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WO2021039623A1 - Goutteur et tuyau d'irrigation goutte à goutte - Google Patents

Goutteur et tuyau d'irrigation goutte à goutte Download PDF

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Publication number
WO2021039623A1
WO2021039623A1 PCT/JP2020/031598 JP2020031598W WO2021039623A1 WO 2021039623 A1 WO2021039623 A1 WO 2021039623A1 JP 2020031598 W JP2020031598 W JP 2020031598W WO 2021039623 A1 WO2021039623 A1 WO 2021039623A1
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WIPO (PCT)
Prior art keywords
pedestal
tube
irrigation liquid
emitter
diaphragm portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/031598
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English (en)
Japanese (ja)
Inventor
昌宏 木立
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Enplas Corp
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Enplas Corp
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Filing date
Publication date
Application filed by Enplas Corp filed Critical Enplas Corp
Publication of WO2021039623A1 publication Critical patent/WO2021039623A1/fr
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G25/00—Watering gardens, fields, sports grounds or the like
    • A01G25/02—Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion

Definitions

  • the present invention relates to an emitter and a drip irrigation tube having the emitter.
  • the drip irrigation method has been known as one of the plant cultivation methods.
  • the drip irrigation method is a method in which a drip irrigation tube is placed on the soil in which a plant is planted, and an irrigation liquid such as water or liquid fertilizer is dropped from the drip irrigation tube to the soil.
  • an irrigation liquid such as water or liquid fertilizer is dropped from the drip irrigation tube to the soil.
  • the drip irrigation method has attracted particular attention because it can minimize the consumption of irrigation liquid.
  • the drip irrigation tube is a tube in which a plurality of through holes for discharging the irrigation liquid are formed, and a plurality of emitters (“) for discharging the irrigation liquid from each through hole, which is joined to the inner wall surface of the tube. Also called “dripper").
  • the emitter can keep the discharge amount of irrigation liquid constant even if the pressure inside the tube is different.
  • the pressure inside the tube is high at a position close to the liquid feed pump and low at a position far from the liquid feed pump, but the discharge amount is constant regardless of whether the emitter is installed near or far from the liquid feed pump. Is desired.
  • Patent Document 1 discloses a mechanism for adjusting a flow rate by bending a membrane (diaphragm) toward a recessed outlet (communication hole) according to a water pressure in a conduit (tube).
  • the emitter is formed of a material containing resin, elastomer, rubber, etc., and the above diaphragm is also formed of such a material.
  • the hardness of these materials may change depending on the temperature. Therefore, the degree of deformation of the diaphragm portion changes due to the temperature change, and the pressure of the irrigation liquid, the deformation of the diaphragm portion, and the flow rate adjusting function by the communication holes may be affected.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an emitter capable of appropriately adjusting the flow rate even if the hardness of the diaphragm changes due to a temperature change.
  • the emitter of the present invention is joined to a position on the inner wall surface of a tube through which an irrigation liquid flows, corresponding to a discharge port communicating with the inside and outside of the tube, and the irrigation liquid in the tube is quantitatively discharged from the discharge port.
  • An emitter for discharging the irrigation liquid to the outside of the tube a water intake part for taking in the irrigation liquid, a discharge part for discharging the irrigation liquid taken in from the water intake part, and the water intake part.
  • the flow rate adjusting unit has a flexible accommodating portion for receiving the irrigation liquid taken in from the water intake portion, a pedestal having a communication hole for communicating the accommodating portion and the discharging portion, and a flexible portion.
  • the pedestal has a property and has a diaphragm portion that deforms toward the pedestal when the pressure of the irrigation liquid in the tube is applied, and a flexible diaphragm portion that presses the pedestal.
  • the drip irrigation tube of the present invention has a tube having a discharge port for discharging an irrigation liquid, and the above-mentioned emitter joined at a position corresponding to the discharge port on the inner wall surface of the tube.
  • an emitter capable of appropriately adjusting the flow rate even if the hardness of the diaphragm changes due to a temperature change. Further, according to the present invention, it is possible to provide a drip irrigation tube having the emitter.
  • FIG. 1A shows a vertical cross-sectional view of the tube and the emitter
  • FIG. 1B shows a cross-sectional view of the tube and the emitter
  • 2A is a plan view of the emitter viewed from the front side
  • FIG. 2B is a bottom view of the emitter viewed from the back side
  • FIG. 2C is a sectional view taken along line AA of FIG. 2B
  • FIG. 3 is a cross-sectional view of the pedestal.
  • FIG. 4A shows the operation of the flow rate adjusting unit at low temperature
  • FIG. 4B shows the operation of the flow rate adjusting unit at high temperature
  • FIG. 4C shows the operation of the flow rate adjusting unit at high temperature when the pedestal has a stopper.
  • FIG. 5A shows the relationship between the pressure and the flow rate in the conventional emitter
  • FIG. 5B shows the relationship between the pressure and the flow rate in the emitter according to the embodiment of the present invention.
  • FIG. 1 shows a drip irrigation tube 100 according to an embodiment of the present invention. Note that FIG. 1A shows a vertical cross-sectional view of the tube 110 and the emitter 120, and FIG. 1B shows a cross-sectional view of the tube 110 and the emitter 120.
  • the drip irrigation tube 100 has a tube 110 and an emitter 120.
  • the tube 110 is a tube for flowing an irrigation liquid.
  • irrigation liquids include water, liquid fertilizers, pesticides and mixtures thereof.
  • the direction in which the irrigation liquid flows in the tube 110 is not particularly limited.
  • the material of the tube 110 is not particularly limited. In this embodiment, the material of the tube 110 is polyethylene.
  • a plurality of discharge ports 111 for discharging the irrigation liquid at predetermined intervals (for example, 200 mm or more and 500 mm or less) in the axial direction of the tube 110 are formed on the tube wall of the tube 110.
  • the diameter of the opening of the discharge port 111 is not particularly limited as long as the irrigation liquid can be discharged. In the present embodiment, the diameter of the opening of the discharge port 111 is 1.5 mm.
  • Emitters 120 are joined to positions of the inner wall surface 112 of the tube corresponding to the discharge port 111.
  • the cross-sectional shape and cross-sectional area perpendicular to the axial direction of the tube 110 are not particularly limited as long as the emitter 120 can be arranged inside the tube 110 without leakage.
  • the drip irrigation tube 100 is produced by joining the back surface 125 (see FIGS. 2B and C) of the emitter 120 to the inner wall surface 112 of the tube.
  • the method of joining the tube 110 and the emitter 120 is not particularly limited. Examples of the method of joining the tube 110 and the emitter 120 include welding of the resin material constituting the tube 110 or the emitter 120, and bonding with an adhesive.
  • the discharge port 111 may be formed after joining the tube 110 and the emitter 120, or may be formed before joining.
  • FIG. 2A is a plan view of the emitter 120 viewed from the front side
  • FIG. 2B is a bottom view of the emitter 120 viewed from the back side
  • FIG. 2C is a cross-sectional view taken along line AA of FIG. 2B.
  • FIG. 3 is a cross-sectional view of the pedestal 161.
  • the emitter 120 is joined to the inner wall surface 112 of the tube through which the irrigation liquid flows, at a position corresponding to the discharge port 111 communicating with the inside and outside of the tube 110, and the irrigation liquid in the tube 110 is quantitatively discharged from the discharge port 111. Discharge to the outside of the tube 110.
  • the emitter 120 is joined to the inner wall surface 112 of the tube so that the discharge portion 137 covers the discharge port 111 of the tube 110.
  • the outer shape of the emitter 120 is not particularly limited as long as it can be brought into close contact with the inner wall surface 112 of the tube and cover the discharge port 111.
  • the shape of the back surface 125 joined to the inner wall surface in the cross section of the emitter 120 perpendicular to the axial direction of the tube 110 is convex toward the inner wall surface 112 of the tube so as to be along the inner wall surface 112 of the tube. It has a substantially arc shape.
  • the size of the emitter 120 is not particularly limited and may be appropriately determined based on a desired amount of irrigation liquid discharged from the discharge port 111. In the present embodiment, the length of the emitter 120 in the long side direction is 19 mm, the length in the short side direction is 8 mm, and the height is 2.7 mm.
  • the emitter 120 is preferably formed of an elastic material.
  • materials for the emitter 120 include materials containing resins, elastomers and rubbers.
  • resins include thermoplastic resins, thermosetting resins and the like.
  • thermoplastics include polyethylene.
  • the flexibility of the emitter 120 can be adjusted by using an elastic material.
  • the emitter 120 according to the present embodiment exerts a particularly excellent effect when the diaphragm portion 153 and the pedestal support portion 163, which will be described later, are more easily deformed at a high temperature than at a low temperature. Therefore, when the diaphragm portion 153 and the pedestal support portion 163 contain a thermoplastic resin, the emitter 120 according to the present embodiment exerts a particularly excellent effect.
  • Examples of methods for adjusting the flexibility of the emitter 120 include selecting an elastic resin and adjusting the mixing ratio of the elastic resin to a hard resin material.
  • the index indicating the hardness of the material of the emitter 120 includes the durometer hardness specified in JIS K6253-3 (2012).
  • the durometer hardness includes type A, type D, type E, and the like, depending on the type of durometer used for measurement. For example, when the hardness 40 is shown using a type D durometer, the durometer hardness D40 is obtained. When the numerical value of each type is the same, the durometer hardness is the hardest in type D, and becomes softer in the order of type A and type E.
  • the emitter 120 flows the water intake section 131 for receiving the irrigation liquid and the irrigation liquid taken in from the water intake section 131 into the decompression channel groove 133.
  • It has an accommodating portion 135 for accommodating, a pedestal 161 having a communication hole 151 for communicating the irrigation liquid in the accommodating portion 135 to the discharge portion 137, and a diaphragm portion 153.
  • the connecting groove 132 becomes the connecting flow path 142
  • the decompression flow path groove 133 becomes the decompression flow path 143.
  • a flow path connecting the water intake section 131, the connection flow path 142, the decompression flow path 143, the through hole 134, the accommodating section 135, the communication hole 151, and the discharge section 137 is formed.
  • the flow path allows the irrigation liquid to flow from the intake section 131 to the discharge section 137.
  • the water intake unit 131 is arranged in a region substantially half of the surface 124 of the emitter 120.
  • the number of water intake units 131 is not particularly limited. In the present embodiment, the two intake portions 131 are arranged along the long axis direction of the emitter 120.
  • the flow rate adjusting unit 136 is arranged in the region of the surface 124 where the water intake unit 131 is not arranged.
  • the water intake unit 131 has a water intake side screen unit 171 and a water intake through hole 147.
  • the water intake side screen portion 171 prevents suspended matter in the irrigation liquid taken into the emitter 120 from entering the water intake through hole 147.
  • the water intake side screen portion 171 is open in the tube 110 and has a water intake recess 173 and a ridge 174.
  • the water intake recess 173 is a recess formed on the surface 124 of the emitter 120 in almost the entire region of one half surface on which the diaphragm portion 153 is not arranged.
  • the depth of the water intake recess 173 is not particularly limited, and is appropriately set depending on the size of the emitter 120.
  • a ridge 174 is formed on the bottom surface of the water intake recess 173. Further, a water intake through hole 147 is formed on the bottom surface of the water intake recess 173.
  • the ridge 174 is arranged on the bottom surface of the water intake recess 173.
  • the arrangement and number of the ridges 174 are not particularly limited as long as the irrigation liquid can be taken in from the opening side of the water intake recess 173 and the intrusion of suspended matter in the irrigation liquid can be prevented.
  • one long ridge 174 is arranged along the long axis direction of the water intake recess 173, and a plurality of short ridges 174 are arranged along the long axis direction of the water intake recess 173. ing.
  • a water intake through hole 147 is formed on the bottom surface of the water intake recess 173.
  • the ridge 174 may be formed so that the width decreases from the surface 124 of the emitter 120 toward the bottom surface of the water intake recess 173, or the same from the surface 124 of the emitter 120 to the bottom surface of the water intake recess 173. It may be formed in a width.
  • the water intake through hole 147 is formed on the bottom surface of the water intake recess 173.
  • the shape and number of the water intake through holes 147 are not particularly limited as long as the irrigation liquid taken into the water intake recess 173 can be taken into the emitter 120.
  • the water intake through hole 147 is a long hole formed along the long axis direction of the bottom surface of the water intake recess 173. Since the elongated hole is covered with a plurality of ridges 174, the water intake through hole 147 appears to be divided into a large number of through holes when viewed from the front side.
  • the irrigation liquid that has flowed through the tube 110 is taken into the emitter 120 while the water intake side screen portion 171 prevents suspended matter from entering the water intake through hole 147.
  • connection groove 132 (connection flow path 142) connects the water intake through hole 147 (water intake portion 131) and the decompression flow path groove 133 (decompression flow path 143).
  • the connection groove 132 is formed along the outer edge of the back surface 125 of the emitter 120.
  • a decompression flow path groove 133 is connected to one end of the connection groove 132.
  • the decompression flow path groove 133 (decompression flow path 143) connects the connection groove 132 (connection flow path 142) and the through hole 134.
  • the decompression flow path groove 133 communicates with the water intake unit 131 to form a decompression flow path 143 in which the irrigation liquid flows while depressurizing.
  • the decompression flow path groove 133 is arranged at the center of the back surface 125 in the minor axis direction along the major axis direction.
  • the upstream end of the decompression flow path groove 133 is connected to the connection groove 132, and the through hole 134 communicates with the downstream end.
  • the shape of the decompression flow path groove 133 is not particularly limited as long as it can exhibit the function of depressurizing and flowing the irrigation liquid.
  • the plan view shape of the decompression flow path groove 133 is a zigzag shape.
  • substantially triangular prism-shaped protrusions 175 protruding from the inner side surface are alternately arranged along the flow direction of the irrigation liquid.
  • the convex portion 175 is arranged so that the tip thereof does not exceed the central axis of the decompression flow path groove 133 when viewed in a plan view.
  • the through hole 134 communicates the decompression flow path groove 133 (decompression flow path 143) (see FIG. 2B) with the accommodating portion 135 (see FIG. 2A) to accommodate the irrigation liquid flowing through the decompression flow path 143.
  • the upstream end of the through hole 134 is connected to the decompression flow path groove 133, and the downstream end is connected to the accommodating portion 135.
  • the shape of the through hole 134 is not particularly limited as long as it can exhibit the above-mentioned function.
  • the through hole 134 is arranged at the center of the emitter 120 in the minor axis direction.
  • the flow rate adjusting unit 136 is arranged in the flow path and adjusts the flow rate of the irrigation liquid flowing in the flow path according to the pressure of the irrigation liquid in the tube 110.
  • the flow rate adjusting unit 136 is arranged in a region where the water intake unit 131 of the emitter 120, the connecting groove 132 (connecting flow path 142), and the decompression flow path groove 133 (decompression flow path 143) are not arranged.
  • the flow rate adjusting unit 136 includes an accommodating unit 135, a pedestal 161, a communication hole 151, a diaphragm unit 153, a connecting groove 162, and a pedestal support unit 163.
  • FIG. 3 is a cross-sectional view of the pedestal 161.
  • the configuration of the flow rate adjusting unit 136 will be described with reference to FIG.
  • the accommodating unit 135 communicates with the decompression channel groove 133 and receives the irrigation liquid taken in from the water intake unit 131.
  • the irrigation liquid flows into the accommodating portion 135 through the through hole 134.
  • a pedestal 161 is arranged on the lower side (back surface 125 side) with respect to the accommodating portion 135, and a diaphragm portion 153 is arranged on the upper side (front surface 124 side) with respect to the accommodating portion 135. That is, the accommodating portion 135 is arranged between the diaphragm portion 153 and the pedestal 161.
  • the pedestal 161 has a communication hole 151 that communicates the accommodating portion 135 and the discharging portion 137.
  • the pedestal 161 functions as a valve structure that adjusts the flow rate of the irrigation liquid flowing in the flow path according to the pressure of the irrigation liquid in cooperation with the diaphragm portion 153.
  • the pedestal 161 is arranged at a position where the diaphragm portion 153 deformed by the pressure of the irrigation liquid can come into contact with the diaphragm portion 153.
  • the shape of the pedestal 161 is not particularly limited.
  • the shape of the surface of the pedestal 161 facing the diaphragm portion 153 may be a curved surface or a flat surface.
  • the shape of the surface of the pedestal 161 facing the diaphragm portion 153 is a flat surface. Further, when the pedestal 161 is pressed by the diaphragm portion 153 and moves toward the inner wall surface 112 of the tube as described later, the pedestal 161 comes into contact with the inner wall surface 112 of the tube to suppress movement of a predetermined distance or more. It may have a stopper 164 (see FIG. 4C). The stopper 164 is arranged at least a part of the back side of the pedestal 161 (the side opposite to the side facing the diaphragm portion 153) so as to face the inner wall surface 112 of the tube, for example.
  • the shape of the stopper 164 is not particularly limited as long as the movement of the pedestal 161 beyond a predetermined distance can be suppressed.
  • the shape of the stopper 164 is preferably a shape that does not restrict the flow of the irrigation liquid that has passed through the communication hole 151 when the stopper 164 comes into contact with the inner wall surface 112 of the tube.
  • the communication hole 151 communicates the accommodating portion 135 and the discharge portion 137, and allows the irrigation liquid that has flowed into the accommodating portion 135 to flow toward the discharge portion 137.
  • the communication hole 151 is opened in the central portion of the pedestal 161.
  • the size of the opening of the communication hole 151 is not particularly limited and can be appropriately set according to the desired flow rate of the irrigation liquid.
  • the connecting groove 162 is a groove formed in the pedestal 161 for guiding the irrigation liquid in the accommodating portion 135 to the communication hole 151 even when the diaphragm portion 153 is in contact with the pedestal 161.
  • One end of the communication groove 162 communicates with the communication hole 151.
  • the other end of the connecting groove 162 is arranged outside the outer edge of the contact area of the pedestal 161 in a state where the diaphragm portion 153 is in contact with the pedestal 161.
  • the other end of the connecting groove 162 is arranged on the outer edge of the pedestal 161.
  • the pedestal 161 arranged in the accommodating portion 135 and the diaphragm portion 153 facing the pedestal 161 communicate with each other according to the pressure of the irrigation liquid in the tube 110.
  • the flow rate of the irrigation liquid flowing through the hole 151 is adjusted.
  • the diaphragm portion 153 has a circular shape in a plan view (see FIG. 2A).
  • the diaphragm portion 153 is flexible and deforms toward the pedestal 161 when it receives the pressure of the irrigation liquid in the tube 110.
  • the diaphragm portion 153 is more easily deformed at a high temperature than at a low temperature.
  • the diaphragm portion 153 is, for example, a film arranged on the pedestal 161 so as not to come into contact with the pedestal 161 when not under pressure.
  • the shape of the diaphragm portion 153 can be appropriately designed so as to have a flow rate adjusting function according to the shape of the pedestal 161.
  • the pedestal support portion 163 supports the pedestal 161.
  • the pedestal support portion 163 is flexible and deforms so that when the diaphragm portion 153 presses the pedestal 161, the pedestal 161 moves toward the inner wall surface 112 of the tube.
  • the pedestal support portion 163 is more easily deformed at a high temperature than at a low temperature.
  • the pedestal support portion 163 preferably supports the pedestal 161 so as not to come into contact with the inner wall surface 112 of the tube when the diaphragm portion 153 does not press the pedestal 161.
  • the material, thickness, length, etc. of the pedestal support portion 163 are appropriately adjusted so as to have a flow rate adjusting function as described later.
  • the material of the pedestal support portion 163 is preferably a thermoplastic resin from the viewpoint of being easily softened at a high temperature.
  • the thickness of the pedestal support portion 163 is preferably 0.2 mm or more and 1.0 mm or less, and more preferably 0.3 mm or more and 0.7 mm or less, from the viewpoint of having a flow rate adjusting function.
  • the length of the pedestal support portion 163 (the length in the direction perpendicular to the thickness of the pedestal support portion 163) is preferably 3 mm or more and 8 mm or less, and 4 mm or more and 6 mm from the viewpoint of having a flow rate adjusting function.
  • the hardness of the pedestal support portion 163 is preferably A30 or more and D60 or less, and more preferably A40 or more and D50 or less, from the viewpoint of having a flow rate adjusting function.
  • the durometer hardness at 50 ° C. is preferably A10 or more and D50 or less, and more preferably A20 or more and D40 or less.
  • the discharge unit 137 temporarily stores the irrigation liquid from the communication hole 151. As described above, the emitter 120 is joined to the inner wall surface 112 of the tube so that the discharge portion 137 covers the discharge port 111 of the tube 110. The irrigation liquid that has reached the discharge unit 137 is discharged to the outside from the discharge port 111 of the tube 110.
  • the method for manufacturing the emitter is not particularly limited.
  • the emitter of this embodiment can be manufactured, for example, by injection molding.
  • the diaphragm portion and the other portion may be formed separately and joined to each other.
  • the diaphragm portion and the emitter body may be integrally formed via a hinge to rotate the hinge. Both may be joined by moving.
  • the hinge may be cut after joining the diaphragm portion and the emitter body.
  • FIGS. 4A to 4C show an example of the operation of the flow rate adjusting unit 136 according to the pressure of the irrigation liquid in the tube 110.
  • FIG. 4A shows the operation of the flow rate adjusting unit 136 at a low temperature (20 ° C.).
  • FIG. 4B shows the operation of the flow rate adjusting unit 136 at a high temperature (50 ° C.).
  • FIG. 4C shows the operation of the flow rate adjusting unit 136 at a high temperature (50 ° C.) when the pedestal 161 has a stopper 164 that suppresses the movement of the pedestal 161 by a predetermined distance or more.
  • FIG. 4A shows the operation of the flow rate adjusting unit 136 at a low temperature (20 ° C.).
  • the leftmost figure of FIG. 4A shows a state where the pressure of the irrigation liquid in the tube 110 is very low (eg about 0 bar).
  • the diaphragm portion 153 is hardly deformed because it is hardly pressurized, and is not in contact with the pedestal 161.
  • the pedestal support portion 163 is not deformed, and the position of the pedestal 161 is the same as the initial state.
  • the irrigation liquid that has flowed from the decompression flow path 143 to the accommodating portion 135 mainly flows through the large gap between the diaphragm portion 153 and the pedestal 161 and flows into the communication hole 151.
  • the second figure from the left in FIG. 4A shows a state in which the pressure of the irrigation liquid in the tube 110 is somewhat low (for example, 0.2 bar).
  • the diaphragm portion 153 is deformed and approaches the pedestal 161, but is not in contact with the pedestal 161. Further, since the temperature is low and the diaphragm portion 153 does not press the pedestal 161, the pedestal support portion 163 is not deformed, and the position of the pedestal 161 is the same as the initial state.
  • the irrigation liquid that has flowed from the decompression flow path 143 to the accommodating portion 135 flows into the communication hole 151 through a small gap between the diaphragm portion 153 and the pedestal 161 and the connecting groove 162.
  • the pressure of the irrigation liquid in the tube 110 increases (that is, the flow velocity of the irrigation liquid increases), and the gap between the diaphragm portion 153 and the pedestal 161 becomes smaller (cross-sectional area through which the irrigation liquid passes). Even if the pressure of the irrigation liquid in the tube 110 increases, the flow rate of the irrigation liquid discharged from the discharge port 111 of the tube 110 is almost unchanged.
  • the third figure from the left in FIG. 4A shows a state in which the pressure of the irrigation liquid in the tube 110 is somewhat high (for example, 0.5 bar).
  • the diaphragm portion 153 is deformed and comes into contact with the pedestal 161.
  • the pedestal 161 is pressed by the diaphragm portion 153, but the pedestal support portion 163 does not deform because the temperature is low, and the position of the pedestal 161 is the same as the initial state.
  • the irrigation liquid that has flowed from the decompression flow path 143 to the accommodating portion 135 flows into the communication hole 151 only through the connecting groove 162.
  • the fourth figure from the left in FIG. 4A shows a state in which the pressure of the irrigation liquid in the tube 110 is high (for example, 1 bar). Even in this state, the diaphragm portion 153 is deformed and comes into contact with the pedestal 161. The pedestal 161 is pressed by the diaphragm portion 153, but the pedestal support portion 163 does not deform because the temperature is low, and the position of the pedestal 161 is the same as the initial state. Even in this state, since the diaphragm portion 153 is in contact with the pedestal 161, the irrigation liquid that has flowed from the decompression flow path 143 to the accommodating portion 135 flows into the communication hole 151 only through the connecting groove 162.
  • the contact area between the diaphragm portion 153 and the pedestal 161 is larger than that in the state where the pressure of the irrigation liquid is high to some extent (for example, 0.5 bar), the flow path formed by the diaphragm 153 and the connecting groove 162 The distance becomes longer.
  • the increased pressure of the irrigation liquid in the tube 110 and the longer distance that the irrigation liquid passes only through the connecting groove 162 are offset, and the pressure of the irrigation liquid in the tube 110 increases.
  • the flow rate of the irrigation liquid discharged from the discharge port 111 of the tube 110 is almost the same.
  • FIG. 4B shows the operation of the flow rate adjusting unit 136 at a high temperature (50 ° C.).
  • the leftmost figure of FIG. 4B shows a very low pressure of the irrigation liquid in the tube 110 (eg about 0 bar).
  • the diaphragm portion 153 is hardly deformed because it is hardly pressurized, and is not in contact with the pedestal 161.
  • the pedestal support portion 163 is not deformed, and the position of the pedestal 161 is the same as the initial state.
  • the irrigation liquid that has flowed from the decompression flow path 143 to the accommodating portion 135 mainly flows through the large gap between the diaphragm portion 153 and the pedestal 161 and flows into the communication hole 151.
  • the second figure from the left in FIG. 4B shows a state in which the pressure of the irrigation liquid in the tube 110 is somewhat low (for example, 0.2 bar).
  • the diaphragm portion 153 is softened because it is under a high temperature, and even with this pressure, the diaphragm portion 153 is greatly deformed and comes into contact with the pedestal 161.
  • the diaphragm portion 153 is not pressed. Therefore, although the pedestal 161 is brought into contact with the diaphragm portion 153, the pedestal support portion 163 is hardly deformed, and the position of the pedestal 161 is almost the same as the initial state.
  • the third figure from the left in FIG. 4B shows a state in which the pressure of the irrigation liquid in the tube 110 is somewhat high (for example, 0.5 bar).
  • the diaphragm portion 153 since the diaphragm portion 153 is under high temperature, it softens and is greatly deformed to come into contact with the entire pedestal 161 and press the pedestal 161.
  • the pedestal support portion 163 When the pedestal 161 is pressed by the diaphragm portion 153, the pedestal support portion 163 is easily deformed due to the high temperature, and the pedestal 161 is moved toward the inner wall surface 112 of the tube. As a result, a part of the diaphragm portion 153 that was in contact with the entire pedestal 161 is separated from the pedestal 161.
  • the distance of the flow path formed by the diaphragm portion 153 and the connecting groove 162 is longer than that in the state where the pressure of the irrigation liquid is low to some extent (for example, 0.2 bar), but the entire diaphragm portion 153 and the pedestal 161 are formed.
  • the distance between the flow path formed by the diaphragm portion 153 and the connecting groove 162 is shorter than that in the case where the two are in contact with each other.
  • the fourth figure from the left in FIG. 4B shows a state in which the pressure of the irrigation liquid in the tube 110 is high (for example, 1 bar).
  • the diaphragm portion 153 is at a high temperature, so it softens and is greatly deformed to strongly press the pedestal 161.
  • the pedestal support portion 163 is deformed to the limit due to the high temperature, and the pedestal 161 is moved to the limit toward the inner wall surface 112 of the tube.
  • the diaphragm portion 153 contacts the entire pedestal 161. Therefore, the irrigation liquid flowing from the decompression flow path 143 to the accommodating portion 135 flows into the communication hole 151 only through the connecting groove 162. ..
  • FIG. 4C shows the operation of the flow rate adjusting unit 136 at a high temperature (50 ° C.) when the pedestal 161 has a stopper 164 that suppresses the movement of the pedestal 161 over a predetermined distance.
  • the leftmost figure of FIG. 4C shows a state where the pressure of the irrigation liquid in the tube 110 is very low (for example, about 0 bar).
  • the irrigation liquid that has flowed from the decompression flow path 143 to the accommodating portion 135 mainly flows through the large gap between the diaphragm portion 153 and the pedestal 161 and flows into the communication hole 151.
  • the pedestal support portion 163 is not deformed, and the stopper 164 is not in contact with the inner wall surface 112 of the tube.
  • the second figure from the left in FIG. 4C shows a state in which the pressure inside the tube 110 is somewhat low (for example, 0.2 bar).
  • the diaphragm portion 153 is softened because it is under a high temperature, and even with this pressure, the diaphragm portion 153 is greatly deformed and comes into contact with the pedestal 161.
  • the diaphragm portion 153 is not pressed enough. Therefore, although the pedestal 161 is brought into contact with the diaphragm portion 153, the pedestal support portion 163 is hardly deformed, and the position of the pedestal 161 is almost the same as the initial state.
  • the third figure from the left in FIG. 4C shows a state in which the pressure of the irrigation liquid in the tube 110 is somewhat high (for example, 0.5 bar).
  • the diaphragm portion 153 since the diaphragm portion 153 is under high temperature, it softens and is greatly deformed to come into contact with the entire pedestal 161 and press the pedestal 161.
  • the pedestal support portion 163 When the pedestal 161 is pressed by the diaphragm portion 153, the pedestal support portion 163 is easily deformed due to the high temperature, and the pedestal 161 is moved toward the inner wall surface 112 of the tube. As a result, a part of the diaphragm portion 153 that was in contact with the entire pedestal 161 is separated from the pedestal 161.
  • the distance of the flow path formed by the diaphragm portion 153 and the connecting groove 162 is longer than that in the state where the pressure of the irrigation liquid is low to some extent (for example, 0.2 bar), but the entire diaphragm portion 153 and the pedestal 161 are formed.
  • the distance between the flow path formed by the diaphragm portion 153 and the connecting groove 162 is shorter than that in the case where the two are in contact with each other.
  • the fourth figure from the left in FIG. 4C shows a state in which the pressure of the irrigation liquid in the tube 110 is high (for example, 1 bar).
  • the diaphragm portion 153 is at a high temperature, so it softens and is greatly deformed to strongly press the pedestal 161.
  • the pedestal support portion 163 is easily deformed due to the high temperature, and the pedestal 161 is moved toward the inner wall surface 112 of the tube.
  • the pedestal 161 is moved until the stopper 164 comes into contact with the inner wall surface 112 of the tube.
  • the diaphragm portion 153 contacts the entire pedestal 161. Therefore, the irrigation liquid flowing from the decompression flow path 143 to the accommodating portion 135 flows into the communication hole 151 only through the connecting groove 162. .. As a result, the movement of the pedestal 161 beyond a predetermined level is suppressed.
  • FIG. 5A shows the relationship between the pressure and the flow rate in the conventional emitter
  • FIG. 5B shows the relationship between the pressure and the flow rate in the emitter 120 according to the embodiment of the present invention.
  • the flow rates are significantly different between 20 ° C and 50 ° C. Specifically, at 50 ° C., the flow rate is too small as compared with 20 ° C., and the flow rate cannot be adjusted appropriately. It is considered that this is because the diaphragm portion 153 softens at a high temperature and deforms more due to the application of pressure, further blocking the communication hole 151 through which the irrigation liquid passes.
  • the emitter 120 according to the embodiment of the present invention is substantially the same when the pressure is about 0.5 bar and the flow rates are 20 ° C and 50 ° C, for example. .. This is because even if the diaphragm portion 153 softens and deforms more due to high temperature, the pedestal support portion 163 also softens and deforms, so that the flow rate of the irrigation liquid flowing between the diaphragm portion 153 and the pedestal 161 is adjusted. It is thought that this is because it is done.
  • the present invention it is possible to provide an emitter capable of appropriately adjusting the flow rate even if the hardness of the diaphragm portion changes due to a temperature change, and a drip irrigation tube having the emitter. Therefore, it is expected that the emitter and the drip irrigation tube having the emitter will be further spread.

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  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental Sciences (AREA)
  • Nozzles (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)

Abstract

La présente invention concerne la fourniture d'un goutteur qui permet à un débit d'être ajusté de manière appropriée même lorsque la dureté d'une partie de diaphragme change en raison d'un changement de température. Le goutteur comprend : une base ayant un trou traversant pour une communication avec un orifice d'évacuation pour évacuer un fluide d'irrigation ; une partie de diaphragme flexible qui se déforme vers la base lorsqu'elle est soumise à la pression du fluide d'irrigation dans un tube ; et une partie de support de base flexible qui supporte la base et qui se déforme de telle sorte que la base se déplace vers une surface de paroi interne du tube lorsque la partie de diaphragme presse la base. La partie de diaphragme et la partie de support de base se déforment plus facilement à des températures élevées qu'à des températures basses.
PCT/JP2020/031598 2019-08-29 2020-08-21 Goutteur et tuyau d'irrigation goutte à goutte Ceased WO2021039623A1 (fr)

Applications Claiming Priority (2)

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JP2019156783A JP2021029222A (ja) 2019-08-29 2019-08-29 エミッタおよび点滴灌漑用チューブ
JP2019-156783 2019-08-29

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WO2022180453A1 (fr) 2021-02-25 2022-09-01 Ricoh Company, Ltd. Appareil de traitement d'informations, système de traitement d'informations, procédé de traitement d'informations, et support d'enregistrement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050284966A1 (en) * 2004-06-23 2005-12-29 Defrank Michael Emitter
WO2015080126A1 (fr) * 2013-11-27 2015-06-04 株式会社エンプラス Emetteur et tube d'irrigation goutte-à-goutte

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050284966A1 (en) * 2004-06-23 2005-12-29 Defrank Michael Emitter
WO2015080126A1 (fr) * 2013-11-27 2015-06-04 株式会社エンプラス Emetteur et tube d'irrigation goutte-à-goutte

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