JP2019041698A - Water spray tube and production method thereof - Google Patents

Abstract

To provide a water spray tube or the like capable of increasing a water spray distance and a water spray range, and suppressing water dropping from a water spray hole during water conduction to a water conduction part and after stop of water conduction to the water conduction part.SOLUTION: There is provided a water spray tube 10 configured so that water is passed to the inside and comprising a water conduction part 11 formed with a plurality of water spray holes 13 for jetting the water in the water spray tube to an external part, and the plurality of water spray holes are formed such that inner peripheral faces of the plurality of water spray holes become tapered as going to an external part from the inside of the water conduction part in a state in which water is passed to the inside of the water conduction part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a watering tube and a method for manufacturing the same.

  Conventionally, in agricultural facility horticulture, vegetables and the like are cultivated using an agricultural house such as a so-called plastic house. For such vegetable cultivation, watering work is required, and in such watering work, water is sprayed on the soil using a watering tube in which a plurality of watering holes are formed in the tube.

  As this kind of sprinkling tube, a sprinkling tube is proposed which is formed to be cylindrical by passing water (supplying water) to the inside, and having a water passing portion in which water sprinkling holes are formed. (See Patent Documents 1 and 2). In such a water spray tube, water spray holes are formed in the water flow portion so as to taper from the outside toward the inside.

JP 2000-176319 A JP 2004-147564 A

  However, the watering distance and the watering range are narrow in the watering tubes of the cited documents 1 and 2. In addition, after stopping water sprinkling from the water sprinkling hole and water sprinkling from the water sprinkling hole, droplets become larger than when water is sprinkled from the water sprinkling hole. There is a risk of falling. Such dripping leads to generation of harmful effects such as uneven growth of plants and moisture damage.

  In view of the above circumstances, the present invention can increase the watering distance and watering range, and after stopping the water flow to the water passing part or the water passing part, An object of the present invention is to provide a sprinkling tube that can prevent the water from dropping and a method for manufacturing the same.

The watering tube according to the present invention is:
The water spray holes are formed so that the inner peripheral surfaces of the water spray holes taper from the inner side to the outer side of the water flow part in a state where water is passed through the water flow part. ing.

According to such a configuration, the inner peripheral surface of the water spray hole is directed from the inner side to the outer side of the water passage portion in a state where water is passed through the water passage portion (from the upstream side to the downstream side in the water passage direction). A plurality of sprinkling holes are formed so as to be tapered.
By being formed in this way, it is possible to prevent water from dripping out of the water sprinkling holes after stopping the water flow to the water flow part and the water flow. Moreover, the watering distance and watering range from each watering hole can be increased.
The reason why the dropout is suppressed is not clear, but in running water, the inner peripheral surface of the water spray hole is directed from the outside to the inside of the water passing portion (the direction from the downstream side to the upstream side in the water passage direction). Compared with the case where the water spray holes are formed to be tapered, the flow rate of water passing through the water spray holes becomes faster, and as a result, the amount of water stagnating in the vicinity of the water spray holes is reduced. As a result, it is speculated that the falling of water from the sprinkling holes can be suppressed, and the sprinkling distance and sprinkling range from each sprinkling hole can be increased.
After the water flow is stopped, when the water passes through the water spray hole, compared to the case where the water spray hole is formed so that the inner peripheral surface of the water spray hole is tapered toward the inside from the outside of the water flow part. Since the resistance that water receives from the sprinkling holes increases, it becomes difficult for water to pass through the sprinkling holes. As a result, it is surmised that water drops from the water spray holes are suppressed.

In the watering tube having the above configuration,
Two or more sprinkling holes of the plurality of sprinkling holes are formed so as to be inclined with respect to the thickness direction of the water passing portion so that water ejected from the two or more sprinkling holes collides with each other. It may be.

According to such a configuration, two or more of the plurality of water spray holes are inclined with respect to the thickness direction of the water flow portion so that water ejected from the two or more water spray holes collides. It is possible to eject fine droplets of water farther than when water is ejected from a (single) sprinkling hole not formed to collide in this way. Become. Furthermore, as the pressure in the water passage increases, the flow velocity of water ejected from the sprinkling holes increases and the collision energy increases. As the pressure is increased, the flow rate of the water ejected from the sprinkling holes is increased, so that finer droplets of water can be ejected.
Here, conventionally, there is a case where it is desired to cool a place having a high environmental temperature such as in a house in summer, but the cooling capacity is not sufficient.
However, when compared with the same sprinkling amount, as described above, it becomes possible to eject finer droplets of water, thereby increasing the total surface area of the droplets and increasing the heat from the droplets into the environment. Mass transfer (evaporation) is promoted, and the heat of vaporization taken from the surroundings during the evaporation increases, so that the cooling effect is enhanced.
Further, when the droplets evaporate, the humidity in the house increases, so that the humidification effect is enhanced in addition to the cooling effect.
In this way, in addition to being able to eject finer droplets of water farther, it is also possible to enhance the cooling effect and the humidifying effect.
Furthermore, when compared with the same watering amount, by ejecting finer droplets of water, the number of droplets increases, and the droplets can be dispersed over a wider range. As a result, the liquid droplets drift in the air farther, and as a result, the plants grow more. Watering) can also be performed.

In the watering tube having the above configuration,
The thickness of the water flow portion is D (mm),
When the distance between the intersection of two or more virtual straight lines passing through the centers of the two or more water spray holes that collide with each other on the side where the water flies and the inner surface of the water flow portion is H (mm) ,
Said D and H are the formula 0.5xD <H <D + 50
May be satisfied.

  According to such a configuration, when the above formula is satisfied, the position where the water ejected from the two or more sprinkling holes collides is not too far from the surface of the water passing portion and is not too close. In addition, it becomes possible to eject water of finer droplets farther and more efficiently.

A method of manufacturing a watering tube according to the present invention is as follows.
A method of manufacturing the watering tube,
Using two sheets,
A plurality of sprinkling holes are formed in at least one of the two sheets by punching from one side to the other side so that the opening on the one side is larger than the opening on the other side. Process,
And heat sealing both ends by superimposing the two sheets so that the opening on the one surface side is located inside.

  According to such a configuration, it is possible to easily manufacture the water spray holes that taper toward the outside from the inner side of the water flow portion.

In the method of manufacturing the watering tube having the above configuration,
The perforation may be performed by irradiating a laser beam.

  According to this configuration, it is possible to more easily manufacture the water spray holes that taper toward the outside from the inner side of the water flow portion.

  As described above, according to the present invention, it is possible to increase the sprinkling distance and the sprinkling range, and after stopping the water flow to the water flow portion and the water flow portion, from the water hole. A watering tube capable of suppressing water from dropping and a method for manufacturing the same are 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 vertical watering hole of this embodiment. Schematic diagram showing an enlarged view of the periphery of the vertical watering hole in FIG. Schematic diagram schematically showing a state in which water is ejected from the vertical sprinkling holes of FIG. Schematic which shows the vertical cross section of the watering tube which has the non-vertical watering hole of this embodiment. Schematic diagram showing an enlarged view of the periphery of the non-vertical water spray hole in FIG. Schematic diagram schematically showing a state in which water is ejected from the non-vertical sprinkling holes in FIG. The schematic which expands and shows this X hole periphery of the watering tube which has one X hole of this embodiment Schematic schematically showing a state in which water is ejected from the X hole of FIG. The schematic which expands and shows this X hole periphery of the watering tube which has another X hole of this embodiment Schematic which shows typically the state from which water is ejected from X 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 Schematic side view showing a state where water is sprayed by the watering tube of the present embodiment Schematic which expands and shows the periphery of the watering hole of the watering tube of Production Example 2 Schematic which expands and shows the periphery of the watering hole of the watering tube of Production Example 4 The graph which shows the relationship between the watering distance and watering particle size of Production Examples 1 and 2 The graph which shows the relationship between the watering distance and watering particle diameter of manufacture example 3 and 4 Schematic which expands and shows the periphery of the watering hole of the watering tube of manufacture example 6 Schematic which expands and shows the periphery of the watering hole of the watering tube of the manufacture example 8. Graph showing the relationship between the watering distance and watering intensity of Production Examples 5 and 6 The graph which shows the relationship between the watering distance and watering intensity of the manufacture examples 7 and 8

  Hereinafter, the watering tube and its manufacturing method of one embodiment of the present invention are explained, referring to drawings.

As shown in FIG. 1, the watering tube 10 of this embodiment is installed in the agricultural house 1, for example. In addition, although the watering tube 10 can be used in an outdoor open-air field, an indoor livestock barn, etc. according to the objective, it is preferable to use it for the agricultural house 1 especially.
Examples of the watering tube 10 include a tube for irrigation, cooling, humidification, and foliar watering.
The height of the water spray tube 10 is not particularly limited, and can be set as appropriate depending on the shape and size of the agricultural house 1.
In the agricultural house, the watering tube 10 may be installed in the ridge 3 instead of the wall portion 5a and the column 7. For example, it may be installed on the wall 5a side of the ridge 3 (for example, near the wall 5a) or on the column 7 side of the ridge 3 (for example, near the column 7).
Moreover, the watering tube 10 may be installed on the ground.

  As shown in FIGS. 2 to 10, 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 that eject the internal water to the outside. In the state where the plurality of water sprinkling holes 13 are passed through the water passing portion 11, the inner peripheral surface 15 of the water sprinkling hole 13 is from the inner side (back side) of the water passing portion 11. It is formed so as to taper toward the outside (front side).

The water passing part 11 is a part through which water is passed and water is ejected from a plurality of water spray holes.
Water is supplied (passed through) from a water supply device (not shown) into the water passage 11. When water is not passed, the water spray tube 10 is in a state as shown in FIGS.
In this embodiment, the water flow part 11 is formed so that it may be cylindrical when 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 part 11 exceeds 5.0 mm, the rigidity and weight of the water flow part 11 will increase excessively, and winding of the water flow part 11 and water sprinkling holes will be formed in the water flow part 11. There is a risk that it may be difficult to perforate. 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 5 to 150 mm, and still more preferably 5 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 can be formed in a desired pattern in the circumferential direction and the longitudinal direction of the water flow portion 11.

  As shown in FIGS. 3 to 8, the inner peripheral surface 15 of the sprinkling hole 13 extends from the inner side to the outer side of the water passing part 11 in the water passing part 11 in a state where water is passed through the water passing part 11. A plurality of sprinkling holes 13 are formed so as to taper as they go (as they go from the upstream side to the downstream side in the water passage direction).

  As the water sprinkling hole 13, as shown in FIGS. 3 to 5, a vertical water sprinkling hole 13 a extending in a direction perpendicular to the tangent line in contact with the water passing portion 11 in the water sprinkling hole 13 (thickness direction of the water passing portion 11), As shown in FIGS. 6-10, the non-vertical watering hole 13b extended in the direction inclined with respect to the said perpendicular | vertical direction (thickness direction) may be sufficient.

  The vertical sprinkling holes 13a and the non-vertical sprinkling holes 13b fly at an equal distance from the vertical sprinkling holes 13a when sprinkling from each hole under the same sprinkling conditions with respect to the hole area, drilling position, water pressure, etc. In this case, the water droplets have a small particle size.

  Here, in sprinkling from the vertical sprinkling hole 13a, there is little collision with the hole wall surface when passing through the vertical sprinkling hole 13a, so the water that has passed through the vertical sprinkling hole 13a forms a water column and flies for a while in the air. After that, in the sprinkling from the non-vertical sprinkling holes 13b, the water that has passed through the non-vertical sprinkling holes 13b forms a water column to fly in the air. It tends to break up into water droplets earlier (after a short flight) or almost no water column is formed.

  The mechanism of the difference in the water ejection behavior from each of the vertical water spray holes 13a and the non-vertical water spray holes 13b is not clear, but the water flow generated when the water spray holes pass due to the difference in the hole shapes. This is probably due to the difference in state. When water is poured into the water flow portion 11 of the water spray tube 10, water pressure acts perpendicularly to the inner wall surface of the water flow portion 11 (longitudinal direction of the water spray tube 10). Since the center line of the vertical water sprinkling hole 13a is almost parallel to the direction, water flows into the vertical water sprinkling hole 13a from the main flow path (inside the water flow portion 11) of the water sprinkling tube 10, and then the action direction of water pressure Since water flows in the same direction, it is thought that the water flow will jump out into the air without being disturbed.

  On the other hand, in the non-vertical sprinkling hole 13b, the center line of the hole is inclined with respect to the action direction of the water pressure due to the hole shape or the like. The collision causes a forced change in the flow of water passing through the hole, thereby causing turbulence and turbulence in the flow velocity distribution, and the water passing through the non-vertical water spray holes 13b cannot form a water column. Or even if a water column is formed, it is thought that division will start early. In addition, when the two non-vertical watering holes 13b are adjacent to each other and are arranged so that the center lines of the holes intersect each other (the X hole described later), the flow of water that has passed through one of the holes The water flow that has passed through the other hole collides, and water droplets break up from the vicinity where the collision occurred, so that fine water droplets with a smaller particle diameter are formed than when no collision occurs in this way. Will be.

On the other hand, when a water droplet is formed from the water that has passed through the vertical water sprinkling hole 13a and the non-vertical water sprinkling hole 13b, the flight of the water droplet is subjected to air resistance, so its terminal speed (speed when reaching the ground) is Is generally known to follow the Stokes equation, which is proportional to the square of the particle diameter.
Here, as described above, since the water droplet generated from the non-vertical water spray hole 13b has a particle diameter smaller than that of the water droplet generated from the vertical water spray hole 13a, the terminal velocity is reduced and the flight distance is shortened. As described above, the shape of the water spray hole and the flight distance of the water droplet (that is, the water spray distance) are closely related, and the non-vertical water spray hole 13b in which the particle diameter of the water droplet is small is short because the flight distance is short. The vertical sprinkling holes 13a that are suitable for watering the region and have a large water droplet particle size are suitable for long-distance watering since the flight distance is long.
Moreover, the flight direction of the water which jumps out of these sprinkling holes and the time of flight (flight) are determined by the arrangement of the vertical sprinkling holes 13a and the non-vertical sprinkling holes 13b formed in the water flow section 11, and water droplets when landing on the ground Influences the particle size and flight speed, and as a result, the watering distance and the area of the watering area are significantly affected. Therefore, in consideration of these, the arrangement of the vertical watering holes 13a and the non-vertical watering holes 13b in the water flow section 11 can be set as appropriate.

The vertical watering hole 13a will be described.
As shown in FIGS. 4 and 5, the vertical water sprinkling hole 13 a has a thickness direction of the water passing portion 11 and a virtual center line of the vertical water sprinkling hole 13 a (the center of the outer opening and the center of the inner opening of the vertical water sprinkling hole 13 a). (Virtual straight line that passes through). The thickness direction of the water flow part 11 is the inner surface of the water flow part 11 (a virtual plane (not shown) in contact with the water flow part 11 at the center of the inner opening) when the water flow part 11 is folded into a flat state. Corresponds to the vertical direction. As shown in FIG. 3, the virtual center line of the vertical water sprinkling hole 13 a passes through the center of the outer opening of the vertical water sprinkling hole 13 a in a state where water flows through the water sprinkling part 11 and It coincides with a virtual straight line (not shown) passing through the center O.
As shown in FIG. 5, water is ejected from the vertical water spray hole 13a in a conical shape centered on the virtual center line.

The non-vertical watering hole 13b will be described.
The non-vertical sprinkling holes 13b are intended for all sprinkling holes having a shape deviating from the definition of the vertical sprinkling holes 13a. Furthermore, all the water spray holes having a structure in which the behavior of the water ejected from the holes is different from that of the vertical water spray holes 13a. Specifically, as shown in FIGS. 7 and 8, the non-vertical water spray hole 13 b is a virtual center line of the non-vertical water spray hole 13 b (inside the non-vertical water spray hole 13 b) with respect to the thickness direction of the water flow portion 11. An imaginary straight line passing through the center of the opening and the center of the outer opening) is inclined. The thickness direction of the water flow part 11 is the inner surface of the water flow part 11 (a virtual plane (not shown) in contact with the water flow part 11 at the center of the inner opening) when the water flow part 11 is folded into a flat state. Corresponds to the vertical direction. As shown in FIG. 6, the virtual center line of the non-vertical water sprinkling hole 13 b passes through the center of the outer opening of the non-vertical sprinkling hole 13 b and is vertical to the water flow section 11 in a state where water flows through the water flow section 11. It is inclined with respect to a virtual straight line (not shown) passing through the center O of the cross section.
Examples of the non-vertical watering hole 13b include an X hole, an elliptical hole, and a slit hole having a remarkably large length / width ratio. Among them, the X hole described later is preferable because it can be easily drilled with a laser.

When ejected with the same hole cross-sectional area and the same water pressure, the water ejected from the non-vertical sprinkling hole 13b has a shorter flight distance than the water spouted from the vertical sprinkling hole 13a and ejected from the vertical sprinkling hole 13a. A flight pattern (see FIG. 15) that is wider than the drawn water may be shown.
Further, the water ejected from the non-vertical sprinkling holes 13b is dispersed after the water column is ejected from the non-vertical sprinkling holes 13b as compared with the case where the water is ejected from the vertical sprinkling holes 13a with the same cross-sectional area and the same water pressure. The time until the start is short and split atomization starts early, and it is easy to receive deceleration due to air resistance, so it is not possible to fly over a long distance. As a result, the point at which dispersion, atomization, and deceleration start can be made close to the water spray tube 10, so that the water can be sprayed nearby, and the spread of water droplets after splitting can be ensured while watering nearby. And soil damage can be avoided.
As shown in FIG. 8, water is ejected from the non-vertical water spray hole 13b in a conical shape centered on the virtual straight line.

In the present embodiment, the hole diameter (diameter) of the outer opening of the water sprinkling hole 13 (vertical sprinkling hole 13a and non-vertical sprinkling hole 13b) in the planar state is that of the inner peripheral surface 15 from the outer side to the inner side of the water flow portion 11. Of these, the hole diameter is the narrowest part. The hole diameter of the outer 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 outer opening of the sprinkling hole 13 exceeds 2.0 mm, the flow rate of the water flowing into the sprinkling hole 13 increases, and thus there is a possibility that the longness of the water passage portion 11 is deteriorated.
If the hole diameter of the outer opening of the sprinkling hole 13 is less than 0.05 mm, foreign matter such as sand may enter the sprinkling hole 13 to cause clogging.
On the other hand, when the hole diameter of the outer opening of the sprinkling hole 13 is 0.05 to 2.0 mm, the above-described problem is suppressed.

The diameter (diameter) of the inner opening of the water sprinkling hole 13 (vertical sprinkling hole 13a and non-vertical sprinkling hole 13b) in the planar state is the widest portion of the inner peripheral surface 15 from the outside to the inside of the water flow portion 11. The hole diameter. The hole diameter of the inner 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 inner 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 inner opening of the sprinkling hole 13 is less than 0.06 mm, there is a possibility that a foreign matter such as sand enters the sprinkling hole 13 to cause clogging.
On the other hand, when the inner hole diameter of the sprinkling hole 13 is 0.06 to 5.0 mm, the above-described 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 ratio of the hole diameter (diameter) of the outer opening and the hole diameter (diameter) of the inner opening in the watering hole 13 (vertical watering hole 13a and non-vertical watering hole 13b) in the planar state is not particularly limited. The hole diameter is preferably adjusted within a range of 1: 1.1 to 1:20 (hole diameter of the outer opening: hole diameter of the inner opening = 1: 1.1 to 1:20).

  In the present embodiment, the thickness direction of the water flow portion 11 is such that two or more water holes 13 out of the plurality of water holes 13 collide with water ejected from the two or more water holes 13. It may be inclined with respect to.

9 and 10 employ a non-vertical sprinkling hole 13b as the plurality of sprinkling holes 13, and two non-vertical sprinkling holes among the plurality of non-vertical sprinkling holes 13b. An example is shown in which a plurality of non-vertical water spray holes 13b are formed to be inclined with respect to the thickness direction of the water flow portion 11 so that water ejected from 13b collides.
Specifically, two non-vertical sprinkling holes 13b are adjacent to each other, and a virtual center line (virtual straight line) L passing through the center S1 of the outer opening and the center S2 of the inner opening of each non-vertical sprinkling hole 13b is a water flow portion. 11 are arranged so as to cross each other on the outer side of 11 (that is, the side on which water flies by water pressure). As shown in FIG. 10, the plurality of non-vertical water spray holes 13b are referred to as X holes because the water ejected from them becomes X-shaped.
The X hole refers to the entire set of two or more water spray holes formed so that the virtual center line L intersects on the side where water is caused to fly by water pressure. In the examples of FIGS. Refers to the entire set of two sprinkling holes.

  The X hole is formed so that the water that has passed through the non-vertical water sprinkling hole 13b on the outside of the water flow portion 11 collides with the X hole by the non-vertical sprinkling holes 13b separated (independent) from each other. In addition to the holes, as shown in FIGS. 11 and 12, a plurality of non-vertical water spray holes 13 b are integrated on the outside (that is, the side on which water flies due to water pressure) in the water flow part 11. The X hole formed so that the water which passed the non-vertical watering hole 13b inside the part 11 collides is also included.

In FIG. 11 and FIG. 12, two non-vertical water sprinkling holes 13 b out of the plurality of non-vertical sprinkling holes 13 b are integrally connected on the outside in the water flow section 11. An example is shown in which a plurality of non-vertical water spray holes 13b are formed to be inclined with respect to the thickness direction of the water flow portion 11 so that water that has passed through the vertical water spray holes 13b collides.
Specifically, two non-vertical sprinkling holes 13b are adjacent to each other, and a virtual center line (virtual straight line) L passing through the center S1 of the outer opening and the center S2 of the inner opening of each non-vertical sprinkling hole 13b is a water flow portion. 11 are arranged so as to cross each other on the outside (that is, the side on which water flies by water pressure). That is, each non-vertical sprinkling hole 13b appears to be present as two holes on the inner surface when viewed from the inside of the water flow portion 11, while when viewed from the outside of the water flow portion 11, its outer surface. Appear to exist as one hole. 11 and 12, the center S1 of the outer opening of each non-vertical sprinkling hole 13b is the same as that of each non-vertical sprinkling hole 13b when it is assumed that the respective non-vertical sprinkling holes 13b are formed separately from each other. The center of the outer opening.

  9 to 12 show a mode in which the plurality of water sprinkling holes 13 have two sprinkling holes 13 that collide with each other. In the present embodiment, the plurality of water sprinkling holes 13 have three or more watering holes that collide with each other. An aspect having 13 may be adopted.

In such an X hole, when the water passage 11 is folded into a flat state,
The thickness of the water flow part 11 is D (mm),
The distance from the water passing portion 11 at the intersection R where two or more virtual straight lines (two second virtual straight lines L) passing through the centers of two or more adjacent non-vertical water spray holes 13b intersect (the water passing portion 11 When the height from the inner surface is H (mm),
D and H have the formula 0.5 × D <H <D + 50
Is preferably satisfied.
Also, the above D and H are
It is more preferable that 0.6 × D <H <D + 30 is satisfied,
More preferably, 0.7 × D <H <D + 10 is satisfied.

In addition to the above, such an X hole may be formed by a combination of the vertical watering hole 13a and the non-vertical watering hole 13b.
Moreover, the hole diameter of each water sprinkling hole 13 which forms X hole can be evaluated for every water sprinkling hole 13, and can be set similarly to the hole diameter of the vertical water sprinkling hole 13a mentioned above or the non-vertical water sprinkling hole 13b.

The water spray tube 10 includes a fin portion 21 that protrudes 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. Here, two fin portions 21 are provided, and these fin portions 21 protrude from both end portions of the water flow portion 11 that are farthest from each other.
One fin portion 21 may be provided.

  By providing this fin part 21, since the water flow part 11 becomes difficult to bend in a longitudinal direction, it becomes possible to spray water more appropriately by the water spray tube 10.

  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 water spray tube 10 of this embodiment, the water flow part 11 is provided with a plurality of water spray holes 13, and one or more water spray holes 13 out of the plurality of water spray holes 13 have an inner peripheral surface 15. What is necessary is just to be formed so that it may taper off so that it goes to the outer side from the inner side of the water flow part 11, and the quantity of the water spraying holes 13 which have such an internal peripheral surface 15 is not specifically limited.

  In addition, among the plurality of water spray holes 13, two or more water spray holes 13 formed so that the inner peripheral surface is tapered from the inside toward the outside as described above are ejected from these two or more water spray holes. Even when formed water collides (when two or more sprinkling holes 13 constitute an X hole), the quantity of the two or more sprinkling holes 13 (two or more sprinklings) The number of the pair of holes 13 is not particularly limited.

  Moreover, even if the water sprinkling hole 13 formed so that the inner peripheral surface is tapered toward the outside from the inside as described above is only the vertical water sprinkling hole 13a, only the non-vertical water sprinkling hole 13b is provided. Or a combination thereof.

  Further, the plurality of water sprinkling holes 13 may include water sprinkling holes other than the water sprinkling holes 13 formed so as to taper as the inner peripheral surface 15 goes from the inside to the outside as described above.

The manufacturing method of the watering tube 10 is not specifically limited.
For example, as shown in FIGS.
Using two long raw fabric sheets (sheets) 17 formed from the resin as described above,
By piercing at least one of the two sheets 17 from the one surface side toward the other surface side, the plurality of water spray holes 13 are formed so that the opening on the one surface side is larger than the opening on the other surface side. Forming, and
By superimposing the two sheets 17 so that the opening on the one surface side is located inside, 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.

  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 where the watering tube 10 is installed, by supplying water to the watering tube 10 from a water supply unit (not shown), the vertical watering holes 13a and the non-vertical watering of the watering tube 10 are performed. Water is sprayed from the holes 13b.

  The water pressure (water supply pressure) in the water passage portion 11 in a state where water is passed through the water passage portion 11 of the water spray tube 10 is preferably 0.05 MPa to 1.0 MPa, and preferably 0.10 MPa to 0.60 MPa. More preferred.

As described above, the watering tube 10 of the present embodiment is
A water passage portion 11 is formed so that water is passed through the inside, and a plurality of water sprinkling holes 13 are formed for ejecting the water inside.
The plurality of water sprays so that the inner peripheral surface 15 of the plurality of water spray holes 13 tapers from the inner side to the outer side of the water flow part 11 in a state where water is passed through the water passage part 11. A hole 13 is formed.

As described above, the inner peripheral surface 15 of the water sprinkling hole 13 moves from the inner side to the outer side of the water passage portion 11 in a state where water is passed through the water passage portion 11 (from the upstream side to the downstream side in the water passage direction). Since the plurality of water spray holes 13 are formed so as to be tapered, the water drops from the water sprinkle hole 13 after the water flow to the water flow section 11 and after the water flow is stopped. This can be suppressed. Moreover, the watering distance and watering range from each watering hole 13 can be increased.
The reason why the dropout is suppressed is not clear, but in running water, the inner peripheral surface 15 of the water sprinkling hole 13 goes from the outside to the inside of the water passing portion 11 (from the downstream side to the upstream side in the water passage direction). Compared with the case where the sprinkling holes 13 are formed so as to be tapered, the flow rate of water passing through the sprinkling holes 13 becomes faster, and as a result, the amount of water stagnating in the vicinity of the sprinkling holes 13 is reduced. As a result, it is speculated that the falling of water from the sprinkling holes 13 can be suppressed and the sprinkling distance and sprinkling range from each sprinkling hole 13 can be increased.
After the water flow is stopped, the water spray hole 13 is more water-filled than the case where the water spray hole 13 is formed so that the inner peripheral surface 15 of the water spray hole 13 is tapered toward the inner side from the outer side of the water flow part 11. Since the resistance which water receives from the water sprinkling hole 13 when water passes, water becomes difficult to pass through the water sprinkling hole 13. As a result, it is surmised that the dripping of water from the sprinkling holes 13 is suppressed.

In the watering tube 10 of the present embodiment,
Two or more sprinkling holes 13 of the plurality of sprinkling holes 13 are inclined with respect to the thickness direction of the water flow portion 11 such that water ejected from the two or more sprinkling holes 13 collides with each other. May be formed.

Thus, with respect to the thickness direction of the water flow portion 11, two or more water holes 13 out of the plurality of water holes 13 collide with water ejected from the two or more water holes 13. By being formed in an inclined manner, water of fine droplets can be ejected farther than when water is ejected from the (single) sprinkling holes 13 that are not formed to collide in this way. Is possible. Further, as the pressure in the water passage 11 is increased, the flow velocity of water ejected from the water sprinkling hole 13 is increased and the collision energy is increased. Therefore, water is supplied from one sprinkling hole (single hole sprinkling hole) 13. It is possible to eject finer droplets of water than when ejecting.
Here, conventionally, there is a case where it is desired to cool a place having a high environmental temperature such as in a house in summer, but the cooling capacity is not sufficient.
However, when compared with the same sprinkling amount, as described above, it becomes possible to eject finer droplets of water, thereby increasing the total surface area of the droplets and increasing the heat from the droplets into the environment. Mass transfer (evaporation) is promoted, and the heat of vaporization taken from the surroundings during the evaporation increases, so that the cooling effect is enhanced.
Further, when the droplets evaporate, the humidity in the house increases, so that the humidification effect is enhanced in addition to the cooling effect.
In this way, in addition to being able to eject finer droplets of water farther, it is also possible to enhance the cooling effect and the humidifying effect.
Furthermore, when compared with the same watering amount, by ejecting finer droplets of water, the number of droplets increases, and the droplets can be dispersed over a wider range. As a result, the liquid droplets drift in the air farther, and as a result, the plants grow more. Watering) can also be performed.

In the watering tube 10 of the present embodiment,
The water flow part 11 may be formed of a resin material containing only low density polyethylene or a resin material containing low density polyethylene and high density polyethylene.
By being formed of such a resin material, the heat resistance of the water flow tube 10 can be improved to such an extent that it can withstand use in places with high environmental temperatures, such as in a summer house. Since the water of the finer droplets is ejected, the strength can be improved to such an extent that it can withstand even when a higher water supply pressure is applied.
Thus, the water spray tube 10 is excellent in heat resistance and strength.

In the watering tube 10 of the present embodiment,
The thickness of the water flow portion 11 is D (mm),
The intersection R where two or more virtual center lines (virtual straight lines) L passing through the centers of the two or more water spray holes 13 intersect on the outside of the water flow part 11 on the side where water flies, and the water flow part When the distance from the inner surface of 11 is H (mm),
Said D and H are the formula 0.5xD <H <D + 50
Is preferably satisfied.

  According to such a configuration, the position where the water ejected from the two or more sprinkling holes 13 collides is not too far from the surface of the water flow portion 11 and is not too close by satisfying the above relational expression. More appropriately and more efficiently, finer droplets of water can be ejected further.

The manufacturing method of the watering tube 10 of this embodiment is as follows.
A method for manufacturing the watering tube 10, comprising:
Using two sheets 17
A plurality of water spray holes 13 are formed in at least one of the two sheets 17 such that the opening on the one surface side is larger than the opening on the other surface side by punching from one surface side to the other surface side. Forming, and
A step of heat-sealing both ends by superimposing the two sheets 17 so that the opening on the one surface side is located inside.

  According to such a configuration, the water sprinkling holes 13 that taper toward the outer side from the inner side of the water flow portion 11 can be easily manufactured.

In the method of manufacturing the watering tube 10 of the present embodiment,
The perforation may be performed by irradiating a laser beam.

  According to this configuration, the water sprinkling holes 13 that taper toward the outer side from the inner side of the water flow portion 11 can be manufactured more easily.

  The watering method of the present embodiment is a method of watering using the watering tube 10.

  As described above, according to the present embodiment, it is possible to increase the watering distance and the watering range, and after stopping the water flow to the water flow part 11 and the water flow to the water flow part 11, A sprinkling tube 10 that can prevent water from dripping from the sprinkling holes 13 and a method for manufacturing the same are provided.

  Although the watering tube and its manufacturing method of this embodiment are as above-mentioned, this invention is not limited to the said embodiment, A design change can be suitably carried out within the range which this invention intends.

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

  Evaluation of the watering characteristics of the following experimental examples was performed based on the experiment in the following procedure.

[Experimental example 1] Evaluation of watering characteristics of watering tube having X hole (Manufacturing example 1) Production of watering tube having X hole tapered outwardly, linear low density of 0.925, MFR 0.8g / 10min Density polyethylene and high density polyethylene having a density of 0.957 and MFR of 0.15 g / min, so that the mass ratio is 60/40 (linear low density polyethylene: high density polyethylene = 60: 40), A mixture obtained by mixing 3% by mass of carbon black with respect to the total mass was used as a raw material.
Using a T-die extruder, the 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 a predetermined width to form two sheet pieces. A raw sheet for tube formation was obtained.

  The obtained two sheet pieces were perforated by irradiating two YAG lasers so as to intersect on the other surface side from the one surface side to the other surface side of each sheet piece. By this perforation, the water spray holes collide so that the inner peripheral surface tapers from the one surface side toward the other surface side, and the water sprayed from the tapered side of the two water spray holes collides. It was formed so as to be inclined with respect to the thickness direction of the sheet piece and to be non-vertical water spray holes. That is, as shown in FIG. 11, X holes (X holes formed so as to be connected to each other in the water passage portion) formed of two non-vertical water spray holes were formed.

  Two sheet pieces each having such sprinkling holes are positioned such that the other surface side (tapered tip side) of each sheet piece is located outside and the one surface side (side opposite to the tapered tip end) is located inside. A watering tube as shown in FIG. 1 was manufactured by heat-sealing both ends so that the distance between 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 non-vertical sprinkling hole formed has a hole diameter of the inner opening of the water passage portion of 0.45 mm, a hole diameter of the outer opening of 0.14 mm, a virtual center line with respect to the inner plane of the water passage portion (inside the non-vertical water sprinkling hole The angle formed by the imaginary straight line L) passing through the center of the opening and the center of the outer opening was 35 °. That is, the angle formed by each non-vertical water spray hole with respect to the thickness direction of the water flow portion was 55 °.
The distance H (mm) from the inner surface of the water passage portion of the intersection R where the two virtual center lines L of each non-vertical water spray hole intersect on the outer side of the water passage portion was 0.540 mm.
Since the thickness D (mm) of the water flow portion is 0.550 mm, D and H satisfy the formula 0.5 × D <H <D + 50.

(Manufacture example 2) Manufacture of the water sprinkling tube which has X hole tapered toward the inner side Two sprinkling holes are formed on the unperforated two sheet pieces obtained in manufacture example 1 from the one surface side to the other surface side. Non-vertical inclined with respect to the thickness direction of the sheet piece so that the inner peripheral surface is tapered toward the surface and the water sprayed from the side opposite to the tapered side of the two water spray holes collides. It formed so that it might become a watering hole. That is, an X hole (X hole formed so as to be connected to each other in the water passage portion) formed of two non-vertical water spray holes 23 as shown in FIG. 16 was formed.

Two sheet pieces in which such water spray holes are formed are arranged such that the one surface side (side opposite to the tapered leading end side) of each sheet piece is positioned outside and the other surface side (tapered leading end side) is positioned inside. The heat sealing was performed in the same manner as in Production Example 1 except that they were superposed on each other. Thereby, a watering tube as shown in FIG. 2 having an X hole as shown in FIG. 16 was produced. That is, as shown in FIG. 16, it is composed of two non-vertical watering holes 23 formed so that the inner peripheral surface 25 is tapered toward the inside from the outside of the water passing portion in a state where water has passed. X holes were formed. The fin part was formed in the width direction both ends by heat sealing. Similar to Production Example 1, the seal width of the heat seal (width of the fin portion) was 4.5 mm, and the inner diameter (diameter) of the water spray tube was 34 mmφ when water was poured into the water passage portion.
In the X hole shown in FIG. 16, the inner peripheral surface 25 of each non-vertical sprinkling hole 23 is formed so as to taper from the outside toward the inside. A virtual center line L ′ passing through the center of the opening intersected at the intersection M on the outside of the water passage portion.

Each non-vertical sprinkling hole formed has a hole diameter of the outer opening of the water passage portion of 0.45 mm, a hole diameter of the inner opening of 0.14 mm, and the angle formed by the virtual center line L ′ with respect to the inner surface of the water passage portion is: It was 35 °. That is, the angle formed by each non-vertical water spray hole with respect to the thickness direction of the water flow portion was 55 °.
The distance H (mm) from the water passing portion of the intersection S where the two virtual center lines L ′ of each non-vertical water spray hole intersect outside the water passing portion was 0.540 mm.
Since the thickness D (mm) of the water flow portion is 0.550 mm, D and H satisfy the formula 0.5 × D <H <D + 50.

(Manufacture example 3) Manufacture of the water sprinkling tube which has X hole tapered toward the outer side Two sprinkling holes are formed in the two unperforated sheet pieces obtained in manufacture example 1 from the one surface side to the other surface side. So that the inner peripheral surface is tapered toward the surface and the water sprayed from the tapered side of the two water spray holes is a non-vertical water spray hole inclined with respect to the thickness direction of the sheet piece. Formed. That is, an X hole (an X hole in which each non-vertical watering hole is independent) formed of two non-vertical watering holes as shown in FIG. 9 was formed.

  Two sheet pieces each having such sprinkling holes are positioned such that the other surface side (tapered tip side) of each sheet piece is located outside and the one surface side (side opposite to the tapered tip end) is located inside. A watering tube as shown in FIG. 1 was manufactured by heat-sealing both ends so that the distance between 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 non-vertical sprinkling hole formed has a hole diameter of the inner opening of the water passage portion of 0.50 mm, a hole diameter of the outer opening of 0.20 mm, and a virtual center line with respect to the inner plane of the water passage portion (inside the non-vertical water sprinkling hole The angle formed by the imaginary straight line L) passing through the center of the opening and the center of the outer opening was 35 °. That is, the angle formed by each non-vertical water spray hole with respect to the thickness direction of the water flow portion was 55 °.
The distance H (mm) from the inner surface of the water passage portion of the intersection R where the two virtual center lines L of each non-vertical water spray hole intersect on the outer side of the water passage portion was 1.050 mm.
Since the thickness D (mm) of the water flow portion is 0.550 mm, D and H satisfy the formula 0.5 × D <H <D + 50.

(Manufacture example 4) Manufacture of the water sprinkling tube which has X hole tapered toward the inner side Two sprinkling holes are formed in the two unperforated sheet pieces obtained in manufacture example 1 from the one surface side to the other surface side. Non-vertical inclined with respect to the thickness direction of the sheet piece so that the inner peripheral surface is tapered toward the surface and the water sprayed from the side opposite to the tapered side of the two water spray holes collides. It formed so that it might become a watering hole. That is, an X hole (an X hole in which each non-vertical watering hole is independent) composed of two non-vertical watering holes 23 as shown in FIG. 17 was formed.

Two sheet pieces in which such water spray holes are formed are arranged such that the one surface side (side opposite to the tapered leading end side) of each sheet piece is positioned outside and the other surface side (tapered leading end side) is positioned inside. The heat sealing was performed in the same manner as in Production Example 1 except that they were superposed on each other. Thereby, a watering tube as shown in FIG. 2 having an X hole as shown in FIG. 17 was produced. That is, as shown in FIG. 17, in the state where water has been passed, the inner peripheral surface 25 consists of two non-vertical watering holes 23 formed so as to taper toward the inside from the outside of the water passing portion. X holes were formed. The fin part was formed in the width direction both ends by heat sealing. Similar to Production Example 1, the seal width of the heat seal (width of the fin portion) was 4.5 mm, and the inner diameter (diameter) of the water spray tube was 34 mmφ when water was poured into the water passage portion.
In the X hole shown in FIG. 17, the inner peripheral surface 25 of each non-vertical water spray hole 23 is formed so as to taper from the outside toward the inside. A virtual center line L ′ passing through the center of the opening intersected at the intersection M on the outside of the water passage portion.

Each non-vertical water spray hole formed has a hole diameter of the outer opening of the water passage portion of 0.50 mm, a hole diameter of the inner opening of 0.20 mm, and the angle formed by the virtual center line L ′ with respect to the inner surface of the water passage portion is: It was 35 °. That is, the angle formed by each non-vertical water spray hole with respect to the thickness direction of the water flow portion was 55 °.
The distance H (mm) from the water passing portion of the intersection S where the two virtual center lines L ′ of each non-vertical water spraying hole meet outside the water passing portion was 1.050 mm.
Since the thickness D (mm) of the water flow portion is 0.550 mm, D and H satisfy the formula 0.5 × D <H <D + 50.

(Test Example 1)
Using the watering tubes obtained in Production Examples 1 to 4, the relationship between the watering distance and the Sauter average particle diameter of the ejected water was examined.
Specifically, the watering tube is installed at a height of 2000 mm from the ground so that the elevation angle of the water to be ejected is 45 °, and water is passed through the water flow section so that the water supply pressure is 0.20 MPa. Water was discharged from the X hole. In the state of being ejected in this way, as shown in Table 1, the Sauter average particle diameter, the minimum value and the maximum value of the droplets at the positions at respective distances horizontally apart from the installation position of the watering tube, Measurements were taken at a height of 100 mm from the ground.
The Sauter average particle diameter, minimum value, and maximum value of the droplets were measured by a particle size distribution measuring apparatus using a shadow method.
The results are shown in Table 1. Among these, the graph which shows the relationship between the distance which left | separated horizontally from the position where the watering tube was installed, and the Sauter average particle diameter is shown in FIG. 18, FIG.

  As shown in Table 1 and FIGS. 18 and 19, the watering tubes of Production Examples 1 and 3 are formed such that the inner peripheral surface of the watering hole is tapered toward the outside from the inner side of the water passage portion. It was found that the droplets were much smaller at the same watering distance than the watering tubes of Production Examples 2 and 4 that were not formed in this way.

[Experimental example 2] Evaluation of watering characteristics of a watering tube having a single watering hole (Manufacture example 5) Production of a watering tube having a non-vertical watering hole tapered toward the outside. Using two sheet pieces, punching was performed by irradiating one YAG laser from a direction inclined with respect to a direction perpendicular to each sheet piece from one surface side to the other surface side of each sheet piece. By this perforation, one watering hole was formed such that the inner peripheral surface became a non-vertical watering hole tapered from the one surface side toward the other surface side. That is, a single hole sprinkling hole as shown in FIG. 7 was formed.

  Two sheet pieces each having such sprinkling holes are positioned such that the other surface side (tapered tip side) of each sheet piece is located outside and the one surface side (side opposite to the tapered tip end) is located inside. A watering tube was produced in the same manner as in Production Example 1 except that the watering tube was overlaid. Similar to Production Example 1, the seal width of the heat seal (width of the fin portion) was 4.5 mm, and the inner diameter (diameter) of the water spray tube was 34 mmφ when water was poured into the water passage portion.

  Each non-vertical sprinkling hole formed has a hole diameter of the outer opening of the water passage portion of 0.14 mm, a hole diameter of the inner opening of 0.45 mm, a virtual center line with respect to the inner plane of the water passage portion (the inner side of the non-vertical water sprinkling hole The angle formed by an imaginary straight line passing through the center of the opening and the center of the outer opening was 35 °. That is, the angle formed by each non-vertical water spray hole with respect to the thickness direction of the water flow portion was 55 °.

(Manufacture example 6) Manufacture of the watering tube which has a non-vertical watering hole which tapers inward The two sheet pieces respectively obtained by the manufacturing example 5 in which the non-perpendicular watering hole of a single hole was formed are manufacturing example 5 Contrary to the above, each sheet piece is overlaid so that the one surface side (the side opposite to the tapered tip) is on the outside and the other surface side (tapered tip side) is on the inside. Thus, a watering tube having non-vertical watering holes 23 as shown in FIG. 20 was produced. Similar to Production Example 1, the seal width of the heat seal (width of the fin portion) was 4.5 mm, and the inner diameter (diameter) of the water spray tube was 34 mmφ when water was poured into the water passage portion.

  Each non-vertical sprinkling hole formed has a hole diameter of the inner opening of the water passage portion of 0.14 mm, a hole diameter of the outer opening of 0.45 mm, and a virtual center line with respect to the outer plane of the water passage portion (inside the non-vertical water sprinkling hole The angle formed by an imaginary straight line passing through the center of the opening and the center of the outer opening was 35 °. That is, the angle formed by each non-vertical water spray hole with respect to the thickness direction of the water flow portion was 55 °.

(Manufacture example 7) Manufacture of the watering tube which has the vertical watering hole tapered toward the outside Using the two sheet pieces obtained in manufacture example 1, from one surface side of each sheet piece to the other surface side, 1 Drilling was performed by irradiating two YAG lasers in a direction perpendicular to each sheet piece. By this perforation, one sprinkling hole was formed so that the inner peripheral surface became a tapered vertical sprinkling hole from the one surface side toward the other surface side. That is, as shown in FIG. 4, a single hole sprinkling hole was formed.

  Two sheet pieces each having such sprinkling holes are positioned such that the other surface side (tapered tip side) of each sheet piece is located outside and the one surface side (side opposite to the tapered tip end) is located inside. In the same manner as in Production Example 1, a watering tube was produced. Similar to Production Example 1, the seal width of the heat seal (width of the fin portion) was 4.5 mm, and the inner diameter (diameter) of the water spray tube was 34 mmφ when water was poured into the water passage portion.

  Each formed vertical water spray hole has a hole diameter of the inner opening of the water passage portion of 0.36 mm, a hole diameter of the outer opening of 0.14 mm, and a virtual center line with respect to the inner plane of the water passage portion (the inner opening of the vertical water spray hole). The angle of the imaginary straight line passing through the center and the center of the outer opening was 90 °. That is, the thickness direction of the water flow portion and the virtual center line of each vertical water spray hole were parallel.

(Manufacture example 8) Manufacture of the watering tube which has a vertical watering hole tapering toward inner side Two sheet pieces obtained in manufacture example 7 and each of which the vertical watering hole was formed in the above-mentioned one side side of each sheet piece ( A water sprinkling tube was manufactured in the same manner as in Production Example 7 except that they were overlapped so that the side opposite to the tapered tip was on the outside and the other surface side (tapered tip) was on the inside. That is, a watering tube having a single hole vertical watering hole 23 as shown in FIG. 21 was manufactured. Similar to Production Example 1, the seal width of the heat seal (width of the fin portion) was 4.5 mm, and the inner diameter (diameter) of the water spray tube was 34 mmφ when water was poured into the water passage portion.

  Each formed vertical water spray hole has a hole diameter of the outer opening of the water passage portion of 0.36 mm, a hole diameter of the inner opening of 0.14 mm, and a virtual center line with respect to the outer plane of the water passage portion (the inner opening of the vertical water spray hole). The angle formed by a virtual straight line passing through the center and the center of the outer opening was 90 °. That is, the thickness direction of the water flow portion and the virtual center line of each vertical water spray hole were parallel.

(Test Example 2)
Using the watering tubes obtained in Production Examples 5 to 8, the watering pressure and the flow rate of water ejected from the watering holes in water flow are the same as in Test Example 1 except that the water supply pressure is 0.14 MPa. In addition, the irrigation strength was examined, and it was also examined whether or not the water dropped from the non-vertical sprinkling holes after the water flow and after the water flow stop.
The results are shown in Table 2. Moreover, the graph which shows the relationship between the distance which left | separated horizontally from the position where the watering tube was installed, and irrigation intensity | strength is shown to FIG. 22, FIG.

As shown in Table 2, a sprinkling tube having a single sprinkling hole that is tapered toward the outside (manufacturing examples 5 and 7), regardless of whether it is a sprinkling tube having a single non-vertical sprinkling hole or a single vertical sprinkling hole. ) Is sprinkled both in the water flow (watering) to the water passing part and after the water flow is stopped, rather than the watering tube (Production Examples 6 and 8) having a watering hole tapered toward the inside. Dropping from the hole was suppressed.
The reason for this is not clear, but in Production Examples 5 and 7, the flow rate of water passing through the sprinkling holes is faster than in Production Examples 6 and 8, and water particles stagnating near the outlet of the sprinkling holes are generated. As a result of the disappearance, it is presumed that the dropout was suppressed.
Moreover, after the water flow, the dropping of the spatter from the sprinkling holes was suppressed in Production Examples 5 and 7 than in Production Examples 6 and 8.
The reason for this is not clear, but since the resistance that water receives from the sprinkling holes when water passes through the sprinkling holes, it becomes difficult for water to pass through the sprinkling holes. Is presumed to be suppressed.

  As shown in FIG. 22 and FIG. 23, as shown in FIG. 22 and FIG. 23, even if the watering tube has a single non-vertical watering hole and a vertical watering hole, as shown in FIGS. The sprinkling tube (Manufacturing Examples 5 and 7) having a watering hole has a larger sprinkling flow rate than the watering tube (Manufacturing Examples 6 and 8) having a watering hole tapered toward the inside, and water can be sprinkled far away. The watering range was wide.

In addition, production examples 5 and 7 can be sprinkled farther with the same water supply pressure by increasing the flow rate of water passing through the sprinkling holes than production examples 6 and 8, and the flow rate of water to be ejected is higher. Because it increases, water can be sprayed over a wider area.
Therefore, when watering a house or the like, for example, when watering holes tapered toward the inside as in Production Examples 6 and 8 are used, for example, 10 watering tubes need to be used. If the sprinkling holes tapered toward the outside such as 5 and 7 are used, it is possible to save labor that only six sprinkling tubes need be used.

  1: Agricultural house, 3: Building, 5a, 5b: Wall, 7: Support, 9: Fixing member, 10: Sprinkling tube, 11: Sprinkling part, 13: Sprinkling hole, 13a: Vertical sprinkling hole, 13b: Non-vertical sprinkling holes, 15, 15a, 15b: inner peripheral surface, 17: sheet member, 21: fin portion

Claims (5)

It is formed so that water is passed through the interior, and includes a water passage portion formed with a plurality of water spray holes for ejecting the internal water to the outside,
The water spray holes are formed so that the inner peripheral surfaces of the water spray holes taper from the inner side to the outer side of the water flow part in a state where water is passed through the water flow part. A watering tube.   Two or more sprinkling holes of the plurality of sprinkling holes are formed so as to be inclined with respect to the thickness direction of the water passing portion so that water ejected from the two or more sprinkling holes collides with each other. The watering tube according to claim 1. The thickness of the water flow portion is D (mm),
When the distance between the intersection of the two or more virtual straight lines passing through the centers of the two or more sprinkling holes that collide with each other on the side where the water flies and the inner surface of the water passage portion is H (mm),
Said D and H are the formula 0.5xD <H <D + 50
The watering tube of Claim 2 which satisfy | fills. It is a manufacturing method of the watering tube in any one of Claims 1-3,
Using two sheets,
A plurality of sprinkling holes are formed in at least one of the two sheets by punching from one side to the other side so that the opening on the one side is larger than the opening on the other side. Process,
A method of manufacturing a water spray tube, comprising: a step of heat-sealing both ends of the two sheets so that the opening on the one surface side is positioned inside.   The method of manufacturing a watering tube according to claim 4, wherein the perforation is performed by irradiating a laser beam.