JPH0657100B2 - Irrigation control method - Google Patents

Description

DETAILED DESCRIPTION [Outline] One end of a plurality of microtubes is inserted into a trickle pipe, and an inlet portion of the trickle pipe is connected to a nutrient solution supply end via a constant pressure valve or a constant flow valve. In contrast to the so-called free-flowing type irrigation device that irrigates the nutrient solution to the cultivation bed from the other end of the microtube, a bypass is provided in the constant pressure valve or constant flow valve, and opening / closing operation can be performed from the outside during this bypass. A faucet or valve is provided, and an air pool in the irrigation device by temporarily opening the faucet or valve,
The purpose of the present invention is to remove obstacles such as dust, sediment, and scale, to improve the circulation of the nutrient solution in the irrigation device, to ensure irrigation, and to improve the reliability of the irrigation operation of the irrigation device.

[Industrial application field]

The present invention relates to a method for controlling irrigation, more specifically, one end of a plurality of microtubes is inserted into a trickle pipe, and an inlet portion of the trickle pipe is fed through a nutrient solution supply end and a constant pressure valve or a constant flow valve. The present invention relates to a irrigation control method for a irrigation device that is connected and configured to irrigate a cultivation bed with a nutrient solution from the other end of the microtube.

[Conventional technology]

In recent years, hydroponics has spread in the field of agriculture and horticulture, and many liquid supply methods have been proposed for that purpose. Conventionally, most of the hydroponic culture has been a nutrient circulation system, but recently, a large number of pouring systems such as sand cultivation and rock wool cultivation have come to be seen.

In this pouring method, it is very important that the watering is uniform in the longitudinal direction of the cultivation bed. What is different is that the pouring method is different from the circulation method, and the nutrient solution supplied from each irrigation point to the cultivation bed diffuses only in the limited vicinity of the irrigation point and does not move to the entire bed. The reason is that if there is variation in irrigation, it will result in variation in medium water content or nutrients as it is, variation in growth, and eventually a decrease in yield.

Against this background, various irrigation systems have been proposed. Among them, for example, there is an irrigation system as shown in FIG.

FIG. 5 is a perspective view of an example of a known irrigation system. In the figure, 1 is the whole irrigation system, 8 is a trickle pipe,
9,9 'and 9 "are micro tubes, and 10 is a cultivation bed.

The trickle pipe 8 is a pipe having a diameter of, for example, about 20 mm to some extent, and has a considerably smaller inner diameter than that of the trickle pipe 8, for example, about 1 mm, and a long tube, for example, 40 cm or more, that is, a microtube 9. One end 9a is inserted into the trickle pipe 10, and the nutrient solution is irrigated from the other end 9b. 9 ', 9 "etc. are micro tubes 9
It is a microtube configured and arranged in the same manner as.

Cultivated bed 10 to trickle pipe 8 as described above
Also, a watering device is constituted by microtubes 9, 9 ', 9 ", etc. In addition, 11 is a connecting pipe for connecting the nutrient solution supply end and the watering device 1 (trickle pipe).

The irrigation system using this known irrigation device shown in FIG. 5 is excellent in the uniformity of irrigation in the longitudinal direction and is a very excellent method among the free-flow irrigation systems.

[Problems to be solved by the invention]

The condition for uniform irrigation using the above known irrigation device is that the pressure at the nutrient solution inlet portion (the connection portion between the trickle pipe 8 and the connection pipe 11 in FIG. 5) of the irrigation device is lowered to some extent. It is to be. This is because if the pressure of the nutrient solution in this portion is high, there will be a difference in the pressure loss in the longitudinal direction of the irrigation device, resulting in uneven irrigation.

However, in the above-mentioned known irrigation system, when the pressure of the nutrient solution inlet part of the irrigation device is lowered as described above, air accumulates in the trickle pipe, and the microtube insertion end (first When 9a) in FIG. 5 is present, there is a problem in that the air in the air pool is not discharged from the microtube, and accordingly irrigation is not performed. In addition to this air pool, dust, sediment, water scales, etc. also cause trouble.

The present invention solves the above problems in the irrigation system using the above-mentioned known irrigation device, and proposes a irrigation control method capable of always uniform irrigation.

[Means for solving problems]

The present inventors observed the following as a result of closely observing the situation of poor irrigation due to an air reservoir in the irrigation device. First, the air pool was eliminated under high pressure at the nutrient solution inlet portion of the irrigation device, and in this case, no microtube from which the nutrient solution did not flow was observed. It was then observed that air pockets occur once the irrigation is stopped. Based on the above facts, at the start of irrigation, a high pressure is temporarily applied to the irrigation system to eliminate the air pool, and then the irrigation is continued at a low water pressure. And every time other obstacles occur, the above problem can be solved by temporarily applying a high pressure to the irrigation device in the same manner as described above to eliminate air pools and the like, and then continuing irrigation as a low water pressure. It has been found that good irrigation is possible.

Therefore, according to the present invention, one end of a plurality of microtubes is inserted into the trickle pipe, and the inlet portion of the trickle pipe is connected to the nutrient solution supply end via a constant pressure valve or a constant flow valve. The constant pressure valve or constant flow valve is provided with a bypass with respect to the irrigation device for irrigating nutrient solution to the cultivation bed from the other end of the microtube, and a faucet or valve that can be opened and closed from the outside is provided in the bypass. The above problems can be solved by temporarily opening the faucet or valve to remove obstacles such as air pools, dust, sediment, and scales in the irrigation system.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment FIG. 1 is a schematic diagram of piping for a first embodiment of the present invention. In the figure, 1 is the irrigation device shown in FIG. 2, 2 is a constant pressure valve or constant flow valve, 3 and 4 are manual faucets, 8'is one end of a trickle pipe which forms an inlet of the irrigation device, 11 is a connecting pipe, Reference numeral 12 is a supply end of the nutrient solution.

The constant pressure valve or the constant flow valve 2 supplies the original pressure supplied from the nutrient solution supply end 12 to the trickle pipe one end 8 ′ (the connecting portion between the trickle pipe 8 and the connecting pipe 11) forming the inlet portion of the irrigation system 1. It lowers and makes uniform irrigation.

In FIG. 1, in order to perform irrigation with the irrigation device 1, the faucet 3 is first manually opened. At this time, normally, the water faucet 4 provided in the bypass of the constant pressure valve or the constant flow valve 2 is closed.

Although irrigation is started here, the faucet 4 is manually opened. By this operation, a high pressure at the feeding end 12 of the nutrient solution is applied to the inlet portion (one end 8'of the trickle pipe) of the irrigation device 1 through the faucet 4, and as described above, if an air pool is present in the trickle pipe. Even if there is a microtube that is generated and is not irrigated, irrigation is started from the microtube after a short time (5 to 10 seconds) by sweeping away obstacles such as this air pool.

At this time, the faucet 4 is closed. As a result, a low pressure is applied to the inlet portion of the irrigation device 1, and uniform irrigation is performed.

If the above-mentioned air pool or the like occurs in the irrigation, the faucet 4 can be further opened for a short time to remove it.

Alternatively, by periodically opening the water faucet 4 for a short period of time, it is possible to remove air pools and the like and ensure uniform irrigation for a long time.

Second Embodiment FIG. 2 is a schematic diagram of piping for the second embodiment.

The numbers attached to FIG. 2 are the same as those in FIG. However, 5 and 6 are solenoid valves which are replaced with faucets 3 and 4, respectively.

In the second embodiment shown in FIG. 2, instead of manually operating the faucets 3 and 4 in the first embodiment shown in FIG. 1, the solenoid valves 5 and 6 are operated by electric signals. The operation is exactly the same as in the first embodiment.

In the second embodiment, irrigation control of the irrigation system 1 can be performed by remote control.

In the figure, S indicates a solenoid.

Third Embodiment FIG. 3 is a schematic diagram of piping for a third embodiment of the present invention. The numbers in FIG. 3 are the same as those in FIG. Reference numeral 7 is an operation panel for controlling the solenoid valves 5 and 6. The operation panel 7 shown in FIG. 3 is different from that shown in FIG.
The difference is the addition of.

By means of this operating panel 7, that of FIG. 3 operates according to the invention as follows.

When the switch is turned on in the operation panel 7, electric signals are simultaneously sent to the solenoid valves 5 and 6 to open both. Therefore, as described above, high pressure is applied to the inlet portion 8 of the irrigation device to start irrigation. Next, the solenoid valve 6 provided while the constant pressure valve or the constant flow valve 2 is bypassed by a delay relay (not shown) incorporated in the operation panel 7 is short time (for example, 5 seconds).
Later it is automatically closed.

According to this example, a short time (several seconds) after the start of irrigation,
A large amount of nutrient solution was circulated by the high pressure, and none of the microtubes of the irrigation system 1 was not irrigated.

As described above, at the time of starting the irrigation, since the air is not accumulated due to the high pressure, uniform irrigation can be performed thereafter.

In this embodiment as well as in the second embodiment, the remote control is possible and the operation timings of the solenoid valves 5 and 6 are automatically set, so that the operation is simplified.

Fourth Embodiment FIG. 4 is a schematic diagram of piping for a fourth embodiment of the present invention. The numbers in FIG. 4 are the same as those in FIG. In this embodiment, multiple irrigation devices (1 and 1 ')
Irrigation control for 2 ', 6',
Reference numerals 8 ", 11 'and the like respectively denote a constant pressure valve or a constant flow valve for the second irrigation system 1', a solenoid valve provided in the bypass of the valve, one end of the inlet portion of the trickle tube and a connecting pipe. , 13, 13 'are nutrient solution supply ends for the first and second irrigation devices 1, 1'.

In this embodiment, the tubes from the nutrient solution supply end 12 are led to the nutrient solution supply ends 13 and 13 'of the respective irrigation devices 1 and 1'.

The operation of this embodiment is similar to that of the third embodiment and can be easily understood, so the description thereof is omitted.

In fact, there are multiple rows of cultivated beds, and
Since the irrigation device also exists for each cultivation bed, the solenoid valve 5 plays the role of the main plug of the irrigation device for each cultivation bed as in the present embodiment, and the solenoid valves 6, 6 ', etc. bypass each bypass of each cultivation bed. Will play the role of opening and closing. Then, this arrangement and arrangement will be practically used.

〔The invention's effect〕

According to the present invention, there is an effect of improving the reliability of the irrigation system using the trickle pipe and the microtube, which is one of the pouring systems in the hydroponics. Therefore, it is possible for farmers to use the above irrigation system with confidence.
It is very advantageous to carry out hydroponics.

Further, according to the present invention, it is useful not only for eliminating the air pool described above but also for eliminating dust, sediment, water marks, etc. in the irrigation device, and the same effect can be obtained by attaching it to other irrigation system cultivation beds. You can

[Brief description of drawings]

FIGS. 1, 2, 3, and 4 are schematic views of piping for the first, second, third, and fourth embodiments of the present invention, respectively, and FIG. 5 shows a known irrigation system. It is an example perspective view. 1 ... Irrigation device 2 ... Constant pressure valve or constant flow valve 3, 4 ... Manual faucet 5, 6, 6 '... Solenoid valve 7 ... Operation panel 8 ... Trickle pipe 9, 9', 9 "... Micro tube 10 ... Cultivation Bed 11 ... Connection pipe 12 ... Nutrient supply end

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuo Akamatsu 1 Taya-cho, Totsuka-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Mitsuhiko Ota 3-12-1, Nihonbashi, Chuo-ku, Tokyo In Taiyo Kogyo Co., Ltd. (72) Inventor Eiichi Sugano 9-18 Kamiyama-cho, Shibuya-ku, Tokyo Inside Zetsu Kogyo Co., Ltd.

Claims (4)

[Claims] 1. A structure in which one end of a plurality of microtubes is inserted into a trickle pipe, and an inlet portion of the trickle pipe is connected to a feed end of a nutrient solution through a constant pressure valve or a constant flow valve. For the irrigation device that irrigates the nutrient solution from the other end of the microtube to the cultivation bed, a bypass is provided in the constant pressure valve or constant flow valve, and a faucet or valve that can be opened and closed from the outside is provided in the bypass. Alternatively, the irrigation control method is characterized by removing obstacles such as air pools, dust, sediment, and scales by temporarily opening the valve. 2. The irrigation control method according to claim 1, wherein the water faucet provided in the bypass of the constant pressure valve or the constant flow valve can be manually operated from the outside. . 3. The irrigation control method according to claim 1, wherein the valve provided in the bypass of the constant pressure valve or the constant flow valve is an electromagnetic valve. 4. The irrigation control method according to claim 3, wherein the valve provided in the bypass of the constant pressure valve or the constant flow valve is an electromagnetic valve controlled by an operation panel.