JP2019054776A - Sprinkling tube - Google Patents

Abstract

To provide a sprinkling tube capable of suppressing deterioration of a heat insulating effect in a state of water flow, and also suppressing rupture, melting and heat fusion of a water passing portion in a state of no water flow.SOLUTION: A sprinkling tube 10 comprises: a water flow portion 11 which becomes annular when water is passed inside, and has a plurality of sprinkling holes 13 formed for ejecting water from the inside to the outside; and two fin portions 21 which protrude from the water flow portion 11 in directions opposite to each other. The two fin portions 21 are arranged along a vertical direction in a state of being supported by a ceiling. The plurality of sprinkling holes 13 are formed below the center of the flow portion 11, in a state of being supported by the ceiling and in a state of water flow inside the water flow portion 11, so that the water is sprinkled toward a lower direction than a horizontal direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a watering tube.

  Conventionally, in agricultural facility horticulture, vegetables and the like are cultivated using an agricultural house such as a so-called plastic house.

  In such an agricultural house, if the temperature in the house is excessively lowered due to the external environmental temperature, the growth of vegetables and the like may be adversely affected. Particularly in winter, the temperature in the house tends to decrease.

  Therefore, an agricultural sheet house is provided with an inner sheet member that covers the inner space, and an outer sheet member that covers the inner sheet member with an interval from the inner sheet member from the outside. The watering tube is suspended from the ceiling of the outer sheet member so as to be positioned between the inner sheet member and the inner sheet member, groundwater is supplied to the watering tube, and the watering tube is sandwiched between the two sheet members. Sprinkling groundwater, which exhibits a stable temperature of about 13 to 14 ° C., throughout the year. Sprinkling water from the water spray tube into such a space is called a water curtain.

  For example, during the daytime in winter, the temperature on the ground becomes higher than the temperature of groundwater due to irradiation of sunlight or the like. On the other hand, at night, the temperature of groundwater becomes higher than the temperature on the ground due to cooling. Therefore, it is possible to suppress a decrease in the temperature in the house by spraying groundwater having a temperature higher than the outside air from the watering tube into the space between the two sheet members at night. Conversely, the supply of groundwater to the watering tube is stopped during the daytime. According to the method of watering in this way, fuel becomes unnecessary compared to a stove for the purpose of nighttime heating in the house, and thus energy and cost are reduced.

  As a water spray tube used for this type of water curtain, for example, a nozzle member is provided in a hard water passage portion (the shape does not change due to water passage) such as a water passage portion made of vinyl chloride or a water passage portion made of fiber reinforcement. The attached one is installed (first conventional watering tube). In such a sprinkling tube, the nozzle member that sprinkles the water in the tube to the outside is attached to the tube as a water passing portion with holes at appropriate intervals, radially toward the entire circumference of the nozzle member, or Water is sprayed horizontally in a fan shape toward one direction (for example, both sides) of the tube. This nozzle member is installed so as to be positioned above the center of the water passage portion (that is, near the top of the tube) above the center of the water passage portion (that is, a virtual plane along the horizontal direction through the center of the water passage portion).

  In such a watering tube, since the water passing portion is hard, it takes labor and cost to hang and install it from the ceiling of the house, and the cost of the watering tube itself is high. Moreover, the shape of a water flow part does not change by water flow and the stop of water flow. Therefore, even if the water flow to the water passage portion is stopped, the pressure for discharging the water inside the water passage portion from the nozzle does not occur, and it is difficult for the water to be discharged from the inside of the water passage portion.

  On the other hand, as the watering tube, for example, a soft passage such as low-density polyethylene in which a plurality of watering holes are formed in a tube as a water passing portion (swells in a ring shape by water flow and becomes flat when the water flow is stopped). What is provided with the water part and the fin part which protrudes in the mutually opposite direction from the water flow part is also installed (2nd conventional watering tube). In such a soft water spray tube, the two fin portions are installed so as to be positioned in the horizontal direction, and at least water spray holes are provided below the center of the water flow portion in a state where water is passed through the water flow portion. It forms so that it may be located and is installed in the ceiling (refer patent document 1).

  In such a watering tube, since the water passing portion is soft, the shape of the water sprinkling tube swells and becomes annular due to water passing. On the other hand, when the water pressure disappears due to the stoppage of water flow, water is discharged from the lower sprinkling holes, and the volume of the water flow portion is reduced by the amount of water discharged. Get closer.

JP 2000-176319 A

  However, in the first conventional watering tube, when water flow to the water passage portion is stopped, water remains in the water passage portion. For example, after harvesting crops in a house, water flow to groundwater is stopped because groundwater flow is not required. Will remain. However, if the temperature in the house decreases to 0 ° C. or lower with the water remaining, the remaining water may freeze, and the water flow portion may burst.

  In particular, when a rigid pipe made of vinyl chloride is used as a water flow portion, if water flow is continued for a long period of time, the water flow portion between the portions supported by the suspension will become water in the water flow portion. Due to the weight of the pipe and the weight of the pipe itself, a phenomenon of creep deformation downward tends to occur. When the water flow section creeps, the direction of the nozzle member changes accordingly, and the water sprayed from some nozzle members is tilted so as to be directed upward. It comes in contact with the sheet member. As described above, when the water hitting the outer sheet member is frozen at night, a icicle (ice column) is formed. When the icicle once formed is melted by sunlight during the day, the icicle may fall and fall on the inner sheet member to make a hole in the inner sheet member. When a hole is made in the inner sheet member, the water sprayed at night falls on the crop through this hole, and as a result, the crop has an adverse effect such as the occurrence of illness, quality deterioration, and yield loss. Problems may occur.

  In the second conventional water spray tube, when the water flow to the water flow portion is stopped, the water is discharged from the water spray holes formed on the surface of the water flow portion, so that the water flow portions overlap with each other, and is close to a flat plate shape. Since it will be in a state, the amount of water remaining in the water flow portion is reduced. Therefore, even if this remaining water freezes and expands, it does not exceed the permissible volume (the limit volume for bursting) in the water passage portion, and therefore the possibility that the water passage portion will burst is low.

  However, when water is discharged from the water flow portion, the water flow portion approaches a horizontal flat plate shape, and an area corresponding to the bottom surface increases, and water in the water flow portion flows toward the bottom surface. For this reason, even if the amount of water in the water passage portion is reduced, many water spray holes will be arranged on the bottom surface of the water passage portion, and water will collect on this bottom surface. The number of sprinkling holes from which water is discharged will not be greatly reduced.

Here, the water to be passed is groundwater or the like, and this water often contains foreign matters such as fine sand.
This foreign matter is accompanied by the flow of water and spreads to the bottom surface where many water spray holes are arranged. Further, foreign matter in the water tries to pass through the sprinkling holes along with the flow of drainage from the sprinkling holes present on the bottom surface of the water flow portion.
During this passage, foreign substances having a size close to the diameter of the water spray holes may be clogged.
And once a foreign substance is clogged in a water spray hole, it becomes impossible to fulfill the function as a water spray hole, and as a result, the heat retention effect at night falls.
Such foreign matter is usually filtered by a filter or the like before passing through the water passing portion, but it is difficult to completely filter out the foreign matter. A small amount of foreign matter having a particle size of about a degree can be contained.

On the other hand, when the water inside the water passage is drained and the water passage becomes flat, during the day when water is not passed, The material constituting the water flow part melts and deforms into an uneven shape, or the upper and lower sides of the overlapping water flow parts melt while they are in contact with each other, causing a phenomenon in which both are fused. There is a case.
In particular, when the overlapping parts of the water-passing part are fused, the water-passing part does not open sufficiently even after passing the water again at night after the sun has settled and cooled, and as a result flows through the water-passing part There is a possibility that the flow rate of water is lowered and the effect of keeping warm at night cannot be sufficiently obtained.
Also, such melting and fusion occurs particularly when the watering tube is installed on the ceiling, and hardly occurs when the watering tube is installed on the side of the agricultural house.

  In this way, there is a risk that the warming effect at night will be reduced due to the occurrence of icicles or clogging of sprinkling holes when water is passed, and due to freezing etc. when water is not passed There is a risk of rupture of the water-passing part, or melting of the water-passing part or heat fusion caused by sunlight hitting the daytime. Therefore, it is desired to suppress these.

  In view of the above circumstances, the present invention can suppress a decrease in heat retention effect in a state where water is passed, and can suppress rupture of a water passing portion in a state where water is not passed, and melting and heat fusion. It is an object to provide a watering tube.

  In order to solve the above-mentioned problems, the present inventors have conducted extensive research and found the following knowledge.

  That is, in the first conventional watering tube, since the nozzle member is positioned above the center of the water passage portion and the water passage portion is not deflated, if water is not discharged by the drainage mechanism, The pressure required to discharge water from the nozzle inside the section is not sufficiently generated. It is considered that this causes water to remain inside the water passage portion, and this water expands due to freezing and ruptures the water passage portion formed of a hard material.

Here, in order to discharge water from the nozzle member, it is also conceivable to form a water spray hole below the center of the water flow portion.
However, in this case, when the water is being passed, foreign matter having a specific gravity greater than water, such as sand, contained in the water such as groundwater passes through the nozzle member. The member is likely to be blocked.
On the other hand, when the water flow is stopped, there is a possibility that a problem that water drops intensively from nozzles installed at regular intervals may occur.
Therefore, in order to suppress the drop of water, it is conceivable to provide a nozzle with a valve that opens when a certain water pressure is exceeded.
However, in this case, if water drainage is neglected when the water flow is stopped, the water in the water flow section will not be discharged at all, so the amount of water remaining inside the water flow section May increase and the water passing portion may be easily ruptured.

  It has been found that due to the above cause, the first conventional water spray tube may cause the water flow portion to rupture while water flow is stopped.

  In the first conventional water spray tube having such a hard water flow portion, the shape of the water flow portion does not change even when the water flow is stopped. Wear is unlikely to occur.

On the other hand, in the 2nd conventional watering tube which has a soft water flow part, when water flow is stopped, it will naturally water from a lower watering hole among many watering holes formed in a water flow part. Thus, as described above, the water-flowing portion that was in the shape of a column approaches a flat shape so as to overlap.
For this reason, there is little risk of rupture due to freezing.
However, in the second conventional water spray tube, since the two fin portions are arranged along the horizontal direction, as described above, in the process of drainage, the water passage portion approaches a flat plate shape along the horizontal. There is a possibility that foreign matter contained in the water and having a specific gravity greater than that of water may be clogged in the sprinkling holes located particularly on the bottom surface side of the water passage portion.

Moreover, if the water inside a water flow part is further discharged | emitted, a water flow part will overlap in the flat form along a horizontal direction. If left untreated in this state, the cause is not clear, but the overlapped part may be melted by daytime sunlight irradiation, which may result in heat fusion.
Specifically, in a clear sky condition, under a condition in which water does not adhere to the outer sheet member, in the house, the water passing portion is overlapped so as to be along the horizontal direction and is flat. An experiment was conducted to measure the temperature of the conventional watering tube. As a result, the temperature of the upper surface of the water passage may rise to around 60-70 ° C. after noon when the sun is located at the highest altitude and the amount of solar radiation is highest during the day. all right.
Here, in the second conventional watering tube, the crystal melting point of the low density polyethylene resin generally used in the water passing portion is 110 ° C. to 130 ° C., and when the surface temperature rises as described above, It is difficult to think of adverse effects such as melting or deformation on the water.
However, in general, water may accumulate on the outer sheet member due to weather conditions such as the shape of the house, the amount of condensed water at night, and rainfall, and the function of the lens that causes the sunlight to converge It has been reported that a converging fire has occurred in the house.
Considering this, the cause is not clear, but the pool of water generated on the ceiling of the outer sheet or the like collects sunlight on the surface of the water flow section after noon when the amount of solar radiation is large. It is presumed that there is a possibility that melting or fusing of the water passing portion may occur.

On the other hand, it is common practice to install the watering tube on the side part of the agricultural house such as a column extending in the vertical direction so that the fin part is along the horizontal direction. Even so, there is almost no melting or fusing of the water flow section. The reason for this is considered to be that when the watering tube is installed on the side, it is difficult for sunlight to be condensed on the watering tube even if it becomes flat along the horizontal direction by drainage.
As described above, the melting and fusing of the water flow portion can occur specifically when the watering tube is installed on the ceiling regardless of the arrangement of the two fin portions.

  Based on these findings, the present inventors conducted further research and found that a soft water passing portion, that is, a water sprinkling tube having a water passing portion that is circular when passed and two fin portions, A water spray hole is formed below the center of the water passing portion so that the water is sprayed downward from the horizontal direction in a state where the water is passed along the vertical direction. Therefore, it is possible to suppress a decrease in the heat insulation effect at night caused by occurrence of icicles or clogging of sprinkling holes in a state where water is passed, and in a state where water is not passed, freezing etc. It has been found that the rupture of the water passage portion caused by it and the occurrence of melting and heat fusion of the water passage portion caused by sunlight hitting during the day can be suppressed.

  Then, the inventors have further studied earnestly based on the above findings, and have completed the present invention.

That is, the watering tube according to the present invention is
A watering tube supported on the ceiling of an agricultural house,
A water flow part formed into a ring shape by passing water through the inside, and formed with a plurality of sprinkling holes for ejecting the internal water to the outside;
Two fin portions projecting in opposite directions from the water flow portion,
In the state supported by the ceiling, the two fin portions are arranged along the vertical direction,
In a state of being supported by the ceiling and being passed through the interior of the water passage, water is sprayed toward the lower side of the horizontal direction, below the center of the water passage, The plurality of water spray holes are formed.

  Here, “below the center of the water flow portion” means “below the virtual plane along the horizontal direction through the center of the water flow portion”.

According to such a configuration, the water is sprayed downward from the horizontal direction while being supported by the ceiling and being passed through the interior of the water passage, so that the water is sprayed from the center of the water passage. When water flow is stopped due to the formation of multiple water holes on the lower side (that is, the lower half), water is drained from the water holes formed in the lower half of the water flow part. Water can be discharged sufficiently from the water.
Therefore, it can suppress that a water flow part bursts by freezing.

  In addition, when the two fin portions are arranged along the vertical direction while being supported by the ceiling, the water flow is stopped and the water flow portions are overlapped (the shape before the water flow and Thus, even if it is deflated to a flat shape, the posture is maintained by the two fin portions, whereby it is possible to suppress the water passing portion from being bent so as to protrude downward. When the water flow is stopped, the cross-sectional shape of the water flow portion that was circular at the time of water flow is the left and right (both sides outside the vertical line in the horizontal direction) so as to approach the vertical line that connects the fins that exist above and below Swelling is reduced, and finally, the left and right portions are not perfect, but have a flat shape close to a flat plate extending vertically.

  Here, at the time of water flow, the foreign matter contained in the water and having a specific gravity greater than that of water flows through the water flow portion while being stirred by the flow of water. At this time, the foreign matter is not uniformly distributed in the water passage due to its own weight. Moreover, since the sedimentation speed | rate becomes large, so that the foreign material with a large particle diameter becomes large, it is estimated that it distributes below.

  On the other hand, after the water flow is stopped, water is drained from the water sprinkling holes, and when the shape of the water flow portion becomes vertically long, the larger the particle size and hence the larger the sedimentation speed, the earlier the inside of the water flow portion. Deposit at the bottom. That is, it deposits in the vicinity of the region where the lower fin portion is formed in the region where the two fin portions where the sprinkling holes are not normally formed are formed. As a result, relatively large foreign matters that cause clogging of the water sprinkling holes are concentrated and stored in a region where the water sprinkling holes are not formed in the drainage process. The foreign matter stored in this way is difficult to follow the flow of water toward the water spray hole. Therefore, since the probability that the foreign matter closes the water spray hole is reduced, a decrease in the heat retaining effect due to this is suppressed.

Moreover, the shape of a water flow part becomes close to the flat plate shape extended vertically by drainage. Thereby, after noon when the amount of solar radiation becomes maximum during the day, the angle of the surface of the water passage portion with respect to sunlight becomes smaller than when installed in a horizontally extending flat plate shape. Therefore, even if a puddle is formed on the ceiling of the house and the focus of sunlight formed by the lens effect due to this puddle matches the surface of the water passage, the radiation energy of the sunlight will be The density transmitted to the surface is reduced. That is, the thermal energy absorbed by the surface of the water passage is reduced. As a result, the temperature rise on the surface of the water passage is suppressed.
Therefore, since melting | fusing and heat sealing | fusion of a water flow part can be suppressed, the fall of the heat retention effect resulting from this is suppressed.

  Thus, the fall of the heat retention effect in the state where water is passed can be suppressed, and the rupture of the water passage part in the state where water is not passed, and melting and heat fusion can be suppressed.

In the watering tube having the above configuration,
The agricultural house has an inner sheet member that covers the inner space of the agricultural house, and an outer sheet member that covers the inner sheet member with an interval from the inner sheet member from the outside. And
The upper part of the inner sheet member and the upper part of the outer sheet member form the ceiling,
It is preferable to be supported between the outer sheet member and the inner sheet member.

According to such a configuration, the water spray tube is supported so as to be positioned between the outer sheet member and the inner sheet member, thereby allowing water to pass through the space between the sheet members via the water spray tube. it can.
Thereby, the temperature of this internal space can be adjusted, without sprinkling water directly in the space for growing the agricultural product inside the agricultural house.
For example, water having a temperature higher than that of the external environment such as ground water can be sprayed between the upper sheet members at night in winter, thereby increasing the temperature of the internal space of the agricultural house (keep warm). be able to.
And when it has such an inner and outer sheet | seat member, the fall of the heat retention effect in the state by which water is passed is suppressed, and the rupture of the water flow part in the state where water is not passed, and melting, Since heat fusion can be suppressed, a water spray tube becomes more useful.
Here, as described above, in the case where the inner and outer sheet members are provided, if the water spray hole is formed above the center of the water flow portion, the water ejected from the water spray hole is The water that collides with the outer sheet member, particularly in the winter season, may grow into icicles. In this case, when the icicle falls due to sunlight irradiation in the daytime, the dropped icicle may break through the inner sheet member, and as a result, the heat retaining effect of the internal space of the agricultural house may be reduced.
However, in such a case, since the water spray hole is formed below the center of the water flow portion, it is possible to suppress the water ejected from the water spray hole from flying toward the outer sheet member. it can. Therefore, the fall of the above heat retention effects can be suppressed.

In the watering tube having the above configuration,
The plurality of water spray holes are formed so that the inner peripheral surfaces of the plurality of water spray holes are tapered toward the inside from the outside of the water flow section in a state where water is passed through the water flow section. It is preferable.

Here, if foreign matter is mixed in the water supplied to the inside of the water flow section, the foreign matter may enter the water spray hole and the water spray hole may be clogged.
However, according to the above configuration, the plurality of water spray holes are formed so that the inner peripheral surface is tapered toward the inner side from the outer side, so that the foreign surface enters the water spray hole. Water spray holes that taper toward the outside and water spray holes whose inner peripheral surface diameter is constant from the inside to the outside can be suppressed.
In particular, in the case where the inner and outer sheet members are provided and a water passage is provided between the two sheet members, a water spray tube is formed when a foreign object enters the water hole and the water hole is closed. It is very troublesome to exchange. However, since the intrusion of foreign matters is suppressed as described above, such labor for replacement is reduced.

  As described above, according to the present invention, it is possible to suppress a decrease in the heat retention effect in a state where water is passed, and to suppress rupture of the water passing portion in a state where water is not passed, and melting and heat fusion. A resulting watering tube is provided.

The schematic side view which shows an example of the state in which the watering tube of one Embodiment of this invention was installed in the agricultural house The schematic perspective view which shows the watering tube of this embodiment Schematic which shows the vertical cross section of the watering tube which has the watering hole (vertical watering hole) of this embodiment. Schematic diagram schematically showing a state in which water is ejected from the vertical watering hole of FIG. The schematic side view which shows the state by which the watering tube of this embodiment is not water-flowing The schematic perspective view which shows the state by which the watering tube of this embodiment is not water-flowing The graph which shows the temperature transition in the agricultural house when installing the watering tube of Examples 1, 2 and Comparative Example 1

  Hereinafter, a watering tube according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1-4, the watering tube 10 of this embodiment is
A watering tube 10 supported on the ceiling 3 of the agricultural house 1,
A water passage portion 11 in which water is passed and a plurality of sprinkling holes 13 for ejecting the internal water to the outside are formed;
Two fin portions 21 projecting in opposite directions from the water flow portion 11,
In the state supported by the ceiling 3, the two fin portions 21 are arranged along the vertical direction (vertical direction in FIGS. 1 to 3),
In the state supported by the ceiling 3 and being passed through the interior of the water passage portion 11, the water is sprayed downward from the horizontal direction (left and right direction in FIGS. 1 and 3). The plurality of water spray holes 13 are formed at a position below the center O of the water flow portion 11 (that is, below the virtual plane S along the horizontal direction through the center O of the water flow portion 11). Has been.

The watering tube 10 is installed on the ceiling 3 of the agricultural house 1.
In this embodiment, the agricultural house 1 covers the inner sheet member 5 that covers the inner space of the agricultural house 1 and the inner sheet member 5 from the outer side with a gap from the inner sheet member 5. And an outer sheet member 7.
In this case, the upper portions 5 a and 7 a of the inner sheet member 5 and the outer sheet member 7 form the ceiling 3.
The water spray tube 10 is supported so as to be positioned between the outer sheet member 7 and the inner sheet member 5. For example, it is suspended and supported by the upper part 7a of the outer sheet member 7 via a jig, or is supported by the upper part 5a of the inner sheet member 5 via a jig.

  In the embodiment shown in FIG. 1, the water spray tube 10 is suspended from the ceiling 3 (here, the upper portion 7 a of the outer sheet member 7) via a suspension jig 9 that is spaced apart in the longitudinal direction. .

As shown in FIGS. 2 to 4, the water spray tube 10 is formed such that water is passed through the interior thereof, and the water passage is formed with a plurality of water spray holes 13 for ejecting the internal water to the outside. Part 11 is provided.
The water ejected from the water spray tube 10 falls onto the inner sheet member 5 and is drained to the ground through the inner sheet member 5.

The water passing portion 11 is a portion through which water is passed and water is ejected from the plurality of sprinkling holes 13.
Water is supplied (passed through) from a water supply device (not shown) into the water passage 11.
Examples of water to be supplied include groundwater and tap water.
When water is not passed, the water spray tube 10 is deflated and flat as shown in FIGS.
On the other hand, the water flow portion 11 is formed in a cylindrical shape in a state where water is passed through the inside.

Although the thickness of the water flow part 11 is not specifically limited, For example, 0.1-5.0 mm is preferable, 0.15-4.0 mm is more preferable, 0.15-3.0 mm is further more preferable.
If the thickness of the water passage portion 11 is less than 0.1 mm, the water passage portion 11 may be deformed or ruptured when water is injected into the water passage portion 11 and pressurized. On the other hand, when the thickness of the water flow portion 11 is 0.1 mm or more, such deformation and rupture can be suppressed.
If the thickness of the water flow portion 11 exceeds 5.0 mm, the rigidity and weight of the water flow portion 11 will increase excessively, and winding of the water flow portion 11 and sprinkling holes 13 in the water flow portion 11 will be performed. There is a risk that drilling to form may be difficult. On the other hand, when the thickness of the water flow portion 11 is 5.0 mm or less, it is possible to prevent the rigidity and weight from being increased excessively. It can be suppressed.

The inner diameter (diameter) of the water passage portion 11 in a state where water is passed is preferably 5 to 200 mm, more preferably 10 to 150 mm, and still more preferably 15 to 100 mm.
When the inner diameter is smaller than 5 mm, the pressure loss in the longitudinal direction of the tube in the water sprayed state becomes large, and the water spraying distance is shortened as soon as it leaves the water inlet. On the other hand, when the inner diameter is larger than 200 mm, even if water is injected at the same water pressure, it is not preferable because it is easily broken in strength compared to a tube having a relatively small inner diameter.

The plurality of sprinkling holes 13 are supplied with water from the water flow section 11, and eject water to the outside by the water pressure in the water flow section 11.
The plurality of water spray holes 13 are formed below the virtual plane S along the horizontal direction (left-right direction in FIG. 3) through the center O in the water flow portion 11.
The plurality of water sprinkling holes 13 are formed in a desired pattern in the circumferential direction (but below the virtual plane S) and the longitudinal direction of the water flow portion 11.

If the position of the water spray hole 13 in the circumferential direction of the water flow portion 11 (that is, the position in the cross section perpendicular to the longitudinal direction) is below the center O (that is, below the virtual plane S), in particular. It is not limited and can be set appropriately.
That is, the position of the sprinkling hole 13 is such that an angle θ formed by a virtual straight line extending vertically downward from the center O and a virtual straight line connecting the center O and the center of the sprinkling hole (center of the outer opening) is It is not particularly limited as long as it is less than ± 90 ° (that is, in the range of 0 ° or more and less than 90 ° and more than −90 ° and 0 ° or less, in other words, 0 ° or more and less than 90 ° in absolute value). In this range, it can be set as appropriate. Of these, clogging tends to occur when the angle θ indicating the drilling position is smaller than ± 5 °. Further, since the distance between the water spray hole 13 and the inner sheet member 5 is shortened, the sprayed water spreads only within a very limited range of the inner sheet member 5 and the heat retention efficiency tends to be lowered. Therefore, considering the viewpoint of suppressing clogging and a decrease in heat retention efficiency, the angle θ is preferably ± 5 ° or more, and more preferably ± 10 ° or more.
For example, the position of the water spray hole 13 can be set to a position where the angle θ is in the range of 15 ° to 80 ° in absolute value.
Since the position of the water sprinkling hole 13 is a position within this range, it is possible to prevent the water sprayed from hitting the ceiling 3 and generating wiggles. In addition, water can be widely sprayed in a direction perpendicular to the longitudinal direction of the water passage portion 11, and the heat retention efficiency is thereby improved.

The shape of the water spray hole 13 is not particularly limited.
For example, in this embodiment, as shown in FIGS. 3 and 4, the inner peripheral surface 15 of the water sprinkling hole 13 is outside (front side) of the water passage 11 in a state where water is passed through the water passage 11. A plurality of water spray holes 13 are formed so as to taper from the inner side (back side) toward the inner side (that is, from the downstream side to the upstream side in the water passage direction).

For example, as the water sprinkling hole 13, as shown in FIGS. 3 and 4, the vertical water sprinkling hole 13 a extending in a direction perpendicular to the tangent line in contact with the water passing portion at the water sprinkling hole 13 (the thickness direction of the water passing portion 11). Is mentioned. As shown in FIG. 4, water is ejected from the vertical water spray hole 13a in a conical shape centering on an imaginary straight line (not shown) passing through the center of the inner opening and the center of the outer opening. In addition, the shape of the watering hole 13 is not specifically limited, The shape of a well-known watering hole can be employ | adopted.
For example, the shape of the cross section of the water spray hole 13 (the cross section along the direction perpendicular to the thickness direction of the water passage portion 11) may be elliptical or slit-like in addition to the circular shape.
The shape of the vertical cross section (cross section along the thickness direction of the water flow portion 11) of the water spray hole 13 can be appropriately set so that water is sprayed below the horizontal direction.

In the present embodiment, the hole diameter (diameter) of the outer opening of the water sprinkling hole 13 (vertical sprinkling hole 13a) in the planar state is the most of the inner peripheral surface 15 (15a) from the outer side to the inner side of the water flow portion 11. The hole diameter is wide. The hole diameter of the outer opening is not particularly limited as long as it is the largest hole diameter as described above. For example, 0.06 to 5. 0 mm is preferable.
If the hole diameter of the outer opening of the sprinkling hole 13 exceeds 5.0 mm, the flow rate of the water flowing into the sprinkling hole 13 increases, so that there is a possibility that the longness of the water flow portion 11 is deteriorated.
If the hole diameter of the outer opening of the sprinkling hole 13 is less than 0.06 mm, foreign matter such as sand may enter the sprinkling hole 13 to cause clogging.
On the other hand, when the hole diameter on the outer side of the water spray hole 13 is 0.06 to 5.0 mm, the above problem is suppressed.
In addition, the said hole diameter means the value converted into the diameter of the perfect circle which has the same area as the area of each opening, when the shape of each opening is not a perfect circle.

The hole diameter (diameter) of the inner opening of the water spray hole 13 (vertical water spray hole 13a) in the planar state is the hole diameter of the narrowest portion of the inner peripheral surface 15 (15a) from the outer side to the inner side of the water flow part 11. is there. The hole diameter of the inner opening is not particularly limited as long as it is the smallest hole diameter as described above. For example, 0.05 to 2. 0 mm is preferable.
If the hole diameter of the inner opening of the sprinkling hole 13 exceeds 2.0 mm, the flow rate of water flowing into the sprinkling hole 13 increases, so that there is a possibility that the longness of the water passage portion 11 is deteriorated.
If the hole diameter of the inner opening of the sprinkling hole 13 is less than 0.05 mm, there is a possibility that foreign matter such as sand enters the sprinkling hole 13 to cause clogging.
On the other hand, when the hole diameter of the inner opening of the water spray hole 13 is 0.05 to 2.0 mm, the above-described problem is suppressed.

  The ratio of the hole diameter (diameter) of the inner opening and the hole diameter (diameter) of the outer opening in the water spray hole 13 (vertical water spray hole 13a) in the planar state is not particularly limited. To 1:20 (inner opening hole diameter: outer opening hole diameter = 1: 1.1 to 1:20), the hole diameter is preferably adjusted.

  The water spray tube 10 includes two fin portions 21 that protrude in opposite directions from the water flow portion 11 in a state where the water spray tube 10 is installed and water is passed through the water flow portion 11. The two fin portions 21 protrude from both end portions of the water passage portion 11 that are farthest from each other.

  By providing this fin part 21, the water flow part 11 becomes difficult to bend in the longitudinal direction.

  The material of the water flow part 11 and the fin part 21 is not specifically limited. Examples of these materials include resin, rubber, metal, and the like. Among these, the water sprinkling hole 13 and the fin portion 21 can be easily formed in the water flow portion 11 at a low cost, and the water sprinkling tube 10 becomes light in weight and has excellent winding properties during use. Such a material is preferable. From this viewpoint, the material is preferably a resin. Examples of such resins include polyolefin resins such as polyethylene and polypropylene, and polyester resins such as polycarbonate and polyethylene terephthalate. Of these, polyethylene is preferred, and examples of the polyethylene include low density polyethylene and high density polyethylene. In particular, when the watering tube 10 is used in a higher temperature and higher pressure environment, such as 30 ° C. or higher and 0.30 MPa or higher, for example, a combination of low density polyethylene and high density polyethylene in that it can withstand that environment. Is preferred. In addition, when the resin water passage 11 is perforated by laser light irradiation, it is preferable to add carbon black to the resin, which makes it easier for the water passage 11 to absorb the energy of the laser light. Therefore, drilling becomes easy.

  In the watering tube 10 of this embodiment, the quantity of the watering hole 13 is not specifically limited.

  Moreover, even if the water sprinkling hole 13 is only the above-mentioned vertical water sprinkling hole 13a, it may be only a non-vertical water sprinkling hole (not shown), or these may be combined.

  Further, the plurality of water spray holes 13 may include water sprinkling holes other than the water sprinkling holes 13 formed so that the inner peripheral surface is tapered from the outside toward the inside as described above.

The manufacturing method of the watering tube 10 is not specifically limited.
For example, as shown in FIGS.
Using the two long raw fabric sheets 17 formed from the resin as described above,
Forming a plurality of water spray holes 13 in at least one of the two raw fabric sheets 17 by punching from one side to the other side;
By superimposing the two original fabric sheets 17 and heat-sealing both ends,
The watering tube 10 provided with the water flow part 11 which has the watering hole 13, and the fin part 21 can be manufactured.

For example, by punching in at least one of the two original fabric sheets 17 from the one surface side toward the other surface side, a plurality of openings are formed such that the opening on the one surface side is larger than the opening on the other surface side. Forming the sprinkling holes 13;
By superimposing the two original fabric sheets 17 so that the opening on the other surface side is located on the inside and heat-sealing both ends,
As shown in FIGS. 3 and 4, a water spray tube 10 including a water flow portion 11 having a water spray hole 13 formed so that the inner peripheral surface 15 tapers toward the inside from the outside, and a fin portion 21. Can be manufactured.
In addition, a die having a cylindrical slit-shaped opening is attached to the tip of the extruder in the vertical direction upward or downward, and a resin-made cylindrical tube is created using the extruder equipped with the die. The water spray tube 10 can also be manufactured by punching the water spray hole 13 at the position, and then folding it in half and heat-sealing both ends.

  Examples of the method for perforating include irradiating the water passing portion 11 with laser light. In addition, a method of drilling using a drill, a punch, a cutting tool, a drilling needle, or the like is also included.

By using the watering tube 10 of this embodiment, watering can be performed.
That is, the watering method of this embodiment is a method of watering using the watering tube 10 of this embodiment.

Specifically, as described above, in the agricultural house 1 in which the watering tube 10 is installed, water is ejected from the watering hole 13 of the watering tube 10 by supplying water to the watering tube 10 from a water supply unit (not shown). Let the watering.
In the present embodiment, water is sprayed in the space between the inner sheet member 5 and the outer sheet member 7.

  The water pressure (water supply pressure) in the water passage 11 in a state where water is passed through the water passage 11 of the water spray tube 10 is preferably 0.05 MPa to 1.0 MPa, and 0.05 MPa to 0.60 MPa. More preferred.

As described above, the watering tube 10 of the present embodiment is
A watering tube 10 supported on the ceiling 3 of the agricultural house 1,
A water passage 11 having a plurality of sprinkling holes 13 formed into an annular shape by passing water through the inside and ejecting the internal water to the outside;
Two fin portions 21 projecting in opposite directions from the water flow portion 11,
In the state supported by the ceiling 3, the two fin portions 21 are arranged along the vertical direction,
More than the center O of the water flow portion 11 so that the water is sprayed downward from the horizontal direction while being supported by the ceiling 3 and being passed through the water flow portion 11. The plurality of water spray holes are formed on the lower side.

According to such a configuration, the water passage portion 11 is supported by the ceiling 3 and is sprayed toward the lower side than the horizontal direction while being passed through the water passage portion 11. When the water flow is stopped by forming a plurality of water spray holes 13 below the center O (that is, the lower half), water is drained from the water spray holes 13 formed in the lower half of the water flow part 11. Therefore, the water can be sufficiently discharged from the water passage portion 11.
Therefore, it can suppress that the water flow part 11 bursts by freezing.

  In addition, when the two fin portions 21 are arranged along the vertical direction while being supported by the ceiling 3, the water flow is stopped and the water flow portions 11 are overlapped (before water flow). Even if it is deflated flatly, the posture is maintained by the two fin portions 21, thereby suppressing the water passage portion 11 from being bent so as to protrude downward. When the water flow is stopped, the cross-sectional shape of the water flow portion 11 that was annular at the time of water flow is left and right (both outside the vertical line in the horizontal direction) so as to approach the vertical line connecting the fin portions present above and below. In the end, the left and right portions are not perfect, but become flat like a flat plate extending vertically.

  Here, at the time of water flow, the foreign matter contained in the water and having a specific gravity greater than that of the water flows through the water flow portion 11 while being stirred by the flow of water. At this time, the foreign matter is not uniformly distributed in the water passing portion 11 due to its own weight. Moreover, since the sedimentation speed | rate becomes large, so that the foreign material with a large particle diameter becomes large, it is estimated that it distributes below.

  On the other hand, after the water flow is stopped, when the water is drained from the water sprinkling holes 13 and the shape of the water flow portion 11 becomes vertically long, the foreign matter having a larger particle diameter and hence a larger sedimentation speed is passed through earlier. It accumulates at the lowest end in the part 11. That is, it deposits in the vicinity of the region where the lower fin portion 21 is formed in the region where the two fin portions 21 where the sprinkling holes 13 are not normally formed are formed in the water flow portion 11. As a result, relatively large foreign matter that causes the water spout 13 to be blocked is concentrated and stored in the drainage process in the region where the water spout 13 is not formed. The foreign matter stored in this way is difficult to follow the flow of water toward the sprinkling hole 13. Therefore, since the probability that the foreign matter closes the sprinkling holes 13 is reduced, a decrease in the heat retention effect due to this is suppressed.

Moreover, the shape of the water flow part 11 becomes close to the flat plate shape extended vertically by drainage. Thereby, the angle of the surface of the water flow part 11 with respect to sunlight becomes smaller than the case where it installs in the flat plate shape extended horizontally after noon when the amount of solar radiation becomes the maximum during the daytime. Therefore, even if a puddle is formed on the ceiling of the house and the focal point of sunlight formed by the lens effect by this puddle matches the surface of the water flow portion 11, the water flow portion of the radiation energy due to sunlight. The density transmitted to the surface of 11 is reduced. That is, the thermal energy absorbed by the surface of the water flow portion 11 is reduced. As a result, the temperature rise of the surface of the water flow part 11 is suppressed.
Therefore, since melting | fusing and heat fusion of the water flow part 11 can be suppressed, the fall of the heat retention effect resulting from this is suppressed.

  Thus, the fall of the heat retention effect in the state where water is passed can be suppressed, and the rupture of the water passage part 11 in the state where water is not passed, and melting and heat fusion can be suppressed.

  In addition, although a watering tube may be installed on the side wall of the house, it is not usually installed at such a position for the purpose of keeping warm at night. For example, when installing a watering tube on the ground, the watering tube is installed for other purposes (eg, watering to agricultural products) other than the heat insulation effect at night. In general, a watering tube is installed on the side wall of the house. Thus, when installing in a side part, even if it installs a watering tube so that two fin parts may follow a perpendicular direction, fusion and fusion of a water flow part hardly occur.

  When the watering tube is installed on the side wall of the house as described above, the side wall is usually arranged along the vertical direction, and a water pool that causes light collection is unlikely to occur. Moreover, even when installed in a relatively high place near the ceiling on the side wall, since the inclination is usually relatively large, it is difficult for water pools that cause condensing to occur. Further, on the side walls between buildings such as a multi-storied house, a rain gutter is usually installed in the valley of the ceiling of the multi-storied house, and sunlight is blocked by this gutter. In this way, when the watering tube is installed on the side wall of the house, it is difficult to condense the sunlight on the watering tube, including the case where it is installed at a high place close to the ceiling, so that almost no fusion occurs. It is considered a thing.

  Further, as described above, even when the watering tube is installed on the side portion of the house so that the two fin portions are along the horizontal direction, the water passing portion hardly melts or is fused. The reason for this is considered to be that in this case as well, as in the case where the watering tube is installed so that the two fin portions are along the vertical direction, the sunlight is blocked and it is difficult to concentrate sunlight on the watering tube. It is done.

  In other words, when a watering tube is installed on the side of the house, the water passing part can be melted or melted regardless of whether the two fins are installed along the vertical direction or along the horizontal direction. There is almost no problem of wearing. Therefore, problems such as melting and fusing of the water flow part are considered to be peculiar to the case of installing on the ceiling of the house, and in this respect, the aspect of installing the water spray tube on the ceiling is the side part of the water spray tube. It is different from the case where it is installed.

In the watering tube 10 of the present embodiment,
The agricultural house 1 includes an inner sheet member 5 that covers the inner space of the agricultural house 1, and an outer sheet member that covers the inner sheet member 5 with an interval from the inner sheet member 5 from the outside. 7 and
The upper part of the inner sheet member 5 and the upper part of the outer sheet member 7 form the ceiling 3,
It is preferably supported between the outer sheet member 7 and the inner sheet member 5.

According to such a configuration, the water spray tube 10 is supported in the space between the outer sheet member 7 and the inner sheet member 5 so that the water spray tube 10 is placed in the space between the sheet members 5 and 7. Can be passed through.
Thereby, the temperature of this internal space can be adjusted, without sprinkling water directly in the space for growing the agricultural product inside the agricultural house 1.
For example, water having a temperature higher than that of the external environment such as ground water can be sprayed between the sheet members 5 and 7 at night in winter, thereby increasing the temperature of the internal space of the agricultural house 1. Can be kept warm.
And in the case of having such inner and outer sheet members 5, 7, it is possible to suppress a decrease in the heat retention effect in a state where water is passed, and the rupture of the water passage portion 11 in a state where water is not passed, And since it can suppress a fusion | melting and heat sealing | fusion, the watering tube 10 becomes a more useful thing.
Here, as described above, in the case where the inner and outer sheet members 5 and 7 are provided, if the water spray hole 13 is formed above the center O of the water flow portion 11, The water ejected from 13 collides with the outer sheet member 7, and in the winter season, the water that collided with the outer sheet member 7 may grow into a icicle. In this case, when the icicle falls due to sunlight irradiation in the daytime, the dropped tsura breaks through the inner sheet member 5, and as a result, there is a risk of reducing the heat retaining effect of the internal space of the agricultural house 1.
However, in such a case, since the water spray hole 13 is formed below the center of the water flow portion 11, the water ejected from the water spray hole 13 can fly toward the outer sheet member 7. Can be suppressed. Therefore, the fall of the above heat retention effects can be suppressed.

In the watering tube 10 of the present embodiment,
The plurality of water sprays so that the inner peripheral surface 15 of the plurality of water spray holes 13 tapers from the outside toward the inside of the water flow part 11 in a state where water is passed through the water flow part 11. It is preferable that the hole 13 is formed.

Here, if foreign matter is mixed in the water supplied to the inside of the water flow section 11, the foreign matter may enter the sprinkling hole 13 and the sprinkling hole 13 may be clogged.
However, according to the above configuration, the plurality of water spray holes 13 are formed so that the inner peripheral surface 15 is tapered toward the inner side from the outside to thereby prevent foreign matter from entering the water sprinkling hole 13. It is possible to suppress water spray holes that taper toward the outside from the inside or water spray holes in which the diameter of the inner peripheral surface is constant from the inside to the outside.
In particular, when the inner and outer sheet members 5, 7 are provided and the water flow part 11 is installed between the two sheet members 5, 7, a foreign object enters the water hole 13 and the water hole 13. Replacing the sprinkling tube 10 is very laborious when is closed. However, since the intrusion of foreign matters is suppressed as described above, such labor for replacement is reduced.

  As described above, according to the present embodiment, it is possible to suppress a decrease in the heat retaining effect in a state where water is passed, and to rupture, melt, and heat bond the water passage portion 11 in a state where water is not passed. A watering tube 10 that can be suppressed is provided.

  Although the watering tube of this embodiment is as above-mentioned, this invention is not limited to the said embodiment, A design change is possible suitably within the range which this invention intends.

For example, in the said embodiment, the agricultural house provided with the inner side sheet member and the outer side sheet member was shown as an agricultural house. However, in addition to, for example, an agricultural house that is not provided with an inner sheet member and has only an outer sheet member, an outer sheet member, and an inner sheet member and an outer sheet member. Also, an agricultural house provided with a further outer sheet member, an agricultural house provided with a further inner sheet member inside the inner sheet member, and the like can be employed.
For example, in the said embodiment, the aspect formed so that it might taper as an inner peripheral surface goes inside from the outer side as a watering hole was shown. However, in addition, for example, a watering hole formed so that the inner peripheral surface tapers as it goes from the inside to the outside, a watering hole formed so that the diameter of the inner peripheral surface is constant from the outside to the inside, etc. Can be adopted.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these.

  The watering tube was manufactured as follows, and the evaluation test was performed using the obtained watering tube.

(Example 1) Raw material for production and use of watering tube A raw material is a mixture of low density polyethylene having a density of 0.925 and MFR 0.8 g / 10 min mixed with 3% by mass of carbon black based on the total mass. Used as.

-Manufacture of raw sheet Using a T-die extruder, the above mixture is put into a T-die extruder, processed into a sheet having a thickness of 550 µm, and the obtained sheet is cut to have a predetermined width. A sheet piece was formed to obtain an original sheet for tube formation.

The obtained two sheet pieces were perforated by irradiating YAG laser from one surface (A surface) side to the other surface (B surface) side of each sheet piece. By this drilling, the water spray hole becomes a vertical water spray hole as shown in FIG. 3 such that the inner peripheral surface tapers from the one surface (A surface) side to the other surface (B surface) side. Formed. That is, vertical watering holes as shown in FIG. 3 were formed.
At this time, as shown in FIG. 3, the watering tube is arranged so that the two fin portions are positioned in the vertical direction, and the water is passed through the water passing portion 11 and is perpendicular to the longitudinal direction of the water passing portion 11. In the cross section, the angle θ with respect to the virtual straight line extending downward from the center of the water flow portion 11 is ± 15 °, ± 40 °, ± 70 °, respectively, at predetermined positions of the two sheets, Vertical watering holes were drilled at intervals of 300 mm in the longitudinal direction of the water flow section.

  Two sheet pieces each having such sprinkling holes are formed, the one surface (A surface) side (side opposite to the tapered tip) of each sheet piece is outside, and the other surface (B surface) side (tapered tip). The water spray tube of Example 1 was manufactured by heat-sealing both ends so that the distance between the seals at both ends in the width direction was 53.4 mm. The fin part was formed in the width direction both ends by heat sealing. The seal width (fin portion width) of the heat seal at this time was 4.5 mm. The inner diameter (diameter) of the watering tube manufactured in this way was 34 mmφ when water was poured into the water flow portion. Moreover, the water sprinkling hole was formed so that the inner peripheral surface of each water sprinkling hole may taper so that it may go inward from the outer side of a water flow part in the state currently watered inside the water flow part.

  Each vertical water spray hole formed had a hole diameter of the inner opening of the water flow portion of 0.40 mm and a hole diameter of the outer opening of 0.65 mm.

(Comparative example 1) Manufacture of water sprinkling tube The inner peripheral surface tapers from the one surface (A surface) side to the other surface (B) side of the two unperforated sheet pieces obtained in Example 1. And so as to be vertical watering holes.
At this time, the water spray tube is arranged so that the two fin portions are positioned in the horizontal direction, and in a state where water is passed through the water passage portion, in the cross section perpendicular to the longitudinal direction of the water passage portion, from the center of the water passage portion. Vertical watering at intervals of 300 mm in the longitudinal direction of the water passing portion at predetermined positions of the two sheets at angles of ± 15 °, ± 40 °, ± 70 ° with respect to a virtual straight line extending downward in the vertical direction A hole was drilled.

  Two sheet pieces each having such sprinkling holes are formed, the one surface (A surface) side (side opposite to the tapered tip) of each sheet piece is outside, and the other surface (B surface) side (tapered tip). The water spray tube of Comparative Example 1 was manufactured by heat-sealing both ends so that the distance between the seals at both ends in the width direction was 53.4 mm. The fin part was formed in the width direction both ends by heat sealing. The seal width (fin portion width) of the heat seal at this time was 4.5 mm. The inner diameter (diameter) of the watering tube manufactured in this way was 34 mmφ when water was poured into the water flow portion.

Each vertical water spray hole formed had a hole diameter of the inner opening of the water flow portion of 0.40 mm and a hole diameter of the outer opening of 0.65 mm.
That is, the watering of Comparative Example 1 is different from Example 1 in that the two fin portions are arranged horizontally with the watering tube installed, but the position of the watering hole is the same as that of Example 1. A tube was manufactured.

(Example 2) Manufacture of watering tube The sheet piece obtained in Example 1 with the vertical watering holes formed on the one surface (A surface) side (the side opposite to the tapered tip) of each sheet piece. A watering tube of Example 2 was manufactured in the same manner as Example 1 except that the inner surface and the other surface (B surface) side (tapered tip side) were overlapped so as to be located outside.
Each vertical watering hole formed had a hole diameter of the inner opening of the water passage portion of 0.65 mm and a hole diameter of the outer opening of 0.40 mm.
Moreover, the water sprinkling hole was formed so that the inner peripheral surface of each water sprinkling hole may taper away from the inner side to the outer side of the water passing part in a state where water is passed through the water passing part.

(Installation of watering tube)

  Suspension jigs provided at intervals of 1 m in the longitudinal direction are attached to pipes arranged inside the top of an agricultural house having a length of 50 m (the top of the outer sheet member, height of 300 cm from the ground). The two fin portions are along the vertical direction at a position about 30 cm below the top of the outer sheet member (the imaginary straight line connecting the two fin portions is parallel to the vertical direction), and the water passage portion The watering tube of Example 1 and Example 2 was installed so that a watering hole may be located below the center. Thereafter, an inner sheet member (lining sheet member) was installed below the watering tube so that the height of the top of the sheet member was 200 cm from the ground.

  On the other hand, except that the two fin portions are along the horizontal direction (the straight line connecting the two fin portions is parallel to the horizontal direction) and the water spray holes are positioned above the center of the water flow portion. The watering tube of the comparative example 1 was installed similarly to the watering tube of 1 and Example 2, and the inner sheet | seat member was installed under the watering tube.

The state of each watering tube installed is shown in Table 1.
In Table 1, when the two fin portions are installed along the vertical direction, the installation direction is indicated as “vertical”, and when the two fin portions are installed along the horizontal direction, the installation direction is Shown as “Landscape”.
Furthermore, for the two sheet pieces used in the manufacture of each watering tube, as a combination of the outer surfaces of the two overlapped sheet pieces, the A surface side (the side opposite to the tapered tip) is located on the outside. , “A / A”, and the case where the B surface side (tapered tip side) is located outside is indicated as “B / B”.

(Test example)
Sprinkling water at night (from 16:00 to 7:00 the next morning) for 1 month from February to March using each watering tube installed in the agricultural house as described above, and watering in the other daytime Repeated to stop.
And after completion | finish of this test, it was investigated during this period whether the water sprinkling hole was clogged, whether heat fusion had occurred, or whether the water passage portion had ruptured. The results are shown in Table 1.
In addition, the temperature in the agricultural house was examined by installing a temperature recorder at a height of about 1 m near the center of the agricultural house.
FIG. 7 shows the temperature transition of the agricultural house in which each watering tube is installed from February 25 to February 26, the final stage of the test when the outside air temperature is the lowest.

  In Examples 1 and 2 in which the watering tube was placed vertically, heat fusion was suppressed as compared with Comparative Example 1 in which the watering tube was placed horizontally. Moreover, since there was little clogging, it turned out that it is excellent in heat retention at night. Furthermore, the water spray tube of Example 1 which is expanded so that a water spray hole goes to the outer side from the inner side of a water flow part (it taper so that it goes to the inner side from the outer side) is so narrow that a water spray hole goes to the outer side from the inner side of a water flow part. Compared to the watering tube of Example 2 that is tapered (tapered from the inside to the outside), it was found that the heat retention at night was excellent because there was less clogging.

  1: agricultural house, 3: ceiling, 5: inner sheet member, 5a: upper part (ceiling of inner sheet member), 7: outer sheet member, 7a: upper part (ceiling of outer sheet member), 9: Suspension jig, 10: sprinkling tube, 11: water passage, 13: sprinkling hole, 13a: vertical sprinkling hole, 15, 15a: inner peripheral surface, 17: raw fabric sheet, 21: fin portion

Claims (3)

A watering tube supported on the ceiling of an agricultural house,
A water flow part formed into a ring shape by passing water through the inside, and formed with a plurality of sprinkling holes for ejecting the internal water to the outside;
Two fin portions projecting in opposite directions from the water flow portion,
In the state supported by the ceiling, the two fin portions are arranged along the vertical direction,
In a state of being supported by the ceiling and being passed through the interior of the water passage, water is sprayed toward the lower side of the horizontal direction, below the center of the water passage, A watering tube in which the plurality of watering holes are formed. The agricultural house has an inner sheet member that covers the inner space of the agricultural house, and an outer sheet member that covers the inner sheet member with an interval from the inner sheet member from the outside. And
The upper part of the inner sheet member and the upper part of the outer sheet member form the ceiling,
The watering tube according to claim 1, which is supported between the outer sheet member and the inner sheet member.   The plurality of water spray holes are formed so that the inner peripheral surfaces of the plurality of water spray holes are tapered toward the inside from the outside of the water flow section in a state where water is passed through the water flow section. The watering tube according to claim 1 or 2.