once the vinyl sheet is torn, the damage spreads and the entire vinyl sheet is turned over, exposing the vegetables and fruit trees inside to the cold.
Or get blown away. Furthermore, when wind blows into a vinyl house, the entire vinyl sheet swells and may separate from the frame and tear.

In order to deal with these problems,
Publication No. 142342 states that the vinyl house is sealed,
A device is described that prevents vinyl sheets from flapping or curling by reducing the pressure inside the house due to strong winds or the like.

Even in such a device, since it is necessary to constantly ventilate the house depending on the temperature and humidity inside the house, the pressure reducing device is not activated and is activated only when there is strong wind.

[Problem that the invention attempts to solve]

Therefore, in order to effectively operate the conventional device to prevent damage to the house,
One person must be on standby to monitor the greenhouse. In addition, gusts of wind sometimes blow at night, so people had to jump up and take countermeasures when they felt a sign of wind. For this reason, farmers were unable to go out with their families or get a good night's sleep during the greenhouse cultivation season.

As a means of automatically detecting strong winds and gusts,
It is possible to use a wind meter or other instrument, but using such a precision instrument is problematic in terms of cost, and it is difficult to use a precision instrument that is exposed to the sun, wind, and rain all year round. There are also problems in terms of maintenance.

The present invention aims to prevent wind damage to vinyl houses by automatically detecting a gust of wind by using a wind detection means that has a simple structure and is easy to maintain.

[Means for solving problems]

In order to achieve its purpose, the wind damage prevention device for a vinyl house of the present invention consists of an exhaust fan installed in the vinyl house, a pole erected outside the vinyl house, and a windshield swingably installed on the pole. It is characterized by comprising a plate, a switch that is turned on and off by the swinging of the air receiving plate, and a drive circuit that drives the exhaust fan for a certain period of time when the switch is turned on.

[Effect]

In the present invention, when the wind receiving plate swings when a gust of wind blows, the switch turns on and off. This switch turns on and off instantaneously, but the drive circuit detects the instantaneous on state of the switch and drives the exhaust fan for a certain period of time. If the switch is turned on and off repeatedly in a short period of time, the exhaust fan is constantly driven during that time. When the exhaust fan operates, the inside of the vinyl house becomes depressurized, and the exterior vinyl sheet comes into close contact with the pipes that form the frame of the vinyl house. This allows the vinyl sheet and the skeletal pipe to become integrated, making it better able to withstand the wind blowing outside. In this way, damage caused by damage to the vinyl sheet can be prevented.

If your vinyl house is equipped with a ventilation fan for controlling temperature and humidity, you can use this as an exhaust fan.

〔Example〕

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

FIG. 1 shows an outline of the present invention, in which a wind sensing device 20 is installed outside a vinyl house 10. The vinyl house 10 is composed of a frame 11 made of a pipe and a vinyl sheet exterior body 12, and the vinyl sheet exterior body 12 is tightened by a rope 13 at the middle part of the frame 11. An exhaust fan 14 is installed at the entrance of the vinyl house 10.

FIG. 2 shows an embodiment of the wind sensing device 20, in which a wind receiving plate 22 is movably suspended from a support 21 having a horizontal rod 21a at the tip, and the wind receiving plate 22 is swayed by the wind. be able to move. A permanent magnet 23 is attached to the side of the wind receiving plate 22, and a reed switch 24 is attached to the column 21 opposite to the permanent magnet 23.
Attach. A stopper 25 is provided on the horizontal rod at the top of the support column 21 to prevent the wind receiving plate 22 from coming off. Sensitivity to wind speed can be adjusted by attaching a weight 26 to the wind receiving plate 22 and adjusting the weight of the weight 26 or by changing the attachment position of the weight 26. Alternatively, the wind receiving plate 2
By providing a slit 27 in 2 to reduce the resistance to wind, the sensitivity to slow wind can be reduced. In addition, in this configuration, the wind receiving plate 2
If the wind blows directly from the side of 2, the wind receiving plate 22
will not move. However, in reality, the wind flow is not rectified but turbulent, so
There is no need to be particularly careful to ensure that the wind receiving plate 22 is perpendicular to the direction of the wind.

FIG. 3 shows another example of the wind sensing device, in which a micro switch is used in place of the reed switch 24 of the embodiment shown in FIG. That is, from the horizontal rod 21a of the support 21, the arms 31, 3
2 is extended obliquely downward, and micro switches 33 and 34 are attached to the tips thereof.
When the wind receiving plate 22 comes into contact with the micro switches 33 and 34, the opening and closing of the contacts is detected and a gust of wind is detected.

FIG. 4 shows a drive circuit for the exhaust fan 14 in the embodiment shown in FIG.

That is, by opening and closing the reed switch 24, a pulse signal as shown in FIG. 5 a1 is input to the one-shot multivibrator 28. Due to this pulse input, the one-shot multivibrator 28 outputs the capacitor C and the variable resistor.
A rectangular wave having a time width of time constant T determined by R ₃ is output. The reed switch 24 has a time constant T
If the one-shot multivibrator 28 does not operate again within a time period of , the output signal of the one-shot multivibrator 28 is turned off (see FIG. 5b1). If the next pulse signal arrives during the time constant T as shown in FIG. (See Figure 5 b2). With this configuration, when the wind receiving plate 22 is shaken by a single wind, the one-shot multivibrator 28 is operated for a certain period of time, but when the wind is strong and the wind receiving plate 22 is constantly shaking. In this case, the one shot multivibrator 28 will always be in the on state.

The output signal of the one-shot multivibrator 28 turns on the transistor Q, and energizes the relay 29 connected as its load. relay 29
When the contact point 30 closes, the exhaust fan 14 is driven and the air inside the vinyl house is removed. As a result, the pressure inside the vinyl house becomes reduced, and the vinyl sheet, which is the exterior body, is sucked into the vinyl house. Since the vinyl sheet is supported by the pipes that form the framework of the vinyl house, the vinyl sheet is adsorbed in a concave state between the pipes. This prevents the vinyl sheet from flapping or vibrating even in strong winds. In addition, wind blows into the vinyl house and the vinyl sheets do not swell and become damaged.

Note that the circuit in Figure 4 shows an example in which one reed switch as shown in Figure 2 is used, but when two reed switches are used as in Figure 3, one switch is used. An OR circuit can be connected to the front stage of the Yotsuto multivibrator so that an output is generated no matter which reed switch is activated.

[Effect of idea]

As mentioned above, in the present invention, the wind is detected by the swinging of the wind receiving plate, and the wind is detected by turning the switch on and off to operate the exhaust fan for a certain period of time to reduce the pressure inside the vinyl house. ing. Therefore, the vinyl sheet, which is the exterior body of a vinyl house, sticks to the inside of the house and becomes integrated with the pipes, which are the framework of the vinyl house. This prevents the vinyl sheets from flapping or vibrating even when strong winds blow, and the vinyl house can be protected from strong winds. Furthermore, since a precise instrument such as an anemometer is not used as a means for detecting wind, it is advantageous in terms of cost and maintenance, and can be durable even under conditions of constant exposure to the outside.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an overview of the present invention, Fig. 2 is a perspective view of a wind sensing device according to the invention, Fig. 3 is a side view showing another example of the wind sensing device, and Fig. 4 is a perspective view showing the invention. FIG. 5 is a circuit diagram showing the configuration of the wind sensing device according to the present invention, and FIG. 5 is a waveform diagram for explaining the operation of the circuit. 10... Vinyl house, 11... Skeleton, 12...
...Vinyl sheet exterior body, 13...Rope, 14...
...exhaust fan, 20...wind sensing device, 21...post,
22... Wind receiving plate, 23... Permanent magnet, 24... Reed switch, 25... Stopper, 26... Weight,
27...Slit, 28...One-shot multivibrator, 29...Relay, 30...Contact,
31, 32... Arm, 33, 34... Micro switch.

Claims (1)

[Scope of utility model registration request] An exhaust fan installed in a vinyl house, a pillar installed outside the vinyl house, a wind receiving plate swingably installed on the pillar, and a switch that is turned on and off by swinging of the wind receiving plate; A wind damage prevention device for a vinyl house, comprising a drive circuit that drives the exhaust fan for a certain period of time when the switch is turned on.